src/java.base/share/classes/java/lang/StackFrameInfo.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -36,54 +36,52 @@
         SharedSecrets.getJavaLangInvokeAccess();
 
     // Footprint improvement: MemberName::clazz can replace
     // StackFrameInfo::declaringClass.
 
-    private final StackWalker walker;
-    private final Class<?> declaringClass;
+    private final boolean retainClassRef;
     private final Object memberName;
     private final short bci;
     private volatile StackTraceElement ste;
 
     /*
      * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser
      * to use
      */
     StackFrameInfo(StackWalker walker) {
-        this.walker = walker;
-        this.declaringClass = null;
+        this.retainClassRef = walker.retainClassRef;
         this.bci = -1;
         this.memberName = JLIA.newMemberName();
     }
 
     // package-private called by StackStreamFactory to skip
     // the capability check
     Class<?> declaringClass() {
-        return declaringClass;
+        return JLIA.getDeclaringClass(memberName);
     }
 
     // ----- implementation of StackFrame methods
 
     @Override
     public String getClassName() {
-        return declaringClass.getName();
+        return declaringClass().getName();
     }
 
     @Override
     public Class<?> getDeclaringClass() {
-        walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE);
-        return declaringClass;
+        ensureRetainClassRefEnabled();
+        return declaringClass();
     }
 
     @Override
     public String getMethodName() {
         return JLIA.getName(memberName);
     }
 
     @Override
     public MethodType getMethodType() {
-        walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE);
+        ensureRetainClassRefEnabled();
         return JLIA.getMethodType(memberName);
     }
 
     @Override
     public String getDescriptor() {

@@ -135,6 +133,12 @@
                 }
             }
         }
         return s;
     }
+
+    private void ensureRetainClassRefEnabled() {
+        if (!retainClassRef) {
+            throw new UnsupportedOperationException("No access to RETAIN_CLASS_REFERENCE");
+        }
+    }
 }