Class: Z80Disassembler::Disassembler

Inherits:
Object
  • Object
show all
Defined in:
lib/z80_disassembler.rb

Constant Summary collapse

T_R =

0 1 2 3 4 5 6 7

[    'B',    'C',    'D',    'E',    'H',    'L', '(HL)',    'A'].freeze
T_CC = 
[   'NZ',    'Z',   'NC',    'C',   'PO',   'PE',    'P',    'M'].freeze
T_ALU = 
[  'ADD',  'ADC',  'SUB',  'SBC',  'AND',  'XOR',   'OR',   'CP'].freeze
T_ROT = 
[  'RLC',  'RRC',   'RL',   'RR',  'SLA',  'SRA',  'SLL',  'SRL'].freeze
T_IM = 
[    '0',  '0/1',    '1',    '2',    '0',  '0/1',    '1',    '2'].freeze
T_RP = 
[   'BC',   'DE',   'HL',   'SP'].freeze
T_RP2 = 
[   'BC',   'DE',   'HL',   'AF'].freeze
ASCII = 
[
  ' ', '!', '"', '#', '$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '.', '/',
  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
  '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\',']', '^', '_',
  '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
  'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~'
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, org = 32_768) ⇒ Disassembler

Returns a new instance of Disassembler.



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# File 'lib/z80_disassembler.rb', line 28

def initialize(file, org = 32_768)
  @file = file; @org = org.to_i
  if file.original_filename[-3..-1] == '.$C'
    File.open(@file) do |f|
      z = f.read(17)
      @file_name   = "#{z[0..7]}.#{z[8]}"
      @org         = bytes_to_int(z[ 9..10])
      @file_size   = bytes_to_int(z[11..12])
      @sectors     = bytes_to_int(z[13..14])
      checksum1    = bytes_to_int(z[15..16])
      checksum2    = (z[0..14].sum * 257 + 105).to_s(16)[-4..-1].hex
      @code        = f.read(@file_size).bytes if checksum1 == checksum2
    end
  end
  @code ||= File.open(@file).read.bytes
  @file_size ||= @file.size
  @x = 0; @y = 0; @z = 0; @p = 0; @q = 0; @xx = nil
  @lambda = nil; @prefix = nil; @prev = nil; @result = []
end

Instance Attribute Details

#org ⇒ Object (readonly)

Returns the value of attribute org.



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# File 'lib/z80_disassembler.rb', line 9

def org
  @org
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/z80_disassembler.rb', line 48

def start
  addr = @org
  bytes = []; ascii = []
  @code.each do |byte|
    load_vars(byte)
    str = command_from_byte(byte)
    @prev = byte.to_s(16)
    ascii << ((32..126).include?(byte) ? ASCII[byte - 32] : ' ')
    bytes << @prev.rjust(2, '0').upcase
    next unless str

    @result << [addr, "##{addr.to_s(16)}".upcase, str, bytes.join(' '), ascii.join]
    addr += bytes.size
    bytes = []
    ascii = []
  end
  @result
end

#text ⇒ Object 



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# File 'lib/z80_disassembler.rb', line 67

def text
  hash_links = {}
  del_links = []
  link_num = 0
  int_addrs = @org..(@org + @file_size)
  with_links = @result.select { |z| z[2] =~ /#[0-F]{4}/ && int_addrs.include?(z[2].split('#').last[0..3].hex) }
  with_links.each do |x|
    z = "##{x[2].split('#').last[0..3]}"
    hash_links[z] = "link_#{link_num += 1}" unless hash_links[z]
  end

  code = @result.map do |addr, addr16, str, bytes, ascii|
    del_links << hash_links[addr16] if hash_links[addr16]
    link = (hash_links[addr16] || '').ljust(16, ' ')
    adr = '#' + str.split('#').last[0..3]
    string = hash_links.keys.include?(adr) ? str.sub(adr, hash_links[adr]) : str
    "#{link} #{string.ljust(16, ' ')}; #{addr16.ljust(5, ' ')} / #{addr.to_s.ljust(5, ' ')} ; #{bytes.ljust(14, ' ')} ; #{ascii.ljust(4, ' ')} ;"
  end.join("\n")

  [
    '                 device zxspectrum48',
    '                 ORG #' + @org.to_s(16),
    hash_links.map { |key, val| "#{val.ljust(16, ' ')} equ #{key}" unless del_links.include?(val) }.compact.join("\n"),
    'begin:',
    code,
    'end:',
    '        savesna "disasm.sna", begin',
    '        savebin "disasm.C", begin, end - begin',
    ''
  ].join("\n")
end