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97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/*
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** memarena.h
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**
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**---------------------------------------------------------------------------
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** Copyright 2010 Randy Heit
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#ifndef __MEMARENA_H
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#define __MEMARENA_H
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#include "zstring.h"
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// A general purpose arena.
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class FMemArena
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{
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public:
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FMemArena(size_t blocksize = 10*1024);
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~FMemArena();
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void *Alloc(size_t size);
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void FreeAll();
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void FreeAllBlocks();
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void DumpInfo();
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void DumpData(FILE *f);
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protected:
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struct Block;
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Block *AddBlock(size_t size);
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void FreeBlockChain(Block *&top);
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void *iAlloc(size_t size);
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Block *TopBlock;
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Block *FreeBlocks;
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size_t BlockSize;
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};
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// An arena specializing in storage of FStrings. It knows how to free them,
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// but this means it also should never be used for allocating anything else.
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// Identical strings all return the same pointer.
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class FSharedStringArena : public FMemArena
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{
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public:
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FSharedStringArena();
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~FSharedStringArena();
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void FreeAll();
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class FString *Alloc(const FString &source);
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class FString *Alloc(const char *source);
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class FString *Alloc(const char *source, size_t strlen);
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protected:
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struct Node
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{
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Node *Next;
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FString String;
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unsigned int Hash;
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};
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enum
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{
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Bucket_Count = 256
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};
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Node *Buckets[Bucket_Count];
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Node *FindString(const char *str, size_t strlen, unsigned int &hash);
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private:
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void *Alloc(size_t size) { return NULL; } // No access to FMemArena::Alloc for outsiders.
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};
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#endif
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