67 lines
3.6 KiB
Plaintext
67 lines
3.6 KiB
Plaintext
/*
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* Copyright (c) 2016, 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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The test checks that after different type of GC unreachable objects behave as expected:
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1. Young GC - weakly referenced non-humongous objects are collected, other objects are not collected.
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2. Full GC - weakly referenced non-humongous and humongous objects are collected, softly referenced non-humongous and
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humongous objects are not collected.
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3. Full GC with memory pressure - weakly and softly referenced non-humongous and humongous objects are collected.
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4. CMC - weakly referenced non-humongous objects are collected, other objects are not collected since weak references
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from Young Gen is handled as strong during CMC.
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5. CMC_NO_SURV_ROOTS - weakly referenced non-humongous and humongous objects are collected, softly referenced
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non-humongous and humongous objects are not collected since we make 2 Young GC to promote all
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weak references to Old Gen.
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6. Mixed GC - weakly referenced non-humongous and humongous objects are collected, softly referenced non-humongous and
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humongous objects are not collected.
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The test gets gc type as a command line argument.
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Then the test allocates object graph in heap (currently testing scenarios are pre-generated and stored in
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TestcaseData.getPregeneratedTestcases()) with TestObjectGraphAfterGC::allocateObjectGraph.
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Since we are testing humongous objects we need pretty unusual nodes - arrays of Object.
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We need this since only large enough array could be Humongous object (in fact class with huge amount of fields is
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humongous too but it's for other tests).
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ObjectGraph class generates object graph with Object[] nodes. It also provides a way to collect
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information about each node using "visitor" pattern.
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Using visitors we build Set of ReferenceInfo instances which contains the following information:
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reference - external weak/soft reference to graph's node
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graphId and nodeId - graph's and node's ids - we need this for error handling
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softlyReachable - is node effectively referenced by external soft reference. It could be when external
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soft reference or when this node is reachable from node that exteranally referenced by soft reference
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effectiveHumongous - if node behaves effectively humongous. It could be when node is humongous
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or when this node is reachable from humongous node.
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When we leave TestObjectGraphAfterGC::allocateObjectGraph we make graph reachable only with references from Set of
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ReferenceInfo instances.
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We run specified gc and check that each instance of ReferenceInfo set behaves as expected.
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Then we check that gc log file contains expected tokens and doesn't contain tokens that it should not contain.
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