1 /* 2 * Copyright (c) 2017, 2018, 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 "oops/weakHandle.hpp" 30 #include "utilities/hashtable.hpp" 31 32 // Hashtable to record Method* used in ResolvedMethods, via. ResolvedMethod oops. 33 // This is needed for redefinition to replace Method* with redefined versions. 34 35 // Entry in a ResolvedMethodTable, mapping a ClassLoaderWeakHandle for a single oop of 36 // java_lang_invoke_ResolvedMethodName which holds JVM Method* in vmtarget. 37 38 class ResolvedMethodEntry : public HashtableEntry<ClassLoaderWeakHandle, mtClass> { 39 public: 40 ResolvedMethodEntry* next() const { 41 return (ResolvedMethodEntry*)HashtableEntry<ClassLoaderWeakHandle, mtClass>::next(); 42 } 43 44 ResolvedMethodEntry** next_addr() { 45 return (ResolvedMethodEntry**)HashtableEntry<ClassLoaderWeakHandle, mtClass>::next_addr(); 46 } 47 48 oop object(); 49 oop object_no_keepalive(); 50 51 void print_on(outputStream* st) const; 52 }; 53 54 class ResolvedMethodTable : public Hashtable<ClassLoaderWeakHandle, mtClass> { 55 enum Constants { 56 _table_size = 1007 57 }; 58 59 static int _oops_removed; 60 static int _oops_counted; 61 62 static bool _dead_entries; 63 64 static ResolvedMethodTable* _the_table; 65 private: 66 ResolvedMethodEntry* bucket(int i) { 67 return (ResolvedMethodEntry*) Hashtable<ClassLoaderWeakHandle, mtClass>::bucket(i); 68 } 69 70 ResolvedMethodEntry** bucket_addr(int i) { 71 return (ResolvedMethodEntry**) Hashtable<ClassLoaderWeakHandle, mtClass>::bucket_addr(i); 72 } 73 74 unsigned int compute_hash(Method* method); 75 76 // need not be locked; no state change 77 oop lookup(int index, unsigned int hash, Method* method); 78 oop lookup(Method* method); 79 80 // must be done under ResolvedMethodTable_lock 81 oop basic_add(Method* method, Handle rmethod_name); 82 83 public: 84 ResolvedMethodTable(); 85 86 static void create_table() { 87 assert(_the_table == NULL, "One symbol table allowed."); 88 _the_table = new ResolvedMethodTable(); 89 } 90 91 // Called from java_lang_invoke_ResolvedMethodName 92 static oop find_method(Method* method); 93 static oop add_method(Handle rmethod_name); 94 95 static bool has_work() { return _dead_entries; } 96 static void trigger_cleanup(); 97 98 #if INCLUDE_JVMTI 99 // It is called at safepoint only for RedefineClasses 100 static void adjust_method_entries(bool * trace_name_printed); 101 #endif // INCLUDE_JVMTI 102 103 // Cleanup cleared entries 104 static void unlink(); 105 106 #ifndef PRODUCT 107 void print(); 108 #endif 109 void verify(); 110 }; 111 112 #endif // SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP