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view src/share/vm/memory/classify.hpp @ 3293:1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
Summary: In G1 heap verification, we no longer scan perm to G1-collected heap refs as part of process_strong_roots() but rather in a separate explicit oop iteration over the perm gen. This preserves the original perm card-marks. Added a new assertion in younger_refs_iterate() to catch a simple subcase where the user may have forgotten a prior save_marks() call, as happened in the case of G1's attempt to iterate perm to G1 refs when verifying the heap before exit. The assert was deliberately weakened for ParNew+CMS and will be fixed for that combination in a future CR. Also made some (non-G1) cleanups related to code and comments obsoleted by the migration of Symbols to the native heap.
Reviewed-by: iveresov, jmasa, tonyp
author | ysr |
---|---|
date | Tue, 26 Apr 2011 21:17:24 -0700 |
parents | f95d63e2154a |
children |
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/* * Copyright (c) 2003, 2010, 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_MEMORY_CLASSIFY_HPP #define SHARE_VM_MEMORY_CLASSIFY_HPP #include "oops/oop.inline.hpp" typedef enum oop_type { unknown_type, instance_type, instanceRef_type, objArray_type, symbol_type, klass_type, instanceKlass_type, method_type, constMethod_type, methodData_type, constantPool_type, constantPoolCache_type, typeArray_type, compiledICHolder_type, number_object_types } object_type; // Classify objects by type and keep counts. // Print the count and space taken for each type. class ClassifyObjectClosure : public ObjectClosure { private: static const char* object_type_name[number_object_types]; int total_object_count; size_t total_object_size; int object_count[number_object_types]; size_t object_size[number_object_types]; public: ClassifyObjectClosure() { reset(); } void reset(); void do_object(oop obj); static object_type classify_object(oop obj, bool count); size_t print(); }; // Count objects using the alloc_count field in the object's klass // object. class ClassifyInstanceKlassClosure : public ClassifyObjectClosure { private: int total_instances; public: ClassifyInstanceKlassClosure() { reset(); } void reset(); void print(); void do_object(oop obj); }; // Clear the alloc_count fields in all classes so that the count can be // restarted. class ClearAllocCountClosure : public ObjectClosure { public: void do_object(oop obj) { if (obj->is_klass()) { Klass* k = Klass::cast((klassOop)obj); k->set_alloc_count(0); } } }; #endif // SHARE_VM_MEMORY_CLASSIFY_HPP