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114 lines
3 KiB
C++
114 lines
3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _MDB_
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#include "mdb.h"
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#endif
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#ifndef _MORK_
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#include "mork.h"
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#endif
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#ifndef _MORKNODE_
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#include "morkNode.h"
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#endif
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#ifndef _MORKSTORE_
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#include "morkStore.h"
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#endif
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#ifndef _MORKPOOL_
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#include "morkPool.h"
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#endif
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#ifndef _MORKENV_
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#include "morkEnv.h"
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#endif
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#ifndef _MORKCELL_
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#include "morkCell.h"
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#endif
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//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
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void
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morkCell::SetYarn(morkEnv* ev, const mdbYarn* inYarn, morkStore* ioStore)
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{
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morkAtom* atom = ioStore->YarnToAtom(ev, inYarn, true /* create */);
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if ( atom )
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this->SetAtom(ev, atom, ioStore->StorePool()); // refcounts atom
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}
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void
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morkCell::GetYarn(morkEnv* ev, mdbYarn* outYarn) const
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{
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MORK_USED_1(ev);
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morkAtom::GetYarn(mCell_Atom, outYarn);
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}
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void
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morkCell::AliasYarn(morkEnv* ev, mdbYarn* outYarn) const
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{
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MORK_USED_1(ev);
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morkAtom::AliasYarn(mCell_Atom, outYarn);
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}
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void
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morkCell::SetCellClean()
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{
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mork_column col = this->GetColumn();
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this->SetColumnAndChange(col, morkChange_kNil);
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}
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void
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morkCell::SetCellDirty()
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{
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mork_column col = this->GetColumn();
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this->SetColumnAndChange(col, morkChange_kAdd);
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}
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void
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morkCell::SetAtom(morkEnv* ev, morkAtom* ioAtom, morkPool* ioPool)
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// SetAtom() "acquires" the new ioAtom if non-nil, by calling AddCellUse()
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// to increase the refcount, and puts ioAtom into mCell_Atom. If the old
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// atom in mCell_Atom is non-nil, then it is "released" first by a call to
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// CutCellUse(), and if the use count then becomes zero, then the old atom
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// is deallocated by returning it to the pool ioPool. (And this is
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// why ioPool is a parameter to this method.) Note that ioAtom can be nil
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// to cause the cell to refer to nothing, and the old atom in mCell_Atom
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// can also be nil, and all the atom refcounting is handled correctly.
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//
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// Note that if ioAtom was just created, it typically has a zero use count
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// before calling SetAtom(). But use count is one higher after SetAtom().
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{
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morkAtom* oldAtom = mCell_Atom;
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if ( oldAtom != ioAtom ) // ioAtom is not already installed in this cell?
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{
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if ( oldAtom )
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{
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mCell_Atom = 0;
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if ( oldAtom->CutCellUse(ev) == 0 )
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{
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// this was zapping atoms still in use - comment out until davidmc
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// can figure out a better fix.
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// if ( ioPool )
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// {
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// if ( oldAtom->IsBook() )
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// ((morkBookAtom*) oldAtom)->CutBookAtomFromSpace(ev);
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// ioPool->ZapAtom(ev, oldAtom);
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// }
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// else
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// ev->NilPointerError();
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}
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}
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if ( ioAtom )
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ioAtom->AddCellUse(ev);
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mCell_Atom = ioAtom;
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}
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}
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//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
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