Vendor import of compiler-rt release_39 branch r288513:
https://llvm.org/svn/llvm-project/compiler-rt/branches/release_39@288513
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/vendor/compiler-rt/dist/; revision=309431 svn path=/vendor/compiler-rt/compiler-rt-release_391-r289601/; revision=310164; tag=vendor/compiler-rt/compiler-rt-release_391-r289601
@ -17,6 +17,21 @@ typedef uint64_t semval_t;
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typedef unsigned semval_t;
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#endif
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// glibc 2.21 has introduced some changes in the way the semaphore value is
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// handled for 32-bit platforms, but since these changes are not ABI-breaking
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// they are not versioned. On newer platforms such as ARM, there is only one
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// version of the symbol, so it's enough to check the glibc version. However,
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// for old platforms such as i386, glibc contains two or even three versions of
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// the sem_init symbol, and the sanitizers always pick the oldest one.
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// Therefore, it is not enough to rely on the __GLIBC_PREREQ macro - we should
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// instead check the platform as well to make sure we only expect the new
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// behavior on platforms where the older symbols do not exist.
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#if defined(__arm__) && __GLIBC_PREREQ(2, 21)
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#define GET_SEM_VALUE(V) ((V) >> 1)
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#else
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#define GET_SEM_VALUE(V) (V)
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#endif
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void my_sem_init(bool priv, int value, semval_t *a, unsigned char *b) {
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sem_t sem;
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memset(&sem, 0xAB, sizeof(sem));
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@ -34,10 +49,10 @@ int main() {
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unsigned char b;
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my_sem_init(false, 42, &a, &b);
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assert(a == 42);
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assert(GET_SEM_VALUE(a) == 42);
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assert(b != 0xAB);
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my_sem_init(true, 43, &a, &b);
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assert(a == 43);
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assert(GET_SEM_VALUE(a) == 43);
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assert(b != 0xAB);
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}
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