1 /* Output Dwarf format symbol table information from the GNU C compiler.
2 Copyright (C) 1992, 1993, 95-98, 1999 Free Software Foundation, Inc.
3 Contributed by Ron Guilmette (rfg@monkeys.com) of Network Computing Devices.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #ifdef DWARF_DEBUGGING_INFO
30 #include "hard-reg-set.h"
31 #include "insn-config.h"
39 #if defined(DWARF_TIMESTAMPS)
41 extern time_t time PROTO ((time_t *)); /* FIXME: use NEED_DECLARATION_TIME */
42 #endif /* !defined(POSIX) */
43 #endif /* defined(DWARF_TIMESTAMPS) */
45 /* We cannot use <assert.h> in GCC source, since that would include
46 GCC's assert.h, which may not be compatible with the host compiler. */
51 # define assert(e) do { if (! (e)) abort (); } while (0)
54 /* IMPORTANT NOTE: Please see the file README.DWARF for important details
55 regarding the GNU implementation of Dwarf. */
57 /* NOTE: In the comments in this file, many references are made to
58 so called "Debugging Information Entries". For the sake of brevity,
59 this term is abbreviated to `DIE' throughout the remainder of this
62 /* Note that the implementation of C++ support herein is (as yet) unfinished.
63 If you want to try to complete it, more power to you. */
65 /* How to start an assembler comment. */
66 #ifndef ASM_COMMENT_START
67 #define ASM_COMMENT_START ";#"
70 /* How to print out a register name. */
72 #define PRINT_REG(RTX, CODE, FILE) \
73 fprintf ((FILE), "%s", reg_names[REGNO (RTX)])
76 /* Define a macro which returns non-zero for any tagged type which is
77 used (directly or indirectly) in the specification of either some
78 function's return type or some formal parameter of some function.
79 We use this macro when we are operating in "terse" mode to help us
80 know what tagged types have to be represented in Dwarf (even in
81 terse mode) and which ones don't.
83 A flag bit with this meaning really should be a part of the normal
84 GCC ..._TYPE nodes, but at the moment, there is no such bit defined
85 for these nodes. For now, we have to just fake it. It it safe for
86 us to simply return zero for all complete tagged types (which will
87 get forced out anyway if they were used in the specification of some
88 formal or return type) and non-zero for all incomplete tagged types.
91 #define TYPE_USED_FOR_FUNCTION(tagged_type) (TYPE_SIZE (tagged_type) == 0)
93 /* Define a macro which returns non-zero for a TYPE_DECL which was
94 implicitly generated for a tagged type.
96 Note that unlike the gcc front end (which generates a NULL named
97 TYPE_DECL node for each complete tagged type, each array type, and
98 each function type node created) the g++ front end generates a
99 _named_ TYPE_DECL node for each tagged type node created.
100 These TYPE_DECLs have DECL_ARTIFICIAL set, so we know not to
101 generate a DW_TAG_typedef DIE for them. */
102 #define TYPE_DECL_IS_STUB(decl) \
103 (DECL_NAME (decl) == NULL \
104 || (DECL_ARTIFICIAL (decl) \
105 && is_tagged_type (TREE_TYPE (decl)) \
106 && decl == TYPE_STUB_DECL (TREE_TYPE (decl))))
108 extern int flag_traditional;
109 extern char *version_string;
111 /* Maximum size (in bytes) of an artificially generated label. */
113 #define MAX_ARTIFICIAL_LABEL_BYTES 30
115 /* Make sure we know the sizes of the various types dwarf can describe.
116 These are only defaults. If the sizes are different for your target,
117 you should override these values by defining the appropriate symbols
118 in your tm.h file. */
120 #ifndef CHAR_TYPE_SIZE
121 #define CHAR_TYPE_SIZE BITS_PER_UNIT
124 #ifndef SHORT_TYPE_SIZE
125 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * 2)
128 #ifndef INT_TYPE_SIZE
129 #define INT_TYPE_SIZE BITS_PER_WORD
132 #ifndef LONG_TYPE_SIZE
133 #define LONG_TYPE_SIZE BITS_PER_WORD
136 #ifndef LONG_LONG_TYPE_SIZE
137 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
140 #ifndef WCHAR_TYPE_SIZE
141 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
144 #ifndef WCHAR_UNSIGNED
145 #define WCHAR_UNSIGNED 0
148 #ifndef FLOAT_TYPE_SIZE
149 #define FLOAT_TYPE_SIZE BITS_PER_WORD
152 #ifndef DOUBLE_TYPE_SIZE
153 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
156 #ifndef LONG_DOUBLE_TYPE_SIZE
157 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
160 /* Structure to keep track of source filenames. */
162 struct filename_entry {
167 typedef struct filename_entry filename_entry;
169 /* Pointer to an array of elements, each one having the structure above. */
171 static filename_entry *filename_table;
173 /* Total number of entries in the table (i.e. array) pointed to by
174 `filename_table'. This is the *total* and includes both used and
177 static unsigned ft_entries_allocated;
179 /* Number of entries in the filename_table which are actually in use. */
181 static unsigned ft_entries;
183 /* Size (in elements) of increments by which we may expand the filename
184 table. Actually, a single hunk of space of this size should be enough
185 for most typical programs. */
187 #define FT_ENTRIES_INCREMENT 64
189 /* Local pointer to the name of the main input file. Initialized in
192 static char *primary_filename;
194 /* Pointer to the most recent filename for which we produced some line info. */
196 static char *last_filename;
198 /* For Dwarf output, we must assign lexical-blocks id numbers
199 in the order in which their beginnings are encountered.
200 We output Dwarf debugging info that refers to the beginnings
201 and ends of the ranges of code for each lexical block with
202 assembler labels ..Bn and ..Bn.e, where n is the block number.
203 The labels themselves are generated in final.c, which assigns
204 numbers to the blocks in the same way. */
206 static unsigned next_block_number = 2;
208 /* Counter to generate unique names for DIEs. */
210 static unsigned next_unused_dienum = 1;
212 /* Number of the DIE which is currently being generated. */
214 static unsigned current_dienum;
216 /* Number to use for the special "pubname" label on the next DIE which
217 represents a function or data object defined in this compilation
218 unit which has "extern" linkage. */
220 static int next_pubname_number = 0;
222 #define NEXT_DIE_NUM pending_sibling_stack[pending_siblings-1]
224 /* Pointer to a dynamically allocated list of pre-reserved and still
225 pending sibling DIE numbers. Note that this list will grow as needed. */
227 static unsigned *pending_sibling_stack;
229 /* Counter to keep track of the number of pre-reserved and still pending
230 sibling DIE numbers. */
232 static unsigned pending_siblings;
234 /* The currently allocated size of the above list (expressed in number of
237 static unsigned pending_siblings_allocated;
239 /* Size (in elements) of increments by which we may expand the pending
240 sibling stack. Actually, a single hunk of space of this size should
241 be enough for most typical programs. */
243 #define PENDING_SIBLINGS_INCREMENT 64
245 /* Non-zero if we are performing our file-scope finalization pass and if
246 we should force out Dwarf descriptions of any and all file-scope
247 tagged types which are still incomplete types. */
249 static int finalizing = 0;
251 /* A pointer to the base of a list of pending types which we haven't
252 generated DIEs for yet, but which we will have to come back to
255 static tree *pending_types_list;
257 /* Number of elements currently allocated for the pending_types_list. */
259 static unsigned pending_types_allocated;
261 /* Number of elements of pending_types_list currently in use. */
263 static unsigned pending_types;
265 /* Size (in elements) of increments by which we may expand the pending
266 types list. Actually, a single hunk of space of this size should
267 be enough for most typical programs. */
269 #define PENDING_TYPES_INCREMENT 64
271 /* A pointer to the base of a list of incomplete types which might be
272 completed at some later time. */
274 static tree *incomplete_types_list;
276 /* Number of elements currently allocated for the incomplete_types_list. */
277 static unsigned incomplete_types_allocated;
279 /* Number of elements of incomplete_types_list currently in use. */
280 static unsigned incomplete_types;
282 /* Size (in elements) of increments by which we may expand the incomplete
283 types list. Actually, a single hunk of space of this size should
284 be enough for most typical programs. */
285 #define INCOMPLETE_TYPES_INCREMENT 64
287 /* Pointer to an artificial RECORD_TYPE which we create in dwarfout_init.
288 This is used in a hack to help us get the DIEs describing types of
289 formal parameters to come *after* all of the DIEs describing the formal
290 parameters themselves. That's necessary in order to be compatible
291 with what the brain-damaged svr4 SDB debugger requires. */
293 static tree fake_containing_scope;
295 /* The number of the current function definition that we are generating
296 debugging information for. These numbers range from 1 up to the maximum
297 number of function definitions contained within the current compilation
298 unit. These numbers are used to create unique labels for various things
299 contained within various function definitions. */
301 static unsigned current_funcdef_number = 1;
303 /* A pointer to the ..._DECL node which we have most recently been working
304 on. We keep this around just in case something about it looks screwy
305 and we want to tell the user what the source coordinates for the actual
308 static tree dwarf_last_decl;
310 /* A flag indicating that we are emitting the member declarations of a
311 class, so member functions and variables should not be entirely emitted.
312 This is a kludge to avoid passing a second argument to output_*_die. */
316 /* Forward declarations for functions defined in this file. */
318 static const char *dwarf_tag_name PROTO((unsigned));
319 static const char *dwarf_attr_name PROTO((unsigned));
320 static const char *dwarf_stack_op_name PROTO((unsigned));
321 static const char *dwarf_typemod_name PROTO((unsigned));
322 static const char *dwarf_fmt_byte_name PROTO((unsigned));
323 static const char *dwarf_fund_type_name PROTO((unsigned));
324 static tree decl_ultimate_origin PROTO((tree));
325 static tree block_ultimate_origin PROTO((tree));
326 static tree decl_class_context PROTO((tree));
328 static void output_unsigned_leb128 PROTO((unsigned long));
329 static void output_signed_leb128 PROTO((long));
331 static inline int is_body_block PROTO((tree));
332 static int fundamental_type_code PROTO((tree));
333 static tree root_type_1 PROTO((tree, int));
334 static tree root_type PROTO((tree));
335 static void write_modifier_bytes_1 PROTO((tree, int, int, int));
336 static void write_modifier_bytes PROTO((tree, int, int));
337 static inline int type_is_fundamental PROTO((tree));
338 static void equate_decl_number_to_die_number PROTO((tree));
339 static inline void equate_type_number_to_die_number PROTO((tree));
340 static void output_reg_number PROTO((rtx));
341 static void output_mem_loc_descriptor PROTO((rtx));
342 static void output_loc_descriptor PROTO((rtx));
343 static void output_bound_representation PROTO((tree, unsigned, int));
344 static void output_enumeral_list PROTO((tree));
345 static inline unsigned ceiling PROTO((unsigned, unsigned));
346 static inline tree field_type PROTO((tree));
347 static inline unsigned simple_type_align_in_bits PROTO((tree));
348 static inline unsigned simple_type_size_in_bits PROTO((tree));
349 static unsigned field_byte_offset PROTO((tree));
350 static inline void sibling_attribute PROTO((void));
351 static void location_attribute PROTO((rtx));
352 static void data_member_location_attribute PROTO((tree));
353 static void const_value_attribute PROTO((rtx));
354 static void location_or_const_value_attribute PROTO((tree));
355 static inline void name_attribute PROTO((const char *));
356 static inline void fund_type_attribute PROTO((unsigned));
357 static void mod_fund_type_attribute PROTO((tree, int, int));
358 static inline void user_def_type_attribute PROTO((tree));
359 static void mod_u_d_type_attribute PROTO((tree, int, int));
360 #ifdef USE_ORDERING_ATTRIBUTE
361 static inline void ordering_attribute PROTO((unsigned));
362 #endif /* defined(USE_ORDERING_ATTRIBUTE) */
363 static void subscript_data_attribute PROTO((tree));
364 static void byte_size_attribute PROTO((tree));
365 static inline void bit_offset_attribute PROTO((tree));
366 static inline void bit_size_attribute PROTO((tree));
367 static inline void element_list_attribute PROTO((tree));
368 static inline void stmt_list_attribute PROTO((const char *));
369 static inline void low_pc_attribute PROTO((const char *));
370 static inline void high_pc_attribute PROTO((const char *));
371 static inline void body_begin_attribute PROTO((const char *));
372 static inline void body_end_attribute PROTO((const char *));
373 static inline void language_attribute PROTO((unsigned));
374 static inline void member_attribute PROTO((tree));
376 static inline void string_length_attribute PROTO((tree));
378 static inline void comp_dir_attribute PROTO((const char *));
379 static inline void sf_names_attribute PROTO((const char *));
380 static inline void src_info_attribute PROTO((const char *));
381 static inline void mac_info_attribute PROTO((const char *));
382 static inline void prototyped_attribute PROTO((tree));
383 static inline void producer_attribute PROTO((const char *));
384 static inline void inline_attribute PROTO((tree));
385 static inline void containing_type_attribute PROTO((tree));
386 static inline void abstract_origin_attribute PROTO((tree));
387 #ifdef DWARF_DECL_COORDINATES
388 static inline void src_coords_attribute PROTO((unsigned, unsigned));
389 #endif /* defined(DWARF_DECL_COORDINATES) */
390 static inline void pure_or_virtual_attribute PROTO((tree));
391 static void name_and_src_coords_attributes PROTO((tree));
392 static void type_attribute PROTO((tree, int, int));
393 static char *type_tag PROTO((tree));
394 static inline void dienum_push PROTO((void));
395 static inline void dienum_pop PROTO((void));
396 static inline tree member_declared_type PROTO((tree));
397 static char *function_start_label PROTO((tree));
398 static void output_array_type_die PROTO((void *));
399 static void output_set_type_die PROTO((void *));
401 static void output_entry_point_die PROTO((void *));
403 static void output_inlined_enumeration_type_die PROTO((void *));
404 static void output_inlined_structure_type_die PROTO((void *));
405 static void output_inlined_union_type_die PROTO((void *));
406 static void output_enumeration_type_die PROTO((void *));
407 static void output_formal_parameter_die PROTO((void *));
408 static void output_global_subroutine_die PROTO((void *));
409 static void output_global_variable_die PROTO((void *));
410 static void output_label_die PROTO((void *));
411 static void output_lexical_block_die PROTO((void *));
412 static void output_inlined_subroutine_die PROTO((void *));
413 static void output_local_variable_die PROTO((void *));
414 static void output_member_die PROTO((void *));
416 static void output_pointer_type_die PROTO((void *));
417 static void output_reference_type_die PROTO((void *));
419 static void output_ptr_to_mbr_type_die PROTO((void *));
420 static void output_compile_unit_die PROTO((void *));
421 static void output_string_type_die PROTO((void *));
422 static void output_inheritance_die PROTO((void *));
423 static void output_structure_type_die PROTO((void *));
424 static void output_local_subroutine_die PROTO((void *));
425 static void output_subroutine_type_die PROTO((void *));
426 static void output_typedef_die PROTO((void *));
427 static void output_union_type_die PROTO((void *));
428 static void output_unspecified_parameters_die PROTO((void *));
429 static void output_padded_null_die PROTO((void *));
430 static void output_die PROTO((void (*) PROTO((void *)), void *));
431 static void end_sibling_chain PROTO((void));
432 static void output_formal_types PROTO((tree));
433 static void pend_type PROTO((tree));
434 static int type_ok_for_scope PROTO((tree, tree));
435 static void output_pending_types_for_scope PROTO((tree));
436 static void output_type PROTO((tree, tree));
437 static void output_tagged_type_instantiation PROTO((tree));
438 static void output_block PROTO((tree, int));
439 static void output_decls_for_scope PROTO((tree, int));
440 static void output_decl PROTO((tree, tree));
441 static void shuffle_filename_entry PROTO((filename_entry *));
442 static void generate_new_sfname_entry PROTO((void));
443 static unsigned lookup_filename PROTO((const char *));
444 static void generate_srcinfo_entry PROTO((unsigned, unsigned));
445 static void generate_macinfo_entry PROTO((const char *, const char *));
446 static int is_pseudo_reg PROTO((rtx));
447 static tree type_main_variant PROTO((tree));
448 static int is_tagged_type PROTO((tree));
449 static int is_redundant_typedef PROTO((tree));
450 static void add_incomplete_type PROTO((tree));
451 static void retry_incomplete_types PROTO((void));
453 /* Definitions of defaults for assembler-dependent names of various
454 pseudo-ops and section names.
456 Theses may be overridden in your tm.h file (if necessary) for your
457 particular assembler. The default values provided here correspond to
458 what is expected by "standard" AT&T System V.4 assemblers. */
461 #define FILE_ASM_OP ".file"
463 #ifndef VERSION_ASM_OP
464 #define VERSION_ASM_OP ".version"
466 #ifndef UNALIGNED_SHORT_ASM_OP
467 #define UNALIGNED_SHORT_ASM_OP ".2byte"
469 #ifndef UNALIGNED_INT_ASM_OP
470 #define UNALIGNED_INT_ASM_OP ".4byte"
473 #define ASM_BYTE_OP ".byte"
476 #define SET_ASM_OP ".set"
479 /* Pseudo-ops for pushing the current section onto the section stack (and
480 simultaneously changing to a new section) and for poping back to the
481 section we were in immediately before this one. Note that most svr4
482 assemblers only maintain a one level stack... you can push all the
483 sections you want, but you can only pop out one level. (The sparc
484 svr4 assembler is an exception to this general rule.) That's
485 OK because we only use at most one level of the section stack herein. */
487 #ifndef PUSHSECTION_ASM_OP
488 #define PUSHSECTION_ASM_OP ".section"
490 #ifndef POPSECTION_ASM_OP
491 #define POPSECTION_ASM_OP ".previous"
494 /* The default format used by the ASM_OUTPUT_PUSH_SECTION macro (see below)
495 to print the PUSHSECTION_ASM_OP and the section name. The default here
496 works for almost all svr4 assemblers, except for the sparc, where the
497 section name must be enclosed in double quotes. (See sparcv4.h.) */
499 #ifndef PUSHSECTION_FORMAT
500 #define PUSHSECTION_FORMAT "\t%s\t%s\n"
503 #ifndef DEBUG_SECTION
504 #define DEBUG_SECTION ".debug"
507 #define LINE_SECTION ".line"
509 #ifndef SFNAMES_SECTION
510 #define SFNAMES_SECTION ".debug_sfnames"
512 #ifndef SRCINFO_SECTION
513 #define SRCINFO_SECTION ".debug_srcinfo"
515 #ifndef MACINFO_SECTION
516 #define MACINFO_SECTION ".debug_macinfo"
518 #ifndef PUBNAMES_SECTION
519 #define PUBNAMES_SECTION ".debug_pubnames"
521 #ifndef ARANGES_SECTION
522 #define ARANGES_SECTION ".debug_aranges"
525 #define TEXT_SECTION ".text"
528 #define DATA_SECTION ".data"
530 #ifndef DATA1_SECTION
531 #define DATA1_SECTION ".data1"
533 #ifndef RODATA_SECTION
534 #define RODATA_SECTION ".rodata"
536 #ifndef RODATA1_SECTION
537 #define RODATA1_SECTION ".rodata1"
540 #define BSS_SECTION ".bss"
543 /* Definitions of defaults for formats and names of various special
544 (artificial) labels which may be generated within this file (when
545 the -g options is used and DWARF_DEBUGGING_INFO is in effect.
547 If necessary, these may be overridden from within your tm.h file,
548 but typically, you should never need to override these.
550 These labels have been hacked (temporarily) so that they all begin with
551 a `.L' sequence so as to appease the stock sparc/svr4 assembler and the
552 stock m88k/svr4 assembler, both of which need to see .L at the start of
553 a label in order to prevent that label from going into the linker symbol
554 table). When I get time, I'll have to fix this the right way so that we
555 will use ASM_GENERATE_INTERNAL_LABEL and ASM_OUTPUT_INTERNAL_LABEL herein,
556 but that will require a rather massive set of changes. For the moment,
557 the following definitions out to produce the right results for all svr4
558 and svr3 assemblers. -- rfg
561 #ifndef TEXT_BEGIN_LABEL
562 #define TEXT_BEGIN_LABEL "*.L_text_b"
564 #ifndef TEXT_END_LABEL
565 #define TEXT_END_LABEL "*.L_text_e"
568 #ifndef DATA_BEGIN_LABEL
569 #define DATA_BEGIN_LABEL "*.L_data_b"
571 #ifndef DATA_END_LABEL
572 #define DATA_END_LABEL "*.L_data_e"
575 #ifndef DATA1_BEGIN_LABEL
576 #define DATA1_BEGIN_LABEL "*.L_data1_b"
578 #ifndef DATA1_END_LABEL
579 #define DATA1_END_LABEL "*.L_data1_e"
582 #ifndef RODATA_BEGIN_LABEL
583 #define RODATA_BEGIN_LABEL "*.L_rodata_b"
585 #ifndef RODATA_END_LABEL
586 #define RODATA_END_LABEL "*.L_rodata_e"
589 #ifndef RODATA1_BEGIN_LABEL
590 #define RODATA1_BEGIN_LABEL "*.L_rodata1_b"
592 #ifndef RODATA1_END_LABEL
593 #define RODATA1_END_LABEL "*.L_rodata1_e"
596 #ifndef BSS_BEGIN_LABEL
597 #define BSS_BEGIN_LABEL "*.L_bss_b"
599 #ifndef BSS_END_LABEL
600 #define BSS_END_LABEL "*.L_bss_e"
603 #ifndef LINE_BEGIN_LABEL
604 #define LINE_BEGIN_LABEL "*.L_line_b"
606 #ifndef LINE_LAST_ENTRY_LABEL
607 #define LINE_LAST_ENTRY_LABEL "*.L_line_last"
609 #ifndef LINE_END_LABEL
610 #define LINE_END_LABEL "*.L_line_e"
613 #ifndef DEBUG_BEGIN_LABEL
614 #define DEBUG_BEGIN_LABEL "*.L_debug_b"
616 #ifndef SFNAMES_BEGIN_LABEL
617 #define SFNAMES_BEGIN_LABEL "*.L_sfnames_b"
619 #ifndef SRCINFO_BEGIN_LABEL
620 #define SRCINFO_BEGIN_LABEL "*.L_srcinfo_b"
622 #ifndef MACINFO_BEGIN_LABEL
623 #define MACINFO_BEGIN_LABEL "*.L_macinfo_b"
626 #ifndef DIE_BEGIN_LABEL_FMT
627 #define DIE_BEGIN_LABEL_FMT "*.L_D%u"
629 #ifndef DIE_END_LABEL_FMT
630 #define DIE_END_LABEL_FMT "*.L_D%u_e"
632 #ifndef PUB_DIE_LABEL_FMT
633 #define PUB_DIE_LABEL_FMT "*.L_P%u"
635 #ifndef INSN_LABEL_FMT
636 #define INSN_LABEL_FMT "*.L_I%u_%u"
638 #ifndef BLOCK_BEGIN_LABEL_FMT
639 #define BLOCK_BEGIN_LABEL_FMT "*.L_B%u"
641 #ifndef BLOCK_END_LABEL_FMT
642 #define BLOCK_END_LABEL_FMT "*.L_B%u_e"
644 #ifndef SS_BEGIN_LABEL_FMT
645 #define SS_BEGIN_LABEL_FMT "*.L_s%u"
647 #ifndef SS_END_LABEL_FMT
648 #define SS_END_LABEL_FMT "*.L_s%u_e"
650 #ifndef EE_BEGIN_LABEL_FMT
651 #define EE_BEGIN_LABEL_FMT "*.L_e%u"
653 #ifndef EE_END_LABEL_FMT
654 #define EE_END_LABEL_FMT "*.L_e%u_e"
656 #ifndef MT_BEGIN_LABEL_FMT
657 #define MT_BEGIN_LABEL_FMT "*.L_t%u"
659 #ifndef MT_END_LABEL_FMT
660 #define MT_END_LABEL_FMT "*.L_t%u_e"
662 #ifndef LOC_BEGIN_LABEL_FMT
663 #define LOC_BEGIN_LABEL_FMT "*.L_l%u"
665 #ifndef LOC_END_LABEL_FMT
666 #define LOC_END_LABEL_FMT "*.L_l%u_e"
668 #ifndef BOUND_BEGIN_LABEL_FMT
669 #define BOUND_BEGIN_LABEL_FMT "*.L_b%u_%u_%c"
671 #ifndef BOUND_END_LABEL_FMT
672 #define BOUND_END_LABEL_FMT "*.L_b%u_%u_%c_e"
674 #ifndef DERIV_BEGIN_LABEL_FMT
675 #define DERIV_BEGIN_LABEL_FMT "*.L_d%u"
677 #ifndef DERIV_END_LABEL_FMT
678 #define DERIV_END_LABEL_FMT "*.L_d%u_e"
680 #ifndef SL_BEGIN_LABEL_FMT
681 #define SL_BEGIN_LABEL_FMT "*.L_sl%u"
683 #ifndef SL_END_LABEL_FMT
684 #define SL_END_LABEL_FMT "*.L_sl%u_e"
686 #ifndef BODY_BEGIN_LABEL_FMT
687 #define BODY_BEGIN_LABEL_FMT "*.L_b%u"
689 #ifndef BODY_END_LABEL_FMT
690 #define BODY_END_LABEL_FMT "*.L_b%u_e"
692 #ifndef FUNC_END_LABEL_FMT
693 #define FUNC_END_LABEL_FMT "*.L_f%u_e"
695 #ifndef TYPE_NAME_FMT
696 #define TYPE_NAME_FMT "*.L_T%u"
698 #ifndef DECL_NAME_FMT
699 #define DECL_NAME_FMT "*.L_E%u"
701 #ifndef LINE_CODE_LABEL_FMT
702 #define LINE_CODE_LABEL_FMT "*.L_LC%u"
704 #ifndef SFNAMES_ENTRY_LABEL_FMT
705 #define SFNAMES_ENTRY_LABEL_FMT "*.L_F%u"
707 #ifndef LINE_ENTRY_LABEL_FMT
708 #define LINE_ENTRY_LABEL_FMT "*.L_LE%u"
711 /* Definitions of defaults for various types of primitive assembly language
714 If necessary, these may be overridden from within your tm.h file,
715 but typically, you shouldn't need to override these. */
717 #ifndef ASM_OUTPUT_PUSH_SECTION
718 #define ASM_OUTPUT_PUSH_SECTION(FILE, SECTION) \
719 fprintf ((FILE), PUSHSECTION_FORMAT, PUSHSECTION_ASM_OP, SECTION)
722 #ifndef ASM_OUTPUT_POP_SECTION
723 #define ASM_OUTPUT_POP_SECTION(FILE) \
724 fprintf ((FILE), "\t%s\n", POPSECTION_ASM_OP)
727 #ifndef ASM_OUTPUT_DWARF_DELTA2
728 #define ASM_OUTPUT_DWARF_DELTA2(FILE,LABEL1,LABEL2) \
729 do { fprintf ((FILE), "\t%s\t", UNALIGNED_SHORT_ASM_OP); \
730 assemble_name (FILE, LABEL1); \
731 fprintf (FILE, "-"); \
732 assemble_name (FILE, LABEL2); \
733 fprintf (FILE, "\n"); \
737 #ifndef ASM_OUTPUT_DWARF_DELTA4
738 #define ASM_OUTPUT_DWARF_DELTA4(FILE,LABEL1,LABEL2) \
739 do { fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
740 assemble_name (FILE, LABEL1); \
741 fprintf (FILE, "-"); \
742 assemble_name (FILE, LABEL2); \
743 fprintf (FILE, "\n"); \
747 #ifndef ASM_OUTPUT_DWARF_TAG
748 #define ASM_OUTPUT_DWARF_TAG(FILE,TAG) \
750 fprintf ((FILE), "\t%s\t0x%x", \
751 UNALIGNED_SHORT_ASM_OP, (unsigned) TAG); \
752 if (flag_debug_asm) \
753 fprintf ((FILE), "\t%s %s", \
754 ASM_COMMENT_START, dwarf_tag_name (TAG)); \
755 fputc ('\n', (FILE)); \
759 #ifndef ASM_OUTPUT_DWARF_ATTRIBUTE
760 #define ASM_OUTPUT_DWARF_ATTRIBUTE(FILE,ATTR) \
762 fprintf ((FILE), "\t%s\t0x%x", \
763 UNALIGNED_SHORT_ASM_OP, (unsigned) ATTR); \
764 if (flag_debug_asm) \
765 fprintf ((FILE), "\t%s %s", \
766 ASM_COMMENT_START, dwarf_attr_name (ATTR)); \
767 fputc ('\n', (FILE)); \
771 #ifndef ASM_OUTPUT_DWARF_STACK_OP
772 #define ASM_OUTPUT_DWARF_STACK_OP(FILE,OP) \
774 fprintf ((FILE), "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) OP); \
775 if (flag_debug_asm) \
776 fprintf ((FILE), "\t%s %s", \
777 ASM_COMMENT_START, dwarf_stack_op_name (OP)); \
778 fputc ('\n', (FILE)); \
782 #ifndef ASM_OUTPUT_DWARF_FUND_TYPE
783 #define ASM_OUTPUT_DWARF_FUND_TYPE(FILE,FT) \
785 fprintf ((FILE), "\t%s\t0x%x", \
786 UNALIGNED_SHORT_ASM_OP, (unsigned) FT); \
787 if (flag_debug_asm) \
788 fprintf ((FILE), "\t%s %s", \
789 ASM_COMMENT_START, dwarf_fund_type_name (FT)); \
790 fputc ('\n', (FILE)); \
794 #ifndef ASM_OUTPUT_DWARF_FMT_BYTE
795 #define ASM_OUTPUT_DWARF_FMT_BYTE(FILE,FMT) \
797 fprintf ((FILE), "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) FMT); \
798 if (flag_debug_asm) \
799 fprintf ((FILE), "\t%s %s", \
800 ASM_COMMENT_START, dwarf_fmt_byte_name (FMT)); \
801 fputc ('\n', (FILE)); \
805 #ifndef ASM_OUTPUT_DWARF_TYPE_MODIFIER
806 #define ASM_OUTPUT_DWARF_TYPE_MODIFIER(FILE,MOD) \
808 fprintf ((FILE), "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) MOD); \
809 if (flag_debug_asm) \
810 fprintf ((FILE), "\t%s %s", \
811 ASM_COMMENT_START, dwarf_typemod_name (MOD)); \
812 fputc ('\n', (FILE)); \
816 #ifndef ASM_OUTPUT_DWARF_ADDR
817 #define ASM_OUTPUT_DWARF_ADDR(FILE,LABEL) \
818 do { fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
819 assemble_name (FILE, LABEL); \
820 fprintf (FILE, "\n"); \
824 #ifndef ASM_OUTPUT_DWARF_ADDR_CONST
825 #define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX) \
827 fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
828 output_addr_const ((FILE), (RTX)); \
829 fputc ('\n', (FILE)); \
833 #ifndef ASM_OUTPUT_DWARF_REF
834 #define ASM_OUTPUT_DWARF_REF(FILE,LABEL) \
835 do { fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
836 assemble_name (FILE, LABEL); \
837 fprintf (FILE, "\n"); \
841 #ifndef ASM_OUTPUT_DWARF_DATA1
842 #define ASM_OUTPUT_DWARF_DATA1(FILE,VALUE) \
843 fprintf ((FILE), "\t%s\t0x%x\n", ASM_BYTE_OP, VALUE)
846 #ifndef ASM_OUTPUT_DWARF_DATA2
847 #define ASM_OUTPUT_DWARF_DATA2(FILE,VALUE) \
848 fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_SHORT_ASM_OP, (unsigned) VALUE)
851 #ifndef ASM_OUTPUT_DWARF_DATA4
852 #define ASM_OUTPUT_DWARF_DATA4(FILE,VALUE) \
853 fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, (unsigned) VALUE)
856 #ifndef ASM_OUTPUT_DWARF_DATA8
857 #define ASM_OUTPUT_DWARF_DATA8(FILE,HIGH_VALUE,LOW_VALUE) \
859 if (WORDS_BIG_ENDIAN) \
861 fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \
862 fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE);\
866 fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE);\
867 fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \
872 /* ASM_OUTPUT_DWARF_STRING is defined to output an ascii string, but to
873 NOT issue a trailing newline. We define ASM_OUTPUT_DWARF_STRING_NEWLINE
874 based on whether ASM_OUTPUT_DWARF_STRING is defined or not. If it is
875 defined, we call it, then issue the line feed. If not, we supply a
876 default defintion of calling ASM_OUTPUT_ASCII */
878 #ifndef ASM_OUTPUT_DWARF_STRING
879 #define ASM_OUTPUT_DWARF_STRING_NEWLINE(FILE,P) \
880 ASM_OUTPUT_ASCII ((FILE), P, strlen (P)+1)
882 #define ASM_OUTPUT_DWARF_STRING_NEWLINE(FILE,P) \
883 ASM_OUTPUT_DWARF_STRING (FILE,P), ASM_OUTPUT_DWARF_STRING (FILE,"\n")
887 /************************ general utility functions **************************/
893 return (((GET_CODE (rtl) == REG) && (REGNO (rtl) >= FIRST_PSEUDO_REGISTER))
894 || ((GET_CODE (rtl) == SUBREG)
895 && (REGNO (XEXP (rtl, 0)) >= FIRST_PSEUDO_REGISTER)));
899 type_main_variant (type)
902 type = TYPE_MAIN_VARIANT (type);
904 /* There really should be only one main variant among any group of variants
905 of a given type (and all of the MAIN_VARIANT values for all members of
906 the group should point to that one type) but sometimes the C front-end
907 messes this up for array types, so we work around that bug here. */
909 if (TREE_CODE (type) == ARRAY_TYPE)
911 while (type != TYPE_MAIN_VARIANT (type))
912 type = TYPE_MAIN_VARIANT (type);
918 /* Return non-zero if the given type node represents a tagged type. */
921 is_tagged_type (type)
924 register enum tree_code code = TREE_CODE (type);
926 return (code == RECORD_TYPE || code == UNION_TYPE
927 || code == QUAL_UNION_TYPE || code == ENUMERAL_TYPE);
932 register unsigned tag;
936 case TAG_padding: return "TAG_padding";
937 case TAG_array_type: return "TAG_array_type";
938 case TAG_class_type: return "TAG_class_type";
939 case TAG_entry_point: return "TAG_entry_point";
940 case TAG_enumeration_type: return "TAG_enumeration_type";
941 case TAG_formal_parameter: return "TAG_formal_parameter";
942 case TAG_global_subroutine: return "TAG_global_subroutine";
943 case TAG_global_variable: return "TAG_global_variable";
944 case TAG_label: return "TAG_label";
945 case TAG_lexical_block: return "TAG_lexical_block";
946 case TAG_local_variable: return "TAG_local_variable";
947 case TAG_member: return "TAG_member";
948 case TAG_pointer_type: return "TAG_pointer_type";
949 case TAG_reference_type: return "TAG_reference_type";
950 case TAG_compile_unit: return "TAG_compile_unit";
951 case TAG_string_type: return "TAG_string_type";
952 case TAG_structure_type: return "TAG_structure_type";
953 case TAG_subroutine: return "TAG_subroutine";
954 case TAG_subroutine_type: return "TAG_subroutine_type";
955 case TAG_typedef: return "TAG_typedef";
956 case TAG_union_type: return "TAG_union_type";
957 case TAG_unspecified_parameters: return "TAG_unspecified_parameters";
958 case TAG_variant: return "TAG_variant";
959 case TAG_common_block: return "TAG_common_block";
960 case TAG_common_inclusion: return "TAG_common_inclusion";
961 case TAG_inheritance: return "TAG_inheritance";
962 case TAG_inlined_subroutine: return "TAG_inlined_subroutine";
963 case TAG_module: return "TAG_module";
964 case TAG_ptr_to_member_type: return "TAG_ptr_to_member_type";
965 case TAG_set_type: return "TAG_set_type";
966 case TAG_subrange_type: return "TAG_subrange_type";
967 case TAG_with_stmt: return "TAG_with_stmt";
969 /* GNU extensions. */
971 case TAG_format_label: return "TAG_format_label";
972 case TAG_namelist: return "TAG_namelist";
973 case TAG_function_template: return "TAG_function_template";
974 case TAG_class_template: return "TAG_class_template";
976 default: return "TAG_<unknown>";
981 dwarf_attr_name (attr)
982 register unsigned attr;
986 case AT_sibling: return "AT_sibling";
987 case AT_location: return "AT_location";
988 case AT_name: return "AT_name";
989 case AT_fund_type: return "AT_fund_type";
990 case AT_mod_fund_type: return "AT_mod_fund_type";
991 case AT_user_def_type: return "AT_user_def_type";
992 case AT_mod_u_d_type: return "AT_mod_u_d_type";
993 case AT_ordering: return "AT_ordering";
994 case AT_subscr_data: return "AT_subscr_data";
995 case AT_byte_size: return "AT_byte_size";
996 case AT_bit_offset: return "AT_bit_offset";
997 case AT_bit_size: return "AT_bit_size";
998 case AT_element_list: return "AT_element_list";
999 case AT_stmt_list: return "AT_stmt_list";
1000 case AT_low_pc: return "AT_low_pc";
1001 case AT_high_pc: return "AT_high_pc";
1002 case AT_language: return "AT_language";
1003 case AT_member: return "AT_member";
1004 case AT_discr: return "AT_discr";
1005 case AT_discr_value: return "AT_discr_value";
1006 case AT_string_length: return "AT_string_length";
1007 case AT_common_reference: return "AT_common_reference";
1008 case AT_comp_dir: return "AT_comp_dir";
1009 case AT_const_value_string: return "AT_const_value_string";
1010 case AT_const_value_data2: return "AT_const_value_data2";
1011 case AT_const_value_data4: return "AT_const_value_data4";
1012 case AT_const_value_data8: return "AT_const_value_data8";
1013 case AT_const_value_block2: return "AT_const_value_block2";
1014 case AT_const_value_block4: return "AT_const_value_block4";
1015 case AT_containing_type: return "AT_containing_type";
1016 case AT_default_value_addr: return "AT_default_value_addr";
1017 case AT_default_value_data2: return "AT_default_value_data2";
1018 case AT_default_value_data4: return "AT_default_value_data4";
1019 case AT_default_value_data8: return "AT_default_value_data8";
1020 case AT_default_value_string: return "AT_default_value_string";
1021 case AT_friends: return "AT_friends";
1022 case AT_inline: return "AT_inline";
1023 case AT_is_optional: return "AT_is_optional";
1024 case AT_lower_bound_ref: return "AT_lower_bound_ref";
1025 case AT_lower_bound_data2: return "AT_lower_bound_data2";
1026 case AT_lower_bound_data4: return "AT_lower_bound_data4";
1027 case AT_lower_bound_data8: return "AT_lower_bound_data8";
1028 case AT_private: return "AT_private";
1029 case AT_producer: return "AT_producer";
1030 case AT_program: return "AT_program";
1031 case AT_protected: return "AT_protected";
1032 case AT_prototyped: return "AT_prototyped";
1033 case AT_public: return "AT_public";
1034 case AT_pure_virtual: return "AT_pure_virtual";
1035 case AT_return_addr: return "AT_return_addr";
1036 case AT_abstract_origin: return "AT_abstract_origin";
1037 case AT_start_scope: return "AT_start_scope";
1038 case AT_stride_size: return "AT_stride_size";
1039 case AT_upper_bound_ref: return "AT_upper_bound_ref";
1040 case AT_upper_bound_data2: return "AT_upper_bound_data2";
1041 case AT_upper_bound_data4: return "AT_upper_bound_data4";
1042 case AT_upper_bound_data8: return "AT_upper_bound_data8";
1043 case AT_virtual: return "AT_virtual";
1045 /* GNU extensions */
1047 case AT_sf_names: return "AT_sf_names";
1048 case AT_src_info: return "AT_src_info";
1049 case AT_mac_info: return "AT_mac_info";
1050 case AT_src_coords: return "AT_src_coords";
1051 case AT_body_begin: return "AT_body_begin";
1052 case AT_body_end: return "AT_body_end";
1054 default: return "AT_<unknown>";
1059 dwarf_stack_op_name (op)
1060 register unsigned op;
1064 case OP_REG: return "OP_REG";
1065 case OP_BASEREG: return "OP_BASEREG";
1066 case OP_ADDR: return "OP_ADDR";
1067 case OP_CONST: return "OP_CONST";
1068 case OP_DEREF2: return "OP_DEREF2";
1069 case OP_DEREF4: return "OP_DEREF4";
1070 case OP_ADD: return "OP_ADD";
1071 default: return "OP_<unknown>";
1076 dwarf_typemod_name (mod)
1077 register unsigned mod;
1081 case MOD_pointer_to: return "MOD_pointer_to";
1082 case MOD_reference_to: return "MOD_reference_to";
1083 case MOD_const: return "MOD_const";
1084 case MOD_volatile: return "MOD_volatile";
1085 default: return "MOD_<unknown>";
1090 dwarf_fmt_byte_name (fmt)
1091 register unsigned fmt;
1095 case FMT_FT_C_C: return "FMT_FT_C_C";
1096 case FMT_FT_C_X: return "FMT_FT_C_X";
1097 case FMT_FT_X_C: return "FMT_FT_X_C";
1098 case FMT_FT_X_X: return "FMT_FT_X_X";
1099 case FMT_UT_C_C: return "FMT_UT_C_C";
1100 case FMT_UT_C_X: return "FMT_UT_C_X";
1101 case FMT_UT_X_C: return "FMT_UT_X_C";
1102 case FMT_UT_X_X: return "FMT_UT_X_X";
1103 case FMT_ET: return "FMT_ET";
1104 default: return "FMT_<unknown>";
1109 dwarf_fund_type_name (ft)
1110 register unsigned ft;
1114 case FT_char: return "FT_char";
1115 case FT_signed_char: return "FT_signed_char";
1116 case FT_unsigned_char: return "FT_unsigned_char";
1117 case FT_short: return "FT_short";
1118 case FT_signed_short: return "FT_signed_short";
1119 case FT_unsigned_short: return "FT_unsigned_short";
1120 case FT_integer: return "FT_integer";
1121 case FT_signed_integer: return "FT_signed_integer";
1122 case FT_unsigned_integer: return "FT_unsigned_integer";
1123 case FT_long: return "FT_long";
1124 case FT_signed_long: return "FT_signed_long";
1125 case FT_unsigned_long: return "FT_unsigned_long";
1126 case FT_pointer: return "FT_pointer";
1127 case FT_float: return "FT_float";
1128 case FT_dbl_prec_float: return "FT_dbl_prec_float";
1129 case FT_ext_prec_float: return "FT_ext_prec_float";
1130 case FT_complex: return "FT_complex";
1131 case FT_dbl_prec_complex: return "FT_dbl_prec_complex";
1132 case FT_void: return "FT_void";
1133 case FT_boolean: return "FT_boolean";
1134 case FT_ext_prec_complex: return "FT_ext_prec_complex";
1135 case FT_label: return "FT_label";
1137 /* GNU extensions. */
1139 case FT_long_long: return "FT_long_long";
1140 case FT_signed_long_long: return "FT_signed_long_long";
1141 case FT_unsigned_long_long: return "FT_unsigned_long_long";
1143 case FT_int8: return "FT_int8";
1144 case FT_signed_int8: return "FT_signed_int8";
1145 case FT_unsigned_int8: return "FT_unsigned_int8";
1146 case FT_int16: return "FT_int16";
1147 case FT_signed_int16: return "FT_signed_int16";
1148 case FT_unsigned_int16: return "FT_unsigned_int16";
1149 case FT_int32: return "FT_int32";
1150 case FT_signed_int32: return "FT_signed_int32";
1151 case FT_unsigned_int32: return "FT_unsigned_int32";
1152 case FT_int64: return "FT_int64";
1153 case FT_signed_int64: return "FT_signed_int64";
1154 case FT_unsigned_int64: return "FT_unsigned_int64";
1156 case FT_real32: return "FT_real32";
1157 case FT_real64: return "FT_real64";
1158 case FT_real96: return "FT_real96";
1159 case FT_real128: return "FT_real128";
1161 default: return "FT_<unknown>";
1165 /* Determine the "ultimate origin" of a decl. The decl may be an
1166 inlined instance of an inlined instance of a decl which is local
1167 to an inline function, so we have to trace all of the way back
1168 through the origin chain to find out what sort of node actually
1169 served as the original seed for the given block. */
1172 decl_ultimate_origin (decl)
1175 #ifdef ENABLE_CHECKING
1176 if (DECL_FROM_INLINE (DECL_ORIGIN (decl)))
1177 /* Since the DECL_ABSTRACT_ORIGIN for a DECL is supposed to be the
1178 most distant ancestor, this should never happen. */
1182 return DECL_ABSTRACT_ORIGIN (decl);
1185 /* Determine the "ultimate origin" of a block. The block may be an
1186 inlined instance of an inlined instance of a block which is local
1187 to an inline function, so we have to trace all of the way back
1188 through the origin chain to find out what sort of node actually
1189 served as the original seed for the given block. */
1192 block_ultimate_origin (block)
1193 register tree block;
1195 register tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
1197 if (immediate_origin == NULL)
1201 register tree ret_val;
1202 register tree lookahead = immediate_origin;
1206 ret_val = lookahead;
1207 lookahead = (TREE_CODE (ret_val) == BLOCK)
1208 ? BLOCK_ABSTRACT_ORIGIN (ret_val)
1211 while (lookahead != NULL && lookahead != ret_val);
1216 /* Get the class to which DECL belongs, if any. In g++, the DECL_CONTEXT
1217 of a virtual function may refer to a base class, so we check the 'this'
1221 decl_class_context (decl)
1224 tree context = NULL_TREE;
1225 if (TREE_CODE (decl) != FUNCTION_DECL || ! DECL_VINDEX (decl))
1226 context = DECL_CONTEXT (decl);
1228 context = TYPE_MAIN_VARIANT
1229 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
1231 if (context && TREE_CODE_CLASS (TREE_CODE (context)) != 't')
1232 context = NULL_TREE;
1239 output_unsigned_leb128 (value)
1240 register unsigned long value;
1242 register unsigned long orig_value = value;
1246 register unsigned byte = (value & 0x7f);
1249 if (value != 0) /* more bytes to follow */
1251 fprintf (asm_out_file, "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) byte);
1252 if (flag_debug_asm && value == 0)
1253 fprintf (asm_out_file, "\t%s ULEB128 number - value = %lu",
1254 ASM_COMMENT_START, orig_value);
1255 fputc ('\n', asm_out_file);
1261 output_signed_leb128 (value)
1262 register long value;
1264 register long orig_value = value;
1265 register int negative = (value < 0);
1270 register unsigned byte = (value & 0x7f);
1274 value |= 0xfe000000; /* manually sign extend */
1275 if (((value == 0) && ((byte & 0x40) == 0))
1276 || ((value == -1) && ((byte & 0x40) == 1)))
1283 fprintf (asm_out_file, "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) byte);
1284 if (flag_debug_asm && more == 0)
1285 fprintf (asm_out_file, "\t%s SLEB128 number - value = %ld",
1286 ASM_COMMENT_START, orig_value);
1287 fputc ('\n', asm_out_file);
1293 /**************** utility functions for attribute functions ******************/
1295 /* Given a pointer to a BLOCK node return non-zero if (and only if) the
1296 node in question represents the outermost pair of curly braces (i.e.
1297 the "body block") of a function or method.
1299 For any BLOCK node representing a "body block" of a function or method,
1300 the BLOCK_SUPERCONTEXT of the node will point to another BLOCK node
1301 which represents the outermost (function) scope for the function or
1302 method (i.e. the one which includes the formal parameters). The
1303 BLOCK_SUPERCONTEXT of *that* node in turn will point to the relevant
1308 is_body_block (stmt)
1311 if (TREE_CODE (stmt) == BLOCK)
1313 register tree parent = BLOCK_SUPERCONTEXT (stmt);
1315 if (TREE_CODE (parent) == BLOCK)
1317 register tree grandparent = BLOCK_SUPERCONTEXT (parent);
1319 if (TREE_CODE (grandparent) == FUNCTION_DECL)
1326 /* Given a pointer to a tree node for some type, return a Dwarf fundamental
1327 type code for the given type.
1329 This routine must only be called for GCC type nodes that correspond to
1330 Dwarf fundamental types.
1332 The current Dwarf draft specification calls for Dwarf fundamental types
1333 to accurately reflect the fact that a given type was either a "plain"
1334 integral type or an explicitly "signed" integral type. Unfortunately,
1335 we can't always do this, because GCC may already have thrown away the
1336 information about the precise way in which the type was originally
1339 typedef signed int my_type;
1341 struct s { my_type f; };
1343 Since we may be stuck here without enought information to do exactly
1344 what is called for in the Dwarf draft specification, we do the best
1345 that we can under the circumstances and always use the "plain" integral
1346 fundamental type codes for int, short, and long types. That's probably
1347 good enough. The additional accuracy called for in the current DWARF
1348 draft specification is probably never even useful in practice. */
1351 fundamental_type_code (type)
1354 if (TREE_CODE (type) == ERROR_MARK)
1357 switch (TREE_CODE (type))
1366 /* Carefully distinguish all the standard types of C,
1367 without messing up if the language is not C.
1368 Note that we check only for the names that contain spaces;
1369 other names might occur by coincidence in other languages. */
1370 if (TYPE_NAME (type) != 0
1371 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
1372 && DECL_NAME (TYPE_NAME (type)) != 0
1373 && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
1376 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
1378 if (!strcmp (name, "unsigned char"))
1379 return FT_unsigned_char;
1380 if (!strcmp (name, "signed char"))
1381 return FT_signed_char;
1382 if (!strcmp (name, "unsigned int"))
1383 return FT_unsigned_integer;
1384 if (!strcmp (name, "short int"))
1386 if (!strcmp (name, "short unsigned int"))
1387 return FT_unsigned_short;
1388 if (!strcmp (name, "long int"))
1390 if (!strcmp (name, "long unsigned int"))
1391 return FT_unsigned_long;
1392 if (!strcmp (name, "long long int"))
1393 return FT_long_long; /* Not grok'ed by svr4 SDB */
1394 if (!strcmp (name, "long long unsigned int"))
1395 return FT_unsigned_long_long; /* Not grok'ed by svr4 SDB */
1398 /* Most integer types will be sorted out above, however, for the
1399 sake of special `array index' integer types, the following code
1400 is also provided. */
1402 if (TYPE_PRECISION (type) == INT_TYPE_SIZE)
1403 return (TREE_UNSIGNED (type) ? FT_unsigned_integer : FT_integer);
1405 if (TYPE_PRECISION (type) == LONG_TYPE_SIZE)
1406 return (TREE_UNSIGNED (type) ? FT_unsigned_long : FT_long);
1408 if (TYPE_PRECISION (type) == LONG_LONG_TYPE_SIZE)
1409 return (TREE_UNSIGNED (type) ? FT_unsigned_long_long : FT_long_long);
1411 if (TYPE_PRECISION (type) == SHORT_TYPE_SIZE)
1412 return (TREE_UNSIGNED (type) ? FT_unsigned_short : FT_short);
1414 if (TYPE_PRECISION (type) == CHAR_TYPE_SIZE)
1415 return (TREE_UNSIGNED (type) ? FT_unsigned_char : FT_char);
1417 /* In C++, __java_boolean is an INTEGER_TYPE with precision == 1 */
1418 if (TYPE_PRECISION (type) == 1)
1424 /* Carefully distinguish all the standard types of C,
1425 without messing up if the language is not C. */
1426 if (TYPE_NAME (type) != 0
1427 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
1428 && DECL_NAME (TYPE_NAME (type)) != 0
1429 && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
1432 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
1434 /* Note that here we can run afowl of a serious bug in "classic"
1435 svr4 SDB debuggers. They don't seem to understand the
1436 FT_ext_prec_float type (even though they should). */
1438 if (!strcmp (name, "long double"))
1439 return FT_ext_prec_float;
1442 if (TYPE_PRECISION (type) == DOUBLE_TYPE_SIZE)
1444 /* On the SH, when compiling with -m3e or -m4-single-only, both
1445 float and double are 32 bits. But since the debugger doesn't
1446 know about the subtarget, it always thinks double is 64 bits.
1447 So we have to tell the debugger that the type is float to
1448 make the output of the 'print' command etc. readable. */
1449 if (DOUBLE_TYPE_SIZE == FLOAT_TYPE_SIZE && FLOAT_TYPE_SIZE == 32)
1451 return FT_dbl_prec_float;
1453 if (TYPE_PRECISION (type) == FLOAT_TYPE_SIZE)
1456 /* Note that here we can run afowl of a serious bug in "classic"
1457 svr4 SDB debuggers. They don't seem to understand the
1458 FT_ext_prec_float type (even though they should). */
1460 if (TYPE_PRECISION (type) == LONG_DOUBLE_TYPE_SIZE)
1461 return FT_ext_prec_float;
1465 return FT_complex; /* GNU FORTRAN COMPLEX type. */
1468 return FT_char; /* GNU Pascal CHAR type. Not used in C. */
1471 return FT_boolean; /* GNU FORTRAN BOOLEAN type. */
1474 abort (); /* No other TREE_CODEs are Dwarf fundamental types. */
1479 /* Given a pointer to an arbitrary ..._TYPE tree node, return a pointer to
1480 the Dwarf "root" type for the given input type. The Dwarf "root" type
1481 of a given type is generally the same as the given type, except that if
1482 the given type is a pointer or reference type, then the root type of
1483 the given type is the root type of the "basis" type for the pointer or
1484 reference type. (This definition of the "root" type is recursive.)
1485 Also, the root type of a `const' qualified type or a `volatile'
1486 qualified type is the root type of the given type without the
1490 root_type_1 (type, count)
1494 /* Give up after searching 1000 levels, in case this is a recursive
1495 pointer type. Such types are possible in Ada, but it is not possible
1496 to represent them in DWARF1 debug info. */
1498 return error_mark_node;
1500 switch (TREE_CODE (type))
1503 return error_mark_node;
1506 case REFERENCE_TYPE:
1507 return root_type_1 (TREE_TYPE (type), count+1);
1518 type = root_type_1 (type, 0);
1519 if (type != error_mark_node)
1520 type = type_main_variant (type);
1524 /* Given a pointer to an arbitrary ..._TYPE tree node, write out a sequence
1525 of zero or more Dwarf "type-modifier" bytes applicable to the type. */
1528 write_modifier_bytes_1 (type, decl_const, decl_volatile, count)
1530 register int decl_const;
1531 register int decl_volatile;
1534 if (TREE_CODE (type) == ERROR_MARK)
1537 /* Give up after searching 1000 levels, in case this is a recursive
1538 pointer type. Such types are possible in Ada, but it is not possible
1539 to represent them in DWARF1 debug info. */
1543 if (TYPE_READONLY (type) || decl_const)
1544 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_const);
1545 if (TYPE_VOLATILE (type) || decl_volatile)
1546 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_volatile);
1547 switch (TREE_CODE (type))
1550 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_pointer_to);
1551 write_modifier_bytes_1 (TREE_TYPE (type), 0, 0, count+1);
1554 case REFERENCE_TYPE:
1555 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_reference_to);
1556 write_modifier_bytes_1 (TREE_TYPE (type), 0, 0, count+1);
1566 write_modifier_bytes (type, decl_const, decl_volatile)
1568 register int decl_const;
1569 register int decl_volatile;
1571 write_modifier_bytes_1 (type, decl_const, decl_volatile, 0);
1574 /* Given a pointer to an arbitrary ..._TYPE tree node, return non-zero if the
1575 given input type is a Dwarf "fundamental" type. Otherwise return zero. */
1578 type_is_fundamental (type)
1581 switch (TREE_CODE (type))
1596 case QUAL_UNION_TYPE:
1601 case REFERENCE_TYPE:
1613 /* Given a pointer to some ..._DECL tree node, generate an assembly language
1614 equate directive which will associate a symbolic name with the current DIE.
1616 The name used is an artificial label generated from the DECL_UID number
1617 associated with the given decl node. The name it gets equated to is the
1618 symbolic label that we (previously) output at the start of the DIE that
1619 we are currently generating.
1621 Calling this function while generating some "decl related" form of DIE
1622 makes it possible to later refer to the DIE which represents the given
1623 decl simply by re-generating the symbolic name from the ..._DECL node's
1627 equate_decl_number_to_die_number (decl)
1630 /* In the case where we are generating a DIE for some ..._DECL node
1631 which represents either some inline function declaration or some
1632 entity declared within an inline function declaration/definition,
1633 setup a symbolic name for the current DIE so that we have a name
1634 for this DIE that we can easily refer to later on within
1635 AT_abstract_origin attributes. */
1637 char decl_label[MAX_ARTIFICIAL_LABEL_BYTES];
1638 char die_label[MAX_ARTIFICIAL_LABEL_BYTES];
1640 sprintf (decl_label, DECL_NAME_FMT, DECL_UID (decl));
1641 sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum);
1642 ASM_OUTPUT_DEF (asm_out_file, decl_label, die_label);
1645 /* Given a pointer to some ..._TYPE tree node, generate an assembly language
1646 equate directive which will associate a symbolic name with the current DIE.
1648 The name used is an artificial label generated from the TYPE_UID number
1649 associated with the given type node. The name it gets equated to is the
1650 symbolic label that we (previously) output at the start of the DIE that
1651 we are currently generating.
1653 Calling this function while generating some "type related" form of DIE
1654 makes it easy to later refer to the DIE which represents the given type
1655 simply by re-generating the alternative name from the ..._TYPE node's
1659 equate_type_number_to_die_number (type)
1662 char type_label[MAX_ARTIFICIAL_LABEL_BYTES];
1663 char die_label[MAX_ARTIFICIAL_LABEL_BYTES];
1665 /* We are generating a DIE to represent the main variant of this type
1666 (i.e the type without any const or volatile qualifiers) so in order
1667 to get the equate to come out right, we need to get the main variant
1670 type = type_main_variant (type);
1672 sprintf (type_label, TYPE_NAME_FMT, TYPE_UID (type));
1673 sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum);
1674 ASM_OUTPUT_DEF (asm_out_file, type_label, die_label);
1678 output_reg_number (rtl)
1681 register unsigned regno = REGNO (rtl);
1683 if (regno >= DWARF_FRAME_REGISTERS)
1685 warning_with_decl (dwarf_last_decl, "internal regno botch: regno = %d\n",
1689 fprintf (asm_out_file, "\t%s\t0x%x",
1690 UNALIGNED_INT_ASM_OP, DBX_REGISTER_NUMBER (regno));
1693 fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
1694 PRINT_REG (rtl, 0, asm_out_file);
1696 fputc ('\n', asm_out_file);
1699 /* The following routine is a nice and simple transducer. It converts the
1700 RTL for a variable or parameter (resident in memory) into an equivalent
1701 Dwarf representation of a mechanism for getting the address of that same
1702 variable onto the top of a hypothetical "address evaluation" stack.
1704 When creating memory location descriptors, we are effectively trans-
1705 forming the RTL for a memory-resident object into its Dwarf postfix
1706 expression equivalent. This routine just recursively descends an
1707 RTL tree, turning it into Dwarf postfix code as it goes. */
1710 output_mem_loc_descriptor (rtl)
1713 /* Note that for a dynamically sized array, the location we will
1714 generate a description of here will be the lowest numbered location
1715 which is actually within the array. That's *not* necessarily the
1716 same as the zeroth element of the array. */
1718 switch (GET_CODE (rtl))
1722 /* The case of a subreg may arise when we have a local (register)
1723 variable or a formal (register) parameter which doesn't quite
1724 fill up an entire register. For now, just assume that it is
1725 legitimate to make the Dwarf info refer to the whole register
1726 which contains the given subreg. */
1728 rtl = XEXP (rtl, 0);
1733 /* Whenever a register number forms a part of the description of
1734 the method for calculating the (dynamic) address of a memory
1735 resident object, DWARF rules require the register number to
1736 be referred to as a "base register". This distinction is not
1737 based in any way upon what category of register the hardware
1738 believes the given register belongs to. This is strictly
1739 DWARF terminology we're dealing with here.
1741 Note that in cases where the location of a memory-resident data
1742 object could be expressed as:
1744 OP_ADD (OP_BASEREG (basereg), OP_CONST (0))
1746 the actual DWARF location descriptor that we generate may just
1747 be OP_BASEREG (basereg). This may look deceptively like the
1748 object in question was allocated to a register (rather than
1749 in memory) so DWARF consumers need to be aware of the subtle
1750 distinction between OP_REG and OP_BASEREG. */
1752 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_BASEREG);
1753 output_reg_number (rtl);
1757 output_mem_loc_descriptor (XEXP (rtl, 0));
1758 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_DEREF4);
1763 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADDR);
1764 ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl);
1768 output_mem_loc_descriptor (XEXP (rtl, 0));
1769 output_mem_loc_descriptor (XEXP (rtl, 1));
1770 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD);
1774 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST);
1775 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, INTVAL (rtl));
1779 /* If a pseudo-reg is optimized away, it is possible for it to
1780 be replaced with a MEM containing a multiply. Use a GNU extension
1782 output_mem_loc_descriptor (XEXP (rtl, 0));
1783 output_mem_loc_descriptor (XEXP (rtl, 1));
1784 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_MULT);
1792 /* Output a proper Dwarf location descriptor for a variable or parameter
1793 which is either allocated in a register or in a memory location. For
1794 a register, we just generate an OP_REG and the register number. For a
1795 memory location we provide a Dwarf postfix expression describing how to
1796 generate the (dynamic) address of the object onto the address stack. */
1799 output_loc_descriptor (rtl)
1802 switch (GET_CODE (rtl))
1806 /* The case of a subreg may arise when we have a local (register)
1807 variable or a formal (register) parameter which doesn't quite
1808 fill up an entire register. For now, just assume that it is
1809 legitimate to make the Dwarf info refer to the whole register
1810 which contains the given subreg. */
1812 rtl = XEXP (rtl, 0);
1816 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_REG);
1817 output_reg_number (rtl);
1821 output_mem_loc_descriptor (XEXP (rtl, 0));
1825 abort (); /* Should never happen */
1829 /* Given a tree node describing an array bound (either lower or upper)
1830 output a representation for that bound. */
1833 output_bound_representation (bound, dim_num, u_or_l)
1834 register tree bound;
1835 register unsigned dim_num; /* For multi-dimensional arrays. */
1836 register char u_or_l; /* Designates upper or lower bound. */
1838 switch (TREE_CODE (bound))
1844 /* All fixed-bounds are represented by INTEGER_CST nodes. */
1847 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
1848 (unsigned) TREE_INT_CST_LOW (bound));
1853 /* Dynamic bounds may be represented by NOP_EXPR nodes containing
1854 SAVE_EXPR nodes, in which case we can do something, or as
1855 an expression, which we cannot represent. */
1857 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
1858 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
1860 sprintf (begin_label, BOUND_BEGIN_LABEL_FMT,
1861 current_dienum, dim_num, u_or_l);
1863 sprintf (end_label, BOUND_END_LABEL_FMT,
1864 current_dienum, dim_num, u_or_l);
1866 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
1867 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
1869 /* If optimization is turned on, the SAVE_EXPRs that describe
1870 how to access the upper bound values are essentially bogus.
1871 They only describe (at best) how to get at these values at
1872 the points in the generated code right after they have just
1873 been computed. Worse yet, in the typical case, the upper
1874 bound values will not even *be* computed in the optimized
1875 code, so these SAVE_EXPRs are entirely bogus.
1877 In order to compensate for this fact, we check here to see
1878 if optimization is enabled, and if so, we effectively create
1879 an empty location description for the (unknown and unknowable)
1882 This should not cause too much trouble for existing (stupid?)
1883 debuggers because they have to deal with empty upper bounds
1884 location descriptions anyway in order to be able to deal with
1885 incomplete array types.
1887 Of course an intelligent debugger (GDB?) should be able to
1888 comprehend that a missing upper bound specification in a
1889 array type used for a storage class `auto' local array variable
1890 indicates that the upper bound is both unknown (at compile-
1891 time) and unknowable (at run-time) due to optimization. */
1895 while (TREE_CODE (bound) == NOP_EXPR
1896 || TREE_CODE (bound) == CONVERT_EXPR)
1897 bound = TREE_OPERAND (bound, 0);
1899 if (TREE_CODE (bound) == SAVE_EXPR)
1900 output_loc_descriptor
1901 (eliminate_regs (SAVE_EXPR_RTL (bound), 0, NULL_RTX));
1904 ASM_OUTPUT_LABEL (asm_out_file, end_label);
1911 /* Recursive function to output a sequence of value/name pairs for
1912 enumeration constants in reversed order. This is called from
1913 enumeration_type_die. */
1916 output_enumeral_list (link)
1921 output_enumeral_list (TREE_CHAIN (link));
1922 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
1923 (unsigned) TREE_INT_CST_LOW (TREE_VALUE (link)));
1924 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
1925 IDENTIFIER_POINTER (TREE_PURPOSE (link)));
1929 /* Given an unsigned value, round it up to the lowest multiple of `boundary'
1930 which is not less than the value itself. */
1932 static inline unsigned
1933 ceiling (value, boundary)
1934 register unsigned value;
1935 register unsigned boundary;
1937 return (((value + boundary - 1) / boundary) * boundary);
1940 /* Given a pointer to what is assumed to be a FIELD_DECL node, return a
1941 pointer to the declared type for the relevant field variable, or return
1942 `integer_type_node' if the given node turns out to be an ERROR_MARK node. */
1950 if (TREE_CODE (decl) == ERROR_MARK)
1951 return integer_type_node;
1953 type = DECL_BIT_FIELD_TYPE (decl);
1955 type = TREE_TYPE (decl);
1959 /* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
1960 node, return the alignment in bits for the type, or else return
1961 BITS_PER_WORD if the node actually turns out to be an ERROR_MARK node. */
1963 static inline unsigned
1964 simple_type_align_in_bits (type)
1967 return (TREE_CODE (type) != ERROR_MARK) ? TYPE_ALIGN (type) : BITS_PER_WORD;
1970 /* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
1971 node, return the size in bits for the type if it is a constant, or
1972 else return the alignment for the type if the type's size is not
1973 constant, or else return BITS_PER_WORD if the type actually turns out
1974 to be an ERROR_MARK node. */
1976 static inline unsigned
1977 simple_type_size_in_bits (type)
1980 if (TREE_CODE (type) == ERROR_MARK)
1981 return BITS_PER_WORD;
1984 register tree type_size_tree = TYPE_SIZE (type);
1986 if (TREE_CODE (type_size_tree) != INTEGER_CST)
1987 return TYPE_ALIGN (type);
1989 return (unsigned) TREE_INT_CST_LOW (type_size_tree);
1993 /* Given a pointer to what is assumed to be a FIELD_DECL node, compute and
1994 return the byte offset of the lowest addressed byte of the "containing
1995 object" for the given FIELD_DECL, or return 0 if we are unable to deter-
1996 mine what that offset is, either because the argument turns out to be a
1997 pointer to an ERROR_MARK node, or because the offset is actually variable.
1998 (We can't handle the latter case just yet.) */
2001 field_byte_offset (decl)
2004 register unsigned type_align_in_bytes;
2005 register unsigned type_align_in_bits;
2006 register unsigned type_size_in_bits;
2007 register unsigned object_offset_in_align_units;
2008 register unsigned object_offset_in_bits;
2009 register unsigned object_offset_in_bytes;
2011 register tree bitpos_tree;
2012 register tree field_size_tree;
2013 register unsigned bitpos_int;
2014 register unsigned deepest_bitpos;
2015 register unsigned field_size_in_bits;
2017 if (TREE_CODE (decl) == ERROR_MARK)
2020 if (TREE_CODE (decl) != FIELD_DECL)
2023 type = field_type (decl);
2025 bitpos_tree = DECL_FIELD_BITPOS (decl);
2026 field_size_tree = DECL_SIZE (decl);
2028 /* If there was an error, the size could be zero. */
2029 if (! field_size_tree)
2037 /* We cannot yet cope with fields whose positions or sizes are variable,
2038 so for now, when we see such things, we simply return 0. Someday,
2039 we may be able to handle such cases, but it will be damn difficult. */
2041 if (TREE_CODE (bitpos_tree) != INTEGER_CST)
2043 bitpos_int = (unsigned) TREE_INT_CST_LOW (bitpos_tree);
2045 if (TREE_CODE (field_size_tree) != INTEGER_CST)
2047 field_size_in_bits = (unsigned) TREE_INT_CST_LOW (field_size_tree);
2049 type_size_in_bits = simple_type_size_in_bits (type);
2051 type_align_in_bits = simple_type_align_in_bits (type);
2052 type_align_in_bytes = type_align_in_bits / BITS_PER_UNIT;
2054 /* Note that the GCC front-end doesn't make any attempt to keep track
2055 of the starting bit offset (relative to the start of the containing
2056 structure type) of the hypothetical "containing object" for a bit-
2057 field. Thus, when computing the byte offset value for the start of
2058 the "containing object" of a bit-field, we must deduce this infor-
2061 This can be rather tricky to do in some cases. For example, handling
2062 the following structure type definition when compiling for an i386/i486
2063 target (which only aligns long long's to 32-bit boundaries) can be very
2068 long long field2:31;
2071 Fortunately, there is a simple rule-of-thumb which can be used in such
2072 cases. When compiling for an i386/i486, GCC will allocate 8 bytes for
2073 the structure shown above. It decides to do this based upon one simple
2074 rule for bit-field allocation. Quite simply, GCC allocates each "con-
2075 taining object" for each bit-field at the first (i.e. lowest addressed)
2076 legitimate alignment boundary (based upon the required minimum alignment
2077 for the declared type of the field) which it can possibly use, subject
2078 to the condition that there is still enough available space remaining
2079 in the containing object (when allocated at the selected point) to
2080 fully accommodate all of the bits of the bit-field itself.
2082 This simple rule makes it obvious why GCC allocates 8 bytes for each
2083 object of the structure type shown above. When looking for a place to
2084 allocate the "containing object" for `field2', the compiler simply tries
2085 to allocate a 64-bit "containing object" at each successive 32-bit
2086 boundary (starting at zero) until it finds a place to allocate that 64-
2087 bit field such that at least 31 contiguous (and previously unallocated)
2088 bits remain within that selected 64 bit field. (As it turns out, for
2089 the example above, the compiler finds that it is OK to allocate the
2090 "containing object" 64-bit field at bit-offset zero within the
2093 Here we attempt to work backwards from the limited set of facts we're
2094 given, and we try to deduce from those facts, where GCC must have
2095 believed that the containing object started (within the structure type).
2097 The value we deduce is then used (by the callers of this routine) to
2098 generate AT_location and AT_bit_offset attributes for fields (both
2099 bit-fields and, in the case of AT_location, regular fields as well).
2102 /* Figure out the bit-distance from the start of the structure to the
2103 "deepest" bit of the bit-field. */
2104 deepest_bitpos = bitpos_int + field_size_in_bits;
2106 /* This is the tricky part. Use some fancy footwork to deduce where the
2107 lowest addressed bit of the containing object must be. */
2108 object_offset_in_bits
2109 = ceiling (deepest_bitpos, type_align_in_bits) - type_size_in_bits;
2111 /* Compute the offset of the containing object in "alignment units". */
2112 object_offset_in_align_units = object_offset_in_bits / type_align_in_bits;
2114 /* Compute the offset of the containing object in bytes. */
2115 object_offset_in_bytes = object_offset_in_align_units * type_align_in_bytes;
2117 /* The above code assumes that the field does not cross an alignment
2118 boundary. This can happen if PCC_BITFIELD_TYPE_MATTERS is not defined,
2119 or if the structure is packed. If this happens, then we get an object
2120 which starts after the bitfield, which means that the bit offset is
2121 negative. Gdb fails when given negative bit offsets. We avoid this
2122 by recomputing using the first bit of the bitfield. This will give
2123 us an object which does not completely contain the bitfield, but it
2124 will be aligned, and it will contain the first bit of the bitfield.
2126 However, only do this for a BYTES_BIG_ENDIAN target. For a
2127 ! BYTES_BIG_ENDIAN target, bitpos_int + field_size_in_bits is the first
2128 first bit of the bitfield. If we recompute using bitpos_int + 1 below,
2129 then we end up computing the object byte offset for the wrong word of the
2130 desired bitfield, which in turn causes the field offset to be negative
2131 in bit_offset_attribute. */
2132 if (BYTES_BIG_ENDIAN
2133 && object_offset_in_bits > bitpos_int)
2135 deepest_bitpos = bitpos_int + 1;
2136 object_offset_in_bits
2137 = ceiling (deepest_bitpos, type_align_in_bits) - type_size_in_bits;
2138 object_offset_in_align_units = (object_offset_in_bits
2139 / type_align_in_bits);
2140 object_offset_in_bytes = (object_offset_in_align_units
2141 * type_align_in_bytes);
2144 return object_offset_in_bytes;
2147 /****************************** attributes *********************************/
2149 /* The following routines are responsible for writing out the various types
2150 of Dwarf attributes (and any following data bytes associated with them).
2151 These routines are listed in order based on the numerical codes of their
2152 associated attributes. */
2154 /* Generate an AT_sibling attribute. */
2157 sibling_attribute ()
2159 char label[MAX_ARTIFICIAL_LABEL_BYTES];
2161 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sibling);
2162 sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM);
2163 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
2166 /* Output the form of location attributes suitable for whole variables and
2167 whole parameters. Note that the location attributes for struct fields
2168 are generated by the routine `data_member_location_attribute' below. */
2171 location_attribute (rtl)
2174 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2175 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2177 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location);
2178 sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
2179 sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
2180 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2181 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2183 /* Handle a special case. If we are about to output a location descriptor
2184 for a variable or parameter which has been optimized out of existence,
2185 don't do that. Instead we output a zero-length location descriptor
2186 value as part of the location attribute.
2188 A variable which has been optimized out of existence will have a
2189 DECL_RTL value which denotes a pseudo-reg.
2191 Currently, in some rare cases, variables can have DECL_RTL values
2192 which look like (MEM (REG pseudo-reg#)). These cases are due to
2193 bugs elsewhere in the compiler. We treat such cases
2194 as if the variable(s) in question had been optimized out of existence.
2196 Note that in all cases where we wish to express the fact that a
2197 variable has been optimized out of existence, we do not simply
2198 suppress the generation of the entire location attribute because
2199 the absence of a location attribute in certain kinds of DIEs is
2200 used to indicate something else entirely... i.e. that the DIE
2201 represents an object declaration, but not a definition. So saith
2205 if (! is_pseudo_reg (rtl)
2206 && (GET_CODE (rtl) != MEM || ! is_pseudo_reg (XEXP (rtl, 0))))
2207 output_loc_descriptor (rtl);
2209 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2212 /* Output the specialized form of location attribute used for data members
2213 of struct and union types.
2215 In the special case of a FIELD_DECL node which represents a bit-field,
2216 the "offset" part of this special location descriptor must indicate the
2217 distance in bytes from the lowest-addressed byte of the containing
2218 struct or union type to the lowest-addressed byte of the "containing
2219 object" for the bit-field. (See the `field_byte_offset' function above.)
2221 For any given bit-field, the "containing object" is a hypothetical
2222 object (of some integral or enum type) within which the given bit-field
2223 lives. The type of this hypothetical "containing object" is always the
2224 same as the declared type of the individual bit-field itself (for GCC
2225 anyway... the DWARF spec doesn't actually mandate this).
2227 Note that it is the size (in bytes) of the hypothetical "containing
2228 object" which will be given in the AT_byte_size attribute for this
2229 bit-field. (See the `byte_size_attribute' function below.) It is
2230 also used when calculating the value of the AT_bit_offset attribute.
2231 (See the `bit_offset_attribute' function below.) */
2234 data_member_location_attribute (t)
2237 register unsigned object_offset_in_bytes;
2238 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2239 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2241 if (TREE_CODE (t) == TREE_VEC)
2242 object_offset_in_bytes = TREE_INT_CST_LOW (BINFO_OFFSET (t));
2244 object_offset_in_bytes = field_byte_offset (t);
2246 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location);
2247 sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
2248 sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
2249 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2250 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2251 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST);
2252 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, object_offset_in_bytes);
2253 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD);
2254 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2257 /* Output an AT_const_value attribute for a variable or a parameter which
2258 does not have a "location" either in memory or in a register. These
2259 things can arise in GNU C when a constant is passed as an actual
2260 parameter to an inlined function. They can also arise in C++ where
2261 declared constants do not necessarily get memory "homes". */
2264 const_value_attribute (rtl)
2267 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2268 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2270 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_const_value_block4);
2271 sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
2272 sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
2273 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
2274 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2276 switch (GET_CODE (rtl))
2279 /* Note that a CONST_INT rtx could represent either an integer or
2280 a floating-point constant. A CONST_INT is used whenever the
2281 constant will fit into a single word. In all such cases, the
2282 original mode of the constant value is wiped out, and the
2283 CONST_INT rtx is assigned VOIDmode. Since we no longer have
2284 precise mode information for these constants, we always just
2285 output them using 4 bytes. */
2287 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, (unsigned) INTVAL (rtl));
2291 /* Note that a CONST_DOUBLE rtx could represent either an integer
2292 or a floating-point constant. A CONST_DOUBLE is used whenever
2293 the constant requires more than one word in order to be adequately
2294 represented. In all such cases, the original mode of the constant
2295 value is preserved as the mode of the CONST_DOUBLE rtx, but for
2296 simplicity we always just output CONST_DOUBLEs using 8 bytes. */
2298 ASM_OUTPUT_DWARF_DATA8 (asm_out_file,
2299 (unsigned HOST_WIDE_INT) CONST_DOUBLE_HIGH (rtl),
2300 (unsigned HOST_WIDE_INT) CONST_DOUBLE_LOW (rtl));
2304 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, XSTR (rtl, 0));
2310 ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl);
2314 /* In cases where an inlined instance of an inline function is passed
2315 the address of an `auto' variable (which is local to the caller)
2316 we can get a situation where the DECL_RTL of the artificial
2317 local variable (for the inlining) which acts as a stand-in for
2318 the corresponding formal parameter (of the inline function)
2319 will look like (plus:SI (reg:SI FRAME_PTR) (const_int ...)).
2320 This is not exactly a compile-time constant expression, but it
2321 isn't the address of the (artificial) local variable either.
2322 Rather, it represents the *value* which the artificial local
2323 variable always has during its lifetime. We currently have no
2324 way to represent such quasi-constant values in Dwarf, so for now
2325 we just punt and generate an AT_const_value attribute with form
2326 FORM_BLOCK4 and a length of zero. */
2330 abort (); /* No other kinds of rtx should be possible here. */
2333 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2336 /* Generate *either* an AT_location attribute or else an AT_const_value
2337 data attribute for a variable or a parameter. We generate the
2338 AT_const_value attribute only in those cases where the given
2339 variable or parameter does not have a true "location" either in
2340 memory or in a register. This can happen (for example) when a
2341 constant is passed as an actual argument in a call to an inline
2342 function. (It's possible that these things can crop up in other
2343 ways also.) Note that one type of constant value which can be
2344 passed into an inlined function is a constant pointer. This can
2345 happen for example if an actual argument in an inlined function
2346 call evaluates to a compile-time constant address. */
2349 location_or_const_value_attribute (decl)
2354 if (TREE_CODE (decl) == ERROR_MARK)
2357 if ((TREE_CODE (decl) != VAR_DECL) && (TREE_CODE (decl) != PARM_DECL))
2359 /* Should never happen. */
2364 /* Here we have to decide where we are going to say the parameter "lives"
2365 (as far as the debugger is concerned). We only have a couple of choices.
2366 GCC provides us with DECL_RTL and with DECL_INCOMING_RTL. DECL_RTL
2367 normally indicates where the parameter lives during most of the activa-
2368 tion of the function. If optimization is enabled however, this could
2369 be either NULL or else a pseudo-reg. Both of those cases indicate that
2370 the parameter doesn't really live anywhere (as far as the code generation
2371 parts of GCC are concerned) during most of the function's activation.
2372 That will happen (for example) if the parameter is never referenced
2373 within the function.
2375 We could just generate a location descriptor here for all non-NULL
2376 non-pseudo values of DECL_RTL and ignore all of the rest, but we can
2377 be a little nicer than that if we also consider DECL_INCOMING_RTL in
2378 cases where DECL_RTL is NULL or is a pseudo-reg.
2380 Note however that we can only get away with using DECL_INCOMING_RTL as
2381 a backup substitute for DECL_RTL in certain limited cases. In cases
2382 where DECL_ARG_TYPE(decl) indicates the same type as TREE_TYPE(decl)
2383 we can be sure that the parameter was passed using the same type as it
2384 is declared to have within the function, and that its DECL_INCOMING_RTL
2385 points us to a place where a value of that type is passed. In cases
2386 where DECL_ARG_TYPE(decl) and TREE_TYPE(decl) are different types
2387 however, we cannot (in general) use DECL_INCOMING_RTL as a backup
2388 substitute for DECL_RTL because in these cases, DECL_INCOMING_RTL
2389 points us to a value of some type which is *different* from the type
2390 of the parameter itself. Thus, if we tried to use DECL_INCOMING_RTL
2391 to generate a location attribute in such cases, the debugger would
2392 end up (for example) trying to fetch a `float' from a place which
2393 actually contains the first part of a `double'. That would lead to
2394 really incorrect and confusing output at debug-time, and we don't
2395 want that now do we?
2397 So in general, we DO NOT use DECL_INCOMING_RTL as a backup for DECL_RTL
2398 in cases where DECL_ARG_TYPE(decl) != TREE_TYPE(decl). There are a
2399 couple of cute exceptions however. On little-endian machines we can
2400 get away with using DECL_INCOMING_RTL even when DECL_ARG_TYPE(decl) is
2401 not the same as TREE_TYPE(decl) but only when DECL_ARG_TYPE(decl) is
2402 an integral type which is smaller than TREE_TYPE(decl). These cases
2403 arise when (on a little-endian machine) a non-prototyped function has
2404 a parameter declared to be of type `short' or `char'. In such cases,
2405 TREE_TYPE(decl) will be `short' or `char', DECL_ARG_TYPE(decl) will be
2406 `int', and DECL_INCOMING_RTL will point to the lowest-order byte of the
2407 passed `int' value. If the debugger then uses that address to fetch a
2408 `short' or a `char' (on a little-endian machine) the result will be the
2409 correct data, so we allow for such exceptional cases below.
2411 Note that our goal here is to describe the place where the given formal
2412 parameter lives during most of the function's activation (i.e. between
2413 the end of the prologue and the start of the epilogue). We'll do that
2414 as best as we can. Note however that if the given formal parameter is
2415 modified sometime during the execution of the function, then a stack
2416 backtrace (at debug-time) will show the function as having been called
2417 with the *new* value rather than the value which was originally passed
2418 in. This happens rarely enough that it is not a major problem, but it
2419 *is* a problem, and I'd like to fix it. A future version of dwarfout.c
2420 may generate two additional attributes for any given TAG_formal_parameter
2421 DIE which will describe the "passed type" and the "passed location" for
2422 the given formal parameter in addition to the attributes we now generate
2423 to indicate the "declared type" and the "active location" for each
2424 parameter. This additional set of attributes could be used by debuggers
2425 for stack backtraces.
2427 Separately, note that sometimes DECL_RTL can be NULL and DECL_INCOMING_RTL
2428 can be NULL also. This happens (for example) for inlined-instances of
2429 inline function formal parameters which are never referenced. This really
2430 shouldn't be happening. All PARM_DECL nodes should get valid non-NULL
2431 DECL_INCOMING_RTL values, but integrate.c doesn't currently generate
2432 these values for inlined instances of inline function parameters, so
2433 when we see such cases, we are just out-of-luck for the time
2434 being (until integrate.c gets fixed).
2437 /* Use DECL_RTL as the "location" unless we find something better. */
2438 rtl = DECL_RTL (decl);
2440 if (TREE_CODE (decl) == PARM_DECL)
2441 if (rtl == NULL_RTX || is_pseudo_reg (rtl))
2443 /* This decl represents a formal parameter which was optimized out. */
2444 register tree declared_type = type_main_variant (TREE_TYPE (decl));
2445 register tree passed_type = type_main_variant (DECL_ARG_TYPE (decl));
2447 /* Note that DECL_INCOMING_RTL may be NULL in here, but we handle
2448 *all* cases where (rtl == NULL_RTX) just below. */
2450 if (declared_type == passed_type)
2451 rtl = DECL_INCOMING_RTL (decl);
2452 else if (! BYTES_BIG_ENDIAN)
2453 if (TREE_CODE (declared_type) == INTEGER_TYPE)
2454 if (TYPE_SIZE (declared_type) <= TYPE_SIZE (passed_type))
2455 rtl = DECL_INCOMING_RTL (decl);
2458 if (rtl == NULL_RTX)
2461 rtl = eliminate_regs (rtl, 0, NULL_RTX);
2462 #ifdef LEAF_REG_REMAP
2463 if (current_function_uses_only_leaf_regs)
2464 leaf_renumber_regs_insn (rtl);
2467 switch (GET_CODE (rtl))
2470 /* The address of a variable that was optimized away; don't emit
2480 case PLUS: /* DECL_RTL could be (plus (reg ...) (const_int ...)) */
2481 const_value_attribute (rtl);
2487 location_attribute (rtl);
2491 /* ??? CONCAT is used for complex variables, which may have the real
2492 part stored in one place and the imag part stored somewhere else.
2493 DWARF1 has no way to describe a variable that lives in two different
2494 places, so we just describe where the first part lives, and hope that
2495 the second part is stored after it. */
2496 location_attribute (XEXP (rtl, 0));
2500 abort (); /* Should never happen. */
2504 /* Generate an AT_name attribute given some string value to be included as
2505 the value of the attribute. */
2508 name_attribute (name_string)
2509 register const char *name_string;
2511 if (name_string && *name_string)
2513 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_name);
2514 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, name_string);
2519 fund_type_attribute (ft_code)
2520 register unsigned ft_code;
2522 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_fund_type);
2523 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, ft_code);
2527 mod_fund_type_attribute (type, decl_const, decl_volatile)
2529 register int decl_const;
2530 register int decl_volatile;
2532 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2533 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2535 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_fund_type);
2536 sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum);
2537 sprintf (end_label, MT_END_LABEL_FMT, current_dienum);
2538 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2539 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2540 write_modifier_bytes (type, decl_const, decl_volatile);
2541 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file,
2542 fundamental_type_code (root_type (type)));
2543 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2547 user_def_type_attribute (type)
2550 char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES];
2552 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_user_def_type);
2553 sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (type));
2554 ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name);
2558 mod_u_d_type_attribute (type, decl_const, decl_volatile)
2560 register int decl_const;
2561 register int decl_volatile;
2563 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2564 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2565 char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES];
2567 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_u_d_type);
2568 sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum);
2569 sprintf (end_label, MT_END_LABEL_FMT, current_dienum);
2570 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2571 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2572 write_modifier_bytes (type, decl_const, decl_volatile);
2573 sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (root_type (type)));
2574 ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name);
2575 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2578 #ifdef USE_ORDERING_ATTRIBUTE
2580 ordering_attribute (ordering)
2581 register unsigned ordering;
2583 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_ordering);
2584 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, ordering);
2586 #endif /* defined(USE_ORDERING_ATTRIBUTE) */
2588 /* Note that the block of subscript information for an array type also
2589 includes information about the element type of type given array type. */
2592 subscript_data_attribute (type)
2595 register unsigned dimension_number;
2596 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2597 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2599 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_subscr_data);
2600 sprintf (begin_label, SS_BEGIN_LABEL_FMT, current_dienum);
2601 sprintf (end_label, SS_END_LABEL_FMT, current_dienum);
2602 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2603 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2605 /* The GNU compilers represent multidimensional array types as sequences
2606 of one dimensional array types whose element types are themselves array
2607 types. Here we squish that down, so that each multidimensional array
2608 type gets only one array_type DIE in the Dwarf debugging info. The
2609 draft Dwarf specification say that we are allowed to do this kind
2610 of compression in C (because there is no difference between an
2611 array or arrays and a multidimensional array in C) but for other
2612 source languages (e.g. Ada) we probably shouldn't do this. */
2614 for (dimension_number = 0;
2615 TREE_CODE (type) == ARRAY_TYPE;
2616 type = TREE_TYPE (type), dimension_number++)
2618 register tree domain = TYPE_DOMAIN (type);
2620 /* Arrays come in three flavors. Unspecified bounds, fixed
2621 bounds, and (in GNU C only) variable bounds. Handle all
2622 three forms here. */
2626 /* We have an array type with specified bounds. */
2628 register tree lower = TYPE_MIN_VALUE (domain);
2629 register tree upper = TYPE_MAX_VALUE (domain);
2631 /* Handle only fundamental types as index types for now. */
2633 if (! type_is_fundamental (domain))
2636 /* Output the representation format byte for this dimension. */
2638 ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file,
2639 FMT_CODE (1, TREE_CODE (lower) == INTEGER_CST,
2640 (upper && TREE_CODE (upper) == INTEGER_CST)));
2642 /* Output the index type for this dimension. */
2644 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file,
2645 fundamental_type_code (domain));
2647 /* Output the representation for the lower bound. */
2649 output_bound_representation (lower, dimension_number, 'l');
2651 /* Output the representation for the upper bound. */
2653 output_bound_representation (upper, dimension_number, 'u');
2657 /* We have an array type with an unspecified length. For C and
2658 C++ we can assume that this really means that (a) the index
2659 type is an integral type, and (b) the lower bound is zero.
2660 Note that Dwarf defines the representation of an unspecified
2661 (upper) bound as being a zero-length location description. */
2663 /* Output the array-bounds format byte. */
2665 ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_FT_C_X);
2667 /* Output the (assumed) index type. */
2669 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, FT_integer);
2671 /* Output the (assumed) lower bound (constant) value. */
2673 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
2675 /* Output the (empty) location description for the upper bound. */
2677 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0);
2681 /* Output the prefix byte that says that the element type is coming up. */
2683 ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_ET);
2685 /* Output a representation of the type of the elements of this array type. */
2687 type_attribute (type, 0, 0);
2689 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2693 byte_size_attribute (tree_node)
2694 register tree tree_node;
2696 register unsigned size;
2698 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_byte_size);
2699 switch (TREE_CODE (tree_node))
2708 case QUAL_UNION_TYPE:
2710 size = int_size_in_bytes (tree_node);
2714 /* For a data member of a struct or union, the AT_byte_size is
2715 generally given as the number of bytes normally allocated for
2716 an object of the *declared* type of the member itself. This
2717 is true even for bit-fields. */
2718 size = simple_type_size_in_bits (field_type (tree_node))
2726 /* Note that `size' might be -1 when we get to this point. If it
2727 is, that indicates that the byte size of the entity in question
2728 is variable. We have no good way of expressing this fact in Dwarf
2729 at the present time, so just let the -1 pass on through. */
2731 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, size);
2734 /* For a FIELD_DECL node which represents a bit-field, output an attribute
2735 which specifies the distance in bits from the highest order bit of the
2736 "containing object" for the bit-field to the highest order bit of the
2739 For any given bit-field, the "containing object" is a hypothetical
2740 object (of some integral or enum type) within which the given bit-field
2741 lives. The type of this hypothetical "containing object" is always the
2742 same as the declared type of the individual bit-field itself.
2744 The determination of the exact location of the "containing object" for
2745 a bit-field is rather complicated. It's handled by the `field_byte_offset'
2748 Note that it is the size (in bytes) of the hypothetical "containing
2749 object" which will be given in the AT_byte_size attribute for this
2750 bit-field. (See `byte_size_attribute' above.) */
2753 bit_offset_attribute (decl)
2756 register unsigned object_offset_in_bytes = field_byte_offset (decl);
2757 register tree type = DECL_BIT_FIELD_TYPE (decl);
2758 register tree bitpos_tree = DECL_FIELD_BITPOS (decl);
2759 register unsigned bitpos_int;
2760 register unsigned highest_order_object_bit_offset;
2761 register unsigned highest_order_field_bit_offset;
2762 register unsigned bit_offset;
2764 /* Must be a bit field. */
2766 || TREE_CODE (decl) != FIELD_DECL)
2769 /* We can't yet handle bit-fields whose offsets are variable, so if we
2770 encounter such things, just return without generating any attribute
2773 if (TREE_CODE (bitpos_tree) != INTEGER_CST)
2775 bitpos_int = (unsigned) TREE_INT_CST_LOW (bitpos_tree);
2777 /* Note that the bit offset is always the distance (in bits) from the
2778 highest-order bit of the "containing object" to the highest-order
2779 bit of the bit-field itself. Since the "high-order end" of any
2780 object or field is different on big-endian and little-endian machines,
2781 the computation below must take account of these differences. */
2783 highest_order_object_bit_offset = object_offset_in_bytes * BITS_PER_UNIT;
2784 highest_order_field_bit_offset = bitpos_int;
2786 if (! BYTES_BIG_ENDIAN)
2788 highest_order_field_bit_offset
2789 += (unsigned) TREE_INT_CST_LOW (DECL_SIZE (decl));
2791 highest_order_object_bit_offset += simple_type_size_in_bits (type);
2796 ? highest_order_object_bit_offset - highest_order_field_bit_offset
2797 : highest_order_field_bit_offset - highest_order_object_bit_offset);
2799 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_offset);
2800 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, bit_offset);
2803 /* For a FIELD_DECL node which represents a bit field, output an attribute
2804 which specifies the length in bits of the given field. */
2807 bit_size_attribute (decl)
2810 /* Must be a field and a bit field. */
2811 if (TREE_CODE (decl) != FIELD_DECL
2812 || ! DECL_BIT_FIELD_TYPE (decl))
2815 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_size);
2816 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
2817 (unsigned) TREE_INT_CST_LOW (DECL_SIZE (decl)));
2820 /* The following routine outputs the `element_list' attribute for enumeration
2821 type DIEs. The element_lits attribute includes the names and values of
2822 all of the enumeration constants associated with the given enumeration
2826 element_list_attribute (element)
2827 register tree element;
2829 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2830 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2832 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_element_list);
2833 sprintf (begin_label, EE_BEGIN_LABEL_FMT, current_dienum);
2834 sprintf (end_label, EE_END_LABEL_FMT, current_dienum);
2835 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
2836 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2838 /* Here we output a list of value/name pairs for each enumeration constant
2839 defined for this enumeration type (as required), but we do it in REVERSE
2840 order. The order is the one required by the draft #5 Dwarf specification
2841 published by the UI/PLSIG. */
2843 output_enumeral_list (element); /* Recursively output the whole list. */
2845 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2848 /* Generate an AT_stmt_list attribute. These are normally present only in
2849 DIEs with a TAG_compile_unit tag. */
2852 stmt_list_attribute (label)
2853 register const char *label;
2855 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_stmt_list);
2856 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
2857 ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
2860 /* Generate an AT_low_pc attribute for a label DIE, a lexical_block DIE or
2861 for a subroutine DIE. */
2864 low_pc_attribute (asm_low_label)
2865 register const char *asm_low_label;
2867 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_low_pc);
2868 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_low_label);
2871 /* Generate an AT_high_pc attribute for a lexical_block DIE or for a
2875 high_pc_attribute (asm_high_label)
2876 register const char *asm_high_label;
2878 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_high_pc);
2879 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_high_label);
2882 /* Generate an AT_body_begin attribute for a subroutine DIE. */
2885 body_begin_attribute (asm_begin_label)
2886 register const char *asm_begin_label;
2888 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_body_begin);
2889 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_begin_label);
2892 /* Generate an AT_body_end attribute for a subroutine DIE. */
2895 body_end_attribute (asm_end_label)
2896 register const char *asm_end_label;
2898 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_body_end);
2899 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_end_label);
2902 /* Generate an AT_language attribute given a LANG value. These attributes
2903 are used only within TAG_compile_unit DIEs. */
2906 language_attribute (language_code)
2907 register unsigned language_code;
2909 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_language);
2910 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, language_code);
2914 member_attribute (context)
2915 register tree context;
2917 char label[MAX_ARTIFICIAL_LABEL_BYTES];
2919 /* Generate this attribute only for members in C++. */
2921 if (context != NULL && is_tagged_type (context))
2923 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_member);
2924 sprintf (label, TYPE_NAME_FMT, TYPE_UID (context));
2925 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
2931 string_length_attribute (upper_bound)
2932 register tree upper_bound;
2934 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2935 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2937 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_string_length);
2938 sprintf (begin_label, SL_BEGIN_LABEL_FMT, current_dienum);
2939 sprintf (end_label, SL_END_LABEL_FMT, current_dienum);
2940 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2941 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2942 output_bound_representation (upper_bound, 0, 'u');
2943 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2948 comp_dir_attribute (dirname)
2949 register const char *dirname;
2951 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_comp_dir);
2952 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, dirname);
2956 sf_names_attribute (sf_names_start_label)
2957 register const char *sf_names_start_label;
2959 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sf_names);
2960 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
2961 ASM_OUTPUT_DWARF_ADDR (asm_out_file, sf_names_start_label);
2965 src_info_attribute (src_info_start_label)
2966 register const char *src_info_start_label;
2968 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_info);
2969 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
2970 ASM_OUTPUT_DWARF_ADDR (asm_out_file, src_info_start_label);
2974 mac_info_attribute (mac_info_start_label)
2975 register const char *mac_info_start_label;
2977 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mac_info);
2978 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
2979 ASM_OUTPUT_DWARF_ADDR (asm_out_file, mac_info_start_label);
2983 prototyped_attribute (func_type)
2984 register tree func_type;
2986 if ((strcmp (language_string, "GNU C") == 0)
2987 && (TYPE_ARG_TYPES (func_type) != NULL))
2989 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_prototyped);
2990 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
2995 producer_attribute (producer)
2996 register const char *producer;
2998 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_producer);
2999 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, producer);
3003 inline_attribute (decl)
3006 if (DECL_INLINE (decl))
3008 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_inline);
3009 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3014 containing_type_attribute (containing_type)
3015 register tree containing_type;
3017 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3019 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_containing_type);
3020 sprintf (label, TYPE_NAME_FMT, TYPE_UID (containing_type));
3021 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
3025 abstract_origin_attribute (origin)
3026 register tree origin;
3028 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3030 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_abstract_origin);
3031 switch (TREE_CODE_CLASS (TREE_CODE (origin)))
3034 sprintf (label, DECL_NAME_FMT, DECL_UID (origin));
3038 sprintf (label, TYPE_NAME_FMT, TYPE_UID (origin));
3042 abort (); /* Should never happen. */
3045 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
3048 #ifdef DWARF_DECL_COORDINATES
3050 src_coords_attribute (src_fileno, src_lineno)
3051 register unsigned src_fileno;
3052 register unsigned src_lineno;
3054 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_coords);
3055 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, src_fileno);
3056 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, src_lineno);
3058 #endif /* defined(DWARF_DECL_COORDINATES) */
3061 pure_or_virtual_attribute (func_decl)
3062 register tree func_decl;
3064 if (DECL_VIRTUAL_P (func_decl))
3066 #if 0 /* DECL_ABSTRACT_VIRTUAL_P is C++-specific. */
3067 if (DECL_ABSTRACT_VIRTUAL_P (func_decl))
3068 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_pure_virtual);
3071 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_virtual);
3072 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3076 /************************* end of attributes *****************************/
3078 /********************* utility routines for DIEs *************************/
3080 /* Output an AT_name attribute and an AT_src_coords attribute for the
3081 given decl, but only if it actually has a name. */
3084 name_and_src_coords_attributes (decl)
3087 register tree decl_name = DECL_NAME (decl);
3089 if (decl_name && IDENTIFIER_POINTER (decl_name))
3091 name_attribute (IDENTIFIER_POINTER (decl_name));
3092 #ifdef DWARF_DECL_COORDINATES
3094 register unsigned file_index;
3096 /* This is annoying, but we have to pop out of the .debug section
3097 for a moment while we call `lookup_filename' because calling it
3098 may cause a temporary switch into the .debug_sfnames section and
3099 most svr4 assemblers are not smart enough to be able to nest
3100 section switches to any depth greater than one. Note that we
3101 also can't skirt this issue by delaying all output to the
3102 .debug_sfnames section unit the end of compilation because that
3103 would cause us to have inter-section forward references and
3104 Fred Fish sez that m68k/svr4 assemblers botch those. */
3106 ASM_OUTPUT_POP_SECTION (asm_out_file);
3107 file_index = lookup_filename (DECL_SOURCE_FILE (decl));
3108 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
3110 src_coords_attribute (file_index, DECL_SOURCE_LINE (decl));
3112 #endif /* defined(DWARF_DECL_COORDINATES) */
3116 /* Many forms of DIEs contain a "type description" part. The following
3117 routine writes out these "type descriptor" parts. */
3120 type_attribute (type, decl_const, decl_volatile)
3122 register int decl_const;
3123 register int decl_volatile;
3125 register enum tree_code code = TREE_CODE (type);
3126 register int root_type_modified;
3128 if (code == ERROR_MARK)
3131 /* Handle a special case. For functions whose return type is void,
3132 we generate *no* type attribute. (Note that no object may have
3133 type `void', so this only applies to function return types. */
3135 if (code == VOID_TYPE)
3138 /* If this is a subtype, find the underlying type. Eventually,
3139 this should write out the appropriate subtype info. */
3140 while ((code == INTEGER_TYPE || code == REAL_TYPE)
3141 && TREE_TYPE (type) != 0)
3142 type = TREE_TYPE (type), code = TREE_CODE (type);
3144 root_type_modified = (code == POINTER_TYPE || code == REFERENCE_TYPE
3145 || decl_const || decl_volatile
3146 || TYPE_READONLY (type) || TYPE_VOLATILE (type));
3148 if (type_is_fundamental (root_type (type)))
3150 if (root_type_modified)
3151 mod_fund_type_attribute (type, decl_const, decl_volatile);
3153 fund_type_attribute (fundamental_type_code (type));
3157 if (root_type_modified)
3158 mod_u_d_type_attribute (type, decl_const, decl_volatile);
3160 /* We have to get the type_main_variant here (and pass that to the
3161 `user_def_type_attribute' routine) because the ..._TYPE node we
3162 have might simply be a *copy* of some original type node (where
3163 the copy was created to help us keep track of typedef names)
3164 and that copy might have a different TYPE_UID from the original
3165 ..._TYPE node. (Note that when `equate_type_number_to_die_number'
3166 is labeling a given type DIE for future reference, it always and
3167 only creates labels for DIEs representing *main variants*, and it
3168 never even knows about non-main-variants.) */
3169 user_def_type_attribute (type_main_variant (type));
3173 /* Given a tree pointer to a struct, class, union, or enum type node, return
3174 a pointer to the (string) tag name for the given type, or zero if the
3175 type was declared without a tag. */
3181 register char *name = 0;
3183 if (TYPE_NAME (type) != 0)
3185 register tree t = 0;
3187 /* Find the IDENTIFIER_NODE for the type name. */
3188 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3189 t = TYPE_NAME (type);
3191 /* The g++ front end makes the TYPE_NAME of *each* tagged type point to
3192 a TYPE_DECL node, regardless of whether or not a `typedef' was
3194 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
3195 && ! DECL_IGNORED_P (TYPE_NAME (type)))
3196 t = DECL_NAME (TYPE_NAME (type));
3198 /* Now get the name as a string, or invent one. */
3200 name = IDENTIFIER_POINTER (t);
3203 return (name == 0 || *name == '\0') ? 0 : name;
3209 /* Start by checking if the pending_sibling_stack needs to be expanded.
3210 If necessary, expand it. */
3212 if (pending_siblings == pending_siblings_allocated)
3214 pending_siblings_allocated += PENDING_SIBLINGS_INCREMENT;
3215 pending_sibling_stack
3216 = (unsigned *) xrealloc (pending_sibling_stack,
3217 pending_siblings_allocated * sizeof(unsigned));
3221 NEXT_DIE_NUM = next_unused_dienum++;
3224 /* Pop the sibling stack so that the most recently pushed DIEnum becomes the
3234 member_declared_type (member)
3235 register tree member;
3237 return (DECL_BIT_FIELD_TYPE (member))
3238 ? DECL_BIT_FIELD_TYPE (member)
3239 : TREE_TYPE (member);
3242 /* Get the function's label, as described by its RTL.
3243 This may be different from the DECL_NAME name used
3244 in the source file. */
3247 function_start_label (decl)
3253 x = DECL_RTL (decl);
3254 if (GET_CODE (x) != MEM)
3257 if (GET_CODE (x) != SYMBOL_REF)
3259 fnname = XSTR (x, 0);
3264 /******************************* DIEs ************************************/
3266 /* Output routines for individual types of DIEs. */
3268 /* Note that every type of DIE (except a null DIE) gets a sibling. */
3271 output_array_type_die (arg)
3274 register tree type = arg;
3276 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_array_type);
3277 sibling_attribute ();
3278 equate_type_number_to_die_number (type);
3279 member_attribute (TYPE_CONTEXT (type));
3281 /* I believe that we can default the array ordering. SDB will probably
3282 do the right things even if AT_ordering is not present. It's not
3283 even an issue until we start to get into multidimensional arrays
3284 anyway. If SDB is ever caught doing the Wrong Thing for multi-
3285 dimensional arrays, then we'll have to put the AT_ordering attribute
3286 back in. (But if and when we find out that we need to put these in,
3287 we will only do so for multidimensional arrays. After all, we don't
3288 want to waste space in the .debug section now do we?) */
3290 #ifdef USE_ORDERING_ATTRIBUTE
3291 ordering_attribute (ORD_row_major);
3292 #endif /* defined(USE_ORDERING_ATTRIBUTE) */
3294 subscript_data_attribute (type);
3298 output_set_type_die (arg)
3301 register tree type = arg;
3303 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_set_type);
3304 sibling_attribute ();
3305 equate_type_number_to_die_number (type);
3306 member_attribute (TYPE_CONTEXT (type));
3307 type_attribute (TREE_TYPE (type), 0, 0);
3311 /* Implement this when there is a GNU FORTRAN or GNU Ada front end. */
3314 output_entry_point_die (arg)
3317 register tree decl = arg;
3318 register tree origin = decl_ultimate_origin (decl);
3320 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_entry_point);
3321 sibling_attribute ();
3324 abstract_origin_attribute (origin);
3327 name_and_src_coords_attributes (decl);
3328 member_attribute (DECL_CONTEXT (decl));
3329 type_attribute (TREE_TYPE (TREE_TYPE (decl)), 0, 0);
3331 if (DECL_ABSTRACT (decl))
3332 equate_decl_number_to_die_number (decl);
3334 low_pc_attribute (function_start_label (decl));
3338 /* Output a DIE to represent an inlined instance of an enumeration type. */
3341 output_inlined_enumeration_type_die (arg)
3344 register tree type = arg;
3346 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type);
3347 sibling_attribute ();
3348 if (!TREE_ASM_WRITTEN (type))
3350 abstract_origin_attribute (type);
3353 /* Output a DIE to represent an inlined instance of a structure type. */
3356 output_inlined_structure_type_die (arg)
3359 register tree type = arg;
3361 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_structure_type);
3362 sibling_attribute ();
3363 if (!TREE_ASM_WRITTEN (type))
3365 abstract_origin_attribute (type);
3368 /* Output a DIE to represent an inlined instance of a union type. */
3371 output_inlined_union_type_die (arg)
3374 register tree type = arg;
3376 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_union_type);
3377 sibling_attribute ();
3378 if (!TREE_ASM_WRITTEN (type))
3380 abstract_origin_attribute (type);
3383 /* Output a DIE to represent an enumeration type. Note that these DIEs
3384 include all of the information about the enumeration values also.
3385 This information is encoded into the element_list attribute. */
3388 output_enumeration_type_die (arg)
3391 register tree type = arg;
3393 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type);
3394 sibling_attribute ();
3395 equate_type_number_to_die_number (type);
3396 name_attribute (type_tag (type));
3397 member_attribute (TYPE_CONTEXT (type));
3399 /* Handle a GNU C/C++ extension, i.e. incomplete enum types. If the
3400 given enum type is incomplete, do not generate the AT_byte_size
3401 attribute or the AT_element_list attribute. */
3403 if (TYPE_SIZE (type))
3405 byte_size_attribute (type);
3406 element_list_attribute (TYPE_FIELDS (type));
3410 /* Output a DIE to represent either a real live formal parameter decl or
3411 to represent just the type of some formal parameter position in some
3414 Note that this routine is a bit unusual because its argument may be
3415 a ..._DECL node (i.e. either a PARM_DECL or perhaps a VAR_DECL which
3416 represents an inlining of some PARM_DECL) or else some sort of a
3417 ..._TYPE node. If it's the former then this function is being called
3418 to output a DIE to represent a formal parameter object (or some inlining
3419 thereof). If it's the latter, then this function is only being called
3420 to output a TAG_formal_parameter DIE to stand as a placeholder for some
3421 formal argument type of some subprogram type. */
3424 output_formal_parameter_die (arg)
3427 register tree node = arg;
3429 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_formal_parameter);
3430 sibling_attribute ();
3432 switch (TREE_CODE_CLASS (TREE_CODE (node)))
3434 case 'd': /* We were called with some kind of a ..._DECL node. */
3436 register tree origin = decl_ultimate_origin (node);
3439 abstract_origin_attribute (origin);
3442 name_and_src_coords_attributes (node);
3443 type_attribute (TREE_TYPE (node),
3444 TREE_READONLY (node), TREE_THIS_VOLATILE (node));
3446 if (DECL_ABSTRACT (node))
3447 equate_decl_number_to_die_number (node);
3449 location_or_const_value_attribute (node);
3453 case 't': /* We were called with some kind of a ..._TYPE node. */
3454 type_attribute (node, 0, 0);
3458 abort (); /* Should never happen. */
3462 /* Output a DIE to represent a declared function (either file-scope
3463 or block-local) which has "external linkage" (according to ANSI-C). */
3466 output_global_subroutine_die (arg)
3469 register tree decl = arg;
3470 register tree origin = decl_ultimate_origin (decl);
3472 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_global_subroutine);
3473 sibling_attribute ();
3476 abstract_origin_attribute (origin);
3479 register tree type = TREE_TYPE (decl);
3481 name_and_src_coords_attributes (decl);
3482 inline_attribute (decl);
3483 prototyped_attribute (type);
3484 member_attribute (DECL_CONTEXT (decl));
3485 type_attribute (TREE_TYPE (type), 0, 0);
3486 pure_or_virtual_attribute (decl);
3488 if (DECL_ABSTRACT (decl))
3489 equate_decl_number_to_die_number (decl);
3492 if (! DECL_EXTERNAL (decl) && ! in_class
3493 && decl == current_function_decl)
3495 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3497 low_pc_attribute (function_start_label (decl));
3498 sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number);
3499 high_pc_attribute (label);
3500 if (use_gnu_debug_info_extensions)
3502 sprintf (label, BODY_BEGIN_LABEL_FMT, current_funcdef_number);
3503 body_begin_attribute (label);
3504 sprintf (label, BODY_END_LABEL_FMT, current_funcdef_number);
3505 body_end_attribute (label);
3511 /* Output a DIE to represent a declared data object (either file-scope
3512 or block-local) which has "external linkage" (according to ANSI-C). */
3515 output_global_variable_die (arg)
3518 register tree decl = arg;
3519 register tree origin = decl_ultimate_origin (decl);
3521 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_global_variable);
3522 sibling_attribute ();
3524 abstract_origin_attribute (origin);
3527 name_and_src_coords_attributes (decl);
3528 member_attribute (DECL_CONTEXT (decl));
3529 type_attribute (TREE_TYPE (decl),
3530 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
3532 if (DECL_ABSTRACT (decl))
3533 equate_decl_number_to_die_number (decl);
3536 if (! DECL_EXTERNAL (decl) && ! in_class
3537 && current_function_decl == decl_function_context (decl))
3538 location_or_const_value_attribute (decl);
3543 output_label_die (arg)
3546 register tree decl = arg;
3547 register tree origin = decl_ultimate_origin (decl);
3549 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_label);
3550 sibling_attribute ();
3552 abstract_origin_attribute (origin);
3554 name_and_src_coords_attributes (decl);
3555 if (DECL_ABSTRACT (decl))
3556 equate_decl_number_to_die_number (decl);
3559 register rtx insn = DECL_RTL (decl);
3561 /* Deleted labels are programmer specified labels which have been
3562 eliminated because of various optimisations. We still emit them
3563 here so that it is possible to put breakpoints on them. */
3564 if (GET_CODE (insn) == CODE_LABEL
3565 || ((GET_CODE (insn) == NOTE
3566 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL)))
3568 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3570 /* When optimization is enabled (via -O) some parts of the compiler
3571 (e.g. jump.c and cse.c) may try to delete CODE_LABEL insns which
3572 represent source-level labels which were explicitly declared by
3573 the user. This really shouldn't be happening though, so catch
3574 it if it ever does happen. */
3576 if (INSN_DELETED_P (insn))
3577 abort (); /* Should never happen. */
3579 sprintf (label, INSN_LABEL_FMT, current_funcdef_number,
3580 (unsigned) INSN_UID (insn));
3581 low_pc_attribute (label);
3587 output_lexical_block_die (arg)
3590 register tree stmt = arg;
3592 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_lexical_block);
3593 sibling_attribute ();
3595 if (! BLOCK_ABSTRACT (stmt))
3597 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3598 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3600 sprintf (begin_label, BLOCK_BEGIN_LABEL_FMT, next_block_number);
3601 low_pc_attribute (begin_label);
3602 sprintf (end_label, BLOCK_END_LABEL_FMT, next_block_number);
3603 high_pc_attribute (end_label);
3608 output_inlined_subroutine_die (arg)
3611 register tree stmt = arg;
3613 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_inlined_subroutine);
3614 sibling_attribute ();
3616 abstract_origin_attribute (block_ultimate_origin (stmt));
3617 if (! BLOCK_ABSTRACT (stmt))
3619 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3620 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3622 sprintf (begin_label, BLOCK_BEGIN_LABEL_FMT, next_block_number);
3623 low_pc_attribute (begin_label);
3624 sprintf (end_label, BLOCK_END_LABEL_FMT, next_block_number);
3625 high_pc_attribute (end_label);
3629 /* Output a DIE to represent a declared data object (either file-scope
3630 or block-local) which has "internal linkage" (according to ANSI-C). */
3633 output_local_variable_die (arg)
3636 register tree decl = arg;
3637 register tree origin = decl_ultimate_origin (decl);
3639 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_local_variable);
3640 sibling_attribute ();
3642 abstract_origin_attribute (origin);
3645 name_and_src_coords_attributes (decl);
3646 member_attribute (DECL_CONTEXT (decl));
3647 type_attribute (TREE_TYPE (decl),
3648 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
3650 if (DECL_ABSTRACT (decl))
3651 equate_decl_number_to_die_number (decl);
3653 location_or_const_value_attribute (decl);
3657 output_member_die (arg)
3660 register tree decl = arg;
3662 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_member);
3663 sibling_attribute ();
3664 name_and_src_coords_attributes (decl);
3665 member_attribute (DECL_CONTEXT (decl));
3666 type_attribute (member_declared_type (decl),
3667 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
3668 if (DECL_BIT_FIELD_TYPE (decl)) /* If this is a bit field... */
3670 byte_size_attribute (decl);
3671 bit_size_attribute (decl);
3672 bit_offset_attribute (decl);
3674 data_member_location_attribute (decl);
3678 /* Don't generate either pointer_type DIEs or reference_type DIEs. Use
3679 modified types instead.
3681 We keep this code here just in case these types of DIEs may be
3682 needed to represent certain things in other languages (e.g. Pascal)
3686 output_pointer_type_die (arg)
3689 register tree type = arg;
3691 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_pointer_type);
3692 sibling_attribute ();
3693 equate_type_number_to_die_number (type);
3694 member_attribute (TYPE_CONTEXT (type));
3695 type_attribute (TREE_TYPE (type), 0, 0);
3699 output_reference_type_die (arg)
3702 register tree type = arg;
3704 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_reference_type);
3705 sibling_attribute ();
3706 equate_type_number_to_die_number (type);
3707 member_attribute (TYPE_CONTEXT (type));
3708 type_attribute (TREE_TYPE (type), 0, 0);
3713 output_ptr_to_mbr_type_die (arg)
3716 register tree type = arg;
3718 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_ptr_to_member_type);
3719 sibling_attribute ();
3720 equate_type_number_to_die_number (type);
3721 member_attribute (TYPE_CONTEXT (type));
3722 containing_type_attribute (TYPE_OFFSET_BASETYPE (type));
3723 type_attribute (TREE_TYPE (type), 0, 0);
3727 output_compile_unit_die (arg)
3730 register char *main_input_filename = arg;
3732 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_compile_unit);
3733 sibling_attribute ();
3735 name_attribute (main_input_filename);
3740 sprintf (producer, "%s %s", language_string, version_string);
3741 producer_attribute (producer);
3744 if (strcmp (language_string, "GNU C++") == 0)
3745 language_attribute (LANG_C_PLUS_PLUS);
3746 else if (strcmp (language_string, "GNU Ada") == 0)
3747 language_attribute (LANG_ADA83);
3748 else if (strcmp (language_string, "GNU F77") == 0)
3749 language_attribute (LANG_FORTRAN77);
3750 else if (strcmp (language_string, "GNU Pascal") == 0)
3751 language_attribute (LANG_PASCAL83);
3752 else if (flag_traditional)
3753 language_attribute (LANG_C);
3755 language_attribute (LANG_C89);
3756 low_pc_attribute (TEXT_BEGIN_LABEL);
3757 high_pc_attribute (TEXT_END_LABEL);
3758 if (debug_info_level >= DINFO_LEVEL_NORMAL)
3759 stmt_list_attribute (LINE_BEGIN_LABEL);
3760 last_filename = xstrdup (main_input_filename);
3763 char *wd = getpwd ();
3765 comp_dir_attribute (wd);
3768 if (debug_info_level >= DINFO_LEVEL_NORMAL && use_gnu_debug_info_extensions)
3770 sf_names_attribute (SFNAMES_BEGIN_LABEL);
3771 src_info_attribute (SRCINFO_BEGIN_LABEL);
3772 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
3773 mac_info_attribute (MACINFO_BEGIN_LABEL);
3778 output_string_type_die (arg)
3781 register tree type = arg;
3783 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_string_type);
3784 sibling_attribute ();
3785 equate_type_number_to_die_number (type);
3786 member_attribute (TYPE_CONTEXT (type));
3787 /* this is a fixed length string */
3788 byte_size_attribute (type);
3792 output_inheritance_die (arg)
3795 register tree binfo = arg;
3797 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_inheritance);
3798 sibling_attribute ();
3799 type_attribute (BINFO_TYPE (binfo), 0, 0);
3800 data_member_location_attribute (binfo);
3801 if (TREE_VIA_VIRTUAL (binfo))
3803 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_virtual);
3804 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3806 if (TREE_VIA_PUBLIC (binfo))
3808 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_public);
3809 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3811 else if (TREE_VIA_PROTECTED (binfo))
3813 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_protected);
3814 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3819 output_structure_type_die (arg)
3822 register tree type = arg;
3824 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_structure_type);
3825 sibling_attribute ();
3826 equate_type_number_to_die_number (type);
3827 name_attribute (type_tag (type));
3828 member_attribute (TYPE_CONTEXT (type));
3830 /* If this type has been completed, then give it a byte_size attribute
3831 and prepare to give a list of members. Otherwise, don't do either of
3832 these things. In the latter case, we will not be generating a list
3833 of members (since we don't have any idea what they might be for an
3834 incomplete type). */
3836 if (TYPE_SIZE (type))
3839 byte_size_attribute (type);
3843 /* Output a DIE to represent a declared function (either file-scope
3844 or block-local) which has "internal linkage" (according to ANSI-C). */
3847 output_local_subroutine_die (arg)
3850 register tree decl = arg;
3851 register tree origin = decl_ultimate_origin (decl);
3853 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_subroutine);
3854 sibling_attribute ();
3857 abstract_origin_attribute (origin);
3860 register tree type = TREE_TYPE (decl);
3862 name_and_src_coords_attributes (decl);
3863 inline_attribute (decl);
3864 prototyped_attribute (type);
3865 member_attribute (DECL_CONTEXT (decl));
3866 type_attribute (TREE_TYPE (type), 0, 0);
3867 pure_or_virtual_attribute (decl);
3869 if (DECL_ABSTRACT (decl))
3870 equate_decl_number_to_die_number (decl);
3873 /* Avoid getting screwed up in cases where a function was declared
3874 static but where no definition was ever given for it. */
3876 if (TREE_ASM_WRITTEN (decl))
3878 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3879 low_pc_attribute (function_start_label (decl));
3880 sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number);
3881 high_pc_attribute (label);
3882 if (use_gnu_debug_info_extensions)
3884 sprintf (label, BODY_BEGIN_LABEL_FMT, current_funcdef_number);
3885 body_begin_attribute (label);
3886 sprintf (label, BODY_END_LABEL_FMT, current_funcdef_number);
3887 body_end_attribute (label);
3894 output_subroutine_type_die (arg)
3897 register tree type = arg;
3898 register tree return_type = TREE_TYPE (type);
3900 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_subroutine_type);
3901 sibling_attribute ();
3903 equate_type_number_to_die_number (type);
3904 prototyped_attribute (type);
3905 member_attribute (TYPE_CONTEXT (type));
3906 type_attribute (return_type, 0, 0);
3910 output_typedef_die (arg)
3913 register tree decl = arg;
3914 register tree origin = decl_ultimate_origin (decl);
3916 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_typedef);
3917 sibling_attribute ();
3919 abstract_origin_attribute (origin);
3922 name_and_src_coords_attributes (decl);
3923 member_attribute (DECL_CONTEXT (decl));
3924 type_attribute (TREE_TYPE (decl),
3925 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
3927 if (DECL_ABSTRACT (decl))
3928 equate_decl_number_to_die_number (decl);
3932 output_union_type_die (arg)
3935 register tree type = arg;
3937 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_union_type);
3938 sibling_attribute ();
3939 equate_type_number_to_die_number (type);
3940 name_attribute (type_tag (type));
3941 member_attribute (TYPE_CONTEXT (type));
3943 /* If this type has been completed, then give it a byte_size attribute
3944 and prepare to give a list of members. Otherwise, don't do either of
3945 these things. In the latter case, we will not be generating a list
3946 of members (since we don't have any idea what they might be for an
3947 incomplete type). */
3949 if (TYPE_SIZE (type))
3952 byte_size_attribute (type);
3956 /* Generate a special type of DIE used as a stand-in for a trailing ellipsis
3957 at the end of an (ANSI prototyped) formal parameters list. */
3960 output_unspecified_parameters_die (arg)
3963 register tree decl_or_type = arg;
3965 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_unspecified_parameters);
3966 sibling_attribute ();
3968 /* This kludge is here only for the sake of being compatible with what
3969 the USL CI5 C compiler does. The specification of Dwarf Version 1
3970 doesn't say that TAG_unspecified_parameters DIEs should contain any
3971 attributes other than the AT_sibling attribute, but they are certainly
3972 allowed to contain additional attributes, and the CI5 compiler
3973 generates AT_name, AT_fund_type, and AT_location attributes within
3974 TAG_unspecified_parameters DIEs which appear in the child lists for
3975 DIEs representing function definitions, so we do likewise here. */
3977 if (TREE_CODE (decl_or_type) == FUNCTION_DECL && DECL_INITIAL (decl_or_type))
3979 name_attribute ("...");
3980 fund_type_attribute (FT_pointer);
3981 /* location_attribute (?); */
3986 output_padded_null_die (arg)
3987 register void *arg ATTRIBUTE_UNUSED;
3989 ASM_OUTPUT_ALIGN (asm_out_file, 2); /* 2**2 == 4 */
3992 /*************************** end of DIEs *********************************/
3994 /* Generate some type of DIE. This routine generates the generic outer
3995 wrapper stuff which goes around all types of DIE's (regardless of their
3996 TAGs. All forms of DIEs start with a DIE-specific label, followed by a
3997 DIE-length word, followed by the guts of the DIE itself. After the guts
3998 of the DIE, there must always be a terminator label for the DIE. */
4001 output_die (die_specific_output_function, param)
4002 register void (*die_specific_output_function) PROTO ((void *));
4003 register void *param;
4005 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
4006 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
4008 current_dienum = NEXT_DIE_NUM;
4009 NEXT_DIE_NUM = next_unused_dienum;
4011 sprintf (begin_label, DIE_BEGIN_LABEL_FMT, current_dienum);
4012 sprintf (end_label, DIE_END_LABEL_FMT, current_dienum);
4014 /* Write a label which will act as the name for the start of this DIE. */
4016 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
4018 /* Write the DIE-length word. */
4020 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
4022 /* Fill in the guts of the DIE. */
4024 next_unused_dienum++;
4025 die_specific_output_function (param);
4027 /* Write a label which will act as the name for the end of this DIE. */
4029 ASM_OUTPUT_LABEL (asm_out_file, end_label);
4033 end_sibling_chain ()
4035 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
4037 current_dienum = NEXT_DIE_NUM;
4038 NEXT_DIE_NUM = next_unused_dienum;
4040 sprintf (begin_label, DIE_BEGIN_LABEL_FMT, current_dienum);
4042 /* Write a label which will act as the name for the start of this DIE. */
4044 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
4046 /* Write the DIE-length word. */
4048 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 4);
4053 /* Generate a list of nameless TAG_formal_parameter DIEs (and perhaps a
4054 TAG_unspecified_parameters DIE) to represent the types of the formal
4055 parameters as specified in some function type specification (except
4056 for those which appear as part of a function *definition*).
4058 Note that we must be careful here to output all of the parameter
4059 DIEs *before* we output any DIEs needed to represent the types of
4060 the formal parameters. This keeps svr4 SDB happy because it
4061 (incorrectly) thinks that the first non-parameter DIE it sees ends
4062 the formal parameter list. */
4065 output_formal_types (function_or_method_type)
4066 register tree function_or_method_type;
4069 register tree formal_type = NULL;
4070 register tree first_parm_type = TYPE_ARG_TYPES (function_or_method_type);
4072 /* Set TREE_ASM_WRITTEN while processing the parameters, lest we
4073 get bogus recursion when outputting tagged types local to a
4074 function declaration. */
4075 int save_asm_written = TREE_ASM_WRITTEN (function_or_method_type);
4076 TREE_ASM_WRITTEN (function_or_method_type) = 1;
4078 /* In the case where we are generating a formal types list for a C++
4079 non-static member function type, skip over the first thing on the
4080 TYPE_ARG_TYPES list because it only represents the type of the
4081 hidden `this pointer'. The debugger should be able to figure
4082 out (without being explicitly told) that this non-static member
4083 function type takes a `this pointer' and should be able to figure
4084 what the type of that hidden parameter is from the AT_member
4085 attribute of the parent TAG_subroutine_type DIE. */
4087 if (TREE_CODE (function_or_method_type) == METHOD_TYPE)
4088 first_parm_type = TREE_CHAIN (first_parm_type);
4090 /* Make our first pass over the list of formal parameter types and output
4091 a TAG_formal_parameter DIE for each one. */
4093 for (link = first_parm_type; link; link = TREE_CHAIN (link))
4095 formal_type = TREE_VALUE (link);
4096 if (formal_type == void_type_node)
4099 /* Output a (nameless) DIE to represent the formal parameter itself. */
4101 output_die (output_formal_parameter_die, formal_type);
4104 /* If this function type has an ellipsis, add a TAG_unspecified_parameters
4105 DIE to the end of the parameter list. */
4107 if (formal_type != void_type_node)
4108 output_die (output_unspecified_parameters_die, function_or_method_type);
4110 /* Make our second (and final) pass over the list of formal parameter types
4111 and output DIEs to represent those types (as necessary). */
4113 for (link = TYPE_ARG_TYPES (function_or_method_type);
4115 link = TREE_CHAIN (link))
4117 formal_type = TREE_VALUE (link);
4118 if (formal_type == void_type_node)
4121 output_type (formal_type, function_or_method_type);
4124 TREE_ASM_WRITTEN (function_or_method_type) = save_asm_written;
4127 /* Remember a type in the pending_types_list. */
4133 if (pending_types == pending_types_allocated)
4135 pending_types_allocated += PENDING_TYPES_INCREMENT;
4137 = (tree *) xrealloc (pending_types_list,
4138 sizeof (tree) * pending_types_allocated);
4140 pending_types_list[pending_types++] = type;
4142 /* Mark the pending type as having been output already (even though
4143 it hasn't been). This prevents the type from being added to the
4144 pending_types_list more than once. */
4146 TREE_ASM_WRITTEN (type) = 1;
4149 /* Return non-zero if it is legitimate to output DIEs to represent a
4150 given type while we are generating the list of child DIEs for some
4151 DIE (e.g. a function or lexical block DIE) associated with a given scope.
4153 See the comments within the function for a description of when it is
4154 considered legitimate to output DIEs for various kinds of types.
4156 Note that TYPE_CONTEXT(type) may be NULL (to indicate global scope)
4157 or it may point to a BLOCK node (for types local to a block), or to a
4158 FUNCTION_DECL node (for types local to the heading of some function
4159 definition), or to a FUNCTION_TYPE node (for types local to the
4160 prototyped parameter list of a function type specification), or to a
4161 RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE node
4162 (in the case of C++ nested types).
4164 The `scope' parameter should likewise be NULL or should point to a
4165 BLOCK node, a FUNCTION_DECL node, a FUNCTION_TYPE node, a RECORD_TYPE
4166 node, a UNION_TYPE node, or a QUAL_UNION_TYPE node.
4168 This function is used only for deciding when to "pend" and when to
4169 "un-pend" types to/from the pending_types_list.
4171 Note that we sometimes make use of this "type pending" feature in a
4172 rather twisted way to temporarily delay the production of DIEs for the
4173 types of formal parameters. (We do this just to make svr4 SDB happy.)
4174 It order to delay the production of DIEs representing types of formal
4175 parameters, callers of this function supply `fake_containing_scope' as
4176 the `scope' parameter to this function. Given that fake_containing_scope
4177 is a tagged type which is *not* the containing scope for *any* other type,
4178 the desired effect is achieved, i.e. output of DIEs representing types
4179 is temporarily suspended, and any type DIEs which would have otherwise
4180 been output are instead placed onto the pending_types_list. Later on,
4181 we force these (temporarily pended) types to be output simply by calling
4182 `output_pending_types_for_scope' with an actual argument equal to the
4183 true scope of the types we temporarily pended. */
4186 type_ok_for_scope (type, scope)
4188 register tree scope;
4190 /* Tagged types (i.e. struct, union, and enum types) must always be
4191 output only in the scopes where they actually belong (or else the
4192 scoping of their own tag names and the scoping of their member
4193 names will be incorrect). Non-tagged-types on the other hand can
4194 generally be output anywhere, except that svr4 SDB really doesn't
4195 want to see them nested within struct or union types, so here we
4196 say it is always OK to immediately output any such a (non-tagged)
4197 type, so long as we are not within such a context. Note that the
4198 only kinds of non-tagged types which we will be dealing with here
4199 (for C and C++ anyway) will be array types and function types. */
4201 return is_tagged_type (type)
4202 ? (TYPE_CONTEXT (type) == scope
4203 /* Ignore namespaces for the moment. */
4204 || (scope == NULL_TREE
4205 && TREE_CODE (TYPE_CONTEXT (type)) == NAMESPACE_DECL)
4206 || (scope == NULL_TREE && is_tagged_type (TYPE_CONTEXT (type))
4207 && TREE_ASM_WRITTEN (TYPE_CONTEXT (type))))
4208 : (scope == NULL_TREE || ! is_tagged_type (scope));
4211 /* Output any pending types (from the pending_types list) which we can output
4212 now (taking into account the scope that we are working on now).
4214 For each type output, remove the given type from the pending_types_list
4215 *before* we try to output it.
4217 Note that we have to process the list in beginning-to-end order,
4218 because the call made here to output_type may cause yet more types
4219 to be added to the end of the list, and we may have to output some
4223 output_pending_types_for_scope (containing_scope)
4224 register tree containing_scope;
4226 register unsigned i;
4228 for (i = 0; i < pending_types; )
4230 register tree type = pending_types_list[i];
4232 if (type_ok_for_scope (type, containing_scope))
4234 register tree *mover;
4235 register tree *limit;
4238 limit = &pending_types_list[pending_types];
4239 for (mover = &pending_types_list[i]; mover < limit; mover++)
4240 *mover = *(mover+1);
4242 /* Un-mark the type as having been output already (because it
4243 hasn't been, really). Then call output_type to generate a
4244 Dwarf representation of it. */
4246 TREE_ASM_WRITTEN (type) = 0;
4247 output_type (type, containing_scope);
4249 /* Don't increment the loop counter in this case because we
4250 have shifted all of the subsequent pending types down one
4251 element in the pending_types_list array. */
4258 /* Remember a type in the incomplete_types_list. */
4261 add_incomplete_type (type)
4264 if (incomplete_types == incomplete_types_allocated)
4266 incomplete_types_allocated += INCOMPLETE_TYPES_INCREMENT;
4267 incomplete_types_list
4268 = (tree *) xrealloc (incomplete_types_list,
4269 sizeof (tree) * incomplete_types_allocated);
4272 incomplete_types_list[incomplete_types++] = type;
4275 /* Walk through the list of incomplete types again, trying once more to
4276 emit full debugging info for them. */
4279 retry_incomplete_types ()
4284 while (incomplete_types)
4287 type = incomplete_types_list[incomplete_types];
4288 output_type (type, NULL_TREE);
4293 output_type (type, containing_scope)
4295 register tree containing_scope;
4297 if (type == 0 || type == error_mark_node)
4300 /* We are going to output a DIE to represent the unqualified version of
4301 this type (i.e. without any const or volatile qualifiers) so get
4302 the main variant (i.e. the unqualified version) of this type now. */
4304 type = type_main_variant (type);
4306 if (TREE_ASM_WRITTEN (type))
4308 if (finalizing && AGGREGATE_TYPE_P (type))
4310 register tree member;
4312 /* Some of our nested types might not have been defined when we
4313 were written out before; force them out now. */
4315 for (member = TYPE_FIELDS (type); member;
4316 member = TREE_CHAIN (member))
4317 if (TREE_CODE (member) == TYPE_DECL
4318 && ! TREE_ASM_WRITTEN (TREE_TYPE (member)))
4319 output_type (TREE_TYPE (member), containing_scope);
4324 /* If this is a nested type whose containing class hasn't been
4325 written out yet, writing it out will cover this one, too. */
4327 if (TYPE_CONTEXT (type)
4328 && TREE_CODE_CLASS (TREE_CODE (TYPE_CONTEXT (type))) == 't'
4329 && ! TREE_ASM_WRITTEN (TYPE_CONTEXT (type)))
4331 output_type (TYPE_CONTEXT (type), containing_scope);
4335 /* Don't generate any DIEs for this type now unless it is OK to do so
4336 (based upon what `type_ok_for_scope' tells us). */
4338 if (! type_ok_for_scope (type, containing_scope))
4344 switch (TREE_CODE (type))
4350 case REFERENCE_TYPE:
4351 /* Prevent infinite recursion in cases where this is a recursive
4352 type. Recursive types are possible in Ada. */
4353 TREE_ASM_WRITTEN (type) = 1;
4354 /* For these types, all that is required is that we output a DIE
4355 (or a set of DIEs) to represent the "basis" type. */
4356 output_type (TREE_TYPE (type), containing_scope);
4360 /* This code is used for C++ pointer-to-data-member types. */
4361 /* Output a description of the relevant class type. */
4362 output_type (TYPE_OFFSET_BASETYPE (type), containing_scope);
4363 /* Output a description of the type of the object pointed to. */
4364 output_type (TREE_TYPE (type), containing_scope);
4365 /* Now output a DIE to represent this pointer-to-data-member type
4367 output_die (output_ptr_to_mbr_type_die, type);
4371 output_type (TYPE_DOMAIN (type), containing_scope);
4372 output_die (output_set_type_die, type);
4376 output_type (TREE_TYPE (type), containing_scope);
4377 abort (); /* No way to represent these in Dwarf yet! */
4381 /* Force out return type (in case it wasn't forced out already). */
4382 output_type (TREE_TYPE (type), containing_scope);
4383 output_die (output_subroutine_type_die, type);
4384 output_formal_types (type);
4385 end_sibling_chain ();
4389 /* Force out return type (in case it wasn't forced out already). */
4390 output_type (TREE_TYPE (type), containing_scope);
4391 output_die (output_subroutine_type_die, type);
4392 output_formal_types (type);
4393 end_sibling_chain ();
4397 if (TYPE_STRING_FLAG (type) && TREE_CODE(TREE_TYPE(type)) == CHAR_TYPE)
4399 output_type (TREE_TYPE (type), containing_scope);
4400 output_die (output_string_type_die, type);
4404 register tree element_type;
4406 element_type = TREE_TYPE (type);
4407 while (TREE_CODE (element_type) == ARRAY_TYPE)
4408 element_type = TREE_TYPE (element_type);
4410 output_type (element_type, containing_scope);
4411 output_die (output_array_type_die, type);
4418 case QUAL_UNION_TYPE:
4420 /* For a non-file-scope tagged type, we can always go ahead and
4421 output a Dwarf description of this type right now, even if
4422 the type in question is still incomplete, because if this
4423 local type *was* ever completed anywhere within its scope,
4424 that complete definition would already have been attached to
4425 this RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE or ENUMERAL_TYPE
4426 node by the time we reach this point. That's true because of the
4427 way the front-end does its processing of file-scope declarations (of
4428 functions and class types) within which other types might be
4429 nested. The C and C++ front-ends always gobble up such "local
4430 scope" things en-mass before they try to output *any* debugging
4431 information for any of the stuff contained inside them and thus,
4432 we get the benefit here of what is (in effect) a pre-resolution
4433 of forward references to tagged types in local scopes.
4435 Note however that for file-scope tagged types we cannot assume
4436 that such pre-resolution of forward references has taken place.
4437 A given file-scope tagged type may appear to be incomplete when
4438 we reach this point, but it may yet be given a full definition
4439 (at file-scope) later on during compilation. In order to avoid
4440 generating a premature (and possibly incorrect) set of Dwarf
4441 DIEs for such (as yet incomplete) file-scope tagged types, we
4442 generate nothing at all for as-yet incomplete file-scope tagged
4443 types here unless we are making our special "finalization" pass
4444 for file-scope things at the very end of compilation. At that
4445 time, we will certainly know as much about each file-scope tagged
4446 type as we are ever going to know, so at that point in time, we
4447 can safely generate correct Dwarf descriptions for these file-
4448 scope tagged types. */
4450 if (TYPE_SIZE (type) == 0
4451 && (TYPE_CONTEXT (type) == NULL
4452 || AGGREGATE_TYPE_P (TYPE_CONTEXT (type))
4453 || TREE_CODE (TYPE_CONTEXT (type)) == NAMESPACE_DECL)
4456 /* We can't do this for function-local types, and we don't need
4458 if (TREE_PERMANENT (type))
4459 add_incomplete_type (type);
4460 return; /* EARLY EXIT! Avoid setting TREE_ASM_WRITTEN. */
4463 /* Prevent infinite recursion in cases where the type of some
4464 member of this type is expressed in terms of this type itself. */
4466 TREE_ASM_WRITTEN (type) = 1;
4468 /* Output a DIE to represent the tagged type itself. */
4470 switch (TREE_CODE (type))
4473 output_die (output_enumeration_type_die, type);
4474 return; /* a special case -- nothing left to do so just return */
4477 output_die (output_structure_type_die, type);
4481 case QUAL_UNION_TYPE:
4482 output_die (output_union_type_die, type);
4486 abort (); /* Should never happen. */
4489 /* If this is not an incomplete type, output descriptions of
4490 each of its members.
4492 Note that as we output the DIEs necessary to represent the
4493 members of this record or union type, we will also be trying
4494 to output DIEs to represent the *types* of those members.
4495 However the `output_type' function (above) will specifically
4496 avoid generating type DIEs for member types *within* the list
4497 of member DIEs for this (containing) type execpt for those
4498 types (of members) which are explicitly marked as also being
4499 members of this (containing) type themselves. The g++ front-
4500 end can force any given type to be treated as a member of some
4501 other (containing) type by setting the TYPE_CONTEXT of the
4502 given (member) type to point to the TREE node representing the
4503 appropriate (containing) type.
4506 if (TYPE_SIZE (type))
4508 /* First output info about the base classes. */
4509 if (TYPE_BINFO (type) && TYPE_BINFO_BASETYPES (type))
4511 register tree bases = TYPE_BINFO_BASETYPES (type);
4512 register int n_bases = TREE_VEC_LENGTH (bases);
4515 for (i = 0; i < n_bases; i++)
4517 tree binfo = TREE_VEC_ELT (bases, i);
4518 output_type (BINFO_TYPE (binfo), containing_scope);
4519 output_die (output_inheritance_die, binfo);
4526 register tree normal_member;
4528 /* Now output info about the data members and type members. */
4530 for (normal_member = TYPE_FIELDS (type);
4532 normal_member = TREE_CHAIN (normal_member))
4533 output_decl (normal_member, type);
4537 register tree func_member;
4539 /* Now output info about the function members (if any). */
4541 for (func_member = TYPE_METHODS (type);
4543 func_member = TREE_CHAIN (func_member))
4544 output_decl (func_member, type);
4549 /* RECORD_TYPEs, UNION_TYPEs, and QUAL_UNION_TYPEs are themselves
4550 scopes (at least in C++) so we must now output any nested
4551 pending types which are local just to this type. */
4553 output_pending_types_for_scope (type);
4555 end_sibling_chain (); /* Terminate member chain. */
4566 break; /* No DIEs needed for fundamental types. */
4568 case LANG_TYPE: /* No Dwarf representation currently defined. */
4575 TREE_ASM_WRITTEN (type) = 1;
4579 output_tagged_type_instantiation (type)
4582 if (type == 0 || type == error_mark_node)
4585 /* We are going to output a DIE to represent the unqualified version of
4586 this type (i.e. without any const or volatile qualifiers) so make
4587 sure that we have the main variant (i.e. the unqualified version) of
4590 if (type != type_main_variant (type))
4593 if (!TREE_ASM_WRITTEN (type))
4596 switch (TREE_CODE (type))
4602 output_die (output_inlined_enumeration_type_die, type);
4606 output_die (output_inlined_structure_type_die, type);
4610 case QUAL_UNION_TYPE:
4611 output_die (output_inlined_union_type_die, type);
4615 abort (); /* Should never happen. */
4619 /* Output a TAG_lexical_block DIE followed by DIEs to represent all of
4620 the things which are local to the given block. */
4623 output_block (stmt, depth)
4627 register int must_output_die = 0;
4628 register tree origin;
4629 register enum tree_code origin_code;
4631 /* Ignore blocks never really used to make RTL. */
4633 if (! stmt || ! TREE_USED (stmt))
4636 /* Determine the "ultimate origin" of this block. This block may be an
4637 inlined instance of an inlined instance of inline function, so we
4638 have to trace all of the way back through the origin chain to find
4639 out what sort of node actually served as the original seed for the
4640 creation of the current block. */
4642 origin = block_ultimate_origin (stmt);
4643 origin_code = (origin != NULL) ? TREE_CODE (origin) : ERROR_MARK;
4645 /* Determine if we need to output any Dwarf DIEs at all to represent this
4648 if (origin_code == FUNCTION_DECL)
4649 /* The outer scopes for inlinings *must* always be represented. We
4650 generate TAG_inlined_subroutine DIEs for them. (See below.) */
4651 must_output_die = 1;
4654 /* In the case where the current block represents an inlining of the
4655 "body block" of an inline function, we must *NOT* output any DIE
4656 for this block because we have already output a DIE to represent
4657 the whole inlined function scope and the "body block" of any
4658 function doesn't really represent a different scope according to
4659 ANSI C rules. So we check here to make sure that this block does
4660 not represent a "body block inlining" before trying to set the
4661 `must_output_die' flag. */
4663 if (! is_body_block (origin ? origin : stmt))
4665 /* Determine if this block directly contains any "significant"
4666 local declarations which we will need to output DIEs for. */
4668 if (debug_info_level > DINFO_LEVEL_TERSE)
4669 /* We are not in terse mode so *any* local declaration counts
4670 as being a "significant" one. */
4671 must_output_die = (BLOCK_VARS (stmt) != NULL);
4676 /* We are in terse mode, so only local (nested) function
4677 definitions count as "significant" local declarations. */
4679 for (decl = BLOCK_VARS (stmt); decl; decl = TREE_CHAIN (decl))
4680 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
4682 must_output_die = 1;
4689 /* It would be a waste of space to generate a Dwarf TAG_lexical_block
4690 DIE for any block which contains no significant local declarations
4691 at all. Rather, in such cases we just call `output_decls_for_scope'
4692 so that any needed Dwarf info for any sub-blocks will get properly
4693 generated. Note that in terse mode, our definition of what constitutes
4694 a "significant" local declaration gets restricted to include only
4695 inlined function instances and local (nested) function definitions. */
4697 if (origin_code == FUNCTION_DECL && BLOCK_ABSTRACT (stmt))
4698 /* We don't care about an abstract inlined subroutine. */;
4699 else if (must_output_die)
4701 output_die ((origin_code == FUNCTION_DECL)
4702 ? output_inlined_subroutine_die
4703 : output_lexical_block_die,
4705 output_decls_for_scope (stmt, depth);
4706 end_sibling_chain ();
4709 output_decls_for_scope (stmt, depth);
4712 /* Output all of the decls declared within a given scope (also called
4713 a `binding contour') and (recursively) all of it's sub-blocks. */
4716 output_decls_for_scope (stmt, depth)
4720 /* Ignore blocks never really used to make RTL. */
4722 if (! stmt || ! TREE_USED (stmt))
4725 if (! BLOCK_ABSTRACT (stmt) && depth > 0)
4726 next_block_number++;
4728 /* Output the DIEs to represent all of the data objects, functions,
4729 typedefs, and tagged types declared directly within this block
4730 but not within any nested sub-blocks. */
4735 for (decl = BLOCK_VARS (stmt); decl; decl = TREE_CHAIN (decl))
4736 output_decl (decl, stmt);
4739 output_pending_types_for_scope (stmt);
4741 /* Output the DIEs to represent all sub-blocks (and the items declared
4742 therein) of this block. */
4745 register tree subblocks;
4747 for (subblocks = BLOCK_SUBBLOCKS (stmt);
4749 subblocks = BLOCK_CHAIN (subblocks))
4750 output_block (subblocks, depth + 1);
4754 /* Is this a typedef we can avoid emitting? */
4757 is_redundant_typedef (decl)
4760 if (TYPE_DECL_IS_STUB (decl))
4762 if (DECL_ARTIFICIAL (decl)
4763 && DECL_CONTEXT (decl)
4764 && is_tagged_type (DECL_CONTEXT (decl))
4765 && TREE_CODE (TYPE_NAME (DECL_CONTEXT (decl))) == TYPE_DECL
4766 && DECL_NAME (decl) == DECL_NAME (TYPE_NAME (DECL_CONTEXT (decl))))
4767 /* Also ignore the artificial member typedef for the class name. */
4772 /* Output Dwarf .debug information for a decl described by DECL. */
4775 output_decl (decl, containing_scope)
4777 register tree containing_scope;
4779 /* Make a note of the decl node we are going to be working on. We may
4780 need to give the user the source coordinates of where it appeared in
4781 case we notice (later on) that something about it looks screwy. */
4783 dwarf_last_decl = decl;
4785 if (TREE_CODE (decl) == ERROR_MARK)
4788 /* If a structure is declared within an initialization, e.g. as the
4789 operand of a sizeof, then it will not have a name. We don't want
4790 to output a DIE for it, as the tree nodes are in the temporary obstack */
4792 if ((TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
4793 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE)
4794 && ((DECL_NAME (decl) == 0 && TYPE_NAME (TREE_TYPE (decl)) == 0)
4795 || (TYPE_FIELDS (TREE_TYPE (decl))
4796 && (TREE_CODE (TYPE_FIELDS (TREE_TYPE (decl))) == ERROR_MARK))))
4799 /* If this ..._DECL node is marked to be ignored, then ignore it.
4800 But don't ignore a function definition, since that would screw
4801 up our count of blocks, and that it turn will completely screw up the
4802 labels we will reference in subsequent AT_low_pc and AT_high_pc
4803 attributes (for subsequent blocks). */
4805 if (DECL_IGNORED_P (decl) && TREE_CODE (decl) != FUNCTION_DECL)
4808 switch (TREE_CODE (decl))
4811 /* The individual enumerators of an enum type get output when we
4812 output the Dwarf representation of the relevant enum type itself. */
4816 /* If we are in terse mode, don't output any DIEs to represent
4817 mere function declarations. Also, if we are conforming
4818 to the DWARF version 1 specification, don't output DIEs for
4819 mere function declarations. */
4821 if (DECL_INITIAL (decl) == NULL_TREE)
4822 #if (DWARF_VERSION > 1)
4823 if (debug_info_level <= DINFO_LEVEL_TERSE)
4827 /* Before we describe the FUNCTION_DECL itself, make sure that we
4828 have described its return type. */
4830 output_type (TREE_TYPE (TREE_TYPE (decl)), containing_scope);
4833 /* And its containing type. */
4834 register tree origin = decl_class_context (decl);
4836 output_type (origin, containing_scope);
4839 /* If the following DIE will represent a function definition for a
4840 function with "extern" linkage, output a special "pubnames" DIE
4841 label just ahead of the actual DIE. A reference to this label
4842 was already generated in the .debug_pubnames section sub-entry
4843 for this function definition. */
4845 if (TREE_PUBLIC (decl))
4847 char label[MAX_ARTIFICIAL_LABEL_BYTES];
4849 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number++);
4850 ASM_OUTPUT_LABEL (asm_out_file, label);
4853 /* Now output a DIE to represent the function itself. */
4855 output_die (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)
4856 ? output_global_subroutine_die
4857 : output_local_subroutine_die,
4860 /* Now output descriptions of the arguments for this function.
4861 This gets (unnecessarily?) complex because of the fact that
4862 the DECL_ARGUMENT list for a FUNCTION_DECL doesn't indicate
4863 cases where there was a trailing `...' at the end of the formal
4864 parameter list. In order to find out if there was a trailing
4865 ellipsis or not, we must instead look at the type associated
4866 with the FUNCTION_DECL. This will be a node of type FUNCTION_TYPE.
4867 If the chain of type nodes hanging off of this FUNCTION_TYPE node
4868 ends with a void_type_node then there should *not* be an ellipsis
4871 /* In the case where we are describing a mere function declaration, all
4872 we need to do here (and all we *can* do here) is to describe
4873 the *types* of its formal parameters. */
4875 if (decl != current_function_decl || in_class)
4876 output_formal_types (TREE_TYPE (decl));
4879 /* Generate DIEs to represent all known formal parameters */
4881 register tree arg_decls = DECL_ARGUMENTS (decl);
4884 /* WARNING! Kludge zone ahead! Here we have a special
4885 hack for svr4 SDB compatibility. Instead of passing the
4886 current FUNCTION_DECL node as the second parameter (i.e.
4887 the `containing_scope' parameter) to `output_decl' (as
4888 we ought to) we instead pass a pointer to our own private
4889 fake_containing_scope node. That node is a RECORD_TYPE
4890 node which NO OTHER TYPE may ever actually be a member of.
4892 This pointer will ultimately get passed into `output_type'
4893 as its `containing_scope' parameter. `Output_type' will
4894 then perform its part in the hack... i.e. it will pend
4895 the type of the formal parameter onto the pending_types
4896 list. Later on, when we are done generating the whole
4897 sequence of formal parameter DIEs for this function
4898 definition, we will un-pend all previously pended types
4899 of formal parameters for this function definition.
4901 This whole kludge prevents any type DIEs from being
4902 mixed in with the formal parameter DIEs. That's good
4903 because svr4 SDB believes that the list of formal
4904 parameter DIEs for a function ends wherever the first
4905 non-formal-parameter DIE appears. Thus, we have to
4906 keep the formal parameter DIEs segregated. They must
4907 all appear (consecutively) at the start of the list of
4908 children for the DIE representing the function definition.
4909 Then (and only then) may we output any additional DIEs
4910 needed to represent the types of these formal parameters.
4914 When generating DIEs, generate the unspecified_parameters
4915 DIE instead if we come across the arg "__builtin_va_alist"
4918 for (parm = arg_decls; parm; parm = TREE_CHAIN (parm))
4919 if (TREE_CODE (parm) == PARM_DECL)
4921 if (DECL_NAME(parm) &&
4922 !strcmp(IDENTIFIER_POINTER(DECL_NAME(parm)),
4923 "__builtin_va_alist") )
4924 output_die (output_unspecified_parameters_die, decl);
4926 output_decl (parm, fake_containing_scope);
4930 Now that we have finished generating all of the DIEs to
4931 represent the formal parameters themselves, force out
4932 any DIEs needed to represent their types. We do this
4933 simply by un-pending all previously pended types which
4934 can legitimately go into the chain of children DIEs for
4935 the current FUNCTION_DECL.
4938 output_pending_types_for_scope (decl);
4941 Decide whether we need a unspecified_parameters DIE at the end.
4942 There are 2 more cases to do this for:
4943 1) the ansi ... declaration - this is detectable when the end
4944 of the arg list is not a void_type_node
4945 2) an unprototyped function declaration (not a definition). This
4946 just means that we have no info about the parameters at all.
4950 register tree fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
4954 /* this is the prototyped case, check for ... */
4955 if (TREE_VALUE (tree_last (fn_arg_types)) != void_type_node)
4956 output_die (output_unspecified_parameters_die, decl);
4960 /* this is unprototyped, check for undefined (just declaration) */
4961 if (!DECL_INITIAL (decl))
4962 output_die (output_unspecified_parameters_die, decl);
4966 /* Output Dwarf info for all of the stuff within the body of the
4967 function (if it has one - it may be just a declaration). */
4970 register tree outer_scope = DECL_INITIAL (decl);
4972 if (outer_scope && TREE_CODE (outer_scope) != ERROR_MARK)
4974 /* Note that here, `outer_scope' is a pointer to the outermost
4975 BLOCK node created to represent a function.
4976 This outermost BLOCK actually represents the outermost
4977 binding contour for the function, i.e. the contour in which
4978 the function's formal parameters and labels get declared.
4980 Curiously, it appears that the front end doesn't actually
4981 put the PARM_DECL nodes for the current function onto the
4982 BLOCK_VARS list for this outer scope. (They are strung
4983 off of the DECL_ARGUMENTS list for the function instead.)
4984 The BLOCK_VARS list for the `outer_scope' does provide us
4985 with a list of the LABEL_DECL nodes for the function however,
4986 and we output DWARF info for those here.
4988 Just within the `outer_scope' there will be a BLOCK node
4989 representing the function's outermost pair of curly braces,
4990 and any blocks used for the base and member initializers of
4991 a C++ constructor function. */
4993 output_decls_for_scope (outer_scope, 0);
4995 /* Finally, force out any pending types which are local to the
4996 outermost block of this function definition. These will
4997 all have a TYPE_CONTEXT which points to the FUNCTION_DECL
5000 output_pending_types_for_scope (decl);
5005 /* Generate a terminator for the list of stuff `owned' by this
5008 end_sibling_chain ();
5013 /* If we are in terse mode, don't generate any DIEs to represent
5014 any actual typedefs. Note that even when we are in terse mode,
5015 we must still output DIEs to represent those tagged types which
5016 are used (directly or indirectly) in the specification of either
5017 a return type or a formal parameter type of some function. */
5019 if (debug_info_level <= DINFO_LEVEL_TERSE)
5020 if (! TYPE_DECL_IS_STUB (decl)
5021 || (! TYPE_USED_FOR_FUNCTION (TREE_TYPE (decl)) && ! in_class))
5024 /* In the special case of a TYPE_DECL node representing
5025 the declaration of some type tag, if the given TYPE_DECL is
5026 marked as having been instantiated from some other (original)
5027 TYPE_DECL node (e.g. one which was generated within the original
5028 definition of an inline function) we have to generate a special
5029 (abbreviated) TAG_structure_type, TAG_union_type, or
5030 TAG_enumeration-type DIE here. */
5032 if (TYPE_DECL_IS_STUB (decl) && DECL_ABSTRACT_ORIGIN (decl))
5034 output_tagged_type_instantiation (TREE_TYPE (decl));
5038 output_type (TREE_TYPE (decl), containing_scope);
5040 if (! is_redundant_typedef (decl))
5041 /* Output a DIE to represent the typedef itself. */
5042 output_die (output_typedef_die, decl);
5046 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5047 output_die (output_label_die, decl);
5051 /* If we are conforming to the DWARF version 1 specification, don't
5052 generated any DIEs to represent mere external object declarations. */
5054 #if (DWARF_VERSION <= 1)
5055 if (DECL_EXTERNAL (decl) && ! TREE_PUBLIC (decl))
5059 /* If we are in terse mode, don't generate any DIEs to represent
5060 any variable declarations or definitions. */
5062 if (debug_info_level <= DINFO_LEVEL_TERSE)
5065 /* Output any DIEs that are needed to specify the type of this data
5068 output_type (TREE_TYPE (decl), containing_scope);
5071 /* And its containing type. */
5072 register tree origin = decl_class_context (decl);
5074 output_type (origin, containing_scope);
5077 /* If the following DIE will represent a data object definition for a
5078 data object with "extern" linkage, output a special "pubnames" DIE
5079 label just ahead of the actual DIE. A reference to this label
5080 was already generated in the .debug_pubnames section sub-entry
5081 for this data object definition. */
5083 if (TREE_PUBLIC (decl) && ! DECL_ABSTRACT (decl))
5085 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5087 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number++);
5088 ASM_OUTPUT_LABEL (asm_out_file, label);
5091 /* Now output the DIE to represent the data object itself. This gets
5092 complicated because of the possibility that the VAR_DECL really
5093 represents an inlined instance of a formal parameter for an inline
5097 register void (*func) PROTO((void *));
5098 register tree origin = decl_ultimate_origin (decl);
5100 if (origin != NULL && TREE_CODE (origin) == PARM_DECL)
5101 func = output_formal_parameter_die;
5104 if (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
5105 func = output_global_variable_die;
5107 func = output_local_variable_die;
5109 output_die (func, decl);
5114 /* Ignore the nameless fields that are used to skip bits. */
5115 if (DECL_NAME (decl) != 0)
5117 output_type (member_declared_type (decl), containing_scope);
5118 output_die (output_member_die, decl);
5123 /* Force out the type of this formal, if it was not forced out yet.
5124 Note that here we can run afowl of a bug in "classic" svr4 SDB.
5125 It should be able to grok the presence of type DIEs within a list
5126 of TAG_formal_parameter DIEs, but it doesn't. */
5128 output_type (TREE_TYPE (decl), containing_scope);
5129 output_die (output_formal_parameter_die, decl);
5138 dwarfout_file_scope_decl (decl, set_finalizing)
5140 register int set_finalizing;
5142 if (TREE_CODE (decl) == ERROR_MARK)
5145 /* If this ..._DECL node is marked to be ignored, then ignore it. We
5146 gotta hope that the node in question doesn't represent a function
5147 definition. If it does, then totally ignoring it is bound to screw
5148 up our count of blocks, and that it turn will completely screw up the
5149 labels we will reference in subsequent AT_low_pc and AT_high_pc
5150 attributes (for subsequent blocks). (It's too bad that BLOCK nodes
5151 don't carry their own sequence numbers with them!) */
5153 if (DECL_IGNORED_P (decl))
5155 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl) != NULL)
5160 switch (TREE_CODE (decl))
5164 /* Ignore this FUNCTION_DECL if it refers to a builtin declaration of
5165 a builtin function. Explicit programmer-supplied declarations of
5166 these same functions should NOT be ignored however. */
5168 if (DECL_EXTERNAL (decl) && DECL_FUNCTION_CODE (decl))
5171 /* What we would really like to do here is to filter out all mere
5172 file-scope declarations of file-scope functions which are never
5173 referenced later within this translation unit (and keep all of
5174 ones that *are* referenced later on) but we aren't clairvoyant,
5175 so we have no idea which functions will be referenced in the
5176 future (i.e. later on within the current translation unit).
5177 So here we just ignore all file-scope function declarations
5178 which are not also definitions. If and when the debugger needs
5179 to know something about these functions, it wil have to hunt
5180 around and find the DWARF information associated with the
5181 *definition* of the function.
5183 Note that we can't just check `DECL_EXTERNAL' to find out which
5184 FUNCTION_DECL nodes represent definitions and which ones represent
5185 mere declarations. We have to check `DECL_INITIAL' instead. That's
5186 because the C front-end supports some weird semantics for "extern
5187 inline" function definitions. These can get inlined within the
5188 current translation unit (an thus, we need to generate DWARF info
5189 for their abstract instances so that the DWARF info for the
5190 concrete inlined instances can have something to refer to) but
5191 the compiler never generates any out-of-lines instances of such
5192 things (despite the fact that they *are* definitions). The
5193 important point is that the C front-end marks these "extern inline"
5194 functions as DECL_EXTERNAL, but we need to generate DWARF for them
5197 Note that the C++ front-end also plays some similar games for inline
5198 function definitions appearing within include files which also
5199 contain `#pragma interface' pragmas. */
5201 if (DECL_INITIAL (decl) == NULL_TREE)
5204 if (TREE_PUBLIC (decl)
5205 && ! DECL_EXTERNAL (decl)
5206 && ! DECL_ABSTRACT (decl))
5208 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5210 /* Output a .debug_pubnames entry for a public function
5211 defined in this compilation unit. */
5213 fputc ('\n', asm_out_file);
5214 ASM_OUTPUT_PUSH_SECTION (asm_out_file, PUBNAMES_SECTION);
5215 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number);
5216 ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
5217 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
5218 IDENTIFIER_POINTER (DECL_NAME (decl)));
5219 ASM_OUTPUT_POP_SECTION (asm_out_file);
5226 /* Ignore this VAR_DECL if it refers to a file-scope extern data
5227 object declaration and if the declaration was never even
5228 referenced from within this entire compilation unit. We
5229 suppress these DIEs in order to save space in the .debug section
5230 (by eliminating entries which are probably useless). Note that
5231 we must not suppress block-local extern declarations (whether
5232 used or not) because that would screw-up the debugger's name
5233 lookup mechanism and cause it to miss things which really ought
5234 to be in scope at a given point. */
5236 if (DECL_EXTERNAL (decl) && !TREE_USED (decl))
5239 if (TREE_PUBLIC (decl)
5240 && ! DECL_EXTERNAL (decl)
5241 && GET_CODE (DECL_RTL (decl)) == MEM
5242 && ! DECL_ABSTRACT (decl))
5244 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5246 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5248 /* Output a .debug_pubnames entry for a public variable
5249 defined in this compilation unit. */
5251 fputc ('\n', asm_out_file);
5252 ASM_OUTPUT_PUSH_SECTION (asm_out_file, PUBNAMES_SECTION);
5253 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number);
5254 ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
5255 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
5256 IDENTIFIER_POINTER (DECL_NAME (decl)));
5257 ASM_OUTPUT_POP_SECTION (asm_out_file);
5260 if (DECL_INITIAL (decl) == NULL)
5262 /* Output a .debug_aranges entry for a public variable
5263 which is tentatively defined in this compilation unit. */
5265 fputc ('\n', asm_out_file);
5266 ASM_OUTPUT_PUSH_SECTION (asm_out_file, ARANGES_SECTION);
5267 ASM_OUTPUT_DWARF_ADDR (asm_out_file,
5268 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
5269 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
5270 (unsigned) int_size_in_bytes (TREE_TYPE (decl)));
5271 ASM_OUTPUT_POP_SECTION (asm_out_file);
5275 /* If we are in terse mode, don't generate any DIEs to represent
5276 any variable declarations or definitions. */
5278 if (debug_info_level <= DINFO_LEVEL_TERSE)
5284 /* Don't bother trying to generate any DIEs to represent any of the
5285 normal built-in types for the language we are compiling, except
5286 in cases where the types in question are *not* DWARF fundamental
5287 types. We make an exception in the case of non-fundamental types
5288 for the sake of objective C (and perhaps C++) because the GNU
5289 front-ends for these languages may in fact create certain "built-in"
5290 types which are (for example) RECORD_TYPEs. In such cases, we
5291 really need to output these (non-fundamental) types because other
5292 DIEs may contain references to them. */
5294 /* Also ignore language dependent types here, because they are probably
5295 also built-in types. If we didn't ignore them, then we would get
5296 references to undefined labels because output_type doesn't support
5297 them. So, for now, we need to ignore them to avoid assembler
5300 /* ??? This code is different than the equivalent code in dwarf2out.c.
5301 The dwarf2out.c code is probably more correct. */
5303 if (DECL_SOURCE_LINE (decl) == 0
5304 && (type_is_fundamental (TREE_TYPE (decl))
5305 || TREE_CODE (TREE_TYPE (decl)) == LANG_TYPE))
5308 /* If we are in terse mode, don't generate any DIEs to represent
5309 any actual typedefs. Note that even when we are in terse mode,
5310 we must still output DIEs to represent those tagged types which
5311 are used (directly or indirectly) in the specification of either
5312 a return type or a formal parameter type of some function. */
5314 if (debug_info_level <= DINFO_LEVEL_TERSE)
5315 if (! TYPE_DECL_IS_STUB (decl)
5316 || ! TYPE_USED_FOR_FUNCTION (TREE_TYPE (decl)))
5325 fputc ('\n', asm_out_file);
5326 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
5327 finalizing = set_finalizing;
5328 output_decl (decl, NULL_TREE);
5330 /* NOTE: The call above to `output_decl' may have caused one or more
5331 file-scope named types (i.e. tagged types) to be placed onto the
5332 pending_types_list. We have to get those types off of that list
5333 at some point, and this is the perfect time to do it. If we didn't
5334 take them off now, they might still be on the list when cc1 finally
5335 exits. That might be OK if it weren't for the fact that when we put
5336 types onto the pending_types_list, we set the TREE_ASM_WRITTEN flag
5337 for these types, and that causes them never to be output unless
5338 `output_pending_types_for_scope' takes them off of the list and un-sets
5339 their TREE_ASM_WRITTEN flags. */
5341 output_pending_types_for_scope (NULL_TREE);
5343 /* The above call should have totally emptied the pending_types_list
5344 if this is not a nested function or class. If this is a nested type,
5345 then the remaining pending_types will be emitted when the containing type
5348 if (! DECL_CONTEXT (decl))
5350 if (pending_types != 0)
5354 ASM_OUTPUT_POP_SECTION (asm_out_file);
5356 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl) != NULL)
5357 current_funcdef_number++;
5360 /* Output a marker (i.e. a label) for the beginning of the generated code
5361 for a lexical block. */
5364 dwarfout_begin_block (blocknum)
5365 register unsigned blocknum;
5367 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5369 function_section (current_function_decl);
5370 sprintf (label, BLOCK_BEGIN_LABEL_FMT, blocknum);
5371 ASM_OUTPUT_LABEL (asm_out_file, label);
5374 /* Output a marker (i.e. a label) for the end of the generated code
5375 for a lexical block. */
5378 dwarfout_end_block (blocknum)
5379 register unsigned blocknum;
5381 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5383 function_section (current_function_decl);
5384 sprintf (label, BLOCK_END_LABEL_FMT, blocknum);
5385 ASM_OUTPUT_LABEL (asm_out_file, label);
5388 /* Output a marker (i.e. a label) at a point in the assembly code which
5389 corresponds to a given source level label. */
5392 dwarfout_label (insn)
5395 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5397 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5399 function_section (current_function_decl);
5400 sprintf (label, INSN_LABEL_FMT, current_funcdef_number,
5401 (unsigned) INSN_UID (insn));
5402 ASM_OUTPUT_LABEL (asm_out_file, label);
5406 /* Output a marker (i.e. a label) for the point in the generated code where
5407 the real body of the function begins (after parameters have been moved
5408 to their home locations). */
5411 dwarfout_begin_function ()
5413 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5415 if (! use_gnu_debug_info_extensions)
5417 function_section (current_function_decl);
5418 sprintf (label, BODY_BEGIN_LABEL_FMT, current_funcdef_number);
5419 ASM_OUTPUT_LABEL (asm_out_file, label);
5422 /* Output a marker (i.e. a label) for the point in the generated code where
5423 the real body of the function ends (just before the epilogue code). */
5426 dwarfout_end_function ()
5428 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5430 if (! use_gnu_debug_info_extensions)
5432 function_section (current_function_decl);
5433 sprintf (label, BODY_END_LABEL_FMT, current_funcdef_number);
5434 ASM_OUTPUT_LABEL (asm_out_file, label);
5437 /* Output a marker (i.e. a label) for the absolute end of the generated code
5438 for a function definition. This gets called *after* the epilogue code
5439 has been generated. */
5442 dwarfout_end_epilogue ()
5444 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5446 /* Output a label to mark the endpoint of the code generated for this
5449 sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number);
5450 ASM_OUTPUT_LABEL (asm_out_file, label);
5454 shuffle_filename_entry (new_zeroth)
5455 register filename_entry *new_zeroth;
5457 filename_entry temp_entry;
5458 register filename_entry *limit_p;
5459 register filename_entry *move_p;
5461 if (new_zeroth == &filename_table[0])
5464 temp_entry = *new_zeroth;
5466 /* Shift entries up in the table to make room at [0]. */
5468 limit_p = &filename_table[0];
5469 for (move_p = new_zeroth; move_p > limit_p; move_p--)
5470 *move_p = *(move_p-1);
5472 /* Install the found entry at [0]. */
5474 filename_table[0] = temp_entry;
5477 /* Create a new (string) entry for the .debug_sfnames section. */
5480 generate_new_sfname_entry ()
5482 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5484 fputc ('\n', asm_out_file);
5485 ASM_OUTPUT_PUSH_SECTION (asm_out_file, SFNAMES_SECTION);
5486 sprintf (label, SFNAMES_ENTRY_LABEL_FMT, filename_table[0].number);
5487 ASM_OUTPUT_LABEL (asm_out_file, label);
5488 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
5489 filename_table[0].name
5490 ? filename_table[0].name
5492 ASM_OUTPUT_POP_SECTION (asm_out_file);
5495 /* Lookup a filename (in the list of filenames that we know about here in
5496 dwarfout.c) and return its "index". The index of each (known) filename
5497 is just a unique number which is associated with only that one filename.
5498 We need such numbers for the sake of generating labels (in the
5499 .debug_sfnames section) and references to those unique labels (in the
5500 .debug_srcinfo and .debug_macinfo sections).
5502 If the filename given as an argument is not found in our current list,
5503 add it to the list and assign it the next available unique index number.
5505 Whatever we do (i.e. whether we find a pre-existing filename or add a new
5506 one), we shuffle the filename found (or added) up to the zeroth entry of
5507 our list of filenames (which is always searched linearly). We do this so
5508 as to optimize the most common case for these filename lookups within
5509 dwarfout.c. The most common case by far is the case where we call
5510 lookup_filename to lookup the very same filename that we did a lookup
5511 on the last time we called lookup_filename. We make sure that this
5512 common case is fast because such cases will constitute 99.9% of the
5513 lookups we ever do (in practice).
5515 If we add a new filename entry to our table, we go ahead and generate
5516 the corresponding entry in the .debug_sfnames section right away.
5517 Doing so allows us to avoid tickling an assembler bug (present in some
5518 m68k assemblers) which yields assembly-time errors in cases where the
5519 difference of two label addresses is taken and where the two labels
5520 are in a section *other* than the one where the difference is being
5521 calculated, and where at least one of the two symbol references is a
5522 forward reference. (This bug could be tickled by our .debug_srcinfo
5523 entries if we don't output their corresponding .debug_sfnames entries
5527 lookup_filename (file_name)
5528 const char *file_name;
5530 register filename_entry *search_p;
5531 register filename_entry *limit_p = &filename_table[ft_entries];
5533 for (search_p = filename_table; search_p < limit_p; search_p++)
5534 if (!strcmp (file_name, search_p->name))
5536 /* When we get here, we have found the filename that we were
5537 looking for in the filename_table. Now we want to make sure
5538 that it gets moved to the zero'th entry in the table (if it
5539 is not already there) so that subsequent attempts to find the
5540 same filename will find it as quickly as possible. */
5542 shuffle_filename_entry (search_p);
5543 return filename_table[0].number;
5546 /* We come here whenever we have a new filename which is not registered
5547 in the current table. Here we add it to the table. */
5549 /* Prepare to add a new table entry by making sure there is enough space
5550 in the table to do so. If not, expand the current table. */
5552 if (ft_entries == ft_entries_allocated)
5554 ft_entries_allocated += FT_ENTRIES_INCREMENT;
5556 = (filename_entry *)
5557 xrealloc (filename_table,
5558 ft_entries_allocated * sizeof (filename_entry));
5561 /* Initially, add the new entry at the end of the filename table. */
5563 filename_table[ft_entries].number = ft_entries;
5564 filename_table[ft_entries].name = xstrdup (file_name);
5566 /* Shuffle the new entry into filename_table[0]. */
5568 shuffle_filename_entry (&filename_table[ft_entries]);
5570 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5571 generate_new_sfname_entry ();
5574 return filename_table[0].number;
5578 generate_srcinfo_entry (line_entry_num, files_entry_num)
5579 unsigned line_entry_num;
5580 unsigned files_entry_num;
5582 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5584 fputc ('\n', asm_out_file);
5585 ASM_OUTPUT_PUSH_SECTION (asm_out_file, SRCINFO_SECTION);
5586 sprintf (label, LINE_ENTRY_LABEL_FMT, line_entry_num);
5587 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, LINE_BEGIN_LABEL);
5588 sprintf (label, SFNAMES_ENTRY_LABEL_FMT, files_entry_num);
5589 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, SFNAMES_BEGIN_LABEL);
5590 ASM_OUTPUT_POP_SECTION (asm_out_file);
5594 dwarfout_line (filename, line)
5595 register const char *filename;
5596 register unsigned line;
5598 if (debug_info_level >= DINFO_LEVEL_NORMAL
5599 /* We can't emit line number info for functions in separate sections,
5600 because the assembler can't subtract labels in different sections. */
5601 && DECL_SECTION_NAME (current_function_decl) == NULL_TREE)
5603 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5604 static unsigned last_line_entry_num = 0;
5605 static unsigned prev_file_entry_num = (unsigned) -1;
5606 register unsigned this_file_entry_num;
5608 function_section (current_function_decl);
5609 sprintf (label, LINE_CODE_LABEL_FMT, ++last_line_entry_num);
5610 ASM_OUTPUT_LABEL (asm_out_file, label);
5612 fputc ('\n', asm_out_file);
5614 if (use_gnu_debug_info_extensions)
5615 this_file_entry_num = lookup_filename (filename);
5617 this_file_entry_num = (unsigned) -1;
5619 ASM_OUTPUT_PUSH_SECTION (asm_out_file, LINE_SECTION);
5620 if (this_file_entry_num != prev_file_entry_num)
5622 char line_entry_label[MAX_ARTIFICIAL_LABEL_BYTES];
5624 sprintf (line_entry_label, LINE_ENTRY_LABEL_FMT, last_line_entry_num);
5625 ASM_OUTPUT_LABEL (asm_out_file, line_entry_label);
5629 register const char *tail = rindex (filename, '/');
5635 fprintf (asm_out_file, "\t%s\t%u\t%s %s:%u\n",
5636 UNALIGNED_INT_ASM_OP, line, ASM_COMMENT_START,
5638 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0xffff);
5639 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, TEXT_BEGIN_LABEL);
5640 ASM_OUTPUT_POP_SECTION (asm_out_file);
5642 if (this_file_entry_num != prev_file_entry_num)
5643 generate_srcinfo_entry (last_line_entry_num, this_file_entry_num);
5644 prev_file_entry_num = this_file_entry_num;
5648 /* Generate an entry in the .debug_macinfo section. */
5651 generate_macinfo_entry (type_and_offset, string)
5652 register const char *type_and_offset;
5653 register const char *string;
5655 if (! use_gnu_debug_info_extensions)
5658 fputc ('\n', asm_out_file);
5659 ASM_OUTPUT_PUSH_SECTION (asm_out_file, MACINFO_SECTION);
5660 fprintf (asm_out_file, "\t%s\t%s\n", UNALIGNED_INT_ASM_OP, type_and_offset);
5661 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, string);
5662 ASM_OUTPUT_POP_SECTION (asm_out_file);
5666 dwarfout_start_new_source_file (filename)
5667 register const char *filename;
5669 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5670 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*3];
5672 sprintf (label, SFNAMES_ENTRY_LABEL_FMT, lookup_filename (filename));
5673 sprintf (type_and_offset, "0x%08x+%s-%s",
5674 ((unsigned) MACINFO_start << 24),
5675 /* Hack: skip leading '*' . */
5676 (*label == '*') + label,
5677 (*SFNAMES_BEGIN_LABEL == '*') + SFNAMES_BEGIN_LABEL);
5678 generate_macinfo_entry (type_and_offset, "");
5682 dwarfout_resume_previous_source_file (lineno)
5683 register unsigned lineno;
5685 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2];
5687 sprintf (type_and_offset, "0x%08x+%u",
5688 ((unsigned) MACINFO_resume << 24), lineno);
5689 generate_macinfo_entry (type_and_offset, "");
5692 /* Called from check_newline in c-parse.y. The `buffer' parameter
5693 contains the tail part of the directive line, i.e. the part which
5694 is past the initial whitespace, #, whitespace, directive-name,
5698 dwarfout_define (lineno, buffer)
5699 register unsigned lineno;
5700 register const char *buffer;
5702 static int initialized = 0;
5703 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2];
5707 dwarfout_start_new_source_file (primary_filename);
5710 sprintf (type_and_offset, "0x%08x+%u",
5711 ((unsigned) MACINFO_define << 24), lineno);
5712 generate_macinfo_entry (type_and_offset, buffer);
5715 /* Called from check_newline in c-parse.y. The `buffer' parameter
5716 contains the tail part of the directive line, i.e. the part which
5717 is past the initial whitespace, #, whitespace, directive-name,
5721 dwarfout_undef (lineno, buffer)
5722 register unsigned lineno;
5723 register const char *buffer;
5725 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2];
5727 sprintf (type_and_offset, "0x%08x+%u",
5728 ((unsigned) MACINFO_undef << 24), lineno);
5729 generate_macinfo_entry (type_and_offset, buffer);
5732 /* Set up for Dwarf output at the start of compilation. */
5735 dwarfout_init (asm_out_file, main_input_filename)
5736 register FILE *asm_out_file;
5737 register char *main_input_filename;
5739 /* Remember the name of the primary input file. */
5741 primary_filename = main_input_filename;
5743 /* Allocate the initial hunk of the pending_sibling_stack. */
5745 pending_sibling_stack
5747 xmalloc (PENDING_SIBLINGS_INCREMENT * sizeof (unsigned));
5748 pending_siblings_allocated = PENDING_SIBLINGS_INCREMENT;
5749 pending_siblings = 1;
5751 /* Allocate the initial hunk of the filename_table. */
5754 = (filename_entry *)
5755 xmalloc (FT_ENTRIES_INCREMENT * sizeof (filename_entry));
5756 ft_entries_allocated = FT_ENTRIES_INCREMENT;
5759 /* Allocate the initial hunk of the pending_types_list. */
5762 = (tree *) xmalloc (PENDING_TYPES_INCREMENT * sizeof (tree));
5763 pending_types_allocated = PENDING_TYPES_INCREMENT;
5766 /* Create an artificial RECORD_TYPE node which we can use in our hack
5767 to get the DIEs representing types of formal parameters to come out
5768 only *after* the DIEs for the formal parameters themselves. */
5770 fake_containing_scope = make_node (RECORD_TYPE);
5772 /* Output a starting label for the .text section. */
5774 fputc ('\n', asm_out_file);
5775 ASM_OUTPUT_PUSH_SECTION (asm_out_file, TEXT_SECTION);
5776 ASM_OUTPUT_LABEL (asm_out_file, TEXT_BEGIN_LABEL);
5777 ASM_OUTPUT_POP_SECTION (asm_out_file);
5779 /* Output a starting label for the .data section. */
5781 fputc ('\n', asm_out_file);
5782 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA_SECTION);
5783 ASM_OUTPUT_LABEL (asm_out_file, DATA_BEGIN_LABEL);
5784 ASM_OUTPUT_POP_SECTION (asm_out_file);
5786 #if 0 /* GNU C doesn't currently use .data1. */
5787 /* Output a starting label for the .data1 section. */
5789 fputc ('\n', asm_out_file);
5790 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA1_SECTION);
5791 ASM_OUTPUT_LABEL (asm_out_file, DATA1_BEGIN_LABEL);
5792 ASM_OUTPUT_POP_SECTION (asm_out_file);
5795 /* Output a starting label for the .rodata section. */
5797 fputc ('\n', asm_out_file);
5798 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA_SECTION);
5799 ASM_OUTPUT_LABEL (asm_out_file, RODATA_BEGIN_LABEL);
5800 ASM_OUTPUT_POP_SECTION (asm_out_file);
5802 #if 0 /* GNU C doesn't currently use .rodata1. */
5803 /* Output a starting label for the .rodata1 section. */
5805 fputc ('\n', asm_out_file);
5806 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA1_SECTION);
5807 ASM_OUTPUT_LABEL (asm_out_file, RODATA1_BEGIN_LABEL);
5808 ASM_OUTPUT_POP_SECTION (asm_out_file);
5811 /* Output a starting label for the .bss section. */
5813 fputc ('\n', asm_out_file);
5814 ASM_OUTPUT_PUSH_SECTION (asm_out_file, BSS_SECTION);
5815 ASM_OUTPUT_LABEL (asm_out_file, BSS_BEGIN_LABEL);
5816 ASM_OUTPUT_POP_SECTION (asm_out_file);
5818 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5820 if (use_gnu_debug_info_extensions)
5822 /* Output a starting label and an initial (compilation directory)
5823 entry for the .debug_sfnames section. The starting label will be
5824 referenced by the initial entry in the .debug_srcinfo section. */
5826 fputc ('\n', asm_out_file);
5827 ASM_OUTPUT_PUSH_SECTION (asm_out_file, SFNAMES_SECTION);
5828 ASM_OUTPUT_LABEL (asm_out_file, SFNAMES_BEGIN_LABEL);
5830 register char *pwd = getpwd ();
5831 register char *dirname;
5834 pfatal_with_name ("getpwd");
5835 dirname = concat (pwd, "/", NULL);
5836 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, dirname);
5839 ASM_OUTPUT_POP_SECTION (asm_out_file);
5842 if (debug_info_level >= DINFO_LEVEL_VERBOSE
5843 && use_gnu_debug_info_extensions)
5845 /* Output a starting label for the .debug_macinfo section. This
5846 label will be referenced by the AT_mac_info attribute in the
5847 TAG_compile_unit DIE. */
5849 fputc ('\n', asm_out_file);
5850 ASM_OUTPUT_PUSH_SECTION (asm_out_file, MACINFO_SECTION);
5851 ASM_OUTPUT_LABEL (asm_out_file, MACINFO_BEGIN_LABEL);
5852 ASM_OUTPUT_POP_SECTION (asm_out_file);
5855 /* Generate the initial entry for the .line section. */
5857 fputc ('\n', asm_out_file);
5858 ASM_OUTPUT_PUSH_SECTION (asm_out_file, LINE_SECTION);
5859 ASM_OUTPUT_LABEL (asm_out_file, LINE_BEGIN_LABEL);
5860 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, LINE_END_LABEL, LINE_BEGIN_LABEL);
5861 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL);
5862 ASM_OUTPUT_POP_SECTION (asm_out_file);
5864 if (use_gnu_debug_info_extensions)
5866 /* Generate the initial entry for the .debug_srcinfo section. */
5868 fputc ('\n', asm_out_file);
5869 ASM_OUTPUT_PUSH_SECTION (asm_out_file, SRCINFO_SECTION);
5870 ASM_OUTPUT_LABEL (asm_out_file, SRCINFO_BEGIN_LABEL);
5871 ASM_OUTPUT_DWARF_ADDR (asm_out_file, LINE_BEGIN_LABEL);
5872 ASM_OUTPUT_DWARF_ADDR (asm_out_file, SFNAMES_BEGIN_LABEL);
5873 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL);
5874 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_END_LABEL);
5875 #ifdef DWARF_TIMESTAMPS
5876 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, time (NULL));
5878 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, -1);
5880 ASM_OUTPUT_POP_SECTION (asm_out_file);
5883 /* Generate the initial entry for the .debug_pubnames section. */
5885 fputc ('\n', asm_out_file);
5886 ASM_OUTPUT_PUSH_SECTION (asm_out_file, PUBNAMES_SECTION);
5887 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DEBUG_BEGIN_LABEL);
5888 ASM_OUTPUT_POP_SECTION (asm_out_file);
5890 /* Generate the initial entry for the .debug_aranges section. */
5892 fputc ('\n', asm_out_file);
5893 ASM_OUTPUT_PUSH_SECTION (asm_out_file, ARANGES_SECTION);
5894 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DEBUG_BEGIN_LABEL);
5895 ASM_OUTPUT_POP_SECTION (asm_out_file);
5898 /* Setup first DIE number == 1. */
5899 NEXT_DIE_NUM = next_unused_dienum++;
5901 /* Generate the initial DIE for the .debug section. Note that the
5902 (string) value given in the AT_name attribute of the TAG_compile_unit
5903 DIE will (typically) be a relative pathname and that this pathname
5904 should be taken as being relative to the directory from which the
5905 compiler was invoked when the given (base) source file was compiled. */
5907 fputc ('\n', asm_out_file);
5908 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
5909 ASM_OUTPUT_LABEL (asm_out_file, DEBUG_BEGIN_LABEL);
5910 output_die (output_compile_unit_die, main_input_filename);
5911 ASM_OUTPUT_POP_SECTION (asm_out_file);
5913 fputc ('\n', asm_out_file);
5916 /* Output stuff that dwarf requires at the end of every file. */
5921 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5923 retry_incomplete_types ();
5925 fputc ('\n', asm_out_file);
5926 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
5928 /* Mark the end of the chain of siblings which represent all file-scope
5929 declarations in this compilation unit. */
5931 /* The (null) DIE which represents the terminator for the (sibling linked)
5932 list of file-scope items is *special*. Normally, we would just call
5933 end_sibling_chain at this point in order to output a word with the
5934 value `4' and that word would act as the terminator for the list of
5935 DIEs describing file-scope items. Unfortunately, if we were to simply
5936 do that, the label that would follow this DIE in the .debug section
5937 (i.e. `..D2') would *not* be properly aligned (as it must be on some
5938 machines) to a 4 byte boundary.
5940 In order to force the label `..D2' to get aligned to a 4 byte boundary,
5941 the trick used is to insert extra (otherwise useless) padding bytes
5942 into the (null) DIE that we know must precede the ..D2 label in the
5943 .debug section. The amount of padding required can be anywhere between
5944 0 and 3 bytes. The length word at the start of this DIE (i.e. the one
5945 with the padding) would normally contain the value 4, but now it will
5946 also have to include the padding bytes, so it will instead have some
5947 value in the range 4..7.
5949 Fortunately, the rules of Dwarf say that any DIE whose length word
5950 contains *any* value less than 8 should be treated as a null DIE, so
5951 this trick works out nicely. Clever, eh? Don't give me any credit
5952 (or blame). I didn't think of this scheme. I just conformed to it.
5955 output_die (output_padded_null_die, (void *) 0);
5958 sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM);
5959 ASM_OUTPUT_LABEL (asm_out_file, label); /* should be ..D2 */
5960 ASM_OUTPUT_POP_SECTION (asm_out_file);
5962 /* Output a terminator label for the .text section. */
5964 fputc ('\n', asm_out_file);
5965 ASM_OUTPUT_PUSH_SECTION (asm_out_file, TEXT_SECTION);
5966 ASM_OUTPUT_LABEL (asm_out_file, TEXT_END_LABEL);
5967 ASM_OUTPUT_POP_SECTION (asm_out_file);
5969 /* Output a terminator label for the .data section. */
5971 fputc ('\n', asm_out_file);
5972 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA_SECTION);
5973 ASM_OUTPUT_LABEL (asm_out_file, DATA_END_LABEL);
5974 ASM_OUTPUT_POP_SECTION (asm_out_file);
5976 #if 0 /* GNU C doesn't currently use .data1. */
5977 /* Output a terminator label for the .data1 section. */
5979 fputc ('\n', asm_out_file);
5980 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA1_SECTION);
5981 ASM_OUTPUT_LABEL (asm_out_file, DATA1_END_LABEL);
5982 ASM_OUTPUT_POP_SECTION (asm_out_file);
5985 /* Output a terminator label for the .rodata section. */
5987 fputc ('\n', asm_out_file);
5988 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA_SECTION);
5989 ASM_OUTPUT_LABEL (asm_out_file, RODATA_END_LABEL);
5990 ASM_OUTPUT_POP_SECTION (asm_out_file);
5992 #if 0 /* GNU C doesn't currently use .rodata1. */
5993 /* Output a terminator label for the .rodata1 section. */
5995 fputc ('\n', asm_out_file);
5996 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA1_SECTION);
5997 ASM_OUTPUT_LABEL (asm_out_file, RODATA1_END_LABEL);
5998 ASM_OUTPUT_POP_SECTION (asm_out_file);
6001 /* Output a terminator label for the .bss section. */
6003 fputc ('\n', asm_out_file);
6004 ASM_OUTPUT_PUSH_SECTION (asm_out_file, BSS_SECTION);
6005 ASM_OUTPUT_LABEL (asm_out_file, BSS_END_LABEL);
6006 ASM_OUTPUT_POP_SECTION (asm_out_file);
6008 if (debug_info_level >= DINFO_LEVEL_NORMAL)
6010 /* Output a terminating entry for the .line section. */
6012 fputc ('\n', asm_out_file);
6013 ASM_OUTPUT_PUSH_SECTION (asm_out_file, LINE_SECTION);
6014 ASM_OUTPUT_LABEL (asm_out_file, LINE_LAST_ENTRY_LABEL);
6015 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6016 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0xffff);
6017 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, TEXT_END_LABEL, TEXT_BEGIN_LABEL);
6018 ASM_OUTPUT_LABEL (asm_out_file, LINE_END_LABEL);
6019 ASM_OUTPUT_POP_SECTION (asm_out_file);
6021 if (use_gnu_debug_info_extensions)
6023 /* Output a terminating entry for the .debug_srcinfo section. */
6025 fputc ('\n', asm_out_file);
6026 ASM_OUTPUT_PUSH_SECTION (asm_out_file, SRCINFO_SECTION);
6027 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file,
6028 LINE_LAST_ENTRY_LABEL, LINE_BEGIN_LABEL);
6029 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, -1);
6030 ASM_OUTPUT_POP_SECTION (asm_out_file);
6033 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
6035 /* Output terminating entries for the .debug_macinfo section. */
6037 dwarfout_resume_previous_source_file (0);
6039 fputc ('\n', asm_out_file);
6040 ASM_OUTPUT_PUSH_SECTION (asm_out_file, MACINFO_SECTION);
6041 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6042 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
6043 ASM_OUTPUT_POP_SECTION (asm_out_file);
6046 /* Generate the terminating entry for the .debug_pubnames section. */
6048 fputc ('\n', asm_out_file);
6049 ASM_OUTPUT_PUSH_SECTION (asm_out_file, PUBNAMES_SECTION);
6050 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6051 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
6052 ASM_OUTPUT_POP_SECTION (asm_out_file);
6054 /* Generate the terminating entries for the .debug_aranges section.
6056 Note that we want to do this only *after* we have output the end
6057 labels (for the various program sections) which we are going to
6058 refer to here. This allows us to work around a bug in the m68k
6059 svr4 assembler. That assembler gives bogus assembly-time errors
6060 if (within any given section) you try to take the difference of
6061 two relocatable symbols, both of which are located within some
6062 other section, and if one (or both?) of the symbols involved is
6063 being forward-referenced. By generating the .debug_aranges
6064 entries at this late point in the assembly output, we skirt the
6065 issue simply by avoiding forward-references.
6068 fputc ('\n', asm_out_file);
6069 ASM_OUTPUT_PUSH_SECTION (asm_out_file, ARANGES_SECTION);
6071 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL);
6072 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, TEXT_END_LABEL, TEXT_BEGIN_LABEL);
6074 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DATA_BEGIN_LABEL);
6075 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, DATA_END_LABEL, DATA_BEGIN_LABEL);
6077 #if 0 /* GNU C doesn't currently use .data1. */
6078 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DATA1_BEGIN_LABEL);
6079 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, DATA1_END_LABEL,
6083 ASM_OUTPUT_DWARF_ADDR (asm_out_file, RODATA_BEGIN_LABEL);
6084 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, RODATA_END_LABEL,
6085 RODATA_BEGIN_LABEL);
6087 #if 0 /* GNU C doesn't currently use .rodata1. */
6088 ASM_OUTPUT_DWARF_ADDR (asm_out_file, RODATA1_BEGIN_LABEL);
6089 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, RODATA1_END_LABEL,
6090 RODATA1_BEGIN_LABEL);
6093 ASM_OUTPUT_DWARF_ADDR (asm_out_file, BSS_BEGIN_LABEL);
6094 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, BSS_END_LABEL, BSS_BEGIN_LABEL);
6096 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6097 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6099 ASM_OUTPUT_POP_SECTION (asm_out_file);
6102 /* There should not be any pending types left at the end. We need
6103 this now because it may not have been checked on the last call to
6104 dwarfout_file_scope_decl. */
6105 if (pending_types != 0)
6109 #endif /* DWARF_DEBUGGING_INFO */
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