forked from JavaTX/JavaCompilerCore
StackMapTable Notizen
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JanUlrich
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@ -35,3 +35,9 @@
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# TODO:
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* Matrix Beispiel muss funktionieren (verschachtelter Lambda Ausdruck)
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* Automatisch Bytecode generieren, wenn alle Typen eingesetzt sind
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## StackMapTable
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* Attribute für Codeattribut
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* Wird für Sprünge im Bytecode benötigt
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* Quelle: https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.4
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@ -1,104 +0,0 @@
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Classfile /home/janulrich/Development/eclipseworkspace/JavaCompilerCore/notizen/stan/lambdaBytecode/Lambda1.class
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Last modified 20.08.2015; size 903 bytes
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MD5 checksum acb53c553588f3c919f2b0e6359bbd94
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class Lambda1
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InnerClasses:
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public static final #46= #45 of #49; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles
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BootstrapMethods:
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0: #18 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
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Method arguments:
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#19 ()V
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#20 invokestatic Lambda1.lambda$methode$0:()V
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#19 ()V
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minor version: 0
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major version: 52
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flags: ACC_SUPER
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Constant pool:
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#1 = Methodref #8.#16 // java/lang/Object."<init>":()V
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#2 = InvokeDynamic #0:#21 // #0:run:()Ljava/lang/Runnable;
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#3 = Methodref #7.#22 // Lambda1.methode:()Ljava/lang/Runnable;
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#4 = InterfaceMethodref #23.#24 // java/lang/Runnable.run:()V
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#5 = Fieldref #25.#26 // java/lang/System.out:Ljava/io/PrintStream;
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#6 = Methodref #27.#28 // java/io/PrintStream.println:()V
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#7 = Class #29 // Lambda1
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#8 = Class #30 // java/lang/Object
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#9 = Utf8 <init>
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#10 = Utf8 ()V
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#11 = Utf8 Code
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#12 = Utf8 methode
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#13 = Utf8 ()Ljava/lang/Runnable;
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#14 = Utf8 methode2
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#15 = Utf8 lambda$methode$0
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#16 = NameAndType #9:#10 // "<init>":()V
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#17 = Utf8 BootstrapMethods
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#18 = MethodHandle #6:#31 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
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#19 = MethodType #10 // ()V
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#20 = MethodHandle #6:#32 // invokestatic Lambda1.lambda$methode$0:()V
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#21 = NameAndType #33:#13 // run:()Ljava/lang/Runnable;
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#22 = NameAndType #12:#13 // methode:()Ljava/lang/Runnable;
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#23 = Class #34 // java/lang/Runnable
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#24 = NameAndType #33:#10 // run:()V
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#25 = Class #35 // java/lang/System
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#26 = NameAndType #36:#37 // out:Ljava/io/PrintStream;
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#27 = Class #38 // java/io/PrintStream
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#28 = NameAndType #39:#10 // println:()V
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#29 = Utf8 Lambda1
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#30 = Utf8 java/lang/Object
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#31 = Methodref #40.#41 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
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#32 = Methodref #7.#42 // Lambda1.lambda$methode$0:()V
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#33 = Utf8 run
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#34 = Utf8 java/lang/Runnable
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#35 = Utf8 java/lang/System
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#36 = Utf8 out
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#37 = Utf8 Ljava/io/PrintStream;
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#38 = Utf8 java/io/PrintStream
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#39 = Utf8 println
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#40 = Class #43 // java/lang/invoke/LambdaMetafactory
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#41 = NameAndType #44:#48 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
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#42 = NameAndType #15:#10 // lambda$methode$0:()V
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#43 = Utf8 java/lang/invoke/LambdaMetafactory
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#44 = Utf8 metafactory
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#45 = Class #50 // java/lang/invoke/MethodHandles$Lookup
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#46 = Utf8 Lookup
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#47 = Utf8 InnerClasses
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#48 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
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#49 = Class #51 // java/lang/invoke/MethodHandles
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#50 = Utf8 java/lang/invoke/MethodHandles$Lookup
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#51 = Utf8 java/lang/invoke/MethodHandles
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{
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Lambda1();
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Signature: ()V
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flags:
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Code:
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stack=1, locals=1, args_size=1
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0: aload_0
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1: invokespecial #1 // Method java/lang/Object."<init>":()V
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4: return
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java.lang.Runnable methode();
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Signature: ()Ljava/lang/Runnable;
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flags:
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Code:
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stack=1, locals=1, args_size=1
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0: invokedynamic #2, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable;
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5: areturn
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void methode2();
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Signature: ()V
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flags:
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Code:
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stack=1, locals=1, args_size=1
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0: aload_0
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1: invokevirtual #3 // Method methode:()Ljava/lang/Runnable;
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4: invokeinterface #4, 1 // InterfaceMethod java/lang/Runnable.run:()V
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9: return
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private static void lambda$methode$0();
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Signature: ()V
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flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
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Code:
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stack=1, locals=0, args_size=0
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0: getstatic #5 // Field java/lang/System.out:Ljava/io/PrintStream;
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3: invokevirtual #6 // Method java/io/PrintStream.println:()V
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6: return
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}
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BIN
notizen/stan/stackmaptable/.Notizen.md.swp
Normal file
BIN
notizen/stan/stackmaptable/.Notizen.md.swp
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Binary file not shown.
10
notizen/stan/stackmaptable/Notizen.md
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10
notizen/stan/stackmaptable/Notizen.md
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@ -0,0 +1,10 @@
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# StackMapTable
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* Attribute für Codeattribut
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* Wird für Sprünge im Bytecode benötigt
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* Quelle: https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.4
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## Generierung
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* StackMapTable könnte generiert werden, indem im bytecode geschaut wird, wo Sprünge vorliegen.
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* https://stackoverflow.com/questions/24927993/what-kind-of-java-code-requires-stackmap-frames#24930521
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* It is illegal to have code after an unconditional branch without a stack map frame being provided for it.
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6
notizen/stan/stackmaptable/StackMapTest.java
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6
notizen/stan/stackmaptable/StackMapTest.java
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class StackMapTest{
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void methode(){
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while(true){}
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}
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}
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8
notizen/stan/stackmaptable/StackMapTest2.java
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8
notizen/stan/stackmaptable/StackMapTest2.java
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class StackMapTest2{
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void methode(){
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Integer i = 1;
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while(System.out == null){
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i+=1;}
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}
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}
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14
notizen/stan/stackmaptable/StackMapTest3.java
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14
notizen/stan/stackmaptable/StackMapTest3.java
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class StackMapTest3{
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void methode(){
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Integer i = 1;
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while(System.out == null){
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i+=1;
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}
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System.out.println(i);
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StackMapTest3 o = new StackMapTest3();
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while(i<0){
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i++;
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}
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}
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}
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