479bfdb11b
In Blink's version of Oilpan, GCInfo objects would reside in .bss and a table would translate between an index and the .bss address. Upon retrieving a GCInfoIndex, the slow path merely passes a .bss pointer to a slow path setup method to create the table mapping. In cppgc, we set up GCInfo entries directly in the table. This is slightly faster for actually using GCInfo objects as there's no indirection between table and .bss, and it also saves one pointer (the indirection) per type that is set up. The downside of this approach is that individual components of a GCInfo objects, that are all type-dependent, need to be passed to the conditional setup method. Since GCInfo indices must be retrieved on each allocation, this pollutes the fast path with additional instructions. However, GCInfo components are actually known at compile-time for many objects. In such cases, we can use a compile-time static dispatch to encode the known parameters in different functions. This saves around 40KiB of memory on ChromePublic.apk and also creates a more compact fast path for allocation. Bug: chromium:1238884, chromium:1056170 Change-Id: Iedd809a8baefcc02f131d2b2c77d341b0abe43bb Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3094007 Reviewed-by: Anton Bikineev <bikineev@chromium.org> Reviewed-by: Omer Katz <omerkatz@chromium.org> Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#76291} |
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|---|---|---|
| .. | ||
| internal | ||
| allocation.h | ||
| common.h | ||
| cross-thread-persistent.h | ||
| custom-space.h | ||
| default-platform.h | ||
| DEPS | ||
| ephemeron-pair.h | ||
| explicit-management.h | ||
| garbage-collected.h | ||
| heap-consistency.h | ||
| heap-state.h | ||
| heap-statistics.h | ||
| heap.h | ||
| liveness-broker.h | ||
| macros.h | ||
| member.h | ||
| name-provider.h | ||
| object-size-trait.h | ||
| OWNERS | ||
| persistent.h | ||
| platform.h | ||
| prefinalizer.h | ||
| process-heap-statistics.h | ||
| README.md | ||
| sentinel-pointer.h | ||
| source-location.h | ||
| testing.h | ||
| trace-trait.h | ||
| type-traits.h | ||
| visitor.h | ||
C++ Garbage Collection
This directory provides an open-source garbage collection library for C++.
The library is under construction, meaning that all APIs in this directory are incomplete and considered unstable and should not be used.