1 //===- Error.h - system_error extensions for lld ----------------*- C++ -*-===// 2 // 3 // The LLVM Linker 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This declares a new error_category for the lld library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLD_CORE_ERROR_H 15 #define LLD_CORE_ERROR_H 16 17 #include "lld/Core/LLVM.h" 18 #include "llvm/ADT/Twine.h" 19 #include "llvm/Support/Error.h" 20 #include <system_error> 21 22 namespace lld { 23 24 const std::error_category &YamlReaderCategory(); 25 26 enum class YamlReaderError { 27 unknown_keyword, 28 illegal_value 29 }; 30 31 inline std::error_code make_error_code(YamlReaderError e) { 32 return std::error_code(static_cast<int>(e), YamlReaderCategory()); 33 } 34 35 /// Creates an error_code object that has associated with it an arbitrary 36 /// error messsage. The value() of the error_code will always be non-zero 37 /// but its value is meaningless. The messsage() will be (a copy of) the 38 /// supplied error string. 39 /// Note: Once ErrorOr<> is updated to work with errors other than error_code, 40 /// this can be updated to return some other kind of error. 41 std::error_code make_dynamic_error_code(StringRef msg); 42 43 /// Generic error. 44 /// 45 /// For errors that don't require their own specific sub-error (most errors) 46 /// this class can be used to describe the error via a string message. 47 class GenericError : public llvm::ErrorInfo<GenericError> { 48 public: 49 static char ID; 50 GenericError(Twine Msg); 51 const std::string &getMessage() const { return Msg; } 52 void log(llvm::raw_ostream &OS) const override; 53 54 std::error_code convertToErrorCode() const override { 55 return make_dynamic_error_code(getMessage()); 56 } 57 58 private: 59 std::string Msg; 60 }; 61 62 } // end namespace lld 63 64 namespace std { 65 template <> struct is_error_code_enum<lld::YamlReaderError> : std::true_type {}; 66 } 67 68 #endif 69
