+//===- WindowsSupport.h - Common Windows Include File -----------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//===----------------------------------------------------------------------===//
+
+// mingw-w64 tends to define it as 0x0502 in its headers.
+#undef _WIN32_WINNT
+#undef _WIN32_IE
+
+// Require at least Windows XP(5.1) API.
+#define _WIN32_WINNT 0x0501
+#define _WIN32_IE 0x0600 // MinGW at it again.
+#define WIN32_LEAN_AND_MEAN
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h" // Get build system configuration settings
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/system_error.h"
+#include <windows.h>
+#include <wincrypt.h>
+#include <cassert>
+#include <string>
+#include <vector>
+
+inline bool MakeErrMsg(std::string* ErrMsg, const std::string& prefix) {
+ if (!ErrMsg)
+ return true;
+ char *buffer = NULL;
+ DWORD R = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+ FORMAT_MESSAGE_FROM_SYSTEM,
+ NULL, GetLastError(), 0, (LPSTR)&buffer, 1, NULL);
+ if (R)
+ *ErrMsg = prefix + buffer;
+ else
+ *ErrMsg = prefix + "Unknown error";
+
+ LocalFree(buffer);
+ return R != 0;
+}
+
+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.
+ LLVM_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 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<FindHandleTraits> ScopedFindHandle;
+typedef ScopedHandle<JobHandleTraits> ScopedJobHandle;
+
+namespace llvm {
+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 {
+namespace windows {
+error_code UTF8ToUTF16(StringRef utf8,
+ SmallVectorImpl<wchar_t> &utf16);
+error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
+ SmallVectorImpl<char> &utf8);
+} // end namespace windows
+} // end namespace sys
+} // end namespace llvm.
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