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04bb707e52
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Georg Neis 04bb707e52 [turbofan] Preprocess feedback for global accesses (partially) 
Main changes:
- Rename ProcessedFeedback to ElementAccessFeedback and introduce a base class
  with the old name ProcessedFeedback.
- Introduce another kind of ProcessedFeedback, namely GlobalAccessFeedback for
  the LoadGlobal/StoreGlobal IC. It's either a PropertyCell or a script context
  slot.
- Produce such processed feedback in the serializer, when visiting LdaGlobal and
  similar bytecodes.
- Consume it, and disallow heap access, in JSNativeContextSpecialization's
  ReduceJSLoadGlobal and ReduceJSStoreGlobal (for --concurrent-inlining).

Minor changes:
- Introduce a FeedbackSource class (pair of FeedbackVector and FeedbackSlot)
  that is used as the key of the processed feedback hash table. We already have
  two similar classes, FeedbackNexus and VectorSlotPair, but both are unsuitable
  for technical reasons (e.g. FeedbackNexus construction accesses the heap).
  Eventually we should remove VectorSlotPair.
- Processed feedback is now returned as a pointer, which is nullptr if the
  original feedback wasn't interesting (e.g. megamorphic).

The title says "partially" because the CL doesn't yet take into account named
accesses where the receiver happens to be the global proxy.

Bug: v8:7790
Change-Id: I4404d98636b91a8f2d5667115944bae4773a4770
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1518184
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60240}
2019-03-14 14:42:48 +00:00
benchmarks [test] Ensure random generator in JSTests does not use float arithmetic 2018-12-17 10:05:08 +00:00
build_overrides [ndk] Change android ndk root for v8 2018-01-11 08:10:33 +00:00
custom_deps [build] Add common directory for custom deps 2018-06-08 19:23:02 +00:00
docs [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
gni unified-heap: Add GN flag for full heap snapshots 2019-03-06 09:39:22 +00:00
include [api] Add unique_ptr constructor for StreamedSource 2019-03-14 09:42:26 +00:00
infra Revert "[ptr-compr][x64] Temporarily enable pointer compression on x64" 2019-03-14 09:28:48 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src [turbofan] Preprocess feedback for global accesses (partially) 2019-03-14 14:42:48 +00:00
test [wasm] Add test for element section with non-zero table indices 2019-03-14 14:28:06 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [DevTools] Roll inspector_protocol to a7423d8ca937e658ab3b85e3b02676bced145ba6. 2019-03-13 18:19:28 +00:00
tools [gcmole] Provide packaging script for gcmole deployment. 2019-03-14 13:50:30 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +00:00
.editorconfig Add .editorconfig 2017-07-28 13:39:24 +00:00
.git-blame-ignore-revs [build] Add DEPS formatting to hyper-blame 2017-10-09 14:08:45 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore Add .ccls-cache to .gitignore 2019-02-26 10:32:45 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Correctly identify and report test crashes and infra failures 2018-10-30 15:05:40 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS Use inherited ctors for MacroAssembler and TurboAssembler 2019-03-08 09:31:30 +00:00
BUILD.gn [build] Suppress UBSan alignment checks in pointer compression 2019-03-14 10:48:17 +00:00
ChangeLog [release] Merge ChangeLog back to master 2018-12-07 15:41:59 +00:00
CODE_OF_CONDUCT.md Explicitly state that the Chromium Code of Conduct also applies to V8 2016-03-02 09:51:24 +00:00
codereview.settings Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
DEPS Update V8 DEPS. 2019-03-14 04:04:15 +00:00
LICENSE Add antlr4 runtime library to support Torque 2018-04-10 10:01:01 +00:00
LICENSE.fdlibm Add LICENSE.fdlibm for all the fdlibm imported sources. 2016-06-09 07:17:03 +00:00
LICENSE.strongtalk Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.v8 Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.valgrind Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
OWNERS Reduce wasm OWNERS to current team members 2018-10-15 14:47:49 +00:00
PRESUBMIT.py Revert "[torque] Temporarily disable torque format check to pass presubmit" 2019-02-20 14:07:17 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
snapshot_toolchain.gni Reland "Add Windows ARM64 ABI support to V8" 2018-10-24 19:46:36 +00:00
WATCHLISTS Update WATCHLIST wrt yangguo 2018-11-23 08:29:12 +00:00

README.md

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

V8 is written in C++ and is used in Google Chrome, the open source browser from Google.

V8 can run standalone, or can be embedded into any C++ application.

V8 Project page: https://v8.dev/docs

Getting the Code

Checkout depot tools, and run

    fetch v8

This will checkout V8 into the directory v8 and fetch all of its dependencies. To stay up to date, run

    git pull origin
    gclient sync

For fetching all branches, add the following into your remote configuration in .git/config:

    fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
    fetch = +refs/tags/*:refs/tags/*

Contributing

Please follow the instructions mentioned at v8.dev/docs/contribute.