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
foo(const int * p)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
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 }
62