40 lines
1.7 KiB
Ruby
40 lines
1.7 KiB
Ruby
module Bosl
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module Compiler
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# operators are really function calls
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# call_site - attr_reader :name, :args , :receiver
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def self.compile_call expession , method
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name , arguments , receiver = *expession
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name = name.to_a.first
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if receiver
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me = Compiler.compile( receiver.to_a.first , method )
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else
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me = Virtual::Self.new
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end
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## need two step process, compile and save to frame
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# then move from frame to new message
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method.source.add_code Virtual::NewMessage.new
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method.source.add_code Virtual::Set.new( me , Virtual::NewSelf.new(me.type))
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method.source.add_code Virtual::Set.new( name.to_sym , Virtual::NewMessageName.new())
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compiled_args = []
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arguments.to_a.each_with_index do |arg , i|
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#compile in the running method, ie before passing control
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val = Compiler.compile( arg , method)
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# move the compiled value to it's slot in the new message
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# + 1 as this is a ruby 0-start , but 0 is the last message ivar.
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# so the next free is +1
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to = Virtual::NewArgSlot.new(i + 1 ,val.type , val)
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# (doing this immediately, not after the loop, so if it's a return it won't get overwritten)
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method.source.add_code Virtual::Set.new( val , to )
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compiled_args << to
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end
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method.source.add_code Virtual::MessageSend.new(name , me , compiled_args) #and pass control
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# the effect of the method is that the NewMessage Return slot will be filled, return it
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# (this is what is moved _inside_ above loop for such expressions that are calls (or constants))
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Virtual::Return.new( method.source.return_type )
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end
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end
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end
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