Class: Ragweed::Rasm::Subprogram

Inherits:
Array show all
Defined in:
lib/ragweed/rasm/isa.rb

Overview

A code fragment. Push instructions into it. You can push Label objects to create jump targets.

Instance Method Summary collapse

Methods included from Array::ArrayExtensions

#to_hash

Instance Method Details

#assemble ⇒ Object

Patch code offsets into the instructions to replace abstract labels. Produces raw instruction stream.



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# File 'lib/ragweed/rasm/isa.rb', line 175

def assemble
  patches = {}
  buf = Ragweed::Sbuf.new

  each do |i|
    if i.kind_of? Instruction
      i.locate(buf.size)
      buf.straw i.to_s
    else
      patches[i] = buf.size
    end
  end

  select {|i| i.kind_of? Instruction}.each {|i| i.patch(patches)}
  buf.clear!
  select {|i| i.kind_of? Instruction}.each {|i|
    buf.straw(i.to_s)
  }

  buf.content
end

#disassemble ⇒ Object

Produce an array of insns. This is pretty much broken, because it doesn’t pre-patch the instructions.



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# File 'lib/ragweed/rasm/isa.rb', line 199

def disassemble
  select {|i| i.kind_of? Ragweed::Rasm::Instruction}.map {|i| i.decode}
end

#dump_disassembly ⇒ Object 



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# File 'lib/ragweed/rasm/isa.rb', line 203

def dump_disassembly
  disassemble.each_with_index do |insn, i|
    puts "#{ i } #{ insn.mnem }"
  end
end