Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiRedefineClasses.cpp @ 7951:8b46b0196eb0
8000692: Remove old KERNEL code
Summary: Removed depreciated kernel VM source code from hotspot VM
Reviewed-by: dholmes, acorn
| author | zgu |
|---|---|
| date | Fri, 25 Jan 2013 10:04:08 -0500 |
| parents | 5daaddd917a1 |
| children | 8d1fb417a42d |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2013, 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" |
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26 #include "classfile/metadataOnStackMark.hpp" |
| 1972 | 27 #include "classfile/systemDictionary.hpp" |
| 28 #include "classfile/verifier.hpp" | |
| 29 #include "code/codeCache.hpp" | |
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30 #include "compiler/compileBroker.hpp" |
| 1972 | 31 #include "interpreter/oopMapCache.hpp" |
| 32 #include "interpreter/rewriter.hpp" | |
| 33 #include "memory/gcLocker.hpp" | |
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34 #include "memory/metadataFactory.hpp" |
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35 #include "memory/metaspaceShared.hpp" |
| 1972 | 36 #include "memory/universe.inline.hpp" |
| 3938 | 37 #include "oops/fieldStreams.hpp" |
| 1972 | 38 #include "oops/klassVtable.hpp" |
| 39 #include "prims/jvmtiImpl.hpp" | |
| 40 #include "prims/jvmtiRedefineClasses.hpp" | |
| 41 #include "prims/methodComparator.hpp" | |
| 42 #include "runtime/deoptimization.hpp" | |
| 43 #include "runtime/relocator.hpp" | |
| 44 #include "utilities/bitMap.inline.hpp" | |
| 0 | 45 |
| 46 | |
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47 Array<Method*>* VM_RedefineClasses::_old_methods = NULL; |
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48 Array<Method*>* VM_RedefineClasses::_new_methods = NULL; |
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49 Method** VM_RedefineClasses::_matching_old_methods = NULL; |
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50 Method** VM_RedefineClasses::_matching_new_methods = NULL; |
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51 Method** VM_RedefineClasses::_deleted_methods = NULL; |
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52 Method** VM_RedefineClasses::_added_methods = NULL; |
| 0 | 53 int VM_RedefineClasses::_matching_methods_length = 0; |
| 54 int VM_RedefineClasses::_deleted_methods_length = 0; | |
| 55 int VM_RedefineClasses::_added_methods_length = 0; | |
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56 Klass* VM_RedefineClasses::_the_class_oop = NULL; |
| 0 | 57 |
| 58 | |
| 59 VM_RedefineClasses::VM_RedefineClasses(jint class_count, | |
| 60 const jvmtiClassDefinition *class_defs, | |
| 61 JvmtiClassLoadKind class_load_kind) { | |
| 62 _class_count = class_count; | |
| 63 _class_defs = class_defs; | |
| 64 _class_load_kind = class_load_kind; | |
| 65 _res = JVMTI_ERROR_NONE; | |
| 66 } | |
| 67 | |
| 68 bool VM_RedefineClasses::doit_prologue() { | |
| 69 if (_class_count == 0) { | |
| 70 _res = JVMTI_ERROR_NONE; | |
| 71 return false; | |
| 72 } | |
| 73 if (_class_defs == NULL) { | |
| 74 _res = JVMTI_ERROR_NULL_POINTER; | |
| 75 return false; | |
| 76 } | |
| 77 for (int i = 0; i < _class_count; i++) { | |
| 78 if (_class_defs[i].klass == NULL) { | |
| 79 _res = JVMTI_ERROR_INVALID_CLASS; | |
| 80 return false; | |
| 81 } | |
| 82 if (_class_defs[i].class_byte_count == 0) { | |
| 83 _res = JVMTI_ERROR_INVALID_CLASS_FORMAT; | |
| 84 return false; | |
| 85 } | |
| 86 if (_class_defs[i].class_bytes == NULL) { | |
| 87 _res = JVMTI_ERROR_NULL_POINTER; | |
| 88 return false; | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 // Start timer after all the sanity checks; not quite accurate, but | |
| 93 // better than adding a bunch of stop() calls. | |
| 94 RC_TIMER_START(_timer_vm_op_prologue); | |
| 95 | |
| 96 // We first load new class versions in the prologue, because somewhere down the | |
| 97 // call chain it is required that the current thread is a Java thread. | |
| 98 _res = load_new_class_versions(Thread::current()); | |
| 99 if (_res != JVMTI_ERROR_NONE) { | |
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100 // free any successfully created classes, since none are redefined |
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101 for (int i = 0; i < _class_count; i++) { |
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102 if (_scratch_classes[i] != NULL) { |
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103 ClassLoaderData* cld = _scratch_classes[i]->class_loader_data(); |
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104 // Free the memory for this class at class unloading time. Not before |
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105 // because CMS might think this is still live. |
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106 cld->add_to_deallocate_list((InstanceKlass*)_scratch_classes[i]); |
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107 } |
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108 } |
| 0 | 109 // Free os::malloc allocated memory in load_new_class_version. |
| 110 os::free(_scratch_classes); | |
| 111 RC_TIMER_STOP(_timer_vm_op_prologue); | |
| 112 return false; | |
| 113 } | |
| 114 | |
| 115 RC_TIMER_STOP(_timer_vm_op_prologue); | |
| 116 return true; | |
| 117 } | |
| 118 | |
| 119 void VM_RedefineClasses::doit() { | |
| 120 Thread *thread = Thread::current(); | |
| 121 | |
| 122 if (UseSharedSpaces) { | |
| 123 // Sharing is enabled so we remap the shared readonly space to | |
| 124 // shared readwrite, private just in case we need to redefine | |
| 125 // a shared class. We do the remap during the doit() phase of | |
| 126 // the safepoint to be safer. | |
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127 if (!MetaspaceShared::remap_shared_readonly_as_readwrite()) { |
| 0 | 128 RC_TRACE_WITH_THREAD(0x00000001, thread, |
| 129 ("failed to remap shared readonly space to readwrite, private")); | |
| 130 _res = JVMTI_ERROR_INTERNAL; | |
| 131 return; | |
| 132 } | |
| 133 } | |
| 134 | |
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135 // Mark methods seen on stack and everywhere else so old methods are not |
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136 // cleaned up if they're on the stack. |
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137 MetadataOnStackMark md_on_stack; |
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138 HandleMark hm(thread); // make sure any handles created are deleted |
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139 // before the stack walk again. |
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140 |
| 0 | 141 for (int i = 0; i < _class_count; i++) { |
| 142 redefine_single_class(_class_defs[i].klass, _scratch_classes[i], thread); | |
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143 ClassLoaderData* cld = _scratch_classes[i]->class_loader_data(); |
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144 // Free the memory for this class at class unloading time. Not before |
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145 // because CMS might think this is still live. |
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146 cld->add_to_deallocate_list((InstanceKlass*)_scratch_classes[i]); |
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147 _scratch_classes[i] = NULL; |
| 0 | 148 } |
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149 |
| 0 | 150 // Disable any dependent concurrent compilations |
| 151 SystemDictionary::notice_modification(); | |
| 152 | |
| 153 // Set flag indicating that some invariants are no longer true. | |
| 154 // See jvmtiExport.hpp for detailed explanation. | |
| 155 JvmtiExport::set_has_redefined_a_class(); | |
| 156 | |
| 157 #ifdef ASSERT | |
| 158 SystemDictionary::classes_do(check_class, thread); | |
| 159 #endif | |
| 160 } | |
| 161 | |
| 162 void VM_RedefineClasses::doit_epilogue() { | |
| 163 // Free os::malloc allocated memory. | |
| 164 os::free(_scratch_classes); | |
| 165 | |
| 166 if (RC_TRACE_ENABLED(0x00000004)) { | |
| 167 // Used to have separate timers for "doit" and "all", but the timer | |
| 168 // overhead skewed the measurements. | |
| 169 jlong doit_time = _timer_rsc_phase1.milliseconds() + | |
| 170 _timer_rsc_phase2.milliseconds(); | |
| 171 jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time; | |
| 172 | |
| 173 RC_TRACE(0x00000004, ("vm_op: all=" UINT64_FORMAT | |
| 174 " prologue=" UINT64_FORMAT " doit=" UINT64_FORMAT, all_time, | |
| 175 _timer_vm_op_prologue.milliseconds(), doit_time)); | |
| 176 RC_TRACE(0x00000004, | |
| 177 ("redefine_single_class: phase1=" UINT64_FORMAT " phase2=" UINT64_FORMAT, | |
| 178 _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds())); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) { | |
| 183 // classes for primitives cannot be redefined | |
| 184 if (java_lang_Class::is_primitive(klass_mirror)) { | |
| 185 return false; | |
| 186 } | |
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187 Klass* the_class_oop = java_lang_Class::as_Klass(klass_mirror); |
| 0 | 188 // classes for arrays cannot be redefined |
| 6983 | 189 if (the_class_oop == NULL || !the_class_oop->oop_is_instance()) { |
| 0 | 190 return false; |
| 191 } | |
| 192 return true; | |
| 193 } | |
| 194 | |
| 195 // Append the current entry at scratch_i in scratch_cp to *merge_cp_p | |
| 196 // where the end of *merge_cp_p is specified by *merge_cp_length_p. For | |
| 197 // direct CP entries, there is just the current entry to append. For | |
| 198 // indirect and double-indirect CP entries, there are zero or more | |
| 199 // referenced CP entries along with the current entry to append. | |
| 200 // Indirect and double-indirect CP entries are handled by recursive | |
| 201 // calls to append_entry() as needed. The referenced CP entries are | |
| 202 // always appended to *merge_cp_p before the referee CP entry. These | |
| 203 // referenced CP entries may already exist in *merge_cp_p in which case | |
| 204 // there is nothing extra to append and only the current entry is | |
| 205 // appended. | |
| 206 void VM_RedefineClasses::append_entry(constantPoolHandle scratch_cp, | |
| 207 int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, | |
| 208 TRAPS) { | |
| 209 | |
| 210 // append is different depending on entry tag type | |
| 211 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 212 | |
| 213 // The old verifier is implemented outside the VM. It loads classes, | |
| 214 // but does not resolve constant pool entries directly so we never | |
| 215 // see Class entries here with the old verifier. Similarly the old | |
| 216 // verifier does not like Class entries in the input constant pool. | |
| 217 // The split-verifier is implemented in the VM so it can optionally | |
| 218 // and directly resolve constant pool entries to load classes. The | |
| 219 // split-verifier can accept either Class entries or UnresolvedClass | |
| 220 // entries in the input constant pool. We revert the appended copy | |
| 221 // back to UnresolvedClass so that either verifier will be happy | |
| 222 // with the constant pool entry. | |
| 223 case JVM_CONSTANT_Class: | |
| 224 { | |
| 225 // revert the copy to JVM_CONSTANT_UnresolvedClass | |
| 226 (*merge_cp_p)->unresolved_klass_at_put(*merge_cp_length_p, | |
| 227 scratch_cp->klass_name_at(scratch_i)); | |
| 228 | |
| 229 if (scratch_i != *merge_cp_length_p) { | |
| 230 // The new entry in *merge_cp_p is at a different index than | |
| 231 // the new entry in scratch_cp so we need to map the index values. | |
| 232 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 233 } | |
| 234 (*merge_cp_length_p)++; | |
| 235 } break; | |
| 236 | |
| 237 // these are direct CP entries so they can be directly appended, | |
| 238 // but double and long take two constant pool entries | |
| 239 case JVM_CONSTANT_Double: // fall through | |
| 240 case JVM_CONSTANT_Long: | |
| 241 { | |
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242 ConstantPool::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) += 2; | |
| 251 } break; | |
| 252 | |
| 253 // these are direct CP entries so they can be directly appended | |
| 254 case JVM_CONSTANT_Float: // fall through | |
| 255 case JVM_CONSTANT_Integer: // fall through | |
| 256 case JVM_CONSTANT_Utf8: // fall through | |
| 257 | |
| 258 // This was an indirect CP entry, but it has been changed into | |
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259 // Symbol*s so this entry can be directly appended. |
| 0 | 260 case JVM_CONSTANT_String: // fall through |
| 261 | |
| 262 // These were indirect CP entries, but they have been changed into | |
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263 // Symbol*s so these entries can be directly appended. |
| 0 | 264 case JVM_CONSTANT_UnresolvedClass: // fall through |
| 265 { | |
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266 ConstantPool::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p, |
| 0 | 267 THREAD); |
| 268 | |
| 269 if (scratch_i != *merge_cp_length_p) { | |
| 270 // The new entry in *merge_cp_p is at a different index than | |
| 271 // the new entry in scratch_cp so we need to map the index values. | |
| 272 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 273 } | |
| 274 (*merge_cp_length_p)++; | |
| 275 } break; | |
| 276 | |
| 277 // this is an indirect CP entry so it needs special handling | |
| 278 case JVM_CONSTANT_NameAndType: | |
| 279 { | |
| 280 int name_ref_i = scratch_cp->name_ref_index_at(scratch_i); | |
| 281 int new_name_ref_i = 0; | |
| 282 bool match = (name_ref_i < *merge_cp_length_p) && | |
| 283 scratch_cp->compare_entry_to(name_ref_i, *merge_cp_p, name_ref_i, | |
| 284 THREAD); | |
| 285 if (!match) { | |
| 286 // forward reference in *merge_cp_p or not a direct match | |
| 287 | |
| 288 int found_i = scratch_cp->find_matching_entry(name_ref_i, *merge_cp_p, | |
| 289 THREAD); | |
| 290 if (found_i != 0) { | |
| 291 guarantee(found_i != name_ref_i, | |
| 292 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 293 | |
| 294 // Found a matching entry somewhere else in *merge_cp_p so | |
| 295 // just need a mapping entry. | |
| 296 new_name_ref_i = found_i; | |
| 297 map_index(scratch_cp, name_ref_i, found_i); | |
| 298 } else { | |
| 299 // no match found so we have to append this entry to *merge_cp_p | |
| 300 append_entry(scratch_cp, name_ref_i, merge_cp_p, merge_cp_length_p, | |
| 301 THREAD); | |
| 302 // The above call to append_entry() can only append one entry | |
| 303 // so the post call query of *merge_cp_length_p is only for | |
| 304 // the sake of consistency. | |
| 305 new_name_ref_i = *merge_cp_length_p - 1; | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 int signature_ref_i = scratch_cp->signature_ref_index_at(scratch_i); | |
| 310 int new_signature_ref_i = 0; | |
| 311 match = (signature_ref_i < *merge_cp_length_p) && | |
| 312 scratch_cp->compare_entry_to(signature_ref_i, *merge_cp_p, | |
| 313 signature_ref_i, THREAD); | |
| 314 if (!match) { | |
| 315 // forward reference in *merge_cp_p or not a direct match | |
| 316 | |
| 317 int found_i = scratch_cp->find_matching_entry(signature_ref_i, | |
| 318 *merge_cp_p, THREAD); | |
| 319 if (found_i != 0) { | |
| 320 guarantee(found_i != signature_ref_i, | |
| 321 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 322 | |
| 323 // Found a matching entry somewhere else in *merge_cp_p so | |
| 324 // just need a mapping entry. | |
| 325 new_signature_ref_i = found_i; | |
| 326 map_index(scratch_cp, signature_ref_i, found_i); | |
| 327 } else { | |
| 328 // no match found so we have to append this entry to *merge_cp_p | |
| 329 append_entry(scratch_cp, signature_ref_i, merge_cp_p, | |
| 330 merge_cp_length_p, THREAD); | |
| 331 // The above call to append_entry() can only append one entry | |
| 332 // so the post call query of *merge_cp_length_p is only for | |
| 333 // the sake of consistency. | |
| 334 new_signature_ref_i = *merge_cp_length_p - 1; | |
| 335 } | |
| 336 } | |
| 337 | |
| 338 // If the referenced entries already exist in *merge_cp_p, then | |
| 339 // both new_name_ref_i and new_signature_ref_i will both be 0. | |
| 340 // In that case, all we are appending is the current entry. | |
| 341 if (new_name_ref_i == 0) { | |
| 342 new_name_ref_i = name_ref_i; | |
| 343 } else { | |
| 344 RC_TRACE(0x00080000, | |
| 345 ("NameAndType entry@%d name_ref_index change: %d to %d", | |
| 346 *merge_cp_length_p, name_ref_i, new_name_ref_i)); | |
| 347 } | |
| 348 if (new_signature_ref_i == 0) { | |
| 349 new_signature_ref_i = signature_ref_i; | |
| 350 } else { | |
| 351 RC_TRACE(0x00080000, | |
| 352 ("NameAndType entry@%d signature_ref_index change: %d to %d", | |
| 353 *merge_cp_length_p, signature_ref_i, new_signature_ref_i)); | |
| 354 } | |
| 355 | |
| 356 (*merge_cp_p)->name_and_type_at_put(*merge_cp_length_p, | |
| 357 new_name_ref_i, new_signature_ref_i); | |
| 358 if (scratch_i != *merge_cp_length_p) { | |
| 359 // The new entry in *merge_cp_p is at a different index than | |
| 360 // the new entry in scratch_cp so we need to map the index values. | |
| 361 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 362 } | |
| 363 (*merge_cp_length_p)++; | |
| 364 } break; | |
| 365 | |
| 366 // this is a double-indirect CP entry so it needs special handling | |
| 367 case JVM_CONSTANT_Fieldref: // fall through | |
| 368 case JVM_CONSTANT_InterfaceMethodref: // fall through | |
| 369 case JVM_CONSTANT_Methodref: | |
| 370 { | |
| 371 int klass_ref_i = scratch_cp->uncached_klass_ref_index_at(scratch_i); | |
| 372 int new_klass_ref_i = 0; | |
| 373 bool match = (klass_ref_i < *merge_cp_length_p) && | |
| 374 scratch_cp->compare_entry_to(klass_ref_i, *merge_cp_p, klass_ref_i, | |
| 375 THREAD); | |
| 376 if (!match) { | |
| 377 // forward reference in *merge_cp_p or not a direct match | |
| 378 | |
| 379 int found_i = scratch_cp->find_matching_entry(klass_ref_i, *merge_cp_p, | |
| 380 THREAD); | |
| 381 if (found_i != 0) { | |
| 382 guarantee(found_i != klass_ref_i, | |
| 383 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 384 | |
| 385 // Found a matching entry somewhere else in *merge_cp_p so | |
| 386 // just need a mapping entry. | |
| 387 new_klass_ref_i = found_i; | |
| 388 map_index(scratch_cp, klass_ref_i, found_i); | |
| 389 } else { | |
| 390 // no match found so we have to append this entry to *merge_cp_p | |
| 391 append_entry(scratch_cp, klass_ref_i, merge_cp_p, merge_cp_length_p, | |
| 392 THREAD); | |
| 393 // The above call to append_entry() can only append one entry | |
| 394 // so the post call query of *merge_cp_length_p is only for | |
| 395 // the sake of consistency. Without the optimization where we | |
| 396 // use JVM_CONSTANT_UnresolvedClass, then up to two entries | |
| 397 // could be appended. | |
| 398 new_klass_ref_i = *merge_cp_length_p - 1; | |
| 399 } | |
| 400 } | |
| 401 | |
| 402 int name_and_type_ref_i = | |
| 403 scratch_cp->uncached_name_and_type_ref_index_at(scratch_i); | |
| 404 int new_name_and_type_ref_i = 0; | |
| 405 match = (name_and_type_ref_i < *merge_cp_length_p) && | |
| 406 scratch_cp->compare_entry_to(name_and_type_ref_i, *merge_cp_p, | |
| 407 name_and_type_ref_i, THREAD); | |
| 408 if (!match) { | |
| 409 // forward reference in *merge_cp_p or not a direct match | |
| 410 | |
| 411 int found_i = scratch_cp->find_matching_entry(name_and_type_ref_i, | |
| 412 *merge_cp_p, THREAD); | |
| 413 if (found_i != 0) { | |
| 414 guarantee(found_i != name_and_type_ref_i, | |
| 415 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 416 | |
| 417 // Found a matching entry somewhere else in *merge_cp_p so | |
| 418 // just need a mapping entry. | |
| 419 new_name_and_type_ref_i = found_i; | |
| 420 map_index(scratch_cp, name_and_type_ref_i, found_i); | |
| 421 } else { | |
| 422 // no match found so we have to append this entry to *merge_cp_p | |
| 423 append_entry(scratch_cp, name_and_type_ref_i, merge_cp_p, | |
| 424 merge_cp_length_p, THREAD); | |
| 425 // The above call to append_entry() can append more than | |
| 426 // one entry so the post call query of *merge_cp_length_p | |
| 427 // is required in order to get the right index for the | |
| 428 // JVM_CONSTANT_NameAndType entry. | |
| 429 new_name_and_type_ref_i = *merge_cp_length_p - 1; | |
| 430 } | |
| 431 } | |
| 432 | |
| 433 // If the referenced entries already exist in *merge_cp_p, then | |
| 434 // both new_klass_ref_i and new_name_and_type_ref_i will both be | |
| 435 // 0. In that case, all we are appending is the current entry. | |
| 436 if (new_klass_ref_i == 0) { | |
| 437 new_klass_ref_i = klass_ref_i; | |
| 438 } | |
| 439 if (new_name_and_type_ref_i == 0) { | |
| 440 new_name_and_type_ref_i = name_and_type_ref_i; | |
| 441 } | |
| 442 | |
| 443 const char *entry_name; | |
| 444 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 445 case JVM_CONSTANT_Fieldref: | |
| 446 entry_name = "Fieldref"; | |
| 447 (*merge_cp_p)->field_at_put(*merge_cp_length_p, new_klass_ref_i, | |
| 448 new_name_and_type_ref_i); | |
| 449 break; | |
| 450 case JVM_CONSTANT_InterfaceMethodref: | |
| 451 entry_name = "IFMethodref"; | |
| 452 (*merge_cp_p)->interface_method_at_put(*merge_cp_length_p, | |
| 453 new_klass_ref_i, new_name_and_type_ref_i); | |
| 454 break; | |
| 455 case JVM_CONSTANT_Methodref: | |
| 456 entry_name = "Methodref"; | |
| 457 (*merge_cp_p)->method_at_put(*merge_cp_length_p, new_klass_ref_i, | |
| 458 new_name_and_type_ref_i); | |
| 459 break; | |
| 460 default: | |
| 461 guarantee(false, "bad switch"); | |
| 462 break; | |
| 463 } | |
| 464 | |
| 465 if (klass_ref_i != new_klass_ref_i) { | |
| 466 RC_TRACE(0x00080000, ("%s entry@%d class_index changed: %d to %d", | |
| 467 entry_name, *merge_cp_length_p, klass_ref_i, new_klass_ref_i)); | |
| 468 } | |
| 469 if (name_and_type_ref_i != new_name_and_type_ref_i) { | |
| 470 RC_TRACE(0x00080000, | |
| 471 ("%s entry@%d name_and_type_index changed: %d to %d", | |
| 472 entry_name, *merge_cp_length_p, name_and_type_ref_i, | |
| 473 new_name_and_type_ref_i)); | |
| 474 } | |
| 475 | |
| 476 if (scratch_i != *merge_cp_length_p) { | |
| 477 // The new entry in *merge_cp_p is at a different index than | |
| 478 // the new entry in scratch_cp so we need to map the index values. | |
| 479 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
| 480 } | |
| 481 (*merge_cp_length_p)++; | |
| 482 } break; | |
| 483 | |
| 484 // At this stage, Class or UnresolvedClass could be here, but not | |
| 485 // ClassIndex | |
| 486 case JVM_CONSTANT_ClassIndex: // fall through | |
| 487 | |
| 488 // Invalid is used as the tag for the second constant pool entry | |
| 489 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
| 490 // not be seen by itself. | |
| 491 case JVM_CONSTANT_Invalid: // fall through | |
| 492 | |
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493 // At this stage, String could be here, but not StringIndex |
| 0 | 494 case JVM_CONSTANT_StringIndex: // fall through |
| 495 | |
| 496 // At this stage JVM_CONSTANT_UnresolvedClassInError should not be | |
| 497 // here | |
| 498 case JVM_CONSTANT_UnresolvedClassInError: // fall through | |
| 499 | |
| 500 default: | |
| 501 { | |
| 502 // leave a breadcrumb | |
| 503 jbyte bad_value = scratch_cp->tag_at(scratch_i).value(); | |
| 504 ShouldNotReachHere(); | |
| 505 } break; | |
| 506 } // end switch tag value | |
| 507 } // end append_entry() | |
| 508 | |
| 509 | |
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510 void VM_RedefineClasses::swap_all_method_annotations(int i, int j, instanceKlassHandle scratch_class, TRAPS) { |
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511 AnnotationArray* save; |
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512 |
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513 Annotations* sca = scratch_class->annotations(); |
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514 if (sca == NULL) return; |
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515 |
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516 save = sca->get_method_annotations_of(i); |
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517 sca->set_method_annotations_of(scratch_class, i, sca->get_method_annotations_of(j), CHECK); |
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518 sca->set_method_annotations_of(scratch_class, j, save, CHECK); |
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519 |
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520 save = sca->get_method_parameter_annotations_of(i); |
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521 sca->set_method_parameter_annotations_of(scratch_class, i, sca->get_method_parameter_annotations_of(j), CHECK); |
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522 sca->set_method_parameter_annotations_of(scratch_class, j, save, CHECK); |
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523 |
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524 save = sca->get_method_default_annotations_of(i); |
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525 sca->set_method_default_annotations_of(scratch_class, i, sca->get_method_default_annotations_of(j), CHECK); |
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526 sca->set_method_default_annotations_of(scratch_class, j, save, CHECK); |
| 0 | 527 } |
| 528 | |
| 529 | |
| 530 jvmtiError VM_RedefineClasses::compare_and_normalize_class_versions( | |
| 531 instanceKlassHandle the_class, | |
| 532 instanceKlassHandle scratch_class) { | |
| 533 int i; | |
| 534 | |
| 535 // Check superclasses, or rather their names, since superclasses themselves can be | |
| 536 // requested to replace. | |
| 537 // Check for NULL superclass first since this might be java.lang.Object | |
| 538 if (the_class->super() != scratch_class->super() && | |
| 539 (the_class->super() == NULL || scratch_class->super() == NULL || | |
| 6983 | 540 the_class->super()->name() != |
| 541 scratch_class->super()->name())) { | |
| 0 | 542 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; |
| 543 } | |
| 544 | |
| 545 // Check if the number, names and order of directly implemented interfaces are the same. | |
| 546 // I think in principle we should just check if the sets of names of directly implemented | |
| 547 // interfaces are the same, i.e. the order of declaration (which, however, if changed in the | |
| 548 // .java file, also changes in .class file) should not matter. However, comparing sets is | |
| 549 // technically a bit more difficult, and, more importantly, I am not sure at present that the | |
| 550 // order of interfaces does not matter on the implementation level, i.e. that the VM does not | |
| 551 // rely on it somewhere. | |
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552 Array<Klass*>* k_interfaces = the_class->local_interfaces(); |
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553 Array<Klass*>* k_new_interfaces = scratch_class->local_interfaces(); |
| 0 | 554 int n_intfs = k_interfaces->length(); |
| 555 if (n_intfs != k_new_interfaces->length()) { | |
| 556 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; | |
| 557 } | |
| 558 for (i = 0; i < n_intfs; i++) { | |
| 6983 | 559 if (k_interfaces->at(i)->name() != |
| 560 k_new_interfaces->at(i)->name()) { | |
| 0 | 561 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; |
| 562 } | |
| 563 } | |
| 564 | |
| 565 // Check whether class is in the error init state. | |
| 566 if (the_class->is_in_error_state()) { | |
| 567 // TBD #5057930: special error code is needed in 1.6 | |
| 568 return JVMTI_ERROR_INVALID_CLASS; | |
| 569 } | |
| 570 | |
| 571 // Check whether class modifiers are the same. | |
| 572 jushort old_flags = (jushort) the_class->access_flags().get_flags(); | |
| 573 jushort new_flags = (jushort) scratch_class->access_flags().get_flags(); | |
| 574 if (old_flags != new_flags) { | |
| 575 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_CLASS_MODIFIERS_CHANGED; | |
| 576 } | |
| 577 | |
| 578 // Check if the number, names, types and order of fields declared in these classes | |
| 579 // are the same. | |
| 3938 | 580 JavaFieldStream old_fs(the_class); |
| 581 JavaFieldStream new_fs(scratch_class); | |
| 582 for (; !old_fs.done() && !new_fs.done(); old_fs.next(), new_fs.next()) { | |
| 0 | 583 // access |
| 3938 | 584 old_flags = old_fs.access_flags().as_short(); |
| 585 new_flags = new_fs.access_flags().as_short(); | |
| 0 | 586 if ((old_flags ^ new_flags) & JVM_RECOGNIZED_FIELD_MODIFIERS) { |
| 587 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 588 } | |
| 589 // offset | |
| 3938 | 590 if (old_fs.offset() != new_fs.offset()) { |
| 0 | 591 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; |
| 592 } | |
| 593 // name and signature | |
| 3938 | 594 Symbol* name_sym1 = the_class->constants()->symbol_at(old_fs.name_index()); |
| 595 Symbol* sig_sym1 = the_class->constants()->symbol_at(old_fs.signature_index()); | |
| 596 Symbol* name_sym2 = scratch_class->constants()->symbol_at(new_fs.name_index()); | |
| 597 Symbol* sig_sym2 = scratch_class->constants()->symbol_at(new_fs.signature_index()); | |
| 0 | 598 if (name_sym1 != name_sym2 || sig_sym1 != sig_sym2) { |
| 599 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 600 } | |
| 601 } | |
| 602 | |
| 3938 | 603 // If both streams aren't done then we have a differing number of |
| 604 // fields. | |
| 605 if (!old_fs.done() || !new_fs.done()) { | |
| 606 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
| 607 } | |
| 608 | |
| 0 | 609 // Do a parallel walk through the old and new methods. Detect |
| 610 // cases where they match (exist in both), have been added in | |
| 611 // the new methods, or have been deleted (exist only in the | |
| 612 // old methods). The class file parser places methods in order | |
| 613 // by method name, but does not order overloaded methods by | |
| 614 // signature. In order to determine what fate befell the methods, | |
| 615 // this code places the overloaded new methods that have matching | |
| 616 // old methods in the same order as the old methods and places | |
| 617 // new overloaded methods at the end of overloaded methods of | |
| 618 // that name. The code for this order normalization is adapted | |
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619 // from the algorithm used in InstanceKlass::find_method(). |
| 0 | 620 // Since we are swapping out of order entries as we find them, |
| 621 // we only have to search forward through the overloaded methods. | |
| 622 // Methods which are added and have the same name as an existing | |
| 623 // method (but different signature) will be put at the end of | |
| 624 // the methods with that name, and the name mismatch code will | |
| 625 // handle them. | |
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626 Array<Method*>* k_old_methods(the_class->methods()); |
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627 Array<Method*>* k_new_methods(scratch_class->methods()); |
| 0 | 628 int n_old_methods = k_old_methods->length(); |
| 629 int n_new_methods = k_new_methods->length(); | |
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630 Thread* thread = Thread::current(); |
| 0 | 631 |
| 632 int ni = 0; | |
| 633 int oi = 0; | |
| 634 while (true) { | |
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635 Method* k_old_method; |
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636 Method* k_new_method; |
| 0 | 637 enum { matched, added, deleted, undetermined } method_was = undetermined; |
| 638 | |
| 639 if (oi >= n_old_methods) { | |
| 640 if (ni >= n_new_methods) { | |
| 641 break; // we've looked at everything, done | |
| 642 } | |
| 643 // New method at the end | |
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644 k_new_method = k_new_methods->at(ni); |
| 0 | 645 method_was = added; |
| 646 } else if (ni >= n_new_methods) { | |
| 647 // Old method, at the end, is deleted | |
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648 k_old_method = k_old_methods->at(oi); |
| 0 | 649 method_was = deleted; |
| 650 } else { | |
| 651 // There are more methods in both the old and new lists | |
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652 k_old_method = k_old_methods->at(oi); |
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653 k_new_method = k_new_methods->at(ni); |
| 0 | 654 if (k_old_method->name() != k_new_method->name()) { |
| 655 // Methods are sorted by method name, so a mismatch means added | |
| 656 // or deleted | |
| 657 if (k_old_method->name()->fast_compare(k_new_method->name()) > 0) { | |
| 658 method_was = added; | |
| 659 } else { | |
| 660 method_was = deleted; | |
| 661 } | |
| 662 } else if (k_old_method->signature() == k_new_method->signature()) { | |
| 663 // Both the name and signature match | |
| 664 method_was = matched; | |
| 665 } else { | |
| 666 // The name matches, but the signature doesn't, which means we have to | |
| 667 // search forward through the new overloaded methods. | |
| 668 int nj; // outside the loop for post-loop check | |
| 669 for (nj = ni + 1; nj < n_new_methods; nj++) { | |
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670 Method* m = k_new_methods->at(nj); |
| 0 | 671 if (k_old_method->name() != m->name()) { |
| 672 // reached another method name so no more overloaded methods | |
| 673 method_was = deleted; | |
| 674 break; | |
| 675 } | |
| 676 if (k_old_method->signature() == m->signature()) { | |
| 677 // found a match so swap the methods | |
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678 k_new_methods->at_put(ni, m); |
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679 k_new_methods->at_put(nj, k_new_method); |
| 0 | 680 k_new_method = m; |
| 681 method_was = matched; | |
| 682 break; | |
| 683 } | |
| 684 } | |
| 685 | |
| 686 if (nj >= n_new_methods) { | |
| 687 // reached the end without a match; so method was deleted | |
| 688 method_was = deleted; | |
| 689 } | |
| 690 } | |
| 691 } | |
| 692 | |
| 693 switch (method_was) { | |
| 694 case matched: | |
| 695 // methods match, be sure modifiers do too | |
| 696 old_flags = (jushort) k_old_method->access_flags().get_flags(); | |
| 697 new_flags = (jushort) k_new_method->access_flags().get_flags(); | |
| 698 if ((old_flags ^ new_flags) & ~(JVM_ACC_NATIVE)) { | |
| 699 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_MODIFIERS_CHANGED; | |
| 700 } | |
| 701 { | |
| 702 u2 new_num = k_new_method->method_idnum(); | |
| 703 u2 old_num = k_old_method->method_idnum(); | |
| 704 if (new_num != old_num) { | |
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705 Method* idnum_owner = scratch_class->method_with_idnum(old_num); |
| 0 | 706 if (idnum_owner != NULL) { |
| 707 // There is already a method assigned this idnum -- switch them | |
| 708 idnum_owner->set_method_idnum(new_num); | |
| 709 } | |
| 710 k_new_method->set_method_idnum(old_num); | |
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711 swap_all_method_annotations(old_num, new_num, scratch_class, thread); |
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712 if (thread->has_pending_exception()) { |
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713 return JVMTI_ERROR_OUT_OF_MEMORY; |
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714 } |
| 0 | 715 } |
| 716 } | |
| 717 RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]", | |
| 718 k_new_method->name_and_sig_as_C_string(), ni, | |
| 719 k_old_method->name_and_sig_as_C_string(), oi)); | |
| 720 // advance to next pair of methods | |
| 721 ++oi; | |
| 722 ++ni; | |
| 723 break; | |
| 724 case added: | |
| 725 // method added, see if it is OK | |
| 726 new_flags = (jushort) k_new_method->access_flags().get_flags(); | |
| 727 if ((new_flags & JVM_ACC_PRIVATE) == 0 | |
| 728 // hack: private should be treated as final, but alas | |
| 729 || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0 | |
| 730 ) { | |
| 731 // new methods must be private | |
| 732 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED; | |
| 733 } | |
| 734 { | |
| 735 u2 num = the_class->next_method_idnum(); | |
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736 if (num == ConstMethod::UNSET_IDNUM) { |
| 0 | 737 // cannot add any more methods |
| 738 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED; | |
| 739 } | |
| 740 u2 new_num = k_new_method->method_idnum(); | |
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741 Method* idnum_owner = scratch_class->method_with_idnum(num); |
| 0 | 742 if (idnum_owner != NULL) { |
| 743 // There is already a method assigned this idnum -- switch them | |
| 744 idnum_owner->set_method_idnum(new_num); | |
| 745 } | |
| 746 k_new_method->set_method_idnum(num); | |
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747 swap_all_method_annotations(new_num, num, scratch_class, thread); |
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748 if (thread->has_pending_exception()) { |
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749 return JVMTI_ERROR_OUT_OF_MEMORY; |
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750 } |
| 0 | 751 } |
| 752 RC_TRACE(0x00008000, ("Method added: new: %s [%d]", | |
| 753 k_new_method->name_and_sig_as_C_string(), ni)); | |
| 754 ++ni; // advance to next new method | |
| 755 break; | |
| 756 case deleted: | |
| 757 // method deleted, see if it is OK | |
| 758 old_flags = (jushort) k_old_method->access_flags().get_flags(); | |
| 759 if ((old_flags & JVM_ACC_PRIVATE) == 0 | |
| 760 // hack: private should be treated as final, but alas | |
| 761 || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0 | |
| 762 ) { | |
| 763 // deleted methods must be private | |
| 764 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED; | |
| 765 } | |
| 766 RC_TRACE(0x00008000, ("Method deleted: old: %s [%d]", | |
| 767 k_old_method->name_and_sig_as_C_string(), oi)); | |
| 768 ++oi; // advance to next old method | |
| 769 break; | |
| 770 default: | |
| 771 ShouldNotReachHere(); | |
| 772 } | |
| 773 } | |
| 774 | |
| 775 return JVMTI_ERROR_NONE; | |
| 776 } | |
| 777 | |
| 778 | |
| 779 // Find new constant pool index value for old constant pool index value | |
| 780 // by seaching the index map. Returns zero (0) if there is no mapped | |
| 781 // value for the old constant pool index. | |
| 782 int VM_RedefineClasses::find_new_index(int old_index) { | |
| 783 if (_index_map_count == 0) { | |
| 784 // map is empty so nothing can be found | |
| 785 return 0; | |
| 786 } | |
| 787 | |
| 788 if (old_index < 1 || old_index >= _index_map_p->length()) { | |
| 789 // The old_index is out of range so it is not mapped. This should | |
| 790 // not happen in regular constant pool merging use, but it can | |
| 791 // happen if a corrupt annotation is processed. | |
| 792 return 0; | |
| 793 } | |
| 794 | |
| 795 int value = _index_map_p->at(old_index); | |
| 796 if (value == -1) { | |
| 797 // the old_index is not mapped | |
| 798 return 0; | |
| 799 } | |
| 800 | |
| 801 return value; | |
| 802 } // end find_new_index() | |
| 803 | |
| 804 | |
| 805 // Returns true if the current mismatch is due to a resolved/unresolved | |
| 806 // class pair. Otherwise, returns false. | |
| 807 bool VM_RedefineClasses::is_unresolved_class_mismatch(constantPoolHandle cp1, | |
| 808 int index1, constantPoolHandle cp2, int index2) { | |
| 809 | |
| 810 jbyte t1 = cp1->tag_at(index1).value(); | |
| 811 if (t1 != JVM_CONSTANT_Class && t1 != JVM_CONSTANT_UnresolvedClass) { | |
| 812 return false; // wrong entry type; not our special case | |
| 813 } | |
| 814 | |
| 815 jbyte t2 = cp2->tag_at(index2).value(); | |
| 816 if (t2 != JVM_CONSTANT_Class && t2 != JVM_CONSTANT_UnresolvedClass) { | |
| 817 return false; // wrong entry type; not our special case | |
| 818 } | |
| 819 | |
| 820 if (t1 == t2) { | |
| 821 return false; // not a mismatch; not our special case | |
| 822 } | |
| 823 | |
| 824 char *s1 = cp1->klass_name_at(index1)->as_C_string(); | |
| 825 char *s2 = cp2->klass_name_at(index2)->as_C_string(); | |
| 826 if (strcmp(s1, s2) != 0) { | |
| 827 return false; // strings don't match; not our special case | |
| 828 } | |
| 829 | |
| 830 return true; // made it through the gauntlet; this is our special case | |
| 831 } // end is_unresolved_class_mismatch() | |
| 832 | |
| 833 | |
| 834 jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) { | |
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835 |
| 0 | 836 // For consistency allocate memory using os::malloc wrapper. |
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837 _scratch_classes = (Klass**) |
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838 os::malloc(sizeof(Klass*) * _class_count, mtClass); |
| 0 | 839 if (_scratch_classes == NULL) { |
| 840 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 841 } | |
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842 // Zero initialize the _scratch_classes array. |
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843 for (int i = 0; i < _class_count; i++) { |
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844 _scratch_classes[i] = NULL; |
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845 } |
| 0 | 846 |
| 847 ResourceMark rm(THREAD); | |
| 848 | |
| 849 JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current()); | |
|
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850 // state can only be NULL if the current thread is exiting which |
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851 // should not happen since we're trying to do a RedefineClasses |
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852 guarantee(state != NULL, "exiting thread calling load_new_class_versions"); |
| 0 | 853 for (int i = 0; i < _class_count; i++) { |
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854 // Create HandleMark so that any handles created while loading new class |
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855 // versions are deleted. Constant pools are deallocated while merging |
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856 // constant pools |
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857 HandleMark hm(THREAD); |
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858 |
| 0 | 859 oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass); |
| 860 // classes for primitives cannot be redefined | |
| 861 if (!is_modifiable_class(mirror)) { | |
| 862 return JVMTI_ERROR_UNMODIFIABLE_CLASS; | |
| 863 } | |
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864 Klass* the_class_oop = java_lang_Class::as_Klass(mirror); |
| 0 | 865 instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop); |
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866 Symbol* the_class_sym = the_class->name(); |
| 0 | 867 |
| 868 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 869 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
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870 ("loading name=%s kind=%d (avail_mem=" UINT64_FORMAT "K)", |
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871 the_class->external_name(), _class_load_kind, |
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872 os::available_memory() >> 10)); |
| 0 | 873 |
| 874 ClassFileStream st((u1*) _class_defs[i].class_bytes, | |
| 875 _class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__"); | |
| 876 | |
| 877 // Parse the stream. | |
| 878 Handle the_class_loader(THREAD, the_class->class_loader()); | |
| 879 Handle protection_domain(THREAD, the_class->protection_domain()); | |
| 880 // Set redefined class handle in JvmtiThreadState class. | |
| 881 // This redefined class is sent to agent event handler for class file | |
| 882 // load hook event. | |
| 883 state->set_class_being_redefined(&the_class, _class_load_kind); | |
| 884 | |
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885 Klass* k = SystemDictionary::parse_stream(the_class_sym, |
| 0 | 886 the_class_loader, |
| 887 protection_domain, | |
| 888 &st, | |
| 889 THREAD); | |
| 890 // Clear class_being_redefined just to be sure. | |
| 891 state->clear_class_being_redefined(); | |
| 892 | |
| 893 // TODO: if this is retransform, and nothing changed we can skip it | |
| 894 | |
| 895 instanceKlassHandle scratch_class (THREAD, k); | |
| 896 | |
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897 // Need to clean up allocated InstanceKlass if there's an error so assign |
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898 // the result here. Caller deallocates all the scratch classes in case of |
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899 // an error. |
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900 _scratch_classes[i] = k; |
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901 |
| 0 | 902 if (HAS_PENDING_EXCEPTION) { |
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903 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
| 0 | 904 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
| 905 RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("parse_stream exception: '%s'", | |
| 906 ex_name->as_C_string())); | |
| 907 CLEAR_PENDING_EXCEPTION; | |
| 908 | |
| 909 if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) { | |
| 910 return JVMTI_ERROR_UNSUPPORTED_VERSION; | |
| 911 } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) { | |
| 912 return JVMTI_ERROR_INVALID_CLASS_FORMAT; | |
| 913 } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) { | |
| 914 return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION; | |
| 915 } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) { | |
| 916 // The message will be "XXX (wrong name: YYY)" | |
| 917 return JVMTI_ERROR_NAMES_DONT_MATCH; | |
| 918 } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 919 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 920 } else { // Just in case more exceptions can be thrown.. | |
| 921 return JVMTI_ERROR_FAILS_VERIFICATION; | |
| 922 } | |
| 923 } | |
| 924 | |
| 925 // Ensure class is linked before redefine | |
| 926 if (!the_class->is_linked()) { | |
| 927 the_class->link_class(THREAD); | |
| 928 if (HAS_PENDING_EXCEPTION) { | |
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929 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
| 0 | 930 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
| 931 RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("link_class exception: '%s'", | |
| 932 ex_name->as_C_string())); | |
| 933 CLEAR_PENDING_EXCEPTION; | |
| 934 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 935 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 936 } else { | |
| 937 return JVMTI_ERROR_INTERNAL; | |
| 938 } | |
| 939 } | |
| 940 } | |
| 941 | |
| 942 // Do the validity checks in compare_and_normalize_class_versions() | |
| 943 // before verifying the byte codes. By doing these checks first, we | |
| 944 // limit the number of functions that require redirection from | |
| 945 // the_class to scratch_class. In particular, we don't have to | |
| 946 // modify JNI GetSuperclass() and thus won't change its performance. | |
| 947 jvmtiError res = compare_and_normalize_class_versions(the_class, | |
| 948 scratch_class); | |
| 949 if (res != JVMTI_ERROR_NONE) { | |
| 950 return res; | |
| 951 } | |
| 952 | |
| 953 // verify what the caller passed us | |
| 954 { | |
| 955 // The bug 6214132 caused the verification to fail. | |
| 956 // Information about the_class and scratch_class is temporarily | |
| 957 // recorded into jvmtiThreadState. This data is used to redirect | |
| 958 // the_class to scratch_class in the JVM_* functions called by the | |
| 959 // verifier. Please, refer to jvmtiThreadState.hpp for the detailed | |
| 960 // description. | |
| 961 RedefineVerifyMark rvm(&the_class, &scratch_class, state); | |
| 962 Verifier::verify( | |
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963 scratch_class, Verifier::ThrowException, true, THREAD); |
| 0 | 964 } |
| 965 | |
| 966 if (HAS_PENDING_EXCEPTION) { | |
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967 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
| 0 | 968 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
| 969 RC_TRACE_WITH_THREAD(0x00000002, THREAD, | |
| 970 ("verify_byte_codes exception: '%s'", ex_name->as_C_string())); | |
| 971 CLEAR_PENDING_EXCEPTION; | |
| 972 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 973 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 974 } else { | |
| 975 // tell the caller the bytecodes are bad | |
| 976 return JVMTI_ERROR_FAILS_VERIFICATION; | |
| 977 } | |
| 978 } | |
| 979 | |
| 980 res = merge_cp_and_rewrite(the_class, scratch_class, THREAD); | |
| 981 if (res != JVMTI_ERROR_NONE) { | |
| 982 return res; | |
| 983 } | |
| 984 | |
| 985 if (VerifyMergedCPBytecodes) { | |
| 986 // verify what we have done during constant pool merging | |
| 987 { | |
| 988 RedefineVerifyMark rvm(&the_class, &scratch_class, state); | |
|
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989 Verifier::verify(scratch_class, Verifier::ThrowException, true, THREAD); |
| 0 | 990 } |
| 991 | |
| 992 if (HAS_PENDING_EXCEPTION) { | |
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993 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
| 0 | 994 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
| 995 RC_TRACE_WITH_THREAD(0x00000002, THREAD, | |
| 996 ("verify_byte_codes post merge-CP exception: '%s'", | |
| 997 ex_name->as_C_string())); | |
| 998 CLEAR_PENDING_EXCEPTION; | |
| 999 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 1000 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 1001 } else { | |
| 1002 // tell the caller that constant pool merging screwed up | |
| 1003 return JVMTI_ERROR_INTERNAL; | |
| 1004 } | |
| 1005 } | |
| 1006 } | |
| 1007 | |
| 1008 Rewriter::rewrite(scratch_class, THREAD); | |
| 3748 | 1009 if (!HAS_PENDING_EXCEPTION) { |
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1010 scratch_class->link_methods(THREAD); |
| 3748 | 1011 } |
| 0 | 1012 if (HAS_PENDING_EXCEPTION) { |
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1013 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
| 0 | 1014 CLEAR_PENDING_EXCEPTION; |
| 1015 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
| 1016 return JVMTI_ERROR_OUT_OF_MEMORY; | |
| 1017 } else { | |
| 1018 return JVMTI_ERROR_INTERNAL; | |
| 1019 } | |
| 1020 } | |
| 1021 | |
| 1022 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
| 1023 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
| 1024 ("loaded name=%s (avail_mem=" UINT64_FORMAT "K)", | |
| 1025 the_class->external_name(), os::available_memory() >> 10)); | |
| 1026 } | |
| 1027 | |
| 1028 return JVMTI_ERROR_NONE; | |
| 1029 } | |
| 1030 | |
| 1031 | |
| 1032 // Map old_index to new_index as needed. scratch_cp is only needed | |
| 1033 // for RC_TRACE() calls. | |
| 1034 void VM_RedefineClasses::map_index(constantPoolHandle scratch_cp, | |
| 1035 int old_index, int new_index) { | |
| 1036 if (find_new_index(old_index) != 0) { | |
| 1037 // old_index is already mapped | |
| 1038 return; | |
| 1039 } | |
| 1040 | |
| 1041 if (old_index == new_index) { | |
| 1042 // no mapping is needed | |
| 1043 return; | |
| 1044 } | |
| 1045 | |
| 1046 _index_map_p->at_put(old_index, new_index); | |
| 1047 _index_map_count++; | |
| 1048 | |
| 1049 RC_TRACE(0x00040000, ("mapped tag %d at index %d to %d", | |
| 1050 scratch_cp->tag_at(old_index).value(), old_index, new_index)); | |
| 1051 } // end map_index() | |
| 1052 | |
| 1053 | |
| 1054 // Merge old_cp and scratch_cp and return the results of the merge via | |
| 1055 // merge_cp_p. The number of entries in *merge_cp_p is returned via | |
| 1056 // merge_cp_length_p. The entries in old_cp occupy the same locations | |
| 1057 // in *merge_cp_p. Also creates a map of indices from entries in | |
| 1058 // scratch_cp to the corresponding entry in *merge_cp_p. Index map | |
| 1059 // entries are only created for entries in scratch_cp that occupy a | |
| 1060 // different location in *merged_cp_p. | |
| 1061 bool VM_RedefineClasses::merge_constant_pools(constantPoolHandle old_cp, | |
| 1062 constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p, | |
| 1063 int *merge_cp_length_p, TRAPS) { | |
| 1064 | |
| 1065 if (merge_cp_p == NULL) { | |
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1066 assert(false, "caller must provide scratch constantPool"); |
| 0 | 1067 return false; // robustness |
| 1068 } | |
| 1069 if (merge_cp_length_p == NULL) { | |
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1070 assert(false, "caller must provide scratch CP length"); |
| 0 | 1071 return false; // robustness |
| 1072 } | |
| 1073 // Worst case we need old_cp->length() + scratch_cp()->length(), | |
| 1074 // but the caller might be smart so make sure we have at least | |
| 1075 // the minimum. | |
| 1076 if ((*merge_cp_p)->length() < old_cp->length()) { | |
| 1077 assert(false, "merge area too small"); | |
| 1078 return false; // robustness | |
| 1079 } | |
| 1080 | |
| 1081 RC_TRACE_WITH_THREAD(0x00010000, THREAD, | |
| 1082 ("old_cp_len=%d, scratch_cp_len=%d", old_cp->length(), | |
| 1083 scratch_cp->length())); | |
| 1084 | |
| 1085 { | |
| 1086 // Pass 0: | |
| 1087 // The old_cp is copied to *merge_cp_p; this means that any code | |
| 1088 // using old_cp does not have to change. This work looks like a | |
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1089 // perfect fit for ConstantPool*::copy_cp_to(), but we need to |
| 0 | 1090 // handle one special case: |
| 1091 // - revert JVM_CONSTANT_Class to JVM_CONSTANT_UnresolvedClass | |
| 1092 // This will make verification happy. | |
| 1093 | |
| 1094 int old_i; // index into old_cp | |
| 1095 | |
| 1096 // index zero (0) is not used in constantPools | |
| 1097 for (old_i = 1; old_i < old_cp->length(); old_i++) { | |
| 1098 // leave debugging crumb | |
| 1099 jbyte old_tag = old_cp->tag_at(old_i).value(); | |
| 1100 switch (old_tag) { | |
| 1101 case JVM_CONSTANT_Class: | |
|
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1102 case JVM_CONSTANT_UnresolvedClass: |
| 0 | 1103 // revert the copy to JVM_CONSTANT_UnresolvedClass |
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1104 // May be resolving while calling this so do the same for |
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1105 // JVM_CONSTANT_UnresolvedClass (klass_name_at() deals with transition) |
| 0 | 1106 (*merge_cp_p)->unresolved_klass_at_put(old_i, |
| 1107 old_cp->klass_name_at(old_i)); | |
| 1108 break; | |
| 1109 | |
| 1110 case JVM_CONSTANT_Double: | |
| 1111 case JVM_CONSTANT_Long: | |
| 1112 // just copy the entry to *merge_cp_p, but double and long take | |
| 1113 // two constant pool entries | |
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1114 ConstantPool::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0); |
| 0 | 1115 old_i++; |
| 1116 break; | |
| 1117 | |
| 1118 default: | |
| 1119 // just copy the entry to *merge_cp_p | |
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1120 ConstantPool::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0); |
| 0 | 1121 break; |
| 1122 } | |
| 1123 } // end for each old_cp entry | |
| 1124 | |
| 1125 // We don't need to sanity check that *merge_cp_length_p is within | |
| 1126 // *merge_cp_p bounds since we have the minimum on-entry check above. | |
| 1127 (*merge_cp_length_p) = old_i; | |
| 1128 } | |
| 1129 | |
| 1130 // merge_cp_len should be the same as old_cp->length() at this point | |
| 1131 // so this trace message is really a "warm-and-breathing" message. | |
| 1132 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
| 1133 ("after pass 0: merge_cp_len=%d", *merge_cp_length_p)); | |
| 1134 | |
| 1135 int scratch_i; // index into scratch_cp | |
| 1136 { | |
| 1137 // Pass 1a: | |
| 1138 // Compare scratch_cp entries to the old_cp entries that we have | |
| 1139 // already copied to *merge_cp_p. In this pass, we are eliminating | |
| 1140 // exact duplicates (matching entry at same index) so we only | |
| 1141 // compare entries in the common indice range. | |
| 1142 int increment = 1; | |
| 1143 int pass1a_length = MIN2(old_cp->length(), scratch_cp->length()); | |
| 1144 for (scratch_i = 1; scratch_i < pass1a_length; scratch_i += increment) { | |
| 1145 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 1146 case JVM_CONSTANT_Double: | |
| 1147 case JVM_CONSTANT_Long: | |
| 1148 // double and long take two constant pool entries | |
| 1149 increment = 2; | |
| 1150 break; | |
| 1151 | |
| 1152 default: | |
| 1153 increment = 1; | |
| 1154 break; | |
| 1155 } | |
| 1156 | |
| 1157 bool match = scratch_cp->compare_entry_to(scratch_i, *merge_cp_p, | |
| 1158 scratch_i, CHECK_0); | |
| 1159 if (match) { | |
| 1160 // found a match at the same index so nothing more to do | |
| 1161 continue; | |
| 1162 } else if (is_unresolved_class_mismatch(scratch_cp, scratch_i, | |
| 1163 *merge_cp_p, scratch_i)) { | |
| 1164 // The mismatch in compare_entry_to() above is because of a | |
| 1165 // resolved versus unresolved class entry at the same index | |
| 1166 // with the same string value. Since Pass 0 reverted any | |
| 1167 // class entries to unresolved class entries in *merge_cp_p, | |
| 1168 // we go with the unresolved class entry. | |
| 1169 continue; | |
| 1170 } | |
| 1171 | |
| 1172 int found_i = scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, | |
| 1173 CHECK_0); | |
| 1174 if (found_i != 0) { | |
| 1175 guarantee(found_i != scratch_i, | |
| 1176 "compare_entry_to() and find_matching_entry() do not agree"); | |
| 1177 | |
| 1178 // Found a matching entry somewhere else in *merge_cp_p so | |
| 1179 // just need a mapping entry. | |
| 1180 map_index(scratch_cp, scratch_i, found_i); | |
| 1181 continue; | |
| 1182 } | |
| 1183 | |
| 1184 // The find_matching_entry() call above could fail to find a match | |
| 1185 // due to a resolved versus unresolved class or string entry situation | |
| 1186 // like we solved above with the is_unresolved_*_mismatch() calls. | |
| 1187 // However, we would have to call is_unresolved_*_mismatch() over | |
| 1188 // all of *merge_cp_p (potentially) and that doesn't seem to be | |
| 1189 // worth the time. | |
| 1190 | |
| 1191 // No match found so we have to append this entry and any unique | |
| 1192 // referenced entries to *merge_cp_p. | |
| 1193 append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p, | |
| 1194 CHECK_0); | |
| 1195 } | |
| 1196 } | |
| 1197 | |
| 1198 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
| 1199 ("after pass 1a: merge_cp_len=%d, scratch_i=%d, index_map_len=%d", | |
| 1200 *merge_cp_length_p, scratch_i, _index_map_count)); | |
| 1201 | |
| 1202 if (scratch_i < scratch_cp->length()) { | |
| 1203 // Pass 1b: | |
| 1204 // old_cp is smaller than scratch_cp so there are entries in | |
| 1205 // scratch_cp that we have not yet processed. We take care of | |
| 1206 // those now. | |
| 1207 int increment = 1; | |
| 1208 for (; scratch_i < scratch_cp->length(); scratch_i += increment) { | |
| 1209 switch (scratch_cp->tag_at(scratch_i).value()) { | |
| 1210 case JVM_CONSTANT_Double: | |
| 1211 case JVM_CONSTANT_Long: | |
| 1212 // double and long take two constant pool entries | |
| 1213 increment = 2; | |
| 1214 break; | |
| 1215 | |
| 1216 default: | |
| 1217 increment = 1; | |
| 1218 break; | |
| 1219 } | |
| 1220 | |
| 1221 int found_i = | |
| 1222 scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, CHECK_0); | |
| 1223 if (found_i != 0) { | |
| 1224 // Found a matching entry somewhere else in *merge_cp_p so | |
| 1225 // just need a mapping entry. | |
| 1226 map_index(scratch_cp, scratch_i, found_i); | |
| 1227 continue; | |
| 1228 } | |
| 1229 | |
| 1230 // No match found so we have to append this entry and any unique | |
| 1231 // referenced entries to *merge_cp_p. | |
| 1232 append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p, | |
| 1233 CHECK_0); | |
| 1234 } | |
| 1235 | |
| 1236 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
| 1237 ("after pass 1b: merge_cp_len=%d, scratch_i=%d, index_map_len=%d", | |
| 1238 *merge_cp_length_p, scratch_i, _index_map_count)); | |
| 1239 } | |
| 1240 | |
| 1241 return true; | |
| 1242 } // end merge_constant_pools() | |
| 1243 | |
| 1244 | |
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1245 // Scoped object to clean up the constant pool(s) created for merging |
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1246 class MergeCPCleaner { |
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1247 ClassLoaderData* _loader_data; |
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1248 ConstantPool* _cp; |
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1249 ConstantPool* _scratch_cp; |
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1250 public: |
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1251 MergeCPCleaner(ClassLoaderData* loader_data, ConstantPool* merge_cp) : |
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1252 _loader_data(loader_data), _cp(merge_cp), _scratch_cp(NULL) {} |
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1253 ~MergeCPCleaner() { |
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1254 _loader_data->add_to_deallocate_list(_cp); |
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1255 if (_scratch_cp != NULL) { |
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1256 _loader_data->add_to_deallocate_list(_scratch_cp); |
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1257 } |
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1258 } |
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1259 void add_scratch_cp(ConstantPool* scratch_cp) { _scratch_cp = scratch_cp; } |
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1260 }; |
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1261 |
| 0 | 1262 // Merge constant pools between the_class and scratch_class and |
| 1263 // potentially rewrite bytecodes in scratch_class to use the merged | |
| 1264 // constant pool. | |
| 1265 jvmtiError VM_RedefineClasses::merge_cp_and_rewrite( | |
| 1266 instanceKlassHandle the_class, instanceKlassHandle scratch_class, | |
| 1267 TRAPS) { | |
| 1268 // worst case merged constant pool length is old and new combined | |
| 1269 int merge_cp_length = the_class->constants()->length() | |
| 1270 + scratch_class->constants()->length(); | |
| 1271 | |
| 1272 // Constant pools are not easily reused so we allocate a new one | |
| 1273 // each time. | |
|
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1274 // merge_cp is created unsafe for concurrent GC processing. It |
|
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1275 // should be marked safe before discarding it. Even though |
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1276 // garbage, if it crosses a card boundary, it may be scanned |
|
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1277 // in order to find the start of the first complete object on the card. |
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1278 ClassLoaderData* loader_data = the_class->class_loader_data(); |
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1279 ConstantPool* merge_cp_oop = |
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1280 ConstantPool::allocate(loader_data, |
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1281 merge_cp_length, |
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1282 THREAD); |
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1283 MergeCPCleaner cp_cleaner(loader_data, merge_cp_oop); |
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1284 |
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1285 HandleMark hm(THREAD); // make sure handles are cleared before |
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1286 // MergeCPCleaner clears out merge_cp_oop |
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1287 constantPoolHandle merge_cp(THREAD, merge_cp_oop); |
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1288 |
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1289 // Get constants() from the old class because it could have been rewritten |
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1290 // while we were at a safepoint allocating a new constant pool. |
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1291 constantPoolHandle old_cp(THREAD, the_class->constants()); |
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1292 constantPoolHandle scratch_cp(THREAD, scratch_class->constants()); |
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1293 |
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1294 // If the length changed, the class was redefined out from under us. Return |
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1295 // an error. |
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1296 if (merge_cp_length != the_class->constants()->length() |
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1297 + scratch_class->constants()->length()) { |
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1298 return JVMTI_ERROR_INTERNAL; |
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1299 } |
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1300 |
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1301 // Update the version number of the constant pool |
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1302 merge_cp->increment_and_save_version(old_cp->version()); |
| 0 | 1303 |
| 1304 ResourceMark rm(THREAD); | |
| 1305 _index_map_count = 0; | |
| 1306 _index_map_p = new intArray(scratch_cp->length(), -1); | |
| 1307 | |
| 1308 bool result = merge_constant_pools(old_cp, scratch_cp, &merge_cp, | |
| 1309 &merge_cp_length, THREAD); | |
| 1310 if (!result) { | |
| 1311 // The merge can fail due to memory allocation failure or due | |
| 1312 // to robustness checks. | |
| 1313 return JVMTI_ERROR_INTERNAL; | |
| 1314 } | |
| 1315 | |
| 1316 RC_TRACE_WITH_THREAD(0x00010000, THREAD, | |
| 1317 ("merge_cp_len=%d, index_map_len=%d", merge_cp_length, _index_map_count)); | |
| 1318 | |
| 1319 if (_index_map_count == 0) { | |
| 1320 // there is nothing to map between the new and merged constant pools | |
| 1321 | |
| 1322 if (old_cp->length() == scratch_cp->length()) { | |
| 1323 // The old and new constant pools are the same length and the | |
| 1324 // index map is empty. This means that the three constant pools | |
| 1325 // are equivalent (but not the same). Unfortunately, the new | |
| 1326 // constant pool has not gone through link resolution nor have | |
| 1327 // the new class bytecodes gone through constant pool cache | |
| 1328 // rewriting so we can't use the old constant pool with the new | |
| 1329 // class. | |
| 1330 | |
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1331 // toss the merged constant pool at return |
| 0 | 1332 } else if (old_cp->length() < scratch_cp->length()) { |
| 1333 // The old constant pool has fewer entries than the new constant | |
| 1334 // pool and the index map is empty. This means the new constant | |
| 1335 // pool is a superset of the old constant pool. However, the old | |
| 1336 // class bytecodes have already gone through constant pool cache | |
| 1337 // rewriting so we can't use the new constant pool with the old | |
| 1338 // class. | |
| 1339 | |
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1340 // toss the merged constant pool at return |
| 0 | 1341 } else { |
| 1342 // The old constant pool has more entries than the new constant | |
| 1343 // pool and the index map is empty. This means that both the old | |
| 1344 // and merged constant pools are supersets of the new constant | |
| 1345 // pool. | |
| 1346 | |
| 1347 // Replace the new constant pool with a shrunken copy of the | |
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1348 // merged constant pool |
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1349 set_new_constant_pool(loader_data, scratch_class, merge_cp, merge_cp_length, THREAD); |
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1350 // The new constant pool replaces scratch_cp so have cleaner clean it up. |
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1351 // It can't be cleaned up while there are handles to it. |
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1352 cp_cleaner.add_scratch_cp(scratch_cp()); |
| 0 | 1353 } |
| 1354 } else { | |
| 1355 if (RC_TRACE_ENABLED(0x00040000)) { | |
| 1356 // don't want to loop unless we are tracing | |
| 1357 int count = 0; | |
| 1358 for (int i = 1; i < _index_map_p->length(); i++) { | |
| 1359 int value = _index_map_p->at(i); | |
| 1360 | |
| 1361 if (value != -1) { | |
| 1362 RC_TRACE_WITH_THREAD(0x00040000, THREAD, | |
| 1363 ("index_map[%d]: old=%d new=%d", count, i, value)); | |
| 1364 count++; | |
| 1365 } | |
| 1366 } | |
| 1367 } | |
| 1368 | |
| 1369 // We have entries mapped between the new and merged constant pools | |
| 1370 // so we have to rewrite some constant pool references. | |
| 1371 if (!rewrite_cp_refs(scratch_class, THREAD)) { | |
| 1372 return JVMTI_ERROR_INTERNAL; | |
| 1373 } | |
| 1374 | |
| 1375 // Replace the new constant pool with a shrunken copy of the | |
| 1376 // merged constant pool so now the rewritten bytecodes have | |
| 1377 // valid references; the previous new constant pool will get | |
| 1378 // GCed. | |
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1379 set_new_constant_pool(loader_data, scratch_class, merge_cp, merge_cp_length, THREAD); |
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1380 // The new constant pool replaces scratch_cp so have cleaner clean it up. |
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1381 // It can't be cleaned up while there are handles to it. |
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1382 cp_cleaner.add_scratch_cp(scratch_cp()); |
| 0 | 1383 } |
| 1384 | |
| 1385 return JVMTI_ERROR_NONE; | |
| 1386 } // end merge_cp_and_rewrite() | |
| 1387 | |
| 1388 | |
| 1389 // Rewrite constant pool references in klass scratch_class. | |
| 1390 bool VM_RedefineClasses::rewrite_cp_refs(instanceKlassHandle scratch_class, | |
| 1391 TRAPS) { | |
| 1392 | |
| 1393 // rewrite constant pool references in the methods: | |
| 1394 if (!rewrite_cp_refs_in_methods(scratch_class, THREAD)) { | |
| 605 | 1395 // propagate failure back to caller |
| 0 | 1396 return false; |
| 1397 } | |
| 1398 | |
| 1399 // rewrite constant pool references in the class_annotations: | |
| 1400 if (!rewrite_cp_refs_in_class_annotations(scratch_class, THREAD)) { | |
| 605 | 1401 // propagate failure back to caller |
| 0 | 1402 return false; |
| 1403 } | |
| 1404 | |
| 1405 // rewrite constant pool references in the fields_annotations: | |
| 1406 if (!rewrite_cp_refs_in_fields_annotations(scratch_class, THREAD)) { | |
| 605 | 1407 // propagate failure back to caller |
| 0 | 1408 return false; |
| 1409 } | |
| 1410 | |
| 1411 // rewrite constant pool references in the methods_annotations: | |
| 1412 if (!rewrite_cp_refs_in_methods_annotations(scratch_class, THREAD)) { | |
| 605 | 1413 // propagate failure back to caller |
| 0 | 1414 return false; |
| 1415 } | |
| 1416 | |
| 1417 // rewrite constant pool references in the methods_parameter_annotations: | |
| 1418 if (!rewrite_cp_refs_in_methods_parameter_annotations(scratch_class, | |
| 1419 THREAD)) { | |
| 605 | 1420 // propagate failure back to caller |
| 0 | 1421 return false; |
| 1422 } | |
| 1423 | |
| 1424 // rewrite constant pool references in the methods_default_annotations: | |
| 1425 if (!rewrite_cp_refs_in_methods_default_annotations(scratch_class, | |
| 1426 THREAD)) { | |
| 605 | 1427 // propagate failure back to caller |
| 0 | 1428 return false; |
| 1429 } | |
| 1430 | |
| 1431 return true; | |
| 1432 } // end rewrite_cp_refs() | |
| 1433 | |
| 1434 | |
| 1435 // Rewrite constant pool references in the methods. | |
| 1436 bool VM_RedefineClasses::rewrite_cp_refs_in_methods( | |
| 1437 instanceKlassHandle scratch_class, TRAPS) { | |
| 1438 | |
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1439 Array<Method*>* methods = scratch_class->methods(); |
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1440 |
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1441 if (methods == NULL || methods->length() == 0) { |
| 0 | 1442 // no methods so nothing to do |
| 1443 return true; | |
| 1444 } | |
| 1445 | |
| 1446 // rewrite constant pool references in the methods: | |
| 1447 for (int i = methods->length() - 1; i >= 0; i--) { | |
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1448 methodHandle method(THREAD, methods->at(i)); |
| 0 | 1449 methodHandle new_method; |
| 1450 rewrite_cp_refs_in_method(method, &new_method, CHECK_false); | |
| 1451 if (!new_method.is_null()) { | |
| 1452 // the method has been replaced so save the new method version | |
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1453 methods->at_put(i, new_method()); |
| 0 | 1454 } |
| 1455 } | |
| 1456 | |
| 1457 return true; | |
| 1458 } | |
| 1459 | |
| 1460 | |
| 1461 // Rewrite constant pool references in the specific method. This code | |
| 1462 // was adapted from Rewriter::rewrite_method(). | |
| 1463 void VM_RedefineClasses::rewrite_cp_refs_in_method(methodHandle method, | |
| 1464 methodHandle *new_method_p, TRAPS) { | |
| 1465 | |
| 1466 *new_method_p = methodHandle(); // default is no new method | |
| 1467 | |
| 1468 // We cache a pointer to the bytecodes here in code_base. If GC | |
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1469 // moves the Method*, then the bytecodes will also move which |
| 0 | 1470 // will likely cause a crash. We create a No_Safepoint_Verifier |
| 1471 // object to detect whether we pass a possible safepoint in this | |
| 1472 // code block. | |
| 1473 No_Safepoint_Verifier nsv; | |
| 1474 | |
| 1475 // Bytecodes and their length | |
| 1476 address code_base = method->code_base(); | |
| 1477 int code_length = method->code_size(); | |
| 1478 | |
| 1479 int bc_length; | |
| 1480 for (int bci = 0; bci < code_length; bci += bc_length) { | |
| 1481 address bcp = code_base + bci; | |
| 1482 Bytecodes::Code c = (Bytecodes::Code)(*bcp); | |
| 1483 | |
| 1484 bc_length = Bytecodes::length_for(c); | |
| 1485 if (bc_length == 0) { | |
| 1486 // More complicated bytecodes report a length of zero so | |
| 1487 // we have to try again a slightly different way. | |
| 2142 | 1488 bc_length = Bytecodes::length_at(method(), bcp); |
| 0 | 1489 } |
| 1490 | |
| 1491 assert(bc_length != 0, "impossible bytecode length"); | |
| 1492 | |
| 1493 switch (c) { | |
| 1494 case Bytecodes::_ldc: | |
| 1495 { | |
| 1496 int cp_index = *(bcp + 1); | |
| 1497 int new_index = find_new_index(cp_index); | |
| 1498 | |
| 1499 if (StressLdcRewrite && new_index == 0) { | |
| 1500 // If we are stressing ldc -> ldc_w rewriting, then we | |
| 1501 // always need a new_index value. | |
| 1502 new_index = cp_index; | |
| 1503 } | |
| 1504 if (new_index != 0) { | |
| 1505 // the original index is mapped so we have more work to do | |
| 1506 if (!StressLdcRewrite && new_index <= max_jubyte) { | |
| 1507 // The new value can still use ldc instead of ldc_w | |
| 1508 // unless we are trying to stress ldc -> ldc_w rewriting | |
| 1509 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 1510 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c), | |
| 1511 bcp, cp_index, new_index)); | |
| 1512 *(bcp + 1) = new_index; | |
| 1513 } else { | |
| 1514 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 1515 ("%s->ldc_w@" INTPTR_FORMAT " old=%d, new=%d", | |
| 1516 Bytecodes::name(c), bcp, cp_index, new_index)); | |
| 1517 // the new value needs ldc_w instead of ldc | |
| 1518 u_char inst_buffer[4]; // max instruction size is 4 bytes | |
| 1519 bcp = (address)inst_buffer; | |
| 1520 // construct new instruction sequence | |
| 1521 *bcp = Bytecodes::_ldc_w; | |
| 1522 bcp++; | |
| 1523 // Rewriter::rewrite_method() does not rewrite ldc -> ldc_w. | |
| 1524 // See comment below for difference between put_Java_u2() | |
| 1525 // and put_native_u2(). | |
| 1526 Bytes::put_Java_u2(bcp, new_index); | |
| 1527 | |
| 1528 Relocator rc(method, NULL /* no RelocatorListener needed */); | |
| 1529 methodHandle m; | |
| 1530 { | |
| 1531 Pause_No_Safepoint_Verifier pnsv(&nsv); | |
| 1532 | |
| 1533 // ldc is 2 bytes and ldc_w is 3 bytes | |
| 1534 m = rc.insert_space_at(bci, 3, inst_buffer, THREAD); | |
| 1535 if (m.is_null() || HAS_PENDING_EXCEPTION) { | |
| 1536 guarantee(false, "insert_space_at() failed"); | |
| 1537 } | |
| 1538 } | |
| 1539 | |
| 1540 // return the new method so that the caller can update | |
| 1541 // the containing class | |
| 1542 *new_method_p = method = m; | |
| 1543 // switch our bytecode processing loop from the old method | |
| 1544 // to the new method | |
| 1545 code_base = method->code_base(); | |
| 1546 code_length = method->code_size(); | |
| 1547 bcp = code_base + bci; | |
| 1548 c = (Bytecodes::Code)(*bcp); | |
| 1549 bc_length = Bytecodes::length_for(c); | |
| 1550 assert(bc_length != 0, "sanity check"); | |
| 1551 } // end we need ldc_w instead of ldc | |
| 1552 } // end if there is a mapped index | |
| 1553 } break; | |
| 1554 | |
| 1555 // these bytecodes have a two-byte constant pool index | |
| 1556 case Bytecodes::_anewarray : // fall through | |
| 1557 case Bytecodes::_checkcast : // fall through | |
| 1558 case Bytecodes::_getfield : // fall through | |
| 1559 case Bytecodes::_getstatic : // fall through | |
| 1560 case Bytecodes::_instanceof : // fall through | |
| 1561 case Bytecodes::_invokeinterface: // fall through | |
| 1562 case Bytecodes::_invokespecial : // fall through | |
| 1563 case Bytecodes::_invokestatic : // fall through | |
| 1564 case Bytecodes::_invokevirtual : // fall through | |
| 1565 case Bytecodes::_ldc_w : // fall through | |
| 1566 case Bytecodes::_ldc2_w : // fall through | |
| 1567 case Bytecodes::_multianewarray : // fall through | |
| 1568 case Bytecodes::_new : // fall through | |
| 1569 case Bytecodes::_putfield : // fall through | |
| 1570 case Bytecodes::_putstatic : | |
| 1571 { | |
| 1572 address p = bcp + 1; | |
| 1573 int cp_index = Bytes::get_Java_u2(p); | |
| 1574 int new_index = find_new_index(cp_index); | |
| 1575 if (new_index != 0) { | |
| 1576 // the original index is mapped so update w/ new value | |
| 1577 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 1578 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c), | |
| 1579 bcp, cp_index, new_index)); | |
| 1580 // Rewriter::rewrite_method() uses put_native_u2() in this | |
| 1581 // situation because it is reusing the constant pool index | |
| 1582 // location for a native index into the constantPoolCache. | |
| 1583 // Since we are updating the constant pool index prior to | |
| 1584 // verification and constantPoolCache initialization, we | |
| 1585 // need to keep the new index in Java byte order. | |
| 1586 Bytes::put_Java_u2(p, new_index); | |
| 1587 } | |
| 1588 } break; | |
| 1589 } | |
| 1590 } // end for each bytecode | |
| 1591 } // end rewrite_cp_refs_in_method() | |
| 1592 | |
| 1593 | |
| 1594 // Rewrite constant pool references in the class_annotations field. | |
| 1595 bool VM_RedefineClasses::rewrite_cp_refs_in_class_annotations( | |
| 1596 instanceKlassHandle scratch_class, TRAPS) { | |
| 1597 | |
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1598 AnnotationArray* class_annotations = scratch_class->class_annotations(); |
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1599 if (class_annotations == NULL || class_annotations->length() == 0) { |
| 0 | 1600 // no class_annotations so nothing to do |
| 1601 return true; | |
| 1602 } | |
| 1603 | |
| 1604 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1605 ("class_annotations length=%d", class_annotations->length())); | |
| 1606 | |
| 1607 int byte_i = 0; // byte index into class_annotations | |
| 1608 return rewrite_cp_refs_in_annotations_typeArray(class_annotations, byte_i, | |
| 1609 THREAD); | |
| 1610 } | |
| 1611 | |
| 1612 | |
| 1613 // Rewrite constant pool references in an annotations typeArray. This | |
| 1614 // "structure" is adapted from the RuntimeVisibleAnnotations_attribute | |
| 1615 // that is described in section 4.8.15 of the 2nd-edition of the VM spec: | |
| 1616 // | |
| 1617 // annotations_typeArray { | |
| 1618 // u2 num_annotations; | |
| 1619 // annotation annotations[num_annotations]; | |
| 1620 // } | |
| 1621 // | |
| 1622 bool VM_RedefineClasses::rewrite_cp_refs_in_annotations_typeArray( | |
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1623 AnnotationArray* annotations_typeArray, int &byte_i_ref, TRAPS) { |
| 0 | 1624 |
| 1625 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1626 // not enough room for num_annotations field | |
| 1627 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1628 ("length() is too small for num_annotations field")); | |
| 1629 return false; | |
| 1630 } | |
| 1631 | |
| 1632 u2 num_annotations = Bytes::get_Java_u2((address) | |
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1633 annotations_typeArray->adr_at(byte_i_ref)); |
| 0 | 1634 byte_i_ref += 2; |
| 1635 | |
| 1636 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1637 ("num_annotations=%d", num_annotations)); | |
| 1638 | |
| 1639 int calc_num_annotations = 0; | |
| 1640 for (; calc_num_annotations < num_annotations; calc_num_annotations++) { | |
| 1641 if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray, | |
| 1642 byte_i_ref, THREAD)) { | |
| 1643 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1644 ("bad annotation_struct at %d", calc_num_annotations)); | |
| 605 | 1645 // propagate failure back to caller |
| 0 | 1646 return false; |
| 1647 } | |
| 1648 } | |
| 1649 assert(num_annotations == calc_num_annotations, "sanity check"); | |
| 1650 | |
| 1651 return true; | |
| 1652 } // end rewrite_cp_refs_in_annotations_typeArray() | |
| 1653 | |
| 1654 | |
| 1655 // Rewrite constant pool references in the annotation struct portion of | |
| 1656 // an annotations_typeArray. This "structure" is from section 4.8.15 of | |
| 1657 // the 2nd-edition of the VM spec: | |
| 1658 // | |
| 1659 // struct annotation { | |
| 1660 // u2 type_index; | |
| 1661 // u2 num_element_value_pairs; | |
| 1662 // { | |
| 1663 // u2 element_name_index; | |
| 1664 // element_value value; | |
| 1665 // } element_value_pairs[num_element_value_pairs]; | |
| 1666 // } | |
| 1667 // | |
| 1668 bool VM_RedefineClasses::rewrite_cp_refs_in_annotation_struct( | |
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1669 AnnotationArray* annotations_typeArray, int &byte_i_ref, TRAPS) { |
| 0 | 1670 if ((byte_i_ref + 2 + 2) > annotations_typeArray->length()) { |
| 1671 // not enough room for smallest annotation_struct | |
| 1672 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1673 ("length() is too small for annotation_struct")); | |
| 1674 return false; | |
| 1675 } | |
| 1676 | |
| 1677 u2 type_index = rewrite_cp_ref_in_annotation_data(annotations_typeArray, | |
| 1678 byte_i_ref, "mapped old type_index=%d", THREAD); | |
| 1679 | |
| 1680 u2 num_element_value_pairs = Bytes::get_Java_u2((address) | |
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1681 annotations_typeArray->adr_at(byte_i_ref)); |
| 0 | 1682 byte_i_ref += 2; |
| 1683 | |
| 1684 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1685 ("type_index=%d num_element_value_pairs=%d", type_index, | |
| 1686 num_element_value_pairs)); | |
| 1687 | |
| 1688 int calc_num_element_value_pairs = 0; | |
| 1689 for (; calc_num_element_value_pairs < num_element_value_pairs; | |
| 1690 calc_num_element_value_pairs++) { | |
| 1691 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1692 // not enough room for another element_name_index, let alone | |
| 1693 // the rest of another component | |
| 1694 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1695 ("length() is too small for element_name_index")); | |
| 1696 return false; | |
| 1697 } | |
| 1698 | |
| 1699 u2 element_name_index = rewrite_cp_ref_in_annotation_data( | |
| 1700 annotations_typeArray, byte_i_ref, | |
| 1701 "mapped old element_name_index=%d", THREAD); | |
| 1702 | |
| 1703 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1704 ("element_name_index=%d", element_name_index)); | |
| 1705 | |
| 1706 if (!rewrite_cp_refs_in_element_value(annotations_typeArray, | |
| 1707 byte_i_ref, THREAD)) { | |
| 1708 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1709 ("bad element_value at %d", calc_num_element_value_pairs)); | |
| 605 | 1710 // propagate failure back to caller |
| 0 | 1711 return false; |
| 1712 } | |
| 1713 } // end for each component | |
| 1714 assert(num_element_value_pairs == calc_num_element_value_pairs, | |
| 1715 "sanity check"); | |
| 1716 | |
| 1717 return true; | |
| 1718 } // end rewrite_cp_refs_in_annotation_struct() | |
| 1719 | |
| 1720 | |
| 1721 // Rewrite a constant pool reference at the current position in | |
| 1722 // annotations_typeArray if needed. Returns the original constant | |
| 1723 // pool reference if a rewrite was not needed or the new constant | |
| 1724 // pool reference if a rewrite was needed. | |
| 1725 u2 VM_RedefineClasses::rewrite_cp_ref_in_annotation_data( | |
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1726 AnnotationArray* annotations_typeArray, int &byte_i_ref, |
| 0 | 1727 const char * trace_mesg, TRAPS) { |
| 1728 | |
| 1729 address cp_index_addr = (address) | |
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1730 annotations_typeArray->adr_at(byte_i_ref); |
| 0 | 1731 u2 old_cp_index = Bytes::get_Java_u2(cp_index_addr); |
| 1732 u2 new_cp_index = find_new_index(old_cp_index); | |
| 1733 if (new_cp_index != 0) { | |
| 1734 RC_TRACE_WITH_THREAD(0x02000000, THREAD, (trace_mesg, old_cp_index)); | |
| 1735 Bytes::put_Java_u2(cp_index_addr, new_cp_index); | |
| 1736 old_cp_index = new_cp_index; | |
| 1737 } | |
| 1738 byte_i_ref += 2; | |
| 1739 return old_cp_index; | |
| 1740 } | |
| 1741 | |
| 1742 | |
| 1743 // Rewrite constant pool references in the element_value portion of an | |
| 1744 // annotations_typeArray. This "structure" is from section 4.8.15.1 of | |
| 1745 // the 2nd-edition of the VM spec: | |
| 1746 // | |
| 1747 // struct element_value { | |
| 1748 // u1 tag; | |
| 1749 // union { | |
| 1750 // u2 const_value_index; | |
| 1751 // { | |
| 1752 // u2 type_name_index; | |
| 1753 // u2 const_name_index; | |
| 1754 // } enum_const_value; | |
| 1755 // u2 class_info_index; | |
| 1756 // annotation annotation_value; | |
| 1757 // struct { | |
| 1758 // u2 num_values; | |
| 1759 // element_value values[num_values]; | |
| 1760 // } array_value; | |
| 1761 // } value; | |
| 1762 // } | |
| 1763 // | |
| 1764 bool VM_RedefineClasses::rewrite_cp_refs_in_element_value( | |
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1765 AnnotationArray* annotations_typeArray, int &byte_i_ref, TRAPS) { |
| 0 | 1766 |
| 1767 if ((byte_i_ref + 1) > annotations_typeArray->length()) { | |
| 1768 // not enough room for a tag let alone the rest of an element_value | |
| 1769 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1770 ("length() is too small for a tag")); | |
| 1771 return false; | |
| 1772 } | |
| 1773 | |
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1774 u1 tag = annotations_typeArray->at(byte_i_ref); |
| 0 | 1775 byte_i_ref++; |
| 1776 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("tag='%c'", tag)); | |
| 1777 | |
| 1778 switch (tag) { | |
| 1779 // These BaseType tag values are from Table 4.2 in VM spec: | |
| 1780 case 'B': // byte | |
| 1781 case 'C': // char | |
| 1782 case 'D': // double | |
| 1783 case 'F': // float | |
| 1784 case 'I': // int | |
| 1785 case 'J': // long | |
| 1786 case 'S': // short | |
| 1787 case 'Z': // boolean | |
| 1788 | |
| 1789 // The remaining tag values are from Table 4.8 in the 2nd-edition of | |
| 1790 // the VM spec: | |
| 1791 case 's': | |
| 1792 { | |
| 1793 // For the above tag values (including the BaseType values), | |
| 1794 // value.const_value_index is right union field. | |
| 1795 | |
| 1796 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1797 // not enough room for a const_value_index | |
| 1798 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1799 ("length() is too small for a const_value_index")); | |
| 1800 return false; | |
| 1801 } | |
| 1802 | |
| 1803 u2 const_value_index = rewrite_cp_ref_in_annotation_data( | |
| 1804 annotations_typeArray, byte_i_ref, | |
| 1805 "mapped old const_value_index=%d", THREAD); | |
| 1806 | |
| 1807 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1808 ("const_value_index=%d", const_value_index)); | |
| 1809 } break; | |
| 1810 | |
| 1811 case 'e': | |
| 1812 { | |
| 1813 // for the above tag value, value.enum_const_value is right union field | |
| 1814 | |
| 1815 if ((byte_i_ref + 4) > annotations_typeArray->length()) { | |
| 1816 // not enough room for a enum_const_value | |
| 1817 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1818 ("length() is too small for a enum_const_value")); | |
| 1819 return false; | |
| 1820 } | |
| 1821 | |
| 1822 u2 type_name_index = rewrite_cp_ref_in_annotation_data( | |
| 1823 annotations_typeArray, byte_i_ref, | |
| 1824 "mapped old type_name_index=%d", THREAD); | |
| 1825 | |
| 1826 u2 const_name_index = rewrite_cp_ref_in_annotation_data( | |
| 1827 annotations_typeArray, byte_i_ref, | |
| 1828 "mapped old const_name_index=%d", THREAD); | |
| 1829 | |
| 1830 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1831 ("type_name_index=%d const_name_index=%d", type_name_index, | |
| 1832 const_name_index)); | |
| 1833 } break; | |
| 1834 | |
| 1835 case 'c': | |
| 1836 { | |
| 1837 // for the above tag value, value.class_info_index is right union field | |
| 1838 | |
| 1839 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1840 // not enough room for a class_info_index | |
| 1841 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1842 ("length() is too small for a class_info_index")); | |
| 1843 return false; | |
| 1844 } | |
| 1845 | |
| 1846 u2 class_info_index = rewrite_cp_ref_in_annotation_data( | |
| 1847 annotations_typeArray, byte_i_ref, | |
| 1848 "mapped old class_info_index=%d", THREAD); | |
| 1849 | |
| 1850 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1851 ("class_info_index=%d", class_info_index)); | |
| 1852 } break; | |
| 1853 | |
| 1854 case '@': | |
| 1855 // For the above tag value, value.attr_value is the right union | |
| 1856 // field. This is a nested annotation. | |
| 1857 if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray, | |
| 1858 byte_i_ref, THREAD)) { | |
| 605 | 1859 // propagate failure back to caller |
| 0 | 1860 return false; |
| 1861 } | |
| 1862 break; | |
| 1863 | |
| 1864 case '[': | |
| 1865 { | |
| 1866 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
| 1867 // not enough room for a num_values field | |
| 1868 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1869 ("length() is too small for a num_values field")); | |
| 1870 return false; | |
| 1871 } | |
| 1872 | |
| 1873 // For the above tag value, value.array_value is the right union | |
| 1874 // field. This is an array of nested element_value. | |
| 1875 u2 num_values = Bytes::get_Java_u2((address) | |
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1876 annotations_typeArray->adr_at(byte_i_ref)); |
| 0 | 1877 byte_i_ref += 2; |
| 1878 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("num_values=%d", num_values)); | |
| 1879 | |
| 1880 int calc_num_values = 0; | |
| 1881 for (; calc_num_values < num_values; calc_num_values++) { | |
| 1882 if (!rewrite_cp_refs_in_element_value( | |
| 1883 annotations_typeArray, byte_i_ref, THREAD)) { | |
| 1884 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1885 ("bad nested element_value at %d", calc_num_values)); | |
| 605 | 1886 // propagate failure back to caller |
| 0 | 1887 return false; |
| 1888 } | |
| 1889 } | |
| 1890 assert(num_values == calc_num_values, "sanity check"); | |
| 1891 } break; | |
| 1892 | |
| 1893 default: | |
| 1894 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("bad tag=0x%x", tag)); | |
| 1895 return false; | |
| 1896 } // end decode tag field | |
| 1897 | |
| 1898 return true; | |
| 1899 } // end rewrite_cp_refs_in_element_value() | |
| 1900 | |
| 1901 | |
| 1902 // Rewrite constant pool references in a fields_annotations field. | |
| 1903 bool VM_RedefineClasses::rewrite_cp_refs_in_fields_annotations( | |
| 1904 instanceKlassHandle scratch_class, TRAPS) { | |
| 1905 | |
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1906 Annotations* sca = scratch_class->annotations(); |
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1907 if (sca == NULL) return true; |
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1908 |
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1909 Array<AnnotationArray*>* fields_annotations = sca->fields_annotations(); |
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1910 |
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1911 if (fields_annotations == NULL || fields_annotations->length() == 0) { |
| 0 | 1912 // no fields_annotations so nothing to do |
| 1913 return true; | |
| 1914 } | |
| 1915 | |
| 1916 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1917 ("fields_annotations length=%d", fields_annotations->length())); | |
| 1918 | |
| 1919 for (int i = 0; i < fields_annotations->length(); i++) { | |
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1920 AnnotationArray* field_annotations = fields_annotations->at(i); |
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1921 if (field_annotations == NULL || field_annotations->length() == 0) { |
| 0 | 1922 // this field does not have any annotations so skip it |
| 1923 continue; | |
| 1924 } | |
| 1925 | |
| 1926 int byte_i = 0; // byte index into field_annotations | |
| 1927 if (!rewrite_cp_refs_in_annotations_typeArray(field_annotations, byte_i, | |
| 1928 THREAD)) { | |
| 1929 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1930 ("bad field_annotations at %d", i)); | |
| 605 | 1931 // propagate failure back to caller |
| 0 | 1932 return false; |
| 1933 } | |
| 1934 } | |
| 1935 | |
| 1936 return true; | |
| 1937 } // end rewrite_cp_refs_in_fields_annotations() | |
| 1938 | |
| 1939 | |
| 1940 // Rewrite constant pool references in a methods_annotations field. | |
| 1941 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_annotations( | |
| 1942 instanceKlassHandle scratch_class, TRAPS) { | |
| 1943 | |
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1944 Annotations* sca = scratch_class->annotations(); |
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1945 if (sca == NULL) return true; |
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1946 |
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1947 Array<AnnotationArray*>* methods_annotations = sca->methods_annotations(); |
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1948 |
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1949 if (methods_annotations == NULL || methods_annotations->length() == 0) { |
| 0 | 1950 // no methods_annotations so nothing to do |
| 1951 return true; | |
| 1952 } | |
| 1953 | |
| 1954 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1955 ("methods_annotations length=%d", methods_annotations->length())); | |
| 1956 | |
| 1957 for (int i = 0; i < methods_annotations->length(); i++) { | |
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1958 AnnotationArray* method_annotations = methods_annotations->at(i); |
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1959 if (method_annotations == NULL || method_annotations->length() == 0) { |
| 0 | 1960 // this method does not have any annotations so skip it |
| 1961 continue; | |
| 1962 } | |
| 1963 | |
| 1964 int byte_i = 0; // byte index into method_annotations | |
| 1965 if (!rewrite_cp_refs_in_annotations_typeArray(method_annotations, byte_i, | |
| 1966 THREAD)) { | |
| 1967 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 1968 ("bad method_annotations at %d", i)); | |
| 605 | 1969 // propagate failure back to caller |
| 0 | 1970 return false; |
| 1971 } | |
| 1972 } | |
| 1973 | |
| 1974 return true; | |
| 1975 } // end rewrite_cp_refs_in_methods_annotations() | |
| 1976 | |
| 1977 | |
| 1978 // Rewrite constant pool references in a methods_parameter_annotations | |
| 1979 // field. This "structure" is adapted from the | |
| 1980 // RuntimeVisibleParameterAnnotations_attribute described in section | |
| 1981 // 4.8.17 of the 2nd-edition of the VM spec: | |
| 1982 // | |
| 1983 // methods_parameter_annotations_typeArray { | |
| 1984 // u1 num_parameters; | |
| 1985 // { | |
| 1986 // u2 num_annotations; | |
| 1987 // annotation annotations[num_annotations]; | |
| 1988 // } parameter_annotations[num_parameters]; | |
| 1989 // } | |
| 1990 // | |
| 1991 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_parameter_annotations( | |
| 1992 instanceKlassHandle scratch_class, TRAPS) { | |
| 1993 | |
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1994 Annotations* sca = scratch_class->annotations(); |
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1995 if (sca == NULL) return true; |
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1996 |
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1997 Array<AnnotationArray*>* methods_parameter_annotations = |
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1998 sca->methods_parameter_annotations(); |
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1999 |
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2000 if (methods_parameter_annotations == NULL |
| 0 | 2001 || methods_parameter_annotations->length() == 0) { |
| 2002 // no methods_parameter_annotations so nothing to do | |
| 2003 return true; | |
| 2004 } | |
| 2005 | |
| 2006 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2007 ("methods_parameter_annotations length=%d", | |
| 2008 methods_parameter_annotations->length())); | |
| 2009 | |
| 2010 for (int i = 0; i < methods_parameter_annotations->length(); i++) { | |
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2011 AnnotationArray* method_parameter_annotations = methods_parameter_annotations->at(i); |
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2012 if (method_parameter_annotations == NULL |
| 0 | 2013 || method_parameter_annotations->length() == 0) { |
| 2014 // this method does not have any parameter annotations so skip it | |
| 2015 continue; | |
| 2016 } | |
| 2017 | |
| 2018 if (method_parameter_annotations->length() < 1) { | |
| 2019 // not enough room for a num_parameters field | |
| 2020 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2021 ("length() is too small for a num_parameters field at %d", i)); | |
| 2022 return false; | |
| 2023 } | |
| 2024 | |
| 2025 int byte_i = 0; // byte index into method_parameter_annotations | |
| 2026 | |
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2027 u1 num_parameters = method_parameter_annotations->at(byte_i); |
| 0 | 2028 byte_i++; |
| 2029 | |
| 2030 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2031 ("num_parameters=%d", num_parameters)); | |
| 2032 | |
| 2033 int calc_num_parameters = 0; | |
| 2034 for (; calc_num_parameters < num_parameters; calc_num_parameters++) { | |
| 2035 if (!rewrite_cp_refs_in_annotations_typeArray( | |
| 2036 method_parameter_annotations, byte_i, THREAD)) { | |
| 2037 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2038 ("bad method_parameter_annotations at %d", calc_num_parameters)); | |
| 605 | 2039 // propagate failure back to caller |
| 0 | 2040 return false; |
| 2041 } | |
| 2042 } | |
| 2043 assert(num_parameters == calc_num_parameters, "sanity check"); | |
| 2044 } | |
| 2045 | |
| 2046 return true; | |
| 2047 } // end rewrite_cp_refs_in_methods_parameter_annotations() | |
| 2048 | |
| 2049 | |
| 2050 // Rewrite constant pool references in a methods_default_annotations | |
| 2051 // field. This "structure" is adapted from the AnnotationDefault_attribute | |
| 2052 // that is described in section 4.8.19 of the 2nd-edition of the VM spec: | |
| 2053 // | |
| 2054 // methods_default_annotations_typeArray { | |
| 2055 // element_value default_value; | |
| 2056 // } | |
| 2057 // | |
| 2058 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_default_annotations( | |
| 2059 instanceKlassHandle scratch_class, TRAPS) { | |
| 2060 | |
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2061 Annotations* sca = scratch_class->annotations(); |
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2062 if (sca == NULL) return true; |
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2063 |
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2064 Array<AnnotationArray*>* methods_default_annotations = |
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2065 sca->methods_default_annotations(); |
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2066 |
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2067 if (methods_default_annotations == NULL |
| 0 | 2068 || methods_default_annotations->length() == 0) { |
| 2069 // no methods_default_annotations so nothing to do | |
| 2070 return true; | |
| 2071 } | |
| 2072 | |
| 2073 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2074 ("methods_default_annotations length=%d", | |
| 2075 methods_default_annotations->length())); | |
| 2076 | |
| 2077 for (int i = 0; i < methods_default_annotations->length(); i++) { | |
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2078 AnnotationArray* method_default_annotations = methods_default_annotations->at(i); |
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2079 if (method_default_annotations == NULL |
| 0 | 2080 || method_default_annotations->length() == 0) { |
| 2081 // this method does not have any default annotations so skip it | |
| 2082 continue; | |
| 2083 } | |
| 2084 | |
| 2085 int byte_i = 0; // byte index into method_default_annotations | |
| 2086 | |
| 2087 if (!rewrite_cp_refs_in_element_value( | |
| 2088 method_default_annotations, byte_i, THREAD)) { | |
| 2089 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
| 2090 ("bad default element_value at %d", i)); | |
| 605 | 2091 // propagate failure back to caller |
| 0 | 2092 return false; |
| 2093 } | |
| 2094 } | |
| 2095 | |
| 2096 return true; | |
| 2097 } // end rewrite_cp_refs_in_methods_default_annotations() | |
| 2098 | |
| 2099 | |
| 2100 // Rewrite constant pool references in the method's stackmap table. | |
| 2101 // These "structures" are adapted from the StackMapTable_attribute that | |
| 2102 // is described in section 4.8.4 of the 6.0 version of the VM spec | |
| 2103 // (dated 2005.10.26): | |
| 2104 // file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf | |
| 2105 // | |
| 2106 // stack_map { | |
| 2107 // u2 number_of_entries; | |
| 2108 // stack_map_frame entries[number_of_entries]; | |
| 2109 // } | |
| 2110 // | |
| 2111 void VM_RedefineClasses::rewrite_cp_refs_in_stack_map_table( | |
| 2112 methodHandle method, TRAPS) { | |
| 2113 | |
| 2114 if (!method->has_stackmap_table()) { | |
| 2115 return; | |
| 2116 } | |
| 2117 | |
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2118 AnnotationArray* stackmap_data = method->stackmap_data(); |
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2119 address stackmap_p = (address)stackmap_data->adr_at(0); |
| 0 | 2120 address stackmap_end = stackmap_p + stackmap_data->length(); |
| 2121 | |
| 2122 assert(stackmap_p + 2 <= stackmap_end, "no room for number_of_entries"); | |
| 2123 u2 number_of_entries = Bytes::get_Java_u2(stackmap_p); | |
| 2124 stackmap_p += 2; | |
| 2125 | |
| 2126 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2127 ("number_of_entries=%u", number_of_entries)); | |
| 2128 | |
| 2129 // walk through each stack_map_frame | |
| 2130 u2 calc_number_of_entries = 0; | |
| 2131 for (; calc_number_of_entries < number_of_entries; calc_number_of_entries++) { | |
| 2132 // The stack_map_frame structure is a u1 frame_type followed by | |
| 2133 // 0 or more bytes of data: | |
| 2134 // | |
| 2135 // union stack_map_frame { | |
| 2136 // same_frame; | |
| 2137 // same_locals_1_stack_item_frame; | |
| 2138 // same_locals_1_stack_item_frame_extended; | |
| 2139 // chop_frame; | |
| 2140 // same_frame_extended; | |
| 2141 // append_frame; | |
| 2142 // full_frame; | |
| 2143 // } | |
| 2144 | |
| 2145 assert(stackmap_p + 1 <= stackmap_end, "no room for frame_type"); | |
| 2146 // The Linux compiler does not like frame_type to be u1 or u2. It | |
| 2147 // issues the following warning for the first if-statement below: | |
| 2148 // | |
| 2149 // "warning: comparison is always true due to limited range of data type" | |
| 2150 // | |
| 2151 u4 frame_type = *stackmap_p; | |
| 2152 stackmap_p++; | |
| 2153 | |
| 2154 // same_frame { | |
| 2155 // u1 frame_type = SAME; /* 0-63 */ | |
| 2156 // } | |
| 2157 if (frame_type >= 0 && frame_type <= 63) { | |
| 2158 // nothing more to do for same_frame | |
| 2159 } | |
| 2160 | |
| 2161 // same_locals_1_stack_item_frame { | |
| 2162 // u1 frame_type = SAME_LOCALS_1_STACK_ITEM; /* 64-127 */ | |
| 2163 // verification_type_info stack[1]; | |
| 2164 // } | |
| 2165 else if (frame_type >= 64 && frame_type <= 127) { | |
| 2166 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2167 calc_number_of_entries, frame_type, THREAD); | |
| 2168 } | |
| 2169 | |
| 2170 // reserved for future use | |
| 2171 else if (frame_type >= 128 && frame_type <= 246) { | |
| 2172 // nothing more to do for reserved frame_types | |
| 2173 } | |
| 2174 | |
| 2175 // same_locals_1_stack_item_frame_extended { | |
| 2176 // u1 frame_type = SAME_LOCALS_1_STACK_ITEM_EXTENDED; /* 247 */ | |
| 2177 // u2 offset_delta; | |
| 2178 // verification_type_info stack[1]; | |
| 2179 // } | |
| 2180 else if (frame_type == 247) { | |
| 2181 stackmap_p += 2; | |
| 2182 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2183 calc_number_of_entries, frame_type, THREAD); | |
| 2184 } | |
| 2185 | |
| 2186 // chop_frame { | |
| 2187 // u1 frame_type = CHOP; /* 248-250 */ | |
| 2188 // u2 offset_delta; | |
| 2189 // } | |
| 2190 else if (frame_type >= 248 && frame_type <= 250) { | |
| 2191 stackmap_p += 2; | |
| 2192 } | |
| 2193 | |
| 2194 // same_frame_extended { | |
| 2195 // u1 frame_type = SAME_FRAME_EXTENDED; /* 251*/ | |
| 2196 // u2 offset_delta; | |
| 2197 // } | |
| 2198 else if (frame_type == 251) { | |
| 2199 stackmap_p += 2; | |
| 2200 } | |
| 2201 | |
| 2202 // append_frame { | |
| 2203 // u1 frame_type = APPEND; /* 252-254 */ | |
| 2204 // u2 offset_delta; | |
| 2205 // verification_type_info locals[frame_type - 251]; | |
| 2206 // } | |
| 2207 else if (frame_type >= 252 && frame_type <= 254) { | |
| 2208 assert(stackmap_p + 2 <= stackmap_end, | |
| 2209 "no room for offset_delta"); | |
| 2210 stackmap_p += 2; | |
| 2211 u1 len = frame_type - 251; | |
| 2212 for (u1 i = 0; i < len; i++) { | |
| 2213 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2214 calc_number_of_entries, frame_type, THREAD); | |
| 2215 } | |
| 2216 } | |
| 2217 | |
| 2218 // full_frame { | |
| 2219 // u1 frame_type = FULL_FRAME; /* 255 */ | |
| 2220 // u2 offset_delta; | |
| 2221 // u2 number_of_locals; | |
| 2222 // verification_type_info locals[number_of_locals]; | |
| 2223 // u2 number_of_stack_items; | |
| 2224 // verification_type_info stack[number_of_stack_items]; | |
| 2225 // } | |
| 2226 else if (frame_type == 255) { | |
| 2227 assert(stackmap_p + 2 + 2 <= stackmap_end, | |
| 2228 "no room for smallest full_frame"); | |
| 2229 stackmap_p += 2; | |
| 2230 | |
| 2231 u2 number_of_locals = Bytes::get_Java_u2(stackmap_p); | |
| 2232 stackmap_p += 2; | |
| 2233 | |
| 2234 for (u2 locals_i = 0; locals_i < number_of_locals; locals_i++) { | |
| 2235 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2236 calc_number_of_entries, frame_type, THREAD); | |
| 2237 } | |
| 2238 | |
| 2239 // Use the largest size for the number_of_stack_items, but only get | |
| 2240 // the right number of bytes. | |
| 2241 u2 number_of_stack_items = Bytes::get_Java_u2(stackmap_p); | |
| 2242 stackmap_p += 2; | |
| 2243 | |
| 2244 for (u2 stack_i = 0; stack_i < number_of_stack_items; stack_i++) { | |
| 2245 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
| 2246 calc_number_of_entries, frame_type, THREAD); | |
| 2247 } | |
| 2248 } | |
| 2249 } // end while there is a stack_map_frame | |
| 2250 assert(number_of_entries == calc_number_of_entries, "sanity check"); | |
| 2251 } // end rewrite_cp_refs_in_stack_map_table() | |
| 2252 | |
| 2253 | |
| 2254 // Rewrite constant pool references in the verification type info | |
| 2255 // portion of the method's stackmap table. These "structures" are | |
| 2256 // adapted from the StackMapTable_attribute that is described in | |
| 2257 // section 4.8.4 of the 6.0 version of the VM spec (dated 2005.10.26): | |
| 2258 // file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf | |
| 2259 // | |
| 2260 // The verification_type_info structure is a u1 tag followed by 0 or | |
| 2261 // more bytes of data: | |
| 2262 // | |
| 2263 // union verification_type_info { | |
| 2264 // Top_variable_info; | |
| 2265 // Integer_variable_info; | |
| 2266 // Float_variable_info; | |
| 2267 // Long_variable_info; | |
| 2268 // Double_variable_info; | |
| 2269 // Null_variable_info; | |
| 2270 // UninitializedThis_variable_info; | |
| 2271 // Object_variable_info; | |
| 2272 // Uninitialized_variable_info; | |
| 2273 // } | |
| 2274 // | |
| 2275 void VM_RedefineClasses::rewrite_cp_refs_in_verification_type_info( | |
| 2276 address& stackmap_p_ref, address stackmap_end, u2 frame_i, | |
| 2277 u1 frame_type, TRAPS) { | |
| 2278 | |
| 2279 assert(stackmap_p_ref + 1 <= stackmap_end, "no room for tag"); | |
| 2280 u1 tag = *stackmap_p_ref; | |
| 2281 stackmap_p_ref++; | |
| 2282 | |
| 2283 switch (tag) { | |
| 2284 // Top_variable_info { | |
| 2285 // u1 tag = ITEM_Top; /* 0 */ | |
| 2286 // } | |
| 2287 // verificationType.hpp has zero as ITEM_Bogus instead of ITEM_Top | |
| 2288 case 0: // fall through | |
| 2289 | |
| 2290 // Integer_variable_info { | |
| 2291 // u1 tag = ITEM_Integer; /* 1 */ | |
| 2292 // } | |
| 2293 case ITEM_Integer: // fall through | |
| 2294 | |
| 2295 // Float_variable_info { | |
| 2296 // u1 tag = ITEM_Float; /* 2 */ | |
| 2297 // } | |
| 2298 case ITEM_Float: // fall through | |
| 2299 | |
| 2300 // Double_variable_info { | |
| 2301 // u1 tag = ITEM_Double; /* 3 */ | |
| 2302 // } | |
| 2303 case ITEM_Double: // fall through | |
| 2304 | |
| 2305 // Long_variable_info { | |
| 2306 // u1 tag = ITEM_Long; /* 4 */ | |
| 2307 // } | |
| 2308 case ITEM_Long: // fall through | |
| 2309 | |
| 2310 // Null_variable_info { | |
| 2311 // u1 tag = ITEM_Null; /* 5 */ | |
| 2312 // } | |
| 2313 case ITEM_Null: // fall through | |
| 2314 | |
| 2315 // UninitializedThis_variable_info { | |
| 2316 // u1 tag = ITEM_UninitializedThis; /* 6 */ | |
| 2317 // } | |
| 2318 case ITEM_UninitializedThis: | |
| 2319 // nothing more to do for the above tag types | |
| 2320 break; | |
| 2321 | |
| 2322 // Object_variable_info { | |
| 2323 // u1 tag = ITEM_Object; /* 7 */ | |
| 2324 // u2 cpool_index; | |
| 2325 // } | |
| 2326 case ITEM_Object: | |
| 2327 { | |
| 2328 assert(stackmap_p_ref + 2 <= stackmap_end, "no room for cpool_index"); | |
| 2329 u2 cpool_index = Bytes::get_Java_u2(stackmap_p_ref); | |
| 2330 u2 new_cp_index = find_new_index(cpool_index); | |
| 2331 if (new_cp_index != 0) { | |
| 2332 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2333 ("mapped old cpool_index=%d", cpool_index)); | |
| 2334 Bytes::put_Java_u2(stackmap_p_ref, new_cp_index); | |
| 2335 cpool_index = new_cp_index; | |
| 2336 } | |
| 2337 stackmap_p_ref += 2; | |
| 2338 | |
| 2339 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2340 ("frame_i=%u, frame_type=%u, cpool_index=%d", frame_i, | |
| 2341 frame_type, cpool_index)); | |
| 2342 } break; | |
| 2343 | |
| 2344 // Uninitialized_variable_info { | |
| 2345 // u1 tag = ITEM_Uninitialized; /* 8 */ | |
| 2346 // u2 offset; | |
| 2347 // } | |
| 2348 case ITEM_Uninitialized: | |
| 2349 assert(stackmap_p_ref + 2 <= stackmap_end, "no room for offset"); | |
| 2350 stackmap_p_ref += 2; | |
| 2351 break; | |
| 2352 | |
| 2353 default: | |
| 2354 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
| 2355 ("frame_i=%u, frame_type=%u, bad tag=0x%x", frame_i, frame_type, tag)); | |
| 2356 ShouldNotReachHere(); | |
| 2357 break; | |
| 2358 } // end switch (tag) | |
| 2359 } // end rewrite_cp_refs_in_verification_type_info() | |
| 2360 | |
| 2361 | |
| 2362 // Change the constant pool associated with klass scratch_class to | |
| 2363 // scratch_cp. If shrink is true, then scratch_cp_length elements | |
| 2364 // are copied from scratch_cp to a smaller constant pool and the | |
| 2365 // smaller constant pool is associated with scratch_class. | |
| 2366 void VM_RedefineClasses::set_new_constant_pool( | |
|
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2367 ClassLoaderData* loader_data, |
| 0 | 2368 instanceKlassHandle scratch_class, constantPoolHandle scratch_cp, |
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2369 int scratch_cp_length, TRAPS) { |
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2370 assert(scratch_cp->length() >= scratch_cp_length, "sanity check"); |
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2371 |
|
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2372 // scratch_cp is a merged constant pool and has enough space for a |
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2373 // worst case merge situation. We want to associate the minimum |
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2374 // sized constant pool with the klass to save space. |
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2375 constantPoolHandle smaller_cp(THREAD, |
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2376 ConstantPool::allocate(loader_data, scratch_cp_length, THREAD)); |
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2377 |
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2378 // preserve version() value in the smaller copy |
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2379 int version = scratch_cp->version(); |
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2380 assert(version != 0, "sanity check"); |
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2381 smaller_cp->set_version(version); |
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2382 |
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2383 scratch_cp->copy_cp_to(1, scratch_cp_length - 1, smaller_cp, 1, THREAD); |
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2384 scratch_cp = smaller_cp; |
| 0 | 2385 |
| 2386 // attach new constant pool to klass | |
| 2387 scratch_cp->set_pool_holder(scratch_class()); | |
| 2388 | |
| 2389 // attach klass to new constant pool | |
| 2390 scratch_class->set_constants(scratch_cp()); | |
| 2391 | |
| 2392 int i; // for portability | |
| 2393 | |
| 2394 // update each field in klass to use new constant pool indices as needed | |
| 3938 | 2395 for (JavaFieldStream fs(scratch_class); !fs.done(); fs.next()) { |
| 2396 jshort cur_index = fs.name_index(); | |
| 0 | 2397 jshort new_index = find_new_index(cur_index); |
| 2398 if (new_index != 0) { | |
| 2399 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2400 ("field-name_index change: %d to %d", cur_index, new_index)); | |
| 3938 | 2401 fs.set_name_index(new_index); |
| 0 | 2402 } |
| 3938 | 2403 cur_index = fs.signature_index(); |
| 0 | 2404 new_index = find_new_index(cur_index); |
| 2405 if (new_index != 0) { | |
| 2406 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2407 ("field-signature_index change: %d to %d", cur_index, new_index)); | |
| 3938 | 2408 fs.set_signature_index(new_index); |
| 0 | 2409 } |
| 3938 | 2410 cur_index = fs.initval_index(); |
| 0 | 2411 new_index = find_new_index(cur_index); |
| 2412 if (new_index != 0) { | |
| 2413 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2414 ("field-initval_index change: %d to %d", cur_index, new_index)); | |
| 3938 | 2415 fs.set_initval_index(new_index); |
| 0 | 2416 } |
| 3938 | 2417 cur_index = fs.generic_signature_index(); |
| 0 | 2418 new_index = find_new_index(cur_index); |
| 2419 if (new_index != 0) { | |
| 2420 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2421 ("field-generic_signature change: %d to %d", cur_index, new_index)); | |
| 3938 | 2422 fs.set_generic_signature_index(new_index); |
| 0 | 2423 } |
| 2424 } // end for each field | |
| 2425 | |
| 2426 // Update constant pool indices in the inner classes info to use | |
| 2427 // new constant indices as needed. The inner classes info is a | |
| 2428 // quadruple: | |
| 2429 // (inner_class_info, outer_class_info, inner_name, inner_access_flags) | |
|
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2430 InnerClassesIterator iter(scratch_class); |
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2431 for (; !iter.done(); iter.next()) { |
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2432 int cur_index = iter.inner_class_info_index(); |
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2433 if (cur_index == 0) { |
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2434 continue; // JVM spec. allows null inner class refs so skip it |
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2435 } |
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2436 int new_index = find_new_index(cur_index); |
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2437 if (new_index != 0) { |
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2438 RC_TRACE_WITH_THREAD(0x00080000, THREAD, |
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2439 ("inner_class_info change: %d to %d", cur_index, new_index)); |
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2440 iter.set_inner_class_info_index(new_index); |
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2441 } |
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2442 cur_index = iter.outer_class_info_index(); |
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2443 new_index = find_new_index(cur_index); |
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2444 if (new_index != 0) { |
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2445 RC_TRACE_WITH_THREAD(0x00080000, THREAD, |
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2446 ("outer_class_info change: %d to %d", cur_index, new_index)); |
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2447 iter.set_outer_class_info_index(new_index); |
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2448 } |
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2449 cur_index = iter.inner_name_index(); |
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2450 new_index = find_new_index(cur_index); |
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2451 if (new_index != 0) { |
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2452 RC_TRACE_WITH_THREAD(0x00080000, THREAD, |
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2453 ("inner_name change: %d to %d", cur_index, new_index)); |
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2454 iter.set_inner_name_index(new_index); |
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2455 } |
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2456 } // end for each inner class |
| 0 | 2457 |
| 2458 // Attach each method in klass to the new constant pool and update | |
| 2459 // to use new constant pool indices as needed: | |
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2460 Array<Method*>* methods = scratch_class->methods(); |
| 0 | 2461 for (i = methods->length() - 1; i >= 0; i--) { |
|
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2462 methodHandle method(THREAD, methods->at(i)); |
| 0 | 2463 method->set_constants(scratch_cp()); |
| 2464 | |
| 2465 int new_index = find_new_index(method->name_index()); | |
| 2466 if (new_index != 0) { | |
| 2467 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2468 ("method-name_index change: %d to %d", method->name_index(), | |
| 2469 new_index)); | |
| 2470 method->set_name_index(new_index); | |
| 2471 } | |
| 2472 new_index = find_new_index(method->signature_index()); | |
| 2473 if (new_index != 0) { | |
| 2474 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2475 ("method-signature_index change: %d to %d", | |
| 2476 method->signature_index(), new_index)); | |
| 2477 method->set_signature_index(new_index); | |
| 2478 } | |
| 2479 new_index = find_new_index(method->generic_signature_index()); | |
| 2480 if (new_index != 0) { | |
| 2481 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2482 ("method-generic_signature_index change: %d to %d", | |
| 2483 method->generic_signature_index(), new_index)); | |
| 2484 method->set_generic_signature_index(new_index); | |
| 2485 } | |
| 2486 | |
| 2487 // Update constant pool indices in the method's checked exception | |
| 2488 // table to use new constant indices as needed. | |
| 2489 int cext_length = method->checked_exceptions_length(); | |
| 2490 if (cext_length > 0) { | |
| 2491 CheckedExceptionElement * cext_table = | |
| 2492 method->checked_exceptions_start(); | |
| 2493 for (int j = 0; j < cext_length; j++) { | |
| 2494 int cur_index = cext_table[j].class_cp_index; | |
| 2495 int new_index = find_new_index(cur_index); | |
| 2496 if (new_index != 0) { | |
| 2497 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2498 ("cext-class_cp_index change: %d to %d", cur_index, new_index)); | |
| 2499 cext_table[j].class_cp_index = (u2)new_index; | |
| 2500 } | |
| 2501 } // end for each checked exception table entry | |
| 2502 } // end if there are checked exception table entries | |
| 2503 | |
| 2504 // Update each catch type index in the method's exception table | |
| 2505 // to use new constant pool indices as needed. The exception table | |
| 2506 // holds quadruple entries of the form: | |
| 2507 // (beg_bci, end_bci, handler_bci, klass_index) | |
|
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2508 |
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2509 ExceptionTable ex_table(method()); |
|
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2510 int ext_length = ex_table.length(); |
|
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2511 |
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2512 for (int j = 0; j < ext_length; j ++) { |
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2513 int cur_index = ex_table.catch_type_index(j); |
| 0 | 2514 int new_index = find_new_index(cur_index); |
| 2515 if (new_index != 0) { | |
| 2516 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2517 ("ext-klass_index change: %d to %d", cur_index, new_index)); | |
|
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2518 ex_table.set_catch_type_index(j, new_index); |
| 0 | 2519 } |
| 2520 } // end for each exception table entry | |
| 2521 | |
| 2522 // Update constant pool indices in the method's local variable | |
| 2523 // table to use new constant indices as needed. The local variable | |
| 2524 // table hold sextuple entries of the form: | |
| 2525 // (start_pc, length, name_index, descriptor_index, signature_index, slot) | |
| 2526 int lvt_length = method->localvariable_table_length(); | |
| 2527 if (lvt_length > 0) { | |
| 2528 LocalVariableTableElement * lv_table = | |
| 2529 method->localvariable_table_start(); | |
| 2530 for (int j = 0; j < lvt_length; j++) { | |
| 2531 int cur_index = lv_table[j].name_cp_index; | |
| 2532 int new_index = find_new_index(cur_index); | |
| 2533 if (new_index != 0) { | |
| 2534 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2535 ("lvt-name_cp_index change: %d to %d", cur_index, new_index)); | |
| 2536 lv_table[j].name_cp_index = (u2)new_index; | |
| 2537 } | |
| 2538 cur_index = lv_table[j].descriptor_cp_index; | |
| 2539 new_index = find_new_index(cur_index); | |
| 2540 if (new_index != 0) { | |
| 2541 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2542 ("lvt-descriptor_cp_index change: %d to %d", cur_index, | |
| 2543 new_index)); | |
| 2544 lv_table[j].descriptor_cp_index = (u2)new_index; | |
| 2545 } | |
| 2546 cur_index = lv_table[j].signature_cp_index; | |
| 2547 new_index = find_new_index(cur_index); | |
| 2548 if (new_index != 0) { | |
| 2549 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
| 2550 ("lvt-signature_cp_index change: %d to %d", cur_index, new_index)); | |
| 2551 lv_table[j].signature_cp_index = (u2)new_index; | |
| 2552 } | |
| 2553 } // end for each local variable table entry | |
| 2554 } // end if there are local variable table entries | |
| 2555 | |
| 2556 rewrite_cp_refs_in_stack_map_table(method, THREAD); | |
| 2557 } // end for each method | |
| 2558 } // end set_new_constant_pool() | |
| 2559 | |
| 2560 | |
|
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2561 void VM_RedefineClasses::adjust_array_vtable(Klass* k_oop) { |
|
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2562 ArrayKlass* ak = ArrayKlass::cast(k_oop); |
|
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2563 bool trace_name_printed = false; |
|
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2564 ak->vtable()->adjust_method_entries(_matching_old_methods, |
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2565 _matching_new_methods, |
|
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2566 _matching_methods_length, |
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2567 &trace_name_printed); |
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2568 } |
|
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2569 |
| 0 | 2570 // Unevolving classes may point to methods of the_class directly |
| 2571 // from their constant pool caches, itables, and/or vtables. We | |
| 2572 // use the SystemDictionary::classes_do() facility and this helper | |
| 2573 // to fix up these pointers. | |
| 2574 // | |
| 2575 // Note: We currently don't support updating the vtable in | |
| 2576 // arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp. | |
|
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2577 void VM_RedefineClasses::adjust_cpool_cache_and_vtable(Klass* k_oop, |
|
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2578 ClassLoaderData* initiating_loader, |
|
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2579 TRAPS) { |
|
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2580 Klass *k = k_oop; |
| 0 | 2581 if (k->oop_is_instance()) { |
| 2582 HandleMark hm(THREAD); | |
|
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2583 InstanceKlass *ik = (InstanceKlass *) k; |
| 0 | 2584 |
| 2585 // HotSpot specific optimization! HotSpot does not currently | |
| 2586 // support delegation from the bootstrap class loader to a | |
| 2587 // user-defined class loader. This means that if the bootstrap | |
| 2588 // class loader is the initiating class loader, then it will also | |
| 2589 // be the defining class loader. This also means that classes | |
| 2590 // loaded by the bootstrap class loader cannot refer to classes | |
| 2591 // loaded by a user-defined class loader. Note: a user-defined | |
| 2592 // class loader can delegate to the bootstrap class loader. | |
| 2593 // | |
| 2594 // If the current class being redefined has a user-defined class | |
| 2595 // loader as its defining class loader, then we can skip all | |
| 2596 // classes loaded by the bootstrap class loader. | |
| 2597 bool is_user_defined = | |
|
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2598 InstanceKlass::cast(_the_class_oop)->class_loader() != NULL; |
| 0 | 2599 if (is_user_defined && ik->class_loader() == NULL) { |
| 2600 return; | |
| 2601 } | |
| 2602 | |
|
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2603 // If the class being redefined is java.lang.Object, we need to fix all |
|
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2604 // array class vtables also |
|
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2605 if (_the_class_oop == SystemDictionary::Object_klass()) { |
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2606 ik->array_klasses_do(adjust_array_vtable); |
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2607 } |
|
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|
2608 |
| 0 | 2609 // This is a very busy routine. We don't want too much tracing |
| 2610 // printed out. | |
| 2611 bool trace_name_printed = false; | |
| 2612 | |
| 2613 // Very noisy: only enable this call if you are trying to determine | |
| 2614 // that a specific class gets found by this routine. | |
| 2615 // RC_TRACE macro has an embedded ResourceMark | |
| 2616 // RC_TRACE_WITH_THREAD(0x00100000, THREAD, | |
| 2617 // ("adjust check: name=%s", ik->external_name())); | |
| 2618 // trace_name_printed = true; | |
| 2619 | |
| 2620 // Fix the vtable embedded in the_class and subclasses of the_class, | |
| 2621 // if one exists. We discard scratch_class and we don't keep an | |
|
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2622 // InstanceKlass around to hold obsolete methods so we don't have |
|
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2623 // any other InstanceKlass embedded vtables to update. The vtable |
|
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2624 // holds the Method*s for virtual (but not final) methods. |
| 0 | 2625 if (ik->vtable_length() > 0 && ik->is_subtype_of(_the_class_oop)) { |
| 2626 // ik->vtable() creates a wrapper object; rm cleans it up | |
| 2627 ResourceMark rm(THREAD); | |
| 2628 ik->vtable()->adjust_method_entries(_matching_old_methods, | |
| 2629 _matching_new_methods, | |
| 2630 _matching_methods_length, | |
| 2631 &trace_name_printed); | |
| 2632 } | |
| 2633 | |
| 2634 // If the current class has an itable and we are either redefining an | |
| 2635 // interface or if the current class is a subclass of the_class, then | |
| 2636 // we potentially have to fix the itable. If we are redefining an | |
| 2637 // interface, then we have to call adjust_method_entries() for | |
|
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2638 // every InstanceKlass that has an itable since there isn't a |
|
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2639 // subclass relationship between an interface and an InstanceKlass. |
| 6983 | 2640 if (ik->itable_length() > 0 && (_the_class_oop->is_interface() |
| 0 | 2641 || ik->is_subclass_of(_the_class_oop))) { |
| 2642 // ik->itable() creates a wrapper object; rm cleans it up | |
| 2643 ResourceMark rm(THREAD); | |
| 2644 ik->itable()->adjust_method_entries(_matching_old_methods, | |
| 2645 _matching_new_methods, | |
| 2646 _matching_methods_length, | |
| 2647 &trace_name_printed); | |
| 2648 } | |
| 2649 | |
| 2650 // The constant pools in other classes (other_cp) can refer to | |
| 2651 // methods in the_class. We have to update method information in | |
| 2652 // other_cp's cache. If other_cp has a previous version, then we | |
| 2653 // have to repeat the process for each previous version. The | |
|
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2654 // constant pool cache holds the Method*s for non-virtual |
| 0 | 2655 // methods and for virtual, final methods. |
| 2656 // | |
| 2657 // Special case: if the current class is the_class, then new_cp | |
| 2658 // has already been attached to the_class and old_cp has already | |
| 2659 // been added as a previous version. The new_cp doesn't have any | |
| 2660 // cached references to old methods so it doesn't need to be | |
| 2661 // updated. We can simply start with the previous version(s) in | |
| 2662 // that case. | |
| 2663 constantPoolHandle other_cp; | |
|
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2664 ConstantPoolCache* cp_cache; |
| 0 | 2665 |
| 2666 if (k_oop != _the_class_oop) { | |
| 2667 // this klass' constant pool cache may need adjustment | |
| 2668 other_cp = constantPoolHandle(ik->constants()); | |
| 2669 cp_cache = other_cp->cache(); | |
| 2670 if (cp_cache != NULL) { | |
| 2671 cp_cache->adjust_method_entries(_matching_old_methods, | |
| 2672 _matching_new_methods, | |
| 2673 _matching_methods_length, | |
| 2674 &trace_name_printed); | |
| 2675 } | |
| 2676 } | |
| 2677 { | |
| 2678 ResourceMark rm(THREAD); | |
| 2679 // PreviousVersionInfo objects returned via PreviousVersionWalker | |
| 2680 // contain a GrowableArray of handles. We have to clean up the | |
| 2681 // GrowableArray _after_ the PreviousVersionWalker destructor | |
| 2682 // has destroyed the handles. | |
| 2683 { | |
| 2684 // the previous versions' constant pool caches may need adjustment | |
| 2685 PreviousVersionWalker pvw(ik); | |
| 2686 for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); | |
| 2687 pv_info != NULL; pv_info = pvw.next_previous_version()) { | |
| 2688 other_cp = pv_info->prev_constant_pool_handle(); | |
| 2689 cp_cache = other_cp->cache(); | |
| 2690 if (cp_cache != NULL) { | |
| 2691 cp_cache->adjust_method_entries(_matching_old_methods, | |
| 2692 _matching_new_methods, | |
| 2693 _matching_methods_length, | |
| 2694 &trace_name_printed); | |
| 2695 } | |
| 2696 } | |
| 2697 } // pvw is cleaned up | |
| 2698 } // rm is cleaned up | |
| 2699 } | |
| 2700 } | |
| 2701 | |
| 2702 void VM_RedefineClasses::update_jmethod_ids() { | |
| 2703 for (int j = 0; j < _matching_methods_length; ++j) { | |
|
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2704 Method* old_method = _matching_old_methods[j]; |
| 0 | 2705 jmethodID jmid = old_method->find_jmethod_id_or_null(); |
| 2706 if (jmid != NULL) { | |
| 2707 // There is a jmethodID, change it to point to the new method | |
| 2708 methodHandle new_method_h(_matching_new_methods[j]); | |
|
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2709 Method::change_method_associated_with_jmethod_id(jmid, new_method_h()); |
|
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2710 assert(Method::resolve_jmethod_id(jmid) == _matching_new_methods[j], |
| 0 | 2711 "should be replaced"); |
| 2712 } | |
| 2713 } | |
| 2714 } | |
| 2715 | |
| 2716 void VM_RedefineClasses::check_methods_and_mark_as_obsolete( | |
| 2717 BitMap *emcp_methods, int * emcp_method_count_p) { | |
| 2718 *emcp_method_count_p = 0; | |
| 2719 int obsolete_count = 0; | |
| 2720 int old_index = 0; | |
| 2721 for (int j = 0; j < _matching_methods_length; ++j, ++old_index) { | |
|
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2722 Method* old_method = _matching_old_methods[j]; |
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2723 Method* new_method = _matching_new_methods[j]; |
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2724 Method* old_array_method; |
| 0 | 2725 |
| 2726 // Maintain an old_index into the _old_methods array by skipping | |
| 2727 // deleted methods | |
|
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2728 while ((old_array_method = _old_methods->at(old_index)) != old_method) { |
| 0 | 2729 ++old_index; |
| 2730 } | |
| 2731 | |
| 2732 if (MethodComparator::methods_EMCP(old_method, new_method)) { | |
| 2733 // The EMCP definition from JSR-163 requires the bytecodes to be | |
| 2734 // the same with the exception of constant pool indices which may | |
| 2735 // differ. However, the constants referred to by those indices | |
| 2736 // must be the same. | |
| 2737 // | |
| 2738 // We use methods_EMCP() for comparison since constant pool | |
| 2739 // merging can remove duplicate constant pool entries that were | |
| 2740 // present in the old method and removed from the rewritten new | |
| 2741 // method. A faster binary comparison function would consider the | |
| 2742 // old and new methods to be different when they are actually | |
| 2743 // EMCP. | |
| 2744 // | |
| 2745 // The old and new methods are EMCP and you would think that we | |
| 2746 // could get rid of one of them here and now and save some space. | |
| 2747 // However, the concept of EMCP only considers the bytecodes and | |
| 2748 // the constant pool entries in the comparison. Other things, | |
| 2749 // e.g., the line number table (LNT) or the local variable table | |
| 2750 // (LVT) don't count in the comparison. So the new (and EMCP) | |
| 2751 // method can have a new LNT that we need so we can't just | |
| 2752 // overwrite the new method with the old method. | |
| 2753 // | |
| 2754 // When this routine is called, we have already attached the new | |
| 2755 // methods to the_class so the old methods are effectively | |
| 2756 // overwritten. However, if an old method is still executing, | |
| 2757 // then the old method cannot be collected until sometime after | |
| 2758 // the old method call has returned. So the overwriting of old | |
| 2759 // methods by new methods will save us space except for those | |
| 2760 // (hopefully few) old methods that are still executing. | |
| 2761 // | |
|
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2762 // A method refers to a ConstMethod* and this presents another |
|
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2763 // possible avenue to space savings. The ConstMethod* in the |
| 0 | 2764 // new method contains possibly new attributes (LNT, LVT, etc). |
| 2765 // At first glance, it seems possible to save space by replacing | |
|
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2766 // the ConstMethod* in the old method with the ConstMethod* |
| 0 | 2767 // from the new method. The old and new methods would share the |
|
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2768 // same ConstMethod* and we would save the space occupied by |
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2769 // the old ConstMethod*. However, the ConstMethod* contains |
| 0 | 2770 // a back reference to the containing method. Sharing the |
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2771 // ConstMethod* between two methods could lead to confusion in |
| 0 | 2772 // the code that uses the back reference. This would lead to |
| 2773 // brittle code that could be broken in non-obvious ways now or | |
| 2774 // in the future. | |
| 2775 // | |
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2776 // Another possibility is to copy the ConstMethod* from the new |
| 0 | 2777 // method to the old method and then overwrite the new method with |
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2778 // the old method. Since the ConstMethod* contains the bytecodes |
| 0 | 2779 // for the method embedded in the oop, this option would change |
| 2780 // the bytecodes out from under any threads executing the old | |
| 2781 // method and make the thread's bcp invalid. Since EMCP requires | |
| 2782 // that the bytecodes be the same modulo constant pool indices, it | |
| 2783 // is straight forward to compute the correct new bcp in the new | |
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2784 // ConstMethod* from the old bcp in the old ConstMethod*. The |
| 0 | 2785 // time consuming part would be searching all the frames in all |
| 2786 // of the threads to find all of the calls to the old method. | |
| 2787 // | |
| 2788 // It looks like we will have to live with the limited savings | |
| 2789 // that we get from effectively overwriting the old methods | |
| 2790 // when the new methods are attached to the_class. | |
| 2791 | |
| 2792 // track which methods are EMCP for add_previous_version() call | |
| 2793 emcp_methods->set_bit(old_index); | |
| 2794 (*emcp_method_count_p)++; | |
| 2795 | |
| 2796 // An EMCP method is _not_ obsolete. An obsolete method has a | |
| 2797 // different jmethodID than the current method. An EMCP method | |
| 2798 // has the same jmethodID as the current method. Having the | |
| 2799 // same jmethodID for all EMCP versions of a method allows for | |
| 2800 // a consistent view of the EMCP methods regardless of which | |
| 2801 // EMCP method you happen to have in hand. For example, a | |
| 2802 // breakpoint set in one EMCP method will work for all EMCP | |
| 2803 // versions of the method including the current one. | |
| 2804 } else { | |
| 2805 // mark obsolete methods as such | |
| 2806 old_method->set_is_obsolete(); | |
| 2807 obsolete_count++; | |
| 2808 | |
| 2809 // obsolete methods need a unique idnum | |
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2810 u2 num = InstanceKlass::cast(_the_class_oop)->next_method_idnum(); |
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2811 if (num != ConstMethod::UNSET_IDNUM) { |
| 0 | 2812 // u2 old_num = old_method->method_idnum(); |
| 2813 old_method->set_method_idnum(num); | |
| 2814 // TO DO: attach obsolete annotations to obsolete method's new idnum | |
| 2815 } | |
| 2816 // With tracing we try not to "yack" too much. The position of | |
| 2817 // this trace assumes there are fewer obsolete methods than | |
| 2818 // EMCP methods. | |
| 2819 RC_TRACE(0x00000100, ("mark %s(%s) as obsolete", | |
| 2820 old_method->name()->as_C_string(), | |
| 2821 old_method->signature()->as_C_string())); | |
| 2822 } | |
| 2823 old_method->set_is_old(); | |
| 2824 } | |
| 2825 for (int i = 0; i < _deleted_methods_length; ++i) { | |
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2826 Method* old_method = _deleted_methods[i]; |
| 0 | 2827 |
| 2828 assert(old_method->vtable_index() < 0, | |
| 2829 "cannot delete methods with vtable entries");; | |
| 2830 | |
| 2831 // Mark all deleted methods as old and obsolete | |
| 2832 old_method->set_is_old(); | |
| 2833 old_method->set_is_obsolete(); | |
| 2834 ++obsolete_count; | |
| 2835 // With tracing we try not to "yack" too much. The position of | |
| 2836 // this trace assumes there are fewer obsolete methods than | |
| 2837 // EMCP methods. | |
| 2838 RC_TRACE(0x00000100, ("mark deleted %s(%s) as obsolete", | |
| 2839 old_method->name()->as_C_string(), | |
| 2840 old_method->signature()->as_C_string())); | |
| 2841 } | |
| 2842 assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(), | |
| 2843 "sanity check"); | |
| 2844 RC_TRACE(0x00000100, ("EMCP_cnt=%d, obsolete_cnt=%d", *emcp_method_count_p, | |
| 2845 obsolete_count)); | |
| 2846 } | |
| 2847 | |
| 2848 // This internal class transfers the native function registration from old methods | |
| 2849 // to new methods. It is designed to handle both the simple case of unchanged | |
| 2850 // native methods and the complex cases of native method prefixes being added and/or | |
| 2851 // removed. | |
| 2852 // It expects only to be used during the VM_RedefineClasses op (a safepoint). | |
| 2853 // | |
| 2854 // This class is used after the new methods have been installed in "the_class". | |
| 2855 // | |
| 2856 // So, for example, the following must be handled. Where 'm' is a method and | |
| 2857 // a number followed by an underscore is a prefix. | |
| 2858 // | |
| 2859 // Old Name New Name | |
| 2860 // Simple transfer to new method m -> m | |
| 2861 // Add prefix m -> 1_m | |
| 2862 // Remove prefix 1_m -> m | |
| 2863 // Simultaneous add of prefixes m -> 3_2_1_m | |
| 2864 // Simultaneous removal of prefixes 3_2_1_m -> m | |
| 2865 // Simultaneous add and remove 1_m -> 2_m | |
| 2866 // Same, caused by prefix removal only 3_2_1_m -> 3_2_m | |
| 2867 // | |
| 2868 class TransferNativeFunctionRegistration { | |
| 2869 private: | |
| 2870 instanceKlassHandle the_class; | |
| 2871 int prefix_count; | |
| 2872 char** prefixes; | |
| 2873 | |
| 2874 // Recursively search the binary tree of possibly prefixed method names. | |
| 2875 // Iteration could be used if all agents were well behaved. Full tree walk is | |
| 2876 // more resilent to agents not cleaning up intermediate methods. | |
| 2877 // Branch at each depth in the binary tree is: | |
| 2878 // (1) without the prefix. | |
| 2879 // (2) with the prefix. | |
| 2880 // where 'prefix' is the prefix at that 'depth' (first prefix, second prefix,...) | |
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2881 Method* search_prefix_name_space(int depth, char* name_str, size_t name_len, |
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2882 Symbol* signature) { |
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2883 TempNewSymbol name_symbol = SymbolTable::probe(name_str, (int)name_len); |
| 0 | 2884 if (name_symbol != NULL) { |
| 6983 | 2885 Method* method = the_class()->lookup_method(name_symbol, signature); |
| 0 | 2886 if (method != NULL) { |
| 2887 // Even if prefixed, intermediate methods must exist. | |
| 2888 if (method->is_native()) { | |
| 2889 // Wahoo, we found a (possibly prefixed) version of the method, return it. | |
| 2890 return method; | |
| 2891 } | |
| 2892 if (depth < prefix_count) { | |
| 2893 // Try applying further prefixes (other than this one). | |
| 2894 method = search_prefix_name_space(depth+1, name_str, name_len, signature); | |
| 2895 if (method != NULL) { | |
| 2896 return method; // found | |
| 2897 } | |
| 2898 | |
| 2899 // Try adding this prefix to the method name and see if it matches | |
| 2900 // another method name. | |
| 2901 char* prefix = prefixes[depth]; | |
| 2902 size_t prefix_len = strlen(prefix); | |
| 2903 size_t trial_len = name_len + prefix_len; | |
| 2904 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); | |
| 2905 strcpy(trial_name_str, prefix); | |
| 2906 strcat(trial_name_str, name_str); | |
| 2907 method = search_prefix_name_space(depth+1, trial_name_str, trial_len, | |
| 2908 signature); | |
| 2909 if (method != NULL) { | |
| 2910 // If found along this branch, it was prefixed, mark as such | |
| 2911 method->set_is_prefixed_native(); | |
| 2912 return method; // found | |
| 2913 } | |
| 2914 } | |
| 2915 } | |
| 2916 } | |
| 2917 return NULL; // This whole branch bore nothing | |
| 2918 } | |
| 2919 | |
| 2920 // Return the method name with old prefixes stripped away. | |
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2921 char* method_name_without_prefixes(Method* method) { |
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2922 Symbol* name = method->name(); |
| 0 | 2923 char* name_str = name->as_utf8(); |
| 2924 | |
| 2925 // Old prefixing may be defunct, strip prefixes, if any. | |
| 2926 for (int i = prefix_count-1; i >= 0; i--) { | |
| 2927 char* prefix = prefixes[i]; | |
| 2928 size_t prefix_len = strlen(prefix); | |
| 2929 if (strncmp(prefix, name_str, prefix_len) == 0) { | |
| 2930 name_str += prefix_len; | |
| 2931 } | |
| 2932 } | |
| 2933 return name_str; | |
| 2934 } | |
| 2935 | |
| 2936 // Strip any prefixes off the old native method, then try to find a | |
| 2937 // (possibly prefixed) new native that matches it. | |
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2938 Method* strip_and_search_for_new_native(Method* method) { |
| 0 | 2939 ResourceMark rm; |
| 2940 char* name_str = method_name_without_prefixes(method); | |
| 2941 return search_prefix_name_space(0, name_str, strlen(name_str), | |
| 2942 method->signature()); | |
| 2943 } | |
| 2944 | |
| 2945 public: | |
| 2946 | |
| 2947 // Construct a native method transfer processor for this class. | |
| 2948 TransferNativeFunctionRegistration(instanceKlassHandle _the_class) { | |
| 2949 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
| 2950 | |
| 2951 the_class = _the_class; | |
| 2952 prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); | |
| 2953 } | |
| 2954 | |
| 2955 // Attempt to transfer any of the old or deleted methods that are native | |
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2956 void transfer_registrations(Method** old_methods, int methods_length) { |
| 0 | 2957 for (int j = 0; j < methods_length; j++) { |
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2958 Method* old_method = old_methods[j]; |
| 0 | 2959 |
| 2960 if (old_method->is_native() && old_method->has_native_function()) { | |
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2961 Method* new_method = strip_and_search_for_new_native(old_method); |
| 0 | 2962 if (new_method != NULL) { |
| 2963 // Actually set the native function in the new method. | |
| 2964 // Redefine does not send events (except CFLH), certainly not this | |
| 2965 // behind the scenes re-registration. | |
| 2966 new_method->set_native_function(old_method->native_function(), | |
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2967 !Method::native_bind_event_is_interesting); |
| 0 | 2968 } |
| 2969 } | |
| 2970 } | |
| 2971 } | |
| 2972 }; | |
| 2973 | |
| 2974 // Don't lose the association between a native method and its JNI function. | |
| 2975 void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle the_class) { | |
| 2976 TransferNativeFunctionRegistration transfer(the_class); | |
| 2977 transfer.transfer_registrations(_deleted_methods, _deleted_methods_length); | |
| 2978 transfer.transfer_registrations(_matching_old_methods, _matching_methods_length); | |
| 2979 } | |
| 2980 | |
| 2981 // Deoptimize all compiled code that depends on this class. | |
| 2982 // | |
| 2983 // If the can_redefine_classes capability is obtained in the onload | |
| 2984 // phase then the compiler has recorded all dependencies from startup. | |
| 2985 // In that case we need only deoptimize and throw away all compiled code | |
| 2986 // that depends on the class. | |
| 2987 // | |
| 2988 // If can_redefine_classes is obtained sometime after the onload | |
| 2989 // phase then the dependency information may be incomplete. In that case | |
| 2990 // the first call to RedefineClasses causes all compiled code to be | |
| 2991 // thrown away. As can_redefine_classes has been obtained then | |
| 2992 // all future compilations will record dependencies so second and | |
| 2993 // subsequent calls to RedefineClasses need only throw away code | |
| 2994 // that depends on the class. | |
| 2995 // | |
| 2996 void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) { | |
| 2997 assert_locked_or_safepoint(Compile_lock); | |
| 2998 | |
| 2999 // All dependencies have been recorded from startup or this is a second or | |
| 3000 // subsequent use of RedefineClasses | |
| 3001 if (JvmtiExport::all_dependencies_are_recorded()) { | |
| 3002 Universe::flush_evol_dependents_on(k_h); | |
| 3003 } else { | |
| 3004 CodeCache::mark_all_nmethods_for_deoptimization(); | |
| 3005 | |
| 3006 ResourceMark rm(THREAD); | |
| 3007 DeoptimizationMarker dm; | |
| 3008 | |
| 3009 // Deoptimize all activations depending on marked nmethods | |
| 3010 Deoptimization::deoptimize_dependents(); | |
| 3011 | |
| 3012 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 3013 CodeCache::make_marked_nmethods_not_entrant(); | |
| 3014 | |
| 3015 // From now on we know that the dependency information is complete | |
| 3016 JvmtiExport::set_all_dependencies_are_recorded(true); | |
| 3017 } | |
| 3018 } | |
| 3019 | |
| 3020 void VM_RedefineClasses::compute_added_deleted_matching_methods() { | |
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3021 Method* old_method; |
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3022 Method* new_method; |
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3023 |
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3024 _matching_old_methods = NEW_RESOURCE_ARRAY(Method*, _old_methods->length()); |
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3025 _matching_new_methods = NEW_RESOURCE_ARRAY(Method*, _old_methods->length()); |
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3026 _added_methods = NEW_RESOURCE_ARRAY(Method*, _new_methods->length()); |
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3027 _deleted_methods = NEW_RESOURCE_ARRAY(Method*, _old_methods->length()); |
| 0 | 3028 |
| 3029 _matching_methods_length = 0; | |
| 3030 _deleted_methods_length = 0; | |
| 3031 _added_methods_length = 0; | |
| 3032 | |
| 3033 int nj = 0; | |
| 3034 int oj = 0; | |
| 3035 while (true) { | |
| 3036 if (oj >= _old_methods->length()) { | |
| 3037 if (nj >= _new_methods->length()) { | |
| 3038 break; // we've looked at everything, done | |
| 3039 } | |
| 3040 // New method at the end | |
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3041 new_method = _new_methods->at(nj); |
| 0 | 3042 _added_methods[_added_methods_length++] = new_method; |
| 3043 ++nj; | |
| 3044 } else if (nj >= _new_methods->length()) { | |
| 3045 // Old method, at the end, is deleted | |
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3046 old_method = _old_methods->at(oj); |
| 0 | 3047 _deleted_methods[_deleted_methods_length++] = old_method; |
| 3048 ++oj; | |
| 3049 } else { | |
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3050 old_method = _old_methods->at(oj); |
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3051 new_method = _new_methods->at(nj); |
| 0 | 3052 if (old_method->name() == new_method->name()) { |
| 3053 if (old_method->signature() == new_method->signature()) { | |
| 3054 _matching_old_methods[_matching_methods_length ] = old_method; | |
| 3055 _matching_new_methods[_matching_methods_length++] = new_method; | |
| 3056 ++nj; | |
| 3057 ++oj; | |
| 3058 } else { | |
| 3059 // added overloaded have already been moved to the end, | |
| 3060 // so this is a deleted overloaded method | |
| 3061 _deleted_methods[_deleted_methods_length++] = old_method; | |
| 3062 ++oj; | |
| 3063 } | |
| 3064 } else { // names don't match | |
| 3065 if (old_method->name()->fast_compare(new_method->name()) > 0) { | |
| 3066 // new method | |
| 3067 _added_methods[_added_methods_length++] = new_method; | |
| 3068 ++nj; | |
| 3069 } else { | |
| 3070 // deleted method | |
| 3071 _deleted_methods[_deleted_methods_length++] = old_method; | |
| 3072 ++oj; | |
| 3073 } | |
| 3074 } | |
| 3075 } | |
| 3076 } | |
| 3077 assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity"); | |
| 3078 assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity"); | |
| 3079 } | |
| 3080 | |
| 3081 | |
| 3082 | |
| 3083 // Install the redefinition of a class: | |
| 3084 // - house keeping (flushing breakpoints and caches, deoptimizing | |
| 3085 // dependent compiled code) | |
| 3086 // - replacing parts in the_class with parts from scratch_class | |
| 3087 // - adding a weak reference to track the obsolete but interesting | |
| 3088 // parts of the_class | |
| 3089 // - adjusting constant pool caches and vtables in other classes | |
| 3090 // that refer to methods in the_class. These adjustments use the | |
| 3091 // SystemDictionary::classes_do() facility which only allows | |
| 3092 // a helper method to be specified. The interesting parameters | |
| 3093 // that we would like to pass to the helper method are saved in | |
| 3094 // static global fields in the VM operation. | |
| 3095 void VM_RedefineClasses::redefine_single_class(jclass the_jclass, | |
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3096 Klass* scratch_class_oop, TRAPS) { |
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3097 |
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3098 HandleMark hm(THREAD); // make sure handles from this call are freed |
| 0 | 3099 RC_TIMER_START(_timer_rsc_phase1); |
| 3100 | |
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3101 instanceKlassHandle scratch_class(scratch_class_oop); |
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3102 |
| 0 | 3103 oop the_class_mirror = JNIHandles::resolve_non_null(the_jclass); |
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3104 Klass* the_class_oop = java_lang_Class::as_Klass(the_class_mirror); |
| 0 | 3105 instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop); |
| 3106 | |
| 3107 // Remove all breakpoints in methods of this class | |
| 3108 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); | |
| 3109 jvmti_breakpoints.clearall_in_class_at_safepoint(the_class_oop); | |
| 3110 | |
| 3111 if (the_class_oop == Universe::reflect_invoke_cache()->klass()) { | |
| 3112 // We are redefining java.lang.reflect.Method. Method.invoke() is | |
| 3113 // cached and users of the cache care about each active version of | |
| 3114 // the method so we have to track this previous version. | |
| 3115 // Do this before methods get switched | |
| 3116 Universe::reflect_invoke_cache()->add_previous_version( | |
| 3117 the_class->method_with_idnum(Universe::reflect_invoke_cache()->method_idnum())); | |
| 3118 } | |
| 3119 | |
| 3120 // Deoptimize all compiled code that depends on this class | |
| 3121 flush_dependent_code(the_class, THREAD); | |
| 3122 | |
| 3123 _old_methods = the_class->methods(); | |
| 3124 _new_methods = scratch_class->methods(); | |
| 3125 _the_class_oop = the_class_oop; | |
| 3126 compute_added_deleted_matching_methods(); | |
| 3127 update_jmethod_ids(); | |
| 3128 | |
| 3129 // Attach new constant pool to the original klass. The original | |
| 3130 // klass still refers to the old constant pool (for now). | |
| 3131 scratch_class->constants()->set_pool_holder(the_class()); | |
| 3132 | |
| 3133 #if 0 | |
| 3134 // In theory, with constant pool merging in place we should be able | |
| 3135 // to save space by using the new, merged constant pool in place of | |
| 3136 // the old constant pool(s). By "pool(s)" I mean the constant pool in | |
| 3137 // the klass version we are replacing now and any constant pool(s) in | |
| 3138 // previous versions of klass. Nice theory, doesn't work in practice. | |
| 3139 // When this code is enabled, even simple programs throw NullPointer | |
| 3140 // exceptions. I'm guessing that this is caused by some constant pool | |
| 3141 // cache difference between the new, merged constant pool and the | |
| 3142 // constant pool that was just being used by the klass. I'm keeping | |
| 3143 // this code around to archive the idea, but the code has to remain | |
| 3144 // disabled for now. | |
| 3145 | |
| 3146 // Attach each old method to the new constant pool. This can be | |
| 3147 // done here since we are past the bytecode verification and | |
| 3148 // constant pool optimization phases. | |
| 3149 for (int i = _old_methods->length() - 1; i >= 0; i--) { | |
|
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3150 Method* method = _old_methods->at(i); |
| 0 | 3151 method->set_constants(scratch_class->constants()); |
| 3152 } | |
| 3153 | |
| 3154 { | |
| 3155 // walk all previous versions of the klass | |
|
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3156 InstanceKlass *ik = (InstanceKlass *)the_class(); |
| 0 | 3157 PreviousVersionWalker pvw(ik); |
| 3158 instanceKlassHandle ikh; | |
| 3159 do { | |
| 3160 ikh = pvw.next_previous_version(); | |
| 3161 if (!ikh.is_null()) { | |
| 3162 ik = ikh(); | |
| 3163 | |
| 3164 // attach previous version of klass to the new constant pool | |
| 3165 ik->set_constants(scratch_class->constants()); | |
| 3166 | |
| 3167 // Attach each method in the previous version of klass to the | |
| 3168 // new constant pool | |
|
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3169 Array<Method*>* prev_methods = ik->methods(); |
| 0 | 3170 for (int i = prev_methods->length() - 1; i >= 0; i--) { |
|
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3171 Method* method = prev_methods->at(i); |
| 0 | 3172 method->set_constants(scratch_class->constants()); |
| 3173 } | |
| 3174 } | |
| 3175 } while (!ikh.is_null()); | |
| 3176 } | |
| 3177 #endif | |
| 3178 | |
| 3179 // Replace methods and constantpool | |
| 3180 the_class->set_methods(_new_methods); | |
| 3181 scratch_class->set_methods(_old_methods); // To prevent potential GCing of the old methods, | |
| 3182 // and to be able to undo operation easily. | |
| 3183 | |
|
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3184 ConstantPool* old_constants = the_class->constants(); |
| 0 | 3185 the_class->set_constants(scratch_class->constants()); |
| 3186 scratch_class->set_constants(old_constants); // See the previous comment. | |
| 3187 #if 0 | |
| 3188 // We are swapping the guts of "the new class" with the guts of "the | |
| 3189 // class". Since the old constant pool has just been attached to "the | |
| 3190 // new class", it seems logical to set the pool holder in the old | |
| 3191 // constant pool also. However, doing this will change the observable | |
| 3192 // class hierarchy for any old methods that are still executing. A | |
| 3193 // method can query the identity of its "holder" and this query uses | |
| 3194 // the method's constant pool link to find the holder. The change in | |
| 3195 // holding class from "the class" to "the new class" can confuse | |
| 3196 // things. | |
| 3197 // | |
| 3198 // Setting the old constant pool's holder will also cause | |
| 3199 // verification done during vtable initialization below to fail. | |
| 3200 // During vtable initialization, the vtable's class is verified to be | |
| 3201 // a subtype of the method's holder. The vtable's class is "the | |
| 3202 // class" and the method's holder is gotten from the constant pool | |
| 3203 // link in the method itself. For "the class"'s directly implemented | |
| 3204 // methods, the method holder is "the class" itself (as gotten from | |
| 3205 // the new constant pool). The check works fine in this case. The | |
| 3206 // check also works fine for methods inherited from super classes. | |
| 3207 // | |
| 3208 // Miranda methods are a little more complicated. A miranda method is | |
| 3209 // provided by an interface when the class implementing the interface | |
| 3210 // does not provide its own method. These interfaces are implemented | |
|
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3211 // internally as an InstanceKlass. These special instanceKlasses |
| 0 | 3212 // share the constant pool of the class that "implements" the |
| 3213 // interface. By sharing the constant pool, the method holder of a | |
| 3214 // miranda method is the class that "implements" the interface. In a | |
| 3215 // non-redefine situation, the subtype check works fine. However, if | |
| 3216 // the old constant pool's pool holder is modified, then the check | |
| 3217 // fails because there is no class hierarchy relationship between the | |
| 3218 // vtable's class and "the new class". | |
| 3219 | |
| 3220 old_constants->set_pool_holder(scratch_class()); | |
| 3221 #endif | |
| 3222 | |
| 3223 // track which methods are EMCP for add_previous_version() call below | |
| 3224 BitMap emcp_methods(_old_methods->length()); | |
| 3225 int emcp_method_count = 0; | |
| 3226 emcp_methods.clear(); // clears 0..(length() - 1) | |
| 3227 check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count); | |
| 3228 transfer_old_native_function_registrations(the_class); | |
| 3229 | |
| 3230 // The class file bytes from before any retransformable agents mucked | |
| 3231 // with them was cached on the scratch class, move to the_class. | |
| 3232 // Note: we still want to do this if nothing needed caching since it | |
| 3233 // should get cleared in the_class too. | |
|
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|
3234 if (the_class->get_cached_class_file_bytes() == 0) { |
|
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|
3235 // the_class doesn't have a cache yet so copy it |
|
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|
3236 the_class->set_cached_class_file( |
|
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|
3237 scratch_class->get_cached_class_file_bytes(), |
|
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|
3238 scratch_class->get_cached_class_file_len()); |
|
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|
3239 } |
|
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|
3240 #ifndef PRODUCT |
|
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|
3241 else { |
|
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|
3242 assert(the_class->get_cached_class_file_bytes() == |
|
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|
3243 scratch_class->get_cached_class_file_bytes(), "cache ptrs must match"); |
|
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|
3244 assert(the_class->get_cached_class_file_len() == |
|
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|
3245 scratch_class->get_cached_class_file_len(), "cache lens must match"); |
|
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|
3246 } |
|
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|
3247 #endif |
| 0 | 3248 |
| 3249 // Replace inner_classes | |
|
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3250 Array<u2>* old_inner_classes = the_class->inner_classes(); |
| 0 | 3251 the_class->set_inner_classes(scratch_class->inner_classes()); |
| 3252 scratch_class->set_inner_classes(old_inner_classes); | |
| 3253 | |
| 3254 // Initialize the vtable and interface table after | |
| 3255 // methods have been rewritten | |
| 3256 { | |
| 3257 ResourceMark rm(THREAD); | |
| 3258 // no exception should happen here since we explicitly | |
| 3259 // do not check loader constraints. | |
| 3260 // compare_and_normalize_class_versions has already checked: | |
| 3261 // - classloaders unchanged, signatures unchanged | |
| 3262 // - all instanceKlasses for redefined classes reused & contents updated | |
| 3263 the_class->vtable()->initialize_vtable(false, THREAD); | |
| 3264 the_class->itable()->initialize_itable(false, THREAD); | |
| 1142 | 3265 assert(!HAS_PENDING_EXCEPTION || (THREAD->pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())), "redefine exception"); |
| 0 | 3266 } |
| 3267 | |
| 3268 // Leave arrays of jmethodIDs and itable index cache unchanged | |
| 3269 | |
| 3270 // Copy the "source file name" attribute from new class version | |
| 3271 the_class->set_source_file_name(scratch_class->source_file_name()); | |
| 3272 | |
| 3273 // Copy the "source debug extension" attribute from new class version | |
| 3274 the_class->set_source_debug_extension( | |
|
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|
3275 scratch_class->source_debug_extension(), |
|
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|
3276 scratch_class->source_debug_extension() == NULL ? 0 : |
|
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|
3277 (int)strlen(scratch_class->source_debug_extension())); |
| 0 | 3278 |
| 3279 // Use of javac -g could be different in the old and the new | |
| 3280 if (scratch_class->access_flags().has_localvariable_table() != | |
| 3281 the_class->access_flags().has_localvariable_table()) { | |
| 3282 | |
| 3283 AccessFlags flags = the_class->access_flags(); | |
| 3284 if (scratch_class->access_flags().has_localvariable_table()) { | |
| 3285 flags.set_has_localvariable_table(); | |
| 3286 } else { | |
| 3287 flags.clear_has_localvariable_table(); | |
| 3288 } | |
| 3289 the_class->set_access_flags(flags); | |
| 3290 } | |
| 3291 | |
|
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|
3292 // Since there is currently no rewriting of type annotations indexes |
|
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|
3293 // into the CP, we null out type annotations on scratch_class before |
|
35431a769282
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|
3294 // we swap annotations with the_class rather than facing the |
|
35431a769282
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|
3295 // possibility of shipping annotations with broken indexes to |
|
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|
3296 // Java-land. |
|
35431a769282
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|
3297 Annotations* new_annotations = scratch_class->annotations(); |
|
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|
3298 if (new_annotations != NULL) { |
|
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|
3299 Annotations* new_type_annotations = new_annotations->type_annotations(); |
|
35431a769282
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|
3300 if (new_type_annotations != NULL) { |
|
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|
3301 MetadataFactory::free_metadata(scratch_class->class_loader_data(), new_type_annotations); |
|
35431a769282
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|
3302 new_annotations->set_type_annotations(NULL); |
|
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|
3303 } |
|
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|
3304 } |
|
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|
3305 // Swap annotation fields values |
|
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|
3306 Annotations* old_annotations = the_class->annotations(); |
|
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|
3307 the_class->set_annotations(scratch_class->annotations()); |
|
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|
3308 scratch_class->set_annotations(old_annotations); |
| 0 | 3309 |
| 3310 // Replace minor version number of class file | |
| 3311 u2 old_minor_version = the_class->minor_version(); | |
| 3312 the_class->set_minor_version(scratch_class->minor_version()); | |
| 3313 scratch_class->set_minor_version(old_minor_version); | |
| 3314 | |
| 3315 // Replace major version number of class file | |
| 3316 u2 old_major_version = the_class->major_version(); | |
| 3317 the_class->set_major_version(scratch_class->major_version()); | |
| 3318 scratch_class->set_major_version(old_major_version); | |
| 3319 | |
| 3320 // Replace CP indexes for class and name+type of enclosing method | |
| 3321 u2 old_class_idx = the_class->enclosing_method_class_index(); | |
| 3322 u2 old_method_idx = the_class->enclosing_method_method_index(); | |
| 3323 the_class->set_enclosing_method_indices( | |
| 3324 scratch_class->enclosing_method_class_index(), | |
| 3325 scratch_class->enclosing_method_method_index()); | |
| 3326 scratch_class->set_enclosing_method_indices(old_class_idx, old_method_idx); | |
| 3327 | |
| 3328 // keep track of previous versions of this class | |
| 3329 the_class->add_previous_version(scratch_class, &emcp_methods, | |
| 3330 emcp_method_count); | |
| 3331 | |
| 3332 RC_TIMER_STOP(_timer_rsc_phase1); | |
| 3333 RC_TIMER_START(_timer_rsc_phase2); | |
| 3334 | |
| 3335 // Adjust constantpool caches and vtables for all classes | |
| 3336 // that reference methods of the evolved class. | |
| 3337 SystemDictionary::classes_do(adjust_cpool_cache_and_vtable, THREAD); | |
| 3338 | |
|
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|
3339 // Fix Resolution Error table also to remove old constant pools |
|
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|
3340 SystemDictionary::delete_resolution_error(old_constants); |
|
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|
3341 |
| 0 | 3342 if (the_class->oop_map_cache() != NULL) { |
| 3343 // Flush references to any obsolete methods from the oop map cache | |
| 3344 // so that obsolete methods are not pinned. | |
| 3345 the_class->oop_map_cache()->flush_obsolete_entries(); | |
| 3346 } | |
| 3347 | |
| 3348 // increment the classRedefinedCount field in the_class and in any | |
| 3349 // direct and indirect subclasses of the_class | |
|
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|
3350 increment_class_counter((InstanceKlass *)the_class(), THREAD); |
| 0 | 3351 |
| 3352 // RC_TRACE macro has an embedded ResourceMark | |
| 3353 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
| 3354 ("redefined name=%s, count=%d (avail_mem=" UINT64_FORMAT "K)", | |
| 3355 the_class->external_name(), | |
| 3356 java_lang_Class::classRedefinedCount(the_class_mirror), | |
| 3357 os::available_memory() >> 10)); | |
| 3358 | |
| 3359 RC_TIMER_STOP(_timer_rsc_phase2); | |
| 3360 } // end redefine_single_class() | |
| 3361 | |
| 3362 | |
|
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|
3363 // Increment the classRedefinedCount field in the specific InstanceKlass |
| 0 | 3364 // and in all direct and indirect subclasses. |
|
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|
3365 void VM_RedefineClasses::increment_class_counter(InstanceKlass *ik, TRAPS) { |
| 0 | 3366 oop class_mirror = ik->java_mirror(); |
|
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|
3367 Klass* class_oop = java_lang_Class::as_Klass(class_mirror); |
| 0 | 3368 int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1; |
| 3369 java_lang_Class::set_classRedefinedCount(class_mirror, new_count); | |
| 3370 | |
| 3371 if (class_oop != _the_class_oop) { | |
| 3372 // _the_class_oop count is printed at end of redefine_single_class() | |
| 3373 RC_TRACE_WITH_THREAD(0x00000008, THREAD, | |
| 3374 ("updated count in subclass=%s to %d", ik->external_name(), new_count)); | |
| 3375 } | |
| 3376 | |
| 3377 for (Klass *subk = ik->subklass(); subk != NULL; | |
| 3378 subk = subk->next_sibling()) { | |
|
2377
57552dca1708
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parents:
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diff
changeset
|
3379 if (subk->oop_is_instance()) { |
|
57552dca1708
7029509: nightly failures after static fields in Class
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parents:
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diff
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|
3380 // Only update instanceKlasses |
|
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|
3381 InstanceKlass *subik = (InstanceKlass*)subk; |
|
2377
57552dca1708
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parents:
2332
diff
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|
3382 // recursively do subclasses of the current subclass |
|
57552dca1708
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parents:
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diff
changeset
|
3383 increment_class_counter(subik, THREAD); |
|
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diff
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|
3384 } |
| 0 | 3385 } |
| 3386 } | |
| 3387 | |
| 3388 #ifndef PRODUCT | |
|
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|
3389 void VM_RedefineClasses::check_class(Klass* k_oop, |
|
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|
3390 ClassLoaderData* initiating_loader, |
|
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|
3391 TRAPS) { |
|
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|
3392 Klass *k = k_oop; |
| 0 | 3393 if (k->oop_is_instance()) { |
| 3394 HandleMark hm(THREAD); | |
|
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|
3395 InstanceKlass *ik = (InstanceKlass *) k; |
| 0 | 3396 |
| 3397 if (ik->vtable_length() > 0) { | |
| 3398 ResourceMark rm(THREAD); | |
| 3399 if (!ik->vtable()->check_no_old_entries()) { | |
| 3400 tty->print_cr("klassVtable::check_no_old_entries failure -- OLD method found -- class: %s", ik->signature_name()); | |
| 3401 ik->vtable()->dump_vtable(); | |
| 3402 assert(false, "OLD method found"); | |
| 3403 } | |
| 3404 } | |
|
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|
3405 if (ik->itable_length() > 0) { |
|
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|
3406 ResourceMark rm(THREAD); |
|
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|
3407 if (!ik->itable()->check_no_old_entries()) { |
|
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|
3408 tty->print_cr("klassItable::check_no_old_entries failure -- OLD method found -- class: %s", ik->signature_name()); |
|
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3409 assert(false, "OLD method found"); |
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3410 } |
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3411 } |
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3412 // Check that the constant pool cache has no deleted entries. |
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3413 if (ik->constants() != NULL && |
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3414 ik->constants()->cache() != NULL && |
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3415 !ik->constants()->cache()->check_no_old_entries()) { |
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3416 tty->print_cr("klassVtable::check_no_old_entries failure -- OLD method found -- class: %s", ik->signature_name()); |
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3417 assert(false, "OLD method found"); |
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3418 } |
| 0 | 3419 } |
| 3420 } | |
| 3421 | |
| 3422 void VM_RedefineClasses::dump_methods() { | |
| 3423 int j; | |
| 3424 tty->print_cr("_old_methods --"); | |
| 3425 for (j = 0; j < _old_methods->length(); ++j) { | |
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3426 Method* m = _old_methods->at(j); |
| 0 | 3427 tty->print("%4d (%5d) ", j, m->vtable_index()); |
| 3428 m->access_flags().print_on(tty); | |
| 3429 tty->print(" -- "); | |
| 3430 m->print_name(tty); | |
| 3431 tty->cr(); | |
| 3432 } | |
| 3433 tty->print_cr("_new_methods --"); | |
| 3434 for (j = 0; j < _new_methods->length(); ++j) { | |
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3435 Method* m = _new_methods->at(j); |
| 0 | 3436 tty->print("%4d (%5d) ", j, m->vtable_index()); |
| 3437 m->access_flags().print_on(tty); | |
| 3438 tty->print(" -- "); | |
| 3439 m->print_name(tty); | |
| 3440 tty->cr(); | |
| 3441 } | |
| 3442 tty->print_cr("_matching_(old/new)_methods --"); | |
| 3443 for (j = 0; j < _matching_methods_length; ++j) { | |
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3444 Method* m = _matching_old_methods[j]; |
| 0 | 3445 tty->print("%4d (%5d) ", j, m->vtable_index()); |
| 3446 m->access_flags().print_on(tty); | |
| 3447 tty->print(" -- "); | |
| 3448 m->print_name(tty); | |
| 3449 tty->cr(); | |
| 3450 m = _matching_new_methods[j]; | |
| 3451 tty->print(" (%5d) ", m->vtable_index()); | |
| 3452 m->access_flags().print_on(tty); | |
| 3453 tty->cr(); | |
| 3454 } | |
| 3455 tty->print_cr("_deleted_methods --"); | |
| 3456 for (j = 0; j < _deleted_methods_length; ++j) { | |
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3457 Method* m = _deleted_methods[j]; |
| 0 | 3458 tty->print("%4d (%5d) ", j, m->vtable_index()); |
| 3459 m->access_flags().print_on(tty); | |
| 3460 tty->print(" -- "); | |
| 3461 m->print_name(tty); | |
| 3462 tty->cr(); | |
| 3463 } | |
| 3464 tty->print_cr("_added_methods --"); | |
| 3465 for (j = 0; j < _added_methods_length; ++j) { | |
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3466 Method* m = _added_methods[j]; |
| 0 | 3467 tty->print("%4d (%5d) ", j, m->vtable_index()); |
| 3468 m->access_flags().print_on(tty); | |
| 3469 tty->print(" -- "); | |
| 3470 m->print_name(tty); | |
| 3471 tty->cr(); | |
| 3472 } | |
| 3473 } | |
| 3474 #endif |