reduce PsiLock contention: don't take it when there's no AST reference to clear

diff --git a/platform/core-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java b/platform/core-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
index 8659b8d92036dbe6ef00aefd685344845d92dc43..3bc81989c02abefab8c1fb088c787f8dc1dfd791 100644 (file)
--- a/platform/core-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
+++ b/platform/core-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
@@ -126,7 +126,9 @@ public abstract class PsiFileImpl extends ElementBase implements PsiFileEx, PsiF
 
   private FileElement derefTreeElement() {
     Getter<FileElement> pointer = myTreeElementPointer;
-    FileElement treeElement = SoftReference.deref(pointer);
+    if (pointer == null) return null;
+
+    FileElement treeElement = pointer.get();
     if (treeElement != null) return treeElement;
 
     synchronized (PsiLock.LOCK) {