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f4ccd11075
This compiles with no changes to clang/lld/lldb with MSVC and includes overloads to various functions which are used by those projects and llvm which have OwningPtr's as parameters. This should allow out of tree projects some time to move. There are also no changes to libs/Target, which should help out of tree targets have time to move, if necessary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203083 91177308-0d34-0410-b5e6-96231b3b80d8
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//===---- ObjectBuffer.h - Utility class to wrap object image memory -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares a wrapper class to hold the memory into which an
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// object will be generated.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_OBJECTBUFFER_H
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#define LLVM_EXECUTIONENGINE_OBJECTBUFFER_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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/// ObjectBuffer - This class acts as a container for the memory buffer used during
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/// generation and loading of executable objects using MCJIT and RuntimeDyld. The
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/// underlying memory for the object will be owned by the ObjectBuffer instance
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/// throughout its lifetime. The getMemBuffer() method provides a way to create a
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/// MemoryBuffer wrapper object instance to be owned by other classes (such as
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/// ObjectFile) as needed, but the MemoryBuffer instance returned does not own the
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/// actual memory it points to.
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class ObjectBuffer {
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virtual void anchor();
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public:
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ObjectBuffer() {}
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ObjectBuffer(MemoryBuffer* Buf) : Buffer(Buf) {}
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virtual ~ObjectBuffer() {}
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/// getMemBuffer - Like MemoryBuffer::getMemBuffer() this function
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/// returns a pointer to an object that is owned by the caller. However,
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/// the caller does not take ownership of the underlying memory.
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MemoryBuffer *getMemBuffer() const {
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return MemoryBuffer::getMemBuffer(Buffer->getBuffer(), "", false);
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}
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const char *getBufferStart() const { return Buffer->getBufferStart(); }
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size_t getBufferSize() const { return Buffer->getBufferSize(); }
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StringRef getBuffer() const { return Buffer->getBuffer(); }
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protected:
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// The memory contained in an ObjectBuffer
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std::unique_ptr<MemoryBuffer> Buffer;
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};
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/// ObjectBufferStream - This class encapsulates the SmallVector and
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/// raw_svector_ostream needed to generate an object using MC code emission
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/// while providing a common ObjectBuffer interface for access to the
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/// memory once the object has been generated.
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class ObjectBufferStream : public ObjectBuffer {
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virtual void anchor();
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public:
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ObjectBufferStream() : OS(SV) {}
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virtual ~ObjectBufferStream() {}
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raw_ostream &getOStream() { return OS; }
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void flush()
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{
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OS.flush();
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// Make the data accessible via the ObjectBuffer::Buffer
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Buffer.reset(MemoryBuffer::getMemBuffer(StringRef(SV.data(), SV.size()),
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"",
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false));
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}
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protected:
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SmallVector<char, 4096> SV; // Working buffer into which we JIT.
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raw_svector_ostream OS; // streaming wrapper
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};
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} // namespace llvm
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#endif
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