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/Support/FileSystem.h"
21 //===----------------------------------------------------------------------===//
22 //=== WARNING: Implementation here must contain only Win32 specific code
23 //=== and must not be UNIX code
24 //===----------------------------------------------------------------------===//
29 ProcessInfo::ProcessInfo() : ProcessHandle(0), Pid(0), ReturnCode(0) {}
31 // This function just uses the PATH environment variable to find the program.
32 std::string sys::FindProgramByName(const std::string &progName) {
33 // Check some degenerate cases
34 if (progName.length() == 0) // no program
36 std::string temp = progName;
37 // Return paths with slashes verbatim.
38 if (progName.find('\\') != std::string::npos ||
39 progName.find('/') != std::string::npos)
42 // At this point, the file name is valid and does not contain slashes.
43 // Let Windows search for it.
44 SmallVector<wchar_t, MAX_PATH> progNameUnicode;
45 if (windows::UTF8ToUTF16(progName, progNameUnicode))
48 SmallVector<wchar_t, MAX_PATH> buffer;
52 len = ::SearchPathW(NULL, progNameUnicode.data(), L".exe",
53 buffer.capacity(), buffer.data(), NULL);
55 // See if it wasn't found.
59 // Buffer was too small; grow and retry.
60 } while (len > buffer.capacity());
63 SmallVector<char, MAX_PATH> result;
64 if (windows::UTF16ToUTF8(buffer.begin(), buffer.size(), result))
67 return std::string(result.data(), result.size());
70 static HANDLE RedirectIO(const StringRef *path, int fd, std::string* ErrMsg) {
73 if (!DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
74 GetCurrentProcess(), &h,
75 0, TRUE, DUPLICATE_SAME_ACCESS))
76 return INVALID_HANDLE_VALUE;
86 SECURITY_ATTRIBUTES sa;
87 sa.nLength = sizeof(sa);
88 sa.lpSecurityDescriptor = 0;
89 sa.bInheritHandle = TRUE;
91 SmallVector<wchar_t, 128> fnameUnicode;
92 if (windows::UTF8ToUTF16(fname, fnameUnicode))
93 return INVALID_HANDLE_VALUE;
95 h = CreateFileW(fnameUnicode.data(), fd ? GENERIC_WRITE : GENERIC_READ,
96 FILE_SHARE_READ, &sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
97 FILE_ATTRIBUTE_NORMAL, NULL);
98 if (h == INVALID_HANDLE_VALUE) {
99 MakeErrMsg(ErrMsg, std::string(fname) + ": Can't open file for " +
100 (fd ? "input: " : "output: "));
106 /// ArgNeedsQuotes - Check whether argument needs to be quoted when calling
108 static bool ArgNeedsQuotes(const char *Str) {
109 return Str[0] == '\0' || strpbrk(Str, "\t \"&\'()*<>\\`^|") != 0;
112 /// CountPrecedingBackslashes - Returns the number of backslashes preceding Cur
113 /// in the C string Start.
114 static unsigned int CountPrecedingBackslashes(const char *Start,
116 unsigned int Count = 0;
118 while (Cur >= Start && *Cur == '\\') {
125 /// EscapePrecedingEscapes - Append a backslash to Dst for every backslash
126 /// preceding Cur in the Start string. Assumes Dst has enough space.
127 static char *EscapePrecedingEscapes(char *Dst, const char *Start,
129 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Cur);
130 while (PrecedingEscapes > 0) {
137 /// ArgLenWithQuotes - Check whether argument needs to be quoted when calling
138 /// CreateProcess and returns length of quoted arg with escaped quotes
139 static unsigned int ArgLenWithQuotes(const char *Str) {
140 const char *Start = Str;
141 bool Quoted = ArgNeedsQuotes(Str);
142 unsigned int len = Quoted ? 2 : 0;
144 while (*Str != '\0') {
146 // We need to add a backslash, but ensure that it isn't escaped.
147 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
148 len += PrecedingEscapes + 1;
150 // Note that we *don't* need to escape runs of backslashes that don't
151 // precede a double quote! See MSDN:
152 // http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
159 // Make sure the closing quote doesn't get escaped by a trailing backslash.
160 unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
161 len += PrecedingEscapes + 1;
169 static std::unique_ptr<char[]> flattenArgs(const char **args) {
170 // First, determine the length of the command line.
172 for (unsigned i = 0; args[i]; i++) {
173 len += ArgLenWithQuotes(args[i]) + 1;
176 // Now build the command line.
177 std::unique_ptr<char[]> command(new char[len+1]);
178 char *p = command.get();
180 for (unsigned i = 0; args[i]; i++) {
181 const char *arg = args[i];
182 const char *start = arg;
184 bool needsQuoting = ArgNeedsQuotes(arg);
188 while (*arg != '\0') {
190 // Escape all preceding escapes (if any), and then escape the quote.
191 p = EscapePrecedingEscapes(p, start, arg);
199 // Make sure our quote doesn't get escaped by a trailing backslash.
200 p = EscapePrecedingEscapes(p, start, arg);
210 static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
211 const char **envp, const StringRef **redirects,
212 unsigned memoryLimit, std::string *ErrMsg) {
213 if (!sys::fs::can_execute(Program)) {
215 *ErrMsg = "program not executable";
219 // Windows wants a command line, not an array of args, to pass to the new
220 // process. We have to concatenate them all, while quoting the args that
221 // have embedded spaces (or are empty).
222 std::unique_ptr<char[]> command = flattenArgs(args);
224 // The pointer to the environment block for the new process.
225 std::vector<wchar_t> EnvBlock;
228 // An environment block consists of a null-terminated block of
229 // null-terminated strings. Convert the array of environment variables to
230 // an environment block by concatenating them.
231 for (unsigned i = 0; envp[i]; ++i) {
232 SmallVector<wchar_t, MAX_PATH> EnvString;
233 if (std::error_code ec = windows::UTF8ToUTF16(envp[i], EnvString)) {
234 SetLastError(ec.value());
235 MakeErrMsg(ErrMsg, "Unable to convert environment variable to UTF-16");
239 EnvBlock.insert(EnvBlock.end(), EnvString.begin(), EnvString.end());
240 EnvBlock.push_back(0);
242 EnvBlock.push_back(0);
245 // Create a child process.
247 memset(&si, 0, sizeof(si));
249 si.hStdInput = INVALID_HANDLE_VALUE;
250 si.hStdOutput = INVALID_HANDLE_VALUE;
251 si.hStdError = INVALID_HANDLE_VALUE;
254 si.dwFlags = STARTF_USESTDHANDLES;
256 si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
257 if (si.hStdInput == INVALID_HANDLE_VALUE) {
258 MakeErrMsg(ErrMsg, "can't redirect stdin");
261 si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
262 if (si.hStdOutput == INVALID_HANDLE_VALUE) {
263 CloseHandle(si.hStdInput);
264 MakeErrMsg(ErrMsg, "can't redirect stdout");
267 if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
268 // If stdout and stderr should go to the same place, redirect stderr
269 // to the handle already open for stdout.
270 if (!DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
271 GetCurrentProcess(), &si.hStdError,
272 0, TRUE, DUPLICATE_SAME_ACCESS)) {
273 CloseHandle(si.hStdInput);
274 CloseHandle(si.hStdOutput);
275 MakeErrMsg(ErrMsg, "can't dup stderr to stdout");
279 // Just redirect stderr
280 si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
281 if (si.hStdError == INVALID_HANDLE_VALUE) {
282 CloseHandle(si.hStdInput);
283 CloseHandle(si.hStdOutput);
284 MakeErrMsg(ErrMsg, "can't redirect stderr");
290 PROCESS_INFORMATION pi;
291 memset(&pi, 0, sizeof(pi));
296 SmallVector<wchar_t, MAX_PATH> ProgramUtf16;
297 if (std::error_code ec = windows::UTF8ToUTF16(Program, ProgramUtf16)) {
298 SetLastError(ec.value());
300 std::string("Unable to convert application name to UTF-16"));
304 SmallVector<wchar_t, MAX_PATH> CommandUtf16;
305 if (std::error_code ec = windows::UTF8ToUTF16(command.get(), CommandUtf16)) {
306 SetLastError(ec.value());
308 std::string("Unable to convert command-line to UTF-16"));
312 BOOL rc = CreateProcessW(ProgramUtf16.data(), CommandUtf16.data(), 0, 0,
313 TRUE, CREATE_UNICODE_ENVIRONMENT,
314 EnvBlock.empty() ? 0 : EnvBlock.data(), 0, &si,
316 DWORD err = GetLastError();
318 // Regardless of whether the process got created or not, we are done with
319 // the handles we created for it to inherit.
320 CloseHandle(si.hStdInput);
321 CloseHandle(si.hStdOutput);
322 CloseHandle(si.hStdError);
324 // Now return an error if the process didn't get created.
327 MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
328 Program.str() + "'");
332 PI.Pid = pi.dwProcessId;
333 PI.ProcessHandle = pi.hProcess;
335 // Make sure these get closed no matter what.
336 ScopedCommonHandle hThread(pi.hThread);
338 // Assign the process to a job if a memory limit is defined.
339 ScopedJobHandle hJob;
340 if (memoryLimit != 0) {
341 hJob = CreateJobObjectW(0, 0);
342 bool success = false;
344 JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
345 memset(&jeli, 0, sizeof(jeli));
346 jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
347 jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
348 if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
349 &jeli, sizeof(jeli))) {
350 if (AssignProcessToJobObject(hJob, pi.hProcess))
355 SetLastError(GetLastError());
356 MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
357 TerminateProcess(pi.hProcess, 1);
358 WaitForSingleObject(pi.hProcess, INFINITE);
367 ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
368 bool WaitUntilChildTerminates, std::string *ErrMsg) {
369 assert(PI.Pid && "invalid pid to wait on, process not started?");
370 assert(PI.ProcessHandle &&
371 "invalid process handle to wait on, process not started?");
372 DWORD milliSecondsToWait = 0;
373 if (WaitUntilChildTerminates)
374 milliSecondsToWait = INFINITE;
375 else if (SecondsToWait > 0)
376 milliSecondsToWait = SecondsToWait * 1000;
378 ProcessInfo WaitResult = PI;
379 DWORD WaitStatus = WaitForSingleObject(PI.ProcessHandle, milliSecondsToWait);
380 if (WaitStatus == WAIT_TIMEOUT) {
382 if (!TerminateProcess(PI.ProcessHandle, 1)) {
384 MakeErrMsg(ErrMsg, "Failed to terminate timed-out program.");
386 // -2 indicates a crash or timeout as opposed to failure to execute.
387 WaitResult.ReturnCode = -2;
388 CloseHandle(PI.ProcessHandle);
391 WaitForSingleObject(PI.ProcessHandle, INFINITE);
392 CloseHandle(PI.ProcessHandle);
394 // Non-blocking wait.
395 return ProcessInfo();
399 // Get its exit status.
401 BOOL rc = GetExitCodeProcess(PI.ProcessHandle, &status);
402 DWORD err = GetLastError();
403 CloseHandle(PI.ProcessHandle);
408 MakeErrMsg(ErrMsg, "Failed getting status for program.");
410 // -2 indicates a crash or timeout as opposed to failure to execute.
411 WaitResult.ReturnCode = -2;
418 // Pass 10(Warning) and 11(Error) to the callee as negative value.
419 if ((status & 0xBFFF0000U) == 0x80000000U)
420 WaitResult.ReturnCode = static_cast<int>(status);
421 else if (status & 0xFF)
422 WaitResult.ReturnCode = status & 0x7FFFFFFF;
424 WaitResult.ReturnCode = 1;
429 std::error_code sys::ChangeStdinToBinary(){
430 int result = _setmode( _fileno(stdin), _O_BINARY );
432 return std::error_code(errno, std::generic_category());
433 return std::error_code();
436 std::error_code sys::ChangeStdoutToBinary(){
437 int result = _setmode( _fileno(stdout), _O_BINARY );
439 return std::error_code(errno, std::generic_category());
440 return std::error_code();
443 bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
444 // The documented max length of the command line passed to CreateProcess.
445 static const size_t MaxCommandStringLength = 32768;
446 size_t ArgLength = 0;
447 for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
449 // Account for the trailing space for every arg but the last one and the
450 // trailing NULL of the last argument.
451 ArgLength += ArgLenWithQuotes(*I) + 1;
452 if (ArgLength > MaxCommandStringLength) {