Commit | Line | Data |
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bb2ec1b3 TT |
1 | /* Convert symbols from GDB to GCC |
2 | ||
e2882c85 | 3 | Copyright (C) 2014-2018 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" | |
b7dc48b4 | 23 | #include "compile-c.h" |
bb2ec1b3 TT |
24 | #include "symtab.h" |
25 | #include "parser-defs.h" | |
26 | #include "block.h" | |
27 | #include "objfiles.h" | |
28 | #include "compile.h" | |
29 | #include "value.h" | |
30 | #include "exceptions.h" | |
31 | #include "gdbtypes.h" | |
32 | #include "dwarf2loc.h" | |
33 | ||
34 | \f | |
35 | ||
36 | /* Object of this type are stored in the compiler's symbol_err_map. */ | |
37 | ||
38 | struct symbol_error | |
39 | { | |
40 | /* The symbol. */ | |
41 | ||
42 | const struct symbol *sym; | |
43 | ||
44 | /* The error message to emit. This is malloc'd and owned by the | |
45 | hash table. */ | |
46 | ||
47 | char *message; | |
48 | }; | |
49 | ||
50 | /* Hash function for struct symbol_error. */ | |
51 | ||
52 | static hashval_t | |
53 | hash_symbol_error (const void *a) | |
54 | { | |
9a3c8263 | 55 | const struct symbol_error *se = (const struct symbol_error *) a; |
bb2ec1b3 TT |
56 | |
57 | return htab_hash_pointer (se->sym); | |
58 | } | |
59 | ||
60 | /* Equality function for struct symbol_error. */ | |
61 | ||
62 | static int | |
63 | eq_symbol_error (const void *a, const void *b) | |
64 | { | |
9a3c8263 SM |
65 | const struct symbol_error *sea = (const struct symbol_error *) a; |
66 | const struct symbol_error *seb = (const struct symbol_error *) b; | |
bb2ec1b3 TT |
67 | |
68 | return sea->sym == seb->sym; | |
69 | } | |
70 | ||
71 | /* Deletion function for struct symbol_error. */ | |
72 | ||
73 | static void | |
74 | del_symbol_error (void *a) | |
75 | { | |
9a3c8263 | 76 | struct symbol_error *se = (struct symbol_error *) a; |
bb2ec1b3 TT |
77 | |
78 | xfree (se->message); | |
79 | xfree (se); | |
80 | } | |
81 | ||
82 | /* Associate SYMBOL with some error text. */ | |
83 | ||
84 | static void | |
85 | insert_symbol_error (htab_t hash, const struct symbol *sym, const char *text) | |
86 | { | |
87 | struct symbol_error e; | |
88 | void **slot; | |
89 | ||
90 | e.sym = sym; | |
91 | slot = htab_find_slot (hash, &e, INSERT); | |
92 | if (*slot == NULL) | |
93 | { | |
94 | struct symbol_error *e = XNEW (struct symbol_error); | |
95 | ||
96 | e->sym = sym; | |
97 | e->message = xstrdup (text); | |
98 | *slot = e; | |
99 | } | |
100 | } | |
101 | ||
102 | /* Emit the error message corresponding to SYM, if one exists, and | |
103 | arrange for it not to be emitted again. */ | |
104 | ||
105 | static void | |
106 | error_symbol_once (struct compile_c_instance *context, | |
107 | const struct symbol *sym) | |
108 | { | |
109 | struct symbol_error search; | |
110 | struct symbol_error *err; | |
bb2ec1b3 TT |
111 | |
112 | if (context->symbol_err_map == NULL) | |
113 | return; | |
114 | ||
115 | search.sym = sym; | |
9a3c8263 | 116 | err = (struct symbol_error *) htab_find (context->symbol_err_map, &search); |
bb2ec1b3 TT |
117 | if (err == NULL || err->message == NULL) |
118 | return; | |
119 | ||
8f84fb0e | 120 | gdb::unique_xmalloc_ptr<char> message (err->message); |
bb2ec1b3 | 121 | err->message = NULL; |
8f84fb0e | 122 | error (_("%s"), message.get ()); |
bb2ec1b3 TT |
123 | } |
124 | ||
125 | \f | |
126 | ||
127 | /* Compute the name of the pointer representing a local symbol's | |
128 | address. */ | |
129 | ||
8f84fb0e | 130 | static gdb::unique_xmalloc_ptr<char> |
6f36b6d2 | 131 | c_symbol_substitution_name (struct symbol *sym) |
bb2ec1b3 | 132 | { |
8f84fb0e TT |
133 | return gdb::unique_xmalloc_ptr<char> |
134 | (concat ("__", SYMBOL_NATURAL_NAME (sym), "_ptr", (char *) NULL)); | |
bb2ec1b3 TT |
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; | |
8f84fb0e | 173 | gdb::unique_xmalloc_ptr<char> symbol_name; |
bb2ec1b3 | 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; | |
6f36b6d2 | 270 | symbol_name = c_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, | |
8f84fb0e | 293 | symbol_name.get (), addr, |
63e43d3a | 294 | filename, line); |
bb2ec1b3 TT |
295 | |
296 | C_CTX (context)->c_ops->bind (C_CTX (context), decl, is_global); | |
297 | } | |
bb2ec1b3 TT |
298 | } |
299 | } | |
300 | ||
301 | /* Convert a full symbol to its gcc form. CONTEXT is the compiler to | |
302 | use, IDENTIFIER is the name of the symbol, SYM is the symbol | |
303 | itself, and DOMAIN is the domain which was searched. */ | |
304 | ||
305 | static void | |
306 | convert_symbol_sym (struct compile_c_instance *context, const char *identifier, | |
d12307c1 | 307 | struct block_symbol sym, domain_enum domain) |
bb2ec1b3 | 308 | { |
d12307c1 | 309 | const struct block *static_block; |
bb2ec1b3 TT |
310 | int is_local_symbol; |
311 | ||
bb2ec1b3 TT |
312 | /* If we found a symbol and it is not in the static or global |
313 | scope, then we should first convert any static or global scope | |
314 | symbol of the same name. This lets this unusual case work: | |
315 | ||
316 | int x; // Global. | |
317 | int func(void) | |
318 | { | |
319 | int x; | |
320 | // At this spot, evaluate "extern int x; x" | |
321 | } | |
322 | */ | |
323 | ||
d12307c1 | 324 | static_block = block_static_block (sym.block); |
bb2ec1b3 | 325 | /* STATIC_BLOCK is NULL if FOUND_BLOCK is the global block. */ |
d12307c1 | 326 | is_local_symbol = (sym.block != static_block && static_block != NULL); |
bb2ec1b3 TT |
327 | if (is_local_symbol) |
328 | { | |
d12307c1 | 329 | struct block_symbol global_sym; |
bb2ec1b3 TT |
330 | |
331 | global_sym = lookup_symbol (identifier, NULL, domain, NULL); | |
332 | /* If the outer symbol is in the static block, we ignore it, as | |
333 | it cannot be referenced. */ | |
d12307c1 PMR |
334 | if (global_sym.symbol != NULL |
335 | && global_sym.block != block_static_block (global_sym.block)) | |
bb2ec1b3 TT |
336 | { |
337 | if (compile_debug) | |
a4063588 | 338 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
339 | "gcc_convert_symbol \"%s\": global symbol\n", |
340 | identifier); | |
63e43d3a | 341 | convert_one_symbol (context, global_sym, 1, 0); |
bb2ec1b3 TT |
342 | } |
343 | } | |
344 | ||
345 | if (compile_debug) | |
a4063588 | 346 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
347 | "gcc_convert_symbol \"%s\": local symbol\n", |
348 | identifier); | |
63e43d3a | 349 | convert_one_symbol (context, sym, 0, is_local_symbol); |
bb2ec1b3 TT |
350 | } |
351 | ||
352 | /* Convert a minimal symbol to its gcc form. CONTEXT is the compiler | |
353 | to use and BMSYM is the minimal symbol to convert. */ | |
354 | ||
355 | static void | |
356 | convert_symbol_bmsym (struct compile_c_instance *context, | |
357 | struct bound_minimal_symbol bmsym) | |
358 | { | |
359 | struct minimal_symbol *msym = bmsym.minsym; | |
360 | struct objfile *objfile = bmsym.objfile; | |
361 | struct type *type; | |
362 | enum gcc_c_symbol_kind kind; | |
363 | gcc_type sym_type; | |
364 | gcc_decl decl; | |
365 | CORE_ADDR addr; | |
366 | ||
081a1c2c JK |
367 | addr = MSYMBOL_VALUE_ADDRESS (objfile, msym); |
368 | ||
bb2ec1b3 TT |
369 | /* Conversion copied from write_exp_msymbol. */ |
370 | switch (MSYMBOL_TYPE (msym)) | |
371 | { | |
372 | case mst_text: | |
373 | case mst_file_text: | |
374 | case mst_solib_trampoline: | |
375 | type = objfile_type (objfile)->nodebug_text_symbol; | |
376 | kind = GCC_C_SYMBOL_FUNCTION; | |
377 | break; | |
378 | ||
379 | case mst_text_gnu_ifunc: | |
7022349d | 380 | type = objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol; |
bb2ec1b3 | 381 | kind = GCC_C_SYMBOL_FUNCTION; |
081a1c2c | 382 | addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr); |
bb2ec1b3 TT |
383 | break; |
384 | ||
385 | case mst_data: | |
386 | case mst_file_data: | |
387 | case mst_bss: | |
388 | case mst_file_bss: | |
389 | type = objfile_type (objfile)->nodebug_data_symbol; | |
390 | kind = GCC_C_SYMBOL_VARIABLE; | |
391 | break; | |
392 | ||
393 | case mst_slot_got_plt: | |
394 | type = objfile_type (objfile)->nodebug_got_plt_symbol; | |
395 | kind = GCC_C_SYMBOL_FUNCTION; | |
396 | break; | |
397 | ||
398 | default: | |
399 | type = objfile_type (objfile)->nodebug_unknown_symbol; | |
400 | kind = GCC_C_SYMBOL_VARIABLE; | |
401 | break; | |
402 | } | |
403 | ||
404 | sym_type = convert_type (context, type); | |
bb2ec1b3 TT |
405 | decl = C_CTX (context)->c_ops->build_decl (C_CTX (context), |
406 | MSYMBOL_NATURAL_NAME (msym), | |
407 | kind, sym_type, NULL, addr, | |
408 | NULL, 0); | |
409 | C_CTX (context)->c_ops->bind (C_CTX (context), decl, 1 /* is_global */); | |
410 | } | |
411 | ||
412 | /* See compile-internal.h. */ | |
413 | ||
414 | void | |
415 | gcc_convert_symbol (void *datum, | |
416 | struct gcc_c_context *gcc_context, | |
417 | enum gcc_c_oracle_request request, | |
418 | const char *identifier) | |
419 | { | |
9a3c8263 | 420 | struct compile_c_instance *context = (struct compile_c_instance *) datum; |
bb2ec1b3 | 421 | domain_enum domain; |
bb2ec1b3 TT |
422 | int found = 0; |
423 | ||
424 | switch (request) | |
425 | { | |
426 | case GCC_C_ORACLE_SYMBOL: | |
427 | domain = VAR_DOMAIN; | |
428 | break; | |
429 | case GCC_C_ORACLE_TAG: | |
430 | domain = STRUCT_DOMAIN; | |
431 | break; | |
432 | case GCC_C_ORACLE_LABEL: | |
433 | domain = LABEL_DOMAIN; | |
434 | break; | |
435 | default: | |
436 | gdb_assert_not_reached ("Unrecognized oracle request."); | |
437 | } | |
438 | ||
439 | /* We can't allow exceptions to escape out of this callback. Safest | |
440 | is to simply emit a gcc error. */ | |
492d29ea | 441 | TRY |
bb2ec1b3 | 442 | { |
d12307c1 | 443 | struct block_symbol sym; |
bb2ec1b3 TT |
444 | |
445 | sym = lookup_symbol (identifier, context->base.block, domain, NULL); | |
d12307c1 | 446 | if (sym.symbol != NULL) |
bb2ec1b3 TT |
447 | { |
448 | convert_symbol_sym (context, identifier, sym, domain); | |
449 | found = 1; | |
450 | } | |
451 | else if (domain == VAR_DOMAIN) | |
452 | { | |
453 | struct bound_minimal_symbol bmsym; | |
454 | ||
455 | bmsym = lookup_minimal_symbol (identifier, NULL, NULL); | |
456 | if (bmsym.minsym != NULL) | |
457 | { | |
458 | convert_symbol_bmsym (context, bmsym); | |
459 | found = 1; | |
460 | } | |
461 | } | |
462 | } | |
463 | ||
492d29ea PA |
464 | CATCH (e, RETURN_MASK_ALL) |
465 | { | |
466 | C_CTX (context)->c_ops->error (C_CTX (context), e.message); | |
467 | } | |
468 | END_CATCH | |
bb2ec1b3 TT |
469 | |
470 | if (compile_debug && !found) | |
a4063588 | 471 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
472 | "gcc_convert_symbol \"%s\": lookup_symbol failed\n", |
473 | identifier); | |
474 | return; | |
475 | } | |
476 | ||
477 | /* See compile-internal.h. */ | |
478 | ||
479 | gcc_address | |
480 | gcc_symbol_address (void *datum, struct gcc_c_context *gcc_context, | |
481 | const char *identifier) | |
482 | { | |
9a3c8263 | 483 | struct compile_c_instance *context = (struct compile_c_instance *) datum; |
bb2ec1b3 TT |
484 | gcc_address result = 0; |
485 | int found = 0; | |
486 | ||
487 | /* We can't allow exceptions to escape out of this callback. Safest | |
488 | is to simply emit a gcc error. */ | |
492d29ea | 489 | TRY |
bb2ec1b3 TT |
490 | { |
491 | struct symbol *sym; | |
492 | ||
493 | /* We only need global functions here. */ | |
d12307c1 | 494 | sym = lookup_symbol (identifier, NULL, VAR_DOMAIN, NULL).symbol; |
bb2ec1b3 TT |
495 | if (sym != NULL && SYMBOL_CLASS (sym) == LOC_BLOCK) |
496 | { | |
497 | if (compile_debug) | |
a4063588 | 498 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
499 | "gcc_symbol_address \"%s\": full symbol\n", |
500 | identifier); | |
501 | result = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); | |
081a1c2c JK |
502 | if (TYPE_GNU_IFUNC (SYMBOL_TYPE (sym))) |
503 | result = gnu_ifunc_resolve_addr (target_gdbarch (), result); | |
bb2ec1b3 TT |
504 | found = 1; |
505 | } | |
506 | else | |
507 | { | |
508 | struct bound_minimal_symbol msym; | |
509 | ||
510 | msym = lookup_bound_minimal_symbol (identifier); | |
511 | if (msym.minsym != NULL) | |
512 | { | |
513 | if (compile_debug) | |
a4063588 | 514 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
515 | "gcc_symbol_address \"%s\": minimal " |
516 | "symbol\n", | |
517 | identifier); | |
518 | result = BMSYMBOL_VALUE_ADDRESS (msym); | |
081a1c2c JK |
519 | if (MSYMBOL_TYPE (msym.minsym) == mst_text_gnu_ifunc) |
520 | result = gnu_ifunc_resolve_addr (target_gdbarch (), result); | |
bb2ec1b3 TT |
521 | found = 1; |
522 | } | |
523 | } | |
524 | } | |
525 | ||
492d29ea PA |
526 | CATCH (e, RETURN_MASK_ERROR) |
527 | { | |
528 | C_CTX (context)->c_ops->error (C_CTX (context), e.message); | |
529 | } | |
530 | END_CATCH | |
bb2ec1b3 TT |
531 | |
532 | if (compile_debug && !found) | |
a4063588 | 533 | fprintf_unfiltered (gdb_stdlog, |
bb2ec1b3 TT |
534 | "gcc_symbol_address \"%s\": failed\n", |
535 | identifier); | |
536 | return result; | |
537 | } | |
538 | ||
539 | \f | |
540 | ||
541 | /* A hash function for symbol names. */ | |
542 | ||
543 | static hashval_t | |
544 | hash_symname (const void *a) | |
545 | { | |
9a3c8263 | 546 | const struct symbol *sym = (const struct symbol *) a; |
bb2ec1b3 TT |
547 | |
548 | return htab_hash_string (SYMBOL_NATURAL_NAME (sym)); | |
549 | } | |
550 | ||
551 | /* A comparison function for hash tables that just looks at symbol | |
552 | names. */ | |
553 | ||
554 | static int | |
555 | eq_symname (const void *a, const void *b) | |
556 | { | |
9a3c8263 SM |
557 | const struct symbol *syma = (const struct symbol *) a; |
558 | const struct symbol *symb = (const struct symbol *) b; | |
bb2ec1b3 TT |
559 | |
560 | return strcmp (SYMBOL_NATURAL_NAME (syma), SYMBOL_NATURAL_NAME (symb)) == 0; | |
561 | } | |
562 | ||
563 | /* If a symbol with the same name as SYM is already in HASHTAB, return | |
564 | 1. Otherwise, add SYM to HASHTAB and return 0. */ | |
565 | ||
566 | static int | |
567 | symbol_seen (htab_t hashtab, struct symbol *sym) | |
568 | { | |
569 | void **slot; | |
570 | ||
571 | slot = htab_find_slot (hashtab, sym, INSERT); | |
572 | if (*slot != NULL) | |
573 | return 1; | |
574 | ||
575 | *slot = sym; | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* Generate C code to compute the length of a VLA. */ | |
580 | ||
581 | static void | |
582 | generate_vla_size (struct compile_c_instance *compiler, | |
d7e74731 | 583 | string_file &stream, |
bb2ec1b3 TT |
584 | struct gdbarch *gdbarch, |
585 | unsigned char *registers_used, | |
586 | CORE_ADDR pc, | |
587 | struct type *type, | |
588 | struct symbol *sym) | |
589 | { | |
590 | type = check_typedef (type); | |
591 | ||
aa006118 | 592 | if (TYPE_IS_REFERENCE (type)) |
bb2ec1b3 TT |
593 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
594 | ||
595 | switch (TYPE_CODE (type)) | |
596 | { | |
597 | case TYPE_CODE_RANGE: | |
598 | { | |
599 | if (TYPE_HIGH_BOUND_KIND (type) == PROP_LOCEXPR | |
600 | || TYPE_HIGH_BOUND_KIND (type) == PROP_LOCLIST) | |
601 | { | |
602 | const struct dynamic_prop *prop = &TYPE_RANGE_DATA (type)->high; | |
8f84fb0e | 603 | std::string name = c_get_range_decl_name (prop); |
bb2ec1b3 | 604 | |
8f84fb0e | 605 | dwarf2_compile_property_to_c (stream, name.c_str (), |
bb2ec1b3 TT |
606 | gdbarch, registers_used, |
607 | prop, pc, sym); | |
bb2ec1b3 TT |
608 | } |
609 | } | |
610 | break; | |
611 | ||
612 | case TYPE_CODE_ARRAY: | |
613 | generate_vla_size (compiler, stream, gdbarch, registers_used, pc, | |
614 | TYPE_INDEX_TYPE (type), sym); | |
615 | generate_vla_size (compiler, stream, gdbarch, registers_used, pc, | |
616 | TYPE_TARGET_TYPE (type), sym); | |
617 | break; | |
618 | ||
619 | case TYPE_CODE_UNION: | |
620 | case TYPE_CODE_STRUCT: | |
621 | { | |
622 | int i; | |
623 | ||
624 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
625 | if (!field_is_static (&TYPE_FIELD (type, i))) | |
626 | generate_vla_size (compiler, stream, gdbarch, registers_used, pc, | |
627 | TYPE_FIELD_TYPE (type, i), sym); | |
628 | } | |
629 | break; | |
630 | } | |
631 | } | |
632 | ||
633 | /* Generate C code to compute the address of SYM. */ | |
634 | ||
635 | static void | |
636 | generate_c_for_for_one_variable (struct compile_c_instance *compiler, | |
d7e74731 | 637 | string_file &stream, |
bb2ec1b3 TT |
638 | struct gdbarch *gdbarch, |
639 | unsigned char *registers_used, | |
640 | CORE_ADDR pc, | |
641 | struct symbol *sym) | |
642 | { | |
bb2ec1b3 | 643 | |
492d29ea | 644 | TRY |
bb2ec1b3 TT |
645 | { |
646 | if (is_dynamic_type (SYMBOL_TYPE (sym))) | |
647 | { | |
d7e74731 PA |
648 | /* We need to emit to a temporary buffer in case an error |
649 | occurs in the middle. */ | |
650 | string_file local_file; | |
bb2ec1b3 | 651 | |
d7e74731 | 652 | generate_vla_size (compiler, local_file, gdbarch, registers_used, pc, |
bb2ec1b3 | 653 | SYMBOL_TYPE (sym), sym); |
bb2ec1b3 | 654 | |
d7e74731 | 655 | stream.write (local_file.c_str (), local_file.size ()); |
bb2ec1b3 TT |
656 | } |
657 | ||
658 | if (SYMBOL_COMPUTED_OPS (sym) != NULL) | |
659 | { | |
8f84fb0e | 660 | gdb::unique_xmalloc_ptr<char> generated_name |
6f36b6d2 | 661 | = c_symbol_substitution_name (sym); |
bb2ec1b3 TT |
662 | /* We need to emit to a temporary buffer in case an error |
663 | occurs in the middle. */ | |
d7e74731 | 664 | string_file local_file; |
bb2ec1b3 | 665 | |
bb2ec1b3 TT |
666 | SYMBOL_COMPUTED_OPS (sym)->generate_c_location (sym, local_file, |
667 | gdbarch, | |
668 | registers_used, | |
8f84fb0e TT |
669 | pc, |
670 | generated_name.get ()); | |
d7e74731 | 671 | stream.write (local_file.c_str (), local_file.size ()); |
bb2ec1b3 TT |
672 | } |
673 | else | |
674 | { | |
675 | switch (SYMBOL_CLASS (sym)) | |
676 | { | |
677 | case LOC_REGISTER: | |
678 | case LOC_ARG: | |
679 | case LOC_REF_ARG: | |
680 | case LOC_REGPARM_ADDR: | |
681 | case LOC_LOCAL: | |
682 | error (_("Local symbol unhandled when generating C code.")); | |
683 | ||
684 | case LOC_COMPUTED: | |
685 | gdb_assert_not_reached (_("LOC_COMPUTED variable " | |
686 | "missing a method.")); | |
687 | ||
688 | default: | |
689 | /* Nothing to do for all other cases, as they don't represent | |
690 | local variables. */ | |
691 | break; | |
692 | } | |
693 | } | |
694 | } | |
695 | ||
492d29ea | 696 | CATCH (e, RETURN_MASK_ERROR) |
7556d4a4 PA |
697 | { |
698 | if (compiler->symbol_err_map == NULL) | |
699 | compiler->symbol_err_map = htab_create_alloc (10, | |
700 | hash_symbol_error, | |
701 | eq_symbol_error, | |
702 | del_symbol_error, | |
703 | xcalloc, | |
704 | xfree); | |
705 | insert_symbol_error (compiler->symbol_err_map, sym, e.message); | |
706 | } | |
492d29ea | 707 | END_CATCH |
bb2ec1b3 TT |
708 | } |
709 | ||
b7dc48b4 | 710 | /* See compile-c.h. */ |
bb2ec1b3 | 711 | |
bd923e51 | 712 | gdb::unique_xmalloc_ptr<unsigned char> |
bb2ec1b3 | 713 | generate_c_for_variable_locations (struct compile_c_instance *compiler, |
d7e74731 | 714 | string_file &stream, |
bb2ec1b3 TT |
715 | struct gdbarch *gdbarch, |
716 | const struct block *block, | |
717 | CORE_ADDR pc) | |
718 | { | |
bb2ec1b3 | 719 | const struct block *static_block = block_static_block (block); |
bb2ec1b3 TT |
720 | |
721 | /* If we're already in the static or global block, there is nothing | |
722 | to write. */ | |
723 | if (static_block == NULL || block == static_block) | |
724 | return NULL; | |
725 | ||
bd923e51 KS |
726 | gdb::unique_xmalloc_ptr<unsigned char> registers_used |
727 | (XCNEWVEC (unsigned char, gdbarch_num_regs (gdbarch))); | |
bb2ec1b3 TT |
728 | |
729 | /* Ensure that a given name is only entered once. This reflects the | |
730 | reality of shadowing. */ | |
fc4007c9 TT |
731 | htab_up symhash (htab_create_alloc (1, hash_symname, eq_symname, NULL, |
732 | xcalloc, xfree)); | |
bb2ec1b3 TT |
733 | |
734 | while (1) | |
735 | { | |
736 | struct symbol *sym; | |
737 | struct block_iterator iter; | |
738 | ||
739 | /* Iterate over symbols in this block, generating code to | |
740 | compute the location of each local variable. */ | |
741 | for (sym = block_iterator_first (block, &iter); | |
742 | sym != NULL; | |
743 | sym = block_iterator_next (&iter)) | |
744 | { | |
fc4007c9 | 745 | if (!symbol_seen (symhash.get (), sym)) |
bb2ec1b3 | 746 | generate_c_for_for_one_variable (compiler, stream, gdbarch, |
bd923e51 | 747 | registers_used.get (), pc, sym); |
bb2ec1b3 TT |
748 | } |
749 | ||
750 | /* If we just finished the outermost block of a function, we're | |
751 | done. */ | |
752 | if (BLOCK_FUNCTION (block) != NULL) | |
753 | break; | |
754 | block = BLOCK_SUPERBLOCK (block); | |
755 | } | |
756 | ||
bb2ec1b3 TT |
757 | return registers_used; |
758 | } |