Re: [Valgrind-developers] use of variable length arrays

[Florian K. <br...@ac...>]

On 06/28/2012 01:27 PM, Julian Seward wrote:
> 
> (general question) what does the standard says happens if the array size is
> zero or negative, at run time?
> 

You get "undefined behaviour". When evaluated, the array size shall be
greater than zero.

> Ok for the change provided that 
> 
> (1) the num-callers is limited to some sane values at startup so we can't
>     trash the stack.  >= 1 and <= 500 say.  The V thread stacks are small
>     (64k) (or were, at least, maybe not any more)

OK.

> 
> (2) this doesn't change the amount of memory required to store the ExeContexts
>     in the heap (but I'm sure it doesn't -- you're only talking about stack
>     allocation, right?)

Right, this is only about the stack-allocated array. No effect on the
memory spent for ExeContexts.

   Florian