Stack map generation problem

[Chen Liang]

Hmm, couldn't reproduce with a local JDK mainline build (25) and the latest smallrye mutiny 2.7.0. (It also appears from bci that your example is an older version of mutiny). I changed the class java/util/ServiceLoader to Dummy in jshell and cannot reproduce this issue; cannot reproduce with stack maps recomputation either. Here's the javap output of the transformed results.

  static {};
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=3, args_size=0
         0: ldc_w         #304                // String mutiny.disableCallBackDecorators
         3: invokestatic  #306                // Method java/lang/Boolean.getBoolean:(Ljava/lang/String;)Z
         6: putstatic     #203                // Field DISABLE_CALLBACK_DECORATORS:Z
         9: ldc_w         #312                // class io/smallrye/mutiny/infrastructure/ExecutorConfiguration
        12: invokestatic  #561                // Method Dummy.load:(Ljava/lang/Class;)Ljava/util/ServiceLoader;
        15: astore_0
        16: aload_0
        17: invokevirtual #212                // Method java/util/ServiceLoader.iterator:()Ljava/util/Iterator;
        20: astore_1
        21: aload_1
        22: invokeinterface #216,  1          // InterfaceMethod java/util/Iterator.hasNext:()Z
        27: ifeq          61
        30: aload_1
        31: invokeinterface #221,  1          // InterfaceMethod java/util/Iterator.next:()Ljava/lang/Object;
        36: checkcast     #312                // class io/smallrye/mutiny/infrastructure/ExecutorConfiguration
        39: astore_2
        40: aload_2
        41: invokeinterface #314,  1          // InterfaceMethod io/smallrye/mutiny/infrastructure/ExecutorConfiguration.getDefaultWorkerExecutor:()Ljava/util/concurrent/Executor;
        46: ldc_w         #318                // String executor
        49: invokestatic  #167                // Method io/smallrye/mutiny/helpers/ParameterValidation.nonNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
        52: checkcast     #320                // class java/util/concurrent/Executor
        55: invokestatic  #32                 // Method setDefaultExecutor:(Ljava/util/concurrent/Executor;)V
        58: goto          64
        61: invokestatic  #322                // Method setDefaultExecutor:()V
        64: invokestatic  #324                // Method reload:()V
        67: invokestatic  #327                // Method resetCanCallerThreadBeBlockedSupplier:()V
        70: getstatic     #241                // Field io/smallrye/mutiny/infrastructure/Infrastructure$PrintAndDumpThrowableConsumer.INSTANCE:Lio/smallrye/mutiny/infrastructure/Infrastructure$PrintAndDumpThrowableConsumer;
        73: putstatic     #155                // Field droppedExceptionHandler:Ljava/util/function/Consumer;
        76: getstatic     #271                // Field io/smallrye/mutiny/infrastructure/Infrastructure$PrintOperatorEventOperatorLogger.INSTANCE:Lio/smallrye/mutiny/infrastructure/Infrastructure$PrintOperatorEventOperatorLogger;
        79: putstatic     #260                // Field operatorLogger:Lio/smallrye/mutiny/infrastructure/Infrastructure$OperatorLogger;
        82: sipush        128
        85: putstatic     #16                 // Field multiOverflowDefaultBufferSize:I
        88: bipush        32
        90: putstatic     #20                 // Field bufferSizeXs:I
        93: sipush        256
        96: putstatic     #23                 // Field bufferSizeS:I
        99: return
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
           40      18     2  next   Lio/smallrye/mutiny/infrastructure/ExecutorConfiguration;
           16      54     0 executorLoader   Ljava/util/ServiceLoader;
           21      49     1 iterator   Ljava/util/Iterator;
      LocalVariableTypeTable:
        Start  Length  Slot  Name   Signature
           16      54     0 executorLoader   Ljava/util/ServiceLoader<Lio/smallrye/mutiny/infrastructure/ExecutorConfiguration;>;
           21      49     1 iterator   Ljava/util/Iterator<Lio/smallrye/mutiny/infrastructure/ExecutorConfiguration;>;
      LineNumberTable:
        line 39: 0
        line 42: 9
        line 43: 16
        line 44: 21
        line 45: 30
        line 46: 40
        line 47: 58
        line 48: 61
        line 51: 64
        line 53: 67
        line 63: 70
        line 65: 76
        line 67: 82
        line 69: 88
        line 70: 93
      StackMapTable: number_of_entries = 2
        frame_type = 253 /* append */
          offset_delta = 61
          locals = [ class java/util/ServiceLoader, class java/util/Iterator ]
        frame_type = 2 /* same */

Regards, Chen

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