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Diffstat (limited to 'js/xpconnect/src/XPCJSID.cpp')
| -rw-r--r-- | js/xpconnect/src/XPCJSID.cpp | 816 |
1 files changed, 816 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCJSID.cpp b/js/xpconnect/src/XPCJSID.cpp new file mode 100644 index 000000000..b9cbee7be --- /dev/null +++ b/js/xpconnect/src/XPCJSID.cpp @@ -0,0 +1,816 @@ +/* -*- 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 "xpc_make_class.h" +#include "mozilla/dom/BindingUtils.h" +#include "mozilla/Attributes.h" +#include "mozilla/jsipc/CrossProcessObjectWrappers.h" +#include "mozilla/StaticPtr.h" + +using namespace mozilla::dom; +using namespace JS; + +/***************************************************************************/ +// nsJSID + +NS_IMPL_CLASSINFO(nsJSID, nullptr, 0, NS_JS_ID_CID) +NS_IMPL_ISUPPORTS_CI(nsJSID, nsIJSID) + +const char nsJSID::gNoString[] = ""; + +nsJSID::nsJSID() + : mID(GetInvalidIID()), + mNumber(const_cast<char*>(gNoString)), + mName(const_cast<char*>(gNoString)) +{ +} + +nsJSID::~nsJSID() +{ + if (mNumber && mNumber != gNoString) + free(mNumber); + if (mName && mName != gNoString) + free(mName); +} + +void nsJSID::Reset() +{ + mID = GetInvalidIID(); + + if (mNumber && mNumber != gNoString) + free(mNumber); + if (mName && mName != gNoString) + 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 = const_cast<char*>(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; + } + + RefPtr<nsJSID> idObj = new nsJSID(); + NS_ENSURE_SUCCESS(idObj->Initialize(str), nullptr); + return idObj.forget(); +} + +//static +already_AddRefed<nsJSID> +nsJSID::NewID(const nsID& id) +{ + RefPtr<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 final : public nsIXPCScriptable +{ + ~SharedScriptableHelperForJSIID() {} +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::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; + } +} + +static nsresult GetSharedScriptableHelperForJSIID(nsIXPCScriptable** helper) +{ + EnsureClassObjectsInitialized(); + nsCOMPtr<nsIXPCScriptable> temp = gSharedScriptableHelperForJSIID.get(); + temp.forget(helper); + 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_GETTER(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_RESOLVE +#define XPC_MAP_WANT_ENUMERATE +#define XPC_MAP_WANT_HASINSTANCE +#define XPC_MAP_FLAGS 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; + + RefPtr<nsJSIID> idObj = new nsJSIID(aInfo); + return idObj.forget(); +} + + +NS_IMETHODIMP +nsJSIID::Resolve(nsIXPConnectWrappedNative* wrapper, + JSContext * cx, JSObject * objArg, + jsid idArg, bool* resolvedp, + bool* _retval) +{ + RootedObject obj(cx, objArg); + RootedId id(cx, idArg); + XPCCallContext ccx(cx); + + RefPtr<XPCNativeInterface> iface = + XPCNativeInterface::GetNewOrUsed(mInfo); + + 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; + + *resolvedp = true; + *_retval = JS_DefinePropertyById(cx, obj, id, val, + JSPROP_ENUMERATE | JSPROP_READONLY | + JSPROP_PERMANENT | JSPROP_RESOLVING); + } + + return NS_OK; +} + +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(cx); + + RefPtr<XPCNativeInterface> iface = + XPCNativeInterface::GetNewOrUsed(mInfo); + + 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 nsresult +FindObjectForHasInstance(JSContext* cx, HandleObject objArg, MutableHandleObject target) +{ + RootedObject obj(cx, objArg), proto(cx); + + while (obj && !IS_WN_REFLECTOR(obj) && + !IsDOMObject(obj) && !mozilla::jsipc::IsCPOW(obj)) + { + if (js::IsWrapper(obj)) { + obj = js::CheckedUnwrap(obj, /* stopAtWindowProxy = */ false); + continue; + } + + { + JSAutoCompartment ac(cx, obj); + if (!js::GetObjectProto(cx, obj, &proto)) + return NS_ERROR_FAILURE; + } + + obj = proto; + } + + target.set(obj); + return NS_OK; +} + +nsresult +xpc::HasInstance(JSContext* cx, HandleObject objArg, const nsID* iid, bool* bp) +{ + *bp = false; + + RootedObject obj(cx); + nsresult rv = FindObjectForHasInstance(cx, objArg, &obj); + if (NS_WARN_IF(NS_FAILED(rv))) + return rv; + + if (!obj) + return NS_OK; + + if (mozilla::jsipc::IsCPOW(obj)) + return mozilla::jsipc::InstanceOf(obj, iid, bp); + + nsCOMPtr<nsISupports> identity = UnwrapReflectorToISupports(obj); + if (!identity) + return NS_OK; + + nsCOMPtr<nsISupports> supp; + identity->QueryInterface(*iid, getter_AddRefs(supp)); + *bp = supp; + + // Our old HasInstance implementation operated by invoking FindTearOff on + // XPCWrappedNatives, and various bits of chrome JS came to depend on + // |instanceof| doing an implicit QI if it succeeds. Do a drive-by QI to + // preserve that behavior. This is just a compatibility hack, so we don't + // really care if it fails. + if (IS_WN_REFLECTOR(obj)) + (void) XPCWrappedNative::Get(obj)->FindTearOff(*iid); + + return NS_OK; +} + +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_GETTER(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() { mDetails = new nsJSID(); } +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; + } + + RefPtr<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); + 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 (val.isPrimitive() || + !(iidobj = val.toObjectOrNull()) || + !(iid = xpc_JSObjectToID(cx, iidobj))) { + return nullptr; + } + } else + iid = &NS_GET_IID(nsISupports); + + return iid; +} + +NS_IMETHODIMP +nsJSCID::CreateInstance(HandleValue iidval, JSContext* cx, + uint8_t optionalArgc, MutableHandleValue retval) +{ + if (!mDetails->IsValid()) + return NS_ERROR_XPC_BAD_CID; + + if (NS_FAILED(nsXPConnect::SecurityManager()->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 = nsContentUtils::WrapNative(cx, inst, iid, retval); + if (NS_FAILED(rv) || retval.isPrimitive()) + return NS_ERROR_XPC_CANT_CREATE_WN; + return NS_OK; +} + +NS_IMETHODIMP +nsJSCID::GetService(HandleValue iidval, JSContext* cx, uint8_t optionalArgc, + MutableHandleValue retval) +{ + if (!mDetails->IsValid()) + return NS_ERROR_XPC_BAD_CID; + + if (NS_FAILED(nsXPConnect::SecurityManager()->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; + + RootedValue v(cx); + rv = nsContentUtils::WrapNative(cx, srvc, iid, &v); + if (NS_FAILED(rv) || !v.isObject()) + return NS_ERROR_XPC_CANT_CREATE_WN; + + retval.set(v); + return NS_OK; +} + +NS_IMETHODIMP +nsJSCID::Construct(nsIXPConnectWrappedNative* wrapper, + JSContext* cx, JSObject* objArg, + const CallArgs& args, bool* _retval) +{ + RootedObject obj(cx, objArg); + XPCJSContext* xpccx = nsXPConnect::GetContextInstance(); + if (!xpccx) + return NS_ERROR_FAILURE; + + // 'push' a call context and call on it + RootedId name(cx, xpccx->GetStringID(XPCJSContext::IDX_CREATE_INSTANCE)); + XPCCallContext ccx(cx, obj, nullptr, name, args.length(), args.array(), + args.rval().address()); + + *_retval = XPCWrappedNative::CallMethod(ccx); + return NS_OK; +} + +NS_IMETHODIMP +nsJSCID::HasInstance(nsIXPConnectWrappedNative* wrapper, + JSContext* cx, JSObject * /* unused */, + HandleValue val, bool* bp, bool* _retval) +{ + *bp = false; + + if (!val.isObject()) + return NS_OK; + + RootedObject obj(cx, &val.toObject()); + + // is this really a native xpcom object with a wrapper? + RootedObject target(cx); + nsresult rv = FindObjectForHasInstance(cx, obj, &target); + if (NS_WARN_IF(NS_FAILED(rv))) + return rv; + + if (!target || !IS_WN_REFLECTOR(target)) + return NS_OK; + + if (XPCWrappedNative* other_wrapper = XPCWrappedNative::Get(target)) { + if (nsIClassInfo* ci = other_wrapper->GetClassInfo()) { + // We consider CID equality to be the thing that matters here. + // This is perhaps debatable. + nsID cid; + if (NS_SUCCEEDED(ci->GetClassIDNoAlloc(&cid))) + *bp = cid.Equals(mDetails->ID()); + } + } + + return NS_OK; +} + +/***************************************************************************/ +// 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) { + xpc->WrapNative(cx, jsobj, static_cast<nsISupports*>(iid), + NS_GET_IID(nsIJSID), obj.address()); + } + } + 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))); +} + + |