JSClass.flags
the jsclass.flags field allows an application to enable optional jsclass features on a per-class basis.

Index
92 jsclass.flags jsapi reference, spidermonkey the flags field is of type uint32_t.
... 103 jsextendedclass.wrappedobject jsapi reference, obsolete, spidermonkey if a class has the jsclass_is_extended bit set in its jsclass.flags and has a non-null jsextendedclass.wrappedobject, then objects of that class may be wrappers.
...the native ops (js_objectops, see js/src/jsobj.cpp) access slots reserved by including a call to the jsclass_has_reserved_slots(n) macro in the jsclass.flags initializer.

JSClass
this field is the bitwise or of one or more of the jsclass_* constants described in jsclass.flags.
... js_reportoutofmemory(cx); return false; } js_setprivate(cx, obj, p); args.rval().setobject(*obj); /* spidermonkey 31 or older * js_set_rval(cx, vp, object_to_jsval(obj)); */ return true; } { js_initclass(cx, global, js::null(), &printer_class, printer_construct, 1, null, null, null, null); } see also mxr id search for jsclass jsclass.flags js_getclass js_initclass js_newobject js_newobjectforconstructor js_instanceof bug 638291 - added trace bug 702507 - removed jsclass_construct_prototype bug 726944 - removed xdrobject, reserved0 and reserved1 bug 886829 - made finalize optional bug 957688 - removed checkaccess bug 1103368 - made most of members optional bug 1097267 - removed jsclass_new_enumerate bug 1054756 - remove...

JSNewResolveOp
jsnewresolveop is the type of the jsclass.resolve callback when the jsclass_new_resolve bit is set in the jsclass.flags field.
...this hook instead of jsresolveop is called via the jsclass.resolve member if jsclass_new_resolve is set in jsclass.flags.

JSReserveSlotsOp
the optional jsclass.reserveslots hook allows a class to make computed per-instance object slots reservations, in addition to or instead of using jsclass_has_reserved_slots(n) in the jsclass.flags initializer to reserve a constant-per-class number of slots.
... implementations of this hook should return the number of slots to reserve, not including any reserved by using jsclass_has_reserved_slots(n) in jsclass.flags.

JSAPI reference
struct jsclass jsclass.flags jsclass.call jsclass.construct struct jsfunctionspec struct jspropertyspec js_initclass js_linkconstructorandprototype added in spidermonkey 17 js::propertyspecnameissymbol added in spidermonkey 38 js::propertyspecnameequalsid added in spidermonkey 38 js::propertyspecnametopermanentid added in spidermonkey 38 js_getreservedslot js_setreservedslot struct jsextendedclass obs...
... js_fs_end added in spidermonkey 1.8 struct jspropertyspec js_psg added in spidermonkey 17 js_psgs added in spidermonkey 17 js_self_hosted_get added in spidermonkey 31 js_self_hosted_getset added in spidermonkey 31 js_ps_end added in spidermonkey 17 jsfastnative added in spidermonkey 1.8 obsolete since javascript 1.8.5 the behavior of a jsclass can be customized using these flags: jsclass.flags jsclass_has_private jsclass_private_is_nsisupports jsclass_is_domjsclass added in spidermonkey 17 jsclass_implements_barriers added in spidermonkey 17 jsclass_emulates_undefined added in spidermonkey 24 jsclass_has_reserved_slots(n) jsclass_global_flags jsclass_new_enumerate obsolete since jsapi 37 jsclass_new_resolve obsolete since jsapi 36 jsclass_share_all_pro...

JSExtendedClass.wrappedObject
description if a class has the jsclass_is_extended bit set in its jsclass.flags and has a non-null jsextendedclass.wrappedobject, then objects of that class may be wrappers.

JSNewEnumerateOp
to use a jsnewenumerateop in a jsclass, set the jsclass_new_enumerate bit in the jsclass.flags field and set the jsclass.enumerate field to your jsnewenumerateop, casting it to jsenumerateop.

JSObjectOps.getRequiredSlot
the native ops (js_objectops, see js/src/jsobj.cpp) access slots reserved by including a call to the jsclass_has_reserved_slots(n) macro in the jsclass.flags initializer.

SpiderMonkey 1.8.8
the jsresolve_classname and jsresolve_with resolve flags (passed to jsclass.resolve when jsclass.flags contains jsclass_new_resolve) have been removed.

SpiderMonkey 17
the jsresolve_classname and jsresolve_with resolve flags (passed to jsclass.resolve when jsclass.flags contains jsclass_new_resolve) have been removed.