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 +1,95 @@
+#!/usr/bin/env python3
+"""Compile the exact range_index body as C89 and check evaluation order."""
+import re
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+source = Path(sys.argv[1]).read_text()
+match = re.search(
+    r"static PyObject \*\nrange_index\([^\n]+\)\n\{.*?\n\}", source, re.S
+)
+assert match, "range_index not found"
+harness = r'''
+#include <assert.h>
+#include <stddef.h>
+#include <string.h>
+typedef long Py_ssize_t;
+typedef struct { int unused; } PyObject;
+typedef struct { PyObject *start, *step; } rangeobject;
+#define PY_ITERSEARCH_INDEX 2
+static int PyExc_ValueError = 1;
+static int scenario;
+static char events[16];
+static PyObject ob, start, step, one, idx, quotient, converted;
+static rangeobject range;
+static void event(char c) {
+    size_t n = strlen(events);
+    assert(n + 1 < sizeof(events));
+    events[n] = c; events[n + 1] = '\0';
+}
+static int PyLong_CheckExact(PyObject *obj) {
+    assert(obj == &ob); return scenario != 0 && scenario != 1 && scenario != 8;
+}
+static int PyBool_Check(PyObject *obj) {
+    assert(obj == &ob); return scenario == 8;
+}
+static Py_ssize_t _PySequence_IterSearch(PyObject *obj, PyObject *value, int op) {
+    assert(obj == (PyObject *)&range && value == &ob && op == PY_ITERSEARCH_INDEX);
+    event('I'); return scenario == 0 ? -1 : 3;
+}
+static PyObject *PyLong_FromSsize_t(Py_ssize_t value) {
+    assert(value == 3); event('L'); return &converted;
+}
+static int range_contains_long(rangeobject *r, PyObject *value) {
+    assert(r == &range && value == &ob); event('C');
+    return scenario == 2 ? -1 : scenario != 3;
+}
+static PyObject *PyNumber_Subtract(PyObject *value, PyObject *first) {
+    assert(value == &ob && first == &start); event('S');
+    return scenario == 4 ? NULL : &idx;
+}
+static PyObject *_PyLong_GetOne(void) { event('O'); return &one; }
+static PyObject *PyNumber_FloorDivide(PyObject *value, PyObject *divisor) {
+    assert(value == &idx && divisor == &step); event('F');
+    return scenario == 6 ? NULL : &quotient;
+}
+static void Py_DECREF(PyObject *value) { assert(value == &idx); event('D'); }
+static void PyErr_Format(int exc, const char *format, PyObject *value) {
+    assert(exc == PyExc_ValueError && value == &ob);
+    assert(strcmp(format, "%R is not in range") == 0); event('E');
+}
+'''
+harness += match.group(0)
+harness += r'''
+int main(void) {
+    static const char *expected[] = {
+        "I", "IL", "C", "CE", "CS", "CSO", "CSOFD", "CSOFD", "CSOFD"
+    };
+    PyObject *result;
+    for (scenario = 0; scenario < 9; ++scenario) {
+        range.start = &start;
+        range.step = scenario == 5 ? &one : &step;
+        events[0] = '\0';
+        result = range_index(&range, &ob);
+        assert(strcmp(events, expected[scenario]) == 0);
+        if (scenario == 1) assert(result == &converted);
+        else if (scenario == 5) assert(result == &idx);
+        else if (scenario == 7 || scenario == 8) assert(result == &quotient);
+        else assert(result == NULL);
+    }
+    return 0;
+}
+'''
+with tempfile.TemporaryDirectory(prefix="vc6-rangeobject-index-") as directory:
+    path = Path(directory)
+    (path / "test.c").write_text(harness)
+    result = subprocess.run([
+        "cc", "-std=c89", "-pedantic-errors", "-Wall", "-Wextra", "-Werror",
+        "-Wno-unused-parameter", str(path / "test.c"), "-o", str(path / "test"),
+    ])
+    if result.returncode:
+        sys.exit(result.returncode)
+    subprocess.run([str(path / "test")], check=True)
+print("range_index C89 compile and evaluation/cleanup order: PASS (9 cases)")