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Meta: Add a ladybird.py command to profile a process

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Works basically the same as the debug command. This command uses
callgrind for now, which matches LibWebView/HelperProcess.cpp.
This commit is contained in:
Timothy Flynn 2025-08-06 20:10:14 -04:00 committed by Tim Flynn
parent 11f4b9c6ae
commit f3c3213b06
1 changed files with 28 additions and 0 deletions
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28
Meta/ladybird.py
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@ -84,6 +84,15 @@ def main():
"args", nargs=argparse.REMAINDER, help="Additional arguments passed through to the build system"
)
profile_parser = subparsers.add_parser(
"profile",
help="Launches the application under callgrind for performance profiling",
parents=[preset_parser, compiler_parser, target_parser],
)
profile_parser.add_argument(
"args", nargs=argparse.REMAINDER, help="Additional arguments passed through to the build system"
)
install_parser = subparsers.add_parser(
"install", help="Installs the target binary", parents=[preset_parser, compiler_parser, target_parser]
)
@ -157,6 +166,10 @@ def main():
build_dir = configure_main(platform, args.preset, args.cc, args.cxx)
build_main(build_dir, args.jobs, args.target, args.args)
debug_main(platform.host_system, build_dir, args.target, args.debugger, args.cmd)
elif args.command == "profile":
build_dir = configure_main(platform, args.preset, args.cc, args.cxx)
build_main(build_dir, args.jobs, args.target, args.args)
profile_main(platform.host_system, build_dir, args.target)
elif args.command == "install":
build_dir = configure_main(platform, args.preset, args.cc, args.cxx)
build_main(build_dir, args.jobs, args.target, args.args)
@ -387,6 +400,21 @@ def debug_main(host_system: HostSystem, build_dir: Path, target: str, debugger:
run_command(gdb_args, exit_on_failure=True)
def profile_main(host_system: HostSystem, build_dir: Path, target: str):
if not shutil.which("valgrind"):
print("Please install valgrind", file=sys.stderr)
sys.exit(1)
valgrind_args = ["valgrind", "--tool=callgrind", "--instr-atstart=yes"]
if target == "Ladybird" and host_system == HostSystem.macOS:
valgrind_args.append(str(build_dir.joinpath("bin", "Ladybird.app")))
else:
valgrind_args.append(str(build_dir.joinpath("bin", target)))
run_command(valgrind_args, exit_on_failure=True)
def clean_main(preset: str):
ladybird_source_dir, build_preset_dir = configure_build_env(preset)
shutil.rmtree(str(build_preset_dir), ignore_errors=True)