[antlr-interest] C runtime issue

[Gavin Lambert]

At 10:37 3/02/2009, Andy Grove wrote:
>When I invoke my generated C parser, I see memory usage climb 
>from 770MB to 4GB in a few seconds and the parser never returns. 
>My init code is as follows:
[...]
>I added some printf() statements to the generated code and 
>tracked the issue down to the "LA(1)" macro which expands to 
>"ctx->pParser->tstream->istream->_LA(ctx->pParser->tstream->istream, 
>1)". It seems that this call never completes. Here is the code in 
>question:

If this is happening the first time this is called (which it 
sounds like is the case), then the problem is with your lexer 
grammar/rules.

Most likely, you have created an infinite loop in the lexer.  The 
most likely reason for this in turn is that you have created a 
top-level lexer rule that can successfully match zero 
characters.  And the most likely cause of that in turn is that 
you've used * when you really mean +.