Class: Ragweed::Rasm::Jcc

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

Overview

Wrapper for conditional jumps, see below

Direct Known Subclasses

Ja, Jae, Jb, Jbe, Jc, Je, Jg, Jge, Jl, Jle, Jna, Jnae, Jnb, Jnbe, Jnc, Jne, Jng, Jnge, Jnl, Jnle, Jno, Jnp, Jns, Jnz, Jo, Jp, Jpe, Jpo, Js, Jz

Instance Attribute Summary

Attributes inherited from Instruction

#dst, #src

Instance Method Summary collapse

Methods inherited from Instruction

#add, #coerce, #dst_imm?, #dst_lab?, #dst_reg?, i, #locate, #modrm, #patch, #sib, #src_imm?, #src_lab?, #src_reg?

Constructor Details

#initialize(dst) ⇒ Jcc

Returns a new instance of Jcc.



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# File 'lib/ragweed/rasm/isa.rb', line 954

def initialize( dst)
  super dst
  @short, @near = m()
end

Instance Method Details

#m ⇒ Object 



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# File 'lib/ragweed/rasm/isa.rb', line 953

def m; [nil,nil]; end

#to_s ⇒ Object

Raises:



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# File 'lib/ragweed/rasm/isa.rb', line 959

def to_s
  raise Insuff if not @dst
  raise(BadArg, "need immed") if not dst_imm? and not dst_lab?

  if @dst.val < 0
    if @dst.val.abs & 0x80
      add(0x0f)
      add(@near)
      add(@dst.sx32)
    else
      add(@short)
      add(@dst.sx8)
    end
  else
    if @dst.val < 0x100
      add(@short)
      add(@dst.val)
    else
      add(0x0f)
      add(@near)
      add(@dst.val, true)
    end
  end
  super
end