//===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Signals class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/ExitCodes.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/WindowsError.h"
#include <algorithm>
#include <io.h>
#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 "llvm/Support/Windows/WindowsSupport.h"
#ifdef __MINGW32__
#include <imagehlp.h>
#else
#include <crtdbg.h>
#include <dbghelp.h>
#endif
#include <psapi.h>
#ifdef _MSC_VER
#pragma comment(lib, "psapi.lib")
#elif __MINGW32__
// 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 *fpMiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
PMINIDUMP_EXCEPTION_INFORMATION,
PMINIDUMP_USER_STREAM_INFORMATION,
PMINIDUMP_CALLBACK_INFORMATION);
static fpMiniDumpWriteDump fMiniDumpWriteDump;
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 isDebugHelpInitialized() {
return fStackWalk64 && fSymInitialize && fSymSetOptions && fMiniDumpWriteDump;
}
static bool load64BitDebugHelp(void) {
HMODULE hLib =
::LoadLibraryExA("Dbghelp.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
if (hLib) {
fMiniDumpWriteDump = (fpMiniDumpWriteDump)(void *)::GetProcAddress(
hLib, "MiniDumpWriteDump");
fStackWalk64 = (fpStackWalk64)(void *)::GetProcAddress(hLib, "StackWalk64");
fSymGetModuleBase64 = (fpSymGetModuleBase64)(void *)::GetProcAddress(
hLib, "SymGetModuleBase64");
fSymGetSymFromAddr64 = (fpSymGetSymFromAddr64)(void *)::GetProcAddress(
hLib, "SymGetSymFromAddr64");
fSymGetLineFromAddr64 = (fpSymGetLineFromAddr64)(void *)::GetProcAddress(
hLib, "SymGetLineFromAddr64");
fSymGetModuleInfo64 = (fpSymGetModuleInfo64)(void *)::GetProcAddress(
hLib, "SymGetModuleInfo64");
fSymFunctionTableAccess64 =
(fpSymFunctionTableAccess64)(void *)::GetProcAddress(
hLib, "SymFunctionTableAccess64");
fSymSetOptions =
(fpSymSetOptions)(void *)::GetProcAddress(hLib, "SymSetOptions");
fSymInitialize =
(fpSymInitialize)(void *)::GetProcAddress(hLib, "SymInitialize");
fEnumerateLoadedModules =
(fpEnumerateLoadedModules)(void *)::GetProcAddress(
hLib, "EnumerateLoadedModules64");
}
return isDebugHelpInitialized();
}
using namespace llvm;
// Forward declare.
static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
// 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;
/// The function to call on "SIGPIPE" (one-time use only).
static std::atomic<void (*)()> OneShotPipeSignalFunction(nullptr);
// 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;
static StringRef Argv0;
enum {
#if defined(_M_X64)
NativeMachineType = IMAGE_FILE_MACHINE_AMD64
#elif defined(_M_ARM64)
NativeMachineType = IMAGE_FILE_MACHINE_ARM64
#elif defined(_M_IX86)
NativeMachineType = IMAGE_FILE_MACHINE_I386
#elif defined(_M_ARM)
NativeMachineType = IMAGE_FILE_MACHINE_ARMNT
#else
NativeMachineType = IMAGE_FILE_MACHINE_UNKNOWN
#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 >= std::size(StackTrace))
break;
}
return printSymbolizedStackTrace(Argv0, &StackTrace[0], Depth, OS);
}
namespace {
struct FindModuleData {
void **StackTrace;
int Depth;
const char **Modules;
intptr_t *Offsets;
StringSaver *StrPool;
};
} // namespace
static BOOL CALLBACK findModuleCallback(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();
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 bool printMarkupContext(llvm::raw_ostream &OS,
const char *MainExecutableName) {
return false;
}
static void PrintStackTraceForThread(llvm::raw_ostream &OS, HANDLE hProcess,
HANDLE hThread, STACKFRAME64 &StackFrame,
CONTEXT *Context) {
// It's possible that DbgHelp.dll hasn't been loaded yet (e.g. if this
// function is called before the main program called `llvm::InitLLVM`).
// In this case just return, not stacktrace will be printed.
if (!isDebugHelpInitialized())
return;
// 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) || defined(_M_ARM64)
OS << format("0x%016llX", PC);
#elif defined(_M_IX86) || defined(_M_ARM)
OS << format("0x%08lX", static_cast<DWORD>(PC));
#endif
// Verify the PC belongs to a module in this process.
if (!fSymGetModuleBase64(hProcess, PC)) {
OS << " <unknown module>\n";
continue;
}
IMAGEHLP_MODULE64 M;
memset(&M, 0, sizeof(IMAGEHLP_MODULE64));
M.SizeOfStruct = sizeof(IMAGEHLP_MODULE64);
if (fSymGetModuleInfo64(hProcess, fSymGetModuleBase64(hProcess, PC), &M)) {
DWORD64 const disp = PC - M.BaseOfImage;
OS << format(", %s(0x%016llX) + 0x%llX byte(s)",
static_cast<char *>(M.ImageName), M.BaseOfImage,
static_cast<long long>(disp));
} else {
OS << ", <unknown module>";
}
// 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;
OS << format(", %s() + 0x%llX byte(s)", static_cast<char *>(symbol->Name),
static_cast<long long>(dwDisp));
// 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 + 0x%lX byte(s)", line.FileName,
line.LineNumber, dwLineDisp);
}
OS << '\n';
}
}
namespace llvm {
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//=== and must not be UNIX code
//===----------------------------------------------------------------------===//
#ifdef _MSC_VER
/// 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.
if (!load64BitDebugHelp()) {
assert(false && "These APIs should always be available");
return;
}
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.
}
// 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(std::string(Filename));
LeaveCriticalSection(&CriticalSection);
return false;
}
// The public API
void sys::DontRemoveFileOnSignal(StringRef Filename) {
if (FilesToRemove == NULL)
return;
RegisterHandler();
std::vector<std::string>::reverse_iterator I =
find(reverse(*FilesToRemove), 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);
}
/// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
/// process, print a stack trace and then exit.
void sys::PrintStackTraceOnErrorSignal(StringRef Argv0,
bool DisableCrashReporting) {
::Argv0 = Argv0;
if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT"))
Process::PreventCoreFiles();
DisableSystemDialogsOnCrash();
RegisterHandler();
LeaveCriticalSection(&CriticalSection);
}
} // namespace llvm
#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
static void LocalPrintStackTrace(raw_ostream &OS, PCONTEXT C) {
STACKFRAME64 StackFrame{};
CONTEXT Context{};
if (!C) {
::RtlCaptureContext(&Context);
C = &Context;
}
#if defined(_M_X64)
StackFrame.AddrPC.Offset = Context.Rip;
StackFrame.AddrStack.Offset = Context.Rsp;
StackFrame.AddrFrame.Offset = Context.Rbp;
#elif defined(_M_IX86)
StackFrame.AddrPC.Offset = Context.Eip;
StackFrame.AddrStack.Offset = Context.Esp;
StackFrame.AddrFrame.Offset = Context.Ebp;
#elif defined(_M_ARM64)
StackFrame.AddrPC.Offset = Context.Pc;
StackFrame.AddrStack.Offset = Context.Sp;
StackFrame.AddrFrame.Offset = Context.Fp;
#elif defined(_M_ARM)
StackFrame.AddrPC.Offset = Context.Pc;
StackFrame.AddrStack.Offset = Context.Sp;
StackFrame.AddrFrame.Offset = Context.R11;
#endif
StackFrame.AddrPC.Mode = AddrModeFlat;
StackFrame.AddrStack.Mode = AddrModeFlat;
StackFrame.AddrFrame.Mode = AddrModeFlat;
PrintStackTraceForThread(OS, GetCurrentProcess(), GetCurrentThread(),
StackFrame, C);
}
void llvm::sys::PrintStackTrace(raw_ostream &OS, int Depth) {
// FIXME: Handle "Depth" parameter to print stack trace upto specified Depth
LocalPrintStackTrace(OS, nullptr);
}
void llvm::sys::SetInterruptFunction(void (*IF)()) {
RegisterHandler();
InterruptFunction = IF;
LeaveCriticalSection(&CriticalSection);
}
void llvm::sys::SetInfoSignalFunction(void (*Handler)()) {
// Unimplemented.
}
void llvm::sys::SetOneShotPipeSignalFunction(void (*Handler)()) {
OneShotPipeSignalFunction.exchange(Handler);
}
void llvm::sys::DefaultOneShotPipeSignalHandler() {
llvm::sys::Process::Exit(EX_IOERR, /*NoCleanup=*/true);
}
void llvm::sys::CallOneShotPipeSignalHandler() {
if (auto OldOneShotPipeFunction = OneShotPipeSignalFunction.exchange(nullptr))
OldOneShotPipeFunction();
}
/// 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(sys::SignalHandlerCallback FnPtr,
void *Cookie) {
insertSignalHandler(FnPtr, Cookie);
RegisterHandler();
LeaveCriticalSection(&CriticalSection);
}
static void Cleanup(bool ExecuteSignalHandlers) {
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();
}
if (ExecuteSignalHandlers)
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(true);
}
/// Find the Windows Registry Key for a given location.
///
/// \returns a valid HKEY if the location exists, else NULL.
static HKEY FindWERKey(const llvm::Twine &RegistryLocation) {
HKEY Key;
if (ERROR_SUCCESS != ::RegOpenKeyExA(HKEY_LOCAL_MACHINE,
RegistryLocation.str().c_str(), 0,
KEY_QUERY_VALUE | KEY_READ, &Key))
return NULL;
return Key;
}
/// Populate ResultDirectory with the value for "DumpFolder" for a given
/// Windows Registry key.
///
/// \returns true if a valid value for DumpFolder exists, false otherwise.
static bool GetDumpFolder(HKEY Key,
llvm::SmallVectorImpl<char> &ResultDirectory) {
using llvm::sys::windows::UTF16ToUTF8;
if (!Key)
return false;
DWORD BufferLengthBytes = 0;
if (ERROR_SUCCESS != ::RegGetValueW(Key, 0, L"DumpFolder", REG_EXPAND_SZ,
NULL, NULL, &BufferLengthBytes))
return false;
SmallVector<wchar_t, MAX_PATH> Buffer(BufferLengthBytes);
if (ERROR_SUCCESS != ::RegGetValueW(Key, 0, L"DumpFolder", REG_EXPAND_SZ,
NULL, Buffer.data(), &BufferLengthBytes))
return false;
DWORD ExpandBufferSize = ::ExpandEnvironmentStringsW(Buffer.data(), NULL, 0);
if (!ExpandBufferSize)
return false;
SmallVector<wchar_t, MAX_PATH> ExpandBuffer(ExpandBufferSize);
if (ExpandBufferSize != ::ExpandEnvironmentStringsW(Buffer.data(),
ExpandBuffer.data(),
ExpandBufferSize))
return false;
if (UTF16ToUTF8(ExpandBuffer.data(), ExpandBufferSize - 1, ResultDirectory))
return false;
return true;
}
/// Populate ResultType with a valid MINIDUMP_TYPE based on the value of
/// "DumpType" for a given Windows Registry key.
///
/// According to
/// https://msdn.microsoft.com/en-us/library/windows/desktop/bb787181(v=vs.85).aspx
/// valid values for DumpType are:
/// * 0: Custom dump
/// * 1: Mini dump
/// * 2: Full dump
/// If "Custom dump" is specified then the "CustomDumpFlags" field is read
/// containing a bitwise combination of MINIDUMP_TYPE values.
///
/// \returns true if a valid value for ResultType can be set, false otherwise.
static bool GetDumpType(HKEY Key, MINIDUMP_TYPE &ResultType) {
if (!Key)
return false;
DWORD DumpType;
DWORD TypeSize = sizeof(DumpType);
if (ERROR_SUCCESS != ::RegGetValueW(Key, NULL, L"DumpType", RRF_RT_REG_DWORD,
NULL, &DumpType, &TypeSize))
return false;
switch (DumpType) {
case 0: {
DWORD Flags = 0;
if (ERROR_SUCCESS != ::RegGetValueW(Key, NULL, L"CustomDumpFlags",
RRF_RT_REG_DWORD, NULL, &Flags,
&TypeSize))
return false;
ResultType = static_cast<MINIDUMP_TYPE>(Flags);
break;
}
case 1:
ResultType = MiniDumpNormal;
break;
case 2:
ResultType = MiniDumpWithFullMemory;
break;
default:
return false;
}
return true;
}
/// Write a Windows dump file containing process information that can be
/// used for post-mortem debugging.
///
/// \returns zero error code if a mini dump created, actual error code
/// otherwise.
static std::error_code WINAPI
WriteWindowsDumpFile(PMINIDUMP_EXCEPTION_INFORMATION ExceptionInfo) {
struct ScopedCriticalSection {
ScopedCriticalSection() { EnterCriticalSection(&CriticalSection); }
~ScopedCriticalSection() { LeaveCriticalSection(&CriticalSection); }
} SCS;
using namespace llvm;
using namespace llvm::sys;
std::string MainExecutableName = fs::getMainExecutable(nullptr, nullptr);
StringRef ProgramName;
if (MainExecutableName.empty()) {
// If we can't get the executable filename,
// things are in worse shape than we realize
// and we should just bail out.
return mapWindowsError(::GetLastError());
}
ProgramName = path::filename(MainExecutableName.c_str());
// The Windows Registry location as specified at
// https://msdn.microsoft.com/en-us/library/windows/desktop/bb787181%28v=vs.85%29.aspx
// "Collecting User-Mode Dumps" that may optionally be set to collect crash
// dumps in a specified location.
StringRef LocalDumpsRegistryLocation =
"SOFTWARE\\Microsoft\\Windows\\Windows Error Reporting\\LocalDumps";
// The key pointing to the Registry location that may contain global crash
// dump settings. This will be NULL if the location can not be found.
ScopedRegHandle DefaultLocalDumpsKey(FindWERKey(LocalDumpsRegistryLocation));
// The key pointing to the Registry location that may contain
// application-specific crash dump settings. This will be NULL if the
// location can not be found.
ScopedRegHandle AppSpecificKey(
FindWERKey(Twine(LocalDumpsRegistryLocation) + "\\" + ProgramName));
// Look to see if a dump type is specified in the registry; first with the
// app-specific key and failing that with the global key. If none are found
// default to a normal dump (GetDumpType will return false either if the key
// is NULL or if there is no valid DumpType value at its location).
MINIDUMP_TYPE DumpType;
if (!GetDumpType(AppSpecificKey, DumpType))
if (!GetDumpType(DefaultLocalDumpsKey, DumpType))
DumpType = MiniDumpNormal;
// Look to see if a dump location is specified on the command line. If not,
// look to see if a dump location is specified in the registry; first with the
// app-specific key and failing that with the global key. If none are found
// we'll just create the dump file in the default temporary file location
// (GetDumpFolder will return false either if the key is NULL or if there is
// no valid DumpFolder value at its location).
bool ExplicitDumpDirectorySet = true;
SmallString<MAX_PATH> DumpDirectory(*CrashDiagnosticsDirectory);
if (DumpDirectory.empty())
if (!GetDumpFolder(AppSpecificKey, DumpDirectory))
if (!GetDumpFolder(DefaultLocalDumpsKey, DumpDirectory))
ExplicitDumpDirectorySet = false;
int FD;
SmallString<MAX_PATH> DumpPath;
if (ExplicitDumpDirectorySet) {
if (std::error_code EC = fs::create_directories(DumpDirectory))
return EC;
if (std::error_code EC = fs::createUniqueFile(
Twine(DumpDirectory) + "\\" + ProgramName + ".%%%%%%.dmp", FD,
DumpPath))
return EC;
} else if (std::error_code EC =
fs::createTemporaryFile(ProgramName, "dmp", FD, DumpPath))
return EC;
// Our support functions return a file descriptor but Windows wants a handle.
ScopedCommonHandle FileHandle(reinterpret_cast<HANDLE>(_get_osfhandle(FD)));
if (!fMiniDumpWriteDump(::GetCurrentProcess(), ::GetCurrentProcessId(),
FileHandle, DumpType, ExceptionInfo, NULL, NULL))
return mapWindowsError(::GetLastError());
llvm::errs() << "Wrote crash dump file \"" << DumpPath << "\"\n";
return std::error_code();
}
void sys::CleanupOnSignal(uintptr_t Context) {
LPEXCEPTION_POINTERS EP = (LPEXCEPTION_POINTERS)Context;
// Broken pipe is not a crash.
//
// 0xE0000000 is combined with the return code in the exception raised in
// CrashRecoveryContext::HandleExit().
unsigned RetCode = EP->ExceptionRecord->ExceptionCode;
if (RetCode == (0xE0000000 | EX_IOERR))
return;
LLVMUnhandledExceptionFilter(EP);
}
static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
Cleanup(true);
// Write out the exception code.
if (ep && ep->ExceptionRecord)
llvm::errs() << format("Exception Code: 0x%08X",
ep->ExceptionRecord->ExceptionCode)
<< "\n";
// We'll automatically write a Minidump file here to help diagnose
// the nasty sorts of crashes that aren't 100% reproducible from a set of
// inputs (or in the event that the user is unable or unwilling to provide a
// reproducible case).
if (!llvm::sys::Process::AreCoreFilesPrevented()) {
MINIDUMP_EXCEPTION_INFORMATION ExceptionInfo;
ExceptionInfo.ThreadId = ::GetCurrentThreadId();
ExceptionInfo.ExceptionPointers = ep;
ExceptionInfo.ClientPointers = FALSE;
if (std::error_code EC = WriteWindowsDumpFile(&ExceptionInfo))
llvm::errs() << "Could not write crash dump file: " << EC.message()
<< "\n";
}
// Stack unwinding appears to modify the context. Copy it to preserve the
// caller's context.
CONTEXT ContextCopy;
if (ep)
memcpy(&ContextCopy, ep->ContextRecord, sizeof(ContextCopy));
LocalPrintStackTrace(llvm::errs(), ep ? &ContextCopy : nullptr);
return EXCEPTION_EXECUTE_HANDLER;
}
static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
// We are running in our very own thread, courtesy of Windows.
EnterCriticalSection(&CriticalSection);
// This function is only ever called when a CTRL-C or similar control signal
// is fired. Killing a process in this way is normal, so don't trigger the
// signal handlers.
Cleanup(false);
// 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
void sys::unregisterHandlers() {}
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