要编译为常量池中MethodHandle的Java代码

我正在尝试使用具有完整源代码的Java8（未插入指令）。您可能知道，它用于修改.class，输出以

JRE/lib/ext/nashorn.jar

的形式发布

在反汇编输出时，使用

javap

：

 0: aload_0
 1: ldc           #24                 // String Function
 3: ldc           #31                 // MethodHandle invokestatic jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
 5: getstatic     #22                 // Field $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
 8: aconst_null
 9: invokespecial #34                 // Method jdk/nashorn/internal/objects/ScriptFunctionImpl."<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V

，应调用具有签名的超级构造函数：

ScriptFunctionImpl(String, MethodHandle, PropertyMap, Specialization[]) { }

我的问题是第二个参数

NativeFunction.function

，我没有可编译的源代码，用于在常量池中生成相同的

MethodHandle

  #31 = MethodHandle       #6:#30         //  invokestatic jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;

仪器的那部分是通过调用来完成的

那么，有没有一种方法可以从Java源代码构建这样的方法句柄，或者这是一种只能在字节码级别完成的特性？

完整的javap输出：

$javap -c -v NativeFunction$Constructor.class

  Last modified Apr 10, 2015; size 1161 bytes
  MD5 checksum dcae2f54643befc519a45e9ac9bc4781
final class jdk.nashorn.internal.objects.NativeFunction$Constructor extends jdk.nashorn.internal.objects.ScriptFunctionImpl
  minor version: 0
  major version: 51
  flags: ACC_FINAL
Constant pool:
   #1 = Utf8               jdk/nashorn/internal/objects/NativeFunction$Constructor
   #2 = Class              #1             //  jdk/nashorn/internal/objects/NativeFunction$Constructor
   #3 = Utf8               jdk/nashorn/internal/objects/ScriptFunctionImpl
   #4 = Class              #3             //  jdk/nashorn/internal/objects/ScriptFunctionImpl
   #5 = Utf8               $nasgenmap$
   #6 = Utf8               Ljdk/nashorn/internal/runtime/PropertyMap;
   #7 = Utf8               <clinit>
   #8 = Utf8               ()V
   #9 = Utf8               java/util/ArrayList
  #10 = Class              #9             //  java/util/ArrayList
  #11 = Utf8               <init>
  #12 = Utf8               (I)V
  #13 = NameAndType        #11:#12        //  "<init>":(I)V
  #14 = Methodref          #10.#13        //  java/util/ArrayList."<init>":(I)V
  #15 = Utf8               jdk/nashorn/internal/runtime/PropertyMap
  #16 = Class              #15            //  jdk/nashorn/internal/runtime/PropertyMap
  #17 = Utf8               newMap
  #18 = Utf8               (Ljava/util/Collection;)Ljdk/nashorn/internal/runtime/PropertyMap;
  #19 = NameAndType        #17:#18        //  newMap:(Ljava/util/Collection;)Ljdk/nashorn/internal/runtime/PropertyMap;
  #20 = Methodref          #16.#19        //  jdk/nashorn/internal/runtime/PropertyMap.newMap:(Ljava/util/Collection;)Ljdk/nashorn/internal/runtime/PropertyMap;
  #21 = NameAndType        #5:#6          //  $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
  #22 = Fieldref           #2.#21         //  jdk/nashorn/internal/objects/NativeFunction$Constructor.$nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
  #23 = Utf8               Function
  #24 = String             #23            //  Function
  #25 = Utf8               jdk/nashorn/internal/objects/NativeFunction
  #26 = Class              #25            //  jdk/nashorn/internal/objects/NativeFunction
  #27 = Utf8               function
  #28 = Utf8               (ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #29 = NameAndType        #27:#28        //  function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #30 = Methodref          #26.#29        //  jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #31 = MethodHandle       #6:#30         //  invokestatic jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #32 = Utf8               (Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
  #33 = NameAndType        #11:#32        //  "<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
  #34 = Methodref          #4.#33         //  jdk/nashorn/internal/objects/ScriptFunctionImpl."<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
  #35 = Utf8               jdk/nashorn/internal/objects/NativeFunction$Prototype
  #36 = Class              #35            //  jdk/nashorn/internal/objects/NativeFunction$Prototype
  #37 = NameAndType        #11:#8         //  "<init>":()V
  #38 = Methodref          #36.#37        //  jdk/nashorn/internal/objects/NativeFunction$Prototype."<init>":()V
  #39 = Utf8               jdk/nashorn/internal/objects/PrototypeObject
  #40 = Class              #39            //  jdk/nashorn/internal/objects/PrototypeObject
  #41 = Utf8               setConstructor
  #42 = Utf8               (Ljava/lang/Object;Ljava/lang/Object;)V
  #43 = NameAndType        #41:#42        //  setConstructor:(Ljava/lang/Object;Ljava/lang/Object;)V
  #44 = Methodref          #40.#43        //  jdk/nashorn/internal/objects/PrototypeObject.setConstructor:(Ljava/lang/Object;Ljava/lang/Object;)V
  #45 = Utf8               jdk/nashorn/internal/runtime/ScriptFunction
  #46 = Class              #45            //  jdk/nashorn/internal/runtime/ScriptFunction
  #47 = Utf8               setPrototype
  #48 = Utf8               (Ljava/lang/Object;)V
  #49 = NameAndType        #47:#48        //  setPrototype:(Ljava/lang/Object;)V
  #50 = Methodref          #46.#49        //  jdk/nashorn/internal/runtime/ScriptFunction.setPrototype:(Ljava/lang/Object;)V
  #51 = Utf8               setArity
  #52 = NameAndType        #51:#12        //  setArity:(I)V
  #53 = Methodref          #46.#52        //  jdk/nashorn/internal/runtime/ScriptFunction.setArity:(I)V
  #54 = Utf8               Code
{
  public static {};
    flags: ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: new           #10                 // class java/util/ArrayList
         3: dup
         4: iconst_1
         5: invokespecial #14                 // Method java/util/ArrayList."<init>":(I)V
         8: invokestatic  #20                 // Method jdk/nashorn/internal/runtime/PropertyMap.newMap:(Ljava/util/Collection;)Ljdk/nashorn
/internal/runtime/PropertyMap;
        11: putstatic     #22                 // Field $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
        14: return

  jdk.nashorn.internal.objects.NativeFunction$Constructor();
    flags:
    Code:
      stack=5, locals=1, args_size=1
         0: aload_0
         1: ldc           #24                 // String Function
         3: ldc           #31                 // MethodHandle invokestatic jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
         5: getstatic     #22                 // Field $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
         8: aconst_null
         9: invokespecial #34                 // Method jdk/nashorn/internal/objects/ScriptFunctionImpl."<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
        12: aload_0
        13: new           #36                 // class jdk/nashorn/internal/objects/NativeFunction$Prototype
        16: dup
        17: invokespecial #38                 // Method jdk/nashorn/internal/objects/NativeFunction$Prototype."<init>":()V
        20: dup
        21: aload_0
        22: invokestatic  #44                 // Method jdk/nashorn/internal/objects/PrototypeObject.setConstructor:(Ljava/lang/Object;Ljava/lang/Object;)V
        25: invokevirtual #50                 // Method jdk/nashorn/internal/runtime/ScriptFunction.setPrototype:(Ljava/lang/Object;)V
        28: aload_0
        29: iconst_1
        30: invokevirtual #53                 // Method jdk/nashorn/internal/runtime/ScriptFunction.setArity:(I)V
        33: return
}

$javap-c-v NativeFunction$Constructor.class
最后修改日期：2015年4月10日；大小1161字节
MD5校验和dcae2f54643befc519a45e9ac9bc4781
最后一个类jdk.nashorn.internal.objects.NativeFunction$构造函数扩展了jdk.nashorn.internal.objects.ScriptFunctionImpl
次要版本：0
主要版本：51
旗帜：ACC_决赛
固定池：
#1=Utf8 jdk/nashorn/internal/objects/NativeFunction$Constructor
#2=类#1//jdk/nashorn/internal/objects/NativeFunction$Constructor
#3=Utf8 jdk/nashorn/internal/objects/ScriptFunctionImpl
#4=类#3//jdk/nashorn/internal/objects/ScriptFunctionImpl
#5=Utf8$nasgenmap$
#6=Utf8 Ljdk/nashorn/internal/runtime/PropertyMap；
#7=Utf8
#8=Utf8（）V
#9=UTF8Java/util/ArrayList
#10=类#9//java/util/ArrayList
#11=Utf8
#12=Utf8（I）V
#13=名称和类型#11:#12/“”：（I）V
#14=Methodref#10.#13//java/util/ArrayList.“：（I）V
#15=Utf8 jdk/nashorn/internal/runtime/PropertyMap
#16=类#15//jdk/nashorn/internal/runtime/PropertyMap
#17=Utf8新映射
#18=Utf8（Ljava/util/Collection；）Ljdk/nashorn/internal/runtime/PropertyMap；
#19=名称和类型#17:#18//newMap:（Ljava/util/Collection；）Ljdk/nashorn/internal/runtime/PropertyMap；
#20=Methodref#16.#19//jdk/nashorn/internal/runtime/PropertyMap.newMap:（Ljava/util/Collection；）Ljdk/nashorn/internal/runtime/PropertyMap；
#21=名称和类型#5:#6/$nasgenmap$：Ljdk/nashorn/internal/runtime/PropertyMap；
#22=Fieldref#2.#21//jdk/nashorn/internal/objects/NativeFunction$Constructor.$nasgenmap$：Ljdk/nashorn/internal/runtime/PropertyMap；
#23=Utf8功能
#24=字符串#23//函数
#25=Utf8 jdk/nashorn/internal/objects/NativeFunction
#26=类#25//jdk/nashorn/internal/objects/NativeFunction
#27=Utf8功能
#28=Utf8（ZLjava/lang/Object；[Ljava/lang/Object；）Ljdk/nashorn/internal/runtime/ScriptFunction；
#29=名称和类型#27:#28//函数：（ZLjava/lang/Object；[Ljava/lang/Object；）Ljdk/nashorn/internal/runtime/ScriptFunction；
#30=Methodref#26.#29//jdk/nashorn/internal/objects/NativeFunction.function:（ZLjava/lang/Object；[Ljava/lang/Object；）Ljdk/nashorn/internal/runtime/ScriptFunction；
#31=MethodHandle#6:#30//invokestatic jdk/nashorn/internal/objects/NativeFunction.function:（ZLjava/lang/Object；[Ljava/lang/Object；）Ljdk/nashorn/internal/runtime/ScriptFunction；
#32=Utf8（Ljava/lang/String；Ljava/lang/invoke/MethodHandle；Ljdk/nashorn/internal/runtime/PropertyMap；[Ljdk/nashorn/internal/runtime/Specialization；）V
#33=NameAndType#11:#32/：（Ljava/lang/String；Ljava/lang/invoke/MethodHandle；Ljdk/nashorn/internal/runtime/PropertyMap；[Ljdk/nashorn/internal/runtime/specification；）V
#34=Methodref#4.#33//jdk/nashorn/internal/objects/ScriptFunctionImpl.“：（Ljava/lang/String；Ljava/lang/invoke/MethodHandle；Ljdk/nashorn/internal/runtime/PropertyMap；[Ljdk/nashorn/internal/runtime/Specialization；）V
#35=Utf8 jdk/nashorn/internal/objects/NativeFunction$Prototype
#36=类#35//jdk/nashorn/internal/objects/NativeFunction$Prototype
#37=名称和类型#11:#8/“”：（）V
#38=Methodref#36.#37//jdk/nashorn/internal/objects/NativeFunction$Prototype.“：（）V
#39=Utf8 jdk/nashorn/internal/objects/PrototypeObject
#40=类#39//jdk/nashorn/internal/objects/PrototypeObject
#41=Utf8设置构造函数
#42=Utf8（Ljava/lang/Object；Ljava/lang/Object；）V
#43=name和type#41:#42//setConstructor:（Ljava/lang/Object；Ljava/lang/Object；）V
#44=Methodref#40.#43//jdk/nashorn/internal/objects/PrototypeObject.setConstructor:（Ljava/lang/Object；Ljava/lang/Object；）V
#45=Utf8 jdk/nashorn/internal/runtime/ScriptFunction
#46=类#45//jdk/nashorn/internal/runtime/ScriptFunction
#47=Utf8设定原型
#48=Utf8（Ljava/lang/Object；）V
#49=NameAndType#47:#48//setPrototype:（Ljava/lang/Object；）V
#50=Methodref#46.#49//jdk/nashorn/internal/runtime/ScriptFunction.setPrototype:（Ljava/lang/Object；）V
#51=Utf8设定值
#52=名称和类型#51:#12//setArity:（I）V
#53=Methodref#46.#52//jdk/nashorn/internal/runtime/ScriptFunction.setArity：（I）V
#54=Utf8代码
{
公共静态{}；
标志：ACC_公共，ACC_静态
代码：
堆栈=3，局部变量=0，参数大小=0
$javap -c -v NativeFunction$Constructor.class

  Last modified Apr 10, 2015; size 1161 bytes
  MD5 checksum dcae2f54643befc519a45e9ac9bc4781
final class jdk.nashorn.internal.objects.NativeFunction$Constructor extends jdk.nashorn.internal.objects.ScriptFunctionImpl
  minor version: 0
  major version: 51
  flags: ACC_FINAL
Constant pool:
   #1 = Utf8               jdk/nashorn/internal/objects/NativeFunction$Constructor
   #2 = Class              #1             //  jdk/nashorn/internal/objects/NativeFunction$Constructor
   #3 = Utf8               jdk/nashorn/internal/objects/ScriptFunctionImpl
   #4 = Class              #3             //  jdk/nashorn/internal/objects/ScriptFunctionImpl
   #5 = Utf8               $nasgenmap$
   #6 = Utf8               Ljdk/nashorn/internal/runtime/PropertyMap;
   #7 = Utf8               <clinit>
   #8 = Utf8               ()V
   #9 = Utf8               java/util/ArrayList
  #10 = Class              #9             //  java/util/ArrayList
  #11 = Utf8               <init>
  #12 = Utf8               (I)V
  #13 = NameAndType        #11:#12        //  "<init>":(I)V
  #14 = Methodref          #10.#13        //  java/util/ArrayList."<init>":(I)V
  #15 = Utf8               jdk/nashorn/internal/runtime/PropertyMap
  #16 = Class              #15            //  jdk/nashorn/internal/runtime/PropertyMap
  #17 = Utf8               newMap
  #18 = Utf8               (Ljava/util/Collection;)Ljdk/nashorn/internal/runtime/PropertyMap;
  #19 = NameAndType        #17:#18        //  newMap:(Ljava/util/Collection;)Ljdk/nashorn/internal/runtime/PropertyMap;
  #20 = Methodref          #16.#19        //  jdk/nashorn/internal/runtime/PropertyMap.newMap:(Ljava/util/Collection;)Ljdk/nashorn/internal/runtime/PropertyMap;
  #21 = NameAndType        #5:#6          //  $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
  #22 = Fieldref           #2.#21         //  jdk/nashorn/internal/objects/NativeFunction$Constructor.$nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
  #23 = Utf8               Function
  #24 = String             #23            //  Function
  #25 = Utf8               jdk/nashorn/internal/objects/NativeFunction
  #26 = Class              #25            //  jdk/nashorn/internal/objects/NativeFunction
  #27 = Utf8               function
  #28 = Utf8               (ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #29 = NameAndType        #27:#28        //  function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #30 = Methodref          #26.#29        //  jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #31 = MethodHandle       #6:#30         //  invokestatic jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
  #32 = Utf8               (Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
  #33 = NameAndType        #11:#32        //  "<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
  #34 = Methodref          #4.#33         //  jdk/nashorn/internal/objects/ScriptFunctionImpl."<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
  #35 = Utf8               jdk/nashorn/internal/objects/NativeFunction$Prototype
  #36 = Class              #35            //  jdk/nashorn/internal/objects/NativeFunction$Prototype
  #37 = NameAndType        #11:#8         //  "<init>":()V
  #38 = Methodref          #36.#37        //  jdk/nashorn/internal/objects/NativeFunction$Prototype."<init>":()V
  #39 = Utf8               jdk/nashorn/internal/objects/PrototypeObject
  #40 = Class              #39            //  jdk/nashorn/internal/objects/PrototypeObject
  #41 = Utf8               setConstructor
  #42 = Utf8               (Ljava/lang/Object;Ljava/lang/Object;)V
  #43 = NameAndType        #41:#42        //  setConstructor:(Ljava/lang/Object;Ljava/lang/Object;)V
  #44 = Methodref          #40.#43        //  jdk/nashorn/internal/objects/PrototypeObject.setConstructor:(Ljava/lang/Object;Ljava/lang/Object;)V
  #45 = Utf8               jdk/nashorn/internal/runtime/ScriptFunction
  #46 = Class              #45            //  jdk/nashorn/internal/runtime/ScriptFunction
  #47 = Utf8               setPrototype
  #48 = Utf8               (Ljava/lang/Object;)V
  #49 = NameAndType        #47:#48        //  setPrototype:(Ljava/lang/Object;)V
  #50 = Methodref          #46.#49        //  jdk/nashorn/internal/runtime/ScriptFunction.setPrototype:(Ljava/lang/Object;)V
  #51 = Utf8               setArity
  #52 = NameAndType        #51:#12        //  setArity:(I)V
  #53 = Methodref          #46.#52        //  jdk/nashorn/internal/runtime/ScriptFunction.setArity:(I)V
  #54 = Utf8               Code
{
  public static {};
    flags: ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: new           #10                 // class java/util/ArrayList
         3: dup
         4: iconst_1
         5: invokespecial #14                 // Method java/util/ArrayList."<init>":(I)V
         8: invokestatic  #20                 // Method jdk/nashorn/internal/runtime/PropertyMap.newMap:(Ljava/util/Collection;)Ljdk/nashorn
/internal/runtime/PropertyMap;
        11: putstatic     #22                 // Field $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
        14: return

  jdk.nashorn.internal.objects.NativeFunction$Constructor();
    flags:
    Code:
      stack=5, locals=1, args_size=1
         0: aload_0
         1: ldc           #24                 // String Function
         3: ldc           #31                 // MethodHandle invokestatic jdk/nashorn/internal/objects/NativeFunction.function:(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;
         5: getstatic     #22                 // Field $nasgenmap$:Ljdk/nashorn/internal/runtime/PropertyMap;
         8: aconst_null
         9: invokespecial #34                 // Method jdk/nashorn/internal/objects/ScriptFunctionImpl."<init>":(Ljava/lang/String;Ljava/lang/invoke/MethodHandle;Ljdk/nashorn/internal/runtime/PropertyMap;[Ljdk/nashorn/internal/runtime/Specialization;)V
        12: aload_0
        13: new           #36                 // class jdk/nashorn/internal/objects/NativeFunction$Prototype
        16: dup
        17: invokespecial #38                 // Method jdk/nashorn/internal/objects/NativeFunction$Prototype."<init>":()V
        20: dup
        21: aload_0
        22: invokestatic  #44                 // Method jdk/nashorn/internal/objects/PrototypeObject.setConstructor:(Ljava/lang/Object;Ljava/lang/Object;)V
        25: invokevirtual #50                 // Method jdk/nashorn/internal/runtime/ScriptFunction.setPrototype:(Ljava/lang/Object;)V
        28: aload_0
        29: iconst_1
        30: invokevirtual #53                 // Method jdk/nashorn/internal/runtime/ScriptFunction.setArity:(I)V
        33: return
}

MethodHandles.lookup().findStatic(
  jdk.nashorn.internal.objects.NativeFunction.class, "function",
  MethodType.fromMethodDescriptorString(
   "(ZLjava/lang/Object;[Ljava/lang/Object;)Ljdk/nashorn/internal/runtime/ScriptFunction;",
   null))

private static MethodHandle MH_NativeFunction_function() {
  try {
    return MethodHandles.lookup().findStatic(
      jdk.nashorn.internal.objects.NativeFunction.class, "function",
      MethodType.fromMethodDescriptorString("(ZLjava/lang/Object;[Ljava/lang/Object;)"
        + "Ljdk/nashorn/internal/runtime/ScriptFunction;", null));
  } catch(ReflectiveOperationException ex) {
      throw new AssertionError(ex);
  }
}

super("Function", MH_NativeFunction_function(), $nasgenmap$, (Specialization[]) null);