Class: MicroCisc::Compile::Compiler

Inherits:
Object
  • Object
show all
Defined in:
lib/micro_cisc/compile/compiler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text) ⇒ Compiler

Returns a new instance of Compiler.



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# File 'lib/micro_cisc/compile/compiler.rb', line 6

def initialize(text)
  @text = text
  @command_count = 0
  parse
end

Instance Attribute Details

#command_count ⇒ Object (readonly)

Returns the value of attribute command_count.



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# File 'lib/micro_cisc/compile/compiler.rb', line 4

def command_count
  @command_count
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/micro_cisc/compile/compiler.rb', line 12

def parse
  line_number = 1
  @instructions = []
  address = 0
  @labels = {}
  @indexed_vars = {}
  @equivalents = {}
  errors = []
  lgen = MicroCisc::Compile::LabelGenerator.new
  @command_count = 0
  @text.each_line do |line|
    begin
      statement = MicroCisc::Compile::Statement.new(lgen, line, @indexed_vars, @equivalents)
      command = false
      statement.parse.each do |instruction|
        if instruction.label?
          @labels[instruction.label] = address
        elsif instruction.instruction?
          @instructions << [line_number, instruction]
          command = true
          address += 1
        elsif instruction.data?
          @instructions += instruction.data.map { |d| [line_number, d] }
          line_string = []
          word_counts = instruction.data.map do |d|
            if d.is_a?(String)
              line_string << d.unpack("S*").map { |w| '%04x' % w }.join
              d.size / 2
            else
              line_string << d.join('.')
              1 # 1 16-bit word reference
            end
          end
          address += word_counts.sum
        end
      end
      @command_count += 1 if command
    rescue ArgumentError => e
      MicroCisc.logger.error("Error on line #{line_number}: #{e.message}\n  #{line}")
      errors << [line_number, e, line]
    end
    line_number += 1
  end

  if errors.size > 0
    errors = errors.map do |error|
      "#{error[0]}: #{error[1]}\n  #{error[2]}"
    end
    MicroCisc.logger.error("\n\nErrors found:\n\n#{errors.join("\n")}")
    exit(1)
  end
end

#serialize(file = nil) ⇒ Object 



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# File 'lib/micro_cisc/compile/compiler.rb', line 65

def serialize(file = nil)
  @serialize ||=
    begin
      words = []
      dstart = nil
      MicroCisc.logger.info("ADDRESS: INS-WORD  LINE#: SOURCE")
      @instructions.each do |(line_number, ins)|
        if ins.is_a?(String)
          address = words.length
          ins_words = ins.unpack("S*")
          dstart ||= address
          words += ins_words
        elsif ins.is_a?(Array)
          dstart ||= address
          # Address reference in data
          label_address = @labels[ins.first]
          if ins.last == 'disp'
            words << label_address - address
          elsif ins.last == 'imm'
            words << (label_address & 0xFFFF)
          end
        else
          address = words.length
          if dstart
            MicroCisc.logger.info(" 0x#{'%04x' % dstart}: #{(address - dstart)} words of data")
            dstart = nil
          end
          MicroCisc.logger.info(" 0x#{'%04x' % address}: 0x#{'%04x' % ins.encoded(@labels, address)}   #{'% 6d' % line_number}: " + ins.original.gsub("\n", ""))
          words << ins.encoded(@labels, address)
        end
      end
      if dstart
        address = words.length
        MicroCisc.logger.info(" 0x#{'%04x' % dstart}: #{(address - dstart)} words of data")
      end
      words
    end

  File.open(file, 'w') do |file|
    file.write(@serialize.pack("S*"))
  end if file

  @serialize
end