Commit | Line | Data |
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fac0d250 | 1 | /* dwarf2dbg.c - DWARF2 debug support |
219d1afa | 2 | Copyright (C) 1999-2018 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 | ||
33eaf5de | 124 | /* First special line opcode - leave room for the standard opcodes. |
fac0d250 RH |
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 | ||
ba8826a8 AO |
165 | struct line_entry |
166 | { | |
220e750f | 167 | struct line_entry *next; |
07a53e5c | 168 | symbolS *label; |
220e750f | 169 | struct dwarf2_line_info loc; |
e6c774b4 | 170 | }; |
fac0d250 | 171 | |
ba8826a8 AO |
172 | /* Don't change the offset of next in line_entry. set_or_check_view |
173 | calls in dwarf2_gen_line_info_1 depend on it. */ | |
174 | static char unused[offsetof(struct line_entry, next) ? -1 : 1] | |
175 | ATTRIBUTE_UNUSED; | |
176 | ||
177 | struct line_subseg | |
178 | { | |
220e750f RH |
179 | struct line_subseg *next; |
180 | subsegT subseg; | |
181 | struct line_entry *head; | |
182 | struct line_entry **ptail; | |
e410add4 | 183 | struct line_entry **pmove_tail; |
220e750f | 184 | }; |
353e2c69 | 185 | |
ba8826a8 AO |
186 | struct line_seg |
187 | { | |
220e750f RH |
188 | struct line_seg *next; |
189 | segT seg; | |
190 | struct line_subseg *head; | |
191 | symbolS *text_start; | |
192 | symbolS *text_end; | |
193 | }; | |
194 | ||
195 | /* Collects data for all line table entries during assembly. */ | |
196 | static struct line_seg *all_segs; | |
1e9cc1c2 | 197 | static struct line_seg **last_seg_ptr; |
220e750f | 198 | |
ba8826a8 AO |
199 | struct file_entry |
200 | { | |
a7ed1ca2 | 201 | const char *filename; |
220e750f RH |
202 | unsigned int dir; |
203 | }; | |
204 | ||
205 | /* Table of files used by .debug_line. */ | |
206 | static struct file_entry *files; | |
207 | static unsigned int files_in_use; | |
208 | static unsigned int files_allocated; | |
209 | ||
a7ed1ca2 NC |
210 | /* Table of directories used by .debug_line. */ |
211 | static char **dirs; | |
212 | static unsigned int dirs_in_use; | |
213 | static unsigned int dirs_allocated; | |
214 | ||
b34976b6 | 215 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
220e750f | 216 | doing work when there's nothing to do. */ |
1eee4adc | 217 | bfd_boolean dwarf2_loc_directive_seen; |
220e750f | 218 | |
07a53e5c RH |
219 | /* TRUE when we're supposed to set the basic block mark whenever a |
220 | label is seen. */ | |
221 | bfd_boolean dwarf2_loc_mark_labels; | |
222 | ||
220e750f | 223 | /* Current location as indicated by the most recent .loc directive. */ |
ba8826a8 AO |
224 | static struct dwarf2_line_info current = |
225 | { | |
bd0eb99b | 226 | 1, 1, 0, 0, |
92846e72 | 227 | DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, |
ba8826a8 | 228 | 0, NULL |
bd0eb99b | 229 | }; |
220e750f | 230 | |
ba8826a8 AO |
231 | /* This symbol is used to recognize view number forced resets in loc |
232 | lists. */ | |
233 | static symbolS *force_reset_view; | |
234 | ||
235 | /* This symbol evaluates to an expression that, if nonzero, indicates | |
236 | some view assert check failed. */ | |
237 | static symbolS *view_assert_failed; | |
238 | ||
220e750f RH |
239 | /* The size of an address on the target. */ |
240 | static unsigned int sizeof_address; | |
241 | \f | |
a2e22468 | 242 | static unsigned int get_filenum (const char *, unsigned int); |
413a266c | 243 | |
c5c0a210 | 244 | #ifndef TC_DWARF2_EMIT_OFFSET |
802f5d9e | 245 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
c5c0a210 | 246 | |
6174d9c8 RH |
247 | /* Create an offset to .dwarf2_*. */ |
248 | ||
249 | static void | |
a2e22468 | 250 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
6174d9c8 | 251 | { |
91d6fa6a | 252 | expressionS exp; |
6174d9c8 | 253 | |
031e3350 | 254 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
255 | exp.X_op = O_symbol; |
256 | exp.X_add_symbol = symbol; | |
257 | exp.X_add_number = 0; | |
258 | emit_expr (&exp, size); | |
6174d9c8 | 259 | } |
c5c0a210 | 260 | #endif |
6174d9c8 | 261 | |
e410add4 | 262 | /* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */ |
220e750f RH |
263 | |
264 | static struct line_subseg * | |
e410add4 | 265 | get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p) |
220e750f | 266 | { |
5f3fd8b4 | 267 | struct line_seg *s = seg_info (seg)->dwarf2_line_seg; |
91d6fa6a | 268 | struct line_subseg **pss, *lss; |
fac0d250 | 269 | |
1e9cc1c2 NC |
270 | if (s == NULL) |
271 | { | |
e410add4 RS |
272 | if (!create_p) |
273 | return NULL; | |
274 | ||
325801bd | 275 | s = XNEW (struct line_seg); |
1e9cc1c2 NC |
276 | s->next = NULL; |
277 | s->seg = seg; | |
278 | s->head = NULL; | |
279 | *last_seg_ptr = s; | |
280 | last_seg_ptr = &s->next; | |
5f3fd8b4 | 281 | seg_info (seg)->dwarf2_line_seg = s; |
1e9cc1c2 NC |
282 | } |
283 | gas_assert (seg == s->seg); | |
220e750f | 284 | |
91d6fa6a | 285 | for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) |
fac0d250 | 286 | { |
91d6fa6a | 287 | if (lss->subseg == subseg) |
ee515fb7 | 288 | goto found_subseg; |
91d6fa6a | 289 | if (lss->subseg > subseg) |
220e750f | 290 | break; |
fac0d250 | 291 | } |
220e750f | 292 | |
325801bd | 293 | lss = XNEW (struct line_subseg); |
91d6fa6a NC |
294 | lss->next = *pss; |
295 | lss->subseg = subseg; | |
296 | lss->head = NULL; | |
297 | lss->ptail = &lss->head; | |
e410add4 | 298 | lss->pmove_tail = &lss->head; |
91d6fa6a | 299 | *pss = lss; |
220e750f RH |
300 | |
301 | found_subseg: | |
91d6fa6a | 302 | return lss; |
fac0d250 RH |
303 | } |
304 | ||
ba8826a8 AO |
305 | /* (Un)reverse the line_entry list starting from H. */ |
306 | ||
307 | static struct line_entry * | |
308 | reverse_line_entry_list (struct line_entry *h) | |
309 | { | |
310 | struct line_entry *p = NULL, *e, *n; | |
311 | ||
312 | for (e = h; e; e = n) | |
313 | { | |
314 | n = e->next; | |
315 | e->next = p; | |
316 | p = e; | |
317 | } | |
318 | return p; | |
319 | } | |
320 | ||
321 | /* Compute the view for E based on the previous entry P. If we | |
322 | introduce an (undefined) view symbol for P, and H is given (P must | |
323 | be the tail in this case), introduce view symbols for earlier list | |
324 | entries as well, until one of them is constant. */ | |
325 | ||
326 | static void | |
327 | set_or_check_view (struct line_entry *e, struct line_entry *p, | |
328 | struct line_entry *h) | |
329 | { | |
330 | expressionS viewx; | |
331 | ||
332 | memset (&viewx, 0, sizeof (viewx)); | |
333 | viewx.X_unsigned = 1; | |
334 | ||
335 | /* First, compute !(E->label > P->label), to tell whether or not | |
336 | we're to reset the view number. If we can't resolve it to a | |
337 | constant, keep it symbolic. */ | |
338 | if (!p || (e->loc.view == force_reset_view && force_reset_view)) | |
339 | { | |
340 | viewx.X_op = O_constant; | |
341 | viewx.X_add_number = 0; | |
342 | viewx.X_add_symbol = NULL; | |
343 | viewx.X_op_symbol = NULL; | |
344 | } | |
345 | else | |
346 | { | |
347 | viewx.X_op = O_gt; | |
348 | viewx.X_add_number = 0; | |
349 | viewx.X_add_symbol = e->label; | |
350 | viewx.X_op_symbol = p->label; | |
351 | resolve_expression (&viewx); | |
352 | if (viewx.X_op == O_constant) | |
353 | viewx.X_add_number = !viewx.X_add_number; | |
354 | else | |
355 | { | |
356 | viewx.X_add_symbol = make_expr_symbol (&viewx); | |
357 | viewx.X_add_number = 0; | |
358 | viewx.X_op_symbol = NULL; | |
359 | viewx.X_op = O_logical_not; | |
360 | } | |
361 | } | |
362 | ||
363 | if (S_IS_DEFINED (e->loc.view) && symbol_constant_p (e->loc.view)) | |
364 | { | |
365 | expressionS *value = symbol_get_value_expression (e->loc.view); | |
366 | /* We can't compare the view numbers at this point, because in | |
367 | VIEWX we've only determined whether we're to reset it so | |
368 | far. */ | |
369 | if (viewx.X_op == O_constant) | |
370 | { | |
371 | if (!value->X_add_number != !viewx.X_add_number) | |
372 | as_bad (_("view number mismatch")); | |
373 | } | |
374 | /* Record the expression to check it later. It is the result of | |
375 | a logical not, thus 0 or 1. We just add up all such deferred | |
376 | expressions, and resolve it at the end. */ | |
377 | else if (!value->X_add_number) | |
378 | { | |
379 | symbolS *deferred = make_expr_symbol (&viewx); | |
380 | if (view_assert_failed) | |
381 | { | |
382 | expressionS chk; | |
031e3350 | 383 | |
ba8826a8 AO |
384 | memset (&chk, 0, sizeof (chk)); |
385 | chk.X_unsigned = 1; | |
386 | chk.X_op = O_add; | |
387 | chk.X_add_number = 0; | |
388 | chk.X_add_symbol = view_assert_failed; | |
389 | chk.X_op_symbol = deferred; | |
390 | deferred = make_expr_symbol (&chk); | |
391 | } | |
392 | view_assert_failed = deferred; | |
393 | } | |
394 | } | |
395 | ||
396 | if (viewx.X_op != O_constant || viewx.X_add_number) | |
397 | { | |
398 | expressionS incv; | |
399 | ||
400 | if (!p->loc.view) | |
401 | { | |
402 | p->loc.view = symbol_temp_make (); | |
403 | gas_assert (!S_IS_DEFINED (p->loc.view)); | |
404 | } | |
405 | ||
406 | memset (&incv, 0, sizeof (incv)); | |
407 | incv.X_unsigned = 1; | |
408 | incv.X_op = O_symbol; | |
409 | incv.X_add_symbol = p->loc.view; | |
410 | incv.X_add_number = 1; | |
411 | ||
412 | if (viewx.X_op == O_constant) | |
413 | { | |
414 | gas_assert (viewx.X_add_number == 1); | |
415 | viewx = incv; | |
416 | } | |
417 | else | |
418 | { | |
419 | viewx.X_add_symbol = make_expr_symbol (&viewx); | |
420 | viewx.X_add_number = 0; | |
421 | viewx.X_op_symbol = make_expr_symbol (&incv); | |
422 | viewx.X_op = O_multiply; | |
423 | } | |
424 | } | |
425 | ||
426 | if (!S_IS_DEFINED (e->loc.view)) | |
427 | { | |
428 | symbol_set_value_expression (e->loc.view, &viewx); | |
429 | S_SET_SEGMENT (e->loc.view, absolute_section); | |
430 | symbol_set_frag (e->loc.view, &zero_address_frag); | |
431 | } | |
432 | ||
433 | /* Define and attempt to simplify any earlier views needed to | |
434 | compute E's. */ | |
435 | if (h && p && p->loc.view && !S_IS_DEFINED (p->loc.view)) | |
436 | { | |
437 | struct line_entry *h2; | |
438 | /* Reverse the list to avoid quadratic behavior going backwards | |
439 | in a single-linked list. */ | |
440 | struct line_entry *r = reverse_line_entry_list (h); | |
441 | ||
442 | gas_assert (r == p); | |
443 | /* Set or check views until we find a defined or absent view. */ | |
444 | do | |
445 | set_or_check_view (r, r->next, NULL); | |
446 | while (r->next && r->next->loc.view && !S_IS_DEFINED (r->next->loc.view) | |
447 | && (r = r->next)); | |
448 | ||
449 | /* Unreverse the list, so that we can go forward again. */ | |
450 | h2 = reverse_line_entry_list (p); | |
451 | gas_assert (h2 == h); | |
452 | ||
453 | /* Starting from the last view we just defined, attempt to | |
454 | simplify the view expressions, until we do so to P. */ | |
455 | do | |
456 | { | |
457 | gas_assert (S_IS_DEFINED (r->loc.view)); | |
458 | resolve_expression (symbol_get_value_expression (r->loc.view)); | |
459 | } | |
460 | while (r != p && (r = r->next)); | |
461 | ||
462 | /* Now that we've defined and computed all earlier views that might | |
463 | be needed to compute E's, attempt to simplify it. */ | |
464 | resolve_expression (symbol_get_value_expression (e->loc.view)); | |
465 | } | |
466 | } | |
467 | ||
6a50d470 | 468 | /* Record an entry for LOC occurring at LABEL. */ |
07a53e5c RH |
469 | |
470 | static void | |
6a50d470 | 471 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
07a53e5c | 472 | { |
6a50d470 | 473 | struct line_subseg *lss; |
07a53e5c RH |
474 | struct line_entry *e; |
475 | ||
325801bd | 476 | e = XNEW (struct line_entry); |
07a53e5c | 477 | e->next = NULL; |
6a50d470 | 478 | e->label = label; |
07a53e5c RH |
479 | e->loc = *loc; |
480 | ||
e410add4 | 481 | lss = get_line_subseg (now_seg, now_subseg, TRUE); |
ba8826a8 AO |
482 | |
483 | if (loc->view) | |
484 | set_or_check_view (e, | |
485 | !lss->head ? NULL : (struct line_entry *)lss->ptail, | |
486 | lss->head); | |
487 | ||
6a50d470 RS |
488 | *lss->ptail = e; |
489 | lss->ptail = &e->next; | |
07a53e5c RH |
490 | } |
491 | ||
436d9e46 | 492 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
353e2c69 | 493 | |
220e750f | 494 | void |
a2e22468 | 495 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
fac0d250 | 496 | { |
1ea5c325 MS |
497 | static unsigned int line = -1; |
498 | static unsigned int filenum = -1; | |
220e750f | 499 | |
6a50d470 RS |
500 | symbolS *sym; |
501 | ||
220e750f RH |
502 | /* Early out for as-yet incomplete location information. */ |
503 | if (loc->filenum == 0 || loc->line == 0) | |
504 | return; | |
505 | ||
ffa554ed GK |
506 | /* Don't emit sequences of line symbols for the same line when the |
507 | symbols apply to assembler code. It is necessary to emit | |
508 | duplicate line symbols when a compiler asks for them, because GDB | |
509 | uses them to determine the end of the prologue. */ | |
d1a6c242 | 510 | if (debug_type == DEBUG_DWARF2 |
ffa554ed | 511 | && line == loc->line && filenum == loc->filenum) |
1ea5c325 MS |
512 | return; |
513 | ||
514 | line = loc->line; | |
515 | filenum = loc->filenum; | |
516 | ||
453dc3f0 NC |
517 | if (linkrelax) |
518 | { | |
519 | char name[120]; | |
520 | ||
521 | /* Use a non-fake name for the line number location, | |
522 | so that it can be referred to by relocations. */ | |
523 | sprintf (name, ".Loc.%u.%u", line, filenum); | |
6a50d470 | 524 | sym = symbol_new (name, now_seg, ofs, frag_now); |
453dc3f0 NC |
525 | } |
526 | else | |
6a50d470 RS |
527 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
528 | dwarf2_gen_line_info_1 (sym, loc); | |
220e750f | 529 | } |
fac0d250 | 530 | |
ecea7679 RH |
531 | /* Returns the current source information. If .file directives have |
532 | been encountered, the info for the corresponding source file is | |
533 | returned. Otherwise, the info for the assembly source file is | |
534 | returned. */ | |
535 | ||
220e750f | 536 | void |
a2e22468 | 537 | dwarf2_where (struct dwarf2_line_info *line) |
220e750f RH |
538 | { |
539 | if (debug_type == DEBUG_DWARF2) | |
fac0d250 | 540 | { |
ba8826a8 AO |
541 | const char *filename; |
542 | ||
543 | memset (line, 0, sizeof (*line)); | |
544 | filename = as_where (&line->line); | |
a7ed1ca2 | 545 | line->filenum = get_filenum (filename, 0); |
220e750f | 546 | line->column = 0; |
bd0eb99b | 547 | line->flags = DWARF2_FLAG_IS_STMT; |
ecea7679 | 548 | line->isa = current.isa; |
92846e72 | 549 | line->discriminator = current.discriminator; |
ba8826a8 | 550 | line->view = NULL; |
fac0d250 | 551 | } |
220e750f RH |
552 | else |
553 | *line = current; | |
fac0d250 RH |
554 | } |
555 | ||
7fd3924a | 556 | /* A hook to allow the target backend to inform the line number state |
ecea7679 RH |
557 | machine of isa changes when assembler debug info is enabled. */ |
558 | ||
559 | void | |
560 | dwarf2_set_isa (unsigned int isa) | |
561 | { | |
562 | current.isa = isa; | |
563 | } | |
564 | ||
220e750f RH |
565 | /* Called for each machine instruction, or relatively atomic group of |
566 | machine instructions (ie built-in macro). The instruction or group | |
567 | is SIZE bytes in length. If dwarf2 line number generation is called | |
568 | for, emit a line statement appropriately. */ | |
353e2c69 | 569 | |
220e750f | 570 | void |
a2e22468 | 571 | dwarf2_emit_insn (int size) |
fac0d250 | 572 | { |
220e750f | 573 | struct dwarf2_line_info loc; |
fac0d250 | 574 | |
ba8826a8 AO |
575 | if (debug_type != DEBUG_DWARF2 |
576 | ? !dwarf2_loc_directive_seen | |
577 | : !seen_at_least_1_file ()) | |
220e750f | 578 | return; |
7fd3924a AM |
579 | |
580 | dwarf2_where (&loc); | |
b6675117 | 581 | |
220e750f | 582 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
661ba50f BW |
583 | dwarf2_consume_line_info (); |
584 | } | |
585 | ||
e410add4 RS |
586 | /* Move all previously-emitted line entries for the current position by |
587 | DELTA bytes. This function cannot be used to move the same entries | |
588 | twice. */ | |
589 | ||
590 | void | |
591 | dwarf2_move_insn (int delta) | |
592 | { | |
593 | struct line_subseg *lss; | |
594 | struct line_entry *e; | |
595 | valueT now; | |
596 | ||
597 | if (delta == 0) | |
598 | return; | |
599 | ||
600 | lss = get_line_subseg (now_seg, now_subseg, FALSE); | |
601 | if (!lss) | |
602 | return; | |
603 | ||
604 | now = frag_now_fix (); | |
605 | while ((e = *lss->pmove_tail)) | |
606 | { | |
607 | if (S_GET_VALUE (e->label) == now) | |
608 | S_SET_VALUE (e->label, now + delta); | |
609 | lss->pmove_tail = &e->next; | |
610 | } | |
611 | } | |
612 | ||
661ba50f BW |
613 | /* Called after the current line information has been either used with |
614 | dwarf2_gen_line_info or saved with a machine instruction for later use. | |
615 | This resets the state of the line number information to reflect that | |
616 | it has been used. */ | |
617 | ||
618 | void | |
619 | dwarf2_consume_line_info (void) | |
620 | { | |
621 | /* Unless we generate DWARF2 debugging information for each | |
622 | assembler line, we only emit one line symbol for one LOC. */ | |
7fd3924a | 623 | dwarf2_loc_directive_seen = FALSE; |
bd0eb99b RH |
624 | |
625 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK | |
626 | | DWARF2_FLAG_PROLOGUE_END | |
627 | | DWARF2_FLAG_EPILOGUE_BEGIN); | |
92846e72 | 628 | current.discriminator = 0; |
3a00b02d | 629 | current.view = NULL; |
220e750f | 630 | } |
fac0d250 | 631 | |
07a53e5c RH |
632 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
633 | is enabled, emit a basic block marker. */ | |
634 | ||
635 | void | |
636 | dwarf2_emit_label (symbolS *label) | |
637 | { | |
638 | struct dwarf2_line_info loc; | |
639 | ||
640 | if (!dwarf2_loc_mark_labels) | |
641 | return; | |
642 | if (S_GET_SEGMENT (label) != now_seg) | |
643 | return; | |
644 | if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) | |
645 | return; | |
7fd3924a AM |
646 | if (files_in_use == 0 && debug_type != DEBUG_DWARF2) |
647 | return; | |
648 | ||
649 | dwarf2_where (&loc); | |
07a53e5c RH |
650 | |
651 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
652 | ||
6a50d470 | 653 | dwarf2_gen_line_info_1 (label, &loc); |
7fd3924a | 654 | dwarf2_consume_line_info (); |
07a53e5c RH |
655 | } |
656 | ||
a7ed1ca2 NC |
657 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
658 | allocate it on that file table slot, otherwise return the first | |
659 | empty one. */ | |
220e750f RH |
660 | |
661 | static unsigned int | |
a2e22468 | 662 | get_filenum (const char *filename, unsigned int num) |
220e750f | 663 | { |
a7ed1ca2 NC |
664 | static unsigned int last_used, last_used_dir_len; |
665 | const char *file; | |
666 | size_t dir_len; | |
667 | unsigned int i, dir; | |
220e750f | 668 | |
a7ed1ca2 NC |
669 | if (num == 0 && last_used) |
670 | { | |
671 | if (! files[last_used].dir | |
8b6efd89 | 672 | && filename_cmp (filename, files[last_used].filename) == 0) |
a7ed1ca2 NC |
673 | return last_used; |
674 | if (files[last_used].dir | |
8b6efd89 KT |
675 | && filename_ncmp (filename, dirs[files[last_used].dir], |
676 | last_used_dir_len) == 0 | |
a7ed1ca2 | 677 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) |
8b6efd89 KT |
678 | && filename_cmp (filename + last_used_dir_len + 1, |
679 | files[last_used].filename) == 0) | |
a7ed1ca2 NC |
680 | return last_used; |
681 | } | |
220e750f | 682 | |
a7ed1ca2 NC |
683 | file = lbasename (filename); |
684 | /* Don't make empty string from / or A: from A:/ . */ | |
685 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
686 | if (file <= filename + 3) | |
687 | file = filename; | |
688 | #else | |
689 | if (file == filename + 1) | |
690 | file = filename; | |
691 | #endif | |
692 | dir_len = file - filename; | |
693 | ||
694 | dir = 0; | |
695 | if (dir_len) | |
696 | { | |
01e1a5bc | 697 | #ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR |
a7ed1ca2 | 698 | --dir_len; |
01e1a5bc | 699 | #endif |
a7ed1ca2 | 700 | for (dir = 1; dir < dirs_in_use; ++dir) |
8b6efd89 | 701 | if (filename_ncmp (filename, dirs[dir], dir_len) == 0 |
a7ed1ca2 NC |
702 | && dirs[dir][dir_len] == '\0') |
703 | break; | |
704 | ||
705 | if (dir >= dirs_in_use) | |
706 | { | |
707 | if (dir >= dirs_allocated) | |
708 | { | |
709 | dirs_allocated = dir + 32; | |
325801bd | 710 | dirs = XRESIZEVEC (char *, dirs, dirs_allocated); |
a7ed1ca2 NC |
711 | } |
712 | ||
29a2809e | 713 | dirs[dir] = xmemdup0 (filename, dir_len); |
a7ed1ca2 NC |
714 | dirs_in_use = dir + 1; |
715 | } | |
716 | } | |
717 | ||
718 | if (num == 0) | |
719 | { | |
720 | for (i = 1; i < files_in_use; ++i) | |
721 | if (files[i].dir == dir | |
88b4ca40 | 722 | && files[i].filename |
8b6efd89 | 723 | && filename_cmp (file, files[i].filename) == 0) |
a7ed1ca2 NC |
724 | { |
725 | last_used = i; | |
726 | last_used_dir_len = dir_len; | |
727 | return i; | |
728 | } | |
729 | } | |
730 | else | |
731 | i = num; | |
220e750f RH |
732 | |
733 | if (i >= files_allocated) | |
fac0d250 | 734 | { |
249e3833 RH |
735 | unsigned int old = files_allocated; |
736 | ||
220e750f | 737 | files_allocated = i + 32; |
325801bd | 738 | files = XRESIZEVEC (struct file_entry, files, files_allocated); |
249e3833 RH |
739 | |
740 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); | |
fac0d250 RH |
741 | } |
742 | ||
a7ed1ca2 NC |
743 | files[i].filename = num ? file : xstrdup (file); |
744 | files[i].dir = dir; | |
10cd14b4 AM |
745 | if (files_in_use < i + 1) |
746 | files_in_use = i + 1; | |
220e750f | 747 | last_used = i; |
a7ed1ca2 | 748 | last_used_dir_len = dir_len; |
220e750f RH |
749 | |
750 | return i; | |
751 | } | |
fac0d250 | 752 | |
ecb4347a DJ |
753 | /* Handle two forms of .file directive: |
754 | - Pass .file "source.c" to s_app_file | |
755 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table | |
220e750f | 756 | |
68d20676 | 757 | If an entry is added to the file table, return a pointer to the filename. */ |
ecb4347a DJ |
758 | |
759 | char * | |
68d20676 | 760 | dwarf2_directive_filename (void) |
220e750f RH |
761 | { |
762 | offsetT num; | |
e46d99eb | 763 | char *filename; |
220e750f RH |
764 | int filename_len; |
765 | ||
766 | /* Continue to accept a bare string and pass it off. */ | |
767 | SKIP_WHITESPACE (); | |
768 | if (*input_line_pointer == '"') | |
fac0d250 | 769 | { |
220e750f | 770 | s_app_file (0); |
ecb4347a | 771 | return NULL; |
fac0d250 RH |
772 | } |
773 | ||
220e750f RH |
774 | num = get_absolute_expression (); |
775 | filename = demand_copy_C_string (&filename_len); | |
bd0eb99b RH |
776 | if (filename == NULL) |
777 | return NULL; | |
220e750f RH |
778 | demand_empty_rest_of_line (); |
779 | ||
249e3833 | 780 | if (num < 1) |
fac0d250 | 781 | { |
0e389e77 | 782 | as_bad (_("file number less than one")); |
ecb4347a | 783 | return NULL; |
fac0d250 RH |
784 | } |
785 | ||
7cadeb2c AM |
786 | /* A .file directive implies compiler generated debug information is |
787 | being supplied. Turn off gas generated debug info. */ | |
788 | debug_type = DEBUG_NONE; | |
789 | ||
0e1a166b | 790 | if (num < (int) files_in_use && files[num].filename != 0) |
220e750f | 791 | { |
0e389e77 | 792 | as_bad (_("file number %ld already allocated"), (long) num); |
ecb4347a | 793 | return NULL; |
249e3833 | 794 | } |
220e750f | 795 | |
a7ed1ca2 | 796 | get_filenum (filename, num); |
ecb4347a DJ |
797 | |
798 | return filename; | |
fac0d250 RH |
799 | } |
800 | ||
68d20676 NC |
801 | /* Calls dwarf2_directive_filename, but discards its result. |
802 | Used in pseudo-op tables where the function result is ignored. */ | |
803 | ||
804 | void | |
805 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) | |
806 | { | |
807 | (void) dwarf2_directive_filename (); | |
808 | } | |
809 | ||
220e750f | 810 | void |
a2e22468 | 811 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
220e750f | 812 | { |
ecea7679 RH |
813 | offsetT filenum, line; |
814 | ||
851feff8 DJ |
815 | /* If we see two .loc directives in a row, force the first one to be |
816 | output now. */ | |
7cadeb2c | 817 | if (dwarf2_loc_directive_seen) |
6a50d470 | 818 | dwarf2_emit_insn (0); |
851feff8 | 819 | |
ecea7679 RH |
820 | filenum = get_absolute_expression (); |
821 | SKIP_WHITESPACE (); | |
822 | line = get_absolute_expression (); | |
823 | ||
824 | if (filenum < 1) | |
825 | { | |
826 | as_bad (_("file number less than one")); | |
827 | return; | |
828 | } | |
829 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) | |
830 | { | |
831 | as_bad (_("unassigned file number %ld"), (long) filenum); | |
832 | return; | |
833 | } | |
834 | ||
835 | current.filenum = filenum; | |
836 | current.line = line; | |
92846e72 | 837 | current.discriminator = 0; |
ecea7679 RH |
838 | |
839 | #ifndef NO_LISTING | |
840 | if (listing) | |
841 | { | |
842 | if (files[filenum].dir) | |
843 | { | |
844 | size_t dir_len = strlen (dirs[files[filenum].dir]); | |
845 | size_t file_len = strlen (files[filenum].filename); | |
add39d23 | 846 | char *cp = XNEWVEC (char, dir_len + 1 + file_len + 1); |
ecea7679 RH |
847 | |
848 | memcpy (cp, dirs[files[filenum].dir], dir_len); | |
56487c55 | 849 | INSERT_DIR_SEPARATOR (cp, dir_len); |
ecea7679 RH |
850 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
851 | cp[dir_len + file_len + 1] = '\0'; | |
852 | listing_source_file (cp); | |
e1fa0163 | 853 | free (cp); |
ecea7679 RH |
854 | } |
855 | else | |
856 | listing_source_file (files[filenum].filename); | |
857 | listing_source_line (line); | |
858 | } | |
859 | #endif | |
860 | ||
220e750f | 861 | SKIP_WHITESPACE (); |
ecea7679 RH |
862 | if (ISDIGIT (*input_line_pointer)) |
863 | { | |
864 | current.column = get_absolute_expression (); | |
865 | SKIP_WHITESPACE (); | |
866 | } | |
867 | ||
868 | while (ISALPHA (*input_line_pointer)) | |
220e750f | 869 | { |
bd0eb99b RH |
870 | char *p, c; |
871 | offsetT value; | |
872 | ||
d02603dc | 873 | c = get_symbol_name (& p); |
bd0eb99b RH |
874 | |
875 | if (strcmp (p, "basic_block") == 0) | |
876 | { | |
877 | current.flags |= DWARF2_FLAG_BASIC_BLOCK; | |
878 | *input_line_pointer = c; | |
879 | } | |
880 | else if (strcmp (p, "prologue_end") == 0) | |
881 | { | |
882 | current.flags |= DWARF2_FLAG_PROLOGUE_END; | |
883 | *input_line_pointer = c; | |
884 | } | |
885 | else if (strcmp (p, "epilogue_begin") == 0) | |
886 | { | |
887 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN; | |
888 | *input_line_pointer = c; | |
889 | } | |
890 | else if (strcmp (p, "is_stmt") == 0) | |
891 | { | |
d02603dc | 892 | (void) restore_line_pointer (c); |
bd0eb99b RH |
893 | value = get_absolute_expression (); |
894 | if (value == 0) | |
895 | current.flags &= ~DWARF2_FLAG_IS_STMT; | |
896 | else if (value == 1) | |
897 | current.flags |= DWARF2_FLAG_IS_STMT; | |
898 | else | |
ecea7679 RH |
899 | { |
900 | as_bad (_("is_stmt value not 0 or 1")); | |
901 | return; | |
902 | } | |
bd0eb99b RH |
903 | } |
904 | else if (strcmp (p, "isa") == 0) | |
905 | { | |
d02603dc | 906 | (void) restore_line_pointer (c); |
bd0eb99b | 907 | value = get_absolute_expression (); |
ecea7679 | 908 | if (value >= 0) |
bd0eb99b | 909 | current.isa = value; |
ecea7679 RH |
910 | else |
911 | { | |
912 | as_bad (_("isa number less than zero")); | |
913 | return; | |
914 | } | |
bd0eb99b | 915 | } |
92846e72 CC |
916 | else if (strcmp (p, "discriminator") == 0) |
917 | { | |
d02603dc | 918 | (void) restore_line_pointer (c); |
92846e72 CC |
919 | value = get_absolute_expression (); |
920 | if (value >= 0) | |
921 | current.discriminator = value; | |
922 | else | |
923 | { | |
924 | as_bad (_("discriminator less than zero")); | |
925 | return; | |
926 | } | |
927 | } | |
ba8826a8 AO |
928 | else if (strcmp (p, "view") == 0) |
929 | { | |
930 | symbolS *sym; | |
931 | ||
932 | (void) restore_line_pointer (c); | |
933 | SKIP_WHITESPACE (); | |
934 | ||
935 | if (ISDIGIT (*input_line_pointer) | |
936 | || *input_line_pointer == '-') | |
937 | { | |
938 | bfd_boolean force_reset = *input_line_pointer == '-'; | |
939 | ||
940 | value = get_absolute_expression (); | |
941 | if (value != 0) | |
942 | { | |
943 | as_bad (_("numeric view can only be asserted to zero")); | |
944 | return; | |
945 | } | |
946 | if (force_reset && force_reset_view) | |
947 | sym = force_reset_view; | |
948 | else | |
949 | { | |
950 | sym = symbol_temp_new (absolute_section, value, | |
951 | &zero_address_frag); | |
952 | if (force_reset) | |
953 | force_reset_view = sym; | |
954 | } | |
955 | } | |
956 | else | |
957 | { | |
958 | char *name = read_symbol_name (); | |
959 | ||
960 | if (!name) | |
961 | return; | |
962 | sym = symbol_find_or_make (name); | |
963 | if (S_IS_DEFINED (sym)) | |
964 | { | |
965 | if (!S_CAN_BE_REDEFINED (sym)) | |
966 | as_bad (_("symbol `%s' is already defined"), name); | |
967 | else | |
968 | sym = symbol_clone (sym, 1); | |
969 | S_SET_SEGMENT (sym, undefined_section); | |
970 | S_SET_VALUE (sym, 0); | |
971 | symbol_set_frag (sym, &zero_address_frag); | |
972 | } | |
973 | } | |
974 | current.view = sym; | |
975 | } | |
bd0eb99b RH |
976 | else |
977 | { | |
ecea7679 | 978 | as_bad (_("unknown .loc sub-directive `%s'"), p); |
d02603dc | 979 | (void) restore_line_pointer (c); |
bd0eb99b RH |
980 | return; |
981 | } | |
982 | ||
d02603dc | 983 | SKIP_WHITESPACE_AFTER_NAME (); |
bd0eb99b RH |
984 | } |
985 | ||
986 | demand_empty_rest_of_line (); | |
1eee4adc | 987 | dwarf2_loc_directive_seen = TRUE; |
7cadeb2c | 988 | debug_type = DEBUG_NONE; |
ba8826a8 AO |
989 | |
990 | /* If we were given a view id, emit the row right away. */ | |
991 | if (current.view) | |
992 | dwarf2_emit_insn (0); | |
220e750f | 993 | } |
07a53e5c RH |
994 | |
995 | void | |
996 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) | |
997 | { | |
998 | offsetT value = get_absolute_expression (); | |
999 | ||
1000 | if (value != 0 && value != 1) | |
1001 | { | |
1002 | as_bad (_("expected 0 or 1")); | |
1003 | ignore_rest_of_line (); | |
1004 | } | |
1005 | else | |
1006 | { | |
1007 | dwarf2_loc_mark_labels = value != 0; | |
1008 | demand_empty_rest_of_line (); | |
1009 | } | |
1010 | } | |
220e750f RH |
1011 | \f |
1012 | static struct frag * | |
a2e22468 | 1013 | first_frag_for_seg (segT seg) |
220e750f | 1014 | { |
c9049d30 | 1015 | return seg_info (seg)->frchainP->frch_root; |
220e750f RH |
1016 | } |
1017 | ||
1018 | static struct frag * | |
a2e22468 | 1019 | last_frag_for_seg (segT seg) |
220e750f | 1020 | { |
c9049d30 | 1021 | frchainS *f = seg_info (seg)->frchainP; |
220e750f | 1022 | |
c9049d30 AM |
1023 | while (f->frch_next != NULL) |
1024 | f = f->frch_next; | |
220e750f | 1025 | |
c9049d30 | 1026 | return f->frch_last; |
220e750f RH |
1027 | } |
1028 | \f | |
1029 | /* Emit a single byte into the current segment. */ | |
1030 | ||
1031 | static inline void | |
a2e22468 | 1032 | out_byte (int byte) |
220e750f RH |
1033 | { |
1034 | FRAG_APPEND_1_CHAR (byte); | |
1035 | } | |
1036 | ||
1037 | /* Emit a statement program opcode into the current segment. */ | |
1038 | ||
1039 | static inline void | |
a2e22468 | 1040 | out_opcode (int opc) |
220e750f RH |
1041 | { |
1042 | out_byte (opc); | |
1043 | } | |
1044 | ||
1045 | /* Emit a two-byte word into the current segment. */ | |
1046 | ||
1047 | static inline void | |
a2e22468 | 1048 | out_two (int data) |
220e750f RH |
1049 | { |
1050 | md_number_to_chars (frag_more (2), data, 2); | |
1051 | } | |
1052 | ||
1053 | /* Emit a four byte word into the current segment. */ | |
1054 | ||
1055 | static inline void | |
a2e22468 | 1056 | out_four (int data) |
220e750f RH |
1057 | { |
1058 | md_number_to_chars (frag_more (4), data, 4); | |
1059 | } | |
1060 | ||
1061 | /* Emit an unsigned "little-endian base 128" number. */ | |
1062 | ||
fac0d250 | 1063 | static void |
a2e22468 | 1064 | out_uleb128 (addressT value) |
220e750f RH |
1065 | { |
1066 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); | |
1067 | } | |
1068 | ||
92846e72 CC |
1069 | /* Emit a signed "little-endian base 128" number. */ |
1070 | ||
1071 | static void | |
1072 | out_leb128 (addressT value) | |
1073 | { | |
1074 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); | |
1075 | } | |
1076 | ||
220e750f RH |
1077 | /* Emit a tuple for .debug_abbrev. */ |
1078 | ||
1079 | static inline void | |
a2e22468 | 1080 | out_abbrev (int name, int form) |
fac0d250 | 1081 | { |
220e750f RH |
1082 | out_uleb128 (name); |
1083 | out_uleb128 (form); | |
1084 | } | |
fac0d250 | 1085 | |
220e750f | 1086 | /* Get the size of a fragment. */ |
fac0d250 | 1087 | |
220e750f | 1088 | static offsetT |
c9049d30 | 1089 | get_frag_fix (fragS *frag, segT seg) |
220e750f RH |
1090 | { |
1091 | frchainS *fr; | |
1092 | ||
1093 | if (frag->fr_next) | |
1094 | return frag->fr_fix; | |
1095 | ||
1096 | /* If a fragment is the last in the chain, special measures must be | |
1097 | taken to find its size before relaxation, since it may be pending | |
1098 | on some subsegment chain. */ | |
c9049d30 | 1099 | for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) |
220e750f | 1100 | if (fr->frch_last == frag) |
c5c0a210 | 1101 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
220e750f RH |
1102 | |
1103 | abort (); | |
1104 | } | |
fac0d250 | 1105 | |
220e750f | 1106 | /* Set an absolute address (may result in a relocation entry). */ |
fac0d250 | 1107 | |
220e750f | 1108 | static void |
07a53e5c | 1109 | out_set_addr (symbolS *sym) |
220e750f | 1110 | { |
91d6fa6a | 1111 | expressionS exp; |
9e3af0e7 | 1112 | |
031e3350 | 1113 | memset (&exp, 0, sizeof exp); |
fac0d250 | 1114 | out_opcode (DW_LNS_extended_op); |
220e750f | 1115 | out_uleb128 (sizeof_address + 1); |
fac0d250 RH |
1116 | |
1117 | out_opcode (DW_LNE_set_address); | |
91d6fa6a NC |
1118 | exp.X_op = O_symbol; |
1119 | exp.X_add_symbol = sym; | |
1120 | exp.X_add_number = 0; | |
1121 | emit_expr (&exp, sizeof_address); | |
fac0d250 RH |
1122 | } |
1123 | ||
a2e22468 | 1124 | static void scale_addr_delta (addressT *); |
c8970b4b | 1125 | |
a3b75434 | 1126 | static void |
d7342424 | 1127 | scale_addr_delta (addressT *addr_delta) |
a3b75434 DD |
1128 | { |
1129 | static int printed_this = 0; | |
8fbf7334 | 1130 | if (DWARF2_LINE_MIN_INSN_LENGTH > 1) |
a3b75434 | 1131 | { |
8fbf7334 JL |
1132 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this) |
1133 | { | |
1134 | as_bad("unaligned opcodes detected in executable segment"); | |
1135 | printed_this = 1; | |
1136 | } | |
1137 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; | |
a3b75434 | 1138 | } |
a3b75434 | 1139 | } |
a3b75434 | 1140 | |
220e750f RH |
1141 | /* Encode a pair of line and address skips as efficiently as possible. |
1142 | Note that the line skip is signed, whereas the address skip is unsigned. | |
353e2c69 | 1143 | |
220e750f RH |
1144 | The following two routines *must* be kept in sync. This is |
1145 | enforced by making emit_inc_line_addr abort if we do not emit | |
1146 | exactly the expected number of bytes. */ | |
1147 | ||
1148 | static int | |
a2e22468 | 1149 | size_inc_line_addr (int line_delta, addressT addr_delta) |
fac0d250 | 1150 | { |
220e750f RH |
1151 | unsigned int tmp, opcode; |
1152 | int len = 0; | |
fac0d250 | 1153 | |
220e750f | 1154 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 | 1155 | scale_addr_delta (&addr_delta); |
220e750f RH |
1156 | |
1157 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. | |
1158 | We cannot use special opcodes here, since we want the end_sequence | |
1159 | to emit the matrix entry. */ | |
1160 | if (line_delta == INT_MAX) | |
fac0d250 | 1161 | { |
220e750f RH |
1162 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
1163 | len = 1; | |
fac0d250 | 1164 | else |
220e750f RH |
1165 | len = 1 + sizeof_leb128 (addr_delta, 0); |
1166 | return len + 3; | |
fac0d250 | 1167 | } |
fac0d250 | 1168 | |
220e750f RH |
1169 | /* Bias the line delta by the base. */ |
1170 | tmp = line_delta - DWARF2_LINE_BASE; | |
fac0d250 | 1171 | |
220e750f RH |
1172 | /* If the line increment is out of range of a special opcode, we |
1173 | must encode it with DW_LNS_advance_line. */ | |
1174 | if (tmp >= DWARF2_LINE_RANGE) | |
1175 | { | |
1176 | len = 1 + sizeof_leb128 (line_delta, 1); | |
1177 | line_delta = 0; | |
1178 | tmp = 0 - DWARF2_LINE_BASE; | |
1179 | } | |
fac0d250 | 1180 | |
220e750f RH |
1181 | /* Bias the opcode by the special opcode base. */ |
1182 | tmp += DWARF2_LINE_OPCODE_BASE; | |
353e2c69 | 1183 | |
220e750f RH |
1184 | /* Avoid overflow when addr_delta is large. */ |
1185 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
1186 | { | |
1187 | /* Try using a special opcode. */ | |
1188 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
1189 | if (opcode <= 255) | |
1190 | return len + 1; | |
1191 | ||
1192 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
1193 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
1194 | if (opcode <= 255) | |
1195 | return len + 2; | |
1196 | } | |
1197 | ||
1198 | /* Otherwise use DW_LNS_advance_pc. */ | |
1199 | len += 1 + sizeof_leb128 (addr_delta, 0); | |
1200 | ||
1201 | /* DW_LNS_copy or special opcode. */ | |
1202 | len += 1; | |
1203 | ||
1204 | return len; | |
1205 | } | |
fac0d250 | 1206 | |
220e750f | 1207 | static void |
a2e22468 | 1208 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
220e750f RH |
1209 | { |
1210 | unsigned int tmp, opcode; | |
1211 | int need_copy = 0; | |
1212 | char *end = p + len; | |
fac0d250 | 1213 | |
07a53e5c RH |
1214 | /* Line number sequences cannot go backward in addresses. This means |
1215 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 1216 | gas_assert ((offsetT) addr_delta >= 0); |
07a53e5c | 1217 | |
220e750f | 1218 | /* Scale the address delta by the minimum instruction length. */ |
a3b75434 DD |
1219 | scale_addr_delta (&addr_delta); |
1220 | ||
220e750f RH |
1221 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
1222 | We cannot use special opcodes here, since we want the end_sequence | |
1223 | to emit the matrix entry. */ | |
1224 | if (line_delta == INT_MAX) | |
fac0d250 | 1225 | { |
220e750f RH |
1226 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
1227 | *p++ = DW_LNS_const_add_pc; | |
1228 | else | |
fac0d250 | 1229 | { |
220e750f RH |
1230 | *p++ = DW_LNS_advance_pc; |
1231 | p += output_leb128 (p, addr_delta, 0); | |
fac0d250 | 1232 | } |
220e750f RH |
1233 | |
1234 | *p++ = DW_LNS_extended_op; | |
1235 | *p++ = 1; | |
1236 | *p++ = DW_LNE_end_sequence; | |
1237 | goto done; | |
fac0d250 RH |
1238 | } |
1239 | ||
220e750f RH |
1240 | /* Bias the line delta by the base. */ |
1241 | tmp = line_delta - DWARF2_LINE_BASE; | |
1242 | ||
1243 | /* If the line increment is out of range of a special opcode, we | |
1244 | must encode it with DW_LNS_advance_line. */ | |
1245 | if (tmp >= DWARF2_LINE_RANGE) | |
fac0d250 | 1246 | { |
220e750f RH |
1247 | *p++ = DW_LNS_advance_line; |
1248 | p += output_leb128 (p, line_delta, 1); | |
fac0d250 | 1249 | |
220e750f RH |
1250 | line_delta = 0; |
1251 | tmp = 0 - DWARF2_LINE_BASE; | |
1252 | need_copy = 1; | |
1253 | } | |
fac0d250 | 1254 | |
bd0eb99b RH |
1255 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
1256 | special opcode. */ | |
1257 | if (line_delta == 0 && addr_delta == 0) | |
1258 | { | |
1259 | *p++ = DW_LNS_copy; | |
1260 | goto done; | |
1261 | } | |
1262 | ||
220e750f RH |
1263 | /* Bias the opcode by the special opcode base. */ |
1264 | tmp += DWARF2_LINE_OPCODE_BASE; | |
fac0d250 | 1265 | |
220e750f RH |
1266 | /* Avoid overflow when addr_delta is large. */ |
1267 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) | |
fac0d250 | 1268 | { |
220e750f RH |
1269 | /* Try using a special opcode. */ |
1270 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; | |
1271 | if (opcode <= 255) | |
1272 | { | |
1273 | *p++ = opcode; | |
1274 | goto done; | |
1275 | } | |
1276 | ||
1277 | /* Try using DW_LNS_const_add_pc followed by special op. */ | |
1278 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; | |
1279 | if (opcode <= 255) | |
fac0d250 | 1280 | { |
220e750f RH |
1281 | *p++ = DW_LNS_const_add_pc; |
1282 | *p++ = opcode; | |
1283 | goto done; | |
fac0d250 RH |
1284 | } |
1285 | } | |
220e750f RH |
1286 | |
1287 | /* Otherwise use DW_LNS_advance_pc. */ | |
1288 | *p++ = DW_LNS_advance_pc; | |
1289 | p += output_leb128 (p, addr_delta, 0); | |
1290 | ||
1291 | if (need_copy) | |
1292 | *p++ = DW_LNS_copy; | |
fac0d250 | 1293 | else |
220e750f | 1294 | *p++ = tmp; |
fac0d250 | 1295 | |
220e750f | 1296 | done: |
9c2799c2 | 1297 | gas_assert (p == end); |
220e750f | 1298 | } |
a8316fe2 | 1299 | |
220e750f | 1300 | /* Handy routine to combine calls to the above two routines. */ |
e1c05f12 | 1301 | |
220e750f | 1302 | static void |
a2e22468 | 1303 | out_inc_line_addr (int line_delta, addressT addr_delta) |
220e750f RH |
1304 | { |
1305 | int len = size_inc_line_addr (line_delta, addr_delta); | |
1306 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); | |
1307 | } | |
9de8d8f1 | 1308 | |
1737851b BW |
1309 | /* Write out an alternative form of line and address skips using |
1310 | DW_LNS_fixed_advance_pc opcodes. This uses more space than the default | |
7ddd14de BW |
1311 | line and address information, but it is required if linker relaxation |
1312 | could change the code offsets. The following two routines *must* be | |
1313 | kept in sync. */ | |
453dc3f0 | 1314 | #define ADDR_DELTA_LIMIT 50000 |
1737851b | 1315 | |
7ddd14de BW |
1316 | static int |
1317 | size_fixed_inc_line_addr (int line_delta, addressT addr_delta) | |
1737851b | 1318 | { |
7ddd14de | 1319 | int len = 0; |
1737851b BW |
1320 | |
1321 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ | |
7ddd14de BW |
1322 | if (line_delta != INT_MAX) |
1323 | len = 1 + sizeof_leb128 (line_delta, 1); | |
1324 | ||
453dc3f0 | 1325 | if (addr_delta > ADDR_DELTA_LIMIT) |
7ddd14de BW |
1326 | { |
1327 | /* DW_LNS_extended_op */ | |
1328 | len += 1 + sizeof_leb128 (sizeof_address + 1, 0); | |
1329 | /* DW_LNE_set_address */ | |
1330 | len += 1 + sizeof_address; | |
1331 | } | |
1332 | else | |
1333 | /* DW_LNS_fixed_advance_pc */ | |
1334 | len += 3; | |
1335 | ||
1737851b | 1336 | if (line_delta == INT_MAX) |
7ddd14de BW |
1337 | /* DW_LNS_extended_op + DW_LNE_end_sequence */ |
1338 | len += 3; | |
1339 | else | |
1340 | /* DW_LNS_copy */ | |
1341 | len += 1; | |
1342 | ||
1343 | return len; | |
1344 | } | |
1345 | ||
1346 | static void | |
1347 | emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, | |
1348 | char *p, int len) | |
1349 | { | |
91d6fa6a | 1350 | expressionS *pexp; |
7ddd14de BW |
1351 | char *end = p + len; |
1352 | ||
1353 | /* Line number sequences cannot go backward in addresses. This means | |
1354 | we've incorrectly ordered the statements in the sequence. */ | |
9c2799c2 | 1355 | gas_assert ((offsetT) addr_delta >= 0); |
7ddd14de | 1356 | |
b40bf0a2 NC |
1357 | /* Verify that we have kept in sync with size_fixed_inc_line_addr. */ |
1358 | gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta)); | |
1359 | ||
7ddd14de BW |
1360 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
1361 | if (line_delta != INT_MAX) | |
1362 | { | |
1363 | *p++ = DW_LNS_advance_line; | |
1364 | p += output_leb128 (p, line_delta, 1); | |
1365 | } | |
1366 | ||
91d6fa6a | 1367 | pexp = symbol_get_value_expression (frag->fr_symbol); |
7ddd14de BW |
1368 | |
1369 | /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can | |
1370 | advance the address by at most 64K. Linker relaxation (without | |
1371 | which this function would not be used) could change the operand by | |
1372 | an unknown amount. If the address increment is getting close to | |
1373 | the limit, just reset the address. */ | |
453dc3f0 | 1374 | if (addr_delta > ADDR_DELTA_LIMIT) |
1737851b | 1375 | { |
7ddd14de | 1376 | symbolS *to_sym; |
91d6fa6a | 1377 | expressionS exp; |
7ddd14de | 1378 | |
031e3350 | 1379 | memset (&exp, 0, sizeof exp); |
9f6db0d3 | 1380 | gas_assert (pexp->X_op == O_subtract); |
91d6fa6a | 1381 | to_sym = pexp->X_add_symbol; |
7ddd14de BW |
1382 | |
1383 | *p++ = DW_LNS_extended_op; | |
1384 | p += output_leb128 (p, sizeof_address + 1, 0); | |
1385 | *p++ = DW_LNE_set_address; | |
91d6fa6a NC |
1386 | exp.X_op = O_symbol; |
1387 | exp.X_add_symbol = to_sym; | |
1388 | exp.X_add_number = 0; | |
62ebcb5c | 1389 | emit_expr_fix (&exp, sizeof_address, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de BW |
1390 | p += sizeof_address; |
1391 | } | |
1392 | else | |
1393 | { | |
1394 | *p++ = DW_LNS_fixed_advance_pc; | |
62ebcb5c | 1395 | emit_expr_fix (pexp, 2, frag, p, TC_PARSE_CONS_RETURN_NONE); |
7ddd14de | 1396 | p += 2; |
1737851b BW |
1397 | } |
1398 | ||
7ddd14de BW |
1399 | if (line_delta == INT_MAX) |
1400 | { | |
1401 | *p++ = DW_LNS_extended_op; | |
1402 | *p++ = 1; | |
1403 | *p++ = DW_LNE_end_sequence; | |
1404 | } | |
1405 | else | |
1406 | *p++ = DW_LNS_copy; | |
1737851b | 1407 | |
9c2799c2 | 1408 | gas_assert (p == end); |
1737851b BW |
1409 | } |
1410 | ||
220e750f RH |
1411 | /* Generate a variant frag that we can use to relax address/line |
1412 | increments between fragments of the target segment. */ | |
9e3af0e7 | 1413 | |
220e750f | 1414 | static void |
07a53e5c | 1415 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
220e750f | 1416 | { |
91d6fa6a | 1417 | expressionS exp; |
220e750f | 1418 | int max_chars; |
6576f0b5 | 1419 | |
031e3350 | 1420 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
1421 | exp.X_op = O_subtract; |
1422 | exp.X_add_symbol = to_sym; | |
1423 | exp.X_op_symbol = from_sym; | |
1424 | exp.X_add_number = 0; | |
fac0d250 | 1425 | |
220e750f RH |
1426 | /* The maximum size of the frag is the line delta with a maximum |
1427 | sized address delta. */ | |
7ddd14de BW |
1428 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1429 | max_chars = size_fixed_inc_line_addr (line_delta, | |
1430 | -DWARF2_LINE_MIN_INSN_LENGTH); | |
1431 | else | |
1432 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); | |
fac0d250 | 1433 | |
220e750f | 1434 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
91d6fa6a | 1435 | make_expr_symbol (&exp), line_delta, NULL); |
220e750f | 1436 | } |
fac0d250 | 1437 | |
220e750f RH |
1438 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
1439 | based on the current values of the symbols. It is called before | |
1440 | the relaxation loop. We set fr_subtype to the expected length. */ | |
fac0d250 | 1441 | |
220e750f | 1442 | int |
a2e22468 | 1443 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
220e750f RH |
1444 | { |
1445 | offsetT addr_delta; | |
1446 | int size; | |
fac0d250 | 1447 | |
6386f3a7 | 1448 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
7ddd14de BW |
1449 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1450 | size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); | |
1451 | else | |
1452 | size = size_inc_line_addr (frag->fr_offset, addr_delta); | |
fac0d250 | 1453 | |
220e750f | 1454 | frag->fr_subtype = size; |
fac0d250 | 1455 | |
220e750f RH |
1456 | return size; |
1457 | } | |
1458 | ||
1459 | /* This function relaxes a rs_dwarf2dbg variant frag based on the | |
1460 | current values of the symbols. fr_subtype is the current length | |
1461 | of the frag. This returns the change in frag length. */ | |
1462 | ||
1463 | int | |
a2e22468 | 1464 | dwarf2dbg_relax_frag (fragS *frag) |
220e750f RH |
1465 | { |
1466 | int old_size, new_size; | |
fac0d250 | 1467 | |
220e750f RH |
1468 | old_size = frag->fr_subtype; |
1469 | new_size = dwarf2dbg_estimate_size_before_relax (frag); | |
ee515fb7 | 1470 | |
220e750f | 1471 | return new_size - old_size; |
fac0d250 RH |
1472 | } |
1473 | ||
220e750f RH |
1474 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
1475 | fill frag. This is called after all relaxation has been done. | |
1476 | fr_subtype will be the desired length of the frag. */ | |
1477 | ||
1478 | void | |
a2e22468 | 1479 | dwarf2dbg_convert_frag (fragS *frag) |
fac0d250 | 1480 | { |
220e750f RH |
1481 | offsetT addr_diff; |
1482 | ||
453dc3f0 NC |
1483 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1484 | { | |
2b0f3761 | 1485 | /* If linker relaxation is enabled then the distance between the two |
453dc3f0 NC |
1486 | symbols in the frag->fr_symbol expression might change. Hence we |
1487 | cannot rely upon the value computed by resolve_symbol_value. | |
1488 | Instead we leave the expression unfinalized and allow | |
1489 | emit_fixed_inc_line_addr to create a fixup (which later becomes a | |
1490 | relocation) that will allow the linker to correctly compute the | |
1491 | actual address difference. We have to use a fixed line advance for | |
1492 | this as we cannot (easily) relocate leb128 encoded values. */ | |
1493 | int saved_finalize_syms = finalize_syms; | |
1494 | ||
1495 | finalize_syms = 0; | |
1496 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
1497 | finalize_syms = saved_finalize_syms; | |
1498 | } | |
1499 | else | |
1500 | addr_diff = resolve_symbol_value (frag->fr_symbol); | |
fac0d250 | 1501 | |
220e750f RH |
1502 | /* fr_var carries the max_chars that we created the fragment with. |
1503 | fr_subtype carries the current expected length. We must, of | |
1504 | course, have allocated enough memory earlier. */ | |
9c2799c2 | 1505 | gas_assert (frag->fr_var >= (int) frag->fr_subtype); |
fac0d250 | 1506 | |
7ddd14de BW |
1507 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
1508 | emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, | |
1509 | frag->fr_literal + frag->fr_fix, | |
1510 | frag->fr_subtype); | |
1511 | else | |
1512 | emit_inc_line_addr (frag->fr_offset, addr_diff, | |
1513 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); | |
220e750f RH |
1514 | |
1515 | frag->fr_fix += frag->fr_subtype; | |
1516 | frag->fr_type = rs_fill; | |
1517 | frag->fr_var = 0; | |
1518 | frag->fr_offset = 0; | |
1519 | } | |
1520 | ||
1521 | /* Generate .debug_line content for the chain of line number entries | |
1522 | beginning at E, for segment SEG. */ | |
1523 | ||
1524 | static void | |
a2e22468 | 1525 | process_entries (segT seg, struct line_entry *e) |
220e750f RH |
1526 | { |
1527 | unsigned filenum = 1; | |
1528 | unsigned line = 1; | |
1529 | unsigned column = 0; | |
bd0eb99b RH |
1530 | unsigned isa = 0; |
1531 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; | |
07a53e5c RH |
1532 | fragS *last_frag = NULL, *frag; |
1533 | addressT last_frag_ofs = 0, frag_ofs; | |
fead5cd9 | 1534 | symbolS *last_lab = NULL, *lab; |
220e750f RH |
1535 | struct line_entry *next; |
1536 | ||
b40bf0a2 NC |
1537 | if (flag_dwarf_sections) |
1538 | { | |
1539 | char * name; | |
1540 | const char * sec_name; | |
1541 | ||
2b0f3761 | 1542 | /* Switch to the relevant sub-section before we start to emit |
b40bf0a2 NC |
1543 | the line number table. |
1544 | ||
1545 | FIXME: These sub-sections do not have a normal Line Number | |
1546 | Program Header, thus strictly speaking they are not valid | |
1547 | DWARF sections. Unfortunately the DWARF standard assumes | |
1548 | a one-to-one relationship between compilation units and | |
1549 | line number tables. Thus we have to have a .debug_line | |
1550 | section, as well as our sub-sections, and we have to ensure | |
1551 | that all of the sub-sections are merged into a proper | |
1552 | .debug_line section before a debugger sees them. */ | |
3739860c | 1553 | |
b40bf0a2 NC |
1554 | sec_name = bfd_get_section_name (stdoutput, seg); |
1555 | if (strcmp (sec_name, ".text") != 0) | |
1556 | { | |
29a2809e | 1557 | name = concat (".debug_line", sec_name, (char *) NULL); |
b40bf0a2 NC |
1558 | subseg_set (subseg_get (name, FALSE), 0); |
1559 | } | |
1560 | else | |
1561 | /* Don't create a .debug_line.text section - | |
1562 | that is redundant. Instead just switch back to the | |
1563 | normal .debug_line section. */ | |
1564 | subseg_set (subseg_get (".debug_line", FALSE), 0); | |
1565 | } | |
1566 | ||
fead5cd9 | 1567 | do |
fac0d250 | 1568 | { |
07a53e5c | 1569 | int line_delta; |
220e750f RH |
1570 | |
1571 | if (filenum != e->loc.filenum) | |
fac0d250 | 1572 | { |
220e750f RH |
1573 | filenum = e->loc.filenum; |
1574 | out_opcode (DW_LNS_set_file); | |
1575 | out_uleb128 (filenum); | |
220e750f RH |
1576 | } |
1577 | ||
1578 | if (column != e->loc.column) | |
1579 | { | |
1580 | column = e->loc.column; | |
1581 | out_opcode (DW_LNS_set_column); | |
1582 | out_uleb128 (column); | |
220e750f RH |
1583 | } |
1584 | ||
92846e72 CC |
1585 | if (e->loc.discriminator != 0) |
1586 | { | |
1587 | out_opcode (DW_LNS_extended_op); | |
1588 | out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); | |
1589 | out_opcode (DW_LNE_set_discriminator); | |
1590 | out_uleb128 (e->loc.discriminator); | |
1591 | } | |
1592 | ||
bd0eb99b RH |
1593 | if (isa != e->loc.isa) |
1594 | { | |
1595 | isa = e->loc.isa; | |
1596 | out_opcode (DW_LNS_set_isa); | |
1597 | out_uleb128 (isa); | |
bd0eb99b RH |
1598 | } |
1599 | ||
1600 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT) | |
220e750f RH |
1601 | { |
1602 | flags = e->loc.flags; | |
1603 | out_opcode (DW_LNS_negate_stmt); | |
220e750f RH |
1604 | } |
1605 | ||
bd0eb99b | 1606 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) |
07a53e5c | 1607 | out_opcode (DW_LNS_set_basic_block); |
220e750f | 1608 | |
bd0eb99b | 1609 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) |
07a53e5c | 1610 | out_opcode (DW_LNS_set_prologue_end); |
bd0eb99b RH |
1611 | |
1612 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) | |
07a53e5c | 1613 | out_opcode (DW_LNS_set_epilogue_begin); |
bd0eb99b | 1614 | |
fb81275c JM |
1615 | /* Don't try to optimize away redundant entries; gdb wants two |
1616 | entries for a function where the code starts on the same line as | |
1617 | the {, and there's no way to identify that case here. Trust gcc | |
1618 | to optimize appropriately. */ | |
07a53e5c RH |
1619 | line_delta = e->loc.line - line; |
1620 | lab = e->label; | |
1621 | frag = symbol_get_frag (lab); | |
1622 | frag_ofs = S_GET_VALUE (lab); | |
220e750f | 1623 | |
ba8826a8 AO |
1624 | if (last_frag == NULL |
1625 | || (e->loc.view == force_reset_view && force_reset_view | |
1626 | /* If we're going to reset the view, but we know we're | |
1627 | advancing the PC, we don't have to force with | |
1628 | set_address. We know we do when we're at the same | |
1629 | address of the same frag, and we know we might when | |
1630 | we're in the beginning of a frag, and we were at the | |
1631 | end of the previous frag. */ | |
1632 | && (frag == last_frag | |
1633 | ? (last_frag_ofs == frag_ofs) | |
1634 | : (frag_ofs == 0 | |
1635 | && ((offsetT)last_frag_ofs | |
1636 | >= get_frag_fix (last_frag, seg)))))) | |
220e750f | 1637 | { |
07a53e5c RH |
1638 | out_set_addr (lab); |
1639 | out_inc_line_addr (line_delta, 0); | |
220e750f | 1640 | } |
7ddd14de | 1641 | else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c RH |
1642 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
1643 | else | |
1644 | relax_inc_line_addr (line_delta, lab, last_lab); | |
1645 | ||
1646 | line = e->loc.line; | |
1647 | last_lab = lab; | |
1648 | last_frag = frag; | |
1649 | last_frag_ofs = frag_ofs; | |
220e750f RH |
1650 | |
1651 | next = e->next; | |
1652 | free (e); | |
1653 | e = next; | |
fac0d250 | 1654 | } |
fead5cd9 | 1655 | while (e); |
353e2c69 | 1656 | |
220e750f | 1657 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
07a53e5c | 1658 | frag = last_frag_for_seg (seg); |
c9049d30 | 1659 | frag_ofs = get_frag_fix (frag, seg); |
7ddd14de | 1660 | if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
07a53e5c | 1661 | out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); |
220e750f | 1662 | else |
07a53e5c RH |
1663 | { |
1664 | lab = symbol_temp_new (seg, frag_ofs, frag); | |
1665 | relax_inc_line_addr (INT_MAX, lab, last_lab); | |
1666 | } | |
fac0d250 RH |
1667 | } |
1668 | ||
220e750f RH |
1669 | /* Emit the directory and file tables for .debug_line. */ |
1670 | ||
fac0d250 | 1671 | static void |
a2e22468 | 1672 | out_file_list (void) |
fac0d250 RH |
1673 | { |
1674 | size_t size; | |
3d6b762c | 1675 | const char *dir; |
fac0d250 | 1676 | char *cp; |
220e750f RH |
1677 | unsigned int i; |
1678 | ||
a7ed1ca2 NC |
1679 | /* Emit directory list. */ |
1680 | for (i = 1; i < dirs_in_use; ++i) | |
1681 | { | |
3d6b762c JM |
1682 | dir = remap_debug_filename (dirs[i]); |
1683 | size = strlen (dir) + 1; | |
a7ed1ca2 | 1684 | cp = frag_more (size); |
3d6b762c | 1685 | memcpy (cp, dir, size); |
a7ed1ca2 NC |
1686 | } |
1687 | /* Terminate it. */ | |
220e750f | 1688 | out_byte ('\0'); |
fac0d250 | 1689 | |
220e750f | 1690 | for (i = 1; i < files_in_use; ++i) |
fac0d250 | 1691 | { |
01e1a5bc NC |
1692 | const char *fullfilename; |
1693 | ||
249e3833 RH |
1694 | if (files[i].filename == NULL) |
1695 | { | |
0e389e77 | 1696 | as_bad (_("unassigned file number %ld"), (long) i); |
88b4ca40 RH |
1697 | /* Prevent a crash later, particularly for file 1. */ |
1698 | files[i].filename = ""; | |
249e3833 RH |
1699 | continue; |
1700 | } | |
1701 | ||
01e1a5bc NC |
1702 | fullfilename = DWARF2_FILE_NAME (files[i].filename, |
1703 | files[i].dir ? dirs [files [i].dir] : ""); | |
1704 | size = strlen (fullfilename) + 1; | |
fac0d250 | 1705 | cp = frag_more (size); |
01e1a5bc | 1706 | memcpy (cp, fullfilename, size); |
fac0d250 | 1707 | |
220e750f | 1708 | out_uleb128 (files[i].dir); /* directory number */ |
01e1a5bc NC |
1709 | /* Output the last modification timestamp. */ |
1710 | out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, | |
1711 | files[i].dir ? dirs [files [i].dir] : "")); | |
1712 | /* Output the filesize. */ | |
1713 | out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, | |
1714 | files[i].dir ? dirs [files [i].dir] : "")); | |
fac0d250 | 1715 | } |
353e2c69 KH |
1716 | |
1717 | /* Terminate filename list. */ | |
1718 | out_byte (0); | |
fac0d250 RH |
1719 | } |
1720 | ||
413a266c AM |
1721 | /* Switch to SEC and output a header length field. Return the size of |
1722 | offsets used in SEC. The caller must set EXPR->X_add_symbol value | |
d025d5e5 MW |
1723 | to the end of the section. EXPR->X_add_number will be set to the |
1724 | negative size of the header. */ | |
413a266c AM |
1725 | |
1726 | static int | |
91d6fa6a | 1727 | out_header (asection *sec, expressionS *exp) |
413a266c AM |
1728 | { |
1729 | symbolS *start_sym; | |
1730 | symbolS *end_sym; | |
1731 | ||
1732 | subseg_set (sec, 0); | |
b57dc16f | 1733 | |
0f8f0c57 NC |
1734 | if (flag_dwarf_sections) |
1735 | { | |
1736 | /* If we are going to put the start and end symbols in different | |
1737 | sections, then we need real symbols, not just fake, local ones. */ | |
1738 | frag_now_fix (); | |
1739 | start_sym = symbol_make (".Ldebug_line_start"); | |
1740 | end_sym = symbol_make (".Ldebug_line_end"); | |
1741 | symbol_set_value_now (start_sym); | |
1742 | } | |
1743 | else | |
0f8f0c57 NC |
1744 | { |
1745 | start_sym = symbol_temp_new_now (); | |
1746 | end_sym = symbol_temp_make (); | |
1747 | } | |
413a266c AM |
1748 | |
1749 | /* Total length of the information. */ | |
91d6fa6a NC |
1750 | exp->X_op = O_subtract; |
1751 | exp->X_add_symbol = end_sym; | |
1752 | exp->X_op_symbol = start_sym; | |
413a266c AM |
1753 | |
1754 | switch (DWARF2_FORMAT (sec)) | |
1755 | { | |
1756 | case dwarf2_format_32bit: | |
91d6fa6a NC |
1757 | exp->X_add_number = -4; |
1758 | emit_expr (exp, 4); | |
413a266c AM |
1759 | return 4; |
1760 | ||
1761 | case dwarf2_format_64bit: | |
91d6fa6a | 1762 | exp->X_add_number = -12; |
413a266c | 1763 | out_four (-1); |
91d6fa6a | 1764 | emit_expr (exp, 8); |
413a266c AM |
1765 | return 8; |
1766 | ||
1767 | case dwarf2_format_64bit_irix: | |
91d6fa6a NC |
1768 | exp->X_add_number = -8; |
1769 | emit_expr (exp, 8); | |
413a266c AM |
1770 | return 8; |
1771 | } | |
1772 | ||
1773 | as_fatal (_("internal error: unknown dwarf2 format")); | |
1774 | return 0; | |
1775 | } | |
1776 | ||
220e750f RH |
1777 | /* Emit the collected .debug_line data. */ |
1778 | ||
1779 | static void | |
a2e22468 | 1780 | out_debug_line (segT line_seg) |
220e750f | 1781 | { |
91d6fa6a | 1782 | expressionS exp; |
02fe846e | 1783 | symbolS *prologue_start, *prologue_end; |
220e750f RH |
1784 | symbolS *line_end; |
1785 | struct line_seg *s; | |
14e777e0 | 1786 | int sizeof_offset; |
220e750f | 1787 | |
031e3350 | 1788 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
1789 | sizeof_offset = out_header (line_seg, &exp); |
1790 | line_end = exp.X_add_symbol; | |
220e750f RH |
1791 | |
1792 | /* Version. */ | |
88ebb0a1 | 1793 | out_two (DWARF2_LINE_VERSION); |
220e750f RH |
1794 | |
1795 | /* Length of the prologue following this length. */ | |
02fe846e | 1796 | prologue_start = symbol_temp_make (); |
413a266c | 1797 | prologue_end = symbol_temp_make (); |
02fe846e | 1798 | exp.X_op = O_subtract; |
91d6fa6a | 1799 | exp.X_add_symbol = prologue_end; |
02fe846e AM |
1800 | exp.X_op_symbol = prologue_start; |
1801 | exp.X_add_number = 0; | |
91d6fa6a | 1802 | emit_expr (&exp, sizeof_offset); |
02fe846e | 1803 | symbol_set_value_now (prologue_start); |
220e750f RH |
1804 | |
1805 | /* Parameters of the state machine. */ | |
1806 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); | |
1807 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); | |
1808 | out_byte (DWARF2_LINE_BASE); | |
1809 | out_byte (DWARF2_LINE_RANGE); | |
1810 | out_byte (DWARF2_LINE_OPCODE_BASE); | |
1811 | ||
1812 | /* Standard opcode lengths. */ | |
1813 | out_byte (0); /* DW_LNS_copy */ | |
1814 | out_byte (1); /* DW_LNS_advance_pc */ | |
1815 | out_byte (1); /* DW_LNS_advance_line */ | |
1816 | out_byte (1); /* DW_LNS_set_file */ | |
1817 | out_byte (1); /* DW_LNS_set_column */ | |
1818 | out_byte (0); /* DW_LNS_negate_stmt */ | |
1819 | out_byte (0); /* DW_LNS_set_basic_block */ | |
1820 | out_byte (0); /* DW_LNS_const_add_pc */ | |
1821 | out_byte (1); /* DW_LNS_fixed_advance_pc */ | |
bd0eb99b RH |
1822 | out_byte (0); /* DW_LNS_set_prologue_end */ |
1823 | out_byte (0); /* DW_LNS_set_epilogue_begin */ | |
1824 | out_byte (1); /* DW_LNS_set_isa */ | |
220e750f RH |
1825 | |
1826 | out_file_list (); | |
1827 | ||
b7d6ed97 | 1828 | symbol_set_value_now (prologue_end); |
220e750f RH |
1829 | |
1830 | /* For each section, emit a statement program. */ | |
ee515fb7 | 1831 | for (s = all_segs; s; s = s->next) |
9aec2026 NC |
1832 | if (SEG_NORMAL (s->seg)) |
1833 | process_entries (s->seg, s->head->head); | |
1834 | else | |
1835 | as_warn ("dwarf line number information for %s ignored", | |
1836 | segment_name (s->seg)); | |
220e750f | 1837 | |
b40bf0a2 NC |
1838 | if (flag_dwarf_sections) |
1839 | /* We have to switch to the special .debug_line_end section | |
1840 | before emitting the end-of-debug_line symbol. The linker | |
1841 | script arranges for this section to be placed after all the | |
1842 | (potentially garbage collected) .debug_line.<foo> sections. | |
1843 | This section contains the line_end symbol which is used to | |
1844 | compute the size of the linked .debug_line section, as seen | |
1845 | in the DWARF Line Number header. */ | |
1846 | subseg_set (subseg_get (".debug_line_end", FALSE), 0); | |
1847 | ||
b7d6ed97 | 1848 | symbol_set_value_now (line_end); |
220e750f RH |
1849 | } |
1850 | ||
802f5d9e NC |
1851 | static void |
1852 | out_debug_ranges (segT ranges_seg) | |
1853 | { | |
1854 | unsigned int addr_size = sizeof_address; | |
1855 | struct line_seg *s; | |
91d6fa6a | 1856 | expressionS exp; |
802f5d9e NC |
1857 | unsigned int i; |
1858 | ||
031e3350 | 1859 | memset (&exp, 0, sizeof exp); |
802f5d9e NC |
1860 | subseg_set (ranges_seg, 0); |
1861 | ||
1862 | /* Base Address Entry. */ | |
7fd3924a | 1863 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1864 | out_byte (0xff); |
7fd3924a | 1865 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1866 | out_byte (0); |
1867 | ||
1868 | /* Range List Entry. */ | |
1869 | for (s = all_segs; s; s = s->next) | |
1870 | { | |
1871 | fragS *frag; | |
1872 | symbolS *beg, *end; | |
1873 | ||
1874 | frag = first_frag_for_seg (s->seg); | |
1875 | beg = symbol_temp_new (s->seg, 0, frag); | |
1876 | s->text_start = beg; | |
1877 | ||
1878 | frag = last_frag_for_seg (s->seg); | |
1879 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); | |
1880 | s->text_end = end; | |
1881 | ||
91d6fa6a NC |
1882 | exp.X_op = O_symbol; |
1883 | exp.X_add_symbol = beg; | |
1884 | exp.X_add_number = 0; | |
1885 | emit_expr (&exp, addr_size); | |
802f5d9e | 1886 | |
91d6fa6a NC |
1887 | exp.X_op = O_symbol; |
1888 | exp.X_add_symbol = end; | |
1889 | exp.X_add_number = 0; | |
1890 | emit_expr (&exp, addr_size); | |
802f5d9e NC |
1891 | } |
1892 | ||
1893 | /* End of Range Entry. */ | |
7fd3924a | 1894 | for (i = 0; i < addr_size; i++) |
802f5d9e | 1895 | out_byte (0); |
7fd3924a | 1896 | for (i = 0; i < addr_size; i++) |
802f5d9e NC |
1897 | out_byte (0); |
1898 | } | |
1899 | ||
220e750f RH |
1900 | /* Emit data for .debug_aranges. */ |
1901 | ||
58b5739a | 1902 | static void |
a2e22468 | 1903 | out_debug_aranges (segT aranges_seg, segT info_seg) |
fac0d250 | 1904 | { |
220e750f | 1905 | unsigned int addr_size = sizeof_address; |
d025d5e5 | 1906 | offsetT size; |
220e750f | 1907 | struct line_seg *s; |
91d6fa6a | 1908 | expressionS exp; |
413a266c | 1909 | symbolS *aranges_end; |
220e750f | 1910 | char *p; |
413a266c | 1911 | int sizeof_offset; |
fac0d250 | 1912 | |
031e3350 | 1913 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
1914 | sizeof_offset = out_header (aranges_seg, &exp); |
1915 | aranges_end = exp.X_add_symbol; | |
d025d5e5 | 1916 | size = -exp.X_add_number; |
fac0d250 | 1917 | |
220e750f | 1918 | /* Version. */ |
88ebb0a1 | 1919 | out_two (DWARF2_ARANGES_VERSION); |
d025d5e5 | 1920 | size += 2; |
4dc7ead9 | 1921 | |
220e750f | 1922 | /* Offset to .debug_info. */ |
413a266c | 1923 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); |
d025d5e5 | 1924 | size += sizeof_offset; |
220e750f RH |
1925 | |
1926 | /* Size of an address (offset portion). */ | |
1927 | out_byte (addr_size); | |
d025d5e5 | 1928 | size++; |
220e750f RH |
1929 | |
1930 | /* Size of a segment descriptor. */ | |
1931 | out_byte (0); | |
d025d5e5 | 1932 | size++; |
220e750f RH |
1933 | |
1934 | /* Align the header. */ | |
d025d5e5 MW |
1935 | while ((size++ % (2 * addr_size)) > 0) |
1936 | out_byte (0); | |
4dc7ead9 | 1937 | |
ee515fb7 | 1938 | for (s = all_segs; s; s = s->next) |
220e750f RH |
1939 | { |
1940 | fragS *frag; | |
1941 | symbolS *beg, *end; | |
1942 | ||
1943 | frag = first_frag_for_seg (s->seg); | |
b7d6ed97 | 1944 | beg = symbol_temp_new (s->seg, 0, frag); |
220e750f RH |
1945 | s->text_start = beg; |
1946 | ||
1947 | frag = last_frag_for_seg (s->seg); | |
c9049d30 | 1948 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
220e750f RH |
1949 | s->text_end = end; |
1950 | ||
91d6fa6a NC |
1951 | exp.X_op = O_symbol; |
1952 | exp.X_add_symbol = beg; | |
1953 | exp.X_add_number = 0; | |
1954 | emit_expr (&exp, addr_size); | |
220e750f | 1955 | |
91d6fa6a NC |
1956 | exp.X_op = O_subtract; |
1957 | exp.X_add_symbol = end; | |
1958 | exp.X_op_symbol = beg; | |
1959 | exp.X_add_number = 0; | |
1960 | emit_expr (&exp, addr_size); | |
220e750f | 1961 | } |
4dc7ead9 | 1962 | |
220e750f RH |
1963 | p = frag_more (2 * addr_size); |
1964 | md_number_to_chars (p, 0, addr_size); | |
1965 | md_number_to_chars (p + addr_size, 0, addr_size); | |
413a266c AM |
1966 | |
1967 | symbol_set_value_now (aranges_end); | |
4dc7ead9 RH |
1968 | } |
1969 | ||
220e750f RH |
1970 | /* Emit data for .debug_abbrev. Note that this must be kept in |
1971 | sync with out_debug_info below. */ | |
fac0d250 | 1972 | |
220e750f | 1973 | static void |
413a266c AM |
1974 | out_debug_abbrev (segT abbrev_seg, |
1975 | segT info_seg ATTRIBUTE_UNUSED, | |
1976 | segT line_seg ATTRIBUTE_UNUSED) | |
220e750f RH |
1977 | { |
1978 | subseg_set (abbrev_seg, 0); | |
fac0d250 | 1979 | |
220e750f RH |
1980 | out_uleb128 (1); |
1981 | out_uleb128 (DW_TAG_compile_unit); | |
1982 | out_byte (DW_CHILDREN_no); | |
413a266c AM |
1983 | if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) |
1984 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); | |
1985 | else | |
1986 | out_abbrev (DW_AT_stmt_list, DW_FORM_data8); | |
220e750f | 1987 | if (all_segs->next == NULL) |
4dc7ead9 | 1988 | { |
220e750f | 1989 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
88ebb0a1 MW |
1990 | if (DWARF2_VERSION < 4) |
1991 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); | |
1992 | else | |
1993 | out_abbrev (DW_AT_high_pc, (sizeof_address == 4 | |
1994 | ? DW_FORM_data4 : DW_FORM_data8)); | |
220e750f | 1995 | } |
802f5d9e NC |
1996 | else |
1997 | { | |
413a266c | 1998 | if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) |
802f5d9e NC |
1999 | out_abbrev (DW_AT_ranges, DW_FORM_data4); |
2000 | else | |
2001 | out_abbrev (DW_AT_ranges, DW_FORM_data8); | |
2002 | } | |
49fced12 MW |
2003 | out_abbrev (DW_AT_name, DW_FORM_strp); |
2004 | out_abbrev (DW_AT_comp_dir, DW_FORM_strp); | |
2005 | out_abbrev (DW_AT_producer, DW_FORM_strp); | |
220e750f RH |
2006 | out_abbrev (DW_AT_language, DW_FORM_data2); |
2007 | out_abbrev (0, 0); | |
a987bfc9 RH |
2008 | |
2009 | /* Terminate the abbreviations for this compilation unit. */ | |
2010 | out_byte (0); | |
220e750f | 2011 | } |
4dc7ead9 | 2012 | |
220e750f | 2013 | /* Emit a description of this compilation unit for .debug_info. */ |
4dc7ead9 | 2014 | |
220e750f | 2015 | static void |
49fced12 MW |
2016 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg, |
2017 | symbolS *name_sym, symbolS *comp_dir_sym, symbolS *producer_sym) | |
220e750f | 2018 | { |
91d6fa6a | 2019 | expressionS exp; |
220e750f | 2020 | symbolS *info_end; |
14e777e0 | 2021 | int sizeof_offset; |
4dc7ead9 | 2022 | |
031e3350 | 2023 | memset (&exp, 0, sizeof exp); |
91d6fa6a NC |
2024 | sizeof_offset = out_header (info_seg, &exp); |
2025 | info_end = exp.X_add_symbol; | |
4dc7ead9 | 2026 | |
220e750f | 2027 | /* DWARF version. */ |
fc0eebac | 2028 | out_two (DWARF2_VERSION); |
4dc7ead9 | 2029 | |
220e750f | 2030 | /* .debug_abbrev offset */ |
6174d9c8 | 2031 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
4dc7ead9 | 2032 | |
220e750f RH |
2033 | /* Target address size. */ |
2034 | out_byte (sizeof_address); | |
fac0d250 | 2035 | |
220e750f RH |
2036 | /* DW_TAG_compile_unit DIE abbrev */ |
2037 | out_uleb128 (1); | |
fac0d250 | 2038 | |
220e750f | 2039 | /* DW_AT_stmt_list */ |
413a266c AM |
2040 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), |
2041 | (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit | |
2042 | ? 4 : 8)); | |
fac0d250 | 2043 | |
802f5d9e | 2044 | /* These two attributes are emitted if all of the code is contiguous. */ |
220e750f | 2045 | if (all_segs->next == NULL) |
58b5739a | 2046 | { |
220e750f | 2047 | /* DW_AT_low_pc */ |
91d6fa6a NC |
2048 | exp.X_op = O_symbol; |
2049 | exp.X_add_symbol = all_segs->text_start; | |
2050 | exp.X_add_number = 0; | |
2051 | emit_expr (&exp, sizeof_address); | |
220e750f RH |
2052 | |
2053 | /* DW_AT_high_pc */ | |
88ebb0a1 MW |
2054 | if (DWARF2_VERSION < 4) |
2055 | exp.X_op = O_symbol; | |
2056 | else | |
2057 | { | |
2058 | exp.X_op = O_subtract; | |
2059 | exp.X_op_symbol = all_segs->text_start; | |
2060 | } | |
91d6fa6a NC |
2061 | exp.X_add_symbol = all_segs->text_end; |
2062 | exp.X_add_number = 0; | |
2063 | emit_expr (&exp, sizeof_address); | |
58b5739a | 2064 | } |
802f5d9e NC |
2065 | else |
2066 | { | |
eb1fe072 NC |
2067 | /* This attribute is emitted if the code is disjoint. */ |
2068 | /* DW_AT_ranges. */ | |
2069 | TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); | |
802f5d9e | 2070 | } |
58b5739a | 2071 | |
49fced12 MW |
2072 | /* DW_AT_name, DW_AT_comp_dir and DW_AT_producer. Symbols in .debug_str |
2073 | setup in out_debug_str below. */ | |
2074 | TC_DWARF2_EMIT_OFFSET (name_sym, sizeof_offset); | |
2075 | TC_DWARF2_EMIT_OFFSET (comp_dir_sym, sizeof_offset); | |
2076 | TC_DWARF2_EMIT_OFFSET (producer_sym, sizeof_offset); | |
2077 | ||
2078 | /* DW_AT_language. Yes, this is probably not really MIPS, but the | |
2079 | dwarf2 draft has no standard code for assembler. */ | |
2080 | out_two (DW_LANG_Mips_Assembler); | |
2081 | ||
2082 | symbol_set_value_now (info_end); | |
2083 | } | |
2084 | ||
2085 | /* Emit the three debug strings needed in .debug_str and setup symbols | |
2086 | to them for use in out_debug_info. */ | |
2087 | static void | |
2088 | out_debug_str (segT str_seg, symbolS **name_sym, symbolS **comp_dir_sym, | |
2089 | symbolS **producer_sym) | |
2090 | { | |
2091 | char producer[128]; | |
2092 | const char *comp_dir; | |
2093 | const char *dirname; | |
2094 | char *p; | |
2095 | int len; | |
2096 | ||
2097 | subseg_set (str_seg, 0); | |
2098 | ||
48b91938 RH |
2099 | /* DW_AT_name. We don't have the actual file name that was present |
2100 | on the command line, so assume files[1] is the main input file. | |
2101 | We're not supposed to get called unless at least one line number | |
2102 | entry was emitted, so this should always be defined. */ | |
49fced12 | 2103 | *name_sym = symbol_temp_new_now (); |
7fd3924a | 2104 | if (files_in_use == 0) |
48b91938 | 2105 | abort (); |
a7ed1ca2 NC |
2106 | if (files[1].dir) |
2107 | { | |
3d6b762c JM |
2108 | dirname = remap_debug_filename (dirs[files[1].dir]); |
2109 | len = strlen (dirname); | |
198f1251 TG |
2110 | #ifdef TE_VMS |
2111 | /* Already has trailing slash. */ | |
2112 | p = frag_more (len); | |
2113 | memcpy (p, dirname, len); | |
2114 | #else | |
a7ed1ca2 | 2115 | p = frag_more (len + 1); |
3d6b762c | 2116 | memcpy (p, dirname, len); |
56487c55 | 2117 | INSERT_DIR_SEPARATOR (p, len); |
198f1251 | 2118 | #endif |
a7ed1ca2 | 2119 | } |
48b91938 RH |
2120 | len = strlen (files[1].filename) + 1; |
2121 | p = frag_more (len); | |
2122 | memcpy (p, files[1].filename, len); | |
2123 | ||
220e750f | 2124 | /* DW_AT_comp_dir */ |
49fced12 | 2125 | *comp_dir_sym = symbol_temp_new_now (); |
3d6b762c | 2126 | comp_dir = remap_debug_filename (getpwd ()); |
220e750f RH |
2127 | len = strlen (comp_dir) + 1; |
2128 | p = frag_more (len); | |
2129 | memcpy (p, comp_dir, len); | |
fac0d250 | 2130 | |
220e750f | 2131 | /* DW_AT_producer */ |
49fced12 | 2132 | *producer_sym = symbol_temp_new_now (); |
220e750f RH |
2133 | sprintf (producer, "GNU AS %s", VERSION); |
2134 | len = strlen (producer) + 1; | |
2135 | p = frag_more (len); | |
2136 | memcpy (p, producer, len); | |
fac0d250 RH |
2137 | } |
2138 | ||
1e9cc1c2 NC |
2139 | void |
2140 | dwarf2_init (void) | |
2141 | { | |
1e9cc1c2 NC |
2142 | last_seg_ptr = &all_segs; |
2143 | } | |
2144 | ||
2145 | ||
c6cb92c5 NS |
2146 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
2147 | were any .file/.loc directives, or --gdwarf2 was given, or if the | |
df1c40a7 L |
2148 | file has a non-empty .debug_info section and an empty .debug_line |
2149 | section. If we emit .debug_line, and the .debug_info section is | |
2150 | empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. | |
2151 | ALL_SEGS will be non-null if there were any .file/.loc directives, | |
2152 | or --gdwarf2 was given and there were any located instructions | |
2153 | emitted. */ | |
c6cb92c5 | 2154 | |
fac0d250 | 2155 | void |
a2e22468 | 2156 | dwarf2_finish (void) |
fac0d250 | 2157 | { |
220e750f RH |
2158 | segT line_seg; |
2159 | struct line_seg *s; | |
c6cb92c5 NS |
2160 | segT info_seg; |
2161 | int emit_other_sections = 0; | |
df1c40a7 | 2162 | int empty_debug_line = 0; |
c6cb92c5 NS |
2163 | |
2164 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); | |
2165 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); | |
fac0d250 | 2166 | |
df1c40a7 L |
2167 | line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); |
2168 | empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); | |
2169 | ||
2170 | /* We can't construct a new debug_line section if we already have one. | |
2171 | Give an error. */ | |
2172 | if (all_segs && !empty_debug_line) | |
2173 | as_fatal ("duplicate .debug_line sections"); | |
2174 | ||
2175 | if ((!all_segs && emit_other_sections) | |
2176 | || (!emit_other_sections && !empty_debug_line)) | |
2177 | /* If there is no line information and no non-empty .debug_info | |
2178 | section, or if there is both a non-empty .debug_info and a non-empty | |
2179 | .debug_line, then we do nothing. */ | |
220e750f | 2180 | return; |
fac0d250 | 2181 | |
220e750f | 2182 | /* Calculate the size of an address for the target machine. */ |
9605f328 | 2183 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
fac0d250 | 2184 | |
220e750f RH |
2185 | /* Create and switch to the line number section. */ |
2186 | line_seg = subseg_new (".debug_line", 0); | |
8a7140c3 | 2187 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
fac0d250 | 2188 | |
220e750f | 2189 | /* For each subsection, chain the debug entries together. */ |
ee515fb7 | 2190 | for (s = all_segs; s; s = s->next) |
fac0d250 | 2191 | { |
91d6fa6a NC |
2192 | struct line_subseg *lss = s->head; |
2193 | struct line_entry **ptail = lss->ptail; | |
220e750f | 2194 | |
91d6fa6a | 2195 | while ((lss = lss->next) != NULL) |
220e750f | 2196 | { |
91d6fa6a NC |
2197 | *ptail = lss->head; |
2198 | ptail = lss->ptail; | |
220e750f | 2199 | } |
fac0d250 | 2200 | } |
85a39694 | 2201 | |
220e750f | 2202 | out_debug_line (line_seg); |
85a39694 | 2203 | |
c6cb92c5 | 2204 | /* If this is assembler generated line info, and there is no |
49fced12 MW |
2205 | debug_info already, we need .debug_info, .debug_abbrev and |
2206 | .debug_str sections as well. */ | |
c6cb92c5 | 2207 | if (emit_other_sections) |
220e750f RH |
2208 | { |
2209 | segT abbrev_seg; | |
220e750f | 2210 | segT aranges_seg; |
802f5d9e | 2211 | segT ranges_seg; |
49fced12 MW |
2212 | segT str_seg; |
2213 | symbolS *name_sym, *comp_dir_sym, *producer_sym; | |
4dc7ead9 | 2214 | |
9c2799c2 | 2215 | gas_assert (all_segs); |
7fd3924a | 2216 | |
220e750f RH |
2217 | info_seg = subseg_new (".debug_info", 0); |
2218 | abbrev_seg = subseg_new (".debug_abbrev", 0); | |
2219 | aranges_seg = subseg_new (".debug_aranges", 0); | |
49fced12 | 2220 | str_seg = subseg_new (".debug_str", 0); |
ef99799a | 2221 | |
8a7140c3 NC |
2222 | bfd_set_section_flags (stdoutput, info_seg, |
2223 | SEC_READONLY | SEC_DEBUGGING); | |
2224 | bfd_set_section_flags (stdoutput, abbrev_seg, | |
2225 | SEC_READONLY | SEC_DEBUGGING); | |
2226 | bfd_set_section_flags (stdoutput, aranges_seg, | |
2227 | SEC_READONLY | SEC_DEBUGGING); | |
49fced12 MW |
2228 | bfd_set_section_flags (stdoutput, str_seg, |
2229 | (SEC_READONLY | SEC_DEBUGGING | |
2230 | | SEC_MERGE | SEC_STRINGS)); | |
2231 | str_seg->entsize = 1; | |
ef99799a | 2232 | |
ee515fb7 | 2233 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
ef99799a | 2234 | |
802f5d9e NC |
2235 | if (all_segs->next == NULL) |
2236 | ranges_seg = NULL; | |
2237 | else | |
2238 | { | |
2239 | ranges_seg = subseg_new (".debug_ranges", 0); | |
7fd3924a | 2240 | bfd_set_section_flags (stdoutput, ranges_seg, |
802f5d9e NC |
2241 | SEC_READONLY | SEC_DEBUGGING); |
2242 | record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); | |
2243 | out_debug_ranges (ranges_seg); | |
2244 | } | |
2245 | ||
220e750f | 2246 | out_debug_aranges (aranges_seg, info_seg); |
413a266c | 2247 | out_debug_abbrev (abbrev_seg, info_seg, line_seg); |
49fced12 MW |
2248 | out_debug_str (str_seg, &name_sym, &comp_dir_sym, &producer_sym); |
2249 | out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg, | |
2250 | name_sym, comp_dir_sym, producer_sym); | |
220e750f | 2251 | } |
85a39694 | 2252 | } |
ba8826a8 AO |
2253 | |
2254 | /* Perform any deferred checks pertaining to debug information. */ | |
2255 | ||
2256 | void | |
2257 | dwarf2dbg_final_check (void) | |
2258 | { | |
2259 | /* Perform reset-view checks. Don't evaluate view_assert_failed | |
2260 | recursively: it could be very deep. It's a chain of adds, with | |
2261 | each chain element pointing to the next in X_add_symbol, and | |
2262 | holding the check value in X_op_symbol. */ | |
2263 | while (view_assert_failed) | |
2264 | { | |
723dfee7 | 2265 | expressionS *exp; |
ba8826a8 AO |
2266 | symbolS *sym; |
2267 | offsetT failed; | |
2268 | ||
2269 | gas_assert (!symbol_resolved_p (view_assert_failed)); | |
2270 | ||
723dfee7 | 2271 | exp = symbol_get_value_expression (view_assert_failed); |
ba8826a8 AO |
2272 | sym = view_assert_failed; |
2273 | ||
2274 | /* If view_assert_failed looks like a compound check in the | |
2275 | chain, break it up. */ | |
723dfee7 | 2276 | if (exp->X_op == O_add && exp->X_add_number == 0 && exp->X_unsigned) |
ba8826a8 | 2277 | { |
723dfee7 HPN |
2278 | view_assert_failed = exp->X_add_symbol; |
2279 | sym = exp->X_op_symbol; | |
ba8826a8 AO |
2280 | } |
2281 | else | |
2282 | view_assert_failed = NULL; | |
2283 | ||
2284 | failed = resolve_symbol_value (sym); | |
2285 | if (!symbol_resolved_p (sym) || failed) | |
2286 | { | |
2287 | as_bad (_("view number mismatch")); | |
2288 | break; | |
2289 | } | |
2290 | } | |
2291 | } |