//===- 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) { GetError("Can't allocate RWX Memory: ", ErrMsg); 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 GetError("Can't release RWX Memory: ", ErrMsg); return false; } }