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//===- 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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