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comparison llvm/lib/Support/Error.cpp @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 2e18cbf3894f
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147:c2174574ed3a 150:1d019706d866
1 //===----- lib/Support/Error.cpp - Error and associated utilities ---------===//
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 #include "llvm/Support/Error.h"
10 #include "llvm/ADT/Twine.h"
11 #include "llvm/Support/ErrorHandling.h"
12 #include "llvm/Support/ManagedStatic.h"
13 #include <system_error>
14
15 using namespace llvm;
16
17 namespace {
18
19 enum class ErrorErrorCode : int {
20 MultipleErrors = 1,
21 FileError,
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 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 case ErrorErrorCode::FileError:
41 return "A file error occurred.";
42 }
43 llvm_unreachable("Unhandled error code");
44 }
45 };
46
47 }
48
49 static ManagedStatic<ErrorErrorCategory> ErrorErrorCat;
50
51 namespace llvm {
52
53 void ErrorInfoBase::anchor() {}
54 char ErrorInfoBase::ID = 0;
55 char ErrorList::ID = 0;
56 void ECError::anchor() {}
57 char ECError::ID = 0;
58 char StringError::ID = 0;
59 char FileError::ID = 0;
60
61 void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner) {
62 if (!E)
63 return;
64 OS << ErrorBanner;
65 handleAllErrors(std::move(E), [&](const ErrorInfoBase &EI) {
66 EI.log(OS);
67 OS << "\n";
68 });
69 }
70
71
72 std::error_code ErrorList::convertToErrorCode() const {
73 return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors),
74 *ErrorErrorCat);
75 }
76
77 std::error_code inconvertibleErrorCode() {
78 return std::error_code(static_cast<int>(ErrorErrorCode::InconvertibleError),
79 *ErrorErrorCat);
80 }
81
82 std::error_code FileError::convertToErrorCode() const {
83 return std::error_code(static_cast<int>(ErrorErrorCode::FileError),
84 *ErrorErrorCat);
85 }
86
87 Error errorCodeToError(std::error_code EC) {
88 if (!EC)
89 return Error::success();
90 return Error(std::make_unique<ECError>(ECError(EC)));
91 }
92
93 std::error_code errorToErrorCode(Error Err) {
94 std::error_code EC;
95 handleAllErrors(std::move(Err), [&](const ErrorInfoBase &EI) {
96 EC = EI.convertToErrorCode();
97 });
98 if (EC == inconvertibleErrorCode())
99 report_fatal_error(EC.message());
100 return EC;
101 }
102
103 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
104 void Error::fatalUncheckedError() const {
105 dbgs() << "Program aborted due to an unhandled Error:\n";
106 if (getPtr()) {
107 getPtr()->log(dbgs());
108 dbgs() << "\n";
109 }else
110 dbgs() << "Error value was Success. (Note: Success values must still be "
111 "checked prior to being destroyed).\n";
112 abort();
113 }
114 #endif
115
116 StringError::StringError(std::error_code EC, const Twine &S)
117 : Msg(S.str()), EC(EC) {}
118
119 StringError::StringError(const Twine &S, std::error_code EC)
120 : Msg(S.str()), EC(EC), PrintMsgOnly(true) {}
121
122 void StringError::log(raw_ostream &OS) const {
123 if (PrintMsgOnly) {
124 OS << Msg;
125 } else {
126 OS << EC.message();
127 if (!Msg.empty())
128 OS << (" " + Msg);
129 }
130 }
131
132 std::error_code StringError::convertToErrorCode() const {
133 return EC;
134 }
135
136 Error createStringError(std::error_code EC, char const *Msg) {
137 return make_error<StringError>(Msg, EC);
138 }
139
140 void report_fatal_error(Error Err, bool GenCrashDiag) {
141 assert(Err && "report_fatal_error called with success value");
142 std::string ErrMsg;
143 {
144 raw_string_ostream ErrStream(ErrMsg);
145 logAllUnhandledErrors(std::move(Err), ErrStream);
146 }
147 report_fatal_error(ErrMsg);
148 }
149
150 } // end namespace llvm
151
152 LLVMErrorTypeId LLVMGetErrorTypeId(LLVMErrorRef Err) {
153 return reinterpret_cast<ErrorInfoBase *>(Err)->dynamicClassID();
154 }
155
156 void LLVMConsumeError(LLVMErrorRef Err) { consumeError(unwrap(Err)); }
157
158 char *LLVMGetErrorMessage(LLVMErrorRef Err) {
159 std::string Tmp = toString(unwrap(Err));
160 char *ErrMsg = new char[Tmp.size() + 1];
161 memcpy(ErrMsg, Tmp.data(), Tmp.size());
162 ErrMsg[Tmp.size()] = '\0';
163 return ErrMsg;
164 }
165
166 void LLVMDisposeErrorMessage(char *ErrMsg) { delete[] ErrMsg; }
167
168 LLVMErrorTypeId LLVMGetStringErrorTypeId() {
169 return reinterpret_cast<void *>(&StringError::ID);
170 }