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[heap] Add TPH-related flag-implication rules

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This disables the following features for --enable-third-party-heap:
- inline allocation: all allocation are directed to runtime for now
  until we have support for TPH inline allocation.
- allocation site pretenuring: this feature relies on ephemeral
  memento objects placed after ordinary objects and is tightly coupled
  with V8's GC.
- allocation folding in TurboFan: this feature assumes that objects
  of different size and type can be allocated on the same page using
  bump-pointer allocation.

Bug: v8:9533
Change-Id: Idbdf1dac566f37db379e5d4b43e0741886f4e69b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2463004
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70468}
This commit is contained in:
Javad Amiri 2020-10-09 09:38:40 +11:00 committed by Commit Bot
parent 0040d5cdf1
commit 7015a0d17d
2 changed files with 5 additions and 0 deletions
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1
AUTHORS
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@ -117,6 +117,7 @@ Janusz Majnert <jmajnert@gmail.com>
Jay Freeman <saurik@saurik.com>
James Pike <g00gle@chilon.net>
James M Snell <jasnell@gmail.com>
Javad Amiri <javad.amiri@anu.edu.au>
Jianghua Yang <jianghua.yjh@alibaba-inc.com>
Jiawen Geng <technicalcute@gmail.com>
Jiaxun Yang <jiaxun.yang@flygoat.com>

4
src/flags/flag-definitions.h
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@ -365,6 +365,10 @@ DEFINE_IMPLICATION(lite_mode, optimize_for_size)
#define V8_ENABLE_THIRD_PARTY_HEAP_BOOL false
#endif
DEFINE_NEG_IMPLICATION(enable_third_party_heap, inline_new)
DEFINE_NEG_IMPLICATION(enable_third_party_heap, allocation_site_pretenuring)
DEFINE_NEG_IMPLICATION(enable_third_party_heap, turbo_allocation_folding)
DEFINE_BOOL_READONLY(enable_third_party_heap, V8_ENABLE_THIRD_PARTY_HEAP_BOOL,
"Use third-party heap")