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authorAndy Wingo <wingo@pobox.com>2009-07-19 19:48:26 +0200
committerAndy Wingo <wingo@pobox.com>2009-07-22 00:13:52 +0200
commit8d90b356560b9cf54300ff9eabf4675acb650e03 (patch)
tree2193d51f330ab4a827be3559cbf3ac3208b18b57 /libguile/frames.c
parenta5cfddd560ca21205c8b0417413253d94f3e9b93 (diff)
downloadguile-8d90b356560b9cf54300ff9eabf4675acb650e03.tar.gz
vm support for display closures
* libguile/vm-i-system.c (box, empty-box): Boxing values and storing them in local variables. (local-boxed-ref, local-boxed-set): A combination of local-ref then variable-ref/set. (make-closure2, closure-ref, closure-boxed-ref, closure-boxed-set): New ops. The idea is to migrate Guile over to using flat dispay closures. See the paper "Three Implementation Models for Scheme" by Kent Dybvig for more details; this is the "stack-based" model. * libguile/vm-engine.c: * libguile/vm-engine.h: Add the necessary infrastructure to keep track of a "closure" variable, like our "externals" in semantics, but minimal, flat, and O(1) in implementation.
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