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/Errc.h"
18 #include "llvm/Support/FileSystem.h"
19 #include "llvm/Support/Path.h"
20 #include "llvm/Support/WindowsError.h"
21 #include "llvm/Support/raw_ostream.h"
28 //===----------------------------------------------------------------------===//
29 //=== WARNING: Implementation here must contain only Win32 specific code
30 //=== and must not be UNIX code
31 //===----------------------------------------------------------------------===//
35 ProcessInfo::ProcessInfo() : Pid(0), Process(0), ReturnCode(0) {}
37 ErrorOr<std::string> sys::findProgramByName(StringRef Name,
38 ArrayRef<StringRef> Paths) {
39 assert(!Name.empty() && "Must have a name!");
41 if (Name.find_first_of("/\\") != StringRef::npos)
42 return std::string(Name);
44 const wchar_t *Path = nullptr;
45 std::wstring PathStorage;
47 PathStorage.reserve(Paths.size() * MAX_PATH);
48 for (unsigned i = 0; i < Paths.size(); ++i) {
50 PathStorage.push_back(L';');
51 StringRef P = Paths[i];
52 SmallVector<wchar_t, MAX_PATH> TmpPath;
53 if (std::error_code EC = windows::UTF8ToUTF16(P, TmpPath))
55 PathStorage.append(TmpPath.begin(), TmpPath.end());
57 Path = PathStorage.c_str();
60 SmallVector<wchar_t, MAX_PATH> U16Name;
61 if (std::error_code EC = windows::UTF8ToUTF16(Name, U16Name))
64 SmallVector<StringRef, 12> PathExts;
65 PathExts.push_back("");
66 PathExts.push_back(".exe"); // FIXME: This must be in %PATHEXT%.
67 if (const char *PathExtEnv = std::getenv("PATHEXT"))
68 SplitString(PathExtEnv, PathExts, ";");
70 SmallVector<wchar_t, MAX_PATH> U16Result;
72 for (StringRef Ext : PathExts) {
73 SmallVector<wchar_t, MAX_PATH> U16Ext;
74 if (std::error_code EC = windows::UTF8ToUTF16(Ext, U16Ext))
78 U16Result.reserve(Len);
79 // Lets attach the extension manually. That is needed for files
80 // with a point in name like aaa.bbb. SearchPathW will not add extension
81 // from its argument to such files because it thinks they already had one.
82 SmallVector<wchar_t, MAX_PATH> U16NameExt;
83 if (std::error_code EC =
84 windows::UTF8ToUTF16(Twine(Name + Ext).str(), U16NameExt))
87 Len = ::SearchPathW(Path, c_str(U16NameExt), nullptr,
88 U16Result.capacity(), U16Result.data(), nullptr);
89 } while (Len > U16Result.capacity());
96 return mapWindowsError(::GetLastError());
98 U16Result.set_size(Len);
100 SmallVector<char, MAX_PATH> U8Result;
101 if (std::error_code EC =
102 windows::UTF16ToUTF8(U16Result.data(), U16Result.size(), U8Result))
105 return std::string(U8Result.begin(), U8Result.end());
108 bool MakeErrMsg(std::string *ErrMsg, const std::string &prefix) {
112 DWORD LastError = GetLastError();
113 DWORD R = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
114 FORMAT_MESSAGE_FROM_SYSTEM |
115 FORMAT_MESSAGE_MAX_WIDTH_MASK,
116 NULL, LastError, 0, (LPSTR)&buffer, 1, NULL);
118 *ErrMsg = prefix + ": " + buffer;
120 *ErrMsg = prefix + ": Unknown error";
121 *ErrMsg += " (0x" + llvm::utohexstr(LastError) + ")";
127 static HANDLE RedirectIO(Optional<StringRef> Path, int fd,
128 std::string *ErrMsg) {
131 if (!DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
132 GetCurrentProcess(), &h,
133 0, TRUE, DUPLICATE_SAME_ACCESS))
134 return INVALID_HANDLE_VALUE;
144 SECURITY_ATTRIBUTES sa;
145 sa.nLength = sizeof(sa);
146 sa.lpSecurityDescriptor = 0;
147 sa.bInheritHandle = TRUE;
149 SmallVector<wchar_t, 128> fnameUnicode;
151 // Don't play long-path tricks on "NUL".
152 if (windows::UTF8ToUTF16(fname, fnameUnicode))
153 return INVALID_HANDLE_VALUE;
155 if (path::widenPath(fname, fnameUnicode))
156 return INVALID_HANDLE_VALUE;
158 h = CreateFileW(fnameUnicode.data(), fd ? GENERIC_WRITE : GENERIC_READ,
159 FILE_SHARE_READ, &sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
160 FILE_ATTRIBUTE_NORMAL, NULL);
161 if (h == INVALID_HANDLE_VALUE) {
162 MakeErrMsg(ErrMsg, fname + ": Can't open file for " +
163 (fd ? "input" : "output"));
171 static bool Execute(ProcessInfo &PI, StringRef Program,
172 ArrayRef<StringRef> Args, Optional<ArrayRef<StringRef>> Env,
173 ArrayRef<Optional<StringRef>> Redirects,
174 unsigned MemoryLimit, std::string *ErrMsg) {
175 if (!sys::fs::can_execute(Program)) {
177 *ErrMsg = "program not executable";
181 // can_execute may succeed by looking at Program + ".exe". CreateProcessW
182 // will implicitly add the .exe if we provide a command line without an
183 // executable path, but since we use an explicit executable, we have to add
185 SmallString<64> ProgramStorage;
186 if (!sys::fs::exists(Program))
187 Program = Twine(Program + ".exe").toStringRef(ProgramStorage);
189 // Windows wants a command line, not an array of args, to pass to the new
190 // process. We have to concatenate them all, while quoting the args that
191 // have embedded spaces (or are empty).
192 std::string Command = flattenWindowsCommandLine(Args);
194 // The pointer to the environment block for the new process.
195 std::vector<wchar_t> EnvBlock;
198 // An environment block consists of a null-terminated block of
199 // null-terminated strings. Convert the array of environment variables to
200 // an environment block by concatenating them.
201 for (const auto E : *Env) {
202 SmallVector<wchar_t, MAX_PATH> EnvString;
203 if (std::error_code ec = windows::UTF8ToUTF16(E, EnvString)) {
204 SetLastError(ec.value());
205 MakeErrMsg(ErrMsg, "Unable to convert environment variable to UTF-16");
209 EnvBlock.insert(EnvBlock.end(), EnvString.begin(), EnvString.end());
210 EnvBlock.push_back(0);
212 EnvBlock.push_back(0);
215 // Create a child process.
217 memset(&si, 0, sizeof(si));
219 si.hStdInput = INVALID_HANDLE_VALUE;
220 si.hStdOutput = INVALID_HANDLE_VALUE;
221 si.hStdError = INVALID_HANDLE_VALUE;
223 if (!Redirects.empty()) {
224 si.dwFlags = STARTF_USESTDHANDLES;
226 si.hStdInput = RedirectIO(Redirects[0], 0, ErrMsg);
227 if (si.hStdInput == INVALID_HANDLE_VALUE) {
228 MakeErrMsg(ErrMsg, "can't redirect stdin");
231 si.hStdOutput = RedirectIO(Redirects[1], 1, ErrMsg);
232 if (si.hStdOutput == INVALID_HANDLE_VALUE) {
233 CloseHandle(si.hStdInput);
234 MakeErrMsg(ErrMsg, "can't redirect stdout");
237 if (Redirects[1] && Redirects[2] && *Redirects[1] == *Redirects[2]) {
238 // If stdout and stderr should go to the same place, redirect stderr
239 // to the handle already open for stdout.
240 if (!DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
241 GetCurrentProcess(), &si.hStdError,
242 0, TRUE, DUPLICATE_SAME_ACCESS)) {
243 CloseHandle(si.hStdInput);
244 CloseHandle(si.hStdOutput);
245 MakeErrMsg(ErrMsg, "can't dup stderr to stdout");
249 // Just redirect stderr
250 si.hStdError = RedirectIO(Redirects[2], 2, ErrMsg);
251 if (si.hStdError == INVALID_HANDLE_VALUE) {
252 CloseHandle(si.hStdInput);
253 CloseHandle(si.hStdOutput);
254 MakeErrMsg(ErrMsg, "can't redirect stderr");
260 PROCESS_INFORMATION pi;
261 memset(&pi, 0, sizeof(pi));
266 SmallVector<wchar_t, MAX_PATH> ProgramUtf16;
267 if (std::error_code ec = path::widenPath(Program, ProgramUtf16)) {
268 SetLastError(ec.value());
270 std::string("Unable to convert application name to UTF-16"));
274 SmallVector<wchar_t, MAX_PATH> CommandUtf16;
275 if (std::error_code ec = windows::UTF8ToUTF16(Command, CommandUtf16)) {
276 SetLastError(ec.value());
278 std::string("Unable to convert command-line to UTF-16"));
282 BOOL rc = CreateProcessW(ProgramUtf16.data(), CommandUtf16.data(), 0, 0,
283 TRUE, CREATE_UNICODE_ENVIRONMENT,
284 EnvBlock.empty() ? 0 : EnvBlock.data(), 0, &si,
286 DWORD err = GetLastError();
288 // Regardless of whether the process got created or not, we are done with
289 // the handles we created for it to inherit.
290 CloseHandle(si.hStdInput);
291 CloseHandle(si.hStdOutput);
292 CloseHandle(si.hStdError);
294 // Now return an error if the process didn't get created.
297 MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
298 Program.str() + "'");
302 PI.Pid = pi.dwProcessId;
303 PI.Process = pi.hProcess;
305 // Make sure these get closed no matter what.
306 ScopedCommonHandle hThread(pi.hThread);
308 // Assign the process to a job if a memory limit is defined.
309 ScopedJobHandle hJob;
310 if (MemoryLimit != 0) {
311 hJob = CreateJobObjectW(0, 0);
312 bool success = false;
314 JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
315 memset(&jeli, 0, sizeof(jeli));
316 jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
317 jeli.ProcessMemoryLimit = uintptr_t(MemoryLimit) * 1048576;
318 if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
319 &jeli, sizeof(jeli))) {
320 if (AssignProcessToJobObject(hJob, pi.hProcess))
325 SetLastError(GetLastError());
326 MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
327 TerminateProcess(pi.hProcess, 1);
328 WaitForSingleObject(pi.hProcess, INFINITE);
336 static bool argNeedsQuotes(StringRef Arg) {
339 return StringRef::npos != Arg.find_first_of("\t \"&\'()*<>\\`^|\n");
342 static std::string quoteSingleArg(StringRef Arg) {
344 Result.push_back('"');
346 while (!Arg.empty()) {
347 size_t FirstNonBackslash = Arg.find_first_not_of('\\');
348 size_t BackslashCount = FirstNonBackslash;
349 if (FirstNonBackslash == StringRef::npos) {
350 // The entire remainder of the argument is backslashes. Escape all of
351 // them and just early out.
352 BackslashCount = Arg.size();
353 Result.append(BackslashCount * 2, '\\');
357 if (Arg[FirstNonBackslash] == '\"') {
358 // This is an embedded quote. Escape all preceding backslashes, then
359 // add one additional backslash to escape the quote.
360 Result.append(BackslashCount * 2 + 1, '\\');
361 Result.push_back('\"');
363 // This is just a normal character. Don't escape any of the preceding
364 // backslashes, just append them as they are and then append the
366 Result.append(BackslashCount, '\\');
367 Result.push_back(Arg[FirstNonBackslash]);
370 // Drop all the backslashes, plus the following character.
371 Arg = Arg.drop_front(FirstNonBackslash + 1);
374 Result.push_back('"');
379 std::string sys::flattenWindowsCommandLine(ArrayRef<StringRef> Args) {
381 for (StringRef Arg : Args) {
382 if (argNeedsQuotes(Arg))
383 Command += quoteSingleArg(Arg);
387 Command.push_back(' ');
393 ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
394 bool WaitUntilChildTerminates, std::string *ErrMsg) {
395 assert(PI.Pid && "invalid pid to wait on, process not started?");
396 assert((PI.Process && PI.Process != INVALID_HANDLE_VALUE) &&
397 "invalid process handle to wait on, process not started?");
398 DWORD milliSecondsToWait = 0;
399 if (WaitUntilChildTerminates)
400 milliSecondsToWait = INFINITE;
401 else if (SecondsToWait > 0)
402 milliSecondsToWait = SecondsToWait * 1000;
404 ProcessInfo WaitResult = PI;
405 DWORD WaitStatus = WaitForSingleObject(PI.Process, milliSecondsToWait);
406 if (WaitStatus == WAIT_TIMEOUT) {
408 if (!TerminateProcess(PI.Process, 1)) {
410 MakeErrMsg(ErrMsg, "Failed to terminate timed-out program");
412 // -2 indicates a crash or timeout as opposed to failure to execute.
413 WaitResult.ReturnCode = -2;
414 CloseHandle(PI.Process);
417 WaitForSingleObject(PI.Process, INFINITE);
418 CloseHandle(PI.Process);
420 // Non-blocking wait.
421 return ProcessInfo();
425 // Get its exit status.
427 BOOL rc = GetExitCodeProcess(PI.Process, &status);
428 DWORD err = GetLastError();
429 if (err != ERROR_INVALID_HANDLE)
430 CloseHandle(PI.Process);
435 MakeErrMsg(ErrMsg, "Failed getting status for program");
437 // -2 indicates a crash or timeout as opposed to failure to execute.
438 WaitResult.ReturnCode = -2;
445 // Pass 10(Warning) and 11(Error) to the callee as negative value.
446 if ((status & 0xBFFF0000U) == 0x80000000U)
447 WaitResult.ReturnCode = static_cast<int>(status);
448 else if (status & 0xFF)
449 WaitResult.ReturnCode = status & 0x7FFFFFFF;
451 WaitResult.ReturnCode = 1;
456 std::error_code sys::ChangeStdinToBinary() {
457 int result = _setmode(_fileno(stdin), _O_BINARY);
459 return std::error_code(errno, std::generic_category());
460 return std::error_code();
463 std::error_code sys::ChangeStdoutToBinary() {
464 int result = _setmode(_fileno(stdout), _O_BINARY);
466 return std::error_code(errno, std::generic_category());
467 return std::error_code();
471 llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
472 WindowsEncodingMethod Encoding) {
474 llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::F_Text);
478 if (Encoding == WEM_UTF8) {
480 } else if (Encoding == WEM_CurrentCodePage) {
481 SmallVector<wchar_t, 1> ArgsUTF16;
482 SmallVector<char, 1> ArgsCurCP;
484 if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
487 if ((EC = windows::UTF16ToCurCP(
488 ArgsUTF16.data(), ArgsUTF16.size(), ArgsCurCP)))
491 OS.write(ArgsCurCP.data(), ArgsCurCP.size());
492 } else if (Encoding == WEM_UTF16) {
493 SmallVector<wchar_t, 1> ArgsUTF16;
495 if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
498 // Endianness guessing
500 uint16_t src = UNI_UTF16_BYTE_ORDER_MARK_NATIVE;
501 memcpy(BOM, &src, 2);
503 OS.write((char *)ArgsUTF16.data(), ArgsUTF16.size() << 1);
505 llvm_unreachable("Unknown encoding");
509 return make_error_code(errc::io_error);
514 bool llvm::sys::commandLineFitsWithinSystemLimits(StringRef Program,
515 ArrayRef<StringRef> Args) {
516 // The documented max length of the command line passed to CreateProcess.
517 static const size_t MaxCommandStringLength = 32768;
518 SmallVector<StringRef, 8> FullArgs;
519 FullArgs.push_back(Program);
520 FullArgs.append(Args.begin(), Args.end());
521 std::string Result = flattenWindowsCommandLine(FullArgs);
522 return (Result.size() + 1) <= MaxCommandStringLength;