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Jakob Linke 833647b476 [maglev] Extract the function prologue to an out of line builtin 
Prior to this CL the function prologue took roughly the first 340
bytes of any generated ML code object (release mode, x64). The
prologue handles deoptimization, optimization, stack (and interrupt)
checks, and stack frame setup including reserving and initializing
space for stack locals.

All this is now extracted to the MaglevOutOfLinePrologue builtin.

Costs:
- The extra unconditional builtin call at the start of ML code.
- Only dynamic knowledge of # stack slots (so we can't unroll
  initialization loops as well as with static knowledge).
- Some extra complexity due to frame and return address juggling.

Benefits:
- 340 bytes saved per code object (memory).
- 340 bytes saved per code object (codegen time).
- The prologue contains 5 reloc entries, with an ool prologue we
  don't have to iterate these at runtime.

The ool prologue can be enabled/disabled with --maglev-ool-prologue
(on by default).

One option for the future is to move stack slot initialization
back inline since it doesn't emit much code and benefits from static
knowledge of stack layout.

Bug: v8:7700
Change-Id: I182a9591e62d205de0223036ba8cb25e9c6a6347
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3934842
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83533}
2022-10-05 09:58:06 +00:00
.github [github] Close PRs created on the V8 GitHub mirror automatically 2021-01-12 08:39:59 +00:00
bazel [bazel] Add hide symbols from release / fast builds 2022-10-04 11:11:01 +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 [mips32] Delete mips32 from v8 2022-09-13 07:54:54 +00:00
include [api] Expose parsed module source map urls 2022-10-05 08:13:48 +00:00
infra Revert "[heap] Remove MinorMC variant from bots" 2022-09-14 13:23:28 +00:00
samples [sandbox] Initialize sandbox during V8::Initialize 2022-07-15 09:29:32 +00:00
src [maglev] Extract the function prologue to an out of line builtin 2022-10-05 09:58:06 +00:00
test [heap] Don't preallocate pages in PagedNewSpace 2022-10-05 09:52:56 +00:00
testing [test] Migrate cctest/test-api-accessors.cc to unittests/ 2022-05-17 08:27:55 +00:00
third_party Roll inspector_protocol 6901e556365f74a41bb85b62a70d444d87db639a 2022-09-20 13:15:42 +00:00
tools Reland "[intl] Implement DurationFormat" 2022-10-05 07:42:28 +00:00
.bazelrc [bazel] Use v8_enable_handle_zapping only in debug builds. 2022-01-11 11:32:39 +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 remove swarming_client 2021-08-24 10:39:33 +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 [cleanup] Add .idea to .gitignore 2022-08-22 19:54:38 +00:00
.gn [fuchsia] Add API target level default value 2022-08-29 14:46:45 +00:00
.mailmap Add .mailmap entries for jgruber 2022-08-04 08:53:02 +00:00
.style.yapf [tools] Add basic pointer compression to grokdump 2022-02-04 14:35:26 +00:00
.vpython3 Reland "[Python3] Clean up python2 holdovers" 2022-09-23 16:06:32 +00:00
.ycm_extra_conf.py [ycm] Fix python script 2021-07-29 09:48:32 +00:00
AUTHORS [handles] Add direct handles 2022-09-26 15:39:58 +00:00
BUILD.bazel Reland "[intl] Implement DurationFormat" 2022-10-05 07:42:28 +00:00
BUILD.gn Reland "[intl] Implement DurationFormat" 2022-10-05 07:42:28 +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 [owners] Add mliedtke to COMMON_OWNERS 2022-09-16 14:12:27 +00:00
DEPS Install CIPD ninja using DEPS 2022-10-05 07:45:28 +00:00
DIR_METADATA Add DIR_METADATA files to v8. 2020-10-20 22:12:28 +00:00
ENG_REVIEW_OWNERS Adding vahl@ as owner to speed up merge handling 2022-07-01 08:06:14 +00:00
INFRA_OWNERS [infra] Add alexschulze@ as infra owner 2022-07-18 09:08:54 +00:00
INTL_OWNERS add ftang as owner 2020-04-24 19:19:36 +00:00
LICENSE [mips32] Delete mips32 from v8 2022-09-13 07:54:54 +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
LOONG_OWNERS [LOONG64] Add LoongArch64 backend 2021-08-16 13:05:19 +00:00
MIPS_OWNERS [mips] Add LiuYu to MIPS_OWNERS 2021-09-08 01:38:52 +00:00
OWNERS Reland "[riscv32] Add RISCV32 backend" 2022-08-04 12:47:44 +00:00
PPC_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
PRESUBMIT.py [wasm] Limit module size in streaming decoder 2022-07-08 09:43:41 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
RISCV_OWNERS Add Lu Yahan to RISC-V owners list 2021-09-13 16:35:00 +00:00
S390_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
WATCHLISTS Reland "[WATCHLISTS] Add riscv watch" 2022-08-19 07:33:57 +00:00
WORKSPACE [bazel] Remove zlib dependency 2022-08-17 15:30:25 +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.