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295 lines
8.7 KiB
C++
295 lines
8.7 KiB
C++
//===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the Win32 specific implementation of the Signals class.
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//
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//===----------------------------------------------------------------------===//
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#include "Win32.h"
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#include <stdio.h>
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#include <vector>
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#ifdef __MINGW32__
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#include <imagehlp.h>
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#else
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#include <dbghelp.h>
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#endif
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#include <psapi.h>
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#ifdef __MINGW32__
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#if ((HAVE_LIBIMAGEHLP != 1) || (HAVE_LIBPSAPI != 1))
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#error "libimagehlp.a & libpsapi.a should be present"
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#endif
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#else
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#pragma comment(lib, "psapi.lib")
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#pragma comment(lib, "dbghelp.lib")
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#endif
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// Forward declare.
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static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
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static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
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// InterruptFunction - The function to call if ctrl-c is pressed.
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static void (*InterruptFunction)() = 0;
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static std::vector<llvm::sys::Path> *FilesToRemove = NULL;
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static std::vector<llvm::sys::Path> *DirectoriesToRemove = NULL;
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static bool RegisteredUnhandledExceptionFilter = false;
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static bool CleanupExecuted = false;
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static PTOP_LEVEL_EXCEPTION_FILTER OldFilter = NULL;
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// Windows creates a new thread to execute the console handler when an event
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// (such as CTRL/C) occurs. This causes concurrency issues with the above
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// globals which this critical section addresses.
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static CRITICAL_SECTION CriticalSection;
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namespace llvm {
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only Win32 specific code
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//=== and must not be UNIX code
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//===----------------------------------------------------------------------===//
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static void RegisterHandler() {
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if (RegisteredUnhandledExceptionFilter) {
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EnterCriticalSection(&CriticalSection);
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return;
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}
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// Now's the time to create the critical section. This is the first time
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// through here, and there's only one thread.
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InitializeCriticalSection(&CriticalSection);
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// Enter it immediately. Now if someone hits CTRL/C, the console handler
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// can't proceed until the globals are updated.
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EnterCriticalSection(&CriticalSection);
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RegisteredUnhandledExceptionFilter = true;
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OldFilter = SetUnhandledExceptionFilter(LLVMUnhandledExceptionFilter);
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SetConsoleCtrlHandler(LLVMConsoleCtrlHandler, TRUE);
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// IMPORTANT NOTE: Caller must call LeaveCriticalSection(&CriticalSection) or
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// else multi-threading problems will ensue.
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}
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// RemoveFileOnSignal - The public API
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bool sys::RemoveFileOnSignal(const sys::Path &Filename, std::string* ErrMsg) {
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RegisterHandler();
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if (CleanupExecuted) {
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if (ErrMsg)
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*ErrMsg = "Process terminating -- cannot register for removal";
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return true;
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}
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if (FilesToRemove == NULL)
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FilesToRemove = new std::vector<sys::Path>;
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FilesToRemove->push_back(Filename);
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LeaveCriticalSection(&CriticalSection);
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return false;
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}
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// RemoveDirectoryOnSignal - The public API
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bool sys::RemoveDirectoryOnSignal(const sys::Path& path, std::string* ErrMsg) {
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// Not a directory?
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WIN32_FILE_ATTRIBUTE_DATA fi;
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if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi)) {
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MakeErrMsg(ErrMsg, path.toString() + ": can't get status of file");
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return true;
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}
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if (!(fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
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if (ErrMsg)
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*ErrMsg = path.toString() + ": not a directory";
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return true;
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}
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RegisterHandler();
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if (CleanupExecuted) {
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if (ErrMsg)
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*ErrMsg = "Process terminating -- cannot register for removal";
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return true;
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}
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if (DirectoriesToRemove == NULL)
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DirectoriesToRemove = new std::vector<sys::Path>;
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DirectoriesToRemove->push_back(path);
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LeaveCriticalSection(&CriticalSection);
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return false;
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}
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/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
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/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
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void sys::PrintStackTraceOnErrorSignal() {
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RegisterHandler();
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LeaveCriticalSection(&CriticalSection);
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}
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void sys::SetInterruptFunction(void (*IF)()) {
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RegisterHandler();
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InterruptFunction = IF;
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LeaveCriticalSection(&CriticalSection);
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}
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}
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static void Cleanup() {
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EnterCriticalSection(&CriticalSection);
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// Prevent other thread from registering new files and directories for
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// removal, should we be executing because of the console handler callback.
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CleanupExecuted = true;
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// FIXME: open files cannot be deleted.
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if (FilesToRemove != NULL)
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while (!FilesToRemove->empty()) {
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try {
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FilesToRemove->back().eraseFromDisk();
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} catch (...) {
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}
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FilesToRemove->pop_back();
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}
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if (DirectoriesToRemove != NULL)
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while (!DirectoriesToRemove->empty()) {
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try {
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DirectoriesToRemove->back().eraseFromDisk(true);
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} catch (...) {
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}
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DirectoriesToRemove->pop_back();
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}
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LeaveCriticalSection(&CriticalSection);
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}
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static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
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try {
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Cleanup();
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#ifdef _WIN64
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// TODO: provide a x64 friendly version of the following
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#else
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// Initialize the STACKFRAME structure.
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STACKFRAME StackFrame;
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memset(&StackFrame, 0, sizeof(StackFrame));
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StackFrame.AddrPC.Offset = ep->ContextRecord->Eip;
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StackFrame.AddrPC.Mode = AddrModeFlat;
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StackFrame.AddrStack.Offset = ep->ContextRecord->Esp;
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StackFrame.AddrStack.Mode = AddrModeFlat;
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StackFrame.AddrFrame.Offset = ep->ContextRecord->Ebp;
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StackFrame.AddrFrame.Mode = AddrModeFlat;
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HANDLE hProcess = GetCurrentProcess();
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HANDLE hThread = GetCurrentThread();
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// Initialize the symbol handler.
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SymSetOptions(SYMOPT_DEFERRED_LOADS|SYMOPT_LOAD_LINES);
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SymInitialize(hProcess, NULL, TRUE);
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while (true) {
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if (!StackWalk(IMAGE_FILE_MACHINE_I386, hProcess, hThread, &StackFrame,
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ep->ContextRecord, NULL, SymFunctionTableAccess,
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SymGetModuleBase, NULL)) {
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break;
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}
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if (StackFrame.AddrFrame.Offset == 0)
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break;
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// Print the PC in hexadecimal.
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DWORD PC = StackFrame.AddrPC.Offset;
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fprintf(stderr, "%08X", PC);
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// Print the parameters. Assume there are four.
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fprintf(stderr, " (0x%08X 0x%08X 0x%08X 0x%08X)", StackFrame.Params[0],
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StackFrame.Params[1], StackFrame.Params[2], StackFrame.Params[3]);
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// Verify the PC belongs to a module in this process.
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if (!SymGetModuleBase(hProcess, PC)) {
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fputs(" <unknown module>\n", stderr);
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continue;
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}
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// Print the symbol name.
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char buffer[512];
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IMAGEHLP_SYMBOL *symbol = reinterpret_cast<IMAGEHLP_SYMBOL *>(buffer);
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memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL));
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symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL);
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symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL);
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DWORD dwDisp;
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if (!SymGetSymFromAddr(hProcess, PC, &dwDisp, symbol)) {
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fputc('\n', stderr);
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continue;
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}
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buffer[511] = 0;
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if (dwDisp > 0)
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fprintf(stderr, ", %s()+%04d bytes(s)", symbol->Name, dwDisp);
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else
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fprintf(stderr, ", %s", symbol->Name);
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// Print the source file and line number information.
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IMAGEHLP_LINE line;
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memset(&line, 0, sizeof(line));
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line.SizeOfStruct = sizeof(line);
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if (SymGetLineFromAddr(hProcess, PC, &dwDisp, &line)) {
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fprintf(stderr, ", %s, line %d", line.FileName, line.LineNumber);
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if (dwDisp > 0)
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fprintf(stderr, "+%04d byte(s)", dwDisp);
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}
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fputc('\n', stderr);
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}
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#endif
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} catch (...) {
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assert(!"Crashed in LLVMUnhandledExceptionFilter");
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}
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// Allow dialog box to pop up allowing choice to start debugger.
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if (OldFilter)
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return (*OldFilter)(ep);
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else
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return EXCEPTION_CONTINUE_SEARCH;
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}
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static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
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// We are running in our very own thread, courtesy of Windows.
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EnterCriticalSection(&CriticalSection);
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Cleanup();
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// If an interrupt function has been set, go and run one it; otherwise,
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// the process dies.
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void (*IF)() = InterruptFunction;
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InterruptFunction = 0; // Don't run it on another CTRL-C.
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if (IF) {
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// Note: if the interrupt function throws an exception, there is nothing
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// to catch it in this thread so it will kill the process.
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IF(); // Run it now.
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LeaveCriticalSection(&CriticalSection);
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return TRUE; // Don't kill the process.
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}
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// Allow normal processing to take place; i.e., the process dies.
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LeaveCriticalSection(&CriticalSection);
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return FALSE;
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}
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