Commit | Line | Data |
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bb2ec1b3 TT |
1 | /* Convert a DWARF location expression to C |
2 | ||
b811d2c2 | 3 | Copyright (C) 2014-2020 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 | #include "defs.h" | |
21 | #include "dwarf2.h" | |
82ca8957 TT |
22 | #include "dwarf2/expr.h" |
23 | #include "dwarf2/loc.h" | |
09ba997f | 24 | #include "dwarf2/read.h" |
bb2ec1b3 TT |
25 | #include "ui-file.h" |
26 | #include "utils.h" | |
27 | #include "compile-internal.h" | |
b7dc48b4 | 28 | #include "compile-c.h" |
bb2ec1b3 TT |
29 | #include "compile.h" |
30 | #include "block.h" | |
82ca8957 | 31 | #include "dwarf2/frame.h" |
268a13a5 | 32 | #include "gdbsupport/gdb_vecs.h" |
bb2ec1b3 | 33 | #include "value.h" |
0d12e84c | 34 | #include "gdbarch.h" |
bb2ec1b3 TT |
35 | |
36 | \f | |
37 | ||
38 | /* Information about a given instruction. */ | |
39 | ||
40 | struct insn_info | |
41 | { | |
42 | /* Stack depth at entry. */ | |
43 | ||
44 | unsigned int depth; | |
45 | ||
46 | /* Whether this instruction has been visited. */ | |
47 | ||
48 | unsigned int visited : 1; | |
49 | ||
50 | /* Whether this instruction needs a label. */ | |
51 | ||
52 | unsigned int label : 1; | |
53 | ||
4aa4e28b TT |
54 | /* Whether this instruction is DW_OP_GNU_push_tls_address or |
55 | DW_OP_form_tls_address. This is a hack until we can add a | |
56 | feature to glibc to let us properly generate code for TLS. */ | |
bb2ec1b3 TT |
57 | |
58 | unsigned int is_tls : 1; | |
59 | }; | |
60 | ||
61 | /* A helper function for compute_stack_depth that does the work. This | |
62 | examines the DWARF expression starting from START and computes | |
63 | stack effects. | |
64 | ||
65 | NEED_TEMPVAR is an out parameter which is set if this expression | |
66 | needs a special temporary variable to be emitted (see the code | |
67 | generator). | |
c6bcad5f | 68 | INFO is a vector of insn_info objects, indexed by offset from the |
bb2ec1b3 TT |
69 | start of the DWARF expression. |
70 | TO_DO is a list of bytecodes which must be examined; it may be | |
71 | added to by this function. | |
72 | BYTE_ORDER and ADDR_SIZE describe this bytecode in the obvious way. | |
73 | OP_PTR and OP_END are the bounds of the DWARF expression. */ | |
74 | ||
75 | static void | |
76 | compute_stack_depth_worker (int start, int *need_tempvar, | |
c6bcad5f | 77 | std::vector<struct insn_info> *info, |
711799d5 | 78 | std::vector<int> *to_do, |
bb2ec1b3 TT |
79 | enum bfd_endian byte_order, unsigned int addr_size, |
80 | const gdb_byte *op_ptr, const gdb_byte *op_end) | |
81 | { | |
82 | const gdb_byte * const base = op_ptr; | |
83 | int stack_depth; | |
84 | ||
85 | op_ptr += start; | |
c6bcad5f TT |
86 | gdb_assert ((*info)[start].visited); |
87 | stack_depth = (*info)[start].depth; | |
bb2ec1b3 TT |
88 | |
89 | while (op_ptr < op_end) | |
90 | { | |
aead7601 | 91 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
bb2ec1b3 TT |
92 | uint64_t reg; |
93 | int64_t offset; | |
94 | int ndx = op_ptr - base; | |
95 | ||
96 | #define SET_CHECK_DEPTH(WHERE) \ | |
c6bcad5f | 97 | if ((*info)[WHERE].visited) \ |
bb2ec1b3 | 98 | { \ |
c6bcad5f | 99 | if ((*info)[WHERE].depth != stack_depth) \ |
bb2ec1b3 TT |
100 | error (_("inconsistent stack depths")); \ |
101 | } \ | |
102 | else \ | |
103 | { \ | |
104 | /* Stack depth not set, so set it. */ \ | |
c6bcad5f TT |
105 | (*info)[WHERE].visited = 1; \ |
106 | (*info)[WHERE].depth = stack_depth; \ | |
bb2ec1b3 TT |
107 | } |
108 | ||
109 | SET_CHECK_DEPTH (ndx); | |
110 | ||
111 | ++op_ptr; | |
112 | ||
113 | switch (op) | |
114 | { | |
115 | case DW_OP_lit0: | |
116 | case DW_OP_lit1: | |
117 | case DW_OP_lit2: | |
118 | case DW_OP_lit3: | |
119 | case DW_OP_lit4: | |
120 | case DW_OP_lit5: | |
121 | case DW_OP_lit6: | |
122 | case DW_OP_lit7: | |
123 | case DW_OP_lit8: | |
124 | case DW_OP_lit9: | |
125 | case DW_OP_lit10: | |
126 | case DW_OP_lit11: | |
127 | case DW_OP_lit12: | |
128 | case DW_OP_lit13: | |
129 | case DW_OP_lit14: | |
130 | case DW_OP_lit15: | |
131 | case DW_OP_lit16: | |
132 | case DW_OP_lit17: | |
133 | case DW_OP_lit18: | |
134 | case DW_OP_lit19: | |
135 | case DW_OP_lit20: | |
136 | case DW_OP_lit21: | |
137 | case DW_OP_lit22: | |
138 | case DW_OP_lit23: | |
139 | case DW_OP_lit24: | |
140 | case DW_OP_lit25: | |
141 | case DW_OP_lit26: | |
142 | case DW_OP_lit27: | |
143 | case DW_OP_lit28: | |
144 | case DW_OP_lit29: | |
145 | case DW_OP_lit30: | |
146 | case DW_OP_lit31: | |
147 | ++stack_depth; | |
148 | break; | |
149 | ||
150 | case DW_OP_addr: | |
151 | op_ptr += addr_size; | |
152 | ++stack_depth; | |
153 | break; | |
154 | ||
155 | case DW_OP_const1u: | |
156 | case DW_OP_const1s: | |
157 | op_ptr += 1; | |
158 | ++stack_depth; | |
159 | break; | |
160 | case DW_OP_const2u: | |
161 | case DW_OP_const2s: | |
162 | op_ptr += 2; | |
163 | ++stack_depth; | |
164 | break; | |
165 | case DW_OP_const4u: | |
166 | case DW_OP_const4s: | |
167 | op_ptr += 4; | |
168 | ++stack_depth; | |
169 | break; | |
170 | case DW_OP_const8u: | |
171 | case DW_OP_const8s: | |
172 | op_ptr += 8; | |
173 | ++stack_depth; | |
174 | break; | |
175 | case DW_OP_constu: | |
176 | case DW_OP_consts: | |
177 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
178 | ++stack_depth; | |
179 | break; | |
180 | ||
181 | case DW_OP_reg0: | |
182 | case DW_OP_reg1: | |
183 | case DW_OP_reg2: | |
184 | case DW_OP_reg3: | |
185 | case DW_OP_reg4: | |
186 | case DW_OP_reg5: | |
187 | case DW_OP_reg6: | |
188 | case DW_OP_reg7: | |
189 | case DW_OP_reg8: | |
190 | case DW_OP_reg9: | |
191 | case DW_OP_reg10: | |
192 | case DW_OP_reg11: | |
193 | case DW_OP_reg12: | |
194 | case DW_OP_reg13: | |
195 | case DW_OP_reg14: | |
196 | case DW_OP_reg15: | |
197 | case DW_OP_reg16: | |
198 | case DW_OP_reg17: | |
199 | case DW_OP_reg18: | |
200 | case DW_OP_reg19: | |
201 | case DW_OP_reg20: | |
202 | case DW_OP_reg21: | |
203 | case DW_OP_reg22: | |
204 | case DW_OP_reg23: | |
205 | case DW_OP_reg24: | |
206 | case DW_OP_reg25: | |
207 | case DW_OP_reg26: | |
208 | case DW_OP_reg27: | |
209 | case DW_OP_reg28: | |
210 | case DW_OP_reg29: | |
211 | case DW_OP_reg30: | |
212 | case DW_OP_reg31: | |
213 | ++stack_depth; | |
214 | break; | |
215 | ||
216 | case DW_OP_regx: | |
217 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); | |
218 | ++stack_depth; | |
219 | break; | |
220 | ||
221 | case DW_OP_breg0: | |
222 | case DW_OP_breg1: | |
223 | case DW_OP_breg2: | |
224 | case DW_OP_breg3: | |
225 | case DW_OP_breg4: | |
226 | case DW_OP_breg5: | |
227 | case DW_OP_breg6: | |
228 | case DW_OP_breg7: | |
229 | case DW_OP_breg8: | |
230 | case DW_OP_breg9: | |
231 | case DW_OP_breg10: | |
232 | case DW_OP_breg11: | |
233 | case DW_OP_breg12: | |
234 | case DW_OP_breg13: | |
235 | case DW_OP_breg14: | |
236 | case DW_OP_breg15: | |
237 | case DW_OP_breg16: | |
238 | case DW_OP_breg17: | |
239 | case DW_OP_breg18: | |
240 | case DW_OP_breg19: | |
241 | case DW_OP_breg20: | |
242 | case DW_OP_breg21: | |
243 | case DW_OP_breg22: | |
244 | case DW_OP_breg23: | |
245 | case DW_OP_breg24: | |
246 | case DW_OP_breg25: | |
247 | case DW_OP_breg26: | |
248 | case DW_OP_breg27: | |
249 | case DW_OP_breg28: | |
250 | case DW_OP_breg29: | |
251 | case DW_OP_breg30: | |
252 | case DW_OP_breg31: | |
253 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
254 | ++stack_depth; | |
255 | break; | |
256 | case DW_OP_bregx: | |
257 | { | |
258 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); | |
259 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
260 | ++stack_depth; | |
261 | } | |
262 | break; | |
263 | case DW_OP_fbreg: | |
264 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
265 | ++stack_depth; | |
266 | break; | |
267 | ||
268 | case DW_OP_dup: | |
269 | ++stack_depth; | |
270 | break; | |
271 | ||
272 | case DW_OP_drop: | |
273 | --stack_depth; | |
274 | break; | |
275 | ||
276 | case DW_OP_pick: | |
277 | ++op_ptr; | |
278 | ++stack_depth; | |
279 | break; | |
280 | ||
281 | case DW_OP_rot: | |
282 | case DW_OP_swap: | |
283 | *need_tempvar = 1; | |
284 | break; | |
285 | ||
286 | case DW_OP_over: | |
287 | ++stack_depth; | |
288 | break; | |
289 | ||
290 | case DW_OP_abs: | |
291 | case DW_OP_neg: | |
292 | case DW_OP_not: | |
293 | case DW_OP_deref: | |
294 | break; | |
295 | ||
296 | case DW_OP_deref_size: | |
297 | ++op_ptr; | |
298 | break; | |
299 | ||
300 | case DW_OP_plus_uconst: | |
301 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); | |
302 | break; | |
303 | ||
304 | case DW_OP_div: | |
305 | case DW_OP_shra: | |
306 | case DW_OP_and: | |
307 | case DW_OP_minus: | |
308 | case DW_OP_mod: | |
309 | case DW_OP_mul: | |
310 | case DW_OP_or: | |
311 | case DW_OP_plus: | |
312 | case DW_OP_shl: | |
313 | case DW_OP_shr: | |
314 | case DW_OP_xor: | |
315 | case DW_OP_le: | |
316 | case DW_OP_ge: | |
317 | case DW_OP_eq: | |
318 | case DW_OP_lt: | |
319 | case DW_OP_gt: | |
320 | case DW_OP_ne: | |
321 | --stack_depth; | |
322 | break; | |
323 | ||
324 | case DW_OP_call_frame_cfa: | |
325 | ++stack_depth; | |
326 | break; | |
327 | ||
328 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 329 | case DW_OP_form_tls_address: |
c6bcad5f | 330 | (*info)[ndx].is_tls = 1; |
bb2ec1b3 TT |
331 | break; |
332 | ||
333 | case DW_OP_skip: | |
334 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
335 | op_ptr += 2; | |
336 | offset = op_ptr + offset - base; | |
337 | /* If the destination has not been seen yet, add it to the | |
338 | to-do list. */ | |
c6bcad5f | 339 | if (!(*info)[offset].visited) |
711799d5 | 340 | to_do->push_back (offset); |
bb2ec1b3 | 341 | SET_CHECK_DEPTH (offset); |
c6bcad5f | 342 | (*info)[offset].label = 1; |
bb2ec1b3 TT |
343 | /* We're done with this line of code. */ |
344 | return; | |
345 | ||
346 | case DW_OP_bra: | |
347 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
348 | op_ptr += 2; | |
349 | offset = op_ptr + offset - base; | |
350 | --stack_depth; | |
351 | /* If the destination has not been seen yet, add it to the | |
352 | to-do list. */ | |
c6bcad5f | 353 | if (!(*info)[offset].visited) |
711799d5 | 354 | to_do->push_back (offset); |
bb2ec1b3 | 355 | SET_CHECK_DEPTH (offset); |
c6bcad5f | 356 | (*info)[offset].label = 1; |
bb2ec1b3 TT |
357 | break; |
358 | ||
359 | case DW_OP_nop: | |
360 | break; | |
361 | ||
362 | default: | |
363 | error (_("unhandled DWARF op: %s"), get_DW_OP_name (op)); | |
364 | } | |
365 | } | |
366 | ||
367 | gdb_assert (op_ptr == op_end); | |
368 | ||
369 | #undef SET_CHECK_DEPTH | |
370 | } | |
371 | ||
372 | /* Compute the maximum needed stack depth of a DWARF expression, and | |
373 | some other information as well. | |
374 | ||
375 | BYTE_ORDER and ADDR_SIZE describe this bytecode in the obvious way. | |
376 | NEED_TEMPVAR is an out parameter which is set if this expression | |
377 | needs a special temporary variable to be emitted (see the code | |
378 | generator). | |
379 | IS_TLS is an out parameter which is set if this expression refers | |
380 | to a TLS variable. | |
381 | OP_PTR and OP_END are the bounds of the DWARF expression. | |
382 | INITIAL_DEPTH is the initial depth of the DWARF expression stack. | |
383 | INFO is an array of insn_info objects, indexed by offset from the | |
384 | start of the DWARF expression. | |
385 | ||
386 | This returns the maximum stack depth. */ | |
387 | ||
388 | static int | |
389 | compute_stack_depth (enum bfd_endian byte_order, unsigned int addr_size, | |
390 | int *need_tempvar, int *is_tls, | |
391 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
392 | int initial_depth, | |
c6bcad5f | 393 | std::vector<struct insn_info> *info) |
bb2ec1b3 | 394 | { |
711799d5 | 395 | std::vector<int> to_do; |
bb2ec1b3 TT |
396 | int stack_depth, i; |
397 | ||
c6bcad5f | 398 | info->resize (op_end - op_ptr); |
bb2ec1b3 | 399 | |
711799d5 | 400 | to_do.push_back (0); |
bb2ec1b3 TT |
401 | (*info)[0].depth = initial_depth; |
402 | (*info)[0].visited = 1; | |
403 | ||
711799d5 | 404 | while (!to_do.empty ()) |
bb2ec1b3 | 405 | { |
711799d5 TT |
406 | int ndx = to_do.back (); |
407 | to_do.pop_back (); | |
bb2ec1b3 | 408 | |
c6bcad5f | 409 | compute_stack_depth_worker (ndx, need_tempvar, info, &to_do, |
bb2ec1b3 TT |
410 | byte_order, addr_size, |
411 | op_ptr, op_end); | |
412 | } | |
413 | ||
414 | stack_depth = 0; | |
415 | *is_tls = 0; | |
416 | for (i = 0; i < op_end - op_ptr; ++i) | |
417 | { | |
418 | if ((*info)[i].depth > stack_depth) | |
419 | stack_depth = (*info)[i].depth; | |
420 | if ((*info)[i].is_tls) | |
421 | *is_tls = 1; | |
422 | } | |
423 | ||
bb2ec1b3 TT |
424 | return stack_depth + 1; |
425 | } | |
426 | ||
427 | \f | |
428 | ||
429 | #define GCC_UINTPTR "__gdb_uintptr" | |
430 | #define GCC_INTPTR "__gdb_intptr" | |
431 | ||
432 | /* Emit code to push a constant. */ | |
433 | ||
434 | static void | |
d82b3862 | 435 | push (int indent, string_file *stream, ULONGEST l) |
bb2ec1b3 | 436 | { |
d82b3862 | 437 | fprintfi_filtered (indent, stream, |
3a9558c4 | 438 | "__gdb_stack[++__gdb_tos] = (" GCC_UINTPTR ") %s;\n", |
bb2ec1b3 TT |
439 | hex_string (l)); |
440 | } | |
441 | ||
442 | /* Emit code to push an arbitrary expression. This works like | |
443 | printf. */ | |
444 | ||
d82b3862 | 445 | static void pushf (int indent, string_file *stream, const char *format, ...) |
77b64a49 PA |
446 | ATTRIBUTE_PRINTF (3, 4); |
447 | ||
bb2ec1b3 | 448 | static void |
d82b3862 | 449 | pushf (int indent, string_file *stream, const char *format, ...) |
bb2ec1b3 TT |
450 | { |
451 | va_list args; | |
452 | ||
d82b3862 | 453 | fprintfi_filtered (indent, stream, "__gdb_stack[__gdb_tos + 1] = "); |
bb2ec1b3 | 454 | va_start (args, format); |
d82b3862 | 455 | stream->vprintf (format, args); |
bb2ec1b3 | 456 | va_end (args); |
d82b3862 | 457 | stream->puts (";\n"); |
bb2ec1b3 | 458 | |
d82b3862 | 459 | fprintfi_filtered (indent, stream, "++__gdb_tos;\n"); |
bb2ec1b3 TT |
460 | } |
461 | ||
462 | /* Emit code for a unary expression -- one which operates in-place on | |
463 | the top-of-stack. This works like printf. */ | |
464 | ||
d82b3862 | 465 | static void unary (int indent, string_file *stream, const char *format, ...) |
77b64a49 PA |
466 | ATTRIBUTE_PRINTF (3, 4); |
467 | ||
bb2ec1b3 | 468 | static void |
d82b3862 | 469 | unary (int indent, string_file *stream, const char *format, ...) |
bb2ec1b3 TT |
470 | { |
471 | va_list args; | |
472 | ||
d82b3862 | 473 | fprintfi_filtered (indent, stream, "__gdb_stack[__gdb_tos] = "); |
bb2ec1b3 | 474 | va_start (args, format); |
d82b3862 | 475 | stream->vprintf (format, args); |
bb2ec1b3 | 476 | va_end (args); |
d82b3862 | 477 | stream->puts (";\n"); |
bb2ec1b3 TT |
478 | } |
479 | ||
480 | /* Emit code for a unary expression -- one which uses the top two | |
481 | stack items, popping the topmost one. This works like printf. */ | |
d82b3862 | 482 | static void binary (int indent, string_file *stream, const char *format, ...) |
77b64a49 | 483 | ATTRIBUTE_PRINTF (3, 4); |
bb2ec1b3 TT |
484 | |
485 | static void | |
d82b3862 | 486 | binary (int indent, string_file *stream, const char *format, ...) |
bb2ec1b3 TT |
487 | { |
488 | va_list args; | |
489 | ||
d82b3862 | 490 | fprintfi_filtered (indent, stream, "__gdb_stack[__gdb_tos - 1] = "); |
bb2ec1b3 | 491 | va_start (args, format); |
d82b3862 | 492 | stream->vprintf (format, args); |
bb2ec1b3 | 493 | va_end (args); |
d82b3862 SM |
494 | stream->puts (";\n"); |
495 | fprintfi_filtered (indent, stream, "--__gdb_tos;\n"); | |
bb2ec1b3 TT |
496 | } |
497 | ||
498 | /* Print the name of a label given its "SCOPE", an arbitrary integer | |
499 | used for uniqueness, and its TARGET, the bytecode offset | |
500 | corresponding to the label's point of definition. */ | |
501 | ||
502 | static void | |
d82b3862 | 503 | print_label (string_file *stream, unsigned int scope, int target) |
bb2ec1b3 | 504 | { |
d82b3862 | 505 | stream->printf ("__label_%u_%s", scope, pulongest (target)); |
bb2ec1b3 TT |
506 | } |
507 | ||
508 | /* Emit code that pushes a register's address on the stack. | |
509 | REGISTERS_USED is an out parameter which is updated to note which | |
510 | register was needed by this expression. */ | |
511 | ||
512 | static void | |
d82b3862 | 513 | pushf_register_address (int indent, string_file *stream, |
bb2ec1b3 TT |
514 | unsigned char *registers_used, |
515 | struct gdbarch *gdbarch, int regnum) | |
516 | { | |
8f84fb0e | 517 | std::string regname = compile_register_name_mangled (gdbarch, regnum); |
bb2ec1b3 TT |
518 | |
519 | registers_used[regnum] = 1; | |
3a9558c4 JK |
520 | pushf (indent, stream, |
521 | "(" GCC_UINTPTR ") &" COMPILE_I_SIMPLE_REGISTER_ARG_NAME "->%s", | |
8f84fb0e | 522 | regname.c_str ()); |
bb2ec1b3 TT |
523 | } |
524 | ||
525 | /* Emit code that pushes a register's value on the stack. | |
526 | REGISTERS_USED is an out parameter which is updated to note which | |
527 | register was needed by this expression. OFFSET is added to the | |
528 | register's value before it is pushed. */ | |
529 | ||
530 | static void | |
d82b3862 | 531 | pushf_register (int indent, string_file *stream, |
bb2ec1b3 TT |
532 | unsigned char *registers_used, |
533 | struct gdbarch *gdbarch, int regnum, uint64_t offset) | |
534 | { | |
8f84fb0e | 535 | std::string regname = compile_register_name_mangled (gdbarch, regnum); |
bb2ec1b3 TT |
536 | |
537 | registers_used[regnum] = 1; | |
538 | if (offset == 0) | |
539 | pushf (indent, stream, COMPILE_I_SIMPLE_REGISTER_ARG_NAME "->%s", | |
8f84fb0e | 540 | regname.c_str ()); |
bb2ec1b3 | 541 | else |
3a9558c4 JK |
542 | pushf (indent, stream, |
543 | COMPILE_I_SIMPLE_REGISTER_ARG_NAME "->%s + (" GCC_UINTPTR ") %s", | |
8f84fb0e | 544 | regname.c_str (), hex_string (offset)); |
bb2ec1b3 TT |
545 | } |
546 | ||
547 | /* Compile a DWARF expression to C code. | |
548 | ||
549 | INDENT is the indentation level to use. | |
550 | STREAM is the stream where the code should be written. | |
551 | ||
552 | TYPE_NAME names the type of the result of the DWARF expression. | |
553 | For locations this is "void *" but for array bounds it will be an | |
554 | integer type. | |
555 | ||
556 | RESULT_NAME is the name of a variable in the resulting C code. The | |
557 | result of the expression will be assigned to this variable. | |
558 | ||
559 | SYM is the symbol corresponding to this expression. | |
560 | PC is the location at which the expression is being evaluated. | |
561 | ARCH is the architecture to use. | |
562 | ||
563 | REGISTERS_USED is an out parameter which is updated to note which | |
564 | registers were needed by this expression. | |
565 | ||
566 | ADDR_SIZE is the DWARF address size to use. | |
567 | ||
568 | OPT_PTR and OP_END are the bounds of the DWARF expression. | |
569 | ||
570 | If non-NULL, INITIAL points to an initial value to write to the | |
571 | stack. If NULL, no initial value is written. | |
572 | ||
573 | PER_CU is the per-CU object used for looking up various other | |
574 | things. */ | |
575 | ||
576 | static void | |
d82b3862 | 577 | do_compile_dwarf_expr_to_c (int indent, string_file *stream, |
bb2ec1b3 TT |
578 | const char *type_name, |
579 | const char *result_name, | |
580 | struct symbol *sym, CORE_ADDR pc, | |
581 | struct gdbarch *arch, | |
582 | unsigned char *registers_used, | |
583 | unsigned int addr_size, | |
584 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
585 | CORE_ADDR *initial, | |
586 | struct dwarf2_per_cu_data *per_cu) | |
587 | { | |
588 | /* We keep a counter so that labels and other objects we create have | |
589 | unique names. */ | |
590 | static unsigned int scope; | |
591 | ||
592 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
593 | const gdb_byte * const base = op_ptr; | |
594 | int need_tempvar = 0; | |
595 | int is_tls = 0; | |
c6bcad5f | 596 | std::vector<struct insn_info> info; |
bb2ec1b3 TT |
597 | int stack_depth; |
598 | ||
599 | ++scope; | |
600 | ||
d82b3862 | 601 | fprintfi_filtered (indent, stream, "__attribute__ ((unused)) %s %s;\n", |
3a9558c4 | 602 | type_name, result_name); |
d82b3862 | 603 | fprintfi_filtered (indent, stream, "{\n"); |
bb2ec1b3 TT |
604 | indent += 2; |
605 | ||
606 | stack_depth = compute_stack_depth (byte_order, addr_size, | |
607 | &need_tempvar, &is_tls, | |
608 | op_ptr, op_end, initial != NULL, | |
609 | &info); | |
bb2ec1b3 TT |
610 | |
611 | /* This is a hack until we can add a feature to glibc to let us | |
612 | properly generate code for TLS. You might think we could emit | |
613 | the address in the ordinary course of translating | |
614 | DW_OP_GNU_push_tls_address, but since the operand appears on the | |
615 | stack, it is relatively hard to find, and the idea of calling | |
616 | target_translate_tls_address with OFFSET==0 and then adding the | |
617 | offset by hand seemed too hackish. */ | |
618 | if (is_tls) | |
619 | { | |
620 | struct frame_info *frame = get_selected_frame (NULL); | |
621 | struct value *val; | |
622 | ||
623 | if (frame == NULL) | |
624 | error (_("Symbol \"%s\" cannot be used because " | |
625 | "there is no selected frame"), | |
987012b8 | 626 | sym->print_name ()); |
bb2ec1b3 | 627 | |
63e43d3a | 628 | val = read_var_value (sym, NULL, frame); |
bb2ec1b3 TT |
629 | if (VALUE_LVAL (val) != lval_memory) |
630 | error (_("Symbol \"%s\" cannot be used for compilation evaluation " | |
631 | "as its address has not been found."), | |
987012b8 | 632 | sym->print_name ()); |
bb2ec1b3 TT |
633 | |
634 | warning (_("Symbol \"%s\" is thread-local and currently can only " | |
635 | "be referenced from the current thread in " | |
636 | "compiled code."), | |
987012b8 | 637 | sym->print_name ()); |
bb2ec1b3 | 638 | |
d82b3862 | 639 | fprintfi_filtered (indent, stream, "%s = %s;\n", |
bb2ec1b3 TT |
640 | result_name, |
641 | core_addr_to_string (value_address (val))); | |
d82b3862 | 642 | fprintfi_filtered (indent - 2, stream, "}\n"); |
bb2ec1b3 TT |
643 | return; |
644 | } | |
645 | ||
d82b3862 | 646 | fprintfi_filtered (indent, stream, GCC_UINTPTR " __gdb_stack[%d];\n", |
bb2ec1b3 TT |
647 | stack_depth); |
648 | ||
649 | if (need_tempvar) | |
d82b3862 SM |
650 | fprintfi_filtered (indent, stream, GCC_UINTPTR " __gdb_tmp;\n"); |
651 | fprintfi_filtered (indent, stream, "int __gdb_tos = -1;\n"); | |
bb2ec1b3 TT |
652 | |
653 | if (initial != NULL) | |
77b64a49 | 654 | pushf (indent, stream, "%s", core_addr_to_string (*initial)); |
bb2ec1b3 TT |
655 | |
656 | while (op_ptr < op_end) | |
657 | { | |
aead7601 | 658 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
bb2ec1b3 TT |
659 | uint64_t uoffset, reg; |
660 | int64_t offset; | |
661 | ||
d82b3862 | 662 | print_spaces (indent - 2, stream); |
bb2ec1b3 TT |
663 | if (info[op_ptr - base].label) |
664 | { | |
665 | print_label (stream, scope, op_ptr - base); | |
d82b3862 | 666 | stream->puts (":;"); |
bb2ec1b3 | 667 | } |
d82b3862 | 668 | stream->printf ("/* %s */\n", get_DW_OP_name (op)); |
bb2ec1b3 TT |
669 | |
670 | /* This is handy for debugging the generated code: | |
671 | fprintf_filtered (stream, "if (__gdb_tos != %d) abort ();\n", | |
672 | (int) info[op_ptr - base].depth - 1); | |
673 | */ | |
674 | ||
675 | ++op_ptr; | |
676 | ||
677 | switch (op) | |
678 | { | |
679 | case DW_OP_lit0: | |
680 | case DW_OP_lit1: | |
681 | case DW_OP_lit2: | |
682 | case DW_OP_lit3: | |
683 | case DW_OP_lit4: | |
684 | case DW_OP_lit5: | |
685 | case DW_OP_lit6: | |
686 | case DW_OP_lit7: | |
687 | case DW_OP_lit8: | |
688 | case DW_OP_lit9: | |
689 | case DW_OP_lit10: | |
690 | case DW_OP_lit11: | |
691 | case DW_OP_lit12: | |
692 | case DW_OP_lit13: | |
693 | case DW_OP_lit14: | |
694 | case DW_OP_lit15: | |
695 | case DW_OP_lit16: | |
696 | case DW_OP_lit17: | |
697 | case DW_OP_lit18: | |
698 | case DW_OP_lit19: | |
699 | case DW_OP_lit20: | |
700 | case DW_OP_lit21: | |
701 | case DW_OP_lit22: | |
702 | case DW_OP_lit23: | |
703 | case DW_OP_lit24: | |
704 | case DW_OP_lit25: | |
705 | case DW_OP_lit26: | |
706 | case DW_OP_lit27: | |
707 | case DW_OP_lit28: | |
708 | case DW_OP_lit29: | |
709 | case DW_OP_lit30: | |
710 | case DW_OP_lit31: | |
711 | push (indent, stream, op - DW_OP_lit0); | |
712 | break; | |
713 | ||
714 | case DW_OP_addr: | |
266934d1 | 715 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
bb2ec1b3 TT |
716 | op_ptr += addr_size; |
717 | /* Some versions of GCC emit DW_OP_addr before | |
718 | DW_OP_GNU_push_tls_address. In this case the value is an | |
719 | index, not an address. We don't support things like | |
720 | branching between the address and the TLS op. */ | |
721 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
09ba997f | 722 | uoffset += per_cu->text_offset (); |
bb2ec1b3 TT |
723 | push (indent, stream, uoffset); |
724 | break; | |
725 | ||
726 | case DW_OP_const1u: | |
727 | push (indent, stream, | |
728 | extract_unsigned_integer (op_ptr, 1, byte_order)); | |
729 | op_ptr += 1; | |
730 | break; | |
731 | case DW_OP_const1s: | |
732 | push (indent, stream, | |
733 | extract_signed_integer (op_ptr, 1, byte_order)); | |
734 | op_ptr += 1; | |
735 | break; | |
736 | case DW_OP_const2u: | |
737 | push (indent, stream, | |
738 | extract_unsigned_integer (op_ptr, 2, byte_order)); | |
739 | op_ptr += 2; | |
740 | break; | |
741 | case DW_OP_const2s: | |
742 | push (indent, stream, | |
743 | extract_signed_integer (op_ptr, 2, byte_order)); | |
744 | op_ptr += 2; | |
745 | break; | |
746 | case DW_OP_const4u: | |
747 | push (indent, stream, | |
748 | extract_unsigned_integer (op_ptr, 4, byte_order)); | |
749 | op_ptr += 4; | |
750 | break; | |
751 | case DW_OP_const4s: | |
752 | push (indent, stream, | |
753 | extract_signed_integer (op_ptr, 4, byte_order)); | |
754 | op_ptr += 4; | |
755 | break; | |
756 | case DW_OP_const8u: | |
757 | push (indent, stream, | |
758 | extract_unsigned_integer (op_ptr, 8, byte_order)); | |
759 | op_ptr += 8; | |
760 | break; | |
761 | case DW_OP_const8s: | |
762 | push (indent, stream, | |
763 | extract_signed_integer (op_ptr, 8, byte_order)); | |
764 | op_ptr += 8; | |
765 | break; | |
766 | case DW_OP_constu: | |
767 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); | |
768 | push (indent, stream, uoffset); | |
769 | break; | |
770 | case DW_OP_consts: | |
771 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
772 | push (indent, stream, offset); | |
773 | break; | |
774 | ||
775 | case DW_OP_reg0: | |
776 | case DW_OP_reg1: | |
777 | case DW_OP_reg2: | |
778 | case DW_OP_reg3: | |
779 | case DW_OP_reg4: | |
780 | case DW_OP_reg5: | |
781 | case DW_OP_reg6: | |
782 | case DW_OP_reg7: | |
783 | case DW_OP_reg8: | |
784 | case DW_OP_reg9: | |
785 | case DW_OP_reg10: | |
786 | case DW_OP_reg11: | |
787 | case DW_OP_reg12: | |
788 | case DW_OP_reg13: | |
789 | case DW_OP_reg14: | |
790 | case DW_OP_reg15: | |
791 | case DW_OP_reg16: | |
792 | case DW_OP_reg17: | |
793 | case DW_OP_reg18: | |
794 | case DW_OP_reg19: | |
795 | case DW_OP_reg20: | |
796 | case DW_OP_reg21: | |
797 | case DW_OP_reg22: | |
798 | case DW_OP_reg23: | |
799 | case DW_OP_reg24: | |
800 | case DW_OP_reg25: | |
801 | case DW_OP_reg26: | |
802 | case DW_OP_reg27: | |
803 | case DW_OP_reg28: | |
804 | case DW_OP_reg29: | |
805 | case DW_OP_reg30: | |
806 | case DW_OP_reg31: | |
807 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
808 | pushf_register_address (indent, stream, registers_used, arch, | |
0fde2c53 DE |
809 | dwarf_reg_to_regnum_or_error |
810 | (arch, op - DW_OP_reg0)); | |
bb2ec1b3 TT |
811 | break; |
812 | ||
813 | case DW_OP_regx: | |
814 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); | |
815 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
816 | pushf_register_address (indent, stream, registers_used, arch, | |
0fde2c53 | 817 | dwarf_reg_to_regnum_or_error (arch, reg)); |
bb2ec1b3 TT |
818 | break; |
819 | ||
820 | case DW_OP_breg0: | |
821 | case DW_OP_breg1: | |
822 | case DW_OP_breg2: | |
823 | case DW_OP_breg3: | |
824 | case DW_OP_breg4: | |
825 | case DW_OP_breg5: | |
826 | case DW_OP_breg6: | |
827 | case DW_OP_breg7: | |
828 | case DW_OP_breg8: | |
829 | case DW_OP_breg9: | |
830 | case DW_OP_breg10: | |
831 | case DW_OP_breg11: | |
832 | case DW_OP_breg12: | |
833 | case DW_OP_breg13: | |
834 | case DW_OP_breg14: | |
835 | case DW_OP_breg15: | |
836 | case DW_OP_breg16: | |
837 | case DW_OP_breg17: | |
838 | case DW_OP_breg18: | |
839 | case DW_OP_breg19: | |
840 | case DW_OP_breg20: | |
841 | case DW_OP_breg21: | |
842 | case DW_OP_breg22: | |
843 | case DW_OP_breg23: | |
844 | case DW_OP_breg24: | |
845 | case DW_OP_breg25: | |
846 | case DW_OP_breg26: | |
847 | case DW_OP_breg27: | |
848 | case DW_OP_breg28: | |
849 | case DW_OP_breg29: | |
850 | case DW_OP_breg30: | |
851 | case DW_OP_breg31: | |
852 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
853 | pushf_register (indent, stream, registers_used, arch, | |
0fde2c53 DE |
854 | dwarf_reg_to_regnum_or_error (arch, |
855 | op - DW_OP_breg0), | |
bb2ec1b3 TT |
856 | offset); |
857 | break; | |
858 | case DW_OP_bregx: | |
859 | { | |
860 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); | |
861 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
862 | pushf_register (indent, stream, registers_used, arch, | |
0fde2c53 | 863 | dwarf_reg_to_regnum_or_error (arch, reg), offset); |
bb2ec1b3 TT |
864 | } |
865 | break; | |
866 | case DW_OP_fbreg: | |
867 | { | |
868 | const gdb_byte *datastart; | |
869 | size_t datalen; | |
870 | const struct block *b; | |
871 | struct symbol *framefunc; | |
872 | char fb_name[50]; | |
873 | ||
874 | b = block_for_pc (pc); | |
875 | ||
876 | if (!b) | |
877 | error (_("No block found for address")); | |
878 | ||
879 | framefunc = block_linkage_function (b); | |
880 | ||
881 | if (!framefunc) | |
882 | error (_("No function found for block")); | |
883 | ||
884 | func_get_frame_base_dwarf_block (framefunc, pc, | |
885 | &datastart, &datalen); | |
886 | ||
887 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
888 | ||
889 | /* Generate a unique-enough name, in case the frame base | |
890 | is computed multiple times in this expression. */ | |
891 | xsnprintf (fb_name, sizeof (fb_name), "__frame_base_%ld", | |
892 | (long) (op_ptr - base)); | |
893 | ||
894 | do_compile_dwarf_expr_to_c (indent, stream, | |
3a9558c4 | 895 | GCC_UINTPTR, fb_name, |
bb2ec1b3 TT |
896 | sym, pc, |
897 | arch, registers_used, addr_size, | |
898 | datastart, datastart + datalen, | |
899 | NULL, per_cu); | |
900 | ||
901 | pushf (indent, stream, "%s + %s", fb_name, hex_string (offset)); | |
902 | } | |
903 | break; | |
904 | ||
905 | case DW_OP_dup: | |
906 | pushf (indent, stream, "__gdb_stack[__gdb_tos]"); | |
907 | break; | |
908 | ||
909 | case DW_OP_drop: | |
d82b3862 | 910 | fprintfi_filtered (indent, stream, "--__gdb_tos;\n"); |
bb2ec1b3 TT |
911 | break; |
912 | ||
913 | case DW_OP_pick: | |
914 | offset = *op_ptr++; | |
77b64a49 PA |
915 | pushf (indent, stream, "__gdb_stack[__gdb_tos - %s]", |
916 | plongest (offset)); | |
bb2ec1b3 TT |
917 | break; |
918 | ||
919 | case DW_OP_swap: | |
d82b3862 | 920 | fprintfi_filtered (indent, stream, |
bb2ec1b3 | 921 | "__gdb_tmp = __gdb_stack[__gdb_tos - 1];\n"); |
d82b3862 | 922 | fprintfi_filtered (indent, stream, |
bb2ec1b3 TT |
923 | "__gdb_stack[__gdb_tos - 1] = " |
924 | "__gdb_stack[__gdb_tos];\n"); | |
d82b3862 SM |
925 | fprintfi_filtered (indent, stream, ("__gdb_stack[__gdb_tos] = " |
926 | "__gdb_tmp;\n")); | |
bb2ec1b3 TT |
927 | break; |
928 | ||
929 | case DW_OP_over: | |
930 | pushf (indent, stream, "__gdb_stack[__gdb_tos - 1]"); | |
931 | break; | |
932 | ||
933 | case DW_OP_rot: | |
d82b3862 SM |
934 | fprintfi_filtered (indent, stream, ("__gdb_tmp = " |
935 | "__gdb_stack[__gdb_tos];\n")); | |
936 | fprintfi_filtered (indent, stream, | |
bb2ec1b3 TT |
937 | "__gdb_stack[__gdb_tos] = " |
938 | "__gdb_stack[__gdb_tos - 1];\n"); | |
d82b3862 | 939 | fprintfi_filtered (indent, stream, |
bb2ec1b3 TT |
940 | "__gdb_stack[__gdb_tos - 1] = " |
941 | "__gdb_stack[__gdb_tos -2];\n"); | |
d82b3862 | 942 | fprintfi_filtered (indent, stream, "__gdb_stack[__gdb_tos - 2] = " |
bb2ec1b3 TT |
943 | "__gdb_tmp;\n"); |
944 | break; | |
945 | ||
946 | case DW_OP_deref: | |
947 | case DW_OP_deref_size: | |
948 | { | |
949 | int size; | |
950 | const char *mode; | |
951 | ||
952 | if (op == DW_OP_deref_size) | |
953 | size = *op_ptr++; | |
954 | else | |
955 | size = addr_size; | |
956 | ||
957 | mode = c_get_mode_for_size (size); | |
958 | if (mode == NULL) | |
959 | error (_("Unsupported size %d in %s"), | |
960 | size, get_DW_OP_name (op)); | |
961 | ||
962 | /* Cast to a pointer of the desired type, then | |
963 | dereference. */ | |
d82b3862 | 964 | fprintfi_filtered (indent, stream, |
bb2ec1b3 TT |
965 | "__gdb_stack[__gdb_tos] = " |
966 | "*((__gdb_int_%s *) " | |
967 | "__gdb_stack[__gdb_tos]);\n", | |
968 | mode); | |
969 | } | |
970 | break; | |
971 | ||
972 | case DW_OP_abs: | |
973 | unary (indent, stream, | |
974 | "((" GCC_INTPTR ") __gdb_stack[__gdb_tos]) < 0 ? " | |
975 | "-__gdb_stack[__gdb_tos] : __gdb_stack[__gdb_tos]"); | |
976 | break; | |
977 | ||
978 | case DW_OP_neg: | |
979 | unary (indent, stream, "-__gdb_stack[__gdb_tos]"); | |
980 | break; | |
981 | ||
982 | case DW_OP_not: | |
983 | unary (indent, stream, "~__gdb_stack[__gdb_tos]"); | |
984 | break; | |
985 | ||
986 | case DW_OP_plus_uconst: | |
987 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); | |
988 | unary (indent, stream, "__gdb_stack[__gdb_tos] + %s", | |
989 | hex_string (reg)); | |
990 | break; | |
991 | ||
992 | case DW_OP_div: | |
993 | binary (indent, stream, ("((" GCC_INTPTR | |
994 | ") __gdb_stack[__gdb_tos-1]) / ((" | |
995 | GCC_INTPTR ") __gdb_stack[__gdb_tos])")); | |
996 | break; | |
997 | ||
998 | case DW_OP_shra: | |
999 | binary (indent, stream, | |
1000 | "((" GCC_INTPTR ") __gdb_stack[__gdb_tos-1]) >> " | |
1001 | "__gdb_stack[__gdb_tos]"); | |
1002 | break; | |
1003 | ||
1004 | #define BINARY(OP) \ | |
77b64a49 PA |
1005 | binary (indent, stream, "%s", "__gdb_stack[__gdb_tos-1] " #OP \ |
1006 | " __gdb_stack[__gdb_tos]"); \ | |
bb2ec1b3 TT |
1007 | break |
1008 | ||
1009 | case DW_OP_and: | |
1010 | BINARY (&); | |
1011 | case DW_OP_minus: | |
1012 | BINARY (-); | |
1013 | case DW_OP_mod: | |
1014 | BINARY (%); | |
1015 | case DW_OP_mul: | |
1016 | BINARY (*); | |
1017 | case DW_OP_or: | |
1018 | BINARY (|); | |
1019 | case DW_OP_plus: | |
1020 | BINARY (+); | |
1021 | case DW_OP_shl: | |
1022 | BINARY (<<); | |
1023 | case DW_OP_shr: | |
1024 | BINARY (>>); | |
1025 | case DW_OP_xor: | |
1026 | BINARY (^); | |
1027 | #undef BINARY | |
1028 | ||
1029 | #define COMPARE(OP) \ | |
1030 | binary (indent, stream, \ | |
1031 | "(((" GCC_INTPTR ") __gdb_stack[__gdb_tos-1]) " #OP \ | |
1032 | " ((" GCC_INTPTR \ | |
1033 | ") __gdb_stack[__gdb_tos]))"); \ | |
1034 | break | |
1035 | ||
1036 | case DW_OP_le: | |
1037 | COMPARE (<=); | |
1038 | case DW_OP_ge: | |
1039 | COMPARE (>=); | |
1040 | case DW_OP_eq: | |
1041 | COMPARE (==); | |
1042 | case DW_OP_lt: | |
1043 | COMPARE (<); | |
1044 | case DW_OP_gt: | |
1045 | COMPARE (>); | |
1046 | case DW_OP_ne: | |
1047 | COMPARE (!=); | |
1048 | #undef COMPARE | |
1049 | ||
1050 | case DW_OP_call_frame_cfa: | |
1051 | { | |
1052 | int regnum; | |
1053 | CORE_ADDR text_offset; | |
1054 | LONGEST off; | |
1055 | const gdb_byte *cfa_start, *cfa_end; | |
1056 | ||
1057 | if (dwarf2_fetch_cfa_info (arch, pc, per_cu, | |
1058 | ®num, &off, | |
1059 | &text_offset, &cfa_start, &cfa_end)) | |
1060 | { | |
1061 | /* Register. */ | |
1062 | pushf_register (indent, stream, registers_used, arch, regnum, | |
1063 | off); | |
1064 | } | |
1065 | else | |
1066 | { | |
1067 | /* Another expression. */ | |
1068 | char cfa_name[50]; | |
1069 | ||
1070 | /* Generate a unique-enough name, in case the CFA is | |
1071 | computed multiple times in this expression. */ | |
1072 | xsnprintf (cfa_name, sizeof (cfa_name), | |
1073 | "__cfa_%ld", (long) (op_ptr - base)); | |
1074 | ||
1075 | do_compile_dwarf_expr_to_c (indent, stream, | |
3a9558c4 | 1076 | GCC_UINTPTR, cfa_name, |
bb2ec1b3 TT |
1077 | sym, pc, arch, registers_used, |
1078 | addr_size, | |
1079 | cfa_start, cfa_end, | |
1080 | &text_offset, per_cu); | |
77b64a49 | 1081 | pushf (indent, stream, "%s", cfa_name); |
bb2ec1b3 TT |
1082 | } |
1083 | } | |
1084 | ||
1085 | break; | |
1086 | ||
1087 | case DW_OP_skip: | |
1088 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
1089 | op_ptr += 2; | |
d82b3862 | 1090 | fprintfi_filtered (indent, stream, "goto "); |
bb2ec1b3 | 1091 | print_label (stream, scope, op_ptr + offset - base); |
d82b3862 | 1092 | stream->puts (";\n"); |
bb2ec1b3 TT |
1093 | break; |
1094 | ||
1095 | case DW_OP_bra: | |
1096 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
1097 | op_ptr += 2; | |
d82b3862 | 1098 | fprintfi_filtered (indent, stream, |
bb2ec1b3 TT |
1099 | "if ((( " GCC_INTPTR |
1100 | ") __gdb_stack[__gdb_tos--]) != 0) goto "); | |
1101 | print_label (stream, scope, op_ptr + offset - base); | |
d82b3862 | 1102 | stream->puts (";\n"); |
bb2ec1b3 TT |
1103 | break; |
1104 | ||
1105 | case DW_OP_nop: | |
1106 | break; | |
1107 | ||
1108 | default: | |
1109 | error (_("unhandled DWARF op: %s"), get_DW_OP_name (op)); | |
1110 | } | |
1111 | } | |
1112 | ||
d82b3862 | 1113 | fprintfi_filtered (indent, stream, "%s = __gdb_stack[__gdb_tos];\n", |
3a9558c4 | 1114 | result_name); |
d82b3862 | 1115 | fprintfi_filtered (indent - 2, stream, "}\n"); |
bb2ec1b3 TT |
1116 | } |
1117 | ||
1118 | /* See compile.h. */ | |
1119 | ||
1120 | void | |
d82b3862 | 1121 | compile_dwarf_expr_to_c (string_file *stream, const char *result_name, |
bb2ec1b3 TT |
1122 | struct symbol *sym, CORE_ADDR pc, |
1123 | struct gdbarch *arch, unsigned char *registers_used, | |
1124 | unsigned int addr_size, | |
1125 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
1126 | struct dwarf2_per_cu_data *per_cu) | |
1127 | { | |
3a9558c4 | 1128 | do_compile_dwarf_expr_to_c (2, stream, GCC_UINTPTR, result_name, sym, pc, |
bb2ec1b3 TT |
1129 | arch, registers_used, addr_size, op_ptr, op_end, |
1130 | NULL, per_cu); | |
1131 | } | |
1132 | ||
1133 | /* See compile.h. */ | |
1134 | ||
1135 | void | |
d82b3862 | 1136 | compile_dwarf_bounds_to_c (string_file *stream, |
bb2ec1b3 TT |
1137 | const char *result_name, |
1138 | const struct dynamic_prop *prop, | |
1139 | struct symbol *sym, CORE_ADDR pc, | |
1140 | struct gdbarch *arch, unsigned char *registers_used, | |
1141 | unsigned int addr_size, | |
1142 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
1143 | struct dwarf2_per_cu_data *per_cu) | |
1144 | { | |
1145 | do_compile_dwarf_expr_to_c (2, stream, "unsigned long ", result_name, | |
1146 | sym, pc, arch, registers_used, | |
1147 | addr_size, op_ptr, op_end, NULL, per_cu); | |
1148 | } |