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Jakob Gruber 99d31b432f [build] Define V8_TARGET_OS_ and consider it in x64 codegen 
This CL allows us to distinguish between the host- and target OS. The
host OS is defined by V8_OS_ macros (e.g. V8_OS_WIN). The target OS is
defined by V8_TARGET_OS_ macros (e.g. V8_TARGET_OS_WIN).

V8_TARGET_OS_ macros are defined by gn, based on the `target_os` gn
variable. If a V8_TARGET_OS_ is set, we also define V8_HAVE_TARGET_OS
(this determines fall-back behavior in V8; if it is not defined, we set
V8_TARGET_OS_ to equal the equivalent V8_OS_ define).

Besides adding the defines, this CL also adds logic to consider the
target OS in codegen. Specifically, x64 builds now look at the
V8_TARGET_OS_WIN define instead of V8_OS_WIN or _WIN64. This
effectively makes cross-compilation to x64 Windows in mksnapshot
possible.

In future work, we could add similar support for cross-compiling to
other platforms such as ia32 Windows.

Bug: v8:9736,chromium:803591
Change-Id: I689f3de8c206b743c4bef703f5ade0bba32ce995
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809374
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63892}
2019-09-19 13:38:56 +00:00
benchmarks Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
build_overrides Use relative paths to OWNERS files 2019-08-12 13:52:52 +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 Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
include [build] Define V8_TARGET_OS_ and consider it in x64 codegen 2019-09-19 13:38:56 +00:00
infra msan: Stop explicitly setting use_prebuilt_instrumented_libraries. 2019-09-19 12:37:55 +00:00
samples [cleanup] Drop some occurrences of Isolate::Current 2019-06-26 19:39:21 +00:00
src [build] Define V8_TARGET_OS_ and consider it in x64 codegen 2019-09-19 13:38:56 +00:00
test [CSA] Ensure we only call ToName once in KeyedLoadICGeneric. 2019-09-19 12:39:46 +00:00
testing Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
third_party Remove unnecessary HasOwnProperty check from Array#sort 2019-09-18 12:39:43 +00:00
tools [snapshot] Allow an empty v8_extra_library_files 2019-09-18 12:49:19 +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 Add recent code rewrite to .git-blame-ignore-revs 2019-05-23 10:38:45 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore Remove MIPS(64) builders from V8 infra 2019-09-16 11:20:11 +00:00
.gn [build] Dynamically decide if to use system xcode 2019-07-29 08:20:24 +00:00
.vpython [tools] Implement confidence-based number of runs 2019-05-09 09:42:28 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS [wasm][anyref] fix decoding of table index immediates 2019-08-20 14:54:59 +00:00
BUILD.gn [build] Define V8_TARGET_OS_ and consider it in x64 codegen 2019-09-19 13:38:56 +00:00
ChangeLog [release] Merge ChangeLog back to master 2018-12-07 15:41:59 +00:00
CODE_OF_CONDUCT.md
codereview.settings Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
COMMON_OWNERS [OWNERS] Add solanes@ to COMMON_OWNERS 2019-05-22 13:50:51 +00:00
DEPS Update V8 DEPS. 2019-09-19 03:46:18 +00:00
ENG_REVIEW_OWNERS Add eng review owners as escalation path 2019-05-15 19:12:10 +00:00
INFRA_OWNERS Clean up infra owners 2019-05-15 11:18:43 +00:00
INTL_OWNERS Add missing owners files 2019-05-31 07:21:01 +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
LICENSE.v8
LICENSE.valgrind
MIPS_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
OWNERS Add syg@chromium.org as DEPS owner for test262 rolls 2019-09-17 19:29:11 +00:00
PPC_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
PRESUBMIT.py [test] Refactoring presubmit for readability 2019-09-16 06:22:44 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
S390_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
WATCHLISTS Move remaining files in src/ 2019-05-24 18:24:36 +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.