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625f4e48 KR |
1 | /* Generic stabs parsing for gas. |
2 | Copyright (C) 1989, 1990, 1991, 1993 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GAS, the GNU Assembler. | |
5 | ||
6 | GAS is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as | |
8 | published by the Free Software Foundation; either version 2, | |
9 | or (at your option) any later version. | |
10 | ||
11 | GAS is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
14 | the GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public | |
17 | License along with GAS; see the file COPYING. If not, write | |
18 | to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "as.h" | |
21 | #include "obstack.h" | |
22 | #include "subsegs.h" | |
23 | ||
24 | /* We need this, despite the apparent object format dependency, since | |
25 | it defines stab types, which all object formats can use now. */ | |
26 | ||
27 | #include "aout/stab_gnu.h" | |
28 | ||
29 | /* Allow backends to override the names used for the stab sections. */ | |
30 | #ifndef STAB_SECTION_NAME | |
31 | #define STAB_SECTION_NAME ".stab" | |
32 | #endif | |
33 | ||
34 | #ifndef STAB_STRING_SECTION_NAME | |
35 | #define STAB_STRING_SECTION_NAME ".stabstr" | |
36 | #endif | |
37 | ||
38 | /* | |
39 | * Handle .stabX directives, which used to be open-coded. | |
40 | * So much creeping featurism overloaded the semantics that we decided | |
41 | * to put all .stabX thinking in one place. Here. | |
42 | * | |
43 | * We try to make any .stabX directive legal. Other people's AS will often | |
44 | * do assembly-time consistency checks: eg assigning meaning to n_type bits | |
45 | * and "protecting" you from setting them to certain values. (They also zero | |
46 | * certain bits before emitting symbols. Tut tut.) | |
47 | * | |
48 | * If an expression is not absolute we either gripe or use the relocation | |
49 | * information. Other people's assemblers silently forget information they | |
50 | * don't need and invent information they need that you didn't supply. | |
51 | */ | |
52 | ||
53 | /* | |
54 | * Build a string dictionary entry for a .stabX symbol. | |
55 | * The symbol is added to the .<secname>str section. | |
56 | */ | |
57 | ||
58 | #ifndef SEPARATE_STAB_SECTIONS | |
59 | #define SEPARATE_STAB_SECTIONS 0 | |
60 | #endif | |
61 | ||
62 | unsigned int | |
63 | get_stab_string_offset (string, stabstr_secname) | |
64 | const char *string; | |
65 | const char *stabstr_secname; | |
66 | { | |
67 | unsigned int length; | |
68 | unsigned int retval; | |
69 | ||
70 | if (! SEPARATE_STAB_SECTIONS) | |
71 | abort (); | |
72 | ||
73 | retval = 0; | |
74 | length = strlen (string); | |
75 | if (length > 0) | |
76 | { /* Ordinary case. */ | |
77 | segT save_seg; | |
78 | subsegT save_subseg; | |
79 | char *newsecname; | |
80 | segT seg; | |
81 | char *p; | |
82 | ||
83 | save_seg = now_seg; | |
84 | save_subseg = now_subseg; | |
85 | ||
86 | /* Create the stab string section. */ | |
87 | newsecname = xmalloc ((unsigned long) (strlen (stabstr_secname) + 1)); | |
88 | strcpy (newsecname, stabstr_secname); | |
89 | ||
90 | seg = subseg_new (newsecname, 0); | |
91 | ||
92 | retval = seg_info (seg)->stabu.stab_string_size; | |
93 | if (retval > 0) | |
94 | free (newsecname); | |
95 | else | |
96 | { | |
97 | /* Make sure the first string is empty. */ | |
98 | p = frag_more (1); | |
99 | *p = 0; | |
100 | retval = seg_info (seg)->stabu.stab_string_size = 1; | |
101 | #ifdef BFD_ASSEMBLER | |
102 | bfd_set_section_flags (stdoutput, seg, SEC_READONLY | SEC_DEBUGGING); | |
103 | #else | |
104 | free (newsecname); | |
105 | #endif | |
106 | } | |
107 | ||
108 | p = frag_more (length + 1); | |
109 | strcpy (p, string); | |
110 | ||
111 | seg_info (seg)->stabu.stab_string_size += length + 1; | |
112 | ||
113 | subseg_set (save_seg, save_subseg); | |
114 | } | |
115 | ||
116 | return retval; | |
117 | } | |
118 | ||
119 | #ifdef AOUT_STABS | |
120 | #ifndef OBJ_PROCESS_STAB | |
121 | #define OBJ_PROCESS_STAB(SEG,W,S,T,O,D) aout_process_stab(W,S,T,O,D) | |
122 | #endif | |
123 | ||
124 | static void | |
125 | aout_process_stab (what, string, type, other, desc) | |
126 | int what; | |
127 | const char *string; | |
128 | int type, other, desc; | |
129 | { | |
130 | /* Put the stab information in the symbol table. */ | |
131 | symbolS *symbol; | |
132 | ||
133 | /* Create the symbol now, but only insert it into the symbol chain | |
134 | after any symbols mentioned in the value expression get into the | |
135 | symbol chain. This is to avoid "continuation symbols" (where one | |
136 | ends in "\" and the debug info is continued in the next .stabs | |
137 | directive) from being separated by other random symbols. */ | |
138 | symbol = symbol_create (string, undefined_section, 0, | |
139 | (struct frag *) NULL); | |
140 | if (what == 's' || what == 'n') | |
141 | { | |
142 | /* Pick up the value from the input line. */ | |
143 | symbol->sy_frag = &zero_address_frag; | |
144 | pseudo_set (symbol); | |
145 | } | |
146 | else | |
147 | { | |
148 | /* .stabd sets the name to NULL. Why? */ | |
149 | S_SET_NAME (symbol, NULL); | |
150 | symbol->sy_frag = frag_now; | |
151 | S_SET_VALUE (symbol, (valueT) frag_now_fix ()); | |
152 | } | |
153 | ||
154 | symbol_append (symbol, symbol_lastP, &symbol_rootP, &symbol_lastP); | |
155 | ||
156 | S_SET_TYPE (symbol, type); | |
157 | S_SET_OTHER (symbol, other); | |
158 | S_SET_DESC (symbol, desc); | |
159 | } | |
160 | #endif | |
161 | ||
162 | /* This can handle different kinds of stabs (s,n,d) and different | |
163 | kinds of stab sections. */ | |
164 | ||
165 | static void | |
166 | s_stab_generic (what, stab_secname, stabstr_secname) | |
167 | int what; | |
168 | char *stab_secname; | |
169 | char *stabstr_secname; | |
170 | { | |
171 | long longint; | |
172 | char *string; | |
173 | int type; | |
174 | int other; | |
175 | int desc; | |
176 | ||
177 | /* The general format is: | |
178 | .stabs "STRING",TYPE,OTHER,DESC,VALUE | |
179 | .stabn TYPE,OTHER,DESC,VALUE | |
180 | .stabd TYPE,OTHER,DESC | |
181 | At this point input_line_pointer points after the pseudo-op and | |
182 | any trailing whitespace. The argument what is one of 's', 'n' or | |
183 | 'd' indicating which type of .stab this is. */ | |
184 | ||
185 | if (what != 's') | |
186 | string = ""; | |
187 | else | |
188 | { | |
189 | int length; | |
190 | ||
191 | string = demand_copy_C_string (&length); | |
192 | SKIP_WHITESPACE (); | |
193 | if (*input_line_pointer == ',') | |
194 | input_line_pointer++; | |
195 | else | |
196 | { | |
197 | as_warn (".stabs: Missing comma"); | |
198 | ignore_rest_of_line (); | |
199 | return; | |
200 | } | |
201 | } | |
202 | ||
203 | if (get_absolute_expression_and_terminator (&longint) != ',') | |
204 | { | |
205 | as_warn (".stab%c: Missing comma", what); | |
206 | ignore_rest_of_line (); | |
207 | return; | |
208 | } | |
209 | type = longint; | |
210 | ||
211 | if (get_absolute_expression_and_terminator (&longint) != ',') | |
212 | { | |
213 | as_warn (".stab%c: Missing comma", what); | |
214 | ignore_rest_of_line (); | |
215 | return; | |
216 | } | |
217 | other = longint; | |
218 | ||
219 | desc = get_absolute_expression (); | |
220 | if (what == 's' || what == 'n') | |
221 | { | |
222 | if (*input_line_pointer != ',') | |
223 | { | |
224 | as_warn (".stab%c: Missing comma", what); | |
225 | ignore_rest_of_line (); | |
226 | return; | |
227 | } | |
228 | input_line_pointer++; | |
229 | SKIP_WHITESPACE (); | |
230 | } | |
231 | ||
232 | /* We have now gathered the type, other, and desc information. For | |
233 | .stabs or .stabn, input_line_pointer is now pointing at the | |
234 | value. */ | |
235 | ||
236 | if (SEPARATE_STAB_SECTIONS) | |
237 | /* Output the stab information in a separate section. This is used | |
238 | at least for COFF and ELF. */ | |
239 | { | |
240 | segT saved_seg = now_seg; | |
241 | subsegT saved_subseg = now_subseg; | |
242 | fragS *saved_frag = frag_now; | |
243 | valueT dot; | |
244 | segT seg; | |
245 | unsigned int stroff; | |
246 | char *p; | |
247 | ||
248 | dot = frag_now_fix (); | |
249 | ||
250 | seg = subseg_new (stab_secname, 0); | |
251 | ||
252 | if (! seg_info (seg)->hadone) | |
253 | { | |
254 | #ifdef BFD_ASSEMBLER | |
255 | bfd_set_section_flags (stdoutput, seg, | |
256 | SEC_READONLY | SEC_RELOC | SEC_DEBUGGING); | |
257 | #endif | |
258 | #ifdef INIT_STAB_SECTION | |
259 | INIT_STAB_SECTION (seg); | |
260 | #endif | |
261 | seg_info (seg)->hadone = 1; | |
262 | } | |
263 | ||
264 | stroff = get_stab_string_offset (string, stabstr_secname); | |
265 | ||
266 | /* At least for now, stabs in a special stab section are always | |
267 | output as 12 byte blocks of information. */ | |
268 | p = frag_more (8); | |
269 | md_number_to_chars (p, (valueT) stroff, 4); | |
270 | md_number_to_chars (p + 4, (valueT) type, 1); | |
271 | md_number_to_chars (p + 5, (valueT) other, 1); | |
272 | md_number_to_chars (p + 6, (valueT) desc, 2); | |
273 | ||
274 | if (what == 's' || what == 'n') | |
275 | { | |
276 | /* Pick up the value from the input line. */ | |
277 | cons (4); | |
278 | input_line_pointer--; | |
279 | } | |
280 | else | |
281 | { | |
282 | const char *fake; | |
283 | symbolS *symbol; | |
284 | expressionS exp; | |
285 | ||
286 | /* Arrange for a value representing the current location. */ | |
287 | fake = FAKE_LABEL_NAME; | |
288 | symbol = symbol_new (fake, saved_seg, dot, saved_frag); | |
289 | ||
290 | exp.X_op = O_symbol; | |
291 | exp.X_add_symbol = symbol; | |
292 | exp.X_add_number = 0; | |
293 | ||
294 | emit_expr (&exp, 4); | |
295 | } | |
296 | ||
297 | #ifdef OBJ_PROCESS_STAB | |
298 | OBJ_PROCESS_STAB (seg, what, string + stroff, type, other, desc); | |
299 | #endif | |
300 | ||
301 | subseg_set (saved_seg, saved_subseg); | |
302 | } | |
303 | else | |
304 | { | |
305 | #ifdef OBJ_PROCESS_STAB | |
306 | OBJ_PROCESS_STAB (0, what, string, type, other, desc); | |
307 | #else | |
308 | abort (); | |
309 | #endif | |
310 | } | |
311 | ||
312 | #ifndef NO_LISTING | |
313 | if (listing) | |
314 | { | |
315 | switch (type) | |
316 | { | |
317 | case N_SLINE: | |
318 | listing_source_line ((unsigned int) desc); | |
319 | break; | |
320 | case N_SO: | |
321 | case N_SOL: | |
322 | listing_source_file (string); | |
323 | break; | |
324 | } | |
325 | } | |
326 | #endif /* ! NO_LISTING */ | |
327 | ||
328 | demand_empty_rest_of_line (); | |
329 | } | |
330 | ||
331 | /* Regular stab directive. */ | |
332 | ||
333 | void | |
334 | s_stab (what) | |
335 | int what; | |
336 | { | |
337 | s_stab_generic (what, STAB_SECTION_NAME, STAB_STRING_SECTION_NAME); | |
338 | } | |
339 | ||
340 | /* "Extended stabs", used in Solaris only now. */ | |
341 | ||
342 | void | |
343 | s_xstab (what) | |
344 | int what; | |
345 | { | |
346 | int length; | |
347 | char *stab_secname, *stabstr_secname; | |
348 | ||
349 | stab_secname = demand_copy_C_string (&length); | |
350 | SKIP_WHITESPACE (); | |
351 | if (*input_line_pointer == ',') | |
352 | input_line_pointer++; | |
353 | else | |
354 | { | |
355 | as_bad ("comma missing in .xstabs"); | |
356 | ignore_rest_of_line (); | |
357 | return; | |
358 | } | |
359 | ||
360 | /* To get the name of the stab string section, simply add "str" to | |
361 | the stab section name. */ | |
362 | stabstr_secname = (char *) xmalloc (strlen (stab_secname) + 4); | |
363 | strcpy (stabstr_secname, stab_secname); | |
364 | strcat (stabstr_secname, "str"); | |
365 | s_stab_generic (what, stab_secname, stabstr_secname); | |
366 | free (stabstr_secname); | |
367 | } | |
368 | ||
369 | #ifdef S_SET_DESC | |
370 | ||
371 | /* Frob invented at RMS' request. Set the n_desc of a symbol. */ | |
372 | ||
373 | void | |
374 | s_desc (ignore) | |
375 | int ignore; | |
376 | { | |
377 | char *name; | |
378 | char c; | |
379 | char *p; | |
380 | symbolS *symbolP; | |
381 | int temp; | |
382 | ||
383 | name = input_line_pointer; | |
384 | c = get_symbol_end (); | |
385 | p = input_line_pointer; | |
386 | *p = c; | |
387 | SKIP_WHITESPACE (); | |
388 | if (*input_line_pointer != ',') | |
389 | { | |
390 | *p = 0; | |
391 | as_bad ("Expected comma after name \"%s\"", name); | |
392 | *p = c; | |
393 | ignore_rest_of_line (); | |
394 | } | |
395 | else | |
396 | { | |
397 | input_line_pointer++; | |
398 | temp = get_absolute_expression (); | |
399 | *p = 0; | |
400 | symbolP = symbol_find_or_make (name); | |
401 | *p = c; | |
402 | S_SET_DESC (symbolP, temp); | |
403 | } | |
404 | demand_empty_rest_of_line (); | |
405 | } /* s_desc() */ | |
406 | ||
407 | #endif /* defined (S_SET_DESC) */ |