[antlr-interest] [C-target] Child-parent relationship

[Дмитрий Ильин]

*antlr-3.2 and libantlr3c-3.2*



> What version of the runtime? What version of the ANTLR tool?
>
> Jim
>
>
> >* -----Original Message-----
> *>* From: antlr-interest-bounces at antlr.org <http://www.antlr.org/mailman/listinfo/antlr-interest> [mailto:antlr-interest-
> *>* bounces at antlr.org <http://www.antlr.org/mailman/listinfo/antlr-interest>] On Behalf Of ??????? ?????
> *>* Sent: Wednesday, April 27, 2011 11:27 PM
> *>* To: antlr-interest at antlr.org <http://www.antlr.org/mailman/listinfo/antlr-interest>
> *>* Subject: [antlr-interest] [C-target] Child-parent relationship
> *>*
> *>* I took "simplecTreeParser" example, antlr-3.2 and libantlr3c-3.2 ( + ms
> *>* vs 2005). After generating AST (after "SimpleCAST = psr-
> *>* >program(psr);") and after checking count of errors I inserted this
> *>* code:
> *>*
> *>* correctParent = SimpleCAST.tree;
> *>* child = (pANTLR3_BASE_TREE)(correctParent->getChild(correctParent, 0));
> *>* suggestedParent = (pANTLR3_BASE_TREE)(child->getParent(child));
> *>* if (correctParent == suggestedParent)
> *>* printf("\n\nCorrect\n\n");
> *>*  else
> *>* printf("\n\nIncorrect\n\n");
> *>*
> *>* So after execution "Incorrect" was printed. Because
> *>* ((pANTLR3_COMMON_TREE)child->super)->parent had NULL. It seems to me it
> *>* happens due to error in implementaion of "setParent" function in
> *>* antlr3commontree.c. I also used Python target and python's "setParent"
> *>* has diffrent logic.
> *>*
> *>* Dmitry Ilyin
> *>*
> *>*
> *>* Take a look at antlr.markmail.org for other examples but where are you
> *>* >
> *>* trying to get the parent, in the parser before you have built the AST
> *>* (it
> *>* >
> *>* sounds like this) or in the tree walker? You should not need to change
> *>* any
> *>* >
> *>* of the runtime functions; you are probably just making them do things
> *>* that
> *>* >
> *>* are going to get done anyway at the end of the rule. Look at the
> *>* generated
> *>* >
> *>* code for ways to traverse the tree. I suppose there could be a bug, but
> *>* ut
> *>* >
> *>* seems a bit unlikely at this point.
> *>* >
> *>*
> *>* > Jim
> *>* >
> *>*
> *>* > > -----Original Message-----
> *>* >
> *>* > From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> *>* >
> *>* > bounces at antlr.org] On Behalf Of ??????? ?????
> *>* >
> *>* > Sent: Wednesday, April 27, 2011 11:15 AM
> *>* >
> *>* > To: antlr-interest at antlr.org
> *>* >
> *>* > Subject: [antlr-interest] [C-target] Child-parent relationship
> *>* >
> *>* >
> *>* >
> *>* > Sorry, I have no exp in using mailing lists, so I hope i'm doing
> *>* right.
> *>* >
> *>* > I'm trying to get parent of AST node, but "getParent" function
> *>* returns
> *>* >
> *>* > 0x00000001c address. Because pointer to parent of the node's super is
> *>* >
> *>* > equal to NULL. But when I've changed functions "addChild" and
> *>* >
> *>* > "setParent" all child-parent relationships become correct.
> *>* >
> *>* > Dmitry Ilyin
> *>* >
> *>* >
> *>* >
> *>* > List: http://www.antlr.org/mailman/listinfo/antlr-interest
> *>* >
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