3 files changed, 16 insertions, 0 deletions
diff --git a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
index d4506c7bb1..45866642c5 100644
--- a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
+++ b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
@@ -11,6 +11,7 @@
 #include <utility>
 #include <vector>
 
+#include "core/fxcrt/fx_fallthrough.h"
 #include "fxjs/xfa/cjx_object.h"
 #include "third_party/base/logging.h"
 #include "third_party/base/ptr_util.h"
@@ -867,6 +868,7 @@ void CXFA_ItemLayoutProcessor::GotoNextContainerNode(
     }
     case XFA_ItemLayoutProcessorStages::None: {
       pCurActionNode = XFA_LAYOUT_INVALIDNODE;
+      FX_FALLTHROUGH;
       case XFA_ItemLayoutProcessorStages::BookendLeader:
         for (CXFA_Node* pBookendNode = pCurActionNode == XFA_LAYOUT_INVALIDNODE
                                            ? pEntireContainer->GetFirstChild()
@@ -885,6 +887,7 @@ void CXFA_ItemLayoutProcessor::GotoNextContainerNode(
     }
       {
         pCurActionNode = XFA_LAYOUT_INVALIDNODE;
+        FX_FALLTHROUGH;
         case XFA_ItemLayoutProcessorStages::BreakBefore:
           if (pCurActionNode != XFA_LAYOUT_INVALIDNODE) {
             CXFA_Node* pBreakBeforeNode = pCurActionNode->GetNextSibling();
@@ -908,6 +911,7 @@ void CXFA_ItemLayoutProcessor::GotoNextContainerNode(
       }
     case XFA_ItemLayoutProcessorStages::Container: {
       pCurActionNode = XFA_LAYOUT_INVALIDNODE;
+      FX_FALLTHROUGH;
       case XFA_ItemLayoutProcessorStages::BreakAfter: {
         if (pCurActionNode == XFA_LAYOUT_INVALIDNODE) {
           CXFA_Node* pBreakAfterNode = pChildContainer->GetFirstChild();
@@ -962,6 +966,7 @@ void CXFA_ItemLayoutProcessor::GotoNextContainerNode(
 
     NoMoreChildContainer : {
       pCurActionNode = XFA_LAYOUT_INVALIDNODE;
+      FX_FALLTHROUGH;
       case XFA_ItemLayoutProcessorStages::BookendTrailer:
         for (CXFA_Node* pBookendNode = pCurActionNode == XFA_LAYOUT_INVALIDNODE
                                            ? pEntireContainer->GetFirstChild()
@@ -978,6 +983,7 @@ void CXFA_ItemLayoutProcessor::GotoNextContainerNode(
           }
         }
     }
+      FX_FALLTHROUGH;
     default:
       pCurActionNode = nullptr;
       *nCurStage = XFA_ItemLayoutProcessorStages::Done;
@@ -1959,8 +1965,10 @@ XFA_ItemLayoutProcessorResult CXFA_ItemLayoutProcessor::DoLayoutFlowedContainer(
           switch (rs) {
             case XFA_ItemLayoutProcessorResult::ManualBreak:
               bIsManualBreak = true;
+              FX_FALLTHROUGH;
             case XFA_ItemLayoutProcessorResult::PageFullBreak:
               bForceEndPage = true;
+              FX_FALLTHROUGH;
             case XFA_ItemLayoutProcessorResult::RowFullBreak:
               goto SuspendAndCreateNewRow;
             case XFA_ItemLayoutProcessorResult::Done:
@@ -1968,6 +1976,7 @@ XFA_ItemLayoutProcessorResult CXFA_ItemLayoutProcessor::DoLayoutFlowedContainer(
               fContentCurRowY +=
                   pProcessor->InsertPendingItems(m_pCurChildNode);
               pProcessor.reset();
+              break;
           }
           break;
         }
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index bfee8fa746..77b6f74fe4 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -18,6 +18,7 @@
 #include "core/fxcrt/cfx_memorystream.h"
 #include "core/fxcrt/fx_codepage.h"
 #include "core/fxcrt/fx_extension.h"
+#include "core/fxcrt/fx_fallthrough.h"
 #include "core/fxcrt/xml/cfx_xmlelement.h"
 #include "core/fxcrt/xml/cfx_xmlnode.h"
 #include "core/fxcrt/xml/cfx_xmltext.h"
@@ -2622,6 +2623,7 @@ void CXFA_Node::ResetData() {
     }
     case XFA_FFWidgetType::kChoiceList:
       ClearAllSelections();
+      FX_FALLTHROUGH;
     default: {
       CXFA_Value* defValue = GetDefaultValueIfExists();
       if (defValue)
@@ -2762,6 +2764,7 @@ bool CXFA_Node::CalculateFieldAutoSize(CXFA_FFDoc* doc, CFX_SizeF& size) {
       case XFA_AttributeEnum::Bottom: {
         size.height += szCap.height;
         size.width = std::max(size.width, szCap.width);
+        break;
       }
       default:
         break;
@@ -2858,6 +2861,7 @@ bool CXFA_Node::CalculateTextEditAutoSize(CXFA_FFDoc* doc, CFX_SizeF& size) {
         case XFA_AttributeEnum::Right:
         case XFA_AttributeEnum::Inline: {
           size.width -= szCap.width;
+          break;
         }
         default:
           break;
@@ -2881,6 +2885,7 @@ bool CXFA_Node::CalculateTextEditAutoSize(CXFA_FFDoc* doc, CFX_SizeF& size) {
         case XFA_AttributeEnum::Top:
         case XFA_AttributeEnum::Bottom: {
           size.height += szCap.height;
+          break;
         }
         default:
           break;
diff --git a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
index b7cab02b3d..ac14731bb1 100644
--- a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
+++ b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "core/fxcrt/fx_extension.h"
+#include "core/fxcrt/fx_fallthrough.h"
 #include "core/fxcrt/xml/cfx_xmlelement.h"
 #include "core/fxcrt/xml/cfx_xmlnode.h"
 #include "fxjs/cfxjse_engine.h"
@@ -630,6 +631,7 @@ CXFA_Node* FindMatchingDataNode(
           pResult = pGlobalBindNode;
           break;
         }
+        FX_FALLTHROUGH;
       case XFA_AttributeEnum::Once: {
         bAccessedDataDOM = true;
         CXFA_Node* pOnceBindNode = FindOnceDataNode(