mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 15:11:24 +00:00
f12745f7a7
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183669 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
//===---- 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
|