Differential D5118 Diff 15915 src/compat/glibc_sanity.cpp

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src/compat/glibc_sanity.cpp

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	// trigger: Use the memcpy_int wrapper which calls our internal memcpy.			// trigger: Use the memcpy_int wrapper which calls our internal memcpy.
	// A direct call to memcpy may be optimized away by the compiler.			// A direct call to memcpy may be optimized away by the compiler.
	// test: Fill an array with a sequence of integers. memcpy to a new empty array.			// test: Fill an array with a sequence of integers. memcpy to a new empty array.
	// Verify that the arrays are equal. Use an odd size to decrease the odds of			// Verify that the arrays are equal. Use an odd size to decrease the odds of
	// the call being optimized away.			// the call being optimized away.
	template <unsigned int T> bool sanity_test_memcpy() {			template <unsigned int T> bool sanity_test_memcpy() {
	unsigned int memcpy_test[T];			unsigned int memcpy_test[T];
	unsigned int memcpy_verify[T] = {};			unsigned int memcpy_verify[T] = {};
	for (unsigned int i = 0; i != T; ++i)			for (unsigned int i = 0; i != T; ++i) {
	memcpy_test[i] = i;			memcpy_test[i] = i;
				}

	memcpy_int(memcpy_verify, memcpy_test, sizeof(memcpy_test));			memcpy_int(memcpy_verify, memcpy_test, sizeof(memcpy_test));

	for (unsigned int i = 0; i != T; ++i) {			for (unsigned int i = 0; i != T; ++i) {
	if (memcpy_verify[i] != i) return false;			if (memcpy_verify[i] != i) {
				return false;
				}
	}			}
	return true;			return true;
	}			}

	#if defined(HAVE_SYS_SELECT_H)			#if defined(HAVE_SYS_SELECT_H)
	// trigger: Call FD_SET to trigger __fdelt_chk. FORTIFY_SOURCE must be defined			// trigger: Call FD_SET to trigger __fdelt_chk. FORTIFY_SOURCE must be defined
	// as >0 and optimizations must be set to at least -O2.			// as >0 and optimizations must be set to at least -O2.
	// test: Add a file descriptor to an empty fd_set. Verify that it has been			// test: Add a file descriptor to an empty fd_set. Verify that it has been
	// correctly added.			// correctly added.
	bool sanity_test_fdelt() {			bool sanity_test_fdelt() {
	fd_set fds;			fd_set fds;
	FD_ZERO(&fds);			FD_ZERO(&fds);
	FD_SET(0, &fds);			FD_SET(0, &fds);
	return FD_ISSET(0, &fds);			return FD_ISSET(0, &fds);
	}			}
	#endif			#endif

	} // namespace			} // namespace

	bool glibc_sanity_test() {			bool glibc_sanity_test() {
	#if defined(HAVE_SYS_SELECT_H)			#if defined(HAVE_SYS_SELECT_H)
	if (!sanity_test_fdelt()) return false;			if (!sanity_test_fdelt()) {
				return false;
				}
	#endif			#endif
	return sanity_test_memcpy<1025>();			return sanity_test_memcpy<1025>();
	}			}