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Leszek Swirski 094359d085 [gcmole] Track table handles, slots, and members across GCs

Extend GCMole to check that table handles (ExternalPointerHandle,
CppHeapPointerHandle, IndirectPointerHandle, and JSDispatchHandle),
along with their slots (ExternalPointerSlot, CppHeapPointerSlot,
IndirectPointerSlot) and on-heap layout members (ExternalPointerMember,
TrustedPointerMember, CppHeapPointerMember, JSDispatchHandleMember), do
not become stale across GCs.

Table handles are tracked by value via IsTableHandleType, while interior
pointers to on-heap handle fields are covered by *Member* and *Slot
(removing JSDispatchHandle* tracking). Also handle builtin assignment
(BO_Assign) for scalar handle typedefs and ignore constexpr or non-local
variables in FunctionAnalyzer::Use so global constants like
kNullExternalPointerHandle do not trigger false positives.

TAG=agy
CONV=b28ddaf1-e172-44f5-8ec2-f06f4134b6e9

Bug: 571814087
Change-Id: Iae3d83182a058e5d92918524c46273a89ab93f85
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8545995
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#110540}

2026-10-09 13:08:05 -07:00

bazel

[bazel] Update prebuilt bazel to 9.1.0

2026-04-30 04:55:48 -07:00

bigsleep

[bigsleep] Update V8 snapshot creation script

2026-08-12 04:39:55 -07:00

builtins-pgo

[jetstream3] Fix benchmark skip parameter

2026-08-04 06:43:59 -07:00

cfi

[build] Fix order of CFI suppressions

2026-08-21 02:23:41 -07:00

clusterfuzz

[foozzie] Suppress cross-arch precision differences

2026-10-08 00:56:52 -07:00

cppgc

[cppgc] Rename src/heap/cppgc/ to src/heap/cppgc-internal/

2026-06-22 02:41:04 -07:00

debug_helper

[metagen] Consolidate build flags

2026-10-06 03:03:17 -07:00

dev

[tools] Use a single global lock for .deps_cache operations

2026-10-06 06:02:48 -07:00

explicit-compile-hints

[compile hints] Update to the latest spec

2025-02-26 03:09:39 -08:00

gcmole

[gcmole] Track table handles, slots, and members across GCs

2026-10-09 13:08:05 -07:00

generate_shim_headers

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

heap-layout

[tools] Better heap-layout instructions

2025-12-17 09:40:46 -08:00

heap-stats

[heap] Remove StrongDescriptorArray

2026-07-07 22:10:11 -07:00

[tools] Add temporary jj configuration

2026-09-28 08:56:52 -07:00

[tools] Better heap-layout instructions

2025-12-17 09:40:46 -08:00

jsfunfuzz

[test] update the jsfunfuzz archive in Google Storage

2018-12-18 15:00:35 +00:00

link_clicker.extension

[tools] Add link_click chrome extension

2017-05-09 15:25:21 +00:00

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

memory

Update V8 DEPS (trusted)

2024-06-28 11:34:31 +00:00

metagen

[metagen] Define bitfields in C++ instead of .tq

2026-10-09 06:23:18 -07:00

msan

Rename msan blacklist.txt to ignorelist.txt

2021-05-27 08:24:50 +00:00

perf

[tools] Refactor patch/no-patch terminology in run_perf.py

2017-11-22 07:19:50 +00:00

profiling

[profiling] Fix custom perf option

2026-07-01 09:52:35 -07:00

profview

[tools] Fix timestamp correction

2024-04-23 13:05:59 +00:00

regexp/correctness_fuzzer

[regexp] Fix pattern literals in correctness fuzzer reports

2026-10-09 02:05:10 -07:00

release

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

sanitizers

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

snapshot

Add target and builders for verifying deterministic mksnapshot output

2023-03-17 10:30:29 +00:00

system-analyzer

[system-analyzer] Add profile subcommand to logviewer CLI

2026-05-05 02:22:52 -07:00

testrunner

[test] Speed up test runner by spawning tests via vfork (~10% CPU)

2026-10-09 02:42:02 -07:00

toolchain

[mips32] Delete mips32 from v8

2022-09-13 07:54:54 +00:00

torque

[objects] Port Microtask and Promise classes to StructLayout

2025-11-26 07:36:25 -08:00

turbolizer

[tools] Bump morgan to 1.11.0 to address CVE-2026-5078

2026-08-11 10:09:01 -07:00

ubsan

Revert "Add ignorelist for -fsanitize=array-bounds"

2025-10-07 00:12:23 -07:00

unittests

[tools] Better run_perf.py variants testing with test_flags

2026-04-15 09:39:09 -07:00

v8windbg

[v8windbg] Test script name and source properties

2025-12-30 10:04:56 -08:00

valgrind/asan

[build] Add testrunner data deps

2018-03-26 12:17:08 +00:00

vim

remove references to goma

2024-05-15 15:17:32 +00:00

visual_studio

…

wasm

[build] Avoid propagating run_torque and v8_tracing via public headers

2026-09-28 04:47:28 -07:00

zone-stats

Remove some unused and outdated TF artifacts

2025-06-27 02:32:50 -07:00

__init__.py

[tools] Fix ll_prof.py

2024-11-15 10:05:11 +00:00

adb-d8.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

android-build.sh

Rewrite Makefile rules for Android to allow parallel execution

2012-07-27 11:14:44 +00:00

android-run.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

arguments.mjs

[tools] Support bigint addresses in the tickprocessor

2023-10-25 16:19:06 +00:00

avg.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

bash-completion.sh

[tools] Fix bash completion after feature flags refactoring

2026-08-26 05:27:13 -07:00

bigint-tester.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

BUILD.gn

[vpython] Migrate legacy .vpython3 to modern vpython.toml (UV)

2026-09-16 07:03:50 -07:00

callstats_groups.py

[tools] Add separate RCS categories for maglev

2025-04-09 08:54:05 -07:00

callstats-from-telemetry.sh

[tools] Improve RCS conversion tool

2023-04-27 07:41:35 +00:00

callstats.html

[tools] Improve callstats.html help text

2025-05-06 01:08:51 -07:00

callstats.py

[tools] Add separate RCS categories for maglev

2025-04-09 08:54:05 -07:00

check_bazel_deps.py

Add check_bazel_deps.py tool to monitor and update Bzlmod dependencies

2026-06-09 08:23:27 -07:00

check-inline-includes.sh

[iwyu] Extend inline include checking to tests.

2017-09-08 09:31:32 +00:00

check-static-initializers.sh

Bump expected static initializers count from 2 to 3

2021-02-12 09:47:44 +00:00

check-unused-bailouts.sh

[tools] Speed-up check-unused-bailouts.sh

2017-08-02 11:11:19 +00:00

check-unused-symbols.sh

[cleanup] Remove unused heap-symbols and add tool.

2018-11-08 17:57:05 +00:00

cluster_files.py

[build] Make v8_enable_cluster_build (exclude files remix)

2026-03-06 01:57:48 -08:00

codemap.mjs

[tools] Support bigint addresses in the tickprocessor

2023-10-25 16:19:06 +00:00

collect_deprecation_stats.sh

[objects] Deprecate GetIsolate/Heap behind a flag

2018-06-01 15:19:21 +00:00

compare_torque_output.py

[v8] Migrate compare_torque_output to py3

2022-02-08 15:46:11 +00:00

compare-table-gen.js

Add more exhaustive tests for Math.min and Math.max.

2015-04-10 12:35:16 +00:00

consarray.mjs

[tools] Migrate more tools to ES6 classes

2021-01-11 16:40:39 +00:00

cpu.sh

[tools] Improve cpu.sh -h

2026-03-31 03:27:09 -07:00

cross_build_gcc.sh

Fix tools/cross_build_gcc.sh.

2014-02-20 16:37:40 +00:00

csvparser.mjs

[tools][system-analyzer] Various improvements

2022-04-08 19:46:22 +00:00

DEPS

Add DEPS files and run checkdeps in presubmit check

2014-06-03 13:39:42 +00:00

detect-builtins.js

[tools] Fix detect-builtins.js

2016-06-09 10:17:32 +00:00

disasm.py

[mips32] Delete mips32 from v8

2022-09-13 07:54:54 +00:00

draw_instruction_graph.sh

Rename A64 port to ARM64 port

2014-03-21 09:28:26 +00:00

dump-cpp.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

dumpcpp-driver.mjs

[tools][system-analyzer] Add local symbol server

2021-07-01 09:59:17 +00:00

dumpcpp.mjs

[tools][system-analyzer] Speed up log parsing

2022-04-06 11:31:03 +00:00

eval_gc_nvp.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

eval_gc_time.sh

Remove all leftovers of store buffer

2021-11-10 09:29:41 +00:00

find_depot_tools.py

Preparing v8 to use with python3 /tools

2019-02-19 09:12:07 +00:00

find-builtin

[tools] Add a tool for finding builtins

2021-04-07 12:51:38 +00:00

find-commit-for-patch.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

find-d8.sh

[agents] Add tools/v8-logviewer

2026-04-27 07:08:59 -07:00

fix-inl-header-includes.sh

[cleanup] Fix inl header includes

2025-03-25 10:21:48 -07:00

freebsd-tick-processor

…

fuzz-harness.sh

[compiler] Make --debug-code the default in debug builds.

2016-12-02 11:36:55 +00:00

gc_nvp_common.py

[tools] Fix Python scripts for processing --trace-gc-nvp

2023-07-26 10:34:30 +00:00

gc-nvp-to-csv.py

[tools] Fix Python scripts for processing --trace-gc-nvp

2023-07-26 10:34:30 +00:00

gc-nvp-trace-processor.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

gdb-v8-support.py

Multiple Python small fixes

2023-08-18 19:13:45 +00:00

gdbinit

[tools] make the gdb unwinder handle symbolized embedded builtins

2026-07-03 06:55:21 -07:00

gen-inlining-tests.py

[flag] Remove remaining mentions of --always-turbofan

2025-07-28 05:50:27 -07:00

gen-keywords-gen-h.py

[tools] Fix gen-keyword-gen-h.py and improve error message

2024-04-23 16:11:30 +00:00

gen-postmortem-metadata.py

[torque][metagen] Make C++ the source of truth for instance types

2026-08-31 02:55:09 -07:00

gen-v8-gn.py

infra: gen-v8-gn.py should work with ABC=<int> defines

2025-03-17 03:38:26 -07:00

generate-builtins-tests.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

generate-header-include-checks.py

[wasm] Wasm interpreter new features and bug fixes

2024-12-13 06:51:31 -08:00

generate-runtime-call-stats.py

[tools] Fix retention of json files in RCS script

2020-03-26 12:07:56 +00:00

generate-ten-powers.scm

…

get_landmines.py

[py3] Bump get_landmines to py3

2022-04-04 11:03:36 +00:00

grokdump.py

[tools] Make grokdump robust against non-readable fields

2025-05-26 08:51:58 -07:00

heap-snapshot-processor.py

[tools] Add a script which can process the heap snapshot format

2023-06-21 13:12:02 +00:00

ic-processor

[agents] Add tools/v8-logviewer

2026-04-27 07:08:59 -07:00

ic-processor-driver.mjs

[tools] Do some formatting to trigger secret CQ checks

2023-09-01 18:44:20 +00:00

include-file-as-bytes.py

[temporal] zoneinfo64 support for Temporal

2025-09-11 12:40:14 -07:00

index.html

[tools] Fix index.html links

2022-08-29 14:14:56 +00:00

linux-tick-processor

[agents] Add tools/v8-logviewer

2026-04-27 07:08:59 -07:00

lldb_commands.py

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

lldb_visualizers.py

Rename JS-specific frame types and markers

2024-10-14 11:37:53 +00:00

locs.py

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

logreader.mjs

[tools] improve v8-logviewer commands and add map and deopt stats

2026-04-28 06:27:35 -07:00

mac-nm

[tools] Suppress missing framework errors in mac-nm

2026-03-16 06:46:41 -07:00

mac-tick-processor

…

Makefile.tags

[Makefile] Move tags generation to standalone Makefile

2018-01-26 12:03:32 +00:00

objdump-v8

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

OWNERS

[owners] Includes infra team as tools owners

2021-11-25 07:55:08 +00:00

package-lock.json

[tools] Bump morgan to 1.11.0 to address CVE-2026-5078

2026-08-11 10:09:01 -07:00

package.json

Use locally installed local-web-server

2024-09-17 19:14:28 +00:00

parse-processor

[agents] Add tools/v8-logviewer

2026-04-27 07:08:59 -07:00

parse-processor-driver.mjs

[tools][system-analyzer] Add local symbol server

2021-07-01 09:59:17 +00:00

parse-processor.html

Fix spelling errors and other pedantry.

2024-08-20 15:01:52 +00:00

parse-processor.mjs

[tools] Fix parse-processor

2022-08-04 19:00:33 +00:00

perf-bisect.pl

[tools] Fixes for perf-bisect.pl

2026-01-19 01:35:04 -08:00

perf-compare.py

Multiple Python small fixes

2023-08-18 19:13:45 +00:00

predictable_wrapper.py

[test] Rerun tests more often in verify-predictable mode

2024-10-21 14:16:23 +00:00

PRESUBMIT.py

[builtins][pgo] Add helper script to interact with PGO profile bucket

2023-01-12 14:16:16 +00:00

process-wasm-compilation-times.py

[wasm] --trace-wasm-compilation-times: use microseconds

2025-12-01 04:31:18 -08:00

profile_view.js

Tick processor: improved [Summary] section

2014-08-04 08:31:49 +00:00

profile_view.mjs

[tools] Modernize tools .mjs files

2020-11-10 12:32:26 +00:00

profile.mjs

[agents] Add tools/v8-logviewer

2026-04-27 07:08:59 -07:00

README.md

Use locally installed local-web-server

2024-09-17 19:14:28 +00:00

regexp-sequences.py

[regexp] Update regexp-sequences.py

2026-01-27 03:53:58 -08:00

run_perf.py

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

run-clang-tidy.py

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

run-num-fuzzer.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

run-tests.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

run-wasm-api-tests.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

run.py

[build] Enable logging mksnapshot output when verifying determinism

2024-08-29 17:31:15 +00:00

sourcemap.mjs

[tools][system-analyzer] Add profiler-panel

2022-04-26 17:57:03 +00:00

splaytree.mjs

[tools] Improve system analyzer

2022-03-02 13:41:32 +00:00

stats-viewer.py

[infra] Change all Python shebangs to Python3

2022-08-05 14:55:00 +00:00

test262-results-parser.js

test262 roll

2018-08-28 21:18:23 +00:00

tickprocessor-driver.mjs

[tools] Do some formatting to trigger secret CQ checks

2023-09-01 18:44:20 +00:00

tickprocessor.mjs

[logging] Append IDLE_EXTERNAL to StateTag to preserve log compatibility

2025-08-25 10:50:52 -07:00

try_perf.py

[perf] Update arm64 performance bots to pixel4

2023-06-12 11:56:37 +00:00

turbolizer-perf.py

Preparing v8 to use with python3 /tools

2019-02-19 09:12:07 +00:00

turboshaft_type_formatter.py

[turboshaft] Turboshaft stack trace filter util

2026-03-03 02:01:19 -08:00

turboshaft-stacktrace-filter.py

[turboshaft] Turboshaft stack trace filter util

2026-03-03 02:01:19 -08:00

update-object-macros-undef.py

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

v8_presubmit.py

[tools] Fix invalid escape sequence warnings in Python scripts

2026-09-14 03:21:32 -07:00

v8-logviewer

[tools] improve v8-logviewer commands and add map and deopt stats

2026-04-28 06:27:35 -07:00

vpython.toml

[vpython] Migrate legacy .vpython3 to modern vpython.toml (UV)

2026-09-16 07:03:50 -07:00

vpython.toml.uv.lock

[vpython] Migrate legacy .vpython3 to modern vpython.toml (UV)

2026-09-16 07:03:50 -07:00

whitespace.txt

Whitespace change to test bots

2026-07-22 08:08:46 -07:00

windbg.js

[isolate] Move HandleScopeImplementer to IsolateData

2026-06-03 08:29:15 -07:00

windows-tick-processor.bat

[tools] Use .mjs in windows-tick-processor.bat

2021-01-07 09:00:23 +00:00

wpr.wprp

Step 1 (of 3-ish): Basic ETW Instrumentation in V8

2021-01-05 20:11:03 +00:00

README.md

TOOLS

This directory contains debugging and investigation tools for V8.

The contents are regularly mirrored to http://v8.dev/tools.

Local Development

For local development you have to start a local webserver under http://localhost:8000:

  cd tools/;
  npm install;
  npm run start-webserver;

Local Symbol Server

The system-analyzer can symbolize profiles for local binaries by running a local symbol server

  cd tools/;
  ./system-analyzer/local-server.sh;

Note that the local symbol server will run nm and objdump and has access to your files.