44 lines
980 B
Ruby
44 lines
980 B
Ruby
|
module Asm
|
||
|
|
ERRSTR_NUMERIC_TOO_LARGE = 'cannot fit numeric literal argument in operand'
|
||
|
|
ERRSTR_INVALID_ARG = 'invalid operand argument'
|
||
|
|
|
||
|
|
class Assembler
|
||
|
|
def initialize
|
||
|
|
@objects = []
|
||
|
|
@label_objects = []
|
||
|
|
@label_callbacks = []
|
||
|
|
@relocations = []
|
||
|
|
end
|
||
|
|
attr_reader :relocations, :objects
|
||
|
|
|
||
|
|
def add_object(obj)
|
||
|
|
@objects << obj
|
||
|
|
end
|
||
|
|
|
||
|
|
def add_relocation(*args)
|
||
|
|
@relocations << Asm::Relocation.new(*args)
|
||
|
|
end
|
||
|
|
|
||
|
|
def register_label_callback(label, io_pos, &block)
|
||
|
|
@label_callbacks << [label, io_pos, block]
|
||
|
|
end
|
||
|
|
|
||
|
|
def assemble(io)
|
||
|
|
@objects.each do |obj|
|
||
|
|
obj.assemble io, self
|
||
|
|
end
|
||
|
|
|
||
|
|
@relocations.delete_if do |reloc|
|
||
|
|
io.seek reloc.position
|
||
|
|
if (reloc.label.extern?)
|
||
|
|
reloc.handler.call(io, io.tell, reloc.type)
|
||
|
|
else
|
||
|
|
reloc.handler.call(io, reloc.label.address, reloc.type)
|
||
|
|
end
|
||
|
|
not reloc.label.extern?
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|