e1e35df329
The test for CanTreatHoleAsUndefined on keyed element access was checking for stability of Object.prototype and Array.prototype and even adding stability dependencies on both, which is too restrictive and leads to unnecessary deoptimizations (and might disable further optimization of the keyed access depending on the state of the prototype objects during optimization). This was not intended and is considered a (performance) bug. Instead use the correct approach of checking whether the receiver's prototype is one of the current Object.prototype or Array.prototype objects (since the Array protector works isolate-wide), and then check the Array protector and install an appropriate code dependency on the protector only. Bug: v8:6607 Change-Id: I0bcfe32813ca3693e7b22de31b03edb3509d0a27 Reviewed-on: https://chromium-review.googlesource.com/574849 Reviewed-by: Daniel Clifford <danno@chromium.org> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/master@{#46743} |
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| docs | ||
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| include | ||
| infra | ||
| samples | ||
| src | ||
| test | ||
| testing | ||
| third_party | ||
| tools | ||
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| .ycm_extra_conf.py | ||
| AUTHORS | ||
| BUILD.gn | ||
| ChangeLog | ||
| CODE_OF_CONDUCT.md | ||
| codereview.settings | ||
| DEPS | ||
| LICENSE | ||
| LICENSE.fdlibm | ||
| LICENSE.strongtalk | ||
| LICENSE.v8 | ||
| LICENSE.valgrind | ||
| Makefile | ||
| Makefile.android | ||
| OWNERS | ||
| PRESUBMIT.py | ||
| README.md | ||
| snapshot_toolchain.gni | ||
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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://github.com/v8/v8/wiki
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 on the V8 wiki.