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//===- ObjectMemoryBuffer.h - SmallVector-backed MemoryBuffrer -*- C++ -*-===//
//
// 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_OBJECTMEMORYBUFFER_H
#define LLVM_EXECUTIONENGINE_OBJECTMEMORYBUFFER_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
/// \brief SmallVector-backed MemoryBuffer instance.
///
/// This class enables efficient construction of MemoryBuffers from SmallVector
/// instances. This is useful for MCJIT and Orc, where object files are streamed
/// into SmallVectors, then inspected using ObjectFile (which takes a
/// MemoryBuffer).
class ObjectMemoryBuffer : public MemoryBuffer {
public:
/// \brief Construct an ObjectMemoryBuffer from the given SmallVector r-value.
///
/// FIXME: It'd be nice for this to be a non-templated constructor taking a
/// SmallVectorImpl here instead of a templated one taking a SmallVector<N>,
/// but SmallVector's move-construction/assignment currently only take
/// SmallVectors. If/when that is fixed we can simplify this constructor and
/// the following one.
ObjectMemoryBuffer(SmallVectorImpl<char> &&SV)
: SV(std::move(SV)), BufferName("<in-memory object>") {
init(this->SV.begin(), this->SV.end(), false);
}
/// \brief Construct a named ObjectMemoryBuffer from the given SmallVector
/// r-value and StringRef.
ObjectMemoryBuffer(SmallVectorImpl<char> &&SV, StringRef Name)
: SV(std::move(SV)), BufferName(Name) {
init(this->SV.begin(), this->SV.end(), false);
}
const char* getBufferIdentifier() const override { return BufferName.c_str(); }
BufferKind getBufferKind() const override { return MemoryBuffer_Malloc; }
private:
SmallVector<char, 0> SV;
std::string BufferName;
};
} // namespace llvm
#endif
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