metadata.hpp revision 13370:731370f39fcd
1/* 2 * Copyright (c) 2011, 2014, 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_VM_OOPS_METADATA_HPP 26#define SHARE_VM_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 33class Metadata : public MetaspaceObj { 34 // Debugging hook to check that the metadata has not been deleted. 35 NOT_PRODUCT(int _valid;) 36 public: 37 NOT_PRODUCT(Metadata() { _valid = 0; }) 38 NOT_PRODUCT(bool is_valid() const volatile { return _valid == 0; }) 39 40 int identity_hash() { return (int)(uintptr_t)this; } 41 42 // Rehashing support for tables containing pointers to this 43 unsigned int new_hash(juint seed) { ShouldNotReachHere(); return 0; } 44 45 virtual bool is_metadata() const volatile { return true; } 46 virtual bool is_klass() const volatile { return false; } 47 virtual bool is_method() const volatile { return false; } 48 virtual bool is_methodData() const volatile { return false; } 49 virtual bool is_constantPool() const volatile { return false; } 50 virtual bool is_methodCounters() const volatile { return false; } 51 virtual int size() const = 0; 52 virtual MetaspaceObj::Type type() const = 0; 53 virtual const char* internal_name() const = 0; 54 virtual void metaspace_pointers_do(MetaspaceClosure* iter) {} 55 56 void print() const { print_on(tty); } 57 void print_value() const { print_value_on(tty); } 58 59 void print_maybe_null() const { print_on_maybe_null(tty); } 60 void print_on_maybe_null(outputStream* st) const { 61 if (this == NULL) 62 st->print("NULL"); 63 else 64 print_on(st); 65 } 66 void print_value_on_maybe_null(outputStream* st) const { 67 if (this == NULL) 68 st->print("NULL"); 69 else 70 print_value_on(st); 71 } 72 73 virtual void print_on(outputStream* st) const; // First level print 74 virtual void print_value_on(outputStream* st) const = 0; // Second level print 75 76 char* print_value_string() const; 77 78 // Used to keep metadata alive during class redefinition 79 // Can't assert because is called for delete functions (as an assert) 80 virtual bool on_stack() const { return false; } 81 virtual void set_on_stack(const bool value); 82 83 // Set on_stack bit, so that the metadata is not cleared 84 // during class redefinition. This is a virtual call because only methods 85 // and constant pools need to be set, but someday instanceKlasses might also. 86 static void mark_on_stack(Metadata* m) { m->set_on_stack(true); } 87}; 88 89#endif // SHARE_VM_OOPS_METADATA_HPP 90