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Vendor import of compiler-rt release_39 branch r288513:

Browse Source 
https://llvm.org/svn/llvm-project/compiler-rt/branches/release_39@288513
This commit is contained in:
Dimitry Andric 2016-12-02 19:20:26 +00:00
parent 7ade6c809a
commit 0230fcf22f
1 changed files with 17 additions and 2 deletions
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19
test/sanitizer_common/TestCases/Linux/sem_init_glibc.cc
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@ -17,6 +17,21 @@ typedef uint64_t semval_t;
typedef unsigned semval_t;
#endif
// glibc 2.21 has introduced some changes in the way the semaphore value is
// handled for 32-bit platforms, but since these changes are not ABI-breaking
// they are not versioned. On newer platforms such as ARM, there is only one
// version of the symbol, so it's enough to check the glibc version. However,
// for old platforms such as i386, glibc contains two or even three versions of
// the sem_init symbol, and the sanitizers always pick the oldest one.
// Therefore, it is not enough to rely on the __GLIBC_PREREQ macro - we should
// instead check the platform as well to make sure we only expect the new
// behavior on platforms where the older symbols do not exist.
#if defined(__arm__) && __GLIBC_PREREQ(2, 21)
#define GET_SEM_VALUE(V) ((V) >> 1)
#else
#define GET_SEM_VALUE(V) (V)
#endif
void my_sem_init(bool priv, int value, semval_t *a, unsigned char *b) {
sem_t sem;
memset(&sem, 0xAB, sizeof(sem));
@ -34,10 +49,10 @@ int main() {
unsigned char b;
my_sem_init(false, 42, &a, &b);
assert(a == 42);
assert(GET_SEM_VALUE(a) == 42);
assert(b != 0xAB);
my_sem_init(true, 43, &a, &b);
assert(a == 43);
assert(GET_SEM_VALUE(a) == 43);
assert(b != 0xAB);
}