PassOwnPtrWillBeRawPtr<WillBeHeapVector<RefPtrWillBeMember<StyleRuleKeyframe> > > BisonCSSParser::sinkFloatingKeyframeVector(WillBeHeapVector<RefPtrWillBeMember<StyleRuleKeyframe> >* keyframeVector)
{
    ASSERT_UNUSED(keyframeVector, m_floatingKeyframeVector == keyframeVector);
    return m_floatingKeyframeVector.release();
}

bool JSNotAnObject::getOwnPropertySlot(TiExcState* exec, unsigned, PropertySlot&)
{
    ASSERT_UNUSED(exec, exec->hadException() && exec->exception() == m_exception);
    return false;
}

void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)
{ 
    int result = munmap(alloc.pages, alloc.size);
    ASSERT_UNUSED(result, !result);
}

bool RenderSVGResourceMasker::applyResource(RenderElement& renderer, const RenderStyle&, GraphicsContext*& context, unsigned short resourceMode)
{
    ASSERT_UNUSED(resourceMode, resourceMode == ApplyToDefaultMode);
    return applySVGMask(renderer, context, true);
}

void DocumentLoader::redirectReceived(CachedResource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    ASSERT_UNUSED(resource, resource == m_mainResource);
    willSendRequest(request, redirectResponse);
}

void TreeScopeAdopter::ensureDidMoveToNewDocumentWasCalled(Document& oldDocument)
{
    ASSERT(!didMoveToNewDocumentWasCalled);
    ASSERT_UNUSED(oldDocument, oldDocument == oldDocumentDidMoveToNewDocumentWasCalledWith);
    didMoveToNewDocumentWasCalled = true;
}

//.........这里部分代码省略.........
                yOrientationShift -= scaledGlyphAdvance / 2;
            } else {
                // If there's an absolute x position available, it marks the beginning of a new position along the path.
                if (x != SVGTextLayoutAttributes::emptyValue())
                    m_textPathCurrentOffset = x + m_textPathStartOffset;

                m_textPathCurrentOffset += m_dx - kerning;
                m_dx = 0;

                // Apply dx/dy correction and setup translations that move to the glyph midpoint.
                xOrientationShift -= scaledGlyphAdvance / 2;
                yOrientationShift += m_dy - baselineShift;
            }

            // Calculate current offset along path.
            textPathOffset = m_textPathCurrentOffset + scaledGlyphAdvance / 2;

            // Move to next character.
            m_textPathCurrentOffset += scaledGlyphAdvance + m_textPathSpacing + spacing * m_textPathScaling;

            // Skip character, if we're before the path.
            if (textPathOffset < 0) {
                advanceToNextLogicalCharacter(logicalMetrics);
                advanceToNextVisualCharacter(visualMetrics);
                continue;
            }

            // Stop processing, if the next character lies behind the path.
            if (textPathOffset > m_textPathLength)
                break;

            FloatPoint point;
            bool ok = m_textPathCalculator->pointAndNormalAtLength(textPathOffset, point, angle);
            ASSERT_UNUSED(ok, ok);
            x = point.x();
            y = point.y();

            // For vertical text on path, the actual angle has to be rotated 90 degrees anti-clockwise, not the orientation angle!
            if (m_isVerticalText)
                angle -= 90;
        } else {
            // Apply all previously calculated shift values.
            if (m_isVerticalText) {
                x += baselineShift;
                y -= kerning;
            } else {
                x -= kerning;
                y -= baselineShift;
            }

            x += m_dx;
            y += m_dy;
        }

        // Determine whether we have to start a new fragment.
        bool shouldStartNewFragment = m_dx || m_dy || m_isVerticalText || m_inPathLayout || angle || angle != lastAngle
                                      || orientationAngle || kerning || applySpacingToNextCharacter || definesTextLength;

        // If we already started a fragment, close it now.
        if (didStartTextFragment && shouldStartNewFragment) {
            applySpacingToNextCharacter = false;
            recordTextFragment(textBox, visualMetricsValues);
        }

        // Eventually start a new fragment, if not yet done.
        if (!didStartTextFragment || shouldStartNewFragment) {

void PluginStream::delayDeliveryTimerFired(Timer<PluginStream>* timer)
{
    ASSERT_UNUSED(timer, timer == &m_delayDeliveryTimer);

    deliverData();
}

void Heap::popTempSortVector(Vector<ValueStringPair>* tempVector)
{
    ASSERT_UNUSED(tempVector, tempVector == m_tempSortingVectors.last());
    m_tempSortingVectors.removeLast();
}

void LinkLoader::linkLoadingErrorTimerFired(Timer<LinkLoader>* timer)
{
    ASSERT_UNUSED(timer, timer == &m_linkLoadingErrorTimer);
    m_client->linkLoadingErrored();
}

GetByIdStatus GetByIdStatus::computeForStubInfoWithoutExitSiteFeedback(
    const ConcurrentJITLocker& locker, CodeBlock* profiledBlock, StructureStubInfo* stubInfo, UniquedStringImpl* uid,
    CallLinkStatus::ExitSiteData callExitSiteData)
{
    if (!stubInfo)
        return GetByIdStatus(NoInformation);
    
    if (!stubInfo->seen)
        return GetByIdStatus(NoInformation);
    
    PolymorphicAccess* list = 0;
    State slowPathState = TakesSlowPath;
    if (stubInfo->cacheType == CacheType::Stub) {
        list = stubInfo->u.stub;
        for (unsigned i = 0; i < list->size(); ++i) {
            const AccessCase& access = list->at(i);
            if (access.doesCalls())
                slowPathState = MakesCalls;
        }
    }
    
    if (stubInfo->tookSlowPath)
        return GetByIdStatus(slowPathState);
    
    // Finally figure out if we can derive an access strategy.
    GetByIdStatus result;
    result.m_state = Simple;
    result.m_wasSeenInJIT = true; // This is interesting for bytecode dumping only.
    switch (stubInfo->cacheType) {
    case CacheType::Unset:
        return GetByIdStatus(NoInformation);
        
    case CacheType::GetByIdSelf: {
        Structure* structure = stubInfo->u.byIdSelf.baseObjectStructure.get();
        if (structure->takesSlowPathInDFGForImpureProperty())
            return GetByIdStatus(slowPathState, true);
        unsigned attributesIgnored;
        GetByIdVariant variant;
        variant.m_offset = structure->getConcurrently(uid, attributesIgnored);
        if (!isValidOffset(variant.m_offset))
            return GetByIdStatus(slowPathState, true);
        
        variant.m_structureSet.add(structure);
        bool didAppend = result.appendVariant(variant);
        ASSERT_UNUSED(didAppend, didAppend);
        return result;
    }
        
    case CacheType::Stub: {
        for (unsigned listIndex = 0; listIndex < list->size(); ++listIndex) {
            const AccessCase& access = list->at(listIndex);
            if (access.viaProxy())
                return GetByIdStatus(slowPathState, true);
            
            Structure* structure = access.structure();
            if (!structure) {
                // The null structure cases arise due to array.length and string.length. We have no way
                // of creating a GetByIdVariant for those, and we don't really have to since the DFG
                // handles those cases in FixupPhase using value profiling. That's a bit awkward - we
                // shouldn't have to use value profiling to discover something that the AccessCase
                // could have told us. But, it works well enough. So, our only concern here is to not
                // crash on null structure.
                return GetByIdStatus(slowPathState, true);
            }
            
            ComplexGetStatus complexGetStatus = ComplexGetStatus::computeFor(
                structure, access.conditionSet(), uid);
             
            switch (complexGetStatus.kind()) {
            case ComplexGetStatus::ShouldSkip:
                continue;
                 
            case ComplexGetStatus::TakesSlowPath:
                return GetByIdStatus(slowPathState, true);
                 
            case ComplexGetStatus::Inlineable: {
                std::unique_ptr<CallLinkStatus> callLinkStatus;
                switch (access.type()) {
                case AccessCase::Load: {
                    break;
                }
                case AccessCase::Getter: {
                    CallLinkInfo* callLinkInfo = access.callLinkInfo();
                    ASSERT(callLinkInfo);
                    callLinkStatus = std::make_unique<CallLinkStatus>(
                        CallLinkStatus::computeFor(
                            locker, profiledBlock, *callLinkInfo, callExitSiteData));
                    break;
                }
                default: {
                    // FIXME: It would be totally sweet to support more of these at some point in the
                    // future. https://bugs.webkit.org/show_bug.cgi?id=133052
                    return GetByIdStatus(slowPathState, true);
                } }
                 
                GetByIdVariant variant(
                    StructureSet(structure), complexGetStatus.offset(),
                    complexGetStatus.conditionSet(), WTF::move(callLinkStatus));
                 
                if (!result.appendVariant(variant))
//.........这里部分代码省略.........

void DeviceOrientationClientMock::timerFired(Timer<DeviceOrientationClientMock>& timer)
{
    ASSERT_UNUSED(timer, &timer == &m_timer);
    m_timer.stop();
    m_controller->didChangeDeviceOrientation(m_orientation.get());
}

void DatabaseProcessProxy::processWillShutDown(IPC::Connection& connection)
{
    ASSERT_UNUSED(connection, this->connection() == &connection);
}

void generate(Code& code, CCallHelpers& jit)
{
    // We don't expect the incoming code to have predecessors computed.
    code.resetReachability();
    
    if (shouldValidateIR())
        validate(code);

    // If we're doing super verbose dumping, the phase scope of any phase will already do a dump.
    if (shouldDumpIR() && !shouldDumpIRAtEachPhase()) {
        dataLog("Initial air:\n");
        dataLog(code);
    }

    // This is where we run our optimizations and transformations.
    // FIXME: Add Air optimizations.
    // https://bugs.webkit.org/show_bug.cgi?id=150456

    // This is where we would have a real register allocator. Then, we could use spillEverything()
    // in place of the register allocator only for testing.
    // FIXME: https://bugs.webkit.org/show_bug.cgi?id=150457
    spillEverything(code);

    // Prior to this point the prologue and epilogue is implicit. This makes it explicit. It also
    // does things like identify which callee-saves we're using and saves them.
    handleCalleeSaves(code);

    // This turns all Stack and CallArg Args into Addr args that use the frame pointer. It does
    // this by first-fit allocating stack slots. It should be pretty darn close to optimal, so we
    // shouldn't have to worry about this very much.
    allocateStack(code);

    // FIXME: We should really have a code layout optimization here.
    // https://bugs.webkit.org/show_bug.cgi?id=150478

    // FIXME: We need a late liveness analysis over registers to fill in the
    // Special::reportUsedRegisters().
    // https://bugs.webkit.org/show_bug.cgi?id=150511

    if (shouldValidateIR())
        validate(code);

    // Do a final dump of Air. Note that we have to do this even if we are doing per-phase dumping,
    // since the final generation is not a phase.
    if (shouldDumpIR()) {
        dataLog("Air after ", code.lastPhaseName(), ", before generation:\n");
        dataLog(code);
    }

    // And now, we generate code.
    jit.emitFunctionPrologue();
    jit.addPtr(CCallHelpers::TrustedImm32(-code.frameSize()), MacroAssembler::stackPointerRegister);

    GenerationContext context;
    context.code = &code;
    IndexMap<BasicBlock, CCallHelpers::Label> blockLabels(code.size());
    IndexMap<BasicBlock, CCallHelpers::JumpList> blockJumps(code.size());

    auto link = [&] (CCallHelpers::Jump jump, BasicBlock* target) {
        if (blockLabels[target].isSet()) {
            jump.linkTo(blockLabels[target], &jit);
            return;
        }

        blockJumps[target].append(jump);
    };

    for (BasicBlock* block : code) {
        blockJumps[block].link(&jit);
        ASSERT(block->size() >= 1);
        for (unsigned i = 0; i < block->size() - 1; ++i) {
            CCallHelpers::Jump jump = block->at(i).generate(jit, context);
            ASSERT_UNUSED(jump, !jump.isSet());
        }

        if (block->last().opcode == Jump
            && block->successorBlock(0) == code.findNextBlock(block))
            continue;

        if (block->last().opcode == Ret) {
            // We currently don't represent the full prologue/epilogue in Air, so we need to
            // have this override.
            jit.emitFunctionEpilogue();
            jit.ret();
            continue;
        }
        
        CCallHelpers::Jump jump = block->last().generate(jit, context);
        for (Inst& inst : *block)
            jump = inst.generate(jit, context);
        switch (block->numSuccessors()) {
        case 0:
            ASSERT(!jump.isSet());
            break;
        case 1:
            link(jump, block->successorBlock(0));
            break;
        case 2:
            link(jump, block->successorBlock(0));
            if (block->successorBlock(1) != code.findNextBlock(block))
//.........这里部分代码省略.........

 void checkConsistency(int offset = 0) const
 {
     ASSERT_UNUSED(offset, m_index + offset >= 0);
     ASSERT_UNUSED(offset, m_index + offset <= static_cast<int>(timerHeap().size()));
 }

InRegionScrollableArea::InRegionScrollableArea(WebPagePrivate* webPage, RenderLayer* layer)
    : m_webPage(webPage)
    , m_layer(layer)
    , m_document(0)
    , m_hasWindowVisibleRectCalculated(false)
{
    ASSERT(webPage);
    ASSERT(layer);
    m_isNull = false;

    // Add a pointer to the enclosing document as the pointer to layer or node along the way may become invalid.
    if (m_layer->enclosingElement())
        m_document = m_layer->enclosingElement()->document();

    // FIXME: Add an ASSERT here as the 'layer' must be scrollable.

    RenderObject* layerRenderer = layer->renderer();
    ASSERT(layerRenderer);

    if (layerRenderer->isRenderView()) { // #document case

        RenderView* renderView = toRenderView(layerRenderer);
        ASSERT(renderView);

        FrameView* view = toRenderView(layerRenderer)->frameView();
        ASSERT(view);

        Frame* frame = view->frame();
        ASSERT_UNUSED(frame, frame);

        const Platform::ViewportAccessor* viewportAccessor = m_webPage->m_webkitThreadViewportAccessor;
        m_scrollPosition = viewportAccessor->roundToPixelFromDocumentContents(WebCore::FloatPoint(view->scrollPosition()));
        m_contentsSize = viewportAccessor->roundToPixelFromDocumentContents(Platform::FloatRect(Platform::FloatPoint::zero(), WebCore::FloatSize(view->contentsSize()))).size();
        m_viewportSize = viewportAccessor->roundToPixelFromDocumentContents(WebCore::FloatRect(view->visibleContentRect(ScrollableArea::ExcludeScrollbars))).size();
        m_documentViewportRect = view->frameRect();

        m_scrollsHorizontally = view->contentsWidth() > view->visibleWidth();
        m_scrollsVertically = view->contentsHeight() > view->visibleHeight();

        m_supportsCompositedScrolling = true;

        m_scrollTarget = InnerFrame;

        ASSERT(!m_cachedNonCompositedScrollableNode);

        m_camouflagedCompositedScrollableLayer = reinterpret_cast<unsigned>(renderView->compositor()->scrollLayer()->platformLayer());
        m_cachedCompositedScrollableLayer = renderView->compositor()->scrollLayer()->platformLayer();

    } else { // RenderBox-based elements case (scrollable boxes (div's, p's, textarea's, etc)).

        RenderBox* box = m_layer->renderBox();
        ASSERT(box);
        ASSERT(InRegionScrollerPrivate::canScrollRenderBox(box));

        const Platform::ViewportAccessor* viewportAccessor = m_webPage->m_webkitThreadViewportAccessor;
        ScrollableArea* scrollableArea = static_cast<ScrollableArea*>(m_layer);

        m_scrollPosition = viewportAccessor->roundToPixelFromDocumentContents(WebCore::FloatPoint(scrollableArea->scrollPosition()));
        m_contentsSize = viewportAccessor->roundToPixelFromDocumentContents(Platform::FloatRect(Platform::FloatPoint::zero(), WebCore::FloatSize(scrollableArea->contentsSize()))).size();
        m_viewportSize = viewportAccessor->roundToPixelFromDocumentContents(WebCore::FloatRect(scrollableArea->visibleContentRect(ScrollableArea::ExcludeScrollbars))).size();
        m_documentViewportRect = enclosingIntRect(box->absoluteClippedOverflowRect());

        m_scrollsHorizontally = box->scrollWidth() != box->clientWidth();
        m_scrollsVertically = box->scrollHeight() != box->clientHeight();

        // Check the overflow if its not an input field because overflow can be set to hidden etc. by the content.
        if (!DOMSupport::isShadowHostTextInputElement(box->node())) {
            m_scrollsHorizontally = m_scrollsHorizontally && box->scrollsOverflowX();
            m_scrollsVertically = m_scrollsVertically && box->scrollsOverflowY();
        }

        m_scrollTarget = BlockElement;

        // Both caches below are self-exclusive.
        if (m_layer->usesCompositedScrolling()) {
            m_forceContentToBeHorizontallyScrollable = m_scrollsHorizontally;
            m_forceContentToBeVerticallyScrollable = m_scrollsVertically;
            // Force content to be scrollable even if it doesn't need to scroll in either direction.
            if (!m_scrollsHorizontally && !m_scrollsVertically) {
                if (box->scrollsOverflowY())
                    m_forceContentToBeVerticallyScrollable = true;
                else if (box->scrollsOverflowX()) // If it's already forced scrollable vertically, don't force it to scroll horizontally
                    m_forceContentToBeHorizontallyScrollable = true;
            }
            m_supportsCompositedScrolling = true;
            ASSERT(m_layer->backing()->hasScrollingLayer());
            m_camouflagedCompositedScrollableLayer = reinterpret_cast<unsigned>(m_layer->backing()->scrollingContentsLayer()->platformLayer());
            m_cachedCompositedScrollableLayer = m_layer->backing()->scrollingContentsLayer()->platformLayer();
            ASSERT(!m_cachedNonCompositedScrollableNode);
        } else {
            m_camouflagedCompositedScrollableLayer = reinterpret_cast<unsigned>(m_layer->enclosingElement());
            m_cachedNonCompositedScrollableNode = m_layer->enclosingElement();
            ASSERT(!m_cachedCompositedScrollableLayer);
        }
    }
}