1 files changed, 249 insertions, 0 deletions
diff --git a/llvm/include/llvm/Support/Windows/WindowsSupport.h b/llvm/include/llvm/Support/Windows/WindowsSupport.h
new file mode 100644
index 0000000000000..bd5a90c2c3f00
--- /dev/null
+++ b/llvm/include/llvm/Support/Windows/WindowsSupport.h
@@ -0,0 +1,249 @@
+//===- WindowsSupport.h - Common Windows Include File -----------*- 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 defines things specific to Windows implementations.  In addition to
+// providing some helpers for working with win32 APIs, this header wraps
+// <windows.h> with some portability macros.  Always include WindowsSupport.h
+// instead of including <windows.h> directly.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic Win32 code that
+//===          is guaranteed to work on *all* Win32 variants.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_WINDOWSSUPPORT_H
+#define LLVM_SUPPORT_WINDOWSSUPPORT_H
+
+// mingw-w64 tends to define it as 0x0502 in its headers.
+#undef _WIN32_WINNT
+#undef _WIN32_IE
+
+// Require at least Windows 7 API.
+#define _WIN32_WINNT 0x0601
+#define _WIN32_IE    0x0800 // MinGW at it again. FIXME: verify if still needed.
+#define WIN32_LEAN_AND_MEAN
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Config/config.h" // Get build system configuration settings
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/Chrono.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/VersionTuple.h"
+#include <cassert>
+#include <string>
+#include <system_error>
+#include <windows.h>
+
+// Must be included after windows.h
+#include <wincrypt.h>
+
+namespace llvm {
+
+/// Determines if the program is running on Windows 8 or newer. This
+/// reimplements one of the helpers in the Windows 8.1 SDK, which are intended
+/// to supercede raw calls to GetVersionEx. Old SDKs, Cygwin, and MinGW don't
+/// yet have VersionHelpers.h, so we have our own helper.
+bool RunningWindows8OrGreater();
+
+/// Returns the Windows version as Major.Minor.0.BuildNumber. Uses
+/// RtlGetVersion or GetVersionEx under the hood depending on what is available.
+/// GetVersionEx is deprecated, but this API exposes the build number which can
+/// be useful for working around certain kernel bugs.
+llvm::VersionTuple GetWindowsOSVersion();
+
+bool MakeErrMsg(std::string *ErrMsg, const std::string &prefix);
+
+// Include GetLastError() in a fatal error message.
+LLVM_ATTRIBUTE_NORETURN inline void ReportLastErrorFatal(const char *Msg) {
+  std::string ErrMsg;
+  MakeErrMsg(&ErrMsg, Msg);
+  llvm::report_fatal_error(ErrMsg);
+}
+
+template <typename HandleTraits>
+class ScopedHandle {
+  typedef typename HandleTraits::handle_type handle_type;
+  handle_type Handle;
+
+  ScopedHandle(const ScopedHandle &other) = delete;
+  void operator=(const ScopedHandle &other) = delete;
+public:
+  ScopedHandle()
+    : Handle(HandleTraits::GetInvalid()) {}
+
+  explicit ScopedHandle(handle_type h)
+    : Handle(h) {}
+
+  ~ScopedHandle() {
+    if (HandleTraits::IsValid(Handle))
+      HandleTraits::Close(Handle);
+  }
+
+  handle_type take() {
+    handle_type t = Handle;
+    Handle = HandleTraits::GetInvalid();
+    return t;
+  }
+
+  ScopedHandle &operator=(handle_type h) {
+    if (HandleTraits::IsValid(Handle))
+      HandleTraits::Close(Handle);
+    Handle = h;
+    return *this;
+  }
+
+  // True if Handle is valid.
+  explicit operator bool() const {
+    return HandleTraits::IsValid(Handle) ? true : false;
+  }
+
+  operator handle_type() const {
+    return Handle;
+  }
+};
+
+struct CommonHandleTraits {
+  typedef HANDLE handle_type;
+
+  static handle_type GetInvalid() {
+    return INVALID_HANDLE_VALUE;
+  }
+
+  static void Close(handle_type h) {
+    ::CloseHandle(h);
+  }
+
+  static bool IsValid(handle_type h) {
+    return h != GetInvalid();
+  }
+};
+
+struct JobHandleTraits : CommonHandleTraits {
+  static handle_type GetInvalid() {
+    return NULL;
+  }
+};
+
+struct CryptContextTraits : CommonHandleTraits {
+  typedef HCRYPTPROV handle_type;
+
+  static handle_type GetInvalid() {
+    return 0;
+  }
+
+  static void Close(handle_type h) {
+    ::CryptReleaseContext(h, 0);
+  }
+
+  static bool IsValid(handle_type h) {
+    return h != GetInvalid();
+  }
+};
+
+struct RegTraits : CommonHandleTraits {
+  typedef HKEY handle_type;
+
+  static handle_type GetInvalid() {
+    return NULL;
+  }
+
+  static void Close(handle_type h) {
+    ::RegCloseKey(h);
+  }
+
+  static bool IsValid(handle_type h) {
+    return h != GetInvalid();
+  }
+};
+
+struct FindHandleTraits : CommonHandleTraits {
+  static void Close(handle_type h) {
+    ::FindClose(h);
+  }
+};
+
+struct FileHandleTraits : CommonHandleTraits {};
+
+typedef ScopedHandle<CommonHandleTraits> ScopedCommonHandle;
+typedef ScopedHandle<FileHandleTraits>   ScopedFileHandle;
+typedef ScopedHandle<CryptContextTraits> ScopedCryptContext;
+typedef ScopedHandle<RegTraits>          ScopedRegHandle;
+typedef ScopedHandle<FindHandleTraits>   ScopedFindHandle;
+typedef ScopedHandle<JobHandleTraits>    ScopedJobHandle;
+
+template <class T>
+class SmallVectorImpl;
+
+template <class T>
+typename SmallVectorImpl<T>::const_pointer
+c_str(SmallVectorImpl<T> &str) {
+  str.push_back(0);
+  str.pop_back();
+  return str.data();
+}
+
+namespace sys {
+
+inline std::chrono::nanoseconds toDuration(FILETIME Time) {
+  ULARGE_INTEGER TimeInteger;
+  TimeInteger.LowPart = Time.dwLowDateTime;
+  TimeInteger.HighPart = Time.dwHighDateTime;
+
+  // FILETIME's are # of 100 nanosecond ticks (1/10th of a microsecond)
+  return std::chrono::nanoseconds(100 * TimeInteger.QuadPart);
+}
+
+inline TimePoint<> toTimePoint(FILETIME Time) {
+  ULARGE_INTEGER TimeInteger;
+  TimeInteger.LowPart = Time.dwLowDateTime;
+  TimeInteger.HighPart = Time.dwHighDateTime;
+
+  // Adjust for different epoch
+  TimeInteger.QuadPart -= 11644473600ll * 10000000;
+
+  // FILETIME's are # of 100 nanosecond ticks (1/10th of a microsecond)
+  return TimePoint<>(std::chrono::nanoseconds(100 * TimeInteger.QuadPart));
+}
+
+inline FILETIME toFILETIME(TimePoint<> TP) {
+  ULARGE_INTEGER TimeInteger;
+  TimeInteger.QuadPart = TP.time_since_epoch().count() / 100;
+  TimeInteger.QuadPart += 11644473600ll * 10000000;
+
+  FILETIME Time;
+  Time.dwLowDateTime = TimeInteger.LowPart;
+  Time.dwHighDateTime = TimeInteger.HighPart;
+  return Time;
+}
+
+namespace windows {
+// Returns command line arguments. Unlike arguments given to main(),
+// this function guarantees that the returned arguments are encoded in
+// UTF-8 regardless of the current code page setting.
+std::error_code GetCommandLineArguments(SmallVectorImpl<const char *> &Args,
+                                        BumpPtrAllocator &Alloc);
+
+/// Convert UTF-8 path to a suitable UTF-16 path for use with the Win32 Unicode
+/// File API.
+std::error_code widenPath(const Twine &Path8, SmallVectorImpl<wchar_t> &Path16,
+                          size_t MaxPathLen = MAX_PATH);
+
+} // end namespace windows
+} // end namespace sys
+} // end namespace llvm.
+
+#endif