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bpo-38140: Make dict and weakref offsets opaque for C heap types (#16076)

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* Make dict and weakref offsets opaque for C heap types

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This commit is contained in:
Eddie Elizondo 2019-09-19 09:29:05 -07:00 • committed by Dino Viehland
parent 079931d122
commit 3368f3c6ae
8 changed files with 188 additions and 8 deletions
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8
Parser/asdl_c.py
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@ -724,6 +724,11 @@ ast_type_reduce(PyObject *self, PyObject *unused)
return Py_BuildValue("O()", Py_TYPE(self));
}
static PyMemberDef ast_type_members[] = {
{"__dictoffset__", T_PYSSIZET, offsetof(AST_object, dict), READONLY},
{NULL} /* Sentinel */
};
static PyMethodDef ast_type_methods[] = {
{"__reduce__", ast_type_reduce, METH_NOARGS, NULL},
{NULL}
@ -740,6 +745,7 @@ static PyType_Slot AST_type_slots[] = {
{Py_tp_setattro, PyObject_GenericSetAttr},
{Py_tp_traverse, ast_traverse},
{Py_tp_clear, ast_clear},
{Py_tp_members, ast_type_members},
{Py_tp_methods, ast_type_methods},
{Py_tp_getset, ast_type_getsets},
{Py_tp_init, ast_type_init},
@ -930,7 +936,6 @@ static int add_ast_fields(void)
self.emit("if (init_identifiers() < 0) return 0;", 1)
self.emit("state->AST_type = PyType_FromSpec(&AST_type_spec);", 1)
self.emit("if (!state->AST_type) return 0;", 1)
self.emit("((PyTypeObject*)state->AST_type)->tp_dictoffset = offsetof(AST_object, dict);", 1)
self.emit("if (add_ast_fields() < 0) return 0;", 1)
for dfn in mod.dfns:
self.visit(dfn)
@ -1372,6 +1377,7 @@ def main(srcfile, dump_module=False):
f.write('\n')
f.write('#include "Python.h"\n')
f.write('#include "%s-ast.h"\n' % mod.name)
f.write('#include "structmember.h"\n')
f.write('\n')
generate_module_def(f, mod)