1 //===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Jeff Cohen and is distributed under the
6 // University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides the Win32 specific implementation of the Signals class.
12 //===----------------------------------------------------------------------===//
26 #if ((HAVE_LIBIMAGEHLP != 1) || (HAVE_LIBPSAPI != 1))
27 #error "libimagehlp.a & libpsapi.a should be present"
30 #pragma comment(lib, "psapi.lib")
31 #pragma comment(lib, "dbghelp.lib")
35 static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
36 static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
38 // InterruptFunction - The function to call if ctrl-c is pressed.
39 static void (*InterruptFunction)() = 0;
41 static std::vector<llvm::sys::Path> *FilesToRemove = NULL;
42 static std::vector<llvm::sys::Path> *DirectoriesToRemove = NULL;
43 static bool RegisteredUnhandledExceptionFilter = false;
44 static bool CleanupExecuted = false;
45 static PTOP_LEVEL_EXCEPTION_FILTER OldFilter = NULL;
47 // Windows creates a new thread to execute the console handler when an event
48 // (such as CTRL/C) occurs. This causes concurrency issues with the above
49 // globals which this critical section addresses.
50 static CRITICAL_SECTION CriticalSection;
54 //===----------------------------------------------------------------------===//
55 //=== WARNING: Implementation here must contain only Win32 specific code
56 //=== and must not be UNIX code
57 //===----------------------------------------------------------------------===//
60 static void RegisterHandler() {
61 if (RegisteredUnhandledExceptionFilter) {
62 EnterCriticalSection(&CriticalSection);
66 // Now's the time to create the critical section. This is the first time
67 // through here, and there's only one thread.
68 InitializeCriticalSection(&CriticalSection);
70 // Enter it immediately. Now if someone hits CTRL/C, the console handler
71 // can't proceed until the globals are updated.
72 EnterCriticalSection(&CriticalSection);
74 RegisteredUnhandledExceptionFilter = true;
75 OldFilter = SetUnhandledExceptionFilter(LLVMUnhandledExceptionFilter);
76 SetConsoleCtrlHandler(LLVMConsoleCtrlHandler, TRUE);
78 // IMPORTANT NOTE: Caller must call LeaveCriticalSection(&CriticalSection) or
79 // else multi-threading problems will ensue.
82 // RemoveFileOnSignal - The public API
83 bool sys::RemoveFileOnSignal(const sys::Path &Filename, std::string* ErrMsg) {
86 if (CleanupExecuted) {
88 *ErrMsg = "Process terminating -- cannot register for removal";
92 if (FilesToRemove == NULL)
93 FilesToRemove = new std::vector<sys::Path>;
95 FilesToRemove->push_back(Filename);
97 LeaveCriticalSection(&CriticalSection);
101 // RemoveDirectoryOnSignal - The public API
102 bool sys::RemoveDirectoryOnSignal(const sys::Path& path, std::string* ErrMsg) {
104 const sys::FileStatus *Status = path.getFileStatus(false, ErrMsg);
107 if (!Status->isDir) {
109 *ErrMsg = path.toString() + " is not a directory";
115 if (CleanupExecuted) {
117 *ErrMsg = "Process terminating -- cannot register for removal";
121 if (DirectoriesToRemove == NULL)
122 DirectoriesToRemove = new std::vector<sys::Path>;
123 DirectoriesToRemove->push_back(path);
125 LeaveCriticalSection(&CriticalSection);
129 /// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
130 /// SIGSEGV) is delivered to the process, print a stack trace and then exit.
131 void sys::PrintStackTraceOnErrorSignal() {
133 LeaveCriticalSection(&CriticalSection);
137 void sys::SetInterruptFunction(void (*IF)()) {
139 InterruptFunction = IF;
140 LeaveCriticalSection(&CriticalSection);
144 static void Cleanup() {
145 EnterCriticalSection(&CriticalSection);
147 // Prevent other thread from registering new files and directories for
148 // removal, should we be executing because of the console handler callback.
149 CleanupExecuted = true;
151 // FIXME: open files cannot be deleted.
153 if (FilesToRemove != NULL)
154 while (!FilesToRemove->empty()) {
156 FilesToRemove->back().eraseFromDisk();
159 FilesToRemove->pop_back();
162 if (DirectoriesToRemove != NULL)
163 while (!DirectoriesToRemove->empty()) {
165 DirectoriesToRemove->back().eraseFromDisk(true);
168 DirectoriesToRemove->pop_back();
171 LeaveCriticalSection(&CriticalSection);
174 static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
178 // Initialize the STACKFRAME structure.
179 STACKFRAME StackFrame;
180 memset(&StackFrame, 0, sizeof(StackFrame));
182 StackFrame.AddrPC.Offset = ep->ContextRecord->Eip;
183 StackFrame.AddrPC.Mode = AddrModeFlat;
184 StackFrame.AddrStack.Offset = ep->ContextRecord->Esp;
185 StackFrame.AddrStack.Mode = AddrModeFlat;
186 StackFrame.AddrFrame.Offset = ep->ContextRecord->Ebp;
187 StackFrame.AddrFrame.Mode = AddrModeFlat;
189 HANDLE hProcess = GetCurrentProcess();
190 HANDLE hThread = GetCurrentThread();
192 // Initialize the symbol handler.
193 SymSetOptions(SYMOPT_DEFERRED_LOADS|SYMOPT_LOAD_LINES);
194 SymInitialize(hProcess, NULL, TRUE);
197 if (!StackWalk(IMAGE_FILE_MACHINE_I386, hProcess, hThread, &StackFrame,
198 ep->ContextRecord, NULL, SymFunctionTableAccess,
199 SymGetModuleBase, NULL)) {
203 if (StackFrame.AddrFrame.Offset == 0)
206 // Print the PC in hexadecimal.
207 DWORD PC = StackFrame.AddrPC.Offset;
208 fprintf(stderr, "%08X", PC);
210 // Print the parameters. Assume there are four.
211 fprintf(stderr, " (0x%08X 0x%08X 0x%08X 0x%08X)", StackFrame.Params[0],
212 StackFrame.Params[1], StackFrame.Params[2], StackFrame.Params[3]);
214 // Verify the PC belongs to a module in this process.
215 if (!SymGetModuleBase(hProcess, PC)) {
216 fputs(" <unknown module>\n", stderr);
220 // Print the symbol name.
222 IMAGEHLP_SYMBOL *symbol = reinterpret_cast<IMAGEHLP_SYMBOL *>(buffer);
223 memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL));
224 symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL);
225 symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL);
228 if (!SymGetSymFromAddr(hProcess, PC, &dwDisp, symbol)) {
235 fprintf(stderr, ", %s()+%04d bytes(s)", symbol->Name, dwDisp);
237 fprintf(stderr, ", %s", symbol->Name);
239 // Print the source file and line number information.
241 memset(&line, 0, sizeof(line));
242 line.SizeOfStruct = sizeof(line);
243 if (SymGetLineFromAddr(hProcess, PC, &dwDisp, &line)) {
244 fprintf(stderr, ", %s, line %d", line.FileName, line.LineNumber);
246 fprintf(stderr, "+%04d byte(s)", dwDisp);
252 assert(!"Crashed in LLVMUnhandledExceptionFilter");
255 // Allow dialog box to pop up allowing choice to start debugger.
257 return (*OldFilter)(ep);
259 return EXCEPTION_CONTINUE_SEARCH;
262 static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
263 // We are running in our very own thread, courtesy of Windows.
264 EnterCriticalSection(&CriticalSection);
267 // If an interrupt function has been set, go and run one it; otherwise,
269 void (*IF)() = InterruptFunction;
270 InterruptFunction = 0; // Don't run it on another CTRL-C.
273 // Note: if the interrupt function throws an exception, there is nothing
274 // to catch it in this thread so it will kill the process.
276 LeaveCriticalSection(&CriticalSection);
277 return TRUE; // Don't kill the process.
280 // Allow normal processing to take place; i.e., the process dies.
281 LeaveCriticalSection(&CriticalSection);