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 //===----------------------------------------------------------------------===//
27 #if ((HAVE_LIBIMAGEHLP != 1) || (HAVE_LIBPSAPI != 1))
28 #error "libimagehlp.a & libpsapi.a should be present"
31 #pragma comment(lib, "psapi.lib")
32 #pragma comment(lib, "dbghelp.lib")
36 static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
37 static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
39 // InterruptFunction - The function to call if ctrl-c is pressed.
40 static void (*InterruptFunction)() = 0;
42 static std::vector<llvm::sys::Path> *FilesToRemove = NULL;
43 static std::vector<std::pair<void(*)(void*), void*> > *CallBacksToRun = 0;
44 static bool RegisteredUnhandledExceptionFilter = false;
45 static bool CleanupExecuted = false;
46 static bool ExitOnUnhandledExceptions = false;
47 static PTOP_LEVEL_EXCEPTION_FILTER OldFilter = NULL;
49 // Windows creates a new thread to execute the console handler when an event
50 // (such as CTRL/C) occurs. This causes concurrency issues with the above
51 // globals which this critical section addresses.
52 static CRITICAL_SECTION CriticalSection;
56 //===----------------------------------------------------------------------===//
57 //=== WARNING: Implementation here must contain only Win32 specific code
58 //=== and must not be UNIX code
59 //===----------------------------------------------------------------------===//
62 /// CRTReportHook - Function called on a CRT debugging event.
63 static int CRTReportHook(int ReportType, char *Message, int *Return) {
64 // Don't cause a DebugBreak() on return.
71 fprintf(stderr, "CRT assert: %s\n", Message);
72 // FIXME: Is there a way to just crash? Perhaps throw to the unhandled
73 // exception code? Perhaps SetErrorMode() handles this.
77 fprintf(stderr, "CRT error: %s\n", Message);
78 // FIXME: Is there a way to just crash? Perhaps throw to the unhandled
79 // exception code? Perhaps SetErrorMode() handles this.
83 fprintf(stderr, "CRT warn: %s\n", Message);
87 // Don't call _CrtDbgReport.
92 static void RegisterHandler() {
93 if (RegisteredUnhandledExceptionFilter) {
94 EnterCriticalSection(&CriticalSection);
98 // Now's the time to create the critical section. This is the first time
99 // through here, and there's only one thread.
100 InitializeCriticalSection(&CriticalSection);
102 // Enter it immediately. Now if someone hits CTRL/C, the console handler
103 // can't proceed until the globals are updated.
104 EnterCriticalSection(&CriticalSection);
106 RegisteredUnhandledExceptionFilter = true;
107 OldFilter = SetUnhandledExceptionFilter(LLVMUnhandledExceptionFilter);
108 SetConsoleCtrlHandler(LLVMConsoleCtrlHandler, TRUE);
110 // Environment variable to disable any kind of crash dialog.
111 if (getenv("LLVM_DISABLE_CRT_DEBUG")) {
113 _CrtSetReportHook(CRTReportHook);
115 ExitOnUnhandledExceptions = true;
118 // IMPORTANT NOTE: Caller must call LeaveCriticalSection(&CriticalSection) or
119 // else multi-threading problems will ensue.
122 // RemoveFileOnSignal - The public API
123 bool sys::RemoveFileOnSignal(const sys::Path &Filename, std::string* ErrMsg) {
126 if (CleanupExecuted) {
128 *ErrMsg = "Process terminating -- cannot register for removal";
132 if (FilesToRemove == NULL)
133 FilesToRemove = new std::vector<sys::Path>;
135 FilesToRemove->push_back(Filename);
137 LeaveCriticalSection(&CriticalSection);
141 // DontRemoveFileOnSignal - The public API
142 void sys::DontRemoveFileOnSignal(const sys::Path &Filename) {
143 if (FilesToRemove == NULL)
148 FilesToRemove->push_back(Filename);
149 std::vector<sys::Path>::reverse_iterator I =
150 std::find(FilesToRemove->rbegin(), FilesToRemove->rend(), Filename);
151 if (I != FilesToRemove->rend())
152 FilesToRemove->erase(I.base()-1);
154 LeaveCriticalSection(&CriticalSection);
157 /// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
158 /// SIGSEGV) is delivered to the process, print a stack trace and then exit.
159 void sys::PrintStackTraceOnErrorSignal() {
161 LeaveCriticalSection(&CriticalSection);
165 void sys::SetInterruptFunction(void (*IF)()) {
167 InterruptFunction = IF;
168 LeaveCriticalSection(&CriticalSection);
172 /// AddSignalHandler - Add a function to be called when a signal is delivered
173 /// to the process. The handler can have a cookie passed to it to identify
174 /// what instance of the handler it is.
175 void sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
176 if (CallBacksToRun == 0)
177 CallBacksToRun = new std::vector<std::pair<void(*)(void*), void*> >();
178 CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
180 LeaveCriticalSection(&CriticalSection);
184 static void Cleanup() {
185 EnterCriticalSection(&CriticalSection);
187 // Prevent other thread from registering new files and directories for
188 // removal, should we be executing because of the console handler callback.
189 CleanupExecuted = true;
191 // FIXME: open files cannot be deleted.
193 if (FilesToRemove != NULL)
194 while (!FilesToRemove->empty()) {
195 FilesToRemove->back().eraseFromDisk();
196 FilesToRemove->pop_back();
200 for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
201 (*CallBacksToRun)[i].first((*CallBacksToRun)[i].second);
203 LeaveCriticalSection(&CriticalSection);
206 void llvm::sys::RunInterruptHandlers() {
210 static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
214 // TODO: provide a x64 friendly version of the following
217 // Initialize the STACKFRAME structure.
218 STACKFRAME StackFrame;
219 memset(&StackFrame, 0, sizeof(StackFrame));
221 StackFrame.AddrPC.Offset = ep->ContextRecord->Eip;
222 StackFrame.AddrPC.Mode = AddrModeFlat;
223 StackFrame.AddrStack.Offset = ep->ContextRecord->Esp;
224 StackFrame.AddrStack.Mode = AddrModeFlat;
225 StackFrame.AddrFrame.Offset = ep->ContextRecord->Ebp;
226 StackFrame.AddrFrame.Mode = AddrModeFlat;
228 HANDLE hProcess = GetCurrentProcess();
229 HANDLE hThread = GetCurrentThread();
231 // Initialize the symbol handler.
232 SymSetOptions(SYMOPT_DEFERRED_LOADS|SYMOPT_LOAD_LINES);
233 SymInitialize(hProcess, NULL, TRUE);
236 if (!StackWalk(IMAGE_FILE_MACHINE_I386, hProcess, hThread, &StackFrame,
237 ep->ContextRecord, NULL, SymFunctionTableAccess,
238 SymGetModuleBase, NULL)) {
242 if (StackFrame.AddrFrame.Offset == 0)
245 // Print the PC in hexadecimal.
246 DWORD PC = StackFrame.AddrPC.Offset;
247 fprintf(stderr, "%08lX", PC);
249 // Print the parameters. Assume there are four.
250 fprintf(stderr, " (0x%08lX 0x%08lX 0x%08lX 0x%08lX)",
251 StackFrame.Params[0],
252 StackFrame.Params[1], StackFrame.Params[2], StackFrame.Params[3]);
254 // Verify the PC belongs to a module in this process.
255 if (!SymGetModuleBase(hProcess, PC)) {
256 fputs(" <unknown module>\n", stderr);
260 // Print the symbol name.
262 IMAGEHLP_SYMBOL *symbol = reinterpret_cast<IMAGEHLP_SYMBOL *>(buffer);
263 memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL));
264 symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL);
265 symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL);
268 if (!SymGetSymFromAddr(hProcess, PC, &dwDisp, symbol)) {
275 fprintf(stderr, ", %s()+%04lu bytes(s)", symbol->Name, dwDisp);
277 fprintf(stderr, ", %s", symbol->Name);
279 // Print the source file and line number information.
281 memset(&line, 0, sizeof(line));
282 line.SizeOfStruct = sizeof(line);
283 if (SymGetLineFromAddr(hProcess, PC, &dwDisp, &line)) {
284 fprintf(stderr, ", %s, line %lu", line.FileName, line.LineNumber);
286 fprintf(stderr, "+%04lu byte(s)", dwDisp);
294 if (ExitOnUnhandledExceptions)
297 // Allow dialog box to pop up allowing choice to start debugger.
299 return (*OldFilter)(ep);
301 return EXCEPTION_CONTINUE_SEARCH;
304 static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
305 // We are running in our very own thread, courtesy of Windows.
306 EnterCriticalSection(&CriticalSection);
309 // If an interrupt function has been set, go and run one it; otherwise,
311 void (*IF)() = InterruptFunction;
312 InterruptFunction = 0; // Don't run it on another CTRL-C.
315 // Note: if the interrupt function throws an exception, there is nothing
316 // to catch it in this thread so it will kill the process.
318 LeaveCriticalSection(&CriticalSection);
319 return TRUE; // Don't kill the process.
322 // Allow normal processing to take place; i.e., the process dies.
323 LeaveCriticalSection(&CriticalSection);