Re: Heap pointers

"Gene" <gene.ressler@gmail.com>
1 Nov 2005 00:21:57 -0500

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From: "Gene" <gene.ressler@gmail.com>
Newsgroups: comp.compilers
Date: 1 Nov 2005 00:21:57 -0500
Organization: http://groups.google.com
References: 05-10-204
Keywords: GC, storage

For the runtime part, you might study the Boehm garbage collector,
which uses some of the techniques that John mentions.


http://www.hpl.hp.com/personal/Hans_Boehm/gc/


A compile-time part is pretty standard data flow analysis, somewhat
easier than general alias analysis. (See for example the "dragon book"
Compiler Design, Aho, Sethi, and Ullman.) Essentially it's a reaching
definitions problem. If a pointer use can be reached only by
definitions of one type (stack or heap) then you can safely tag that
use. Otherwise it remains untagged, a "don't know" case.


Gene


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