JAX Munich 2012 - Mastering Java bytecode

Transcript

1. Mastering Java Bytecode Anton Arhipov | ZeroTurnaround
2. whoami •  Anton Arhipov •  Java Dev / Product Lead •  ZeroTurnaround, JRebel •  @antonarhipov @javarebel
3. Today – Java Core •  Mastering Java Bytecode •  The Future of Java on Multi-Core, Lambdas, Spliterators and Methods •  OpenJDK JVM Internals •  Invokedynamic Deep Dive
5. Why Bytecode? •  Know your platform! •  Create your own compiler? •  Programming model (AOP, ORM) •  Awesome tools (JRebel J) •  … just bored?
6. THE INTRO
7. 1 + 2
8. 1 + 2 1 2 +
9. 1 + 2 1 2 +
10. 1 + 2 1 2 + PUSH 1 1
11. 1 + 2 1 2 + PUSH 1 PUSH 2 2 1
12. 1 + 2 1 2 + PUSH 1 PUSH 2 ADD 3
13. 1 + 2 1 2 + ICONST_1 ICONST_2 IADD 3
14. ? = 1 + 2
15. TAXONOMY
16. Bytecode •  One-byte instructions •  256 possible opcodes •  200+ in use
17. TYPE OPERATION
18. •  <TYPE> ::= b, s, c, i, l, f, d, a OPERATION TYPE
19. •  <TYPE> ::= b, s, c, i, l, f, d, a •  constant values (ldc, iconst_1) OPERATION TYPE
20. •  <TYPE> ::= b, s, c, i, l, f, d, a •  constant values (ldc, iconst_1) •  Local variables and stack interaction (load/store) •  Array operations (aload, astore) •  Math (add, sub, mul, div) •  Boolean/bitwise operations (iand, ixor) •  Comparisons (cmpg, cmpl, ifne, ifeq) •  Conversions (l2d, i2l) OPERATION TYPE
21. Bytecode Taxonomy
22. Bytecode Taxonomy Stack Manipulation
23. Bytecode Taxonomy Stack Manipulation Flow Control
24. Bytecode Taxonomy Stack Manipulation Flow Control Object Model
25. Bytecode Taxonomy Stack Manipulation Flow Control Arithmetics Object Model
26. Bytecode Taxonomy Stack Manipulation Flow Control Arithmetics Object Model monitorenter monitorexit
27. TOOLING
28. javap •  Java class file disassembler •  Used with no options shows class structure only – Methods, superclass, interfaces, etc •  -c shows the bytecode •  -private shows all methods and members •  -s prints internal signatures •  -l prints line numbers and local variable tables
29. HELLO WORLD!
31. C:\work\geecon\classes>javap Hello -c
32. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return
33. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return the default constructor
34. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return push this to stack
35. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return invoke <init> on this
36. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return
37. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return public static void main(java.lang.String[]); Code: 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
38. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return public static void main(java.lang.String[]); Code: 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V get static field
39. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return public static void main(java.lang.String[]); Code: 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V load string to the stack
40. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return public static void main(java.lang.String[]); Code: 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V invoke method with parameter
41. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return public static void main(java.lang.String[]); Code: 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
42. C:\work\geecon\classes>javap Hello -c Compiled from "Hello.java" public class Hello extends java.lang.Object{ public Hello(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return public static void main(java.lang.String[]); Code: 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V What’s #1,#2, etc ?
43. C:\work\geecon\classes>javap Hello -c -verbose
44. C:\work\geecon\classes>javap Hello -c -verbose
45. C:\work\geecon\classes>javap Hello -c -verbose Compiled from "Hello.java“ public class Hello extends java.lang.Object SourceFile: "Hello.java" minor version: 0 major version: 50 Constant pool: const #1 = Method #6.#20; // java/lang/Object."<init>":()V const #2 = Field #21.#22; // java/lang/System.out:Ljava/io/PrintStream; const #3 = String #23; // Hello, World! const #4 = Method #24.#25; // java/io/PrintStream.println:(Ljava/lang/String;)V const #5 = class #26; // Hello const #6 = class #27; // java/lang/Object const #7 = Asciz <init>; const #8 = Asciz ()V;
46. C:\work\geecon\classes>javap Hello -c -verbose Compiled from "Hello.java“ public class Hello extends java.lang.Object SourceFile: "Hello.java" minor version: 0 major version: 50 Constant pool: const #1 = Method #6.#20; // java/lang/Object."<init>":()V const #2 = Field #21.#22; // java/lang/System.out:Ljava/io/PrintStream; const #3 = String #23; // Hello, World! const #4 = Method #24.#25; // java/io/PrintStream.println:(Ljava/lang/String;)V const #5 = class #26; // Hello const #6 = class #27; // java/lang/Object const #7 = Asciz <init>; const #8 = Asciz ()V;
47. C:\work\geecon\classes>javap Hello -c -verbose … public Hello(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return LineNumberTable: line 1: 0 LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LHello;
48. C:\work\geecon\classes>javap Hello -c -verbose … public Hello(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return LineNumberTable: line 1: 0 LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LHello;
49. C:\work\geecon\classes>javap Hello -c -verbose … public Hello(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: return LineNumberTable: line 1: 0 LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LHello;
50. C:\work\geecon\classes>javap Hello -c -verbose … public static void main(java.lang.String[]); Code: Stack=2, Locals=1, Args_size=1 0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3; //String Hello, World! 5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V 8: return LineNumberTable: line 4: 0 line 5: 8 LocalVariableTable: Start Length Slot Name Signature 0 9 0 args [Ljava/lang/String;
51. MODEL OF COMPUTATION
52. Stack Machine
53. Stack Machine •  JVM is a stack-based machine
54. Stack Machine •  JVM is a stack-based machine •  Each thread has a stack
55. Stack Machine •  JVM is a stack-based machine •  Each thread has a stack •  Stack stores frames
56. Stack Machine •  JVM is a stack-based machine •  Each thread has a stack •  Stack stores frames •  Frame is created on method invocation
57. Stack Machine •  JVM is a stack-based machine •  Each thread has a stack •  Stack stores frames •  Frame is created on method invocation •  Frame consists of: – Operand stack – Array of local variables
58. The Frame Operand stack Local variables 2 0 1 N … Constant Pool #1
59. public java.lang.String getName(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: getfield #2; //Field name:Ljava/lang/String; 4: areturn LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LGet;
60. public java.lang.String getName(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: getfield #2; //Field name:Ljava/lang/String; 4: areturn LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LGet; aload_0 getfield 00 02 areturn 0 1 2 3 4
61. public java.lang.String getName(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: getfield #2; //Field name:Ljava/lang/String; 4: areturn LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LGet; 2A B4 00 02 B0 0 1 2 3 4
62. public java.lang.String getName(); Code: Stack=1, Locals=1, Args_size=1 0: aload_0 1: getfield #2; //Field name:Ljava/lang/String; 4: areturn LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LGet;
63. STACK CRUNCHING
64. A B dup pop swap dup_x1 dup2_x1
65. A B dup pop swap dup_x1 dup2_x1 A
66. dup pop swap dup_x1 dup2_x1 A B
67. dup pop swap dup_x1 dup2_x1 A B
68. dup pop swap dup_x1 dup2_x1 A B B
69. dup pop swap dup_x1 dup2_x1 A B B B A
70. dup2_x2 How do you swap doubles?
71. dup2_x2
72. dup2_x2 dconst_0 0.0
73. dup2_x2 dconst_0 dconst_1 1.0 0.0
74. dup2_x2 dconst_0 dconst_1 swap 1.0 0.0
75. dup2_x2 dconst_0 dconst_1 swap 1.0 0.0 not allowed!
76. dup2_x2 dconst_0 dconst_1 swap2 1.0 0.0
77. dup2_x2 dconst_0 dconst_1 swap2 1.0 0.0 doesn’t exist
78. dup2_x2 dconst_0 dconst_1 dup2_x2 1.0 0.0 1.0
79. dup2_x2 dconst_0 dconst_1 dup2_x2 pop2 0.0 1.0
80. dup2_x2 dconst_0 dconst_1 dup2_x2 pop2 0.0 1.0 profit! J
81. LOCAL VARIABLES
82. Local Variables
83. Local Variables public int calculate(int); Code: Stack=2, Locals=2, Args_size=2 … LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LLocalVariables; 0 5 1 value I
84. Local Variables public int calculate(int); Code: Stack=2, Locals=2, Args_size=2 … LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LLocalVariables; 0 5 1 value I numbered from 0
85. Local Variables instance methods have this at 0 public int calculate(int); Code: Stack=2, Locals=2, Args_size=2 … LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LLocalVariables; 0 5 1 value I
86. public int calculate(int); Code: Stack=2, Locals=2, Args_size=2 … LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LLocalVariables; 0 5 1 value I Local Variables The table maps numbers to names
87. public int calculate(int); Code: Stack=2, Locals=2, Args_size=2 … LocalVariableTable: Start Length Slot Name Signature 0 5 0 this LLocalVariables; 0 5 1 value I Sized explicitly Local Variables
88. ldc "Hello" astore_0 iconst_1 astore_1 aload_0 depth value Stack var value Local Variables 0 1 2 3 4 0 1 2 3 4
89. ldc "Hello" astore_0 iconst_1 astore_1 aload_0 depth value Stack var value Local Variables "Hello" 0 1 2 3 4 0 1 2 3 4
90. ldc "Hello" astore_0 iconst_1 astore_1 aload_0 depth value var value Local Variables "Hello" 0 1 2 3 4 0 1 2 3 4 Stack
91. ldc "Hello" astore_0 iconst_1 astore_1 aload_0 depth value Stack var value Local Variables "Hello" 0 1 2 3 4 0 1 2 3 4 1
92. ldc "Hello" astore_0 iconst_1 astore_1 aload_0 depth value Stack var value Local Variables "Hello" 0 1 2 3 4 0 1 2 3 4 1
93. ldc "Hello" astore_0 iconst_1 astore_1 aload_0 depth value Stack var value Local Variables "Hello" 0 1 2 3 4 0 1 2 3 4 1 "Hello"
94. Stack Local Variables Table store load
95. OBJECTS
96. new <init> <clinit> Instance initialization method Class and interface initialization method Object Initialization 0xBB
97. Object Initialization: static {} static {}; Code: 0: iconst_1 1: putstatic #2; //Field a:I 4: iconst_2 5: putstatic #3; //Field b:I 8: return
98. Object Initialization: static {} static {}; Code: 0: iconst_1 1: putstatic #2; //Field a:I 4: iconst_2 5: putstatic #3; //Field b:I 8: return <clinit>
99. Object Initialization: new
100. Object Initialization: new
101. Object Initialization: new public Initializer(); Code:
102. Object Initialization: new public Initializer(); Code: 0: aload_0
103. Object Initialization: new public Initializer(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V
104. Object Initialization: new public Initializer(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: aload_0
105. Object Initialization: new public Initializer(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: aload_0 5: new #2; //class java/lang/Object 8: dup
106. Object Initialization: new public Initializer(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: aload_0 5: new #2; //class java/lang/Object 8: dup 9: invokespecial #1; //Method java/lang/Object."<init>":()V 12: putfield #3; //Field o:Ljava/lang/Object;
107. Object Initialization: new public Initializer(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: aload_0 5: new #2; //class java/lang/Object 8: dup 9: invokespecial #1; //Method java/lang/Object."<init>":()V 12: putfield #3; //Field o:Ljava/lang/Object; 15: return
108. Object Initialization: new public Initializer(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang/Object."<init>":()V 4: aload_0 5: new #2; //class java/lang/Object 8: dup 9: invokespecial #1; //Method java/lang/Object."<init>":()V 12: putfield #3; //Field o:Ljava/lang/Object; 15: return
109. Object Initialization: {}
110. Object Initialization: {} ?
111. Object Initialization: {} public Initializer(int); Code: 0: aload_0 1: invokespecial #1; // ..<init> 4: aload_0 5: iconst_1 6: putfield #2; //Field a:I 9: aload_0 10: iconst_2 11: putfield #3; //Field c:I 14: aload_0 15: iload_1 16: putfield #4; //Field b:I 19: return
113. There’s no initializer
114. METHOD INVOCATION
115. invokeXXX •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic
116. invokestatic •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic Integer.valueOf(“42”)
117. invokespecial •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic <init> private void foo(); super.method();
118. invokevirtual •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic class A A/method1 A/method2
119. invokevirtual •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic class A class B A/method1 A/method2
120. invokevirtual •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic class A class B A/method1 A/method2 A/method1 B/method2 B/method3
121. invokeinterface •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic class A class B impl X A/method1 A/method2 A/method1 B/method2 B/method3 X/methodX
122. invokeinterface •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic class A class B impl X A/method1 A/method2 A/method1 B/method2 B/method3 X/methodX D impl X D/method1 X/methodX
123. invokeinterface •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic class A class B impl X A/method1 A/method2 A/method1 B/method2 B/method3 X/methodX D impl X D/method1 X/methodX
124. invokeinterface •  invokestatic •  invokespecial •  invokevirtual •  invokeinterface •  invokedynamic Efficient Implementation of Java Interfaces: Invokeinterface Considered Harmless, Bowen Alpern, Anthony Cocchi, Stephen Fink, David Grove, and Derek Lieber, OOPSLA’01 class A class B impl X A/method1 A/method2 A/method1 B/method2 B/method3 X/methodX D impl X D/method1 X/methodX
125. Method Invocation
126. Method Invocation obj.method(param1, param2);
127. Method Invocation obj.method(param1, param2);
128. Method Invocation obj.method(param1, param2); push obj push param1 push param2 call method
129. Method Invocation obj.method(param1, param2); push obj push param1 push param2 call method obj
130. Method Invocation obj.method(param1, param2); push obj push param1 push param2 call method obj param1
131. Method Invocation obj.method(param1, param2); push obj push param1 push param2 call method obj param1 param2
132. Method Invocation obj.method(param1, param2); push obj push param1 push param2 call method obj?
133. Method Invocation this.add(1, 2); 0: aload_0 1: iconst_1 2: iconst_2 3: invokevirtual #2; //Method add:(II)I
134. INNER CLASSES
135. Inner Classes
136. Inner Classes
137. Inner Classes class Car$Engine extends j.l.Object{ final Car this$0; Car$Engine(Car); public void start(); Code: 0: aload_0 1: getfield #1; //Field this$0:LCar; 4: invokestatic #3; // Car.access$000:(LCar;)V 7: return }
138. Inner Classes public class Car extends j.l.Object{ public Car(); private void move(); static void access$000(Car); Code: 0: aload_0 1: invokespecial #1; // move: ()V; 4: return } class Car$Engine extends j.l.Object{ final Car this$0; Car$Engine(Car); public void start(); Code: 0: aload_0 1: getfield #1; //Field this$0:LCar; 4: invokestatic #3; // Car.access$000:(LCar;)V 7: return }
139. Inner Classes public class Car extends j.l.Object{ public Car(); private void move(); static void access$000(Car); Code: 0: aload_0 1: invokespecial #1; // move: ()V; 4: return } class Car$Engine extends j.l.Object{ final Car this$0; Car$Engine(Car); public void start(); Code: 0: aload_0 1: getfield #1; //Field this$0:LCar; 4: invokestatic #3; // Car.access$000:(LCar;)V 7: return }
140. “HOW DO THEY DO THAT?”
141. object Singleton { def test={} }
142. object Singleton { def test={} } $> scalac Singleton.scala Singleton.class Singleton$.class
143. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return }
144. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return }
145. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return }
146. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return } public final class Singleton$ extends java.lang.Object implements scala.ScalaObject { public static final Singleton$ MODULE$; public static {}; Code: 0: new #9; //class Singleton$ 3: invokespecial #12; //Method "<init>":()V 6: return public void test(); private Singleton$(); }
147. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return } public final class Singleton$ extends java.lang.Object implements scala.ScalaObject { public static final Singleton$ MODULE$; public static {}; Code: 0: new #9; //class Singleton$ 3: invokespecial #12; //Method "<init>":()V 6: return public void test(); private Singleton$(); }
148. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return } public final class Singleton$ extends java.lang.Object implements scala.ScalaObject { public static final Singleton$ MODULE$; public static {}; Code: 0: new #9; //class Singleton$ 3: invokespecial #12; //Method "<init>":()V 6: return public void test(); private Singleton$(); }
149. public final class Singleton extends java.lang.Object { public static final void test(); Code: 0: getstatic #11; //Field Singleton$.MODULE$:LSingleton$; 3: invokevirtual #13; //Method Singleton$.test:()V 6: return } public final class Singleton$ extends java.lang.Object implements scala.ScalaObject { public static final Singleton$ MODULE$; public static {}; public void test(); private Singleton$(); Code: 0: aload_0 1: invokespecial #17; //Method java/lang/Object."<init>":()V 4: aload_0 5: putstatic #19; //Field MODULE$:LSingleton$; 8: return
150. object Singleton { def test={} }
151. object Singleton { def test={} } public class Singleton { public void test(){ Singleton$.MODULE$.test(); } }
152. object Singleton { def test={} } public class Singleton { public void test(){ Singleton$.MODULE$.test(); } } public final class Singleton$ implements scala.ScalaObject { public static final Singleton$ MODULE$; static { new Singleton$(); } private Singleton$(){ MODULE$ = this; } public void test() { } }
153. class Groovy { }
154. class Groovy { } $> groovyc Groovy.groovy $> javap –c –p Groovy
155. class Groovy { } $> groovyc Groovy.groovy $> javap –c –p Groovy public class Test extends java.lang.Object implements groovy.lang.GroovyObject{ private static org.codehaus.groovy.reflection.ClassInfo $staticClassInfo; private transient groovy.lang.MetaClass metaClass; public static java.lang.Long __timeStamp; public static java.lang.Long __timeStamp__239_neverHappen1304807931117; private static java.lang.ref.SoftReference $callSiteArray; private static java.lang.Class $class$groovy$lang$MetaClass; private static java.lang.Class $class$Test; private static java.lang.Class $class$java$lang$String; public java.lang.Object this$dist$invoke$2(java.lang.String, java.lang.Object); public void this$dist$set$2(java.lang.String, java.lang.Object); public java.lang.Object this$dist$get$2(java.lang.String); protected groovy.lang.MetaClass $getStaticMetaClass(); public groovy.lang.MetaClass getMetaClass(); public void setMetaClass(groovy.lang.MetaClass); public java.lang.Object invokeMethod(java.lang.String, java.lang.Object); public java.lang.Object getProperty(java.lang.String); public void setProperty(java.lang.String, java.lang.Object);
156. OBJECTWEB ASM
157. SLIDES GOTO IDE SLIDES IDE: DEMO
158. https://github.com/antonarhipov
159. @antonarhipov anton@zeroturnaround.com