| 1 | //===-- FPExceptMatchers.cpp ----------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "FPExceptMatcher.h" |
| 10 | |
| 11 | #include "test/UnitTest/Test.h" |
| 12 | |
| 13 | #include "hdr/types/fenv_t.h" |
| 14 | #include "src/__support/FPUtil/FEnvImpl.h" |
| 15 | #include <memory> |
| 16 | #include <setjmp.h> |
| 17 | #include <signal.h> |
| 18 | |
| 19 | #if LIBC_TEST_HAS_MATCHERS() |
| 20 | |
| 21 | namespace LIBC_NAMESPACE { |
| 22 | namespace testing { |
| 23 | |
| 24 | #if defined(_WIN32) |
| 25 | #define sigjmp_buf jmp_buf |
| 26 | #define sigsetjmp(buf, save) setjmp(buf) |
| 27 | #define siglongjmp(buf, val) longjmp(buf, val) |
| 28 | #endif |
| 29 | |
| 30 | static thread_local sigjmp_buf jumpBuffer; |
| 31 | static thread_local bool caughtExcept; |
| 32 | |
| 33 | static void sigfpeHandler(int sig) { |
| 34 | caughtExcept = true; |
| 35 | siglongjmp(env: jumpBuffer, val: -1); |
| 36 | } |
| 37 | |
| 38 | FPExceptMatcher::FPExceptMatcher(FunctionCaller *func) { |
| 39 | auto oldSIGFPEHandler = signal(SIGFPE, handler: &sigfpeHandler); |
| 40 | std::unique_ptr<FunctionCaller> funcUP(func); |
| 41 | |
| 42 | caughtExcept = false; |
| 43 | fenv_t oldEnv; |
| 44 | fputil::get_env(envp: &oldEnv); |
| 45 | if (sigsetjmp(jumpBuffer, 1) == 0) |
| 46 | funcUP->call(); |
| 47 | // We restore the previous floating point environment after |
| 48 | // the call to the function which can potentially raise SIGFPE. |
| 49 | fputil::set_env(&oldEnv); |
| 50 | signal(SIGFPE, handler: oldSIGFPEHandler); |
| 51 | exceptionRaised = caughtExcept; |
| 52 | } |
| 53 | |
| 54 | } // namespace testing |
| 55 | } // namespace LIBC_NAMESPACE |
| 56 | |
| 57 | #endif // LIBC_TEST_HAS_MATCHERS() |
| 58 |