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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/trap-handler/trap-handler.h"
#include "include/v8.h"
#include "testing/gtest/include/gtest/gtest.h"
#if V8_OS_POSIX
#include <setjmp.h>
#include <signal.h>
#endif
namespace {
#if V8_TRAP_HANDLER_SUPPORTED
void CrashOnPurpose() { *reinterpret_cast<volatile int*>(42); }
// When using V8::RegisterDefaultSignalHandler, we save the old one to fall back
// on if V8 doesn't handle the signal. This allows tools like ASan to register a
// handler early on during the process startup and still generate stack traces
// on failures.
class SignalHandlerFallbackTest : public ::testing::Test {
protected:
void SetUp() override {
struct sigaction action;
action.sa_sigaction = SignalHandler;
sigemptyset(&action.sa_mask);
action.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV, &action, &old_segv_action_);
sigaction(SIGBUS, &action, &old_bus_action_);
}
void TearDown() override {
// be a good citizen and restore the old signal handler.
sigaction(SIGSEGV, &old_segv_action_, nullptr);
sigaction(SIGBUS, &old_bus_action_, nullptr);
}
static sigjmp_buf continuation_;
private:
static void SignalHandler(int signal, siginfo_t* info, void*) {
siglongjmp(continuation_, 1);
}
struct sigaction old_segv_action_;
struct sigaction old_bus_action_; // We get SIGBUS on Mac sometimes.
};
sigjmp_buf SignalHandlerFallbackTest::continuation_;
TEST_F(SignalHandlerFallbackTest, DoTest) {
const int save_sigs = 1;
if (!sigsetjmp(continuation_, save_sigs)) {
constexpr bool use_default_signal_handler = true;
CHECK(v8::V8::EnableWebAssemblyTrapHandler(use_default_signal_handler));
CrashOnPurpose();
FAIL();
} else {
// Our signal handler ran.
v8::internal::trap_handler::RestoreOriginalSignalHandler();
SUCCEED();
return;
}
FAIL();
}
#endif
} // namespace
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