1 /* 2 * Copyright (c) 2003, 2011, 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 "gc_implementation/shared/markSweep.inline.hpp" 27 #include "interpreter/interpreter.hpp" 28 #include "memory/gcLocker.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "oops/constMethodKlass.hpp" 31 #include "oops/constMethodOop.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "oops/oop.inline2.hpp" 34 #include "runtime/handles.inline.hpp" 35 36 37 klassOop constMethodKlass::create_klass(TRAPS) { 38 constMethodKlass o; 39 KlassHandle h_this_klass(THREAD, Universe::klassKlassObj()); 40 KlassHandle k = base_create_klass(h_this_klass, header_size(), 41 o.vtbl_value(), CHECK_NULL); 42 // Make sure size calculation is right 43 assert(k()->size() == align_object_size(header_size()), 44 "wrong size for object"); 45 //java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror 46 return k(); 47 } 48 49 50 int constMethodKlass::oop_size(oop obj) const { 51 assert(obj->is_constMethod(), "must be constMethod oop"); 52 return constMethodOop(obj)->object_size(); 53 } 54 55 bool constMethodKlass::oop_is_parsable(oop obj) const { 56 assert(obj->is_constMethod(), "must be constMethod oop"); 57 return constMethodOop(obj)->object_is_parsable(); 58 } 59 60 bool constMethodKlass::oop_is_conc_safe(oop obj) const { 61 assert(obj->is_constMethod(), "must be constMethod oop"); 62 return constMethodOop(obj)->is_conc_safe(); 63 } 64 65 constMethodOop constMethodKlass::allocate(int byte_code_size, 66 int compressed_line_number_size, 67 int localvariable_table_length, 68 int checked_exceptions_length, 69 bool is_conc_safe, 70 TRAPS) { 71 72 int size = constMethodOopDesc::object_size(byte_code_size, 73 compressed_line_number_size, 74 localvariable_table_length, 75 checked_exceptions_length); 76 KlassHandle h_k(THREAD, as_klassOop()); 77 constMethodOop cm = (constMethodOop) 78 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); 79 assert(!cm->is_parsable(), "Not yet safely parsable"); 80 No_Safepoint_Verifier no_safepoint; 81 cm->set_interpreter_kind(Interpreter::invalid); 82 cm->init_fingerprint(); 83 cm->set_method(NULL); 84 cm->set_stackmap_data(NULL); 85 cm->set_exception_table(NULL); 86 cm->set_code_size(byte_code_size); 87 cm->set_constMethod_size(size); 88 cm->set_inlined_tables_length(checked_exceptions_length, 89 compressed_line_number_size, 90 localvariable_table_length); 91 assert(cm->size() == size, "wrong size for object"); 92 cm->set_is_conc_safe(is_conc_safe); 93 cm->set_partially_loaded(); 94 assert(cm->is_parsable(), "Is safely parsable by gc"); 95 return cm; 96 } 97 98 void constMethodKlass::oop_follow_contents(oop obj) { 99 assert (obj->is_constMethod(), "object must be constMethod"); 100 constMethodOop cm = constMethodOop(obj); 101 MarkSweep::mark_and_push(cm->adr_method()); 102 MarkSweep::mark_and_push(cm->adr_stackmap_data()); 103 MarkSweep::mark_and_push(cm->adr_exception_table()); 104 // Performance tweak: We skip iterating over the klass pointer since we 105 // know that Universe::constMethodKlassObj never moves. 106 } 107 108 #ifndef SERIALGC 109 void constMethodKlass::oop_follow_contents(ParCompactionManager* cm, 110 oop obj) { 111 assert (obj->is_constMethod(), "object must be constMethod"); 112 constMethodOop cm_oop = constMethodOop(obj); 113 PSParallelCompact::mark_and_push(cm, cm_oop->adr_method()); 114 PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data()); 115 PSParallelCompact::mark_and_push(cm, cm_oop->adr_exception_table()); 116 // Performance tweak: We skip iterating over the klass pointer since we 117 // know that Universe::constMethodKlassObj never moves. 118 } 119 #endif // SERIALGC 120 121 int constMethodKlass::oop_oop_iterate(oop obj, OopClosure* blk) { 122 assert (obj->is_constMethod(), "object must be constMethod"); 123 constMethodOop cm = constMethodOop(obj); 124 blk->do_oop(cm->adr_method()); 125 blk->do_oop(cm->adr_stackmap_data()); 126 blk->do_oop(cm->adr_exception_table()); 127 // Get size before changing pointers. 128 // Don't call size() or oop_size() since that is a virtual call. 129 int size = cm->object_size(); 130 return size; 131 } 132 133 134 int constMethodKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 135 assert (obj->is_constMethod(), "object must be constMethod"); 136 constMethodOop cm = constMethodOop(obj); 137 oop* adr; 138 adr = cm->adr_method(); 139 if (mr.contains(adr)) blk->do_oop(adr); 140 adr = cm->adr_stackmap_data(); 141 if (mr.contains(adr)) blk->do_oop(adr); 142 adr = cm->adr_exception_table(); 143 if (mr.contains(adr)) blk->do_oop(adr); 144 // Get size before changing pointers. 145 // Don't call size() or oop_size() since that is a virtual call. 146 int size = cm->object_size(); 147 // Performance tweak: We skip iterating over the klass pointer since we 148 // know that Universe::constMethodKlassObj never moves. 149 return size; 150 } 151 152 153 int constMethodKlass::oop_adjust_pointers(oop obj) { 154 assert(obj->is_constMethod(), "should be constMethod"); 155 constMethodOop cm = constMethodOop(obj); 156 MarkSweep::adjust_pointer(cm->adr_method()); 157 MarkSweep::adjust_pointer(cm->adr_stackmap_data()); 158 MarkSweep::adjust_pointer(cm->adr_exception_table()); 159 // Get size before changing pointers. 160 // Don't call size() or oop_size() since that is a virtual call. 161 int size = cm->object_size(); 162 // Performance tweak: We skip iterating over the klass pointer since we 163 // know that Universe::constMethodKlassObj never moves. 164 return size; 165 } 166 167 #ifndef SERIALGC 168 void constMethodKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { 169 assert(obj->is_constMethod(), "should be constMethod"); 170 } 171 172 int constMethodKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { 173 assert(obj->is_constMethod(), "should be constMethod"); 174 constMethodOop cm_oop = constMethodOop(obj); 175 oop* const beg_oop = cm_oop->oop_block_beg(); 176 oop* const end_oop = cm_oop->oop_block_end(); 177 for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) { 178 PSParallelCompact::adjust_pointer(cur_oop); 179 } 180 return cm_oop->object_size(); 181 } 182 #endif // SERIALGC 183 184 // Printing 185 186 void constMethodKlass::oop_print_on(oop obj, outputStream* st) { 187 ResourceMark rm; 188 assert(obj->is_constMethod(), "must be constMethod"); 189 Klass::oop_print_on(obj, st); 190 constMethodOop m = constMethodOop(obj); 191 st->print(" - method: " INTPTR_FORMAT " ", (address)m->method()); 192 m->method()->print_value_on(st); st->cr(); 193 st->print(" - exceptions: " INTPTR_FORMAT "\n", (address)m->exception_table()); 194 if (m->has_stackmap_table()) { 195 st->print(" - stackmap data: "); 196 m->stackmap_data()->print_value_on(st); 197 st->cr(); 198 } 199 } 200 201 // Short version of printing constMethodOop - just print the name of the 202 // method it belongs to. 203 void constMethodKlass::oop_print_value_on(oop obj, outputStream* st) { 204 assert(obj->is_constMethod(), "must be constMethod"); 205 constMethodOop m = constMethodOop(obj); 206 st->print(" const part of method " ); 207 m->method()->print_value_on(st); 208 } 209 210 const char* constMethodKlass::internal_name() const { 211 return "{constMethod}"; 212 } 213 214 215 // Verification 216 217 void constMethodKlass::oop_verify_on(oop obj, outputStream* st) { 218 Klass::oop_verify_on(obj, st); 219 guarantee(obj->is_constMethod(), "object must be constMethod"); 220 constMethodOop m = constMethodOop(obj); 221 guarantee(m->is_perm(), "should be in permspace"); 222 223 // Verification can occur during oop construction before the method or 224 // other fields have been initialized. 225 if (!obj->partially_loaded()) { 226 guarantee(m->method()->is_perm(), "should be in permspace"); 227 guarantee(m->method()->is_method(), "should be method"); 228 typeArrayOop stackmap_data = m->stackmap_data(); 229 guarantee(stackmap_data == NULL || 230 stackmap_data->is_perm(), "should be in permspace"); 231 guarantee(m->exception_table()->is_perm(), "should be in permspace"); 232 guarantee(m->exception_table()->is_typeArray(), "should be type array"); 233 234 address m_end = (address)((oop*) m + m->size()); 235 address compressed_table_start = m->code_end(); 236 guarantee(compressed_table_start <= m_end, "invalid method layout"); 237 address compressed_table_end = compressed_table_start; 238 // Verify line number table 239 if (m->has_linenumber_table()) { 240 CompressedLineNumberReadStream stream(m->compressed_linenumber_table()); 241 while (stream.read_pair()) { 242 guarantee(stream.bci() >= 0 && stream.bci() <= m->code_size(), "invalid bci in line number table"); 243 } 244 compressed_table_end += stream.position(); 245 } 246 guarantee(compressed_table_end <= m_end, "invalid method layout"); 247 // Verify checked exceptions and local variable tables 248 if (m->has_checked_exceptions()) { 249 u2* addr = m->checked_exceptions_length_addr(); 250 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); 251 } 252 if (m->has_localvariable_table()) { 253 u2* addr = m->localvariable_table_length_addr(); 254 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); 255 } 256 // Check compressed_table_end relative to uncompressed_table_start 257 u2* uncompressed_table_start; 258 if (m->has_localvariable_table()) { 259 uncompressed_table_start = (u2*) m->localvariable_table_start(); 260 } else { 261 if (m->has_checked_exceptions()) { 262 uncompressed_table_start = (u2*) m->checked_exceptions_start(); 263 } else { 264 uncompressed_table_start = (u2*) m_end; 265 } 266 } 267 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end; 268 int max_gap = align_object_size(1)*BytesPerWord; 269 guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); 270 } 271 } 272 273 bool constMethodKlass::oop_partially_loaded(oop obj) const { 274 assert(obj->is_constMethod(), "object must be klass"); 275 constMethodOop m = constMethodOop(obj); 276 // check whether exception_table points to self (flag for partially loaded) 277 return m->exception_table() == (typeArrayOop)obj; 278 } 279 280 281 // The exception_table is the last field set when loading an object. 282 void constMethodKlass::oop_set_partially_loaded(oop obj) { 283 assert(obj->is_constMethod(), "object must be klass"); 284 constMethodOop m = constMethodOop(obj); 285 // Temporarily set exception_table to point to self 286 m->set_exception_table((typeArrayOop)obj); 287 }