Class: Rinline::Optimizer

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, method_name) ⇒ Optimizer

Returns a new instance of Optimizer.



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# File 'lib/rinline/optimizer.rb', line 14

def initialize(klass, method_name)
  @klass = klass
  @method_name = method_name
  @method = klass.instance_method(method_name)
end

Class Method Details

.optimize(klass, method_name) ⇒ String?

Returns optimized code if optimized.

Parameters:

  • klass (Class)
  • method_name (Symbol) —

    an instance method name

Returns:

  • (String, nil) —

    optimized code if optimized



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# File 'lib/rinline/optimizer.rb', line 10

def self.optimize(klass, method_name)
  self.new(klass, method_name).optimize
end

Instance Method Details

#optimize ⇒ Object 



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# File 'lib/rinline/optimizer.rb', line 20

def optimize
  return unless method.ruby_method?
  return if method.eval?
  ast = method.to_ast
  return unless ast
  return if ast.has_child?(:CONST)
  path = method.absolute_path
  replacements = []

  ast.traverse do |node, opt|
    case node.type
    when :VCALL
      target_method_name = node.children[0]
      next if method_name == target_method_name
      target_method =
        begin
          klass.instance_method(target_method_name)
        rescue NameError
          next
        end
      next unless target_method.expandable?

      to_ast = target_method.to_ast
      next unless to_ast.expandable_method?(0)

      to_path = target_method.absolute_path
      body = to_ast.method_body
      to_code =
        if body
          "((#{replace_lvar(body, to_path)}))"
        else
          "()"
        end
      replacements << {
        from: node.location(path),
        to: to_code,
      }
    when :FCALL
      target_method_name = node.children[0]
      next if method_name == target_method_name
      target_method =
        begin
          klass.instance_method(target_method_name)
        rescue NameError
          next
        end
      next unless target_method.expandable?

      to_ast = target_method.to_ast
      args = node.fcall_args
      next unless args&.type == :ARRAY
      next unless to_ast.expandable_method?(args.array_size)

      to_path = target_method.absolute_path
      lvar_suffix = gen_lvar_suffix

      args = assign_args(to_ast, node, path, lvar_suffix)
      body =
        if to_ast.method_body
          replace_lvar(to_ast.method_body, to_path, lvar_suffix: lvar_suffix)
        else
          "()"
        end
      to_code = "((#{args}#{body}))"
      replacements << {
        from: node.location(path),
        to: to_code
      }
      opt[:ignore_index] = 1 # Ignore arguments
    end
  end

  return if replacements.empty?
  return replace(ast, path, replacements).force_encoding(Encoding::UTF_8) # TODO: Support other encodings
end