1 files changed, 28 insertions, 5 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGAvailability.h b/Source/JavaScriptCore/dfg/DFGAvailability.h
index fd9bf6529..6d157f547 100644
--- a/Source/JavaScriptCore/dfg/DFGAvailability.h
+++ b/Source/JavaScriptCore/dfg/DFGAvailability.h
@@ -23,8 +23,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-#ifndef DFGAvailability_h
-#define DFGAvailability_h
+#pragma once
 
 #if ENABLE(DFG_JIT)
 
@@ -81,10 +80,26 @@ public:
         return withNode(unavailableMarker());
     }
     
+    void setFlush(FlushedAt flushedAt)
+    {
+        m_flushedAt = flushedAt;
+    }
+    
+    void setNode(Node* node)
+    {
+        m_node = node;
+    }
+    
+    void setNodeUnavailable()
+    {
+        m_node = unavailableMarker();
+    }
+    
     bool nodeIsUndecided() const { return !m_node; }
     bool nodeIsUnavailable() const { return m_node == unavailableMarker(); }
     
     bool hasNode() const { return !nodeIsUndecided() && !nodeIsUnavailable(); }
+    bool shouldUseNode() const { return !isFlushUseful() && hasNode(); }
     
     Node* node() const
     {
@@ -94,6 +109,12 @@ public:
     }
     
     FlushedAt flushedAt() const { return m_flushedAt; }
+    bool isFlushUseful() const
+    {
+        return flushedAt().format() != DeadFlush && flushedAt().format() != ConflictingFlush;
+    }
+    
+    bool isDead() const { return !isFlushUseful() && !hasNode(); }
     
     bool operator!() const { return nodeIsUnavailable() && flushedAt().format() == ConflictingFlush; }
 
@@ -103,6 +124,11 @@ public:
             && m_flushedAt == other.m_flushedAt;
     }
     
+    bool operator!=(const Availability& other) const
+    {
+        return !(*this == other);
+    }
+    
     Availability merge(const Availability& other) const
     {
         return Availability(
@@ -137,6 +163,3 @@ private:
 } } // namespace JSC::DFG
 
 #endif // ENABLE(DFG_JIT)
-
-#endif // DFGAvailability_h
-