8d3a1954fa
Mostly replaced Fixnum with integer also in the rx-file dependency all travis and testing with 2.4+
243 lines
8.6 KiB
Ruby
243 lines
8.6 KiB
Ruby
module Risc
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# RegisterValue is like a variable name, a storage location.
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# The location is a register off course.
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# The type is always known, and sometimes the value too
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# Or something about the value, like some instances types
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#
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# When participating in the builder dsl, a builder may be set to get the
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# results of dsl operations (like <<) back to the builder
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class RegisterValue
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attr_reader :symbol , :type , :extra
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attr_reader :builder
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# The first arg is a symbol :r0 - :r12
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# Second arg is the type, which may be given as the symbol of the class name
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# (internally we store the actual type instance, resolving any symbols)
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# A third value may give extra information. This is a hash, where keys may
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# be :value, or :value_XX or :type_XX to indicate value or type information
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# for an XX instance
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def initialize( reg , type , extra = {})
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extra = {} unless extra
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raise "Not Hash #{extra}" unless extra.is_a?(Hash)
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raise "not reg #{reg}" unless self.class.look_like_reg( reg )
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raise "No type " unless type
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type = Parfait.object_space.get_type_by_class_name(type) if type.is_a?(Symbol)
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@type = type
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@symbol = reg
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@extra = extra
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end
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def class_name
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return :fixnum unless @type
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@type.class_name
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end
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# allows to set the builder, which is mainly done by the builder
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# but sometimes, eg in exit, one nneds to create the reg by hand and set
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# return the RegisterValue for chaining in assignment
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def set_builder( builder )
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@builder = builder
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self
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end
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# using the registers type, resolve the slot to an index
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# Using the index and the register, add a SlotToReg to the instruction
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def resolve_and_add(slot , compiler)
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index = resolve_index( slot )
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new_left = get_new_left( slot , compiler )
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compiler.add_code Risc::SlotToReg.new( "SlotLoad #{type}[#{slot}]" , self ,index, new_left)
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new_left
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end
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# resolve the given slot name (instance variable name) to an index using the type
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# RegisterValue has the current type, so we just look up the index in the type
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def resolve_index(slot)
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#puts "TYPE #{type} obj:#{object} var:#{slot} comp:#{compiler}"
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index = type.variable_index(slot)
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raise "Index not found for #{slot} in #{type} of type #{@type}" unless index
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return index
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end
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# reduce integer to fixnum and add instruction if builder is used
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def reduce_int
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reduce = Risc.slot_to_reg( "int -> fix" , self , Parfait::Integer.integer_index , self)
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builder.add_code(reduce) if builder
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reduce
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end
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# when following variables in resolve_and_add, get a new RegisterValue
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# that represents the new value.
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# Ie in "normal case" a the same register, with the type of the slot
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# (the not normal case, the first reduction, uses a new register, as we don't
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# overwrite the message)
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# We get the type with resolve_new_type
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def get_new_left(slot, compiler)
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new_type = extra["type_#{slot}".to_sym]
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new_type , extra = compiler.slot_type(slot , type) unless new_type
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if( @symbol == :r0 )
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new_left = compiler.use_reg( new_type , extra)
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else
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new_left = RegisterValue.new( @symbol , new_type , extra)
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end
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new_left
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end
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def to_s
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s = "#{symbol}:#{class_name}"
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s += ":#{extra}" unless extra.empty?
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s
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end
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def reg_no
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@symbol.to_s[1 .. -1].to_i
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end
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def self.look_like_reg is_it
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return true if is_it.is_a? RegisterValue
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return false unless is_it.is_a? Symbol
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if( [:lr , :pc].include? is_it )
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return true
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end
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if( (is_it.to_s.length <= 3) and (is_it.to_s[0] == "r"))
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# could tighten this by checking that the rest is a number
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return true
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end
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return false
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end
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def == other
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return false if other.nil?
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return false if other.class != RegisterValue
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symbol == other.symbol
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end
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#helper method to calculate with register symbols
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def next_reg_use( type , extra = {} )
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int = @symbol[1,3].to_i
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raise "No more registers #{self}" if int > 11
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sym = "r#{int + 1}".to_sym
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RegisterValue.new( sym , type, extra)
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end
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def rxf_reference_name
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@symbol
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end
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# can't overload "=" , so use shift for it.
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# move the right side to the left. Left (this) is a RegisterValue
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# right value may be
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# - constant (Parfait object) , resulting in a LoadConstant
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# - another RegisterValue, resulting in a Transfer instruction
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# - an RValue, resulting in an SlotToReg
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def <<( right )
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case right
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when Symbol
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ins = Risc.load_constant("#{right.class} to #{self.type}" , right , self)
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when Parfait::Object
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ins = Risc.load_constant("#{right.class} to #{self.type}" , right , self)
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builder.compiler.add_constant(right) if builder
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when Label
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ins = Risc.load_constant("#{right.class} to #{self.type}" , right , self)
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builder.compiler.add_constant(right.address) if builder
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when ::Integer
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ins = Risc.load_data("#{right.class} to #{self.type}" , right , self)
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when RegisterValue
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ins = Risc.transfer("#{right.type} to #{self.type}" , right , self)
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when RValue
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ins = Risc.slot_to_reg("#{right.register.type}[#{right.index}] -> #{self.type}" , right.register , right.index , self)
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else
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raise "not implemented for #{right.class}:#{right}"
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end
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builder.add_code(ins) if builder
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return ins
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end
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# similar to above (<< which produces slot_to_reg), this produces byte_to_reg
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# since << covers all other cases, this must have a RValue as the right
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def <=( right )
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raise "not implemented for #{right.class}:#{right}" unless right.is_a?( RValue )
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ins = Risc.byte_to_reg("#{right.register.type}[#{right.index}] -> #{self.type}" , right.register , right.index , self)
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builder.add_code(ins) if builder
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return ins
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end
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def -( right )
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raise "operators only on registers, not #{right.class}" unless right.is_a? RegisterValue
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op = Risc.op("#{self.type} - #{right.type}", :- , self , right )
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builder.add_code(op) if builder
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op
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end
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# generate a Function return instruction
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# using the register as the parameter where the return address is passed
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def function_return
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ret = Risc.function_return("return", self)
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builder.add_code(ret) if builder
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ret
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end
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# create operator instruction for self and add
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# doesn't read quite as smoothly as one would like, but better than the compiler version
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def op( operator , right)
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ret = Risc.op( "operator #{operator}" , operator , self , right)
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builder.add_code(ret) if builder
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ret
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end
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# just capture the values in an intermediary object (RValue)
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# The RValue then gets used in a RegToSlot ot SlotToReg, where
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# the values are unpacked to call Risc.reg_to_slot or Risc.slot_to_reg
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def []( index )
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RValue.new( self , index , builder)
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end
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end
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# Just a struct, see comment for [] of RegisterValue
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#
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class RValue
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attr_reader :register , :index , :builder
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def initialize(register, index , builder)
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@register , @index , @builder = register , index , builder
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end
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# fullfil the objects purpose by creating a RegToSlot instruction from
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# itself (the slot) and the register given
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def <<( reg )
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raise "not reg #{reg}" unless reg.is_a?(RegisterValue)
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reg_to_slot = Risc.reg_to_slot("#{reg.class_name} -> #{register.class_name}[#{index}]" , reg , register, index)
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builder.add_code(reg_to_slot) if builder
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reg_to_slot
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end
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# similar to above (<< which produces reg_to_slot), this produces reg_to_byte
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# from itself (the slot) and the register given
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def <=( reg )
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raise "not reg #{reg}" unless reg.is_a?(RegisterValue)
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reg_to_byte = Risc.reg_to_byte("#{reg.class_name} -> #{register.class_name}[#{index}]" , reg , register, index)
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builder.add_code(reg_to_byte) if builder
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reg_to_byte
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end
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end
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# The register we use to store the current message object is :r0
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def self.message_reg
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RegisterValue.new :r0 , :Message
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end
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# The register we use to store the new message object is :r3
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# The new message is the one being built, to be sent
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def self.new_message_reg
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RegisterValue.new :r1 , :Message
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end
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# The first scratch register. There is a next_reg_use to get a next and next.
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# Current thinking is that scratch is schatch between instructions
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def self.tmp_reg( type , extra = {})
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RegisterValue.new :r1 , type , extra
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end
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end
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