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bjaideep 544308b8f7 PPC/s390: [wasm] TrapIf and TrapUnless TurboFan operators implemented on arm. 
Port ca8d3ba718

Original Commit Message:

    Original commit message:
    [wasm] Introduce the TrapIf and TrapUnless operators to generate trap code.

    Some instructions in WebAssembly trap for some inputs, which means that the
    execution is terminated and (at least at the moment) a JavaScript exception is
    thrown. Examples for traps are out-of-bounds memory accesses, or integer
    divisions by zero.

    Without the TrapIf and TrapUnless operators trap check in WebAssembly introduces 5
    TurboFan nodes (branch, if_true, if_false, trap-reason constant, trap-position
    constant), in addition to the trap condition itself. Additionally, each
    WebAssembly function has four TurboFan nodes (merge, effect_phi, 2 phis) whose
    number of inputs is linear to the number of trap checks in the function.
    Especially for functions with high numbers of trap checks we observe a
    significant slowdown in compilation time, down to 0.22 MiB/s in the sqlite
    benchmark instead of the average of 3 MiB/s in other benchmarks. By introducing
    a TrapIf common operator only a single node is necessary per trap check, in
    addition to the trap condition. Also the nodes which are shared between trap
    checks (merge, effect_phi, 2 phis) would disappear. First measurements suggest a
    speedup of 30-50% on average.

    This CL only implements TrapIf and TrapUnless on x64. The implementation is also
    hidden behind the --wasm-trap-if flag.

    Please take a special look at how the source position is transfered from the
    instruction selector to the code generator, and at the context that is used for
    the runtime call.

R=ahaas@chromium.org, titzer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2666433002
Cr-Commit-Position: refs/heads/master@{#42793}
2017-01-30 21:41:46 +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 Remove build_overrides/v8.gni. 2017-01-26 20:18:58 +00:00
gypfiles Make enabling of CSA verifier a build-time flag 2017-01-27 11:32:27 +00:00
include [d8] Use ValueSerializer for postMessage (instead of ad-hoc serializer) 2017-01-27 20:15:37 +00:00
infra Enable gerrit-based CQ for v8 2017-01-30 21:24:35 +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 PPC/s390: [wasm] TrapIf and TrapUnless TurboFan operators implemented on arm. 2017-01-30 21:41:46 +00:00
test Revert of ValueSerializer: Distinguish between 'undefined' and an absent property. (patchset #2 id:20001 of https://codereview.chromium.org/2660093002/ ) 2017-01-30 19:35:28 +00:00
testing Use GTEST_LANG_CXX11 in V8 2016-07-25 13:06:42 +00:00
third_party Adapt StringBuilder's append and toString methods via StringUtil helper. 2017-01-27 21:11:15 +00:00
tools Whitespace change to check CQ 2017-01-30 19:45:47 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.gitignore Do not ignore inspector_protocol and binutils directories 2017-01-16 13:22:00 +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 [TypeFeedbackVector] Combine the literals array and the feedback vector. 2017-01-30 12:31:35 +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. 2017-01-29 04:25:52 +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.