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 33 class 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; }) NOT_PRODUCT(bool is_valid ()const volatile{ return _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 new_hash(juint seed)43 unsigned int new_hash(juint seed) { ShouldNotReachHere(); return 0; } 44 is_metadata() const45 virtual bool is_metadata() const volatile { return true; } is_klass() const46 virtual bool is_klass() const volatile { return false; } is_method() const47 virtual bool is_method() const volatile { return false; } is_methodData() const48 virtual bool is_methodData() const volatile { return false; } is_constantPool() const49 virtual bool is_constantPool() const volatile { return false; } 50 51 virtual const char* internal_name() const = 0; 52 print() const53 void print() const { print_on(tty); } print_value() const54 void print_value() const { print_value_on(tty); } 55 print_maybe_null() const56 void print_maybe_null() const { print_on_maybe_null(tty); } print_on_maybe_null(outputStream * st) const57 void print_on_maybe_null(outputStream* st) const { 58 if (this == NULL) 59 st->print("NULL"); 60 else 61 print_on(tty); 62 } print_value_on_maybe_null(outputStream * st) const63 void print_value_on_maybe_null(outputStream* st) const { 64 if (this == NULL) 65 st->print("NULL"); 66 else 67 print_value_on(tty); 68 } 69 70 virtual void print_on(outputStream* st) const; // First level print 71 virtual void print_value_on(outputStream* st) const = 0; // Second level print 72 73 char* print_value_string() const; 74 75 // Used to keep metadata alive during class redefinition 76 // Can't assert because is called for delete functions (as an assert) on_stack() const77 virtual bool on_stack() const { return false; } 78 virtual void set_on_stack(const bool value); 79 80 // Set on_stack bit, so that the metadata is not cleared 81 // during class redefinition. This is a virtual call because only methods 82 // and constant pools need to be set, but someday instanceKlasses might also. mark_on_stack(Metadata * m)83 static void mark_on_stack(Metadata* m) { m->set_on_stack(true); } 84 }; 85 86 #endif // SHARE_VM_OOPS_METADATA_HPP 87