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:
name() const30 const char *name() const LLVM_NOEXCEPT override { return "Error"; }
31
message(int condition) const32 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
anchor()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
logAllUnhandledErrors(Error E,raw_ostream & OS,Twine ErrorBanner)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
convertToErrorCode() const68 std::error_code ErrorList::convertToErrorCode() const {
69 return std::error_code(static_cast<int>(ErrorErrorCode::MultipleErrors),
70 *ErrorErrorCat);
71 }
72
inconvertibleErrorCode()73 std::error_code inconvertibleErrorCode() {
74 return std::error_code(static_cast<int>(ErrorErrorCode::InconvertibleError),
75 *ErrorErrorCat);
76 }
77
errorCodeToError(std::error_code EC)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
errorToErrorCode(Error Err)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
StringError(const Twine & S,std::error_code EC)94 StringError::StringError(const Twine &S, std::error_code EC)
95 : Msg(S.str()), EC(EC) {}
96
log(raw_ostream & OS) const97 void StringError::log(raw_ostream &OS) const { OS << Msg; }
98
convertToErrorCode() const99 std::error_code StringError::convertToErrorCode() const {
100 return EC;
101 }
102
report_fatal_error(Error Err,bool GenCrashDiag)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