45 lines
1.7 KiB
Ruby
45 lines
1.7 KiB
Ruby
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module Register
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# This implements setting of the various slot variables the vm defines.
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class SetImplementation
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def run block
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block.codes.dup.each do |code|
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next unless code.is_a? Virtual::Set
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# need a temporay place because of indexed load/store
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tmp = Register.tmp_reg
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# for constants we have to "move" the constants value
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if( code.from.is_a?(Parfait::Value) or code.from.is_a?(Symbol) or code.from.is_a?(Fixnum) )
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move1 = LoadConstant.new(code, code.from , tmp )
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else # while otherwise we "load"
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puts "from #{code.from}"
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move1 = Register.get_slot(code, code.from.object_name , get_index(code.from) , tmp )
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end
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#puts "to #{code.to}"
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move2 = Register.set_slot( code , tmp , code.to.object_name , get_index(code.to) )
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block.replace(code , [move1,move2] )
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end
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end
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def get_index from
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case from
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when Virtual::Self , Virtual::NewSelf
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return Register.resolve_index( :message , :receiver)
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when Virtual::MessageName , Virtual::NewMessageName
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return Register.resolve_index( :message , :name)
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when Virtual::Return
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return Register.resolve_index( :message , :return_value)
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when Virtual::ArgSlot , Virtual::NewArgSlot
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#puts "from: #{from.index}"
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return Register.resolve_index( :message , :name) + from.index
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when Virtual::FrameSlot
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#puts "from: #{from.index}"
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return Register.resolve_index( :frame , :next_frame) + from.index
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else
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raise "not implemented for #{from.class}"
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end
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end
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end
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Virtual.machine.add_pass "Register::SetImplementation"
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end
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