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Maya Lekova 2f530d5c17 Revert "[cpu-profiler] Fix stack iterability for fast C calls with no exit frame" 
This reverts commit d5f4a33eb8.

Reason for revert: Seems to cause a no snapshot build failure - https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux%20-%20nosnap%20-%20debug/21967

Original change's description:
> [cpu-profiler] Fix stack iterability for fast C calls with no exit frame
> 
> Before fast C calls, store the current FP and PC on the isolate. When
> iterating frames in SafeStackFrameIterator, check if these fields are
> set and start iterating at the calling frame's FP instead of the current
> FP, which will be in C++ code. We need to do this because c_entry_fp is
> not set on the Isolate for Fast-C-Calls because we don't build an exit
> frame.
> 
> This change makes stack samples that occur within 'Fast-C-Calls'
> iterable, meaning we can properly attribute ticks within the JS caller.
> 
> Fast-C-Calls can't call back into JS code, so we can only ever have one
> such call on the stack at a time, allowing us to store the FP on the
> isolate rather than the stack.
> 
> TBR=v8-mips-ports@googlegroups.com
> 
> Bug: v8:8464, v8:7202
> Change-Id: I7bf39eba779dad34754d5759d741c421b362a406
> Reviewed-on: https://chromium-review.googlesource.com/c/1340241
> Commit-Queue: Peter Marshall <petermarshall@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Martyn Capewell <martyn.capewell@arm.com>
> Reviewed-by: Alexei Filippov <alph@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57896}

TBR=alph@chromium.org,jgruber@chromium.org,petermarshall@chromium.org,martyn.capewell@arm.com,v8-arm-ports@googlegroups.com,v8-mips-ports@googlegroups.com,ibogosavljevic@wavecomp.com

Change-Id: I85f846e57b6fa845e7770c616435cebffdb2a245
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8464, v8:7202
Reviewed-on: https://chromium-review.googlesource.com/c/1352302
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57899}
2018-11-28 11:04:36 +00:00
benchmarks Reland: [builtins] Implement Array.prototype.slice in Torque 2018-10-19 21:27:19 +00:00
build_overrides [ndk] Change android ndk root for v8 2018-01-11 08:10:33 +00:00
custom_deps [build] Add common directory for custom deps 2018-06-08 19:23:02 +00:00
docs
gni [build] disable asan on Windows for Torque 2018-10-10 11:47:40 +00:00
include [cleanup] Move FunctionTemplate::GetFunction to V8_DEPRECATED 2018-11-28 09:32:53 +00:00
infra [test] Bump shards on slow bot 2018-11-27 09:06:28 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src Revert "[cpu-profiler] Fix stack iterability for fast C calls with no exit frame" 2018-11-28 11:04:36 +00:00
test Revert "[cpu-profiler] Fix stack iterability for fast C calls with no exit frame" 2018-11-28 11:04:36 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [torque] Simplify and cleanup Cast and UnsafeCast 2018-11-27 06:50:30 +00:00
tools [tools] Improve locs.py 2018-11-27 13:42:54 +00:00
.clang-format
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +00:00
.editorconfig
.git-blame-ignore-revs
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore Ignore .torquelint-cache 2018-10-24 10:24:11 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Correctly identify and report test crashes and infra failures 2018-10-30 15:05:40 +00:00
.ycm_extra_conf.py
AUTHORS [typedarray] Use fast path for Float32Array.from(float_64_array) and similar 2018-10-26 09:47:46 +00:00
BUILD.gn Reland "Implement Faster MicrotaskQueue Step 2" 2018-11-27 11:27:46 +00:00
ChangeLog [tools] Merge ChangeLog from latest release 2017-12-19 12:30:56 +00:00
CODE_OF_CONDUCT.md
codereview.settings
DEPS Update V8 DEPS. 2018-11-28 07:23:25 +00:00
LICENSE Add antlr4 runtime library to support Torque 2018-04-10 10:01:01 +00:00
LICENSE.fdlibm
LICENSE.strongtalk
LICENSE.v8
LICENSE.valgrind
OWNERS Reduce wasm OWNERS to current team members 2018-10-15 14:47:49 +00:00
PRESUBMIT.py [tools] Correctly identify and report test crashes and infra failures 2018-10-30 15:05:40 +00:00
README.md
snapshot_toolchain.gni Reland "Add Windows ARM64 ABI support to V8" 2018-10-24 19:46:36 +00:00
WATCHLISTS Update WATCHLIST wrt yangguo 2018-11-23 08:29:12 +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.