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55 lines
1.1 KiB
55 lines
1.1 KiB
// Verifies that speculative loads from unions do not happen under asan.
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// RUN: %clangxx_asan -O0 %s -o %t && %run %t 2>&1
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// RUN: %clangxx_asan -O1 %s -o %t && %run %t 2>&1
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// RUN: %clangxx_asan -O2 %s -o %t && %run %t 2>&1
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// RUN: %clangxx_asan -O3 %s -o %t && %run %t 2>&1
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#include <sanitizer/asan_interface.h>
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struct S {
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struct _long {
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void* _pad;
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const char* _ptr;
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};
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struct _short {
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unsigned char _size;
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char _ch[23];
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};
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union {
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_short _s;
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_long _l;
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} _data;
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S() {
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_data._s._size = 0;
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__asan_poison_memory_region(_data._s._ch, 23);
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}
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~S() {
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__asan_unpoison_memory_region(_data._s._ch, 23);
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}
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bool is_long() const {
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return _data._s._size & 1;
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}
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const char* get_pointer() const {
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return is_long() ? _data._l._ptr : _data._s._ch;
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}
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};
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inline void side_effect(const void *arg) {
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__asm__ __volatile__("" : : "r" (arg) : "memory");
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}
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int main(int argc, char **argv) {
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S s;
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side_effect(&s); // optimizer is too smart otherwise
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const char *ptr = s.get_pointer();
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side_effect(ptr); // force use ptr
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return 0;
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}
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