Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
4b95cf5c | 2 | Copyright (C) 1999-2014 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 NC |
189 | /* Hash used to quickly lookup a segment by name, avoiding the need to search |
190 | through the all_segs list. */ | |
191 | static struct hash_control *all_segs_hash; | |
192 | static struct line_seg **last_seg_ptr; | |
220e750f | 193 | |
ee515fb7 | 194 | struct file_entry { |
a7ed1ca2 | 195 | const char *filename; |
220e750f RH |
196 | unsigned int dir; |
197 | }; | |
198 | ||
199 | /* Table of files used by .debug_line. */ | |
200 | static struct file_entry *files; | |
201 | static unsigned int files_in_use; | |
202 | static unsigned int files_allocated; | |
203 | ||
a7ed1ca2 NC |
204 | /* Table of directories used by .debug_line. */ |
205 | static char **dirs; | |
206 | static unsigned int dirs_in_use; | |
207 | static unsigned int dirs_allocated; | |
208 | ||
b34976b6 | 209 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
220e750f | 210 | doing work when there's nothing to do. */ |
1eee4adc | 211 | bfd_boolean dwarf2_loc_directive_seen; |
220e750f | 212 | |
07a53e5c RH |
213 | /* TRUE when we're supposed to set the basic block mark whenever a |
214 | label is seen. */ | |
215 | bfd_boolean dwarf2_loc_mark_labels; | |
216 | ||
220e750f | 217 | /* Current location as indicated by the most recent .loc directive. */ |
bd0eb99b RH |
218 | static struct dwarf2_line_info current = { |
219 | 1, 1, 0, 0, | |
92846e72 CC |
220 | DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, |
221 | 0 | |
bd0eb99b | 222 | }; |
220e750f | 223 | |
220e750f RH |
224 | /* The size of an address on the target. */ |
225 | static unsigned int sizeof_address; | |
226 | \f | |
a2e22468 | 227 | static unsigned int get_filenum (const char *, unsigned int); |
413a266c | 228 | |
c5c0a210 | 229 | #ifndef TC_DWARF2_EMIT_OFFSET |
802f5d9e | 230 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
c5c0a210 | 231 | |
6174d9c8 RH |
232 | /* Create an offset to .dwarf2_*. */ |
233 | ||
234 | static void | |
a2e22468 | 235 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
6174d9c8 | 236 | { |
91d6fa6a | 237 | expressionS exp; |
6174d9c8 | 238 | |
91d6fa6a NC |
239 | exp.X_op = O_symbol; |
240 | exp.X_add_symbol = symbol; | |
241 | exp.X_add_number = 0; | |
242 | emit_expr (&exp, size); | |
6174d9c8 | 243 | } |
c5c0a210 | 244 | #endif |
6174d9c8 | 245 | |
e410add4 | 246 | /* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */ |
220e750f RH |
247 | |
248 | static struct line_subseg * | |
e410add4 | 249 | get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p) |
220e750f RH |
250 | { |
251 | static segT last_seg; | |
252 | static subsegT last_subseg; | |
253 | static struct line_subseg *last_line_subseg; | |
254 | ||
1e9cc1c2 | 255 | struct line_seg *s; |
91d6fa6a | 256 | struct line_subseg **pss, *lss; |
fac0d250 | 257 | |
220e750f RH |
258 | if (seg == last_seg && subseg == last_subseg) |
259 | return last_line_subseg; | |
260 | ||
1e9cc1c2 NC |
261 | s = (struct line_seg *) hash_find (all_segs_hash, seg->name); |
262 | if (s == NULL) | |
263 | { | |
e410add4 RS |
264 | if (!create_p) |
265 | return NULL; | |
266 | ||
1e9cc1c2 NC |
267 | s = (struct line_seg *) xmalloc (sizeof (*s)); |
268 | s->next = NULL; | |
269 | s->seg = seg; | |
270 | s->head = NULL; | |
271 | *last_seg_ptr = s; | |
272 | last_seg_ptr = &s->next; | |
273 | hash_insert (all_segs_hash, seg->name, s); | |
274 | } | |
275 | gas_assert (seg == s->seg); | |
220e750f | 276 | |
91d6fa6a | 277 | for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) |
fac0d250 | 278 | { |
91d6fa6a | 279 | if (lss->subseg == subseg) |
ee515fb7 | 280 | goto found_subseg; |
91d6fa6a | 281 | if (lss->subseg > subseg) |
220e750f | 282 | break; |
fac0d250 | 283 | } |
220e750f | 284 | |
91d6fa6a NC |
285 | lss = (struct line_subseg *) xmalloc (sizeof (*lss)); |
286 | lss->next = *pss; | |
287 | lss->subseg = subseg; | |
288 | lss->head = NULL; | |
289 | lss->ptail = &lss->head; | |
e410add4 | 290 | lss->pmove_tail = &lss->head; |
91d6fa6a | 291 | *pss = lss; |
220e750f RH |
292 | |
293 | found_subseg: | |
294 | last_seg = seg; | |
295 | last_subseg = subseg; | |
91d6fa6a | 296 | last_line_subseg = lss; |
220e750f | 297 | |
91d6fa6a | 298 | return lss; |
fac0d250 RH |
299 | } |
300 | ||
6a50d470 | 301 | /* Record an entry for LOC occurring at LABEL. */ |
07a53e5c RH |
302 | |
303 | static void | |
6a50d470 | 304 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
07a53e5c | 305 | { |
6a50d470 | 306 | struct line_subseg *lss; |
07a53e5c RH |
307 | struct line_entry *e; |
308 | ||
309 | e = (struct line_entry *) xmalloc (sizeof (*e)); | |
310 | e->next = NULL; | |
6a50d470 | 311 | e->label = label; |
07a53e5c RH |
312 | e->loc = *loc; |
313 | ||
e410add4 | 314 | lss = get_line_subseg (now_seg, now_subseg, TRUE); |
6a50d470 RS |
315 | *lss->ptail = e; |
316 | lss->ptail = &e->next; | |
07a53e5c RH |
317 | } |
318 | ||
436d9e46 | 319 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
353e2c69 | 320 | |
220e750f | 321 | void |
a2e22468 | 322 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
fac0d250 | 323 | { |
1ea5c325 MS |
324 | static unsigned int line = -1; |
325 | static unsigned int filenum = -1; | |
220e750f | 326 | |
6a50d470 RS |
327 | symbolS *sym; |
328 | ||
220e750f RH |
329 | /* Early out for as-yet incomplete location information. */ |
330 | if (loc->filenum == 0 || loc->line == 0) | |
331 | return; | |
332 | ||
ffa554ed GK |
333 | /* Don't emit sequences of line symbols for the same line when the |
334 | symbols apply to assembler code. It is necessary to emit | |
335 | duplicate line symbols when a compiler asks for them, because GDB | |
336 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 337 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 338 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
339 | return; |
340 | ||
341 | line = loc->line; | |
342 | filenum = loc->filenum; | |
343 | ||
453dc3f0 NC |
344 | if (linkrelax) |
345 | { | |
346 | char name[120]; | |
347 | ||
348 | /* Use a non-fake name for the line number location, | |
349 | so that it can be referred to by relocations. */ | |
350 | sprintf (name, ".Loc.%u.%u", line, filenum); | |
6a50d470 | 351 | sym = symbol_new (name, now_seg, ofs, frag_now); |
453dc3f0 NC |
352 | } |
353 | else | |
6a50d470 RS |
354 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
355 | dwarf2_gen_line_info_1 (sym, loc); | |
220e750f | 356 | } |
fac0d250 | 357 | |
ecea7679 RH |
358 | /* Returns the current source information. If .file directives have |
359 | been encountered, the info for the corresponding source file is | |
360 | returned. Otherwise, the info for the assembly source file is | |
361 | returned. */ | |
362 | ||
220e750f | 363 | void |
a2e22468 | 364 | dwarf2_where (struct dwarf2_line_info *line) |
220e750f RH |
365 | { |
366 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 367 | { |
220e750f RH |
368 | char *filename; |
369 | as_where (&filename, &line->line); | |
a7ed1ca2 | 370 | line->filenum = get_filenum (filename, 0); |
220e750f | 371 | line->column = 0; |
bd0eb99b | 372 | line->flags = DWARF2_FLAG_IS_STMT; |
ecea7679 | 373 | line->isa = current.isa; |
92846e72 | 374 | line->discriminator = current.discriminator; |
fac0d250 | 375 | } |
220e750f RH |
376 | else |
377 | *line = current; | |
fac0d250 RH |
378 | } |
379 | ||
7fd3924a | 380 | /* A hook to allow the target backend to inform the line number state |
ecea7679 RH |
381 | machine of isa changes when assembler debug info is enabled. */ |
382 | ||
383 | void | |
384 | dwarf2_set_isa (unsigned int isa) | |
385 | { | |
386 | current.isa = isa; | |
387 | } | |
388 | ||
220e750f RH |
389 | /* Called for each machine instruction, or relatively atomic group of |
390 | machine instructions (ie built-in macro). The instruction or group | |
391 | is SIZE bytes in length. If dwarf2 line number generation is called | |
392 | for, emit a line statement appropriately. */ | |
353e2c69 | 393 | |
220e750f | 394 | void |
a2e22468 | 395 | dwarf2_emit_insn (int size) |
fac0d250 | 396 | { |
220e750f | 397 | struct dwarf2_line_info loc; |
fac0d250 | 398 | |
7fd3924a | 399 | if (!dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2) |
220e750f | 400 | return; |
7fd3924a AM |
401 | |
402 | dwarf2_where (&loc); | |
b6675117 | 403 | |
220e750f | 404 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
661ba50f BW |
405 | dwarf2_consume_line_info (); |
406 | } | |
407 | ||
e410add4 RS |
408 | /* Move all previously-emitted line entries for the current position by |
409 | DELTA bytes. This function cannot be used to move the same entries | |
410 | twice. */ | |
411 | ||
412 | void | |
413 | dwarf2_move_insn (int delta) | |
414 | { | |
415 | struct line_subseg *lss; | |
416 | struct line_entry *e; | |
417 | valueT now; | |
418 | ||
419 | if (delta == 0) | |
420 | return; | |
421 | ||
422 | lss = get_line_subseg (now_seg, now_subseg, FALSE); | |
423 | if (!lss) | |
424 | return; | |
425 | ||
426 | now = frag_now_fix (); | |
427 | while ((e = *lss->pmove_tail)) | |
428 | { | |
429 | if (S_GET_VALUE (e->label) == now) | |
430 | S_SET_VALUE (e->label, now + delta); | |
431 | lss->pmove_tail = &e->next; | |
432 | } | |
433 | } | |
434 | ||
661ba50f BW |
435 | /* Called after the current line information has been either used with |
436 | dwarf2_gen_line_info or saved with a machine instruction for later use. | |
437 | This resets the state of the line number information to reflect that | |
438 | it has been used. */ | |
439 | ||
440 | void | |
441 | dwarf2_consume_line_info (void) | |
442 | { | |
443 | /* Unless we generate DWARF2 debugging information for each | |
444 | assembler line, we only emit one line symbol for one LOC. */ | |
7fd3924a | 445 | dwarf2_loc_directive_seen = FALSE; |
bd0eb99b RH |
446 | |
447 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK | |
448 | | DWARF2_FLAG_PROLOGUE_END | |
449 | | DWARF2_FLAG_EPILOGUE_BEGIN); | |
92846e72 | 450 | current.discriminator = 0; |
220e750f | 451 | } |
fac0d250 | 452 | |
07a53e5c RH |
453 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
454 | is enabled, emit a basic block marker. */ | |
455 | ||
456 | void | |
457 | dwarf2_emit_label (symbolS *label) | |
458 | { | |
459 | struct dwarf2_line_info loc; | |
460 | ||
461 | if (!dwarf2_loc_mark_labels) | |
462 | return; | |
463 | if (S_GET_SEGMENT (label) != now_seg) | |
464 | return; | |
465 | if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) | |
466 | return; | |
7fd3924a AM |
467 | if (files_in_use == 0 && debug_type != DEBUG_DWARF2) |
468 | return; | |
469 | ||
470 | dwarf2_where (&loc); | |
07a53e5c RH |
471 | |
472 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
473 | ||
6a50d470 | 474 | dwarf2_gen_line_info_1 (label, &loc); |
7fd3924a | 475 | dwarf2_consume_line_info (); |
07a53e5c RH |
476 | } |
477 | ||
a7ed1ca2 NC |
478 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
479 | allocate it on that file table slot, otherwise return the first | |
480 | empty one. */ | |
220e750f RH |
481 | |
482 | static unsigned int | |
a2e22468 | 483 | get_filenum (const char *filename, unsigned int num) |
220e750f | 484 | { |
a7ed1ca2 NC |
485 | static unsigned int last_used, last_used_dir_len; |
486 | const char *file; | |
487 | size_t dir_len; | |
488 | unsigned int i, dir; | |
220e750f | 489 | |
a7ed1ca2 NC |
490 | if (num == 0 && last_used) |
491 | { | |
492 | if (! files[last_used].dir | |
8b6efd89 | 493 | && filename_cmp (filename, files[last_used].filename) == 0) |
a7ed1ca2 NC |
494 | return last_used; |
495 | if (files[last_used].dir | |
8b6efd89 KT |
496 | && filename_ncmp (filename, dirs[files[last_used].dir], |
497 | last_used_dir_len) == 0 | |
a7ed1ca2 | 498 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) |
8b6efd89 KT |
499 | && filename_cmp (filename + last_used_dir_len + 1, |
500 | files[last_used].filename) == 0) | |
a7ed1ca2 NC |
501 | return last_used; |
502 | } | |
220e750f | 503 | |
a7ed1ca2 NC |
504 | file = lbasename (filename); |
505 | /* Don't make empty string from / or A: from A:/ . */ | |
506 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
507 | if (file <= filename + 3) | |
508 | file = filename; | |
509 | #else | |
510 | if (file == filename + 1) | |
511 | file = filename; | |
512 | #endif | |
513 | dir_len = file - filename; | |
514 | ||
515 | dir = 0; | |
516 | if (dir_len) | |
517 | { | |
01e1a5bc | 518 | #ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR |
a7ed1ca2 | 519 | --dir_len; |
01e1a5bc | 520 | #endif |
a7ed1ca2 | 521 | for (dir = 1; dir < dirs_in_use; ++dir) |
8b6efd89 | 522 | if (filename_ncmp (filename, dirs[dir], dir_len) == 0 |
a7ed1ca2 NC |
523 | && dirs[dir][dir_len] == '\0') |
524 | break; | |
525 | ||
526 | if (dir >= dirs_in_use) | |
527 | { | |
528 | if (dir >= dirs_allocated) | |
529 | { | |
530 | dirs_allocated = dir + 32; | |
531 | dirs = (char **) | |
532 | xrealloc (dirs, (dir + 32) * sizeof (const char *)); | |
533 | } | |
534 | ||
1e9cc1c2 | 535 | dirs[dir] = (char *) xmalloc (dir_len + 1); |
a7ed1ca2 NC |
536 | memcpy (dirs[dir], filename, dir_len); |
537 | dirs[dir][dir_len] = '\0'; | |
538 | dirs_in_use = dir + 1; | |
539 | } | |
540 | } | |
541 | ||
542 | if (num == 0) | |
543 | { | |
544 | for (i = 1; i < files_in_use; ++i) | |
545 | if (files[i].dir == dir | |
88b4ca40 | 546 | && files[i].filename |
8b6efd89 | 547 | && filename_cmp (file, files[i].filename) == 0) |
a7ed1ca2 NC |
548 | { |
549 | last_used = i; | |
550 | last_used_dir_len = dir_len; | |
551 | return i; | |
552 | } | |
553 | } | |
554 | else | |
555 | i = num; | |
220e750f RH |
556 | |
557 | if (i >= files_allocated) | |
fac0d250 | 558 | { |
249e3833 RH |
559 | unsigned int old = files_allocated; |
560 | ||
220e750f RH |
561 | files_allocated = i + 32; |
562 | files = (struct file_entry *) | |
ee515fb7 | 563 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
249e3833 RH |
564 | |
565 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
566 | } |
567 | ||
a7ed1ca2 NC |
568 | files[i].filename = num ? file : xstrdup (file); |
569 | files[i].dir = dir; | |
10cd14b4 AM |
570 | if (files_in_use < i + 1) |
571 | files_in_use = i + 1; | |
220e750f | 572 | last_used = i; |
a7ed1ca2 | 573 | last_used_dir_len = dir_len; |
220e750f RH |
574 | |
575 | return i; | |
576 | } | |
fac0d250 | 577 | |
ecb4347a DJ |
578 | /* Handle two forms of .file directive: |
579 | - Pass .file "source.c" to s_app_file | |
580 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 581 | |
ecb4347a DJ |
582 | If an entry is added to the file table, return a pointer to the filename. */ |
583 | ||
584 | char * | |
a2e22468 | 585 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) |
220e750f RH |
586 | { |
587 | offsetT num; | |
e46d99eb | 588 | char *filename; |
220e750f RH |
589 | int filename_len; |
590 | ||
591 | /* Continue to accept a bare string and pass it off. */ | |
592 | SKIP_WHITESPACE (); | |
593 | if (*input_line_pointer == '"') | |
fac0d250 | 594 | { |
220e750f | 595 | s_app_file (0); |
ecb4347a | 596 | return NULL; |
fac0d250 RH |
597 | } |
598 | ||
220e750f RH |
599 | num = get_absolute_expression (); |
600 | filename = demand_copy_C_string (&filename_len); | |
bd0eb99b RH |
601 | if (filename == NULL) |
602 | return NULL; | |
220e750f RH |
603 | demand_empty_rest_of_line (); |
604 | ||
249e3833 | 605 | if (num < 1) |
fac0d250 | 606 | { |
0e389e77 | 607 | as_bad (_("file number less than one")); |
ecb4347a | 608 | return NULL; |
fac0d250 RH |
609 | } |
610 | ||
7cadeb2c AM |
611 | /* A .file directive implies compiler generated debug information is |
612 | being supplied. Turn off gas generated debug info. */ | |
613 | debug_type = DEBUG_NONE; | |
614 | ||
0e1a166b | 615 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 616 | { |
0e389e77 | 617 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 618 | return NULL; |
249e3833 | 619 | } |
220e750f | 620 | |
a7ed1ca2 | 621 | get_filenum (filename, num); |
ecb4347a DJ |
622 | |
623 | return filename; | |
fac0d250 RH |
624 | } |
625 | ||
220e750f | 626 | void |
a2e22468 | 627 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
220e750f | 628 | { |
ecea7679 RH |
629 | offsetT filenum, line; |
630 | ||
851feff8 DJ |
631 | /* If we see two .loc directives in a row, force the first one to be |
632 | output now. */ | |
7cadeb2c | 633 | if (dwarf2_loc_directive_seen) |
6a50d470 | 634 | dwarf2_emit_insn (0); |
851feff8 | 635 | |
ecea7679 RH |
636 | filenum = get_absolute_expression (); |
637 | SKIP_WHITESPACE (); | |
638 | line = get_absolute_expression (); | |
639 | ||
640 | if (filenum < 1) | |
641 | { | |
642 | as_bad (_("file number less than one")); | |
643 | return; | |
644 | } | |
645 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) | |
646 | { | |
647 | as_bad (_("unassigned file number %ld"), (long) filenum); | |
648 | return; | |
649 | } | |
650 | ||
651 | current.filenum = filenum; | |
652 | current.line = line; | |
92846e72 | 653 | current.discriminator = 0; |
ecea7679 RH |
654 | |
655 | #ifndef NO_LISTING | |
656 | if (listing) | |
657 | { | |
658 | if (files[filenum].dir) | |
659 | { | |
660 | size_t dir_len = strlen (dirs[files[filenum].dir]); | |
661 | size_t file_len = strlen (files[filenum].filename); | |
662 | char *cp = (char *) alloca (dir_len + 1 + file_len + 1); | |
663 | ||
664 | memcpy (cp, dirs[files[filenum].dir], dir_len); | |
56487c55 | 665 | INSERT_DIR_SEPARATOR (cp, dir_len); |
ecea7679 RH |
666 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
667 | cp[dir_len + file_len + 1] = '\0'; | |
668 | listing_source_file (cp); | |
669 | } | |
670 | else | |
671 | listing_source_file (files[filenum].filename); | |
672 | listing_source_line (line); | |
673 | } | |
674 | #endif | |
675 | ||
220e750f | 676 | SKIP_WHITESPACE (); |
ecea7679 RH |
677 | if (ISDIGIT (*input_line_pointer)) |
678 | { | |
679 | current.column = get_absolute_expression (); | |
680 | SKIP_WHITESPACE (); | |
681 | } | |
682 | ||
683 | while (ISALPHA (*input_line_pointer)) | |
220e750f | 684 | { |
bd0eb99b RH |
685 | char *p, c; |
686 | offsetT value; | |
687 | ||
688 | p = input_line_pointer; | |
689 | c = get_symbol_end (); | |
690 | ||
691 | if (strcmp (p, "basic_block") == 0) | |
692 | { | |
693 | current.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
694 | *input_line_pointer = c; | |
695 | } | |
696 | else if (strcmp (p, "prologue_end") == 0) | |
697 | { | |
698 | current.flags |= DWARF2_FLAG_PROLOGUE_END; | |
699 | *input_line_pointer = c; | |
700 | } | |
701 | else if (strcmp (p, "epilogue_begin") == 0) | |
702 | { | |
703 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN; | |
704 | *input_line_pointer = c; | |
705 | } | |
706 | else if (strcmp (p, "is_stmt") == 0) | |
707 | { | |
708 | *input_line_pointer = c; | |
709 | value = get_absolute_expression (); | |
710 | if (value == 0) | |
711 | current.flags &= ~DWARF2_FLAG_IS_STMT; | |
712 | else if (value == 1) | |
713 | current.flags |= DWARF2_FLAG_IS_STMT; | |
714 | else | |
ecea7679 RH |
715 | { |
716 | as_bad (_("is_stmt value not 0 or 1")); | |
717 | return; | |
718 | } | |
bd0eb99b RH |
719 | } |
720 | else if (strcmp (p, "isa") == 0) | |
721 | { | |
7fd3924a | 722 | *input_line_pointer = c; |
bd0eb99b | 723 | value = get_absolute_expression (); |
ecea7679 | 724 | if (value >= 0) |
bd0eb99b | 725 | current.isa = value; |
ecea7679 RH |
726 | else |
727 | { | |
728 | as_bad (_("isa number less than zero")); | |
729 | return; | |
730 | } | |
bd0eb99b | 731 | } |
92846e72 CC |
732 | else if (strcmp (p, "discriminator") == 0) |
733 | { | |
734 | *input_line_pointer = c; | |
735 | value = get_absolute_expression (); | |
736 | if (value >= 0) | |
737 | current.discriminator = value; | |
738 | else | |
739 | { | |
740 | as_bad (_("discriminator less than zero")); | |
741 | return; | |
742 | } | |
743 | } | |
bd0eb99b RH |
744 | else |
745 | { | |
ecea7679 | 746 | as_bad (_("unknown .loc sub-directive `%s'"), p); |
7fd3924a | 747 | *input_line_pointer = c; |
bd0eb99b RH |
748 | return; |
749 | } | |
750 | ||
ecea7679 | 751 | SKIP_WHITESPACE (); |
bd0eb99b RH |
752 | } |
753 | ||
754 | demand_empty_rest_of_line (); | |
1eee4adc | 755 | dwarf2_loc_directive_seen = TRUE; |
7cadeb2c | 756 | debug_type = DEBUG_NONE; |
220e750f | 757 | } |
07a53e5c RH |
758 | |
759 | void | |
760 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) | |
761 | { | |
762 | offsetT value = get_absolute_expression (); | |
763 | ||
764 | if (value != 0 && value != 1) | |
765 | { | |
766 | as_bad (_("expected 0 or 1")); | |
767 | ignore_rest_of_line (); | |
768 | } | |
769 | else | |
770 | { | |
771 | dwarf2_loc_mark_labels = value != 0; | |
772 | demand_empty_rest_of_line (); | |
773 | } | |
774 | } | |
220e750f RH |
775 | \f |
776 | static struct frag * | |
a2e22468 | 777 | first_frag_for_seg (segT seg) |
220e750f | 778 | { |
c9049d30 | 779 | return seg_info (seg)->frchainP->frch_root; |
220e750f RH |
780 | } |
781 | ||
782 | static struct frag * | |
a2e22468 | 783 | last_frag_for_seg (segT seg) |
220e750f | 784 | { |
c9049d30 | 785 | frchainS *f = seg_info (seg)->frchainP; |
220e750f | 786 | |
c9049d30 AM |
787 | while (f->frch_next != NULL) |
788 | f = f->frch_next; | |
220e750f | 789 | |
c9049d30 | 790 | return f->frch_last; |
220e750f RH |
791 | } |
792 | \f | |
793 | /* Emit a single byte into the current segment. */ | |
794 | ||
795 | static inline void | |
a2e22468 | 796 | out_byte (int byte) |
220e750f RH |
797 | { |
798 | FRAG_APPEND_1_CHAR (byte); | |
799 | } | |
800 | ||
801 | /* Emit a statement program opcode into the current segment. */ | |
802 | ||
803 | static inline void | |
a2e22468 | 804 | out_opcode (int opc) |
220e750f RH |
805 | { |
806 | out_byte (opc); | |
807 | } | |
808 | ||
809 | /* Emit a two-byte word into the current segment. */ | |
810 | ||
811 | static inline void | |
a2e22468 | 812 | out_two (int data) |
220e750f RH |
813 | { |
814 | md_number_to_chars (frag_more (2), data, 2); | |
815 | } | |
816 | ||
817 | /* Emit a four byte word into the current segment. */ | |
818 | ||
819 | static inline void | |
a2e22468 | 820 | out_four (int data) |
220e750f RH |
821 | { |
822 | md_number_to_chars (frag_more (4), data, 4); | |
823 | } | |
824 | ||
825 | /* Emit an unsigned "little-endian base 128" number. */ | |
826 | ||
fac0d250 | 827 | static void |
a2e22468 | 828 | out_uleb128 (addressT value) |
220e750f RH |
829 | { |
830 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
831 | } | |
832 | ||
92846e72 CC |
833 | /* Emit a signed "little-endian base 128" number. */ |
834 | ||
835 | static void | |
836 | out_leb128 (addressT value) | |
837 | { | |
838 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); | |
839 | } | |
840 | ||
220e750f RH |
841 | /* Emit a tuple for .debug_abbrev. */ |
842 | ||
843 | static inline void | |
a2e22468 | 844 | out_abbrev (int name, int form) |
fac0d250 | 845 | { |
220e750f RH |
846 | out_uleb128 (name); |
847 | out_uleb128 (form); | |
848 | } | |
fac0d250 | 849 | |
220e750f | 850 | /* Get the size of a fragment. */ |
fac0d250 | 851 | |
220e750f | 852 | static offsetT |
c9049d30 | 853 | get_frag_fix (fragS *frag, segT seg) |
220e750f RH |
854 | { |
855 | frchainS *fr; | |
856 | ||
857 | if (frag->fr_next) | |
858 | return frag->fr_fix; | |
859 | ||
860 | /* If a fragment is the last in the chain, special measures must be | |
861 | taken to find its size before relaxation, since it may be pending | |
862 | on some subsegment chain. */ | |
c9049d30 | 863 | for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) |
220e750f | 864 | if (fr->frch_last == frag) |
c5c0a210 | 865 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
220e750f RH |
866 | |
867 | abort (); | |
868 | } | |
fac0d250 | 869 | |
220e750f | 870 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 871 | |
220e750f | 872 | static void |
07a53e5c | 873 | out_set_addr (symbolS *sym) |
220e750f | 874 | { |
91d6fa6a | 875 | expressionS exp; |
9e3af0e7 | 876 | |
fac0d250 | 877 | out_opcode (DW_LNS_extended_op); |
220e750f | 878 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
879 | |
880 | out_opcode (DW_LNE_set_address); | |
91d6fa6a NC |
881 | exp.X_op = O_symbol; |
882 | exp.X_add_symbol = sym; | |
883 | exp.X_add_number = 0; | |
884 | emit_expr (&exp, sizeof_address); | |
fac0d250 RH |
885 | } |
886 | ||
a2e22468 | 887 | static void scale_addr_delta (addressT *); |
c8970b4b | 888 | |
a3b75434 | 889 | static void |
d7342424 | 890 | scale_addr_delta (addressT *addr_delta) |
a3b75434 DD |
891 | { |
892 | static int printed_this = 0; | |
8fbf7334 | 893 | if (DWARF2_LINE_MIN_INSN_LENGTH > 1) |
a3b75434 | 894 | { |
8fbf7334 JL |
895 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this) |
896 | { | |
897 | as_bad("unaligned opcodes detected in executable segment"); | |
898 | printed_this = 1; | |
899 | } | |
900 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
a3b75434 | 901 | } |
a3b75434 | 902 | } |
a3b75434 | 903 | |
220e750f RH |
904 | /* Encode a pair of line and address skips as efficiently as possible. |
905 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 906 | |
220e750f RH |
907 | The following two routines *must* be kept in sync. This is |
908 | enforced by making emit_inc_line_addr abort if we do not emit | |
909 | exactly the expected number of bytes. */ | |
910 | ||
911 | static int | |
a2e22468 | 912 | size_inc_line_addr (int line_delta, addressT addr_delta) |
fac0d250 | 913 | { |
220e750f RH |
914 | unsigned int tmp, opcode; |
915 | int len = 0; | |
fac0d250 | 916 | |
220e750f | 917 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 | 918 | scale_addr_delta (&addr_delta); |
220e750f RH |
919 | |
920 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
921 | We cannot use special opcodes here, since we want the end_sequence | |
922 | to emit the matrix entry. */ | |
923 | if (line_delta == INT_MAX) | |
fac0d250 | 924 | { |
220e750f RH |
925 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
926 | len = 1; | |
fac0d250 | 927 | else |
220e750f RH |
928 | len = 1 + sizeof_leb128 (addr_delta, 0); |
929 | return len + 3; | |
fac0d250 | 930 | } |
fac0d250 | 931 | |
220e750f RH |
932 | /* Bias the line delta by the base. */ |
933 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 934 | |
220e750f RH |
935 | /* If the line increment is out of range of a special opcode, we |
936 | must encode it with DW_LNS_advance_line. */ | |
937 | if (tmp >= DWARF2_LINE_RANGE) | |
938 | { | |
939 | len = 1 + sizeof_leb128 (line_delta, 1); | |
940 | line_delta = 0; | |
941 | tmp = 0 - DWARF2_LINE_BASE; | |
942 | } | |
fac0d250 | 943 | |
220e750f RH |
944 | /* Bias the opcode by the special opcode base. */ |
945 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 946 | |
220e750f RH |
947 | /* Avoid overflow when addr_delta is large. */ |
948 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
949 | { | |
950 | /* Try using a special opcode. */ | |
951 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
952 | if (opcode <= 255) | |
953 | return len + 1; | |
954 | ||
955 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
956 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
957 | if (opcode <= 255) | |
958 | return len + 2; | |
959 | } | |
960 | ||
961 | /* Otherwise use DW_LNS_advance_pc. */ | |
962 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
963 | ||
964 | /* DW_LNS_copy or special opcode. */ | |
965 | len += 1; | |
966 | ||
967 | return len; | |
968 | } | |
fac0d250 | 969 | |
220e750f | 970 | static void |
a2e22468 | 971 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
220e750f RH |
972 | { |
973 | unsigned int tmp, opcode; | |
974 | int need_copy = 0; | |
975 | char *end = p + len; | |
fac0d250 | 976 | |
07a53e5c RH |
977 | /* Line number sequences cannot go backward in addresses. This means |
978 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 979 | gas_assert ((offsetT) addr_delta >= 0); |
07a53e5c | 980 | |
220e750f | 981 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 DD |
982 | scale_addr_delta (&addr_delta); |
983 | ||
220e750f RH |
984 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
985 | We cannot use special opcodes here, since we want the end_sequence | |
986 | to emit the matrix entry. */ | |
987 | if (line_delta == INT_MAX) | |
fac0d250 | 988 | { |
220e750f RH |
989 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
990 | *p++ = DW_LNS_const_add_pc; | |
991 | else | |
fac0d250 | 992 | { |
220e750f RH |
993 | *p++ = DW_LNS_advance_pc; |
994 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 995 | } |
220e750f RH |
996 | |
997 | *p++ = DW_LNS_extended_op; | |
998 | *p++ = 1; | |
999 | *p++ = DW_LNE_end_sequence; | |
1000 | goto done; | |
fac0d250 RH |
1001 | } |
1002 | ||
220e750f RH |
1003 | /* Bias the line delta by the base. */ |
1004 | tmp = line_delta - DWARF2_LINE_BASE; | |
1005 | ||
1006 | /* If the line increment is out of range of a special opcode, we | |
1007 | must encode it with DW_LNS_advance_line. */ | |
1008 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 1009 | { |
220e750f RH |
1010 | *p++ = DW_LNS_advance_line; |
1011 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 1012 | |
220e750f RH |
1013 | line_delta = 0; |
1014 | tmp = 0 - DWARF2_LINE_BASE; | |
1015 | need_copy = 1; | |
1016 | } | |
fac0d250 | 1017 | |
bd0eb99b RH |
1018 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
1019 | special opcode. */ | |
1020 | if (line_delta == 0 && addr_delta == 0) | |
1021 | { | |
1022 | *p++ = DW_LNS_copy; | |
1023 | goto done; | |
1024 | } | |
1025 | ||
220e750f RH |
1026 | /* Bias the opcode by the special opcode base. */ |
1027 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 1028 | |
220e750f RH |
1029 | /* Avoid overflow when addr_delta is large. */ |
1030 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 1031 | { |
220e750f RH |
1032 | /* Try using a special opcode. */ |
1033 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
1034 | if (opcode <= 255) | |
1035 | { | |
1036 | *p++ = opcode; | |
1037 | goto done; | |
1038 | } | |
1039 | ||
1040 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
1041 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
1042 | if (opcode <= 255) | |
fac0d250 | 1043 | { |
220e750f RH |
1044 | *p++ = DW_LNS_const_add_pc; |
1045 | *p++ = opcode; | |
1046 | goto done; | |
fac0d250 RH |
1047 | } |
1048 | } | |
220e750f RH |
1049 | |
1050 | /* Otherwise use DW_LNS_advance_pc. */ | |
1051 | *p++ = DW_LNS_advance_pc; | |
1052 | p += output_leb128 (p, addr_delta, 0); | |
1053 | ||
1054 | if (need_copy) | |
1055 | *p++ = DW_LNS_copy; | |
fac0d250 | 1056 | else |
220e750f | 1057 | *p++ = tmp; |
fac0d250 | 1058 | |
220e750f | 1059 | done: |
9c2799c2 | 1060 | gas_assert (p == end); |
220e750f | 1061 | } |
a8316fe2 | 1062 | |
220e750f | 1063 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 1064 | |
220e750f | 1065 | static void |
a2e22468 | 1066 | out_inc_line_addr (int line_delta, addressT addr_delta) |
220e750f RH |
1067 | { |
1068 | int len = size_inc_line_addr (line_delta, addr_delta); | |
1069 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
1070 | } | |
9de8d8f1 | 1071 | |
1737851b BW |
1072 | /* Write out an alternative form of line and address skips using |
1073 | DW_LNS_fixed_advance_pc opcodes. This uses more space than the default | |
7ddd14de BW |
1074 | line and address information, but it is required if linker relaxation |
1075 | could change the code offsets. The following two routines *must* be | |
1076 | kept in sync. */ | |
453dc3f0 | 1077 | #define ADDR_DELTA_LIMIT 50000 |
1737851b | 1078 | |
7ddd14de BW |
1079 | static int |
1080 | size_fixed_inc_line_addr (int line_delta, addressT addr_delta) | |
1737851b | 1081 | { |
7ddd14de | 1082 | int len = 0; |
1737851b BW |
1083 | |
1084 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ | |
7ddd14de BW |
1085 | if (line_delta != INT_MAX) |
1086 | len = 1 + sizeof_leb128 (line_delta, 1); | |
1087 | ||
453dc3f0 | 1088 | if (addr_delta > ADDR_DELTA_LIMIT) |
7ddd14de BW |
1089 | { |
1090 | /* DW_LNS_extended_op */ | |
1091 | len += 1 + sizeof_leb128 (sizeof_address + 1, 0); | |
1092 | /* DW_LNE_set_address */ | |
1093 | len += 1 + sizeof_address; | |
1094 | } | |
1095 | else | |
1096 | /* DW_LNS_fixed_advance_pc */ | |
1097 | len += 3; | |
1098 | ||
1737851b | 1099 | if (line_delta == INT_MAX) |
7ddd14de BW |
1100 | /* DW_LNS_extended_op + DW_LNE_end_sequence */ |
1101 | len += 3; | |
1102 | else | |
1103 | /* DW_LNS_copy */ | |
1104 | len += 1; | |
1105 | ||
1106 | return len; | |
1107 | } | |
1108 | ||
1109 | static void | |
1110 | emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, | |
1111 | char *p, int len) | |
1112 | { | |
91d6fa6a | 1113 | expressionS *pexp; |
7ddd14de BW |
1114 | char *end = p + len; |
1115 | ||
1116 | /* Line number sequences cannot go backward in addresses. This means | |
1117 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 1118 | gas_assert ((offsetT) addr_delta >= 0); |
7ddd14de | 1119 | |
b40bf0a2 NC |
1120 | /* Verify that we have kept in sync with size_fixed_inc_line_addr. */ |
1121 | gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta)); | |
1122 | ||
7ddd14de BW |
1123 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
1124 | if (line_delta != INT_MAX) | |
1125 | { | |
1126 | *p++ = DW_LNS_advance_line; | |
1127 | p += output_leb128 (p, line_delta, 1); | |
1128 | } | |
1129 | ||
91d6fa6a | 1130 | pexp = symbol_get_value_expression (frag->fr_symbol); |
7ddd14de BW |
1131 | |
1132 | /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can | |
1133 | advance the address by at most 64K. Linker relaxation (without | |
1134 | which this function would not be used) could change the operand by | |
1135 | an unknown amount. If the address increment is getting close to | |
1136 | the limit, just reset the address. */ | |
453dc3f0 | 1137 | if (addr_delta > ADDR_DELTA_LIMIT) |
1737851b | 1138 | { |
7ddd14de | 1139 | symbolS *to_sym; |
91d6fa6a | 1140 | expressionS exp; |
7ddd14de | 1141 | |
9f6db0d3 | 1142 | gas_assert (pexp->X_op == O_subtract); |
91d6fa6a | 1143 | to_sym = pexp->X_add_symbol; |
7ddd14de BW |
1144 | |
1145 | *p++ = DW_LNS_extended_op; | |
1146 | p += output_leb128 (p, sizeof_address + 1, 0); | |
1147 | *p++ = DW_LNE_set_address; | |
91d6fa6a NC |
1148 | exp.X_op = O_symbol; |
1149 | exp.X_add_symbol = to_sym; | |
1150 | exp.X_add_number = 0; | |
62ebcb5c | 1151 | emit_expr_fix (&exp, sizeof_address, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de BW |
1152 | p += sizeof_address; |
1153 | } | |
1154 | else | |
1155 | { | |
1156 | *p++ = DW_LNS_fixed_advance_pc; | |
62ebcb5c | 1157 | emit_expr_fix (pexp, 2, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de | 1158 | p += 2; |
1737851b BW |
1159 | } |
1160 | ||
7ddd14de BW |
1161 | if (line_delta == INT_MAX) |
1162 | { | |
1163 | *p++ = DW_LNS_extended_op; | |
1164 | *p++ = 1; | |
1165 | *p++ = DW_LNE_end_sequence; | |
1166 | } | |
1167 | else | |
1168 | *p++ = DW_LNS_copy; | |
1737851b | 1169 | |
9c2799c2 | 1170 | gas_assert (p == end); |
1737851b BW |
1171 | } |
1172 | ||
220e750f RH |
1173 | /* Generate a variant frag that we can use to relax address/line |
1174 | increments between fragments of the target segment. */ | |
9e3af0e7 | 1175 | |
220e750f | 1176 | static void |
07a53e5c | 1177 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
220e750f | 1178 | { |
91d6fa6a | 1179 | expressionS exp; |
220e750f | 1180 | int max_chars; |
6576f0b5 | 1181 | |
91d6fa6a NC |
1182 | exp.X_op = O_subtract; |
1183 | exp.X_add_symbol = to_sym; | |
1184 | exp.X_op_symbol = from_sym; | |
1185 | exp.X_add_number = 0; | |
fac0d250 | 1186 | |
220e750f RH |
1187 | /* The maximum size of the frag is the line delta with a maximum |
1188 | sized address delta. */ | |
7ddd14de BW |
1189 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1190 | max_chars = size_fixed_inc_line_addr (line_delta, | |
1191 | -DWARF2_LINE_MIN_INSN_LENGTH); | |
1192 | else | |
1193 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 1194 | |
220e750f | 1195 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
91d6fa6a | 1196 | make_expr_symbol (&exp), line_delta, NULL); |
220e750f | 1197 | } |
fac0d250 | 1198 | |
220e750f RH |
1199 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
1200 | based on the current values of the symbols. It is called before | |
1201 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 1202 | |
220e750f | 1203 | int |
a2e22468 | 1204 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
220e750f RH |
1205 | { |
1206 | offsetT addr_delta; | |
1207 | int size; | |
fac0d250 | 1208 | |
6386f3a7 | 1209 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
7ddd14de BW |
1210 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1211 | size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); | |
1212 | else | |
1213 | size = size_inc_line_addr (frag->fr_offset, addr_delta); | |
fac0d250 | 1214 | |
220e750f | 1215 | frag->fr_subtype = size; |
fac0d250 | 1216 | |
220e750f RH |
1217 | return size; |
1218 | } | |
1219 | ||
1220 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
1221 | current values of the symbols. fr_subtype is the current length | |
1222 | of the frag. This returns the change in frag length. */ | |
1223 | ||
1224 | int | |
a2e22468 | 1225 | dwarf2dbg_relax_frag (fragS *frag) |
220e750f RH |
1226 | { |
1227 | int old_size, new_size; | |
fac0d250 | 1228 | |
220e750f RH |
1229 | old_size = frag->fr_subtype; |
1230 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 1231 | |
220e750f | 1232 | return new_size - old_size; |
fac0d250 RH |
1233 | } |
1234 | ||
220e750f RH |
1235 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
1236 | fill frag. This is called after all relaxation has been done. | |
1237 | fr_subtype will be the desired length of the frag. */ | |
1238 | ||
1239 | void | |
a2e22468 | 1240 | dwarf2dbg_convert_frag (fragS *frag) |
fac0d250 | 1241 | { |
220e750f RH |
1242 | offsetT addr_diff; |
1243 | ||
453dc3f0 NC |
1244 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1245 | { | |
1246 | /* If linker relaxation is enabled then the distance bewteen the two | |
1247 | symbols in the frag->fr_symbol expression might change. Hence we | |
1248 | cannot rely upon the value computed by resolve_symbol_value. | |
1249 | Instead we leave the expression unfinalized and allow | |
1250 | emit_fixed_inc_line_addr to create a fixup (which later becomes a | |
1251 | relocation) that will allow the linker to correctly compute the | |
1252 | actual address difference. We have to use a fixed line advance for | |
1253 | this as we cannot (easily) relocate leb128 encoded values. */ | |
1254 | int saved_finalize_syms = finalize_syms; | |
1255 | ||
1256 | finalize_syms = 0; | |
1257 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
1258 | finalize_syms = saved_finalize_syms; | |
1259 | } | |
1260 | else | |
1261 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
fac0d250 | 1262 | |
220e750f RH |
1263 | /* fr_var carries the max_chars that we created the fragment with. |
1264 | fr_subtype carries the current expected length. We must, of | |
1265 | course, have allocated enough memory earlier. */ | |
9c2799c2 | 1266 | gas_assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 1267 | |
7ddd14de BW |
1268 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1269 | emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, | |
1270 | frag->fr_literal + frag->fr_fix, | |
1271 | frag->fr_subtype); | |
1272 | else | |
1273 | emit_inc_line_addr (frag->fr_offset, addr_diff, | |
1274 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); | |
220e750f RH |
1275 | |
1276 | frag->fr_fix += frag->fr_subtype; | |
1277 | frag->fr_type = rs_fill; | |
1278 | frag->fr_var = 0; | |
1279 | frag->fr_offset = 0; | |
1280 | } | |
1281 | ||
1282 | /* Generate .debug_line content for the chain of line number entries | |
1283 | beginning at E, for segment SEG. */ | |
1284 | ||
1285 | static void | |
a2e22468 | 1286 | process_entries (segT seg, struct line_entry *e) |
220e750f RH |
1287 | { |
1288 | unsigned filenum = 1; | |
1289 | unsigned line = 1; | |
1290 | unsigned column = 0; | |
bd0eb99b RH |
1291 | unsigned isa = 0; |
1292 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; | |
07a53e5c RH |
1293 | fragS *last_frag = NULL, *frag; |
1294 | addressT last_frag_ofs = 0, frag_ofs; | |
fead5cd9 | 1295 | symbolS *last_lab = NULL, *lab; |
220e750f RH |
1296 | struct line_entry *next; |
1297 | ||
b40bf0a2 NC |
1298 | if (flag_dwarf_sections) |
1299 | { | |
1300 | char * name; | |
1301 | const char * sec_name; | |
1302 | ||
1303 | /* Switch to the relevent sub-section before we start to emit | |
1304 | the line number table. | |
1305 | ||
1306 | FIXME: These sub-sections do not have a normal Line Number | |
1307 | Program Header, thus strictly speaking they are not valid | |
1308 | DWARF sections. Unfortunately the DWARF standard assumes | |
1309 | a one-to-one relationship between compilation units and | |
1310 | line number tables. Thus we have to have a .debug_line | |
1311 | section, as well as our sub-sections, and we have to ensure | |
1312 | that all of the sub-sections are merged into a proper | |
1313 | .debug_line section before a debugger sees them. */ | |
1314 | ||
1315 | sec_name = bfd_get_section_name (stdoutput, seg); | |
1316 | if (strcmp (sec_name, ".text") != 0) | |
1317 | { | |
1318 | unsigned int len; | |
1319 | ||
1320 | len = strlen (sec_name); | |
1321 | name = xmalloc (len + 11 + 2); | |
1322 | sprintf (name, ".debug_line%s", sec_name); | |
1323 | subseg_set (subseg_get (name, FALSE), 0); | |
1324 | } | |
1325 | else | |
1326 | /* Don't create a .debug_line.text section - | |
1327 | that is redundant. Instead just switch back to the | |
1328 | normal .debug_line section. */ | |
1329 | subseg_set (subseg_get (".debug_line", FALSE), 0); | |
1330 | } | |
1331 | ||
fead5cd9 | 1332 | do |
fac0d250 | 1333 | { |
07a53e5c | 1334 | int line_delta; |
220e750f RH |
1335 | |
1336 | if (filenum != e->loc.filenum) | |
fac0d250 | 1337 | { |
220e750f RH |
1338 | filenum = e->loc.filenum; |
1339 | out_opcode (DW_LNS_set_file); | |
1340 | out_uleb128 (filenum); | |
220e750f RH |
1341 | } |
1342 | ||
1343 | if (column != e->loc.column) | |
1344 | { | |
1345 | column = e->loc.column; | |
1346 | out_opcode (DW_LNS_set_column); | |
1347 | out_uleb128 (column); | |
220e750f RH |
1348 | } |
1349 | ||
92846e72 CC |
1350 | if (e->loc.discriminator != 0) |
1351 | { | |
1352 | out_opcode (DW_LNS_extended_op); | |
1353 | out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); | |
1354 | out_opcode (DW_LNE_set_discriminator); | |
1355 | out_uleb128 (e->loc.discriminator); | |
1356 | } | |
1357 | ||
bd0eb99b RH |
1358 | if (isa != e->loc.isa) |
1359 | { | |
1360 | isa = e->loc.isa; | |
1361 | out_opcode (DW_LNS_set_isa); | |
1362 | out_uleb128 (isa); | |
bd0eb99b RH |
1363 | } |
1364 | ||
1365 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT) | |
220e750f RH |
1366 | { |
1367 | flags = e->loc.flags; | |
1368 | out_opcode (DW_LNS_negate_stmt); | |
220e750f RH |
1369 | } |
1370 | ||
bd0eb99b | 1371 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) |
07a53e5c | 1372 | out_opcode (DW_LNS_set_basic_block); |
220e750f | 1373 | |
bd0eb99b | 1374 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) |
07a53e5c | 1375 | out_opcode (DW_LNS_set_prologue_end); |
bd0eb99b RH |
1376 | |
1377 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) | |
07a53e5c | 1378 | out_opcode (DW_LNS_set_epilogue_begin); |
bd0eb99b | 1379 | |
fb81275c JM |
1380 | /* Don't try to optimize away redundant entries; gdb wants two |
1381 | entries for a function where the code starts on the same line as | |
1382 | the {, and there's no way to identify that case here. Trust gcc | |
1383 | to optimize appropriately. */ | |
07a53e5c RH |
1384 | line_delta = e->loc.line - line; |
1385 | lab = e->label; | |
1386 | frag = symbol_get_frag (lab); | |
1387 | frag_ofs = S_GET_VALUE (lab); | |
220e750f | 1388 | |
07a53e5c | 1389 | if (last_frag == NULL) |
220e750f | 1390 | { |
07a53e5c RH |
1391 | out_set_addr (lab); |
1392 | out_inc_line_addr (line_delta, 0); | |
220e750f | 1393 | } |
7ddd14de | 1394 | else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c RH |
1395 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
1396 | else | |
1397 | relax_inc_line_addr (line_delta, lab, last_lab); | |
1398 | ||
1399 | line = e->loc.line; | |
1400 | last_lab = lab; | |
1401 | last_frag = frag; | |
1402 | last_frag_ofs = frag_ofs; | |
220e750f RH |
1403 | |
1404 | next = e->next; | |
1405 | free (e); | |
1406 | e = next; | |
fac0d250 | 1407 | } |
fead5cd9 | 1408 | while (e); |
353e2c69 | 1409 | |
220e750f | 1410 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
07a53e5c | 1411 | frag = last_frag_for_seg (seg); |
c9049d30 | 1412 | frag_ofs = get_frag_fix (frag, seg); |
7ddd14de | 1413 | if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c | 1414 | out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); |
220e750f | 1415 | else |
07a53e5c RH |
1416 | { |
1417 | lab = symbol_temp_new (seg, frag_ofs, frag); | |
1418 | relax_inc_line_addr (INT_MAX, lab, last_lab); | |
1419 | } | |
fac0d250 RH |
1420 | } |
1421 | ||
220e750f RH |
1422 | /* Emit the directory and file tables for .debug_line. */ |
1423 | ||
fac0d250 | 1424 | static void |
a2e22468 | 1425 | out_file_list (void) |
fac0d250 RH |
1426 | { |
1427 | size_t size; | |
3d6b762c | 1428 | const char *dir; |
fac0d250 | 1429 | char *cp; |
220e750f RH |
1430 | unsigned int i; |
1431 | ||
a7ed1ca2 NC |
1432 | /* Emit directory list. */ |
1433 | for (i = 1; i < dirs_in_use; ++i) | |
1434 | { | |
3d6b762c JM |
1435 | dir = remap_debug_filename (dirs[i]); |
1436 | size = strlen (dir) + 1; | |
a7ed1ca2 | 1437 | cp = frag_more (size); |
3d6b762c | 1438 | memcpy (cp, dir, size); |
a7ed1ca2 NC |
1439 | } |
1440 | /* Terminate it. */ | |
220e750f | 1441 | out_byte ('\0'); |
fac0d250 | 1442 | |
220e750f | 1443 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 1444 | { |
01e1a5bc NC |
1445 | const char *fullfilename; |
1446 | ||
249e3833 RH |
1447 | if (files[i].filename == NULL) |
1448 | { | |
0e389e77 | 1449 | as_bad (_("unassigned file number %ld"), (long) i); |
88b4ca40 RH |
1450 | /* Prevent a crash later, particularly for file 1. */ |
1451 | files[i].filename = ""; | |
249e3833 RH |
1452 | continue; |
1453 | } | |
1454 | ||
01e1a5bc NC |
1455 | fullfilename = DWARF2_FILE_NAME (files[i].filename, |
1456 | files[i].dir ? dirs [files [i].dir] : ""); | |
1457 | size = strlen (fullfilename) + 1; | |
fac0d250 | 1458 | cp = frag_more (size); |
01e1a5bc | 1459 | memcpy (cp, fullfilename, size); |
fac0d250 | 1460 | |
220e750f | 1461 | out_uleb128 (files[i].dir); /* directory number */ |
01e1a5bc NC |
1462 | /* Output the last modification timestamp. */ |
1463 | out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, | |
1464 | files[i].dir ? dirs [files [i].dir] : "")); | |
1465 | /* Output the filesize. */ | |
1466 | out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, | |
1467 | files[i].dir ? dirs [files [i].dir] : "")); | |
fac0d250 | 1468 | } |
353e2c69 KH |
1469 | |
1470 | /* Terminate filename list. */ | |
1471 | out_byte (0); | |
fac0d250 RH |
1472 | } |
1473 | ||
413a266c AM |
1474 | /* Switch to SEC and output a header length field. Return the size of |
1475 | offsets used in SEC. The caller must set EXPR->X_add_symbol value | |
1476 | to the end of the section. */ | |
1477 | ||
1478 | static int | |
91d6fa6a | 1479 | out_header (asection *sec, expressionS *exp) |
413a266c AM |
1480 | { |
1481 | symbolS *start_sym; | |
1482 | symbolS *end_sym; | |
1483 | ||
1484 | subseg_set (sec, 0); | |
5bb3703f | 1485 | start_sym = symbol_temp_new_now (); |
413a266c AM |
1486 | end_sym = symbol_temp_make (); |
1487 | ||
1488 | /* Total length of the information. */ | |
91d6fa6a NC |
1489 | exp->X_op = O_subtract; |
1490 | exp->X_add_symbol = end_sym; | |
1491 | exp->X_op_symbol = start_sym; | |
413a266c AM |
1492 | |
1493 | switch (DWARF2_FORMAT (sec)) | |
1494 | { | |
1495 | case dwarf2_format_32bit: | |
91d6fa6a NC |
1496 | exp->X_add_number = -4; |
1497 | emit_expr (exp, 4); | |
413a266c AM |
1498 | return 4; |
1499 | ||
1500 | case dwarf2_format_64bit: | |
91d6fa6a | 1501 | exp->X_add_number = -12; |
413a266c | 1502 | out_four (-1); |
91d6fa6a | 1503 | emit_expr (exp, 8); |
413a266c AM |
1504 | return 8; |
1505 | ||
1506 | case dwarf2_format_64bit_irix: | |
91d6fa6a NC |
1507 | exp->X_add_number = -8; |
1508 | emit_expr (exp, 8); | |
413a266c AM |
1509 | return 8; |
1510 | } | |
1511 | ||
1512 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
220e750f RH |
1516 | /* Emit the collected .debug_line data. */ |
1517 | ||
1518 | static void | |
a2e22468 | 1519 | out_debug_line (segT line_seg) |
220e750f | 1520 | { |
91d6fa6a | 1521 | expressionS exp; |
02fe846e | 1522 | symbolS *prologue_start, *prologue_end; |
220e750f RH |
1523 | symbolS *line_end; |
1524 | struct line_seg *s; | |
14e777e0 | 1525 | int sizeof_offset; |
220e750f | 1526 | |
91d6fa6a NC |
1527 | sizeof_offset = out_header (line_seg, &exp); |
1528 | line_end = exp.X_add_symbol; | |
220e750f RH |
1529 | |
1530 | /* Version. */ | |
88ebb0a1 | 1531 | out_two (DWARF2_LINE_VERSION); |
220e750f RH |
1532 | |
1533 | /* Length of the prologue following this length. */ | |
02fe846e | 1534 | prologue_start = symbol_temp_make (); |
413a266c | 1535 | prologue_end = symbol_temp_make (); |
02fe846e | 1536 | exp.X_op = O_subtract; |
91d6fa6a | 1537 | exp.X_add_symbol = prologue_end; |
02fe846e AM |
1538 | exp.X_op_symbol = prologue_start; |
1539 | exp.X_add_number = 0; | |
91d6fa6a | 1540 | emit_expr (&exp, sizeof_offset); |
02fe846e | 1541 | symbol_set_value_now (prologue_start); |
220e750f RH |
1542 | |
1543 | /* Parameters of the state machine. */ | |
1544 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1545 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1546 | out_byte (DWARF2_LINE_BASE); | |
1547 | out_byte (DWARF2_LINE_RANGE); | |
1548 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1549 | ||
1550 | /* Standard opcode lengths. */ | |
1551 | out_byte (0); /* DW_LNS_copy */ | |
1552 | out_byte (1); /* DW_LNS_advance_pc */ | |
1553 | out_byte (1); /* DW_LNS_advance_line */ | |
1554 | out_byte (1); /* DW_LNS_set_file */ | |
1555 | out_byte (1); /* DW_LNS_set_column */ | |
1556 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1557 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1558 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1559 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
bd0eb99b RH |
1560 | out_byte (0); /* DW_LNS_set_prologue_end */ |
1561 | out_byte (0); /* DW_LNS_set_epilogue_begin */ | |
1562 | out_byte (1); /* DW_LNS_set_isa */ | |
220e750f RH |
1563 | |
1564 | out_file_list (); | |
1565 | ||
b7d6ed97 | 1566 | symbol_set_value_now (prologue_end); |
220e750f RH |
1567 | |
1568 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1569 | for (s = all_segs; s; s = s->next) |
9aec2026 NC |
1570 | if (SEG_NORMAL (s->seg)) |
1571 | process_entries (s->seg, s->head->head); | |
1572 | else | |
1573 | as_warn ("dwarf line number information for %s ignored", | |
1574 | segment_name (s->seg)); | |
220e750f | 1575 | |
b40bf0a2 NC |
1576 | if (flag_dwarf_sections) |
1577 | /* We have to switch to the special .debug_line_end section | |
1578 | before emitting the end-of-debug_line symbol. The linker | |
1579 | script arranges for this section to be placed after all the | |
1580 | (potentially garbage collected) .debug_line.<foo> sections. | |
1581 | This section contains the line_end symbol which is used to | |
1582 | compute the size of the linked .debug_line section, as seen | |
1583 | in the DWARF Line Number header. */ | |
1584 | subseg_set (subseg_get (".debug_line_end", FALSE), 0); | |
1585 | ||
b7d6ed97 | 1586 | symbol_set_value_now (line_end); |
220e750f RH |
1587 | } |
1588 | ||
802f5d9e NC |
1589 | static void |
1590 | out_debug_ranges (segT ranges_seg) | |
1591 | { | |
1592 | unsigned int addr_size = sizeof_address; | |
1593 | struct line_seg *s; | |
91d6fa6a | 1594 | expressionS exp; |
802f5d9e NC |
1595 | unsigned int i; |
1596 | ||
1597 | subseg_set (ranges_seg, 0); | |
1598 | ||
1599 | /* Base Address Entry. */ | |
7fd3924a | 1600 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1601 | out_byte (0xff); |
7fd3924a | 1602 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1603 | out_byte (0); |
1604 | ||
1605 | /* Range List Entry. */ | |
1606 | for (s = all_segs; s; s = s->next) | |
1607 | { | |
1608 | fragS *frag; | |
1609 | symbolS *beg, *end; | |
1610 | ||
1611 | frag = first_frag_for_seg (s->seg); | |
1612 | beg = symbol_temp_new (s->seg, 0, frag); | |
1613 | s->text_start = beg; | |
1614 | ||
1615 | frag = last_frag_for_seg (s->seg); | |
1616 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); | |
1617 | s->text_end = end; | |
1618 | ||
91d6fa6a NC |
1619 | exp.X_op = O_symbol; |
1620 | exp.X_add_symbol = beg; | |
1621 | exp.X_add_number = 0; | |
1622 | emit_expr (&exp, addr_size); | |
802f5d9e | 1623 | |
91d6fa6a NC |
1624 | exp.X_op = O_symbol; |
1625 | exp.X_add_symbol = end; | |
1626 | exp.X_add_number = 0; | |
1627 | emit_expr (&exp, addr_size); | |
802f5d9e NC |
1628 | } |
1629 | ||
1630 | /* End of Range Entry. */ | |
7fd3924a | 1631 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1632 | out_byte (0); |
7fd3924a | 1633 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1634 | out_byte (0); |
1635 | } | |
1636 | ||
220e750f RH |
1637 | /* Emit data for .debug_aranges. */ |
1638 | ||
58b5739a | 1639 | static void |
a2e22468 | 1640 | out_debug_aranges (segT aranges_seg, segT info_seg) |
fac0d250 | 1641 | { |
220e750f | 1642 | unsigned int addr_size = sizeof_address; |
220e750f | 1643 | struct line_seg *s; |
91d6fa6a | 1644 | expressionS exp; |
413a266c | 1645 | symbolS *aranges_end; |
220e750f | 1646 | char *p; |
413a266c | 1647 | int sizeof_offset; |
fac0d250 | 1648 | |
91d6fa6a NC |
1649 | sizeof_offset = out_header (aranges_seg, &exp); |
1650 | aranges_end = exp.X_add_symbol; | |
fac0d250 | 1651 | |
220e750f | 1652 | /* Version. */ |
88ebb0a1 | 1653 | out_two (DWARF2_ARANGES_VERSION); |
4dc7ead9 | 1654 | |
220e750f | 1655 | /* Offset to .debug_info. */ |
413a266c | 1656 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); |
220e750f RH |
1657 | |
1658 | /* Size of an address (offset portion). */ | |
1659 | out_byte (addr_size); | |
1660 | ||
1661 | /* Size of a segment descriptor. */ | |
1662 | out_byte (0); | |
1663 | ||
1664 | /* Align the header. */ | |
413a266c | 1665 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
4dc7ead9 | 1666 | |
ee515fb7 | 1667 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1668 | { |
1669 | fragS *frag; | |
1670 | symbolS *beg, *end; | |
1671 | ||
1672 | frag = first_frag_for_seg (s->seg); | |
b7d6ed97 | 1673 | beg = symbol_temp_new (s->seg, 0, frag); |
220e750f RH |
1674 | s->text_start = beg; |
1675 | ||
1676 | frag = last_frag_for_seg (s->seg); | |
c9049d30 | 1677 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
220e750f RH |
1678 | s->text_end = end; |
1679 | ||
91d6fa6a NC |
1680 | exp.X_op = O_symbol; |
1681 | exp.X_add_symbol = beg; | |
1682 | exp.X_add_number = 0; | |
1683 | emit_expr (&exp, addr_size); | |
220e750f | 1684 | |
91d6fa6a NC |
1685 | exp.X_op = O_subtract; |
1686 | exp.X_add_symbol = end; | |
1687 | exp.X_op_symbol = beg; | |
1688 | exp.X_add_number = 0; | |
1689 | emit_expr (&exp, addr_size); | |
220e750f | 1690 | } |
4dc7ead9 | 1691 | |
220e750f RH |
1692 | p = frag_more (2 * addr_size); |
1693 | md_number_to_chars (p, 0, addr_size); | |
1694 | md_number_to_chars (p + addr_size, 0, addr_size); | |
413a266c AM |
1695 | |
1696 | symbol_set_value_now (aranges_end); | |
4dc7ead9 RH |
1697 | } |
1698 | ||
220e750f RH |
1699 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1700 | sync with out_debug_info below. */ | |
fac0d250 | 1701 | |
220e750f | 1702 | static void |
413a266c AM |
1703 | out_debug_abbrev (segT abbrev_seg, |
1704 | segT info_seg ATTRIBUTE_UNUSED, | |
1705 | segT line_seg ATTRIBUTE_UNUSED) | |
220e750f RH |
1706 | { |
1707 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1708 | |
220e750f RH |
1709 | out_uleb128 (1); |
1710 | out_uleb128 (DW_TAG_compile_unit); | |
1711 | out_byte (DW_CHILDREN_no); | |
413a266c AM |
1712 | if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) |
1713 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1714 | else | |
1715 | out_abbrev (DW_AT_stmt_list, DW_FORM_data8); | |
220e750f | 1716 | if (all_segs->next == NULL) |
4dc7ead9 | 1717 | { |
220e750f | 1718 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
88ebb0a1 MW |
1719 | if (DWARF2_VERSION < 4) |
1720 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1721 | else | |
1722 | out_abbrev (DW_AT_high_pc, (sizeof_address == 4 | |
1723 | ? DW_FORM_data4 : DW_FORM_data8)); | |
220e750f | 1724 | } |
802f5d9e NC |
1725 | else |
1726 | { | |
413a266c | 1727 | if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) |
802f5d9e NC |
1728 | out_abbrev (DW_AT_ranges, DW_FORM_data4); |
1729 | else | |
1730 | out_abbrev (DW_AT_ranges, DW_FORM_data8); | |
1731 | } | |
48b91938 | 1732 | out_abbrev (DW_AT_name, DW_FORM_string); |
220e750f RH |
1733 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
1734 | out_abbrev (DW_AT_producer, DW_FORM_string); | |
1735 | out_abbrev (DW_AT_language, DW_FORM_data2); | |
1736 | out_abbrev (0, 0); | |
a987bfc9 RH |
1737 | |
1738 | /* Terminate the abbreviations for this compilation unit. */ | |
1739 | out_byte (0); | |
220e750f | 1740 | } |
4dc7ead9 | 1741 | |
220e750f | 1742 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 1743 | |
220e750f | 1744 | static void |
802f5d9e | 1745 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) |
220e750f RH |
1746 | { |
1747 | char producer[128]; | |
3d6b762c JM |
1748 | const char *comp_dir; |
1749 | const char *dirname; | |
91d6fa6a | 1750 | expressionS exp; |
220e750f RH |
1751 | symbolS *info_end; |
1752 | char *p; | |
1753 | int len; | |
14e777e0 | 1754 | int sizeof_offset; |
4dc7ead9 | 1755 | |
91d6fa6a NC |
1756 | sizeof_offset = out_header (info_seg, &exp); |
1757 | info_end = exp.X_add_symbol; | |
4dc7ead9 | 1758 | |
220e750f | 1759 | /* DWARF version. */ |
fc0eebac | 1760 | out_two (DWARF2_VERSION); |
4dc7ead9 | 1761 | |
220e750f | 1762 | /* .debug_abbrev offset */ |
6174d9c8 | 1763 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
4dc7ead9 | 1764 | |
220e750f RH |
1765 | /* Target address size. */ |
1766 | out_byte (sizeof_address); | |
fac0d250 | 1767 | |
220e750f RH |
1768 | /* DW_TAG_compile_unit DIE abbrev */ |
1769 | out_uleb128 (1); | |
fac0d250 | 1770 | |
220e750f | 1771 | /* DW_AT_stmt_list */ |
413a266c AM |
1772 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), |
1773 | (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit | |
1774 | ? 4 : 8)); | |
fac0d250 | 1775 | |
802f5d9e | 1776 | /* These two attributes are emitted if all of the code is contiguous. */ |
220e750f | 1777 | if (all_segs->next == NULL) |
58b5739a | 1778 | { |
220e750f | 1779 | /* DW_AT_low_pc */ |
91d6fa6a NC |
1780 | exp.X_op = O_symbol; |
1781 | exp.X_add_symbol = all_segs->text_start; | |
1782 | exp.X_add_number = 0; | |
1783 | emit_expr (&exp, sizeof_address); | |
220e750f RH |
1784 | |
1785 | /* DW_AT_high_pc */ | |
88ebb0a1 MW |
1786 | if (DWARF2_VERSION < 4) |
1787 | exp.X_op = O_symbol; | |
1788 | else | |
1789 | { | |
1790 | exp.X_op = O_subtract; | |
1791 | exp.X_op_symbol = all_segs->text_start; | |
1792 | } | |
91d6fa6a NC |
1793 | exp.X_add_symbol = all_segs->text_end; |
1794 | exp.X_add_number = 0; | |
1795 | emit_expr (&exp, sizeof_address); | |
58b5739a | 1796 | } |
802f5d9e NC |
1797 | else |
1798 | { | |
eb1fe072 NC |
1799 | /* This attribute is emitted if the code is disjoint. */ |
1800 | /* DW_AT_ranges. */ | |
1801 | TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); | |
802f5d9e | 1802 | } |
58b5739a | 1803 | |
48b91938 RH |
1804 | /* DW_AT_name. We don't have the actual file name that was present |
1805 | on the command line, so assume files[1] is the main input file. | |
1806 | We're not supposed to get called unless at least one line number | |
1807 | entry was emitted, so this should always be defined. */ | |
7fd3924a | 1808 | if (files_in_use == 0) |
48b91938 | 1809 | abort (); |
a7ed1ca2 NC |
1810 | if (files[1].dir) |
1811 | { | |
3d6b762c JM |
1812 | dirname = remap_debug_filename (dirs[files[1].dir]); |
1813 | len = strlen (dirname); | |
198f1251 TG |
1814 | #ifdef TE_VMS |
1815 | /* Already has trailing slash. */ | |
1816 | p = frag_more (len); | |
1817 | memcpy (p, dirname, len); | |
1818 | #else | |
a7ed1ca2 | 1819 | p = frag_more (len + 1); |
3d6b762c | 1820 | memcpy (p, dirname, len); |
56487c55 | 1821 | INSERT_DIR_SEPARATOR (p, len); |
198f1251 | 1822 | #endif |
a7ed1ca2 | 1823 | } |
48b91938 RH |
1824 | len = strlen (files[1].filename) + 1; |
1825 | p = frag_more (len); | |
1826 | memcpy (p, files[1].filename, len); | |
1827 | ||
220e750f | 1828 | /* DW_AT_comp_dir */ |
3d6b762c | 1829 | comp_dir = remap_debug_filename (getpwd ()); |
220e750f RH |
1830 | len = strlen (comp_dir) + 1; |
1831 | p = frag_more (len); | |
1832 | memcpy (p, comp_dir, len); | |
fac0d250 | 1833 | |
220e750f RH |
1834 | /* DW_AT_producer */ |
1835 | sprintf (producer, "GNU AS %s", VERSION); | |
1836 | len = strlen (producer) + 1; | |
1837 | p = frag_more (len); | |
1838 | memcpy (p, producer, len); | |
fac0d250 | 1839 | |
220e750f RH |
1840 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
1841 | dwarf2 draft has no standard code for assembler. */ | |
1842 | out_two (DW_LANG_Mips_Assembler); | |
1843 | ||
b7d6ed97 | 1844 | symbol_set_value_now (info_end); |
fac0d250 RH |
1845 | } |
1846 | ||
1e9cc1c2 NC |
1847 | void |
1848 | dwarf2_init (void) | |
1849 | { | |
1850 | all_segs_hash = hash_new (); | |
1851 | last_seg_ptr = &all_segs; | |
1852 | } | |
1853 | ||
1854 | ||
c6cb92c5 NS |
1855 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
1856 | were any .file/.loc directives, or --gdwarf2 was given, or if the | |
df1c40a7 L |
1857 | file has a non-empty .debug_info section and an empty .debug_line |
1858 | section. If we emit .debug_line, and the .debug_info section is | |
1859 | empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. | |
1860 | ALL_SEGS will be non-null if there were any .file/.loc directives, | |
1861 | or --gdwarf2 was given and there were any located instructions | |
1862 | emitted. */ | |
c6cb92c5 | 1863 | |
fac0d250 | 1864 | void |
a2e22468 | 1865 | dwarf2_finish (void) |
fac0d250 | 1866 | { |
220e750f RH |
1867 | segT line_seg; |
1868 | struct line_seg *s; | |
c6cb92c5 NS |
1869 | segT info_seg; |
1870 | int emit_other_sections = 0; | |
df1c40a7 | 1871 | int empty_debug_line = 0; |
c6cb92c5 NS |
1872 | |
1873 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); | |
1874 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); | |
fac0d250 | 1875 | |
df1c40a7 L |
1876 | line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); |
1877 | empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); | |
1878 | ||
1879 | /* We can't construct a new debug_line section if we already have one. | |
1880 | Give an error. */ | |
1881 | if (all_segs && !empty_debug_line) | |
1882 | as_fatal ("duplicate .debug_line sections"); | |
1883 | ||
1884 | if ((!all_segs && emit_other_sections) | |
1885 | || (!emit_other_sections && !empty_debug_line)) | |
1886 | /* If there is no line information and no non-empty .debug_info | |
1887 | section, or if there is both a non-empty .debug_info and a non-empty | |
1888 | .debug_line, then we do nothing. */ | |
220e750f | 1889 | return; |
fac0d250 | 1890 | |
220e750f | 1891 | /* Calculate the size of an address for the target machine. */ |
9605f328 | 1892 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
fac0d250 | 1893 | |
220e750f RH |
1894 | /* Create and switch to the line number section. */ |
1895 | line_seg = subseg_new (".debug_line", 0); | |
8a7140c3 | 1896 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
fac0d250 | 1897 | |
220e750f | 1898 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 1899 | for (s = all_segs; s; s = s->next) |
fac0d250 | 1900 | { |
91d6fa6a NC |
1901 | struct line_subseg *lss = s->head; |
1902 | struct line_entry **ptail = lss->ptail; | |
220e750f | 1903 | |
91d6fa6a | 1904 | while ((lss = lss->next) != NULL) |
220e750f | 1905 | { |
91d6fa6a NC |
1906 | *ptail = lss->head; |
1907 | ptail = lss->ptail; | |
220e750f | 1908 | } |
fac0d250 | 1909 | } |
85a39694 | 1910 | |
220e750f | 1911 | out_debug_line (line_seg); |
85a39694 | 1912 | |
c6cb92c5 NS |
1913 | /* If this is assembler generated line info, and there is no |
1914 | debug_info already, we need .debug_info and .debug_abbrev | |
1915 | sections as well. */ | |
1916 | if (emit_other_sections) | |
220e750f RH |
1917 | { |
1918 | segT abbrev_seg; | |
220e750f | 1919 | segT aranges_seg; |
802f5d9e | 1920 | segT ranges_seg; |
4dc7ead9 | 1921 | |
9c2799c2 | 1922 | gas_assert (all_segs); |
7fd3924a | 1923 | |
220e750f RH |
1924 | info_seg = subseg_new (".debug_info", 0); |
1925 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
1926 | aranges_seg = subseg_new (".debug_aranges", 0); | |
ef99799a | 1927 | |
8a7140c3 NC |
1928 | bfd_set_section_flags (stdoutput, info_seg, |
1929 | SEC_READONLY | SEC_DEBUGGING); | |
1930 | bfd_set_section_flags (stdoutput, abbrev_seg, | |
1931 | SEC_READONLY | SEC_DEBUGGING); | |
1932 | bfd_set_section_flags (stdoutput, aranges_seg, | |
1933 | SEC_READONLY | SEC_DEBUGGING); | |
ef99799a | 1934 | |
ee515fb7 | 1935 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 1936 | |
802f5d9e NC |
1937 | if (all_segs->next == NULL) |
1938 | ranges_seg = NULL; | |
1939 | else | |
1940 | { | |
1941 | ranges_seg = subseg_new (".debug_ranges", 0); | |
7fd3924a | 1942 | bfd_set_section_flags (stdoutput, ranges_seg, |
802f5d9e NC |
1943 | SEC_READONLY | SEC_DEBUGGING); |
1944 | record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); | |
1945 | out_debug_ranges (ranges_seg); | |
1946 | } | |
1947 | ||
220e750f | 1948 | out_debug_aranges (aranges_seg, info_seg); |
413a266c | 1949 | out_debug_abbrev (abbrev_seg, info_seg, line_seg); |
802f5d9e | 1950 | out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg); |
220e750f | 1951 | } |
85a39694 | 1952 | } |