81c34968a7
This changes ReadOnlySpace to no longer be a PagedSpace but instead it is now a BaseSpace. BasicSpace is a new base class that Space inherits from and which has no allocation methods and does not dictate how the pages should be held. ReadOnlySpace unlike Space holds its pages as a std::vector<ReadOnlyPage>, where ReadOnlyPage directly subclasses BasicMemoryChunk, meaning they do not have prev_ and next_ pointers and cannot be held in a heap::List. This is desirable since with pointer compression we would like to remap these pages to different memory addresses which would be impossible with a heap::List. Since ReadOnlySpace no longer uses most of the code from the other Spaces it makes sense to simplify its memory allocation to use a simple bump pointer and always allocate a new page whenever an allocation exceeds the remaining space on the final page. Change-Id: Iee6d9f96cfb174b4026ee671ee4f897909b38418 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2209060 Commit-Queue: Dan Elphick <delphick@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#68137} |
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| .. | ||
| BUILD.gn | ||
| DEPS | ||
| mkgrokdump.cc | ||
| mkgrokdump.status | ||
| README | ||
| testcfg.py | ||
If you change the heap layout, expect this test to fail (in CQ). You will then need to build x64 release and run `<outdir>/mkgrokdump > tools/v8heapconst.py` to rebaseline.