It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Memory.inc b/lib/System/Win32/Memory.inc
new file mode 100644
index 0000000..739d530
--- /dev/null
+++ b/lib/System/Win32/Memory.inc
@@ -0,0 +1,57 @@
+//===- 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,
+ const MemoryBlock *NearBlock,
+ std::string *ErrMsg) {
+ if (NumBytes == 0) return MemoryBlock();
+
+ static const long pageSize = Process::GetPageSize();
+ unsigned NumPages = (NumBytes+pageSize-1)/pageSize;
+
+ //FIXME: support NearBlock if ever needed on Win64.
+
+ void *pa = VirtualAlloc(NULL, NumPages*pageSize, MEM_COMMIT,
+ PAGE_EXECUTE_READWRITE);
+ if (pa == NULL) {
+ MakeErrMsg(ErrMsg, "Can't allocate RWX Memory: ");
+ return MemoryBlock();
+ }
+
+ MemoryBlock result;
+ result.Address = pa;
+ result.Size = NumPages*pageSize;
+ return result;
+}
+
+bool Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) {
+ if (M.Address == 0 || M.Size == 0) return false;
+ if (!VirtualFree(M.Address, 0, MEM_RELEASE))
+ return MakeErrMsg(ErrMsg, "Can't release RWX Memory: ");
+ return false;
+}
+
+}
+