port: advance VC6 frontier into frameobject

2026-10-02 19:11:50 +00:00
parent 01a7105be9
commit 9221a2ee0e
6 changed files with 3935 additions and 5 deletions
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+"""Guard VC6 C89 declaration order in PyFile_OpenCodeObject."""
+import sys
+from pathlib import Path
+from typing import NoReturn
+
+
+def fail(message: str) -> NoReturn:
+    print(message, file=sys.stderr)
+    raise SystemExit(1)
+
+
+def function_body(source, signature):
+    start = source.find(signature)
+    if start < 0:
+        fail(f"missing function signature: {signature}")
+    brace = source.find("{", start + len(signature))
+    if brace < 0:
+        fail("missing function body")
+    depth = 0
+    for end in range(brace, len(source)):
+        if source[end] == "{":
+            depth += 1
+        elif source[end] == "}":
+            depth -= 1
+            if depth == 0:
+                return source[brace + 1:end]
+    fail("unterminated function body")
+
+
+path = Path(sys.argv[1])
+source = path.read_text(encoding="utf-8")
+body = function_body(source, "PyFile_OpenCodeObject(PyObject *path)")
+expected_decl = "    Py_OpenCodeHookFunction hook;"
+if expected_decl not in body:
+    fail("hook must be declared without initializer at function entry")
+if "Py_OpenCodeHookFunction hook =" in body:
+    fail("hook declaration must not be initialized at declaration")
+validation = body.find("if (!PyUnicode_Check(path))")
+assignment = body.find("hook = _PyRuntime.open_code_hook;")
+if validation < 0 or assignment < 0 or assignment < validation:
+    fail("hook lookup must remain after path validation")
+if body.find("return NULL;", validation) > assignment:
+    fail("hook lookup must remain after invalid-path early return")
+print("fileobject open-code hook C89 declaration and validation order: PASS")