Bug 1309818 - Fixing some warning when compiling dom/*, r=smaug

dom/base/nsContentIterator.cpp

@@ -1313,7 +1313,7 @@ nsContentSubtreeIterator::Init(nsIDOMRange* aRange)
   // find first node in range
   int32_t offset = mRange->StartOffset();
 
-  nsINode* node;
+  nsINode* node = nullptr;
   if (!startParent->GetChildCount()) {
     // no children, start at the node itself
     node = startParent;

dom/events/ContentEventHandler.cpp

@@ -1313,7 +1313,7 @@ ContentEventHandler::OnQuerySelectedText(WidgetQueryContentEvent* aEvent)
   NS_ENSURE_SUCCESS(rv, rv);
 
   nsCOMPtr<nsINode> anchorNode, focusNode;
-  int32_t anchorOffset, focusOffset;
+  int32_t anchorOffset = 0, focusOffset = 0;
   if (mSelection->RangeCount()) {
     // If there is only one selection range, the anchor/focus node and offset
     // are the information of the range.  Therefore, we have the direction
@@ -1813,7 +1813,7 @@ ContentEventHandler::OnQueryTextRectArray(WidgetQueryContentEvent* aEvent)
   // charRect).
   nsRect lastCharRect;
   // lastFrame is base frame of lastCharRect.
-  nsIFrame* lastFrame;
+  nsIFrame* lastFrame = nullptr;
   while (offset < kEndOffset) {
     nsCOMPtr<nsIContent> lastTextContent;
     rv = SetRangeFromFlatTextOffset(range, offset, 1, lineBreakType, true,

dom/security/nsMixedContentBlocker.cpp

@@ -106,7 +106,7 @@ public:
     // If there is no securityUI, document doesn't have a security state to
     // update.  But we still want to set the document flags, so we don't return
     // early.
-    nsresult stateRV;
+    nsresult stateRV = NS_ERROR_FAILURE;
     if (securityUI) {
       stateRV = securityUI->GetState(&state);
     }

js/xpconnect/src/XPCWrappedNativeJSOps.cpp

@@ -835,9 +835,9 @@ XPC_WN_Helper_Resolve(JSContext* cx, HandleObject obj, HandleId id, bool* resolv
         XPCNativeSet* set = wrapper->GetSet();
         XPCNativeSet* protoSet = wrapper->HasProto() ?
                                     wrapper->GetProto()->GetSet() : nullptr;
-        XPCNativeMember* member;
+        XPCNativeMember* member = nullptr;
         RefPtr<XPCNativeInterface> iface;
-        bool IsLocal;
+        bool IsLocal = false;
 
         if (set->FindMember(id, &member, &iface, protoSet, &IsLocal) &&
             IsLocal) {

layout/tables/nsTableFrame.cpp

@@ -2431,7 +2431,7 @@ nsTableFrame::HomogenousInsertFrames(ChildListID     aListID,
       // over...  Oh, well.
       nsIFrame* pseudoFrame = aFrameList.FirstChild();
       nsIContent* parentContent = GetContent();
-      nsIContent* content;
+      nsIContent* content = nullptr;
       aPrevFrame = nullptr;
       while (pseudoFrame  && (parentContent ==
                               (content = pseudoFrame->GetContent()))) {
@@ -2441,7 +2441,7 @@ nsTableFrame::HomogenousInsertFrames(ChildListID     aListID,
       if (MOZ_LIKELY(container)) { // XXX need this null-check, see bug 411823.
         int32_t newIndex = container->IndexOf(content);
         nsIFrame* kidFrame;
-        nsTableColGroupFrame* lastColGroup;
+        nsTableColGroupFrame* lastColGroup = nullptr;
         if (isColGroup) {
           kidFrame = mColGroups.FirstChild();
           lastColGroup = nsTableColGroupFrame::GetLastRealColGroup(this);

layout/tables/nsTableWrapperFrame.cpp

@@ -845,7 +845,7 @@ nsTableWrapperFrame::Reflow(nsPresContext*           aPresContext,
     InnerTableFrame()->HasAnyStateBits(NS_FRAME_FIRST_REFLOW);
   nsRect origCaptionRect;
   nsRect origCaptionVisualOverflow;
-  bool captionFirstReflow;
+  bool captionFirstReflow = false;
   if (mCaptionFrames.NotEmpty()) {
     origCaptionRect = mCaptionFrames.FirstChild()->GetRect();
     origCaptionVisualOverflow =

layout/xul/nsMenuPopupFrame.cpp

@@ -1324,7 +1324,7 @@ nsMenuPopupFrame::SetPopupPosition(nsIFrame* aAnchorFrame, bool aIsMove, bool aS
   nsRect anchorRect;
 
   // Width of the parent, used when aSizedToPopup is true.
-  int32_t parentWidth;
+  int32_t parentWidth = 0;
 
   bool anchored = IsAnchored();
   if (anchored || aSizedToPopup) {

layout/xul/nsSprocketLayout.cpp

@@ -932,7 +932,7 @@ nsSprocketLayout::AlignChildren(nsIFrame* aBox,
   // These are only calculated if needed
   nsIFrame::Halignment halign;
   nsIFrame::Valignment valign;
-  nscoord maxAscent;
+  nscoord maxAscent = 0;
   bool isLTR;
 
   if (isHorizontal) {
@@ -957,7 +957,7 @@ nsSprocketLayout::AlignChildren(nsIFrame* aBox,
       const nscoord endAlign =
         clientRect.YMost() - margin.bottom - childRect.height;
 
-      nscoord y;
+      nscoord y = 0;
       switch (valign) {
         case nsBoxFrame::vAlign_Top:
           y = startAlign;
@@ -986,7 +986,7 @@ nsSprocketLayout::AlignChildren(nsIFrame* aBox,
       const nscoord rightAlign =
         clientRect.XMost() - margin.right - childRect.width;
 
-      nscoord x;
+      nscoord x = 0;
       switch (halign) {
         case nsBoxFrame::hAlign_Left: // start
           x = isLTR ? leftAlign : rightAlign;

layout/xul/nsTextBoxFrame.cpp

@@ -399,12 +399,12 @@ nsTextBoxFrame::DrawText(nsRenderingContext& aRenderingContext,
     DrawTarget* drawTarget = aRenderingContext.GetDrawTarget();
 
     // paint the title
-    nscolor overColor;
+    nscolor overColor = 0;
-    nscolor underColor;
+    nscolor underColor = 0;
-    nscolor strikeColor;
+    nscolor strikeColor = 0;
-    uint8_t overStyle;
+    uint8_t overStyle = 0;
-    uint8_t underStyle;
+    uint8_t underStyle = 0;
-    uint8_t strikeStyle;
+    uint8_t strikeStyle = 0;
 
     // Begin with no decorations
     uint8_t decorations = NS_STYLE_TEXT_DECORATION_LINE_NONE;

layout/xul/tree/TreeBoxObject.cpp

@@ -93,7 +93,7 @@ TreeBoxObject::GetTreeBodyFrame(bool aFlushLayout)
   // is true we need to make sure to flush no matter what.
   // XXXbz except that flushing style when we were not asked to flush
   // layout here breaks things.  See bug 585123.
-  nsIFrame* frame;
+  nsIFrame* frame = nullptr;
   if (aFlushLayout) {
     frame = GetFrame(aFlushLayout);
     if (!frame)