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cbad701d0b
platforms. Implement GetLLVMSuffix function for the Path concept. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16292 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
//===- Win32/Memory.cpp - Win32 Memory Implementation -----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the Win32 specific implementation of various Memory
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// management utilities
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//
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//===----------------------------------------------------------------------===//
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#include <llvm/System/Process.h>
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#include "windows.h"
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namespace llvm {
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using namespace sys;
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only Win32 specific code.
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//===----------------------------------------------------------------------===//
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void* Memory::AllocateRWX(Memory&M, unsigned NumBytes) {
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if (NumBytes == 0) return 0;
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unsigned pageSize = Process::GetPageSize();
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unsigned NumPages = (NumBytes+pageSize-1)/pageSize;
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void *P = VirtualAlloc(0, NumPages*pageSize, MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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if (P == 0) {
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throw std::string("Couldn't allocate ") + utostr(NumBytes) +
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" bytes of executable memory!";
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}
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M.Address = P;
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M.AllocSize = NumBytes;
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return P;
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}
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void Memory::ReleaseRWX(Memory& M) {
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if (M.Address == 0 ) return;
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VirtualFree(M.Address, M.AllocSize, MEM_DECOMMIT, PAGE_NOACCESS);
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}
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