34 lines
1.0 KiB
Ruby
34 lines
1.0 KiB
Ruby
module Register
|
|
|
|
# RegisterReference is not the name for a register, "only" for a certain use of it.
|
|
# In a way it is like a variable name, a storage location. The location is a register off course,
|
|
# but which register can be changed, and _all_ instructions sharing the RegisterReference then use that register
|
|
# In other words a simple level of indirection, or change from value to reference sematics.
|
|
|
|
class RegisterReference
|
|
attr_accessor :symbol
|
|
def initialize r
|
|
if( r.is_a? Fixnum)
|
|
r = "r#{r}".to_sym
|
|
end
|
|
raise "wrong type for register init #{r}" unless r.is_a? Symbol
|
|
raise "double r #{r}" if r == :rr1
|
|
@symbol = r
|
|
end
|
|
|
|
def == other
|
|
return false if other.nil?
|
|
return false if other.class != RegisterReference
|
|
symbol == other.symbol
|
|
end
|
|
|
|
#helper method to calculate with register symbols
|
|
def next_reg_use by = 1
|
|
int = @symbol[1,3].to_i
|
|
sym = "r#{int + by}".to_sym
|
|
RegisterReference.new( sym )
|
|
end
|
|
end
|
|
|
|
end
|