98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
#ifndef __StringHeap_H
|
|
#define __StringHeap_H
|
|
/*
|
|
* Copyright (c) 2002-2003 Stephen Williams (steve@icarus.com)
|
|
*
|
|
* This source code is free software; you can redistribute it
|
|
* and/or modify it in source code form under the terms of the GNU
|
|
* General Public License as published by the Free Software
|
|
* Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
#ifdef HAVE_CVS_IDENT
|
|
#ident "$Id: StringHeap.h,v 1.4 2003/03/01 06:25:30 steve Exp $"
|
|
#endif
|
|
|
|
/*
|
|
* The string heap is a way to permanently allocate strings
|
|
* efficiently. They only take up the space of the string characters
|
|
* and the terminating nul, there is no malloc overhead.
|
|
*/
|
|
class StringHeap {
|
|
|
|
public:
|
|
StringHeap();
|
|
~StringHeap();
|
|
|
|
const char*add(const char*);
|
|
|
|
private:
|
|
enum { HEAPCELL = 0x10000 };
|
|
|
|
char*cell_base_;
|
|
unsigned cell_ptr_;
|
|
unsigned cell_count_;
|
|
|
|
private: // not implemented
|
|
StringHeap(const StringHeap&);
|
|
StringHeap& operator= (const StringHeap&);
|
|
};
|
|
|
|
/*
|
|
* A lexical string heap is a string heap that makes an effort to
|
|
* return the same pointer for identical strings. This saves further
|
|
* space by not allocating duplicate strings, so in a system with lots
|
|
* of identifiers, this can theoretically save more space.
|
|
*/
|
|
class StringHeapLex : private StringHeap {
|
|
|
|
public:
|
|
StringHeapLex();
|
|
~StringHeapLex();
|
|
|
|
const char*add(const char*);
|
|
|
|
unsigned add_count() const;
|
|
unsigned add_hit_count() const;
|
|
|
|
private:
|
|
enum { HASH_SIZE = 4096 };
|
|
const char*hash_table_[HASH_SIZE];
|
|
|
|
unsigned add_count_;
|
|
unsigned hit_count_;
|
|
|
|
private: // not implemented
|
|
StringHeapLex(const StringHeapLex&);
|
|
StringHeapLex& operator= (const StringHeapLex&);
|
|
};
|
|
|
|
/*
|
|
* $Log: StringHeap.h,v $
|
|
* Revision 1.4 2003/03/01 06:25:30 steve
|
|
* Add the lex_strings string handler, and put
|
|
* scope names and system task/function names
|
|
* into this table. Also, permallocate event
|
|
* names from the beginning.
|
|
*
|
|
* Revision 1.3 2003/01/16 21:44:46 steve
|
|
* Keep some debugging status.
|
|
*
|
|
* Revision 1.2 2002/08/12 01:34:58 steve
|
|
* conditional ident string using autoconfig.
|
|
*
|
|
* Revision 1.1 2002/08/04 19:13:16 steve
|
|
* dll uses StringHeap for named items.
|
|
*
|
|
*/
|
|
#endif
|