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//===----- lib/Support/Error.cpp - Error and associated utilities ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Error.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include <system_error>
using namespace llvm;
namespace {
enum class ErrorErrorCode : int {
MultipleErrors = 1,
FileError,
InconvertibleError
};
// FIXME: This class is only here to support the transition to llvm::Error. It
// will be removed once this transition is complete. Clients should prefer to
// deal with the Error value directly, rather than converting to error_code.
class ErrorErrorCategory : public std::error_category {
public:
const char *name() const noexcept override { return "Error"; }
std::string message(int condition) const override {
switch (static_cast<ErrorErrorCode>(condition)) {
case ErrorErrorCode::MultipleErrors:
return "Multiple errors";
case ErrorErrorCode::InconvertibleError:
return "Inconvertible error value. An error has occurred that could "
"not be converted to a known std::error_code. Please file a "
"bug.";
case ErrorErrorCode::FileError:
return "A file error occurred.";
}
llvm_unreachable("Unhandled error code");
}
};
}
static ManagedStatic<ErrorErrorCategory> ErrorErrorCat;
namespace llvm {
void ErrorInfoBase::anchor() {}
char ErrorInfoBase::ID = 0;
char ErrorList::ID = 0;
void ECError::anchor() {}
char ECError::ID = 0;
char StringError::ID = 0;
char FileError::ID = 0;
void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner) {
if (!E)
return;
OS << ErrorBanner;
handleAllErrors(std::move(E), [&](const ErrorInfoBase &EI) {
EI.log(OS);
OS << "\n";
});
}
std::error_code ErrorList::convertToErrorCode() const {
return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors),
*ErrorErrorCat);
}
std::error_code inconvertibleErrorCode() {
return std::error_code(static_cast<int>(ErrorErrorCode::InconvertibleError),
*ErrorErrorCat);
}
std::error_code FileError::convertToErrorCode() const {
return std::error_code(static_cast<int>(ErrorErrorCode::FileError),
*ErrorErrorCat);
}
Error errorCodeToError(std::error_code EC) {
if (!EC)
return Error::success();
return Error(std::make_unique<ECError>(ECError(EC)));
}
std::error_code errorToErrorCode(Error Err) {
std::error_code EC;
handleAllErrors(std::move(Err), [&](const ErrorInfoBase &EI) {
EC = EI.convertToErrorCode();
});
if (EC == inconvertibleErrorCode())
report_fatal_error(EC.message());
return EC;
}
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
void Error::fatalUncheckedError() const {
dbgs() << "Program aborted due to an unhandled Error:\n";
if (getPtr()) {
getPtr()->log(dbgs());
dbgs() << "\n";
}else
dbgs() << "Error value was Success. (Note: Success values must still be "
"checked prior to being destroyed).\n";
abort();
}
#endif
StringError::StringError(std::error_code EC, const Twine &S)
: Msg(S.str()), EC(EC) {}
StringError::StringError(const Twine &S, std::error_code EC)
: Msg(S.str()), EC(EC), PrintMsgOnly(true) {}
void StringError::log(raw_ostream &OS) const {
if (PrintMsgOnly) {
OS << Msg;
} else {
OS << EC.message();
if (!Msg.empty())
OS << (" " + Msg);
}
}
std::error_code StringError::convertToErrorCode() const {
return EC;
}
Error createStringError(std::error_code EC, char const *Msg) {
return make_error<StringError>(Msg, EC);
}
void report_fatal_error(Error Err, bool GenCrashDiag) {
assert(Err && "report_fatal_error called with success value");
std::string ErrMsg;
{
raw_string_ostream ErrStream(ErrMsg);
logAllUnhandledErrors(std::move(Err), ErrStream);
}
report_fatal_error(ErrMsg);
}
} // end namespace llvm
LLVMErrorTypeId LLVMGetErrorTypeId(LLVMErrorRef Err) {
return reinterpret_cast<ErrorInfoBase *>(Err)->dynamicClassID();
}
void LLVMConsumeError(LLVMErrorRef Err) { consumeError(unwrap(Err)); }
char *LLVMGetErrorMessage(LLVMErrorRef Err) {
std::string Tmp = toString(unwrap(Err));
char *ErrMsg = new char[Tmp.size() + 1];
memcpy(ErrMsg, Tmp.data(), Tmp.size());
ErrMsg[Tmp.size()] = '\0';
return ErrMsg;
}
void LLVMDisposeErrorMessage(char *ErrMsg) { delete[] ErrMsg; }
LLVMErrorTypeId LLVMGetStringErrorTypeId() {
return reinterpret_cast<void *>(&StringError::ID);
}
LLVMErrorRef LLVMCreateStringError(const char *ErrMsg) {
return wrap(make_error<StringError>(ErrMsg, inconvertibleErrorCode()));
}
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