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jarin ca3abde2fa [turbofan] Variable liveness analysis for deopt. 
This change introduces a liveness analyzer for local variables in frame states.

The main idea is to use the AstGraphBuilder::Environment class to build the control flow graph, and record local variable loads, stores and checkpoints in the CFG basic blocks (LivenessAnalyzerBlock class).

After the graph building finishes, we run a simple data flow analysis over the CFG to figure out liveness of each local variable at each checkpoint. Finally, we run a pass over all the checkpoints and replace dead local variables in the frame states with the 'undefined' value.

Performance numbers for Embenchen are below.

----------- box2d.js
Current --turbo-deoptimization: EmbenchenBox2d(RunTime): 11265 ms.
d8-master --turbo-deoptimization: EmbenchenBox2d(RunTime): 11768 ms.
d8-master: EmbenchenBox2d(RunTime): 10996 ms.
----------- bullet.js
Current --turbo-deoptimization: EmbenchenBullet(RunTime): 17049 ms.
d8-master --turbo-deoptimization: EmbenchenBullet(RunTime): 17384 ms.
d8-master: EmbenchenBullet(RunTime): 16153 ms.
----------- copy.js
Current --turbo-deoptimization: EmbenchenCopy(RunTime): 4877 ms.
d8-master --turbo-deoptimization: EmbenchenCopy(RunTime): 4938 ms.
d8-master: EmbenchenCopy(RunTime): 4940 ms.
----------- corrections.js
Current --turbo-deoptimization: EmbenchenCorrections(RunTime): 7068 ms.
d8-master --turbo-deoptimization: EmbenchenCorrections(RunTime): 6718 ms.
d8-master: EmbenchenCorrections(RunTime): 6858 ms.
----------- fannkuch.js
Current --turbo-deoptimization: EmbenchenFannkuch(RunTime): 4167 ms.
d8-master --turbo-deoptimization: EmbenchenFannkuch(RunTime): 4608 ms.
d8-master: EmbenchenFannkuch(RunTime): 4149 ms.
----------- fasta.js
Current --turbo-deoptimization: EmbenchenFasta(RunTime): 9981 ms.
d8-master --turbo-deoptimization: EmbenchenFasta(RunTime): 9848 ms.
d8-master: EmbenchenFasta(RunTime): 9640 ms.
----------- lua_binarytrees.js
Current --turbo-deoptimization: EmbenchenLuaBinaryTrees(RunTime): 11571 ms.
d8-master --turbo-deoptimization: EmbenchenLuaBinaryTrees(RunTime): 13089 ms.
d8-master: EmbenchenLuaBinaryTrees(RunTime): 10957 ms.
----------- memops.js
Current --turbo-deoptimization: EmbenchenMemOps(RunTime): 7766 ms.
d8-master --turbo-deoptimization: EmbenchenMemOps(RunTime): 7346 ms.
d8-master: EmbenchenMemOps(RunTime): 7738 ms.
----------- primes.js
Current --turbo-deoptimization: EmbenchenPrimes(RunTime): 7459 ms.
d8-master --turbo-deoptimization: EmbenchenPrimes(RunTime): 7453 ms.
d8-master: EmbenchenPrimes(RunTime): 7451 ms.
----------- skinning.js
Current --turbo-deoptimization: EmbenchenSkinning(RunTime): 15564 ms.
d8-master --turbo-deoptimization: EmbenchenSkinning(RunTime): 15611 ms.
d8-master: EmbenchenSkinning(RunTime): 15583 ms.
----------- zlib.js
Current --turbo-deoptimization: EmbenchenZLib(RunTime): 10825 ms.
d8-master --turbo-deoptimization: EmbenchenZLib(RunTime): 11180 ms.
d8-master: EmbenchenZLib(RunTime): 10823 ms.

BUG=

Review URL: https://codereview.chromium.org/949743002

Cr-Commit-Position: refs/heads/master@{#27232}
2015-03-17 09:38:43 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build Update V8 DEPS. 2015-03-14 18:41:41 +00:00
include add missing dcheck to ToLocalChecked 2015-03-17 09:03:50 +00:00
samples shell.cc race condition 2015-02-02 08:08:31 +00:00
src [turbofan] Variable liveness analysis for deopt. 2015-03-17 09:38:43 +00:00
test [turbofan] Variable liveness analysis for deopt. 2015-03-17 09:38:43 +00:00
testing Add linux dbg coverage to CQ. 2015-02-24 16:39:23 +00:00
third_party/binutils Ignore unsupport host architectures for binutils download. 2015-02-10 07:51:42 +00:00
tools [turbofan] Variable liveness analysis for deopt. 2015-03-17 09:38:43 +00:00
.clang-format Change clang-format config to allow for two empty lines between functions 2013-12-03 10:39:21 +00:00
.gitignore Port chromium landmines script. 2015-02-24 16:57:47 +00:00
.ycm_extra_conf.py [ycm] The YouCompleteMe configuration is not VIM specific. 2015-02-12 07:21:13 +00:00
AUTHORS Fix build on solaris platforms 2015-03-12 15:12:45 +00:00
BUILD.gn [turbofan] Variable liveness analysis for deopt. 2015-03-17 09:38:43 +00:00
ChangeLog Upgrade version and change log after branch. 2014-11-10 10:41:13 +00:00
codereview.settings Removed TRYSERVER_ROOT since this is not used anymore 2015-01-28 11:04:32 +00:00
DEPS Update V8 DEPS. 2015-03-17 04:02:43 +00:00
LICENSE Update LICENSE date. 2014-02-18 10:50:22 +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 introduce android_x64 build target 2015-03-09 03:23:12 +00:00
Makefile.android introduce android_x64 build target 2015-03-09 03:23:12 +00:00
Makefile.nacl Use the pnacl-clang toolchain for (P)NaCL builds 2014-10-06 08:10:50 +00:00
OWNERS Add Erik Arvidsson to OWNERS 2015-01-28 18:23:29 +00:00
PRESUBMIT.py Add public version macros. 2015-02-26 08:59:23 +00:00
README.md Update all DEPS to match chromium's DEPS at edb488e 2014-12-08 12:27:26 +00:00
WATCHLISTS Add myself to a watchlist for the public API. 2013-10-10 11:37:48 +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://code.google.com/p/v8/

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/*