1 files changed, 53 insertions, 0 deletions
diff --git a/llvm/lib/System/Win32/Memory.inc b/llvm/lib/System/Win32/Memory.inc
new file mode 100644
index 00000000000..f7b05abe037
--- /dev/null
+++ b/llvm/lib/System/Win32/Memory.inc
@@ -0,0 +1,53 @@
+//===- Win32/Memory.cpp - Win32 Memory Implementation -----------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Jeff Cohen and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Win32 specific implementation of various Memory
+// management utilities
+//
+//===----------------------------------------------------------------------===//
+
+#include "Win32.h"
+#include "llvm/System/Process.h"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Win32 specific code 
+//===          and must not be UNIX code
+//===----------------------------------------------------------------------===//
+
+MemoryBlock Memory::AllocateRWX(unsigned NumBytes) {
+  if (NumBytes == 0) return MemoryBlock();
+
+  static const long pageSize = Process::GetPageSize();
+  unsigned NumPages = (NumBytes+pageSize-1)/pageSize;
+
+  void *pa = VirtualAlloc(NULL, NumPages*pageSize, MEM_COMMIT,
+                  PAGE_EXECUTE_READWRITE);
+  if (pa == NULL) {
+    ThrowError("Can't allocate RWX Memory: ");
+  }
+
+  MemoryBlock result;
+  result.Address = pa;
+  result.Size = NumPages*pageSize;
+  return result;
+}
+
+void Memory::ReleaseRWX(MemoryBlock& M) {
+  if (M.Address == 0 || M.Size == 0) return;
+  if (!VirtualFree(M.Address, 0, MEM_RELEASE)) {
+    ThrowError("Can't release RWX Memory: ");
+  }
+}
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab