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//===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Jeff Cohen and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Signals class.
//
//===----------------------------------------------------------------------===//
#include "Win32.h"
#include <stdio.h>
#include <vector>
#ifdef __MINGW32__
#include <imagehlp.h>
#else
#include <dbghelp.h>
#endif
#include <psapi.h>
#pragma comment(lib, "psapi.lib")
#pragma comment(lib, "dbghelp.lib")
// Forward declare.
static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
static std::vector<llvm::sys::Path> *FilesToRemove = NULL;
static std::vector<llvm::sys::Path> *DirectoriesToRemove = NULL;
static bool RegisteredUnhandledExceptionFilter = false;
static bool CleanupExecuted = false;
static PTOP_LEVEL_EXCEPTION_FILTER OldFilter = NULL;
// Windows creates a new thread to execute the console handler when an event
// (such as CTRL/C) occurs. This causes concurrency issues with the above
// globals which this critical section addresses.
static CRITICAL_SECTION CriticalSection;
namespace llvm {
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//=== and must not be UNIX code
//===----------------------------------------------------------------------===//
static void RegisterHandler() {
if (RegisteredUnhandledExceptionFilter) {
EnterCriticalSection(&CriticalSection);
return;
}
// Now's the time to create the critical section. This is the first time
// through here, and there's only one thread.
InitializeCriticalSection(&CriticalSection);
// Enter it immediately. Now if someone hits CTRL/C, the console handler
// can't proceed until the globals are updated.
EnterCriticalSection(&CriticalSection);
RegisteredUnhandledExceptionFilter = true;
OldFilter = SetUnhandledExceptionFilter(LLVMUnhandledExceptionFilter);
SetConsoleCtrlHandler(LLVMConsoleCtrlHandler, TRUE);
// IMPORTANT NOTE: Caller must call LeaveCriticalSection(&CriticalSection) or
// else multi-threading problems will ensue.
}
// RemoveFileOnSignal - The public API
void sys::RemoveFileOnSignal(const sys::Path &Filename) {
RegisterHandler();
if (CleanupExecuted)
throw std::string("Process terminating -- cannot register for removal");
if (FilesToRemove == NULL)
FilesToRemove = new std::vector<sys::Path>;
FilesToRemove->push_back(Filename);
LeaveCriticalSection(&CriticalSection);
}
// RemoveDirectoryOnSignal - The public API
void sys::RemoveDirectoryOnSignal(const sys::Path& path) {
RegisterHandler();
if (CleanupExecuted)
throw std::string("Process terminating -- cannot register for removal");
if (path.isDirectory()) {
if (DirectoriesToRemove == NULL)
DirectoriesToRemove = new std::vector<sys::Path>;
DirectoriesToRemove->push_back(path);
}
LeaveCriticalSection(&CriticalSection);
}
/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
void sys::PrintStackTraceOnErrorSignal() {
RegisterHandler();
LeaveCriticalSection(&CriticalSection);
}
}
static void Cleanup() {
EnterCriticalSection(&CriticalSection);
// Prevent other thread from registering new files and directories for
// removal, should we be executing because of the console handler callback.
CleanupExecuted = true;
// FIXME: open files cannot be deleted.
if (FilesToRemove != NULL)
while (!FilesToRemove->empty()) {
try {
FilesToRemove->back().destroyFile();
} catch (...) {
}
FilesToRemove->pop_back();
}
if (DirectoriesToRemove != NULL)
while (!DirectoriesToRemove->empty()) {
try {
DirectoriesToRemove->back().destroyDirectory(true);
} catch (...) {
}
DirectoriesToRemove->pop_back();
}
LeaveCriticalSection(&CriticalSection);
}
static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
try {
Cleanup();
// Initialize the STACKFRAME structure.
STACKFRAME StackFrame;
memset(&StackFrame, 0, sizeof(StackFrame));
StackFrame.AddrPC.Offset = ep->ContextRecord->Eip;
StackFrame.AddrPC.Mode = AddrModeFlat;
StackFrame.AddrStack.Offset = ep->ContextRecord->Esp;
StackFrame.AddrStack.Mode = AddrModeFlat;
StackFrame.AddrFrame.Offset = ep->ContextRecord->Ebp;
StackFrame.AddrFrame.Mode = AddrModeFlat;
HANDLE hProcess = GetCurrentProcess();
HANDLE hThread = GetCurrentThread();
// Initialize the symbol handler.
SymSetOptions(SYMOPT_DEFERRED_LOADS|SYMOPT_LOAD_LINES);
SymInitialize(hProcess, NULL, TRUE);
while (true) {
if (!StackWalk(IMAGE_FILE_MACHINE_I386, hProcess, hThread, &StackFrame,
ep->ContextRecord, NULL, SymFunctionTableAccess,
SymGetModuleBase, NULL)) {
break;
}
if (StackFrame.AddrFrame.Offset == 0)
break;
// Print the PC in hexadecimal.
DWORD PC = StackFrame.AddrPC.Offset;
fprintf(stderr, "%08X", PC);
// Print the parameters. Assume there are four.
fprintf(stderr, " (0x%08X 0x%08X 0x%08X 0x%08X)", StackFrame.Params[0],
StackFrame.Params[1], StackFrame.Params[2], StackFrame.Params[3]);
// Verify the PC belongs to a module in this process.
if (!SymGetModuleBase(hProcess, PC)) {
fputs(" <unknown module>\n", stderr);
continue;
}
// Print the symbol name.
char buffer[512];
IMAGEHLP_SYMBOL *symbol = reinterpret_cast<IMAGEHLP_SYMBOL *>(buffer);
memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL));
symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL);
symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL);
DWORD dwDisp;
if (!SymGetSymFromAddr(hProcess, PC, &dwDisp, symbol)) {
fputc('\n', stderr);
continue;
}
buffer[511] = 0;
if (dwDisp > 0)
fprintf(stderr, ", %s()+%04d bytes(s)", symbol->Name, dwDisp);
else
fprintf(stderr, ", %s", symbol->Name);
// Print the source file and line number information.
IMAGEHLP_LINE line;
memset(&line, 0, sizeof(line));
line.SizeOfStruct = sizeof(line);
if (SymGetLineFromAddr(hProcess, PC, &dwDisp, &line)) {
fprintf(stderr, ", %s, line %d", line.FileName, line.LineNumber);
if (dwDisp > 0)
fprintf(stderr, "+%04d byte(s)", dwDisp);
}
fputc('\n', stderr);
}
} catch (...) {
assert(!"Crashed in LLVMUnhandledExceptionFilter");
}
// Allow dialog box to pop up allowing choice to start debugger.
if (OldFilter)
return (*OldFilter)(ep);
else
return EXCEPTION_CONTINUE_SEARCH;
}
static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
Cleanup();
// Allow normal processing to take place; i.e., the process dies.
return FALSE;
}
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