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Contents
module Ragweed; end
module Ragweed::Rasm
# Ruby inline assembler.
class Bblock
# Don't call this directly; use Bblock#make
def initialize
@insns = Ragweed::Rasm::Subprogram.new
end
# Wrap the methods of Rasm::Subprogram we care about:
# Assemble the instructions, which also calculates appropriate
# jump labels.
def assemble; @insns.assemble; end
# Disassemble the block (after it's been assembled) into
# Frasm objects.
def disassemble; @insns.disassemble; end
# Generate a human-readable assembly listing.
def listing; @insns.dump_disassembly; end
# Append more instructions to a previously created block;
# see Bblock#make
def append(&block)
instance_eval(&block)
end
# Takes a block argument, containing (mostly) assembly
# instructions, as interpreted by Rasm. For example:
#
# Bblock.make {
# push ebp
# mov ebp, esp
# push ebx
# xor ebx, ebx
# addl esp, 4
# pop ebp
# ret
# }
#
# Each of those instructions is in fact the name of a class
# in Rasm, lowercased; Bblock has a method_missing that catches
# and instantiates them.
#
# Your block can contain arbitrary Ruby, but remember that it
# runs in the scope of an anonymous class and so cannot directly
# reference instance variables.
def self.make(&block)
c = Bblock.new
c.instance_eval(&block)
c
end
# method to fix collision with Kernel#sub properly
def sub(*args)
Ragweed::Rasm::Sub.new(*args)
end
def method_missing(meth, *args)
k = Ragweed::Rasm.const_get(meth.to_s.capitalize)
# If it's a class, it's an assembly opcode; otherwise,
# it's a register or operand.
if k.class == Class
@insns << (k = k.new(*args))
else
k
end
k
end
end
end
Version data entries
25 entries across 25 versions & 2 rubygems