osb/source/core/StarException_unix.cpp

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#include "StarException.hpp"
#include "StarCasting.hpp"
#include "StarLogging.hpp"
#include <execinfo.h>
#include <cstdlib>
namespace Star {
static size_t const StackLimit = 256;
typedef pair<Array<void*, StackLimit>, size_t> StackCapture;
inline StackCapture captureStack() {
StackCapture stackCapture;
stackCapture.second = backtrace(stackCapture.first.ptr(), StackLimit);
return stackCapture;
}
OutputProxy outputStack(StackCapture stack) {
return OutputProxy([stack = move(stack)](std::ostream & os) {
char** symbols = backtrace_symbols(stack.first.ptr(), stack.second);
for (size_t i = 0; i < stack.second; ++i) {
os << symbols[i];
if (i + 1 < stack.second)
os << std::endl;
}
if (stack.second == StackLimit)
os << std::endl << "[Stack Output Limit Reached]";
::free(symbols);
});
}
StarException::StarException() noexcept
: StarException(std::string("StarException")) {}
StarException::~StarException() noexcept {}
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StarException::StarException(std::string message, bool genStackTrace) noexcept
: StarException("StarException", move(message), genStackTrace) {}
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StarException::StarException(std::exception const& cause) noexcept
: StarException("StarException", std::string(), cause) {}
StarException::StarException(std::string message, std::exception const& cause) noexcept
: StarException("StarException", move(message), cause) {}
const char* StarException::what() const throw() {
if (m_whatBuffer.empty()) {
std::ostringstream os;
m_printException(os, false);
m_whatBuffer = os.str();
}
return m_whatBuffer.c_str();
}
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StarException::StarException(char const* type, std::string message, bool genStackTrace) noexcept {
auto printException = [](std::ostream& os, bool fullStacktrace, char const* type, std::string message, Maybe<StackCapture> stack) {
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os << "(" << type << ")";
if (!message.empty())
os << " " << message;
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if (fullStacktrace && stack) {
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os << std::endl;
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os << outputStack(*stack);
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}
};
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m_printException = bind(printException, _1, _2, type, move(message), genStackTrace ? captureStack() : Maybe<StackCapture>());
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}
StarException::StarException(char const* type, std::string message, std::exception const& cause) noexcept
: StarException(type, move(message)) {
auto printException = [](std::ostream& os, bool fullStacktrace, function<void(std::ostream&, bool)> self, function<void(std::ostream&, bool)> cause) {
self(os, fullStacktrace);
os << std::endl << "Caused by: ";
cause(os, fullStacktrace);
};
std::function<void(std::ostream&, bool)> printCause;
if (auto starException = as<StarException>(&cause)) {
printCause = bind(starException->m_printException, _1, _2);
} else {
printCause = bind([](std::ostream& os, bool, std::string causeWhat) {
os << "std::exception: " << causeWhat;
}, _1, _2, std::string(cause.what()));
}
m_printException = bind(printException, _1, _2, m_printException, move(printCause));
}
std::string printException(std::exception const& e, bool fullStacktrace) {
std::ostringstream os;
printException(os, e, fullStacktrace);
return os.str();
}
void printException(std::ostream& os, std::exception const& e, bool fullStacktrace) {
if (auto starException = as<StarException>(&e))
starException->m_printException(os, fullStacktrace);
else
os << "std::exception: " << e.what();
}
OutputProxy outputException(std::exception const& e, bool fullStacktrace) {
if (auto starException = as<StarException>(&e))
return OutputProxy(bind(starException->m_printException, _1, fullStacktrace));
else
return OutputProxy(bind([](std::ostream& os, std::string what) { os << "std::exception: " << what; }, _1, std::string(e.what())));
}
void printStack(char const* message) {
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Logger::info("Stack Trace ({})...\n{}", message, outputStack(captureStack()));
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}
void fatalError(char const* message, bool showStackTrace) {
if (showStackTrace)
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Logger::error("Fatal Error: {}\n{}", message, outputStack(captureStack()));
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else
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Logger::error("Fatal Error: {}", message);
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std::abort();
}
void fatalException(std::exception const& e, bool showStackTrace) {
if (showStackTrace)
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Logger::error("Fatal Exception caught: {}\nCaught at:\n{}", outputException(e, true), outputStack(captureStack()));
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else
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Logger::error("Fatal Exception caught: {}", outputException(e, showStackTrace));
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std::abort();
}
}