diff --git a/notizen/stan/lambdaBytecode/Notizen.md b/notizen/stan/lambdaBytecode/Notizen.md index 661abd82..c234266b 100644 --- a/notizen/stan/lambdaBytecode/Notizen.md +++ b/notizen/stan/lambdaBytecode/Notizen.md @@ -35,3 +35,9 @@ # TODO: * Matrix Beispiel muss funktionieren (verschachtelter Lambda Ausdruck) * Automatisch Bytecode generieren, wenn alle Typen eingesetzt sind + +## StackMapTable +* Attribute für Codeattribut +* Wird für Sprünge im Bytecode benötigt +* Quelle: https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.4 + diff --git a/notizen/stan/lambdaBytecode/cat b/notizen/stan/lambdaBytecode/cat deleted file mode 100644 index f886214b..00000000 --- a/notizen/stan/lambdaBytecode/cat +++ /dev/null @@ -1,104 +0,0 @@ -Classfile /home/janulrich/Development/eclipseworkspace/JavaCompilerCore/notizen/stan/lambdaBytecode/Lambda1.class - Last modified 20.08.2015; size 903 bytes - MD5 checksum acb53c553588f3c919f2b0e6359bbd94 -class Lambda1 - InnerClasses: - public static final #46= #45 of #49; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles - BootstrapMethods: - 0: #18 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; - Method arguments: - #19 ()V - #20 invokestatic Lambda1.lambda$methode$0:()V - #19 ()V - minor version: 0 - major version: 52 - flags: ACC_SUPER -Constant pool: - #1 = Methodref #8.#16 // java/lang/Object."":()V - #2 = InvokeDynamic #0:#21 // #0:run:()Ljava/lang/Runnable; - #3 = Methodref #7.#22 // Lambda1.methode:()Ljava/lang/Runnable; - #4 = InterfaceMethodref #23.#24 // java/lang/Runnable.run:()V - #5 = Fieldref #25.#26 // java/lang/System.out:Ljava/io/PrintStream; - #6 = Methodref #27.#28 // java/io/PrintStream.println:()V - #7 = Class #29 // Lambda1 - #8 = Class #30 // java/lang/Object - #9 = Utf8 - #10 = Utf8 ()V - #11 = Utf8 Code - #12 = Utf8 methode - #13 = Utf8 ()Ljava/lang/Runnable; - #14 = Utf8 methode2 - #15 = Utf8 lambda$methode$0 - #16 = NameAndType #9:#10 // "":()V - #17 = Utf8 BootstrapMethods - #18 = MethodHandle #6:#31 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; - #19 = MethodType #10 // ()V - #20 = MethodHandle #6:#32 // invokestatic Lambda1.lambda$methode$0:()V - #21 = NameAndType #33:#13 // run:()Ljava/lang/Runnable; - #22 = NameAndType #12:#13 // methode:()Ljava/lang/Runnable; - #23 = Class #34 // java/lang/Runnable - #24 = NameAndType #33:#10 // run:()V - #25 = Class #35 // java/lang/System - #26 = NameAndType #36:#37 // out:Ljava/io/PrintStream; - #27 = Class #38 // java/io/PrintStream - #28 = NameAndType #39:#10 // println:()V - #29 = Utf8 Lambda1 - #30 = Utf8 java/lang/Object - #31 = Methodref #40.#41 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; - #32 = Methodref #7.#42 // Lambda1.lambda$methode$0:()V - #33 = Utf8 run - #34 = Utf8 java/lang/Runnable - #35 = Utf8 java/lang/System - #36 = Utf8 out - #37 = Utf8 Ljava/io/PrintStream; - #38 = Utf8 java/io/PrintStream - #39 = Utf8 println - #40 = Class #43 // java/lang/invoke/LambdaMetafactory - #41 = NameAndType #44:#48 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; - #42 = NameAndType #15:#10 // lambda$methode$0:()V - #43 = Utf8 java/lang/invoke/LambdaMetafactory - #44 = Utf8 metafactory - #45 = Class #50 // java/lang/invoke/MethodHandles$Lookup - #46 = Utf8 Lookup - #47 = Utf8 InnerClasses - #48 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; - #49 = Class #51 // java/lang/invoke/MethodHandles - #50 = Utf8 java/lang/invoke/MethodHandles$Lookup - #51 = Utf8 java/lang/invoke/MethodHandles -{ - Lambda1(); - Signature: ()V - flags: - Code: - stack=1, locals=1, args_size=1 - 0: aload_0 - 1: invokespecial #1 // Method java/lang/Object."":()V - 4: return - - java.lang.Runnable methode(); - Signature: ()Ljava/lang/Runnable; - flags: - Code: - stack=1, locals=1, args_size=1 - 0: invokedynamic #2, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; - 5: areturn - - void methode2(); - Signature: ()V - flags: - Code: - stack=1, locals=1, args_size=1 - 0: aload_0 - 1: invokevirtual #3 // Method methode:()Ljava/lang/Runnable; - 4: invokeinterface #4, 1 // InterfaceMethod java/lang/Runnable.run:()V - 9: return - - private static void lambda$methode$0(); - Signature: ()V - flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC - Code: - stack=1, locals=0, args_size=0 - 0: getstatic #5 // Field java/lang/System.out:Ljava/io/PrintStream; - 3: invokevirtual #6 // Method java/io/PrintStream.println:()V - 6: return -} diff --git a/notizen/stan/stackmaptable/.Notizen.md.swp b/notizen/stan/stackmaptable/.Notizen.md.swp new file mode 100644 index 00000000..61f9c4c6 Binary files /dev/null and b/notizen/stan/stackmaptable/.Notizen.md.swp differ diff --git a/notizen/stan/stackmaptable/Notizen.md b/notizen/stan/stackmaptable/Notizen.md new file mode 100644 index 00000000..4050403e --- /dev/null +++ b/notizen/stan/stackmaptable/Notizen.md @@ -0,0 +1,10 @@ +# StackMapTable +* Attribute für Codeattribut +* Wird für Sprünge im Bytecode benötigt +* Quelle: https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.4 + +## Generierung +* StackMapTable könnte generiert werden, indem im bytecode geschaut wird, wo Sprünge vorliegen. +* https://stackoverflow.com/questions/24927993/what-kind-of-java-code-requires-stackmap-frames#24930521 + * It is illegal to have code after an unconditional branch without a stack map frame being provided for it. + diff --git a/notizen/stan/stackmaptable/StackMapTest.java b/notizen/stan/stackmaptable/StackMapTest.java new file mode 100644 index 00000000..b2e02b35 --- /dev/null +++ b/notizen/stan/stackmaptable/StackMapTest.java @@ -0,0 +1,6 @@ +class StackMapTest{ + +void methode(){ +while(true){} +} +} diff --git a/notizen/stan/stackmaptable/StackMapTest2.java b/notizen/stan/stackmaptable/StackMapTest2.java new file mode 100644 index 00000000..b0851b00 --- /dev/null +++ b/notizen/stan/stackmaptable/StackMapTest2.java @@ -0,0 +1,8 @@ +class StackMapTest2{ + +void methode(){ +Integer i = 1; +while(System.out == null){ +i+=1;} +} +} diff --git a/notizen/stan/stackmaptable/StackMapTest3.java b/notizen/stan/stackmaptable/StackMapTest3.java new file mode 100644 index 00000000..420ac3c6 --- /dev/null +++ b/notizen/stan/stackmaptable/StackMapTest3.java @@ -0,0 +1,14 @@ +class StackMapTest3{ + +void methode(){ +Integer i = 1; +while(System.out == null){ +i+=1; +} +System.out.println(i); +StackMapTest3 o = new StackMapTest3(); +while(i<0){ +i++; +} +} +}