I'm trying to implement a Tree Grammar for my Lexer and Parser.
In my Tree Grammar, I specify:
> tree grammar m2Emit;
>
> options { language=C;
> ASTLabelType=pANTLR3_COMMON_TREE;
> }
Further down, I have a rule:
> stmt
> : ^(ASSIGN assLhs=ref assExp=exp )
> ;
When I compile, I see the following errors:
> m2Emit.c: In function ‘m2Emit_exp_return exp(m2Emit_Ctx_struct*)’:
> m2Emit.c:1113:20: error: cannot convert ‘ANTLR3_BASE_TREE_struct*’ to
> ‘ANTLR3_COMMON_TREE_struct*’ in assignment
> m2Emit.c: In function ‘m2Emit_ref_return ref(m2Emit_Ctx_struct*)’:
> m2Emit.c:2193:20: error: cannot convert ‘ANTLR3_BASE_TREE_struct*’ to
> ‘ANTLR3_COMMON_TREE_struct*’ in assignment
In m2Emit.c, I can see the following code:
> retval.start = LT(1); retval.stop = retval.start;
It looks like LT(1) is an ANTLR3_BASE_TREE_struct*, while retval.start
is an ANTLR3_COMMON_TREE_struct*.
Is this a bug, or did I miss some important documentation?
In case it matters, I'm trying to compile as C++....
--
Kevin J. Cummings
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