RFR: 8293170: Improve encoding of the debuginfo nmethod section [v7]

[Boris Ulasevich]

On Mon, 14 Nov 2022 13:45:56 GMT, Evgeny Astigeevich <eastigeevich at openjdk.org> wrote:

>> Boris Ulasevich has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 12 commits:
>> 
>>  - adding jtreg test for CompressedSparseDataReadStream impl
>>  - align java impl to cpp impl
>>  - rewrite the SparseDataWriteStream not to use _curr_byte
>>  - introduce and call flush() excplicitly, add the gtest
>>  - minor renaming. adding encoding examples table
>>  - cleanup and rename
>>  - cleanup
>>  - rewrite code without virtual functions
>>  - warning fix and name fix
>>  - optimize the encoding
>>  - ... and 2 more: https://git.openjdk.org/jdk/compare/fd668dc4...637c94be
>
> src/hotspot/share/code/compressedStream.cpp line 225:
> 
>> 223:   memcpy(_new_buffer, _buffer, _position);
>> 224:   _buffer = _new_buffer;
>> 225:   _size   = nsize;
> 
> Signed integer overflow is UB.
> The correct assert:
> 
> assert(_size <= INT_MAX / 2, "debug data size must not exceed INT_MAX");
> int nsize = _size * 2;

OK

-------------

PR: https://git.openjdk.org/jdk/pull/10025