bool
EnsureAsmJSSignalHandlersInstalled(JSRuntime *rt)
{
#if defined(XP_MACOSX)
// On OSX, each JSRuntime gets its own handler.
return rt->asmJSMachExceptionHandler.installed() || rt->asmJSMachExceptionHandler.install(rt);
#elif defined(XP_OS2)
return rt->asmJSOS2ExceptionHandler.installed() || rt->asmJSOS2ExceptionHandler.setCurrentThread();
#else
// Assume Windows or Unix. For these platforms, there is a single,
// process-wide signal handler installed. Take care to only install it once.
InstallSignalHandlersMutex::Lock lock;
if (lock.handlersInstalled())
return true;
# if defined(XP_WIN)
if (!AddVectoredExceptionHandler(/* FirstHandler = */true, AsmJSExceptionHandler))
return false;
# else // assume Unix
struct sigaction sigAction;
sigAction.sa_sigaction = &AsmJSFaultHandler;
sigemptyset(&sigAction.sa_mask);
sigAction.sa_flags = SA_SIGINFO;
if (sigaction(SIGSEGV, &sigAction, &sPrevSegvHandler))
return false;
if (sigaction(SIGBUS, &sigAction, &sPrevBusHandler))
return false;
# endif
lock.setHandlersInstalled();
#endif
return true;
}
bool
js::EnsureAsmJSSignalHandlersInstalled(JSRuntime *rt)
{
#if defined(XP_MACOSX)
// On OSX, each JSRuntime gets its own handler.
return rt->asmJSMachExceptionHandler.installed() || rt->asmJSMachExceptionHandler.install(rt);
#else
// Assume Windows or Unix. For these platforms, there is a single,
// process-wide signal handler installed. Take care to only install it once.
InstallSignalHandlersMutex::Lock lock;
if (lock.handlersInstalled())
return true;
# if defined(XP_WIN)
if (!AddVectoredExceptionHandler(/* FirstHandler = */true, AsmJSExceptionHandler))
return false;
# else // assume Unix
struct sigaction sigAction;
sigAction.sa_sigaction = &AsmJSFaultHandler;
sigemptyset(&sigAction.sa_mask);
// Note: SA_NODEFER allows us to reenter the signal handler if we crash
// while handling the signal, and fall through to the Breakpad handler
// by testing handlingSignal.
sigAction.sa_flags = SA_SIGINFO | SA_NODEFER;
if (sigaction(SIGSEGV, &sigAction, &sPrevSegvHandler))
return false;
if (sigaction(SIGBUS, &sigAction, &sPrevBusHandler))
return false;
# endif
lock.setHandlersInstalled();
#endif
return true;
}