Class: Lignite::OpCompiler

Inherits:
Object
  • Object
show all
Extended by:
Logger
Includes:
Bytes, Logger
Defined in:
lib/lignite/op_compiler.rb

Overview

Dynamically constructs methods for all the instructions in ev3.yml The methods return the ByteStrings corresponding to the ops.

Defined Under Namespace

Classes: TODO

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logger

default_logger, logger

Methods included from Bytes

#f32, #hexdump, #u16, #u32, #u8, #unpack_f32, #unpack_u16, #unpack_u32, #unpack_u8

Constructor Details

#initialize(globals = nil, locals = nil) ⇒ OpCompiler

Returns a new instance of OpCompiler.

Parameters:



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# File 'lib/lignite/op_compiler.rb', line 133

def initialize(globals = nil, locals = nil)
  self.class.load_yml
  @globals = globals
  @locals = locals
end

Class Method Details

.define_multiop(oname, commands) ⇒ Object 



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# File 'lib/lignite/op_compiler.rb', line 45

def self.define_multiop(oname, commands)
  names = commands.map do |cname, cdata|
    csym = cname.downcase.to_sym
    cvalue = cdata["value"]
    [cvalue, csym]
  end.to_h

  osym = oname.downcase.to_sym
  define_method(osym) do |*args|
    logger.debug "called #{osym} with #{args.inspect}"
    cvalue = args.shift
    csym = names.fetch(cvalue)
    send("#{osym}_#{csym}", *args)
  end
end

.define_op(oname, ovalue, cvalue, params) ⇒ Object 



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# File 'lib/lignite/op_compiler.rb', line 61

def self.define_op(oname, ovalue, cvalue, params)
  check_arg_count = true
  param_handlers = params.map do |par|
    case par["type"]
    when "PARLAB"           # a label, only one opcode
      raise TODO
    when "PARNO"            # the value says how many other params follow
      check_arg_count = false
      ->(x) { param_simple(x) }
    when "PARS"             # string
      raise TODO
    when "PARV"             # value, type depends
      raise TODO
    when "PARVALUES"
      raise TODO
    when "PAR8", "PAR16", "PAR32", "PARF"
      ->(x) { param_simple(x) }
    else
      raise "Unhandled param type #{par["type"]}"
    end
  end

  osym = oname.downcase.to_sym
  define_method(osym) do |*args|
    logger.debug "called #{osym} with #{args.inspect}"
    if check_arg_count && args.size != param_handlers.size
      raise ArgumentError, "expected #{param_handlers.size} arguments, got #{args.size}"
    end

    bytes = u8(ovalue)
    bytes += param_simple(cvalue) unless cvalue.nil?

    bytes += args.zip(param_handlers).map do |a, h|
      h ||= ->(x) { param_simple(x) }
      # h.call(a) would have self = Op instead of #<Op>
      instance_exec(a, &h)
    end.join("")
    logger.debug "returning bytecode: #{bytes.inspect}"
    bytes
  end
rescue TODO
  logger.debug "Could not define #{oname}"
end

.load_const(name, value) ⇒ Object 



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# File 'lib/lignite/op_compiler.rb', line 22

def self.load_const(name, value)
  raise "duplicate constant #{name}" if Lignite.const_defined?(name)
  Lignite.const_set(name, value)
end

.load_op(oname, odata) ⇒ Object 



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# File 'lib/lignite/op_compiler.rb', line 27

def self.load_op(oname, odata)
  ovalue = odata["value"]
  oparams = odata["params"]
  p1 = oparams.first
  if p1 && p1["type"] == "SUBP"
    commands = p1["commands"]
    commands.each do |cname, cdata|
      cvalue = cdata["value"]
      load_const(cname, cvalue)
      cparams = cdata["params"]
      define_op("#{oname}_#{cname}", ovalue, cvalue, cparams)
    end
    define_multiop(oname, commands)
  else
    define_op(oname, ovalue, nil, oparams)
  end
end

.load_yml ⇒ Object 



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# File 'lib/lignite/op_compiler.rb', line 107

def self.load_yml
  return if @loaded
  fname = File.expand_path("../../../data/ev3.yml", __FILE__)
  yml = YAML.load_file(fname)
  op_hash = yml["ops"]
  op_hash.each do |oname, odata|
    load_op(oname, odata)
  end

  defines = yml["defines"]
  defines.each do |dname, ddata|
    load_const(dname, ddata["value"])
  end

  enums = yml["enums"]
  enums.each do |ename, edata|
    edata["members"].each do |mname, mdata|
      load_const(mname, mdata["value"])
    end
  end

  @loaded = true
end