Hi,
I am trying to trace into the method handle linking code. I have a
program like this:
// HelloHM.java:8 mh.invokeExact("yo!");
23: aload_3;
24: ldc #9; // String "yo!";
26: invokevirtual #10; // Method
java/lang/invoke/MethodHandle.invokeExact:"(Ljava/lang/String;)V";
I want to be able to set a break point at bytecode 26, do a single step,
and then automatically land into the first bytecode of
java.lang.invoke.MethodHandleNatives.linkMethod
Well, I can't even figure out a way to display bytecodes inside eclipse,
or single step a single bytecode.
Also, I tried setting a breakpoint at MethodHandleNatives.linkMethodbut
eclipse simply ignores that. (I can set normal break points in my test
program's Java source code view).
So am I out of luck? Do I need to fall back to println() or jdb?
jdb is slightly better -- it doesn't allow single stepping bytecodes, or
break at a specific bytecode. I can do this
main[1] stop at HelloMH:8
main[1] cont
Breakpoint hit: "thread=main", HelloMH.main(), line=8 bci=23
8 mh.invokeExact("yo!");
main[1] step
>
Step completed: "thread=main",
jdk.internal.misc.SharedSecrets.setJavaLangInvokeAccess(), line=99 bci=1
main[1] where
[1] jdk.internal.misc.SharedSecrets.setJavaLangInvokeAccess
(SharedSecrets.java:99)
[2] java.lang.invoke.MethodHandleImpl.<clinit>
(MethodHandleImpl.java:1,778)
[3] java.lang.invoke.Invokers.checkCustomized (Invokers.java:571)
[4] java.lang.invoke.LambdaForm$MH.1359044626.invokeExact_MT (null)
[5] HelloMH.main (HelloMH.java:8)
But jdb's idea of "step" completely ignores the MH linking code inside
MethodHandleNatives.linkMethod. So I have to resort to manually setting
a break point at MethodHandleNatives.linkMethod.
Thanks
- Ioi
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