| 1 | // RUN: %clang_msan -fsanitize-memory-track-origins=2 %libatomic -DTEST_STORE -O0 %s -o %t && %run %t 2>&1 |
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| 2 | // RUN: %clang_msan -fsanitize-memory-track-origins=0 %libatomic -DTEST_LOAD -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK |
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| 3 | // RUN: %clang_msan -fsanitize-memory-track-origins=2 %libatomic -DTEST_LOAD -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SHADOW |
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| 4 | |
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| 5 | // PPC has no libatomic |
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| 6 | // UNSUPPORTED: powerpc64-target-arch |
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| 7 | // UNSUPPORTED: powerpc64le-target-arch |
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| 8 | |
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| 9 | #include <sanitizer/msan_interface.h> |
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| 10 | #include <stdatomic.h> |
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| 11 | |
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| 12 | typedef struct __attribute((packed)) { |
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| 13 | uint8_t val[3]; |
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| 14 | } i24; |
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| 15 | |
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| 16 | void copy(i24 *dst, i24 *src); |
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| 17 | |
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| 18 | int main() { |
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| 19 | i24 uninit; |
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| 20 | i24 init = {0}; |
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| 21 | |
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| 22 | __msan_check_mem_is_initialized(x: &init, size: 3); |
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| 23 | copy(dst: &init, src: &uninit); |
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| 24 | __msan_check_mem_is_initialized(x: &init, size: 3); |
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| 25 | } |
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| 26 | |
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| 27 | void copy(i24 *dst, i24 *src) { |
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| 28 | #ifdef TEST_LOAD |
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| 29 | __atomic_load(src, dst, __ATOMIC_RELAXED); |
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| 30 | |
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| 31 | // CHECK: MemorySanitizer: use-of-uninitialized-value |
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| 32 | // CHECK: #0 {{0x[a-f0-9]+}} in main{{.*}}libatomic.c:[[@LINE-8]] |
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| 33 | |
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| 34 | // CHECK-SHADOW: Uninitialized value was stored to memory at |
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| 35 | // CHECK-SHADOW: #0 {{0x[a-f0-9]+}} in copy{{.*}}libatomic.c:[[@LINE-6]] |
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| 36 | #endif |
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| 37 | #ifdef TEST_STORE |
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| 38 | // Store always writes a clean shadow |
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| 39 | __atomic_store(src, dst, __ATOMIC_RELAXED); |
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| 40 | #endif |
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| 41 | } |
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| 42 | |
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