Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiRedefineClasses.cpp @ 15177:66e3af78ea96
HSAIL: added safepoint support
Contributed-by: Eric Caspole <eric.caspole@amd.com>
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 17 Apr 2014 00:44:32 +0200 |
parents | ee5727365ce5 |
children | 89152779163c 78bbf4d43a14 |
rev | line source |
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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 |
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150 // Disable any dependent concurrent compilations |
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151 SystemDictionary::notice_modification(); |
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152 |
0 | 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 | |
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157 // check_class() is optionally called for product bits, but is |
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158 // always called for non-product bits. |
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159 #ifdef PRODUCT |
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160 if (RC_TRACE_ENABLED(0x00004000)) { |
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161 #endif |
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162 RC_TRACE_WITH_THREAD(0x00004000, thread, ("calling check_class")); |
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163 CheckClass check_class(thread); |
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164 ClassLoaderDataGraph::classes_do(&check_class); |
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165 #ifdef PRODUCT |
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166 } |
0 | 167 #endif |
168 } | |
169 | |
170 void VM_RedefineClasses::doit_epilogue() { | |
171 // Free os::malloc allocated memory. | |
172 os::free(_scratch_classes); | |
173 | |
174 if (RC_TRACE_ENABLED(0x00000004)) { | |
175 // Used to have separate timers for "doit" and "all", but the timer | |
176 // overhead skewed the measurements. | |
177 jlong doit_time = _timer_rsc_phase1.milliseconds() + | |
178 _timer_rsc_phase2.milliseconds(); | |
179 jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time; | |
180 | |
181 RC_TRACE(0x00000004, ("vm_op: all=" UINT64_FORMAT | |
182 " prologue=" UINT64_FORMAT " doit=" UINT64_FORMAT, all_time, | |
183 _timer_vm_op_prologue.milliseconds(), doit_time)); | |
184 RC_TRACE(0x00000004, | |
185 ("redefine_single_class: phase1=" UINT64_FORMAT " phase2=" UINT64_FORMAT, | |
186 _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds())); | |
187 } | |
188 } | |
189 | |
190 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) { | |
191 // classes for primitives cannot be redefined | |
192 if (java_lang_Class::is_primitive(klass_mirror)) { | |
193 return false; | |
194 } | |
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195 Klass* the_class_oop = java_lang_Class::as_Klass(klass_mirror); |
0 | 196 // classes for arrays cannot be redefined |
6983 | 197 if (the_class_oop == NULL || !the_class_oop->oop_is_instance()) { |
0 | 198 return false; |
199 } | |
200 return true; | |
201 } | |
202 | |
203 // Append the current entry at scratch_i in scratch_cp to *merge_cp_p | |
204 // where the end of *merge_cp_p is specified by *merge_cp_length_p. For | |
205 // direct CP entries, there is just the current entry to append. For | |
206 // indirect and double-indirect CP entries, there are zero or more | |
207 // referenced CP entries along with the current entry to append. | |
208 // Indirect and double-indirect CP entries are handled by recursive | |
209 // calls to append_entry() as needed. The referenced CP entries are | |
210 // always appended to *merge_cp_p before the referee CP entry. These | |
211 // referenced CP entries may already exist in *merge_cp_p in which case | |
212 // there is nothing extra to append and only the current entry is | |
213 // appended. | |
214 void VM_RedefineClasses::append_entry(constantPoolHandle scratch_cp, | |
215 int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, | |
216 TRAPS) { | |
217 | |
218 // append is different depending on entry tag type | |
219 switch (scratch_cp->tag_at(scratch_i).value()) { | |
220 | |
221 // The old verifier is implemented outside the VM. It loads classes, | |
222 // but does not resolve constant pool entries directly so we never | |
223 // see Class entries here with the old verifier. Similarly the old | |
224 // verifier does not like Class entries in the input constant pool. | |
225 // The split-verifier is implemented in the VM so it can optionally | |
226 // and directly resolve constant pool entries to load classes. The | |
227 // split-verifier can accept either Class entries or UnresolvedClass | |
228 // entries in the input constant pool. We revert the appended copy | |
229 // back to UnresolvedClass so that either verifier will be happy | |
230 // with the constant pool entry. | |
231 case JVM_CONSTANT_Class: | |
232 { | |
233 // revert the copy to JVM_CONSTANT_UnresolvedClass | |
234 (*merge_cp_p)->unresolved_klass_at_put(*merge_cp_length_p, | |
235 scratch_cp->klass_name_at(scratch_i)); | |
236 | |
237 if (scratch_i != *merge_cp_length_p) { | |
238 // The new entry in *merge_cp_p is at a different index than | |
239 // the new entry in scratch_cp so we need to map the index values. | |
240 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
241 } | |
242 (*merge_cp_length_p)++; | |
243 } break; | |
244 | |
245 // these are direct CP entries so they can be directly appended, | |
246 // but double and long take two constant pool entries | |
247 case JVM_CONSTANT_Double: // fall through | |
248 case JVM_CONSTANT_Long: | |
249 { | |
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250 ConstantPool::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p, |
0 | 251 THREAD); |
252 | |
253 if (scratch_i != *merge_cp_length_p) { | |
254 // The new entry in *merge_cp_p is at a different index than | |
255 // the new entry in scratch_cp so we need to map the index values. | |
256 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
257 } | |
258 (*merge_cp_length_p) += 2; | |
259 } break; | |
260 | |
261 // these are direct CP entries so they can be directly appended | |
262 case JVM_CONSTANT_Float: // fall through | |
263 case JVM_CONSTANT_Integer: // fall through | |
264 case JVM_CONSTANT_Utf8: // fall through | |
265 | |
266 // This was an indirect CP entry, but it has been changed into | |
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267 // Symbol*s so this entry can be directly appended. |
0 | 268 case JVM_CONSTANT_String: // fall through |
269 | |
270 // These were indirect CP entries, but they have been changed into | |
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271 // Symbol*s so these entries can be directly appended. |
0 | 272 case JVM_CONSTANT_UnresolvedClass: // fall through |
273 { | |
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274 ConstantPool::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p, |
0 | 275 THREAD); |
276 | |
277 if (scratch_i != *merge_cp_length_p) { | |
278 // The new entry in *merge_cp_p is at a different index than | |
279 // the new entry in scratch_cp so we need to map the index values. | |
280 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
281 } | |
282 (*merge_cp_length_p)++; | |
283 } break; | |
284 | |
285 // this is an indirect CP entry so it needs special handling | |
286 case JVM_CONSTANT_NameAndType: | |
287 { | |
288 int name_ref_i = scratch_cp->name_ref_index_at(scratch_i); | |
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289 int new_name_ref_i = find_or_append_indirect_entry(scratch_cp, name_ref_i, merge_cp_p, |
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290 merge_cp_length_p, THREAD); |
0 | 291 |
292 int signature_ref_i = scratch_cp->signature_ref_index_at(scratch_i); | |
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293 int new_signature_ref_i = find_or_append_indirect_entry(scratch_cp, signature_ref_i, |
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294 merge_cp_p, merge_cp_length_p, |
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295 THREAD); |
0 | 296 |
297 // If the referenced entries already exist in *merge_cp_p, then | |
298 // both new_name_ref_i and new_signature_ref_i will both be 0. | |
299 // In that case, all we are appending is the current entry. | |
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300 if (new_name_ref_i != name_ref_i) { |
0 | 301 RC_TRACE(0x00080000, |
302 ("NameAndType entry@%d name_ref_index change: %d to %d", | |
303 *merge_cp_length_p, name_ref_i, new_name_ref_i)); | |
304 } | |
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305 if (new_signature_ref_i != signature_ref_i) { |
0 | 306 RC_TRACE(0x00080000, |
307 ("NameAndType entry@%d signature_ref_index change: %d to %d", | |
308 *merge_cp_length_p, signature_ref_i, new_signature_ref_i)); | |
309 } | |
310 | |
311 (*merge_cp_p)->name_and_type_at_put(*merge_cp_length_p, | |
312 new_name_ref_i, new_signature_ref_i); | |
313 if (scratch_i != *merge_cp_length_p) { | |
314 // The new entry in *merge_cp_p is at a different index than | |
315 // the new entry in scratch_cp so we need to map the index values. | |
316 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
317 } | |
318 (*merge_cp_length_p)++; | |
319 } break; | |
320 | |
321 // this is a double-indirect CP entry so it needs special handling | |
322 case JVM_CONSTANT_Fieldref: // fall through | |
323 case JVM_CONSTANT_InterfaceMethodref: // fall through | |
324 case JVM_CONSTANT_Methodref: | |
325 { | |
326 int klass_ref_i = scratch_cp->uncached_klass_ref_index_at(scratch_i); | |
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327 int new_klass_ref_i = find_or_append_indirect_entry(scratch_cp, klass_ref_i, |
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328 merge_cp_p, merge_cp_length_p, THREAD); |
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329 |
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330 int name_and_type_ref_i = scratch_cp->uncached_name_and_type_ref_index_at(scratch_i); |
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331 int new_name_and_type_ref_i = find_or_append_indirect_entry(scratch_cp, name_and_type_ref_i, |
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332 merge_cp_p, merge_cp_length_p, THREAD); |
0 | 333 |
334 const char *entry_name; | |
335 switch (scratch_cp->tag_at(scratch_i).value()) { | |
336 case JVM_CONSTANT_Fieldref: | |
337 entry_name = "Fieldref"; | |
338 (*merge_cp_p)->field_at_put(*merge_cp_length_p, new_klass_ref_i, | |
339 new_name_and_type_ref_i); | |
340 break; | |
341 case JVM_CONSTANT_InterfaceMethodref: | |
342 entry_name = "IFMethodref"; | |
343 (*merge_cp_p)->interface_method_at_put(*merge_cp_length_p, | |
344 new_klass_ref_i, new_name_and_type_ref_i); | |
345 break; | |
346 case JVM_CONSTANT_Methodref: | |
347 entry_name = "Methodref"; | |
348 (*merge_cp_p)->method_at_put(*merge_cp_length_p, new_klass_ref_i, | |
349 new_name_and_type_ref_i); | |
350 break; | |
351 default: | |
352 guarantee(false, "bad switch"); | |
353 break; | |
354 } | |
355 | |
356 if (klass_ref_i != new_klass_ref_i) { | |
357 RC_TRACE(0x00080000, ("%s entry@%d class_index changed: %d to %d", | |
358 entry_name, *merge_cp_length_p, klass_ref_i, new_klass_ref_i)); | |
359 } | |
360 if (name_and_type_ref_i != new_name_and_type_ref_i) { | |
361 RC_TRACE(0x00080000, | |
362 ("%s entry@%d name_and_type_index changed: %d to %d", | |
363 entry_name, *merge_cp_length_p, name_and_type_ref_i, | |
364 new_name_and_type_ref_i)); | |
365 } | |
366 | |
367 if (scratch_i != *merge_cp_length_p) { | |
368 // The new entry in *merge_cp_p is at a different index than | |
369 // the new entry in scratch_cp so we need to map the index values. | |
370 map_index(scratch_cp, scratch_i, *merge_cp_length_p); | |
371 } | |
372 (*merge_cp_length_p)++; | |
373 } break; | |
374 | |
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375 // this is an indirect CP entry so it needs special handling |
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376 case JVM_CONSTANT_MethodType: |
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377 { |
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378 int ref_i = scratch_cp->method_type_index_at(scratch_i); |
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379 int new_ref_i = find_or_append_indirect_entry(scratch_cp, ref_i, merge_cp_p, |
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380 merge_cp_length_p, THREAD); |
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381 if (new_ref_i != ref_i) { |
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382 RC_TRACE(0x00080000, |
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383 ("MethodType entry@%d ref_index change: %d to %d", |
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384 *merge_cp_length_p, ref_i, new_ref_i)); |
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385 } |
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386 (*merge_cp_p)->method_type_index_at_put(*merge_cp_length_p, new_ref_i); |
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387 if (scratch_i != *merge_cp_length_p) { |
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388 // The new entry in *merge_cp_p is at a different index than |
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389 // the new entry in scratch_cp so we need to map the index values. |
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390 map_index(scratch_cp, scratch_i, *merge_cp_length_p); |
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391 } |
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392 (*merge_cp_length_p)++; |
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393 } break; |
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394 |
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395 // this is an indirect CP entry so it needs special handling |
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396 case JVM_CONSTANT_MethodHandle: |
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397 { |
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398 int ref_kind = scratch_cp->method_handle_ref_kind_at(scratch_i); |
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399 int ref_i = scratch_cp->method_handle_index_at(scratch_i); |
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400 int new_ref_i = find_or_append_indirect_entry(scratch_cp, ref_i, merge_cp_p, |
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401 merge_cp_length_p, THREAD); |
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402 if (new_ref_i != ref_i) { |
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403 RC_TRACE(0x00080000, |
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404 ("MethodHandle entry@%d ref_index change: %d to %d", |
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405 *merge_cp_length_p, ref_i, new_ref_i)); |
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406 } |
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407 (*merge_cp_p)->method_handle_index_at_put(*merge_cp_length_p, ref_kind, new_ref_i); |
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408 if (scratch_i != *merge_cp_length_p) { |
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409 // The new entry in *merge_cp_p is at a different index than |
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410 // the new entry in scratch_cp so we need to map the index values. |
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411 map_index(scratch_cp, scratch_i, *merge_cp_length_p); |
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412 } |
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413 (*merge_cp_length_p)++; |
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414 } break; |
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415 |
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416 // this is an indirect CP entry so it needs special handling |
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417 case JVM_CONSTANT_InvokeDynamic: |
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418 { |
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419 // Index of the bootstrap specifier in the operands array |
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420 int old_bs_i = scratch_cp->invoke_dynamic_bootstrap_specifier_index(scratch_i); |
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421 int new_bs_i = find_or_append_operand(scratch_cp, old_bs_i, merge_cp_p, |
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422 merge_cp_length_p, THREAD); |
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423 // The bootstrap method NameAndType_info index |
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424 int old_ref_i = scratch_cp->invoke_dynamic_name_and_type_ref_index_at(scratch_i); |
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425 int new_ref_i = find_or_append_indirect_entry(scratch_cp, old_ref_i, merge_cp_p, |
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426 merge_cp_length_p, THREAD); |
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427 if (new_bs_i != old_bs_i) { |
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428 RC_TRACE(0x00080000, |
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429 ("InvokeDynamic entry@%d bootstrap_method_attr_index change: %d to %d", |
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430 *merge_cp_length_p, old_bs_i, new_bs_i)); |
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431 } |
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432 if (new_ref_i != old_ref_i) { |
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433 RC_TRACE(0x00080000, |
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434 ("InvokeDynamic entry@%d name_and_type_index change: %d to %d", |
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435 *merge_cp_length_p, old_ref_i, new_ref_i)); |
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436 } |
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437 |
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438 (*merge_cp_p)->invoke_dynamic_at_put(*merge_cp_length_p, new_bs_i, new_ref_i); |
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439 if (scratch_i != *merge_cp_length_p) { |
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440 // The new entry in *merge_cp_p is at a different index than |
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441 // the new entry in scratch_cp so we need to map the index values. |
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442 map_index(scratch_cp, scratch_i, *merge_cp_length_p); |
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443 } |
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444 (*merge_cp_length_p)++; |
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445 } break; |
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446 |
0 | 447 // At this stage, Class or UnresolvedClass could be here, but not |
448 // ClassIndex | |
449 case JVM_CONSTANT_ClassIndex: // fall through | |
450 | |
451 // Invalid is used as the tag for the second constant pool entry | |
452 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
453 // not be seen by itself. | |
454 case JVM_CONSTANT_Invalid: // fall through | |
455 | |
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456 // At this stage, String could be here, but not StringIndex |
0 | 457 case JVM_CONSTANT_StringIndex: // fall through |
458 | |
459 // At this stage JVM_CONSTANT_UnresolvedClassInError should not be | |
460 // here | |
461 case JVM_CONSTANT_UnresolvedClassInError: // fall through | |
462 | |
463 default: | |
464 { | |
465 // leave a breadcrumb | |
466 jbyte bad_value = scratch_cp->tag_at(scratch_i).value(); | |
467 ShouldNotReachHere(); | |
468 } break; | |
469 } // end switch tag value | |
470 } // end append_entry() | |
471 | |
472 | |
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473 int VM_RedefineClasses::find_or_append_indirect_entry(constantPoolHandle scratch_cp, |
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474 int ref_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) { |
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475 |
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476 int new_ref_i = ref_i; |
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477 bool match = (ref_i < *merge_cp_length_p) && |
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478 scratch_cp->compare_entry_to(ref_i, *merge_cp_p, ref_i, THREAD); |
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479 |
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480 if (!match) { |
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481 // forward reference in *merge_cp_p or not a direct match |
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482 int found_i = scratch_cp->find_matching_entry(ref_i, *merge_cp_p, THREAD); |
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483 if (found_i != 0) { |
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484 guarantee(found_i != ref_i, "compare_entry_to() and find_matching_entry() do not agree"); |
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485 // Found a matching entry somewhere else in *merge_cp_p so just need a mapping entry. |
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486 new_ref_i = found_i; |
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487 map_index(scratch_cp, ref_i, found_i); |
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488 } else { |
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489 // no match found so we have to append this entry to *merge_cp_p |
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490 append_entry(scratch_cp, ref_i, merge_cp_p, merge_cp_length_p, THREAD); |
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491 // The above call to append_entry() can only append one entry |
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492 // so the post call query of *merge_cp_length_p is only for |
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493 // the sake of consistency. |
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494 new_ref_i = *merge_cp_length_p - 1; |
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495 } |
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496 } |
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497 |
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498 return new_ref_i; |
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499 } // end find_or_append_indirect_entry() |
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500 |
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501 |
10151
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502 // Append a bootstrap specifier into the merge_cp operands that is semantically equal |
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503 // to the scratch_cp operands bootstrap specifier passed by the old_bs_i index. |
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504 // Recursively append new merge_cp entries referenced by the new bootstrap specifier. |
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505 void VM_RedefineClasses::append_operand(constantPoolHandle scratch_cp, int old_bs_i, |
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506 constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) { |
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507 |
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508 int old_ref_i = scratch_cp->operand_bootstrap_method_ref_index_at(old_bs_i); |
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509 int new_ref_i = find_or_append_indirect_entry(scratch_cp, old_ref_i, merge_cp_p, |
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510 merge_cp_length_p, THREAD); |
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511 if (new_ref_i != old_ref_i) { |
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512 RC_TRACE(0x00080000, |
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513 ("operands entry@%d bootstrap method ref_index change: %d to %d", |
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514 _operands_cur_length, old_ref_i, new_ref_i)); |
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515 } |
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516 |
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517 Array<u2>* merge_ops = (*merge_cp_p)->operands(); |
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518 int new_bs_i = _operands_cur_length; |
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519 // We have _operands_cur_length == 0 when the merge_cp operands is empty yet. |
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520 // However, the operand_offset_at(0) was set in the extend_operands() call. |
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521 int new_base = (new_bs_i == 0) ? (*merge_cp_p)->operand_offset_at(0) |
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522 : (*merge_cp_p)->operand_next_offset_at(new_bs_i - 1); |
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523 int argc = scratch_cp->operand_argument_count_at(old_bs_i); |
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524 |
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525 ConstantPool::operand_offset_at_put(merge_ops, _operands_cur_length, new_base); |
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526 merge_ops->at_put(new_base++, new_ref_i); |
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527 merge_ops->at_put(new_base++, argc); |
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528 |
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529 for (int i = 0; i < argc; i++) { |
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530 int old_arg_ref_i = scratch_cp->operand_argument_index_at(old_bs_i, i); |
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531 int new_arg_ref_i = find_or_append_indirect_entry(scratch_cp, old_arg_ref_i, merge_cp_p, |
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532 merge_cp_length_p, THREAD); |
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533 merge_ops->at_put(new_base++, new_arg_ref_i); |
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534 if (new_arg_ref_i != old_arg_ref_i) { |
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535 RC_TRACE(0x00080000, |
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536 ("operands entry@%d bootstrap method argument ref_index change: %d to %d", |
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537 _operands_cur_length, old_arg_ref_i, new_arg_ref_i)); |
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538 } |
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539 } |
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540 if (old_bs_i != _operands_cur_length) { |
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541 // The bootstrap specifier in *merge_cp_p is at a different index than |
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542 // that in scratch_cp so we need to map the index values. |
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543 map_operand_index(old_bs_i, new_bs_i); |
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544 } |
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545 _operands_cur_length++; |
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546 } // end append_operand() |
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547 |
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548 |
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549 int VM_RedefineClasses::find_or_append_operand(constantPoolHandle scratch_cp, |
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550 int old_bs_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) { |
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551 |
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552 int new_bs_i = old_bs_i; // bootstrap specifier index |
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553 bool match = (old_bs_i < _operands_cur_length) && |
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554 scratch_cp->compare_operand_to(old_bs_i, *merge_cp_p, old_bs_i, THREAD); |
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555 |
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556 if (!match) { |
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557 // forward reference in *merge_cp_p or not a direct match |
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558 int found_i = scratch_cp->find_matching_operand(old_bs_i, *merge_cp_p, |
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559 _operands_cur_length, THREAD); |
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560 if (found_i != -1) { |
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561 guarantee(found_i != old_bs_i, "compare_operand_to() and find_matching_operand() disagree"); |
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562 // found a matching operand somewhere else in *merge_cp_p so just need a mapping |
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563 new_bs_i = found_i; |
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564 map_operand_index(old_bs_i, found_i); |
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565 } else { |
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566 // no match found so we have to append this bootstrap specifier to *merge_cp_p |
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567 append_operand(scratch_cp, old_bs_i, merge_cp_p, merge_cp_length_p, THREAD); |
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568 new_bs_i = _operands_cur_length - 1; |
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569 } |
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570 } |
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571 return new_bs_i; |
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572 } // end find_or_append_operand() |
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573 |
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574 |
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575 void VM_RedefineClasses::finalize_operands_merge(constantPoolHandle merge_cp, TRAPS) { |
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576 if (merge_cp->operands() == NULL) { |
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577 return; |
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578 } |
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579 // Shrink the merge_cp operands |
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580 merge_cp->shrink_operands(_operands_cur_length, CHECK); |
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581 |
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582 if (RC_TRACE_ENABLED(0x00040000)) { |
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583 // don't want to loop unless we are tracing |
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584 int count = 0; |
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585 for (int i = 1; i < _operands_index_map_p->length(); i++) { |
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586 int value = _operands_index_map_p->at(i); |
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587 if (value != -1) { |
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588 RC_TRACE_WITH_THREAD(0x00040000, THREAD, |
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589 ("operands_index_map[%d]: old=%d new=%d", count, i, value)); |
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590 count++; |
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591 } |
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592 } |
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593 } |
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594 // Clean-up |
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595 _operands_index_map_p = NULL; |
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596 _operands_cur_length = 0; |
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597 _operands_index_map_count = 0; |
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598 } // end finalize_operands_merge() |
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599 |
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600 |
0 | 601 jvmtiError VM_RedefineClasses::compare_and_normalize_class_versions( |
602 instanceKlassHandle the_class, | |
603 instanceKlassHandle scratch_class) { | |
604 int i; | |
605 | |
606 // Check superclasses, or rather their names, since superclasses themselves can be | |
607 // requested to replace. | |
608 // Check for NULL superclass first since this might be java.lang.Object | |
609 if (the_class->super() != scratch_class->super() && | |
610 (the_class->super() == NULL || scratch_class->super() == NULL || | |
6983 | 611 the_class->super()->name() != |
612 scratch_class->super()->name())) { | |
0 | 613 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; |
614 } | |
615 | |
616 // Check if the number, names and order of directly implemented interfaces are the same. | |
617 // I think in principle we should just check if the sets of names of directly implemented | |
618 // interfaces are the same, i.e. the order of declaration (which, however, if changed in the | |
619 // .java file, also changes in .class file) should not matter. However, comparing sets is | |
620 // technically a bit more difficult, and, more importantly, I am not sure at present that the | |
621 // order of interfaces does not matter on the implementation level, i.e. that the VM does not | |
622 // rely on it somewhere. | |
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623 Array<Klass*>* k_interfaces = the_class->local_interfaces(); |
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624 Array<Klass*>* k_new_interfaces = scratch_class->local_interfaces(); |
0 | 625 int n_intfs = k_interfaces->length(); |
626 if (n_intfs != k_new_interfaces->length()) { | |
627 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; | |
628 } | |
629 for (i = 0; i < n_intfs; i++) { | |
6983 | 630 if (k_interfaces->at(i)->name() != |
631 k_new_interfaces->at(i)->name()) { | |
0 | 632 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED; |
633 } | |
634 } | |
635 | |
636 // Check whether class is in the error init state. | |
637 if (the_class->is_in_error_state()) { | |
638 // TBD #5057930: special error code is needed in 1.6 | |
639 return JVMTI_ERROR_INVALID_CLASS; | |
640 } | |
641 | |
642 // Check whether class modifiers are the same. | |
643 jushort old_flags = (jushort) the_class->access_flags().get_flags(); | |
644 jushort new_flags = (jushort) scratch_class->access_flags().get_flags(); | |
645 if (old_flags != new_flags) { | |
646 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_CLASS_MODIFIERS_CHANGED; | |
647 } | |
648 | |
649 // Check if the number, names, types and order of fields declared in these classes | |
650 // are the same. | |
3938 | 651 JavaFieldStream old_fs(the_class); |
652 JavaFieldStream new_fs(scratch_class); | |
653 for (; !old_fs.done() && !new_fs.done(); old_fs.next(), new_fs.next()) { | |
0 | 654 // access |
3938 | 655 old_flags = old_fs.access_flags().as_short(); |
656 new_flags = new_fs.access_flags().as_short(); | |
0 | 657 if ((old_flags ^ new_flags) & JVM_RECOGNIZED_FIELD_MODIFIERS) { |
658 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
659 } | |
660 // offset | |
3938 | 661 if (old_fs.offset() != new_fs.offset()) { |
0 | 662 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; |
663 } | |
664 // name and signature | |
3938 | 665 Symbol* name_sym1 = the_class->constants()->symbol_at(old_fs.name_index()); |
666 Symbol* sig_sym1 = the_class->constants()->symbol_at(old_fs.signature_index()); | |
667 Symbol* name_sym2 = scratch_class->constants()->symbol_at(new_fs.name_index()); | |
668 Symbol* sig_sym2 = scratch_class->constants()->symbol_at(new_fs.signature_index()); | |
0 | 669 if (name_sym1 != name_sym2 || sig_sym1 != sig_sym2) { |
670 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
671 } | |
672 } | |
673 | |
3938 | 674 // If both streams aren't done then we have a differing number of |
675 // fields. | |
676 if (!old_fs.done() || !new_fs.done()) { | |
677 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED; | |
678 } | |
679 | |
0 | 680 // Do a parallel walk through the old and new methods. Detect |
681 // cases where they match (exist in both), have been added in | |
682 // the new methods, or have been deleted (exist only in the | |
683 // old methods). The class file parser places methods in order | |
684 // by method name, but does not order overloaded methods by | |
685 // signature. In order to determine what fate befell the methods, | |
686 // this code places the overloaded new methods that have matching | |
687 // old methods in the same order as the old methods and places | |
688 // new overloaded methods at the end of overloaded methods of | |
689 // that name. The code for this order normalization is adapted | |
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690 // from the algorithm used in InstanceKlass::find_method(). |
0 | 691 // Since we are swapping out of order entries as we find them, |
692 // we only have to search forward through the overloaded methods. | |
693 // Methods which are added and have the same name as an existing | |
694 // method (but different signature) will be put at the end of | |
695 // the methods with that name, and the name mismatch code will | |
696 // handle them. | |
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697 Array<Method*>* k_old_methods(the_class->methods()); |
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698 Array<Method*>* k_new_methods(scratch_class->methods()); |
0 | 699 int n_old_methods = k_old_methods->length(); |
700 int n_new_methods = k_new_methods->length(); | |
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701 Thread* thread = Thread::current(); |
0 | 702 |
703 int ni = 0; | |
704 int oi = 0; | |
705 while (true) { | |
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706 Method* k_old_method; |
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707 Method* k_new_method; |
0 | 708 enum { matched, added, deleted, undetermined } method_was = undetermined; |
709 | |
710 if (oi >= n_old_methods) { | |
711 if (ni >= n_new_methods) { | |
712 break; // we've looked at everything, done | |
713 } | |
714 // New method at the end | |
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715 k_new_method = k_new_methods->at(ni); |
0 | 716 method_was = added; |
717 } else if (ni >= n_new_methods) { | |
718 // Old method, at the end, is deleted | |
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719 k_old_method = k_old_methods->at(oi); |
0 | 720 method_was = deleted; |
721 } else { | |
722 // There are more methods in both the old and new lists | |
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723 k_old_method = k_old_methods->at(oi); |
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724 k_new_method = k_new_methods->at(ni); |
0 | 725 if (k_old_method->name() != k_new_method->name()) { |
726 // Methods are sorted by method name, so a mismatch means added | |
727 // or deleted | |
728 if (k_old_method->name()->fast_compare(k_new_method->name()) > 0) { | |
729 method_was = added; | |
730 } else { | |
731 method_was = deleted; | |
732 } | |
733 } else if (k_old_method->signature() == k_new_method->signature()) { | |
734 // Both the name and signature match | |
735 method_was = matched; | |
736 } else { | |
737 // The name matches, but the signature doesn't, which means we have to | |
738 // search forward through the new overloaded methods. | |
739 int nj; // outside the loop for post-loop check | |
740 for (nj = ni + 1; nj < n_new_methods; nj++) { | |
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741 Method* m = k_new_methods->at(nj); |
0 | 742 if (k_old_method->name() != m->name()) { |
743 // reached another method name so no more overloaded methods | |
744 method_was = deleted; | |
745 break; | |
746 } | |
747 if (k_old_method->signature() == m->signature()) { | |
748 // found a match so swap the methods | |
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749 k_new_methods->at_put(ni, m); |
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750 k_new_methods->at_put(nj, k_new_method); |
0 | 751 k_new_method = m; |
752 method_was = matched; | |
753 break; | |
754 } | |
755 } | |
756 | |
757 if (nj >= n_new_methods) { | |
758 // reached the end without a match; so method was deleted | |
759 method_was = deleted; | |
760 } | |
761 } | |
762 } | |
763 | |
764 switch (method_was) { | |
765 case matched: | |
766 // methods match, be sure modifiers do too | |
767 old_flags = (jushort) k_old_method->access_flags().get_flags(); | |
768 new_flags = (jushort) k_new_method->access_flags().get_flags(); | |
769 if ((old_flags ^ new_flags) & ~(JVM_ACC_NATIVE)) { | |
770 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_MODIFIERS_CHANGED; | |
771 } | |
772 { | |
773 u2 new_num = k_new_method->method_idnum(); | |
774 u2 old_num = k_old_method->method_idnum(); | |
775 if (new_num != old_num) { | |
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776 Method* idnum_owner = scratch_class->method_with_idnum(old_num); |
0 | 777 if (idnum_owner != NULL) { |
778 // There is already a method assigned this idnum -- switch them | |
779 idnum_owner->set_method_idnum(new_num); | |
780 } | |
781 k_new_method->set_method_idnum(old_num); | |
8031 | 782 if (thread->has_pending_exception()) { |
783 return JVMTI_ERROR_OUT_OF_MEMORY; | |
784 } | |
0 | 785 } |
786 } | |
787 RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]", | |
788 k_new_method->name_and_sig_as_C_string(), ni, | |
789 k_old_method->name_and_sig_as_C_string(), oi)); | |
790 // advance to next pair of methods | |
791 ++oi; | |
792 ++ni; | |
793 break; | |
794 case added: | |
795 // method added, see if it is OK | |
796 new_flags = (jushort) k_new_method->access_flags().get_flags(); | |
797 if ((new_flags & JVM_ACC_PRIVATE) == 0 | |
798 // hack: private should be treated as final, but alas | |
799 || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0 | |
800 ) { | |
801 // new methods must be private | |
802 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED; | |
803 } | |
804 { | |
805 u2 num = the_class->next_method_idnum(); | |
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806 if (num == ConstMethod::UNSET_IDNUM) { |
0 | 807 // cannot add any more methods |
808 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED; | |
809 } | |
810 u2 new_num = k_new_method->method_idnum(); | |
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811 Method* idnum_owner = scratch_class->method_with_idnum(num); |
0 | 812 if (idnum_owner != NULL) { |
813 // There is already a method assigned this idnum -- switch them | |
814 idnum_owner->set_method_idnum(new_num); | |
815 } | |
816 k_new_method->set_method_idnum(num); | |
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817 if (thread->has_pending_exception()) { |
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818 return JVMTI_ERROR_OUT_OF_MEMORY; |
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819 } |
0 | 820 } |
821 RC_TRACE(0x00008000, ("Method added: new: %s [%d]", | |
822 k_new_method->name_and_sig_as_C_string(), ni)); | |
823 ++ni; // advance to next new method | |
824 break; | |
825 case deleted: | |
826 // method deleted, see if it is OK | |
827 old_flags = (jushort) k_old_method->access_flags().get_flags(); | |
828 if ((old_flags & JVM_ACC_PRIVATE) == 0 | |
829 // hack: private should be treated as final, but alas | |
830 || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0 | |
831 ) { | |
832 // deleted methods must be private | |
833 return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED; | |
834 } | |
835 RC_TRACE(0x00008000, ("Method deleted: old: %s [%d]", | |
836 k_old_method->name_and_sig_as_C_string(), oi)); | |
837 ++oi; // advance to next old method | |
838 break; | |
839 default: | |
840 ShouldNotReachHere(); | |
841 } | |
842 } | |
843 | |
844 return JVMTI_ERROR_NONE; | |
845 } | |
846 | |
847 | |
848 // Find new constant pool index value for old constant pool index value | |
849 // by seaching the index map. Returns zero (0) if there is no mapped | |
850 // value for the old constant pool index. | |
851 int VM_RedefineClasses::find_new_index(int old_index) { | |
852 if (_index_map_count == 0) { | |
853 // map is empty so nothing can be found | |
854 return 0; | |
855 } | |
856 | |
857 if (old_index < 1 || old_index >= _index_map_p->length()) { | |
858 // The old_index is out of range so it is not mapped. This should | |
859 // not happen in regular constant pool merging use, but it can | |
860 // happen if a corrupt annotation is processed. | |
861 return 0; | |
862 } | |
863 | |
864 int value = _index_map_p->at(old_index); | |
865 if (value == -1) { | |
866 // the old_index is not mapped | |
867 return 0; | |
868 } | |
869 | |
870 return value; | |
871 } // end find_new_index() | |
872 | |
873 | |
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874 // Find new bootstrap specifier index value for old bootstrap specifier index |
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875 // value by seaching the index map. Returns unused index (-1) if there is |
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876 // no mapped value for the old bootstrap specifier index. |
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877 int VM_RedefineClasses::find_new_operand_index(int old_index) { |
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878 if (_operands_index_map_count == 0) { |
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879 // map is empty so nothing can be found |
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880 return -1; |
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881 } |
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882 |
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883 if (old_index == -1 || old_index >= _operands_index_map_p->length()) { |
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884 // The old_index is out of range so it is not mapped. |
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885 // This should not happen in regular constant pool merging use. |
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886 return -1; |
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887 } |
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888 |
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889 int value = _operands_index_map_p->at(old_index); |
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890 if (value == -1) { |
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891 // the old_index is not mapped |
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892 return -1; |
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893 } |
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894 |
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895 return value; |
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896 } // end find_new_operand_index() |
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897 |
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898 |
0 | 899 // Returns true if the current mismatch is due to a resolved/unresolved |
900 // class pair. Otherwise, returns false. | |
901 bool VM_RedefineClasses::is_unresolved_class_mismatch(constantPoolHandle cp1, | |
902 int index1, constantPoolHandle cp2, int index2) { | |
903 | |
904 jbyte t1 = cp1->tag_at(index1).value(); | |
905 if (t1 != JVM_CONSTANT_Class && t1 != JVM_CONSTANT_UnresolvedClass) { | |
906 return false; // wrong entry type; not our special case | |
907 } | |
908 | |
909 jbyte t2 = cp2->tag_at(index2).value(); | |
910 if (t2 != JVM_CONSTANT_Class && t2 != JVM_CONSTANT_UnresolvedClass) { | |
911 return false; // wrong entry type; not our special case | |
912 } | |
913 | |
914 if (t1 == t2) { | |
915 return false; // not a mismatch; not our special case | |
916 } | |
917 | |
918 char *s1 = cp1->klass_name_at(index1)->as_C_string(); | |
919 char *s2 = cp2->klass_name_at(index2)->as_C_string(); | |
920 if (strcmp(s1, s2) != 0) { | |
921 return false; // strings don't match; not our special case | |
922 } | |
923 | |
924 return true; // made it through the gauntlet; this is our special case | |
925 } // end is_unresolved_class_mismatch() | |
926 | |
927 | |
928 jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) { | |
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929 |
0 | 930 // For consistency allocate memory using os::malloc wrapper. |
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931 _scratch_classes = (Klass**) |
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932 os::malloc(sizeof(Klass*) * _class_count, mtClass); |
0 | 933 if (_scratch_classes == NULL) { |
934 return JVMTI_ERROR_OUT_OF_MEMORY; | |
935 } | |
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936 // Zero initialize the _scratch_classes array. |
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937 for (int i = 0; i < _class_count; i++) { |
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938 _scratch_classes[i] = NULL; |
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939 } |
0 | 940 |
941 ResourceMark rm(THREAD); | |
942 | |
943 JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current()); | |
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944 // state can only be NULL if the current thread is exiting which |
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945 // should not happen since we're trying to do a RedefineClasses |
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946 guarantee(state != NULL, "exiting thread calling load_new_class_versions"); |
0 | 947 for (int i = 0; i < _class_count; i++) { |
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948 // Create HandleMark so that any handles created while loading new class |
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949 // versions are deleted. Constant pools are deallocated while merging |
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950 // constant pools |
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951 HandleMark hm(THREAD); |
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952 |
0 | 953 oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass); |
954 // classes for primitives cannot be redefined | |
955 if (!is_modifiable_class(mirror)) { | |
956 return JVMTI_ERROR_UNMODIFIABLE_CLASS; | |
957 } | |
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958 Klass* the_class_oop = java_lang_Class::as_Klass(mirror); |
0 | 959 instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop); |
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960 Symbol* the_class_sym = the_class->name(); |
0 | 961 |
962 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
963 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
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964 ("loading name=%s kind=%d (avail_mem=" UINT64_FORMAT "K)", |
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965 the_class->external_name(), _class_load_kind, |
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966 os::available_memory() >> 10)); |
0 | 967 |
968 ClassFileStream st((u1*) _class_defs[i].class_bytes, | |
969 _class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__"); | |
970 | |
971 // Parse the stream. | |
972 Handle the_class_loader(THREAD, the_class->class_loader()); | |
973 Handle protection_domain(THREAD, the_class->protection_domain()); | |
974 // Set redefined class handle in JvmtiThreadState class. | |
975 // This redefined class is sent to agent event handler for class file | |
976 // load hook event. | |
977 state->set_class_being_redefined(&the_class, _class_load_kind); | |
978 | |
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979 Klass* k = SystemDictionary::parse_stream(the_class_sym, |
0 | 980 the_class_loader, |
981 protection_domain, | |
982 &st, | |
983 THREAD); | |
984 // Clear class_being_redefined just to be sure. | |
985 state->clear_class_being_redefined(); | |
986 | |
987 // TODO: if this is retransform, and nothing changed we can skip it | |
988 | |
989 instanceKlassHandle scratch_class (THREAD, k); | |
990 | |
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991 // Need to clean up allocated InstanceKlass if there's an error so assign |
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992 // the result here. Caller deallocates all the scratch classes in case of |
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993 // an error. |
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994 _scratch_classes[i] = k; |
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995 |
0 | 996 if (HAS_PENDING_EXCEPTION) { |
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997 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
0 | 998 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
999 RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("parse_stream exception: '%s'", | |
1000 ex_name->as_C_string())); | |
1001 CLEAR_PENDING_EXCEPTION; | |
1002 | |
1003 if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) { | |
1004 return JVMTI_ERROR_UNSUPPORTED_VERSION; | |
1005 } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) { | |
1006 return JVMTI_ERROR_INVALID_CLASS_FORMAT; | |
1007 } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) { | |
1008 return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION; | |
1009 } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) { | |
1010 // The message will be "XXX (wrong name: YYY)" | |
1011 return JVMTI_ERROR_NAMES_DONT_MATCH; | |
1012 } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
1013 return JVMTI_ERROR_OUT_OF_MEMORY; | |
1014 } else { // Just in case more exceptions can be thrown.. | |
1015 return JVMTI_ERROR_FAILS_VERIFICATION; | |
1016 } | |
1017 } | |
1018 | |
1019 // Ensure class is linked before redefine | |
1020 if (!the_class->is_linked()) { | |
1021 the_class->link_class(THREAD); | |
1022 if (HAS_PENDING_EXCEPTION) { | |
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1023 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
0 | 1024 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
1025 RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("link_class exception: '%s'", | |
1026 ex_name->as_C_string())); | |
1027 CLEAR_PENDING_EXCEPTION; | |
1028 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
1029 return JVMTI_ERROR_OUT_OF_MEMORY; | |
1030 } else { | |
1031 return JVMTI_ERROR_INTERNAL; | |
1032 } | |
1033 } | |
1034 } | |
1035 | |
1036 // Do the validity checks in compare_and_normalize_class_versions() | |
1037 // before verifying the byte codes. By doing these checks first, we | |
1038 // limit the number of functions that require redirection from | |
1039 // the_class to scratch_class. In particular, we don't have to | |
1040 // modify JNI GetSuperclass() and thus won't change its performance. | |
1041 jvmtiError res = compare_and_normalize_class_versions(the_class, | |
1042 scratch_class); | |
1043 if (res != JVMTI_ERROR_NONE) { | |
1044 return res; | |
1045 } | |
1046 | |
1047 // verify what the caller passed us | |
1048 { | |
1049 // The bug 6214132 caused the verification to fail. | |
1050 // Information about the_class and scratch_class is temporarily | |
1051 // recorded into jvmtiThreadState. This data is used to redirect | |
1052 // the_class to scratch_class in the JVM_* functions called by the | |
1053 // verifier. Please, refer to jvmtiThreadState.hpp for the detailed | |
1054 // description. | |
1055 RedefineVerifyMark rvm(&the_class, &scratch_class, state); | |
1056 Verifier::verify( | |
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1057 scratch_class, Verifier::ThrowException, true, THREAD); |
0 | 1058 } |
1059 | |
1060 if (HAS_PENDING_EXCEPTION) { | |
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1061 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
0 | 1062 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
1063 RC_TRACE_WITH_THREAD(0x00000002, THREAD, | |
1064 ("verify_byte_codes exception: '%s'", ex_name->as_C_string())); | |
1065 CLEAR_PENDING_EXCEPTION; | |
1066 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
1067 return JVMTI_ERROR_OUT_OF_MEMORY; | |
1068 } else { | |
1069 // tell the caller the bytecodes are bad | |
1070 return JVMTI_ERROR_FAILS_VERIFICATION; | |
1071 } | |
1072 } | |
1073 | |
1074 res = merge_cp_and_rewrite(the_class, scratch_class, THREAD); | |
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1075 if (HAS_PENDING_EXCEPTION) { |
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1076 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
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1077 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
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1078 RC_TRACE_WITH_THREAD(0x00000002, THREAD, |
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1079 ("merge_cp_and_rewrite exception: '%s'", ex_name->as_C_string())); |
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1080 CLEAR_PENDING_EXCEPTION; |
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1081 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { |
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1082 return JVMTI_ERROR_OUT_OF_MEMORY; |
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1083 } else { |
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1084 return JVMTI_ERROR_INTERNAL; |
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1085 } |
0 | 1086 } |
1087 | |
1088 if (VerifyMergedCPBytecodes) { | |
1089 // verify what we have done during constant pool merging | |
1090 { | |
1091 RedefineVerifyMark rvm(&the_class, &scratch_class, state); | |
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1092 Verifier::verify(scratch_class, Verifier::ThrowException, true, THREAD); |
0 | 1093 } |
1094 | |
1095 if (HAS_PENDING_EXCEPTION) { | |
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1096 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
0 | 1097 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
1098 RC_TRACE_WITH_THREAD(0x00000002, THREAD, | |
1099 ("verify_byte_codes post merge-CP exception: '%s'", | |
1100 ex_name->as_C_string())); | |
1101 CLEAR_PENDING_EXCEPTION; | |
1102 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
1103 return JVMTI_ERROR_OUT_OF_MEMORY; | |
1104 } else { | |
1105 // tell the caller that constant pool merging screwed up | |
1106 return JVMTI_ERROR_INTERNAL; | |
1107 } | |
1108 } | |
1109 } | |
1110 | |
1111 Rewriter::rewrite(scratch_class, THREAD); | |
3748 | 1112 if (!HAS_PENDING_EXCEPTION) { |
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1113 scratch_class->link_methods(THREAD); |
3748 | 1114 } |
0 | 1115 if (HAS_PENDING_EXCEPTION) { |
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1116 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
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1117 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
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1118 RC_TRACE_WITH_THREAD(0x00000002, THREAD, |
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1119 ("Rewriter::rewrite or link_methods exception: '%s'", ex_name->as_C_string())); |
0 | 1120 CLEAR_PENDING_EXCEPTION; |
1121 if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) { | |
1122 return JVMTI_ERROR_OUT_OF_MEMORY; | |
1123 } else { | |
1124 return JVMTI_ERROR_INTERNAL; | |
1125 } | |
1126 } | |
1127 | |
1128 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark | |
1129 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
1130 ("loaded name=%s (avail_mem=" UINT64_FORMAT "K)", | |
1131 the_class->external_name(), os::available_memory() >> 10)); | |
1132 } | |
1133 | |
1134 return JVMTI_ERROR_NONE; | |
1135 } | |
1136 | |
1137 | |
1138 // Map old_index to new_index as needed. scratch_cp is only needed | |
1139 // for RC_TRACE() calls. | |
1140 void VM_RedefineClasses::map_index(constantPoolHandle scratch_cp, | |
1141 int old_index, int new_index) { | |
1142 if (find_new_index(old_index) != 0) { | |
1143 // old_index is already mapped | |
1144 return; | |
1145 } | |
1146 | |
1147 if (old_index == new_index) { | |
1148 // no mapping is needed | |
1149 return; | |
1150 } | |
1151 | |
1152 _index_map_p->at_put(old_index, new_index); | |
1153 _index_map_count++; | |
1154 | |
1155 RC_TRACE(0x00040000, ("mapped tag %d at index %d to %d", | |
1156 scratch_cp->tag_at(old_index).value(), old_index, new_index)); | |
1157 } // end map_index() | |
1158 | |
1159 | |
10151
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1160 // Map old_index to new_index as needed. |
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1161 void VM_RedefineClasses::map_operand_index(int old_index, int new_index) { |
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1162 if (find_new_operand_index(old_index) != -1) { |
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1163 // old_index is already mapped |
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1164 return; |
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1165 } |
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1166 |
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1167 if (old_index == new_index) { |
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1168 // no mapping is needed |
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1169 return; |
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1170 } |
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1171 |
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1172 _operands_index_map_p->at_put(old_index, new_index); |
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1173 _operands_index_map_count++; |
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1174 |
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1175 RC_TRACE(0x00040000, ("mapped bootstrap specifier at index %d to %d", old_index, new_index)); |
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1176 } // end map_index() |
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1177 |
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1178 |
0 | 1179 // Merge old_cp and scratch_cp and return the results of the merge via |
1180 // merge_cp_p. The number of entries in *merge_cp_p is returned via | |
1181 // merge_cp_length_p. The entries in old_cp occupy the same locations | |
1182 // in *merge_cp_p. Also creates a map of indices from entries in | |
1183 // scratch_cp to the corresponding entry in *merge_cp_p. Index map | |
1184 // entries are only created for entries in scratch_cp that occupy a | |
1185 // different location in *merged_cp_p. | |
1186 bool VM_RedefineClasses::merge_constant_pools(constantPoolHandle old_cp, | |
1187 constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p, | |
1188 int *merge_cp_length_p, TRAPS) { | |
1189 | |
1190 if (merge_cp_p == NULL) { | |
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1191 assert(false, "caller must provide scratch constantPool"); |
0 | 1192 return false; // robustness |
1193 } | |
1194 if (merge_cp_length_p == NULL) { | |
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1195 assert(false, "caller must provide scratch CP length"); |
0 | 1196 return false; // robustness |
1197 } | |
1198 // Worst case we need old_cp->length() + scratch_cp()->length(), | |
1199 // but the caller might be smart so make sure we have at least | |
1200 // the minimum. | |
1201 if ((*merge_cp_p)->length() < old_cp->length()) { | |
1202 assert(false, "merge area too small"); | |
1203 return false; // robustness | |
1204 } | |
1205 | |
1206 RC_TRACE_WITH_THREAD(0x00010000, THREAD, | |
1207 ("old_cp_len=%d, scratch_cp_len=%d", old_cp->length(), | |
1208 scratch_cp->length())); | |
1209 | |
1210 { | |
1211 // Pass 0: | |
1212 // The old_cp is copied to *merge_cp_p; this means that any code | |
1213 // using old_cp does not have to change. This work looks like a | |
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1214 // perfect fit for ConstantPool*::copy_cp_to(), but we need to |
0 | 1215 // handle one special case: |
1216 // - revert JVM_CONSTANT_Class to JVM_CONSTANT_UnresolvedClass | |
1217 // This will make verification happy. | |
1218 | |
1219 int old_i; // index into old_cp | |
1220 | |
1221 // index zero (0) is not used in constantPools | |
1222 for (old_i = 1; old_i < old_cp->length(); old_i++) { | |
1223 // leave debugging crumb | |
1224 jbyte old_tag = old_cp->tag_at(old_i).value(); | |
1225 switch (old_tag) { | |
1226 case JVM_CONSTANT_Class: | |
2332
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1227 case JVM_CONSTANT_UnresolvedClass: |
0 | 1228 // revert the copy to JVM_CONSTANT_UnresolvedClass |
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1229 // May be resolving while calling this so do the same for |
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1230 // JVM_CONSTANT_UnresolvedClass (klass_name_at() deals with transition) |
0 | 1231 (*merge_cp_p)->unresolved_klass_at_put(old_i, |
1232 old_cp->klass_name_at(old_i)); | |
1233 break; | |
1234 | |
1235 case JVM_CONSTANT_Double: | |
1236 case JVM_CONSTANT_Long: | |
1237 // just copy the entry to *merge_cp_p, but double and long take | |
1238 // two constant pool entries | |
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1239 ConstantPool::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0); |
0 | 1240 old_i++; |
1241 break; | |
1242 | |
1243 default: | |
1244 // just copy the entry to *merge_cp_p | |
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1245 ConstantPool::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0); |
0 | 1246 break; |
1247 } | |
1248 } // end for each old_cp entry | |
1249 | |
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1250 ConstantPool::copy_operands(old_cp, *merge_cp_p, CHECK_0); |
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1251 (*merge_cp_p)->extend_operands(scratch_cp, CHECK_0); |
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1252 |
0 | 1253 // We don't need to sanity check that *merge_cp_length_p is within |
1254 // *merge_cp_p bounds since we have the minimum on-entry check above. | |
1255 (*merge_cp_length_p) = old_i; | |
1256 } | |
1257 | |
1258 // merge_cp_len should be the same as old_cp->length() at this point | |
1259 // so this trace message is really a "warm-and-breathing" message. | |
1260 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
1261 ("after pass 0: merge_cp_len=%d", *merge_cp_length_p)); | |
1262 | |
1263 int scratch_i; // index into scratch_cp | |
1264 { | |
1265 // Pass 1a: | |
1266 // Compare scratch_cp entries to the old_cp entries that we have | |
1267 // already copied to *merge_cp_p. In this pass, we are eliminating | |
1268 // exact duplicates (matching entry at same index) so we only | |
1269 // compare entries in the common indice range. | |
1270 int increment = 1; | |
1271 int pass1a_length = MIN2(old_cp->length(), scratch_cp->length()); | |
1272 for (scratch_i = 1; scratch_i < pass1a_length; scratch_i += increment) { | |
1273 switch (scratch_cp->tag_at(scratch_i).value()) { | |
1274 case JVM_CONSTANT_Double: | |
1275 case JVM_CONSTANT_Long: | |
1276 // double and long take two constant pool entries | |
1277 increment = 2; | |
1278 break; | |
1279 | |
1280 default: | |
1281 increment = 1; | |
1282 break; | |
1283 } | |
1284 | |
1285 bool match = scratch_cp->compare_entry_to(scratch_i, *merge_cp_p, | |
1286 scratch_i, CHECK_0); | |
1287 if (match) { | |
1288 // found a match at the same index so nothing more to do | |
1289 continue; | |
1290 } else if (is_unresolved_class_mismatch(scratch_cp, scratch_i, | |
1291 *merge_cp_p, scratch_i)) { | |
1292 // The mismatch in compare_entry_to() above is because of a | |
1293 // resolved versus unresolved class entry at the same index | |
1294 // with the same string value. Since Pass 0 reverted any | |
1295 // class entries to unresolved class entries in *merge_cp_p, | |
1296 // we go with the unresolved class entry. | |
1297 continue; | |
1298 } | |
1299 | |
1300 int found_i = scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, | |
1301 CHECK_0); | |
1302 if (found_i != 0) { | |
1303 guarantee(found_i != scratch_i, | |
1304 "compare_entry_to() and find_matching_entry() do not agree"); | |
1305 | |
1306 // Found a matching entry somewhere else in *merge_cp_p so | |
1307 // just need a mapping entry. | |
1308 map_index(scratch_cp, scratch_i, found_i); | |
1309 continue; | |
1310 } | |
1311 | |
1312 // The find_matching_entry() call above could fail to find a match | |
1313 // due to a resolved versus unresolved class or string entry situation | |
1314 // like we solved above with the is_unresolved_*_mismatch() calls. | |
1315 // However, we would have to call is_unresolved_*_mismatch() over | |
1316 // all of *merge_cp_p (potentially) and that doesn't seem to be | |
1317 // worth the time. | |
1318 | |
1319 // No match found so we have to append this entry and any unique | |
1320 // referenced entries to *merge_cp_p. | |
1321 append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p, | |
1322 CHECK_0); | |
1323 } | |
1324 } | |
1325 | |
1326 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
1327 ("after pass 1a: merge_cp_len=%d, scratch_i=%d, index_map_len=%d", | |
1328 *merge_cp_length_p, scratch_i, _index_map_count)); | |
1329 | |
1330 if (scratch_i < scratch_cp->length()) { | |
1331 // Pass 1b: | |
1332 // old_cp is smaller than scratch_cp so there are entries in | |
1333 // scratch_cp that we have not yet processed. We take care of | |
1334 // those now. | |
1335 int increment = 1; | |
1336 for (; scratch_i < scratch_cp->length(); scratch_i += increment) { | |
1337 switch (scratch_cp->tag_at(scratch_i).value()) { | |
1338 case JVM_CONSTANT_Double: | |
1339 case JVM_CONSTANT_Long: | |
1340 // double and long take two constant pool entries | |
1341 increment = 2; | |
1342 break; | |
1343 | |
1344 default: | |
1345 increment = 1; | |
1346 break; | |
1347 } | |
1348 | |
1349 int found_i = | |
1350 scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, CHECK_0); | |
1351 if (found_i != 0) { | |
1352 // Found a matching entry somewhere else in *merge_cp_p so | |
1353 // just need a mapping entry. | |
1354 map_index(scratch_cp, scratch_i, found_i); | |
1355 continue; | |
1356 } | |
1357 | |
1358 // No match found so we have to append this entry and any unique | |
1359 // referenced entries to *merge_cp_p. | |
1360 append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p, | |
1361 CHECK_0); | |
1362 } | |
1363 | |
1364 RC_TRACE_WITH_THREAD(0x00020000, THREAD, | |
1365 ("after pass 1b: merge_cp_len=%d, scratch_i=%d, index_map_len=%d", | |
1366 *merge_cp_length_p, scratch_i, _index_map_count)); | |
1367 } | |
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1368 finalize_operands_merge(*merge_cp_p, THREAD); |
0 | 1369 |
1370 return true; | |
1371 } // end merge_constant_pools() | |
1372 | |
1373 | |
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1374 // Scoped object to clean up the constant pool(s) created for merging |
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1375 class MergeCPCleaner { |
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1376 ClassLoaderData* _loader_data; |
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1377 ConstantPool* _cp; |
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1378 ConstantPool* _scratch_cp; |
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1379 public: |
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1380 MergeCPCleaner(ClassLoaderData* loader_data, ConstantPool* merge_cp) : |
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1381 _loader_data(loader_data), _cp(merge_cp), _scratch_cp(NULL) {} |
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1382 ~MergeCPCleaner() { |
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1383 _loader_data->add_to_deallocate_list(_cp); |
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1384 if (_scratch_cp != NULL) { |
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1385 _loader_data->add_to_deallocate_list(_scratch_cp); |
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1386 } |
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1387 } |
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1388 void add_scratch_cp(ConstantPool* scratch_cp) { _scratch_cp = scratch_cp; } |
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1389 }; |
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1390 |
0 | 1391 // Merge constant pools between the_class and scratch_class and |
1392 // potentially rewrite bytecodes in scratch_class to use the merged | |
1393 // constant pool. | |
1394 jvmtiError VM_RedefineClasses::merge_cp_and_rewrite( | |
1395 instanceKlassHandle the_class, instanceKlassHandle scratch_class, | |
1396 TRAPS) { | |
1397 // worst case merged constant pool length is old and new combined | |
1398 int merge_cp_length = the_class->constants()->length() | |
1399 + scratch_class->constants()->length(); | |
1400 | |
1401 // Constant pools are not easily reused so we allocate a new one | |
1402 // each time. | |
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1403 // merge_cp is created unsafe for concurrent GC processing. It |
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1404 // should be marked safe before discarding it. Even though |
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1405 // garbage, if it crosses a card boundary, it may be scanned |
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1406 // in order to find the start of the first complete object on the card. |
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1407 ClassLoaderData* loader_data = the_class->class_loader_data(); |
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1408 ConstantPool* merge_cp_oop = |
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1409 ConstantPool::allocate(loader_data, |
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1410 merge_cp_length, |
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1411 CHECK_(JVMTI_ERROR_OUT_OF_MEMORY)); |
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1412 MergeCPCleaner cp_cleaner(loader_data, merge_cp_oop); |
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1413 |
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1414 HandleMark hm(THREAD); // make sure handles are cleared before |
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1415 // MergeCPCleaner clears out merge_cp_oop |
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1416 constantPoolHandle merge_cp(THREAD, merge_cp_oop); |
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1417 |
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1418 // Get constants() from the old class because it could have been rewritten |
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1419 // while we were at a safepoint allocating a new constant pool. |
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1420 constantPoolHandle old_cp(THREAD, the_class->constants()); |
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1421 constantPoolHandle scratch_cp(THREAD, scratch_class->constants()); |
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1422 |
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1423 // If the length changed, the class was redefined out from under us. Return |
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1424 // an error. |
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1425 if (merge_cp_length != the_class->constants()->length() |
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1426 + scratch_class->constants()->length()) { |
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1427 return JVMTI_ERROR_INTERNAL; |
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1428 } |
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1429 |
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1430 // Update the version number of the constant pool |
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1431 merge_cp->increment_and_save_version(old_cp->version()); |
0 | 1432 |
1433 ResourceMark rm(THREAD); | |
1434 _index_map_count = 0; | |
1435 _index_map_p = new intArray(scratch_cp->length(), -1); | |
1436 | |
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1437 _operands_cur_length = ConstantPool::operand_array_length(old_cp->operands()); |
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1438 _operands_index_map_count = 0; |
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1439 _operands_index_map_p = new intArray( |
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1440 ConstantPool::operand_array_length(scratch_cp->operands()), -1); |
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1441 |
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1442 // reference to the cp holder is needed for copy_operands() |
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1443 merge_cp->set_pool_holder(scratch_class()); |
0 | 1444 bool result = merge_constant_pools(old_cp, scratch_cp, &merge_cp, |
1445 &merge_cp_length, THREAD); | |
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1446 merge_cp->set_pool_holder(NULL); |
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1447 |
0 | 1448 if (!result) { |
1449 // The merge can fail due to memory allocation failure or due | |
1450 // to robustness checks. | |
1451 return JVMTI_ERROR_INTERNAL; | |
1452 } | |
1453 | |
1454 RC_TRACE_WITH_THREAD(0x00010000, THREAD, | |
1455 ("merge_cp_len=%d, index_map_len=%d", merge_cp_length, _index_map_count)); | |
1456 | |
1457 if (_index_map_count == 0) { | |
1458 // there is nothing to map between the new and merged constant pools | |
1459 | |
1460 if (old_cp->length() == scratch_cp->length()) { | |
1461 // The old and new constant pools are the same length and the | |
1462 // index map is empty. This means that the three constant pools | |
1463 // are equivalent (but not the same). Unfortunately, the new | |
1464 // constant pool has not gone through link resolution nor have | |
1465 // the new class bytecodes gone through constant pool cache | |
1466 // rewriting so we can't use the old constant pool with the new | |
1467 // class. | |
1468 | |
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1469 // toss the merged constant pool at return |
0 | 1470 } else if (old_cp->length() < scratch_cp->length()) { |
1471 // The old constant pool has fewer entries than the new constant | |
1472 // pool and the index map is empty. This means the new constant | |
1473 // pool is a superset of the old constant pool. However, the old | |
1474 // class bytecodes have already gone through constant pool cache | |
1475 // rewriting so we can't use the new constant pool with the old | |
1476 // class. | |
1477 | |
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1478 // toss the merged constant pool at return |
0 | 1479 } else { |
1480 // The old constant pool has more entries than the new constant | |
1481 // pool and the index map is empty. This means that both the old | |
1482 // and merged constant pools are supersets of the new constant | |
1483 // pool. | |
1484 | |
1485 // Replace the new constant pool with a shrunken copy of the | |
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1486 // merged constant pool |
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1487 set_new_constant_pool(loader_data, scratch_class, merge_cp, merge_cp_length, |
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1488 CHECK_(JVMTI_ERROR_OUT_OF_MEMORY)); |
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1489 // The new constant pool replaces scratch_cp so have cleaner clean it up. |
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1490 // It can't be cleaned up while there are handles to it. |
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1491 cp_cleaner.add_scratch_cp(scratch_cp()); |
0 | 1492 } |
1493 } else { | |
1494 if (RC_TRACE_ENABLED(0x00040000)) { | |
1495 // don't want to loop unless we are tracing | |
1496 int count = 0; | |
1497 for (int i = 1; i < _index_map_p->length(); i++) { | |
1498 int value = _index_map_p->at(i); | |
1499 | |
1500 if (value != -1) { | |
1501 RC_TRACE_WITH_THREAD(0x00040000, THREAD, | |
1502 ("index_map[%d]: old=%d new=%d", count, i, value)); | |
1503 count++; | |
1504 } | |
1505 } | |
1506 } | |
1507 | |
1508 // We have entries mapped between the new and merged constant pools | |
1509 // so we have to rewrite some constant pool references. | |
1510 if (!rewrite_cp_refs(scratch_class, THREAD)) { | |
1511 return JVMTI_ERROR_INTERNAL; | |
1512 } | |
1513 | |
1514 // Replace the new constant pool with a shrunken copy of the | |
1515 // merged constant pool so now the rewritten bytecodes have | |
1516 // valid references; the previous new constant pool will get | |
1517 // GCed. | |
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1518 set_new_constant_pool(loader_data, scratch_class, merge_cp, merge_cp_length, |
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1519 CHECK_(JVMTI_ERROR_OUT_OF_MEMORY)); |
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1520 // The new constant pool replaces scratch_cp so have cleaner clean it up. |
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1521 // It can't be cleaned up while there are handles to it. |
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1522 cp_cleaner.add_scratch_cp(scratch_cp()); |
0 | 1523 } |
1524 | |
1525 return JVMTI_ERROR_NONE; | |
1526 } // end merge_cp_and_rewrite() | |
1527 | |
1528 | |
1529 // Rewrite constant pool references in klass scratch_class. | |
1530 bool VM_RedefineClasses::rewrite_cp_refs(instanceKlassHandle scratch_class, | |
1531 TRAPS) { | |
1532 | |
1533 // rewrite constant pool references in the methods: | |
1534 if (!rewrite_cp_refs_in_methods(scratch_class, THREAD)) { | |
605 | 1535 // propagate failure back to caller |
0 | 1536 return false; |
1537 } | |
1538 | |
1539 // rewrite constant pool references in the class_annotations: | |
1540 if (!rewrite_cp_refs_in_class_annotations(scratch_class, THREAD)) { | |
605 | 1541 // propagate failure back to caller |
0 | 1542 return false; |
1543 } | |
1544 | |
1545 // rewrite constant pool references in the fields_annotations: | |
1546 if (!rewrite_cp_refs_in_fields_annotations(scratch_class, THREAD)) { | |
605 | 1547 // propagate failure back to caller |
0 | 1548 return false; |
1549 } | |
1550 | |
1551 // rewrite constant pool references in the methods_annotations: | |
1552 if (!rewrite_cp_refs_in_methods_annotations(scratch_class, THREAD)) { | |
605 | 1553 // propagate failure back to caller |
0 | 1554 return false; |
1555 } | |
1556 | |
1557 // rewrite constant pool references in the methods_parameter_annotations: | |
1558 if (!rewrite_cp_refs_in_methods_parameter_annotations(scratch_class, | |
1559 THREAD)) { | |
605 | 1560 // propagate failure back to caller |
0 | 1561 return false; |
1562 } | |
1563 | |
1564 // rewrite constant pool references in the methods_default_annotations: | |
1565 if (!rewrite_cp_refs_in_methods_default_annotations(scratch_class, | |
1566 THREAD)) { | |
605 | 1567 // propagate failure back to caller |
0 | 1568 return false; |
1569 } | |
1570 | |
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1571 // rewrite source file name index: |
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1572 u2 source_file_name_idx = scratch_class->source_file_name_index(); |
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1573 if (source_file_name_idx != 0) { |
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1574 u2 new_source_file_name_idx = find_new_index(source_file_name_idx); |
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1575 if (new_source_file_name_idx != 0) { |
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1576 scratch_class->set_source_file_name_index(new_source_file_name_idx); |
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1577 } |
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1578 } |
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1579 |
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1580 // rewrite class generic signature index: |
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1581 u2 generic_signature_index = scratch_class->generic_signature_index(); |
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1582 if (generic_signature_index != 0) { |
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1583 u2 new_generic_signature_index = find_new_index(generic_signature_index); |
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1584 if (new_generic_signature_index != 0) { |
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1585 scratch_class->set_generic_signature_index(new_generic_signature_index); |
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1586 } |
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1587 } |
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1588 |
0 | 1589 return true; |
1590 } // end rewrite_cp_refs() | |
1591 | |
1592 // Rewrite constant pool references in the methods. | |
1593 bool VM_RedefineClasses::rewrite_cp_refs_in_methods( | |
1594 instanceKlassHandle scratch_class, TRAPS) { | |
1595 | |
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1596 Array<Method*>* methods = scratch_class->methods(); |
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1597 |
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1598 if (methods == NULL || methods->length() == 0) { |
0 | 1599 // no methods so nothing to do |
1600 return true; | |
1601 } | |
1602 | |
1603 // rewrite constant pool references in the methods: | |
1604 for (int i = methods->length() - 1; i >= 0; i--) { | |
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1605 methodHandle method(THREAD, methods->at(i)); |
0 | 1606 methodHandle new_method; |
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1607 rewrite_cp_refs_in_method(method, &new_method, THREAD); |
0 | 1608 if (!new_method.is_null()) { |
1609 // the method has been replaced so save the new method version | |
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1610 // even in the case of an exception. original method is on the |
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1611 // deallocation list. |
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1612 methods->at_put(i, new_method()); |
0 | 1613 } |
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1614 if (HAS_PENDING_EXCEPTION) { |
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1615 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); |
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1616 // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark |
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1617 RC_TRACE_WITH_THREAD(0x00000002, THREAD, |
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1618 ("rewrite_cp_refs_in_method exception: '%s'", ex_name->as_C_string())); |
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1619 // Need to clear pending exception here as the super caller sets |
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1620 // the JVMTI_ERROR_INTERNAL if the returned value is false. |
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1621 CLEAR_PENDING_EXCEPTION; |
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1622 return false; |
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1623 } |
0 | 1624 } |
1625 | |
1626 return true; | |
1627 } | |
1628 | |
1629 | |
1630 // Rewrite constant pool references in the specific method. This code | |
1631 // was adapted from Rewriter::rewrite_method(). | |
1632 void VM_RedefineClasses::rewrite_cp_refs_in_method(methodHandle method, | |
1633 methodHandle *new_method_p, TRAPS) { | |
1634 | |
1635 *new_method_p = methodHandle(); // default is no new method | |
1636 | |
1637 // We cache a pointer to the bytecodes here in code_base. If GC | |
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1638 // moves the Method*, then the bytecodes will also move which |
0 | 1639 // will likely cause a crash. We create a No_Safepoint_Verifier |
1640 // object to detect whether we pass a possible safepoint in this | |
1641 // code block. | |
1642 No_Safepoint_Verifier nsv; | |
1643 | |
1644 // Bytecodes and their length | |
1645 address code_base = method->code_base(); | |
1646 int code_length = method->code_size(); | |
1647 | |
1648 int bc_length; | |
1649 for (int bci = 0; bci < code_length; bci += bc_length) { | |
1650 address bcp = code_base + bci; | |
1651 Bytecodes::Code c = (Bytecodes::Code)(*bcp); | |
1652 | |
1653 bc_length = Bytecodes::length_for(c); | |
1654 if (bc_length == 0) { | |
1655 // More complicated bytecodes report a length of zero so | |
1656 // we have to try again a slightly different way. | |
2142 | 1657 bc_length = Bytecodes::length_at(method(), bcp); |
0 | 1658 } |
1659 | |
1660 assert(bc_length != 0, "impossible bytecode length"); | |
1661 | |
1662 switch (c) { | |
1663 case Bytecodes::_ldc: | |
1664 { | |
1665 int cp_index = *(bcp + 1); | |
1666 int new_index = find_new_index(cp_index); | |
1667 | |
1668 if (StressLdcRewrite && new_index == 0) { | |
1669 // If we are stressing ldc -> ldc_w rewriting, then we | |
1670 // always need a new_index value. | |
1671 new_index = cp_index; | |
1672 } | |
1673 if (new_index != 0) { | |
1674 // the original index is mapped so we have more work to do | |
1675 if (!StressLdcRewrite && new_index <= max_jubyte) { | |
1676 // The new value can still use ldc instead of ldc_w | |
1677 // unless we are trying to stress ldc -> ldc_w rewriting | |
1678 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
1679 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c), | |
1680 bcp, cp_index, new_index)); | |
1681 *(bcp + 1) = new_index; | |
1682 } else { | |
1683 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
1684 ("%s->ldc_w@" INTPTR_FORMAT " old=%d, new=%d", | |
1685 Bytecodes::name(c), bcp, cp_index, new_index)); | |
1686 // the new value needs ldc_w instead of ldc | |
1687 u_char inst_buffer[4]; // max instruction size is 4 bytes | |
1688 bcp = (address)inst_buffer; | |
1689 // construct new instruction sequence | |
1690 *bcp = Bytecodes::_ldc_w; | |
1691 bcp++; | |
1692 // Rewriter::rewrite_method() does not rewrite ldc -> ldc_w. | |
1693 // See comment below for difference between put_Java_u2() | |
1694 // and put_native_u2(). | |
1695 Bytes::put_Java_u2(bcp, new_index); | |
1696 | |
1697 Relocator rc(method, NULL /* no RelocatorListener needed */); | |
1698 methodHandle m; | |
1699 { | |
1700 Pause_No_Safepoint_Verifier pnsv(&nsv); | |
1701 | |
1702 // ldc is 2 bytes and ldc_w is 3 bytes | |
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1703 m = rc.insert_space_at(bci, 3, inst_buffer, CHECK); |
0 | 1704 } |
1705 | |
1706 // return the new method so that the caller can update | |
1707 // the containing class | |
1708 *new_method_p = method = m; | |
1709 // switch our bytecode processing loop from the old method | |
1710 // to the new method | |
1711 code_base = method->code_base(); | |
1712 code_length = method->code_size(); | |
1713 bcp = code_base + bci; | |
1714 c = (Bytecodes::Code)(*bcp); | |
1715 bc_length = Bytecodes::length_for(c); | |
1716 assert(bc_length != 0, "sanity check"); | |
1717 } // end we need ldc_w instead of ldc | |
1718 } // end if there is a mapped index | |
1719 } break; | |
1720 | |
1721 // these bytecodes have a two-byte constant pool index | |
1722 case Bytecodes::_anewarray : // fall through | |
1723 case Bytecodes::_checkcast : // fall through | |
1724 case Bytecodes::_getfield : // fall through | |
1725 case Bytecodes::_getstatic : // fall through | |
1726 case Bytecodes::_instanceof : // fall through | |
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1727 case Bytecodes::_invokedynamic : // fall through |
0 | 1728 case Bytecodes::_invokeinterface: // fall through |
1729 case Bytecodes::_invokespecial : // fall through | |
1730 case Bytecodes::_invokestatic : // fall through | |
1731 case Bytecodes::_invokevirtual : // fall through | |
1732 case Bytecodes::_ldc_w : // fall through | |
1733 case Bytecodes::_ldc2_w : // fall through | |
1734 case Bytecodes::_multianewarray : // fall through | |
1735 case Bytecodes::_new : // fall through | |
1736 case Bytecodes::_putfield : // fall through | |
1737 case Bytecodes::_putstatic : | |
1738 { | |
1739 address p = bcp + 1; | |
1740 int cp_index = Bytes::get_Java_u2(p); | |
1741 int new_index = find_new_index(cp_index); | |
1742 if (new_index != 0) { | |
1743 // the original index is mapped so update w/ new value | |
1744 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
1745 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c), | |
1746 bcp, cp_index, new_index)); | |
1747 // Rewriter::rewrite_method() uses put_native_u2() in this | |
1748 // situation because it is reusing the constant pool index | |
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1749 // location for a native index into the ConstantPoolCache. |
0 | 1750 // Since we are updating the constant pool index prior to |
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1751 // verification and ConstantPoolCache initialization, we |
0 | 1752 // need to keep the new index in Java byte order. |
1753 Bytes::put_Java_u2(p, new_index); | |
1754 } | |
1755 } break; | |
1756 } | |
1757 } // end for each bytecode | |
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1758 |
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1759 // We also need to rewrite the parameter name indexes, if there is |
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1760 // method parameter data present |
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1761 if(method->has_method_parameters()) { |
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1762 const int len = method->method_parameters_length(); |
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1763 MethodParametersElement* elem = method->method_parameters_start(); |
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1764 |
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1765 for (int i = 0; i < len; i++) { |
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1766 const u2 cp_index = elem[i].name_cp_index; |
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1767 const u2 new_cp_index = find_new_index(cp_index); |
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1768 if (new_cp_index != 0) { |
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1769 elem[i].name_cp_index = new_cp_index; |
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1770 } |
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1771 } |
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1772 } |
0 | 1773 } // end rewrite_cp_refs_in_method() |
1774 | |
1775 | |
1776 // Rewrite constant pool references in the class_annotations field. | |
1777 bool VM_RedefineClasses::rewrite_cp_refs_in_class_annotations( | |
1778 instanceKlassHandle scratch_class, TRAPS) { | |
1779 | |
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1780 AnnotationArray* class_annotations = scratch_class->class_annotations(); |
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1781 if (class_annotations == NULL || class_annotations->length() == 0) { |
0 | 1782 // no class_annotations so nothing to do |
1783 return true; | |
1784 } | |
1785 | |
1786 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1787 ("class_annotations length=%d", class_annotations->length())); | |
1788 | |
1789 int byte_i = 0; // byte index into class_annotations | |
1790 return rewrite_cp_refs_in_annotations_typeArray(class_annotations, byte_i, | |
1791 THREAD); | |
1792 } | |
1793 | |
1794 | |
1795 // Rewrite constant pool references in an annotations typeArray. This | |
1796 // "structure" is adapted from the RuntimeVisibleAnnotations_attribute | |
1797 // that is described in section 4.8.15 of the 2nd-edition of the VM spec: | |
1798 // | |
1799 // annotations_typeArray { | |
1800 // u2 num_annotations; | |
1801 // annotation annotations[num_annotations]; | |
1802 // } | |
1803 // | |
1804 bool VM_RedefineClasses::rewrite_cp_refs_in_annotations_typeArray( | |
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1805 AnnotationArray* annotations_typeArray, int &byte_i_ref, TRAPS) { |
0 | 1806 |
1807 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
1808 // not enough room for num_annotations field | |
1809 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1810 ("length() is too small for num_annotations field")); | |
1811 return false; | |
1812 } | |
1813 | |
1814 u2 num_annotations = Bytes::get_Java_u2((address) | |
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1815 annotations_typeArray->adr_at(byte_i_ref)); |
0 | 1816 byte_i_ref += 2; |
1817 | |
1818 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1819 ("num_annotations=%d", num_annotations)); | |
1820 | |
1821 int calc_num_annotations = 0; | |
1822 for (; calc_num_annotations < num_annotations; calc_num_annotations++) { | |
1823 if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray, | |
1824 byte_i_ref, THREAD)) { | |
1825 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1826 ("bad annotation_struct at %d", calc_num_annotations)); | |
605 | 1827 // propagate failure back to caller |
0 | 1828 return false; |
1829 } | |
1830 } | |
1831 assert(num_annotations == calc_num_annotations, "sanity check"); | |
1832 | |
1833 return true; | |
1834 } // end rewrite_cp_refs_in_annotations_typeArray() | |
1835 | |
1836 | |
1837 // Rewrite constant pool references in the annotation struct portion of | |
1838 // an annotations_typeArray. This "structure" is from section 4.8.15 of | |
1839 // the 2nd-edition of the VM spec: | |
1840 // | |
1841 // struct annotation { | |
1842 // u2 type_index; | |
1843 // u2 num_element_value_pairs; | |
1844 // { | |
1845 // u2 element_name_index; | |
1846 // element_value value; | |
1847 // } element_value_pairs[num_element_value_pairs]; | |
1848 // } | |
1849 // | |
1850 bool VM_RedefineClasses::rewrite_cp_refs_in_annotation_struct( | |
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1851 AnnotationArray* annotations_typeArray, int &byte_i_ref, TRAPS) { |
0 | 1852 if ((byte_i_ref + 2 + 2) > annotations_typeArray->length()) { |
1853 // not enough room for smallest annotation_struct | |
1854 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1855 ("length() is too small for annotation_struct")); | |
1856 return false; | |
1857 } | |
1858 | |
1859 u2 type_index = rewrite_cp_ref_in_annotation_data(annotations_typeArray, | |
1860 byte_i_ref, "mapped old type_index=%d", THREAD); | |
1861 | |
1862 u2 num_element_value_pairs = Bytes::get_Java_u2((address) | |
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1863 annotations_typeArray->adr_at(byte_i_ref)); |
0 | 1864 byte_i_ref += 2; |
1865 | |
1866 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1867 ("type_index=%d num_element_value_pairs=%d", type_index, | |
1868 num_element_value_pairs)); | |
1869 | |
1870 int calc_num_element_value_pairs = 0; | |
1871 for (; calc_num_element_value_pairs < num_element_value_pairs; | |
1872 calc_num_element_value_pairs++) { | |
1873 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
1874 // not enough room for another element_name_index, let alone | |
1875 // the rest of another component | |
1876 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1877 ("length() is too small for element_name_index")); | |
1878 return false; | |
1879 } | |
1880 | |
1881 u2 element_name_index = rewrite_cp_ref_in_annotation_data( | |
1882 annotations_typeArray, byte_i_ref, | |
1883 "mapped old element_name_index=%d", THREAD); | |
1884 | |
1885 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1886 ("element_name_index=%d", element_name_index)); | |
1887 | |
1888 if (!rewrite_cp_refs_in_element_value(annotations_typeArray, | |
1889 byte_i_ref, THREAD)) { | |
1890 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1891 ("bad element_value at %d", calc_num_element_value_pairs)); | |
605 | 1892 // propagate failure back to caller |
0 | 1893 return false; |
1894 } | |
1895 } // end for each component | |
1896 assert(num_element_value_pairs == calc_num_element_value_pairs, | |
1897 "sanity check"); | |
1898 | |
1899 return true; | |
1900 } // end rewrite_cp_refs_in_annotation_struct() | |
1901 | |
1902 | |
1903 // Rewrite a constant pool reference at the current position in | |
1904 // annotations_typeArray if needed. Returns the original constant | |
1905 // pool reference if a rewrite was not needed or the new constant | |
1906 // pool reference if a rewrite was needed. | |
1907 u2 VM_RedefineClasses::rewrite_cp_ref_in_annotation_data( | |
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1908 AnnotationArray* annotations_typeArray, int &byte_i_ref, |
0 | 1909 const char * trace_mesg, TRAPS) { |
1910 | |
1911 address cp_index_addr = (address) | |
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1912 annotations_typeArray->adr_at(byte_i_ref); |
0 | 1913 u2 old_cp_index = Bytes::get_Java_u2(cp_index_addr); |
1914 u2 new_cp_index = find_new_index(old_cp_index); | |
1915 if (new_cp_index != 0) { | |
1916 RC_TRACE_WITH_THREAD(0x02000000, THREAD, (trace_mesg, old_cp_index)); | |
1917 Bytes::put_Java_u2(cp_index_addr, new_cp_index); | |
1918 old_cp_index = new_cp_index; | |
1919 } | |
1920 byte_i_ref += 2; | |
1921 return old_cp_index; | |
1922 } | |
1923 | |
1924 | |
1925 // Rewrite constant pool references in the element_value portion of an | |
1926 // annotations_typeArray. This "structure" is from section 4.8.15.1 of | |
1927 // the 2nd-edition of the VM spec: | |
1928 // | |
1929 // struct element_value { | |
1930 // u1 tag; | |
1931 // union { | |
1932 // u2 const_value_index; | |
1933 // { | |
1934 // u2 type_name_index; | |
1935 // u2 const_name_index; | |
1936 // } enum_const_value; | |
1937 // u2 class_info_index; | |
1938 // annotation annotation_value; | |
1939 // struct { | |
1940 // u2 num_values; | |
1941 // element_value values[num_values]; | |
1942 // } array_value; | |
1943 // } value; | |
1944 // } | |
1945 // | |
1946 bool VM_RedefineClasses::rewrite_cp_refs_in_element_value( | |
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1947 AnnotationArray* annotations_typeArray, int &byte_i_ref, TRAPS) { |
0 | 1948 |
1949 if ((byte_i_ref + 1) > annotations_typeArray->length()) { | |
1950 // not enough room for a tag let alone the rest of an element_value | |
1951 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1952 ("length() is too small for a tag")); | |
1953 return false; | |
1954 } | |
1955 | |
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1956 u1 tag = annotations_typeArray->at(byte_i_ref); |
0 | 1957 byte_i_ref++; |
1958 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("tag='%c'", tag)); | |
1959 | |
1960 switch (tag) { | |
1961 // These BaseType tag values are from Table 4.2 in VM spec: | |
1962 case 'B': // byte | |
1963 case 'C': // char | |
1964 case 'D': // double | |
1965 case 'F': // float | |
1966 case 'I': // int | |
1967 case 'J': // long | |
1968 case 'S': // short | |
1969 case 'Z': // boolean | |
1970 | |
1971 // The remaining tag values are from Table 4.8 in the 2nd-edition of | |
1972 // the VM spec: | |
1973 case 's': | |
1974 { | |
1975 // For the above tag values (including the BaseType values), | |
1976 // value.const_value_index is right union field. | |
1977 | |
1978 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
1979 // not enough room for a const_value_index | |
1980 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1981 ("length() is too small for a const_value_index")); | |
1982 return false; | |
1983 } | |
1984 | |
1985 u2 const_value_index = rewrite_cp_ref_in_annotation_data( | |
1986 annotations_typeArray, byte_i_ref, | |
1987 "mapped old const_value_index=%d", THREAD); | |
1988 | |
1989 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
1990 ("const_value_index=%d", const_value_index)); | |
1991 } break; | |
1992 | |
1993 case 'e': | |
1994 { | |
1995 // for the above tag value, value.enum_const_value is right union field | |
1996 | |
1997 if ((byte_i_ref + 4) > annotations_typeArray->length()) { | |
1998 // not enough room for a enum_const_value | |
1999 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2000 ("length() is too small for a enum_const_value")); | |
2001 return false; | |
2002 } | |
2003 | |
2004 u2 type_name_index = rewrite_cp_ref_in_annotation_data( | |
2005 annotations_typeArray, byte_i_ref, | |
2006 "mapped old type_name_index=%d", THREAD); | |
2007 | |
2008 u2 const_name_index = rewrite_cp_ref_in_annotation_data( | |
2009 annotations_typeArray, byte_i_ref, | |
2010 "mapped old const_name_index=%d", THREAD); | |
2011 | |
2012 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2013 ("type_name_index=%d const_name_index=%d", type_name_index, | |
2014 const_name_index)); | |
2015 } break; | |
2016 | |
2017 case 'c': | |
2018 { | |
2019 // for the above tag value, value.class_info_index is right union field | |
2020 | |
2021 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
2022 // not enough room for a class_info_index | |
2023 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2024 ("length() is too small for a class_info_index")); | |
2025 return false; | |
2026 } | |
2027 | |
2028 u2 class_info_index = rewrite_cp_ref_in_annotation_data( | |
2029 annotations_typeArray, byte_i_ref, | |
2030 "mapped old class_info_index=%d", THREAD); | |
2031 | |
2032 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2033 ("class_info_index=%d", class_info_index)); | |
2034 } break; | |
2035 | |
2036 case '@': | |
2037 // For the above tag value, value.attr_value is the right union | |
2038 // field. This is a nested annotation. | |
2039 if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray, | |
2040 byte_i_ref, THREAD)) { | |
605 | 2041 // propagate failure back to caller |
0 | 2042 return false; |
2043 } | |
2044 break; | |
2045 | |
2046 case '[': | |
2047 { | |
2048 if ((byte_i_ref + 2) > annotations_typeArray->length()) { | |
2049 // not enough room for a num_values field | |
2050 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2051 ("length() is too small for a num_values field")); | |
2052 return false; | |
2053 } | |
2054 | |
2055 // For the above tag value, value.array_value is the right union | |
2056 // field. This is an array of nested element_value. | |
2057 u2 num_values = Bytes::get_Java_u2((address) | |
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2058 annotations_typeArray->adr_at(byte_i_ref)); |
0 | 2059 byte_i_ref += 2; |
2060 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("num_values=%d", num_values)); | |
2061 | |
2062 int calc_num_values = 0; | |
2063 for (; calc_num_values < num_values; calc_num_values++) { | |
2064 if (!rewrite_cp_refs_in_element_value( | |
2065 annotations_typeArray, byte_i_ref, THREAD)) { | |
2066 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2067 ("bad nested element_value at %d", calc_num_values)); | |
605 | 2068 // propagate failure back to caller |
0 | 2069 return false; |
2070 } | |
2071 } | |
2072 assert(num_values == calc_num_values, "sanity check"); | |
2073 } break; | |
2074 | |
2075 default: | |
2076 RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("bad tag=0x%x", tag)); | |
2077 return false; | |
2078 } // end decode tag field | |
2079 | |
2080 return true; | |
2081 } // end rewrite_cp_refs_in_element_value() | |
2082 | |
2083 | |
2084 // Rewrite constant pool references in a fields_annotations field. | |
2085 bool VM_RedefineClasses::rewrite_cp_refs_in_fields_annotations( | |
2086 instanceKlassHandle scratch_class, TRAPS) { | |
2087 | |
8031 | 2088 Array<AnnotationArray*>* fields_annotations = scratch_class->fields_annotations(); |
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2089 |
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2090 if (fields_annotations == NULL || fields_annotations->length() == 0) { |
0 | 2091 // no fields_annotations so nothing to do |
2092 return true; | |
2093 } | |
2094 | |
2095 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2096 ("fields_annotations length=%d", fields_annotations->length())); | |
2097 | |
2098 for (int i = 0; i < fields_annotations->length(); i++) { | |
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2099 AnnotationArray* field_annotations = fields_annotations->at(i); |
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2100 if (field_annotations == NULL || field_annotations->length() == 0) { |
0 | 2101 // this field does not have any annotations so skip it |
2102 continue; | |
2103 } | |
2104 | |
2105 int byte_i = 0; // byte index into field_annotations | |
2106 if (!rewrite_cp_refs_in_annotations_typeArray(field_annotations, byte_i, | |
2107 THREAD)) { | |
2108 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2109 ("bad field_annotations at %d", i)); | |
605 | 2110 // propagate failure back to caller |
0 | 2111 return false; |
2112 } | |
2113 } | |
2114 | |
2115 return true; | |
2116 } // end rewrite_cp_refs_in_fields_annotations() | |
2117 | |
2118 | |
2119 // Rewrite constant pool references in a methods_annotations field. | |
2120 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_annotations( | |
2121 instanceKlassHandle scratch_class, TRAPS) { | |
2122 | |
8031 | 2123 for (int i = 0; i < scratch_class->methods()->length(); i++) { |
2124 Method* m = scratch_class->methods()->at(i); | |
2125 AnnotationArray* method_annotations = m->constMethod()->method_annotations(); | |
2126 | |
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2127 if (method_annotations == NULL || method_annotations->length() == 0) { |
0 | 2128 // this method does not have any annotations so skip it |
2129 continue; | |
2130 } | |
2131 | |
2132 int byte_i = 0; // byte index into method_annotations | |
2133 if (!rewrite_cp_refs_in_annotations_typeArray(method_annotations, byte_i, | |
2134 THREAD)) { | |
2135 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2136 ("bad method_annotations at %d", i)); | |
605 | 2137 // propagate failure back to caller |
0 | 2138 return false; |
2139 } | |
2140 } | |
2141 | |
2142 return true; | |
2143 } // end rewrite_cp_refs_in_methods_annotations() | |
2144 | |
2145 | |
2146 // Rewrite constant pool references in a methods_parameter_annotations | |
2147 // field. This "structure" is adapted from the | |
2148 // RuntimeVisibleParameterAnnotations_attribute described in section | |
2149 // 4.8.17 of the 2nd-edition of the VM spec: | |
2150 // | |
2151 // methods_parameter_annotations_typeArray { | |
2152 // u1 num_parameters; | |
2153 // { | |
2154 // u2 num_annotations; | |
2155 // annotation annotations[num_annotations]; | |
2156 // } parameter_annotations[num_parameters]; | |
2157 // } | |
2158 // | |
2159 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_parameter_annotations( | |
2160 instanceKlassHandle scratch_class, TRAPS) { | |
2161 | |
8031 | 2162 for (int i = 0; i < scratch_class->methods()->length(); i++) { |
2163 Method* m = scratch_class->methods()->at(i); | |
2164 AnnotationArray* method_parameter_annotations = m->constMethod()->parameter_annotations(); | |
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2165 if (method_parameter_annotations == NULL |
0 | 2166 || method_parameter_annotations->length() == 0) { |
2167 // this method does not have any parameter annotations so skip it | |
2168 continue; | |
2169 } | |
2170 | |
2171 if (method_parameter_annotations->length() < 1) { | |
2172 // not enough room for a num_parameters field | |
2173 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2174 ("length() is too small for a num_parameters field at %d", i)); | |
2175 return false; | |
2176 } | |
2177 | |
2178 int byte_i = 0; // byte index into method_parameter_annotations | |
2179 | |
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2180 u1 num_parameters = method_parameter_annotations->at(byte_i); |
0 | 2181 byte_i++; |
2182 | |
2183 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2184 ("num_parameters=%d", num_parameters)); | |
2185 | |
2186 int calc_num_parameters = 0; | |
2187 for (; calc_num_parameters < num_parameters; calc_num_parameters++) { | |
2188 if (!rewrite_cp_refs_in_annotations_typeArray( | |
2189 method_parameter_annotations, byte_i, THREAD)) { | |
2190 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2191 ("bad method_parameter_annotations at %d", calc_num_parameters)); | |
605 | 2192 // propagate failure back to caller |
0 | 2193 return false; |
2194 } | |
2195 } | |
2196 assert(num_parameters == calc_num_parameters, "sanity check"); | |
2197 } | |
2198 | |
2199 return true; | |
2200 } // end rewrite_cp_refs_in_methods_parameter_annotations() | |
2201 | |
2202 | |
2203 // Rewrite constant pool references in a methods_default_annotations | |
2204 // field. This "structure" is adapted from the AnnotationDefault_attribute | |
2205 // that is described in section 4.8.19 of the 2nd-edition of the VM spec: | |
2206 // | |
2207 // methods_default_annotations_typeArray { | |
2208 // element_value default_value; | |
2209 // } | |
2210 // | |
2211 bool VM_RedefineClasses::rewrite_cp_refs_in_methods_default_annotations( | |
2212 instanceKlassHandle scratch_class, TRAPS) { | |
2213 | |
8031 | 2214 for (int i = 0; i < scratch_class->methods()->length(); i++) { |
2215 Method* m = scratch_class->methods()->at(i); | |
2216 AnnotationArray* method_default_annotations = m->constMethod()->default_annotations(); | |
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2217 if (method_default_annotations == NULL |
0 | 2218 || method_default_annotations->length() == 0) { |
2219 // this method does not have any default annotations so skip it | |
2220 continue; | |
2221 } | |
2222 | |
2223 int byte_i = 0; // byte index into method_default_annotations | |
2224 | |
2225 if (!rewrite_cp_refs_in_element_value( | |
2226 method_default_annotations, byte_i, THREAD)) { | |
2227 RC_TRACE_WITH_THREAD(0x02000000, THREAD, | |
2228 ("bad default element_value at %d", i)); | |
605 | 2229 // propagate failure back to caller |
0 | 2230 return false; |
2231 } | |
2232 } | |
2233 | |
2234 return true; | |
2235 } // end rewrite_cp_refs_in_methods_default_annotations() | |
2236 | |
2237 | |
2238 // Rewrite constant pool references in the method's stackmap table. | |
2239 // These "structures" are adapted from the StackMapTable_attribute that | |
2240 // is described in section 4.8.4 of the 6.0 version of the VM spec | |
2241 // (dated 2005.10.26): | |
2242 // file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf | |
2243 // | |
2244 // stack_map { | |
2245 // u2 number_of_entries; | |
2246 // stack_map_frame entries[number_of_entries]; | |
2247 // } | |
2248 // | |
2249 void VM_RedefineClasses::rewrite_cp_refs_in_stack_map_table( | |
2250 methodHandle method, TRAPS) { | |
2251 | |
2252 if (!method->has_stackmap_table()) { | |
2253 return; | |
2254 } | |
2255 | |
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2256 AnnotationArray* stackmap_data = method->stackmap_data(); |
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2257 address stackmap_p = (address)stackmap_data->adr_at(0); |
0 | 2258 address stackmap_end = stackmap_p + stackmap_data->length(); |
2259 | |
2260 assert(stackmap_p + 2 <= stackmap_end, "no room for number_of_entries"); | |
2261 u2 number_of_entries = Bytes::get_Java_u2(stackmap_p); | |
2262 stackmap_p += 2; | |
2263 | |
2264 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
2265 ("number_of_entries=%u", number_of_entries)); | |
2266 | |
2267 // walk through each stack_map_frame | |
2268 u2 calc_number_of_entries = 0; | |
2269 for (; calc_number_of_entries < number_of_entries; calc_number_of_entries++) { | |
2270 // The stack_map_frame structure is a u1 frame_type followed by | |
2271 // 0 or more bytes of data: | |
2272 // | |
2273 // union stack_map_frame { | |
2274 // same_frame; | |
2275 // same_locals_1_stack_item_frame; | |
2276 // same_locals_1_stack_item_frame_extended; | |
2277 // chop_frame; | |
2278 // same_frame_extended; | |
2279 // append_frame; | |
2280 // full_frame; | |
2281 // } | |
2282 | |
2283 assert(stackmap_p + 1 <= stackmap_end, "no room for frame_type"); | |
2284 // The Linux compiler does not like frame_type to be u1 or u2. It | |
2285 // issues the following warning for the first if-statement below: | |
2286 // | |
2287 // "warning: comparison is always true due to limited range of data type" | |
2288 // | |
2289 u4 frame_type = *stackmap_p; | |
2290 stackmap_p++; | |
2291 | |
2292 // same_frame { | |
2293 // u1 frame_type = SAME; /* 0-63 */ | |
2294 // } | |
2295 if (frame_type >= 0 && frame_type <= 63) { | |
2296 // nothing more to do for same_frame | |
2297 } | |
2298 | |
2299 // same_locals_1_stack_item_frame { | |
2300 // u1 frame_type = SAME_LOCALS_1_STACK_ITEM; /* 64-127 */ | |
2301 // verification_type_info stack[1]; | |
2302 // } | |
2303 else if (frame_type >= 64 && frame_type <= 127) { | |
2304 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
2305 calc_number_of_entries, frame_type, THREAD); | |
2306 } | |
2307 | |
2308 // reserved for future use | |
2309 else if (frame_type >= 128 && frame_type <= 246) { | |
2310 // nothing more to do for reserved frame_types | |
2311 } | |
2312 | |
2313 // same_locals_1_stack_item_frame_extended { | |
2314 // u1 frame_type = SAME_LOCALS_1_STACK_ITEM_EXTENDED; /* 247 */ | |
2315 // u2 offset_delta; | |
2316 // verification_type_info stack[1]; | |
2317 // } | |
2318 else if (frame_type == 247) { | |
2319 stackmap_p += 2; | |
2320 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
2321 calc_number_of_entries, frame_type, THREAD); | |
2322 } | |
2323 | |
2324 // chop_frame { | |
2325 // u1 frame_type = CHOP; /* 248-250 */ | |
2326 // u2 offset_delta; | |
2327 // } | |
2328 else if (frame_type >= 248 && frame_type <= 250) { | |
2329 stackmap_p += 2; | |
2330 } | |
2331 | |
2332 // same_frame_extended { | |
2333 // u1 frame_type = SAME_FRAME_EXTENDED; /* 251*/ | |
2334 // u2 offset_delta; | |
2335 // } | |
2336 else if (frame_type == 251) { | |
2337 stackmap_p += 2; | |
2338 } | |
2339 | |
2340 // append_frame { | |
2341 // u1 frame_type = APPEND; /* 252-254 */ | |
2342 // u2 offset_delta; | |
2343 // verification_type_info locals[frame_type - 251]; | |
2344 // } | |
2345 else if (frame_type >= 252 && frame_type <= 254) { | |
2346 assert(stackmap_p + 2 <= stackmap_end, | |
2347 "no room for offset_delta"); | |
2348 stackmap_p += 2; | |
2349 u1 len = frame_type - 251; | |
2350 for (u1 i = 0; i < len; i++) { | |
2351 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
2352 calc_number_of_entries, frame_type, THREAD); | |
2353 } | |
2354 } | |
2355 | |
2356 // full_frame { | |
2357 // u1 frame_type = FULL_FRAME; /* 255 */ | |
2358 // u2 offset_delta; | |
2359 // u2 number_of_locals; | |
2360 // verification_type_info locals[number_of_locals]; | |
2361 // u2 number_of_stack_items; | |
2362 // verification_type_info stack[number_of_stack_items]; | |
2363 // } | |
2364 else if (frame_type == 255) { | |
2365 assert(stackmap_p + 2 + 2 <= stackmap_end, | |
2366 "no room for smallest full_frame"); | |
2367 stackmap_p += 2; | |
2368 | |
2369 u2 number_of_locals = Bytes::get_Java_u2(stackmap_p); | |
2370 stackmap_p += 2; | |
2371 | |
2372 for (u2 locals_i = 0; locals_i < number_of_locals; locals_i++) { | |
2373 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
2374 calc_number_of_entries, frame_type, THREAD); | |
2375 } | |
2376 | |
2377 // Use the largest size for the number_of_stack_items, but only get | |
2378 // the right number of bytes. | |
2379 u2 number_of_stack_items = Bytes::get_Java_u2(stackmap_p); | |
2380 stackmap_p += 2; | |
2381 | |
2382 for (u2 stack_i = 0; stack_i < number_of_stack_items; stack_i++) { | |
2383 rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end, | |
2384 calc_number_of_entries, frame_type, THREAD); | |
2385 } | |
2386 } | |
2387 } // end while there is a stack_map_frame | |
2388 assert(number_of_entries == calc_number_of_entries, "sanity check"); | |
2389 } // end rewrite_cp_refs_in_stack_map_table() | |
2390 | |
2391 | |
2392 // Rewrite constant pool references in the verification type info | |
2393 // portion of the method's stackmap table. These "structures" are | |
2394 // adapted from the StackMapTable_attribute that is described in | |
2395 // section 4.8.4 of the 6.0 version of the VM spec (dated 2005.10.26): | |
2396 // file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf | |
2397 // | |
2398 // The verification_type_info structure is a u1 tag followed by 0 or | |
2399 // more bytes of data: | |
2400 // | |
2401 // union verification_type_info { | |
2402 // Top_variable_info; | |
2403 // Integer_variable_info; | |
2404 // Float_variable_info; | |
2405 // Long_variable_info; | |
2406 // Double_variable_info; | |
2407 // Null_variable_info; | |
2408 // UninitializedThis_variable_info; | |
2409 // Object_variable_info; | |
2410 // Uninitialized_variable_info; | |
2411 // } | |
2412 // | |
2413 void VM_RedefineClasses::rewrite_cp_refs_in_verification_type_info( | |
2414 address& stackmap_p_ref, address stackmap_end, u2 frame_i, | |
2415 u1 frame_type, TRAPS) { | |
2416 | |
2417 assert(stackmap_p_ref + 1 <= stackmap_end, "no room for tag"); | |
2418 u1 tag = *stackmap_p_ref; | |
2419 stackmap_p_ref++; | |
2420 | |
2421 switch (tag) { | |
2422 // Top_variable_info { | |
2423 // u1 tag = ITEM_Top; /* 0 */ | |
2424 // } | |
2425 // verificationType.hpp has zero as ITEM_Bogus instead of ITEM_Top | |
2426 case 0: // fall through | |
2427 | |
2428 // Integer_variable_info { | |
2429 // u1 tag = ITEM_Integer; /* 1 */ | |
2430 // } | |
2431 case ITEM_Integer: // fall through | |
2432 | |
2433 // Float_variable_info { | |
2434 // u1 tag = ITEM_Float; /* 2 */ | |
2435 // } | |
2436 case ITEM_Float: // fall through | |
2437 | |
2438 // Double_variable_info { | |
2439 // u1 tag = ITEM_Double; /* 3 */ | |
2440 // } | |
2441 case ITEM_Double: // fall through | |
2442 | |
2443 // Long_variable_info { | |
2444 // u1 tag = ITEM_Long; /* 4 */ | |
2445 // } | |
2446 case ITEM_Long: // fall through | |
2447 | |
2448 // Null_variable_info { | |
2449 // u1 tag = ITEM_Null; /* 5 */ | |
2450 // } | |
2451 case ITEM_Null: // fall through | |
2452 | |
2453 // UninitializedThis_variable_info { | |
2454 // u1 tag = ITEM_UninitializedThis; /* 6 */ | |
2455 // } | |
2456 case ITEM_UninitializedThis: | |
2457 // nothing more to do for the above tag types | |
2458 break; | |
2459 | |
2460 // Object_variable_info { | |
2461 // u1 tag = ITEM_Object; /* 7 */ | |
2462 // u2 cpool_index; | |
2463 // } | |
2464 case ITEM_Object: | |
2465 { | |
2466 assert(stackmap_p_ref + 2 <= stackmap_end, "no room for cpool_index"); | |
2467 u2 cpool_index = Bytes::get_Java_u2(stackmap_p_ref); | |
2468 u2 new_cp_index = find_new_index(cpool_index); | |
2469 if (new_cp_index != 0) { | |
2470 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
2471 ("mapped old cpool_index=%d", cpool_index)); | |
2472 Bytes::put_Java_u2(stackmap_p_ref, new_cp_index); | |
2473 cpool_index = new_cp_index; | |
2474 } | |
2475 stackmap_p_ref += 2; | |
2476 | |
2477 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
2478 ("frame_i=%u, frame_type=%u, cpool_index=%d", frame_i, | |
2479 frame_type, cpool_index)); | |
2480 } break; | |
2481 | |
2482 // Uninitialized_variable_info { | |
2483 // u1 tag = ITEM_Uninitialized; /* 8 */ | |
2484 // u2 offset; | |
2485 // } | |
2486 case ITEM_Uninitialized: | |
2487 assert(stackmap_p_ref + 2 <= stackmap_end, "no room for offset"); | |
2488 stackmap_p_ref += 2; | |
2489 break; | |
2490 | |
2491 default: | |
2492 RC_TRACE_WITH_THREAD(0x04000000, THREAD, | |
2493 ("frame_i=%u, frame_type=%u, bad tag=0x%x", frame_i, frame_type, tag)); | |
2494 ShouldNotReachHere(); | |
2495 break; | |
2496 } // end switch (tag) | |
2497 } // end rewrite_cp_refs_in_verification_type_info() | |
2498 | |
2499 | |
2500 // Change the constant pool associated with klass scratch_class to | |
2501 // scratch_cp. If shrink is true, then scratch_cp_length elements | |
2502 // are copied from scratch_cp to a smaller constant pool and the | |
2503 // smaller constant pool is associated with scratch_class. | |
2504 void VM_RedefineClasses::set_new_constant_pool( | |
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2505 ClassLoaderData* loader_data, |
0 | 2506 instanceKlassHandle scratch_class, constantPoolHandle scratch_cp, |
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2507 int scratch_cp_length, TRAPS) { |
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2508 assert(scratch_cp->length() >= scratch_cp_length, "sanity check"); |
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2509 |
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2510 // scratch_cp is a merged constant pool and has enough space for a |
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2511 // worst case merge situation. We want to associate the minimum |
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2512 // sized constant pool with the klass to save space. |
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2513 ConstantPool* cp = ConstantPool::allocate(loader_data, scratch_cp_length, CHECK); |
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2514 constantPoolHandle smaller_cp(THREAD, cp); |
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2515 |
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2516 // preserve version() value in the smaller copy |
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2517 int version = scratch_cp->version(); |
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2518 assert(version != 0, "sanity check"); |
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2519 smaller_cp->set_version(version); |
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2520 |
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2521 // attach klass to new constant pool |
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2522 // reference to the cp holder is needed for copy_operands() |
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2523 smaller_cp->set_pool_holder(scratch_class()); |
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2524 |
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2525 scratch_cp->copy_cp_to(1, scratch_cp_length - 1, smaller_cp, 1, THREAD); |
12208
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2526 if (HAS_PENDING_EXCEPTION) { |
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2527 // Exception is handled in the caller |
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2528 loader_data->add_to_deallocate_list(smaller_cp()); |
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2529 return; |
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2530 } |
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2531 scratch_cp = smaller_cp; |
0 | 2532 |
2533 // attach new constant pool to klass | |
2534 scratch_class->set_constants(scratch_cp()); | |
2535 | |
2536 int i; // for portability | |
2537 | |
2538 // update each field in klass to use new constant pool indices as needed | |
3938 | 2539 for (JavaFieldStream fs(scratch_class); !fs.done(); fs.next()) { |
2540 jshort cur_index = fs.name_index(); | |
0 | 2541 jshort new_index = find_new_index(cur_index); |
2542 if (new_index != 0) { | |
2543 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2544 ("field-name_index change: %d to %d", cur_index, new_index)); | |
3938 | 2545 fs.set_name_index(new_index); |
0 | 2546 } |
3938 | 2547 cur_index = fs.signature_index(); |
0 | 2548 new_index = find_new_index(cur_index); |
2549 if (new_index != 0) { | |
2550 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2551 ("field-signature_index change: %d to %d", cur_index, new_index)); | |
3938 | 2552 fs.set_signature_index(new_index); |
0 | 2553 } |
3938 | 2554 cur_index = fs.initval_index(); |
0 | 2555 new_index = find_new_index(cur_index); |
2556 if (new_index != 0) { | |
2557 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2558 ("field-initval_index change: %d to %d", cur_index, new_index)); | |
3938 | 2559 fs.set_initval_index(new_index); |
0 | 2560 } |
3938 | 2561 cur_index = fs.generic_signature_index(); |
0 | 2562 new_index = find_new_index(cur_index); |
2563 if (new_index != 0) { | |
2564 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2565 ("field-generic_signature change: %d to %d", cur_index, new_index)); | |
3938 | 2566 fs.set_generic_signature_index(new_index); |
0 | 2567 } |
2568 } // end for each field | |
2569 | |
2570 // Update constant pool indices in the inner classes info to use | |
2571 // new constant indices as needed. The inner classes info is a | |
2572 // quadruple: | |
2573 // (inner_class_info, outer_class_info, inner_name, inner_access_flags) | |
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2574 InnerClassesIterator iter(scratch_class); |
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2575 for (; !iter.done(); iter.next()) { |
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2576 int cur_index = iter.inner_class_info_index(); |
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2577 if (cur_index == 0) { |
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2578 continue; // JVM spec. allows null inner class refs so skip it |
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2579 } |
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2580 int new_index = find_new_index(cur_index); |
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2581 if (new_index != 0) { |
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2582 RC_TRACE_WITH_THREAD(0x00080000, THREAD, |
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2583 ("inner_class_info change: %d to %d", cur_index, new_index)); |
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2584 iter.set_inner_class_info_index(new_index); |
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2585 } |
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2586 cur_index = iter.outer_class_info_index(); |
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2587 new_index = find_new_index(cur_index); |
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2588 if (new_index != 0) { |
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2589 RC_TRACE_WITH_THREAD(0x00080000, THREAD, |
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2590 ("outer_class_info change: %d to %d", cur_index, new_index)); |
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2591 iter.set_outer_class_info_index(new_index); |
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2592 } |
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2593 cur_index = iter.inner_name_index(); |
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2594 new_index = find_new_index(cur_index); |
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2595 if (new_index != 0) { |
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2596 RC_TRACE_WITH_THREAD(0x00080000, THREAD, |
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2597 ("inner_name change: %d to %d", cur_index, new_index)); |
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2598 iter.set_inner_name_index(new_index); |
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2599 } |
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2600 } // end for each inner class |
0 | 2601 |
2602 // Attach each method in klass to the new constant pool and update | |
2603 // to use new constant pool indices as needed: | |
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2604 Array<Method*>* methods = scratch_class->methods(); |
0 | 2605 for (i = methods->length() - 1; i >= 0; i--) { |
6725
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2606 methodHandle method(THREAD, methods->at(i)); |
0 | 2607 method->set_constants(scratch_cp()); |
2608 | |
2609 int new_index = find_new_index(method->name_index()); | |
2610 if (new_index != 0) { | |
2611 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2612 ("method-name_index change: %d to %d", method->name_index(), | |
2613 new_index)); | |
2614 method->set_name_index(new_index); | |
2615 } | |
2616 new_index = find_new_index(method->signature_index()); | |
2617 if (new_index != 0) { | |
2618 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2619 ("method-signature_index change: %d to %d", | |
2620 method->signature_index(), new_index)); | |
2621 method->set_signature_index(new_index); | |
2622 } | |
2623 new_index = find_new_index(method->generic_signature_index()); | |
2624 if (new_index != 0) { | |
2625 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2626 ("method-generic_signature_index change: %d to %d", | |
2627 method->generic_signature_index(), new_index)); | |
2628 method->set_generic_signature_index(new_index); | |
2629 } | |
2630 | |
2631 // Update constant pool indices in the method's checked exception | |
2632 // table to use new constant indices as needed. | |
2633 int cext_length = method->checked_exceptions_length(); | |
2634 if (cext_length > 0) { | |
2635 CheckedExceptionElement * cext_table = | |
2636 method->checked_exceptions_start(); | |
2637 for (int j = 0; j < cext_length; j++) { | |
2638 int cur_index = cext_table[j].class_cp_index; | |
2639 int new_index = find_new_index(cur_index); | |
2640 if (new_index != 0) { | |
2641 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2642 ("cext-class_cp_index change: %d to %d", cur_index, new_index)); | |
2643 cext_table[j].class_cp_index = (u2)new_index; | |
2644 } | |
2645 } // end for each checked exception table entry | |
2646 } // end if there are checked exception table entries | |
2647 | |
2648 // Update each catch type index in the method's exception table | |
2649 // to use new constant pool indices as needed. The exception table | |
2650 // holds quadruple entries of the form: | |
2651 // (beg_bci, end_bci, handler_bci, klass_index) | |
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2652 |
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2653 ExceptionTable ex_table(method()); |
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2654 int ext_length = ex_table.length(); |
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2655 |
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2656 for (int j = 0; j < ext_length; j ++) { |
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2657 int cur_index = ex_table.catch_type_index(j); |
0 | 2658 int new_index = find_new_index(cur_index); |
2659 if (new_index != 0) { | |
2660 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2661 ("ext-klass_index change: %d to %d", cur_index, new_index)); | |
6213
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2662 ex_table.set_catch_type_index(j, new_index); |
0 | 2663 } |
2664 } // end for each exception table entry | |
2665 | |
2666 // Update constant pool indices in the method's local variable | |
2667 // table to use new constant indices as needed. The local variable | |
2668 // table hold sextuple entries of the form: | |
2669 // (start_pc, length, name_index, descriptor_index, signature_index, slot) | |
2670 int lvt_length = method->localvariable_table_length(); | |
2671 if (lvt_length > 0) { | |
2672 LocalVariableTableElement * lv_table = | |
2673 method->localvariable_table_start(); | |
2674 for (int j = 0; j < lvt_length; j++) { | |
2675 int cur_index = lv_table[j].name_cp_index; | |
2676 int new_index = find_new_index(cur_index); | |
2677 if (new_index != 0) { | |
2678 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2679 ("lvt-name_cp_index change: %d to %d", cur_index, new_index)); | |
2680 lv_table[j].name_cp_index = (u2)new_index; | |
2681 } | |
2682 cur_index = lv_table[j].descriptor_cp_index; | |
2683 new_index = find_new_index(cur_index); | |
2684 if (new_index != 0) { | |
2685 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2686 ("lvt-descriptor_cp_index change: %d to %d", cur_index, | |
2687 new_index)); | |
2688 lv_table[j].descriptor_cp_index = (u2)new_index; | |
2689 } | |
2690 cur_index = lv_table[j].signature_cp_index; | |
2691 new_index = find_new_index(cur_index); | |
2692 if (new_index != 0) { | |
2693 RC_TRACE_WITH_THREAD(0x00080000, THREAD, | |
2694 ("lvt-signature_cp_index change: %d to %d", cur_index, new_index)); | |
2695 lv_table[j].signature_cp_index = (u2)new_index; | |
2696 } | |
2697 } // end for each local variable table entry | |
2698 } // end if there are local variable table entries | |
2699 | |
2700 rewrite_cp_refs_in_stack_map_table(method, THREAD); | |
2701 } // end for each method | |
2702 } // end set_new_constant_pool() | |
2703 | |
2704 | |
2705 // Unevolving classes may point to methods of the_class directly | |
2706 // from their constant pool caches, itables, and/or vtables. We | |
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2707 // use the ClassLoaderDataGraph::classes_do() facility and this helper |
0 | 2708 // to fix up these pointers. |
10268
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2709 |
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2710 // Adjust cpools and vtables closure |
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2711 void VM_RedefineClasses::AdjustCpoolCacheAndVtable::do_klass(Klass* k) { |
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2712 |
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2713 // This is a very busy routine. We don't want too much tracing |
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2714 // printed out. |
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2715 bool trace_name_printed = false; |
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2716 |
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2717 // Very noisy: only enable this call if you are trying to determine |
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2718 // that a specific class gets found by this routine. |
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2719 // RC_TRACE macro has an embedded ResourceMark |
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2720 // RC_TRACE_WITH_THREAD(0x00100000, THREAD, |
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2721 // ("adjust check: name=%s", k->external_name())); |
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2722 // trace_name_printed = true; |
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2723 |
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2724 // If the class being redefined is java.lang.Object, we need to fix all |
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2725 // array class vtables also |
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2726 if (k->oop_is_array() && _the_class_oop == SystemDictionary::Object_klass()) { |
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2727 k->vtable()->adjust_method_entries(_matching_old_methods, |
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2728 _matching_new_methods, |
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2729 _matching_methods_length, |
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2730 &trace_name_printed); |
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2731 } else if (k->oop_is_instance()) { |
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2732 HandleMark hm(_thread); |
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2733 InstanceKlass *ik = InstanceKlass::cast(k); |
0 | 2734 |
2735 // HotSpot specific optimization! HotSpot does not currently | |
2736 // support delegation from the bootstrap class loader to a | |
2737 // user-defined class loader. This means that if the bootstrap | |
2738 // class loader is the initiating class loader, then it will also | |
2739 // be the defining class loader. This also means that classes | |
2740 // loaded by the bootstrap class loader cannot refer to classes | |
2741 // loaded by a user-defined class loader. Note: a user-defined | |
2742 // class loader can delegate to the bootstrap class loader. | |
2743 // | |
2744 // If the current class being redefined has a user-defined class | |
2745 // loader as its defining class loader, then we can skip all | |
2746 // classes loaded by the bootstrap class loader. | |
2747 bool is_user_defined = | |
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2748 InstanceKlass::cast(_the_class_oop)->class_loader() != NULL; |
0 | 2749 if (is_user_defined && ik->class_loader() == NULL) { |
2750 return; | |
2751 } | |
2752 | |
2753 // Fix the vtable embedded in the_class and subclasses of the_class, | |
2754 // if one exists. We discard scratch_class and we don't keep an | |
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|
2755 // InstanceKlass around to hold obsolete methods so we don't have |
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2756 // any other InstanceKlass embedded vtables to update. The vtable |
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2757 // holds the Method*s for virtual (but not final) methods. |
12823
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8009130: Lambda: Fix access controls, loader constraints.
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|
2758 // Default methods, or concrete methods in interfaces are stored |
ac9cb1d5a202
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|
2759 // in the vtable, so if an interface changes we need to check |
ac9cb1d5a202
8009130: Lambda: Fix access controls, loader constraints.
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|
2760 // adjust_method_entries() for every InstanceKlass, which will also |
ac9cb1d5a202
8009130: Lambda: Fix access controls, loader constraints.
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|
2761 // adjust the default method vtable indices. |
ac9cb1d5a202
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|
2762 // We also need to adjust any default method entries that are |
ac9cb1d5a202
8009130: Lambda: Fix access controls, loader constraints.
acorn
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|
2763 // not yet in the vtable, because the vtable setup is in progress. |
ac9cb1d5a202
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2764 // This must be done after we adjust the default_methods and |
ac9cb1d5a202
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|
2765 // default_vtable_indices for methods already in the vtable. |
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|
2766 if (ik->vtable_length() > 0 && (_the_class_oop->is_interface() |
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2767 || ik->is_subtype_of(_the_class_oop))) { |
0 | 2768 // ik->vtable() creates a wrapper object; rm cleans it up |
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2769 ResourceMark rm(_thread); |
0 | 2770 ik->vtable()->adjust_method_entries(_matching_old_methods, |
2771 _matching_new_methods, | |
2772 _matching_methods_length, | |
2773 &trace_name_printed); | |
12823
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2774 ik->adjust_default_methods(_matching_old_methods, |
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|
2775 _matching_new_methods, |
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|
2776 _matching_methods_length, |
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|
2777 &trace_name_printed); |
0 | 2778 } |
2779 | |
2780 // If the current class has an itable and we are either redefining an | |
2781 // interface or if the current class is a subclass of the_class, then | |
2782 // we potentially have to fix the itable. If we are redefining an | |
2783 // interface, then we have to call adjust_method_entries() for | |
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2784 // every InstanceKlass that has an itable since there isn't a |
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2785 // subclass relationship between an interface and an InstanceKlass. |
6983 | 2786 if (ik->itable_length() > 0 && (_the_class_oop->is_interface() |
0 | 2787 || ik->is_subclass_of(_the_class_oop))) { |
2788 // ik->itable() creates a wrapper object; rm cleans it up | |
10268
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2789 ResourceMark rm(_thread); |
0 | 2790 ik->itable()->adjust_method_entries(_matching_old_methods, |
2791 _matching_new_methods, | |
2792 _matching_methods_length, | |
2793 &trace_name_printed); | |
2794 } | |
2795 | |
2796 // The constant pools in other classes (other_cp) can refer to | |
2797 // methods in the_class. We have to update method information in | |
2798 // other_cp's cache. If other_cp has a previous version, then we | |
2799 // have to repeat the process for each previous version. The | |
6725
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2800 // constant pool cache holds the Method*s for non-virtual |
0 | 2801 // methods and for virtual, final methods. |
2802 // | |
2803 // Special case: if the current class is the_class, then new_cp | |
2804 // has already been attached to the_class and old_cp has already | |
2805 // been added as a previous version. The new_cp doesn't have any | |
2806 // cached references to old methods so it doesn't need to be | |
2807 // updated. We can simply start with the previous version(s) in | |
2808 // that case. | |
2809 constantPoolHandle other_cp; | |
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2810 ConstantPoolCache* cp_cache; |
0 | 2811 |
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2812 if (ik != _the_class_oop) { |
0 | 2813 // this klass' constant pool cache may need adjustment |
2814 other_cp = constantPoolHandle(ik->constants()); | |
2815 cp_cache = other_cp->cache(); | |
2816 if (cp_cache != NULL) { | |
2817 cp_cache->adjust_method_entries(_matching_old_methods, | |
2818 _matching_new_methods, | |
2819 _matching_methods_length, | |
2820 &trace_name_printed); | |
2821 } | |
2822 } | |
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|
2823 |
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2824 // the previous versions' constant pool caches may need adjustment |
4f9a42c33738
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2825 PreviousVersionWalker pvw(_thread, ik); |
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2826 for (PreviousVersionNode * pv_node = pvw.next_previous_version(); |
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2827 pv_node != NULL; pv_node = pvw.next_previous_version()) { |
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coleenp
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|
2828 other_cp = pv_node->prev_constant_pool(); |
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2829 cp_cache = other_cp->cache(); |
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|
2830 if (cp_cache != NULL) { |
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|
2831 cp_cache->adjust_method_entries(_matching_old_methods, |
4f9a42c33738
8022887: Assertion hit while using class and redefining it with RedefineClasses simultaneously
coleenp
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|
2832 _matching_new_methods, |
4f9a42c33738
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coleenp
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|
2833 _matching_methods_length, |
4f9a42c33738
8022887: Assertion hit while using class and redefining it with RedefineClasses simultaneously
coleenp
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|
2834 &trace_name_printed); |
4f9a42c33738
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coleenp
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|
2835 } |
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|
2836 } |
0 | 2837 } |
2838 } | |
2839 | |
2840 void VM_RedefineClasses::update_jmethod_ids() { | |
2841 for (int j = 0; j < _matching_methods_length; ++j) { | |
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2842 Method* old_method = _matching_old_methods[j]; |
0 | 2843 jmethodID jmid = old_method->find_jmethod_id_or_null(); |
2844 if (jmid != NULL) { | |
2845 // There is a jmethodID, change it to point to the new method | |
2846 methodHandle new_method_h(_matching_new_methods[j]); | |
6725
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2847 Method::change_method_associated_with_jmethod_id(jmid, new_method_h()); |
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2848 assert(Method::resolve_jmethod_id(jmid) == _matching_new_methods[j], |
0 | 2849 "should be replaced"); |
2850 } | |
2851 } | |
2852 } | |
2853 | |
2854 void VM_RedefineClasses::check_methods_and_mark_as_obsolete( | |
2855 BitMap *emcp_methods, int * emcp_method_count_p) { | |
2856 *emcp_method_count_p = 0; | |
2857 int obsolete_count = 0; | |
2858 int old_index = 0; | |
2859 for (int j = 0; j < _matching_methods_length; ++j, ++old_index) { | |
6725
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2860 Method* old_method = _matching_old_methods[j]; |
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2861 Method* new_method = _matching_new_methods[j]; |
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2862 Method* old_array_method; |
0 | 2863 |
2864 // Maintain an old_index into the _old_methods array by skipping | |
2865 // deleted methods | |
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2866 while ((old_array_method = _old_methods->at(old_index)) != old_method) { |
0 | 2867 ++old_index; |
2868 } | |
2869 | |
2870 if (MethodComparator::methods_EMCP(old_method, new_method)) { | |
2871 // The EMCP definition from JSR-163 requires the bytecodes to be | |
2872 // the same with the exception of constant pool indices which may | |
2873 // differ. However, the constants referred to by those indices | |
2874 // must be the same. | |
2875 // | |
2876 // We use methods_EMCP() for comparison since constant pool | |
2877 // merging can remove duplicate constant pool entries that were | |
2878 // present in the old method and removed from the rewritten new | |
2879 // method. A faster binary comparison function would consider the | |
2880 // old and new methods to be different when they are actually | |
2881 // EMCP. | |
2882 // | |
2883 // The old and new methods are EMCP and you would think that we | |
2884 // could get rid of one of them here and now and save some space. | |
2885 // However, the concept of EMCP only considers the bytecodes and | |
2886 // the constant pool entries in the comparison. Other things, | |
2887 // e.g., the line number table (LNT) or the local variable table | |
2888 // (LVT) don't count in the comparison. So the new (and EMCP) | |
2889 // method can have a new LNT that we need so we can't just | |
2890 // overwrite the new method with the old method. | |
2891 // | |
2892 // When this routine is called, we have already attached the new | |
2893 // methods to the_class so the old methods are effectively | |
2894 // overwritten. However, if an old method is still executing, | |
2895 // then the old method cannot be collected until sometime after | |
2896 // the old method call has returned. So the overwriting of old | |
2897 // methods by new methods will save us space except for those | |
2898 // (hopefully few) old methods that are still executing. | |
2899 // | |
6725
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coleenp
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2900 // A method refers to a ConstMethod* and this presents another |
da91efe96a93
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|
2901 // possible avenue to space savings. The ConstMethod* in the |
0 | 2902 // new method contains possibly new attributes (LNT, LVT, etc). |
2903 // At first glance, it seems possible to save space by replacing | |
6725
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coleenp
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|
2904 // the ConstMethod* in the old method with the ConstMethod* |
0 | 2905 // from the new method. The old and new methods would share the |
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
2906 // same ConstMethod* and we would save the space occupied by |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
2907 // the old ConstMethod*. However, the ConstMethod* contains |
0 | 2908 // a back reference to the containing method. Sharing the |
6725
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|
2909 // ConstMethod* between two methods could lead to confusion in |
0 | 2910 // the code that uses the back reference. This would lead to |
2911 // brittle code that could be broken in non-obvious ways now or | |
2912 // in the future. | |
2913 // | |
6725
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2914 // Another possibility is to copy the ConstMethod* from the new |
0 | 2915 // method to the old method and then overwrite the new method with |
6725
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|
2916 // the old method. Since the ConstMethod* contains the bytecodes |
0 | 2917 // for the method embedded in the oop, this option would change |
2918 // the bytecodes out from under any threads executing the old | |
2919 // method and make the thread's bcp invalid. Since EMCP requires | |
2920 // that the bytecodes be the same modulo constant pool indices, it | |
2921 // is straight forward to compute the correct new bcp in the new | |
6725
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|
2922 // ConstMethod* from the old bcp in the old ConstMethod*. The |
0 | 2923 // time consuming part would be searching all the frames in all |
2924 // of the threads to find all of the calls to the old method. | |
2925 // | |
2926 // It looks like we will have to live with the limited savings | |
2927 // that we get from effectively overwriting the old methods | |
2928 // when the new methods are attached to the_class. | |
2929 | |
2930 // track which methods are EMCP for add_previous_version() call | |
2931 emcp_methods->set_bit(old_index); | |
2932 (*emcp_method_count_p)++; | |
2933 | |
2934 // An EMCP method is _not_ obsolete. An obsolete method has a | |
2935 // different jmethodID than the current method. An EMCP method | |
2936 // has the same jmethodID as the current method. Having the | |
2937 // same jmethodID for all EMCP versions of a method allows for | |
2938 // a consistent view of the EMCP methods regardless of which | |
2939 // EMCP method you happen to have in hand. For example, a | |
2940 // breakpoint set in one EMCP method will work for all EMCP | |
2941 // versions of the method including the current one. | |
2942 } else { | |
2943 // mark obsolete methods as such | |
2944 old_method->set_is_obsolete(); | |
2945 obsolete_count++; | |
2946 | |
12810
07f8c2a453f8
8025238: nsk/jvmti/scenarios/bcinstr/BI04/bi04t002 crashed with SIGSEGV
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12287
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|
2947 // obsolete methods need a unique idnum so they become new entries in |
07f8c2a453f8
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coleenp
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|
2948 // the jmethodID cache in InstanceKlass |
6725
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2949 u2 num = InstanceKlass::cast(_the_class_oop)->next_method_idnum(); |
da91efe96a93
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|
2950 if (num != ConstMethod::UNSET_IDNUM) { |
0 | 2951 old_method->set_method_idnum(num); |
2952 } | |
12281
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|
2953 |
0 | 2954 // With tracing we try not to "yack" too much. The position of |
2955 // this trace assumes there are fewer obsolete methods than | |
2956 // EMCP methods. | |
2957 RC_TRACE(0x00000100, ("mark %s(%s) as obsolete", | |
2958 old_method->name()->as_C_string(), | |
2959 old_method->signature()->as_C_string())); | |
2960 } | |
2961 old_method->set_is_old(); | |
2962 } | |
2963 for (int i = 0; i < _deleted_methods_length; ++i) { | |
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2964 Method* old_method = _deleted_methods[i]; |
0 | 2965 |
12264
b2e698d2276c
8014013: CallInfo structure no longer accurately reports the result of a LinkResolver operation
drchase
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12101
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|
2966 assert(!old_method->has_vtable_index(), |
0 | 2967 "cannot delete methods with vtable entries");; |
2968 | |
2969 // Mark all deleted methods as old and obsolete | |
2970 old_method->set_is_old(); | |
2971 old_method->set_is_obsolete(); | |
2972 ++obsolete_count; | |
2973 // With tracing we try not to "yack" too much. The position of | |
2974 // this trace assumes there are fewer obsolete methods than | |
2975 // EMCP methods. | |
2976 RC_TRACE(0x00000100, ("mark deleted %s(%s) as obsolete", | |
2977 old_method->name()->as_C_string(), | |
2978 old_method->signature()->as_C_string())); | |
2979 } | |
2980 assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(), | |
2981 "sanity check"); | |
2982 RC_TRACE(0x00000100, ("EMCP_cnt=%d, obsolete_cnt=%d", *emcp_method_count_p, | |
2983 obsolete_count)); | |
2984 } | |
2985 | |
2986 // This internal class transfers the native function registration from old methods | |
2987 // to new methods. It is designed to handle both the simple case of unchanged | |
2988 // native methods and the complex cases of native method prefixes being added and/or | |
2989 // removed. | |
2990 // It expects only to be used during the VM_RedefineClasses op (a safepoint). | |
2991 // | |
2992 // This class is used after the new methods have been installed in "the_class". | |
2993 // | |
2994 // So, for example, the following must be handled. Where 'm' is a method and | |
2995 // a number followed by an underscore is a prefix. | |
2996 // | |
2997 // Old Name New Name | |
2998 // Simple transfer to new method m -> m | |
2999 // Add prefix m -> 1_m | |
3000 // Remove prefix 1_m -> m | |
3001 // Simultaneous add of prefixes m -> 3_2_1_m | |
3002 // Simultaneous removal of prefixes 3_2_1_m -> m | |
3003 // Simultaneous add and remove 1_m -> 2_m | |
3004 // Same, caused by prefix removal only 3_2_1_m -> 3_2_m | |
3005 // | |
3006 class TransferNativeFunctionRegistration { | |
3007 private: | |
3008 instanceKlassHandle the_class; | |
3009 int prefix_count; | |
3010 char** prefixes; | |
3011 | |
3012 // Recursively search the binary tree of possibly prefixed method names. | |
3013 // Iteration could be used if all agents were well behaved. Full tree walk is | |
3014 // more resilent to agents not cleaning up intermediate methods. | |
3015 // Branch at each depth in the binary tree is: | |
3016 // (1) without the prefix. | |
3017 // (2) with the prefix. | |
3018 // where 'prefix' is the prefix at that 'depth' (first prefix, second prefix,...) | |
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3019 Method* search_prefix_name_space(int depth, char* name_str, size_t name_len, |
2177
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3020 Symbol* signature) { |
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|
3021 TempNewSymbol name_symbol = SymbolTable::probe(name_str, (int)name_len); |
0 | 3022 if (name_symbol != NULL) { |
6983 | 3023 Method* method = the_class()->lookup_method(name_symbol, signature); |
0 | 3024 if (method != NULL) { |
3025 // Even if prefixed, intermediate methods must exist. | |
3026 if (method->is_native()) { | |
3027 // Wahoo, we found a (possibly prefixed) version of the method, return it. | |
3028 return method; | |
3029 } | |
3030 if (depth < prefix_count) { | |
3031 // Try applying further prefixes (other than this one). | |
3032 method = search_prefix_name_space(depth+1, name_str, name_len, signature); | |
3033 if (method != NULL) { | |
3034 return method; // found | |
3035 } | |
3036 | |
3037 // Try adding this prefix to the method name and see if it matches | |
3038 // another method name. | |
3039 char* prefix = prefixes[depth]; | |
3040 size_t prefix_len = strlen(prefix); | |
3041 size_t trial_len = name_len + prefix_len; | |
3042 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); | |
3043 strcpy(trial_name_str, prefix); | |
3044 strcat(trial_name_str, name_str); | |
3045 method = search_prefix_name_space(depth+1, trial_name_str, trial_len, | |
3046 signature); | |
3047 if (method != NULL) { | |
3048 // If found along this branch, it was prefixed, mark as such | |
3049 method->set_is_prefixed_native(); | |
3050 return method; // found | |
3051 } | |
3052 } | |
3053 } | |
3054 } | |
3055 return NULL; // This whole branch bore nothing | |
3056 } | |
3057 | |
3058 // Return the method name with old prefixes stripped away. | |
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3059 char* method_name_without_prefixes(Method* method) { |
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3060 Symbol* name = method->name(); |
0 | 3061 char* name_str = name->as_utf8(); |
3062 | |
3063 // Old prefixing may be defunct, strip prefixes, if any. | |
3064 for (int i = prefix_count-1; i >= 0; i--) { | |
3065 char* prefix = prefixes[i]; | |
3066 size_t prefix_len = strlen(prefix); | |
3067 if (strncmp(prefix, name_str, prefix_len) == 0) { | |
3068 name_str += prefix_len; | |
3069 } | |
3070 } | |
3071 return name_str; | |
3072 } | |
3073 | |
3074 // Strip any prefixes off the old native method, then try to find a | |
3075 // (possibly prefixed) new native that matches it. | |
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3076 Method* strip_and_search_for_new_native(Method* method) { |
0 | 3077 ResourceMark rm; |
3078 char* name_str = method_name_without_prefixes(method); | |
3079 return search_prefix_name_space(0, name_str, strlen(name_str), | |
3080 method->signature()); | |
3081 } | |
3082 | |
3083 public: | |
3084 | |
3085 // Construct a native method transfer processor for this class. | |
3086 TransferNativeFunctionRegistration(instanceKlassHandle _the_class) { | |
3087 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); | |
3088 | |
3089 the_class = _the_class; | |
3090 prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); | |
3091 } | |
3092 | |
3093 // Attempt to transfer any of the old or deleted methods that are native | |
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3094 void transfer_registrations(Method** old_methods, int methods_length) { |
0 | 3095 for (int j = 0; j < methods_length; j++) { |
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3096 Method* old_method = old_methods[j]; |
0 | 3097 |
3098 if (old_method->is_native() && old_method->has_native_function()) { | |
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3099 Method* new_method = strip_and_search_for_new_native(old_method); |
0 | 3100 if (new_method != NULL) { |
3101 // Actually set the native function in the new method. | |
3102 // Redefine does not send events (except CFLH), certainly not this | |
3103 // behind the scenes re-registration. | |
3104 new_method->set_native_function(old_method->native_function(), | |
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3105 !Method::native_bind_event_is_interesting); |
0 | 3106 } |
3107 } | |
3108 } | |
3109 } | |
3110 }; | |
3111 | |
3112 // Don't lose the association between a native method and its JNI function. | |
3113 void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle the_class) { | |
3114 TransferNativeFunctionRegistration transfer(the_class); | |
3115 transfer.transfer_registrations(_deleted_methods, _deleted_methods_length); | |
3116 transfer.transfer_registrations(_matching_old_methods, _matching_methods_length); | |
3117 } | |
3118 | |
3119 // Deoptimize all compiled code that depends on this class. | |
3120 // | |
3121 // If the can_redefine_classes capability is obtained in the onload | |
3122 // phase then the compiler has recorded all dependencies from startup. | |
3123 // In that case we need only deoptimize and throw away all compiled code | |
3124 // that depends on the class. | |
3125 // | |
3126 // If can_redefine_classes is obtained sometime after the onload | |
3127 // phase then the dependency information may be incomplete. In that case | |
3128 // the first call to RedefineClasses causes all compiled code to be | |
3129 // thrown away. As can_redefine_classes has been obtained then | |
3130 // all future compilations will record dependencies so second and | |
3131 // subsequent calls to RedefineClasses need only throw away code | |
3132 // that depends on the class. | |
3133 // | |
3134 void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) { | |
3135 assert_locked_or_safepoint(Compile_lock); | |
3136 | |
3137 // All dependencies have been recorded from startup or this is a second or | |
3138 // subsequent use of RedefineClasses | |
3139 if (JvmtiExport::all_dependencies_are_recorded()) { | |
3140 Universe::flush_evol_dependents_on(k_h); | |
3141 } else { | |
3142 CodeCache::mark_all_nmethods_for_deoptimization(); | |
3143 | |
3144 ResourceMark rm(THREAD); | |
3145 DeoptimizationMarker dm; | |
3146 | |
3147 // Deoptimize all activations depending on marked nmethods | |
3148 Deoptimization::deoptimize_dependents(); | |
3149 | |
3150 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
3151 CodeCache::make_marked_nmethods_not_entrant(); | |
3152 | |
3153 // From now on we know that the dependency information is complete | |
3154 JvmtiExport::set_all_dependencies_are_recorded(true); | |
3155 } | |
3156 } | |
3157 | |
3158 void VM_RedefineClasses::compute_added_deleted_matching_methods() { | |
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3159 Method* old_method; |
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3160 Method* new_method; |
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3161 |
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3162 _matching_old_methods = NEW_RESOURCE_ARRAY(Method*, _old_methods->length()); |
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3163 _matching_new_methods = NEW_RESOURCE_ARRAY(Method*, _old_methods->length()); |
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3164 _added_methods = NEW_RESOURCE_ARRAY(Method*, _new_methods->length()); |
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3165 _deleted_methods = NEW_RESOURCE_ARRAY(Method*, _old_methods->length()); |
0 | 3166 |
3167 _matching_methods_length = 0; | |
3168 _deleted_methods_length = 0; | |
3169 _added_methods_length = 0; | |
3170 | |
3171 int nj = 0; | |
3172 int oj = 0; | |
3173 while (true) { | |
3174 if (oj >= _old_methods->length()) { | |
3175 if (nj >= _new_methods->length()) { | |
3176 break; // we've looked at everything, done | |
3177 } | |
3178 // New method at the end | |
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3179 new_method = _new_methods->at(nj); |
0 | 3180 _added_methods[_added_methods_length++] = new_method; |
3181 ++nj; | |
3182 } else if (nj >= _new_methods->length()) { | |
3183 // Old method, at the end, is deleted | |
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3184 old_method = _old_methods->at(oj); |
0 | 3185 _deleted_methods[_deleted_methods_length++] = old_method; |
3186 ++oj; | |
3187 } else { | |
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3188 old_method = _old_methods->at(oj); |
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3189 new_method = _new_methods->at(nj); |
0 | 3190 if (old_method->name() == new_method->name()) { |
3191 if (old_method->signature() == new_method->signature()) { | |
3192 _matching_old_methods[_matching_methods_length ] = old_method; | |
3193 _matching_new_methods[_matching_methods_length++] = new_method; | |
3194 ++nj; | |
3195 ++oj; | |
3196 } else { | |
3197 // added overloaded have already been moved to the end, | |
3198 // so this is a deleted overloaded method | |
3199 _deleted_methods[_deleted_methods_length++] = old_method; | |
3200 ++oj; | |
3201 } | |
3202 } else { // names don't match | |
3203 if (old_method->name()->fast_compare(new_method->name()) > 0) { | |
3204 // new method | |
3205 _added_methods[_added_methods_length++] = new_method; | |
3206 ++nj; | |
3207 } else { | |
3208 // deleted method | |
3209 _deleted_methods[_deleted_methods_length++] = old_method; | |
3210 ++oj; | |
3211 } | |
3212 } | |
3213 } | |
3214 } | |
3215 assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity"); | |
3216 assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity"); | |
3217 } | |
3218 | |
3219 | |
8031 | 3220 void VM_RedefineClasses::swap_annotations(instanceKlassHandle the_class, |
3221 instanceKlassHandle scratch_class) { | |
3222 // Since there is currently no rewriting of type annotations indexes | |
3223 // into the CP, we null out type annotations on scratch_class before | |
3224 // we swap annotations with the_class rather than facing the | |
3225 // possibility of shipping annotations with broken indexes to | |
3226 // Java-land. | |
3227 ClassLoaderData* loader_data = scratch_class->class_loader_data(); | |
3228 AnnotationArray* new_class_type_annotations = scratch_class->class_type_annotations(); | |
3229 if (new_class_type_annotations != NULL) { | |
3230 MetadataFactory::free_array<u1>(loader_data, new_class_type_annotations); | |
3231 scratch_class->annotations()->set_class_type_annotations(NULL); | |
3232 } | |
3233 Array<AnnotationArray*>* new_field_type_annotations = scratch_class->fields_type_annotations(); | |
3234 if (new_field_type_annotations != NULL) { | |
3235 Annotations::free_contents(loader_data, new_field_type_annotations); | |
3236 scratch_class->annotations()->set_fields_type_annotations(NULL); | |
3237 } | |
3238 | |
3239 // Swap annotation fields values | |
3240 Annotations* old_annotations = the_class->annotations(); | |
3241 the_class->set_annotations(scratch_class->annotations()); | |
3242 scratch_class->set_annotations(old_annotations); | |
3243 } | |
3244 | |
0 | 3245 |
3246 // Install the redefinition of a class: | |
3247 // - house keeping (flushing breakpoints and caches, deoptimizing | |
3248 // dependent compiled code) | |
3249 // - replacing parts in the_class with parts from scratch_class | |
3250 // - adding a weak reference to track the obsolete but interesting | |
3251 // parts of the_class | |
3252 // - adjusting constant pool caches and vtables in other classes | |
3253 // that refer to methods in the_class. These adjustments use the | |
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3254 // ClassLoaderDataGraph::classes_do() facility which only allows |
0 | 3255 // a helper method to be specified. The interesting parameters |
3256 // that we would like to pass to the helper method are saved in | |
3257 // static global fields in the VM operation. | |
3258 void VM_RedefineClasses::redefine_single_class(jclass the_jclass, | |
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3259 Klass* scratch_class_oop, TRAPS) { |
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3260 |
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3261 HandleMark hm(THREAD); // make sure handles from this call are freed |
0 | 3262 RC_TIMER_START(_timer_rsc_phase1); |
3263 | |
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3264 instanceKlassHandle scratch_class(scratch_class_oop); |
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3265 |
0 | 3266 oop the_class_mirror = JNIHandles::resolve_non_null(the_jclass); |
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3267 Klass* the_class_oop = java_lang_Class::as_Klass(the_class_mirror); |
0 | 3268 instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop); |
3269 | |
3270 // Remove all breakpoints in methods of this class | |
3271 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); | |
3272 jvmti_breakpoints.clearall_in_class_at_safepoint(the_class_oop); | |
3273 | |
3274 // Deoptimize all compiled code that depends on this class | |
3275 flush_dependent_code(the_class, THREAD); | |
3276 | |
3277 _old_methods = the_class->methods(); | |
3278 _new_methods = scratch_class->methods(); | |
3279 _the_class_oop = the_class_oop; | |
3280 compute_added_deleted_matching_methods(); | |
3281 update_jmethod_ids(); | |
3282 | |
3283 // Attach new constant pool to the original klass. The original | |
3284 // klass still refers to the old constant pool (for now). | |
3285 scratch_class->constants()->set_pool_holder(the_class()); | |
3286 | |
3287 #if 0 | |
3288 // In theory, with constant pool merging in place we should be able | |
3289 // to save space by using the new, merged constant pool in place of | |
3290 // the old constant pool(s). By "pool(s)" I mean the constant pool in | |
3291 // the klass version we are replacing now and any constant pool(s) in | |
3292 // previous versions of klass. Nice theory, doesn't work in practice. | |
3293 // When this code is enabled, even simple programs throw NullPointer | |
3294 // exceptions. I'm guessing that this is caused by some constant pool | |
3295 // cache difference between the new, merged constant pool and the | |
3296 // constant pool that was just being used by the klass. I'm keeping | |
3297 // this code around to archive the idea, but the code has to remain | |
3298 // disabled for now. | |
3299 | |
3300 // Attach each old method to the new constant pool. This can be | |
3301 // done here since we are past the bytecode verification and | |
3302 // constant pool optimization phases. | |
3303 for (int i = _old_methods->length() - 1; i >= 0; i--) { | |
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3304 Method* method = _old_methods->at(i); |
0 | 3305 method->set_constants(scratch_class->constants()); |
3306 } | |
3307 | |
3308 { | |
3309 // walk all previous versions of the klass | |
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3310 InstanceKlass *ik = (InstanceKlass *)the_class(); |
0 | 3311 PreviousVersionWalker pvw(ik); |
3312 instanceKlassHandle ikh; | |
3313 do { | |
3314 ikh = pvw.next_previous_version(); | |
3315 if (!ikh.is_null()) { | |
3316 ik = ikh(); | |
3317 | |
3318 // attach previous version of klass to the new constant pool | |
3319 ik->set_constants(scratch_class->constants()); | |
3320 | |
3321 // Attach each method in the previous version of klass to the | |
3322 // new constant pool | |
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3323 Array<Method*>* prev_methods = ik->methods(); |
0 | 3324 for (int i = prev_methods->length() - 1; i >= 0; i--) { |
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3325 Method* method = prev_methods->at(i); |
0 | 3326 method->set_constants(scratch_class->constants()); |
3327 } | |
3328 } | |
3329 } while (!ikh.is_null()); | |
3330 } | |
3331 #endif | |
3332 | |
3333 // Replace methods and constantpool | |
3334 the_class->set_methods(_new_methods); | |
3335 scratch_class->set_methods(_old_methods); // To prevent potential GCing of the old methods, | |
3336 // and to be able to undo operation easily. | |
3337 | |
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3338 ConstantPool* old_constants = the_class->constants(); |
0 | 3339 the_class->set_constants(scratch_class->constants()); |
3340 scratch_class->set_constants(old_constants); // See the previous comment. | |
3341 #if 0 | |
3342 // We are swapping the guts of "the new class" with the guts of "the | |
3343 // class". Since the old constant pool has just been attached to "the | |
3344 // new class", it seems logical to set the pool holder in the old | |
3345 // constant pool also. However, doing this will change the observable | |
3346 // class hierarchy for any old methods that are still executing. A | |
3347 // method can query the identity of its "holder" and this query uses | |
3348 // the method's constant pool link to find the holder. The change in | |
3349 // holding class from "the class" to "the new class" can confuse | |
3350 // things. | |
3351 // | |
3352 // Setting the old constant pool's holder will also cause | |
3353 // verification done during vtable initialization below to fail. | |
3354 // During vtable initialization, the vtable's class is verified to be | |
3355 // a subtype of the method's holder. The vtable's class is "the | |
3356 // class" and the method's holder is gotten from the constant pool | |
3357 // link in the method itself. For "the class"'s directly implemented | |
3358 // methods, the method holder is "the class" itself (as gotten from | |
3359 // the new constant pool). The check works fine in this case. The | |
3360 // check also works fine for methods inherited from super classes. | |
3361 // | |
3362 // Miranda methods are a little more complicated. A miranda method is | |
3363 // provided by an interface when the class implementing the interface | |
3364 // does not provide its own method. These interfaces are implemented | |
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3365 // internally as an InstanceKlass. These special instanceKlasses |
0 | 3366 // share the constant pool of the class that "implements" the |
3367 // interface. By sharing the constant pool, the method holder of a | |
3368 // miranda method is the class that "implements" the interface. In a | |
3369 // non-redefine situation, the subtype check works fine. However, if | |
3370 // the old constant pool's pool holder is modified, then the check | |
3371 // fails because there is no class hierarchy relationship between the | |
3372 // vtable's class and "the new class". | |
3373 | |
3374 old_constants->set_pool_holder(scratch_class()); | |
3375 #endif | |
3376 | |
3377 // track which methods are EMCP for add_previous_version() call below | |
3378 BitMap emcp_methods(_old_methods->length()); | |
3379 int emcp_method_count = 0; | |
3380 emcp_methods.clear(); // clears 0..(length() - 1) | |
3381 check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count); | |
3382 transfer_old_native_function_registrations(the_class); | |
3383 | |
3384 // The class file bytes from before any retransformable agents mucked | |
3385 // with them was cached on the scratch class, move to the_class. | |
3386 // Note: we still want to do this if nothing needed caching since it | |
3387 // should get cleared in the_class too. | |
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3388 if (the_class->get_cached_class_file_bytes() == 0) { |
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3389 // the_class doesn't have a cache yet so copy it |
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3390 the_class->set_cached_class_file(scratch_class->get_cached_class_file()); |
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3391 } |
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3392 #ifndef PRODUCT |
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3393 else { |
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3394 assert(the_class->get_cached_class_file_bytes() == |
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3395 scratch_class->get_cached_class_file_bytes(), "cache ptrs must match"); |
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3396 assert(the_class->get_cached_class_file_len() == |
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3397 scratch_class->get_cached_class_file_len(), "cache lens must match"); |
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3398 } |
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3399 #endif |
0 | 3400 |
10252
712a1e9c91f3
8013063: nsk/jvmti/RetransformClasses/retransform001 failed debug version on os::free
coleenp
parents:
10151
diff
changeset
|
3401 // NULL out in scratch class to not delete twice. The class to be redefined |
712a1e9c91f3
8013063: nsk/jvmti/RetransformClasses/retransform001 failed debug version on os::free
coleenp
parents:
10151
diff
changeset
|
3402 // always owns these bytes. |
11148
825e6cb66923
8020309: Eliminate InstanceKlass::_cached_class_file_len.
jiangli
parents:
10382
diff
changeset
|
3403 scratch_class->set_cached_class_file(NULL); |
10252
712a1e9c91f3
8013063: nsk/jvmti/RetransformClasses/retransform001 failed debug version on os::free
coleenp
parents:
10151
diff
changeset
|
3404 |
0 | 3405 // Replace inner_classes |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3406 Array<u2>* old_inner_classes = the_class->inner_classes(); |
0 | 3407 the_class->set_inner_classes(scratch_class->inner_classes()); |
3408 scratch_class->set_inner_classes(old_inner_classes); | |
3409 | |
3410 // Initialize the vtable and interface table after | |
3411 // methods have been rewritten | |
3412 { | |
3413 ResourceMark rm(THREAD); | |
3414 // no exception should happen here since we explicitly | |
3415 // do not check loader constraints. | |
3416 // compare_and_normalize_class_versions has already checked: | |
3417 // - classloaders unchanged, signatures unchanged | |
3418 // - all instanceKlasses for redefined classes reused & contents updated | |
3419 the_class->vtable()->initialize_vtable(false, THREAD); | |
3420 the_class->itable()->initialize_itable(false, THREAD); | |
1142 | 3421 assert(!HAS_PENDING_EXCEPTION || (THREAD->pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())), "redefine exception"); |
0 | 3422 } |
3423 | |
3424 // Leave arrays of jmethodIDs and itable index cache unchanged | |
3425 | |
3426 // Copy the "source file name" attribute from new class version | |
12067
e22ee8e7ae62
8021948: Change InstanceKlass::_source_file_name and _generic_signature from Symbol* to constant pool indexes.
jiangli
parents:
12022
diff
changeset
|
3427 the_class->set_source_file_name_index( |
e22ee8e7ae62
8021948: Change InstanceKlass::_source_file_name and _generic_signature from Symbol* to constant pool indexes.
jiangli
parents:
12022
diff
changeset
|
3428 scratch_class->source_file_name_index()); |
0 | 3429 |
3430 // Copy the "source debug extension" attribute from new class version | |
3431 the_class->set_source_debug_extension( | |
6203
04ade88d9712
6294277: java -Xdebug crashes on SourceDebugExtension attribute larger than 64K
fparain
parents:
6197
diff
changeset
|
3432 scratch_class->source_debug_extension(), |
04ade88d9712
6294277: java -Xdebug crashes on SourceDebugExtension attribute larger than 64K
fparain
parents:
6197
diff
changeset
|
3433 scratch_class->source_debug_extension() == NULL ? 0 : |
04ade88d9712
6294277: java -Xdebug crashes on SourceDebugExtension attribute larger than 64K
fparain
parents:
6197
diff
changeset
|
3434 (int)strlen(scratch_class->source_debug_extension())); |
0 | 3435 |
3436 // Use of javac -g could be different in the old and the new | |
3437 if (scratch_class->access_flags().has_localvariable_table() != | |
3438 the_class->access_flags().has_localvariable_table()) { | |
3439 | |
3440 AccessFlags flags = the_class->access_flags(); | |
3441 if (scratch_class->access_flags().has_localvariable_table()) { | |
3442 flags.set_has_localvariable_table(); | |
3443 } else { | |
3444 flags.clear_has_localvariable_table(); | |
3445 } | |
3446 the_class->set_access_flags(flags); | |
3447 } | |
3448 | |
8031 | 3449 swap_annotations(the_class, scratch_class); |
0 | 3450 |
3451 // Replace minor version number of class file | |
3452 u2 old_minor_version = the_class->minor_version(); | |
3453 the_class->set_minor_version(scratch_class->minor_version()); | |
3454 scratch_class->set_minor_version(old_minor_version); | |
3455 | |
3456 // Replace major version number of class file | |
3457 u2 old_major_version = the_class->major_version(); | |
3458 the_class->set_major_version(scratch_class->major_version()); | |
3459 scratch_class->set_major_version(old_major_version); | |
3460 | |
3461 // Replace CP indexes for class and name+type of enclosing method | |
3462 u2 old_class_idx = the_class->enclosing_method_class_index(); | |
3463 u2 old_method_idx = the_class->enclosing_method_method_index(); | |
3464 the_class->set_enclosing_method_indices( | |
3465 scratch_class->enclosing_method_class_index(), | |
3466 scratch_class->enclosing_method_method_index()); | |
3467 scratch_class->set_enclosing_method_indices(old_class_idx, old_method_idx); | |
3468 | |
3469 // keep track of previous versions of this class | |
3470 the_class->add_previous_version(scratch_class, &emcp_methods, | |
3471 emcp_method_count); | |
3472 | |
3473 RC_TIMER_STOP(_timer_rsc_phase1); | |
3474 RC_TIMER_START(_timer_rsc_phase2); | |
3475 | |
3476 // Adjust constantpool caches and vtables for all classes | |
3477 // that reference methods of the evolved class. | |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3478 AdjustCpoolCacheAndVtable adjust_cpool_cache_and_vtable(THREAD); |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3479 ClassLoaderDataGraph::classes_do(&adjust_cpool_cache_and_vtable); |
0 | 3480 |
10133
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3481 // JSR-292 support |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3482 MemberNameTable* mnt = the_class->member_names(); |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3483 if (mnt != NULL) { |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3484 bool trace_name_printed = false; |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3485 mnt->adjust_method_entries(_matching_old_methods, |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3486 _matching_new_methods, |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3487 _matching_methods_length, |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3488 &trace_name_printed); |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3489 } |
6337ca4dcad8
8008511: JSR 292: MemberName vmtarget refs to methods must be updated at class redefinition
sspitsyn
parents:
8068
diff
changeset
|
3490 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3491 // Fix Resolution Error table also to remove old constant pools |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3492 SystemDictionary::delete_resolution_error(old_constants); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3493 |
0 | 3494 if (the_class->oop_map_cache() != NULL) { |
3495 // Flush references to any obsolete methods from the oop map cache | |
3496 // so that obsolete methods are not pinned. | |
3497 the_class->oop_map_cache()->flush_obsolete_entries(); | |
3498 } | |
3499 | |
3500 // increment the classRedefinedCount field in the_class and in any | |
3501 // direct and indirect subclasses of the_class | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3502 increment_class_counter((InstanceKlass *)the_class(), THREAD); |
0 | 3503 |
3504 // RC_TRACE macro has an embedded ResourceMark | |
3505 RC_TRACE_WITH_THREAD(0x00000001, THREAD, | |
3506 ("redefined name=%s, count=%d (avail_mem=" UINT64_FORMAT "K)", | |
3507 the_class->external_name(), | |
3508 java_lang_Class::classRedefinedCount(the_class_mirror), | |
3509 os::available_memory() >> 10)); | |
3510 | |
3511 RC_TIMER_STOP(_timer_rsc_phase2); | |
3512 } // end redefine_single_class() | |
3513 | |
3514 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3515 // Increment the classRedefinedCount field in the specific InstanceKlass |
0 | 3516 // and in all direct and indirect subclasses. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3517 void VM_RedefineClasses::increment_class_counter(InstanceKlass *ik, TRAPS) { |
0 | 3518 oop class_mirror = ik->java_mirror(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3519 Klass* class_oop = java_lang_Class::as_Klass(class_mirror); |
0 | 3520 int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1; |
3521 java_lang_Class::set_classRedefinedCount(class_mirror, new_count); | |
3522 | |
3523 if (class_oop != _the_class_oop) { | |
3524 // _the_class_oop count is printed at end of redefine_single_class() | |
3525 RC_TRACE_WITH_THREAD(0x00000008, THREAD, | |
3526 ("updated count in subclass=%s to %d", ik->external_name(), new_count)); | |
3527 } | |
3528 | |
3529 for (Klass *subk = ik->subklass(); subk != NULL; | |
3530 subk = subk->next_sibling()) { | |
2377
57552dca1708
7029509: nightly failures after static fields in Class
never
parents:
2332
diff
changeset
|
3531 if (subk->oop_is_instance()) { |
57552dca1708
7029509: nightly failures after static fields in Class
never
parents:
2332
diff
changeset
|
3532 // Only update instanceKlasses |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3533 InstanceKlass *subik = (InstanceKlass*)subk; |
2377
57552dca1708
7029509: nightly failures after static fields in Class
never
parents:
2332
diff
changeset
|
3534 // recursively do subclasses of the current subclass |
57552dca1708
7029509: nightly failures after static fields in Class
never
parents:
2332
diff
changeset
|
3535 increment_class_counter(subik, THREAD); |
57552dca1708
7029509: nightly failures after static fields in Class
never
parents:
2332
diff
changeset
|
3536 } |
0 | 3537 } |
3538 } | |
3539 | |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3540 void VM_RedefineClasses::CheckClass::do_klass(Klass* k) { |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3541 bool no_old_methods = true; // be optimistic |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3542 |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3543 // Both array and instance classes have vtables. |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3544 // a vtable should never contain old or obsolete methods |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3545 ResourceMark rm(_thread); |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3546 if (k->vtable_length() > 0 && |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3547 !k->vtable()->check_no_old_or_obsolete_entries()) { |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3548 if (RC_TRACE_ENABLED(0x00004000)) { |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3549 RC_TRACE_WITH_THREAD(0x00004000, _thread, |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3550 ("klassVtable::check_no_old_or_obsolete_entries failure" |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3551 " -- OLD or OBSOLETE method found -- class: %s", |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3552 k->signature_name())); |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3553 k->vtable()->dump_vtable(); |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3554 } |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3555 no_old_methods = false; |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3556 } |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3557 |
0 | 3558 if (k->oop_is_instance()) { |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3559 HandleMark hm(_thread); |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3560 InstanceKlass *ik = InstanceKlass::cast(k); |
8021
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3561 |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3562 // an itable should never contain old or obsolete methods |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3563 if (ik->itable_length() > 0 && |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3564 !ik->itable()->check_no_old_or_obsolete_entries()) { |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3565 if (RC_TRACE_ENABLED(0x00004000)) { |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3566 RC_TRACE_WITH_THREAD(0x00004000, _thread, |
8021
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3567 ("klassItable::check_no_old_or_obsolete_entries failure" |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3568 " -- OLD or OBSOLETE method found -- class: %s", |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3569 ik->signature_name())); |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3570 ik->itable()->dump_itable(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3571 } |
8021
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3572 no_old_methods = false; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3573 } |
8021
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3574 |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3575 // the constant pool cache should never contain old or obsolete methods |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3576 if (ik->constants() != NULL && |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3577 ik->constants()->cache() != NULL && |
8021
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3578 !ik->constants()->cache()->check_no_old_or_obsolete_entries()) { |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3579 if (RC_TRACE_ENABLED(0x00004000)) { |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3580 RC_TRACE_WITH_THREAD(0x00004000, _thread, |
8021
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3581 ("cp-cache::check_no_old_or_obsolete_entries failure" |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3582 " -- OLD or OBSOLETE method found -- class: %s", |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3583 ik->signature_name())); |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3584 ik->constants()->cache()->dump_cache(); |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3585 } |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3586 no_old_methods = false; |
8d9fc28831cc
7182152: Instrumentation hot swap test incorrect monitor count
dcubed
parents:
7965
diff
changeset
|
3587 } |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3588 } |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3589 |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3590 // print and fail guarantee if old methods are found. |
43083e670adf
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coleenp
parents:
10252
diff
changeset
|
3591 if (!no_old_methods) { |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3592 if (RC_TRACE_ENABLED(0x00004000)) { |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3593 dump_methods(); |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3594 } else { |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3595 tty->print_cr("INFO: use the '-XX:TraceRedefineClasses=16384' option " |
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3596 "to see more info about the following guarantee() failure."); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6217
diff
changeset
|
3597 } |
10268
43083e670adf
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coleenp
parents:
10252
diff
changeset
|
3598 guarantee(false, "OLD and/or OBSOLETE method(s) found"); |
0 | 3599 } |
3600 } | |
3601 | |
10268
43083e670adf
8005056: NPG: Crash after redefining java.lang.Object
coleenp
parents:
10252
diff
changeset
|
3602 |
0 | 3603 void VM_RedefineClasses::dump_methods() { |
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3604 int j; |
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3605 RC_TRACE(0x00004000, ("_old_methods --")); |
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3606 for (j = 0; j < _old_methods->length(); ++j) { |
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3607 Method* m = _old_methods->at(j); |
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3608 RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index())); |
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3609 m->access_flags().print_on(tty); |
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3610 tty->print(" -- "); |
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3611 m->print_name(tty); |
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3612 tty->cr(); |
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3613 } |
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3614 RC_TRACE(0x00004000, ("_new_methods --")); |
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3615 for (j = 0; j < _new_methods->length(); ++j) { |
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3616 Method* m = _new_methods->at(j); |
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3617 RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index())); |
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3618 m->access_flags().print_on(tty); |
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3619 tty->print(" -- "); |
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3620 m->print_name(tty); |
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3621 tty->cr(); |
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3622 } |
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3623 RC_TRACE(0x00004000, ("_matching_(old/new)_methods --")); |
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3624 for (j = 0; j < _matching_methods_length; ++j) { |
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3625 Method* m = _matching_old_methods[j]; |
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3626 RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index())); |
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3627 m->access_flags().print_on(tty); |
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3628 tty->print(" -- "); |
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3629 m->print_name(tty); |
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3630 tty->cr(); |
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3631 m = _matching_new_methods[j]; |
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3632 RC_TRACE_NO_CR(0x00004000, (" (%5d) ", m->vtable_index())); |
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3633 m->access_flags().print_on(tty); |
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3634 tty->cr(); |
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3635 } |
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3636 RC_TRACE(0x00004000, ("_deleted_methods --")); |
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3637 for (j = 0; j < _deleted_methods_length; ++j) { |
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3638 Method* m = _deleted_methods[j]; |
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3639 RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index())); |
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3640 m->access_flags().print_on(tty); |
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3641 tty->print(" -- "); |
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3642 m->print_name(tty); |
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3643 tty->cr(); |
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3644 } |
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3645 RC_TRACE(0x00004000, ("_added_methods --")); |
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3646 for (j = 0; j < _added_methods_length; ++j) { |
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3647 Method* m = _added_methods[j]; |
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3648 RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index())); |
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3649 m->access_flags().print_on(tty); |
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3650 tty->print(" -- "); |
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3651 m->print_name(tty); |
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3652 tty->cr(); |
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3653 } |
0 | 3654 } |