1 files changed, 485 insertions, 0 deletions
diff --git a/llvm/lib/Support/Windows/Process.inc b/llvm/lib/Support/Windows/Process.inc
new file mode 100644
index 000000000000..4b91f9f7fc66
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+++ b/llvm/lib/Support/Windows/Process.inc
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+//===- Win32/Process.cpp - Win32 Process Implementation ------- -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Win32 specific implementation of the Process class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ConvertUTF.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/StringSaver.h"
+#include "llvm/Support/WindowsError.h"
+#include <malloc.h>
+
+// The Windows.h header must be after LLVM and standard headers.
+#include "WindowsSupport.h"
+
+#include <direct.h>
+#include <io.h>
+#include <psapi.h>
+#include <shellapi.h>
+
+#if !defined(__MINGW32__)
+ #pragma comment(lib, "psapi.lib")
+ #pragma comment(lib, "shell32.lib")
+#endif
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Win32 specific code
+//===          and must not be UNIX code
+//===----------------------------------------------------------------------===//
+
+#ifdef __MINGW32__
+// This ban should be lifted when MinGW 1.0+ has defined this value.
+#  define _HEAPOK (-2)
+#endif
+
+using namespace llvm;
+
+// This function retrieves the page size using GetNativeSystemInfo() and is
+// present solely so it can be called once to initialize the self_process member
+// below.
+static unsigned computePageSize() {
+  // GetNativeSystemInfo() provides the physical page size which may differ
+  // from GetSystemInfo() in 32-bit applications running under WOW64.
+  SYSTEM_INFO info;
+  GetNativeSystemInfo(&info);
+  // FIXME: FileOffset in MapViewOfFile() should be aligned to not dwPageSize,
+  // but dwAllocationGranularity.
+  return static_cast<unsigned>(info.dwPageSize);
+}
+
+Expected<unsigned> Process::getPageSize() {
+  static unsigned Ret = computePageSize();
+  return Ret;
+}
+
+size_t
+Process::GetMallocUsage()
+{
+  _HEAPINFO hinfo;
+  hinfo._pentry = NULL;
+
+  size_t size = 0;
+
+  while (_heapwalk(&hinfo) == _HEAPOK)
+    size += hinfo._size;
+
+  return size;
+}
+
+void Process::GetTimeUsage(TimePoint<> &elapsed, std::chrono::nanoseconds &user_time,
+                           std::chrono::nanoseconds &sys_time) {
+  elapsed = std::chrono::system_clock::now();;
+
+  FILETIME ProcCreate, ProcExit, KernelTime, UserTime;
+  if (GetProcessTimes(GetCurrentProcess(), &ProcCreate, &ProcExit, &KernelTime,
+                      &UserTime) == 0)
+    return;
+
+  user_time = toDuration(UserTime);
+  sys_time = toDuration(KernelTime);
+}
+
+// Some LLVM programs such as bugpoint produce core files as a normal part of
+// their operation. To prevent the disk from filling up, this configuration
+// item does what's necessary to prevent their generation.
+void Process::PreventCoreFiles() {
+  // Windows does have the concept of core files, called minidumps.  However,
+  // disabling minidumps for a particular application extends past the lifetime
+  // of that application, which is the incorrect behavior for this API.
+  // Additionally, the APIs require elevated privileges to disable and re-
+  // enable minidumps, which makes this untenable. For more information, see
+  // WerAddExcludedApplication and WerRemoveExcludedApplication (Vista and
+  // later).
+  //
+  // Windows also has modal pop-up message boxes.  As this method is used by
+  // bugpoint, preventing these pop-ups is additionally important.
+  SetErrorMode(SEM_FAILCRITICALERRORS |
+               SEM_NOGPFAULTERRORBOX |
+               SEM_NOOPENFILEERRORBOX);
+
+  coreFilesPrevented = true;
+}
+
+/// Returns the environment variable \arg Name's value as a string encoded in
+/// UTF-8. \arg Name is assumed to be in UTF-8 encoding.
+Optional<std::string> Process::GetEnv(StringRef Name) {
+  // Convert the argument to UTF-16 to pass it to _wgetenv().
+  SmallVector<wchar_t, 128> NameUTF16;
+  if (windows::UTF8ToUTF16(Name, NameUTF16))
+    return None;
+
+  // Environment variable can be encoded in non-UTF8 encoding, and there's no
+  // way to know what the encoding is. The only reliable way to look up
+  // multibyte environment variable is to use GetEnvironmentVariableW().
+  SmallVector<wchar_t, MAX_PATH> Buf;
+  size_t Size = MAX_PATH;
+  do {
+    Buf.reserve(Size);
+    SetLastError(NO_ERROR);
+    Size =
+      GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
+    if (Size == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND)
+      return None;
+
+    // Try again with larger buffer.
+  } while (Size > Buf.capacity());
+  Buf.set_size(Size);
+
+  // Convert the result from UTF-16 to UTF-8.
+  SmallVector<char, MAX_PATH> Res;
+  if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
+    return None;
+  return std::string(Res.data());
+}
+
+/// Perform wildcard expansion of Arg, or just push it into Args if it doesn't
+/// have wildcards or doesn't match any files.
+static std::error_code WildcardExpand(StringRef Arg,
+                                      SmallVectorImpl<const char *> &Args,
+                                      StringSaver &Saver) {
+  std::error_code EC;
+
+  // Don't expand Arg if it does not contain any wildcard characters. This is
+  // the common case. Also don't wildcard expand /?. Always treat it as an
+  // option.
+  if (Arg.find_first_of("*?") == StringRef::npos || Arg == "/?" ||
+      Arg == "-?") {
+    Args.push_back(Arg.data());
+    return EC;
+  }
+
+  // Convert back to UTF-16 so we can call FindFirstFileW.
+  SmallVector<wchar_t, MAX_PATH> ArgW;
+  EC = windows::UTF8ToUTF16(Arg, ArgW);
+  if (EC)
+    return EC;
+
+  // Search for matching files.
+  // FIXME:  This assumes the wildcard is only in the file name and not in the
+  // directory portion of the file path.  For example, it doesn't handle
+  // "*\foo.c" nor "s?c\bar.cpp".
+  WIN32_FIND_DATAW FileData;
+  HANDLE FindHandle = FindFirstFileW(ArgW.data(), &FileData);
+  if (FindHandle == INVALID_HANDLE_VALUE) {
+    Args.push_back(Arg.data());
+    return EC;
+  }
+
+  // Extract any directory part of the argument.
+  SmallString<MAX_PATH> Dir = Arg;
+  sys::path::remove_filename(Dir);
+  const int DirSize = Dir.size();
+
+  do {
+    SmallString<MAX_PATH> FileName;
+    EC = windows::UTF16ToUTF8(FileData.cFileName, wcslen(FileData.cFileName),
+                              FileName);
+    if (EC)
+      break;
+
+    // Append FileName to Dir, and remove it afterwards.
+    llvm::sys::path::append(Dir, FileName);
+    Args.push_back(Saver.save(StringRef(Dir)).data());
+    Dir.resize(DirSize);
+  } while (FindNextFileW(FindHandle, &FileData));
+
+  FindClose(FindHandle);
+  return EC;
+}
+
+static std::error_code GetExecutableName(SmallVectorImpl<char> &Filename) {
+  // The first argument may contain just the name of the executable (e.g.,
+  // "clang") rather than the full path, so swap it with the full path.
+  wchar_t ModuleName[MAX_PATH];
+  size_t Length = ::GetModuleFileNameW(NULL, ModuleName, MAX_PATH);
+  if (Length == 0 || Length == MAX_PATH) {
+    return mapWindowsError(GetLastError());
+  }
+
+  // If the first argument is a shortened (8.3) name (which is possible even
+  // if we got the module name), the driver will have trouble distinguishing it
+  // (e.g., clang.exe v. clang++.exe), so expand it now.
+  Length = GetLongPathNameW(ModuleName, ModuleName, MAX_PATH);
+  if (Length == 0)
+    return mapWindowsError(GetLastError());
+  if (Length > MAX_PATH) {
+    // We're not going to try to deal with paths longer than MAX_PATH, so we'll
+    // treat this as an error.  GetLastError() returns ERROR_SUCCESS, which
+    // isn't useful, so we'll hardcode an appropriate error value.
+    return mapWindowsError(ERROR_INSUFFICIENT_BUFFER);
+  }
+
+  std::error_code EC = windows::UTF16ToUTF8(ModuleName, Length, Filename);
+  if (EC)
+    return EC;
+
+  StringRef Base = sys::path::filename(Filename.data());
+  Filename.assign(Base.begin(), Base.end());
+  return std::error_code();
+}
+
+std::error_code
+windows::GetCommandLineArguments(SmallVectorImpl<const char *> &Args,
+                                 BumpPtrAllocator &Alloc) {
+  const wchar_t *CmdW = GetCommandLineW();
+  assert(CmdW);
+  std::error_code EC;
+  SmallString<MAX_PATH> Cmd;
+  EC = windows::UTF16ToUTF8(CmdW, wcslen(CmdW), Cmd);
+  if (EC)
+    return EC;
+
+  SmallVector<const char *, 20> TmpArgs;
+  StringSaver Saver(Alloc);
+  cl::TokenizeWindowsCommandLine(Cmd, Saver, TmpArgs, /*MarkEOLs=*/false);
+
+  for (const char *Arg : TmpArgs) {
+    EC = WildcardExpand(Arg, Args, Saver);
+    if (EC)
+      return EC;
+  }
+
+  SmallVector<char, MAX_PATH> Arg0(Args[0], Args[0] + strlen(Args[0]));
+  SmallVector<char, MAX_PATH> Filename;
+  sys::path::remove_filename(Arg0);
+  EC = GetExecutableName(Filename);
+  if (EC)
+    return EC;
+  sys::path::append(Arg0, Filename);
+  Args[0] = Saver.save(Arg0).data();
+  return std::error_code();
+}
+
+std::error_code Process::FixupStandardFileDescriptors() {
+  return std::error_code();
+}
+
+std::error_code Process::SafelyCloseFileDescriptor(int FD) {
+  if (::close(FD) < 0)
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+}
+
+bool Process::StandardInIsUserInput() {
+  return FileDescriptorIsDisplayed(0);
+}
+
+bool Process::StandardOutIsDisplayed() {
+  return FileDescriptorIsDisplayed(1);
+}
+
+bool Process::StandardErrIsDisplayed() {
+  return FileDescriptorIsDisplayed(2);
+}
+
+bool Process::FileDescriptorIsDisplayed(int fd) {
+  DWORD Mode;  // Unused
+  return (GetConsoleMode((HANDLE)_get_osfhandle(fd), &Mode) != 0);
+}
+
+unsigned Process::StandardOutColumns() {
+  unsigned Columns = 0;
+  CONSOLE_SCREEN_BUFFER_INFO csbi;
+  if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi))
+    Columns = csbi.dwSize.X;
+  return Columns;
+}
+
+unsigned Process::StandardErrColumns() {
+  unsigned Columns = 0;
+  CONSOLE_SCREEN_BUFFER_INFO csbi;
+  if (GetConsoleScreenBufferInfo(GetStdHandle(STD_ERROR_HANDLE), &csbi))
+    Columns = csbi.dwSize.X;
+  return Columns;
+}
+
+// The terminal always has colors.
+bool Process::FileDescriptorHasColors(int fd) {
+  return FileDescriptorIsDisplayed(fd);
+}
+
+bool Process::StandardOutHasColors() {
+  return FileDescriptorHasColors(1);
+}
+
+bool Process::StandardErrHasColors() {
+  return FileDescriptorHasColors(2);
+}
+
+static bool UseANSI = false;
+void Process::UseANSIEscapeCodes(bool enable) {
+#if defined(ENABLE_VIRTUAL_TERMINAL_PROCESSING)
+  if (enable) {
+    HANDLE Console = GetStdHandle(STD_OUTPUT_HANDLE);
+    DWORD Mode;
+    GetConsoleMode(Console, &Mode);
+    Mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    SetConsoleMode(Console, Mode);
+  }
+#endif
+  UseANSI = enable;
+}
+
+namespace {
+class DefaultColors
+{
+  private:
+    WORD defaultColor;
+  public:
+    DefaultColors()
+     :defaultColor(GetCurrentColor()) {}
+    static unsigned GetCurrentColor() {
+      CONSOLE_SCREEN_BUFFER_INFO csbi;
+      if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi))
+        return csbi.wAttributes;
+      return 0;
+    }
+    WORD operator()() const { return defaultColor; }
+};
+
+DefaultColors defaultColors;
+
+WORD fg_color(WORD color) {
+  return color & (FOREGROUND_BLUE | FOREGROUND_GREEN |
+                  FOREGROUND_INTENSITY | FOREGROUND_RED);
+}
+
+WORD bg_color(WORD color) {
+  return color & (BACKGROUND_BLUE | BACKGROUND_GREEN |
+                  BACKGROUND_INTENSITY | BACKGROUND_RED);
+}
+}
+
+bool Process::ColorNeedsFlush() {
+  return !UseANSI;
+}
+
+const char *Process::OutputBold(bool bg) {
+  if (UseANSI) return "\033[1m";
+
+  WORD colors = DefaultColors::GetCurrentColor();
+  if (bg)
+    colors |= BACKGROUND_INTENSITY;
+  else
+    colors |= FOREGROUND_INTENSITY;
+  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), colors);
+  return 0;
+}
+
+const char *Process::OutputColor(char code, bool bold, bool bg) {
+  if (UseANSI) return colorcodes[bg?1:0][bold?1:0][code&7];
+
+  WORD current = DefaultColors::GetCurrentColor();
+  WORD colors;
+  if (bg) {
+    colors = ((code&1) ? BACKGROUND_RED : 0) |
+      ((code&2) ? BACKGROUND_GREEN : 0 ) |
+      ((code&4) ? BACKGROUND_BLUE : 0);
+    if (bold)
+      colors |= BACKGROUND_INTENSITY;
+    colors |= fg_color(current);
+  } else {
+    colors = ((code&1) ? FOREGROUND_RED : 0) |
+      ((code&2) ? FOREGROUND_GREEN : 0 ) |
+      ((code&4) ? FOREGROUND_BLUE : 0);
+    if (bold)
+      colors |= FOREGROUND_INTENSITY;
+    colors |= bg_color(current);
+  }
+  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), colors);
+  return 0;
+}
+
+static WORD GetConsoleTextAttribute(HANDLE hConsoleOutput) {
+  CONSOLE_SCREEN_BUFFER_INFO info;
+  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &info);
+  return info.wAttributes;
+}
+
+const char *Process::OutputReverse() {
+  if (UseANSI) return "\033[7m";
+
+  const WORD attributes
+   = GetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE));
+
+  const WORD foreground_mask = FOREGROUND_BLUE | FOREGROUND_GREEN |
+    FOREGROUND_RED | FOREGROUND_INTENSITY;
+  const WORD background_mask = BACKGROUND_BLUE | BACKGROUND_GREEN |
+    BACKGROUND_RED | BACKGROUND_INTENSITY;
+  const WORD color_mask = foreground_mask | background_mask;
+
+  WORD new_attributes =
+    ((attributes & FOREGROUND_BLUE     )?BACKGROUND_BLUE     :0) |
+    ((attributes & FOREGROUND_GREEN    )?BACKGROUND_GREEN    :0) |
+    ((attributes & FOREGROUND_RED      )?BACKGROUND_RED      :0) |
+    ((attributes & FOREGROUND_INTENSITY)?BACKGROUND_INTENSITY:0) |
+    ((attributes & BACKGROUND_BLUE     )?FOREGROUND_BLUE     :0) |
+    ((attributes & BACKGROUND_GREEN    )?FOREGROUND_GREEN    :0) |
+    ((attributes & BACKGROUND_RED      )?FOREGROUND_RED      :0) |
+    ((attributes & BACKGROUND_INTENSITY)?FOREGROUND_INTENSITY:0) |
+    0;
+  new_attributes = (attributes & ~color_mask) | (new_attributes & color_mask);
+
+  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), new_attributes);
+  return 0;
+}
+
+const char *Process::ResetColor() {
+  if (UseANSI) return "\033[0m";
+  SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), defaultColors());
+  return 0;
+}
+
+// Include GetLastError() in a fatal error message.
+static void ReportLastErrorFatal(const char *Msg) {
+  std::string ErrMsg;
+  MakeErrMsg(&ErrMsg, Msg);
+  report_fatal_error(ErrMsg);
+}
+
+unsigned Process::GetRandomNumber() {
+  HCRYPTPROV HCPC;
+  if (!::CryptAcquireContextW(&HCPC, NULL, NULL, PROV_RSA_FULL,
+                              CRYPT_VERIFYCONTEXT))
+    ReportLastErrorFatal("Could not acquire a cryptographic context");
+
+  ScopedCryptContext CryptoProvider(HCPC);
+  unsigned Ret;
+  if (!::CryptGenRandom(CryptoProvider, sizeof(Ret),
+                        reinterpret_cast<BYTE *>(&Ret)))
+    ReportLastErrorFatal("Could not generate a random number");
+  return Ret;
+}
+
+typedef NTSTATUS(WINAPI* RtlGetVersionPtr)(PRTL_OSVERSIONINFOW);
+#define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
+
+llvm::VersionTuple llvm::GetWindowsOSVersion() {
+  HMODULE hMod = ::GetModuleHandleW(L"ntdll.dll");
+  if (hMod) {
+    auto getVer = (RtlGetVersionPtr)::GetProcAddress(hMod, "RtlGetVersion");
+    if (getVer) {
+      RTL_OSVERSIONINFOEXW info{};
+      info.dwOSVersionInfoSize = sizeof(info);
+      if (getVer((PRTL_OSVERSIONINFOW)&info) == STATUS_SUCCESS) {
+        return llvm::VersionTuple(info.dwMajorVersion, info.dwMinorVersion, 0,
+                                  info.dwBuildNumber);
+      }
+    }
+  }
+  return llvm::VersionTuple(0, 0, 0, 0);
+}
+
+bool llvm::RunningWindows8OrGreater() {
+  // Windows 8 is version 6.2, service pack 0.
+  return GetWindowsOSVersion() >= llvm::VersionTuple(6, 2, 0, 0);
+}