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c906108c | 1 | /* Functions for manipulating expressions designed to be executed on the agent |
213516ef | 2 | Copyright (C) 1998-2023 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 9 | (at your option) any later version. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b | 16 | You should have received a copy of the GNU General Public License |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 18 | |
c906108c SS |
19 | /* Despite what the above comment says about this file being part of |
20 | GDB, we would like to keep these functions free of GDB | |
21 | dependencies, since we want to be able to use them in contexts | |
22 | outside of GDB (test suites, the stub, etc.) */ | |
23 | ||
24 | #include "defs.h" | |
d55e5aa6 | 25 | #include "ax.h" |
0d12e84c | 26 | #include "gdbarch.h" |
4de283e4 | 27 | |
d55e5aa6 | 28 | #include "value.h" |
4de283e4 | 29 | #include "user-regs.h" |
175ff332 | 30 | |
a14ed312 | 31 | static void append_const (struct agent_expr *x, LONGEST val, int n); |
392a587b | 32 | |
a14ed312 | 33 | static LONGEST read_const (struct agent_expr *x, int o, int n); |
392a587b | 34 | |
a14ed312 | 35 | static void generic_ext (struct agent_expr *x, enum agent_op op, int n); |
c906108c SS |
36 | \f |
37 | /* Functions for building expressions. */ | |
38 | ||
c906108c SS |
39 | /* Append the low N bytes of VAL as an N-byte integer to the |
40 | expression X, in big-endian order. */ | |
41 | static void | |
fba45db2 | 42 | append_const (struct agent_expr *x, LONGEST val, int n) |
c906108c SS |
43 | { |
44 | int i; | |
45 | ||
c906108c SS |
46 | for (i = n - 1; i >= 0; i--) |
47 | { | |
6f96f485 | 48 | x->buf.push_back (val & 0xff); |
c906108c SS |
49 | val >>= 8; |
50 | } | |
c906108c SS |
51 | } |
52 | ||
53 | ||
54 | /* Extract an N-byte big-endian unsigned integer from expression X at | |
55 | offset O. */ | |
56 | static LONGEST | |
fba45db2 | 57 | read_const (struct agent_expr *x, int o, int n) |
c906108c SS |
58 | { |
59 | int i; | |
60 | LONGEST accum = 0; | |
61 | ||
62 | /* Make sure we're not reading off the end of the expression. */ | |
6f96f485 | 63 | if (o + n > x->buf.size ()) |
3d263c1d | 64 | error (_("GDB bug: ax-general.c (read_const): incomplete constant")); |
c906108c SS |
65 | |
66 | for (i = 0; i < n; i++) | |
67 | accum = (accum << 8) | x->buf[o + i]; | |
c5aa993b | 68 | |
c906108c SS |
69 | return accum; |
70 | } | |
71 | ||
70b8286a SM |
72 | /* See ax.h. */ |
73 | ||
74 | void | |
75 | ax_raw_byte (struct agent_expr *x, gdb_byte byte) | |
76 | { | |
6f96f485 | 77 | x->buf.push_back (byte); |
70b8286a | 78 | } |
c906108c SS |
79 | |
80 | /* Append a simple operator OP to EXPR. */ | |
81 | void | |
fba45db2 | 82 | ax_simple (struct agent_expr *x, enum agent_op op) |
c906108c | 83 | { |
70b8286a | 84 | ax_raw_byte (x, op); |
c906108c SS |
85 | } |
86 | ||
c7f96d2b TT |
87 | /* Append a pick operator to EXPR. DEPTH is the stack item to pick, |
88 | with 0 being top of stack. */ | |
2b52013f | 89 | |
c7f96d2b TT |
90 | void |
91 | ax_pick (struct agent_expr *x, int depth) | |
92 | { | |
93 | if (depth < 0 || depth > 255) | |
94 | error (_("GDB bug: ax-general.c (ax_pick): stack depth out of range")); | |
95 | ax_simple (x, aop_pick); | |
96 | append_const (x, 1, depth); | |
97 | } | |
98 | ||
c906108c SS |
99 | |
100 | /* Append a sign-extension or zero-extension instruction to EXPR, to | |
101 | extend an N-bit value. */ | |
102 | static void | |
fba45db2 | 103 | generic_ext (struct agent_expr *x, enum agent_op op, int n) |
c906108c SS |
104 | { |
105 | /* N must fit in a byte. */ | |
106 | if (n < 0 || n > 255) | |
3d263c1d | 107 | error (_("GDB bug: ax-general.c (generic_ext): bit count out of range")); |
c906108c SS |
108 | /* That had better be enough range. */ |
109 | if (sizeof (LONGEST) * 8 > 255) | |
3e43a32a MS |
110 | error (_("GDB bug: ax-general.c (generic_ext): " |
111 | "opcode has inadequate range")); | |
c906108c | 112 | |
6f96f485 TT |
113 | x->buf.push_back (op); |
114 | x->buf.push_back (n); | |
c906108c SS |
115 | } |
116 | ||
117 | ||
118 | /* Append a sign-extension instruction to EXPR, to extend an N-bit value. */ | |
119 | void | |
fba45db2 | 120 | ax_ext (struct agent_expr *x, int n) |
c906108c SS |
121 | { |
122 | generic_ext (x, aop_ext, n); | |
123 | } | |
124 | ||
125 | ||
126 | /* Append a zero-extension instruction to EXPR, to extend an N-bit value. */ | |
127 | void | |
fba45db2 | 128 | ax_zero_ext (struct agent_expr *x, int n) |
c906108c SS |
129 | { |
130 | generic_ext (x, aop_zero_ext, n); | |
131 | } | |
132 | ||
133 | ||
134 | /* Append a trace_quick instruction to EXPR, to record N bytes. */ | |
135 | void | |
fba45db2 | 136 | ax_trace_quick (struct agent_expr *x, int n) |
c906108c SS |
137 | { |
138 | /* N must fit in a byte. */ | |
139 | if (n < 0 || n > 255) | |
3e43a32a MS |
140 | error (_("GDB bug: ax-general.c (ax_trace_quick): " |
141 | "size out of range for trace_quick")); | |
c906108c | 142 | |
6f96f485 TT |
143 | x->buf.push_back (aop_trace_quick); |
144 | x->buf.push_back (n); | |
c906108c SS |
145 | } |
146 | ||
147 | ||
148 | /* Append a goto op to EXPR. OP is the actual op (must be aop_goto or | |
149 | aop_if_goto). We assume we don't know the target offset yet, | |
150 | because it's probably a forward branch, so we leave space in EXPR | |
151 | for the target, and return the offset in EXPR of that space, so we | |
152 | can backpatch it once we do know the target offset. Use ax_label | |
153 | to do the backpatching. */ | |
c5aa993b | 154 | int |
fba45db2 | 155 | ax_goto (struct agent_expr *x, enum agent_op op) |
c906108c | 156 | { |
6f96f485 TT |
157 | x->buf.push_back (op); |
158 | x->buf.push_back (0xff); | |
159 | x->buf.push_back (0xff); | |
160 | return x->buf.size () - 2; | |
c906108c SS |
161 | } |
162 | ||
163 | /* Suppose a given call to ax_goto returns some value PATCH. When you | |
164 | know the offset TARGET that goto should jump to, call | |
c5aa993b | 165 | ax_label (EXPR, PATCH, TARGET) |
c906108c SS |
166 | to patch TARGET into the ax_goto instruction. */ |
167 | void | |
fba45db2 | 168 | ax_label (struct agent_expr *x, int patch, int target) |
c906108c SS |
169 | { |
170 | /* Make sure the value is in range. Don't accept 0xffff as an | |
171 | offset; that's our magic sentinel value for unpatched branches. */ | |
172 | if (target < 0 || target >= 0xffff) | |
3d263c1d | 173 | error (_("GDB bug: ax-general.c (ax_label): label target out of range")); |
c5aa993b | 174 | |
c906108c SS |
175 | x->buf[patch] = (target >> 8) & 0xff; |
176 | x->buf[patch + 1] = target & 0xff; | |
177 | } | |
178 | ||
179 | ||
180 | /* Assemble code to push a constant on the stack. */ | |
181 | void | |
fba45db2 | 182 | ax_const_l (struct agent_expr *x, LONGEST l) |
c906108c SS |
183 | { |
184 | static enum agent_op ops[] | |
c5aa993b JM |
185 | = |
186 | {aop_const8, aop_const16, aop_const32, aop_const64}; | |
c906108c SS |
187 | int size; |
188 | int op; | |
189 | ||
190 | /* How big is the number? 'op' keeps track of which opcode to use. | |
191 | Notice that we don't really care whether the original number was | |
192 | signed or unsigned; we always reproduce the value exactly, and | |
193 | use the shortest representation. */ | |
194 | for (op = 0, size = 8; size < 64; size *= 2, op++) | |
44a81774 | 195 | { |
cf3e25ca | 196 | LONGEST lim = ((LONGEST) 1) << (size - 1); |
44a81774 JB |
197 | |
198 | if (-lim <= l && l <= lim - 1) | |
dda83cd7 | 199 | break; |
44a81774 | 200 | } |
c906108c | 201 | |
0e2de366 | 202 | /* Emit the right opcode... */ |
c906108c SS |
203 | ax_simple (x, ops[op]); |
204 | ||
205 | /* Emit the low SIZE bytes as an unsigned number. We know that | |
206 | sign-extending this will yield l. */ | |
207 | append_const (x, l, size / 8); | |
208 | ||
209 | /* Now, if it was negative, and not full-sized, sign-extend it. */ | |
210 | if (l < 0 && size < 64) | |
211 | ax_ext (x, size); | |
212 | } | |
213 | ||
214 | ||
215 | void | |
fba45db2 | 216 | ax_const_d (struct agent_expr *x, LONGEST d) |
c906108c SS |
217 | { |
218 | /* FIXME: floating-point support not present yet. */ | |
3e43a32a MS |
219 | error (_("GDB bug: ax-general.c (ax_const_d): " |
220 | "floating point not supported yet")); | |
c906108c SS |
221 | } |
222 | ||
223 | ||
224 | /* Assemble code to push the value of register number REG on the | |
225 | stack. */ | |
c5aa993b | 226 | void |
fba45db2 | 227 | ax_reg (struct agent_expr *x, int reg) |
c906108c | 228 | { |
175ff332 HZ |
229 | if (reg >= gdbarch_num_regs (x->gdbarch)) |
230 | { | |
231 | /* This is a pseudo-register. */ | |
232 | if (!gdbarch_ax_pseudo_register_push_stack_p (x->gdbarch)) | |
233 | error (_("'%s' is a pseudo-register; " | |
234 | "GDB cannot yet trace its contents."), | |
235 | user_reg_map_regnum_to_name (x->gdbarch, reg)); | |
236 | if (gdbarch_ax_pseudo_register_push_stack (x->gdbarch, x, reg)) | |
237 | error (_("Trace '%s' failed."), | |
238 | user_reg_map_regnum_to_name (x->gdbarch, reg)); | |
239 | } | |
240 | else | |
241 | { | |
1eb7c2d8 AT |
242 | /* Get the remote register number. */ |
243 | reg = gdbarch_remote_register_number (x->gdbarch, reg); | |
244 | ||
175ff332 HZ |
245 | /* Make sure the register number is in range. */ |
246 | if (reg < 0 || reg > 0xffff) | |
dda83cd7 | 247 | error (_("GDB bug: ax-general.c (ax_reg): " |
3e43a32a | 248 | "register number out of range")); |
6f96f485 TT |
249 | x->buf.push_back (aop_reg); |
250 | x->buf.push_back ((reg >> 8) & 0xff); | |
251 | x->buf.push_back ((reg) & 0xff); | |
175ff332 | 252 | } |
c906108c | 253 | } |
f61e138d SS |
254 | |
255 | /* Assemble code to operate on a trace state variable. */ | |
256 | ||
257 | void | |
258 | ax_tsv (struct agent_expr *x, enum agent_op op, int num) | |
259 | { | |
260 | /* Make sure the tsv number is in range. */ | |
261 | if (num < 0 || num > 0xffff) | |
f34652de | 262 | internal_error (_("ax-general.c (ax_tsv): variable " |
3e43a32a | 263 | "number is %d, out of range"), num); |
f61e138d | 264 | |
6f96f485 TT |
265 | x->buf.push_back (op); |
266 | x->buf.push_back ((num >> 8) & 0xff); | |
267 | x->buf.push_back ((num) & 0xff); | |
f61e138d | 268 | } |
d3ce09f5 SS |
269 | |
270 | /* Append a string to the expression. Note that the string is going | |
271 | into the bytecodes directly, not on the stack. As a precaution, | |
272 | include both length as prefix, and terminate with a NUL. (The NUL | |
273 | is counted in the length.) */ | |
274 | ||
275 | void | |
741d92cf | 276 | ax_string (struct agent_expr *x, const char *str, int slen) |
d3ce09f5 SS |
277 | { |
278 | int i; | |
279 | ||
280 | /* Make sure the string length is reasonable. */ | |
281 | if (slen < 0 || slen > 0xffff) | |
f34652de | 282 | internal_error (_("ax-general.c (ax_string): string " |
d3ce09f5 SS |
283 | "length is %d, out of allowed range"), slen); |
284 | ||
6f96f485 TT |
285 | x->buf.push_back (((slen + 1) >> 8) & 0xff); |
286 | x->buf.push_back ((slen + 1) & 0xff); | |
d3ce09f5 | 287 | for (i = 0; i < slen; ++i) |
6f96f485 TT |
288 | x->buf.push_back (str[i]); |
289 | x->buf.push_back ('\0'); | |
d3ce09f5 | 290 | } |
c5aa993b | 291 | \f |
c906108c SS |
292 | |
293 | ||
c906108c SS |
294 | /* Functions for disassembling agent expressions, and otherwise |
295 | debugging the expression compiler. */ | |
296 | ||
1e0e3ecd TT |
297 | /* An entry in the opcode map. */ |
298 | struct aop_map | |
299 | { | |
300 | ||
301 | /* The name of the opcode. Null means that this entry is not a | |
302 | valid opcode --- a hole in the opcode space. */ | |
303 | const char *name; | |
304 | ||
305 | /* All opcodes take no operands from the bytecode stream, or take | |
306 | unsigned integers of various sizes. If this is a positive number | |
307 | n, then the opcode is followed by an n-byte operand, which should | |
308 | be printed as an unsigned integer. If this is zero, then the | |
309 | opcode takes no operands from the bytecode stream. | |
310 | ||
311 | If we get more complicated opcodes in the future, don't add other | |
312 | magic values of this; that's a crock. Add an `enum encoding' | |
313 | field to this, or something like that. */ | |
314 | int op_size; | |
315 | ||
316 | /* The size of the data operated upon, in bits, for bytecodes that | |
317 | care about that (ref and const). Zero for all others. */ | |
318 | int data_size; | |
319 | ||
320 | /* Number of stack elements consumed, and number produced. */ | |
321 | int consumed, produced; | |
322 | }; | |
323 | ||
324 | /* Map of the bytecodes, indexed by bytecode number. */ | |
325 | ||
326 | static struct aop_map aop_map[] = | |
c5aa993b | 327 | { |
94d5e490 TT |
328 | {0, 0, 0, 0, 0} |
329 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) \ | |
330 | , { # NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED } | |
268a13a5 | 331 | #include "gdbsupport/ax.def" |
94d5e490 | 332 | #undef DEFOP |
c906108c SS |
333 | }; |
334 | ||
335 | ||
336 | /* Disassemble the expression EXPR, writing to F. */ | |
337 | void | |
fba45db2 | 338 | ax_print (struct ui_file *f, struct agent_expr *x) |
c906108c SS |
339 | { |
340 | int i; | |
c906108c | 341 | |
6cb06a8c TT |
342 | gdb_printf (f, _("Scope: %s\n"), paddress (x->gdbarch, x->scope)); |
343 | gdb_printf (f, _("Reg mask:")); | |
a2bbca9f TT |
344 | for (i = 0; i < x->reg_mask.size (); ++i) |
345 | { | |
346 | if ((i % 8) == 0) | |
347 | gdb_printf (f, " "); | |
348 | gdb_printf (f, _("%d"), (int) x->reg_mask[i]); | |
349 | } | |
6cb06a8c | 350 | gdb_printf (f, _("\n")); |
35c9c7ba | 351 | |
c906108c SS |
352 | /* Check the size of the name array against the number of entries in |
353 | the enum, to catch additions that people didn't sync. */ | |
354 | if ((sizeof (aop_map) / sizeof (aop_map[0])) | |
355 | != aop_last) | |
3d263c1d | 356 | error (_("GDB bug: ax-general.c (ax_print): opcode map out of sync")); |
c5aa993b | 357 | |
6f96f485 | 358 | for (i = 0; i < x->buf.size ();) |
c906108c | 359 | { |
aead7601 | 360 | enum agent_op op = (enum agent_op) x->buf[i]; |
c906108c SS |
361 | |
362 | if (op >= (sizeof (aop_map) / sizeof (aop_map[0])) | |
c5aa993b | 363 | || !aop_map[op].name) |
c906108c | 364 | { |
6cb06a8c | 365 | gdb_printf (f, _("%3d <bad opcode %02x>\n"), i, op); |
c906108c SS |
366 | i++; |
367 | continue; | |
368 | } | |
6f96f485 | 369 | if (i + 1 + aop_map[op].op_size > x->buf.size ()) |
c906108c | 370 | { |
6cb06a8c TT |
371 | gdb_printf (f, _("%3d <incomplete opcode %s>\n"), |
372 | i, aop_map[op].name); | |
c906108c SS |
373 | break; |
374 | } | |
375 | ||
6cb06a8c | 376 | gdb_printf (f, "%3d %s", i, aop_map[op].name); |
a04b0428 | 377 | if (aop_map[op].op_size > 0) |
c906108c | 378 | { |
0426ad51 | 379 | gdb_puts (" ", f); |
c5aa993b | 380 | |
c906108c | 381 | print_longest (f, 'd', 0, |
a04b0428 | 382 | read_const (x, i + 1, aop_map[op].op_size)); |
c906108c | 383 | } |
d3ce09f5 SS |
384 | /* Handle the complicated printf arguments specially. */ |
385 | else if (op == aop_printf) | |
386 | { | |
387 | int slen, nargs; | |
388 | ||
389 | i++; | |
390 | nargs = x->buf[i++]; | |
391 | slen = x->buf[i++]; | |
392 | slen = slen * 256 + x->buf[i++]; | |
6cb06a8c TT |
393 | gdb_printf (f, _(" \"%s\", %d args"), |
394 | &(x->buf[i]), nargs); | |
d3ce09f5 SS |
395 | i += slen - 1; |
396 | } | |
6cb06a8c | 397 | gdb_printf (f, "\n"); |
a04b0428 | 398 | i += 1 + aop_map[op].op_size; |
c906108c SS |
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 | { | |
1eb7c2d8 AT |
419 | /* Get the remote register number. */ |
420 | reg = gdbarch_remote_register_number (ax->gdbarch, reg); | |
175ff332 HZ |
421 | |
422 | /* Grow the bit mask if necessary. */ | |
a2bbca9f TT |
423 | if (reg >= ax->reg_mask.size ()) |
424 | ax->reg_mask.resize (reg); | |
175ff332 | 425 | |
a2bbca9f | 426 | ax->reg_mask[reg] = true; |
35c9c7ba | 427 | } |
35c9c7ba SS |
428 | } |
429 | ||
430 | /* Given an agent expression AX, fill in requirements and other descriptive | |
431 | bits. */ | |
c906108c | 432 | void |
35c9c7ba | 433 | ax_reqs (struct agent_expr *ax) |
c906108c SS |
434 | { |
435 | int i; | |
436 | int height; | |
437 | ||
3d269a59 JB |
438 | /* Jump target table. targets[i] is non-zero iff we have found a |
439 | jump to offset i. */ | |
6f96f485 | 440 | char *targets = (char *) alloca (ax->buf.size () * sizeof (targets[0])); |
c906108c | 441 | |
3d269a59 JB |
442 | /* Instruction boundary table. boundary[i] is non-zero iff our scan |
443 | has reached an instruction starting at offset i. */ | |
6f96f485 | 444 | char *boundary = (char *) alloca (ax->buf.size () * sizeof (boundary[0])); |
c906108c | 445 | |
3d269a59 | 446 | /* Stack height record. If either targets[i] or boundary[i] is |
c906108c SS |
447 | non-zero, heights[i] is the height the stack should have before |
448 | executing the bytecode at that point. */ | |
6f96f485 | 449 | int *heights = (int *) alloca (ax->buf.size () * sizeof (heights[0])); |
c906108c SS |
450 | |
451 | /* Pointer to a description of the present op. */ | |
452 | struct aop_map *op; | |
453 | ||
6f96f485 TT |
454 | memset (targets, 0, ax->buf.size () * sizeof (targets[0])); |
455 | memset (boundary, 0, ax->buf.size () * sizeof (boundary[0])); | |
c906108c | 456 | |
35c9c7ba SS |
457 | ax->max_height = ax->min_height = height = 0; |
458 | ax->flaw = agent_flaw_none; | |
459 | ax->max_data_size = 0; | |
c906108c | 460 | |
6f96f485 | 461 | for (i = 0; i < ax->buf.size (); i += 1 + op->op_size) |
c906108c SS |
462 | { |
463 | if (ax->buf[i] > (sizeof (aop_map) / sizeof (aop_map[0]))) | |
464 | { | |
35c9c7ba | 465 | ax->flaw = agent_flaw_bad_instruction; |
c906108c SS |
466 | return; |
467 | } | |
468 | ||
469 | op = &aop_map[ax->buf[i]]; | |
470 | ||
c5aa993b | 471 | if (!op->name) |
c906108c | 472 | { |
35c9c7ba | 473 | ax->flaw = agent_flaw_bad_instruction; |
c906108c SS |
474 | return; |
475 | } | |
c5aa993b | 476 | |
6f96f485 | 477 | if (i + 1 + op->op_size > ax->buf.size ()) |
c906108c | 478 | { |
35c9c7ba | 479 | ax->flaw = agent_flaw_incomplete_instruction; |
c906108c SS |
480 | return; |
481 | } | |
482 | ||
3d269a59 | 483 | /* If this instruction is a forward jump target, does the |
dda83cd7 SM |
484 | current stack height match the stack height at the jump |
485 | source? */ | |
c906108c SS |
486 | if (targets[i] && (heights[i] != height)) |
487 | { | |
35c9c7ba | 488 | ax->flaw = agent_flaw_height_mismatch; |
c906108c SS |
489 | return; |
490 | } | |
491 | ||
492 | boundary[i] = 1; | |
493 | heights[i] = height; | |
494 | ||
a04b0428 | 495 | height -= op->consumed; |
35c9c7ba SS |
496 | if (height < ax->min_height) |
497 | ax->min_height = height; | |
c906108c | 498 | height += op->produced; |
35c9c7ba SS |
499 | if (height > ax->max_height) |
500 | ax->max_height = height; | |
c906108c | 501 | |
35c9c7ba SS |
502 | if (op->data_size > ax->max_data_size) |
503 | ax->max_data_size = op->data_size; | |
c906108c SS |
504 | |
505 | /* For jump instructions, check that the target is a valid | |
dda83cd7 SM |
506 | offset. If it is, record the fact that that location is a |
507 | jump target, and record the height we expect there. */ | |
c906108c SS |
508 | if (aop_goto == op - aop_map |
509 | || aop_if_goto == op - aop_map) | |
510 | { | |
511 | int target = read_const (ax, i + 1, 2); | |
6f96f485 | 512 | if (target < 0 || target >= ax->buf.size ()) |
c906108c | 513 | { |
35c9c7ba | 514 | ax->flaw = agent_flaw_bad_jump; |
c906108c SS |
515 | return; |
516 | } | |
3d269a59 JB |
517 | |
518 | /* Do we have any information about what the stack height | |
dda83cd7 | 519 | should be at the target? */ |
3d269a59 | 520 | if (targets[target] || boundary[target]) |
c906108c | 521 | { |
3d269a59 | 522 | if (heights[target] != height) |
c906108c | 523 | { |
35c9c7ba | 524 | ax->flaw = agent_flaw_height_mismatch; |
c906108c SS |
525 | return; |
526 | } | |
527 | } | |
3d269a59 | 528 | |
dda83cd7 SM |
529 | /* Record the target, along with the stack height we expect. */ |
530 | targets[target] = 1; | |
531 | heights[target] = height; | |
c906108c | 532 | } |
c5aa993b | 533 | |
c906108c | 534 | /* For unconditional jumps with a successor, check that the |
dda83cd7 | 535 | successor is a target, and pick up its stack height. */ |
c906108c | 536 | if (aop_goto == op - aop_map |
6f96f485 | 537 | && i + 3 < ax->buf.size ()) |
c906108c | 538 | { |
c5aa993b | 539 | if (!targets[i + 3]) |
c906108c | 540 | { |
35c9c7ba | 541 | ax->flaw = agent_flaw_hole; |
c906108c SS |
542 | return; |
543 | } | |
544 | ||
545 | height = heights[i + 3]; | |
546 | } | |
547 | ||
548 | /* For reg instructions, record the register in the bit mask. */ | |
549 | if (aop_reg == op - aop_map) | |
550 | { | |
551 | int reg = read_const (ax, i + 1, 2); | |
c906108c | 552 | |
35c9c7ba | 553 | ax_reg_mask (ax, reg); |
c906108c SS |
554 | } |
555 | } | |
556 | ||
557 | /* Check that all the targets are on boundaries. */ | |
6f96f485 | 558 | for (i = 0; i < ax->buf.size (); i++) |
c906108c SS |
559 | if (targets[i] && !boundary[i]) |
560 | { | |
35c9c7ba | 561 | ax->flaw = agent_flaw_bad_jump; |
c906108c SS |
562 | return; |
563 | } | |
564 | ||
35c9c7ba | 565 | ax->final_height = height; |
c906108c | 566 | } |