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5083fc5573
StringError can be used to represent Errors that aren't recoverable based on the error type, but that have a useful error message that can be reported to the user or logged. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270948 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
//===----- lib/Support/Error.cpp - Error and associated utilities ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Error.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ManagedStatic.h"
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using namespace llvm;
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namespace {
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enum class ErrorErrorCode : int {
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MultipleErrors = 1,
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UnconvertibleError
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};
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// FIXME: This class is only here to support the transition to llvm::Error. It
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// will be removed once this transition is complete. Clients should prefer to
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// deal with the Error value directly, rather than converting to error_code.
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class ErrorErrorCategory : public std::error_category {
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public:
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const char *name() const LLVM_NOEXCEPT override { return "Error"; }
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std::string message(int condition) const override {
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switch (static_cast<ErrorErrorCode>(condition)) {
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case ErrorErrorCode::MultipleErrors:
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return "Multiple errors";
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case ErrorErrorCode::UnconvertibleError:
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return "Unconvertible error value. An error has occurred that could "
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"not be converted to a known std::error_code. Please file a "
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"bug.";
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}
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llvm_unreachable("Unhandled error code");
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}
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};
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}
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static ManagedStatic<ErrorErrorCategory> ErrorErrorCat;
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namespace llvm {
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void ErrorInfoBase::anchor() {}
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char ErrorInfoBase::ID = 0;
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char ErrorList::ID = 0;
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char ECError::ID = 0;
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char StringError::ID = 0;
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std::error_code ErrorList::convertToErrorCode() const {
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return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors),
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*ErrorErrorCat);
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}
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std::error_code unconvertibleErrorCode() {
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return std::error_code(static_cast<int>(ErrorErrorCode::UnconvertibleError),
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*ErrorErrorCat);
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}
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Error errorCodeToError(std::error_code EC) {
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if (!EC)
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return Error::success();
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return Error(llvm::make_unique<ECError>(ECError(EC)));
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}
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std::error_code errorToErrorCode(Error Err) {
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std::error_code EC;
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handleAllErrors(std::move(Err), [&](const ErrorInfoBase &EI) {
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EC = EI.convertToErrorCode();
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});
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if (EC == unconvertibleErrorCode())
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report_fatal_error(EC.message());
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return EC;
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}
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StringError::StringError(const Twine &S, std::error_code EC)
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: Msg(S.str()), EC(EC) {}
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void StringError::log(raw_ostream &OS) const { OS << Msg; }
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std::error_code StringError::convertToErrorCode() const {
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return EC;
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}
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}
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