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548f2b6e8f
Owning the buffer is somewhat inflexible. Some Binaries have sub Binaries (like Archive) and we had to create dummy buffers just to handle that. It is also a bad fit for IRObjectFile where the Module wants to own the buffer too. Keeping this ownership would make supporting IR inside native objects particularly painful. This patch focuses in lib/Object. If something elsewhere used to own an Binary, now it also owns a MemoryBuffer. This patch introduces a few new types. * MemoryBufferRef. This is just a pair of StringRefs for the data and name. This is to MemoryBuffer as StringRef is to std::string. * OwningBinary. A combination of Binary and a MemoryBuffer. This is needed for convenience functions that take a filename and return both the buffer and the Binary using that buffer. The C api now uses OwningBinary to avoid any change in semantics. I will start a new thread to see if we want to change it and how. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216002 91177308-0d34-0410-b5e6-96231b3b80d8
78 lines
2.5 KiB
C++
78 lines
2.5 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/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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/// This class acts as a container for the memory buffer used during generation
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/// 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.
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class ObjectBuffer {
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virtual void anchor();
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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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MemoryBufferRef getMemBuffer() const { return Buffer->getMemBufferRef(); }
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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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StringRef getBufferIdentifier() const {
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return Buffer->getBufferIdentifier();
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}
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protected:
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// The memory contained in an ObjectBuffer
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std::unique_ptr<MemoryBuffer> Buffer;
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};
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/// This class encapsulates the SmallVector and raw_svector_ostream needed to
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/// generate an object using MC code emission while providing a common
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/// ObjectBuffer interface for access to the memory once the object has been
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/// generated.
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class ObjectBufferStream : public ObjectBuffer {
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void anchor() override;
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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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