Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2014, 2019, 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.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/javaClasses.hpp"

 #include "jfr/leakprofiler/chains/edge.hpp"

 #include "jfr/leakprofiler/chains/edgeStore.hpp"

 #include "jfr/leakprofiler/chains/edgeUtils.hpp"

 #include "jfr/leakprofiler/utilities/unifiedOop.hpp"

 #include "oops/fieldStreams.hpp"

 #include "oops/instanceKlass.hpp"

 #include "oops/objArrayOop.hpp"

 #include "oops/oopsHierarchy.hpp"

 #include "runtime/handles.inline.hpp"

 bool EdgeUtils::is_leak_edge(const Edge& edge) {

   return (const Edge*)edge.pointee()->mark() == &edge;

 }

 static int field_offset(const StoredEdge& edge) {

   assert(!edge.is_root(), "invariant");

   const oop ref_owner = edge.reference_owner();

   assert(ref_owner != NULL, "invariant");

   const oop* reference = UnifiedOop::decode(edge.reference());

   assert(reference != NULL, "invariant");

   assert(!UnifiedOop::is_narrow(reference), "invariant");

   assert(!ref_owner->is_array(), "invariant");

   assert(ref_owner->is_instance(), "invariant");

   const int offset = (int)pointer_delta(reference, ref_owner, sizeof(char));

   assert(offset < (ref_owner->size() * HeapWordSize), "invariant");

   return offset;

 }

 static const InstanceKlass* field_type(const StoredEdge& edge) {

   assert(!edge.is_root() || !EdgeUtils::is_array_element(edge), "invariant");

   return (const InstanceKlass*)edge.reference_owner_klass();

 }

 const Symbol* EdgeUtils::field_name_symbol(const Edge& edge) {

   assert(!edge.is_root(), "invariant");

   assert(!is_array_element(edge), "invariant");

   const int offset = field_offset(edge);

   const InstanceKlass* ik = field_type(edge);

   while (ik != NULL) {

     JavaFieldStream jfs(ik);

     while (!jfs.done()) {

       if (offset == jfs.offset()) {

         return jfs.name();

       }

       jfs.next();

     }

     ik = (InstanceKlass*)ik->super();

   }

   return NULL;

 }

 jshort EdgeUtils::field_modifiers(const Edge& edge) {

   const int offset = field_offset(edge);

   const InstanceKlass* ik = field_type(edge);

   while (ik != NULL) {

     JavaFieldStream jfs(ik);

     while (!jfs.done()) {

       if (offset == jfs.offset()) {

         return jfs.access_flags().as_short();

       }

       jfs.next();

     }

     ik = (InstanceKlass*)ik->super();

   }

   return 0;

 }

 bool EdgeUtils::is_array_element(const Edge& edge) {

   assert(!edge.is_root(), "invariant");

   const oop ref_owner = edge.reference_owner();

   assert(ref_owner != NULL, "invariant");

   return ref_owner->is_objArray();

 }

 static int array_offset(const Edge& edge) {

   assert(!edge.is_root(), "invariant");

   const oop ref_owner = edge.reference_owner();

   assert(ref_owner != NULL, "invariant");

   const oop* reference = UnifiedOop::decode(edge.reference());

   assert(reference != NULL, "invariant");

   assert(!UnifiedOop::is_narrow(reference), "invariant");

   assert(ref_owner->is_array(), "invariant");

   const objArrayOop ref_owner_array = static_cast<const objArrayOop>(ref_owner);

   const int offset = (int)pointer_delta(reference, ref_owner_array->base(), heapOopSize);

   assert(offset >= 0 && offset < ref_owner_array->length(), "invariant");

   return offset;

 }

 int EdgeUtils::array_index(const Edge& edge) {

   return is_array_element(edge) ? array_offset(edge) : 0;

 }

 int EdgeUtils::array_size(const Edge& edge) {

   if (is_array_element(edge)) {

     const oop ref_owner = edge.reference_owner();

     assert(ref_owner != NULL, "invariant");

     assert(ref_owner->is_objArray(), "invariant");

     return ((objArrayOop)(ref_owner))->length();

   }

   return 0;

 }

 const Edge* EdgeUtils::root(const Edge& edge) {

   const Edge* current = &edge;

   const Edge* parent = current->parent();

   while (parent != NULL) {

     current = parent;

     parent = current->parent();

   }

   assert(current != NULL, "invariant");

   return current;

 }

 const Edge* EdgeUtils::ancestor(const Edge& edge, size_t distance) {

   const Edge* current = &edge;

   const Edge* parent = current->parent();

   size_t seek = 0;

   while (parent != NULL && seek != distance) {

     seek++;

     current = parent;

     parent = parent->parent();

   }

   return current;

 }