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#include "antlr/ASTRefCount.h"
#include "antlr/AST.h"
ANTLR_BEGIN_NAMESPACE(antlr)
/**
* <b>SOFTWARE RIGHTS</b>
* <p>
* ANTLR 2.6.0 MageLang Insitute, 1999
* <p>
* We reserve no legal rights to the ANTLR--it is fully in the
* public domain. An individual or company may do whatever
* they wish with source code distributed with ANTLR or the
* code generated by ANTLR, including the incorporation of
* ANTLR, or its output, into commerical software.
* <p>
* We encourage users to develop software with ANTLR. However,
* we do ask that credit is given to us for developing
* ANTLR. By "credit", we mean that if you use ANTLR or
* incorporate any source code into one of your programs
* (commercial product, research project, or otherwise) that
* you acknowledge this fact somewhere in the documentation,
* research report, etc... If you like ANTLR and have
* developed a nice tool with the output, please mention that
* you developed it using ANTLR. In addition, we ask that the
* headers remain intact in our source code. As long as these
* guidelines are kept, we expect to continue enhancing this
* system and expect to make other tools available as they are
* completed.
* <p>
* The ANTLR gang:
* @version ANTLR 2.6.0 MageLang Insitute, 1999
* @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
* @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
* @author <br><a href="mailto:[email protected]">Pete Wells</a>
*/
ASTRef::ASTRef(AST* p)
: ptr(p), count(1)
{
if (p && !p->ref)
p->ref = this;
}
ASTRef::~ASTRef()
{
delete ptr;
}
ASTRef* ASTRef::increment()
{
++count;
return this;
}
bool ASTRef::decrement()
{
return (--count==0);
}
ASTRef* ASTRef::getRef(const AST* p)
{
if (p) {
AST* pp = const_cast<AST*>(p);
if (pp->ref)
return pp->ref->increment();
else
return new ASTRef(pp);
} else
return 0;
}
ANTLR_END_NAMESPACE
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