Re: Memory leaks upon error recovery in Yacc

"Timur Safin" <timur@lantel.ru>
1 Dec 2000 13:36:19 -0500

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Related articles
Memory leaks upon error recovery in Yacc davidpereira@home.com (David Pereira) (2000-11-18)
Re: Memory leaks upon error recovery in Yacc timur@lantel.ru (Timur Safin) (2000-12-01)
Re: Memory leaks upon error recovery in Yacc hannah@mamba.pond.sub.org (2000-12-18)
Re: Memory leaks upon error recovery in Yacc kapland@starfleet.com (2000-12-18)
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From: "Timur Safin" <timur@lantel.ru>
Newsgroups: comp.compilers
Date: 1 Dec 2000 13:36:19 -0500
Organization: Compilers Central
References: 00-11-132
Keywords: yacc, storage, comment
Posted-Date: 01 Dec 2000 13:36:19 EST

Hi David,


> This introduces a problem, however, because those semantic values
> popped off the stack, can contain pointers to subtrees... Therefore,
> I have memory leaks and I would like to deallocate those subtrees.


I'd suggest using stack-based memory allocator - alloca(). Once you
leave the current stack level, all the memory would be "deallocated"
automatically.


BTW this mechanism is used for maintaining bison own stack-memory.


Happy coding,
Timur Safin
mailto:timur@lantel.ru http://timur.lanit.ru
mailto:timur@intersystems.ru
[So long as you're willing to stick with C compilers that have alloca(),
it's not a bad solution. -John]

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