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Diffstat (limited to 'poxml/antlr/src/ASTRefCount.cpp')
-rw-r--r-- | poxml/antlr/src/ASTRefCount.cpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/poxml/antlr/src/ASTRefCount.cpp b/poxml/antlr/src/ASTRefCount.cpp new file mode 100644 index 00000000..1da98306 --- /dev/null +++ b/poxml/antlr/src/ASTRefCount.cpp @@ -0,0 +1,74 @@ +#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 + |