From 6f94c3c8d755d1cdd3854fde5741305afcd44b19 Mon Sep 17 00:00:00 2001
From: Steve Reinhardt <stever@eecs.umich.edu>
Date: Sat, 2 Dec 2006 22:22:58 -0800
Subject: Make cache compression policy a runtime virtual thing instead of a
 template policy.

--HG--
extra : convert_revision : 6a4ac7a189a950390a973fdfce94f56190de92db
---
 src/base/compression/base.hh             | 71 ++++++++++++++++++++++++++++++++
 src/base/compression/lzss_compression.hh |  4 +-
 src/base/compression/null_compression.hh | 28 +++----------
 3 files changed, 78 insertions(+), 25 deletions(-)
 create mode 100644 src/base/compression/base.hh

(limited to 'src/base/compression')

diff --git a/src/base/compression/base.hh b/src/base/compression/base.hh
new file mode 100644
index 000000000..8d1f8d6b5
--- /dev/null
+++ b/src/base/compression/base.hh
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2003-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Erik Hallnor
+ *          Nathan Binkert
+ */
+
+#ifndef __BASE_COMPRESSION_BASE_HH__
+#define __BASE_COMPRESSION_BASE_HH__
+
+/**
+ * @file
+ * This file defines a base (abstract virtual) compression algorithm object.
+ */
+
+#include <inttypes.h>
+
+/**
+ * Abstract virtual compression algorithm object.
+ */
+class CompressionAlgorithm
+{
+  public:
+    virtual ~CompressionAlgorithm() {}
+
+    /**
+     * Uncompress the data, causes a fatal since no data should be compressed.
+     * @param dest The output buffer.
+     * @param src  The compressed data.
+     * @param size The number of bytes in src.
+     *
+     * @retval The size of the uncompressed data.
+     */
+    virtual int uncompress(uint8_t * dest, uint8_t *src, int size) = 0;
+
+    /**
+     * Compress the data, just returns the source data.
+     * @param dest The output buffer.
+     * @param src  The data to be compressed.
+     * @param size The number of bytes in src.
+     *
+     * @retval The size of the compressed data.
+     */
+    virtual int compress(uint8_t *dest, uint8_t *src, int size) = 0;
+};
+
+#endif //__BASE_COMPRESSION_BASE_HH__
diff --git a/src/base/compression/lzss_compression.hh b/src/base/compression/lzss_compression.hh
index 35e4dcb3f..a23d07ffd 100644
--- a/src/base/compression/lzss_compression.hh
+++ b/src/base/compression/lzss_compression.hh
@@ -35,12 +35,12 @@
  * LZSSCompression declarations.
  */
 
-#include "sim/host.hh" // for uint8_t
+#include "base/compression/base.hh"
 
 /**
  * Simple LZSS compression scheme.
  */
-class LZSSCompression
+class LZSSCompression : public CompressionAlgorithm
 {
     /**
      * Finds the longest substring for the given offset.
diff --git a/src/base/compression/null_compression.hh b/src/base/compression/null_compression.hh
index 5a582d828..ff110807a 100644
--- a/src/base/compression/null_compression.hh
+++ b/src/base/compression/null_compression.hh
@@ -38,41 +38,23 @@
  */
 
 #include "base/misc.hh" // for fatal()
-#include "sim/host.hh"
+#include "base/compression/base.hh"
 
 
 /**
  * A dummy compression class to use when no data compression is desired.
  */
-class NullCompression
+class NullCompression : public CompressionAlgorithm
 {
   public:
-    /**
-     * Uncompress the data, causes a fatal since no data should be compressed.
-     * @param dest The output buffer.
-     * @param src  The compressed data.
-     * @param size The number of bytes in src.
-     *
-     * @retval The size of the uncompressed data.
-     */
-    static int uncompress(uint8_t * dest, uint8_t *src, int size)
+    int uncompress(uint8_t * dest, uint8_t *src, int size)
     {
         fatal("Can't uncompress data");
     }
 
-    /**
-     * Compress the data, just returns the source data.
-     * @param dest The output buffer.
-     * @param src  The data to be compressed.
-     * @param size The number of bytes in src.
-     *
-     * @retval The size of the compressed data.
-     */
-
-    static int compress(uint8_t *dest, uint8_t *src, int size)
+    int compress(uint8_t *dest, uint8_t *src, int size)
     {
-        memcpy(dest,src,size);
-        return size;
+        fatal("Can't compress data");
     }
 };
 
-- 
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