Class: GBRb::CPU::Instruction

Inherits:

Object

• Object
• GBRb::CPU::Instruction

Defined in:

lib/gbrb/cpu/instruction.rb

Direct Known Subclasses

AddHl, Arithmetic, Bit, Boolean, Call, Ccf, Cpl, Dec, DisableInterrupts, EnableInterrupts, Inc, Jump, Ld, Ldhlsp, Pop, Push, Res, Ret, Rl, Rr, Rst, Scf, Set, Stop, Swap

Instance Attribute Summary

• #i ⇒ Object readonly

  Returns the value of attribute i.

• #m ⇒ Object readonly

  Returns the value of attribute m.

• #t ⇒ Object readonly

  Returns the value of attribute t.

Instance Method Summary

• #call(r, mem) ⇒ Object
• #carry?(left, right, mask) ⇒ Boolean
• #immediate_count ⇒ Object
• #initialize(m = 1, t = 4, immediates = 0, *extra) ⇒ Instruction constructor

  A new instance of Instruction.

Constructor Details

#initialize(m = 1, t = 4, immediates = 0, *extra) ⇒ Instruction

Returns a new instance of Instruction.

# File 'lib/gbrb/cpu/instruction.rb', line 7

def initialize m=1, t=4, immediates=0, *extra
  @m = m
  @t = t
  @immediates = immediates
end

Instance Attribute Details

#i ⇒ Object (readonly)

Returns the value of attribute i.

# File 'lib/gbrb/cpu/instruction.rb', line 5

def i
  @i
end

#m ⇒ Object (readonly)

Returns the value of attribute m.

# File 'lib/gbrb/cpu/instruction.rb', line 5

def m
  @m
end

#t ⇒ Object (readonly)

Returns the value of attribute t.

# File 'lib/gbrb/cpu/instruction.rb', line 5

def t
  @t
end

Instance Method Details

#call(r, mem) ⇒ Object

# File 'lib/gbrb/cpu/instruction.rb', line 17

def call r, mem
  nil
end

#carry?(left, right, mask) ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/gbrb/cpu/instruction.rb', line 21

def carry? left, right, mask
  (mask-1 & left).public_send(@op, mask-1 & right) & mask == mask
end

#immediate_count ⇒ Object

# File 'lib/gbrb/cpu/instruction.rb', line 13

def immediate_count
  @immediates
end