1 /* 2 * Copyright (c) 1999, 2010, 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 "precompiled.hpp" 26 #include "ci/ciKlass.hpp" 27 #include "ci/ciSymbol.hpp" 28 #include "ci/ciUtilities.hpp" 29 #include "oops/oop.inline.hpp" 30 31 // ciKlass 32 // 33 // This class represents a klassOop in the HotSpot virtual 34 // machine. 35 36 // ------------------------------------------------------------------ 37 // ciKlass::ciKlass 38 ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) { 39 assert(get_oop()->is_klass(), "wrong type"); 40 Klass* k = get_Klass(); 41 _layout_helper = k->layout_helper(); 42 symbolOop klass_name = k->name(); 43 assert(klass_name != NULL, "wrong ciKlass constructor"); 44 _name = CURRENT_ENV->get_object(klass_name)->as_symbol(); 45 } 46 47 // ------------------------------------------------------------------ 48 // ciKlass::ciKlass 49 // 50 // Nameless klass variant. 51 ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) { 52 assert(get_oop()->is_klass(), "wrong type"); 53 _name = name; 54 _layout_helper = Klass::_lh_neutral_value; 55 } 56 57 // ------------------------------------------------------------------ 58 // ciKlass::ciKlass 59 // 60 // Unloaded klass variant. 61 ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) { 62 _name = name; 63 _layout_helper = Klass::_lh_neutral_value; 64 } 65 66 // ------------------------------------------------------------------ 67 // ciKlass::is_subtype_of 68 bool ciKlass::is_subtype_of(ciKlass* that) { 69 assert(is_loaded() && that->is_loaded(), "must be loaded"); 70 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 71 // Check to see if the klasses are identical. 72 if (this == that) { 73 return true; 74 } 75 76 VM_ENTRY_MARK; 77 Klass* this_klass = get_Klass(); 78 klassOop that_klass = that->get_klassOop(); 79 bool result = this_klass->is_subtype_of(that_klass); 80 81 return result; 82 } 83 84 // ------------------------------------------------------------------ 85 // ciKlass::is_subclass_of 86 bool ciKlass::is_subclass_of(ciKlass* that) { 87 assert(is_loaded() && that->is_loaded(), "must be loaded"); 88 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 89 // Check to see if the klasses are identical. 90 91 VM_ENTRY_MARK; 92 Klass* this_klass = get_Klass(); 93 klassOop that_klass = that->get_klassOop(); 94 bool result = this_klass->is_subclass_of(that_klass); 95 96 return result; 97 } 98 99 // ------------------------------------------------------------------ 100 // ciKlass::super_depth 101 juint ciKlass::super_depth() { 102 assert(is_loaded(), "must be loaded"); 103 assert(is_java_klass(), "must be java klasses"); 104 105 VM_ENTRY_MARK; 106 Klass* this_klass = get_Klass(); 107 return this_klass->super_depth(); 108 } 109 110 // ------------------------------------------------------------------ 111 // ciKlass::super_check_offset 112 juint ciKlass::super_check_offset() { 113 assert(is_loaded(), "must be loaded"); 114 assert(is_java_klass(), "must be java klasses"); 115 116 VM_ENTRY_MARK; 117 Klass* this_klass = get_Klass(); 118 return this_klass->super_check_offset(); 119 } 120 121 // ------------------------------------------------------------------ 122 // ciKlass::super_of_depth 123 ciKlass* ciKlass::super_of_depth(juint i) { 124 assert(is_loaded(), "must be loaded"); 125 assert(is_java_klass(), "must be java klasses"); 126 127 VM_ENTRY_MARK; 128 Klass* this_klass = get_Klass(); 129 klassOop super = this_klass->primary_super_of_depth(i); 130 return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL; 131 } 132 133 // ------------------------------------------------------------------ 134 // ciKlass::can_be_primary_super 135 bool ciKlass::can_be_primary_super() { 136 assert(is_loaded(), "must be loaded"); 137 assert(is_java_klass(), "must be java klasses"); 138 139 VM_ENTRY_MARK; 140 Klass* this_klass = get_Klass(); 141 return this_klass->can_be_primary_super(); 142 } 143 144 // ------------------------------------------------------------------ 145 // ciKlass::least_common_ancestor 146 // 147 // Get the shared parent of two klasses. 148 // 149 // Implementation note: this method currently goes "over the wall" 150 // and does all of the work on the VM side. It could be rewritten 151 // to use the super() method and do all of the work (aside from the 152 // lazy computation of super()) in native mode. This may be 153 // worthwhile if the compiler is repeatedly requesting the same lca 154 // computation or possibly if most of the superklasses have already 155 // been created as ciObjects anyway. Something to think about... 156 ciKlass* 157 ciKlass::least_common_ancestor(ciKlass* that) { 158 assert(is_loaded() && that->is_loaded(), "must be loaded"); 159 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 160 // Check to see if the klasses are identical. 161 if (this == that) { 162 return this; 163 } 164 165 VM_ENTRY_MARK; 166 Klass* this_klass = get_Klass(); 167 Klass* that_klass = that->get_Klass(); 168 Klass* lca = this_klass->LCA(that_klass); 169 170 // Many times the LCA will be either this_klass or that_klass. 171 // Treat these as special cases. 172 if (lca == that_klass) { 173 return that; 174 } 175 if (this_klass == lca) { 176 return this; 177 } 178 179 // Create the ciInstanceKlass for the lca. 180 ciKlass* result = 181 CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass(); 182 183 return result; 184 } 185 186 // ------------------------------------------------------------------ 187 // ciKlass::find_klass 188 // 189 // Find a klass using this klass's class loader. 190 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) { 191 assert(is_loaded(), "cannot find_klass through an unloaded klass"); 192 return CURRENT_ENV->get_klass_by_name(this, 193 klass_name, false); 194 } 195 196 // ------------------------------------------------------------------ 197 // ciKlass::java_mirror 198 // 199 // Get the instance of java.lang.Class corresponding to this klass. 200 // If it is an unloaded instance or array klass, return an unloaded 201 // mirror object of type Class. 202 ciInstance* ciKlass::java_mirror() { 203 GUARDED_VM_ENTRY( 204 if (!is_loaded()) 205 return ciEnv::current()->get_unloaded_klass_mirror(this); 206 oop java_mirror = get_Klass()->java_mirror(); 207 return CURRENT_ENV->get_object(java_mirror)->as_instance(); 208 ) 209 } 210 211 // ------------------------------------------------------------------ 212 // ciKlass::modifier_flags 213 jint ciKlass::modifier_flags() { 214 assert(is_loaded(), "not loaded"); 215 GUARDED_VM_ENTRY( 216 return get_Klass()->modifier_flags(); 217 ) 218 } 219 220 // ------------------------------------------------------------------ 221 // ciKlass::access_flags 222 jint ciKlass::access_flags() { 223 assert(is_loaded(), "not loaded"); 224 GUARDED_VM_ENTRY( 225 return get_Klass()->access_flags().as_int(); 226 ) 227 } 228 229 // ------------------------------------------------------------------ 230 // ciKlass::print_impl 231 // 232 // Implementation of the print method 233 void ciKlass::print_impl(outputStream* st) { 234 st->print(" name="); 235 print_name_on(st); 236 } 237 238 // ------------------------------------------------------------------ 239 // ciKlass::print_name 240 // 241 // Print the name of this klass 242 void ciKlass::print_name_on(outputStream* st) { 243 name()->print_symbol_on(st); 244 }