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lisp-cheney
A mini Lisp in 1k lines of C with Cheney's copying garbage collector, explained. Includes over 40 built-in Lisp primitives, floating point, strings, closures with lexical scope, macros, proper tail recursion, exceptions, execution tracing, file loading, a copying garbage collector and REPL.
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lisp
A mini Lisp in 1k lines of C with garbage collector, explained. Includes over 40 built-in Lisp primitives, floating point, strings, closures with lexical scope, macros, proper tail recursion, exceptions, execution tracing, file loading, a mark-sweep/compacting garbage collector and REPL. (by Robert-van-Engelen)
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A mini Lisp with Cheney GC
A mini Lisp with mark-sweep GC
I'm currently implementing Immix in SBCL (got generations working yesterday), but I wouldn't recommend one does that for a miniature implementation, as my implementation (though with hacks, performance tricks of dubious quality, and having to put the hysterical raisins somewhere) is about 1kLOC, and I haven't even gotten to writing compaction yet. A simple hybrid of mark-sweep and copying is the Lang-Dupont collector which copies one portion of the heap at a time, marking and reclaiming the rest in place.