mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-07 01:54:50 +00:00
45 lines
1.5 KiB
PHP
45 lines
1.5 KiB
PHP
|
//===- 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);
|
||
|
}
|