RFR(S) 8193318: ELF decoder should be able to use external debug info file

[Zhengyu Gu]

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
>