port: advance VC6 typeobject frontier and preserve regression coverage

scripts/vc6-rangeobject-number-c89.test.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+"""Compile the exact range number table as C89 and check every named slot."""
+
+import re
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+source_path = Path(sys.argv[1])
+source = source_path.read_text()
+match = re.search(r"static PyNumberMethods range_as_number = \{.*?\n\};", source, re.S)
+assert match, "range_as_number initializer not found"
+header = (source_path.parent.parent / "Include/cpython/object.h").read_text()
+layout = re.search(r"typedef struct \{([^{}]*)\} PyNumberMethods;", header, re.S)
+assert layout, "PyNumberMethods layout not found"
+# Use the actual header's order and types; check slots by name, not position.
+body = re.sub(r"/\*.*?\*/", "", layout.group(1), flags=re.S)
+fields = re.findall(r"\b(nb_\w+)\s*;", body)
+assert len(fields) == 36 and len(set(fields)) == 36
+assert len(body.split(";")) == len(fields) + 1, "unparsed header field"
+harness = r'''
+#include <assert.h>
+typedef struct { int value; } PyObject;
+typedef PyObject *(*binaryfunc)(PyObject *, PyObject *);
+typedef PyObject *(*ternaryfunc)(PyObject *, PyObject *, PyObject *);
+typedef PyObject *(*unaryfunc)(PyObject *);
+typedef int (*inquiry)(PyObject *);
+static int range_bool(PyObject *self) { (void)self; return 1; }
+'''
+harness += "typedef struct {" + body + "} PyNumberMethods;\n"
+harness += match.group(0) + "\nint main(void) {\n"
+for field in fields:
+    expected = {"nb_bool": "(inquiry)range_bool"}.get(field, "0")
+    harness += f"    assert(range_as_number.{field} == {expected});\n"
+harness += "    return 0;\n}\n"
+with tempfile.TemporaryDirectory(prefix="vc6-rangeobject-number-") as directory:
+    path = Path(directory)
+    (path / "test.c").write_text(harness)
+    result = subprocess.run([
+        "cc", "-std=c89", "-pedantic-errors", "-Wall", "-Wextra", "-Werror",
+        str(path / "test.c"), "-o", str(path / "test"),
+    ])
+    if result.returncode:
+        sys.exit(result.returncode)
+    subprocess.run([str(path / "test")], check=True)
+print("range_as_number C89 compile and all 36 semantic field mappings: PASS")