[领域]Javascript Hacking Guide 系列文章 （2007-2-7更新到part6）

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• [领域]javascript hacking guide part 6
• [领域]Javascript Hacking Guide part 1
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• java课程期末考试.zip

rt = JS_NewRuntime(...

cx = JS_NewContext(rt,...

glob = JS_NewObject(cx, &global_class, NULL, NULL);

JS_InitStandardClasses(cx, glob)

JS_DefineFunctions(cx, glob, shell_functions)

extern JSObject *

js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent);

JSClass global_class = {

    "global", JSCLASS_NEW_RESOLVE | JSCLASS_GLOBAL_FLAGS,

    JS_PropertyStub,  JS_PropertyStub,

    JS_PropertyStub,  JS_PropertyStub,

    global_enumerate, (JSResolveOp) global_resolve,

    JS_ConvertStub,   JS_FinalizeStub,

    JSCLASS_NO_OPTIONAL_MEMBERS

};

struct JSClass {

    const char          *name;

    uint32              flags;

<o:p> </o:p>

    /* Mandatory non-null function pointer members. */

    JSPropertyOp        addProperty;

    JSPropertyOp        delProperty;

    JSPropertyOp        getProperty;

    JSPropertyOp        setProperty;

    JSEnumerateOp       enumerate;

    JSResolveOp         resolve;

    JSConvertOp         convert;

    JSFinalizeOp        finalize;

<o:p> </o:p>

    /* Optionally non-null members start here. */

    JSGetObjectOps      getObjectOps;

    JSCheckAccessOp     checkAccess;

    JSNative            call;

    JSNative            construct;

    JSXDRObjectOp       xdrObject;

    JSHasInstanceOp     hasInstance;

    JSMarkOp            mark;

    JSReserveSlotsOp    reserveSlots;

};

/* Bootstrap the ur-object, and make it the default prototype object. */

    if (!proto) {

        if (!js_GetClassId(cx, clasp, &id))

            return NULL;

        if (!js_GetClassPrototype(cx, parent, id, &proto))

            return NULL;

        if (!proto &&

            !js_GetClassPrototype(cx, parent, INT_TO_JSID(JSProto_Object),

                                  &proto)) {

            return NULL;

        }

    }

/* Always call the class's getObjectOps hook if it has one. */

    ops = clasp->getObjectOps

          ? clasp->getObjectOps(cx, clasp)

          : &js_ObjectOps;

ops = &js_ObjectOps;

/*

     * Allocate a zeroed object from the GC heap.  Do this *after* any other

     * GC-thing allocations under js_GetClassPrototype or clasp->getObjectOps,

     * to avoid displacing the newborn root for obj.

     */

    obj = (JSObject *) js_NewGCThing(cx, GCX_OBJECT, sizeof(JSObject));

    if (!obj)

        return NULL;

void *

js_NewGCThing(JSContext *cx, uintN flags, size_t nbytes)

struct JSObject {

    JSObjectMap *map;

    jsval       *slots;

};

struct JSObjectMap {

    jsrefcount  nrefs;          /* count of all referencing objects */

    JSObjectOps *ops;           /* high level object operation vtable */

    uint32      nslots;         /* length of obj->slots vector */

    uint32      freeslot;       /* index of next free obj->slots element */

};

var obj = new Object();

obj.a = 5;

struct JSObjectOps {

    /* Mandatory non-null function pointer members. */

    JSNewObjectMapOp    newObjectMap;

    JSObjectMapOp       destroyObjectMap;

    JSLookupPropOp      lookupProperty;

    JSDefinePropOp      defineProperty;

    JSPropertyIdOp      getProperty;<o:p></o:p>

    JSPropertyIdOp      setProperty;

    JSAttributesOp      getAttributes;

    JSAttributesOp      setAttributes;

    JSPropertyIdOp      deleteProperty;

    JSConvertOp         defaultValue;

    JSNewEnumerateOp    enumerate;

    JSCheckAccessIdOp   checkAccess;

<o:p> </o:p>

    /* Optionally non-null members start here. */

    JSObjectOp          thisObject;

    JSPropertyRefOp     dropProperty;

    JSNative            call;

    JSNative            construct;

    JSXDRObjectOp       xdrObject;

    JSHasInstanceOp     hasInstance;

    JSSetObjectSlotOp   setProto;

    JSSetObjectSlotOp   setParent;

    JSMarkOp            mark;

    JSFinalizeOp        clear;

    JSGetRequiredSlotOp getRequiredSlot;

    JSSetRequiredSlotOp setRequiredSlot;

};

/*

     * Share proto's map only if it has the same JSObjectOps, and only if

     * proto's class has the same private and reserved slots as obj's map

     * and class have.  We assume that if prototype and object are of the

     * same class, they always have the same number of computed reserved

     * slots (returned via clasp->reserveSlots); otherwise, prototype and

     * object classes must have the same (null or not) reserveSlots hook.

     */

    if (proto &&

        (map = proto->map)->ops == ops &&

        ((protoclasp = OBJ_GET_CLASS(cx, proto)) == clasp ||

         (!((protoclasp->flags ^ clasp->flags) &

            (JSCLASS_HAS_PRIVATE |

             (JSCLASS_RESERVED_SLOTS_MASK << JSCLASS_RESERVED_SLOTS_SHIFT))) &&

          protoclasp->reserveSlots == clasp->reserveSlots)))

    {

        /*

         * Default parent to the parent of the prototype, which was set from

         * the parent of the prototype's constructor.

         */

        if (!parent)

            parent = OBJ_GET_PARENT(cx, proto);

<o:p> </o:p>

        /* Share the given prototype's map. */

        obj->map = js_HoldObjectMap(cx, map);

<o:p> </o:p>

        /* Ensure that obj starts with the minimum slots for clasp. */

        nslots = JS_INITIAL_NSLOTS;

    } else {

        /* Leave parent alone.  Allocate a new map for obj. */

        map = ops->newObjectMap(cx, 1, ops, clasp, obj);

        if (!map)

            goto bad;

        obj->map = map;

<o:p> </o:p>

        /* Let ops->newObjectMap set nslots so as to reserve slots. */

        nslots = map->nslots;

    }

/* Allocate a slots vector, with a -1'st element telling its length. */

    newslots = AllocSlots(cx, NULL, nslots);

    if (!newslots) {

        js_DropObjectMap(cx, obj->map, obj);

        obj->map = NULL;

        goto bad;

    }

<o:p> </o:p>

    /* Set the proto, parent, and class properties. */

    newslots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(proto);

    newslots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(parent);

    newslots[JSSLOT_CLASS] = PRIVATE_TO_JSVAL(clasp);

<o:p> </o:p>

    /* Clear above JSSLOT_CLASS so the GC doesn't load uninitialized memory. */

    for (i = JSSLOT_CLASS + 1; i < nslots; i++)

        newslots[i] = JSVAL_VOID;