text: //===- 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);
    }
  
    StringRef getBufferIdentifier() const override { return BufferName; }
  
    BufferKind getBufferKind() const override { return MemoryBuffer_Malloc; }
  
  private:
    SmallVector<char, 0> SV;
    std::string BufferName;
  };
  
  } // namespace llvm
  
  #endif
  