1 /* 2 * Copyright (c) 1999, 2013, 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 Klass* in the HotSpot virtual 34 // machine. 35 36 // ------------------------------------------------------------------ 37 // ciKlass::ciKlass 38 ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) { 39 assert(get_Klass()->is_klass(), "wrong type"); 40 Klass* k = get_Klass(); 41 _layout_helper = k->layout_helper(); 42 Symbol* klass_name = k->name(); 43 assert(klass_name != NULL, "wrong ciKlass constructor"); 44 _name = CURRENT_ENV->get_symbol(klass_name); 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_Klass()->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, BasicType bt) : ciType(bt) { 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(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii())); 70 assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii())); 71 72 // Check to see if the klasses are identical. 73 if (this == that) { 74 return true; 75 } 76 77 VM_ENTRY_MARK; 78 Klass* this_klass = get_Klass(); 79 Klass* that_klass = that->get_Klass(); 80 bool result = this_klass->is_subtype_of(that_klass); 81 82 return result; 83 } 84 85 // ------------------------------------------------------------------ 86 // ciKlass::is_subclass_of 87 bool ciKlass::is_subclass_of(ciKlass* that) { 88 assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii())); 89 assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii())); 90 91 VM_ENTRY_MARK; 92 Klass* this_klass = get_Klass(); 93 Klass* that_klass = that->get_Klass(); 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"); 103 104 VM_ENTRY_MARK; 105 Klass* this_klass = get_Klass(); 106 return this_klass->super_depth(); 107 } 108 109 // ------------------------------------------------------------------ 110 // ciKlass::super_check_offset 111 juint ciKlass::super_check_offset() { 112 assert(is_loaded(), "must be loaded"); 113 114 VM_ENTRY_MARK; 115 Klass* this_klass = get_Klass(); 116 return this_klass->super_check_offset(); 117 } 118 119 // ------------------------------------------------------------------ 120 // ciKlass::super_of_depth 121 ciKlass* ciKlass::super_of_depth(juint i) { 122 assert(is_loaded(), "must be loaded"); 123 124 VM_ENTRY_MARK; 125 Klass* this_klass = get_Klass(); 126 Klass* super = this_klass->primary_super_of_depth(i); 127 return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL; 128 } 129 130 // ------------------------------------------------------------------ 131 // ciKlass::can_be_primary_super 132 bool ciKlass::can_be_primary_super() { 133 assert(is_loaded(), "must be loaded"); 134 135 VM_ENTRY_MARK; 136 Klass* this_klass = get_Klass(); 137 return this_klass->can_be_primary_super(); 138 } 139 140 // ------------------------------------------------------------------ 141 // ciKlass::least_common_ancestor 142 // 143 // Get the shared parent of two klasses. 144 // 145 // Implementation note: this method currently goes "over the wall" 146 // and does all of the work on the VM side. It could be rewritten 147 // to use the super() method and do all of the work (aside from the 148 // lazy computation of super()) in native mode. This may be 149 // worthwhile if the compiler is repeatedly requesting the same lca 150 // computation or possibly if most of the superklasses have already 151 // been created as ciObjects anyway. Something to think about... 152 ciKlass* 153 ciKlass::least_common_ancestor(ciKlass* that) { 154 assert(is_loaded() && that->is_loaded(), "must be loaded"); 155 // Check to see if the klasses are identical. 156 if (this == that) { 157 return this; 158 } 159 160 VM_ENTRY_MARK; 161 Klass* this_klass = get_Klass(); 162 Klass* that_klass = that->get_Klass(); 163 Klass* lca = this_klass->LCA(that_klass); 164 165 // Many times the LCA will be either this_klass or that_klass. 166 // Treat these as special cases. 167 if (lca == that_klass) { 168 return that; 169 } 170 if (this_klass == lca) { 171 return this; 172 } 173 174 // Create the ciInstanceKlass for the lca. 175 ciKlass* result = 176 CURRENT_THREAD_ENV->get_klass(lca); 177 178 return result; 179 } 180 181 // ------------------------------------------------------------------ 182 // ciKlass::find_klass 183 // 184 // Find a klass using this klass's class loader. 185 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) { 186 assert(is_loaded(), "cannot find_klass through an unloaded klass"); 187 return CURRENT_ENV->get_klass_by_name(this, 188 klass_name, false); 189 } 190 191 // ------------------------------------------------------------------ 192 // ciKlass::java_mirror 193 // 194 // Get the instance of java.lang.Class corresponding to this klass. 195 // If it is an unloaded instance or array klass, return an unloaded 196 // mirror object of type Class. 197 ciInstance* ciKlass::java_mirror() { 198 GUARDED_VM_ENTRY( 199 if (!is_loaded()) 200 return ciEnv::current()->get_unloaded_klass_mirror(this); 201 oop java_mirror = get_Klass()->java_mirror(); 202 return CURRENT_ENV->get_instance(java_mirror); 203 ) 204 } 205 206 // ------------------------------------------------------------------ 207 // ciKlass::modifier_flags 208 jint ciKlass::modifier_flags() { 209 assert(is_loaded(), "not loaded"); 210 GUARDED_VM_ENTRY( 211 return get_Klass()->modifier_flags(); 212 ) 213 } 214 215 // ------------------------------------------------------------------ 216 // ciKlass::access_flags 217 jint ciKlass::access_flags() { 218 assert(is_loaded(), "not loaded"); 219 GUARDED_VM_ENTRY( 220 return get_Klass()->access_flags().as_int(); 221 ) 222 } 223 224 // ------------------------------------------------------------------ 225 // ciKlass::print_impl 226 // 227 // Implementation of the print method 228 void ciKlass::print_impl(outputStream* st) { 229 st->print(" name="); 230 print_name_on(st); 231 } 232 233 // ------------------------------------------------------------------ 234 // ciKlass::print_name 235 // 236 // Print the name of this klass 237 void ciKlass::print_name_on(outputStream* st) { 238 name()->print_symbol_on(st); 239 } 240 241 const char* ciKlass::external_name() const { 242 GUARDED_VM_ENTRY( 243 return get_Klass()->external_name(); 244 ) 245 }