RFR[S] 8209657 Refactor filemap.hpp to simplify integration with Serviceability Agent

[Ioi Lam]

On 8/21/18 1:21 PM, serguei.spitsyn at oracle.com wrote:
> Hi Ioi,
>
> Thank you for the update!
> It looks good to me.
>
> The following declarations can be aligned (no need in new webrev):
> 169 bool _file_open;
> 170 int _fd;
> 171 size_t _file_offset;

Hi Serguei,

Thanks for the review. I've fixed the indent as you suggested.

Thanks
- Ioi
> Thank you for the explanation on the typedef FileMapHeader move 
> suggestion.
> I suspected it to be the case.
>
> Thanks,
> Serguei
>
> On 8/21/18 06:19, Ioi Lam wrote:
>>
>> Hi Serguei,
>>
>> Thanks for the review. Updated webrev at
>>
>> http://cr.openjdk.java.net/~iklam/jdk12/8209657-shared-FileMapHeader-decl.v03/
>>
>>
>> On 8/21/18 1:28 AM, serguei.spitsyn at oracle.com wrote:
>>> Hi Ioi,
>>>
>>> A couple of quick minor comments...
>>>
>>>
>>> http://cr.openjdk.java.net/~iklam/jdk12/8209657-shared-FileMapHeader-decl.v02/src/hotspot/share/include/cds.h.html
>>>
>>>    31 // We should use only standard C types. Do bot use custom types such as bool, intx,
>>>   A typo: bot => not
>>>
>>
>> Fixed
>>
>>>    54 struct CDSFileMapHeaderBase {
>>>    55   unsigned int _magic;           // identify file type.
>>>    56   int          _crc;             // header crc checksum.
>>>    57   int          _version;         // must be CURRENT_CDS_ARCHIVE_VERSION
>>>    58   struct CDSFileMapRegion _space[NUM_CDS_REGIONS];
>>>    59 };
>>>   It is better to remove dots at the end of 55 and 56 to follow the 
>>> local file style.
>>>
>>>
>> Fixed
>>
>>>   This typedef can be moved from saproc.cpp, */ps_core.c to cds.h:
>>>    +typedef struct CDSFileMapHeaderBase FileMapHeader;
>>>
>>>
>> filemap.hpp declares a FileMapHeader type with many more fields that 
>> are used only by HotSpot and not by SA. That's why the struct is 
>> named CDSFileMapHeaderBase in cds.h.
>>
>> To avoid confusion, I removed the typedef and changed the SA code to 
>> use CDSFileMapHeaderBase throughout.
>>
>>>
>>> http://cr.openjdk.java.net/~iklam/jdk12/8209657-shared-FileMapHeader-decl.v02/src/jdk.hotspot.agent/macosx/native/libsaproc/ps_core.c.frames.html
>>> http://cr.openjdk.java.net/~iklam/jdk12/8209657-shared-FileMapHeader-decl.v02/src/jdk.hotspot.agent/linux/native/libsaproc/ps_core.c.frames.html
>>> 337 print_debug("%s has bad shared archive file magic number 0x%x, 
>>> expecing 0x%x\n", Original typo can be fixed: expecing => expecting
>>>
>>
>> Fixed.
>>
>> Thanks
>> - Ioi
>>
>>> Thanks,
>>> Serguei
>>>
>>>
>>> On 8/20/18 13:23, Ioi Lam wrote:
>>>> Hi,
>>>>
>>>> I've updated the webrev to merge with Calvin's change in the latest 
>>>> repo.
>>>>
>>>> http://cr.openjdk.java.net/~iklam/jdk12/8209657-shared-FileMapHeader-decl.v02/ 
>>>>
>>>>
>>>> Thanks
>>>>
>>>> - Ioi
>>>>
>>>> On 8/17/2018 2:22 PM, Ioi Lam wrote:
>>>>> [Resending to include bug number in e-mail subject line]
>>>>>
>>>>>
>>>>> https://bugs.openjdk.java.net/browse/JDK-8209657
>>>>> http://cr.openjdk.java.net/~iklam/jdk12/8209657-shared-FileMapHeader-decl.v01/ 
>>>>>
>>>>>
>>>>> Summary:
>>>>>
>>>>> The CDS FileMapHeader type was big, and was duplicated 4 times in 
>>>>> our sources.
>>>>> I moved the parts that's common to HotSpot and Serviceability 
>>>>> Agent into a new
>>>>> common header file, cds.h.
>>>>>
>>>>> I also did various clean up in filemap.cpp/hpp:
>>>>>
>>>>> - avoid using unwieldy nested types such as 
>>>>> FileMapInfo::FileMapHeader::space_info
>>>>> - added convenience function space_at(), so you have
>>>>>
>>>>>   struct FileMapInfo::FileMapHeader::space_info* si =
>>>>>         &_header->_space[i];
>>>>> =>
>>>>>   CDSFileMapRegion* si = space_at(i);
>>>>>
>>>>>
>>>>> Testing:
>>>>>
>>>>> hs tiers 1,2,3 on all supported platforms.
>>>>>
>>>>>
>>>>
>>>
>>
>

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