Re: How to modify instructions in BootstrapMethods using ASM?

Hi,
those constants are referenced by some invokedynamic instructions in the bytecode.
When you see an invokedynamic instruction with the MethodVisitor at that point, you can change the reference to the bootstrap method you want.

cheers,
Rémi 



On November 29, 2017 9:54:48 PM GMT+01:00, David Dunkle <[email protected]> wrote:
>After compiling with Java 8 and dumping the resulting class files with
>javap, I see this, of which I am only showing the first 2 items:
>
>BootstrapMethods:
>
>  0: #174 invokestatic
>java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
>
>    Method arguments:
>
>      #175 (Ljava/lang/Object;)Z
>
>      #179 invokestatic
>llllll/lallll.lambda$printPersons$0:(Lllllll/lallll;)Z
>
>      #180 (Lllllll/lallll;)Z
>
>  1: #174 invokestatic
>java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$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:
>
>      #175 (Ljava/lang/Object;)Z
>
>      #191 invokestatic
>llllll/lallll.lambda$printPersons$1:(Lllllll/lallll;)Z
>
>      #180 (Lllllll/lallll;)Z
>
>  2: #174 invokestatic
>java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/inv
>
>
>Can I use ASM to visit the instructions in these bootstrap methods and
>change, say, the names of the methods being called using invokestatic
>instructions above?
>
>Apparently these methods are not part of the normal methods of a class,
>and
>I haven't had any luck visiting them using standard ASM class and
>method
>techniques.
>
>thanks,
>
>-David

-- 
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