libsanitizer/sanitizer_common/sanitizer_win.cc - native_client/nacl-gcc - Git at Google

 //===-- sanitizer_win.cc --------------------------------------------------===//
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is shared between AddressSanitizer and ThreadSanitizer
 // run-time libraries and implements windows-specific functions from
 // sanitizer_libc.h.
 //===----------------------------------------------------------------------===//

 #include "sanitizer_platform.h"
 #if SANITIZER_WINDOWS

 #define WIN32_LEAN_AND_MEAN
 #define NOGDI
 #include <stdlib.h>
 #include <io.h>
 #include <windows.h>

 #include "sanitizer_common.h"
 #include "sanitizer_libc.h"
 #include "sanitizer_mutex.h"
 #include "sanitizer_placement_new.h"
 #include "sanitizer_stacktrace.h"

 namespace __sanitizer {

 #include "sanitizer_syscall_generic.inc"

 // --------------------- sanitizer_common.h
 uptr GetPageSize() {
   return 1U << 14;  // FIXME: is this configurable?
 }

 uptr GetMmapGranularity() {
   return 1U << 16;  // FIXME: is this configurable?
 }

 uptr GetMaxVirtualAddress() {
   SYSTEM_INFO si;
   GetSystemInfo(&si);
   return (uptr)si.lpMaximumApplicationAddress;
 }

 bool FileExists(const char *filename) {
   UNIMPLEMENTED();
 }

 uptr internal_getpid() {
   return GetProcessId(GetCurrentProcess());
 }

 // In contrast to POSIX, on Windows GetCurrentThreadId()
 // returns a system-unique identifier.
 uptr GetTid() {
   return GetCurrentThreadId();
 }

 uptr GetThreadSelf() {
   return GetTid();
 }

 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
                                 uptr *stack_bottom) {
   CHECK(stack_top);
   CHECK(stack_bottom);
   MEMORY_BASIC_INFORMATION mbi;
   CHECK_NE(VirtualQuery(&mbi /* on stack */, &mbi, sizeof(mbi)), 0);
   // FIXME: is it possible for the stack to not be a single allocation?
   // Are these values what ASan expects to get (reserved, not committed;
   // including stack guard page) ?
   *stack_top = (uptr)mbi.BaseAddress + mbi.RegionSize;
   *stack_bottom = (uptr)mbi.AllocationBase;
 }

 void *MmapOrDie(uptr size, const char *mem_type) {
   void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
   if (rv == 0) {
     Report("ERROR: %s failed to "
            "allocate 0x%zx (%zd) bytes of %s (error code: %d)\n",
            SanitizerToolName, size, size, mem_type, GetLastError());
     CHECK("unable to mmap" && 0);
   }
   return rv;
 }

 void UnmapOrDie(void *addr, uptr size) {
   if (VirtualFree(addr, size, MEM_DECOMMIT) == 0) {
     Report("ERROR: %s failed to "
            "deallocate 0x%zx (%zd) bytes at address %p (error code: %d)\n",
            SanitizerToolName, size, size, addr, GetLastError());
     CHECK("unable to unmap" && 0);
   }
 }

 void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
   // FIXME: is this really "NoReserve"? On Win32 this does not matter much,
   // but on Win64 it does.
   void *p = VirtualAlloc((LPVOID)fixed_addr, size,
       MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
   if (p == 0)
     Report("ERROR: %s failed to "
            "allocate %p (%zd) bytes at %p (error code: %d)\n",
            SanitizerToolName, size, size, fixed_addr, GetLastError());
   return p;
 }

 void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
   return MmapFixedNoReserve(fixed_addr, size);
 }

 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
   // FIXME: make this really NoReserve?
   return MmapOrDie(size, mem_type);
 }

 void *Mprotect(uptr fixed_addr, uptr size) {
   return VirtualAlloc((LPVOID)fixed_addr, size,
                       MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS);
 }

 void FlushUnneededShadowMemory(uptr addr, uptr size) {
   // This is almost useless on 32-bits.
   // FIXME: add madvice-analog when we move to 64-bits.
 }

 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
   // FIXME: shall we do anything here on Windows?
   return true;
 }

 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
   UNIMPLEMENTED();
 }

 static const int kMaxEnvNameLength = 128;
 static const DWORD kMaxEnvValueLength = 32767;

 namespace {

 struct EnvVariable {
   char name[kMaxEnvNameLength];
   char value[kMaxEnvValueLength];
 };

 }  // namespace

 static const int kEnvVariables = 5;
 static EnvVariable env_vars[kEnvVariables];
 static int num_env_vars;

 const char *GetEnv(const char *name) {
   // Note: this implementation caches the values of the environment variables
   // and limits their quantity.
   for (int i = 0; i < num_env_vars; i++) {
     if (0 == internal_strcmp(name, env_vars[i].name))
       return env_vars[i].value;
   }
   CHECK_LT(num_env_vars, kEnvVariables);
   DWORD rv = GetEnvironmentVariableA(name, env_vars[num_env_vars].value,
                                      kMaxEnvValueLength);
   if (rv > 0 && rv < kMaxEnvValueLength) {
     CHECK_LT(internal_strlen(name), kMaxEnvNameLength);
     internal_strncpy(env_vars[num_env_vars].name, name, kMaxEnvNameLength);
     num_env_vars++;
     return env_vars[num_env_vars - 1].value;
   }
   return 0;
 }

 const char *GetPwd() {
   UNIMPLEMENTED();
 }

 u32 GetUid() {
   UNIMPLEMENTED();
 }

 void DumpProcessMap() {
   UNIMPLEMENTED();
 }

 void DisableCoreDumper() {
   // Do nothing.
 }

 void ReExec() {
   UNIMPLEMENTED();
 }

 void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
   (void)args;
   // Nothing here for now.
 }

 bool StackSizeIsUnlimited() {
   UNIMPLEMENTED();
 }

 void SetStackSizeLimitInBytes(uptr limit) {
   UNIMPLEMENTED();
 }

 char *FindPathToBinary(const char *name) {
   // Nothing here for now.
   return 0;
 }

 void SleepForSeconds(int seconds) {
   Sleep(seconds * 1000);
 }

 void SleepForMillis(int millis) {
   Sleep(millis);
 }

 u64 NanoTime() {
   return 0;
 }

 void Abort() {
   abort();
   internal__exit(-1);  // abort is not NORETURN on Windows.
 }

 uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
                       string_predicate_t filter) {
   UNIMPLEMENTED();
 };

 #ifndef SANITIZER_GO
 int Atexit(void (*function)(void)) {
   return atexit(function);
 }
 #endif

 // ------------------ sanitizer_libc.h
 uptr internal_mmap(void *addr, uptr length, int prot, int flags,
                    int fd, u64 offset) {
   UNIMPLEMENTED();
 }

 uptr internal_munmap(void *addr, uptr length) {
   UNIMPLEMENTED();
 }

 uptr internal_close(fd_t fd) {
   UNIMPLEMENTED();
 }

 int internal_isatty(fd_t fd) {
   return _isatty(fd);
 }

 uptr internal_open(const char *filename, int flags) {
   UNIMPLEMENTED();
 }

 uptr internal_open(const char *filename, int flags, u32 mode) {
   UNIMPLEMENTED();
 }

 uptr OpenFile(const char *filename, bool write) {
   UNIMPLEMENTED();
 }

 uptr internal_read(fd_t fd, void *buf, uptr count) {
   UNIMPLEMENTED();
 }

 uptr internal_write(fd_t fd, const void *buf, uptr count) {
   if (fd != kStderrFd)
     UNIMPLEMENTED();

   static HANDLE output_stream = 0;
   // Abort immediately if we know printing is not possible.
   if (output_stream == INVALID_HANDLE_VALUE)
     return 0;

   // If called for the first time, try to use stderr to output stuff,
   // falling back to stdout if anything goes wrong.
   bool fallback_to_stdout = false;
   if (output_stream == 0) {
     output_stream = GetStdHandle(STD_ERROR_HANDLE);
     // We don't distinguish "no such handle" from error.
     if (output_stream == 0)
       output_stream = INVALID_HANDLE_VALUE;

     if (output_stream == INVALID_HANDLE_VALUE) {
       // Retry with stdout?
       output_stream = GetStdHandle(STD_OUTPUT_HANDLE);
       if (output_stream == 0)
         output_stream = INVALID_HANDLE_VALUE;
       if (output_stream == INVALID_HANDLE_VALUE)
         return 0;
     } else {
       // Successfully got an stderr handle.  However, if WriteFile() fails,
       // we can still try to fallback to stdout.
       fallback_to_stdout = true;
     }
   }

   DWORD ret;
   if (WriteFile(output_stream, buf, count, &ret, 0))
     return ret;

   // Re-try with stdout if using a valid stderr handle fails.
   if (fallback_to_stdout) {
     output_stream = GetStdHandle(STD_OUTPUT_HANDLE);
     if (output_stream == 0)
       output_stream = INVALID_HANDLE_VALUE;
     if (output_stream != INVALID_HANDLE_VALUE)
       return internal_write(fd, buf, count);
   }
   return 0;
 }

 uptr internal_stat(const char *path, void *buf) {
   UNIMPLEMENTED();
 }

 uptr internal_lstat(const char *path, void *buf) {
   UNIMPLEMENTED();
 }

 uptr internal_fstat(fd_t fd, void *buf) {
   UNIMPLEMENTED();
 }

 uptr internal_filesize(fd_t fd) {
   UNIMPLEMENTED();
 }

 uptr internal_dup2(int oldfd, int newfd) {
   UNIMPLEMENTED();
 }

 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
   UNIMPLEMENTED();
 }

 uptr internal_sched_yield() {
   Sleep(0);
   return 0;
 }

 void internal__exit(int exitcode) {
   ExitProcess(exitcode);
 }

 // ---------------------- BlockingMutex ---------------- {{{1
 const uptr LOCK_UNINITIALIZED = 0;
 const uptr LOCK_READY = (uptr)-1;

 BlockingMutex::BlockingMutex(LinkerInitialized li) {
   // FIXME: see comments in BlockingMutex::Lock() for the details.
   CHECK(li == LINKER_INITIALIZED || owner_ == LOCK_UNINITIALIZED);

   CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
   InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
   owner_ = LOCK_READY;
 }

 BlockingMutex::BlockingMutex() {
   CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
   InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
   owner_ = LOCK_READY;
 }

 void BlockingMutex::Lock() {
   if (owner_ == LOCK_UNINITIALIZED) {
     // FIXME: hm, global BlockingMutex objects are not initialized?!?
     // This might be a side effect of the clang+cl+link Frankenbuild...
     new(this) BlockingMutex((LinkerInitialized)(LINKER_INITIALIZED + 1));

     // FIXME: If it turns out the linker doesn't invoke our
     // constructors, we should probably manually Lock/Unlock all the global
     // locks while we're starting in one thread to avoid double-init races.
   }
   EnterCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
   CHECK_EQ(owner_, LOCK_READY);
   owner_ = GetThreadSelf();
 }

 void BlockingMutex::Unlock() {
   CHECK_EQ(owner_, GetThreadSelf());
   owner_ = LOCK_READY;
   LeaveCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
 }

 void BlockingMutex::CheckLocked() {
   CHECK_EQ(owner_, GetThreadSelf());
 }

 uptr GetTlsSize() {
   return 0;
 }

 void InitTlsSize() {
 }

 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
                           uptr *tls_addr, uptr *tls_size) {
 #ifdef SANITIZER_GO
   *stk_addr = 0;
   *stk_size = 0;
   *tls_addr = 0;
   *tls_size = 0;
 #else
   uptr stack_top, stack_bottom;
   GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
   *stk_addr = stack_bottom;
   *stk_size = stack_top - stack_bottom;
   *tls_addr = 0;
   *tls_size = 0;
 #endif
 }

 void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
   CHECK_GE(max_depth, 2);
   // FIXME: CaptureStackBackTrace might be too slow for us.
   // FIXME: Compare with StackWalk64.
   // FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
   size = CaptureStackBackTrace(2, Min(max_depth, kStackTraceMax),
                                (void**)trace, 0);
   if (size == 0)
     return;

   // Skip the RTL frames by searching for the PC in the stacktrace.
   uptr pc_location = LocatePcInTrace(pc);
   PopStackFrames(pc_location);
 }

 void StackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
                                             uptr max_depth) {
   UNREACHABLE("no signal context on windows");
 }

 void MaybeOpenReportFile() {
   // Windows doesn't have native fork, and we don't support Cygwin or other
   // environments that try to fake it, so the initial report_fd will always be
   // correct.
 }

 void RawWrite(const char *buffer) {
   uptr length = (uptr)internal_strlen(buffer);
   if (length != internal_write(report_fd, buffer, length)) {
     // stderr may be closed, but we may be able to print to the debugger
     // instead.  This is the case when launching a program from Visual Studio,
     // and the following routine should write to its console.
     OutputDebugStringA(buffer);
   }
 }

 void SetAlternateSignalStack() {
   // FIXME: Decide what to do on Windows.
 }

 void UnsetAlternateSignalStack() {
   // FIXME: Decide what to do on Windows.
 }

 void InstallDeadlySignalHandlers(SignalHandlerType handler) {
   (void)handler;
   // FIXME: Decide what to do on Windows.
 }

 bool IsDeadlySignal(int signum) {
   // FIXME: Decide what to do on Windows.
   return false;
 }

 }  // namespace __sanitizer

 #endif  // _WIN32
	//===-- sanitizer_win.cc --------------------------------------------------===//
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file is shared between AddressSanitizer and ThreadSanitizer
	// run-time libraries and implements windows-specific functions from
	// sanitizer_libc.h.
	//===----------------------------------------------------------------------===//

	#include "sanitizer_platform.h"
	#if SANITIZER_WINDOWS

	#define WIN32_LEAN_AND_MEAN
	#define NOGDI
	#include <stdlib.h>
	#include <io.h>
	#include <windows.h>

	#include "sanitizer_common.h"
	#include "sanitizer_libc.h"
	#include "sanitizer_mutex.h"
	#include "sanitizer_placement_new.h"
	#include "sanitizer_stacktrace.h"

	namespace __sanitizer {

	#include "sanitizer_syscall_generic.inc"

	// --------------------- sanitizer_common.h
	uptr GetPageSize() {
	return 1U << 14; // FIXME: is this configurable?
	}

	uptr GetMmapGranularity() {
	return 1U << 16; // FIXME: is this configurable?
	}

	uptr GetMaxVirtualAddress() {
	SYSTEM_INFO si;
	GetSystemInfo(&si);
	return (uptr)si.lpMaximumApplicationAddress;
	}

	bool FileExists(const char *filename) {
	UNIMPLEMENTED();
	}

	uptr internal_getpid() {
	return GetProcessId(GetCurrentProcess());
	}

	// In contrast to POSIX, on Windows GetCurrentThreadId()
	// returns a system-unique identifier.
	uptr GetTid() {
	return GetCurrentThreadId();
	}

	uptr GetThreadSelf() {
	return GetTid();
	}

	void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
	uptr *stack_bottom) {
	CHECK(stack_top);
	CHECK(stack_bottom);
	MEMORY_BASIC_INFORMATION mbi;
	CHECK_NE(VirtualQuery(&mbi /* on stack */, &mbi, sizeof(mbi)), 0);
	// FIXME: is it possible for the stack to not be a single allocation?
	// Are these values what ASan expects to get (reserved, not committed;
	// including stack guard page) ?
	*stack_top = (uptr)mbi.BaseAddress + mbi.RegionSize;
	*stack_bottom = (uptr)mbi.AllocationBase;
	}

	void MmapOrDie(uptr size, const char mem_type) {
	void *rv = VirtualAlloc(0, size, MEM_RESERVE \| MEM_COMMIT, PAGE_READWRITE);
	if (rv == 0) {
	Report("ERROR: %s failed to "
	"allocate 0x%zx (%zd) bytes of %s (error code: %d)\n",
	SanitizerToolName, size, size, mem_type, GetLastError());
	CHECK("unable to mmap" && 0);
	}
	return rv;
	}

	void UnmapOrDie(void *addr, uptr size) {
	if (VirtualFree(addr, size, MEM_DECOMMIT) == 0) {
	Report("ERROR: %s failed to "
	"deallocate 0x%zx (%zd) bytes at address %p (error code: %d)\n",
	SanitizerToolName, size, size, addr, GetLastError());
	CHECK("unable to unmap" && 0);
	}
	}

	void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
	// FIXME: is this really "NoReserve"? On Win32 this does not matter much,
	// but on Win64 it does.
	void *p = VirtualAlloc((LPVOID)fixed_addr, size,
	MEM_RESERVE \| MEM_COMMIT, PAGE_READWRITE);
	if (p == 0)
	Report("ERROR: %s failed to "
	"allocate %p (%zd) bytes at %p (error code: %d)\n",
	SanitizerToolName, size, size, fixed_addr, GetLastError());
	return p;
	}

	void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
	return MmapFixedNoReserve(fixed_addr, size);
	}

	void MmapNoReserveOrDie(uptr size, const char mem_type) {
	// FIXME: make this really NoReserve?
	return MmapOrDie(size, mem_type);
	}

	void *Mprotect(uptr fixed_addr, uptr size) {
	return VirtualAlloc((LPVOID)fixed_addr, size,
	MEM_RESERVE \| MEM_COMMIT, PAGE_NOACCESS);
	}

	void FlushUnneededShadowMemory(uptr addr, uptr size) {
	// This is almost useless on 32-bits.
	// FIXME: add madvice-analog when we move to 64-bits.
	}

	bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
	// FIXME: shall we do anything here on Windows?
	return true;
	}

	void MapFileToMemory(const char file_name, uptr *buff_size) {
	UNIMPLEMENTED();
	}

	static const int kMaxEnvNameLength = 128;
	static const DWORD kMaxEnvValueLength = 32767;

	namespace {

	struct EnvVariable {
	char name[kMaxEnvNameLength];
	char value[kMaxEnvValueLength];
	};

	} // namespace

	static const int kEnvVariables = 5;
	static EnvVariable env_vars[kEnvVariables];
	static int num_env_vars;

	const char GetEnv(const char name) {
	// Note: this implementation caches the values of the environment variables
	// and limits their quantity.
	for (int i = 0; i < num_env_vars; i++) {
	if (0 == internal_strcmp(name, env_vars[i].name))
	return env_vars[i].value;
	}
	CHECK_LT(num_env_vars, kEnvVariables);
	DWORD rv = GetEnvironmentVariableA(name, env_vars[num_env_vars].value,
	kMaxEnvValueLength);
	if (rv > 0 && rv < kMaxEnvValueLength) {
	CHECK_LT(internal_strlen(name), kMaxEnvNameLength);
	internal_strncpy(env_vars[num_env_vars].name, name, kMaxEnvNameLength);
	num_env_vars++;
	return env_vars[num_env_vars - 1].value;
	}
	return 0;
	}

	const char *GetPwd() {
	UNIMPLEMENTED();
	}

	u32 GetUid() {
	UNIMPLEMENTED();
	}

	void DumpProcessMap() {
	UNIMPLEMENTED();
	}

	void DisableCoreDumper() {
	// Do nothing.
	}

	void ReExec() {
	UNIMPLEMENTED();
	}

	void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
	(void)args;
	// Nothing here for now.
	}

	bool StackSizeIsUnlimited() {
	UNIMPLEMENTED();
	}

	void SetStackSizeLimitInBytes(uptr limit) {
	UNIMPLEMENTED();
	}

	char FindPathToBinary(const char name) {
	// Nothing here for now.
	return 0;
	}

	void SleepForSeconds(int seconds) {
	Sleep(seconds * 1000);
	}

	void SleepForMillis(int millis) {
	Sleep(millis);
	}

	u64 NanoTime() {
	return 0;
	}

	void Abort() {
	abort();
	internal__exit(-1); // abort is not NORETURN on Windows.
	}

	uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
	string_predicate_t filter) {
	UNIMPLEMENTED();
	};

	#ifndef SANITIZER_GO
	int Atexit(void (*function)(void)) {
	return atexit(function);
	}
	#endif

	// ------------------ sanitizer_libc.h
	uptr internal_mmap(void *addr, uptr length, int prot, int flags,
	int fd, u64 offset) {
	UNIMPLEMENTED();
	}

	uptr internal_munmap(void *addr, uptr length) {
	UNIMPLEMENTED();
	}

	uptr internal_close(fd_t fd) {
	UNIMPLEMENTED();
	}

	int internal_isatty(fd_t fd) {
	return _isatty(fd);
	}

	uptr internal_open(const char *filename, int flags) {
	UNIMPLEMENTED();
	}

	uptr internal_open(const char *filename, int flags, u32 mode) {
	UNIMPLEMENTED();
	}

	uptr OpenFile(const char *filename, bool write) {
	UNIMPLEMENTED();
	}

	uptr internal_read(fd_t fd, void *buf, uptr count) {
	UNIMPLEMENTED();
	}

	uptr internal_write(fd_t fd, const void *buf, uptr count) {
	if (fd != kStderrFd)
	UNIMPLEMENTED();

	static HANDLE output_stream = 0;
	// Abort immediately if we know printing is not possible.
	if (output_stream == INVALID_HANDLE_VALUE)
	return 0;

	// If called for the first time, try to use stderr to output stuff,
	// falling back to stdout if anything goes wrong.
	bool fallback_to_stdout = false;
	if (output_stream == 0) {
	output_stream = GetStdHandle(STD_ERROR_HANDLE);
	// We don't distinguish "no such handle" from error.
	if (output_stream == 0)
	output_stream = INVALID_HANDLE_VALUE;

	if (output_stream == INVALID_HANDLE_VALUE) {
	// Retry with stdout?
	output_stream = GetStdHandle(STD_OUTPUT_HANDLE);
	if (output_stream == 0)
	output_stream = INVALID_HANDLE_VALUE;
	if (output_stream == INVALID_HANDLE_VALUE)
	return 0;
	} else {
	// Successfully got an stderr handle. However, if WriteFile() fails,
	// we can still try to fallback to stdout.
	fallback_to_stdout = true;
	}
	}

	DWORD ret;
	if (WriteFile(output_stream, buf, count, &ret, 0))
	return ret;

	// Re-try with stdout if using a valid stderr handle fails.
	if (fallback_to_stdout) {
	output_stream = GetStdHandle(STD_OUTPUT_HANDLE);
	if (output_stream == 0)
	output_stream = INVALID_HANDLE_VALUE;
	if (output_stream != INVALID_HANDLE_VALUE)
	return internal_write(fd, buf, count);
	}
	return 0;
	}

	uptr internal_stat(const char path, void buf) {
	UNIMPLEMENTED();
	}

	uptr internal_lstat(const char path, void buf) {
	UNIMPLEMENTED();
	}

	uptr internal_fstat(fd_t fd, void *buf) {
	UNIMPLEMENTED();
	}

	uptr internal_filesize(fd_t fd) {
	UNIMPLEMENTED();
	}

	uptr internal_dup2(int oldfd, int newfd) {
	UNIMPLEMENTED();
	}

	uptr internal_readlink(const char path, char buf, uptr bufsize) {
	UNIMPLEMENTED();
	}

	uptr internal_sched_yield() {
	Sleep(0);
	return 0;
	}

	void internal__exit(int exitcode) {
	ExitProcess(exitcode);
	}

	// ---------------------- BlockingMutex ---------------- {{{1
	const uptr LOCK_UNINITIALIZED = 0;
	const uptr LOCK_READY = (uptr)-1;

	BlockingMutex::BlockingMutex(LinkerInitialized li) {
	// FIXME: see comments in BlockingMutex::Lock() for the details.
	CHECK(li == LINKER_INITIALIZED \|\| owner_ == LOCK_UNINITIALIZED);

	CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
	InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
	owner_ = LOCK_READY;
	}

	BlockingMutex::BlockingMutex() {
	CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
	InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
	owner_ = LOCK_READY;
	}

	void BlockingMutex::Lock() {
	if (owner_ == LOCK_UNINITIALIZED) {
	// FIXME: hm, global BlockingMutex objects are not initialized?!?
	// This might be a side effect of the clang+cl+link Frankenbuild...
	new(this) BlockingMutex((LinkerInitialized)(LINKER_INITIALIZED + 1));

	// FIXME: If it turns out the linker doesn't invoke our
	// constructors, we should probably manually Lock/Unlock all the global
	// locks while we're starting in one thread to avoid double-init races.
	}
	EnterCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
	CHECK_EQ(owner_, LOCK_READY);
	owner_ = GetThreadSelf();
	}

	void BlockingMutex::Unlock() {
	CHECK_EQ(owner_, GetThreadSelf());
	owner_ = LOCK_READY;
	LeaveCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
	}

	void BlockingMutex::CheckLocked() {
	CHECK_EQ(owner_, GetThreadSelf());
	}

	uptr GetTlsSize() {
	return 0;
	}

	void InitTlsSize() {
	}

	void GetThreadStackAndTls(bool main, uptr stk_addr, uptr stk_size,
	uptr tls_addr, uptr tls_size) {
	#ifdef SANITIZER_GO
	*stk_addr = 0;
	*stk_size = 0;
	*tls_addr = 0;
	*tls_size = 0;
	#else
	uptr stack_top, stack_bottom;
	GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
	*stk_addr = stack_bottom;
	*stk_size = stack_top - stack_bottom;
	*tls_addr = 0;
	*tls_size = 0;
	#endif
	}

	void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
	CHECK_GE(max_depth, 2);
	// FIXME: CaptureStackBackTrace might be too slow for us.
	// FIXME: Compare with StackWalk64.
	// FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
	size = CaptureStackBackTrace(2, Min(max_depth, kStackTraceMax),
	(void**)trace, 0);
	if (size == 0)
	return;

	// Skip the RTL frames by searching for the PC in the stacktrace.
	uptr pc_location = LocatePcInTrace(pc);
	PopStackFrames(pc_location);
	}

	void StackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
	uptr max_depth) {
	UNREACHABLE("no signal context on windows");
	}

	void MaybeOpenReportFile() {
	// Windows doesn't have native fork, and we don't support Cygwin or other
	// environments that try to fake it, so the initial report_fd will always be
	// correct.
	}

	void RawWrite(const char *buffer) {
	uptr length = (uptr)internal_strlen(buffer);
	if (length != internal_write(report_fd, buffer, length)) {
	// stderr may be closed, but we may be able to print to the debugger
	// instead. This is the case when launching a program from Visual Studio,
	// and the following routine should write to its console.
	OutputDebugStringA(buffer);
	}
	}

	void SetAlternateSignalStack() {
	// FIXME: Decide what to do on Windows.
	}

	void UnsetAlternateSignalStack() {
	// FIXME: Decide what to do on Windows.
	}

	void InstallDeadlySignalHandlers(SignalHandlerType handler) {
	(void)handler;
	// FIXME: Decide what to do on Windows.
	}

	bool IsDeadlySignal(int signum) {
	// FIXME: Decide what to do on Windows.
	return false;
	}

	} // namespace __sanitizer

	#endif // _WIN32