76 lines
2.5 KiB
Ruby
76 lines
2.5 KiB
Ruby
module Mom
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# CallableCompiler is used to generate mom instructions. It is an abstact base
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# class shared by BlockCompiler and MethodCompiler
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# - mom_instructions: The sequence of mom level instructions that mom was compiled to
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# Instructions derive from class Instruction and form a linked list
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class CallableCompiler
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include Util::CompilerList
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def initialize( callable )
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@callable = callable
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@constants = []
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@mom_instructions = Label.new(source_name, source_name)
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@current = start = @mom_instructions
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add_code Label.new( source_name, "return_label")
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add_code Mom::ReturnSequence.new(source_name)
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add_code Label.new( source_name, "unreachable")
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@current = start
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end
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attr_reader :mom_instructions , :constants , :callable , :current
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def return_label
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@mom_instructions.each do |ins|
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next unless ins.is_a?(Label)
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return ins if ins.name == "return_label"
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end
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end
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# add a constant (which get created during compilation and need to be linked)
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def add_constant(const)
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raise "Must be Parfait #{const}" unless const.is_a?(Parfait::Object)
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@constants << const
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end
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# translate to Risc, ie a Risc level CallableCompiler
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# abstract functon that needs to be implemented by Method/BlockCompiler
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def to_risc
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raise "abstract in #{self.class}"
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end
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# add a risc instruction after the current (insertion point)
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# the added instruction will become the new insertion point
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def add_code( instruction )
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raise "Not an instruction:#{instruction.to_s}:#{instruction.class.name}" unless instruction.is_a?(Mom::Instruction)
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new_current = instruction.last #after insertion this point is lost
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@current.insert(instruction) #insert after current
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@current = new_current
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self
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end
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# return the frame type, ie the blocks self_type
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def receiver_type
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@callable.self_type
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end
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private
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# convert al instruction to risc
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# method is called by Method/BlockCompiler from to_risc
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def instructions_to_risc(risc_compiler)
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instruction = mom_instructions.next
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while( instruction )
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raise "whats this a #{instruction}" unless instruction.is_a?(Mom::Instruction)
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#puts "adding mom #{instruction.to_s}:#{instruction.next.to_s}"
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risc_compiler.reset_regs
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instruction.to_risc( risc_compiler )
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#puts "adding risc #{risc.to_s}:#{risc.next.to_s}"
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instruction = instruction.next
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end
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end
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end
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end
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