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llvm-project/llvm/lib/Support/Windows/Signals.inc

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//===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 "llvm/Support/FileSystem.h"
#include <algorithm>
#include <signal.h>
#include <stdio.h>
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
// The Windows.h header must be after LLVM and standard headers.
#include "WindowsSupport.h"
#ifdef __MINGW32__
#include <imagehlp.h>
#else
#include <dbghelp.h>
#endif
#include <psapi.h>
#ifdef _MSC_VER
#pragma comment(lib, "psapi.lib")
#elif __MINGW32__
#if (HAVE_LIBPSAPI != 1)
#error "libpsapi.a should be present"
#endif
// The version of g++ that comes with MinGW does *not* properly understand
// the ll format specifier for printf. However, MinGW passes the format
// specifiers on to the MSVCRT entirely, and the CRT understands the ll
// specifier. So these warnings are spurious in this case. Since we compile
// with -Wall, this will generate these warnings which should be ignored. So
// we will turn off the warnings for this just file. However, MinGW also does
// not support push and pop for diagnostics, so we have to manually turn it
// back on at the end of the file.
#pragma GCC diagnostic ignored "-Wformat"
#pragma GCC diagnostic ignored "-Wformat-extra-args"
#if !defined(__MINGW64_VERSION_MAJOR)
// MinGW.org does not have updated support for the 64-bit versions of the
// DebugHlp APIs. So we will have to load them manually. The structures and
// method signatures were pulled from DbgHelp.h in the Windows Platform SDK,
// and adjusted for brevity.
typedef struct _IMAGEHLP_LINE64 {
DWORD SizeOfStruct;
PVOID Key;
DWORD LineNumber;
PCHAR FileName;
DWORD64 Address;
} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
typedef struct _IMAGEHLP_SYMBOL64 {
DWORD SizeOfStruct;
DWORD64 Address;
DWORD Size;
DWORD Flags;
DWORD MaxNameLength;
CHAR Name[1];
} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
typedef struct _tagADDRESS64 {
DWORD64 Offset;
WORD Segment;
ADDRESS_MODE Mode;
} ADDRESS64, *LPADDRESS64;
typedef struct _KDHELP64 {
DWORD64 Thread;
DWORD ThCallbackStack;
DWORD ThCallbackBStore;
DWORD NextCallback;
DWORD FramePointer;
DWORD64 KiCallUserMode;
DWORD64 KeUserCallbackDispatcher;
DWORD64 SystemRangeStart;
DWORD64 KiUserExceptionDispatcher;
DWORD64 StackBase;
DWORD64 StackLimit;
DWORD64 Reserved[5];
} KDHELP64, *PKDHELP64;
typedef struct _tagSTACKFRAME64 {
ADDRESS64 AddrPC;
ADDRESS64 AddrReturn;
ADDRESS64 AddrFrame;
ADDRESS64 AddrStack;
ADDRESS64 AddrBStore;
PVOID FuncTableEntry;
DWORD64 Params[4];
BOOL Far;
BOOL Virtual;
DWORD64 Reserved[3];
KDHELP64 KdHelp;
} STACKFRAME64, *LPSTACKFRAME64;
#endif // !defined(__MINGW64_VERSION_MAJOR)
#endif // __MINGW32__
typedef BOOL (__stdcall *PREAD_PROCESS_MEMORY_ROUTINE64)(HANDLE hProcess,
DWORD64 qwBaseAddress, PVOID lpBuffer, DWORD nSize,
LPDWORD lpNumberOfBytesRead);
typedef PVOID (__stdcall *PFUNCTION_TABLE_ACCESS_ROUTINE64)( HANDLE ahProcess,
DWORD64 AddrBase);
typedef DWORD64 (__stdcall *PGET_MODULE_BASE_ROUTINE64)(HANDLE hProcess,
DWORD64 Address);
typedef DWORD64 (__stdcall *PTRANSLATE_ADDRESS_ROUTINE64)(HANDLE hProcess,
HANDLE hThread, LPADDRESS64 lpaddr);
typedef BOOL (WINAPI *fpStackWalk64)(DWORD, HANDLE, HANDLE, LPSTACKFRAME64,
PVOID, PREAD_PROCESS_MEMORY_ROUTINE64,
PFUNCTION_TABLE_ACCESS_ROUTINE64,
PGET_MODULE_BASE_ROUTINE64,
PTRANSLATE_ADDRESS_ROUTINE64);
static fpStackWalk64 fStackWalk64;
typedef DWORD64 (WINAPI *fpSymGetModuleBase64)(HANDLE, DWORD64);
static fpSymGetModuleBase64 fSymGetModuleBase64;
typedef BOOL (WINAPI *fpSymGetSymFromAddr64)(HANDLE, DWORD64,
PDWORD64, PIMAGEHLP_SYMBOL64);
static fpSymGetSymFromAddr64 fSymGetSymFromAddr64;
typedef BOOL (WINAPI *fpSymGetLineFromAddr64)(HANDLE, DWORD64,
PDWORD, PIMAGEHLP_LINE64);
static fpSymGetLineFromAddr64 fSymGetLineFromAddr64;
typedef BOOL(WINAPI *fpSymGetModuleInfo64)(HANDLE hProcess, DWORD64 dwAddr,
PIMAGEHLP_MODULE64 ModuleInfo);
static fpSymGetModuleInfo64 fSymGetModuleInfo64;
typedef PVOID (WINAPI *fpSymFunctionTableAccess64)(HANDLE, DWORD64);
static fpSymFunctionTableAccess64 fSymFunctionTableAccess64;
typedef DWORD (WINAPI *fpSymSetOptions)(DWORD);
static fpSymSetOptions fSymSetOptions;
typedef BOOL (WINAPI *fpSymInitialize)(HANDLE, PCSTR, BOOL);
static fpSymInitialize fSymInitialize;
typedef BOOL (WINAPI *fpEnumerateLoadedModules)(HANDLE,PENUMLOADED_MODULES_CALLBACK64,PVOID);
static fpEnumerateLoadedModules fEnumerateLoadedModules;
static bool load64BitDebugHelp(void) {
HMODULE hLib = ::LoadLibraryW(L"Dbghelp.dll");
if (hLib) {
fStackWalk64 = (fpStackWalk64)
::GetProcAddress(hLib, "StackWalk64");
fSymGetModuleBase64 = (fpSymGetModuleBase64)
::GetProcAddress(hLib, "SymGetModuleBase64");
fSymGetSymFromAddr64 = (fpSymGetSymFromAddr64)
::GetProcAddress(hLib, "SymGetSymFromAddr64");
fSymGetLineFromAddr64 = (fpSymGetLineFromAddr64)
::GetProcAddress(hLib, "SymGetLineFromAddr64");
fSymGetModuleInfo64 = (fpSymGetModuleInfo64)
::GetProcAddress(hLib, "SymGetModuleInfo64");
fSymFunctionTableAccess64 = (fpSymFunctionTableAccess64)
::GetProcAddress(hLib, "SymFunctionTableAccess64");
fSymSetOptions = (fpSymSetOptions)::GetProcAddress(hLib, "SymSetOptions");
fSymInitialize = (fpSymInitialize)::GetProcAddress(hLib, "SymInitialize");
fEnumerateLoadedModules = (fpEnumerateLoadedModules)
::GetProcAddress(hLib, "EnumerateLoadedModules64");
}
return fStackWalk64 && fSymInitialize && fSymSetOptions;
}
using namespace llvm;
// Forward declare.
static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
// InterruptFunction - The function to call if ctrl-c is pressed.
static void (*InterruptFunction)() = 0;
static std::vector<std::string> *FilesToRemove = 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;
static bool CriticalSectionInitialized = false;
enum {
#if defined(_M_X64)
NativeMachineType = IMAGE_FILE_MACHINE_AMD64
#else
NativeMachineType = IMAGE_FILE_MACHINE_I386
#endif
};
static bool printStackTraceWithLLVMSymbolizer(llvm::raw_ostream &OS,
HANDLE hProcess, HANDLE hThread,
STACKFRAME64 &StackFrameOrig,
CONTEXT *ContextOrig) {
// StackWalk64 modifies the incoming stack frame and context, so copy them.
STACKFRAME64 StackFrame = StackFrameOrig;
// Copy the register context so that we don't modify it while we unwind. We
// could use InitializeContext + CopyContext, but that's only required to get
// at AVX registers, which typically aren't needed by StackWalk64. Reduce the
// flag set to indicate that there's less data.
CONTEXT Context = *ContextOrig;
Context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
static void *StackTrace[256];
size_t Depth = 0;
while (fStackWalk64(NativeMachineType, hProcess, hThread, &StackFrame,
&Context, 0, fSymFunctionTableAccess64,
fSymGetModuleBase64, 0)) {
if (StackFrame.AddrFrame.Offset == 0)
break;
StackTrace[Depth++] = (void *)(uintptr_t)StackFrame.AddrPC.Offset;
if (Depth >= array_lengthof(StackTrace))
break;
}
return printSymbolizedStackTrace(&StackTrace[0], Depth, OS);
}
namespace {
struct FindModuleData {
void **StackTrace;
int Depth;
const char **Modules;
intptr_t *Offsets;
StringSaver *StrPool;
};
}
static BOOL CALLBACK findModuleCallback(WIN32_ELMCB_PCSTR ModuleName,
DWORD64 ModuleBase, ULONG ModuleSize,
void *VoidData) {
FindModuleData *Data = (FindModuleData*)VoidData;
intptr_t Beg = ModuleBase;
intptr_t End = Beg + ModuleSize;
for (int I = 0; I < Data->Depth; I++) {
if (Data->Modules[I])
continue;
intptr_t Addr = (intptr_t)Data->StackTrace[I];
if (Beg <= Addr && Addr < End) {
Data->Modules[I] = Data->StrPool->save(ModuleName);
Data->Offsets[I] = Addr - Beg;
}
}
return TRUE;
}
static bool findModulesAndOffsets(void **StackTrace, int Depth,
const char **Modules, intptr_t *Offsets,
const char *MainExecutableName,
StringSaver &StrPool) {
if (!fEnumerateLoadedModules)
return false;
FindModuleData Data;
Data.StackTrace = StackTrace;
Data.Depth = Depth;
Data.Modules = Modules;
Data.Offsets = Offsets;
Data.StrPool = &StrPool;
fEnumerateLoadedModules(GetCurrentProcess(), findModuleCallback, &Data);
return true;
}
static void PrintStackTraceForThread(llvm::raw_ostream &OS, HANDLE hProcess,
HANDLE hThread, STACKFRAME64 &StackFrame,
CONTEXT *Context) {
// Initialize the symbol handler.
fSymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_LOAD_LINES);
fSymInitialize(hProcess, NULL, TRUE);
// Try llvm-symbolizer first. llvm-symbolizer knows how to deal with both PDBs
// and DWARF, so it should do a good job regardless of what debug info or
// linker is in use.
if (printStackTraceWithLLVMSymbolizer(OS, hProcess, hThread, StackFrame,
Context)) {
return;
}
while (true) {
if (!fStackWalk64(NativeMachineType, hProcess, hThread, &StackFrame,
Context, 0, fSymFunctionTableAccess64,
fSymGetModuleBase64, 0)) {
break;
}
if (StackFrame.AddrFrame.Offset == 0)
break;
using namespace llvm;
// Print the PC in hexadecimal.
DWORD64 PC = StackFrame.AddrPC.Offset;
#if defined(_M_X64)
OS << format("0x%016llX", PC);
#elif defined(_M_IX86)
OS << format("0x%08lX", static_cast<DWORD>(PC));
#endif
// Print the parameters. Assume there are four.
#if defined(_M_X64)
OS << format(" (0x%016llX 0x%016llX 0x%016llX 0x%016llX)",
StackFrame.Params[0], StackFrame.Params[1], StackFrame.Params[2],
StackFrame.Params[3]);
#elif defined(_M_IX86)
OS << format(" (0x%08lX 0x%08lX 0x%08lX 0x%08lX)",
static_cast<DWORD>(StackFrame.Params[0]),
static_cast<DWORD>(StackFrame.Params[1]),
static_cast<DWORD>(StackFrame.Params[2]),
static_cast<DWORD>(StackFrame.Params[3]));
#endif
// Verify the PC belongs to a module in this process.
if (!fSymGetModuleBase64(hProcess, PC)) {
OS << " <unknown module>\n";
continue;
}
// Print the symbol name.
char buffer[512];
IMAGEHLP_SYMBOL64 *symbol = reinterpret_cast<IMAGEHLP_SYMBOL64 *>(buffer);
memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL64));
symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL64);
DWORD64 dwDisp;
if (!fSymGetSymFromAddr64(hProcess, PC, &dwDisp, symbol)) {
OS << '\n';
continue;
}
buffer[511] = 0;
if (dwDisp > 0)
OS << format(", %s() + 0x%llX bytes(s)", (const char*)symbol->Name,
dwDisp);
else
OS << format(", %s", (const char*)symbol->Name);
// Print the source file and line number information.
IMAGEHLP_LINE64 line = {};
DWORD dwLineDisp;
line.SizeOfStruct = sizeof(line);
if (fSymGetLineFromAddr64(hProcess, PC, &dwLineDisp, &line)) {
OS << format(", %s, line %lu", line.FileName, line.LineNumber);
if (dwLineDisp > 0)
OS << format(" + 0x%lX byte(s)", dwLineDisp);
}
OS << '\n';
}
}
namespace llvm {
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//=== and must not be UNIX code
//===----------------------------------------------------------------------===//
#ifdef _MSC_VER
/// AvoidMessageBoxHook - Emulates hitting "retry" from an "abort, retry,
/// ignore" CRT debug report dialog. "retry" raises an exception which
/// ultimately triggers our stack dumper.
static LLVM_ATTRIBUTE_UNUSED int
AvoidMessageBoxHook(int ReportType, char *Message, int *Return) {
// Set *Return to the retry code for the return value of _CrtDbgReport:
// http://msdn.microsoft.com/en-us/library/8hyw4sy7(v=vs.71).aspx
// This may also trigger just-in-time debugging via DebugBreak().
if (Return)
*Return = 1;
// Don't call _CrtDbgReport.
return TRUE;
}
#endif
extern "C" void HandleAbort(int Sig) {
if (Sig == SIGABRT) {
LLVM_BUILTIN_TRAP;
}
}
static void InitializeThreading() {
if (CriticalSectionInitialized)
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);
CriticalSectionInitialized = true;
}
static void RegisterHandler() {
// If we cannot load up the APIs (which would be unexpected as they should
// exist on every version of Windows we support), we will bail out since
// there would be nothing to report.
assert(load64BitDebugHelp() && "These APIs should always be available");
if (RegisteredUnhandledExceptionFilter) {
EnterCriticalSection(&CriticalSection);
return;
}
InitializeThreading();
// 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
bool sys::RemoveFileOnSignal(StringRef Filename, std::string* ErrMsg) {
RegisterHandler();
if (CleanupExecuted) {
if (ErrMsg)
*ErrMsg = "Process terminating -- cannot register for removal";
return true;
}
if (FilesToRemove == NULL)
FilesToRemove = new std::vector<std::string>;
FilesToRemove->push_back(Filename);
LeaveCriticalSection(&CriticalSection);
return false;
}
// DontRemoveFileOnSignal - The public API
void sys::DontRemoveFileOnSignal(StringRef Filename) {
if (FilesToRemove == NULL)
return;
RegisterHandler();
std::vector<std::string>::reverse_iterator I =
std::find(FilesToRemove->rbegin(), FilesToRemove->rend(), Filename);
if (I != FilesToRemove->rend())
FilesToRemove->erase(I.base()-1);
LeaveCriticalSection(&CriticalSection);
}
void sys::DisableSystemDialogsOnCrash() {
// Crash to stack trace handler on abort.
signal(SIGABRT, HandleAbort);
// The following functions are not reliably accessible on MinGW.
#ifdef _MSC_VER
// We're already handling writing a "something went wrong" message.
_set_abort_behavior(0, _WRITE_ABORT_MSG);
// Disable Dr. Watson.
_set_abort_behavior(0, _CALL_REPORTFAULT);
_CrtSetReportHook(AvoidMessageBoxHook);
#endif
// Disable standard error dialog box.
SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX |
SEM_NOOPENFILEERRORBOX);
_set_error_mode(_OUT_TO_STDERR);
}
/// 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(bool DisableCrashReporting) {
DisableSystemDialogsOnCrash();
RegisterHandler();
LeaveCriticalSection(&CriticalSection);
}
}
#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
// Provide a prototype for RtlCaptureContext, mingw32 from mingw.org is
// missing it but mingw-w64 has it.
extern "C" VOID WINAPI RtlCaptureContext(PCONTEXT ContextRecord);
#endif
void llvm::sys::PrintStackTrace(raw_ostream &OS) {
STACKFRAME64 StackFrame = {};
CONTEXT Context = {};
::RtlCaptureContext(&Context);
#if defined(_M_X64)
StackFrame.AddrPC.Offset = Context.Rip;
StackFrame.AddrStack.Offset = Context.Rsp;
StackFrame.AddrFrame.Offset = Context.Rbp;
#else
StackFrame.AddrPC.Offset = Context.Eip;
StackFrame.AddrStack.Offset = Context.Esp;
StackFrame.AddrFrame.Offset = Context.Ebp;
#endif
StackFrame.AddrPC.Mode = AddrModeFlat;
StackFrame.AddrStack.Mode = AddrModeFlat;
StackFrame.AddrFrame.Mode = AddrModeFlat;
PrintStackTraceForThread(OS, GetCurrentProcess(), GetCurrentThread(),
StackFrame, &Context);
}
void llvm::sys::SetInterruptFunction(void (*IF)()) {
RegisterHandler();
InterruptFunction = IF;
LeaveCriticalSection(&CriticalSection);
}
/// AddSignalHandler - Add a function to be called when a signal is delivered
/// to the process. The handler can have a cookie passed to it to identify
/// what instance of the handler it is.
void llvm::sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
RegisterHandler();
LeaveCriticalSection(&CriticalSection);
}
static void Cleanup() {
if (CleanupExecuted)
return;
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()) {
llvm::sys::fs::remove(FilesToRemove->back());
FilesToRemove->pop_back();
}
llvm::sys::RunSignalHandlers();
LeaveCriticalSection(&CriticalSection);
}
void llvm::sys::RunInterruptHandlers() {
// The interrupt handler may be called from an interrupt, but it may also be
// called manually (such as the case of report_fatal_error with no registered
// error handler). We must ensure that the critical section is properly
// initialized.
InitializeThreading();
Cleanup();
}
static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
Cleanup();
// Initialize the STACKFRAME structure.
STACKFRAME64 StackFrame = {};
#if defined(_M_X64)
StackFrame.AddrPC.Offset = ep->ContextRecord->Rip;
StackFrame.AddrPC.Mode = AddrModeFlat;
StackFrame.AddrStack.Offset = ep->ContextRecord->Rsp;
StackFrame.AddrStack.Mode = AddrModeFlat;
StackFrame.AddrFrame.Offset = ep->ContextRecord->Rbp;
StackFrame.AddrFrame.Mode = AddrModeFlat;
#elif defined(_M_IX86)
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;
#endif
HANDLE hProcess = GetCurrentProcess();
HANDLE hThread = GetCurrentThread();
PrintStackTraceForThread(llvm::errs(), hProcess, hThread, StackFrame,
ep->ContextRecord);
_exit(ep->ExceptionRecord->ExceptionCode);
}
static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
// We are running in our very own thread, courtesy of Windows.
EnterCriticalSection(&CriticalSection);
Cleanup();
// If an interrupt function has been set, go and run one it; otherwise,
// the process dies.
void (*IF)() = InterruptFunction;
InterruptFunction = 0; // Don't run it on another CTRL-C.
if (IF) {
// Note: if the interrupt function throws an exception, there is nothing
// to catch it in this thread so it will kill the process.
IF(); // Run it now.
LeaveCriticalSection(&CriticalSection);
return TRUE; // Don't kill the process.
}
// Allow normal processing to take place; i.e., the process dies.
LeaveCriticalSection(&CriticalSection);
return FALSE;
}
#if __MINGW32__
// We turned these warnings off for this file so that MinGW-g++ doesn't
// complain about the ll format specifiers used. Now we are turning the
// warnings back on. If MinGW starts to support diagnostic stacks, we can
// replace this with a pop.
#pragma GCC diagnostic warning "-Wformat"
#pragma GCC diagnostic warning "-Wformat-extra-args"
#endif
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