ISeqで遊ぼう

Transcript

1. *4FRͰ༡΅͏
2. ͓͓͍͔ͭ͠͞ ৯΂ϩά
   $5-
   νʔϑʜ
3. ࠓ೔ͷ಺༰͸SVCZΛָ͠Ή͓࿩Ͱ͢
   QSPEVDUJPO؀ڥͰࢼͨ͠Γ͠ͳ͍Ͱ͍ͩ͘͞Ͷ
4. σϓϩΠ͢Δͧʔ
5. NoMethodError (undefined method `address’ for nil:NilClass)
6. !VTFSBEESFTTQSFGFDUVSFOBNF
   cc
   lඇެ։z
7. SFRVJSFΛͻͱͭ௥Ճ͢Δ͚ͩͰ
   ໰୊Λղܾͯ͠͝ཡʹ͍Ε·͢
8. %&.0
9. require_relative "hook_load_iseq" class GuardNil < HookLoadIseq def syntax(code) code.gsub(".", "&.") end end GuardNil.new.attach
10. require_relative "hook_load_iseq" class GuardNil < HookLoadIseq def syntax(code) code.gsub(".", "&.") end end GuardNil.new.attach
11. require_relative "hook_load_iseq" class GuardNil < HookLoadIseq def syntax(code) code.gsub(".", "&.") end end GuardNil.new.attach
12. class HookLoadIseq def attach RubyVM::InstructionSequence.singleton_class.prepend build_module end private def build_module inst = self Module.new do define_method("load_iseq") do |path| source_code = File.read(path) ruby_code = inst.syntax(source_code) RubyVM::InstructionSequence.compile(ruby_code) end end end end
13. class HookLoadIseq def attach RubyVM::InstructionSequence.singleton_class.prepend build_module end private def build_module inst = self Module.new do define_method("load_iseq") do |path| source_code = File.read(path) ruby_code = inst.syntax(source_code) RubyVM::InstructionSequence.compile(ruby_code) end end end end
14. class HookLoadIseq def attach RubyVM::InstructionSequence.singleton_class.prepend build_module end private def build_module inst = self Module.new do define_method("load_iseq") do |path| source_code = File.read(path) ruby_code = inst.syntax(source_code) RubyVM::InstructionSequence.compile(ruby_code) end end end end
15. class HookLoadIseq def attach RubyVM::InstructionSequence.singleton_class.prepend build_module end private def build_module inst = self Module.new do define_method("load_iseq") do |path| source_code = File.read(path) ruby_code = inst.syntax(source_code) RubyVM::InstructionSequence.compile(ruby_code) end end end end
16. class HookLoadIseq def attach RubyVM::InstructionSequence.singleton_class.prepend build_module end private def build_module inst = self Module.new do define_method("load_iseq") do |path| source_code = File.read(path) ruby_code = inst.syntax(source_code) RubyVM::InstructionSequence.compile(ruby_code) end end end end
17. class HookLoadIseq def attach RubyVM::InstructionSequence.singleton_class.prepend build_module end private def build_module inst = self Module.new do define_method("load_iseq") do |path| source_code = File.read(path) ruby_code = inst.syntax(source_code) RubyVM::InstructionSequence.compile(ruby_code) end end end end
18. 3VCZ7.*OTUSBDUJPO4FRVFODFΫϥεʹ
    MPBE@JTFR
    ΫϥεϝιουΛ௥Ճ͢Δͱ
    SFRVJSF
    ͕ίʔϧ͞Εͨͱ͖ͷॲཧʹׂΓࠐΉ͜ͱ͕Ͱ͖Δ
19. ιʔείʔυ SFRVJSF
    lpMF@OBNFz τʔΫϯྻ ߏจ໦ "45 όΠτίʔυ 3VCZ7.
20. ιʔείʔυ SFRVJSF
    lpMF@OBNFz τʔΫϯྻ ߏจ໦ "45 όΠτίʔυ 3VCZ7. MPBE@JTFR
21. class Tsuka var kazu int = 1 var moji string = "tsuka" var kuji bool = false end ͜Μͳจ๏΋࣮ߦՄೳʹ
22. ͜Μͳจ๏΋࣮ߦՄೳʹ දࣔ 1 + 2 ശ Ͷ͜ ಈ࡞ ͳ͘ "ʹΌʔ" ͓ΘΓ ͓ΘΓ ͨ· = Ͷ͜.͏·ΕΔ දࣔ ͨ·.ͳ͘
23. %&.0লུ
24. ͦ͢͝͏ͳ͜ͱݴ͍ͬͯΔ͚Ͳɺ
    จࣈྻॲཧ͍ͯ͠Δ͚ͩ͡Όͳ͍ͷ
25. require_relative "hook_load_iseq" class GuardNil < HookLoadIseq def syntax(code) code.gsub(".", "&.") end end GuardNil.new.attach
26. 
27. syntax error, unexpected tINTEGER, expecting '(' (SyntaxError) 3&.14
28. ιʔείʔυ SFRVJSF
    lpMF@OBNFz τʔΫϯྻ ߏจ໦ "45 όΠτίʔυ 3VCZ7. MPBE@JTFR
29. ιʔείʔυ SFRVJSF
    lpMF@OBNFz τʔΫϯྻ ߏจ໦ "45 όΠτίʔυ 3VCZ7. MPBE@JTFR
30. όΠτίʔυΛ΋͏ͪΐͬͱ௥ͬͯΈΔ
31. 3VCZ7.*OTUSVDUJPO4FRVFODFEJTBTN
    ͰɺόΠτίʔυΛݟ΍ͯ͘͘͢͠ΕΔ
32. !VTFSBEESFTT
33. 0000 getinstancevariable :@user, <is:0> 0003 send <callinfo!mid:address, argc:0, …>, … 0007 leave
34. !VTFSBEESFTT
35. 0000 getinstancevariable :@user, <is:0> 0003 dup 0004 branchnil 12 0006 send <callinfo!mid:address, argc:0, …>,… 0010 jump 12 0012 leave
36. όΠτίʔυΛ΅ͬͪΦϖϨʔλ༻ʹ
    ॻ͖׵͑Ε͹͍͍ͷΑ
37. 3VCZ7.*OTUSVDUJPO4FRVFODFUP@B
    ͰɺόΠτίʔυ͕ΦϒδΣΫτͷ഑ྻͰฦͬͯ͘Δ
38. !VTFSBEESFTT
39. ["YARVInstructionSequence/SimpleDataFormat", 2, 5, 1, {:arg_size=>0, :local_size=>0, :stack_max=>1, :code_range=>[1, 0, 1, 13]}, "<compiled>", "<compiled>", nil, 1, :top, [], {}, [], [1, :RUBY_EVENT_LINE, [:getinstancevariable, :@user, 0], [:send, {:mid=>:address, :flag=>32, :orig_argc=>0}, false, nil], [:leave]]]
40. ["YARVInstructionSequence/SimpleDataFormat", 2, 5, 1, {:arg_size=>0, :local_size=>0, :stack_max=>1, :code_range=>[1, 0, 1, 13]}, "<compiled>", "<compiled>", nil, 1, :top, [], {}, [], [1, :RUBY_EVENT_LINE, [:getinstancevariable, :@user, 0], [:send, {:mid=>:address, :flag=>32, :orig_argc=>0}, false, nil], [:leave]]]
41. ϝιουίʔϧͷ෦෼Λ΅ͬͪΦϖϨʔλʹॻ͖׵͑Δ ary = iseq.to_a new_bytecode = [] bytecode = ary[13] pc = 0 bytecode.each do |b| unless b.is_a?(Array) new_bytecode << b next end unless [ :send, :opt_send_without_block].include?(b[0]) pc += b.size new_bytecode << b next end
42. ϝιουίʔϧͷ෦෼Λ΅ͬͪΦϖϨʔλʹॻ͖׵͑Δ buffer = [] pc += 1 buffer << [ :dup ] pc += 2 buffer << [ :branchnil, :temp ] pc += b.size buffer << b pc += 2 label = "label_#{pc}".to_sym buffer << [ :jump, label ] buffer[1][1] = label buffer << label new_bytecode += buffer end ary[13] = new_bytecode
43. "SSBZදݱͷόΠτίʔυΛ
    *OTUSVDUJPO4FRVFODFΦϒδΣΫτʹ͢Δज़͕ͳ͍
44. pEEMFΛ࢖ͬͯ$ͷؔ਺ΛݺͿ def load_from_array(ary) rb_iseq_load.call(Fiddle.dlwrap(ary), nil, nil).to_value end def rb_iseq_load return @rb_iseq_load if @rb_iseq_load address = Fiddle::Handle::DEFAULT['rb_iseq_load'] @rb_iseq_load = Fiddle::Function.new( address, [Fiddle::TYPE_VOIDP] * 3, Fiddle::TYPE_VOIDP ) end
45. 3VCZ7.*OTUSVDUJPO4FRVFODFʹ
    
    USBOTMBUF
    ΫϥεϝιουΛ༻ҙ͢Δͱ
    όΠτίʔυΛ3VCZ7.ʹ౉͢લʹࠩ͠ସ͑Δ͜ͱ͕Ͱ͖Δ
46. ιʔείʔυ SFRVJSF
    lpMF@OBNFz τʔΫϯྻ ߏจ໦ "45 όΠτίʔυ 3VCZ7. USBOTMBUF
47. module GuardNil2 def translate(iseq) ary = iseq.to_a ary2 = {όΠτίʔυॻ͖׵͑ॲཧ}(ideq) load_from_array(ary2) end end RubyVM::InstructionSequence.singleton_class.prepend GuardNil2
48. %&.0
49. ͓͠·͍