xref: /freebsd/contrib/llvm-project/llvm/lib/Support/Windows/Process.inc (revision 833a452e9f082a7982a31c21f0da437dbbe0a39d) 
1//===- Win32/Process.cpp - Win32 Process Implementation ------- -*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file provides the Win32 specific implementation of the Process class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/Support/Allocator.h"
14#include "llvm/Support/CommandLine.h"
15#include "llvm/Support/ConvertUTF.h"
16#include "llvm/Support/ErrorHandling.h"
17#include "llvm/Support/StringSaver.h"
18#include "llvm/Support/WindowsError.h"
19#include <malloc.h>
20
21// The Windows.h header must be after LLVM and standard headers.
22#include "llvm/Support/Windows/WindowsSupport.h"
23
24#include <direct.h>
25#include <io.h>
26#include <psapi.h>
27#include <shellapi.h>
28
29#if !defined(__MINGW32__)
30 #pragma comment(lib, "psapi.lib")
31 #pragma comment(lib, "shell32.lib")
32#endif
33
34//===----------------------------------------------------------------------===//
35//=== WARNING: Implementation here must contain only Win32 specific code
36//===          and must not be UNIX code
37//===----------------------------------------------------------------------===//
38
39#ifdef __MINGW32__
40// This ban should be lifted when MinGW 1.0+ has defined this value.
41#  define _HEAPOK (-2)
42#endif
43
44using namespace llvm;
45
46Process::Pid Process::getProcessId() {
47  static_assert(sizeof(Pid) >= sizeof(DWORD),
48                "Process::Pid should be big enough to store DWORD");
49  return Pid(::GetCurrentProcessId());
50}
51
52// This function retrieves the page size using GetNativeSystemInfo() and is
53// present solely so it can be called once to initialize the self_process member
54// below.
55static unsigned computePageSize() {
56  // GetNativeSystemInfo() provides the physical page size which may differ
57  // from GetSystemInfo() in 32-bit applications running under WOW64.
58  SYSTEM_INFO info;
59  GetNativeSystemInfo(&info);
60  // FIXME: FileOffset in MapViewOfFile() should be aligned to not dwPageSize,
61  // but dwAllocationGranularity.
62  return static_cast<unsigned>(info.dwPageSize);
63}
64
65Expected<unsigned> Process::getPageSize() {
66  static unsigned Ret = computePageSize();
67  return Ret;
68}
69
70size_t
71Process::GetMallocUsage()
72{
73  _HEAPINFO hinfo;
74  hinfo._pentry = NULL;
75
76  size_t size = 0;
77
78  while (_heapwalk(&hinfo) == _HEAPOK)
79    size += hinfo._size;
80
81  return size;
82}
83
84void Process::GetTimeUsage(TimePoint<> &elapsed, std::chrono::nanoseconds &user_time,
85                           std::chrono::nanoseconds &sys_time) {
86  elapsed = std::chrono::system_clock::now();;
87
88  FILETIME ProcCreate, ProcExit, KernelTime, UserTime;
89  if (GetProcessTimes(GetCurrentProcess(), &ProcCreate, &ProcExit, &KernelTime,
90                      &UserTime) == 0)
91    return;
92
93  user_time = toDuration(UserTime);
94  sys_time = toDuration(KernelTime);
95}
96
97// Some LLVM programs such as bugpoint produce core files as a normal part of
98// their operation. To prevent the disk from filling up, this configuration
99// item does what's necessary to prevent their generation.
100void Process::PreventCoreFiles() {
101  // Windows does have the concept of core files, called minidumps.  However,
102  // disabling minidumps for a particular application extends past the lifetime
103  // of that application, which is the incorrect behavior for this API.
104  // Additionally, the APIs require elevated privileges to disable and re-
105  // enable minidumps, which makes this untenable. For more information, see
106  // WerAddExcludedApplication and WerRemoveExcludedApplication (Vista and
107  // later).
108  //
109  // Windows also has modal pop-up message boxes.  As this method is used by
110  // bugpoint, preventing these pop-ups is additionally important.
111  SetErrorMode(SEM_FAILCRITICALERRORS |
112               SEM_NOGPFAULTERRORBOX |
113               SEM_NOOPENFILEERRORBOX);
114
115  coreFilesPrevented = true;
116}
117
118/// Returns the environment variable \arg Name's value as a string encoded in
119/// UTF-8. \arg Name is assumed to be in UTF-8 encoding.
120Optional<std::string> Process::GetEnv(StringRef Name) {
121  // Convert the argument to UTF-16 to pass it to _wgetenv().
122  SmallVector<wchar_t, 128> NameUTF16;
123  if (windows::UTF8ToUTF16(Name, NameUTF16))
124    return None;
125
126  // Environment variable can be encoded in non-UTF8 encoding, and there's no
127  // way to know what the encoding is. The only reliable way to look up
128  // multibyte environment variable is to use GetEnvironmentVariableW().
129  SmallVector<wchar_t, MAX_PATH> Buf;
130  size_t Size = MAX_PATH;
131  do {
132    Buf.reserve(Size);
133    SetLastError(NO_ERROR);
134    Size =
135      GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
136    if (Size == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND)
137      return None;
138
139    // Try again with larger buffer.
140  } while (Size > Buf.capacity());
141  Buf.set_size(Size);
142
143  // Convert the result from UTF-16 to UTF-8.
144  SmallVector<char, MAX_PATH> Res;
145  if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
146    return None;
147  return std::string(Res.data());
148}
149
150/// Perform wildcard expansion of Arg, or just push it into Args if it doesn't
151/// have wildcards or doesn't match any files.
152static std::error_code WildcardExpand(StringRef Arg,
153                                      SmallVectorImpl<const char *> &Args,
154                                      StringSaver &Saver) {
155  std::error_code EC;
156
157  // Don't expand Arg if it does not contain any wildcard characters. This is
158  // the common case. Also don't wildcard expand /?. Always treat it as an
159  // option.
160  if (Arg.find_first_of("*?") == StringRef::npos || Arg == "/?" ||
161      Arg == "-?") {
162    Args.push_back(Arg.data());
163    return EC;
164  }
165
166  // Convert back to UTF-16 so we can call FindFirstFileW.
167  SmallVector<wchar_t, MAX_PATH> ArgW;
168  EC = windows::UTF8ToUTF16(Arg, ArgW);
169  if (EC)
170    return EC;
171
172  // Search for matching files.
173  // FIXME:  This assumes the wildcard is only in the file name and not in the
174  // directory portion of the file path.  For example, it doesn't handle
175  // "*\foo.c" nor "s?c\bar.cpp".
176  WIN32_FIND_DATAW FileData;
177  HANDLE FindHandle = FindFirstFileW(ArgW.data(), &FileData);
178  if (FindHandle == INVALID_HANDLE_VALUE) {
179    Args.push_back(Arg.data());
180    return EC;
181  }
182
183  // Extract any directory part of the argument.
184  SmallString<MAX_PATH> Dir = Arg;
185  sys::path::remove_filename(Dir);
186  const int DirSize = Dir.size();
187
188  do {
189    SmallString<MAX_PATH> FileName;
190    EC = windows::UTF16ToUTF8(FileData.cFileName, wcslen(FileData.cFileName),
191                              FileName);
192    if (EC)
193      break;
194
195    // Append FileName to Dir, and remove it afterwards.
196    llvm::sys::path::append(Dir, FileName);
197    Args.push_back(Saver.save(Dir.str()).data());
198    Dir.resize(DirSize);
199  } while (FindNextFileW(FindHandle, &FileData));
200
201  FindClose(FindHandle);
202  return EC;
203}
204
205static std::error_code GetExecutableName(SmallVectorImpl<char> &Filename) {
206  // The first argument may contain just the name of the executable (e.g.,
207  // "clang") rather than the full path, so swap it with the full path.
208  wchar_t ModuleName[MAX_PATH];
209  size_t Length = ::GetModuleFileNameW(NULL, ModuleName, MAX_PATH);
210  if (Length == 0 || Length == MAX_PATH) {
211    return mapWindowsError(GetLastError());
212  }
213
214  // If the first argument is a shortened (8.3) name (which is possible even
215  // if we got the module name), the driver will have trouble distinguishing it
216  // (e.g., clang.exe v. clang++.exe), so expand it now.
217  Length = GetLongPathNameW(ModuleName, ModuleName, MAX_PATH);
218  if (Length == 0)
219    return mapWindowsError(GetLastError());
220  if (Length > MAX_PATH) {
221    // We're not going to try to deal with paths longer than MAX_PATH, so we'll
222    // treat this as an error.  GetLastError() returns ERROR_SUCCESS, which
223    // isn't useful, so we'll hardcode an appropriate error value.
224    return mapWindowsError(ERROR_INSUFFICIENT_BUFFER);
225  }
226
227  std::error_code EC = windows::UTF16ToUTF8(ModuleName, Length, Filename);
228  if (EC)
229    return EC;
230
231  // Make a copy of the filename since assign makes the StringRef invalid.
232  std::string Base = sys::path::filename(Filename.data()).str();
233  Filename.assign(Base.begin(), Base.end());
234  return std::error_code();
235}
236
237std::error_code
238windows::GetCommandLineArguments(SmallVectorImpl<const char *> &Args,
239                                 BumpPtrAllocator &Alloc) {
240  const wchar_t *CmdW = GetCommandLineW();
241  assert(CmdW);
242  std::error_code EC;
243  SmallString<MAX_PATH> Cmd;
244  EC = windows::UTF16ToUTF8(CmdW, wcslen(CmdW), Cmd);
245  if (EC)
246    return EC;
247
248  SmallVector<const char *, 20> TmpArgs;
249  StringSaver Saver(Alloc);
250  cl::TokenizeWindowsCommandLine(Cmd, Saver, TmpArgs, /*MarkEOLs=*/false);
251
252  for (const char *Arg : TmpArgs) {
253    EC = WildcardExpand(Arg, Args, Saver);
254    if (EC)
255      return EC;
256  }
257
258  SmallVector<char, MAX_PATH> Arg0(Args[0], Args[0] + strlen(Args[0]));
259  SmallVector<char, MAX_PATH> Filename;
260  sys::path::remove_filename(Arg0);
261  EC = GetExecutableName(Filename);
262  if (EC)
263    return EC;
264  sys::path::append(Arg0, Filename);
265  Args[0] = Saver.save(Arg0).data();
266  return std::error_code();
267}
268
269std::error_code Process::FixupStandardFileDescriptors() {
270  return std::error_code();
271}
272
273std::error_code Process::SafelyCloseFileDescriptor(int FD) {
274  if (::close(FD) < 0)
275    return std::error_code(errno, std::generic_category());
276  return std::error_code();
277}
278
279bool Process::StandardInIsUserInput() {
280  return FileDescriptorIsDisplayed(0);
281}
282
283bool Process::StandardOutIsDisplayed() {
284  return FileDescriptorIsDisplayed(1);
285}
286
287bool Process::StandardErrIsDisplayed() {
288  return FileDescriptorIsDisplayed(2);
289}
290
291bool Process::FileDescriptorIsDisplayed(int fd) {
292  DWORD Mode;  // Unused
293  return (GetConsoleMode((HANDLE)_get_osfhandle(fd), &Mode) != 0);
294}
295
296unsigned Process::StandardOutColumns() {
297  unsigned Columns = 0;
298  CONSOLE_SCREEN_BUFFER_INFO csbi;
299  if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi))
300    Columns = csbi.dwSize.X;
301  return Columns;
302}
303
304unsigned Process::StandardErrColumns() {
305  unsigned Columns = 0;
306  CONSOLE_SCREEN_BUFFER_INFO csbi;
307  if (GetConsoleScreenBufferInfo(GetStdHandle(STD_ERROR_HANDLE), &csbi))
308    Columns = csbi.dwSize.X;
309  return Columns;
310}
311
312// The terminal always has colors.
313bool Process::FileDescriptorHasColors(int fd) {
314  return FileDescriptorIsDisplayed(fd);
315}
316
317bool Process::StandardOutHasColors() {
318  return FileDescriptorHasColors(1);
319}
320
321bool Process::StandardErrHasColors() {
322  return FileDescriptorHasColors(2);
323}
324
325static bool UseANSI = false;
326void Process::UseANSIEscapeCodes(bool enable) {
327#if defined(ENABLE_VIRTUAL_TERMINAL_PROCESSING)
328  if (enable) {
329    HANDLE Console = GetStdHandle(STD_OUTPUT_HANDLE);
330    DWORD Mode;
331    GetConsoleMode(Console, &Mode);
332    Mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
333    SetConsoleMode(Console, Mode);
334  }
335#endif
336  UseANSI = enable;
337}
338
339namespace {
340class DefaultColors
341{
342  private:
343    WORD defaultColor;
344  public:
345    DefaultColors()
346     :defaultColor(GetCurrentColor()) {}
347    static unsigned GetCurrentColor() {
348      CONSOLE_SCREEN_BUFFER_INFO csbi;
349      if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi))
350        return csbi.wAttributes;
351      return 0;
352    }
353    WORD operator()() const { return defaultColor; }
354};
355
356DefaultColors defaultColors;
357
358WORD fg_color(WORD color) {
359  return color & (FOREGROUND_BLUE | FOREGROUND_GREEN |
360                  FOREGROUND_INTENSITY | FOREGROUND_RED);
361}
362
363WORD bg_color(WORD color) {
364  return color & (BACKGROUND_BLUE | BACKGROUND_GREEN |
365                  BACKGROUND_INTENSITY | BACKGROUND_RED);
366}
367}
368
369bool Process::ColorNeedsFlush() {
370  return !UseANSI;
371}
372
373const char *Process::OutputBold(bool bg) {
374  if (UseANSI) return "\033[1m";
375
376  WORD colors = DefaultColors::GetCurrentColor();
377  if (bg)
378    colors |= BACKGROUND_INTENSITY;
379  else
380    colors |= FOREGROUND_INTENSITY;
381  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), colors);
382  return 0;
383}
384
385const char *Process::OutputColor(char code, bool bold, bool bg) {
386  if (UseANSI) return colorcodes[bg?1:0][bold?1:0][code&7];
387
388  WORD current = DefaultColors::GetCurrentColor();
389  WORD colors;
390  if (bg) {
391    colors = ((code&1) ? BACKGROUND_RED : 0) |
392      ((code&2) ? BACKGROUND_GREEN : 0 ) |
393      ((code&4) ? BACKGROUND_BLUE : 0);
394    if (bold)
395      colors |= BACKGROUND_INTENSITY;
396    colors |= fg_color(current);
397  } else {
398    colors = ((code&1) ? FOREGROUND_RED : 0) |
399      ((code&2) ? FOREGROUND_GREEN : 0 ) |
400      ((code&4) ? FOREGROUND_BLUE : 0);
401    if (bold)
402      colors |= FOREGROUND_INTENSITY;
403    colors |= bg_color(current);
404  }
405  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), colors);
406  return 0;
407}
408
409static WORD GetConsoleTextAttribute(HANDLE hConsoleOutput) {
410  CONSOLE_SCREEN_BUFFER_INFO info;
411  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &info);
412  return info.wAttributes;
413}
414
415const char *Process::OutputReverse() {
416  if (UseANSI) return "\033[7m";
417
418  const WORD attributes
419   = GetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE));
420
421  const WORD foreground_mask = FOREGROUND_BLUE | FOREGROUND_GREEN |
422    FOREGROUND_RED | FOREGROUND_INTENSITY;
423  const WORD background_mask = BACKGROUND_BLUE | BACKGROUND_GREEN |
424    BACKGROUND_RED | BACKGROUND_INTENSITY;
425  const WORD color_mask = foreground_mask | background_mask;
426
427  WORD new_attributes =
428    ((attributes & FOREGROUND_BLUE     )?BACKGROUND_BLUE     :0) |
429    ((attributes & FOREGROUND_GREEN    )?BACKGROUND_GREEN    :0) |
430    ((attributes & FOREGROUND_RED      )?BACKGROUND_RED      :0) |
431    ((attributes & FOREGROUND_INTENSITY)?BACKGROUND_INTENSITY:0) |
432    ((attributes & BACKGROUND_BLUE     )?FOREGROUND_BLUE     :0) |
433    ((attributes & BACKGROUND_GREEN    )?FOREGROUND_GREEN    :0) |
434    ((attributes & BACKGROUND_RED      )?FOREGROUND_RED      :0) |
435    ((attributes & BACKGROUND_INTENSITY)?FOREGROUND_INTENSITY:0) |
436    0;
437  new_attributes = (attributes & ~color_mask) | (new_attributes & color_mask);
438
439  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), new_attributes);
440  return 0;
441}
442
443const char *Process::ResetColor() {
444  if (UseANSI) return "\033[0m";
445  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), defaultColors());
446  return 0;
447}
448
449static unsigned GetRandomNumberSeed() {
450  // Generate a random number seed from the millisecond-resolution Windows
451  // system clock and the current process id.
452  FILETIME Time;
453  GetSystemTimeAsFileTime(&Time);
454  DWORD Pid = GetCurrentProcessId();
455  return hash_combine(Time.dwHighDateTime, Time.dwLowDateTime, Pid);
456}
457
458static unsigned GetPseudoRandomNumber() {
459  // Arrange to call srand once when this function is first used, and
460  // otherwise (if GetRandomNumber always succeeds in using
461  // CryptGenRandom) don't bother at all.
462  static int x = (static_cast<void>(::srand(GetRandomNumberSeed())), 0);
463  (void)x;
464  return ::rand();
465}
466
467unsigned Process::GetRandomNumber() {
468  // Try to use CryptGenRandom.
469  HCRYPTPROV HCPC;
470  if (::CryptAcquireContextW(&HCPC, NULL, NULL, PROV_RSA_FULL,
471                             CRYPT_VERIFYCONTEXT)) {
472    ScopedCryptContext CryptoProvider(HCPC);
473    unsigned Ret;
474    if (::CryptGenRandom(CryptoProvider, sizeof(Ret),
475                         reinterpret_cast<BYTE *>(&Ret)))
476      return Ret;
477  }
478
479  // If that fails, fall back to pseudo-random numbers.
480  return GetPseudoRandomNumber();
481}
482
483typedef NTSTATUS(WINAPI* RtlGetVersionPtr)(PRTL_OSVERSIONINFOW);
484#define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
485
486llvm::VersionTuple llvm::GetWindowsOSVersion() {
487  HMODULE hMod = ::GetModuleHandleW(L"ntdll.dll");
488  if (hMod) {
489    auto getVer = (RtlGetVersionPtr)::GetProcAddress(hMod, "RtlGetVersion");
490    if (getVer) {
491      RTL_OSVERSIONINFOEXW info{};
492      info.dwOSVersionInfoSize = sizeof(info);
493      if (getVer((PRTL_OSVERSIONINFOW)&info) == STATUS_SUCCESS) {
494        return llvm::VersionTuple(info.dwMajorVersion, info.dwMinorVersion, 0,
495                                  info.dwBuildNumber);
496      }
497    }
498  }
499  return llvm::VersionTuple(0, 0, 0, 0);
500}
501
502bool llvm::RunningWindows8OrGreater() {
503  // Windows 8 is version 6.2, service pack 0.
504  return GetWindowsOSVersion() >= llvm::VersionTuple(6, 2, 0, 0);
505}
506
507LLVM_ATTRIBUTE_NORETURN
508void Process::ExitNoCleanup(int RetCode) {
509  TerminateProcess(GetCurrentProcess(), RetCode);
510  llvm_unreachable("TerminateProcess doesn't return");
511}
512