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82 lines
2.8 KiB
C++
82 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/OwningPtr.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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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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OwningPtr<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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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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