| 1 | // RUN: %clang_tysan -O0 %s -o %t && %run %t >%t.out 2>&1 |
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| 2 | // RUN: FileCheck %s < %t.out |
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| 3 | |
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| 4 | // https://github.com/llvm/llvm-project/issues/68655 |
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| 5 | struct S1 { |
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| 6 | long long a; |
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| 7 | long long b; |
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| 8 | }; |
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| 9 | |
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| 10 | // CHECK: TypeSanitizer: type-aliasing-violation on address |
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| 11 | // CHECK-NEXT: READ of size 4 at {{.+}} with type int accesses an existing object of type long long (in {{.*}}S1 at offset 0) |
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| 12 | // CHECK-NEXT: in copyMem(S1*, S1*) {{.*/?}}violation-pr68655.cpp:19 |
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| 13 | |
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| 14 | void inline copyMem(S1 *dst, S1 *src) { |
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| 15 | unsigned *d = reinterpret_cast<unsigned *>(dst); |
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| 16 | unsigned *s = reinterpret_cast<unsigned *>(src); |
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| 17 | |
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| 18 | for (int i = 0; i < sizeof(S1) / sizeof(unsigned); i++) { |
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| 19 | *d = *s; |
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| 20 | d++; |
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| 21 | s++; |
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| 22 | } |
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| 23 | } |
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| 24 | |
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| 25 | void math(S1 *dst, int *srcA, int idx_t) { |
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| 26 | S1 zero[4]; |
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| 27 | for (int i = 0; i < 2; i++) { |
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| 28 | zero[i].a = i + idx_t; |
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| 29 | zero[i].b = i * idx_t; |
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| 30 | } |
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| 31 | |
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| 32 | copyMem(dst: &dst[idx_t], src: &zero[srcA[idx_t]]); |
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| 33 | } |
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| 34 | |
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| 35 | int main() { |
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| 36 | S1 dst = {.a: 0}; |
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| 37 | int Src[2] = {0, 0}; |
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| 38 | math(dst: &dst, srcA: &Src[0], idx_t: 0); |
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| 39 | return 0; |
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| 40 | } |
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| 41 | |
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