| File: | var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp |
| Warning: | line 182, column 12 Value stored to 'rv' during its initialization is never read |
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| 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| 2 | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| 6 | |
| 7 | #include "nsString.h" |
| 8 | |
| 9 | #include "nsIController.h" |
| 10 | #include "nsIControllers.h" |
| 11 | #include "nsIObserver.h" |
| 12 | |
| 13 | #include "nsServiceManagerUtils.h" |
| 14 | |
| 15 | #include "nsContentUtils.h" |
| 16 | #include "nsPIDOMWindow.h" |
| 17 | #include "nsPIWindowRoot.h" |
| 18 | |
| 19 | #include "nsCOMArray.h" |
| 20 | |
| 21 | #include "nsCommandManager.h" |
| 22 | |
| 23 | nsCommandManager::nsCommandManager(mozIDOMWindowProxy* aWindow) |
| 24 | : mWindow(aWindow) { |
| 25 | MOZ_DIAGNOSTIC_ASSERT(mWindow)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mWindow)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mWindow))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mWindow", "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 25); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "mWindow" ")"); do { *((volatile int*)__null) = 25; __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 26 | } |
| 27 | |
| 28 | nsCommandManager::~nsCommandManager() = default; |
| 29 | |
| 30 | NS_IMPL_CYCLE_COLLECTION_CLASS(nsCommandManager)nsCommandManager::cycleCollection nsCommandManager::_cycleCollectorGlobal ; |
| 31 | |
| 32 | NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsCommandManager)void nsCommandManager::cycleCollection::Unlink(void* p) { nsCommandManager * tmp = DowncastCCParticipant<nsCommandManager>(p); |
| 33 | tmp->mObserversTable.Clear(); |
| 34 | NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCEtmp->ClearWeakReferences(); |
| 35 | NS_IMPL_CYCLE_COLLECTION_UNLINK_END(void)tmp; } |
| 36 | NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsCommandManager)nsresult nsCommandManager::cycleCollection::TraverseNative( void * p, nsCycleCollectionTraversalCallback& cb) { nsCommandManager * tmp = DowncastCCParticipant<nsCommandManager>(p); cb. DescribeRefCountedNode(tmp->mRefCnt.get(), "nsCommandManager" ); |
| 37 | for (const auto& entry : tmp->mObserversTable) { |
| 38 | nsCommandManager::ObserverList* observers = entry.GetWeak(); |
| 39 | int32_t numItems = observers->Length(); |
| 40 | for (int32_t i = 0; i < numItems; ++i) { |
| 41 | cb.NoteXPCOMChild(observers->ElementAt(i)); |
| 42 | } |
| 43 | } |
| 44 | NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END(void)tmp; return NS_OK; } |
| 45 | |
| 46 | NS_IMPL_CYCLE_COLLECTING_ADDREF(nsCommandManager)MozExternalRefCountType nsCommandManager::AddRef(void) { static_assert (!std::is_destructible_v<nsCommandManager>, "Reference-counted class " "nsCommandManager" " should not have a public destructor. " "Make this class's destructor non-public" ); do { static_assert( mozilla::detail::AssertionConditionType <decltype(int32_t(mRefCnt) >= 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(int32_t(mRefCnt) >= 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("int32_t(mRefCnt) >= 0" " (" "illegal refcnt" ")", "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 46); AnnotateMozCrashReason("MOZ_ASSERT" "(" "int32_t(mRefCnt) >= 0" ") (" "illegal refcnt" ")"); do { *((volatile int*)__null) = 46; __attribute__((nomerge)) ::abort(); } while (false); } } while (false); _mOwningThread.AssertOwnership("nsCommandManager" " not thread-safe"); nsISupports* base = nsCommandManager::cycleCollection ::Upcast(this); nsrefcnt count = mRefCnt.incr(base); NS_LogAddRef ((this), (count), ("nsCommandManager"), (uint32_t)(sizeof(*this ))); return count; } |
| 47 | NS_IMPL_CYCLE_COLLECTING_RELEASE(nsCommandManager)MozExternalRefCountType nsCommandManager::Release(void) { do { static_assert( mozilla::detail::AssertionConditionType<decltype (int32_t(mRefCnt) > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(int32_t(mRefCnt) > 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("int32_t(mRefCnt) > 0" " (" "dup release" ")", "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 47); AnnotateMozCrashReason("MOZ_ASSERT" "(" "int32_t(mRefCnt) > 0" ") (" "dup release" ")"); do { *((volatile int*)__null) = 47 ; __attribute__((nomerge)) ::abort(); } while (false); } } while (false); _mOwningThread.AssertOwnership("nsCommandManager" " not thread-safe" ); nsISupports* base = nsCommandManager::cycleCollection::Upcast (this); nsrefcnt count = mRefCnt.decr(base); NS_LogRelease((this ), (count), ("nsCommandManager")); return count; } void nsCommandManager ::DeleteCycleCollectable(void) { delete (this); } |
| 48 | |
| 49 | NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsCommandManager)nsresult nsCommandManager::QueryInterface(const nsIID& aIID , void** aInstancePtr) { do { if (!(aInstancePtr)) { NS_DebugBreak (NS_DEBUG_ASSERTION, "QueryInterface requires a non-NULL destination!" , "aInstancePtr", "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 49); MOZ_PretendNoReturn(); } } while (0); nsISupports* foundInterface ; if (TopThreeWordsEquals( aIID, (nsXPCOMCycleCollectionParticipant ::COMTypeInfo<nsXPCOMCycleCollectionParticipant, void>:: kIID), (nsCycleCollectionISupports::COMTypeInfo<nsCycleCollectionISupports , void>::kIID)) && (LowWordEquals(aIID, (nsXPCOMCycleCollectionParticipant ::COMTypeInfo<nsXPCOMCycleCollectionParticipant, void>:: kIID)) || LowWordEquals(aIID, (nsCycleCollectionISupports::COMTypeInfo <nsCycleCollectionISupports, void>::kIID)))) { if (LowWordEquals (aIID, (nsXPCOMCycleCollectionParticipant::COMTypeInfo<nsXPCOMCycleCollectionParticipant , void>::kIID))) { *aInstancePtr = nsCommandManager::cycleCollection ::GetParticipant(); return NS_OK; } if (LowWordEquals(aIID, ( nsCycleCollectionISupports::COMTypeInfo<nsCycleCollectionISupports , void>::kIID))) { *aInstancePtr = nsCommandManager::cycleCollection ::Upcast(this); return NS_OK; } foundInterface = nullptr; } else |
| 50 | NS_INTERFACE_MAP_ENTRY(nsICommandManager)if (aIID.Equals(mozilla::detail::kImplementedIID<std::remove_reference_t <decltype(*this)>, nsICommandManager>)) foundInterface = static_cast<nsICommandManager*>(this); else |
| 51 | NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)if (aIID.Equals(mozilla::detail::kImplementedIID<std::remove_reference_t <decltype(*this)>, nsISupportsWeakReference>)) foundInterface = static_cast<nsISupportsWeakReference*>(this); else |
| 52 | NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsICommandManager)if (aIID.Equals(mozilla::detail::kImplementedIID<std::remove_reference_t <decltype(*this)>, nsISupports>)) foundInterface = static_cast <nsISupports*>(static_cast<nsICommandManager*>(this )); else |
| 53 | NS_INTERFACE_MAP_ENDfoundInterface = 0; nsresult status; if (!foundInterface) { do { static_assert( mozilla::detail::AssertionConditionType< decltype(!aIID.Equals((nsISupports::COMTypeInfo<nsISupports , void>::kIID)))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!aIID.Equals((nsISupports::COMTypeInfo <nsISupports, void>::kIID))))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("!aIID.Equals((nsISupports::COMTypeInfo<nsISupports, void>::kIID))" , "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 53); AnnotateMozCrashReason("MOZ_ASSERT" "(" "!aIID.Equals((nsISupports::COMTypeInfo<nsISupports, void>::kIID))" ")"); do { *((volatile int*)__null) = 53; __attribute__((nomerge )) ::abort(); } while (false); } } while (false); status = NS_NOINTERFACE ; } else { (foundInterface)->AddRef(); status = NS_OK; } * aInstancePtr = foundInterface; return status; } |
| 54 | |
| 55 | void nsCommandManager::CommandStatusChanged(const char* aCommandName) { |
| 56 | ObserverList* commandObservers; |
| 57 | mObserversTable.Get(aCommandName, &commandObservers); |
| 58 | |
| 59 | if (commandObservers) { |
| 60 | // XXX Should we worry about observers removing themselves from Observe()? |
| 61 | int32_t i, numItems = commandObservers->Length(); |
| 62 | for (i = 0; i < numItems; ++i) { |
| 63 | nsCOMPtr<nsIObserver> observer = commandObservers->ElementAt(i); |
| 64 | // should we get the command state to pass here? This might be expensive. |
| 65 | observer->Observe(NS_ISUPPORTS_CAST(nsICommandManager*, this)static_cast<nsISupports*>(static_cast<nsICommandManager *>(this)), |
| 66 | aCommandName, u"command_status_changed"); |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | #if 0 |
| 72 | # pragma mark - |
| 73 | #endif |
| 74 | |
| 75 | NS_IMETHODIMPnsresult |
| 76 | nsCommandManager::AddCommandObserver(nsIObserver* aCommandObserver, |
| 77 | const char* aCommandToObserve) { |
| 78 | NS_ENSURE_ARG(aCommandObserver)do { if ((__builtin_expect(!!(!(aCommandObserver)), 0))) { NS_DebugBreak (NS_DEBUG_WARNING, "NS_ENSURE_TRUE(" "aCommandObserver" ") failed" , nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 78); return NS_ERROR_INVALID_ARG; } } while (false); |
| 79 | |
| 80 | // XXX todo: handle special cases of aCommandToObserve being null, or empty |
| 81 | |
| 82 | // for each command in the table, we make a list of observers for that command |
| 83 | auto* const commandObservers = |
| 84 | mObserversTable.GetOrInsertNew(aCommandToObserve); |
| 85 | |
| 86 | // need to check that this command observer hasn't already been registered |
| 87 | int32_t existingIndex = commandObservers->IndexOf(aCommandObserver); |
| 88 | if (existingIndex == -1) { |
| 89 | commandObservers->AppendElement(aCommandObserver); |
| 90 | } else { |
| 91 | NS_WARNING("Registering command observer twice on the same command")NS_DebugBreak(NS_DEBUG_WARNING, "Registering command observer twice on the same command" , nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 91); |
| 92 | } |
| 93 | |
| 94 | return NS_OK; |
| 95 | } |
| 96 | |
| 97 | NS_IMETHODIMPnsresult |
| 98 | nsCommandManager::RemoveCommandObserver(nsIObserver* aCommandObserver, |
| 99 | const char* aCommandObserved) { |
| 100 | NS_ENSURE_ARG(aCommandObserver)do { if ((__builtin_expect(!!(!(aCommandObserver)), 0))) { NS_DebugBreak (NS_DEBUG_WARNING, "NS_ENSURE_TRUE(" "aCommandObserver" ") failed" , nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 100); return NS_ERROR_INVALID_ARG; } } while (false); |
| 101 | |
| 102 | // XXX todo: handle special cases of aCommandToObserve being null, or empty |
| 103 | |
| 104 | ObserverList* commandObservers; |
| 105 | if (!mObserversTable.Get(aCommandObserved, &commandObservers)) { |
| 106 | return NS_ERROR_UNEXPECTED; |
| 107 | } |
| 108 | |
| 109 | commandObservers->RemoveElement(aCommandObserver); |
| 110 | |
| 111 | return NS_OK; |
| 112 | } |
| 113 | |
| 114 | NS_IMETHODIMPnsresult |
| 115 | nsCommandManager::IsCommandSupported(const char* aCommandName, |
| 116 | mozIDOMWindowProxy* aTargetWindow, |
| 117 | bool* aResult) { |
| 118 | NS_ENSURE_ARG_POINTER(aResult)do { if ((__builtin_expect(!!(!(aResult)), 0))) { NS_DebugBreak (NS_DEBUG_WARNING, "NS_ENSURE_TRUE(" "aResult" ") failed", nullptr , "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 118); return NS_ERROR_INVALID_POINTER; } } while (false); |
| 119 | |
| 120 | nsCOMPtr<nsIController> controller; |
| 121 | GetControllerForCommand(aCommandName, aTargetWindow, |
| 122 | getter_AddRefs(controller)); |
| 123 | *aResult = (controller.get() != nullptr); |
| 124 | return NS_OK; |
| 125 | } |
| 126 | |
| 127 | NS_IMETHODIMPnsresult |
| 128 | nsCommandManager::IsCommandEnabled(const char* aCommandName, |
| 129 | mozIDOMWindowProxy* aTargetWindow, |
| 130 | bool* aResult) { |
| 131 | NS_ENSURE_ARG_POINTER(aResult)do { if ((__builtin_expect(!!(!(aResult)), 0))) { NS_DebugBreak (NS_DEBUG_WARNING, "NS_ENSURE_TRUE(" "aResult" ") failed", nullptr , "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 131); return NS_ERROR_INVALID_POINTER; } } while (false); |
| 132 | if (!aCommandName) { |
| 133 | *aResult = false; |
| 134 | return NS_OK; |
| 135 | } |
| 136 | *aResult = IsCommandEnabled(nsDependentCString(aCommandName), aTargetWindow); |
| 137 | return NS_OK; |
| 138 | } |
| 139 | |
| 140 | bool nsCommandManager::IsCommandEnabled(const nsCString& aCommandName, |
| 141 | mozIDOMWindowProxy* aTargetWindow) { |
| 142 | nsCOMPtr<nsIController> controller; |
| 143 | GetControllerForCommand(aCommandName.get(), aTargetWindow, |
| 144 | getter_AddRefs(controller)); |
| 145 | if (!controller) { |
| 146 | return false; |
| 147 | } |
| 148 | |
| 149 | bool enabled = false; |
| 150 | controller->IsCommandEnabled(aCommandName.get(), &enabled); |
| 151 | return enabled; |
| 152 | } |
| 153 | |
| 154 | NS_IMETHODIMPnsresult |
| 155 | nsCommandManager::GetCommandState(const char* aCommandName, |
| 156 | mozIDOMWindowProxy* aTargetWindow, |
| 157 | nsICommandParams* aCommandParams) { |
| 158 | nsCOMPtr<nsIController> controller; |
| 159 | nsAutoString tValue; |
| 160 | nsresult rv = GetControllerForCommand(aCommandName, aTargetWindow, |
| 161 | getter_AddRefs(controller)); |
| 162 | if (!controller) { |
| 163 | return NS_ERROR_FAILURE; |
| 164 | } |
| 165 | |
| 166 | nsCOMPtr<nsICommandController> commandController = |
| 167 | do_QueryInterface(controller); |
| 168 | if (commandController) { |
| 169 | rv = commandController->GetCommandStateWithParams(aCommandName, |
| 170 | aCommandParams); |
| 171 | } else { |
| 172 | rv = NS_ERROR_NOT_IMPLEMENTED; |
| 173 | } |
| 174 | return rv; |
| 175 | } |
| 176 | |
| 177 | NS_IMETHODIMPnsresult |
| 178 | nsCommandManager::DoCommand(const char* aCommandName, |
| 179 | nsICommandParams* aCommandParams, |
| 180 | mozIDOMWindowProxy* aTargetWindow) { |
| 181 | nsCOMPtr<nsIController> controller; |
| 182 | nsresult rv = GetControllerForCommand(aCommandName, aTargetWindow, |
Value stored to 'rv' during its initialization is never read | |
| 183 | getter_AddRefs(controller)); |
| 184 | if (!controller) { |
| 185 | return NS_ERROR_FAILURE; |
| 186 | } |
| 187 | |
| 188 | nsCOMPtr<nsICommandController> commandController = |
| 189 | do_QueryInterface(controller); |
| 190 | if (commandController && aCommandParams) { |
| 191 | rv = commandController->DoCommandWithParams(aCommandName, aCommandParams); |
| 192 | } else { |
| 193 | rv = controller->DoCommand(aCommandName); |
| 194 | } |
| 195 | return rv; |
| 196 | } |
| 197 | |
| 198 | nsresult nsCommandManager::GetControllerForCommand( |
| 199 | const char* aCommand, mozIDOMWindowProxy* aTargetWindow, |
| 200 | nsIController** aResult) { |
| 201 | nsresult rv = NS_ERROR_FAILURE; |
| 202 | *aResult = nullptr; |
| 203 | |
| 204 | // check if we're in content or chrome |
| 205 | // if we're not chrome we must have a target window or we bail |
| 206 | if (!nsContentUtils::LegacyIsCallerChromeOrNativeCode()) { |
| 207 | if (!aTargetWindow) { |
| 208 | return rv; |
| 209 | } |
| 210 | |
| 211 | // if a target window is specified, it must be the window we expect |
| 212 | if (aTargetWindow != mWindow) { |
| 213 | return NS_ERROR_FAILURE; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | if (auto* targetWindow = nsPIDOMWindowOuter::From(aTargetWindow)) { |
| 218 | // get the controller for this particular window |
| 219 | nsCOMPtr<nsIControllers> controllers; |
| 220 | rv = targetWindow->GetControllers(getter_AddRefs(controllers)); |
| 221 | if (NS_FAILED(rv)((bool)(__builtin_expect(!!(NS_FAILED_impl(rv)), 0)))) { |
| 222 | return rv; |
| 223 | } |
| 224 | if (!controllers) { |
| 225 | return NS_ERROR_FAILURE; |
| 226 | } |
| 227 | |
| 228 | // dispatch the command |
| 229 | return controllers->GetControllerForCommand(aCommand, aResult); |
| 230 | } |
| 231 | |
| 232 | auto* window = nsPIDOMWindowOuter::From(mWindow); |
| 233 | NS_ENSURE_TRUE(window, NS_ERROR_FAILURE)do { if ((__builtin_expect(!!(!(window)), 0))) { NS_DebugBreak (NS_DEBUG_WARNING, "NS_ENSURE_TRUE(" "window" ") failed", nullptr , "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 233); return NS_ERROR_FAILURE; } } while (false); |
| 234 | nsCOMPtr<nsPIWindowRoot> root = window->GetTopWindowRoot(); |
| 235 | NS_ENSURE_TRUE(root, NS_ERROR_FAILURE)do { if ((__builtin_expect(!!(!(root)), 0))) { NS_DebugBreak( NS_DEBUG_WARNING, "NS_ENSURE_TRUE(" "root" ") failed", nullptr , "/var/lib/jenkins/workspace/firefox-scan-build/dom/commandhandler/nsCommandManager.cpp" , 235); return NS_ERROR_FAILURE; } } while (false); |
| 236 | |
| 237 | // no target window; send command to focus controller |
| 238 | return root->GetControllerForCommand(aCommand, false /* for any window */, |
| 239 | aResult); |
| 240 | } |