1 /* 2 * Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_OOPS_METADATA_HPP 26 #define SHARE_OOPS_METADATA_HPP 27 28 #include "utilities/exceptions.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/ostream.hpp" 31 32 // This is the base class for an internal Class related metadata 33 class Metadata : public MetaspaceObj { 34 // Debugging hook to check that the metadata has not been deleted. 35 NOT_PRODUCT(int _valid;) 36 public: Metadata()37 NOT_PRODUCT(Metadata() : _valid(0) {}) 38 NOT_PRODUCT(bool is_valid() const { return _valid == 0; }) 39 40 int identity_hash() { return (int)(uintptr_t)this; } 41 is_metadata() const42 virtual bool is_metadata() const { return true; } is_klass() const43 virtual bool is_klass() const { return false; } is_method() const44 virtual bool is_method() const { return false; } is_methodData() const45 virtual bool is_methodData() const { return false; } is_constantPool() const46 virtual bool is_constantPool() const { return false; } is_methodCounters() const47 virtual bool is_methodCounters() const { return false; } 48 virtual int size() const = 0; 49 virtual MetaspaceObj::Type type() const = 0; 50 virtual const char* internal_name() const = 0; metaspace_pointers_do(MetaspaceClosure * iter)51 virtual void metaspace_pointers_do(MetaspaceClosure* iter) {} 52 53 void print() const; 54 void print_value() const; 55 print_value_on_maybe_null(outputStream * st,const Metadata * m)56 static void print_value_on_maybe_null(outputStream* st, const Metadata* m) { 57 if (NULL == m) 58 st->print("NULL"); 59 else 60 m->print_value_on(st); 61 } 62 63 virtual void print_on(outputStream* st) const; // First level print 64 virtual void print_value_on(outputStream* st) const = 0; // Second level print 65 66 char* print_value_string() const; 67 68 // Used to keep metadata alive during class redefinition 69 // Can't assert because is called for delete functions (as an assert) on_stack() const70 virtual bool on_stack() const { return false; } 71 virtual void set_on_stack(const bool value); 72 73 // Set on_stack bit, so that the metadata is not cleared 74 // during class redefinition. This is a virtual call because only methods 75 // and constant pools need to be set, but someday instanceKlasses might also. mark_on_stack(Metadata * m)76 static void mark_on_stack(Metadata* m) { m->set_on_stack(true); } 77 }; 78 79 #endif // SHARE_OOPS_METADATA_HPP 80