91 lines
3.9 KiB
Python
91 lines
3.9 KiB
Python
#!/usr/bin/env python3
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"""Compile the exact PickleBuffer type as C89 and verify every static slot."""
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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 = Path(sys.argv[1])
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source = source_path.read_text()
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match = re.search(r"PyTypeObject PyPickleBuffer_Type = \{.*?\n\};", source, re.S)
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assert match, "PyPickleBuffer_Type initializer not found"
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header = (source_path.parent.parent / "Include/cpython/object.h").read_text()
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layout = re.search(r"struct _typeobject \{(.*?)\n\};", header, re.S)
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assert layout, "PyTypeObject layout not found"
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body = re.sub(r"/\*.*?\*/|//[^\n]*", "", layout.group(1), flags=re.S)
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fields = re.findall(r"\b(tp_\w+)\b", body)
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assert len(fields) == len(set(fields)) == 48, "review changed PyTypeObject layout"
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expected = {
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"tp_name": '"pickle.PickleBuffer"',
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"tp_basicsize": "sizeof(PyPickleBufferObject)",
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"tp_dealloc": "(destructor)picklebuf_dealloc",
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"tp_as_buffer": "&picklebuf_as_buffer",
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"tp_flags": "Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC",
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"tp_doc": '"Wrapper for potentially out-of-band buffers"',
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"tp_traverse": "(traverseproc)picklebuf_traverse",
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"tp_clear": "(inquiry)picklebuf_clear",
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"tp_weaklistoffset": "offsetof(PyPickleBufferObject, weakreflist)",
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"tp_methods": "picklebuf_methods",
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"tp_new": "picklebuf_new",
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}
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assert expected.keys() <= set(fields)
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# Use the real field declarations/order, with minimal stand-ins for dependencies.
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harness = r'''
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#include <assert.h>
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#include <stddef.h>
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#include <string.h>
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typedef long Py_ssize_t;
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typedef struct { int unused; } PyObject;
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typedef struct { int unused; } PyAsyncMethods;
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typedef struct { int unused; } PyNumberMethods;
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typedef struct { int unused; } PySequenceMethods;
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typedef struct { int unused; } PyMappingMethods;
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typedef struct { int unused; } PyBufferProcs;
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typedef struct { int unused; } PyMethodDef;
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typedef struct { int unused; } PyMemberDef;
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typedef struct { int unused; } PyGetSetDef;
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typedef struct _typeobject PyTypeObject;
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typedef struct { int view; PyObject *weakreflist; } PyPickleBufferObject;
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#define PyObject_VAR_HEAD long ob_refcnt; PyTypeObject *ob_type; long ob_size;
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#define PyVarObject_HEAD_INIT(type, size) 1, type, size,
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#define PyDoc_STR(value) value
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#define Py_TPFLAGS_DEFAULT 1UL
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#define Py_TPFLAGS_HAVE_GC 16384UL
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'''
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for name in (
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"destructor getattrfunc setattrfunc reprfunc hashfunc ternaryfunc "
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"getattrofunc setattrofunc traverseproc inquiry richcmpfunc getiterfunc "
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"iternextfunc descrgetfunc descrsetfunc initproc allocfunc newfunc "
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"freefunc vectorcallfunc"
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).split():
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harness += f"typedef void (*{name})(void);\n"
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harness += "struct _typeobject {" + body + "};\n"
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for name in ("new", "dealloc", "traverse", "clear"):
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harness += f"static void picklebuf_{name}(void) {{ }}\n"
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harness += "static PyBufferProcs picklebuf_as_buffer;\n"
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harness += "static PyMethodDef picklebuf_methods[1];\n"
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harness += match.group(0) + "\nint main(void)\n{\n"
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harness += " assert(PyPickleBuffer_Type.ob_refcnt == 1);\n"
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harness += " assert(PyPickleBuffer_Type.ob_type == NULL);\n"
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harness += " assert(PyPickleBuffer_Type.ob_size == 0);\n"
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for field in fields:
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value = expected.get(field, "0")
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if field in ("tp_name", "tp_doc"):
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harness += f" assert(strcmp(PyPickleBuffer_Type.{field}, {value}) == 0);\n"
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else:
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harness += f" assert(PyPickleBuffer_Type.{field} == ({value}));\n"
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harness += " return 0;\n}\n"
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with tempfile.TemporaryDirectory(prefix="vc6-picklebuf-type-") 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("PyPickleBuffer_Type C89 compile and all 48 semantic field mappings: PASS")
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