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rmcilroy f4f58e31c1 [Interpreter] Optimize code of the form 'if (x === undefined)'. 
Translates code of the form 'if (x === undefined)' into the JumpIfUndefined
bytecode, and similarly for comparisons with null. Also adds bytecodes for
JumpIfNotUndefined / Null.

Moves the peephole optimization for CompareUndefined out of the peephole
optimizer and into the BytecodeGenerator, having the side-effect of enabling
it for comparisons with undefined on both side of the compare operation.

BUG=v8:6107

Review-Url: https://codereview.chromium.org/2793923002
Cr-Commit-Position: refs/heads/master@{#44341}
2017-04-03 14:17:16 +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 [gn] Enable stricter build flags 2017-03-17 15:18:18 +00:00
gypfiles [build] Make inspector the default in gyp 2017-03-30 15:08:31 +00:00
include [regexp] Add support for dotAll flag 2017-03-31 09:20:13 +00:00
infra Enable inspector on noi18n trybot to improve test coverage 2017-03-24 20:27:54 +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 [Interpreter] Optimize code of the form 'if (x === undefined)'. 2017-04-03 14:17:16 +00:00
test [Interpreter] Optimize code of the form 'if (x === undefined)'. 2017-04-03 14:17:16 +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 [tools] Directly show message from PushStackTraceAndDie in grokdump.py 2017-04-03 14:12:15 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.gitignore Alpha-sort .gitignore. 2017-03-13 06:44:25 +00:00
.gn [build] Add v8gen support for PPC/s390 architecture 2017-03-13 15:05:51 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS Migrate Number constants and undefined to C++ 2017-02-27 08:20:45 +00:00
BUILD.gn Revert "ARM64: Add NEON support" 2017-03-31 12:33:57 +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 Update V8 DEPS. 2017-04-02 03:24:16 +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 Update to OWNER files. 2017-03-21 10:01:16 +00:00
PRESUBMIT.py [test] Enforce tracker prefix for all BUG entries 2017-03-14 16:16:22 +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 Add jbroman to WATCHLISTS for src/value-serializer.*. 2017-03-28 12:51:29 +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.