jdk8-mips64-public/hotspot: src/share/vm/utilities/nativeCallStack.hpp@833b0f92429a (annotated)

src/share/vm/utilities/nativeCallStack.hpp@833b0f92429a (annotated)

src/share/vm/utilities/nativeCallStack.hpp

Wed, 27 Aug 2014 08:19:12 -0400

author: zgu
date: Wed, 27 Aug 2014 08:19:12 -0400
changeset 7074: 833b0f92429a
child 7078: c6211b707068
permissions: -rw-r--r--

8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill

 /*
  * Copyright (c) 2014, 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.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_UTILITIES_NATIVE_CALL_STACK_HPP
 #define SHARE_VM_UTILITIES_NATIVE_CALL_STACK_HPP
 #include "memory/allocation.hpp"
 #include "services/nmtCommon.hpp"
 #include "utilities/ostream.hpp"
 /*
  * This class represents a native call path (does not include Java frame)
  *
  * This class is developed in the context of native memory tracking, it can
  * be an useful tool for debugging purpose.
  *
  * For example, following code should print out native call path:
  *
  *   ....
  *   NativeCallStack here;
  *   here.print_on(tty);
  *   ....
  *
  * However, there are a couple of restrictions on this class. If the restrictions are
  * not strictly followed, it may break native memory tracking badly.
  *
  * 1. Number of stack frames to capture, is defined by native memory tracking.
  *    This number has impacts on how much memory to be used by native
  *    memory tracking.
  * 2. The class is strict stack object, no heap or virtual memory can be allocated
  *    from it.
  */
 class NativeCallStack : public StackObj {
  private:
   address   _stack[NMT_TrackingStackDepth];
   int       _hash_value;
  public:
   NativeCallStack(int toSkip = 0, bool fillStack = false);
   NativeCallStack(address* pc, int frameCount);
   // if it is an empty stack
   inline bool is_empty() const {
     return _stack[0] == NULL;
   }
   // number of stack frames captured
   int frames() const;
   inline int compare(const NativeCallStack& other) const {
     return memcmp(_stack, other._stack, sizeof(_stack));
   }
   inline bool equals(const NativeCallStack& other) const {
     // compare hash values
     if (hash() != other.hash()) return false;
     // compare each frame
     return compare(other) == 0;
   }
   inline address get_frame(int index) const {
     assert(index >= 0 && index < NMT_TrackingStackDepth, "Index out of bound");
     return _stack[index];
   }
   // Hash code. Any better algorithm?
   int hash() const;
   void print_on(outputStream* out) const;
   void print_on(outputStream* out, int indent) const;
 };
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/nativeCallStack.hpp@833b0f92429a (annotated)

src/share/vm/utilities/nativeCallStack.hpp