1 /* 2 * Copyright (c) 1999, 2012, 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_CI_CIINSTANCEKLASS_HPP 26 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP 27 28 #include "ci/ciConstantPoolCache.hpp" 29 #include "ci/ciFlags.hpp" 30 #include "ci/ciKlass.hpp" 31 #include "ci/ciSymbol.hpp" 32 33 // ciInstanceKlass 34 // 35 // This class represents a Klass* in the HotSpot virtual machine 36 // whose Klass part is an InstanceKlass. It may or may not 37 // be loaded. 38 class ciInstanceKlass : public ciKlass { 39 CI_PACKAGE_ACCESS 40 friend class ciBytecodeStream; 41 friend class ciEnv; 42 friend class ciExceptionHandler; 43 friend class ciMethod; 44 friend class ciField; 45 46 private: 47 jobject _loader; 48 jobject _protection_domain; 49 50 InstanceKlass::ClassState _init_state; // state of class 51 bool _is_shared; 52 bool _has_finalizer; 53 bool _has_subklass; 54 bool _has_nonstatic_fields; 55 56 ciFlags _flags; 57 jint _nonstatic_field_size; 58 jint _nonstatic_oop_map_size; 59 60 // Lazy fields get filled in only upon request. 61 ciInstanceKlass* _super; 62 ciInstance* _java_mirror; 63 64 ciConstantPoolCache* _field_cache; // cached map index->field 65 GrowableArray<ciField*>* _nonstatic_fields; 66 67 // The possible values of the _implementor fall into following three cases: 68 // NULL: no implementor. 69 // A ciInstanceKlass that's not itself: one implementor. 70 // Itsef: more than one implementors. 71 ciInstanceKlass* _implementor; 72 73 GrowableArray<ciField*>* _non_static_fields; 74 75 protected: 76 ciInstanceKlass(KlassHandle h_k); 77 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain); 78 79 InstanceKlass* get_instanceKlass() const { 80 return (InstanceKlass*)get_Klass(); 81 } 82 83 oop loader(); 84 jobject loader_handle(); 85 86 oop protection_domain(); 87 jobject protection_domain_handle(); 88 89 const char* type_string() { return "ciInstanceKlass"; } 90 91 bool is_in_package_impl(const char* packagename, int len); 92 93 void print_impl(outputStream* st); 94 95 ciConstantPoolCache* field_cache(); 96 97 bool is_shared() { return _is_shared; } 98 99 void compute_shared_init_state(); 100 bool compute_shared_has_subklass(); 101 int compute_nonstatic_fields(); 102 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields); 103 104 // Update the init_state for shared klasses 105 void update_if_shared(InstanceKlass::ClassState expected) { 106 if (_is_shared && _init_state != expected) { 107 if (is_loaded()) compute_shared_init_state(); 108 } 109 } 110 111 public: 112 // Has this klass been initialized? 113 bool is_initialized() { 114 update_if_shared(InstanceKlass::fully_initialized); 115 return _init_state == InstanceKlass::fully_initialized; 116 } 117 // Is this klass being initialized? 118 bool is_being_initialized() { 119 update_if_shared(InstanceKlass::being_initialized); 120 return _init_state == InstanceKlass::being_initialized; 121 } 122 // Has this klass been linked? 123 bool is_linked() { 124 update_if_shared(InstanceKlass::linked); 125 return _init_state >= InstanceKlass::linked; 126 } 127 128 // General klass information. 129 ciFlags flags() { 130 assert(is_loaded(), "must be loaded"); 131 return _flags; 132 } 133 bool has_finalizer() { 134 assert(is_loaded(), "must be loaded"); 135 return _has_finalizer; } 136 bool has_subklass() { 137 assert(is_loaded(), "must be loaded"); 138 if (_is_shared && !_has_subklass) { 139 if (flags().is_final()) { 140 return false; 141 } else { 142 return compute_shared_has_subklass(); 143 } 144 } 145 return _has_subklass; 146 } 147 jint size_helper() { 148 return (Klass::layout_helper_size_in_bytes(layout_helper()) 149 >> LogHeapWordSize); 150 } 151 jint nonstatic_field_size() { 152 assert(is_loaded(), "must be loaded"); 153 return _nonstatic_field_size; } 154 jint has_nonstatic_fields() { 155 assert(is_loaded(), "must be loaded"); 156 return _has_nonstatic_fields; } 157 jint nonstatic_oop_map_size() { 158 assert(is_loaded(), "must be loaded"); 159 return _nonstatic_oop_map_size; } 160 ciInstanceKlass* super(); 161 jint nof_implementors() { 162 ciInstanceKlass* impl; 163 assert(is_loaded(), "must be loaded"); 164 impl = implementor(); 165 if (impl == NULL) { 166 return 0; 167 } else if (impl != this) { 168 return 1; 169 } else { 170 return 2; 171 } 172 } 173 174 ciInstanceKlass* get_canonical_holder(int offset); 175 ciField* get_field_by_offset(int field_offset, bool is_static); 176 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static); 177 178 GrowableArray<ciField*>* non_static_fields(); 179 180 // total number of nonstatic fields (including inherited): 181 int nof_nonstatic_fields() { 182 if (_nonstatic_fields == NULL) 183 return compute_nonstatic_fields(); 184 else 185 return _nonstatic_fields->length(); 186 } 187 // nth nonstatic field (presented by ascending address) 188 ciField* nonstatic_field_at(int i) { 189 assert(_nonstatic_fields != NULL, ""); 190 return _nonstatic_fields->at(i); 191 } 192 193 ciInstanceKlass* unique_concrete_subklass(); 194 bool has_finalizable_subclass(); 195 196 bool contains_field_offset(int offset) { 197 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 198 } 199 200 // Get the instance of java.lang.Class corresponding to 201 // this klass. This instance is used for locking of 202 // synchronized static methods of this klass. 203 ciInstance* java_mirror(); 204 205 // Java access flags 206 bool is_public () { return flags().is_public(); } 207 bool is_final () { return flags().is_final(); } 208 bool is_super () { return flags().is_super(); } 209 bool is_interface () { return flags().is_interface(); } 210 bool is_abstract () { return flags().is_abstract(); } 211 212 ciMethod* find_method(ciSymbol* name, ciSymbol* signature); 213 // Note: To find a method from name and type strings, use ciSymbol::make, 214 // but consider adding to vmSymbols.hpp instead. 215 216 bool is_leaf_type(); 217 ciInstanceKlass* implementor(); 218 219 // Is the defining class loader of this class the default loader? 220 bool uses_default_loader() const; 221 222 bool is_java_lang_Object() const; 223 224 BasicType box_klass_type() const; 225 bool is_box_klass() const; 226 bool is_boxed_value_offset(int offset) const; 227 228 // Is this klass in the given package? 229 bool is_in_package(const char* packagename) { 230 return is_in_package(packagename, (int) strlen(packagename)); 231 } 232 bool is_in_package(const char* packagename, int len); 233 234 // What kind of ciObject is this? 235 bool is_instance_klass() const { return true; } 236 bool is_java_klass() const { return true; } 237 238 // Dump the current state of this klass for compilation replay. 239 virtual void dump_replay_data(outputStream* out); 240 }; 241 242 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP