1 /* Output Dwarf2 format symbol table information from GCC.
2 Copyright (C) 1992, 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004 Free Software Foundation, Inc.
4 Contributed by Gary Funck (gary@intrepid.com).
5 Derived from DWARF 1 implementation of Ron Guilmette (rfg@monkeys.com).
6 Extensively modified by Jason Merrill (jason@cygnus.com).
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 2, or (at your option) any later
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING. If not, write to the Free
22 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 /* TODO: Emit .debug_line header even when there are no functions, since
26 the file numbers are used by .debug_info. Alternately, leave
27 out locations for types and decls.
28 Avoid talking about ctors and op= for PODs.
29 Factor out common prologue sequences into multiple CIEs. */
31 /* The first part of this file deals with the DWARF 2 frame unwind
32 information, which is also used by the GCC efficient exception handling
33 mechanism. The second part, controlled only by an #ifdef
34 DWARF2_DEBUGGING_INFO, deals with the other DWARF 2 debugging
39 #include "coretypes.h"
45 #include "hard-reg-set.h"
47 #include "insn-config.h"
55 #include "dwarf2out.h"
56 #include "dwarf2asm.h"
62 #include "diagnostic.h"
65 #include "langhooks.h"
70 #ifdef DWARF2_DEBUGGING_INFO
71 static void dwarf2out_source_line (unsigned int, const char *);
74 /* DWARF2 Abbreviation Glossary:
75 CFA = Canonical Frame Address
76 a fixed address on the stack which identifies a call frame.
77 We define it to be the value of SP just before the call insn.
78 The CFA register and offset, which may change during the course
79 of the function, are used to calculate its value at runtime.
80 CFI = Call Frame Instruction
81 an instruction for the DWARF2 abstract machine
82 CIE = Common Information Entry
83 information describing information common to one or more FDEs
84 DIE = Debugging Information Entry
85 FDE = Frame Description Entry
86 information describing the stack call frame, in particular,
87 how to restore registers
89 DW_CFA_... = DWARF2 CFA call frame instruction
90 DW_TAG_... = DWARF2 DIE tag */
92 /* Decide whether we want to emit frame unwind information for the current
96 dwarf2out_do_frame (void)
98 return (write_symbols == DWARF2_DEBUG
99 || write_symbols == VMS_AND_DWARF2_DEBUG
100 #ifdef DWARF2_FRAME_INFO
103 #ifdef DWARF2_UNWIND_INFO
104 || flag_unwind_tables
105 || (flag_exceptions && ! USING_SJLJ_EXCEPTIONS)
110 /* The size of the target's pointer type. */
112 #define PTR_SIZE (POINTER_SIZE / BITS_PER_UNIT)
115 /* Various versions of targetm.eh_frame_section. Note these must appear
116 outside the DWARF2_DEBUGGING_INFO || DWARF2_UNWIND_INFO macro guards. */
118 /* Version of targetm.eh_frame_section for systems with named sections. */
120 named_section_eh_frame_section (void)
122 #ifdef EH_FRAME_SECTION_NAME
123 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
124 int fde_encoding = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/1, /*global=*/0);
125 int per_encoding = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/2, /*global=*/1);
126 int lsda_encoding = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/0);
130 || ((fde_encoding & 0x70) != DW_EH_PE_absptr
131 && (fde_encoding & 0x70) != DW_EH_PE_aligned
132 && (per_encoding & 0x70) != DW_EH_PE_absptr
133 && (per_encoding & 0x70) != DW_EH_PE_aligned
134 && (lsda_encoding & 0x70) != DW_EH_PE_absptr
135 && (lsda_encoding & 0x70) != DW_EH_PE_aligned))
137 named_section_flags (EH_FRAME_SECTION_NAME, flags);
139 named_section_flags (EH_FRAME_SECTION_NAME, SECTION_WRITE);
144 /* Version of targetm.eh_frame_section for systems using collect2. */
146 collect2_eh_frame_section (void)
148 tree label = get_file_function_name ('F');
151 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (PTR_SIZE));
152 (*targetm.asm_out.globalize_label) (asm_out_file, IDENTIFIER_POINTER (label));
153 ASM_OUTPUT_LABEL (asm_out_file, IDENTIFIER_POINTER (label));
156 /* Default version of targetm.eh_frame_section. */
158 default_eh_frame_section (void)
160 #ifdef EH_FRAME_SECTION_NAME
161 named_section_eh_frame_section ();
163 collect2_eh_frame_section ();
167 /* Array of RTXes referenced by the debugging information, which therefore
168 must be kept around forever. */
169 static GTY(()) varray_type used_rtx_varray;
171 /* A pointer to the base of a list of incomplete types which might be
172 completed at some later time. incomplete_types_list needs to be a VARRAY
173 because we want to tell the garbage collector about it. */
174 static GTY(()) varray_type incomplete_types;
176 /* A pointer to the base of a table of references to declaration
177 scopes. This table is a display which tracks the nesting
178 of declaration scopes at the current scope and containing
179 scopes. This table is used to find the proper place to
180 define type declaration DIE's. */
181 static GTY(()) varray_type decl_scope_table;
183 /* How to start an assembler comment. */
184 #ifndef ASM_COMMENT_START
185 #define ASM_COMMENT_START ";#"
188 typedef struct dw_cfi_struct *dw_cfi_ref;
189 typedef struct dw_fde_struct *dw_fde_ref;
190 typedef union dw_cfi_oprnd_struct *dw_cfi_oprnd_ref;
192 /* Call frames are described using a sequence of Call Frame
193 Information instructions. The register number, offset
194 and address fields are provided as possible operands;
195 their use is selected by the opcode field. */
197 enum dw_cfi_oprnd_type {
199 dw_cfi_oprnd_reg_num,
205 typedef union dw_cfi_oprnd_struct GTY(())
207 unsigned long GTY ((tag ("dw_cfi_oprnd_reg_num"))) dw_cfi_reg_num;
208 HOST_WIDE_INT GTY ((tag ("dw_cfi_oprnd_offset"))) dw_cfi_offset;
209 const char * GTY ((tag ("dw_cfi_oprnd_addr"))) dw_cfi_addr;
210 struct dw_loc_descr_struct * GTY ((tag ("dw_cfi_oprnd_loc"))) dw_cfi_loc;
214 typedef struct dw_cfi_struct GTY(())
216 dw_cfi_ref dw_cfi_next;
217 enum dwarf_call_frame_info dw_cfi_opc;
218 dw_cfi_oprnd GTY ((desc ("dw_cfi_oprnd1_desc (%1.dw_cfi_opc)")))
220 dw_cfi_oprnd GTY ((desc ("dw_cfi_oprnd2_desc (%1.dw_cfi_opc)")))
225 /* This is how we define the location of the CFA. We use to handle it
226 as REG + OFFSET all the time, but now it can be more complex.
227 It can now be either REG + CFA_OFFSET or *(REG + BASE_OFFSET) + CFA_OFFSET.
228 Instead of passing around REG and OFFSET, we pass a copy
229 of this structure. */
230 typedef struct cfa_loc GTY(())
233 HOST_WIDE_INT offset;
234 HOST_WIDE_INT base_offset;
235 int indirect; /* 1 if CFA is accessed via a dereference. */
238 /* All call frame descriptions (FDE's) in the GCC generated DWARF
239 refer to a single Common Information Entry (CIE), defined at
240 the beginning of the .debug_frame section. This use of a single
241 CIE obviates the need to keep track of multiple CIE's
242 in the DWARF generation routines below. */
244 typedef struct dw_fde_struct GTY(())
247 const char *dw_fde_begin;
248 const char *dw_fde_current_label;
249 const char *dw_fde_end;
250 dw_cfi_ref dw_fde_cfi;
251 unsigned funcdef_number;
252 unsigned all_throwers_are_sibcalls : 1;
253 unsigned nothrow : 1;
254 unsigned uses_eh_lsda : 1;
258 /* Maximum size (in bytes) of an artificially generated label. */
259 #define MAX_ARTIFICIAL_LABEL_BYTES 30
261 /* The size of addresses as they appear in the Dwarf 2 data.
262 Some architectures use word addresses to refer to code locations,
263 but Dwarf 2 info always uses byte addresses. On such machines,
264 Dwarf 2 addresses need to be larger than the architecture's
266 #ifndef DWARF2_ADDR_SIZE
267 #define DWARF2_ADDR_SIZE (POINTER_SIZE / BITS_PER_UNIT)
270 /* The size in bytes of a DWARF field indicating an offset or length
271 relative to a debug info section, specified to be 4 bytes in the
272 DWARF-2 specification. The SGI/MIPS ABI defines it to be the same
275 #ifndef DWARF_OFFSET_SIZE
276 #define DWARF_OFFSET_SIZE 4
279 /* According to the (draft) DWARF 3 specification, the initial length
280 should either be 4 or 12 bytes. When it's 12 bytes, the first 4
281 bytes are 0xffffffff, followed by the length stored in the next 8
284 However, the SGI/MIPS ABI uses an initial length which is equal to
285 DWARF_OFFSET_SIZE. It is defined (elsewhere) accordingly. */
287 #ifndef DWARF_INITIAL_LENGTH_SIZE
288 #define DWARF_INITIAL_LENGTH_SIZE (DWARF_OFFSET_SIZE == 4 ? 4 : 12)
291 #define DWARF_VERSION 2
293 /* Round SIZE up to the nearest BOUNDARY. */
294 #define DWARF_ROUND(SIZE,BOUNDARY) \
295 ((((SIZE) + (BOUNDARY) - 1) / (BOUNDARY)) * (BOUNDARY))
297 /* Offsets recorded in opcodes are a multiple of this alignment factor. */
298 #ifndef DWARF_CIE_DATA_ALIGNMENT
299 #ifdef STACK_GROWS_DOWNWARD
300 #define DWARF_CIE_DATA_ALIGNMENT (-((int) UNITS_PER_WORD))
302 #define DWARF_CIE_DATA_ALIGNMENT ((int) UNITS_PER_WORD)
306 /* A pointer to the base of a table that contains frame description
307 information for each routine. */
308 static GTY((length ("fde_table_allocated"))) dw_fde_ref fde_table;
310 /* Number of elements currently allocated for fde_table. */
311 static GTY(()) unsigned fde_table_allocated;
313 /* Number of elements in fde_table currently in use. */
314 static GTY(()) unsigned fde_table_in_use;
316 /* Size (in elements) of increments by which we may expand the
318 #define FDE_TABLE_INCREMENT 256
320 /* A list of call frame insns for the CIE. */
321 static GTY(()) dw_cfi_ref cie_cfi_head;
323 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
324 /* Some DWARF extensions (e.g., MIPS/SGI) implement a subprogram
325 attribute that accelerates the lookup of the FDE associated
326 with the subprogram. This variable holds the table index of the FDE
327 associated with the current function (body) definition. */
328 static unsigned current_funcdef_fde;
331 struct indirect_string_node GTY(())
334 unsigned int refcount;
339 static GTY ((param_is (struct indirect_string_node))) htab_t debug_str_hash;
341 static GTY(()) int dw2_string_counter;
342 static GTY(()) unsigned long dwarf2out_cfi_label_num;
344 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
346 /* Forward declarations for functions defined in this file. */
348 static char *stripattributes (const char *);
349 static const char *dwarf_cfi_name (unsigned);
350 static dw_cfi_ref new_cfi (void);
351 static void add_cfi (dw_cfi_ref *, dw_cfi_ref);
352 static void add_fde_cfi (const char *, dw_cfi_ref);
353 static void lookup_cfa_1 (dw_cfi_ref, dw_cfa_location *);
354 static void lookup_cfa (dw_cfa_location *);
355 static void reg_save (const char *, unsigned, unsigned, HOST_WIDE_INT);
356 static void initial_return_save (rtx);
357 static HOST_WIDE_INT stack_adjust_offset (rtx);
358 static void output_cfi (dw_cfi_ref, dw_fde_ref, int);
359 static void output_call_frame_info (int);
360 static void dwarf2out_stack_adjust (rtx);
361 static void queue_reg_save (const char *, rtx, HOST_WIDE_INT);
362 static void flush_queued_reg_saves (void);
363 static bool clobbers_queued_reg_save (rtx);
364 static void dwarf2out_frame_debug_expr (rtx, const char *);
366 /* Support for complex CFA locations. */
367 static void output_cfa_loc (dw_cfi_ref);
368 static void get_cfa_from_loc_descr (dw_cfa_location *,
369 struct dw_loc_descr_struct *);
370 static struct dw_loc_descr_struct *build_cfa_loc
372 static void def_cfa_1 (const char *, dw_cfa_location *);
374 /* How to start an assembler comment. */
375 #ifndef ASM_COMMENT_START
376 #define ASM_COMMENT_START ";#"
379 /* Data and reference forms for relocatable data. */
380 #define DW_FORM_data (DWARF_OFFSET_SIZE == 8 ? DW_FORM_data8 : DW_FORM_data4)
381 #define DW_FORM_ref (DWARF_OFFSET_SIZE == 8 ? DW_FORM_ref8 : DW_FORM_ref4)
383 #ifndef DEBUG_FRAME_SECTION
384 #define DEBUG_FRAME_SECTION ".debug_frame"
387 #ifndef FUNC_BEGIN_LABEL
388 #define FUNC_BEGIN_LABEL "LFB"
391 #ifndef FUNC_END_LABEL
392 #define FUNC_END_LABEL "LFE"
395 #ifndef FRAME_BEGIN_LABEL
396 #define FRAME_BEGIN_LABEL "Lframe"
398 #define CIE_AFTER_SIZE_LABEL "LSCIE"
399 #define CIE_END_LABEL "LECIE"
400 #define FDE_LABEL "LSFDE"
401 #define FDE_AFTER_SIZE_LABEL "LASFDE"
402 #define FDE_END_LABEL "LEFDE"
403 #define LINE_NUMBER_BEGIN_LABEL "LSLT"
404 #define LINE_NUMBER_END_LABEL "LELT"
405 #define LN_PROLOG_AS_LABEL "LASLTP"
406 #define LN_PROLOG_END_LABEL "LELTP"
407 #define DIE_LABEL_PREFIX "DW"
409 /* The DWARF 2 CFA column which tracks the return address. Normally this
410 is the column for PC, or the first column after all of the hard
412 #ifndef DWARF_FRAME_RETURN_COLUMN
414 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (PC_REGNUM)
416 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGISTERS
420 /* The mapping from gcc register number to DWARF 2 CFA column number. By
421 default, we just provide columns for all registers. */
422 #ifndef DWARF_FRAME_REGNUM
423 #define DWARF_FRAME_REGNUM(REG) DBX_REGISTER_NUMBER (REG)
426 /* The offset from the incoming value of %sp to the top of the stack frame
427 for the current function. */
428 #ifndef INCOMING_FRAME_SP_OFFSET
429 #define INCOMING_FRAME_SP_OFFSET 0
432 /* Hook used by __throw. */
435 expand_builtin_dwarf_sp_column (void)
437 return GEN_INT (DWARF_FRAME_REGNUM (STACK_POINTER_REGNUM));
440 /* Return a pointer to a copy of the section string name S with all
441 attributes stripped off, and an asterisk prepended (for assemble_name). */
444 stripattributes (const char *s)
446 char *stripped = xmalloc (strlen (s) + 2);
451 while (*s && *s != ',')
458 /* Generate code to initialize the register size table. */
461 expand_builtin_init_dwarf_reg_sizes (tree address)
464 enum machine_mode mode = TYPE_MODE (char_type_node);
465 rtx addr = expand_expr (address, NULL_RTX, VOIDmode, 0);
466 rtx mem = gen_rtx_MEM (BLKmode, addr);
467 bool wrote_return_column = false;
469 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
470 if (DWARF_FRAME_REGNUM (i) < DWARF_FRAME_REGISTERS)
472 HOST_WIDE_INT offset = DWARF_FRAME_REGNUM (i) * GET_MODE_SIZE (mode);
473 enum machine_mode save_mode = reg_raw_mode[i];
476 if (HARD_REGNO_CALL_PART_CLOBBERED (i, save_mode))
477 save_mode = choose_hard_reg_mode (i, 1, true);
478 if (DWARF_FRAME_REGNUM (i) == DWARF_FRAME_RETURN_COLUMN)
480 if (save_mode == VOIDmode)
482 wrote_return_column = true;
484 size = GET_MODE_SIZE (save_mode);
488 emit_move_insn (adjust_address (mem, mode, offset), GEN_INT (size));
491 #ifdef DWARF_ALT_FRAME_RETURN_COLUMN
492 if (! wrote_return_column)
494 i = DWARF_ALT_FRAME_RETURN_COLUMN;
495 wrote_return_column = false;
497 i = DWARF_FRAME_RETURN_COLUMN;
500 if (! wrote_return_column)
502 enum machine_mode save_mode = Pmode;
503 HOST_WIDE_INT offset = i * GET_MODE_SIZE (mode);
504 HOST_WIDE_INT size = GET_MODE_SIZE (save_mode);
505 emit_move_insn (adjust_address (mem, mode, offset), GEN_INT (size));
509 /* Convert a DWARF call frame info. operation to its string name */
512 dwarf_cfi_name (unsigned int cfi_opc)
516 case DW_CFA_advance_loc:
517 return "DW_CFA_advance_loc";
519 return "DW_CFA_offset";
521 return "DW_CFA_restore";
525 return "DW_CFA_set_loc";
526 case DW_CFA_advance_loc1:
527 return "DW_CFA_advance_loc1";
528 case DW_CFA_advance_loc2:
529 return "DW_CFA_advance_loc2";
530 case DW_CFA_advance_loc4:
531 return "DW_CFA_advance_loc4";
532 case DW_CFA_offset_extended:
533 return "DW_CFA_offset_extended";
534 case DW_CFA_restore_extended:
535 return "DW_CFA_restore_extended";
536 case DW_CFA_undefined:
537 return "DW_CFA_undefined";
538 case DW_CFA_same_value:
539 return "DW_CFA_same_value";
540 case DW_CFA_register:
541 return "DW_CFA_register";
542 case DW_CFA_remember_state:
543 return "DW_CFA_remember_state";
544 case DW_CFA_restore_state:
545 return "DW_CFA_restore_state";
547 return "DW_CFA_def_cfa";
548 case DW_CFA_def_cfa_register:
549 return "DW_CFA_def_cfa_register";
550 case DW_CFA_def_cfa_offset:
551 return "DW_CFA_def_cfa_offset";
554 case DW_CFA_def_cfa_expression:
555 return "DW_CFA_def_cfa_expression";
556 case DW_CFA_expression:
557 return "DW_CFA_expression";
558 case DW_CFA_offset_extended_sf:
559 return "DW_CFA_offset_extended_sf";
560 case DW_CFA_def_cfa_sf:
561 return "DW_CFA_def_cfa_sf";
562 case DW_CFA_def_cfa_offset_sf:
563 return "DW_CFA_def_cfa_offset_sf";
565 /* SGI/MIPS specific */
566 case DW_CFA_MIPS_advance_loc8:
567 return "DW_CFA_MIPS_advance_loc8";
570 case DW_CFA_GNU_window_save:
571 return "DW_CFA_GNU_window_save";
572 case DW_CFA_GNU_args_size:
573 return "DW_CFA_GNU_args_size";
574 case DW_CFA_GNU_negative_offset_extended:
575 return "DW_CFA_GNU_negative_offset_extended";
578 return "DW_CFA_<unknown>";
582 /* Return a pointer to a newly allocated Call Frame Instruction. */
584 static inline dw_cfi_ref
587 dw_cfi_ref cfi = ggc_alloc (sizeof (dw_cfi_node));
589 cfi->dw_cfi_next = NULL;
590 cfi->dw_cfi_oprnd1.dw_cfi_reg_num = 0;
591 cfi->dw_cfi_oprnd2.dw_cfi_reg_num = 0;
596 /* Add a Call Frame Instruction to list of instructions. */
599 add_cfi (dw_cfi_ref *list_head, dw_cfi_ref cfi)
603 /* Find the end of the chain. */
604 for (p = list_head; (*p) != NULL; p = &(*p)->dw_cfi_next)
610 /* Generate a new label for the CFI info to refer to. */
613 dwarf2out_cfi_label (void)
615 static char label[20];
617 ASM_GENERATE_INTERNAL_LABEL (label, "LCFI", dwarf2out_cfi_label_num++);
618 ASM_OUTPUT_LABEL (asm_out_file, label);
622 /* Add CFI to the current fde at the PC value indicated by LABEL if specified,
623 or to the CIE if LABEL is NULL. */
626 add_fde_cfi (const char *label, dw_cfi_ref cfi)
630 dw_fde_ref fde = &fde_table[fde_table_in_use - 1];
633 label = dwarf2out_cfi_label ();
635 if (fde->dw_fde_current_label == NULL
636 || strcmp (label, fde->dw_fde_current_label) != 0)
640 fde->dw_fde_current_label = label = xstrdup (label);
642 /* Set the location counter to the new label. */
644 xcfi->dw_cfi_opc = DW_CFA_advance_loc4;
645 xcfi->dw_cfi_oprnd1.dw_cfi_addr = label;
646 add_cfi (&fde->dw_fde_cfi, xcfi);
649 add_cfi (&fde->dw_fde_cfi, cfi);
653 add_cfi (&cie_cfi_head, cfi);
656 /* Subroutine of lookup_cfa. */
659 lookup_cfa_1 (dw_cfi_ref cfi, dw_cfa_location *loc)
661 switch (cfi->dw_cfi_opc)
663 case DW_CFA_def_cfa_offset:
664 loc->offset = cfi->dw_cfi_oprnd1.dw_cfi_offset;
666 case DW_CFA_def_cfa_register:
667 loc->reg = cfi->dw_cfi_oprnd1.dw_cfi_reg_num;
670 loc->reg = cfi->dw_cfi_oprnd1.dw_cfi_reg_num;
671 loc->offset = cfi->dw_cfi_oprnd2.dw_cfi_offset;
673 case DW_CFA_def_cfa_expression:
674 get_cfa_from_loc_descr (loc, cfi->dw_cfi_oprnd1.dw_cfi_loc);
681 /* Find the previous value for the CFA. */
684 lookup_cfa (dw_cfa_location *loc)
688 loc->reg = (unsigned long) -1;
691 loc->base_offset = 0;
693 for (cfi = cie_cfi_head; cfi; cfi = cfi->dw_cfi_next)
694 lookup_cfa_1 (cfi, loc);
696 if (fde_table_in_use)
698 dw_fde_ref fde = &fde_table[fde_table_in_use - 1];
699 for (cfi = fde->dw_fde_cfi; cfi; cfi = cfi->dw_cfi_next)
700 lookup_cfa_1 (cfi, loc);
704 /* The current rule for calculating the DWARF2 canonical frame address. */
705 static dw_cfa_location cfa;
707 /* The register used for saving registers to the stack, and its offset
709 static dw_cfa_location cfa_store;
711 /* The running total of the size of arguments pushed onto the stack. */
712 static HOST_WIDE_INT args_size;
714 /* The last args_size we actually output. */
715 static HOST_WIDE_INT old_args_size;
717 /* Entry point to update the canonical frame address (CFA).
718 LABEL is passed to add_fde_cfi. The value of CFA is now to be
719 calculated from REG+OFFSET. */
722 dwarf2out_def_cfa (const char *label, unsigned int reg, HOST_WIDE_INT offset)
729 def_cfa_1 (label, &loc);
732 /* This routine does the actual work. The CFA is now calculated from
733 the dw_cfa_location structure. */
736 def_cfa_1 (const char *label, dw_cfa_location *loc_p)
739 dw_cfa_location old_cfa, loc;
744 if (cfa_store.reg == loc.reg && loc.indirect == 0)
745 cfa_store.offset = loc.offset;
747 loc.reg = DWARF_FRAME_REGNUM (loc.reg);
748 lookup_cfa (&old_cfa);
750 /* If nothing changed, no need to issue any call frame instructions. */
751 if (loc.reg == old_cfa.reg && loc.offset == old_cfa.offset
752 && loc.indirect == old_cfa.indirect
753 && (loc.indirect == 0 || loc.base_offset == old_cfa.base_offset))
758 if (loc.reg == old_cfa.reg && !loc.indirect)
760 /* Construct a "DW_CFA_def_cfa_offset <offset>" instruction,
761 indicating the CFA register did not change but the offset
763 cfi->dw_cfi_opc = DW_CFA_def_cfa_offset;
764 cfi->dw_cfi_oprnd1.dw_cfi_offset = loc.offset;
767 #ifndef MIPS_DEBUGGING_INFO /* SGI dbx thinks this means no offset. */
768 else if (loc.offset == old_cfa.offset && old_cfa.reg != (unsigned long) -1
771 /* Construct a "DW_CFA_def_cfa_register <register>" instruction,
772 indicating the CFA register has changed to <register> but the
773 offset has not changed. */
774 cfi->dw_cfi_opc = DW_CFA_def_cfa_register;
775 cfi->dw_cfi_oprnd1.dw_cfi_reg_num = loc.reg;
779 else if (loc.indirect == 0)
781 /* Construct a "DW_CFA_def_cfa <register> <offset>" instruction,
782 indicating the CFA register has changed to <register> with
783 the specified offset. */
784 cfi->dw_cfi_opc = DW_CFA_def_cfa;
785 cfi->dw_cfi_oprnd1.dw_cfi_reg_num = loc.reg;
786 cfi->dw_cfi_oprnd2.dw_cfi_offset = loc.offset;
790 /* Construct a DW_CFA_def_cfa_expression instruction to
791 calculate the CFA using a full location expression since no
792 register-offset pair is available. */
793 struct dw_loc_descr_struct *loc_list;
795 cfi->dw_cfi_opc = DW_CFA_def_cfa_expression;
796 loc_list = build_cfa_loc (&loc);
797 cfi->dw_cfi_oprnd1.dw_cfi_loc = loc_list;
800 add_fde_cfi (label, cfi);
803 /* Add the CFI for saving a register. REG is the CFA column number.
804 LABEL is passed to add_fde_cfi.
805 If SREG is -1, the register is saved at OFFSET from the CFA;
806 otherwise it is saved in SREG. */
809 reg_save (const char *label, unsigned int reg, unsigned int sreg, HOST_WIDE_INT offset)
811 dw_cfi_ref cfi = new_cfi ();
813 cfi->dw_cfi_oprnd1.dw_cfi_reg_num = reg;
815 /* The following comparison is correct. -1 is used to indicate that
816 the value isn't a register number. */
817 if (sreg == (unsigned int) -1)
820 /* The register number won't fit in 6 bits, so we have to use
822 cfi->dw_cfi_opc = DW_CFA_offset_extended;
824 cfi->dw_cfi_opc = DW_CFA_offset;
826 #ifdef ENABLE_CHECKING
828 /* If we get an offset that is not a multiple of
829 DWARF_CIE_DATA_ALIGNMENT, there is either a bug in the
830 definition of DWARF_CIE_DATA_ALIGNMENT, or a bug in the machine
832 HOST_WIDE_INT check_offset = offset / DWARF_CIE_DATA_ALIGNMENT;
834 if (check_offset * DWARF_CIE_DATA_ALIGNMENT != offset)
838 offset /= DWARF_CIE_DATA_ALIGNMENT;
840 cfi->dw_cfi_opc = DW_CFA_offset_extended_sf;
842 cfi->dw_cfi_oprnd2.dw_cfi_offset = offset;
844 else if (sreg == reg)
845 /* We could emit a DW_CFA_same_value in this case, but don't bother. */
849 cfi->dw_cfi_opc = DW_CFA_register;
850 cfi->dw_cfi_oprnd2.dw_cfi_reg_num = sreg;
853 add_fde_cfi (label, cfi);
856 /* Add the CFI for saving a register window. LABEL is passed to reg_save.
857 This CFI tells the unwinder that it needs to restore the window registers
858 from the previous frame's window save area.
860 ??? Perhaps we should note in the CIE where windows are saved (instead of
861 assuming 0(cfa)) and what registers are in the window. */
864 dwarf2out_window_save (const char *label)
866 dw_cfi_ref cfi = new_cfi ();
868 cfi->dw_cfi_opc = DW_CFA_GNU_window_save;
869 add_fde_cfi (label, cfi);
872 /* Add a CFI to update the running total of the size of arguments
873 pushed onto the stack. */
876 dwarf2out_args_size (const char *label, HOST_WIDE_INT size)
880 if (size == old_args_size)
883 old_args_size = size;
886 cfi->dw_cfi_opc = DW_CFA_GNU_args_size;
887 cfi->dw_cfi_oprnd1.dw_cfi_offset = size;
888 add_fde_cfi (label, cfi);
891 /* Entry point for saving a register to the stack. REG is the GCC register
892 number. LABEL and OFFSET are passed to reg_save. */
895 dwarf2out_reg_save (const char *label, unsigned int reg, HOST_WIDE_INT offset)
897 reg_save (label, DWARF_FRAME_REGNUM (reg), -1, offset);
900 /* Entry point for saving the return address in the stack.
901 LABEL and OFFSET are passed to reg_save. */
904 dwarf2out_return_save (const char *label, HOST_WIDE_INT offset)
906 reg_save (label, DWARF_FRAME_RETURN_COLUMN, -1, offset);
909 /* Entry point for saving the return address in a register.
910 LABEL and SREG are passed to reg_save. */
913 dwarf2out_return_reg (const char *label, unsigned int sreg)
915 reg_save (label, DWARF_FRAME_RETURN_COLUMN, sreg, 0);
918 /* Record the initial position of the return address. RTL is
919 INCOMING_RETURN_ADDR_RTX. */
922 initial_return_save (rtx rtl)
924 unsigned int reg = (unsigned int) -1;
925 HOST_WIDE_INT offset = 0;
927 switch (GET_CODE (rtl))
930 /* RA is in a register. */
931 reg = DWARF_FRAME_REGNUM (REGNO (rtl));
935 /* RA is on the stack. */
937 switch (GET_CODE (rtl))
940 if (REGNO (rtl) != STACK_POINTER_REGNUM)
946 if (REGNO (XEXP (rtl, 0)) != STACK_POINTER_REGNUM)
948 offset = INTVAL (XEXP (rtl, 1));
952 if (REGNO (XEXP (rtl, 0)) != STACK_POINTER_REGNUM)
954 offset = -INTVAL (XEXP (rtl, 1));
964 /* The return address is at some offset from any value we can
965 actually load. For instance, on the SPARC it is in %i7+8. Just
966 ignore the offset for now; it doesn't matter for unwinding frames. */
967 if (GET_CODE (XEXP (rtl, 1)) != CONST_INT)
969 initial_return_save (XEXP (rtl, 0));
976 reg_save (NULL, DWARF_FRAME_RETURN_COLUMN, reg, offset - cfa.offset);
979 /* Given a SET, calculate the amount of stack adjustment it
983 stack_adjust_offset (rtx pattern)
985 rtx src = SET_SRC (pattern);
986 rtx dest = SET_DEST (pattern);
987 HOST_WIDE_INT offset = 0;
990 if (dest == stack_pointer_rtx)
992 /* (set (reg sp) (plus (reg sp) (const_int))) */
993 code = GET_CODE (src);
994 if (! (code == PLUS || code == MINUS)
995 || XEXP (src, 0) != stack_pointer_rtx
996 || GET_CODE (XEXP (src, 1)) != CONST_INT)
999 offset = INTVAL (XEXP (src, 1));
1003 else if (GET_CODE (dest) == MEM)
1005 /* (set (mem (pre_dec (reg sp))) (foo)) */
1006 src = XEXP (dest, 0);
1007 code = GET_CODE (src);
1013 if (XEXP (src, 0) == stack_pointer_rtx)
1015 rtx val = XEXP (XEXP (src, 1), 1);
1016 /* We handle only adjustments by constant amount. */
1017 if (GET_CODE (XEXP (src, 1)) != PLUS ||
1018 GET_CODE (val) != CONST_INT)
1020 offset = -INTVAL (val);
1027 if (XEXP (src, 0) == stack_pointer_rtx)
1029 offset = GET_MODE_SIZE (GET_MODE (dest));
1036 if (XEXP (src, 0) == stack_pointer_rtx)
1038 offset = -GET_MODE_SIZE (GET_MODE (dest));
1053 /* Check INSN to see if it looks like a push or a stack adjustment, and
1054 make a note of it if it does. EH uses this information to find out how
1055 much extra space it needs to pop off the stack. */
1058 dwarf2out_stack_adjust (rtx insn)
1060 HOST_WIDE_INT offset;
1064 /* Don't handle epilogues at all. Certainly it would be wrong to do so
1065 with this function. Proper support would require all frame-related
1066 insns to be marked, and to be able to handle saving state around
1067 epilogues textually in the middle of the function. */
1068 if (prologue_epilogue_contains (insn) || sibcall_epilogue_contains (insn))
1071 if (!flag_asynchronous_unwind_tables && GET_CODE (insn) == CALL_INSN)
1073 /* Extract the size of the args from the CALL rtx itself. */
1074 insn = PATTERN (insn);
1075 if (GET_CODE (insn) == PARALLEL)
1076 insn = XVECEXP (insn, 0, 0);
1077 if (GET_CODE (insn) == SET)
1078 insn = SET_SRC (insn);
1079 if (GET_CODE (insn) != CALL)
1082 dwarf2out_args_size ("", INTVAL (XEXP (insn, 1)));
1086 /* If only calls can throw, and we have a frame pointer,
1087 save up adjustments until we see the CALL_INSN. */
1088 else if (!flag_asynchronous_unwind_tables && cfa.reg != STACK_POINTER_REGNUM)
1091 if (GET_CODE (insn) == BARRIER)
1093 /* When we see a BARRIER, we know to reset args_size to 0. Usually
1094 the compiler will have already emitted a stack adjustment, but
1095 doesn't bother for calls to noreturn functions. */
1096 #ifdef STACK_GROWS_DOWNWARD
1097 offset = -args_size;
1102 else if (GET_CODE (PATTERN (insn)) == SET)
1103 offset = stack_adjust_offset (PATTERN (insn));
1104 else if (GET_CODE (PATTERN (insn)) == PARALLEL
1105 || GET_CODE (PATTERN (insn)) == SEQUENCE)
1107 /* There may be stack adjustments inside compound insns. Search
1109 for (offset = 0, i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--)
1110 if (GET_CODE (XVECEXP (PATTERN (insn), 0, i)) == SET)
1111 offset += stack_adjust_offset (XVECEXP (PATTERN (insn), 0, i));
1119 if (cfa.reg == STACK_POINTER_REGNUM)
1120 cfa.offset += offset;
1122 #ifndef STACK_GROWS_DOWNWARD
1126 args_size += offset;
1130 label = dwarf2out_cfi_label ();
1131 def_cfa_1 (label, &cfa);
1132 dwarf2out_args_size (label, args_size);
1137 /* We delay emitting a register save until either (a) we reach the end
1138 of the prologue or (b) the register is clobbered. This clusters
1139 register saves so that there are fewer pc advances. */
1141 struct queued_reg_save GTY(())
1143 struct queued_reg_save *next;
1145 HOST_WIDE_INT cfa_offset;
1148 static GTY(()) struct queued_reg_save *queued_reg_saves;
1150 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
1151 static const char *last_reg_save_label;
1154 queue_reg_save (const char *label, rtx reg, HOST_WIDE_INT offset)
1156 struct queued_reg_save *q = ggc_alloc (sizeof (*q));
1158 q->next = queued_reg_saves;
1160 q->cfa_offset = offset;
1161 queued_reg_saves = q;
1163 last_reg_save_label = label;
1167 flush_queued_reg_saves (void)
1169 struct queued_reg_save *q, *next;
1171 for (q = queued_reg_saves; q; q = next)
1173 dwarf2out_reg_save (last_reg_save_label, REGNO (q->reg), q->cfa_offset);
1177 queued_reg_saves = NULL;
1178 last_reg_save_label = NULL;
1182 clobbers_queued_reg_save (rtx insn)
1184 struct queued_reg_save *q;
1186 for (q = queued_reg_saves; q; q = q->next)
1187 if (modified_in_p (q->reg, insn))
1194 /* A temporary register holding an integral value used in adjusting SP
1195 or setting up the store_reg. The "offset" field holds the integer
1196 value, not an offset. */
1197 static dw_cfa_location cfa_temp;
1199 /* Record call frame debugging information for an expression EXPR,
1200 which either sets SP or FP (adjusting how we calculate the frame
1201 address) or saves a register to the stack. LABEL indicates the
1204 This function encodes a state machine mapping rtxes to actions on
1205 cfa, cfa_store, and cfa_temp.reg. We describe these rules so
1206 users need not read the source code.
1208 The High-Level Picture
1210 Changes in the register we use to calculate the CFA: Currently we
1211 assume that if you copy the CFA register into another register, we
1212 should take the other one as the new CFA register; this seems to
1213 work pretty well. If it's wrong for some target, it's simple
1214 enough not to set RTX_FRAME_RELATED_P on the insn in question.
1216 Changes in the register we use for saving registers to the stack:
1217 This is usually SP, but not always. Again, we deduce that if you
1218 copy SP into another register (and SP is not the CFA register),
1219 then the new register is the one we will be using for register
1220 saves. This also seems to work.
1222 Register saves: There's not much guesswork about this one; if
1223 RTX_FRAME_RELATED_P is set on an insn which modifies memory, it's a
1224 register save, and the register used to calculate the destination
1225 had better be the one we think we're using for this purpose.
1227 Except: If the register being saved is the CFA register, and the
1228 offset is nonzero, we are saving the CFA, so we assume we have to
1229 use DW_CFA_def_cfa_expression. If the offset is 0, we assume that
1230 the intent is to save the value of SP from the previous frame.
1232 Invariants / Summaries of Rules
1234 cfa current rule for calculating the CFA. It usually
1235 consists of a register and an offset.
1236 cfa_store register used by prologue code to save things to the stack
1237 cfa_store.offset is the offset from the value of
1238 cfa_store.reg to the actual CFA
1239 cfa_temp register holding an integral value. cfa_temp.offset
1240 stores the value, which will be used to adjust the
1241 stack pointer. cfa_temp is also used like cfa_store,
1242 to track stores to the stack via fp or a temp reg.
1244 Rules 1- 4: Setting a register's value to cfa.reg or an expression
1245 with cfa.reg as the first operand changes the cfa.reg and its
1246 cfa.offset. Rule 1 and 4 also set cfa_temp.reg and
1249 Rules 6- 9: Set a non-cfa.reg register value to a constant or an
1250 expression yielding a constant. This sets cfa_temp.reg
1251 and cfa_temp.offset.
1253 Rule 5: Create a new register cfa_store used to save items to the
1256 Rules 10-14: Save a register to the stack. Define offset as the
1257 difference of the original location and cfa_store's
1258 location (or cfa_temp's location if cfa_temp is used).
1262 "{a,b}" indicates a choice of a xor b.
1263 "<reg>:cfa.reg" indicates that <reg> must equal cfa.reg.
1266 (set <reg1> <reg2>:cfa.reg)
1267 effects: cfa.reg = <reg1>
1268 cfa.offset unchanged
1269 cfa_temp.reg = <reg1>
1270 cfa_temp.offset = cfa.offset
1273 (set sp ({minus,plus,losum} {sp,fp}:cfa.reg
1274 {<const_int>,<reg>:cfa_temp.reg}))
1275 effects: cfa.reg = sp if fp used
1276 cfa.offset += {+/- <const_int>, cfa_temp.offset} if cfa.reg==sp
1277 cfa_store.offset += {+/- <const_int>, cfa_temp.offset}
1278 if cfa_store.reg==sp
1281 (set fp ({minus,plus,losum} <reg>:cfa.reg <const_int>))
1282 effects: cfa.reg = fp
1283 cfa_offset += +/- <const_int>
1286 (set <reg1> ({plus,losum} <reg2>:cfa.reg <const_int>))
1287 constraints: <reg1> != fp
1289 effects: cfa.reg = <reg1>
1290 cfa_temp.reg = <reg1>
1291 cfa_temp.offset = cfa.offset
1294 (set <reg1> (plus <reg2>:cfa_temp.reg sp:cfa.reg))
1295 constraints: <reg1> != fp
1297 effects: cfa_store.reg = <reg1>
1298 cfa_store.offset = cfa.offset - cfa_temp.offset
1301 (set <reg> <const_int>)
1302 effects: cfa_temp.reg = <reg>
1303 cfa_temp.offset = <const_int>
1306 (set <reg1>:cfa_temp.reg (ior <reg2>:cfa_temp.reg <const_int>))
1307 effects: cfa_temp.reg = <reg1>
1308 cfa_temp.offset |= <const_int>
1311 (set <reg> (high <exp>))
1315 (set <reg> (lo_sum <exp> <const_int>))
1316 effects: cfa_temp.reg = <reg>
1317 cfa_temp.offset = <const_int>
1320 (set (mem (pre_modify sp:cfa_store (???? <reg1> <const_int>))) <reg2>)
1321 effects: cfa_store.offset -= <const_int>
1322 cfa.offset = cfa_store.offset if cfa.reg == sp
1324 cfa.base_offset = -cfa_store.offset
1327 (set (mem ({pre_inc,pre_dec} sp:cfa_store.reg)) <reg>)
1328 effects: cfa_store.offset += -/+ mode_size(mem)
1329 cfa.offset = cfa_store.offset if cfa.reg == sp
1331 cfa.base_offset = -cfa_store.offset
1334 (set (mem ({minus,plus,losum} <reg1>:{cfa_store,cfa_temp} <const_int>))
1337 effects: cfa.reg = <reg1>
1338 cfa.base_offset = -/+ <const_int> - {cfa_store,cfa_temp}.offset
1341 (set (mem <reg1>:{cfa_store,cfa_temp}) <reg2>)
1342 effects: cfa.reg = <reg1>
1343 cfa.base_offset = -{cfa_store,cfa_temp}.offset
1346 (set (mem (postinc <reg1>:cfa_temp <const_int>)) <reg2>)
1347 effects: cfa.reg = <reg1>
1348 cfa.base_offset = -cfa_temp.offset
1349 cfa_temp.offset -= mode_size(mem) */
1352 dwarf2out_frame_debug_expr (rtx expr, const char *label)
1355 HOST_WIDE_INT offset;
1357 /* If RTX_FRAME_RELATED_P is set on a PARALLEL, process each member of
1358 the PARALLEL independently. The first element is always processed if
1359 it is a SET. This is for backward compatibility. Other elements
1360 are processed only if they are SETs and the RTX_FRAME_RELATED_P
1361 flag is set in them. */
1362 if (GET_CODE (expr) == PARALLEL || GET_CODE (expr) == SEQUENCE)
1365 int limit = XVECLEN (expr, 0);
1367 for (par_index = 0; par_index < limit; par_index++)
1368 if (GET_CODE (XVECEXP (expr, 0, par_index)) == SET
1369 && (RTX_FRAME_RELATED_P (XVECEXP (expr, 0, par_index))
1371 dwarf2out_frame_debug_expr (XVECEXP (expr, 0, par_index), label);
1376 if (GET_CODE (expr) != SET)
1379 src = SET_SRC (expr);
1380 dest = SET_DEST (expr);
1382 switch (GET_CODE (dest))
1386 /* Update the CFA rule wrt SP or FP. Make sure src is
1387 relative to the current CFA register. */
1388 switch (GET_CODE (src))
1390 /* Setting FP from SP. */
1392 if (cfa.reg == (unsigned) REGNO (src))
1398 /* We used to require that dest be either SP or FP, but the
1399 ARM copies SP to a temporary register, and from there to
1400 FP. So we just rely on the backends to only set
1401 RTX_FRAME_RELATED_P on appropriate insns. */
1402 cfa.reg = REGNO (dest);
1403 cfa_temp.reg = cfa.reg;
1404 cfa_temp.offset = cfa.offset;
1410 if (dest == stack_pointer_rtx)
1414 switch (GET_CODE (XEXP (src, 1)))
1417 offset = INTVAL (XEXP (src, 1));
1420 if ((unsigned) REGNO (XEXP (src, 1)) != cfa_temp.reg)
1422 offset = cfa_temp.offset;
1428 if (XEXP (src, 0) == hard_frame_pointer_rtx)
1430 /* Restoring SP from FP in the epilogue. */
1431 if (cfa.reg != (unsigned) HARD_FRAME_POINTER_REGNUM)
1433 cfa.reg = STACK_POINTER_REGNUM;
1435 else if (GET_CODE (src) == LO_SUM)
1436 /* Assume we've set the source reg of the LO_SUM from sp. */
1438 else if (XEXP (src, 0) != stack_pointer_rtx)
1441 if (GET_CODE (src) != MINUS)
1443 if (cfa.reg == STACK_POINTER_REGNUM)
1444 cfa.offset += offset;
1445 if (cfa_store.reg == STACK_POINTER_REGNUM)
1446 cfa_store.offset += offset;
1448 else if (dest == hard_frame_pointer_rtx)
1451 /* Either setting the FP from an offset of the SP,
1452 or adjusting the FP */
1453 if (! frame_pointer_needed)
1456 if (GET_CODE (XEXP (src, 0)) == REG
1457 && (unsigned) REGNO (XEXP (src, 0)) == cfa.reg
1458 && GET_CODE (XEXP (src, 1)) == CONST_INT)
1460 offset = INTVAL (XEXP (src, 1));
1461 if (GET_CODE (src) != MINUS)
1463 cfa.offset += offset;
1464 cfa.reg = HARD_FRAME_POINTER_REGNUM;
1471 if (GET_CODE (src) == MINUS)
1475 if (GET_CODE (XEXP (src, 0)) == REG
1476 && REGNO (XEXP (src, 0)) == cfa.reg
1477 && GET_CODE (XEXP (src, 1)) == CONST_INT)
1479 /* Setting a temporary CFA register that will be copied
1480 into the FP later on. */
1481 offset = - INTVAL (XEXP (src, 1));
1482 cfa.offset += offset;
1483 cfa.reg = REGNO (dest);
1484 /* Or used to save regs to the stack. */
1485 cfa_temp.reg = cfa.reg;
1486 cfa_temp.offset = cfa.offset;
1490 else if (GET_CODE (XEXP (src, 0)) == REG
1491 && REGNO (XEXP (src, 0)) == cfa_temp.reg
1492 && XEXP (src, 1) == stack_pointer_rtx)
1494 /* Setting a scratch register that we will use instead
1495 of SP for saving registers to the stack. */
1496 if (cfa.reg != STACK_POINTER_REGNUM)
1498 cfa_store.reg = REGNO (dest);
1499 cfa_store.offset = cfa.offset - cfa_temp.offset;
1503 else if (GET_CODE (src) == LO_SUM
1504 && GET_CODE (XEXP (src, 1)) == CONST_INT)
1506 cfa_temp.reg = REGNO (dest);
1507 cfa_temp.offset = INTVAL (XEXP (src, 1));
1516 cfa_temp.reg = REGNO (dest);
1517 cfa_temp.offset = INTVAL (src);
1522 if (GET_CODE (XEXP (src, 0)) != REG
1523 || (unsigned) REGNO (XEXP (src, 0)) != cfa_temp.reg
1524 || GET_CODE (XEXP (src, 1)) != CONST_INT)
1527 if ((unsigned) REGNO (dest) != cfa_temp.reg)
1528 cfa_temp.reg = REGNO (dest);
1529 cfa_temp.offset |= INTVAL (XEXP (src, 1));
1532 /* Skip over HIGH, assuming it will be followed by a LO_SUM,
1533 which will fill in all of the bits. */
1542 def_cfa_1 (label, &cfa);
1546 if (GET_CODE (src) != REG)
1549 /* Saving a register to the stack. Make sure dest is relative to the
1551 switch (GET_CODE (XEXP (dest, 0)))
1556 /* We can't handle variable size modifications. */
1557 if (GET_CODE (XEXP (XEXP (XEXP (dest, 0), 1), 1)) != CONST_INT)
1559 offset = -INTVAL (XEXP (XEXP (XEXP (dest, 0), 1), 1));
1561 if (REGNO (XEXP (XEXP (dest, 0), 0)) != STACK_POINTER_REGNUM
1562 || cfa_store.reg != STACK_POINTER_REGNUM)
1565 cfa_store.offset += offset;
1566 if (cfa.reg == STACK_POINTER_REGNUM)
1567 cfa.offset = cfa_store.offset;
1569 offset = -cfa_store.offset;
1575 offset = GET_MODE_SIZE (GET_MODE (dest));
1576 if (GET_CODE (XEXP (dest, 0)) == PRE_INC)
1579 if (REGNO (XEXP (XEXP (dest, 0), 0)) != STACK_POINTER_REGNUM
1580 || cfa_store.reg != STACK_POINTER_REGNUM)
1583 cfa_store.offset += offset;
1584 if (cfa.reg == STACK_POINTER_REGNUM)
1585 cfa.offset = cfa_store.offset;
1587 offset = -cfa_store.offset;
1591 /* With an offset. */
1595 if (GET_CODE (XEXP (XEXP (dest, 0), 1)) != CONST_INT)
1597 offset = INTVAL (XEXP (XEXP (dest, 0), 1));
1598 if (GET_CODE (XEXP (dest, 0)) == MINUS)
1601 if (cfa_store.reg == (unsigned) REGNO (XEXP (XEXP (dest, 0), 0)))
1602 offset -= cfa_store.offset;
1603 else if (cfa_temp.reg == (unsigned) REGNO (XEXP (XEXP (dest, 0), 0)))
1604 offset -= cfa_temp.offset;
1610 /* Without an offset. */
1612 if (cfa_store.reg == (unsigned) REGNO (XEXP (dest, 0)))
1613 offset = -cfa_store.offset;
1614 else if (cfa_temp.reg == (unsigned) REGNO (XEXP (dest, 0)))
1615 offset = -cfa_temp.offset;
1622 if (cfa_temp.reg != (unsigned) REGNO (XEXP (XEXP (dest, 0), 0)))
1624 offset = -cfa_temp.offset;
1625 cfa_temp.offset -= GET_MODE_SIZE (GET_MODE (dest));
1632 if (REGNO (src) != STACK_POINTER_REGNUM
1633 && REGNO (src) != HARD_FRAME_POINTER_REGNUM
1634 && (unsigned) REGNO (src) == cfa.reg)
1636 /* We're storing the current CFA reg into the stack. */
1638 if (cfa.offset == 0)
1640 /* If the source register is exactly the CFA, assume
1641 we're saving SP like any other register; this happens
1643 def_cfa_1 (label, &cfa);
1644 queue_reg_save (label, stack_pointer_rtx, offset);
1649 /* Otherwise, we'll need to look in the stack to
1650 calculate the CFA. */
1651 rtx x = XEXP (dest, 0);
1653 if (GET_CODE (x) != REG)
1655 if (GET_CODE (x) != REG)
1658 cfa.reg = REGNO (x);
1659 cfa.base_offset = offset;
1661 def_cfa_1 (label, &cfa);
1666 def_cfa_1 (label, &cfa);
1667 queue_reg_save (label, src, offset);
1675 /* Record call frame debugging information for INSN, which either
1676 sets SP or FP (adjusting how we calculate the frame address) or saves a
1677 register to the stack. If INSN is NULL_RTX, initialize our state. */
1680 dwarf2out_frame_debug (rtx insn)
1685 if (insn == NULL_RTX)
1687 /* Flush any queued register saves. */
1688 flush_queued_reg_saves ();
1690 /* Set up state for generating call frame debug info. */
1692 if (cfa.reg != (unsigned long) DWARF_FRAME_REGNUM (STACK_POINTER_REGNUM))
1695 cfa.reg = STACK_POINTER_REGNUM;
1698 cfa_temp.offset = 0;
1702 if (GET_CODE (insn) != INSN || clobbers_queued_reg_save (insn))
1703 flush_queued_reg_saves ();
1705 if (! RTX_FRAME_RELATED_P (insn))
1707 if (!ACCUMULATE_OUTGOING_ARGS)
1708 dwarf2out_stack_adjust (insn);
1713 label = dwarf2out_cfi_label ();
1714 src = find_reg_note (insn, REG_FRAME_RELATED_EXPR, NULL_RTX);
1716 insn = XEXP (src, 0);
1718 insn = PATTERN (insn);
1720 dwarf2out_frame_debug_expr (insn, label);
1725 /* Describe for the GTY machinery what parts of dw_cfi_oprnd1 are used. */
1726 static enum dw_cfi_oprnd_type dw_cfi_oprnd1_desc
1727 (enum dwarf_call_frame_info cfi);
1729 static enum dw_cfi_oprnd_type
1730 dw_cfi_oprnd1_desc (enum dwarf_call_frame_info cfi)
1735 case DW_CFA_GNU_window_save:
1736 return dw_cfi_oprnd_unused;
1738 case DW_CFA_set_loc:
1739 case DW_CFA_advance_loc1:
1740 case DW_CFA_advance_loc2:
1741 case DW_CFA_advance_loc4:
1742 case DW_CFA_MIPS_advance_loc8:
1743 return dw_cfi_oprnd_addr;
1746 case DW_CFA_offset_extended:
1747 case DW_CFA_def_cfa:
1748 case DW_CFA_offset_extended_sf:
1749 case DW_CFA_def_cfa_sf:
1750 case DW_CFA_restore_extended:
1751 case DW_CFA_undefined:
1752 case DW_CFA_same_value:
1753 case DW_CFA_def_cfa_register:
1754 case DW_CFA_register:
1755 return dw_cfi_oprnd_reg_num;
1757 case DW_CFA_def_cfa_offset:
1758 case DW_CFA_GNU_args_size:
1759 case DW_CFA_def_cfa_offset_sf:
1760 return dw_cfi_oprnd_offset;
1762 case DW_CFA_def_cfa_expression:
1763 case DW_CFA_expression:
1764 return dw_cfi_oprnd_loc;
1771 /* Describe for the GTY machinery what parts of dw_cfi_oprnd2 are used. */
1772 static enum dw_cfi_oprnd_type dw_cfi_oprnd2_desc
1773 (enum dwarf_call_frame_info cfi);
1775 static enum dw_cfi_oprnd_type
1776 dw_cfi_oprnd2_desc (enum dwarf_call_frame_info cfi)
1780 case DW_CFA_def_cfa:
1781 case DW_CFA_def_cfa_sf:
1783 case DW_CFA_offset_extended_sf:
1784 case DW_CFA_offset_extended:
1785 return dw_cfi_oprnd_offset;
1787 case DW_CFA_register:
1788 return dw_cfi_oprnd_reg_num;
1791 return dw_cfi_oprnd_unused;
1795 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
1797 /* Map register numbers held in the call frame info that gcc has
1798 collected using DWARF_FRAME_REGNUM to those that should be output in
1799 .debug_frame and .eh_frame. */
1800 #ifndef DWARF2_FRAME_REG_OUT
1801 #define DWARF2_FRAME_REG_OUT(REGNO, FOR_EH) (REGNO)
1804 /* Output a Call Frame Information opcode and its operand(s). */
1807 output_cfi (dw_cfi_ref cfi, dw_fde_ref fde, int for_eh)
1810 if (cfi->dw_cfi_opc == DW_CFA_advance_loc)
1811 dw2_asm_output_data (1, (cfi->dw_cfi_opc
1812 | (cfi->dw_cfi_oprnd1.dw_cfi_offset & 0x3f)),
1813 "DW_CFA_advance_loc " HOST_WIDE_INT_PRINT_HEX,
1814 cfi->dw_cfi_oprnd1.dw_cfi_offset);
1815 else if (cfi->dw_cfi_opc == DW_CFA_offset)
1817 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd1.dw_cfi_reg_num, for_eh);
1818 dw2_asm_output_data (1, (cfi->dw_cfi_opc | (r & 0x3f)),
1819 "DW_CFA_offset, column 0x%lx", r);
1820 dw2_asm_output_data_uleb128 (cfi->dw_cfi_oprnd2.dw_cfi_offset, NULL);
1822 else if (cfi->dw_cfi_opc == DW_CFA_restore)
1824 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd1.dw_cfi_reg_num, for_eh);
1825 dw2_asm_output_data (1, (cfi->dw_cfi_opc | (r & 0x3f)),
1826 "DW_CFA_restore, column 0x%lx", r);
1830 dw2_asm_output_data (1, cfi->dw_cfi_opc,
1831 "%s", dwarf_cfi_name (cfi->dw_cfi_opc));
1833 switch (cfi->dw_cfi_opc)
1835 case DW_CFA_set_loc:
1837 dw2_asm_output_encoded_addr_rtx (
1838 ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/1, /*global=*/0),
1839 gen_rtx_SYMBOL_REF (Pmode, cfi->dw_cfi_oprnd1.dw_cfi_addr),
1842 dw2_asm_output_addr (DWARF2_ADDR_SIZE,
1843 cfi->dw_cfi_oprnd1.dw_cfi_addr, NULL);
1846 case DW_CFA_advance_loc1:
1847 dw2_asm_output_delta (1, cfi->dw_cfi_oprnd1.dw_cfi_addr,
1848 fde->dw_fde_current_label, NULL);
1849 fde->dw_fde_current_label = cfi->dw_cfi_oprnd1.dw_cfi_addr;
1852 case DW_CFA_advance_loc2:
1853 dw2_asm_output_delta (2, cfi->dw_cfi_oprnd1.dw_cfi_addr,
1854 fde->dw_fde_current_label, NULL);
1855 fde->dw_fde_current_label = cfi->dw_cfi_oprnd1.dw_cfi_addr;
1858 case DW_CFA_advance_loc4:
1859 dw2_asm_output_delta (4, cfi->dw_cfi_oprnd1.dw_cfi_addr,
1860 fde->dw_fde_current_label, NULL);
1861 fde->dw_fde_current_label = cfi->dw_cfi_oprnd1.dw_cfi_addr;
1864 case DW_CFA_MIPS_advance_loc8:
1865 dw2_asm_output_delta (8, cfi->dw_cfi_oprnd1.dw_cfi_addr,
1866 fde->dw_fde_current_label, NULL);
1867 fde->dw_fde_current_label = cfi->dw_cfi_oprnd1.dw_cfi_addr;
1870 case DW_CFA_offset_extended:
1871 case DW_CFA_def_cfa:
1872 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd1.dw_cfi_reg_num, for_eh);
1873 dw2_asm_output_data_uleb128 (r, NULL);
1874 dw2_asm_output_data_uleb128 (cfi->dw_cfi_oprnd2.dw_cfi_offset, NULL);
1877 case DW_CFA_offset_extended_sf:
1878 case DW_CFA_def_cfa_sf:
1879 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd1.dw_cfi_reg_num, for_eh);
1880 dw2_asm_output_data_uleb128 (r, NULL);
1881 dw2_asm_output_data_sleb128 (cfi->dw_cfi_oprnd2.dw_cfi_offset, NULL);
1884 case DW_CFA_restore_extended:
1885 case DW_CFA_undefined:
1886 case DW_CFA_same_value:
1887 case DW_CFA_def_cfa_register:
1888 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd1.dw_cfi_reg_num, for_eh);
1889 dw2_asm_output_data_uleb128 (r, NULL);
1892 case DW_CFA_register:
1893 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd1.dw_cfi_reg_num, for_eh);
1894 dw2_asm_output_data_uleb128 (r, NULL);
1895 r = DWARF2_FRAME_REG_OUT (cfi->dw_cfi_oprnd2.dw_cfi_reg_num, for_eh);
1896 dw2_asm_output_data_uleb128 (r, NULL);
1899 case DW_CFA_def_cfa_offset:
1900 case DW_CFA_GNU_args_size:
1901 dw2_asm_output_data_uleb128 (cfi->dw_cfi_oprnd1.dw_cfi_offset, NULL);
1904 case DW_CFA_def_cfa_offset_sf:
1905 dw2_asm_output_data_sleb128 (cfi->dw_cfi_oprnd1.dw_cfi_offset, NULL);
1908 case DW_CFA_GNU_window_save:
1911 case DW_CFA_def_cfa_expression:
1912 case DW_CFA_expression:
1913 output_cfa_loc (cfi);
1916 case DW_CFA_GNU_negative_offset_extended:
1917 /* Obsoleted by DW_CFA_offset_extended_sf. */
1926 /* Output the call frame information used to record information
1927 that relates to calculating the frame pointer, and records the
1928 location of saved registers. */
1931 output_call_frame_info (int for_eh)
1936 char l1[20], l2[20], section_start_label[20];
1937 bool any_lsda_needed = false;
1938 char augmentation[6];
1939 int augmentation_size;
1940 int fde_encoding = DW_EH_PE_absptr;
1941 int per_encoding = DW_EH_PE_absptr;
1942 int lsda_encoding = DW_EH_PE_absptr;
1944 /* Don't emit a CIE if there won't be any FDEs. */
1945 if (fde_table_in_use == 0)
1948 /* If we make FDEs linkonce, we may have to emit an empty label for
1949 an FDE that wouldn't otherwise be emitted. We want to avoid
1950 having an FDE kept around when the function it refers to is
1951 discarded. (Example where this matters: a primary function
1952 template in C++ requires EH information, but an explicit
1953 specialization doesn't. */
1954 if (TARGET_USES_WEAK_UNWIND_INFO
1955 && ! flag_asynchronous_unwind_tables
1957 for (i = 0; i < fde_table_in_use; i++)
1958 if ((fde_table[i].nothrow || fde_table[i].all_throwers_are_sibcalls)
1959 && !fde_table[i].uses_eh_lsda
1960 && ! DECL_ONE_ONLY (fde_table[i].decl))
1961 (*targetm.asm_out.unwind_label) (asm_out_file, fde_table[i].decl,
1964 /* If we don't have any functions we'll want to unwind out of, don't
1965 emit any EH unwind information. Note that if exceptions aren't
1966 enabled, we won't have collected nothrow information, and if we
1967 asked for asynchronous tables, we always want this info. */
1970 bool any_eh_needed = !flag_exceptions || flag_asynchronous_unwind_tables;
1972 for (i = 0; i < fde_table_in_use; i++)
1973 if (fde_table[i].uses_eh_lsda)
1974 any_eh_needed = any_lsda_needed = true;
1975 else if (TARGET_USES_WEAK_UNWIND_INFO
1976 && DECL_ONE_ONLY (fde_table[i].decl))
1978 else if (! fde_table[i].nothrow
1979 && ! fde_table[i].all_throwers_are_sibcalls)
1980 any_eh_needed = true;
1982 if (! any_eh_needed)
1986 /* We're going to be generating comments, so turn on app. */
1991 (*targetm.asm_out.eh_frame_section) ();
1993 named_section_flags (DEBUG_FRAME_SECTION, SECTION_DEBUG);
1995 ASM_GENERATE_INTERNAL_LABEL (section_start_label, FRAME_BEGIN_LABEL, for_eh);
1996 ASM_OUTPUT_LABEL (asm_out_file, section_start_label);
1998 /* Output the CIE. */
1999 ASM_GENERATE_INTERNAL_LABEL (l1, CIE_AFTER_SIZE_LABEL, for_eh);
2000 ASM_GENERATE_INTERNAL_LABEL (l2, CIE_END_LABEL, for_eh);
2001 dw2_asm_output_delta (for_eh ? 4 : DWARF_OFFSET_SIZE, l2, l1,
2002 "Length of Common Information Entry");
2003 ASM_OUTPUT_LABEL (asm_out_file, l1);
2005 /* Now that the CIE pointer is PC-relative for EH,
2006 use 0 to identify the CIE. */
2007 dw2_asm_output_data ((for_eh ? 4 : DWARF_OFFSET_SIZE),
2008 (for_eh ? 0 : DW_CIE_ID),
2009 "CIE Identifier Tag");
2011 dw2_asm_output_data (1, DW_CIE_VERSION, "CIE Version");
2013 augmentation[0] = 0;
2014 augmentation_size = 0;
2020 z Indicates that a uleb128 is present to size the
2021 augmentation section.
2022 L Indicates the encoding (and thus presence) of
2023 an LSDA pointer in the FDE augmentation.
2024 R Indicates a non-default pointer encoding for
2026 P Indicates the presence of an encoding + language
2027 personality routine in the CIE augmentation. */
2029 fde_encoding = TARGET_USES_WEAK_UNWIND_INFO
2030 ? ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/2, /*global=*/1)
2031 : ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/1, /*global=*/0);
2032 per_encoding = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/2, /*global=*/1);
2033 lsda_encoding = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/0);
2035 p = augmentation + 1;
2036 if (eh_personality_libfunc)
2039 augmentation_size += 1 + size_of_encoded_value (per_encoding);
2041 if (any_lsda_needed)
2044 augmentation_size += 1;
2046 if (fde_encoding != DW_EH_PE_absptr)
2049 augmentation_size += 1;
2051 if (p > augmentation + 1)
2053 augmentation[0] = 'z';
2057 /* Ug. Some platforms can't do unaligned dynamic relocations at all. */
2058 if (eh_personality_libfunc && per_encoding == DW_EH_PE_aligned)
2060 int offset = ( 4 /* Length */
2062 + 1 /* CIE version */
2063 + strlen (augmentation) + 1 /* Augmentation */
2064 + size_of_uleb128 (1) /* Code alignment */
2065 + size_of_sleb128 (DWARF_CIE_DATA_ALIGNMENT)
2067 + 1 /* Augmentation size */
2068 + 1 /* Personality encoding */ );
2069 int pad = -offset & (PTR_SIZE - 1);
2071 augmentation_size += pad;
2073 /* Augmentations should be small, so there's scarce need to
2074 iterate for a solution. Die if we exceed one uleb128 byte. */
2075 if (size_of_uleb128 (augmentation_size) != 1)
2080 dw2_asm_output_nstring (augmentation, -1, "CIE Augmentation");
2081 dw2_asm_output_data_uleb128 (1, "CIE Code Alignment Factor");
2082 dw2_asm_output_data_sleb128 (DWARF_CIE_DATA_ALIGNMENT,
2083 "CIE Data Alignment Factor");
2084 dw2_asm_output_data (1, DWARF_FRAME_RETURN_COLUMN, "CIE RA Column");
2086 if (augmentation[0])
2088 dw2_asm_output_data_uleb128 (augmentation_size, "Augmentation size");
2089 if (eh_personality_libfunc)
2091 dw2_asm_output_data (1, per_encoding, "Personality (%s)",
2092 eh_data_format_name (per_encoding));
2093 dw2_asm_output_encoded_addr_rtx (per_encoding,
2094 eh_personality_libfunc, NULL);
2097 if (any_lsda_needed)
2098 dw2_asm_output_data (1, lsda_encoding, "LSDA Encoding (%s)",
2099 eh_data_format_name (lsda_encoding));
2101 if (fde_encoding != DW_EH_PE_absptr)
2102 dw2_asm_output_data (1, fde_encoding, "FDE Encoding (%s)",
2103 eh_data_format_name (fde_encoding));
2106 for (cfi = cie_cfi_head; cfi != NULL; cfi = cfi->dw_cfi_next)
2107 output_cfi (cfi, NULL, for_eh);
2109 /* Pad the CIE out to an address sized boundary. */
2110 ASM_OUTPUT_ALIGN (asm_out_file,
2111 floor_log2 (for_eh ? PTR_SIZE : DWARF2_ADDR_SIZE));
2112 ASM_OUTPUT_LABEL (asm_out_file, l2);
2114 /* Loop through all of the FDE's. */
2115 for (i = 0; i < fde_table_in_use; i++)
2117 fde = &fde_table[i];
2119 /* Don't emit EH unwind info for leaf functions that don't need it. */
2120 if (for_eh && !flag_asynchronous_unwind_tables && flag_exceptions
2121 && (fde->nothrow || fde->all_throwers_are_sibcalls)
2122 && (! TARGET_USES_WEAK_UNWIND_INFO || ! DECL_ONE_ONLY (fde->decl))
2123 && !fde->uses_eh_lsda)
2126 (*targetm.asm_out.unwind_label) (asm_out_file, fde->decl, /* empty */ 0);
2127 (*targetm.asm_out.internal_label) (asm_out_file, FDE_LABEL, for_eh + i * 2);
2128 ASM_GENERATE_INTERNAL_LABEL (l1, FDE_AFTER_SIZE_LABEL, for_eh + i * 2);
2129 ASM_GENERATE_INTERNAL_LABEL (l2, FDE_END_LABEL, for_eh + i * 2);
2130 dw2_asm_output_delta (for_eh ? 4 : DWARF_OFFSET_SIZE, l2, l1,
2132 ASM_OUTPUT_LABEL (asm_out_file, l1);
2135 dw2_asm_output_delta (4, l1, section_start_label, "FDE CIE offset");
2137 dw2_asm_output_offset (DWARF_OFFSET_SIZE, section_start_label,
2142 if (TARGET_USES_WEAK_UNWIND_INFO
2143 && DECL_ONE_ONLY (fde->decl))
2144 dw2_asm_output_encoded_addr_rtx (fde_encoding,
2145 gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER
2146 (DECL_ASSEMBLER_NAME (fde->decl))),
2147 "FDE initial location");
2149 dw2_asm_output_encoded_addr_rtx (fde_encoding,
2150 gen_rtx_SYMBOL_REF (Pmode, fde->dw_fde_begin),
2151 "FDE initial location");
2152 dw2_asm_output_delta (size_of_encoded_value (fde_encoding),
2153 fde->dw_fde_end, fde->dw_fde_begin,
2154 "FDE address range");
2158 dw2_asm_output_addr (DWARF2_ADDR_SIZE, fde->dw_fde_begin,
2159 "FDE initial location");
2160 dw2_asm_output_delta (DWARF2_ADDR_SIZE,
2161 fde->dw_fde_end, fde->dw_fde_begin,
2162 "FDE address range");
2165 if (augmentation[0])
2167 if (any_lsda_needed)
2169 int size = size_of_encoded_value (lsda_encoding);
2171 if (lsda_encoding == DW_EH_PE_aligned)
2173 int offset = ( 4 /* Length */
2174 + 4 /* CIE offset */
2175 + 2 * size_of_encoded_value (fde_encoding)
2176 + 1 /* Augmentation size */ );
2177 int pad = -offset & (PTR_SIZE - 1);
2180 if (size_of_uleb128 (size) != 1)
2184 dw2_asm_output_data_uleb128 (size, "Augmentation size");
2186 if (fde->uses_eh_lsda)
2188 ASM_GENERATE_INTERNAL_LABEL (l1, "LLSDA",
2189 fde->funcdef_number);
2190 dw2_asm_output_encoded_addr_rtx (
2191 lsda_encoding, gen_rtx_SYMBOL_REF (Pmode, l1),
2192 "Language Specific Data Area");
2196 if (lsda_encoding == DW_EH_PE_aligned)
2197 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (PTR_SIZE));
2199 (size_of_encoded_value (lsda_encoding), 0,
2200 "Language Specific Data Area (none)");
2204 dw2_asm_output_data_uleb128 (0, "Augmentation size");
2207 /* Loop through the Call Frame Instructions associated with
2209 fde->dw_fde_current_label = fde->dw_fde_begin;
2210 for (cfi = fde->dw_fde_cfi; cfi != NULL; cfi = cfi->dw_cfi_next)
2211 output_cfi (cfi, fde, for_eh);
2213 /* Pad the FDE out to an address sized boundary. */
2214 ASM_OUTPUT_ALIGN (asm_out_file,
2215 floor_log2 ((for_eh ? PTR_SIZE : DWARF2_ADDR_SIZE)));
2216 ASM_OUTPUT_LABEL (asm_out_file, l2);
2219 if (for_eh && targetm.terminate_dw2_eh_frame_info)
2220 dw2_asm_output_data (4, 0, "End of Table");
2221 #ifdef MIPS_DEBUGGING_INFO
2222 /* Work around Irix 6 assembler bug whereby labels at the end of a section
2223 get a value of 0. Putting .align 0 after the label fixes it. */
2224 ASM_OUTPUT_ALIGN (asm_out_file, 0);
2227 /* Turn off app to make assembly quicker. */
2232 /* Output a marker (i.e. a label) for the beginning of a function, before
2236 dwarf2out_begin_prologue (unsigned int line ATTRIBUTE_UNUSED,
2237 const char *file ATTRIBUTE_UNUSED)
2239 char label[MAX_ARTIFICIAL_LABEL_BYTES];
2242 current_function_func_begin_label = 0;
2244 #ifdef IA64_UNWIND_INFO
2245 /* ??? current_function_func_begin_label is also used by except.c
2246 for call-site information. We must emit this label if it might
2248 if ((! flag_exceptions || USING_SJLJ_EXCEPTIONS)
2249 && ! dwarf2out_do_frame ())
2252 if (! dwarf2out_do_frame ())
2256 function_section (current_function_decl);
2257 ASM_GENERATE_INTERNAL_LABEL (label, FUNC_BEGIN_LABEL,
2258 current_function_funcdef_no);
2259 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, FUNC_BEGIN_LABEL,
2260 current_function_funcdef_no);
2261 current_function_func_begin_label = get_identifier (label);
2263 #ifdef IA64_UNWIND_INFO
2264 /* We can elide the fde allocation if we're not emitting debug info. */
2265 if (! dwarf2out_do_frame ())
2269 /* Expand the fde table if necessary. */
2270 if (fde_table_in_use == fde_table_allocated)
2272 fde_table_allocated += FDE_TABLE_INCREMENT;
2273 fde_table = ggc_realloc (fde_table,
2274 fde_table_allocated * sizeof (dw_fde_node));
2275 memset (fde_table + fde_table_in_use, 0,
2276 FDE_TABLE_INCREMENT * sizeof (dw_fde_node));
2279 /* Record the FDE associated with this function. */
2280 current_funcdef_fde = fde_table_in_use;
2282 /* Add the new FDE at the end of the fde_table. */
2283 fde = &fde_table[fde_table_in_use++];
2284 fde->decl = current_function_decl;
2285 fde->dw_fde_begin = xstrdup (label);
2286 fde->dw_fde_current_label = NULL;
2287 fde->dw_fde_end = NULL;
2288 fde->dw_fde_cfi = NULL;
2289 fde->funcdef_number = current_function_funcdef_no;
2290 fde->nothrow = current_function_nothrow;
2291 fde->uses_eh_lsda = cfun->uses_eh_lsda;
2292 fde->all_throwers_are_sibcalls = cfun->all_throwers_are_sibcalls;
2294 args_size = old_args_size = 0;
2296 /* We only want to output line number information for the genuine dwarf2
2297 prologue case, not the eh frame case. */
2298 #ifdef DWARF2_DEBUGGING_INFO
2300 dwarf2out_source_line (line, file);
2304 /* Output a marker (i.e. a label) for the absolute end of the generated code
2305 for a function definition. This gets called *after* the epilogue code has
2309 dwarf2out_end_epilogue (unsigned int line ATTRIBUTE_UNUSED,
2310 const char *file ATTRIBUTE_UNUSED)
2313 char label[MAX_ARTIFICIAL_LABEL_BYTES];
2315 /* Output a label to mark the endpoint of the code generated for this
2317 ASM_GENERATE_INTERNAL_LABEL (label, FUNC_END_LABEL,
2318 current_function_funcdef_no);
2319 ASM_OUTPUT_LABEL (asm_out_file, label);
2320 fde = &fde_table[fde_table_in_use - 1];
2321 fde->dw_fde_end = xstrdup (label);
2325 dwarf2out_frame_init (void)
2327 /* Allocate the initial hunk of the fde_table. */
2328 fde_table = ggc_alloc_cleared (FDE_TABLE_INCREMENT * sizeof (dw_fde_node));
2329 fde_table_allocated = FDE_TABLE_INCREMENT;
2330 fde_table_in_use = 0;
2332 /* Generate the CFA instructions common to all FDE's. Do it now for the
2333 sake of lookup_cfa. */
2335 #ifdef DWARF2_UNWIND_INFO
2336 /* On entry, the Canonical Frame Address is at SP. */
2337 dwarf2out_def_cfa (NULL, STACK_POINTER_REGNUM, INCOMING_FRAME_SP_OFFSET);
2338 initial_return_save (INCOMING_RETURN_ADDR_RTX);
2343 dwarf2out_frame_finish (void)
2345 /* Output call frame information. */
2346 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
2347 output_call_frame_info (0);
2349 if (! USING_SJLJ_EXCEPTIONS && (flag_unwind_tables || flag_exceptions))
2350 output_call_frame_info (1);
2354 /* And now, the subset of the debugging information support code necessary
2355 for emitting location expressions. */
2357 /* We need some way to distinguish DW_OP_addr with a direct symbol
2358 relocation from DW_OP_addr with a dtp-relative symbol relocation. */
2359 #define INTERNAL_DW_OP_tls_addr (0x100 + DW_OP_addr)
2362 typedef struct dw_val_struct *dw_val_ref;
2363 typedef struct die_struct *dw_die_ref;
2364 typedef struct dw_loc_descr_struct *dw_loc_descr_ref;
2365 typedef struct dw_loc_list_struct *dw_loc_list_ref;
2367 /* Each DIE may have a series of attribute/value pairs. Values
2368 can take on several forms. The forms that are used in this
2369 implementation are listed below. */
2374 dw_val_class_offset,
2376 dw_val_class_loc_list,
2377 dw_val_class_range_list,
2379 dw_val_class_unsigned_const,
2380 dw_val_class_long_long,
2383 dw_val_class_die_ref,
2384 dw_val_class_fde_ref,
2385 dw_val_class_lbl_id,
2386 dw_val_class_lbl_offset,
2390 /* Describe a double word constant value. */
2391 /* ??? Every instance of long_long in the code really means CONST_DOUBLE. */
2393 typedef struct dw_long_long_struct GTY(())
2400 /* Describe a floating point constant value, or a vector constant value. */
2402 typedef struct dw_vec_struct GTY(())
2404 unsigned char * GTY((length ("%h.length"))) array;
2410 /* The dw_val_node describes an attribute's value, as it is
2411 represented internally. */
2413 typedef struct dw_val_struct GTY(())
2415 enum dw_val_class val_class;
2416 union dw_val_struct_union
2418 rtx GTY ((tag ("dw_val_class_addr"))) val_addr;
2419 unsigned HOST_WIDE_INT GTY ((tag ("dw_val_class_offset"))) val_offset;
2420 dw_loc_list_ref GTY ((tag ("dw_val_class_loc_list"))) val_loc_list;
2421 dw_loc_descr_ref GTY ((tag ("dw_val_class_loc"))) val_loc;
2422 HOST_WIDE_INT GTY ((default (""))) val_int;
2423 unsigned HOST_WIDE_INT GTY ((tag ("dw_val_class_unsigned_const"))) val_unsigned;
2424 dw_long_long_const GTY ((tag ("dw_val_class_long_long"))) val_long_long;
2425 dw_vec_const GTY ((tag ("dw_val_class_vec"))) val_vec;
2426 struct dw_val_die_union
2430 } GTY ((tag ("dw_val_class_die_ref"))) val_die_ref;
2431 unsigned GTY ((tag ("dw_val_class_fde_ref"))) val_fde_index;
2432 struct indirect_string_node * GTY ((tag ("dw_val_class_str"))) val_str;
2433 char * GTY ((tag ("dw_val_class_lbl_id"))) val_lbl_id;
2434 unsigned char GTY ((tag ("dw_val_class_flag"))) val_flag;
2436 GTY ((desc ("%1.val_class"))) v;
2440 /* Locations in memory are described using a sequence of stack machine
2443 typedef struct dw_loc_descr_struct GTY(())
2445 dw_loc_descr_ref dw_loc_next;
2446 enum dwarf_location_atom dw_loc_opc;
2447 dw_val_node dw_loc_oprnd1;
2448 dw_val_node dw_loc_oprnd2;
2453 /* Location lists are ranges + location descriptions for that range,
2454 so you can track variables that are in different places over
2455 their entire life. */
2456 typedef struct dw_loc_list_struct GTY(())
2458 dw_loc_list_ref dw_loc_next;
2459 const char *begin; /* Label for begin address of range */
2460 const char *end; /* Label for end address of range */
2461 char *ll_symbol; /* Label for beginning of location list.
2462 Only on head of list */
2463 const char *section; /* Section this loclist is relative to */
2464 dw_loc_descr_ref expr;
2467 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
2469 static const char *dwarf_stack_op_name (unsigned);
2470 static dw_loc_descr_ref new_loc_descr (enum dwarf_location_atom,
2471 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
2472 static void add_loc_descr (dw_loc_descr_ref *, dw_loc_descr_ref);
2473 static unsigned long size_of_loc_descr (dw_loc_descr_ref);
2474 static unsigned long size_of_locs (dw_loc_descr_ref);
2475 static void output_loc_operands (dw_loc_descr_ref);
2476 static void output_loc_sequence (dw_loc_descr_ref);
2478 /* Convert a DWARF stack opcode into its string name. */
2481 dwarf_stack_op_name (unsigned int op)
2486 case INTERNAL_DW_OP_tls_addr:
2487 return "DW_OP_addr";
2489 return "DW_OP_deref";
2491 return "DW_OP_const1u";
2493 return "DW_OP_const1s";
2495 return "DW_OP_const2u";
2497 return "DW_OP_const2s";
2499 return "DW_OP_const4u";
2501 return "DW_OP_const4s";
2503 return "DW_OP_const8u";
2505 return "DW_OP_const8s";
2507 return "DW_OP_constu";
2509 return "DW_OP_consts";
2513 return "DW_OP_drop";
2515 return "DW_OP_over";
2517 return "DW_OP_pick";
2519 return "DW_OP_swap";
2523 return "DW_OP_xderef";
2531 return "DW_OP_minus";
2543 return "DW_OP_plus";
2544 case DW_OP_plus_uconst:
2545 return "DW_OP_plus_uconst";
2551 return "DW_OP_shra";
2569 return "DW_OP_skip";
2571 return "DW_OP_lit0";
2573 return "DW_OP_lit1";
2575 return "DW_OP_lit2";
2577 return "DW_OP_lit3";
2579 return "DW_OP_lit4";
2581 return "DW_OP_lit5";
2583 return "DW_OP_lit6";
2585 return "DW_OP_lit7";
2587 return "DW_OP_lit8";
2589 return "DW_OP_lit9";
2591 return "DW_OP_lit10";
2593 return "DW_OP_lit11";
2595 return "DW_OP_lit12";
2597 return "DW_OP_lit13";
2599 return "DW_OP_lit14";
2601 return "DW_OP_lit15";
2603 return "DW_OP_lit16";
2605 return "DW_OP_lit17";
2607 return "DW_OP_lit18";
2609 return "DW_OP_lit19";
2611 return "DW_OP_lit20";
2613 return "DW_OP_lit21";
2615 return "DW_OP_lit22";
2617 return "DW_OP_lit23";
2619 return "DW_OP_lit24";
2621 return "DW_OP_lit25";
2623 return "DW_OP_lit26";
2625 return "DW_OP_lit27";
2627 return "DW_OP_lit28";
2629 return "DW_OP_lit29";
2631 return "DW_OP_lit30";
2633 return "DW_OP_lit31";
2635 return "DW_OP_reg0";
2637 return "DW_OP_reg1";
2639 return "DW_OP_reg2";
2641 return "DW_OP_reg3";
2643 return "DW_OP_reg4";
2645 return "DW_OP_reg5";
2647 return "DW_OP_reg6";
2649 return "DW_OP_reg7";
2651 return "DW_OP_reg8";
2653 return "DW_OP_reg9";
2655 return "DW_OP_reg10";
2657 return "DW_OP_reg11";
2659 return "DW_OP_reg12";
2661 return "DW_OP_reg13";
2663 return "DW_OP_reg14";
2665 return "DW_OP_reg15";
2667 return "DW_OP_reg16";
2669 return "DW_OP_reg17";
2671 return "DW_OP_reg18";
2673 return "DW_OP_reg19";
2675 return "DW_OP_reg20";
2677 return "DW_OP_reg21";
2679 return "DW_OP_reg22";
2681 return "DW_OP_reg23";
2683 return "DW_OP_reg24";
2685 return "DW_OP_reg25";
2687 return "DW_OP_reg26";
2689 return "DW_OP_reg27";
2691 return "DW_OP_reg28";
2693 return "DW_OP_reg29";
2695 return "DW_OP_reg30";
2697 return "DW_OP_reg31";
2699 return "DW_OP_breg0";
2701 return "DW_OP_breg1";
2703 return "DW_OP_breg2";
2705 return "DW_OP_breg3";
2707 return "DW_OP_breg4";
2709 return "DW_OP_breg5";
2711 return "DW_OP_breg6";
2713 return "DW_OP_breg7";
2715 return "DW_OP_breg8";
2717 return "DW_OP_breg9";
2719 return "DW_OP_breg10";
2721 return "DW_OP_breg11";
2723 return "DW_OP_breg12";
2725 return "DW_OP_breg13";
2727 return "DW_OP_breg14";
2729 return "DW_OP_breg15";
2731 return "DW_OP_breg16";
2733 return "DW_OP_breg17";
2735 return "DW_OP_breg18";
2737 return "DW_OP_breg19";
2739 return "DW_OP_breg20";
2741 return "DW_OP_breg21";
2743 return "DW_OP_breg22";
2745 return "DW_OP_breg23";
2747 return "DW_OP_breg24";
2749 return "DW_OP_breg25";
2751 return "DW_OP_breg26";
2753 return "DW_OP_breg27";
2755 return "DW_OP_breg28";
2757 return "DW_OP_breg29";
2759 return "DW_OP_breg30";
2761 return "DW_OP_breg31";
2763 return "DW_OP_regx";
2765 return "DW_OP_fbreg";
2767 return "DW_OP_bregx";
2769 return "DW_OP_piece";
2770 case DW_OP_deref_size:
2771 return "DW_OP_deref_size";
2772 case DW_OP_xderef_size:
2773 return "DW_OP_xderef_size";
2776 case DW_OP_push_object_address:
2777 return "DW_OP_push_object_address";
2779 return "DW_OP_call2";
2781 return "DW_OP_call4";
2782 case DW_OP_call_ref:
2783 return "DW_OP_call_ref";
2784 case DW_OP_GNU_push_tls_address:
2785 return "DW_OP_GNU_push_tls_address";
2787 return "OP_<unknown>";
2791 /* Return a pointer to a newly allocated location description. Location
2792 descriptions are simple expression terms that can be strung
2793 together to form more complicated location (address) descriptions. */
2795 static inline dw_loc_descr_ref
2796 new_loc_descr (enum dwarf_location_atom op, unsigned HOST_WIDE_INT oprnd1,
2797 unsigned HOST_WIDE_INT oprnd2)
2799 dw_loc_descr_ref descr = ggc_alloc_cleared (sizeof (dw_loc_descr_node));
2801 descr->dw_loc_opc = op;
2802 descr->dw_loc_oprnd1.val_class = dw_val_class_unsigned_const;
2803 descr->dw_loc_oprnd1.v.val_unsigned = oprnd1;
2804 descr->dw_loc_oprnd2.val_class = dw_val_class_unsigned_const;
2805 descr->dw_loc_oprnd2.v.val_unsigned = oprnd2;
2811 /* Add a location description term to a location description expression. */
2814 add_loc_descr (dw_loc_descr_ref *list_head, dw_loc_descr_ref descr)
2816 dw_loc_descr_ref *d;
2818 /* Find the end of the chain. */
2819 for (d = list_head; (*d) != NULL; d = &(*d)->dw_loc_next)
2825 /* Return the size of a location descriptor. */
2827 static unsigned long
2828 size_of_loc_descr (dw_loc_descr_ref loc)
2830 unsigned long size = 1;
2832 switch (loc->dw_loc_opc)
2835 case INTERNAL_DW_OP_tls_addr:
2836 size += DWARF2_ADDR_SIZE;
2855 size += size_of_uleb128 (loc->dw_loc_oprnd1.v.val_unsigned);
2858 size += size_of_sleb128 (loc->dw_loc_oprnd1.v.val_int);
2863 case DW_OP_plus_uconst:
2864 size += size_of_uleb128 (loc->dw_loc_oprnd1.v.val_unsigned);
2902 size += size_of_sleb128 (loc->dw_loc_oprnd1.v.val_int);
2905 size += size_of_uleb128 (loc->dw_loc_oprnd1.v.val_unsigned);
2908 size += size_of_sleb128 (loc->dw_loc_oprnd1.v.val_int);
2911 size += size_of_uleb128 (loc->dw_loc_oprnd1.v.val_unsigned);
2912 size += size_of_sleb128 (loc->dw_loc_oprnd2.v.val_int);
2915 size += size_of_uleb128 (loc->dw_loc_oprnd1.v.val_unsigned);
2917 case DW_OP_deref_size:
2918 case DW_OP_xderef_size:
2927 case DW_OP_call_ref:
2928 size += DWARF2_ADDR_SIZE;
2937 /* Return the size of a series of location descriptors. */
2939 static unsigned long
2940 size_of_locs (dw_loc_descr_ref loc)
2944 for (size = 0; loc != NULL; loc = loc->dw_loc_next)
2946 loc->dw_loc_addr = size;
2947 size += size_of_loc_descr (loc);
2953 /* Output location description stack opcode's operands (if any). */
2956 output_loc_operands (dw_loc_descr_ref loc)
2958 dw_val_ref val1 = &loc->dw_loc_oprnd1;
2959 dw_val_ref val2 = &loc->dw_loc_oprnd2;
2961 switch (loc->dw_loc_opc)
2963 #ifdef DWARF2_DEBUGGING_INFO
2965 dw2_asm_output_addr_rtx (DWARF2_ADDR_SIZE, val1->v.val_addr, NULL);
2969 dw2_asm_output_data (2, val1->v.val_int, NULL);
2973 dw2_asm_output_data (4, val1->v.val_int, NULL);
2977 if (HOST_BITS_PER_LONG < 64)
2979 dw2_asm_output_data (8, val1->v.val_int, NULL);
2986 if (val1->val_class == dw_val_class_loc)
2987 offset = val1->v.val_loc->dw_loc_addr - (loc->dw_loc_addr + 3);
2991 dw2_asm_output_data (2, offset, NULL);
3004 /* We currently don't make any attempt to make sure these are
3005 aligned properly like we do for the main unwind info, so
3006 don't support emitting things larger than a byte if we're
3007 only doing unwinding. */
3012 dw2_asm_output_data (1, val1->v.val_int, NULL);
3015 dw2_asm_output_data_uleb128 (val1->v.val_unsigned, NULL);
3018 dw2_asm_output_data_sleb128 (val1->v.val_int, NULL);
3021 dw2_asm_output_data (1, val1->v.val_int, NULL);
3023 case DW_OP_plus_uconst:
3024 dw2_asm_output_data_uleb128 (val1->v.val_unsigned, NULL);
3058 dw2_asm_output_data_sleb128 (val1->v.val_int, NULL);
3061 dw2_asm_output_data_uleb128 (val1->v.val_unsigned, NULL);
3064 dw2_asm_output_data_sleb128 (val1->v.val_int, NULL);
3067 dw2_asm_output_data_uleb128 (val1->v.val_unsigned, NULL);
3068 dw2_asm_output_data_sleb128 (val2->v.val_int, NULL);
3071 dw2_asm_output_data_uleb128 (val1->v.val_unsigned, NULL);
3073 case DW_OP_deref_size:
3074 case DW_OP_xderef_size:
3075 dw2_asm_output_data (1, val1->v.val_int, NULL);
3078 case INTERNAL_DW_OP_tls_addr:
3079 #ifdef ASM_OUTPUT_DWARF_DTPREL
3080 ASM_OUTPUT_DWARF_DTPREL (asm_out_file, DWARF2_ADDR_SIZE,
3082 fputc ('\n', asm_out_file);
3089 /* Other codes have no operands. */
3094 /* Output a sequence of location operations. */
3097 output_loc_sequence (dw_loc_descr_ref loc)
3099 for (; loc != NULL; loc = loc->dw_loc_next)
3101 /* Output the opcode. */
3102 dw2_asm_output_data (1, loc->dw_loc_opc,
3103 "%s", dwarf_stack_op_name (loc->dw_loc_opc));
3105 /* Output the operand(s) (if any). */
3106 output_loc_operands (loc);
3110 /* This routine will generate the correct assembly data for a location
3111 description based on a cfi entry with a complex address. */
3114 output_cfa_loc (dw_cfi_ref cfi)
3116 dw_loc_descr_ref loc;
3119 /* Output the size of the block. */
3120 loc = cfi->dw_cfi_oprnd1.dw_cfi_loc;
3121 size = size_of_locs (loc);
3122 dw2_asm_output_data_uleb128 (size, NULL);
3124 /* Now output the operations themselves. */
3125 output_loc_sequence (loc);
3128 /* This function builds a dwarf location descriptor sequence from
3129 a dw_cfa_location. */
3131 static struct dw_loc_descr_struct *
3132 build_cfa_loc (dw_cfa_location *cfa)
3134 struct dw_loc_descr_struct *head, *tmp;
3136 if (cfa->indirect == 0)
3139 if (cfa->base_offset)
3142 head = new_loc_descr (DW_OP_breg0 + cfa->reg, cfa->base_offset, 0);
3144 head = new_loc_descr (DW_OP_bregx, cfa->reg, cfa->base_offset);
3146 else if (cfa->reg <= 31)
3147 head = new_loc_descr (DW_OP_reg0 + cfa->reg, 0, 0);
3149 head = new_loc_descr (DW_OP_regx, cfa->reg, 0);
3151 head->dw_loc_oprnd1.val_class = dw_val_class_const;
3152 tmp = new_loc_descr (DW_OP_deref, 0, 0);
3153 add_loc_descr (&head, tmp);
3154 if (cfa->offset != 0)
3156 tmp = new_loc_descr (DW_OP_plus_uconst, cfa->offset, 0);
3157 add_loc_descr (&head, tmp);
3163 /* This function fills in aa dw_cfa_location structure from a dwarf location
3164 descriptor sequence. */
3167 get_cfa_from_loc_descr (dw_cfa_location *cfa, struct dw_loc_descr_struct *loc)
3169 struct dw_loc_descr_struct *ptr;
3171 cfa->base_offset = 0;
3175 for (ptr = loc; ptr != NULL; ptr = ptr->dw_loc_next)
3177 enum dwarf_location_atom op = ptr->dw_loc_opc;
3213 cfa->reg = op - DW_OP_reg0;
3216 cfa->reg = ptr->dw_loc_oprnd1.v.val_int;
3250 cfa->reg = op - DW_OP_breg0;
3251 cfa->base_offset = ptr->dw_loc_oprnd1.v.val_int;
3254 cfa->reg = ptr->dw_loc_oprnd1.v.val_int;
3255 cfa->base_offset = ptr->dw_loc_oprnd2.v.val_int;
3260 case DW_OP_plus_uconst:
3261 cfa->offset = ptr->dw_loc_oprnd1.v.val_unsigned;
3264 internal_error ("DW_LOC_OP %s not implemented\n",
3265 dwarf_stack_op_name (ptr->dw_loc_opc));
3269 #endif /* .debug_frame support */
3271 /* And now, the support for symbolic debugging information. */
3272 #ifdef DWARF2_DEBUGGING_INFO
3274 /* .debug_str support. */
3275 static int output_indirect_string (void **, void *);
3277 static void dwarf2out_init (const char *);
3278 static void dwarf2out_finish (const char *);
3279 static void dwarf2out_define (unsigned int, const char *);
3280 static void dwarf2out_undef (unsigned int, const char *);
3281 static void dwarf2out_start_source_file (unsigned, const char *);
3282 static void dwarf2out_end_source_file (unsigned);
3283 static void dwarf2out_begin_block (unsigned, unsigned);
3284 static void dwarf2out_end_block (unsigned, unsigned);
3285 static bool dwarf2out_ignore_block (tree);
3286 static void dwarf2out_global_decl (tree);
3287 static void dwarf2out_type_decl (tree, int);
3288 static void dwarf2out_imported_module_or_decl (tree, tree);
3289 static void dwarf2out_abstract_function (tree);
3290 static void dwarf2out_var_location (rtx);
3291 static void dwarf2out_begin_function (tree);
3293 /* The debug hooks structure. */
3295 const struct gcc_debug_hooks dwarf2_debug_hooks =
3301 dwarf2out_start_source_file,
3302 dwarf2out_end_source_file,
3303 dwarf2out_begin_block,
3304 dwarf2out_end_block,
3305 dwarf2out_ignore_block,
3306 dwarf2out_source_line,
3307 dwarf2out_begin_prologue,
3308 debug_nothing_int_charstar, /* end_prologue */
3309 dwarf2out_end_epilogue,
3310 dwarf2out_begin_function,
3311 debug_nothing_int, /* end_function */
3312 dwarf2out_decl, /* function_decl */
3313 dwarf2out_global_decl,
3314 dwarf2out_type_decl, /* type_decl */
3315 dwarf2out_imported_module_or_decl,
3316 debug_nothing_tree, /* deferred_inline_function */
3317 /* The DWARF 2 backend tries to reduce debugging bloat by not
3318 emitting the abstract description of inline functions until
3319 something tries to reference them. */
3320 dwarf2out_abstract_function, /* outlining_inline_function */
3321 debug_nothing_rtx, /* label */
3322 debug_nothing_int, /* handle_pch */
3323 dwarf2out_var_location
3327 /* NOTE: In the comments in this file, many references are made to
3328 "Debugging Information Entries". This term is abbreviated as `DIE'
3329 throughout the remainder of this file. */
3331 /* An internal representation of the DWARF output is built, and then
3332 walked to generate the DWARF debugging info. The walk of the internal
3333 representation is done after the entire program has been compiled.
3334 The types below are used to describe the internal representation. */
3336 /* Various DIE's use offsets relative to the beginning of the
3337 .debug_info section to refer to each other. */
3339 typedef long int dw_offset;
3341 /* Define typedefs here to avoid circular dependencies. */
3343 typedef struct dw_attr_struct *dw_attr_ref;
3344 typedef struct dw_line_info_struct *dw_line_info_ref;
3345 typedef struct dw_separate_line_info_struct *dw_separate_line_info_ref;
3346 typedef struct pubname_struct *pubname_ref;
3347 typedef struct dw_ranges_struct *dw_ranges_ref;
3349 /* Each entry in the line_info_table maintains the file and
3350 line number associated with the label generated for that
3351 entry. The label gives the PC value associated with
3352 the line number entry. */
3354 typedef struct dw_line_info_struct GTY(())
3356 unsigned long dw_file_num;
3357 unsigned long dw_line_num;
3361 /* Line information for functions in separate sections; each one gets its
3363 typedef struct dw_separate_line_info_struct GTY(())
3365 unsigned long dw_file_num;
3366 unsigned long dw_line_num;
3367 unsigned long function;
3369 dw_separate_line_info_entry;
3371 /* Each DIE attribute has a field specifying the attribute kind,
3372 a link to the next attribute in the chain, and an attribute value.
3373 Attributes are typically linked below the DIE they modify. */
3375 typedef struct dw_attr_struct GTY(())
3377 enum dwarf_attribute dw_attr;
3378 dw_attr_ref dw_attr_next;
3379 dw_val_node dw_attr_val;
3383 /* The Debugging Information Entry (DIE) structure */
3385 typedef struct die_struct GTY(())
3387 enum dwarf_tag die_tag;
3389 dw_attr_ref die_attr;
3390 dw_die_ref die_parent;
3391 dw_die_ref die_child;
3393 dw_die_ref die_definition; /* ref from a specification to its definition */
3394 dw_offset die_offset;
3395 unsigned long die_abbrev;
3397 unsigned int decl_id;
3401 /* The pubname structure */
3403 typedef struct pubname_struct GTY(())
3410 struct dw_ranges_struct GTY(())
3415 /* The limbo die list structure. */
3416 typedef struct limbo_die_struct GTY(())
3420 struct limbo_die_struct *next;
3424 /* How to start an assembler comment. */
3425 #ifndef ASM_COMMENT_START
3426 #define ASM_COMMENT_START ";#"
3429 /* Define a macro which returns nonzero for a TYPE_DECL which was
3430 implicitly generated for a tagged type.
3432 Note that unlike the gcc front end (which generates a NULL named
3433 TYPE_DECL node for each complete tagged type, each array type, and
3434 each function type node created) the g++ front end generates a
3435 _named_ TYPE_DECL node for each tagged type node created.
3436 These TYPE_DECLs have DECL_ARTIFICIAL set, so we know not to
3437 generate a DW_TAG_typedef DIE for them. */
3439 #define TYPE_DECL_IS_STUB(decl) \
3440 (DECL_NAME (decl) == NULL_TREE \
3441 || (DECL_ARTIFICIAL (decl) \
3442 && is_tagged_type (TREE_TYPE (decl)) \
3443 && ((decl == TYPE_STUB_DECL (TREE_TYPE (decl))) \
3444 /* This is necessary for stub decls that \
3445 appear in nested inline functions. */ \
3446 || (DECL_ABSTRACT_ORIGIN (decl) != NULL_TREE \
3447 && (decl_ultimate_origin (decl) \
3448 == TYPE_STUB_DECL (TREE_TYPE (decl)))))))
3450 /* Information concerning the compilation unit's programming
3451 language, and compiler version. */
3453 /* Fixed size portion of the DWARF compilation unit header. */
3454 #define DWARF_COMPILE_UNIT_HEADER_SIZE \
3455 (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 3)
3457 /* Fixed size portion of public names info. */
3458 #define DWARF_PUBNAMES_HEADER_SIZE (2 * DWARF_OFFSET_SIZE + 2)
3460 /* Fixed size portion of the address range info. */
3461 #define DWARF_ARANGES_HEADER_SIZE \
3462 (DWARF_ROUND (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 4, \
3463 DWARF2_ADDR_SIZE * 2) \
3464 - DWARF_INITIAL_LENGTH_SIZE)
3466 /* Size of padding portion in the address range info. It must be
3467 aligned to twice the pointer size. */
3468 #define DWARF_ARANGES_PAD_SIZE \
3469 (DWARF_ROUND (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 4, \
3470 DWARF2_ADDR_SIZE * 2) \
3471 - (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 4))
3473 /* Use assembler line directives if available. */
3474 #ifndef DWARF2_ASM_LINE_DEBUG_INFO
3475 #ifdef HAVE_AS_DWARF2_DEBUG_LINE
3476 #define DWARF2_ASM_LINE_DEBUG_INFO 1
3478 #define DWARF2_ASM_LINE_DEBUG_INFO 0
3482 /* Minimum line offset in a special line info. opcode.
3483 This value was chosen to give a reasonable range of values. */
3484 #define DWARF_LINE_BASE -10
3486 /* First special line opcode - leave room for the standard opcodes. */
3487 #define DWARF_LINE_OPCODE_BASE 10
3489 /* Range of line offsets in a special line info. opcode. */
3490 #define DWARF_LINE_RANGE (254-DWARF_LINE_OPCODE_BASE+1)
3492 /* Flag that indicates the initial value of the is_stmt_start flag.
3493 In the present implementation, we do not mark any lines as
3494 the beginning of a source statement, because that information
3495 is not made available by the GCC front-end. */
3496 #define DWARF_LINE_DEFAULT_IS_STMT_START 1
3498 #ifdef DWARF2_DEBUGGING_INFO
3499 /* This location is used by calc_die_sizes() to keep track
3500 the offset of each DIE within the .debug_info section. */
3501 static unsigned long next_die_offset;
3504 /* Record the root of the DIE's built for the current compilation unit. */
3505 static GTY(()) dw_die_ref comp_unit_die;
3507 /* A list of DIEs with a NULL parent waiting to be relocated. */
3508 static GTY(()) limbo_die_node *limbo_die_list;
3510 /* Filenames referenced by this compilation unit. */
3511 static GTY(()) varray_type file_table;
3512 static GTY(()) varray_type file_table_emitted;
3513 static GTY(()) size_t file_table_last_lookup_index;
3515 /* A hash table of references to DIE's that describe declarations.
3516 The key is a DECL_UID() which is a unique number identifying each decl. */
3517 static GTY ((param_is (struct die_struct))) htab_t decl_die_table;
3519 /* Node of the variable location list. */
3520 struct var_loc_node GTY ((chain_next ("%h.next")))
3522 rtx GTY (()) var_loc_note;
3523 const char * GTY (()) label;
3524 struct var_loc_node * GTY (()) next;
3527 /* Variable location list. */
3528 struct var_loc_list_def GTY (())
3530 struct var_loc_node * GTY (()) first;
3532 /* Do not mark the last element of the chained list because
3533 it is marked through the chain. */
3534 struct var_loc_node * GTY ((skip ("%h"))) last;
3536 /* DECL_UID of the variable decl. */
3537 unsigned int decl_id;
3539 typedef struct var_loc_list_def var_loc_list;
3542 /* Table of decl location linked lists. */
3543 static GTY ((param_is (var_loc_list))) htab_t decl_loc_table;
3545 /* A pointer to the base of a list of references to DIE's that
3546 are uniquely identified by their tag, presence/absence of
3547 children DIE's, and list of attribute/value pairs. */
3548 static GTY((length ("abbrev_die_table_allocated")))
3549 dw_die_ref *abbrev_die_table;
3551 /* Number of elements currently allocated for abbrev_die_table. */
3552 static GTY(()) unsigned abbrev_die_table_allocated;
3554 /* Number of elements in type_die_table currently in use. */
3555 static GTY(()) unsigned abbrev_die_table_in_use;
3557 /* Size (in elements) of increments by which we may expand the
3558 abbrev_die_table. */
3559 #define ABBREV_DIE_TABLE_INCREMENT 256
3561 /* A pointer to the base of a table that contains line information
3562 for each source code line in .text in the compilation unit. */
3563 static GTY((length ("line_info_table_allocated")))
3564 dw_line_info_ref line_info_table;
3566 /* Number of elements currently allocated for line_info_table. */
3567 static GTY(()) unsigned line_info_table_allocated;
3569 /* Number of elements in line_info_table currently in use. */
3570 static GTY(()) unsigned line_info_table_in_use;
3572 /* A pointer to the base of a table that contains line information
3573 for each source code line outside of .text in the compilation unit. */
3574 static GTY ((length ("separate_line_info_table_allocated")))
3575 dw_separate_line_info_ref separate_line_info_table;
3577 /* Number of elements currently allocated for separate_line_info_table. */
3578 static GTY(()) unsigned separate_line_info_table_allocated;
3580 /* Number of elements in separate_line_info_table currently in use. */
3581 static GTY(()) unsigned separate_line_info_table_in_use;
3583 /* Size (in elements) of increments by which we may expand the
3585 #define LINE_INFO_TABLE_INCREMENT 1024
3587 /* A pointer to the base of a table that contains a list of publicly
3588 accessible names. */
3589 static GTY ((length ("pubname_table_allocated"))) pubname_ref pubname_table;
3591 /* Number of elements currently allocated for pubname_table. */
3592 static GTY(()) unsigned pubname_table_allocated;
3594 /* Number of elements in pubname_table currently in use. */
3595 static GTY(()) unsigned pubname_table_in_use;
3597 /* Size (in elements) of increments by which we may expand the
3599 #define PUBNAME_TABLE_INCREMENT 64
3601 /* Array of dies for which we should generate .debug_arange info. */
3602 static GTY((length ("arange_table_allocated"))) dw_die_ref *arange_table;
3604 /* Number of elements currently allocated for arange_table. */
3605 static GTY(()) unsigned arange_table_allocated;
3607 /* Number of elements in arange_table currently in use. */
3608 static GTY(()) unsigned arange_table_in_use;
3610 /* Size (in elements) of increments by which we may expand the
3612 #define ARANGE_TABLE_INCREMENT 64
3614 /* Array of dies for which we should generate .debug_ranges info. */
3615 static GTY ((length ("ranges_table_allocated"))) dw_ranges_ref ranges_table;
3617 /* Number of elements currently allocated for ranges_table. */
3618 static GTY(()) unsigned ranges_table_allocated;
3620 /* Number of elements in ranges_table currently in use. */
3621 static GTY(()) unsigned ranges_table_in_use;
3623 /* Size (in elements) of increments by which we may expand the
3625 #define RANGES_TABLE_INCREMENT 64
3627 /* Whether we have location lists that need outputting */
3628 static GTY(()) unsigned have_location_lists;
3630 /* Unique label counter. */
3631 static GTY(()) unsigned int loclabel_num;
3633 #ifdef DWARF2_DEBUGGING_INFO
3634 /* Record whether the function being analyzed contains inlined functions. */
3635 static int current_function_has_inlines;
3637 #if 0 && defined (MIPS_DEBUGGING_INFO)
3638 static int comp_unit_has_inlines;
3641 /* Number of file tables emitted in maybe_emit_file(). */
3642 static GTY(()) int emitcount = 0;
3644 /* Number of internal labels generated by gen_internal_sym(). */
3645 static GTY(()) int label_num;
3647 #ifdef DWARF2_DEBUGGING_INFO
3649 /* Forward declarations for functions defined in this file. */
3651 static int is_pseudo_reg (rtx);
3652 static tree type_main_variant (tree);
3653 static int is_tagged_type (tree);
3654 static const char *dwarf_tag_name (unsigned);
3655 static const char *dwarf_attr_name (unsigned);
3656 static const char *dwarf_form_name (unsigned);
3658 static const char *dwarf_type_encoding_name (unsigned);
3660 static tree decl_ultimate_origin (tree);
3661 static tree block_ultimate_origin (tree);
3662 static tree decl_class_context (tree);
3663 static void add_dwarf_attr (dw_die_ref, dw_attr_ref);
3664 static inline enum dw_val_class AT_class (dw_attr_ref);
3665 static void add_AT_flag (dw_die_ref, enum dwarf_attribute, unsigned);
3666 static inline unsigned AT_flag (dw_attr_ref);
3667 static void add_AT_int (dw_die_ref, enum dwarf_attribute, HOST_WIDE_INT);
3668 static inline HOST_WIDE_INT AT_int (dw_attr_ref);
3669 static void add_AT_unsigned (dw_die_ref, enum dwarf_attribute, unsigned HOST_WIDE_INT);
3670 static inline unsigned HOST_WIDE_INT AT_unsigned (dw_attr_ref);
3671 static void add_AT_long_long (dw_die_ref, enum dwarf_attribute, unsigned long,
3673 static inline void add_AT_vec (dw_die_ref, enum dwarf_attribute, unsigned int,
3674 unsigned int, unsigned char *);
3675 static hashval_t debug_str_do_hash (const void *);
3676 static int debug_str_eq (const void *, const void *);
3677 static void add_AT_string (dw_die_ref, enum dwarf_attribute, const char *);
3678 static inline const char *AT_string (dw_attr_ref);
3679 static int AT_string_form (dw_attr_ref);
3680 static void add_AT_die_ref (dw_die_ref, enum dwarf_attribute, dw_die_ref);
3681 static void add_AT_specification (dw_die_ref, dw_die_ref);
3682 static inline dw_die_ref AT_ref (dw_attr_ref);
3683 static inline int AT_ref_external (dw_attr_ref);
3684 static inline void set_AT_ref_external (dw_attr_ref, int);
3685 static void add_AT_fde_ref (dw_die_ref, enum dwarf_attribute, unsigned);
3686 static void add_AT_loc (dw_die_ref, enum dwarf_attribute, dw_loc_descr_ref);
3687 static inline dw_loc_descr_ref AT_loc (dw_attr_ref);
3688 static void add_AT_loc_list (dw_die_ref, enum dwarf_attribute,
3690 static inline dw_loc_list_ref AT_loc_list (dw_attr_ref);
3691 static void add_AT_addr (dw_die_ref, enum dwarf_attribute, rtx);
3692 static inline rtx AT_addr (dw_attr_ref);
3693 static void add_AT_lbl_id (dw_die_ref, enum dwarf_attribute, const char *);
3694 static void add_AT_lbl_offset (dw_die_ref, enum dwarf_attribute, const char *);
3695 static void add_AT_offset (dw_die_ref, enum dwarf_attribute,
3696 unsigned HOST_WIDE_INT);
3697 static void add_AT_range_list (dw_die_ref, enum dwarf_attribute,
3699 static inline const char *AT_lbl (dw_attr_ref);
3700 static dw_attr_ref get_AT (dw_die_ref, enum dwarf_attribute);
3701 static const char *get_AT_low_pc (dw_die_ref);
3702 static const char *get_AT_hi_pc (dw_die_ref);
3703 static const char *get_AT_string (dw_die_ref, enum dwarf_attribute);
3704 static int get_AT_flag (dw_die_ref, enum dwarf_attribute);
3705 static unsigned get_AT_unsigned (dw_die_ref, enum dwarf_attribute);
3706 static inline dw_die_ref get_AT_ref (dw_die_ref, enum dwarf_attribute);
3707 static bool is_c_family (void);
3708 static bool is_cxx (void);
3709 static bool is_java (void);
3710 static bool is_fortran (void);
3711 static bool is_ada (void);
3712 static void remove_AT (dw_die_ref, enum dwarf_attribute);
3713 static void remove_child_TAG (dw_die_ref, enum dwarf_tag);
3714 static inline void free_die (dw_die_ref);
3715 static void remove_children (dw_die_ref);
3716 static void add_child_die (dw_die_ref, dw_die_ref);
3717 static dw_die_ref new_die (enum dwarf_tag, dw_die_ref, tree);
3718 static dw_die_ref lookup_type_die (tree);
3719 static void equate_type_number_to_die (tree, dw_die_ref);
3720 static hashval_t decl_die_table_hash (const void *);
3721 static int decl_die_table_eq (const void *, const void *);
3722 static dw_die_ref lookup_decl_die (tree);
3723 static hashval_t decl_loc_table_hash (const void *);
3724 static int decl_loc_table_eq (const void *, const void *);
3725 static var_loc_list *lookup_decl_loc (tree);
3726 static void equate_decl_number_to_die (tree, dw_die_ref);
3727 static void add_var_loc_to_decl (tree, struct var_loc_node *);
3728 static void print_spaces (FILE *);
3729 static void print_die (dw_die_ref, FILE *);
3730 static void print_dwarf_line_table (FILE *);
3731 static void reverse_die_lists (dw_die_ref);
3732 static void reverse_all_dies (dw_die_ref);
3733 static dw_die_ref push_new_compile_unit (dw_die_ref, dw_die_ref);
3734 static dw_die_ref pop_compile_unit (dw_die_ref);
3735 static void loc_checksum (dw_loc_descr_ref, struct md5_ctx *);
3736 static void attr_checksum (dw_attr_ref, struct md5_ctx *, int *);
3737 static void die_checksum (dw_die_ref, struct md5_ctx *, int *);
3738 static int same_loc_p (dw_loc_descr_ref, dw_loc_descr_ref, int *);
3739 static int same_dw_val_p (dw_val_node *, dw_val_node *, int *);
3740 static int same_attr_p (dw_attr_ref, dw_attr_ref, int *);
3741 static int same_die_p (dw_die_ref, dw_die_ref, int *);
3742 static int same_die_p_wrap (dw_die_ref, dw_die_ref);
3743 static void compute_section_prefix (dw_die_ref);
3744 static int is_type_die (dw_die_ref);
3745 static int is_comdat_die (dw_die_ref);
3746 static int is_symbol_die (dw_die_ref);
3747 static void assign_symbol_names (dw_die_ref);
3748 static void break_out_includes (dw_die_ref);
3749 static hashval_t htab_cu_hash (const void *);
3750 static int htab_cu_eq (const void *, const void *);
3751 static void htab_cu_del (void *);
3752 static int check_duplicate_cu (dw_die_ref, htab_t, unsigned *);
3753 static void record_comdat_symbol_number (dw_die_ref, htab_t, unsigned);
3754 static void add_sibling_attributes (dw_die_ref);
3755 static void build_abbrev_table (dw_die_ref);
3756 static void output_location_lists (dw_die_ref);
3757 static int constant_size (long unsigned);
3758 static unsigned long size_of_die (dw_die_ref);
3759 static void calc_die_sizes (dw_die_ref);
3760 static void mark_dies (dw_die_ref);
3761 static void unmark_dies (dw_die_ref);
3762 static void unmark_all_dies (dw_die_ref);
3763 static unsigned long size_of_pubnames (void);
3764 static unsigned long size_of_aranges (void);
3765 static enum dwarf_form value_format (dw_attr_ref);
3766 static void output_value_format (dw_attr_ref);
3767 static void output_abbrev_section (void);
3768 static void output_die_symbol (dw_die_ref);
3769 static void output_die (dw_die_ref);
3770 static void output_compilation_unit_header (void);
3771 static void output_comp_unit (dw_die_ref, int);
3772 static const char *dwarf2_name (tree, int);
3773 static void add_pubname (tree, dw_die_ref);
3774 static void output_pubnames (void);
3775 static void add_arange (tree, dw_die_ref);
3776 static void output_aranges (void);
3777 static unsigned int add_ranges (tree);
3778 static void output_ranges (void);
3779 static void output_line_info (void);
3780 static void output_file_names (void);
3781 static dw_die_ref base_type_die (tree);
3782 static tree root_type (tree);
3783 static int is_base_type (tree);
3784 static bool is_subrange_type (tree);
3785 static dw_die_ref subrange_type_die (tree, dw_die_ref);
3786 static dw_die_ref modified_type_die (tree, int, int, dw_die_ref);
3787 static int type_is_enum (tree);
3788 static unsigned int reg_number (rtx);
3789 static dw_loc_descr_ref reg_loc_descriptor (rtx);
3790 static dw_loc_descr_ref one_reg_loc_descriptor (unsigned int);
3791 static dw_loc_descr_ref multiple_reg_loc_descriptor (rtx, rtx);
3792 static dw_loc_descr_ref int_loc_descriptor (HOST_WIDE_INT);
3793 static dw_loc_descr_ref based_loc_descr (unsigned, HOST_WIDE_INT, bool);
3794 static int is_based_loc (rtx);
3795 static dw_loc_descr_ref mem_loc_descriptor (rtx, enum machine_mode mode, bool);
3796 static dw_loc_descr_ref concat_loc_descriptor (rtx, rtx);
3797 static dw_loc_descr_ref loc_descriptor (rtx, bool);
3798 static dw_loc_descr_ref loc_descriptor_from_tree (tree, int);
3799 static HOST_WIDE_INT ceiling (HOST_WIDE_INT, unsigned int);
3800 static tree field_type (tree);
3801 static unsigned int simple_type_align_in_bits (tree);
3802 static unsigned int simple_decl_align_in_bits (tree);
3803 static unsigned HOST_WIDE_INT simple_type_size_in_bits (tree);
3804 static HOST_WIDE_INT field_byte_offset (tree);
3805 static void add_AT_location_description (dw_die_ref, enum dwarf_attribute,
3807 static void add_data_member_location_attribute (dw_die_ref, tree);
3808 static void add_const_value_attribute (dw_die_ref, rtx);
3809 static void insert_int (HOST_WIDE_INT, unsigned, unsigned char *);
3810 static HOST_WIDE_INT extract_int (const unsigned char *, unsigned);
3811 static void insert_float (rtx, unsigned char *);
3812 static rtx rtl_for_decl_location (tree);
3813 static void add_location_or_const_value_attribute (dw_die_ref, tree,
3814 enum dwarf_attribute);
3815 static void tree_add_const_value_attribute (dw_die_ref, tree);
3816 static void add_name_attribute (dw_die_ref, const char *);
3817 static void add_comp_dir_attribute (dw_die_ref);
3818 static void add_bound_info (dw_die_ref, enum dwarf_attribute, tree);
3819 static void add_subscript_info (dw_die_ref, tree);
3820 static void add_byte_size_attribute (dw_die_ref, tree);
3821 static void add_bit_offset_attribute (dw_die_ref, tree);
3822 static void add_bit_size_attribute (dw_die_ref, tree);
3823 static void add_prototyped_attribute (dw_die_ref, tree);
3824 static void add_abstract_origin_attribute (dw_die_ref, tree);
3825 static void add_pure_or_virtual_attribute (dw_die_ref, tree);
3826 static void add_src_coords_attributes (dw_die_ref, tree);
3827 static void add_name_and_src_coords_attributes (dw_die_ref, tree);
3828 static void push_decl_scope (tree);
3829 static void pop_decl_scope (void);
3830 static dw_die_ref scope_die_for (tree, dw_die_ref);
3831 static inline int local_scope_p (dw_die_ref);
3832 static inline int class_or_namespace_scope_p (dw_die_ref);
3833 static void add_type_attribute (dw_die_ref, tree, int, int, dw_die_ref);
3834 static const char *type_tag (tree);
3835 static tree member_declared_type (tree);
3837 static const char *decl_start_label (tree);
3839 static void gen_array_type_die (tree, dw_die_ref);
3840 static void gen_set_type_die (tree, dw_die_ref);
3842 static void gen_entry_point_die (tree, dw_die_ref);
3844 static void gen_inlined_enumeration_type_die (tree, dw_die_ref);
3845 static void gen_inlined_structure_type_die (tree, dw_die_ref);
3846 static void gen_inlined_union_type_die (tree, dw_die_ref);
3847 static dw_die_ref gen_enumeration_type_die (tree, dw_die_ref);
3848 static dw_die_ref gen_formal_parameter_die (tree, dw_die_ref);
3849 static void gen_unspecified_parameters_die (tree, dw_die_ref);
3850 static void gen_formal_types_die (tree, dw_die_ref);
3851 static void gen_subprogram_die (tree, dw_die_ref);
3852 static void gen_variable_die (tree, dw_die_ref);
3853 static void gen_label_die (tree, dw_die_ref);
3854 static void gen_lexical_block_die (tree, dw_die_ref, int);
3855 static void gen_inlined_subroutine_die (tree, dw_die_ref, int);
3856 static void gen_field_die (tree, dw_die_ref);
3857 static void gen_ptr_to_mbr_type_die (tree, dw_die_ref);
3858 static dw_die_ref gen_compile_unit_die (const char *);
3859 static void gen_string_type_die (tree, dw_die_ref);
3860 static void gen_inheritance_die (tree, tree, dw_die_ref);
3861 static void gen_member_die (tree, dw_die_ref);
3862 static void gen_struct_or_union_type_die (tree, dw_die_ref);
3863 static void gen_subroutine_type_die (tree, dw_die_ref);
3864 static void gen_typedef_die (tree, dw_die_ref);
3865 static void gen_type_die (tree, dw_die_ref);
3866 static void gen_tagged_type_instantiation_die (tree, dw_die_ref);
3867 static void gen_block_die (tree, dw_die_ref, int);
3868 static void decls_for_scope (tree, dw_die_ref, int);
3869 static int is_redundant_typedef (tree);
3870 static void gen_namespace_die (tree);
3871 static void gen_decl_die (tree, dw_die_ref);
3872 static dw_die_ref force_decl_die (tree);
3873 static dw_die_ref force_type_die (tree);
3874 static dw_die_ref setup_namespace_context (tree, dw_die_ref);
3875 static void declare_in_namespace (tree, dw_die_ref);
3876 static unsigned lookup_filename (const char *);
3877 static void init_file_table (void);
3878 static void retry_incomplete_types (void);
3879 static void gen_type_die_for_member (tree, tree, dw_die_ref);
3880 static void splice_child_die (dw_die_ref, dw_die_ref);
3881 static int file_info_cmp (const void *, const void *);
3882 static dw_loc_list_ref new_loc_list (dw_loc_descr_ref, const char *,
3883 const char *, const char *, unsigned);
3884 static void add_loc_descr_to_loc_list (dw_loc_list_ref *, dw_loc_descr_ref,
3885 const char *, const char *,
3887 static void output_loc_list (dw_loc_list_ref);
3888 static char *gen_internal_sym (const char *);
3890 static void prune_unmark_dies (dw_die_ref);
3891 static void prune_unused_types_mark (dw_die_ref, int);
3892 static void prune_unused_types_walk (dw_die_ref);
3893 static void prune_unused_types_walk_attribs (dw_die_ref);
3894 static void prune_unused_types_prune (dw_die_ref);
3895 static void prune_unused_types (void);
3896 static int maybe_emit_file (int);
3898 /* Section names used to hold DWARF debugging information. */
3899 #ifndef DEBUG_INFO_SECTION
3900 #define DEBUG_INFO_SECTION ".debug_info"
3902 #ifndef DEBUG_ABBREV_SECTION
3903 #define DEBUG_ABBREV_SECTION ".debug_abbrev"
3905 #ifndef DEBUG_ARANGES_SECTION
3906 #define DEBUG_ARANGES_SECTION ".debug_aranges"
3908 #ifndef DEBUG_MACINFO_SECTION
3909 #define DEBUG_MACINFO_SECTION ".debug_macinfo"
3911 #ifndef DEBUG_LINE_SECTION
3912 #define DEBUG_LINE_SECTION ".debug_line"
3914 #ifndef DEBUG_LOC_SECTION
3915 #define DEBUG_LOC_SECTION ".debug_loc"
3917 #ifndef DEBUG_PUBNAMES_SECTION
3918 #define DEBUG_PUBNAMES_SECTION ".debug_pubnames"
3920 #ifndef DEBUG_STR_SECTION
3921 #define DEBUG_STR_SECTION ".debug_str"
3923 #ifndef DEBUG_RANGES_SECTION
3924 #define DEBUG_RANGES_SECTION ".debug_ranges"
3927 /* Standard ELF section names for compiled code and data. */
3928 #ifndef TEXT_SECTION_NAME
3929 #define TEXT_SECTION_NAME ".text"
3932 /* Section flags for .debug_str section. */
3933 #define DEBUG_STR_SECTION_FLAGS \
3934 (HAVE_GAS_SHF_MERGE && flag_merge_constants \
3935 ? SECTION_DEBUG | SECTION_MERGE | SECTION_STRINGS | 1 \
3938 /* Labels we insert at beginning sections we can reference instead of
3939 the section names themselves. */
3941 #ifndef TEXT_SECTION_LABEL
3942 #define TEXT_SECTION_LABEL "Ltext"
3944 #ifndef DEBUG_LINE_SECTION_LABEL
3945 #define DEBUG_LINE_SECTION_LABEL "Ldebug_line"
3947 #ifndef DEBUG_INFO_SECTION_LABEL
3948 #define DEBUG_INFO_SECTION_LABEL "Ldebug_info"
3950 #ifndef DEBUG_ABBREV_SECTION_LABEL
3951 #define DEBUG_ABBREV_SECTION_LABEL "Ldebug_abbrev"
3953 #ifndef DEBUG_LOC_SECTION_LABEL
3954 #define DEBUG_LOC_SECTION_LABEL "Ldebug_loc"
3956 #ifndef DEBUG_RANGES_SECTION_LABEL
3957 #define DEBUG_RANGES_SECTION_LABEL "Ldebug_ranges"
3959 #ifndef DEBUG_MACINFO_SECTION_LABEL
3960 #define DEBUG_MACINFO_SECTION_LABEL "Ldebug_macinfo"
3963 /* Definitions of defaults for formats and names of various special
3964 (artificial) labels which may be generated within this file (when the -g
3965 options is used and DWARF2_DEBUGGING_INFO is in effect.
3966 If necessary, these may be overridden from within the tm.h file, but
3967 typically, overriding these defaults is unnecessary. */
3969 static char text_end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3970 static char text_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
3971 static char abbrev_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
3972 static char debug_info_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
3973 static char debug_line_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
3974 static char macinfo_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
3975 static char loc_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
3976 static char ranges_section_label[2 * MAX_ARTIFICIAL_LABEL_BYTES];
3978 #ifndef TEXT_END_LABEL
3979 #define TEXT_END_LABEL "Letext"
3981 #ifndef BLOCK_BEGIN_LABEL
3982 #define BLOCK_BEGIN_LABEL "LBB"
3984 #ifndef BLOCK_END_LABEL
3985 #define BLOCK_END_LABEL "LBE"
3987 #ifndef LINE_CODE_LABEL
3988 #define LINE_CODE_LABEL "LM"
3990 #ifndef SEPARATE_LINE_CODE_LABEL
3991 #define SEPARATE_LINE_CODE_LABEL "LSM"
3994 /* We allow a language front-end to designate a function that is to be
3995 called to "demangle" any name before it it put into a DIE. */
3997 static const char *(*demangle_name_func) (const char *);
4000 dwarf2out_set_demangle_name_func (const char *(*func) (const char *))
4002 demangle_name_func = func;
4005 /* Test if rtl node points to a pseudo register. */
4008 is_pseudo_reg (rtx rtl)
4010 return ((GET_CODE (rtl) == REG && REGNO (rtl) >= FIRST_PSEUDO_REGISTER)
4011 || (GET_CODE (rtl) == SUBREG
4012 && REGNO (SUBREG_REG (rtl)) >= FIRST_PSEUDO_REGISTER));
4015 /* Return a reference to a type, with its const and volatile qualifiers
4019 type_main_variant (tree type)
4021 type = TYPE_MAIN_VARIANT (type);
4023 /* ??? There really should be only one main variant among any group of
4024 variants of a given type (and all of the MAIN_VARIANT values for all
4025 members of the group should point to that one type) but sometimes the C
4026 front-end messes this up for array types, so we work around that bug
4028 if (TREE_CODE (type) == ARRAY_TYPE)
4029 while (type != TYPE_MAIN_VARIANT (type))
4030 type = TYPE_MAIN_VARIANT (type);
4035 /* Return nonzero if the given type node represents a tagged type. */
4038 is_tagged_type (tree type)
4040 enum tree_code code = TREE_CODE (type);
4042 return (code == RECORD_TYPE || code == UNION_TYPE
4043 || code == QUAL_UNION_TYPE || code == ENUMERAL_TYPE);
4046 /* Convert a DIE tag into its string name. */
4049 dwarf_tag_name (unsigned int tag)
4053 case DW_TAG_padding:
4054 return "DW_TAG_padding";
4055 case DW_TAG_array_type:
4056 return "DW_TAG_array_type";
4057 case DW_TAG_class_type:
4058 return "DW_TAG_class_type";
4059 case DW_TAG_entry_point:
4060 return "DW_TAG_entry_point";
4061 case DW_TAG_enumeration_type:
4062 return "DW_TAG_enumeration_type";
4063 case DW_TAG_formal_parameter:
4064 return "DW_TAG_formal_parameter";
4065 case DW_TAG_imported_declaration:
4066 return "DW_TAG_imported_declaration";
4068 return "DW_TAG_label";
4069 case DW_TAG_lexical_block:
4070 return "DW_TAG_lexical_block";
4072 return "DW_TAG_member";
4073 case DW_TAG_pointer_type:
4074 return "DW_TAG_pointer_type";
4075 case DW_TAG_reference_type:
4076 return "DW_TAG_reference_type";
4077 case DW_TAG_compile_unit:
4078 return "DW_TAG_compile_unit";
4079 case DW_TAG_string_type:
4080 return "DW_TAG_string_type";
4081 case DW_TAG_structure_type:
4082 return "DW_TAG_structure_type";
4083 case DW_TAG_subroutine_type:
4084 return "DW_TAG_subroutine_type";
4085 case DW_TAG_typedef:
4086 return "DW_TAG_typedef";
4087 case DW_TAG_union_type:
4088 return "DW_TAG_union_type";
4089 case DW_TAG_unspecified_parameters:
4090 return "DW_TAG_unspecified_parameters";
4091 case DW_TAG_variant:
4092 return "DW_TAG_variant";
4093 case DW_TAG_common_block:
4094 return "DW_TAG_common_block";
4095 case DW_TAG_common_inclusion:
4096 return "DW_TAG_common_inclusion";
4097 case DW_TAG_inheritance:
4098 return "DW_TAG_inheritance";
4099 case DW_TAG_inlined_subroutine:
4100 return "DW_TAG_inlined_subroutine";
4102 return "DW_TAG_module";
4103 case DW_TAG_ptr_to_member_type:
4104 return "DW_TAG_ptr_to_member_type";
4105 case DW_TAG_set_type:
4106 return "DW_TAG_set_type";
4107 case DW_TAG_subrange_type:
4108 return "DW_TAG_subrange_type";
4109 case DW_TAG_with_stmt:
4110 return "DW_TAG_with_stmt";
4111 case DW_TAG_access_declaration:
4112 return "DW_TAG_access_declaration";
4113 case DW_TAG_base_type:
4114 return "DW_TAG_base_type";
4115 case DW_TAG_catch_block:
4116 return "DW_TAG_catch_block";
4117 case DW_TAG_const_type:
4118 return "DW_TAG_const_type";
4119 case DW_TAG_constant:
4120 return "DW_TAG_constant";
4121 case DW_TAG_enumerator:
4122 return "DW_TAG_enumerator";
4123 case DW_TAG_file_type:
4124 return "DW_TAG_file_type";
4126 return "DW_TAG_friend";
4127 case DW_TAG_namelist:
4128 return "DW_TAG_namelist";
4129 case DW_TAG_namelist_item:
4130 return "DW_TAG_namelist_item";
4131 case DW_TAG_namespace:
4132 return "DW_TAG_namespace";
4133 case DW_TAG_packed_type:
4134 return "DW_TAG_packed_type";
4135 case DW_TAG_subprogram:
4136 return "DW_TAG_subprogram";
4137 case DW_TAG_template_type_param:
4138 return "DW_TAG_template_type_param";
4139 case DW_TAG_template_value_param:
4140 return "DW_TAG_template_value_param";
4141 case DW_TAG_thrown_type:
4142 return "DW_TAG_thrown_type";
4143 case DW_TAG_try_block:
4144 return "DW_TAG_try_block";
4145 case DW_TAG_variant_part:
4146 return "DW_TAG_variant_part";
4147 case DW_TAG_variable:
4148 return "DW_TAG_variable";
4149 case DW_TAG_volatile_type:
4150 return "DW_TAG_volatile_type";
4151 case DW_TAG_imported_module:
4152 return "DW_TAG_imported_module";
4153 case DW_TAG_MIPS_loop:
4154 return "DW_TAG_MIPS_loop";
4155 case DW_TAG_format_label:
4156 return "DW_TAG_format_label";
4157 case DW_TAG_function_template:
4158 return "DW_TAG_function_template";
4159 case DW_TAG_class_template:
4160 return "DW_TAG_class_template";
4161 case DW_TAG_GNU_BINCL:
4162 return "DW_TAG_GNU_BINCL";
4163 case DW_TAG_GNU_EINCL:
4164 return "DW_TAG_GNU_EINCL";
4166 return "DW_TAG_<unknown>";
4170 /* Convert a DWARF attribute code into its string name. */
4173 dwarf_attr_name (unsigned int attr)
4178 return "DW_AT_sibling";
4179 case DW_AT_location:
4180 return "DW_AT_location";
4182 return "DW_AT_name";
4183 case DW_AT_ordering:
4184 return "DW_AT_ordering";
4185 case DW_AT_subscr_data:
4186 return "DW_AT_subscr_data";
4187 case DW_AT_byte_size:
4188 return "DW_AT_byte_size";
4189 case DW_AT_bit_offset:
4190 return "DW_AT_bit_offset";
4191 case DW_AT_bit_size:
4192 return "DW_AT_bit_size";
4193 case DW_AT_element_list:
4194 return "DW_AT_element_list";
4195 case DW_AT_stmt_list:
4196 return "DW_AT_stmt_list";
4198 return "DW_AT_low_pc";
4200 return "DW_AT_high_pc";
4201 case DW_AT_language:
4202 return "DW_AT_language";
4204 return "DW_AT_member";
4206 return "DW_AT_discr";
4207 case DW_AT_discr_value:
4208 return "DW_AT_discr_value";
4209 case DW_AT_visibility:
4210 return "DW_AT_visibility";
4212 return "DW_AT_import";
4213 case DW_AT_string_length:
4214 return "DW_AT_string_length";
4215 case DW_AT_common_reference:
4216 return "DW_AT_common_reference";
4217 case DW_AT_comp_dir:
4218 return "DW_AT_comp_dir";
4219 case DW_AT_const_value:
4220 return "DW_AT_const_value";
4221 case DW_AT_containing_type:
4222 return "DW_AT_containing_type";
4223 case DW_AT_default_value:
4224 return "DW_AT_default_value";
4226 return "DW_AT_inline";
4227 case DW_AT_is_optional:
4228 return "DW_AT_is_optional";
4229 case DW_AT_lower_bound:
4230 return "DW_AT_lower_bound";
4231 case DW_AT_producer:
4232 return "DW_AT_producer";
4233 case DW_AT_prototyped:
4234 return "DW_AT_prototyped";
4235 case DW_AT_return_addr:
4236 return "DW_AT_return_addr";
4237 case DW_AT_start_scope:
4238 return "DW_AT_start_scope";
4239 case DW_AT_stride_size:
4240 return "DW_AT_stride_size";
4241 case DW_AT_upper_bound:
4242 return "DW_AT_upper_bound";
4243 case DW_AT_abstract_origin:
4244 return "DW_AT_abstract_origin";
4245 case DW_AT_accessibility:
4246 return "DW_AT_accessibility";
4247 case DW_AT_address_class:
4248 return "DW_AT_address_class";
4249 case DW_AT_artificial:
4250 return "DW_AT_artificial";
4251 case DW_AT_base_types:
4252 return "DW_AT_base_types";
4253 case DW_AT_calling_convention:
4254 return "DW_AT_calling_convention";
4256 return "DW_AT_count";
4257 case DW_AT_data_member_location:
4258 return "DW_AT_data_member_location";
4259 case DW_AT_decl_column:
4260 return "DW_AT_decl_column";
4261 case DW_AT_decl_file:
4262 return "DW_AT_decl_file";
4263 case DW_AT_decl_line:
4264 return "DW_AT_decl_line";
4265 case DW_AT_declaration:
4266 return "DW_AT_declaration";
4267 case DW_AT_discr_list:
4268 return "DW_AT_discr_list";
4269 case DW_AT_encoding:
4270 return "DW_AT_encoding";
4271 case DW_AT_external:
4272 return "DW_AT_external";
4273 case DW_AT_frame_base:
4274 return "DW_AT_frame_base";
4276 return "DW_AT_friend";
4277 case DW_AT_identifier_case:
4278 return "DW_AT_identifier_case";
4279 case DW_AT_macro_info:
4280 return "DW_AT_macro_info";
4281 case DW_AT_namelist_items:
4282 return "DW_AT_namelist_items";
4283 case DW_AT_priority:
4284 return "DW_AT_priority";
4286 return "DW_AT_segment";
4287 case DW_AT_specification:
4288 return "DW_AT_specification";
4289 case DW_AT_static_link:
4290 return "DW_AT_static_link";
4292 return "DW_AT_type";
4293 case DW_AT_use_location:
4294 return "DW_AT_use_location";
4295 case DW_AT_variable_parameter:
4296 return "DW_AT_variable_parameter";
4297 case DW_AT_virtuality:
4298 return "DW_AT_virtuality";
4299 case DW_AT_vtable_elem_location:
4300 return "DW_AT_vtable_elem_location";
4302 case DW_AT_allocated:
4303 return "DW_AT_allocated";
4304 case DW_AT_associated:
4305 return "DW_AT_associated";
4306 case DW_AT_data_location:
4307 return "DW_AT_data_location";
4309 return "DW_AT_stride";
4310 case DW_AT_entry_pc:
4311 return "DW_AT_entry_pc";
4312 case DW_AT_use_UTF8:
4313 return "DW_AT_use_UTF8";
4314 case DW_AT_extension:
4315 return "DW_AT_extension";
4317 return "DW_AT_ranges";
4318 case DW_AT_trampoline:
4319 return "DW_AT_trampoline";
4320 case DW_AT_call_column:
4321 return "DW_AT_call_column";
4322 case DW_AT_call_file:
4323 return "DW_AT_call_file";
4324 case DW_AT_call_line:
4325 return "DW_AT_call_line";
4327 case DW_AT_MIPS_fde:
4328 return "DW_AT_MIPS_fde";
4329 case DW_AT_MIPS_loop_begin:
4330 return "DW_AT_MIPS_loop_begin";
4331 case DW_AT_MIPS_tail_loop_begin:
4332 return "DW_AT_MIPS_tail_loop_begin";
4333 case DW_AT_MIPS_epilog_begin:
4334 return "DW_AT_MIPS_epilog_begin";
4335 case DW_AT_MIPS_loop_unroll_factor:
4336 return "DW_AT_MIPS_loop_unroll_factor";
4337 case DW_AT_MIPS_software_pipeline_depth:
4338 return "DW_AT_MIPS_software_pipeline_depth";
4339 case DW_AT_MIPS_linkage_name:
4340 return "DW_AT_MIPS_linkage_name";
4341 case DW_AT_MIPS_stride:
4342 return "DW_AT_MIPS_stride";
4343 case DW_AT_MIPS_abstract_name:
4344 return "DW_AT_MIPS_abstract_name";
4345 case DW_AT_MIPS_clone_origin:
4346 return "DW_AT_MIPS_clone_origin";
4347 case DW_AT_MIPS_has_inlines:
4348 return "DW_AT_MIPS_has_inlines";
4350 case DW_AT_sf_names:
4351 return "DW_AT_sf_names";
4352 case DW_AT_src_info:
4353 return "DW_AT_src_info";
4354 case DW_AT_mac_info:
4355 return "DW_AT_mac_info";
4356 case DW_AT_src_coords:
4357 return "DW_AT_src_coords";
4358 case DW_AT_body_begin:
4359 return "DW_AT_body_begin";
4360 case DW_AT_body_end:
4361 return "DW_AT_body_end";
4362 case DW_AT_GNU_vector:
4363 return "DW_AT_GNU_vector";
4365 case DW_AT_VMS_rtnbeg_pd_address:
4366 return "DW_AT_VMS_rtnbeg_pd_address";
4369 return "DW_AT_<unknown>";
4373 /* Convert a DWARF value form code into its string name. */
4376 dwarf_form_name (unsigned int form)
4381 return "DW_FORM_addr";
4382 case DW_FORM_block2:
4383 return "DW_FORM_block2";
4384 case DW_FORM_block4:
4385 return "DW_FORM_block4";
4387 return "DW_FORM_data2";
4389 return "DW_FORM_data4";
4391 return "DW_FORM_data8";
4392 case DW_FORM_string:
4393 return "DW_FORM_string";
4395 return "DW_FORM_block";
4396 case DW_FORM_block1:
4397 return "DW_FORM_block1";
4399 return "DW_FORM_data1";
4401 return "DW_FORM_flag";
4403 return "DW_FORM_sdata";
4405 return "DW_FORM_strp";
4407 return "DW_FORM_udata";
4408 case DW_FORM_ref_addr:
4409 return "DW_FORM_ref_addr";
4411 return "DW_FORM_ref1";
4413 return "DW_FORM_ref2";
4415 return "DW_FORM_ref4";
4417 return "DW_FORM_ref8";
4418 case DW_FORM_ref_udata:
4419 return "DW_FORM_ref_udata";
4420 case DW_FORM_indirect:
4421 return "DW_FORM_indirect";
4423 return "DW_FORM_<unknown>";
4427 /* Convert a DWARF type code into its string name. */
4431 dwarf_type_encoding_name (unsigned enc)
4435 case DW_ATE_address:
4436 return "DW_ATE_address";
4437 case DW_ATE_boolean:
4438 return "DW_ATE_boolean";
4439 case DW_ATE_complex_float:
4440 return "DW_ATE_complex_float";
4442 return "DW_ATE_float";
4444 return "DW_ATE_signed";
4445 case DW_ATE_signed_char:
4446 return "DW_ATE_signed_char";
4447 case DW_ATE_unsigned:
4448 return "DW_ATE_unsigned";
4449 case DW_ATE_unsigned_char:
4450 return "DW_ATE_unsigned_char";
4452 return "DW_ATE_<unknown>";
4457 /* Determine the "ultimate origin" of a decl. The decl may be an inlined
4458 instance of an inlined instance of a decl which is local to an inline
4459 function, so we have to trace all of the way back through the origin chain
4460 to find out what sort of node actually served as the original seed for the
4464 decl_ultimate_origin (tree decl)
4466 /* output_inline_function sets DECL_ABSTRACT_ORIGIN for all the
4467 nodes in the function to point to themselves; ignore that if
4468 we're trying to output the abstract instance of this function. */
4469 if (DECL_ABSTRACT (decl) && DECL_ABSTRACT_ORIGIN (decl) == decl)
4472 #ifdef ENABLE_CHECKING
4473 if (DECL_FROM_INLINE (DECL_ORIGIN (decl)))
4474 /* Since the DECL_ABSTRACT_ORIGIN for a DECL is supposed to be the
4475 most distant ancestor, this should never happen. */
4479 return DECL_ABSTRACT_ORIGIN (decl);
4482 /* Determine the "ultimate origin" of a block. The block may be an inlined
4483 instance of an inlined instance of a block which is local to an inline
4484 function, so we have to trace all of the way back through the origin chain
4485 to find out what sort of node actually served as the original seed for the
4489 block_ultimate_origin (tree block)
4491 tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
4493 /* output_inline_function sets BLOCK_ABSTRACT_ORIGIN for all the
4494 nodes in the function to point to themselves; ignore that if
4495 we're trying to output the abstract instance of this function. */
4496 if (BLOCK_ABSTRACT (block) && immediate_origin == block)
4499 if (immediate_origin == NULL_TREE)
4504 tree lookahead = immediate_origin;
4508 ret_val = lookahead;
4509 lookahead = (TREE_CODE (ret_val) == BLOCK
4510 ? BLOCK_ABSTRACT_ORIGIN (ret_val) : NULL);
4512 while (lookahead != NULL && lookahead != ret_val);
4518 /* Get the class to which DECL belongs, if any. In g++, the DECL_CONTEXT
4519 of a virtual function may refer to a base class, so we check the 'this'
4523 decl_class_context (tree decl)
4525 tree context = NULL_TREE;
4527 if (TREE_CODE (decl) != FUNCTION_DECL || ! DECL_VINDEX (decl))
4528 context = DECL_CONTEXT (decl);
4530 context = TYPE_MAIN_VARIANT
4531 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
4533 if (context && !TYPE_P (context))
4534 context = NULL_TREE;
4539 /* Add an attribute/value pair to a DIE. We build the lists up in reverse
4540 addition order, and correct that in reverse_all_dies. */
4543 add_dwarf_attr (dw_die_ref die, dw_attr_ref attr)
4545 if (die != NULL && attr != NULL)
4547 attr->dw_attr_next = die->die_attr;
4548 die->die_attr = attr;
4552 static inline enum dw_val_class
4553 AT_class (dw_attr_ref a)
4555 return a->dw_attr_val.val_class;
4558 /* Add a flag value attribute to a DIE. */
4561 add_AT_flag (dw_die_ref die, enum dwarf_attribute attr_kind, unsigned int flag)
4563 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4565 attr->dw_attr_next = NULL;
4566 attr->dw_attr = attr_kind;
4567 attr->dw_attr_val.val_class = dw_val_class_flag;
4568 attr->dw_attr_val.v.val_flag = flag;
4569 add_dwarf_attr (die, attr);
4572 static inline unsigned
4573 AT_flag (dw_attr_ref a)
4575 if (a && AT_class (a) == dw_val_class_flag)
4576 return a->dw_attr_val.v.val_flag;
4581 /* Add a signed integer attribute value to a DIE. */
4584 add_AT_int (dw_die_ref die, enum dwarf_attribute attr_kind, HOST_WIDE_INT int_val)
4586 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4588 attr->dw_attr_next = NULL;
4589 attr->dw_attr = attr_kind;
4590 attr->dw_attr_val.val_class = dw_val_class_const;
4591 attr->dw_attr_val.v.val_int = int_val;
4592 add_dwarf_attr (die, attr);
4595 static inline HOST_WIDE_INT
4596 AT_int (dw_attr_ref a)
4598 if (a && AT_class (a) == dw_val_class_const)
4599 return a->dw_attr_val.v.val_int;
4604 /* Add an unsigned integer attribute value to a DIE. */
4607 add_AT_unsigned (dw_die_ref die, enum dwarf_attribute attr_kind,
4608 unsigned HOST_WIDE_INT unsigned_val)
4610 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4612 attr->dw_attr_next = NULL;
4613 attr->dw_attr = attr_kind;
4614 attr->dw_attr_val.val_class = dw_val_class_unsigned_const;
4615 attr->dw_attr_val.v.val_unsigned = unsigned_val;
4616 add_dwarf_attr (die, attr);
4619 static inline unsigned HOST_WIDE_INT
4620 AT_unsigned (dw_attr_ref a)
4622 if (a && AT_class (a) == dw_val_class_unsigned_const)
4623 return a->dw_attr_val.v.val_unsigned;
4628 /* Add an unsigned double integer attribute value to a DIE. */
4631 add_AT_long_long (dw_die_ref die, enum dwarf_attribute attr_kind,
4632 long unsigned int val_hi, long unsigned int val_low)
4634 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4636 attr->dw_attr_next = NULL;
4637 attr->dw_attr = attr_kind;
4638 attr->dw_attr_val.val_class = dw_val_class_long_long;
4639 attr->dw_attr_val.v.val_long_long.hi = val_hi;
4640 attr->dw_attr_val.v.val_long_long.low = val_low;
4641 add_dwarf_attr (die, attr);
4644 /* Add a floating point attribute value to a DIE and return it. */
4647 add_AT_vec (dw_die_ref die, enum dwarf_attribute attr_kind,
4648 unsigned int length, unsigned int elt_size, unsigned char *array)
4650 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4652 attr->dw_attr_next = NULL;
4653 attr->dw_attr = attr_kind;
4654 attr->dw_attr_val.val_class = dw_val_class_vec;
4655 attr->dw_attr_val.v.val_vec.length = length;
4656 attr->dw_attr_val.v.val_vec.elt_size = elt_size;
4657 attr->dw_attr_val.v.val_vec.array = array;
4658 add_dwarf_attr (die, attr);
4661 /* Hash and equality functions for debug_str_hash. */
4664 debug_str_do_hash (const void *x)
4666 return htab_hash_string (((const struct indirect_string_node *)x)->str);
4670 debug_str_eq (const void *x1, const void *x2)
4672 return strcmp ((((const struct indirect_string_node *)x1)->str),
4673 (const char *)x2) == 0;
4676 /* Add a string attribute value to a DIE. */
4679 add_AT_string (dw_die_ref die, enum dwarf_attribute attr_kind, const char *str)
4681 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4682 struct indirect_string_node *node;
4685 if (! debug_str_hash)
4686 debug_str_hash = htab_create_ggc (10, debug_str_do_hash,
4687 debug_str_eq, NULL);
4689 slot = htab_find_slot_with_hash (debug_str_hash, str,
4690 htab_hash_string (str), INSERT);
4692 *slot = ggc_alloc_cleared (sizeof (struct indirect_string_node));
4693 node = (struct indirect_string_node *) *slot;
4694 node->str = ggc_strdup (str);
4697 attr->dw_attr_next = NULL;
4698 attr->dw_attr = attr_kind;
4699 attr->dw_attr_val.val_class = dw_val_class_str;
4700 attr->dw_attr_val.v.val_str = node;
4701 add_dwarf_attr (die, attr);
4704 static inline const char *
4705 AT_string (dw_attr_ref a)
4707 if (a && AT_class (a) == dw_val_class_str)
4708 return a->dw_attr_val.v.val_str->str;
4713 /* Find out whether a string should be output inline in DIE
4714 or out-of-line in .debug_str section. */
4717 AT_string_form (dw_attr_ref a)
4719 if (a && AT_class (a) == dw_val_class_str)
4721 struct indirect_string_node *node;
4725 node = a->dw_attr_val.v.val_str;
4729 len = strlen (node->str) + 1;
4731 /* If the string is shorter or equal to the size of the reference, it is
4732 always better to put it inline. */
4733 if (len <= DWARF_OFFSET_SIZE || node->refcount == 0)
4734 return node->form = DW_FORM_string;
4736 /* If we cannot expect the linker to merge strings in .debug_str
4737 section, only put it into .debug_str if it is worth even in this
4739 if ((DEBUG_STR_SECTION_FLAGS & SECTION_MERGE) == 0
4740 && (len - DWARF_OFFSET_SIZE) * node->refcount <= len)
4741 return node->form = DW_FORM_string;
4743 ASM_GENERATE_INTERNAL_LABEL (label, "LASF", dw2_string_counter);
4744 ++dw2_string_counter;
4745 node->label = xstrdup (label);
4747 return node->form = DW_FORM_strp;
4753 /* Add a DIE reference attribute value to a DIE. */
4756 add_AT_die_ref (dw_die_ref die, enum dwarf_attribute attr_kind, dw_die_ref targ_die)
4758 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4760 attr->dw_attr_next = NULL;
4761 attr->dw_attr = attr_kind;
4762 attr->dw_attr_val.val_class = dw_val_class_die_ref;
4763 attr->dw_attr_val.v.val_die_ref.die = targ_die;
4764 attr->dw_attr_val.v.val_die_ref.external = 0;
4765 add_dwarf_attr (die, attr);
4768 /* Add an AT_specification attribute to a DIE, and also make the back
4769 pointer from the specification to the definition. */
4772 add_AT_specification (dw_die_ref die, dw_die_ref targ_die)
4774 add_AT_die_ref (die, DW_AT_specification, targ_die);
4775 if (targ_die->die_definition)
4777 targ_die->die_definition = die;
4780 static inline dw_die_ref
4781 AT_ref (dw_attr_ref a)
4783 if (a && AT_class (a) == dw_val_class_die_ref)
4784 return a->dw_attr_val.v.val_die_ref.die;
4790 AT_ref_external (dw_attr_ref a)
4792 if (a && AT_class (a) == dw_val_class_die_ref)
4793 return a->dw_attr_val.v.val_die_ref.external;
4799 set_AT_ref_external (dw_attr_ref a, int i)
4801 if (a && AT_class (a) == dw_val_class_die_ref)
4802 a->dw_attr_val.v.val_die_ref.external = i;
4807 /* Add an FDE reference attribute value to a DIE. */
4810 add_AT_fde_ref (dw_die_ref die, enum dwarf_attribute attr_kind, unsigned int targ_fde)
4812 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4814 attr->dw_attr_next = NULL;
4815 attr->dw_attr = attr_kind;
4816 attr->dw_attr_val.val_class = dw_val_class_fde_ref;
4817 attr->dw_attr_val.v.val_fde_index = targ_fde;
4818 add_dwarf_attr (die, attr);
4821 /* Add a location description attribute value to a DIE. */
4824 add_AT_loc (dw_die_ref die, enum dwarf_attribute attr_kind, dw_loc_descr_ref loc)
4826 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4828 attr->dw_attr_next = NULL;
4829 attr->dw_attr = attr_kind;
4830 attr->dw_attr_val.val_class = dw_val_class_loc;
4831 attr->dw_attr_val.v.val_loc = loc;
4832 add_dwarf_attr (die, attr);
4835 static inline dw_loc_descr_ref
4836 AT_loc (dw_attr_ref a)
4838 if (a && AT_class (a) == dw_val_class_loc)
4839 return a->dw_attr_val.v.val_loc;
4845 add_AT_loc_list (dw_die_ref die, enum dwarf_attribute attr_kind, dw_loc_list_ref loc_list)
4847 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4849 attr->dw_attr_next = NULL;
4850 attr->dw_attr = attr_kind;
4851 attr->dw_attr_val.val_class = dw_val_class_loc_list;
4852 attr->dw_attr_val.v.val_loc_list = loc_list;
4853 add_dwarf_attr (die, attr);
4854 have_location_lists = 1;
4857 static inline dw_loc_list_ref
4858 AT_loc_list (dw_attr_ref a)
4860 if (a && AT_class (a) == dw_val_class_loc_list)
4861 return a->dw_attr_val.v.val_loc_list;
4866 /* Add an address constant attribute value to a DIE. */
4869 add_AT_addr (dw_die_ref die, enum dwarf_attribute attr_kind, rtx addr)
4871 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4873 attr->dw_attr_next = NULL;
4874 attr->dw_attr = attr_kind;
4875 attr->dw_attr_val.val_class = dw_val_class_addr;
4876 attr->dw_attr_val.v.val_addr = addr;
4877 add_dwarf_attr (die, attr);
4881 AT_addr (dw_attr_ref a)
4883 if (a && AT_class (a) == dw_val_class_addr)
4884 return a->dw_attr_val.v.val_addr;
4889 /* Add a label identifier attribute value to a DIE. */
4892 add_AT_lbl_id (dw_die_ref die, enum dwarf_attribute attr_kind, const char *lbl_id)
4894 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4896 attr->dw_attr_next = NULL;
4897 attr->dw_attr = attr_kind;
4898 attr->dw_attr_val.val_class = dw_val_class_lbl_id;
4899 attr->dw_attr_val.v.val_lbl_id = xstrdup (lbl_id);
4900 add_dwarf_attr (die, attr);
4903 /* Add a section offset attribute value to a DIE. */
4906 add_AT_lbl_offset (dw_die_ref die, enum dwarf_attribute attr_kind, const char *label)
4908 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4910 attr->dw_attr_next = NULL;
4911 attr->dw_attr = attr_kind;
4912 attr->dw_attr_val.val_class = dw_val_class_lbl_offset;
4913 attr->dw_attr_val.v.val_lbl_id = xstrdup (label);
4914 add_dwarf_attr (die, attr);
4917 /* Add an offset attribute value to a DIE. */
4920 add_AT_offset (dw_die_ref die, enum dwarf_attribute attr_kind,
4921 unsigned HOST_WIDE_INT offset)
4923 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4925 attr->dw_attr_next = NULL;
4926 attr->dw_attr = attr_kind;
4927 attr->dw_attr_val.val_class = dw_val_class_offset;
4928 attr->dw_attr_val.v.val_offset = offset;
4929 add_dwarf_attr (die, attr);
4932 /* Add an range_list attribute value to a DIE. */
4935 add_AT_range_list (dw_die_ref die, enum dwarf_attribute attr_kind,
4936 long unsigned int offset)
4938 dw_attr_ref attr = ggc_alloc (sizeof (dw_attr_node));
4940 attr->dw_attr_next = NULL;
4941 attr->dw_attr = attr_kind;
4942 attr->dw_attr_val.val_class = dw_val_class_range_list;
4943 attr->dw_attr_val.v.val_offset = offset;
4944 add_dwarf_attr (die, attr);
4947 static inline const char *
4948 AT_lbl (dw_attr_ref a)
4950 if (a && (AT_class (a) == dw_val_class_lbl_id
4951 || AT_class (a) == dw_val_class_lbl_offset))
4952 return a->dw_attr_val.v.val_lbl_id;
4957 /* Get the attribute of type attr_kind. */
4960 get_AT (dw_die_ref die, enum dwarf_attribute attr_kind)
4963 dw_die_ref spec = NULL;
4967 for (a = die->die_attr; a != NULL; a = a->dw_attr_next)
4968 if (a->dw_attr == attr_kind)
4970 else if (a->dw_attr == DW_AT_specification
4971 || a->dw_attr == DW_AT_abstract_origin)
4975 return get_AT (spec, attr_kind);
4981 /* Return the "low pc" attribute value, typically associated with a subprogram
4982 DIE. Return null if the "low pc" attribute is either not present, or if it
4983 cannot be represented as an assembler label identifier. */
4985 static inline const char *
4986 get_AT_low_pc (dw_die_ref die)
4988 dw_attr_ref a = get_AT (die, DW_AT_low_pc);
4990 return a ? AT_lbl (a) : NULL;
4993 /* Return the "high pc" attribute value, typically associated with a subprogram
4994 DIE. Return null if the "high pc" attribute is either not present, or if it
4995 cannot be represented as an assembler label identifier. */
4997 static inline const char *
4998 get_AT_hi_pc (dw_die_ref die)
5000 dw_attr_ref a = get_AT (die, DW_AT_high_pc);
5002 return a ? AT_lbl (a) : NULL;
5005 /* Return the value of the string attribute designated by ATTR_KIND, or
5006 NULL if it is not present. */
5008 static inline const char *
5009 get_AT_string (dw_die_ref die, enum dwarf_attribute attr_kind)
5011 dw_attr_ref a = get_AT (die, attr_kind);
5013 return a ? AT_string (a) : NULL;
5016 /* Return the value of the flag attribute designated by ATTR_KIND, or -1
5017 if it is not present. */
5020 get_AT_flag (dw_die_ref die, enum dwarf_attribute attr_kind)
5022 dw_attr_ref a = get_AT (die, attr_kind);
5024 return a ? AT_flag (a) : 0;
5027 /* Return the value of the unsigned attribute designated by ATTR_KIND, or 0
5028 if it is not present. */
5030 static inline unsigned
5031 get_AT_unsigned (dw_die_ref die, enum dwarf_attribute attr_kind)
5033 dw_attr_ref a = get_AT (die, attr_kind);
5035 return a ? AT_unsigned (a) : 0;
5038 static inline dw_die_ref
5039 get_AT_ref (dw_die_ref die, enum dwarf_attribute attr_kind)
5041 dw_attr_ref a = get_AT (die, attr_kind);
5043 return a ? AT_ref (a) : NULL;
5046 /* Return TRUE if the language is C or C++. */
5051 unsigned int lang = get_AT_unsigned (comp_unit_die, DW_AT_language);
5053 return (lang == DW_LANG_C || lang == DW_LANG_C89
5054 || lang == DW_LANG_C_plus_plus);
5057 /* Return TRUE if the language is C++. */
5062 return (get_AT_unsigned (comp_unit_die, DW_AT_language)
5063 == DW_LANG_C_plus_plus);
5066 /* Return TRUE if the language is Fortran. */
5071 unsigned int lang = get_AT_unsigned (comp_unit_die, DW_AT_language);
5073 return lang == DW_LANG_Fortran77 || lang == DW_LANG_Fortran90;
5076 /* Return TRUE if the language is Java. */
5081 unsigned int lang = get_AT_unsigned (comp_unit_die, DW_AT_language);
5083 return lang == DW_LANG_Java;
5086 /* Return TRUE if the language is Ada. */
5091 unsigned int lang = get_AT_unsigned (comp_unit_die, DW_AT_language);
5093 return lang == DW_LANG_Ada95 || lang == DW_LANG_Ada83;
5096 /* Free up the memory used by A. */
5098 static inline void free_AT (dw_attr_ref);
5100 free_AT (dw_attr_ref a)
5102 if (AT_class (a) == dw_val_class_str)
5103 if (a->dw_attr_val.v.val_str->refcount)
5104 a->dw_attr_val.v.val_str->refcount--;
5107 /* Remove the specified attribute if present. */
5110 remove_AT (dw_die_ref die, enum dwarf_attribute attr_kind)
5113 dw_attr_ref removed = NULL;
5117 for (p = &(die->die_attr); *p; p = &((*p)->dw_attr_next))
5118 if ((*p)->dw_attr == attr_kind)
5121 *p = (*p)->dw_attr_next;
5130 /* Remove child die whose die_tag is specified tag. */
5133 remove_child_TAG (dw_die_ref die, enum dwarf_tag tag)
5135 dw_die_ref current, prev, next;
5136 current = die->die_child;
5138 while (current != NULL)
5140 if (current->die_tag == tag)
5142 next = current->die_sib;
5144 die->die_child = next;
5146 prev->die_sib = next;
5153 current = current->die_sib;
5158 /* Free up the memory used by DIE. */
5161 free_die (dw_die_ref die)
5163 remove_children (die);
5166 /* Discard the children of this DIE. */
5169 remove_children (dw_die_ref die)
5171 dw_die_ref child_die = die->die_child;
5173 die->die_child = NULL;
5175 while (child_die != NULL)
5177 dw_die_ref tmp_die = child_die;
5180 child_die = child_die->die_sib;
5182 for (a = tmp_die->die_attr; a != NULL;)
5184 dw_attr_ref tmp_a = a;
5186 a = a->dw_attr_next;
5194 /* Add a child DIE below its parent. We build the lists up in reverse
5195 addition order, and correct that in reverse_all_dies. */
5198 add_child_die (dw_die_ref die, dw_die_ref child_die)
5200 if (die != NULL && child_die != NULL)
5202 if (die == child_die)
5205 child_die->die_parent = die;
5206 child_die->die_sib = die->die_child;
5207 die->die_child = child_die;
5211 /* Move CHILD, which must be a child of PARENT or the DIE for which PARENT
5212 is the specification, to the front of PARENT's list of children. */
5215 splice_child_die (dw_die_ref parent, dw_die_ref child)
5219 /* We want the declaration DIE from inside the class, not the
5220 specification DIE at toplevel. */
5221 if (child->die_parent != parent)
5223 dw_die_ref tmp = get_AT_ref (child, DW_AT_specification);
5229 if (child->die_parent != parent
5230 && child->die_parent != get_AT_ref (parent, DW_AT_specification))
5233 for (p = &(child->die_parent->die_child); *p; p = &((*p)->die_sib))
5236 *p = child->die_sib;
5240 child->die_parent = parent;
5241 child->die_sib = parent->die_child;
5242 parent->die_child = child;
5245 /* Return a pointer to a newly created DIE node. */
5247 static inline dw_die_ref
5248 new_die (enum dwarf_tag tag_value, dw_die_ref parent_die, tree t)
5250 dw_die_ref die = ggc_alloc_cleared (sizeof (die_node));
5252 die->die_tag = tag_value;
5254 if (parent_die != NULL)
5255 add_child_die (parent_die, die);
5258 limbo_die_node *limbo_node;
5260 limbo_node = ggc_alloc_cleared (sizeof (limbo_die_node));
5261 limbo_node->die = die;
5262 limbo_node->created_for = t;
5263 limbo_node->next = limbo_die_list;
5264 limbo_die_list = limbo_node;
5270 /* Return the DIE associated with the given type specifier. */
5272 static inline dw_die_ref
5273 lookup_type_die (tree type)
5275 return TYPE_SYMTAB_DIE (type);
5278 /* Equate a DIE to a given type specifier. */
5281 equate_type_number_to_die (tree type, dw_die_ref type_die)
5283 TYPE_SYMTAB_DIE (type) = type_die;
5286 /* Returns a hash value for X (which really is a die_struct). */
5289 decl_die_table_hash (const void *x)
5291 return (hashval_t) ((const dw_die_ref) x)->decl_id;
5294 /* Return nonzero if decl_id of die_struct X is the same as UID of decl *Y. */
5297 decl_die_table_eq (const void *x, const void *y)
5299 return (((const dw_die_ref) x)->decl_id == DECL_UID ((const tree) y));
5302 /* Return the DIE associated with a given declaration. */
5304 static inline dw_die_ref
5305 lookup_decl_die (tree decl)
5307 return htab_find_with_hash (decl_die_table, decl, DECL_UID (decl));
5310 /* Returns a hash value for X (which really is a var_loc_list). */
5313 decl_loc_table_hash (const void *x)
5315 return (hashval_t) ((const var_loc_list *) x)->decl_id;
5318 /* Return nonzero if decl_id of var_loc_list X is the same as
5322 decl_loc_table_eq (const void *x, const void *y)
5324 return (((const var_loc_list *) x)->decl_id == DECL_UID ((const tree) y));
5327 /* Return the var_loc list associated with a given declaration. */
5329 static inline var_loc_list *
5330 lookup_decl_loc (tree decl)
5332 return htab_find_with_hash (decl_loc_table, decl, DECL_UID (decl));
5335 /* Equate a DIE to a particular declaration. */
5338 equate_decl_number_to_die (tree decl, dw_die_ref decl_die)
5340 unsigned int decl_id = DECL_UID (decl);
5343 slot = htab_find_slot_with_hash (decl_die_table, decl, decl_id, INSERT);
5345 decl_die->decl_id = decl_id;
5348 /* Add a variable location node to the linked list for DECL. */
5351 add_var_loc_to_decl (tree decl, struct var_loc_node *loc)
5353 unsigned int decl_id = DECL_UID (decl);
5357 slot = htab_find_slot_with_hash (decl_loc_table, decl, decl_id, INSERT);
5360 temp = ggc_alloc_cleared (sizeof (var_loc_list));
5361 temp->decl_id = decl_id;
5369 /* If the current location is the same as the end of the list,
5370 we have nothing to do. */
5371 if (!rtx_equal_p (NOTE_VAR_LOCATION_LOC (temp->last->var_loc_note),
5372 NOTE_VAR_LOCATION_LOC (loc->var_loc_note)))
5374 /* Add LOC to the end of list and update LAST. */
5375 temp->last->next = loc;
5379 /* Do not add empty location to the beginning of the list. */
5380 else if (NOTE_VAR_LOCATION_LOC (loc->var_loc_note) != NULL_RTX)
5387 /* Keep track of the number of spaces used to indent the
5388 output of the debugging routines that print the structure of
5389 the DIE internal representation. */
5390 static int print_indent;
5392 /* Indent the line the number of spaces given by print_indent. */
5395 print_spaces (FILE *outfile)
5397 fprintf (outfile, "%*s", print_indent, "");
5400 /* Print the information associated with a given DIE, and its children.
5401 This routine is a debugging aid only. */
5404 print_die (dw_die_ref die, FILE *outfile)
5409 print_spaces (outfile);
5410 fprintf (outfile, "DIE %4lu: %s\n",
5411 die->die_offset, dwarf_tag_name (die->die_tag));
5412 print_spaces (outfile);
5413 fprintf (outfile, " abbrev id: %lu", die->die_abbrev);
5414 fprintf (outfile, " offset: %lu\n", die->die_offset);
5416 for (a = die->die_attr; a != NULL; a = a->dw_attr_next)
5418 print_spaces (outfile);
5419 fprintf (outfile, " %s: ", dwarf_attr_name (a->dw_attr));
5421 switch (AT_class (a))
5423 case dw_val_class_addr:
5424 fprintf (outfile, "address");
5426 case dw_val_class_offset:
5427 fprintf (outfile, "offset");
5429 case dw_val_class_loc:
5430 fprintf (outfile, "location descriptor");
5432 case dw_val_class_loc_list:
5433 fprintf (outfile, "location list -> label:%s",
5434 AT_loc_list (a)->ll_symbol);
5436 case dw_val_class_range_list:
5437 fprintf (outfile, "range list");
5439 case dw_val_class_const:
5440 fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, AT_int (a));
5442 case dw_val_class_unsigned_const:
5443 fprintf (outfile, HOST_WIDE_INT_PRINT_UNSIGNED, AT_unsigned (a));
5445 case dw_val_class_long_long:
5446 fprintf (outfile, "constant (%lu,%lu)",
5447 a->dw_attr_val.v.val_long_long.hi,
5448 a->dw_attr_val.v.val_long_long.low);
5450 case dw_val_class_vec:
5451 fprintf (outfile, "floating-point or vector constant");
5453 case dw_val_class_flag:
5454 fprintf (outfile, "%u", AT_flag (a));
5456 case dw_val_class_die_ref:
5457 if (AT_ref (a) != NULL)
5459 if (AT_ref (a)->die_symbol)
5460 fprintf (outfile, "die -> label: %s", AT_ref (a)->die_symbol);
5462 fprintf (outfile, "die -> %lu", AT_ref (a)->die_offset);
5465 fprintf (outfile, "die -> <null>");
5467 case dw_val_class_lbl_id:
5468 case dw_val_class_lbl_offset:
5469 fprintf (outfile, "label: %s", AT_lbl (a));
5471 case dw_val_class_str:
5472 if (AT_string (a) != NULL)
5473 fprintf (outfile, "\"%s\"", AT_string (a));
5475 fprintf (outfile, "<null>");
5481 fprintf (outfile, "\n");
5484 if (die->die_child != NULL)
5487 for (c = die->die_child; c != NULL; c = c->die_sib)
5488 print_die (c, outfile);
5492 if (print_indent == 0)
5493 fprintf (outfile, "\n");
5496 /* Print the contents of the source code line number correspondence table.
5497 This routine is a debugging aid only. */
5500 print_dwarf_line_table (FILE *outfile)
5503 dw_line_info_ref line_info;
5505 fprintf (outfile, "\n\nDWARF source line information\n");
5506 for (i = 1; i < line_info_table_in_use; i++)
5508 line_info = &line_info_table[i];
5509 fprintf (outfile, "%5d: ", i);
5510 fprintf (outfile, "%-20s",
5511 VARRAY_CHAR_PTR (file_table, line_info->dw_file_num));
5512 fprintf (outfile, "%6ld", line_info->dw_line_num);
5513 fprintf (outfile, "\n");
5516 fprintf (outfile, "\n\n");
5519 /* Print the information collected for a given DIE. */
5522 debug_dwarf_die (dw_die_ref die)
5524 print_die (die, stderr);
5527 /* Print all DWARF information collected for the compilation unit.
5528 This routine is a debugging aid only. */
5534 print_die (comp_unit_die, stderr);
5535 if (! DWARF2_ASM_LINE_DEBUG_INFO)
5536 print_dwarf_line_table (stderr);
5539 /* We build up the lists of children and attributes by pushing new ones
5540 onto the beginning of the list. Reverse the lists for DIE so that
5541 they are in order of addition. */
5544 reverse_die_lists (dw_die_ref die)
5546 dw_die_ref c, cp, cn;
5547 dw_attr_ref a, ap, an;
5549 for (a = die->die_attr, ap = 0; a; a = an)
5551 an = a->dw_attr_next;
5552 a->dw_attr_next = ap;
5558 for (c = die->die_child, cp = 0; c; c = cn)
5565 die->die_child = cp;
5568 /* reverse_die_lists only reverses the single die you pass it. Since we used to
5569 reverse all dies in add_sibling_attributes, which runs through all the dies,
5570 it would reverse all the dies. Now, however, since we don't call
5571 reverse_die_lists in add_sibling_attributes, we need a routine to
5572 recursively reverse all the dies. This is that routine. */
5575 reverse_all_dies (dw_die_ref die)
5579 reverse_die_lists (die);
5581 for (c = die->die_child; c; c = c->die_sib)
5582 reverse_all_dies (c);
5585 /* Start a new compilation unit DIE for an include file. OLD_UNIT is the CU
5586 for the enclosing include file, if any. BINCL_DIE is the DW_TAG_GNU_BINCL
5587 DIE that marks the start of the DIEs for this include file. */
5590 push_new_compile_unit (dw_die_ref old_unit, dw_die_ref bincl_die)
5592 const char *filename = get_AT_string (bincl_die, DW_AT_name);
5593 dw_die_ref new_unit = gen_compile_unit_die (filename);
5595 new_unit->die_sib = old_unit;
5599 /* Close an include-file CU and reopen the enclosing one. */
5602 pop_compile_unit (dw_die_ref old_unit)
5604 dw_die_ref new_unit = old_unit->die_sib;
5606 old_unit->die_sib = NULL;
5610 #define CHECKSUM(FOO) md5_process_bytes (&(FOO), sizeof (FOO), ctx)
5611 #define CHECKSUM_STRING(FOO) md5_process_bytes ((FOO), strlen (FOO), ctx)
5613 /* Calculate the checksum of a location expression. */
5616 loc_checksum (dw_loc_descr_ref loc, struct md5_ctx *ctx)
5618 CHECKSUM (loc->dw_loc_opc);
5619 CHECKSUM (loc->dw_loc_oprnd1);
5620 CHECKSUM (loc->dw_loc_oprnd2);
5623 /* Calculate the checksum of an attribute. */
5626 attr_checksum (dw_attr_ref at, struct md5_ctx *ctx, int *mark)
5628 dw_loc_descr_ref loc;
5631 CHECKSUM (at->dw_attr);
5633 /* We don't care about differences in file numbering. */
5634 if (at->dw_attr == DW_AT_decl_file
5635 /* Or that this was compiled with a different compiler snapshot; if
5636 the output is the same, that's what matters. */
5637 || at->dw_attr == DW_AT_producer)
5640 switch (AT_class (at))
5642 case dw_val_class_const:
5643 CHECKSUM (at->dw_attr_val.v.val_int);
5645 case dw_val_class_unsigned_const:
5646 CHECKSUM (at->dw_attr_val.v.val_unsigned);
5648 case dw_val_class_long_long:
5649 CHECKSUM (at->dw_attr_val.v.val_long_long);
5651 case dw_val_class_vec:
5652 CHECKSUM (at->dw_attr_val.v.val_vec);
5654 case dw_val_class_flag:
5655 CHECKSUM (at->dw_attr_val.v.val_flag);
5657 case dw_val_class_str:
5658 CHECKSUM_STRING (AT_string (at));
5661 case dw_val_class_addr:
5663 switch (GET_CODE (r))
5666 CHECKSUM_STRING (XSTR (r, 0));
5674 case dw_val_class_offset:
5675 CHECKSUM (at->dw_attr_val.v.val_offset);
5678 case dw_val_class_loc:
5679 for (loc = AT_loc (at); loc; loc = loc->dw_loc_next)
5680 loc_checksum (loc, ctx);
5683 case dw_val_class_die_ref:
5684 die_checksum (AT_ref (at), ctx, mark);
5687 case dw_val_class_fde_ref:
5688 case dw_val_class_lbl_id:
5689 case dw_val_class_lbl_offset:
5697 /* Calculate the checksum of a DIE. */
5700 die_checksum (dw_die_ref die, struct md5_ctx *ctx, int *mark)
5705 /* To avoid infinite recursion. */
5708 CHECKSUM (die->die_mark);
5711 die->die_mark = ++(*mark);
5713 CHECKSUM (die->die_tag);
5715 for (a = die->die_attr; a; a = a->dw_attr_next)
5716 attr_checksum (a, ctx, mark);
5718 for (c = die->die_child; c; c = c->die_sib)
5719 die_checksum (c, ctx, mark);
5723 #undef CHECKSUM_STRING
5725 /* Do the location expressions look same? */
5727 same_loc_p (dw_loc_descr_ref loc1, dw_loc_descr_ref loc2, int *mark)
5729 return loc1->dw_loc_opc == loc2->dw_loc_opc
5730 && same_dw_val_p (&loc1->dw_loc_oprnd1, &loc2->dw_loc_oprnd1, mark)
5731 && same_dw_val_p (&loc1->dw_loc_oprnd2, &loc2->dw_loc_oprnd2, mark);
5734 /* Do the values look the same? */
5736 same_dw_val_p (dw_val_node *v1, dw_val_node *v2, int *mark)
5738 dw_loc_descr_ref loc1, loc2;
5741 if (v1->val_class != v2->val_class)
5744 switch (v1->val_class)
5746 case dw_val_class_const:
5747 return v1->v.val_int == v2->v.val_int;
5748 case dw_val_class_unsigned_const:
5749 return v1->v.val_unsigned == v2->v.val_unsigned;
5750 case dw_val_class_long_long:
5751 return v1->v.val_long_long.hi == v2->v.val_long_long.hi
5752 && v1->v.val_long_long.low == v2->v.val_long_long.low;
5753 case dw_val_class_vec:
5754 if (v1->v.val_vec.length != v2->v.val_vec.length
5755 || v1->v.val_vec.elt_size != v2->v.val_vec.elt_size)
5757 if (memcmp (v1->v.val_vec.array, v2->v.val_vec.array,
5758 v1->v.val_vec.length * v1->v.val_vec.elt_size))
5761 case dw_val_class_flag:
5762 return v1->v.val_flag == v2->v.val_flag;
5763 case dw_val_class_str:
5764 return !strcmp(v1->v.val_str->str, v2->v.val_str->str);
5766 case dw_val_class_addr:
5767 r1 = v1->v.val_addr;
5768 r2 = v2->v.val_addr;
5769 if (GET_CODE (r1) != GET_CODE (r2))
5771 switch (GET_CODE (r1))
5774 return !strcmp (XSTR (r1, 0), XSTR (r2, 0));
5780 case dw_val_class_offset:
5781 return v1->v.val_offset == v2->v.val_offset;
5783 case dw_val_class_loc:
5784 for (loc1 = v1->v.val_loc, loc2 = v2->v.val_loc;
5786 loc1 = loc1->dw_loc_next, loc2 = loc2->dw_loc_next)
5787 if (!same_loc_p (loc1, loc2, mark))
5789 return !loc1 && !loc2;
5791 case dw_val_class_die_ref:
5792 return same_die_p (v1->v.val_die_ref.die, v2->v.val_die_ref.die, mark);
5794 case dw_val_class_fde_ref:
5795 case dw_val_class_lbl_id:
5796 case dw_val_class_lbl_offset:
5804 /* Do the attributes look the same? */
5807 same_attr_p (dw_attr_ref at1, dw_attr_ref at2, int *mark)
5809 if (at1->dw_attr != at2->dw_attr)
5812 /* We don't care about differences in file numbering. */
5813 if (at1->dw_attr == DW_AT_decl_file
5814 /* Or that this was compiled with a different compiler snapshot; if
5815 the output is the same, that's what matters. */
5816 || at1->dw_attr == DW_AT_producer)
5819 return same_dw_val_p (&at1->dw_attr_val, &at2->dw_attr_val, mark);
5822 /* Do the dies look the same? */
5825 same_die_p (dw_die_ref die1, dw_die_ref die2, int *mark)
5830 /* To avoid infinite recursion. */
5832 return die1->die_mark == die2->die_mark;
5833 die1->die_mark = die2->die_mark = ++(*mark);
5835 if (die1->die_tag != die2->die_tag)
5838 for (a1 = die1->die_attr, a2 = die2->die_attr;
5840 a1 = a1->dw_attr_next, a2 = a2->dw_attr_next)
5841 if (!same_attr_p (a1, a2, mark))
5846 for (c1 = die1->die_child, c2 = die2->die_child;
5848 c1 = c1->die_sib, c2 = c2->die_sib)
5849 if (!same_die_p (c1, c2, mark))
5857 /* Do the dies look the same? Wrapper around same_die_p. */
5860 same_die_p_wrap (dw_die_ref die1, dw_die_ref die2)
5863 int ret = same_die_p (die1, die2, &mark);
5865 unmark_all_dies (die1);
5866 unmark_all_dies (die2);
5871 /* The prefix to attach to symbols on DIEs in the current comdat debug
5873 static char *comdat_symbol_id;
5875 /* The index of the current symbol within the current comdat CU. */
5876 static unsigned int comdat_symbol_number;
5878 /* Calculate the MD5 checksum of the compilation unit DIE UNIT_DIE and its
5879 children, and set comdat_symbol_id accordingly. */
5882 compute_section_prefix (dw_die_ref unit_die)
5884 const char *die_name = get_AT_string (unit_die, DW_AT_name);
5885 const char *base = die_name ? lbasename (die_name) : "anonymous";
5886 char *name = alloca (strlen (base) + 64);
5889 unsigned char checksum[16];
5892 /* Compute the checksum of the DIE, then append part of it as hex digits to
5893 the name filename of the unit. */
5895 md5_init_ctx (&ctx);
5897 die_checksum (unit_die, &ctx, &mark);
5898 unmark_all_dies (unit_die);
5899 md5_finish_ctx (&ctx, checksum);
5901 sprintf (name, "%s.", base);
5902 clean_symbol_name (name);
5904 p = name + strlen (name);
5905 for (i = 0; i < 4; i++)
5907 sprintf (p, "%.2x", checksum[i]);
5911 comdat_symbol_id = unit_die->die_symbol = xstrdup (name);
5912 comdat_symbol_number = 0;
5915 /* Returns nonzero if DIE represents a type, in the sense of TYPE_P. */
5918 is_type_die (dw_die_ref die)
5920 switch (die->die_tag)
5922 case DW_TAG_array_type:
5923 case DW_TAG_class_type:
5924 case DW_TAG_enumeration_type:
5925 case DW_TAG_pointer_type:
5926 case DW_TAG_reference_type:
5927 case DW_TAG_string_type:
5928 case DW_TAG_structure_type:
5929 case DW_TAG_subroutine_type:
5930 case DW_TAG_union_type:
5931 case DW_TAG_ptr_to_member_type:
5932 case DW_TAG_set_type:
5933 case DW_TAG_subrange_type:
5934 case DW_TAG_base_type:
5935 case DW_TAG_const_type:
5936 case DW_TAG_file_type:
5937 case DW_TAG_packed_type:
5938 case DW_TAG_volatile_type:
5939 case DW_TAG_typedef:
5946 /* Returns 1 iff C is the sort of DIE that should go into a COMDAT CU.
5947 Basically, we want to choose the bits that are likely to be shared between
5948 compilations (types) and leave out the bits that are specific to individual
5949 compilations (functions). */
5952 is_comdat_die (dw_die_ref c)
5954 /* I think we want to leave base types and __vtbl_ptr_type in the main CU, as
5955 we do for stabs. The advantage is a greater likelihood of sharing between
5956 objects that don't include headers in the same order (and therefore would
5957 put the base types in a different comdat). jason 8/28/00 */
5959 if (c->die_tag == DW_TAG_base_type)
5962 if (c->die_tag == DW_TAG_pointer_type
5963 || c->die_tag == DW_TAG_reference_type
5964 || c->die_tag == DW_TAG_const_type
5965 || c->die_tag == DW_TAG_volatile_type)
5967 dw_die_ref t = get_AT_ref (c, DW_AT_type);
5969 return t ? is_comdat_die (t) : 0;
5972 return is_type_die (c);
5975 /* Returns 1 iff C is the sort of DIE that might be referred to from another
5976 compilation unit. */
5979 is_symbol_die (dw_die_ref c)
5981 return (is_type_die (c)
5982 || (get_AT (c, DW_AT_declaration)
5983 && !get_AT (c, DW_AT_specification)));
5987 gen_internal_sym (const char *prefix)
5991 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, label_num++);
5992 return xstrdup (buf);
5995 /* Assign symbols to all worthy DIEs under DIE. */
5998 assign_symbol_names (dw_die_ref die)
6002 if (is_symbol_die (die))
6004 if (comdat_symbol_id)
6006 char *p = alloca (strlen (comdat_symbol_id) + 64);
6008 sprintf (p, "%s.%s.%x", DIE_LABEL_PREFIX,
6009 comdat_symbol_id, comdat_symbol_number++);
6010 die->die_symbol = xstrdup (p);
6013 die->die_symbol = gen_internal_sym ("LDIE");
6016 for (c = die->die_child; c != NULL; c = c->die_sib)
6017 assign_symbol_names (c);
6020 struct cu_hash_table_entry
6023 unsigned min_comdat_num, max_comdat_num;
6024 struct cu_hash_table_entry *next;
6027 /* Routines to manipulate hash table of CUs. */
6029 htab_cu_hash (const void *of)
6031 const struct cu_hash_table_entry *entry = of;
6033 return htab_hash_string (entry->cu->die_symbol);
6037 htab_cu_eq (const void *of1, const void *of2)
6039 const struct cu_hash_table_entry *entry1 = of1;
6040 const struct die_struct *entry2 = of2;
6042 return !strcmp (entry1->cu->die_symbol, entry2->die_symbol);
6046 htab_cu_del (void *what)
6048 struct cu_hash_table_entry *next, *entry = what;
6058 /* Check whether we have already seen this CU and set up SYM_NUM
6061 check_duplicate_cu (dw_die_ref cu, htab_t htable, unsigned int *sym_num)
6063 struct cu_hash_table_entry dummy;
6064 struct cu_hash_table_entry **slot, *entry, *last = &dummy;
6066 dummy.max_comdat_num = 0;
6068 slot = (struct cu_hash_table_entry **)
6069 htab_find_slot_with_hash (htable, cu, htab_hash_string (cu->die_symbol),
6073 for (; entry; last = entry, entry = entry->next)
6075 if (same_die_p_wrap (cu, entry->cu))
6081 *sym_num = entry->min_comdat_num;
6085 entry = xcalloc (1, sizeof (struct cu_hash_table_entry));
6087 entry->min_comdat_num = *sym_num = last->max_comdat_num;
6088 entry->next = *slot;
6094 /* Record SYM_NUM to record of CU in HTABLE. */
6096 record_comdat_symbol_number (dw_die_ref cu, htab_t htable, unsigned int sym_num)
6098 struct cu_hash_table_entry **slot, *entry;
6100 slot = (struct cu_hash_table_entry **)
6101 htab_find_slot_with_hash (htable, cu, htab_hash_string (cu->die_symbol),
6105 entry->max_comdat_num = sym_num;
6108 /* Traverse the DIE (which is always comp_unit_die), and set up
6109 additional compilation units for each of the include files we see
6110 bracketed by BINCL/EINCL. */
6113 break_out_includes (dw_die_ref die)
6116 dw_die_ref unit = NULL;
6117 limbo_die_node *node, **pnode;
6118 htab_t cu_hash_table;
6120 for (ptr = &(die->die_child); *ptr;)
6122 dw_die_ref c = *ptr;
6124 if (c->die_tag == DW_TAG_GNU_BINCL || c->die_tag == DW_TAG_GNU_EINCL
6125 || (unit && is_comdat_die (c)))
6127 /* This DIE is for a secondary CU; remove it from the main one. */
6130 if (c->die_tag == DW_TAG_GNU_BINCL)
6132 unit = push_new_compile_unit (unit, c);
6135 else if (c->die_tag == DW_TAG_GNU_EINCL)
6137 unit = pop_compile_unit (unit);
6141 add_child_die (unit, c);
6145 /* Leave this DIE in the main CU. */
6146 ptr = &(c->die_sib);
6152 /* We can only use this in debugging, since the frontend doesn't check
6153 to make sure that we leave every include file we enter. */
6158 assign_symbol_names (die);
6159 cu_hash_table = htab_create (10, htab_cu_hash, htab_cu_eq, htab_cu_del);
6160 for (node = limbo_die_list, pnode = &limbo_die_list;
6166 compute_section_prefix (node->die);
6167 is_dupl = check_duplicate_cu (node->die, cu_hash_table,
6168 &comdat_symbol_number);
6169 assign_symbol_names (node->die);
6171 *pnode = node->next;
6174 pnode = &node->next;
6175 record_comdat_symbol_number (node->die, cu_hash_table,
6176 comdat_symbol_number);
6179 htab_delete (cu_hash_table);
6182 /* Traverse the DIE and add a sibling attribute if it may have the
6183 effect of speeding up access to siblings. To save some space,
6184 avoid generating sibling attributes for DIE's without children. */
6187 add_sibling_attributes (dw_die_ref die)
6191 if (die->die_tag != DW_TAG_compile_unit
6192 && die->die_sib && die->die_child != NULL)
6193 /* Add the sibling link to the front of the attribute list. */
6194 add_AT_die_ref (die, DW_AT_sibling, die->die_sib);
6196 for (c = die->die_child; c != NULL; c = c->die_sib)
6197 add_sibling_attributes (c);
6200 /* Output all location lists for the DIE and its children. */
6203 output_location_lists (dw_die_ref die)
6208 for (d_attr = die->die_attr; d_attr; d_attr = d_attr->dw_attr_next)
6209 if (AT_class (d_attr) == dw_val_class_loc_list)
6210 output_loc_list (AT_loc_list (d_attr));
6212 for (c = die->die_child; c != NULL; c = c->die_sib)
6213 output_location_lists (c);
6217 /* The format of each DIE (and its attribute value pairs) is encoded in an
6218 abbreviation table. This routine builds the abbreviation table and assigns
6219 a unique abbreviation id for each abbreviation entry. The children of each
6220 die are visited recursively. */
6223 build_abbrev_table (dw_die_ref die)
6225 unsigned long abbrev_id;
6226 unsigned int n_alloc;
6228 dw_attr_ref d_attr, a_attr;
6230 /* Scan the DIE references, and mark as external any that refer to
6231 DIEs from other CUs (i.e. those which are not marked). */
6232 for (d_attr = die->die_attr; d_attr; d_attr = d_attr->dw_attr_next)
6233 if (AT_class (d_attr) == dw_val_class_die_ref
6234 && AT_ref (d_attr)->die_mark == 0)
6236 if (AT_ref (d_attr)->die_symbol == 0)
6239 set_AT_ref_external (d_attr, 1);
6242 for (abbrev_id = 1; abbrev_id < abbrev_die_table_in_use; ++abbrev_id)
6244 dw_die_ref abbrev = abbrev_die_table[abbrev_id];
6246 if (abbrev->die_tag == die->die_tag)
6248 if ((abbrev->die_child != NULL) == (die->die_child != NULL))
6250 a_attr = abbrev->die_attr;
6251 d_attr = die->die_attr;
6253 while (a_attr != NULL && d_attr != NULL)
6255 if ((a_attr->dw_attr != d_attr->dw_attr)
6256 || (value_format (a_attr) != value_format (d_attr)))
6259 a_attr = a_attr->dw_attr_next;
6260 d_attr = d_attr->dw_attr_next;
6263 if (a_attr == NULL && d_attr == NULL)
6269 if (abbrev_id >= abbrev_die_table_in_use)
6271 if (abbrev_die_table_in_use >= abbrev_die_table_allocated)
6273 n_alloc = abbrev_die_table_allocated + ABBREV_DIE_TABLE_INCREMENT;
6274 abbrev_die_table = ggc_realloc (abbrev_die_table,
6275 sizeof (dw_die_ref) * n_alloc);
6277 memset (&abbrev_die_table[abbrev_die_table_allocated], 0,
6278 (n_alloc - abbrev_die_table_allocated) * sizeof (dw_die_ref));
6279 abbrev_die_table_allocated = n_alloc;
6282 ++abbrev_die_table_in_use;
6283 abbrev_die_table[abbrev_id] = die;
6286 die->die_abbrev = abbrev_id;
6287 for (c = die->die_child; c != NULL; c = c->die_sib)
6288 build_abbrev_table (c);
6291 /* Return the power-of-two number of bytes necessary to represent VALUE. */
6294 constant_size (long unsigned int value)
6301 log = floor_log2 (value);
6304 log = 1 << (floor_log2 (log) + 1);
6309 /* Return the size of a DIE as it is represented in the
6310 .debug_info section. */
6312 static unsigned long
6313 size_of_die (dw_die_ref die)
6315 unsigned long size = 0;
6318 size += size_of_uleb128 (die->die_abbrev);
6319 for (a = die->die_attr; a != NULL; a = a->dw_attr_next)
6321 switch (AT_class (a))
6323 case dw_val_class_addr:
6324 size += DWARF2_ADDR_SIZE;
6326 case dw_val_class_offset:
6327 size += DWARF_OFFSET_SIZE;
6329 case dw_val_class_loc:
6331 unsigned long lsize = size_of_locs (AT_loc (a));
6334 size += constant_size (lsize);
6338 case dw_val_class_loc_list:
6339 size += DWARF_OFFSET_SIZE;
6341 case dw_val_class_range_list:
6342 size += DWARF_OFFSET_SIZE;
6344 case dw_val_class_const:
6345 size += size_of_sleb128 (AT_int (a));
6347 case dw_val_class_unsigned_const:
6348 size += constant_size (AT_unsigned (a));
6350 case dw_val_class_long_long:
6351 size += 1 + 2*HOST_BITS_PER_LONG/HOST_BITS_PER_CHAR; /* block */
6353 case dw_val_class_vec:
6354 size += 1 + (a->dw_attr_val.v.val_vec.length
6355 * a->dw_attr_val.v.val_vec.elt_size); /* block */
6357 case dw_val_class_flag:
6360 case dw_val_class_die_ref:
6361 if (AT_ref_external (a))
6362 size += DWARF2_ADDR_SIZE;
6364 size += DWARF_OFFSET_SIZE;
6366 case dw_val_class_fde_ref:
6367 size += DWARF_OFFSET_SIZE;
6369 case dw_val_class_lbl_id:
6370 size += DWARF2_ADDR_SIZE;
6372 case dw_val_class_lbl_offset:
6373 size += DWARF_OFFSET_SIZE;
6375 case dw_val_class_str:
6376 if (AT_string_form (a) == DW_FORM_strp)
6377 size += DWARF_OFFSET_SIZE;
6379 size += strlen (a->dw_attr_val.v.val_str->str) + 1;
6389 /* Size the debugging information associated with a given DIE. Visits the
6390 DIE's children recursively. Updates the global variable next_die_offset, on
6391 each time through. Uses the current value of next_die_offset to update the
6392 die_offset field in each DIE. */
6395 calc_die_sizes (dw_die_ref die)
6399 die->die_offset = next_die_offset;
6400 next_die_offset += size_of_die (die);
6402 for (c = die->die_child; c != NULL; c = c->die_sib)
6405 if (die->die_child != NULL)
6406 /* Count the null byte used to terminate sibling lists. */
6407 next_die_offset += 1;
6410 /* Set the marks for a die and its children. We do this so
6411 that we know whether or not a reference needs to use FORM_ref_addr; only
6412 DIEs in the same CU will be marked. We used to clear out the offset
6413 and use that as the flag, but ran into ordering problems. */
6416 mark_dies (dw_die_ref die)
6424 for (c = die->die_child; c; c = c->die_sib)
6428 /* Clear the marks for a die and its children. */
6431 unmark_dies (dw_die_ref die)
6439 for (c = die->die_child; c; c = c->die_sib)
6443 /* Clear the marks for a die, its children and referred dies. */
6446 unmark_all_dies (dw_die_ref die)
6455 for (c = die->die_child; c; c = c->die_sib)
6456 unmark_all_dies (c);
6458 for (a = die->die_attr; a; a = a->dw_attr_next)
6459 if (AT_class (a) == dw_val_class_die_ref)
6460 unmark_all_dies (AT_ref (a));
6463 /* Return the size of the .debug_pubnames table generated for the
6464 compilation unit. */
6466 static unsigned long
6467 size_of_pubnames (void)
6472 size = DWARF_PUBNAMES_HEADER_SIZE;
6473 for (i = 0; i < pubname_table_in_use; i++)
6475 pubname_ref p = &pubname_table[i];
6476 size += DWARF_OFFSET_SIZE + strlen (p->name) + 1;
6479 size += DWARF_OFFSET_SIZE;
6483 /* Return the size of the information in the .debug_aranges section. */
6485 static unsigned long
6486 size_of_aranges (void)
6490 size = DWARF_ARANGES_HEADER_SIZE;
6492 /* Count the address/length pair for this compilation unit. */
6493 size += 2 * DWARF2_ADDR_SIZE;
6494 size += 2 * DWARF2_ADDR_SIZE * arange_table_in_use;
6496 /* Count the two zero words used to terminated the address range table. */
6497 size += 2 * DWARF2_ADDR_SIZE;
6501 /* Select the encoding of an attribute value. */
6503 static enum dwarf_form
6504 value_format (dw_attr_ref a)
6506 switch (a->dw_attr_val.val_class)
6508 case dw_val_class_addr:
6509 return DW_FORM_addr;
6510 case dw_val_class_range_list:
6511 case dw_val_class_offset:
6512 if (DWARF_OFFSET_SIZE == 4)
6513 return DW_FORM_data4;
6514 if (DWARF_OFFSET_SIZE == 8)
6515 return DW_FORM_data8;
6517 case dw_val_class_loc_list:
6518 /* FIXME: Could be DW_FORM_data8, with a > 32 bit size
6519 .debug_loc section */
6520 return DW_FORM_data4;
6521 case dw_val_class_loc:
6522 switch (constant_size (size_of_locs (AT_loc (a))))
6525 return DW_FORM_block1;
6527 return DW_FORM_block2;
6531 case dw_val_class_const:
6532 return DW_FORM_sdata;
6533 case dw_val_class_unsigned_const:
6534 switch (constant_size (AT_unsigned (a)))
6537 return DW_FORM_data1;
6539 return DW_FORM_data2;
6541 return DW_FORM_data4;
6543 return DW_FORM_data8;
6547 case dw_val_class_long_long:
6548 return DW_FORM_block1;
6549 case dw_val_class_vec:
6550 return DW_FORM_block1;
6551 case dw_val_class_flag:
6552 return DW_FORM_flag;
6553 case dw_val_class_die_ref:
6554 if (AT_ref_external (a))
6555 return DW_FORM_ref_addr;
6558 case dw_val_class_fde_ref:
6559 return DW_FORM_data;
6560 case dw_val_class_lbl_id:
6561 return DW_FORM_addr;
6562 case dw_val_class_lbl_offset:
6563 return DW_FORM_data;
6564 case dw_val_class_str:
6565 return AT_string_form (a);
6572 /* Output the encoding of an attribute value. */
6575 output_value_format (dw_attr_ref a)
6577 enum dwarf_form form = value_format (a);
6579 dw2_asm_output_data_uleb128 (form, "(%s)", dwarf_form_name (form));
6582 /* Output the .debug_abbrev section which defines the DIE abbreviation
6586 output_abbrev_section (void)
6588 unsigned long abbrev_id;
6592 for (abbrev_id = 1; abbrev_id < abbrev_die_table_in_use; ++abbrev_id)
6594 dw_die_ref abbrev = abbrev_die_table[abbrev_id];
6596 dw2_asm_output_data_uleb128 (abbrev_id, "(abbrev code)");
6597 dw2_asm_output_data_uleb128 (abbrev->die_tag, "(TAG: %s)",
6598 dwarf_tag_name (abbrev->die_tag));
6600 if (abbrev->die_child != NULL)
6601 dw2_asm_output_data (1, DW_children_yes, "DW_children_yes");
6603 dw2_asm_output_data (1, DW_children_no, "DW_children_no");
6605 for (a_attr = abbrev->die_attr; a_attr != NULL;
6606 a_attr = a_attr->dw_attr_next)
6608 dw2_asm_output_data_uleb128 (a_attr->dw_attr, "(%s)",
6609 dwarf_attr_name (a_attr->dw_attr));
6610 output_value_format (a_attr);
6613 dw2_asm_output_data (1, 0, NULL);
6614 dw2_asm_output_data (1, 0, NULL);
6617 /* Terminate the table. */
6618 dw2_asm_output_data (1, 0, NULL);
6621 /* Output a symbol we can use to refer to this DIE from another CU. */
6624 output_die_symbol (dw_die_ref die)
6626 char *sym = die->die_symbol;
6631 if (strncmp (sym, DIE_LABEL_PREFIX, sizeof (DIE_LABEL_PREFIX) - 1) == 0)
6632 /* We make these global, not weak; if the target doesn't support
6633 .linkonce, it doesn't support combining the sections, so debugging
6635 (*targetm.asm_out.globalize_label) (asm_out_file, sym);
6637 ASM_OUTPUT_LABEL (asm_out_file, sym);
6640 /* Return a new location list, given the begin and end range, and the
6641 expression. gensym tells us whether to generate a new internal symbol for
6642 this location list node, which is done for the head of the list only. */
6644 static inline dw_loc_list_ref
6645 new_loc_list (dw_loc_descr_ref expr, const char *begin, const char *end,
6646 const char *section, unsigned int gensym)
6648 dw_loc_list_ref retlist = ggc_alloc_cleared (sizeof (dw_loc_list_node));
6650 retlist->begin = begin;
6652 retlist->expr = expr;
6653 retlist->section = section;
6655 retlist->ll_symbol = gen_internal_sym ("LLST");
6660 /* Add a location description expression to a location list. */
6663 add_loc_descr_to_loc_list (dw_loc_list_ref *list_head, dw_loc_descr_ref descr,
6664 const char *begin, const char *end,
6665 const char *section)
6669 /* Find the end of the chain. */
6670 for (d = list_head; (*d) != NULL; d = &(*d)->dw_loc_next)
6673 /* Add a new location list node to the list. */
6674 *d = new_loc_list (descr, begin, end, section, 0);
6677 /* Output the location list given to us. */
6680 output_loc_list (dw_loc_list_ref list_head)
6682 dw_loc_list_ref curr = list_head;
6684 ASM_OUTPUT_LABEL (asm_out_file, list_head->ll_symbol);
6686 /* Walk the location list, and output each range + expression. */
6687 for (curr = list_head; curr != NULL; curr = curr->dw_loc_next)
6690 if (separate_line_info_table_in_use == 0)
6692 dw2_asm_output_delta (DWARF2_ADDR_SIZE, curr->begin, curr->section,
6693 "Location list begin address (%s)",
6694 list_head->ll_symbol);
6695 dw2_asm_output_delta (DWARF2_ADDR_SIZE, curr->end, curr->section,
6696 "Location list end address (%s)",
6697 list_head->ll_symbol);
6701 dw2_asm_output_addr (DWARF2_ADDR_SIZE, curr->begin,
6702 "Location list begin address (%s)",
6703 list_head->ll_symbol);
6704 dw2_asm_output_addr (DWARF2_ADDR_SIZE, curr->end,
6705 "Location list end address (%s)",
6706 list_head->ll_symbol);
6708 size = size_of_locs (curr->expr);
6710 /* Output the block length for this list of location operations. */
6713 dw2_asm_output_data (2, size, "%s", "Location expression size");
6715 output_loc_sequence (curr->expr);
6718 dw2_asm_output_data (DWARF2_ADDR_SIZE, 0,
6719 "Location list terminator begin (%s)",
6720 list_head->ll_symbol);
6721 dw2_asm_output_data (DWARF2_ADDR_SIZE, 0,
6722 "Location list terminator end (%s)",
6723 list_head->ll_symbol);
6726 /* Output the DIE and its attributes. Called recursively to generate
6727 the definitions of each child DIE. */
6730 output_die (dw_die_ref die)
6736 /* If someone in another CU might refer to us, set up a symbol for
6737 them to point to. */
6738 if (die->die_symbol)
6739 output_die_symbol (die);
6741 dw2_asm_output_data_uleb128 (die->die_abbrev, "(DIE (0x%lx) %s)",
6742 die->die_offset, dwarf_tag_name (die->die_tag));
6744 for (a = die->die_attr; a != NULL; a = a->dw_attr_next)
6746 const char *name = dwarf_attr_name (a->dw_attr);
6748 switch (AT_class (a))
6750 case dw_val_class_addr:
6751 dw2_asm_output_addr_rtx (DWARF2_ADDR_SIZE, AT_addr (a), "%s", name);
6754 case dw_val_class_offset:
6755 dw2_asm_output_data (DWARF_OFFSET_SIZE, a->dw_attr_val.v.val_offset,
6759 case dw_val_class_range_list:
6761 char *p = strchr (ranges_section_label, '\0');
6763 sprintf (p, "+" HOST_WIDE_INT_PRINT_HEX,
6764 a->dw_attr_val.v.val_offset);
6765 dw2_asm_output_offset (DWARF_OFFSET_SIZE, ranges_section_label,
6771 case dw_val_class_loc:
6772 size = size_of_locs (AT_loc (a));
6774 /* Output the block length for this list of location operations. */
6775 dw2_asm_output_data (constant_size (size), size, "%s", name);
6777 output_loc_sequence (AT_loc (a));
6780 case dw_val_class_const:
6781 /* ??? It would be slightly more efficient to use a scheme like is
6782 used for unsigned constants below, but gdb 4.x does not sign
6783 extend. Gdb 5.x does sign extend. */
6784 dw2_asm_output_data_sleb128 (AT_int (a), "%s", name);
6787 case dw_val_class_unsigned_const:
6788 dw2_asm_output_data (constant_size (AT_unsigned (a)),
6789 AT_unsigned (a), "%s", name);
6792 case dw_val_class_long_long:
6794 unsigned HOST_WIDE_INT first, second;
6796 dw2_asm_output_data (1,
6797 2 * HOST_BITS_PER_LONG / HOST_BITS_PER_CHAR,
6800 if (WORDS_BIG_ENDIAN)
6802 first = a->dw_attr_val.v.val_long_long.hi;
6803 second = a->dw_attr_val.v.val_long_long.low;
6807 first = a->dw_attr_val.v.val_long_long.low;
6808 second = a->dw_attr_val.v.val_long_long.hi;
6811 dw2_asm_output_data (HOST_BITS_PER_LONG / HOST_BITS_PER_CHAR,
6812 first, "long long constant");
6813 dw2_asm_output_data (HOST_BITS_PER_LONG / HOST_BITS_PER_CHAR,
6818 case dw_val_class_vec:
6820 unsigned int elt_size = a->dw_attr_val.v.val_vec.elt_size;
6821 unsigned int len = a->dw_attr_val.v.val_vec.length;
6825 dw2_asm_output_data (1, len * elt_size, "%s", name);
6826 if (elt_size > sizeof (HOST_WIDE_INT))
6831 for (i = 0, p = a->dw_attr_val.v.val_vec.array;
6834 dw2_asm_output_data (elt_size, extract_int (p, elt_size),
6835 "fp or vector constant word %u", i);
6839 case dw_val_class_flag:
6840 dw2_asm_output_data (1, AT_flag (a), "%s", name);
6843 case dw_val_class_loc_list:
6845 char *sym = AT_loc_list (a)->ll_symbol;
6849 dw2_asm_output_offset (DWARF_OFFSET_SIZE, sym, "%s", name);
6853 case dw_val_class_die_ref:
6854 if (AT_ref_external (a))
6856 char *sym = AT_ref (a)->die_symbol;
6860 dw2_asm_output_offset (DWARF2_ADDR_SIZE, sym, "%s", name);
6862 else if (AT_ref (a)->die_offset == 0)
6865 dw2_asm_output_data (DWARF_OFFSET_SIZE, AT_ref (a)->die_offset,
6869 case dw_val_class_fde_ref:
6873 ASM_GENERATE_INTERNAL_LABEL (l1, FDE_LABEL,
6874 a->dw_attr_val.v.val_fde_index * 2);
6875 dw2_asm_output_offset (DWARF_OFFSET_SIZE, l1, "%s", name);
6879 case dw_val_class_lbl_id:
6880 dw2_asm_output_addr (DWARF2_ADDR_SIZE, AT_lbl (a), "%s", name);
6883 case dw_val_class_lbl_offset:
6884 dw2_asm_output_offset (DWARF_OFFSET_SIZE, AT_lbl (a), "%s", name);
6887 case dw_val_class_str:
6888 if (AT_string_form (a) == DW_FORM_strp)
6889 dw2_asm_output_offset (DWARF_OFFSET_SIZE,
6890 a->dw_attr_val.v.val_str->label,
6891 "%s: \"%s\"", name, AT_string (a));
6893 dw2_asm_output_nstring (AT_string (a), -1, "%s", name);
6901 for (c = die->die_child; c != NULL; c = c->die_sib)
6904 /* Add null byte to terminate sibling list. */
6905 if (die->die_child != NULL)
6906 dw2_asm_output_data (1, 0, "end of children of DIE 0x%lx",
6910 /* Output the compilation unit that appears at the beginning of the
6911 .debug_info section, and precedes the DIE descriptions. */
6914 output_compilation_unit_header (void)
6916 if (DWARF_INITIAL_LENGTH_SIZE - DWARF_OFFSET_SIZE == 4)
6917 dw2_asm_output_data (4, 0xffffffff,
6918 "Initial length escape value indicating 64-bit DWARF extension");
6919 dw2_asm_output_data (DWARF_OFFSET_SIZE,
6920 next_die_offset - DWARF_INITIAL_LENGTH_SIZE,
6921 "Length of Compilation Unit Info");
6922 dw2_asm_output_data (2, DWARF_VERSION, "DWARF version number");
6923 dw2_asm_output_offset (DWARF_OFFSET_SIZE, abbrev_section_label,
6924 "Offset Into Abbrev. Section");
6925 dw2_asm_output_data (1, DWARF2_ADDR_SIZE, "Pointer Size (in bytes)");
6928 /* Output the compilation unit DIE and its children. */
6931 output_comp_unit (dw_die_ref die, int output_if_empty)
6933 const char *secname;
6936 /* Unless we are outputting main CU, we may throw away empty ones. */
6937 if (!output_if_empty && die->die_child == NULL)
6940 /* Even if there are no children of this DIE, we must output the information
6941 about the compilation unit. Otherwise, on an empty translation unit, we
6942 will generate a present, but empty, .debug_info section. IRIX 6.5 `nm'
6943 will then complain when examining the file. First mark all the DIEs in
6944 this CU so we know which get local refs. */
6947 build_abbrev_table (die);
6949 /* Initialize the beginning DIE offset - and calculate sizes/offsets. */
6950 next_die_offset = DWARF_COMPILE_UNIT_HEADER_SIZE;
6951 calc_die_sizes (die);
6953 oldsym = die->die_symbol;
6956 tmp = alloca (strlen (oldsym) + 24);
6958 sprintf (tmp, ".gnu.linkonce.wi.%s", oldsym);
6960 die->die_symbol = NULL;
6963 secname = (const char *) DEBUG_INFO_SECTION;
6965 /* Output debugging information. */
6966 named_section_flags (secname, SECTION_DEBUG);
6967 output_compilation_unit_header ();
6970 /* Leave the marks on the main CU, so we can check them in
6975 die->die_symbol = oldsym;
6979 /* The DWARF2 pubname for a nested thingy looks like "A::f". The
6980 output of lang_hooks.decl_printable_name for C++ looks like
6981 "A::f(int)". Let's drop the argument list, and maybe the scope. */
6984 dwarf2_name (tree decl, int scope)
6986 return lang_hooks.decl_printable_name (decl, scope ? 1 : 0);
6989 /* Add a new entry to .debug_pubnames if appropriate. */
6992 add_pubname (tree decl, dw_die_ref die)
6996 if (! TREE_PUBLIC (decl))
6999 if (pubname_table_in_use == pubname_table_allocated)
7001 pubname_table_allocated += PUBNAME_TABLE_INCREMENT;
7003 = ggc_realloc (pubname_table,
7004 (pubname_table_allocated * sizeof (pubname_entry)));
7005 memset (pubname_table + pubname_table_in_use, 0,
7006 PUBNAME_TABLE_INCREMENT * sizeof (pubname_entry));
7009 p = &pubname_table[pubname_table_in_use++];
7011 p->name = xstrdup (dwarf2_name (decl, 1));
7014 /* Output the public names table used to speed up access to externally
7015 visible names. For now, only generate entries for externally
7016 visible procedures. */
7019 output_pubnames (void)
7022 unsigned long pubnames_length = size_of_pubnames ();
7024 if (DWARF_INITIAL_LENGTH_SIZE - DWARF_OFFSET_SIZE == 4)
7025 dw2_asm_output_data (4, 0xffffffff,
7026 "Initial length escape value indicating 64-bit DWARF extension");
7027 dw2_asm_output_data (DWARF_OFFSET_SIZE, pubnames_length,
7028 "Length of Public Names Info");
7029 dw2_asm_output_data (2, DWARF_VERSION, "DWARF Version");
7030 dw2_asm_output_offset (DWARF_OFFSET_SIZE, debug_info_section_label,
7031 "Offset of Compilation Unit Info");
7032 dw2_asm_output_data (DWARF_OFFSET_SIZE, next_die_offset,
7033 "Compilation Unit Length");
7035 for (i = 0; i < pubname_table_in_use; i++)
7037 pubname_ref pub = &pubname_table[i];
7039 /* We shouldn't see pubnames for DIEs outside of the main CU. */
7040 if (pub->die->die_mark == 0)
7043 dw2_asm_output_data (DWARF_OFFSET_SIZE, pub->die->die_offset,
7046 dw2_asm_output_nstring (pub->name, -1, "external name");
7049 dw2_asm_output_data (DWARF_OFFSET_SIZE, 0, NULL);
7052 /* Add a new entry to .debug_aranges if appropriate. */
7055 add_arange (tree decl, dw_die_ref die)
7057 if (! DECL_SECTION_NAME (decl))
7060 if (arange_table_in_use == arange_table_allocated)
7062 arange_table_allocated += ARANGE_TABLE_INCREMENT;
7063 arange_table = ggc_realloc (arange_table,
7064 (arange_table_allocated
7065 * sizeof (dw_die_ref)));
7066 memset (arange_table + arange_table_in_use, 0,
7067 ARANGE_TABLE_INCREMENT * sizeof (dw_die_ref));
7070 arange_table[arange_table_in_use++] = die;
7073 /* Output the information that goes into the .debug_aranges table.
7074 Namely, define the beginning and ending address range of the
7075 text section generated for this compilation unit. */
7078 output_aranges (void)
7081 unsigned long aranges_length = size_of_aranges ();
7083 if (DWARF_INITIAL_LENGTH_SIZE - DWARF_OFFSET_SIZE == 4)
7084 dw2_asm_output_data (4, 0xffffffff,
7085 "Initial length escape value indicating 64-bit DWARF extension");
7086 dw2_asm_output_data (DWARF_OFFSET_SIZE, aranges_length,
7087 "Length of Address Ranges Info");
7088 dw2_asm_output_data (2, DWARF_VERSION, "DWARF Version");
7089 dw2_asm_output_offset (DWARF_OFFSET_SIZE, debug_info_section_label,
7090 "Offset of Compilation Unit Info");
7091 dw2_asm_output_data (1, DWARF2_ADDR_SIZE, "Size of Address");
7092 dw2_asm_output_data (1, 0, "Size of Segment Descriptor");
7094 /* We need to align to twice the pointer size here. */
7095 if (DWARF_ARANGES_PAD_SIZE)
7097 /* Pad using a 2 byte words so that padding is correct for any
7099 dw2_asm_output_data (2, 0, "Pad to %d byte boundary",
7100 2 * DWARF2_ADDR_SIZE);
7101 for (i = 2; i < (unsigned) DWARF_ARANGES_PAD_SIZE; i += 2)
7102 dw2_asm_output_data (2, 0, NULL);
7105 dw2_asm_output_addr (DWARF2_ADDR_SIZE, text_section_label, "Address");
7106 dw2_asm_output_delta (DWARF2_ADDR_SIZE, text_end_label,
7107 text_section_label, "Length");
7109 for (i = 0; i < arange_table_in_use; i++)
7111 dw_die_ref die = arange_table[i];
7113 /* We shouldn't see aranges for DIEs outside of the main CU. */
7114 if (die->die_mark == 0)
7117 if (die->die_tag == DW_TAG_subprogram)
7119 dw2_asm_output_addr (DWARF2_ADDR_SIZE, get_AT_low_pc (die),
7121 dw2_asm_output_delta (DWARF2_ADDR_SIZE, get_AT_hi_pc (die),
7122 get_AT_low_pc (die), "Length");
7126 /* A static variable; extract the symbol from DW_AT_location.
7127 Note that this code isn't currently hit, as we only emit
7128 aranges for functions (jason 9/23/99). */
7129 dw_attr_ref a = get_AT (die, DW_AT_location);
7130 dw_loc_descr_ref loc;
7132 if (! a || AT_class (a) != dw_val_class_loc)
7136 if (loc->dw_loc_opc != DW_OP_addr)
7139 dw2_asm_output_addr_rtx (DWARF2_ADDR_SIZE,
7140 loc->dw_loc_oprnd1.v.val_addr, "Address");
7141 dw2_asm_output_data (DWARF2_ADDR_SIZE,
7142 get_AT_unsigned (die, DW_AT_byte_size),
7147 /* Output the terminator words. */
7148 dw2_asm_output_data (DWARF2_ADDR_SIZE, 0, NULL);
7149 dw2_asm_output_data (DWARF2_ADDR_SIZE, 0, NULL);
7152 /* Add a new entry to .debug_ranges. Return the offset at which it
7156 add_ranges (tree block)
7158 unsigned int in_use = ranges_table_in_use;
7160 if (in_use == ranges_table_allocated)
7162 ranges_table_allocated += RANGES_TABLE_INCREMENT;
7164 = ggc_realloc (ranges_table, (ranges_table_allocated
7165 * sizeof (struct dw_ranges_struct)));
7166 memset (ranges_table + ranges_table_in_use, 0,
7167 RANGES_TABLE_INCREMENT * sizeof (struct dw_ranges_struct));
7170 ranges_table[in_use].block_num = (block ? BLOCK_NUMBER (block) : 0);
7171 ranges_table_in_use = in_use + 1;
7173 return in_use * 2 * DWARF2_ADDR_SIZE;
7177 output_ranges (void)
7180 static const char *const start_fmt = "Offset 0x%x";
7181 const char *fmt = start_fmt;
7183 for (i = 0; i < ranges_table_in_use; i++)
7185 int block_num = ranges_table[i].block_num;
7189 char blabel[MAX_ARTIFICIAL_LABEL_BYTES];
7190 char elabel[MAX_ARTIFICIAL_LABEL_BYTES];
7192 ASM_GENERATE_INTERNAL_LABEL (blabel, BLOCK_BEGIN_LABEL, block_num);
7193 ASM_GENERATE_INTERNAL_LABEL (elabel, BLOCK_END_LABEL, block_num);
7195 /* If all code is in the text section, then the compilation
7196 unit base address defaults to DW_AT_low_pc, which is the
7197 base of the text section. */
7198 if (separate_line_info_table_in_use == 0)
7200 dw2_asm_output_delta (DWARF2_ADDR_SIZE, blabel,
7202 fmt, i * 2 * DWARF2_ADDR_SIZE);
7203 dw2_asm_output_delta (DWARF2_ADDR_SIZE, elabel,
7204 text_section_label, NULL);
7207 /* Otherwise, we add a DW_AT_entry_pc attribute to force the
7208 compilation unit base address to zero, which allows us to
7209 use absolute addresses, and not worry about whether the
7210 target supports cross-section arithmetic. */
7213 dw2_asm_output_addr (DWARF2_ADDR_SIZE, blabel,
7214 fmt, i * 2 * DWARF2_ADDR_SIZE);
7215 dw2_asm_output_addr (DWARF2_ADDR_SIZE, elabel, NULL);
7222 dw2_asm_output_data (DWARF2_ADDR_SIZE, 0, NULL);
7223 dw2_asm_output_data (DWARF2_ADDR_SIZE, 0, NULL);
7229 /* Data structure containing information about input files. */
7232 char *path; /* Complete file name. */
7233 char *fname; /* File name part. */
7234 int length; /* Length of entire string. */
7235 int file_idx; /* Index in input file table. */
7236 int dir_idx; /* Index in directory table. */
7239 /* Data structure containing information about directories with source
7243 char *path; /* Path including directory name. */
7244 int length; /* Path length. */
7245 int prefix; /* Index of directory entry which is a prefix. */
7246 int count; /* Number of files in this directory. */
7247 int dir_idx; /* Index of directory used as base. */
7248 int used; /* Used in the end? */
7251 /* Callback function for file_info comparison. We sort by looking at
7252 the directories in the path. */
7255 file_info_cmp (const void *p1, const void *p2)
7257 const struct file_info *s1 = p1;
7258 const struct file_info *s2 = p2;
7262 /* Take care of file names without directories. We need to make sure that
7263 we return consistent values to qsort since some will get confused if
7264 we return the same value when identical operands are passed in opposite
7265 orders. So if neither has a directory, return 0 and otherwise return
7266 1 or -1 depending on which one has the directory. */
7267 if ((s1->path == s1->fname || s2->path == s2->fname))
7268 return (s2->path == s2->fname) - (s1->path == s1->fname);
7270 cp1 = (unsigned char *) s1->path;
7271 cp2 = (unsigned char *) s2->path;
7277 /* Reached the end of the first path? If so, handle like above. */
7278 if ((cp1 == (unsigned char *) s1->fname)
7279 || (cp2 == (unsigned char *) s2->fname))
7280 return ((cp2 == (unsigned char *) s2->fname)
7281 - (cp1 == (unsigned char *) s1->fname));
7283 /* Character of current path component the same? */
7284 else if (*cp1 != *cp2)
7289 /* Output the directory table and the file name table. We try to minimize
7290 the total amount of memory needed. A heuristic is used to avoid large
7291 slowdowns with many input files. */
7294 output_file_names (void)
7296 struct file_info *files;
7297 struct dir_info *dirs;
7306 /* Handle the case where file_table is empty. */
7307 if (VARRAY_ACTIVE_SIZE (file_table) <= 1)
7309 dw2_asm_output_data (1, 0, "End directory table");
7310 dw2_asm_output_data (1, 0, "End file name table");
7314 /* Allocate the various arrays we need. */
7315 files = alloca (VARRAY_ACTIVE_SIZE (file_table) * sizeof (struct file_info));
7316 dirs = alloca (VARRAY_ACTIVE_SIZE (file_table) * sizeof (struct dir_info));
7318 /* Sort the file names. */
7319 for (i = 1; i < VARRAY_ACTIVE_SIZE (file_table); i++)
7323 /* Skip all leading "./". */
7324 f = VARRAY_CHAR_PTR (file_table, i);
7325 while (f[0] == '.' && f[1] == '/')
7328 /* Create a new array entry. */
7330 files[i].length = strlen (f);
7331 files[i].file_idx = i;
7333 /* Search for the file name part. */
7334 f = strrchr (f, '/');
7335 files[i].fname = f == NULL ? files[i].path : f + 1;
7338 qsort (files + 1, VARRAY_ACTIVE_SIZE (file_table) - 1,
7339 sizeof (files[0]), file_info_cmp);
7341 /* Find all the different directories used. */
7342 dirs[0].path = files[1].path;
7343 dirs[0].length = files[1].fname - files[1].path;
7344 dirs[0].prefix = -1;
7346 dirs[0].dir_idx = 0;
7348 files[1].dir_idx = 0;
7351 for (i = 2; i < VARRAY_ACTIVE_SIZE (file_table); i++)
7352 if (files[i].fname - files[i].path == dirs[ndirs - 1].length
7353 && memcmp (dirs[ndirs - 1].path, files[i].path,
7354 dirs[ndirs - 1].length) == 0)
7356 /* Same directory as last entry. */
7357 files[i].dir_idx = ndirs - 1;
7358 ++dirs[ndirs - 1].count;
7364 /* This is a new directory. */
7365 dirs[ndirs].path = files[i].path;
7366 dirs[ndirs].length = files[i].fname - files[i].path;
7367 dirs[ndirs].count = 1;
7368 dirs[ndirs].dir_idx = ndirs;
7369 dirs[ndirs].used = 0;
7370 files[i].dir_idx = ndirs;
7372 /* Search for a prefix. */
7373 dirs[ndirs].prefix = -1;
7374 for (j = 0; j < ndirs; j++)
7375 if (dirs[j].length < dirs[ndirs].length
7376 && dirs[j].length > 1
7377 && (dirs[ndirs].prefix == -1
7378 || dirs[j].length > dirs[dirs[ndirs].prefix].length)
7379 && memcmp (dirs[j].path, dirs[ndirs].path, dirs[j].length) == 0)
7380 dirs[ndirs].prefix = j;
7385 /* Now to the actual work. We have to find a subset of the directories which
7386 allow expressing the file name using references to the directory table
7387 with the least amount of characters. We do not do an exhaustive search
7388 where we would have to check out every combination of every single
7389 possible prefix. Instead we use a heuristic which provides nearly optimal
7390 results in most cases and never is much off. */
7391 saved = alloca (ndirs * sizeof (int));
7392 savehere = alloca (ndirs * sizeof (int));
7394 memset (saved, '\0', ndirs * sizeof (saved[0]));
7395 for (i = 0; i < ndirs; i++)
7400 /* We can always save some space for the current directory. But this
7401 does not mean it will be enough to justify adding the directory. */
7402 savehere[i] = dirs[i].length;
7403 total = (savehere[i] - saved[i]) * dirs[i].count;
7405 for (j = i + 1; j < ndirs; j++)
7408 if (saved[j] < dirs[i].length)
7410 /* Determine whether the dirs[i] path is a prefix of the
7415 while (k != -1 && k != (int) i)
7420 /* Yes it is. We can possibly safe some memory but
7421 writing the filenames in dirs[j] relative to
7423 savehere[j] = dirs[i].length;
7424 total += (savehere[j] - saved[j]) * dirs[j].count;
7429 /* Check whether we can safe enough to justify adding the dirs[i]
7431 if (total > dirs[i].length + 1)
7433 /* It's worthwhile adding. */
7434 for (j = i; j < ndirs; j++)
7435 if (savehere[j] > 0)
7437 /* Remember how much we saved for this directory so far. */
7438 saved[j] = savehere[j];
7440 /* Remember the prefix directory. */
7441 dirs[j].dir_idx = i;
7446 /* We have to emit them in the order they appear in the file_table array
7447 since the index is used in the debug info generation. To do this
7448 efficiently we generate a back-mapping of the indices first. */
7449 backmap = alloca (VARRAY_ACTIVE_SIZE (file_table) * sizeof (int));
7450 for (i = 1; i < VARRAY_ACTIVE_SIZE (file_table); i++)
7452 backmap[files[i].file_idx] = i;
7454 /* Mark this directory as used. */
7455 dirs[dirs[files[i].dir_idx].dir_idx].used = 1;
7458 /* That was it. We are ready to emit the information. First emit the
7459 directory name table. We have to make sure the first actually emitted
7460 directory name has index one; zero is reserved for the current working
7461 directory. Make sure we do not confuse these indices with the one for the
7462 constructed table (even though most of the time they are identical). */
7464 idx_offset = dirs[0].length > 0 ? 1 : 0;
7465 for (i = 1 - idx_offset; i < ndirs; i++)
7466 if (dirs[i].used != 0)
7468 dirs[i].used = idx++;
7469 dw2_asm_output_nstring (dirs[i].path, dirs[i].length - 1,
7470 "Directory Entry: 0x%x", dirs[i].used);
7473 dw2_asm_output_data (1, 0, "End directory table");
7475 /* Correct the index for the current working directory entry if it
7477 if (idx_offset == 0)
7480 /* Now write all the file names. */
7481 for (i = 1; i < VARRAY_ACTIVE_SIZE (file_table); i++)
7483 int file_idx = backmap[i];
7484 int dir_idx = dirs[files[file_idx].dir_idx].dir_idx;
7486 dw2_asm_output_nstring (files[file_idx].path + dirs[dir_idx].length, -1,
7487 "File Entry: 0x%lx", (unsigned long) i);
7489 /* Include directory index. */
7490 dw2_asm_output_data_uleb128 (dirs[dir_idx].used, NULL);
7492 /* Modification time. */
7493 dw2_asm_output_data_uleb128 (0, NULL);
7495 /* File length in bytes. */
7496 dw2_asm_output_data_uleb128 (0, NULL);
7499 dw2_asm_output_data (1, 0, "End file name table");
7503 /* Output the source line number correspondence information. This
7504 information goes into the .debug_line section. */
7507 output_line_info (void)
7509 char l1[20], l2[20], p1[20], p2[20];
7510 char line_label[MAX_ARTIFICIAL_LABEL_BYTES];
7511 char prev_line_label[MAX_ARTIFICIAL_LABEL_BYTES];
7514 unsigned long lt_index;
7515 unsigned long current_line;
7518 unsigned long current_file;
7519 unsigned long function;
7521 ASM_GENERATE_INTERNAL_LABEL (l1, LINE_NUMBER_BEGIN_LABEL, 0);
7522 ASM_GENERATE_INTERNAL_LABEL (l2, LINE_NUMBER_END_LABEL, 0);
7523 ASM_GENERATE_INTERNAL_LABEL (p1, LN_PROLOG_AS_LABEL, 0);
7524 ASM_GENERATE_INTERNAL_LABEL (p2, LN_PROLOG_END_LABEL, 0);
7526 if (DWARF_INITIAL_LENGTH_SIZE - DWARF_OFFSET_SIZE == 4)
7527 dw2_asm_output_data (4, 0xffffffff,
7528 "Initial length escape value indicating 64-bit DWARF extension");
7529 dw2_asm_output_delta (DWARF_OFFSET_SIZE, l2, l1,
7530 "Length of Source Line Info");
7531 ASM_OUTPUT_LABEL (asm_out_file, l1);
7533 dw2_asm_output_data (2, DWARF_VERSION, "DWARF Version");
7534 dw2_asm_output_delta (DWARF_OFFSET_SIZE, p2, p1, "Prolog Length");
7535 ASM_OUTPUT_LABEL (asm_out_file, p1);
7537 /* Define the architecture-dependent minimum instruction length (in
7538 bytes). In this implementation of DWARF, this field is used for
7539 information purposes only. Since GCC generates assembly language,
7540 we have no a priori knowledge of how many instruction bytes are
7541 generated for each source line, and therefore can use only the
7542 DW_LNE_set_address and DW_LNS_fixed_advance_pc line information
7543 commands. Accordingly, we fix this as `1', which is "correct
7544 enough" for all architectures, and don't let the target override. */
7545 dw2_asm_output_data (1, 1,
7546 "Minimum Instruction Length");
7548 dw2_asm_output_data (1, DWARF_LINE_DEFAULT_IS_STMT_START,
7549 "Default is_stmt_start flag");
7550 dw2_asm_output_data (1, DWARF_LINE_BASE,
7551 "Line Base Value (Special Opcodes)");
7552 dw2_asm_output_data (1, DWARF_LINE_RANGE,
7553 "Line Range Value (Special Opcodes)");
7554 dw2_asm_output_data (1, DWARF_LINE_OPCODE_BASE,
7555 "Special Opcode Base");
7557 for (opc = 1; opc < DWARF_LINE_OPCODE_BASE; opc++)
7561 case DW_LNS_advance_pc:
7562 case DW_LNS_advance_line:
7563 case DW_LNS_set_file:
7564 case DW_LNS_set_column:
7565 case DW_LNS_fixed_advance_pc:
7573 dw2_asm_output_data (1, n_op_args, "opcode: 0x%x has %d args",
7577 /* Write out the information about the files we use. */
7578 output_file_names ();
7579 ASM_OUTPUT_LABEL (asm_out_file, p2);
7581 /* We used to set the address register to the first location in the text
7582 section here, but that didn't accomplish anything since we already
7583 have a line note for the opening brace of the first function. */
7585 /* Generate the line number to PC correspondence table, encoded as
7586 a series of state machine operations. */
7589 strcpy (prev_line_label, text_section_label);
7590 for (lt_index = 1; lt_index < line_info_table_in_use; ++lt_index)
7592 dw_line_info_ref line_info = &line_info_table[lt_index];
7595 /* Disable this optimization for now; GDB wants to see two line notes
7596 at the beginning of a function so it can find the end of the
7599 /* Don't emit anything for redundant notes. Just updating the
7600 address doesn't accomplish anything, because we already assume
7601 that anything after the last address is this line. */
7602 if (line_info->dw_line_num == current_line
7603 && line_info->dw_file_num == current_file)
7607 /* Emit debug info for the address of the current line.
7609 Unfortunately, we have little choice here currently, and must always
7610 use the most general form. GCC does not know the address delta
7611 itself, so we can't use DW_LNS_advance_pc. Many ports do have length
7612 attributes which will give an upper bound on the address range. We
7613 could perhaps use length attributes to determine when it is safe to
7614 use DW_LNS_fixed_advance_pc. */
7616 ASM_GENERATE_INTERNAL_LABEL (line_label, LINE_CODE_LABEL, lt_index);
7619 /* This can handle deltas up to 0xffff. This takes 3 bytes. */
7620 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc,
7621 "DW_LNS_fixed_advance_pc");
7622 dw2_asm_output_delta (2, line_label, prev_line_label, NULL);
7626 /* This can handle any delta. This takes
7627 4+DWARF2_ADDR_SIZE bytes. */
7628 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
7629 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE, NULL);
7630 dw2_asm_output_data (1, DW_LNE_set_address, NULL);
7631 dw2_asm_output_addr (DWARF2_ADDR_SIZE, line_label, NULL);
7634 strcpy (prev_line_label, line_label);
7636 /* Emit debug info for the source file of the current line, if
7637 different from the previous line. */
7638 if (line_info->dw_file_num != current_file)
7640 current_file = line_info->dw_file_num;
7641 dw2_asm_output_data (1, DW_LNS_set_file, "DW_LNS_set_file");
7642 dw2_asm_output_data_uleb128 (current_file, "(\"%s\")",
7643 VARRAY_CHAR_PTR (file_table,
7647 /* Emit debug info for the current line number, choosing the encoding
7648 that uses the least amount of space. */
7649 if (line_info->dw_line_num != current_line)
7651 line_offset = line_info->dw_line_num - current_line;
7652 line_delta = line_offset - DWARF_LINE_BASE;
7653 current_line = line_info->dw_line_num;
7654 if (line_delta >= 0 && line_delta < (DWARF_LINE_RANGE - 1))
7655 /* This can handle deltas from -10 to 234, using the current
7656 definitions of DWARF_LINE_BASE and DWARF_LINE_RANGE. This
7658 dw2_asm_output_data (1, DWARF_LINE_OPCODE_BASE + line_delta,
7659 "line %lu", current_line);
7662 /* This can handle any delta. This takes at least 4 bytes,
7663 depending on the value being encoded. */
7664 dw2_asm_output_data (1, DW_LNS_advance_line,
7665 "advance to line %lu", current_line);
7666 dw2_asm_output_data_sleb128 (line_offset, NULL);
7667 dw2_asm_output_data (1, DW_LNS_copy, "DW_LNS_copy");
7671 /* We still need to start a new row, so output a copy insn. */
7672 dw2_asm_output_data (1, DW_LNS_copy, "DW_LNS_copy");
7675 /* Emit debug info for the address of the end of the function. */
7678 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc,
7679 "DW_LNS_fixed_advance_pc");
7680 dw2_asm_output_delta (2, text_end_label, prev_line_label, NULL);
7684 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
7685 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE, NULL);
7686 dw2_asm_output_data (1, DW_LNE_set_address, NULL);
7687 dw2_asm_output_addr (DWARF2_ADDR_SIZE, text_end_label, NULL);
7690 dw2_asm_output_data (1, 0, "DW_LNE_end_sequence");
7691 dw2_asm_output_data_uleb128 (1, NULL);
7692 dw2_asm_output_data (1, DW_LNE_end_sequence, NULL);
7697 for (lt_index = 0; lt_index < separate_line_info_table_in_use;)
7699 dw_separate_line_info_ref line_info
7700 = &separate_line_info_table[lt_index];
7703 /* Don't emit anything for redundant notes. */
7704 if (line_info->dw_line_num == current_line
7705 && line_info->dw_file_num == current_file
7706 && line_info->function == function)
7710 /* Emit debug info for the address of the current line. If this is
7711 a new function, or the first line of a function, then we need
7712 to handle it differently. */
7713 ASM_GENERATE_INTERNAL_LABEL (line_label, SEPARATE_LINE_CODE_LABEL,
7715 if (function != line_info->function)
7717 function = line_info->function;
7719 /* Set the address register to the first line in the function. */
7720 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
7721 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE, NULL);
7722 dw2_asm_output_data (1, DW_LNE_set_address, NULL);
7723 dw2_asm_output_addr (DWARF2_ADDR_SIZE, line_label, NULL);
7727 /* ??? See the DW_LNS_advance_pc comment above. */
7730 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc,
7731 "DW_LNS_fixed_advance_pc");
7732 dw2_asm_output_delta (2, line_label, prev_line_label, NULL);
7736 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
7737 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE, NULL);
7738 dw2_asm_output_data (1, DW_LNE_set_address, NULL);
7739 dw2_asm_output_addr (DWARF2_ADDR_SIZE, line_label, NULL);
7743 strcpy (prev_line_label, line_label);
7745 /* Emit debug info for the source file of the current line, if
7746 different from the previous line. */
7747 if (line_info->dw_file_num != current_file)
7749 current_file = line_info->dw_file_num;
7750 dw2_asm_output_data (1, DW_LNS_set_file, "DW_LNS_set_file");
7751 dw2_asm_output_data_uleb128 (current_file, "(\"%s\")",
7752 VARRAY_CHAR_PTR (file_table,
7756 /* Emit debug info for the current line number, choosing the encoding
7757 that uses the least amount of space. */
7758 if (line_info->dw_line_num != current_line)
7760 line_offset = line_info->dw_line_num - current_line;
7761 line_delta = line_offset - DWARF_LINE_BASE;
7762 current_line = line_info->dw_line_num;
7763 if (line_delta >= 0 && line_delta < (DWARF_LINE_RANGE - 1))
7764 dw2_asm_output_data (1, DWARF_LINE_OPCODE_BASE + line_delta,
7765 "line %lu", current_line);
7768 dw2_asm_output_data (1, DW_LNS_advance_line,
7769 "advance to line %lu", current_line);
7770 dw2_asm_output_data_sleb128 (line_offset, NULL);
7771 dw2_asm_output_data (1, DW_LNS_copy, "DW_LNS_copy");
7775 dw2_asm_output_data (1, DW_LNS_copy, "DW_LNS_copy");
7783 /* If we're done with a function, end its sequence. */
7784 if (lt_index == separate_line_info_table_in_use
7785 || separate_line_info_table[lt_index].function != function)
7790 /* Emit debug info for the address of the end of the function. */
7791 ASM_GENERATE_INTERNAL_LABEL (line_label, FUNC_END_LABEL, function);
7794 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc,
7795 "DW_LNS_fixed_advance_pc");
7796 dw2_asm_output_delta (2, line_label, prev_line_label, NULL);
7800 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
7801 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE, NULL);
7802 dw2_asm_output_data (1, DW_LNE_set_address, NULL);
7803 dw2_asm_output_addr (DWARF2_ADDR_SIZE, line_label, NULL);
7806 /* Output the marker for the end of this sequence. */
7807 dw2_asm_output_data (1, 0, "DW_LNE_end_sequence");
7808 dw2_asm_output_data_uleb128 (1, NULL);
7809 dw2_asm_output_data (1, DW_LNE_end_sequence, NULL);
7813 /* Output the marker for the end of the line number info. */
7814 ASM_OUTPUT_LABEL (asm_out_file, l2);
7817 /* Given a pointer to a tree node for some base type, return a pointer to
7818 a DIE that describes the given type.
7820 This routine must only be called for GCC type nodes that correspond to
7821 Dwarf base (fundamental) types. */
7824 base_type_die (tree type)
7826 dw_die_ref base_type_result;
7827 const char *type_name;
7828 enum dwarf_type encoding;
7829 tree name = TYPE_NAME (type);
7831 if (TREE_CODE (type) == ERROR_MARK || TREE_CODE (type) == VOID_TYPE)
7836 if (TREE_CODE (name) == TYPE_DECL)
7837 name = DECL_NAME (name);
7839 type_name = IDENTIFIER_POINTER (name);
7842 type_name = "__unknown__";
7844 switch (TREE_CODE (type))
7847 /* Carefully distinguish the C character types, without messing
7848 up if the language is not C. Note that we check only for the names
7849 that contain spaces; other names might occur by coincidence in other
7851 if (! (TYPE_PRECISION (type) == CHAR_TYPE_SIZE
7852 && (type == char_type_node
7853 || ! strcmp (type_name, "signed char")
7854 || ! strcmp (type_name, "unsigned char"))))
7856 if (TREE_UNSIGNED (type))
7857 encoding = DW_ATE_unsigned;
7859 encoding = DW_ATE_signed;
7862 /* else fall through. */
7865 /* GNU Pascal/Ada CHAR type. Not used in C. */
7866 if (TREE_UNSIGNED (type))
7867 encoding = DW_ATE_unsigned_char;
7869 encoding = DW_ATE_signed_char;
7873 encoding = DW_ATE_float;
7876 /* Dwarf2 doesn't know anything about complex ints, so use
7877 a user defined type for it. */
7879 if (TREE_CODE (TREE_TYPE (type)) == REAL_TYPE)
7880 encoding = DW_ATE_complex_float;
7882 encoding = DW_ATE_lo_user;
7886 /* GNU FORTRAN/Ada/C++ BOOLEAN type. */
7887 encoding = DW_ATE_boolean;
7891 /* No other TREE_CODEs are Dwarf fundamental types. */
7895 base_type_result = new_die (DW_TAG_base_type, comp_unit_die, type);
7896 if (demangle_name_func)
7897 type_name = (*demangle_name_func) (type_name);
7899 add_AT_string (base_type_result, DW_AT_name, type_name);
7900 add_AT_unsigned (base_type_result, DW_AT_byte_size,
7901 int_size_in_bytes (type));
7902 add_AT_unsigned (base_type_result, DW_AT_encoding, encoding);
7904 return base_type_result;
7907 /* Given a pointer to an arbitrary ..._TYPE tree node, return a pointer to
7908 the Dwarf "root" type for the given input type. The Dwarf "root" type of
7909 a given type is generally the same as the given type, except that if the
7910 given type is a pointer or reference type, then the root type of the given
7911 type is the root type of the "basis" type for the pointer or reference
7912 type. (This definition of the "root" type is recursive.) Also, the root
7913 type of a `const' qualified type or a `volatile' qualified type is the
7914 root type of the given type without the qualifiers. */
7917 root_type (tree type)
7919 if (TREE_CODE (type) == ERROR_MARK)
7920 return error_mark_node;
7922 switch (TREE_CODE (type))
7925 return error_mark_node;
7928 case REFERENCE_TYPE:
7929 return type_main_variant (root_type (TREE_TYPE (type)));
7932 return type_main_variant (type);
7936 /* Given a pointer to an arbitrary ..._TYPE tree node, return nonzero if the
7937 given input type is a Dwarf "fundamental" type. Otherwise return null. */
7940 is_base_type (tree type)
7942 switch (TREE_CODE (type))
7957 case QUAL_UNION_TYPE:
7962 case REFERENCE_TYPE:
7976 /* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
7977 node, return the size in bits for the type if it is a constant, or else
7978 return the alignment for the type if the type's size is not constant, or
7979 else return BITS_PER_WORD if the type actually turns out to be an
7982 static inline unsigned HOST_WIDE_INT
7983 simple_type_size_in_bits (tree type)
7985 if (TREE_CODE (type) == ERROR_MARK)
7986 return BITS_PER_WORD;
7987 else if (TYPE_SIZE (type) == NULL_TREE)
7989 else if (host_integerp (TYPE_SIZE (type), 1))
7990 return tree_low_cst (TYPE_SIZE (type), 1);
7992 return TYPE_ALIGN (type);
7995 /* Return true if the debug information for the given type should be
7996 emitted as a subrange type. */
7999 is_subrange_type (tree type)
8001 tree subtype = TREE_TYPE (type);
8003 if (TREE_CODE (type) == INTEGER_TYPE
8004 && subtype != NULL_TREE)
8006 if (TREE_CODE (subtype) == INTEGER_TYPE)
8008 if (TREE_CODE (subtype) == ENUMERAL_TYPE)
8014 /* Given a pointer to a tree node for a subrange type, return a pointer
8015 to a DIE that describes the given type. */
8018 subrange_type_die (tree type, dw_die_ref context_die)
8020 dw_die_ref subtype_die;
8021 dw_die_ref subrange_die;
8022 tree name = TYPE_NAME (type);
8023 const HOST_WIDE_INT size_in_bytes = int_size_in_bytes (type);
8025 if (context_die == NULL)
8026 context_die = comp_unit_die;
8028 if (TREE_CODE (TREE_TYPE (type)) == ENUMERAL_TYPE)
8029 subtype_die = gen_enumeration_type_die (TREE_TYPE (type), context_die);
8031 subtype_die = base_type_die (TREE_TYPE (type));
8033 subrange_die = new_die (DW_TAG_subrange_type, context_die, type);
8037 if (TREE_CODE (name) == TYPE_DECL)
8038 name = DECL_NAME (name);
8039 add_name_attribute (subrange_die, IDENTIFIER_POINTER (name));
8042 if (int_size_in_bytes (TREE_TYPE (type)) != size_in_bytes)
8044 /* The size of the subrange type and its base type do not match,
8045 so we need to generate a size attribute for the subrange type. */
8046 add_AT_unsigned (subrange_die, DW_AT_byte_size, size_in_bytes);
8049 if (TYPE_MIN_VALUE (type) != NULL)
8050 add_bound_info (subrange_die, DW_AT_lower_bound,
8051 TYPE_MIN_VALUE (type));
8052 if (TYPE_MAX_VALUE (type) != NULL)
8053 add_bound_info (subrange_die, DW_AT_upper_bound,
8054 TYPE_MAX_VALUE (type));
8055 add_AT_die_ref (subrange_die, DW_AT_type, subtype_die);
8057 return subrange_die;
8060 /* Given a pointer to an arbitrary ..._TYPE tree node, return a debugging
8061 entry that chains various modifiers in front of the given type. */
8064 modified_type_die (tree type, int is_const_type, int is_volatile_type,
8065 dw_die_ref context_die)
8067 enum tree_code code = TREE_CODE (type);
8068 dw_die_ref mod_type_die = NULL;
8069 dw_die_ref sub_die = NULL;
8070 tree item_type = NULL;
8072 if (code != ERROR_MARK)
8074 tree qualified_type;
8076 /* See if we already have the appropriately qualified variant of
8079 = get_qualified_type (type,
8080 ((is_const_type ? TYPE_QUAL_CONST : 0)
8082 ? TYPE_QUAL_VOLATILE : 0)));
8084 /* If we do, then we can just use its DIE, if it exists. */
8087 mod_type_die = lookup_type_die (qualified_type);
8089 return mod_type_die;
8092 /* Handle C typedef types. */
8093 if (qualified_type && TYPE_NAME (qualified_type)
8094 && TREE_CODE (TYPE_NAME (qualified_type)) == TYPE_DECL
8095 && DECL_ORIGINAL_TYPE (TYPE_NAME (qualified_type)))
8097 tree type_name = TYPE_NAME (qualified_type);
8098 tree dtype = TREE_TYPE (type_name);
8100 if (qualified_type == dtype)
8102 /* For a named type, use the typedef. */
8103 gen_type_die (qualified_type, context_die);
8104 mod_type_die = lookup_type_die (qualified_type);
8106 else if (is_const_type < TYPE_READONLY (dtype)
8107 || is_volatile_type < TYPE_VOLATILE (dtype))
8108 /* cv-unqualified version of named type. Just use the unnamed
8109 type to which it refers. */
8111 = modified_type_die (DECL_ORIGINAL_TYPE (type_name),
8112 is_const_type, is_volatile_type,
8115 /* Else cv-qualified version of named type; fall through. */
8121 else if (is_const_type)
8123 mod_type_die = new_die (DW_TAG_const_type, comp_unit_die, type);
8124 sub_die = modified_type_die (type, 0, is_volatile_type, context_die);
8126 else if (is_volatile_type)
8128 mod_type_die = new_die (DW_TAG_volatile_type, comp_unit_die, type);
8129 sub_die = modified_type_die (type, 0, 0, context_die);
8131 else if (code == POINTER_TYPE)
8133 mod_type_die = new_die (DW_TAG_pointer_type, comp_unit_die, type);
8134 add_AT_unsigned (mod_type_die, DW_AT_byte_size,
8135 simple_type_size_in_bits (type) / BITS_PER_UNIT);
8137 add_AT_unsigned (mod_type_die, DW_AT_address_class, 0);
8139 item_type = TREE_TYPE (type);
8141 else if (code == REFERENCE_TYPE)
8143 mod_type_die = new_die (DW_TAG_reference_type, comp_unit_die, type);
8144 add_AT_unsigned (mod_type_die, DW_AT_byte_size,
8145 simple_type_size_in_bits (type) / BITS_PER_UNIT);
8147 add_AT_unsigned (mod_type_die, DW_AT_address_class, 0);
8149 item_type = TREE_TYPE (type);
8151 else if (is_subrange_type (type))
8152 mod_type_die = subrange_type_die (type, context_die);
8153 else if (is_base_type (type))
8154 mod_type_die = base_type_die (type);
8157 gen_type_die (type, context_die);
8159 /* We have to get the type_main_variant here (and pass that to the
8160 `lookup_type_die' routine) because the ..._TYPE node we have
8161 might simply be a *copy* of some original type node (where the
8162 copy was created to help us keep track of typedef names) and
8163 that copy might have a different TYPE_UID from the original
8165 if (TREE_CODE (type) != VECTOR_TYPE)
8166 mod_type_die = lookup_type_die (type_main_variant (type));
8168 /* Vectors have the debugging information in the type,
8169 not the main variant. */
8170 mod_type_die = lookup_type_die (type);
8171 if (mod_type_die == NULL)
8175 /* We want to equate the qualified type to the die below. */
8176 type = qualified_type;
8180 equate_type_number_to_die (type, mod_type_die);
8182 /* We must do this after the equate_type_number_to_die call, in case
8183 this is a recursive type. This ensures that the modified_type_die
8184 recursion will terminate even if the type is recursive. Recursive
8185 types are possible in Ada. */
8186 sub_die = modified_type_die (item_type,
8187 TYPE_READONLY (item_type),
8188 TYPE_VOLATILE (item_type),
8191 if (sub_die != NULL)
8192 add_AT_die_ref (mod_type_die, DW_AT_type, sub_die);
8194 return mod_type_die;
8197 /* Given a pointer to an arbitrary ..._TYPE tree node, return true if it is
8198 an enumerated type. */
8201 type_is_enum (tree type)
8203 return TREE_CODE (type) == ENUMERAL_TYPE;
8206 /* Return the register number described by a given RTL node. */
8209 reg_number (rtx rtl)
8211 unsigned regno = REGNO (rtl);
8213 if (regno >= FIRST_PSEUDO_REGISTER)
8216 return DBX_REGISTER_NUMBER (regno);
8219 /* Return a location descriptor that designates a machine register or
8220 zero if there is none. */
8222 static dw_loc_descr_ref
8223 reg_loc_descriptor (rtx rtl)
8228 if (REGNO (rtl) >= FIRST_PSEUDO_REGISTER)
8231 reg = reg_number (rtl);
8232 regs = (*targetm.dwarf_register_span) (rtl);
8234 if (hard_regno_nregs[reg][GET_MODE (rtl)] > 1
8236 return multiple_reg_loc_descriptor (rtl, regs);
8238 return one_reg_loc_descriptor (reg);
8241 /* Return a location descriptor that designates a machine register for
8242 a given hard register number. */
8244 static dw_loc_descr_ref
8245 one_reg_loc_descriptor (unsigned int regno)
8248 return new_loc_descr (DW_OP_reg0 + regno, 0, 0);
8250 return new_loc_descr (DW_OP_regx, regno, 0);
8253 /* Given an RTL of a register, return a location descriptor that
8254 designates a value that spans more than one register. */
8256 static dw_loc_descr_ref
8257 multiple_reg_loc_descriptor (rtx rtl, rtx regs)
8261 dw_loc_descr_ref loc_result = NULL;
8263 reg = reg_number (rtl);
8264 nregs = hard_regno_nregs[reg][GET_MODE (rtl)];
8266 /* Simple, contiguous registers. */
8267 if (regs == NULL_RTX)
8269 size = GET_MODE_SIZE (GET_MODE (rtl)) / nregs;
8276 t = one_reg_loc_descriptor (reg);
8277 add_loc_descr (&loc_result, t);
8278 add_loc_descr (&loc_result, new_loc_descr (DW_OP_piece, size, 0));
8284 /* Now onto stupid register sets in non contiguous locations. */
8286 if (GET_CODE (regs) != PARALLEL)
8289 size = GET_MODE_SIZE (GET_MODE (XVECEXP (regs, 0, 0)));
8292 for (i = 0; i < XVECLEN (regs, 0); ++i)
8296 t = one_reg_loc_descriptor (REGNO (XVECEXP (regs, 0, i)));
8297 add_loc_descr (&loc_result, t);
8298 size = GET_MODE_SIZE (GET_MODE (XVECEXP (regs, 0, 0)));
8299 add_loc_descr (&loc_result, new_loc_descr (DW_OP_piece, size, 0));
8304 /* Return a location descriptor that designates a constant. */
8306 static dw_loc_descr_ref
8307 int_loc_descriptor (HOST_WIDE_INT i)
8309 enum dwarf_location_atom op;
8311 /* Pick the smallest representation of a constant, rather than just
8312 defaulting to the LEB encoding. */
8316 op = DW_OP_lit0 + i;
8319 else if (i <= 0xffff)
8321 else if (HOST_BITS_PER_WIDE_INT == 32
8331 else if (i >= -0x8000)
8333 else if (HOST_BITS_PER_WIDE_INT == 32
8334 || i >= -0x80000000)
8340 return new_loc_descr (op, i, 0);
8343 /* Return a location descriptor that designates a base+offset location. */
8345 static dw_loc_descr_ref
8346 based_loc_descr (unsigned int reg, HOST_WIDE_INT offset, bool can_use_fbreg)
8348 dw_loc_descr_ref loc_result;
8349 /* For the "frame base", we use the frame pointer or stack pointer
8350 registers, since the RTL for local variables is relative to one of
8352 unsigned fp_reg = DBX_REGISTER_NUMBER (frame_pointer_needed
8353 ? HARD_FRAME_POINTER_REGNUM
8354 : STACK_POINTER_REGNUM);
8356 if (reg == fp_reg && can_use_fbreg)
8357 loc_result = new_loc_descr (DW_OP_fbreg, offset, 0);
8359 loc_result = new_loc_descr (DW_OP_breg0 + reg, offset, 0);
8361 loc_result = new_loc_descr (DW_OP_bregx, reg, offset);
8366 /* Return true if this RTL expression describes a base+offset calculation. */
8369 is_based_loc (rtx rtl)
8371 return (GET_CODE (rtl) == PLUS
8372 && ((GET_CODE (XEXP (rtl, 0)) == REG
8373 && REGNO (XEXP (rtl, 0)) < FIRST_PSEUDO_REGISTER
8374 && GET_CODE (XEXP (rtl, 1)) == CONST_INT)));
8377 /* The following routine converts the RTL for a variable or parameter
8378 (resident in memory) into an equivalent Dwarf representation of a
8379 mechanism for getting the address of that same variable onto the top of a
8380 hypothetical "address evaluation" stack.
8382 When creating memory location descriptors, we are effectively transforming
8383 the RTL for a memory-resident object into its Dwarf postfix expression
8384 equivalent. This routine recursively descends an RTL tree, turning
8385 it into Dwarf postfix code as it goes.
8387 MODE is the mode of the memory reference, needed to handle some
8388 autoincrement addressing modes.
8390 CAN_USE_FBREG is a flag whether we can use DW_AT_frame_base in the location
8391 list for RTL. We can't use it when we are emitting location list for
8392 virtual variable frame_base_decl (i.e. a location list for DW_AT_frame_base)
8393 which describes how frame base changes when !frame_pointer_needed.
8395 Return 0 if we can't represent the location. */
8397 static dw_loc_descr_ref
8398 mem_loc_descriptor (rtx rtl, enum machine_mode mode, bool can_use_fbreg)
8400 dw_loc_descr_ref mem_loc_result = NULL;
8402 /* Note that for a dynamically sized array, the location we will generate a
8403 description of here will be the lowest numbered location which is
8404 actually within the array. That's *not* necessarily the same as the
8405 zeroth element of the array. */
8407 rtl = (*targetm.delegitimize_address) (rtl);
8409 switch (GET_CODE (rtl))
8414 /* POST_INC and POST_DEC can be handled just like a SUBREG. So we
8415 just fall into the SUBREG code. */
8417 /* ... fall through ... */
8420 /* The case of a subreg may arise when we have a local (register)
8421 variable or a formal (register) parameter which doesn't quite fill
8422 up an entire register. For now, just assume that it is
8423 legitimate to make the Dwarf info refer to the whole register which
8424 contains the given subreg. */
8425 rtl = SUBREG_REG (rtl);
8427 /* ... fall through ... */
8430 /* Whenever a register number forms a part of the description of the
8431 method for calculating the (dynamic) address of a memory resident
8432 object, DWARF rules require the register number be referred to as
8433 a "base register". This distinction is not based in any way upon
8434 what category of register the hardware believes the given register
8435 belongs to. This is strictly DWARF terminology we're dealing with
8436 here. Note that in cases where the location of a memory-resident
8437 data object could be expressed as: OP_ADD (OP_BASEREG (basereg),
8438 OP_CONST (0)) the actual DWARF location descriptor that we generate
8439 may just be OP_BASEREG (basereg). This may look deceptively like
8440 the object in question was allocated to a register (rather than in
8441 memory) so DWARF consumers need to be aware of the subtle
8442 distinction between OP_REG and OP_BASEREG. */
8443 if (REGNO (rtl) < FIRST_PSEUDO_REGISTER)
8444 mem_loc_result = based_loc_descr (reg_number (rtl), 0, can_use_fbreg);
8448 mem_loc_result = mem_loc_descriptor (XEXP (rtl, 0), GET_MODE (rtl),
8450 if (mem_loc_result != 0)
8451 add_loc_descr (&mem_loc_result, new_loc_descr (DW_OP_deref, 0, 0));
8455 rtl = XEXP (rtl, 1);
8457 /* ... fall through ... */
8460 /* Some ports can transform a symbol ref into a label ref, because
8461 the symbol ref is too far away and has to be dumped into a constant
8465 /* Alternatively, the symbol in the constant pool might be referenced
8466 by a different symbol. */
8467 if (GET_CODE (rtl) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (rtl))
8470 rtx tmp = get_pool_constant_mark (rtl, &marked);
8472 if (GET_CODE (tmp) == SYMBOL_REF)
8475 if (CONSTANT_POOL_ADDRESS_P (tmp))
8476 get_pool_constant_mark (tmp, &marked);
8481 /* If all references to this pool constant were optimized away,
8482 it was not output and thus we can't represent it.
8483 FIXME: might try to use DW_OP_const_value here, though
8484 DW_OP_piece complicates it. */
8489 mem_loc_result = new_loc_descr (DW_OP_addr, 0, 0);
8490 mem_loc_result->dw_loc_oprnd1.val_class = dw_val_class_addr;
8491 mem_loc_result->dw_loc_oprnd1.v.val_addr = rtl;
8492 VARRAY_PUSH_RTX (used_rtx_varray, rtl);
8496 /* Extract the PLUS expression nested inside and fall into
8498 rtl = XEXP (rtl, 1);
8503 /* Turn these into a PLUS expression and fall into the PLUS code
8505 rtl = gen_rtx_PLUS (word_mode, XEXP (rtl, 0),
8506 GEN_INT (GET_CODE (rtl) == PRE_INC
8507 ? GET_MODE_UNIT_SIZE (mode)
8508 : -GET_MODE_UNIT_SIZE (mode)));
8510 /* ... fall through ... */
8514 if (is_based_loc (rtl))
8515 mem_loc_result = based_loc_descr (reg_number (XEXP (rtl, 0)),
8516 INTVAL (XEXP (rtl, 1)),
8520 mem_loc_result = mem_loc_descriptor (XEXP (rtl, 0), mode,
8522 if (mem_loc_result == 0)
8525 if (GET_CODE (XEXP (rtl, 1)) == CONST_INT
8526 && INTVAL (XEXP (rtl, 1)) >= 0)
8527 add_loc_descr (&mem_loc_result,
8528 new_loc_descr (DW_OP_plus_uconst,
8529 INTVAL (XEXP (rtl, 1)), 0));
8532 add_loc_descr (&mem_loc_result,
8533 mem_loc_descriptor (XEXP (rtl, 1), mode,
8535 add_loc_descr (&mem_loc_result,
8536 new_loc_descr (DW_OP_plus, 0, 0));
8543 /* If a pseudo-reg is optimized away, it is possible for it to
8544 be replaced with a MEM containing a multiply. */
8545 dw_loc_descr_ref op0 = mem_loc_descriptor (XEXP (rtl, 0), mode,
8547 dw_loc_descr_ref op1 = mem_loc_descriptor (XEXP (rtl, 1), mode,
8550 if (op0 == 0 || op1 == 0)
8553 mem_loc_result = op0;
8554 add_loc_descr (&mem_loc_result, op1);
8555 add_loc_descr (&mem_loc_result, new_loc_descr (DW_OP_mul, 0, 0));
8560 mem_loc_result = int_loc_descriptor (INTVAL (rtl));
8564 /* If this is a MEM, return its address. Otherwise, we can't
8566 if (GET_CODE (XEXP (rtl, 0)) == MEM)
8567 return mem_loc_descriptor (XEXP (XEXP (rtl, 0), 0), mode,
8576 return mem_loc_result;
8579 /* Return a descriptor that describes the concatenation of two locations.
8580 This is typically a complex variable. */
8582 static dw_loc_descr_ref
8583 concat_loc_descriptor (rtx x0, rtx x1)
8585 dw_loc_descr_ref cc_loc_result = NULL;
8586 dw_loc_descr_ref x0_ref = loc_descriptor (x0, true);
8587 dw_loc_descr_ref x1_ref = loc_descriptor (x1, true);
8589 if (x0_ref == 0 || x1_ref == 0)
8592 cc_loc_result = x0_ref;
8593 add_loc_descr (&cc_loc_result,
8594 new_loc_descr (DW_OP_piece,
8595 GET_MODE_SIZE (GET_MODE (x0)), 0));
8597 add_loc_descr (&cc_loc_result, x1_ref);
8598 add_loc_descr (&cc_loc_result,
8599 new_loc_descr (DW_OP_piece,
8600 GET_MODE_SIZE (GET_MODE (x1)), 0));
8602 return cc_loc_result;
8605 /* Output a proper Dwarf location descriptor for a variable or parameter
8606 which is either allocated in a register or in a memory location. For a
8607 register, we just generate an OP_REG and the register number. For a
8608 memory location we provide a Dwarf postfix expression describing how to
8609 generate the (dynamic) address of the object onto the address stack.
8611 If we don't know how to describe it, return 0. */
8613 static dw_loc_descr_ref
8614 loc_descriptor (rtx rtl, bool can_use_fbreg)
8616 dw_loc_descr_ref loc_result = NULL;
8618 switch (GET_CODE (rtl))
8621 /* The case of a subreg may arise when we have a local (register)
8622 variable or a formal (register) parameter which doesn't quite fill
8623 up an entire register. For now, just assume that it is
8624 legitimate to make the Dwarf info refer to the whole register which
8625 contains the given subreg. */
8626 rtl = SUBREG_REG (rtl);
8628 /* ... fall through ... */
8631 loc_result = reg_loc_descriptor (rtl);
8635 loc_result = mem_loc_descriptor (XEXP (rtl, 0), GET_MODE (rtl),
8640 loc_result = concat_loc_descriptor (XEXP (rtl, 0), XEXP (rtl, 1));
8645 if (GET_CODE (XEXP (rtl, 1)) != PARALLEL)
8647 loc_result = loc_descriptor (XEXP (XEXP (rtl, 1), 0), can_use_fbreg);
8649 /* Multiple parts. */
8652 rtvec par_elems = XVEC (XEXP (rtl, 1), 0);
8653 int num_elem = GET_NUM_ELEM (par_elems);
8654 enum machine_mode mode;
8657 /* Create the first one, so we have something to add to. */
8658 loc_result = loc_descriptor (XEXP (RTVEC_ELT (par_elems, 0), 0),
8660 mode = GET_MODE (XEXP (RTVEC_ELT (par_elems, 0), 0));
8661 add_loc_descr (&loc_result,
8662 new_loc_descr (DW_OP_piece, GET_MODE_SIZE (mode), 0));
8663 for (i = 1; i < num_elem; i++)
8665 dw_loc_descr_ref temp;
8667 temp = loc_descriptor (XEXP (RTVEC_ELT (par_elems, i), 0),
8669 add_loc_descr (&loc_result, temp);
8670 mode = GET_MODE (XEXP (RTVEC_ELT (par_elems, i), 0));
8671 add_loc_descr (&loc_result,
8672 new_loc_descr (DW_OP_piece,
8673 GET_MODE_SIZE (mode), 0));
8685 /* Similar, but generate the descriptor from trees instead of rtl. This comes
8686 up particularly with variable length arrays. If ADDRESSP is nonzero, we are
8687 looking for an address. Otherwise, we return a value. If we can't make a
8688 descriptor, return 0. */
8690 static dw_loc_descr_ref
8691 loc_descriptor_from_tree (tree loc, int addressp)
8693 dw_loc_descr_ref ret, ret1;
8695 int unsignedp = TREE_UNSIGNED (TREE_TYPE (loc));
8696 enum dwarf_location_atom op;
8698 /* ??? Most of the time we do not take proper care for sign/zero
8699 extending the values properly. Hopefully this won't be a real
8702 switch (TREE_CODE (loc))
8707 case WITH_RECORD_EXPR:
8708 case PLACEHOLDER_EXPR:
8709 /* This case involves extracting fields from an object to determine the
8710 position of other fields. We don't try to encode this here. The
8711 only user of this is Ada, which encodes the needed information using
8712 the names of types. */
8719 /* We can support this only if we can look through conversions and
8720 find an INDIRECT_EXPR. */
8721 for (loc = TREE_OPERAND (loc, 0);
8722 TREE_CODE (loc) == CONVERT_EXPR || TREE_CODE (loc) == NOP_EXPR
8723 || TREE_CODE (loc) == NON_LVALUE_EXPR
8724 || TREE_CODE (loc) == VIEW_CONVERT_EXPR
8725 || TREE_CODE (loc) == SAVE_EXPR;
8726 loc = TREE_OPERAND (loc, 0))
8729 return (TREE_CODE (loc) == INDIRECT_REF
8730 ? loc_descriptor_from_tree (TREE_OPERAND (loc, 0), addressp)
8734 if (DECL_THREAD_LOCAL (loc))
8738 #ifndef ASM_OUTPUT_DWARF_DTPREL
8739 /* If this is not defined, we have no way to emit the data. */
8743 /* The way DW_OP_GNU_push_tls_address is specified, we can only
8744 look up addresses of objects in the current module. */
8745 if (DECL_EXTERNAL (loc))
8748 rtl = rtl_for_decl_location (loc);
8749 if (rtl == NULL_RTX)
8752 if (GET_CODE (rtl) != MEM)
8754 rtl = XEXP (rtl, 0);
8755 if (! CONSTANT_P (rtl))
8758 ret = new_loc_descr (INTERNAL_DW_OP_tls_addr, 0, 0);
8759 ret->dw_loc_oprnd1.val_class = dw_val_class_addr;
8760 ret->dw_loc_oprnd1.v.val_addr = rtl;
8762 ret1 = new_loc_descr (DW_OP_GNU_push_tls_address, 0, 0);
8763 add_loc_descr (&ret, ret1);
8772 rtx rtl = rtl_for_decl_location (loc);
8774 if (rtl == NULL_RTX)
8776 else if (CONSTANT_P (rtl))
8778 ret = new_loc_descr (DW_OP_addr, 0, 0);
8779 ret->dw_loc_oprnd1.val_class = dw_val_class_addr;
8780 ret->dw_loc_oprnd1.v.val_addr = rtl;
8785 enum machine_mode mode = GET_MODE (rtl);
8787 if (GET_CODE (rtl) == MEM)
8790 rtl = XEXP (rtl, 0);
8793 ret = mem_loc_descriptor (rtl, mode, true);
8799 ret = loc_descriptor_from_tree (TREE_OPERAND (loc, 0), 0);
8804 return loc_descriptor_from_tree (TREE_OPERAND (loc, 1), addressp);
8808 case NON_LVALUE_EXPR:
8809 case VIEW_CONVERT_EXPR:
8812 return loc_descriptor_from_tree (TREE_OPERAND (loc, 0), addressp);
8817 case ARRAY_RANGE_REF:
8820 HOST_WIDE_INT bitsize, bitpos, bytepos;
8821 enum machine_mode mode;
8824 obj = get_inner_reference (loc, &bitsize, &bitpos, &offset, &mode,
8825 &unsignedp, &volatilep);
8830 ret = loc_descriptor_from_tree (obj, 1);
8832 || bitpos % BITS_PER_UNIT != 0 || bitsize % BITS_PER_UNIT != 0)
8835 if (offset != NULL_TREE)
8837 /* Variable offset. */
8838 add_loc_descr (&ret, loc_descriptor_from_tree (offset, 0));
8839 add_loc_descr (&ret, new_loc_descr (DW_OP_plus, 0, 0));
8845 bytepos = bitpos / BITS_PER_UNIT;
8847 add_loc_descr (&ret, new_loc_descr (DW_OP_plus_uconst, bytepos, 0));
8848 else if (bytepos < 0)
8850 add_loc_descr (&ret, int_loc_descriptor (bytepos));
8851 add_loc_descr (&ret, new_loc_descr (DW_OP_plus, 0, 0));
8857 if (host_integerp (loc, 0))
8858 ret = int_loc_descriptor (tree_low_cst (loc, 0));
8865 /* Get an RTL for this, if something has been emitted. */
8866 rtx rtl = lookup_constant_def (loc);
8867 enum machine_mode mode;
8869 if (GET_CODE (rtl) != MEM)
8871 mode = GET_MODE (rtl);
8872 rtl = XEXP (rtl, 0);
8874 rtl = (*targetm.delegitimize_address) (rtl);
8877 ret = mem_loc_descriptor (rtl, mode, true);
8881 case TRUTH_AND_EXPR:
8882 case TRUTH_ANDIF_EXPR:
8887 case TRUTH_XOR_EXPR:
8893 case TRUTH_ORIF_EXPR:
8898 case FLOOR_DIV_EXPR:
8900 case ROUND_DIV_EXPR:
8901 case TRUNC_DIV_EXPR:
8909 case FLOOR_MOD_EXPR:
8911 case ROUND_MOD_EXPR:
8912 case TRUNC_MOD_EXPR:
8925 op = (unsignedp ? DW_OP_shr : DW_OP_shra);
8929 if (TREE_CODE (TREE_OPERAND (loc, 1)) == INTEGER_CST
8930 && host_integerp (TREE_OPERAND (loc, 1), 0))
8932 ret = loc_descriptor_from_tree (TREE_OPERAND (loc, 0), 0);
8936 add_loc_descr (&ret,
8937 new_loc_descr (DW_OP_plus_uconst,
8938 tree_low_cst (TREE_OPERAND (loc, 1),
8948 if (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc, 0))))
8955 if (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc, 0))))
8962 if (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc, 0))))
8969 if (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc, 0))))
8984 ret = loc_descriptor_from_tree (TREE_OPERAND (loc, 0), 0);
8985 ret1 = loc_descriptor_from_tree (TREE_OPERAND (loc, 1), 0);
8986 if (ret == 0 || ret1 == 0)
8989 add_loc_descr (&ret, ret1);
8990 add_loc_descr (&ret, new_loc_descr (op, 0, 0));
8993 case TRUTH_NOT_EXPR:
9007 ret = loc_descriptor_from_tree (TREE_OPERAND (loc, 0), 0);
9011 add_loc_descr (&ret, new_loc_descr (op, 0, 0));
9017 const enum tree_code code =
9018 TREE_CODE (loc) == MIN_EXPR ? GT_EXPR : LT_EXPR;
9020 loc = build (COND_EXPR, TREE_TYPE (loc),
9021 build (code, integer_type_node,
9022 TREE_OPERAND (loc, 0), TREE_OPERAND (loc, 1)),
9023 TREE_OPERAND (loc, 1), TREE_OPERAND (loc, 0));
9026 /* ... fall through ... */
9030 dw_loc_descr_ref lhs
9031 = loc_descriptor_from_tree (TREE_OPERAND (loc, 1), 0);
9032 dw_loc_descr_ref rhs
9033 = loc_descriptor_from_tree (TREE_OPERAND (loc, 2), 0);
9034 dw_loc_descr_ref bra_node, jump_node, tmp;
9036 ret = loc_descriptor_from_tree (TREE_OPERAND (loc, 0), 0);
9037 if (ret == 0 || lhs == 0 || rhs == 0)
9040 bra_node = new_loc_descr (DW_OP_bra, 0, 0);
9041 add_loc_descr (&ret, bra_node);
9043 add_loc_descr (&ret, rhs);
9044 jump_node = new_loc_descr (DW_OP_skip, 0, 0);
9045 add_loc_descr (&ret, jump_node);
9047 add_loc_descr (&ret, lhs);
9048 bra_node->dw_loc_oprnd1.val_class = dw_val_class_loc;
9049 bra_node->dw_loc_oprnd1.v.val_loc = lhs;
9051 /* ??? Need a node to point the skip at. Use a nop. */
9052 tmp = new_loc_descr (DW_OP_nop, 0, 0);
9053 add_loc_descr (&ret, tmp);
9054 jump_node->dw_loc_oprnd1.val_class = dw_val_class_loc;
9055 jump_node->dw_loc_oprnd1.v.val_loc = tmp;
9059 case EXPR_WITH_FILE_LOCATION:
9060 return loc_descriptor_from_tree (EXPR_WFL_NODE (loc), addressp);
9063 /* Leave front-end specific codes as simply unknown. This comes
9064 up, for instance, with the C STMT_EXPR. */
9065 if ((unsigned int) TREE_CODE (loc)
9066 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE)
9069 /* Otherwise this is a generic code; we should just lists all of
9070 these explicitly. Aborting means we forgot one. */
9074 /* Show if we can't fill the request for an address. */
9075 if (addressp && indirect_p == 0)
9078 /* If we've got an address and don't want one, dereference. */
9079 if (!addressp && indirect_p > 0)
9081 HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (loc));
9083 if (size > DWARF2_ADDR_SIZE || size == -1)
9085 else if (size == DWARF2_ADDR_SIZE)
9088 op = DW_OP_deref_size;
9090 add_loc_descr (&ret, new_loc_descr (op, size, 0));
9096 /* Given a value, round it up to the lowest multiple of `boundary'
9097 which is not less than the value itself. */
9099 static inline HOST_WIDE_INT
9100 ceiling (HOST_WIDE_INT value, unsigned int boundary)
9102 return (((value + boundary - 1) / boundary) * boundary);
9105 /* Given a pointer to what is assumed to be a FIELD_DECL node, return a
9106 pointer to the declared type for the relevant field variable, or return
9107 `integer_type_node' if the given node turns out to be an
9111 field_type (tree decl)
9115 if (TREE_CODE (decl) == ERROR_MARK)
9116 return integer_type_node;
9118 type = DECL_BIT_FIELD_TYPE (decl);
9119 if (type == NULL_TREE)
9120 type = TREE_TYPE (decl);
9125 /* Given a pointer to a tree node, return the alignment in bits for
9126 it, or else return BITS_PER_WORD if the node actually turns out to
9127 be an ERROR_MARK node. */
9129 static inline unsigned
9130 simple_type_align_in_bits (tree type)
9132 return (TREE_CODE (type) != ERROR_MARK) ? TYPE_ALIGN (type) : BITS_PER_WORD;
9135 static inline unsigned
9136 simple_decl_align_in_bits (tree decl)
9138 return (TREE_CODE (decl) != ERROR_MARK) ? DECL_ALIGN (decl) : BITS_PER_WORD;
9141 /* Given a pointer to a FIELD_DECL, compute and return the byte offset of the
9142 lowest addressed byte of the "containing object" for the given FIELD_DECL,
9143 or return 0 if we are unable to determine what that offset is, either
9144 because the argument turns out to be a pointer to an ERROR_MARK node, or
9145 because the offset is actually variable. (We can't handle the latter case
9148 static HOST_WIDE_INT
9149 field_byte_offset (tree decl)
9151 unsigned int type_align_in_bits;
9152 unsigned int decl_align_in_bits;
9153 unsigned HOST_WIDE_INT type_size_in_bits;
9154 HOST_WIDE_INT object_offset_in_bits;
9156 tree field_size_tree;
9157 HOST_WIDE_INT bitpos_int;
9158 HOST_WIDE_INT deepest_bitpos;
9159 unsigned HOST_WIDE_INT field_size_in_bits;
9161 if (TREE_CODE (decl) == ERROR_MARK)
9163 else if (TREE_CODE (decl) != FIELD_DECL)
9166 type = field_type (decl);
9167 field_size_tree = DECL_SIZE (decl);
9169 /* The size could be unspecified if there was an error, or for
9170 a flexible array member. */
9171 if (! field_size_tree)
9172 field_size_tree = bitsize_zero_node;
9174 /* We cannot yet cope with fields whose positions are variable, so
9175 for now, when we see such things, we simply return 0. Someday, we may
9176 be able to handle such cases, but it will be damn difficult. */
9177 if (! host_integerp (bit_position (decl), 0))
9180 bitpos_int = int_bit_position (decl);
9182 /* If we don't know the size of the field, pretend it's a full word. */
9183 if (host_integerp (field_size_tree, 1))
9184 field_size_in_bits = tree_low_cst (field_size_tree, 1);
9186 field_size_in_bits = BITS_PER_WORD;
9188 type_size_in_bits = simple_type_size_in_bits (type);
9189 type_align_in_bits = simple_type_align_in_bits (type);
9190 decl_align_in_bits = simple_decl_align_in_bits (decl);
9192 /* The GCC front-end doesn't make any attempt to keep track of the starting
9193 bit offset (relative to the start of the containing structure type) of the
9194 hypothetical "containing object" for a bit-field. Thus, when computing
9195 the byte offset value for the start of the "containing object" of a
9196 bit-field, we must deduce this information on our own. This can be rather
9197 tricky to do in some cases. For example, handling the following structure
9198 type definition when compiling for an i386/i486 target (which only aligns
9199 long long's to 32-bit boundaries) can be very tricky:
9201 struct S { int field1; long long field2:31; };
9203 Fortunately, there is a simple rule-of-thumb which can be used in such
9204 cases. When compiling for an i386/i486, GCC will allocate 8 bytes for the
9205 structure shown above. It decides to do this based upon one simple rule
9206 for bit-field allocation. GCC allocates each "containing object" for each
9207 bit-field at the first (i.e. lowest addressed) legitimate alignment
9208 boundary (based upon the required minimum alignment for the declared type
9209 of the field) which it can possibly use, subject to the condition that
9210 there is still enough available space remaining in the containing object
9211 (when allocated at the selected point) to fully accommodate all of the
9212 bits of the bit-field itself.
9214 This simple rule makes it obvious why GCC allocates 8 bytes for each
9215 object of the structure type shown above. When looking for a place to
9216 allocate the "containing object" for `field2', the compiler simply tries
9217 to allocate a 64-bit "containing object" at each successive 32-bit
9218 boundary (starting at zero) until it finds a place to allocate that 64-
9219 bit field such that at least 31 contiguous (and previously unallocated)
9220 bits remain within that selected 64 bit field. (As it turns out, for the
9221 example above, the compiler finds it is OK to allocate the "containing
9222 object" 64-bit field at bit-offset zero within the structure type.)
9224 Here we attempt to work backwards from the limited set of facts we're
9225 given, and we try to deduce from those facts, where GCC must have believed
9226 that the containing object started (within the structure type). The value
9227 we deduce is then used (by the callers of this routine) to generate
9228 DW_AT_location and DW_AT_bit_offset attributes for fields (both bit-fields
9229 and, in the case of DW_AT_location, regular fields as well). */
9231 /* Figure out the bit-distance from the start of the structure to the
9232 "deepest" bit of the bit-field. */
9233 deepest_bitpos = bitpos_int + field_size_in_bits;
9235 /* This is the tricky part. Use some fancy footwork to deduce where the
9236 lowest addressed bit of the containing object must be. */
9237 object_offset_in_bits = deepest_bitpos - type_size_in_bits;
9239 /* Round up to type_align by default. This works best for bitfields. */
9240 object_offset_in_bits += type_align_in_bits - 1;
9241 object_offset_in_bits /= type_align_in_bits;
9242 object_offset_in_bits *= type_align_in_bits;
9244 if (object_offset_in_bits > bitpos_int)
9246 /* Sigh, the decl must be packed. */
9247 object_offset_in_bits = deepest_bitpos - type_size_in_bits;
9249 /* Round up to decl_align instead. */
9250 object_offset_in_bits += decl_align_in_bits - 1;
9251 object_offset_in_bits /= decl_align_in_bits;
9252 object_offset_in_bits *= decl_align_in_bits;
9255 return object_offset_in_bits / BITS_PER_UNIT;
9258 /* The following routines define various Dwarf attributes and any data
9259 associated with them. */
9261 /* Add a location description attribute value to a DIE.
9263 This emits location attributes suitable for whole variables and
9264 whole parameters. Note that the location attributes for struct fields are
9265 generated by the routine `data_member_location_attribute' below. */
9268 add_AT_location_description (dw_die_ref die, enum dwarf_attribute attr_kind,
9269 dw_loc_descr_ref descr)
9272 add_AT_loc (die, attr_kind, descr);
9275 /* Attach the specialized form of location attribute used for data members of
9276 struct and union types. In the special case of a FIELD_DECL node which
9277 represents a bit-field, the "offset" part of this special location
9278 descriptor must indicate the distance in bytes from the lowest-addressed
9279 byte of the containing struct or union type to the lowest-addressed byte of
9280 the "containing object" for the bit-field. (See the `field_byte_offset'
9283 For any given bit-field, the "containing object" is a hypothetical object
9284 (of some integral or enum type) within which the given bit-field lives. The
9285 type of this hypothetical "containing object" is always the same as the
9286 declared type of the individual bit-field itself (for GCC anyway... the
9287 DWARF spec doesn't actually mandate this). Note that it is the size (in
9288 bytes) of the hypothetical "containing object" which will be given in the
9289 DW_AT_byte_size attribute for this bit-field. (See the
9290 `byte_size_attribute' function below.) It is also used when calculating the
9291 value of the DW_AT_bit_offset attribute. (See the `bit_offset_attribute'
9295 add_data_member_location_attribute (dw_die_ref die, tree decl)
9297 HOST_WIDE_INT offset;
9298 dw_loc_descr_ref loc_descr = 0;
9300 if (TREE_CODE (decl) == TREE_VEC)
9302 /* We're working on the TAG_inheritance for a base class. */
9303 if (TREE_VIA_VIRTUAL (decl) && is_cxx ())
9305 /* For C++ virtual bases we can't just use BINFO_OFFSET, as they
9306 aren't at a fixed offset from all (sub)objects of the same
9307 type. We need to extract the appropriate offset from our
9308 vtable. The following dwarf expression means
9310 BaseAddr = ObAddr + *((*ObAddr) - Offset)
9312 This is specific to the V3 ABI, of course. */
9314 dw_loc_descr_ref tmp;
9316 /* Make a copy of the object address. */
9317 tmp = new_loc_descr (DW_OP_dup, 0, 0);
9318 add_loc_descr (&loc_descr, tmp);
9320 /* Extract the vtable address. */
9321 tmp = new_loc_descr (DW_OP_deref, 0, 0);
9322 add_loc_descr (&loc_descr, tmp);
9324 /* Calculate the address of the offset. */
9325 offset = tree_low_cst (BINFO_VPTR_FIELD (decl), 0);
9329 tmp = int_loc_descriptor (-offset);
9330 add_loc_descr (&loc_descr, tmp);
9331 tmp = new_loc_descr (DW_OP_minus, 0, 0);
9332 add_loc_descr (&loc_descr, tmp);
9334 /* Extract the offset. */
9335 tmp = new_loc_descr (DW_OP_deref, 0, 0);
9336 add_loc_descr (&loc_descr, tmp);
9338 /* Add it to the object address. */
9339 tmp = new_loc_descr (DW_OP_plus, 0, 0);
9340 add_loc_descr (&loc_descr, tmp);
9343 offset = tree_low_cst (BINFO_OFFSET (decl), 0);
9346 offset = field_byte_offset (decl);
9350 enum dwarf_location_atom op;
9352 /* The DWARF2 standard says that we should assume that the structure
9353 address is already on the stack, so we can specify a structure field
9354 address by using DW_OP_plus_uconst. */
9356 #ifdef MIPS_DEBUGGING_INFO
9357 /* ??? The SGI dwarf reader does not handle the DW_OP_plus_uconst
9358 operator correctly. It works only if we leave the offset on the
9362 op = DW_OP_plus_uconst;
9365 loc_descr = new_loc_descr (op, offset, 0);
9368 add_AT_loc (die, DW_AT_data_member_location, loc_descr);
9371 /* Writes integer values to dw_vec_const array. */
9374 insert_int (HOST_WIDE_INT val, unsigned int size, unsigned char *dest)
9378 *dest++ = val & 0xff;
9384 /* Reads integers from dw_vec_const array. Inverse of insert_int. */
9386 static HOST_WIDE_INT
9387 extract_int (const unsigned char *src, unsigned int size)
9389 HOST_WIDE_INT val = 0;
9395 val |= *--src & 0xff;
9401 /* Writes floating point values to dw_vec_const array. */
9404 insert_float (rtx rtl, unsigned char *array)
9410 REAL_VALUE_FROM_CONST_DOUBLE (rv, rtl);
9411 real_to_target (val, &rv, GET_MODE (rtl));
9413 /* real_to_target puts 32-bit pieces in each long. Pack them. */
9414 for (i = 0; i < GET_MODE_SIZE (GET_MODE (rtl)) / 4; i++)
9416 insert_int (val[i], 4, array);
9421 /* Attach a DW_AT_const_value attribute for a variable or a parameter which
9422 does not have a "location" either in memory or in a register. These
9423 things can arise in GNU C when a constant is passed as an actual parameter
9424 to an inlined function. They can also arise in C++ where declared
9425 constants do not necessarily get memory "homes". */
9428 add_const_value_attribute (dw_die_ref die, rtx rtl)
9430 switch (GET_CODE (rtl))
9434 HOST_WIDE_INT val = INTVAL (rtl);
9437 add_AT_int (die, DW_AT_const_value, val);
9439 add_AT_unsigned (die, DW_AT_const_value, (unsigned HOST_WIDE_INT) val);
9444 /* Note that a CONST_DOUBLE rtx could represent either an integer or a
9445 floating-point constant. A CONST_DOUBLE is used whenever the
9446 constant requires more than one word in order to be adequately
9447 represented. We output CONST_DOUBLEs as blocks. */
9449 enum machine_mode mode = GET_MODE (rtl);
9451 if (GET_MODE_CLASS (mode) == MODE_FLOAT)
9453 unsigned int length = GET_MODE_SIZE (mode);
9454 unsigned char *array = ggc_alloc (length);
9456 insert_float (rtl, array);
9457 add_AT_vec (die, DW_AT_const_value, length / 4, 4, array);
9461 /* ??? We really should be using HOST_WIDE_INT throughout. */
9462 if (HOST_BITS_PER_LONG != HOST_BITS_PER_WIDE_INT)
9465 add_AT_long_long (die, DW_AT_const_value,
9466 CONST_DOUBLE_HIGH (rtl), CONST_DOUBLE_LOW (rtl));
9473 enum machine_mode mode = GET_MODE (rtl);
9474 unsigned int elt_size = GET_MODE_UNIT_SIZE (mode);
9475 unsigned int length = CONST_VECTOR_NUNITS (rtl);
9476 unsigned char *array = ggc_alloc (length * elt_size);
9480 if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT)
9482 for (i = 0, p = array; i < length; i++, p += elt_size)
9484 rtx elt = CONST_VECTOR_ELT (rtl, i);
9485 HOST_WIDE_INT lo, hi;
9486 if (GET_CODE (elt) == CONST_INT)
9491 else if (GET_CODE (elt) == CONST_DOUBLE)
9493 lo = CONST_DOUBLE_LOW (elt);
9494 hi = CONST_DOUBLE_HIGH (elt);
9499 if (elt_size <= sizeof (HOST_WIDE_INT))
9500 insert_int (lo, elt_size, p);
9501 else if (elt_size == 2 * sizeof (HOST_WIDE_INT))
9503 unsigned char *p0 = p;
9504 unsigned char *p1 = p + sizeof (HOST_WIDE_INT);
9506 if (WORDS_BIG_ENDIAN)
9511 insert_int (lo, sizeof (HOST_WIDE_INT), p0);
9512 insert_int (hi, sizeof (HOST_WIDE_INT), p1);
9518 else if (GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT)
9520 for (i = 0, p = array; i < length; i++, p += elt_size)
9522 rtx elt = CONST_VECTOR_ELT (rtl, i);
9523 insert_float (elt, p);
9529 add_AT_vec (die, DW_AT_const_value, length, elt_size, array);
9534 add_AT_string (die, DW_AT_const_value, XSTR (rtl, 0));
9540 add_AT_addr (die, DW_AT_const_value, rtl);
9541 VARRAY_PUSH_RTX (used_rtx_varray, rtl);
9545 /* In cases where an inlined instance of an inline function is passed
9546 the address of an `auto' variable (which is local to the caller) we
9547 can get a situation where the DECL_RTL of the artificial local
9548 variable (for the inlining) which acts as a stand-in for the
9549 corresponding formal parameter (of the inline function) will look
9550 like (plus:SI (reg:SI FRAME_PTR) (const_int ...)). This is not
9551 exactly a compile-time constant expression, but it isn't the address
9552 of the (artificial) local variable either. Rather, it represents the
9553 *value* which the artificial local variable always has during its
9554 lifetime. We currently have no way to represent such quasi-constant
9555 values in Dwarf, so for now we just punt and generate nothing. */
9559 /* No other kinds of rtx should be possible here. */
9566 rtl_for_decl_location (tree decl)
9570 /* Here we have to decide where we are going to say the parameter "lives"
9571 (as far as the debugger is concerned). We only have a couple of
9572 choices. GCC provides us with DECL_RTL and with DECL_INCOMING_RTL.
9574 DECL_RTL normally indicates where the parameter lives during most of the
9575 activation of the function. If optimization is enabled however, this
9576 could be either NULL or else a pseudo-reg. Both of those cases indicate
9577 that the parameter doesn't really live anywhere (as far as the code
9578 generation parts of GCC are concerned) during most of the function's
9579 activation. That will happen (for example) if the parameter is never
9580 referenced within the function.
9582 We could just generate a location descriptor here for all non-NULL
9583 non-pseudo values of DECL_RTL and ignore all of the rest, but we can be
9584 a little nicer than that if we also consider DECL_INCOMING_RTL in cases
9585 where DECL_RTL is NULL or is a pseudo-reg.
9587 Note however that we can only get away with using DECL_INCOMING_RTL as
9588 a backup substitute for DECL_RTL in certain limited cases. In cases
9589 where DECL_ARG_TYPE (decl) indicates the same type as TREE_TYPE (decl),
9590 we can be sure that the parameter was passed using the same type as it is
9591 declared to have within the function, and that its DECL_INCOMING_RTL
9592 points us to a place where a value of that type is passed.
9594 In cases where DECL_ARG_TYPE (decl) and TREE_TYPE (decl) are different,
9595 we cannot (in general) use DECL_INCOMING_RTL as a substitute for DECL_RTL
9596 because in these cases DECL_INCOMING_RTL points us to a value of some
9597 type which is *different* from the type of the parameter itself. Thus,
9598 if we tried to use DECL_INCOMING_RTL to generate a location attribute in
9599 such cases, the debugger would end up (for example) trying to fetch a
9600 `float' from a place which actually contains the first part of a
9601 `double'. That would lead to really incorrect and confusing
9602 output at debug-time.
9604 So, in general, we *do not* use DECL_INCOMING_RTL as a backup for DECL_RTL
9605 in cases where DECL_ARG_TYPE (decl) != TREE_TYPE (decl). There
9606 are a couple of exceptions however. On little-endian machines we can
9607 get away with using DECL_INCOMING_RTL even when DECL_ARG_TYPE (decl) is
9608 not the same as TREE_TYPE (decl), but only when DECL_ARG_TYPE (decl) is
9609 an integral type that is smaller than TREE_TYPE (decl). These cases arise
9610 when (on a little-endian machine) a non-prototyped function has a
9611 parameter declared to be of type `short' or `char'. In such cases,
9612 TREE_TYPE (decl) will be `short' or `char', DECL_ARG_TYPE (decl) will
9613 be `int', and DECL_INCOMING_RTL will point to the lowest-order byte of the
9614 passed `int' value. If the debugger then uses that address to fetch
9615 a `short' or a `char' (on a little-endian machine) the result will be
9616 the correct data, so we allow for such exceptional cases below.
9618 Note that our goal here is to describe the place where the given formal
9619 parameter lives during most of the function's activation (i.e. between the
9620 end of the prologue and the start of the epilogue). We'll do that as best
9621 as we can. Note however that if the given formal parameter is modified
9622 sometime during the execution of the function, then a stack backtrace (at
9623 debug-time) will show the function as having been called with the *new*
9624 value rather than the value which was originally passed in. This happens
9625 rarely enough that it is not a major problem, but it *is* a problem, and
9628 A future version of dwarf2out.c may generate two additional attributes for
9629 any given DW_TAG_formal_parameter DIE which will describe the "passed
9630 type" and the "passed location" for the given formal parameter in addition
9631 to the attributes we now generate to indicate the "declared type" and the
9632 "active location" for each parameter. This additional set of attributes
9633 could be used by debuggers for stack backtraces. Separately, note that
9634 sometimes DECL_RTL can be NULL and DECL_INCOMING_RTL can be NULL also.
9635 This happens (for example) for inlined-instances of inline function formal
9636 parameters which are never referenced. This really shouldn't be
9637 happening. All PARM_DECL nodes should get valid non-NULL
9638 DECL_INCOMING_RTL values, but integrate.c doesn't currently generate these
9639 values for inlined instances of inline function parameters, so when we see
9640 such cases, we are just out-of-luck for the time being (until integrate.c
9643 /* Use DECL_RTL as the "location" unless we find something better. */
9644 rtl = DECL_RTL_IF_SET (decl);
9646 /* When generating abstract instances, ignore everything except
9647 constants, symbols living in memory, and symbols living in
9649 if (! reload_completed)
9652 && (CONSTANT_P (rtl)
9653 || (GET_CODE (rtl) == MEM
9654 && CONSTANT_P (XEXP (rtl, 0)))
9655 || (GET_CODE (rtl) == REG
9656 && TREE_CODE (decl) == VAR_DECL
9657 && TREE_STATIC (decl))))
9659 rtl = (*targetm.delegitimize_address) (rtl);
9664 else if (TREE_CODE (decl) == PARM_DECL)
9666 if (rtl == NULL_RTX || is_pseudo_reg (rtl))
9668 tree declared_type = type_main_variant (TREE_TYPE (decl));
9669 tree passed_type = type_main_variant (DECL_ARG_TYPE (decl));
9671 /* This decl represents a formal parameter which was optimized out.
9672 Note that DECL_INCOMING_RTL may be NULL in here, but we handle
9673 all cases where (rtl == NULL_RTX) just below. */
9674 if (declared_type == passed_type)
9675 rtl = DECL_INCOMING_RTL (decl);
9676 else if (! BYTES_BIG_ENDIAN
9677 && TREE_CODE (declared_type) == INTEGER_TYPE
9678 && (GET_MODE_SIZE (TYPE_MODE (declared_type))
9679 <= GET_MODE_SIZE (TYPE_MODE (passed_type))))
9680 rtl = DECL_INCOMING_RTL (decl);
9683 /* If the parm was passed in registers, but lives on the stack, then
9684 make a big endian correction if the mode of the type of the
9685 parameter is not the same as the mode of the rtl. */
9686 /* ??? This is the same series of checks that are made in dbxout.c before
9687 we reach the big endian correction code there. It isn't clear if all
9688 of these checks are necessary here, but keeping them all is the safe
9690 else if (GET_CODE (rtl) == MEM
9691 && XEXP (rtl, 0) != const0_rtx
9692 && ! CONSTANT_P (XEXP (rtl, 0))
9693 /* Not passed in memory. */
9694 && GET_CODE (DECL_INCOMING_RTL (decl)) != MEM
9695 /* Not passed by invisible reference. */
9696 && (GET_CODE (XEXP (rtl, 0)) != REG
9697 || REGNO (XEXP (rtl, 0)) == HARD_FRAME_POINTER_REGNUM
9698 || REGNO (XEXP (rtl, 0)) == STACK_POINTER_REGNUM
9699 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
9700 || REGNO (XEXP (rtl, 0)) == ARG_POINTER_REGNUM
9703 /* Big endian correction check. */
9705 && TYPE_MODE (TREE_TYPE (decl)) != GET_MODE (rtl)
9706 && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (decl)))
9709 int offset = (UNITS_PER_WORD
9710 - GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (decl))));
9712 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (decl)),
9713 plus_constant (XEXP (rtl, 0), offset));
9717 if (rtl != NULL_RTX)
9719 rtl = eliminate_regs (rtl, 0, NULL_RTX);
9720 #ifdef LEAF_REG_REMAP
9721 if (current_function_uses_only_leaf_regs)
9722 leaf_renumber_regs_insn (rtl);
9726 /* A variable with no DECL_RTL but a DECL_INITIAL is a compile-time constant,
9727 and will have been substituted directly into all expressions that use it.
9728 C does not have such a concept, but C++ and other languages do. */
9729 else if (TREE_CODE (decl) == VAR_DECL && DECL_INITIAL (decl))
9731 /* If a variable is initialized with a string constant without embedded
9732 zeros, build CONST_STRING. */
9733 if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
9734 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
9736 tree arrtype = TREE_TYPE (decl);
9737 tree enttype = TREE_TYPE (arrtype);
9738 tree domain = TYPE_DOMAIN (arrtype);
9739 tree init = DECL_INITIAL (decl);
9740 enum machine_mode mode = TYPE_MODE (enttype);
9742 if (GET_MODE_CLASS (mode) == MODE_INT && GET_MODE_SIZE (mode) == 1
9744 && integer_zerop (TYPE_MIN_VALUE (domain))
9745 && compare_tree_int (TYPE_MAX_VALUE (domain),
9746 TREE_STRING_LENGTH (init) - 1) == 0
9747 && ((size_t) TREE_STRING_LENGTH (init)
9748 == strlen (TREE_STRING_POINTER (init)) + 1))
9749 rtl = gen_rtx_CONST_STRING (VOIDmode, TREE_STRING_POINTER (init));
9751 /* If the initializer is something that we know will expand into an
9752 immediate RTL constant, expand it now. Expanding anything else
9753 tends to produce unresolved symbols; see debug/5770 and c++/6381. */
9754 else if (TREE_CODE (DECL_INITIAL (decl)) == INTEGER_CST
9755 || TREE_CODE (DECL_INITIAL (decl)) == REAL_CST)
9757 rtl = expand_expr (DECL_INITIAL (decl), NULL_RTX, VOIDmode,
9758 EXPAND_INITIALIZER);
9759 /* If expand_expr returns a MEM, it wasn't immediate. */
9760 if (rtl && GET_CODE (rtl) == MEM)
9766 rtl = (*targetm.delegitimize_address) (rtl);
9768 /* If we don't look past the constant pool, we risk emitting a
9769 reference to a constant pool entry that isn't referenced from
9770 code, and thus is not emitted. */
9772 rtl = avoid_constant_pool_reference (rtl);
9777 /* Generate *either* a DW_AT_location attribute or else a DW_AT_const_value
9778 data attribute for a variable or a parameter. We generate the
9779 DW_AT_const_value attribute only in those cases where the given variable
9780 or parameter does not have a true "location" either in memory or in a
9781 register. This can happen (for example) when a constant is passed as an
9782 actual argument in a call to an inline function. (It's possible that
9783 these things can crop up in other ways also.) Note that one type of
9784 constant value which can be passed into an inlined function is a constant
9785 pointer. This can happen for example if an actual argument in an inlined
9786 function call evaluates to a compile-time constant address. */
9789 add_location_or_const_value_attribute (dw_die_ref die, tree decl,
9790 enum dwarf_attribute attr)
9793 dw_loc_descr_ref descr;
9794 var_loc_list *loc_list;
9796 if (TREE_CODE (decl) == ERROR_MARK)
9798 else if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != PARM_DECL)
9801 /* See if we possibly have multiple locations for this variable. */
9802 loc_list = lookup_decl_loc (decl);
9804 /* If it truly has multiple locations, the first and last node will
9806 if (loc_list && loc_list->first != loc_list->last)
9808 const char *secname;
9809 const char *endname;
9810 dw_loc_list_ref list;
9812 struct var_loc_node *node;
9814 /* We need to figure out what section we should use as the base
9815 for the address ranges where a given location is valid.
9816 1. If this particular DECL has a section associated with it,
9818 2. If this function has a section associated with it, use
9820 3. Otherwise, use the text section.
9821 XXX: If you split a variable across multiple sections, this
9824 if (DECL_SECTION_NAME (decl))
9826 tree sectree = DECL_SECTION_NAME (decl);
9827 secname = TREE_STRING_POINTER (sectree);
9829 else if (current_function_decl
9830 && DECL_SECTION_NAME (current_function_decl))
9832 tree sectree = DECL_SECTION_NAME (current_function_decl);
9833 secname = TREE_STRING_POINTER (sectree);
9836 secname = text_section_label;
9838 /* Now that we know what section we are using for a base,
9839 actually construct the list of locations.
9840 The first location information is what is passed to the
9841 function that creates the location list, and the remaining
9842 locations just get added on to that list.
9843 Note that we only know the start address for a location
9844 (IE location changes), so to build the range, we use
9845 the range [current location start, next location start].
9846 This means we have to special case the last node, and generate
9847 a range of [last location start, end of function label]. */
9849 node = loc_list->first;
9850 varloc = NOTE_VAR_LOCATION (node->var_loc_note);
9851 list = new_loc_list (loc_descriptor (varloc, attr != DW_AT_frame_base),
9852 node->label, node->next->label, secname, 1);
9855 for (; node->next; node = node->next)
9856 if (NOTE_VAR_LOCATION_LOC (node->var_loc_note) != NULL_RTX)
9858 /* The variable has a location between NODE->LABEL and
9859 NODE->NEXT->LABEL. */
9860 varloc = NOTE_VAR_LOCATION (node->var_loc_note);
9861 add_loc_descr_to_loc_list (&list,
9862 loc_descriptor (varloc,
9863 attr != DW_AT_frame_base),
9864 node->label, node->next->label, secname);
9867 /* If the variable has a location at the last label
9868 it keeps its location until the end of function. */
9869 if (NOTE_VAR_LOCATION_LOC (node->var_loc_note) != NULL_RTX)
9871 char label_id[MAX_ARTIFICIAL_LABEL_BYTES];
9873 varloc = NOTE_VAR_LOCATION (node->var_loc_note);
9874 if (!current_function_decl)
9875 endname = text_end_label;
9878 ASM_GENERATE_INTERNAL_LABEL (label_id, FUNC_END_LABEL,
9879 current_function_funcdef_no);
9880 endname = ggc_strdup (label_id);
9882 add_loc_descr_to_loc_list (&list,
9883 loc_descriptor (varloc,
9884 attr != DW_AT_frame_base),
9885 node->label, endname, secname);
9888 /* Finally, add the location list to the DIE, and we are done. */
9889 add_AT_loc_list (die, attr, list);
9893 rtl = rtl_for_decl_location (decl);
9894 if (rtl == NULL_RTX)
9897 switch (GET_CODE (rtl))
9900 /* The address of a variable that was optimized away;
9901 don't emit anything. */
9912 /* DECL_RTL could be (plus (reg ...) (const_int ...)) */
9913 add_const_value_attribute (die, rtl);
9917 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL (decl))
9919 /* Need loc_descriptor_from_tree since that's where we know
9920 how to handle TLS variables. Want the object's address
9921 since the top-level DW_AT_location assumes such. See
9922 the confusion in loc_descriptor for reference. */
9923 descr = loc_descriptor_from_tree (decl, 1);
9930 descr = loc_descriptor (rtl, true);
9932 add_AT_location_description (die, attr, descr);
9937 rtvec par_elems = XVEC (rtl, 0);
9938 int num_elem = GET_NUM_ELEM (par_elems);
9939 enum machine_mode mode;
9942 /* Create the first one, so we have something to add to. */
9943 descr = loc_descriptor (XEXP (RTVEC_ELT (par_elems, 0), 0), true);
9944 mode = GET_MODE (XEXP (RTVEC_ELT (par_elems, 0), 0));
9945 add_loc_descr (&descr,
9946 new_loc_descr (DW_OP_piece, GET_MODE_SIZE (mode), 0));
9947 for (i = 1; i < num_elem; i++)
9949 dw_loc_descr_ref temp;
9951 temp = loc_descriptor (XEXP (RTVEC_ELT (par_elems, i), 0), true);
9952 add_loc_descr (&descr, temp);
9953 mode = GET_MODE (XEXP (RTVEC_ELT (par_elems, i), 0));
9954 add_loc_descr (&descr,
9955 new_loc_descr (DW_OP_piece,
9956 GET_MODE_SIZE (mode), 0));
9959 add_AT_location_description (die, DW_AT_location, descr);
9967 /* If we don't have a copy of this variable in memory for some reason (such
9968 as a C++ member constant that doesn't have an out-of-line definition),
9969 we should tell the debugger about the constant value. */
9972 tree_add_const_value_attribute (dw_die_ref var_die, tree decl)
9974 tree init = DECL_INITIAL (decl);
9975 tree type = TREE_TYPE (decl);
9977 if (TREE_READONLY (decl) && ! TREE_THIS_VOLATILE (decl) && init
9978 && initializer_constant_valid_p (init, type) == null_pointer_node)
9983 switch (TREE_CODE (type))
9986 if (host_integerp (init, 0))
9987 add_AT_unsigned (var_die, DW_AT_const_value,
9988 tree_low_cst (init, 0));
9990 add_AT_long_long (var_die, DW_AT_const_value,
9991 TREE_INT_CST_HIGH (init),
9992 TREE_INT_CST_LOW (init));
9999 /* Generate a DW_AT_name attribute given some string value to be included as
10000 the value of the attribute. */
10003 add_name_attribute (dw_die_ref die, const char *name_string)
10005 if (name_string != NULL && *name_string != 0)
10007 if (demangle_name_func)
10008 name_string = (*demangle_name_func) (name_string);
10010 add_AT_string (die, DW_AT_name, name_string);
10014 /* Generate a DW_AT_comp_dir attribute for DIE. */
10017 add_comp_dir_attribute (dw_die_ref die)
10019 const char *wd = get_src_pwd ();
10021 add_AT_string (die, DW_AT_comp_dir, wd);
10024 /* Given a tree node describing an array bound (either lower or upper) output
10025 a representation for that bound. */
10028 add_bound_info (dw_die_ref subrange_die, enum dwarf_attribute bound_attr, tree bound)
10030 switch (TREE_CODE (bound))
10035 /* All fixed-bounds are represented by INTEGER_CST nodes. */
10037 if (! host_integerp (bound, 0)
10038 || (bound_attr == DW_AT_lower_bound
10039 && (((is_c_family () || is_java ()) && integer_zerop (bound))
10040 || (is_fortran () && integer_onep (bound)))))
10041 /* Use the default. */
10044 add_AT_unsigned (subrange_die, bound_attr, tree_low_cst (bound, 0));
10049 case NON_LVALUE_EXPR:
10050 case VIEW_CONVERT_EXPR:
10051 add_bound_info (subrange_die, bound_attr, TREE_OPERAND (bound, 0));
10055 /* If optimization is turned on, the SAVE_EXPRs that describe how to
10056 access the upper bound values may be bogus. If they refer to a
10057 register, they may only describe how to get at these values at the
10058 points in the generated code right after they have just been
10059 computed. Worse yet, in the typical case, the upper bound values
10060 will not even *be* computed in the optimized code (though the
10061 number of elements will), so these SAVE_EXPRs are entirely
10062 bogus. In order to compensate for this fact, we check here to see
10063 if optimization is enabled, and if so, we don't add an attribute
10064 for the (unknown and unknowable) upper bound. This should not
10065 cause too much trouble for existing (stupid?) debuggers because
10066 they have to deal with empty upper bounds location descriptions
10067 anyway in order to be able to deal with incomplete array types.
10068 Of course an intelligent debugger (GDB?) should be able to
10069 comprehend that a missing upper bound specification in an array
10070 type used for a storage class `auto' local array variable
10071 indicates that the upper bound is both unknown (at compile- time)
10072 and unknowable (at run-time) due to optimization.
10074 We assume that a MEM rtx is safe because gcc wouldn't put the
10075 value there unless it was going to be used repeatedly in the
10076 function, i.e. for cleanups. */
10077 if (SAVE_EXPR_RTL (bound)
10078 && (! optimize || GET_CODE (SAVE_EXPR_RTL (bound)) == MEM))
10080 dw_die_ref ctx = lookup_decl_die (current_function_decl);
10081 dw_die_ref decl_die = new_die (DW_TAG_variable, ctx, bound);
10082 rtx loc = SAVE_EXPR_RTL (bound);
10084 /* If the RTL for the SAVE_EXPR is memory, handle the case where
10085 it references an outer function's frame. */
10086 if (GET_CODE (loc) == MEM)
10088 rtx new_addr = fix_lexical_addr (XEXP (loc, 0), bound);
10090 if (XEXP (loc, 0) != new_addr)
10091 loc = gen_rtx_MEM (GET_MODE (loc), new_addr);
10094 add_AT_flag (decl_die, DW_AT_artificial, 1);
10095 add_type_attribute (decl_die, TREE_TYPE (bound), 1, 0, ctx);
10096 add_AT_location_description (decl_die, DW_AT_location,
10097 loc_descriptor (loc, true));
10098 add_AT_die_ref (subrange_die, bound_attr, decl_die);
10101 /* Else leave out the attribute. */
10107 dw_die_ref decl_die = lookup_decl_die (bound);
10109 /* ??? Can this happen, or should the variable have been bound
10110 first? Probably it can, since I imagine that we try to create
10111 the types of parameters in the order in which they exist in
10112 the list, and won't have created a forward reference to a
10113 later parameter. */
10114 if (decl_die != NULL)
10115 add_AT_die_ref (subrange_die, bound_attr, decl_die);
10121 /* Otherwise try to create a stack operation procedure to
10122 evaluate the value of the array bound. */
10124 dw_die_ref ctx, decl_die;
10125 dw_loc_descr_ref loc;
10127 loc = loc_descriptor_from_tree (bound, 0);
10131 if (current_function_decl == 0)
10132 ctx = comp_unit_die;
10134 ctx = lookup_decl_die (current_function_decl);
10136 /* If we weren't able to find a context, it's most likely the case
10137 that we are processing the return type of the function. So
10138 make a SAVE_EXPR to point to it and have the limbo DIE code
10139 find the proper die. The save_expr function doesn't always
10140 make a SAVE_EXPR, so do it ourselves. */
10142 bound = build (SAVE_EXPR, TREE_TYPE (bound), bound,
10143 current_function_decl, NULL_TREE);
10145 decl_die = new_die (DW_TAG_variable, ctx, bound);
10146 add_AT_flag (decl_die, DW_AT_artificial, 1);
10147 add_type_attribute (decl_die, TREE_TYPE (bound), 1, 0, ctx);
10148 add_AT_loc (decl_die, DW_AT_location, loc);
10150 add_AT_die_ref (subrange_die, bound_attr, decl_die);
10156 /* Note that the block of subscript information for an array type also
10157 includes information about the element type of type given array type. */
10160 add_subscript_info (dw_die_ref type_die, tree type)
10162 #ifndef MIPS_DEBUGGING_INFO
10163 unsigned dimension_number;
10166 dw_die_ref subrange_die;
10168 /* The GNU compilers represent multidimensional array types as sequences of
10169 one dimensional array types whose element types are themselves array
10170 types. Here we squish that down, so that each multidimensional array
10171 type gets only one array_type DIE in the Dwarf debugging info. The draft
10172 Dwarf specification say that we are allowed to do this kind of
10173 compression in C (because there is no difference between an array or
10174 arrays and a multidimensional array in C) but for other source languages
10175 (e.g. Ada) we probably shouldn't do this. */
10177 /* ??? The SGI dwarf reader fails for multidimensional arrays with a
10178 const enum type. E.g. const enum machine_mode insn_operand_mode[2][10].
10179 We work around this by disabling this feature. See also
10180 gen_array_type_die. */
10181 #ifndef MIPS_DEBUGGING_INFO
10182 for (dimension_number = 0;
10183 TREE_CODE (type) == ARRAY_TYPE;
10184 type = TREE_TYPE (type), dimension_number++)
10187 tree domain = TYPE_DOMAIN (type);
10189 /* Arrays come in three flavors: Unspecified bounds, fixed bounds,
10190 and (in GNU C only) variable bounds. Handle all three forms
10192 subrange_die = new_die (DW_TAG_subrange_type, type_die, NULL);
10195 /* We have an array type with specified bounds. */
10196 lower = TYPE_MIN_VALUE (domain);
10197 upper = TYPE_MAX_VALUE (domain);
10199 /* Define the index type. */
10200 if (TREE_TYPE (domain))
10202 /* ??? This is probably an Ada unnamed subrange type. Ignore the
10203 TREE_TYPE field. We can't emit debug info for this
10204 because it is an unnamed integral type. */
10205 if (TREE_CODE (domain) == INTEGER_TYPE
10206 && TYPE_NAME (domain) == NULL_TREE
10207 && TREE_CODE (TREE_TYPE (domain)) == INTEGER_TYPE
10208 && TYPE_NAME (TREE_TYPE (domain)) == NULL_TREE)
10211 add_type_attribute (subrange_die, TREE_TYPE (domain), 0, 0,
10215 /* ??? If upper is NULL, the array has unspecified length,
10216 but it does have a lower bound. This happens with Fortran
10218 Since the debugger is definitely going to need to know N
10219 to produce useful results, go ahead and output the lower
10220 bound solo, and hope the debugger can cope. */
10222 add_bound_info (subrange_die, DW_AT_lower_bound, lower);
10224 add_bound_info (subrange_die, DW_AT_upper_bound, upper);
10227 /* Otherwise we have an array type with an unspecified length. The
10228 DWARF-2 spec does not say how to handle this; let's just leave out the
10234 add_byte_size_attribute (dw_die_ref die, tree tree_node)
10238 switch (TREE_CODE (tree_node))
10243 case ENUMERAL_TYPE:
10246 case QUAL_UNION_TYPE:
10247 size = int_size_in_bytes (tree_node);
10250 /* For a data member of a struct or union, the DW_AT_byte_size is
10251 generally given as the number of bytes normally allocated for an
10252 object of the *declared* type of the member itself. This is true
10253 even for bit-fields. */
10254 size = simple_type_size_in_bits (field_type (tree_node)) / BITS_PER_UNIT;
10260 /* Note that `size' might be -1 when we get to this point. If it is, that
10261 indicates that the byte size of the entity in question is variable. We
10262 have no good way of expressing this fact in Dwarf at the present time,
10263 so just let the -1 pass on through. */
10264 add_AT_unsigned (die, DW_AT_byte_size, size);
10267 /* For a FIELD_DECL node which represents a bit-field, output an attribute
10268 which specifies the distance in bits from the highest order bit of the
10269 "containing object" for the bit-field to the highest order bit of the
10272 For any given bit-field, the "containing object" is a hypothetical object
10273 (of some integral or enum type) within which the given bit-field lives. The
10274 type of this hypothetical "containing object" is always the same as the
10275 declared type of the individual bit-field itself. The determination of the
10276 exact location of the "containing object" for a bit-field is rather
10277 complicated. It's handled by the `field_byte_offset' function (above).
10279 Note that it is the size (in bytes) of the hypothetical "containing object"
10280 which will be given in the DW_AT_byte_size attribute for this bit-field.
10281 (See `byte_size_attribute' above). */
10284 add_bit_offset_attribute (dw_die_ref die, tree decl)
10286 HOST_WIDE_INT object_offset_in_bytes = field_byte_offset (decl);
10287 tree type = DECL_BIT_FIELD_TYPE (decl);
10288 HOST_WIDE_INT bitpos_int;
10289 HOST_WIDE_INT highest_order_object_bit_offset;
10290 HOST_WIDE_INT highest_order_field_bit_offset;
10291 HOST_WIDE_INT unsigned bit_offset;
10293 /* Must be a field and a bit field. */
10295 || TREE_CODE (decl) != FIELD_DECL)
10298 /* We can't yet handle bit-fields whose offsets are variable, so if we
10299 encounter such things, just return without generating any attribute
10300 whatsoever. Likewise for variable or too large size. */
10301 if (! host_integerp (bit_position (decl), 0)
10302 || ! host_integerp (DECL_SIZE (decl), 1))
10305 bitpos_int = int_bit_position (decl);
10307 /* Note that the bit offset is always the distance (in bits) from the
10308 highest-order bit of the "containing object" to the highest-order bit of
10309 the bit-field itself. Since the "high-order end" of any object or field
10310 is different on big-endian and little-endian machines, the computation
10311 below must take account of these differences. */
10312 highest_order_object_bit_offset = object_offset_in_bytes * BITS_PER_UNIT;
10313 highest_order_field_bit_offset = bitpos_int;
10315 if (! BYTES_BIG_ENDIAN)
10317 highest_order_field_bit_offset += tree_low_cst (DECL_SIZE (decl), 0);
10318 highest_order_object_bit_offset += simple_type_size_in_bits (type);
10322 = (! BYTES_BIG_ENDIAN
10323 ? highest_order_object_bit_offset - highest_order_field_bit_offset
10324 : highest_order_field_bit_offset - highest_order_object_bit_offset);
10326 add_AT_unsigned (die, DW_AT_bit_offset, bit_offset);
10329 /* For a FIELD_DECL node which represents a bit field, output an attribute
10330 which specifies the length in bits of the given field. */
10333 add_bit_size_attribute (dw_die_ref die, tree decl)
10335 /* Must be a field and a bit field. */
10336 if (TREE_CODE (decl) != FIELD_DECL
10337 || ! DECL_BIT_FIELD_TYPE (decl))
10340 if (host_integerp (DECL_SIZE (decl), 1))
10341 add_AT_unsigned (die, DW_AT_bit_size, tree_low_cst (DECL_SIZE (decl), 1));
10344 /* If the compiled language is ANSI C, then add a 'prototyped'
10345 attribute, if arg types are given for the parameters of a function. */
10348 add_prototyped_attribute (dw_die_ref die, tree func_type)
10350 if (get_AT_unsigned (comp_unit_die, DW_AT_language) == DW_LANG_C89
10351 && TYPE_ARG_TYPES (func_type) != NULL)
10352 add_AT_flag (die, DW_AT_prototyped, 1);
10355 /* Add an 'abstract_origin' attribute below a given DIE. The DIE is found
10356 by looking in either the type declaration or object declaration
10360 add_abstract_origin_attribute (dw_die_ref die, tree origin)
10362 dw_die_ref origin_die = NULL;
10364 if (TREE_CODE (origin) != FUNCTION_DECL)
10366 /* We may have gotten separated from the block for the inlined
10367 function, if we're in an exception handler or some such; make
10368 sure that the abstract function has been written out.
10370 Doing this for nested functions is wrong, however; functions are
10371 distinct units, and our context might not even be inline. */
10375 fn = TYPE_STUB_DECL (fn);
10377 fn = decl_function_context (fn);
10379 dwarf2out_abstract_function (fn);
10382 if (DECL_P (origin))
10383 origin_die = lookup_decl_die (origin);
10384 else if (TYPE_P (origin))
10385 origin_die = lookup_type_die (origin);
10387 if (origin_die == NULL)
10390 add_AT_die_ref (die, DW_AT_abstract_origin, origin_die);
10393 /* We do not currently support the pure_virtual attribute. */
10396 add_pure_or_virtual_attribute (dw_die_ref die, tree func_decl)
10398 if (DECL_VINDEX (func_decl))
10400 add_AT_unsigned (die, DW_AT_virtuality, DW_VIRTUALITY_virtual);
10402 if (host_integerp (DECL_VINDEX (func_decl), 0))
10403 add_AT_loc (die, DW_AT_vtable_elem_location,
10404 new_loc_descr (DW_OP_constu,
10405 tree_low_cst (DECL_VINDEX (func_decl), 0),
10408 /* GNU extension: Record what type this method came from originally. */
10409 if (debug_info_level > DINFO_LEVEL_TERSE)
10410 add_AT_die_ref (die, DW_AT_containing_type,
10411 lookup_type_die (DECL_CONTEXT (func_decl)));
10415 /* Add source coordinate attributes for the given decl. */
10418 add_src_coords_attributes (dw_die_ref die, tree decl)
10420 unsigned file_index = lookup_filename (DECL_SOURCE_FILE (decl));
10422 add_AT_unsigned (die, DW_AT_decl_file, file_index);
10423 add_AT_unsigned (die, DW_AT_decl_line, DECL_SOURCE_LINE (decl));
10426 /* Add a DW_AT_name attribute and source coordinate attribute for the
10427 given decl, but only if it actually has a name. */
10430 add_name_and_src_coords_attributes (dw_die_ref die, tree decl)
10434 decl_name = DECL_NAME (decl);
10435 if (decl_name != NULL && IDENTIFIER_POINTER (decl_name) != NULL)
10437 add_name_attribute (die, dwarf2_name (decl, 0));
10438 if (! DECL_ARTIFICIAL (decl))
10439 add_src_coords_attributes (die, decl);
10441 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
10442 && TREE_PUBLIC (decl)
10443 && DECL_ASSEMBLER_NAME (decl) != DECL_NAME (decl)
10444 && !DECL_ABSTRACT (decl))
10445 add_AT_string (die, DW_AT_MIPS_linkage_name,
10446 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
10449 #ifdef VMS_DEBUGGING_INFO
10450 /* Get the function's name, as described by its RTL. This may be different
10451 from the DECL_NAME name used in the source file. */
10452 if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
10454 add_AT_addr (die, DW_AT_VMS_rtnbeg_pd_address,
10455 XEXP (DECL_RTL (decl), 0));
10456 VARRAY_PUSH_RTX (used_rtx_varray, XEXP (DECL_RTL (decl), 0));
10461 /* Push a new declaration scope. */
10464 push_decl_scope (tree scope)
10466 VARRAY_PUSH_TREE (decl_scope_table, scope);
10469 /* Pop a declaration scope. */
10472 pop_decl_scope (void)
10474 if (VARRAY_ACTIVE_SIZE (decl_scope_table) <= 0)
10477 VARRAY_POP (decl_scope_table);
10480 /* Return the DIE for the scope that immediately contains this type.
10481 Non-named types get global scope. Named types nested in other
10482 types get their containing scope if it's open, or global scope
10483 otherwise. All other types (i.e. function-local named types) get
10484 the current active scope. */
10487 scope_die_for (tree t, dw_die_ref context_die)
10489 dw_die_ref scope_die = NULL;
10490 tree containing_scope;
10493 /* Non-types always go in the current scope. */
10497 containing_scope = TYPE_CONTEXT (t);
10499 /* Use the containing namespace if it was passed in (for a declaration). */
10500 if (containing_scope && TREE_CODE (containing_scope) == NAMESPACE_DECL)
10502 if (context_die == lookup_decl_die (containing_scope))
10505 containing_scope = NULL_TREE;
10508 /* Ignore function type "scopes" from the C frontend. They mean that
10509 a tagged type is local to a parmlist of a function declarator, but
10510 that isn't useful to DWARF. */
10511 if (containing_scope && TREE_CODE (containing_scope) == FUNCTION_TYPE)
10512 containing_scope = NULL_TREE;
10514 if (containing_scope == NULL_TREE)
10515 scope_die = comp_unit_die;
10516 else if (TYPE_P (containing_scope))
10518 /* For types, we can just look up the appropriate DIE. But
10519 first we check to see if we're in the middle of emitting it
10520 so we know where the new DIE should go. */
10521 for (i = VARRAY_ACTIVE_SIZE (decl_scope_table) - 1; i >= 0; --i)
10522 if (VARRAY_TREE (decl_scope_table, i) == containing_scope)
10527 if (debug_info_level > DINFO_LEVEL_TERSE
10528 && !TREE_ASM_WRITTEN (containing_scope))
10531 /* If none of the current dies are suitable, we get file scope. */
10532 scope_die = comp_unit_die;
10535 scope_die = lookup_type_die (containing_scope);
10538 scope_die = context_die;
10543 /* Returns nonzero if CONTEXT_DIE is internal to a function. */
10546 local_scope_p (dw_die_ref context_die)
10548 for (; context_die; context_die = context_die->die_parent)
10549 if (context_die->die_tag == DW_TAG_inlined_subroutine
10550 || context_die->die_tag == DW_TAG_subprogram)
10556 /* Returns nonzero if CONTEXT_DIE is a class or namespace, for deciding
10557 whether or not to treat a DIE in this context as a declaration. */
10560 class_or_namespace_scope_p (dw_die_ref context_die)
10562 return (context_die
10563 && (context_die->die_tag == DW_TAG_structure_type
10564 || context_die->die_tag == DW_TAG_union_type
10565 || context_die->die_tag == DW_TAG_namespace));
10568 /* Many forms of DIEs require a "type description" attribute. This
10569 routine locates the proper "type descriptor" die for the type given
10570 by 'type', and adds a DW_AT_type attribute below the given die. */
10573 add_type_attribute (dw_die_ref object_die, tree type, int decl_const,
10574 int decl_volatile, dw_die_ref context_die)
10576 enum tree_code code = TREE_CODE (type);
10577 dw_die_ref type_die = NULL;
10579 /* ??? If this type is an unnamed subrange type of an integral or
10580 floating-point type, use the inner type. This is because we have no
10581 support for unnamed types in base_type_die. This can happen if this is
10582 an Ada subrange type. Correct solution is emit a subrange type die. */
10583 if ((code == INTEGER_TYPE || code == REAL_TYPE)
10584 && TREE_TYPE (type) != 0 && TYPE_NAME (type) == 0)
10585 type = TREE_TYPE (type), code = TREE_CODE (type);
10587 if (code == ERROR_MARK
10588 /* Handle a special case. For functions whose return type is void, we
10589 generate *no* type attribute. (Note that no object may have type
10590 `void', so this only applies to function return types). */
10591 || code == VOID_TYPE)
10594 type_die = modified_type_die (type,
10595 decl_const || TYPE_READONLY (type),
10596 decl_volatile || TYPE_VOLATILE (type),
10599 if (type_die != NULL)
10600 add_AT_die_ref (object_die, DW_AT_type, type_die);
10603 /* Given a tree pointer to a struct, class, union, or enum type node, return
10604 a pointer to the (string) tag name for the given type, or zero if the type
10605 was declared without a tag. */
10607 static const char *
10608 type_tag (tree type)
10610 const char *name = 0;
10612 if (TYPE_NAME (type) != 0)
10616 /* Find the IDENTIFIER_NODE for the type name. */
10617 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
10618 t = TYPE_NAME (type);
10620 /* The g++ front end makes the TYPE_NAME of *each* tagged type point to
10621 a TYPE_DECL node, regardless of whether or not a `typedef' was
10623 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
10624 && ! DECL_IGNORED_P (TYPE_NAME (type)))
10625 t = DECL_NAME (TYPE_NAME (type));
10627 /* Now get the name as a string, or invent one. */
10629 name = IDENTIFIER_POINTER (t);
10632 return (name == 0 || *name == '\0') ? 0 : name;
10635 /* Return the type associated with a data member, make a special check
10636 for bit field types. */
10639 member_declared_type (tree member)
10641 return (DECL_BIT_FIELD_TYPE (member)
10642 ? DECL_BIT_FIELD_TYPE (member) : TREE_TYPE (member));
10645 /* Get the decl's label, as described by its RTL. This may be different
10646 from the DECL_NAME name used in the source file. */
10649 static const char *
10650 decl_start_label (tree decl)
10653 const char *fnname;
10655 x = DECL_RTL (decl);
10656 if (GET_CODE (x) != MEM)
10660 if (GET_CODE (x) != SYMBOL_REF)
10663 fnname = XSTR (x, 0);
10668 /* These routines generate the internal representation of the DIE's for
10669 the compilation unit. Debugging information is collected by walking
10670 the declaration trees passed in from dwarf2out_decl(). */
10673 gen_array_type_die (tree type, dw_die_ref context_die)
10675 dw_die_ref scope_die = scope_die_for (type, context_die);
10676 dw_die_ref array_die;
10679 /* ??? The SGI dwarf reader fails for array of array of enum types unless
10680 the inner array type comes before the outer array type. Thus we must
10681 call gen_type_die before we call new_die. See below also. */
10682 #ifdef MIPS_DEBUGGING_INFO
10683 gen_type_die (TREE_TYPE (type), context_die);
10686 array_die = new_die (DW_TAG_array_type, scope_die, type);
10687 add_name_attribute (array_die, type_tag (type));
10688 equate_type_number_to_die (type, array_die);
10690 if (TREE_CODE (type) == VECTOR_TYPE)
10692 /* The frontend feeds us a representation for the vector as a struct
10693 containing an array. Pull out the array type. */
10694 type = TREE_TYPE (TYPE_FIELDS (TYPE_DEBUG_REPRESENTATION_TYPE (type)));
10695 add_AT_flag (array_die, DW_AT_GNU_vector, 1);
10699 /* We default the array ordering. SDB will probably do
10700 the right things even if DW_AT_ordering is not present. It's not even
10701 an issue until we start to get into multidimensional arrays anyway. If
10702 SDB is ever caught doing the Wrong Thing for multi-dimensional arrays,
10703 then we'll have to put the DW_AT_ordering attribute back in. (But if
10704 and when we find out that we need to put these in, we will only do so
10705 for multidimensional arrays. */
10706 add_AT_unsigned (array_die, DW_AT_ordering, DW_ORD_row_major);
10709 #ifdef MIPS_DEBUGGING_INFO
10710 /* The SGI compilers handle arrays of unknown bound by setting
10711 AT_declaration and not emitting any subrange DIEs. */
10712 if (! TYPE_DOMAIN (type))
10713 add_AT_flag (array_die, DW_AT_declaration, 1);
10716 add_subscript_info (array_die, type);
10718 /* Add representation of the type of the elements of this array type. */
10719 element_type = TREE_TYPE (type);
10721 /* ??? The SGI dwarf reader fails for multidimensional arrays with a
10722 const enum type. E.g. const enum machine_mode insn_operand_mode[2][10].
10723 We work around this by disabling this feature. See also
10724 add_subscript_info. */
10725 #ifndef MIPS_DEBUGGING_INFO
10726 while (TREE_CODE (element_type) == ARRAY_TYPE)
10727 element_type = TREE_TYPE (element_type);
10729 gen_type_die (element_type, context_die);
10732 add_type_attribute (array_die, element_type, 0, 0, context_die);
10736 gen_set_type_die (tree type, dw_die_ref context_die)
10738 dw_die_ref type_die
10739 = new_die (DW_TAG_set_type, scope_die_for (type, context_die), type);
10741 equate_type_number_to_die (type, type_die);
10742 add_type_attribute (type_die, TREE_TYPE (type), 0, 0, context_die);
10747 gen_entry_point_die (tree decl, dw_die_ref context_die)
10749 tree origin = decl_ultimate_origin (decl);
10750 dw_die_ref decl_die = new_die (DW_TAG_entry_point, context_die, decl);
10752 if (origin != NULL)
10753 add_abstract_origin_attribute (decl_die, origin);
10756 add_name_and_src_coords_attributes (decl_die, decl);
10757 add_type_attribute (decl_die, TREE_TYPE (TREE_TYPE (decl)),
10758 0, 0, context_die);
10761 if (DECL_ABSTRACT (decl))
10762 equate_decl_number_to_die (decl, decl_die);
10764 add_AT_lbl_id (decl_die, DW_AT_low_pc, decl_start_label (decl));
10768 /* Walk through the list of incomplete types again, trying once more to
10769 emit full debugging info for them. */
10772 retry_incomplete_types (void)
10776 for (i = VARRAY_ACTIVE_SIZE (incomplete_types) - 1; i >= 0; i--)
10777 gen_type_die (VARRAY_TREE (incomplete_types, i), comp_unit_die);
10780 /* Generate a DIE to represent an inlined instance of an enumeration type. */
10783 gen_inlined_enumeration_type_die (tree type, dw_die_ref context_die)
10785 dw_die_ref type_die = new_die (DW_TAG_enumeration_type, context_die, type);
10787 /* We do not check for TREE_ASM_WRITTEN (type) being set, as the type may
10788 be incomplete and such types are not marked. */
10789 add_abstract_origin_attribute (type_die, type);
10792 /* Generate a DIE to represent an inlined instance of a structure type. */
10795 gen_inlined_structure_type_die (tree type, dw_die_ref context_die)
10797 dw_die_ref type_die = new_die (DW_TAG_structure_type, context_die, type);
10799 /* We do not check for TREE_ASM_WRITTEN (type) being set, as the type may
10800 be incomplete and such types are not marked. */
10801 add_abstract_origin_attribute (type_die, type);
10804 /* Generate a DIE to represent an inlined instance of a union type. */
10807 gen_inlined_union_type_die (tree type, dw_die_ref context_die)
10809 dw_die_ref type_die = new_die (DW_TAG_union_type, context_die, type);
10811 /* We do not check for TREE_ASM_WRITTEN (type) being set, as the type may
10812 be incomplete and such types are not marked. */
10813 add_abstract_origin_attribute (type_die, type);
10816 /* Generate a DIE to represent an enumeration type. Note that these DIEs
10817 include all of the information about the enumeration values also. Each
10818 enumerated type name/value is listed as a child of the enumerated type
10822 gen_enumeration_type_die (tree type, dw_die_ref context_die)
10824 dw_die_ref type_die = lookup_type_die (type);
10826 if (type_die == NULL)
10828 type_die = new_die (DW_TAG_enumeration_type,
10829 scope_die_for (type, context_die), type);
10830 equate_type_number_to_die (type, type_die);
10831 add_name_attribute (type_die, type_tag (type));
10833 else if (! TYPE_SIZE (type))
10836 remove_AT (type_die, DW_AT_declaration);
10838 /* Handle a GNU C/C++ extension, i.e. incomplete enum types. If the
10839 given enum type is incomplete, do not generate the DW_AT_byte_size
10840 attribute or the DW_AT_element_list attribute. */
10841 if (TYPE_SIZE (type))
10845 TREE_ASM_WRITTEN (type) = 1;
10846 add_byte_size_attribute (type_die, type);
10847 if (TYPE_STUB_DECL (type) != NULL_TREE)
10848 add_src_coords_attributes (type_die, TYPE_STUB_DECL (type));
10850 /* If the first reference to this type was as the return type of an
10851 inline function, then it may not have a parent. Fix this now. */
10852 if (type_die->die_parent == NULL)
10853 add_child_die (scope_die_for (type, context_die), type_die);
10855 for (link = TYPE_FIELDS (type);
10856 link != NULL; link = TREE_CHAIN (link))
10858 dw_die_ref enum_die = new_die (DW_TAG_enumerator, type_die, link);
10859 tree value = TREE_VALUE (link);
10861 add_name_attribute (enum_die,
10862 IDENTIFIER_POINTER (TREE_PURPOSE (link)));
10864 if (host_integerp (value, TREE_UNSIGNED (TREE_TYPE (value))))
10865 /* DWARF2 does not provide a way of indicating whether or
10866 not enumeration constants are signed or unsigned. GDB
10867 always assumes the values are signed, so we output all
10868 values as if they were signed. That means that
10869 enumeration constants with very large unsigned values
10870 will appear to have negative values in the debugger. */
10871 add_AT_int (enum_die, DW_AT_const_value,
10872 tree_low_cst (value, tree_int_cst_sgn (value) > 0));
10876 add_AT_flag (type_die, DW_AT_declaration, 1);
10881 /* Generate a DIE to represent either a real live formal parameter decl or to
10882 represent just the type of some formal parameter position in some function
10885 Note that this routine is a bit unusual because its argument may be a
10886 ..._DECL node (i.e. either a PARM_DECL or perhaps a VAR_DECL which
10887 represents an inlining of some PARM_DECL) or else some sort of a ..._TYPE
10888 node. If it's the former then this function is being called to output a
10889 DIE to represent a formal parameter object (or some inlining thereof). If
10890 it's the latter, then this function is only being called to output a
10891 DW_TAG_formal_parameter DIE to stand as a placeholder for some formal
10892 argument type of some subprogram type. */
10895 gen_formal_parameter_die (tree node, dw_die_ref context_die)
10897 dw_die_ref parm_die
10898 = new_die (DW_TAG_formal_parameter, context_die, node);
10901 switch (TREE_CODE_CLASS (TREE_CODE (node)))
10904 origin = decl_ultimate_origin (node);
10905 if (origin != NULL)
10906 add_abstract_origin_attribute (parm_die, origin);
10909 add_name_and_src_coords_attributes (parm_die, node);
10910 add_type_attribute (parm_die, TREE_TYPE (node),
10911 TREE_READONLY (node),
10912 TREE_THIS_VOLATILE (node),
10914 if (DECL_ARTIFICIAL (node))
10915 add_AT_flag (parm_die, DW_AT_artificial, 1);
10918 equate_decl_number_to_die (node, parm_die);
10919 if (! DECL_ABSTRACT (node))
10920 add_location_or_const_value_attribute (parm_die, node, DW_AT_location);
10925 /* We were called with some kind of a ..._TYPE node. */
10926 add_type_attribute (parm_die, node, 0, 0, context_die);
10936 /* Generate a special type of DIE used as a stand-in for a trailing ellipsis
10937 at the end of an (ANSI prototyped) formal parameters list. */
10940 gen_unspecified_parameters_die (tree decl_or_type, dw_die_ref context_die)
10942 new_die (DW_TAG_unspecified_parameters, context_die, decl_or_type);
10945 /* Generate a list of nameless DW_TAG_formal_parameter DIEs (and perhaps a
10946 DW_TAG_unspecified_parameters DIE) to represent the types of the formal
10947 parameters as specified in some function type specification (except for
10948 those which appear as part of a function *definition*). */
10951 gen_formal_types_die (tree function_or_method_type, dw_die_ref context_die)
10954 tree formal_type = NULL;
10955 tree first_parm_type;
10958 if (TREE_CODE (function_or_method_type) == FUNCTION_DECL)
10960 arg = DECL_ARGUMENTS (function_or_method_type);
10961 function_or_method_type = TREE_TYPE (function_or_method_type);
10966 first_parm_type = TYPE_ARG_TYPES (function_or_method_type);
10968 /* Make our first pass over the list of formal parameter types and output a
10969 DW_TAG_formal_parameter DIE for each one. */
10970 for (link = first_parm_type; link; )
10972 dw_die_ref parm_die;
10974 formal_type = TREE_VALUE (link);
10975 if (formal_type == void_type_node)
10978 /* Output a (nameless) DIE to represent the formal parameter itself. */
10979 parm_die = gen_formal_parameter_die (formal_type, context_die);
10980 if ((TREE_CODE (function_or_method_type) == METHOD_TYPE
10981 && link == first_parm_type)
10982 || (arg && DECL_ARTIFICIAL (arg)))
10983 add_AT_flag (parm_die, DW_AT_artificial, 1);
10985 link = TREE_CHAIN (link);
10987 arg = TREE_CHAIN (arg);
10990 /* If this function type has an ellipsis, add a
10991 DW_TAG_unspecified_parameters DIE to the end of the parameter list. */
10992 if (formal_type != void_type_node)
10993 gen_unspecified_parameters_die (function_or_method_type, context_die);
10995 /* Make our second (and final) pass over the list of formal parameter types
10996 and output DIEs to represent those types (as necessary). */
10997 for (link = TYPE_ARG_TYPES (function_or_method_type);
10998 link && TREE_VALUE (link);
10999 link = TREE_CHAIN (link))
11000 gen_type_die (TREE_VALUE (link), context_die);
11003 /* We want to generate the DIE for TYPE so that we can generate the
11004 die for MEMBER, which has been defined; we will need to refer back
11005 to the member declaration nested within TYPE. If we're trying to
11006 generate minimal debug info for TYPE, processing TYPE won't do the
11007 trick; we need to attach the member declaration by hand. */
11010 gen_type_die_for_member (tree type, tree member, dw_die_ref context_die)
11012 gen_type_die (type, context_die);
11014 /* If we're trying to avoid duplicate debug info, we may not have
11015 emitted the member decl for this function. Emit it now. */
11016 if (TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (type))
11017 && ! lookup_decl_die (member))
11019 if (decl_ultimate_origin (member))
11022 push_decl_scope (type);
11023 if (TREE_CODE (member) == FUNCTION_DECL)
11024 gen_subprogram_die (member, lookup_type_die (type));
11026 gen_variable_die (member, lookup_type_die (type));
11032 /* Generate the DWARF2 info for the "abstract" instance of a function which we
11033 may later generate inlined and/or out-of-line instances of. */
11036 dwarf2out_abstract_function (tree decl)
11038 dw_die_ref old_die;
11041 int was_abstract = DECL_ABSTRACT (decl);
11043 /* Make sure we have the actual abstract inline, not a clone. */
11044 decl = DECL_ORIGIN (decl);
11046 old_die = lookup_decl_die (decl);
11047 if (old_die && get_AT (old_die, DW_AT_inline))
11048 /* We've already generated the abstract instance. */
11051 /* Be sure we've emitted the in-class declaration DIE (if any) first, so
11052 we don't get confused by DECL_ABSTRACT. */
11053 if (debug_info_level > DINFO_LEVEL_TERSE)
11055 context = decl_class_context (decl);
11057 gen_type_die_for_member
11058 (context, decl, decl_function_context (decl) ? NULL : comp_unit_die);
11061 /* Pretend we've just finished compiling this function. */
11062 save_fn = current_function_decl;
11063 current_function_decl = decl;
11065 set_decl_abstract_flags (decl, 1);
11066 dwarf2out_decl (decl);
11067 if (! was_abstract)
11068 set_decl_abstract_flags (decl, 0);
11070 current_function_decl = save_fn;
11073 /* Generate a DIE to represent a declared function (either file-scope or
11077 gen_subprogram_die (tree decl, dw_die_ref context_die)
11079 char label_id[MAX_ARTIFICIAL_LABEL_BYTES];
11080 tree origin = decl_ultimate_origin (decl);
11081 dw_die_ref subr_die;
11085 dw_die_ref old_die = lookup_decl_die (decl);
11086 int declaration = (current_function_decl != decl
11087 || class_or_namespace_scope_p (context_die));
11089 /* It is possible to have both DECL_ABSTRACT and DECLARATION be true if we
11090 started to generate the abstract instance of an inline, decided to output
11091 its containing class, and proceeded to emit the declaration of the inline
11092 from the member list for the class. If so, DECLARATION takes priority;
11093 we'll get back to the abstract instance when done with the class. */
11095 /* The class-scope declaration DIE must be the primary DIE. */
11096 if (origin && declaration && class_or_namespace_scope_p (context_die))
11103 if (origin != NULL)
11105 if (declaration && ! local_scope_p (context_die))
11108 /* Fixup die_parent for the abstract instance of a nested
11109 inline function. */
11110 if (old_die && old_die->die_parent == NULL)
11111 add_child_die (context_die, old_die);
11113 subr_die = new_die (DW_TAG_subprogram, context_die, decl);
11114 add_abstract_origin_attribute (subr_die, origin);
11118 unsigned file_index = lookup_filename (DECL_SOURCE_FILE (decl));
11120 if (!get_AT_flag (old_die, DW_AT_declaration)
11121 /* We can have a normal definition following an inline one in the
11122 case of redefinition of GNU C extern inlines.
11123 It seems reasonable to use AT_specification in this case. */
11124 && !get_AT (old_die, DW_AT_inline))
11126 /* ??? This can happen if there is a bug in the program, for
11127 instance, if it has duplicate function definitions. Ideally,
11128 we should detect this case and ignore it. For now, if we have
11129 already reported an error, any error at all, then assume that
11130 we got here because of an input error, not a dwarf2 bug. */
11136 /* If the definition comes from the same place as the declaration,
11137 maybe use the old DIE. We always want the DIE for this function
11138 that has the *_pc attributes to be under comp_unit_die so the
11139 debugger can find it. We also need to do this for abstract
11140 instances of inlines, since the spec requires the out-of-line copy
11141 to have the same parent. For local class methods, this doesn't
11142 apply; we just use the old DIE. */
11143 if ((old_die->die_parent == comp_unit_die || context_die == NULL)
11144 && (DECL_ARTIFICIAL (decl)
11145 || (get_AT_unsigned (old_die, DW_AT_decl_file) == file_index
11146 && (get_AT_unsigned (old_die, DW_AT_decl_line)
11147 == (unsigned) DECL_SOURCE_LINE (decl)))))
11149 subr_die = old_die;
11151 /* Clear out the declaration attribute and the formal parameters.
11152 Do not remove all children, because it is possible that this
11153 declaration die was forced using force_decl_die(). In such
11154 cases die that forced declaration die (e.g. TAG_imported_module)
11155 is one of the children that we do not want to remove. */
11156 remove_AT (subr_die, DW_AT_declaration);
11157 remove_child_TAG (subr_die, DW_TAG_formal_parameter);
11161 subr_die = new_die (DW_TAG_subprogram, context_die, decl);
11162 add_AT_specification (subr_die, old_die);
11163 if (get_AT_unsigned (old_die, DW_AT_decl_file) != file_index)
11164 add_AT_unsigned (subr_die, DW_AT_decl_file, file_index);
11165 if (get_AT_unsigned (old_die, DW_AT_decl_line)
11166 != (unsigned) DECL_SOURCE_LINE (decl))
11168 (subr_die, DW_AT_decl_line, DECL_SOURCE_LINE (decl));
11173 subr_die = new_die (DW_TAG_subprogram, context_die, decl);
11175 if (TREE_PUBLIC (decl))
11176 add_AT_flag (subr_die, DW_AT_external, 1);
11178 add_name_and_src_coords_attributes (subr_die, decl);
11179 if (debug_info_level > DINFO_LEVEL_TERSE)
11181 add_prototyped_attribute (subr_die, TREE_TYPE (decl));
11182 add_type_attribute (subr_die, TREE_TYPE (TREE_TYPE (decl)),
11183 0, 0, context_die);
11186 add_pure_or_virtual_attribute (subr_die, decl);
11187 if (DECL_ARTIFICIAL (decl))
11188 add_AT_flag (subr_die, DW_AT_artificial, 1);
11190 if (TREE_PROTECTED (decl))
11191 add_AT_unsigned (subr_die, DW_AT_accessibility, DW_ACCESS_protected);
11192 else if (TREE_PRIVATE (decl))
11193 add_AT_unsigned (subr_die, DW_AT_accessibility, DW_ACCESS_private);
11198 if (!old_die || !get_AT (old_die, DW_AT_inline))
11200 add_AT_flag (subr_die, DW_AT_declaration, 1);
11202 /* The first time we see a member function, it is in the context of
11203 the class to which it belongs. We make sure of this by emitting
11204 the class first. The next time is the definition, which is
11205 handled above. The two may come from the same source text.
11207 Note that force_decl_die() forces function declaration die. It is
11208 later reused to represent definition. */
11209 equate_decl_number_to_die (decl, subr_die);
11212 else if (DECL_ABSTRACT (decl))
11214 if (DECL_DECLARED_INLINE_P (decl))
11216 if (cgraph_function_possibly_inlined_p (decl))
11217 add_AT_unsigned (subr_die, DW_AT_inline, DW_INL_declared_inlined);
11219 add_AT_unsigned (subr_die, DW_AT_inline, DW_INL_declared_not_inlined);
11223 if (cgraph_function_possibly_inlined_p (decl))
11224 add_AT_unsigned (subr_die, DW_AT_inline, DW_INL_inlined);
11226 add_AT_unsigned (subr_die, DW_AT_inline, DW_INL_not_inlined);
11229 equate_decl_number_to_die (decl, subr_die);
11231 else if (!DECL_EXTERNAL (decl))
11233 if (!old_die || !get_AT (old_die, DW_AT_inline))
11234 equate_decl_number_to_die (decl, subr_die);
11236 ASM_GENERATE_INTERNAL_LABEL (label_id, FUNC_BEGIN_LABEL,
11237 current_function_funcdef_no);
11238 add_AT_lbl_id (subr_die, DW_AT_low_pc, label_id);
11239 ASM_GENERATE_INTERNAL_LABEL (label_id, FUNC_END_LABEL,
11240 current_function_funcdef_no);
11241 add_AT_lbl_id (subr_die, DW_AT_high_pc, label_id);
11243 add_pubname (decl, subr_die);
11244 add_arange (decl, subr_die);
11246 #ifdef MIPS_DEBUGGING_INFO
11247 /* Add a reference to the FDE for this routine. */
11248 add_AT_fde_ref (subr_die, DW_AT_MIPS_fde, current_funcdef_fde);
11251 /* Define the "frame base" location for this routine. We use the
11252 frame pointer or stack pointer registers, since the RTL for local
11253 variables is relative to one of them. */
11254 if (frame_base_decl && lookup_decl_loc (frame_base_decl) != NULL)
11256 add_location_or_const_value_attribute (subr_die, frame_base_decl,
11262 = frame_pointer_needed ? hard_frame_pointer_rtx : stack_pointer_rtx;
11263 add_AT_loc (subr_die, DW_AT_frame_base, reg_loc_descriptor (fp_reg));
11267 /* ??? This fails for nested inline functions, because context_display
11268 is not part of the state saved/restored for inline functions. */
11269 if (current_function_needs_context)
11270 add_AT_location_description (subr_die, DW_AT_static_link,
11271 loc_descriptor (lookup_static_chain (decl)));
11275 /* Now output descriptions of the arguments for this function. This gets
11276 (unnecessarily?) complex because of the fact that the DECL_ARGUMENT list
11277 for a FUNCTION_DECL doesn't indicate cases where there was a trailing
11278 `...' at the end of the formal parameter list. In order to find out if
11279 there was a trailing ellipsis or not, we must instead look at the type
11280 associated with the FUNCTION_DECL. This will be a node of type
11281 FUNCTION_TYPE. If the chain of type nodes hanging off of this
11282 FUNCTION_TYPE node ends with a void_type_node then there should *not* be
11283 an ellipsis at the end. */
11285 /* In the case where we are describing a mere function declaration, all we
11286 need to do here (and all we *can* do here) is to describe the *types* of
11287 its formal parameters. */
11288 if (debug_info_level <= DINFO_LEVEL_TERSE)
11290 else if (declaration)
11291 gen_formal_types_die (decl, subr_die);
11294 /* Generate DIEs to represent all known formal parameters. */
11295 tree arg_decls = DECL_ARGUMENTS (decl);
11298 /* When generating DIEs, generate the unspecified_parameters DIE
11299 instead if we come across the arg "__builtin_va_alist" */
11300 for (parm = arg_decls; parm; parm = TREE_CHAIN (parm))
11301 if (TREE_CODE (parm) == PARM_DECL)
11303 if (DECL_NAME (parm)
11304 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)),
11305 "__builtin_va_alist"))
11306 gen_unspecified_parameters_die (parm, subr_die);
11308 gen_decl_die (parm, subr_die);
11311 /* Decide whether we need an unspecified_parameters DIE at the end.
11312 There are 2 more cases to do this for: 1) the ansi ... declaration -
11313 this is detectable when the end of the arg list is not a
11314 void_type_node 2) an unprototyped function declaration (not a
11315 definition). This just means that we have no info about the
11316 parameters at all. */
11317 fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
11318 if (fn_arg_types != NULL)
11320 /* This is the prototyped case, check for.... */
11321 if (TREE_VALUE (tree_last (fn_arg_types)) != void_type_node)
11322 gen_unspecified_parameters_die (decl, subr_die);
11324 else if (DECL_INITIAL (decl) == NULL_TREE)
11325 gen_unspecified_parameters_die (decl, subr_die);
11328 /* Output Dwarf info for all of the stuff within the body of the function
11329 (if it has one - it may be just a declaration). */
11330 outer_scope = DECL_INITIAL (decl);
11332 /* OUTER_SCOPE is a pointer to the outermost BLOCK node created to represent
11333 a function. This BLOCK actually represents the outermost binding contour
11334 for the function, i.e. the contour in which the function's formal
11335 parameters and labels get declared. Curiously, it appears that the front
11336 end doesn't actually put the PARM_DECL nodes for the current function onto
11337 the BLOCK_VARS list for this outer scope, but are strung off of the
11338 DECL_ARGUMENTS list for the function instead.
11340 The BLOCK_VARS list for the `outer_scope' does provide us with a list of
11341 the LABEL_DECL nodes for the function however, and we output DWARF info
11342 for those in decls_for_scope. Just within the `outer_scope' there will be
11343 a BLOCK node representing the function's outermost pair of curly braces,
11344 and any blocks used for the base and member initializers of a C++
11345 constructor function. */
11346 if (! declaration && TREE_CODE (outer_scope) != ERROR_MARK)
11348 current_function_has_inlines = 0;
11349 decls_for_scope (outer_scope, subr_die, 0);
11351 #if 0 && defined (MIPS_DEBUGGING_INFO)
11352 if (current_function_has_inlines)
11354 add_AT_flag (subr_die, DW_AT_MIPS_has_inlines, 1);
11355 if (! comp_unit_has_inlines)
11357 add_AT_flag (comp_unit_die, DW_AT_MIPS_has_inlines, 1);
11358 comp_unit_has_inlines = 1;
11365 /* Generate a DIE to represent a declared data object. */
11368 gen_variable_die (tree decl, dw_die_ref context_die)
11370 tree origin = decl_ultimate_origin (decl);
11371 dw_die_ref var_die = new_die (DW_TAG_variable, context_die, decl);
11373 dw_die_ref old_die = lookup_decl_die (decl);
11374 int declaration = (DECL_EXTERNAL (decl)
11375 || class_or_namespace_scope_p (context_die));
11377 if (origin != NULL)
11378 add_abstract_origin_attribute (var_die, origin);
11380 /* Loop unrolling can create multiple blocks that refer to the same
11381 static variable, so we must test for the DW_AT_declaration flag.
11383 ??? Loop unrolling/reorder_blocks should perhaps be rewritten to
11384 copy decls and set the DECL_ABSTRACT flag on them instead of
11387 ??? Duplicated blocks have been rewritten to use .debug_ranges. */
11388 else if (old_die && TREE_STATIC (decl)
11389 && get_AT_flag (old_die, DW_AT_declaration) == 1)
11391 /* This is a definition of a C++ class level static. */
11392 add_AT_specification (var_die, old_die);
11393 if (DECL_NAME (decl))
11395 unsigned file_index = lookup_filename (DECL_SOURCE_FILE (decl));
11397 if (get_AT_unsigned (old_die, DW_AT_decl_file) != file_index)
11398 add_AT_unsigned (var_die, DW_AT_decl_file, file_index);
11400 if (get_AT_unsigned (old_die, DW_AT_decl_line)
11401 != (unsigned) DECL_SOURCE_LINE (decl))
11403 add_AT_unsigned (var_die, DW_AT_decl_line,
11404 DECL_SOURCE_LINE (decl));
11409 add_name_and_src_coords_attributes (var_die, decl);
11410 add_type_attribute (var_die, TREE_TYPE (decl), TREE_READONLY (decl),
11411 TREE_THIS_VOLATILE (decl), context_die);
11413 if (TREE_PUBLIC (decl))
11414 add_AT_flag (var_die, DW_AT_external, 1);
11416 if (DECL_ARTIFICIAL (decl))
11417 add_AT_flag (var_die, DW_AT_artificial, 1);
11419 if (TREE_PROTECTED (decl))
11420 add_AT_unsigned (var_die, DW_AT_accessibility, DW_ACCESS_protected);
11421 else if (TREE_PRIVATE (decl))
11422 add_AT_unsigned (var_die, DW_AT_accessibility, DW_ACCESS_private);
11426 add_AT_flag (var_die, DW_AT_declaration, 1);
11428 if (DECL_ABSTRACT (decl) || declaration)
11429 equate_decl_number_to_die (decl, var_die);
11431 if (! declaration && ! DECL_ABSTRACT (decl))
11433 add_location_or_const_value_attribute (var_die, decl, DW_AT_location);
11434 add_pubname (decl, var_die);
11437 tree_add_const_value_attribute (var_die, decl);
11440 /* Generate a DIE to represent a label identifier. */
11443 gen_label_die (tree decl, dw_die_ref context_die)
11445 tree origin = decl_ultimate_origin (decl);
11446 dw_die_ref lbl_die = new_die (DW_TAG_label, context_die, decl);
11448 char label[MAX_ARTIFICIAL_LABEL_BYTES];
11450 if (origin != NULL)
11451 add_abstract_origin_attribute (lbl_die, origin);
11453 add_name_and_src_coords_attributes (lbl_die, decl);
11455 if (DECL_ABSTRACT (decl))
11456 equate_decl_number_to_die (decl, lbl_die);
11459 insn = DECL_RTL_IF_SET (decl);
11461 /* Deleted labels are programmer specified labels which have been
11462 eliminated because of various optimizations. We still emit them
11463 here so that it is possible to put breakpoints on them. */
11465 && (GET_CODE (insn) == CODE_LABEL
11466 || ((GET_CODE (insn) == NOTE
11467 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL))))
11469 /* When optimization is enabled (via -O) some parts of the compiler
11470 (e.g. jump.c and cse.c) may try to delete CODE_LABEL insns which
11471 represent source-level labels which were explicitly declared by
11472 the user. This really shouldn't be happening though, so catch
11473 it if it ever does happen. */
11474 if (INSN_DELETED_P (insn))
11477 ASM_GENERATE_INTERNAL_LABEL (label, "L", CODE_LABEL_NUMBER (insn));
11478 add_AT_lbl_id (lbl_die, DW_AT_low_pc, label);
11483 /* Generate a DIE for a lexical block. */
11486 gen_lexical_block_die (tree stmt, dw_die_ref context_die, int depth)
11488 dw_die_ref stmt_die = new_die (DW_TAG_lexical_block, context_die, stmt);
11489 char label[MAX_ARTIFICIAL_LABEL_BYTES];
11491 if (! BLOCK_ABSTRACT (stmt))
11493 if (BLOCK_FRAGMENT_CHAIN (stmt))
11497 add_AT_range_list (stmt_die, DW_AT_ranges, add_ranges (stmt));
11499 chain = BLOCK_FRAGMENT_CHAIN (stmt);
11502 add_ranges (chain);
11503 chain = BLOCK_FRAGMENT_CHAIN (chain);
11510 ASM_GENERATE_INTERNAL_LABEL (label, BLOCK_BEGIN_LABEL,
11511 BLOCK_NUMBER (stmt));
11512 add_AT_lbl_id (stmt_die, DW_AT_low_pc, label);
11513 ASM_GENERATE_INTERNAL_LABEL (label, BLOCK_END_LABEL,
11514 BLOCK_NUMBER (stmt));
11515 add_AT_lbl_id (stmt_die, DW_AT_high_pc, label);
11519 decls_for_scope (stmt, stmt_die, depth);
11522 /* Generate a DIE for an inlined subprogram. */
11525 gen_inlined_subroutine_die (tree stmt, dw_die_ref context_die, int depth)
11527 tree decl = block_ultimate_origin (stmt);
11529 /* Emit info for the abstract instance first, if we haven't yet. We
11530 must emit this even if the block is abstract, otherwise when we
11531 emit the block below (or elsewhere), we may end up trying to emit
11532 a die whose origin die hasn't been emitted, and crashing. */
11533 dwarf2out_abstract_function (decl);
11535 if (! BLOCK_ABSTRACT (stmt))
11537 dw_die_ref subr_die
11538 = new_die (DW_TAG_inlined_subroutine, context_die, stmt);
11539 char label[MAX_ARTIFICIAL_LABEL_BYTES];
11541 add_abstract_origin_attribute (subr_die, decl);
11542 ASM_GENERATE_INTERNAL_LABEL (label, BLOCK_BEGIN_LABEL,
11543 BLOCK_NUMBER (stmt));
11544 add_AT_lbl_id (subr_die, DW_AT_low_pc, label);
11545 ASM_GENERATE_INTERNAL_LABEL (label, BLOCK_END_LABEL,
11546 BLOCK_NUMBER (stmt));
11547 add_AT_lbl_id (subr_die, DW_AT_high_pc, label);
11548 decls_for_scope (stmt, subr_die, depth);
11549 current_function_has_inlines = 1;
11552 /* We may get here if we're the outer block of function A that was
11553 inlined into function B that was inlined into function C. When
11554 generating debugging info for C, dwarf2out_abstract_function(B)
11555 would mark all inlined blocks as abstract, including this one.
11556 So, we wouldn't (and shouldn't) expect labels to be generated
11557 for this one. Instead, just emit debugging info for
11558 declarations within the block. This is particularly important
11559 in the case of initializers of arguments passed from B to us:
11560 if they're statement expressions containing declarations, we
11561 wouldn't generate dies for their abstract variables, and then,
11562 when generating dies for the real variables, we'd die (pun
11564 gen_lexical_block_die (stmt, context_die, depth);
11567 /* Generate a DIE for a field in a record, or structure. */
11570 gen_field_die (tree decl, dw_die_ref context_die)
11572 dw_die_ref decl_die;
11574 if (TREE_TYPE (decl) == error_mark_node)
11577 decl_die = new_die (DW_TAG_member, context_die, decl);
11578 add_name_and_src_coords_attributes (decl_die, decl);
11579 add_type_attribute (decl_die, member_declared_type (decl),
11580 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl),
11583 if (DECL_BIT_FIELD_TYPE (decl))
11585 add_byte_size_attribute (decl_die, decl);
11586 add_bit_size_attribute (decl_die, decl);
11587 add_bit_offset_attribute (decl_die, decl);
11590 if (TREE_CODE (DECL_FIELD_CONTEXT (decl)) != UNION_TYPE)
11591 add_data_member_location_attribute (decl_die, decl);
11593 if (DECL_ARTIFICIAL (decl))
11594 add_AT_flag (decl_die, DW_AT_artificial, 1);
11596 if (TREE_PROTECTED (decl))
11597 add_AT_unsigned (decl_die, DW_AT_accessibility, DW_ACCESS_protected);
11598 else if (TREE_PRIVATE (decl))
11599 add_AT_unsigned (decl_die, DW_AT_accessibility, DW_ACCESS_private);
11603 /* Don't generate either pointer_type DIEs or reference_type DIEs here.
11604 Use modified_type_die instead.
11605 We keep this code here just in case these types of DIEs may be needed to
11606 represent certain things in other languages (e.g. Pascal) someday. */
11609 gen_pointer_type_die (tree type, dw_die_ref context_die)
11612 = new_die (DW_TAG_pointer_type, scope_die_for (type, context_die), type);
11614 equate_type_number_to_die (type, ptr_die);
11615 add_type_attribute (ptr_die, TREE_TYPE (type), 0, 0, context_die);
11616 add_AT_unsigned (mod_type_die, DW_AT_byte_size, PTR_SIZE);
11619 /* Don't generate either pointer_type DIEs or reference_type DIEs here.
11620 Use modified_type_die instead.
11621 We keep this code here just in case these types of DIEs may be needed to
11622 represent certain things in other languages (e.g. Pascal) someday. */
11625 gen_reference_type_die (tree type, dw_die_ref context_die)
11628 = new_die (DW_TAG_reference_type, scope_die_for (type, context_die), type);
11630 equate_type_number_to_die (type, ref_die);
11631 add_type_attribute (ref_die, TREE_TYPE (type), 0, 0, context_die);
11632 add_AT_unsigned (mod_type_die, DW_AT_byte_size, PTR_SIZE);
11636 /* Generate a DIE for a pointer to a member type. */
11639 gen_ptr_to_mbr_type_die (tree type, dw_die_ref context_die)
11642 = new_die (DW_TAG_ptr_to_member_type,
11643 scope_die_for (type, context_die), type);
11645 equate_type_number_to_die (type, ptr_die);
11646 add_AT_die_ref (ptr_die, DW_AT_containing_type,
11647 lookup_type_die (TYPE_OFFSET_BASETYPE (type)));
11648 add_type_attribute (ptr_die, TREE_TYPE (type), 0, 0, context_die);
11651 /* Generate the DIE for the compilation unit. */
11654 gen_compile_unit_die (const char *filename)
11657 char producer[250];
11658 const char *language_string = lang_hooks.name;
11661 die = new_die (DW_TAG_compile_unit, NULL, NULL);
11665 add_name_attribute (die, filename);
11666 /* Don't add cwd for <built-in>. */
11667 if (filename[0] != DIR_SEPARATOR && filename[0] != '<')
11668 add_comp_dir_attribute (die);
11671 sprintf (producer, "%s %s", language_string, version_string);
11673 #ifdef MIPS_DEBUGGING_INFO
11674 /* The MIPS/SGI compilers place the 'cc' command line options in the producer
11675 string. The SGI debugger looks for -g, -g1, -g2, or -g3; if they do
11676 not appear in the producer string, the debugger reaches the conclusion
11677 that the object file is stripped and has no debugging information.
11678 To get the MIPS/SGI debugger to believe that there is debugging
11679 information in the object file, we add a -g to the producer string. */
11680 if (debug_info_level > DINFO_LEVEL_TERSE)
11681 strcat (producer, " -g");
11684 add_AT_string (die, DW_AT_producer, producer);
11686 if (strcmp (language_string, "GNU C++") == 0)
11687 language = DW_LANG_C_plus_plus;
11688 else if (strcmp (language_string, "GNU Ada") == 0)
11689 language = DW_LANG_Ada95;
11690 else if (strcmp (language_string, "GNU F77") == 0)
11691 language = DW_LANG_Fortran77;
11692 else if (strcmp (language_string, "GNU Pascal") == 0)
11693 language = DW_LANG_Pascal83;
11694 else if (strcmp (language_string, "GNU Java") == 0)
11695 language = DW_LANG_Java;
11697 language = DW_LANG_C89;
11699 add_AT_unsigned (die, DW_AT_language, language);
11703 /* Generate a DIE for a string type. */
11706 gen_string_type_die (tree type, dw_die_ref context_die)
11708 dw_die_ref type_die
11709 = new_die (DW_TAG_string_type, scope_die_for (type, context_die), type);
11711 equate_type_number_to_die (type, type_die);
11713 /* ??? Fudge the string length attribute for now.
11714 TODO: add string length info. */
11716 string_length_attribute (TYPE_MAX_VALUE (TYPE_DOMAIN (type)));
11717 bound_representation (upper_bound, 0, 'u');
11721 /* Generate the DIE for a base class. */
11724 gen_inheritance_die (tree binfo, tree access, dw_die_ref context_die)
11726 dw_die_ref die = new_die (DW_TAG_inheritance, context_die, binfo);
11728 add_type_attribute (die, BINFO_TYPE (binfo), 0, 0, context_die);
11729 add_data_member_location_attribute (die, binfo);
11731 if (TREE_VIA_VIRTUAL (binfo))
11732 add_AT_unsigned (die, DW_AT_virtuality, DW_VIRTUALITY_virtual);
11734 if (access == access_public_node)
11735 add_AT_unsigned (die, DW_AT_accessibility, DW_ACCESS_public);
11736 else if (access == access_protected_node)
11737 add_AT_unsigned (die, DW_AT_accessibility, DW_ACCESS_protected);
11740 /* Generate a DIE for a class member. */
11743 gen_member_die (tree type, dw_die_ref context_die)
11746 tree binfo = TYPE_BINFO (type);
11749 /* If this is not an incomplete type, output descriptions of each of its
11750 members. Note that as we output the DIEs necessary to represent the
11751 members of this record or union type, we will also be trying to output
11752 DIEs to represent the *types* of those members. However the `type'
11753 function (above) will specifically avoid generating type DIEs for member
11754 types *within* the list of member DIEs for this (containing) type except
11755 for those types (of members) which are explicitly marked as also being
11756 members of this (containing) type themselves. The g++ front- end can
11757 force any given type to be treated as a member of some other (containing)
11758 type by setting the TYPE_CONTEXT of the given (member) type to point to
11759 the TREE node representing the appropriate (containing) type. */
11761 /* First output info about the base classes. */
11762 if (binfo && BINFO_BASETYPES (binfo))
11764 tree bases = BINFO_BASETYPES (binfo);
11765 tree accesses = BINFO_BASEACCESSES (binfo);
11766 int n_bases = TREE_VEC_LENGTH (bases);
11769 for (i = 0; i < n_bases; i++)
11770 gen_inheritance_die (TREE_VEC_ELT (bases, i),
11771 (accesses ? TREE_VEC_ELT (accesses, i)
11772 : access_public_node), context_die);
11775 /* Now output info about the data members and type members. */
11776 for (member = TYPE_FIELDS (type); member; member = TREE_CHAIN (member))
11778 /* If we thought we were generating minimal debug info for TYPE
11779 and then changed our minds, some of the member declarations
11780 may have already been defined. Don't define them again, but
11781 do put them in the right order. */
11783 child = lookup_decl_die (member);
11785 splice_child_die (context_die, child);
11787 gen_decl_die (member, context_die);
11790 /* Now output info about the function members (if any). */
11791 for (member = TYPE_METHODS (type); member; member = TREE_CHAIN (member))
11793 /* Don't include clones in the member list. */
11794 if (DECL_ABSTRACT_ORIGIN (member))
11797 child = lookup_decl_die (member);
11799 splice_child_die (context_die, child);
11801 gen_decl_die (member, context_die);
11805 /* Generate a DIE for a structure or union type. If TYPE_DECL_SUPPRESS_DEBUG
11806 is set, we pretend that the type was never defined, so we only get the
11807 member DIEs needed by later specification DIEs. */
11810 gen_struct_or_union_type_die (tree type, dw_die_ref context_die)
11812 dw_die_ref type_die = lookup_type_die (type);
11813 dw_die_ref scope_die = 0;
11815 int complete = (TYPE_SIZE (type)
11816 && (! TYPE_STUB_DECL (type)
11817 || ! TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (type))));
11818 int ns_decl = (context_die && context_die->die_tag == DW_TAG_namespace);
11820 if (type_die && ! complete)
11823 if (TYPE_CONTEXT (type) != NULL_TREE
11824 && (AGGREGATE_TYPE_P (TYPE_CONTEXT (type))
11825 || TREE_CODE (TYPE_CONTEXT (type)) == NAMESPACE_DECL))
11828 scope_die = scope_die_for (type, context_die);
11830 if (! type_die || (nested && scope_die == comp_unit_die))
11831 /* First occurrence of type or toplevel definition of nested class. */
11833 dw_die_ref old_die = type_die;
11835 type_die = new_die (TREE_CODE (type) == RECORD_TYPE
11836 ? DW_TAG_structure_type : DW_TAG_union_type,
11838 equate_type_number_to_die (type, type_die);
11840 add_AT_specification (type_die, old_die);
11842 add_name_attribute (type_die, type_tag (type));
11845 remove_AT (type_die, DW_AT_declaration);
11847 /* If this type has been completed, then give it a byte_size attribute and
11848 then give a list of members. */
11849 if (complete && !ns_decl)
11851 /* Prevent infinite recursion in cases where the type of some member of
11852 this type is expressed in terms of this type itself. */
11853 TREE_ASM_WRITTEN (type) = 1;
11854 add_byte_size_attribute (type_die, type);
11855 if (TYPE_STUB_DECL (type) != NULL_TREE)
11856 add_src_coords_attributes (type_die, TYPE_STUB_DECL (type));
11858 /* If the first reference to this type was as the return type of an
11859 inline function, then it may not have a parent. Fix this now. */
11860 if (type_die->die_parent == NULL)
11861 add_child_die (scope_die, type_die);
11863 push_decl_scope (type);
11864 gen_member_die (type, type_die);
11867 /* GNU extension: Record what type our vtable lives in. */
11868 if (TYPE_VFIELD (type))
11870 tree vtype = DECL_FCONTEXT (TYPE_VFIELD (type));
11872 gen_type_die (vtype, context_die);
11873 add_AT_die_ref (type_die, DW_AT_containing_type,
11874 lookup_type_die (vtype));
11879 add_AT_flag (type_die, DW_AT_declaration, 1);
11881 /* We don't need to do this for function-local types. */
11882 if (TYPE_STUB_DECL (type)
11883 && ! decl_function_context (TYPE_STUB_DECL (type)))
11884 VARRAY_PUSH_TREE (incomplete_types, type);
11888 /* Generate a DIE for a subroutine _type_. */
11891 gen_subroutine_type_die (tree type, dw_die_ref context_die)
11893 tree return_type = TREE_TYPE (type);
11894 dw_die_ref subr_die
11895 = new_die (DW_TAG_subroutine_type,
11896 scope_die_for (type, context_die), type);
11898 equate_type_number_to_die (type, subr_die);
11899 add_prototyped_attribute (subr_die, type);
11900 add_type_attribute (subr_die, return_type, 0, 0, context_die);
11901 gen_formal_types_die (type, subr_die);
11904 /* Generate a DIE for a type definition. */
11907 gen_typedef_die (tree decl, dw_die_ref context_die)
11909 dw_die_ref type_die;
11912 if (TREE_ASM_WRITTEN (decl))
11915 TREE_ASM_WRITTEN (decl) = 1;
11916 type_die = new_die (DW_TAG_typedef, context_die, decl);
11917 origin = decl_ultimate_origin (decl);
11918 if (origin != NULL)
11919 add_abstract_origin_attribute (type_die, origin);
11924 add_name_and_src_coords_attributes (type_die, decl);
11925 if (DECL_ORIGINAL_TYPE (decl))
11927 type = DECL_ORIGINAL_TYPE (decl);
11929 if (type == TREE_TYPE (decl))
11932 equate_type_number_to_die (TREE_TYPE (decl), type_die);
11935 type = TREE_TYPE (decl);
11937 add_type_attribute (type_die, type, TREE_READONLY (decl),
11938 TREE_THIS_VOLATILE (decl), context_die);
11941 if (DECL_ABSTRACT (decl))
11942 equate_decl_number_to_die (decl, type_die);
11945 /* Generate a type description DIE. */
11948 gen_type_die (tree type, dw_die_ref context_die)
11952 if (type == NULL_TREE || type == error_mark_node)
11955 if (TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
11956 && DECL_ORIGINAL_TYPE (TYPE_NAME (type)))
11958 if (TREE_ASM_WRITTEN (type))
11961 /* Prevent broken recursion; we can't hand off to the same type. */
11962 if (DECL_ORIGINAL_TYPE (TYPE_NAME (type)) == type)
11965 TREE_ASM_WRITTEN (type) = 1;
11966 gen_decl_die (TYPE_NAME (type), context_die);
11970 /* We are going to output a DIE to represent the unqualified version
11971 of this type (i.e. without any const or volatile qualifiers) so
11972 get the main variant (i.e. the unqualified version) of this type
11973 now. (Vectors are special because the debugging info is in the
11974 cloned type itself). */
11975 if (TREE_CODE (type) != VECTOR_TYPE)
11976 type = type_main_variant (type);
11978 if (TREE_ASM_WRITTEN (type))
11981 switch (TREE_CODE (type))
11987 case REFERENCE_TYPE:
11988 /* We must set TREE_ASM_WRITTEN in case this is a recursive type. This
11989 ensures that the gen_type_die recursion will terminate even if the
11990 type is recursive. Recursive types are possible in Ada. */
11991 /* ??? We could perhaps do this for all types before the switch
11993 TREE_ASM_WRITTEN (type) = 1;
11995 /* For these types, all that is required is that we output a DIE (or a
11996 set of DIEs) to represent the "basis" type. */
11997 gen_type_die (TREE_TYPE (type), context_die);
12001 /* This code is used for C++ pointer-to-data-member types.
12002 Output a description of the relevant class type. */
12003 gen_type_die (TYPE_OFFSET_BASETYPE (type), context_die);
12005 /* Output a description of the type of the object pointed to. */
12006 gen_type_die (TREE_TYPE (type), context_die);
12008 /* Now output a DIE to represent this pointer-to-data-member type
12010 gen_ptr_to_mbr_type_die (type, context_die);
12014 gen_type_die (TYPE_DOMAIN (type), context_die);
12015 gen_set_type_die (type, context_die);
12019 gen_type_die (TREE_TYPE (type), context_die);
12020 abort (); /* No way to represent these in Dwarf yet! */
12023 case FUNCTION_TYPE:
12024 /* Force out return type (in case it wasn't forced out already). */
12025 gen_type_die (TREE_TYPE (type), context_die);
12026 gen_subroutine_type_die (type, context_die);
12030 /* Force out return type (in case it wasn't forced out already). */
12031 gen_type_die (TREE_TYPE (type), context_die);
12032 gen_subroutine_type_die (type, context_die);
12036 if (TYPE_STRING_FLAG (type) && TREE_CODE (TREE_TYPE (type)) == CHAR_TYPE)
12038 gen_type_die (TREE_TYPE (type), context_die);
12039 gen_string_type_die (type, context_die);
12042 gen_array_type_die (type, context_die);
12046 gen_array_type_die (type, context_die);
12049 case ENUMERAL_TYPE:
12052 case QUAL_UNION_TYPE:
12053 /* If this is a nested type whose containing class hasn't been written
12054 out yet, writing it out will cover this one, too. This does not apply
12055 to instantiations of member class templates; they need to be added to
12056 the containing class as they are generated. FIXME: This hurts the
12057 idea of combining type decls from multiple TUs, since we can't predict
12058 what set of template instantiations we'll get. */
12059 if (TYPE_CONTEXT (type)
12060 && AGGREGATE_TYPE_P (TYPE_CONTEXT (type))
12061 && ! TREE_ASM_WRITTEN (TYPE_CONTEXT (type)))
12063 gen_type_die (TYPE_CONTEXT (type), context_die);
12065 if (TREE_ASM_WRITTEN (type))
12068 /* If that failed, attach ourselves to the stub. */
12069 push_decl_scope (TYPE_CONTEXT (type));
12070 context_die = lookup_type_die (TYPE_CONTEXT (type));
12075 declare_in_namespace (type, context_die);
12079 if (TREE_CODE (type) == ENUMERAL_TYPE)
12080 gen_enumeration_type_die (type, context_die);
12082 gen_struct_or_union_type_die (type, context_die);
12087 /* Don't set TREE_ASM_WRITTEN on an incomplete struct; we want to fix
12088 it up if it is ever completed. gen_*_type_die will set it for us
12089 when appropriate. */
12098 /* No DIEs needed for fundamental types. */
12102 /* No Dwarf representation currently defined. */
12109 TREE_ASM_WRITTEN (type) = 1;
12112 /* Generate a DIE for a tagged type instantiation. */
12115 gen_tagged_type_instantiation_die (tree type, dw_die_ref context_die)
12117 if (type == NULL_TREE || type == error_mark_node)
12120 /* We are going to output a DIE to represent the unqualified version of
12121 this type (i.e. without any const or volatile qualifiers) so make sure
12122 that we have the main variant (i.e. the unqualified version) of this
12124 if (type != type_main_variant (type))
12127 /* Do not check TREE_ASM_WRITTEN (type) as it may not be set if this is
12128 an instance of an unresolved type. */
12130 switch (TREE_CODE (type))
12135 case ENUMERAL_TYPE:
12136 gen_inlined_enumeration_type_die (type, context_die);
12140 gen_inlined_structure_type_die (type, context_die);
12144 case QUAL_UNION_TYPE:
12145 gen_inlined_union_type_die (type, context_die);
12153 /* Generate a DW_TAG_lexical_block DIE followed by DIEs to represent all of the
12154 things which are local to the given block. */
12157 gen_block_die (tree stmt, dw_die_ref context_die, int depth)
12159 int must_output_die = 0;
12162 enum tree_code origin_code;
12164 /* Ignore blocks never really used to make RTL. */
12165 if (stmt == NULL_TREE || !TREE_USED (stmt)
12166 || (!TREE_ASM_WRITTEN (stmt) && !BLOCK_ABSTRACT (stmt)))
12169 /* If the block is one fragment of a non-contiguous block, do not
12170 process the variables, since they will have been done by the
12171 origin block. Do process subblocks. */
12172 if (BLOCK_FRAGMENT_ORIGIN (stmt))
12176 for (sub = BLOCK_SUBBLOCKS (stmt); sub; sub = BLOCK_CHAIN (sub))
12177 gen_block_die (sub, context_die, depth + 1);
12182 /* Determine the "ultimate origin" of this block. This block may be an
12183 inlined instance of an inlined instance of inline function, so we have
12184 to trace all of the way back through the origin chain to find out what
12185 sort of node actually served as the original seed for the creation of
12186 the current block. */
12187 origin = block_ultimate_origin (stmt);
12188 origin_code = (origin != NULL) ? TREE_CODE (origin) : ERROR_MARK;
12190 /* Determine if we need to output any Dwarf DIEs at all to represent this
12192 if (origin_code == FUNCTION_DECL)
12193 /* The outer scopes for inlinings *must* always be represented. We
12194 generate DW_TAG_inlined_subroutine DIEs for them. (See below.) */
12195 must_output_die = 1;
12198 /* In the case where the current block represents an inlining of the
12199 "body block" of an inline function, we must *NOT* output any DIE for
12200 this block because we have already output a DIE to represent the whole
12201 inlined function scope and the "body block" of any function doesn't
12202 really represent a different scope according to ANSI C rules. So we
12203 check here to make sure that this block does not represent a "body
12204 block inlining" before trying to set the MUST_OUTPUT_DIE flag. */
12205 if (! is_body_block (origin ? origin : stmt))
12207 /* Determine if this block directly contains any "significant"
12208 local declarations which we will need to output DIEs for. */
12209 if (debug_info_level > DINFO_LEVEL_TERSE)
12210 /* We are not in terse mode so *any* local declaration counts
12211 as being a "significant" one. */
12212 must_output_die = (BLOCK_VARS (stmt) != NULL);
12214 /* We are in terse mode, so only local (nested) function
12215 definitions count as "significant" local declarations. */
12216 for (decl = BLOCK_VARS (stmt);
12217 decl != NULL; decl = TREE_CHAIN (decl))
12218 if (TREE_CODE (decl) == FUNCTION_DECL
12219 && DECL_INITIAL (decl))
12221 must_output_die = 1;
12227 /* It would be a waste of space to generate a Dwarf DW_TAG_lexical_block
12228 DIE for any block which contains no significant local declarations at
12229 all. Rather, in such cases we just call `decls_for_scope' so that any
12230 needed Dwarf info for any sub-blocks will get properly generated. Note
12231 that in terse mode, our definition of what constitutes a "significant"
12232 local declaration gets restricted to include only inlined function
12233 instances and local (nested) function definitions. */
12234 if (must_output_die)
12236 if (origin_code == FUNCTION_DECL)
12237 gen_inlined_subroutine_die (stmt, context_die, depth);
12239 gen_lexical_block_die (stmt, context_die, depth);
12242 decls_for_scope (stmt, context_die, depth);
12245 /* Generate all of the decls declared within a given scope and (recursively)
12246 all of its sub-blocks. */
12249 decls_for_scope (tree stmt, dw_die_ref context_die, int depth)
12254 /* Ignore blocks never really used to make RTL. */
12255 if (stmt == NULL_TREE || ! TREE_USED (stmt))
12258 /* Output the DIEs to represent all of the data objects and typedefs
12259 declared directly within this block but not within any nested
12260 sub-blocks. Also, nested function and tag DIEs have been
12261 generated with a parent of NULL; fix that up now. */
12262 for (decl = BLOCK_VARS (stmt); decl != NULL; decl = TREE_CHAIN (decl))
12266 if (TREE_CODE (decl) == FUNCTION_DECL)
12267 die = lookup_decl_die (decl);
12268 else if (TREE_CODE (decl) == TYPE_DECL && TYPE_DECL_IS_STUB (decl))
12269 die = lookup_type_die (TREE_TYPE (decl));
12273 if (die != NULL && die->die_parent == NULL)
12274 add_child_die (context_die, die);
12276 gen_decl_die (decl, context_die);
12279 /* If we're at -g1, we're not interested in subblocks. */
12280 if (debug_info_level <= DINFO_LEVEL_TERSE)
12283 /* Output the DIEs to represent all sub-blocks (and the items declared
12284 therein) of this block. */
12285 for (subblocks = BLOCK_SUBBLOCKS (stmt);
12287 subblocks = BLOCK_CHAIN (subblocks))
12288 gen_block_die (subblocks, context_die, depth + 1);
12291 /* Is this a typedef we can avoid emitting? */
12294 is_redundant_typedef (tree decl)
12296 if (TYPE_DECL_IS_STUB (decl))
12299 if (DECL_ARTIFICIAL (decl)
12300 && DECL_CONTEXT (decl)
12301 && is_tagged_type (DECL_CONTEXT (decl))
12302 && TREE_CODE (TYPE_NAME (DECL_CONTEXT (decl))) == TYPE_DECL
12303 && DECL_NAME (decl) == DECL_NAME (TYPE_NAME (DECL_CONTEXT (decl))))
12304 /* Also ignore the artificial member typedef for the class name. */
12310 /* Returns the DIE for decl or aborts. */
12313 force_decl_die (tree decl)
12315 dw_die_ref decl_die;
12316 unsigned saved_external_flag;
12317 tree save_fn = NULL_TREE;
12318 decl_die = lookup_decl_die (decl);
12321 dw_die_ref context_die;
12322 tree decl_context = DECL_CONTEXT (decl);
12325 /* Find die that represents this context. */
12326 if (TYPE_P (decl_context))
12327 context_die = force_type_die (decl_context);
12329 context_die = force_decl_die (decl_context);
12332 context_die = comp_unit_die;
12334 switch (TREE_CODE (decl))
12336 case FUNCTION_DECL:
12337 /* Clear current_function_decl, so that gen_subprogram_die thinks
12338 that this is a declaration. At this point, we just want to force
12339 declaration die. */
12340 save_fn = current_function_decl;
12341 current_function_decl = NULL_TREE;
12342 gen_subprogram_die (decl, context_die);
12343 current_function_decl = save_fn;
12347 /* Set external flag to force declaration die. Restore it after
12348 gen_decl_die() call. */
12349 saved_external_flag = DECL_EXTERNAL (decl);
12350 DECL_EXTERNAL (decl) = 1;
12351 gen_decl_die (decl, context_die);
12352 DECL_EXTERNAL (decl) = saved_external_flag;
12355 case NAMESPACE_DECL:
12356 dwarf2out_decl (decl);
12363 /* See if we can find the die for this deci now.
12364 If not then abort. */
12366 decl_die = lookup_decl_die (decl);
12374 /* Returns the DIE for decl or aborts. */
12377 force_type_die (tree type)
12379 dw_die_ref type_die;
12381 type_die = lookup_type_die (type);
12384 dw_die_ref context_die;
12385 if (TYPE_CONTEXT (type))
12386 if (TYPE_P (TYPE_CONTEXT (type)))
12387 context_die = force_type_die (TYPE_CONTEXT (type));
12389 context_die = force_decl_die (TYPE_CONTEXT (type));
12391 context_die = comp_unit_die;
12393 gen_type_die (type, context_die);
12394 type_die = lookup_type_die (type);
12401 /* Force out any required namespaces to be able to output DECL,
12402 and return the new context_die for it, if it's changed. */
12405 setup_namespace_context (tree thing, dw_die_ref context_die)
12407 tree context = DECL_P (thing) ? DECL_CONTEXT (thing) : TYPE_CONTEXT (thing);
12408 if (context && TREE_CODE (context) == NAMESPACE_DECL)
12409 /* Force out the namespace. */
12410 context_die = force_decl_die (context);
12412 return context_die;
12415 /* Emit a declaration DIE for THING (which is either a DECL or a tagged
12416 type) within its namespace, if appropriate.
12418 For compatibility with older debuggers, namespace DIEs only contain
12419 declarations; all definitions are emitted at CU scope. */
12422 declare_in_namespace (tree thing, dw_die_ref context_die)
12424 dw_die_ref ns_context;
12426 if (debug_info_level <= DINFO_LEVEL_TERSE)
12429 ns_context = setup_namespace_context (thing, context_die);
12431 if (ns_context != context_die)
12433 if (DECL_P (thing))
12434 gen_decl_die (thing, ns_context);
12436 gen_type_die (thing, ns_context);
12440 /* Generate a DIE for a namespace or namespace alias. */
12443 gen_namespace_die (tree decl)
12445 dw_die_ref context_die = setup_namespace_context (decl, comp_unit_die);
12447 /* Namespace aliases have a DECL_ABSTRACT_ORIGIN of the namespace
12448 they are an alias of. */
12449 if (DECL_ABSTRACT_ORIGIN (decl) == NULL)
12451 /* Output a real namespace. */
12452 dw_die_ref namespace_die
12453 = new_die (DW_TAG_namespace, context_die, decl);
12454 add_name_and_src_coords_attributes (namespace_die, decl);
12455 equate_decl_number_to_die (decl, namespace_die);
12459 /* Output a namespace alias. */
12461 /* Force out the namespace we are an alias of, if necessary. */
12462 dw_die_ref origin_die
12463 = force_decl_die (DECL_ABSTRACT_ORIGIN (decl));
12465 /* Now create the namespace alias DIE. */
12466 dw_die_ref namespace_die
12467 = new_die (DW_TAG_imported_declaration, context_die, decl);
12468 add_name_and_src_coords_attributes (namespace_die, decl);
12469 add_AT_die_ref (namespace_die, DW_AT_import, origin_die);
12470 equate_decl_number_to_die (decl, namespace_die);
12474 /* Generate Dwarf debug information for a decl described by DECL. */
12477 gen_decl_die (tree decl, dw_die_ref context_die)
12481 if (DECL_P (decl) && DECL_IGNORED_P (decl))
12484 switch (TREE_CODE (decl))
12490 /* The individual enumerators of an enum type get output when we output
12491 the Dwarf representation of the relevant enum type itself. */
12494 case FUNCTION_DECL:
12495 /* Don't output any DIEs to represent mere function declarations,
12496 unless they are class members or explicit block externs. */
12497 if (DECL_INITIAL (decl) == NULL_TREE && DECL_CONTEXT (decl) == NULL_TREE
12498 && (current_function_decl == NULL_TREE || DECL_ARTIFICIAL (decl)))
12501 /* If we're emitting a clone, emit info for the abstract instance. */
12502 if (DECL_ORIGIN (decl) != decl)
12503 dwarf2out_abstract_function (DECL_ABSTRACT_ORIGIN (decl));
12505 /* If we're emitting an out-of-line copy of an inline function,
12506 emit info for the abstract instance and set up to refer to it. */
12507 else if (cgraph_function_possibly_inlined_p (decl)
12508 && ! DECL_ABSTRACT (decl)
12509 && ! class_or_namespace_scope_p (context_die)
12510 /* dwarf2out_abstract_function won't emit a die if this is just
12511 a declaration. We must avoid setting DECL_ABSTRACT_ORIGIN in
12512 that case, because that works only if we have a die. */
12513 && DECL_INITIAL (decl) != NULL_TREE)
12515 dwarf2out_abstract_function (decl);
12516 set_decl_origin_self (decl);
12519 /* Otherwise we're emitting the primary DIE for this decl. */
12520 else if (debug_info_level > DINFO_LEVEL_TERSE)
12522 /* Before we describe the FUNCTION_DECL itself, make sure that we
12523 have described its return type. */
12524 gen_type_die (TREE_TYPE (TREE_TYPE (decl)), context_die);
12526 /* And its virtual context. */
12527 if (DECL_VINDEX (decl) != NULL_TREE)
12528 gen_type_die (DECL_CONTEXT (decl), context_die);
12530 /* And its containing type. */
12531 origin = decl_class_context (decl);
12532 if (origin != NULL_TREE)
12533 gen_type_die_for_member (origin, decl, context_die);
12535 /* And its containing namespace. */
12536 declare_in_namespace (decl, context_die);
12539 /* Now output a DIE to represent the function itself. */
12540 gen_subprogram_die (decl, context_die);
12544 /* If we are in terse mode, don't generate any DIEs to represent any
12545 actual typedefs. */
12546 if (debug_info_level <= DINFO_LEVEL_TERSE)
12549 /* In the special case of a TYPE_DECL node representing the declaration
12550 of some type tag, if the given TYPE_DECL is marked as having been
12551 instantiated from some other (original) TYPE_DECL node (e.g. one which
12552 was generated within the original definition of an inline function) we
12553 have to generate a special (abbreviated) DW_TAG_structure_type,
12554 DW_TAG_union_type, or DW_TAG_enumeration_type DIE here. */
12555 if (TYPE_DECL_IS_STUB (decl) && decl_ultimate_origin (decl) != NULL_TREE)
12557 gen_tagged_type_instantiation_die (TREE_TYPE (decl), context_die);
12561 if (is_redundant_typedef (decl))
12562 gen_type_die (TREE_TYPE (decl), context_die);
12564 /* Output a DIE to represent the typedef itself. */
12565 gen_typedef_die (decl, context_die);
12569 if (debug_info_level >= DINFO_LEVEL_NORMAL)
12570 gen_label_die (decl, context_die);
12574 /* If we are in terse mode, don't generate any DIEs to represent any
12575 variable declarations or definitions. */
12576 if (debug_info_level <= DINFO_LEVEL_TERSE)
12579 /* Output any DIEs that are needed to specify the type of this data
12581 gen_type_die (TREE_TYPE (decl), context_die);
12583 /* And its containing type. */
12584 origin = decl_class_context (decl);
12585 if (origin != NULL_TREE)
12586 gen_type_die_for_member (origin, decl, context_die);
12588 /* And its containing namespace. */
12589 declare_in_namespace (decl, context_die);
12591 /* Now output the DIE to represent the data object itself. This gets
12592 complicated because of the possibility that the VAR_DECL really
12593 represents an inlined instance of a formal parameter for an inline
12595 origin = decl_ultimate_origin (decl);
12596 if (origin != NULL_TREE && TREE_CODE (origin) == PARM_DECL)
12597 gen_formal_parameter_die (decl, context_die);
12599 gen_variable_die (decl, context_die);
12603 /* Ignore the nameless fields that are used to skip bits but handle C++
12604 anonymous unions and structs. */
12605 if (DECL_NAME (decl) != NULL_TREE
12606 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
12607 || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE)
12609 gen_type_die (member_declared_type (decl), context_die);
12610 gen_field_die (decl, context_die);
12615 gen_type_die (TREE_TYPE (decl), context_die);
12616 gen_formal_parameter_die (decl, context_die);
12619 case NAMESPACE_DECL:
12620 gen_namespace_die (decl);
12624 if ((int)TREE_CODE (decl) > NUM_TREE_CODES)
12625 /* Probably some frontend-internal decl. Assume we don't care. */
12631 /* Add Ada "use" clause information for SGI Workshop debugger. */
12634 dwarf2out_add_library_unit_info (const char *filename, const char *context_list)
12636 unsigned int file_index;
12638 if (filename != NULL)
12640 dw_die_ref unit_die = new_die (DW_TAG_module, comp_unit_die, NULL);
12641 tree context_list_decl
12642 = build_decl (LABEL_DECL, get_identifier (context_list),
12645 TREE_PUBLIC (context_list_decl) = TRUE;
12646 add_name_attribute (unit_die, context_list);
12647 file_index = lookup_filename (filename);
12648 add_AT_unsigned (unit_die, DW_AT_decl_file, file_index);
12649 add_pubname (context_list_decl, unit_die);
12653 /* Output debug information for global decl DECL. Called from toplev.c after
12654 compilation proper has finished. */
12657 dwarf2out_global_decl (tree decl)
12659 /* Output DWARF2 information for file-scope tentative data object
12660 declarations, file-scope (extern) function declarations (which had no
12661 corresponding body) and file-scope tagged type declarations and
12662 definitions which have not yet been forced out. */
12663 if (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl))
12664 dwarf2out_decl (decl);
12667 /* Output debug information for type decl DECL. Called from toplev.c
12668 and from language front ends (to record built-in types). */
12670 dwarf2out_type_decl (tree decl, int local)
12673 dwarf2out_decl (decl);
12676 /* Output debug information for imported module or decl. */
12679 dwarf2out_imported_module_or_decl (tree decl, tree context)
12681 dw_die_ref imported_die, at_import_die;
12682 dw_die_ref scope_die;
12683 unsigned file_index;
12685 if (debug_info_level <= DINFO_LEVEL_TERSE)
12691 /* To emit DW_TAG_imported_module or DW_TAG_imported_decl, we need two DIEs.
12692 We need decl DIE for reference and scope die. First, get DIE for the decl
12695 /* Get the scope die for decl context. Use comp_unit_die for global module
12696 or decl. If die is not found for non globals, force new die. */
12698 scope_die = comp_unit_die;
12699 else if (TYPE_P (context))
12700 scope_die = force_type_die (context);
12702 scope_die = force_decl_die (context);
12704 /* For TYPE_DECL, lookup TREE_TYPE. */
12705 if (TREE_CODE (decl) == TYPE_DECL)
12706 at_import_die = force_type_die (TREE_TYPE (decl));
12708 at_import_die = force_decl_die (decl);
12710 /* OK, now we have DIEs for decl as well as scope. Emit imported die. */
12711 if (TREE_CODE (decl) == NAMESPACE_DECL)
12712 imported_die = new_die (DW_TAG_imported_module, scope_die, context);
12714 imported_die = new_die (DW_TAG_imported_declaration, scope_die, context);
12716 file_index = lookup_filename (input_filename);
12717 add_AT_unsigned (imported_die, DW_AT_decl_file, file_index);
12718 add_AT_unsigned (imported_die, DW_AT_decl_line, input_line);
12719 add_AT_die_ref (imported_die, DW_AT_import, at_import_die);
12722 /* Write the debugging output for DECL. */
12725 dwarf2out_decl (tree decl)
12727 dw_die_ref context_die = comp_unit_die;
12729 switch (TREE_CODE (decl))
12734 case FUNCTION_DECL:
12735 /* What we would really like to do here is to filter out all mere
12736 file-scope declarations of file-scope functions which are never
12737 referenced later within this translation unit (and keep all of ones
12738 that *are* referenced later on) but we aren't clairvoyant, so we have
12739 no idea which functions will be referenced in the future (i.e. later
12740 on within the current translation unit). So here we just ignore all
12741 file-scope function declarations which are not also definitions. If
12742 and when the debugger needs to know something about these functions,
12743 it will have to hunt around and find the DWARF information associated
12744 with the definition of the function.
12746 We can't just check DECL_EXTERNAL to find out which FUNCTION_DECL
12747 nodes represent definitions and which ones represent mere
12748 declarations. We have to check DECL_INITIAL instead. That's because
12749 the C front-end supports some weird semantics for "extern inline"
12750 function definitions. These can get inlined within the current
12751 translation unit (an thus, we need to generate Dwarf info for their
12752 abstract instances so that the Dwarf info for the concrete inlined
12753 instances can have something to refer to) but the compiler never
12754 generates any out-of-lines instances of such things (despite the fact
12755 that they *are* definitions).
12757 The important point is that the C front-end marks these "extern
12758 inline" functions as DECL_EXTERNAL, but we need to generate DWARF for
12759 them anyway. Note that the C++ front-end also plays some similar games
12760 for inline function definitions appearing within include files which
12761 also contain `#pragma interface' pragmas. */
12762 if (DECL_INITIAL (decl) == NULL_TREE)
12765 /* If we're a nested function, initially use a parent of NULL; if we're
12766 a plain function, this will be fixed up in decls_for_scope. If
12767 we're a method, it will be ignored, since we already have a DIE. */
12768 if (decl_function_context (decl)
12769 /* But if we're in terse mode, we don't care about scope. */
12770 && debug_info_level > DINFO_LEVEL_TERSE)
12771 context_die = NULL;
12775 /* Ignore this VAR_DECL if it refers to a file-scope extern data object
12776 declaration and if the declaration was never even referenced from
12777 within this entire compilation unit. We suppress these DIEs in
12778 order to save space in the .debug section (by eliminating entries
12779 which are probably useless). Note that we must not suppress
12780 block-local extern declarations (whether used or not) because that
12781 would screw-up the debugger's name lookup mechanism and cause it to
12782 miss things which really ought to be in scope at a given point. */
12783 if (DECL_EXTERNAL (decl) && !TREE_USED (decl))
12786 /* If we are in terse mode, don't generate any DIEs to represent any
12787 variable declarations or definitions. */
12788 if (debug_info_level <= DINFO_LEVEL_TERSE)
12792 case NAMESPACE_DECL:
12793 if (debug_info_level <= DINFO_LEVEL_TERSE)
12795 if (lookup_decl_die (decl) != NULL)
12800 /* Don't emit stubs for types unless they are needed by other DIEs. */
12801 if (TYPE_DECL_SUPPRESS_DEBUG (decl))
12804 /* Don't bother trying to generate any DIEs to represent any of the
12805 normal built-in types for the language we are compiling. */
12806 if (DECL_SOURCE_LINE (decl) == 0)
12808 /* OK, we need to generate one for `bool' so GDB knows what type
12809 comparisons have. */
12810 if ((get_AT_unsigned (comp_unit_die, DW_AT_language)
12811 == DW_LANG_C_plus_plus)
12812 && TREE_CODE (TREE_TYPE (decl)) == BOOLEAN_TYPE
12813 && ! DECL_IGNORED_P (decl))
12814 modified_type_die (TREE_TYPE (decl), 0, 0, NULL);
12819 /* If we are in terse mode, don't generate any DIEs for types. */
12820 if (debug_info_level <= DINFO_LEVEL_TERSE)
12823 /* If we're a function-scope tag, initially use a parent of NULL;
12824 this will be fixed up in decls_for_scope. */
12825 if (decl_function_context (decl))
12826 context_die = NULL;
12834 gen_decl_die (decl, context_die);
12837 /* Output a marker (i.e. a label) for the beginning of the generated code for
12838 a lexical block. */
12841 dwarf2out_begin_block (unsigned int line ATTRIBUTE_UNUSED,
12842 unsigned int blocknum)
12844 function_section (current_function_decl);
12845 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, BLOCK_BEGIN_LABEL, blocknum);
12848 /* Output a marker (i.e. a label) for the end of the generated code for a
12852 dwarf2out_end_block (unsigned int line ATTRIBUTE_UNUSED, unsigned int blocknum)
12854 function_section (current_function_decl);
12855 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, BLOCK_END_LABEL, blocknum);
12858 /* Returns nonzero if it is appropriate not to emit any debugging
12859 information for BLOCK, because it doesn't contain any instructions.
12861 Don't allow this for blocks with nested functions or local classes
12862 as we would end up with orphans, and in the presence of scheduling
12863 we may end up calling them anyway. */
12866 dwarf2out_ignore_block (tree block)
12870 for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl))
12871 if (TREE_CODE (decl) == FUNCTION_DECL
12872 || (TREE_CODE (decl) == TYPE_DECL && TYPE_DECL_IS_STUB (decl)))
12878 /* Lookup FILE_NAME (in the list of filenames that we know about here in
12879 dwarf2out.c) and return its "index". The index of each (known) filename is
12880 just a unique number which is associated with only that one filename. We
12881 need such numbers for the sake of generating labels (in the .debug_sfnames
12882 section) and references to those files numbers (in the .debug_srcinfo
12883 and.debug_macinfo sections). If the filename given as an argument is not
12884 found in our current list, add it to the list and assign it the next
12885 available unique index number. In order to speed up searches, we remember
12886 the index of the filename was looked up last. This handles the majority of
12890 lookup_filename (const char *file_name)
12893 char *save_file_name;
12895 /* Check to see if the file name that was searched on the previous
12896 call matches this file name. If so, return the index. */
12897 if (file_table_last_lookup_index != 0)
12900 = VARRAY_CHAR_PTR (file_table, file_table_last_lookup_index);
12901 if (strcmp (file_name, last) == 0)
12902 return file_table_last_lookup_index;
12905 /* Didn't match the previous lookup, search the table */
12906 n = VARRAY_ACTIVE_SIZE (file_table);
12907 for (i = 1; i < n; i++)
12908 if (strcmp (file_name, VARRAY_CHAR_PTR (file_table, i)) == 0)
12910 file_table_last_lookup_index = i;
12914 /* Add the new entry to the end of the filename table. */
12915 file_table_last_lookup_index = n;
12916 save_file_name = (char *) ggc_strdup (file_name);
12917 VARRAY_PUSH_CHAR_PTR (file_table, save_file_name);
12918 VARRAY_PUSH_UINT (file_table_emitted, 0);
12924 maybe_emit_file (int fileno)
12926 if (DWARF2_ASM_LINE_DEBUG_INFO && fileno > 0)
12928 if (!VARRAY_UINT (file_table_emitted, fileno))
12930 VARRAY_UINT (file_table_emitted, fileno) = ++emitcount;
12931 fprintf (asm_out_file, "\t.file %u ",
12932 VARRAY_UINT (file_table_emitted, fileno));
12933 output_quoted_string (asm_out_file,
12934 VARRAY_CHAR_PTR (file_table, fileno));
12935 fputc ('\n', asm_out_file);
12937 return VARRAY_UINT (file_table_emitted, fileno);
12944 init_file_table (void)
12946 /* Allocate the initial hunk of the file_table. */
12947 VARRAY_CHAR_PTR_INIT (file_table, 64, "file_table");
12948 VARRAY_UINT_INIT (file_table_emitted, 64, "file_table_emitted");
12950 /* Skip the first entry - file numbers begin at 1. */
12951 VARRAY_PUSH_CHAR_PTR (file_table, NULL);
12952 VARRAY_PUSH_UINT (file_table_emitted, 0);
12953 file_table_last_lookup_index = 0;
12956 /* Called by the final INSN scan whenever we see a var location. We
12957 use it to drop labels in the right places, and throw the location in
12958 our lookup table. */
12961 dwarf2out_var_location (rtx loc_note)
12963 char loclabel[MAX_ARTIFICIAL_LABEL_BYTES];
12964 struct var_loc_node *newloc;
12966 static rtx last_insn;
12967 static const char *last_label;
12969 if (!DECL_P (NOTE_VAR_LOCATION_DECL (loc_note)))
12971 prev_insn = PREV_INSN (loc_note);
12973 newloc = ggc_alloc_cleared (sizeof (struct var_loc_node));
12974 /* If the insn we processed last time is the previous insn
12975 and it is also a var location note, use the label we emitted
12977 if (last_insn != NULL_RTX
12978 && last_insn == prev_insn
12979 && GET_CODE (prev_insn) == NOTE
12980 && NOTE_LINE_NUMBER (prev_insn) == NOTE_INSN_VAR_LOCATION)
12982 newloc->label = last_label;
12986 ASM_GENERATE_INTERNAL_LABEL (loclabel, "LVL", loclabel_num);
12987 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LVL", loclabel_num);
12989 newloc->label = ggc_strdup (loclabel);
12991 newloc->var_loc_note = loc_note;
12992 newloc->next = NULL;
12994 last_insn = loc_note;
12995 last_label = newloc->label;
12997 add_var_loc_to_decl (NOTE_VAR_LOCATION_DECL (loc_note), newloc);
13000 /* We need to reset the locations at the beginning of each
13001 function. We can't do this in the end_function hook, because the
13002 declarations that use the locations won't have been outputted when
13003 that hook is called. */
13006 dwarf2out_begin_function (tree unused ATTRIBUTE_UNUSED)
13008 htab_empty (decl_loc_table);
13011 /* Output a label to mark the beginning of a source code line entry
13012 and record information relating to this source line, in
13013 'line_info_table' for later output of the .debug_line section. */
13016 dwarf2out_source_line (unsigned int line, const char *filename)
13018 if (debug_info_level >= DINFO_LEVEL_NORMAL
13021 function_section (current_function_decl);
13023 /* If requested, emit something human-readable. */
13024 if (flag_debug_asm)
13025 fprintf (asm_out_file, "\t%s %s:%d\n", ASM_COMMENT_START,
13028 if (DWARF2_ASM_LINE_DEBUG_INFO)
13030 unsigned file_num = lookup_filename (filename);
13032 file_num = maybe_emit_file (file_num);
13034 /* Emit the .loc directive understood by GNU as. */
13035 fprintf (asm_out_file, "\t.loc %d %d 0\n", file_num, line);
13037 /* Indicate that line number info exists. */
13038 line_info_table_in_use++;
13040 /* Indicate that multiple line number tables exist. */
13041 if (DECL_SECTION_NAME (current_function_decl))
13042 separate_line_info_table_in_use++;
13044 else if (DECL_SECTION_NAME (current_function_decl))
13046 dw_separate_line_info_ref line_info;
13047 (*targetm.asm_out.internal_label) (asm_out_file, SEPARATE_LINE_CODE_LABEL,
13048 separate_line_info_table_in_use);
13050 /* Expand the line info table if necessary. */
13051 if (separate_line_info_table_in_use
13052 == separate_line_info_table_allocated)
13054 separate_line_info_table_allocated += LINE_INFO_TABLE_INCREMENT;
13055 separate_line_info_table
13056 = ggc_realloc (separate_line_info_table,
13057 separate_line_info_table_allocated
13058 * sizeof (dw_separate_line_info_entry));
13059 memset (separate_line_info_table
13060 + separate_line_info_table_in_use,
13062 (LINE_INFO_TABLE_INCREMENT
13063 * sizeof (dw_separate_line_info_entry)));
13066 /* Add the new entry at the end of the line_info_table. */
13068 = &separate_line_info_table[separate_line_info_table_in_use++];
13069 line_info->dw_file_num = lookup_filename (filename);
13070 line_info->dw_line_num = line;
13071 line_info->function = current_function_funcdef_no;
13075 dw_line_info_ref line_info;
13077 (*targetm.asm_out.internal_label) (asm_out_file, LINE_CODE_LABEL,
13078 line_info_table_in_use);
13080 /* Expand the line info table if necessary. */
13081 if (line_info_table_in_use == line_info_table_allocated)
13083 line_info_table_allocated += LINE_INFO_TABLE_INCREMENT;
13085 = ggc_realloc (line_info_table,
13086 (line_info_table_allocated
13087 * sizeof (dw_line_info_entry)));
13088 memset (line_info_table + line_info_table_in_use, 0,
13089 LINE_INFO_TABLE_INCREMENT * sizeof (dw_line_info_entry));
13092 /* Add the new entry at the end of the line_info_table. */
13093 line_info = &line_info_table[line_info_table_in_use++];
13094 line_info->dw_file_num = lookup_filename (filename);
13095 line_info->dw_line_num = line;
13100 /* Record the beginning of a new source file. */
13103 dwarf2out_start_source_file (unsigned int lineno, const char *filename)
13105 if (flag_eliminate_dwarf2_dups)
13107 /* Record the beginning of the file for break_out_includes. */
13108 dw_die_ref bincl_die;
13110 bincl_die = new_die (DW_TAG_GNU_BINCL, comp_unit_die, NULL);
13111 add_AT_string (bincl_die, DW_AT_name, filename);
13114 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13116 named_section_flags (DEBUG_MACINFO_SECTION, SECTION_DEBUG);
13117 dw2_asm_output_data (1, DW_MACINFO_start_file, "Start new file");
13118 dw2_asm_output_data_uleb128 (lineno, "Included from line number %d",
13120 maybe_emit_file (lookup_filename (filename));
13121 dw2_asm_output_data_uleb128 (lookup_filename (filename),
13122 "Filename we just started");
13126 /* Record the end of a source file. */
13129 dwarf2out_end_source_file (unsigned int lineno ATTRIBUTE_UNUSED)
13131 if (flag_eliminate_dwarf2_dups)
13132 /* Record the end of the file for break_out_includes. */
13133 new_die (DW_TAG_GNU_EINCL, comp_unit_die, NULL);
13135 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13137 named_section_flags (DEBUG_MACINFO_SECTION, SECTION_DEBUG);
13138 dw2_asm_output_data (1, DW_MACINFO_end_file, "End file");
13142 /* Called from debug_define in toplev.c. The `buffer' parameter contains
13143 the tail part of the directive line, i.e. the part which is past the
13144 initial whitespace, #, whitespace, directive-name, whitespace part. */
13147 dwarf2out_define (unsigned int lineno ATTRIBUTE_UNUSED,
13148 const char *buffer ATTRIBUTE_UNUSED)
13150 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13152 named_section_flags (DEBUG_MACINFO_SECTION, SECTION_DEBUG);
13153 dw2_asm_output_data (1, DW_MACINFO_define, "Define macro");
13154 dw2_asm_output_data_uleb128 (lineno, "At line number %d", lineno);
13155 dw2_asm_output_nstring (buffer, -1, "The macro");
13159 /* Called from debug_undef in toplev.c. The `buffer' parameter contains
13160 the tail part of the directive line, i.e. the part which is past the
13161 initial whitespace, #, whitespace, directive-name, whitespace part. */
13164 dwarf2out_undef (unsigned int lineno ATTRIBUTE_UNUSED,
13165 const char *buffer ATTRIBUTE_UNUSED)
13167 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13169 named_section_flags (DEBUG_MACINFO_SECTION, SECTION_DEBUG);
13170 dw2_asm_output_data (1, DW_MACINFO_undef, "Undefine macro");
13171 dw2_asm_output_data_uleb128 (lineno, "At line number %d", lineno);
13172 dw2_asm_output_nstring (buffer, -1, "The macro");
13176 /* Set up for Dwarf output at the start of compilation. */
13179 dwarf2out_init (const char *filename ATTRIBUTE_UNUSED)
13181 init_file_table ();
13183 /* Allocate the decl_die_table. */
13184 decl_die_table = htab_create_ggc (10, decl_die_table_hash,
13185 decl_die_table_eq, NULL);
13187 /* Allocate the decl_loc_table. */
13188 decl_loc_table = htab_create_ggc (10, decl_loc_table_hash,
13189 decl_loc_table_eq, NULL);
13191 /* Allocate the initial hunk of the decl_scope_table. */
13192 VARRAY_TREE_INIT (decl_scope_table, 256, "decl_scope_table");
13194 /* Allocate the initial hunk of the abbrev_die_table. */
13195 abbrev_die_table = ggc_alloc_cleared (ABBREV_DIE_TABLE_INCREMENT
13196 * sizeof (dw_die_ref));
13197 abbrev_die_table_allocated = ABBREV_DIE_TABLE_INCREMENT;
13198 /* Zero-th entry is allocated, but unused */
13199 abbrev_die_table_in_use = 1;
13201 /* Allocate the initial hunk of the line_info_table. */
13202 line_info_table = ggc_alloc_cleared (LINE_INFO_TABLE_INCREMENT
13203 * sizeof (dw_line_info_entry));
13204 line_info_table_allocated = LINE_INFO_TABLE_INCREMENT;
13206 /* Zero-th entry is allocated, but unused */
13207 line_info_table_in_use = 1;
13209 /* Generate the initial DIE for the .debug section. Note that the (string)
13210 value given in the DW_AT_name attribute of the DW_TAG_compile_unit DIE
13211 will (typically) be a relative pathname and that this pathname should be
13212 taken as being relative to the directory from which the compiler was
13213 invoked when the given (base) source file was compiled. We will fill
13214 in this value in dwarf2out_finish. */
13215 comp_unit_die = gen_compile_unit_die (NULL);
13217 VARRAY_TREE_INIT (incomplete_types, 64, "incomplete_types");
13219 VARRAY_RTX_INIT (used_rtx_varray, 32, "used_rtx_varray");
13221 ASM_GENERATE_INTERNAL_LABEL (text_end_label, TEXT_END_LABEL, 0);
13222 ASM_GENERATE_INTERNAL_LABEL (abbrev_section_label,
13223 DEBUG_ABBREV_SECTION_LABEL, 0);
13224 if (DWARF2_GENERATE_TEXT_SECTION_LABEL)
13225 ASM_GENERATE_INTERNAL_LABEL (text_section_label, TEXT_SECTION_LABEL, 0);
13227 strcpy (text_section_label, stripattributes (TEXT_SECTION_NAME));
13229 ASM_GENERATE_INTERNAL_LABEL (debug_info_section_label,
13230 DEBUG_INFO_SECTION_LABEL, 0);
13231 ASM_GENERATE_INTERNAL_LABEL (debug_line_section_label,
13232 DEBUG_LINE_SECTION_LABEL, 0);
13233 ASM_GENERATE_INTERNAL_LABEL (ranges_section_label,
13234 DEBUG_RANGES_SECTION_LABEL, 0);
13235 named_section_flags (DEBUG_ABBREV_SECTION, SECTION_DEBUG);
13236 ASM_OUTPUT_LABEL (asm_out_file, abbrev_section_label);
13237 named_section_flags (DEBUG_INFO_SECTION, SECTION_DEBUG);
13238 ASM_OUTPUT_LABEL (asm_out_file, debug_info_section_label);
13239 named_section_flags (DEBUG_LINE_SECTION, SECTION_DEBUG);
13240 ASM_OUTPUT_LABEL (asm_out_file, debug_line_section_label);
13242 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13244 named_section_flags (DEBUG_MACINFO_SECTION, SECTION_DEBUG);
13245 ASM_GENERATE_INTERNAL_LABEL (macinfo_section_label,
13246 DEBUG_MACINFO_SECTION_LABEL, 0);
13247 ASM_OUTPUT_LABEL (asm_out_file, macinfo_section_label);
13250 if (DWARF2_GENERATE_TEXT_SECTION_LABEL)
13253 ASM_OUTPUT_LABEL (asm_out_file, text_section_label);
13257 /* A helper function for dwarf2out_finish called through
13258 ht_forall. Emit one queued .debug_str string. */
13261 output_indirect_string (void **h, void *v ATTRIBUTE_UNUSED)
13263 struct indirect_string_node *node = (struct indirect_string_node *) *h;
13265 if (node->form == DW_FORM_strp)
13267 named_section_flags (DEBUG_STR_SECTION, DEBUG_STR_SECTION_FLAGS);
13268 ASM_OUTPUT_LABEL (asm_out_file, node->label);
13269 assemble_string (node->str, strlen (node->str) + 1);
13277 /* Clear the marks for a die and its children.
13278 Be cool if the mark isn't set. */
13281 prune_unmark_dies (dw_die_ref die)
13285 for (c = die->die_child; c; c = c->die_sib)
13286 prune_unmark_dies (c);
13290 /* Given DIE that we're marking as used, find any other dies
13291 it references as attributes and mark them as used. */
13294 prune_unused_types_walk_attribs (dw_die_ref die)
13298 for (a = die->die_attr; a != NULL; a = a->dw_attr_next)
13300 if (a->dw_attr_val.val_class == dw_val_class_die_ref)
13302 /* A reference to another DIE.
13303 Make sure that it will get emitted. */
13304 prune_unused_types_mark (a->dw_attr_val.v.val_die_ref.die, 1);
13306 else if (a->dw_attr == DW_AT_decl_file)
13308 /* A reference to a file. Make sure the file name is emitted. */
13309 a->dw_attr_val.v.val_unsigned =
13310 maybe_emit_file (a->dw_attr_val.v.val_unsigned);
13316 /* Mark DIE as being used. If DOKIDS is true, then walk down
13317 to DIE's children. */
13320 prune_unused_types_mark (dw_die_ref die, int dokids)
13324 if (die->die_mark == 0)
13326 /* We haven't done this node yet. Mark it as used. */
13329 /* We also have to mark its parents as used.
13330 (But we don't want to mark our parents' kids due to this.) */
13331 if (die->die_parent)
13332 prune_unused_types_mark (die->die_parent, 0);
13334 /* Mark any referenced nodes. */
13335 prune_unused_types_walk_attribs (die);
13337 /* If this node is a specification,
13338 also mark the definition, if it exists. */
13339 if (get_AT_flag (die, DW_AT_declaration) && die->die_definition)
13340 prune_unused_types_mark (die->die_definition, 1);
13343 if (dokids && die->die_mark != 2)
13345 /* We need to walk the children, but haven't done so yet.
13346 Remember that we've walked the kids. */
13350 for (c = die->die_child; c; c = c->die_sib)
13352 /* If this is an array type, we need to make sure our
13353 kids get marked, even if they're types. */
13354 if (die->die_tag == DW_TAG_array_type)
13355 prune_unused_types_mark (c, 1);
13357 prune_unused_types_walk (c);
13363 /* Walk the tree DIE and mark types that we actually use. */
13366 prune_unused_types_walk (dw_die_ref die)
13370 /* Don't do anything if this node is already marked. */
13374 switch (die->die_tag) {
13375 case DW_TAG_const_type:
13376 case DW_TAG_packed_type:
13377 case DW_TAG_pointer_type:
13378 case DW_TAG_reference_type:
13379 case DW_TAG_volatile_type:
13380 case DW_TAG_typedef:
13381 case DW_TAG_array_type:
13382 case DW_TAG_structure_type:
13383 case DW_TAG_union_type:
13384 case DW_TAG_class_type:
13385 case DW_TAG_friend:
13386 case DW_TAG_variant_part:
13387 case DW_TAG_enumeration_type:
13388 case DW_TAG_subroutine_type:
13389 case DW_TAG_string_type:
13390 case DW_TAG_set_type:
13391 case DW_TAG_subrange_type:
13392 case DW_TAG_ptr_to_member_type:
13393 case DW_TAG_file_type:
13394 /* It's a type node --- don't mark it. */
13398 /* Mark everything else. */
13404 /* Now, mark any dies referenced from here. */
13405 prune_unused_types_walk_attribs (die);
13407 /* Mark children. */
13408 for (c = die->die_child; c; c = c->die_sib)
13409 prune_unused_types_walk (c);
13413 /* Remove from the tree DIE any dies that aren't marked. */
13416 prune_unused_types_prune (dw_die_ref die)
13418 dw_die_ref c, p, n;
13419 if (!die->die_mark)
13423 for (c = die->die_child; c; c = n)
13428 prune_unused_types_prune (c);
13436 die->die_child = n;
13443 /* Remove dies representing declarations that we never use. */
13446 prune_unused_types (void)
13449 limbo_die_node *node;
13451 /* Clear all the marks. */
13452 prune_unmark_dies (comp_unit_die);
13453 for (node = limbo_die_list; node; node = node->next)
13454 prune_unmark_dies (node->die);
13456 /* Set the mark on nodes that are actually used. */
13457 prune_unused_types_walk (comp_unit_die);
13458 for (node = limbo_die_list; node; node = node->next)
13459 prune_unused_types_walk (node->die);
13461 /* Also set the mark on nodes referenced from the
13462 pubname_table or arange_table. */
13463 for (i = 0; i < pubname_table_in_use; i++)
13464 prune_unused_types_mark (pubname_table[i].die, 1);
13465 for (i = 0; i < arange_table_in_use; i++)
13466 prune_unused_types_mark (arange_table[i], 1);
13468 /* Get rid of nodes that aren't marked. */
13469 prune_unused_types_prune (comp_unit_die);
13470 for (node = limbo_die_list; node; node = node->next)
13471 prune_unused_types_prune (node->die);
13473 /* Leave the marks clear. */
13474 prune_unmark_dies (comp_unit_die);
13475 for (node = limbo_die_list; node; node = node->next)
13476 prune_unmark_dies (node->die);
13479 /* Output stuff that dwarf requires at the end of every file,
13480 and generate the DWARF-2 debugging info. */
13483 dwarf2out_finish (const char *filename)
13485 limbo_die_node *node, *next_node;
13486 dw_die_ref die = 0;
13488 /* Add the name for the main input file now. We delayed this from
13489 dwarf2out_init to avoid complications with PCH. */
13490 add_name_attribute (comp_unit_die, filename);
13491 if (filename[0] != DIR_SEPARATOR)
13492 add_comp_dir_attribute (comp_unit_die);
13493 else if (get_AT (comp_unit_die, DW_AT_comp_dir) == NULL)
13496 for (i = 1; i < VARRAY_ACTIVE_SIZE (file_table); i++)
13497 if (VARRAY_CHAR_PTR (file_table, i)[0] != DIR_SEPARATOR
13498 /* Don't add cwd for <built-in>. */
13499 && VARRAY_CHAR_PTR (file_table, i)[0] != '<')
13501 add_comp_dir_attribute (comp_unit_die);
13506 /* Traverse the limbo die list, and add parent/child links. The only
13507 dies without parents that should be here are concrete instances of
13508 inline functions, and the comp_unit_die. We can ignore the comp_unit_die.
13509 For concrete instances, we can get the parent die from the abstract
13511 for (node = limbo_die_list; node; node = next_node)
13513 next_node = node->next;
13516 if (die->die_parent == NULL)
13518 dw_die_ref origin = get_AT_ref (die, DW_AT_abstract_origin);
13522 add_child_die (origin->die_parent, die);
13523 else if (die == comp_unit_die)
13525 /* If this was an expression for a bound involved in a function
13526 return type, it may be a SAVE_EXPR for which we weren't able
13527 to find a DIE previously. So try now. */
13528 else if (node->created_for
13529 && TREE_CODE (node->created_for) == SAVE_EXPR
13530 && 0 != (origin = (lookup_decl_die
13532 (node->created_for)))))
13533 add_child_die (origin, die);
13534 else if (errorcount > 0 || sorrycount > 0)
13535 /* It's OK to be confused by errors in the input. */
13536 add_child_die (comp_unit_die, die);
13537 else if (node->created_for
13538 && ((DECL_P (node->created_for)
13539 && (context = DECL_CONTEXT (node->created_for)))
13540 || (TYPE_P (node->created_for)
13541 && (context = TYPE_CONTEXT (node->created_for))))
13542 && TREE_CODE (context) == FUNCTION_DECL)
13544 /* In certain situations, the lexical block containing a
13545 nested function can be optimized away, which results
13546 in the nested function die being orphaned. Likewise
13547 with the return type of that nested function. Force
13548 this to be a child of the containing function. */
13549 origin = lookup_decl_die (context);
13552 add_child_die (origin, die);
13559 limbo_die_list = NULL;
13561 /* Walk through the list of incomplete types again, trying once more to
13562 emit full debugging info for them. */
13563 retry_incomplete_types ();
13565 /* We need to reverse all the dies before break_out_includes, or
13566 we'll see the end of an include file before the beginning. */
13567 reverse_all_dies (comp_unit_die);
13569 if (flag_eliminate_unused_debug_types)
13570 prune_unused_types ();
13572 /* Generate separate CUs for each of the include files we've seen.
13573 They will go into limbo_die_list. */
13574 if (flag_eliminate_dwarf2_dups)
13575 break_out_includes (comp_unit_die);
13577 /* Traverse the DIE's and add add sibling attributes to those DIE's
13578 that have children. */
13579 add_sibling_attributes (comp_unit_die);
13580 for (node = limbo_die_list; node; node = node->next)
13581 add_sibling_attributes (node->die);
13583 /* Output a terminator label for the .text section. */
13585 (*targetm.asm_out.internal_label) (asm_out_file, TEXT_END_LABEL, 0);
13587 /* Output the source line correspondence table. We must do this
13588 even if there is no line information. Otherwise, on an empty
13589 translation unit, we will generate a present, but empty,
13590 .debug_info section. IRIX 6.5 `nm' will then complain when
13591 examining the file. */
13592 if (! DWARF2_ASM_LINE_DEBUG_INFO)
13594 named_section_flags (DEBUG_LINE_SECTION, SECTION_DEBUG);
13595 output_line_info ();
13598 /* Output location list section if necessary. */
13599 if (have_location_lists)
13601 /* Output the location lists info. */
13602 named_section_flags (DEBUG_LOC_SECTION, SECTION_DEBUG);
13603 ASM_GENERATE_INTERNAL_LABEL (loc_section_label,
13604 DEBUG_LOC_SECTION_LABEL, 0);
13605 ASM_OUTPUT_LABEL (asm_out_file, loc_section_label);
13606 output_location_lists (die);
13607 have_location_lists = 0;
13610 /* We can only use the low/high_pc attributes if all of the code was
13612 if (separate_line_info_table_in_use == 0)
13614 add_AT_lbl_id (comp_unit_die, DW_AT_low_pc, text_section_label);
13615 add_AT_lbl_id (comp_unit_die, DW_AT_high_pc, text_end_label);
13618 /* If it wasn't, we need to give .debug_loc and .debug_ranges an appropriate
13619 "base address". Use zero so that these addresses become absolute. */
13620 else if (have_location_lists || ranges_table_in_use)
13621 add_AT_addr (comp_unit_die, DW_AT_entry_pc, const0_rtx);
13623 if (debug_info_level >= DINFO_LEVEL_NORMAL)
13624 add_AT_lbl_offset (comp_unit_die, DW_AT_stmt_list,
13625 debug_line_section_label);
13627 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13628 add_AT_lbl_offset (comp_unit_die, DW_AT_macro_info, macinfo_section_label);
13630 /* Output all of the compilation units. We put the main one last so that
13631 the offsets are available to output_pubnames. */
13632 for (node = limbo_die_list; node; node = node->next)
13633 output_comp_unit (node->die, 0);
13635 output_comp_unit (comp_unit_die, 0);
13637 /* Output the abbreviation table. */
13638 named_section_flags (DEBUG_ABBREV_SECTION, SECTION_DEBUG);
13639 output_abbrev_section ();
13641 /* Output public names table if necessary. */
13642 if (pubname_table_in_use)
13644 named_section_flags (DEBUG_PUBNAMES_SECTION, SECTION_DEBUG);
13645 output_pubnames ();
13648 /* Output the address range information. We only put functions in the arange
13649 table, so don't write it out if we don't have any. */
13650 if (fde_table_in_use)
13652 named_section_flags (DEBUG_ARANGES_SECTION, SECTION_DEBUG);
13656 /* Output ranges section if necessary. */
13657 if (ranges_table_in_use)
13659 named_section_flags (DEBUG_RANGES_SECTION, SECTION_DEBUG);
13660 ASM_OUTPUT_LABEL (asm_out_file, ranges_section_label);
13664 /* Have to end the primary source file. */
13665 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
13667 named_section_flags (DEBUG_MACINFO_SECTION, SECTION_DEBUG);
13668 dw2_asm_output_data (1, DW_MACINFO_end_file, "End file");
13669 dw2_asm_output_data (1, 0, "End compilation unit");
13672 /* If we emitted any DW_FORM_strp form attribute, output the string
13674 if (debug_str_hash)
13675 htab_traverse (debug_str_hash, output_indirect_string, NULL);
13679 /* This should never be used, but its address is needed for comparisons. */
13680 const struct gcc_debug_hooks dwarf2_debug_hooks;
13682 #endif /* DWARF2_DEBUGGING_INFO */
13684 #include "gt-dwarf2out.h"