Avoid the deprecated GetVersionEx API

[oota-llvm.git] / lib / Support / Windows / WindowsSupport.h

diff --git a/lib/Support/Windows/WindowsSupport.h b/lib/Support/Windows/WindowsSupport.h
index ca36812b78b4296191569a15555d77e6bd269ff1..60490f2664345baf03504449ec997beee78df3c6 100644 (file)
--- a/lib/Support/Windows/WindowsSupport.h
+++ b/lib/Support/Windows/WindowsSupport.h
@@ -19,17 +19,25 @@
 //===          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 XP(5.1) API.
-#define _WIN32_WINNT 0x0501
-#define _WIN32_IE    0x0600 // MinGW at it again.
+// 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/Compiler.h"
 #include <system_error>
@@ -39,17 +47,42 @@
 #include <string>
 #include <vector>
 
+/// 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.
+inline bool RunningWindows8OrGreater() {
+  // Windows 8 is version 6.2, service pack 0.
+  OSVERSIONINFOEXW osvi = {};
+  osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+  osvi.dwMajorVersion = 6;
+  osvi.dwMinorVersion = 2;
+  osvi.wServicePackMajor = 0;
+
+  DWORDLONG Mask = 0;
+  Mask = VerSetConditionMask(Mask, VER_MAJORVERSION, VER_GREATER_EQUAL);
+  Mask = VerSetConditionMask(Mask, VER_MINORVERSION, VER_GREATER_EQUAL);
+  Mask = VerSetConditionMask(Mask, VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
+
+  return VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION |
+                                       VER_SERVICEPACKMAJOR,
+                            Mask) != FALSE;
+}
+
 inline bool MakeErrMsg(std::string* ErrMsg, const std::string& prefix) {
   if (!ErrMsg)
     return true;
   char *buffer = NULL;
+  DWORD LastError = GetLastError();
   DWORD R = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
-                          FORMAT_MESSAGE_FROM_SYSTEM,
-                          NULL, GetLastError(), 0, (LPSTR)&buffer, 1, NULL);
+                          FORMAT_MESSAGE_FROM_SYSTEM |
+                          FORMAT_MESSAGE_MAX_WIDTH_MASK,
+                          NULL, LastError, 0, (LPSTR)&buffer, 1, NULL);
   if (R)
-    *ErrMsg = prefix + buffer;
+    *ErrMsg = prefix + ": " + buffer;
   else
-    *ErrMsg = prefix + "Unknown error";
+    *ErrMsg = prefix + ": Unknown error";
+  *ErrMsg += " (0x" + llvm::utohexstr(LastError) + ")";
 
   LocalFree(buffer);
   return R != 0;
@@ -88,7 +121,7 @@ public:
   }
 
   // True if Handle is valid.
-  LLVM_EXPLICIT operator bool() const {
+  explicit operator bool() const {
     return HandleTraits::IsValid(Handle) ? true : false;
   }
 
@@ -162,11 +195,20 @@ c_str(SmallVectorImpl<T> &str) {
 }
 
 namespace sys {
+namespace path {
+std::error_code widenPath(const Twine &Path8,
+                          SmallVectorImpl<wchar_t> &Path16);
+} // end namespace path
+
 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);
+std::error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16);
+std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
+                            SmallVectorImpl<char> &utf8);
+/// Convert from UTF16 to the current code page used in the system
+std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
+                             SmallVectorImpl<char> &utf8);
 } // end namespace windows
 } // end namespace sys
 } // end namespace llvm.
+
+#endif