111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
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#ifndef _ROSE_COMPRESSION_PSTAR_IMPL_H__
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#define _ROSE_COMPRESSION_PSTAR_IMPL_H__
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// Copyright 2007 Google Inc. All Rights Reserved.
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// Author: sears@google.com (Rusty Sears)
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#include <string.h>
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#include <assert.h>
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#include "pstar.h"
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#include "for.h"
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namespace rose {
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/**
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Appends a value to a page managed by pstar. For now, most of the
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"real work" is handled by the compression algorithm.
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This function simply checks the return value from the plugin. If
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the value should be stored as an exception, then it is prepended to
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the list of exceptions at end of the page. The compressed data is kept
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at the beginning of the page.
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*/
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template <class COMPRESSOR, class TYPE>
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slot_index_t
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Pstar<COMPRESSOR, TYPE>::append(int xid, const TYPE dat) {
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slot_index_t ret = plug_.append(xid, dat, freespace_ptr(), p_->memAddr,
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&free_bytes_);
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return free_bytes_ >= 0 ? ret : NOSPACE;
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}
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// The rest of this file interfaces with Stasis -------------------------
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/**
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Implementation of the Stasis pageLoaded() callback.
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@see stasis/page.h
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*/
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template <class COMPRESSOR, class TYPE>
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static void pStarLoaded(Page * p) {
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p->LSN = *stasis_page_lsn_ptr(p);
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p->impl = new Pstar<COMPRESSOR, TYPE>(p);
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}
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/**
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Implementation of the Stasis pageFlushed() callback.
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*/
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template <class COMPRESSOR, class TYPE>
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static void pStarFlushed(Page * p) {
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*stasis_page_lsn_ptr(p) = p->LSN;
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}
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template <class COMPRESSOR, class TYPE>
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static void pStarCleanup(Page * p) {
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delete (Pstar<COMPRESSOR, TYPE>*)p->impl;
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}
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/**
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Basic page_impl for pstar
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@see stasis/page.h
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*/
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static const page_impl pstar_impl = {
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-1,
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0, // pStarRead,
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0, // pStarWrite,
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0, // pStarReadDone,
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0, // pStarWriteDone,
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0, // pStarGetType,
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0, // pStarSetType,
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0, // pStarGetLength,
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0, // pStarFirst,
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0, // pStarNext,
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0, // pStarIsBlockSupported,
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0, // pStarBlockFirst,
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0, // pStarBlockNext,
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0, // pStarBlockDone,
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0, // pStarFreespace,
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0, // pStarCompact,
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0, // pStarPreRalloc,
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0, // pStarPostRalloc,
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0, // pStarFree,
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0, // dereference_identity,
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0, // pStarLoaded,
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0, // pStarFlushed
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0, // pStarCleanup
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};
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/**
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Be sure to call "registerPageType(Pstar<...>::impl())" once for
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each template instantiation that Stasis might encounter, even if a
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particular binary might not use that instantiation. This must be
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done before calling Tinit().
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@see registerPageType() from Stasis.
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*/
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template<class COMPRESSOR, class TYPE>
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page_impl
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Pstar<COMPRESSOR, TYPE>::impl() {
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page_impl ret = pstar_impl;
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ret.page_type = plugin_id<Pstar<COMPRESSOR,TYPE>,COMPRESSOR,TYPE>();
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ret.pageLoaded = pStarLoaded<COMPRESSOR, TYPE>;
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ret.pageFlushed = pStarFlushed<COMPRESSOR, TYPE>;
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ret.pageCleanup = pStarCleanup<COMPRESSOR, TYPE>;
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return ret;
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}
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} // namespace rose
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#endif // _ROSE_COMPRESSION_PSTAR_IMPL_H__
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