[antlr-interest] Bug report; SCOPE_SIZE returning incorrect result in the C runtime

[Jim Idle]

Richard Thrippleton wrote:
> I was finding that SCOPE_SIZE(somescope) would report a scope size of 
> '1' when inside a dynamic scope (correct), '0' before entering that 
> scope (correct), but then '1' after leaving that scope (incorrect).
>
> The issue seems to be that the 'size' method on a stack returns the 
> amount of memory allocated for that stack, not the number of items in 
> the stack. My workaround was to modify C.stg
> "#define SCOPE_SIZE(scope)   ctx->p<name>_##scope##Stack_limit"
>
> (note that I've only verified this in 3.1.2, though it seems to be the 
> same in 3.1.3 based on a brief skim of the source)
>   
Yes, that is a bug caused by changing to caching the stack rather than 
clearing and recreating thousands of them. I will fix it in the 
development branch for tonights build.

You can now get the latest snapshot from:

   http://antlr.org/downloads (look for 
antlr-master-3.1.4-SNAPSHOT-completejar.jar).

This is a complete jar with all the dependencies built in so you can 
execute it with:

  java -jar antlr-master-3.1.4-SNAPSHOT-completejar.jar  t.g x.g

The jar is built and redeployed at about 1AM PDT every night.

Jim