ASTRefCount.cpp
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上传日期:2007-01-06
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文件大小:2k
- #include "antlr/ASTRefCount.hpp"
- #include "antlr/AST.hpp"
- 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:pete@yamuna.demon.co.uk">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