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/SmallVector.h"
11#include "llvm/ADT/StringExtras.h"
12#include "llvm/ADT/Twine.h"
13#include "llvm/Support/ErrorHandling.h"
14#include <system_error>
15
16using namespace llvm;
17
18namespace {
19
20 enum class ErrorErrorCode : int {
21 MultipleErrors = 1,
22 FileError,
23 InconvertibleError
24 };
25
26 // FIXME: This class is only here to support the transition to llvm::Error. It
27 // will be removed once this transition is complete. Clients should prefer to
28 // deal with the Error value directly, rather than converting to error_code.
29 class ErrorErrorCategory : public std::error_category {
30 public:
31 const char *name() const noexcept override { return "Error"; }
32
33 std::string message(int condition) const override {
34 switch (static_cast<ErrorErrorCode>(condition)) {
35 case ErrorErrorCode::MultipleErrors:
36 return "Multiple errors";
37 case ErrorErrorCode::InconvertibleError:
38 return "Inconvertible error value. An error has occurred that could "
39 "not be converted to a known std::error_code. Please file a "
40 "bug.";
41 case ErrorErrorCode::FileError:
42 return "A file error occurred.";
43 }
44 llvm_unreachable("Unhandled error code");
45 }
46 };
47
48}
49
50ErrorErrorCategory &getErrorErrorCat() {
51 static ErrorErrorCategory ErrorErrorCat;
52 return ErrorErrorCat;
53}
54
55namespace llvm {
56
57void ErrorInfoBase::anchor() {}
58char ErrorInfoBase::ID = 0;
59char ErrorList::ID = 0;
60void ECError::anchor() {}
61char ECError::ID = 0;
62char StringError::ID = 0;
63char FileError::ID = 0;
64
65void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner) {
66 if (!E)
67 return;
68 OS << ErrorBanner;
69 handleAllErrors(E: std::move(E), Handlers: [&](const ErrorInfoBase &EI) {
70 EI.log(OS);
71 OS << "\n";
72 });
73}
74
75/// Write all error messages (if any) in E to a string. The newline character
76/// is used to separate error messages.
77std::string toString(Error E) {
78 SmallVector<std::string, 2> Errors;
79 handleAllErrors(E: std::move(E), Handlers: [&Errors](const ErrorInfoBase &EI) {
80 Errors.push_back(Elt: EI.message());
81 });
82 return join(Begin: Errors.begin(), End: Errors.end(), Separator: "\n");
83}
84
85std::error_code ErrorList::convertToErrorCode() const {
86 return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors),
87 getErrorErrorCat());
88}
89
90std::error_code inconvertibleErrorCode() {
91 return std::error_code(static_cast<int>(ErrorErrorCode::InconvertibleError),
92 getErrorErrorCat());
93}
94
95std::error_code FileError::convertToErrorCode() const {
96 std::error_code NestedEC = Err->convertToErrorCode();
97 if (NestedEC == inconvertibleErrorCode())
98 return std::error_code(static_cast<int>(ErrorErrorCode::FileError),
99 getErrorErrorCat());
100 return NestedEC;
101}
102
103Error errorCodeToError(std::error_code EC) {
104 if (!EC)
105 return Error::success();
106 return Error(std::make_unique<ECError>(args: ECError(EC)));
107}
108
109std::error_code errorToErrorCode(Error Err) {
110 std::error_code EC;
111 handleAllErrors(E: std::move(Err), Handlers: [&](const ErrorInfoBase &EI) {
112 EC = EI.convertToErrorCode();
113 });
114 if (EC == inconvertibleErrorCode())
115 report_fatal_error(reason: Twine(EC.message()));
116 return EC;
117}
118
119#if LLVM_ENABLE_ABI_BREAKING_CHECKS
120void Error::fatalUncheckedError() const {
121 dbgs() << "Program aborted due to an unhandled Error:\n";
122 if (getPtr()) {
123 getPtr()->log(OS&: dbgs());
124 dbgs() << "\n";
125 }else
126 dbgs() << "Error value was Success. (Note: Success values must still be "
127 "checked prior to being destroyed).\n";
128 abort();
129}
130#endif
131
132StringError::StringError(std::error_code EC, const Twine &S)
133 : Msg(S.str()), EC(EC) {}
134
135StringError::StringError(const Twine &S, std::error_code EC)
136 : Msg(S.str()), EC(EC), PrintMsgOnly(true) {}
137
138void StringError::log(raw_ostream &OS) const {
139 if (PrintMsgOnly) {
140 OS << Msg;
141 } else {
142 OS << EC.message();
143 if (!Msg.empty())
144 OS << (" " + Msg);
145 }
146}
147
148std::error_code StringError::convertToErrorCode() const {
149 return EC;
150}
151
152Error createStringError(std::error_code EC, char const *Msg) {
153 return make_error<StringError>(Args&: Msg, Args&: EC);
154}
155
156void report_fatal_error(Error Err, bool GenCrashDiag) {
157 assert(Err && "report_fatal_error called with success value");
158 std::string ErrMsg;
159 {
160 raw_string_ostream ErrStream(ErrMsg);
161 logAllUnhandledErrors(E: std::move(Err), OS&: ErrStream);
162 }
163 report_fatal_error(reason: Twine(ErrMsg), gen_crash_diag: GenCrashDiag);
164}
165
166} // end namespace llvm
167
168LLVMErrorTypeId LLVMGetErrorTypeId(LLVMErrorRef Err) {
169 return reinterpret_cast<ErrorInfoBase *>(Err)->dynamicClassID();
170}
171
172void LLVMConsumeError(LLVMErrorRef Err) { consumeError(Err: unwrap(ErrRef: Err)); }
173
174char *LLVMGetErrorMessage(LLVMErrorRef Err) {
175 std::string Tmp = toString(E: unwrap(ErrRef: Err));
176 char *ErrMsg = new char[Tmp.size() + 1];
177 memcpy(dest: ErrMsg, src: Tmp.data(), n: Tmp.size());
178 ErrMsg[Tmp.size()] = '\0';
179 return ErrMsg;
180}
181
182void LLVMDisposeErrorMessage(char *ErrMsg) { delete[] ErrMsg; }
183
184LLVMErrorTypeId LLVMGetStringErrorTypeId() {
185 return reinterpret_cast<void *>(&StringError::ID);
186}
187
188LLVMErrorRef LLVMCreateStringError(const char *ErrMsg) {
189 return wrap(Err: make_error<StringError>(Args&: ErrMsg, Args: inconvertibleErrorCode()));
190}
191

source code of llvm/lib/Support/Error.cpp