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// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1988 Free Software Foundation
written by Doug Lea (dl@rocky.oswego.edu)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _Obstack_h
#ifdef __GNUG__
#pragma interface
#endif
#define _Obstack_h 1
#include <std.h>
class Obstack
{
struct _obstack_chunk
{
char* limit;
_obstack_chunk* prev;
char contents[4];
};
protected:
long chunksize;
_obstack_chunk* chunk;
char* objectbase;
char* nextfree;
char* chunklimit;
int alignmentmask;
void _free(void* obj);
void newchunk(int size);
public:
Obstack(int size = 4080, int alignment = 4); // 4080=4096-mallocslop
~Obstack();
void* base();
void* next_free();
int alignment_mask();
int chunk_size();
int size();
int room();
int contains(void* p); // does Obstack hold pointer p?
void grow(const void* data, int size);
void grow(const void* data, int size, char terminator);
void grow(const char* s);
void grow(char c);
void grow_fast(char c);
void blank(int size);
void blank_fast(int size);
void* finish();
void* finish(char terminator);
void* copy(const void* data, int size);
void* copy(const void* data, int size, char terminator);
void* copy(const char* s);
void* copy(char c);
void* alloc(int size);
void free(void* obj);
void shrink(int size = 1); // suggested by ken@cs.rochester.edu
int OK(); // rep invariant
};
inline Obstack::~Obstack()
{
_free(0);
}
inline void* Obstack::base()
{
return objectbase;
}
inline void* Obstack::next_free()
{
return nextfree;
}
inline int Obstack::alignment_mask()
{
return alignmentmask;
}
inline int Obstack::chunk_size()
{
return chunksize;
}
inline int Obstack::size()
{
return nextfree - objectbase;
}
inline int Obstack::room()
{
return chunklimit - nextfree;
}
inline void Obstack:: grow(const void* data, int size)
{
if (nextfree+size > chunklimit)
newchunk(size);
memcpy(nextfree, data, size);
nextfree += size;
}
inline void Obstack:: grow(const void* data, int size, char terminator)
{
if (nextfree+size+1 > chunklimit)
newchunk(size+1);
memcpy(nextfree, data, size);
nextfree += size;
*(nextfree)++ = terminator;
}
inline void Obstack:: grow(const char* s)
{
grow((const void*)s, strlen(s), 0);
}
inline void Obstack:: grow(char c)
{
if (nextfree+1 > chunklimit)
newchunk(1);
*(nextfree)++ = c;
}
inline void Obstack:: blank(int size)
{
if (nextfree+size > chunklimit)
newchunk(size);
nextfree += size;
}
inline void* Obstack::finish(char terminator)
{
grow(terminator);
return finish();
}
inline void* Obstack::copy(const void* data, int size)
{
grow (data, size);
return finish();
}
inline void* Obstack::copy(const void* data, int size, char terminator)
{
grow(data, size, terminator);
return finish();
}
inline void* Obstack::copy(const char* s)
{
grow((const void*)s, strlen(s), 0);
return finish();
}
inline void* Obstack::copy(char c)
{
grow(c);
return finish();
}
inline void* Obstack::alloc(int size)
{
blank(size);
return finish();
}
inline void Obstack:: free(void* obj)
{
if (obj >= (void*)chunk && obj<(void*)chunklimit)
nextfree = objectbase = (char *) obj;
else
_free(obj);
}
inline void Obstack:: grow_fast(char c)
{
*(nextfree)++ = c;
}
inline void Obstack:: blank_fast(int size)
{
nextfree += size;
}
inline void Obstack:: shrink(int size) // from ken@cs.rochester.edu
{
if (nextfree >= objectbase + size)
nextfree -= size;
}
#endif
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