DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=4 et sw=4 tw=99: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* An xpcom implementation of the JavaScript nsIID and nsCID objects. */

#include "xpcprivate.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/Attributes.h"
#include "JavaScriptParent.h"
#include "mozilla/StaticPtr.h"

using namespace mozilla::dom;
using namespace JS;

/***************************************************************************/
// nsJSID

NS_IMPL_ISUPPORTS1(nsJSID, nsIJSID)

char nsJSID::gNoString[] = "";

nsJSID::nsJSID()
    : mID(GetInvalidIID()), mNumber(gNoString), mName(gNoString)
{
}

nsJSID::~nsJSID()
{
    if (mNumber && mNumber != gNoString)
        NS_Free(mNumber);
    if (mName && mName != gNoString)
        NS_Free(mName);
}

void nsJSID::Reset()
{
    mID = GetInvalidIID();

    if (mNumber && mNumber != gNoString)
        NS_Free(mNumber);
    if (mName && mName != gNoString)
        NS_Free(mName);

    mNumber = mName = nullptr;
}

bool
nsJSID::SetName(const char* name)
{
    MOZ_ASSERT(!mName || mName == gNoString ,"name already set");
    MOZ_ASSERT(name,"null name");
    mName = NS_strdup(name);
    return mName ? true : false;
}

NS_IMETHODIMP
nsJSID::GetName(char * *aName)
{
    if (!aName)
        return NS_ERROR_NULL_POINTER;

    if (!NameIsSet())
        SetNameToNoString();
    MOZ_ASSERT(mName, "name not set");
    *aName = NS_strdup(mName);
    return *aName ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}

NS_IMETHODIMP
nsJSID::GetNumber(char * *aNumber)
{
    if (!aNumber)
        return NS_ERROR_NULL_POINTER;

    if (!mNumber) {
        if (!(mNumber = mID.ToString()))
            mNumber = gNoString;
    }

    *aNumber = NS_strdup(mNumber);
    return *aNumber ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}

NS_IMETHODIMP_(const nsID*)
nsJSID::GetID()
{
    return &mID;
}

NS_IMETHODIMP
nsJSID::GetValid(bool* aValid)
{
    if (!aValid)
        return NS_ERROR_NULL_POINTER;

    *aValid = IsValid();
    return NS_OK;
}

NS_IMETHODIMP
nsJSID::Equals(nsIJSID* other, bool* _retval)
{
    if (!_retval)
        return NS_ERROR_NULL_POINTER;

    if (!other || mID.Equals(GetInvalidIID())) {
        *_retval = false;
        return NS_OK;
    }

    *_retval = other->GetID()->Equals(mID);
    return NS_OK;
}

NS_IMETHODIMP
nsJSID::Initialize(const char* idString)
{
    if (!idString)
        return NS_ERROR_NULL_POINTER;

    if (*idString != '\0' && mID.Equals(GetInvalidIID())) {
        Reset();

        if (idString[0] == '{') {
            if (mID.Parse(idString)) {
                return NS_OK;
            }

            // error - reset to invalid state
            mID = GetInvalidIID();
        }
    }
    return NS_ERROR_FAILURE;
}

bool
nsJSID::InitWithName(const nsID& id, const char* nameString)
{
    MOZ_ASSERT(nameString, "no name");
    Reset();
    mID = id;
    return SetName(nameString);
}

// try to use the name, if no name, then use the number
NS_IMETHODIMP
nsJSID::ToString(char** _retval)
{
    if (mName && mName != gNoString)
        return GetName(_retval);

    return GetNumber(_retval);
}

const nsID&
nsJSID::GetInvalidIID() const
{
    // {BB1F47B0-D137-11d2-9841-006008962422}
    static const nsID invalid = {0xbb1f47b0, 0xd137, 0x11d2,
                                  {0x98, 0x41, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22}};
    return invalid;
}

//static
already_AddRefed<nsJSID>
nsJSID::NewID(const char* str)
{
    if (!str) {
        NS_ERROR("no string");
        return nullptr;
    }

    nsRefPtr<nsJSID> idObj = new nsJSID();
    NS_ENSURE_SUCCESS(idObj->Initialize(str), nullptr);
    return idObj.forget();
}

//static
already_AddRefed<nsJSID>
nsJSID::NewID(const nsID& id)
{
    nsRefPtr<nsJSID> idObj = new nsJSID();
    idObj->mID = id;
    idObj->mName = nullptr;
    idObj->mNumber = nullptr;
    return idObj.forget();
}


/***************************************************************************/
// Class object support so that we can share prototypes of wrapper

// This class exists just so we can have a shared scriptable helper for
// the nsJSIID class. The instances implement their own helpers. But we
// needed to be able to indicate to the shared prototypes this single flag:
// nsIXPCScriptable::DONT_ENUM_STATIC_PROPS. And having a class to do it is
// the only means we have. Setting this flag on any given instance scriptable
// helper is not sufficient to convey the information that we don't want
// static properties enumerated on the shared proto.

class SharedScriptableHelperForJSIID MOZ_FINAL : public nsIXPCScriptable
{
public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIXPCSCRIPTABLE
    SharedScriptableHelperForJSIID() {}
};

NS_INTERFACE_MAP_BEGIN(SharedScriptableHelperForJSIID)
  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPCScriptable)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(SharedScriptableHelperForJSIID)
NS_IMPL_RELEASE(SharedScriptableHelperForJSIID)

// The nsIXPCScriptable map declaration that will generate stubs for us...
#define XPC_MAP_CLASSNAME           SharedScriptableHelperForJSIID
#define XPC_MAP_QUOTED_CLASSNAME   "JSIID"
#define XPC_MAP_FLAGS               nsIXPCScriptable::DONT_ENUM_STATIC_PROPS |\
                                    nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
#include "xpc_map_end.h" /* This will #undef the above */

static mozilla::StaticRefPtr<nsIXPCScriptable> gSharedScriptableHelperForJSIID;
static bool gClassObjectsWereInited = false;

static void EnsureClassObjectsInitialized()
{
    if (!gClassObjectsWereInited) {
        gSharedScriptableHelperForJSIID = new SharedScriptableHelperForJSIID();

        gClassObjectsWereInited = true;
    }
}

NS_METHOD GetSharedScriptableHelperForJSIID(uint32_t language,
                                            nsISupports** helper)
{
    EnsureClassObjectsInitialized();
    if (language == nsIProgrammingLanguage::JAVASCRIPT) {
        nsCOMPtr<nsIXPCScriptable> temp = gSharedScriptableHelperForJSIID.get();
        temp.forget(helper);
    } else
        *helper = nullptr;
    return NS_OK;
}

/******************************************************/

#define NULL_CID                                                              \
{ 0x00000000, 0x0000, 0x0000,                                                 \
  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }

// We pass nsIClassInfo::DOM_OBJECT so that nsJSIID instances may be created
// in unprivileged scopes.
NS_DECL_CI_INTERFACE_GETTER(nsJSIID)
NS_IMPL_CLASSINFO(nsJSIID, GetSharedScriptableHelperForJSIID,
                  nsIClassInfo::DOM_OBJECT, NULL_CID)

NS_DECL_CI_INTERFACE_GETTER(nsJSCID)
NS_IMPL_CLASSINFO(nsJSCID, nullptr, 0, NULL_CID)

void xpc_DestroyJSxIDClassObjects()
{
    if (gClassObjectsWereInited) {
        NS_IF_RELEASE(NS_CLASSINFO_NAME(nsJSIID));
        NS_IF_RELEASE(NS_CLASSINFO_NAME(nsJSCID));
        gSharedScriptableHelperForJSIID = nullptr;

        gClassObjectsWereInited = false;
    }
}

/***************************************************************************/

NS_INTERFACE_MAP_BEGIN(nsJSIID)
  NS_INTERFACE_MAP_ENTRY(nsIJSID)
  NS_INTERFACE_MAP_ENTRY(nsIJSIID)
  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJSID)
  NS_IMPL_QUERY_CLASSINFO(nsJSIID)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsJSIID)
NS_IMPL_RELEASE(nsJSIID)
NS_IMPL_CI_INTERFACE_GETTER2(nsJSIID, nsIJSID, nsIJSIID)

// The nsIXPCScriptable map declaration that will generate stubs for us...
#define XPC_MAP_CLASSNAME           nsJSIID
#define XPC_MAP_QUOTED_CLASSNAME   "nsJSIID"
#define                             XPC_MAP_WANT_NEWRESOLVE
#define                             XPC_MAP_WANT_ENUMERATE
#define                             XPC_MAP_WANT_HASINSTANCE
#define XPC_MAP_FLAGS               nsIXPCScriptable::DONT_ENUM_STATIC_PROPS |\
                                    nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
#include "xpc_map_end.h" /* This will #undef the above */


nsJSIID::nsJSIID(nsIInterfaceInfo* aInfo)
    : mInfo(aInfo)
{
}

nsJSIID::~nsJSIID() {}

// If mInfo is present we use it and ignore mDetails, else we use mDetails.

NS_IMETHODIMP nsJSIID::GetName(char * *aName)
{
    return mInfo->GetName(aName);
}

NS_IMETHODIMP nsJSIID::GetNumber(char * *aNumber)
{
    char str[NSID_LENGTH];
    const nsIID* id;
    mInfo->GetIIDShared(&id);
    id->ToProvidedString(str);
    *aNumber = (char*) nsMemory::Clone(str, NSID_LENGTH);
    return *aNumber ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}

NS_IMETHODIMP_(const nsID*) nsJSIID::GetID()
{
    const nsIID* id;
    mInfo->GetIIDShared(&id);
    return id;
}

NS_IMETHODIMP nsJSIID::GetValid(bool* aValid)
{
    *aValid = true;
    return NS_OK;
}

NS_IMETHODIMP nsJSIID::Equals(nsIJSID* other, bool* _retval)
{
    if (!_retval)
        return NS_ERROR_NULL_POINTER;

    if (!other) {
        *_retval = false;
        return NS_OK;
    }

    mInfo->IsIID(other->GetID(), _retval);
    return NS_OK;
}

NS_IMETHODIMP nsJSIID::Initialize(const char* idString)
{
    return NS_ERROR_FAILURE;
}

NS_IMETHODIMP nsJSIID::ToString(char** _retval)
{
    return mInfo->GetName(_retval);
}

// static
already_AddRefed<nsJSIID>
nsJSIID::NewID(nsIInterfaceInfo* aInfo)
{
    if (!aInfo) {
        NS_ERROR("no info");
        return nullptr;
    }

    bool canScript;
    if (NS_FAILED(aInfo->IsScriptable(&canScript)) || !canScript)
        return nullptr;

    nsRefPtr<nsJSIID> idObj = new nsJSIID(aInfo);
    return idObj.forget();
}


/* bool resolve (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj, in jsval id); */
NS_IMETHODIMP
nsJSIID::NewResolve(nsIXPConnectWrappedNative* wrapper,
                    JSContext * cx, JSObject * objArg,
                    jsid idArg, uint32_t flags,
                    JSObject * *objp, bool* _retval)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    XPCCallContext ccx(JS_CALLER, cx);

    AutoMarkingNativeInterfacePtr iface(ccx);

    const nsIID* iid;
    mInfo->GetIIDShared(&iid);

    iface = XPCNativeInterface::GetNewOrUsed(iid);

    if (!iface)
        return NS_OK;

    XPCNativeMember* member = iface->FindMember(id);
    if (member && member->IsConstant()) {
        RootedValue val(cx);
        if (!member->GetConstantValue(ccx, iface, val.address()))
            return NS_ERROR_OUT_OF_MEMORY;

        *objp = obj;
        *_retval = JS_DefinePropertyById(cx, obj, id, val, nullptr, nullptr,
                                         JSPROP_ENUMERATE | JSPROP_READONLY |
                                         JSPROP_PERMANENT);
    }

    return NS_OK;
}

/* bool enumerate (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj); */
NS_IMETHODIMP
nsJSIID::Enumerate(nsIXPConnectWrappedNative* wrapper,
                   JSContext * cx, JSObject * objArg, bool* _retval)
{
    // In this case, let's just eagerly resolve...

    RootedObject obj(cx, objArg);
    XPCCallContext ccx(JS_CALLER, cx);

    AutoMarkingNativeInterfacePtr iface(ccx);

    const nsIID* iid;
    mInfo->GetIIDShared(&iid);

    iface = XPCNativeInterface::GetNewOrUsed(iid);

    if (!iface)
        return NS_OK;

    uint16_t count = iface->GetMemberCount();
    for (uint16_t i = 0; i < count; i++) {
        XPCNativeMember* member = iface->GetMemberAt(i);
        if (member && member->IsConstant() &&
            !xpc_ForcePropertyResolve(cx, obj, member->GetName())) {
            return NS_ERROR_UNEXPECTED;
        }
    }
    return NS_OK;
}

/*
 * HasInstance hooks need to find an appropriate reflector in order to function
 * properly. There are two complexities that we need to handle:
 *
 * 1 - Cross-compartment wrappers. Chrome uses over 100 compartments, all with
 *     system principal. The success of an instanceof check should not depend
 *     on which compartment an object comes from. At the same time, we want to
 *     make sure we don't unwrap important security wrappers.
 *     CheckedUnwrap does the right thing here.
 *
 * 2 - Prototype chains. Suppose someone creates a vanilla JS object |a| and
 *     sets its __proto__ to some WN |b|. If |b instanceof nsIFoo| returns true,
 *     one would expect |a instanceof nsIFoo| to return true as well, since
 *     instanceof is transitive up the prototype chain in ECMAScript. Moreover,
 *     there's chrome code that relies on this.
 *
 * This static method handles both complexities, returning either an XPCWN, a
 * DOM object, or null. The object may well be cross-compartment from |cx|.
 */
static JSObject*
FindObjectForHasInstance(JSContext* cx, HandleObject objArg)
{
    RootedObject obj(cx, objArg), proto(cx);

    while (obj && !IS_WN_REFLECTOR(obj) &&
           !IsDOMObject(obj) && !mozilla::jsipc::JavaScriptParent::IsCPOW(obj))
    {
        if (js::IsWrapper(obj)) {
            obj = js::CheckedUnwrap(obj, /* stopAtOuter = */ false);
            continue;
        }
        if (!js::GetObjectProto(cx, obj, &proto))
            return nullptr;
        obj = proto;
    }
    return obj;
}

nsresult
xpc::HasInstance(JSContext* cx, HandleObject objArg, const nsID* iid, bool* bp)
{
    *bp = false;

    RootedObject obj(cx, FindObjectForHasInstance(cx, objArg));
    if (!obj)
        return NS_OK;

    if (IsDOMObject(obj)) {
        // Not all DOM objects implement nsISupports. But if they don't,
        // there's nothing to do in this HasInstance hook.
        nsISupports* identity = UnwrapDOMObjectToISupports(obj);
        if (!identity)
            return NS_OK;;
        nsCOMPtr<nsISupports> supp;
        identity->QueryInterface(*iid, getter_AddRefs(supp));
        *bp = supp;
        return NS_OK;
    }

    if (mozilla::jsipc::JavaScriptParent::IsCPOW(obj))
        return mozilla::jsipc::JavaScriptParent::InstanceOf(obj, iid, bp);

    MOZ_ASSERT(IS_WN_REFLECTOR(obj));
    XPCWrappedNative* other_wrapper = XPCWrappedNative::Get(obj);
    if (!other_wrapper)
        return NS_OK;

    // We'll trust the interface set of the wrapper if this is known
    // to be an interface that the objects *expects* to be able to
    // handle.
    if (other_wrapper->HasInterfaceNoQI(*iid)) {
        *bp = true;
        return NS_OK;
    }

    // Otherwise, we'll end up Querying the native object to be sure.
    XPCCallContext ccx(JS_CALLER, cx);

    AutoMarkingNativeInterfacePtr iface(ccx);
    iface = XPCNativeInterface::GetNewOrUsed(iid);

    nsresult findResult = NS_OK;
    if (iface && other_wrapper->FindTearOff(iface, false, &findResult))
        *bp = true;
    if (NS_FAILED(findResult) && findResult != NS_ERROR_NO_INTERFACE)
        return findResult;

    return NS_OK;
}

/* bool hasInstance (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj, in jsval val, out bool bp); */
NS_IMETHODIMP
nsJSIID::HasInstance(nsIXPConnectWrappedNative* wrapper,
                     JSContext* cx, JSObject * /* unused */,
                     HandleValue val, bool* bp, bool* _retval)
{
    *bp = false;

    if (val.isPrimitive())
        return NS_OK;

    // we have a JSObject
    RootedObject obj(cx, &val.toObject());

    const nsIID* iid;
    mInfo->GetIIDShared(&iid);
    return xpc::HasInstance(cx, obj, iid, bp);
}

/***************************************************************************/

NS_INTERFACE_MAP_BEGIN(nsJSCID)
  NS_INTERFACE_MAP_ENTRY(nsIJSID)
  NS_INTERFACE_MAP_ENTRY(nsIJSCID)
  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJSID)
  NS_IMPL_QUERY_CLASSINFO(nsJSCID)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsJSCID)
NS_IMPL_RELEASE(nsJSCID)
NS_IMPL_CI_INTERFACE_GETTER2(nsJSCID, nsIJSID, nsIJSCID)

// The nsIXPCScriptable map declaration that will generate stubs for us...
#define XPC_MAP_CLASSNAME           nsJSCID
#define XPC_MAP_QUOTED_CLASSNAME   "nsJSCID"
#define                             XPC_MAP_WANT_CONSTRUCT
#define                             XPC_MAP_WANT_HASINSTANCE
#define XPC_MAP_FLAGS               0
#include "xpc_map_end.h" /* This will #undef the above */

nsJSCID::nsJSCID()  {}
nsJSCID::~nsJSCID() {}

NS_IMETHODIMP nsJSCID::GetName(char * *aName)
    {ResolveName(); return mDetails.GetName(aName);}

NS_IMETHODIMP nsJSCID::GetNumber(char * *aNumber)
    {return mDetails.GetNumber(aNumber);}

NS_IMETHODIMP_(const nsID*) nsJSCID::GetID()
    {return &mDetails.ID();}

NS_IMETHODIMP nsJSCID::GetValid(bool* aValid)
    {return mDetails.GetValid(aValid);}

NS_IMETHODIMP nsJSCID::Equals(nsIJSID* other, bool* _retval)
    {return mDetails.Equals(other, _retval);}

NS_IMETHODIMP nsJSCID::Initialize(const char* idString)
    {return mDetails.Initialize(idString);}

NS_IMETHODIMP nsJSCID::ToString(char** _retval)
    {ResolveName(); return mDetails.ToString(_retval);}

void
nsJSCID::ResolveName()
{
    if (!mDetails.NameIsSet())
        mDetails.SetNameToNoString();
}

//static
already_AddRefed<nsJSCID>
nsJSCID::NewID(const char* str)
{
    if (!str) {
        NS_ERROR("no string");
        return nullptr;
    }

    nsRefPtr<nsJSCID> idObj = new nsJSCID();
    if (str[0] == '{') {
        NS_ENSURE_SUCCESS(idObj->Initialize(str), nullptr);
    } else {
        nsCOMPtr<nsIComponentRegistrar> registrar;
        NS_GetComponentRegistrar(getter_AddRefs(registrar));
        NS_ENSURE_TRUE(registrar, nullptr);

        nsCID* cid;
        if (NS_FAILED(registrar->ContractIDToCID(str, &cid)))
            return nullptr;
        bool success = idObj->mDetails.InitWithName(*cid, str);
        nsMemory::Free(cid);
        if (!success)
            return nullptr;
    }
    return idObj.forget();
}

static const nsID*
GetIIDArg(uint32_t argc, const JS::Value& val, JSContext* cx)
{
    const nsID* iid;

    // If an IID was passed in then use it
    if (argc) {
        JSObject* iidobj;
        if (JSVAL_IS_PRIMITIVE(val) ||
            !(iidobj = JSVAL_TO_OBJECT(val)) ||
            !(iid = xpc_JSObjectToID(cx, iidobj))) {
            return nullptr;
        }
    } else
        iid = &NS_GET_IID(nsISupports);

    return iid;
}

static void
GetWrapperObject(MutableHandleObject obj)
{
    obj.set(nullptr);
    nsXPConnect* xpc = nsXPConnect::XPConnect();
    nsAXPCNativeCallContext* ccxp = nullptr;
    xpc->GetCurrentNativeCallContext(&ccxp);
    if (!ccxp)
        return;

    nsCOMPtr<nsIXPConnectWrappedNative> wrapper;
    ccxp->GetCalleeWrapper(getter_AddRefs(wrapper));
    obj.set(wrapper->GetJSObject());
}

/* nsISupports createInstance (); */
NS_IMETHODIMP
nsJSCID::CreateInstance(HandleValue iidval, JSContext* cx,
                        uint8_t optionalArgc, MutableHandleValue retval)
{
    if (!mDetails.IsValid())
        return NS_ERROR_XPC_BAD_CID;

    RootedObject obj(cx);
    GetWrapperObject(&obj);
    if (!obj) {
        return NS_ERROR_UNEXPECTED;
    }

    nsIXPCSecurityManager* sm = nsXPConnect::XPConnect()->GetDefaultSecurityManager();
    if (sm && NS_FAILED(sm->CanCreateInstance(cx, mDetails.ID()))) {
        NS_ERROR("how are we not being called from chrome here?");
        return NS_OK;
    }

    // If an IID was passed in then use it
    const nsID* iid = GetIIDArg(optionalArgc, iidval, cx);
    if (!iid)
        return NS_ERROR_XPC_BAD_IID;

    nsCOMPtr<nsIComponentManager> compMgr;
    nsresult rv = NS_GetComponentManager(getter_AddRefs(compMgr));
    if (NS_FAILED(rv))
        return NS_ERROR_UNEXPECTED;

    nsCOMPtr<nsISupports> inst;
    rv = compMgr->CreateInstance(mDetails.ID(), nullptr, *iid, getter_AddRefs(inst));
    MOZ_ASSERT(NS_FAILED(rv) || inst, "component manager returned success, but instance is null!");

    if (NS_FAILED(rv) || !inst)
        return NS_ERROR_XPC_CI_RETURNED_FAILURE;

    rv = nsXPConnect::XPConnect()->WrapNativeToJSVal(cx, obj, inst, nullptr, iid, true, retval);
    if (NS_FAILED(rv) || retval.isPrimitive())
        return NS_ERROR_XPC_CANT_CREATE_WN;
    return NS_OK;
}

/* nsISupports getService (); */
NS_IMETHODIMP
nsJSCID::GetService(HandleValue iidval, JSContext* cx, uint8_t optionalArgc,
                    MutableHandleValue retval)
{
    if (!mDetails.IsValid())
        return NS_ERROR_XPC_BAD_CID;

    RootedObject obj(cx);
    GetWrapperObject(&obj);
    if (!obj) {
        return NS_ERROR_UNEXPECTED;
    }

    nsIXPCSecurityManager* sm;
    sm = nsXPConnect::XPConnect()->GetDefaultSecurityManager();
    if (sm && NS_FAILED(sm->CanCreateInstance(cx, mDetails.ID()))) {
        MOZ_ASSERT(JS_IsExceptionPending(cx),
                   "security manager vetoed GetService without setting exception");
        return NS_OK;
    }

    // If an IID was passed in then use it
    const nsID* iid = GetIIDArg(optionalArgc, iidval, cx);
    if (!iid)
        return NS_ERROR_XPC_BAD_IID;

    nsCOMPtr<nsIServiceManager> svcMgr;
    nsresult rv = NS_GetServiceManager(getter_AddRefs(svcMgr));
    if (NS_FAILED(rv))
        return rv;

    nsCOMPtr<nsISupports> srvc;
    rv = svcMgr->GetService(mDetails.ID(), *iid, getter_AddRefs(srvc));
    MOZ_ASSERT(NS_FAILED(rv) || srvc, "service manager returned success, but service is null!");
    if (NS_FAILED(rv) || !srvc)
        return NS_ERROR_XPC_GS_RETURNED_FAILURE;

    nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
    rv = nsXPConnect::XPConnect()->WrapNative(cx, obj, srvc, *iid, getter_AddRefs(holder));
    if (NS_FAILED(rv) || !holder || !holder->GetJSObject())
        return NS_ERROR_XPC_CANT_CREATE_WN;

    retval.setObject(*holder->GetJSObject());
    return NS_OK;
}

/* bool construct (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj, in uint32_t argc, in JSValPtr argv, in JSValPtr vp); */
NS_IMETHODIMP
nsJSCID::Construct(nsIXPConnectWrappedNative* wrapper,
                   JSContext* cx, JSObject* objArg,
                   const CallArgs& args, bool* _retval)
{
    RootedObject obj(cx, objArg);
    XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
    if (!rt)
        return NS_ERROR_FAILURE;

    // 'push' a call context and call on it
    RootedId name(cx, rt->GetStringID(XPCJSRuntime::IDX_CREATE_INSTANCE));
    XPCCallContext ccx(JS_CALLER, cx, obj, JS::NullPtr(), name, args.length(), args.array(),
                       args.rval().address());

    *_retval = XPCWrappedNative::CallMethod(ccx);
    return NS_OK;
}

/* bool hasInstance (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj, in jsval val, out bool bp); */
NS_IMETHODIMP
nsJSCID::HasInstance(nsIXPConnectWrappedNative* wrapper,
                     JSContext* cx, JSObject * /* unused */,
                     HandleValue val, bool* bp, bool* _retval)
{
    *bp = false;
    nsresult rv = NS_OK;

    if (val.isObject()) {
        // we have a JSObject
        RootedObject obj(cx, &val.toObject());

        MOZ_ASSERT(obj, "when is an object not an object?");

        // is this really a native xpcom object with a wrapper?
        nsIClassInfo* ci = nullptr;
        obj = FindObjectForHasInstance(cx, obj);
        if (!obj || !IS_WN_REFLECTOR(obj))
            return rv;
        if (XPCWrappedNative* other_wrapper = XPCWrappedNative::Get(obj))
            ci = other_wrapper->GetClassInfo();

        // We consider CID equality to be the thing that matters here.
        // This is perhaps debatable.
        if (ci) {
            nsID cid;
            if (NS_SUCCEEDED(ci->GetClassIDNoAlloc(&cid)))
                *bp = cid.Equals(mDetails.ID());
        }
    }

    return rv;
}

/***************************************************************************/
// additional utilities...

JSObject*
xpc_NewIDObject(JSContext* cx, HandleObject jsobj, const nsID& aID)
{
    RootedObject obj(cx);

    nsCOMPtr<nsIJSID> iid = nsJSID::NewID(aID);
    if (iid) {
        nsXPConnect* xpc = nsXPConnect::XPConnect();
        if (xpc) {
            nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
            nsresult rv = xpc->WrapNative(cx, jsobj,
                                          static_cast<nsISupports*>(iid),
                                          NS_GET_IID(nsIJSID),
                                          getter_AddRefs(holder));
            if (NS_SUCCEEDED(rv) && holder) {
                obj = holder->GetJSObject();
            }
        }
    }
    return obj;
}

// note: returned pointer is only valid while |obj| remains alive!
const nsID*
xpc_JSObjectToID(JSContext* cx, JSObject* obj)
{
    if (!cx || !obj)
        return nullptr;

    // NOTE: this call does NOT addref
    XPCWrappedNative* wrapper = nullptr;
    obj = js::CheckedUnwrap(obj);
    if (obj && IS_WN_REFLECTOR(obj))
        wrapper = XPCWrappedNative::Get(obj);
    if (wrapper &&
        (wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID))  ||
         wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
         wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)))) {
        return ((nsIJSID*)wrapper->GetIdentityObject())->GetID();
    }
    return nullptr;
}

bool
xpc_JSObjectIsID(JSContext* cx, JSObject* obj)
{
    MOZ_ASSERT(cx && obj, "bad param");
    // NOTE: this call does NOT addref
    XPCWrappedNative* wrapper = nullptr;
    obj = js::CheckedUnwrap(obj);
    if (obj && IS_WN_REFLECTOR(obj))
        wrapper = XPCWrappedNative::Get(obj);
    return wrapper &&
           (wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID))  ||
            wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
            wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)));
}