LLDB の世界からみた Swift

AKIBA.swift×Swift愛好会

Transcript

1. 2016/08/29
   AKIBA.swift×SwiftѪ޷ձ
   @dealforest
   Toshihiro Morimoto
   LLDB ͷੈք͔ΒΈͨ Swift
   

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2. ࣗݾ঺հ
   

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3. Works
   

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4. ࠓ೔͸ iOSDC Ͱ͓࿩ͨ͠͠
   ಺༰ͷҰ෦ΛਂງΓ͍͖ͯ͠·͢
   

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5. ͦͷલʹେࣄͳ͓ئ͍͕͋Γ·͢
   

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6. LLDB ͷ࿩͸ϙΧʔʔϯͱͳͬͯ
   ൓Ԡ͕ͳ͘൵͘͠ͳΔͷͰ
   3ׂΓ૿͠Ͱ͓ئ͍͠·͢!
   

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7. Έͳ͞Μ
   Swift ͸޷͖Ͱ͔͢ʁʁ
   

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8. ͸ʔʔʔ͍
   

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9. Ͳ͜Ͱ࢖͏ Swift ͕޷͖Ͱ͔͢ʁʁ
   

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10. • iOS Application, Playground, etc..
    • Server Side Swift
    • Swift Compiler
    • Swift Interpliter Language (SIL)
    • LLDB
    

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11. • iOS Application, Playground, etc..
    • Server Side Swift
    • Swift Compiler
    • Swift Interpliter Language (SIL)
    • LLDB
    

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12. LLDB ͷੈք͔ΒΈͨ Swift
    

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13. ࣮ߦ͢Δ
    (lldb) p “AKIBA.swift×SwiftѪ޷ձ”
    (String) $R1 = “AKIBA.swift×SwiftѪ޷ձ"
    (lldb) po “AKIBA.swift×SwiftѪ޷ձ”
    “AKIBA.swift×SwiftѪ޷ձ”
    (lldb) po $R1
    “AKIBA.swift×SwiftѪ޷ձ”
    

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14. ม਺Λఆٛ͢Δ
    (lldb) po let $text = “AKIBA.swift×SwiftѪ޷ձ"
    (lldb) po $text
    “AKIBA.swift×SwiftѪ޷ձ”
    

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15. ؔ਺Λఆٛ͢Δ
    // վߦ͢ΔͱΤϥʔʹͳΔͷͰҰߦͰॻ͘͜ͱ
    (lldb) po func $getText() -> String {
    return “AKIBA.swift×SwiftѪ޷ձ”
    ɹ}
    (lldb) po $getText()
    “AKIBA.swift×SwiftѪ޷ձ”
    

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16. UIImage ΛϑΝΠϧʹग़ྗ͢Δ
    (lldb) po let $path = “/Users/dealforest/lldb.png”
    (lldb) po let $image = UIImage(named: “sample”)
    (lldb) po let $data = UIImagePNGRepresentation($image)!
    (lldb) po $data.writeToFile($path, atomically: true)
    

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17. LLDB ͷੈք͔ΒݟΔͱ
    Կ͕ҧ͏ͷ͔
    

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18. ҧ͏఺
    • 1໋ྩ1ߦ
    • ຖճ po Λ͚ͭΔඞཁ͕͋Δ
    • ࣗ෼Ͱఆٛͨ͠ม਺Λఆٛɺࢀর͢Δͱ͖ʹ $ Λɹɹɹ
    ͚ͭΔඞཁ͕͋Δ
    

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19. طଘͷ Swift ίʔυΛ
    ͦͷ··ͩͱಈ͖·ͤΜ
    

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20. ΊΜͲ͍͘͞Ͱ͢Ͷ
    

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21. repl Ͱ࣮ߦͯ͠΍Ε͹
    ͜ͷ͋ͨΓͷ໰୊͸େମղܾ͠·͢
    

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22. ͕
    

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23. LLDB ͷੈքʹ Swift ͷੈքΛ
    ࡞Γ্͛ΔͷͰগ͠ҧ͏ؾ΋͠·͢
    

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24. ͦΕʹ͜ͷ··Ͱ͸
    Έͳ͞Μ࢖͏ؾ΋ى͖ͳ͍Ͱ͢ΑͶ
    

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25. Ͳ͏ʹ͔͍͖ͯ͠·͠ΐ͏
    

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26. ؔ਺ʹ͢Δ - before
    (lldb) po let $path = “/Users/dealforest/lldb.png”
    (lldb) po let $image = UIImage(named: “sample”)
    (lldb) po let $data = UIImagePNGRepresentation($image)!
    (lldb) po $data.writeToFile($path, atomically: true)
    

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27. ؔ਺ʹ͢Δ - after
    // վߦ͢ΔͱΤϥʔʹͳΔͷͰҰߦͰॻ͘͜ͱ
    (lldb) po func $saveImage(image: UImage) {
    let path = “/Users/dealforest/lldb.png”;
    let data = UIImagePNGRepresentation(image)!;
    data.writeToFile(path, atomically: true);
    }
    (lldb) po $saveImage(UIImage(named: “sample”))
    

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28. ؔ਺ʹ͢Δ
    // վߦ͢ΔͱΤϥʔʹͳΔͷͰҰߦͰॻ͘͜ͱ
    (lldb) po func $saveImage(image: UImage) {
    let path = “/Users/dealforest/lldb.png”;
    let data = UIImagePNGRepresentation(image)!;
    data.writeToFile(path, atomically: true);
    }
    (lldb) po $saveImage(UIImage(named: “sample”))
    

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29. ͦΕʹɺ͜ͷ··Ͱ͸
    ͜ͷؔ਺͸ӬଓԽ͞Ε·ͤΜ
    

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30. ຖճఆٛͯ͠࢖͏ͱ͔…
    

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31. LLDB Plugin ʹ͢Δ
    #!/usr/bin/env python
    import lldb
    def save_image(debugger, command, result, internal_dict):
    frame =
    lldb.debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
    result = frame.EvaluateExpression(command)
    target = result.GetLocation()
    expr = "expr -l objc++ -- (NSData *)UIImagePNGRepresentation((id)" + target + ")"
    frame.EvaluateExpression(expr)
    imagePath = '/Users/dealforest/lldb.png'
    saveImageTemplate = 'expr -l objc++ -- (void) [(NSData *){} writeToFile:@"{}"
    atomically:YES];'
    saveImageExpr = createImageFormatStr.format(result.GetName(), imagePath)
    lldb.debugger.HandleCommand(saveImageExpr)
    def __lldb_init_module(debugger,internal_dict):
    debugger.HandleCommand("command script add -f save_image.save_image save_image")
    print"save_image command enabled."
    save_image.py
    

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32. LLDB Plugin ʹ͢Δ
    command script import /save_image.py
    // ͜ΕͰىಈ࣌ʹಡΈࠐ·ΕΔͨΊӬଓԽ͞ΕΔ
    ~/.lldbinit
    

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33. LLDB Plugin ʹ͢Δ
    #!/usr/bin/env python
    import lldb
    def save_image(debugger, command, result, internal_dict):
    frame = lldb.debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
    result = frame.EvaluateExpression(command)
    target = result.GetLocation()
    expr = "expr -l objc++ -- (NSData *)UIImagePNGRepresentation((id)" + target + ")"
    frame.EvaluateExpression(expr)
    imagePath = '/Users/dealforest/lldb.png'
    saveImageTemplate = 'expr -l objc++ -- (void) [(NSData *){} writeToFile:@"{}" atomically:YES];'
    saveImageExpr = createImageFormatStr.format(result.GetName(), imagePath)
    lldb.debugger.HandleCommand(saveImageExpr)
    def __lldb_init_module(debugger,internal_dict):
    debugger.HandleCommand("command script add -f save_image.save_image save_image")
    print"save_image command enabled."
    ίϚϯυͷఆٛ
    save_image.py
    

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34. LLDB Plugin ʹ͢Δ
    #!/usr/bin/env python
    import lldb
    def save_image(debugger, command, result, internal_dict):
    frame = lldb.debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
    result = frame.EvaluateExpression(command)
    target = result.GetLocation()
    expr = "expr -l objc++ -- (NSData *)UIImagePNGRepresentation((id)" + target + ")"
    frame.EvaluateExpression(expr)
    imagePath = '/Users/dealforest/lldb.png'
    saveImageTemplate = 'expr -l objc++ -- (void) [(NSData *){} writeToFile:@"{}" atomically:YES];'
    saveImageExpr = createImageFormatStr.format(result.GetName(), imagePath)
    lldb.debugger.HandleCommand(saveImageExpr)
    def __lldb_init_module(debugger,internal_dict):
    debugger.HandleCommand("command script add -f save_image.save_image save_image")
    print"save_image command enabled."
    UIImage ͷ pointer Λऔಘ
    save_image.py
    

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35. LLDB Plugin ʹ͢Δ
    #!/usr/bin/env python
    import lldb
    def save_image(debugger, command, result, internal_dict):
    frame = lldb.debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
    result = frame.EvaluateExpression(command)
    target = result.GetLocation()
    expr = "expr -l objc++ -- (NSData *)UIImagePNGRepresentation((id)" + target + ")"
    frame.EvaluateExpression(expr)
    imagePath = '/Users/dealforest/lldb.png'
    saveImageTemplate = 'expr -l objc++ -- (void) [(NSData *){} writeToFile:@"{}" atomically:YES];'
    saveImageExpr = createImageFormatStr.format(result.GetName(), imagePath)
    lldb.debugger.HandleCommand(saveImageExpr)
    def __lldb_init_module(debugger,internal_dict):
    debugger.HandleCommand("command script add -f save_image.save_image save_image")
    print"save_image command enabled."
    UIImage Λ NSData ʹม׵
    save_image.py
    

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36. LLDB Plugin ʹ͢Δ
    #!/usr/bin/env python
    import lldb
    def save_image(debugger, command, result, internal_dict):
    frame = lldb.debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
    result = frame.EvaluateExpression(command)
    target = result.GetLocation()
    expr = "expr -l objc++ -- (NSData *)UIImagePNGRepresentation((id)" + target + ")"
    frame.EvaluateExpression(expr)
    imagePath = '/Users/dealforest/lldb.png'
    saveImageTemplate = 'expr -l objc++ -- (void) [(NSData *){} writeToFile:@"{}" atomically:YES];'
    saveImageExpr = createImageFormatStr.format(result.GetName(), imagePath)
    lldb.debugger.HandleCommand(saveImageExpr)
    def __lldb_init_module(debugger,internal_dict):
    debugger.HandleCommand("command script add -f save_image.save_image save_image")
    print"save_image command enabled."
    NSData ΛϑΝΠϧʹอଘ
    save_image.py
    

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37. ͡Ό͊͜ΕΛؔ਺Ͱॻ͘ͱ
    ͜͏ͳΓ·͢
    

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38. LLDB Plugin ʹ͢Δ
    #!/usr/bin/env python
    import lldb
    def save_image(debugger, command, result, internal_dict):
    lldb.debugger.HandleCommand("""
    expr -l swift --
    func $saveImage(image: UIImage) {
    let $data = UIImagePNGRepresentation($image)!
    $data.writeToFile("/Users/dealforest/lldb.png", atomically: true)
    }
    """.strip())
    expr = 'expr -l swift -- $saveImage(' + command + ')'
    lldb.debugger.HandleCommand(expr)
    def __lldb_init_module(debugger,internal_dict):
    debugger.HandleCommand("command script add -f save_image.save_image save_image")
    print"save_image command enabled."
    save_image.py
    

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39. LLDB Plugin ʹ͢Δ
    lldb.debugger.HandleCommand("""
    expr -l swift --
    func $saveImage(image: UIImage) { ɹɹɹɹɹɹɹɹɹ
    ɹ let $path = “/Users/dealforest/lldb.png”
    let $data = UIImagePNGRepresentation($image)!
    $data.writeToFile(path, atomically: true)
    }
    """.strip())
    save_image.py
    

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40. ͜ͷؔ਺ͷதͰ͸
    ݟ׳Εͨ Swift Ͱ͢Ͷ
    

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41. ޻෉࣍ୈͰී௨ʹ Swift ͕
    ॻ͚ΔΑ͏ʹͳΓ·͢
    

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42. ؆୯ʹσόοά༻ͷίϚϯυΛ
    ࡞Δ͜ͱ΋Ͱ͖ΔͷͰΦεεϝͰ͢Α
    

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43. ͍͔͕Ͱ͔ͨ͠ʁʁ
    

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44. Swift ͰΘ͍Θ͍͢Δωλʹ
    ͳΕΕ͹޾͍Ͱ͢
    

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45. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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