35 lines
1.3 KiB
Ruby
35 lines
1.3 KiB
Ruby
module Register
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# name says it all really
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# only arg is the method object we want to call
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# assembly takes care of the rest (ie getting the address)
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class FunctionCall < Instruction
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def initialize source , method
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super(source)
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@method = method
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end
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attr_reader :method
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def to_s
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"FunctionCall: #{method.name}"
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end
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end
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def self.issue_call( compiler , callee )
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source = "_issue_call(#{callee.name})"
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return_label = Label.new("_return_label" , "#{compiler.type.object_class.name}.#{compiler.method.name}" )
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ret_tmp = compiler.use_reg(:Label)
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compiler.add_code Register::LoadConstant.new(source, return_label , ret_tmp)
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compiler.add_code Register.reg_to_slot(source, ret_tmp , :new_message , :return_address)
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# move the current new_message to message
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compiler.add_code RegisterTransfer.new(source, Register.new_message_reg , Register.message_reg )
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# do the register call
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compiler.add_code FunctionCall.new( source , callee )
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compiler.add_code return_label
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# move the current message to new_message
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compiler.add_code Register::RegisterTransfer.new(source, Register.message_reg , Register.new_message_reg )
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# and restore the message from saved value in new_message
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compiler.add_code Register.slot_to_reg(source , :new_message , :caller , :message )
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end
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end
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