class code went

This commit is contained in:
Torsten Ruger 2014-09-17 16:32:21 +03:00
parent e7f7f9c319
commit 4af93493fb

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module Register
# Base class for anything that we can assemble
# Derived classes include instructions and constants(data)
# The commonality abstracted here is the length and position
# and the ability to assemble itself into the stream(io)
# All code is position independant once assembled.
# But for jumps and calls two passes are neccessary.
# The first setting the position, the second assembling
class Bode
def class_for clazz
RegisterMachine.instance.class_for(clazz)
end
# set the position to zero, will have to reset later
def initialize
@position = 0
end
# the position in the stream. Think of it as an address if you want. The difference is small.
# Especially since we produce _only_ position independant code
# in other words, during assembly the position _must_ be resolved into a pc relative address
# and not used as is
def position
@position
end
# The containing class (assembler/function) call this to tell the instruction/data where it is in the
# stream. During assembly the position is then used to calculate pc relative addresses.
def link_at address , context
@position = address
end
# length for this code in bytes
def mem_length
raise "Not implemented #{inspect}"
end
# we pass the io (usually string_io) in for the code to assemble itself.
def assemble(io)
raise "Not implemented #{self.inspect}"
end
end
end