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//===---- ObjectBuffer.h - Utility class to wrap object image memory -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares a wrapper class to hold the memory into which an
// object will be generated.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_OBJECTBUFFER_H
#define LLVM_EXECUTIONENGINE_OBJECTBUFFER_H
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
/// ObjectBuffer - This class acts as a container for the memory buffer used during
/// generation and loading of executable objects using MCJIT and RuntimeDyld. The
/// underlying memory for the object will be owned by the ObjectBuffer instance
/// throughout its lifetime. The getMemBuffer() method provides a way to create a
/// MemoryBuffer wrapper object instance to be owned by other classes (such as
/// ObjectFile) as needed, but the MemoryBuffer instance returned does not own the
/// actual memory it points to.
class ObjectBuffer {
public:
ObjectBuffer() {}
ObjectBuffer(MemoryBuffer* Buf) : Buffer(Buf) {}
virtual ~ObjectBuffer() {}
/// getMemBuffer - Like MemoryBuffer::getMemBuffer() this function
/// returns a pointer to an object that is owned by the caller. However,
/// the caller does not take ownership of the underlying memory.
MemoryBuffer *getMemBuffer() const {
return MemoryBuffer::getMemBuffer(Buffer->getBuffer(), "", false);
}
const char *getBufferStart() const { return Buffer->getBufferStart(); }
size_t getBufferSize() const { return Buffer->getBufferSize(); }
StringRef getBuffer() const { return Buffer->getBuffer(); }
protected:
// The memory contained in an ObjectBuffer
OwningPtr<MemoryBuffer> Buffer;
};
/// ObjectBufferStream - This class encapsulates the SmallVector and
/// raw_svector_ostream needed to generate an object using MC code emission
/// while providing a common ObjectBuffer interface for access to the
/// memory once the object has been generated.
class ObjectBufferStream : public ObjectBuffer {
public:
ObjectBufferStream() : OS(SV) {}
virtual ~ObjectBufferStream() {}
raw_ostream &getOStream() { return OS; }
void flush()
{
OS.flush();
// Make the data accessible via the ObjectBuffer::Buffer
Buffer.reset(MemoryBuffer::getMemBuffer(StringRef(SV.data(), SV.size()),
"",
false));
}
protected:
SmallVector<char, 4096> SV; // Working buffer into which we JIT.
raw_svector_ostream OS; // streaming wrapper
};
} // namespace llvm
#endif
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