JSObject *
js_InitExceptionClasses(JSContext *cx, JSObject *obj)
{
JSObject *obj_proto, *protos[JSEXN_LIMIT];
int i;
/*
* If lazy class initialization occurs for any Error subclass, then all
* classes are initialized, starting with Error. To avoid reentry and
* redundant initialization, we must not pass a null proto parameter to
* js_NewObject below, when called for the Error superclass. We need to
* ensure that Object.prototype is the proto of Error.prototype.
*
* See the equivalent code to ensure that parent_proto is non-null when
* JS_InitClass calls js_NewObject, in jsapi.c.
*/
if (!js_GetClassPrototype(cx, obj, INT_TO_JSID(JSProto_Object),
&obj_proto)) {
return NULL;
}
if (!js_EnterLocalRootScope(cx))
return NULL;
/* Initialize the prototypes first. */
for (i = 0; exceptions[i].name != 0; i++) {
JSAtom *atom;
JSFunction *fun;
JSString *nameString;
int protoIndex = exceptions[i].protoIndex;
/* Make the prototype for the current constructor name. */
protos[i] = js_NewObject(cx, &js_ErrorClass,
(protoIndex != JSEXN_NONE)
? protos[protoIndex]
: obj_proto,
obj, 0);
if (!protos[i])
break;
/* So exn_finalize knows whether to destroy private data. */
STOBJ_SET_SLOT(protos[i], JSSLOT_PRIVATE, JSVAL_VOID);
/* Make a constructor function for the current name. */
atom = cx->runtime->atomState.classAtoms[exceptions[i].key];
fun = js_DefineFunction(cx, obj, atom, exceptions[i].native, 3, 0);
if (!fun)
break;
/* Make this constructor make objects of class Exception. */
fun->u.n.clasp = &js_ErrorClass;
/* Make the prototype and constructor links. */
if (!js_SetClassPrototype(cx, FUN_OBJECT(fun), protos[i],
JSPROP_READONLY | JSPROP_PERMANENT)) {
break;
}
/* proto bootstrap bit from JS_InitClass omitted. */
nameString = JS_NewStringCopyZ(cx, exceptions[i].name);
if (!nameString)
break;
/* Add the name property to the prototype. */
if (!JS_DefineProperty(cx, protos[i], js_name_str,
STRING_TO_JSVAL(nameString),
NULL, NULL,
JSPROP_ENUMERATE)) {
break;
}
/* Finally, stash the constructor for later uses. */
if (!js_SetClassObject(cx, obj, exceptions[i].key, FUN_OBJECT(fun)))
break;
}
js_LeaveLocalRootScope(cx);
if (exceptions[i].name)
return NULL;
/*
* Add an empty message property. (To Exception.prototype only,
* because this property will be the same for all the exception
* protos.)
*/
if (!JS_DefineProperty(cx, protos[0], js_message_str,
STRING_TO_JSVAL(cx->runtime->emptyString),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
if (!JS_DefineProperty(cx, protos[0], js_fileName_str,
STRING_TO_JSVAL(cx->runtime->emptyString),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
if (!JS_DefineProperty(cx, protos[0], js_lineNumber_str,
INT_TO_JSVAL(0),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
/*
* Add methods only to Exception.prototype, because ostensibly all
* exception types delegate to that.
*/
if (!JS_DefineFunctions(cx, protos[0], exception_methods))
return NULL;
return protos[0];
}
JSObject *
js_InitExceptionClasses(JSContext *cx, JSObject *obj)
{
int i;
JSObject *protos[JSEXN_LIMIT];
/* Initialize the prototypes first. */
for (i = 0; exceptions[i].name != 0; i++) {
JSAtom *atom;
JSFunction *fun;
JSString *nameString;
int protoIndex = exceptions[i].protoIndex;
/* Make the prototype for the current constructor name. */
protos[i] = js_NewObject(cx, &ExceptionClass,
(protoIndex != JSEXN_NONE)
? protos[protoIndex]
: NULL,
obj);
if (!protos[i])
return NULL;
/* So exn_finalize knows whether to destroy private data. */
OBJ_SET_SLOT(cx, protos[i], JSSLOT_PRIVATE, JSVAL_VOID);
atom = js_Atomize(cx, exceptions[i].name, strlen(exceptions[i].name), 0);
if (!atom)
return NULL;
/* Make a constructor function for the current name. */
fun = js_DefineFunction(cx, obj, atom, exceptions[i].native, 3, 0);
if (!fun)
return NULL;
/* Make this constructor make objects of class Exception. */
fun->clasp = &ExceptionClass;
/* Make the prototype and constructor links. */
if (!js_SetClassPrototype(cx, fun->object, protos[i],
JSPROP_READONLY | JSPROP_PERMANENT)) {
return NULL;
}
/* proto bootstrap bit from JS_InitClass omitted. */
nameString = JS_NewStringCopyZ(cx, exceptions[i].name);
if (!nameString)
return NULL;
/* Add the name property to the prototype. */
if (!JS_DefineProperty(cx, protos[i], js_name_str,
STRING_TO_JSVAL(nameString),
NULL, NULL,
JSPROP_ENUMERATE)) {
return NULL;
}
}
/*
* Add an empty message property. (To Exception.prototype only,
* because this property will be the same for all the exception
* protos.)
*/
if (!JS_DefineProperty(cx, protos[0], js_message_str,
STRING_TO_JSVAL(cx->runtime->emptyString),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
if (!JS_DefineProperty(cx, protos[0], js_filename_str,
STRING_TO_JSVAL(cx->runtime->emptyString),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
if (!JS_DefineProperty(cx, protos[0], js_lineno_str,
INT_TO_JSVAL(0),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
/*
* Add methods only to Exception.prototype, because ostensibly all
* exception types delegate to that.
*/
if (!JS_DefineFunctions(cx, protos[0], exception_methods))
return NULL;
return protos[0];
}
JSObject *
js_InitExceptionClasses(JSContext *cx, JSObject *obj)
{
jsval roots[3];
JSObject *obj_proto, *error_proto;
jsval empty;
/*
* If lazy class initialization occurs for any Error subclass, then all
* classes are initialized, starting with Error. To avoid reentry and
* redundant initialization, we must not pass a null proto parameter to
* js_NewObject below, when called for the Error superclass. We need to
* ensure that Object.prototype is the proto of Error.prototype.
*
* See the equivalent code to ensure that parent_proto is non-null when
* JS_InitClass calls js_NewObject, in jsapi.c.
*/
if (!js_GetClassPrototype(cx, obj, INT_TO_JSID(JSProto_Object),
&obj_proto)) {
return NULL;
}
memset(roots, 0, sizeof(roots));
JSAutoTempValueRooter tvr(cx, JS_ARRAY_LENGTH(roots), roots);
#ifdef __GNUC__
error_proto = NULL; /* quell GCC overwarning */
#endif
/* Initialize the prototypes first. */
for (intN i = JSEXN_ERR; i != JSEXN_LIMIT; i++) {
JSObject *proto;
JSProtoKey protoKey;
JSAtom *atom;
JSFunction *fun;
/* Make the prototype for the current constructor name. */
proto = js_NewObject(cx, &js_ErrorClass,
(i != JSEXN_ERR) ? error_proto : obj_proto,
obj);
if (!proto)
return NULL;
if (i == JSEXN_ERR) {
error_proto = proto;
roots[0] = OBJECT_TO_JSVAL(proto);
} else {
// We cannot share the root for error_proto and other prototypes
// as error_proto must be rooted until the function returns.
roots[1] = OBJECT_TO_JSVAL(proto);
}
/* So exn_finalize knows whether to destroy private data. */
proto->setPrivate(NULL);
/* Make a constructor function for the current name. */
protoKey = GetExceptionProtoKey(i);
atom = cx->runtime->atomState.classAtoms[protoKey];
fun = js_DefineFunction(cx, obj, atom, Exception, 3, 0);
if (!fun)
return NULL;
roots[2] = OBJECT_TO_JSVAL(FUN_OBJECT(fun));
/* Make this constructor make objects of class Exception. */
FUN_CLASP(fun) = &js_ErrorClass;
/* Make the prototype and constructor links. */
if (!js_SetClassPrototype(cx, FUN_OBJECT(fun), proto,
JSPROP_READONLY | JSPROP_PERMANENT)) {
return NULL;
}
/* Add the name property to the prototype. */
if (!JS_DefineProperty(cx, proto, js_name_str, ATOM_KEY(atom),
NULL, NULL, JSPROP_ENUMERATE)) {
return NULL;
}
/* Finally, stash the constructor for later uses. */
if (!js_SetClassObject(cx, obj, protoKey, FUN_OBJECT(fun)))
return NULL;
}
/*
* Set default values and add methods. We do it only for Error.prototype
* as the rest of exceptions delegate to it.
*/
empty = STRING_TO_JSVAL(cx->runtime->emptyString);
if (!JS_DefineProperty(cx, error_proto, js_message_str, empty,
NULL, NULL, JSPROP_ENUMERATE) ||
!JS_DefineProperty(cx, error_proto, js_fileName_str, empty,
NULL, NULL, JSPROP_ENUMERATE) ||
!JS_DefineProperty(cx, error_proto, js_lineNumber_str, JSVAL_ZERO,
NULL, NULL, JSPROP_ENUMERATE) ||
!JS_DefineFunctions(cx, error_proto, exception_methods)) {
return NULL;
}
return error_proto;
}
