1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/defaultMethods.hpp"
30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/verificationType.hpp"
34 #include "classfile/verifier.hpp"
35 #include "classfile/vmSymbols.hpp"
36 #include "gc/shared/gcLocker.hpp"
37 #include "logging/log.hpp"
38 #include "memory/allocation.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/referenceType.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/constantPool.hpp"
45 #include "oops/fieldStreams.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/instanceMirrorKlass.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "oops/klassVtable.hpp"
50 #include "oops/method.hpp"
51 #include "oops/symbol.hpp"
52 #include "prims/jvm.h"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/jvmtiThreadState.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/perfData.hpp"
57 #include "runtime/reflection.hpp"
58 #include "runtime/signature.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/classLoadingService.hpp"
61 #include "services/threadService.hpp"
62 #include "utilities/array.hpp"
63 #include "utilities/exceptions.hpp"
64 #include "utilities/globalDefinitions.hpp"
65 #include "utilities/macros.hpp"
66 #include "utilities/ostream.hpp"
67 #include "utilities/resourceHash.hpp"
68 #if INCLUDE_CDS
69 #include "classfile/systemDictionaryShared.hpp"
70 #endif
71
72 // We generally try to create the oops directly when parsing, rather than
73 // allocating temporary data structures and copying the bytes twice. A
74 // temporary area is only needed when parsing utf8 entries in the constant
75 // pool and when parsing line number tables.
76
77 // We add assert in debug mode when class format is not checked.
78
79 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
80 #define JAVA_MIN_SUPPORTED_VERSION 45
81 #define JAVA_MAX_SUPPORTED_VERSION 52
82 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
83
84 // Used for two backward compatibility reasons:
85 // - to check for new additions to the class file format in JDK1.5
86 // - to check for bug fixes in the format checker in JDK1.5
87 #define JAVA_1_5_VERSION 49
88
89 // Used for backward compatibility reasons:
90 // - to check for javac bug fixes that happened after 1.5
91 // - also used as the max version when running in jdk6
92 #define JAVA_6_VERSION 50
93
94 // Used for backward compatibility reasons:
95 // - to check NameAndType_info signatures more aggressively
96 #define JAVA_7_VERSION 51
97
98 // Extension method support.
99 #define JAVA_8_VERSION 52
100
101 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
102 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
103 // this function (_current can be allocated in a register, with scalar
104 // replacement of aggregates). The _current pointer is copied back to
105 // stream() when this function returns. DON'T call another method within
106 // this method that uses stream().
107 ClassFileStream* cfs0 = stream();
108 ClassFileStream cfs1 = *cfs0;
109 ClassFileStream* cfs = &cfs1;
110 #ifdef ASSERT
111 assert(cfs->allocated_on_stack(),"should be local");
112 u1* old_current = cfs0->current();
113 #endif
114 Handle class_loader(THREAD, _loader_data->class_loader());
115
116 // Used for batching symbol allocations.
117 const char* names[SymbolTable::symbol_alloc_batch_size];
118 int lengths[SymbolTable::symbol_alloc_batch_size];
119 int indices[SymbolTable::symbol_alloc_batch_size];
120 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
121 int names_count = 0;
122
123 // parsing Index 0 is unused
124 for (int index = 1; index < length; index++) {
125 // Each of the following case guarantees one more byte in the stream
126 // for the following tag or the access_flags following constant pool,
127 // so we don't need bounds-check for reading tag.
128 u1 tag = cfs->get_u1_fast();
129 switch (tag) {
130 case JVM_CONSTANT_Class :
131 {
132 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
133 u2 name_index = cfs->get_u2_fast();
134 _cp->klass_index_at_put(index, name_index);
135 }
136 break;
137 case JVM_CONSTANT_Fieldref :
138 {
139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
140 u2 class_index = cfs->get_u2_fast();
141 u2 name_and_type_index = cfs->get_u2_fast();
142 _cp->field_at_put(index, class_index, name_and_type_index);
143 }
144 break;
145 case JVM_CONSTANT_Methodref :
146 {
147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
148 u2 class_index = cfs->get_u2_fast();
149 u2 name_and_type_index = cfs->get_u2_fast();
150 _cp->method_at_put(index, class_index, name_and_type_index);
151 }
152 break;
153 case JVM_CONSTANT_InterfaceMethodref :
154 {
155 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
156 u2 class_index = cfs->get_u2_fast();
157 u2 name_and_type_index = cfs->get_u2_fast();
158 _cp->interface_method_at_put(index, class_index, name_and_type_index);
159 }
160 break;
161 case JVM_CONSTANT_String :
162 {
163 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
164 u2 string_index = cfs->get_u2_fast();
165 _cp->string_index_at_put(index, string_index);
166 }
167 break;
168 case JVM_CONSTANT_MethodHandle :
169 case JVM_CONSTANT_MethodType :
170 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
171 classfile_parse_error(
172 "Class file version does not support constant tag %u in class file %s",
173 tag, CHECK);
174 }
175 if (tag == JVM_CONSTANT_MethodHandle) {
176 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
177 u1 ref_kind = cfs->get_u1_fast();
178 u2 method_index = cfs->get_u2_fast();
179 _cp->method_handle_index_at_put(index, ref_kind, method_index);
180 } else if (tag == JVM_CONSTANT_MethodType) {
181 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
182 u2 signature_index = cfs->get_u2_fast();
183 _cp->method_type_index_at_put(index, signature_index);
184 } else {
185 ShouldNotReachHere();
186 }
187 break;
188 case JVM_CONSTANT_InvokeDynamic :
189 {
190 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
191 classfile_parse_error(
192 "Class file version does not support constant tag %u in class file %s",
193 tag, CHECK);
194 }
195 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
196 u2 bootstrap_specifier_index = cfs->get_u2_fast();
197 u2 name_and_type_index = cfs->get_u2_fast();
198 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
199 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
200 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
201 }
202 break;
203 case JVM_CONSTANT_Integer :
204 {
205 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
206 u4 bytes = cfs->get_u4_fast();
207 _cp->int_at_put(index, (jint) bytes);
208 }
209 break;
210 case JVM_CONSTANT_Float :
211 {
212 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
213 u4 bytes = cfs->get_u4_fast();
214 _cp->float_at_put(index, *(jfloat*)&bytes);
215 }
216 break;
217 case JVM_CONSTANT_Long :
218 // A mangled type might cause you to overrun allocated memory
219 guarantee_property(index+1 < length,
220 "Invalid constant pool entry %u in class file %s",
221 index, CHECK);
222 {
223 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
224 u8 bytes = cfs->get_u8_fast();
225 _cp->long_at_put(index, bytes);
226 }
227 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
228 break;
229 case JVM_CONSTANT_Double :
230 // A mangled type might cause you to overrun allocated memory
231 guarantee_property(index+1 < length,
232 "Invalid constant pool entry %u in class file %s",
233 index, CHECK);
234 {
235 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
236 u8 bytes = cfs->get_u8_fast();
237 _cp->double_at_put(index, *(jdouble*)&bytes);
238 }
239 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
240 break;
241 case JVM_CONSTANT_NameAndType :
242 {
243 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
244 u2 name_index = cfs->get_u2_fast();
245 u2 signature_index = cfs->get_u2_fast();
246 _cp->name_and_type_at_put(index, name_index, signature_index);
247 }
248 break;
249 case JVM_CONSTANT_Utf8 :
250 {
251 cfs->guarantee_more(2, CHECK); // utf8_length
252 u2 utf8_length = cfs->get_u2_fast();
253 u1* utf8_buffer = cfs->get_u1_buffer();
254 assert(utf8_buffer != NULL, "null utf8 buffer");
255 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
256 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
257 cfs->skip_u1_fast(utf8_length);
258
259 // Before storing the symbol, make sure it's legal
260 if (_need_verify) {
261 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
262 }
263
264 if (has_cp_patch_at(index)) {
265 Handle patch = clear_cp_patch_at(index);
266 guarantee_property(java_lang_String::is_instance(patch()),
267 "Illegal utf8 patch at %d in class file %s",
268 index, CHECK);
269 char* str = java_lang_String::as_utf8_string(patch());
270 // (could use java_lang_String::as_symbol instead, but might as well batch them)
271 utf8_buffer = (u1*) str;
272 utf8_length = (int) strlen(str);
273 }
274
275 unsigned int hash;
276 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
277 if (result == NULL) {
278 names[names_count] = (char*)utf8_buffer;
279 lengths[names_count] = utf8_length;
280 indices[names_count] = index;
281 hashValues[names_count++] = hash;
282 if (names_count == SymbolTable::symbol_alloc_batch_size) {
283 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
284 names_count = 0;
285 }
286 } else {
287 _cp->symbol_at_put(index, result);
288 }
289 }
290 break;
291 default:
292 classfile_parse_error(
293 "Unknown constant tag %u in class file %s", tag, CHECK);
294 break;
295 }
296 }
297
298 // Allocate the remaining symbols
299 if (names_count > 0) {
300 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
301 }
302
303 // Copy _current pointer of local copy back to stream().
304 #ifdef ASSERT
305 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
306 #endif
307 cfs0->set_current(cfs1.current());
308 }
309
310 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
311
312 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
313 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
314 return cp->symbol_at(index);
315 else
316 return NULL;
317 }
318
319 #ifdef ASSERT
320 PRAGMA_DIAG_PUSH
321 PRAGMA_FORMAT_NONLITERAL_IGNORED
322 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) {
323 ResourceMark rm(THREAD);
324 fatal(msg, _class_name->as_C_string());
325 }
326
327 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) {
328 ResourceMark rm(THREAD);
329 fatal(msg, index, _class_name->as_C_string());
330 }
331 PRAGMA_DIAG_POP
332 #endif
333
334 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
335 ClassFileStream* cfs = stream();
336 constantPoolHandle nullHandle;
337
338 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
339 u2 length = cfs->get_u2_fast();
340 guarantee_property(
341 length >= 1, "Illegal constant pool size %u in class file %s",
342 length, CHECK_(nullHandle));
343 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
344 CHECK_(nullHandle));
345 _cp = constant_pool; // save in case of errors
346 constantPoolHandle cp (THREAD, constant_pool);
347
348 // parsing constant pool entries
349 parse_constant_pool_entries(length, CHECK_(nullHandle));
350
351 int index = 1; // declared outside of loops for portability
352
353 // first verification pass - validate cross references and fixup class and string constants
354 for (index = 1; index < length; index++) { // Index 0 is unused
355 jbyte tag = cp->tag_at(index).value();
356 switch (tag) {
357 case JVM_CONSTANT_Class :
358 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
359 break;
360 case JVM_CONSTANT_Fieldref :
361 // fall through
362 case JVM_CONSTANT_Methodref :
363 // fall through
364 case JVM_CONSTANT_InterfaceMethodref : {
365 if (!_need_verify) break;
366 int klass_ref_index = cp->klass_ref_index_at(index);
367 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
368 check_property(valid_klass_reference_at(klass_ref_index),
369 "Invalid constant pool index %u in class file %s",
370 klass_ref_index,
371 CHECK_(nullHandle));
372 check_property(valid_cp_range(name_and_type_ref_index, length) &&
373 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
374 "Invalid constant pool index %u in class file %s",
375 name_and_type_ref_index,
376 CHECK_(nullHandle));
377 break;
378 }
379 case JVM_CONSTANT_String :
380 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
381 break;
382 case JVM_CONSTANT_Integer :
383 break;
384 case JVM_CONSTANT_Float :
385 break;
386 case JVM_CONSTANT_Long :
387 case JVM_CONSTANT_Double :
388 index++;
389 check_property(
390 (index < length && cp->tag_at(index).is_invalid()),
391 "Improper constant pool long/double index %u in class file %s",
392 index, CHECK_(nullHandle));
393 break;
394 case JVM_CONSTANT_NameAndType : {
395 if (!_need_verify) break;
396 int name_ref_index = cp->name_ref_index_at(index);
397 int signature_ref_index = cp->signature_ref_index_at(index);
398 check_property(valid_symbol_at(name_ref_index),
399 "Invalid constant pool index %u in class file %s",
400 name_ref_index, CHECK_(nullHandle));
401 check_property(valid_symbol_at(signature_ref_index),
402 "Invalid constant pool index %u in class file %s",
403 signature_ref_index, CHECK_(nullHandle));
404 break;
405 }
406 case JVM_CONSTANT_Utf8 :
407 break;
408 case JVM_CONSTANT_UnresolvedClass : // fall-through
409 case JVM_CONSTANT_UnresolvedClassInError:
410 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
411 break;
412 case JVM_CONSTANT_ClassIndex :
413 {
414 int class_index = cp->klass_index_at(index);
415 check_property(valid_symbol_at(class_index),
416 "Invalid constant pool index %u in class file %s",
417 class_index, CHECK_(nullHandle));
418 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
419 }
420 break;
421 case JVM_CONSTANT_StringIndex :
422 {
423 int string_index = cp->string_index_at(index);
424 check_property(valid_symbol_at(string_index),
425 "Invalid constant pool index %u in class file %s",
426 string_index, CHECK_(nullHandle));
427 Symbol* sym = cp->symbol_at(string_index);
428 cp->unresolved_string_at_put(index, sym);
429 }
430 break;
431 case JVM_CONSTANT_MethodHandle :
432 {
433 int ref_index = cp->method_handle_index_at(index);
434 check_property(
435 valid_cp_range(ref_index, length),
436 "Invalid constant pool index %u in class file %s",
437 ref_index, CHECK_(nullHandle));
438 constantTag tag = cp->tag_at(ref_index);
439 int ref_kind = cp->method_handle_ref_kind_at(index);
440 switch (ref_kind) {
441 case JVM_REF_getField:
442 case JVM_REF_getStatic:
443 case JVM_REF_putField:
444 case JVM_REF_putStatic:
445 check_property(
446 tag.is_field(),
447 "Invalid constant pool index %u in class file %s (not a field)",
448 ref_index, CHECK_(nullHandle));
449 break;
450 case JVM_REF_invokeVirtual:
451 case JVM_REF_newInvokeSpecial:
452 check_property(
453 tag.is_method(),
454 "Invalid constant pool index %u in class file %s (not a method)",
455 ref_index, CHECK_(nullHandle));
456 break;
457 case JVM_REF_invokeStatic:
458 case JVM_REF_invokeSpecial:
459 check_property(tag.is_method() ||
460 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
461 "Invalid constant pool index %u in class file %s (not a method)",
462 ref_index, CHECK_(nullHandle));
463 break;
464 case JVM_REF_invokeInterface:
465 check_property(
466 tag.is_interface_method(),
467 "Invalid constant pool index %u in class file %s (not an interface method)",
468 ref_index, CHECK_(nullHandle));
469 break;
470 default:
471 classfile_parse_error(
472 "Bad method handle kind at constant pool index %u in class file %s",
473 index, CHECK_(nullHandle));
474 }
475 // Keep the ref_index unchanged. It will be indirected at link-time.
476 }
477 break;
478 case JVM_CONSTANT_MethodType :
479 {
480 int ref_index = cp->method_type_index_at(index);
481 check_property(valid_symbol_at(ref_index),
482 "Invalid constant pool index %u in class file %s",
483 ref_index, CHECK_(nullHandle));
484 }
485 break;
486 case JVM_CONSTANT_InvokeDynamic :
487 {
488 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
489 check_property(valid_cp_range(name_and_type_ref_index, length) &&
490 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
491 "Invalid constant pool index %u in class file %s",
492 name_and_type_ref_index,
493 CHECK_(nullHandle));
494 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
495 break;
496 }
497 default:
498 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
499 ShouldNotReachHere();
500 break;
501 } // end of switch
502 } // end of for
503
504 if (_cp_patches != NULL) {
505 // need to treat this_class specially...
506 int this_class_index;
507 {
508 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
509 u1* mark = cfs->current();
510 u2 flags = cfs->get_u2_fast();
511 this_class_index = cfs->get_u2_fast();
512 cfs->set_current(mark); // revert to mark
513 }
514
515 for (index = 1; index < length; index++) { // Index 0 is unused
516 if (has_cp_patch_at(index)) {
517 guarantee_property(index != this_class_index,
518 "Illegal constant pool patch to self at %d in class file %s",
519 index, CHECK_(nullHandle));
520 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
521 }
522 }
523 }
524
525 if (!_need_verify) {
526 return cp;
527 }
528
529 // second verification pass - checks the strings are of the right format.
530 // but not yet to the other entries
531 for (index = 1; index < length; index++) {
532 jbyte tag = cp->tag_at(index).value();
533 switch (tag) {
534 case JVM_CONSTANT_UnresolvedClass: {
535 Symbol* class_name = cp->klass_name_at(index);
536 // check the name, even if _cp_patches will overwrite it
537 verify_legal_class_name(class_name, CHECK_(nullHandle));
538 break;
539 }
540 case JVM_CONSTANT_NameAndType: {
541 if (_need_verify && _major_version >= JAVA_7_VERSION) {
542 int sig_index = cp->signature_ref_index_at(index);
543 int name_index = cp->name_ref_index_at(index);
544 Symbol* name = cp->symbol_at(name_index);
545 Symbol* sig = cp->symbol_at(sig_index);
546 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
547 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
548 } else {
549 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
550 }
551 }
552 break;
553 }
554 case JVM_CONSTANT_InvokeDynamic:
555 case JVM_CONSTANT_Fieldref:
556 case JVM_CONSTANT_Methodref:
557 case JVM_CONSTANT_InterfaceMethodref: {
558 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
559 // already verified to be utf8
560 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
561 // already verified to be utf8
562 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
563 Symbol* name = cp->symbol_at(name_ref_index);
564 Symbol* signature = cp->symbol_at(signature_ref_index);
565 if (tag == JVM_CONSTANT_Fieldref) {
566 verify_legal_field_name(name, CHECK_(nullHandle));
567 if (_need_verify && _major_version >= JAVA_7_VERSION) {
568 // Signature is verified above, when iterating NameAndType_info.
569 // Need only to be sure it's the right type.
570 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
571 throwIllegalSignature(
572 "Field", name, signature, CHECK_(nullHandle));
573 }
574 } else {
575 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
576 }
577 } else {
578 verify_legal_method_name(name, CHECK_(nullHandle));
579 if (_need_verify && _major_version >= JAVA_7_VERSION) {
580 // Signature is verified above, when iterating NameAndType_info.
581 // Need only to be sure it's the right type.
582 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
583 throwIllegalSignature(
584 "Method", name, signature, CHECK_(nullHandle));
585 }
586 } else {
587 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
588 }
589 if (tag == JVM_CONSTANT_Methodref) {
590 // 4509014: If a class method name begins with '<', it must be "<init>".
591 assert(name != NULL, "method name in constant pool is null");
592 unsigned int name_len = name->utf8_length();
593 assert(name_len > 0, "bad method name"); // already verified as legal name
594 if (name->byte_at(0) == '<') {
595 if (name != vmSymbols::object_initializer_name()) {
596 classfile_parse_error(
597 "Bad method name at constant pool index %u in class file %s",
598 name_ref_index, CHECK_(nullHandle));
599 }
600 }
601 }
602 }
603 break;
604 }
605 case JVM_CONSTANT_MethodHandle: {
606 int ref_index = cp->method_handle_index_at(index);
607 int ref_kind = cp->method_handle_ref_kind_at(index);
608 switch (ref_kind) {
609 case JVM_REF_invokeVirtual:
610 case JVM_REF_invokeStatic:
611 case JVM_REF_invokeSpecial:
612 case JVM_REF_newInvokeSpecial:
613 {
614 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
615 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
616 Symbol* name = cp->symbol_at(name_ref_index);
617 if (ref_kind == JVM_REF_newInvokeSpecial) {
618 if (name != vmSymbols::object_initializer_name()) {
619 classfile_parse_error(
620 "Bad constructor name at constant pool index %u in class file %s",
621 name_ref_index, CHECK_(nullHandle));
622 }
623 } else {
624 if (name == vmSymbols::object_initializer_name()) {
625 classfile_parse_error(
626 "Bad method name at constant pool index %u in class file %s",
627 name_ref_index, CHECK_(nullHandle));
628 }
629 }
630 }
631 break;
632 // Other ref_kinds are already fully checked in previous pass.
633 }
634 break;
635 }
636 case JVM_CONSTANT_MethodType: {
637 Symbol* no_name = vmSymbols::type_name(); // place holder
638 Symbol* signature = cp->method_type_signature_at(index);
639 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
640 break;
641 }
642 case JVM_CONSTANT_Utf8: {
643 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
644 }
645 } // end of switch
646 } // end of for
647
648 return cp;
649 }
650
651
652 void ClassFileParser::patch_constant_pool(const constantPoolHandle& cp, int index, Handle patch, TRAPS) {
653 BasicType patch_type = T_VOID;
654
655 switch (cp->tag_at(index).value()) {
656
657 case JVM_CONSTANT_UnresolvedClass :
658 // Patching a class means pre-resolving it.
659 // The name in the constant pool is ignored.
660 if (java_lang_Class::is_instance(patch())) {
661 guarantee_property(!java_lang_Class::is_primitive(patch()),
662 "Illegal class patch at %d in class file %s",
663 index, CHECK);
664 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
665 } else {
666 guarantee_property(java_lang_String::is_instance(patch()),
667 "Illegal class patch at %d in class file %s",
668 index, CHECK);
669 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
670 cp->unresolved_klass_at_put(index, name);
671 }
672 break;
673
674 case JVM_CONSTANT_String :
675 // skip this patch and don't clear it. Needs the oop array for resolved
676 // references to be created first.
677 return;
678
679 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
680 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
681 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
682 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
683 patch_prim:
684 {
685 jvalue value;
686 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
687 guarantee_property(value_type == patch_type,
688 "Illegal primitive patch at %d in class file %s",
689 index, CHECK);
690 switch (value_type) {
691 case T_INT: cp->int_at_put(index, value.i); break;
692 case T_FLOAT: cp->float_at_put(index, value.f); break;
693 case T_LONG: cp->long_at_put(index, value.j); break;
694 case T_DOUBLE: cp->double_at_put(index, value.d); break;
695 default: assert(false, "");
696 }
697 }
698 break;
699
700 default:
701 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
702 guarantee_property(!has_cp_patch_at(index),
703 "Illegal unexpected patch at %d in class file %s",
704 index, CHECK);
705 return;
706 }
707
708 // On fall-through, mark the patch as used.
709 clear_cp_patch_at(index);
710 }
711
712
713 class NameSigHash: public ResourceObj {
714 public:
715 Symbol* _name; // name
716 Symbol* _sig; // signature
717 NameSigHash* _next; // Next entry in hash table
718 };
719
720
721 #define HASH_ROW_SIZE 256
722
723 unsigned int hash(Symbol* name, Symbol* sig) {
724 unsigned int raw_hash = 0;
725 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
726 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
727
728 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
729 }
730
731
732 void initialize_hashtable(NameSigHash** table) {
733 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
734 }
735
736 // Return false if the name/sig combination is found in table.
737 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
738 // The old format checker uses heap sort to find duplicates.
739 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
740 // of table since we don't expect Symbol*'s to move.
741 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
742 assert(name != NULL, "name in constant pool is NULL");
743
744 // First lookup for duplicates
745 int index = hash(name, sig);
746 NameSigHash* entry = table[index];
747 while (entry != NULL) {
748 if (entry->_name == name && entry->_sig == sig) {
749 return false;
750 }
751 entry = entry->_next;
752 }
753
754 // No duplicate is found, allocate a new entry and fill it.
755 entry = new NameSigHash();
756 entry->_name = name;
757 entry->_sig = sig;
758
759 // Insert into hash table
760 entry->_next = table[index];
761 table[index] = entry;
762
763 return true;
764 }
765
766
767 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
768 Handle protection_domain,
769 Symbol* class_name,
770 bool* has_default_methods,
771 TRAPS) {
772 if (length == 0) {
773 _local_interfaces = Universe::the_empty_klass_array();
774 } else {
775 ClassFileStream* cfs = stream();
776 assert(length > 0, "only called for length>0");
777 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
778
779 int index;
780 for (index = 0; index < length; index++) {
781 u2 interface_index = cfs->get_u2(CHECK_NULL);
782 KlassHandle interf;
783 check_property(
784 valid_klass_reference_at(interface_index),
785 "Interface name has bad constant pool index %u in class file %s",
786 interface_index, CHECK_NULL);
787 if (_cp->tag_at(interface_index).is_klass()) {
788 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
789 } else {
790 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
791
792 // Don't need to check legal name because it's checked when parsing constant pool.
793 // But need to make sure it's not an array type.
794 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
795 "Bad interface name in class file %s", CHECK_NULL);
796 Handle class_loader(THREAD, _loader_data->class_loader());
797
798 // Call resolve_super so classcircularity is checked
799 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
800 unresolved_klass, class_loader, protection_domain,
801 false, CHECK_NULL);
802 interf = KlassHandle(THREAD, k);
803 }
804
805 if (!interf()->is_interface()) {
806 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
807 }
808 if (InstanceKlass::cast(interf())->has_default_methods()) {
809 *has_default_methods = true;
810 }
811 _local_interfaces->at_put(index, interf());
812 }
813
814 if (!_need_verify || length <= 1) {
815 return _local_interfaces;
816 }
817
818 // Check if there's any duplicates in interfaces
819 ResourceMark rm(THREAD);
820 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
821 THREAD, NameSigHash*, HASH_ROW_SIZE);
822 initialize_hashtable(interface_names);
823 bool dup = false;
824 {
825 debug_only(No_Safepoint_Verifier nsv;)
826 for (index = 0; index < length; index++) {
827 Klass* k = _local_interfaces->at(index);
828 Symbol* name = k->name();
829 // If no duplicates, add (name, NULL) in hashtable interface_names.
830 if (!put_after_lookup(name, NULL, interface_names)) {
831 dup = true;
832 break;
833 }
834 }
835 }
836 if (dup) {
837 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
838 }
839 }
840 return _local_interfaces;
841 }
842
843
844 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
845 // Make sure the constant pool entry is of a type appropriate to this field
846 guarantee_property(
847 (constantvalue_index > 0 &&
848 constantvalue_index < _cp->length()),
849 "Bad initial value index %u in ConstantValue attribute in class file %s",
850 constantvalue_index, CHECK);
851 constantTag value_type = _cp->tag_at(constantvalue_index);
852 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
853 case T_LONG:
854 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
855 break;
856 case T_FLOAT:
857 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
858 break;
859 case T_DOUBLE:
860 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
861 break;
862 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
863 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
864 break;
865 case T_OBJECT:
866 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
867 && value_type.is_string()),
868 "Bad string initial value in class file %s", CHECK);
869 break;
870 default:
871 classfile_parse_error(
872 "Unable to set initial value %u in class file %s",
873 constantvalue_index, CHECK);
874 }
875 }
876
877
878 // Parse attributes for a field.
879 void ClassFileParser::parse_field_attributes(u2 attributes_count,
880 bool is_static, u2 signature_index,
881 u2* constantvalue_index_addr,
882 bool* is_synthetic_addr,
883 u2* generic_signature_index_addr,
884 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
885 TRAPS) {
886 ClassFileStream* cfs = stream();
887 assert(attributes_count > 0, "length should be greater than 0");
888 u2 constantvalue_index = 0;
889 u2 generic_signature_index = 0;
890 bool is_synthetic = false;
891 u1* runtime_visible_annotations = NULL;
892 int runtime_visible_annotations_length = 0;
893 u1* runtime_invisible_annotations = NULL;
894 int runtime_invisible_annotations_length = 0;
895 u1* runtime_visible_type_annotations = NULL;
896 int runtime_visible_type_annotations_length = 0;
897 u1* runtime_invisible_type_annotations = NULL;
898 int runtime_invisible_type_annotations_length = 0;
899 bool runtime_invisible_annotations_exists = false;
900 bool runtime_invisible_type_annotations_exists = false;
901 while (attributes_count--) {
902 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
903 u2 attribute_name_index = cfs->get_u2_fast();
904 u4 attribute_length = cfs->get_u4_fast();
905 check_property(valid_symbol_at(attribute_name_index),
906 "Invalid field attribute index %u in class file %s",
907 attribute_name_index,
908 CHECK);
909 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
910 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
911 // ignore if non-static
912 if (constantvalue_index != 0) {
913 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
914 }
915 check_property(
916 attribute_length == 2,
917 "Invalid ConstantValue field attribute length %u in class file %s",
918 attribute_length, CHECK);
919 constantvalue_index = cfs->get_u2(CHECK);
920 if (_need_verify) {
921 verify_constantvalue(constantvalue_index, signature_index, CHECK);
922 }
923 } else if (attribute_name == vmSymbols::tag_synthetic()) {
924 if (attribute_length != 0) {
925 classfile_parse_error(
926 "Invalid Synthetic field attribute length %u in class file %s",
927 attribute_length, CHECK);
928 }
929 is_synthetic = true;
930 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
931 if (attribute_length != 0) {
932 classfile_parse_error(
933 "Invalid Deprecated field attribute length %u in class file %s",
934 attribute_length, CHECK);
935 }
936 } else if (_major_version >= JAVA_1_5_VERSION) {
937 if (attribute_name == vmSymbols::tag_signature()) {
938 if (attribute_length != 2) {
939 classfile_parse_error(
940 "Wrong size %u for field's Signature attribute in class file %s",
941 attribute_length, CHECK);
942 }
943 generic_signature_index = parse_generic_signature_attribute(CHECK);
944 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
945 if (runtime_visible_annotations != NULL) {
946 classfile_parse_error(
947 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
948 }
949 runtime_visible_annotations_length = attribute_length;
950 runtime_visible_annotations = cfs->get_u1_buffer();
951 assert(runtime_visible_annotations != NULL, "null visible annotations");
952 parse_annotations(runtime_visible_annotations,
953 runtime_visible_annotations_length,
954 parsed_annotations);
955 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
956 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
957 if (runtime_invisible_annotations_exists) {
958 classfile_parse_error(
959 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
960 }
961 runtime_invisible_annotations_exists = true;
962 if (PreserveAllAnnotations) {
963 runtime_invisible_annotations_length = attribute_length;
964 runtime_invisible_annotations = cfs->get_u1_buffer();
965 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
966 }
967 cfs->skip_u1(attribute_length, CHECK);
968 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
969 if (runtime_visible_type_annotations != NULL) {
970 classfile_parse_error(
971 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
972 }
973 runtime_visible_type_annotations_length = attribute_length;
974 runtime_visible_type_annotations = cfs->get_u1_buffer();
975 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
976 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
977 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
978 if (runtime_invisible_type_annotations_exists) {
979 classfile_parse_error(
980 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
981 } else {
982 runtime_invisible_type_annotations_exists = true;
983 }
984 if (PreserveAllAnnotations) {
985 runtime_invisible_type_annotations_length = attribute_length;
986 runtime_invisible_type_annotations = cfs->get_u1_buffer();
987 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
988 }
989 cfs->skip_u1(attribute_length, CHECK);
990 } else {
991 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
992 }
993 } else {
994 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
995 }
996 }
997
998 *constantvalue_index_addr = constantvalue_index;
999 *is_synthetic_addr = is_synthetic;
1000 *generic_signature_index_addr = generic_signature_index;
1001 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1002 runtime_visible_annotations_length,
1003 runtime_invisible_annotations,
1004 runtime_invisible_annotations_length,
1005 CHECK);
1006 parsed_annotations->set_field_annotations(a);
1007 a = assemble_annotations(runtime_visible_type_annotations,
1008 runtime_visible_type_annotations_length,
1009 runtime_invisible_type_annotations,
1010 runtime_invisible_type_annotations_length,
1011 CHECK);
1012 parsed_annotations->set_field_type_annotations(a);
1013 return;
1014 }
1015
1016
1017 // Field allocation types. Used for computing field offsets.
1018
1019 enum FieldAllocationType {
1020 STATIC_OOP, // Oops
1021 STATIC_BYTE, // Boolean, Byte, char
1022 STATIC_SHORT, // shorts
1023 STATIC_WORD, // ints
1024 STATIC_DOUBLE, // aligned long or double
1025 NONSTATIC_OOP,
1026 NONSTATIC_BYTE,
1027 NONSTATIC_SHORT,
1028 NONSTATIC_WORD,
1029 NONSTATIC_DOUBLE,
1030 MAX_FIELD_ALLOCATION_TYPE,
1031 BAD_ALLOCATION_TYPE = -1
1032 };
1033
1034 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1035 BAD_ALLOCATION_TYPE, // 0
1036 BAD_ALLOCATION_TYPE, // 1
1037 BAD_ALLOCATION_TYPE, // 2
1038 BAD_ALLOCATION_TYPE, // 3
1039 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1040 NONSTATIC_SHORT, // T_CHAR = 5,
1041 NONSTATIC_WORD, // T_FLOAT = 6,
1042 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1043 NONSTATIC_BYTE, // T_BYTE = 8,
1044 NONSTATIC_SHORT, // T_SHORT = 9,
1045 NONSTATIC_WORD, // T_INT = 10,
1046 NONSTATIC_DOUBLE, // T_LONG = 11,
1047 NONSTATIC_OOP, // T_OBJECT = 12,
1048 NONSTATIC_OOP, // T_ARRAY = 13,
1049 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1050 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1051 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1052 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1053 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1054 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1055 BAD_ALLOCATION_TYPE, // 0
1056 BAD_ALLOCATION_TYPE, // 1
1057 BAD_ALLOCATION_TYPE, // 2
1058 BAD_ALLOCATION_TYPE, // 3
1059 STATIC_BYTE , // T_BOOLEAN = 4,
1060 STATIC_SHORT, // T_CHAR = 5,
1061 STATIC_WORD, // T_FLOAT = 6,
1062 STATIC_DOUBLE, // T_DOUBLE = 7,
1063 STATIC_BYTE, // T_BYTE = 8,
1064 STATIC_SHORT, // T_SHORT = 9,
1065 STATIC_WORD, // T_INT = 10,
1066 STATIC_DOUBLE, // T_LONG = 11,
1067 STATIC_OOP, // T_OBJECT = 12,
1068 STATIC_OOP, // T_ARRAY = 13,
1069 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1070 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1071 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1072 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1073 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1074 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1075 };
1076
1077 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1078 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1079 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1080 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1081 return result;
1082 }
1083
1084 class FieldAllocationCount: public ResourceObj {
1085 public:
1086 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1087
1088 FieldAllocationCount() {
1089 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1090 count[i] = 0;
1091 }
1092 }
1093
1094 FieldAllocationType update(bool is_static, BasicType type) {
1095 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1096 // Make sure there is no overflow with injected fields.
1097 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1098 count[atype]++;
1099 return atype;
1100 }
1101 };
1102
1103 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1104 bool is_interface,
1105 FieldAllocationCount *fac,
1106 u2* java_fields_count_ptr, TRAPS) {
1107 ClassFileStream* cfs = stream();
1108 cfs->guarantee_more(2, CHECK_NULL); // length
1109 u2 length = cfs->get_u2_fast();
1110 *java_fields_count_ptr = length;
1111
1112 int num_injected = 0;
1113 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1114 int total_fields = length + num_injected;
1115
1116 // The field array starts with tuples of shorts
1117 // [access, name index, sig index, initial value index, byte offset].
1118 // A generic signature slot only exists for field with generic
1119 // signature attribute. And the access flag is set with
1120 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1121 // signature slots are at the end of the field array and after all
1122 // other fields data.
1123 //
1124 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1125 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1126 // ...
1127 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1128 // [generic signature index]
1129 // [generic signature index]
1130 // ...
1131 //
1132 // Allocate a temporary resource array for field data. For each field,
1133 // a slot is reserved in the temporary array for the generic signature
1134 // index. After parsing all fields, the data are copied to a permanent
1135 // array and any unused slots will be discarded.
1136 ResourceMark rm(THREAD);
1137 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1138 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1139
1140 // The generic signature slots start after all other fields' data.
1141 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1142 int num_generic_signature = 0;
1143 for (int n = 0; n < length; n++) {
1144 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1145
1146 AccessFlags access_flags;
1147 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1148 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1149 access_flags.set_flags(flags);
1150
1151 u2 name_index = cfs->get_u2_fast();
1152 int cp_size = _cp->length();
1153 check_property(valid_symbol_at(name_index),
1154 "Invalid constant pool index %u for field name in class file %s",
1155 name_index,
1156 CHECK_NULL);
1157 Symbol* name = _cp->symbol_at(name_index);
1158 verify_legal_field_name(name, CHECK_NULL);
1159
1160 u2 signature_index = cfs->get_u2_fast();
1161 check_property(valid_symbol_at(signature_index),
1162 "Invalid constant pool index %u for field signature in class file %s",
1163 signature_index, CHECK_NULL);
1164 Symbol* sig = _cp->symbol_at(signature_index);
1165 verify_legal_field_signature(name, sig, CHECK_NULL);
1166
1167 u2 constantvalue_index = 0;
1168 bool is_synthetic = false;
1169 u2 generic_signature_index = 0;
1170 bool is_static = access_flags.is_static();
1171 FieldAnnotationCollector parsed_annotations(_loader_data);
1172
1173 u2 attributes_count = cfs->get_u2_fast();
1174 if (attributes_count > 0) {
1175 parse_field_attributes(attributes_count, is_static, signature_index,
1176 &constantvalue_index, &is_synthetic,
1177 &generic_signature_index, &parsed_annotations,
1178 CHECK_NULL);
1179 if (parsed_annotations.field_annotations() != NULL) {
1180 if (_fields_annotations == NULL) {
1181 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1182 _loader_data, length, NULL,
1183 CHECK_NULL);
1184 }
1185 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1186 parsed_annotations.set_field_annotations(NULL);
1187 }
1188 if (parsed_annotations.field_type_annotations() != NULL) {
1189 if (_fields_type_annotations == NULL) {
1190 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1191 _loader_data, length, NULL,
1192 CHECK_NULL);
1193 }
1194 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1195 parsed_annotations.set_field_type_annotations(NULL);
1196 }
1197
1198 if (is_synthetic) {
1199 access_flags.set_is_synthetic();
1200 }
1201 if (generic_signature_index != 0) {
1202 access_flags.set_field_has_generic_signature();
1203 fa[generic_signature_slot] = generic_signature_index;
1204 generic_signature_slot ++;
1205 num_generic_signature ++;
1206 }
1207 }
1208
1209 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1210 field->initialize(access_flags.as_short(),
1211 name_index,
1212 signature_index,
1213 constantvalue_index);
1214 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1215
1216 // Remember how many oops we encountered and compute allocation type
1217 FieldAllocationType atype = fac->update(is_static, type);
1218 field->set_allocation_type(atype);
1219
1220 // After field is initialized with type, we can augment it with aux info
1221 if (parsed_annotations.has_any_annotations())
1222 parsed_annotations.apply_to(field);
1223 }
1224
1225 int index = length;
1226 if (num_injected != 0) {
1227 for (int n = 0; n < num_injected; n++) {
1228 // Check for duplicates
1229 if (injected[n].may_be_java) {
1230 Symbol* name = injected[n].name();
1231 Symbol* signature = injected[n].signature();
1232 bool duplicate = false;
1233 for (int i = 0; i < length; i++) {
1234 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1235 if (name == _cp->symbol_at(f->name_index()) &&
1236 signature == _cp->symbol_at(f->signature_index())) {
1237 // Symbol is desclared in Java so skip this one
1238 duplicate = true;
1239 break;
1240 }
1241 }
1242 if (duplicate) {
1243 // These will be removed from the field array at the end
1244 continue;
1245 }
1246 }
1247
1248 // Injected field
1249 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1250 field->initialize(JVM_ACC_FIELD_INTERNAL,
1251 injected[n].name_index,
1252 injected[n].signature_index,
1253 0);
1254
1255 BasicType type = FieldType::basic_type(injected[n].signature());
1256
1257 // Remember how many oops we encountered and compute allocation type
1258 FieldAllocationType atype = fac->update(false, type);
1259 field->set_allocation_type(atype);
1260 index++;
1261 }
1262 }
1263
1264 // Now copy the fields' data from the temporary resource array.
1265 // Sometimes injected fields already exist in the Java source so
1266 // the fields array could be too long. In that case the
1267 // fields array is trimed. Also unused slots that were reserved
1268 // for generic signature indexes are discarded.
1269 Array<u2>* fields = MetadataFactory::new_array<u2>(
1270 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1271 CHECK_NULL);
1272 _fields = fields; // save in case of error
1273 {
1274 int i = 0;
1275 for (; i < index * FieldInfo::field_slots; i++) {
1276 fields->at_put(i, fa[i]);
1277 }
1278 for (int j = total_fields * FieldInfo::field_slots;
1279 j < generic_signature_slot; j++) {
1280 fields->at_put(i++, fa[j]);
1281 }
1282 assert(i == fields->length(), "");
1283 }
1284
1285 if (_need_verify && length > 1) {
1286 // Check duplicated fields
1287 ResourceMark rm(THREAD);
1288 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1289 THREAD, NameSigHash*, HASH_ROW_SIZE);
1290 initialize_hashtable(names_and_sigs);
1291 bool dup = false;
1292 {
1293 debug_only(No_Safepoint_Verifier nsv;)
1294 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1295 Symbol* name = fs.name();
1296 Symbol* sig = fs.signature();
1297 // If no duplicates, add name/signature in hashtable names_and_sigs.
1298 if (!put_after_lookup(name, sig, names_and_sigs)) {
1299 dup = true;
1300 break;
1301 }
1302 }
1303 }
1304 if (dup) {
1305 classfile_parse_error("Duplicate field name&signature in class file %s",
1306 CHECK_NULL);
1307 }
1308 }
1309
1310 return fields;
1311 }
1312
1313
1314 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1315 while (length-- > 0) {
1316 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1317 }
1318 }
1319
1320
1321 u2* ClassFileParser::parse_exception_table(u4 code_length,
1322 u4 exception_table_length,
1323 TRAPS) {
1324 ClassFileStream* cfs = stream();
1325
1326 u2* exception_table_start = cfs->get_u2_buffer();
1327 assert(exception_table_start != NULL, "null exception table");
1328 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1329 // Will check legal target after parsing code array in verifier.
1330 if (_need_verify) {
1331 for (unsigned int i = 0; i < exception_table_length; i++) {
1332 u2 start_pc = cfs->get_u2_fast();
1333 u2 end_pc = cfs->get_u2_fast();
1334 u2 handler_pc = cfs->get_u2_fast();
1335 u2 catch_type_index = cfs->get_u2_fast();
1336 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1337 "Illegal exception table range in class file %s",
1338 CHECK_NULL);
1339 guarantee_property(handler_pc < code_length,
1340 "Illegal exception table handler in class file %s",
1341 CHECK_NULL);
1342 if (catch_type_index != 0) {
1343 guarantee_property(valid_klass_reference_at(catch_type_index),
1344 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1345 }
1346 }
1347 } else {
1348 cfs->skip_u2_fast(exception_table_length * 4);
1349 }
1350 return exception_table_start;
1351 }
1352
1353 void ClassFileParser::parse_linenumber_table(
1354 u4 code_attribute_length, u4 code_length,
1355 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1356 ClassFileStream* cfs = stream();
1357 unsigned int num_entries = cfs->get_u2(CHECK);
1358
1359 // Each entry is a u2 start_pc, and a u2 line_number
1360 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1361
1362 // Verify line number attribute and table length
1363 check_property(
1364 code_attribute_length == sizeof(u2) + length_in_bytes,
1365 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1366
1367 cfs->guarantee_more(length_in_bytes, CHECK);
1368
1369 if ((*write_stream) == NULL) {
1370 if (length_in_bytes > fixed_buffer_size) {
1371 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1372 } else {
1373 (*write_stream) = new CompressedLineNumberWriteStream(
1374 linenumbertable_buffer, fixed_buffer_size);
1375 }
1376 }
1377
1378 while (num_entries-- > 0) {
1379 u2 bci = cfs->get_u2_fast(); // start_pc
1380 u2 line = cfs->get_u2_fast(); // line_number
1381 guarantee_property(bci < code_length,
1382 "Invalid pc in LineNumberTable in class file %s", CHECK);
1383 (*write_stream)->write_pair(bci, line);
1384 }
1385 }
1386
1387
1388 class LVT_Hash : public AllStatic {
1389 public:
1390
1391 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1392 /*
1393 * 3-tuple start_bci/length/slot has to be unique key,
1394 * so the following comparison seems to be redundant:
1395 * && elem->name_cp_index == entry->_elem->name_cp_index
1396 */
1397 return (e0.start_bci == e1.start_bci &&
1398 e0.length == e1.length &&
1399 e0.name_cp_index == e1.name_cp_index &&
1400 e0.slot == e1.slot);
1401 }
1402
1403 static unsigned int hash(LocalVariableTableElement const& e0) {
1404 unsigned int raw_hash = e0.start_bci;
1405
1406 raw_hash = e0.length + raw_hash * 37;
1407 raw_hash = e0.name_cp_index + raw_hash * 37;
1408 raw_hash = e0.slot + raw_hash * 37;
1409
1410 return raw_hash;
1411 }
1412 };
1413
1414
1415 // Class file LocalVariableTable elements.
1416 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1417 public:
1418 u2 start_bci;
1419 u2 length;
1420 u2 name_cp_index;
1421 u2 descriptor_cp_index;
1422 u2 slot;
1423 };
1424
1425 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1426 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1427 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1428 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1429 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1430 lvt->signature_cp_index = 0;
1431 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1432 }
1433
1434 // Function is used to parse both attributes:
1435 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1436 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1437 u2 max_locals,
1438 u4 code_attribute_length,
1439 u2* localvariable_table_length,
1440 bool isLVTT,
1441 TRAPS) {
1442 ClassFileStream* cfs = stream();
1443 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1444 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1445 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1446 // Verify local variable table attribute has right length
1447 if (_need_verify) {
1448 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1449 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1450 }
1451 u2* localvariable_table_start = cfs->get_u2_buffer();
1452 assert(localvariable_table_start != NULL, "null local variable table");
1453 if (!_need_verify) {
1454 cfs->skip_u2_fast(size);
1455 } else {
1456 cfs->guarantee_more(size * 2, CHECK_NULL);
1457 for(int i = 0; i < (*localvariable_table_length); i++) {
1458 u2 start_pc = cfs->get_u2_fast();
1459 u2 length = cfs->get_u2_fast();
1460 u2 name_index = cfs->get_u2_fast();
1461 u2 descriptor_index = cfs->get_u2_fast();
1462 u2 index = cfs->get_u2_fast();
1463 // Assign to a u4 to avoid overflow
1464 u4 end_pc = (u4)start_pc + (u4)length;
1465
1466 if (start_pc >= code_length) {
1467 classfile_parse_error(
1468 "Invalid start_pc %u in %s in class file %s",
1469 start_pc, tbl_name, CHECK_NULL);
1470 }
1471 if (end_pc > code_length) {
1472 classfile_parse_error(
1473 "Invalid length %u in %s in class file %s",
1474 length, tbl_name, CHECK_NULL);
1475 }
1476 int cp_size = _cp->length();
1477 guarantee_property(valid_symbol_at(name_index),
1478 "Name index %u in %s has bad constant type in class file %s",
1479 name_index, tbl_name, CHECK_NULL);
1480 guarantee_property(valid_symbol_at(descriptor_index),
1481 "Signature index %u in %s has bad constant type in class file %s",
1482 descriptor_index, tbl_name, CHECK_NULL);
1483
1484 Symbol* name = _cp->symbol_at(name_index);
1485 Symbol* sig = _cp->symbol_at(descriptor_index);
1486 verify_legal_field_name(name, CHECK_NULL);
1487 u2 extra_slot = 0;
1488 if (!isLVTT) {
1489 verify_legal_field_signature(name, sig, CHECK_NULL);
1490
1491 // 4894874: check special cases for double and long local variables
1492 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1493 sig == vmSymbols::type_signature(T_LONG)) {
1494 extra_slot = 1;
1495 }
1496 }
1497 guarantee_property((index + extra_slot) < max_locals,
1498 "Invalid index %u in %s in class file %s",
1499 index, tbl_name, CHECK_NULL);
1500 }
1501 }
1502 return localvariable_table_start;
1503 }
1504
1505
1506 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1507 u1* u1_array, u2* u2_array, TRAPS) {
1508 ClassFileStream* cfs = stream();
1509 u2 index = 0; // index in the array with long/double occupying two slots
1510 u4 i1 = *u1_index;
1511 u4 i2 = *u2_index + 1;
1512 for(int i = 0; i < array_length; i++) {
1513 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1514 index++;
1515 if (tag == ITEM_Long || tag == ITEM_Double) {
1516 index++;
1517 } else if (tag == ITEM_Object) {
1518 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1519 guarantee_property(valid_klass_reference_at(class_index),
1520 "Bad class index %u in StackMap in class file %s",
1521 class_index, CHECK);
1522 } else if (tag == ITEM_Uninitialized) {
1523 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1524 guarantee_property(
1525 offset < code_length,
1526 "Bad uninitialized type offset %u in StackMap in class file %s",
1527 offset, CHECK);
1528 } else {
1529 guarantee_property(
1530 tag <= (u1)ITEM_Uninitialized,
1531 "Unknown variable type %u in StackMap in class file %s",
1532 tag, CHECK);
1533 }
1534 }
1535 u2_array[*u2_index] = index;
1536 *u1_index = i1;
1537 *u2_index = i2;
1538 }
1539
1540 u1* ClassFileParser::parse_stackmap_table(
1541 u4 code_attribute_length, TRAPS) {
1542 if (code_attribute_length == 0)
1543 return NULL;
1544
1545 ClassFileStream* cfs = stream();
1546 u1* stackmap_table_start = cfs->get_u1_buffer();
1547 assert(stackmap_table_start != NULL, "null stackmap table");
1548
1549 // check code_attribute_length first
1550 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1551
1552 if (!_need_verify && !DumpSharedSpaces) {
1553 return NULL;
1554 }
1555 return stackmap_table_start;
1556 }
1557
1558 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1559 u4 method_attribute_length,
1560 TRAPS) {
1561 ClassFileStream* cfs = stream();
1562 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1563 *checked_exceptions_length = cfs->get_u2_fast();
1564 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1565 u2* checked_exceptions_start = cfs->get_u2_buffer();
1566 assert(checked_exceptions_start != NULL, "null checked exceptions");
1567 if (!_need_verify) {
1568 cfs->skip_u2_fast(size);
1569 } else {
1570 // Verify each value in the checked exception table
1571 u2 checked_exception;
1572 u2 len = *checked_exceptions_length;
1573 cfs->guarantee_more(2 * len, CHECK_NULL);
1574 for (int i = 0; i < len; i++) {
1575 checked_exception = cfs->get_u2_fast();
1576 check_property(
1577 valid_klass_reference_at(checked_exception),
1578 "Exception name has bad type at constant pool %u in class file %s",
1579 checked_exception, CHECK_NULL);
1580 }
1581 }
1582 // check exceptions attribute length
1583 if (_need_verify) {
1584 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1585 sizeof(u2) * size),
1586 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1587 }
1588 return checked_exceptions_start;
1589 }
1590
1591 void ClassFileParser::throwIllegalSignature(
1592 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1593 ResourceMark rm(THREAD);
1594 Exceptions::fthrow(THREAD_AND_LOCATION,
1595 vmSymbols::java_lang_ClassFormatError(),
1596 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1597 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1598 }
1599
1600 // Skip an annotation. Return >=limit if there is any problem.
1601 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1602 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1603 // value := switch (tag:u1) { ... }
1604 index += 2; // skip atype
1605 if ((index += 2) >= limit) return limit; // read nmem
1606 int nmem = Bytes::get_Java_u2(buffer+index-2);
1607 while (--nmem >= 0 && index < limit) {
1608 index += 2; // skip member
1609 index = skip_annotation_value(buffer, limit, index);
1610 }
1611 return index;
1612 }
1613
1614 // Skip an annotation value. Return >=limit if there is any problem.
1615 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1616 // value := switch (tag:u1) {
1617 // case B, C, I, S, Z, D, F, J, c: con:u2;
1618 // case e: e_class:u2 e_name:u2;
1619 // case s: s_con:u2;
1620 // case [: do(nval:u2) {value};
1621 // case @: annotation;
1622 // case s: s_con:u2;
1623 // }
1624 if ((index += 1) >= limit) return limit; // read tag
1625 u1 tag = buffer[index-1];
1626 switch (tag) {
1627 case 'B': case 'C': case 'I': case 'S': case 'Z':
1628 case 'D': case 'F': case 'J': case 'c': case 's':
1629 index += 2; // skip con or s_con
1630 break;
1631 case 'e':
1632 index += 4; // skip e_class, e_name
1633 break;
1634 case '[':
1635 {
1636 if ((index += 2) >= limit) return limit; // read nval
1637 int nval = Bytes::get_Java_u2(buffer+index-2);
1638 while (--nval >= 0 && index < limit) {
1639 index = skip_annotation_value(buffer, limit, index);
1640 }
1641 }
1642 break;
1643 case '@':
1644 index = skip_annotation(buffer, limit, index);
1645 break;
1646 default:
1647 return limit; // bad tag byte
1648 }
1649 return index;
1650 }
1651
1652 // Sift through annotations, looking for those significant to the VM:
1653 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1654 ClassFileParser::AnnotationCollector* coll) {
1655 // annotations := do(nann:u2) {annotation}
1656 int index = 0;
1657 if ((index += 2) >= limit) return; // read nann
1658 int nann = Bytes::get_Java_u2(buffer+index-2);
1659 enum { // initial annotation layout
1660 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1661 count_off = 2, // u2 such as 1 (one value)
1662 member_off = 4, // utf8 such as 'value'
1663 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1664 e_tag_val = 'e',
1665 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1666 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1667 e_size = 11, // end of 'e' annotation
1668 c_tag_val = 'c', // payload is type
1669 c_con_off = 7, // utf8 payload, such as 'I'
1670 c_size = 9, // end of 'c' annotation
1671 s_tag_val = 's', // payload is String
1672 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1673 s_size = 9,
1674 min_size = 6 // smallest possible size (zero members)
1675 };
1676 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1677 int index0 = index;
1678 index = skip_annotation(buffer, limit, index);
1679 u1* abase = buffer + index0;
1680 int atype = Bytes::get_Java_u2(abase + atype_off);
1681 int count = Bytes::get_Java_u2(abase + count_off);
1682 Symbol* aname = check_symbol_at(_cp, atype);
1683 if (aname == NULL) break; // invalid annotation name
1684 Symbol* member = NULL;
1685 if (count >= 1) {
1686 int member_index = Bytes::get_Java_u2(abase + member_off);
1687 member = check_symbol_at(_cp, member_index);
1688 if (member == NULL) break; // invalid member name
1689 }
1690
1691 // Here is where parsing particular annotations will take place.
1692 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1693 if (id == AnnotationCollector::_unknown) continue;
1694 coll->set_annotation(id);
1695
1696 if (id == AnnotationCollector::_sun_misc_Contended) {
1697 // @Contended can optionally specify the contention group.
1698 //
1699 // Contended group defines the equivalence class over the fields:
1700 // the fields within the same contended group are not treated distinct.
1701 // The only exception is default group, which does not incur the
1702 // equivalence. Naturally, contention group for classes is meaningless.
1703 //
1704 // While the contention group is specified as String, annotation
1705 // values are already interned, and we might as well use the constant
1706 // pool index as the group tag.
1707 //
1708 u2 group_index = 0; // default contended group
1709 if (count == 1
1710 && s_size == (index - index0) // match size
1711 && s_tag_val == *(abase + tag_off)
1712 && member == vmSymbols::value_name()) {
1713 group_index = Bytes::get_Java_u2(abase + s_con_off);
1714 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1715 group_index = 0; // default contended group
1716 }
1717 }
1718 coll->set_contended_group(group_index);
1719 }
1720 }
1721 }
1722
1723 ClassFileParser::AnnotationCollector::ID
1724 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1725 Symbol* name) {
1726 vmSymbols::SID sid = vmSymbols::find_sid(name);
1727 // Privileged code can use all annotations. Other code silently drops some.
1728 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1729 loader_data->is_ext_class_loader_data() ||
1730 loader_data->is_anonymous();
1731 switch (sid) {
1732 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1733 if (_location != _in_method) break; // only allow for methods
1734 if (!privileged) break; // only allow in privileged code
1735 return _method_CallerSensitive;
1736 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1737 if (_location != _in_method) break; // only allow for methods
1738 if (!privileged) break; // only allow in privileged code
1739 return _method_ForceInline;
1740 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1741 if (_location != _in_method) break; // only allow for methods
1742 if (!privileged) break; // only allow in privileged code
1743 return _method_DontInline;
1744 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1745 if (_location != _in_method) break; // only allow for methods
1746 if (!privileged) break; // only allow in privileged code
1747 return _method_InjectedProfile;
1748 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1749 if (_location != _in_method) break; // only allow for methods
1750 if (!privileged) break; // only allow in privileged code
1751 return _method_LambdaForm_Compiled;
1752 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1753 if (_location != _in_method) break; // only allow for methods
1754 if (!privileged) break; // only allow in privileged code
1755 return _method_LambdaForm_Hidden;
1756 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature):
1757 if (_location != _in_method) break; // only allow for methods
1758 if (!privileged) break; // only allow in privileged code
1759 return _method_HotSpotIntrinsicCandidate;
1760 #if INCLUDE_JVMCI
1761 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature):
1762 if (_location != _in_field) break; // only allow for fields
1763 if (!privileged) break; // only allow in privileged code
1764 return _field_Stable;
1765 #endif
1766 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1767 if (_location != _in_field) break; // only allow for fields
1768 if (!privileged) break; // only allow in privileged code
1769 return _field_Stable;
1770 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1771 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1772 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1773 return _sun_misc_Contended;
1774 default: break;
1775 }
1776 return AnnotationCollector::_unknown;
1777 }
1778
1779 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1780 if (is_contended())
1781 f->set_contended_group(contended_group());
1782 if (is_stable())
1783 f->set_stable(true);
1784 }
1785
1786 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1787 // If there's an error deallocate metadata for field annotations
1788 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1789 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1790 }
1791
1792 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1793 if (has_annotation(_method_CallerSensitive))
1794 m->set_caller_sensitive(true);
1795 if (has_annotation(_method_ForceInline))
1796 m->set_force_inline(true);
1797 if (has_annotation(_method_DontInline))
1798 m->set_dont_inline(true);
1799 if (has_annotation(_method_InjectedProfile))
1800 m->set_has_injected_profile(true);
1801 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1802 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1803 if (has_annotation(_method_LambdaForm_Hidden))
1804 m->set_hidden(true);
1805 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
1806 m->set_intrinsic_candidate(true);
1807 }
1808
1809 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1810 k->set_is_contended(is_contended());
1811 }
1812
1813
1814 #define MAX_ARGS_SIZE 255
1815 #define MAX_CODE_SIZE 65535
1816 #define INITIAL_MAX_LVT_NUMBER 256
1817
1818 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1819 *
1820 * Rules for LVT's and LVTT's are:
1821 * - There can be any number of LVT's and LVTT's.
1822 * - If there are n LVT's, it is the same as if there was just
1823 * one LVT containing all the entries from the n LVT's.
1824 * - There may be no more than one LVT entry per local variable.
1825 * Two LVT entries are 'equal' if these fields are the same:
1826 * start_pc, length, name, slot
1827 * - There may be no more than one LVTT entry per each LVT entry.
1828 * Each LVTT entry has to match some LVT entry.
1829 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1830 */
1831 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1832 int lvt_cnt,
1833 u2* localvariable_table_length,
1834 u2** localvariable_table_start,
1835 int lvtt_cnt,
1836 u2* localvariable_type_table_length,
1837 u2** localvariable_type_table_start,
1838 TRAPS) {
1839
1840 ResourceMark rm(THREAD);
1841
1842 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1843 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1844
1845 LVT_HashTable* table = new LVT_HashTable();
1846
1847 // To fill LocalVariableTable in
1848 Classfile_LVT_Element* cf_lvt;
1849 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1850
1851 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1852 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1853 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1854 copy_lvt_element(&cf_lvt[idx], lvt);
1855 // If no duplicates, add LVT elem in hashtable.
1856 if (table->put(*lvt, lvt) == false
1857 && _need_verify
1858 && _major_version >= JAVA_1_5_VERSION) {
1859 classfile_parse_error("Duplicated LocalVariableTable attribute "
1860 "entry for '%s' in class file %s",
1861 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1862 CHECK);
1863 }
1864 }
1865 }
1866
1867 // To merge LocalVariableTable and LocalVariableTypeTable
1868 Classfile_LVT_Element* cf_lvtt;
1869 LocalVariableTableElement lvtt_elem;
1870
1871 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1872 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1873 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1874 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1875 LocalVariableTableElement** entry = table->get(lvtt_elem);
1876 if (entry == NULL) {
1877 if (_need_verify) {
1878 classfile_parse_error("LVTT entry for '%s' in class file %s "
1879 "does not match any LVT entry",
1880 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1881 CHECK);
1882 }
1883 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1884 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1885 "entry for '%s' in class file %s",
1886 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1887 CHECK);
1888 } else {
1889 // to add generic signatures into LocalVariableTable
1890 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1891 }
1892 }
1893 }
1894 }
1895
1896
1897 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1898 u1* runtime_visible_annotations,
1899 int runtime_visible_annotations_length,
1900 u1* runtime_invisible_annotations,
1901 int runtime_invisible_annotations_length,
1902 u1* runtime_visible_parameter_annotations,
1903 int runtime_visible_parameter_annotations_length,
1904 u1* runtime_invisible_parameter_annotations,
1905 int runtime_invisible_parameter_annotations_length,
1906 u1* runtime_visible_type_annotations,
1907 int runtime_visible_type_annotations_length,
1908 u1* runtime_invisible_type_annotations,
1909 int runtime_invisible_type_annotations_length,
1910 u1* annotation_default,
1911 int annotation_default_length,
1912 TRAPS) {
1913
1914 AnnotationArray* a;
1915
1916 if (runtime_visible_annotations_length +
1917 runtime_invisible_annotations_length > 0) {
1918 a = assemble_annotations(runtime_visible_annotations,
1919 runtime_visible_annotations_length,
1920 runtime_invisible_annotations,
1921 runtime_invisible_annotations_length,
1922 CHECK);
1923 cm->set_method_annotations(a);
1924 }
1925
1926 if (runtime_visible_parameter_annotations_length +
1927 runtime_invisible_parameter_annotations_length > 0) {
1928 a = assemble_annotations(runtime_visible_parameter_annotations,
1929 runtime_visible_parameter_annotations_length,
1930 runtime_invisible_parameter_annotations,
1931 runtime_invisible_parameter_annotations_length,
1932 CHECK);
1933 cm->set_parameter_annotations(a);
1934 }
1935
1936 if (annotation_default_length > 0) {
1937 a = assemble_annotations(annotation_default,
1938 annotation_default_length,
1939 NULL,
1940 0,
1941 CHECK);
1942 cm->set_default_annotations(a);
1943 }
1944
1945 if (runtime_visible_type_annotations_length +
1946 runtime_invisible_type_annotations_length > 0) {
1947 a = assemble_annotations(runtime_visible_type_annotations,
1948 runtime_visible_type_annotations_length,
1949 runtime_invisible_type_annotations,
1950 runtime_invisible_type_annotations_length,
1951 CHECK);
1952 cm->set_type_annotations(a);
1953 }
1954 }
1955
1956
1957 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1958 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1959 // Method* to save footprint, so we only know the size of the resulting Method* when the
1960 // entire method attribute is parsed.
1961 //
1962 // The promoted_flags parameter is used to pass relevant access_flags
1963 // from the method back up to the containing klass. These flag values
1964 // are added to klass's access_flags.
1965
1966 methodHandle ClassFileParser::parse_method(bool is_interface,
1967 AccessFlags *promoted_flags,
1968 TRAPS) {
1969 ClassFileStream* cfs = stream();
1970 methodHandle nullHandle;
1971 ResourceMark rm(THREAD);
1972 // Parse fixed parts
1973 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1974
1975 int flags = cfs->get_u2_fast();
1976 u2 name_index = cfs->get_u2_fast();
1977 int cp_size = _cp->length();
1978 check_property(
1979 valid_symbol_at(name_index),
1980 "Illegal constant pool index %u for method name in class file %s",
1981 name_index, CHECK_(nullHandle));
1982 Symbol* name = _cp->symbol_at(name_index);
1983 verify_legal_method_name(name, CHECK_(nullHandle));
1984
1985 u2 signature_index = cfs->get_u2_fast();
1986 guarantee_property(
1987 valid_symbol_at(signature_index),
1988 "Illegal constant pool index %u for method signature in class file %s",
1989 signature_index, CHECK_(nullHandle));
1990 Symbol* signature = _cp->symbol_at(signature_index);
1991
1992 AccessFlags access_flags;
1993 if (name == vmSymbols::class_initializer_name()) {
1994 // We ignore the other access flags for a valid class initializer.
1995 // (JVM Spec 2nd ed., chapter 4.6)
1996 if (_major_version < 51) { // backward compatibility
1997 flags = JVM_ACC_STATIC;
1998 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1999 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2000 } else {
2001 // As of major_version 51, a method named <clinit> without ACC_STATIC is
2002 // just another method. So, do a normal method modifer check.
2003 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2004 }
2005 } else {
2006 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2007 }
2008
2009 if (name == vmSymbols::object_initializer_name() && is_interface) {
2010 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle));
2011 }
2012
2013 int args_size = -1; // only used when _need_verify is true
2014 if (_need_verify) {
2015 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2016 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2017 if (args_size > MAX_ARGS_SIZE) {
2018 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2019 }
2020 }
2021
2022 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2023
2024 // Default values for code and exceptions attribute elements
2025 u2 max_stack = 0;
2026 u2 max_locals = 0;
2027 u4 code_length = 0;
2028 u1* code_start = 0;
2029 u2 exception_table_length = 0;
2030 u2* exception_table_start = NULL;
2031 Array<int>* exception_handlers = Universe::the_empty_int_array();
2032 u2 checked_exceptions_length = 0;
2033 u2* checked_exceptions_start = NULL;
2034 CompressedLineNumberWriteStream* linenumber_table = NULL;
2035 int linenumber_table_length = 0;
2036 int total_lvt_length = 0;
2037 u2 lvt_cnt = 0;
2038 u2 lvtt_cnt = 0;
2039 bool lvt_allocated = false;
2040 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2041 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2042 u2* localvariable_table_length = NULL;
2043 u2** localvariable_table_start = NULL;
2044 u2* localvariable_type_table_length = NULL;
2045 u2** localvariable_type_table_start = NULL;
2046 int method_parameters_length = -1;
2047 u1* method_parameters_data = NULL;
2048 bool method_parameters_seen = false;
2049 bool parsed_code_attribute = false;
2050 bool parsed_checked_exceptions_attribute = false;
2051 bool parsed_stackmap_attribute = false;
2052 // stackmap attribute - JDK1.5
2053 u1* stackmap_data = NULL;
2054 int stackmap_data_length = 0;
2055 u2 generic_signature_index = 0;
2056 MethodAnnotationCollector parsed_annotations;
2057 u1* runtime_visible_annotations = NULL;
2058 int runtime_visible_annotations_length = 0;
2059 u1* runtime_invisible_annotations = NULL;
2060 int runtime_invisible_annotations_length = 0;
2061 u1* runtime_visible_parameter_annotations = NULL;
2062 int runtime_visible_parameter_annotations_length = 0;
2063 u1* runtime_invisible_parameter_annotations = NULL;
2064 int runtime_invisible_parameter_annotations_length = 0;
2065 u1* runtime_visible_type_annotations = NULL;
2066 int runtime_visible_type_annotations_length = 0;
2067 u1* runtime_invisible_type_annotations = NULL;
2068 int runtime_invisible_type_annotations_length = 0;
2069 bool runtime_invisible_annotations_exists = false;
2070 bool runtime_invisible_type_annotations_exists = false;
2071 bool runtime_invisible_parameter_annotations_exists = false;
2072 u1* annotation_default = NULL;
2073 int annotation_default_length = 0;
2074
2075 // Parse code and exceptions attribute
2076 u2 method_attributes_count = cfs->get_u2_fast();
2077 while (method_attributes_count--) {
2078 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2079 u2 method_attribute_name_index = cfs->get_u2_fast();
2080 u4 method_attribute_length = cfs->get_u4_fast();
2081 check_property(
2082 valid_symbol_at(method_attribute_name_index),
2083 "Invalid method attribute name index %u in class file %s",
2084 method_attribute_name_index, CHECK_(nullHandle));
2085
2086 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2087 if (method_attribute_name == vmSymbols::tag_code()) {
2088 // Parse Code attribute
2089 if (_need_verify) {
2090 guarantee_property(
2091 !access_flags.is_native() && !access_flags.is_abstract(),
2092 "Code attribute in native or abstract methods in class file %s",
2093 CHECK_(nullHandle));
2094 }
2095 if (parsed_code_attribute) {
2096 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2097 }
2098 parsed_code_attribute = true;
2099
2100 // Stack size, locals size, and code size
2101 if (_major_version == 45 && _minor_version <= 2) {
2102 cfs->guarantee_more(4, CHECK_(nullHandle));
2103 max_stack = cfs->get_u1_fast();
2104 max_locals = cfs->get_u1_fast();
2105 code_length = cfs->get_u2_fast();
2106 } else {
2107 cfs->guarantee_more(8, CHECK_(nullHandle));
2108 max_stack = cfs->get_u2_fast();
2109 max_locals = cfs->get_u2_fast();
2110 code_length = cfs->get_u4_fast();
2111 }
2112 if (_need_verify) {
2113 guarantee_property(args_size <= max_locals,
2114 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2115 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2116 "Invalid method Code length %u in class file %s",
2117 code_length, CHECK_(nullHandle));
2118 }
2119 // Code pointer
2120 code_start = cfs->get_u1_buffer();
2121 assert(code_start != NULL, "null code start");
2122 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2123 cfs->skip_u1_fast(code_length);
2124
2125 // Exception handler table
2126 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2127 exception_table_length = cfs->get_u2_fast();
2128 if (exception_table_length > 0) {
2129 exception_table_start =
2130 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2131 }
2132
2133 // Parse additional attributes in code attribute
2134 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2135 u2 code_attributes_count = cfs->get_u2_fast();
2136
2137 unsigned int calculated_attribute_length = 0;
2138
2139 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2140 calculated_attribute_length =
2141 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2142 } else {
2143 // max_stack, locals and length are smaller in pre-version 45.2 classes
2144 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2145 }
2146 calculated_attribute_length +=
2147 code_length +
2148 sizeof(exception_table_length) +
2149 sizeof(code_attributes_count) +
2150 exception_table_length *
2151 ( sizeof(u2) + // start_pc
2152 sizeof(u2) + // end_pc
2153 sizeof(u2) + // handler_pc
2154 sizeof(u2) ); // catch_type_index
2155
2156 while (code_attributes_count--) {
2157 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2158 u2 code_attribute_name_index = cfs->get_u2_fast();
2159 u4 code_attribute_length = cfs->get_u4_fast();
2160 calculated_attribute_length += code_attribute_length +
2161 sizeof(code_attribute_name_index) +
2162 sizeof(code_attribute_length);
2163 check_property(valid_symbol_at(code_attribute_name_index),
2164 "Invalid code attribute name index %u in class file %s",
2165 code_attribute_name_index,
2166 CHECK_(nullHandle));
2167 if (LoadLineNumberTables &&
2168 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2169 // Parse and compress line number table
2170 parse_linenumber_table(code_attribute_length, code_length,
2171 &linenumber_table, CHECK_(nullHandle));
2172
2173 } else if (LoadLocalVariableTables &&
2174 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2175 // Parse local variable table
2176 if (!lvt_allocated) {
2177 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2178 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2179 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2180 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2181 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2182 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2183 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2184 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2185 lvt_allocated = true;
2186 }
2187 if (lvt_cnt == max_lvt_cnt) {
2188 max_lvt_cnt <<= 1;
2189 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2190 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2191 }
2192 localvariable_table_start[lvt_cnt] =
2193 parse_localvariable_table(code_length,
2194 max_locals,
2195 code_attribute_length,
2196 &localvariable_table_length[lvt_cnt],
2197 false, // is not LVTT
2198 CHECK_(nullHandle));
2199 total_lvt_length += localvariable_table_length[lvt_cnt];
2200 lvt_cnt++;
2201 } else if (LoadLocalVariableTypeTables &&
2202 _major_version >= JAVA_1_5_VERSION &&
2203 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2204 if (!lvt_allocated) {
2205 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2206 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2207 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2208 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2209 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2210 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2211 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2212 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2213 lvt_allocated = true;
2214 }
2215 // Parse local variable type table
2216 if (lvtt_cnt == max_lvtt_cnt) {
2217 max_lvtt_cnt <<= 1;
2218 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2219 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2220 }
2221 localvariable_type_table_start[lvtt_cnt] =
2222 parse_localvariable_table(code_length,
2223 max_locals,
2224 code_attribute_length,
2225 &localvariable_type_table_length[lvtt_cnt],
2226 true, // is LVTT
2227 CHECK_(nullHandle));
2228 lvtt_cnt++;
2229 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2230 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2231 // Stack map is only needed by the new verifier in JDK1.5.
2232 if (parsed_stackmap_attribute) {
2233 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2234 }
2235 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2236 stackmap_data_length = code_attribute_length;
2237 parsed_stackmap_attribute = true;
2238 } else {
2239 // Skip unknown attributes
2240 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2241 }
2242 }
2243 // check method attribute length
2244 if (_need_verify) {
2245 guarantee_property(method_attribute_length == calculated_attribute_length,
2246 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2247 }
2248 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2249 // Parse Exceptions attribute
2250 if (parsed_checked_exceptions_attribute) {
2251 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2252 }
2253 parsed_checked_exceptions_attribute = true;
2254 checked_exceptions_start =
2255 parse_checked_exceptions(&checked_exceptions_length,
2256 method_attribute_length,
2257 CHECK_(nullHandle));
2258 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2259 // reject multiple method parameters
2260 if (method_parameters_seen) {
2261 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2262 }
2263 method_parameters_seen = true;
2264 method_parameters_length = cfs->get_u1_fast();
2265 const u2 real_length = (method_parameters_length * 4u) + 1u;
2266 if (method_attribute_length != real_length) {
2267 classfile_parse_error(
2268 "Invalid MethodParameters method attribute length %u in class file",
2269 method_attribute_length, CHECK_(nullHandle));
2270 }
2271 method_parameters_data = cfs->get_u1_buffer();
2272 cfs->skip_u2_fast(method_parameters_length);
2273 cfs->skip_u2_fast(method_parameters_length);
2274 // ignore this attribute if it cannot be reflected
2275 if (!SystemDictionary::Parameter_klass_loaded())
2276 method_parameters_length = -1;
2277 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2278 if (method_attribute_length != 0) {
2279 classfile_parse_error(
2280 "Invalid Synthetic method attribute length %u in class file %s",
2281 method_attribute_length, CHECK_(nullHandle));
2282 }
2283 // Should we check that there hasn't already been a synthetic attribute?
2284 access_flags.set_is_synthetic();
2285 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2286 if (method_attribute_length != 0) {
2287 classfile_parse_error(
2288 "Invalid Deprecated method attribute length %u in class file %s",
2289 method_attribute_length, CHECK_(nullHandle));
2290 }
2291 } else if (_major_version >= JAVA_1_5_VERSION) {
2292 if (method_attribute_name == vmSymbols::tag_signature()) {
2293 if (method_attribute_length != 2) {
2294 classfile_parse_error(
2295 "Invalid Signature attribute length %u in class file %s",
2296 method_attribute_length, CHECK_(nullHandle));
2297 }
2298 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2299 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2300 if (runtime_visible_annotations != NULL) {
2301 classfile_parse_error(
2302 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2303 }
2304 runtime_visible_annotations_length = method_attribute_length;
2305 runtime_visible_annotations = cfs->get_u1_buffer();
2306 assert(runtime_visible_annotations != NULL, "null visible annotations");
2307 parse_annotations(runtime_visible_annotations,
2308 runtime_visible_annotations_length, &parsed_annotations);
2309 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2310 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2311 if (runtime_invisible_annotations_exists) {
2312 classfile_parse_error(
2313 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2314 }
2315 runtime_invisible_annotations_exists = true;
2316 if (PreserveAllAnnotations) {
2317 runtime_invisible_annotations_length = method_attribute_length;
2318 runtime_invisible_annotations = cfs->get_u1_buffer();
2319 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2320 }
2321 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2322 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2323 if (runtime_visible_parameter_annotations != NULL) {
2324 classfile_parse_error(
2325 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2326 }
2327 runtime_visible_parameter_annotations_length = method_attribute_length;
2328 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2329 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2330 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2331 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2332 if (runtime_invisible_parameter_annotations_exists) {
2333 classfile_parse_error(
2334 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2335 }
2336 runtime_invisible_parameter_annotations_exists = true;
2337 if (PreserveAllAnnotations) {
2338 runtime_invisible_parameter_annotations_length = method_attribute_length;
2339 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2340 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2341 }
2342 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2343 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2344 if (annotation_default != NULL) {
2345 classfile_parse_error(
2346 "Multiple AnnotationDefault attributes for method in class file %s",
2347 CHECK_(nullHandle));
2348 }
2349 annotation_default_length = method_attribute_length;
2350 annotation_default = cfs->get_u1_buffer();
2351 assert(annotation_default != NULL, "null annotation default");
2352 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2353 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2354 if (runtime_visible_type_annotations != NULL) {
2355 classfile_parse_error(
2356 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2357 CHECK_(nullHandle));
2358 }
2359 runtime_visible_type_annotations_length = method_attribute_length;
2360 runtime_visible_type_annotations = cfs->get_u1_buffer();
2361 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2362 // No need for the VM to parse Type annotations
2363 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2364 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2365 if (runtime_invisible_type_annotations_exists) {
2366 classfile_parse_error(
2367 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2368 CHECK_(nullHandle));
2369 } else {
2370 runtime_invisible_type_annotations_exists = true;
2371 }
2372 if (PreserveAllAnnotations) {
2373 runtime_invisible_type_annotations_length = method_attribute_length;
2374 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2375 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2376 }
2377 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2378 } else {
2379 // Skip unknown attributes
2380 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2381 }
2382 } else {
2383 // Skip unknown attributes
2384 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2385 }
2386 }
2387
2388 if (linenumber_table != NULL) {
2389 linenumber_table->write_terminator();
2390 linenumber_table_length = linenumber_table->position();
2391 }
2392
2393 // Make sure there's at least one Code attribute in non-native/non-abstract method
2394 if (_need_verify) {
2395 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2396 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2397 }
2398
2399 // All sizing information for a Method* is finally available, now create it
2400 InlineTableSizes sizes(
2401 total_lvt_length,
2402 linenumber_table_length,
2403 exception_table_length,
2404 checked_exceptions_length,
2405 method_parameters_length,
2406 generic_signature_index,
2407 runtime_visible_annotations_length +
2408 runtime_invisible_annotations_length,
2409 runtime_visible_parameter_annotations_length +
2410 runtime_invisible_parameter_annotations_length,
2411 runtime_visible_type_annotations_length +
2412 runtime_invisible_type_annotations_length,
2413 annotation_default_length,
2414 0);
2415
2416 Method* m = Method::allocate(
2417 _loader_data, code_length, access_flags, &sizes,
2418 ConstMethod::NORMAL, CHECK_(nullHandle));
2419
2420 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2421
2422 // Fill in information from fixed part (access_flags already set)
2423 m->set_constants(_cp);
2424 m->set_name_index(name_index);
2425 m->set_signature_index(signature_index);
2426 #ifdef CC_INTERP
2427 // hmm is there a gc issue here??
2428 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2429 m->set_result_index(rtf.type());
2430 #endif
2431
2432 if (args_size >= 0) {
2433 m->set_size_of_parameters(args_size);
2434 } else {
2435 m->compute_size_of_parameters(THREAD);
2436 }
2437 #ifdef ASSERT
2438 if (args_size >= 0) {
2439 m->compute_size_of_parameters(THREAD);
2440 assert(args_size == m->size_of_parameters(), "");
2441 }
2442 #endif
2443
2444 // Fill in code attribute information
2445 m->set_max_stack(max_stack);
2446 m->set_max_locals(max_locals);
2447 if (stackmap_data != NULL) {
2448 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2449 stackmap_data_length, CHECK_NULL);
2450 }
2451
2452 // Copy byte codes
2453 m->set_code(code_start);
2454
2455 // Copy line number table
2456 if (linenumber_table != NULL) {
2457 memcpy(m->compressed_linenumber_table(),
2458 linenumber_table->buffer(), linenumber_table_length);
2459 }
2460
2461 // Copy exception table
2462 if (exception_table_length > 0) {
2463 int size =
2464 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2465 copy_u2_with_conversion((u2*) m->exception_table_start(),
2466 exception_table_start, size);
2467 }
2468
2469 // Copy method parameters
2470 if (method_parameters_length > 0) {
2471 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2472 for (int i = 0; i < method_parameters_length; i++) {
2473 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2474 method_parameters_data += 2;
2475 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2476 method_parameters_data += 2;
2477 }
2478 }
2479
2480 // Copy checked exceptions
2481 if (checked_exceptions_length > 0) {
2482 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2483 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2484 }
2485
2486 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2487 if (total_lvt_length > 0) {
2488 promoted_flags->set_has_localvariable_table();
2489 copy_localvariable_table(m->constMethod(), lvt_cnt,
2490 localvariable_table_length,
2491 localvariable_table_start,
2492 lvtt_cnt,
2493 localvariable_type_table_length,
2494 localvariable_type_table_start, CHECK_NULL);
2495 }
2496
2497 if (parsed_annotations.has_any_annotations())
2498 parsed_annotations.apply_to(m);
2499
2500 // Copy annotations
2501 copy_method_annotations(m->constMethod(),
2502 runtime_visible_annotations,
2503 runtime_visible_annotations_length,
2504 runtime_invisible_annotations,
2505 runtime_invisible_annotations_length,
2506 runtime_visible_parameter_annotations,
2507 runtime_visible_parameter_annotations_length,
2508 runtime_invisible_parameter_annotations,
2509 runtime_invisible_parameter_annotations_length,
2510 runtime_visible_type_annotations,
2511 runtime_visible_type_annotations_length,
2512 runtime_invisible_type_annotations,
2513 runtime_invisible_type_annotations_length,
2514 annotation_default,
2515 annotation_default_length,
2516 CHECK_NULL);
2517
2518 if (name == vmSymbols::finalize_method_name() &&
2519 signature == vmSymbols::void_method_signature()) {
2520 if (m->is_empty_method()) {
2521 _has_empty_finalizer = true;
2522 } else {
2523 _has_finalizer = true;
2524 }
2525 }
2526 if (name == vmSymbols::object_initializer_name() &&
2527 signature == vmSymbols::void_method_signature() &&
2528 m->is_vanilla_constructor()) {
2529 _has_vanilla_constructor = true;
2530 }
2531
2532 NOT_PRODUCT(m->verify());
2533 return m;
2534 }
2535
2536
2537 // The promoted_flags parameter is used to pass relevant access_flags
2538 // from the methods back up to the containing klass. These flag values
2539 // are added to klass's access_flags.
2540
2541 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2542 AccessFlags* promoted_flags,
2543 bool* has_final_method,
2544 bool* declares_default_methods,
2545 TRAPS) {
2546 ClassFileStream* cfs = stream();
2547 cfs->guarantee_more(2, CHECK_NULL); // length
2548 u2 length = cfs->get_u2_fast();
2549 if (length == 0) {
2550 _methods = Universe::the_empty_method_array();
2551 } else {
2552 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2553
2554 HandleMark hm(THREAD);
2555 for (int index = 0; index < length; index++) {
2556 methodHandle method = parse_method(is_interface,
2557 promoted_flags,
2558 CHECK_NULL);
2559
2560 if (method->is_final()) {
2561 *has_final_method = true;
2562 }
2563 // declares_default_methods: declares concrete instance methods, any access flags
2564 // used for interface initialization, and default method inheritance analysis
2565 if (is_interface && !(*declares_default_methods)
2566 && !method->is_abstract() && !method->is_static()) {
2567 *declares_default_methods = true;
2568 }
2569 _methods->at_put(index, method());
2570 }
2571
2572 if (_need_verify && length > 1) {
2573 // Check duplicated methods
2574 ResourceMark rm(THREAD);
2575 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2576 THREAD, NameSigHash*, HASH_ROW_SIZE);
2577 initialize_hashtable(names_and_sigs);
2578 bool dup = false;
2579 {
2580 debug_only(No_Safepoint_Verifier nsv;)
2581 for (int i = 0; i < length; i++) {
2582 Method* m = _methods->at(i);
2583 // If no duplicates, add name/signature in hashtable names_and_sigs.
2584 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2585 dup = true;
2586 break;
2587 }
2588 }
2589 }
2590 if (dup) {
2591 classfile_parse_error("Duplicate method name&signature in class file %s",
2592 CHECK_NULL);
2593 }
2594 }
2595 }
2596 return _methods;
2597 }
2598
2599
2600 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2601 int length = methods->length();
2602 // If JVMTI original method ordering or sharing is enabled we have to
2603 // remember the original class file ordering.
2604 // We temporarily use the vtable_index field in the Method* to store the
2605 // class file index, so we can read in after calling qsort.
2606 // Put the method ordering in the shared archive.
2607 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2608 for (int index = 0; index < length; index++) {
2609 Method* m = methods->at(index);
2610 assert(!m->valid_vtable_index(), "vtable index should not be set");
2611 m->set_vtable_index(index);
2612 }
2613 }
2614 // Sort method array by ascending method name (for faster lookups & vtable construction)
2615 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2616 Method::sort_methods(methods);
2617
2618 intArray* method_ordering = NULL;
2619 // If JVMTI original method ordering or sharing is enabled construct int
2620 // array remembering the original ordering
2621 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2622 method_ordering = new intArray(length);
2623 for (int index = 0; index < length; index++) {
2624 Method* m = methods->at(index);
2625 int old_index = m->vtable_index();
2626 assert(old_index >= 0 && old_index < length, "invalid method index");
2627 method_ordering->at_put(index, old_index);
2628 m->set_vtable_index(Method::invalid_vtable_index);
2629 }
2630 }
2631 return method_ordering;
2632 }
2633
2634 // Parse generic_signature attribute for methods and fields
2635 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2636 ClassFileStream* cfs = stream();
2637 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2638 u2 generic_signature_index = cfs->get_u2_fast();
2639 check_property(
2640 valid_symbol_at(generic_signature_index),
2641 "Invalid Signature attribute at constant pool index %u in class file %s",
2642 generic_signature_index, CHECK_0);
2643 return generic_signature_index;
2644 }
2645
2646 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2647 ClassFileStream* cfs = stream();
2648 cfs->guarantee_more(2, CHECK); // sourcefile_index
2649 u2 sourcefile_index = cfs->get_u2_fast();
2650 check_property(
2651 valid_symbol_at(sourcefile_index),
2652 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2653 sourcefile_index, CHECK);
2654 set_class_sourcefile_index(sourcefile_index);
2655 }
2656
2657
2658
2659 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2660 ClassFileStream* cfs = stream();
2661 u1* sde_buffer = cfs->get_u1_buffer();
2662 assert(sde_buffer != NULL, "null sde buffer");
2663
2664 // Don't bother storing it if there is no way to retrieve it
2665 if (JvmtiExport::can_get_source_debug_extension()) {
2666 assert((length+1) > length, "Overflow checking");
2667 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2668 for (int i = 0; i < length; i++) {
2669 sde[i] = sde_buffer[i];
2670 }
2671 sde[length] = '\0';
2672 set_class_sde_buffer((char*)sde, length);
2673 }
2674 // Got utf8 string, set stream position forward
2675 cfs->skip_u1(length, CHECK);
2676 }
2677
2678
2679 // Inner classes can be static, private or protected (classic VM does this)
2680 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2681
2682 // Return number of classes in the inner classes attribute table
2683 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2684 bool parsed_enclosingmethod_attribute,
2685 u2 enclosing_method_class_index,
2686 u2 enclosing_method_method_index,
2687 TRAPS) {
2688 ClassFileStream* cfs = stream();
2689 u1* current_mark = cfs->current();
2690 u2 length = 0;
2691 if (inner_classes_attribute_start != NULL) {
2692 cfs->set_current(inner_classes_attribute_start);
2693 cfs->guarantee_more(2, CHECK_0); // length
2694 length = cfs->get_u2_fast();
2695 }
2696
2697 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2698 // method data:
2699 // [inner_class_info_index,
2700 // outer_class_info_index,
2701 // inner_name_index,
2702 // inner_class_access_flags,
2703 // ...
2704 // enclosing_method_class_index,
2705 // enclosing_method_method_index]
2706 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2707 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2708 _inner_classes = inner_classes;
2709
2710 int index = 0;
2711 int cp_size = _cp->length();
2712 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2713 for (int n = 0; n < length; n++) {
2714 // Inner class index
2715 u2 inner_class_info_index = cfs->get_u2_fast();
2716 check_property(
2717 valid_klass_reference_at(inner_class_info_index),
2718 "inner_class_info_index %u has bad constant type in class file %s",
2719 inner_class_info_index, CHECK_0);
2720 // Outer class index
2721 u2 outer_class_info_index = cfs->get_u2_fast();
2722 check_property(
2723 outer_class_info_index == 0 ||
2724 valid_klass_reference_at(outer_class_info_index),
2725 "outer_class_info_index %u has bad constant type in class file %s",
2726 outer_class_info_index, CHECK_0);
2727 // Inner class name
2728 u2 inner_name_index = cfs->get_u2_fast();
2729 check_property(
2730 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2731 "inner_name_index %u has bad constant type in class file %s",
2732 inner_name_index, CHECK_0);
2733 if (_need_verify) {
2734 guarantee_property(inner_class_info_index != outer_class_info_index,
2735 "Class is both outer and inner class in class file %s", CHECK_0);
2736 }
2737 // Access flags
2738 AccessFlags inner_access_flags;
2739 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2740 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2741 // Set abstract bit for old class files for backward compatibility
2742 flags |= JVM_ACC_ABSTRACT;
2743 }
2744 verify_legal_class_modifiers(flags, CHECK_0);
2745 inner_access_flags.set_flags(flags);
2746
2747 inner_classes->at_put(index++, inner_class_info_index);
2748 inner_classes->at_put(index++, outer_class_info_index);
2749 inner_classes->at_put(index++, inner_name_index);
2750 inner_classes->at_put(index++, inner_access_flags.as_short());
2751 }
2752
2753 // 4347400: make sure there's no duplicate entry in the classes array
2754 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2755 for(int i = 0; i < length * 4; i += 4) {
2756 for(int j = i + 4; j < length * 4; j += 4) {
2757 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2758 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2759 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2760 inner_classes->at(i+3) != inner_classes->at(j+3)),
2761 "Duplicate entry in InnerClasses in class file %s",
2762 CHECK_0);
2763 }
2764 }
2765 }
2766
2767 // Set EnclosingMethod class and method indexes.
2768 if (parsed_enclosingmethod_attribute) {
2769 inner_classes->at_put(index++, enclosing_method_class_index);
2770 inner_classes->at_put(index++, enclosing_method_method_index);
2771 }
2772 assert(index == size, "wrong size");
2773
2774 // Restore buffer's current position.
2775 cfs->set_current(current_mark);
2776
2777 return length;
2778 }
2779
2780 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2781 set_class_synthetic_flag(true);
2782 }
2783
2784 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2785 ClassFileStream* cfs = stream();
2786 u2 signature_index = cfs->get_u2(CHECK);
2787 check_property(
2788 valid_symbol_at(signature_index),
2789 "Invalid constant pool index %u in Signature attribute in class file %s",
2790 signature_index, CHECK);
2791 set_class_generic_signature_index(signature_index);
2792 }
2793
2794 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2795 ClassFileStream* cfs = stream();
2796 u1* current_start = cfs->current();
2797
2798 guarantee_property(attribute_byte_length >= sizeof(u2),
2799 "Invalid BootstrapMethods attribute length %u in class file %s",
2800 attribute_byte_length,
2801 CHECK);
2802
2803 cfs->guarantee_more(attribute_byte_length, CHECK);
2804
2805 int attribute_array_length = cfs->get_u2_fast();
2806
2807 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2808 "Short length on BootstrapMethods in class file %s",
2809 CHECK);
2810
2811
2812 // The attribute contains a counted array of counted tuples of shorts,
2813 // represending bootstrap specifiers:
2814 // length*{bootstrap_method_index, argument_count*{argument_index}}
2815 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2816 // operand_count = number of shorts in attr, except for leading length
2817
2818 // The attribute is copied into a short[] array.
2819 // The array begins with a series of short[2] pairs, one for each tuple.
2820 int index_size = (attribute_array_length * 2);
2821
2822 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2823
2824 // Eagerly assign operands so they will be deallocated with the constant
2825 // pool if there is an error.
2826 _cp->set_operands(operands);
2827
2828 int operand_fill_index = index_size;
2829 int cp_size = _cp->length();
2830
2831 for (int n = 0; n < attribute_array_length; n++) {
2832 // Store a 32-bit offset into the header of the operand array.
2833 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2834
2835 // Read a bootstrap specifier.
2836 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2837 u2 bootstrap_method_index = cfs->get_u2_fast();
2838 u2 argument_count = cfs->get_u2_fast();
2839 check_property(
2840 valid_cp_range(bootstrap_method_index, cp_size) &&
2841 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2842 "bootstrap_method_index %u has bad constant type in class file %s",
2843 bootstrap_method_index,
2844 CHECK);
2845
2846 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2847 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2848 CHECK);
2849
2850 operands->at_put(operand_fill_index++, bootstrap_method_index);
2851 operands->at_put(operand_fill_index++, argument_count);
2852
2853 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2854 for (int j = 0; j < argument_count; j++) {
2855 u2 argument_index = cfs->get_u2_fast();
2856 check_property(
2857 valid_cp_range(argument_index, cp_size) &&
2858 _cp->tag_at(argument_index).is_loadable_constant(),
2859 "argument_index %u has bad constant type in class file %s",
2860 argument_index,
2861 CHECK);
2862 operands->at_put(operand_fill_index++, argument_index);
2863 }
2864 }
2865
2866 u1* current_end = cfs->current();
2867 guarantee_property(current_end == current_start + attribute_byte_length,
2868 "Bad length on BootstrapMethods in class file %s",
2869 CHECK);
2870 }
2871
2872 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2873 TRAPS) {
2874 ClassFileStream* cfs = stream();
2875 // Set inner classes attribute to default sentinel
2876 _inner_classes = Universe::the_empty_short_array();
2877 cfs->guarantee_more(2, CHECK); // attributes_count
2878 u2 attributes_count = cfs->get_u2_fast();
2879 bool parsed_sourcefile_attribute = false;
2880 bool parsed_innerclasses_attribute = false;
2881 bool parsed_enclosingmethod_attribute = false;
2882 bool parsed_bootstrap_methods_attribute = false;
2883 u1* runtime_visible_annotations = NULL;
2884 int runtime_visible_annotations_length = 0;
2885 u1* runtime_invisible_annotations = NULL;
2886 int runtime_invisible_annotations_length = 0;
2887 u1* runtime_visible_type_annotations = NULL;
2888 int runtime_visible_type_annotations_length = 0;
2889 u1* runtime_invisible_type_annotations = NULL;
2890 int runtime_invisible_type_annotations_length = 0;
2891 bool runtime_invisible_type_annotations_exists = false;
2892 bool runtime_invisible_annotations_exists = false;
2893 bool parsed_source_debug_ext_annotations_exist = false;
2894 u1* inner_classes_attribute_start = NULL;
2895 u4 inner_classes_attribute_length = 0;
2896 u2 enclosing_method_class_index = 0;
2897 u2 enclosing_method_method_index = 0;
2898 // Iterate over attributes
2899 while (attributes_count--) {
2900 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2901 u2 attribute_name_index = cfs->get_u2_fast();
2902 u4 attribute_length = cfs->get_u4_fast();
2903 check_property(
2904 valid_symbol_at(attribute_name_index),
2905 "Attribute name has bad constant pool index %u in class file %s",
2906 attribute_name_index, CHECK);
2907 Symbol* tag = _cp->symbol_at(attribute_name_index);
2908 if (tag == vmSymbols::tag_source_file()) {
2909 // Check for SourceFile tag
2910 if (_need_verify) {
2911 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2912 }
2913 if (parsed_sourcefile_attribute) {
2914 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2915 } else {
2916 parsed_sourcefile_attribute = true;
2917 }
2918 parse_classfile_sourcefile_attribute(CHECK);
2919 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2920 // Check for SourceDebugExtension tag
2921 if (parsed_source_debug_ext_annotations_exist) {
2922 classfile_parse_error(
2923 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2924 }
2925 parsed_source_debug_ext_annotations_exist = true;
2926 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2927 } else if (tag == vmSymbols::tag_inner_classes()) {
2928 // Check for InnerClasses tag
2929 if (parsed_innerclasses_attribute) {
2930 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2931 } else {
2932 parsed_innerclasses_attribute = true;
2933 }
2934 inner_classes_attribute_start = cfs->get_u1_buffer();
2935 inner_classes_attribute_length = attribute_length;
2936 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2937 } else if (tag == vmSymbols::tag_synthetic()) {
2938 // Check for Synthetic tag
2939 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2940 if (attribute_length != 0) {
2941 classfile_parse_error(
2942 "Invalid Synthetic classfile attribute length %u in class file %s",
2943 attribute_length, CHECK);
2944 }
2945 parse_classfile_synthetic_attribute(CHECK);
2946 } else if (tag == vmSymbols::tag_deprecated()) {
2947 // Check for Deprecatd tag - 4276120
2948 if (attribute_length != 0) {
2949 classfile_parse_error(
2950 "Invalid Deprecated classfile attribute length %u in class file %s",
2951 attribute_length, CHECK);
2952 }
2953 } else if (_major_version >= JAVA_1_5_VERSION) {
2954 if (tag == vmSymbols::tag_signature()) {
2955 if (attribute_length != 2) {
2956 classfile_parse_error(
2957 "Wrong Signature attribute length %u in class file %s",
2958 attribute_length, CHECK);
2959 }
2960 parse_classfile_signature_attribute(CHECK);
2961 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2962 if (runtime_visible_annotations != NULL) {
2963 classfile_parse_error(
2964 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2965 }
2966 runtime_visible_annotations_length = attribute_length;
2967 runtime_visible_annotations = cfs->get_u1_buffer();
2968 assert(runtime_visible_annotations != NULL, "null visible annotations");
2969 parse_annotations(runtime_visible_annotations,
2970 runtime_visible_annotations_length,
2971 parsed_annotations);
2972 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2973 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2974 if (runtime_invisible_annotations_exists) {
2975 classfile_parse_error(
2976 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2977 }
2978 runtime_invisible_annotations_exists = true;
2979 if (PreserveAllAnnotations) {
2980 runtime_invisible_annotations_length = attribute_length;
2981 runtime_invisible_annotations = cfs->get_u1_buffer();
2982 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2983 }
2984 cfs->skip_u1(attribute_length, CHECK);
2985 } else if (tag == vmSymbols::tag_enclosing_method()) {
2986 if (parsed_enclosingmethod_attribute) {
2987 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2988 } else {
2989 parsed_enclosingmethod_attribute = true;
2990 }
2991 guarantee_property(attribute_length == 4,
2992 "Wrong EnclosingMethod attribute length %u in class file %s",
2993 attribute_length, CHECK);
2994 cfs->guarantee_more(4, CHECK); // class_index, method_index
2995 enclosing_method_class_index = cfs->get_u2_fast();
2996 enclosing_method_method_index = cfs->get_u2_fast();
2997 if (enclosing_method_class_index == 0) {
2998 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2999 }
3000 // Validate the constant pool indices and types
3001 check_property(valid_klass_reference_at(enclosing_method_class_index),
3002 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3003 if (enclosing_method_method_index != 0 &&
3004 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3005 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3006 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3007 }
3008 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3009 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3010 if (parsed_bootstrap_methods_attribute)
3011 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3012 parsed_bootstrap_methods_attribute = true;
3013 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3014 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3015 if (runtime_visible_type_annotations != NULL) {
3016 classfile_parse_error(
3017 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3018 }
3019 runtime_visible_type_annotations_length = attribute_length;
3020 runtime_visible_type_annotations = cfs->get_u1_buffer();
3021 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3022 // No need for the VM to parse Type annotations
3023 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3024 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3025 if (runtime_invisible_type_annotations_exists) {
3026 classfile_parse_error(
3027 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3028 } else {
3029 runtime_invisible_type_annotations_exists = true;
3030 }
3031 if (PreserveAllAnnotations) {
3032 runtime_invisible_type_annotations_length = attribute_length;
3033 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3034 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3035 }
3036 cfs->skip_u1(attribute_length, CHECK);
3037 } else {
3038 // Unknown attribute
3039 cfs->skip_u1(attribute_length, CHECK);
3040 }
3041 } else {
3042 // Unknown attribute
3043 cfs->skip_u1(attribute_length, CHECK);
3044 }
3045 }
3046 _annotations = assemble_annotations(runtime_visible_annotations,
3047 runtime_visible_annotations_length,
3048 runtime_invisible_annotations,
3049 runtime_invisible_annotations_length,
3050 CHECK);
3051 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3052 runtime_visible_type_annotations_length,
3053 runtime_invisible_type_annotations,
3054 runtime_invisible_type_annotations_length,
3055 CHECK);
3056
3057 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3058 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3059 inner_classes_attribute_start,
3060 parsed_innerclasses_attribute,
3061 enclosing_method_class_index,
3062 enclosing_method_method_index,
3063 CHECK);
3064 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3065 guarantee_property(
3066 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3067 "Wrong InnerClasses attribute length in class file %s", CHECK);
3068 }
3069 }
3070
3071 if (_max_bootstrap_specifier_index >= 0) {
3072 guarantee_property(parsed_bootstrap_methods_attribute,
3073 "Missing BootstrapMethods attribute in class file %s", CHECK);
3074 }
3075 }
3076
3077 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3078 if (_synthetic_flag)
3079 k->set_is_synthetic();
3080 if (_sourcefile_index != 0) {
3081 k->set_source_file_name_index(_sourcefile_index);
3082 }
3083 if (_generic_signature_index != 0) {
3084 k->set_generic_signature_index(_generic_signature_index);
3085 }
3086 if (_sde_buffer != NULL) {
3087 k->set_source_debug_extension(_sde_buffer, _sde_length);
3088 }
3089 }
3090
3091 // Create the Annotations object that will
3092 // hold the annotations array for the Klass.
3093 void ClassFileParser::create_combined_annotations(TRAPS) {
3094 if (_annotations == NULL &&
3095 _type_annotations == NULL &&
3096 _fields_annotations == NULL &&
3097 _fields_type_annotations == NULL) {
3098 // Don't create the Annotations object unnecessarily.
3099 return;
3100 }
3101
3102 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3103 annotations->set_class_annotations(_annotations);
3104 annotations->set_class_type_annotations(_type_annotations);
3105 annotations->set_fields_annotations(_fields_annotations);
3106 annotations->set_fields_type_annotations(_fields_type_annotations);
3107
3108 // This is the Annotations object that will be
3109 // assigned to InstanceKlass being constructed.
3110 _combined_annotations = annotations;
3111
3112 // The annotations arrays below has been transfered the
3113 // _combined_annotations so these fields can now be cleared.
3114 _annotations = NULL;
3115 _type_annotations = NULL;
3116 _fields_annotations = NULL;
3117 _fields_type_annotations = NULL;
3118 }
3119
3120 // Transfer ownership of metadata allocated to the InstanceKlass.
3121 void ClassFileParser::apply_parsed_class_metadata(
3122 instanceKlassHandle this_klass,
3123 int java_fields_count, TRAPS) {
3124 _cp->set_pool_holder(this_klass());
3125 this_klass->set_constants(_cp);
3126 this_klass->set_fields(_fields, java_fields_count);
3127 this_klass->set_methods(_methods);
3128 this_klass->set_inner_classes(_inner_classes);
3129 this_klass->set_local_interfaces(_local_interfaces);
3130 this_klass->set_transitive_interfaces(_transitive_interfaces);
3131 this_klass->set_annotations(_combined_annotations);
3132
3133 // Clear out these fields so they don't get deallocated by the destructor
3134 clear_class_metadata();
3135 }
3136
3137 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3138 int runtime_visible_annotations_length,
3139 u1* runtime_invisible_annotations,
3140 int runtime_invisible_annotations_length, TRAPS) {
3141 AnnotationArray* annotations = NULL;
3142 if (runtime_visible_annotations != NULL ||
3143 runtime_invisible_annotations != NULL) {
3144 annotations = MetadataFactory::new_array<u1>(_loader_data,
3145 runtime_visible_annotations_length +
3146 runtime_invisible_annotations_length,
3147 CHECK_(annotations));
3148 if (runtime_visible_annotations != NULL) {
3149 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3150 annotations->at_put(i, runtime_visible_annotations[i]);
3151 }
3152 }
3153 if (runtime_invisible_annotations != NULL) {
3154 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3155 int append = runtime_visible_annotations_length+i;
3156 annotations->at_put(append, runtime_invisible_annotations[i]);
3157 }
3158 }
3159 }
3160 return annotations;
3161 }
3162
3163 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3164 TRAPS) {
3165 instanceKlassHandle super_klass;
3166 if (super_class_index == 0) {
3167 check_property(_class_name == vmSymbols::java_lang_Object(),
3168 "Invalid superclass index %u in class file %s",
3169 super_class_index,
3170 CHECK_NULL);
3171 } else {
3172 check_property(valid_klass_reference_at(super_class_index),
3173 "Invalid superclass index %u in class file %s",
3174 super_class_index,
3175 CHECK_NULL);
3176 // The class name should be legal because it is checked when parsing constant pool.
3177 // However, make sure it is not an array type.
3178 bool is_array = false;
3179 if (_cp->tag_at(super_class_index).is_klass()) {
3180 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3181 if (_need_verify) {
3182 is_array = super_klass->is_array_klass();
3183 }
3184 } else if (_need_verify) {
3185 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3186 }
3187 if (_need_verify) {
3188 guarantee_property(!is_array,
3189 "Bad superclass name in class file %s", CHECK_NULL);
3190 }
3191 }
3192 return super_klass;
3193 }
3194
3195
3196 // Values needed for oopmap and InstanceKlass creation
3197 class FieldLayoutInfo : public StackObj {
3198 public:
3199 int* nonstatic_oop_offsets;
3200 unsigned int* nonstatic_oop_counts;
3201 unsigned int nonstatic_oop_map_count;
3202 unsigned int total_oop_map_count;
3203 int instance_size;
3204 int nonstatic_field_size;
3205 int static_field_size;
3206 bool has_nonstatic_fields;
3207 };
3208
3209 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3210 void ClassFileParser::layout_fields(Handle class_loader,
3211 FieldAllocationCount* fac,
3212 ClassAnnotationCollector* parsed_annotations,
3213 FieldLayoutInfo* info,
3214 TRAPS) {
3215
3216 // Field size and offset computation
3217 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3218 int next_static_oop_offset = 0;
3219 int next_static_double_offset = 0;
3220 int next_static_word_offset = 0;
3221 int next_static_short_offset = 0;
3222 int next_static_byte_offset = 0;
3223 int next_nonstatic_oop_offset = 0;
3224 int next_nonstatic_double_offset = 0;
3225 int next_nonstatic_word_offset = 0;
3226 int next_nonstatic_short_offset = 0;
3227 int next_nonstatic_byte_offset = 0;
3228 int first_nonstatic_oop_offset = 0;
3229 int next_nonstatic_field_offset = 0;
3230 int next_nonstatic_padded_offset = 0;
3231
3232 // Count the contended fields by type.
3233 //
3234 // We ignore static fields, because @Contended is not supported for them.
3235 // The layout code below will also ignore the static fields.
3236 int nonstatic_contended_count = 0;
3237 FieldAllocationCount fac_contended;
3238 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3239 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3240 if (fs.is_contended()) {
3241 fac_contended.count[atype]++;
3242 if (!fs.access_flags().is_static()) {
3243 nonstatic_contended_count++;
3244 }
3245 }
3246 }
3247
3248
3249 // Calculate the starting byte offsets
3250 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3251 next_static_double_offset = next_static_oop_offset +
3252 ((fac->count[STATIC_OOP]) * heapOopSize);
3253 if ( fac->count[STATIC_DOUBLE] &&
3254 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3255 Universe::field_type_should_be_aligned(T_LONG)) ) {
3256 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3257 }
3258
3259 next_static_word_offset = next_static_double_offset +
3260 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3261 next_static_short_offset = next_static_word_offset +
3262 ((fac->count[STATIC_WORD]) * BytesPerInt);
3263 next_static_byte_offset = next_static_short_offset +
3264 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3265
3266 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3267 nonstatic_field_size * heapOopSize;
3268
3269 next_nonstatic_field_offset = nonstatic_fields_start;
3270
3271 bool is_contended_class = parsed_annotations->is_contended();
3272
3273 // Class is contended, pad before all the fields
3274 if (is_contended_class) {
3275 next_nonstatic_field_offset += ContendedPaddingWidth;
3276 }
3277
3278 // Compute the non-contended fields count.
3279 // The packing code below relies on these counts to determine if some field
3280 // can be squeezed into the alignment gap. Contended fields are obviously
3281 // exempt from that.
3282 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3283 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3284 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3285 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3286 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3287
3288 // Total non-static fields count, including every contended field
3289 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3290 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3291 fac->count[NONSTATIC_OOP];
3292
3293 bool super_has_nonstatic_fields =
3294 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3295 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3296
3297
3298 // Prepare list of oops for oop map generation.
3299 //
3300 // "offset" and "count" lists are describing the set of contiguous oop
3301 // regions. offset[i] is the start of the i-th region, which then has
3302 // count[i] oops following. Before we know how many regions are required,
3303 // we pessimistically allocate the maps to fit all the oops into the
3304 // distinct regions.
3305 //
3306 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3307 // to figure out if we still need to do this.
3308 int* nonstatic_oop_offsets;
3309 unsigned int* nonstatic_oop_counts;
3310 unsigned int nonstatic_oop_map_count = 0;
3311 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3312
3313 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3314 THREAD, int, max_nonstatic_oop_maps);
3315 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3316 THREAD, unsigned int, max_nonstatic_oop_maps);
3317
3318 first_nonstatic_oop_offset = 0; // will be set for first oop field
3319
3320 bool compact_fields = CompactFields;
3321 int allocation_style = FieldsAllocationStyle;
3322 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3323 assert(false, "0 <= FieldsAllocationStyle <= 2");
3324 allocation_style = 1; // Optimistic
3325 }
3326
3327 // The next classes have predefined hard-coded fields offsets
3328 // (see in JavaClasses::compute_hard_coded_offsets()).
3329 // Use default fields allocation order for them.
3330 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3331 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3332 _class_name == vmSymbols::java_lang_Class() ||
3333 _class_name == vmSymbols::java_lang_ClassLoader() ||
3334 _class_name == vmSymbols::java_lang_ref_Reference() ||
3335 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3336 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3337 _class_name == vmSymbols::java_lang_String() ||
3338 _class_name == vmSymbols::java_lang_Throwable() ||
3339 _class_name == vmSymbols::java_lang_Boolean() ||
3340 _class_name == vmSymbols::java_lang_Character() ||
3341 _class_name == vmSymbols::java_lang_Float() ||
3342 _class_name == vmSymbols::java_lang_Double() ||
3343 _class_name == vmSymbols::java_lang_Byte() ||
3344 _class_name == vmSymbols::java_lang_Short() ||
3345 _class_name == vmSymbols::java_lang_Integer() ||
3346 _class_name == vmSymbols::java_lang_Long())) {
3347 allocation_style = 0; // Allocate oops first
3348 compact_fields = false; // Don't compact fields
3349 }
3350
3351 // Rearrange fields for a given allocation style
3352 if( allocation_style == 0 ) {
3353 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3354 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3355 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3356 (nonstatic_oop_count * heapOopSize);
3357 } else if( allocation_style == 1 ) {
3358 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3359 next_nonstatic_double_offset = next_nonstatic_field_offset;
3360 } else if( allocation_style == 2 ) {
3361 // Fields allocation: oops fields in super and sub classes are together.
3362 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3363 _super_klass->nonstatic_oop_map_size() > 0 ) {
3364 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3365 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3366 OopMapBlock* last_map = first_map + map_count - 1;
3367 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3368 if (next_offset == next_nonstatic_field_offset) {
3369 allocation_style = 0; // allocate oops first
3370 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3371 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3372 (nonstatic_oop_count * heapOopSize);
3373 }
3374 }
3375 if( allocation_style == 2 ) {
3376 allocation_style = 1; // allocate oops last
3377 next_nonstatic_double_offset = next_nonstatic_field_offset;
3378 }
3379 } else {
3380 ShouldNotReachHere();
3381 }
3382
3383 int nonstatic_oop_space_count = 0;
3384 int nonstatic_word_space_count = 0;
3385 int nonstatic_short_space_count = 0;
3386 int nonstatic_byte_space_count = 0;
3387 int nonstatic_oop_space_offset = 0;
3388 int nonstatic_word_space_offset = 0;
3389 int nonstatic_short_space_offset = 0;
3390 int nonstatic_byte_space_offset = 0;
3391
3392 // Try to squeeze some of the fields into the gaps due to
3393 // long/double alignment.
3394 if( nonstatic_double_count > 0 ) {
3395 int offset = next_nonstatic_double_offset;
3396 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3397 if( compact_fields && offset != next_nonstatic_double_offset ) {
3398 // Allocate available fields into the gap before double field.
3399 int length = next_nonstatic_double_offset - offset;
3400 assert(length == BytesPerInt, "");
3401 nonstatic_word_space_offset = offset;
3402 if( nonstatic_word_count > 0 ) {
3403 nonstatic_word_count -= 1;
3404 nonstatic_word_space_count = 1; // Only one will fit
3405 length -= BytesPerInt;
3406 offset += BytesPerInt;
3407 }
3408 nonstatic_short_space_offset = offset;
3409 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3410 nonstatic_short_count -= 1;
3411 nonstatic_short_space_count += 1;
3412 length -= BytesPerShort;
3413 offset += BytesPerShort;
3414 }
3415 nonstatic_byte_space_offset = offset;
3416 while( length > 0 && nonstatic_byte_count > 0 ) {
3417 nonstatic_byte_count -= 1;
3418 nonstatic_byte_space_count += 1;
3419 length -= 1;
3420 }
3421 // Allocate oop field in the gap if there are no other fields for that.
3422 nonstatic_oop_space_offset = offset;
3423 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3424 allocation_style != 0 ) { // when oop fields not first
3425 nonstatic_oop_count -= 1;
3426 nonstatic_oop_space_count = 1; // Only one will fit
3427 length -= heapOopSize;
3428 offset += heapOopSize;
3429 }
3430 }
3431 }
3432
3433 next_nonstatic_word_offset = next_nonstatic_double_offset +
3434 (nonstatic_double_count * BytesPerLong);
3435 next_nonstatic_short_offset = next_nonstatic_word_offset +
3436 (nonstatic_word_count * BytesPerInt);
3437 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3438 (nonstatic_short_count * BytesPerShort);
3439 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3440 nonstatic_byte_count;
3441
3442 // let oops jump before padding with this allocation style
3443 if( allocation_style == 1 ) {
3444 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3445 if( nonstatic_oop_count > 0 ) {
3446 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3447 }
3448 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3449 }
3450
3451 // Iterate over fields again and compute correct offsets.
3452 // The field allocation type was temporarily stored in the offset slot.
3453 // oop fields are located before non-oop fields (static and non-static).
3454 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3455
3456 // skip already laid out fields
3457 if (fs.is_offset_set()) continue;
3458
3459 // contended instance fields are handled below
3460 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3461
3462 int real_offset = 0;
3463 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3464
3465 // pack the rest of the fields
3466 switch (atype) {
3467 case STATIC_OOP:
3468 real_offset = next_static_oop_offset;
3469 next_static_oop_offset += heapOopSize;
3470 break;
3471 case STATIC_BYTE:
3472 real_offset = next_static_byte_offset;
3473 next_static_byte_offset += 1;
3474 break;
3475 case STATIC_SHORT:
3476 real_offset = next_static_short_offset;
3477 next_static_short_offset += BytesPerShort;
3478 break;
3479 case STATIC_WORD:
3480 real_offset = next_static_word_offset;
3481 next_static_word_offset += BytesPerInt;
3482 break;
3483 case STATIC_DOUBLE:
3484 real_offset = next_static_double_offset;
3485 next_static_double_offset += BytesPerLong;
3486 break;
3487 case NONSTATIC_OOP:
3488 if( nonstatic_oop_space_count > 0 ) {
3489 real_offset = nonstatic_oop_space_offset;
3490 nonstatic_oop_space_offset += heapOopSize;
3491 nonstatic_oop_space_count -= 1;
3492 } else {
3493 real_offset = next_nonstatic_oop_offset;
3494 next_nonstatic_oop_offset += heapOopSize;
3495 }
3496
3497 // Record this oop in the oop maps
3498 if( nonstatic_oop_map_count > 0 &&
3499 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3500 real_offset -
3501 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3502 heapOopSize ) {
3503 // This oop is adjacent to the previous one, add to current oop map
3504 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3505 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3506 } else {
3507 // This oop is not adjacent to the previous one, create new oop map
3508 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3509 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3510 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3511 nonstatic_oop_map_count += 1;
3512 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3513 first_nonstatic_oop_offset = real_offset;
3514 }
3515 }
3516 break;
3517 case NONSTATIC_BYTE:
3518 if( nonstatic_byte_space_count > 0 ) {
3519 real_offset = nonstatic_byte_space_offset;
3520 nonstatic_byte_space_offset += 1;
3521 nonstatic_byte_space_count -= 1;
3522 } else {
3523 real_offset = next_nonstatic_byte_offset;
3524 next_nonstatic_byte_offset += 1;
3525 }
3526 break;
3527 case NONSTATIC_SHORT:
3528 if( nonstatic_short_space_count > 0 ) {
3529 real_offset = nonstatic_short_space_offset;
3530 nonstatic_short_space_offset += BytesPerShort;
3531 nonstatic_short_space_count -= 1;
3532 } else {
3533 real_offset = next_nonstatic_short_offset;
3534 next_nonstatic_short_offset += BytesPerShort;
3535 }
3536 break;
3537 case NONSTATIC_WORD:
3538 if( nonstatic_word_space_count > 0 ) {
3539 real_offset = nonstatic_word_space_offset;
3540 nonstatic_word_space_offset += BytesPerInt;
3541 nonstatic_word_space_count -= 1;
3542 } else {
3543 real_offset = next_nonstatic_word_offset;
3544 next_nonstatic_word_offset += BytesPerInt;
3545 }
3546 break;
3547 case NONSTATIC_DOUBLE:
3548 real_offset = next_nonstatic_double_offset;
3549 next_nonstatic_double_offset += BytesPerLong;
3550 break;
3551 default:
3552 ShouldNotReachHere();
3553 }
3554 fs.set_offset(real_offset);
3555 }
3556
3557
3558 // Handle the contended cases.
3559 //
3560 // Each contended field should not intersect the cache line with another contended field.
3561 // In the absence of alignment information, we end up with pessimistically separating
3562 // the fields with full-width padding.
3563 //
3564 // Additionally, this should not break alignment for the fields, so we round the alignment up
3565 // for each field.
3566 if (nonstatic_contended_count > 0) {
3567
3568 // if there is at least one contended field, we need to have pre-padding for them
3569 next_nonstatic_padded_offset += ContendedPaddingWidth;
3570
3571 // collect all contended groups
3572 BitMap bm(_cp->size());
3573 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3574 // skip already laid out fields
3575 if (fs.is_offset_set()) continue;
3576
3577 if (fs.is_contended()) {
3578 bm.set_bit(fs.contended_group());
3579 }
3580 }
3581
3582 int current_group = -1;
3583 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3584
3585 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3586
3587 // skip already laid out fields
3588 if (fs.is_offset_set()) continue;
3589
3590 // skip non-contended fields and fields from different group
3591 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3592
3593 // handle statics below
3594 if (fs.access_flags().is_static()) continue;
3595
3596 int real_offset = 0;
3597 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3598
3599 switch (atype) {
3600 case NONSTATIC_BYTE:
3601 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3602 real_offset = next_nonstatic_padded_offset;
3603 next_nonstatic_padded_offset += 1;
3604 break;
3605
3606 case NONSTATIC_SHORT:
3607 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3608 real_offset = next_nonstatic_padded_offset;
3609 next_nonstatic_padded_offset += BytesPerShort;
3610 break;
3611
3612 case NONSTATIC_WORD:
3613 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3614 real_offset = next_nonstatic_padded_offset;
3615 next_nonstatic_padded_offset += BytesPerInt;
3616 break;
3617
3618 case NONSTATIC_DOUBLE:
3619 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3620 real_offset = next_nonstatic_padded_offset;
3621 next_nonstatic_padded_offset += BytesPerLong;
3622 break;
3623
3624 case NONSTATIC_OOP:
3625 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3626 real_offset = next_nonstatic_padded_offset;
3627 next_nonstatic_padded_offset += heapOopSize;
3628
3629 // Record this oop in the oop maps
3630 if( nonstatic_oop_map_count > 0 &&
3631 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3632 real_offset -
3633 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3634 heapOopSize ) {
3635 // This oop is adjacent to the previous one, add to current oop map
3636 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3637 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3638 } else {
3639 // This oop is not adjacent to the previous one, create new oop map
3640 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3641 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3642 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3643 nonstatic_oop_map_count += 1;
3644 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3645 first_nonstatic_oop_offset = real_offset;
3646 }
3647 }
3648 break;
3649
3650 default:
3651 ShouldNotReachHere();
3652 }
3653
3654 if (fs.contended_group() == 0) {
3655 // Contended group defines the equivalence class over the fields:
3656 // the fields within the same contended group are not inter-padded.
3657 // The only exception is default group, which does not incur the
3658 // equivalence, and so requires intra-padding.
3659 next_nonstatic_padded_offset += ContendedPaddingWidth;
3660 }
3661
3662 fs.set_offset(real_offset);
3663 } // for
3664
3665 // Start laying out the next group.
3666 // Note that this will effectively pad the last group in the back;
3667 // this is expected to alleviate memory contention effects for
3668 // subclass fields and/or adjacent object.
3669 // If this was the default group, the padding is already in place.
3670 if (current_group != 0) {
3671 next_nonstatic_padded_offset += ContendedPaddingWidth;
3672 }
3673 }
3674
3675 // handle static fields
3676 }
3677
3678 // Entire class is contended, pad in the back.
3679 // This helps to alleviate memory contention effects for subclass fields
3680 // and/or adjacent object.
3681 if (is_contended_class) {
3682 next_nonstatic_padded_offset += ContendedPaddingWidth;
3683 }
3684
3685 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3686
3687 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3688 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3689 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3690
3691 int static_field_size = (static_fields_end -
3692 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3693 nonstatic_field_size = nonstatic_field_size +
3694 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3695
3696 int instance_size = align_object_size(instance_end / wordSize);
3697
3698 assert(instance_size == align_object_size(align_size_up(
3699 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3700 wordSize) / wordSize), "consistent layout helper value");
3701
3702 // Invariant: nonstatic_field end/start should only change if there are
3703 // nonstatic fields in the class, or if the class is contended. We compare
3704 // against the non-aligned value, so that end alignment will not fail the
3705 // assert without actually having the fields.
3706 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3707 is_contended_class ||
3708 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3709
3710 // Number of non-static oop map blocks allocated at end of klass.
3711 const unsigned int total_oop_map_count =
3712 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3713 first_nonstatic_oop_offset);
3714
3715 #ifndef PRODUCT
3716 if (PrintFieldLayout) {
3717 print_field_layout(_class_name,
3718 _fields,
3719 _cp,
3720 instance_size,
3721 nonstatic_fields_start,
3722 nonstatic_fields_end,
3723 static_fields_end);
3724 }
3725
3726 #endif
3727 // Pass back information needed for InstanceKlass creation
3728 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3729 info->nonstatic_oop_counts = nonstatic_oop_counts;
3730 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3731 info->total_oop_map_count = total_oop_map_count;
3732 info->instance_size = instance_size;
3733 info->static_field_size = static_field_size;
3734 info->nonstatic_field_size = nonstatic_field_size;
3735 info->has_nonstatic_fields = has_nonstatic_fields;
3736 }
3737
3738
3739 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3740 ClassLoaderData* loader_data,
3741 Handle protection_domain,
3742 KlassHandle host_klass,
3743 GrowableArray<Handle>* cp_patches,
3744 TempNewSymbol& parsed_name,
3745 bool verify,
3746 TRAPS) {
3747
3748 // When a retransformable agent is attached, JVMTI caches the
3749 // class bytes that existed before the first retransformation.
3750 // If RedefineClasses() was used before the retransformable
3751 // agent attached, then the cached class bytes may not be the
3752 // original class bytes.
3753 JvmtiCachedClassFileData *cached_class_file = NULL;
3754 Handle class_loader(THREAD, loader_data->class_loader());
3755 bool has_default_methods = false;
3756 bool declares_default_methods = false;
3757 ResourceMark rm(THREAD);
3758
3759 ClassFileStream* cfs = stream();
3760 // Timing
3761 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3762 JavaThread* jt = (JavaThread*) THREAD;
3763
3764 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3765 ClassLoader::perf_class_parse_selftime(),
3766 NULL,
3767 jt->get_thread_stat()->perf_recursion_counts_addr(),
3768 jt->get_thread_stat()->perf_timers_addr(),
3769 PerfClassTraceTime::PARSE_CLASS);
3770
3771 init_parsed_class_attributes(loader_data);
3772
3773 if (JvmtiExport::should_post_class_file_load_hook()) {
3774 // Get the cached class file bytes (if any) from the class that
3775 // is being redefined or retransformed. We use jvmti_thread_state()
3776 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3777 // a JvmtiThreadState any earlier than necessary. This will help
3778 // avoid the bug described by 7126851.
3779 JvmtiThreadState *state = jt->jvmti_thread_state();
3780 if (state != NULL) {
3781 KlassHandle *h_class_being_redefined =
3782 state->get_class_being_redefined();
3783 if (h_class_being_redefined != NULL) {
3784 instanceKlassHandle ikh_class_being_redefined =
3785 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3786 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3787 }
3788 }
3789
3790 unsigned char* ptr = cfs->buffer();
3791 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3792
3793 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3794 &ptr, &end_ptr, &cached_class_file);
3795
3796 if (ptr != cfs->buffer()) {
3797 // JVMTI agent has modified class file data.
3798 // Set new class file stream using JVMTI agent modified
3799 // class file data.
3800 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3801 set_stream(cfs);
3802 }
3803 }
3804
3805 _host_klass = host_klass;
3806 _cp_patches = cp_patches;
3807
3808 instanceKlassHandle nullHandle;
3809
3810 // Figure out whether we can skip format checking (matching classic VM behavior)
3811 if (DumpSharedSpaces) {
3812 // verify == true means it's a 'remote' class (i.e., non-boot class)
3813 // Verification decision is based on BytecodeVerificationRemote flag
3814 // for those classes.
3815 _need_verify = (verify) ? BytecodeVerificationRemote :
3816 BytecodeVerificationLocal;
3817 } else {
3818 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3819 }
3820
3821 // Set the verify flag in stream
3822 cfs->set_verify(_need_verify);
3823
3824 // Save the class file name for easier error message printing.
3825 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3826
3827 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3828 // Magic value
3829 u4 magic = cfs->get_u4_fast();
3830 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3831 "Incompatible magic value %u in class file %s",
3832 magic, CHECK_(nullHandle));
3833
3834 // Version numbers
3835 u2 minor_version = cfs->get_u2_fast();
3836 u2 major_version = cfs->get_u2_fast();
3837
3838 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3839 ResourceMark rm;
3840 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3841 major_version, minor_version, name->as_C_string());
3842 Exceptions::fthrow(
3843 THREAD_AND_LOCATION,
3844 vmSymbols::java_lang_UnsupportedClassVersionError(),
3845 "Unsupported major.minor version for dump time %u.%u",
3846 major_version,
3847 minor_version);
3848 }
3849
3850 // Check version numbers - we check this even with verifier off
3851 if (!is_supported_version(major_version, minor_version)) {
3852 if (name == NULL) {
3853 Exceptions::fthrow(
3854 THREAD_AND_LOCATION,
3855 vmSymbols::java_lang_UnsupportedClassVersionError(),
3856 "Unsupported class file version %u.%u, "
3857 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3858 major_version,
3859 minor_version,
3860 JAVA_MAX_SUPPORTED_VERSION,
3861 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3862 } else {
3863 ResourceMark rm(THREAD);
3864 Exceptions::fthrow(
3865 THREAD_AND_LOCATION,
3866 vmSymbols::java_lang_UnsupportedClassVersionError(),
3867 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3868 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3869 name->as_C_string(),
3870 major_version,
3871 minor_version,
3872 JAVA_MAX_SUPPORTED_VERSION,
3873 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3874 }
3875 return nullHandle;
3876 }
3877
3878 _major_version = major_version;
3879 _minor_version = minor_version;
3880
3881
3882 // Check if verification needs to be relaxed for this class file
3883 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3884 _relax_verify = Verifier::relax_verify_for(class_loader());
3885
3886 // Constant pool
3887 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3888
3889 int cp_size = cp->length();
3890
3891 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3892
3893 // Access flags
3894 AccessFlags access_flags;
3895 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3896
3897 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3898 // Set abstract bit for old class files for backward compatibility
3899 flags |= JVM_ACC_ABSTRACT;
3900 }
3901 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3902 access_flags.set_flags(flags);
3903
3904 // This class and superclass
3905 u2 this_class_index = cfs->get_u2_fast();
3906 check_property(
3907 valid_cp_range(this_class_index, cp_size) &&
3908 cp->tag_at(this_class_index).is_unresolved_klass(),
3909 "Invalid this class index %u in constant pool in class file %s",
3910 this_class_index, CHECK_(nullHandle));
3911
3912 Symbol* class_name = cp->klass_name_at(this_class_index);
3913 assert(class_name != NULL, "class_name can't be null");
3914
3915 // It's important to set parsed_name *before* resolving the super class.
3916 // (it's used for cleanup by the caller if parsing fails)
3917 parsed_name = class_name;
3918 // parsed_name is returned and can be used if there's an error, so add to
3919 // its reference count. Caller will decrement the refcount.
3920 parsed_name->increment_refcount();
3921
3922 // Update _class_name which could be null previously to be class_name
3923 _class_name = class_name;
3924
3925 // Don't need to check whether this class name is legal or not.
3926 // It has been checked when constant pool is parsed.
3927 // However, make sure it is not an array type.
3928 if (_need_verify) {
3929 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3930 "Bad class name in class file %s",
3931 CHECK_(nullHandle));
3932 }
3933
3934 Klass* preserve_this_klass; // for storing result across HandleMark
3935
3936 // release all handles when parsing is done
3937 { HandleMark hm(THREAD);
3938
3939 // Checks if name in class file matches requested name
3940 if (name != NULL && class_name != name) {
3941 ResourceMark rm(THREAD);
3942 Exceptions::fthrow(
3943 THREAD_AND_LOCATION,
3944 vmSymbols::java_lang_NoClassDefFoundError(),
3945 "%s (wrong name: %s)",
3946 name->as_C_string(),
3947 class_name->as_C_string()
3948 );
3949 return nullHandle;
3950 }
3951
3952 if (TraceClassLoadingPreorder) {
3953 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3954 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3955 tty->print_cr("]");
3956 }
3957 #if INCLUDE_CDS
3958 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3959 // Only dump the classes that can be stored into CDS archive
3960 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3961 if (name != NULL) {
3962 ResourceMark rm(THREAD);
3963 classlist_file->print_cr("%s", name->as_C_string());
3964 classlist_file->flush();
3965 }
3966 }
3967 }
3968 #endif
3969
3970 u2 super_class_index = cfs->get_u2_fast();
3971 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3972 CHECK_NULL);
3973
3974 // Interfaces
3975 u2 itfs_len = cfs->get_u2_fast();
3976 Array<Klass*>* local_interfaces =
3977 parse_interfaces(itfs_len, protection_domain, _class_name,
3978 &has_default_methods, CHECK_(nullHandle));
3979
3980 u2 java_fields_count = 0;
3981 // Fields (offsets are filled in later)
3982 FieldAllocationCount fac;
3983 Array<u2>* fields = parse_fields(class_name,
3984 access_flags.is_interface(),
3985 &fac, &java_fields_count,
3986 CHECK_(nullHandle));
3987 // Methods
3988 bool has_final_method = false;
3989 AccessFlags promoted_flags;
3990 promoted_flags.set_flags(0);
3991 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3992 &promoted_flags,
3993 &has_final_method,
3994 &declares_default_methods,
3995 CHECK_(nullHandle));
3996
3997 if (declares_default_methods) {
3998 has_default_methods = true;
3999 }
4000
4001 // Additional attributes
4002 ClassAnnotationCollector parsed_annotations;
4003 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
4004
4005 // Finalize the Annotations metadata object,
4006 // now that all annotation arrays have been created.
4007 create_combined_annotations(CHECK_(nullHandle));
4008
4009 // Make sure this is the end of class file stream
4010 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
4011
4012 // We check super class after class file is parsed and format is checked
4013 if (super_class_index > 0 && super_klass.is_null()) {
4014 Symbol* sk = cp->klass_name_at(super_class_index);
4015 if (access_flags.is_interface()) {
4016 // Before attempting to resolve the superclass, check for class format
4017 // errors not checked yet.
4018 guarantee_property(sk == vmSymbols::java_lang_Object(),
4019 "Interfaces must have java.lang.Object as superclass in class file %s",
4020 CHECK_(nullHandle));
4021 }
4022 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4023 class_loader,
4024 protection_domain,
4025 true,
4026 CHECK_(nullHandle));
4027
4028 KlassHandle kh (THREAD, k);
4029 super_klass = instanceKlassHandle(THREAD, kh());
4030 }
4031 if (super_klass.not_null()) {
4032
4033 if (super_klass->has_default_methods()) {
4034 has_default_methods = true;
4035 }
4036
4037 if (super_klass->is_interface()) {
4038 ResourceMark rm(THREAD);
4039 Exceptions::fthrow(
4040 THREAD_AND_LOCATION,
4041 vmSymbols::java_lang_IncompatibleClassChangeError(),
4042 "class %s has interface %s as super class",
4043 class_name->as_klass_external_name(),
4044 super_klass->external_name()
4045 );
4046 return nullHandle;
4047 }
4048 // Make sure super class is not final
4049 if (super_klass->is_final()) {
4050 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4051 }
4052 }
4053
4054 // save super klass for error handling.
4055 _super_klass = super_klass;
4056
4057 // Compute the transitive list of all unique interfaces implemented by this class
4058 _transitive_interfaces =
4059 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4060
4061 // sort methods
4062 intArray* method_ordering = sort_methods(methods);
4063
4064 // promote flags from parse_methods() to the klass' flags
4065 access_flags.add_promoted_flags(promoted_flags.as_int());
4066
4067 // Size of Java vtable (in words)
4068 int vtable_size = 0;
4069 int itable_size = 0;
4070 int num_miranda_methods = 0;
4071
4072 GrowableArray<Method*> all_mirandas(20);
4073
4074 klassVtable::compute_vtable_size_and_num_mirandas(
4075 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4076 access_flags, class_loader, class_name, local_interfaces,
4077 CHECK_(nullHandle));
4078
4079 // Size of Java itable (in words)
4080 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4081
4082 FieldLayoutInfo info;
4083 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4084
4085 int total_oop_map_size2 =
4086 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4087
4088 // Compute reference type
4089 ReferenceType rt;
4090 if (super_klass() == NULL) {
4091 rt = REF_NONE;
4092 } else {
4093 rt = super_klass->reference_type();
4094 }
4095
4096 // We can now create the basic Klass* for this klass
4097 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4098 vtable_size,
4099 itable_size,
4100 info.static_field_size,
4101 total_oop_map_size2,
4102 rt,
4103 access_flags,
4104 name,
4105 super_klass(),
4106 !host_klass.is_null(),
4107 CHECK_(nullHandle));
4108 instanceKlassHandle this_klass (THREAD, _klass);
4109
4110 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4111 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4112 "sanity");
4113
4114 // Fill in information already parsed
4115 this_klass->set_should_verify_class(verify);
4116 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4117 this_klass->set_layout_helper(lh);
4118 assert(this_klass->is_instance_klass(), "layout is correct");
4119 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4120 // Not yet: supers are done below to support the new subtype-checking fields
4121 //this_klass->set_super(super_klass());
4122 this_klass->set_class_loader_data(loader_data);
4123 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4124 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4125 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4126
4127 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4128
4129 if (has_final_method) {
4130 this_klass->set_has_final_method();
4131 }
4132 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4133 // The InstanceKlass::_methods_jmethod_ids cache
4134 // is managed on the assumption that the initial cache
4135 // size is equal to the number of methods in the class. If
4136 // that changes, then InstanceKlass::idnum_can_increment()
4137 // has to be changed accordingly.
4138 this_klass->set_initial_method_idnum(methods->length());
4139 this_klass->set_name(cp->klass_name_at(this_class_index));
4140 if (is_anonymous()) // I am well known to myself
4141 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4142
4143 this_klass->set_minor_version(minor_version);
4144 this_klass->set_major_version(major_version);
4145 this_klass->set_has_default_methods(has_default_methods);
4146 this_klass->set_declares_default_methods(declares_default_methods);
4147
4148 if (!host_klass.is_null()) {
4149 assert (this_klass->is_anonymous(), "should be the same");
4150 this_klass->set_host_klass(host_klass());
4151 }
4152
4153 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4154 // (We used to do this lazily, but now we query it in Rewriter,
4155 // which is eagerly done for every method, so we might as well do it now,
4156 // when everything is fresh in memory.)
4157 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4158 if (klass_id != vmSymbols::NO_SID) {
4159 for (int j = 0; j < methods->length(); j++) {
4160 Method* method = methods->at(j);
4161 method->init_intrinsic_id();
4162
4163 if (CheckIntrinsics) {
4164 // Check if an intrinsic is defined for method 'method',
4165 // but the method is not annotated with @HotSpotIntrinsicCandidate.
4166 if (method->intrinsic_id() != vmIntrinsics::_none &&
4167 !method->intrinsic_candidate()) {
4168 tty->print("Compiler intrinsic is defined for method [%s], "
4169 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4170 method->name_and_sig_as_C_string(),
4171 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4172 );
4173 tty->cr();
4174 DEBUG_ONLY(vm_exit(1));
4175 }
4176 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4177 // but there is no intrinsic available for it.
4178 if (method->intrinsic_candidate() &&
4179 method->intrinsic_id() == vmIntrinsics::_none) {
4180 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4181 "but no compiler intrinsic is defined for the method.%s",
4182 method->name_and_sig_as_C_string(),
4183 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4184 );
4185 tty->cr();
4186 DEBUG_ONLY(vm_exit(1));
4187 }
4188 }
4189 }
4190
4191 #ifdef ASSERT
4192 if (CheckIntrinsics) {
4193 // Check for orphan methods in the current class. A method m
4194 // of a class C is orphan if an intrinsic is defined for method m,
4195 // but class C does not declare m.
4196 // The check is potentially expensive, therefore it is available
4197 // only in debug builds.
4198
4199 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4200 if (id == vmIntrinsics::_compiledLambdaForm) {
4201 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4202 // generated for the JVM from a LambdaForm and therefore no method
4203 // is defined for it.
4204 continue;
4205 }
4206
4207 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4208 // Check if the current class contains a method with the same
4209 // name, flags, signature.
4210 bool match = false;
4211 for (int j = 0; j < methods->length(); j++) {
4212 Method* method = methods->at(j);
4213 if (id == method->intrinsic_id()) {
4214 match = true;
4215 break;
4216 }
4217 }
4218
4219 if (!match) {
4220 char buf[1000];
4221 tty->print("Compiler intrinsic is defined for method [%s], "
4222 "but the method is not available in class [%s].%s",
4223 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4224 this_klass->name()->as_C_string(),
4225 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4226 );
4227 tty->cr();
4228 DEBUG_ONLY(vm_exit(1));
4229 }
4230 }
4231 }
4232 }
4233 #endif // ASSERT
4234 }
4235
4236
4237 if (cached_class_file != NULL) {
4238 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4239 this_klass->set_cached_class_file(cached_class_file);
4240 }
4241
4242 // Fill in field values obtained by parse_classfile_attributes
4243 if (parsed_annotations.has_any_annotations())
4244 parsed_annotations.apply_to(this_klass);
4245 apply_parsed_class_attributes(this_klass);
4246
4247 // Miranda methods
4248 if ((num_miranda_methods > 0) ||
4249 // if this class introduced new miranda methods or
4250 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4251 // super class exists and this class inherited miranda methods
4252 ) {
4253 this_klass->set_has_miranda_methods(); // then set a flag
4254 }
4255
4256 // Fill in information needed to compute superclasses.
4257 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4258
4259 // Initialize itable offset tables
4260 klassItable::setup_itable_offset_table(this_klass);
4261
4262 // Compute transitive closure of interfaces this class implements
4263 // Do final class setup
4264 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4265
4266 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4267 set_precomputed_flags(this_klass);
4268
4269 // reinitialize modifiers, using the InnerClasses attribute
4270 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4271 this_klass->set_modifier_flags(computed_modifiers);
4272
4273 // check if this class can access its super class
4274 check_super_class_access(this_klass, CHECK_(nullHandle));
4275
4276 // check if this class can access its superinterfaces
4277 check_super_interface_access(this_klass, CHECK_(nullHandle));
4278
4279 // check if this class overrides any final method
4280 check_final_method_override(this_klass, CHECK_(nullHandle));
4281
4282 // check that if this class is an interface then it doesn't have static methods
4283 if (this_klass->is_interface()) {
4284 /* An interface in a JAVA 8 classfile can be static */
4285 if (_major_version < JAVA_8_VERSION) {
4286 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4287 }
4288 }
4289
4290 // Allocate mirror and initialize static fields
4291 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4292 CHECK_(nullHandle));
4293
4294 // Generate any default methods - default methods are interface methods
4295 // that have a default implementation. This is new with Lambda project.
4296 if (has_default_methods ) {
4297 DefaultMethods::generate_default_methods(
4298 this_klass(), &all_mirandas, CHECK_(nullHandle));
4299 }
4300
4301 // Update the loader_data graph.
4302 record_defined_class_dependencies(this_klass, CHECK_NULL);
4303
4304 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4305 false /* not shared class */);
4306
4307 if (TraceClassLoading) {
4308 ResourceMark rm;
4309 // print in a single call to reduce interleaving of output
4310 if (cfs->source() != NULL) {
4311 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4312 cfs->source());
4313 } else if (class_loader.is_null()) {
4314 Klass* caller =
4315 THREAD->is_Java_thread()
4316 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4317 : NULL;
4318 // caller can be NULL, for example, during a JVMTI VM_Init hook
4319 if (caller != NULL) {
4320 tty->print("[Loaded %s by instance of %s]\n",
4321 this_klass->external_name(),
4322 caller->external_name());
4323 } else {
4324 tty->print("[Loaded %s]\n", this_klass->external_name());
4325 }
4326 } else {
4327 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4328 class_loader->klass()->external_name());
4329 }
4330 }
4331
4332 if (log_is_enabled(Debug, classload)) {
4333 this_klass()->print_loading_log(LogLevel::Debug, loader_data, cfs);
4334 }
4335 if (log_is_enabled(Trace, classload)) {
4336 this_klass()->print_loading_log(LogLevel::Trace, loader_data, cfs);
4337 }
4338
4339 if (TraceClassResolution) {
4340 ResourceMark rm;
4341 // print out the superclass.
4342 const char * from = this_klass()->external_name();
4343 if (this_klass->java_super() != NULL) {
4344 tty->print("RESOLVE %s %s (super)\n", from, this_klass->java_super()->external_name());
4345 }
4346 // print out each of the interface classes referred to by this class.
4347 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4348 if (local_interfaces != NULL) {
4349 int length = local_interfaces->length();
4350 for (int i = 0; i < length; i++) {
4351 Klass* k = local_interfaces->at(i);
4352 const char * to = k->external_name();
4353 tty->print("RESOLVE %s %s (interface)\n", from, to);
4354 }
4355 }
4356 }
4357
4358 // preserve result across HandleMark
4359 preserve_this_klass = this_klass();
4360 }
4361
4362 // Create new handle outside HandleMark (might be needed for
4363 // Extended Class Redefinition)
4364 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4365 debug_only(this_klass->verify();)
4366
4367 // Clear class if no error has occurred so destructor doesn't deallocate it
4368 _klass = NULL;
4369 return this_klass;
4370 }
4371
4372 // Destructor to clean up if there's an error
4373 ClassFileParser::~ClassFileParser() {
4374 MetadataFactory::free_metadata(_loader_data, _cp);
4375 MetadataFactory::free_array<u2>(_loader_data, _fields);
4376
4377 // Free methods
4378 InstanceKlass::deallocate_methods(_loader_data, _methods);
4379
4380 // beware of the Universe::empty_blah_array!!
4381 if (_inner_classes != Universe::the_empty_short_array()) {
4382 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4383 }
4384
4385 // Free interfaces
4386 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4387 _local_interfaces, _transitive_interfaces);
4388
4389 if (_combined_annotations != NULL) {
4390 // After all annotations arrays have been created, they are installed into the
4391 // Annotations object that will be assigned to the InstanceKlass being created.
4392
4393 // Deallocate the Annotations object and the installed annotations arrays.
4394 _combined_annotations->deallocate_contents(_loader_data);
4395
4396 // If the _combined_annotations pointer is non-NULL,
4397 // then the other annotations fields should have been cleared.
4398 assert(_annotations == NULL, "Should have been cleared");
4399 assert(_type_annotations == NULL, "Should have been cleared");
4400 assert(_fields_annotations == NULL, "Should have been cleared");
4401 assert(_fields_type_annotations == NULL, "Should have been cleared");
4402 } else {
4403 // If the annotations arrays were not installed into the Annotations object,
4404 // then they have to be deallocated explicitly.
4405 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4406 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4407 Annotations::free_contents(_loader_data, _fields_annotations);
4408 Annotations::free_contents(_loader_data, _fields_type_annotations);
4409 }
4410
4411 clear_class_metadata();
4412
4413 // deallocate the klass if already created. Don't directly deallocate, but add
4414 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4415 // at a safepoint.
4416 if (_klass != NULL) {
4417 _loader_data->add_to_deallocate_list(_klass);
4418 }
4419 _klass = NULL;
4420 }
4421
4422 void ClassFileParser::print_field_layout(Symbol* name,
4423 Array<u2>* fields,
4424 const constantPoolHandle& cp,
4425 int instance_size,
4426 int instance_fields_start,
4427 int instance_fields_end,
4428 int static_fields_end) {
4429 tty->print("%s: field layout\n", name->as_klass_external_name());
4430 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4431 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4432 if (!fs.access_flags().is_static()) {
4433 tty->print(" @%3d \"%s\" %s\n",
4434 fs.offset(),
4435 fs.name()->as_klass_external_name(),
4436 fs.signature()->as_klass_external_name());
4437 }
4438 }
4439 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4440 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4441 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4442 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4443 if (fs.access_flags().is_static()) {
4444 tty->print(" @%3d \"%s\" %s\n",
4445 fs.offset(),
4446 fs.name()->as_klass_external_name(),
4447 fs.signature()->as_klass_external_name());
4448 }
4449 }
4450 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4451 tty->print("\n");
4452 }
4453
4454 unsigned int
4455 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4456 unsigned int nonstatic_oop_map_count,
4457 int first_nonstatic_oop_offset) {
4458 unsigned int map_count =
4459 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4460 if (nonstatic_oop_map_count > 0) {
4461 // We have oops to add to map
4462 if (map_count == 0) {
4463 map_count = nonstatic_oop_map_count;
4464 } else {
4465 // Check whether we should add a new map block or whether the last one can
4466 // be extended
4467 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4468 OopMapBlock* const last_map = first_map + map_count - 1;
4469
4470 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4471 if (next_offset == first_nonstatic_oop_offset) {
4472 // There is no gap bettwen superklass's last oop field and first
4473 // local oop field, merge maps.
4474 nonstatic_oop_map_count -= 1;
4475 } else {
4476 // Superklass didn't end with a oop field, add extra maps
4477 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4478 }
4479 map_count += nonstatic_oop_map_count;
4480 }
4481 }
4482 return map_count;
4483 }
4484
4485
4486 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4487 unsigned int nonstatic_oop_map_count,
4488 int* nonstatic_oop_offsets,
4489 unsigned int* nonstatic_oop_counts) {
4490 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4491 const InstanceKlass* const super = k->superklass();
4492 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4493 if (super_count > 0) {
4494 // Copy maps from superklass
4495 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4496 for (unsigned int i = 0; i < super_count; ++i) {
4497 *this_oop_map++ = *super_oop_map++;
4498 }
4499 }
4500
4501 if (nonstatic_oop_map_count > 0) {
4502 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4503 // The counts differ because there is no gap between superklass's last oop
4504 // field and the first local oop field. Extend the last oop map copied
4505 // from the superklass instead of creating new one.
4506 nonstatic_oop_map_count--;
4507 nonstatic_oop_offsets++;
4508 this_oop_map--;
4509 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4510 this_oop_map++;
4511 }
4512
4513 // Add new map blocks, fill them
4514 while (nonstatic_oop_map_count-- > 0) {
4515 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4516 this_oop_map->set_count(*nonstatic_oop_counts++);
4517 this_oop_map++;
4518 }
4519 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4520 this_oop_map, "sanity");
4521 }
4522 }
4523
4524
4525 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4526 Klass* super = k->super();
4527
4528 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4529 // in which case we don't have to register objects as finalizable
4530 if (!_has_empty_finalizer) {
4531 if (_has_finalizer ||
4532 (super != NULL && super->has_finalizer())) {
4533 k->set_has_finalizer();
4534 }
4535 }
4536
4537 #ifdef ASSERT
4538 bool f = false;
4539 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4540 vmSymbols::void_method_signature());
4541 if (m != NULL && !m->is_empty_method()) {
4542 f = true;
4543 }
4544
4545 // Spec doesn't prevent agent from redefinition of empty finalizer.
4546 // Despite the fact that it's generally bad idea and redefined finalizer
4547 // will not work as expected we shouldn't abort vm in this case
4548 if (!k->has_redefined_this_or_super()) {
4549 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4550 }
4551 #endif
4552
4553 // Check if this klass supports the java.lang.Cloneable interface
4554 if (SystemDictionary::Cloneable_klass_loaded()) {
4555 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4556 k->set_is_cloneable();
4557 }
4558 }
4559
4560 // Check if this klass has a vanilla default constructor
4561 if (super == NULL) {
4562 // java.lang.Object has empty default constructor
4563 k->set_has_vanilla_constructor();
4564 } else {
4565 if (super->has_vanilla_constructor() &&
4566 _has_vanilla_constructor) {
4567 k->set_has_vanilla_constructor();
4568 }
4569 #ifdef ASSERT
4570 bool v = false;
4571 if (super->has_vanilla_constructor()) {
4572 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4573 ), vmSymbols::void_method_signature());
4574 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4575 v = true;
4576 }
4577 }
4578 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4579 #endif
4580 }
4581
4582 // If it cannot be fast-path allocated, set a bit in the layout helper.
4583 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4584 assert(k->size_helper() > 0, "layout_helper is initialized");
4585 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4586 || k->is_abstract() || k->is_interface()
4587 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4588 || k->size_helper() >= FastAllocateSizeLimit) {
4589 // Forbid fast-path allocation.
4590 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4591 k->set_layout_helper(lh);
4592 }
4593 }
4594
4595 // Attach super classes and interface classes to class loader data
4596 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4597 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4598 if (defining_loader_data->is_the_null_class_loader_data()) {
4599 // Dependencies to null class loader data are implicit.
4600 return;
4601 } else {
4602 // add super class dependency
4603 Klass* super = defined_klass->super();
4604 if (super != NULL) {
4605 defining_loader_data->record_dependency(super, CHECK);
4606 }
4607
4608 // add super interface dependencies
4609 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4610 if (local_interfaces != NULL) {
4611 int length = local_interfaces->length();
4612 for (int i = 0; i < length; i++) {
4613 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4614 }
4615 }
4616 }
4617 }
4618
4619 // utility methods for appending an array with check for duplicates
4620
4621 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4622 // iterate over new interfaces
4623 for (int i = 0; i < ifs->length(); i++) {
4624 Klass* e = ifs->at(i);
4625 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4626 // add new interface
4627 result->append_if_missing(e);
4628 }
4629 }
4630
4631 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4632 instanceKlassHandle super,
4633 Array<Klass*>* local_ifs, TRAPS) {
4634 // Compute maximum size for transitive interfaces
4635 int max_transitive_size = 0;
4636 int super_size = 0;
4637 // Add superclass transitive interfaces size
4638 if (super.not_null()) {
4639 super_size = super->transitive_interfaces()->length();
4640 max_transitive_size += super_size;
4641 }
4642 // Add local interfaces' super interfaces
4643 int local_size = local_ifs->length();
4644 for (int i = 0; i < local_size; i++) {
4645 Klass* l = local_ifs->at(i);
4646 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4647 }
4648 // Finally add local interfaces
4649 max_transitive_size += local_size;
4650 // Construct array
4651 if (max_transitive_size == 0) {
4652 // no interfaces, use canonicalized array
4653 return Universe::the_empty_klass_array();
4654 } else if (max_transitive_size == super_size) {
4655 // no new local interfaces added, share superklass' transitive interface array
4656 return super->transitive_interfaces();
4657 } else if (max_transitive_size == local_size) {
4658 // only local interfaces added, share local interface array
4659 return local_ifs;
4660 } else {
4661 ResourceMark rm;
4662 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4663
4664 // Copy down from superclass
4665 if (super.not_null()) {
4666 append_interfaces(result, super->transitive_interfaces());
4667 }
4668
4669 // Copy down from local interfaces' superinterfaces
4670 for (int i = 0; i < local_ifs->length(); i++) {
4671 Klass* l = local_ifs->at(i);
4672 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4673 }
4674 // Finally add local interfaces
4675 append_interfaces(result, local_ifs);
4676
4677 // length will be less than the max_transitive_size if duplicates were removed
4678 int length = result->length();
4679 assert(length <= max_transitive_size, "just checking");
4680 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4681 for (int i = 0; i < length; i++) {
4682 Klass* e = result->at(i);
4683 assert(e != NULL, "just checking");
4684 new_result->at_put(i, e);
4685 }
4686 return new_result;
4687 }
4688 }
4689
4690 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4691 Klass* super = this_klass->super();
4692 if ((super != NULL) &&
4693 (!Reflection::verify_class_access(this_klass(), super, false))) {
4694 ResourceMark rm(THREAD);
4695 Exceptions::fthrow(
4696 THREAD_AND_LOCATION,
4697 vmSymbols::java_lang_IllegalAccessError(),
4698 "class %s cannot access its superclass %s",
4699 this_klass->external_name(),
4700 super->external_name()
4701 );
4702 return;
4703 }
4704 }
4705
4706
4707 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4708 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4709 int lng = local_interfaces->length();
4710 for (int i = lng - 1; i >= 0; i--) {
4711 Klass* k = local_interfaces->at(i);
4712 assert (k != NULL && k->is_interface(), "invalid interface");
4713 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4714 ResourceMark rm(THREAD);
4715 Exceptions::fthrow(
4716 THREAD_AND_LOCATION,
4717 vmSymbols::java_lang_IllegalAccessError(),
4718 "class %s cannot access its superinterface %s",
4719 this_klass->external_name(),
4720 k->external_name()
4721 );
4722 return;
4723 }
4724 }
4725 }
4726
4727
4728 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4729 Array<Method*>* methods = this_klass->methods();
4730 int num_methods = methods->length();
4731
4732 // go thru each method and check if it overrides a final method
4733 for (int index = 0; index < num_methods; index++) {
4734 Method* m = methods->at(index);
4735
4736 // skip private, static, and <init> methods
4737 if ((!m->is_private() && !m->is_static()) &&
4738 (m->name() != vmSymbols::object_initializer_name())) {
4739
4740 Symbol* name = m->name();
4741 Symbol* signature = m->signature();
4742 Klass* k = this_klass->super();
4743 Method* super_m = NULL;
4744 while (k != NULL) {
4745 // skip supers that don't have final methods.
4746 if (k->has_final_method()) {
4747 // lookup a matching method in the super class hierarchy
4748 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4749 if (super_m == NULL) {
4750 break; // didn't find any match; get out
4751 }
4752
4753 if (super_m->is_final() && !super_m->is_static() &&
4754 // matching method in super is final, and not static
4755 (Reflection::verify_field_access(this_klass(),
4756 super_m->method_holder(),
4757 super_m->method_holder(),
4758 super_m->access_flags(), false))
4759 // this class can access super final method and therefore override
4760 ) {
4761 ResourceMark rm(THREAD);
4762 Exceptions::fthrow(
4763 THREAD_AND_LOCATION,
4764 vmSymbols::java_lang_VerifyError(),
4765 "class %s overrides final method %s.%s%s",
4766 this_klass->external_name(),
4767 super_m->method_holder()->external_name(),
4768 name->as_C_string(),
4769 signature->as_C_string()
4770 );
4771 return;
4772 }
4773
4774 // continue to look from super_m's holder's super.
4775 k = super_m->method_holder()->super();
4776 continue;
4777 }
4778
4779 k = k->super();
4780 }
4781 }
4782 }
4783 }
4784
4785
4786 // assumes that this_klass is an interface
4787 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4788 assert(this_klass->is_interface(), "not an interface");
4789 Array<Method*>* methods = this_klass->methods();
4790 int num_methods = methods->length();
4791
4792 for (int index = 0; index < num_methods; index++) {
4793 Method* m = methods->at(index);
4794 // if m is static and not the init method, throw a verify error
4795 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4796 ResourceMark rm(THREAD);
4797 Exceptions::fthrow(
4798 THREAD_AND_LOCATION,
4799 vmSymbols::java_lang_VerifyError(),
4800 "Illegal static method %s in interface %s",
4801 m->name()->as_C_string(),
4802 this_klass->external_name()
4803 );
4804 return;
4805 }
4806 }
4807 }
4808
4809 // utility methods for format checking
4810
4811 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4812 if (!_need_verify) { return; }
4813
4814 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4815 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4816 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4817 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4818 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4819 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4820 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4821
4822 if ((is_abstract && is_final) ||
4823 (is_interface && !is_abstract) ||
4824 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4825 (!is_interface && major_gte_15 && is_annotation)) {
4826 ResourceMark rm(THREAD);
4827 Exceptions::fthrow(
4828 THREAD_AND_LOCATION,
4829 vmSymbols::java_lang_ClassFormatError(),
4830 "Illegal class modifiers in class %s: 0x%X",
4831 _class_name->as_C_string(), flags
4832 );
4833 return;
4834 }
4835 }
4836
4837 bool ClassFileParser::has_illegal_visibility(jint flags) {
4838 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4839 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4840 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4841
4842 return ((is_public && is_protected) ||
4843 (is_public && is_private) ||
4844 (is_protected && is_private));
4845 }
4846
4847 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4848 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4849 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4850 (major <= max_version) &&
4851 ((major != max_version) ||
4852 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4853 }
4854
4855 void ClassFileParser::verify_legal_field_modifiers(
4856 jint flags, bool is_interface, TRAPS) {
4857 if (!_need_verify) { return; }
4858
4859 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4860 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4861 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4862 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4863 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4864 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4865 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4866 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4867 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4868
4869 bool is_illegal = false;
4870
4871 if (is_interface) {
4872 if (!is_public || !is_static || !is_final || is_private ||
4873 is_protected || is_volatile || is_transient ||
4874 (major_gte_15 && is_enum)) {
4875 is_illegal = true;
4876 }
4877 } else { // not interface
4878 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4879 is_illegal = true;
4880 }
4881 }
4882
4883 if (is_illegal) {
4884 ResourceMark rm(THREAD);
4885 Exceptions::fthrow(
4886 THREAD_AND_LOCATION,
4887 vmSymbols::java_lang_ClassFormatError(),
4888 "Illegal field modifiers in class %s: 0x%X",
4889 _class_name->as_C_string(), flags);
4890 return;
4891 }
4892 }
4893
4894 void ClassFileParser::verify_legal_method_modifiers(
4895 jint flags, bool is_interface, Symbol* name, TRAPS) {
4896 if (!_need_verify) { return; }
4897
4898 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4899 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4900 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4901 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4902 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4903 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4904 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4905 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4906 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4907 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4908 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4909 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4910 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4911
4912 bool is_illegal = false;
4913
4914 if (is_interface) {
4915 if (major_gte_8) {
4916 // Class file version is JAVA_8_VERSION or later Methods of
4917 // interfaces may set any of the flags except ACC_PROTECTED,
4918 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4919 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4920 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4921 (is_native || is_protected || is_final || is_synchronized) ||
4922 // If a specific method of a class or interface has its
4923 // ACC_ABSTRACT flag set, it must not have any of its
4924 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4925 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4926 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4927 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4928 (is_abstract && (is_private || is_static || is_strict))) {
4929 is_illegal = true;
4930 }
4931 } else if (major_gte_15) {
4932 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4933 if (!is_public || is_static || is_final || is_synchronized ||
4934 is_native || !is_abstract || is_strict) {
4935 is_illegal = true;
4936 }
4937 } else {
4938 // Class file version is pre-JAVA_1_5_VERSION
4939 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4940 is_illegal = true;
4941 }
4942 }
4943 } else { // not interface
4944 if (has_illegal_visibility(flags)) {
4945 is_illegal = true;
4946 } else {
4947 if (is_initializer) {
4948 if (is_static || is_final || is_synchronized || is_native ||
4949 is_abstract || (major_gte_15 && is_bridge)) {
4950 is_illegal = true;
4951 }
4952 } else { // not initializer
4953 if (is_abstract) {
4954 if ((is_final || is_native || is_private || is_static ||
4955 (major_gte_15 && (is_synchronized || is_strict)))) {
4956 is_illegal = true;
4957 }
4958 }
4959 }
4960 }
4961 }
4962
4963 if (is_illegal) {
4964 ResourceMark rm(THREAD);
4965 Exceptions::fthrow(
4966 THREAD_AND_LOCATION,
4967 vmSymbols::java_lang_ClassFormatError(),
4968 "Method %s in class %s has illegal modifiers: 0x%X",
4969 name->as_C_string(), _class_name->as_C_string(), flags);
4970 return;
4971 }
4972 }
4973
4974 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4975 assert(_need_verify, "only called when _need_verify is true");
4976 int i = 0;
4977 int count = length >> 2;
4978 for (int k=0; k<count; k++) {
4979 unsigned char b0 = buffer[i];
4980 unsigned char b1 = buffer[i+1];
4981 unsigned char b2 = buffer[i+2];
4982 unsigned char b3 = buffer[i+3];
4983 // For an unsigned char v,
4984 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4985 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4986 unsigned char res = b0 | b0 - 1 |
4987 b1 | b1 - 1 |
4988 b2 | b2 - 1 |
4989 b3 | b3 - 1;
4990 if (res >= 128) break;
4991 i += 4;
4992 }
4993 for(; i < length; i++) {
4994 unsigned short c;
4995 // no embedded zeros
4996 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4997 if(buffer[i] < 128) {
4998 continue;
4999 }
5000 if ((i + 5) < length) { // see if it's legal supplementary character
5001 if (UTF8::is_supplementary_character(&buffer[i])) {
5002 c = UTF8::get_supplementary_character(&buffer[i]);
5003 i += 5;
5004 continue;
5005 }
5006 }
5007 switch (buffer[i] >> 4) {
5008 default: break;
5009 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
5010 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5011 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
5012 c = (buffer[i] & 0x1F) << 6;
5013 i++;
5014 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
5015 c += buffer[i] & 0x3F;
5016 if (_major_version <= 47 || c == 0 || c >= 0x80) {
5017 // for classes with major > 47, c must a null or a character in its shortest form
5018 break;
5019 }
5020 }
5021 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5022 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
5023 c = (buffer[i] & 0xF) << 12;
5024 i += 2;
5025 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5026 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5027 if (_major_version <= 47 || c >= 0x800) {
5028 // for classes with major > 47, c must be in its shortest form
5029 break;
5030 }
5031 }
5032 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5033 } // end of switch
5034 } // end of for
5035 }
5036
5037 // Checks if name is a legal class name.
5038 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5039 if (!_need_verify || _relax_verify) { return; }
5040
5041 char buf[fixed_buffer_size];
5042 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5043 unsigned int length = name->utf8_length();
5044 bool legal = false;
5045
5046 if (length > 0) {
5047 char* p;
5048 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5049 p = skip_over_field_signature(bytes, false, length, CHECK);
5050 legal = (p != NULL) && ((p - bytes) == (int)length);
5051 } else if (_major_version < JAVA_1_5_VERSION) {
5052 if (bytes[0] != '<') {
5053 p = skip_over_field_name(bytes, true, length);
5054 legal = (p != NULL) && ((p - bytes) == (int)length);
5055 }
5056 } else {
5057 // 4900761: relax the constraints based on JSR202 spec
5058 // Class names may be drawn from the entire Unicode character set.
5059 // Identifiers between '/' must be unqualified names.
5060 // The utf8 string has been verified when parsing cpool entries.
5061 legal = verify_unqualified_name(bytes, length, LegalClass);
5062 }
5063 }
5064 if (!legal) {
5065 ResourceMark rm(THREAD);
5066 Exceptions::fthrow(
5067 THREAD_AND_LOCATION,
5068 vmSymbols::java_lang_ClassFormatError(),
5069 "Illegal class name \"%s\" in class file %s", bytes,
5070 _class_name->as_C_string()
5071 );
5072 return;
5073 }
5074 }
5075
5076 // Checks if name is a legal field name.
5077 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5078 if (!_need_verify || _relax_verify) { return; }
5079
5080 char buf[fixed_buffer_size];
5081 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5082 unsigned int length = name->utf8_length();
5083 bool legal = false;
5084
5085 if (length > 0) {
5086 if (_major_version < JAVA_1_5_VERSION) {
5087 if (bytes[0] != '<') {
5088 char* p = skip_over_field_name(bytes, false, length);
5089 legal = (p != NULL) && ((p - bytes) == (int)length);
5090 }
5091 } else {
5092 // 4881221: relax the constraints based on JSR202 spec
5093 legal = verify_unqualified_name(bytes, length, LegalField);
5094 }
5095 }
5096
5097 if (!legal) {
5098 ResourceMark rm(THREAD);
5099 Exceptions::fthrow(
5100 THREAD_AND_LOCATION,
5101 vmSymbols::java_lang_ClassFormatError(),
5102 "Illegal field name \"%s\" in class %s", bytes,
5103 _class_name->as_C_string()
5104 );
5105 return;
5106 }
5107 }
5108
5109 // Checks if name is a legal method name.
5110 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5111 if (!_need_verify || _relax_verify) { return; }
5112
5113 assert(name != NULL, "method name is null");
5114 char buf[fixed_buffer_size];
5115 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5116 unsigned int length = name->utf8_length();
5117 bool legal = false;
5118
5119 if (length > 0) {
5120 if (bytes[0] == '<') {
5121 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5122 legal = true;
5123 }
5124 } else if (_major_version < JAVA_1_5_VERSION) {
5125 char* p;
5126 p = skip_over_field_name(bytes, false, length);
5127 legal = (p != NULL) && ((p - bytes) == (int)length);
5128 } else {
5129 // 4881221: relax the constraints based on JSR202 spec
5130 legal = verify_unqualified_name(bytes, length, LegalMethod);
5131 }
5132 }
5133
5134 if (!legal) {
5135 ResourceMark rm(THREAD);
5136 Exceptions::fthrow(
5137 THREAD_AND_LOCATION,
5138 vmSymbols::java_lang_ClassFormatError(),
5139 "Illegal method name \"%s\" in class %s", bytes,
5140 _class_name->as_C_string()
5141 );
5142 return;
5143 }
5144 }
5145
5146
5147 // Checks if signature is a legal field signature.
5148 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5149 if (!_need_verify) { return; }
5150
5151 char buf[fixed_buffer_size];
5152 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5153 unsigned int length = signature->utf8_length();
5154 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5155
5156 if (p == NULL || (p - bytes) != (int)length) {
5157 throwIllegalSignature("Field", name, signature, CHECK);
5158 }
5159 }
5160
5161 // Checks if signature is a legal method signature.
5162 // Returns number of parameters
5163 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5164 if (!_need_verify) {
5165 // make sure caller's args_size will be less than 0 even for non-static
5166 // method so it will be recomputed in compute_size_of_parameters().
5167 return -2;
5168 }
5169
5170 unsigned int args_size = 0;
5171 char buf[fixed_buffer_size];
5172 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5173 unsigned int length = signature->utf8_length();
5174 char* nextp;
5175
5176 // The first character must be a '('
5177 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5178 length--;
5179 // Skip over legal field signatures
5180 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5181 while ((length > 0) && (nextp != NULL)) {
5182 args_size++;
5183 if (p[0] == 'J' || p[0] == 'D') {
5184 args_size++;
5185 }
5186 length -= nextp - p;
5187 p = nextp;
5188 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5189 }
5190 // The first non-signature thing better be a ')'
5191 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5192 length--;
5193 if (name == vmSymbols::object_initializer_name()) {
5194 // All "<init>" methods must return void
5195 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5196 return args_size;
5197 }
5198 } else {
5199 // Now we better just have a return value
5200 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5201 if (nextp && ((int)length == (nextp - p))) {
5202 return args_size;
5203 }
5204 }
5205 }
5206 }
5207 // Report error
5208 throwIllegalSignature("Method", name, signature, CHECK_0);
5209 return 0;
5210 }
5211
5212
5213 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5214 // Method names also may not contain the characters '<' or '>', unless <init>
5215 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5216 // method. Because these names have been checked as special cases before
5217 // calling this method in verify_legal_method_name.
5218 bool ClassFileParser::verify_unqualified_name(
5219 char* name, unsigned int length, int type) {
5220 jchar ch;
5221
5222 for (char* p = name; p != name + length; ) {
5223 ch = *p;
5224 if (ch < 128) {
5225 p++;
5226 if (ch == '.' || ch == ';' || ch == '[' ) {
5227 return false; // do not permit '.', ';', or '['
5228 }
5229 if (type != LegalClass && ch == '/') {
5230 return false; // do not permit '/' unless it's class name
5231 }
5232 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5233 return false; // do not permit '<' or '>' in method names
5234 }
5235 } else {
5236 char* tmp_p = UTF8::next(p, &ch);
5237 p = tmp_p;
5238 }
5239 }
5240 return true;
5241 }
5242
5243
5244 // Take pointer to a string. Skip over the longest part of the string that could
5245 // be taken as a fieldname. Allow '/' if slash_ok is true.
5246 // Return a pointer to just past the fieldname.
5247 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5248 // being true, we saw consecutive slashes (meaning we were looking for a
5249 // qualified path but found something that was badly-formed).
5250 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5251 char* p;
5252 jchar ch;
5253 jboolean last_is_slash = false;
5254 jboolean not_first_ch = false;
5255
5256 for (p = name; p != name + length; not_first_ch = true) {
5257 char* old_p = p;
5258 ch = *p;
5259 if (ch < 128) {
5260 p++;
5261 // quick check for ascii
5262 if ((ch >= 'a' && ch <= 'z') ||
5263 (ch >= 'A' && ch <= 'Z') ||
5264 (ch == '_' || ch == '$') ||
5265 (not_first_ch && ch >= '0' && ch <= '9')) {
5266 last_is_slash = false;
5267 continue;
5268 }
5269 if (slash_ok && ch == '/') {
5270 if (last_is_slash) {
5271 return NULL; // Don't permit consecutive slashes
5272 }
5273 last_is_slash = true;
5274 continue;
5275 }
5276 } else {
5277 jint unicode_ch;
5278 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5279 p = tmp_p;
5280 last_is_slash = false;
5281 // Check if ch is Java identifier start or is Java identifier part
5282 // 4672820: call java.lang.Character methods directly without generating separate tables.
5283 EXCEPTION_MARK;
5284 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5285
5286 // return value
5287 JavaValue result(T_BOOLEAN);
5288 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5289 JavaCallArguments args;
5290 args.push_int(unicode_ch);
5291
5292 // public static boolean isJavaIdentifierStart(char ch);
5293 JavaCalls::call_static(&result,
5294 klass,
5295 vmSymbols::isJavaIdentifierStart_name(),
5296 vmSymbols::int_bool_signature(),
5297 &args,
5298 THREAD);
5299
5300 if (HAS_PENDING_EXCEPTION) {
5301 CLEAR_PENDING_EXCEPTION;
5302 return 0;
5303 }
5304 if (result.get_jboolean()) {
5305 continue;
5306 }
5307
5308 if (not_first_ch) {
5309 // public static boolean isJavaIdentifierPart(char ch);
5310 JavaCalls::call_static(&result,
5311 klass,
5312 vmSymbols::isJavaIdentifierPart_name(),
5313 vmSymbols::int_bool_signature(),
5314 &args,
5315 THREAD);
5316
5317 if (HAS_PENDING_EXCEPTION) {
5318 CLEAR_PENDING_EXCEPTION;
5319 return 0;
5320 }
5321
5322 if (result.get_jboolean()) {
5323 continue;
5324 }
5325 }
5326 }
5327 return (not_first_ch) ? old_p : NULL;
5328 }
5329 return (not_first_ch) ? p : NULL;
5330 }
5331
5332
5333 // Take pointer to a string. Skip over the longest part of the string that could
5334 // be taken as a field signature. Allow "void" if void_ok.
5335 // Return a pointer to just past the signature.
5336 // Return NULL if no legal signature is found.
5337 char* ClassFileParser::skip_over_field_signature(char* signature,
5338 bool void_ok,
5339 unsigned int length,
5340 TRAPS) {
5341 unsigned int array_dim = 0;
5342 while (length > 0) {
5343 switch (signature[0]) {
5344 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5345 case JVM_SIGNATURE_BOOLEAN:
5346 case JVM_SIGNATURE_BYTE:
5347 case JVM_SIGNATURE_CHAR:
5348 case JVM_SIGNATURE_SHORT:
5349 case JVM_SIGNATURE_INT:
5350 case JVM_SIGNATURE_FLOAT:
5351 case JVM_SIGNATURE_LONG:
5352 case JVM_SIGNATURE_DOUBLE:
5353 return signature + 1;
5354 case JVM_SIGNATURE_CLASS: {
5355 if (_major_version < JAVA_1_5_VERSION) {
5356 // Skip over the class name if one is there
5357 char* p = skip_over_field_name(signature + 1, true, --length);
5358
5359 // The next character better be a semicolon
5360 if (p && (p - signature) > 1 && p[0] == ';') {
5361 return p + 1;
5362 }
5363 } else {
5364 // 4900761: For class version > 48, any unicode is allowed in class name.
5365 length--;
5366 signature++;
5367 while (length > 0 && signature[0] != ';') {
5368 if (signature[0] == '.') {
5369 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5370 }
5371 length--;
5372 signature++;
5373 }
5374 if (signature[0] == ';') { return signature + 1; }
5375 }
5376
5377 return NULL;
5378 }
5379 case JVM_SIGNATURE_ARRAY:
5380 array_dim++;
5381 if (array_dim > 255) {
5382 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5383 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5384 }
5385 // The rest of what's there better be a legal signature
5386 signature++;
5387 length--;
5388 void_ok = false;
5389 break;
5390
5391 default:
5392 return NULL;
5393 }
5394 }
5395 return NULL;
5396 }