1 /* 2 * Copyright (c) 2003, 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_CLASSFILE_LOADERCONSTRAINTS_HPP 26 #define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP 27 28 #include "classfile/placeholders.hpp" 29 #include "utilities/hashtable.hpp" 30 31 class ClassLoaderData; 32 class LoaderConstraintEntry; 33 class Symbol; 34 35 class LoaderConstraintTable : public Hashtable<InstanceKlass*, mtClass> { 36 37 private: 38 LoaderConstraintEntry** find_loader_constraint(Symbol* name, 39 Handle loader); 40 41 public: 42 43 LoaderConstraintTable(int table_size); 44 45 LoaderConstraintEntry* new_entry(unsigned int hash, Symbol* name, 46 InstanceKlass* klass, int num_loaders, 47 int max_loaders); 48 void free_entry(LoaderConstraintEntry *entry); 49 bucket(int i) const50 LoaderConstraintEntry* bucket(int i) const { 51 return (LoaderConstraintEntry*)Hashtable<InstanceKlass*, mtClass>::bucket(i); 52 } 53 bucket_addr(int i)54 LoaderConstraintEntry** bucket_addr(int i) { 55 return (LoaderConstraintEntry**)Hashtable<InstanceKlass*, mtClass>::bucket_addr(i); 56 } 57 58 // Check class loader constraints 59 bool add_entry(Symbol* name, InstanceKlass* klass1, Handle loader1, 60 InstanceKlass* klass2, Handle loader2); 61 62 // Note: The main entry point for this module is via SystemDictionary. 63 // SystemDictionary::check_signature_loaders(Symbol* signature, 64 // Handle loader1, Handle loader2, 65 // bool is_method, TRAPS) 66 67 InstanceKlass* find_constrained_klass(Symbol* name, Handle loader); 68 69 // Class loader constraints 70 71 void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree); 72 void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader, 73 InstanceKlass* klass); 74 void merge_loader_constraints(LoaderConstraintEntry** pp1, 75 LoaderConstraintEntry** pp2, InstanceKlass* klass); 76 77 bool check_or_update(InstanceKlass* k, Handle loader, Symbol* name); 78 79 void purge_loader_constraints(); 80 81 void verify(PlaceholderTable* placeholders); 82 void print_on(outputStream* st) const; 83 }; 84 85 class LoaderConstraintEntry : public HashtableEntry<InstanceKlass*, mtClass> { 86 private: 87 Symbol* _name; // class name 88 int _num_loaders; 89 int _max_loaders; 90 // Loader constraints enforce correct linking behavior. 91 // Thus, it really operates on ClassLoaderData which represents linking domain, 92 // not class loaders. 93 ClassLoaderData** _loaders; // initiating loaders 94 95 public: 96 klass()97 InstanceKlass* klass() { return literal(); } klass_addr()98 InstanceKlass** klass_addr() { return literal_addr(); } set_klass(InstanceKlass * k)99 void set_klass(InstanceKlass* k) { set_literal(k); } 100 next()101 LoaderConstraintEntry* next() { 102 return (LoaderConstraintEntry*)HashtableEntry<InstanceKlass*, mtClass>::next(); 103 } 104 next_addr()105 LoaderConstraintEntry** next_addr() { 106 return (LoaderConstraintEntry**)HashtableEntry<InstanceKlass*, mtClass>::next_addr(); 107 } set_next(LoaderConstraintEntry * next)108 void set_next(LoaderConstraintEntry* next) { 109 HashtableEntry<InstanceKlass*, mtClass>::set_next(next); 110 } 111 name()112 Symbol* name() { return _name; } set_name(Symbol * name)113 void set_name(Symbol* name) { 114 _name = name; 115 if (name != NULL) name->increment_refcount(); 116 } 117 num_loaders()118 int num_loaders() { return _num_loaders; } set_num_loaders(int i)119 void set_num_loaders(int i) { _num_loaders = i; } 120 max_loaders()121 int max_loaders() { return _max_loaders; } set_max_loaders(int i)122 void set_max_loaders(int i) { _max_loaders = i; } 123 loaders()124 ClassLoaderData** loaders() { return _loaders; } set_loaders(ClassLoaderData ** loaders)125 void set_loaders(ClassLoaderData** loaders) { _loaders = loaders; } 126 loader_data(int i)127 ClassLoaderData* loader_data(int i) { return _loaders[i]; } set_loader_data(int i,ClassLoaderData * p)128 void set_loader_data(int i, ClassLoaderData* p) { _loaders[i] = p; } 129 // convenience 130 void set_loader(int i, oop p); 131 }; 132 133 #endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP 134