1 /* 2 * Copyright (c) 1999, 2009, 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 #include "incls/_precompiled.incl" 26 #include "incls/_ciKlass.cpp.incl" 27 28 // ciKlass 29 // 30 // This class represents a klassOop in the HotSpot virtual 31 // machine. 32 33 // ------------------------------------------------------------------ 34 // ciKlass::ciKlass 35 ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) { 36 assert(get_oop()->is_klass(), "wrong type"); 37 Klass* k = get_Klass(); 38 _layout_helper = k->layout_helper(); 39 symbolOop klass_name = k->name(); 40 assert(klass_name != NULL, "wrong ciKlass constructor"); 41 _name = CURRENT_ENV->get_object(klass_name)->as_symbol(); 42 } 43 44 // ------------------------------------------------------------------ 45 // ciKlass::ciKlass 46 // 47 // Nameless klass variant. 48 ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) { 49 assert(get_oop()->is_klass(), "wrong type"); 50 _name = name; 51 _layout_helper = Klass::_lh_neutral_value; 52 } 53 54 // ------------------------------------------------------------------ 55 // ciKlass::ciKlass 56 // 57 // Unloaded klass variant. 58 ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) { 59 _name = name; 60 _layout_helper = Klass::_lh_neutral_value; 61 } 62 63 // ------------------------------------------------------------------ 64 // ciKlass::is_subtype_of 65 bool ciKlass::is_subtype_of(ciKlass* that) { 66 assert(is_loaded() && that->is_loaded(), "must be loaded"); 67 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 68 // Check to see if the klasses are identical. 69 if (this == that) { 70 return true; 71 } 72 73 VM_ENTRY_MARK; 74 Klass* this_klass = get_Klass(); 75 klassOop that_klass = that->get_klassOop(); 76 bool result = this_klass->is_subtype_of(that_klass); 77 78 return result; 79 } 80 81 // ------------------------------------------------------------------ 82 // ciKlass::is_subclass_of 83 bool ciKlass::is_subclass_of(ciKlass* that) { 84 assert(is_loaded() && that->is_loaded(), "must be loaded"); 85 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 86 // Check to see if the klasses are identical. 87 88 VM_ENTRY_MARK; 89 Klass* this_klass = get_Klass(); 90 klassOop that_klass = that->get_klassOop(); 91 bool result = this_klass->is_subclass_of(that_klass); 92 93 return result; 94 } 95 96 // ------------------------------------------------------------------ 97 // ciKlass::super_depth 98 juint ciKlass::super_depth() { 99 assert(is_loaded(), "must be loaded"); 100 assert(is_java_klass(), "must be java klasses"); 101 102 VM_ENTRY_MARK; 103 Klass* this_klass = get_Klass(); 104 return this_klass->super_depth(); 105 } 106 107 // ------------------------------------------------------------------ 108 // ciKlass::super_check_offset 109 juint ciKlass::super_check_offset() { 110 assert(is_loaded(), "must be loaded"); 111 assert(is_java_klass(), "must be java klasses"); 112 113 VM_ENTRY_MARK; 114 Klass* this_klass = get_Klass(); 115 return this_klass->super_check_offset(); 116 } 117 118 // ------------------------------------------------------------------ 119 // ciKlass::super_of_depth 120 ciKlass* ciKlass::super_of_depth(juint i) { 121 assert(is_loaded(), "must be loaded"); 122 assert(is_java_klass(), "must be java klasses"); 123 124 VM_ENTRY_MARK; 125 Klass* this_klass = get_Klass(); 126 klassOop super = this_klass->primary_super_of_depth(i); 127 return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL; 128 } 129 130 // ------------------------------------------------------------------ 131 // ciKlass::can_be_primary_super 132 bool ciKlass::can_be_primary_super() { 133 assert(is_loaded(), "must be loaded"); 134 assert(is_java_klass(), "must be java klasses"); 135 136 VM_ENTRY_MARK; 137 Klass* this_klass = get_Klass(); 138 return this_klass->can_be_primary_super(); 139 } 140 141 // ------------------------------------------------------------------ 142 // ciKlass::least_common_ancestor 143 // 144 // Get the shared parent of two klasses. 145 // 146 // Implementation note: this method currently goes "over the wall" 147 // and does all of the work on the VM side. It could be rewritten 148 // to use the super() method and do all of the work (aside from the 149 // lazy computation of super()) in native mode. This may be 150 // worthwhile if the compiler is repeatedly requesting the same lca 151 // computation or possibly if most of the superklasses have already 152 // been created as ciObjects anyway. Something to think about... 153 ciKlass* 154 ciKlass::least_common_ancestor(ciKlass* that) { 155 assert(is_loaded() && that->is_loaded(), "must be loaded"); 156 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 157 // Check to see if the klasses are identical. 158 if (this == that) { 159 return this; 160 } 161 162 VM_ENTRY_MARK; 163 Klass* this_klass = get_Klass(); 164 Klass* that_klass = that->get_Klass(); 165 Klass* lca = this_klass->LCA(that_klass); 166 167 // Many times the LCA will be either this_klass or that_klass. 168 // Treat these as special cases. 169 if (lca == that_klass) { 170 return that; 171 } 172 if (this_klass == lca) { 173 return this; 174 } 175 176 // Create the ciInstanceKlass for the lca. 177 ciKlass* result = 178 CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass(); 179 180 return result; 181 } 182 183 // ------------------------------------------------------------------ 184 // ciKlass::find_klass 185 // 186 // Find a klass using this klass's class loader. 187 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) { 188 assert(is_loaded(), "cannot find_klass through an unloaded klass"); 189 return CURRENT_ENV->get_klass_by_name(this, 190 klass_name, false); 191 } 192 193 // ------------------------------------------------------------------ 194 // ciKlass::java_mirror 195 // 196 // Get the instance of java.lang.Class corresponding to this klass. 197 // If it is an unloaded instance or array klass, return an unloaded 198 // mirror object of type Class. 199 ciInstance* ciKlass::java_mirror() { 200 GUARDED_VM_ENTRY( 201 if (!is_loaded()) 202 return ciEnv::current()->get_unloaded_klass_mirror(this); 203 oop java_mirror = get_Klass()->java_mirror(); 204 return CURRENT_ENV->get_object(java_mirror)->as_instance(); 205 ) 206 } 207 208 // ------------------------------------------------------------------ 209 // ciKlass::modifier_flags 210 jint ciKlass::modifier_flags() { 211 assert(is_loaded(), "not loaded"); 212 GUARDED_VM_ENTRY( 213 return get_Klass()->modifier_flags(); 214 ) 215 } 216 217 // ------------------------------------------------------------------ 218 // ciKlass::access_flags 219 jint ciKlass::access_flags() { 220 assert(is_loaded(), "not loaded"); 221 GUARDED_VM_ENTRY( 222 return get_Klass()->access_flags().as_int(); 223 ) 224 } 225 226 // ------------------------------------------------------------------ 227 // ciKlass::print_impl 228 // 229 // Implementation of the print method 230 void ciKlass::print_impl(outputStream* st) { 231 st->print(" name="); 232 print_name_on(st); 233 } 234 235 // ------------------------------------------------------------------ 236 // ciKlass::print_name 237 // 238 // Print the name of this klass 239 void ciKlass::print_name_on(outputStream* st) { 240 name()->print_symbol_on(st); 241 }