1 /* Output sdb-format symbol table information from GNU compiler.
2 Copyright (C) 1988, 1992 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* mike@tredysvr.Tredydev.Unisys.COM says:
21 I modified the struct.c example and have a nm of a .o resulting from the
22 AT&T C compiler. From the example below I would conclude the following:
24 1. All .defs from structures are emitted as scanned. The example below
25 clearly shows the symbol table entries for BoxRec2 are after the first
28 2. All functions and their locals (including statics) are emitted as scanned.
30 3. All nested unnamed union and structure .defs must be emitted before
31 the structure in which they are nested. The AT&T assembler is a
32 one pass beast as far as symbolics are concerned.
34 4. All structure .defs are emitted before the typedefs that refer to them.
36 5. All top level static and external variable definitions are moved to the
37 end of file with all top level statics occurring first before externs.
39 6. All undefined references are at the end of the file.
44 #ifdef SDB_DEBUGGING_INFO
51 #include "insn-config.h"
54 /* Mips systems use the SDB functions to dump out symbols, but
55 do not supply usable syms.h include files. */
56 #if defined(USG) && !defined(MIPS)
58 /* Use T_INT if we don't have T_VOID. */
62 #else /* not USG, or MIPS */
64 #endif /* not USG, or MIPS */
66 /* #include <storclass.h> used to be this instead of syms.h. */
68 /* 1 if PARM is passed to this function in memory. */
70 #define PARM_PASSED_IN_MEMORY(PARM) \
71 (GET_CODE (DECL_INCOMING_RTL (PARM)) == MEM)
73 /* A C expression for the integer offset value of an automatic variable
74 (C_AUTO) having address X (an RTX). */
75 #ifndef DEBUGGER_AUTO_OFFSET
76 #define DEBUGGER_AUTO_OFFSET(X) \
77 (GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0)
80 /* A C expression for the integer offset value of an argument (C_ARG)
81 having address X (an RTX). The nominal offset is OFFSET. */
82 #ifndef DEBUGGER_ARG_OFFSET
83 #define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET)
86 /* Line number of beginning of current function, minus one.
87 Negative means not in a function or not using sdb. */
89 int sdb_begin_function_line = -1;
91 /* Counter to generate unique "names" for nameless struct members. */
93 static int unnamed_struct_number = 0;
95 extern FILE *asm_out_file;
97 extern tree current_function_decl;
100 void sdbout_symbol ();
103 static void sdbout_typedefs ();
104 static void sdbout_syms ();
105 static void sdbout_one_type ();
106 static void sdbout_queue_anonymous_type ();
107 static void sdbout_dequeue_anonymous_types ();
108 static int plain_type_1 ();
110 /* Define the default sizes for various types. */
112 #ifndef CHAR_TYPE_SIZE
113 #define CHAR_TYPE_SIZE BITS_PER_UNIT
116 #ifndef SHORT_TYPE_SIZE
117 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
120 #ifndef INT_TYPE_SIZE
121 #define INT_TYPE_SIZE BITS_PER_WORD
124 #ifndef LONG_TYPE_SIZE
125 #define LONG_TYPE_SIZE BITS_PER_WORD
128 #ifndef LONG_LONG_TYPE_SIZE
129 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
132 #ifndef FLOAT_TYPE_SIZE
133 #define FLOAT_TYPE_SIZE BITS_PER_WORD
136 #ifndef DOUBLE_TYPE_SIZE
137 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
140 #ifndef LONG_DOUBLE_TYPE_SIZE
141 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
144 /* Random macros describing parts of SDB data. */
146 /* Put something here if lines get too long */
149 /* Default value of delimiter is ";". */
151 #define SDB_DELIM ";"
154 /* Maximum number of dimensions the assembler will allow. */
156 #define SDB_MAX_DIM 4
160 #define PUT_SDB_SCL(a) fprintf(asm_out_file, "\t.scl\t%d%s", (a), SDB_DELIM)
163 #ifndef PUT_SDB_INT_VAL
164 #define PUT_SDB_INT_VAL(a) fprintf (asm_out_file, "\t.val\t%d%s", (a), SDB_DELIM)
168 #define PUT_SDB_VAL(a) \
169 ( fputs ("\t.val\t", asm_out_file), \
170 output_addr_const (asm_out_file, (a)), \
171 fprintf (asm_out_file, SDB_DELIM))
175 #define PUT_SDB_DEF(a) \
176 do { fprintf (asm_out_file, "\t.def\t"); \
177 ASM_OUTPUT_LABELREF (asm_out_file, a); \
178 fprintf (asm_out_file, SDB_DELIM); } while (0)
181 #ifndef PUT_SDB_PLAIN_DEF
182 #define PUT_SDB_PLAIN_DEF(a) fprintf(asm_out_file,"\t.def\t.%s%s",a, SDB_DELIM)
185 #ifndef PUT_SDB_ENDEF
186 #define PUT_SDB_ENDEF fputs("\t.endef\n", asm_out_file)
190 #define PUT_SDB_TYPE(a) fprintf(asm_out_file, "\t.type\t0%o%s", a, SDB_DELIM)
194 #define PUT_SDB_SIZE(a) fprintf(asm_out_file, "\t.size\t%d%s", a, SDB_DELIM)
197 #ifndef PUT_SDB_START_DIM
198 #define PUT_SDB_START_DIM fprintf(asm_out_file, "\t.dim\t")
201 #ifndef PUT_SDB_NEXT_DIM
202 #define PUT_SDB_NEXT_DIM(a) fprintf(asm_out_file, "%d,", a)
205 #ifndef PUT_SDB_LAST_DIM
206 #define PUT_SDB_LAST_DIM(a) fprintf(asm_out_file, "%d%s", a, SDB_DELIM)
210 #define PUT_SDB_TAG(a) \
211 do { fprintf (asm_out_file, "\t.tag\t"); \
212 ASM_OUTPUT_LABELREF (asm_out_file, a); \
213 fprintf (asm_out_file, SDB_DELIM); } while (0)
216 #ifndef PUT_SDB_BLOCK_START
217 #define PUT_SDB_BLOCK_START(LINE) \
218 fprintf (asm_out_file, \
219 "\t.def\t.bb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \
220 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
223 #ifndef PUT_SDB_BLOCK_END
224 #define PUT_SDB_BLOCK_END(LINE) \
225 fprintf (asm_out_file, \
226 "\t.def\t.eb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \
227 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
230 #ifndef PUT_SDB_FUNCTION_START
231 #define PUT_SDB_FUNCTION_START(LINE) \
232 fprintf (asm_out_file, \
233 "\t.def\t.bf%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \
234 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
237 #ifndef PUT_SDB_FUNCTION_END
238 #define PUT_SDB_FUNCTION_END(LINE) \
239 fprintf (asm_out_file, \
240 "\t.def\t.ef%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \
241 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
244 #ifndef PUT_SDB_EPILOGUE_END
245 #define PUT_SDB_EPILOGUE_END(NAME) \
246 do { fprintf (asm_out_file, "\t.def\t"); \
247 ASM_OUTPUT_LABELREF (asm_out_file, NAME); \
248 fprintf (asm_out_file, \
249 "%s\t.val\t.%s\t.scl\t-1%s\t.endef\n", \
250 SDB_DELIM, SDB_DELIM, SDB_DELIM); } while (0)
253 #ifndef SDB_GENERATE_FAKE
254 #define SDB_GENERATE_FAKE(BUFFER, NUMBER) \
255 sprintf ((BUFFER), ".%dfake", (NUMBER));
258 /* Return the sdb tag identifier string for TYPE
259 if TYPE has already been defined; otherwise return a null pointer. */
261 #define KNOWN_TYPE_TAG(type) (char *)(TYPE_SYMTAB_ADDRESS (type))
263 /* Set the sdb tag identifier string for TYPE to NAME. */
265 #define SET_KNOWN_TYPE_TAG(TYPE, NAME) \
266 (TYPE_SYMTAB_ADDRESS (TYPE) = (int)(NAME))
268 /* Return the name (a string) of the struct, union or enum tag
269 described by the TREE_LIST node LINK. This is 0 for an anonymous one. */
271 #define TAG_NAME(link) \
272 (((link) && TREE_PURPOSE ((link)) \
273 && IDENTIFIER_POINTER (TREE_PURPOSE ((link)))) \
274 ? IDENTIFIER_POINTER (TREE_PURPOSE ((link))) : (char *) 0)
276 /* Ensure we don't output a negative line number. */
277 #define MAKE_LINE_SAFE(line) \
278 if (line <= sdb_begin_function_line) line = sdb_begin_function_line + 1
280 /* Set up for SDB output at the start of compilation. */
283 sdbout_init (asm_file, input_file_name, syms)
285 char *input_file_name;
288 #if 0 /* Nothing need be output for the predefined types. */
289 /* Get all permanent types that have typedef names,
290 and output them all, except for those already output. */
292 sdbout_typedefs (syms);
298 /* return the tag identifier for type
302 tag_of_ru_type (type,link)
305 if (TYPE_SYMTAB_ADDRESS (type))
306 return (char *)TYPE_SYMTAB_ADDRESS (type);
307 if (link && TREE_PURPOSE (link)
308 && IDENTIFIER_POINTER (TREE_PURPOSE (link)))
309 TYPE_SYMTAB_ADDRESS (type)
310 = (int)IDENTIFIER_POINTER (TREE_PURPOSE (link));
312 return (char *) TYPE_SYMTAB_ADDRESS (type);
316 /* Return a unique string to name an anonymous type. */
323 SDB_GENERATE_FAKE (label, unnamed_struct_number);
324 unnamed_struct_number++;
325 labelstr = (char *) permalloc (strlen (label) + 1);
326 strcpy (labelstr, label);
330 /* Return the number which describes TYPE for SDB.
331 For pointers, etc., this function is recursive.
332 Each record, union or enumeral type must already have had a
333 tag number output. */
335 /* The number is given by d6d5d4d3d2d1bbbb
336 where bbbb is 4 bit basic type, and di indicate one of notype,ptr,fn,array.
337 Thus, char *foo () has bbbb=T_CHAR
340 N_BTMASK= 017 1111 basic type field.
341 N_TSHIFT= 2 derived type shift
342 N_BTSHFT= 4 Basic type shift */
344 /* Produce the number that describes a pointer, function or array type.
345 PREV is the number describing the target, value or element type.
346 DT_type describes how to transform that type. */
347 #define PUSH_DERIVED_LEVEL(DT_type,PREV) \
348 ((((PREV)&~N_BTMASK)<<N_TSHIFT)|(DT_type<<N_BTSHFT)|(PREV&N_BTMASK))
350 /* Number of elements used in sdb_dims. */
351 static int sdb_n_dims = 0;
353 /* Table of array dimensions of current type. */
354 static int sdb_dims[SDB_MAX_DIM];
356 /* Size of outermost array currently being processed. */
357 static int sdb_type_size = -1;
363 int val = plain_type_1 (type);
365 /* If we have already saved up some array dimensions, print them now. */
370 for (i = sdb_n_dims - 1; i > 0; i--)
371 PUT_SDB_NEXT_DIM (sdb_dims[i]);
372 PUT_SDB_LAST_DIM (sdb_dims[0]);
375 sdb_type_size = int_size_in_bytes (type);
376 /* Don't kill sdb if type is not laid out or has variable size. */
377 if (sdb_type_size < 0)
380 /* If we have computed the size of an array containing this type,
382 if (sdb_type_size >= 0)
384 PUT_SDB_SIZE (sdb_type_size);
391 sdbout_record_type_name (type)
397 if (KNOWN_TYPE_TAG (type))
400 if (TYPE_NAME (type) != 0)
403 /* Find the IDENTIFIER_NODE for the type name. */
404 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
406 t = TYPE_NAME (type);
408 #if 1 /* As a temprary hack, use typedef names for C++ only. */
409 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
410 && TYPE_LANG_SPECIFIC (type))
412 t = DECL_NAME (TYPE_NAME (type));
416 /* Now get the name as a string, or invent one. */
418 name = IDENTIFIER_POINTER (t);
421 no_name = (name == 0 || *name == 0);
423 name = gen_fake_label ();
425 SET_KNOWN_TYPE_TAG (type, name);
426 #ifdef SDB_ALLOW_FORWARD_REFERENCES
428 sdbout_queue_anonymous_type (type);
437 type = void_type_node;
438 if (type == error_mark_node)
439 type = integer_type_node;
440 type = TYPE_MAIN_VARIANT (type);
442 switch (TREE_CODE (type))
448 int size = int_size_in_bytes (type) * BITS_PER_UNIT;
449 if (size == CHAR_TYPE_SIZE)
450 return (TREE_UNSIGNED (type) ? T_UCHAR : T_CHAR);
451 if (size == SHORT_TYPE_SIZE)
452 return (TREE_UNSIGNED (type) ? T_USHORT : T_SHORT);
453 if (size == INT_TYPE_SIZE)
454 return (TREE_UNSIGNED (type) ? T_UINT : T_INT);
460 int size = int_size_in_bytes (type) * BITS_PER_UNIT;
461 if (size == FLOAT_TYPE_SIZE)
463 if (size == DOUBLE_TYPE_SIZE)
471 m = plain_type_1 (TREE_TYPE (type));
472 if (sdb_n_dims < SDB_MAX_DIM)
473 sdb_dims[sdb_n_dims++]
474 = (TYPE_DOMAIN (type)
475 ? TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) + 1
477 return PUSH_DERIVED_LEVEL (DT_ARY, m);
485 #ifdef SDB_ALLOW_FORWARD_REFERENCES
486 sdbout_record_type_name (type);
488 #ifndef SDB_ALLOW_UNKNOWN_REFERENCES
489 if ((TREE_ASM_WRITTEN (type) && KNOWN_TYPE_TAG (type) != 0)
490 #ifdef SDB_ALLOW_FORWARD_REFERENCES
491 || TYPE_MODE (type) != VOIDmode
496 /* Output the referenced structure tag name
497 only if the .def has already been finished.
498 At least on 386, the Unix assembler
499 cannot handle forward references to tags. */
500 /* But the 88100, it requires them, sigh... */
501 /* And the MIPS requires unknown refs as well... */
502 tag = KNOWN_TYPE_TAG (type);
504 /* These 3 lines used to follow the close brace.
505 However, a size of 0 without a tag implies a tag of 0,
506 so if we don't know a tag, we can't mention the size. */
507 sdb_type_size = int_size_in_bytes (type);
508 if (sdb_type_size < 0)
511 return ((TREE_CODE (type) == RECORD_TYPE) ? T_STRUCT
512 : (TREE_CODE (type) == UNION_TYPE) ? T_UNION
518 int m = plain_type_1 (TREE_TYPE (type));
519 return PUSH_DERIVED_LEVEL (DT_PTR, m);
524 int m = plain_type_1 (TREE_TYPE (type));
525 return PUSH_DERIVED_LEVEL (DT_FCN, m);
532 /* Output the symbols defined in block number DO_BLOCK.
533 Set NEXT_BLOCK_NUMBER to 0 before calling.
535 This function works by walking the tree structure of blocks,
536 counting blocks until it finds the desired block. */
538 static int do_block = 0;
540 static int next_block_number;
548 /* Ignore blocks never expanded or otherwise marked as real. */
549 if (TREE_USED (block))
551 /* When we reach the specified block, output its symbols. */
552 if (next_block_number == do_block)
554 sdbout_syms (BLOCK_VARS (block));
557 /* If we are past the specified block, stop the scan. */
558 if (next_block_number > do_block)
563 /* Scan the blocks within this block. */
564 sdbout_block (BLOCK_SUBBLOCKS (block));
567 block = BLOCK_CHAIN (block);
571 /* Call sdbout_symbol on each decl in the chain SYMS. */
579 if (TREE_CODE (syms) != LABEL_DECL)
580 sdbout_symbol (syms, 1);
581 syms = TREE_CHAIN (syms);
585 /* Output SDB information for a symbol described by DECL.
586 LOCAL is nonzero if the symbol is not file-scope. */
589 sdbout_symbol (decl, local)
594 tree type = TREE_TYPE (decl);
595 tree context = NULL_TREE;
600 sdbout_one_type (type);
602 #if 0 /* This loses when functions are marked to be ignored,
603 which happens in the C++ front end. */
604 if (DECL_IGNORED_P (decl))
608 switch (TREE_CODE (decl))
611 /* Enum values are defined by defining the enum type. */
615 /* Don't mention a nested function under its parent. */
616 context = decl_function_context (decl);
617 if (context == current_function_decl)
619 if (DECL_EXTERNAL (decl))
621 if (GET_CODE (DECL_RTL (decl)) != MEM
622 || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
624 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
625 PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
626 PUT_SDB_SCL (TREE_PUBLIC (decl) ? C_EXT : C_STAT);
630 /* Done with tagged types. */
631 if (DECL_NAME (decl) == 0)
633 if (DECL_IGNORED_P (decl))
636 /* Output typedef name. */
637 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl)));
638 PUT_SDB_SCL (C_TPDEF);
642 /* Parm decls go in their own separate chains
643 and are output by sdbout_reg_parms and sdbout_parms. */
647 /* Don't mention a variable that is external.
648 Let the file that defines it describe it. */
649 if (DECL_EXTERNAL (decl))
652 /* Ignore __FUNCTION__, etc. */
653 if (DECL_IGNORED_P (decl))
656 /* If there was an error in the declaration, don't dump core
657 if there is no RTL associated with the variable doesn't
659 if (DECL_RTL (decl) == 0)
662 DECL_RTL (decl) = eliminate_regs (DECL_RTL (decl), 0, NULL_RTX);
663 #ifdef LEAF_REG_REMAP
665 leaf_renumber_regs_insn (DECL_RTL (decl));
667 value = DECL_RTL (decl);
669 /* Don't mention a variable at all
670 if it was completely optimized into nothingness.
672 If DECL was from an inline function, then its rtl
673 is not identically the rtl that was used in this
674 particular compilation. */
675 if (GET_CODE (value) == REG)
677 regno = REGNO (DECL_RTL (decl));
678 if (regno >= FIRST_PSEUDO_REGISTER)
681 else if (GET_CODE (value) == SUBREG)
684 while (GET_CODE (value) == SUBREG)
686 offset += SUBREG_WORD (value);
687 value = SUBREG_REG (value);
689 if (GET_CODE (value) == REG)
691 regno = REGNO (value);
692 if (regno >= FIRST_PSEUDO_REGISTER)
696 alter_subreg (DECL_RTL (decl));
697 value = DECL_RTL (decl);
700 /* Emit any structure, union, or enum type that has not been output.
701 This occurs for tag-less structs (et al) used to declare variables
703 if (TREE_CODE (type) == ENUMERAL_TYPE
704 || TREE_CODE (type) == RECORD_TYPE
705 || TREE_CODE (type) == UNION_TYPE)
707 if (TYPE_SIZE (type) != 0 /* not a forward reference */
708 && KNOWN_TYPE_TAG (type) == 0) /* not yet declared */
709 sdbout_one_type (type);
712 /* Defer SDB information for top-level initialized variables! */
714 && GET_CODE (value) == MEM
715 && DECL_INITIAL (decl))
718 /* Record the name for, starting a symtab entry. */
719 name = IDENTIFIER_POINTER (DECL_NAME (decl));
721 if (GET_CODE (value) == MEM
722 && GET_CODE (XEXP (value, 0)) == SYMBOL_REF)
725 if (TREE_PUBLIC (decl))
727 PUT_SDB_VAL (XEXP (value, 0));
732 PUT_SDB_VAL (XEXP (value, 0));
733 PUT_SDB_SCL (C_STAT);
739 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (regno));
742 else if (GET_CODE (value) == MEM
743 && (GET_CODE (XEXP (value, 0)) == MEM
744 || (GET_CODE (XEXP (value, 0)) == REG
745 && REGNO (XEXP (value, 0)) != FRAME_POINTER_REGNUM
746 && REGNO (XEXP (value, 0)) != STACK_POINTER_REGNUM)))
747 /* If the value is indirect by memory or by a register
748 that isn't the frame pointer
749 then it means the object is variable-sized and address through
750 that register or stack slot. COFF has no way to represent this
751 so all we can do is output the variable as a pointer. */
754 if (GET_CODE (XEXP (value, 0)) == REG)
756 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (XEXP (value, 0))));
761 /* DECL_RTL looks like (MEM (MEM (PLUS (REG...)
763 We want the value of that CONST_INT. */
764 /* Encore compiler hates a newline in a macro arg, it seems. */
765 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET
766 (XEXP (XEXP (value, 0), 0)));
767 PUT_SDB_SCL (C_AUTO);
770 type = build_pointer_type (TREE_TYPE (decl));
772 else if (GET_CODE (value) == MEM
773 && GET_CODE (XEXP (value, 0)) == PLUS
774 && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG
775 && GET_CODE (XEXP (XEXP (value, 0), 1)) == CONST_INT)
777 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))).
778 We want the value of that CONST_INT. */
780 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET (XEXP (value, 0)));
781 PUT_SDB_SCL (C_AUTO);
783 else if (GET_CODE (value) == MEM && GET_CODE (XEXP (value, 0)) == CONST)
785 /* Handle an obscure case which can arise when optimizing and
786 when there are few available registers. (This is *always*
787 the case for i386/i486 targets). The DECL_RTL looks like
788 (MEM (CONST ...)) even though this variable is a local `auto'
789 or a local `register' variable. In effect, what has happened
790 is that the reload pass has seen that all assignments and
791 references for one such a local variable can be replaced by
792 equivalent assignments and references to some static storage
793 variable, thereby avoiding the need for a register. In such
794 cases we're forced to lie to debuggers and tell them that
795 this variable was itself `static'. */
797 PUT_SDB_VAL (XEXP (XEXP (value, 0), 0));
798 PUT_SDB_SCL (C_STAT);
802 /* It is something we don't know how to represent for SDB. */
807 PUT_SDB_TYPE (plain_type (type));
811 /* Output SDB information for a top-level initialized variable
812 that has been delayed. */
815 sdbout_toplevel_data (decl)
818 tree type = TREE_TYPE (decl);
820 if (DECL_IGNORED_P (decl))
823 if (! (TREE_CODE (decl) == VAR_DECL
824 && GET_CODE (DECL_RTL (decl)) == MEM
825 && DECL_INITIAL (decl)))
828 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
829 PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
830 if (TREE_PUBLIC (decl))
836 PUT_SDB_SCL (C_STAT);
838 PUT_SDB_TYPE (plain_type (type));
842 #ifdef SDB_ALLOW_FORWARD_REFERENCES
844 /* Machinery to record and output anonymous types. */
846 static tree anonymous_types;
849 sdbout_queue_anonymous_type (type)
852 anonymous_types = saveable_tree_cons (NULL_TREE, type, anonymous_types);
856 sdbout_dequeue_anonymous_types ()
858 register tree types, link;
860 while (anonymous_types)
862 types = nreverse (anonymous_types);
863 anonymous_types = NULL_TREE;
865 for (link = types; link; link = TREE_CHAIN (link))
867 register tree type = TREE_VALUE (link);
869 if (type && ! TREE_ASM_WRITTEN (type))
870 sdbout_one_type (type);
877 /* Given a chain of ..._TYPE nodes, all of which have names,
878 output definitions of those names, as typedefs. */
886 for (link = types; link; link = TREE_CHAIN (link))
887 sdbout_one_type (link);
889 #ifdef SDB_ALLOW_FORWARD_REFERENCES
890 sdbout_dequeue_anonymous_types ();
899 if (type == error_mark_node)
900 type = integer_type_node;
901 PUT_SDB_TYPE (plain_type (type));
904 /* Output types of the fields of type TYPE, if they are structs.
906 Formerly did not chase through pointer types, since that could be circular.
907 They must come before TYPE, since forward refs are not allowed.
908 Now james@bigtex.cactus.org says to try them. */
911 sdbout_field_types (type)
915 for (tail = TYPE_FIELDS (type); tail; tail = TREE_CHAIN (tail))
916 if (TREE_CODE (TREE_TYPE (tail)) == POINTER_TYPE)
917 sdbout_one_type (TREE_TYPE (TREE_TYPE (tail)));
919 sdbout_one_type (TREE_TYPE (tail));
922 /* Use this to put out the top level defined record and union types
923 for later reference. If this is a struct with a name, then put that
924 name out. Other unnamed structs will have .xxfake labels generated so
925 that they may be referred to later.
926 The label will be stored in the KNOWN_TYPE_TAG slot of a type.
927 It may NOT be called recursively. */
930 sdbout_one_type (type)
935 switch (TREE_CODE (type))
940 type = TYPE_MAIN_VARIANT (type);
941 /* Don't output a type twice. */
942 if (TREE_ASM_WRITTEN (type))
943 /* James said test TREE_ASM_BEING_WRITTEN here. */
946 /* Output nothing if type is not yet defined. */
947 if (TYPE_SIZE (type) == 0)
950 TREE_ASM_WRITTEN (type) = 1;
952 /* This is reputed to cause trouble with the following case,
953 but perhaps checking TYPE_SIZE above will fix it. */
955 /* Here is a test case:
961 typedef struct intermediate {
965 typedef struct badstr {
970 TREE_ASM_BEING_WRITTEN (type) = 1;
972 /* This change, which ought to make better output,
973 used to make the COFF assembler unhappy.
974 Changes involving KNOWN_TYPE_TAG may fix the problem. */
975 /* Before really doing anything, output types we want to refer to. */
976 /* Note that in version 1 the following two lines
977 are not used if forward references are in use. */
978 if (TREE_CODE (type) != ENUMERAL_TYPE)
979 sdbout_field_types (type);
981 TREE_ASM_WRITTEN (type) = 1;
985 /* Output a structure type. */
987 int size = int_size_in_bytes (type);
990 int i, n_baseclasses = 0;
992 /* Record the type tag, but not in its permanent place just yet. */
993 sdbout_record_type_name (type);
995 PUT_SDB_DEF (KNOWN_TYPE_TAG (type));
997 switch (TREE_CODE (type))
1000 PUT_SDB_SCL (C_UNTAG);
1001 PUT_SDB_TYPE (T_UNION);
1006 PUT_SDB_SCL (C_STRTAG);
1007 PUT_SDB_TYPE (T_STRUCT);
1012 PUT_SDB_SCL (C_ENTAG);
1013 PUT_SDB_TYPE (T_ENUM);
1018 PUT_SDB_SIZE (size);
1021 /* Print out the base class information with fields
1022 named after the types they hold. */
1023 if (TYPE_BINFO (type)
1024 && TYPE_BINFO_BASETYPES (type))
1025 n_baseclasses = TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type));
1026 for (i = 0; i < n_baseclasses; i++)
1028 tree child = TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (type)), i);
1029 tree child_type = BINFO_TYPE (child);
1030 tree child_type_name;
1031 if (TYPE_NAME (child_type) == 0)
1033 if (TREE_CODE (TYPE_NAME (child_type)) == IDENTIFIER_NODE)
1034 child_type_name = TYPE_NAME (child_type);
1035 else if (TREE_CODE (TYPE_NAME (child_type)) == TYPE_DECL)
1036 child_type_name = DECL_NAME (TYPE_NAME (child_type));
1041 PUT_SDB_DEF (IDENTIFIER_POINTER (child_type_name));
1042 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (BINFO_OFFSET (child)));
1043 PUT_SDB_SCL (member_scl);
1044 sdbout_type (BINFO_TYPE (child));
1048 /* output the individual fields */
1050 if (TREE_CODE (type) == ENUMERAL_TYPE)
1051 for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
1053 PUT_SDB_DEF (IDENTIFIER_POINTER (TREE_PURPOSE (tem)));
1054 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (TREE_VALUE (tem)));
1055 PUT_SDB_SCL (C_MOE);
1056 PUT_SDB_TYPE (T_MOE);
1060 else /* record or union type */
1061 for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
1062 /* Output the name, type, position (in bits), size (in bits)
1065 /* Omit here the nameless fields that are used to skip bits.
1066 Also omit fields with variable size or position.
1067 Also omit non FIELD_DECL nodes that GNU C++ may put here. */
1068 if (TREE_CODE (tem) == FIELD_DECL
1069 && DECL_NAME (tem) != 0
1070 && TREE_CODE (DECL_SIZE (tem)) == INTEGER_CST
1071 && TREE_CODE (DECL_FIELD_BITPOS (tem)) == INTEGER_CST)
1074 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (tem)));
1075 if (DECL_BIT_FIELD_TYPE (tem))
1077 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)));
1078 PUT_SDB_SCL (C_FIELD);
1079 sdbout_type (DECL_BIT_FIELD_TYPE (tem));
1080 PUT_SDB_SIZE (TREE_INT_CST_LOW (DECL_SIZE (tem)));
1084 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem))
1086 PUT_SDB_SCL (member_scl);
1087 sdbout_type (TREE_TYPE (tem));
1091 /* output end of a structure,union, or enumeral definition */
1093 PUT_SDB_PLAIN_DEF ("eos");
1094 PUT_SDB_INT_VAL (size);
1095 PUT_SDB_SCL (C_EOS);
1096 PUT_SDB_TAG (KNOWN_TYPE_TAG (type));
1097 PUT_SDB_SIZE (size);
1104 /* The following two functions output definitions of function parameters.
1105 Each parameter gets a definition locating it in the parameter list.
1106 Each parameter that is a register variable gets a second definition
1107 locating it in the register.
1109 Printing or argument lists in gdb uses the definitions that
1110 locate in the parameter list. But reference to the variable in
1111 expressions uses preferentially the definition as a register. */
1113 /* Output definitions, referring to storage in the parmlist,
1114 of all the parms in PARMS, which is a chain of PARM_DECL nodes. */
1117 sdbout_parms (parms)
1120 for (; parms; parms = TREE_CHAIN (parms))
1121 if (DECL_NAME (parms))
1123 int current_sym_value = 0;
1124 char *name = IDENTIFIER_POINTER (DECL_NAME (parms));
1126 if (name == 0 || *name == 0)
1127 name = gen_fake_label ();
1129 /* Perform any necessary register eliminations on the parameter's rtl,
1130 so that the debugging output will be accurate. */
1131 DECL_INCOMING_RTL (parms) =
1132 eliminate_regs (DECL_INCOMING_RTL (parms), 0, NULL_RTX);
1133 DECL_RTL (parms) = eliminate_regs (DECL_RTL (parms), 0, NULL_RTX);
1135 if (PARM_PASSED_IN_MEMORY (parms))
1137 rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0);
1140 /* ??? Here we assume that the parm address is indexed
1141 off the frame pointer or arg pointer.
1142 If that is not true, we produce meaningless results,
1143 but do not crash. */
1144 if (GET_CODE (addr) == PLUS
1145 && GET_CODE (XEXP (addr, 1)) == CONST_INT)
1146 current_sym_value = INTVAL (XEXP (addr, 1));
1148 current_sym_value = 0;
1150 if (GET_CODE (DECL_RTL (parms)) == REG
1151 && REGNO (DECL_RTL (parms)) >= 0
1152 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
1153 type = DECL_ARG_TYPE (parms);
1156 int original_sym_value = current_sym_value;
1158 /* This is the case where the parm is passed as an int or
1159 double and it is converted to a char, short or float
1160 and stored back in the parmlist. In this case, describe
1161 the parm with the variable's declared type, and adjust
1162 the address if the least significant bytes (which we are
1163 using) are not the first ones. */
1164 #if BYTES_BIG_ENDIAN
1165 if (TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
1166 current_sym_value +=
1167 (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
1168 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
1170 if (GET_CODE (DECL_RTL (parms)) == MEM
1171 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
1172 && (GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1))
1174 && (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1))
1175 == current_sym_value))
1176 type = TREE_TYPE (parms);
1179 current_sym_value = original_sym_value;
1180 type = DECL_ARG_TYPE (parms);
1185 PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, addr));
1186 PUT_SDB_SCL (C_ARG);
1187 PUT_SDB_TYPE (plain_type (type));
1190 else if (GET_CODE (DECL_RTL (parms)) == REG)
1193 /* Parm passed in registers and lives in registers or nowhere. */
1195 /* If parm lives in a register, use that register;
1196 pretend the parm was passed there. It would be more consistent
1197 to describe the register where the parm was passed,
1198 but in practice that register usually holds something else. */
1199 if (REGNO (DECL_RTL (parms)) >= 0
1200 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
1201 best_rtl = DECL_RTL (parms);
1202 /* If the parm lives nowhere,
1203 use the register where it was passed. */
1205 best_rtl = DECL_INCOMING_RTL (parms);
1208 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (best_rtl)));
1209 PUT_SDB_SCL (C_REGPARM);
1210 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms), 0));
1213 else if (GET_CODE (DECL_RTL (parms)) == MEM
1214 && XEXP (DECL_RTL (parms), 0) != const0_rtx)
1216 /* Parm was passed in registers but lives on the stack. */
1218 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))),
1219 in which case we want the value of that CONST_INT,
1220 or (MEM (REG ...)) or (MEM (MEM ...)),
1221 in which case we use a value of zero. */
1222 if (GET_CODE (XEXP (DECL_RTL (parms), 0)) == REG
1223 || GET_CODE (XEXP (DECL_RTL (parms), 0)) == MEM)
1224 current_sym_value = 0;
1226 current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
1228 /* Again, this assumes the offset is based on the arg pointer. */
1230 PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value,
1231 XEXP (DECL_RTL (parms), 0)));
1232 PUT_SDB_SCL (C_ARG);
1233 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms), 0));
1239 /* Output definitions for the places where parms live during the function,
1240 when different from where they were passed, when the parms were passed
1243 It is not useful to do this for parms passed in registers
1244 that live during the function in different registers, because it is
1245 impossible to look in the passed register for the passed value,
1246 so we use the within-the-function register to begin with.
1248 PARMS is a chain of PARM_DECL nodes. */
1251 sdbout_reg_parms (parms)
1254 for (; parms; parms = TREE_CHAIN (parms))
1255 if (DECL_NAME (parms))
1257 char *name = IDENTIFIER_POINTER (DECL_NAME (parms));
1259 /* Report parms that live in registers during the function
1260 but were passed in memory. */
1261 if (GET_CODE (DECL_RTL (parms)) == REG
1262 && REGNO (DECL_RTL (parms)) >= 0
1263 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER
1264 && PARM_PASSED_IN_MEMORY (parms))
1266 if (name == 0 || *name == 0)
1267 name = gen_fake_label ();
1269 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms))));
1270 PUT_SDB_SCL (C_REG);
1271 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms), 0));
1274 /* Report parms that live in memory but not where they were passed. */
1275 else if (GET_CODE (DECL_RTL (parms)) == MEM
1276 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
1277 && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
1278 && PARM_PASSED_IN_MEMORY (parms)
1279 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms)))
1281 #if 0 /* ??? It is not clear yet what should replace this. */
1282 int offset = DECL_OFFSET (parms) / BITS_PER_UNIT;
1283 /* A parm declared char is really passed as an int,
1284 so it occupies the least significant bytes.
1285 On a big-endian machine those are not the low-numbered ones. */
1286 #if BYTES_BIG_ENDIAN
1287 if (offset != -1 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
1288 offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
1289 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
1291 if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...}
1294 if (name == 0 || *name == 0)
1295 name = gen_fake_label ();
1297 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET
1298 (XEXP (DECL_RTL (parms), 0)));
1299 PUT_SDB_SCL (C_AUTO);
1300 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms)));
1307 /* Describe the beginning of an internal block within a function.
1308 Also output descriptions of variables defined in this block.
1310 N is the number of the block, by order of beginning, counting from 1,
1311 and not counting the outermost (function top-level) block.
1312 The blocks match the BLOCKs in DECL_INITIAL (current_function_decl),
1313 if the count starts at 0 for the outermost one. */
1316 sdbout_begin_block (file, line, n)
1321 tree decl = current_function_decl;
1322 MAKE_LINE_SAFE (line);
1323 PUT_SDB_BLOCK_START (line - sdb_begin_function_line);
1326 /* Include the outermost BLOCK's variables in block 1. */
1327 next_block_number = 0;
1329 sdbout_block (DECL_INITIAL (decl));
1331 /* If -g1, suppress all the internal symbols of functions
1332 except for arguments. */
1333 if (debug_info_level != DINFO_LEVEL_TERSE)
1335 next_block_number = 0;
1337 sdbout_block (DECL_INITIAL (decl));
1340 #ifdef SDB_ALLOW_FORWARD_REFERENCES
1341 sdbout_dequeue_anonymous_types ();
1345 /* Describe the end line-number of an internal block within a function. */
1348 sdbout_end_block (file, line)
1352 MAKE_LINE_SAFE (line);
1353 PUT_SDB_BLOCK_END (line - sdb_begin_function_line);
1356 /* Output sdb info for the current function name.
1357 Called from assemble_start_function. */
1360 sdbout_mark_begin_function ()
1362 sdbout_symbol (current_function_decl, 0);
1365 /* Called at beginning of function body (after prologue).
1366 Record the function's starting line number, so we can output
1367 relative line numbers for the other lines.
1368 Describe beginning of outermost block.
1369 Also describe the parameter list. */
1372 sdbout_begin_function (line)
1375 sdb_begin_function_line = line - 1;
1376 PUT_SDB_FUNCTION_START (line);
1377 sdbout_parms (DECL_ARGUMENTS (current_function_decl));
1378 sdbout_reg_parms (DECL_ARGUMENTS (current_function_decl));
1381 /* Called at end of function (before epilogue).
1382 Describe end of outermost block. */
1385 sdbout_end_function (line)
1388 #ifdef SDB_ALLOW_FORWARD_REFERENCES
1389 sdbout_dequeue_anonymous_types ();
1392 MAKE_LINE_SAFE (line);
1393 PUT_SDB_FUNCTION_END (line - sdb_begin_function_line);
1395 /* Indicate we are between functions, for line-number output. */
1396 sdb_begin_function_line = -1;
1399 /* Output sdb info for the absolute end of a function.
1400 Called after the epilogue is output. */
1403 sdbout_end_epilogue ()
1405 char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
1406 PUT_SDB_EPILOGUE_END (name);
1409 /* Output sdb info for the given label. Called only if LABEL_NAME (insn)
1416 PUT_SDB_DEF (LABEL_NAME (insn));
1418 PUT_SDB_SCL (C_LABEL);
1419 PUT_SDB_TYPE (T_NULL);
1423 #endif /* SDB_DEBUGGING_INFO */