Class: Badline::Instruction

Inherits:
Object
  • Object
show all
Defined in:
lib/badline/instruction.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, addressing_mode, illegal: false, boundary_cycle: false) ⇒ Instruction

Returns a new instance of Instruction.



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# File 'lib/badline/instruction.rb', line 7

def initialize(name, addressing_mode,
               illegal: false, boundary_cycle: false)
  @name = name
  @addressing_mode = addressing_mode
  @boundary_cycle = boundary_cycle
  @illegal = illegal
  @operand_length = compute_operand_length
end

Instance Attribute Details

#addressing_mode ⇒ Object (readonly)

Returns the value of attribute addressing_mode.



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# File 'lib/badline/instruction.rb', line 5

def addressing_mode
  @addressing_mode
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/badline/instruction.rb', line 5

def name
  @name
end

#operand_length ⇒ Object (readonly)

Returns the value of attribute operand_length.



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# File 'lib/badline/instruction.rb', line 5

def operand_length
  @operand_length
end

Class Method Details

.find(opcode) ⇒ Object 



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# File 'lib/badline/instruction.rb', line 293

def find(opcode)
  table[opcode.to_i]
end

.map ⇒ Object 



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# File 'lib/badline/instruction.rb', line 17

def map
  @map ||= {
    0x00 => new(:brk, :implied),
    0x01 => new(:ora, :indirect_x),
    0x02 => new(:jam, :implied, illegal: true),
    0x03 => new(:slo, :indirect_x, illegal: true),
    0x04 => new(:nop, :zeropage, illegal: true),
    0x05 => new(:ora, :zeropage),
    0x06 => new(:asl, :zeropage),
    0x07 => new(:slo, :zeropage, illegal: true),
    0x08 => new(:php, :implied),
    0x09 => new(:ora, :immediate),
    0x0a => new(:asl, :accumulator),
    0x0b => new(:anc, :immediate, illegal: true),
    0x0c => new(:nop, :absolute, illegal: true),
    0x0d => new(:ora, :absolute),
    0x0e => new(:asl, :absolute),
    0x0f => new(:slo, :absolute, illegal: true),

    0x10 => new(:bpl, :relative),
    0x11 => new(:ora, :indirect_y, boundary_cycle: true),
    0x12 => new(:jam, :implied, illegal: true),
    0x13 => new(:slo, :indirect_y, illegal: true),
    0x14 => new(:nop, :zeropage_x, illegal: true),
    0x15 => new(:ora, :zeropage_x),
    0x16 => new(:asl, :zeropage_x),
    0x17 => new(:slo, :zeropage_x, illegal: true),
    0x18 => new(:clc, :implied),
    0x19 => new(:ora, :absolute_y, boundary_cycle: true),
    0x1a => new(:nop, :implied, illegal: true),
    0x1b => new(:slo, :absolute_y, illegal: true),
    0x1c => new(:nop, :absolute_x, boundary_cycle: true, illegal: true),
    0x1d => new(:ora, :absolute_x, boundary_cycle: true),
    0x1e => new(:asl, :absolute_x),
    0x1f => new(:slo, :absolute_x, illegal: true),

    0x20 => new(:jsr, :absolute),
    0x21 => new(:and, :indirect_x),
    0x22 => new(:jam, :implied, illegal: true),
    0x23 => new(:rla, :indirect_x, illegal: true),
    0x24 => new(:bit, :zeropage),
    0x25 => new(:and, :zeropage),
    0x26 => new(:rol, :zeropage),
    0x27 => new(:rla, :zeropage, illegal: true),
    0x28 => new(:plp, :implied),
    0x29 => new(:and, :immediate),
    0x2a => new(:rol, :accumulator),
    0x2b => new(:anc, :immediate, illegal: true),
    0x2c => new(:bit, :absolute),
    0x2d => new(:and, :absolute),
    0x2e => new(:rol, :absolute),
    0x2f => new(:rla, :absolute, illegal: true),

    0x30 => new(:bmi, :relative),
    0x31 => new(:and, :indirect_y, boundary_cycle: true),
    0x32 => new(:jam, :implied, illegal: true),
    0x33 => new(:rla, :indirect_y, illegal: true),
    0x34 => new(:nop, :zeropage_x, illegal: true),
    0x35 => new(:and, :zeropage_x),
    0x36 => new(:rol, :zeropage_x),
    0x37 => new(:rla, :zeropage_x, illegal: true),
    0x38 => new(:sec, :implied),
    0x39 => new(:and, :absolute_y, boundary_cycle: true),
    0x3a => new(:nop, :implied, illegal: true),
    0x3b => new(:rla, :absolute_y, illegal: true),
    0x3c => new(:nop, :absolute_x, boundary_cycle: true, illegal: true),
    0x3d => new(:and, :absolute_x, boundary_cycle: true),
    0x3e => new(:rol, :absolute_x),
    0x3f => new(:rla, :absolute_x, illegal: true),

    0x40 => new(:rti, :implied),
    0x41 => new(:eor, :indirect_x),
    0x42 => new(:jam, :implied, illegal: true),
    0x43 => new(:sre, :indirect_x, illegal: true),
    0x44 => new(:nop, :zeropage, illegal: true),
    0x45 => new(:eor, :zeropage),
    0x46 => new(:lsr, :zeropage),
    0x47 => new(:sre, :zeropage, illegal: true),
    0x48 => new(:pha, :implied),
    0x49 => new(:eor, :immediate),
    0x4a => new(:lsr, :accumulator),
    0x4b => new(:alr, :immediate, illegal: true),
    0x4c => new(:jmp, :absolute),
    0x4d => new(:eor, :absolute),
    0x4e => new(:lsr, :absolute),
    0x4f => new(:sre, :absolute, illegal: true),

    0x50 => new(:bvc, :relative),
    0x51 => new(:eor, :indirect_y, boundary_cycle: true),
    0x52 => new(:jam, :implied, illegal: true),
    0x53 => new(:sre, :indirect_y, illegal: true),
    0x54 => new(:nop, :zeropage_x, illegal: true),
    0x55 => new(:eor, :zeropage_x),
    0x56 => new(:lsr, :zeropage_x),
    0x57 => new(:sre, :zeropage_x, illegal: true),
    0x58 => new(:cli, :implied),
    0x59 => new(:eor, :absolute_y, boundary_cycle: true),
    0x5a => new(:nop, :implied, illegal: true),
    0x5b => new(:sre, :absolute_y, illegal: true),
    0x5c => new(:nop, :absolute_x, boundary_cycle: true, illegal: true),
    0x5d => new(:eor, :absolute_x, boundary_cycle: true),
    0x5e => new(:lsr, :absolute_x),
    0x5f => new(:sre, :absolute_x, illegal: true),

    0x60 => new(:rts, :implied),
    0x61 => new(:adc, :indirect_x),
    0x62 => new(:jam, :implied, illegal: true),
    0x63 => new(:rra, :indirect_x, illegal: true),
    0x64 => new(:nop, :zeropage, illegal: true),
    0x65 => new(:adc, :zeropage),
    0x66 => new(:ror, :zeropage),
    0x67 => new(:rra, :zeropage, illegal: true),
    0x68 => new(:pla, :implied),
    0x69 => new(:adc, :immediate),
    0x6a => new(:ror, :accumulator),
    0x6b => new(:arr, :immediate, illegal: true),
    0x6c => new(:jmp, :indirect),
    0x6d => new(:adc, :absolute),
    0x6e => new(:ror, :absolute),
    0x6f => new(:rra, :absolute, illegal: true),

    0x70 => new(:bvs, :relative),
    0x71 => new(:adc, :indirect_y, boundary_cycle: true),
    0x72 => new(:jam, :implied, illegal: true),
    0x73 => new(:rra, :indirect_y, illegal: true),
    0x74 => new(:nop, :zeropage_x, illegal: true),
    0x75 => new(:adc, :zeropage_x),
    0x76 => new(:ror, :zeropage_x),
    0x77 => new(:rra, :zeropage_x, illegal: true),
    0x78 => new(:sei, :implied),
    0x79 => new(:adc, :absolute_y, boundary_cycle: true),
    0x7a => new(:nop, :implied, illegal: true),
    0x7b => new(:rra, :absolute_y, illegal: true),
    0x7c => new(:nop, :absolute_x, boundary_cycle: true, illegal: true),
    0x7d => new(:adc, :absolute_x, boundary_cycle: true),
    0x7e => new(:ror, :absolute_x),
    0x7f => new(:rra, :absolute_x, illegal: true),

    0x80 => new(:nop_nocycle, :immediate, illegal: true),
    0x81 => new(:sta, :indirect_x),
    0x82 => new(:nop_nocycle, :immediate, illegal: true),
    0x83 => new(:sax, :indirect_x, illegal: true),
    0x84 => new(:sty, :zeropage),
    0x85 => new(:sta, :zeropage),
    0x86 => new(:stx, :zeropage),
    0x87 => new(:sax, :zeropage, illegal: true),
    0x88 => new(:dey, :implied),
    0x89 => new(:nop_nocycle, :immediate, illegal: true),
    0x8a => new(:txa, :implied),
    0x8b => new(:ane, :immediate, illegal: true),
    0x8c => new(:sty, :absolute),
    0x8d => new(:sta, :absolute),
    0x8e => new(:stx, :absolute),
    0x8f => new(:sax, :absolute, illegal: true),

    0x90 => new(:bcc, :relative),
    0x91 => new(:sta, :indirect_y),
    0x92 => new(:jam, :implied, illegal: true),
    0x93 => new(:sha, :indirect_y, illegal: true),
    0x94 => new(:sty, :zeropage_x),
    0x95 => new(:sta, :zeropage_x),
    0x96 => new(:stx, :zeropage_y),
    0x97 => new(:sax, :zeropage_y, illegal: true),
    0x98 => new(:tya, :implied),
    0x99 => new(:sta, :absolute_y),
    0x9a => new(:txs, :implied),
    0x9b => new(:tas, :absolute_y, illegal: true),
    0x9c => new(:shy, :absolute_x, illegal: true),
    0x9d => new(:sta, :absolute_x),
    0x9e => new(:shx, :absolute_y, illegal: true),
    0x9f => new(:sha, :absolute_y, illegal: true),

    0xa0 => new(:ldy, :immediate),
    0xa1 => new(:lda, :indirect_x),
    0xa2 => new(:ldx, :immediate),
    0xa3 => new(:lax, :indirect_x, illegal: true),
    0xa4 => new(:ldy, :zeropage),
    0xa5 => new(:lda, :zeropage),
    0xa6 => new(:ldx, :zeropage),
    0xa7 => new(:lax, :zeropage, illegal: true),
    0xa8 => new(:tay, :implied),
    0xa9 => new(:lda, :immediate),
    0xaa => new(:tax, :implied),
    0xab => new(:lxa, :immediate, illegal: true),
    0xac => new(:ldy, :absolute),
    0xad => new(:lda, :absolute),
    0xae => new(:ldx, :absolute),
    0xaf => new(:lax, :absolute, illegal: true),

    0xb0 => new(:bcs, :relative),
    0xb1 => new(:lda, :indirect_y, boundary_cycle: true),
    0xb2 => new(:jam, :implied, illegal: true),
    0xb3 => new(:lax, :indirect_y, boundary_cycle: true, illegal: true),
    0xb4 => new(:ldy, :zeropage_x),
    0xb5 => new(:lda, :zeropage_x),
    0xb6 => new(:ldx, :zeropage_y),
    0xb7 => new(:lax, :zeropage_y, illegal: true),
    0xb8 => new(:clv, :implied),
    0xb9 => new(:lda, :absolute_y, boundary_cycle: true),
    0xba => new(:tsx, :implied),
    0xbb => new(:las, :absolute_y, boundary_cycle: true, illegal: true),
    0xbc => new(:ldy, :absolute_x, boundary_cycle: true),
    0xbd => new(:lda, :absolute_x, boundary_cycle: true),
    0xbe => new(:ldx, :absolute_y, boundary_cycle: true),
    0xbf => new(:lax, :absolute_y, boundary_cycle: true, illegal: true),

    0xc0 => new(:cpy, :immediate),
    0xc1 => new(:cmp, :indirect_x),
    0xc2 => new(:nop_nocycle, :immediate, illegal: true),
    0xc3 => new(:dcp, :indirect_x, illegal: true),
    0xc4 => new(:cpy, :zeropage),
    0xc5 => new(:cmp, :zeropage),
    0xc6 => new(:dec, :zeropage),
    0xc7 => new(:dcp, :zeropage, illegal: true),
    0xc8 => new(:iny, :implied),
    0xc9 => new(:cmp, :immediate),
    0xca => new(:dex, :implied),
    0xcb => new(:sbx, :immediate, illegal: true),
    0xcc => new(:cpy, :absolute),
    0xcd => new(:cmp, :absolute),
    0xce => new(:dec, :absolute),
    0xcf => new(:dcp, :absolute, illegal: true),

    0xd0 => new(:bne, :relative),
    0xd1 => new(:cmp, :indirect_y, boundary_cycle: true),
    0xd2 => new(:jam, :implied, illegal: true),
    0xd3 => new(:dcp, :indirect_y, illegal: true),
    0xd4 => new(:nop, :zeropage_x, illegal: true),
    0xd5 => new(:cmp, :zeropage_x),
    0xd6 => new(:dec, :zeropage_x),
    0xd7 => new(:dcp, :zeropage_x, illegal: true),
    0xd8 => new(:cld, :implied),
    0xd9 => new(:cmp, :absolute_y, boundary_cycle: true),
    0xda => new(:nop, :implied, illegal: true),
    0xdb => new(:dcp, :absolute_y, illegal: true),
    0xdc => new(:nop, :absolute_x, boundary_cycle: true, illegal: true),
    0xdd => new(:cmp, :absolute_x, boundary_cycle: true),
    0xde => new(:dec, :absolute_x),
    0xdf => new(:dcp, :absolute_x, illegal: true),

    0xe0 => new(:cpx, :immediate),
    0xe1 => new(:sbc, :indirect_x),
    0xe2 => new(:nop_nocycle, :immediate, illegal: true),
    0xe3 => new(:isc, :indirect_x, illegal: true),
    0xe4 => new(:cpx, :zeropage),
    0xe5 => new(:sbc, :zeropage),
    0xe6 => new(:inc, :zeropage),
    0xe7 => new(:isc, :zeropage, illegal: true),
    0xe8 => new(:inx, :implied),
    0xe9 => new(:sbc, :immediate),
    0xea => new(:nop, :implied),
    0xeb => new(:sbc, :immediate, illegal: true),
    0xec => new(:cpx, :absolute),
    0xed => new(:sbc, :absolute),
    0xee => new(:inc, :absolute),
    0xef => new(:isc, :absolute, illegal: true),

    0xf0 => new(:beq, :relative),
    0xf1 => new(:sbc, :indirect_y, boundary_cycle: true),
    0xf2 => new(:jam, :implied, illegal: true),
    0xf3 => new(:isc, :indirect_y, illegal: true),
    0xf4 => new(:nop, :zeropage_x, illegal: true),
    0xf5 => new(:sbc, :zeropage_x),
    0xf6 => new(:inc, :zeropage_x),
    0xf7 => new(:isc, :zeropage_x, illegal: true),
    0xf8 => new(:sed, :implied),
    0xf9 => new(:sbc, :absolute_y, boundary_cycle: true),
    0xfa => new(:nop, :implied, illegal: true),
    0xfb => new(:isc, :absolute_y, illegal: true),
    0xfc => new(:nop, :absolute_x, boundary_cycle: true, illegal: true),
    0xfd => new(:sbc, :absolute_x, boundary_cycle: true),
    0xfe => new(:inc, :absolute_x),
    0xff => new(:isc, :absolute_x, illegal: true)
  }
end

Instance Method Details

#boundary_cycle? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/badline/instruction.rb', line 304

def boundary_cycle?
  @boundary_cycle
end

#illegal? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/badline/instruction.rb', line 308

def illegal?
  @illegal
end

#length ⇒ Object 



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# File 'lib/badline/instruction.rb', line 312

def length
  1 + operand_length
end

#operand? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/badline/instruction.rb', line 316

def operand?
  operand_length.positive?
end