34 lines
1.5 KiB
Factor
34 lines
1.5 KiB
Factor
USING: compiler.cfg compiler.cfg.registers help.markup help.syntax ;
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IN: compiler.cfg.stacks.local
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HELP: current-height
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{ $class-description "A tuple used to keep track of the heights of the data and retain stacks in a " { $link basic-block } " The idea is that if the stack change instructions are tracked, then multiple changes can be folded into one. It has the following slots:"
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{ $table
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{ { $slot "d" } { "Current datastack height." } }
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{ { $slot "r" } { "Current retainstack height." } }
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{ { $slot "emit-d" } { "Queued up datastack height change." } }
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{ { $slot "emit-r" } { "Queued up retainstack height change." } }
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}
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} ;
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HELP: translate-local-loc
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{ $values { "loc" loc } { "loc'" loc } }
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{ $description "Translates an absolute stack location to one that is relative to the current stacks height as given in " { $link current-height } "." }
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{ $examples
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{ $example
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"USING: compiler.cfg.stacks.local compiler.cfg.registers namespaces prettyprint ;"
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"T{ current-height { d 3 } } current-height set D 7 translate-local-loc ."
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"D 4"
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}
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} ;
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HELP: emit-height-changes
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{ $description "Emits stack height change instructions to the CFG being built. This is done when a " { $link basic-block } " is begun or ended." }
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{ $examples
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{ $example
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"USING: compiler.cfg.stacks.local make namespaces prettyprint ;"
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"T{ current-height { emit-d 4 } { emit-r -2 } } current-height set [ emit-height-changes ] { } make ."
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"{ T{ ##inc-d { n 4 } } T{ ##inc-r { n -2 } } }"
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}
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} ;
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