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Peter Marshall ca6675ed95 [cpu-profiler] Add stats to track missing or unnattributed frames 
This adds a global counter for the various reasons we might fail to
attribute a tick.

The counters are cleared and printed when Profile::Print() is called,
which we call in our tests, so flaky test output will now contain these
stats along with the printed profile tree.

Drive-by cleanup some print functions and make them const.

Change-Id: Ia3a27405f5b5346adfdbb32afc7e414857969cc5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1550406
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69647}
2020-09-01 15:14:49 +00:00
build_overrides tracing: Enable using Perfetto client library from Chromium 2020-05-11 11:17:57 +00:00
custom_deps Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
docs Add OWNERS for docs/ 2019-05-15 12:06:15 +00:00
gni [heap] Add object start bitmap for conservative stack scanning 2020-08-31 07:10:36 +00:00
include [API] Add missing include for <atomic> 2020-09-01 07:46:09 +00:00
infra [nci] Change testing mode to --turbo-nci-as-midtier 2020-08-20 12:54:40 +00:00
samples cppgc: Add DefaultPlatform and standalone sample 2020-07-23 09:54:32 +00:00
src [cpu-profiler] Add stats to track missing or unnattributed frames 2020-09-01 15:14:49 +00:00
test [cpu-profiler] Add stats to track missing or unnattributed frames 2020-09-01 15:14:49 +00:00
testing Roll v8/third_party/googletest/src/ 10b1902d8..e3f0319d8 (43 commits) 2020-04-15 07:23:10 +00:00
third_party [csa][cleanup] Remove ParameterMode/TNodify StoreFixedDoubleArrayElement 2020-08-26 17:14:44 +00:00
tools Revert "[cpu-profiler] Ensure sampled thread has Isolate lock under Windows" 2020-09-01 10:21:41 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +00:00
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.flake8 Add .flake8 to allow for python style checking. 2019-07-19 21:44:03 +00:00
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.gitignore Revert "[presubmit] Add JS formatting for tools/system-analyzer" 2020-07-17 10:33:40 +00:00
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.vpython [tools] Implement confidence-based number of runs 2019-05-09 09:42:28 +00:00
.ycm_extra_conf.py Fix ycm config for headers without source 2019-12-09 11:59:21 +00:00
AUTHORS Use NtCurrentTeb() in GetStackStart() to fix 64-bit Wine on macOS 2020-08-31 18:22:05 +00:00
BUILD.gn [cpu-profiler] Add stats to track missing or unnattributed frames 2020-09-01 15:14:49 +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 Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
COMMON_OWNERS Adding vahl@ to the common owners to be able to handle 2020-08-21 09:04:56 +00:00
DEPS [DEPS] Add third_party/requests to deps 2020-09-01 11:35:19 +00:00
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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://v8.dev/docs

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 at v8.dev/docs/contribute.