RFR(S) 8193318: ELF decoder should be able to use external debug info file
coleen.phillimore at oracle.com
coleen.phillimore at oracle.com
Wed Mar 14 11:52:35 UTC 2018
Hi, I looked at this and I really wasn't happy with all this extra code
going into the JVM. And I don't know this code. There's a large hex
table in this file:
http://cr.openjdk.java.net/~zgu/8193318/webrev.00/src/hotspot/os/linux/decoder_linux.cpp.udiff.html
This seems like something that will be painful to maintain. Can the SA
be used for the cases where the binary is stripped? I believe that
Oracle ships with minimal stripping so that we have these symbols, why
don't all suppliers? I don't really like this change.
Thanks,
Coleen
On 3/8/18 11:12 AM, Zhengyu Gu wrote:
> Ping! I can get formal review?
>
> Thanks,
>
> -Zhengyu
>
>
> On 02/23/2018 12:26 PM, Zhengyu Gu wrote:
>> Thanks, Aleksey.
>>
>> On 02/23/2018 12:01 PM, Aleksey Shipilev wrote:
>>> On 02/15/2018 06:59 PM, Zhengyu Gu wrote:
>>>> This Linux only patch allows OpenJDK Linux distributions, which
>>>> strip out debug symbols in
>>>> production bundles, to use external debuginfo bundles, if present,
>>>> to decode stacks.
>>>>
>>>> The implementation mirrors SA implementation [1][2]. It has minimal
>>>> impact to Oracle's JDK, which
>>>> always contains symbol tables.
>>>>
>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8193318
>>>> Webrev: http://cr.openjdk.java.net/~zgu/8193318/webrev.00/
>>>
>>> Looks OK on my untrained eye.
>>>
>>> *) I am wondering if we can merge the existing implementation in
>>> src/jdk.hotspot.agent/linux/native/libsaproc/symtab.c and this
>>> mirror implementation in
>>> src/hotspot/os/linux/decoder_linux.cpp? Notably, moving
>>> gnu_debuglink_crc32 to some shared file
>>> would trim down the change.
>>
>> Yes, but I don't know if there is a way.
>>
>>>
>>> Andrew Haley knows this better, as he is the author of the related
>>> change.
>>
>> Cc'ed Andrew Haley.
>>
>> -Zhengyu
>>
>>
>>
>>>
>>> Thanks,
>>> -Aleksey
>>>
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