81 lines
2.0 KiB
Ruby
81 lines
2.0 KiB
Ruby
require_relative "object"
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module Virtual
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# Instruction is an abstract for all the code of the object-machine. Derived classe make up the actual functionality
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# of the machine.
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# All functions on the machine are captured as instances of instructions
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#
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# It is actully the point of the virtual machine layer to express oo functionality in the set of instructions, thus
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# defining a minimal set of instructions needed to implement oo.
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# This is partly because jumping over this layer and doing in straight in assember was too big a step
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class Instruction < Virtual::Object
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attr_accessor :next
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def attributes
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[:next]
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end
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def initialize nex = nil
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@next = nex
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end
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def type
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Reference
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end
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end
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# the first instruction we need is to stop. Off course in a real machine this would be a syscall, but that is just
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# an implementation (in a programm it would be a function). But in a virtual machine, not only do we need this instruction,
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# it is indeed the first instruction as just this instruction is the smallest possible programm for the machine.
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# As such it is the next instruction for any first instruction that we generate.
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class Halt < Instruction
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end
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# following classes are stubs. currently in brainstorming mode, so anything may change anytime
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class MethodEnter < Instruction
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end
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class FrameGet < Instruction
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def initialize name
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@name = name
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end
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attr_reader :name
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def attributes
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[:name]
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end
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end
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class FrameSend < Instruction
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def initialize name , args = []
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@name = name.to_sym
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@args = args
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end
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attr_reader :name , :args
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def attributes
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[:name , :args]
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end
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end
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class FrameSet < Instruction
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def initialize name , val
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@name = name.to_sym
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@value = val
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end
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attr_reader :name , :value
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def attributes
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[:name , :value]
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end
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end
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class ObjectGet < Instruction
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def initialize name
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@name = name
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end
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attr_reader :name
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def attributes
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[:name]
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end
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end
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end
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