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Clemens Backes 0de9a7e606 [wasm][debug] Leave stepping code early 
Stepping code that is left on the stack will repeatedly call the
WasmDebugBreak function. This has no observable effect, except for
severe slowdown of execution. In the linked bug, we were executing at
least another few million instructions in the same frame, so it appeared
that it never finishes.

This CL fixes that by replacing stepping code with non-stepping code if
the WasmDebugBreak runtime function is called from stepping code but we
are not stepping (any more).
Adding a test for this is difficult, since this only has an effect on
performance.

R=thibaudm@chromium.org

Bug: chromium:1153308
Change-Id: I02feb04a156dfe81ca76ce26f0af131c470ef7a3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2775575
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73567}
2021-03-22 14:04:13 +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 [build] Support Linux-arm64 builds hosts 2021-03-10 17:06:06 +00:00
include cppgc: Refactor object allocation to improve binary size 2021-03-17 22:01:23 +00:00
infra Revert "[test] Extend testing on Mac on arm64" 2021-03-18 16:33:09 +00:00
samples cppgc: Avoid initializing cppgc platform through V8 2021-02-09 08:26:11 +00:00
src [wasm][debug] Leave stepping code early 2021-03-22 14:04:13 +00:00
test [wasm][interpreter] Fix stack underflow behavior 2021-03-22 14:03:10 +00:00
testing build: Remove no-op calls to set_sources_assignment_filter 2020-10-08 14:44:01 +00:00
third_party [csa][cleanup] Simplify StoreFixedArrayElement 2021-02-19 14:01:50 +00:00
tools [wasm] Test --no-wasm-generic-wrapper in the stress variant 2021-03-22 09:45:59 +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 [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 Fix ycm config for headers without source 2019-12-09 11:59:21 +00:00
AUTHORS [aarm64] Fix GetSharedLibraryAddresses 2021-02-22 09:10:20 +00:00
BUILD.gn Revert "[bigint] Begin src/bigint refactoring" 2021-03-18 15:39:06 +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 Update COMMON_OWNERS. 2021-02-25 14:17:01 +00:00
DEPS Update V8 DEPS. 2021-03-22 03:49:28 +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
LICENSE.v8
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 cppgc: Add testing API structure 2021-02-03 16:00:37 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
RISCV_OWNERS Add RISC-V backend 2021-02-09 17:06:36 +00:00
S390_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
WATCHLISTS Add a watchlist for ieee754.(cc|h) changes. 2021-01-11 18:10:19 +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.