rubyx/lib/slot_machine/macro/comparison.rb

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module SlotMachine
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class Comparison < Macro
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attr_reader :operator
def initialize(name , operator)
super(name)
#TODO check operator to be in valid range
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@operator = operator.value
end
# basically use subtract to subtract left from right (or right from left)
# and load true_object in the true branch and false_object in the false
# for the case of =, as in <= or >= we also do not check for zero
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def to_risc(compiler)
builder = compiler.builder(compiler.source)
operator = @operator # make accessible in block
false_label = Risc.label("false" , "false_label_#{object_id}")
merge_label = Risc.label("merge" , "merge_label_#{object_id}")
result = Risc::RegisterValue.new(:result , :Object)
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builder.build do
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left = message[:receiver].to_reg.reduce_int(false) #false == hack
right = message[:arg1].to_reg.reduce_int(false)
if(operator.to_s.start_with?('<') )
right.op :- , left
else
left.op :- , right
end
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if_minus false_label
if_not_zero( false_label ) if operator.to_s.length == 1
add_code Risc::LoadConstant.new(to_s , Parfait.object_space.true_object, result)
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branch merge_label
add_code false_label
add_code Risc::LoadConstant.new(to_s , Parfait.object_space.false_object, result)
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add_code merge_label
message[:return_value] << result
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end
return compiler
end
end
end