Mon, 25 Jun 2012 21:33:35 -0400
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
Summary: Cannot delete _buckets and HashtableEntries in shared space (CDS)
Reviewed-by: acorn, kvn, dlong, dcubed, kamg
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/verificationType.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPoolOop.hpp"
39 #include "oops/fieldStreams.hpp"
40 #include "oops/instanceKlass.hpp"
41 #include "oops/instanceMirrorKlass.hpp"
42 #include "oops/klass.inline.hpp"
43 #include "oops/klassOop.hpp"
44 #include "oops/klassVtable.hpp"
45 #include "oops/methodOop.hpp"
46 #include "oops/symbol.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "prims/jvmtiThreadState.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/perfData.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/timer.hpp"
54 #include "services/classLoadingService.hpp"
55 #include "services/threadService.hpp"
57 // We generally try to create the oops directly when parsing, rather than
58 // allocating temporary data structures and copying the bytes twice. A
59 // temporary area is only needed when parsing utf8 entries in the constant
60 // pool and when parsing line number tables.
62 // We add assert in debug mode when class format is not checked.
64 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
65 #define JAVA_MIN_SUPPORTED_VERSION 45
66 #define JAVA_MAX_SUPPORTED_VERSION 51
67 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
69 // Used for two backward compatibility reasons:
70 // - to check for new additions to the class file format in JDK1.5
71 // - to check for bug fixes in the format checker in JDK1.5
72 #define JAVA_1_5_VERSION 49
74 // Used for backward compatibility reasons:
75 // - to check for javac bug fixes that happened after 1.5
76 // - also used as the max version when running in jdk6
77 #define JAVA_6_VERSION 50
79 // Used for backward compatibility reasons:
80 // - to check NameAndType_info signatures more aggressively
81 #define JAVA_7_VERSION 51
84 void ClassFileParser::parse_constant_pool_entries(Handle class_loader, constantPoolHandle cp, int length, TRAPS) {
85 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
86 // this function (_current can be allocated in a register, with scalar
87 // replacement of aggregates). The _current pointer is copied back to
88 // stream() when this function returns. DON'T call another method within
89 // this method that uses stream().
90 ClassFileStream* cfs0 = stream();
91 ClassFileStream cfs1 = *cfs0;
92 ClassFileStream* cfs = &cfs1;
93 #ifdef ASSERT
94 assert(cfs->allocated_on_stack(),"should be local");
95 u1* old_current = cfs0->current();
96 #endif
98 // Used for batching symbol allocations.
99 const char* names[SymbolTable::symbol_alloc_batch_size];
100 int lengths[SymbolTable::symbol_alloc_batch_size];
101 int indices[SymbolTable::symbol_alloc_batch_size];
102 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
103 int names_count = 0;
105 // parsing Index 0 is unused
106 for (int index = 1; index < length; index++) {
107 // Each of the following case guarantees one more byte in the stream
108 // for the following tag or the access_flags following constant pool,
109 // so we don't need bounds-check for reading tag.
110 u1 tag = cfs->get_u1_fast();
111 switch (tag) {
112 case JVM_CONSTANT_Class :
113 {
114 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
115 u2 name_index = cfs->get_u2_fast();
116 cp->klass_index_at_put(index, name_index);
117 }
118 break;
119 case JVM_CONSTANT_Fieldref :
120 {
121 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
122 u2 class_index = cfs->get_u2_fast();
123 u2 name_and_type_index = cfs->get_u2_fast();
124 cp->field_at_put(index, class_index, name_and_type_index);
125 }
126 break;
127 case JVM_CONSTANT_Methodref :
128 {
129 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
130 u2 class_index = cfs->get_u2_fast();
131 u2 name_and_type_index = cfs->get_u2_fast();
132 cp->method_at_put(index, class_index, name_and_type_index);
133 }
134 break;
135 case JVM_CONSTANT_InterfaceMethodref :
136 {
137 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
138 u2 class_index = cfs->get_u2_fast();
139 u2 name_and_type_index = cfs->get_u2_fast();
140 cp->interface_method_at_put(index, class_index, name_and_type_index);
141 }
142 break;
143 case JVM_CONSTANT_String :
144 {
145 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
146 u2 string_index = cfs->get_u2_fast();
147 cp->string_index_at_put(index, string_index);
148 }
149 break;
150 case JVM_CONSTANT_MethodHandle :
151 case JVM_CONSTANT_MethodType :
152 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
153 classfile_parse_error(
154 "Class file version does not support constant tag %u in class file %s",
155 tag, CHECK);
156 }
157 if (!EnableInvokeDynamic) {
158 classfile_parse_error(
159 "This JVM does not support constant tag %u in class file %s",
160 tag, CHECK);
161 }
162 if (tag == JVM_CONSTANT_MethodHandle) {
163 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
164 u1 ref_kind = cfs->get_u1_fast();
165 u2 method_index = cfs->get_u2_fast();
166 cp->method_handle_index_at_put(index, ref_kind, method_index);
167 } else if (tag == JVM_CONSTANT_MethodType) {
168 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
169 u2 signature_index = cfs->get_u2_fast();
170 cp->method_type_index_at_put(index, signature_index);
171 } else {
172 ShouldNotReachHere();
173 }
174 break;
175 case JVM_CONSTANT_InvokeDynamic :
176 {
177 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
178 classfile_parse_error(
179 "Class file version does not support constant tag %u in class file %s",
180 tag, CHECK);
181 }
182 if (!EnableInvokeDynamic) {
183 classfile_parse_error(
184 "This JVM does not support constant tag %u in class file %s",
185 tag, CHECK);
186 }
187 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
188 u2 bootstrap_specifier_index = cfs->get_u2_fast();
189 u2 name_and_type_index = cfs->get_u2_fast();
190 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
191 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
192 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
193 }
194 break;
195 case JVM_CONSTANT_Integer :
196 {
197 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
198 u4 bytes = cfs->get_u4_fast();
199 cp->int_at_put(index, (jint) bytes);
200 }
201 break;
202 case JVM_CONSTANT_Float :
203 {
204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
205 u4 bytes = cfs->get_u4_fast();
206 cp->float_at_put(index, *(jfloat*)&bytes);
207 }
208 break;
209 case JVM_CONSTANT_Long :
210 // A mangled type might cause you to overrun allocated memory
211 guarantee_property(index+1 < length,
212 "Invalid constant pool entry %u in class file %s",
213 index, CHECK);
214 {
215 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
216 u8 bytes = cfs->get_u8_fast();
217 cp->long_at_put(index, bytes);
218 }
219 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
220 break;
221 case JVM_CONSTANT_Double :
222 // A mangled type might cause you to overrun allocated memory
223 guarantee_property(index+1 < length,
224 "Invalid constant pool entry %u in class file %s",
225 index, CHECK);
226 {
227 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
228 u8 bytes = cfs->get_u8_fast();
229 cp->double_at_put(index, *(jdouble*)&bytes);
230 }
231 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
232 break;
233 case JVM_CONSTANT_NameAndType :
234 {
235 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
236 u2 name_index = cfs->get_u2_fast();
237 u2 signature_index = cfs->get_u2_fast();
238 cp->name_and_type_at_put(index, name_index, signature_index);
239 }
240 break;
241 case JVM_CONSTANT_Utf8 :
242 {
243 cfs->guarantee_more(2, CHECK); // utf8_length
244 u2 utf8_length = cfs->get_u2_fast();
245 u1* utf8_buffer = cfs->get_u1_buffer();
246 assert(utf8_buffer != NULL, "null utf8 buffer");
247 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
248 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
249 cfs->skip_u1_fast(utf8_length);
251 // Before storing the symbol, make sure it's legal
252 if (_need_verify) {
253 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
254 }
256 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
257 Handle patch = clear_cp_patch_at(index);
258 guarantee_property(java_lang_String::is_instance(patch()),
259 "Illegal utf8 patch at %d in class file %s",
260 index, CHECK);
261 char* str = java_lang_String::as_utf8_string(patch());
262 // (could use java_lang_String::as_symbol instead, but might as well batch them)
263 utf8_buffer = (u1*) str;
264 utf8_length = (int) strlen(str);
265 }
267 unsigned int hash;
268 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
269 if (result == NULL) {
270 names[names_count] = (char*)utf8_buffer;
271 lengths[names_count] = utf8_length;
272 indices[names_count] = index;
273 hashValues[names_count++] = hash;
274 if (names_count == SymbolTable::symbol_alloc_batch_size) {
275 SymbolTable::new_symbols(class_loader, cp, names_count, names, lengths, indices, hashValues, CHECK);
276 names_count = 0;
277 }
278 } else {
279 cp->symbol_at_put(index, result);
280 }
281 }
282 break;
283 default:
284 classfile_parse_error(
285 "Unknown constant tag %u in class file %s", tag, CHECK);
286 break;
287 }
288 }
290 // Allocate the remaining symbols
291 if (names_count > 0) {
292 SymbolTable::new_symbols(class_loader, cp, names_count, names, lengths, indices, hashValues, CHECK);
293 }
295 // Copy _current pointer of local copy back to stream().
296 #ifdef ASSERT
297 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
298 #endif
299 cfs0->set_current(cfs1.current());
300 }
302 // This class unreferences constant pool symbols if an error has occurred
303 // while parsing the class before it is assigned into the class.
304 // If it gets an error after that it is unloaded and the constant pool will
305 // be cleaned up then.
306 class ConstantPoolCleaner : public StackObj {
307 constantPoolHandle _cphandle;
308 bool _in_error;
309 public:
310 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
311 ~ConstantPoolCleaner() {
312 if (_in_error && _cphandle.not_null()) {
313 _cphandle->unreference_symbols();
314 }
315 }
316 void set_in_error(bool clean) { _in_error = clean; }
317 };
319 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
321 constantPoolHandle ClassFileParser::parse_constant_pool(Handle class_loader, TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
325 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
326 u2 length = cfs->get_u2_fast();
327 guarantee_property(
328 length >= 1, "Illegal constant pool size %u in class file %s",
329 length, CHECK_(nullHandle));
330 constantPoolOop constant_pool =
331 oopFactory::new_constantPool(length,
332 oopDesc::IsSafeConc,
333 CHECK_(nullHandle));
334 constantPoolHandle cp (THREAD, constant_pool);
336 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
337 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
339 // parsing constant pool entries
340 parse_constant_pool_entries(class_loader, cp, length, CHECK_(nullHandle));
342 int index = 1; // declared outside of loops for portability
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_cp_range(klass_ref_index, length) &&
360 is_klass_reference(cp, klass_ref_index),
361 "Invalid constant pool index %u in class file %s",
362 klass_ref_index,
363 CHECK_(nullHandle));
364 check_property(valid_cp_range(name_and_type_ref_index, length) &&
365 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
366 "Invalid constant pool index %u in class file %s",
367 name_and_type_ref_index,
368 CHECK_(nullHandle));
369 break;
370 }
371 case JVM_CONSTANT_String :
372 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
373 break;
374 case JVM_CONSTANT_Integer :
375 break;
376 case JVM_CONSTANT_Float :
377 break;
378 case JVM_CONSTANT_Long :
379 case JVM_CONSTANT_Double :
380 index++;
381 check_property(
382 (index < length && cp->tag_at(index).is_invalid()),
383 "Improper constant pool long/double index %u in class file %s",
384 index, CHECK_(nullHandle));
385 break;
386 case JVM_CONSTANT_NameAndType : {
387 if (!_need_verify) break;
388 int name_ref_index = cp->name_ref_index_at(index);
389 int signature_ref_index = cp->signature_ref_index_at(index);
390 check_property(
391 valid_cp_range(name_ref_index, length) &&
392 cp->tag_at(name_ref_index).is_utf8(),
393 "Invalid constant pool index %u in class file %s",
394 name_ref_index, CHECK_(nullHandle));
395 check_property(
396 valid_cp_range(signature_ref_index, length) &&
397 cp->tag_at(signature_ref_index).is_utf8(),
398 "Invalid constant pool index %u in class file %s",
399 signature_ref_index, CHECK_(nullHandle));
400 break;
401 }
402 case JVM_CONSTANT_Utf8 :
403 break;
404 case JVM_CONSTANT_UnresolvedClass : // fall-through
405 case JVM_CONSTANT_UnresolvedClassInError:
406 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
407 break;
408 case JVM_CONSTANT_ClassIndex :
409 {
410 int class_index = cp->klass_index_at(index);
411 check_property(
412 valid_cp_range(class_index, length) &&
413 cp->tag_at(class_index).is_utf8(),
414 "Invalid constant pool index %u in class file %s",
415 class_index, CHECK_(nullHandle));
416 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
417 }
418 break;
419 case JVM_CONSTANT_UnresolvedString :
420 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
421 break;
422 case JVM_CONSTANT_StringIndex :
423 {
424 int string_index = cp->string_index_at(index);
425 check_property(
426 valid_cp_range(string_index, length) &&
427 cp->tag_at(string_index).is_utf8(),
428 "Invalid constant pool index %u in class file %s",
429 string_index, CHECK_(nullHandle));
430 Symbol* sym = cp->symbol_at(string_index);
431 cp->unresolved_string_at_put(index, sym);
432 }
433 break;
434 case JVM_CONSTANT_MethodHandle :
435 {
436 int ref_index = cp->method_handle_index_at(index);
437 check_property(
438 valid_cp_range(ref_index, length) &&
439 EnableInvokeDynamic,
440 "Invalid constant pool index %u in class file %s",
441 ref_index, CHECK_(nullHandle));
442 constantTag tag = cp->tag_at(ref_index);
443 int ref_kind = cp->method_handle_ref_kind_at(index);
444 switch (ref_kind) {
445 case JVM_REF_getField:
446 case JVM_REF_getStatic:
447 case JVM_REF_putField:
448 case JVM_REF_putStatic:
449 check_property(
450 tag.is_field(),
451 "Invalid constant pool index %u in class file %s (not a field)",
452 ref_index, CHECK_(nullHandle));
453 break;
454 case JVM_REF_invokeVirtual:
455 case JVM_REF_invokeStatic:
456 case JVM_REF_invokeSpecial:
457 case JVM_REF_newInvokeSpecial:
458 check_property(
459 tag.is_method(),
460 "Invalid constant pool index %u in class file %s (not a method)",
461 ref_index, CHECK_(nullHandle));
462 break;
463 case JVM_REF_invokeInterface:
464 check_property(
465 tag.is_interface_method(),
466 "Invalid constant pool index %u in class file %s (not an interface method)",
467 ref_index, CHECK_(nullHandle));
468 break;
469 default:
470 classfile_parse_error(
471 "Bad method handle kind at constant pool index %u in class file %s",
472 index, CHECK_(nullHandle));
473 }
474 // Keep the ref_index unchanged. It will be indirected at link-time.
475 }
476 break;
477 case JVM_CONSTANT_MethodType :
478 {
479 int ref_index = cp->method_type_index_at(index);
480 check_property(
481 valid_cp_range(ref_index, length) &&
482 cp->tag_at(ref_index).is_utf8() &&
483 EnableInvokeDynamic,
484 "Invalid constant pool index %u in class file %s",
485 ref_index, CHECK_(nullHandle));
486 }
487 break;
488 case JVM_CONSTANT_InvokeDynamic :
489 {
490 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
491 check_property(valid_cp_range(name_and_type_ref_index, length) &&
492 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
493 "Invalid constant pool index %u in class file %s",
494 name_and_type_ref_index,
495 CHECK_(nullHandle));
496 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
497 break;
498 }
499 default:
500 fatal(err_msg("bad constant pool tag value %u",
501 cp->tag_at(index).value()));
502 ShouldNotReachHere();
503 break;
504 } // end of switch
505 } // end of for
507 if (_cp_patches != NULL) {
508 // need to treat this_class specially...
509 assert(EnableInvokeDynamic, "");
510 int this_class_index;
511 {
512 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
513 u1* mark = cfs->current();
514 u2 flags = cfs->get_u2_fast();
515 this_class_index = cfs->get_u2_fast();
516 cfs->set_current(mark); // revert to mark
517 }
519 for (index = 1; index < length; index++) { // Index 0 is unused
520 if (has_cp_patch_at(index)) {
521 guarantee_property(index != this_class_index,
522 "Illegal constant pool patch to self at %d in class file %s",
523 index, CHECK_(nullHandle));
524 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
525 }
526 }
527 // Ensure that all the patches have been used.
528 for (index = 0; index < _cp_patches->length(); index++) {
529 guarantee_property(!has_cp_patch_at(index),
530 "Unused constant pool patch at %d in class file %s",
531 index, CHECK_(nullHandle));
532 }
533 }
535 if (!_need_verify) {
536 cp_in_error.set_in_error(false);
537 return cp;
538 }
540 // second verification pass - checks the strings are of the right format.
541 // but not yet to the other entries
542 for (index = 1; index < length; index++) {
543 jbyte tag = cp->tag_at(index).value();
544 switch (tag) {
545 case JVM_CONSTANT_UnresolvedClass: {
546 Symbol* class_name = cp->unresolved_klass_at(index);
547 // check the name, even if _cp_patches will overwrite it
548 verify_legal_class_name(class_name, CHECK_(nullHandle));
549 break;
550 }
551 case JVM_CONSTANT_NameAndType: {
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 int sig_index = cp->signature_ref_index_at(index);
554 int name_index = cp->name_ref_index_at(index);
555 Symbol* name = cp->symbol_at(name_index);
556 Symbol* sig = cp->symbol_at(sig_index);
557 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
558 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
559 } else {
560 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
561 }
562 }
563 break;
564 }
565 case JVM_CONSTANT_InvokeDynamic:
566 case JVM_CONSTANT_Fieldref:
567 case JVM_CONSTANT_Methodref:
568 case JVM_CONSTANT_InterfaceMethodref: {
569 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
570 // already verified to be utf8
571 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
572 // already verified to be utf8
573 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
574 Symbol* name = cp->symbol_at(name_ref_index);
575 Symbol* signature = cp->symbol_at(signature_ref_index);
576 if (tag == JVM_CONSTANT_Fieldref) {
577 verify_legal_field_name(name, CHECK_(nullHandle));
578 if (_need_verify && _major_version >= JAVA_7_VERSION) {
579 // Signature is verified above, when iterating NameAndType_info.
580 // Need only to be sure it's the right type.
581 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
582 throwIllegalSignature(
583 "Field", name, signature, CHECK_(nullHandle));
584 }
585 } else {
586 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
587 }
588 } else {
589 verify_legal_method_name(name, CHECK_(nullHandle));
590 if (_need_verify && _major_version >= JAVA_7_VERSION) {
591 // Signature is verified above, when iterating NameAndType_info.
592 // Need only to be sure it's the right type.
593 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
594 throwIllegalSignature(
595 "Method", name, signature, CHECK_(nullHandle));
596 }
597 } else {
598 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
599 }
600 if (tag == JVM_CONSTANT_Methodref) {
601 // 4509014: If a class method name begins with '<', it must be "<init>".
602 assert(name != NULL, "method name in constant pool is null");
603 unsigned int name_len = name->utf8_length();
604 assert(name_len > 0, "bad method name"); // already verified as legal name
605 if (name->byte_at(0) == '<') {
606 if (name != vmSymbols::object_initializer_name()) {
607 classfile_parse_error(
608 "Bad method name at constant pool index %u in class file %s",
609 name_ref_index, CHECK_(nullHandle));
610 }
611 }
612 }
613 }
614 break;
615 }
616 case JVM_CONSTANT_MethodHandle: {
617 int ref_index = cp->method_handle_index_at(index);
618 int ref_kind = cp->method_handle_ref_kind_at(index);
619 switch (ref_kind) {
620 case JVM_REF_invokeVirtual:
621 case JVM_REF_invokeStatic:
622 case JVM_REF_invokeSpecial:
623 case JVM_REF_newInvokeSpecial:
624 {
625 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
626 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
627 Symbol* name = cp->symbol_at(name_ref_index);
628 if (ref_kind == JVM_REF_newInvokeSpecial) {
629 if (name != vmSymbols::object_initializer_name()) {
630 classfile_parse_error(
631 "Bad constructor name at constant pool index %u in class file %s",
632 name_ref_index, CHECK_(nullHandle));
633 }
634 } else {
635 if (name == vmSymbols::object_initializer_name()) {
636 classfile_parse_error(
637 "Bad method name at constant pool index %u in class file %s",
638 name_ref_index, CHECK_(nullHandle));
639 }
640 }
641 }
642 break;
643 // Other ref_kinds are already fully checked in previous pass.
644 }
645 break;
646 }
647 case JVM_CONSTANT_MethodType: {
648 Symbol* no_name = vmSymbols::type_name(); // place holder
649 Symbol* signature = cp->method_type_signature_at(index);
650 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
651 break;
652 }
653 case JVM_CONSTANT_Utf8: {
654 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
655 }
656 } // end of switch
657 } // end of for
659 cp_in_error.set_in_error(false);
660 return cp;
661 }
664 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
665 assert(EnableInvokeDynamic, "");
666 BasicType patch_type = T_VOID;
667 switch (cp->tag_at(index).value()) {
669 case JVM_CONSTANT_UnresolvedClass :
670 // Patching a class means pre-resolving it.
671 // The name in the constant pool is ignored.
672 if (java_lang_Class::is_instance(patch())) {
673 guarantee_property(!java_lang_Class::is_primitive(patch()),
674 "Illegal class patch at %d in class file %s",
675 index, CHECK);
676 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
677 } else {
678 guarantee_property(java_lang_String::is_instance(patch()),
679 "Illegal class patch at %d in class file %s",
680 index, CHECK);
681 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
682 cp->unresolved_klass_at_put(index, name);
683 }
684 break;
686 case JVM_CONSTANT_UnresolvedString :
687 // Patching a string means pre-resolving it.
688 // The spelling in the constant pool is ignored.
689 // The constant reference may be any object whatever.
690 // If it is not a real interned string, the constant is referred
691 // to as a "pseudo-string", and must be presented to the CP
692 // explicitly, because it may require scavenging.
693 cp->pseudo_string_at_put(index, patch());
694 break;
696 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
697 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
698 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
699 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
700 patch_prim:
701 {
702 jvalue value;
703 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
704 guarantee_property(value_type == patch_type,
705 "Illegal primitive patch at %d in class file %s",
706 index, CHECK);
707 switch (value_type) {
708 case T_INT: cp->int_at_put(index, value.i); break;
709 case T_FLOAT: cp->float_at_put(index, value.f); break;
710 case T_LONG: cp->long_at_put(index, value.j); break;
711 case T_DOUBLE: cp->double_at_put(index, value.d); break;
712 default: assert(false, "");
713 }
714 }
715 break;
717 default:
718 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
719 guarantee_property(!has_cp_patch_at(index),
720 "Illegal unexpected patch at %d in class file %s",
721 index, CHECK);
722 return;
723 }
725 // On fall-through, mark the patch as used.
726 clear_cp_patch_at(index);
727 }
731 class NameSigHash: public ResourceObj {
732 public:
733 Symbol* _name; // name
734 Symbol* _sig; // signature
735 NameSigHash* _next; // Next entry in hash table
736 };
739 #define HASH_ROW_SIZE 256
741 unsigned int hash(Symbol* name, Symbol* sig) {
742 unsigned int raw_hash = 0;
743 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
744 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
746 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
747 }
750 void initialize_hashtable(NameSigHash** table) {
751 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
752 }
754 // Return false if the name/sig combination is found in table.
755 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
756 // The old format checker uses heap sort to find duplicates.
757 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
758 // of table since we don't expect Symbol*'s to move.
759 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
760 assert(name != NULL, "name in constant pool is NULL");
762 // First lookup for duplicates
763 int index = hash(name, sig);
764 NameSigHash* entry = table[index];
765 while (entry != NULL) {
766 if (entry->_name == name && entry->_sig == sig) {
767 return false;
768 }
769 entry = entry->_next;
770 }
772 // No duplicate is found, allocate a new entry and fill it.
773 entry = new NameSigHash();
774 entry->_name = name;
775 entry->_sig = sig;
777 // Insert into hash table
778 entry->_next = table[index];
779 table[index] = entry;
781 return true;
782 }
785 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
786 int length,
787 Handle class_loader,
788 Handle protection_domain,
789 Symbol* class_name,
790 TRAPS) {
791 ClassFileStream* cfs = stream();
792 assert(length > 0, "only called for length>0");
793 objArrayHandle nullHandle;
794 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
795 objArrayHandle interfaces (THREAD, interface_oop);
797 int index;
798 for (index = 0; index < length; index++) {
799 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
800 KlassHandle interf;
801 check_property(
802 valid_cp_range(interface_index, cp->length()) &&
803 is_klass_reference(cp, interface_index),
804 "Interface name has bad constant pool index %u in class file %s",
805 interface_index, CHECK_(nullHandle));
806 if (cp->tag_at(interface_index).is_klass()) {
807 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
808 } else {
809 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
811 // Don't need to check legal name because it's checked when parsing constant pool.
812 // But need to make sure it's not an array type.
813 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
814 "Bad interface name in class file %s", CHECK_(nullHandle));
816 // Call resolve_super so classcircularity is checked
817 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
818 unresolved_klass, class_loader, protection_domain,
819 false, CHECK_(nullHandle));
820 interf = KlassHandle(THREAD, k);
822 if (LinkWellKnownClasses) // my super type is well known to me
823 cp->klass_at_put(interface_index, interf()); // eagerly resolve
824 }
826 if (!Klass::cast(interf())->is_interface()) {
827 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
828 }
829 interfaces->obj_at_put(index, interf());
830 }
832 if (!_need_verify || length <= 1) {
833 return interfaces;
834 }
836 // Check if there's any duplicates in interfaces
837 ResourceMark rm(THREAD);
838 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
839 THREAD, NameSigHash*, HASH_ROW_SIZE);
840 initialize_hashtable(interface_names);
841 bool dup = false;
842 {
843 debug_only(No_Safepoint_Verifier nsv;)
844 for (index = 0; index < length; index++) {
845 klassOop k = (klassOop)interfaces->obj_at(index);
846 Symbol* name = instanceKlass::cast(k)->name();
847 // If no duplicates, add (name, NULL) in hashtable interface_names.
848 if (!put_after_lookup(name, NULL, interface_names)) {
849 dup = true;
850 break;
851 }
852 }
853 }
854 if (dup) {
855 classfile_parse_error("Duplicate interface name in class file %s",
856 CHECK_(nullHandle));
857 }
859 return interfaces;
860 }
863 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
864 // Make sure the constant pool entry is of a type appropriate to this field
865 guarantee_property(
866 (constantvalue_index > 0 &&
867 constantvalue_index < cp->length()),
868 "Bad initial value index %u in ConstantValue attribute in class file %s",
869 constantvalue_index, CHECK);
870 constantTag value_type = cp->tag_at(constantvalue_index);
871 switch ( cp->basic_type_for_signature_at(signature_index) ) {
872 case T_LONG:
873 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
874 break;
875 case T_FLOAT:
876 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
877 break;
878 case T_DOUBLE:
879 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
880 break;
881 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
882 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
883 break;
884 case T_OBJECT:
885 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
886 && (value_type.is_string() || value_type.is_unresolved_string())),
887 "Bad string initial value in class file %s", CHECK);
888 break;
889 default:
890 classfile_parse_error(
891 "Unable to set initial value %u in class file %s",
892 constantvalue_index, CHECK);
893 }
894 }
897 // Parse attributes for a field.
898 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
899 u2 attributes_count,
900 bool is_static, u2 signature_index,
901 u2* constantvalue_index_addr,
902 bool* is_synthetic_addr,
903 u2* generic_signature_index_addr,
904 typeArrayHandle* field_annotations,
905 TRAPS) {
906 ClassFileStream* cfs = stream();
907 assert(attributes_count > 0, "length should be greater than 0");
908 u2 constantvalue_index = 0;
909 u2 generic_signature_index = 0;
910 bool is_synthetic = false;
911 u1* runtime_visible_annotations = NULL;
912 int runtime_visible_annotations_length = 0;
913 u1* runtime_invisible_annotations = NULL;
914 int runtime_invisible_annotations_length = 0;
915 while (attributes_count--) {
916 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
917 u2 attribute_name_index = cfs->get_u2_fast();
918 u4 attribute_length = cfs->get_u4_fast();
919 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
920 cp->tag_at(attribute_name_index).is_utf8(),
921 "Invalid field attribute index %u in class file %s",
922 attribute_name_index,
923 CHECK);
924 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
925 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
926 // ignore if non-static
927 if (constantvalue_index != 0) {
928 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
929 }
930 check_property(
931 attribute_length == 2,
932 "Invalid ConstantValue field attribute length %u in class file %s",
933 attribute_length, CHECK);
934 constantvalue_index = cfs->get_u2(CHECK);
935 if (_need_verify) {
936 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
937 }
938 } else if (attribute_name == vmSymbols::tag_synthetic()) {
939 if (attribute_length != 0) {
940 classfile_parse_error(
941 "Invalid Synthetic field attribute length %u in class file %s",
942 attribute_length, CHECK);
943 }
944 is_synthetic = true;
945 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
946 if (attribute_length != 0) {
947 classfile_parse_error(
948 "Invalid Deprecated field attribute length %u in class file %s",
949 attribute_length, CHECK);
950 }
951 } else if (_major_version >= JAVA_1_5_VERSION) {
952 if (attribute_name == vmSymbols::tag_signature()) {
953 if (attribute_length != 2) {
954 classfile_parse_error(
955 "Wrong size %u for field's Signature attribute in class file %s",
956 attribute_length, CHECK);
957 }
958 generic_signature_index = cfs->get_u2(CHECK);
959 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
960 runtime_visible_annotations_length = attribute_length;
961 runtime_visible_annotations = cfs->get_u1_buffer();
962 assert(runtime_visible_annotations != NULL, "null visible annotations");
963 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
964 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
965 runtime_invisible_annotations_length = attribute_length;
966 runtime_invisible_annotations = cfs->get_u1_buffer();
967 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
968 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
969 } else {
970 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
971 }
972 } else {
973 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
974 }
975 }
977 *constantvalue_index_addr = constantvalue_index;
978 *is_synthetic_addr = is_synthetic;
979 *generic_signature_index_addr = generic_signature_index;
980 *field_annotations = assemble_annotations(runtime_visible_annotations,
981 runtime_visible_annotations_length,
982 runtime_invisible_annotations,
983 runtime_invisible_annotations_length,
984 CHECK);
985 return;
986 }
989 // Field allocation types. Used for computing field offsets.
991 enum FieldAllocationType {
992 STATIC_OOP, // Oops
993 STATIC_BYTE, // Boolean, Byte, char
994 STATIC_SHORT, // shorts
995 STATIC_WORD, // ints
996 STATIC_DOUBLE, // aligned long or double
997 NONSTATIC_OOP,
998 NONSTATIC_BYTE,
999 NONSTATIC_SHORT,
1000 NONSTATIC_WORD,
1001 NONSTATIC_DOUBLE,
1002 MAX_FIELD_ALLOCATION_TYPE,
1003 BAD_ALLOCATION_TYPE = -1
1004 };
1006 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1007 BAD_ALLOCATION_TYPE, // 0
1008 BAD_ALLOCATION_TYPE, // 1
1009 BAD_ALLOCATION_TYPE, // 2
1010 BAD_ALLOCATION_TYPE, // 3
1011 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1012 NONSTATIC_SHORT, // T_CHAR = 5,
1013 NONSTATIC_WORD, // T_FLOAT = 6,
1014 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1015 NONSTATIC_BYTE, // T_BYTE = 8,
1016 NONSTATIC_SHORT, // T_SHORT = 9,
1017 NONSTATIC_WORD, // T_INT = 10,
1018 NONSTATIC_DOUBLE, // T_LONG = 11,
1019 NONSTATIC_OOP, // T_OBJECT = 12,
1020 NONSTATIC_OOP, // T_ARRAY = 13,
1021 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1022 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1023 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1024 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1025 BAD_ALLOCATION_TYPE, // 0
1026 BAD_ALLOCATION_TYPE, // 1
1027 BAD_ALLOCATION_TYPE, // 2
1028 BAD_ALLOCATION_TYPE, // 3
1029 STATIC_BYTE , // T_BOOLEAN = 4,
1030 STATIC_SHORT, // T_CHAR = 5,
1031 STATIC_WORD, // T_FLOAT = 6,
1032 STATIC_DOUBLE, // T_DOUBLE = 7,
1033 STATIC_BYTE, // T_BYTE = 8,
1034 STATIC_SHORT, // T_SHORT = 9,
1035 STATIC_WORD, // T_INT = 10,
1036 STATIC_DOUBLE, // T_LONG = 11,
1037 STATIC_OOP, // T_OBJECT = 12,
1038 STATIC_OOP, // T_ARRAY = 13,
1039 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1040 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1041 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1042 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1043 };
1045 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1046 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1047 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1048 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1049 return result;
1050 }
1052 class FieldAllocationCount: public ResourceObj {
1053 public:
1054 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1056 FieldAllocationCount() {
1057 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1058 count[i] = 0;
1059 }
1060 }
1062 FieldAllocationType update(bool is_static, BasicType type) {
1063 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1064 // Make sure there is no overflow with injected fields.
1065 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1066 count[atype]++;
1067 return atype;
1068 }
1069 };
1072 typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
1073 constantPoolHandle cp, bool is_interface,
1074 FieldAllocationCount *fac,
1075 objArrayHandle* fields_annotations,
1076 u2* java_fields_count_ptr, TRAPS) {
1077 ClassFileStream* cfs = stream();
1078 typeArrayHandle nullHandle;
1079 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1080 u2 length = cfs->get_u2_fast();
1081 *java_fields_count_ptr = length;
1083 int num_injected = 0;
1084 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1085 int total_fields = length + num_injected;
1087 // The field array starts with tuples of shorts
1088 // [access, name index, sig index, initial value index, byte offset].
1089 // A generic signature slot only exists for field with generic
1090 // signature attribute. And the access flag is set with
1091 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1092 // signature slots are at the end of the field array and after all
1093 // other fields data.
1094 //
1095 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1096 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1097 // ...
1098 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1099 // [generic signature index]
1100 // [generic signature index]
1101 // ...
1102 //
1103 // Allocate a temporary resource array for field data. For each field,
1104 // a slot is reserved in the temporary array for the generic signature
1105 // index. After parsing all fields, the data are copied to a permanent
1106 // array and any unused slots will be discarded.
1107 ResourceMark rm(THREAD);
1108 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1109 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1111 typeArrayHandle field_annotations;
1112 // The generic signature slots start after all other fields' data.
1113 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1114 int num_generic_signature = 0;
1115 for (int n = 0; n < length; n++) {
1116 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1118 AccessFlags access_flags;
1119 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1120 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1121 access_flags.set_flags(flags);
1123 u2 name_index = cfs->get_u2_fast();
1124 int cp_size = cp->length();
1125 check_property(
1126 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1127 "Invalid constant pool index %u for field name in class file %s",
1128 name_index, CHECK_(nullHandle));
1129 Symbol* name = cp->symbol_at(name_index);
1130 verify_legal_field_name(name, CHECK_(nullHandle));
1132 u2 signature_index = cfs->get_u2_fast();
1133 check_property(
1134 valid_cp_range(signature_index, cp_size) &&
1135 cp->tag_at(signature_index).is_utf8(),
1136 "Invalid constant pool index %u for field signature in class file %s",
1137 signature_index, CHECK_(nullHandle));
1138 Symbol* sig = cp->symbol_at(signature_index);
1139 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1141 u2 constantvalue_index = 0;
1142 bool is_synthetic = false;
1143 u2 generic_signature_index = 0;
1144 bool is_static = access_flags.is_static();
1146 u2 attributes_count = cfs->get_u2_fast();
1147 if (attributes_count > 0) {
1148 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1149 &constantvalue_index, &is_synthetic,
1150 &generic_signature_index, &field_annotations,
1151 CHECK_(nullHandle));
1152 if (field_annotations.not_null()) {
1153 if (fields_annotations->is_null()) {
1154 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1155 *fields_annotations = objArrayHandle(THREAD, md);
1156 }
1157 (*fields_annotations)->obj_at_put(n, field_annotations());
1158 }
1159 if (is_synthetic) {
1160 access_flags.set_is_synthetic();
1161 }
1162 if (generic_signature_index != 0) {
1163 access_flags.set_field_has_generic_signature();
1164 fa[generic_signature_slot] = generic_signature_index;
1165 generic_signature_slot ++;
1166 num_generic_signature ++;
1167 }
1168 }
1170 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1171 field->initialize(access_flags.as_short(),
1172 name_index,
1173 signature_index,
1174 constantvalue_index,
1175 0);
1177 BasicType type = cp->basic_type_for_signature_at(signature_index);
1179 // Remember how many oops we encountered and compute allocation type
1180 FieldAllocationType atype = fac->update(is_static, type);
1182 // The correct offset is computed later (all oop fields will be located together)
1183 // We temporarily store the allocation type in the offset field
1184 field->set_offset(atype);
1185 }
1187 int index = length;
1188 if (num_injected != 0) {
1189 for (int n = 0; n < num_injected; n++) {
1190 // Check for duplicates
1191 if (injected[n].may_be_java) {
1192 Symbol* name = injected[n].name();
1193 Symbol* signature = injected[n].signature();
1194 bool duplicate = false;
1195 for (int i = 0; i < length; i++) {
1196 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1197 if (name == cp->symbol_at(f->name_index()) &&
1198 signature == cp->symbol_at(f->signature_index())) {
1199 // Symbol is desclared in Java so skip this one
1200 duplicate = true;
1201 break;
1202 }
1203 }
1204 if (duplicate) {
1205 // These will be removed from the field array at the end
1206 continue;
1207 }
1208 }
1210 // Injected field
1211 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1212 field->initialize(JVM_ACC_FIELD_INTERNAL,
1213 injected[n].name_index,
1214 injected[n].signature_index,
1215 0,
1216 0);
1218 BasicType type = FieldType::basic_type(injected[n].signature());
1220 // Remember how many oops we encountered and compute allocation type
1221 FieldAllocationType atype = fac->update(false, type);
1223 // The correct offset is computed later (all oop fields will be located together)
1224 // We temporarily store the allocation type in the offset field
1225 field->set_offset(atype);
1226 index++;
1227 }
1228 }
1230 // Now copy the fields' data from the temporary resource array.
1231 // Sometimes injected fields already exist in the Java source so
1232 // the fields array could be too long. In that case the
1233 // fields array is trimed. Also unused slots that were reserved
1234 // for generic signature indexes are discarded.
1235 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(
1236 index * FieldInfo::field_slots + num_generic_signature,
1237 CHECK_(nullHandle));
1238 typeArrayHandle fields(THREAD, new_fields);
1239 {
1240 int i = 0;
1241 for (; i < index * FieldInfo::field_slots; i++) {
1242 new_fields->short_at_put(i, fa[i]);
1243 }
1244 for (int j = total_fields * FieldInfo::field_slots;
1245 j < generic_signature_slot; j++) {
1246 new_fields->short_at_put(i++, fa[j]);
1247 }
1248 assert(i == new_fields->length(), "");
1249 }
1251 if (_need_verify && length > 1) {
1252 // Check duplicated fields
1253 ResourceMark rm(THREAD);
1254 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1255 THREAD, NameSigHash*, HASH_ROW_SIZE);
1256 initialize_hashtable(names_and_sigs);
1257 bool dup = false;
1258 {
1259 debug_only(No_Safepoint_Verifier nsv;)
1260 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1261 Symbol* name = fs.name();
1262 Symbol* sig = fs.signature();
1263 // If no duplicates, add name/signature in hashtable names_and_sigs.
1264 if (!put_after_lookup(name, sig, names_and_sigs)) {
1265 dup = true;
1266 break;
1267 }
1268 }
1269 }
1270 if (dup) {
1271 classfile_parse_error("Duplicate field name&signature in class file %s",
1272 CHECK_(nullHandle));
1273 }
1274 }
1276 return fields;
1277 }
1280 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1281 while (length-- > 0) {
1282 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1283 }
1284 }
1287 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1288 u4 exception_table_length,
1289 constantPoolHandle cp,
1290 TRAPS) {
1291 ClassFileStream* cfs = stream();
1292 typeArrayHandle nullHandle;
1294 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1295 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1296 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1298 int index = 0;
1299 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1300 for (unsigned int i = 0; i < exception_table_length; i++) {
1301 u2 start_pc = cfs->get_u2_fast();
1302 u2 end_pc = cfs->get_u2_fast();
1303 u2 handler_pc = cfs->get_u2_fast();
1304 u2 catch_type_index = cfs->get_u2_fast();
1305 // Will check legal target after parsing code array in verifier.
1306 if (_need_verify) {
1307 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1308 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1309 guarantee_property(handler_pc < code_length,
1310 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1311 if (catch_type_index != 0) {
1312 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1313 is_klass_reference(cp, catch_type_index),
1314 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1315 }
1316 }
1317 exception_handlers->int_at_put(index++, start_pc);
1318 exception_handlers->int_at_put(index++, end_pc);
1319 exception_handlers->int_at_put(index++, handler_pc);
1320 exception_handlers->int_at_put(index++, catch_type_index);
1321 }
1322 return exception_handlers;
1323 }
1325 void ClassFileParser::parse_linenumber_table(
1326 u4 code_attribute_length, u4 code_length,
1327 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1328 ClassFileStream* cfs = stream();
1329 unsigned int num_entries = cfs->get_u2(CHECK);
1331 // Each entry is a u2 start_pc, and a u2 line_number
1332 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1334 // Verify line number attribute and table length
1335 check_property(
1336 code_attribute_length == sizeof(u2) + length_in_bytes,
1337 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1339 cfs->guarantee_more(length_in_bytes, CHECK);
1341 if ((*write_stream) == NULL) {
1342 if (length_in_bytes > fixed_buffer_size) {
1343 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1344 } else {
1345 (*write_stream) = new CompressedLineNumberWriteStream(
1346 linenumbertable_buffer, fixed_buffer_size);
1347 }
1348 }
1350 while (num_entries-- > 0) {
1351 u2 bci = cfs->get_u2_fast(); // start_pc
1352 u2 line = cfs->get_u2_fast(); // line_number
1353 guarantee_property(bci < code_length,
1354 "Invalid pc in LineNumberTable in class file %s", CHECK);
1355 (*write_stream)->write_pair(bci, line);
1356 }
1357 }
1360 // Class file LocalVariableTable elements.
1361 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1362 public:
1363 u2 start_bci;
1364 u2 length;
1365 u2 name_cp_index;
1366 u2 descriptor_cp_index;
1367 u2 slot;
1368 };
1371 class LVT_Hash: public CHeapObj {
1372 public:
1373 LocalVariableTableElement *_elem; // element
1374 LVT_Hash* _next; // Next entry in hash table
1375 };
1377 unsigned int hash(LocalVariableTableElement *elem) {
1378 unsigned int raw_hash = elem->start_bci;
1380 raw_hash = elem->length + raw_hash * 37;
1381 raw_hash = elem->name_cp_index + raw_hash * 37;
1382 raw_hash = elem->slot + raw_hash * 37;
1384 return raw_hash % HASH_ROW_SIZE;
1385 }
1387 void initialize_hashtable(LVT_Hash** table) {
1388 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1389 table[i] = NULL;
1390 }
1391 }
1393 void clear_hashtable(LVT_Hash** table) {
1394 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1395 LVT_Hash* current = table[i];
1396 LVT_Hash* next;
1397 while (current != NULL) {
1398 next = current->_next;
1399 current->_next = NULL;
1400 delete(current);
1401 current = next;
1402 }
1403 table[i] = NULL;
1404 }
1405 }
1407 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1408 LVT_Hash* entry = table[index];
1410 /*
1411 * 3-tuple start_bci/length/slot has to be unique key,
1412 * so the following comparison seems to be redundant:
1413 * && elem->name_cp_index == entry->_elem->name_cp_index
1414 */
1415 while (entry != NULL) {
1416 if (elem->start_bci == entry->_elem->start_bci
1417 && elem->length == entry->_elem->length
1418 && elem->name_cp_index == entry->_elem->name_cp_index
1419 && elem->slot == entry->_elem->slot
1420 ) {
1421 return entry;
1422 }
1423 entry = entry->_next;
1424 }
1425 return NULL;
1426 }
1428 // Return false if the local variable is found in table.
1429 // Return true if no duplicate is found.
1430 // And local variable is added as a new entry in table.
1431 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1432 // First lookup for duplicates
1433 int index = hash(elem);
1434 LVT_Hash* entry = LVT_lookup(elem, index, table);
1436 if (entry != NULL) {
1437 return false;
1438 }
1439 // No duplicate is found, allocate a new entry and fill it.
1440 if ((entry = new LVT_Hash()) == NULL) {
1441 return false;
1442 }
1443 entry->_elem = elem;
1445 // Insert into hash table
1446 entry->_next = table[index];
1447 table[index] = entry;
1449 return true;
1450 }
1452 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1453 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1454 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1455 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1456 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1457 lvt->signature_cp_index = 0;
1458 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1459 }
1461 // Function is used to parse both attributes:
1462 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1463 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1464 u2 max_locals,
1465 u4 code_attribute_length,
1466 constantPoolHandle cp,
1467 u2* localvariable_table_length,
1468 bool isLVTT,
1469 TRAPS) {
1470 ClassFileStream* cfs = stream();
1471 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1472 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1473 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1474 // Verify local variable table attribute has right length
1475 if (_need_verify) {
1476 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1477 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1478 }
1479 u2* localvariable_table_start = cfs->get_u2_buffer();
1480 assert(localvariable_table_start != NULL, "null local variable table");
1481 if (!_need_verify) {
1482 cfs->skip_u2_fast(size);
1483 } else {
1484 cfs->guarantee_more(size * 2, CHECK_NULL);
1485 for(int i = 0; i < (*localvariable_table_length); i++) {
1486 u2 start_pc = cfs->get_u2_fast();
1487 u2 length = cfs->get_u2_fast();
1488 u2 name_index = cfs->get_u2_fast();
1489 u2 descriptor_index = cfs->get_u2_fast();
1490 u2 index = cfs->get_u2_fast();
1491 // Assign to a u4 to avoid overflow
1492 u4 end_pc = (u4)start_pc + (u4)length;
1494 if (start_pc >= code_length) {
1495 classfile_parse_error(
1496 "Invalid start_pc %u in %s in class file %s",
1497 start_pc, tbl_name, CHECK_NULL);
1498 }
1499 if (end_pc > code_length) {
1500 classfile_parse_error(
1501 "Invalid length %u in %s in class file %s",
1502 length, tbl_name, CHECK_NULL);
1503 }
1504 int cp_size = cp->length();
1505 guarantee_property(
1506 valid_cp_range(name_index, cp_size) &&
1507 cp->tag_at(name_index).is_utf8(),
1508 "Name index %u in %s has bad constant type in class file %s",
1509 name_index, tbl_name, CHECK_NULL);
1510 guarantee_property(
1511 valid_cp_range(descriptor_index, cp_size) &&
1512 cp->tag_at(descriptor_index).is_utf8(),
1513 "Signature index %u in %s has bad constant type in class file %s",
1514 descriptor_index, tbl_name, CHECK_NULL);
1516 Symbol* name = cp->symbol_at(name_index);
1517 Symbol* sig = cp->symbol_at(descriptor_index);
1518 verify_legal_field_name(name, CHECK_NULL);
1519 u2 extra_slot = 0;
1520 if (!isLVTT) {
1521 verify_legal_field_signature(name, sig, CHECK_NULL);
1523 // 4894874: check special cases for double and long local variables
1524 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1525 sig == vmSymbols::type_signature(T_LONG)) {
1526 extra_slot = 1;
1527 }
1528 }
1529 guarantee_property((index + extra_slot) < max_locals,
1530 "Invalid index %u in %s in class file %s",
1531 index, tbl_name, CHECK_NULL);
1532 }
1533 }
1534 return localvariable_table_start;
1535 }
1538 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1539 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1540 ClassFileStream* cfs = stream();
1541 u2 index = 0; // index in the array with long/double occupying two slots
1542 u4 i1 = *u1_index;
1543 u4 i2 = *u2_index + 1;
1544 for(int i = 0; i < array_length; i++) {
1545 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1546 index++;
1547 if (tag == ITEM_Long || tag == ITEM_Double) {
1548 index++;
1549 } else if (tag == ITEM_Object) {
1550 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1551 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1552 is_klass_reference(cp, class_index),
1553 "Bad class index %u in StackMap in class file %s",
1554 class_index, CHECK);
1555 } else if (tag == ITEM_Uninitialized) {
1556 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1557 guarantee_property(
1558 offset < code_length,
1559 "Bad uninitialized type offset %u in StackMap in class file %s",
1560 offset, CHECK);
1561 } else {
1562 guarantee_property(
1563 tag <= (u1)ITEM_Uninitialized,
1564 "Unknown variable type %u in StackMap in class file %s",
1565 tag, CHECK);
1566 }
1567 }
1568 u2_array[*u2_index] = index;
1569 *u1_index = i1;
1570 *u2_index = i2;
1571 }
1573 typeArrayOop ClassFileParser::parse_stackmap_table(
1574 u4 code_attribute_length, TRAPS) {
1575 if (code_attribute_length == 0)
1576 return NULL;
1578 ClassFileStream* cfs = stream();
1579 u1* stackmap_table_start = cfs->get_u1_buffer();
1580 assert(stackmap_table_start != NULL, "null stackmap table");
1582 // check code_attribute_length first
1583 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1585 if (!_need_verify && !DumpSharedSpaces) {
1586 return NULL;
1587 }
1589 typeArrayOop stackmap_data =
1590 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1592 stackmap_data->set_length(code_attribute_length);
1593 memcpy((void*)stackmap_data->byte_at_addr(0),
1594 (void*)stackmap_table_start, code_attribute_length);
1595 return stackmap_data;
1596 }
1598 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1599 u4 method_attribute_length,
1600 constantPoolHandle cp, TRAPS) {
1601 ClassFileStream* cfs = stream();
1602 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1603 *checked_exceptions_length = cfs->get_u2_fast();
1604 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1605 u2* checked_exceptions_start = cfs->get_u2_buffer();
1606 assert(checked_exceptions_start != NULL, "null checked exceptions");
1607 if (!_need_verify) {
1608 cfs->skip_u2_fast(size);
1609 } else {
1610 // Verify each value in the checked exception table
1611 u2 checked_exception;
1612 u2 len = *checked_exceptions_length;
1613 cfs->guarantee_more(2 * len, CHECK_NULL);
1614 for (int i = 0; i < len; i++) {
1615 checked_exception = cfs->get_u2_fast();
1616 check_property(
1617 valid_cp_range(checked_exception, cp->length()) &&
1618 is_klass_reference(cp, checked_exception),
1619 "Exception name has bad type at constant pool %u in class file %s",
1620 checked_exception, CHECK_NULL);
1621 }
1622 }
1623 // check exceptions attribute length
1624 if (_need_verify) {
1625 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1626 sizeof(u2) * size),
1627 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1628 }
1629 return checked_exceptions_start;
1630 }
1632 void ClassFileParser::throwIllegalSignature(
1633 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1634 ResourceMark rm(THREAD);
1635 Exceptions::fthrow(THREAD_AND_LOCATION,
1636 vmSymbols::java_lang_ClassFormatError(),
1637 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1638 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1639 }
1641 #define MAX_ARGS_SIZE 255
1642 #define MAX_CODE_SIZE 65535
1643 #define INITIAL_MAX_LVT_NUMBER 256
1645 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1646 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1647 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1648 // entire method attribute is parsed.
1649 //
1650 // The promoted_flags parameter is used to pass relevant access_flags
1651 // from the method back up to the containing klass. These flag values
1652 // are added to klass's access_flags.
1654 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1655 AccessFlags *promoted_flags,
1656 typeArrayHandle* method_annotations,
1657 typeArrayHandle* method_parameter_annotations,
1658 typeArrayHandle* method_default_annotations,
1659 TRAPS) {
1660 ClassFileStream* cfs = stream();
1661 methodHandle nullHandle;
1662 ResourceMark rm(THREAD);
1663 // Parse fixed parts
1664 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1666 int flags = cfs->get_u2_fast();
1667 u2 name_index = cfs->get_u2_fast();
1668 int cp_size = cp->length();
1669 check_property(
1670 valid_cp_range(name_index, cp_size) &&
1671 cp->tag_at(name_index).is_utf8(),
1672 "Illegal constant pool index %u for method name in class file %s",
1673 name_index, CHECK_(nullHandle));
1674 Symbol* name = cp->symbol_at(name_index);
1675 verify_legal_method_name(name, CHECK_(nullHandle));
1677 u2 signature_index = cfs->get_u2_fast();
1678 guarantee_property(
1679 valid_cp_range(signature_index, cp_size) &&
1680 cp->tag_at(signature_index).is_utf8(),
1681 "Illegal constant pool index %u for method signature in class file %s",
1682 signature_index, CHECK_(nullHandle));
1683 Symbol* signature = cp->symbol_at(signature_index);
1685 AccessFlags access_flags;
1686 if (name == vmSymbols::class_initializer_name()) {
1687 // We ignore the other access flags for a valid class initializer.
1688 // (JVM Spec 2nd ed., chapter 4.6)
1689 if (_major_version < 51) { // backward compatibility
1690 flags = JVM_ACC_STATIC;
1691 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1692 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1693 }
1694 } else {
1695 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1696 }
1698 int args_size = -1; // only used when _need_verify is true
1699 if (_need_verify) {
1700 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1701 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1702 if (args_size > MAX_ARGS_SIZE) {
1703 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1704 }
1705 }
1707 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1709 // Default values for code and exceptions attribute elements
1710 u2 max_stack = 0;
1711 u2 max_locals = 0;
1712 u4 code_length = 0;
1713 u1* code_start = 0;
1714 u2 exception_table_length = 0;
1715 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1716 u2 checked_exceptions_length = 0;
1717 u2* checked_exceptions_start = NULL;
1718 CompressedLineNumberWriteStream* linenumber_table = NULL;
1719 int linenumber_table_length = 0;
1720 int total_lvt_length = 0;
1721 u2 lvt_cnt = 0;
1722 u2 lvtt_cnt = 0;
1723 bool lvt_allocated = false;
1724 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1725 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1726 u2* localvariable_table_length;
1727 u2** localvariable_table_start;
1728 u2* localvariable_type_table_length;
1729 u2** localvariable_type_table_start;
1730 bool parsed_code_attribute = false;
1731 bool parsed_checked_exceptions_attribute = false;
1732 bool parsed_stackmap_attribute = false;
1733 // stackmap attribute - JDK1.5
1734 typeArrayHandle stackmap_data;
1735 u2 generic_signature_index = 0;
1736 u1* runtime_visible_annotations = NULL;
1737 int runtime_visible_annotations_length = 0;
1738 u1* runtime_invisible_annotations = NULL;
1739 int runtime_invisible_annotations_length = 0;
1740 u1* runtime_visible_parameter_annotations = NULL;
1741 int runtime_visible_parameter_annotations_length = 0;
1742 u1* runtime_invisible_parameter_annotations = NULL;
1743 int runtime_invisible_parameter_annotations_length = 0;
1744 u1* annotation_default = NULL;
1745 int annotation_default_length = 0;
1747 // Parse code and exceptions attribute
1748 u2 method_attributes_count = cfs->get_u2_fast();
1749 while (method_attributes_count--) {
1750 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1751 u2 method_attribute_name_index = cfs->get_u2_fast();
1752 u4 method_attribute_length = cfs->get_u4_fast();
1753 check_property(
1754 valid_cp_range(method_attribute_name_index, cp_size) &&
1755 cp->tag_at(method_attribute_name_index).is_utf8(),
1756 "Invalid method attribute name index %u in class file %s",
1757 method_attribute_name_index, CHECK_(nullHandle));
1759 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1760 if (method_attribute_name == vmSymbols::tag_code()) {
1761 // Parse Code attribute
1762 if (_need_verify) {
1763 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1764 "Code attribute in native or abstract methods in class file %s",
1765 CHECK_(nullHandle));
1766 }
1767 if (parsed_code_attribute) {
1768 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1769 }
1770 parsed_code_attribute = true;
1772 // Stack size, locals size, and code size
1773 if (_major_version == 45 && _minor_version <= 2) {
1774 cfs->guarantee_more(4, CHECK_(nullHandle));
1775 max_stack = cfs->get_u1_fast();
1776 max_locals = cfs->get_u1_fast();
1777 code_length = cfs->get_u2_fast();
1778 } else {
1779 cfs->guarantee_more(8, CHECK_(nullHandle));
1780 max_stack = cfs->get_u2_fast();
1781 max_locals = cfs->get_u2_fast();
1782 code_length = cfs->get_u4_fast();
1783 }
1784 if (_need_verify) {
1785 guarantee_property(args_size <= max_locals,
1786 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1787 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1788 "Invalid method Code length %u in class file %s",
1789 code_length, CHECK_(nullHandle));
1790 }
1791 // Code pointer
1792 code_start = cfs->get_u1_buffer();
1793 assert(code_start != NULL, "null code start");
1794 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1795 cfs->skip_u1_fast(code_length);
1797 // Exception handler table
1798 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1799 exception_table_length = cfs->get_u2_fast();
1800 if (exception_table_length > 0) {
1801 exception_handlers =
1802 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1803 }
1805 // Parse additional attributes in code attribute
1806 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1807 u2 code_attributes_count = cfs->get_u2_fast();
1809 unsigned int calculated_attribute_length = 0;
1811 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1812 calculated_attribute_length =
1813 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1814 } else {
1815 // max_stack, locals and length are smaller in pre-version 45.2 classes
1816 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1817 }
1818 calculated_attribute_length +=
1819 code_length +
1820 sizeof(exception_table_length) +
1821 sizeof(code_attributes_count) +
1822 exception_table_length *
1823 ( sizeof(u2) + // start_pc
1824 sizeof(u2) + // end_pc
1825 sizeof(u2) + // handler_pc
1826 sizeof(u2) ); // catch_type_index
1828 while (code_attributes_count--) {
1829 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1830 u2 code_attribute_name_index = cfs->get_u2_fast();
1831 u4 code_attribute_length = cfs->get_u4_fast();
1832 calculated_attribute_length += code_attribute_length +
1833 sizeof(code_attribute_name_index) +
1834 sizeof(code_attribute_length);
1835 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1836 cp->tag_at(code_attribute_name_index).is_utf8(),
1837 "Invalid code attribute name index %u in class file %s",
1838 code_attribute_name_index,
1839 CHECK_(nullHandle));
1840 if (LoadLineNumberTables &&
1841 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1842 // Parse and compress line number table
1843 parse_linenumber_table(code_attribute_length, code_length,
1844 &linenumber_table, CHECK_(nullHandle));
1846 } else if (LoadLocalVariableTables &&
1847 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1848 // Parse local variable table
1849 if (!lvt_allocated) {
1850 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1851 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1852 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1853 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1854 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1855 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1856 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1857 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1858 lvt_allocated = true;
1859 }
1860 if (lvt_cnt == max_lvt_cnt) {
1861 max_lvt_cnt <<= 1;
1862 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1863 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1864 }
1865 localvariable_table_start[lvt_cnt] =
1866 parse_localvariable_table(code_length,
1867 max_locals,
1868 code_attribute_length,
1869 cp,
1870 &localvariable_table_length[lvt_cnt],
1871 false, // is not LVTT
1872 CHECK_(nullHandle));
1873 total_lvt_length += localvariable_table_length[lvt_cnt];
1874 lvt_cnt++;
1875 } else if (LoadLocalVariableTypeTables &&
1876 _major_version >= JAVA_1_5_VERSION &&
1877 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1878 if (!lvt_allocated) {
1879 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1880 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1881 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1882 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1883 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1884 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1885 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1886 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1887 lvt_allocated = true;
1888 }
1889 // Parse local variable type table
1890 if (lvtt_cnt == max_lvtt_cnt) {
1891 max_lvtt_cnt <<= 1;
1892 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1893 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1894 }
1895 localvariable_type_table_start[lvtt_cnt] =
1896 parse_localvariable_table(code_length,
1897 max_locals,
1898 code_attribute_length,
1899 cp,
1900 &localvariable_type_table_length[lvtt_cnt],
1901 true, // is LVTT
1902 CHECK_(nullHandle));
1903 lvtt_cnt++;
1904 } else if (UseSplitVerifier &&
1905 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1906 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1907 // Stack map is only needed by the new verifier in JDK1.5.
1908 if (parsed_stackmap_attribute) {
1909 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1910 }
1911 typeArrayOop sm =
1912 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1913 stackmap_data = typeArrayHandle(THREAD, sm);
1914 parsed_stackmap_attribute = true;
1915 } else {
1916 // Skip unknown attributes
1917 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1918 }
1919 }
1920 // check method attribute length
1921 if (_need_verify) {
1922 guarantee_property(method_attribute_length == calculated_attribute_length,
1923 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1924 }
1925 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1926 // Parse Exceptions attribute
1927 if (parsed_checked_exceptions_attribute) {
1928 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1929 }
1930 parsed_checked_exceptions_attribute = true;
1931 checked_exceptions_start =
1932 parse_checked_exceptions(&checked_exceptions_length,
1933 method_attribute_length,
1934 cp, CHECK_(nullHandle));
1935 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1936 if (method_attribute_length != 0) {
1937 classfile_parse_error(
1938 "Invalid Synthetic method attribute length %u in class file %s",
1939 method_attribute_length, CHECK_(nullHandle));
1940 }
1941 // Should we check that there hasn't already been a synthetic attribute?
1942 access_flags.set_is_synthetic();
1943 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1944 if (method_attribute_length != 0) {
1945 classfile_parse_error(
1946 "Invalid Deprecated method attribute length %u in class file %s",
1947 method_attribute_length, CHECK_(nullHandle));
1948 }
1949 } else if (_major_version >= JAVA_1_5_VERSION) {
1950 if (method_attribute_name == vmSymbols::tag_signature()) {
1951 if (method_attribute_length != 2) {
1952 classfile_parse_error(
1953 "Invalid Signature attribute length %u in class file %s",
1954 method_attribute_length, CHECK_(nullHandle));
1955 }
1956 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1957 generic_signature_index = cfs->get_u2_fast();
1958 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1959 runtime_visible_annotations_length = method_attribute_length;
1960 runtime_visible_annotations = cfs->get_u1_buffer();
1961 assert(runtime_visible_annotations != NULL, "null visible annotations");
1962 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1963 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1964 runtime_invisible_annotations_length = method_attribute_length;
1965 runtime_invisible_annotations = cfs->get_u1_buffer();
1966 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1967 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1968 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1969 runtime_visible_parameter_annotations_length = method_attribute_length;
1970 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1971 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1972 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1973 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1974 runtime_invisible_parameter_annotations_length = method_attribute_length;
1975 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1976 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1977 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1978 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1979 annotation_default_length = method_attribute_length;
1980 annotation_default = cfs->get_u1_buffer();
1981 assert(annotation_default != NULL, "null annotation default");
1982 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1983 } else {
1984 // Skip unknown attributes
1985 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1986 }
1987 } else {
1988 // Skip unknown attributes
1989 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1990 }
1991 }
1993 if (linenumber_table != NULL) {
1994 linenumber_table->write_terminator();
1995 linenumber_table_length = linenumber_table->position();
1996 }
1998 // Make sure there's at least one Code attribute in non-native/non-abstract method
1999 if (_need_verify) {
2000 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2001 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2002 }
2004 // All sizing information for a methodOop is finally available, now create it
2005 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
2006 total_lvt_length, checked_exceptions_length,
2007 oopDesc::IsSafeConc, CHECK_(nullHandle));
2008 methodHandle m (THREAD, m_oop);
2010 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
2012 // Fill in information from fixed part (access_flags already set)
2013 m->set_constants(cp());
2014 m->set_name_index(name_index);
2015 m->set_signature_index(signature_index);
2016 m->set_generic_signature_index(generic_signature_index);
2017 #ifdef CC_INTERP
2018 // hmm is there a gc issue here??
2019 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2020 m->set_result_index(rtf.type());
2021 #endif
2023 if (args_size >= 0) {
2024 m->set_size_of_parameters(args_size);
2025 } else {
2026 m->compute_size_of_parameters(THREAD);
2027 }
2028 #ifdef ASSERT
2029 if (args_size >= 0) {
2030 m->compute_size_of_parameters(THREAD);
2031 assert(args_size == m->size_of_parameters(), "");
2032 }
2033 #endif
2035 // Fill in code attribute information
2036 m->set_max_stack(max_stack);
2037 m->set_max_locals(max_locals);
2038 m->constMethod()->set_stackmap_data(stackmap_data());
2040 /**
2041 * The exception_table field is the flag used to indicate
2042 * that the methodOop and it's associated constMethodOop are partially
2043 * initialized and thus are exempt from pre/post GC verification. Once
2044 * the field is set, the oops are considered fully initialized so make
2045 * sure that the oops can pass verification when this field is set.
2046 */
2047 m->set_exception_table(exception_handlers());
2049 // Copy byte codes
2050 m->set_code(code_start);
2052 // Copy line number table
2053 if (linenumber_table != NULL) {
2054 memcpy(m->compressed_linenumber_table(),
2055 linenumber_table->buffer(), linenumber_table_length);
2056 }
2058 // Copy checked exceptions
2059 if (checked_exceptions_length > 0) {
2060 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2061 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2062 }
2064 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2065 *
2066 * Rules for LVT's and LVTT's are:
2067 * - There can be any number of LVT's and LVTT's.
2068 * - If there are n LVT's, it is the same as if there was just
2069 * one LVT containing all the entries from the n LVT's.
2070 * - There may be no more than one LVT entry per local variable.
2071 * Two LVT entries are 'equal' if these fields are the same:
2072 * start_pc, length, name, slot
2073 * - There may be no more than one LVTT entry per each LVT entry.
2074 * Each LVTT entry has to match some LVT entry.
2075 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2076 */
2077 if (total_lvt_length > 0) {
2078 int tbl_no, idx;
2080 promoted_flags->set_has_localvariable_table();
2082 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2083 initialize_hashtable(lvt_Hash);
2085 // To fill LocalVariableTable in
2086 Classfile_LVT_Element* cf_lvt;
2087 LocalVariableTableElement* lvt = m->localvariable_table_start();
2089 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2090 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2091 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2092 copy_lvt_element(&cf_lvt[idx], lvt);
2093 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2094 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2095 && _need_verify
2096 && _major_version >= JAVA_1_5_VERSION ) {
2097 clear_hashtable(lvt_Hash);
2098 classfile_parse_error("Duplicated LocalVariableTable attribute "
2099 "entry for '%s' in class file %s",
2100 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2101 CHECK_(nullHandle));
2102 }
2103 }
2104 }
2106 // To merge LocalVariableTable and LocalVariableTypeTable
2107 Classfile_LVT_Element* cf_lvtt;
2108 LocalVariableTableElement lvtt_elem;
2110 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2111 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2112 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2113 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2114 int index = hash(&lvtt_elem);
2115 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2116 if (entry == NULL) {
2117 if (_need_verify) {
2118 clear_hashtable(lvt_Hash);
2119 classfile_parse_error("LVTT entry for '%s' in class file %s "
2120 "does not match any LVT entry",
2121 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2122 CHECK_(nullHandle));
2123 }
2124 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2125 clear_hashtable(lvt_Hash);
2126 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2127 "entry for '%s' in class file %s",
2128 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2129 CHECK_(nullHandle));
2130 } else {
2131 // to add generic signatures into LocalVariableTable
2132 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2133 }
2134 }
2135 }
2136 clear_hashtable(lvt_Hash);
2137 }
2139 *method_annotations = assemble_annotations(runtime_visible_annotations,
2140 runtime_visible_annotations_length,
2141 runtime_invisible_annotations,
2142 runtime_invisible_annotations_length,
2143 CHECK_(nullHandle));
2144 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2145 runtime_visible_parameter_annotations_length,
2146 runtime_invisible_parameter_annotations,
2147 runtime_invisible_parameter_annotations_length,
2148 CHECK_(nullHandle));
2149 *method_default_annotations = assemble_annotations(annotation_default,
2150 annotation_default_length,
2151 NULL,
2152 0,
2153 CHECK_(nullHandle));
2155 if (name == vmSymbols::finalize_method_name() &&
2156 signature == vmSymbols::void_method_signature()) {
2157 if (m->is_empty_method()) {
2158 _has_empty_finalizer = true;
2159 } else {
2160 _has_finalizer = true;
2161 }
2162 }
2163 if (name == vmSymbols::object_initializer_name() &&
2164 signature == vmSymbols::void_method_signature() &&
2165 m->is_vanilla_constructor()) {
2166 _has_vanilla_constructor = true;
2167 }
2169 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2170 m->is_method_handle_adapter())) {
2171 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2172 "Method handle invokers must be defined internally to the VM", nullHandle);
2173 }
2175 return m;
2176 }
2179 // The promoted_flags parameter is used to pass relevant access_flags
2180 // from the methods back up to the containing klass. These flag values
2181 // are added to klass's access_flags.
2183 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2184 AccessFlags* promoted_flags,
2185 bool* has_final_method,
2186 objArrayOop* methods_annotations_oop,
2187 objArrayOop* methods_parameter_annotations_oop,
2188 objArrayOop* methods_default_annotations_oop,
2189 TRAPS) {
2190 ClassFileStream* cfs = stream();
2191 objArrayHandle nullHandle;
2192 typeArrayHandle method_annotations;
2193 typeArrayHandle method_parameter_annotations;
2194 typeArrayHandle method_default_annotations;
2195 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2196 u2 length = cfs->get_u2_fast();
2197 if (length == 0) {
2198 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2199 } else {
2200 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2201 objArrayHandle methods(THREAD, m);
2202 HandleMark hm(THREAD);
2203 objArrayHandle methods_annotations;
2204 objArrayHandle methods_parameter_annotations;
2205 objArrayHandle methods_default_annotations;
2206 for (int index = 0; index < length; index++) {
2207 methodHandle method = parse_method(cp, is_interface,
2208 promoted_flags,
2209 &method_annotations,
2210 &method_parameter_annotations,
2211 &method_default_annotations,
2212 CHECK_(nullHandle));
2213 if (method->is_final()) {
2214 *has_final_method = true;
2215 }
2216 methods->obj_at_put(index, method());
2217 if (method_annotations.not_null()) {
2218 if (methods_annotations.is_null()) {
2219 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2220 methods_annotations = objArrayHandle(THREAD, md);
2221 }
2222 methods_annotations->obj_at_put(index, method_annotations());
2223 }
2224 if (method_parameter_annotations.not_null()) {
2225 if (methods_parameter_annotations.is_null()) {
2226 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2227 methods_parameter_annotations = objArrayHandle(THREAD, md);
2228 }
2229 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2230 }
2231 if (method_default_annotations.not_null()) {
2232 if (methods_default_annotations.is_null()) {
2233 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2234 methods_default_annotations = objArrayHandle(THREAD, md);
2235 }
2236 methods_default_annotations->obj_at_put(index, method_default_annotations());
2237 }
2238 }
2239 if (_need_verify && length > 1) {
2240 // Check duplicated methods
2241 ResourceMark rm(THREAD);
2242 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2243 THREAD, NameSigHash*, HASH_ROW_SIZE);
2244 initialize_hashtable(names_and_sigs);
2245 bool dup = false;
2246 {
2247 debug_only(No_Safepoint_Verifier nsv;)
2248 for (int i = 0; i < length; i++) {
2249 methodOop m = (methodOop)methods->obj_at(i);
2250 // If no duplicates, add name/signature in hashtable names_and_sigs.
2251 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2252 dup = true;
2253 break;
2254 }
2255 }
2256 }
2257 if (dup) {
2258 classfile_parse_error("Duplicate method name&signature in class file %s",
2259 CHECK_(nullHandle));
2260 }
2261 }
2263 *methods_annotations_oop = methods_annotations();
2264 *methods_parameter_annotations_oop = methods_parameter_annotations();
2265 *methods_default_annotations_oop = methods_default_annotations();
2267 return methods;
2268 }
2269 }
2272 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2273 objArrayHandle methods_annotations,
2274 objArrayHandle methods_parameter_annotations,
2275 objArrayHandle methods_default_annotations,
2276 TRAPS) {
2277 typeArrayHandle nullHandle;
2278 int length = methods()->length();
2279 // If JVMTI original method ordering or sharing is enabled we have to
2280 // remember the original class file ordering.
2281 // We temporarily use the vtable_index field in the methodOop to store the
2282 // class file index, so we can read in after calling qsort.
2283 // Put the method ordering in the shared archive.
2284 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2285 for (int index = 0; index < length; index++) {
2286 methodOop m = methodOop(methods->obj_at(index));
2287 assert(!m->valid_vtable_index(), "vtable index should not be set");
2288 m->set_vtable_index(index);
2289 }
2290 }
2291 // Sort method array by ascending method name (for faster lookups & vtable construction)
2292 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2293 methodOopDesc::sort_methods(methods(),
2294 methods_annotations(),
2295 methods_parameter_annotations(),
2296 methods_default_annotations());
2298 // If JVMTI original method ordering or sharing is enabled construct int
2299 // array remembering the original ordering
2300 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2301 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2302 typeArrayHandle method_ordering(THREAD, new_ordering);
2303 for (int index = 0; index < length; index++) {
2304 methodOop m = methodOop(methods->obj_at(index));
2305 int old_index = m->vtable_index();
2306 assert(old_index >= 0 && old_index < length, "invalid method index");
2307 method_ordering->int_at_put(index, old_index);
2308 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2309 }
2310 return method_ordering;
2311 } else {
2312 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2313 }
2314 }
2317 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2318 ClassFileStream* cfs = stream();
2319 cfs->guarantee_more(2, CHECK); // sourcefile_index
2320 u2 sourcefile_index = cfs->get_u2_fast();
2321 check_property(
2322 valid_cp_range(sourcefile_index, cp->length()) &&
2323 cp->tag_at(sourcefile_index).is_utf8(),
2324 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2325 sourcefile_index, CHECK);
2326 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2327 }
2331 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2332 instanceKlassHandle k,
2333 int length, TRAPS) {
2334 ClassFileStream* cfs = stream();
2335 u1* sde_buffer = cfs->get_u1_buffer();
2336 assert(sde_buffer != NULL, "null sde buffer");
2338 // Don't bother storing it if there is no way to retrieve it
2339 if (JvmtiExport::can_get_source_debug_extension()) {
2340 // Optimistically assume that only 1 byte UTF format is used
2341 // (common case)
2342 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2343 k->set_source_debug_extension(sde_symbol);
2344 // Note that set_source_debug_extension() increments the reference count
2345 // for its copy of the Symbol*, so use a TempNewSymbol here.
2346 }
2347 // Got utf8 string, set stream position forward
2348 cfs->skip_u1(length, CHECK);
2349 }
2352 // Inner classes can be static, private or protected (classic VM does this)
2353 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2355 // Return number of classes in the inner classes attribute table
2356 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2357 bool parsed_enclosingmethod_attribute,
2358 u2 enclosing_method_class_index,
2359 u2 enclosing_method_method_index,
2360 constantPoolHandle cp,
2361 instanceKlassHandle k, TRAPS) {
2362 ClassFileStream* cfs = stream();
2363 u1* current_mark = cfs->current();
2364 u2 length = 0;
2365 if (inner_classes_attribute_start != NULL) {
2366 cfs->set_current(inner_classes_attribute_start);
2367 cfs->guarantee_more(2, CHECK_0); // length
2368 length = cfs->get_u2_fast();
2369 }
2371 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2372 // method data:
2373 // [inner_class_info_index,
2374 // outer_class_info_index,
2375 // inner_name_index,
2376 // inner_class_access_flags,
2377 // ...
2378 // enclosing_method_class_index,
2379 // enclosing_method_method_index]
2380 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2381 typeArrayOop ic = oopFactory::new_permanent_shortArray(size, CHECK_0);
2382 typeArrayHandle inner_classes(THREAD, ic);
2383 int index = 0;
2384 int cp_size = cp->length();
2385 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2386 for (int n = 0; n < length; n++) {
2387 // Inner class index
2388 u2 inner_class_info_index = cfs->get_u2_fast();
2389 check_property(
2390 inner_class_info_index == 0 ||
2391 (valid_cp_range(inner_class_info_index, cp_size) &&
2392 is_klass_reference(cp, inner_class_info_index)),
2393 "inner_class_info_index %u has bad constant type in class file %s",
2394 inner_class_info_index, CHECK_0);
2395 // Outer class index
2396 u2 outer_class_info_index = cfs->get_u2_fast();
2397 check_property(
2398 outer_class_info_index == 0 ||
2399 (valid_cp_range(outer_class_info_index, cp_size) &&
2400 is_klass_reference(cp, outer_class_info_index)),
2401 "outer_class_info_index %u has bad constant type in class file %s",
2402 outer_class_info_index, CHECK_0);
2403 // Inner class name
2404 u2 inner_name_index = cfs->get_u2_fast();
2405 check_property(
2406 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2407 cp->tag_at(inner_name_index).is_utf8()),
2408 "inner_name_index %u has bad constant type in class file %s",
2409 inner_name_index, CHECK_0);
2410 if (_need_verify) {
2411 guarantee_property(inner_class_info_index != outer_class_info_index,
2412 "Class is both outer and inner class in class file %s", CHECK_0);
2413 }
2414 // Access flags
2415 AccessFlags inner_access_flags;
2416 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2417 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2418 // Set abstract bit for old class files for backward compatibility
2419 flags |= JVM_ACC_ABSTRACT;
2420 }
2421 verify_legal_class_modifiers(flags, CHECK_0);
2422 inner_access_flags.set_flags(flags);
2424 inner_classes->short_at_put(index++, inner_class_info_index);
2425 inner_classes->short_at_put(index++, outer_class_info_index);
2426 inner_classes->short_at_put(index++, inner_name_index);
2427 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2428 }
2430 // 4347400: make sure there's no duplicate entry in the classes array
2431 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2432 for(int i = 0; i < length * 4; i += 4) {
2433 for(int j = i + 4; j < length * 4; j += 4) {
2434 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2435 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2436 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2437 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2438 "Duplicate entry in InnerClasses in class file %s",
2439 CHECK_0);
2440 }
2441 }
2442 }
2444 // Set EnclosingMethod class and method indexes.
2445 if (parsed_enclosingmethod_attribute) {
2446 inner_classes->short_at_put(index++, enclosing_method_class_index);
2447 inner_classes->short_at_put(index++, enclosing_method_method_index);
2448 }
2449 assert(index == size, "wrong size");
2451 // Update instanceKlass with inner class info.
2452 k->set_inner_classes(inner_classes());
2454 // Restore buffer's current position.
2455 cfs->set_current(current_mark);
2457 return length;
2458 }
2460 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2461 k->set_is_synthetic();
2462 }
2464 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2465 ClassFileStream* cfs = stream();
2466 u2 signature_index = cfs->get_u2(CHECK);
2467 check_property(
2468 valid_cp_range(signature_index, cp->length()) &&
2469 cp->tag_at(signature_index).is_utf8(),
2470 "Invalid constant pool index %u in Signature attribute in class file %s",
2471 signature_index, CHECK);
2472 k->set_generic_signature(cp->symbol_at(signature_index));
2473 }
2475 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2476 u4 attribute_byte_length, TRAPS) {
2477 ClassFileStream* cfs = stream();
2478 u1* current_start = cfs->current();
2480 cfs->guarantee_more(2, CHECK); // length
2481 int attribute_array_length = cfs->get_u2_fast();
2483 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2484 "Short length on BootstrapMethods in class file %s",
2485 CHECK);
2487 // The attribute contains a counted array of counted tuples of shorts,
2488 // represending bootstrap specifiers:
2489 // length*{bootstrap_method_index, argument_count*{argument_index}}
2490 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2491 // operand_count = number of shorts in attr, except for leading length
2493 // The attribute is copied into a short[] array.
2494 // The array begins with a series of short[2] pairs, one for each tuple.
2495 int index_size = (attribute_array_length * 2);
2497 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2498 typeArrayHandle operands(THREAD, operands_oop);
2499 operands_oop = NULL; // tidy
2501 int operand_fill_index = index_size;
2502 int cp_size = cp->length();
2504 for (int n = 0; n < attribute_array_length; n++) {
2505 // Store a 32-bit offset into the header of the operand array.
2506 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2507 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2509 // Read a bootstrap specifier.
2510 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2511 u2 bootstrap_method_index = cfs->get_u2_fast();
2512 u2 argument_count = cfs->get_u2_fast();
2513 check_property(
2514 valid_cp_range(bootstrap_method_index, cp_size) &&
2515 cp->tag_at(bootstrap_method_index).is_method_handle(),
2516 "bootstrap_method_index %u has bad constant type in class file %s",
2517 bootstrap_method_index,
2518 CHECK);
2519 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2520 operands->short_at_put(operand_fill_index++, argument_count);
2522 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2523 for (int j = 0; j < argument_count; j++) {
2524 u2 argument_index = cfs->get_u2_fast();
2525 check_property(
2526 valid_cp_range(argument_index, cp_size) &&
2527 cp->tag_at(argument_index).is_loadable_constant(),
2528 "argument_index %u has bad constant type in class file %s",
2529 argument_index,
2530 CHECK);
2531 operands->short_at_put(operand_fill_index++, argument_index);
2532 }
2533 }
2535 assert(operand_fill_index == operands()->length(), "exact fill");
2536 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2538 u1* current_end = cfs->current();
2539 guarantee_property(current_end == current_start + attribute_byte_length,
2540 "Bad length on BootstrapMethods in class file %s",
2541 CHECK);
2543 cp->set_operands(operands());
2544 }
2547 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2548 ClassFileStream* cfs = stream();
2549 // Set inner classes attribute to default sentinel
2550 k->set_inner_classes(Universe::the_empty_short_array());
2551 cfs->guarantee_more(2, CHECK); // attributes_count
2552 u2 attributes_count = cfs->get_u2_fast();
2553 bool parsed_sourcefile_attribute = false;
2554 bool parsed_innerclasses_attribute = false;
2555 bool parsed_enclosingmethod_attribute = false;
2556 bool parsed_bootstrap_methods_attribute = false;
2557 u1* runtime_visible_annotations = NULL;
2558 int runtime_visible_annotations_length = 0;
2559 u1* runtime_invisible_annotations = NULL;
2560 int runtime_invisible_annotations_length = 0;
2561 u1* inner_classes_attribute_start = NULL;
2562 u4 inner_classes_attribute_length = 0;
2563 u2 enclosing_method_class_index = 0;
2564 u2 enclosing_method_method_index = 0;
2565 // Iterate over attributes
2566 while (attributes_count--) {
2567 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2568 u2 attribute_name_index = cfs->get_u2_fast();
2569 u4 attribute_length = cfs->get_u4_fast();
2570 check_property(
2571 valid_cp_range(attribute_name_index, cp->length()) &&
2572 cp->tag_at(attribute_name_index).is_utf8(),
2573 "Attribute name has bad constant pool index %u in class file %s",
2574 attribute_name_index, CHECK);
2575 Symbol* tag = cp->symbol_at(attribute_name_index);
2576 if (tag == vmSymbols::tag_source_file()) {
2577 // Check for SourceFile tag
2578 if (_need_verify) {
2579 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2580 }
2581 if (parsed_sourcefile_attribute) {
2582 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2583 } else {
2584 parsed_sourcefile_attribute = true;
2585 }
2586 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2587 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2588 // Check for SourceDebugExtension tag
2589 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2590 } else if (tag == vmSymbols::tag_inner_classes()) {
2591 // Check for InnerClasses tag
2592 if (parsed_innerclasses_attribute) {
2593 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2594 } else {
2595 parsed_innerclasses_attribute = true;
2596 }
2597 inner_classes_attribute_start = cfs->get_u1_buffer();
2598 inner_classes_attribute_length = attribute_length;
2599 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2600 } else if (tag == vmSymbols::tag_synthetic()) {
2601 // Check for Synthetic tag
2602 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2603 if (attribute_length != 0) {
2604 classfile_parse_error(
2605 "Invalid Synthetic classfile attribute length %u in class file %s",
2606 attribute_length, CHECK);
2607 }
2608 parse_classfile_synthetic_attribute(cp, k, CHECK);
2609 } else if (tag == vmSymbols::tag_deprecated()) {
2610 // Check for Deprecatd tag - 4276120
2611 if (attribute_length != 0) {
2612 classfile_parse_error(
2613 "Invalid Deprecated classfile attribute length %u in class file %s",
2614 attribute_length, CHECK);
2615 }
2616 } else if (_major_version >= JAVA_1_5_VERSION) {
2617 if (tag == vmSymbols::tag_signature()) {
2618 if (attribute_length != 2) {
2619 classfile_parse_error(
2620 "Wrong Signature attribute length %u in class file %s",
2621 attribute_length, CHECK);
2622 }
2623 parse_classfile_signature_attribute(cp, k, CHECK);
2624 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2625 runtime_visible_annotations_length = attribute_length;
2626 runtime_visible_annotations = cfs->get_u1_buffer();
2627 assert(runtime_visible_annotations != NULL, "null visible annotations");
2628 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2629 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2630 runtime_invisible_annotations_length = attribute_length;
2631 runtime_invisible_annotations = cfs->get_u1_buffer();
2632 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2633 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2634 } else if (tag == vmSymbols::tag_enclosing_method()) {
2635 if (parsed_enclosingmethod_attribute) {
2636 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2637 } else {
2638 parsed_enclosingmethod_attribute = true;
2639 }
2640 cfs->guarantee_more(4, CHECK); // class_index, method_index
2641 enclosing_method_class_index = cfs->get_u2_fast();
2642 enclosing_method_method_index = cfs->get_u2_fast();
2643 if (enclosing_method_class_index == 0) {
2644 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2645 }
2646 // Validate the constant pool indices and types
2647 if (!cp->is_within_bounds(enclosing_method_class_index) ||
2648 !is_klass_reference(cp, enclosing_method_class_index)) {
2649 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2650 }
2651 if (enclosing_method_method_index != 0 &&
2652 (!cp->is_within_bounds(enclosing_method_method_index) ||
2653 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2654 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2655 }
2656 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2657 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2658 if (parsed_bootstrap_methods_attribute)
2659 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2660 parsed_bootstrap_methods_attribute = true;
2661 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2662 } else {
2663 // Unknown attribute
2664 cfs->skip_u1(attribute_length, CHECK);
2665 }
2666 } else {
2667 // Unknown attribute
2668 cfs->skip_u1(attribute_length, CHECK);
2669 }
2670 }
2671 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2672 runtime_visible_annotations_length,
2673 runtime_invisible_annotations,
2674 runtime_invisible_annotations_length,
2675 CHECK);
2676 k->set_class_annotations(annotations());
2678 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2679 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2680 inner_classes_attribute_start,
2681 parsed_innerclasses_attribute,
2682 enclosing_method_class_index,
2683 enclosing_method_method_index,
2684 cp, k, CHECK);
2685 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2686 guarantee_property(
2687 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2688 "Wrong InnerClasses attribute length in class file %s", CHECK);
2689 }
2690 }
2692 if (_max_bootstrap_specifier_index >= 0) {
2693 guarantee_property(parsed_bootstrap_methods_attribute,
2694 "Missing BootstrapMethods attribute in class file %s", CHECK);
2695 }
2696 }
2699 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2700 int runtime_visible_annotations_length,
2701 u1* runtime_invisible_annotations,
2702 int runtime_invisible_annotations_length, TRAPS) {
2703 typeArrayHandle annotations;
2704 if (runtime_visible_annotations != NULL ||
2705 runtime_invisible_annotations != NULL) {
2706 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2707 runtime_invisible_annotations_length, CHECK_(annotations));
2708 annotations = typeArrayHandle(THREAD, anno);
2709 if (runtime_visible_annotations != NULL) {
2710 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2711 }
2712 if (runtime_invisible_annotations != NULL) {
2713 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2714 }
2715 }
2716 return annotations;
2717 }
2720 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2721 Handle class_loader,
2722 Handle protection_domain,
2723 KlassHandle host_klass,
2724 GrowableArray<Handle>* cp_patches,
2725 TempNewSymbol& parsed_name,
2726 bool verify,
2727 TRAPS) {
2728 // When a retransformable agent is attached, JVMTI caches the
2729 // class bytes that existed before the first retransformation.
2730 // If RedefineClasses() was used before the retransformable
2731 // agent attached, then the cached class bytes may not be the
2732 // original class bytes.
2733 unsigned char *cached_class_file_bytes = NULL;
2734 jint cached_class_file_length;
2736 ClassFileStream* cfs = stream();
2737 // Timing
2738 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2739 JavaThread* jt = (JavaThread*) THREAD;
2741 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2742 ClassLoader::perf_class_parse_selftime(),
2743 NULL,
2744 jt->get_thread_stat()->perf_recursion_counts_addr(),
2745 jt->get_thread_stat()->perf_timers_addr(),
2746 PerfClassTraceTime::PARSE_CLASS);
2748 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2749 _max_bootstrap_specifier_index = -1;
2751 if (JvmtiExport::should_post_class_file_load_hook()) {
2752 // Get the cached class file bytes (if any) from the class that
2753 // is being redefined or retransformed. We use jvmti_thread_state()
2754 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
2755 // a JvmtiThreadState any earlier than necessary. This will help
2756 // avoid the bug described by 7126851.
2757 JvmtiThreadState *state = jt->jvmti_thread_state();
2758 if (state != NULL) {
2759 KlassHandle *h_class_being_redefined =
2760 state->get_class_being_redefined();
2761 if (h_class_being_redefined != NULL) {
2762 instanceKlassHandle ikh_class_being_redefined =
2763 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
2764 cached_class_file_bytes =
2765 ikh_class_being_redefined->get_cached_class_file_bytes();
2766 cached_class_file_length =
2767 ikh_class_being_redefined->get_cached_class_file_len();
2768 }
2769 }
2771 unsigned char* ptr = cfs->buffer();
2772 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2774 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2775 &ptr, &end_ptr,
2776 &cached_class_file_bytes,
2777 &cached_class_file_length);
2779 if (ptr != cfs->buffer()) {
2780 // JVMTI agent has modified class file data.
2781 // Set new class file stream using JVMTI agent modified
2782 // class file data.
2783 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2784 set_stream(cfs);
2785 }
2786 }
2788 _host_klass = host_klass;
2789 _cp_patches = cp_patches;
2791 instanceKlassHandle nullHandle;
2793 // Figure out whether we can skip format checking (matching classic VM behavior)
2794 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2796 // Set the verify flag in stream
2797 cfs->set_verify(_need_verify);
2799 // Save the class file name for easier error message printing.
2800 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2802 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2803 // Magic value
2804 u4 magic = cfs->get_u4_fast();
2805 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2806 "Incompatible magic value %u in class file %s",
2807 magic, CHECK_(nullHandle));
2809 // Version numbers
2810 u2 minor_version = cfs->get_u2_fast();
2811 u2 major_version = cfs->get_u2_fast();
2813 // Check version numbers - we check this even with verifier off
2814 if (!is_supported_version(major_version, minor_version)) {
2815 if (name == NULL) {
2816 Exceptions::fthrow(
2817 THREAD_AND_LOCATION,
2818 vmSymbols::java_lang_UnsupportedClassVersionError(),
2819 "Unsupported major.minor version %u.%u",
2820 major_version,
2821 minor_version);
2822 } else {
2823 ResourceMark rm(THREAD);
2824 Exceptions::fthrow(
2825 THREAD_AND_LOCATION,
2826 vmSymbols::java_lang_UnsupportedClassVersionError(),
2827 "%s : Unsupported major.minor version %u.%u",
2828 name->as_C_string(),
2829 major_version,
2830 minor_version);
2831 }
2832 return nullHandle;
2833 }
2835 _major_version = major_version;
2836 _minor_version = minor_version;
2839 // Check if verification needs to be relaxed for this class file
2840 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2841 _relax_verify = Verifier::relax_verify_for(class_loader());
2843 // Constant pool
2844 constantPoolHandle cp = parse_constant_pool(class_loader, CHECK_(nullHandle));
2845 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2847 int cp_size = cp->length();
2849 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2851 // Access flags
2852 AccessFlags access_flags;
2853 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2855 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2856 // Set abstract bit for old class files for backward compatibility
2857 flags |= JVM_ACC_ABSTRACT;
2858 }
2859 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2860 access_flags.set_flags(flags);
2862 // This class and superclass
2863 instanceKlassHandle super_klass;
2864 u2 this_class_index = cfs->get_u2_fast();
2865 check_property(
2866 valid_cp_range(this_class_index, cp_size) &&
2867 cp->tag_at(this_class_index).is_unresolved_klass(),
2868 "Invalid this class index %u in constant pool in class file %s",
2869 this_class_index, CHECK_(nullHandle));
2871 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2872 assert(class_name != NULL, "class_name can't be null");
2874 // It's important to set parsed_name *before* resolving the super class.
2875 // (it's used for cleanup by the caller if parsing fails)
2876 parsed_name = class_name;
2877 // parsed_name is returned and can be used if there's an error, so add to
2878 // its reference count. Caller will decrement the refcount.
2879 parsed_name->increment_refcount();
2881 // Update _class_name which could be null previously to be class_name
2882 _class_name = class_name;
2884 // Don't need to check whether this class name is legal or not.
2885 // It has been checked when constant pool is parsed.
2886 // However, make sure it is not an array type.
2887 if (_need_verify) {
2888 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2889 "Bad class name in class file %s",
2890 CHECK_(nullHandle));
2891 }
2893 klassOop preserve_this_klass; // for storing result across HandleMark
2895 // release all handles when parsing is done
2896 { HandleMark hm(THREAD);
2898 // Checks if name in class file matches requested name
2899 if (name != NULL && class_name != name) {
2900 ResourceMark rm(THREAD);
2901 Exceptions::fthrow(
2902 THREAD_AND_LOCATION,
2903 vmSymbols::java_lang_NoClassDefFoundError(),
2904 "%s (wrong name: %s)",
2905 name->as_C_string(),
2906 class_name->as_C_string()
2907 );
2908 return nullHandle;
2909 }
2911 if (TraceClassLoadingPreorder) {
2912 tty->print("[Loading %s", name->as_klass_external_name());
2913 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2914 tty->print_cr("]");
2915 }
2917 u2 super_class_index = cfs->get_u2_fast();
2918 if (super_class_index == 0) {
2919 check_property(class_name == vmSymbols::java_lang_Object(),
2920 "Invalid superclass index %u in class file %s",
2921 super_class_index,
2922 CHECK_(nullHandle));
2923 } else {
2924 check_property(valid_cp_range(super_class_index, cp_size) &&
2925 is_klass_reference(cp, super_class_index),
2926 "Invalid superclass index %u in class file %s",
2927 super_class_index,
2928 CHECK_(nullHandle));
2929 // The class name should be legal because it is checked when parsing constant pool.
2930 // However, make sure it is not an array type.
2931 bool is_array = false;
2932 if (cp->tag_at(super_class_index).is_klass()) {
2933 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2934 if (_need_verify)
2935 is_array = super_klass->oop_is_array();
2936 } else if (_need_verify) {
2937 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2938 }
2939 if (_need_verify) {
2940 guarantee_property(!is_array,
2941 "Bad superclass name in class file %s", CHECK_(nullHandle));
2942 }
2943 }
2945 // Interfaces
2946 u2 itfs_len = cfs->get_u2_fast();
2947 objArrayHandle local_interfaces;
2948 if (itfs_len == 0) {
2949 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2950 } else {
2951 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2952 }
2954 u2 java_fields_count = 0;
2955 // Fields (offsets are filled in later)
2956 FieldAllocationCount fac;
2957 objArrayHandle fields_annotations;
2958 typeArrayHandle fields = parse_fields(class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
2959 &java_fields_count,
2960 CHECK_(nullHandle));
2961 // Methods
2962 bool has_final_method = false;
2963 AccessFlags promoted_flags;
2964 promoted_flags.set_flags(0);
2965 // These need to be oop pointers because they are allocated lazily
2966 // inside parse_methods inside a nested HandleMark
2967 objArrayOop methods_annotations_oop = NULL;
2968 objArrayOop methods_parameter_annotations_oop = NULL;
2969 objArrayOop methods_default_annotations_oop = NULL;
2970 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2971 &promoted_flags,
2972 &has_final_method,
2973 &methods_annotations_oop,
2974 &methods_parameter_annotations_oop,
2975 &methods_default_annotations_oop,
2976 CHECK_(nullHandle));
2978 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2979 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2980 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2982 // We check super class after class file is parsed and format is checked
2983 if (super_class_index > 0 && super_klass.is_null()) {
2984 Symbol* sk = cp->klass_name_at(super_class_index);
2985 if (access_flags.is_interface()) {
2986 // Before attempting to resolve the superclass, check for class format
2987 // errors not checked yet.
2988 guarantee_property(sk == vmSymbols::java_lang_Object(),
2989 "Interfaces must have java.lang.Object as superclass in class file %s",
2990 CHECK_(nullHandle));
2991 }
2992 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2993 sk,
2994 class_loader,
2995 protection_domain,
2996 true,
2997 CHECK_(nullHandle));
2999 KlassHandle kh (THREAD, k);
3000 super_klass = instanceKlassHandle(THREAD, kh());
3001 if (LinkWellKnownClasses) // my super class is well known to me
3002 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3003 }
3004 if (super_klass.not_null()) {
3005 if (super_klass->is_interface()) {
3006 ResourceMark rm(THREAD);
3007 Exceptions::fthrow(
3008 THREAD_AND_LOCATION,
3009 vmSymbols::java_lang_IncompatibleClassChangeError(),
3010 "class %s has interface %s as super class",
3011 class_name->as_klass_external_name(),
3012 super_klass->external_name()
3013 );
3014 return nullHandle;
3015 }
3016 // Make sure super class is not final
3017 if (super_klass->is_final()) {
3018 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3019 }
3020 }
3022 // Compute the transitive list of all unique interfaces implemented by this class
3023 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3025 // sort methods
3026 typeArrayHandle method_ordering = sort_methods(methods,
3027 methods_annotations,
3028 methods_parameter_annotations,
3029 methods_default_annotations,
3030 CHECK_(nullHandle));
3032 // promote flags from parse_methods() to the klass' flags
3033 access_flags.add_promoted_flags(promoted_flags.as_int());
3035 // Size of Java vtable (in words)
3036 int vtable_size = 0;
3037 int itable_size = 0;
3038 int num_miranda_methods = 0;
3040 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3041 num_miranda_methods,
3042 super_klass(),
3043 methods(),
3044 access_flags,
3045 class_loader,
3046 class_name,
3047 local_interfaces(),
3048 CHECK_(nullHandle));
3050 // Size of Java itable (in words)
3051 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3053 // Field size and offset computation
3054 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3055 #ifndef PRODUCT
3056 int orig_nonstatic_field_size = 0;
3057 #endif
3058 int static_field_size = 0;
3059 int next_static_oop_offset;
3060 int next_static_double_offset;
3061 int next_static_word_offset;
3062 int next_static_short_offset;
3063 int next_static_byte_offset;
3064 int next_static_type_offset;
3065 int next_nonstatic_oop_offset;
3066 int next_nonstatic_double_offset;
3067 int next_nonstatic_word_offset;
3068 int next_nonstatic_short_offset;
3069 int next_nonstatic_byte_offset;
3070 int next_nonstatic_type_offset;
3071 int first_nonstatic_oop_offset;
3072 int first_nonstatic_field_offset;
3073 int next_nonstatic_field_offset;
3075 // Calculate the starting byte offsets
3076 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3077 next_static_double_offset = next_static_oop_offset +
3078 (fac.count[STATIC_OOP] * heapOopSize);
3079 if ( fac.count[STATIC_DOUBLE] &&
3080 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3081 Universe::field_type_should_be_aligned(T_LONG)) ) {
3082 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3083 }
3085 next_static_word_offset = next_static_double_offset +
3086 (fac.count[STATIC_DOUBLE] * BytesPerLong);
3087 next_static_short_offset = next_static_word_offset +
3088 (fac.count[STATIC_WORD] * BytesPerInt);
3089 next_static_byte_offset = next_static_short_offset +
3090 (fac.count[STATIC_SHORT] * BytesPerShort);
3091 next_static_type_offset = align_size_up((next_static_byte_offset +
3092 fac.count[STATIC_BYTE] ), wordSize );
3093 static_field_size = (next_static_type_offset -
3094 next_static_oop_offset) / wordSize;
3096 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3097 nonstatic_field_size * heapOopSize;
3098 next_nonstatic_field_offset = first_nonstatic_field_offset;
3100 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE];
3101 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD];
3102 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT];
3103 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE];
3104 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP];
3106 bool super_has_nonstatic_fields =
3107 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3108 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3109 ((nonstatic_double_count + nonstatic_word_count +
3110 nonstatic_short_count + nonstatic_byte_count +
3111 nonstatic_oop_count) != 0);
3114 // Prepare list of oops for oop map generation.
3115 int* nonstatic_oop_offsets;
3116 unsigned int* nonstatic_oop_counts;
3117 unsigned int nonstatic_oop_map_count = 0;
3119 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3120 THREAD, int, nonstatic_oop_count + 1);
3121 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3122 THREAD, unsigned int, nonstatic_oop_count + 1);
3124 first_nonstatic_oop_offset = 0; // will be set for first oop field
3126 #ifndef PRODUCT
3127 if( PrintCompactFieldsSavings ) {
3128 next_nonstatic_double_offset = next_nonstatic_field_offset +
3129 (nonstatic_oop_count * heapOopSize);
3130 if ( nonstatic_double_count > 0 ) {
3131 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3132 }
3133 next_nonstatic_word_offset = next_nonstatic_double_offset +
3134 (nonstatic_double_count * BytesPerLong);
3135 next_nonstatic_short_offset = next_nonstatic_word_offset +
3136 (nonstatic_word_count * BytesPerInt);
3137 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3138 (nonstatic_short_count * BytesPerShort);
3139 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3140 nonstatic_byte_count ), heapOopSize );
3141 orig_nonstatic_field_size = nonstatic_field_size +
3142 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3143 }
3144 #endif
3145 bool compact_fields = CompactFields;
3146 int allocation_style = FieldsAllocationStyle;
3147 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3148 assert(false, "0 <= FieldsAllocationStyle <= 2");
3149 allocation_style = 1; // Optimistic
3150 }
3152 // The next classes have predefined hard-coded fields offsets
3153 // (see in JavaClasses::compute_hard_coded_offsets()).
3154 // Use default fields allocation order for them.
3155 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3156 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3157 class_name == vmSymbols::java_lang_Class() ||
3158 class_name == vmSymbols::java_lang_ClassLoader() ||
3159 class_name == vmSymbols::java_lang_ref_Reference() ||
3160 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3161 class_name == vmSymbols::java_lang_StackTraceElement() ||
3162 class_name == vmSymbols::java_lang_String() ||
3163 class_name == vmSymbols::java_lang_Throwable() ||
3164 class_name == vmSymbols::java_lang_Boolean() ||
3165 class_name == vmSymbols::java_lang_Character() ||
3166 class_name == vmSymbols::java_lang_Float() ||
3167 class_name == vmSymbols::java_lang_Double() ||
3168 class_name == vmSymbols::java_lang_Byte() ||
3169 class_name == vmSymbols::java_lang_Short() ||
3170 class_name == vmSymbols::java_lang_Integer() ||
3171 class_name == vmSymbols::java_lang_Long())) {
3172 allocation_style = 0; // Allocate oops first
3173 compact_fields = false; // Don't compact fields
3174 }
3176 if( allocation_style == 0 ) {
3177 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3178 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3179 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3180 (nonstatic_oop_count * heapOopSize);
3181 } else if( allocation_style == 1 ) {
3182 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3183 next_nonstatic_double_offset = next_nonstatic_field_offset;
3184 } else if( allocation_style == 2 ) {
3185 // Fields allocation: oops fields in super and sub classes are together.
3186 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3187 super_klass->nonstatic_oop_map_size() > 0 ) {
3188 int map_count = super_klass->nonstatic_oop_map_count();
3189 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3190 OopMapBlock* last_map = first_map + map_count - 1;
3191 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3192 if (next_offset == next_nonstatic_field_offset) {
3193 allocation_style = 0; // allocate oops first
3194 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3195 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3196 (nonstatic_oop_count * heapOopSize);
3197 }
3198 }
3199 if( allocation_style == 2 ) {
3200 allocation_style = 1; // allocate oops last
3201 next_nonstatic_double_offset = next_nonstatic_field_offset;
3202 }
3203 } else {
3204 ShouldNotReachHere();
3205 }
3207 int nonstatic_oop_space_count = 0;
3208 int nonstatic_word_space_count = 0;
3209 int nonstatic_short_space_count = 0;
3210 int nonstatic_byte_space_count = 0;
3211 int nonstatic_oop_space_offset;
3212 int nonstatic_word_space_offset;
3213 int nonstatic_short_space_offset;
3214 int nonstatic_byte_space_offset;
3216 if( nonstatic_double_count > 0 ) {
3217 int offset = next_nonstatic_double_offset;
3218 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3219 if( compact_fields && offset != next_nonstatic_double_offset ) {
3220 // Allocate available fields into the gap before double field.
3221 int length = next_nonstatic_double_offset - offset;
3222 assert(length == BytesPerInt, "");
3223 nonstatic_word_space_offset = offset;
3224 if( nonstatic_word_count > 0 ) {
3225 nonstatic_word_count -= 1;
3226 nonstatic_word_space_count = 1; // Only one will fit
3227 length -= BytesPerInt;
3228 offset += BytesPerInt;
3229 }
3230 nonstatic_short_space_offset = offset;
3231 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3232 nonstatic_short_count -= 1;
3233 nonstatic_short_space_count += 1;
3234 length -= BytesPerShort;
3235 offset += BytesPerShort;
3236 }
3237 nonstatic_byte_space_offset = offset;
3238 while( length > 0 && nonstatic_byte_count > 0 ) {
3239 nonstatic_byte_count -= 1;
3240 nonstatic_byte_space_count += 1;
3241 length -= 1;
3242 }
3243 // Allocate oop field in the gap if there are no other fields for that.
3244 nonstatic_oop_space_offset = offset;
3245 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3246 allocation_style != 0 ) { // when oop fields not first
3247 nonstatic_oop_count -= 1;
3248 nonstatic_oop_space_count = 1; // Only one will fit
3249 length -= heapOopSize;
3250 offset += heapOopSize;
3251 }
3252 }
3253 }
3255 next_nonstatic_word_offset = next_nonstatic_double_offset +
3256 (nonstatic_double_count * BytesPerLong);
3257 next_nonstatic_short_offset = next_nonstatic_word_offset +
3258 (nonstatic_word_count * BytesPerInt);
3259 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3260 (nonstatic_short_count * BytesPerShort);
3262 int notaligned_offset;
3263 if( allocation_style == 0 ) {
3264 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3265 } else { // allocation_style == 1
3266 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3267 if( nonstatic_oop_count > 0 ) {
3268 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3269 }
3270 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3271 }
3272 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3273 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3274 - first_nonstatic_field_offset)/heapOopSize);
3276 // Iterate over fields again and compute correct offsets.
3277 // The field allocation type was temporarily stored in the offset slot.
3278 // oop fields are located before non-oop fields (static and non-static).
3279 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3280 int real_offset;
3281 FieldAllocationType atype = (FieldAllocationType) fs.offset();
3282 switch (atype) {
3283 case STATIC_OOP:
3284 real_offset = next_static_oop_offset;
3285 next_static_oop_offset += heapOopSize;
3286 break;
3287 case STATIC_BYTE:
3288 real_offset = next_static_byte_offset;
3289 next_static_byte_offset += 1;
3290 break;
3291 case STATIC_SHORT:
3292 real_offset = next_static_short_offset;
3293 next_static_short_offset += BytesPerShort;
3294 break;
3295 case STATIC_WORD:
3296 real_offset = next_static_word_offset;
3297 next_static_word_offset += BytesPerInt;
3298 break;
3299 case STATIC_DOUBLE:
3300 real_offset = next_static_double_offset;
3301 next_static_double_offset += BytesPerLong;
3302 break;
3303 case NONSTATIC_OOP:
3304 if( nonstatic_oop_space_count > 0 ) {
3305 real_offset = nonstatic_oop_space_offset;
3306 nonstatic_oop_space_offset += heapOopSize;
3307 nonstatic_oop_space_count -= 1;
3308 } else {
3309 real_offset = next_nonstatic_oop_offset;
3310 next_nonstatic_oop_offset += heapOopSize;
3311 }
3312 // Update oop maps
3313 if( nonstatic_oop_map_count > 0 &&
3314 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3315 real_offset -
3316 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3317 heapOopSize ) {
3318 // Extend current oop map
3319 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3320 } else {
3321 // Create new oop map
3322 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3323 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3324 nonstatic_oop_map_count += 1;
3325 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3326 first_nonstatic_oop_offset = real_offset;
3327 }
3328 }
3329 break;
3330 case NONSTATIC_BYTE:
3331 if( nonstatic_byte_space_count > 0 ) {
3332 real_offset = nonstatic_byte_space_offset;
3333 nonstatic_byte_space_offset += 1;
3334 nonstatic_byte_space_count -= 1;
3335 } else {
3336 real_offset = next_nonstatic_byte_offset;
3337 next_nonstatic_byte_offset += 1;
3338 }
3339 break;
3340 case NONSTATIC_SHORT:
3341 if( nonstatic_short_space_count > 0 ) {
3342 real_offset = nonstatic_short_space_offset;
3343 nonstatic_short_space_offset += BytesPerShort;
3344 nonstatic_short_space_count -= 1;
3345 } else {
3346 real_offset = next_nonstatic_short_offset;
3347 next_nonstatic_short_offset += BytesPerShort;
3348 }
3349 break;
3350 case NONSTATIC_WORD:
3351 if( nonstatic_word_space_count > 0 ) {
3352 real_offset = nonstatic_word_space_offset;
3353 nonstatic_word_space_offset += BytesPerInt;
3354 nonstatic_word_space_count -= 1;
3355 } else {
3356 real_offset = next_nonstatic_word_offset;
3357 next_nonstatic_word_offset += BytesPerInt;
3358 }
3359 break;
3360 case NONSTATIC_DOUBLE:
3361 real_offset = next_nonstatic_double_offset;
3362 next_nonstatic_double_offset += BytesPerLong;
3363 break;
3364 default:
3365 ShouldNotReachHere();
3366 }
3367 fs.set_offset(real_offset);
3368 }
3370 // Size of instances
3371 int instance_size;
3373 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3374 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3376 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3378 // Number of non-static oop map blocks allocated at end of klass.
3379 const unsigned int total_oop_map_count =
3380 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3381 first_nonstatic_oop_offset);
3383 // Compute reference type
3384 ReferenceType rt;
3385 if (super_klass() == NULL) {
3386 rt = REF_NONE;
3387 } else {
3388 rt = super_klass->reference_type();
3389 }
3391 // We can now create the basic klassOop for this klass
3392 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3393 static_field_size,
3394 total_oop_map_count,
3395 access_flags,
3396 rt, host_klass,
3397 CHECK_(nullHandle));
3398 instanceKlassHandle this_klass (THREAD, ik);
3400 assert(this_klass->static_field_size() == static_field_size, "sanity");
3401 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3402 "sanity");
3404 // Fill in information already parsed
3405 this_klass->set_should_verify_class(verify);
3406 jint lh = Klass::instance_layout_helper(instance_size, false);
3407 this_klass->set_layout_helper(lh);
3408 assert(this_klass->oop_is_instance(), "layout is correct");
3409 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3410 // Not yet: supers are done below to support the new subtype-checking fields
3411 //this_klass->set_super(super_klass());
3412 this_klass->set_class_loader(class_loader());
3413 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3414 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3415 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3416 cp->set_pool_holder(this_klass());
3417 error_handler.set_in_error(false); // turn off error handler for cp
3418 this_klass->set_constants(cp());
3419 this_klass->set_local_interfaces(local_interfaces());
3420 this_klass->set_fields(fields(), java_fields_count);
3421 this_klass->set_methods(methods());
3422 if (has_final_method) {
3423 this_klass->set_has_final_method();
3424 }
3425 this_klass->set_method_ordering(method_ordering());
3426 // The instanceKlass::_methods_jmethod_ids cache and the
3427 // instanceKlass::_methods_cached_itable_indices cache are
3428 // both managed on the assumption that the initial cache
3429 // size is equal to the number of methods in the class. If
3430 // that changes, then instanceKlass::idnum_can_increment()
3431 // has to be changed accordingly.
3432 this_klass->set_initial_method_idnum(methods->length());
3433 this_klass->set_name(cp->klass_name_at(this_class_index));
3434 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3435 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3436 this_klass->set_protection_domain(protection_domain());
3437 this_klass->set_fields_annotations(fields_annotations());
3438 this_klass->set_methods_annotations(methods_annotations());
3439 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3440 this_klass->set_methods_default_annotations(methods_default_annotations());
3442 this_klass->set_minor_version(minor_version);
3443 this_klass->set_major_version(major_version);
3445 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3446 // (We used to do this lazily, but now we query it in Rewriter,
3447 // which is eagerly done for every method, so we might as well do it now,
3448 // when everything is fresh in memory.)
3449 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3450 for (int j = 0; j < methods->length(); j++) {
3451 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3452 }
3453 }
3455 if (cached_class_file_bytes != NULL) {
3456 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3457 this_klass->set_cached_class_file(cached_class_file_bytes,
3458 cached_class_file_length);
3459 }
3461 // Miranda methods
3462 if ((num_miranda_methods > 0) ||
3463 // if this class introduced new miranda methods or
3464 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3465 // super class exists and this class inherited miranda methods
3466 ) {
3467 this_klass->set_has_miranda_methods(); // then set a flag
3468 }
3470 // Additional attributes
3471 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3473 // Make sure this is the end of class file stream
3474 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3476 // VerifyOops believes that once this has been set, the object is completely loaded.
3477 // Compute transitive closure of interfaces this class implements
3478 this_klass->set_transitive_interfaces(transitive_interfaces());
3480 // Fill in information needed to compute superclasses.
3481 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3483 // Initialize itable offset tables
3484 klassItable::setup_itable_offset_table(this_klass);
3486 // Do final class setup
3487 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3489 set_precomputed_flags(this_klass);
3491 // reinitialize modifiers, using the InnerClasses attribute
3492 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3493 this_klass->set_modifier_flags(computed_modifiers);
3495 // check if this class can access its super class
3496 check_super_class_access(this_klass, CHECK_(nullHandle));
3498 // check if this class can access its superinterfaces
3499 check_super_interface_access(this_klass, CHECK_(nullHandle));
3501 // check if this class overrides any final method
3502 check_final_method_override(this_klass, CHECK_(nullHandle));
3504 // check that if this class is an interface then it doesn't have static methods
3505 if (this_klass->is_interface()) {
3506 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3507 }
3509 // Allocate mirror and initialize static fields
3510 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3512 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3513 false /* not shared class */);
3515 if (TraceClassLoading) {
3516 // print in a single call to reduce interleaving of output
3517 if (cfs->source() != NULL) {
3518 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3519 cfs->source());
3520 } else if (class_loader.is_null()) {
3521 if (THREAD->is_Java_thread()) {
3522 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3523 tty->print("[Loaded %s by instance of %s]\n",
3524 this_klass->external_name(),
3525 instanceKlass::cast(caller)->external_name());
3526 } else {
3527 tty->print("[Loaded %s]\n", this_klass->external_name());
3528 }
3529 } else {
3530 ResourceMark rm;
3531 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3532 instanceKlass::cast(class_loader->klass())->external_name());
3533 }
3534 }
3536 if (TraceClassResolution) {
3537 // print out the superclass.
3538 const char * from = Klass::cast(this_klass())->external_name();
3539 if (this_klass->java_super() != NULL) {
3540 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3541 }
3542 // print out each of the interface classes referred to by this class.
3543 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3544 if (!local_interfaces.is_null()) {
3545 int length = local_interfaces->length();
3546 for (int i = 0; i < length; i++) {
3547 klassOop k = klassOop(local_interfaces->obj_at(i));
3548 instanceKlass* to_class = instanceKlass::cast(k);
3549 const char * to = to_class->external_name();
3550 tty->print("RESOLVE %s %s (interface)\n", from, to);
3551 }
3552 }
3553 }
3555 #ifndef PRODUCT
3556 if( PrintCompactFieldsSavings ) {
3557 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3558 tty->print("[Saved %d of %d bytes in %s]\n",
3559 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3560 orig_nonstatic_field_size*heapOopSize,
3561 this_klass->external_name());
3562 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3563 tty->print("[Wasted %d over %d bytes in %s]\n",
3564 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3565 orig_nonstatic_field_size*heapOopSize,
3566 this_klass->external_name());
3567 }
3568 }
3569 #endif
3571 // preserve result across HandleMark
3572 preserve_this_klass = this_klass();
3573 }
3575 // Create new handle outside HandleMark
3576 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3577 debug_only(this_klass->as_klassOop()->verify();)
3579 return this_klass;
3580 }
3583 unsigned int
3584 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3585 unsigned int nonstatic_oop_map_count,
3586 int first_nonstatic_oop_offset) {
3587 unsigned int map_count =
3588 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3589 if (nonstatic_oop_map_count > 0) {
3590 // We have oops to add to map
3591 if (map_count == 0) {
3592 map_count = nonstatic_oop_map_count;
3593 } else {
3594 // Check whether we should add a new map block or whether the last one can
3595 // be extended
3596 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3597 OopMapBlock* const last_map = first_map + map_count - 1;
3599 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3600 if (next_offset == first_nonstatic_oop_offset) {
3601 // There is no gap bettwen superklass's last oop field and first
3602 // local oop field, merge maps.
3603 nonstatic_oop_map_count -= 1;
3604 } else {
3605 // Superklass didn't end with a oop field, add extra maps
3606 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3607 }
3608 map_count += nonstatic_oop_map_count;
3609 }
3610 }
3611 return map_count;
3612 }
3615 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3616 unsigned int nonstatic_oop_map_count,
3617 int* nonstatic_oop_offsets,
3618 unsigned int* nonstatic_oop_counts) {
3619 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3620 const instanceKlass* const super = k->superklass();
3621 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3622 if (super_count > 0) {
3623 // Copy maps from superklass
3624 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3625 for (unsigned int i = 0; i < super_count; ++i) {
3626 *this_oop_map++ = *super_oop_map++;
3627 }
3628 }
3630 if (nonstatic_oop_map_count > 0) {
3631 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3632 // The counts differ because there is no gap between superklass's last oop
3633 // field and the first local oop field. Extend the last oop map copied
3634 // from the superklass instead of creating new one.
3635 nonstatic_oop_map_count--;
3636 nonstatic_oop_offsets++;
3637 this_oop_map--;
3638 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3639 this_oop_map++;
3640 }
3642 // Add new map blocks, fill them
3643 while (nonstatic_oop_map_count-- > 0) {
3644 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3645 this_oop_map->set_count(*nonstatic_oop_counts++);
3646 this_oop_map++;
3647 }
3648 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3649 this_oop_map, "sanity");
3650 }
3651 }
3654 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3655 klassOop super = k->super();
3657 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3658 // in which case we don't have to register objects as finalizable
3659 if (!_has_empty_finalizer) {
3660 if (_has_finalizer ||
3661 (super != NULL && super->klass_part()->has_finalizer())) {
3662 k->set_has_finalizer();
3663 }
3664 }
3666 #ifdef ASSERT
3667 bool f = false;
3668 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3669 vmSymbols::void_method_signature());
3670 if (m != NULL && !m->is_empty_method()) {
3671 f = true;
3672 }
3673 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3674 #endif
3676 // Check if this klass supports the java.lang.Cloneable interface
3677 if (SystemDictionary::Cloneable_klass_loaded()) {
3678 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3679 k->set_is_cloneable();
3680 }
3681 }
3683 // Check if this klass has a vanilla default constructor
3684 if (super == NULL) {
3685 // java.lang.Object has empty default constructor
3686 k->set_has_vanilla_constructor();
3687 } else {
3688 if (Klass::cast(super)->has_vanilla_constructor() &&
3689 _has_vanilla_constructor) {
3690 k->set_has_vanilla_constructor();
3691 }
3692 #ifdef ASSERT
3693 bool v = false;
3694 if (Klass::cast(super)->has_vanilla_constructor()) {
3695 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3696 ), vmSymbols::void_method_signature());
3697 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3698 v = true;
3699 }
3700 }
3701 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3702 #endif
3703 }
3705 // If it cannot be fast-path allocated, set a bit in the layout helper.
3706 // See documentation of instanceKlass::can_be_fastpath_allocated().
3707 assert(k->size_helper() > 0, "layout_helper is initialized");
3708 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3709 || k->is_abstract() || k->is_interface()
3710 || (k->name() == vmSymbols::java_lang_Class()
3711 && k->class_loader() == NULL)
3712 || k->size_helper() >= FastAllocateSizeLimit) {
3713 // Forbid fast-path allocation.
3714 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3715 k->set_layout_helper(lh);
3716 }
3717 }
3720 // utility method for appending and array with check for duplicates
3722 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3723 // iterate over new interfaces
3724 for (int i = 0; i < ifs->length(); i++) {
3725 oop e = ifs->obj_at(i);
3726 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3727 // check for duplicates
3728 bool duplicate = false;
3729 for (int j = 0; j < index; j++) {
3730 if (result->obj_at(j) == e) {
3731 duplicate = true;
3732 break;
3733 }
3734 }
3735 // add new interface
3736 if (!duplicate) {
3737 result->obj_at_put(index++, e);
3738 }
3739 }
3740 }
3742 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3743 // Compute maximum size for transitive interfaces
3744 int max_transitive_size = 0;
3745 int super_size = 0;
3746 // Add superclass transitive interfaces size
3747 if (super.not_null()) {
3748 super_size = super->transitive_interfaces()->length();
3749 max_transitive_size += super_size;
3750 }
3751 // Add local interfaces' super interfaces
3752 int local_size = local_ifs->length();
3753 for (int i = 0; i < local_size; i++) {
3754 klassOop l = klassOop(local_ifs->obj_at(i));
3755 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3756 }
3757 // Finally add local interfaces
3758 max_transitive_size += local_size;
3759 // Construct array
3760 objArrayHandle result;
3761 if (max_transitive_size == 0) {
3762 // no interfaces, use canonicalized array
3763 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3764 } else if (max_transitive_size == super_size) {
3765 // no new local interfaces added, share superklass' transitive interface array
3766 result = objArrayHandle(THREAD, super->transitive_interfaces());
3767 } else if (max_transitive_size == local_size) {
3768 // only local interfaces added, share local interface array
3769 result = local_ifs;
3770 } else {
3771 objArrayHandle nullHandle;
3772 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3773 result = objArrayHandle(THREAD, new_objarray);
3774 int index = 0;
3775 // Copy down from superclass
3776 if (super.not_null()) {
3777 append_interfaces(result, index, super->transitive_interfaces());
3778 }
3779 // Copy down from local interfaces' superinterfaces
3780 for (int i = 0; i < local_ifs->length(); i++) {
3781 klassOop l = klassOop(local_ifs->obj_at(i));
3782 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3783 }
3784 // Finally add local interfaces
3785 append_interfaces(result, index, local_ifs());
3787 // Check if duplicates were removed
3788 if (index != max_transitive_size) {
3789 assert(index < max_transitive_size, "just checking");
3790 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3791 for (int i = 0; i < index; i++) {
3792 oop e = result->obj_at(i);
3793 assert(e != NULL, "just checking");
3794 new_result->obj_at_put(i, e);
3795 }
3796 result = objArrayHandle(THREAD, new_result);
3797 }
3798 }
3799 return result;
3800 }
3803 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3804 klassOop super = this_klass->super();
3805 if ((super != NULL) &&
3806 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3807 ResourceMark rm(THREAD);
3808 Exceptions::fthrow(
3809 THREAD_AND_LOCATION,
3810 vmSymbols::java_lang_IllegalAccessError(),
3811 "class %s cannot access its superclass %s",
3812 this_klass->external_name(),
3813 instanceKlass::cast(super)->external_name()
3814 );
3815 return;
3816 }
3817 }
3820 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3821 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3822 int lng = local_interfaces->length();
3823 for (int i = lng - 1; i >= 0; i--) {
3824 klassOop k = klassOop(local_interfaces->obj_at(i));
3825 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3826 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3827 ResourceMark rm(THREAD);
3828 Exceptions::fthrow(
3829 THREAD_AND_LOCATION,
3830 vmSymbols::java_lang_IllegalAccessError(),
3831 "class %s cannot access its superinterface %s",
3832 this_klass->external_name(),
3833 instanceKlass::cast(k)->external_name()
3834 );
3835 return;
3836 }
3837 }
3838 }
3841 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3842 objArrayHandle methods (THREAD, this_klass->methods());
3843 int num_methods = methods->length();
3845 // go thru each method and check if it overrides a final method
3846 for (int index = 0; index < num_methods; index++) {
3847 methodOop m = (methodOop)methods->obj_at(index);
3849 // skip private, static and <init> methods
3850 if ((!m->is_private()) &&
3851 (!m->is_static()) &&
3852 (m->name() != vmSymbols::object_initializer_name())) {
3854 Symbol* name = m->name();
3855 Symbol* signature = m->signature();
3856 klassOop k = this_klass->super();
3857 methodOop super_m = NULL;
3858 while (k != NULL) {
3859 // skip supers that don't have final methods.
3860 if (k->klass_part()->has_final_method()) {
3861 // lookup a matching method in the super class hierarchy
3862 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3863 if (super_m == NULL) {
3864 break; // didn't find any match; get out
3865 }
3867 if (super_m->is_final() &&
3868 // matching method in super is final
3869 (Reflection::verify_field_access(this_klass->as_klassOop(),
3870 super_m->method_holder(),
3871 super_m->method_holder(),
3872 super_m->access_flags(), false))
3873 // this class can access super final method and therefore override
3874 ) {
3875 ResourceMark rm(THREAD);
3876 Exceptions::fthrow(
3877 THREAD_AND_LOCATION,
3878 vmSymbols::java_lang_VerifyError(),
3879 "class %s overrides final method %s.%s",
3880 this_klass->external_name(),
3881 name->as_C_string(),
3882 signature->as_C_string()
3883 );
3884 return;
3885 }
3887 // continue to look from super_m's holder's super.
3888 k = instanceKlass::cast(super_m->method_holder())->super();
3889 continue;
3890 }
3892 k = k->klass_part()->super();
3893 }
3894 }
3895 }
3896 }
3899 // assumes that this_klass is an interface
3900 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3901 assert(this_klass->is_interface(), "not an interface");
3902 objArrayHandle methods (THREAD, this_klass->methods());
3903 int num_methods = methods->length();
3905 for (int index = 0; index < num_methods; index++) {
3906 methodOop m = (methodOop)methods->obj_at(index);
3907 // if m is static and not the init method, throw a verify error
3908 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3909 ResourceMark rm(THREAD);
3910 Exceptions::fthrow(
3911 THREAD_AND_LOCATION,
3912 vmSymbols::java_lang_VerifyError(),
3913 "Illegal static method %s in interface %s",
3914 m->name()->as_C_string(),
3915 this_klass->external_name()
3916 );
3917 return;
3918 }
3919 }
3920 }
3922 // utility methods for format checking
3924 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3925 if (!_need_verify) { return; }
3927 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3928 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3929 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3930 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3931 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3932 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3933 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3935 if ((is_abstract && is_final) ||
3936 (is_interface && !is_abstract) ||
3937 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3938 (!is_interface && major_gte_15 && is_annotation)) {
3939 ResourceMark rm(THREAD);
3940 Exceptions::fthrow(
3941 THREAD_AND_LOCATION,
3942 vmSymbols::java_lang_ClassFormatError(),
3943 "Illegal class modifiers in class %s: 0x%X",
3944 _class_name->as_C_string(), flags
3945 );
3946 return;
3947 }
3948 }
3950 bool ClassFileParser::has_illegal_visibility(jint flags) {
3951 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3952 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3953 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3955 return ((is_public && is_protected) ||
3956 (is_public && is_private) ||
3957 (is_protected && is_private));
3958 }
3960 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3961 u2 max_version =
3962 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3963 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3964 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3965 (major <= max_version) &&
3966 ((major != max_version) ||
3967 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3968 }
3970 void ClassFileParser::verify_legal_field_modifiers(
3971 jint flags, bool is_interface, TRAPS) {
3972 if (!_need_verify) { return; }
3974 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3975 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3976 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3977 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3978 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3979 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3980 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3981 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3982 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3984 bool is_illegal = false;
3986 if (is_interface) {
3987 if (!is_public || !is_static || !is_final || is_private ||
3988 is_protected || is_volatile || is_transient ||
3989 (major_gte_15 && is_enum)) {
3990 is_illegal = true;
3991 }
3992 } else { // not interface
3993 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3994 is_illegal = true;
3995 }
3996 }
3998 if (is_illegal) {
3999 ResourceMark rm(THREAD);
4000 Exceptions::fthrow(
4001 THREAD_AND_LOCATION,
4002 vmSymbols::java_lang_ClassFormatError(),
4003 "Illegal field modifiers in class %s: 0x%X",
4004 _class_name->as_C_string(), flags);
4005 return;
4006 }
4007 }
4009 void ClassFileParser::verify_legal_method_modifiers(
4010 jint flags, bool is_interface, Symbol* name, TRAPS) {
4011 if (!_need_verify) { return; }
4013 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4014 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4015 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4016 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4017 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4018 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4019 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4020 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4021 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4022 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4023 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4025 bool is_illegal = false;
4027 if (is_interface) {
4028 if (!is_abstract || !is_public || is_static || is_final ||
4029 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4030 is_illegal = true;
4031 }
4032 } else { // not interface
4033 if (is_initializer) {
4034 if (is_static || is_final || is_synchronized || is_native ||
4035 is_abstract || (major_gte_15 && is_bridge)) {
4036 is_illegal = true;
4037 }
4038 } else { // not initializer
4039 if (is_abstract) {
4040 if ((is_final || is_native || is_private || is_static ||
4041 (major_gte_15 && (is_synchronized || is_strict)))) {
4042 is_illegal = true;
4043 }
4044 }
4045 if (has_illegal_visibility(flags)) {
4046 is_illegal = true;
4047 }
4048 }
4049 }
4051 if (is_illegal) {
4052 ResourceMark rm(THREAD);
4053 Exceptions::fthrow(
4054 THREAD_AND_LOCATION,
4055 vmSymbols::java_lang_ClassFormatError(),
4056 "Method %s in class %s has illegal modifiers: 0x%X",
4057 name->as_C_string(), _class_name->as_C_string(), flags);
4058 return;
4059 }
4060 }
4062 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4063 assert(_need_verify, "only called when _need_verify is true");
4064 int i = 0;
4065 int count = length >> 2;
4066 for (int k=0; k<count; k++) {
4067 unsigned char b0 = buffer[i];
4068 unsigned char b1 = buffer[i+1];
4069 unsigned char b2 = buffer[i+2];
4070 unsigned char b3 = buffer[i+3];
4071 // For an unsigned char v,
4072 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4073 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4074 unsigned char res = b0 | b0 - 1 |
4075 b1 | b1 - 1 |
4076 b2 | b2 - 1 |
4077 b3 | b3 - 1;
4078 if (res >= 128) break;
4079 i += 4;
4080 }
4081 for(; i < length; i++) {
4082 unsigned short c;
4083 // no embedded zeros
4084 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4085 if(buffer[i] < 128) {
4086 continue;
4087 }
4088 if ((i + 5) < length) { // see if it's legal supplementary character
4089 if (UTF8::is_supplementary_character(&buffer[i])) {
4090 c = UTF8::get_supplementary_character(&buffer[i]);
4091 i += 5;
4092 continue;
4093 }
4094 }
4095 switch (buffer[i] >> 4) {
4096 default: break;
4097 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4098 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4099 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4100 c = (buffer[i] & 0x1F) << 6;
4101 i++;
4102 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4103 c += buffer[i] & 0x3F;
4104 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4105 // for classes with major > 47, c must a null or a character in its shortest form
4106 break;
4107 }
4108 }
4109 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4110 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4111 c = (buffer[i] & 0xF) << 12;
4112 i += 2;
4113 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4114 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4115 if (_major_version <= 47 || c >= 0x800) {
4116 // for classes with major > 47, c must be in its shortest form
4117 break;
4118 }
4119 }
4120 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4121 } // end of switch
4122 } // end of for
4123 }
4125 // Checks if name is a legal class name.
4126 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4127 if (!_need_verify || _relax_verify) { return; }
4129 char buf[fixed_buffer_size];
4130 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4131 unsigned int length = name->utf8_length();
4132 bool legal = false;
4134 if (length > 0) {
4135 char* p;
4136 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4137 p = skip_over_field_signature(bytes, false, length, CHECK);
4138 legal = (p != NULL) && ((p - bytes) == (int)length);
4139 } else if (_major_version < JAVA_1_5_VERSION) {
4140 if (bytes[0] != '<') {
4141 p = skip_over_field_name(bytes, true, length);
4142 legal = (p != NULL) && ((p - bytes) == (int)length);
4143 }
4144 } else {
4145 // 4900761: relax the constraints based on JSR202 spec
4146 // Class names may be drawn from the entire Unicode character set.
4147 // Identifiers between '/' must be unqualified names.
4148 // The utf8 string has been verified when parsing cpool entries.
4149 legal = verify_unqualified_name(bytes, length, LegalClass);
4150 }
4151 }
4152 if (!legal) {
4153 ResourceMark rm(THREAD);
4154 Exceptions::fthrow(
4155 THREAD_AND_LOCATION,
4156 vmSymbols::java_lang_ClassFormatError(),
4157 "Illegal class name \"%s\" in class file %s", bytes,
4158 _class_name->as_C_string()
4159 );
4160 return;
4161 }
4162 }
4164 // Checks if name is a legal field name.
4165 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4166 if (!_need_verify || _relax_verify) { return; }
4168 char buf[fixed_buffer_size];
4169 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4170 unsigned int length = name->utf8_length();
4171 bool legal = false;
4173 if (length > 0) {
4174 if (_major_version < JAVA_1_5_VERSION) {
4175 if (bytes[0] != '<') {
4176 char* p = skip_over_field_name(bytes, false, length);
4177 legal = (p != NULL) && ((p - bytes) == (int)length);
4178 }
4179 } else {
4180 // 4881221: relax the constraints based on JSR202 spec
4181 legal = verify_unqualified_name(bytes, length, LegalField);
4182 }
4183 }
4185 if (!legal) {
4186 ResourceMark rm(THREAD);
4187 Exceptions::fthrow(
4188 THREAD_AND_LOCATION,
4189 vmSymbols::java_lang_ClassFormatError(),
4190 "Illegal field name \"%s\" in class %s", bytes,
4191 _class_name->as_C_string()
4192 );
4193 return;
4194 }
4195 }
4197 // Checks if name is a legal method name.
4198 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4199 if (!_need_verify || _relax_verify) { return; }
4201 assert(name != NULL, "method name is null");
4202 char buf[fixed_buffer_size];
4203 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4204 unsigned int length = name->utf8_length();
4205 bool legal = false;
4207 if (length > 0) {
4208 if (bytes[0] == '<') {
4209 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4210 legal = true;
4211 }
4212 } else if (_major_version < JAVA_1_5_VERSION) {
4213 char* p;
4214 p = skip_over_field_name(bytes, false, length);
4215 legal = (p != NULL) && ((p - bytes) == (int)length);
4216 } else {
4217 // 4881221: relax the constraints based on JSR202 spec
4218 legal = verify_unqualified_name(bytes, length, LegalMethod);
4219 }
4220 }
4222 if (!legal) {
4223 ResourceMark rm(THREAD);
4224 Exceptions::fthrow(
4225 THREAD_AND_LOCATION,
4226 vmSymbols::java_lang_ClassFormatError(),
4227 "Illegal method name \"%s\" in class %s", bytes,
4228 _class_name->as_C_string()
4229 );
4230 return;
4231 }
4232 }
4235 // Checks if signature is a legal field signature.
4236 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4237 if (!_need_verify) { return; }
4239 char buf[fixed_buffer_size];
4240 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4241 unsigned int length = signature->utf8_length();
4242 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4244 if (p == NULL || (p - bytes) != (int)length) {
4245 throwIllegalSignature("Field", name, signature, CHECK);
4246 }
4247 }
4249 // Checks if signature is a legal method signature.
4250 // Returns number of parameters
4251 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4252 if (!_need_verify) {
4253 // make sure caller's args_size will be less than 0 even for non-static
4254 // method so it will be recomputed in compute_size_of_parameters().
4255 return -2;
4256 }
4258 unsigned int args_size = 0;
4259 char buf[fixed_buffer_size];
4260 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4261 unsigned int length = signature->utf8_length();
4262 char* nextp;
4264 // The first character must be a '('
4265 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4266 length--;
4267 // Skip over legal field signatures
4268 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4269 while ((length > 0) && (nextp != NULL)) {
4270 args_size++;
4271 if (p[0] == 'J' || p[0] == 'D') {
4272 args_size++;
4273 }
4274 length -= nextp - p;
4275 p = nextp;
4276 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4277 }
4278 // The first non-signature thing better be a ')'
4279 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4280 length--;
4281 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4282 // All internal methods must return void
4283 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4284 return args_size;
4285 }
4286 } else {
4287 // Now we better just have a return value
4288 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4289 if (nextp && ((int)length == (nextp - p))) {
4290 return args_size;
4291 }
4292 }
4293 }
4294 }
4295 // Report error
4296 throwIllegalSignature("Method", name, signature, CHECK_0);
4297 return 0;
4298 }
4301 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4302 // Method names also may not contain the characters '<' or '>', unless <init>
4303 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4304 // method. Because these names have been checked as special cases before
4305 // calling this method in verify_legal_method_name.
4306 bool ClassFileParser::verify_unqualified_name(
4307 char* name, unsigned int length, int type) {
4308 jchar ch;
4310 for (char* p = name; p != name + length; ) {
4311 ch = *p;
4312 if (ch < 128) {
4313 p++;
4314 if (ch == '.' || ch == ';' || ch == '[' ) {
4315 return false; // do not permit '.', ';', or '['
4316 }
4317 if (type != LegalClass && ch == '/') {
4318 return false; // do not permit '/' unless it's class name
4319 }
4320 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4321 return false; // do not permit '<' or '>' in method names
4322 }
4323 } else {
4324 char* tmp_p = UTF8::next(p, &ch);
4325 p = tmp_p;
4326 }
4327 }
4328 return true;
4329 }
4332 // Take pointer to a string. Skip over the longest part of the string that could
4333 // be taken as a fieldname. Allow '/' if slash_ok is true.
4334 // Return a pointer to just past the fieldname.
4335 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4336 // being true, we saw consecutive slashes (meaning we were looking for a
4337 // qualified path but found something that was badly-formed).
4338 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4339 char* p;
4340 jchar ch;
4341 jboolean last_is_slash = false;
4342 jboolean not_first_ch = false;
4344 for (p = name; p != name + length; not_first_ch = true) {
4345 char* old_p = p;
4346 ch = *p;
4347 if (ch < 128) {
4348 p++;
4349 // quick check for ascii
4350 if ((ch >= 'a' && ch <= 'z') ||
4351 (ch >= 'A' && ch <= 'Z') ||
4352 (ch == '_' || ch == '$') ||
4353 (not_first_ch && ch >= '0' && ch <= '9')) {
4354 last_is_slash = false;
4355 continue;
4356 }
4357 if (slash_ok && ch == '/') {
4358 if (last_is_slash) {
4359 return NULL; // Don't permit consecutive slashes
4360 }
4361 last_is_slash = true;
4362 continue;
4363 }
4364 } else {
4365 jint unicode_ch;
4366 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4367 p = tmp_p;
4368 last_is_slash = false;
4369 // Check if ch is Java identifier start or is Java identifier part
4370 // 4672820: call java.lang.Character methods directly without generating separate tables.
4371 EXCEPTION_MARK;
4372 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4374 // return value
4375 JavaValue result(T_BOOLEAN);
4376 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4377 JavaCallArguments args;
4378 args.push_int(unicode_ch);
4380 // public static boolean isJavaIdentifierStart(char ch);
4381 JavaCalls::call_static(&result,
4382 klass,
4383 vmSymbols::isJavaIdentifierStart_name(),
4384 vmSymbols::int_bool_signature(),
4385 &args,
4386 THREAD);
4388 if (HAS_PENDING_EXCEPTION) {
4389 CLEAR_PENDING_EXCEPTION;
4390 return 0;
4391 }
4392 if (result.get_jboolean()) {
4393 continue;
4394 }
4396 if (not_first_ch) {
4397 // public static boolean isJavaIdentifierPart(char ch);
4398 JavaCalls::call_static(&result,
4399 klass,
4400 vmSymbols::isJavaIdentifierPart_name(),
4401 vmSymbols::int_bool_signature(),
4402 &args,
4403 THREAD);
4405 if (HAS_PENDING_EXCEPTION) {
4406 CLEAR_PENDING_EXCEPTION;
4407 return 0;
4408 }
4410 if (result.get_jboolean()) {
4411 continue;
4412 }
4413 }
4414 }
4415 return (not_first_ch) ? old_p : NULL;
4416 }
4417 return (not_first_ch) ? p : NULL;
4418 }
4421 // Take pointer to a string. Skip over the longest part of the string that could
4422 // be taken as a field signature. Allow "void" if void_ok.
4423 // Return a pointer to just past the signature.
4424 // Return NULL if no legal signature is found.
4425 char* ClassFileParser::skip_over_field_signature(char* signature,
4426 bool void_ok,
4427 unsigned int length,
4428 TRAPS) {
4429 unsigned int array_dim = 0;
4430 while (length > 0) {
4431 switch (signature[0]) {
4432 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4433 case JVM_SIGNATURE_BOOLEAN:
4434 case JVM_SIGNATURE_BYTE:
4435 case JVM_SIGNATURE_CHAR:
4436 case JVM_SIGNATURE_SHORT:
4437 case JVM_SIGNATURE_INT:
4438 case JVM_SIGNATURE_FLOAT:
4439 case JVM_SIGNATURE_LONG:
4440 case JVM_SIGNATURE_DOUBLE:
4441 return signature + 1;
4442 case JVM_SIGNATURE_CLASS: {
4443 if (_major_version < JAVA_1_5_VERSION) {
4444 // Skip over the class name if one is there
4445 char* p = skip_over_field_name(signature + 1, true, --length);
4447 // The next character better be a semicolon
4448 if (p && (p - signature) > 1 && p[0] == ';') {
4449 return p + 1;
4450 }
4451 } else {
4452 // 4900761: For class version > 48, any unicode is allowed in class name.
4453 length--;
4454 signature++;
4455 while (length > 0 && signature[0] != ';') {
4456 if (signature[0] == '.') {
4457 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4458 }
4459 length--;
4460 signature++;
4461 }
4462 if (signature[0] == ';') { return signature + 1; }
4463 }
4465 return NULL;
4466 }
4467 case JVM_SIGNATURE_ARRAY:
4468 array_dim++;
4469 if (array_dim > 255) {
4470 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4471 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4472 }
4473 // The rest of what's there better be a legal signature
4474 signature++;
4475 length--;
4476 void_ok = false;
4477 break;
4479 default:
4480 return NULL;
4481 }
4482 }
4483 return NULL;
4484 }