aboutsummaryrefslogtreecommitdiffstats
path: root/lib/Support/Windows/Program.inc
blob: c3700774514c35f15f29a8ed75c9ce3f657a6631 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
//===- Win32/Program.cpp - Win32 Program Implementation ------- -*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Program class.
//
//===----------------------------------------------------------------------===//

#include "WindowsSupport.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/WindowsError.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
#include <fcntl.h>
#include <io.h>
#include <malloc.h>

//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//===          and must not be UNIX code
//===----------------------------------------------------------------------===//

namespace llvm {
using namespace sys;

ProcessInfo::ProcessInfo() : ProcessHandle(0), Pid(0), ReturnCode(0) {}

ErrorOr<std::string> sys::findProgramByName(StringRef Name,
                                            ArrayRef<StringRef> Paths) {
  assert(!Name.empty() && "Must have a name!");

  if (Name.find_first_of("/\\") != StringRef::npos)
    return std::string(Name);

  const wchar_t *Path = nullptr;
  std::wstring PathStorage;
  if (!Paths.empty()) {
    PathStorage.reserve(Paths.size() * MAX_PATH);
    for (unsigned i = 0; i < Paths.size(); ++i) {
      if (i)
        PathStorage.push_back(L';');
      StringRef P = Paths[i];
      SmallVector<wchar_t, MAX_PATH> TmpPath;
      if (std::error_code EC = windows::UTF8ToUTF16(P, TmpPath))
        return EC;
      PathStorage.append(TmpPath.begin(), TmpPath.end());
    }
    Path = PathStorage.c_str();
  }

  SmallVector<wchar_t, MAX_PATH> U16Name;
  if (std::error_code EC = windows::UTF8ToUTF16(Name, U16Name))
    return EC;

  SmallVector<StringRef, 12> PathExts;
  PathExts.push_back("");
  PathExts.push_back(".exe"); // FIXME: This must be in %PATHEXT%.
  if (const char *PathExtEnv = std::getenv("PATHEXT"))
    SplitString(PathExtEnv, PathExts, ";");

  SmallVector<wchar_t, MAX_PATH> U16Result;
  DWORD Len = MAX_PATH;
  for (StringRef Ext : PathExts) {
    SmallVector<wchar_t, MAX_PATH> U16Ext;
    if (std::error_code EC = windows::UTF8ToUTF16(Ext, U16Ext))
      return EC;

    do {
      U16Result.reserve(Len);
      Len = ::SearchPathW(Path, c_str(U16Name),
                          U16Ext.empty() ? nullptr : c_str(U16Ext),
                          U16Result.capacity(), U16Result.data(), nullptr);
    } while (Len > U16Result.capacity());

    if (Len != 0)
      break; // Found it.
  }

  if (Len == 0)
    return mapWindowsError(::GetLastError());

  U16Result.set_size(Len);

  SmallVector<char, MAX_PATH> U8Result;
  if (std::error_code EC =
          windows::UTF16ToUTF8(U16Result.data(), U16Result.size(), U8Result))
    return EC;

  return std::string(U8Result.begin(), U8Result.end());
}

static HANDLE RedirectIO(const StringRef *path, int fd, std::string* ErrMsg) {
  HANDLE h;
  if (path == 0) {
    if (!DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
                         GetCurrentProcess(), &h,
                         0, TRUE, DUPLICATE_SAME_ACCESS))
      return INVALID_HANDLE_VALUE;
    return h;
  }

  std::string fname;
  if (path->empty())
    fname = "NUL";
  else
    fname = *path;

  SECURITY_ATTRIBUTES sa;
  sa.nLength = sizeof(sa);
  sa.lpSecurityDescriptor = 0;
  sa.bInheritHandle = TRUE;

  SmallVector<wchar_t, 128> fnameUnicode;
  if (path->empty()) {
    // Don't play long-path tricks on "NUL".
    if (windows::UTF8ToUTF16(fname, fnameUnicode))
      return INVALID_HANDLE_VALUE;
  } else {
    if (path::widenPath(fname, fnameUnicode))
      return INVALID_HANDLE_VALUE;
  }
  h = CreateFileW(fnameUnicode.data(), fd ? GENERIC_WRITE : GENERIC_READ,
                  FILE_SHARE_READ, &sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
                  FILE_ATTRIBUTE_NORMAL, NULL);
  if (h == INVALID_HANDLE_VALUE) {
    MakeErrMsg(ErrMsg, fname + ": Can't open file for " +
        (fd ? "input: " : "output: "));
  }

  return h;
}

/// ArgNeedsQuotes - Check whether argument needs to be quoted when calling
/// CreateProcess.
static bool ArgNeedsQuotes(const char *Str) {
  return Str[0] == '\0' || strpbrk(Str, "\t \"&\'()*<>\\`^|") != 0;
}

/// CountPrecedingBackslashes - Returns the number of backslashes preceding Cur
/// in the C string Start.
static unsigned int CountPrecedingBackslashes(const char *Start,
                                              const char *Cur) {
  unsigned int Count = 0;
  --Cur;
  while (Cur >= Start && *Cur == '\\') {
    ++Count;
    --Cur;
  }
  return Count;
}

/// EscapePrecedingEscapes - Append a backslash to Dst for every backslash
/// preceding Cur in the Start string.  Assumes Dst has enough space.
static char *EscapePrecedingEscapes(char *Dst, const char *Start,
                                    const char *Cur) {
  unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Cur);
  while (PrecedingEscapes > 0) {
    *Dst++ = '\\';
    --PrecedingEscapes;
  }
  return Dst;
}

/// ArgLenWithQuotes - Check whether argument needs to be quoted when calling
/// CreateProcess and returns length of quoted arg with escaped quotes
static unsigned int ArgLenWithQuotes(const char *Str) {
  const char *Start = Str;
  bool Quoted = ArgNeedsQuotes(Str);
  unsigned int len = Quoted ? 2 : 0;

  while (*Str != '\0') {
    if (*Str == '\"') {
      // We need to add a backslash, but ensure that it isn't escaped.
      unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
      len += PrecedingEscapes + 1;
    }
    // Note that we *don't* need to escape runs of backslashes that don't
    // precede a double quote!  See MSDN:
    // http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx

    ++len;
    ++Str;
  }

  if (Quoted) {
    // Make sure the closing quote doesn't get escaped by a trailing backslash.
    unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
    len += PrecedingEscapes + 1;
  }

  return len;
}

}

static std::unique_ptr<char[]> flattenArgs(const char **args) {
  // First, determine the length of the command line.
  unsigned len = 0;
  for (unsigned i = 0; args[i]; i++) {
    len += ArgLenWithQuotes(args[i]) + 1;
  }

  // Now build the command line.
  std::unique_ptr<char[]> command(new char[len+1]);
  char *p = command.get();

  for (unsigned i = 0; args[i]; i++) {
    const char *arg = args[i];
    const char *start = arg;

    bool needsQuoting = ArgNeedsQuotes(arg);
    if (needsQuoting)
      *p++ = '"';

    while (*arg != '\0') {
      if (*arg == '\"') {
        // Escape all preceding escapes (if any), and then escape the quote.
        p = EscapePrecedingEscapes(p, start, arg);
        *p++ = '\\';
      }

      *p++ = *arg++;
    }

    if (needsQuoting) {
      // Make sure our quote doesn't get escaped by a trailing backslash.
      p = EscapePrecedingEscapes(p, start, arg);
      *p++ = '"';
    }
    *p++ = ' ';
  }

  *p = 0;
  return command;
}

static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
                    const char **envp, const StringRef **redirects,
                    unsigned memoryLimit, std::string *ErrMsg) {
  if (!sys::fs::can_execute(Program)) {
    if (ErrMsg)
      *ErrMsg = "program not executable";
    return false;
  }

  // Windows wants a command line, not an array of args, to pass to the new
  // process.  We have to concatenate them all, while quoting the args that
  // have embedded spaces (or are empty).
  std::unique_ptr<char[]> command = flattenArgs(args);

  // The pointer to the environment block for the new process.
  std::vector<wchar_t> EnvBlock;

  if (envp) {
    // An environment block consists of a null-terminated block of
    // null-terminated strings. Convert the array of environment variables to
    // an environment block by concatenating them.
    for (unsigned i = 0; envp[i]; ++i) {
      SmallVector<wchar_t, MAX_PATH> EnvString;
      if (std::error_code ec = windows::UTF8ToUTF16(envp[i], EnvString)) {
        SetLastError(ec.value());
        MakeErrMsg(ErrMsg, "Unable to convert environment variable to UTF-16");
        return false;
      }

      EnvBlock.insert(EnvBlock.end(), EnvString.begin(), EnvString.end());
      EnvBlock.push_back(0);
    }
    EnvBlock.push_back(0);
  }

  // Create a child process.
  STARTUPINFOW si;
  memset(&si, 0, sizeof(si));
  si.cb = sizeof(si);
  si.hStdInput = INVALID_HANDLE_VALUE;
  si.hStdOutput = INVALID_HANDLE_VALUE;
  si.hStdError = INVALID_HANDLE_VALUE;

  if (redirects) {
    si.dwFlags = STARTF_USESTDHANDLES;

    si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
    if (si.hStdInput == INVALID_HANDLE_VALUE) {
      MakeErrMsg(ErrMsg, "can't redirect stdin");
      return false;
    }
    si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
    if (si.hStdOutput == INVALID_HANDLE_VALUE) {
      CloseHandle(si.hStdInput);
      MakeErrMsg(ErrMsg, "can't redirect stdout");
      return false;
    }
    if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
      // If stdout and stderr should go to the same place, redirect stderr
      // to the handle already open for stdout.
      if (!DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
                           GetCurrentProcess(), &si.hStdError,
                           0, TRUE, DUPLICATE_SAME_ACCESS)) {
        CloseHandle(si.hStdInput);
        CloseHandle(si.hStdOutput);
        MakeErrMsg(ErrMsg, "can't dup stderr to stdout");
        return false;
      }
    } else {
      // Just redirect stderr
      si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
      if (si.hStdError == INVALID_HANDLE_VALUE) {
        CloseHandle(si.hStdInput);
        CloseHandle(si.hStdOutput);
        MakeErrMsg(ErrMsg, "can't redirect stderr");
        return false;
      }
    }
  }

  PROCESS_INFORMATION pi;
  memset(&pi, 0, sizeof(pi));

  fflush(stdout);
  fflush(stderr);

  SmallVector<wchar_t, MAX_PATH> ProgramUtf16;
  if (std::error_code ec = path::widenPath(Program, ProgramUtf16)) {
    SetLastError(ec.value());
    MakeErrMsg(ErrMsg,
               std::string("Unable to convert application name to UTF-16"));
    return false;
  }

  SmallVector<wchar_t, MAX_PATH> CommandUtf16;
  if (std::error_code ec = windows::UTF8ToUTF16(command.get(), CommandUtf16)) {
    SetLastError(ec.value());
    MakeErrMsg(ErrMsg,
               std::string("Unable to convert command-line to UTF-16"));
    return false;
  }

  BOOL rc = CreateProcessW(ProgramUtf16.data(), CommandUtf16.data(), 0, 0,
                           TRUE, CREATE_UNICODE_ENVIRONMENT,
                           EnvBlock.empty() ? 0 : EnvBlock.data(), 0, &si,
                           &pi);
  DWORD err = GetLastError();

  // Regardless of whether the process got created or not, we are done with
  // the handles we created for it to inherit.
  CloseHandle(si.hStdInput);
  CloseHandle(si.hStdOutput);
  CloseHandle(si.hStdError);

  // Now return an error if the process didn't get created.
  if (!rc) {
    SetLastError(err);
    MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
               Program.str() + "'");
    return false;
  }

  PI.Pid = pi.dwProcessId;
  PI.ProcessHandle = pi.hProcess;

  // Make sure these get closed no matter what.
  ScopedCommonHandle hThread(pi.hThread);

  // Assign the process to a job if a memory limit is defined.
  ScopedJobHandle hJob;
  if (memoryLimit != 0) {
    hJob = CreateJobObjectW(0, 0);
    bool success = false;
    if (hJob) {
      JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
      memset(&jeli, 0, sizeof(jeli));
      jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
      jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
      if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
                                  &jeli, sizeof(jeli))) {
        if (AssignProcessToJobObject(hJob, pi.hProcess))
          success = true;
      }
    }
    if (!success) {
      SetLastError(GetLastError());
      MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
      TerminateProcess(pi.hProcess, 1);
      WaitForSingleObject(pi.hProcess, INFINITE);
      return false;
    }
  }

  return true;
}

namespace llvm {
ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
                      bool WaitUntilChildTerminates, std::string *ErrMsg) {
  assert(PI.Pid && "invalid pid to wait on, process not started?");
  assert(PI.ProcessHandle &&
         "invalid process handle to wait on, process not started?");
  DWORD milliSecondsToWait = 0;
  if (WaitUntilChildTerminates)
    milliSecondsToWait = INFINITE;
  else if (SecondsToWait > 0)
    milliSecondsToWait = SecondsToWait * 1000;

  ProcessInfo WaitResult = PI;
  DWORD WaitStatus = WaitForSingleObject(PI.ProcessHandle, milliSecondsToWait);
  if (WaitStatus == WAIT_TIMEOUT) {
    if (SecondsToWait) {
      if (!TerminateProcess(PI.ProcessHandle, 1)) {
        if (ErrMsg)
          MakeErrMsg(ErrMsg, "Failed to terminate timed-out program.");

        // -2 indicates a crash or timeout as opposed to failure to execute.
        WaitResult.ReturnCode = -2;
        CloseHandle(PI.ProcessHandle);
        return WaitResult;
      }
      WaitForSingleObject(PI.ProcessHandle, INFINITE);
      CloseHandle(PI.ProcessHandle);
    } else {
      // Non-blocking wait.
      return ProcessInfo();
    }
  }

  // Get its exit status.
  DWORD status;
  BOOL rc = GetExitCodeProcess(PI.ProcessHandle, &status);
  DWORD err = GetLastError();
  CloseHandle(PI.ProcessHandle);

  if (!rc) {
    SetLastError(err);
    if (ErrMsg)
      MakeErrMsg(ErrMsg, "Failed getting status for program.");

    // -2 indicates a crash or timeout as opposed to failure to execute.
    WaitResult.ReturnCode = -2;
    return WaitResult;
  }

  if (!status)
    return WaitResult;

  // Pass 10(Warning) and 11(Error) to the callee as negative value.
  if ((status & 0xBFFF0000U) == 0x80000000U)
    WaitResult.ReturnCode = static_cast<int>(status);
  else if (status & 0xFF)
    WaitResult.ReturnCode = status & 0x7FFFFFFF;
  else
    WaitResult.ReturnCode = 1;

  return WaitResult;
}

std::error_code sys::ChangeStdinToBinary() {
  int result = _setmode(_fileno(stdin), _O_BINARY);
  if (result == -1)
    return std::error_code(errno, std::generic_category());
  return std::error_code();
}

std::error_code sys::ChangeStdoutToBinary() {
  int result = _setmode(_fileno(stdout), _O_BINARY);
  if (result == -1)
    return std::error_code(errno, std::generic_category());
  return std::error_code();
}

std::error_code
llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
                                 WindowsEncodingMethod Encoding) {
  std::error_code EC;
  llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::F_Text);
  if (EC)
    return EC;

  if (Encoding == WEM_UTF8) {
    OS << Contents;
  } else if (Encoding == WEM_CurrentCodePage) {
    SmallVector<wchar_t, 1> ArgsUTF16;
    SmallVector<char, 1> ArgsCurCP;

    if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
      return EC;

    if ((EC = windows::UTF16ToCurCP(
             ArgsUTF16.data(), ArgsUTF16.size(), ArgsCurCP)))
      return EC;

    OS.write(ArgsCurCP.data(), ArgsCurCP.size());
  } else if (Encoding == WEM_UTF16) {
    SmallVector<wchar_t, 1> ArgsUTF16;

    if ((EC = windows::UTF8ToUTF16(Contents, ArgsUTF16)))
      return EC;

    // Endianness guessing
    char BOM[2];
    uint16_t src = UNI_UTF16_BYTE_ORDER_MARK_NATIVE;
    memcpy(BOM, &src, 2);
    OS.write(BOM, 2);
    OS.write((char *)ArgsUTF16.data(), ArgsUTF16.size() << 1);
  } else {
    llvm_unreachable("Unknown encoding");
  }

  if (OS.has_error())
    return std::make_error_code(std::errc::io_error);

  return EC;
}

bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
  // The documented max length of the command line passed to CreateProcess.
  static const size_t MaxCommandStringLength = 32768;
  size_t ArgLength = 0;
  for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
       I != E; ++I) {
    // Account for the trailing space for every arg but the last one and the
    // trailing NULL of the last argument.
    ArgLength += ArgLenWithQuotes(*I) + 1;
    if (ArgLength > MaxCommandStringLength) {
      return false;
    }
  }
  return true;
}
}