author | mgronlun |
Sat, 24 Aug 2019 14:30:27 +0200 | |
branch | JEP-349-branch |
changeset 57870 | 00860d9caf4d |
parent 50113 | caf115bb98ad |
child 57983 | a57907813a83 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "jfr/leakprofiler/chains/edgeStore.hpp" |
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#include "jfr/leakprofiler/chains/edgeUtils.hpp" |
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#include "oops/oop.inline.hpp" |
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||
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StoredEdge::StoredEdge() : Edge() {} |
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StoredEdge::StoredEdge(const Edge* parent, const oop* reference) : Edge(parent, reference), _gc_root_id(0), _skip_length(0) {} |
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StoredEdge::StoredEdge(const Edge& edge) : Edge(edge), _gc_root_id(0), _skip_length(0) {} |
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StoredEdge::StoredEdge(const StoredEdge& edge) : Edge(edge), _gc_root_id(edge._gc_root_id), _skip_length(edge._skip_length) {} |
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void StoredEdge::operator=(const StoredEdge& edge) { |
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Edge::operator=(edge); |
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_gc_root_id = edge._gc_root_id; |
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_skip_length = edge._skip_length; |
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} |
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traceid EdgeStore::_edge_id_counter = 0; |
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EdgeStore::EdgeStore() : _edges(NULL) { |
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_edges = new EdgeHashTable(this); |
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} |
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EdgeStore::~EdgeStore() { |
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assert(_edges != NULL, "invariant"); |
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delete _edges; |
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} |
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bool EdgeStore::is_empty() const { |
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return !_edges->has_entries(); |
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} |
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void EdgeStore::assign_id(EdgeEntry* entry) { |
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assert(entry != NULL, "invariant"); |
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assert(entry->id() == 0, "invariant"); |
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entry->set_id(++_edge_id_counter); |
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} |
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bool EdgeStore::equals(const Edge& query, uintptr_t hash, const EdgeEntry* entry) { |
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assert(entry != NULL, "invariant"); |
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assert(entry->hash() == hash, "invariant"); |
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return true; |
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} |
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void EdgeStore::unlink(EdgeEntry* entry) { |
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assert(entry != NULL, "invariant"); |
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// nothing |
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} |
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#ifdef ASSERT |
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bool EdgeStore::contains(const oop* reference) const { |
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return get(reference) != NULL; |
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} |
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#endif |
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StoredEdge* EdgeStore::get(const oop* reference) const { |
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assert(reference != NULL, "invariant"); |
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const StoredEdge e(NULL, reference); |
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EdgeEntry* const entry = _edges->lookup_only(e, (uintptr_t)reference); |
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return entry != NULL ? entry->literal_addr() : NULL; |
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} |
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StoredEdge* EdgeStore::put(const oop* reference) { |
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assert(reference != NULL, "invariant"); |
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const StoredEdge e(NULL, reference); |
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assert(NULL == _edges->lookup_only(e, (uintptr_t)reference), "invariant"); |
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EdgeEntry& entry = _edges->put(e, (uintptr_t)reference); |
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return entry.literal_addr(); |
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} |
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traceid EdgeStore::get_id(const Edge* edge) const { |
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assert(edge != NULL, "invariant"); |
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EdgeEntry* const entry = _edges->lookup_only(*edge, (uintptr_t)edge->reference()); |
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assert(entry != NULL, "invariant"); |
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return entry->id(); |
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} |
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traceid EdgeStore::gc_root_id(const Edge* edge) const { |
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assert(edge != NULL, "invariant"); |
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const traceid gc_root_id = static_cast<const StoredEdge*>(edge)->gc_root_id(); |
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if (gc_root_id != 0) { |
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return gc_root_id; |
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} |
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// not cached |
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assert(edge != NULL, "invariant"); |
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const Edge* const root = EdgeUtils::root(*edge); |
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assert(root != NULL, "invariant"); |
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assert(root->parent() == NULL, "invariant"); |
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return get_id(root); |
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} |
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static const Edge* get_skip_ancestor(const Edge** current, size_t distance_to_root, size_t* skip_length) { |
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assert(distance_to_root >= EdgeUtils::root_context, "invariant"); |
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assert(*skip_length == 0, "invariant"); |
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*skip_length = distance_to_root - (EdgeUtils::root_context - 1); |
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const Edge* const target = EdgeUtils::ancestor(**current, *skip_length); |
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assert(target != NULL, "invariant"); |
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assert(target->distance_to_root() + 1 == EdgeUtils::root_context, "invariant"); |
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return target; |
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} |
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bool EdgeStore::put_skip_edge(StoredEdge** previous, const Edge** current, size_t distance_to_root) { |
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assert(*previous != NULL, "invariant"); |
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assert((*previous)->parent() == NULL, "invariant"); |
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assert(*current != NULL, "invariant"); |
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assert((*current)->distance_to_root() == distance_to_root, "invariant"); |
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if (distance_to_root < EdgeUtils::root_context) { |
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// nothing to skip |
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return false; |
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} |
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size_t skip_length = 0; |
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const Edge* const skip_ancestor = get_skip_ancestor(current, distance_to_root, &skip_length); |
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assert(skip_ancestor != NULL, "invariant"); |
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(*previous)->set_skip_length(skip_length); |
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|
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// lookup target |
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StoredEdge* stored_target = get(skip_ancestor->reference()); |
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if (stored_target != NULL) { |
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(*previous)->set_parent(stored_target); |
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// linked to existing, complete |
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return true; |
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} |
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assert(stored_target == NULL, "invariant"); |
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stored_target = put(skip_ancestor->reference()); |
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assert(stored_target != NULL, "invariant"); |
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(*previous)->set_parent(stored_target); |
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*previous = stored_target; |
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*current = skip_ancestor->parent(); |
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return false; |
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} |
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159 |
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static void link_edge(const StoredEdge* current_stored, StoredEdge** previous) { |
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assert(current_stored != NULL, "invariant"); |
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assert(*previous != NULL, "invariant"); |
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assert((*previous)->parent() == NULL, "invariant"); |
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(*previous)->set_parent(current_stored); |
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} |
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166 |
|
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static const StoredEdge* find_closest_skip_edge(const StoredEdge* edge, size_t* distance) { |
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assert(edge != NULL, "invariant"); |
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assert(distance != NULL, "invariant"); |
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const StoredEdge* current = edge; |
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*distance = 1; |
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while (current != NULL && !current->is_skip_edge()) { |
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++(*distance); |
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current = current->parent(); |
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} |
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return current; |
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177 |
} |
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178 |
|
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void EdgeStore::link_with_existing_chain(const StoredEdge* current_stored, StoredEdge** previous, size_t previous_length) { |
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assert(current_stored != NULL, "invariant"); |
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assert((*previous)->parent() == NULL, "invariant"); |
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size_t distance_to_skip_edge; // including the skip edge itself |
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const StoredEdge* const closest_skip_edge = find_closest_skip_edge(current_stored, &distance_to_skip_edge); |
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if (closest_skip_edge == NULL) { |
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185 |
// no found skip edge implies root |
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if (distance_to_skip_edge + previous_length <= EdgeUtils::max_ref_chain_depth) { |
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link_edge(current_stored, previous); |
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188 |
return; |
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189 |
} |
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assert(current_stored->distance_to_root() == distance_to_skip_edge - 2, "invariant"); |
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put_skip_edge(previous, reinterpret_cast<const Edge**>(¤t_stored), distance_to_skip_edge - 2); |
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192 |
return; |
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193 |
} |
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194 |
assert(closest_skip_edge->is_skip_edge(), "invariant"); |
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if (distance_to_skip_edge + previous_length <= EdgeUtils::leak_context) { |
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link_edge(current_stored, previous); |
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197 |
return; |
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198 |
} |
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199 |
// create a new skip edge with derived information from closest skip edge |
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(*previous)->set_skip_length(distance_to_skip_edge + closest_skip_edge->skip_length()); |
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201 |
(*previous)->set_parent(closest_skip_edge->parent()); |
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202 |
} |
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203 |
|
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204 |
StoredEdge* EdgeStore::link_new_edge(StoredEdge** previous, const Edge** current) { |
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205 |
assert(*previous != NULL, "invariant"); |
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206 |
assert((*previous)->parent() == NULL, "invariant"); |
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207 |
assert(*current != NULL, "invariant"); |
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208 |
assert(!contains((*current)->reference()), "invariant"); |
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209 |
StoredEdge* const stored_edge = put((*current)->reference()); |
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210 |
assert(stored_edge != NULL, "invariant"); |
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211 |
link_edge(stored_edge, previous); |
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212 |
return stored_edge; |
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213 |
} |
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214 |
|
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215 |
bool EdgeStore::put_edges(StoredEdge** previous, const Edge** current, size_t limit) { |
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216 |
assert(*previous != NULL, "invariant"); |
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217 |
assert(*current != NULL, "invariant"); |
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218 |
size_t depth = 1; |
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219 |
while (*current != NULL && depth < limit) { |
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StoredEdge* stored_edge = get((*current)->reference()); |
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221 |
if (stored_edge != NULL) { |
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222 |
link_with_existing_chain(stored_edge, previous, depth); |
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223 |
return true; |
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224 |
} |
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225 |
stored_edge = link_new_edge(previous, current); |
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226 |
assert((*previous)->parent() != NULL, "invariant"); |
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227 |
*previous = stored_edge; |
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228 |
*current = (*current)->parent(); |
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229 |
++depth; |
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230 |
} |
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231 |
return NULL == *current; |
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232 |
} |
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233 |
|
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234 |
// Install the immediate edge into the mark word of the leak candidate object |
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235 |
StoredEdge* EdgeStore::associate_leak_context_with_candidate(const Edge* edge) { |
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236 |
assert(edge != NULL, "invariant"); |
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237 |
assert(!contains(edge->reference()), "invariant"); |
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238 |
StoredEdge* const leak_context_edge = put(edge->reference()); |
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239 |
oop sample_object = edge->pointee(); |
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assert(sample_object != NULL, "invariant"); |
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assert(NULL == sample_object->mark(), "invariant"); |
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sample_object->set_mark(markOop(leak_context_edge)); |
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return leak_context_edge; |
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} |
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/* |
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* The purpose of put_chain() is to reify the edge sequence |
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* discovered during heap traversal with a normalized logical copy. |
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* This copy consist of two sub-sequences and a connecting link (skip edge). |
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* |
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* "current" can be thought of as the cursor (search) edge, it is not in the edge store. |
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* "previous" is always an edge in the edge store. |
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* The leak context edge is the edge adjacent to the leak candidate object, always an edge in the edge store. |
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*/ |
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void EdgeStore::put_chain(const Edge* chain, size_t length) { |
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assert(chain != NULL, "invariant"); |
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assert(chain->distance_to_root() + 1 == length, "invariant"); |
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StoredEdge* const leak_context_edge = associate_leak_context_with_candidate(chain); |
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assert(leak_context_edge != NULL, "invariant"); |
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assert(leak_context_edge->parent() == NULL, "invariant"); |
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|
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if (1 == length) { |
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return; |
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} |
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|
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const Edge* current = chain->parent(); |
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assert(current != NULL, "invariant"); |
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StoredEdge* previous = leak_context_edge; |
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// a leak context is the sequence of (limited) edges reachable from the leak candidate |
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if (put_edges(&previous, ¤t, EdgeUtils::leak_context)) { |
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// complete |
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assert(previous != NULL, "invariant"); |
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put_chain_epilogue(leak_context_edge, EdgeUtils::root(*previous)); |
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return; |
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} |
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|
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const size_t distance_to_root = length > EdgeUtils::leak_context ? length - 1 - EdgeUtils::leak_context : length - 1; |
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assert(current->distance_to_root() == distance_to_root, "invariant"); |
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|
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// a skip edge is the logical link |
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// connecting the leak context sequence with the root context sequence |
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if (put_skip_edge(&previous, ¤t, distance_to_root)) { |
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// complete |
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assert(previous != NULL, "invariant"); |
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assert(previous->is_skip_edge(), "invariant"); |
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assert(previous->parent() != NULL, "invariant"); |
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put_chain_epilogue(leak_context_edge, EdgeUtils::root(*previous->parent())); |
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return; |
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} |
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|
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assert(current->distance_to_root() < EdgeUtils::root_context, "invariant"); |
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293 |
|
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// a root context is the sequence of (limited) edges reachable from the root |
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put_edges(&previous, ¤t, EdgeUtils::root_context); |
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assert(previous != NULL, "invariant"); |
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put_chain_epilogue(leak_context_edge, EdgeUtils::root(*previous)); |
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298 |
} |
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299 |
|
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void EdgeStore::put_chain_epilogue(StoredEdge* leak_context_edge, const Edge* root) const { |
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assert(leak_context_edge != NULL, "invariant"); |
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assert(root != NULL, "invariant"); |
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store_gc_root_id_in_leak_context_edge(leak_context_edge, root); |
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assert(leak_context_edge->distance_to_root() + 1 <= EdgeUtils::max_ref_chain_depth, "invariant"); |
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305 |
} |
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306 |
|
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// To avoid another traversal to resolve the root edge id later, |
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// cache it in the immediate leak context edge for fast retrieval. |
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void EdgeStore::store_gc_root_id_in_leak_context_edge(StoredEdge* leak_context_edge, const Edge* root) const { |
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assert(leak_context_edge != NULL, "invariant"); |
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assert(leak_context_edge->gc_root_id() == 0, "invariant"); |
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assert(root != NULL, "invariant"); |
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assert(root->parent() == NULL, "invariant"); |
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assert(root->distance_to_root() == 0, "invariant"); |
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const StoredEdge* const stored_root = static_cast<const StoredEdge*>(root); |
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traceid root_id = stored_root->gc_root_id(); |
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if (root_id == 0) { |
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root_id = get_id(root); |
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stored_root->set_gc_root_id(root_id); |
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} |
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assert(root_id != 0, "invariant"); |
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leak_context_edge->set_gc_root_id(root_id); |
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assert(leak_context_edge->gc_root_id() == stored_root->gc_root_id(), "invariant"); |
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324 |
} |