125 lines
5.0 KiB
Ruby
125 lines
5.0 KiB
Ruby
module Sol
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# Sending in a dynamic language is off course not as simple as just calling.
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# The function that needs to be called depends after all on the receiver,
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# and no guarantees can be made on what that is.
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#
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# It helps to know that usually (>99%) the class of the receiver does not change.
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# Our stategy then is to cache the functions and only dynamically determine it in
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# case of a miss (the 1%, and first invocation)
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#
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# As cache key we must use the type of the object (which is the first word of _every_ object)
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# as that is constant, and function implementations depend on the type (not class)
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class SendStatement < CallStatement
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def block
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return nil if arguments.empty?
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bl = arguments.last
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bl.is_a?(LambdaExpression) ? bl : nil
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end
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def add_block( block )
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@arguments << block
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end
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def each(&block)
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super
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self.block.each(&block) if self.block
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end
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# lazy init this, to keep the dependency (which goes to parfait and booting) at bay
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def dynamic_call
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@dynamic ||= SlotMachine::DynamicCall.new()
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end
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# A Send breaks down to 2 steps:
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# - Setting up the next message, with receiver, arguments, and (importantly) return address
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# - a CachedCall , or a SimpleCall, depending on wether the receiver type can be determined
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#
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# A slight complication occurs for methods defined in superclasses. Since we are
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# type, not class, based, these are not part of our type.
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# So we check, and if find, add the source (sol_method) to the class and start
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# compiling the sol for the receiver_type
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#
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def to_slot( compiler )
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@receiver = SelfExpression.new(compiler.receiver_type) if @receiver.is_a?(SelfExpression)
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if(@receiver.ct_type)
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method = @receiver.ct_type.get_method(@name)
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#puts "Known #{@receiver.ct_type}: method #{method}"
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method = create_method_from_source(compiler) unless( method )
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return simple_call(compiler, method) if method
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end
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cached_call(compiler)
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end
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# If a method is found in the class (not the type)
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# we add it to the class that the receiver type represents, and create a compiler
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# to compile the sol for the specific type (the receiver)
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def create_method_from_source(compiler)
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sol_method = @receiver.ct_type.object_class.resolve_method!(@name)
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return nil unless sol_method
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#puts "#{sol_method.name} , adding to #{@receiver.ct_type.object_class.name}"
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@receiver.ct_type.object_class.add_instance_method(sol_method)
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sol_method.create_callable_method_for(@receiver.ct_type)
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new_compiler = sol_method.compiler_for(@receiver.ct_type)
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compiler.add_method_compiler(new_compiler)
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new_compiler.callable
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end
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def message_setup(compiler,called_method)
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setup = SlotMachine::MessageSetup.new( called_method )
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slot_receive = @receiver.to_slot_definition(compiler)
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arg_target = [:message , :next_message ]
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args = []
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@arguments.each_with_index do |arg , index| # +1 because of type
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args << SlotMachine::SlotLoad.new(self, arg_target + ["arg#{index+1}".to_sym] , arg.to_slot_definition(compiler))
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end
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setup << SlotMachine::ArgumentTransfer.new(self, slot_receive , args )
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end
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def simple_call(compiler, called_method)
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message_setup(compiler,called_method) << SlotMachine::SimpleCall.new(called_method)
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end
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# this breaks cleanly into two parts:
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# - check the cached type and if neccessary update
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# - call the cached method
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def cached_call(compiler)
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cache_check(compiler) << call_cached_method(compiler)
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end
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# check that current type is the cached type
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# if not, change and find method for the type (simple_call to resolve_method)
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# conceptually easy in ruby, but we have to compile that "easy" ruby
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def cache_check(compiler)
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ok = SlotMachine::Label.new(self,"cache_ok_#{self.object_id}")
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check = build_condition(ok, compiler) # if cached_type != current_type
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check << SlotMachine::SlotLoad.new(self,[dynamic_call.cache_entry, :cached_type] , receiver_type_definition(compiler))
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check << SlotMachine::ResolveMethod.new(self, @name , dynamic_call.cache_entry )
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check << ok
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end
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# to call the method (that we know now to be in the cache), we move the method
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# to reg1, do the setup (very similar to static) and call
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def call_cached_method(compiler)
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message_setup(compiler,dynamic_call.cache_entry) << dynamic_call
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end
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def to_s(depth = 0)
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sen = "#{receiver}.#{name}(#{@arguments.collect{|a| a.to_s}.join(', ')})"
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at_depth(depth , sen)
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end
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private
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def receiver_type_definition(compiler)
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defi = @receiver.to_slot_definition(compiler)
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defi.slots << :type
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defi
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end
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def build_condition(ok_label, compiler)
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cached_type = SlotMachine::SlotDefinition.for(dynamic_call.cache_entry , [:cached_type])
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current_type = receiver_type_definition(compiler)
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SlotMachine::NotSameCheck.new(cached_type , current_type, ok_label)
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end
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end
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end
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