mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-14 08:31:23 +00:00
89 lines
No EOL
2.7 KiB
C++
89 lines
No EOL
2.7 KiB
C++
/*
|
|
** memarena.h
|
|
**
|
|
**---------------------------------------------------------------------------
|
|
** Copyright 2010 Randy Heit
|
|
** All rights reserved.
|
|
**
|
|
** Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions
|
|
** are met:
|
|
**
|
|
** 1. Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** 2. 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.
|
|
** 3. The name of the author may not be used to endorse or promote products
|
|
** derived from this software without specific prior written permission.
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
**---------------------------------------------------------------------------
|
|
**
|
|
*/
|
|
|
|
#ifndef __MEMARENA_H
|
|
#define __MEMARENA_H
|
|
|
|
#include "zstring.h"
|
|
|
|
// A general purpose arena.
|
|
class FMemArena
|
|
{
|
|
public:
|
|
FMemArena();
|
|
~FMemArena();
|
|
|
|
void *Alloc(size_t size);
|
|
void FreeAll();
|
|
void FreeAllBlocks();
|
|
|
|
protected:
|
|
struct Block;
|
|
|
|
Block *AddBlock(size_t size);
|
|
void FreeBlockChain(Block *&top);
|
|
|
|
Block *TopBlock;
|
|
Block *FreeBlocks;
|
|
};
|
|
|
|
// An arena specializing in storage of FStrings. It knows how to free them,
|
|
// but this means it also should never be used for allocating anything else.
|
|
// Identical strings all return the same pointer.
|
|
class FSharedStringArena : public FMemArena
|
|
{
|
|
public:
|
|
FSharedStringArena();
|
|
~FSharedStringArena();
|
|
void FreeAll();
|
|
|
|
class FString *Alloc(const FString &source);
|
|
class FString *Alloc(const char *source);
|
|
class FString *Alloc(const char *source, size_t strlen);
|
|
|
|
protected:
|
|
struct Node
|
|
{
|
|
Node *Next;
|
|
FString String;
|
|
unsigned int Hash;
|
|
};
|
|
Node *Buckets[256];
|
|
|
|
Node *FindString(const char *str, size_t strlen, unsigned int &hash);
|
|
private:
|
|
void *Alloc(size_t size) { return NULL; } // No access to FMemArena::Alloc for outsiders.
|
|
};
|
|
|
|
|
|
#endif |