// 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)
based on code by Marc Shapiro (shapiro@sor.inria.fr)
This file is part of GNU CC.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY. No author or distributor
accepts responsibility to anyone for the consequences of using it
or for whether it serves any particular purpose or works at all,
unless he says so in writing. Refer to the GNU CC General Public
License for full details.
Everyone is granted permission to copy, modify and redistribute
GNU CC, but only under the conditions described in the
GNU CC General Public License. A copy of this license is
supposed to have been given to you along with GNU CC so you
can know your rights and responsibilities. It should be in a
file named COPYING. Among other things, the copyright notice
and this notice must be preserved on all copies.
<T>MChunk::<T>MChunk(<T>* d,
: <T>IChunk(d, baseidx, lowidx, fenceidx, topidx)
unsigned msize = (top - base)/_MAP_BITS + 1;
map = (unsigned long *) (new long[msize]);
bzero((void*)map, msize * sizeof(long));
void <T>MChunk:: shrink_high ()
if (fence <= low) empty_error();
void <T>MChunk:: shrink_low ()
if (fence <= low) empty_error();
void <T>MChunk::clear(int lo)
bzero((void*)map, ((top - base)/_MAP_BITS + 1) * sizeof(long));
void <T>MChunk::cleardown(int hi)
bzero((void*)map, ((top - base)/_MAP_BITS + 1) * sizeof(long));
int <T>MChunk::del(int idx)
if (idx < low || idx >= fence) index_error();
int <T>MChunk::undel(int idx)
if (idx < low || idx >= fence) index_error();
int <T>MChunk::unused_index() const
if (unused_indices() == 0) index_error();
if (low == base) // can traverse 32 slots at a time
while (map[blk] == ~0L) ++blk;
slot = blk * _MAP_BITS + base;
while(valid(slot)) ++slot;
int <T>MChunk::first_index() const
if (empty()) return fence;
while (map[blk] == 0) ++blk;
slot = blk * _MAP_BITS + base;
while(!valid(slot)) ++slot;
int <T>MChunk::last_index() const
if (empty()) return low - 1;
int blk = (top - base) / _MAP_BITS;
while (map[blk] == 0) --blk;
slot = blk * _MAP_BITS + base + _MAP_BITS - 1;
while(!valid(slot)) --slot;
int <T>MChunk:: OK() const
int v = data != 0; // have some data
v &= map != 0; // and a map
v &= base <= low; // ok, index-wise
v &= ((<T>MChunk*)(nxt->prev())) == this; // and links are OK
v &= ((<T>MChunk*)(prv->next())) == this;
int bitcount = 0; // and unused count correct
for (int i = low; i < fence; ++i) if (!valid(i)) ++bitcount;
if (!v) error("invariant failure");
<T>* <T>MChunk::succ(<T>* p) const
int i = ((int) p - (int) data) / sizeof(<T>) + base + 1;
if (p == 0 || i < low) return 0;
while (i < fence && !valid(i)) ++i;
if (i >= fence) return 0;
<T>* <T>MChunk::pred(<T>* p) const
int i = ((int) p - (int) data) / sizeof(<T>) + base - 1;
if (p == 0 || i >= fence) return 0;
while (i >= low && !valid(i)) --i;
<T>* <T>MChunk::first_pointer() const
while (map[blk] == 0) ++blk;
slot = blk * _MAP_BITS + base;
while(!valid(slot)) ++slot;
<T>* <T>MChunk::last_pointer() const
int blk = (top - base) / _MAP_BITS;
while (map[blk] == 0) --blk;
slot = blk * _MAP_BITS + base + _MAP_BITS - 1;
while(!valid(slot)) --slot;
csize = DEFAULT_INITIAL_CAPACITY;
<T>* data = new <T>[csize];
hd = ch = new <T>MChunk(data, lo, lo, fnc, lo+csize);
<T>MPlex:: <T>MPlex(int chunksize)
if (chunksize == 0) error("invalid constructor specification");
<T>* data = new <T>[csize];
hd = ch = new <T>MChunk(data, lo, lo, fnc, csize);
<T>* data = new <T>[csize];
hd = ch = new <T>MChunk(data, chunksize, lo, fnc, fnc);
<T>MPlex:: <T>MPlex(int l, int chunksize)
if (chunksize == 0) error("invalid constructor specification");
<T>* data = new <T>[csize];
hd = ch = new <T>MChunk(data, lo, lo, fnc, csize+lo);
<T>* data = new <T>[csize];
hd = ch = new <T>MChunk(data, chunksize+lo, lo, fnc, fnc);
void <T>MPlex::make_initial_chunks(int up)
<T>* data = new <T> [csize];
<T>MChunk* h = new <T>MChunk(data, l, l, l+sz, l+csize);
<T>* data = new <T> [csize];
<T>MChunk* h = new <T>MChunk(data, hi-csize, hi-sz, hi, hi);
<T>MPlex:: <T>MPlex(int l, int hi, const <T&> initval, int chunksize)
for (int i=lo; i<fnc; ++i)
<T>MPlex::<T>MPlex(const <T>MPlex& a)
const <T>IChunk* p = a.hd;
<T>* data = new <T> [p->size()];
<T>MChunk* h = new <T>MChunk(data, p->base_index(),
p->low_index(), p->fence_index(), p->top_index());
for (int i = a.low(); i < a.fence(); a.next(i))
void <T>MPlex::operator= (const <T>MPlex& a)
const <T>IChunk* p = a.hd;
<T>* data = new <T> [p->size()];
<T>MChunk* h = new <T>MChunk(data, p->base_index(),
p->low_index(), p->fence_index(),
for (int i = a.low(); i < a.fence(); a.next(i))
int <T>MPlex::valid(int idx) const
const <T>MChunk* tail = (<T>MChunk*)tl();
while (idx >= t->fence_index())
t = ((<T>MChunk*)(t->next()));
while (idx < t->low_index())
if (t == (<T>MChunk*)(hd)) return 0;
t = ((<T>MChunk*)(t->prev()));
return t-><T>MChunk::valid_index(idx);
void <T>MPlex::cache(int idx) const
const <T>MChunk* tail = (<T>MChunk*)tl();
while (idx >= t->fence_index())
if (t == tail) index_error();
t = ((<T>MChunk*)(t->next()));
while (idx < t->low_index())
if (t == (<T>MChunk*)hd) index_error();
t = ((<T>MChunk*)(t->prev()));
if (!t-><T>MChunk::valid_index(idx)) index_error();
void <T>MPlex::cache(const <T>* p) const
const <T>MChunk* old = ch;
while (!t->actual_pointer(p))
t = ((<T>MChunk*)(t->next()));
if (t == old) index_error();
if (!t-><T>MChunk::valid_pointer(p)) index_error();
int <T>MPlex::owns(Pix px) const
const <T>MChunk* old = ch;
while (!t->actual_pointer(p))
t = ((<T>MChunk*)(t->next()));
return t-><T>MChunk::valid_pointer(p);
int <T>MPlex::add_high(const <T&> elem)
<T>MChunk* t = ((<T>MChunk*) tl());
<T>* data = new <T> [csize];
t = (new <T>MChunk(data, fnc,fnc,fnc,fnc+csize));
*((t-><T>MChunk::grow_high())) = elem;
int <T>MPlex::add_low (const <T&> elem)
<T>MChunk* t = ((<T>MChunk*) hd);
<T>* data = new <T> [csize];
hd = new <T>MChunk(data, lo-csize, lo, lo, lo);
*((t-><T>MChunk::grow_low())) = elem;
void <T>MPlex::adjust_bounds()
<T>MChunk* t = ((<T>MChunk*) tl());
while (t-><T>MChunk::empty() && !one_chunk())
<T>MChunk* pred = (<T>MChunk*)(t->prev());
while (t-><T>MChunk::empty() && !one_chunk())
hd = (<T>MChunk*)(t->next());
int <T>MPlex::del_high ()
if (empty()) empty_error();
<T>MChunk* t = ((<T>MChunk*) tl());
while (t-><T>MChunk::empty() && !one_chunk()) // possible stragglers
<T>MChunk* pred = (<T>MChunk*)(t->prev());
t-><T>MChunk::shrink_high();
while (t-><T>MChunk::empty() && !one_chunk())
<T>MChunk* pred = (<T>MChunk*)(t->prev());
unused -= oldfnc - fnc - 1;
if (empty()) empty_error();
<T>MChunk* t = ((<T>MChunk*) hd);
while (t-><T>MChunk::empty() && !one_chunk())
hd = (<T>MChunk*)(t->next());
t-><T>MChunk::shrink_low();
while (t-><T>MChunk::empty() && !one_chunk())
hd = (<T>MChunk*)(t->next());
unused -= lo - oldlo - 1;
int <T>MPlex::add(const <T&> elem)
t->unused_indices() == 0;
t = (<T>MChunk*)(t->prev()))
int i = t->unused_index();
int <T>MPlex::unused_index() const
if (unused == 0) index_error();
t->unused_indices() == 0;
t = (<T>MChunk*)(t->prev()))
return t->unused_index();
Pix <T>MPlex::unused_Pix() const
if (unused == 0) return 0;
t->unused_indices() == 0;
t = (<T>MChunk*)(t->prev()))
return t->pointer_to(t->unused_index());
int <T>MPlex::del_index(int idx)
if (idx < lo || idx >= fnc) index_error();
if (<T>MPlex::valid(idx))
int <T>MPlex::dopred(int idx) const
if (idx >= fnc) idx = fnc;
if (idx <= lo) return lo - 1;
while (idx > t->fence_index())
t = ((<T>MChunk*)(t->next()));
while (idx <= t->low_index())
t = ((<T>MChunk*)(t->prev()));
int i = t-><T>MChunk::pred(idx);
while (i < t->low_index() && i >= lo)
t = ((<T>MChunk*)(t->prev()));
i = t-><T>MChunk::last_index();
int <T>MPlex::dosucc(int idx) const
if (idx >= fnc - 1) return fnc;
while (idx >= t->fence_index())
t = ((<T>MChunk*)(t->next()));
while (idx < t->low_index())
t = ((<T>MChunk*)(t->prev()));
int i = t-><T>MChunk::succ(idx);
while (i >= t->fence_index() && i < fnc)
t = (<T>MChunk*)(t->next());
i = t-><T>MChunk::first_index();
void <T>MPlex::prev(Pix& i) const
const <T>MChunk* old = ch;
while (!t->actual_pointer(p))
t = ((<T>MChunk*)(t->prev()));
<T>* q = t-><T>MChunk::pred(p);
while (q == 0 && t != (<T>MChunk*)hd)
t = ((<T>MChunk*)(t->prev()));
q = t-><T>MChunk::last_pointer();
void <T>MPlex::next(Pix& i) const
const <T>MChunk* tail = (<T>MChunk*)(tl());
const <T>MChunk* old = ch;
while (!t->actual_pointer(p))
t = ((<T>MChunk*)(t->next()));
<T>* q = t-><T>MChunk::succ(p);
while (q == 0 && t != tail)
t = ((<T>MChunk*)(t->next()));
q = t-><T>MChunk::first_pointer();
void <T>MPlex::undel_index(int idx)
if (idx < lo || idx >= fnc) index_error();
while (idx >= t->fence_index())
t = ((<T>MChunk*)(t->next()));
while (idx < t->low_index())
t = ((<T>MChunk*)(t->prev()));
int was_present = t-><T>MChunk::undel(idx);
<T>MChunk* t = ((<T>MChunk*)tl());
<T>MChunk* prv = (<T>MChunk*)(t->prev());
int <T>MPlex::OK () const
int v = hd != 0; // at least one chunk
int found_ch = 0; // to make sure ch is in list;
int count = 0; // to count unused slots
const <T>MChunk* t = (<T>MChunk*)(hd);
int gap = t->low_index() - lo;
v &= gap == 0; // hd lo not less than lo.
v &= t-><T>MChunk::OK(); // each chunk is OK
count += t->unused_indices();
if (t == (<T>MChunk*)(tl()))
else // and has indices less than succ
gap = t->next()->base_index() - t->top_index();
if (t != (<T>MChunk*)hd) // internal chunks can't grow
v &= !t->can_grow_low() && !t->can_grow_high();
t = (const <T>MChunk*)(t->next());
gap = fnc - t->fence_index();
v &= count == unused; // chunk counts agree with plex
if (!v) error("invariant failure");