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# build-aux/measurestack/util.py - Analyze stack sizes for compiled objects
#
# Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
import re
import typing
from . import analyze, vcg
from .analyze import BaseName, Node, QName, maybe_sorted
# pylint: disable=unused-variable
__all__ = [
"synthetic_node",
"read_source",
"get_zero_or_one",
"re_call_other",
"Plugin",
"PluginApplication",
]
def synthetic_node(
name: str, nstatic: int, calls: typing.Collection[str] = frozenset()
) -> Node:
n = Node()
n.funcname = QName(name)
n.location = "<synthetic>"
n.usage_kind = "static"
n.nstatic = nstatic
n.ndynamic = 0
n.calls = dict((QName(c), False) for c in maybe_sorted(calls))
return n
re_location = re.compile(r"(?P<filename>.+):(?P<row>[0-9]+):(?P<col>[0-9]+)")
def read_source(location: str) -> str:
m = re_location.fullmatch(location)
if not m:
raise ValueError(f"unexpected label value {location!r}")
filename = m.group("filename")
row = int(m.group("row")) - 1
# col = int(m.group("col")) - 1
with open(filename, "r", encoding="utf-8") as fh:
return fh.readlines()[row].strip()
def get_zero_or_one(
pred: typing.Callable[[str], bool], fnames: typing.Collection[str]
) -> str | None:
count = sum(1 for fname in fnames if pred(fname))
assert count < 2
if count:
return next(fname for fname in fnames if pred(fname))
return None
re_call_other = re.compile(r".*?\b(?P<func>(?!if\b)[->.a-zA-Z0-9_]+)\(.*")
class Plugin(typing.Protocol):
def is_intrhandler(self, name: QName) -> bool: ...
# init_array returns a list of functions that are placed in the
# `.init_array.*` section; AKA functions marked with
# `__attribute__((constructor))`.
def init_array(self) -> typing.Collection[QName]: ...
# extra_includes returns a list of functions that are never
# called, but are included in the binary anyway. This may because
# it is an unused method in a used vtable. This may be because it
# is an atexit() callback (we never exit).
def extra_includes(self) -> typing.Collection[BaseName]: ...
def extra_nodes(self) -> typing.Collection[Node]: ...
def mutate_node(self, node: Node) -> None: ...
def indirect_callees(
self, loc: str, line: str
) -> tuple[typing.Collection[QName], bool] | None: ...
def skipmodels(self) -> dict[BaseName, analyze.SkipModel]: ...
class PluginApplication:
_location_xform: typing.Callable[[str], str]
_plugins: list[Plugin]
def __init__(
self, location_xform: typing.Callable[[str], str], plugins: list[Plugin]
) -> None:
self._location_xform = location_xform
self._plugins = plugins
def extra_nodes(self) -> typing.Collection[Node]:
ret: list[Node] = []
for plugin in self._plugins:
ret.extend(plugin.extra_nodes())
return ret
def mutate_node(self, node: Node) -> None:
for plugin in self._plugins:
plugin.mutate_node(node)
def indirect_callees(
self, elem: vcg.VCGElem
) -> tuple[typing.Collection[QName], bool]:
loc = elem.attrs.get("label", "")
line = read_source(loc)
for plugin in self._plugins:
ret = plugin.indirect_callees(loc, line)
if ret is not None:
assert (
len(ret[0]) > 0
), f"{plugin.__class__.__name__} returning 0 calles for {loc} indicates the code would crash"
return ret
placeholder = "__indirect_call"
if m := re_call_other.fullmatch(line):
placeholder += ":" + m.group("func")
placeholder += " at " + self._location_xform(elem.attrs.get("label", ""))
return [QName(placeholder)], False
def skipmodels(self) -> dict[BaseName, analyze.SkipModel]:
ret: dict[BaseName, analyze.SkipModel] = {}
for plugin in self._plugins:
ret.update(plugin.skipmodels())
return ret
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