From: Tim Peters <tim.peters@gmail.com>
Date: Thu, 13 Feb 2003 18:24:14 +0000 (+0000)
Subject: Taught cPickle how to read pickles containing NEWOBJ.  This won't get
X-Git-Tag: v2.3c1~1864
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=eab7db3ceed31404134317b4770aaf154785e600;p=thirdparty%2FPython%2Fcpython.git

Taught cPickle how to read pickles containing NEWOBJ.  This won't get
exercised by the test suite before cPickle knows how to create NEWOBJ
too.  For now, it was just tried once by hand (via loading a NEWOBJ
pickle created by pickle.py).
---

diff --git a/Modules/cPickle.c b/Modules/cPickle.c
index 17da7d7917d9..6601290f4c27 100644
--- a/Modules/cPickle.c
+++ b/Modules/cPickle.c
@@ -3698,6 +3698,53 @@ load_inst(Unpicklerobject *self)
 	return 0;
 }
 
+static int
+load_newobj(Unpicklerobject *self)
+{
+	PyObject *args = NULL;
+	PyObject *clsraw = NULL;
+	PyTypeObject *cls;	/* clsraw cast to its true type */
+	PyObject *obj;
+
+	/* Stack is ... cls argtuple, and we want to call
+	 * cls.__new__(cls, *argtuple).
+	 */
+	PDATA_POP(self->stack, args);
+	if (args == NULL) goto Fail;
+	if (! PyTuple_Check(args)) {
+		PyErr_SetString(UnpicklingError, "NEWOBJ expected an arg "
+						 "tuple.");
+		goto Fail;
+	}
+
+	PDATA_POP(self->stack, clsraw);
+	cls = (PyTypeObject *)clsraw;
+	if (cls == NULL) goto Fail;
+	if (! PyType_Check(cls)) {
+		PyErr_SetString(UnpicklingError, "NEWOBJ class argument "
+					 	 "isn't a type object");
+		goto Fail;
+	}
+	if (cls->tp_new == NULL) {
+		PyErr_SetString(UnpicklingError, "NEWOBJ class argument "
+						 "has NULL tp_new");
+		goto Fail;
+	}
+
+	/* Call __new__. */
+	obj = cls->tp_new(cls, args, NULL);
+	if (obj == NULL) goto Fail;
+
+ 	Py_DECREF(args);
+ 	Py_DECREF(clsraw);
+	PDATA_PUSH(self->stack, obj, -1);
+ 	return 0;
+
+ Fail:
+ 	Py_XDECREF(args);
+ 	Py_XDECREF(clsraw);
+ 	return -1;
+}
 
 static int
 load_global(Unpicklerobject *self)
@@ -4461,6 +4508,11 @@ load(Unpicklerobject *self)
 				break;
 			continue;
 
+		case NEWOBJ:
+			if (load_newobj(self) < 0)
+				break;
+			continue;
+
 		case GLOBAL:
 			if (load_global(self) < 0)
 				break;
@@ -4638,10 +4690,27 @@ noload_inst(Unpicklerobject *self)
 	Pdata_clear(self->stack, i);
 	if (self->readline_func(self, &s) < 0) return -1;
 	if (self->readline_func(self, &s) < 0) return -1;
-	PDATA_APPEND(self->stack, Py_None,-1);
+	PDATA_APPEND(self->stack, Py_None, -1);
 	return 0;
 }
 
+static int
+noload_newobj(Unpicklerobject *self)
+{
+	PyObject *obj;
+
+	PDATA_POP(self->stack, obj);	/* pop argtuple */
+	if (obj == NULL) return -1;
+	Py_DECREF(obj);
+
+	PDATA_POP(self->stack, obj);	/* pop cls */
+	if (obj == NULL) return -1;
+	Py_DECREF(obj);
+
+	PDATA_APPEND(self->stack, Py_None, -1);
+ 	return 0;
+}
+
 static int
 noload_global(Unpicklerobject *self)
 {
@@ -4829,6 +4898,11 @@ noload(Unpicklerobject *self)
 				break;
 			continue;
 
+		case NEWOBJ:
+			if (noload_newobj(self) < 0)
+				break;
+			continue;
+
 		case GLOBAL:
 			if (noload_global(self) < 0)
 				break;