Class: Gruesome::Z::Machine

Inherits:
Object
  • Object
show all
Defined in:
lib/gruesome/z/machine.rb

Overview

The class that initializes and maintains a Z-Machine

Instance Method Summary collapse

Constructor Details

#initialize(game_file) ⇒ Machine

Will create a new virtual machine for the game file



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# File 'lib/gruesome/z/machine.rb', line 15

def initialize(game_file)
  file = File.open(game_file, "rb")

  # I. Create memory space

  memory_size = File.size(game_file)
  save_file_name = File.basename(file, File.extname(file)) + ".sav"
  @memory = Memory.new(file.read(memory_size), save_file_name)

  # Set flags
  flags = @memory.force_readb(0x01)
  flags &= ~(0b1110000)
  @memory.force_writeb(0x01, flags)

  # Set flags 2
  flags = @memory.force_readb(0x10)
  flags &= ~(0b11111100)
  @memory.force_writeb(0x10, flags)

  # II. Read header (at address 0x0000) and associated tables
  @header = Header.new(@memory.contents)
  @object_table = ObjectTable.new(@memory)

  # III. Instantiate CPU
  @decoder = Decoder.new(@memory)
  @processor = Processor.new(@memory)
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/gruesome/z/machine.rb', line 43

def execute
  while true do
    i = @decoder.fetch
#          var = @memory.readv(0)
#          if var != nil
#            puts "var %00 = " + sprintf("%04x", var)
#            @memory.writev(0, var)
#          end
#          var = @memory.readv(1)
#          if var != nil
#            puts "var %01 = " + sprintf("%04x", @memory.readv(0x01))
#          end
#          puts "at $" + sprintf("%04x", @memory.program_counter) + ": " + i.to_s(@header.version)
    @memory.program_counter += i.length

    if i.opcode == Opcode::QUIT
      break
    end

    begin
      @processor.execute(i)
    rescue RuntimeError => fuh
      puts "error at $" + sprintf("%04x", @memory.program_counter) + ": " + i.to_s(@header.version)
    end
  end
end