Imitate java command tool javap -p -verbose.
git clone https://github.com/wind2412/javap.git
cd javap
mkdir build; cd build
cmake ..
make
./javap
FYI, we can accept one another argument. For example, ./javap IA.class, the program argument of which is inside the build folder after running the above-mentioned build commands.
- Example:
Annotations.java
// simple example
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import java.lang.annotation.Inherited;
import javax.lang.model.element.*;
import java.util.*;
import javax.management.*;
@Retention(RetentionPolicy.RUNTIME)
@interface IA{
}
@interface IB{
String name() default "ha";
}
@interface IC{
IA a();
IB[] b();
String name() default "hh";
int age() default 32;
}
@Target(ElementType.PARAMETER)
@interface ID{
}
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@interface IE{
}
@Target(ElementType.TYPE_USE)
@interface IF{
}
@Target(ElementType.TYPE_USE)
@Retention(RetentionPolicy.RUNTIME)
@interface IG{
}
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@interface IH{
}
@Target(ElementType.TYPE)
@interface II{
}
@Target(ElementType.TYPE_PARAMETER)
@interface IJ{
}
@Inherited
@IL
@Target(ElementType.LOCAL_VARIABLE)
@interface IK{
}
@Target(ElementType.ANNOTATION_TYPE)
@interface IL{}
@Target(ElementType.CONSTRUCTOR)
@interface IM{}
@Target(ElementType.PACKAGE) // package-info.class 所用。详见：http://www.cnblogs.com/ycoe/archive/2009/09/26/1574565.html
@interface IN{}
class Enum{}
interface Interface{}
@II
@IH
public class Annotations <@IG T> extends @IG Enum implements @IG Interface{ // CLASS_EXTENDS
@IM
Annotations() {}
@IA
@IB(name = "ha")
@IC(name = "ok", a = @IA, b = { @IB(name = "a"), @IB(name = "b"), @IB()})
int i;
@IA
@IB(name = "ha")
@IC(name = "ok", a = @IA, b = { @IB(name = "a"), @IB(name = "b"), @IB()})
@SuppressWarnings("hahaha")
<@IF @IG @IJ T extends @IG ArrayList<@IG T>>
@IF @IG T check(@ID @IE @IF @IG T in) throws @IG RuntimeException {
try{
@IA @IK String i = "haha";
System.out.println(i instanceof @IF String);
int j = 0;
System.out.println((@IF char)j);
String @IG [] ss = new String[3];
@IG String[] sss = new String[3];
@IG ArrayList<@IG String> a = new ArrayList<>();
throw new @IG ClassNotFoundException();
} catch (@IG RuntimeException | @IG ClassNotFoundException g) {
}
return in;
}
}- Result:
./myjavap
(DEBUG) cafebabe 0 52 80
(DEBUG) constpool_size: 80
(DEBUG) # 1 = Methodref #15.#58
(DEBUG) # 2 = String #59
(DEBUG) # 3 = Fieldref #60.#61
(DEBUG) # 4 = Class #62
(DEBUG) # 5 = Methodref #63.#64
(DEBUG) # 6 = Methodref #63.#65
(DEBUG) # 7 = Class #62
(DEBUG) # 8 = Class #66
(DEBUG) # 9 = Methodref #8.#58
(DEBUG) # 10 = Class #67
(DEBUG) # 11 = Methodref #10.#58
(DEBUG) # 12 = Class #68
(DEBUG) # 13 = Class #67
(DEBUG) # 14 = Class #69
(DEBUG) # 15 = Class #70
(DEBUG) # 16 = Class #71
(DEBUG) # 17 = Utf8 i
(DEBUG) # 18 = Utf8 I
(DEBUG) # 19 = Utf8 RuntimeVisibleAnnotations
(DEBUG) # 20 = Utf8 LIA;
(DEBUG) # 21 = Utf8 RuntimeInvisibleAnnotations
(DEBUG) # 22 = Utf8 LIB;
(DEBUG) # 23 = Utf8 name
(DEBUG) # 24 = Utf8 ha
(DEBUG) # 25 = Utf8 LIC;
(DEBUG) # 26 = Utf8 ok
(DEBUG) # 27 = Utf8 a
(DEBUG) # 28 = Utf8 b
(DEBUG) # 29 = Utf8 <init>
(DEBUG) # 30 = Utf8 ()V
(DEBUG) # 31 = Utf8 Code
(DEBUG) # 32 = Utf8 LineNumberTable
(DEBUG) # 33 = Utf8 LIM;
(DEBUG) # 34 = Utf8 check
(DEBUG) # 35 = Utf8 (Ljava/util/ArrayList;)Ljava/util/ArrayList;
(DEBUG) # 36 = Utf8 StackMapTable
(DEBUG) # 37 = Class #72
(DEBUG) # 38 = Utf8 RuntimeVisibleTypeAnnotations
(DEBUG) # 39 = Utf8 LIG;
(DEBUG) # 40 = Utf8 RuntimeInvisibleTypeAnnotations
(DEBUG) # 41 = Utf8 LIF;
(DEBUG) # 42 = Utf8 Exceptions
(DEBUG) # 43 = Class #68
(DEBUG) # 44 = Utf8 MethodParameters
(DEBUG) # 45 = Utf8 in
(DEBUG) # 46 = Utf8 Signature
(DEBUG) # 47 = Utf8 <T:Ljava/util/ArrayList<TT;>;>(TT;)TT;
(DEBUG) # 48 = Utf8 LIJ;
(DEBUG) # 49 = Utf8 RuntimeVisibleParameterAnnotations
(DEBUG) # 50 = Utf8 LIE;
(DEBUG) # 51 = Utf8 RuntimeInvisibleParameterAnnotations
(DEBUG) # 52 = Utf8 LID;
(DEBUG) # 53 = Utf8 <T:Ljava/lang/Object;>LEnum;LInterface;
(DEBUG) # 54 = Utf8 SourceFile
(DEBUG) # 55 = Utf8 Annotations.java
(DEBUG) # 56 = Utf8 LIH;
(DEBUG) # 57 = Utf8 LII;
(DEBUG) # 58 = NameAndType #29.#30
(DEBUG) # 59 = Utf8 haha
(DEBUG) # 60 = Class #73
(DEBUG) # 61 = NameAndType #74.#75
(DEBUG) # 62 = Utf8 java/lang/String
(DEBUG) # 63 = Class #76
(DEBUG) # 64 = NameAndType #77.#78
(DEBUG) # 65 = NameAndType #77.#79
(DEBUG) # 66 = Utf8 java/util/ArrayList
(DEBUG) # 67 = Utf8 java/lang/ClassNotFoundException
(DEBUG) # 68 = Utf8 java/lang/RuntimeException
(DEBUG) # 69 = Utf8 Annotations
(DEBUG) # 70 = Utf8 Enum
(DEBUG) # 71 = Utf8 Interface
(DEBUG) # 72 = Utf8 java/lang/Exception
(DEBUG) # 73 = Utf8 java/lang/System
(DEBUG) # 74 = Utf8 out
(DEBUG) # 75 = Utf8 Ljava/io/PrintStream;
(DEBUG) # 76 = Utf8 java/io/PrintStream
(DEBUG) # 77 = Utf8 println
(DEBUG) # 78 = Utf8 (Z)V
(DEBUG) # 79 = Utf8 (C)V
(DEBUG) ----------------- (Annotations) static constant_pool over --------------------
(DEBUG) access_flags: 33 this_class: #14 super_class: #15
(DEBUG) Interfaces: 16
(DEBUG) field_info_size: 1
(DEBUG) i;
(DEBUG) descriptor: I
(DEBUG) flags:
(DEBUG) RuntimeVisibleAnnotations:
(DEBUG) 0: #20()
(DEBUG) RuntimeInisibleAnnotations:
(DEBUG) 0: #22(#23=s#24)
(DEBUG) 1: #25(#23=s#26,#27=@#20(),#28=[@#22(#23=s#27),@#22(#23=s#28),@#22()])
(DEBUG) method_number: 2
(DEBUG)
(DEBUG) <init>;
(DEBUG) descriptor: ()V
(DEBUG) flags:
(DEBUG) Code:
(DEBUG) stack=1, locals=1
(DEBUG) 0: aload_0
(DEBUG) 1: invokespecial
(DEBUG) 4: return
(DEBUG) LineNumberTable:
(DEBUG) line: 91, start_pc: 0
(DEBUG) RuntimeInisibleAnnotations:
(DEBUG) 0: #33()
(DEBUG)
(DEBUG) throws java/lang/RuntimeException check;
(DEBUG) descriptor: (Ljava/util/ArrayList;)Ljava/util/ArrayList;
(DEBUG) flags:
(DEBUG) Code:
(DEBUG) stack=2, locals=7
(DEBUG) 0: ldc
(DEBUG) 2: astore_2
(DEBUG) 3: getstatic #3
(DEBUG) 6: aload_2
(DEBUG) 7: instanceof
(DEBUG) 10: invokevirtual
(DEBUG) 13: iconst_0
(DEBUG) 14: istore_3
(DEBUG) 15: getstatic #3
(DEBUG) 18: iload_3
(DEBUG) 19: i2c
(DEBUG) 20: invokevirtual
(DEBUG) 23: iconst_3
(DEBUG) 24: anewarray
(DEBUG) 27: astore
(DEBUG) 29: iconst_3
(DEBUG) 30: anewarray
(DEBUG) 33: astore
(DEBUG) 35: new
(DEBUG) 38: dup
(DEBUG) 39: invokespecial
(DEBUG) 42: astore
(DEBUG) 44: new
(DEBUG) 47: dup
(DEBUG) 48: invokespecial
(DEBUG) 51: athrow
(DEBUG) 52: astore_2
(DEBUG) 53: aload_1
(DEBUG) 54: areturn
(DEBUG) Exception Table:
(DEBUG) from to target type
(DEBUG) 0 52 52 12
(DEBUG) 0 52 52 13
(DEBUG) LineNumberTable:
(DEBUG) line: 105, start_pc: 0
(DEBUG) line: 106, start_pc: 3
(DEBUG) line: 107, start_pc: 13
(DEBUG) line: 108, start_pc: 15
(DEBUG) line: 109, start_pc: 23
(DEBUG) line: 110, start_pc: 29
(DEBUG) line: 111, start_pc: 35
(DEBUG) line: 112, start_pc: 44
(DEBUG) line: 113, start_pc: 52
(DEBUG) line: 116, start_pc: 53
(DEBUG) StackMapTable: number_of_entries = 1
(DEBUG) frame_type = 116 /* stack_item */
(DEBUG) locals = [java/lang/Exception]
(DEBUG) RuntimeVisibleTypeAnnotations:
(DEBUG) #39()
(DEBUG) tag == 44 0: [offset_target] #2c
(DEBUG) #39()
(DEBUG) tag == 40 1: [localvar_target]
(DEBUG) index: 4, start_pc: 1d, length: 17
(DEBUG) #39()
(DEBUG) tag == 40 2: [localvar_target]
(DEBUG) index: 5, start_pc: 23, length: 11
(DEBUG) type_path_kind: 0; type_argument_index: 0
(DEBUG) #39()
(DEBUG) tag == 40 3: [localvar_target]
(DEBUG) index: 6, start_pc: 2c, length: 8
(DEBUG) type_path_kind: 3; type_argument_index: 0
(DEBUG) #39()
(DEBUG) tag == 40 4: [localvar_target]
(DEBUG) index: 6, start_pc: 2c, length: 8
(DEBUG) #39()
(DEBUG) tag == 42 5: [catch_target] #0
(DEBUG) #39()
(DEBUG) tag == 42 6: [catch_target] #0
(DEBUG) RuntimeInisibleTypeAnnotations:
(DEBUG) #41()
(DEBUG) tag == 43 0: [offset_target] #6
(DEBUG) #41()
(DEBUG) tag == 47 1: [type_argument_target] #12 #0
(DEBUG) Exceptions:
(DEBUG) throws java/lang/RuntimeException
(DEBUG)
(DEBUG) MethodParameters:
(DEBUG) in
(DEBUG) Signature: #47 <T:Ljava/util/ArrayList<TT;>;>(TT;)TT;
(DEBUG) RuntimeVisibleAnnotations:
(DEBUG) 0: #20()
(DEBUG) RuntimeInisibleAnnotations:
(DEBUG) 0: #22(#23=s#24)
(DEBUG) 1: #25(#23=s#26,#27=@#20(),#28=[@#22(#23=s#27),@#22(#23=s#28),@#22()])
(DEBUG) RuntimeVisibleTypeAnnotations:
(DEBUG) #39()
(DEBUG) tag == 1 0: [type_parameter_target] #0
(DEBUG) #39()
(DEBUG) tag == 12 1: [type_parameter_bound_target] #0 #0
(DEBUG) #39()
(DEBUG) tag == 12 2: [type_parameter_bound_target] #0 #0
(DEBUG) type_path_kind: 3; type_argument_index: 0
(DEBUG) #39()
(DEBUG) tag == 17 3: [throws_target] #0
(DEBUG) #39()
(DEBUG) tag == 14 4: [empty_target]
(DEBUG) #39()
(DEBUG) tag == 16 5: [formal_parameter_target] #0
(DEBUG) RuntimeInisibleTypeAnnotations:
(DEBUG) #41()
(DEBUG) tag == 1 0: [type_parameter_target] #0
(DEBUG) #48()
(DEBUG) tag == 1 1: [type_parameter_target] #0
(DEBUG) #41()
(DEBUG) tag == 14 2: [empty_target]
(DEBUG) #41()
(DEBUG) tag == 16 3: [formal_parameter_target] #0
(DEBUG) RuntimeVisibleParameterAnnotations:
(DEBUG) 0: #50()
(DEBUG) RuntimeInisibleParameterAnnotations:
(DEBUG) 0: #52()
(DEBUG)
(DEBUG) attribute_number: 5
(DEBUG) Signature: #53 <T:Ljava/lang/Object;>LEnum;LInterface;
(DEBUG) SourceFile: "Annotations.java"
(DEBUG) RuntimeVisibleAnnotations:
(DEBUG) 0: #56()
(DEBUG) RuntimeInisibleAnnotations:
(DEBUG) 0: #57()
(DEBUG) RuntimeVisibleTypeAnnotations:
(DEBUG) #39()
(DEBUG) tag == 10 0: [supertype_target] #ffff
(DEBUG) #39()
(DEBUG) tag == 10 1: [supertype_target] #0
(DEBUG) #39()
(DEBUG) tag == 0 2: [type_parameter_target] #0