Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
6f2750fe | 2 | Copyright (C) 1999-2016 Free Software Foundation, Inc. |
fac0d250 RH |
3 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
ec2655a6 | 9 | the Free Software Foundation; either version 3, or (at your option) |
fac0d250 RH |
10 | any later version. |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
fac0d250 | 21 | |
89b66cde | 22 | /* Logical line numbers can be controlled by the compiler via the |
bd0eb99b | 23 | following directives: |
fac0d250 RH |
24 | |
25 | .file FILENO "file.c" | |
ecea7679 | 26 | .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \ |
92846e72 CC |
27 | [epilogue_begin] [is_stmt VALUE] [isa VALUE] \ |
28 | [discriminator VALUE] | |
bd0eb99b | 29 | */ |
fac0d250 | 30 | |
fac0d250 | 31 | #include "as.h" |
bd0eb99b | 32 | #include "safe-ctype.h" |
92eb7b32 | 33 | |
42dbf88c NC |
34 | #ifdef HAVE_LIMITS_H |
35 | #include <limits.h> | |
92625c16 | 36 | #else |
6717891c NC |
37 | #ifdef HAVE_SYS_PARAM_H |
38 | #include <sys/param.h> | |
39 | #endif | |
6256f9dd | 40 | #ifndef INT_MAX |
ee515fb7 | 41 | #define INT_MAX (int) (((unsigned) (-1)) >> 1) |
42dbf88c | 42 | #endif |
b8f080d6 | 43 | #endif |
42dbf88c | 44 | |
70658493 | 45 | #include "dwarf2dbg.h" |
a7ed1ca2 | 46 | #include <filenames.h> |
70658493 | 47 | |
56487c55 NC |
48 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
49 | /* We need to decide which character to use as a directory separator. | |
50 | Just because HAVE_DOS_BASED_FILE_SYSTEM is defined, it does not | |
51 | necessarily mean that the backslash character is the one to use. | |
52 | Some environments, eg Cygwin, can support both naming conventions. | |
53 | So we use the heuristic that we only need to use the backslash if | |
54 | the path is an absolute path starting with a DOS style drive | |
55 | selector. eg C: or D: */ | |
56 | # define INSERT_DIR_SEPARATOR(string, offset) \ | |
57 | do \ | |
58 | { \ | |
59 | if (offset > 1 \ | |
7fd3924a AM |
60 | && string[0] != 0 \ |
61 | && string[1] == ':') \ | |
56487c55 NC |
62 | string [offset] = '\\'; \ |
63 | else \ | |
64 | string [offset] = '/'; \ | |
65 | } \ | |
66 | while (0) | |
67 | #else | |
68 | # define INSERT_DIR_SEPARATOR(string, offset) string[offset] = '/' | |
69 | #endif | |
70 | ||
14e777e0 | 71 | #ifndef DWARF2_FORMAT |
413a266c | 72 | # define DWARF2_FORMAT(SEC) dwarf2_format_32bit |
14e777e0 KB |
73 | #endif |
74 | ||
9605f328 | 75 | #ifndef DWARF2_ADDR_SIZE |
e4475e39 | 76 | # define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
9605f328 AO |
77 | #endif |
78 | ||
01e1a5bc NC |
79 | #ifndef DWARF2_FILE_NAME |
80 | #define DWARF2_FILE_NAME(FILENAME, DIRNAME) FILENAME | |
81 | #endif | |
82 | ||
83 | #ifndef DWARF2_FILE_TIME_NAME | |
84 | #define DWARF2_FILE_TIME_NAME(FILENAME,DIRNAME) 0 | |
85 | #endif | |
86 | ||
87 | #ifndef DWARF2_FILE_SIZE_NAME | |
88 | #define DWARF2_FILE_SIZE_NAME(FILENAME,DIRNAME) 0 | |
89 | #endif | |
90 | ||
fc0eebac TG |
91 | #ifndef DWARF2_VERSION |
92 | #define DWARF2_VERSION 2 | |
93 | #endif | |
94 | ||
88ebb0a1 MW |
95 | /* The .debug_aranges version has been 2 in DWARF version 2, 3 and 4. */ |
96 | #ifndef DWARF2_ARANGES_VERSION | |
97 | #define DWARF2_ARANGES_VERSION 2 | |
98 | #endif | |
99 | ||
100 | /* This implementation output version 2 .debug_line information. */ | |
101 | #ifndef DWARF2_LINE_VERSION | |
102 | #define DWARF2_LINE_VERSION 2 | |
103 | #endif | |
104 | ||
fac0d250 RH |
105 | #include "subsegs.h" |
106 | ||
fa8f86ff | 107 | #include "dwarf2.h" |
fac0d250 | 108 | |
fac0d250 RH |
109 | /* Since we can't generate the prolog until the body is complete, we |
110 | use three different subsegments for .debug_line: one holding the | |
111 | prolog, one for the directory and filename info, and one for the | |
112 | body ("statement program"). */ | |
113 | #define DL_PROLOG 0 | |
114 | #define DL_FILES 1 | |
115 | #define DL_BODY 2 | |
116 | ||
1737851b BW |
117 | /* If linker relaxation might change offsets in the code, the DWARF special |
118 | opcodes and variable-length operands cannot be used. If this macro is | |
119 | nonzero, use the DW_LNS_fixed_advance_pc opcode instead. */ | |
120 | #ifndef DWARF2_USE_FIXED_ADVANCE_PC | |
453dc3f0 | 121 | # define DWARF2_USE_FIXED_ADVANCE_PC linkrelax |
1737851b BW |
122 | #endif |
123 | ||
fac0d250 RH |
124 | /* First special line opcde - leave room for the standard opcodes. |
125 | Note: If you want to change this, you'll have to update the | |
126 | "standard_opcode_lengths" table that is emitted below in | |
bd0eb99b RH |
127 | out_debug_line(). */ |
128 | #define DWARF2_LINE_OPCODE_BASE 13 | |
fac0d250 RH |
129 | |
130 | #ifndef DWARF2_LINE_BASE | |
131 | /* Minimum line offset in a special line info. opcode. This value | |
132 | was chosen to give a reasonable range of values. */ | |
133 | # define DWARF2_LINE_BASE -5 | |
134 | #endif | |
135 | ||
136 | /* Range of line offsets in a special line info. opcode. */ | |
137 | #ifndef DWARF2_LINE_RANGE | |
138 | # define DWARF2_LINE_RANGE 14 | |
139 | #endif | |
140 | ||
141 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH | |
142 | /* Define the architecture-dependent minimum instruction length (in | |
143 | bytes). This value should be rather too small than too big. */ | |
4dc7ead9 | 144 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
fac0d250 RH |
145 | #endif |
146 | ||
bd0eb99b | 147 | /* Flag that indicates the initial value of the is_stmt_start flag. */ |
fac0d250 RH |
148 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 |
149 | ||
cb30237e | 150 | /* Given a special op, return the line skip amount. */ |
fac0d250 RH |
151 | #define SPECIAL_LINE(op) \ |
152 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) | |
153 | ||
154 | /* Given a special op, return the address skip amount (in units of | |
155 | DWARF2_LINE_MIN_INSN_LENGTH. */ | |
156 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) | |
157 | ||
cb30237e | 158 | /* The maximum address skip amount that can be encoded with a special op. */ |
fac0d250 RH |
159 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
160 | ||
62ebcb5c AM |
161 | #ifndef TC_PARSE_CONS_RETURN_NONE |
162 | #define TC_PARSE_CONS_RETURN_NONE BFD_RELOC_NONE | |
163 | #endif | |
164 | ||
ee515fb7 | 165 | struct line_entry { |
220e750f | 166 | struct line_entry *next; |
07a53e5c | 167 | symbolS *label; |
220e750f | 168 | struct dwarf2_line_info loc; |
e6c774b4 | 169 | }; |
fac0d250 | 170 | |
ee515fb7 | 171 | struct line_subseg { |
220e750f RH |
172 | struct line_subseg *next; |
173 | subsegT subseg; | |
174 | struct line_entry *head; | |
175 | struct line_entry **ptail; | |
e410add4 | 176 | struct line_entry **pmove_tail; |
220e750f | 177 | }; |
353e2c69 | 178 | |
ee515fb7 | 179 | struct line_seg { |
220e750f RH |
180 | struct line_seg *next; |
181 | segT seg; | |
182 | struct line_subseg *head; | |
183 | symbolS *text_start; | |
184 | symbolS *text_end; | |
185 | }; | |
186 | ||
187 | /* Collects data for all line table entries during assembly. */ | |
188 | static struct line_seg *all_segs; | |
1e9cc1c2 | 189 | static struct line_seg **last_seg_ptr; |
220e750f | 190 | |
ee515fb7 | 191 | struct file_entry { |
a7ed1ca2 | 192 | const char *filename; |
220e750f RH |
193 | unsigned int dir; |
194 | }; | |
195 | ||
196 | /* Table of files used by .debug_line. */ | |
197 | static struct file_entry *files; | |
198 | static unsigned int files_in_use; | |
199 | static unsigned int files_allocated; | |
200 | ||
a7ed1ca2 NC |
201 | /* Table of directories used by .debug_line. */ |
202 | static char **dirs; | |
203 | static unsigned int dirs_in_use; | |
204 | static unsigned int dirs_allocated; | |
205 | ||
b34976b6 | 206 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
220e750f | 207 | doing work when there's nothing to do. */ |
1eee4adc | 208 | bfd_boolean dwarf2_loc_directive_seen; |
220e750f | 209 | |
07a53e5c RH |
210 | /* TRUE when we're supposed to set the basic block mark whenever a |
211 | label is seen. */ | |
212 | bfd_boolean dwarf2_loc_mark_labels; | |
213 | ||
220e750f | 214 | /* Current location as indicated by the most recent .loc directive. */ |
bd0eb99b RH |
215 | static struct dwarf2_line_info current = { |
216 | 1, 1, 0, 0, | |
92846e72 CC |
217 | DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, |
218 | 0 | |
bd0eb99b | 219 | }; |
220e750f | 220 | |
220e750f RH |
221 | /* The size of an address on the target. */ |
222 | static unsigned int sizeof_address; | |
223 | \f | |
a2e22468 | 224 | static unsigned int get_filenum (const char *, unsigned int); |
413a266c | 225 | |
c5c0a210 | 226 | #ifndef TC_DWARF2_EMIT_OFFSET |
802f5d9e | 227 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
c5c0a210 | 228 | |
6174d9c8 RH |
229 | /* Create an offset to .dwarf2_*. */ |
230 | ||
231 | static void | |
a2e22468 | 232 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
6174d9c8 | 233 | { |
91d6fa6a | 234 | expressionS exp; |
6174d9c8 | 235 | |
91d6fa6a NC |
236 | exp.X_op = O_symbol; |
237 | exp.X_add_symbol = symbol; | |
238 | exp.X_add_number = 0; | |
239 | emit_expr (&exp, size); | |
6174d9c8 | 240 | } |
c5c0a210 | 241 | #endif |
6174d9c8 | 242 | |
e410add4 | 243 | /* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */ |
220e750f RH |
244 | |
245 | static struct line_subseg * | |
e410add4 | 246 | get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p) |
220e750f | 247 | { |
5f3fd8b4 | 248 | struct line_seg *s = seg_info (seg)->dwarf2_line_seg; |
91d6fa6a | 249 | struct line_subseg **pss, *lss; |
fac0d250 | 250 | |
1e9cc1c2 NC |
251 | if (s == NULL) |
252 | { | |
e410add4 RS |
253 | if (!create_p) |
254 | return NULL; | |
255 | ||
325801bd | 256 | s = XNEW (struct line_seg); |
1e9cc1c2 NC |
257 | s->next = NULL; |
258 | s->seg = seg; | |
259 | s->head = NULL; | |
260 | *last_seg_ptr = s; | |
261 | last_seg_ptr = &s->next; | |
5f3fd8b4 | 262 | seg_info (seg)->dwarf2_line_seg = s; |
1e9cc1c2 NC |
263 | } |
264 | gas_assert (seg == s->seg); | |
220e750f | 265 | |
91d6fa6a | 266 | for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) |
fac0d250 | 267 | { |
91d6fa6a | 268 | if (lss->subseg == subseg) |
ee515fb7 | 269 | goto found_subseg; |
91d6fa6a | 270 | if (lss->subseg > subseg) |
220e750f | 271 | break; |
fac0d250 | 272 | } |
220e750f | 273 | |
325801bd | 274 | lss = XNEW (struct line_subseg); |
91d6fa6a NC |
275 | lss->next = *pss; |
276 | lss->subseg = subseg; | |
277 | lss->head = NULL; | |
278 | lss->ptail = &lss->head; | |
e410add4 | 279 | lss->pmove_tail = &lss->head; |
91d6fa6a | 280 | *pss = lss; |
220e750f RH |
281 | |
282 | found_subseg: | |
91d6fa6a | 283 | return lss; |
fac0d250 RH |
284 | } |
285 | ||
6a50d470 | 286 | /* Record an entry for LOC occurring at LABEL. */ |
07a53e5c RH |
287 | |
288 | static void | |
6a50d470 | 289 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
07a53e5c | 290 | { |
6a50d470 | 291 | struct line_subseg *lss; |
07a53e5c RH |
292 | struct line_entry *e; |
293 | ||
325801bd | 294 | e = XNEW (struct line_entry); |
07a53e5c | 295 | e->next = NULL; |
6a50d470 | 296 | e->label = label; |
07a53e5c RH |
297 | e->loc = *loc; |
298 | ||
e410add4 | 299 | lss = get_line_subseg (now_seg, now_subseg, TRUE); |
6a50d470 RS |
300 | *lss->ptail = e; |
301 | lss->ptail = &e->next; | |
07a53e5c RH |
302 | } |
303 | ||
436d9e46 | 304 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
353e2c69 | 305 | |
220e750f | 306 | void |
a2e22468 | 307 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
fac0d250 | 308 | { |
1ea5c325 MS |
309 | static unsigned int line = -1; |
310 | static unsigned int filenum = -1; | |
220e750f | 311 | |
6a50d470 RS |
312 | symbolS *sym; |
313 | ||
220e750f RH |
314 | /* Early out for as-yet incomplete location information. */ |
315 | if (loc->filenum == 0 || loc->line == 0) | |
316 | return; | |
317 | ||
ffa554ed GK |
318 | /* Don't emit sequences of line symbols for the same line when the |
319 | symbols apply to assembler code. It is necessary to emit | |
320 | duplicate line symbols when a compiler asks for them, because GDB | |
321 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 322 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 323 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
324 | return; |
325 | ||
326 | line = loc->line; | |
327 | filenum = loc->filenum; | |
328 | ||
453dc3f0 NC |
329 | if (linkrelax) |
330 | { | |
331 | char name[120]; | |
332 | ||
333 | /* Use a non-fake name for the line number location, | |
334 | so that it can be referred to by relocations. */ | |
335 | sprintf (name, ".Loc.%u.%u", line, filenum); | |
6a50d470 | 336 | sym = symbol_new (name, now_seg, ofs, frag_now); |
453dc3f0 NC |
337 | } |
338 | else | |
6a50d470 RS |
339 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
340 | dwarf2_gen_line_info_1 (sym, loc); | |
220e750f | 341 | } |
fac0d250 | 342 | |
ecea7679 RH |
343 | /* Returns the current source information. If .file directives have |
344 | been encountered, the info for the corresponding source file is | |
345 | returned. Otherwise, the info for the assembly source file is | |
346 | returned. */ | |
347 | ||
220e750f | 348 | void |
a2e22468 | 349 | dwarf2_where (struct dwarf2_line_info *line) |
220e750f RH |
350 | { |
351 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 352 | { |
3b4dbbbf | 353 | const char *filename = as_where (&line->line); |
a7ed1ca2 | 354 | line->filenum = get_filenum (filename, 0); |
220e750f | 355 | line->column = 0; |
bd0eb99b | 356 | line->flags = DWARF2_FLAG_IS_STMT; |
ecea7679 | 357 | line->isa = current.isa; |
92846e72 | 358 | line->discriminator = current.discriminator; |
fac0d250 | 359 | } |
220e750f RH |
360 | else |
361 | *line = current; | |
fac0d250 RH |
362 | } |
363 | ||
7fd3924a | 364 | /* A hook to allow the target backend to inform the line number state |
ecea7679 RH |
365 | machine of isa changes when assembler debug info is enabled. */ |
366 | ||
367 | void | |
368 | dwarf2_set_isa (unsigned int isa) | |
369 | { | |
370 | current.isa = isa; | |
371 | } | |
372 | ||
220e750f RH |
373 | /* Called for each machine instruction, or relatively atomic group of |
374 | machine instructions (ie built-in macro). The instruction or group | |
375 | is SIZE bytes in length. If dwarf2 line number generation is called | |
376 | for, emit a line statement appropriately. */ | |
353e2c69 | 377 | |
220e750f | 378 | void |
a2e22468 | 379 | dwarf2_emit_insn (int size) |
fac0d250 | 380 | { |
220e750f | 381 | struct dwarf2_line_info loc; |
fac0d250 | 382 | |
7fd3924a | 383 | if (!dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2) |
220e750f | 384 | return; |
7fd3924a AM |
385 | |
386 | dwarf2_where (&loc); | |
b6675117 | 387 | |
220e750f | 388 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
661ba50f BW |
389 | dwarf2_consume_line_info (); |
390 | } | |
391 | ||
e410add4 RS |
392 | /* Move all previously-emitted line entries for the current position by |
393 | DELTA bytes. This function cannot be used to move the same entries | |
394 | twice. */ | |
395 | ||
396 | void | |
397 | dwarf2_move_insn (int delta) | |
398 | { | |
399 | struct line_subseg *lss; | |
400 | struct line_entry *e; | |
401 | valueT now; | |
402 | ||
403 | if (delta == 0) | |
404 | return; | |
405 | ||
406 | lss = get_line_subseg (now_seg, now_subseg, FALSE); | |
407 | if (!lss) | |
408 | return; | |
409 | ||
410 | now = frag_now_fix (); | |
411 | while ((e = *lss->pmove_tail)) | |
412 | { | |
413 | if (S_GET_VALUE (e->label) == now) | |
414 | S_SET_VALUE (e->label, now + delta); | |
415 | lss->pmove_tail = &e->next; | |
416 | } | |
417 | } | |
418 | ||
661ba50f BW |
419 | /* Called after the current line information has been either used with |
420 | dwarf2_gen_line_info or saved with a machine instruction for later use. | |
421 | This resets the state of the line number information to reflect that | |
422 | it has been used. */ | |
423 | ||
424 | void | |
425 | dwarf2_consume_line_info (void) | |
426 | { | |
427 | /* Unless we generate DWARF2 debugging information for each | |
428 | assembler line, we only emit one line symbol for one LOC. */ | |
7fd3924a | 429 | dwarf2_loc_directive_seen = FALSE; |
bd0eb99b RH |
430 | |
431 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK | |
432 | | DWARF2_FLAG_PROLOGUE_END | |
433 | | DWARF2_FLAG_EPILOGUE_BEGIN); | |
92846e72 | 434 | current.discriminator = 0; |
220e750f | 435 | } |
fac0d250 | 436 | |
07a53e5c RH |
437 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
438 | is enabled, emit a basic block marker. */ | |
439 | ||
440 | void | |
441 | dwarf2_emit_label (symbolS *label) | |
442 | { | |
443 | struct dwarf2_line_info loc; | |
444 | ||
445 | if (!dwarf2_loc_mark_labels) | |
446 | return; | |
447 | if (S_GET_SEGMENT (label) != now_seg) | |
448 | return; | |
449 | if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) | |
450 | return; | |
7fd3924a AM |
451 | if (files_in_use == 0 && debug_type != DEBUG_DWARF2) |
452 | return; | |
453 | ||
454 | dwarf2_where (&loc); | |
07a53e5c RH |
455 | |
456 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
457 | ||
6a50d470 | 458 | dwarf2_gen_line_info_1 (label, &loc); |
7fd3924a | 459 | dwarf2_consume_line_info (); |
07a53e5c RH |
460 | } |
461 | ||
a7ed1ca2 NC |
462 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
463 | allocate it on that file table slot, otherwise return the first | |
464 | empty one. */ | |
220e750f RH |
465 | |
466 | static unsigned int | |
a2e22468 | 467 | get_filenum (const char *filename, unsigned int num) |
220e750f | 468 | { |
a7ed1ca2 NC |
469 | static unsigned int last_used, last_used_dir_len; |
470 | const char *file; | |
471 | size_t dir_len; | |
472 | unsigned int i, dir; | |
220e750f | 473 | |
a7ed1ca2 NC |
474 | if (num == 0 && last_used) |
475 | { | |
476 | if (! files[last_used].dir | |
8b6efd89 | 477 | && filename_cmp (filename, files[last_used].filename) == 0) |
a7ed1ca2 NC |
478 | return last_used; |
479 | if (files[last_used].dir | |
8b6efd89 KT |
480 | && filename_ncmp (filename, dirs[files[last_used].dir], |
481 | last_used_dir_len) == 0 | |
a7ed1ca2 | 482 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) |
8b6efd89 KT |
483 | && filename_cmp (filename + last_used_dir_len + 1, |
484 | files[last_used].filename) == 0) | |
a7ed1ca2 NC |
485 | return last_used; |
486 | } | |
220e750f | 487 | |
a7ed1ca2 NC |
488 | file = lbasename (filename); |
489 | /* Don't make empty string from / or A: from A:/ . */ | |
490 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
491 | if (file <= filename + 3) | |
492 | file = filename; | |
493 | #else | |
494 | if (file == filename + 1) | |
495 | file = filename; | |
496 | #endif | |
497 | dir_len = file - filename; | |
498 | ||
499 | dir = 0; | |
500 | if (dir_len) | |
501 | { | |
01e1a5bc | 502 | #ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR |
a7ed1ca2 | 503 | --dir_len; |
01e1a5bc | 504 | #endif |
a7ed1ca2 | 505 | for (dir = 1; dir < dirs_in_use; ++dir) |
8b6efd89 | 506 | if (filename_ncmp (filename, dirs[dir], dir_len) == 0 |
a7ed1ca2 NC |
507 | && dirs[dir][dir_len] == '\0') |
508 | break; | |
509 | ||
510 | if (dir >= dirs_in_use) | |
511 | { | |
512 | if (dir >= dirs_allocated) | |
513 | { | |
514 | dirs_allocated = dir + 32; | |
325801bd | 515 | dirs = XRESIZEVEC (char *, dirs, dirs_allocated); |
a7ed1ca2 NC |
516 | } |
517 | ||
1e9cc1c2 | 518 | dirs[dir] = (char *) xmalloc (dir_len + 1); |
a7ed1ca2 NC |
519 | memcpy (dirs[dir], filename, dir_len); |
520 | dirs[dir][dir_len] = '\0'; | |
521 | dirs_in_use = dir + 1; | |
522 | } | |
523 | } | |
524 | ||
525 | if (num == 0) | |
526 | { | |
527 | for (i = 1; i < files_in_use; ++i) | |
528 | if (files[i].dir == dir | |
88b4ca40 | 529 | && files[i].filename |
8b6efd89 | 530 | && filename_cmp (file, files[i].filename) == 0) |
a7ed1ca2 NC |
531 | { |
532 | last_used = i; | |
533 | last_used_dir_len = dir_len; | |
534 | return i; | |
535 | } | |
536 | } | |
537 | else | |
538 | i = num; | |
220e750f RH |
539 | |
540 | if (i >= files_allocated) | |
fac0d250 | 541 | { |
249e3833 RH |
542 | unsigned int old = files_allocated; |
543 | ||
220e750f | 544 | files_allocated = i + 32; |
325801bd | 545 | files = XRESIZEVEC (struct file_entry, files, files_allocated); |
249e3833 RH |
546 | |
547 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
548 | } |
549 | ||
a7ed1ca2 NC |
550 | files[i].filename = num ? file : xstrdup (file); |
551 | files[i].dir = dir; | |
10cd14b4 AM |
552 | if (files_in_use < i + 1) |
553 | files_in_use = i + 1; | |
220e750f | 554 | last_used = i; |
a7ed1ca2 | 555 | last_used_dir_len = dir_len; |
220e750f RH |
556 | |
557 | return i; | |
558 | } | |
fac0d250 | 559 | |
ecb4347a DJ |
560 | /* Handle two forms of .file directive: |
561 | - Pass .file "source.c" to s_app_file | |
562 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 563 | |
ecb4347a DJ |
564 | If an entry is added to the file table, return a pointer to the filename. */ |
565 | ||
566 | char * | |
a2e22468 | 567 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) |
220e750f RH |
568 | { |
569 | offsetT num; | |
e46d99eb | 570 | char *filename; |
220e750f RH |
571 | int filename_len; |
572 | ||
573 | /* Continue to accept a bare string and pass it off. */ | |
574 | SKIP_WHITESPACE (); | |
575 | if (*input_line_pointer == '"') | |
fac0d250 | 576 | { |
220e750f | 577 | s_app_file (0); |
ecb4347a | 578 | return NULL; |
fac0d250 RH |
579 | } |
580 | ||
220e750f RH |
581 | num = get_absolute_expression (); |
582 | filename = demand_copy_C_string (&filename_len); | |
bd0eb99b RH |
583 | if (filename == NULL) |
584 | return NULL; | |
220e750f RH |
585 | demand_empty_rest_of_line (); |
586 | ||
249e3833 | 587 | if (num < 1) |
fac0d250 | 588 | { |
0e389e77 | 589 | as_bad (_("file number less than one")); |
ecb4347a | 590 | return NULL; |
fac0d250 RH |
591 | } |
592 | ||
7cadeb2c AM |
593 | /* A .file directive implies compiler generated debug information is |
594 | being supplied. Turn off gas generated debug info. */ | |
595 | debug_type = DEBUG_NONE; | |
596 | ||
0e1a166b | 597 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 598 | { |
0e389e77 | 599 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 600 | return NULL; |
249e3833 | 601 | } |
220e750f | 602 | |
a7ed1ca2 | 603 | get_filenum (filename, num); |
ecb4347a DJ |
604 | |
605 | return filename; | |
fac0d250 RH |
606 | } |
607 | ||
220e750f | 608 | void |
a2e22468 | 609 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
220e750f | 610 | { |
ecea7679 RH |
611 | offsetT filenum, line; |
612 | ||
851feff8 DJ |
613 | /* If we see two .loc directives in a row, force the first one to be |
614 | output now. */ | |
7cadeb2c | 615 | if (dwarf2_loc_directive_seen) |
6a50d470 | 616 | dwarf2_emit_insn (0); |
851feff8 | 617 | |
ecea7679 RH |
618 | filenum = get_absolute_expression (); |
619 | SKIP_WHITESPACE (); | |
620 | line = get_absolute_expression (); | |
621 | ||
622 | if (filenum < 1) | |
623 | { | |
624 | as_bad (_("file number less than one")); | |
625 | return; | |
626 | } | |
627 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) | |
628 | { | |
629 | as_bad (_("unassigned file number %ld"), (long) filenum); | |
630 | return; | |
631 | } | |
632 | ||
633 | current.filenum = filenum; | |
634 | current.line = line; | |
92846e72 | 635 | current.discriminator = 0; |
ecea7679 RH |
636 | |
637 | #ifndef NO_LISTING | |
638 | if (listing) | |
639 | { | |
640 | if (files[filenum].dir) | |
641 | { | |
642 | size_t dir_len = strlen (dirs[files[filenum].dir]); | |
643 | size_t file_len = strlen (files[filenum].filename); | |
e1fa0163 | 644 | char *cp = (char *) xmalloc (dir_len + 1 + file_len + 1); |
ecea7679 RH |
645 | |
646 | memcpy (cp, dirs[files[filenum].dir], dir_len); | |
56487c55 | 647 | INSERT_DIR_SEPARATOR (cp, dir_len); |
ecea7679 RH |
648 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
649 | cp[dir_len + file_len + 1] = '\0'; | |
650 | listing_source_file (cp); | |
e1fa0163 | 651 | free (cp); |
ecea7679 RH |
652 | } |
653 | else | |
654 | listing_source_file (files[filenum].filename); | |
655 | listing_source_line (line); | |
656 | } | |
657 | #endif | |
658 | ||
220e750f | 659 | SKIP_WHITESPACE (); |
ecea7679 RH |
660 | if (ISDIGIT (*input_line_pointer)) |
661 | { | |
662 | current.column = get_absolute_expression (); | |
663 | SKIP_WHITESPACE (); | |
664 | } | |
665 | ||
666 | while (ISALPHA (*input_line_pointer)) | |
220e750f | 667 | { |
bd0eb99b RH |
668 | char *p, c; |
669 | offsetT value; | |
670 | ||
d02603dc | 671 | c = get_symbol_name (& p); |
bd0eb99b RH |
672 | |
673 | if (strcmp (p, "basic_block") == 0) | |
674 | { | |
675 | current.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
676 | *input_line_pointer = c; | |
677 | } | |
678 | else if (strcmp (p, "prologue_end") == 0) | |
679 | { | |
680 | current.flags |= DWARF2_FLAG_PROLOGUE_END; | |
681 | *input_line_pointer = c; | |
682 | } | |
683 | else if (strcmp (p, "epilogue_begin") == 0) | |
684 | { | |
685 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN; | |
686 | *input_line_pointer = c; | |
687 | } | |
688 | else if (strcmp (p, "is_stmt") == 0) | |
689 | { | |
d02603dc | 690 | (void) restore_line_pointer (c); |
bd0eb99b RH |
691 | value = get_absolute_expression (); |
692 | if (value == 0) | |
693 | current.flags &= ~DWARF2_FLAG_IS_STMT; | |
694 | else if (value == 1) | |
695 | current.flags |= DWARF2_FLAG_IS_STMT; | |
696 | else | |
ecea7679 RH |
697 | { |
698 | as_bad (_("is_stmt value not 0 or 1")); | |
699 | return; | |
700 | } | |
bd0eb99b RH |
701 | } |
702 | else if (strcmp (p, "isa") == 0) | |
703 | { | |
d02603dc | 704 | (void) restore_line_pointer (c); |
bd0eb99b | 705 | value = get_absolute_expression (); |
ecea7679 | 706 | if (value >= 0) |
bd0eb99b | 707 | current.isa = value; |
ecea7679 RH |
708 | else |
709 | { | |
710 | as_bad (_("isa number less than zero")); | |
711 | return; | |
712 | } | |
bd0eb99b | 713 | } |
92846e72 CC |
714 | else if (strcmp (p, "discriminator") == 0) |
715 | { | |
d02603dc | 716 | (void) restore_line_pointer (c); |
92846e72 CC |
717 | value = get_absolute_expression (); |
718 | if (value >= 0) | |
719 | current.discriminator = value; | |
720 | else | |
721 | { | |
722 | as_bad (_("discriminator less than zero")); | |
723 | return; | |
724 | } | |
725 | } | |
bd0eb99b RH |
726 | else |
727 | { | |
ecea7679 | 728 | as_bad (_("unknown .loc sub-directive `%s'"), p); |
d02603dc | 729 | (void) restore_line_pointer (c); |
bd0eb99b RH |
730 | return; |
731 | } | |
732 | ||
d02603dc | 733 | SKIP_WHITESPACE_AFTER_NAME (); |
bd0eb99b RH |
734 | } |
735 | ||
736 | demand_empty_rest_of_line (); | |
1eee4adc | 737 | dwarf2_loc_directive_seen = TRUE; |
7cadeb2c | 738 | debug_type = DEBUG_NONE; |
220e750f | 739 | } |
07a53e5c RH |
740 | |
741 | void | |
742 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) | |
743 | { | |
744 | offsetT value = get_absolute_expression (); | |
745 | ||
746 | if (value != 0 && value != 1) | |
747 | { | |
748 | as_bad (_("expected 0 or 1")); | |
749 | ignore_rest_of_line (); | |
750 | } | |
751 | else | |
752 | { | |
753 | dwarf2_loc_mark_labels = value != 0; | |
754 | demand_empty_rest_of_line (); | |
755 | } | |
756 | } | |
220e750f RH |
757 | \f |
758 | static struct frag * | |
a2e22468 | 759 | first_frag_for_seg (segT seg) |
220e750f | 760 | { |
c9049d30 | 761 | return seg_info (seg)->frchainP->frch_root; |
220e750f RH |
762 | } |
763 | ||
764 | static struct frag * | |
a2e22468 | 765 | last_frag_for_seg (segT seg) |
220e750f | 766 | { |
c9049d30 | 767 | frchainS *f = seg_info (seg)->frchainP; |
220e750f | 768 | |
c9049d30 AM |
769 | while (f->frch_next != NULL) |
770 | f = f->frch_next; | |
220e750f | 771 | |
c9049d30 | 772 | return f->frch_last; |
220e750f RH |
773 | } |
774 | \f | |
775 | /* Emit a single byte into the current segment. */ | |
776 | ||
777 | static inline void | |
a2e22468 | 778 | out_byte (int byte) |
220e750f RH |
779 | { |
780 | FRAG_APPEND_1_CHAR (byte); | |
781 | } | |
782 | ||
783 | /* Emit a statement program opcode into the current segment. */ | |
784 | ||
785 | static inline void | |
a2e22468 | 786 | out_opcode (int opc) |
220e750f RH |
787 | { |
788 | out_byte (opc); | |
789 | } | |
790 | ||
791 | /* Emit a two-byte word into the current segment. */ | |
792 | ||
793 | static inline void | |
a2e22468 | 794 | out_two (int data) |
220e750f RH |
795 | { |
796 | md_number_to_chars (frag_more (2), data, 2); | |
797 | } | |
798 | ||
799 | /* Emit a four byte word into the current segment. */ | |
800 | ||
801 | static inline void | |
a2e22468 | 802 | out_four (int data) |
220e750f RH |
803 | { |
804 | md_number_to_chars (frag_more (4), data, 4); | |
805 | } | |
806 | ||
807 | /* Emit an unsigned "little-endian base 128" number. */ | |
808 | ||
fac0d250 | 809 | static void |
a2e22468 | 810 | out_uleb128 (addressT value) |
220e750f RH |
811 | { |
812 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
813 | } | |
814 | ||
92846e72 CC |
815 | /* Emit a signed "little-endian base 128" number. */ |
816 | ||
817 | static void | |
818 | out_leb128 (addressT value) | |
819 | { | |
820 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); | |
821 | } | |
822 | ||
220e750f RH |
823 | /* Emit a tuple for .debug_abbrev. */ |
824 | ||
825 | static inline void | |
a2e22468 | 826 | out_abbrev (int name, int form) |
fac0d250 | 827 | { |
220e750f RH |
828 | out_uleb128 (name); |
829 | out_uleb128 (form); | |
830 | } | |
fac0d250 | 831 | |
220e750f | 832 | /* Get the size of a fragment. */ |
fac0d250 | 833 | |
220e750f | 834 | static offsetT |
c9049d30 | 835 | get_frag_fix (fragS *frag, segT seg) |
220e750f RH |
836 | { |
837 | frchainS *fr; | |
838 | ||
839 | if (frag->fr_next) | |
840 | return frag->fr_fix; | |
841 | ||
842 | /* If a fragment is the last in the chain, special measures must be | |
843 | taken to find its size before relaxation, since it may be pending | |
844 | on some subsegment chain. */ | |
c9049d30 | 845 | for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) |
220e750f | 846 | if (fr->frch_last == frag) |
c5c0a210 | 847 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
220e750f RH |
848 | |
849 | abort (); | |
850 | } | |
fac0d250 | 851 | |
220e750f | 852 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 853 | |
220e750f | 854 | static void |
07a53e5c | 855 | out_set_addr (symbolS *sym) |
220e750f | 856 | { |
91d6fa6a | 857 | expressionS exp; |
9e3af0e7 | 858 | |
fac0d250 | 859 | out_opcode (DW_LNS_extended_op); |
220e750f | 860 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
861 | |
862 | out_opcode (DW_LNE_set_address); | |
91d6fa6a NC |
863 | exp.X_op = O_symbol; |
864 | exp.X_add_symbol = sym; | |
865 | exp.X_add_number = 0; | |
866 | emit_expr (&exp, sizeof_address); | |
fac0d250 RH |
867 | } |
868 | ||
a2e22468 | 869 | static void scale_addr_delta (addressT *); |
c8970b4b | 870 | |
a3b75434 | 871 | static void |
d7342424 | 872 | scale_addr_delta (addressT *addr_delta) |
a3b75434 DD |
873 | { |
874 | static int printed_this = 0; | |
8fbf7334 | 875 | if (DWARF2_LINE_MIN_INSN_LENGTH > 1) |
a3b75434 | 876 | { |
8fbf7334 JL |
877 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this) |
878 | { | |
879 | as_bad("unaligned opcodes detected in executable segment"); | |
880 | printed_this = 1; | |
881 | } | |
882 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
a3b75434 | 883 | } |
a3b75434 | 884 | } |
a3b75434 | 885 | |
220e750f RH |
886 | /* Encode a pair of line and address skips as efficiently as possible. |
887 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 888 | |
220e750f RH |
889 | The following two routines *must* be kept in sync. This is |
890 | enforced by making emit_inc_line_addr abort if we do not emit | |
891 | exactly the expected number of bytes. */ | |
892 | ||
893 | static int | |
a2e22468 | 894 | size_inc_line_addr (int line_delta, addressT addr_delta) |
fac0d250 | 895 | { |
220e750f RH |
896 | unsigned int tmp, opcode; |
897 | int len = 0; | |
fac0d250 | 898 | |
220e750f | 899 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 | 900 | scale_addr_delta (&addr_delta); |
220e750f RH |
901 | |
902 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
903 | We cannot use special opcodes here, since we want the end_sequence | |
904 | to emit the matrix entry. */ | |
905 | if (line_delta == INT_MAX) | |
fac0d250 | 906 | { |
220e750f RH |
907 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
908 | len = 1; | |
fac0d250 | 909 | else |
220e750f RH |
910 | len = 1 + sizeof_leb128 (addr_delta, 0); |
911 | return len + 3; | |
fac0d250 | 912 | } |
fac0d250 | 913 | |
220e750f RH |
914 | /* Bias the line delta by the base. */ |
915 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 916 | |
220e750f RH |
917 | /* If the line increment is out of range of a special opcode, we |
918 | must encode it with DW_LNS_advance_line. */ | |
919 | if (tmp >= DWARF2_LINE_RANGE) | |
920 | { | |
921 | len = 1 + sizeof_leb128 (line_delta, 1); | |
922 | line_delta = 0; | |
923 | tmp = 0 - DWARF2_LINE_BASE; | |
924 | } | |
fac0d250 | 925 | |
220e750f RH |
926 | /* Bias the opcode by the special opcode base. */ |
927 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 928 | |
220e750f RH |
929 | /* Avoid overflow when addr_delta is large. */ |
930 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
931 | { | |
932 | /* Try using a special opcode. */ | |
933 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
934 | if (opcode <= 255) | |
935 | return len + 1; | |
936 | ||
937 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
938 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
939 | if (opcode <= 255) | |
940 | return len + 2; | |
941 | } | |
942 | ||
943 | /* Otherwise use DW_LNS_advance_pc. */ | |
944 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
945 | ||
946 | /* DW_LNS_copy or special opcode. */ | |
947 | len += 1; | |
948 | ||
949 | return len; | |
950 | } | |
fac0d250 | 951 | |
220e750f | 952 | static void |
a2e22468 | 953 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
220e750f RH |
954 | { |
955 | unsigned int tmp, opcode; | |
956 | int need_copy = 0; | |
957 | char *end = p + len; | |
fac0d250 | 958 | |
07a53e5c RH |
959 | /* Line number sequences cannot go backward in addresses. This means |
960 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 961 | gas_assert ((offsetT) addr_delta >= 0); |
07a53e5c | 962 | |
220e750f | 963 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 DD |
964 | scale_addr_delta (&addr_delta); |
965 | ||
220e750f RH |
966 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
967 | We cannot use special opcodes here, since we want the end_sequence | |
968 | to emit the matrix entry. */ | |
969 | if (line_delta == INT_MAX) | |
fac0d250 | 970 | { |
220e750f RH |
971 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
972 | *p++ = DW_LNS_const_add_pc; | |
973 | else | |
fac0d250 | 974 | { |
220e750f RH |
975 | *p++ = DW_LNS_advance_pc; |
976 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 977 | } |
220e750f RH |
978 | |
979 | *p++ = DW_LNS_extended_op; | |
980 | *p++ = 1; | |
981 | *p++ = DW_LNE_end_sequence; | |
982 | goto done; | |
fac0d250 RH |
983 | } |
984 | ||
220e750f RH |
985 | /* Bias the line delta by the base. */ |
986 | tmp = line_delta - DWARF2_LINE_BASE; | |
987 | ||
988 | /* If the line increment is out of range of a special opcode, we | |
989 | must encode it with DW_LNS_advance_line. */ | |
990 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 991 | { |
220e750f RH |
992 | *p++ = DW_LNS_advance_line; |
993 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 994 | |
220e750f RH |
995 | line_delta = 0; |
996 | tmp = 0 - DWARF2_LINE_BASE; | |
997 | need_copy = 1; | |
998 | } | |
fac0d250 | 999 | |
bd0eb99b RH |
1000 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
1001 | special opcode. */ | |
1002 | if (line_delta == 0 && addr_delta == 0) | |
1003 | { | |
1004 | *p++ = DW_LNS_copy; | |
1005 | goto done; | |
1006 | } | |
1007 | ||
220e750f RH |
1008 | /* Bias the opcode by the special opcode base. */ |
1009 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 1010 | |
220e750f RH |
1011 | /* Avoid overflow when addr_delta is large. */ |
1012 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 1013 | { |
220e750f RH |
1014 | /* Try using a special opcode. */ |
1015 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
1016 | if (opcode <= 255) | |
1017 | { | |
1018 | *p++ = opcode; | |
1019 | goto done; | |
1020 | } | |
1021 | ||
1022 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
1023 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
1024 | if (opcode <= 255) | |
fac0d250 | 1025 | { |
220e750f RH |
1026 | *p++ = DW_LNS_const_add_pc; |
1027 | *p++ = opcode; | |
1028 | goto done; | |
fac0d250 RH |
1029 | } |
1030 | } | |
220e750f RH |
1031 | |
1032 | /* Otherwise use DW_LNS_advance_pc. */ | |
1033 | *p++ = DW_LNS_advance_pc; | |
1034 | p += output_leb128 (p, addr_delta, 0); | |
1035 | ||
1036 | if (need_copy) | |
1037 | *p++ = DW_LNS_copy; | |
fac0d250 | 1038 | else |
220e750f | 1039 | *p++ = tmp; |
fac0d250 | 1040 | |
220e750f | 1041 | done: |
9c2799c2 | 1042 | gas_assert (p == end); |
220e750f | 1043 | } |
a8316fe2 | 1044 | |
220e750f | 1045 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 1046 | |
220e750f | 1047 | static void |
a2e22468 | 1048 | out_inc_line_addr (int line_delta, addressT addr_delta) |
220e750f RH |
1049 | { |
1050 | int len = size_inc_line_addr (line_delta, addr_delta); | |
1051 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
1052 | } | |
9de8d8f1 | 1053 | |
1737851b BW |
1054 | /* Write out an alternative form of line and address skips using |
1055 | DW_LNS_fixed_advance_pc opcodes. This uses more space than the default | |
7ddd14de BW |
1056 | line and address information, but it is required if linker relaxation |
1057 | could change the code offsets. The following two routines *must* be | |
1058 | kept in sync. */ | |
453dc3f0 | 1059 | #define ADDR_DELTA_LIMIT 50000 |
1737851b | 1060 | |
7ddd14de BW |
1061 | static int |
1062 | size_fixed_inc_line_addr (int line_delta, addressT addr_delta) | |
1737851b | 1063 | { |
7ddd14de | 1064 | int len = 0; |
1737851b BW |
1065 | |
1066 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ | |
7ddd14de BW |
1067 | if (line_delta != INT_MAX) |
1068 | len = 1 + sizeof_leb128 (line_delta, 1); | |
1069 | ||
453dc3f0 | 1070 | if (addr_delta > ADDR_DELTA_LIMIT) |
7ddd14de BW |
1071 | { |
1072 | /* DW_LNS_extended_op */ | |
1073 | len += 1 + sizeof_leb128 (sizeof_address + 1, 0); | |
1074 | /* DW_LNE_set_address */ | |
1075 | len += 1 + sizeof_address; | |
1076 | } | |
1077 | else | |
1078 | /* DW_LNS_fixed_advance_pc */ | |
1079 | len += 3; | |
1080 | ||
1737851b | 1081 | if (line_delta == INT_MAX) |
7ddd14de BW |
1082 | /* DW_LNS_extended_op + DW_LNE_end_sequence */ |
1083 | len += 3; | |
1084 | else | |
1085 | /* DW_LNS_copy */ | |
1086 | len += 1; | |
1087 | ||
1088 | return len; | |
1089 | } | |
1090 | ||
1091 | static void | |
1092 | emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, | |
1093 | char *p, int len) | |
1094 | { | |
91d6fa6a | 1095 | expressionS *pexp; |
7ddd14de BW |
1096 | char *end = p + len; |
1097 | ||
1098 | /* Line number sequences cannot go backward in addresses. This means | |
1099 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 1100 | gas_assert ((offsetT) addr_delta >= 0); |
7ddd14de | 1101 | |
b40bf0a2 NC |
1102 | /* Verify that we have kept in sync with size_fixed_inc_line_addr. */ |
1103 | gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta)); | |
1104 | ||
7ddd14de BW |
1105 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
1106 | if (line_delta != INT_MAX) | |
1107 | { | |
1108 | *p++ = DW_LNS_advance_line; | |
1109 | p += output_leb128 (p, line_delta, 1); | |
1110 | } | |
1111 | ||
91d6fa6a | 1112 | pexp = symbol_get_value_expression (frag->fr_symbol); |
7ddd14de BW |
1113 | |
1114 | /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can | |
1115 | advance the address by at most 64K. Linker relaxation (without | |
1116 | which this function would not be used) could change the operand by | |
1117 | an unknown amount. If the address increment is getting close to | |
1118 | the limit, just reset the address. */ | |
453dc3f0 | 1119 | if (addr_delta > ADDR_DELTA_LIMIT) |
1737851b | 1120 | { |
7ddd14de | 1121 | symbolS *to_sym; |
91d6fa6a | 1122 | expressionS exp; |
7ddd14de | 1123 | |
9f6db0d3 | 1124 | gas_assert (pexp->X_op == O_subtract); |
91d6fa6a | 1125 | to_sym = pexp->X_add_symbol; |
7ddd14de BW |
1126 | |
1127 | *p++ = DW_LNS_extended_op; | |
1128 | p += output_leb128 (p, sizeof_address + 1, 0); | |
1129 | *p++ = DW_LNE_set_address; | |
91d6fa6a NC |
1130 | exp.X_op = O_symbol; |
1131 | exp.X_add_symbol = to_sym; | |
1132 | exp.X_add_number = 0; | |
62ebcb5c | 1133 | emit_expr_fix (&exp, sizeof_address, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de BW |
1134 | p += sizeof_address; |
1135 | } | |
1136 | else | |
1137 | { | |
1138 | *p++ = DW_LNS_fixed_advance_pc; | |
62ebcb5c | 1139 | emit_expr_fix (pexp, 2, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de | 1140 | p += 2; |
1737851b BW |
1141 | } |
1142 | ||
7ddd14de BW |
1143 | if (line_delta == INT_MAX) |
1144 | { | |
1145 | *p++ = DW_LNS_extended_op; | |
1146 | *p++ = 1; | |
1147 | *p++ = DW_LNE_end_sequence; | |
1148 | } | |
1149 | else | |
1150 | *p++ = DW_LNS_copy; | |
1737851b | 1151 | |
9c2799c2 | 1152 | gas_assert (p == end); |
1737851b BW |
1153 | } |
1154 | ||
220e750f RH |
1155 | /* Generate a variant frag that we can use to relax address/line |
1156 | increments between fragments of the target segment. */ | |
9e3af0e7 | 1157 | |
220e750f | 1158 | static void |
07a53e5c | 1159 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
220e750f | 1160 | { |
91d6fa6a | 1161 | expressionS exp; |
220e750f | 1162 | int max_chars; |
6576f0b5 | 1163 | |
91d6fa6a NC |
1164 | exp.X_op = O_subtract; |
1165 | exp.X_add_symbol = to_sym; | |
1166 | exp.X_op_symbol = from_sym; | |
1167 | exp.X_add_number = 0; | |
fac0d250 | 1168 | |
220e750f RH |
1169 | /* The maximum size of the frag is the line delta with a maximum |
1170 | sized address delta. */ | |
7ddd14de BW |
1171 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1172 | max_chars = size_fixed_inc_line_addr (line_delta, | |
1173 | -DWARF2_LINE_MIN_INSN_LENGTH); | |
1174 | else | |
1175 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 1176 | |
220e750f | 1177 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
91d6fa6a | 1178 | make_expr_symbol (&exp), line_delta, NULL); |
220e750f | 1179 | } |
fac0d250 | 1180 | |
220e750f RH |
1181 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
1182 | based on the current values of the symbols. It is called before | |
1183 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 1184 | |
220e750f | 1185 | int |
a2e22468 | 1186 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
220e750f RH |
1187 | { |
1188 | offsetT addr_delta; | |
1189 | int size; | |
fac0d250 | 1190 | |
6386f3a7 | 1191 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
7ddd14de BW |
1192 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1193 | size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); | |
1194 | else | |
1195 | size = size_inc_line_addr (frag->fr_offset, addr_delta); | |
fac0d250 | 1196 | |
220e750f | 1197 | frag->fr_subtype = size; |
fac0d250 | 1198 | |
220e750f RH |
1199 | return size; |
1200 | } | |
1201 | ||
1202 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
1203 | current values of the symbols. fr_subtype is the current length | |
1204 | of the frag. This returns the change in frag length. */ | |
1205 | ||
1206 | int | |
a2e22468 | 1207 | dwarf2dbg_relax_frag (fragS *frag) |
220e750f RH |
1208 | { |
1209 | int old_size, new_size; | |
fac0d250 | 1210 | |
220e750f RH |
1211 | old_size = frag->fr_subtype; |
1212 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 1213 | |
220e750f | 1214 | return new_size - old_size; |
fac0d250 RH |
1215 | } |
1216 | ||
220e750f RH |
1217 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
1218 | fill frag. This is called after all relaxation has been done. | |
1219 | fr_subtype will be the desired length of the frag. */ | |
1220 | ||
1221 | void | |
a2e22468 | 1222 | dwarf2dbg_convert_frag (fragS *frag) |
fac0d250 | 1223 | { |
220e750f RH |
1224 | offsetT addr_diff; |
1225 | ||
453dc3f0 NC |
1226 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1227 | { | |
1228 | /* If linker relaxation is enabled then the distance bewteen the two | |
1229 | symbols in the frag->fr_symbol expression might change. Hence we | |
1230 | cannot rely upon the value computed by resolve_symbol_value. | |
1231 | Instead we leave the expression unfinalized and allow | |
1232 | emit_fixed_inc_line_addr to create a fixup (which later becomes a | |
1233 | relocation) that will allow the linker to correctly compute the | |
1234 | actual address difference. We have to use a fixed line advance for | |
1235 | this as we cannot (easily) relocate leb128 encoded values. */ | |
1236 | int saved_finalize_syms = finalize_syms; | |
1237 | ||
1238 | finalize_syms = 0; | |
1239 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
1240 | finalize_syms = saved_finalize_syms; | |
1241 | } | |
1242 | else | |
1243 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
fac0d250 | 1244 | |
220e750f RH |
1245 | /* fr_var carries the max_chars that we created the fragment with. |
1246 | fr_subtype carries the current expected length. We must, of | |
1247 | course, have allocated enough memory earlier. */ | |
9c2799c2 | 1248 | gas_assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 1249 | |
7ddd14de BW |
1250 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1251 | emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, | |
1252 | frag->fr_literal + frag->fr_fix, | |
1253 | frag->fr_subtype); | |
1254 | else | |
1255 | emit_inc_line_addr (frag->fr_offset, addr_diff, | |
1256 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); | |
220e750f RH |
1257 | |
1258 | frag->fr_fix += frag->fr_subtype; | |
1259 | frag->fr_type = rs_fill; | |
1260 | frag->fr_var = 0; | |
1261 | frag->fr_offset = 0; | |
1262 | } | |
1263 | ||
1264 | /* Generate .debug_line content for the chain of line number entries | |
1265 | beginning at E, for segment SEG. */ | |
1266 | ||
1267 | static void | |
a2e22468 | 1268 | process_entries (segT seg, struct line_entry *e) |
220e750f RH |
1269 | { |
1270 | unsigned filenum = 1; | |
1271 | unsigned line = 1; | |
1272 | unsigned column = 0; | |
bd0eb99b RH |
1273 | unsigned isa = 0; |
1274 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; | |
07a53e5c RH |
1275 | fragS *last_frag = NULL, *frag; |
1276 | addressT last_frag_ofs = 0, frag_ofs; | |
fead5cd9 | 1277 | symbolS *last_lab = NULL, *lab; |
220e750f RH |
1278 | struct line_entry *next; |
1279 | ||
b40bf0a2 NC |
1280 | if (flag_dwarf_sections) |
1281 | { | |
1282 | char * name; | |
1283 | const char * sec_name; | |
1284 | ||
1285 | /* Switch to the relevent sub-section before we start to emit | |
1286 | the line number table. | |
1287 | ||
1288 | FIXME: These sub-sections do not have a normal Line Number | |
1289 | Program Header, thus strictly speaking they are not valid | |
1290 | DWARF sections. Unfortunately the DWARF standard assumes | |
1291 | a one-to-one relationship between compilation units and | |
1292 | line number tables. Thus we have to have a .debug_line | |
1293 | section, as well as our sub-sections, and we have to ensure | |
1294 | that all of the sub-sections are merged into a proper | |
1295 | .debug_line section before a debugger sees them. */ | |
3739860c | 1296 | |
b40bf0a2 NC |
1297 | sec_name = bfd_get_section_name (stdoutput, seg); |
1298 | if (strcmp (sec_name, ".text") != 0) | |
1299 | { | |
1300 | unsigned int len; | |
1301 | ||
1302 | len = strlen (sec_name); | |
1303 | name = xmalloc (len + 11 + 2); | |
1304 | sprintf (name, ".debug_line%s", sec_name); | |
1305 | subseg_set (subseg_get (name, FALSE), 0); | |
1306 | } | |
1307 | else | |
1308 | /* Don't create a .debug_line.text section - | |
1309 | that is redundant. Instead just switch back to the | |
1310 | normal .debug_line section. */ | |
1311 | subseg_set (subseg_get (".debug_line", FALSE), 0); | |
1312 | } | |
1313 | ||
fead5cd9 | 1314 | do |
fac0d250 | 1315 | { |
07a53e5c | 1316 | int line_delta; |
220e750f RH |
1317 | |
1318 | if (filenum != e->loc.filenum) | |
fac0d250 | 1319 | { |
220e750f RH |
1320 | filenum = e->loc.filenum; |
1321 | out_opcode (DW_LNS_set_file); | |
1322 | out_uleb128 (filenum); | |
220e750f RH |
1323 | } |
1324 | ||
1325 | if (column != e->loc.column) | |
1326 | { | |
1327 | column = e->loc.column; | |
1328 | out_opcode (DW_LNS_set_column); | |
1329 | out_uleb128 (column); | |
220e750f RH |
1330 | } |
1331 | ||
92846e72 CC |
1332 | if (e->loc.discriminator != 0) |
1333 | { | |
1334 | out_opcode (DW_LNS_extended_op); | |
1335 | out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); | |
1336 | out_opcode (DW_LNE_set_discriminator); | |
1337 | out_uleb128 (e->loc.discriminator); | |
1338 | } | |
1339 | ||
bd0eb99b RH |
1340 | if (isa != e->loc.isa) |
1341 | { | |
1342 | isa = e->loc.isa; | |
1343 | out_opcode (DW_LNS_set_isa); | |
1344 | out_uleb128 (isa); | |
bd0eb99b RH |
1345 | } |
1346 | ||
1347 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT) | |
220e750f RH |
1348 | { |
1349 | flags = e->loc.flags; | |
1350 | out_opcode (DW_LNS_negate_stmt); | |
220e750f RH |
1351 | } |
1352 | ||
bd0eb99b | 1353 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) |
07a53e5c | 1354 | out_opcode (DW_LNS_set_basic_block); |
220e750f | 1355 | |
bd0eb99b | 1356 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) |
07a53e5c | 1357 | out_opcode (DW_LNS_set_prologue_end); |
bd0eb99b RH |
1358 | |
1359 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) | |
07a53e5c | 1360 | out_opcode (DW_LNS_set_epilogue_begin); |
bd0eb99b | 1361 | |
fb81275c JM |
1362 | /* Don't try to optimize away redundant entries; gdb wants two |
1363 | entries for a function where the code starts on the same line as | |
1364 | the {, and there's no way to identify that case here. Trust gcc | |
1365 | to optimize appropriately. */ | |
07a53e5c RH |
1366 | line_delta = e->loc.line - line; |
1367 | lab = e->label; | |
1368 | frag = symbol_get_frag (lab); | |
1369 | frag_ofs = S_GET_VALUE (lab); | |
220e750f | 1370 | |
07a53e5c | 1371 | if (last_frag == NULL) |
220e750f | 1372 | { |
07a53e5c RH |
1373 | out_set_addr (lab); |
1374 | out_inc_line_addr (line_delta, 0); | |
220e750f | 1375 | } |
7ddd14de | 1376 | else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c RH |
1377 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
1378 | else | |
1379 | relax_inc_line_addr (line_delta, lab, last_lab); | |
1380 | ||
1381 | line = e->loc.line; | |
1382 | last_lab = lab; | |
1383 | last_frag = frag; | |
1384 | last_frag_ofs = frag_ofs; | |
220e750f RH |
1385 | |
1386 | next = e->next; | |
1387 | free (e); | |
1388 | e = next; | |
fac0d250 | 1389 | } |
fead5cd9 | 1390 | while (e); |
353e2c69 | 1391 | |
220e750f | 1392 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
07a53e5c | 1393 | frag = last_frag_for_seg (seg); |
c9049d30 | 1394 | frag_ofs = get_frag_fix (frag, seg); |
7ddd14de | 1395 | if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c | 1396 | out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); |
220e750f | 1397 | else |
07a53e5c RH |
1398 | { |
1399 | lab = symbol_temp_new (seg, frag_ofs, frag); | |
1400 | relax_inc_line_addr (INT_MAX, lab, last_lab); | |
1401 | } | |
fac0d250 RH |
1402 | } |
1403 | ||
220e750f RH |
1404 | /* Emit the directory and file tables for .debug_line. */ |
1405 | ||
fac0d250 | 1406 | static void |
a2e22468 | 1407 | out_file_list (void) |
fac0d250 RH |
1408 | { |
1409 | size_t size; | |
3d6b762c | 1410 | const char *dir; |
fac0d250 | 1411 | char *cp; |
220e750f RH |
1412 | unsigned int i; |
1413 | ||
a7ed1ca2 NC |
1414 | /* Emit directory list. */ |
1415 | for (i = 1; i < dirs_in_use; ++i) | |
1416 | { | |
3d6b762c JM |
1417 | dir = remap_debug_filename (dirs[i]); |
1418 | size = strlen (dir) + 1; | |
a7ed1ca2 | 1419 | cp = frag_more (size); |
3d6b762c | 1420 | memcpy (cp, dir, size); |
a7ed1ca2 NC |
1421 | } |
1422 | /* Terminate it. */ | |
220e750f | 1423 | out_byte ('\0'); |
fac0d250 | 1424 | |
220e750f | 1425 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 1426 | { |
01e1a5bc NC |
1427 | const char *fullfilename; |
1428 | ||
249e3833 RH |
1429 | if (files[i].filename == NULL) |
1430 | { | |
0e389e77 | 1431 | as_bad (_("unassigned file number %ld"), (long) i); |
88b4ca40 RH |
1432 | /* Prevent a crash later, particularly for file 1. */ |
1433 | files[i].filename = ""; | |
249e3833 RH |
1434 | continue; |
1435 | } | |
1436 | ||
01e1a5bc NC |
1437 | fullfilename = DWARF2_FILE_NAME (files[i].filename, |
1438 | files[i].dir ? dirs [files [i].dir] : ""); | |
1439 | size = strlen (fullfilename) + 1; | |
fac0d250 | 1440 | cp = frag_more (size); |
01e1a5bc | 1441 | memcpy (cp, fullfilename, size); |
fac0d250 | 1442 | |
220e750f | 1443 | out_uleb128 (files[i].dir); /* directory number */ |
01e1a5bc NC |
1444 | /* Output the last modification timestamp. */ |
1445 | out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, | |
1446 | files[i].dir ? dirs [files [i].dir] : "")); | |
1447 | /* Output the filesize. */ | |
1448 | out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, | |
1449 | files[i].dir ? dirs [files [i].dir] : "")); | |
fac0d250 | 1450 | } |
353e2c69 KH |
1451 | |
1452 | /* Terminate filename list. */ | |
1453 | out_byte (0); | |
fac0d250 RH |
1454 | } |
1455 | ||
413a266c AM |
1456 | /* Switch to SEC and output a header length field. Return the size of |
1457 | offsets used in SEC. The caller must set EXPR->X_add_symbol value | |
d025d5e5 MW |
1458 | to the end of the section. EXPR->X_add_number will be set to the |
1459 | negative size of the header. */ | |
413a266c AM |
1460 | |
1461 | static int | |
91d6fa6a | 1462 | out_header (asection *sec, expressionS *exp) |
413a266c AM |
1463 | { |
1464 | symbolS *start_sym; | |
1465 | symbolS *end_sym; | |
1466 | ||
1467 | subseg_set (sec, 0); | |
b57dc16f | 1468 | |
0f8f0c57 NC |
1469 | if (flag_dwarf_sections) |
1470 | { | |
1471 | /* If we are going to put the start and end symbols in different | |
1472 | sections, then we need real symbols, not just fake, local ones. */ | |
1473 | frag_now_fix (); | |
1474 | start_sym = symbol_make (".Ldebug_line_start"); | |
1475 | end_sym = symbol_make (".Ldebug_line_end"); | |
1476 | symbol_set_value_now (start_sym); | |
1477 | } | |
1478 | else | |
0f8f0c57 NC |
1479 | { |
1480 | start_sym = symbol_temp_new_now (); | |
1481 | end_sym = symbol_temp_make (); | |
1482 | } | |
413a266c AM |
1483 | |
1484 | /* Total length of the information. */ | |
91d6fa6a NC |
1485 | exp->X_op = O_subtract; |
1486 | exp->X_add_symbol = end_sym; | |
1487 | exp->X_op_symbol = start_sym; | |
413a266c AM |
1488 | |
1489 | switch (DWARF2_FORMAT (sec)) | |
1490 | { | |
1491 | case dwarf2_format_32bit: | |
91d6fa6a NC |
1492 | exp->X_add_number = -4; |
1493 | emit_expr (exp, 4); | |
413a266c AM |
1494 | return 4; |
1495 | ||
1496 | case dwarf2_format_64bit: | |
91d6fa6a | 1497 | exp->X_add_number = -12; |
413a266c | 1498 | out_four (-1); |
91d6fa6a | 1499 | emit_expr (exp, 8); |
413a266c AM |
1500 | return 8; |
1501 | ||
1502 | case dwarf2_format_64bit_irix: | |
91d6fa6a NC |
1503 | exp->X_add_number = -8; |
1504 | emit_expr (exp, 8); | |
413a266c AM |
1505 | return 8; |
1506 | } | |
1507 | ||
1508 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1509 | return 0; | |
1510 | } | |
1511 | ||
220e750f RH |
1512 | /* Emit the collected .debug_line data. */ |
1513 | ||
1514 | static void | |
a2e22468 | 1515 | out_debug_line (segT line_seg) |
220e750f | 1516 | { |
91d6fa6a | 1517 | expressionS exp; |
02fe846e | 1518 | symbolS *prologue_start, *prologue_end; |
220e750f RH |
1519 | symbolS *line_end; |
1520 | struct line_seg *s; | |
14e777e0 | 1521 | int sizeof_offset; |
220e750f | 1522 | |
91d6fa6a NC |
1523 | sizeof_offset = out_header (line_seg, &exp); |
1524 | line_end = exp.X_add_symbol; | |
220e750f RH |
1525 | |
1526 | /* Version. */ | |
88ebb0a1 | 1527 | out_two (DWARF2_LINE_VERSION); |
220e750f RH |
1528 | |
1529 | /* Length of the prologue following this length. */ | |
02fe846e | 1530 | prologue_start = symbol_temp_make (); |
413a266c | 1531 | prologue_end = symbol_temp_make (); |
02fe846e | 1532 | exp.X_op = O_subtract; |
91d6fa6a | 1533 | exp.X_add_symbol = prologue_end; |
02fe846e AM |
1534 | exp.X_op_symbol = prologue_start; |
1535 | exp.X_add_number = 0; | |
91d6fa6a | 1536 | emit_expr (&exp, sizeof_offset); |
02fe846e | 1537 | symbol_set_value_now (prologue_start); |
220e750f RH |
1538 | |
1539 | /* Parameters of the state machine. */ | |
1540 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1541 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1542 | out_byte (DWARF2_LINE_BASE); | |
1543 | out_byte (DWARF2_LINE_RANGE); | |
1544 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1545 | ||
1546 | /* Standard opcode lengths. */ | |
1547 | out_byte (0); /* DW_LNS_copy */ | |
1548 | out_byte (1); /* DW_LNS_advance_pc */ | |
1549 | out_byte (1); /* DW_LNS_advance_line */ | |
1550 | out_byte (1); /* DW_LNS_set_file */ | |
1551 | out_byte (1); /* DW_LNS_set_column */ | |
1552 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1553 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1554 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1555 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
bd0eb99b RH |
1556 | out_byte (0); /* DW_LNS_set_prologue_end */ |
1557 | out_byte (0); /* DW_LNS_set_epilogue_begin */ | |
1558 | out_byte (1); /* DW_LNS_set_isa */ | |
220e750f RH |
1559 | |
1560 | out_file_list (); | |
1561 | ||
b7d6ed97 | 1562 | symbol_set_value_now (prologue_end); |
220e750f RH |
1563 | |
1564 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1565 | for (s = all_segs; s; s = s->next) |
9aec2026 NC |
1566 | if (SEG_NORMAL (s->seg)) |
1567 | process_entries (s->seg, s->head->head); | |
1568 | else | |
1569 | as_warn ("dwarf line number information for %s ignored", | |
1570 | segment_name (s->seg)); | |
220e750f | 1571 | |
b40bf0a2 NC |
1572 | if (flag_dwarf_sections) |
1573 | /* We have to switch to the special .debug_line_end section | |
1574 | before emitting the end-of-debug_line symbol. The linker | |
1575 | script arranges for this section to be placed after all the | |
1576 | (potentially garbage collected) .debug_line.<foo> sections. | |
1577 | This section contains the line_end symbol which is used to | |
1578 | compute the size of the linked .debug_line section, as seen | |
1579 | in the DWARF Line Number header. */ | |
1580 | subseg_set (subseg_get (".debug_line_end", FALSE), 0); | |
1581 | ||
b7d6ed97 | 1582 | symbol_set_value_now (line_end); |
220e750f RH |
1583 | } |
1584 | ||
802f5d9e NC |
1585 | static void |
1586 | out_debug_ranges (segT ranges_seg) | |
1587 | { | |
1588 | unsigned int addr_size = sizeof_address; | |
1589 | struct line_seg *s; | |
91d6fa6a | 1590 | expressionS exp; |
802f5d9e NC |
1591 | unsigned int i; |
1592 | ||
1593 | subseg_set (ranges_seg, 0); | |
1594 | ||
1595 | /* Base Address Entry. */ | |
7fd3924a | 1596 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1597 | out_byte (0xff); |
7fd3924a | 1598 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1599 | out_byte (0); |
1600 | ||
1601 | /* Range List Entry. */ | |
1602 | for (s = all_segs; s; s = s->next) | |
1603 | { | |
1604 | fragS *frag; | |
1605 | symbolS *beg, *end; | |
1606 | ||
1607 | frag = first_frag_for_seg (s->seg); | |
1608 | beg = symbol_temp_new (s->seg, 0, frag); | |
1609 | s->text_start = beg; | |
1610 | ||
1611 | frag = last_frag_for_seg (s->seg); | |
1612 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); | |
1613 | s->text_end = end; | |
1614 | ||
91d6fa6a NC |
1615 | exp.X_op = O_symbol; |
1616 | exp.X_add_symbol = beg; | |
1617 | exp.X_add_number = 0; | |
1618 | emit_expr (&exp, addr_size); | |
802f5d9e | 1619 | |
91d6fa6a NC |
1620 | exp.X_op = O_symbol; |
1621 | exp.X_add_symbol = end; | |
1622 | exp.X_add_number = 0; | |
1623 | emit_expr (&exp, addr_size); | |
802f5d9e NC |
1624 | } |
1625 | ||
1626 | /* End of Range Entry. */ | |
7fd3924a | 1627 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1628 | out_byte (0); |
7fd3924a | 1629 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1630 | out_byte (0); |
1631 | } | |
1632 | ||
220e750f RH |
1633 | /* Emit data for .debug_aranges. */ |
1634 | ||
58b5739a | 1635 | static void |
a2e22468 | 1636 | out_debug_aranges (segT aranges_seg, segT info_seg) |
fac0d250 | 1637 | { |
220e750f | 1638 | unsigned int addr_size = sizeof_address; |
d025d5e5 | 1639 | offsetT size; |
220e750f | 1640 | struct line_seg *s; |
91d6fa6a | 1641 | expressionS exp; |
413a266c | 1642 | symbolS *aranges_end; |
220e750f | 1643 | char *p; |
413a266c | 1644 | int sizeof_offset; |
fac0d250 | 1645 | |
91d6fa6a NC |
1646 | sizeof_offset = out_header (aranges_seg, &exp); |
1647 | aranges_end = exp.X_add_symbol; | |
d025d5e5 | 1648 | size = -exp.X_add_number; |
fac0d250 | 1649 | |
220e750f | 1650 | /* Version. */ |
88ebb0a1 | 1651 | out_two (DWARF2_ARANGES_VERSION); |
d025d5e5 | 1652 | size += 2; |
4dc7ead9 | 1653 | |
220e750f | 1654 | /* Offset to .debug_info. */ |
413a266c | 1655 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); |
d025d5e5 | 1656 | size += sizeof_offset; |
220e750f RH |
1657 | |
1658 | /* Size of an address (offset portion). */ | |
1659 | out_byte (addr_size); | |
d025d5e5 | 1660 | size++; |
220e750f RH |
1661 | |
1662 | /* Size of a segment descriptor. */ | |
1663 | out_byte (0); | |
d025d5e5 | 1664 | size++; |
220e750f RH |
1665 | |
1666 | /* Align the header. */ | |
d025d5e5 MW |
1667 | while ((size++ % (2 * addr_size)) > 0) |
1668 | out_byte (0); | |
4dc7ead9 | 1669 | |
ee515fb7 | 1670 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1671 | { |
1672 | fragS *frag; | |
1673 | symbolS *beg, *end; | |
1674 | ||
1675 | frag = first_frag_for_seg (s->seg); | |
b7d6ed97 | 1676 | beg = symbol_temp_new (s->seg, 0, frag); |
220e750f RH |
1677 | s->text_start = beg; |
1678 | ||
1679 | frag = last_frag_for_seg (s->seg); | |
c9049d30 | 1680 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
220e750f RH |
1681 | s->text_end = end; |
1682 | ||
91d6fa6a NC |
1683 | exp.X_op = O_symbol; |
1684 | exp.X_add_symbol = beg; | |
1685 | exp.X_add_number = 0; | |
1686 | emit_expr (&exp, addr_size); | |
220e750f | 1687 | |
91d6fa6a NC |
1688 | exp.X_op = O_subtract; |
1689 | exp.X_add_symbol = end; | |
1690 | exp.X_op_symbol = beg; | |
1691 | exp.X_add_number = 0; | |
1692 | emit_expr (&exp, addr_size); | |
220e750f | 1693 | } |
4dc7ead9 | 1694 | |
220e750f RH |
1695 | p = frag_more (2 * addr_size); |
1696 | md_number_to_chars (p, 0, addr_size); | |
1697 | md_number_to_chars (p + addr_size, 0, addr_size); | |
413a266c AM |
1698 | |
1699 | symbol_set_value_now (aranges_end); | |
4dc7ead9 RH |
1700 | } |
1701 | ||
220e750f RH |
1702 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1703 | sync with out_debug_info below. */ | |
fac0d250 | 1704 | |
220e750f | 1705 | static void |
413a266c AM |
1706 | out_debug_abbrev (segT abbrev_seg, |
1707 | segT info_seg ATTRIBUTE_UNUSED, | |
1708 | segT line_seg ATTRIBUTE_UNUSED) | |
220e750f RH |
1709 | { |
1710 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1711 | |
220e750f RH |
1712 | out_uleb128 (1); |
1713 | out_uleb128 (DW_TAG_compile_unit); | |
1714 | out_byte (DW_CHILDREN_no); | |
413a266c AM |
1715 | if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) |
1716 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1717 | else | |
1718 | out_abbrev (DW_AT_stmt_list, DW_FORM_data8); | |
220e750f | 1719 | if (all_segs->next == NULL) |
4dc7ead9 | 1720 | { |
220e750f | 1721 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
88ebb0a1 MW |
1722 | if (DWARF2_VERSION < 4) |
1723 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1724 | else | |
1725 | out_abbrev (DW_AT_high_pc, (sizeof_address == 4 | |
1726 | ? DW_FORM_data4 : DW_FORM_data8)); | |
220e750f | 1727 | } |
802f5d9e NC |
1728 | else |
1729 | { | |
413a266c | 1730 | if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) |
802f5d9e NC |
1731 | out_abbrev (DW_AT_ranges, DW_FORM_data4); |
1732 | else | |
1733 | out_abbrev (DW_AT_ranges, DW_FORM_data8); | |
1734 | } | |
48b91938 | 1735 | out_abbrev (DW_AT_name, DW_FORM_string); |
220e750f RH |
1736 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
1737 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1738 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1739 | out_abbrev (0, 0); | |
a987bfc9 RH |
1740 | |
1741 | /* Terminate the abbreviations for this compilation unit. */ | |
1742 | out_byte (0); | |
220e750f | 1743 | } |
4dc7ead9 | 1744 | |
220e750f | 1745 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1746 | |
220e750f | 1747 | static void |
802f5d9e | 1748 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) |
220e750f RH |
1749 | { |
1750 | char producer[128]; | |
3d6b762c JM |
1751 | const char *comp_dir; |
1752 | const char *dirname; | |
91d6fa6a | 1753 | expressionS exp; |
220e750f RH |
1754 | symbolS *info_end; |
1755 | char *p; | |
1756 | int len; | |
14e777e0 | 1757 | int sizeof_offset; |
4dc7ead9 | 1758 | |
91d6fa6a NC |
1759 | sizeof_offset = out_header (info_seg, &exp); |
1760 | info_end = exp.X_add_symbol; | |
4dc7ead9 | 1761 | |
220e750f | 1762 | /* DWARF version. */ |
fc0eebac | 1763 | out_two (DWARF2_VERSION); |
4dc7ead9 | 1764 | |
220e750f | 1765 | /* .debug_abbrev offset */ |
6174d9c8 | 1766 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
4dc7ead9 | 1767 | |
220e750f RH |
1768 | /* Target address size. */ |
1769 | out_byte (sizeof_address); | |
fac0d250 | 1770 | |
220e750f RH |
1771 | /* DW_TAG_compile_unit DIE abbrev */ |
1772 | out_uleb128 (1); | |
fac0d250 | 1773 | |
220e750f | 1774 | /* DW_AT_stmt_list */ |
413a266c AM |
1775 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), |
1776 | (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit | |
1777 | ? 4 : 8)); | |
fac0d250 | 1778 | |
802f5d9e | 1779 | /* These two attributes are emitted if all of the code is contiguous. */ |
220e750f | 1780 | if (all_segs->next == NULL) |
58b5739a | 1781 | { |
220e750f | 1782 | /* DW_AT_low_pc */ |
91d6fa6a NC |
1783 | exp.X_op = O_symbol; |
1784 | exp.X_add_symbol = all_segs->text_start; | |
1785 | exp.X_add_number = 0; | |
1786 | emit_expr (&exp, sizeof_address); | |
220e750f RH |
1787 | |
1788 | /* DW_AT_high_pc */ | |
88ebb0a1 MW |
1789 | if (DWARF2_VERSION < 4) |
1790 | exp.X_op = O_symbol; | |
1791 | else | |
1792 | { | |
1793 | exp.X_op = O_subtract; | |
1794 | exp.X_op_symbol = all_segs->text_start; | |
1795 | } | |
91d6fa6a NC |
1796 | exp.X_add_symbol = all_segs->text_end; |
1797 | exp.X_add_number = 0; | |
1798 | emit_expr (&exp, sizeof_address); | |
58b5739a | 1799 | } |
802f5d9e NC |
1800 | else |
1801 | { | |
eb1fe072 NC |
1802 | /* This attribute is emitted if the code is disjoint. */ |
1803 | /* DW_AT_ranges. */ | |
1804 | TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); | |
802f5d9e | 1805 | } |
58b5739a | 1806 | |
48b91938 RH |
1807 | /* DW_AT_name. We don't have the actual file name that was present |
1808 | on the command line, so assume files[1] is the main input file. | |
1809 | We're not supposed to get called unless at least one line number | |
1810 | entry was emitted, so this should always be defined. */ | |
7fd3924a | 1811 | if (files_in_use == 0) |
48b91938 | 1812 | abort (); |
a7ed1ca2 NC |
1813 | if (files[1].dir) |
1814 | { | |
3d6b762c JM |
1815 | dirname = remap_debug_filename (dirs[files[1].dir]); |
1816 | len = strlen (dirname); | |
198f1251 TG |
1817 | #ifdef TE_VMS |
1818 | /* Already has trailing slash. */ | |
1819 | p = frag_more (len); | |
1820 | memcpy (p, dirname, len); | |
1821 | #else | |
a7ed1ca2 | 1822 | p = frag_more (len + 1); |
3d6b762c | 1823 | memcpy (p, dirname, len); |
56487c55 | 1824 | INSERT_DIR_SEPARATOR (p, len); |
198f1251 | 1825 | #endif |
a7ed1ca2 | 1826 | } |
48b91938 RH |
1827 | len = strlen (files[1].filename) + 1; |
1828 | p = frag_more (len); | |
1829 | memcpy (p, files[1].filename, len); | |
1830 | ||
220e750f | 1831 | /* DW_AT_comp_dir */ |
3d6b762c | 1832 | comp_dir = remap_debug_filename (getpwd ()); |
220e750f RH |
1833 | len = strlen (comp_dir) + 1; |
1834 | p = frag_more (len); | |
1835 | memcpy (p, comp_dir, len); | |
fac0d250 | 1836 | |
220e750f RH |
1837 | /* DW_AT_producer */ |
1838 | sprintf (producer, "GNU AS %s", VERSION); | |
1839 | len = strlen (producer) + 1; | |
1840 | p = frag_more (len); | |
1841 | memcpy (p, producer, len); | |
fac0d250 | 1842 | |
220e750f RH |
1843 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1844 | dwarf2 draft has no standard code for assembler. */ | |
1845 | out_two (DW_LANG_Mips_Assembler); | |
1846 | ||
b7d6ed97 | 1847 | symbol_set_value_now (info_end); |
fac0d250 RH |
1848 | } |
1849 | ||
1e9cc1c2 NC |
1850 | void |
1851 | dwarf2_init (void) | |
1852 | { | |
1e9cc1c2 NC |
1853 | last_seg_ptr = &all_segs; |
1854 | } | |
1855 | ||
1856 | ||
c6cb92c5 NS |
1857 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
1858 | were any .file/.loc directives, or --gdwarf2 was given, or if the | |
df1c40a7 L |
1859 | file has a non-empty .debug_info section and an empty .debug_line |
1860 | section. If we emit .debug_line, and the .debug_info section is | |
1861 | empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. | |
1862 | ALL_SEGS will be non-null if there were any .file/.loc directives, | |
1863 | or --gdwarf2 was given and there were any located instructions | |
1864 | emitted. */ | |
c6cb92c5 | 1865 | |
fac0d250 | 1866 | void |
a2e22468 | 1867 | dwarf2_finish (void) |
fac0d250 | 1868 | { |
220e750f RH |
1869 | segT line_seg; |
1870 | struct line_seg *s; | |
c6cb92c5 NS |
1871 | segT info_seg; |
1872 | int emit_other_sections = 0; | |
df1c40a7 | 1873 | int empty_debug_line = 0; |
c6cb92c5 NS |
1874 | |
1875 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); | |
1876 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); | |
fac0d250 | 1877 | |
df1c40a7 L |
1878 | line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); |
1879 | empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); | |
1880 | ||
1881 | /* We can't construct a new debug_line section if we already have one. | |
1882 | Give an error. */ | |
1883 | if (all_segs && !empty_debug_line) | |
1884 | as_fatal ("duplicate .debug_line sections"); | |
1885 | ||
1886 | if ((!all_segs && emit_other_sections) | |
1887 | || (!emit_other_sections && !empty_debug_line)) | |
1888 | /* If there is no line information and no non-empty .debug_info | |
1889 | section, or if there is both a non-empty .debug_info and a non-empty | |
1890 | .debug_line, then we do nothing. */ | |
220e750f | 1891 | return; |
fac0d250 | 1892 | |
220e750f | 1893 | /* Calculate the size of an address for the target machine. */ |
9605f328 | 1894 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
fac0d250 | 1895 | |
220e750f RH |
1896 | /* Create and switch to the line number section. */ |
1897 | line_seg = subseg_new (".debug_line", 0); | |
8a7140c3 | 1898 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
fac0d250 | 1899 | |
220e750f | 1900 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1901 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1902 | { |
91d6fa6a NC |
1903 | struct line_subseg *lss = s->head; |
1904 | struct line_entry **ptail = lss->ptail; | |
220e750f | 1905 | |
91d6fa6a | 1906 | while ((lss = lss->next) != NULL) |
220e750f | 1907 | { |
91d6fa6a NC |
1908 | *ptail = lss->head; |
1909 | ptail = lss->ptail; | |
220e750f | 1910 | } |
fac0d250 | 1911 | } |
85a39694 | 1912 | |
220e750f | 1913 | out_debug_line (line_seg); |
85a39694 | 1914 | |
c6cb92c5 NS |
1915 | /* If this is assembler generated line info, and there is no |
1916 | debug_info already, we need .debug_info and .debug_abbrev | |
1917 | sections as well. */ | |
1918 | if (emit_other_sections) | |
220e750f RH |
1919 | { |
1920 | segT abbrev_seg; | |
220e750f | 1921 | segT aranges_seg; |
802f5d9e | 1922 | segT ranges_seg; |
4dc7ead9 | 1923 | |
9c2799c2 | 1924 | gas_assert (all_segs); |
7fd3924a | 1925 | |
220e750f RH |
1926 | info_seg = subseg_new (".debug_info", 0); |
1927 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1928 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1929 | |
8a7140c3 NC |
1930 | bfd_set_section_flags (stdoutput, info_seg, |
1931 | SEC_READONLY | SEC_DEBUGGING); | |
1932 | bfd_set_section_flags (stdoutput, abbrev_seg, | |
1933 | SEC_READONLY | SEC_DEBUGGING); | |
1934 | bfd_set_section_flags (stdoutput, aranges_seg, | |
1935 | SEC_READONLY | SEC_DEBUGGING); | |
ef99799a | 1936 | |
ee515fb7 | 1937 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1938 | |
802f5d9e NC |
1939 | if (all_segs->next == NULL) |
1940 | ranges_seg = NULL; | |
1941 | else | |
1942 | { | |
1943 | ranges_seg = subseg_new (".debug_ranges", 0); | |
7fd3924a | 1944 | bfd_set_section_flags (stdoutput, ranges_seg, |
802f5d9e NC |
1945 | SEC_READONLY | SEC_DEBUGGING); |
1946 | record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); | |
1947 | out_debug_ranges (ranges_seg); | |
1948 | } | |
1949 | ||
220e750f | 1950 | out_debug_aranges (aranges_seg, info_seg); |
413a266c | 1951 | out_debug_abbrev (abbrev_seg, info_seg, line_seg); |
802f5d9e | 1952 | out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg); |
220e750f | 1953 | } |
85a39694 | 1954 | } |