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Diffstat (limited to 'build-aux/stack.py')
| -rw-r--r-- | build-aux/stack.py | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/build-aux/stack.py b/build-aux/stack.py deleted file mode 100644 index 752cefb..0000000 --- a/build-aux/stack.py +++ /dev/null @@ -1,192 +0,0 @@ -#!/usr/bin/env python3 -# build-aux/stack.py - Analyze stack sizes for compiled objects -# -# Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com> -# SPDX-License-Identifier: AGPL-3.0-or-later - -import re -import sys -import typing - -# Parse the "VCG" language -# -# https://www.rw.cdl.uni-saarland.de/people/sander/private/html/gsvcg1.html -# -# The formal syntax is found at -# ftp://ftp.cs.uni-sb.de/pub/graphics/vcg/vcg.tgz `doc/grammar.txt`. - - -class VCGElem: - typ: str - lineno: int - attrs: dict[str, str] - - -def parse_vcg(reader: typing.TextIO) -> typing.Iterator[VCGElem]: - re_beg = re.compile(r"(edge|node):\s*\{\s*") - _re_tok = r"[a-zA-Z_][a-zA-Z0-9_]*" - _re_str = r'"(?:[^\"]|\\.)*"' - re_attr = re.compile( - "(" + _re_tok + r")\s*:\s*(" + _re_tok + "|" + _re_str + r")\s*" - ) - re_end = re.compile(r"\}\s*$") - re_skip = re.compile(r"(graph:\s*\{\s*title\s*:\s*" + _re_str + r"\s*|\})\s*") - re_esc = re.compile(r"\\.") - - for lineno, line in enumerate(reader): - pos = 0 - - def _raise(msg: str) -> typing.NoReturn: - nonlocal lineno - nonlocal line - nonlocal pos - e = SyntaxError(msg) - e.lineno = lineno - e.offset = pos - e.text = line - raise e - - if re_skip.fullmatch(line): - continue - - elem = VCGElem() - elem.lineno = lineno - - m = re_beg.match(line, pos=pos) - if not m: - _raise("does not look like a VCG line") - elem.typ = m.group(1) - pos = m.end() - - elem.attrs = {} - while True: - if re_end.match(line, pos=pos): - break - m = re_attr.match(line, pos=pos) - if not m: - _raise("unexpected character") - k = m.group(1) - v = m.group(2) - if k in elem.attrs: - _raise(f"duplicate key: {repr(k)}") - if v.startswith('"'): - - def unesc(esc: re.Match[str]) -> str: - match esc.group(0)[1:]: - case "n": - return "\n" - case '"': - return '"' - case "\\": - return "\\" - case _: - _raise(f"invalid escape code {repr(esc.group(0))}") - - v = re_esc.sub(unesc, v[1:-1]) - elem.attrs[k] = v - pos = m.end() - - yield elem - - -class Node: - # from .title (`static` functions are prefixed with the - # compilation unit .c file, which is fine, we'll just leave it). - funcname: str - # .label is "{funcname}\n{location}\n{nstatic} bytes (static}\n{ndynamic} dynamic objects" - location: str - nstatic: int - ndynamic: int - - # edges with .sourcename set to this node - calls: set[str] - - -def main() -> None: - re_label = re.compile( - r"(?P<funcname>[^\n]+)\n" - + r"(?P<location>[^\n]+:[0-9]+:[0-9]+)\n" - + r"(?P<nstatic>[0-9]+) bytes \(static\)\n" - + r"(?P<ndynamic>[0-9]+) dynamic objects", - flags=re.MULTILINE, - ) - - graph: dict[str, Node] = dict() - - for elem in parse_vcg(sys.stdin): - match elem.typ: - case "node": - node = Node() - node.calls = set() - skip = False - for k, v in elem.attrs.items(): - match k: - case "title": - node.funcname = v - case "label": - if elem.attrs.get("shape", "") != "ellipse": - m = re_label.fullmatch(v) - if not m: - raise ValueError( - f"unexpected label value {repr(v)}" - ) - node.location = m.group("location") - node.nstatic = int(m.group("nstatic")) - node.ndynamic = int(m.group("ndynamic")) - case "shape": - if v != "ellipse": - raise ValueError(f"unexpected shape value {repr(v)}") - skip = True - case _: - raise ValueError(f"unknown edge key {repr(k)}") - if not skip: - if node.funcname in graph: - raise ValueError(f"duplicate node {repr(node.funcname)}") - graph[node.funcname] = node - case "edge": - caller: str | None = None - callee: str | None = None - for k, v in elem.attrs.items(): - match k: - case "sourcename": - caller = v - case "targetname": - callee = v - case "label": - pass - case _: - raise ValueError(f"unknown edge key {repr(k)}") - if caller is None or callee is None: - raise ValueError(f"incomplete edge: {repr(elem.attrs)}") - if caller not in graph: - raise ValueError(f"unknown caller: {caller}") - graph[caller].calls.add(callee) - case _: - raise ValueError(f"unknown elem type {repr(elem.typ)}") - - # x - - missing: set[str] = set() - - def nstatic(funcname: str) -> int: - if funcname not in graph: - missing.add(funcname) - return 0 - node = graph[funcname] - return node.nstatic + max([0, *[nstatic(call) for call in node.calls]]) - - namelen = max(len(name) for name in graph if name.endswith("_cr")) - print(("=" * namelen) + " =======") - - for funcname in graph: - if funcname.endswith("_cr"): - print(f"{funcname}\t{nstatic(funcname)}") - - print(("=" * namelen) + " =======") - - for funcname in sorted(missing): - print(f"{funcname}\tmissing") - - -if __name__ == "__main__": - main() |