Provide initial implementations of Memory and Process concepts for various

platforms.
Implement GetLLVMSuffix function for the Path concept.

llvm-svn: 16292

1 files changed, 44 insertions, 0 deletions

diff --git a/llvm/lib/System/Win32/Memory.cpp b/llvm/lib/System/Win32/Memory.cpp
new file mode 100644
index 00000000000..8a9ae05f374
--- /dev/null
+++ b/llvm/lib/System/Win32/Memory.cpp
@@ -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);
+}