81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
#!/usr/bin/env python3
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"""Check only update_arg's first declaration frontier, before later blockers."""
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import re
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import subprocess
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import sys
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import tempfile
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from pathlib import Path
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source = Path(sys.argv[1]).read_text()
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match = re.search(
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r"static int\nmutablemapping_update_arg\(PyObject \*self, PyObject \*arg\)\n\{"
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r".*?(?= if \(func != NULL\) \{)", source, re.S,
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)
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assert match, "mutablemapping_update_arg prefix not found"
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# Compile the untouched prefix only: iterator/key declarations farther down
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# are independent frontier defects. The synthetic tail observes lookup output.
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harness = r'''
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#include <assert.h>
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#include <stddef.h>
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typedef struct { int unused; } PyObject;
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static PyObject self_obj, arg_obj, items_obj, func_obj;
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static int scenario, stage, keys;
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#define _Py_ID(name) name
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static int PyDict_CheckExact(PyObject *arg) {
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assert(stage == 0 && arg == &arg_obj);
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stage = 1;
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return scenario < 3;
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}
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static PyObject *PyDict_Items(PyObject *arg) {
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assert(stage == 1 && arg == &arg_obj);
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stage = 2;
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return scenario == 0 ? NULL : &items_obj;
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}
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static int mutablemapping_add_pairs(PyObject *self, PyObject *items) {
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assert(stage == 2 && self == &self_obj && items == &items_obj);
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stage = 3;
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return scenario == 1 ? -1 : 0;
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}
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static void Py_DECREF(PyObject *obj) {
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assert(stage == 3 && obj == &items_obj);
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stage = 4;
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}
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static int _PyObject_LookupAttr(PyObject *arg, int *id, PyObject **func) {
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assert(stage == 1 && arg == &arg_obj && id == &keys);
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stage = 5;
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*func = scenario == 5 ? &func_obj : NULL;
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return scenario == 3 ? -1 : scenario == 5;
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}
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'''
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harness += match.group(0)
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harness += r'''
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assert(stage == 5 && res == 0);
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assert(func == (scenario == 5 ? &func_obj : NULL));
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stage = 6;
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return 0;
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}
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int main(void) {
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int result;
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for (scenario = 0; scenario < 6; ++scenario) {
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stage = 0;
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result = mutablemapping_update_arg(&self_obj, &arg_obj);
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assert(result == ((scenario < 2 || scenario == 3) ? -1 : 0));
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assert(stage == (scenario == 0 ? 2 : scenario < 3 ? 4 :
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scenario == 3 ? 5 : 6));
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}
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return 0;
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}
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'''
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with tempfile.TemporaryDirectory(prefix="vc6-odict-update-arg-func-") as directory:
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path = Path(directory)
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(path / "test.c").write_text(harness)
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result = subprocess.run([
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"cc", "-std=c89", "-pedantic-errors", "-Wall", "-Wextra", "-Werror",
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str(path / "test.c"), "-o", str(path / "test"),
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])
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if result.returncode:
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sys.exit(result.returncode)
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subprocess.run([str(path / "test")], check=True)
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print("mutablemapping_update_arg prefix C89 compile and dict/lookup ordering: PASS (6 cases)")
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