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annotate lib/Support/ErrorHandling.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===- lib/Support/ErrorHandling.cpp - Callbacks for errors ---------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines an API used to indicate fatal error conditions. Non-fatal
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11 // errors (most of them) should be handled through LLVMContext.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Support/ErrorHandling.h"
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16 #include "llvm/ADT/SmallVector.h"
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17 #include "llvm/ADT/Twine.h"
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18 #include "llvm/Config/config.h"
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19 #include "llvm/Support/Debug.h"
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20 #include "llvm/Support/Signals.h"
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21 #include "llvm/Support/Threading.h"
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22 #include "llvm/Support/raw_ostream.h"
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23 #include "llvm-c/Core.h"
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24 #include <cassert>
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25 #include <cstdlib>
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26
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27 #if defined(HAVE_UNISTD_H)
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28 # include <unistd.h>
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29 #endif
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30 #if defined(_MSC_VER)
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31 # include <io.h>
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32 # include <fcntl.h>
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33 #endif
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34
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35 using namespace llvm;
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36
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37 static fatal_error_handler_t ErrorHandler = 0;
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38 static void *ErrorHandlerUserData = 0;
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39
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40 void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
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41 void *user_data) {
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42 assert(!llvm_is_multithreaded() &&
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43 "Cannot register error handlers after starting multithreaded mode!\n");
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44 assert(!ErrorHandler && "Error handler already registered!\n");
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45 ErrorHandler = handler;
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46 ErrorHandlerUserData = user_data;
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47 }
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48
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49 void llvm::remove_fatal_error_handler() {
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50 ErrorHandler = 0;
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51 }
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52
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53 void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
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54 report_fatal_error(Twine(Reason), GenCrashDiag);
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55 }
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56
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57 void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
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58 report_fatal_error(Twine(Reason), GenCrashDiag);
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59 }
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60
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61 void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
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62 report_fatal_error(Twine(Reason), GenCrashDiag);
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63 }
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64
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65 void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
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66 if (ErrorHandler) {
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67 ErrorHandler(ErrorHandlerUserData, Reason.str(), GenCrashDiag);
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68 } else {
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69 // Blast the result out to stderr. We don't try hard to make sure this
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70 // succeeds (e.g. handling EINTR) and we can't use errs() here because
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71 // raw ostreams can call report_fatal_error.
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72 SmallVector<char, 64> Buffer;
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73 raw_svector_ostream OS(Buffer);
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74 OS << "LLVM ERROR: " << Reason << "\n";
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75 StringRef MessageStr = OS.str();
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76 ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
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77 (void)written; // If something went wrong, we deliberately just give up.
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78 }
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79
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80 // If we reached here, we are failing ungracefully. Run the interrupt handlers
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81 // to make sure any special cleanups get done, in particular that we remove
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82 // files registered with RemoveFileOnSignal.
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83 sys::RunInterruptHandlers();
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84
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85 exit(1);
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86 }
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87
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88 void llvm::llvm_unreachable_internal(const char *msg, const char *file,
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89 unsigned line) {
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90 // This code intentionally doesn't call the ErrorHandler callback, because
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91 // llvm_unreachable is intended to be used to indicate "impossible"
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92 // situations, and not legitimate runtime errors.
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93 if (msg)
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94 dbgs() << msg << "\n";
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95 dbgs() << "UNREACHABLE executed";
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96 if (file)
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97 dbgs() << " at " << file << ":" << line;
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98 dbgs() << "!\n";
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99 abort();
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100 #ifdef LLVM_BUILTIN_UNREACHABLE
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101 // Windows systems and possibly others don't declare abort() to be noreturn,
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102 // so use the unreachable builtin to avoid a Clang self-host warning.
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103 LLVM_BUILTIN_UNREACHABLE;
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104 #endif
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105 }
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106
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107 static void bindingsErrorHandler(void *user_data, const std::string& reason,
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108 bool gen_crash_diag) {
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109 LLVMFatalErrorHandler handler =
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110 LLVM_EXTENSION reinterpret_cast<LLVMFatalErrorHandler>(user_data);
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111 handler(reason.c_str());
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112 }
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113
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114 void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
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115 install_fatal_error_handler(bindingsErrorHandler,
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116 LLVM_EXTENSION reinterpret_cast<void *>(Handler));
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117 }
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118
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119 void LLVMResetFatalErrorHandler() {
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120 remove_fatal_error_handler();
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121 }