1/* 2 * Copyright (c) 2017, 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_PRIMS_RESOLVEDMETHOD_HPP 26#define SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP 27 28#include "oops/symbol.hpp" 29#include "utilities/hashtable.hpp" 30 31// Hashtable to record Method* used in ResolvedMethods, via. ResolvedMethod oops. 32// This is needed for redefinition to replace Method* with redefined versions. 33 34// Entry in a ResolvedMethodTable, mapping a single oop of java_lang_invoke_ResolvedMethodName which 35// holds JVM Method* in vmtarget. 36 37class ResolvedMethodEntry : public HashtableEntry<oop, mtClass> { 38 public: 39 ResolvedMethodEntry* next() const { 40 return (ResolvedMethodEntry*)HashtableEntry<oop, mtClass>::next(); 41 } 42 43 ResolvedMethodEntry** next_addr() { 44 return (ResolvedMethodEntry**)HashtableEntry<oop, mtClass>::next_addr(); 45 } 46 47 void print_on(outputStream* st) const; 48}; 49 50class ResolvedMethodTable : public Hashtable<oop, mtClass> { 51 enum Constants { 52 _table_size = 1007 53 }; 54 55 static int _oops_removed; 56 static int _oops_counted; 57 58 static ResolvedMethodTable* _the_table; 59private: 60 ResolvedMethodEntry* bucket(int i) { 61 return (ResolvedMethodEntry*) Hashtable<oop, mtClass>::bucket(i); 62 } 63 64 ResolvedMethodEntry** bucket_addr(int i) { 65 return (ResolvedMethodEntry**) Hashtable<oop, mtClass>::bucket_addr(i); 66 } 67 68 unsigned int compute_hash(Method* method); 69 70 // need not be locked; no state change 71 oop lookup(int index, unsigned int hash, Method* method); 72 oop lookup(Method* method); 73 74 // must be done under ResolvedMethodTable_lock 75 oop basic_add(Method* method, oop rmethod_name); 76 77public: 78 ResolvedMethodTable(); 79 80 static void create_table() { 81 assert(_the_table == NULL, "One symbol table allowed."); 82 _the_table = new ResolvedMethodTable(); 83 } 84 85 // Called from java_lang_invoke_ResolvedMethodName 86 static oop find_method(Method* method); 87 static oop add_method(Handle rmethod_name); 88 89#if INCLUDE_JVMTI 90 // It is called at safepoint only for RedefineClasses 91 static void adjust_method_entries(bool * trace_name_printed); 92#endif // INCLUDE_JVMTI 93 94 // Cleanup cleared entries 95 static void unlink(BoolObjectClosure* is_alive); 96 static void oops_do(OopClosure* f); 97 98#ifndef PRODUCT 99 void print(); 100#endif 101 void verify(); 102}; 103 104#endif // SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP 105