Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiRedefineClasses.cpp @ 2142:8012aa3ccede
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
| author | never |
|---|---|
| date | Thu, 13 Jan 2011 22:15:41 -0800 |
| parents | dad31fc330cd |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2142 | 2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
|
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "classfile/verifier.hpp" | |
| 28 #include "code/codeCache.hpp" | |
| 29 #include "interpreter/oopMapCache.hpp" | |
| 30 #include "interpreter/rewriter.hpp" | |
| 31 #include "memory/gcLocker.hpp" | |
| 32 #include "memory/universe.inline.hpp" | |
| 33 #include "oops/klassVtable.hpp" | |
| 34 #include "prims/jvmtiImpl.hpp" | |
| 35 #include "prims/jvmtiRedefineClasses.hpp" | |
| 36 #include "prims/methodComparator.hpp" | |
| 37 #include "runtime/deoptimization.hpp" | |
| 38 #include "runtime/relocator.hpp" | |
| 39 #include "utilities/bitMap.inline.hpp" | |
| 0 | 40 |
| 41 | |
| 42 objArrayOop VM_RedefineClasses::_old_methods = NULL; | |
| 43 objArrayOop VM_RedefineClasses::_new_methods = NULL; | |
| 44 methodOop* VM_RedefineClasses::_matching_old_methods = NULL; | |
| 45 methodOop* VM_RedefineClasses::_matching_new_methods = NULL; | |
| 46 methodOop* VM_RedefineClasses::_deleted_methods = NULL; | |
| 47 methodOop* VM_RedefineClasses::_added_methods = NULL; | |
| 48 int VM_RedefineClasses::_matching_methods_length = 0; | |
| 49 int VM_RedefineClasses::_deleted_methods_length = 0; | |
| 50 int VM_RedefineClasses::_added_methods_length = 0; | |
| 51 klassOop VM_RedefineClasses::_the_class_oop = NULL; | |
| 52 | |
| 53 | |
| 54 VM_RedefineClasses::VM_RedefineClasses(jint class_count, | |
| 55 const jvmtiClassDefinition *class_defs, | |
| 56 JvmtiClassLoadKind class_load_kind) { | |
| 57 _class_count = class_count; | |
| 58 _class_defs = class_defs; | |
| 59 _class_load_kind = class_load_kind; | |
| 60 _res = JVMTI_ERROR_NONE; | |
| 61 } | |
| 62 | |
| 63 bool VM_RedefineClasses::doit_prologue() { | |
| 64 if (_class_count == 0) { | |
| 65 _res = JVMTI_ERROR_NONE; | |
| 66 return false; | |
| 67 } | |
| 68 if (_class_defs == NULL) { | |
| 69 _res = JVMTI_ERROR_NULL_POINTER; | |
| 70 return false; | |
| 71 } | |
| 72 for (int i = 0; i < _class_count; i++) { | |
| 73 if (_class_defs[i].klass == NULL) { | |
| 74 _res = JVMTI_ERROR_INVALID_CLASS; | |
| 75 return false; | |
| 76 } | |
| 77 if (_class_defs[i].class_byte_count == 0) { | |
| 78 _res = JVMTI_ERROR_INVALID_CLASS_FORMAT; | |
| 79 return false; | |
| 80 } | |
| 81 if (_class_defs[i].class_bytes == NULL) { | |
| 82 _res = JVMTI_ERROR_NULL_POINTER; | |
| 83 return false; | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 // Start timer after all the sanity checks; not quite accurate, but | |
| 88 // better than adding a bunch of stop() calls. | |
| 89 RC_TIMER_START(_timer_vm_op_prologue); | |
| 90 | |
| 91 // We first load new class versions in the prologue, because somewhere down the | |
| 92 // call chain it is required that the current thread is a Java thread. | |
| 93 _res = load_new_class_versions(Thread::current()); | |
| 94 if (_res != JVMTI_ERROR_NONE) { | |
| 95 // Free os::malloc allocated memory in load_new_class_version. | |
| 96 os::free(_scratch_classes); | |
| 97 RC_TIMER_STOP(_timer_vm_op_prologue); | |
| 98 return false; | |
| 99 } | |
| 100 | |
| 101 RC_TIMER_STOP(_timer_vm_op_prologue); | |
| 102 return true; | |
| 103 } | |
| 104 | |
| 105 void VM_RedefineClasses::doit() { | |
| 106 Thread *thread = Thread::current(); | |
| 107 | |
| 108 if (UseSharedSpaces) { | |
| 109 // Sharing is enabled so we remap the shared readonly space to | |
| 110 // shared readwrite, private just in case we need to redefine | |
| 111 // a shared class. We do the remap during the doit() phase of | |
| 112 // the safepoint to be safer. | |
| 113 if (!CompactingPermGenGen::remap_shared_readonly_as_readwrite()) { | |
| 114 RC_TRACE_WITH_THREAD(0x00000001, thread, | |
| 115 ("failed to remap shared readonly space to readwrite, private")); | |
| 116 _res = JVMTI_ERROR_INTERNAL; | |
| 117 return; | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 for (int i = 0; i < _class_count; i++) { | |
| 122 redefine_single_class(_class_defs[i].klass, _scratch_classes[i], thread); | |
| 123 } | |
| 124 // Disable any dependent concurrent compilations | |
| 125 SystemDictionary::notice_modification(); | |
| 126 | |
| 127 // Set flag indicating that some invariants are no longer true. | |
| 128 // See jvmtiExport.hpp for detailed explanation. | |
| 129 JvmtiExport::set_has_redefined_a_class(); | |
| 130 | |
| 131 #ifdef ASSERT | |
| 132 SystemDictionary::classes_do(check_class, thread); | |
| 133 #endif | |
| 134 } | |
| 135 | |
| 136 void VM_RedefineClasses::doit_epilogue() { | |
| 137 // Free os::malloc allocated memory. | |
| 138 // The memory allocated in redefine will be free'ed in next VM operation. | |
| 139 os::free(_scratch_classes); | |
| 140 | |
| 141 if (RC_TRACE_ENABLED(0x00000004)) { | |
| 142 // Used to have separate timers for "doit" and "all", but the timer | |
| 143 // overhead skewed the measurements. | |
| 144 jlong doit_time = _timer_rsc_phase1.milliseconds() + | |
| 145 _timer_rsc_phase2.milliseconds(); | |
| 146 jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time; | |
| 147 | |
| 148 RC_TRACE(0x00000004, ("vm_op: all=" UINT64_FORMAT | |
| 149 " prologue=" UINT64_FORMAT " doit=" UINT64_FORMAT, all_time, | |
| 150 _timer_vm_op_prologue.milliseconds(), doit_time)); | |
| 151 RC_TRACE(0x00000004, | |
| 152 ("redefine_single_class: phase1=" UINT64_FORMAT " phase2=" UINT64_FORMAT, | |
| 153 _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds())); | |
| 154 } | |
| 155 } | |
| 156 | |
| 157 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) { | |
| 158 // classes for primitives cannot be redefined | |
| 159 if (java_lang_Class::is_primitive(klass_mirror)) { | |
| 160 return false; | |
| 161 } | |
| 162 klassOop the_class_oop = java_lang_Class::as_klassOop(klass_mirror); | |
| 163 // classes for arrays cannot be redefined | |
| 164 if (the_class_oop == NULL || !Klass::cast(the_class_oop)->oop_is_instance()) { | |
| 165 return false; | |
| 166 } | |
| 167 return true; | |
| 168 } | |
| 169 | |
| 170 // Append the current entry at scratch_i in scratch_cp to *merge_cp_p | |
| 171 // where the end of *merge_cp_p is specified by *merge_cp_length_p. For | |
| 172 // direct CP entries, there is just the current entry to append. For | |
| 173 // indirect and double-indirect CP entries, there are zero or more | |
| 174 // referenced CP entries along with the current entry to append. | |
| 175 // Indirect and double-indirect CP entries are handled by recursive | |
| 176 // calls to append_entry() as needed. The referenced CP entries are | |
| 177 // always appended to *merge_cp_p before the referee CP entry. These | |
| 178 // referenced CP entries may already exist in *merge_cp_p in which case | |
| 179 // there is nothing extra to append and only the current entry is | |
| 180 // appended. | |
| 181 void VM_RedefineClasses::append_entry(constantPoolHandle scratch_cp, | |
| 182 int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, | |
| 183 TRAPS) { | |
| 184 | |
| 185 // append is different depending on entry tag type | |
| 186 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 187 | |
| 188 // The old verifier is implemented outside the VM. It loads classes, | |
| 189 // but does not resolve constant pool entries directly so we never | |
| 190 // see Class entries here with the old verifier. Similarly the old | |
| 191 // verifier does not like Class entries in the input constant pool. | |
| 192 // The split-verifier is implemented in the VM so it can optionally | |
| 193 // and directly resolve constant pool entries to load classes. The | |
| 194 // split-verifier can accept either Class entries or UnresolvedClass | |
| 195 // entries in the input constant pool. We revert the appended copy | |
| 196 // back to UnresolvedClass so that either verifier will be happy | |
| 197 // with the constant pool entry. | |
| 198 case JVM_CONSTANT_Class: | |
| 199 { | |
| 200 // revert the copy to JVM_CONSTANT_UnresolvedClass | |
| 201 (*merge_cp_p)->unresolved_klass_at_put(*merge_cp_length_p, | |
| 202 scratch_cp->klass_name_at(scratch_i)); | |
| 203 | |
| 204 if (scratch_i != *merge_cp_length_p) { | |
| 205 // The new entry in *merge_cp_p is at a different index than | |
| 206 // the new entry in scratch_cp so we need to map the index values. | |
| 207 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 208 } | |
| 209 (*merge_cp_length_p)++; | |
| 210 } break; | |
| 211 | |
| 212 // these are direct CP entries so they can be directly appended, | |
| 213 // but double and long take two constant pool entries | |
| 214 case JVM_CONSTANT_Double: // fall through | |
| 215 case JVM_CONSTANT_Long: | |
| 216 { | |
|
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217 constantPoolOopDesc::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p, |
| 0 | 218 THREAD); |
| 219 | |
| 220 if (scratch_i != *merge_cp_length_p) { | |
| 221 // The new entry in *merge_cp_p is at a different index than | |
| 222 // the new entry in scratch_cp so we need to map the index values. | |
| 223 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 224 } | |
| 225 (*merge_cp_length_p) += 2; | |
| 226 } break; | |
| 227 | |
| 228 // these are direct CP entries so they can be directly appended | |
| 229 case JVM_CONSTANT_Float: // fall through | |
| 230 case JVM_CONSTANT_Integer: // fall through | |
| 231 case JVM_CONSTANT_Utf8: // fall through | |
| 232 | |
| 233 // This was an indirect CP entry, but it has been changed into | |
| 234 // an interned string so this entry can be directly appended. | |
| 235 case JVM_CONSTANT_String: // fall through | |
| 236 | |
| 237 // These were indirect CP entries, but they have been changed into | |
| 238 // symbolOops so these entries can be directly appended. | |
| 239 case JVM_CONSTANT_UnresolvedClass: // fall through | |
| 240 case JVM_CONSTANT_UnresolvedString: | |
| 241 { | |
|
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242 constantPoolOopDesc::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p, |
| 0 | 243 THREAD); |
| 244 | |
| 245 if (scratch_i != *merge_cp_length_p) { | |
| 246 // The new entry in *merge_cp_p is at a different index than | |
| 247 // the new entry in scratch_cp so we need to map the index values. | |
| 248 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 249 } | |
| 250 (*merge_cp_length_p)++; | |
| 251 } break; | |
| 252 | |
| 253 // this is an indirect CP entry so it needs special handling | |
| 254 case JVM_CONSTANT_NameAndType: | |
| 255 { | |
| 256 int name_ref_i = scratch_cp->name_ref_index_at(scratch_i); | |
| 257 int new_name_ref_i = 0; | |
| 258 bool match = (name_ref_i < *merge_cp_length_p) && | |
| 259 scratch_cp->compare_entry_to(name_ref_i, *merge_cp_p, name_ref_i, | |
| 260 THREAD); | |
| 261 if (!match) { | |
| 262 // forward reference in *merge_cp_p or not a direct match | |
| 263 | |
| 264 int found_i = scratch_cp->find_matching_entry(name_ref_i, *merge_cp_p, | |
| 265 THREAD); | |
| 266 if (found_i != 0) { | |
| 267 guarantee(found_i != name_ref_i, | |
| 268 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 269 | |
| 270 // Found a matching entry somewhere else in *merge_cp_p so | |
| 271 // just need a mapping entry. | |
| 272 new_name_ref_i = found_i; | |
| 273 map_index(scratch_cp, name_ref_i, found_i); | |
| 274 } else { | |
| 275 // no match found so we have to append this entry to *merge_cp_p | |
| 276 append_entry(scratch_cp, name_ref_i, merge_cp_p, merge_cp_length_p, | |
| 277 THREAD); | |
| 278 // The above call to append_entry() can only append one entry | |
| 279 // so the post call query of *merge_cp_length_p is only for | |
| 280 // the sake of consistency. | |
| 281 new_name_ref_i = *merge_cp_length_p - 1; | |
| 282 } | |
| 283 } | |
| 284 | |
| 285 int signature_ref_i = scratch_cp->signature_ref_index_at(scratch_i); | |
| 286 int new_signature_ref_i = 0; | |
| 287 match = (signature_ref_i < *merge_cp_length_p) && | |
| 288 scratch_cp->compare_entry_to(signature_ref_i, *merge_cp_p, | |
| 289 signature_ref_i, THREAD); | |
| 290 if (!match) { | |
| 291 // forward reference in *merge_cp_p or not a direct match | |
| 292 | |
| 293 int found_i = scratch_cp->find_matching_entry(signature_ref_i, | |
| 294 *merge_cp_p, THREAD); | |
| 295 if (found_i != 0) { | |
| 296 guarantee(found_i != signature_ref_i, | |
| 297 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 298 | |
| 299 // Found a matching entry somewhere else in *merge_cp_p so | |
| 300 // just need a mapping entry. | |
| 301 new_signature_ref_i = found_i; | |
| 302 map_index(scratch_cp, signature_ref_i, found_i); | |
| 303 } else { | |
| 304 // no match found so we have to append this entry to *merge_cp_p | |
| 305 append_entry(scratch_cp, signature_ref_i, merge_cp_p, | |
| 306 merge_cp_length_p, THREAD); | |
| 307 // The above call to append_entry() can only append one entry | |
| 308 // so the post call query of *merge_cp_length_p is only for | |
| 309 // the sake of consistency. | |
| 310 new_signature_ref_i = *merge_cp_length_p - 1; | |
| 311 } | |
| 312 } | |
| 313 | |
| 314 // If the referenced entries already exist in *merge_cp_p, then | |
| 315 // both new_name_ref_i and new_signature_ref_i will both be 0. | |
| 316 // In that case, all we are appending is the current entry. | |
| 317 if (new_name_ref_i == 0) { | |
| 318 new_name_ref_i = name_ref_i; | |
| 319 } else { | |
| 320 RC_TRACE(0x00080000, | |
| 321 ("NameAndType entry@%d name_ref_index change: %d to %d", | |
| 322 *merge_cp_length_p, name_ref_i, new_name_ref_i)); | |
| 323 } | |
| 324 if (new_signature_ref_i == 0) { | |
| 325 new_signature_ref_i = signature_ref_i; | |
| 326 } else { | |
| 327 RC_TRACE(0x00080000, | |
| 328 ("NameAndType entry@%d signature_ref_index change: %d to %d", | |
| 329 *merge_cp_length_p, signature_ref_i, new_signature_ref_i)); | |
| 330 } | |
| 331 | |
| 332 (*merge_cp_p)->name_and_type_at_put(*merge_cp_length_p, | |
| 333 new_name_ref_i, new_signature_ref_i); | |
| 334 if (scratch_i != *merge_cp_length_p) { | |
| 335 // The new entry in *merge_cp_p is at a different index than | |
| 336 // the new entry in scratch_cp so we need to map the index values. | |
| 337 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 338 } | |
| 339 (*merge_cp_length_p)++; | |
| 340 } break; | |
| 341 | |
| 342 // this is a double-indirect CP entry so it needs special handling | |
| 343 case JVM_CONSTANT_Fieldref: // fall through | |
| 344 case JVM_CONSTANT_InterfaceMethodref: // fall through | |
| 345 case JVM_CONSTANT_Methodref: | |
| 346 { | |
| 347 int klass_ref_i = scratch_cp->uncached_klass_ref_index_at(scratch_i); | |
| 348 int new_klass_ref_i = 0; | |
| 349 bool match = (klass_ref_i < *merge_cp_length_p) && | |
| 350 scratch_cp->compare_entry_to(klass_ref_i, *merge_cp_p, klass_ref_i, | |
| 351 THREAD); | |
| 352 if (!match) { | |
| 353 // forward reference in *merge_cp_p or not a direct match | |
| 354 | |
| 355 int found_i = scratch_cp->find_matching_entry(klass_ref_i, *merge_cp_p, | |
| 356 THREAD); | |
| 357 if (found_i != 0) { | |
| 358 guarantee(found_i != klass_ref_i, | |
| 359 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 360 | |
| 361 // Found a matching entry somewhere else in *merge_cp_p so | |
| 362 // just need a mapping entry. | |
| 363 new_klass_ref_i = found_i; | |
| 364 map_index(scratch_cp, klass_ref_i, found_i); | |
| 365 } else { | |
| 366 // no match found so we have to append this entry to *merge_cp_p | |
| 367 append_entry(scratch_cp, klass_ref_i, merge_cp_p, merge_cp_length_p, | |
| 368 THREAD); | |
| 369 // The above call to append_entry() can only append one entry | |
| 370 // so the post call query of *merge_cp_length_p is only for | |
| 371 // the sake of consistency. Without the optimization where we | |
| 372 // use JVM_CONSTANT_UnresolvedClass, then up to two entries | |
| 373 // could be appended. | |
| 374 new_klass_ref_i = *merge_cp_length_p - 1; | |
| 375 } | |
| 376 } | |
| 377 | |
| 378 int name_and_type_ref_i = | |
| 379 scratch_cp->uncached_name_and_type_ref_index_at(scratch_i); | |
| 380 int new_name_and_type_ref_i = 0; | |
| 381 match = (name_and_type_ref_i < *merge_cp_length_p) && | |
| 382 scratch_cp->compare_entry_to(name_and_type_ref_i, *merge_cp_p, | |
| 383 name_and_type_ref_i, THREAD); | |
| 384 if (!match) { | |
| 385 // forward reference in *merge_cp_p or not a direct match | |
| 386 | |
| 387 int found_i = scratch_cp->find_matching_entry(name_and_type_ref_i, | |
| 388 *merge_cp_p, THREAD); | |
| 389 if (found_i != 0) { | |
| 390 guarantee(found_i != name_and_type_ref_i, | |
| 391 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 392 | |
| 393 // Found a matching entry somewhere else in *merge_cp_p so | |
| 394 // just need a mapping entry. | |
| 395 new_name_and_type_ref_i = found_i; | |
| 396 map_index(scratch_cp, name_and_type_ref_i, found_i); | |
| 397 } else { | |
| 398 // no match found so we have to append this entry to *merge_cp_p | |
| 399 append_entry(scratch_cp, name_and_type_ref_i, merge_cp_p, | |
| 400 merge_cp_length_p, THREAD); | |
| 401 // The above call to append_entry() can append more than | |
| 402 // one entry so the post call query of *merge_cp_length_p | |
| 403 // is required in order to get the right index for the | |
| 404 // JVM_CONSTANT_NameAndType entry. | |
| 405 new_name_and_type_ref_i = *merge_cp_length_p - 1; | |
| 406 } | |
| 407 } | |
| 408 | |
| 409 // If the referenced entries already exist in *merge_cp_p, then | |
| 410 // both new_klass_ref_i and new_name_and_type_ref_i will both be | |
| 411 // 0. In that case, all we are appending is the current entry. | |
| 412 if (new_klass_ref_i == 0) { | |
| 413 new_klass_ref_i = klass_ref_i; | |
| 414 } | |
| 415 if (new_name_and_type_ref_i == 0) { | |
| 416 new_name_and_type_ref_i = name_and_type_ref_i; | |
| 417 } | |
| 418 | |
| 419 const char *entry_name; | |
| 420 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 421 case JVM_CONSTANT_Fieldref: | |
| 422 entry_name = "Fieldref"; | |
| 423 (*merge_cp_p)->field_at_put(*merge_cp_length_p, new_klass_ref_i, | |
| 424 new_name_and_type_ref_i); | |
| 425 break; | |
| 426 case JVM_CONSTANT_InterfaceMethodref: | |
| 427 entry_name = "IFMethodref"; | |
| 428 (*merge_cp_p)->interface_method_at_put(*merge_cp_length_p, | |
| 429 new_klass_ref_i, new_name_and_type_ref_i); | |
| 430 break; | |
| 431 case JVM_CONSTANT_Methodref: | |
| 432 entry_name = "Methodref"; | |
| 433 (*merge_cp_p)->method_at_put(*merge_cp_length_p, new_klass_ref_i, | |
| 434 new_name_and_type_ref_i); | |
| 435 break; | |
| 436 default: | |
| 437 guarantee(false, "bad switch"); | |
| 438 break; | |
| 439 } | |
| 440 | |
| 441 if (klass_ref_i != new_klass_ref_i) { | |
| 442 RC_TRACE(0x00080000, ("%s entry@%d class_index changed: %d to %d", | |
| 443 entry_name, *merge_cp_length_p, klass_ref_i, new_klass_ref_i)); | |
| 444 } | |
| 445 if (name_and_type_ref_i != new_name_and_type_ref_i) { | |
| 446 RC_TRACE(0x00080000, | |
| 447 ("%s entry@%d name_and_type_index changed: %d to %d", | |
| 448 entry_name, *merge_cp_length_p, name_and_type_ref_i, | |
| 449 new_name_and_type_ref_i)); | |
| 450 } | |
| 451 | |
| 452 if (scratch_i != *merge_cp_length_p) { | |
| 453 // The new entry in *merge_cp_p is at a different index than | |
| 454 // the new entry in scratch_cp so we need to map the index values. | |
| 455 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 456 } | |
| 457 (*merge_cp_length_p)++; | |
| 458 } break; | |
| 459 | |
| 460 // At this stage, Class or UnresolvedClass could be here, but not | |
| 461 // ClassIndex | |
| 462 case JVM_CONSTANT_ClassIndex: // fall through | |
| 463 | |
| 464 // Invalid is used as the tag for the second constant pool entry | |
| 465 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
| 466 // not be seen by itself. | |
| 467 case JVM_CONSTANT_Invalid: // fall through | |
| 468 | |
| 469 // At this stage, String or UnresolvedString could be here, but not | |
| 470 // StringIndex | |
| 471 case JVM_CONSTANT_StringIndex: // fall through | |
| 472 | |
| 473 // At this stage JVM_CONSTANT_UnresolvedClassInError should not be | |
| 474 // here | |
| 475 case JVM_CONSTANT_UnresolvedClassInError: // fall through | |
| 476 | |
| 477 default: | |
| 478 { | |
| 479 // leave a breadcrumb | |
| 480 jbyte bad_value = scratch_cp->tag_at(scratch_i).value(); | |
| 481 ShouldNotReachHere(); | |
| 482 } break; | |
| 483 } // end switch tag value | |
| 484 } // end append_entry() | |
| 485 | |
| 486 | |
| 487 void VM_RedefineClasses::swap_all_method_annotations(int i, int j, instanceKlassHandle scratch_class) { | |
| 488 typeArrayOop save; | |
| 489 | |
| 490 save = scratch_class->get_method_annotations_of(i); | |
| 491 scratch_class->set_method_annotations_of(i, scratch_class->get_method_annotations_of(j)); | |
| 492 scratch_class->set_method_annotations_of(j, save); | |
| 493 | |
| 494 save = scratch_class->get_method_parameter_annotations_of(i); | |
| 495 scratch_class->set_method_parameter_annotations_of(i, scratch_class->get_method_parameter_annotations_of(j)); | |
| 496 scratch_class->set_method_parameter_annotations_of(j, save); | |
| 497 | |
| 498 save = scratch_class->get_method_default_annotations_of(i); | |
| 499 scratch_class->set_method_default_annotations_of(i, scratch_class->get_method_default_annotations_of(j)); | |
| 500 scratch_class->set_method_default_annotations_of(j, save); | |
| 501 } | |
| 502 | |
| 503 | |
| 504 jvmtiError VM_RedefineClasses::compare_and_normalize_class_versions( | |
| 505 instanceKlassHandle the_class, | |
| 506 instanceKlassHandle scratch_class) { | |
| 507 int i; | |
| 508 | |
| 509 // Check superclasses, or rather their names, since superclasses themselves can be | |
| 510 // requested to replace. | |
| 511 // Check for NULL superclass first since this might be java.lang.Object | |
| 512 if (the_class->super() != scratch_class->super() && | |
| 513 (the_class->super() == NULL || scratch_class->super() == NULL || | |
| 514 Klass::cast(the_class->super())->name() != | |
| 515 Klass::cast(scratch_class->super())->name())) { | |
| 516 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; | |
| 517 } | |
| 518 | |
| 519 // Check if the number, names and order of directly implemented interfaces are the same. | |
| 520 // I think in principle we should just check if the sets of names of directly implemented | |
| 521 // interfaces are the same, i.e. the order of declaration (which, however, if changed in the | |
| 522 // .java file, also changes in .class file) should not matter. However, comparing sets is | |
| 523 // technically a bit more difficult, and, more importantly, I am not sure at present that the | |
| 524 // order of interfaces does not matter on the implementation level, i.e. that the VM does not | |
| 525 // rely on it somewhere. | |
| 526 objArrayOop k_interfaces = the_class->local_interfaces(); | |
| 527 objArrayOop k_new_interfaces = scratch_class->local_interfaces(); | |
| 528 int n_intfs = k_interfaces->length(); | |
| 529 if (n_intfs != k_new_interfaces->length()) { | |
| 530 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; | |
| 531 } | |
| 532 for (i = 0; i < n_intfs; i++) { | |
| 533 if (Klass::cast((klassOop) k_interfaces->obj_at(i))->name() != | |
| 534 Klass::cast((klassOop) k_new_interfaces->obj_at(i))->name()) { | |
| 535 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; | |
| 536 } | |
| 537 } | |
| 538 | |
| 539 // Check whether class is in the error init state. | |
| 540 if (the_class->is_in_error_state()) { | |
| 541 // TBD #5057930: special error code is needed in 1.6 | |
| 542 return JVMTI_ERROR_INVALID_CLASS; | |
| 543 } | |
| 544 | |
| 545 // Check whether class modifiers are the same. | |
| 546 jushort old_flags = (jushort) the_class->access_flags().get_flags(); | |
| 547 jushort new_flags = (jushort) scratch_class->access_flags().get_flags(); | |
| 548 if (old_flags != new_flags) { | |
| 549 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_CLASS_MODIFIERS_CHANGED; | |
| 550 } | |
| 551 | |
| 552 // Check if the number, names, types and order of fields declared in these classes | |
| 553 // are the same. | |
| 554 typeArrayOop k_old_fields = the_class->fields(); | |
| 555 typeArrayOop k_new_fields = scratch_class->fields(); | |
| 556 int n_fields = k_old_fields->length(); | |
| 557 if (n_fields != k_new_fields->length()) { | |
| 558 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 559 } | |
| 560 | |
| 561 for (i = 0; i < n_fields; i += instanceKlass::next_offset) { | |
| 562 // access | |
| 563 old_flags = k_old_fields->ushort_at(i + instanceKlass::access_flags_offset); | |
| 564 new_flags = k_new_fields->ushort_at(i + instanceKlass::access_flags_offset); | |
| 565 if ((old_flags ^ new_flags) & JVM_RECOGNIZED_FIELD_MODIFIERS) { | |
| 566 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 567 } | |
| 568 // offset | |
| 569 if (k_old_fields->short_at(i + instanceKlass::low_offset) != | |
| 570 k_new_fields->short_at(i + instanceKlass::low_offset) || | |
| 571 k_old_fields->short_at(i + instanceKlass::high_offset) != | |
| 572 k_new_fields->short_at(i + instanceKlass::high_offset)) { | |
| 573 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 574 } | |
| 575 // name and signature | |
| 576 jshort name_index = k_old_fields->short_at(i + instanceKlass::name_index_offset); | |
| 577 jshort sig_index = k_old_fields->short_at(i +instanceKlass::signature_index_offset); | |
| 578 symbolOop name_sym1 = the_class->constants()->symbol_at(name_index); | |
| 579 symbolOop sig_sym1 = the_class->constants()->symbol_at(sig_index); | |
| 580 name_index = k_new_fields->short_at(i + instanceKlass::name_index_offset); | |
| 581 sig_index = k_new_fields->short_at(i + instanceKlass::signature_index_offset); | |
| 582 symbolOop name_sym2 = scratch_class->constants()->symbol_at(name_index); | |
| 583 symbolOop sig_sym2 = scratch_class->constants()->symbol_at(sig_index); | |
| 584 if (name_sym1 != name_sym2 || sig_sym1 != sig_sym2) { | |
| 585 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 586 } | |
| 587 } | |
| 588 | |
| 589 // Do a parallel walk through the old and new methods. Detect | |
| 590 // cases where they match (exist in both), have been added in | |
| 591 // the new methods, or have been deleted (exist only in the | |
| 592 // old methods). The class file parser places methods in order | |
| 593 // by method name, but does not order overloaded methods by | |
| 594 // signature. In order to determine what fate befell the methods, | |
| 595 // this code places the overloaded new methods that have matching | |
| 596 // old methods in the same order as the old methods and places | |
| 597 // new overloaded methods at the end of overloaded methods of | |
| 598 // that name. The code for this order normalization is adapted | |
| 599 // from the algorithm used in instanceKlass::find_method(). | |
| 600 // Since we are swapping out of order entries as we find them, | |
| 601 // we only have to search forward through the overloaded methods. | |
| 602 // Methods which are added and have the same name as an existing | |
| 603 // method (but different signature) will be put at the end of | |
| 604 // the methods with that name, and the name mismatch code will | |
| 605 // handle them. | |
| 606 objArrayHandle k_old_methods(the_class->methods()); | |
| 607 objArrayHandle k_new_methods(scratch_class->methods()); | |
| 608 int n_old_methods = k_old_methods->length(); | |
| 609 int n_new_methods = k_new_methods->length(); | |
| 610 | |
| 611 int ni = 0; | |
| 612 int oi = 0; | |
| 613 while (true) { | |
| 614 methodOop k_old_method; | |
| 615 methodOop k_new_method; | |
| 616 enum { matched, added, deleted, undetermined } method_was = undetermined; | |
| 617 | |
| 618 if (oi >= n_old_methods) { | |
| 619 if (ni >= n_new_methods) { | |
| 620 break; // we've looked at everything, done | |
| 621 } | |
| 622 // New method at the end | |
| 623 k_new_method = (methodOop) k_new_methods->obj_at(ni); | |
| 624 method_was = added; | |
| 625 } else if (ni >= n_new_methods) { | |
| 626 // Old method, at the end, is deleted | |
| 627 k_old_method = (methodOop) k_old_methods->obj_at(oi); | |
| 628 method_was = deleted; | |
| 629 } else { | |
| 630 // There are more methods in both the old and new lists | |
| 631 k_old_method = (methodOop) k_old_methods->obj_at(oi); | |
| 632 k_new_method = (methodOop) k_new_methods->obj_at(ni); | |
| 633 if (k_old_method->name() != k_new_method->name()) { | |
| 634 // Methods are sorted by method name, so a mismatch means added | |
| 635 // or deleted | |
| 636 if (k_old_method->name()->fast_compare(k_new_method->name()) > 0) { | |
| 637 method_was = added; | |
| 638 } else { | |
| 639 method_was = deleted; | |
| 640 } | |
| 641 } else if (k_old_method->signature() == k_new_method->signature()) { | |
| 642 // Both the name and signature match | |
| 643 method_was = matched; | |
| 644 } else { | |
| 645 // The name matches, but the signature doesn't, which means we have to | |
| 646 // search forward through the new overloaded methods. | |
| 647 int nj; // outside the loop for post-loop check | |
| 648 for (nj = ni + 1; nj < n_new_methods; nj++) { | |
| 649 methodOop m = (methodOop)k_new_methods->obj_at(nj); | |
| 650 if (k_old_method->name() != m->name()) { | |
| 651 // reached another method name so no more overloaded methods | |
| 652 method_was = deleted; | |
| 653 break; | |
| 654 } | |
| 655 if (k_old_method->signature() == m->signature()) { | |
| 656 // found a match so swap the methods | |
| 657 k_new_methods->obj_at_put(ni, m); | |
| 658 k_new_methods->obj_at_put(nj, k_new_method); | |
| 659 k_new_method = m; | |
| 660 method_was = matched; | |
| 661 break; | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 if (nj >= n_new_methods) { | |
| 666 // reached the end without a match; so method was deleted | |
| 667 method_was = deleted; | |
| 668 } | |
| 669 } | |
| 670 } | |
| 671 | |
| 672 switch (method_was) { | |
| 673 case matched: | |
| 674 // methods match, be sure modifiers do too | |
| 675 old_flags = (jushort) k_old_method->access_flags().get_flags(); | |
| 676 new_flags = (jushort) k_new_method->access_flags().get_flags(); | |
| 677 if ((old_flags ^ new_flags) & ~(JVM_ACC_NATIVE)) { | |
| 678 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_MODIFIERS_CHANGED; | |
| 679 } | |
| 680 { | |
| 681 u2 new_num = k_new_method->method_idnum(); | |
| 682 u2 old_num = k_old_method->method_idnum(); | |
| 683 if (new_num != old_num) { | |
| 684 methodOop idnum_owner = scratch_class->method_with_idnum(old_num); | |
| 685 if (idnum_owner != NULL) { | |
| 686 // There is already a method assigned this idnum -- switch them | |
| 687 idnum_owner->set_method_idnum(new_num); | |
| 688 } | |
| 689 k_new_method->set_method_idnum(old_num); | |
| 690 swap_all_method_annotations(old_num, new_num, scratch_class); | |
| 691 } | |
| 692 } | |
| 693 RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]", | |
| 694 k_new_method->name_and_sig_as_C_string(), ni, | |
| 695 k_old_method->name_and_sig_as_C_string(), oi)); | |
| 696 // advance to next pair of methods | |
| 697 ++oi; | |
| 698 ++ni; | |
| 699 break; | |
| 700 case added: | |
| 701 // method added, see if it is OK | |
| 702 new_flags = (jushort) k_new_method->access_flags().get_flags(); | |
| 703 if ((new_flags & JVM_ACC_PRIVATE) == 0 | |
| 704 // hack: private should be treated as final, but alas | |
| 705 || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0 | |
| 706 ) { | |
| 707 // new methods must be private | |
| 708 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED; | |
| 709 } | |
| 710 { | |
| 711 u2 num = the_class->next_method_idnum(); | |
| 712 if (num == constMethodOopDesc::UNSET_IDNUM) { | |
| 713 // cannot add any more methods | |
| 714 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED; | |
| 715 } | |
| 716 u2 new_num = k_new_method->method_idnum(); | |
| 717 methodOop idnum_owner = scratch_class->method_with_idnum(num); | |
| 718 if (idnum_owner != NULL) { | |
| 719 // There is already a method assigned this idnum -- switch them | |
| 720 idnum_owner->set_method_idnum(new_num); | |
| 721 } | |
| 722 k_new_method->set_method_idnum(num); | |
| 723 swap_all_method_annotations(new_num, num, scratch_class); | |
| 724 } | |
| 725 RC_TRACE(0x00008000, ("Method added: new: %s [%d]", | |
| 726 k_new_method->name_and_sig_as_C_string(), ni)); | |
| 727 ++ni; // advance to next new method | |
| 728 break; | |
| 729 case deleted: | |
| 730 // method deleted, see if it is OK | |
| 731 old_flags = (jushort) k_old_method->access_flags().get_flags(); | |
| 732 if ((old_flags & JVM_ACC_PRIVATE) == 0 | |
| 733 // hack: private should be treated as final, but alas | |
| 734 || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0 | |
| 735 ) { | |
| 736 // deleted methods must be private | |
| 737 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED; | |
| 738 } | |
| 739 RC_TRACE(0x00008000, ("Method deleted: old: %s [%d]", | |
| 740 k_old_method->name_and_sig_as_C_string(), oi)); | |
| 741 ++oi; // advance to next old method | |
| 742 break; | |
| 743 default: | |
| 744 ShouldNotReachHere(); | |
| 745 } | |
| 746 } | |
| 747 | |
| 748 return JVMTI_ERROR_NONE; | |
| 749 } | |
| 750 | |
| 751 | |
| 752 // Find new constant pool index value for old constant pool index value | |
| 753 // by seaching the index map. Returns zero (0) if there is no mapped | |
| 754 // value for the old constant pool index. | |
| 755 int VM_RedefineClasses::find_new_index(int old_index) { | |
| 756 if (_index_map_count == 0) { | |
| 757 // map is empty so nothing can be found | |
| 758 return 0; | |
| 759 } | |
| 760 | |
| 761 if (old_index < 1 || old_index >= _index_map_p->length()) { | |
| 762 // The old_index is out of range so it is not mapped. This should | |
| 763 // not happen in regular constant pool merging use, but it can | |
| 764 // happen if a corrupt annotation is processed. | |
| 765 return 0; | |
| 766 } | |
| 767 | |
| 768 int value = _index_map_p->at(old_index); | |
| 769 if (value == -1) { | |
| 770 // the old_index is not mapped | |
| 771 return 0; | |
| 772 } | |
| 773 | |
| 774 return value; | |
| 775 } // end find_new_index() | |
| 776 | |
| 777 | |
| 778 // Returns true if the current mismatch is due to a resolved/unresolved | |
| 779 // class pair. Otherwise, returns false. | |
| 780 bool VM_RedefineClasses::is_unresolved_class_mismatch(constantPoolHandle cp1, | |
| 781 int index1, constantPoolHandle cp2, int index2) { | |
| 782 | |
| 783 jbyte t1 = cp1->tag_at(index1).value(); | |
| 784 if (t1 != JVM_CONSTANT_Class && t1 != JVM_CONSTANT_UnresolvedClass) { | |
| 785 return false; // wrong entry type; not our special case | |
| 786 } | |
| 787 | |
| 788 jbyte t2 = cp2->tag_at(index2).value(); | |
| 789 if (t2 != JVM_CONSTANT_Class && t2 != JVM_CONSTANT_UnresolvedClass) { | |
| 790 return false; // wrong entry type; not our special case | |
| 791 } | |
| 792 | |
| 793 if (t1 == t2) { | |
| 794 return false; // not a mismatch; not our special case | |
| 795 } | |
| 796 | |
| 797 char *s1 = cp1->klass_name_at(index1)->as_C_string(); | |
| 798 char *s2 = cp2->klass_name_at(index2)->as_C_string(); | |
| 799 if (strcmp(s1, s2) != 0) { | |
| 800 return false; // strings don't match; not our special case | |
| 801 } | |
| 802 | |
| 803 return true; // made it through the gauntlet; this is our special case | |
| 804 } // end is_unresolved_class_mismatch() | |
| 805 | |
| 806 | |
| 807 // Returns true if the current mismatch is due to a resolved/unresolved | |
| 808 // string pair. Otherwise, returns false. | |
| 809 bool VM_RedefineClasses::is_unresolved_string_mismatch(constantPoolHandle cp1, | |
| 810 int index1, constantPoolHandle cp2, int index2) { | |
| 811 | |
| 812 jbyte t1 = cp1->tag_at(index1).value(); | |
| 813 if (t1 != JVM_CONSTANT_String && t1 != JVM_CONSTANT_UnresolvedString) { | |
| 814 return false; // wrong entry type; not our special case | |
| 815 } | |
| 816 | |
| 817 jbyte t2 = cp2->tag_at(index2).value(); | |
| 818 if (t2 != JVM_CONSTANT_String && t2 != JVM_CONSTANT_UnresolvedString) { | |
| 819 return false; // wrong entry type; not our special case | |
| 820 } | |
| 821 | |
| 822 if (t1 == t2) { | |
| 823 return false; // not a mismatch; not our special case | |
| 824 } | |
| 825 | |
| 826 char *s1 = cp1->string_at_noresolve(index1); | |
| 827 char *s2 = cp2->string_at_noresolve(index2); | |
| 828 if (strcmp(s1, s2) != 0) { | |
| 829 return false; // strings don't match; not our special case | |
| 830 } | |
| 831 | |
| 832 return true; // made it through the gauntlet; this is our special case | |
| 833 } // end is_unresolved_string_mismatch() | |
| 834 | |
| 835 | |
| 836 jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) { | |
| 837 // For consistency allocate memory using os::malloc wrapper. | |
| 838 _scratch_classes = (instanceKlassHandle *) | |
| 839 os::malloc(sizeof(instanceKlassHandle) * _class_count); | |
| 840 if (_scratch_classes == NULL) { | |
| 841 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 842 } | |
| 843 | |
| 844 ResourceMark rm(THREAD); | |
| 845 | |
| 846 JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current()); | |
|
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847 // state can only be NULL if the current thread is exiting which |
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848 // should not happen since we're trying to do a RedefineClasses |
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849 guarantee(state != NULL, "exiting thread calling load_new_class_versions"); |
| 0 | 850 for (int i = 0; i < _class_count; i++) { |
| 851 oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass); | |
| 852 // classes for primitives cannot be redefined | |
| 853 if (!is_modifiable_class(mirror)) { | |
| 854 return JVMTI_ERROR_UNMODIFIABLE_CLASS; | |
| 855 } | |
| 856 klassOop the_class_oop = java_lang_Class::as_klassOop(mirror); | |
| 857 instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop); | |
| 858 symbolHandle the_class_sym = symbolHandle(THREAD, the_class->name()); | |
| 859 | |
| 860 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 861 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
| 862 ("loading name=%s (avail_mem=" UINT64_FORMAT "K)", | |
| 863 the_class->external_name(), os::available_memory() >> 10)); | |
| 864 | |
| 865 ClassFileStream st((u1*) _class_defs[i].class_bytes, | |
| 866 _class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__"); | |
| 867 | |
| 868 // Parse the stream. | |
| 869 Handle the_class_loader(THREAD, the_class->class_loader()); | |
| 870 Handle protection_domain(THREAD, the_class->protection_domain()); | |
| 871 // Set redefined class handle in JvmtiThreadState class. | |
| 872 // This redefined class is sent to agent event handler for class file | |
| 873 // load hook event. | |
| 874 state->set_class_being_redefined(&the_class, _class_load_kind); | |
| 875 | |
| 876 klassOop k = SystemDictionary::parse_stream(the_class_sym, | |
| 877 the_class_loader, | |
| 878 protection_domain, | |
| 879 &st, | |
| 880 THREAD); | |
| 881 // Clear class_being_redefined just to be sure. | |
| 882 state->clear_class_being_redefined(); | |
| 883 | |
| 884 // TODO: if this is retransform, and nothing changed we can skip it | |
| 885 | |
| 886 instanceKlassHandle scratch_class (THREAD, k); | |
| 887 | |
| 888 if (HAS_PENDING_EXCEPTION) { | |
| 889 symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name(); | |
| 890 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 891 RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("parse_stream exception: '%s'", | |
| 892 ex_name->as_C_string())); | |
| 893 CLEAR_PENDING_EXCEPTION; | |
| 894 | |
| 895 if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) { | |
| 896 return JVMTI_ERROR_UNSUPPORTED_VERSION; | |
| 897 } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) { | |
| 898 return JVMTI_ERROR_INVALID_CLASS_FORMAT; | |
| 899 } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) { | |
| 900 return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION; | |
| 901 } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) { | |
| 902 // The message will be "XXX (wrong name: YYY)" | |
| 903 return JVMTI_ERROR_NAMES_DONT_MATCH; | |
| 904 } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 905 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 906 } else { // Just in case more exceptions can be thrown.. | |
| 907 return JVMTI_ERROR_FAILS_VERIFICATION; | |
| 908 } | |
| 909 } | |
| 910 | |
| 911 // Ensure class is linked before redefine | |
| 912 if (!the_class->is_linked()) { | |
| 913 the_class->link_class(THREAD); | |
| 914 if (HAS_PENDING_EXCEPTION) { | |
| 915 symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name(); | |
| 916 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 917 RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("link_class exception: '%s'", | |
| 918 ex_name->as_C_string())); | |
| 919 CLEAR_PENDING_EXCEPTION; | |
| 920 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 921 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 922 } else { | |
| 923 return JVMTI_ERROR_INTERNAL; | |
| 924 } | |
| 925 } | |
| 926 } | |
| 927 | |
| 928 // Do the validity checks in compare_and_normalize_class_versions() | |
| 929 // before verifying the byte codes. By doing these checks first, we | |
| 930 // limit the number of functions that require redirection from | |
| 931 // the_class to scratch_class. In particular, we don't have to | |
| 932 // modify JNI GetSuperclass() and thus won't change its performance. | |
| 933 jvmtiError res = compare_and_normalize_class_versions(the_class, | |
| 934 scratch_class); | |
| 935 if (res != JVMTI_ERROR_NONE) { | |
| 936 return res; | |
| 937 } | |
| 938 | |
| 939 // verify what the caller passed us | |
| 940 { | |
| 941 // The bug 6214132 caused the verification to fail. | |
| 942 // Information about the_class and scratch_class is temporarily | |
| 943 // recorded into jvmtiThreadState. This data is used to redirect | |
| 944 // the_class to scratch_class in the JVM_* functions called by the | |
| 945 // verifier. Please, refer to jvmtiThreadState.hpp for the detailed | |
| 946 // description. | |
| 947 RedefineVerifyMark rvm(&the_class, &scratch_class, state); | |
| 948 Verifier::verify( | |
|
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949 scratch_class, Verifier::ThrowException, true, THREAD); |
| 0 | 950 } |
| 951 | |
| 952 if (HAS_PENDING_EXCEPTION) { | |
| 953 symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name(); | |
| 954 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 955 RC_TRACE_WITH_THREAD(0x00000002, THREAD, | |
| 956 ("verify_byte_codes exception: '%s'", ex_name->as_C_string())); | |
| 957 CLEAR_PENDING_EXCEPTION; | |
| 958 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 959 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 960 } else { | |
| 961 // tell the caller the bytecodes are bad | |
| 962 return JVMTI_ERROR_FAILS_VERIFICATION; | |
| 963 } | |
| 964 } | |
| 965 | |
| 966 res = merge_cp_and_rewrite(the_class, scratch_class, THREAD); | |
| 967 if (res != JVMTI_ERROR_NONE) { | |
| 968 return res; | |
| 969 } | |
| 970 | |
| 971 if (VerifyMergedCPBytecodes) { | |
| 972 // verify what we have done during constant pool merging | |
| 973 { | |
| 974 RedefineVerifyMark rvm(&the_class, &scratch_class, state); | |
|
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975 Verifier::verify(scratch_class, Verifier::ThrowException, true, THREAD); |
| 0 | 976 } |
| 977 | |
| 978 if (HAS_PENDING_EXCEPTION) { | |
| 979 symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name(); | |
| 980 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 981 RC_TRACE_WITH_THREAD(0x00000002, THREAD, | |
| 982 ("verify_byte_codes post merge-CP exception: '%s'", | |
| 983 ex_name->as_C_string())); | |
| 984 CLEAR_PENDING_EXCEPTION; | |
| 985 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 986 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 987 } else { | |
| 988 // tell the caller that constant pool merging screwed up | |
| 989 return JVMTI_ERROR_INTERNAL; | |
| 990 } | |
| 991 } | |
| 992 } | |
| 993 | |
| 994 Rewriter::rewrite(scratch_class, THREAD); | |
| 995 if (HAS_PENDING_EXCEPTION) { | |
| 996 symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name(); | |
| 997 CLEAR_PENDING_EXCEPTION; | |
| 998 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 999 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 1000 } else { | |
| 1001 return JVMTI_ERROR_INTERNAL; | |
| 1002 } | |
| 1003 } | |
| 1004 | |
| 1005 _scratch_classes[i] = scratch_class; | |
| 1006 | |
| 1007 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 1008 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
| 1009 ("loaded name=%s (avail_mem=" UINT64_FORMAT "K)", | |
| 1010 the_class->external_name(), os::available_memory() >> 10)); | |
| 1011 } | |
| 1012 | |
| 1013 return JVMTI_ERROR_NONE; | |
| 1014 } | |
| 1015 | |
| 1016 | |
| 1017 // Map old_index to new_index as needed. scratch_cp is only needed | |
| 1018 // for RC_TRACE() calls. | |
| 1019 void VM_RedefineClasses::map_index(constantPoolHandle scratch_cp, | |
| 1020 int old_index, int new_index) { | |
| 1021 if (find_new_index(old_index) != 0) { | |
| 1022 // old_index is already mapped | |
| 1023 return; | |
| 1024 } | |
| 1025 | |
| 1026 if (old_index == new_index) { | |
| 1027 // no mapping is needed | |
| 1028 return; | |
| 1029 } | |
| 1030 | |
| 1031 _index_map_p->at_put(old_index, new_index); | |
| 1032 _index_map_count++; | |
| 1033 | |
| 1034 RC_TRACE(0x00040000, ("mapped tag %d at index %d to %d", | |
| 1035 scratch_cp->tag_at(old_index).value(), old_index, new_index)); | |
| 1036 } // end map_index() | |
| 1037 | |
| 1038 | |
| 1039 // Merge old_cp and scratch_cp and return the results of the merge via | |
| 1040 // merge_cp_p. The number of entries in *merge_cp_p is returned via | |
| 1041 // merge_cp_length_p. The entries in old_cp occupy the same locations | |
| 1042 // in *merge_cp_p. Also creates a map of indices from entries in | |
| 1043 // scratch_cp to the corresponding entry in *merge_cp_p. Index map | |
| 1044 // entries are only created for entries in scratch_cp that occupy a | |
| 1045 // different location in *merged_cp_p. | |
| 1046 bool VM_RedefineClasses::merge_constant_pools(constantPoolHandle old_cp, | |
| 1047 constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p, | |
| 1048 int *merge_cp_length_p, TRAPS) { | |
| 1049 | |
| 1050 if (merge_cp_p == NULL) { | |
| 1051 assert(false, "caller must provide scatch constantPool"); | |
| 1052 return false; // robustness | |
| 1053 } | |
| 1054 if (merge_cp_length_p == NULL) { | |
| 1055 assert(false, "caller must provide scatch CP length"); | |
| 1056 return false; // robustness | |
| 1057 } | |
| 1058 // Worst case we need old_cp->length() + scratch_cp()->length(), | |
| 1059 // but the caller might be smart so make sure we have at least | |
| 1060 // the minimum. | |
| 1061 if ((*merge_cp_p)->length() < old_cp->length()) { | |
| 1062 assert(false, "merge area too small"); | |
| 1063 return false; // robustness | |
| 1064 } | |
| 1065 | |
| 1066 RC_TRACE_WITH_THREAD(0x00010000, THREAD, | |
| 1067 ("old_cp_len=%d, scratch_cp_len=%d", old_cp->length(), | |
| 1068 scratch_cp->length())); | |
| 1069 | |
| 1070 { | |
| 1071 // Pass 0: | |
| 1072 // The old_cp is copied to *merge_cp_p; this means that any code | |
| 1073 // using old_cp does not have to change. This work looks like a | |
| 1074 // perfect fit for constantPoolOop::copy_cp_to(), but we need to | |
| 1075 // handle one special case: | |
| 1076 // - revert JVM_CONSTANT_Class to JVM_CONSTANT_UnresolvedClass | |
| 1077 // This will make verification happy. | |
| 1078 | |
| 1079 int old_i; // index into old_cp | |
| 1080 | |
| 1081 // index zero (0) is not used in constantPools | |
| 1082 for (old_i = 1; old_i < old_cp->length(); old_i++) { | |
| 1083 // leave debugging crumb | |
| 1084 jbyte old_tag = old_cp->tag_at(old_i).value(); | |
| 1085 switch (old_tag) { | |
| 1086 case JVM_CONSTANT_Class: | |
| 1087 // revert the copy to JVM_CONSTANT_UnresolvedClass | |
| 1088 (*merge_cp_p)->unresolved_klass_at_put(old_i, | |
| 1089 old_cp->klass_name_at(old_i)); | |
| 1090 break; | |
| 1091 | |
| 1092 case JVM_CONSTANT_Double: | |
| 1093 case JVM_CONSTANT_Long: | |
| 1094 // just copy the entry to *merge_cp_p, but double and long take | |
| 1095 // two constant pool entries | |
|
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1096 constantPoolOopDesc::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0); |
| 0 | 1097 old_i++; |
| 1098 break; | |
| 1099 | |
| 1100 default: | |
| 1101 // just copy the entry to *merge_cp_p | |
|
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1102 constantPoolOopDesc::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0); |
| 0 | 1103 break; |
| 1104 } | |
| 1105 } // end for each old_cp entry | |
| 1106 | |
| 1107 // We don't need to sanity check that *merge_cp_length_p is within | |
| 1108 // *merge_cp_p bounds since we have the minimum on-entry check above. | |
| 1109 (*merge_cp_length_p) = old_i; | |
| 1110 } | |
| 1111 | |
| 1112 // merge_cp_len should be the same as old_cp->length() at this point | |
| 1113 // so this trace message is really a "warm-and-breathing" message. | |
| 1114 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
| 1115 ("after pass 0: merge_cp_len=%d", *merge_cp_length_p)); | |
| 1116 | |
| 1117 int scratch_i; // index into scratch_cp | |
| 1118 { | |
| 1119 // Pass 1a: | |
| 1120 // Compare scratch_cp entries to the old_cp entries that we have | |
| 1121 // already copied to *merge_cp_p. In this pass, we are eliminating | |
| 1122 // exact duplicates (matching entry at same index) so we only | |
| 1123 // compare entries in the common indice range. | |
| 1124 int increment = 1; | |
| 1125 int pass1a_length = MIN2(old_cp->length(), scratch_cp->length()); | |
| 1126 for (scratch_i = 1; scratch_i < pass1a_length; scratch_i += increment) { | |
| 1127 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 1128 case JVM_CONSTANT_Double: | |
| 1129 case JVM_CONSTANT_Long: | |
| 1130 // double and long take two constant pool entries | |
| 1131 increment = 2; | |
| 1132 break; | |
| 1133 | |
| 1134 default: | |
| 1135 increment = 1; | |
| 1136 break; | |
| 1137 } | |
| 1138 | |
| 1139 bool match = scratch_cp->compare_entry_to(scratch_i, *merge_cp_p, | |
| 1140 scratch_i, CHECK_0); | |
| 1141 if (match) { | |
| 1142 // found a match at the same index so nothing more to do | |
| 1143 continue; | |
| 1144 } else if (is_unresolved_class_mismatch(scratch_cp, scratch_i, | |
| 1145 *merge_cp_p, scratch_i)) { | |
| 1146 // The mismatch in compare_entry_to() above is because of a | |
| 1147 // resolved versus unresolved class entry at the same index | |
| 1148 // with the same string value. Since Pass 0 reverted any | |
| 1149 // class entries to unresolved class entries in *merge_cp_p, | |
| 1150 // we go with the unresolved class entry. | |
| 1151 continue; | |
| 1152 } else if (is_unresolved_string_mismatch(scratch_cp, scratch_i, | |
| 1153 *merge_cp_p, scratch_i)) { | |
| 1154 // The mismatch in compare_entry_to() above is because of a | |
| 1155 // resolved versus unresolved string entry at the same index | |
| 1156 // with the same string value. We can live with whichever | |
| 1157 // happens to be at scratch_i in *merge_cp_p. | |
| 1158 continue; | |
| 1159 } | |
| 1160 | |
| 1161 int found_i = scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, | |
| 1162 CHECK_0); | |
| 1163 if (found_i != 0) { | |
| 1164 guarantee(found_i != scratch_i, | |
| 1165 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 1166 | |
| 1167 // Found a matching entry somewhere else in *merge_cp_p so | |
| 1168 // just need a mapping entry. | |
| 1169 map_index(scratch_cp, scratch_i, found_i); | |
| 1170 continue; | |
| 1171 } | |
| 1172 | |
| 1173 // The find_matching_entry() call above could fail to find a match | |
| 1174 // due to a resolved versus unresolved class or string entry situation | |
| 1175 // like we solved above with the is_unresolved_*_mismatch() calls. | |
| 1176 // However, we would have to call is_unresolved_*_mismatch() over | |
| 1177 // all of *merge_cp_p (potentially) and that doesn't seem to be | |
| 1178 // worth the time. | |
| 1179 | |
| 1180 // No match found so we have to append this entry and any unique | |
| 1181 // referenced entries to *merge_cp_p. | |
| 1182 append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p, | |
| 1183 CHECK_0); | |
| 1184 } | |
| 1185 } | |
| 1186 | |
| 1187 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
| 1188 ("after pass 1a: merge_cp_len=%d, scratch_i=%d, index_map_len=%d", | |
| 1189 *merge_cp_length_p, scratch_i, _index_map_count)); | |
| 1190 | |
| 1191 if (scratch_i < scratch_cp->length()) { | |
| 1192 // Pass 1b: | |
| 1193 // old_cp is smaller than scratch_cp so there are entries in | |
| 1194 // scratch_cp that we have not yet processed. We take care of | |
| 1195 // those now. | |
| 1196 int increment = 1; | |
| 1197 for (; scratch_i < scratch_cp->length(); scratch_i += increment) { | |
| 1198 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 1199 case JVM_CONSTANT_Double: | |
| 1200 case JVM_CONSTANT_Long: | |
| 1201 // double and long take two constant pool entries | |
| 1202 increment = 2; | |
| 1203 break; | |
| 1204 | |
| 1205 default: | |
| 1206 increment = 1; | |
| 1207 break; | |
| 1208 } | |
| 1209 | |
| 1210 int found_i = | |
| 1211 scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, CHECK_0); | |
| 1212 if (found_i != 0) { | |
| 1213 // Found a matching entry somewhere else in *merge_cp_p so | |
| 1214 // just need a mapping entry. | |
| 1215 map_index(scratch_cp, scratch_i, found_i); | |
| 1216 continue; | |
| 1217 } | |
| 1218 | |
| 1219 // No match found so we have to append this entry and any unique | |
| 1220 // referenced entries to *merge_cp_p. | |
| 1221 append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p, | |
| 1222 CHECK_0); | |
| 1223 } | |
| 1224 | |
| 1225 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
| 1226 ("after pass 1b: merge_cp_len=%d, scratch_i=%d, index_map_len=%d", | |
| 1227 *merge_cp_length_p, scratch_i, _index_map_count)); | |
| 1228 } | |
| 1229 | |
| 1230 return true; | |
| 1231 } // end merge_constant_pools() | |
| 1232 | |
| 1233 | |
| 1234 // Merge constant pools between the_class and scratch_class and | |
| 1235 // potentially rewrite bytecodes in scratch_class to use the merged | |
| 1236 // constant pool. | |
| 1237 jvmtiError VM_RedefineClasses::merge_cp_and_rewrite( | |
| 1238 instanceKlassHandle the_class, instanceKlassHandle scratch_class, | |
| 1239 TRAPS) { | |
| 1240 // worst case merged constant pool length is old and new combined | |
| 1241 int merge_cp_length = the_class->constants()->length() | |
| 1242 + scratch_class->constants()->length(); | |
| 1243 | |
| 1244 constantPoolHandle old_cp(THREAD, the_class->constants()); | |
| 1245 constantPoolHandle scratch_cp(THREAD, scratch_class->constants()); | |
| 1246 | |
| 1247 // Constant pools are not easily reused so we allocate a new one | |
| 1248 // each time. | |
|
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1249 // merge_cp is created unsafe for concurrent GC processing. It |
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1250 // should be marked safe before discarding it because, even if |
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1251 // garbage. If it crosses a card boundary, it may be scanned |
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1252 // in order to find the start of the first complete object on the card. |
| 0 | 1253 constantPoolHandle merge_cp(THREAD, |
|
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1254 oopFactory::new_constantPool(merge_cp_length, |
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1255 methodOopDesc::IsUnsafeConc, |
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1256 THREAD)); |
| 0 | 1257 int orig_length = old_cp->orig_length(); |
| 1258 if (orig_length == 0) { | |
| 1259 // This old_cp is an actual original constant pool. We save | |
| 1260 // the original length in the merged constant pool so that | |
| 1261 // merge_constant_pools() can be more efficient. If a constant | |
| 1262 // pool has a non-zero orig_length() value, then that constant | |
| 1263 // pool was created by a merge operation in RedefineClasses. | |
| 1264 merge_cp->set_orig_length(old_cp->length()); | |
| 1265 } else { | |
| 1266 // This old_cp is a merged constant pool from a previous | |
| 1267 // RedefineClasses() calls so just copy the orig_length() | |
| 1268 // value. | |
| 1269 merge_cp->set_orig_length(old_cp->orig_length()); | |
| 1270 } | |
| 1271 | |
| 1272 ResourceMark rm(THREAD); | |
| 1273 _index_map_count = 0; | |
| 1274 _index_map_p = new intArray(scratch_cp->length(), -1); | |
| 1275 | |
| 1276 bool result = merge_constant_pools(old_cp, scratch_cp, &merge_cp, | |
| 1277 &merge_cp_length, THREAD); | |
| 1278 if (!result) { | |
| 1279 // The merge can fail due to memory allocation failure or due | |
| 1280 // to robustness checks. | |
| 1281 return JVMTI_ERROR_INTERNAL; | |
| 1282 } | |
| 1283 | |
| 1284 RC_TRACE_WITH_THREAD(0x00010000, THREAD, | |
| 1285 ("merge_cp_len=%d, index_map_len=%d", merge_cp_length, _index_map_count)); | |
| 1286 | |
| 1287 if (_index_map_count == 0) { | |
| 1288 // there is nothing to map between the new and merged constant pools | |
| 1289 | |
| 1290 if (old_cp->length() == scratch_cp->length()) { | |
| 1291 // The old and new constant pools are the same length and the | |
| 1292 // index map is empty. This means that the three constant pools | |
| 1293 // are equivalent (but not the same). Unfortunately, the new | |
| 1294 // constant pool has not gone through link resolution nor have | |
| 1295 // the new class bytecodes gone through constant pool cache | |
| 1296 // rewriting so we can't use the old constant pool with the new | |
| 1297 // class. | |
| 1298 | |
|
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1299 merge_cp()->set_is_conc_safe(true); |
| 0 | 1300 merge_cp = constantPoolHandle(); // toss the merged constant pool |
| 1301 } else if (old_cp->length() < scratch_cp->length()) { | |
| 1302 // The old constant pool has fewer entries than the new constant | |
| 1303 // pool and the index map is empty. This means the new constant | |
| 1304 // pool is a superset of the old constant pool. However, the old | |
| 1305 // class bytecodes have already gone through constant pool cache | |
| 1306 // rewriting so we can't use the new constant pool with the old | |
| 1307 // class. | |
| 1308 | |
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1309 merge_cp()->set_is_conc_safe(true); |
| 0 | 1310 merge_cp = constantPoolHandle(); // toss the merged constant pool |
| 1311 } else { | |
| 1312 // The old constant pool has more entries than the new constant | |
| 1313 // pool and the index map is empty. This means that both the old | |
| 1314 // and merged constant pools are supersets of the new constant | |
| 1315 // pool. | |
| 1316 | |
| 1317 // Replace the new constant pool with a shrunken copy of the | |
| 1318 // merged constant pool; the previous new constant pool will | |
| 1319 // get GCed. | |
| 1320 set_new_constant_pool(scratch_class, merge_cp, merge_cp_length, true, | |
| 1321 THREAD); | |
| 1322 // drop local ref to the merged constant pool | |
|
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1323 merge_cp()->set_is_conc_safe(true); |
| 0 | 1324 merge_cp = constantPoolHandle(); |
| 1325 } | |
| 1326 } else { | |
| 1327 if (RC_TRACE_ENABLED(0x00040000)) { | |
| 1328 // don't want to loop unless we are tracing | |
| 1329 int count = 0; | |
| 1330 for (int i = 1; i < _index_map_p->length(); i++) { | |
| 1331 int value = _index_map_p->at(i); | |
| 1332 | |
| 1333 if (value != -1) { | |
| 1334 RC_TRACE_WITH_THREAD(0x00040000, THREAD, | |
| 1335 ("index_map[%d]: old=%d new=%d", count, i, value)); | |
| 1336 count++; | |
| 1337 } | |
| 1338 } | |
| 1339 } | |
| 1340 | |
| 1341 // We have entries mapped between the new and merged constant pools | |
| 1342 // so we have to rewrite some constant pool references. | |
| 1343 if (!rewrite_cp_refs(scratch_class, THREAD)) { | |
| 1344 return JVMTI_ERROR_INTERNAL; | |
| 1345 } | |
| 1346 | |
| 1347 // Replace the new constant pool with a shrunken copy of the | |
| 1348 // merged constant pool so now the rewritten bytecodes have | |
| 1349 // valid references; the previous new constant pool will get | |
| 1350 // GCed. | |
| 1351 set_new_constant_pool(scratch_class, merge_cp, merge_cp_length, true, | |
| 1352 THREAD); | |
|
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1353 merge_cp()->set_is_conc_safe(true); |
| 0 | 1354 } |
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1355 assert(old_cp()->is_conc_safe(), "Just checking"); |
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1356 assert(scratch_cp()->is_conc_safe(), "Just checking"); |
| 0 | 1357 |
| 1358 return JVMTI_ERROR_NONE; | |
| 1359 } // end merge_cp_and_rewrite() | |
| 1360 | |
| 1361 | |
| 1362 // Rewrite constant pool references in klass scratch_class. | |
| 1363 bool VM_RedefineClasses::rewrite_cp_refs(instanceKlassHandle scratch_class, | |
| 1364 TRAPS) { | |
| 1365 | |
| 1366 // rewrite constant pool references in the methods: | |
| 1367 if (!rewrite_cp_refs_in_methods(scratch_class, THREAD)) { | |
| 605 | 1368 // propagate failure back to caller |
| 0 | 1369 return false; |
| 1370 } | |
| 1371 | |
| 1372 // rewrite constant pool references in the class_annotations: | |
| 1373 if (!rewrite_cp_refs_in_class_annotations(scratch_class, THREAD)) { | |
| 605 | 1374 // propagate failure back to caller |
| 0 | 1375 return false; |
| 1376 } | |
| 1377 | |
| 1378 // rewrite constant pool references in the fields_annotations: | |
| 1379 if (!rewrite_cp_refs_in_fields_annotations(scratch_class, THREAD)) { | |
| 605 | 1380 // propagate failure back to caller |
| 0 | 1381 return false; |
| 1382 } | |
| 1383 | |
| 1384 // rewrite constant pool references in the methods_annotations: | |
| 1385 if (!rewrite_cp_refs_in_methods_annotations(scratch_class, THREAD)) { | |
| 605 | 1386 // propagate failure back to caller |
| 0 | 1387 return false; |
| 1388 } | |
| 1389 | |
| 1390 // rewrite constant pool references in the methods_parameter_annotations: | |
| 1391 if (!rewrite_cp_refs_in_methods_parameter_annotations(scratch_class, | |
| 1392 THREAD)) { | |
| 605 | 1393 // propagate failure back to caller |
| 0 | 1394 return false; |
| 1395 } | |
| 1396 | |
| 1397 // rewrite constant pool references in the methods_default_annotations: | |
| 1398 if (!rewrite_cp_refs_in_methods_default_annotations(scratch_class, | |
| 1399 THREAD)) { | |
| 605 | 1400 // propagate failure back to caller |
| 0 | 1401 return false; |
| 1402 } | |
| 1403 | |
| 1404 return true; | |
| 1405 } // end rewrite_cp_refs() | |
| 1406 | |
| 1407 | |
| 1408 // Rewrite constant pool references in the methods. | |
| 1409 bool VM_RedefineClasses::rewrite_cp_refs_in_methods( | |
| 1410 instanceKlassHandle scratch_class, TRAPS) { | |
| 1411 | |
| 1412 objArrayHandle methods(THREAD, scratch_class->methods()); | |
| 1413 | |
| 1414 if (methods.is_null() || methods->length() == 0) { | |
| 1415 // no methods so nothing to do | |
| 1416 return true; | |
| 1417 } | |
| 1418 | |
| 1419 // rewrite constant pool references in the methods: | |
| 1420 for (int i = methods->length() - 1; i >= 0; i--) { | |
| 1421 methodHandle method(THREAD, (methodOop)methods->obj_at(i)); | |
| 1422 methodHandle new_method; | |
| 1423 rewrite_cp_refs_in_method(method, &new_method, CHECK_false); | |
| 1424 if (!new_method.is_null()) { | |
| 1425 // the method has been replaced so save the new method version | |
| 1426 methods->obj_at_put(i, new_method()); | |
| 1427 } | |
| 1428 } | |
| 1429 | |
| 1430 return true; | |
| 1431 } | |
| 1432 | |
| 1433 | |
| 1434 // Rewrite constant pool references in the specific method. This code | |
| 1435 // was adapted from Rewriter::rewrite_method(). | |
| 1436 void VM_RedefineClasses::rewrite_cp_refs_in_method(methodHandle method, | |
| 1437 methodHandle *new_method_p, TRAPS) { | |
| 1438 | |
| 1439 *new_method_p = methodHandle(); // default is no new method | |
| 1440 | |
| 1441 // We cache a pointer to the bytecodes here in code_base. If GC | |
| 1442 // moves the methodOop, then the bytecodes will also move which | |
| 1443 // will likely cause a crash. We create a No_Safepoint_Verifier | |
| 1444 // object to detect whether we pass a possible safepoint in this | |
| 1445 // code block. | |
| 1446 No_Safepoint_Verifier nsv; | |
| 1447 | |
| 1448 // Bytecodes and their length | |
| 1449 address code_base = method->code_base(); | |
| 1450 int code_length = method->code_size(); | |
| 1451 | |
| 1452 int bc_length; | |
| 1453 for (int bci = 0; bci < code_length; bci += bc_length) { | |
| 1454 address bcp = code_base + bci; | |
| 1455 Bytecodes::Code c = (Bytecodes::Code)(*bcp); | |
| 1456 | |
| 1457 bc_length = Bytecodes::length_for(c); | |
| 1458 if (bc_length == 0) { | |
| 1459 // More complicated bytecodes report a length of zero so | |
| 1460 // we have to try again a slightly different way. | |
| 2142 | 1461 bc_length = Bytecodes::length_at(method(), bcp); |
| 0 | 1462 } |
| 1463 | |
| 1464 assert(bc_length != 0, "impossible bytecode length"); | |
| 1465 | |
| 1466 switch (c) { | |
| 1467 case Bytecodes::_ldc: | |
| 1468 { | |
| 1469 int cp_index = *(bcp + 1); | |
| 1470 int new_index = find_new_index(cp_index); | |
| 1471 | |
| 1472 if (StressLdcRewrite && new_index == 0) { | |
| 1473 // If we are stressing ldc -> ldc_w rewriting, then we | |
| 1474 // always need a new_index value. | |
| 1475 new_index = cp_index; | |
| 1476 } | |
| 1477 if (new_index != 0) { | |
| 1478 // the original index is mapped so we have more work to do | |
| 1479 if (!StressLdcRewrite && new_index <= max_jubyte) { | |
| 1480 // The new value can still use ldc instead of ldc_w | |
| 1481 // unless we are trying to stress ldc -> ldc_w rewriting | |
| 1482 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 1483 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c), | |
| 1484 bcp, cp_index, new_index)); | |
| 1485 *(bcp + 1) = new_index; | |
| 1486 } else { | |
| 1487 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 1488 ("%s->ldc_w@" INTPTR_FORMAT " old=%d, new=%d", | |
| 1489 Bytecodes::name(c), bcp, cp_index, new_index)); | |
| 1490 // the new value needs ldc_w instead of ldc | |
| 1491 u_char inst_buffer[4]; // max instruction size is 4 bytes | |
| 1492 bcp = (address)inst_buffer; | |
| 1493 // construct new instruction sequence | |
| 1494 *bcp = Bytecodes::_ldc_w; | |
| 1495 bcp++; | |
| 1496 // Rewriter::rewrite_method() does not rewrite ldc -> ldc_w. | |
| 1497 // See comment below for difference between put_Java_u2() | |
| 1498 // and put_native_u2(). | |
| 1499 Bytes::put_Java_u2(bcp, new_index); | |
| 1500 | |
| 1501 Relocator rc(method, NULL /* no RelocatorListener needed */); | |
| 1502 methodHandle m; | |
| 1503 { | |
| 1504 Pause_No_Safepoint_Verifier pnsv(&nsv); | |
| 1505 | |
| 1506 // ldc is 2 bytes and ldc_w is 3 bytes | |
| 1507 m = rc.insert_space_at(bci, 3, inst_buffer, THREAD); | |
| 1508 if (m.is_null() || HAS_PENDING_EXCEPTION) { | |
| 1509 guarantee(false, "insert_space_at() failed"); | |
| 1510 } | |
| 1511 } | |
| 1512 | |
| 1513 // return the new method so that the caller can update | |
| 1514 // the containing class | |
| 1515 *new_method_p = method = m; | |
| 1516 // switch our bytecode processing loop from the old method | |
| 1517 // to the new method | |
| 1518 code_base = method->code_base(); | |
| 1519 code_length = method->code_size(); | |
| 1520 bcp = code_base + bci; | |
| 1521 c = (Bytecodes::Code)(*bcp); | |
| 1522 bc_length = Bytecodes::length_for(c); | |
| 1523 assert(bc_length != 0, "sanity check"); | |
| 1524 } // end we need ldc_w instead of ldc | |
| 1525 } // end if there is a mapped index | |
| 1526 } break; | |
| 1527 | |
| 1528 // these bytecodes have a two-byte constant pool index | |
| 1529 case Bytecodes::_anewarray : // fall through | |
| 1530 case Bytecodes::_checkcast : // fall through | |
| 1531 case Bytecodes::_getfield : // fall through | |
| 1532 case Bytecodes::_getstatic : // fall through | |
| 1533 case Bytecodes::_instanceof : // fall through | |
| 1534 case Bytecodes::_invokeinterface: // fall through | |
| 1535 case Bytecodes::_invokespecial : // fall through | |
| 1536 case Bytecodes::_invokestatic : // fall through | |
| 1537 case Bytecodes::_invokevirtual : // fall through | |
| 1538 case Bytecodes::_ldc_w : // fall through | |
| 1539 case Bytecodes::_ldc2_w : // fall through | |
| 1540 case Bytecodes::_multianewarray : // fall through | |
| 1541 case Bytecodes::_new : // fall through | |
| 1542 case Bytecodes::_putfield : // fall through | |
| 1543 case Bytecodes::_putstatic : | |
| 1544 { | |
| 1545 address p = bcp + 1; | |
| 1546 int cp_index = Bytes::get_Java_u2(p); | |
| 1547 int new_index = find_new_index(cp_index); | |
| 1548 if (new_index != 0) { | |
| 1549 // the original index is mapped so update w/ new value | |
| 1550 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 1551 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c), | |
| 1552 bcp, cp_index, new_index)); | |
| 1553 // Rewriter::rewrite_method() uses put_native_u2() in this | |
| 1554 // situation because it is reusing the constant pool index | |
| 1555 // location for a native index into the constantPoolCache. | |
| 1556 // Since we are updating the constant pool index prior to | |
| 1557 // verification and constantPoolCache initialization, we | |
| 1558 // need to keep the new index in Java byte order. | |
| 1559 Bytes::put_Java_u2(p, new_index); | |
| 1560 } | |
| 1561 } break; | |
| 1562 } | |
| 1563 } // end for each bytecode | |
| 1564 } // end rewrite_cp_refs_in_method() | |
| 1565 | |
| 1566 | |
| 1567 // Rewrite constant pool references in the class_annotations field. | |
| 1568 bool VM_RedefineClasses::rewrite_cp_refs_in_class_annotations( | |
| 1569 instanceKlassHandle scratch_class, TRAPS) { | |
| 1570 | |
| 1571 typeArrayHandle class_annotations(THREAD, | |
| 1572 scratch_class->class_annotations()); | |
| 1573 if (class_annotations.is_null() || class_annotations->length() == 0) { | |
| 1574 // no class_annotations so nothing to do | |
| 1575 return true; | |
| 1576 } | |
| 1577 | |
| 1578 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1579 ("class_annotations length=%d", class_annotations->length())); | |
| 1580 | |
| 1581 int byte_i = 0; // byte index into class_annotations | |
| 1582 return rewrite_cp_refs_in_annotations_typeArray(class_annotations, byte_i, | |
| 1583 THREAD); | |
| 1584 } | |
| 1585 | |
| 1586 | |
| 1587 // Rewrite constant pool references in an annotations typeArray. This | |
| 1588 // "structure" is adapted from the RuntimeVisibleAnnotations_attribute | |
| 1589 // that is described in section 4.8.15 of the 2nd-edition of the VM spec: | |
| 1590 // | |
| 1591 // annotations_typeArray { | |
| 1592 // u2 num_annotations; | |
| 1593 // annotation annotations[num_annotations]; | |
| 1594 // } | |
| 1595 // | |
| 1596 bool VM_RedefineClasses::rewrite_cp_refs_in_annotations_typeArray( | |
| 1597 typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) { | |
| 1598 | |
| 1599 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1600 // not enough room for num_annotations field | |
| 1601 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1602 ("length() is too small for num_annotations field")); | |
| 1603 return false; | |
| 1604 } | |
| 1605 | |
| 1606 u2 num_annotations = Bytes::get_Java_u2((address) | |
| 1607 annotations_typeArray->byte_at_addr(byte_i_ref)); | |
| 1608 byte_i_ref += 2; | |
| 1609 | |
| 1610 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1611 ("num_annotations=%d", num_annotations)); | |
| 1612 | |
| 1613 int calc_num_annotations = 0; | |
| 1614 for (; calc_num_annotations < num_annotations; calc_num_annotations++) { | |
| 1615 if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray, | |
| 1616 byte_i_ref, THREAD)) { | |
| 1617 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1618 ("bad annotation_struct at %d", calc_num_annotations)); | |
| 605 | 1619 // propagate failure back to caller |
| 0 | 1620 return false; |
| 1621 } | |
| 1622 } | |
| 1623 assert(num_annotations == calc_num_annotations, "sanity check"); | |
| 1624 | |
| 1625 return true; | |
| 1626 } // end rewrite_cp_refs_in_annotations_typeArray() | |
| 1627 | |
| 1628 | |
| 1629 // Rewrite constant pool references in the annotation struct portion of | |
| 1630 // an annotations_typeArray. This "structure" is from section 4.8.15 of | |
| 1631 // the 2nd-edition of the VM spec: | |
| 1632 // | |
| 1633 // struct annotation { | |
| 1634 // u2 type_index; | |
| 1635 // u2 num_element_value_pairs; | |
| 1636 // { | |
| 1637 // u2 element_name_index; | |
| 1638 // element_value value; | |
| 1639 // } element_value_pairs[num_element_value_pairs]; | |
| 1640 // } | |
| 1641 // | |
| 1642 bool VM_RedefineClasses::rewrite_cp_refs_in_annotation_struct( | |
| 1643 typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) { | |
| 1644 if ((byte_i_ref + 2 + 2) > annotations_typeArray->length()) { | |
| 1645 // not enough room for smallest annotation_struct | |
| 1646 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1647 ("length() is too small for annotation_struct")); | |
| 1648 return false; | |
| 1649 } | |
| 1650 | |
| 1651 u2 type_index = rewrite_cp_ref_in_annotation_data(annotations_typeArray, | |
| 1652 byte_i_ref, "mapped old type_index=%d", THREAD); | |
| 1653 | |
| 1654 u2 num_element_value_pairs = Bytes::get_Java_u2((address) | |
| 1655 annotations_typeArray->byte_at_addr( | |
| 1656 byte_i_ref)); | |
| 1657 byte_i_ref += 2; | |
| 1658 | |
| 1659 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1660 ("type_index=%d num_element_value_pairs=%d", type_index, | |
| 1661 num_element_value_pairs)); | |
| 1662 | |
| 1663 int calc_num_element_value_pairs = 0; | |
| 1664 for (; calc_num_element_value_pairs < num_element_value_pairs; | |
| 1665 calc_num_element_value_pairs++) { | |
| 1666 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1667 // not enough room for another element_name_index, let alone | |
| 1668 // the rest of another component | |
| 1669 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1670 ("length() is too small for element_name_index")); | |
| 1671 return false; | |
| 1672 } | |
| 1673 | |
| 1674 u2 element_name_index = rewrite_cp_ref_in_annotation_data( | |
| 1675 annotations_typeArray, byte_i_ref, | |
| 1676 "mapped old element_name_index=%d", THREAD); | |
| 1677 | |
| 1678 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1679 ("element_name_index=%d", element_name_index)); | |
| 1680 | |
| 1681 if (!rewrite_cp_refs_in_element_value(annotations_typeArray, | |
| 1682 byte_i_ref, THREAD)) { | |
| 1683 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1684 ("bad element_value at %d", calc_num_element_value_pairs)); | |
| 605 | 1685 // propagate failure back to caller |
| 0 | 1686 return false; |
| 1687 } | |
| 1688 } // end for each component | |
| 1689 assert(num_element_value_pairs == calc_num_element_value_pairs, | |
| 1690 "sanity check"); | |
| 1691 | |
| 1692 return true; | |
| 1693 } // end rewrite_cp_refs_in_annotation_struct() | |
| 1694 | |
| 1695 | |
| 1696 // Rewrite a constant pool reference at the current position in | |
| 1697 // annotations_typeArray if needed. Returns the original constant | |
| 1698 // pool reference if a rewrite was not needed or the new constant | |
| 1699 // pool reference if a rewrite was needed. | |
| 1700 u2 VM_RedefineClasses::rewrite_cp_ref_in_annotation_data( | |
| 1701 typeArrayHandle annotations_typeArray, int &byte_i_ref, | |
| 1702 const char * trace_mesg, TRAPS) { | |
| 1703 | |
| 1704 address cp_index_addr = (address) | |
| 1705 annotations_typeArray->byte_at_addr(byte_i_ref); | |
| 1706 u2 old_cp_index = Bytes::get_Java_u2(cp_index_addr); | |
| 1707 u2 new_cp_index = find_new_index(old_cp_index); | |
| 1708 if (new_cp_index != 0) { | |
| 1709 RC_TRACE_WITH_THREAD(0x02000000, THREAD, (trace_mesg, old_cp_index)); | |
| 1710 Bytes::put_Java_u2(cp_index_addr, new_cp_index); | |
| 1711 old_cp_index = new_cp_index; | |
| 1712 } | |
| 1713 byte_i_ref += 2; | |
| 1714 return old_cp_index; | |
| 1715 } | |
| 1716 | |
| 1717 | |
| 1718 // Rewrite constant pool references in the element_value portion of an | |
| 1719 // annotations_typeArray. This "structure" is from section 4.8.15.1 of | |
| 1720 // the 2nd-edition of the VM spec: | |
| 1721 // | |
| 1722 // struct element_value { | |
| 1723 // u1 tag; | |
| 1724 // union { | |
| 1725 // u2 const_value_index; | |
| 1726 // { | |
| 1727 // u2 type_name_index; | |
| 1728 // u2 const_name_index; | |
| 1729 // } enum_const_value; | |
| 1730 // u2 class_info_index; | |
| 1731 // annotation annotation_value; | |
| 1732 // struct { | |
| 1733 // u2 num_values; | |
| 1734 // element_value values[num_values]; | |
| 1735 // } array_value; | |
| 1736 // } value; | |
| 1737 // } | |
| 1738 // | |
| 1739 bool VM_RedefineClasses::rewrite_cp_refs_in_element_value( | |
| 1740 typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) { | |
| 1741 | |
| 1742 if ((byte_i_ref + 1) > annotations_typeArray->length()) { | |
| 1743 // not enough room for a tag let alone the rest of an element_value | |
| 1744 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1745 ("length() is too small for a tag")); | |
| 1746 return false; | |
| 1747 } | |
| 1748 | |
| 1749 u1 tag = annotations_typeArray->byte_at(byte_i_ref); | |
| 1750 byte_i_ref++; | |
| 1751 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("tag='%c'", tag)); | |
| 1752 | |
| 1753 switch (tag) { | |
| 1754 // These BaseType tag values are from Table 4.2 in VM spec: | |
| 1755 case 'B': // byte | |
| 1756 case 'C': // char | |
| 1757 case 'D': // double | |
| 1758 case 'F': // float | |
| 1759 case 'I': // int | |
| 1760 case 'J': // long | |
| 1761 case 'S': // short | |
| 1762 case 'Z': // boolean | |
| 1763 | |
| 1764 // The remaining tag values are from Table 4.8 in the 2nd-edition of | |
| 1765 // the VM spec: | |
| 1766 case 's': | |
| 1767 { | |
| 1768 // For the above tag values (including the BaseType values), | |
| 1769 // value.const_value_index is right union field. | |
| 1770 | |
| 1771 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1772 // not enough room for a const_value_index | |
| 1773 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1774 ("length() is too small for a const_value_index")); | |
| 1775 return false; | |
| 1776 } | |
| 1777 | |
| 1778 u2 const_value_index = rewrite_cp_ref_in_annotation_data( | |
| 1779 annotations_typeArray, byte_i_ref, | |
| 1780 "mapped old const_value_index=%d", THREAD); | |
| 1781 | |
| 1782 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1783 ("const_value_index=%d", const_value_index)); | |
| 1784 } break; | |
| 1785 | |
| 1786 case 'e': | |
| 1787 { | |
| 1788 // for the above tag value, value.enum_const_value is right union field | |
| 1789 | |
| 1790 if ((byte_i_ref + 4) > annotations_typeArray->length()) { | |
| 1791 // not enough room for a enum_const_value | |
| 1792 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1793 ("length() is too small for a enum_const_value")); | |
| 1794 return false; | |
| 1795 } | |
| 1796 | |
| 1797 u2 type_name_index = rewrite_cp_ref_in_annotation_data( | |
| 1798 annotations_typeArray, byte_i_ref, | |
| 1799 "mapped old type_name_index=%d", THREAD); | |
| 1800 | |
| 1801 u2 const_name_index = rewrite_cp_ref_in_annotation_data( | |
| 1802 annotations_typeArray, byte_i_ref, | |
| 1803 "mapped old const_name_index=%d", THREAD); | |
| 1804 | |
| 1805 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1806 ("type_name_index=%d const_name_index=%d", type_name_index, | |
| 1807 const_name_index)); | |
| 1808 } break; | |
| 1809 | |
| 1810 case 'c': | |
| 1811 { | |
| 1812 // for the above tag value, value.class_info_index is right union field | |
| 1813 | |
| 1814 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1815 // not enough room for a class_info_index | |
| 1816 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1817 ("length() is too small for a class_info_index")); | |
| 1818 return false; | |
| 1819 } | |
| 1820 | |
| 1821 u2 class_info_index = rewrite_cp_ref_in_annotation_data( | |
| 1822 annotations_typeArray, byte_i_ref, | |
| 1823 "mapped old class_info_index=%d", THREAD); | |
| 1824 | |
| 1825 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1826 ("class_info_index=%d", class_info_index)); | |
| 1827 } break; | |
| 1828 | |
| 1829 case '@': | |
| 1830 // For the above tag value, value.attr_value is the right union | |
| 1831 // field. This is a nested annotation. | |
| 1832 if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray, | |
| 1833 byte_i_ref, THREAD)) { | |
| 605 | 1834 // propagate failure back to caller |
| 0 | 1835 return false; |
| 1836 } | |
| 1837 break; | |
| 1838 | |
| 1839 case '[': | |
| 1840 { | |
| 1841 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1842 // not enough room for a num_values field | |
| 1843 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1844 ("length() is too small for a num_values field")); | |
| 1845 return false; | |
| 1846 } | |
| 1847 | |
| 1848 // For the above tag value, value.array_value is the right union | |
| 1849 // field. This is an array of nested element_value. | |
| 1850 u2 num_values = Bytes::get_Java_u2((address) | |
| 1851 annotations_typeArray->byte_at_addr(byte_i_ref)); | |
| 1852 byte_i_ref += 2; | |
| 1853 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("num_values=%d", num_values)); | |
| 1854 | |
| 1855 int calc_num_values = 0; | |
| 1856 for (; calc_num_values < num_values; calc_num_values++) { | |
| 1857 if (!rewrite_cp_refs_in_element_value( | |
| 1858 annotations_typeArray, byte_i_ref, THREAD)) { | |
| 1859 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1860 ("bad nested element_value at %d", calc_num_values)); | |
| 605 | 1861 // propagate failure back to caller |
| 0 | 1862 return false; |
| 1863 } | |
| 1864 } | |
| 1865 assert(num_values == calc_num_values, "sanity check"); | |
| 1866 } break; | |
| 1867 | |
| 1868 default: | |
| 1869 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("bad tag=0x%x", tag)); | |
| 1870 return false; | |
| 1871 } // end decode tag field | |
| 1872 | |
| 1873 return true; | |
| 1874 } // end rewrite_cp_refs_in_element_value() | |
| 1875 | |
| 1876 | |
| 1877 // Rewrite constant pool references in a fields_annotations field. | |
| 1878 bool VM_RedefineClasses::rewrite_cp_refs_in_fields_annotations( | |
| 1879 instanceKlassHandle scratch_class, TRAPS) { | |
| 1880 | |
| 1881 objArrayHandle fields_annotations(THREAD, | |
| 1882 scratch_class->fields_annotations()); | |
| 1883 | |
| 1884 if (fields_annotations.is_null() || fields_annotations->length() == 0) { | |
| 1885 // no fields_annotations so nothing to do | |
| 1886 return true; | |
| 1887 } | |
| 1888 | |
| 1889 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1890 ("fields_annotations length=%d", fields_annotations->length())); | |
| 1891 | |
| 1892 for (int i = 0; i < fields_annotations->length(); i++) { | |
| 1893 typeArrayHandle field_annotations(THREAD, | |
| 1894 (typeArrayOop)fields_annotations->obj_at(i)); | |
| 1895 if (field_annotations.is_null() || field_annotations->length() == 0) { | |
| 1896 // this field does not have any annotations so skip it | |
| 1897 continue; | |
| 1898 } | |
| 1899 | |
| 1900 int byte_i = 0; // byte index into field_annotations | |
| 1901 if (!rewrite_cp_refs_in_annotations_typeArray(field_annotations, byte_i, | |
| 1902 THREAD)) { | |
| 1903 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1904 ("bad field_annotations at %d", i)); | |
| 605 | 1905 // propagate failure back to caller |
| 0 | 1906 return false; |
| 1907 } | |
| 1908 } | |
| 1909 | |
| 1910 return true; | |
| 1911 } // end rewrite_cp_refs_in_fields_annotations() | |
| 1912 | |
| 1913 | |
| 1914 // Rewrite constant pool references in a methods_annotations field. | |
| 1915 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_annotations( | |
| 1916 instanceKlassHandle scratch_class, TRAPS) { | |
| 1917 | |
| 1918 objArrayHandle methods_annotations(THREAD, | |
| 1919 scratch_class->methods_annotations()); | |
| 1920 | |
| 1921 if (methods_annotations.is_null() || methods_annotations->length() == 0) { | |
| 1922 // no methods_annotations so nothing to do | |
| 1923 return true; | |
| 1924 } | |
| 1925 | |
| 1926 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1927 ("methods_annotations length=%d", methods_annotations->length())); | |
| 1928 | |
| 1929 for (int i = 0; i < methods_annotations->length(); i++) { | |
| 1930 typeArrayHandle method_annotations(THREAD, | |
| 1931 (typeArrayOop)methods_annotations->obj_at(i)); | |
| 1932 if (method_annotations.is_null() || method_annotations->length() == 0) { | |
| 1933 // this method does not have any annotations so skip it | |
| 1934 continue; | |
| 1935 } | |
| 1936 | |
| 1937 int byte_i = 0; // byte index into method_annotations | |
| 1938 if (!rewrite_cp_refs_in_annotations_typeArray(method_annotations, byte_i, | |
| 1939 THREAD)) { | |
| 1940 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1941 ("bad method_annotations at %d", i)); | |
| 605 | 1942 // propagate failure back to caller |
| 0 | 1943 return false; |
| 1944 } | |
| 1945 } | |
| 1946 | |
| 1947 return true; | |
| 1948 } // end rewrite_cp_refs_in_methods_annotations() | |
| 1949 | |
| 1950 | |
| 1951 // Rewrite constant pool references in a methods_parameter_annotations | |
| 1952 // field. This "structure" is adapted from the | |
| 1953 // RuntimeVisibleParameterAnnotations_attribute described in section | |
| 1954 // 4.8.17 of the 2nd-edition of the VM spec: | |
| 1955 // | |
| 1956 // methods_parameter_annotations_typeArray { | |
| 1957 // u1 num_parameters; | |
| 1958 // { | |
| 1959 // u2 num_annotations; | |
| 1960 // annotation annotations[num_annotations]; | |
| 1961 // } parameter_annotations[num_parameters]; | |
| 1962 // } | |
| 1963 // | |
| 1964 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_parameter_annotations( | |
| 1965 instanceKlassHandle scratch_class, TRAPS) { | |
| 1966 | |
| 1967 objArrayHandle methods_parameter_annotations(THREAD, | |
| 1968 scratch_class->methods_parameter_annotations()); | |
| 1969 | |
| 1970 if (methods_parameter_annotations.is_null() | |
| 1971 || methods_parameter_annotations->length() == 0) { | |
| 1972 // no methods_parameter_annotations so nothing to do | |
| 1973 return true; | |
| 1974 } | |
| 1975 | |
| 1976 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1977 ("methods_parameter_annotations length=%d", | |
| 1978 methods_parameter_annotations->length())); | |
| 1979 | |
| 1980 for (int i = 0; i < methods_parameter_annotations->length(); i++) { | |
| 1981 typeArrayHandle method_parameter_annotations(THREAD, | |
| 1982 (typeArrayOop)methods_parameter_annotations->obj_at(i)); | |
| 1983 if (method_parameter_annotations.is_null() | |
| 1984 || method_parameter_annotations->length() == 0) { | |
| 1985 // this method does not have any parameter annotations so skip it | |
| 1986 continue; | |
| 1987 } | |
| 1988 | |
| 1989 if (method_parameter_annotations->length() < 1) { | |
| 1990 // not enough room for a num_parameters field | |
| 1991 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1992 ("length() is too small for a num_parameters field at %d", i)); | |
| 1993 return false; | |
| 1994 } | |
| 1995 | |
| 1996 int byte_i = 0; // byte index into method_parameter_annotations | |
| 1997 | |
| 1998 u1 num_parameters = method_parameter_annotations->byte_at(byte_i); | |
| 1999 byte_i++; | |
| 2000 | |
| 2001 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2002 ("num_parameters=%d", num_parameters)); | |
| 2003 | |
| 2004 int calc_num_parameters = 0; | |
| 2005 for (; calc_num_parameters < num_parameters; calc_num_parameters++) { | |
| 2006 if (!rewrite_cp_refs_in_annotations_typeArray( | |
| 2007 method_parameter_annotations, byte_i, THREAD)) { | |
| 2008 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2009 ("bad method_parameter_annotations at %d", calc_num_parameters)); | |
| 605 | 2010 // propagate failure back to caller |
| 0 | 2011 return false; |
| 2012 } | |
| 2013 } | |
| 2014 assert(num_parameters == calc_num_parameters, "sanity check"); | |
| 2015 } | |
| 2016 | |
| 2017 return true; | |
| 2018 } // end rewrite_cp_refs_in_methods_parameter_annotations() | |
| 2019 | |
| 2020 | |
| 2021 // Rewrite constant pool references in a methods_default_annotations | |
| 2022 // field. This "structure" is adapted from the AnnotationDefault_attribute | |
| 2023 // that is described in section 4.8.19 of the 2nd-edition of the VM spec: | |
| 2024 // | |
| 2025 // methods_default_annotations_typeArray { | |
| 2026 // element_value default_value; | |
| 2027 // } | |
| 2028 // | |
| 2029 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_default_annotations( | |
| 2030 instanceKlassHandle scratch_class, TRAPS) { | |
| 2031 | |
| 2032 objArrayHandle methods_default_annotations(THREAD, | |
| 2033 scratch_class->methods_default_annotations()); | |
| 2034 | |
| 2035 if (methods_default_annotations.is_null() | |
| 2036 || methods_default_annotations->length() == 0) { | |
| 2037 // no methods_default_annotations so nothing to do | |
| 2038 return true; | |
| 2039 } | |
| 2040 | |
| 2041 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2042 ("methods_default_annotations length=%d", | |
| 2043 methods_default_annotations->length())); | |
| 2044 | |
| 2045 for (int i = 0; i < methods_default_annotations->length(); i++) { | |
| 2046 typeArrayHandle method_default_annotations(THREAD, | |
| 2047 (typeArrayOop)methods_default_annotations->obj_at(i)); | |
| 2048 if (method_default_annotations.is_null() | |
| 2049 || method_default_annotations->length() == 0) { | |
| 2050 // this method does not have any default annotations so skip it | |
| 2051 continue; | |
| 2052 } | |
| 2053 | |
| 2054 int byte_i = 0; // byte index into method_default_annotations | |
| 2055 | |
| 2056 if (!rewrite_cp_refs_in_element_value( | |
| 2057 method_default_annotations, byte_i, THREAD)) { | |
| 2058 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2059 ("bad default element_value at %d", i)); | |
| 605 | 2060 // propagate failure back to caller |
| 0 | 2061 return false; |
| 2062 } | |
| 2063 } | |
| 2064 | |
| 2065 return true; | |
| 2066 } // end rewrite_cp_refs_in_methods_default_annotations() | |
| 2067 | |
| 2068 | |
| 2069 // Rewrite constant pool references in the method's stackmap table. | |
| 2070 // These "structures" are adapted from the StackMapTable_attribute that | |
| 2071 // is described in section 4.8.4 of the 6.0 version of the VM spec | |
| 2072 // (dated 2005.10.26): | |
| 2073 // file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf | |
| 2074 // | |
| 2075 // stack_map { | |
| 2076 // u2 number_of_entries; | |
| 2077 // stack_map_frame entries[number_of_entries]; | |
| 2078 // } | |
| 2079 // | |
| 2080 void VM_RedefineClasses::rewrite_cp_refs_in_stack_map_table( | |
| 2081 methodHandle method, TRAPS) { | |
| 2082 | |
| 2083 if (!method->has_stackmap_table()) { | |
| 2084 return; | |
| 2085 } | |
| 2086 | |
| 2087 typeArrayOop stackmap_data = method->stackmap_data(); | |
| 2088 address stackmap_p = (address)stackmap_data->byte_at_addr(0); | |
| 2089 address stackmap_end = stackmap_p + stackmap_data->length(); | |
| 2090 | |
| 2091 assert(stackmap_p + 2 <= stackmap_end, "no room for number_of_entries"); | |
| 2092 u2 number_of_entries = Bytes::get_Java_u2(stackmap_p); | |
| 2093 stackmap_p += 2; | |
| 2094 | |
| 2095 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2096 ("number_of_entries=%u", number_of_entries)); | |
| 2097 | |
| 2098 // walk through each stack_map_frame | |
| 2099 u2 calc_number_of_entries = 0; | |
| 2100 for (; calc_number_of_entries < number_of_entries; calc_number_of_entries++) { | |
| 2101 // The stack_map_frame structure is a u1 frame_type followed by | |
| 2102 // 0 or more bytes of data: | |
| 2103 // | |
| 2104 // union stack_map_frame { | |
| 2105 // same_frame; | |
| 2106 // same_locals_1_stack_item_frame; | |
| 2107 // same_locals_1_stack_item_frame_extended; | |
| 2108 // chop_frame; | |
| 2109 // same_frame_extended; | |
| 2110 // append_frame; | |
| 2111 // full_frame; | |
| 2112 // } | |
| 2113 | |
| 2114 assert(stackmap_p + 1 <= stackmap_end, "no room for frame_type"); | |
| 2115 // The Linux compiler does not like frame_type to be u1 or u2. It | |
| 2116 // issues the following warning for the first if-statement below: | |
| 2117 // | |
| 2118 // "warning: comparison is always true due to limited range of data type" | |
| 2119 // | |
| 2120 u4 frame_type = *stackmap_p; | |
| 2121 stackmap_p++; | |
| 2122 | |
| 2123 // same_frame { | |
| 2124 // u1 frame_type = SAME; /* 0-63 */ | |
| 2125 // } | |
| 2126 if (frame_type >= 0 && frame_type <= 63) { | |
| 2127 // nothing more to do for same_frame | |
| 2128 } | |
| 2129 | |
| 2130 // same_locals_1_stack_item_frame { | |
| 2131 // u1 frame_type = SAME_LOCALS_1_STACK_ITEM; /* 64-127 */ | |
| 2132 // verification_type_info stack[1]; | |
| 2133 // } | |
| 2134 else if (frame_type >= 64 && frame_type <= 127) { | |
| 2135 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2136 calc_number_of_entries, frame_type, THREAD); | |
| 2137 } | |
| 2138 | |
| 2139 // reserved for future use | |
| 2140 else if (frame_type >= 128 && frame_type <= 246) { | |
| 2141 // nothing more to do for reserved frame_types | |
| 2142 } | |
| 2143 | |
| 2144 // same_locals_1_stack_item_frame_extended { | |
| 2145 // u1 frame_type = SAME_LOCALS_1_STACK_ITEM_EXTENDED; /* 247 */ | |
| 2146 // u2 offset_delta; | |
| 2147 // verification_type_info stack[1]; | |
| 2148 // } | |
| 2149 else if (frame_type == 247) { | |
| 2150 stackmap_p += 2; | |
| 2151 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2152 calc_number_of_entries, frame_type, THREAD); | |
| 2153 } | |
| 2154 | |
| 2155 // chop_frame { | |
| 2156 // u1 frame_type = CHOP; /* 248-250 */ | |
| 2157 // u2 offset_delta; | |
| 2158 // } | |
| 2159 else if (frame_type >= 248 && frame_type <= 250) { | |
| 2160 stackmap_p += 2; | |
| 2161 } | |
| 2162 | |
| 2163 // same_frame_extended { | |
| 2164 // u1 frame_type = SAME_FRAME_EXTENDED; /* 251*/ | |
| 2165 // u2 offset_delta; | |
| 2166 // } | |
| 2167 else if (frame_type == 251) { | |
| 2168 stackmap_p += 2; | |
| 2169 } | |
| 2170 | |
| 2171 // append_frame { | |
| 2172 // u1 frame_type = APPEND; /* 252-254 */ | |
| 2173 // u2 offset_delta; | |
| 2174 // verification_type_info locals[frame_type - 251]; | |
| 2175 // } | |
| 2176 else if (frame_type >= 252 && frame_type <= 254) { | |
| 2177 assert(stackmap_p + 2 <= stackmap_end, | |
| 2178 "no room for offset_delta"); | |
| 2179 stackmap_p += 2; | |
| 2180 u1 len = frame_type - 251; | |
| 2181 for (u1 i = 0; i < len; i++) { | |
| 2182 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2183 calc_number_of_entries, frame_type, THREAD); | |
| 2184 } | |
| 2185 } | |
| 2186 | |
| 2187 // full_frame { | |
| 2188 // u1 frame_type = FULL_FRAME; /* 255 */ | |
| 2189 // u2 offset_delta; | |
| 2190 // u2 number_of_locals; | |
| 2191 // verification_type_info locals[number_of_locals]; | |
| 2192 // u2 number_of_stack_items; | |
| 2193 // verification_type_info stack[number_of_stack_items]; | |
| 2194 // } | |
| 2195 else if (frame_type == 255) { | |
| 2196 assert(stackmap_p + 2 + 2 <= stackmap_end, | |
| 2197 "no room for smallest full_frame"); | |
| 2198 stackmap_p += 2; | |
| 2199 | |
| 2200 u2 number_of_locals = Bytes::get_Java_u2(stackmap_p); | |
| 2201 stackmap_p += 2; | |
| 2202 | |
| 2203 for (u2 locals_i = 0; locals_i < number_of_locals; locals_i++) { | |
| 2204 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2205 calc_number_of_entries, frame_type, THREAD); | |
| 2206 } | |
| 2207 | |
| 2208 // Use the largest size for the number_of_stack_items, but only get | |
| 2209 // the right number of bytes. | |
| 2210 u2 number_of_stack_items = Bytes::get_Java_u2(stackmap_p); | |
| 2211 stackmap_p += 2; | |
| 2212 | |
| 2213 for (u2 stack_i = 0; stack_i < number_of_stack_items; stack_i++) { | |
| 2214 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2215 calc_number_of_entries, frame_type, THREAD); | |
| 2216 } | |
| 2217 } | |
| 2218 } // end while there is a stack_map_frame | |
| 2219 assert(number_of_entries == calc_number_of_entries, "sanity check"); | |
| 2220 } // end rewrite_cp_refs_in_stack_map_table() | |
| 2221 | |
| 2222 | |
| 2223 // Rewrite constant pool references in the verification type info | |
| 2224 // portion of the method's stackmap table. These "structures" are | |
| 2225 // adapted from the StackMapTable_attribute that is described in | |
| 2226 // section 4.8.4 of the 6.0 version of the VM spec (dated 2005.10.26): | |
| 2227 // file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf | |
| 2228 // | |
| 2229 // The verification_type_info structure is a u1 tag followed by 0 or | |
| 2230 // more bytes of data: | |
| 2231 // | |
| 2232 // union verification_type_info { | |
| 2233 // Top_variable_info; | |
| 2234 // Integer_variable_info; | |
| 2235 // Float_variable_info; | |
| 2236 // Long_variable_info; | |
| 2237 // Double_variable_info; | |
| 2238 // Null_variable_info; | |
| 2239 // UninitializedThis_variable_info; | |
| 2240 // Object_variable_info; | |
| 2241 // Uninitialized_variable_info; | |
| 2242 // } | |
| 2243 // | |
| 2244 void VM_RedefineClasses::rewrite_cp_refs_in_verification_type_info( | |
| 2245 address& stackmap_p_ref, address stackmap_end, u2 frame_i, | |
| 2246 u1 frame_type, TRAPS) { | |
| 2247 | |
| 2248 assert(stackmap_p_ref + 1 <= stackmap_end, "no room for tag"); | |
| 2249 u1 tag = *stackmap_p_ref; | |
| 2250 stackmap_p_ref++; | |
| 2251 | |
| 2252 switch (tag) { | |
| 2253 // Top_variable_info { | |
| 2254 // u1 tag = ITEM_Top; /* 0 */ | |
| 2255 // } | |
| 2256 // verificationType.hpp has zero as ITEM_Bogus instead of ITEM_Top | |
| 2257 case 0: // fall through | |
| 2258 | |
| 2259 // Integer_variable_info { | |
| 2260 // u1 tag = ITEM_Integer; /* 1 */ | |
| 2261 // } | |
| 2262 case ITEM_Integer: // fall through | |
| 2263 | |
| 2264 // Float_variable_info { | |
| 2265 // u1 tag = ITEM_Float; /* 2 */ | |
| 2266 // } | |
| 2267 case ITEM_Float: // fall through | |
| 2268 | |
| 2269 // Double_variable_info { | |
| 2270 // u1 tag = ITEM_Double; /* 3 */ | |
| 2271 // } | |
| 2272 case ITEM_Double: // fall through | |
| 2273 | |
| 2274 // Long_variable_info { | |
| 2275 // u1 tag = ITEM_Long; /* 4 */ | |
| 2276 // } | |
| 2277 case ITEM_Long: // fall through | |
| 2278 | |
| 2279 // Null_variable_info { | |
| 2280 // u1 tag = ITEM_Null; /* 5 */ | |
| 2281 // } | |
| 2282 case ITEM_Null: // fall through | |
| 2283 | |
| 2284 // UninitializedThis_variable_info { | |
| 2285 // u1 tag = ITEM_UninitializedThis; /* 6 */ | |
| 2286 // } | |
| 2287 case ITEM_UninitializedThis: | |
| 2288 // nothing more to do for the above tag types | |
| 2289 break; | |
| 2290 | |
| 2291 // Object_variable_info { | |
| 2292 // u1 tag = ITEM_Object; /* 7 */ | |
| 2293 // u2 cpool_index; | |
| 2294 // } | |
| 2295 case ITEM_Object: | |
| 2296 { | |
| 2297 assert(stackmap_p_ref + 2 <= stackmap_end, "no room for cpool_index"); | |
| 2298 u2 cpool_index = Bytes::get_Java_u2(stackmap_p_ref); | |
| 2299 u2 new_cp_index = find_new_index(cpool_index); | |
| 2300 if (new_cp_index != 0) { | |
| 2301 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2302 ("mapped old cpool_index=%d", cpool_index)); | |
| 2303 Bytes::put_Java_u2(stackmap_p_ref, new_cp_index); | |
| 2304 cpool_index = new_cp_index; | |
| 2305 } | |
| 2306 stackmap_p_ref += 2; | |
| 2307 | |
| 2308 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2309 ("frame_i=%u, frame_type=%u, cpool_index=%d", frame_i, | |
| 2310 frame_type, cpool_index)); | |
| 2311 } break; | |
| 2312 | |
| 2313 // Uninitialized_variable_info { | |
| 2314 // u1 tag = ITEM_Uninitialized; /* 8 */ | |
| 2315 // u2 offset; | |
| 2316 // } | |
| 2317 case ITEM_Uninitialized: | |
| 2318 assert(stackmap_p_ref + 2 <= stackmap_end, "no room for offset"); | |
| 2319 stackmap_p_ref += 2; | |
| 2320 break; | |
| 2321 | |
| 2322 default: | |
| 2323 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2324 ("frame_i=%u, frame_type=%u, bad tag=0x%x", frame_i, frame_type, tag)); | |
| 2325 ShouldNotReachHere(); | |
| 2326 break; | |
| 2327 } // end switch (tag) | |
| 2328 } // end rewrite_cp_refs_in_verification_type_info() | |
| 2329 | |
| 2330 | |
| 2331 // Change the constant pool associated with klass scratch_class to | |
| 2332 // scratch_cp. If shrink is true, then scratch_cp_length elements | |
| 2333 // are copied from scratch_cp to a smaller constant pool and the | |
| 2334 // smaller constant pool is associated with scratch_class. | |
| 2335 void VM_RedefineClasses::set_new_constant_pool( | |
| 2336 instanceKlassHandle scratch_class, constantPoolHandle scratch_cp, | |
| 2337 int scratch_cp_length, bool shrink, TRAPS) { | |
| 2338 assert(!shrink || scratch_cp->length() >= scratch_cp_length, "sanity check"); | |
| 2339 | |
| 2340 if (shrink) { | |
| 2341 // scratch_cp is a merged constant pool and has enough space for a | |
| 2342 // worst case merge situation. We want to associate the minimum | |
| 2343 // sized constant pool with the klass to save space. | |
| 2344 constantPoolHandle smaller_cp(THREAD, | |
|
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2345 oopFactory::new_constantPool(scratch_cp_length, |
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2346 methodOopDesc::IsUnsafeConc, |
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2347 THREAD)); |
| 0 | 2348 // preserve orig_length() value in the smaller copy |
| 2349 int orig_length = scratch_cp->orig_length(); | |
| 2350 assert(orig_length != 0, "sanity check"); | |
| 2351 smaller_cp->set_orig_length(orig_length); | |
| 2352 scratch_cp->copy_cp_to(1, scratch_cp_length - 1, smaller_cp, 1, THREAD); | |
| 2353 scratch_cp = smaller_cp; | |
|
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2354 smaller_cp()->set_is_conc_safe(true); |
| 0 | 2355 } |
| 2356 | |
| 2357 // attach new constant pool to klass | |
| 2358 scratch_cp->set_pool_holder(scratch_class()); | |
| 2359 | |
| 2360 // attach klass to new constant pool | |
| 2361 scratch_class->set_constants(scratch_cp()); | |
| 2362 | |
| 2363 int i; // for portability | |
| 2364 | |
| 2365 // update each field in klass to use new constant pool indices as needed | |
| 2366 typeArrayHandle fields(THREAD, scratch_class->fields()); | |
| 2367 int n_fields = fields->length(); | |
| 2368 for (i = 0; i < n_fields; i += instanceKlass::next_offset) { | |
| 2369 jshort cur_index = fields->short_at(i + instanceKlass::name_index_offset); | |
| 2370 jshort new_index = find_new_index(cur_index); | |
| 2371 if (new_index != 0) { | |
| 2372 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2373 ("field-name_index change: %d to %d", cur_index, new_index)); | |
| 2374 fields->short_at_put(i + instanceKlass::name_index_offset, new_index); | |
| 2375 } | |
| 2376 cur_index = fields->short_at(i + instanceKlass::signature_index_offset); | |
| 2377 new_index = find_new_index(cur_index); | |
| 2378 if (new_index != 0) { | |
| 2379 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2380 ("field-signature_index change: %d to %d", cur_index, new_index)); | |
| 2381 fields->short_at_put(i + instanceKlass::signature_index_offset, | |
| 2382 new_index); | |
| 2383 } | |
| 2384 cur_index = fields->short_at(i + instanceKlass::initval_index_offset); | |
| 2385 new_index = find_new_index(cur_index); | |
| 2386 if (new_index != 0) { | |
| 2387 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2388 ("field-initval_index change: %d to %d", cur_index, new_index)); | |
| 2389 fields->short_at_put(i + instanceKlass::initval_index_offset, new_index); | |
| 2390 } | |
| 2391 cur_index = fields->short_at(i + instanceKlass::generic_signature_offset); | |
| 2392 new_index = find_new_index(cur_index); | |
| 2393 if (new_index != 0) { | |
| 2394 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2395 ("field-generic_signature change: %d to %d", cur_index, new_index)); | |
| 2396 fields->short_at_put(i + instanceKlass::generic_signature_offset, | |
| 2397 new_index); | |
| 2398 } | |
| 2399 } // end for each field | |
| 2400 | |
| 2401 // Update constant pool indices in the inner classes info to use | |
| 2402 // new constant indices as needed. The inner classes info is a | |
| 2403 // quadruple: | |
| 2404 // (inner_class_info, outer_class_info, inner_name, inner_access_flags) | |
| 2405 typeArrayOop inner_class_list = scratch_class->inner_classes(); | |
| 2406 int icl_length = (inner_class_list == NULL) ? 0 : inner_class_list->length(); | |
| 2407 if (icl_length > 0) { | |
| 2408 typeArrayHandle inner_class_list_h(THREAD, inner_class_list); | |
| 2409 for (int i = 0; i < icl_length; | |
| 2410 i += instanceKlass::inner_class_next_offset) { | |
| 2411 int cur_index = inner_class_list_h->ushort_at(i | |
| 2412 + instanceKlass::inner_class_inner_class_info_offset); | |
| 2413 if (cur_index == 0) { | |
| 2414 continue; // JVM spec. allows null inner class refs so skip it | |
| 2415 } | |
| 2416 int new_index = find_new_index(cur_index); | |
| 2417 if (new_index != 0) { | |
| 2418 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2419 ("inner_class_info change: %d to %d", cur_index, new_index)); | |
| 2420 inner_class_list_h->ushort_at_put(i | |
| 2421 + instanceKlass::inner_class_inner_class_info_offset, new_index); | |
| 2422 } | |
| 2423 cur_index = inner_class_list_h->ushort_at(i | |
| 2424 + instanceKlass::inner_class_outer_class_info_offset); | |
| 2425 new_index = find_new_index(cur_index); | |
| 2426 if (new_index != 0) { | |
| 2427 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2428 ("outer_class_info change: %d to %d", cur_index, new_index)); | |
| 2429 inner_class_list_h->ushort_at_put(i | |
| 2430 + instanceKlass::inner_class_outer_class_info_offset, new_index); | |
| 2431 } | |
| 2432 cur_index = inner_class_list_h->ushort_at(i | |
| 2433 + instanceKlass::inner_class_inner_name_offset); | |
| 2434 new_index = find_new_index(cur_index); | |
| 2435 if (new_index != 0) { | |
| 2436 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2437 ("inner_name change: %d to %d", cur_index, new_index)); | |
| 2438 inner_class_list_h->ushort_at_put(i | |
| 2439 + instanceKlass::inner_class_inner_name_offset, new_index); | |
| 2440 } | |
| 2441 } // end for each inner class | |
| 2442 } // end if we have inner classes | |
| 2443 | |
| 2444 // Attach each method in klass to the new constant pool and update | |
| 2445 // to use new constant pool indices as needed: | |
| 2446 objArrayHandle methods(THREAD, scratch_class->methods()); | |
| 2447 for (i = methods->length() - 1; i >= 0; i--) { | |
| 2448 methodHandle method(THREAD, (methodOop)methods->obj_at(i)); | |
| 2449 method->set_constants(scratch_cp()); | |
| 2450 | |
| 2451 int new_index = find_new_index(method->name_index()); | |
| 2452 if (new_index != 0) { | |
| 2453 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2454 ("method-name_index change: %d to %d", method->name_index(), | |
| 2455 new_index)); | |
| 2456 method->set_name_index(new_index); | |
| 2457 } | |
| 2458 new_index = find_new_index(method->signature_index()); | |
| 2459 if (new_index != 0) { | |
| 2460 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2461 ("method-signature_index change: %d to %d", | |
| 2462 method->signature_index(), new_index)); | |
| 2463 method->set_signature_index(new_index); | |
| 2464 } | |
| 2465 new_index = find_new_index(method->generic_signature_index()); | |
| 2466 if (new_index != 0) { | |
| 2467 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2468 ("method-generic_signature_index change: %d to %d", | |
| 2469 method->generic_signature_index(), new_index)); | |
| 2470 method->set_generic_signature_index(new_index); | |
| 2471 } | |
| 2472 | |
| 2473 // Update constant pool indices in the method's checked exception | |
| 2474 // table to use new constant indices as needed. | |
| 2475 int cext_length = method->checked_exceptions_length(); | |
| 2476 if (cext_length > 0) { | |
| 2477 CheckedExceptionElement * cext_table = | |
| 2478 method->checked_exceptions_start(); | |
| 2479 for (int j = 0; j < cext_length; j++) { | |
| 2480 int cur_index = cext_table[j].class_cp_index; | |
| 2481 int new_index = find_new_index(cur_index); | |
| 2482 if (new_index != 0) { | |
| 2483 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2484 ("cext-class_cp_index change: %d to %d", cur_index, new_index)); | |
| 2485 cext_table[j].class_cp_index = (u2)new_index; | |
| 2486 } | |
| 2487 } // end for each checked exception table entry | |
| 2488 } // end if there are checked exception table entries | |
| 2489 | |
| 2490 // Update each catch type index in the method's exception table | |
| 2491 // to use new constant pool indices as needed. The exception table | |
| 2492 // holds quadruple entries of the form: | |
| 2493 // (beg_bci, end_bci, handler_bci, klass_index) | |
| 2494 const int beg_bci_offset = 0; | |
| 2495 const int end_bci_offset = 1; | |
| 2496 const int handler_bci_offset = 2; | |
| 2497 const int klass_index_offset = 3; | |
| 2498 const int entry_size = 4; | |
| 2499 | |
| 2500 typeArrayHandle ex_table (THREAD, method->exception_table()); | |
| 2501 int ext_length = ex_table->length(); | |
| 2502 assert(ext_length % entry_size == 0, "exception table format has changed"); | |
| 2503 | |
| 2504 for (int j = 0; j < ext_length; j += entry_size) { | |
| 2505 int cur_index = ex_table->int_at(j + klass_index_offset); | |
| 2506 int new_index = find_new_index(cur_index); | |
| 2507 if (new_index != 0) { | |
| 2508 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2509 ("ext-klass_index change: %d to %d", cur_index, new_index)); | |
| 2510 ex_table->int_at_put(j + klass_index_offset, new_index); | |
| 2511 } | |
| 2512 } // end for each exception table entry | |
| 2513 | |
| 2514 // Update constant pool indices in the method's local variable | |
| 2515 // table to use new constant indices as needed. The local variable | |
| 2516 // table hold sextuple entries of the form: | |
| 2517 // (start_pc, length, name_index, descriptor_index, signature_index, slot) | |
| 2518 int lvt_length = method->localvariable_table_length(); | |
| 2519 if (lvt_length > 0) { | |
| 2520 LocalVariableTableElement * lv_table = | |
| 2521 method->localvariable_table_start(); | |
| 2522 for (int j = 0; j < lvt_length; j++) { | |
| 2523 int cur_index = lv_table[j].name_cp_index; | |
| 2524 int new_index = find_new_index(cur_index); | |
| 2525 if (new_index != 0) { | |
| 2526 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2527 ("lvt-name_cp_index change: %d to %d", cur_index, new_index)); | |
| 2528 lv_table[j].name_cp_index = (u2)new_index; | |
| 2529 } | |
| 2530 cur_index = lv_table[j].descriptor_cp_index; | |
| 2531 new_index = find_new_index(cur_index); | |
| 2532 if (new_index != 0) { | |
| 2533 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2534 ("lvt-descriptor_cp_index change: %d to %d", cur_index, | |
| 2535 new_index)); | |
| 2536 lv_table[j].descriptor_cp_index = (u2)new_index; | |
| 2537 } | |
| 2538 cur_index = lv_table[j].signature_cp_index; | |
| 2539 new_index = find_new_index(cur_index); | |
| 2540 if (new_index != 0) { | |
| 2541 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2542 ("lvt-signature_cp_index change: %d to %d", cur_index, new_index)); | |
| 2543 lv_table[j].signature_cp_index = (u2)new_index; | |
| 2544 } | |
| 2545 } // end for each local variable table entry | |
| 2546 } // end if there are local variable table entries | |
| 2547 | |
| 2548 rewrite_cp_refs_in_stack_map_table(method, THREAD); | |
| 2549 } // end for each method | |
|
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2550 assert(scratch_cp()->is_conc_safe(), "Just checking"); |
| 0 | 2551 } // end set_new_constant_pool() |
| 2552 | |
| 2553 | |
| 2554 // Unevolving classes may point to methods of the_class directly | |
| 2555 // from their constant pool caches, itables, and/or vtables. We | |
| 2556 // use the SystemDictionary::classes_do() facility and this helper | |
| 2557 // to fix up these pointers. | |
| 2558 // | |
| 2559 // Note: We currently don't support updating the vtable in | |
| 2560 // arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp. | |
| 2561 void VM_RedefineClasses::adjust_cpool_cache_and_vtable(klassOop k_oop, | |
| 2562 oop initiating_loader, TRAPS) { | |
| 2563 Klass *k = k_oop->klass_part(); | |
| 2564 if (k->oop_is_instance()) { | |
| 2565 HandleMark hm(THREAD); | |
| 2566 instanceKlass *ik = (instanceKlass *) k; | |
| 2567 | |
| 2568 // HotSpot specific optimization! HotSpot does not currently | |
| 2569 // support delegation from the bootstrap class loader to a | |
| 2570 // user-defined class loader. This means that if the bootstrap | |
| 2571 // class loader is the initiating class loader, then it will also | |
| 2572 // be the defining class loader. This also means that classes | |
| 2573 // loaded by the bootstrap class loader cannot refer to classes | |
| 2574 // loaded by a user-defined class loader. Note: a user-defined | |
| 2575 // class loader can delegate to the bootstrap class loader. | |
| 2576 // | |
| 2577 // If the current class being redefined has a user-defined class | |
| 2578 // loader as its defining class loader, then we can skip all | |
| 2579 // classes loaded by the bootstrap class loader. | |
| 2580 bool is_user_defined = | |
| 2581 instanceKlass::cast(_the_class_oop)->class_loader() != NULL; | |
| 2582 if (is_user_defined && ik->class_loader() == NULL) { | |
| 2583 return; | |
| 2584 } | |
| 2585 | |
| 2586 // This is a very busy routine. We don't want too much tracing | |
| 2587 // printed out. | |
| 2588 bool trace_name_printed = false; | |
| 2589 | |
| 2590 // Very noisy: only enable this call if you are trying to determine | |
| 2591 // that a specific class gets found by this routine. | |
| 2592 // RC_TRACE macro has an embedded ResourceMark | |
| 2593 // RC_TRACE_WITH_THREAD(0x00100000, THREAD, | |
| 2594 // ("adjust check: name=%s", ik->external_name())); | |
| 2595 // trace_name_printed = true; | |
| 2596 | |
| 2597 // Fix the vtable embedded in the_class and subclasses of the_class, | |
| 2598 // if one exists. We discard scratch_class and we don't keep an | |
| 2599 // instanceKlass around to hold obsolete methods so we don't have | |
| 2600 // any other instanceKlass embedded vtables to update. The vtable | |
| 2601 // holds the methodOops for virtual (but not final) methods. | |
| 2602 if (ik->vtable_length() > 0 && ik->is_subtype_of(_the_class_oop)) { | |
| 2603 // ik->vtable() creates a wrapper object; rm cleans it up | |
| 2604 ResourceMark rm(THREAD); | |
| 2605 ik->vtable()->adjust_method_entries(_matching_old_methods, | |
| 2606 _matching_new_methods, | |
| 2607 _matching_methods_length, | |
| 2608 &trace_name_printed); | |
| 2609 } | |
| 2610 | |
| 2611 // If the current class has an itable and we are either redefining an | |
| 2612 // interface or if the current class is a subclass of the_class, then | |
| 2613 // we potentially have to fix the itable. If we are redefining an | |
| 2614 // interface, then we have to call adjust_method_entries() for | |
| 2615 // every instanceKlass that has an itable since there isn't a | |
| 2616 // subclass relationship between an interface and an instanceKlass. | |
| 2617 if (ik->itable_length() > 0 && (Klass::cast(_the_class_oop)->is_interface() | |
| 2618 || ik->is_subclass_of(_the_class_oop))) { | |
| 2619 // ik->itable() creates a wrapper object; rm cleans it up | |
| 2620 ResourceMark rm(THREAD); | |
| 2621 ik->itable()->adjust_method_entries(_matching_old_methods, | |
| 2622 _matching_new_methods, | |
| 2623 _matching_methods_length, | |
| 2624 &trace_name_printed); | |
| 2625 } | |
| 2626 | |
| 2627 // The constant pools in other classes (other_cp) can refer to | |
| 2628 // methods in the_class. We have to update method information in | |
| 2629 // other_cp's cache. If other_cp has a previous version, then we | |
| 2630 // have to repeat the process for each previous version. The | |
| 2631 // constant pool cache holds the methodOops for non-virtual | |
| 2632 // methods and for virtual, final methods. | |
| 2633 // | |
| 2634 // Special case: if the current class is the_class, then new_cp | |
| 2635 // has already been attached to the_class and old_cp has already | |
| 2636 // been added as a previous version. The new_cp doesn't have any | |
| 2637 // cached references to old methods so it doesn't need to be | |
| 2638 // updated. We can simply start with the previous version(s) in | |
| 2639 // that case. | |
| 2640 constantPoolHandle other_cp; | |
| 2641 constantPoolCacheOop cp_cache; | |
| 2642 | |
| 2643 if (k_oop != _the_class_oop) { | |
| 2644 // this klass' constant pool cache may need adjustment | |
| 2645 other_cp = constantPoolHandle(ik->constants()); | |
| 2646 cp_cache = other_cp->cache(); | |
| 2647 if (cp_cache != NULL) { | |
| 2648 cp_cache->adjust_method_entries(_matching_old_methods, | |
| 2649 _matching_new_methods, | |
| 2650 _matching_methods_length, | |
| 2651 &trace_name_printed); | |
| 2652 } | |
| 2653 } | |
| 2654 { | |
| 2655 ResourceMark rm(THREAD); | |
| 2656 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 2657 // contain a GrowableArray of handles. We have to clean up the | |
| 2658 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 2659 // has destroyed the handles. | |
| 2660 { | |
| 2661 // the previous versions' constant pool caches may need adjustment | |
| 2662 PreviousVersionWalker pvw(ik); | |
| 2663 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
| 2664 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 2665 other_cp = pv_info->prev_constant_pool_handle(); | |
| 2666 cp_cache = other_cp->cache(); | |
| 2667 if (cp_cache != NULL) { | |
| 2668 cp_cache->adjust_method_entries(_matching_old_methods, | |
| 2669 _matching_new_methods, | |
| 2670 _matching_methods_length, | |
| 2671 &trace_name_printed); | |
| 2672 } | |
| 2673 } | |
| 2674 } // pvw is cleaned up | |
| 2675 } // rm is cleaned up | |
| 2676 } | |
| 2677 } | |
| 2678 | |
| 2679 void VM_RedefineClasses::update_jmethod_ids() { | |
| 2680 for (int j = 0; j < _matching_methods_length; ++j) { | |
| 2681 methodOop old_method = _matching_old_methods[j]; | |
| 2682 jmethodID jmid = old_method->find_jmethod_id_or_null(); | |
| 2683 if (jmid != NULL) { | |
| 2684 // There is a jmethodID, change it to point to the new method | |
| 2685 methodHandle new_method_h(_matching_new_methods[j]); | |
| 2686 JNIHandles::change_method_associated_with_jmethod_id(jmid, new_method_h); | |
| 2687 assert(JNIHandles::resolve_jmethod_id(jmid) == _matching_new_methods[j], | |
| 2688 "should be replaced"); | |
| 2689 } | |
| 2690 } | |
| 2691 } | |
| 2692 | |
| 2693 void VM_RedefineClasses::check_methods_and_mark_as_obsolete( | |
| 2694 BitMap *emcp_methods, int * emcp_method_count_p) { | |
| 2695 *emcp_method_count_p = 0; | |
| 2696 int obsolete_count = 0; | |
| 2697 int old_index = 0; | |
| 2698 for (int j = 0; j < _matching_methods_length; ++j, ++old_index) { | |
| 2699 methodOop old_method = _matching_old_methods[j]; | |
| 2700 methodOop new_method = _matching_new_methods[j]; | |
| 2701 methodOop old_array_method; | |
| 2702 | |
| 2703 // Maintain an old_index into the _old_methods array by skipping | |
| 2704 // deleted methods | |
| 2705 while ((old_array_method = (methodOop) _old_methods->obj_at(old_index)) | |
| 2706 != old_method) { | |
| 2707 ++old_index; | |
| 2708 } | |
| 2709 | |
| 2710 if (MethodComparator::methods_EMCP(old_method, new_method)) { | |
| 2711 // The EMCP definition from JSR-163 requires the bytecodes to be | |
| 2712 // the same with the exception of constant pool indices which may | |
| 2713 // differ. However, the constants referred to by those indices | |
| 2714 // must be the same. | |
| 2715 // | |
| 2716 // We use methods_EMCP() for comparison since constant pool | |
| 2717 // merging can remove duplicate constant pool entries that were | |
| 2718 // present in the old method and removed from the rewritten new | |
| 2719 // method. A faster binary comparison function would consider the | |
| 2720 // old and new methods to be different when they are actually | |
| 2721 // EMCP. | |
| 2722 // | |
| 2723 // The old and new methods are EMCP and you would think that we | |
| 2724 // could get rid of one of them here and now and save some space. | |
| 2725 // However, the concept of EMCP only considers the bytecodes and | |
| 2726 // the constant pool entries in the comparison. Other things, | |
| 2727 // e.g., the line number table (LNT) or the local variable table | |
| 2728 // (LVT) don't count in the comparison. So the new (and EMCP) | |
| 2729 // method can have a new LNT that we need so we can't just | |
| 2730 // overwrite the new method with the old method. | |
| 2731 // | |
| 2732 // When this routine is called, we have already attached the new | |
| 2733 // methods to the_class so the old methods are effectively | |
| 2734 // overwritten. However, if an old method is still executing, | |
| 2735 // then the old method cannot be collected until sometime after | |
| 2736 // the old method call has returned. So the overwriting of old | |
| 2737 // methods by new methods will save us space except for those | |
| 2738 // (hopefully few) old methods that are still executing. | |
| 2739 // | |
| 2740 // A method refers to a constMethodOop and this presents another | |
| 2741 // possible avenue to space savings. The constMethodOop in the | |
| 2742 // new method contains possibly new attributes (LNT, LVT, etc). | |
| 2743 // At first glance, it seems possible to save space by replacing | |
| 2744 // the constMethodOop in the old method with the constMethodOop | |
| 2745 // from the new method. The old and new methods would share the | |
| 2746 // same constMethodOop and we would save the space occupied by | |
| 2747 // the old constMethodOop. However, the constMethodOop contains | |
| 2748 // a back reference to the containing method. Sharing the | |
| 2749 // constMethodOop between two methods could lead to confusion in | |
| 2750 // the code that uses the back reference. This would lead to | |
| 2751 // brittle code that could be broken in non-obvious ways now or | |
| 2752 // in the future. | |
| 2753 // | |
| 2754 // Another possibility is to copy the constMethodOop from the new | |
| 2755 // method to the old method and then overwrite the new method with | |
| 2756 // the old method. Since the constMethodOop contains the bytecodes | |
| 2757 // for the method embedded in the oop, this option would change | |
| 2758 // the bytecodes out from under any threads executing the old | |
| 2759 // method and make the thread's bcp invalid. Since EMCP requires | |
| 2760 // that the bytecodes be the same modulo constant pool indices, it | |
| 2761 // is straight forward to compute the correct new bcp in the new | |
| 2762 // constMethodOop from the old bcp in the old constMethodOop. The | |
| 2763 // time consuming part would be searching all the frames in all | |
| 2764 // of the threads to find all of the calls to the old method. | |
| 2765 // | |
| 2766 // It looks like we will have to live with the limited savings | |
| 2767 // that we get from effectively overwriting the old methods | |
| 2768 // when the new methods are attached to the_class. | |
| 2769 | |
| 2770 // track which methods are EMCP for add_previous_version() call | |
| 2771 emcp_methods->set_bit(old_index); | |
| 2772 (*emcp_method_count_p)++; | |
| 2773 | |
| 2774 // An EMCP method is _not_ obsolete. An obsolete method has a | |
| 2775 // different jmethodID than the current method. An EMCP method | |
| 2776 // has the same jmethodID as the current method. Having the | |
| 2777 // same jmethodID for all EMCP versions of a method allows for | |
| 2778 // a consistent view of the EMCP methods regardless of which | |
| 2779 // EMCP method you happen to have in hand. For example, a | |
| 2780 // breakpoint set in one EMCP method will work for all EMCP | |
| 2781 // versions of the method including the current one. | |
| 2782 } else { | |
| 2783 // mark obsolete methods as such | |
| 2784 old_method->set_is_obsolete(); | |
| 2785 obsolete_count++; | |
| 2786 | |
| 2787 // obsolete methods need a unique idnum | |
| 2788 u2 num = instanceKlass::cast(_the_class_oop)->next_method_idnum(); | |
| 2789 if (num != constMethodOopDesc::UNSET_IDNUM) { | |
| 2790 // u2 old_num = old_method->method_idnum(); | |
| 2791 old_method->set_method_idnum(num); | |
| 2792 // TO DO: attach obsolete annotations to obsolete method's new idnum | |
| 2793 } | |
| 2794 // With tracing we try not to "yack" too much. The position of | |
| 2795 // this trace assumes there are fewer obsolete methods than | |
| 2796 // EMCP methods. | |
| 2797 RC_TRACE(0x00000100, ("mark %s(%s) as obsolete", | |
| 2798 old_method->name()->as_C_string(), | |
| 2799 old_method->signature()->as_C_string())); | |
| 2800 } | |
| 2801 old_method->set_is_old(); | |
| 2802 } | |
| 2803 for (int i = 0; i < _deleted_methods_length; ++i) { | |
| 2804 methodOop old_method = _deleted_methods[i]; | |
| 2805 | |
| 2806 assert(old_method->vtable_index() < 0, | |
| 2807 "cannot delete methods with vtable entries");; | |
| 2808 | |
| 2809 // Mark all deleted methods as old and obsolete | |
| 2810 old_method->set_is_old(); | |
| 2811 old_method->set_is_obsolete(); | |
| 2812 ++obsolete_count; | |
| 2813 // With tracing we try not to "yack" too much. The position of | |
| 2814 // this trace assumes there are fewer obsolete methods than | |
| 2815 // EMCP methods. | |
| 2816 RC_TRACE(0x00000100, ("mark deleted %s(%s) as obsolete", | |
| 2817 old_method->name()->as_C_string(), | |
| 2818 old_method->signature()->as_C_string())); | |
| 2819 } | |
| 2820 assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(), | |
| 2821 "sanity check"); | |
| 2822 RC_TRACE(0x00000100, ("EMCP_cnt=%d, obsolete_cnt=%d", *emcp_method_count_p, | |
| 2823 obsolete_count)); | |
| 2824 } | |
| 2825 | |
| 2826 // This internal class transfers the native function registration from old methods | |
| 2827 // to new methods. It is designed to handle both the simple case of unchanged | |
| 2828 // native methods and the complex cases of native method prefixes being added and/or | |
| 2829 // removed. | |
| 2830 // It expects only to be used during the VM_RedefineClasses op (a safepoint). | |
| 2831 // | |
| 2832 // This class is used after the new methods have been installed in "the_class". | |
| 2833 // | |
| 2834 // So, for example, the following must be handled. Where 'm' is a method and | |
| 2835 // a number followed by an underscore is a prefix. | |
| 2836 // | |
| 2837 // Old Name New Name | |
| 2838 // Simple transfer to new method m -> m | |
| 2839 // Add prefix m -> 1_m | |
| 2840 // Remove prefix 1_m -> m | |
| 2841 // Simultaneous add of prefixes m -> 3_2_1_m | |
| 2842 // Simultaneous removal of prefixes 3_2_1_m -> m | |
| 2843 // Simultaneous add and remove 1_m -> 2_m | |
| 2844 // Same, caused by prefix removal only 3_2_1_m -> 3_2_m | |
| 2845 // | |
| 2846 class TransferNativeFunctionRegistration { | |
| 2847 private: | |
| 2848 instanceKlassHandle the_class; | |
| 2849 int prefix_count; | |
| 2850 char** prefixes; | |
| 2851 | |
| 2852 // Recursively search the binary tree of possibly prefixed method names. | |
| 2853 // Iteration could be used if all agents were well behaved. Full tree walk is | |
| 2854 // more resilent to agents not cleaning up intermediate methods. | |
| 2855 // Branch at each depth in the binary tree is: | |
| 2856 // (1) without the prefix. | |
| 2857 // (2) with the prefix. | |
| 2858 // where 'prefix' is the prefix at that 'depth' (first prefix, second prefix,...) | |
| 2859 methodOop search_prefix_name_space(int depth, char* name_str, size_t name_len, | |
| 2860 symbolOop signature) { | |
| 2861 symbolOop name_symbol = SymbolTable::probe(name_str, (int)name_len); | |
| 2862 if (name_symbol != NULL) { | |
| 2863 methodOop method = Klass::cast(the_class())->lookup_method(name_symbol, signature); | |
| 2864 if (method != NULL) { | |
| 2865 // Even if prefixed, intermediate methods must exist. | |
| 2866 if (method->is_native()) { | |
| 2867 // Wahoo, we found a (possibly prefixed) version of the method, return it. | |
| 2868 return method; | |
| 2869 } | |
| 2870 if (depth < prefix_count) { | |
| 2871 // Try applying further prefixes (other than this one). | |
| 2872 method = search_prefix_name_space(depth+1, name_str, name_len, signature); | |
| 2873 if (method != NULL) { | |
| 2874 return method; // found | |
| 2875 } | |
| 2876 | |
| 2877 // Try adding this prefix to the method name and see if it matches | |
| 2878 // another method name. | |
| 2879 char* prefix = prefixes[depth]; | |
| 2880 size_t prefix_len = strlen(prefix); | |
| 2881 size_t trial_len = name_len + prefix_len; | |
| 2882 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); | |
| 2883 strcpy(trial_name_str, prefix); | |
| 2884 strcat(trial_name_str, name_str); | |
| 2885 method = search_prefix_name_space(depth+1, trial_name_str, trial_len, | |
| 2886 signature); | |
| 2887 if (method != NULL) { | |
| 2888 // If found along this branch, it was prefixed, mark as such | |
| 2889 method->set_is_prefixed_native(); | |
| 2890 return method; // found | |
| 2891 } | |
| 2892 } | |
| 2893 } | |
| 2894 } | |
| 2895 return NULL; // This whole branch bore nothing | |
| 2896 } | |
| 2897 | |
| 2898 // Return the method name with old prefixes stripped away. | |
| 2899 char* method_name_without_prefixes(methodOop method) { | |
| 2900 symbolOop name = method->name(); | |
| 2901 char* name_str = name->as_utf8(); | |
| 2902 | |
| 2903 // Old prefixing may be defunct, strip prefixes, if any. | |
| 2904 for (int i = prefix_count-1; i >= 0; i--) { | |
| 2905 char* prefix = prefixes[i]; | |
| 2906 size_t prefix_len = strlen(prefix); | |
| 2907 if (strncmp(prefix, name_str, prefix_len) == 0) { | |
| 2908 name_str += prefix_len; | |
| 2909 } | |
| 2910 } | |
| 2911 return name_str; | |
| 2912 } | |
| 2913 | |
| 2914 // Strip any prefixes off the old native method, then try to find a | |
| 2915 // (possibly prefixed) new native that matches it. | |
| 2916 methodOop strip_and_search_for_new_native(methodOop method) { | |
| 2917 ResourceMark rm; | |
| 2918 char* name_str = method_name_without_prefixes(method); | |
| 2919 return search_prefix_name_space(0, name_str, strlen(name_str), | |
| 2920 method->signature()); | |
| 2921 } | |
| 2922 | |
| 2923 public: | |
| 2924 | |
| 2925 // Construct a native method transfer processor for this class. | |
| 2926 TransferNativeFunctionRegistration(instanceKlassHandle _the_class) { | |
| 2927 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 2928 | |
| 2929 the_class = _the_class; | |
| 2930 prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); | |
| 2931 } | |
| 2932 | |
| 2933 // Attempt to transfer any of the old or deleted methods that are native | |
| 2934 void transfer_registrations(methodOop* old_methods, int methods_length) { | |
| 2935 for (int j = 0; j < methods_length; j++) { | |
| 2936 methodOop old_method = old_methods[j]; | |
| 2937 | |
| 2938 if (old_method->is_native() && old_method->has_native_function()) { | |
| 2939 methodOop new_method = strip_and_search_for_new_native(old_method); | |
| 2940 if (new_method != NULL) { | |
| 2941 // Actually set the native function in the new method. | |
| 2942 // Redefine does not send events (except CFLH), certainly not this | |
| 2943 // behind the scenes re-registration. | |
| 2944 new_method->set_native_function(old_method->native_function(), | |
| 2945 !methodOopDesc::native_bind_event_is_interesting); | |
| 2946 } | |
| 2947 } | |
| 2948 } | |
| 2949 } | |
| 2950 }; | |
| 2951 | |
| 2952 // Don't lose the association between a native method and its JNI function. | |
| 2953 void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle the_class) { | |
| 2954 TransferNativeFunctionRegistration transfer(the_class); | |
| 2955 transfer.transfer_registrations(_deleted_methods, _deleted_methods_length); | |
| 2956 transfer.transfer_registrations(_matching_old_methods, _matching_methods_length); | |
| 2957 } | |
| 2958 | |
| 2959 // Deoptimize all compiled code that depends on this class. | |
| 2960 // | |
| 2961 // If the can_redefine_classes capability is obtained in the onload | |
| 2962 // phase then the compiler has recorded all dependencies from startup. | |
| 2963 // In that case we need only deoptimize and throw away all compiled code | |
| 2964 // that depends on the class. | |
| 2965 // | |
| 2966 // If can_redefine_classes is obtained sometime after the onload | |
| 2967 // phase then the dependency information may be incomplete. In that case | |
| 2968 // the first call to RedefineClasses causes all compiled code to be | |
| 2969 // thrown away. As can_redefine_classes has been obtained then | |
| 2970 // all future compilations will record dependencies so second and | |
| 2971 // subsequent calls to RedefineClasses need only throw away code | |
| 2972 // that depends on the class. | |
| 2973 // | |
| 2974 void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) { | |
| 2975 assert_locked_or_safepoint(Compile_lock); | |
| 2976 | |
| 2977 // All dependencies have been recorded from startup or this is a second or | |
| 2978 // subsequent use of RedefineClasses | |
| 2979 if (JvmtiExport::all_dependencies_are_recorded()) { | |
| 2980 Universe::flush_evol_dependents_on(k_h); | |
| 2981 } else { | |
| 2982 CodeCache::mark_all_nmethods_for_deoptimization(); | |
| 2983 | |
| 2984 ResourceMark rm(THREAD); | |
| 2985 DeoptimizationMarker dm; | |
| 2986 | |
| 2987 // Deoptimize all activations depending on marked nmethods | |
| 2988 Deoptimization::deoptimize_dependents(); | |
| 2989 | |
| 2990 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 2991 CodeCache::make_marked_nmethods_not_entrant(); | |
| 2992 | |
| 2993 // From now on we know that the dependency information is complete | |
| 2994 JvmtiExport::set_all_dependencies_are_recorded(true); | |
| 2995 } | |
| 2996 } | |
| 2997 | |
| 2998 void VM_RedefineClasses::compute_added_deleted_matching_methods() { | |
| 2999 methodOop old_method; | |
| 3000 methodOop new_method; | |
| 3001 | |
| 3002 _matching_old_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length()); | |
| 3003 _matching_new_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length()); | |
| 3004 _added_methods = NEW_RESOURCE_ARRAY(methodOop, _new_methods->length()); | |
| 3005 _deleted_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length()); | |
| 3006 | |
| 3007 _matching_methods_length = 0; | |
| 3008 _deleted_methods_length = 0; | |
| 3009 _added_methods_length = 0; | |
| 3010 | |
| 3011 int nj = 0; | |
| 3012 int oj = 0; | |
| 3013 while (true) { | |
| 3014 if (oj >= _old_methods->length()) { | |
| 3015 if (nj >= _new_methods->length()) { | |
| 3016 break; // we've looked at everything, done | |
| 3017 } | |
| 3018 // New method at the end | |
| 3019 new_method = (methodOop) _new_methods->obj_at(nj); | |
| 3020 _added_methods[_added_methods_length++] = new_method; | |
| 3021 ++nj; | |
| 3022 } else if (nj >= _new_methods->length()) { | |
| 3023 // Old method, at the end, is deleted | |
| 3024 old_method = (methodOop) _old_methods->obj_at(oj); | |
| 3025 _deleted_methods[_deleted_methods_length++] = old_method; | |
| 3026 ++oj; | |
| 3027 } else { | |
| 3028 old_method = (methodOop) _old_methods->obj_at(oj); | |
| 3029 new_method = (methodOop) _new_methods->obj_at(nj); | |
| 3030 if (old_method->name() == new_method->name()) { | |
| 3031 if (old_method->signature() == new_method->signature()) { | |
| 3032 _matching_old_methods[_matching_methods_length ] = old_method; | |
| 3033 _matching_new_methods[_matching_methods_length++] = new_method; | |
| 3034 ++nj; | |
| 3035 ++oj; | |
| 3036 } else { | |
| 3037 // added overloaded have already been moved to the end, | |
| 3038 // so this is a deleted overloaded method | |
| 3039 _deleted_methods[_deleted_methods_length++] = old_method; | |
| 3040 ++oj; | |
| 3041 } | |
| 3042 } else { // names don't match | |
| 3043 if (old_method->name()->fast_compare(new_method->name()) > 0) { | |
| 3044 // new method | |
| 3045 _added_methods[_added_methods_length++] = new_method; | |
| 3046 ++nj; | |
| 3047 } else { | |
| 3048 // deleted method | |
| 3049 _deleted_methods[_deleted_methods_length++] = old_method; | |
| 3050 ++oj; | |
| 3051 } | |
| 3052 } | |
| 3053 } | |
| 3054 } | |
| 3055 assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity"); | |
| 3056 assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity"); | |
| 3057 } | |
| 3058 | |
| 3059 | |
| 3060 | |
| 3061 // Install the redefinition of a class: | |
| 3062 // - house keeping (flushing breakpoints and caches, deoptimizing | |
| 3063 // dependent compiled code) | |
| 3064 // - replacing parts in the_class with parts from scratch_class | |
| 3065 // - adding a weak reference to track the obsolete but interesting | |
| 3066 // parts of the_class | |
| 3067 // - adjusting constant pool caches and vtables in other classes | |
| 3068 // that refer to methods in the_class. These adjustments use the | |
| 3069 // SystemDictionary::classes_do() facility which only allows | |
| 3070 // a helper method to be specified. The interesting parameters | |
| 3071 // that we would like to pass to the helper method are saved in | |
| 3072 // static global fields in the VM operation. | |
| 3073 void VM_RedefineClasses::redefine_single_class(jclass the_jclass, | |
| 3074 instanceKlassHandle scratch_class, TRAPS) { | |
| 3075 | |
| 3076 RC_TIMER_START(_timer_rsc_phase1); | |
| 3077 | |
| 3078 oop the_class_mirror = JNIHandles::resolve_non_null(the_jclass); | |
| 3079 klassOop the_class_oop = java_lang_Class::as_klassOop(the_class_mirror); | |
| 3080 instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop); | |
| 3081 | |
| 3082 #ifndef JVMTI_KERNEL | |
| 3083 // Remove all breakpoints in methods of this class | |
| 3084 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); | |
| 3085 jvmti_breakpoints.clearall_in_class_at_safepoint(the_class_oop); | |
| 3086 #endif // !JVMTI_KERNEL | |
| 3087 | |
| 3088 if (the_class_oop == Universe::reflect_invoke_cache()->klass()) { | |
| 3089 // We are redefining java.lang.reflect.Method. Method.invoke() is | |
| 3090 // cached and users of the cache care about each active version of | |
| 3091 // the method so we have to track this previous version. | |
| 3092 // Do this before methods get switched | |
| 3093 Universe::reflect_invoke_cache()->add_previous_version( | |
| 3094 the_class->method_with_idnum(Universe::reflect_invoke_cache()->method_idnum())); | |
| 3095 } | |
| 3096 | |
| 3097 // Deoptimize all compiled code that depends on this class | |
| 3098 flush_dependent_code(the_class, THREAD); | |
| 3099 | |
| 3100 _old_methods = the_class->methods(); | |
| 3101 _new_methods = scratch_class->methods(); | |
| 3102 _the_class_oop = the_class_oop; | |
| 3103 compute_added_deleted_matching_methods(); | |
| 3104 update_jmethod_ids(); | |
| 3105 | |
| 3106 // Attach new constant pool to the original klass. The original | |
| 3107 // klass still refers to the old constant pool (for now). | |
| 3108 scratch_class->constants()->set_pool_holder(the_class()); | |
| 3109 | |
| 3110 #if 0 | |
| 3111 // In theory, with constant pool merging in place we should be able | |
| 3112 // to save space by using the new, merged constant pool in place of | |
| 3113 // the old constant pool(s). By "pool(s)" I mean the constant pool in | |
| 3114 // the klass version we are replacing now and any constant pool(s) in | |
| 3115 // previous versions of klass. Nice theory, doesn't work in practice. | |
| 3116 // When this code is enabled, even simple programs throw NullPointer | |
| 3117 // exceptions. I'm guessing that this is caused by some constant pool | |
| 3118 // cache difference between the new, merged constant pool and the | |
| 3119 // constant pool that was just being used by the klass. I'm keeping | |
| 3120 // this code around to archive the idea, but the code has to remain | |
| 3121 // disabled for now. | |
| 3122 | |
| 3123 // Attach each old method to the new constant pool. This can be | |
| 3124 // done here since we are past the bytecode verification and | |
| 3125 // constant pool optimization phases. | |
| 3126 for (int i = _old_methods->length() - 1; i >= 0; i--) { | |
| 3127 methodOop method = (methodOop)_old_methods->obj_at(i); | |
| 3128 method->set_constants(scratch_class->constants()); | |
| 3129 } | |
| 3130 | |
| 3131 { | |
| 3132 // walk all previous versions of the klass | |
| 3133 instanceKlass *ik = (instanceKlass *)the_class()->klass_part(); | |
| 3134 PreviousVersionWalker pvw(ik); | |
| 3135 instanceKlassHandle ikh; | |
| 3136 do { | |
| 3137 ikh = pvw.next_previous_version(); | |
| 3138 if (!ikh.is_null()) { | |
| 3139 ik = ikh(); | |
| 3140 | |
| 3141 // attach previous version of klass to the new constant pool | |
| 3142 ik->set_constants(scratch_class->constants()); | |
| 3143 | |
| 3144 // Attach each method in the previous version of klass to the | |
| 3145 // new constant pool | |
| 3146 objArrayOop prev_methods = ik->methods(); | |
| 3147 for (int i = prev_methods->length() - 1; i >= 0; i--) { | |
| 3148 methodOop method = (methodOop)prev_methods->obj_at(i); | |
| 3149 method->set_constants(scratch_class->constants()); | |
| 3150 } | |
| 3151 } | |
| 3152 } while (!ikh.is_null()); | |
| 3153 } | |
| 3154 #endif | |
| 3155 | |
| 3156 // Replace methods and constantpool | |
| 3157 the_class->set_methods(_new_methods); | |
| 3158 scratch_class->set_methods(_old_methods); // To prevent potential GCing of the old methods, | |
| 3159 // and to be able to undo operation easily. | |
| 3160 | |
| 3161 constantPoolOop old_constants = the_class->constants(); | |
| 3162 the_class->set_constants(scratch_class->constants()); | |
| 3163 scratch_class->set_constants(old_constants); // See the previous comment. | |
| 3164 #if 0 | |
| 3165 // We are swapping the guts of "the new class" with the guts of "the | |
| 3166 // class". Since the old constant pool has just been attached to "the | |
| 3167 // new class", it seems logical to set the pool holder in the old | |
| 3168 // constant pool also. However, doing this will change the observable | |
| 3169 // class hierarchy for any old methods that are still executing. A | |
| 3170 // method can query the identity of its "holder" and this query uses | |
| 3171 // the method's constant pool link to find the holder. The change in | |
| 3172 // holding class from "the class" to "the new class" can confuse | |
| 3173 // things. | |
| 3174 // | |
| 3175 // Setting the old constant pool's holder will also cause | |
| 3176 // verification done during vtable initialization below to fail. | |
| 3177 // During vtable initialization, the vtable's class is verified to be | |
| 3178 // a subtype of the method's holder. The vtable's class is "the | |
| 3179 // class" and the method's holder is gotten from the constant pool | |
| 3180 // link in the method itself. For "the class"'s directly implemented | |
| 3181 // methods, the method holder is "the class" itself (as gotten from | |
| 3182 // the new constant pool). The check works fine in this case. The | |
| 3183 // check also works fine for methods inherited from super classes. | |
| 3184 // | |
| 3185 // Miranda methods are a little more complicated. A miranda method is | |
| 3186 // provided by an interface when the class implementing the interface | |
| 3187 // does not provide its own method. These interfaces are implemented | |
| 3188 // internally as an instanceKlass. These special instanceKlasses | |
| 3189 // share the constant pool of the class that "implements" the | |
| 3190 // interface. By sharing the constant pool, the method holder of a | |
| 3191 // miranda method is the class that "implements" the interface. In a | |
| 3192 // non-redefine situation, the subtype check works fine. However, if | |
| 3193 // the old constant pool's pool holder is modified, then the check | |
| 3194 // fails because there is no class hierarchy relationship between the | |
| 3195 // vtable's class and "the new class". | |
| 3196 | |
| 3197 old_constants->set_pool_holder(scratch_class()); | |
| 3198 #endif | |
| 3199 | |
| 3200 // track which methods are EMCP for add_previous_version() call below | |
| 3201 BitMap emcp_methods(_old_methods->length()); | |
| 3202 int emcp_method_count = 0; | |
| 3203 emcp_methods.clear(); // clears 0..(length() - 1) | |
| 3204 check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count); | |
| 3205 transfer_old_native_function_registrations(the_class); | |
| 3206 | |
| 3207 // The class file bytes from before any retransformable agents mucked | |
| 3208 // with them was cached on the scratch class, move to the_class. | |
| 3209 // Note: we still want to do this if nothing needed caching since it | |
| 3210 // should get cleared in the_class too. | |
| 3211 the_class->set_cached_class_file(scratch_class->get_cached_class_file_bytes(), | |
| 3212 scratch_class->get_cached_class_file_len()); | |
| 3213 | |
| 3214 // Replace inner_classes | |
| 3215 typeArrayOop old_inner_classes = the_class->inner_classes(); | |
| 3216 the_class->set_inner_classes(scratch_class->inner_classes()); | |
| 3217 scratch_class->set_inner_classes(old_inner_classes); | |
| 3218 | |
| 3219 // Initialize the vtable and interface table after | |
| 3220 // methods have been rewritten | |
| 3221 { | |
| 3222 ResourceMark rm(THREAD); | |
| 3223 // no exception should happen here since we explicitly | |
| 3224 // do not check loader constraints. | |
| 3225 // compare_and_normalize_class_versions has already checked: | |
| 3226 // - classloaders unchanged, signatures unchanged | |
| 3227 // - all instanceKlasses for redefined classes reused & contents updated | |
| 3228 the_class->vtable()->initialize_vtable(false, THREAD); | |
| 3229 the_class->itable()->initialize_itable(false, THREAD); | |
| 1142 | 3230 assert(!HAS_PENDING_EXCEPTION || (THREAD->pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())), "redefine exception"); |
| 0 | 3231 } |
| 3232 | |
| 3233 // Leave arrays of jmethodIDs and itable index cache unchanged | |
| 3234 | |
| 3235 // Copy the "source file name" attribute from new class version | |
| 3236 the_class->set_source_file_name(scratch_class->source_file_name()); | |
| 3237 | |
| 3238 // Copy the "source debug extension" attribute from new class version | |
| 3239 the_class->set_source_debug_extension( | |
| 3240 scratch_class->source_debug_extension()); | |
| 3241 | |
| 3242 // Use of javac -g could be different in the old and the new | |
| 3243 if (scratch_class->access_flags().has_localvariable_table() != | |
| 3244 the_class->access_flags().has_localvariable_table()) { | |
| 3245 | |
| 3246 AccessFlags flags = the_class->access_flags(); | |
| 3247 if (scratch_class->access_flags().has_localvariable_table()) { | |
| 3248 flags.set_has_localvariable_table(); | |
| 3249 } else { | |
| 3250 flags.clear_has_localvariable_table(); | |
| 3251 } | |
| 3252 the_class->set_access_flags(flags); | |
| 3253 } | |
| 3254 | |
| 3255 // Replace class annotation fields values | |
| 3256 typeArrayOop old_class_annotations = the_class->class_annotations(); | |
| 3257 the_class->set_class_annotations(scratch_class->class_annotations()); | |
| 3258 scratch_class->set_class_annotations(old_class_annotations); | |
| 3259 | |
| 3260 // Replace fields annotation fields values | |
| 3261 objArrayOop old_fields_annotations = the_class->fields_annotations(); | |
| 3262 the_class->set_fields_annotations(scratch_class->fields_annotations()); | |
| 3263 scratch_class->set_fields_annotations(old_fields_annotations); | |
| 3264 | |
| 3265 // Replace methods annotation fields values | |
| 3266 objArrayOop old_methods_annotations = the_class->methods_annotations(); | |
| 3267 the_class->set_methods_annotations(scratch_class->methods_annotations()); | |
| 3268 scratch_class->set_methods_annotations(old_methods_annotations); | |
| 3269 | |
| 3270 // Replace methods parameter annotation fields values | |
| 3271 objArrayOop old_methods_parameter_annotations = | |
| 3272 the_class->methods_parameter_annotations(); | |
| 3273 the_class->set_methods_parameter_annotations( | |
| 3274 scratch_class->methods_parameter_annotations()); | |
| 3275 scratch_class->set_methods_parameter_annotations(old_methods_parameter_annotations); | |
| 3276 | |
| 3277 // Replace methods default annotation fields values | |
| 3278 objArrayOop old_methods_default_annotations = | |
| 3279 the_class->methods_default_annotations(); | |
| 3280 the_class->set_methods_default_annotations( | |
| 3281 scratch_class->methods_default_annotations()); | |
| 3282 scratch_class->set_methods_default_annotations(old_methods_default_annotations); | |
| 3283 | |
| 3284 // Replace minor version number of class file | |
| 3285 u2 old_minor_version = the_class->minor_version(); | |
| 3286 the_class->set_minor_version(scratch_class->minor_version()); | |
| 3287 scratch_class->set_minor_version(old_minor_version); | |
| 3288 | |
| 3289 // Replace major version number of class file | |
| 3290 u2 old_major_version = the_class->major_version(); | |
| 3291 the_class->set_major_version(scratch_class->major_version()); | |
| 3292 scratch_class->set_major_version(old_major_version); | |
| 3293 | |
| 3294 // Replace CP indexes for class and name+type of enclosing method | |
| 3295 u2 old_class_idx = the_class->enclosing_method_class_index(); | |
| 3296 u2 old_method_idx = the_class->enclosing_method_method_index(); | |
| 3297 the_class->set_enclosing_method_indices( | |
| 3298 scratch_class->enclosing_method_class_index(), | |
| 3299 scratch_class->enclosing_method_method_index()); | |
| 3300 scratch_class->set_enclosing_method_indices(old_class_idx, old_method_idx); | |
| 3301 | |
| 3302 // keep track of previous versions of this class | |
| 3303 the_class->add_previous_version(scratch_class, &emcp_methods, | |
| 3304 emcp_method_count); | |
| 3305 | |
| 3306 RC_TIMER_STOP(_timer_rsc_phase1); | |
| 3307 RC_TIMER_START(_timer_rsc_phase2); | |
| 3308 | |
| 3309 // Adjust constantpool caches and vtables for all classes | |
| 3310 // that reference methods of the evolved class. | |
| 3311 SystemDictionary::classes_do(adjust_cpool_cache_and_vtable, THREAD); | |
| 3312 | |
| 3313 if (the_class->oop_map_cache() != NULL) { | |
| 3314 // Flush references to any obsolete methods from the oop map cache | |
| 3315 // so that obsolete methods are not pinned. | |
| 3316 the_class->oop_map_cache()->flush_obsolete_entries(); | |
| 3317 } | |
| 3318 | |
| 3319 // increment the classRedefinedCount field in the_class and in any | |
| 3320 // direct and indirect subclasses of the_class | |
| 3321 increment_class_counter((instanceKlass *)the_class()->klass_part(), THREAD); | |
| 3322 | |
| 3323 // RC_TRACE macro has an embedded ResourceMark | |
| 3324 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
| 3325 ("redefined name=%s, count=%d (avail_mem=" UINT64_FORMAT "K)", | |
| 3326 the_class->external_name(), | |
| 3327 java_lang_Class::classRedefinedCount(the_class_mirror), | |
| 3328 os::available_memory() >> 10)); | |
| 3329 | |
| 3330 RC_TIMER_STOP(_timer_rsc_phase2); | |
| 3331 } // end redefine_single_class() | |
| 3332 | |
| 3333 | |
| 3334 // Increment the classRedefinedCount field in the specific instanceKlass | |
| 3335 // and in all direct and indirect subclasses. | |
| 3336 void VM_RedefineClasses::increment_class_counter(instanceKlass *ik, TRAPS) { | |
| 3337 oop class_mirror = ik->java_mirror(); | |
| 3338 klassOop class_oop = java_lang_Class::as_klassOop(class_mirror); | |
| 3339 int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1; | |
| 3340 java_lang_Class::set_classRedefinedCount(class_mirror, new_count); | |
| 3341 | |
| 3342 if (class_oop != _the_class_oop) { | |
| 3343 // _the_class_oop count is printed at end of redefine_single_class() | |
| 3344 RC_TRACE_WITH_THREAD(0x00000008, THREAD, | |
| 3345 ("updated count in subclass=%s to %d", ik->external_name(), new_count)); | |
| 3346 } | |
| 3347 | |
| 3348 for (Klass *subk = ik->subklass(); subk != NULL; | |
| 3349 subk = subk->next_sibling()) { | |
| 3350 klassOop sub = subk->as_klassOop(); | |
| 3351 instanceKlass *subik = (instanceKlass *)sub->klass_part(); | |
| 3352 | |
| 3353 // recursively do subclasses of the current subclass | |
| 3354 increment_class_counter(subik, THREAD); | |
| 3355 } | |
| 3356 } | |
| 3357 | |
| 3358 #ifndef PRODUCT | |
| 3359 void VM_RedefineClasses::check_class(klassOop k_oop, | |
| 3360 oop initiating_loader, TRAPS) { | |
| 3361 Klass *k = k_oop->klass_part(); | |
| 3362 if (k->oop_is_instance()) { | |
| 3363 HandleMark hm(THREAD); | |
| 3364 instanceKlass *ik = (instanceKlass *) k; | |
| 3365 | |
| 3366 if (ik->vtable_length() > 0) { | |
| 3367 ResourceMark rm(THREAD); | |
| 3368 if (!ik->vtable()->check_no_old_entries()) { | |
| 3369 tty->print_cr("klassVtable::check_no_old_entries failure -- OLD method found -- class: %s", ik->signature_name()); | |
| 3370 ik->vtable()->dump_vtable(); | |
| 3371 dump_methods(); | |
| 3372 assert(false, "OLD method found"); | |
| 3373 } | |
| 3374 } | |
| 3375 } | |
| 3376 } | |
| 3377 | |
| 3378 void VM_RedefineClasses::dump_methods() { | |
| 3379 int j; | |
| 3380 tty->print_cr("_old_methods --"); | |
| 3381 for (j = 0; j < _old_methods->length(); ++j) { | |
| 3382 methodOop m = (methodOop) _old_methods->obj_at(j); | |
| 3383 tty->print("%4d (%5d) ", j, m->vtable_index()); | |
| 3384 m->access_flags().print_on(tty); | |
| 3385 tty->print(" -- "); | |
| 3386 m->print_name(tty); | |
| 3387 tty->cr(); | |
| 3388 } | |
| 3389 tty->print_cr("_new_methods --"); | |
| 3390 for (j = 0; j < _new_methods->length(); ++j) { | |
| 3391 methodOop m = (methodOop) _new_methods->obj_at(j); | |
| 3392 tty->print("%4d (%5d) ", j, m->vtable_index()); | |
| 3393 m->access_flags().print_on(tty); | |
| 3394 tty->print(" -- "); | |
| 3395 m->print_name(tty); | |
| 3396 tty->cr(); | |
| 3397 } | |
| 3398 tty->print_cr("_matching_(old/new)_methods --"); | |
| 3399 for (j = 0; j < _matching_methods_length; ++j) { | |
| 3400 methodOop m = _matching_old_methods[j]; | |
| 3401 tty->print("%4d (%5d) ", j, m->vtable_index()); | |
| 3402 m->access_flags().print_on(tty); | |
| 3403 tty->print(" -- "); | |
| 3404 m->print_name(tty); | |
| 3405 tty->cr(); | |
| 3406 m = _matching_new_methods[j]; | |
| 3407 tty->print(" (%5d) ", m->vtable_index()); | |
| 3408 m->access_flags().print_on(tty); | |
| 3409 tty->cr(); | |
| 3410 } | |
| 3411 tty->print_cr("_deleted_methods --"); | |
| 3412 for (j = 0; j < _deleted_methods_length; ++j) { | |
| 3413 methodOop m = _deleted_methods[j]; | |
| 3414 tty->print("%4d (%5d) ", j, m->vtable_index()); | |
| 3415 m->access_flags().print_on(tty); | |
| 3416 tty->print(" -- "); | |
| 3417 m->print_name(tty); | |
| 3418 tty->cr(); | |
| 3419 } | |
| 3420 tty->print_cr("_added_methods --"); | |
| 3421 for (j = 0; j < _added_methods_length; ++j) { | |
| 3422 methodOop m = _added_methods[j]; | |
| 3423 tty->print("%4d (%5d) ", j, m->vtable_index()); | |
| 3424 m->access_flags().print_on(tty); | |
| 3425 tty->print(" -- "); | |
| 3426 m->print_name(tty); | |
| 3427 tty->cr(); | |
| 3428 } | |
| 3429 } | |
| 3430 #endif |