port: advance VC6 typeobject frontier and preserve regression coverage

2026-10-26 18:09:33 +00:00
parent 35caf1a558
commit 5ab291a68c
162 changed files with 15675 additions and 85 deletions
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""Guard _PyObject_Calloc's C89 declarations and original operation order."""
+
+import re
+import sys
+from pathlib import Path
+
+source = Path(sys.argv[1]).read_text()
+match = re.search(
+    r"\n_PyObject_Calloc\(void \*ctx, size_t nelem, size_t elsize\)\s*\{(.*?)\n\}",
+    source, re.S,
+)
+assert match, "_PyObject_Calloc definition not found"
+body = re.sub(r"/\*.*?\*/", "", match.group(1), flags=re.S)
+assert body.split()[:4] == ["size_t", "nbytes;", "void*", "ptr;"], (
+    "_PyObject_Calloc must declare nbytes and ptr without initializers at function entry"
+)
+
+# Keep multiplication after the overflow assertion, allocation after the size
+# calculation, and zeroing, fallback allocation, and accounting in their order.
+expected = """
+    size_t nbytes;
+    void* ptr;
+    assert(elsize == 0 || nelem <= (size_t)PY_SSIZE_T_MAX / elsize);
+    nbytes = nelem * elsize;
+    ptr = pymalloc_alloc(ctx, nbytes);
+    if (LIKELY(ptr != NULL)) {
+        memset(ptr, 0, nbytes);
+        return ptr;
+    }
+    ptr = PyMem_RawCalloc(nelem, elsize);
+    if (ptr != NULL) {
+        raw_allocated_blocks++;
+    }
+    return ptr;
+"""
+assert body.split() == expected.split(), (
+    "preserve _PyObject_Calloc assertion, evaluation, zeroing, fallback, and accounting order"
+)
+print("obmalloc _PyObject_Calloc nbytes/ptr entry declarations and original operation order: PASS")