Mercurial > hg > CbC > CbC_gcc
comparison gcc/c-family/c-ubsan.c @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 /* UndefinedBehaviorSanitizer, undefined behavior detector. | |
2 Copyright (C) 2013-2017 Free Software Foundation, Inc. | |
3 Contributed by Marek Polacek <polacek@redhat.com> | |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #include "config.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
24 #include "tm.h" | |
25 #include "c-family/c-common.h" | |
26 #include "ubsan.h" | |
27 #include "c-family/c-ubsan.h" | |
28 #include "stor-layout.h" | |
29 #include "builtins.h" | |
30 #include "gimplify.h" | |
31 #include "stringpool.h" | |
32 #include "attribs.h" | |
33 #include "asan.h" | |
34 | |
35 /* Instrument division by zero and INT_MIN / -1. If not instrumenting, | |
36 return NULL_TREE. */ | |
37 | |
38 tree | |
39 ubsan_instrument_division (location_t loc, tree op0, tree op1) | |
40 { | |
41 tree t, tt; | |
42 tree type = TREE_TYPE (op0); | |
43 | |
44 /* At this point both operands should have the same type, | |
45 because they are already converted to RESULT_TYPE. | |
46 Use TYPE_MAIN_VARIANT since typedefs can confuse us. */ | |
47 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (op0)) | |
48 == TYPE_MAIN_VARIANT (TREE_TYPE (op1))); | |
49 | |
50 op0 = unshare_expr (op0); | |
51 op1 = unshare_expr (op1); | |
52 | |
53 if (TREE_CODE (type) == INTEGER_TYPE | |
54 && sanitize_flags_p (SANITIZE_DIVIDE)) | |
55 t = fold_build2 (EQ_EXPR, boolean_type_node, | |
56 op1, build_int_cst (type, 0)); | |
57 else if (TREE_CODE (type) == REAL_TYPE | |
58 && sanitize_flags_p (SANITIZE_FLOAT_DIVIDE)) | |
59 t = fold_build2 (EQ_EXPR, boolean_type_node, | |
60 op1, build_real (type, dconst0)); | |
61 else | |
62 return NULL_TREE; | |
63 | |
64 /* We check INT_MIN / -1 only for signed types. */ | |
65 if (TREE_CODE (type) == INTEGER_TYPE | |
66 && sanitize_flags_p (SANITIZE_DIVIDE) | |
67 && !TYPE_UNSIGNED (type)) | |
68 { | |
69 tree x; | |
70 tt = fold_build2 (EQ_EXPR, boolean_type_node, unshare_expr (op1), | |
71 build_int_cst (type, -1)); | |
72 x = fold_build2 (EQ_EXPR, boolean_type_node, op0, | |
73 TYPE_MIN_VALUE (type)); | |
74 x = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, x, tt); | |
75 t = fold_build2 (TRUTH_OR_EXPR, boolean_type_node, t, x); | |
76 } | |
77 | |
78 /* If the condition was folded to 0, no need to instrument | |
79 this expression. */ | |
80 if (integer_zerop (t)) | |
81 return NULL_TREE; | |
82 | |
83 /* In case we have a SAVE_EXPR in a conditional context, we need to | |
84 make sure it gets evaluated before the condition. */ | |
85 t = fold_build2 (COMPOUND_EXPR, TREE_TYPE (t), unshare_expr (op0), t); | |
86 t = fold_build2 (COMPOUND_EXPR, TREE_TYPE (t), unshare_expr (op1), t); | |
87 if (flag_sanitize_undefined_trap_on_error) | |
88 tt = build_call_expr_loc (loc, builtin_decl_explicit (BUILT_IN_TRAP), 0); | |
89 else | |
90 { | |
91 tree data = ubsan_create_data ("__ubsan_overflow_data", 1, &loc, | |
92 ubsan_type_descriptor (type), NULL_TREE, | |
93 NULL_TREE); | |
94 data = build_fold_addr_expr_loc (loc, data); | |
95 enum built_in_function bcode | |
96 = (flag_sanitize_recover & SANITIZE_DIVIDE) | |
97 ? BUILT_IN_UBSAN_HANDLE_DIVREM_OVERFLOW | |
98 : BUILT_IN_UBSAN_HANDLE_DIVREM_OVERFLOW_ABORT; | |
99 tt = builtin_decl_explicit (bcode); | |
100 op0 = unshare_expr (op0); | |
101 op1 = unshare_expr (op1); | |
102 tt = build_call_expr_loc (loc, tt, 3, data, ubsan_encode_value (op0), | |
103 ubsan_encode_value (op1)); | |
104 } | |
105 t = fold_build3 (COND_EXPR, void_type_node, t, tt, void_node); | |
106 | |
107 return t; | |
108 } | |
109 | |
110 /* Instrument left and right shifts. */ | |
111 | |
112 tree | |
113 ubsan_instrument_shift (location_t loc, enum tree_code code, | |
114 tree op0, tree op1) | |
115 { | |
116 tree t, tt = NULL_TREE; | |
117 tree type0 = TREE_TYPE (op0); | |
118 tree type1 = TREE_TYPE (op1); | |
119 if (!INTEGRAL_TYPE_P (type0)) | |
120 return NULL_TREE; | |
121 | |
122 tree op1_utype = unsigned_type_for (type1); | |
123 HOST_WIDE_INT op0_prec = TYPE_PRECISION (type0); | |
124 tree uprecm1 = build_int_cst (op1_utype, op0_prec - 1); | |
125 | |
126 op0 = unshare_expr (op0); | |
127 op1 = unshare_expr (op1); | |
128 | |
129 t = fold_convert_loc (loc, op1_utype, op1); | |
130 t = fold_build2 (GT_EXPR, boolean_type_node, t, uprecm1); | |
131 | |
132 /* If this is not a signed operation, don't perform overflow checks. | |
133 Also punt on bit-fields. */ | |
134 if (TYPE_OVERFLOW_WRAPS (type0) | |
135 || GET_MODE_BITSIZE (TYPE_MODE (type0)) != TYPE_PRECISION (type0) | |
136 || !sanitize_flags_p (SANITIZE_SHIFT_BASE)) | |
137 ; | |
138 | |
139 /* For signed x << y, in C99/C11, the following: | |
140 (unsigned) x >> (uprecm1 - y) | |
141 if non-zero, is undefined. */ | |
142 else if (code == LSHIFT_EXPR && flag_isoc99 && cxx_dialect < cxx11) | |
143 { | |
144 tree x = fold_build2 (MINUS_EXPR, op1_utype, uprecm1, | |
145 fold_convert (op1_utype, unshare_expr (op1))); | |
146 tt = fold_convert_loc (loc, unsigned_type_for (type0), op0); | |
147 tt = fold_build2 (RSHIFT_EXPR, TREE_TYPE (tt), tt, x); | |
148 tt = fold_build2 (NE_EXPR, boolean_type_node, tt, | |
149 build_int_cst (TREE_TYPE (tt), 0)); | |
150 } | |
151 | |
152 /* For signed x << y, in C++11 and later, the following: | |
153 x < 0 || ((unsigned) x >> (uprecm1 - y)) | |
154 if > 1, is undefined. */ | |
155 else if (code == LSHIFT_EXPR && cxx_dialect >= cxx11) | |
156 { | |
157 tree x = fold_build2 (MINUS_EXPR, op1_utype, uprecm1, | |
158 fold_convert (op1_utype, unshare_expr (op1))); | |
159 tt = fold_convert_loc (loc, unsigned_type_for (type0), | |
160 unshare_expr (op0)); | |
161 tt = fold_build2 (RSHIFT_EXPR, TREE_TYPE (tt), tt, x); | |
162 tt = fold_build2 (GT_EXPR, boolean_type_node, tt, | |
163 build_int_cst (TREE_TYPE (tt), 1)); | |
164 x = fold_build2 (LT_EXPR, boolean_type_node, unshare_expr (op0), | |
165 build_int_cst (type0, 0)); | |
166 tt = fold_build2 (TRUTH_OR_EXPR, boolean_type_node, x, tt); | |
167 } | |
168 | |
169 /* If the condition was folded to 0, no need to instrument | |
170 this expression. */ | |
171 if (integer_zerop (t) && (tt == NULL_TREE || integer_zerop (tt))) | |
172 return NULL_TREE; | |
173 | |
174 /* In case we have a SAVE_EXPR in a conditional context, we need to | |
175 make sure it gets evaluated before the condition. */ | |
176 t = fold_build2 (COMPOUND_EXPR, TREE_TYPE (t), unshare_expr (op0), t); | |
177 t = fold_build2 (COMPOUND_EXPR, TREE_TYPE (t), unshare_expr (op1), t); | |
178 | |
179 enum sanitize_code recover_kind = SANITIZE_SHIFT_EXPONENT; | |
180 tree else_t = void_node; | |
181 if (tt) | |
182 { | |
183 if (!sanitize_flags_p (SANITIZE_SHIFT_EXPONENT)) | |
184 { | |
185 t = fold_build1 (TRUTH_NOT_EXPR, boolean_type_node, t); | |
186 t = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, t, tt); | |
187 recover_kind = SANITIZE_SHIFT_BASE; | |
188 } | |
189 else | |
190 { | |
191 if (flag_sanitize_undefined_trap_on_error | |
192 || ((!(flag_sanitize_recover & SANITIZE_SHIFT_EXPONENT)) | |
193 == (!(flag_sanitize_recover & SANITIZE_SHIFT_BASE)))) | |
194 t = fold_build2 (TRUTH_OR_EXPR, boolean_type_node, t, tt); | |
195 else | |
196 else_t = tt; | |
197 } | |
198 } | |
199 | |
200 if (flag_sanitize_undefined_trap_on_error) | |
201 tt = build_call_expr_loc (loc, builtin_decl_explicit (BUILT_IN_TRAP), 0); | |
202 else | |
203 { | |
204 tree data = ubsan_create_data ("__ubsan_shift_data", 1, &loc, | |
205 ubsan_type_descriptor (type0), | |
206 ubsan_type_descriptor (type1), NULL_TREE, | |
207 NULL_TREE); | |
208 data = build_fold_addr_expr_loc (loc, data); | |
209 | |
210 enum built_in_function bcode | |
211 = (flag_sanitize_recover & recover_kind) | |
212 ? BUILT_IN_UBSAN_HANDLE_SHIFT_OUT_OF_BOUNDS | |
213 : BUILT_IN_UBSAN_HANDLE_SHIFT_OUT_OF_BOUNDS_ABORT; | |
214 tt = builtin_decl_explicit (bcode); | |
215 op0 = unshare_expr (op0); | |
216 op1 = unshare_expr (op1); | |
217 tt = build_call_expr_loc (loc, tt, 3, data, ubsan_encode_value (op0), | |
218 ubsan_encode_value (op1)); | |
219 if (else_t != void_node) | |
220 { | |
221 bcode = (flag_sanitize_recover & SANITIZE_SHIFT_BASE) | |
222 ? BUILT_IN_UBSAN_HANDLE_SHIFT_OUT_OF_BOUNDS | |
223 : BUILT_IN_UBSAN_HANDLE_SHIFT_OUT_OF_BOUNDS_ABORT; | |
224 tree else_tt = builtin_decl_explicit (bcode); | |
225 op0 = unshare_expr (op0); | |
226 op1 = unshare_expr (op1); | |
227 else_tt = build_call_expr_loc (loc, else_tt, 3, data, | |
228 ubsan_encode_value (op0), | |
229 ubsan_encode_value (op1)); | |
230 else_t = fold_build3 (COND_EXPR, void_type_node, else_t, | |
231 else_tt, void_node); | |
232 } | |
233 } | |
234 t = fold_build3 (COND_EXPR, void_type_node, t, tt, else_t); | |
235 | |
236 return t; | |
237 } | |
238 | |
239 /* Instrument variable length array bound. */ | |
240 | |
241 tree | |
242 ubsan_instrument_vla (location_t loc, tree size) | |
243 { | |
244 tree type = TREE_TYPE (size); | |
245 tree t, tt; | |
246 | |
247 t = fold_build2 (LE_EXPR, boolean_type_node, size, build_int_cst (type, 0)); | |
248 if (flag_sanitize_undefined_trap_on_error) | |
249 tt = build_call_expr_loc (loc, builtin_decl_explicit (BUILT_IN_TRAP), 0); | |
250 else | |
251 { | |
252 tree data = ubsan_create_data ("__ubsan_vla_data", 1, &loc, | |
253 ubsan_type_descriptor (type), NULL_TREE, | |
254 NULL_TREE); | |
255 data = build_fold_addr_expr_loc (loc, data); | |
256 enum built_in_function bcode | |
257 = (flag_sanitize_recover & SANITIZE_VLA) | |
258 ? BUILT_IN_UBSAN_HANDLE_VLA_BOUND_NOT_POSITIVE | |
259 : BUILT_IN_UBSAN_HANDLE_VLA_BOUND_NOT_POSITIVE_ABORT; | |
260 tt = builtin_decl_explicit (bcode); | |
261 tt = build_call_expr_loc (loc, tt, 2, data, ubsan_encode_value (size)); | |
262 } | |
263 t = fold_build3 (COND_EXPR, void_type_node, t, tt, void_node); | |
264 | |
265 return t; | |
266 } | |
267 | |
268 /* Instrument missing return in C++ functions returning non-void. */ | |
269 | |
270 tree | |
271 ubsan_instrument_return (location_t loc) | |
272 { | |
273 if (flag_sanitize_undefined_trap_on_error) | |
274 return build_call_expr_loc (loc, builtin_decl_explicit (BUILT_IN_TRAP), 0); | |
275 | |
276 tree data = ubsan_create_data ("__ubsan_missing_return_data", 1, &loc, | |
277 NULL_TREE, NULL_TREE); | |
278 tree t = builtin_decl_explicit (BUILT_IN_UBSAN_HANDLE_MISSING_RETURN); | |
279 return build_call_expr_loc (loc, t, 1, build_fold_addr_expr_loc (loc, data)); | |
280 } | |
281 | |
282 /* Instrument array bounds for ARRAY_REFs. We create special builtin, | |
283 that gets expanded in the sanopt pass, and make an array dimension | |
284 of it. ARRAY is the array, *INDEX is an index to the array. | |
285 Return NULL_TREE if no instrumentation is emitted. | |
286 IGNORE_OFF_BY_ONE is true if the ARRAY_REF is inside a ADDR_EXPR. */ | |
287 | |
288 tree | |
289 ubsan_instrument_bounds (location_t loc, tree array, tree *index, | |
290 bool ignore_off_by_one) | |
291 { | |
292 tree type = TREE_TYPE (array); | |
293 tree domain = TYPE_DOMAIN (type); | |
294 | |
295 if (domain == NULL_TREE || TYPE_MAX_VALUE (domain) == NULL_TREE) | |
296 return NULL_TREE; | |
297 | |
298 tree bound = TYPE_MAX_VALUE (domain); | |
299 if (ignore_off_by_one) | |
300 bound = fold_build2 (PLUS_EXPR, TREE_TYPE (bound), bound, | |
301 build_int_cst (TREE_TYPE (bound), 1)); | |
302 | |
303 /* Detect flexible array members and suchlike, unless | |
304 -fsanitize=bounds-strict. */ | |
305 tree base = get_base_address (array); | |
306 if (!sanitize_flags_p (SANITIZE_BOUNDS_STRICT) | |
307 && TREE_CODE (array) == COMPONENT_REF | |
308 && base && (INDIRECT_REF_P (base) || TREE_CODE (base) == MEM_REF)) | |
309 { | |
310 tree next = NULL_TREE; | |
311 tree cref = array; | |
312 | |
313 /* Walk all structs/unions. */ | |
314 while (TREE_CODE (cref) == COMPONENT_REF) | |
315 { | |
316 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (cref, 0))) == RECORD_TYPE) | |
317 for (next = DECL_CHAIN (TREE_OPERAND (cref, 1)); | |
318 next && TREE_CODE (next) != FIELD_DECL; | |
319 next = DECL_CHAIN (next)) | |
320 ; | |
321 if (next) | |
322 /* Not a last element. Instrument it. */ | |
323 break; | |
324 /* Ok, this is the last field of the structure/union. But the | |
325 aggregate containing the field must be the last field too, | |
326 recursively. */ | |
327 cref = TREE_OPERAND (cref, 0); | |
328 } | |
329 if (!next) | |
330 /* Don't instrument this flexible array member-like array in non-strict | |
331 -fsanitize=bounds mode. */ | |
332 return NULL_TREE; | |
333 } | |
334 | |
335 /* Don't emit instrumentation in the most common cases. */ | |
336 tree idx = NULL_TREE; | |
337 if (TREE_CODE (*index) == INTEGER_CST) | |
338 idx = *index; | |
339 else if (TREE_CODE (*index) == BIT_AND_EXPR | |
340 && TREE_CODE (TREE_OPERAND (*index, 1)) == INTEGER_CST) | |
341 idx = TREE_OPERAND (*index, 1); | |
342 if (idx | |
343 && TREE_CODE (bound) == INTEGER_CST | |
344 && tree_int_cst_sgn (idx) >= 0 | |
345 && tree_int_cst_le (idx, bound)) | |
346 return NULL_TREE; | |
347 | |
348 *index = save_expr (*index); | |
349 /* Create a "(T *) 0" tree node to describe the array type. */ | |
350 tree zero_with_type = build_int_cst (build_pointer_type (type), 0); | |
351 return build_call_expr_internal_loc (loc, IFN_UBSAN_BOUNDS, | |
352 void_type_node, 3, zero_with_type, | |
353 *index, bound); | |
354 } | |
355 | |
356 /* Return true iff T is an array that was instrumented by SANITIZE_BOUNDS. */ | |
357 | |
358 bool | |
359 ubsan_array_ref_instrumented_p (const_tree t) | |
360 { | |
361 if (TREE_CODE (t) != ARRAY_REF) | |
362 return false; | |
363 | |
364 tree op1 = TREE_OPERAND (t, 1); | |
365 return TREE_CODE (op1) == COMPOUND_EXPR | |
366 && TREE_CODE (TREE_OPERAND (op1, 0)) == CALL_EXPR | |
367 && CALL_EXPR_FN (TREE_OPERAND (op1, 0)) == NULL_TREE | |
368 && CALL_EXPR_IFN (TREE_OPERAND (op1, 0)) == IFN_UBSAN_BOUNDS; | |
369 } | |
370 | |
371 /* Instrument an ARRAY_REF, if it hasn't already been instrumented. | |
372 IGNORE_OFF_BY_ONE is true if the ARRAY_REF is inside a ADDR_EXPR. */ | |
373 | |
374 void | |
375 ubsan_maybe_instrument_array_ref (tree *expr_p, bool ignore_off_by_one) | |
376 { | |
377 if (!ubsan_array_ref_instrumented_p (*expr_p) | |
378 && sanitize_flags_p (SANITIZE_BOUNDS | SANITIZE_BOUNDS_STRICT) | |
379 && current_function_decl != NULL_TREE) | |
380 { | |
381 tree op0 = TREE_OPERAND (*expr_p, 0); | |
382 tree op1 = TREE_OPERAND (*expr_p, 1); | |
383 tree e = ubsan_instrument_bounds (EXPR_LOCATION (*expr_p), op0, &op1, | |
384 ignore_off_by_one); | |
385 if (e != NULL_TREE) | |
386 { | |
387 tree t = copy_node (*expr_p); | |
388 TREE_OPERAND (t, 1) = build2 (COMPOUND_EXPR, TREE_TYPE (op1), | |
389 e, op1); | |
390 *expr_p = t; | |
391 } | |
392 } | |
393 } | |
394 | |
395 static tree | |
396 ubsan_maybe_instrument_reference_or_call (location_t loc, tree op, tree ptype, | |
397 enum ubsan_null_ckind ckind) | |
398 { | |
399 if (!sanitize_flags_p (SANITIZE_ALIGNMENT | SANITIZE_NULL) | |
400 || current_function_decl == NULL_TREE) | |
401 return NULL_TREE; | |
402 | |
403 tree type = TREE_TYPE (ptype); | |
404 tree orig_op = op; | |
405 bool instrument = false; | |
406 unsigned int mina = 0; | |
407 | |
408 if (sanitize_flags_p (SANITIZE_ALIGNMENT)) | |
409 { | |
410 mina = min_align_of_type (type); | |
411 if (mina <= 1) | |
412 mina = 0; | |
413 } | |
414 while ((TREE_CODE (op) == NOP_EXPR | |
415 || TREE_CODE (op) == NON_LVALUE_EXPR) | |
416 && TREE_CODE (TREE_TYPE (op)) == POINTER_TYPE) | |
417 op = TREE_OPERAND (op, 0); | |
418 if (TREE_CODE (op) == NOP_EXPR | |
419 && TREE_CODE (TREE_TYPE (op)) == REFERENCE_TYPE) | |
420 { | |
421 if (mina && mina > min_align_of_type (TREE_TYPE (TREE_TYPE (op)))) | |
422 instrument = true; | |
423 } | |
424 else | |
425 { | |
426 if (sanitize_flags_p (SANITIZE_NULL) && TREE_CODE (op) == ADDR_EXPR) | |
427 { | |
428 bool strict_overflow_p = false; | |
429 /* tree_single_nonzero_warnv_p will not return true for non-weak | |
430 non-automatic decls with -fno-delete-null-pointer-checks, | |
431 which is disabled during -fsanitize=null. We don't want to | |
432 instrument those, just weak vars though. */ | |
433 int save_flag_delete_null_pointer_checks | |
434 = flag_delete_null_pointer_checks; | |
435 flag_delete_null_pointer_checks = 1; | |
436 if (!tree_single_nonzero_warnv_p (op, &strict_overflow_p) | |
437 || strict_overflow_p) | |
438 instrument = true; | |
439 flag_delete_null_pointer_checks | |
440 = save_flag_delete_null_pointer_checks; | |
441 } | |
442 else if (sanitize_flags_p (SANITIZE_NULL)) | |
443 instrument = true; | |
444 if (mina && mina > 1) | |
445 { | |
446 if (!POINTER_TYPE_P (TREE_TYPE (op)) | |
447 || mina > get_pointer_alignment (op) / BITS_PER_UNIT) | |
448 instrument = true; | |
449 } | |
450 } | |
451 if (!instrument) | |
452 return NULL_TREE; | |
453 op = save_expr (orig_op); | |
454 gcc_assert (POINTER_TYPE_P (ptype)); | |
455 if (TREE_CODE (ptype) == REFERENCE_TYPE) | |
456 ptype = build_pointer_type (TREE_TYPE (ptype)); | |
457 tree kind = build_int_cst (ptype, ckind); | |
458 tree align = build_int_cst (pointer_sized_int_node, mina); | |
459 tree call | |
460 = build_call_expr_internal_loc (loc, IFN_UBSAN_NULL, void_type_node, | |
461 3, op, kind, align); | |
462 TREE_SIDE_EFFECTS (call) = 1; | |
463 return fold_build2 (COMPOUND_EXPR, TREE_TYPE (op), call, op); | |
464 } | |
465 | |
466 /* Instrument a NOP_EXPR to REFERENCE_TYPE or INTEGER_CST with REFERENCE_TYPE | |
467 type if needed. */ | |
468 | |
469 void | |
470 ubsan_maybe_instrument_reference (tree *stmt_p) | |
471 { | |
472 tree stmt = *stmt_p; | |
473 tree op = stmt; | |
474 if (TREE_CODE (stmt) == NOP_EXPR) | |
475 op = TREE_OPERAND (stmt, 0); | |
476 op = ubsan_maybe_instrument_reference_or_call (EXPR_LOCATION (stmt), op, | |
477 TREE_TYPE (stmt), | |
478 UBSAN_REF_BINDING); | |
479 if (op) | |
480 { | |
481 if (TREE_CODE (stmt) == NOP_EXPR) | |
482 TREE_OPERAND (stmt, 0) = op; | |
483 else | |
484 *stmt_p = op; | |
485 } | |
486 } | |
487 | |
488 /* Instrument a CALL_EXPR to a method if needed. */ | |
489 | |
490 void | |
491 ubsan_maybe_instrument_member_call (tree stmt, bool is_ctor) | |
492 { | |
493 if (call_expr_nargs (stmt) == 0) | |
494 return; | |
495 tree op = CALL_EXPR_ARG (stmt, 0); | |
496 if (op == error_mark_node | |
497 || !POINTER_TYPE_P (TREE_TYPE (op))) | |
498 return; | |
499 op = ubsan_maybe_instrument_reference_or_call (EXPR_LOCATION (stmt), op, | |
500 TREE_TYPE (op), | |
501 is_ctor ? UBSAN_CTOR_CALL | |
502 : UBSAN_MEMBER_CALL); | |
503 if (op) | |
504 CALL_EXPR_ARG (stmt, 0) = op; | |
505 } |