55 lines
1.2 KiB
Ruby
55 lines
1.2 KiB
Ruby
module Risc
|
|
|
|
# A branch must branch to a label.
|
|
# Different Branches (derived classes) use different registers, the base
|
|
# just stores the Label
|
|
class Branch < Instruction
|
|
def initialize( source , label )
|
|
super(source)
|
|
@label = label
|
|
end
|
|
attr_reader :label
|
|
|
|
def to_s
|
|
case label
|
|
when Label
|
|
str = label.name
|
|
when Parfait::BinaryCode
|
|
str = "Code"
|
|
else
|
|
str = "(no label)"
|
|
end
|
|
class_source( str )
|
|
end
|
|
alias :inspect :to_s
|
|
|
|
end
|
|
|
|
# dynamic version of an Branch branch that jumps to the contents
|
|
# of a register instead of a hardcoded address
|
|
# As Branches jump to Labels, this is not derived from Branch
|
|
# PS: to conditionally jump to a dynamic adddress we do a normal branch
|
|
# over the dynamic one and then a dynamic one. Save us having all types of branches
|
|
# in two versions
|
|
class DynamicJump < Instruction
|
|
def initialize( source , register )
|
|
super(source)
|
|
@register = register
|
|
end
|
|
attr_reader :register
|
|
end
|
|
|
|
class IsZero < Branch
|
|
end
|
|
|
|
class IsNotZero < Branch
|
|
end
|
|
|
|
class IsMinus < Branch
|
|
end
|
|
|
|
class IsPlus < Branch
|
|
end
|
|
|
|
end
|