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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/SmallVector.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
/// 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.
class ObjectBuffer {
virtual void anchor();
public:
ObjectBuffer() {}
ObjectBuffer(std::unique_ptr<MemoryBuffer> Buf) : Buffer(std::move(Buf)) {}
virtual ~ObjectBuffer() {}
MemoryBufferRef getMemBuffer() const { return Buffer->getMemBufferRef(); }
const char *getBufferStart() const { return Buffer->getBufferStart(); }
size_t getBufferSize() const { return Buffer->getBufferSize(); }
StringRef getBuffer() const { return Buffer->getBuffer(); }
StringRef getBufferIdentifier() const {
return Buffer->getBufferIdentifier();
}
protected:
// The memory contained in an ObjectBuffer
std::unique_ptr<MemoryBuffer> Buffer;
};
/// 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 {
void anchor() override;
public:
ObjectBufferStream() : OS(SV) {}
virtual ~ObjectBufferStream() {}
raw_ostream &getOStream() { return OS; }
void flush()
{
OS.flush();
// Make the data accessible via the ObjectBuffer::Buffer
Buffer =
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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