[antlr-interest] tree walker executes method call twice?

[Rob Dougan]

pass 1 - lex/parse produces heteroAst (nil root)

pass 2 - heteroAst  into symbol table walker 

nodes reset

pass 3 - heteroAst into type checking walker  (adds type info to ast)  ---> walks twice

 

its just a typical expression tree (C-like), the function call (abs(1.0)) is the smallest statement I could get to fail

but

the tree walker always walks the input twice ... almost like the tree was duplicated

hmmm

will continue investigating ... 

 

R


Date: Tue, 18 Aug 2009 12:58:43 -0700
From: jimi at temporal-wave.com
CC: antlr-interest at antlr.org
Subject: Re: [antlr-interest] tree walker executes method call twice?

Rob Dougan wrote: 


 
during testing i noticed that my tree walker seems to be walking the tree twice ...
  
anyone spot a grammar problem?
  
What does the input tree look like?

Jim
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