rubyx/lib/sol/assignment.rb
2020-02-15 21:05:04 +07:00

43 lines
1.4 KiB
Ruby

module Sol
# Base class for assignments (local/ivar), works just as you'd expect
# Only "quirk" maybe, that arguments are like locals
#
# Only actual functionality here is the compile_assign_call which compiles
# the call, should the assigned value be a call.
class Assignment < Statement
attr_reader :name , :value
def initialize(name , value )
raise "Name nil #{self}" unless name
raise "Value nil #{self}" unless value
raise "Value cant be Assignment #{value}" if value.is_a?(Assignment)
raise "Value cant be Statements #{value}" if value.is_a?(Statements)
@name , @value = name , value
end
def each(&block)
block.call(self)
@value.each(&block)
end
def to_s(depth = 0)
at_depth(depth , "#{@name} = #{@value}")
end
# The assign instruction (a slot_load) is produced by delegating the slot to derived
# class
#
# When the right hand side is a CallStatement, it must be compiled, before the assign
# is executed
#
# Derived classes do not implement to_slot, only slot_position
def to_slot(compiler)
to = SlotMachine::Slotted.for(:message , self.slot_position(compiler))
from = @value.to_slot_definition(compiler)
assign = SlotMachine::SlotLoad.new(self,to,from)
return assign unless @value.is_a?(CallStatement)
@value.to_slot(compiler) << assign
end
end
end