什么是ASM Visitor方法在catch上被要求进行类型注释

问题描述

我有以下代码段，我使用ASM进行了分析

I have the following code snippet, which I analyze with ASM

   try{
    } catch (@TypeAnno7 RuntimeException re){

    }

我找不到为Annotation调用的正确方法.我认为 MethodVisitor.visitTryCatchAnnotation 可以解决问题，但不会被调用.

I can't find the right method that gets called for the Annotation. I thought MethodVisitor.visitTryCatchAnnotation would do the trick, but it doesn't get called.

那么:使用的正确方法是什么?所述方法调用哪种代码?

So: what is the correct method used? And for what kind of code does the method mentioned get called?

推荐答案

除非try主体包含一些代码，否则Java编译器不会为try/catch生成任何字节码(否则，catch块将永远无法运行，因此一种消除无效代码的形式)，您可以使用javac -p进行验证.将一些代码添加到try主体中，然后应调用visitTryCatchAnnotation.

The Java compiler does not generate any bytecode for a try/catch unless the try body contains some code (otherwise, the catch block could never actually run, so it's a form of dead code elimination), which you can verify using javac -p. Add some code to the try body, and then the visitTryCatchAnnotation should be called.

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