Commit | Line | Data |
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bb2ec1b3 TT |
1 | /* Convert symbols from GDB to GCC |
2 | ||
32d0add0 | 3 | Copyright (C) 2014-2015 Free Software Foundation, Inc. |
bb2ec1b3 TT |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | ||
21 | #include "defs.h" | |
22 | #include "compile-internal.h" | |
bb2ec1b3 TT |
23 | #include "symtab.h" |
24 | #include "parser-defs.h" | |
25 | #include "block.h" | |
26 | #include "objfiles.h" | |
27 | #include "compile.h" | |
28 | #include "value.h" | |
29 | #include "exceptions.h" | |
30 | #include "gdbtypes.h" | |
31 | #include "dwarf2loc.h" | |
32 | ||
33 | \f | |
34 | ||
35 | /* Object of this type are stored in the compiler's symbol_err_map. */ | |
36 | ||
37 | struct symbol_error | |
38 | { | |
39 | /* The symbol. */ | |
40 | ||
41 | const struct symbol *sym; | |
42 | ||
43 | /* The error message to emit. This is malloc'd and owned by the | |
44 | hash table. */ | |
45 | ||
46 | char *message; | |
47 | }; | |
48 | ||
49 | /* Hash function for struct symbol_error. */ | |
50 | ||
51 | static hashval_t | |
52 | hash_symbol_error (const void *a) | |
53 | { | |
54 | const struct symbol_error *se = a; | |
55 | ||
56 | return htab_hash_pointer (se->sym); | |
57 | } | |
58 | ||
59 | /* Equality function for struct symbol_error. */ | |
60 | ||
61 | static int | |
62 | eq_symbol_error (const void *a, const void *b) | |
63 | { | |
64 | const struct symbol_error *sea = a; | |
65 | const struct symbol_error *seb = b; | |
66 | ||
67 | return sea->sym == seb->sym; | |
68 | } | |
69 | ||
70 | /* Deletion function for struct symbol_error. */ | |
71 | ||
72 | static void | |
73 | del_symbol_error (void *a) | |
74 | { | |
75 | struct symbol_error *se = a; | |
76 | ||
77 | xfree (se->message); | |
78 | xfree (se); | |
79 | } | |
80 | ||
81 | /* Associate SYMBOL with some error text. */ | |
82 | ||
83 | static void | |
84 | insert_symbol_error (htab_t hash, const struct symbol *sym, const char *text) | |
85 | { | |
86 | struct symbol_error e; | |
87 | void **slot; | |
88 | ||
89 | e.sym = sym; | |
90 | slot = htab_find_slot (hash, &e, INSERT); | |
91 | if (*slot == NULL) | |
92 | { | |
93 | struct symbol_error *e = XNEW (struct symbol_error); | |
94 | ||
95 | e->sym = sym; | |
96 | e->message = xstrdup (text); | |
97 | *slot = e; | |
98 | } | |
99 | } | |
100 | ||
101 | /* Emit the error message corresponding to SYM, if one exists, and | |
102 | arrange for it not to be emitted again. */ | |
103 | ||
104 | static void | |
105 | error_symbol_once (struct compile_c_instance *context, | |
106 | const struct symbol *sym) | |
107 | { | |
108 | struct symbol_error search; | |
109 | struct symbol_error *err; | |
110 | char *message; | |
111 | ||
112 | if (context->symbol_err_map == NULL) | |
113 | return; | |
114 | ||
115 | search.sym = sym; | |
116 | err = htab_find (context->symbol_err_map, &search); | |
117 | if (err == NULL || err->message == NULL) | |
118 | return; | |
119 | ||
120 | message = err->message; | |
121 | err->message = NULL; | |
122 | make_cleanup (xfree, message); | |
123 | error (_("%s"), message); | |
124 | } | |
125 | ||
126 | \f | |
127 | ||
128 | /* Compute the name of the pointer representing a local symbol's | |
129 | address. */ | |
130 | ||
131 | static char * | |
132 | symbol_substitution_name (struct symbol *sym) | |
133 | { | |
134 | return concat ("__", SYMBOL_NATURAL_NAME (sym), "_ptr", (char *) NULL); | |
135 | } | |
136 | ||
137 | /* Convert a given symbol, SYM, to the compiler's representation. | |
138 | CONTEXT is the compiler instance. IS_GLOBAL is true if the | |
139 | symbol came from the global scope. IS_LOCAL is true if the symbol | |
140 | came from a local scope. (Note that the two are not strictly | |
141 | inverses because the symbol might have come from the static | |
142 | scope.) */ | |
143 | ||
144 | static void | |
145 | convert_one_symbol (struct compile_c_instance *context, | |
63e43d3a | 146 | struct block_symbol sym, |
bb2ec1b3 TT |
147 | int is_global, |
148 | int is_local) | |
149 | { | |
150 | gcc_type sym_type; | |
63e43d3a PMR |
151 | const char *filename = symbol_symtab (sym.symbol)->filename; |
152 | unsigned short line = SYMBOL_LINE (sym.symbol); | |
bb2ec1b3 | 153 | |
63e43d3a | 154 | error_symbol_once (context, sym.symbol); |
bb2ec1b3 | 155 | |
63e43d3a | 156 | if (SYMBOL_CLASS (sym.symbol) == LOC_LABEL) |
bb2ec1b3 TT |
157 | sym_type = 0; |
158 | else | |
63e43d3a | 159 | sym_type = convert_type (context, SYMBOL_TYPE (sym.symbol)); |
bb2ec1b3 | 160 | |
63e43d3a | 161 | if (SYMBOL_DOMAIN (sym.symbol) == STRUCT_DOMAIN) |
bb2ec1b3 TT |
162 | { |
163 | /* Binding a tag, so we don't need to build a decl. */ | |
164 | C_CTX (context)->c_ops->tagbind (C_CTX (context), | |
63e43d3a | 165 | SYMBOL_NATURAL_NAME (sym.symbol), |
bb2ec1b3 TT |
166 | sym_type, filename, line); |
167 | } | |
168 | else | |
169 | { | |
170 | gcc_decl decl; | |
171 | enum gcc_c_symbol_kind kind; | |
172 | CORE_ADDR addr = 0; | |
173 | char *symbol_name = NULL; | |
174 | ||
63e43d3a | 175 | switch (SYMBOL_CLASS (sym.symbol)) |
bb2ec1b3 TT |
176 | { |
177 | case LOC_TYPEDEF: | |
178 | kind = GCC_C_SYMBOL_TYPEDEF; | |
179 | break; | |
180 | ||
181 | case LOC_LABEL: | |
182 | kind = GCC_C_SYMBOL_LABEL; | |
63e43d3a | 183 | addr = SYMBOL_VALUE_ADDRESS (sym.symbol); |
bb2ec1b3 TT |
184 | break; |
185 | ||
186 | case LOC_BLOCK: | |
187 | kind = GCC_C_SYMBOL_FUNCTION; | |
63e43d3a PMR |
188 | addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym.symbol)); |
189 | if (is_global && TYPE_GNU_IFUNC (SYMBOL_TYPE (sym.symbol))) | |
081a1c2c | 190 | addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr); |
bb2ec1b3 TT |
191 | break; |
192 | ||
193 | case LOC_CONST: | |
63e43d3a | 194 | if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_ENUM) |
bb2ec1b3 TT |
195 | { |
196 | /* Already handled by convert_enum. */ | |
197 | return; | |
198 | } | |
63e43d3a PMR |
199 | C_CTX (context)->c_ops->build_constant |
200 | (C_CTX (context), | |
201 | sym_type, SYMBOL_NATURAL_NAME (sym.symbol), | |
202 | SYMBOL_VALUE (sym.symbol), | |
203 | filename, line); | |
bb2ec1b3 TT |
204 | return; |
205 | ||
206 | case LOC_CONST_BYTES: | |
207 | error (_("Unsupported LOC_CONST_BYTES for symbol \"%s\"."), | |
63e43d3a | 208 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
209 | |
210 | case LOC_UNDEF: | |
211 | internal_error (__FILE__, __LINE__, _("LOC_UNDEF found for \"%s\"."), | |
63e43d3a | 212 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
213 | |
214 | case LOC_COMMON_BLOCK: | |
215 | error (_("Fortran common block is unsupported for compilation " | |
216 | "evaluaton of symbol \"%s\"."), | |
63e43d3a | 217 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
218 | |
219 | case LOC_OPTIMIZED_OUT: | |
220 | error (_("Symbol \"%s\" cannot be used for compilation evaluation " | |
221 | "as it is optimized out."), | |
63e43d3a | 222 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
223 | |
224 | case LOC_COMPUTED: | |
225 | if (is_local) | |
226 | goto substitution; | |
227 | /* Probably TLS here. */ | |
228 | warning (_("Symbol \"%s\" is thread-local and currently can only " | |
229 | "be referenced from the current thread in " | |
230 | "compiled code."), | |
63e43d3a | 231 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
232 | /* FALLTHROUGH */ |
233 | case LOC_UNRESOLVED: | |
234 | /* 'symbol_name' cannot be used here as that one is used only for | |
235 | local variables from compile_dwarf_expr_to_c. | |
236 | Global variables can be accessed by GCC only by their address, not | |
237 | by their name. */ | |
238 | { | |
239 | struct value *val; | |
240 | struct frame_info *frame = NULL; | |
241 | ||
63e43d3a | 242 | if (symbol_read_needs_frame (sym.symbol)) |
bb2ec1b3 TT |
243 | { |
244 | frame = get_selected_frame (NULL); | |
245 | if (frame == NULL) | |
246 | error (_("Symbol \"%s\" cannot be used because " | |
247 | "there is no selected frame"), | |
63e43d3a | 248 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
249 | } |
250 | ||
63e43d3a | 251 | val = read_var_value (sym.symbol, sym.block, frame); |
bb2ec1b3 TT |
252 | if (VALUE_LVAL (val) != lval_memory) |
253 | error (_("Symbol \"%s\" cannot be used for compilation " | |
254 | "evaluation as its address has not been found."), | |
63e43d3a | 255 | SYMBOL_PRINT_NAME (sym.symbol)); |
bb2ec1b3 TT |
256 | |
257 | kind = GCC_C_SYMBOL_VARIABLE; | |
258 | addr = value_address (val); | |
259 | } | |
260 | break; | |
261 | ||
262 | ||
263 | case LOC_REGISTER: | |
264 | case LOC_ARG: | |
265 | case LOC_REF_ARG: | |
266 | case LOC_REGPARM_ADDR: | |
267 | case LOC_LOCAL: | |
268 | substitution: | |
269 | kind = GCC_C_SYMBOL_VARIABLE; | |
63e43d3a | 270 | symbol_name = symbol_substitution_name (sym.symbol); |
bb2ec1b3 TT |
271 | break; |
272 | ||
273 | case LOC_STATIC: | |
274 | kind = GCC_C_SYMBOL_VARIABLE; | |
63e43d3a | 275 | addr = SYMBOL_VALUE_ADDRESS (sym.symbol); |
bb2ec1b3 TT |
276 | break; |
277 | ||
278 | case LOC_FINAL_VALUE: | |
279 | default: | |
280 | gdb_assert_not_reached ("Unreachable case in convert_one_symbol."); | |
281 | ||
282 | } | |
283 | ||
284 | /* Don't emit local variable decls for a raw expression. */ | |
285 | if (context->base.scope != COMPILE_I_RAW_SCOPE | |
286 | || symbol_name == NULL) | |
287 | { | |
63e43d3a PMR |
288 | decl = C_CTX (context)->c_ops->build_decl |
289 | (C_CTX (context), | |
290 | SYMBOL_NATURAL_NAME (sym.symbol), | |
291 | kind, | |
292 | sym_type, | |
293 | symbol_name, addr, | |
294 | filename, line); | |
bb2ec1b3 TT |
295 | |
296 | C_CTX (context)->c_ops->bind (C_CTX (context), decl, is_global); | |
297 | } | |
298 | ||
299 | xfree (symbol_name); | |
300 | } | |
301 | } | |
302 | ||
303 | /* Convert a full symbol to its gcc form. CONTEXT is the compiler to | |
304 | use, IDENTIFIER is the name of the symbol, SYM is the symbol | |
305 | itself, and DOMAIN is the domain which was searched. */ | |
306 | ||
307 | static void | |
308 | convert_symbol_sym (struct compile_c_instance *context, const char *identifier, | |
d12307c1 | 309 | struct block_symbol sym, domain_enum domain) |
bb2ec1b3 | 310 | { |
d12307c1 | 311 | const struct block *static_block; |
bb2ec1b3 TT |
312 | int is_local_symbol; |
313 | ||
bb2ec1b3 TT |
314 | /* If we found a symbol and it is not in the static or global |
315 | scope, then we should first convert any static or global scope | |
316 | symbol of the same name. This lets this unusual case work: | |
317 | ||
318 | int x; // Global. | |
319 | int func(void) | |
320 | { | |
321 | int x; | |
322 | // At this spot, evaluate "extern int x; x" | |
323 | } | |
324 | */ | |
325 | ||
d12307c1 | 326 | static_block = block_static_block (sym.block); |
bb2ec1b3 | 327 | /* STATIC_BLOCK is NULL if FOUND_BLOCK is the global block. */ |
d12307c1 | 328 | is_local_symbol = (sym.block != static_block && static_block != NULL); |
bb2ec1b3 TT |
329 | if (is_local_symbol) |
330 | { | |
d12307c1 | 331 | struct block_symbol global_sym; |
bb2ec1b3 TT |
332 | |
333 | global_sym = lookup_symbol (identifier, NULL, domain, NULL); | |
334 | /* If the outer symbol is in the static block, we ignore it, as | |
335 | it cannot be referenced. */ | |
d12307c1 PMR |
336 | if (global_sym.symbol != NULL |
337 | && global_sym.block != block_static_block (global_sym.block)) | |
bb2ec1b3 TT |
338 | { |
339 | if (compile_debug) | |
a4063588 | 340 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
341 | "gcc_convert_symbol \"%s\": global symbol\n", |
342 | identifier); | |
63e43d3a | 343 | convert_one_symbol (context, global_sym, 1, 0); |
bb2ec1b3 TT |
344 | } |
345 | } | |
346 | ||
347 | if (compile_debug) | |
a4063588 | 348 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
349 | "gcc_convert_symbol \"%s\": local symbol\n", |
350 | identifier); | |
63e43d3a | 351 | convert_one_symbol (context, sym, 0, is_local_symbol); |
bb2ec1b3 TT |
352 | } |
353 | ||
354 | /* Convert a minimal symbol to its gcc form. CONTEXT is the compiler | |
355 | to use and BMSYM is the minimal symbol to convert. */ | |
356 | ||
357 | static void | |
358 | convert_symbol_bmsym (struct compile_c_instance *context, | |
359 | struct bound_minimal_symbol bmsym) | |
360 | { | |
361 | struct minimal_symbol *msym = bmsym.minsym; | |
362 | struct objfile *objfile = bmsym.objfile; | |
363 | struct type *type; | |
364 | enum gcc_c_symbol_kind kind; | |
365 | gcc_type sym_type; | |
366 | gcc_decl decl; | |
367 | CORE_ADDR addr; | |
368 | ||
081a1c2c JK |
369 | addr = MSYMBOL_VALUE_ADDRESS (objfile, msym); |
370 | ||
bb2ec1b3 TT |
371 | /* Conversion copied from write_exp_msymbol. */ |
372 | switch (MSYMBOL_TYPE (msym)) | |
373 | { | |
374 | case mst_text: | |
375 | case mst_file_text: | |
376 | case mst_solib_trampoline: | |
377 | type = objfile_type (objfile)->nodebug_text_symbol; | |
378 | kind = GCC_C_SYMBOL_FUNCTION; | |
379 | break; | |
380 | ||
381 | case mst_text_gnu_ifunc: | |
081a1c2c JK |
382 | /* nodebug_text_gnu_ifunc_symbol would cause: |
383 | function return type cannot be function */ | |
384 | type = objfile_type (objfile)->nodebug_text_symbol; | |
bb2ec1b3 | 385 | kind = GCC_C_SYMBOL_FUNCTION; |
081a1c2c | 386 | addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr); |
bb2ec1b3 TT |
387 | break; |
388 | ||
389 | case mst_data: | |
390 | case mst_file_data: | |
391 | case mst_bss: | |
392 | case mst_file_bss: | |
393 | type = objfile_type (objfile)->nodebug_data_symbol; | |
394 | kind = GCC_C_SYMBOL_VARIABLE; | |
395 | break; | |
396 | ||
397 | case mst_slot_got_plt: | |
398 | type = objfile_type (objfile)->nodebug_got_plt_symbol; | |
399 | kind = GCC_C_SYMBOL_FUNCTION; | |
400 | break; | |
401 | ||
402 | default: | |
403 | type = objfile_type (objfile)->nodebug_unknown_symbol; | |
404 | kind = GCC_C_SYMBOL_VARIABLE; | |
405 | break; | |
406 | } | |
407 | ||
408 | sym_type = convert_type (context, type); | |
bb2ec1b3 TT |
409 | decl = C_CTX (context)->c_ops->build_decl (C_CTX (context), |
410 | MSYMBOL_NATURAL_NAME (msym), | |
411 | kind, sym_type, NULL, addr, | |
412 | NULL, 0); | |
413 | C_CTX (context)->c_ops->bind (C_CTX (context), decl, 1 /* is_global */); | |
414 | } | |
415 | ||
416 | /* See compile-internal.h. */ | |
417 | ||
418 | void | |
419 | gcc_convert_symbol (void *datum, | |
420 | struct gcc_c_context *gcc_context, | |
421 | enum gcc_c_oracle_request request, | |
422 | const char *identifier) | |
423 | { | |
424 | struct compile_c_instance *context = datum; | |
425 | domain_enum domain; | |
bb2ec1b3 TT |
426 | int found = 0; |
427 | ||
428 | switch (request) | |
429 | { | |
430 | case GCC_C_ORACLE_SYMBOL: | |
431 | domain = VAR_DOMAIN; | |
432 | break; | |
433 | case GCC_C_ORACLE_TAG: | |
434 | domain = STRUCT_DOMAIN; | |
435 | break; | |
436 | case GCC_C_ORACLE_LABEL: | |
437 | domain = LABEL_DOMAIN; | |
438 | break; | |
439 | default: | |
440 | gdb_assert_not_reached ("Unrecognized oracle request."); | |
441 | } | |
442 | ||
443 | /* We can't allow exceptions to escape out of this callback. Safest | |
444 | is to simply emit a gcc error. */ | |
492d29ea | 445 | TRY |
bb2ec1b3 | 446 | { |
d12307c1 | 447 | struct block_symbol sym; |
bb2ec1b3 TT |
448 | |
449 | sym = lookup_symbol (identifier, context->base.block, domain, NULL); | |
d12307c1 | 450 | if (sym.symbol != NULL) |
bb2ec1b3 TT |
451 | { |
452 | convert_symbol_sym (context, identifier, sym, domain); | |
453 | found = 1; | |
454 | } | |
455 | else if (domain == VAR_DOMAIN) | |
456 | { | |
457 | struct bound_minimal_symbol bmsym; | |
458 | ||
459 | bmsym = lookup_minimal_symbol (identifier, NULL, NULL); | |
460 | if (bmsym.minsym != NULL) | |
461 | { | |
462 | convert_symbol_bmsym (context, bmsym); | |
463 | found = 1; | |
464 | } | |
465 | } | |
466 | } | |
467 | ||
492d29ea PA |
468 | CATCH (e, RETURN_MASK_ALL) |
469 | { | |
470 | C_CTX (context)->c_ops->error (C_CTX (context), e.message); | |
471 | } | |
472 | END_CATCH | |
bb2ec1b3 TT |
473 | |
474 | if (compile_debug && !found) | |
a4063588 | 475 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
476 | "gcc_convert_symbol \"%s\": lookup_symbol failed\n", |
477 | identifier); | |
478 | return; | |
479 | } | |
480 | ||
481 | /* See compile-internal.h. */ | |
482 | ||
483 | gcc_address | |
484 | gcc_symbol_address (void *datum, struct gcc_c_context *gcc_context, | |
485 | const char *identifier) | |
486 | { | |
487 | struct compile_c_instance *context = datum; | |
bb2ec1b3 TT |
488 | gcc_address result = 0; |
489 | int found = 0; | |
490 | ||
491 | /* We can't allow exceptions to escape out of this callback. Safest | |
492 | is to simply emit a gcc error. */ | |
492d29ea | 493 | TRY |
bb2ec1b3 TT |
494 | { |
495 | struct symbol *sym; | |
496 | ||
497 | /* We only need global functions here. */ | |
d12307c1 | 498 | sym = lookup_symbol (identifier, NULL, VAR_DOMAIN, NULL).symbol; |
bb2ec1b3 TT |
499 | if (sym != NULL && SYMBOL_CLASS (sym) == LOC_BLOCK) |
500 | { | |
501 | if (compile_debug) | |
a4063588 | 502 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
503 | "gcc_symbol_address \"%s\": full symbol\n", |
504 | identifier); | |
505 | result = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); | |
081a1c2c JK |
506 | if (TYPE_GNU_IFUNC (SYMBOL_TYPE (sym))) |
507 | result = gnu_ifunc_resolve_addr (target_gdbarch (), result); | |
bb2ec1b3 TT |
508 | found = 1; |
509 | } | |
510 | else | |
511 | { | |
512 | struct bound_minimal_symbol msym; | |
513 | ||
514 | msym = lookup_bound_minimal_symbol (identifier); | |
515 | if (msym.minsym != NULL) | |
516 | { | |
517 | if (compile_debug) | |
a4063588 | 518 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
519 | "gcc_symbol_address \"%s\": minimal " |
520 | "symbol\n", | |
521 | identifier); | |
522 | result = BMSYMBOL_VALUE_ADDRESS (msym); | |
081a1c2c JK |
523 | if (MSYMBOL_TYPE (msym.minsym) == mst_text_gnu_ifunc) |
524 | result = gnu_ifunc_resolve_addr (target_gdbarch (), result); | |
bb2ec1b3 TT |
525 | found = 1; |
526 | } | |
527 | } | |
528 | } | |
529 | ||
492d29ea PA |
530 | CATCH (e, RETURN_MASK_ERROR) |
531 | { | |
532 | C_CTX (context)->c_ops->error (C_CTX (context), e.message); | |
533 | } | |
534 | END_CATCH | |
bb2ec1b3 TT |
535 | |
536 | if (compile_debug && !found) | |
a4063588 | 537 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
538 | "gcc_symbol_address \"%s\": failed\n", |
539 | identifier); | |
540 | return result; | |
541 | } | |
542 | ||
543 | \f | |
544 | ||
545 | /* A hash function for symbol names. */ | |
546 | ||
547 | static hashval_t | |
548 | hash_symname (const void *a) | |
549 | { | |
550 | const struct symbol *sym = a; | |
551 | ||
552 | return htab_hash_string (SYMBOL_NATURAL_NAME (sym)); | |
553 | } | |
554 | ||
555 | /* A comparison function for hash tables that just looks at symbol | |
556 | names. */ | |
557 | ||
558 | static int | |
559 | eq_symname (const void *a, const void *b) | |
560 | { | |
561 | const struct symbol *syma = a; | |
562 | const struct symbol *symb = b; | |
563 | ||
564 | return strcmp (SYMBOL_NATURAL_NAME (syma), SYMBOL_NATURAL_NAME (symb)) == 0; | |
565 | } | |
566 | ||
567 | /* If a symbol with the same name as SYM is already in HASHTAB, return | |
568 | 1. Otherwise, add SYM to HASHTAB and return 0. */ | |
569 | ||
570 | static int | |
571 | symbol_seen (htab_t hashtab, struct symbol *sym) | |
572 | { | |
573 | void **slot; | |
574 | ||
575 | slot = htab_find_slot (hashtab, sym, INSERT); | |
576 | if (*slot != NULL) | |
577 | return 1; | |
578 | ||
579 | *slot = sym; | |
580 | return 0; | |
581 | } | |
582 | ||
583 | /* Generate C code to compute the length of a VLA. */ | |
584 | ||
585 | static void | |
586 | generate_vla_size (struct compile_c_instance *compiler, | |
587 | struct ui_file *stream, | |
588 | struct gdbarch *gdbarch, | |
589 | unsigned char *registers_used, | |
590 | CORE_ADDR pc, | |
591 | struct type *type, | |
592 | struct symbol *sym) | |
593 | { | |
594 | type = check_typedef (type); | |
595 | ||
596 | if (TYPE_CODE (type) == TYPE_CODE_REF) | |
597 | type = check_typedef (TYPE_TARGET_TYPE (type)); | |
598 | ||
599 | switch (TYPE_CODE (type)) | |
600 | { | |
601 | case TYPE_CODE_RANGE: | |
602 | { | |
603 | if (TYPE_HIGH_BOUND_KIND (type) == PROP_LOCEXPR | |
604 | || TYPE_HIGH_BOUND_KIND (type) == PROP_LOCLIST) | |
605 | { | |
606 | const struct dynamic_prop *prop = &TYPE_RANGE_DATA (type)->high; | |
607 | char *name = c_get_range_decl_name (prop); | |
608 | struct cleanup *cleanup = make_cleanup (xfree, name); | |
609 | ||
610 | dwarf2_compile_property_to_c (stream, name, | |
611 | gdbarch, registers_used, | |
612 | prop, pc, sym); | |
613 | do_cleanups (cleanup); | |
614 | } | |
615 | } | |
616 | break; | |
617 | ||
618 | case TYPE_CODE_ARRAY: | |
619 | generate_vla_size (compiler, stream, gdbarch, registers_used, pc, | |
620 | TYPE_INDEX_TYPE (type), sym); | |
621 | generate_vla_size (compiler, stream, gdbarch, registers_used, pc, | |
622 | TYPE_TARGET_TYPE (type), sym); | |
623 | break; | |
624 | ||
625 | case TYPE_CODE_UNION: | |
626 | case TYPE_CODE_STRUCT: | |
627 | { | |
628 | int i; | |
629 | ||
630 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
631 | if (!field_is_static (&TYPE_FIELD (type, i))) | |
632 | generate_vla_size (compiler, stream, gdbarch, registers_used, pc, | |
633 | TYPE_FIELD_TYPE (type, i), sym); | |
634 | } | |
635 | break; | |
636 | } | |
637 | } | |
638 | ||
639 | /* Generate C code to compute the address of SYM. */ | |
640 | ||
641 | static void | |
642 | generate_c_for_for_one_variable (struct compile_c_instance *compiler, | |
643 | struct ui_file *stream, | |
644 | struct gdbarch *gdbarch, | |
645 | unsigned char *registers_used, | |
646 | CORE_ADDR pc, | |
647 | struct symbol *sym) | |
648 | { | |
bb2ec1b3 | 649 | |
492d29ea | 650 | TRY |
bb2ec1b3 TT |
651 | { |
652 | if (is_dynamic_type (SYMBOL_TYPE (sym))) | |
653 | { | |
654 | struct ui_file *size_file = mem_fileopen (); | |
655 | struct cleanup *cleanup = make_cleanup_ui_file_delete (size_file); | |
656 | ||
657 | generate_vla_size (compiler, size_file, gdbarch, registers_used, pc, | |
658 | SYMBOL_TYPE (sym), sym); | |
659 | ui_file_put (size_file, ui_file_write_for_put, stream); | |
660 | ||
661 | do_cleanups (cleanup); | |
662 | } | |
663 | ||
664 | if (SYMBOL_COMPUTED_OPS (sym) != NULL) | |
665 | { | |
666 | char *generated_name = symbol_substitution_name (sym); | |
667 | struct cleanup *cleanup = make_cleanup (xfree, generated_name); | |
668 | /* We need to emit to a temporary buffer in case an error | |
669 | occurs in the middle. */ | |
670 | struct ui_file *local_file = mem_fileopen (); | |
671 | ||
672 | make_cleanup_ui_file_delete (local_file); | |
673 | SYMBOL_COMPUTED_OPS (sym)->generate_c_location (sym, local_file, | |
674 | gdbarch, | |
675 | registers_used, | |
676 | pc, generated_name); | |
677 | ui_file_put (local_file, ui_file_write_for_put, stream); | |
678 | ||
679 | do_cleanups (cleanup); | |
680 | } | |
681 | else | |
682 | { | |
683 | switch (SYMBOL_CLASS (sym)) | |
684 | { | |
685 | case LOC_REGISTER: | |
686 | case LOC_ARG: | |
687 | case LOC_REF_ARG: | |
688 | case LOC_REGPARM_ADDR: | |
689 | case LOC_LOCAL: | |
690 | error (_("Local symbol unhandled when generating C code.")); | |
691 | ||
692 | case LOC_COMPUTED: | |
693 | gdb_assert_not_reached (_("LOC_COMPUTED variable " | |
694 | "missing a method.")); | |
695 | ||
696 | default: | |
697 | /* Nothing to do for all other cases, as they don't represent | |
698 | local variables. */ | |
699 | break; | |
700 | } | |
701 | } | |
702 | } | |
703 | ||
492d29ea | 704 | CATCH (e, RETURN_MASK_ERROR) |
7556d4a4 PA |
705 | { |
706 | if (compiler->symbol_err_map == NULL) | |
707 | compiler->symbol_err_map = htab_create_alloc (10, | |
708 | hash_symbol_error, | |
709 | eq_symbol_error, | |
710 | del_symbol_error, | |
711 | xcalloc, | |
712 | xfree); | |
713 | insert_symbol_error (compiler->symbol_err_map, sym, e.message); | |
714 | } | |
492d29ea | 715 | END_CATCH |
bb2ec1b3 TT |
716 | } |
717 | ||
718 | /* See compile-internal.h. */ | |
719 | ||
720 | unsigned char * | |
721 | generate_c_for_variable_locations (struct compile_c_instance *compiler, | |
722 | struct ui_file *stream, | |
723 | struct gdbarch *gdbarch, | |
724 | const struct block *block, | |
725 | CORE_ADDR pc) | |
726 | { | |
727 | struct cleanup *cleanup, *outer; | |
728 | htab_t symhash; | |
729 | const struct block *static_block = block_static_block (block); | |
730 | unsigned char *registers_used; | |
731 | ||
732 | /* If we're already in the static or global block, there is nothing | |
733 | to write. */ | |
734 | if (static_block == NULL || block == static_block) | |
735 | return NULL; | |
736 | ||
737 | registers_used = XCNEWVEC (unsigned char, gdbarch_num_regs (gdbarch)); | |
738 | outer = make_cleanup (xfree, registers_used); | |
739 | ||
740 | /* Ensure that a given name is only entered once. This reflects the | |
741 | reality of shadowing. */ | |
742 | symhash = htab_create_alloc (1, hash_symname, eq_symname, NULL, | |
743 | xcalloc, xfree); | |
744 | cleanup = make_cleanup_htab_delete (symhash); | |
745 | ||
746 | while (1) | |
747 | { | |
748 | struct symbol *sym; | |
749 | struct block_iterator iter; | |
750 | ||
751 | /* Iterate over symbols in this block, generating code to | |
752 | compute the location of each local variable. */ | |
753 | for (sym = block_iterator_first (block, &iter); | |
754 | sym != NULL; | |
755 | sym = block_iterator_next (&iter)) | |
756 | { | |
757 | if (!symbol_seen (symhash, sym)) | |
758 | generate_c_for_for_one_variable (compiler, stream, gdbarch, | |
759 | registers_used, pc, sym); | |
760 | } | |
761 | ||
762 | /* If we just finished the outermost block of a function, we're | |
763 | done. */ | |
764 | if (BLOCK_FUNCTION (block) != NULL) | |
765 | break; | |
766 | block = BLOCK_SUPERBLOCK (block); | |
767 | } | |
768 | ||
769 | do_cleanups (cleanup); | |
770 | discard_cleanups (outer); | |
771 | return registers_used; | |
772 | } |