1 /* 2 * Copyright (c) 2005, 2019, 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_CLASSFILE_RESOLUTIONERRORS_HPP 26 #define SHARE_CLASSFILE_RESOLUTIONERRORS_HPP 27 28 #include "oops/constantPool.hpp" 29 #include "utilities/hashtable.hpp" 30 31 class ResolutionErrorEntry; 32 33 // ResolutionError objects are used to record errors encountered during 34 // constant pool resolution (JVMS 5.4.3). 35 36 // This value is added to the cpCache index of an invokedynamic instruction when 37 // storing the resolution error resulting from that invokedynamic instruction. 38 // This prevents issues where the cpCache index is the same as the constant pool 39 // index of another entry in the table. 40 const int CPCACHE_INDEX_MANGLE_VALUE = 1000000; 41 42 class ResolutionErrorTable : public Hashtable<ConstantPool*, mtClass> { 43 44 public: 45 ResolutionErrorTable(int table_size); 46 47 ResolutionErrorEntry* new_entry(int hash, ConstantPool* pool, int cp_index, 48 Symbol* error, Symbol* message); 49 void free_entry(ResolutionErrorEntry *entry); 50 51 ResolutionErrorEntry* bucket(int i) { 52 return (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::bucket(i); 53 } 54 55 ResolutionErrorEntry** bucket_addr(int i) { 56 return (ResolutionErrorEntry**)Hashtable<ConstantPool*, mtClass>::bucket_addr(i); 57 } 58 59 void add_entry(int index, ResolutionErrorEntry* new_entry) { 60 Hashtable<ConstantPool*, mtClass>::add_entry(index, 61 (HashtableEntry<ConstantPool*, mtClass>*)new_entry); 62 } 63 64 void add_entry(int index, unsigned int hash, 65 const constantPoolHandle& pool, int which, Symbol* error, Symbol* message); 66 67 68 // find error given the constant pool and constant pool index 69 ResolutionErrorEntry* find_entry(int index, unsigned int hash, 70 const constantPoolHandle& pool, int cp_index); 71 72 73 unsigned int compute_hash(const constantPoolHandle& pool, int cp_index) { 74 return (unsigned int) pool->identity_hash() + cp_index; 75 } 76 77 // purges unloaded entries from the table 78 void purge_resolution_errors(); 79 80 // RedefineClasses support - remove obsolete constant pool entry 81 void delete_entry(ConstantPool* c); 82 83 // This function is used to encode an index to differentiate it from a 84 // constant pool index. It assumes it is being called with a cpCache index 85 // (that is less than 0). 86 static int encode_cpcache_index(int index) { 87 assert(index < 0, "Unexpected non-negative cpCache index"); 88 return index + CPCACHE_INDEX_MANGLE_VALUE; 89 } 90 }; 91 92 93 class ResolutionErrorEntry : public HashtableEntry<ConstantPool*, mtClass> { 94 private: 95 int _cp_index; 96 Symbol* _error; 97 Symbol* _message; 98 99 public: 100 ConstantPool* pool() const { return literal(); } 101 102 int cp_index() const { return _cp_index; } 103 void set_cp_index(int cp_index) { _cp_index = cp_index; } 104 105 Symbol* error() const { return _error; } 106 void set_error(Symbol* e); 107 108 Symbol* message() const { return _message; } 109 void set_message(Symbol* c); 110 111 ResolutionErrorEntry* next() const { 112 return (ResolutionErrorEntry*)HashtableEntry<ConstantPool*, mtClass>::next(); 113 } 114 115 ResolutionErrorEntry** next_addr() { 116 return (ResolutionErrorEntry**)HashtableEntry<ConstantPool*, mtClass>::next_addr(); 117 } 118 }; 119 120 #endif // SHARE_CLASSFILE_RESOLUTIONERRORS_HPP