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Michael Achenbach f98f496f9e Revert "[wasm] Add PKU alloc/free and support counter" 
This reverts commit a4c37558d1.

Reason for revert: Speculative revert.
Seems to break all gpu builders, e.g.:
https://ci.chromium.org/p/v8/builders/ci/Linux%20V8%20FYI%20Release%20(NVIDIA)/14577

See shards for detailed output, e.g.:
https://chromium-swarm.appspot.com/task?id=534a8fbeaca4df10

Check failed: valid_arguments. V8.WasmMemoryProtectionKeysSupport

Original change's description:
> [wasm] Add PKU alloc/free and support counter
>
> To enforce W^X for the WebAssembly code space, we want to explore using
> Intel memory protection keys for userspace, also known as MPK, PKEYs, or
> PKU. Instead of flipping page protection flags with mprotect (which
> incurs a high syscall overhead; and which switches flags for the whole
> process), this associates a key with each page once, and then changes
> the permissions of that key with a fast thread-local register write.
> That is, this gives both finger-grained permissions (per-thread) and
> more performance.
>
> This CL is starts experimenting with PKUs by
> (1) trying to allocate a protection key once per {WasmEngine} in x64
> Linux systems, and
> (2) adding a counter for recording the sucess/failure of that, to assess
> the support for PKUs on the target machine.
>
> The low-level PKU allocating functions should be moved into base/platform
> long-term, but are inside wasm/ for this CL.
>
> R=​clemensb@chromium.org
> CC=​​jkummerow@chromium.org
>
> Bug: v8:11714
> Change-Id: Ia4858970ced4d0b84cc8c2651e86dceb532c88a7
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2850932
> Commit-Queue: Daniel Lehmann <dlehmann@google.com>
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#74319}

Bug: v8:11714
Change-Id: I70349d413ac9092e2f033d138887678bfecaae17
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2868607
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#74339}
2021-05-03 19:15:13 +00:00
.github [github] Close PRs created on the V8 GitHub mirror automatically 2021-01-12 08:39:59 +00:00
build_overrides [build] Remove obsolete gn flag 2021-01-11 15:50:59 +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 Make Google benchmark dependency a default 2021-04-21 12:19:40 +00:00
include [cleanup][include] Remove redundant NOLINT annotations 2021-04-30 16:22:19 +00:00
infra [infra] split heap sandbox builders to builder tester pairs 2021-05-03 13:34:26 +00:00
samples Reland "[api] Add v8::Isolate::ThrowError helper" 2021-04-16 11:48:05 +00:00
src Revert "[wasm] Add PKU alloc/free and support counter" 2021-05-03 19:15:13 +00:00
test Reland "cppgc: Try to fix test IteratePointersFindsCalleeSavedRegisters, vol.2" 2021-05-03 18:14:22 +00:00
testing build: Remove no-op calls to set_sources_assignment_filter 2020-10-08 14:44:01 +00:00
third_party Reland "[build] Fix gn check failures in v8/third_party" 2021-04-30 16:26:19 +00:00
tools [tools][system-analyzer] Postpone updating collapsed panels 2021-05-03 14:14:46 +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
.editorconfig Add .editorconfig 2017-07-28 13:39:24 +00:00
.flake8 Add .flake8 to allow for python style checking. 2019-07-19 21:44:03 +00:00
.git-blame-ignore-revs [infra] Update .git-blame-ignore-revs 2020-03-03 12:59:13 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore [build] Remove legacy binutils 2021-01-08 12:33:31 +00:00
.gn Reland "[build] Fix gn check failures in v8/third_party" 2021-04-30 16:26:19 +00:00
.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 [tools] Make tools/mb/mb.py work with Python 3 2021-04-27 09:08:43 +00:00
BUILD.gn Revert "[wasm] Add PKU alloc/free and support counter" 2021-05-03 19:15:13 +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 Remove petermarshall from OWNERS 2021-03-31 11:00:22 +00:00
DEPS Update V8 DEPS. 2021-05-03 06:44:08 +00:00
DIR_METADATA Add DIR_METADATA files to v8. 2020-10-20 22:12:28 +00:00
ENG_REVIEW_OWNERS Update ENG_REVIEW_OWNERS 2021-02-25 14:28:32 +00:00
INFRA_OWNERS Add team members as owners 2020-08-18 08:29:04 +00:00
INTL_OWNERS add ftang as owner 2020-04-24 19:19:36 +00:00
LICENSE [wasm] Draft version of C/C++ Wasm API 2019-04-17 16:00:26 +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
MIPS_OWNERS [mips] Request to be an owner of MIPS files 2020-11-23 09:43:49 +00:00
OWNERS Add RISC-V backend 2021-02-09 17:06:36 +00:00
PPC_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
PRESUBMIT.py [bigint] Move multiplication to src/bigint/ 2021-04-19 15:40:43 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
RISCV_OWNERS [riscv64] Change one of the owners for RISCV. 2021-04-20 14:39:26 +00:00
S390_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
WATCHLISTS [watchlist] Add leszeks to src/baseline watchlist 2021-04-27 08:40:24 +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://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.