port: advance VC6 compatibility frontier

2026-10-02 17:38:23 +00:00
parent df99608491
commit 01a7105be9
16 changed files with 20324 additions and 5 deletions
@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+"""Check C89 declaration placement in immutable stringlib partitions."""
+import sys
+from pathlib import Path
+
+if len(sys.argv) != 2:
+    raise SystemExit("usage: vc6-stringlib-partition-c89.test.py partition.h")
+source = Path(sys.argv[1]).read_text()
+expected_orders = {
+    "partition": (
+        "Py_INCREF(str_obj);",
+        "empty = (PyObject*)STRINGLIB_GET_EMPTY();",
+        "assert(empty != NULL);",
+        "Py_INCREF(empty);",
+        "PyTuple_SET_ITEM(out, 1, empty);",
+        "Py_INCREF(empty);",
+        "PyTuple_SET_ITEM(out, 2, empty);",
+    ),
+    "rpartition": (
+        "empty = (PyObject*)STRINGLIB_GET_EMPTY();",
+        "assert(empty != NULL);",
+        "Py_INCREF(empty);",
+        "PyTuple_SET_ITEM(out, 0, empty);",
+        "Py_INCREF(empty);",
+        "PyTuple_SET_ITEM(out, 1, empty);",
+        "Py_INCREF(str_obj);",
+        "PyTuple_SET_ITEM(out, 2, (PyObject*) str_obj);",
+    ),
+}
+for name, order in expected_orders.items():
+    signature = "STRINGLIB(" + name + ")("
+    start = source.index(signature)
+    body_start = source.index("\n{\n", start) + 2
+    body_end = source.index("\n}\n", body_start)
+    body = source[body_start:body_end]
+    opening, no_match = body.split("    if (pos < 0)", 1)
+    if "#if !STRINGLIB_MUTABLE\n    PyObject *empty;\n#endif" not in opening:
+        raise SystemExit(name + ": empty must be declared in the C89 entry declaration group")
+    if body.count("PyObject *empty;") != 1 or "PyObject *empty =" in body:
+        raise SystemExit(name + ": empty must have one separate declaration")
+    branch_start = no_match.index("#else")
+    branch_end = no_match.index("#endif", branch_start)
+    branch = no_match[branch_start:branch_end]
+    cursor = 0
+    for statement in order:
+        position = branch.find(statement, cursor)
+        if position < 0:
+            raise SystemExit(name + ": empty reference-count / tuple insertion order changed")
+        cursor = position + len(statement)
+print("stringlib partition C89 declarations and ownership order: PASS")