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annotate lib/Support/CrashRecoveryContext.cpp @ 83:60c9769439b8

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===--- CrashRecoveryContext.cpp - Crash Recovery ------------------------===//
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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 #include "llvm/Support/CrashRecoveryContext.h"
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11 #include "llvm/ADT/SmallString.h"
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12 #include "llvm/Config/config.h"
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13 #include "llvm/Support/ErrorHandling.h"
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14 #include "llvm/Support/ManagedStatic.h"
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15 #include "llvm/Support/Mutex.h"
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16 #include "llvm/Support/ThreadLocal.h"
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17 #include <cstdio>
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18 #include <setjmp.h>
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19 using namespace llvm;
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20
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21 namespace {
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22
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23 struct CrashRecoveryContextImpl;
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24
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25 static ManagedStatic<
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26 sys::ThreadLocal<const CrashRecoveryContextImpl> > CurrentContext;
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27
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28 struct CrashRecoveryContextImpl {
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29 CrashRecoveryContext *CRC;
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30 std::string Backtrace;
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31 ::jmp_buf JumpBuffer;
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32 volatile unsigned Failed : 1;
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33 unsigned SwitchedThread : 1;
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34
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35 public:
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36 CrashRecoveryContextImpl(CrashRecoveryContext *CRC) : CRC(CRC),
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37 Failed(false),
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38 SwitchedThread(false) {
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39 CurrentContext->set(this);
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40 }
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41 ~CrashRecoveryContextImpl() {
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42 if (!SwitchedThread)
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43 CurrentContext->erase();
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44 }
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45
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46 /// \brief Called when the separate crash-recovery thread was finished, to
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47 /// indicate that we don't need to clear the thread-local CurrentContext.
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48 void setSwitchedThread() { SwitchedThread = true; }
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49
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50 void HandleCrash() {
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51 // Eliminate the current context entry, to avoid re-entering in case the
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52 // cleanup code crashes.
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53 CurrentContext->erase();
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54
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55 assert(!Failed && "Crash recovery context already failed!");
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56 Failed = true;
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57
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58 // FIXME: Stash the backtrace.
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59
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60 // Jump back to the RunSafely we were called under.
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61 longjmp(JumpBuffer, 1);
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62 }
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63 };
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64
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65 }
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66
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67 static ManagedStatic<sys::Mutex> gCrashRecoveryContextMutex;
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68 static bool gCrashRecoveryEnabled = false;
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69
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70 static ManagedStatic<sys::ThreadLocal<const CrashRecoveryContextCleanup> >
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71 tlIsRecoveringFromCrash;
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72
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73 CrashRecoveryContextCleanup::~CrashRecoveryContextCleanup() {}
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74
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75 CrashRecoveryContext::~CrashRecoveryContext() {
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76 // Reclaim registered resources.
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77 CrashRecoveryContextCleanup *i = head;
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78 tlIsRecoveringFromCrash->set(head);
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79 while (i) {
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80 CrashRecoveryContextCleanup *tmp = i;
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81 i = tmp->next;
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82 tmp->cleanupFired = true;
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83 tmp->recoverResources();
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84 delete tmp;
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85 }
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86 tlIsRecoveringFromCrash->erase();
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87
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88 CrashRecoveryContextImpl *CRCI = (CrashRecoveryContextImpl *) Impl;
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89 delete CRCI;
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90 }
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91
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92 bool CrashRecoveryContext::isRecoveringFromCrash() {
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93 return tlIsRecoveringFromCrash->get() != nullptr;
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94 }
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95
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96 CrashRecoveryContext *CrashRecoveryContext::GetCurrent() {
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97 if (!gCrashRecoveryEnabled)
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98 return nullptr;
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99
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100 const CrashRecoveryContextImpl *CRCI = CurrentContext->get();
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101 if (!CRCI)
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102 return nullptr;
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103
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104 return CRCI->CRC;
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105 }
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106
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107 void CrashRecoveryContext::registerCleanup(CrashRecoveryContextCleanup *cleanup)
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108 {
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109 if (!cleanup)
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110 return;
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111 if (head)
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112 head->prev = cleanup;
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113 cleanup->next = head;
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114 head = cleanup;
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115 }
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116
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117 void
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118 CrashRecoveryContext::unregisterCleanup(CrashRecoveryContextCleanup *cleanup) {
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119 if (!cleanup)
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120 return;
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121 if (cleanup == head) {
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122 head = cleanup->next;
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123 if (head)
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124 head->prev = nullptr;
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125 }
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126 else {
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127 cleanup->prev->next = cleanup->next;
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128 if (cleanup->next)
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129 cleanup->next->prev = cleanup->prev;
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130 }
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131 delete cleanup;
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132 }
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133
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134 #ifdef LLVM_ON_WIN32
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135
77
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136 #include "Windows/WindowsSupport.h"
0
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137
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138 // On Windows, we can make use of vectored exception handling to
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139 // catch most crashing situations. Note that this does mean
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140 // we will be alerted of exceptions *before* structured exception
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141 // handling has the opportunity to catch it. But that isn't likely
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142 // to cause problems because nowhere in the project is SEH being
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143 // used.
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144 //
95c75e76d11b LLVM 3.4
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145 // Vectored exception handling is built on top of SEH, and so it
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146 // works on a per-thread basis.
95c75e76d11b LLVM 3.4
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147 //
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148 // The vectored exception handler functionality was added in Windows
95c75e76d11b LLVM 3.4
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149 // XP, so if support for older versions of Windows is required,
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150 // it will have to be added.
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151 //
95c75e76d11b LLVM 3.4
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152 // If we want to support as far back as Win2k, we could use the
95c75e76d11b LLVM 3.4
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153 // SetUnhandledExceptionFilter API, but there's a risk of that
95c75e76d11b LLVM 3.4
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154 // being entirely overwritten (it's not a chain).
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155
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156 static LONG CALLBACK ExceptionHandler(PEXCEPTION_POINTERS ExceptionInfo)
95c75e76d11b LLVM 3.4
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157 {
95c75e76d11b LLVM 3.4
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158 // Lookup the current thread local recovery object.
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159 const CrashRecoveryContextImpl *CRCI = CurrentContext->get();
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160
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161 if (!CRCI) {
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162 // Something has gone horribly wrong, so let's just tell everyone
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163 // to keep searching
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164 CrashRecoveryContext::Disable();
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165 return EXCEPTION_CONTINUE_SEARCH;
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166 }
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167
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168 // TODO: We can capture the stack backtrace here and store it on the
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169 // implementation if we so choose.
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170
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171 // Handle the crash
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172 const_cast<CrashRecoveryContextImpl*>(CRCI)->HandleCrash();
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173
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174 // Note that we don't actually get here because HandleCrash calls
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175 // longjmp, which means the HandleCrash function never returns.
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176 llvm_unreachable("Handled the crash, should have longjmp'ed out of here");
95c75e76d11b LLVM 3.4
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177 }
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178
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179 // Because the Enable and Disable calls are static, it means that
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180 // there may not actually be an Impl available, or even a current
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181 // CrashRecoveryContext at all. So we make use of a thread-local
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182 // exception table. The handles contained in here will either be
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183 // non-NULL, valid VEH handles, or NULL.
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184 static sys::ThreadLocal<const void> sCurrentExceptionHandle;
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185
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186 void CrashRecoveryContext::Enable() {
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187 sys::ScopedLock L(*gCrashRecoveryContextMutex);
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188
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189 if (gCrashRecoveryEnabled)
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190 return;
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191
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192 gCrashRecoveryEnabled = true;
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193
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194 // We can set up vectored exception handling now. We will install our
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195 // handler as the front of the list, though there's no assurances that
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196 // it will remain at the front (another call could install itself before
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197 // our handler). This 1) isn't likely, and 2) shouldn't cause problems.
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198 PVOID handle = ::AddVectoredExceptionHandler(1, ExceptionHandler);
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199 sCurrentExceptionHandle.set(handle);
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200 }
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201
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202 void CrashRecoveryContext::Disable() {
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203 sys::ScopedLock L(*gCrashRecoveryContextMutex);
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204
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205 if (!gCrashRecoveryEnabled)
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206 return;
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207
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208 gCrashRecoveryEnabled = false;
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209
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210 PVOID currentHandle = const_cast<PVOID>(sCurrentExceptionHandle.get());
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211 if (currentHandle) {
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212 // Now we can remove the vectored exception handler from the chain
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213 ::RemoveVectoredExceptionHandler(currentHandle);
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214
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215 // Reset the handle in our thread-local set.
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216 sCurrentExceptionHandle.set(NULL);
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217 }
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218 }
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219
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220 #else
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221
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222 // Generic POSIX implementation.
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223 //
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224 // This implementation relies on synchronous signals being delivered to the
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225 // current thread. We use a thread local object to keep track of the active
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226 // crash recovery context, and install signal handlers to invoke HandleCrash on
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227 // the active object.
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228 //
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229 // This implementation does not to attempt to chain signal handlers in any
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230 // reliable fashion -- if we get a signal outside of a crash recovery context we
95c75e76d11b LLVM 3.4
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231 // simply disable crash recovery and raise the signal again.
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232
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233 #include <signal.h>
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234
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235 static const int Signals[] =
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236 { SIGABRT, SIGBUS, SIGFPE, SIGILL, SIGSEGV, SIGTRAP };
0
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237 static const unsigned NumSignals = sizeof(Signals) / sizeof(Signals[0]);
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238 static struct sigaction PrevActions[NumSignals];
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239
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240 static void CrashRecoverySignalHandler(int Signal) {
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241 // Lookup the current thread local recovery object.
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242 const CrashRecoveryContextImpl *CRCI = CurrentContext->get();
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243
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244 if (!CRCI) {
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245 // We didn't find a crash recovery context -- this means either we got a
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parents:
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246 // signal on a thread we didn't expect it on, the application got a signal
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parents:
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247 // outside of a crash recovery context, or something else went horribly
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 // wrong.
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249 //
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parents:
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250 // Disable crash recovery and raise the signal again. The assumption here is
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parents:
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251 // that the enclosing application will terminate soon, and we won't want to
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parents:
diff changeset
252 // attempt crash recovery again.
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253 //
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parents:
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254 // This call of Disable isn't thread safe, but it doesn't actually matter.
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parents:
diff changeset
255 CrashRecoveryContext::Disable();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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256 raise(Signal);
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257
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258 // The signal will be thrown once the signal mask is restored.
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parents:
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259 return;
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parents:
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260 }
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parents:
diff changeset
261
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diff changeset
262 // Unblock the signal we received.
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263 sigset_t SigMask;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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264 sigemptyset(&SigMask);
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265 sigaddset(&SigMask, Signal);
77
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diff changeset
266 sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
0
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parents:
diff changeset
267
95c75e76d11b LLVM 3.4
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diff changeset
268 if (CRCI)
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269 const_cast<CrashRecoveryContextImpl*>(CRCI)->HandleCrash();
95c75e76d11b LLVM 3.4
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270 }
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271
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diff changeset
272 void CrashRecoveryContext::Enable() {
95c75e76d11b LLVM 3.4
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parents:
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273 sys::ScopedLock L(*gCrashRecoveryContextMutex);
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274
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275 if (gCrashRecoveryEnabled)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
276 return;
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277
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278 gCrashRecoveryEnabled = true;
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279
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diff changeset
280 // Setup the signal handler.
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281 struct sigaction Handler;
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parents:
diff changeset
282 Handler.sa_handler = CrashRecoverySignalHandler;
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diff changeset
283 Handler.sa_flags = 0;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
284 sigemptyset(&Handler.sa_mask);
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285
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diff changeset
286 for (unsigned i = 0; i != NumSignals; ++i) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
287 sigaction(Signals[i], &Handler, &PrevActions[i]);
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288 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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289 }
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290
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diff changeset
291 void CrashRecoveryContext::Disable() {
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parents:
diff changeset
292 sys::ScopedLock L(*gCrashRecoveryContextMutex);
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293
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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294 if (!gCrashRecoveryEnabled)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
295 return;
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296
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297 gCrashRecoveryEnabled = false;
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298
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parents:
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299 // Restore the previous signal handlers.
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300 for (unsigned i = 0; i != NumSignals; ++i)
77
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
301 sigaction(Signals[i], &PrevActions[i], nullptr);
0
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302 }
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303
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diff changeset
304 #endif
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305
77
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parents: 0
diff changeset
306 bool CrashRecoveryContext::RunSafely(function_ref<void()> Fn) {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
307 // If crash recovery is disabled, do nothing.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
308 if (gCrashRecoveryEnabled) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
309 assert(!Impl && "Crash recovery context already initialized!");
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
310 CrashRecoveryContextImpl *CRCI = new CrashRecoveryContextImpl(this);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
311 Impl = CRCI;
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parents:
diff changeset
312
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
313 if (setjmp(CRCI->JumpBuffer) != 0) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
314 return false;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
315 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
316 }
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parents:
diff changeset
317
77
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parents: 0
diff changeset
318 Fn();
0
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parents:
diff changeset
319 return true;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
320 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
321
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
322 void CrashRecoveryContext::HandleCrash() {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
323 CrashRecoveryContextImpl *CRCI = (CrashRecoveryContextImpl *) Impl;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
324 assert(CRCI && "Crash recovery context never initialized!");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
325 CRCI->HandleCrash();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
326 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
327
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
328 const std::string &CrashRecoveryContext::getBacktrace() const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
329 CrashRecoveryContextImpl *CRC = (CrashRecoveryContextImpl *) Impl;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
330 assert(CRC && "Crash recovery context never initialized!");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
331 assert(CRC->Failed && "No crash was detected!");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
332 return CRC->Backtrace;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
333 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
334
77
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parents: 0
diff changeset
335 // FIXME: Portability.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
336 static void setThreadBackgroundPriority() {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
337 #ifdef __APPLE__
54457678186b LLVM 3.6
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parents: 0
diff changeset
338 setpriority(PRIO_DARWIN_THREAD, 0, PRIO_DARWIN_BG);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
339 #endif
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
340 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
341
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
342 static bool hasThreadBackgroundPriority() {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
343 #ifdef __APPLE__
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
344 return getpriority(PRIO_DARWIN_THREAD, 0) == 1;
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
345 #else
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
346 return false;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
347 #endif
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
348 }
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
349
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
350 namespace {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
351 struct RunSafelyOnThreadInfo {
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
352 function_ref<void()> Fn;
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
353 CrashRecoveryContext *CRC;
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
354 bool UseBackgroundPriority;
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
355 bool Result;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
356 };
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
357 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
358
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
359 static void RunSafelyOnThread_Dispatch(void *UserData) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
360 RunSafelyOnThreadInfo *Info =
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
361 reinterpret_cast<RunSafelyOnThreadInfo*>(UserData);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
362
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
363 if (Info->UseBackgroundPriority)
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
364 setThreadBackgroundPriority();
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
365
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
366 Info->Result = Info->CRC->RunSafely(Info->Fn);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
367 }
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
368 bool CrashRecoveryContext::RunSafelyOnThread(function_ref<void()> Fn,
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
369 unsigned RequestedStackSize) {
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
370 bool UseBackgroundPriority = hasThreadBackgroundPriority();
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
371 RunSafelyOnThreadInfo Info = { Fn, this, UseBackgroundPriority, false };
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
372 llvm_execute_on_thread(RunSafelyOnThread_Dispatch, &Info, RequestedStackSize);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
373 if (CrashRecoveryContextImpl *CRC = (CrashRecoveryContextImpl *)Impl)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
374 CRC->setSwitchedThread();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
375 return Info.Result;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
376 }