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1 /* Output dbx-format symbol table information from GNU compiler.
2 Copyright (C) 1987, 1988, 1992 Free Software Foundation, Inc.
3
4 This file is part of GNU CC.
5
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)
9 any later version.
10
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.
15
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. */
19
20
21 /* Output dbx-format symbol table data.
22 This consists of many symbol table entries, each of them
23 a .stabs assembler pseudo-op with four operands:
24 a "name" which is really a description of one symbol and its type,
25 a "code", which is a symbol defined in stab.h whose name starts with N_,
26 an unused operand always 0,
27 and a "value" which is an address or an offset.
28 The name is enclosed in doublequote characters.
29
30 Each function, variable, typedef, and structure tag
31 has a symbol table entry to define it.
32 The beginning and end of each level of name scoping within
33 a function are also marked by special symbol table entries.
34
35 The "name" consists of the symbol name, a colon, a kind-of-symbol letter,
36 and a data type number. The data type number may be followed by
37 "=" and a type definition; normally this will happen the first time
38 the type number is mentioned. The type definition may refer to
39 other types by number, and those type numbers may be followed
40 by "=" and nested definitions.
41
42 This can make the "name" quite long.
43 When a name is more than 80 characters, we split the .stabs pseudo-op
44 into two .stabs pseudo-ops, both sharing the same "code" and "value".
45 The first one is marked as continued with a double-backslash at the
46 end of its "name".
47
48 The kind-of-symbol letter distinguished function names from global
49 variables from file-scope variables from parameters from auto
50 variables in memory from typedef names from register variables.
51 See `dbxout_symbol'.
52
53 The "code" is mostly redundant with the kind-of-symbol letter
54 that goes in the "name", but not entirely: for symbols located
55 in static storage, the "code" says which segment the address is in,
56 which controls how it is relocated.
57
58 The "value" for a symbol in static storage
59 is the core address of the symbol (actually, the assembler
60 label for the symbol). For a symbol located in a stack slot
61 it is the stack offset; for one in a register, the register number.
62 For a typedef symbol, it is zero.
63
64 If DEBUG_SYMS_TEXT is defined, all debugging symbols must be
65 output while in the text section.
66
67 For more on data type definitions, see `dbxout_type'. */
68
69 /* Include these first, because they may define MIN and MAX. */
70 #include <stdio.h>
71 #include <errno.h>
72
73 #include "config.h"
74 #include "tree.h"
75 #include "rtl.h"
76 #include "flags.h"
77 #include "regs.h"
78 #include "insn-config.h"
79 #include "reload.h"
80
81 #ifndef errno
82 extern int errno;
83 #endif
84
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h"
87 #endif
88
89 #ifndef ASM_STABS_OP
90 #define ASM_STABS_OP ".stabs"
91 #endif
92
93 #ifndef ASM_STABN_OP
94 #define ASM_STABN_OP ".stabn"
95 #endif
96
97 #ifndef DBX_DECL_STABS_CODE
98 #define DBX_DECL_STABS_CODE N_LSYM
99 #endif
100
101 #ifndef DBX_STATIC_CONST_VAR_CODE
102 #define DBX_STATIC_CONST_VAR_CODE N_FUN
103 #endif
104
105 #ifndef DBX_REGPARM_STABS_CODE
106 #define DBX_REGPARM_STABS_CODE N_RSYM
107 #endif
108
109 #ifndef DBX_REGPARM_STABS_LETTER
110 #define DBX_REGPARM_STABS_LETTER 'P'
111 #endif
112
113 /* Nonzero means if the type has methods, only output debugging
114 information if methods are actually written to the asm file. */
115
116 static int flag_minimal_debug = 1;
117
118 /* Nonzero if we have actually used any of the GDB extensions
119 to the debugging format. The idea is that we use them for the
120 first time only if there's a strong reason, but once we have done that,
121 we use them whenever convenient. */
122
123 static int have_used_extensions = 0;
124
125 char *getpwd ();
126
127 /* Typical USG systems don't have stab.h, and they also have
128 no use for DBX-format debugging info. */
129
130 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
131
132 #ifdef DEBUG_SYMS_TEXT
133 #define FORCE_TEXT text_section ();
134 #else
135 #define FORCE_TEXT
136 #endif
137
138 #if defined (USG) || defined (NO_STAB_H)
139 #include "gstab.h" /* If doing DBX on sysV, use our own stab.h. */
140 #else
141 #include <stab.h> /* On BSD, use the system's stab.h. */
142
143 /* This is a GNU extension we need to reference in this file. */
144 #ifndef N_CATCH
145 #define N_CATCH 0x54
146 #endif
147 #endif /* not USG */
148
149 #ifdef __GNU_STAB__
150 #define STAB_CODE_TYPE enum __stab_debug_code
151 #else
152 #define STAB_CODE_TYPE int
153 #endif
154
155 /* 1 if PARM is passed to this function in memory. */
156
157 #define PARM_PASSED_IN_MEMORY(PARM) \
158 (GET_CODE (DECL_INCOMING_RTL (PARM)) == MEM)
159
160 /* A C expression for the integer offset value of an automatic variable
161 (N_LSYM) having address X (an RTX). */
162 #ifndef DEBUGGER_AUTO_OFFSET
163 #define DEBUGGER_AUTO_OFFSET(X) \
164 (GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0)
165 #endif
166
167 /* A C expression for the integer offset value of an argument (N_PSYM)
168 having address X (an RTX). The nominal offset is OFFSET. */
169 #ifndef DEBUGGER_ARG_OFFSET
170 #define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET)
171 #endif
172
173 /* Stream for writing to assembler file. */
174
175 static FILE *asmfile;
176
177 /* Last source file name mentioned in a NOTE insn. */
178
179 static char *lastfile;
180
181 /* Current working directory. */
182
183 static char *cwd;
184
185 enum typestatus {TYPE_UNSEEN, TYPE_XREF, TYPE_DEFINED};
186
187 /* Vector recording the status of describing C data types.
188 When we first notice a data type (a tree node),
189 we assign it a number using next_type_number.
190 That is its index in this vector.
191 The vector element says whether we have yet output
192 the definition of the type. TYPE_XREF says we have
193 output it as a cross-reference only. */
194
195 enum typestatus *typevec;
196
197 /* Number of elements of space allocated in `typevec'. */
198
199 static int typevec_len;
200
201 /* In dbx output, each type gets a unique number.
202 This is the number for the next type output.
203 The number, once assigned, is in the TYPE_SYMTAB_ADDRESS field. */
204
205 static int next_type_number;
206
207 /* In dbx output, we must assign symbol-blocks id numbers
208 in the order in which their beginnings are encountered.
209 We output debugging info that refers to the beginning and
210 end of the ranges of code in each block
211 with assembler labels LBBn and LBEn, where n is the block number.
212 The labels are generated in final, which assigns numbers to the
213 blocks in the same way. */
214
215 static int next_block_number;
216
217 /* These variables are for dbxout_symbol to communicate to
218 dbxout_finish_symbol.
219 current_sym_code is the symbol-type-code, a symbol N_... define in stab.h.
220 current_sym_value and current_sym_addr are two ways to address the
221 value to store in the symtab entry.
222 current_sym_addr if nonzero represents the value as an rtx.
223 If that is zero, current_sym_value is used. This is used
224 when the value is an offset (such as for auto variables,
225 register variables and parms). */
226
227 static STAB_CODE_TYPE current_sym_code;
228 static int current_sym_value;
229 static rtx current_sym_addr;
230
231 /* Number of chars of symbol-description generated so far for the
232 current symbol. Used by CHARS and CONTIN. */
233
234 static int current_sym_nchars;
235
236 /* Report having output N chars of the current symbol-description. */
237
238 #define CHARS(N) (current_sym_nchars += (N))
239
240 /* Break the current symbol-description, generating a continuation,
241 if it has become long. */
242
243 #ifndef DBX_CONTIN_LENGTH
244 #define DBX_CONTIN_LENGTH 80
245 #endif
246
247 #if DBX_CONTIN_LENGTH > 0
248 #define CONTIN \
249 do {if (current_sym_nchars > DBX_CONTIN_LENGTH) dbxout_continue ();} while (0)
250 #else
251 #define CONTIN
252 #endif
253
254 void dbxout_types ();
255 void dbxout_args ();
256 void dbxout_symbol ();
257 static void dbxout_type_name ();
258 static void dbxout_type ();
259 static void dbxout_typedefs ();
260 static void dbxout_prepare_symbol ();
261 static void dbxout_finish_symbol ();
262 static void dbxout_continue ();
263 static void print_int_cst_octal ();
264 static void print_octal ();
265 \f
266 #if 0 /* Not clear we will actually need this. */
267
268 /* Return the absolutized filename for the given relative
269 filename. Note that if that filename is already absolute, it may
270 still be returned in a modified form because this routine also
271 eliminates redundant slashes and single dots and eliminates double
272 dots to get a shortest possible filename from the given input
273 filename. The absolutization of relative filenames is made by
274 assuming that the given filename is to be taken as relative to
275 the first argument (cwd) or to the current directory if cwd is
276 NULL. */
277
278 static char *
279 abspath (rel_filename)
280 char *rel_filename;
281 {
282 /* Setup the current working directory as needed. */
283 char *abs_buffer
284 = (char *) alloca (strlen (cwd) + strlen (rel_filename) + 1);
285 char *endp = abs_buffer;
286 char *outp, *inp;
287 char *value;
288
289 /* Copy the filename (possibly preceded by the current working
290 directory name) into the absolutization buffer. */
291
292 {
293 char *src_p;
294
295 if (rel_filename[0] != '/')
296 {
297 src_p = cwd;
298 while (*endp++ = *src_p++)
299 continue;
300 *(endp-1) = '/'; /* overwrite null */
301 }
302 src_p = rel_filename;
303 while (*endp++ = *src_p++)
304 continue;
305 if (endp[-1] == '/')
306 *endp = '\0';
307
308 /* Now make a copy of abs_buffer into abs_buffer, shortening the
309 filename (by taking out slashes and dots) as we go. */
310
311 outp = inp = abs_buffer;
312 *outp++ = *inp++; /* copy first slash */
313 for (;;)
314 {
315 if (!inp[0])
316 break;
317 else if (inp[0] == '/' && outp[-1] == '/')
318 {
319 inp++;
320 continue;
321 }
322 else if (inp[0] == '.' && outp[-1] == '/')
323 {
324 if (!inp[1])
325 break;
326 else if (inp[1] == '/')
327 {
328 inp += 2;
329 continue;
330 }
331 else if ((inp[1] == '.') && (inp[2] == 0 || inp[2] == '/'))
332 {
333 inp += (inp[2] == '/') ? 3 : 2;
334 outp -= 2;
335 while (outp >= abs_buffer && *outp != '/')
336 outp--;
337 if (outp < abs_buffer)
338 {
339 /* Catch cases like /.. where we try to backup to a
340 point above the absolute root of the logical file
341 system. */
342
343 fprintf (stderr, "%s: invalid file name: %s\n",
344 pname, rel_filename);
345 exit (1);
346 }
347 *++outp = '\0';
348 continue;
349 }
350 }
351 *outp++ = *inp++;
352 }
353
354 /* On exit, make sure that there is a trailing null, and make sure that
355 the last character of the returned string is *not* a slash. */
356
357 *outp = '\0';
358 if (outp[-1] == '/')
359 *--outp = '\0';
360
361 /* Make a copy (in the heap) of the stuff left in the absolutization
362 buffer and return a pointer to the copy. */
363
364 value = (char *) oballoc (strlen (abs_buffer) + 1);
365 strcpy (value, abs_buffer);
366 return value;
367 }
368 #endif /* 0 */
369 \f
370 /* At the beginning of compilation, start writing the symbol table.
371 Initialize `typevec' and output the standard data types of C. */
372
373 void
374 dbxout_init (asm_file, input_file_name, syms)
375 FILE *asm_file;
376 char *input_file_name;
377 tree syms;
378 {
379 char ltext_label_name[100];
380
381 asmfile = asm_file;
382
383 typevec_len = 100;
384 typevec = (enum typestatus *) xmalloc (typevec_len * sizeof typevec[0]);
385 bzero (typevec, typevec_len * sizeof typevec[0]);
386
387 /* Convert Ltext into the appropriate format for local labels in case
388 the system doesn't insert underscores in front of user generated
389 labels. */
390 ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext", 0);
391
392 /* Put the current working directory in an N_SO symbol. */
393 #ifndef DBX_WORKING_DIRECTORY /* Only some versions of DBX want this,
394 but GDB always does. */
395 if (use_gdb_dbx_extensions)
396 #endif
397 {
398 if (cwd || (cwd = getpwd ()))
399 {
400 #ifdef DBX_OUTPUT_MAIN_SOURCE_DIRECTORY
401 DBX_OUTPUT_MAIN_SOURCE_DIRECTORY (asmfile, cwd);
402 #else /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
403 fprintf (asmfile, "%s \"%s/\",%d,0,0,%s\n", ASM_STABS_OP,
404 cwd, N_SO, &ltext_label_name[1]);
405 #endif /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
406 }
407 }
408
409 #ifdef DBX_OUTPUT_MAIN_SOURCE_FILENAME
410 /* This should NOT be DBX_OUTPUT_SOURCE_FILENAME. That
411 would give us an N_SOL, and we want an N_SO. */
412 DBX_OUTPUT_MAIN_SOURCE_FILENAME (asmfile, input_file_name);
413 #else /* no DBX_OUTPUT_MAIN_SOURCE_FILENAME */
414 /* We include outputting `Ltext:' here,
415 because that gives you a way to override it. */
416 /* Used to put `Ltext:' before the reference, but that loses on sun 4. */
417 fprintf (asmfile, "%s \"%s\",%d,0,0,%s\n", ASM_STABS_OP, input_file_name,
418 N_SO, &ltext_label_name[1]);
419 text_section ();
420 ASM_OUTPUT_INTERNAL_LABEL (asmfile, "Ltext", 0);
421 #endif /* no DBX_OUTPUT_MAIN_SOURCE_FILENAME */
422
423 lastfile = input_file_name;
424
425 next_type_number = 1;
426 next_block_number = 2;
427
428 /* Make sure that types `int' and `char' have numbers 1 and 2.
429 Definitions of other integer types will refer to those numbers.
430 (Actually it should no longer matter what their numbers are.
431 Also, if any types with tags have been defined, dbxout_symbol
432 will output them first, so the numbers won't be 1 and 2. That
433 happens in C++. So it's a good thing it should no longer matter). */
434
435 #ifdef DBX_OUTPUT_STANDARD_TYPES
436 DBX_OUTPUT_STANDARD_TYPES (syms);
437 #else
438 dbxout_symbol (TYPE_NAME (integer_type_node), 0);
439 dbxout_symbol (TYPE_NAME (char_type_node), 0);
440 #endif
441
442 /* Get all permanent types that have typedef names,
443 and output them all, except for those already output. */
444
445 dbxout_typedefs (syms);
446 }
447
448 /* Output any typedef names for types described by TYPE_DECLs in SYMS,
449 in the reverse order from that which is found in SYMS. */
450
451 static void
452 dbxout_typedefs (syms)
453 tree syms;
454 {
455 if (syms)
456 {
457 dbxout_typedefs (TREE_CHAIN (syms));
458 if (TREE_CODE (syms) == TYPE_DECL)
459 {
460 tree type = TREE_TYPE (syms);
461 if (TYPE_NAME (type)
462 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
463 && ! TREE_ASM_WRITTEN (TYPE_NAME (type)))
464 dbxout_symbol (TYPE_NAME (type), 0);
465 }
466 }
467 }
468
469 /* Output debugging info to FILE to switch to sourcefile FILENAME. */
470
471 void
472 dbxout_source_file (file, filename)
473 FILE *file;
474 char *filename;
475 {
476 char ltext_label_name[100];
477
478 if (filename && (lastfile == 0 || strcmp (filename, lastfile)))
479 {
480 #ifdef DBX_OUTPUT_SOURCE_FILENAME
481 DBX_OUTPUT_SOURCE_FILENAME (file, filename);
482 #else
483 ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext", 0);
484 fprintf (file, "%s \"%s\",%d,0,0,%s\n", ASM_STABS_OP,
485 filename, N_SOL, &ltext_label_name[1]);
486 #endif
487 lastfile = filename;
488 }
489 }
490
491 /* At the end of compilation, finish writing the symbol table.
492 Unless you define DBX_OUTPUT_MAIN_SOURCE_FILE_END, the default is
493 to do nothing. */
494
495 void
496 dbxout_finish (file, filename)
497 FILE *file;
498 char *filename;
499 {
500 #ifdef DBX_OUTPUT_MAIN_SOURCE_FILE_END
501 DBX_OUTPUT_MAIN_SOURCE_FILE_END (file, filename);
502 #endif /* DBX_OUTPUT_MAIN_SOURCE_FILE_END */
503 }
504
505 /* Continue a symbol-description that gets too big.
506 End one symbol table entry with a double-backslash
507 and start a new one, eventually producing something like
508 .stabs "start......\\",code,0,value
509 .stabs "...rest",code,0,value */
510
511 static void
512 dbxout_continue ()
513 {
514 #ifdef DBX_CONTIN_CHAR
515 fprintf (asmfile, "%c", DBX_CONTIN_CHAR);
516 #else
517 fprintf (asmfile, "\\\\");
518 #endif
519 dbxout_finish_symbol (0);
520 fprintf (asmfile, "%s \"", ASM_STABS_OP);
521 current_sym_nchars = 0;
522 }
523 \f
524 /* Subtroutine of `dbxout_type'. Output the type fields of TYPE.
525 This must be a separate function because anonymous unions require
526 recursive calls. */
527
528 static void
529 dbxout_type_fields (type)
530 tree type;
531 {
532 tree tem;
533 for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
534 {
535 /* Output the name, type, position (in bits), size (in bits)
536 of each field. */
537 if (DECL_NAME (tem) == NULL_TREE
538 && TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE)
539 dbxout_type_fields (TREE_TYPE (tem));
540 /* Omit here local type decls until we know how to support them. */
541 else if (TREE_CODE (tem) == TYPE_DECL)
542 continue;
543 /* Omit here the nameless fields that are used to skip bits. */
544 else if (DECL_NAME (tem) != 0 && TREE_CODE (tem) != CONST_DECL)
545 {
546 /* Continue the line if necessary,
547 but not before the first field. */
548 if (tem != TYPE_FIELDS (type))
549 CONTIN;
550
551 if (use_gdb_dbx_extensions
552 && flag_minimal_debug
553 && TREE_CODE (tem) == FIELD_DECL
554 && DECL_VIRTUAL_P (tem)
555 && DECL_ASSEMBLER_NAME (tem))
556 {
557 have_used_extensions = 1;
558 CHARS (3 + IDENTIFIER_LENGTH (DECL_NAME (TYPE_NAME (DECL_FCONTEXT (tem)))));
559 fputs (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (tem)), asmfile);
560 dbxout_type (DECL_FCONTEXT (tem), 0, 0);
561 fprintf (asmfile, ":");
562 dbxout_type (TREE_TYPE (tem), 0, 0);
563 fprintf (asmfile, ",%d;",
564 TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)));
565 continue;
566 }
567
568 fprintf (asmfile, "%s:", IDENTIFIER_POINTER (DECL_NAME (tem)));
569 CHARS (2 + IDENTIFIER_LENGTH (DECL_NAME (tem)));
570
571 if (use_gdb_dbx_extensions
572 && (TREE_PRIVATE (tem) || TREE_PROTECTED (tem)
573 || TREE_CODE (tem) != FIELD_DECL))
574 {
575 have_used_extensions = 1;
576 putc ('/', asmfile);
577 putc ((TREE_PRIVATE (tem) ? '0'
578 : TREE_PROTECTED (tem) ? '1' : '2'),
579 asmfile);
580 CHARS (2);
581 }
582
583 dbxout_type ((TREE_CODE (tem) == FIELD_DECL
584 && DECL_BIT_FIELD_TYPE (tem))
585 ? DECL_BIT_FIELD_TYPE (tem)
586 : TREE_TYPE (tem), 0, 0);
587
588 if (TREE_CODE (tem) == VAR_DECL)
589 {
590 if (TREE_STATIC (tem) && use_gdb_dbx_extensions)
591 {
592 char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (tem));
593 have_used_extensions = 1;
594 fprintf (asmfile, ":%s;", name);
595 CHARS (strlen (name));
596 }
597 else
598 {
599 /* If TEM is non-static, GDB won't understand it. */
600 fprintf (asmfile, ",0,0;");
601 }
602 }
603 else if (TREE_CODE (DECL_FIELD_BITPOS (tem)) == INTEGER_CST)
604 {
605 fprintf (asmfile, ",%d,%d;",
606 TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)),
607 TREE_INT_CST_LOW (DECL_SIZE (tem)));
608 }
609 else
610 /* This has yet to be implemented. */
611 abort ();
612 CHARS (23);
613 }
614 }
615 }
616 \f
617 /* Subtroutine of `dbxout_type_methods'. Output debug info about the
618 method described DECL. DEBUG_NAME is an encoding of the method's
619 type signature. ??? We may be able to do without DEBUG_NAME altogether
620 now. */
621
622 static void
623 dbxout_type_method_1 (decl, debug_name)
624 tree decl;
625 char *debug_name;
626 {
627 tree firstarg = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)));
628 char c1 = 'A', c2;
629
630 if (TREE_CODE (TREE_TYPE (decl)) == FUNCTION_TYPE)
631 c2 = '?';
632 else /* it's a METHOD_TYPE. */
633 {
634 /* A for normal functions.
635 B for `const' member functions.
636 C for `volatile' member functions.
637 D for `const volatile' member functions. */
638 if (TYPE_READONLY (TREE_TYPE (firstarg)))
639 c1 += 1;
640 if (TYPE_VOLATILE (TREE_TYPE (firstarg)))
641 c1 += 2;
642
643 if (DECL_VINDEX (decl))
644 c2 = '*';
645 else
646 c2 = '.';
647 }
648
649 fprintf (asmfile, ":%s;%c%c%c", debug_name,
650 TREE_PRIVATE (decl) ? '0' : TREE_PROTECTED (decl) ? '1' : '2', c1, c2);
651 CHARS (IDENTIFIER_LENGTH (DECL_ASSEMBLER_NAME (decl)) + 6
652 - (debug_name - IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
653 if (DECL_VINDEX (decl))
654 {
655 fprintf (asmfile, "%d;",
656 TREE_INT_CST_LOW (DECL_VINDEX (decl)));
657 dbxout_type (DECL_CONTEXT (decl), 0, 0);
658 fprintf (asmfile, ";");
659 CHARS (8);
660 }
661 }
662 \f
663 /* Subroutine of `dbxout_type'. Output debug info about the methods defined
664 in TYPE. */
665
666 static void
667 dbxout_type_methods (type)
668 register tree type;
669 {
670 /* C++: put out the method names and their parameter lists */
671 tree methods = TYPE_METHODS (type);
672 tree type_encoding;
673 register tree fndecl;
674 register tree last;
675 register int type_identifier_length;
676
677 if (methods == NULL_TREE)
678 return;
679
680 type_encoding = DECL_NAME (TYPE_NAME (type));
681
682 /* C++: Template classes break some assumptions made by this code about
683 the class names, constructor names, and encodings for assembler
684 label names. For now, disable output of dbx info for them. */
685 {
686 char *ptr = IDENTIFIER_POINTER (type_encoding);
687 /* Avoid strchr or index since those names aren't universal. */
688 while (*ptr && *ptr != '<') ptr++;
689 if (*ptr != 0)
690 {
691 static int warned;
692 if (!warned)
693 {
694 warned = 1;
695 warning ("dbx info for template class methods not yet supported");
696 }
697 return;
698 }
699 }
700
701 type_identifier_length = IDENTIFIER_LENGTH (type_encoding);
702
703 if (TREE_CODE (methods) == FUNCTION_DECL)
704 fndecl = methods;
705 else if (TREE_VEC_ELT (methods, 0) != NULL_TREE)
706 fndecl = TREE_VEC_ELT (methods, 0);
707 else fndecl = TREE_VEC_ELT (methods, 1);
708
709 while (fndecl)
710 {
711 tree name = DECL_NAME (fndecl);
712 int need_prefix = 1;
713
714 /* Group together all the methods for the same operation.
715 These differ in the types of the arguments. */
716 for (last = NULL_TREE;
717 fndecl && (last == NULL_TREE || DECL_NAME (fndecl) == DECL_NAME (last));
718 fndecl = TREE_CHAIN (fndecl))
719 /* Output the name of the field (after overloading), as
720 well as the name of the field before overloading, along
721 with its parameter list */
722 {
723 /* This is the "mangled" name of the method.
724 It encodes the argument types. */
725 char *debug_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl));
726 int destructor = 0;
727
728 CONTIN;
729
730 last = fndecl;
731
732 if (DECL_IGNORED_P (fndecl))
733 continue;
734
735 if (flag_minimal_debug)
736 {
737 /* Detect ordinary methods because their mangled names
738 start with the operation name. */
739 if (!strncmp (IDENTIFIER_POINTER (name), debug_name,
740 IDENTIFIER_LENGTH (name)))
741 {
742 debug_name += IDENTIFIER_LENGTH (name);
743 if (debug_name[0] == '_' && debug_name[1] == '_')
744 {
745 char *method_name = debug_name + 2;
746 /* Get past const and volatile qualifiers. */
747 while (*method_name == 'C' || *method_name == 'V')
748 method_name++;
749 if (! strncmp (method_name,
750 IDENTIFIER_POINTER (type_encoding),
751 type_identifier_length))
752 method_name += type_identifier_length;
753 debug_name = method_name;
754 }
755 }
756 /* Detect constructors by their style of name mangling. */
757 else if (debug_name[0] == '_' && debug_name[1] == '_')
758 {
759 char *ctor_name = debug_name + 2;
760 while (*ctor_name == 'C' || *ctor_name == 'V')
761 ctor_name++;
762 if (!strncmp (IDENTIFIER_POINTER (type_encoding), ctor_name,
763 type_identifier_length))
764 debug_name = ctor_name + type_identifier_length;
765 }
766 /* The other alternative is a destructor. */
767 else
768 destructor = 1;
769
770 /* Output the operation name just once, for the first method
771 that we output. */
772 if (need_prefix)
773 {
774 fprintf (asmfile, "%s::", IDENTIFIER_POINTER (name));
775 CHARS (IDENTIFIER_LENGTH (name) + 2);
776 need_prefix = 0;
777 }
778 }
779
780 dbxout_type (TREE_TYPE (fndecl), 0, destructor);
781
782 dbxout_type_method_1 (fndecl, debug_name);
783 }
784 putc (';', asmfile);
785 CHARS (1);
786 }
787 }
788 \f
789 /* Output a reference to a type. If the type has not yet been
790 described in the dbx output, output its definition now.
791 For a type already defined, just refer to its definition
792 using the type number.
793
794 If FULL is nonzero, and the type has been described only with
795 a forward-reference, output the definition now.
796 If FULL is zero in this case, just refer to the forward-reference
797 using the number previously allocated.
798
799 If SHOW_ARG_TYPES is nonzero, we output a description of the argument
800 types for a METHOD_TYPE. */
801
802 static void
803 dbxout_type (type, full, show_arg_types)
804 tree type;
805 int full;
806 int show_arg_types;
807 {
808 register tree tem;
809
810 /* If there was an input error and we don't really have a type,
811 avoid crashing and write something that is at least valid
812 by assuming `int'. */
813 if (type == error_mark_node)
814 type = integer_type_node;
815 else
816 {
817 type = TYPE_MAIN_VARIANT (type);
818 if (TYPE_NAME (type)
819 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
820 && DECL_IGNORED_P (TYPE_NAME (type)))
821 full = 0;
822 }
823
824 if (TYPE_SYMTAB_ADDRESS (type) == 0)
825 {
826 /* Type has no dbx number assigned. Assign next available number. */
827 TYPE_SYMTAB_ADDRESS (type) = next_type_number++;
828
829 /* Make sure type vector is long enough to record about this type. */
830
831 if (next_type_number == typevec_len)
832 {
833 typevec = (enum typestatus *) xrealloc (typevec, typevec_len * 2 * sizeof typevec[0]);
834 bzero (typevec + typevec_len, typevec_len * sizeof typevec[0]);
835 typevec_len *= 2;
836 }
837 }
838
839 /* Output the number of this type, to refer to it. */
840 fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
841 CHARS (3);
842
843 #ifdef DBX_TYPE_DEFINED
844 if (DBX_TYPE_DEFINED (type))
845 return;
846 #endif
847
848 /* If this type's definition has been output or is now being output,
849 that is all. */
850
851 switch (typevec[TYPE_SYMTAB_ADDRESS (type)])
852 {
853 case TYPE_UNSEEN:
854 break;
855 case TYPE_XREF:
856 if (! full)
857 return;
858 break;
859 case TYPE_DEFINED:
860 return;
861 }
862
863 #ifdef DBX_NO_XREFS
864 /* For systems where dbx output does not allow the `=xsNAME:' syntax,
865 leave the type-number completely undefined rather than output
866 a cross-reference. */
867 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
868 || TREE_CODE (type) == ENUMERAL_TYPE)
869
870 if ((TYPE_NAME (type) != 0 && !full)
871 || TYPE_SIZE (type) == 0)
872 {
873 typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
874 return;
875 }
876 #endif
877
878 /* Output a definition now. */
879
880 fprintf (asmfile, "=");
881 CHARS (1);
882
883 /* Mark it as defined, so that if it is self-referent
884 we will not get into an infinite recursion of definitions. */
885
886 typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_DEFINED;
887
888 switch (TREE_CODE (type))
889 {
890 case VOID_TYPE:
891 case LANG_TYPE:
892 /* For a void type, just define it as itself; ie, "5=5".
893 This makes us consider it defined
894 without saying what it is. The debugger will make it
895 a void type when the reference is seen, and nothing will
896 ever override that default. */
897 fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
898 CHARS (3);
899 break;
900
901 case INTEGER_TYPE:
902 if (type == char_type_node && ! TREE_UNSIGNED (type))
903 /* Output the type `char' as a subrange of itself!
904 I don't understand this definition, just copied it
905 from the output of pcc.
906 This used to use `r2' explicitly and we used to
907 take care to make sure that `char' was type number 2. */
908 fprintf (asmfile, "r%d;0;127;", TYPE_SYMTAB_ADDRESS (type));
909 #ifdef WINNING_GDB
910 else if (TYPE_PRECISION (type) > BITS_PER_WORD)
911 {
912 /* This used to say `r1' and we used to take care
913 to make sure that `int' was type number 1. */
914 fprintf (asmfile, "r%d;", TYPE_SYMTAB_ADDRESS (integer_type_node));
915 print_int_cst_octal (TYPE_MIN_VALUE (type));
916 fprintf (asmfile, ";");
917 print_int_cst_octal (TYPE_MAX_VALUE (type));
918 fprintf (asmfile, ";");
919 }
920 #endif
921 else
922 /* Output other integer types as subranges of `int'. */
923 /* This used to say `r1' and we used to take care
924 to make sure that `int' was type number 1. */
925 fprintf (asmfile, "r%d;%d;%d;",
926 TYPE_SYMTAB_ADDRESS (integer_type_node),
927 TREE_INT_CST_LOW (TYPE_MIN_VALUE (type)),
928 TREE_INT_CST_LOW (TYPE_MAX_VALUE (type)));
929 CHARS (25);
930 break;
931
932 case REAL_TYPE:
933 /* This used to say `r1' and we used to take care
934 to make sure that `int' was type number 1. */
935 fprintf (asmfile, "r%d;%d;0;", TYPE_SYMTAB_ADDRESS (integer_type_node),
936 TREE_INT_CST_LOW (size_in_bytes (type)));
937 CHARS (16);
938 break;
939
940 case ARRAY_TYPE:
941 /* Output "a" followed by a range type definition
942 for the index type of the array
943 followed by a reference to the target-type.
944 ar1;0;N;M for an array of type M and size N. */
945 /* This used to say `r1' and we used to take care
946 to make sure that `int' was type number 1. */
947 fprintf (asmfile, "ar%d;0;%d;", TYPE_SYMTAB_ADDRESS (integer_type_node),
948
949 (TYPE_DOMAIN (type)
950 ? TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))
951 : -1));
952 CHARS (17);
953 dbxout_type (TREE_TYPE (type), 0, 0);
954 break;
955
956 case RECORD_TYPE:
957 case UNION_TYPE:
958 {
959 int i, n_baseclasses = 0;
960
961 if (TYPE_BINFO (type) != 0 && TYPE_BINFO_BASETYPES (type) != 0)
962 n_baseclasses = TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type));
963
964 /* Output a structure type. */
965 if ((TYPE_NAME (type) != 0
966 #if 0 /* Tiemann says this creates output tha "confuses GDB".
967 Too bad the info is so vague. Hope this doesn't lose. */
968 && ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
969 && DECL_IGNORED_P (TYPE_NAME (type)))
970 #endif
971 && !full)
972 || TYPE_SIZE (type) == 0
973 /* No way in DBX fmt to describe a variable size. */
974 || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
975 {
976 /* If the type is just a cross reference, output one
977 and mark the type as partially described.
978 If it later becomes defined, we will output
979 its real definition.
980 If the type has a name, don't nest its definition within
981 another type's definition; instead, output an xref
982 and let the definition come when the name is defined. */
983 fprintf (asmfile, (TREE_CODE (type) == RECORD_TYPE) ? "xs" : "xu");
984 CHARS (3);
985 #if 0 /* This assertion is legitimately false in C++. */
986 /* We shouldn't be outputting a reference to a type before its
987 definition unless the type has a tag name.
988 A typedef name without a tag name should be impossible. */
989 if (TREE_CODE (TYPE_NAME (type)) != IDENTIFIER_NODE)
990 abort ();
991 #endif
992 dbxout_type_name (type);
993 fprintf (asmfile, ":");
994 typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
995 break;
996 }
997 tem = size_in_bytes (type);
998
999 /* Identify record or union, and print its size. */
1000 fprintf (asmfile, (TREE_CODE (type) == RECORD_TYPE) ? "s%d" : "u%d",
1001 TREE_INT_CST_LOW (tem));
1002
1003 if (use_gdb_dbx_extensions)
1004 {
1005 if (n_baseclasses)
1006 {
1007 have_used_extensions = 1;
1008 fprintf (asmfile, "!%d,", n_baseclasses);
1009 CHARS (8);
1010 }
1011 }
1012 for (i = 0; i < n_baseclasses; i++)
1013 {
1014 tree child = TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (type)), i);
1015 if (use_gdb_dbx_extensions)
1016 {
1017 have_used_extensions = 1;
1018 putc (TREE_VIA_VIRTUAL (child) ? '1'
1019 : '0',
1020 asmfile);
1021 putc (TREE_VIA_PUBLIC (child) ? '2'
1022 : '0',
1023 asmfile);
1024 fprintf (asmfile, "%d,",
1025 TREE_INT_CST_LOW (BINFO_OFFSET (child)) * BITS_PER_UNIT);
1026 CHARS (15);
1027 dbxout_type (BINFO_TYPE (child), 0, 0);
1028 putc (';', asmfile);
1029 }
1030 else
1031 {
1032 /* Print out the base class information with fields
1033 which have the same names at the types they hold. */
1034 dbxout_type_name (BINFO_TYPE (child));
1035 putc (':', asmfile);
1036 dbxout_type (BINFO_TYPE (child), full, 0);
1037 fprintf (asmfile, ",%d,%d;",
1038 TREE_INT_CST_LOW (BINFO_OFFSET (child)) * BITS_PER_UNIT,
1039 TREE_INT_CST_LOW (DECL_SIZE (TYPE_NAME (BINFO_TYPE (child)))) * BITS_PER_UNIT);
1040 CHARS (20);
1041 }
1042 }
1043 }
1044
1045 CHARS (11);
1046
1047 /* Write out the field declarations. */
1048 dbxout_type_fields (type);
1049 if (use_gdb_dbx_extensions && TYPE_METHODS (type) != NULL_TREE)
1050 {
1051 have_used_extensions = 1;
1052 dbxout_type_methods (type);
1053 }
1054 putc (';', asmfile);
1055
1056 if (use_gdb_dbx_extensions && TREE_CODE (type) == RECORD_TYPE
1057 /* Avoid the ~ if we don't really need it--it confuses dbx. */
1058 && TYPE_VFIELD (type))
1059 {
1060 have_used_extensions = 1;
1061
1062 /* Tell GDB+ that it may keep reading. */
1063 putc ('~', asmfile);
1064
1065 /* We need to write out info about what field this class
1066 uses as its "main" vtable pointer field, because if this
1067 field is inherited from a base class, GDB cannot necessarily
1068 figure out which field it's using in time. */
1069 if (TYPE_VFIELD (type))
1070 {
1071 putc ('%', asmfile);
1072 dbxout_type (DECL_FCONTEXT (TYPE_VFIELD (type)), 0, 0);
1073 }
1074 putc (';', asmfile);
1075 CHARS (3);
1076 }
1077 break;
1078
1079 case ENUMERAL_TYPE:
1080 if ((TYPE_NAME (type) != 0 && !full
1081 && (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
1082 && ! DECL_IGNORED_P (TYPE_NAME (type))))
1083 || TYPE_SIZE (type) == 0)
1084 {
1085 fprintf (asmfile, "xe");
1086 CHARS (3);
1087 dbxout_type_name (type);
1088 typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
1089 fprintf (asmfile, ":");
1090 return;
1091 }
1092 putc ('e', asmfile);
1093 CHARS (1);
1094 for (tem = TYPE_VALUES (type); tem; tem = TREE_CHAIN (tem))
1095 {
1096 fprintf (asmfile, "%s:%d,", IDENTIFIER_POINTER (TREE_PURPOSE (tem)),
1097 TREE_INT_CST_LOW (TREE_VALUE (tem)));
1098 CHARS (11 + IDENTIFIER_LENGTH (TREE_PURPOSE (tem)));
1099 if (TREE_CHAIN (tem) != 0)
1100 CONTIN;
1101 }
1102 putc (';', asmfile);
1103 CHARS (1);
1104 break;
1105
1106 case POINTER_TYPE:
1107 putc ('*', asmfile);
1108 CHARS (1);
1109 dbxout_type (TREE_TYPE (type), 0, 0);
1110 break;
1111
1112 case METHOD_TYPE:
1113 if (use_gdb_dbx_extensions)
1114 {
1115 have_used_extensions = 1;
1116 putc ('#', asmfile);
1117 CHARS (1);
1118 if (flag_minimal_debug && !show_arg_types)
1119 {
1120 /* Normally, just output the return type.
1121 The argument types are encoded in the method name. */
1122 putc ('#', asmfile);
1123 dbxout_type (TREE_TYPE (type), 0, 0);
1124 putc (';', asmfile);
1125 CHARS (1);
1126 }
1127 else
1128 {
1129 /* When outputing destructors, we need to write
1130 the argument types out longhand. */
1131 dbxout_type (TYPE_METHOD_BASETYPE (type), 0, 0);
1132 putc (',', asmfile);
1133 CHARS (1);
1134 dbxout_type (TREE_TYPE (type), 0, 0);
1135 dbxout_args (TYPE_ARG_TYPES (type));
1136 putc (';', asmfile);
1137 CHARS (1);
1138 }
1139 }
1140 else
1141 {
1142 /* Treat it as a function type. */
1143 dbxout_type (TREE_TYPE (type), 0, 0);
1144 }
1145 break;
1146
1147 case OFFSET_TYPE:
1148 if (use_gdb_dbx_extensions)
1149 {
1150 have_used_extensions = 1;
1151 putc ('@', asmfile);
1152 CHARS (1);
1153 dbxout_type (TYPE_OFFSET_BASETYPE (type), 0, 0);
1154 putc (',', asmfile);
1155 CHARS (1);
1156 dbxout_type (TREE_TYPE (type), 0, 0);
1157 }
1158 else
1159 {
1160 /* Should print as an int, because it is really
1161 just an offset. */
1162 dbxout_type (integer_type_node, 0, 0);
1163 }
1164 break;
1165
1166 case REFERENCE_TYPE:
1167 if (use_gdb_dbx_extensions)
1168 have_used_extensions = 1;
1169 putc (use_gdb_dbx_extensions ? '&' : '*', asmfile);
1170 CHARS (1);
1171 dbxout_type (TREE_TYPE (type), 0, 0);
1172 break;
1173
1174 case FUNCTION_TYPE:
1175 putc ('f', asmfile);
1176 CHARS (1);
1177 dbxout_type (TREE_TYPE (type), 0, 0);
1178 break;
1179
1180 default:
1181 abort ();
1182 }
1183 }
1184
1185 /* Print the value of integer constant C, in octal,
1186 handling double precision. */
1187
1188 static void
1189 print_int_cst_octal (c)
1190 tree c;
1191 {
1192 unsigned int high = TREE_INT_CST_HIGH (c);
1193 unsigned int low = TREE_INT_CST_LOW (c);
1194 int excess = (3 - (HOST_BITS_PER_INT % 3));
1195
1196 fprintf (asmfile, "0");
1197
1198 if (excess == 3)
1199 {
1200 print_octal (high, HOST_BITS_PER_INT / 3);
1201 print_octal (low, HOST_BITS_PER_INT / 3);
1202 }
1203 else
1204 {
1205 unsigned int beg = high >> excess;
1206 unsigned int middle
1207 = ((high & ((1 << excess) - 1)) << (3 - excess)
1208 | (low >> (HOST_BITS_PER_INT / 3 * 3)));
1209 unsigned int end = low & ((1 << (HOST_BITS_PER_INT / 3 * 3)) - 1);
1210 fprintf (asmfile, "%o%01o", beg, middle);
1211 print_octal (end, HOST_BITS_PER_INT / 3);
1212 }
1213 }
1214
1215 static void
1216 print_octal (value, digits)
1217 unsigned int value;
1218 int digits;
1219 {
1220 int i;
1221
1222 for (i = digits - 1; i >= 0; i--)
1223 fprintf (asmfile, "%01o", ((value >> (3 * i)) & 7));
1224 }
1225
1226 /* Output the name of type TYPE, with no punctuation.
1227 Such names can be set up either by typedef declarations
1228 or by struct, enum and union tags. */
1229
1230 static void
1231 dbxout_type_name (type)
1232 register tree type;
1233 {
1234 tree t;
1235 if (TYPE_NAME (type) == 0)
1236 abort ();
1237 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1238 {
1239 t = TYPE_NAME (type);
1240 }
1241 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
1242 {
1243 t = DECL_NAME (TYPE_NAME (type));
1244 }
1245 else
1246 abort ();
1247
1248 fprintf (asmfile, "%s", IDENTIFIER_POINTER (t));
1249 CHARS (IDENTIFIER_LENGTH (t));
1250 }
1251 \f
1252 /* Output a .stabs for the symbol defined by DECL,
1253 which must be a ..._DECL node in the normal namespace.
1254 It may be a CONST_DECL, a FUNCTION_DECL, a PARM_DECL or a VAR_DECL.
1255 LOCAL is nonzero if the scope is less than the entire file. */
1256
1257 void
1258 dbxout_symbol (decl, local)
1259 tree decl;
1260 int local;
1261 {
1262 int letter = 0;
1263 tree type = TREE_TYPE (decl);
1264 tree context = NULL_TREE;
1265 int regno = -1;
1266
1267 /* Cast avoids warning in old compilers. */
1268 current_sym_code = (STAB_CODE_TYPE) 0;
1269 current_sym_value = 0;
1270 current_sym_addr = 0;
1271
1272 /* Ignore nameless syms, but don't ignore type tags. */
1273
1274 if ((DECL_NAME (decl) == 0 && TREE_CODE (decl) != TYPE_DECL)
1275 || DECL_IGNORED_P (decl))
1276 return;
1277
1278 dbxout_prepare_symbol (decl);
1279
1280 /* The output will always start with the symbol name,
1281 so always count that in the length-output-so-far. */
1282
1283 if (DECL_NAME (decl) != 0)
1284 current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (decl));
1285
1286 switch (TREE_CODE (decl))
1287 {
1288 case CONST_DECL:
1289 /* Enum values are defined by defining the enum type. */
1290 break;
1291
1292 case FUNCTION_DECL:
1293 if (DECL_RTL (decl) == 0)
1294 return;
1295 if (TREE_EXTERNAL (decl))
1296 break;
1297 /* Don't mention a nested function under its parent. */
1298 context = decl_function_context (decl);
1299 if (context == current_function_decl)
1300 break;
1301 if (GET_CODE (DECL_RTL (decl)) != MEM
1302 || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
1303 break;
1304 FORCE_TEXT;
1305
1306 fprintf (asmfile, "%s \"%s:%c", ASM_STABS_OP,
1307 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
1308 TREE_PUBLIC (decl) ? 'F' : 'f');
1309
1310 current_sym_code = N_FUN;
1311 current_sym_addr = XEXP (DECL_RTL (decl), 0);
1312
1313 if (TREE_TYPE (type))
1314 dbxout_type (TREE_TYPE (type), 0, 0);
1315 else
1316 dbxout_type (void_type_node, 0, 0);
1317
1318 /* For a nested function, when that function is compiled,
1319 mention the containing function name
1320 as well as (since dbx wants it) our own assembler-name. */
1321 if (context != 0)
1322 fprintf (asmfile, ",%s,%s",
1323 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
1324 IDENTIFIER_POINTER (DECL_NAME (context)));
1325
1326 dbxout_finish_symbol (decl);
1327 break;
1328
1329 case TYPE_DECL:
1330 #if 0
1331 /* This seems all wrong. Outputting most kinds of types gives no name
1332 at all. A true definition gives no name; a cross-ref for a
1333 structure can give the tag name, but not a type name.
1334 It seems that no typedef name is defined by outputting a type. */
1335
1336 /* If this typedef name was defined by outputting the type,
1337 don't duplicate it. */
1338 if (typevec[TYPE_SYMTAB_ADDRESS (type)] == TYPE_DEFINED
1339 && TYPE_NAME (TREE_TYPE (decl)) == decl)
1340 return;
1341 #endif
1342 /* Don't output the same typedef twice.
1343 And don't output what language-specific stuff doesn't want output. */
1344 if (TREE_ASM_WRITTEN (decl) || DECL_IGNORED_P (decl))
1345 return;
1346
1347 FORCE_TEXT;
1348
1349 if (DECL_NAME (decl))
1350 {
1351 /* Output typedef name. */
1352 fprintf (asmfile, "%s \"%s:", ASM_STABS_OP,
1353 IDENTIFIER_POINTER (DECL_NAME (decl)));
1354
1355 /* If there is a typedecl for this type with the same name
1356 as the tag, output an abbreviated form for that typedecl. */
1357 if (use_gdb_dbx_extensions && have_used_extensions
1358 && (TREE_CODE (type) == RECORD_TYPE
1359 || TREE_CODE (type) == UNION_TYPE)
1360 && (TYPE_NAME (type) == decl))
1361 {
1362 putc ('T', asmfile);
1363 TREE_ASM_WRITTEN (TYPE_NAME (type)) = 1;
1364 }
1365 putc ('t', asmfile);
1366 current_sym_code = DBX_DECL_STABS_CODE;
1367
1368 dbxout_type (type, 1, 0);
1369 dbxout_finish_symbol (decl);
1370 }
1371 else if (TYPE_NAME (type) != 0 && !TREE_ASM_WRITTEN (TYPE_NAME (type)))
1372 {
1373 /* Output a tag (a TYPE_DECL with no name, but the type has a name).
1374 This is what represents `struct foo' with no typedef. */
1375 /* In C++, the name of a type is the corresponding typedef.
1376 In C, it is an IDENTIFIER_NODE. */
1377 tree name = TYPE_NAME (type);
1378 if (TREE_CODE (name) == TYPE_DECL)
1379 name = DECL_NAME (name);
1380
1381 current_sym_code = DBX_DECL_STABS_CODE;
1382 current_sym_value = 0;
1383 current_sym_addr = 0;
1384 current_sym_nchars = 2 + IDENTIFIER_LENGTH (name);
1385
1386 fprintf (asmfile, "%s \"%s:T", ASM_STABS_OP,
1387 IDENTIFIER_POINTER (name));
1388 dbxout_type (type, 1, 0);
1389 dbxout_finish_symbol (0);
1390 }
1391
1392 /* Prevent duplicate output of a typedef. */
1393 TREE_ASM_WRITTEN (decl) = 1;
1394 break;
1395
1396 case PARM_DECL:
1397 /* Parm decls go in their own separate chains
1398 and are output by dbxout_reg_parms and dbxout_parms. */
1399 abort ();
1400
1401 case RESULT_DECL:
1402 /* Named return value, treat like a VAR_DECL. */
1403 case VAR_DECL:
1404 if (DECL_RTL (decl) == 0)
1405 return;
1406 /* Don't mention a variable that is external.
1407 Let the file that defines it describe it. */
1408 if (TREE_EXTERNAL (decl))
1409 break;
1410
1411 /* If the variable is really a constant
1412 and not written in memory, inform the debugger. */
1413 if (TREE_STATIC (decl) && TREE_READONLY (decl)
1414 && DECL_INITIAL (decl) != 0
1415 && ! TREE_ASM_WRITTEN (decl)
1416 && (DECL_FIELD_CONTEXT (decl) == NULL_TREE
1417 || TREE_CODE (DECL_FIELD_CONTEXT (decl)) == BLOCK))
1418 {
1419 if (TREE_PUBLIC (decl) == 0)
1420 {
1421 /* The sun4 assembler does not grok this. */
1422 char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
1423 if (TREE_CODE (TREE_TYPE (decl)) == INTEGER_TYPE
1424 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
1425 {
1426 int ival = TREE_INT_CST_LOW (DECL_INITIAL (decl));
1427 #ifdef DBX_OUTPUT_CONSTANT_SYMBOL
1428 DBX_OUTPUT_CONSTANT_SYMBOL (asmfile, name, ival);
1429 #else
1430 fprintf (asmfile, "%s \"%s:c=i%d\",0x%x,0,0,0\n",
1431 ASM_STABS_OP, name, ival, N_LSYM);
1432 #endif
1433 return;
1434 }
1435 else if (TREE_CODE (TREE_TYPE (decl)) == REAL_TYPE)
1436 {
1437 /* don't know how to do this yet. */
1438 }
1439 break;
1440 }
1441 /* else it is something we handle like a normal variable. */
1442 }
1443
1444 DECL_RTL (decl) = eliminate_regs (DECL_RTL (decl));
1445 #ifdef LEAF_REG_REMAP
1446 if (leaf_function)
1447 leaf_renumber_regs_insn (DECL_RTL (decl));
1448 #endif
1449
1450 /* Don't mention a variable at all
1451 if it was completely optimized into nothingness.
1452
1453 If DECL was from an inline function, then it's rtl
1454 is not identically the rtl that was used in this
1455 particular compilation. */
1456 if (GET_CODE (DECL_RTL (decl)) == REG)
1457 {
1458 regno = REGNO (DECL_RTL (decl));
1459 if (regno >= FIRST_PSEUDO_REGISTER)
1460 regno = reg_renumber[REGNO (DECL_RTL (decl))];
1461 if (regno < 0)
1462 break;
1463 }
1464 else if (GET_CODE (DECL_RTL (decl)) == SUBREG)
1465 {
1466 rtx value = DECL_RTL (decl);
1467 int offset = 0;
1468 while (GET_CODE (value) == SUBREG)
1469 {
1470 offset += SUBREG_WORD (value);
1471 value = SUBREG_REG (value);
1472 }
1473 if (GET_CODE (value) == REG)
1474 {
1475 regno = REGNO (value);
1476 if (regno >= FIRST_PSEUDO_REGISTER)
1477 regno = reg_renumber[REGNO (value)];
1478 if (regno >= 0)
1479 regno += offset;
1480 }
1481 }
1482
1483 /* The kind-of-variable letter depends on where
1484 the variable is and on the scope of its name:
1485 G and N_GSYM for static storage and global scope,
1486 S for static storage and file scope,
1487 V for static storage and local scope,
1488 for those two, use N_LCSYM if data is in bss segment,
1489 N_STSYM if in data segment, N_FUN otherwise.
1490 (We used N_FUN originally, then changed to N_STSYM
1491 to please GDB. However, it seems that confused ld.
1492 Now GDB has been fixed to like N_FUN, says Kingdon.)
1493 no letter at all, and N_LSYM, for auto variable,
1494 r and N_RSYM for register variable. */
1495
1496 if (GET_CODE (DECL_RTL (decl)) == MEM
1497 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
1498 {
1499 if (TREE_PUBLIC (decl))
1500 {
1501 letter = 'G';
1502 current_sym_code = N_GSYM;
1503 }
1504 else
1505 {
1506 current_sym_addr = XEXP (DECL_RTL (decl), 0);
1507
1508 letter = TREE_PERMANENT (decl) ? 'S' : 'V';
1509
1510 if (!DECL_INITIAL (decl))
1511 current_sym_code = N_LCSYM;
1512 else if (TREE_READONLY (decl) && ! TREE_THIS_VOLATILE (decl))
1513 /* This is not quite right, but it's the closest
1514 of all the codes that Unix defines. */
1515 current_sym_code = DBX_STATIC_CONST_VAR_CODE;
1516 else
1517 {
1518 /* Ultrix `as' seems to need this. */
1519 #ifdef DBX_STATIC_STAB_DATA_SECTION
1520 data_section ();
1521 #endif
1522 current_sym_code = N_STSYM;
1523 }
1524 }
1525 }
1526 else if (regno >= 0)
1527 {
1528 letter = 'r';
1529 current_sym_code = N_RSYM;
1530 current_sym_value = DBX_REGISTER_NUMBER (regno);
1531 }
1532 else if (GET_CODE (DECL_RTL (decl)) == SUBREG)
1533 {
1534 rtx value = DECL_RTL (decl);
1535 int offset = 0;
1536 while (GET_CODE (value) == SUBREG)
1537 {
1538 offset += SUBREG_WORD (value);
1539 value = SUBREG_REG (value);
1540 }
1541 letter = 'r';
1542 current_sym_code = N_RSYM;
1543 current_sym_value = DBX_REGISTER_NUMBER (REGNO (value) + offset);
1544 }
1545 else if (GET_CODE (DECL_RTL (decl)) == MEM
1546 && (GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
1547 || (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG
1548 && REGNO (XEXP (DECL_RTL (decl), 0)) != FRAME_POINTER_REGNUM)))
1549 /* If the value is indirect by memory or by a register
1550 that isn't the frame pointer
1551 then it means the object is variable-sized and address through
1552 that register or stack slot. DBX has no way to represent this
1553 so all we can do is output the variable as a pointer.
1554 If it's not a parameter, ignore it.
1555 (VAR_DECLs like this can be made by integrate.c.) */
1556 {
1557 if (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG)
1558 {
1559 letter = 'r';
1560 current_sym_code = N_RSYM;
1561 current_sym_value = DBX_REGISTER_NUMBER (REGNO (XEXP (DECL_RTL (decl), 0)));
1562 }
1563 else
1564 {
1565 current_sym_code = N_LSYM;
1566 /* DECL_RTL looks like (MEM (MEM (PLUS (REG...) (CONST_INT...)))).
1567 We want the value of that CONST_INT. */
1568 current_sym_value
1569 = DEBUGGER_AUTO_OFFSET (XEXP (XEXP (DECL_RTL (decl), 0), 0));
1570 }
1571
1572 /* Effectively do build_pointer_type, but don't cache this type,
1573 since it might be temporary whereas the type it points to
1574 might have been saved for inlining. */
1575 /* Don't use REFERENCE_TYPE because dbx can't handle that. */
1576 type = make_node (POINTER_TYPE);
1577 TREE_TYPE (type) = TREE_TYPE (decl);
1578 }
1579 else if (GET_CODE (DECL_RTL (decl)) == MEM
1580 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG)
1581 {
1582 current_sym_code = N_LSYM;
1583 current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (DECL_RTL (decl), 0));
1584 }
1585 else if (GET_CODE (DECL_RTL (decl)) == MEM
1586 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == PLUS
1587 && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 1)) == CONST_INT)
1588 {
1589 current_sym_code = N_LSYM;
1590 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...)))
1591 We want the value of that CONST_INT. */
1592 current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (DECL_RTL (decl), 0));
1593 }
1594 else if (GET_CODE (DECL_RTL (decl)) == MEM
1595 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == CONST)
1596 {
1597 /* Handle an obscure case which can arise when optimizing and
1598 when there are few available registers. (This is *always*
1599 the case for i386/i486 targets). The DECL_RTL looks like
1600 (MEM (CONST ...)) even though this variable is a local `auto'
1601 or a local `register' variable. In effect, what has happened
1602 is that the reload pass has seen that all assignments and
1603 references for one such a local variable can be replaced by
1604 equivalent assignments and references to some static storage
1605 variable, thereby avoiding the need for a register. In such
1606 cases we're forced to lie to debuggers and tell them that
1607 this variable was itself `static'. */
1608 current_sym_code = N_LCSYM;
1609 letter = 'V';
1610 current_sym_addr = XEXP (XEXP (DECL_RTL (decl), 0), 0);
1611 }
1612 else
1613 /* Address might be a MEM, when DECL is a variable-sized object.
1614 Or it might be const0_rtx, meaning previous passes
1615 want us to ignore this variable. */
1616 break;
1617
1618 /* Ok, start a symtab entry and output the variable name. */
1619 FORCE_TEXT;
1620
1621 #ifdef DBX_STATIC_BLOCK_START
1622 DBX_STATIC_BLOCK_START (asmfile, current_sym_code);
1623 #endif
1624
1625 /* One slight hitch: if this is a VAR_DECL which is a static
1626 class member, we must put out the mangled name instead of the
1627 DECL_NAME. */
1628 {
1629 char *name;
1630 /* Note also that static member (variable) names DO NOT begin
1631 with underscores in .stabs directives. */
1632 if (DECL_LANG_SPECIFIC (decl))
1633 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1634 else
1635 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1636 fprintf (asmfile, "%s \"%s:", ASM_STABS_OP, name);
1637 }
1638 if (letter) putc (letter, asmfile);
1639 dbxout_type (type, 0, 0);
1640 dbxout_finish_symbol (decl);
1641
1642 #ifdef DBX_STATIC_BLOCK_END
1643 DBX_STATIC_BLOCK_END (asmfile, current_sym_code);
1644 #endif
1645 break;
1646 }
1647 }
1648
1649 static void
1650 dbxout_prepare_symbol (decl)
1651 tree decl;
1652 {
1653 #ifdef WINNING_GDB
1654 char *filename = DECL_SOURCE_FILE (decl);
1655
1656 dbxout_source_file (asmfile, filename);
1657 #endif
1658 }
1659
1660 static void
1661 dbxout_finish_symbol (sym)
1662 tree sym;
1663 {
1664 #ifdef DBX_FINISH_SYMBOL
1665 DBX_FINISH_SYMBOL (sym);
1666 #else
1667 int line = 0;
1668 #ifdef WINNING_GDB
1669 if (sym != 0)
1670 line = DECL_SOURCE_LINE (sym);
1671 #endif
1672
1673 fprintf (asmfile, "\",%d,0,%d,", current_sym_code, line);
1674 if (current_sym_addr)
1675 output_addr_const (asmfile, current_sym_addr);
1676 else
1677 fprintf (asmfile, "%d", current_sym_value);
1678 putc ('\n', asmfile);
1679 #endif
1680 }
1681
1682 /* Output definitions of all the decls in a chain. */
1683
1684 void
1685 dbxout_syms (syms)
1686 tree syms;
1687 {
1688 while (syms)
1689 {
1690 dbxout_symbol (syms, 1);
1691 syms = TREE_CHAIN (syms);
1692 }
1693 }
1694 \f
1695 /* The following two functions output definitions of function parameters.
1696 Each parameter gets a definition locating it in the parameter list.
1697 Each parameter that is a register variable gets a second definition
1698 locating it in the register.
1699
1700 Printing or argument lists in gdb uses the definitions that
1701 locate in the parameter list. But reference to the variable in
1702 expressions uses preferentially the definition as a register. */
1703
1704 /* Output definitions, referring to storage in the parmlist,
1705 of all the parms in PARMS, which is a chain of PARM_DECL nodes. */
1706
1707 void
1708 dbxout_parms (parms)
1709 tree parms;
1710 {
1711 for (; parms; parms = TREE_CHAIN (parms))
1712 if (DECL_NAME (parms) && TREE_TYPE (parms) != error_mark_node)
1713 {
1714 dbxout_prepare_symbol (parms);
1715
1716 /* Perform any necessary register eliminations on the parameter's rtl,
1717 so that the debugging output will be accurate. */
1718 DECL_INCOMING_RTL (parms)
1719 = eliminate_regs (DECL_INCOMING_RTL (parms), 0, 0);
1720 DECL_RTL (parms) = eliminate_regs (DECL_RTL (parms), 0, 0);
1721 #ifdef LEAF_REG_REMAP
1722 if (leaf_function)
1723 {
1724 leaf_renumber_regs_insn (DECL_INCOMING_RTL (parms));
1725 leaf_renumber_regs_insn (DECL_RTL (parms));
1726 }
1727 #endif
1728
1729 if (PARM_PASSED_IN_MEMORY (parms))
1730 {
1731 rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0);
1732
1733 /* ??? Here we assume that the parm address is indexed
1734 off the frame pointer or arg pointer.
1735 If that is not true, we produce meaningless results,
1736 but do not crash. */
1737 if (GET_CODE (addr) == PLUS
1738 && GET_CODE (XEXP (addr, 1)) == CONST_INT)
1739 current_sym_value = INTVAL (XEXP (addr, 1));
1740 else
1741 current_sym_value = 0;
1742
1743 current_sym_code = N_PSYM;
1744 current_sym_addr = 0;
1745
1746 FORCE_TEXT;
1747 if (DECL_NAME (parms))
1748 {
1749 current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
1750
1751 fprintf (asmfile, "%s \"%s:p", ASM_STABS_OP,
1752 IDENTIFIER_POINTER (DECL_NAME (parms)));
1753 }
1754 else
1755 {
1756 current_sym_nchars = 8;
1757 fprintf (asmfile, "%s \"(anon):p", ASM_STABS_OP);
1758 }
1759
1760 if (GET_CODE (DECL_RTL (parms)) == REG
1761 && REGNO (DECL_RTL (parms)) >= 0
1762 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
1763 dbxout_type (DECL_ARG_TYPE (parms), 0, 0);
1764 else
1765 {
1766 int original_value = current_sym_value;
1767
1768 /* This is the case where the parm is passed as an int or double
1769 and it is converted to a char, short or float and stored back
1770 in the parmlist. In this case, describe the parm
1771 with the variable's declared type, and adjust the address
1772 if the least significant bytes (which we are using) are not
1773 the first ones. */
1774 #if BYTES_BIG_ENDIAN
1775 if (TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
1776 current_sym_value += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
1777 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
1778 #endif
1779
1780 if (GET_CODE (DECL_RTL (parms)) == MEM
1781 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
1782 && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
1783 && INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == current_sym_value)
1784 dbxout_type (TREE_TYPE (parms), 0, 0);
1785 else
1786 {
1787 current_sym_value = original_value;
1788 dbxout_type (DECL_ARG_TYPE (parms), 0, 0);
1789 }
1790 }
1791 current_sym_value = DEBUGGER_ARG_OFFSET (current_sym_value, addr);
1792 dbxout_finish_symbol (parms);
1793 }
1794 else if (GET_CODE (DECL_RTL (parms)) == REG)
1795 {
1796 rtx best_rtl;
1797 char regparm_letter;
1798 /* Parm passed in registers and lives in registers or nowhere. */
1799
1800 current_sym_code = DBX_REGPARM_STABS_CODE;
1801 regparm_letter = DBX_REGPARM_STABS_LETTER;
1802 current_sym_addr = 0;
1803
1804 /* If parm lives in a register, use that register;
1805 pretend the parm was passed there. It would be more consistent
1806 to describe the register where the parm was passed,
1807 but in practice that register usually holds something else. */
1808 if (REGNO (DECL_RTL (parms)) >= 0
1809 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
1810 best_rtl = DECL_RTL (parms);
1811 /* If the parm lives nowhere,
1812 use the register where it was passed. */
1813 else
1814 best_rtl = DECL_INCOMING_RTL (parms);
1815 current_sym_value = DBX_REGISTER_NUMBER (REGNO (best_rtl));
1816
1817 FORCE_TEXT;
1818 if (DECL_NAME (parms))
1819 {
1820 current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
1821 fprintf (asmfile, "%s \"%s:%c", ASM_STABS_OP,
1822 IDENTIFIER_POINTER (DECL_NAME (parms)),
1823 regparm_letter);
1824 }
1825 else
1826 {
1827 current_sym_nchars = 8;
1828 fprintf (asmfile, "%s \"(anon):%c", ASM_STABS_OP,
1829 regparm_letter);
1830 }
1831
1832 dbxout_type (DECL_ARG_TYPE (parms), 0, 0);
1833 dbxout_finish_symbol (parms);
1834 }
1835 else if (GET_CODE (DECL_RTL (parms)) == MEM
1836 && XEXP (DECL_RTL (parms), 0) != const0_rtx)
1837 {
1838 /* Parm was passed in registers but lives on the stack. */
1839
1840 current_sym_code = N_PSYM;
1841 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))),
1842 in which case we want the value of that CONST_INT,
1843 or (MEM (REG ...)) or (MEM (MEM ...)),
1844 in which case we use a value of zero. */
1845 if (GET_CODE (XEXP (DECL_RTL (parms), 0)) == REG
1846 || GET_CODE (XEXP (DECL_RTL (parms), 0)) == MEM)
1847 current_sym_value = 0;
1848 else
1849 current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
1850 current_sym_addr = 0;
1851
1852 FORCE_TEXT;
1853 if (DECL_NAME (parms))
1854 {
1855 current_sym_nchars = 2 + strlen (IDENTIFIER_POINTER (DECL_NAME (parms)));
1856
1857 fprintf (asmfile, "%s \"%s:p", ASM_STABS_OP,
1858 IDENTIFIER_POINTER (DECL_NAME (parms)));
1859 }
1860 else
1861 {
1862 current_sym_nchars = 8;
1863 fprintf (asmfile, "%s \"(anon):p", ASM_STABS_OP);
1864 }
1865
1866 current_sym_value
1867 = DEBUGGER_ARG_OFFSET (current_sym_value,
1868 XEXP (DECL_RTL (parms), 0));
1869 dbxout_type (TREE_TYPE (parms), 0, 0);
1870 dbxout_finish_symbol (parms);
1871 }
1872 }
1873 }
1874
1875 /* Output definitions for the places where parms live during the function,
1876 when different from where they were passed, when the parms were passed
1877 in memory.
1878
1879 It is not useful to do this for parms passed in registers
1880 that live during the function in different registers, because it is
1881 impossible to look in the passed register for the passed value,
1882 so we use the within-the-function register to begin with.
1883
1884 PARMS is a chain of PARM_DECL nodes. */
1885
1886 void
1887 dbxout_reg_parms (parms)
1888 tree parms;
1889 {
1890 for (; parms; parms = TREE_CHAIN (parms))
1891 if (DECL_NAME (parms))
1892 {
1893 dbxout_prepare_symbol (parms);
1894
1895 /* Report parms that live in registers during the function
1896 but were passed in memory. */
1897 if (GET_CODE (DECL_RTL (parms)) == REG
1898 && REGNO (DECL_RTL (parms)) >= 0
1899 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER
1900 && PARM_PASSED_IN_MEMORY (parms))
1901 {
1902 current_sym_code = N_RSYM;
1903 current_sym_value = DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms)));
1904 current_sym_addr = 0;
1905
1906 FORCE_TEXT;
1907 if (DECL_NAME (parms))
1908 {
1909 current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
1910 fprintf (asmfile, "%s \"%s:r", ASM_STABS_OP,
1911 IDENTIFIER_POINTER (DECL_NAME (parms)));
1912 }
1913 else
1914 {
1915 current_sym_nchars = 8;
1916 fprintf (asmfile, "%s \"(anon):r", ASM_STABS_OP);
1917 }
1918 dbxout_type (TREE_TYPE (parms), 0, 0);
1919 dbxout_finish_symbol (parms);
1920 }
1921 /* Report parms that live in memory but not where they were passed. */
1922 else if (GET_CODE (DECL_RTL (parms)) == MEM
1923 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
1924 && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
1925 && PARM_PASSED_IN_MEMORY (parms)
1926 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms)))
1927 {
1928 #if 0 /* ??? It is not clear yet what should replace this. */
1929 int offset = DECL_OFFSET (parms) / BITS_PER_UNIT;
1930 /* A parm declared char is really passed as an int,
1931 so it occupies the least significant bytes.
1932 On a big-endian machine those are not the low-numbered ones. */
1933 #if BYTES_BIG_ENDIAN
1934 if (offset != -1 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
1935 offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
1936 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
1937 #endif
1938 if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...}
1939 #endif
1940 current_sym_code = N_LSYM;
1941 current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (DECL_RTL (parms), 0));
1942 current_sym_addr = 0;
1943 FORCE_TEXT;
1944 if (DECL_NAME (parms))
1945 {
1946 current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
1947 fprintf (asmfile, "%s \"%s:", ASM_STABS_OP,
1948 IDENTIFIER_POINTER (DECL_NAME (parms)));
1949 }
1950 else
1951 {
1952 current_sym_nchars = 8;
1953 fprintf (asmfile, "%s \"(anon):", ASM_STABS_OP);
1954 }
1955 dbxout_type (TREE_TYPE (parms), 0, 0);
1956 dbxout_finish_symbol (parms);
1957 }
1958 }
1959 }
1960 \f
1961 /* Given a chain of ..._TYPE nodes (as come in a parameter list),
1962 output definitions of those names, in raw form */
1963
1964 void
1965 dbxout_args (args)
1966 tree args;
1967 {
1968 while (args)
1969 {
1970 putc (',', asmfile);
1971 dbxout_type (TREE_VALUE (args), 0, 0);
1972 CHARS (1);
1973 args = TREE_CHAIN (args);
1974 }
1975 }
1976 \f
1977 /* Given a chain of ..._TYPE nodes,
1978 find those which have typedef names and output those names.
1979 This is to ensure those types get output. */
1980
1981 void
1982 dbxout_types (types)
1983 register tree types;
1984 {
1985 while (types)
1986 {
1987 if (TYPE_NAME (types)
1988 && TREE_CODE (TYPE_NAME (types)) == TYPE_DECL
1989 && ! TREE_ASM_WRITTEN (TYPE_NAME (types)))
1990 dbxout_symbol (TYPE_NAME (types), 1);
1991 types = TREE_CHAIN (types);
1992 }
1993 }
1994 \f
1995 /* Output everything about a symbol block (a BLOCK node
1996 that represents a scope level),
1997 including recursive output of contained blocks.
1998
1999 BLOCK is the BLOCK node.
2000 DEPTH is its depth within containing symbol blocks.
2001 ARGS is usually zero; but for the outermost block of the
2002 body of a function, it is a chain of PARM_DECLs for the function parameters.
2003 We output definitions of all the register parms
2004 as if they were local variables of that block.
2005
2006 If -g1 was used, we count blocks just the same, but output nothing
2007 except for the outermost block.
2008
2009 Actually, BLOCK may be several blocks chained together.
2010 We handle them all in sequence. */
2011
2012 static void
2013 dbxout_block (block, depth, args)
2014 register tree block;
2015 int depth;
2016 tree args;
2017 {
2018 int blocknum;
2019
2020 while (block)
2021 {
2022 /* Ignore blocks never expanded or otherwise marked as real. */
2023 if (TREE_USED (block))
2024 {
2025 #ifndef DBX_LBRAC_FIRST
2026 /* In dbx format, the syms of a block come before the N_LBRAC. */
2027 if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
2028 dbxout_syms (BLOCK_VARS (block));
2029 if (args)
2030 dbxout_reg_parms (args);
2031 #endif
2032
2033 /* Now output an N_LBRAC symbol to represent the beginning of
2034 the block. Use the block's tree-walk order to generate
2035 the assembler symbols LBBn and LBEn
2036 that final will define around the code in this block. */
2037 if (depth > 0 && debug_info_level != DINFO_LEVEL_TERSE)
2038 {
2039 char buf[20];
2040 blocknum = next_block_number++;
2041 ASM_GENERATE_INTERNAL_LABEL (buf, "LBB", blocknum);
2042
2043 if (BLOCK_HANDLER_BLOCK (block))
2044 {
2045 /* A catch block. Must precede N_LBRAC. */
2046 tree decl = BLOCK_VARS (block);
2047 while (decl)
2048 {
2049 #ifdef DBX_OUTPUT_CATCH
2050 DBX_OUTPUT_CATCH (asmfile, decl, buf);
2051 #else
2052 fprintf (asmfile, "%s \"%s:C1\",%d,0,0,", ASM_STABS_OP,
2053 IDENTIFIER_POINTER (DECL_NAME (decl)), N_CATCH);
2054 assemble_name (asmfile, buf);
2055 fprintf (asmfile, "\n");
2056 #endif
2057 decl = TREE_CHAIN (decl);
2058 }
2059 }
2060
2061 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC);
2062 assemble_name (asmfile, buf);
2063 fprintf (asmfile, "\n");
2064 }
2065 else if (depth > 0)
2066 /* Count blocks the same way regardless of debug_info_level. */
2067 next_block_number++;
2068
2069 #ifdef DBX_LBRAC_FIRST
2070 /* On some weird machines, the syms of a block
2071 come after the N_LBRAC. */
2072 if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
2073 dbxout_syms (BLOCK_VARS (block));
2074 if (args)
2075 dbxout_reg_parms (args);
2076 #endif
2077
2078 /* Output the subblocks. */
2079 dbxout_block (BLOCK_SUBBLOCKS (block), depth + 1, 0);
2080
2081 /* Refer to the marker for the end of the block. */
2082 if (depth > 0 && debug_info_level != DINFO_LEVEL_TERSE)
2083 {
2084 char buf[20];
2085 ASM_GENERATE_INTERNAL_LABEL (buf, "LBE", blocknum);
2086 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC);
2087 assemble_name (asmfile, buf);
2088 fprintf (asmfile, "\n");
2089 }
2090 }
2091 block = BLOCK_CHAIN (block);
2092 }
2093 }
2094
2095 /* Output the information about a function and its arguments and result.
2096 Usually this follows the function's code,
2097 but on some systems, it comes before. */
2098
2099 static void
2100 dbxout_really_begin_function (decl)
2101 tree decl;
2102 {
2103 dbxout_symbol (decl, 0);
2104 dbxout_parms (DECL_ARGUMENTS (decl));
2105 if (DECL_NAME (DECL_RESULT (decl)) != 0)
2106 dbxout_symbol (DECL_RESULT (decl), 1);
2107 }
2108
2109 /* Called at beginning of output of function definition. */
2110
2111 void
2112 dbxout_begin_function (decl)
2113 tree decl;
2114 {
2115 #ifdef DBX_FUNCTION_FIRST
2116 dbxout_really_begin_function (decl);
2117 #endif
2118 }
2119
2120 /* Output dbx data for a function definition.
2121 This includes a definition of the function name itself (a symbol),
2122 definitions of the parameters (locating them in the parameter list)
2123 and then output the block that makes up the function's body
2124 (including all the auto variables of the function). */
2125
2126 void
2127 dbxout_function (decl)
2128 tree decl;
2129 {
2130 #ifndef DBX_FUNCTION_FIRST
2131 dbxout_really_begin_function (decl);
2132 #endif
2133 dbxout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl));
2134 #ifdef DBX_OUTPUT_FUNCTION_END
2135 DBX_OUTPUT_FUNCTION_END (asmfile, decl);
2136 #endif
2137 }
2138 #endif /* DBX_DEBUGGING_INFO */
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