RFR 8030115: [parfait] warnings from b119 for jdk.src.share.native.sun.tracing.dtrace: JNI exception pending

[serguei.spitsyn at oracle.com]

Looks good.

Thanks,
Serguei

On 7/28/14 7:08 AM, Jaroslav Bachorik wrote:
> A few readability improvements suggested by Dmitry
>
> http://cr.openjdk.java.net/~jbachorik/8030115/webrev.04
>
> -JB-
>
>
> --- snipped for brevity ---
>
>>>>>> On 2014-07-24 15:07, Jaroslav Bachorik wrote:
>>>>>>> Please, review the change for the fix of the following problem
>>>>>>>
>>>>>>> In jdk/src/share/native/sun/tracing/dtrace/JVM.c the following
>>>>>>> code is
>>>>>>> invoked in loop
>>>>>>>
>>>>>>> 198     for (i = 0; i < num_providers; ++i) {
>>>>>>> 199         JVM_DTraceProvider* p = &(jvm_providers[i]);
>>>>>>> 200         jobject provider = (*env)->GetObjectArrayElement(
>>>>>>> 201             env, providers, i);
>>>>>>> 202         readProviderData(env, provider, p);
>>>>>>> 203     }
>>>>>>>
>>>>>>> The first problem is that GetGetObjectArrayElement() call on 
>>>>>>> L200 may
>>>>>>> throw an exception which is not checked subsequently. On L202 the
>>>>>>> call
>>>>>>> to readProviderData() can also raise a Java exception without
>>>>>>> appropriate after-check. When getting back to the beginning of the
>>>>>>> loop
>>>>>>> GetObjectArrayElement() may be called with a pending exception
>>>>>>> which is
>>>>>>> deemed unsafe.
>>>>>>>
>>>>>>> The fix extracts the inner part of the loop into a separate 
>>>>>>> function
>>>>>>> where the result of each step is properly checked for pending
>>>>>>> exceptions. If there is a pending exception the loop will be
>>>>>>> interrupted, resources cleaned and
>>>>>>> Java_sun_tracing_dtrace_JVM_activate0() function will return 0
>>>>>>> with the
>>>>>>> pending exception recorded in env.
>>>>>>>
>>>>>>>
>>>>>>> Webrev: http://cr.openjdk.java.net/~jbachorik/8030115/webrev.00
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> -JB-
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>>
>>
>