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/*
* Created by Phil on 21/08/2014
* Copyright 2014 Two Blue Cubes Ltd. All rights reserved.
*
* Distributed under the Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*
*/
#include "catch_fatal_condition.h"
#include "catch_context.h"
#include "catch_interfaces_capture.h"
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wmissing-field-initializers"
#endif
#if defined( CATCH_CONFIG_WINDOWS_SEH ) || defined( CATCH_CONFIG_POSIX_SIGNALS )
namespace {
// Report the error condition
void reportFatal( char const * const message ) {
Catch::getCurrentContext().getResultCapture()->handleFatalErrorCondition( message );
}
}
#endif // signals/SEH handling
#if defined( CATCH_CONFIG_WINDOWS_SEH )
namespace Catch {
struct SignalDefs { DWORD id; const char* name; };
// There is no 1-1 mapping between signals and windows exceptions.
// Windows can easily distinguish between SO and SigSegV,
// but SigInt, SigTerm, etc are handled differently.
static SignalDefs signalDefs[] = {
{ EXCEPTION_ILLEGAL_INSTRUCTION, "SIGILL - Illegal instruction signal" },
{ EXCEPTION_STACK_OVERFLOW, "SIGSEGV - Stack overflow" },
{ EXCEPTION_ACCESS_VIOLATION, "SIGSEGV - Segmentation violation signal" },
{ EXCEPTION_INT_DIVIDE_BY_ZERO, "Divide by zero error" },
};
LONG CALLBACK FatalConditionHandler::handleVectoredException(PEXCEPTION_POINTERS ExceptionInfo) {
for (auto const& def : signalDefs) {
if (ExceptionInfo->ExceptionRecord->ExceptionCode == def.id) {
reportFatal(def.name);
}
}
// If its not an exception we care about, pass it along.
// This stops us from eating debugger breaks etc.
return EXCEPTION_CONTINUE_SEARCH;
}
FatalConditionHandler::FatalConditionHandler() {
isSet = true;
// 32k seems enough for Catch to handle stack overflow,
// but the value was found experimentally, so there is no strong guarantee
guaranteeSize = 32 * 1024;
exceptionHandlerHandle = nullptr;
// Register as first handler in current chain
exceptionHandlerHandle = AddVectoredExceptionHandler(1, handleVectoredException);
// Pass in guarantee size to be filled
SetThreadStackGuarantee(&guaranteeSize);
}
void FatalConditionHandler::reset() {
if (isSet) {
RemoveVectoredExceptionHandler(exceptionHandlerHandle);
SetThreadStackGuarantee(&guaranteeSize);
exceptionHandlerHandle = nullptr;
isSet = false;
}
}
FatalConditionHandler::~FatalConditionHandler() {
reset();
}
bool FatalConditionHandler::isSet = false;
ULONG FatalConditionHandler::guaranteeSize = 0;
PVOID FatalConditionHandler::exceptionHandlerHandle = nullptr;
} // namespace Catch
#elif defined( CATCH_CONFIG_POSIX_SIGNALS )
namespace Catch {
struct SignalDefs {
int id;
const char* name;
};
// 32kb for the alternate stack seems to be sufficient. However, this value
// is experimentally determined, so that's not guaranteed.
constexpr static std::size_t sigStackSize = 32768 >= MINSIGSTKSZ ? 32768 : MINSIGSTKSZ;
static SignalDefs signalDefs[] = {
{ SIGINT, "SIGINT - Terminal interrupt signal" },
{ SIGILL, "SIGILL - Illegal instruction signal" },
{ SIGFPE, "SIGFPE - Floating point error signal" },
{ SIGSEGV, "SIGSEGV - Segmentation violation signal" },
{ SIGTERM, "SIGTERM - Termination request signal" },
{ SIGABRT, "SIGABRT - Abort (abnormal termination) signal" }
};
void FatalConditionHandler::handleSignal( int sig ) {
char const * name = "<unknown signal>";
for (auto const& def : signalDefs) {
if (sig == def.id) {
name = def.name;
break;
}
}
reset();
reportFatal(name);
raise( sig );
}
FatalConditionHandler::FatalConditionHandler() {
isSet = true;
stack_t sigStack;
sigStack.ss_sp = altStackMem;
sigStack.ss_size = sigStackSize;
sigStack.ss_flags = 0;
sigaltstack(&sigStack, &oldSigStack);
struct sigaction sa = { };
sa.sa_handler = handleSignal;
sa.sa_flags = SA_ONSTACK;
for (std::size_t i = 0; i < sizeof(signalDefs)/sizeof(SignalDefs); ++i) {
sigaction(signalDefs[i].id, &sa, &oldSigActions[i]);
}
}
FatalConditionHandler::~FatalConditionHandler() {
reset();
}
void FatalConditionHandler::reset() {
if( isSet ) {
// Set signals back to previous values -- hopefully nobody overwrote them in the meantime
for( std::size_t i = 0; i < sizeof(signalDefs)/sizeof(SignalDefs); ++i ) {
sigaction(signalDefs[i].id, &oldSigActions[i], nullptr);
}
// Return the old stack
sigaltstack(&oldSigStack, nullptr);
isSet = false;
}
}
bool FatalConditionHandler::isSet = false;
struct sigaction FatalConditionHandler::oldSigActions[sizeof(signalDefs)/sizeof(SignalDefs)] = {};
stack_t FatalConditionHandler::oldSigStack = {};
char FatalConditionHandler::altStackMem[sigStackSize] = {};
} // namespace Catch
#else
namespace Catch {
void FatalConditionHandler::reset() {}
}
#endif // signals/SEH handling
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
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