1 //===- Error.h - system_error extensions for lld ----------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This declares a new error_category for the lld library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLD_CORE_ERROR_H 14 #define LLD_CORE_ERROR_H 15 16 #include "lld/Common/LLVM.h" 17 #include "llvm/ADT/Twine.h" 18 #include "llvm/Support/Error.h" 19 #include <system_error> 20 21 namespace lld { 22 23 const std::error_category &YamlReaderCategory(); 24 25 enum class YamlReaderError { 26 unknown_keyword, 27 illegal_value 28 }; 29 make_error_code(YamlReaderError e)30inline std::error_code make_error_code(YamlReaderError e) { 31 return std::error_code(static_cast<int>(e), YamlReaderCategory()); 32 } 33 34 /// Creates an error_code object that has associated with it an arbitrary 35 /// error message. The value() of the error_code will always be non-zero 36 /// but its value is meaningless. The message() will be (a copy of) the 37 /// supplied error string. 38 /// Note: Once ErrorOr<> is updated to work with errors other than error_code, 39 /// this can be updated to return some other kind of error. 40 std::error_code make_dynamic_error_code(StringRef msg); 41 42 /// Generic error. 43 /// 44 /// For errors that don't require their own specific sub-error (most errors) 45 /// this class can be used to describe the error via a string message. 46 class GenericError : public llvm::ErrorInfo<GenericError> { 47 public: 48 static char ID; 49 GenericError(Twine Msg); getMessage()50 const std::string &getMessage() const { return Msg; } 51 void log(llvm::raw_ostream &OS) const override; 52 convertToErrorCode()53 std::error_code convertToErrorCode() const override { 54 return make_dynamic_error_code(getMessage()); 55 } 56 57 private: 58 std::string Msg; 59 }; 60 61 } // end namespace lld 62 63 namespace std { 64 template <> struct is_error_code_enum<lld::YamlReaderError> : std::true_type {}; 65 } 66 67 #endif 68