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c906108c | 1 | /* Functions for manipulating expressions designed to be executed on the agent |
7b6bb8da | 2 | Copyright (C) 1998, 1999, 2000, 2007, 2008, 2009, 2010, 2011 |
0fb0cc75 | 3 | Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 19 | |
c906108c SS |
20 | /* Despite what the above comment says about this file being part of |
21 | GDB, we would like to keep these functions free of GDB | |
22 | dependencies, since we want to be able to use them in contexts | |
23 | outside of GDB (test suites, the stub, etc.) */ | |
24 | ||
25 | #include "defs.h" | |
26 | #include "ax.h" | |
27 | ||
7a292a7a | 28 | #include "value.h" |
b66d6d2e | 29 | #include "gdb_string.h" |
7a292a7a | 30 | |
175ff332 HZ |
31 | #include "user-regs.h" |
32 | ||
a14ed312 | 33 | static void grow_expr (struct agent_expr *x, int n); |
392a587b | 34 | |
a14ed312 | 35 | static void append_const (struct agent_expr *x, LONGEST val, int n); |
392a587b | 36 | |
a14ed312 | 37 | static LONGEST read_const (struct agent_expr *x, int o, int n); |
392a587b | 38 | |
a14ed312 | 39 | static void generic_ext (struct agent_expr *x, enum agent_op op, int n); |
c906108c SS |
40 | \f |
41 | /* Functions for building expressions. */ | |
42 | ||
43 | /* Allocate a new, empty agent expression. */ | |
44 | struct agent_expr * | |
35c9c7ba | 45 | new_agent_expr (struct gdbarch *gdbarch, CORE_ADDR scope) |
c906108c SS |
46 | { |
47 | struct agent_expr *x = xmalloc (sizeof (*x)); | |
35c9c7ba | 48 | |
c5aa993b | 49 | x->len = 0; |
c906108c SS |
50 | x->size = 1; /* Change this to a larger value once |
51 | reallocation code is tested. */ | |
c5aa993b | 52 | x->buf = xmalloc (x->size); |
35c9c7ba SS |
53 | |
54 | x->gdbarch = gdbarch; | |
c906108c SS |
55 | x->scope = scope; |
56 | ||
35c9c7ba SS |
57 | /* Bit vector for registers used. */ |
58 | x->reg_mask_len = 1; | |
59 | x->reg_mask = xmalloc (x->reg_mask_len * sizeof (x->reg_mask[0])); | |
60 | memset (x->reg_mask, 0, x->reg_mask_len * sizeof (x->reg_mask[0])); | |
61 | ||
c906108c SS |
62 | return x; |
63 | } | |
64 | ||
65 | /* Free a agent expression. */ | |
66 | void | |
fba45db2 | 67 | free_agent_expr (struct agent_expr *x) |
c906108c | 68 | { |
b8c9b27d | 69 | xfree (x->buf); |
35c9c7ba | 70 | xfree (x->reg_mask); |
b8c9b27d | 71 | xfree (x); |
c906108c SS |
72 | } |
73 | ||
f23d52e0 AC |
74 | static void |
75 | do_free_agent_expr_cleanup (void *x) | |
76 | { | |
77 | free_agent_expr (x); | |
78 | } | |
79 | ||
80 | struct cleanup * | |
81 | make_cleanup_free_agent_expr (struct agent_expr *x) | |
82 | { | |
83 | return make_cleanup (do_free_agent_expr_cleanup, x); | |
84 | } | |
85 | ||
c906108c SS |
86 | |
87 | /* Make sure that X has room for at least N more bytes. This doesn't | |
88 | affect the length, just the allocated size. */ | |
89 | static void | |
fba45db2 | 90 | grow_expr (struct agent_expr *x, int n) |
c906108c SS |
91 | { |
92 | if (x->len + n > x->size) | |
93 | { | |
94 | x->size *= 2; | |
95 | if (x->size < x->len + n) | |
96 | x->size = x->len + n + 10; | |
97 | x->buf = xrealloc (x->buf, x->size); | |
98 | } | |
99 | } | |
100 | ||
101 | ||
102 | /* Append the low N bytes of VAL as an N-byte integer to the | |
103 | expression X, in big-endian order. */ | |
104 | static void | |
fba45db2 | 105 | append_const (struct agent_expr *x, LONGEST val, int n) |
c906108c SS |
106 | { |
107 | int i; | |
108 | ||
109 | grow_expr (x, n); | |
110 | for (i = n - 1; i >= 0; i--) | |
111 | { | |
112 | x->buf[x->len + i] = val & 0xff; | |
113 | val >>= 8; | |
114 | } | |
115 | x->len += n; | |
116 | } | |
117 | ||
118 | ||
119 | /* Extract an N-byte big-endian unsigned integer from expression X at | |
120 | offset O. */ | |
121 | static LONGEST | |
fba45db2 | 122 | read_const (struct agent_expr *x, int o, int n) |
c906108c SS |
123 | { |
124 | int i; | |
125 | LONGEST accum = 0; | |
126 | ||
127 | /* Make sure we're not reading off the end of the expression. */ | |
128 | if (o + n > x->len) | |
3d263c1d | 129 | error (_("GDB bug: ax-general.c (read_const): incomplete constant")); |
c906108c SS |
130 | |
131 | for (i = 0; i < n; i++) | |
132 | accum = (accum << 8) | x->buf[o + i]; | |
c5aa993b | 133 | |
c906108c SS |
134 | return accum; |
135 | } | |
136 | ||
137 | ||
138 | /* Append a simple operator OP to EXPR. */ | |
139 | void | |
fba45db2 | 140 | ax_simple (struct agent_expr *x, enum agent_op op) |
c906108c SS |
141 | { |
142 | grow_expr (x, 1); | |
143 | x->buf[x->len++] = op; | |
144 | } | |
145 | ||
c7f96d2b TT |
146 | /* Append a pick operator to EXPR. DEPTH is the stack item to pick, |
147 | with 0 being top of stack. */ | |
2b52013f | 148 | |
c7f96d2b TT |
149 | void |
150 | ax_pick (struct agent_expr *x, int depth) | |
151 | { | |
152 | if (depth < 0 || depth > 255) | |
153 | error (_("GDB bug: ax-general.c (ax_pick): stack depth out of range")); | |
154 | ax_simple (x, aop_pick); | |
155 | append_const (x, 1, depth); | |
156 | } | |
157 | ||
c906108c SS |
158 | |
159 | /* Append a sign-extension or zero-extension instruction to EXPR, to | |
160 | extend an N-bit value. */ | |
161 | static void | |
fba45db2 | 162 | generic_ext (struct agent_expr *x, enum agent_op op, int n) |
c906108c SS |
163 | { |
164 | /* N must fit in a byte. */ | |
165 | if (n < 0 || n > 255) | |
3d263c1d | 166 | error (_("GDB bug: ax-general.c (generic_ext): bit count out of range")); |
c906108c SS |
167 | /* That had better be enough range. */ |
168 | if (sizeof (LONGEST) * 8 > 255) | |
3e43a32a MS |
169 | error (_("GDB bug: ax-general.c (generic_ext): " |
170 | "opcode has inadequate range")); | |
c906108c SS |
171 | |
172 | grow_expr (x, 2); | |
173 | x->buf[x->len++] = op; | |
174 | x->buf[x->len++] = n; | |
175 | } | |
176 | ||
177 | ||
178 | /* Append a sign-extension instruction to EXPR, to extend an N-bit value. */ | |
179 | void | |
fba45db2 | 180 | ax_ext (struct agent_expr *x, int n) |
c906108c SS |
181 | { |
182 | generic_ext (x, aop_ext, n); | |
183 | } | |
184 | ||
185 | ||
186 | /* Append a zero-extension instruction to EXPR, to extend an N-bit value. */ | |
187 | void | |
fba45db2 | 188 | ax_zero_ext (struct agent_expr *x, int n) |
c906108c SS |
189 | { |
190 | generic_ext (x, aop_zero_ext, n); | |
191 | } | |
192 | ||
193 | ||
194 | /* Append a trace_quick instruction to EXPR, to record N bytes. */ | |
195 | void | |
fba45db2 | 196 | ax_trace_quick (struct agent_expr *x, int n) |
c906108c SS |
197 | { |
198 | /* N must fit in a byte. */ | |
199 | if (n < 0 || n > 255) | |
3e43a32a MS |
200 | error (_("GDB bug: ax-general.c (ax_trace_quick): " |
201 | "size out of range for trace_quick")); | |
c906108c SS |
202 | |
203 | grow_expr (x, 2); | |
204 | x->buf[x->len++] = aop_trace_quick; | |
205 | x->buf[x->len++] = n; | |
206 | } | |
207 | ||
208 | ||
209 | /* Append a goto op to EXPR. OP is the actual op (must be aop_goto or | |
210 | aop_if_goto). We assume we don't know the target offset yet, | |
211 | because it's probably a forward branch, so we leave space in EXPR | |
212 | for the target, and return the offset in EXPR of that space, so we | |
213 | can backpatch it once we do know the target offset. Use ax_label | |
214 | to do the backpatching. */ | |
c5aa993b | 215 | int |
fba45db2 | 216 | ax_goto (struct agent_expr *x, enum agent_op op) |
c906108c SS |
217 | { |
218 | grow_expr (x, 3); | |
219 | x->buf[x->len + 0] = op; | |
220 | x->buf[x->len + 1] = 0xff; | |
221 | x->buf[x->len + 2] = 0xff; | |
222 | x->len += 3; | |
223 | return x->len - 2; | |
224 | } | |
225 | ||
226 | /* Suppose a given call to ax_goto returns some value PATCH. When you | |
227 | know the offset TARGET that goto should jump to, call | |
c5aa993b | 228 | ax_label (EXPR, PATCH, TARGET) |
c906108c SS |
229 | to patch TARGET into the ax_goto instruction. */ |
230 | void | |
fba45db2 | 231 | ax_label (struct agent_expr *x, int patch, int target) |
c906108c SS |
232 | { |
233 | /* Make sure the value is in range. Don't accept 0xffff as an | |
234 | offset; that's our magic sentinel value for unpatched branches. */ | |
235 | if (target < 0 || target >= 0xffff) | |
3d263c1d | 236 | error (_("GDB bug: ax-general.c (ax_label): label target out of range")); |
c5aa993b | 237 | |
c906108c SS |
238 | x->buf[patch] = (target >> 8) & 0xff; |
239 | x->buf[patch + 1] = target & 0xff; | |
240 | } | |
241 | ||
242 | ||
243 | /* Assemble code to push a constant on the stack. */ | |
244 | void | |
fba45db2 | 245 | ax_const_l (struct agent_expr *x, LONGEST l) |
c906108c SS |
246 | { |
247 | static enum agent_op ops[] | |
c5aa993b JM |
248 | = |
249 | {aop_const8, aop_const16, aop_const32, aop_const64}; | |
c906108c SS |
250 | int size; |
251 | int op; | |
252 | ||
253 | /* How big is the number? 'op' keeps track of which opcode to use. | |
254 | Notice that we don't really care whether the original number was | |
255 | signed or unsigned; we always reproduce the value exactly, and | |
256 | use the shortest representation. */ | |
257 | for (op = 0, size = 8; size < 64; size *= 2, op++) | |
44a81774 | 258 | { |
cf3e25ca | 259 | LONGEST lim = ((LONGEST) 1) << (size - 1); |
44a81774 JB |
260 | |
261 | if (-lim <= l && l <= lim - 1) | |
262 | break; | |
263 | } | |
c906108c | 264 | |
0e2de366 | 265 | /* Emit the right opcode... */ |
c906108c SS |
266 | ax_simple (x, ops[op]); |
267 | ||
268 | /* Emit the low SIZE bytes as an unsigned number. We know that | |
269 | sign-extending this will yield l. */ | |
270 | append_const (x, l, size / 8); | |
271 | ||
272 | /* Now, if it was negative, and not full-sized, sign-extend it. */ | |
273 | if (l < 0 && size < 64) | |
274 | ax_ext (x, size); | |
275 | } | |
276 | ||
277 | ||
278 | void | |
fba45db2 | 279 | ax_const_d (struct agent_expr *x, LONGEST d) |
c906108c SS |
280 | { |
281 | /* FIXME: floating-point support not present yet. */ | |
3e43a32a MS |
282 | error (_("GDB bug: ax-general.c (ax_const_d): " |
283 | "floating point not supported yet")); | |
c906108c SS |
284 | } |
285 | ||
286 | ||
287 | /* Assemble code to push the value of register number REG on the | |
288 | stack. */ | |
c5aa993b | 289 | void |
fba45db2 | 290 | ax_reg (struct agent_expr *x, int reg) |
c906108c | 291 | { |
175ff332 HZ |
292 | if (reg >= gdbarch_num_regs (x->gdbarch)) |
293 | { | |
294 | /* This is a pseudo-register. */ | |
295 | if (!gdbarch_ax_pseudo_register_push_stack_p (x->gdbarch)) | |
296 | error (_("'%s' is a pseudo-register; " | |
297 | "GDB cannot yet trace its contents."), | |
298 | user_reg_map_regnum_to_name (x->gdbarch, reg)); | |
299 | if (gdbarch_ax_pseudo_register_push_stack (x->gdbarch, x, reg)) | |
300 | error (_("Trace '%s' failed."), | |
301 | user_reg_map_regnum_to_name (x->gdbarch, reg)); | |
302 | } | |
303 | else | |
304 | { | |
305 | /* Make sure the register number is in range. */ | |
306 | if (reg < 0 || reg > 0xffff) | |
3e43a32a MS |
307 | error (_("GDB bug: ax-general.c (ax_reg): " |
308 | "register number out of range")); | |
175ff332 HZ |
309 | grow_expr (x, 3); |
310 | x->buf[x->len] = aop_reg; | |
311 | x->buf[x->len + 1] = (reg >> 8) & 0xff; | |
312 | x->buf[x->len + 2] = (reg) & 0xff; | |
313 | x->len += 3; | |
314 | } | |
c906108c | 315 | } |
f61e138d SS |
316 | |
317 | /* Assemble code to operate on a trace state variable. */ | |
318 | ||
319 | void | |
320 | ax_tsv (struct agent_expr *x, enum agent_op op, int num) | |
321 | { | |
322 | /* Make sure the tsv number is in range. */ | |
323 | if (num < 0 || num > 0xffff) | |
3e43a32a MS |
324 | internal_error (__FILE__, __LINE__, |
325 | _("ax-general.c (ax_tsv): variable " | |
326 | "number is %d, out of range"), num); | |
f61e138d SS |
327 | |
328 | grow_expr (x, 3); | |
329 | x->buf[x->len] = op; | |
330 | x->buf[x->len + 1] = (num >> 8) & 0xff; | |
331 | x->buf[x->len + 2] = (num) & 0xff; | |
332 | x->len += 3; | |
333 | } | |
c5aa993b | 334 | \f |
c906108c SS |
335 | |
336 | ||
c906108c SS |
337 | /* Functions for disassembling agent expressions, and otherwise |
338 | debugging the expression compiler. */ | |
339 | ||
c5aa993b JM |
340 | struct aop_map aop_map[] = |
341 | { | |
94d5e490 TT |
342 | {0, 0, 0, 0, 0} |
343 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) \ | |
344 | , { # NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED } | |
345 | #include "ax.def" | |
346 | #undef DEFOP | |
c906108c SS |
347 | }; |
348 | ||
349 | ||
350 | /* Disassemble the expression EXPR, writing to F. */ | |
351 | void | |
fba45db2 | 352 | ax_print (struct ui_file *f, struct agent_expr *x) |
c906108c SS |
353 | { |
354 | int i; | |
355 | int is_float = 0; | |
356 | ||
35c9c7ba SS |
357 | fprintf_filtered (f, _("Scope: %s\n"), paddress (x->gdbarch, x->scope)); |
358 | fprintf_filtered (f, _("Reg mask:")); | |
359 | for (i = 0; i < x->reg_mask_len; ++i) | |
360 | fprintf_filtered (f, _(" %02x"), x->reg_mask[i]); | |
361 | fprintf_filtered (f, _("\n")); | |
362 | ||
c906108c SS |
363 | /* Check the size of the name array against the number of entries in |
364 | the enum, to catch additions that people didn't sync. */ | |
365 | if ((sizeof (aop_map) / sizeof (aop_map[0])) | |
366 | != aop_last) | |
3d263c1d | 367 | error (_("GDB bug: ax-general.c (ax_print): opcode map out of sync")); |
c5aa993b JM |
368 | |
369 | for (i = 0; i < x->len;) | |
c906108c SS |
370 | { |
371 | enum agent_op op = x->buf[i]; | |
372 | ||
373 | if (op >= (sizeof (aop_map) / sizeof (aop_map[0])) | |
c5aa993b | 374 | || !aop_map[op].name) |
c906108c | 375 | { |
3d263c1d | 376 | fprintf_filtered (f, _("%3d <bad opcode %02x>\n"), i, op); |
c906108c SS |
377 | i++; |
378 | continue; | |
379 | } | |
a04b0428 | 380 | if (i + 1 + aop_map[op].op_size > x->len) |
c906108c | 381 | { |
3d263c1d | 382 | fprintf_filtered (f, _("%3d <incomplete opcode %s>\n"), |
c906108c SS |
383 | i, aop_map[op].name); |
384 | break; | |
385 | } | |
386 | ||
387 | fprintf_filtered (f, "%3d %s", i, aop_map[op].name); | |
a04b0428 | 388 | if (aop_map[op].op_size > 0) |
c906108c SS |
389 | { |
390 | fputs_filtered (" ", f); | |
c5aa993b | 391 | |
c906108c | 392 | print_longest (f, 'd', 0, |
a04b0428 | 393 | read_const (x, i + 1, aop_map[op].op_size)); |
c906108c SS |
394 | } |
395 | fprintf_filtered (f, "\n"); | |
a04b0428 | 396 | i += 1 + aop_map[op].op_size; |
c906108c SS |
397 | |
398 | is_float = (op == aop_float); | |
399 | } | |
400 | } | |
401 | ||
35c9c7ba SS |
402 | /* Add register REG to the register mask for expression AX. */ |
403 | void | |
404 | ax_reg_mask (struct agent_expr *ax, int reg) | |
405 | { | |
175ff332 | 406 | if (reg >= gdbarch_num_regs (ax->gdbarch)) |
35c9c7ba | 407 | { |
175ff332 HZ |
408 | /* This is a pseudo-register. */ |
409 | if (!gdbarch_ax_pseudo_register_collect_p (ax->gdbarch)) | |
410 | error (_("'%s' is a pseudo-register; " | |
411 | "GDB cannot yet trace its contents."), | |
412 | user_reg_map_regnum_to_name (ax->gdbarch, reg)); | |
413 | if (gdbarch_ax_pseudo_register_collect (ax->gdbarch, ax, reg)) | |
414 | error (_("Trace '%s' failed."), | |
415 | user_reg_map_regnum_to_name (ax->gdbarch, reg)); | |
416 | } | |
417 | else | |
418 | { | |
419 | int byte = reg / 8; | |
420 | ||
421 | /* Grow the bit mask if necessary. */ | |
422 | if (byte >= ax->reg_mask_len) | |
423 | { | |
424 | /* It's not appropriate to double here. This isn't a | |
425 | string buffer. */ | |
426 | int new_len = byte + 1; | |
427 | unsigned char *new_reg_mask = xrealloc (ax->reg_mask, | |
428 | new_len | |
429 | * sizeof (ax->reg_mask[0])); | |
430 | memset (new_reg_mask + ax->reg_mask_len, 0, | |
431 | (new_len - ax->reg_mask_len) * sizeof (ax->reg_mask[0])); | |
432 | ax->reg_mask_len = new_len; | |
433 | ax->reg_mask = new_reg_mask; | |
434 | } | |
435 | ||
436 | ax->reg_mask[byte] |= 1 << (reg % 8); | |
35c9c7ba | 437 | } |
35c9c7ba SS |
438 | } |
439 | ||
440 | /* Given an agent expression AX, fill in requirements and other descriptive | |
441 | bits. */ | |
c906108c | 442 | void |
35c9c7ba | 443 | ax_reqs (struct agent_expr *ax) |
c906108c SS |
444 | { |
445 | int i; | |
446 | int height; | |
447 | ||
3d269a59 JB |
448 | /* Jump target table. targets[i] is non-zero iff we have found a |
449 | jump to offset i. */ | |
c906108c SS |
450 | char *targets = (char *) alloca (ax->len * sizeof (targets[0])); |
451 | ||
3d269a59 JB |
452 | /* Instruction boundary table. boundary[i] is non-zero iff our scan |
453 | has reached an instruction starting at offset i. */ | |
c906108c SS |
454 | char *boundary = (char *) alloca (ax->len * sizeof (boundary[0])); |
455 | ||
3d269a59 | 456 | /* Stack height record. If either targets[i] or boundary[i] is |
c906108c SS |
457 | non-zero, heights[i] is the height the stack should have before |
458 | executing the bytecode at that point. */ | |
459 | int *heights = (int *) alloca (ax->len * sizeof (heights[0])); | |
460 | ||
461 | /* Pointer to a description of the present op. */ | |
462 | struct aop_map *op; | |
463 | ||
c906108c SS |
464 | memset (targets, 0, ax->len * sizeof (targets[0])); |
465 | memset (boundary, 0, ax->len * sizeof (boundary[0])); | |
466 | ||
35c9c7ba SS |
467 | ax->max_height = ax->min_height = height = 0; |
468 | ax->flaw = agent_flaw_none; | |
469 | ax->max_data_size = 0; | |
c906108c | 470 | |
a04b0428 | 471 | for (i = 0; i < ax->len; i += 1 + op->op_size) |
c906108c SS |
472 | { |
473 | if (ax->buf[i] > (sizeof (aop_map) / sizeof (aop_map[0]))) | |
474 | { | |
35c9c7ba | 475 | ax->flaw = agent_flaw_bad_instruction; |
c906108c SS |
476 | return; |
477 | } | |
478 | ||
479 | op = &aop_map[ax->buf[i]]; | |
480 | ||
c5aa993b | 481 | if (!op->name) |
c906108c | 482 | { |
35c9c7ba | 483 | ax->flaw = agent_flaw_bad_instruction; |
c906108c SS |
484 | return; |
485 | } | |
c5aa993b | 486 | |
a04b0428 | 487 | if (i + 1 + op->op_size > ax->len) |
c906108c | 488 | { |
35c9c7ba | 489 | ax->flaw = agent_flaw_incomplete_instruction; |
c906108c SS |
490 | return; |
491 | } | |
492 | ||
3d269a59 JB |
493 | /* If this instruction is a forward jump target, does the |
494 | current stack height match the stack height at the jump | |
495 | source? */ | |
c906108c SS |
496 | if (targets[i] && (heights[i] != height)) |
497 | { | |
35c9c7ba | 498 | ax->flaw = agent_flaw_height_mismatch; |
c906108c SS |
499 | return; |
500 | } | |
501 | ||
502 | boundary[i] = 1; | |
503 | heights[i] = height; | |
504 | ||
a04b0428 | 505 | height -= op->consumed; |
35c9c7ba SS |
506 | if (height < ax->min_height) |
507 | ax->min_height = height; | |
c906108c | 508 | height += op->produced; |
35c9c7ba SS |
509 | if (height > ax->max_height) |
510 | ax->max_height = height; | |
c906108c | 511 | |
35c9c7ba SS |
512 | if (op->data_size > ax->max_data_size) |
513 | ax->max_data_size = op->data_size; | |
c906108c SS |
514 | |
515 | /* For jump instructions, check that the target is a valid | |
c5aa993b JM |
516 | offset. If it is, record the fact that that location is a |
517 | jump target, and record the height we expect there. */ | |
c906108c SS |
518 | if (aop_goto == op - aop_map |
519 | || aop_if_goto == op - aop_map) | |
520 | { | |
521 | int target = read_const (ax, i + 1, 2); | |
522 | if (target < 0 || target >= ax->len) | |
523 | { | |
35c9c7ba | 524 | ax->flaw = agent_flaw_bad_jump; |
c906108c SS |
525 | return; |
526 | } | |
3d269a59 JB |
527 | |
528 | /* Do we have any information about what the stack height | |
529 | should be at the target? */ | |
530 | if (targets[target] || boundary[target]) | |
c906108c | 531 | { |
3d269a59 | 532 | if (heights[target] != height) |
c906108c | 533 | { |
35c9c7ba | 534 | ax->flaw = agent_flaw_height_mismatch; |
c906108c SS |
535 | return; |
536 | } | |
537 | } | |
3d269a59 JB |
538 | |
539 | /* Record the target, along with the stack height we expect. */ | |
540 | targets[target] = 1; | |
541 | heights[target] = height; | |
c906108c | 542 | } |
c5aa993b | 543 | |
c906108c SS |
544 | /* For unconditional jumps with a successor, check that the |
545 | successor is a target, and pick up its stack height. */ | |
546 | if (aop_goto == op - aop_map | |
547 | && i + 3 < ax->len) | |
548 | { | |
c5aa993b | 549 | if (!targets[i + 3]) |
c906108c | 550 | { |
35c9c7ba | 551 | ax->flaw = agent_flaw_hole; |
c906108c SS |
552 | return; |
553 | } | |
554 | ||
555 | height = heights[i + 3]; | |
556 | } | |
557 | ||
558 | /* For reg instructions, record the register in the bit mask. */ | |
559 | if (aop_reg == op - aop_map) | |
560 | { | |
561 | int reg = read_const (ax, i + 1, 2); | |
c906108c | 562 | |
35c9c7ba | 563 | ax_reg_mask (ax, reg); |
c906108c SS |
564 | } |
565 | } | |
566 | ||
567 | /* Check that all the targets are on boundaries. */ | |
568 | for (i = 0; i < ax->len; i++) | |
569 | if (targets[i] && !boundary[i]) | |
570 | { | |
35c9c7ba | 571 | ax->flaw = agent_flaw_bad_jump; |
c906108c SS |
572 | return; |
573 | } | |
574 | ||
35c9c7ba | 575 | ax->final_height = height; |
c906108c | 576 | } |