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bh=mZWXq7GO5mx558feE0Kb1/8jgJE3wrTyvSY41kIzuWY=; b=Lkw5YVpfleKaQGP1FWIWle0zTMyxc+HWNaPKebszaF4Y1X+/IGWZcYg/IIqxXfGL/waW4p Mw1AswQrHNgvdNXPlzJlGZh8XAX9B6xMmoHQ07w2BVjj2Kv2GImSN8hujPTlhdkxJGfx2m PUsU5j2i7pVO2NLCzpU7zeS518SjOII= X-MC-Unique: R-AA6rvxNWKnodzD_SpNSg-1 From: John Snow To: Markus Armbruster , qemu-devel@nongnu.org Subject: [PATCH v2 01/38] [DO-NOT-MERGE] qapi: add debugging tools Date: Tue, 22 Sep 2020 17:00:24 -0400 Message-Id: <20200922210101.4081073-2-jsnow@redhat.com> In-Reply-To: <20200922210101.4081073-1-jsnow@redhat.com> References: <20200922210101.4081073-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jsnow@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" This adds some really childishly simple debugging tools. Maybe they're interesting for someone else, too? Signed-off-by: John Snow --- scripts/qapi/debug.py | 78 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 scripts/qapi/debug.py diff --git a/scripts/qapi/debug.py b/scripts/qapi/debug.py new file mode 100644 index 0000000000..bacf5ee180 --- /dev/null +++ b/scripts/qapi/debug.py @@ -0,0 +1,78 @@ +""" +Small debugging facilities for mypy static analysis work. +(C) 2020 John Snow, for Red Hat, Inc. +""" + +import inspect +import json +from typing import Dict, List, Any +from types import FrameType + + +OBSERVED_TYPES: Dict[str, List[str]] =3D {} + + +# You have no idea how long it took to find this return type... +def caller_frame() -> FrameType: + """ + Returns the stack frame of the caller's caller. + e.g. foo() -> caller() -> caller_frame() return's foo's stack frame. + """ + stack =3D inspect.stack() + caller =3D stack[2].frame + if caller is None: + msg =3D "Python interpreter does not support stack frame inspectio= n" + raise RuntimeError(msg) + return caller + + +def _add_type_record(name: str, typestr: str) -> None: + seen =3D OBSERVED_TYPES.setdefault(name, []) + if typestr not in seen: + seen.append(typestr) + + +def record_type(name: str, value: Any, dict_names: bool =3D False) -> None: + """ + Record the type of a variable. + + :param name: The name of the variable + :param value: The value of the variable + """ + _add_type_record(name, str(type(value))) + + try: + for key, subvalue in value.items(): + subname =3D f"{name}.{key}" if dict_names else f"{name}.[dict_= value]" + _add_type_record(subname, str(type(subvalue))) + return + except AttributeError: + # (Wasn't a dict or anything resembling one.) + pass + + # str is iterable, but not in the way we want! + if isinstance(value, str): + return + + try: + for elem in value: + _add_type_record(f"{name}.[list_elem]", str(type(elem))) + except TypeError: + # (Wasn't a list or anything else iterable.) + pass + + +def show_types() -> None: + """ + Print all of the currently known variable types to stdout. + """ + print(json.dumps(OBSERVED_TYPES, indent=3D2)) + + +def record_locals(show: bool =3D False, dict_names: bool =3D False) -> Non= e: + caller =3D caller_frame() + name =3D caller.f_code.co_name + for key, value in caller.f_locals.items(): + record_type(f"{name}.{key}", value, dict_names=3Ddict_names) + if show: + show_types() --=20 2.26.2