53 lines
1.4 KiB
Ruby
53 lines
1.4 KiB
Ruby
module Vm
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# collection of the simple ones, int and strings and such
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module BasicValues
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# Constant expressions can by definition be evaluated at compile time.
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# But that does not solve their storage, ie they need to be accessible at runtime from _somewhere_
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# So expressions move the data into a Risc.
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# All expressions return registers
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# But in the future (in the one that holds great things) we optimize those unneccesay moves away
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def on_IntegerExpression expression
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int = expression.value
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reg = use_reg :Integer , int
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add_load_constant( expression, int , reg )
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return reg
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end
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def on_TrueExpression expression
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reg = use_reg :Boolean
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add_load_constant( expression, true , reg )
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return reg
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end
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def on_FalseExpression expression
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reg = use_reg :Boolean
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add_load_constant( expression, false , reg )
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return reg
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end
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def on_NilExpression expression
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reg = use_reg :NilClass
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add_load_constant( expression, nil , reg )
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return reg
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end
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def on_StringExpression expression
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value = Parfait.new_word expression.value.to_sym
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reg = use_reg :Word
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Risc.machine.constants << value
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add_load_constant( expression, value , reg )
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return reg
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end
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def on_ClassExpression expression
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name = expression.value
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raise "No meta class #{name}"
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end
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end
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end
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