| 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 | #include <stdio.h> |
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| 5 | #include <stdlib.h> |
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| 6 | |
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| 7 | // Violation reported in https://github.com/llvm/llvm-project/issues/86685. |
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| 8 | void foo(int *s, float *f, long n) { |
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| 9 | for (long i = 0; i < n; ++i) { |
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| 10 | *f = 2; |
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| 11 | if (i == 1) |
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| 12 | break; |
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| 13 | |
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| 14 | // CHECK: TypeSanitizer: type-aliasing-violation on address |
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| 15 | // CHECK-NEXT: WRITE of size 4 at {{.+}} with type int accesses an existing object of type float |
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| 16 | // CHECK-NEXT: #0 {{.+}} in foo {{.*/?}}violation-pr86685.c:17 |
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| 17 | *s = 4; |
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| 18 | } |
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| 19 | } |
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| 20 | |
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| 21 | int main(void) { |
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| 22 | union { |
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| 23 | int s; |
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| 24 | float f; |
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| 25 | } u = {0}; |
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| 26 | foo(s: &u.s, f: &u.f, n: 2); |
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| 27 | printf(format: "%.f\n" , u.f); |
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| 28 | return 0; |
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| 29 | } |
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| 30 | |
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