30 lines
833 B
Ruby
30 lines
833 B
Ruby
module Bosl
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Compiler.class_eval do
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def on_while expression
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#puts expression.inspect
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condition , expressions = *expression
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condition = condition.first
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# this is where the while ends and both branches meet
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merge = @method.source.new_block("while merge")
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# this comes after the current and beofre the merge
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start = @method.source.new_block("while_start" )
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@method.source.current start
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cond = process(condition)
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@method.source.add_code Register::IsZeroBranch.new(condition,merge)
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last = process_all(expressions).last
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# unconditionally branch to the start
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@method.source.add_code Register::AlwaysBranch.new(expression,start)
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# continue execution / compiling at the merge block
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@method.source.current merge
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last
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end
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end
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end
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