1 //===----- lib/Support/Error.cpp - Error and associated utilities ---------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/Support/Error.h" 11 #include "llvm/ADT/Twine.h" 12 #include "llvm/Support/ErrorHandling.h" 13 #include "llvm/Support/ManagedStatic.h" 14 15 16 using namespace llvm; 17 18 namespace { 19 20 enum class ErrorErrorCode : int { 21 MultipleErrors = 1, 22 InconvertibleError 23 }; 24 25 // FIXME: This class is only here to support the transition to llvm::Error. It 26 // will be removed once this transition is complete. Clients should prefer to 27 // deal with the Error value directly, rather than converting to error_code. 28 class ErrorErrorCategory : public std::error_category { 29 public: 30 const char *name() const LLVM_NOEXCEPT override { return "Error"; } 31 32 std::string message(int condition) const override { 33 switch (static_cast<ErrorErrorCode>(condition)) { 34 case ErrorErrorCode::MultipleErrors: 35 return "Multiple errors"; 36 case ErrorErrorCode::InconvertibleError: 37 return "Inconvertible error value. An error has occurred that could " 38 "not be converted to a known std::error_code. Please file a " 39 "bug."; 40 } 41 llvm_unreachable("Unhandled error code"); 42 } 43 }; 44 45 } 46 47 static ManagedStatic<ErrorErrorCategory> ErrorErrorCat; 48 49 namespace llvm { 50 51 void ErrorInfoBase::anchor() {} 52 char ErrorInfoBase::ID = 0; 53 char ErrorList::ID = 0; 54 char ECError::ID = 0; 55 char StringError::ID = 0; 56 57 void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner) { 58 if (!E) 59 return; 60 OS << ErrorBanner; 61 handleAllErrors(std::move(E), [&](const ErrorInfoBase &EI) { 62 EI.log(OS); 63 OS << "\n"; 64 }); 65 } 66 67 68 std::error_code ErrorList::convertToErrorCode() const { 69 return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors), 70 *ErrorErrorCat); 71 } 72 73 std::error_code inconvertibleErrorCode() { 74 return std::error_code(static_cast<int>(ErrorErrorCode::InconvertibleError), 75 *ErrorErrorCat); 76 } 77 78 Error errorCodeToError(std::error_code EC) { 79 if (!EC) 80 return Error::success(); 81 return Error(llvm::make_unique<ECError>(ECError(EC))); 82 } 83 84 std::error_code errorToErrorCode(Error Err) { 85 std::error_code EC; 86 handleAllErrors(std::move(Err), [&](const ErrorInfoBase &EI) { 87 EC = EI.convertToErrorCode(); 88 }); 89 if (EC == inconvertibleErrorCode()) 90 report_fatal_error(EC.message()); 91 return EC; 92 } 93 94 StringError::StringError(const Twine &S, std::error_code EC) 95 : Msg(S.str()), EC(EC) {} 96 97 void StringError::log(raw_ostream &OS) const { OS << Msg; } 98 99 std::error_code StringError::convertToErrorCode() const { 100 return EC; 101 } 102 103 void report_fatal_error(Error Err, bool GenCrashDiag) { 104 assert(Err && "report_fatal_error called with success value"); 105 std::string ErrMsg; 106 { 107 raw_string_ostream ErrStream(ErrMsg); 108 logAllUnhandledErrors(std::move(Err), ErrStream, ""); 109 } 110 report_fatal_error(ErrMsg); 111 } 112 113 } 114