16 lines
721 B
Factor
16 lines
721 B
Factor
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USING: help.markup help.syntax sequences strings ;
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IN: compiler.cfg.stacks.vacant
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ARTICLE: "compiler.cfg.stacks.vacant" "Uninitialized/overinitialized stack location analysis"
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"Consider the following sequence of instructions:"
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{ $code
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"##inc-d 2"
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"..."
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"##allot"
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"##replace ... D 0"
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"##replace ... D 1"
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}
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"The GC check runs before stack locations 0 and 1 have been initialized, and so the GC needs to scrub them so that they don't get traced. This is achieved by computing uninitialized locations with a dataflow analysis, and recording the information in GC maps. The scrub_contexts() method on vm/gc.cpp reads this information from GC maps and performs the scrubbing." ;
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ABOUT: "compiler.cfg.stacks.vacant"
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