Torsten
5b0c1195e4
Interpreter was not handling ssa correctly (ie overwriting) Resolve was assuming wrong registers (also non ssa) return value still broken
75 lines
2.4 KiB
Ruby
75 lines
2.4 KiB
Ruby
module SlotMachine
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# Dynamic method resolution is at the heart of a dynamic language, and here
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# is the SlotMachine level instruction to do it.
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#
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# When the static type can not be determined a CacheEntry is used to store
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# type and method of the resolved method. The CacheEntry is shared with
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# DynamicCall instruction who is responsible for calling the method in the entry.
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#
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# This instruction resolves the method, in case the types don't match (and
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# at least on first encouter)
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#
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# This used to be a method, but we don't really need the method setup etc
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#
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class ResolveMethod < Instruction
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attr :cache_entry , :name
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# pass in source (SolStatement)
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# name of the method (don't knwow the actaual method)
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# and the cache_entry
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def initialize(source , name , cache_entry)
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super(source)
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@name = name
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@cache_entry = cache_entry
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end
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def to_s
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"ResolveMethod #{name}"
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end
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# When the method is resolved, a cache_entry is used to hold the result.
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# That cache_entry (holding type and method) is checked before, and
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# needs to be updated by this instruction.
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#
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# We use the type stored in the cache_entry to check the methods if any of it's
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# names are the same as the given @name
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#
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# currently a fail results in sys exit
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def to_risc( compiler )
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builder = compiler.builder(self)
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word = builder.load_object(Parfait.new_word(@name.to_s))
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entry = builder.load_object(@cache_entry)
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while_start_label = Risc.label(to_s, "while_start_label_#{object_id}")
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ok_label = Risc.label(to_s, "ok_label_#{object_id}")
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exit_label = Risc.label(to_s, "exit_label_#{object_id}")
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builder.build do
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callable_method = entry[:cached_type][:methods].to_reg
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add_code while_start_label
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object = load_object Parfait.object_space.nil_object
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object.op :- , callable_method
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if_zero exit_label
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name = callable_method[:name].to_reg
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name.op :- , word
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if_zero ok_label
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next_method = callable_method[:next_callable].to_reg
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callable_method << next_method
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branch while_start_label
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add_code exit_label
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MethodMissing.new(compiler.source_name , word.symbol).to_risc(compiler)
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add_code ok_label
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entry[:cached_method] << callable_method
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end
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end
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end
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end
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