From cbad701d0b6fd42112e121e2d7af9c70aaee7440 Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Sat, 11 Sep 2004 04:59:30 +0000
Subject: Provide initial implementations of Memory and Process concepts for
 various platforms. Implement GetLLVMSuffix function for the Path concept.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16292 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/System/Win32/Memory.inc | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 lib/System/Win32/Memory.inc

(limited to 'lib/System/Win32/Memory.inc')

diff --git a/lib/System/Win32/Memory.inc b/lib/System/Win32/Memory.inc
new file mode 100644
index 0000000..8a9ae05
--- /dev/null
+++ b/lib/System/Win32/Memory.inc
@@ -0,0 +1,44 @@
+//===- Win32/Memory.cpp - Win32 Memory Implementation -----------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer 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 <llvm/System/Process.h>
+#include "windows.h"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Win32 specific code.
+//===----------------------------------------------------------------------===//
+
+void* Memory::AllocateRWX(Memory&M, unsigned NumBytes) {
+  if (NumBytes == 0) return 0;
+
+  unsigned pageSize = Process::GetPageSize();
+  unsigned NumPages = (NumBytes+pageSize-1)/pageSize;
+  void *P = VirtualAlloc(0, NumPages*pageSize, MEM_COMMIT, 
+                         PAGE_EXECUTE_READWRITE);
+  if (P == 0) {
+    throw std::string("Couldn't allocate ") + utostr(NumBytes) + 
+        " bytes of executable memory!";
+  }
+  M.Address = P;
+  M.AllocSize = NumBytes;
+  return P;
+}
+
+void Memory::ReleaseRWX(Memory& M) {
+  if (M.Address == 0 ) return;
+  VirtualFree(M.Address, M.AllocSize, MEM_DECOMMIT, PAGE_NOACCESS);
+}
-- 
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