Skip to content
This repository
Fetching contributors…

Cannot retrieve contributors at this time

file 973 lines (798 sloc) 23.662 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
# A simple parser to transform a description of the VM instructions into
# various implementation files.
#
# The parser recognizes three forms presently:
#
# 1. define NAME <value>
# 2. section "Some description"
# 3. instruction opcode_name(arg1, arg2) [ consumed -- produced ]
# body
# end
#
# Once the forms are parsed, each type (a subclass of Definition) implements
# methods to emit its form in the context of a particular generator. In other
# words, the generated files are produced by a set of methods, each of which
# simply iterate the array of definitions in order calling a method for that
# generator.
#
# For example, to generate the opcode definitions file, the #opcode_definition
# method is called on each definition parsed from the 'instructions.def' file.
#
# The format of the instruction definition needs addition explanation. The
# instructions can take 0, 1, or 2 arguments. The arguments are listed in
# parenthesis after the instruction name.
#
# Each instruction has a stack effect, or the stack items consumed and the
# stack items produced. These are described in the square brackets after the
# argument list a la Forth. The '--' symbol separates the consumed from the
# produced.
#
# The names of the stack items are purely for documentation except in the
# special case of an item named like '+count'. This special form refers to one
# of the instruction's arguments and means that the total number of stack
# items consumed is the sum of the explicit stack items listed and the value
# of the instruction's argument.
#
# For example, the 'make_array' instruction consumes 'count' items on the
# stack, but no additional items. While the 'send_stack' instruction consumes
# the 'receiver' and 'count' additional items.
#
# Finally, for instructions that alter the normal sequential flow of execution,
# the type of control flow change will be specified in curly braces, e.g.
# {branch}. The control flow behavior defaults to next, but for those
# instructions where control is (or may) change, one of the following flow
# types must be specified:
# branch - for instructions that branch within the same method
# send - for instructions that invoke another method
# yield - for instructions that yield to a block
# return - for instructions that return to the calling method
# raise - for instructions that invoke exception handling

class InstructionParser
  # Processes an opcode definition from the instruction parser into a method
  # called by the bytecode compiler's Generator to emit the instruction
  # stream.
  class GeneratorMethod
    def initialize(parser, file, opcode)
      @parser = parser
      @file = file
      @opcode = opcode
      @method_name = nil
      @before_stream = nil
      @after_stream = nil
      @before_stack = nil
      @after_stack = nil
    end

    def method_name
      @method_name || @opcode.name
    end

    def process
      __send__ :"process_#{@opcode.name}"
    end

    # Define the method signature.
    def method_signature
      case @opcode.arguments.size
      when 0
        @file.puts " def #{method_name}"
      when 1
        @file.puts " def #{method_name}(arg1)"
      when 2
        @file.puts " def #{method_name}(arg1, arg2)"
      end
    end

    # Append to the opcode stream.
    def method_append_stream
      case @opcode.arguments.size
      when 0
        @file.puts " @stream << #{@opcode.bytecode}"
      when 1
        @file.puts " @stream << #{@opcode.bytecode} << arg1"
      when 2
        @file.puts " @stream << #{@opcode.bytecode} << arg1 << arg2"
      end
      @file.puts " @ip += #{@opcode.arguments.size + 1}"
    end

    # Calculate the full stack affect of this opcode.
    def method_stack_effect
      read = @opcode.static_read_effect
      write = @opcode.static_write_effect

      if @opcode.extra
        if read > 0
          read = "arg#{@opcode.extra+1}+#{read}"
        else
          read = "arg#{@opcode.extra+1}"
        end
      end

      if @opcode.produced_extra
        if write > 0
          write = "(arg#{@opcode.produced_extra+1} * #{@opcode.produced_times})+#{write}"
        else
          write = "(arg#{@opcode.produced_extra+1} * #{@opcode.produced_times})"
        end
      end

      @file.puts " @current_block.add_stack(#{read}, #{write})"
    end

    def method_close
      @file.puts " @instruction = #{@opcode.bytecode}"
      @file.puts " end"
      @file.puts ""
    end

    def method_definition
      method_signature
      @before_stream.call if @before_stream
      method_append_stream
      @after_stream.call if @after_stream
      @before_stack.call if @before_stack
      method_stack_effect
      @after_stack.call if @after_stack
      method_close
    end

    def literal_method
      @before_stream = lambda { @file.puts " arg1 = find_literal arg1" }
      method_definition
    end

    def literal_count_method
      @before_stream = lambda do
        @file.puts " arg1 = find_literal arg1"
        @file.puts " arg2 = Integer(arg2)"
      end
      method_definition
    end

    def method_missing(sym, *args)
      method_definition
    end

    # Basic block creation, closing, transitions
    def bb_unconditional_branch
      @file.puts " @current_block.left = arg1.basic_block"
      @file.puts " @current_block.close"
      @file.puts " @current_block = new_basic_block"
    end

    def bb_conditional_branch
      @file.puts " @current_block.left = arg1.basic_block"
      @file.puts " @current_block.close"
      @file.puts " block = new_basic_block"
      @file.puts " @current_block.right = block"
      @file.puts " @current_block = block"
    end

    def bb_exit(check_stack)
      @file.puts " @current_block.close #{check_stack}"
      @file.puts " @current_block = new_basic_block"
    end

    # Categories of instructions. These could be done based on the control
    # flow attributes added to the instructions for the debugger, but that
    # would require more complicated parsing and contortions to work around
    # potential special cases. Instead, the simple #process_<opcode> method
    # is used and redundancy is factored out as needed.

    def unconditional_branch
      @before_stream = lambda { @file.puts " location = @ip + 1" }
      @after_stream = lambda { @file.puts " arg1.used_at location" }
      @after_stack = lambda { bb_unconditional_branch }
      method_definition
    end

    def conditional_branch
      @before_stream = lambda { @file.puts " location = @ip + 1" }
      @after_stream = lambda { @file.puts " arg1.used_at location" }
      @after_stack = lambda { bb_conditional_branch }
      method_definition
    end

    def unconditional_exit(check_stack=false)
      @after_stack = lambda { bb_exit check_stack }
      method_definition
    end

    # Specific instruction methods

    def process_goto
      unconditional_branch
    end

    def process_goto_if_false
      conditional_branch
    end

    def process_goto_if_true
      conditional_branch
    end

    def process_setup_unwind
      conditional_branch
    end

    def process_ret
      unconditional_exit true
    end

    def process_raise_exc
      unconditional_exit
    end

    def process_raise_return
      unconditional_exit true
    end

    def process_ensure_return
      unconditional_exit true
    end

    def process_raise_break
      unconditional_exit
    end

    def process_reraise
      unconditional_exit
    end

    def process_push_int
      method_signature

      # Integers greater than 256 are stored in the literals tuple.
      @file.puts <<EOM
if arg1 > 2 and arg1 < 256
@stream << #{@opcode.bytecode} << arg1
@current_block.add_stack(0, 1)
@ip += 2
@instruction = #{@opcode.bytecode}
else
case arg1
when -1
meta_push_neg_1
when 0
meta_push_0
when 1
meta_push_1
when 2
meta_push_2
else
push_literal arg1
end
end
end

EOM
    end

    def process_push_literal
      @method_name = :emit_push_literal
      method_definition
    end

    def process_dup_top
      method_definition
    end

    def process_swap_stack
      method_definition
    end

    def process_push_const
      # unused right now
    end

    def process_find_const
      literal_method
    end

    def process_push_ivar
      literal_method
    end

    def process_set_ivar
      literal_method
    end

    def process_check_serial
      literal_count_method
    end

    def process_check_serial_private
      literal_count_method
    end

    def process_create_block
      @before_stream = lambda do
        @file.puts " arg1 = add_literal arg1"
        @file.puts " @generators << arg1"
      end
      method_definition
    end

    def process_invoke_primitive
      literal_count_method
    end

    def process_call_custom
      literal_count_method
    end

    def process_zsuper
      literal_method
    end

    def process_cast_array
      method_signature
      make_array = @parser.find_opcode "make_array"
      @file.puts " unless @instruction == #{@opcode.bytecode} or @instruction == #{make_array.bytecode}"
      @file.puts " @stream << #{@opcode.bytecode}"
      @file.puts " @ip += 1"
      @file.puts " end"
      method_close
    end
  end

  class ParseError < Exception; end

  class Definition
    def opcode_definition(file)
    end

    def opcode_method(parser, file)
    end

    def opcode_name
    end

    def opcode_width
    end

    def opcode_prototype
    end

    def opcode_location
    end

    def opcode_implementation(file)
    end

    def opcode_enum
    end

    def opcode_define
    end

    def opcode_visitor
    end

    def opcode_stack_effect(file)
    end

    def opcode_documentation(file)
    end
  end

  class Section < Definition
    attr_reader :heading

    def initialize(line, doc)
      @heading = line.strip[1..-2]
    end

    def opcode_definition(file)
      file.print "\n # "
      file.puts @heading
    end
  end

  class Define < Definition
    attr_reader :name, :value

    def initialize(line, doc)
      @name, @value = line.strip.split
    end

    def opcode_definition(file)
      file.puts
      file.puts " #{@name} = #{@value}"
      file.puts
    end

    def opcode_define
      "#define #{@name} #{@value}"
    end
  end

  class InstructionDocumentation
    def initialize(instruction)
      @instruction = instruction
      @description = []
      @consumed = nil
      @produced = nil
      @see_also = []
      @notes = []
      @example = []
    end

    def parse(text)
      section = []

      text.each do |line|
        case line
        when /\[Description\]/
          section = @description
        when /\[Stack Before\]/
          section = @consumed = []
        when /\[Stack After\]/
          section = @produced = []
        when /\[See Also\]/
          section = @see_also
        when /\[Notes\]/
          section = @notes
        when /\[Example\]/
          section = @example
        else
          section << line[1..-1]
        end
      end

      self
    end

    def consumed
      # TODO: account for extra consumed
      @consumed || @instruction.consumed + ["..."]
    end

    def produced
      # TODO: account for extra produced
      @produced || @instruction.produced + ["..."]
    end

    def format(file)
      file.puts %[<h3><a class="instruction" name="#{name}">#{name}(#{arguments})</a></h3>]
    end

    def stack_effect(file)
      c = consumed
      p = produced
      n = c.size > p.size ? c.size : p.size

      file.puts %[\n<table class="stack_effect">]
      file.puts "<thead>"
      file.puts "<tr><th>Before</th><th>After</th></tr>"
      file.puts "</thead>"
      file.puts "<tbody>"
      n.times do |i|
        file.puts "<tr><td>#{c[i]}</td><td>#{p[i]}</td></tr>"
      end
      file.puts "</tbody>"
      file.puts "</table>"
    end

    def description(file)
      file.puts ""
      file.puts @description
      file.puts ""
    end

    def example(file)
      return if @example.empty?

      file.puts ""
      file.puts '#### Example'
      file.puts @example
      file.puts ""
    end

    def see_also(file)
      return if @see_also.empty?

      file.puts "\n<h4>See Also</h4>"
      file.puts %[<ul class="insn_cross_ref">]
      @see_also.each do |x|
        x = x.strip
        file.puts %[<li><a href="\##{x}">#{x}</a></li>]
      end
      file.puts "</ul>"
    end

    def notes(file)
      return if @notes.empty?

      file.puts ""
      file.puts '#### Notes'
      file.puts @notes
      file.puts ""
    end

    def name
      @instruction.name
    end

    def arguments
      @instruction.arguments.join ", "
    end

    def render(file)
      format file
      description file
      stack_effect file
      example file
      notes file
      see_also file
    end
  end

  class Instruction < Definition
    attr_reader :name, :bytecode, :arguments, :consumed, :extra,
                :produced, :produced_extra, :effect, :body, :control_flow,
                :produced_times

    def self.bytecodes
      @bytecodes
    end

    def self.bytecode
      @bytecodes ||= -1
      @bytecodes += 1
    end

    def initialize(parser, header, doc)
      @parser = parser
      @file = parser.file
      @header = header
      @body = []
      @doc = InstructionDocumentation.new(self).parse(doc)
      @extra = nil
      @produced_extra = nil
      @bytecode = self.class.bytecode
      @control_flow = :next
    end

    def parse
      parse_header
      parse_body
    end

    def parse_header
      m = @header.match(/(\w+)\(([^)]*)\) \[ ([\w+ ]*)-- ([\w+ ]*)\]( =>\s*(\w+))?/)
      unless m
        raise ParseError, "invalid instruction header '#{@header}' at #{@file.lineno}"
      end

      @name = m[1]

      @arguments = m[2].strip.split

      consumed = m[3].strip.split
      last = consumed.last
      if last and last[0] == ?+
        argument = last[1..-1]
        unless @extra = @arguments.index(argument)
          raise ParseError, "no argument named '#{arg}' at #{@file.lineno}"
        end
        consumed.pop
      end
      @consumed = consumed

      @produced = m[4].strip.split
      last = @produced.last
      if last and last[0] == ?+
        @produced_times = 0

        while last[0] == ?+
          @produced_times += 1
          last = last[1..-1]
        end

        unless @produced_extra = @arguments.index(argument)
          raise ParseError, "no argument named '#{arg}' at #{@file.lineno}"
        end
        @produced.pop
      end

      @effect = @produced.size - @consumed.size

      @control_flow = m[6].to_sym if m[6]
    end

    def static_read_effect
      @consumed.size
    end

    def static_write_effect
      @produced.size
    end

    def parse_body
      while line = @file.gets
        return if line =~ /^end\b/
        @body << line
      end
    end

    def opcode_definition(file)
      if @extra
        consumed = "[#{@consumed.size},#{@extra+1}]"
      else
        consumed = "#{@consumed.size}"
      end

      if @produced_extra
        produced = "[#{@produced.size}, #{@produced_extra+1}, #{@produced_times}]"
      else
        produced = "#{@produced.size}"
      end

      file.print " opcode %2d, :%-28s " % [@bytecode, @name + ","]

      stack = "[#{consumed}, #{produced}],"
      file.print ":stack => %-12s" % stack

      syms = @arguments.map { |x| ":#{x}" }.join(", ")
      args = "[#{syms}],"
      file.print ":args => %-20s" % args

      file.puts " :control_flow => :#{@control_flow}"
    end

    def opcode_method(parser, file)
      GeneratorMethod.new(parser, file, self).process
    end

    def opcode_name
      "op_#{@name}"
    end

    def opcode_width
      @arguments.size + 1
    end

    def opcode_prototype
      name = opcode_name
      indent = " " * (name.size + 9)
      prototype = "Object* #{name}(rubinius::VM* state, rubinius::MachineCode* mcode,
#{indent}rubinius::InterpreterCallFrame* const call_frame,
#{indent}rubinius::MachineCode::InterpreterState& is"

      unless @arguments.empty?
        prototype << ",\n#{indent}"
        prototype << @arguments.map { |a| "int #{a}" }.join(", ")
      end

      prototype << ");\n"
    end

    def opcode_enum
      "insn_#{@name}"
    end

    def opcode_location
      "op_impl_#{@name}"
    end

    def opcode_implementation(file)
      file.puts " #{opcode_location}: {"

      @arguments.each do |arg|
        file.puts " intptr_t #{arg} = next_int;"
      end

      @body.each do |line|
        file.puts " #{line}".rstrip
      end
    end

    def opcode_visitor
      "HANDLE_INST#{@arguments.size}(#{@bytecode}, #{@name});"
    end

    def opcode_stack_effect(file)
      file.puts "case InstructionSequence::insn_#{@name}:"
      read = static_read_effect
      write = static_write_effect

      if @extra
        if read > 0
          read = "operand#{@extra+1}+#{read}"
        else
          read = "operand#{@extra+1}"
        end
      end

      if @produced_extra
        if write > 0
          write = "(operand#{@produced_extra+1} * #{@produced_times})+#{write}"
        else
          write = "(operand#{@produced_extra+1} * #{@produced_times})"
        end
      end

      file.puts "if(read_effect) { *read_effect = (#{read}); }"
      file.puts "if(write_effect) { *write_effect = (#{write}); }"

      file.puts "return (#{write}) - (#{read});"
    end

    def opcode_documentation(file)
      @doc.render file
    end
  end

  # InstructionParser methods

  attr_reader :file, :objects

  def initialize(filename)
    @filename = filename
    @objects = []
    @parsed = false
    @blank_line = false
    @doc = []
  end

  def process_define(parser, line, doc)
    parser.objects << Define.new(line, doc)
  end

  def process_section(parser, line, doc)
    parser.objects << Section.new(line, doc)
  end

  def process_instruction(parser, line, doc)
    insn = Instruction.new parser, line, doc
    insn.parse
    parser.objects << insn
  end

  def parse
    return if @parsed

    File.open @filename, "rb" do |file|
      @file = file

      while line = @file.gets
        if index = line.index("#")
          if index == 0
            if @blank_line
              @doc.clear
              @blank_line = false
            end

            @doc << line
          end

          line = line[0, index]
        elsif line.strip.empty?
          @blank_line = true
          next
        end

        if m = line.match(/^(instruction|section|define) +(.*)$/)
          send :"process_#{m[1]}", self, m[2], @doc
          @doc.clear
        end
      end
    end

    @parsed = true
  end

  def find_opcode(name)
    @objects.find { |x| x.kind_of? Instruction and x.name == name }
  end

  # Generated output methods

  def generate_opcodes(filename)
    File.open filename, "wb" do |file|
      file.puts "# *** This file is generated by InstructionParser ***"
      file.puts
      file.puts "module Rubinius"
      file.puts " class InstructionSet"

      objects.each { |obj| obj.opcode_definition file }

      file.puts " end"
      file.puts "end"
    end
  end

  def generate_generator_methods(filename)
    File.open filename, "wb" do |file|
      file.puts "# *** This file is generated by InstructionParser ***"
      file.puts
      file.puts "module Rubinius"
      file.puts " module GeneratorMethods"

      objects.each { |obj| obj.opcode_method self, file }

      file.puts " end"
      file.puts "end"
    end
  end

  def generate_names(filename)
    File.open filename, "wb" do |file|
      file.puts "const char *rubinius::InstructionSequence::get_instruction_name(int op) {"
      file.puts " static const char instruction_names[] = {"

      offset = 0
      offsets = []
      objects.each do |obj|
        if name = obj.opcode_name
          file.puts " \"#{name}\\0\""
          offsets << offset
          offset += name.size + 1
        end
      end

      file.puts " };"
      file.puts

      file.puts " static const unsigned int instruction_name_offsets[] = {"
      file.print " "
      file.puts offsets.join(",\n ")
      file.puts " };"
      file.puts

      file.puts " return instruction_names + instruction_name_offsets[op];"
      file.puts "}"
    end
  end

  def generate_names_header(filename)
    File.open filename, "wb" do |file|
      file.puts "static const char *get_instruction_name(int op);"
      file.puts "typedef enum {"

      objects.each do |obj|
        if enum = obj.opcode_enum
          file.puts " #{enum} = #{obj.bytecode},"
        end
      end

      file.puts "} instruction_names;"
      file.puts "const static unsigned int cTotal = #{Instruction.bytecodes};"
    end
  end

  def generate_prototypes(filename)
    File.open filename, "wb" do |file|
      file.puts "extern \"C\" {"

      objects.each do |obj|
        if prototype = obj.opcode_prototype
          file.puts prototype
        end
      end

      file.puts "} // extern \"C\""
    end
  end

  def generate_sizes(filename)
    File.open filename, "wb" do |file|
      file.puts "size_t width = 0;"
      file.puts "switch(op) {"

      objects.each do |obj|
        if width = obj.opcode_width
          file.puts " case #{obj.bytecode}:"
          file.puts " width = #{width}; break;"
        end
      end

      file.puts "}"
    end
  end

  def generate_locations(filename)
    File.open filename, "wb" do |file|
      file.puts " static const void* insn_locations[] = {"

      objects.each do |obj|
        if location = obj.opcode_location
          file.puts " &&#{location},"
        end
      end

      file.puts " NULL"
      file.puts " };"
    end
  end

  def generate_implementations(filename)
    File.open filename, "wb" do |file|
      file.puts " DISPATCH;"

      objects.each do |obj|
        if obj.opcode_implementation(file)
          file.puts " DISPATCH;"
          file.puts " }"
        end
      end
    end
  end

  def generate_defines(filename)
    File.open filename, "wb" do |file|
      objects.each do |obj|
        if define = obj.opcode_define
          file.puts define
        end
      end
    end
  end

  def generate_visitors(filename)
    File.open filename, "wb" do |file|
      objects.each do |obj|
        if visitor = obj.opcode_visitor
          file.puts visitor
        end
      end
    end
  end

  def generate_stack_effects(filename)
    File.open filename, "wb" do |file|
      file.puts "static inline int stack_difference(opcode op,"
      file.puts " opcode operand1 = 0,"
      file.puts " opcode operand2 = 0,"
      file.puts " int* read_effect = 0, int* write_effect = 0)"
      file.puts "{"
      file.puts " switch(op) {"

      objects.each do |obj|
        obj.opcode_stack_effect file
      end

      file.puts " }"
      file.puts " abort();"
      file.puts " return 0;"
      file.puts "}"
    end
  end

  def generate_documentation(filename)
    File.open filename, "wb" do |file|
      objects.each do |obj|
        obj.opcode_documentation file
      end
    end
  end
end
Something went wrong with that request. Please try again.