1 //===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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 WIN32_FILE_ATTRIBUTE_DATA fi;
105 if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi)) {
106 MakeErrMsg(ErrMsg, path.toString() + ": can't get status of file");
110 if (!(fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
112 *ErrMsg = path.toString() + ": not a directory";
118 if (CleanupExecuted) {
120 *ErrMsg = "Process terminating -- cannot register for removal";
124 if (DirectoriesToRemove == NULL)
125 DirectoriesToRemove = new std::vector<sys::Path>;
126 DirectoriesToRemove->push_back(path);
128 LeaveCriticalSection(&CriticalSection);
132 /// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
133 /// SIGSEGV) is delivered to the process, print a stack trace and then exit.
134 void sys::PrintStackTraceOnErrorSignal() {
136 LeaveCriticalSection(&CriticalSection);
140 void sys::SetInterruptFunction(void (*IF)()) {
142 InterruptFunction = IF;
143 LeaveCriticalSection(&CriticalSection);
147 static void Cleanup() {
148 EnterCriticalSection(&CriticalSection);
150 // Prevent other thread from registering new files and directories for
151 // removal, should we be executing because of the console handler callback.
152 CleanupExecuted = true;
154 // FIXME: open files cannot be deleted.
156 if (FilesToRemove != NULL)
157 while (!FilesToRemove->empty()) {
159 FilesToRemove->back().eraseFromDisk();
162 FilesToRemove->pop_back();
165 if (DirectoriesToRemove != NULL)
166 while (!DirectoriesToRemove->empty()) {
168 DirectoriesToRemove->back().eraseFromDisk(true);
171 DirectoriesToRemove->pop_back();
174 LeaveCriticalSection(&CriticalSection);
177 static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
182 // TODO: provide a x64 friendly version of the following
185 // Initialize the STACKFRAME structure.
186 STACKFRAME StackFrame;
187 memset(&StackFrame, 0, sizeof(StackFrame));
189 StackFrame.AddrPC.Offset = ep->ContextRecord->Eip;
190 StackFrame.AddrPC.Mode = AddrModeFlat;
191 StackFrame.AddrStack.Offset = ep->ContextRecord->Esp;
192 StackFrame.AddrStack.Mode = AddrModeFlat;
193 StackFrame.AddrFrame.Offset = ep->ContextRecord->Ebp;
194 StackFrame.AddrFrame.Mode = AddrModeFlat;
196 HANDLE hProcess = GetCurrentProcess();
197 HANDLE hThread = GetCurrentThread();
199 // Initialize the symbol handler.
200 SymSetOptions(SYMOPT_DEFERRED_LOADS|SYMOPT_LOAD_LINES);
201 SymInitialize(hProcess, NULL, TRUE);
204 if (!StackWalk(IMAGE_FILE_MACHINE_I386, hProcess, hThread, &StackFrame,
205 ep->ContextRecord, NULL, SymFunctionTableAccess,
206 SymGetModuleBase, NULL)) {
210 if (StackFrame.AddrFrame.Offset == 0)
213 // Print the PC in hexadecimal.
214 DWORD PC = StackFrame.AddrPC.Offset;
215 fprintf(stderr, "%08X", PC);
217 // Print the parameters. Assume there are four.
218 fprintf(stderr, " (0x%08X 0x%08X 0x%08X 0x%08X)", StackFrame.Params[0],
219 StackFrame.Params[1], StackFrame.Params[2], StackFrame.Params[3]);
221 // Verify the PC belongs to a module in this process.
222 if (!SymGetModuleBase(hProcess, PC)) {
223 fputs(" <unknown module>\n", stderr);
227 // Print the symbol name.
229 IMAGEHLP_SYMBOL *symbol = reinterpret_cast<IMAGEHLP_SYMBOL *>(buffer);
230 memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL));
231 symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL);
232 symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL);
235 if (!SymGetSymFromAddr(hProcess, PC, &dwDisp, symbol)) {
242 fprintf(stderr, ", %s()+%04d bytes(s)", symbol->Name, dwDisp);
244 fprintf(stderr, ", %s", symbol->Name);
246 // Print the source file and line number information.
248 memset(&line, 0, sizeof(line));
249 line.SizeOfStruct = sizeof(line);
250 if (SymGetLineFromAddr(hProcess, PC, &dwDisp, &line)) {
251 fprintf(stderr, ", %s, line %d", line.FileName, line.LineNumber);
253 fprintf(stderr, "+%04d byte(s)", dwDisp);
262 assert(!"Crashed in LLVMUnhandledExceptionFilter");
265 // Allow dialog box to pop up allowing choice to start debugger.
267 return (*OldFilter)(ep);
269 return EXCEPTION_CONTINUE_SEARCH;
272 static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
273 // We are running in our very own thread, courtesy of Windows.
274 EnterCriticalSection(&CriticalSection);
277 // If an interrupt function has been set, go and run one it; otherwise,
279 void (*IF)() = InterruptFunction;
280 InterruptFunction = 0; // Don't run it on another CTRL-C.
283 // Note: if the interrupt function throws an exception, there is nothing
284 // to catch it in this thread so it will kill the process.
286 LeaveCriticalSection(&CriticalSection);
287 return TRUE; // Don't kill the process.
290 // Allow normal processing to take place; i.e., the process dies.
291 LeaveCriticalSection(&CriticalSection);