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/WindowsError.h"
20 #include "llvm/Support/raw_ostream.h"
26 //===----------------------------------------------------------------------===//
27 //=== WARNING: Implementation here must contain only Win32 specific code
28 //=== and must not be UNIX code
29 //===----------------------------------------------------------------------===//
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 if (const char *PathExtEnv = std::getenv("PATHEXT"))
66 SplitString(PathExtEnv, PathExts, ";");
68 SmallVector<wchar_t, MAX_PATH> U16Result;
70 for (StringRef Ext : PathExts) {
71 SmallVector<wchar_t, MAX_PATH> U16Ext;
72 if (std::error_code EC = windows::UTF8ToUTF16(Ext, U16Ext))
76 U16Result.reserve(Len);
77 // Lets attach the extension manually. That is needed for files
78 // with a point in name like aaa.bbb. SearchPathW will not add extension
79 // from its argument to such files because it thinks they already had one.
80 SmallVector<wchar_t, MAX_PATH> U16NameExt;
81 if (std::error_code EC =
82 windows::UTF8ToUTF16(Twine(Name + Ext).str(), U16NameExt))
85 Len = ::SearchPathW(Path, c_str(U16NameExt), nullptr,
86 U16Result.capacity(), U16Result.data(), nullptr);
87 } while (Len > U16Result.capacity());
94 return mapWindowsError(::GetLastError());
96 U16Result.set_size(Len);
98 SmallVector<char, MAX_PATH> U8Result;
99 if (std::error_code EC =
100 windows::UTF16ToUTF8(U16Result.data(), U16Result.size(), U8Result))
103 return std::string(U8Result.begin(), U8Result.end());
106 static HANDLE RedirectIO(const StringRef *path, int fd, std::string* ErrMsg) {
109 if (!DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
110 GetCurrentProcess(), &h,
111 0, TRUE, DUPLICATE_SAME_ACCESS))
112 return INVALID_HANDLE_VALUE;
122 SECURITY_ATTRIBUTES sa;
123 sa.nLength = sizeof(sa);
124 sa.lpSecurityDescriptor = 0;
125 sa.bInheritHandle = TRUE;
127 SmallVector<wchar_t, 128> fnameUnicode;
129 // Don't play long-path tricks on "NUL".
130 if (windows::UTF8ToUTF16(fname, fnameUnicode))
131 return INVALID_HANDLE_VALUE;
133 if (path::widenPath(fname, fnameUnicode))
134 return INVALID_HANDLE_VALUE;
136 h = CreateFileW(fnameUnicode.data(), fd ? GENERIC_WRITE : GENERIC_READ,
137 FILE_SHARE_READ, &sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
138 FILE_ATTRIBUTE_NORMAL, NULL);
139 if (h == INVALID_HANDLE_VALUE) {
140 MakeErrMsg(ErrMsg, fname + ": Can't open file for " +
141 (fd ? "input" : "output"));
147 /// ArgNeedsQuotes - Check whether argument needs to be quoted when calling
149 static bool ArgNeedsQuotes(const char *Str) {
150 return Str[0] == '\0' || strpbrk(Str, "\t \"&\'()*<>\\`^|") != 0;
153 /// CountPrecedingBackslashes - Returns the number of backslashes preceding Cur
154 /// in the C string Start.
155 static unsigned int CountPrecedingBackslashes(const char *Start,
157 unsigned int Count = 0;
159 while (Cur >= Start && *Cur == '\\') {
166 /// EscapePrecedingEscapes - Append a backslash to Dst for every backslash
167 /// preceding Cur in the Start string. Assumes Dst has enough space.
168 static char *EscapePrecedingEscapes(char *Dst, const char *Start,
170 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Cur);
171 while (PrecedingEscapes > 0) {
178 /// ArgLenWithQuotes - Check whether argument needs to be quoted when calling
179 /// CreateProcess and returns length of quoted arg with escaped quotes
180 static unsigned int ArgLenWithQuotes(const char *Str) {
181 const char *Start = Str;
182 bool Quoted = ArgNeedsQuotes(Str);
183 unsigned int len = Quoted ? 2 : 0;
185 while (*Str != '\0') {
187 // We need to add a backslash, but ensure that it isn't escaped.
188 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
189 len += PrecedingEscapes + 1;
191 // Note that we *don't* need to escape runs of backslashes that don't
192 // precede a double quote! See MSDN:
193 // http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
200 // Make sure the closing quote doesn't get escaped by a trailing backslash.
201 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
202 len += PrecedingEscapes + 1;
210 static std::unique_ptr<char[]> flattenArgs(const char **args) {
211 // First, determine the length of the command line.
213 for (unsigned i = 0; args[i]; i++) {
214 len += ArgLenWithQuotes(args[i]) + 1;
217 // Now build the command line.
218 std::unique_ptr<char[]> command(new char[len+1]);
219 char *p = command.get();
221 for (unsigned i = 0; args[i]; i++) {
222 const char *arg = args[i];
223 const char *start = arg;
225 bool needsQuoting = ArgNeedsQuotes(arg);
229 while (*arg != '\0') {
231 // Escape all preceding escapes (if any), and then escape the quote.
232 p = EscapePrecedingEscapes(p, start, arg);
240 // Make sure our quote doesn't get escaped by a trailing backslash.
241 p = EscapePrecedingEscapes(p, start, arg);
251 static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
252 const char **envp, const StringRef **redirects,
253 unsigned memoryLimit, std::string *ErrMsg) {
254 if (!sys::fs::can_execute(Program)) {
256 *ErrMsg = "program not executable";
260 // can_execute may succeed by looking at Program + ".exe". CreateProcessW
261 // will implicitly add the .exe if we provide a command line without an
262 // executable path, but since we use an explicit executable, we have to add
264 SmallString<64> ProgramStorage;
265 if (!sys::fs::exists(Program))
266 Program = Twine(Program + ".exe").toStringRef(ProgramStorage);
268 // Windows wants a command line, not an array of args, to pass to the new
269 // process. We have to concatenate them all, while quoting the args that
270 // have embedded spaces (or are empty).
271 std::unique_ptr<char[]> command = flattenArgs(args);
273 // The pointer to the environment block for the new process.
274 std::vector<wchar_t> EnvBlock;
277 // An environment block consists of a null-terminated block of
278 // null-terminated strings. Convert the array of environment variables to
279 // an environment block by concatenating them.
280 for (unsigned i = 0; envp[i]; ++i) {
281 SmallVector<wchar_t, MAX_PATH> EnvString;
282 if (std::error_code ec = windows::UTF8ToUTF16(envp[i], EnvString)) {
283 SetLastError(ec.value());
284 MakeErrMsg(ErrMsg, "Unable to convert environment variable to UTF-16");
288 EnvBlock.insert(EnvBlock.end(), EnvString.begin(), EnvString.end());
289 EnvBlock.push_back(0);
291 EnvBlock.push_back(0);
294 // Create a child process.
296 memset(&si, 0, sizeof(si));
298 si.hStdInput = INVALID_HANDLE_VALUE;
299 si.hStdOutput = INVALID_HANDLE_VALUE;
300 si.hStdError = INVALID_HANDLE_VALUE;
303 si.dwFlags = STARTF_USESTDHANDLES;
305 si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
306 if (si.hStdInput == INVALID_HANDLE_VALUE) {
307 MakeErrMsg(ErrMsg, "can't redirect stdin");
310 si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
311 if (si.hStdOutput == INVALID_HANDLE_VALUE) {
312 CloseHandle(si.hStdInput);
313 MakeErrMsg(ErrMsg, "can't redirect stdout");
316 if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
317 // If stdout and stderr should go to the same place, redirect stderr
318 // to the handle already open for stdout.
319 if (!DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
320 GetCurrentProcess(), &si.hStdError,
321 0, TRUE, DUPLICATE_SAME_ACCESS)) {
322 CloseHandle(si.hStdInput);
323 CloseHandle(si.hStdOutput);
324 MakeErrMsg(ErrMsg, "can't dup stderr to stdout");
328 // Just redirect stderr
329 si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
330 if (si.hStdError == INVALID_HANDLE_VALUE) {
331 CloseHandle(si.hStdInput);
332 CloseHandle(si.hStdOutput);
333 MakeErrMsg(ErrMsg, "can't redirect stderr");
339 PROCESS_INFORMATION pi;
340 memset(&pi, 0, sizeof(pi));
345 SmallVector<wchar_t, MAX_PATH> ProgramUtf16;
346 if (std::error_code ec = path::widenPath(Program, ProgramUtf16)) {
347 SetLastError(ec.value());
349 std::string("Unable to convert application name to UTF-16"));
353 SmallVector<wchar_t, MAX_PATH> CommandUtf16;
354 if (std::error_code ec = windows::UTF8ToUTF16(command.get(), CommandUtf16)) {
355 SetLastError(ec.value());
357 std::string("Unable to convert command-line to UTF-16"));
361 BOOL rc = CreateProcessW(ProgramUtf16.data(), CommandUtf16.data(), 0, 0,
362 TRUE, CREATE_UNICODE_ENVIRONMENT,
363 EnvBlock.empty() ? 0 : EnvBlock.data(), 0, &si,
365 DWORD err = GetLastError();
367 // Regardless of whether the process got created or not, we are done with
368 // the handles we created for it to inherit.
369 CloseHandle(si.hStdInput);
370 CloseHandle(si.hStdOutput);
371 CloseHandle(si.hStdError);
373 // Now return an error if the process didn't get created.
376 MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
377 Program.str() + "'");
381 PI.Pid = pi.dwProcessId;
382 PI.ProcessHandle = pi.hProcess;
384 // Make sure these get closed no matter what.
385 ScopedCommonHandle hThread(pi.hThread);
387 // Assign the process to a job if a memory limit is defined.
388 ScopedJobHandle hJob;
389 if (memoryLimit != 0) {
390 hJob = CreateJobObjectW(0, 0);
391 bool success = false;
393 JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
394 memset(&jeli, 0, sizeof(jeli));
395 jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
396 jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
397 if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
398 &jeli, sizeof(jeli))) {
399 if (AssignProcessToJobObject(hJob, pi.hProcess))
404 SetLastError(GetLastError());
405 MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
406 TerminateProcess(pi.hProcess, 1);
407 WaitForSingleObject(pi.hProcess, INFINITE);
416 ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
417 bool WaitUntilChildTerminates, std::string *ErrMsg) {
418 assert(PI.Pid && "invalid pid to wait on, process not started?");
419 assert(PI.ProcessHandle &&
420 "invalid process handle to wait on, process not started?");
421 DWORD milliSecondsToWait = 0;
422 if (WaitUntilChildTerminates)
423 milliSecondsToWait = INFINITE;
424 else if (SecondsToWait > 0)
425 milliSecondsToWait = SecondsToWait * 1000;
427 ProcessInfo WaitResult = PI;
428 DWORD WaitStatus = WaitForSingleObject(PI.ProcessHandle, milliSecondsToWait);
429 if (WaitStatus == WAIT_TIMEOUT) {
431 if (!TerminateProcess(PI.ProcessHandle, 1)) {
433 MakeErrMsg(ErrMsg, "Failed to terminate timed-out program");
435 // -2 indicates a crash or timeout as opposed to failure to execute.
436 WaitResult.ReturnCode = -2;
437 CloseHandle(PI.ProcessHandle);
440 WaitForSingleObject(PI.ProcessHandle, INFINITE);
441 CloseHandle(PI.ProcessHandle);
443 // Non-blocking wait.
444 return ProcessInfo();
448 // Get its exit status.
450 BOOL rc = GetExitCodeProcess(PI.ProcessHandle, &status);
451 DWORD err = GetLastError();
452 if (err != ERROR_INVALID_HANDLE)
453 CloseHandle(PI.ProcessHandle);
458 MakeErrMsg(ErrMsg, "Failed getting status for program");
460 // -2 indicates a crash or timeout as opposed to failure to execute.
461 WaitResult.ReturnCode = -2;
468 // Pass 10(Warning) and 11(Error) to the callee as negative value.
469 if ((status & 0xBFFF0000U) == 0x80000000U)
470 WaitResult.ReturnCode = static_cast<int>(status);
471 else if (status & 0xFF)
472 WaitResult.ReturnCode = status & 0x7FFFFFFF;
474 WaitResult.ReturnCode = 1;
479 std::error_code sys::ChangeStdinToBinary() {
480 int result = _setmode(_fileno(stdin), _O_BINARY);
482 return std::error_code(errno, std::generic_category());
483 return std::error_code();
486 std::error_code sys::ChangeStdoutToBinary() {
487 int result = _setmode(_fileno(stdout), _O_BINARY);
489 return std::error_code(errno, std::generic_category());
490 return std::error_code();
494 llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
495 WindowsEncodingMethod Encoding) {
497 llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::F_Text);
501 if (Encoding == WEM_UTF8) {
503 } else if (Encoding == WEM_CurrentCodePage) {
504 SmallVector<wchar_t, 1> ArgsUTF16;
505 SmallVector<char, 1> ArgsCurCP;
507 if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
510 if ((EC = windows::UTF16ToCurCP(
511 ArgsUTF16.data(), ArgsUTF16.size(), ArgsCurCP)))
514 OS.write(ArgsCurCP.data(), ArgsCurCP.size());
515 } else if (Encoding == WEM_UTF16) {
516 SmallVector<wchar_t, 1> ArgsUTF16;
518 if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
521 // Endianness guessing
523 uint16_t src = UNI_UTF16_BYTE_ORDER_MARK_NATIVE;
524 memcpy(BOM, &src, 2);
526 OS.write((char *)ArgsUTF16.data(), ArgsUTF16.size() << 1);
528 llvm_unreachable("Unknown encoding");
532 return make_error_code(errc::io_error);
537 bool llvm::sys::commandLineFitsWithinSystemLimits(StringRef Program, ArrayRef<const char*> Args) {
538 // The documented max length of the command line passed to CreateProcess.
539 static const size_t MaxCommandStringLength = 32768;
540 // Account for the trailing space for the program path and the
541 // trailing NULL of the last argument.
542 size_t ArgLength = ArgLenWithQuotes(Program.str().c_str()) + 2;
543 for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
545 // Account for the trailing space for every arg
546 ArgLength += ArgLenWithQuotes(*I) + 1;
547 if (ArgLength > MaxCommandStringLength) {