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

*** 1,7 ****
  /*
!  * Copyright (c) 2015, 2016, 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
--- 1,7 ----
  /*
!  * 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
*** 36,89 ****
          SharedSecrets.getJavaLangInvokeAccess();
  
      // Footprint improvement: MemberName::clazz can replace
      // StackFrameInfo::declaringClass.
  
!     private final StackWalker walker;
!     private final Class<?> declaringClass;
      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.bci = -1;
          this.memberName = JLIA.newMemberName();
      }
  
      // package-private called by StackStreamFactory to skip
      // the capability check
      Class<?> declaringClass() {
!         return declaringClass;
      }
  
      // ----- implementation of StackFrame methods
  
      @Override
      public String getClassName() {
!         return declaringClass.getName();
      }
  
      @Override
      public Class<?> getDeclaringClass() {
!         walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE);
!         return declaringClass;
      }
  
      @Override
      public String getMethodName() {
          return JLIA.getName(memberName);
      }
  
      @Override
      public MethodType getMethodType() {
!         walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE);
          return JLIA.getMethodType(memberName);
      }
  
      @Override
      public String getDescriptor() {
--- 36,87 ----
          SharedSecrets.getJavaLangInvokeAccess();
  
      // Footprint improvement: MemberName::clazz can replace
      // StackFrameInfo::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.retainClassRef = walker.retainClassRef;
          this.bci = -1;
          this.memberName = JLIA.newMemberName();
      }
  
      // package-private called by StackStreamFactory to skip
      // the capability check
      Class<?> declaringClass() {
!         return JLIA.getDeclaringClass(memberName);
      }
  
      // ----- implementation of StackFrame methods
  
      @Override
      public String getClassName() {
!         return declaringClass().getName();
      }
  
      @Override
      public Class<?> getDeclaringClass() {
!         ensureRetainClassRefEnabled();
!         return declaringClass();
      }
  
      @Override
      public String getMethodName() {
          return JLIA.getName(memberName);
      }
  
      @Override
      public MethodType getMethodType() {
!         ensureRetainClassRefEnabled();
          return JLIA.getMethodType(memberName);
      }
  
      @Override
      public String getDescriptor() {
*** 135,140 ****
--- 133,144 ----
                  }
              }
          }
          return s;
      }
+ 
+     private void ensureRetainClassRefEnabled() {
+         if (!retainClassRef) {
+             throw new UnsupportedOperationException("No access to RETAIN_CLASS_REFERENCE");
+         }
+     }
  }