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