| 1 | // RUN: %clang_cc1 -x c -S -emit-llvm -o - -triple x86_64-apple-darwin10 %s \ |
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| 2 | // RUN: -w -fsanitize=signed-integer-overflow,unsigned-integer-overflow,integer-divide-by-zero,float-divide-by-zero \ |
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| 3 | // RUN: | FileCheck %s |
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| 4 | |
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| 5 | // CHECK-LABEL: define void @foo |
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| 6 | // CHECK-NOT: !nosanitize |
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| 7 | void foo(const int *p) { |
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| 8 | // __builtin_prefetch expects its optional arguments to be constant integers. |
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| 9 | // Check that ubsan does not instrument any safe arithmetic performed in |
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| 10 | // operands to __builtin_prefetch. (A clang frontend check should reject |
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| 11 | // unsafe arithmetic in these operands.) |
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| 12 | |
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| 13 | __builtin_prefetch(p, 0 + 1, 0 + 3); |
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| 14 | __builtin_prefetch(p, 1 - 0, 3 - 0); |
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| 15 | __builtin_prefetch(p, 1 * 1, 1 * 3); |
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| 16 | __builtin_prefetch(p, 1 / 1, 3 / 1); |
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| 17 | __builtin_prefetch(p, 3 % 2, 3 % 1); |
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| 18 | |
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| 19 | __builtin_prefetch(p, 0U + 1U, 0U + 3U); |
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| 20 | __builtin_prefetch(p, 1U - 0U, 3U - 0U); |
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| 21 | __builtin_prefetch(p, 1U * 1U, 1U * 3U); |
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| 22 | __builtin_prefetch(p, 1U / 1U, 3U / 1U); |
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| 23 | __builtin_prefetch(p, 3U % 2U, 3U % 1U); |
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| 24 | } |
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| 25 | |
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| 26 | // CHECK-LABEL: define void @ub_constant_arithmetic |
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| 27 | void ub_constant_arithmetic() { |
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| 28 | // Check that we still instrument unsafe arithmetic, even if it is known to |
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| 29 | // be unsafe at compile time. |
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| 30 | |
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| 31 | int INT_MIN = 0xffffffff; |
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| 32 | int INT_MAX = 0x7fffffff; |
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| 33 | |
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| 34 | // CHECK: call void @__ubsan_handle_add_overflow |
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| 35 | // CHECK: call void @__ubsan_handle_add_overflow |
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| 36 | INT_MAX + 1; |
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| 37 | INT_MAX + -1; |
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| 38 | |
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| 39 | // CHECK: call void @__ubsan_handle_negate_overflow |
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| 40 | // CHECK: call void @__ubsan_handle_sub_overflow |
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| 41 | -INT_MIN; |
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| 42 | -INT_MAX - 2; |
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| 43 | |
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| 44 | // CHECK: call void @__ubsan_handle_mul_overflow |
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| 45 | // CHECK: call void @__ubsan_handle_mul_overflow |
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| 46 | INT_MAX * INT_MAX; |
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| 47 | INT_MIN * INT_MIN; |
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| 48 | |
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| 49 | // CHECK: call void @__ubsan_handle_divrem_overflow |
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| 50 | // CHECK: call void @__ubsan_handle_divrem_overflow |
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| 51 | 1 / 0; |
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| 52 | INT_MIN / -1; |
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| 53 | |
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| 54 | // CHECK: call void @__ubsan_handle_divrem_overflow |
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| 55 | // CHECK: call void @__ubsan_handle_divrem_overflow |
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| 56 | 1 % 0; |
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| 57 | INT_MIN % -1; |
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| 58 | |
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| 59 | // CHECK: call void @__ubsan_handle_divrem_overflow |
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| 60 | 1.0 / 0.0; |
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| 61 | } |
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| 62 | |
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