From 6de2c08bc400b4aca9fb46684e8bdb56eed9b09f Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Sun, 2 Dec 2012 13:10:19 +0000
Subject: Vendor import of llvm release_32 branch r168974 (effectively, 3.2
RC2): http://llvm.org/svn/llvm-project/llvm/branches/release_32@168974
---
include/llvm/ExecutionEngine/ObjectBuffer.h | 80 +++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)
create mode 100644 include/llvm/ExecutionEngine/ObjectBuffer.h
(limited to 'include/llvm/ExecutionEngine/ObjectBuffer.h')
diff --git a/include/llvm/ExecutionEngine/ObjectBuffer.h b/include/llvm/ExecutionEngine/ObjectBuffer.h
new file mode 100644
index 0000000..a0a77b8
--- /dev/null
+++ b/include/llvm/ExecutionEngine/ObjectBuffer.h
@@ -0,0 +1,80 @@
+//===---- 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/ADT/OwningPtr.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/MemoryBuffer.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(); }
+
+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
--
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