1 //===- Win32/Program.cpp - Win32 Program Implementation ------- -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides the Win32 specific implementation of the Program class.
12 //===----------------------------------------------------------------------===//
14 #include "WindowsSupport.h"
15 #include "llvm/ADT/StringExtras.h"
16 #include "llvm/Support/ConvertUTF.h"
17 #include "llvm/Support/FileSystem.h"
18 #include "llvm/Support/raw_ostream.h"
19 #include "llvm/Support/WindowsError.h"
25 //===----------------------------------------------------------------------===//
26 //=== WARNING: Implementation here must contain only Win32 specific code
27 //=== and must not be UNIX code
28 //===----------------------------------------------------------------------===//
33 ProcessInfo::ProcessInfo() : ProcessHandle(0), Pid(0), ReturnCode(0) {}
35 ErrorOr<std::string> sys::findProgramByName(StringRef Name,
36 ArrayRef<StringRef> Paths) {
37 assert(!Name.empty() && "Must have a name!");
39 if (Name.find_first_of("/\\") != StringRef::npos)
40 return std::string(Name);
42 const wchar_t *Path = nullptr;
43 std::wstring PathStorage;
45 PathStorage.reserve(Paths.size() * MAX_PATH);
46 for (unsigned i = 0; i < Paths.size(); ++i) {
48 PathStorage.push_back(L';');
49 StringRef P = Paths[i];
50 SmallVector<wchar_t, MAX_PATH> TmpPath;
51 if (std::error_code EC = windows::UTF8ToUTF16(P, TmpPath))
53 PathStorage.append(TmpPath.begin(), TmpPath.end());
55 Path = PathStorage.c_str();
58 SmallVector<wchar_t, MAX_PATH> U16Name;
59 if (std::error_code EC = windows::UTF8ToUTF16(Name, U16Name))
62 SmallVector<StringRef, 12> PathExts;
63 PathExts.push_back("");
64 PathExts.push_back(".exe"); // FIXME: This must be in %PATHEXT%.
65 SplitString(std::getenv("PATHEXT"), PathExts, ";");
67 SmallVector<wchar_t, MAX_PATH> U16Result;
69 for (StringRef Ext : PathExts) {
70 SmallVector<wchar_t, MAX_PATH> U16Ext;
71 if (std::error_code EC = windows::UTF8ToUTF16(Ext, U16Ext))
75 U16Result.reserve(Len);
76 Len = ::SearchPathW(Path, c_str(U16Name),
77 U16Ext.empty() ? nullptr : c_str(U16Ext),
78 U16Result.capacity(), U16Result.data(), nullptr);
79 } while (Len > U16Result.capacity());
86 return mapWindowsError(::GetLastError());
88 U16Result.set_size(Len);
90 SmallVector<char, MAX_PATH> U8Result;
91 if (std::error_code EC =
92 windows::UTF16ToUTF8(U16Result.data(), U16Result.size(), U8Result))
95 return std::string(U8Result.begin(), U8Result.end());
98 static HANDLE RedirectIO(const StringRef *path, int fd, std::string* ErrMsg) {
101 if (!DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
102 GetCurrentProcess(), &h,
103 0, TRUE, DUPLICATE_SAME_ACCESS))
104 return INVALID_HANDLE_VALUE;
114 SECURITY_ATTRIBUTES sa;
115 sa.nLength = sizeof(sa);
116 sa.lpSecurityDescriptor = 0;
117 sa.bInheritHandle = TRUE;
119 SmallVector<wchar_t, 128> fnameUnicode;
121 // Don't play long-path tricks on "NUL".
122 if (windows::UTF8ToUTF16(fname, fnameUnicode))
123 return INVALID_HANDLE_VALUE;
125 if (path::widenPath(fname, fnameUnicode))
126 return INVALID_HANDLE_VALUE;
128 h = CreateFileW(fnameUnicode.data(), fd ? GENERIC_WRITE : GENERIC_READ,
129 FILE_SHARE_READ, &sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
130 FILE_ATTRIBUTE_NORMAL, NULL);
131 if (h == INVALID_HANDLE_VALUE) {
132 MakeErrMsg(ErrMsg, fname + ": Can't open file for " +
133 (fd ? "input: " : "output: "));
139 /// ArgNeedsQuotes - Check whether argument needs to be quoted when calling
141 static bool ArgNeedsQuotes(const char *Str) {
142 return Str[0] == '\0' || strpbrk(Str, "\t \"&\'()*<>\\`^|") != 0;
145 /// CountPrecedingBackslashes - Returns the number of backslashes preceding Cur
146 /// in the C string Start.
147 static unsigned int CountPrecedingBackslashes(const char *Start,
149 unsigned int Count = 0;
151 while (Cur >= Start && *Cur == '\\') {
158 /// EscapePrecedingEscapes - Append a backslash to Dst for every backslash
159 /// preceding Cur in the Start string. Assumes Dst has enough space.
160 static char *EscapePrecedingEscapes(char *Dst, const char *Start,
162 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Cur);
163 while (PrecedingEscapes > 0) {
170 /// ArgLenWithQuotes - Check whether argument needs to be quoted when calling
171 /// CreateProcess and returns length of quoted arg with escaped quotes
172 static unsigned int ArgLenWithQuotes(const char *Str) {
173 const char *Start = Str;
174 bool Quoted = ArgNeedsQuotes(Str);
175 unsigned int len = Quoted ? 2 : 0;
177 while (*Str != '\0') {
179 // We need to add a backslash, but ensure that it isn't escaped.
180 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
181 len += PrecedingEscapes + 1;
183 // Note that we *don't* need to escape runs of backslashes that don't
184 // precede a double quote! See MSDN:
185 // http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
192 // Make sure the closing quote doesn't get escaped by a trailing backslash.
193 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
194 len += PrecedingEscapes + 1;
202 static std::unique_ptr<char[]> flattenArgs(const char **args) {
203 // First, determine the length of the command line.
205 for (unsigned i = 0; args[i]; i++) {
206 len += ArgLenWithQuotes(args[i]) + 1;
209 // Now build the command line.
210 std::unique_ptr<char[]> command(new char[len+1]);
211 char *p = command.get();
213 for (unsigned i = 0; args[i]; i++) {
214 const char *arg = args[i];
215 const char *start = arg;
217 bool needsQuoting = ArgNeedsQuotes(arg);
221 while (*arg != '\0') {
223 // Escape all preceding escapes (if any), and then escape the quote.
224 p = EscapePrecedingEscapes(p, start, arg);
232 // Make sure our quote doesn't get escaped by a trailing backslash.
233 p = EscapePrecedingEscapes(p, start, arg);
243 static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
244 const char **envp, const StringRef **redirects,
245 unsigned memoryLimit, std::string *ErrMsg) {
246 if (!sys::fs::can_execute(Program)) {
248 *ErrMsg = "program not executable";
252 // Windows wants a command line, not an array of args, to pass to the new
253 // process. We have to concatenate them all, while quoting the args that
254 // have embedded spaces (or are empty).
255 std::unique_ptr<char[]> command = flattenArgs(args);
257 // The pointer to the environment block for the new process.
258 std::vector<wchar_t> EnvBlock;
261 // An environment block consists of a null-terminated block of
262 // null-terminated strings. Convert the array of environment variables to
263 // an environment block by concatenating them.
264 for (unsigned i = 0; envp[i]; ++i) {
265 SmallVector<wchar_t, MAX_PATH> EnvString;
266 if (std::error_code ec = windows::UTF8ToUTF16(envp[i], EnvString)) {
267 SetLastError(ec.value());
268 MakeErrMsg(ErrMsg, "Unable to convert environment variable to UTF-16");
272 EnvBlock.insert(EnvBlock.end(), EnvString.begin(), EnvString.end());
273 EnvBlock.push_back(0);
275 EnvBlock.push_back(0);
278 // Create a child process.
280 memset(&si, 0, sizeof(si));
282 si.hStdInput = INVALID_HANDLE_VALUE;
283 si.hStdOutput = INVALID_HANDLE_VALUE;
284 si.hStdError = INVALID_HANDLE_VALUE;
287 si.dwFlags = STARTF_USESTDHANDLES;
289 si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
290 if (si.hStdInput == INVALID_HANDLE_VALUE) {
291 MakeErrMsg(ErrMsg, "can't redirect stdin");
294 si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
295 if (si.hStdOutput == INVALID_HANDLE_VALUE) {
296 CloseHandle(si.hStdInput);
297 MakeErrMsg(ErrMsg, "can't redirect stdout");
300 if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
301 // If stdout and stderr should go to the same place, redirect stderr
302 // to the handle already open for stdout.
303 if (!DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
304 GetCurrentProcess(), &si.hStdError,
305 0, TRUE, DUPLICATE_SAME_ACCESS)) {
306 CloseHandle(si.hStdInput);
307 CloseHandle(si.hStdOutput);
308 MakeErrMsg(ErrMsg, "can't dup stderr to stdout");
312 // Just redirect stderr
313 si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
314 if (si.hStdError == INVALID_HANDLE_VALUE) {
315 CloseHandle(si.hStdInput);
316 CloseHandle(si.hStdOutput);
317 MakeErrMsg(ErrMsg, "can't redirect stderr");
323 PROCESS_INFORMATION pi;
324 memset(&pi, 0, sizeof(pi));
329 SmallVector<wchar_t, MAX_PATH> ProgramUtf16;
330 if (std::error_code ec = path::widenPath(Program, ProgramUtf16)) {
331 SetLastError(ec.value());
333 std::string("Unable to convert application name to UTF-16"));
337 SmallVector<wchar_t, MAX_PATH> CommandUtf16;
338 if (std::error_code ec = windows::UTF8ToUTF16(command.get(), CommandUtf16)) {
339 SetLastError(ec.value());
341 std::string("Unable to convert command-line to UTF-16"));
345 BOOL rc = CreateProcessW(ProgramUtf16.data(), CommandUtf16.data(), 0, 0,
346 TRUE, CREATE_UNICODE_ENVIRONMENT,
347 EnvBlock.empty() ? 0 : EnvBlock.data(), 0, &si,
349 DWORD err = GetLastError();
351 // Regardless of whether the process got created or not, we are done with
352 // the handles we created for it to inherit.
353 CloseHandle(si.hStdInput);
354 CloseHandle(si.hStdOutput);
355 CloseHandle(si.hStdError);
357 // Now return an error if the process didn't get created.
360 MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
361 Program.str() + "'");
365 PI.Pid = pi.dwProcessId;
366 PI.ProcessHandle = pi.hProcess;
368 // Make sure these get closed no matter what.
369 ScopedCommonHandle hThread(pi.hThread);
371 // Assign the process to a job if a memory limit is defined.
372 ScopedJobHandle hJob;
373 if (memoryLimit != 0) {
374 hJob = CreateJobObjectW(0, 0);
375 bool success = false;
377 JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
378 memset(&jeli, 0, sizeof(jeli));
379 jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
380 jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
381 if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
382 &jeli, sizeof(jeli))) {
383 if (AssignProcessToJobObject(hJob, pi.hProcess))
388 SetLastError(GetLastError());
389 MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
390 TerminateProcess(pi.hProcess, 1);
391 WaitForSingleObject(pi.hProcess, INFINITE);
400 ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
401 bool WaitUntilChildTerminates, std::string *ErrMsg) {
402 assert(PI.Pid && "invalid pid to wait on, process not started?");
403 assert(PI.ProcessHandle &&
404 "invalid process handle to wait on, process not started?");
405 DWORD milliSecondsToWait = 0;
406 if (WaitUntilChildTerminates)
407 milliSecondsToWait = INFINITE;
408 else if (SecondsToWait > 0)
409 milliSecondsToWait = SecondsToWait * 1000;
411 ProcessInfo WaitResult = PI;
412 DWORD WaitStatus = WaitForSingleObject(PI.ProcessHandle, milliSecondsToWait);
413 if (WaitStatus == WAIT_TIMEOUT) {
415 if (!TerminateProcess(PI.ProcessHandle, 1)) {
417 MakeErrMsg(ErrMsg, "Failed to terminate timed-out program.");
419 // -2 indicates a crash or timeout as opposed to failure to execute.
420 WaitResult.ReturnCode = -2;
421 CloseHandle(PI.ProcessHandle);
424 WaitForSingleObject(PI.ProcessHandle, INFINITE);
425 CloseHandle(PI.ProcessHandle);
427 // Non-blocking wait.
428 return ProcessInfo();
432 // Get its exit status.
434 BOOL rc = GetExitCodeProcess(PI.ProcessHandle, &status);
435 DWORD err = GetLastError();
436 CloseHandle(PI.ProcessHandle);
441 MakeErrMsg(ErrMsg, "Failed getting status for program.");
443 // -2 indicates a crash or timeout as opposed to failure to execute.
444 WaitResult.ReturnCode = -2;
451 // Pass 10(Warning) and 11(Error) to the callee as negative value.
452 if ((status & 0xBFFF0000U) == 0x80000000U)
453 WaitResult.ReturnCode = static_cast<int>(status);
454 else if (status & 0xFF)
455 WaitResult.ReturnCode = status & 0x7FFFFFFF;
457 WaitResult.ReturnCode = 1;
462 std::error_code sys::ChangeStdinToBinary() {
463 int result = _setmode(_fileno(stdin), _O_BINARY);
465 return std::error_code(errno, std::generic_category());
466 return std::error_code();
469 std::error_code sys::ChangeStdoutToBinary() {
470 int result = _setmode(_fileno(stdout), _O_BINARY);
472 return std::error_code(errno, std::generic_category());
473 return std::error_code();
477 llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
478 WindowsEncodingMethod Encoding) {
480 llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::F_Text);
484 if (Encoding == WEM_UTF8) {
486 } else if (Encoding == WEM_CurrentCodePage) {
487 SmallVector<wchar_t, 1> ArgsUTF16;
488 SmallVector<char, 1> ArgsCurCP;
490 if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
493 if ((EC = windows::UTF16ToCurCP(
494 ArgsUTF16.data(), ArgsUTF16.size(), ArgsCurCP)))
497 OS.write(ArgsCurCP.data(), ArgsCurCP.size());
498 } else if (Encoding == WEM_UTF16) {
499 SmallVector<wchar_t, 1> ArgsUTF16;
501 if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
504 // Endianness guessing
506 uint16_t src = UNI_UTF16_BYTE_ORDER_MARK_NATIVE;
507 memcpy(BOM, &src, 2);
509 OS.write((char *)ArgsUTF16.data(), ArgsUTF16.size() << 1);
511 llvm_unreachable("Unknown encoding");
515 return std::make_error_code(std::errc::io_error);
520 bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
521 // The documented max length of the command line passed to CreateProcess.
522 static const size_t MaxCommandStringLength = 32768;
523 size_t ArgLength = 0;
524 for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
526 // Account for the trailing space for every arg but the last one and the
527 // trailing NULL of the last argument.
528 ArgLength += ArgLenWithQuotes(*I) + 1;
529 if (ArgLength > MaxCommandStringLength) {