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bmeurer cd9724d4b4 [turbofan] Utilize the fact that empty string is canonicalized. 
Since the empty string is canonical HeapObject now, we can use
this fact to optimize

  - strict equality comparisons with the empty string to a
    simple ReferenceEqual operation, and
  - optimize ToBoolean to avoid instance type checks completely.

Drive-by-fix: Allow InternalizedString for Type::HeapConstant
in the type system. This is safe, since InternalizedStrings
can be compared to other heap constants by reference (except
for non-InternalizedStrings, which are excluded from the
HeapConstant type).

BUG=v8:5267
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2681273002
Cr-Commit-Position: refs/heads/master@{#43050}
2017-02-09 07:23:08 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build_overrides Remove build_overrides/v8.gni. 2017-01-26 20:18:58 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [foozzie] Support multi-architecture builds 2017-02-02 11:32:52 +00:00
gypfiles Reland "[test] Add back lsan leak detection" 2017-02-01 10:39:28 +00:00
include Fix missing cases of empty_string canonicalization 2017-02-08 21:12:45 +00:00
infra [build] Let v8gen support mipsel architectures 2017-02-06 09:28:07 +00:00
samples Reland of land "Turn libbase into a component" (patchset #1 id:1 of https://codereview.chromium.org/2396933002/ ) 2016-10-07 07:56:52 +00:00
src [turbofan] Utilize the fact that empty string is canonicalized. 2017-02-09 07:23:08 +00:00
test [turbofan] Utilize the fact that empty string is canonicalized. 2017-02-09 07:23:08 +00:00
testing Use GTEST_LANG_CXX11 in V8 2016-07-25 13:06:42 +00:00
third_party Adapt String::find method via StringUtil adapter. 2017-02-03 22:17:24 +00:00
tools [test] Reorder test suites and variants for better parallel throughput 2017-02-08 18:48:27 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.gitignore Revert of [wasm] include JS conformance tests in Wasm mjsunit tests (patchset #5 id:80001 of https://codereview.chromium.org/2660903003/ ) 2017-01-31 19:59:30 +00:00
.gn [build] Roll build a3b623a:11a223f 2016-11-29 11:17:15 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS [counters] Add UseCounters for 'f() = 0' syntax 2016-12-27 17:48:40 +00:00
BUILD.gn [builtins] Port parameter and argument-related code stubs to CSA 2017-02-07 16:02:44 +00:00
ChangeLog [Release] Update ChangeLog file 2016-02-17 21:29:09 +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 Use v8-reviews@ for review mail, so v8-dev@ is free for dev discussions 2015-09-09 08:14:11 +00:00
DEPS Revert of test262 roll (patchset #1 id:1 of https://codereview.chromium.org/2681833003/ ) 2017-02-07 23:33:08 +00:00
LICENSE Updates to the license information of third party components. 2015-06-16 12:37:50 +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
Makefile Make enabling of CSA verifier a build-time flag 2017-01-27 11:32:27 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
OWNERS Make clemensh owner (wasm, asmjs and general) 2017-01-13 10:20:44 +00:00
PRESUBMIT.py [test] Only run presubmit for changed status files 2016-12-06 11:42:11 +00:00
README.md [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
snapshot_toolchain.gni Use clang for snapshot_toolchain by default, except on ChromeOS. 2016-08-23 14:04:27 +00:00
WATCHLISTS [inspector] added devtools-reviews@chromium.org in WATCHLISTS for inspector 2016-09-29 15:16:54 +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://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.