Re: How to modify instructions in BootstrapMethods using ASM?

I am doing that now,  but I don’t see how changing the reference to the bootstrap method allows me to change the instructions of the existing bootstrap methods.

Am I missing something?

-David

> On Nov 29, 2017, at 11:09 PM, Remi Forax <[email protected]> wrote:
> 
> 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
>> 
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.


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