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28 lines
631 B
28 lines
631 B
4 months ago
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// RUN: %clangxx_msan -O2 %s -o %t && %run %t
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#include <sanitizer/msan_interface.h>
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struct S {
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S(int a0) : a(a0) {}
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int a;
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int b;
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};
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// Here S is passed to FooRun as a 64-bit integer.
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// This triggers an optimization where 10000 * s.a is transformed into
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// ((*(uint64_t *)&s) * (10000 * 2**32)) >> 32
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// Test that MSan understands that this kills the uninitialized high half of S
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// (i.e. S::b).
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void FooRun(S s) {
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int64_t x = 10000 * s.a;
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__msan_check_mem_is_initialized(&x, sizeof(x));
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}
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int main(void) {
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S z(1);
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// Take &z to ensure that it is built on stack.
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S *volatile p = &z;
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FooRun(z);
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return 0;
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}
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