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Comparison of a polymorphic and monomorphic value class
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| scala> class Bar(val a: Object) extends AnyVal | |
| defined class Bar | |
| scala> val x = new Bar(new Object) | |
| x: Bar = Bar@5d0b5bcb | |
| scala> :javap -v x | |
| Size 599 bytes | |
| MD5 checksum cc127130545aa10c64d151abbffcae83 | |
| Compiled from "<console>" | |
| public class | |
| SourceFile: "<console>" | |
| InnerClasses: | |
| public static #26= #23 of #25; //=class of class $line18/$read | |
| public static #26= #2 of #23; //=class of class | |
| Scala: length = 0x0 | |
| minor version: 0 | |
| major version: 50 | |
| flags: ACC_PUBLIC, ACC_SUPER | |
| Constant pool: | |
| #1 = Utf8 | |
| #2 = Class #1 // | |
| #3 = Utf8 java/lang/Object | |
| #4 = Class #3 // java/lang/Object | |
| #5 = Utf8 <console> | |
| #6 = Utf8 MODULE$ | |
| #7 = Utf8 L; | |
| #8 = Utf8 <clinit> | |
| #9 = Utf8 ()V | |
| #10 = Utf8 <init> | |
| #11 = NameAndType #10:#9 // "<init>":()V | |
| #12 = Methodref #2.#11 // ."<init>":()V | |
| #13 = Utf8 x | |
| #14 = Utf8 Ljava/lang/Object; | |
| #15 = Utf8 ()Ljava/lang/Object; | |
| #16 = NameAndType #13:#14 // x:Ljava/lang/Object; | |
| #17 = Fieldref #2.#16 // .x:Ljava/lang/Object; | |
| #18 = Utf8 this | |
| #19 = Methodref #4.#11 // java/lang/Object."<init>":()V | |
| #20 = NameAndType #6:#7 // MODULE$:L; | |
| #21 = Fieldref #2.#20 // .MODULE$:L; | |
| #22 = Utf8 | |
| #23 = Class #22 // | |
| #24 = Utf8 $line18/$read | |
| #25 = Class #24 // $line18/$read | |
| #26 = Utf8 | |
| #27 = Utf8 Code | |
| #28 = Utf8 LocalVariableTable | |
| #29 = Utf8 LineNumberTable | |
| #30 = Utf8 SourceFile | |
| #31 = Utf8 InnerClasses | |
| #32 = Utf8 Scala | |
| { | |
| public static final MODULE$; | |
| flags: ACC_PUBLIC, ACC_STATIC, ACC_FINAL | |
| public static {}; | |
| flags: ACC_PUBLIC, ACC_STATIC | |
| Code: | |
| stack=1, locals=0, args_size=0 | |
| 0: new #2 // class | |
| 3: invokespecial #12 // Method "<init>":()V | |
| 6: return | |
| public java.lang.Object x(); | |
| flags: ACC_PUBLIC | |
| Code: | |
| stack=1, locals=1, args_size=1 | |
| 0: aload_0 | |
| 1: getfield #17 // Field x:Ljava/lang/Object; | |
| 4: areturn | |
| LocalVariableTable: | |
| Start Length Slot Name Signature | |
| 0 5 0 this L; | |
| LineNumberTable: | |
| line 9: 0 | |
| public (); | |
| flags: ACC_PUBLIC | |
| Code: | |
| stack=3, locals=1, args_size=1 | |
| 0: aload_0 | |
| 1: invokespecial #19 // Method java/lang/Object."<init>":()V | |
| 4: aload_0 | |
| 5: putstatic #21 // Field MODULE$:L; | |
| 8: aload_0 | |
| 9: new #4 // class java/lang/Object | |
| 12: dup | |
| 13: invokespecial #19 // Method java/lang/Object."<init>":()V | |
| 16: putfield #17 // Field x:Ljava/lang/Object; | |
| 19: return | |
| LocalVariableTable: | |
| Start Length Slot Name Signature | |
| 0 20 0 this L; | |
| LineNumberTable: | |
| line 14: 0 | |
| line 9: 8 | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| scala> class Bar(val a: Object) extends AnyVal | |
| defined class Bar | |
| scala> val x = new Bar(new Object) | |
| x: Bar = Bar@5d0b5bcb | |
| scala> :javap -v x | |
| Size 599 bytes | |
| MD5 checksum cc127130545aa10c64d151abbffcae83 | |
| Compiled from "<console>" | |
| public class | |
| SourceFile: "<console>" | |
| InnerClasses: | |
| public static #26= #23 of #25; //=class of class $line18/$read | |
| public static #26= #2 of #23; //=class of class | |
| Scala: length = 0x0 | |
| minor version: 0 | |
| major version: 50 | |
| flags: ACC_PUBLIC, ACC_SUPER | |
| Constant pool: | |
| #1 = Utf8 | |
| #2 = Class #1 // | |
| #3 = Utf8 java/lang/Object | |
| #4 = Class #3 // java/lang/Object | |
| #5 = Utf8 <console> | |
| #6 = Utf8 MODULE$ | |
| #7 = Utf8 L; | |
| #8 = Utf8 <clinit> | |
| #9 = Utf8 ()V | |
| #10 = Utf8 <init> | |
| #11 = NameAndType #10:#9 // "<init>":()V | |
| #12 = Methodref #2.#11 // ."<init>":()V | |
| #13 = Utf8 x | |
| #14 = Utf8 Ljava/lang/Object; | |
| #15 = Utf8 ()Ljava/lang/Object; | |
| #16 = NameAndType #13:#14 // x:Ljava/lang/Object; | |
| #17 = Fieldref #2.#16 // .x:Ljava/lang/Object; | |
| #18 = Utf8 this | |
| #19 = Methodref #4.#11 // java/lang/Object."<init>":()V | |
| #20 = NameAndType #6:#7 // MODULE$:L; | |
| #21 = Fieldref #2.#20 // .MODULE$:L; | |
| #22 = Utf8 | |
| #23 = Class #22 // | |
| #24 = Utf8 $line18/$read | |
| #25 = Class #24 // $line18/$read | |
| #26 = Utf8 | |
| #27 = Utf8 Code | |
| #28 = Utf8 LocalVariableTable | |
| #29 = Utf8 LineNumberTable | |
| #30 = Utf8 SourceFile | |
| #31 = Utf8 InnerClasses | |
| #32 = Utf8 Scala | |
| { | |
| public static final MODULE$; | |
| flags: ACC_PUBLIC, ACC_STATIC, ACC_FINAL | |
| public static {}; | |
| flags: ACC_PUBLIC, ACC_STATIC | |
| Code: | |
| stack=1, locals=0, args_size=0 | |
| 0: new #2 // class | |
| 3: invokespecial #12 // Method "<init>":()V | |
| 6: return | |
| public java.lang.Object x(); | |
| flags: ACC_PUBLIC | |
| Code: | |
| stack=1, locals=1, args_size=1 | |
| 0: aload_0 | |
| 1: getfield #17 // Field x:Ljava/lang/Object; | |
| 4: areturn | |
| LocalVariableTable: | |
| Start Length Slot Name Signature | |
| 0 5 0 this L; | |
| LineNumberTable: | |
| line 9: 0 | |
| public (); | |
| flags: ACC_PUBLIC | |
| Code: | |
| stack=3, locals=1, args_size=1 | |
| 0: aload_0 | |
| 1: invokespecial #19 // Method java/lang/Object."<init>":()V | |
| 4: aload_0 | |
| 5: putstatic #21 // Field MODULE$:L; | |
| 8: aload_0 | |
| 9: new #4 // class java/lang/Object | |
| 12: dup | |
| 13: invokespecial #19 // Method java/lang/Object."<init>":()V | |
| 16: putfield #17 // Field x:Ljava/lang/Object; | |
| 19: return | |
| LocalVariableTable: | |
| Start Length Slot Name Signature | |
| 0 20 0 this L; | |
| LineNumberTable: | |
| line 14: 0 | |
| line 9: 8 | |
| } |
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