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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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100
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16 #include "llvm-c/ErrorHandling.h"
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17 #include "llvm/ADT/SmallVector.h"
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18 #include "llvm/ADT/Twine.h"
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19 #include "llvm/Config/config.h"
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20 #include "llvm/Support/Debug.h"
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77
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21 #include "llvm/Support/Errc.h"
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120
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22 #include "llvm/Support/Error.h"
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83
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23 #include "llvm/Support/Signals.h"
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24 #include "llvm/Support/Threading.h"
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77
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25 #include "llvm/Support/WindowsError.h"
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26 #include "llvm/Support/raw_ostream.h"
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27 #include <cassert>
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28 #include <cstdlib>
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121
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29 #include <mutex>
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30 #include <new>
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31
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32 #if defined(HAVE_UNISTD_H)
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33 # include <unistd.h>
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34 #endif
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35 #if defined(_MSC_VER)
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36 # include <io.h>
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37 # include <fcntl.h>
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38 #endif
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39
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40 using namespace llvm;
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41
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77
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42 static fatal_error_handler_t ErrorHandler = nullptr;
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43 static void *ErrorHandlerUserData = nullptr;
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44
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121
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45 static fatal_error_handler_t BadAllocErrorHandler = nullptr;
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46 static void *BadAllocErrorHandlerUserData = nullptr;
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47
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48 #if LLVM_ENABLE_THREADS == 1
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49 // Mutexes to synchronize installing error handlers and calling error handlers.
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50 // Do not use ManagedStatic, or that may allocate memory while attempting to
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51 // report an OOM.
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52 //
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53 // This usage of std::mutex has to be conditionalized behind ifdefs because
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54 // of this script:
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55 // compiler-rt/lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh
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56 // That script attempts to statically link the LLVM symbolizer library with the
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57 // STL and hide all of its symbols with 'opt -internalize'. To reduce size, it
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58 // cuts out the threading portions of the hermetic copy of libc++ that it
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59 // builds. We can remove these ifdefs if that script goes away.
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60 static std::mutex ErrorHandlerMutex;
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61 static std::mutex BadAllocErrorHandlerMutex;
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62 #endif
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63
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64 void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
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65 void *user_data) {
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121
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66 #if LLVM_ENABLE_THREADS == 1
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67 std::lock_guard<std::mutex> Lock(ErrorHandlerMutex);
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68 #endif
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69 assert(!ErrorHandler && "Error handler already registered!\n");
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70 ErrorHandler = handler;
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71 ErrorHandlerUserData = user_data;
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72 }
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73
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74 void llvm::remove_fatal_error_handler() {
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121
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75 #if LLVM_ENABLE_THREADS == 1
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76 std::lock_guard<std::mutex> Lock(ErrorHandlerMutex);
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77 #endif
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77
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78 ErrorHandler = nullptr;
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79 ErrorHandlerUserData = nullptr;
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80 }
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81
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82 void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
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83 report_fatal_error(Twine(Reason), GenCrashDiag);
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84 }
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85
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86 void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
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87 report_fatal_error(Twine(Reason), GenCrashDiag);
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88 }
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89
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90 void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
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91 report_fatal_error(Twine(Reason), GenCrashDiag);
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92 }
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93
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94 void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
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77
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95 llvm::fatal_error_handler_t handler = nullptr;
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96 void* handlerData = nullptr;
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97 {
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98 // Only acquire the mutex while reading the handler, so as not to invoke a
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99 // user-supplied callback under a lock.
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121
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100 #if LLVM_ENABLE_THREADS == 1
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101 std::lock_guard<std::mutex> Lock(ErrorHandlerMutex);
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102 #endif
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77
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103 handler = ErrorHandler;
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104 handlerData = ErrorHandlerUserData;
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105 }
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106
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107 if (handler) {
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108 handler(handlerData, Reason.str(), GenCrashDiag);
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109 } else {
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110 // Blast the result out to stderr. We don't try hard to make sure this
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111 // succeeds (e.g. handling EINTR) and we can't use errs() here because
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112 // raw ostreams can call report_fatal_error.
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113 SmallVector<char, 64> Buffer;
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114 raw_svector_ostream OS(Buffer);
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115 OS << "LLVM ERROR: " << Reason << "\n";
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116 StringRef MessageStr = OS.str();
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117 ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
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118 (void)written; // If something went wrong, we deliberately just give up.
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119 }
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120
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121 // If we reached here, we are failing ungracefully. Run the interrupt handlers
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122 // to make sure any special cleanups get done, in particular that we remove
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123 // files registered with RemoveFileOnSignal.
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124 sys::RunInterruptHandlers();
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125
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126 exit(1);
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127 }
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128
|
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121
|
129 void llvm::install_bad_alloc_error_handler(fatal_error_handler_t handler,
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130 void *user_data) {
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131 #if LLVM_ENABLE_THREADS == 1
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132 std::lock_guard<std::mutex> Lock(BadAllocErrorHandlerMutex);
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133 #endif
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134 assert(!ErrorHandler && "Bad alloc error handler already registered!\n");
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135 BadAllocErrorHandler = handler;
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136 BadAllocErrorHandlerUserData = user_data;
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137 }
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138
|
|
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139 void llvm::remove_bad_alloc_error_handler() {
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140 #if LLVM_ENABLE_THREADS == 1
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141 std::lock_guard<std::mutex> Lock(BadAllocErrorHandlerMutex);
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|
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142 #endif
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143 BadAllocErrorHandler = nullptr;
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144 BadAllocErrorHandlerUserData = nullptr;
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145 }
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146
|
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147 void llvm::report_bad_alloc_error(const char *Reason, bool GenCrashDiag) {
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148 fatal_error_handler_t Handler = nullptr;
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149 void *HandlerData = nullptr;
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150 {
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151 // Only acquire the mutex while reading the handler, so as not to invoke a
|
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152 // user-supplied callback under a lock.
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153 #if LLVM_ENABLE_THREADS == 1
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154 std::lock_guard<std::mutex> Lock(BadAllocErrorHandlerMutex);
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|
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155 #endif
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156 Handler = BadAllocErrorHandler;
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157 HandlerData = BadAllocErrorHandlerUserData;
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|
|
158 }
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159
|
|
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160 if (Handler) {
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161 Handler(HandlerData, Reason, GenCrashDiag);
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162 llvm_unreachable("bad alloc handler should not return");
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|
163 }
|
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164
|
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165 #ifdef LLVM_ENABLE_EXCEPTIONS
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166 // If exceptions are enabled, make OOM in malloc look like OOM in new.
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167 throw std::bad_alloc();
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|
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168 #else
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169 // Don't call the normal error handler. It may allocate memory. Directly write
|
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170 // an OOM to stderr and abort.
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171 char OOMMessage[] = "LLVM ERROR: out of memory\n";
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172 ssize_t written = ::write(2, OOMMessage, strlen(OOMMessage));
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173 (void)written;
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174 abort();
|
|
|
175 #endif
|
|
|
176 }
|
|
|
177
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178 void llvm::llvm_unreachable_internal(const char *msg, const char *file,
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179 unsigned line) {
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180 // This code intentionally doesn't call the ErrorHandler callback, because
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181 // llvm_unreachable is intended to be used to indicate "impossible"
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182 // situations, and not legitimate runtime errors.
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183 if (msg)
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184 dbgs() << msg << "\n";
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185 dbgs() << "UNREACHABLE executed";
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186 if (file)
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187 dbgs() << " at " << file << ":" << line;
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188 dbgs() << "!\n";
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189 abort();
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190 #ifdef LLVM_BUILTIN_UNREACHABLE
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191 // Windows systems and possibly others don't declare abort() to be noreturn,
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192 // so use the unreachable builtin to avoid a Clang self-host warning.
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193 LLVM_BUILTIN_UNREACHABLE;
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194 #endif
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195 }
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196
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197 static void bindingsErrorHandler(void *user_data, const std::string& reason,
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198 bool gen_crash_diag) {
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199 LLVMFatalErrorHandler handler =
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200 LLVM_EXTENSION reinterpret_cast<LLVMFatalErrorHandler>(user_data);
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201 handler(reason.c_str());
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202 }
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203
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204 void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
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205 install_fatal_error_handler(bindingsErrorHandler,
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206 LLVM_EXTENSION reinterpret_cast<void *>(Handler));
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207 }
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208
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209 void LLVMResetFatalErrorHandler() {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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210 remove_fatal_error_handler();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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211 }
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77
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212
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213 #ifdef LLVM_ON_WIN32
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214
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215 #include <winerror.h>
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216
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217 // I'd rather not double the line count of the following.
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218 #define MAP_ERR_TO_COND(x, y) \
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219 case x: \
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220 return make_error_code(errc::y)
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221
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222 std::error_code llvm::mapWindowsError(unsigned EV) {
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223 switch (EV) {
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224 MAP_ERR_TO_COND(ERROR_ACCESS_DENIED, permission_denied);
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225 MAP_ERR_TO_COND(ERROR_ALREADY_EXISTS, file_exists);
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226 MAP_ERR_TO_COND(ERROR_BAD_UNIT, no_such_device);
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227 MAP_ERR_TO_COND(ERROR_BUFFER_OVERFLOW, filename_too_long);
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228 MAP_ERR_TO_COND(ERROR_BUSY, device_or_resource_busy);
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229 MAP_ERR_TO_COND(ERROR_BUSY_DRIVE, device_or_resource_busy);
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230 MAP_ERR_TO_COND(ERROR_CANNOT_MAKE, permission_denied);
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231 MAP_ERR_TO_COND(ERROR_CANTOPEN, io_error);
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232 MAP_ERR_TO_COND(ERROR_CANTREAD, io_error);
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233 MAP_ERR_TO_COND(ERROR_CANTWRITE, io_error);
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234 MAP_ERR_TO_COND(ERROR_CURRENT_DIRECTORY, permission_denied);
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235 MAP_ERR_TO_COND(ERROR_DEV_NOT_EXIST, no_such_device);
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236 MAP_ERR_TO_COND(ERROR_DEVICE_IN_USE, device_or_resource_busy);
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237 MAP_ERR_TO_COND(ERROR_DIR_NOT_EMPTY, directory_not_empty);
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238 MAP_ERR_TO_COND(ERROR_DIRECTORY, invalid_argument);
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239 MAP_ERR_TO_COND(ERROR_DISK_FULL, no_space_on_device);
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240 MAP_ERR_TO_COND(ERROR_FILE_EXISTS, file_exists);
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241 MAP_ERR_TO_COND(ERROR_FILE_NOT_FOUND, no_such_file_or_directory);
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242 MAP_ERR_TO_COND(ERROR_HANDLE_DISK_FULL, no_space_on_device);
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243 MAP_ERR_TO_COND(ERROR_INVALID_ACCESS, permission_denied);
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244 MAP_ERR_TO_COND(ERROR_INVALID_DRIVE, no_such_device);
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245 MAP_ERR_TO_COND(ERROR_INVALID_FUNCTION, function_not_supported);
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246 MAP_ERR_TO_COND(ERROR_INVALID_HANDLE, invalid_argument);
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247 MAP_ERR_TO_COND(ERROR_INVALID_NAME, invalid_argument);
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248 MAP_ERR_TO_COND(ERROR_LOCK_VIOLATION, no_lock_available);
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249 MAP_ERR_TO_COND(ERROR_LOCKED, no_lock_available);
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250 MAP_ERR_TO_COND(ERROR_NEGATIVE_SEEK, invalid_argument);
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251 MAP_ERR_TO_COND(ERROR_NOACCESS, permission_denied);
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252 MAP_ERR_TO_COND(ERROR_NOT_ENOUGH_MEMORY, not_enough_memory);
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253 MAP_ERR_TO_COND(ERROR_NOT_READY, resource_unavailable_try_again);
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254 MAP_ERR_TO_COND(ERROR_OPEN_FAILED, io_error);
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255 MAP_ERR_TO_COND(ERROR_OPEN_FILES, device_or_resource_busy);
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256 MAP_ERR_TO_COND(ERROR_OUTOFMEMORY, not_enough_memory);
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257 MAP_ERR_TO_COND(ERROR_PATH_NOT_FOUND, no_such_file_or_directory);
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258 MAP_ERR_TO_COND(ERROR_BAD_NETPATH, no_such_file_or_directory);
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259 MAP_ERR_TO_COND(ERROR_READ_FAULT, io_error);
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260 MAP_ERR_TO_COND(ERROR_RETRY, resource_unavailable_try_again);
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261 MAP_ERR_TO_COND(ERROR_SEEK, io_error);
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262 MAP_ERR_TO_COND(ERROR_SHARING_VIOLATION, permission_denied);
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263 MAP_ERR_TO_COND(ERROR_TOO_MANY_OPEN_FILES, too_many_files_open);
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264 MAP_ERR_TO_COND(ERROR_WRITE_FAULT, io_error);
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265 MAP_ERR_TO_COND(ERROR_WRITE_PROTECT, permission_denied);
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266 MAP_ERR_TO_COND(WSAEACCES, permission_denied);
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267 MAP_ERR_TO_COND(WSAEBADF, bad_file_descriptor);
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268 MAP_ERR_TO_COND(WSAEFAULT, bad_address);
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269 MAP_ERR_TO_COND(WSAEINTR, interrupted);
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270 MAP_ERR_TO_COND(WSAEINVAL, invalid_argument);
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271 MAP_ERR_TO_COND(WSAEMFILE, too_many_files_open);
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272 MAP_ERR_TO_COND(WSAENAMETOOLONG, filename_too_long);
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273 default:
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274 return std::error_code(EV, std::system_category());
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275 }
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276 }
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277
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278 #endif
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