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bmeurer 9f4f582bbf [builtins] Don't canonicalize results of Math double operations. 
For Math builtins that likely yield double results, i.e. Math.sin,
Math.cos and friends, don't bother trying to canonicalize the result
to Smi. The rationale behind this is that other parts of V8 use the
HeapNumber representation as a hint to assume that certain values
should be represented as double (i.e. for the array elements kind
and for double field tracking). This way the chance that we make
the ideal decision early on is better.

For Math.abs we establish the contract that if the input value is a
Smi, then we try hard to return a Smi (doesn't work for minimal Smi
value), otherwise we preserve the HeapNumberness of the input.

Same for the generic Add, Subtract, Multiply, etc. code stubs.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2451973003
Cr-Commit-Position: refs/heads/master@{#40573}
2016-10-26 05:56:33 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build_overrides [inspector] enable inspector by default 2016-10-25 07:13:48 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [inspector] expose js_protocol.json file location in BUILD file 2016-10-12 14:11:21 +00:00
gypfiles [debugger] basic test infrastructure for new debugger test api. 2016-10-21 06:38:05 +00:00
include [wasm] Avoid double-serializing the wire bytes 2016-10-22 15:15:04 +00:00
infra [CQ] Temporarily reduce coverage bot's frequency 2016-10-19 12:13:40 +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 [builtins] Don't canonicalize results of Math double operations. 2016-10-26 05:56:33 +00:00
test [wasm] fix simd opcode read and error case for bad simd opcodes 2016-10-25 22:03:50 +00:00
testing Use GTEST_LANG_CXX11 in V8 2016-07-25 13:06:42 +00:00
third_party/binutils Update binutils version to match Chromium. 2016-07-08 07:03:29 +00:00
tools [debugger] basic test infrastructure for new debugger test api. 2016-10-21 06:38:05 +00:00
.clang-format [formatting] Remove the formatting requirement for 2 empty lines between declarations. 2016-01-25 09:50:17 +00:00
.gitignore [inspector] added closure compiler into DEPS 2016-09-23 19:05:23 +00:00
.gn Disentangle gyp and gn files 2016-09-14 19:02:41 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS [crankshaft] Eliminate unnecessary ToNumber call 2016-10-17 09:27:39 +00:00
BUILD.gn [wasm] Remove obsolete function name table 2016-10-25 09:00:09 +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. 2016-10-23 13:35:16 +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 Remove NaCl support. 2016-07-27 07:50:31 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
OWNERS Remove oth from OWNERS 2016-09-05 13:38:25 +00:00
PRESUBMIT.py Fix BUILD.gn files and add presubmit step 2016-09-19 10:59:41 +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.