| Vedant Kumar | d919115 | 2017-05-02 23:46:56 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -x c -S -emit-llvm -o - -triple x86_64-apple-darwin10 %s \ |
| 2 | // RUN: -w -fsanitize=signed-integer-overflow,unsigned-integer-overflow,integer-divide-by-zero,float-divide-by-zero \ |
| 3 | // RUN: | FileCheck %s |
| 4 | |
| 5 | // CHECK-LABEL: define void @foo |
| 6 | // CHECK-NOT: !nosanitize |
| 7 | void foo(const int *p) { |
| 8 | // __builtin_prefetch expects its optional arguments to be constant integers. |
| 9 | // Check that ubsan does not instrument any safe arithmetic performed in |
| 10 | // operands to __builtin_prefetch. (A clang frontend check should reject |
| 11 | // unsafe arithmetic in these operands.) |
| 12 | |
| 13 | __builtin_prefetch(p, 0 + 1, 0 + 3); |
| 14 | __builtin_prefetch(p, 1 - 0, 3 - 0); |
| 15 | __builtin_prefetch(p, 1 * 1, 1 * 3); |
| 16 | __builtin_prefetch(p, 1 / 1, 3 / 1); |
| 17 | __builtin_prefetch(p, 3 % 2, 3 % 1); |
| 18 | |
| 19 | __builtin_prefetch(p, 0U + 1U, 0U + 3U); |
| 20 | __builtin_prefetch(p, 1U - 0U, 3U - 0U); |
| 21 | __builtin_prefetch(p, 1U * 1U, 1U * 3U); |
| 22 | __builtin_prefetch(p, 1U / 1U, 3U / 1U); |
| 23 | __builtin_prefetch(p, 3U % 2U, 3U % 1U); |
| 24 | } |
| 25 | |
| 26 | // CHECK-LABEL: define void @ub_constant_arithmetic |
| 27 | void ub_constant_arithmetic() { |
| 28 | // Check that we still instrument unsafe arithmetic, even if it is known to |
| 29 | // be unsafe at compile time. |
| 30 | |
| 31 | int INT_MIN = 0xffffffff; |
| 32 | int INT_MAX = 0x7fffffff; |
| 33 | |
| 34 | // CHECK: call void @__ubsan_handle_add_overflow |
| 35 | // CHECK: call void @__ubsan_handle_add_overflow |
| 36 | INT_MAX + 1; |
| 37 | INT_MAX + -1; |
| 38 | |
| 39 | // CHECK: call void @__ubsan_handle_negate_overflow |
| 40 | // CHECK: call void @__ubsan_handle_sub_overflow |
| 41 | -INT_MIN; |
| 42 | -INT_MAX - 2; |
| 43 | |
| 44 | // CHECK: call void @__ubsan_handle_mul_overflow |
| 45 | // CHECK: call void @__ubsan_handle_mul_overflow |
| 46 | INT_MAX * INT_MAX; |
| 47 | INT_MIN * INT_MIN; |
| 48 | |
| 49 | // CHECK: call void @__ubsan_handle_divrem_overflow |
| 50 | // CHECK: call void @__ubsan_handle_divrem_overflow |
| 51 | 1 / 0; |
| 52 | INT_MIN / -1; |
| 53 | |
| 54 | // CHECK: call void @__ubsan_handle_divrem_overflow |
| 55 | // CHECK: call void @__ubsan_handle_divrem_overflow |
| 56 | 1 % 0; |
| 57 | INT_MIN % -1; |
| 58 | |
| 59 | // CHECK: call void @__ubsan_handle_divrem_overflow |
| 60 | 1.0 / 0.0; |
| 61 | } |