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 "memory/allocation.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/oopFactory.hpp"
40 #include "memory/referenceType.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/instanceMirrorKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/klassVtable.hpp"
49 #include "oops/method.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm.h"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/perfData.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/classLoadingService.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/array.hpp"
62 #include "utilities/exceptions.hpp"
63 #include "utilities/globalDefinitions.hpp"
64 #include "utilities/macros.hpp"
65 #include "utilities/ostream.hpp"
66 #include "utilities/resourceHash.hpp"
67 #if INCLUDE_CDS
68 #include "classfile/systemDictionaryShared.hpp"
69 #endif
70
71 // We generally try to create the oops directly when parsing, rather than
72 // allocating temporary data structures and copying the bytes twice. A
73 // temporary area is only needed when parsing utf8 entries in the constant
74 // pool and when parsing line number tables.
75
76 // We add assert in debug mode when class format is not checked.
77
78 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
79 #define JAVA_MIN_SUPPORTED_VERSION 45
80 #define JAVA_MAX_SUPPORTED_VERSION 52
81 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
82
83 // Used for two backward compatibility reasons:
84 // - to check for new additions to the class file format in JDK1.5
85 // - to check for bug fixes in the format checker in JDK1.5
86 #define JAVA_1_5_VERSION 49
87
88 // Used for backward compatibility reasons:
89 // - to check for javac bug fixes that happened after 1.5
90 // - also used as the max version when running in jdk6
91 #define JAVA_6_VERSION 50
92
93 // Used for backward compatibility reasons:
94 // - to check NameAndType_info signatures more aggressively
95 // - to disallow argument and require ACC_STATIC for <clinit> methods
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 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_(nullHandle));
2002 }
2003 } else {
2004 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2005 }
2006
2007 if (name == vmSymbols::object_initializer_name() && is_interface) {
2008 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle));
2009 }
2010
2011 int args_size = -1; // only used when _need_verify is true
2012 if (_need_verify) {
2013 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2014 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2015 if (args_size > MAX_ARGS_SIZE) {
2016 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2017 }
2018 }
2019
2020 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2021
2022 // Default values for code and exceptions attribute elements
2023 u2 max_stack = 0;
2024 u2 max_locals = 0;
2025 u4 code_length = 0;
2026 u1* code_start = 0;
2027 u2 exception_table_length = 0;
2028 u2* exception_table_start = NULL;
2029 Array<int>* exception_handlers = Universe::the_empty_int_array();
2030 u2 checked_exceptions_length = 0;
2031 u2* checked_exceptions_start = NULL;
2032 CompressedLineNumberWriteStream* linenumber_table = NULL;
2033 int linenumber_table_length = 0;
2034 int total_lvt_length = 0;
2035 u2 lvt_cnt = 0;
2036 u2 lvtt_cnt = 0;
2037 bool lvt_allocated = false;
2038 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2039 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2040 u2* localvariable_table_length = NULL;
2041 u2** localvariable_table_start = NULL;
2042 u2* localvariable_type_table_length = NULL;
2043 u2** localvariable_type_table_start = NULL;
2044 int method_parameters_length = -1;
2045 u1* method_parameters_data = NULL;
2046 bool method_parameters_seen = false;
2047 bool parsed_code_attribute = false;
2048 bool parsed_checked_exceptions_attribute = false;
2049 bool parsed_stackmap_attribute = false;
2050 // stackmap attribute - JDK1.5
2051 u1* stackmap_data = NULL;
2052 int stackmap_data_length = 0;
2053 u2 generic_signature_index = 0;
2054 MethodAnnotationCollector parsed_annotations;
2055 u1* runtime_visible_annotations = NULL;
2056 int runtime_visible_annotations_length = 0;
2057 u1* runtime_invisible_annotations = NULL;
2058 int runtime_invisible_annotations_length = 0;
2059 u1* runtime_visible_parameter_annotations = NULL;
2060 int runtime_visible_parameter_annotations_length = 0;
2061 u1* runtime_invisible_parameter_annotations = NULL;
2062 int runtime_invisible_parameter_annotations_length = 0;
2063 u1* runtime_visible_type_annotations = NULL;
2064 int runtime_visible_type_annotations_length = 0;
2065 u1* runtime_invisible_type_annotations = NULL;
2066 int runtime_invisible_type_annotations_length = 0;
2067 bool runtime_invisible_annotations_exists = false;
2068 bool runtime_invisible_type_annotations_exists = false;
2069 bool runtime_invisible_parameter_annotations_exists = false;
2070 u1* annotation_default = NULL;
2071 int annotation_default_length = 0;
2072
2073 // Parse code and exceptions attribute
2074 u2 method_attributes_count = cfs->get_u2_fast();
2075 while (method_attributes_count--) {
2076 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2077 u2 method_attribute_name_index = cfs->get_u2_fast();
2078 u4 method_attribute_length = cfs->get_u4_fast();
2079 check_property(
2080 valid_symbol_at(method_attribute_name_index),
2081 "Invalid method attribute name index %u in class file %s",
2082 method_attribute_name_index, CHECK_(nullHandle));
2083
2084 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2085 if (method_attribute_name == vmSymbols::tag_code()) {
2086 // Parse Code attribute
2087 if (_need_verify) {
2088 guarantee_property(
2089 !access_flags.is_native() && !access_flags.is_abstract(),
2090 "Code attribute in native or abstract methods in class file %s",
2091 CHECK_(nullHandle));
2092 }
2093 if (parsed_code_attribute) {
2094 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2095 }
2096 parsed_code_attribute = true;
2097
2098 // Stack size, locals size, and code size
2099 if (_major_version == 45 && _minor_version <= 2) {
2100 cfs->guarantee_more(4, CHECK_(nullHandle));
2101 max_stack = cfs->get_u1_fast();
2102 max_locals = cfs->get_u1_fast();
2103 code_length = cfs->get_u2_fast();
2104 } else {
2105 cfs->guarantee_more(8, CHECK_(nullHandle));
2106 max_stack = cfs->get_u2_fast();
2107 max_locals = cfs->get_u2_fast();
2108 code_length = cfs->get_u4_fast();
2109 }
2110 if (_need_verify) {
2111 guarantee_property(args_size <= max_locals,
2112 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2113 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2114 "Invalid method Code length %u in class file %s",
2115 code_length, CHECK_(nullHandle));
2116 }
2117 // Code pointer
2118 code_start = cfs->get_u1_buffer();
2119 assert(code_start != NULL, "null code start");
2120 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2121 cfs->skip_u1_fast(code_length);
2122
2123 // Exception handler table
2124 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2125 exception_table_length = cfs->get_u2_fast();
2126 if (exception_table_length > 0) {
2127 exception_table_start =
2128 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2129 }
2130
2131 // Parse additional attributes in code attribute
2132 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2133 u2 code_attributes_count = cfs->get_u2_fast();
2134
2135 unsigned int calculated_attribute_length = 0;
2136
2137 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2138 calculated_attribute_length =
2139 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2140 } else {
2141 // max_stack, locals and length are smaller in pre-version 45.2 classes
2142 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2143 }
2144 calculated_attribute_length +=
2145 code_length +
2146 sizeof(exception_table_length) +
2147 sizeof(code_attributes_count) +
2148 exception_table_length *
2149 ( sizeof(u2) + // start_pc
2150 sizeof(u2) + // end_pc
2151 sizeof(u2) + // handler_pc
2152 sizeof(u2) ); // catch_type_index
2153
2154 while (code_attributes_count--) {
2155 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2156 u2 code_attribute_name_index = cfs->get_u2_fast();
2157 u4 code_attribute_length = cfs->get_u4_fast();
2158 calculated_attribute_length += code_attribute_length +
2159 sizeof(code_attribute_name_index) +
2160 sizeof(code_attribute_length);
2161 check_property(valid_symbol_at(code_attribute_name_index),
2162 "Invalid code attribute name index %u in class file %s",
2163 code_attribute_name_index,
2164 CHECK_(nullHandle));
2165 if (LoadLineNumberTables &&
2166 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2167 // Parse and compress line number table
2168 parse_linenumber_table(code_attribute_length, code_length,
2169 &linenumber_table, CHECK_(nullHandle));
2170
2171 } else if (LoadLocalVariableTables &&
2172 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2173 // Parse local variable table
2174 if (!lvt_allocated) {
2175 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2176 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2177 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2178 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2179 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2180 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2181 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2182 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2183 lvt_allocated = true;
2184 }
2185 if (lvt_cnt == max_lvt_cnt) {
2186 max_lvt_cnt <<= 1;
2187 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2188 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2189 }
2190 localvariable_table_start[lvt_cnt] =
2191 parse_localvariable_table(code_length,
2192 max_locals,
2193 code_attribute_length,
2194 &localvariable_table_length[lvt_cnt],
2195 false, // is not LVTT
2196 CHECK_(nullHandle));
2197 total_lvt_length += localvariable_table_length[lvt_cnt];
2198 lvt_cnt++;
2199 } else if (LoadLocalVariableTypeTables &&
2200 _major_version >= JAVA_1_5_VERSION &&
2201 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2202 if (!lvt_allocated) {
2203 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2204 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2205 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2206 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2207 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2208 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2209 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2210 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2211 lvt_allocated = true;
2212 }
2213 // Parse local variable type table
2214 if (lvtt_cnt == max_lvtt_cnt) {
2215 max_lvtt_cnt <<= 1;
2216 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2217 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2218 }
2219 localvariable_type_table_start[lvtt_cnt] =
2220 parse_localvariable_table(code_length,
2221 max_locals,
2222 code_attribute_length,
2223 &localvariable_type_table_length[lvtt_cnt],
2224 true, // is LVTT
2225 CHECK_(nullHandle));
2226 lvtt_cnt++;
2227 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2228 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2229 // Stack map is only needed by the new verifier in JDK1.5.
2230 if (parsed_stackmap_attribute) {
2231 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2232 }
2233 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2234 stackmap_data_length = code_attribute_length;
2235 parsed_stackmap_attribute = true;
2236 } else {
2237 // Skip unknown attributes
2238 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2239 }
2240 }
2241 // check method attribute length
2242 if (_need_verify) {
2243 guarantee_property(method_attribute_length == calculated_attribute_length,
2244 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2245 }
2246 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2247 // Parse Exceptions attribute
2248 if (parsed_checked_exceptions_attribute) {
2249 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2250 }
2251 parsed_checked_exceptions_attribute = true;
2252 checked_exceptions_start =
2253 parse_checked_exceptions(&checked_exceptions_length,
2254 method_attribute_length,
2255 CHECK_(nullHandle));
2256 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2257 // reject multiple method parameters
2258 if (method_parameters_seen) {
2259 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2260 }
2261 method_parameters_seen = true;
2262 method_parameters_length = cfs->get_u1_fast();
2263 const u2 real_length = (method_parameters_length * 4u) + 1u;
2264 if (method_attribute_length != real_length) {
2265 classfile_parse_error(
2266 "Invalid MethodParameters method attribute length %u in class file",
2267 method_attribute_length, CHECK_(nullHandle));
2268 }
2269 method_parameters_data = cfs->get_u1_buffer();
2270 cfs->skip_u2_fast(method_parameters_length);
2271 cfs->skip_u2_fast(method_parameters_length);
2272 // ignore this attribute if it cannot be reflected
2273 if (!SystemDictionary::Parameter_klass_loaded())
2274 method_parameters_length = -1;
2275 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2276 if (method_attribute_length != 0) {
2277 classfile_parse_error(
2278 "Invalid Synthetic method attribute length %u in class file %s",
2279 method_attribute_length, CHECK_(nullHandle));
2280 }
2281 // Should we check that there hasn't already been a synthetic attribute?
2282 access_flags.set_is_synthetic();
2283 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2284 if (method_attribute_length != 0) {
2285 classfile_parse_error(
2286 "Invalid Deprecated method attribute length %u in class file %s",
2287 method_attribute_length, CHECK_(nullHandle));
2288 }
2289 } else if (_major_version >= JAVA_1_5_VERSION) {
2290 if (method_attribute_name == vmSymbols::tag_signature()) {
2291 if (method_attribute_length != 2) {
2292 classfile_parse_error(
2293 "Invalid Signature attribute length %u in class file %s",
2294 method_attribute_length, CHECK_(nullHandle));
2295 }
2296 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2297 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2298 if (runtime_visible_annotations != NULL) {
2299 classfile_parse_error(
2300 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2301 }
2302 runtime_visible_annotations_length = method_attribute_length;
2303 runtime_visible_annotations = cfs->get_u1_buffer();
2304 assert(runtime_visible_annotations != NULL, "null visible annotations");
2305 parse_annotations(runtime_visible_annotations,
2306 runtime_visible_annotations_length, &parsed_annotations);
2307 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2308 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2309 if (runtime_invisible_annotations_exists) {
2310 classfile_parse_error(
2311 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2312 }
2313 runtime_invisible_annotations_exists = true;
2314 if (PreserveAllAnnotations) {
2315 runtime_invisible_annotations_length = method_attribute_length;
2316 runtime_invisible_annotations = cfs->get_u1_buffer();
2317 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2318 }
2319 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2320 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2321 if (runtime_visible_parameter_annotations != NULL) {
2322 classfile_parse_error(
2323 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2324 }
2325 runtime_visible_parameter_annotations_length = method_attribute_length;
2326 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2327 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2328 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2329 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2330 if (runtime_invisible_parameter_annotations_exists) {
2331 classfile_parse_error(
2332 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2333 }
2334 runtime_invisible_parameter_annotations_exists = true;
2335 if (PreserveAllAnnotations) {
2336 runtime_invisible_parameter_annotations_length = method_attribute_length;
2337 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2338 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2339 }
2340 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2341 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2342 if (annotation_default != NULL) {
2343 classfile_parse_error(
2344 "Multiple AnnotationDefault attributes for method in class file %s",
2345 CHECK_(nullHandle));
2346 }
2347 annotation_default_length = method_attribute_length;
2348 annotation_default = cfs->get_u1_buffer();
2349 assert(annotation_default != NULL, "null annotation default");
2350 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2351 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2352 if (runtime_visible_type_annotations != NULL) {
2353 classfile_parse_error(
2354 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2355 CHECK_(nullHandle));
2356 }
2357 runtime_visible_type_annotations_length = method_attribute_length;
2358 runtime_visible_type_annotations = cfs->get_u1_buffer();
2359 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2360 // No need for the VM to parse Type annotations
2361 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2362 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2363 if (runtime_invisible_type_annotations_exists) {
2364 classfile_parse_error(
2365 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2366 CHECK_(nullHandle));
2367 } else {
2368 runtime_invisible_type_annotations_exists = true;
2369 }
2370 if (PreserveAllAnnotations) {
2371 runtime_invisible_type_annotations_length = method_attribute_length;
2372 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2373 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2374 }
2375 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2376 } else {
2377 // Skip unknown attributes
2378 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2379 }
2380 } else {
2381 // Skip unknown attributes
2382 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2383 }
2384 }
2385
2386 if (linenumber_table != NULL) {
2387 linenumber_table->write_terminator();
2388 linenumber_table_length = linenumber_table->position();
2389 }
2390
2391 // Make sure there's at least one Code attribute in non-native/non-abstract method
2392 if (_need_verify) {
2393 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2394 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2395 }
2396
2397 // All sizing information for a Method* is finally available, now create it
2398 InlineTableSizes sizes(
2399 total_lvt_length,
2400 linenumber_table_length,
2401 exception_table_length,
2402 checked_exceptions_length,
2403 method_parameters_length,
2404 generic_signature_index,
2405 runtime_visible_annotations_length +
2406 runtime_invisible_annotations_length,
2407 runtime_visible_parameter_annotations_length +
2408 runtime_invisible_parameter_annotations_length,
2409 runtime_visible_type_annotations_length +
2410 runtime_invisible_type_annotations_length,
2411 annotation_default_length,
2412 0);
2413
2414 Method* m = Method::allocate(
2415 _loader_data, code_length, access_flags, &sizes,
2416 ConstMethod::NORMAL, CHECK_(nullHandle));
2417
2418 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2419
2420 // Fill in information from fixed part (access_flags already set)
2421 m->set_constants(_cp);
2422 m->set_name_index(name_index);
2423 m->set_signature_index(signature_index);
2424 #ifdef CC_INTERP
2425 // hmm is there a gc issue here??
2426 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2427 m->set_result_index(rtf.type());
2428 #endif
2429
2430 if (args_size >= 0) {
2431 m->set_size_of_parameters(args_size);
2432 } else {
2433 m->compute_size_of_parameters(THREAD);
2434 }
2435 #ifdef ASSERT
2436 if (args_size >= 0) {
2437 m->compute_size_of_parameters(THREAD);
2438 assert(args_size == m->size_of_parameters(), "");
2439 }
2440 #endif
2441
2442 // Fill in code attribute information
2443 m->set_max_stack(max_stack);
2444 m->set_max_locals(max_locals);
2445 if (stackmap_data != NULL) {
2446 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2447 stackmap_data_length, CHECK_NULL);
2448 }
2449
2450 // Copy byte codes
2451 m->set_code(code_start);
2452
2453 // Copy line number table
2454 if (linenumber_table != NULL) {
2455 memcpy(m->compressed_linenumber_table(),
2456 linenumber_table->buffer(), linenumber_table_length);
2457 }
2458
2459 // Copy exception table
2460 if (exception_table_length > 0) {
2461 int size =
2462 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2463 copy_u2_with_conversion((u2*) m->exception_table_start(),
2464 exception_table_start, size);
2465 }
2466
2467 // Copy method parameters
2468 if (method_parameters_length > 0) {
2469 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2470 for (int i = 0; i < method_parameters_length; i++) {
2471 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2472 method_parameters_data += 2;
2473 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2474 method_parameters_data += 2;
2475 }
2476 }
2477
2478 // Copy checked exceptions
2479 if (checked_exceptions_length > 0) {
2480 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2481 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2482 }
2483
2484 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2485 if (total_lvt_length > 0) {
2486 promoted_flags->set_has_localvariable_table();
2487 copy_localvariable_table(m->constMethod(), lvt_cnt,
2488 localvariable_table_length,
2489 localvariable_table_start,
2490 lvtt_cnt,
2491 localvariable_type_table_length,
2492 localvariable_type_table_start, CHECK_NULL);
2493 }
2494
2495 if (parsed_annotations.has_any_annotations())
2496 parsed_annotations.apply_to(m);
2497
2498 // Copy annotations
2499 copy_method_annotations(m->constMethod(),
2500 runtime_visible_annotations,
2501 runtime_visible_annotations_length,
2502 runtime_invisible_annotations,
2503 runtime_invisible_annotations_length,
2504 runtime_visible_parameter_annotations,
2505 runtime_visible_parameter_annotations_length,
2506 runtime_invisible_parameter_annotations,
2507 runtime_invisible_parameter_annotations_length,
2508 runtime_visible_type_annotations,
2509 runtime_visible_type_annotations_length,
2510 runtime_invisible_type_annotations,
2511 runtime_invisible_type_annotations_length,
2512 annotation_default,
2513 annotation_default_length,
2514 CHECK_NULL);
2515
2516 if (name == vmSymbols::finalize_method_name() &&
2517 signature == vmSymbols::void_method_signature()) {
2518 if (m->is_empty_method()) {
2519 _has_empty_finalizer = true;
2520 } else {
2521 _has_finalizer = true;
2522 }
2523 }
2524 if (name == vmSymbols::object_initializer_name() &&
2525 signature == vmSymbols::void_method_signature() &&
2526 m->is_vanilla_constructor()) {
2527 _has_vanilla_constructor = true;
2528 }
2529
2530 NOT_PRODUCT(m->verify());
2531 return m;
2532 }
2533
2534
2535 // The promoted_flags parameter is used to pass relevant access_flags
2536 // from the methods back up to the containing klass. These flag values
2537 // are added to klass's access_flags.
2538
2539 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2540 AccessFlags* promoted_flags,
2541 bool* has_final_method,
2542 bool* declares_default_methods,
2543 TRAPS) {
2544 ClassFileStream* cfs = stream();
2545 cfs->guarantee_more(2, CHECK_NULL); // length
2546 u2 length = cfs->get_u2_fast();
2547 if (length == 0) {
2548 _methods = Universe::the_empty_method_array();
2549 } else {
2550 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2551
2552 HandleMark hm(THREAD);
2553 for (int index = 0; index < length; index++) {
2554 methodHandle method = parse_method(is_interface,
2555 promoted_flags,
2556 CHECK_NULL);
2557
2558 if (method->is_final()) {
2559 *has_final_method = true;
2560 }
2561 // declares_default_methods: declares concrete instance methods, any access flags
2562 // used for interface initialization, and default method inheritance analysis
2563 if (is_interface && !(*declares_default_methods)
2564 && !method->is_abstract() && !method->is_static()) {
2565 *declares_default_methods = true;
2566 }
2567 _methods->at_put(index, method());
2568 }
2569
2570 if (_need_verify && length > 1) {
2571 // Check duplicated methods
2572 ResourceMark rm(THREAD);
2573 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2574 THREAD, NameSigHash*, HASH_ROW_SIZE);
2575 initialize_hashtable(names_and_sigs);
2576 bool dup = false;
2577 {
2578 debug_only(No_Safepoint_Verifier nsv;)
2579 for (int i = 0; i < length; i++) {
2580 Method* m = _methods->at(i);
2581 // If no duplicates, add name/signature in hashtable names_and_sigs.
2582 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2583 dup = true;
2584 break;
2585 }
2586 }
2587 }
2588 if (dup) {
2589 classfile_parse_error("Duplicate method name&signature in class file %s",
2590 CHECK_NULL);
2591 }
2592 }
2593 }
2594 return _methods;
2595 }
2596
2597
2598 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2599 int length = methods->length();
2600 // If JVMTI original method ordering or sharing is enabled we have to
2601 // remember the original class file ordering.
2602 // We temporarily use the vtable_index field in the Method* to store the
2603 // class file index, so we can read in after calling qsort.
2604 // Put the method ordering in the shared archive.
2605 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2606 for (int index = 0; index < length; index++) {
2607 Method* m = methods->at(index);
2608 assert(!m->valid_vtable_index(), "vtable index should not be set");
2609 m->set_vtable_index(index);
2610 }
2611 }
2612 // Sort method array by ascending method name (for faster lookups & vtable construction)
2613 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2614 Method::sort_methods(methods);
2615
2616 intArray* method_ordering = NULL;
2617 // If JVMTI original method ordering or sharing is enabled construct int
2618 // array remembering the original ordering
2619 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2620 method_ordering = new intArray(length);
2621 for (int index = 0; index < length; index++) {
2622 Method* m = methods->at(index);
2623 int old_index = m->vtable_index();
2624 assert(old_index >= 0 && old_index < length, "invalid method index");
2625 method_ordering->at_put(index, old_index);
2626 m->set_vtable_index(Method::invalid_vtable_index);
2627 }
2628 }
2629 return method_ordering;
2630 }
2631
2632 // Parse generic_signature attribute for methods and fields
2633 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2634 ClassFileStream* cfs = stream();
2635 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2636 u2 generic_signature_index = cfs->get_u2_fast();
2637 check_property(
2638 valid_symbol_at(generic_signature_index),
2639 "Invalid Signature attribute at constant pool index %u in class file %s",
2640 generic_signature_index, CHECK_0);
2641 return generic_signature_index;
2642 }
2643
2644 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2645 ClassFileStream* cfs = stream();
2646 cfs->guarantee_more(2, CHECK); // sourcefile_index
2647 u2 sourcefile_index = cfs->get_u2_fast();
2648 check_property(
2649 valid_symbol_at(sourcefile_index),
2650 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2651 sourcefile_index, CHECK);
2652 set_class_sourcefile_index(sourcefile_index);
2653 }
2654
2655
2656
2657 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2658 ClassFileStream* cfs = stream();
2659 u1* sde_buffer = cfs->get_u1_buffer();
2660 assert(sde_buffer != NULL, "null sde buffer");
2661
2662 // Don't bother storing it if there is no way to retrieve it
2663 if (JvmtiExport::can_get_source_debug_extension()) {
2664 assert((length+1) > length, "Overflow checking");
2665 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2666 for (int i = 0; i < length; i++) {
2667 sde[i] = sde_buffer[i];
2668 }
2669 sde[length] = '\0';
2670 set_class_sde_buffer((char*)sde, length);
2671 }
2672 // Got utf8 string, set stream position forward
2673 cfs->skip_u1(length, CHECK);
2674 }
2675
2676
2677 // Inner classes can be static, private or protected (classic VM does this)
2678 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2679
2680 // Return number of classes in the inner classes attribute table
2681 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2682 bool parsed_enclosingmethod_attribute,
2683 u2 enclosing_method_class_index,
2684 u2 enclosing_method_method_index,
2685 TRAPS) {
2686 ClassFileStream* cfs = stream();
2687 u1* current_mark = cfs->current();
2688 u2 length = 0;
2689 if (inner_classes_attribute_start != NULL) {
2690 cfs->set_current(inner_classes_attribute_start);
2691 cfs->guarantee_more(2, CHECK_0); // length
2692 length = cfs->get_u2_fast();
2693 }
2694
2695 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2696 // method data:
2697 // [inner_class_info_index,
2698 // outer_class_info_index,
2699 // inner_name_index,
2700 // inner_class_access_flags,
2701 // ...
2702 // enclosing_method_class_index,
2703 // enclosing_method_method_index]
2704 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2705 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2706 _inner_classes = inner_classes;
2707
2708 int index = 0;
2709 int cp_size = _cp->length();
2710 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2711 for (int n = 0; n < length; n++) {
2712 // Inner class index
2713 u2 inner_class_info_index = cfs->get_u2_fast();
2714 check_property(
2715 valid_klass_reference_at(inner_class_info_index),
2716 "inner_class_info_index %u has bad constant type in class file %s",
2717 inner_class_info_index, CHECK_0);
2718 // Outer class index
2719 u2 outer_class_info_index = cfs->get_u2_fast();
2720 check_property(
2721 outer_class_info_index == 0 ||
2722 valid_klass_reference_at(outer_class_info_index),
2723 "outer_class_info_index %u has bad constant type in class file %s",
2724 outer_class_info_index, CHECK_0);
2725 // Inner class name
2726 u2 inner_name_index = cfs->get_u2_fast();
2727 check_property(
2728 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2729 "inner_name_index %u has bad constant type in class file %s",
2730 inner_name_index, CHECK_0);
2731 if (_need_verify) {
2732 guarantee_property(inner_class_info_index != outer_class_info_index,
2733 "Class is both outer and inner class in class file %s", CHECK_0);
2734 }
2735 // Access flags
2736 AccessFlags inner_access_flags;
2737 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2738 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2739 // Set abstract bit for old class files for backward compatibility
2740 flags |= JVM_ACC_ABSTRACT;
2741 }
2742 verify_legal_class_modifiers(flags, CHECK_0);
2743 inner_access_flags.set_flags(flags);
2744
2745 inner_classes->at_put(index++, inner_class_info_index);
2746 inner_classes->at_put(index++, outer_class_info_index);
2747 inner_classes->at_put(index++, inner_name_index);
2748 inner_classes->at_put(index++, inner_access_flags.as_short());
2749 }
2750
2751 // 4347400: make sure there's no duplicate entry in the classes array
2752 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2753 for(int i = 0; i < length * 4; i += 4) {
2754 for(int j = i + 4; j < length * 4; j += 4) {
2755 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2756 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2757 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2758 inner_classes->at(i+3) != inner_classes->at(j+3)),
2759 "Duplicate entry in InnerClasses in class file %s",
2760 CHECK_0);
2761 }
2762 }
2763 }
2764
2765 // Set EnclosingMethod class and method indexes.
2766 if (parsed_enclosingmethod_attribute) {
2767 inner_classes->at_put(index++, enclosing_method_class_index);
2768 inner_classes->at_put(index++, enclosing_method_method_index);
2769 }
2770 assert(index == size, "wrong size");
2771
2772 // Restore buffer's current position.
2773 cfs->set_current(current_mark);
2774
2775 return length;
2776 }
2777
2778 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2779 set_class_synthetic_flag(true);
2780 }
2781
2782 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2783 ClassFileStream* cfs = stream();
2784 u2 signature_index = cfs->get_u2(CHECK);
2785 check_property(
2786 valid_symbol_at(signature_index),
2787 "Invalid constant pool index %u in Signature attribute in class file %s",
2788 signature_index, CHECK);
2789 set_class_generic_signature_index(signature_index);
2790 }
2791
2792 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2793 ClassFileStream* cfs = stream();
2794 u1* current_start = cfs->current();
2795
2796 guarantee_property(attribute_byte_length >= sizeof(u2),
2797 "Invalid BootstrapMethods attribute length %u in class file %s",
2798 attribute_byte_length,
2799 CHECK);
2800
2801 cfs->guarantee_more(attribute_byte_length, CHECK);
2802
2803 int attribute_array_length = cfs->get_u2_fast();
2804
2805 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2806 "Short length on BootstrapMethods in class file %s",
2807 CHECK);
2808
2809
2810 // The attribute contains a counted array of counted tuples of shorts,
2811 // represending bootstrap specifiers:
2812 // length*{bootstrap_method_index, argument_count*{argument_index}}
2813 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2814 // operand_count = number of shorts in attr, except for leading length
2815
2816 // The attribute is copied into a short[] array.
2817 // The array begins with a series of short[2] pairs, one for each tuple.
2818 int index_size = (attribute_array_length * 2);
2819
2820 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2821
2822 // Eagerly assign operands so they will be deallocated with the constant
2823 // pool if there is an error.
2824 _cp->set_operands(operands);
2825
2826 int operand_fill_index = index_size;
2827 int cp_size = _cp->length();
2828
2829 for (int n = 0; n < attribute_array_length; n++) {
2830 // Store a 32-bit offset into the header of the operand array.
2831 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2832
2833 // Read a bootstrap specifier.
2834 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2835 u2 bootstrap_method_index = cfs->get_u2_fast();
2836 u2 argument_count = cfs->get_u2_fast();
2837 check_property(
2838 valid_cp_range(bootstrap_method_index, cp_size) &&
2839 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2840 "bootstrap_method_index %u has bad constant type in class file %s",
2841 bootstrap_method_index,
2842 CHECK);
2843
2844 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2845 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2846 CHECK);
2847
2848 operands->at_put(operand_fill_index++, bootstrap_method_index);
2849 operands->at_put(operand_fill_index++, argument_count);
2850
2851 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2852 for (int j = 0; j < argument_count; j++) {
2853 u2 argument_index = cfs->get_u2_fast();
2854 check_property(
2855 valid_cp_range(argument_index, cp_size) &&
2856 _cp->tag_at(argument_index).is_loadable_constant(),
2857 "argument_index %u has bad constant type in class file %s",
2858 argument_index,
2859 CHECK);
2860 operands->at_put(operand_fill_index++, argument_index);
2861 }
2862 }
2863
2864 u1* current_end = cfs->current();
2865 guarantee_property(current_end == current_start + attribute_byte_length,
2866 "Bad length on BootstrapMethods in class file %s",
2867 CHECK);
2868 }
2869
2870 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2871 TRAPS) {
2872 ClassFileStream* cfs = stream();
2873 // Set inner classes attribute to default sentinel
2874 _inner_classes = Universe::the_empty_short_array();
2875 cfs->guarantee_more(2, CHECK); // attributes_count
2876 u2 attributes_count = cfs->get_u2_fast();
2877 bool parsed_sourcefile_attribute = false;
2878 bool parsed_innerclasses_attribute = false;
2879 bool parsed_enclosingmethod_attribute = false;
2880 bool parsed_bootstrap_methods_attribute = false;
2881 u1* runtime_visible_annotations = NULL;
2882 int runtime_visible_annotations_length = 0;
2883 u1* runtime_invisible_annotations = NULL;
2884 int runtime_invisible_annotations_length = 0;
2885 u1* runtime_visible_type_annotations = NULL;
2886 int runtime_visible_type_annotations_length = 0;
2887 u1* runtime_invisible_type_annotations = NULL;
2888 int runtime_invisible_type_annotations_length = 0;
2889 bool runtime_invisible_type_annotations_exists = false;
2890 bool runtime_invisible_annotations_exists = false;
2891 bool parsed_source_debug_ext_annotations_exist = false;
2892 u1* inner_classes_attribute_start = NULL;
2893 u4 inner_classes_attribute_length = 0;
2894 u2 enclosing_method_class_index = 0;
2895 u2 enclosing_method_method_index = 0;
2896 // Iterate over attributes
2897 while (attributes_count--) {
2898 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2899 u2 attribute_name_index = cfs->get_u2_fast();
2900 u4 attribute_length = cfs->get_u4_fast();
2901 check_property(
2902 valid_symbol_at(attribute_name_index),
2903 "Attribute name has bad constant pool index %u in class file %s",
2904 attribute_name_index, CHECK);
2905 Symbol* tag = _cp->symbol_at(attribute_name_index);
2906 if (tag == vmSymbols::tag_source_file()) {
2907 // Check for SourceFile tag
2908 if (_need_verify) {
2909 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2910 }
2911 if (parsed_sourcefile_attribute) {
2912 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2913 } else {
2914 parsed_sourcefile_attribute = true;
2915 }
2916 parse_classfile_sourcefile_attribute(CHECK);
2917 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2918 // Check for SourceDebugExtension tag
2919 if (parsed_source_debug_ext_annotations_exist) {
2920 classfile_parse_error(
2921 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2922 }
2923 parsed_source_debug_ext_annotations_exist = true;
2924 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2925 } else if (tag == vmSymbols::tag_inner_classes()) {
2926 // Check for InnerClasses tag
2927 if (parsed_innerclasses_attribute) {
2928 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2929 } else {
2930 parsed_innerclasses_attribute = true;
2931 }
2932 inner_classes_attribute_start = cfs->get_u1_buffer();
2933 inner_classes_attribute_length = attribute_length;
2934 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2935 } else if (tag == vmSymbols::tag_synthetic()) {
2936 // Check for Synthetic tag
2937 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2938 if (attribute_length != 0) {
2939 classfile_parse_error(
2940 "Invalid Synthetic classfile attribute length %u in class file %s",
2941 attribute_length, CHECK);
2942 }
2943 parse_classfile_synthetic_attribute(CHECK);
2944 } else if (tag == vmSymbols::tag_deprecated()) {
2945 // Check for Deprecatd tag - 4276120
2946 if (attribute_length != 0) {
2947 classfile_parse_error(
2948 "Invalid Deprecated classfile attribute length %u in class file %s",
2949 attribute_length, CHECK);
2950 }
2951 } else if (_major_version >= JAVA_1_5_VERSION) {
2952 if (tag == vmSymbols::tag_signature()) {
2953 if (attribute_length != 2) {
2954 classfile_parse_error(
2955 "Wrong Signature attribute length %u in class file %s",
2956 attribute_length, CHECK);
2957 }
2958 parse_classfile_signature_attribute(CHECK);
2959 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2960 if (runtime_visible_annotations != NULL) {
2961 classfile_parse_error(
2962 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2963 }
2964 runtime_visible_annotations_length = attribute_length;
2965 runtime_visible_annotations = cfs->get_u1_buffer();
2966 assert(runtime_visible_annotations != NULL, "null visible annotations");
2967 parse_annotations(runtime_visible_annotations,
2968 runtime_visible_annotations_length,
2969 parsed_annotations);
2970 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2971 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2972 if (runtime_invisible_annotations_exists) {
2973 classfile_parse_error(
2974 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2975 }
2976 runtime_invisible_annotations_exists = true;
2977 if (PreserveAllAnnotations) {
2978 runtime_invisible_annotations_length = attribute_length;
2979 runtime_invisible_annotations = cfs->get_u1_buffer();
2980 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2981 }
2982 cfs->skip_u1(attribute_length, CHECK);
2983 } else if (tag == vmSymbols::tag_enclosing_method()) {
2984 if (parsed_enclosingmethod_attribute) {
2985 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2986 } else {
2987 parsed_enclosingmethod_attribute = true;
2988 }
2989 guarantee_property(attribute_length == 4,
2990 "Wrong EnclosingMethod attribute length %u in class file %s",
2991 attribute_length, CHECK);
2992 cfs->guarantee_more(4, CHECK); // class_index, method_index
2993 enclosing_method_class_index = cfs->get_u2_fast();
2994 enclosing_method_method_index = cfs->get_u2_fast();
2995 if (enclosing_method_class_index == 0) {
2996 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2997 }
2998 // Validate the constant pool indices and types
2999 check_property(valid_klass_reference_at(enclosing_method_class_index),
3000 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3001 if (enclosing_method_method_index != 0 &&
3002 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3003 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3004 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3005 }
3006 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3007 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3008 if (parsed_bootstrap_methods_attribute)
3009 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3010 parsed_bootstrap_methods_attribute = true;
3011 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3012 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3013 if (runtime_visible_type_annotations != NULL) {
3014 classfile_parse_error(
3015 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3016 }
3017 runtime_visible_type_annotations_length = attribute_length;
3018 runtime_visible_type_annotations = cfs->get_u1_buffer();
3019 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3020 // No need for the VM to parse Type annotations
3021 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3022 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3023 if (runtime_invisible_type_annotations_exists) {
3024 classfile_parse_error(
3025 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3026 } else {
3027 runtime_invisible_type_annotations_exists = true;
3028 }
3029 if (PreserveAllAnnotations) {
3030 runtime_invisible_type_annotations_length = attribute_length;
3031 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3032 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3033 }
3034 cfs->skip_u1(attribute_length, CHECK);
3035 } else {
3036 // Unknown attribute
3037 cfs->skip_u1(attribute_length, CHECK);
3038 }
3039 } else {
3040 // Unknown attribute
3041 cfs->skip_u1(attribute_length, CHECK);
3042 }
3043 }
3044 _annotations = assemble_annotations(runtime_visible_annotations,
3045 runtime_visible_annotations_length,
3046 runtime_invisible_annotations,
3047 runtime_invisible_annotations_length,
3048 CHECK);
3049 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3050 runtime_visible_type_annotations_length,
3051 runtime_invisible_type_annotations,
3052 runtime_invisible_type_annotations_length,
3053 CHECK);
3054
3055 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3056 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3057 inner_classes_attribute_start,
3058 parsed_innerclasses_attribute,
3059 enclosing_method_class_index,
3060 enclosing_method_method_index,
3061 CHECK);
3062 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3063 guarantee_property(
3064 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3065 "Wrong InnerClasses attribute length in class file %s", CHECK);
3066 }
3067 }
3068
3069 if (_max_bootstrap_specifier_index >= 0) {
3070 guarantee_property(parsed_bootstrap_methods_attribute,
3071 "Missing BootstrapMethods attribute in class file %s", CHECK);
3072 }
3073 }
3074
3075 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3076 if (_synthetic_flag)
3077 k->set_is_synthetic();
3078 if (_sourcefile_index != 0) {
3079 k->set_source_file_name_index(_sourcefile_index);
3080 }
3081 if (_generic_signature_index != 0) {
3082 k->set_generic_signature_index(_generic_signature_index);
3083 }
3084 if (_sde_buffer != NULL) {
3085 k->set_source_debug_extension(_sde_buffer, _sde_length);
3086 }
3087 }
3088
3089 // Create the Annotations object that will
3090 // hold the annotations array for the Klass.
3091 void ClassFileParser::create_combined_annotations(TRAPS) {
3092 if (_annotations == NULL &&
3093 _type_annotations == NULL &&
3094 _fields_annotations == NULL &&
3095 _fields_type_annotations == NULL) {
3096 // Don't create the Annotations object unnecessarily.
3097 return;
3098 }
3099
3100 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3101 annotations->set_class_annotations(_annotations);
3102 annotations->set_class_type_annotations(_type_annotations);
3103 annotations->set_fields_annotations(_fields_annotations);
3104 annotations->set_fields_type_annotations(_fields_type_annotations);
3105
3106 // This is the Annotations object that will be
3107 // assigned to InstanceKlass being constructed.
3108 _combined_annotations = annotations;
3109
3110 // The annotations arrays below has been transfered the
3111 // _combined_annotations so these fields can now be cleared.
3112 _annotations = NULL;
3113 _type_annotations = NULL;
3114 _fields_annotations = NULL;
3115 _fields_type_annotations = NULL;
3116 }
3117
3118 // Transfer ownership of metadata allocated to the InstanceKlass.
3119 void ClassFileParser::apply_parsed_class_metadata(
3120 instanceKlassHandle this_klass,
3121 int java_fields_count, TRAPS) {
3122 _cp->set_pool_holder(this_klass());
3123 this_klass->set_constants(_cp);
3124 this_klass->set_fields(_fields, java_fields_count);
3125 this_klass->set_methods(_methods);
3126 this_klass->set_inner_classes(_inner_classes);
3127 this_klass->set_local_interfaces(_local_interfaces);
3128 this_klass->set_transitive_interfaces(_transitive_interfaces);
3129 this_klass->set_annotations(_combined_annotations);
3130
3131 // Clear out these fields so they don't get deallocated by the destructor
3132 clear_class_metadata();
3133 }
3134
3135 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3136 int runtime_visible_annotations_length,
3137 u1* runtime_invisible_annotations,
3138 int runtime_invisible_annotations_length, TRAPS) {
3139 AnnotationArray* annotations = NULL;
3140 if (runtime_visible_annotations != NULL ||
3141 runtime_invisible_annotations != NULL) {
3142 annotations = MetadataFactory::new_array<u1>(_loader_data,
3143 runtime_visible_annotations_length +
3144 runtime_invisible_annotations_length,
3145 CHECK_(annotations));
3146 if (runtime_visible_annotations != NULL) {
3147 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3148 annotations->at_put(i, runtime_visible_annotations[i]);
3149 }
3150 }
3151 if (runtime_invisible_annotations != NULL) {
3152 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3153 int append = runtime_visible_annotations_length+i;
3154 annotations->at_put(append, runtime_invisible_annotations[i]);
3155 }
3156 }
3157 }
3158 return annotations;
3159 }
3160
3161 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3162 TRAPS) {
3163 instanceKlassHandle super_klass;
3164 if (super_class_index == 0) {
3165 check_property(_class_name == vmSymbols::java_lang_Object(),
3166 "Invalid superclass index %u in class file %s",
3167 super_class_index,
3168 CHECK_NULL);
3169 } else {
3170 check_property(valid_klass_reference_at(super_class_index),
3171 "Invalid superclass index %u in class file %s",
3172 super_class_index,
3173 CHECK_NULL);
3174 // The class name should be legal because it is checked when parsing constant pool.
3175 // However, make sure it is not an array type.
3176 bool is_array = false;
3177 if (_cp->tag_at(super_class_index).is_klass()) {
3178 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3179 if (_need_verify) {
3180 is_array = super_klass->is_array_klass();
3181 }
3182 } else if (_need_verify) {
3183 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3184 }
3185 if (_need_verify) {
3186 guarantee_property(!is_array,
3187 "Bad superclass name in class file %s", CHECK_NULL);
3188 }
3189 }
3190 return super_klass;
3191 }
3192
3193
3194 // Values needed for oopmap and InstanceKlass creation
3195 class FieldLayoutInfo : public StackObj {
3196 public:
3197 int* nonstatic_oop_offsets;
3198 unsigned int* nonstatic_oop_counts;
3199 unsigned int nonstatic_oop_map_count;
3200 unsigned int total_oop_map_count;
3201 int instance_size;
3202 int nonstatic_field_size;
3203 int static_field_size;
3204 bool has_nonstatic_fields;
3205 };
3206
3207 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3208 void ClassFileParser::layout_fields(Handle class_loader,
3209 FieldAllocationCount* fac,
3210 ClassAnnotationCollector* parsed_annotations,
3211 FieldLayoutInfo* info,
3212 TRAPS) {
3213
3214 // Field size and offset computation
3215 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3216 int next_static_oop_offset = 0;
3217 int next_static_double_offset = 0;
3218 int next_static_word_offset = 0;
3219 int next_static_short_offset = 0;
3220 int next_static_byte_offset = 0;
3221 int next_nonstatic_oop_offset = 0;
3222 int next_nonstatic_double_offset = 0;
3223 int next_nonstatic_word_offset = 0;
3224 int next_nonstatic_short_offset = 0;
3225 int next_nonstatic_byte_offset = 0;
3226 int first_nonstatic_oop_offset = 0;
3227 int next_nonstatic_field_offset = 0;
3228 int next_nonstatic_padded_offset = 0;
3229
3230 // Count the contended fields by type.
3231 //
3232 // We ignore static fields, because @Contended is not supported for them.
3233 // The layout code below will also ignore the static fields.
3234 int nonstatic_contended_count = 0;
3235 FieldAllocationCount fac_contended;
3236 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3237 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3238 if (fs.is_contended()) {
3239 fac_contended.count[atype]++;
3240 if (!fs.access_flags().is_static()) {
3241 nonstatic_contended_count++;
3242 }
3243 }
3244 }
3245
3246
3247 // Calculate the starting byte offsets
3248 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3249 next_static_double_offset = next_static_oop_offset +
3250 ((fac->count[STATIC_OOP]) * heapOopSize);
3251 if ( fac->count[STATIC_DOUBLE] &&
3252 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3253 Universe::field_type_should_be_aligned(T_LONG)) ) {
3254 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3255 }
3256
3257 next_static_word_offset = next_static_double_offset +
3258 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3259 next_static_short_offset = next_static_word_offset +
3260 ((fac->count[STATIC_WORD]) * BytesPerInt);
3261 next_static_byte_offset = next_static_short_offset +
3262 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3263
3264 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3265 nonstatic_field_size * heapOopSize;
3266
3267 next_nonstatic_field_offset = nonstatic_fields_start;
3268
3269 bool is_contended_class = parsed_annotations->is_contended();
3270
3271 // Class is contended, pad before all the fields
3272 if (is_contended_class) {
3273 next_nonstatic_field_offset += ContendedPaddingWidth;
3274 }
3275
3276 // Compute the non-contended fields count.
3277 // The packing code below relies on these counts to determine if some field
3278 // can be squeezed into the alignment gap. Contended fields are obviously
3279 // exempt from that.
3280 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3281 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3282 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3283 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3284 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3285
3286 // Total non-static fields count, including every contended field
3287 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3288 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3289 fac->count[NONSTATIC_OOP];
3290
3291 bool super_has_nonstatic_fields =
3292 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3293 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3294
3295
3296 // Prepare list of oops for oop map generation.
3297 //
3298 // "offset" and "count" lists are describing the set of contiguous oop
3299 // regions. offset[i] is the start of the i-th region, which then has
3300 // count[i] oops following. Before we know how many regions are required,
3301 // we pessimistically allocate the maps to fit all the oops into the
3302 // distinct regions.
3303 //
3304 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3305 // to figure out if we still need to do this.
3306 int* nonstatic_oop_offsets;
3307 unsigned int* nonstatic_oop_counts;
3308 unsigned int nonstatic_oop_map_count = 0;
3309 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3310
3311 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3312 THREAD, int, max_nonstatic_oop_maps);
3313 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3314 THREAD, unsigned int, max_nonstatic_oop_maps);
3315
3316 first_nonstatic_oop_offset = 0; // will be set for first oop field
3317
3318 bool compact_fields = CompactFields;
3319 int allocation_style = FieldsAllocationStyle;
3320 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3321 assert(false, "0 <= FieldsAllocationStyle <= 2");
3322 allocation_style = 1; // Optimistic
3323 }
3324
3325 // The next classes have predefined hard-coded fields offsets
3326 // (see in JavaClasses::compute_hard_coded_offsets()).
3327 // Use default fields allocation order for them.
3328 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3329 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3330 _class_name == vmSymbols::java_lang_Class() ||
3331 _class_name == vmSymbols::java_lang_ClassLoader() ||
3332 _class_name == vmSymbols::java_lang_ref_Reference() ||
3333 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3334 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3335 _class_name == vmSymbols::java_lang_String() ||
3336 _class_name == vmSymbols::java_lang_Throwable() ||
3337 _class_name == vmSymbols::java_lang_Boolean() ||
3338 _class_name == vmSymbols::java_lang_Character() ||
3339 _class_name == vmSymbols::java_lang_Float() ||
3340 _class_name == vmSymbols::java_lang_Double() ||
3341 _class_name == vmSymbols::java_lang_Byte() ||
3342 _class_name == vmSymbols::java_lang_Short() ||
3343 _class_name == vmSymbols::java_lang_Integer() ||
3344 _class_name == vmSymbols::java_lang_Long())) {
3345 allocation_style = 0; // Allocate oops first
3346 compact_fields = false; // Don't compact fields
3347 }
3348
3349 // Rearrange fields for a given allocation style
3350 if( allocation_style == 0 ) {
3351 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3352 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3353 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3354 (nonstatic_oop_count * heapOopSize);
3355 } else if( allocation_style == 1 ) {
3356 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3357 next_nonstatic_double_offset = next_nonstatic_field_offset;
3358 } else if( allocation_style == 2 ) {
3359 // Fields allocation: oops fields in super and sub classes are together.
3360 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3361 _super_klass->nonstatic_oop_map_size() > 0 ) {
3362 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3363 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3364 OopMapBlock* last_map = first_map + map_count - 1;
3365 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3366 if (next_offset == next_nonstatic_field_offset) {
3367 allocation_style = 0; // allocate oops first
3368 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3369 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3370 (nonstatic_oop_count * heapOopSize);
3371 }
3372 }
3373 if( allocation_style == 2 ) {
3374 allocation_style = 1; // allocate oops last
3375 next_nonstatic_double_offset = next_nonstatic_field_offset;
3376 }
3377 } else {
3378 ShouldNotReachHere();
3379 }
3380
3381 int nonstatic_oop_space_count = 0;
3382 int nonstatic_word_space_count = 0;
3383 int nonstatic_short_space_count = 0;
3384 int nonstatic_byte_space_count = 0;
3385 int nonstatic_oop_space_offset = 0;
3386 int nonstatic_word_space_offset = 0;
3387 int nonstatic_short_space_offset = 0;
3388 int nonstatic_byte_space_offset = 0;
3389
3390 // Try to squeeze some of the fields into the gaps due to
3391 // long/double alignment.
3392 if( nonstatic_double_count > 0 ) {
3393 int offset = next_nonstatic_double_offset;
3394 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3395 if( compact_fields && offset != next_nonstatic_double_offset ) {
3396 // Allocate available fields into the gap before double field.
3397 int length = next_nonstatic_double_offset - offset;
3398 assert(length == BytesPerInt, "");
3399 nonstatic_word_space_offset = offset;
3400 if( nonstatic_word_count > 0 ) {
3401 nonstatic_word_count -= 1;
3402 nonstatic_word_space_count = 1; // Only one will fit
3403 length -= BytesPerInt;
3404 offset += BytesPerInt;
3405 }
3406 nonstatic_short_space_offset = offset;
3407 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3408 nonstatic_short_count -= 1;
3409 nonstatic_short_space_count += 1;
3410 length -= BytesPerShort;
3411 offset += BytesPerShort;
3412 }
3413 nonstatic_byte_space_offset = offset;
3414 while( length > 0 && nonstatic_byte_count > 0 ) {
3415 nonstatic_byte_count -= 1;
3416 nonstatic_byte_space_count += 1;
3417 length -= 1;
3418 }
3419 // Allocate oop field in the gap if there are no other fields for that.
3420 nonstatic_oop_space_offset = offset;
3421 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3422 allocation_style != 0 ) { // when oop fields not first
3423 nonstatic_oop_count -= 1;
3424 nonstatic_oop_space_count = 1; // Only one will fit
3425 length -= heapOopSize;
3426 offset += heapOopSize;
3427 }
3428 }
3429 }
3430
3431 next_nonstatic_word_offset = next_nonstatic_double_offset +
3432 (nonstatic_double_count * BytesPerLong);
3433 next_nonstatic_short_offset = next_nonstatic_word_offset +
3434 (nonstatic_word_count * BytesPerInt);
3435 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3436 (nonstatic_short_count * BytesPerShort);
3437 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3438 nonstatic_byte_count;
3439
3440 // let oops jump before padding with this allocation style
3441 if( allocation_style == 1 ) {
3442 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3443 if( nonstatic_oop_count > 0 ) {
3444 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3445 }
3446 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3447 }
3448
3449 // Iterate over fields again and compute correct offsets.
3450 // The field allocation type was temporarily stored in the offset slot.
3451 // oop fields are located before non-oop fields (static and non-static).
3452 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3453
3454 // skip already laid out fields
3455 if (fs.is_offset_set()) continue;
3456
3457 // contended instance fields are handled below
3458 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3459
3460 int real_offset = 0;
3461 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3462
3463 // pack the rest of the fields
3464 switch (atype) {
3465 case STATIC_OOP:
3466 real_offset = next_static_oop_offset;
3467 next_static_oop_offset += heapOopSize;
3468 break;
3469 case STATIC_BYTE:
3470 real_offset = next_static_byte_offset;
3471 next_static_byte_offset += 1;
3472 break;
3473 case STATIC_SHORT:
3474 real_offset = next_static_short_offset;
3475 next_static_short_offset += BytesPerShort;
3476 break;
3477 case STATIC_WORD:
3478 real_offset = next_static_word_offset;
3479 next_static_word_offset += BytesPerInt;
3480 break;
3481 case STATIC_DOUBLE:
3482 real_offset = next_static_double_offset;
3483 next_static_double_offset += BytesPerLong;
3484 break;
3485 case NONSTATIC_OOP:
3486 if( nonstatic_oop_space_count > 0 ) {
3487 real_offset = nonstatic_oop_space_offset;
3488 nonstatic_oop_space_offset += heapOopSize;
3489 nonstatic_oop_space_count -= 1;
3490 } else {
3491 real_offset = next_nonstatic_oop_offset;
3492 next_nonstatic_oop_offset += heapOopSize;
3493 }
3494
3495 // Record this oop in the oop maps
3496 if( nonstatic_oop_map_count > 0 &&
3497 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3498 real_offset -
3499 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3500 heapOopSize ) {
3501 // This oop is adjacent to the previous one, add to current oop map
3502 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3503 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3504 } else {
3505 // This oop is not adjacent to the previous one, create new oop map
3506 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3507 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3508 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3509 nonstatic_oop_map_count += 1;
3510 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3511 first_nonstatic_oop_offset = real_offset;
3512 }
3513 }
3514 break;
3515 case NONSTATIC_BYTE:
3516 if( nonstatic_byte_space_count > 0 ) {
3517 real_offset = nonstatic_byte_space_offset;
3518 nonstatic_byte_space_offset += 1;
3519 nonstatic_byte_space_count -= 1;
3520 } else {
3521 real_offset = next_nonstatic_byte_offset;
3522 next_nonstatic_byte_offset += 1;
3523 }
3524 break;
3525 case NONSTATIC_SHORT:
3526 if( nonstatic_short_space_count > 0 ) {
3527 real_offset = nonstatic_short_space_offset;
3528 nonstatic_short_space_offset += BytesPerShort;
3529 nonstatic_short_space_count -= 1;
3530 } else {
3531 real_offset = next_nonstatic_short_offset;
3532 next_nonstatic_short_offset += BytesPerShort;
3533 }
3534 break;
3535 case NONSTATIC_WORD:
3536 if( nonstatic_word_space_count > 0 ) {
3537 real_offset = nonstatic_word_space_offset;
3538 nonstatic_word_space_offset += BytesPerInt;
3539 nonstatic_word_space_count -= 1;
3540 } else {
3541 real_offset = next_nonstatic_word_offset;
3542 next_nonstatic_word_offset += BytesPerInt;
3543 }
3544 break;
3545 case NONSTATIC_DOUBLE:
3546 real_offset = next_nonstatic_double_offset;
3547 next_nonstatic_double_offset += BytesPerLong;
3548 break;
3549 default:
3550 ShouldNotReachHere();
3551 }
3552 fs.set_offset(real_offset);
3553 }
3554
3555
3556 // Handle the contended cases.
3557 //
3558 // Each contended field should not intersect the cache line with another contended field.
3559 // In the absence of alignment information, we end up with pessimistically separating
3560 // the fields with full-width padding.
3561 //
3562 // Additionally, this should not break alignment for the fields, so we round the alignment up
3563 // for each field.
3564 if (nonstatic_contended_count > 0) {
3565
3566 // if there is at least one contended field, we need to have pre-padding for them
3567 next_nonstatic_padded_offset += ContendedPaddingWidth;
3568
3569 // collect all contended groups
3570 BitMap bm(_cp->size());
3571 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3572 // skip already laid out fields
3573 if (fs.is_offset_set()) continue;
3574
3575 if (fs.is_contended()) {
3576 bm.set_bit(fs.contended_group());
3577 }
3578 }
3579
3580 int current_group = -1;
3581 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3582
3583 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3584
3585 // skip already laid out fields
3586 if (fs.is_offset_set()) continue;
3587
3588 // skip non-contended fields and fields from different group
3589 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3590
3591 // handle statics below
3592 if (fs.access_flags().is_static()) continue;
3593
3594 int real_offset = 0;
3595 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3596
3597 switch (atype) {
3598 case NONSTATIC_BYTE:
3599 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3600 real_offset = next_nonstatic_padded_offset;
3601 next_nonstatic_padded_offset += 1;
3602 break;
3603
3604 case NONSTATIC_SHORT:
3605 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3606 real_offset = next_nonstatic_padded_offset;
3607 next_nonstatic_padded_offset += BytesPerShort;
3608 break;
3609
3610 case NONSTATIC_WORD:
3611 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3612 real_offset = next_nonstatic_padded_offset;
3613 next_nonstatic_padded_offset += BytesPerInt;
3614 break;
3615
3616 case NONSTATIC_DOUBLE:
3617 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3618 real_offset = next_nonstatic_padded_offset;
3619 next_nonstatic_padded_offset += BytesPerLong;
3620 break;
3621
3622 case NONSTATIC_OOP:
3623 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3624 real_offset = next_nonstatic_padded_offset;
3625 next_nonstatic_padded_offset += heapOopSize;
3626
3627 // Record this oop in the oop maps
3628 if( nonstatic_oop_map_count > 0 &&
3629 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3630 real_offset -
3631 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3632 heapOopSize ) {
3633 // This oop is adjacent to the previous one, add to current oop map
3634 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3635 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3636 } else {
3637 // This oop is not adjacent to the previous one, create new oop map
3638 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3639 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3640 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3641 nonstatic_oop_map_count += 1;
3642 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3643 first_nonstatic_oop_offset = real_offset;
3644 }
3645 }
3646 break;
3647
3648 default:
3649 ShouldNotReachHere();
3650 }
3651
3652 if (fs.contended_group() == 0) {
3653 // Contended group defines the equivalence class over the fields:
3654 // the fields within the same contended group are not inter-padded.
3655 // The only exception is default group, which does not incur the
3656 // equivalence, and so requires intra-padding.
3657 next_nonstatic_padded_offset += ContendedPaddingWidth;
3658 }
3659
3660 fs.set_offset(real_offset);
3661 } // for
3662
3663 // Start laying out the next group.
3664 // Note that this will effectively pad the last group in the back;
3665 // this is expected to alleviate memory contention effects for
3666 // subclass fields and/or adjacent object.
3667 // If this was the default group, the padding is already in place.
3668 if (current_group != 0) {
3669 next_nonstatic_padded_offset += ContendedPaddingWidth;
3670 }
3671 }
3672
3673 // handle static fields
3674 }
3675
3676 // Entire class is contended, pad in the back.
3677 // This helps to alleviate memory contention effects for subclass fields
3678 // and/or adjacent object.
3679 if (is_contended_class) {
3680 next_nonstatic_padded_offset += ContendedPaddingWidth;
3681 }
3682
3683 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3684
3685 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3686 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3687 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3688
3689 int static_field_size = (static_fields_end -
3690 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3691 nonstatic_field_size = nonstatic_field_size +
3692 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3693
3694 int instance_size = align_object_size(instance_end / wordSize);
3695
3696 assert(instance_size == align_object_size(align_size_up(
3697 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3698 wordSize) / wordSize), "consistent layout helper value");
3699
3700 // Invariant: nonstatic_field end/start should only change if there are
3701 // nonstatic fields in the class, or if the class is contended. We compare
3702 // against the non-aligned value, so that end alignment will not fail the
3703 // assert without actually having the fields.
3704 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3705 is_contended_class ||
3706 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3707
3708 // Number of non-static oop map blocks allocated at end of klass.
3709 const unsigned int total_oop_map_count =
3710 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3711 first_nonstatic_oop_offset);
3712
3713 #ifndef PRODUCT
3714 if (PrintFieldLayout) {
3715 print_field_layout(_class_name,
3716 _fields,
3717 _cp,
3718 instance_size,
3719 nonstatic_fields_start,
3720 nonstatic_fields_end,
3721 static_fields_end);
3722 }
3723
3724 #endif
3725 // Pass back information needed for InstanceKlass creation
3726 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3727 info->nonstatic_oop_counts = nonstatic_oop_counts;
3728 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3729 info->total_oop_map_count = total_oop_map_count;
3730 info->instance_size = instance_size;
3731 info->static_field_size = static_field_size;
3732 info->nonstatic_field_size = nonstatic_field_size;
3733 info->has_nonstatic_fields = has_nonstatic_fields;
3734 }
3735
3736
3737 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3738 ClassLoaderData* loader_data,
3739 Handle protection_domain,
3740 KlassHandle host_klass,
3741 GrowableArray<Handle>* cp_patches,
3742 TempNewSymbol& parsed_name,
3743 bool verify,
3744 TRAPS) {
3745
3746 // When a retransformable agent is attached, JVMTI caches the
3747 // class bytes that existed before the first retransformation.
3748 // If RedefineClasses() was used before the retransformable
3749 // agent attached, then the cached class bytes may not be the
3750 // original class bytes.
3751 JvmtiCachedClassFileData *cached_class_file = NULL;
3752 Handle class_loader(THREAD, loader_data->class_loader());
3753 bool has_default_methods = false;
3754 bool declares_default_methods = false;
3755 ResourceMark rm(THREAD);
3756
3757 ClassFileStream* cfs = stream();
3758 // Timing
3759 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3760 JavaThread* jt = (JavaThread*) THREAD;
3761
3762 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3763 ClassLoader::perf_class_parse_selftime(),
3764 NULL,
3765 jt->get_thread_stat()->perf_recursion_counts_addr(),
3766 jt->get_thread_stat()->perf_timers_addr(),
3767 PerfClassTraceTime::PARSE_CLASS);
3768
3769 init_parsed_class_attributes(loader_data);
3770
3771 if (JvmtiExport::should_post_class_file_load_hook()) {
3772 // Get the cached class file bytes (if any) from the class that
3773 // is being redefined or retransformed. We use jvmti_thread_state()
3774 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3775 // a JvmtiThreadState any earlier than necessary. This will help
3776 // avoid the bug described by 7126851.
3777 JvmtiThreadState *state = jt->jvmti_thread_state();
3778 if (state != NULL) {
3779 KlassHandle *h_class_being_redefined =
3780 state->get_class_being_redefined();
3781 if (h_class_being_redefined != NULL) {
3782 instanceKlassHandle ikh_class_being_redefined =
3783 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3784 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3785 }
3786 }
3787
3788 unsigned char* ptr = cfs->buffer();
3789 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3790
3791 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3792 &ptr, &end_ptr, &cached_class_file);
3793
3794 if (ptr != cfs->buffer()) {
3795 // JVMTI agent has modified class file data.
3796 // Set new class file stream using JVMTI agent modified
3797 // class file data.
3798 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3799 set_stream(cfs);
3800 }
3801 }
3802
3803 _host_klass = host_klass;
3804 _cp_patches = cp_patches;
3805
3806 instanceKlassHandle nullHandle;
3807
3808 // Figure out whether we can skip format checking (matching classic VM behavior)
3809 if (DumpSharedSpaces) {
3810 // verify == true means it's a 'remote' class (i.e., non-boot class)
3811 // Verification decision is based on BytecodeVerificationRemote flag
3812 // for those classes.
3813 _need_verify = (verify) ? BytecodeVerificationRemote :
3814 BytecodeVerificationLocal;
3815 } else {
3816 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3817 }
3818
3819 // Set the verify flag in stream
3820 cfs->set_verify(_need_verify);
3821
3822 // Save the class file name for easier error message printing.
3823 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3824
3825 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3826 // Magic value
3827 u4 magic = cfs->get_u4_fast();
3828 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3829 "Incompatible magic value %u in class file %s",
3830 magic, CHECK_(nullHandle));
3831
3832 // Version numbers
3833 u2 minor_version = cfs->get_u2_fast();
3834 u2 major_version = cfs->get_u2_fast();
3835
3836 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3837 ResourceMark rm;
3838 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3839 major_version, minor_version, name->as_C_string());
3840 Exceptions::fthrow(
3841 THREAD_AND_LOCATION,
3842 vmSymbols::java_lang_UnsupportedClassVersionError(),
3843 "Unsupported major.minor version for dump time %u.%u",
3844 major_version,
3845 minor_version);
3846 }
3847
3848 // Check version numbers - we check this even with verifier off
3849 if (!is_supported_version(major_version, minor_version)) {
3850 if (name == NULL) {
3851 Exceptions::fthrow(
3852 THREAD_AND_LOCATION,
3853 vmSymbols::java_lang_UnsupportedClassVersionError(),
3854 "Unsupported class file version %u.%u, "
3855 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3856 major_version,
3857 minor_version,
3858 JAVA_MAX_SUPPORTED_VERSION,
3859 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3860 } else {
3861 ResourceMark rm(THREAD);
3862 Exceptions::fthrow(
3863 THREAD_AND_LOCATION,
3864 vmSymbols::java_lang_UnsupportedClassVersionError(),
3865 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3866 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3867 name->as_C_string(),
3868 major_version,
3869 minor_version,
3870 JAVA_MAX_SUPPORTED_VERSION,
3871 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3872 }
3873 return nullHandle;
3874 }
3875
3876 _major_version = major_version;
3877 _minor_version = minor_version;
3878
3879
3880 // Check if verification needs to be relaxed for this class file
3881 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3882 _relax_verify = Verifier::relax_verify_for(class_loader());
3883
3884 // Constant pool
3885 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3886
3887 int cp_size = cp->length();
3888
3889 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3890
3891 // Access flags
3892 AccessFlags access_flags;
3893 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3894
3895 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3896 // Set abstract bit for old class files for backward compatibility
3897 flags |= JVM_ACC_ABSTRACT;
3898 }
3899 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3900 access_flags.set_flags(flags);
3901
3902 // This class and superclass
3903 u2 this_class_index = cfs->get_u2_fast();
3904 check_property(
3905 valid_cp_range(this_class_index, cp_size) &&
3906 cp->tag_at(this_class_index).is_unresolved_klass(),
3907 "Invalid this class index %u in constant pool in class file %s",
3908 this_class_index, CHECK_(nullHandle));
3909
3910 Symbol* class_name = cp->klass_name_at(this_class_index);
3911 assert(class_name != NULL, "class_name can't be null");
3912
3913 // It's important to set parsed_name *before* resolving the super class.
3914 // (it's used for cleanup by the caller if parsing fails)
3915 parsed_name = class_name;
3916 // parsed_name is returned and can be used if there's an error, so add to
3917 // its reference count. Caller will decrement the refcount.
3918 parsed_name->increment_refcount();
3919
3920 // Update _class_name which could be null previously to be class_name
3921 _class_name = class_name;
3922
3923 // Don't need to check whether this class name is legal or not.
3924 // It has been checked when constant pool is parsed.
3925 // However, make sure it is not an array type.
3926 if (_need_verify) {
3927 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3928 "Bad class name in class file %s",
3929 CHECK_(nullHandle));
3930 }
3931
3932 Klass* preserve_this_klass; // for storing result across HandleMark
3933
3934 // release all handles when parsing is done
3935 { HandleMark hm(THREAD);
3936
3937 // Checks if name in class file matches requested name
3938 if (name != NULL && class_name != name) {
3939 ResourceMark rm(THREAD);
3940 Exceptions::fthrow(
3941 THREAD_AND_LOCATION,
3942 vmSymbols::java_lang_NoClassDefFoundError(),
3943 "%s (wrong name: %s)",
3944 name->as_C_string(),
3945 class_name->as_C_string()
3946 );
3947 return nullHandle;
3948 }
3949
3950 if (TraceClassLoadingPreorder) {
3951 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3952 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3953 tty->print_cr("]");
3954 }
3955 #if INCLUDE_CDS
3956 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3957 // Only dump the classes that can be stored into CDS archive
3958 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3959 if (name != NULL) {
3960 ResourceMark rm(THREAD);
3961 classlist_file->print_cr("%s", name->as_C_string());
3962 classlist_file->flush();
3963 }
3964 }
3965 }
3966 #endif
3967
3968 u2 super_class_index = cfs->get_u2_fast();
3969 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3970 CHECK_NULL);
3971
3972 // Interfaces
3973 u2 itfs_len = cfs->get_u2_fast();
3974 Array<Klass*>* local_interfaces =
3975 parse_interfaces(itfs_len, protection_domain, _class_name,
3976 &has_default_methods, CHECK_(nullHandle));
3977
3978 u2 java_fields_count = 0;
3979 // Fields (offsets are filled in later)
3980 FieldAllocationCount fac;
3981 Array<u2>* fields = parse_fields(class_name,
3982 access_flags.is_interface(),
3983 &fac, &java_fields_count,
3984 CHECK_(nullHandle));
3985 // Methods
3986 bool has_final_method = false;
3987 AccessFlags promoted_flags;
3988 promoted_flags.set_flags(0);
3989 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3990 &promoted_flags,
3991 &has_final_method,
3992 &declares_default_methods,
3993 CHECK_(nullHandle));
3994
3995 if (declares_default_methods) {
3996 has_default_methods = true;
3997 }
3998
3999 // Additional attributes
4000 ClassAnnotationCollector parsed_annotations;
4001 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
4002
4003 // Finalize the Annotations metadata object,
4004 // now that all annotation arrays have been created.
4005 create_combined_annotations(CHECK_(nullHandle));
4006
4007 // Make sure this is the end of class file stream
4008 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
4009
4010 // We check super class after class file is parsed and format is checked
4011 if (super_class_index > 0 && super_klass.is_null()) {
4012 Symbol* sk = cp->klass_name_at(super_class_index);
4013 if (access_flags.is_interface()) {
4014 // Before attempting to resolve the superclass, check for class format
4015 // errors not checked yet.
4016 guarantee_property(sk == vmSymbols::java_lang_Object(),
4017 "Interfaces must have java.lang.Object as superclass in class file %s",
4018 CHECK_(nullHandle));
4019 }
4020 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4021 class_loader,
4022 protection_domain,
4023 true,
4024 CHECK_(nullHandle));
4025
4026 KlassHandle kh (THREAD, k);
4027 super_klass = instanceKlassHandle(THREAD, kh());
4028 }
4029 if (super_klass.not_null()) {
4030
4031 if (super_klass->has_default_methods()) {
4032 has_default_methods = true;
4033 }
4034
4035 if (super_klass->is_interface()) {
4036 ResourceMark rm(THREAD);
4037 Exceptions::fthrow(
4038 THREAD_AND_LOCATION,
4039 vmSymbols::java_lang_IncompatibleClassChangeError(),
4040 "class %s has interface %s as super class",
4041 class_name->as_klass_external_name(),
4042 super_klass->external_name()
4043 );
4044 return nullHandle;
4045 }
4046 // Make sure super class is not final
4047 if (super_klass->is_final()) {
4048 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4049 }
4050 }
4051
4052 // save super klass for error handling.
4053 _super_klass = super_klass;
4054
4055 // Compute the transitive list of all unique interfaces implemented by this class
4056 _transitive_interfaces =
4057 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4058
4059 // sort methods
4060 intArray* method_ordering = sort_methods(methods);
4061
4062 // promote flags from parse_methods() to the klass' flags
4063 access_flags.add_promoted_flags(promoted_flags.as_int());
4064
4065 // Size of Java vtable (in words)
4066 int vtable_size = 0;
4067 int itable_size = 0;
4068 int num_miranda_methods = 0;
4069
4070 GrowableArray<Method*> all_mirandas(20);
4071
4072 klassVtable::compute_vtable_size_and_num_mirandas(
4073 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4074 access_flags, class_loader, class_name, local_interfaces,
4075 CHECK_(nullHandle));
4076
4077 // Size of Java itable (in words)
4078 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4079
4080 FieldLayoutInfo info;
4081 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4082
4083 int total_oop_map_size2 =
4084 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4085
4086 // Compute reference type
4087 ReferenceType rt;
4088 if (super_klass() == NULL) {
4089 rt = REF_NONE;
4090 } else {
4091 rt = super_klass->reference_type();
4092 }
4093
4094 // We can now create the basic Klass* for this klass
4095 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4096 vtable_size,
4097 itable_size,
4098 info.static_field_size,
4099 total_oop_map_size2,
4100 rt,
4101 access_flags,
4102 name,
4103 super_klass(),
4104 !host_klass.is_null(),
4105 CHECK_(nullHandle));
4106 instanceKlassHandle this_klass (THREAD, _klass);
4107
4108 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4109 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4110 "sanity");
4111
4112 // Fill in information already parsed
4113 this_klass->set_should_verify_class(verify);
4114 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4115 this_klass->set_layout_helper(lh);
4116 assert(this_klass->is_instance_klass(), "layout is correct");
4117 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4118 // Not yet: supers are done below to support the new subtype-checking fields
4119 //this_klass->set_super(super_klass());
4120 this_klass->set_class_loader_data(loader_data);
4121 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4122 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4123 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4124
4125 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4126
4127 if (has_final_method) {
4128 this_klass->set_has_final_method();
4129 }
4130 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4131 // The InstanceKlass::_methods_jmethod_ids cache
4132 // is managed on the assumption that the initial cache
4133 // size is equal to the number of methods in the class. If
4134 // that changes, then InstanceKlass::idnum_can_increment()
4135 // has to be changed accordingly.
4136 this_klass->set_initial_method_idnum(methods->length());
4137 this_klass->set_name(cp->klass_name_at(this_class_index));
4138 if (is_anonymous()) // I am well known to myself
4139 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4140
4141 this_klass->set_minor_version(minor_version);
4142 this_klass->set_major_version(major_version);
4143 this_klass->set_has_default_methods(has_default_methods);
4144 this_klass->set_declares_default_methods(declares_default_methods);
4145
4146 if (!host_klass.is_null()) {
4147 assert (this_klass->is_anonymous(), "should be the same");
4148 this_klass->set_host_klass(host_klass());
4149 }
4150
4151 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4152 // (We used to do this lazily, but now we query it in Rewriter,
4153 // which is eagerly done for every method, so we might as well do it now,
4154 // when everything is fresh in memory.)
4155 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4156 if (klass_id != vmSymbols::NO_SID) {
4157 for (int j = 0; j < methods->length(); j++) {
4158 Method* method = methods->at(j);
4159 method->init_intrinsic_id();
4160
4161 if (CheckIntrinsics) {
4162 // Check if an intrinsic is defined for method 'method',
4163 // but the method is not annotated with @HotSpotIntrinsicCandidate.
4164 if (method->intrinsic_id() != vmIntrinsics::_none &&
4165 !method->intrinsic_candidate()) {
4166 tty->print("Compiler intrinsic is defined for method [%s], "
4167 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4168 method->name_and_sig_as_C_string(),
4169 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4170 );
4171 tty->cr();
4172 DEBUG_ONLY(vm_exit(1));
4173 }
4174 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4175 // but there is no intrinsic available for it.
4176 if (method->intrinsic_candidate() &&
4177 method->intrinsic_id() == vmIntrinsics::_none) {
4178 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4179 "but no compiler intrinsic is defined for the method.%s",
4180 method->name_and_sig_as_C_string(),
4181 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4182 );
4183 tty->cr();
4184 DEBUG_ONLY(vm_exit(1));
4185 }
4186 }
4187 }
4188
4189 #ifdef ASSERT
4190 if (CheckIntrinsics) {
4191 // Check for orphan methods in the current class. A method m
4192 // of a class C is orphan if an intrinsic is defined for method m,
4193 // but class C does not declare m.
4194 // The check is potentially expensive, therefore it is available
4195 // only in debug builds.
4196
4197 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4198 if (id == vmIntrinsics::_compiledLambdaForm) {
4199 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4200 // generated for the JVM from a LambdaForm and therefore no method
4201 // is defined for it.
4202 continue;
4203 }
4204
4205 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4206 // Check if the current class contains a method with the same
4207 // name, flags, signature.
4208 bool match = false;
4209 for (int j = 0; j < methods->length(); j++) {
4210 Method* method = methods->at(j);
4211 if (id == method->intrinsic_id()) {
4212 match = true;
4213 break;
4214 }
4215 }
4216
4217 if (!match) {
4218 char buf[1000];
4219 tty->print("Compiler intrinsic is defined for method [%s], "
4220 "but the method is not available in class [%s].%s",
4221 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4222 this_klass->name()->as_C_string(),
4223 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4224 );
4225 tty->cr();
4226 DEBUG_ONLY(vm_exit(1));
4227 }
4228 }
4229 }
4230 }
4231 #endif // ASSERT
4232 }
4233
4234
4235 if (cached_class_file != NULL) {
4236 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4237 this_klass->set_cached_class_file(cached_class_file);
4238 }
4239
4240 // Fill in field values obtained by parse_classfile_attributes
4241 if (parsed_annotations.has_any_annotations())
4242 parsed_annotations.apply_to(this_klass);
4243 apply_parsed_class_attributes(this_klass);
4244
4245 // Miranda methods
4246 if ((num_miranda_methods > 0) ||
4247 // if this class introduced new miranda methods or
4248 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4249 // super class exists and this class inherited miranda methods
4250 ) {
4251 this_klass->set_has_miranda_methods(); // then set a flag
4252 }
4253
4254 // Fill in information needed to compute superclasses.
4255 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4256
4257 // Initialize itable offset tables
4258 klassItable::setup_itable_offset_table(this_klass);
4259
4260 // Compute transitive closure of interfaces this class implements
4261 // Do final class setup
4262 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4263
4264 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4265 set_precomputed_flags(this_klass);
4266
4267 // reinitialize modifiers, using the InnerClasses attribute
4268 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4269 this_klass->set_modifier_flags(computed_modifiers);
4270
4271 // check if this class can access its super class
4272 check_super_class_access(this_klass, CHECK_(nullHandle));
4273
4274 // check if this class can access its superinterfaces
4275 check_super_interface_access(this_klass, CHECK_(nullHandle));
4276
4277 // check if this class overrides any final method
4278 check_final_method_override(this_klass, CHECK_(nullHandle));
4279
4280 // check that if this class is an interface then it doesn't have static methods
4281 if (this_klass->is_interface()) {
4282 /* An interface in a JAVA 8 classfile can be static */
4283 if (_major_version < JAVA_8_VERSION) {
4284 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4285 }
4286 }
4287
4288 // Allocate mirror and initialize static fields
4289 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4290 CHECK_(nullHandle));
4291
4292 // Generate any default methods - default methods are interface methods
4293 // that have a default implementation. This is new with Lambda project.
4294 if (has_default_methods ) {
4295 DefaultMethods::generate_default_methods(
4296 this_klass(), &all_mirandas, CHECK_(nullHandle));
4297 }
4298
4299 // Update the loader_data graph.
4300 record_defined_class_dependencies(this_klass, CHECK_NULL);
4301
4302 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4303 false /* not shared class */);
4304
4305 if (TraceClassLoading) {
4306 ResourceMark rm;
4307 // print in a single call to reduce interleaving of output
4308 if (cfs->source() != NULL) {
4309 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4310 cfs->source());
4311 } else if (class_loader.is_null()) {
4312 Klass* caller =
4313 THREAD->is_Java_thread()
4314 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4315 : NULL;
4316 // caller can be NULL, for example, during a JVMTI VM_Init hook
4317 if (caller != NULL) {
4318 tty->print("[Loaded %s by instance of %s]\n",
4319 this_klass->external_name(),
4320 caller->external_name());
4321 } else {
4322 tty->print("[Loaded %s]\n", this_klass->external_name());
4323 }
4324 } else {
4325 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4326 class_loader->klass()->external_name());
4327 }
4328 }
4329
4330 if (TraceClassResolution) {
4331 ResourceMark rm;
4332 // print out the superclass.
4333 const char * from = this_klass()->external_name();
4334 if (this_klass->java_super() != NULL) {
4335 tty->print("RESOLVE %s %s (super)\n", from, this_klass->java_super()->external_name());
4336 }
4337 // print out each of the interface classes referred to by this class.
4338 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4339 if (local_interfaces != NULL) {
4340 int length = local_interfaces->length();
4341 for (int i = 0; i < length; i++) {
4342 Klass* k = local_interfaces->at(i);
4343 const char * to = k->external_name();
4344 tty->print("RESOLVE %s %s (interface)\n", from, to);
4345 }
4346 }
4347 }
4348
4349 // preserve result across HandleMark
4350 preserve_this_klass = this_klass();
4351 }
4352
4353 // Create new handle outside HandleMark (might be needed for
4354 // Extended Class Redefinition)
4355 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4356 debug_only(this_klass->verify();)
4357
4358 // Clear class if no error has occurred so destructor doesn't deallocate it
4359 _klass = NULL;
4360 return this_klass;
4361 }
4362
4363 // Destructor to clean up if there's an error
4364 ClassFileParser::~ClassFileParser() {
4365 MetadataFactory::free_metadata(_loader_data, _cp);
4366 MetadataFactory::free_array<u2>(_loader_data, _fields);
4367
4368 // Free methods
4369 InstanceKlass::deallocate_methods(_loader_data, _methods);
4370
4371 // beware of the Universe::empty_blah_array!!
4372 if (_inner_classes != Universe::the_empty_short_array()) {
4373 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4374 }
4375
4376 // Free interfaces
4377 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4378 _local_interfaces, _transitive_interfaces);
4379
4380 if (_combined_annotations != NULL) {
4381 // After all annotations arrays have been created, they are installed into the
4382 // Annotations object that will be assigned to the InstanceKlass being created.
4383
4384 // Deallocate the Annotations object and the installed annotations arrays.
4385 _combined_annotations->deallocate_contents(_loader_data);
4386
4387 // If the _combined_annotations pointer is non-NULL,
4388 // then the other annotations fields should have been cleared.
4389 assert(_annotations == NULL, "Should have been cleared");
4390 assert(_type_annotations == NULL, "Should have been cleared");
4391 assert(_fields_annotations == NULL, "Should have been cleared");
4392 assert(_fields_type_annotations == NULL, "Should have been cleared");
4393 } else {
4394 // If the annotations arrays were not installed into the Annotations object,
4395 // then they have to be deallocated explicitly.
4396 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4397 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4398 Annotations::free_contents(_loader_data, _fields_annotations);
4399 Annotations::free_contents(_loader_data, _fields_type_annotations);
4400 }
4401
4402 clear_class_metadata();
4403
4404 // deallocate the klass if already created. Don't directly deallocate, but add
4405 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4406 // at a safepoint.
4407 if (_klass != NULL) {
4408 _loader_data->add_to_deallocate_list(_klass);
4409 }
4410 _klass = NULL;
4411 }
4412
4413 void ClassFileParser::print_field_layout(Symbol* name,
4414 Array<u2>* fields,
4415 const constantPoolHandle& cp,
4416 int instance_size,
4417 int instance_fields_start,
4418 int instance_fields_end,
4419 int static_fields_end) {
4420 tty->print("%s: field layout\n", name->as_klass_external_name());
4421 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4422 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4423 if (!fs.access_flags().is_static()) {
4424 tty->print(" @%3d \"%s\" %s\n",
4425 fs.offset(),
4426 fs.name()->as_klass_external_name(),
4427 fs.signature()->as_klass_external_name());
4428 }
4429 }
4430 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4431 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4432 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4433 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4434 if (fs.access_flags().is_static()) {
4435 tty->print(" @%3d \"%s\" %s\n",
4436 fs.offset(),
4437 fs.name()->as_klass_external_name(),
4438 fs.signature()->as_klass_external_name());
4439 }
4440 }
4441 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4442 tty->print("\n");
4443 }
4444
4445 unsigned int
4446 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4447 unsigned int nonstatic_oop_map_count,
4448 int first_nonstatic_oop_offset) {
4449 unsigned int map_count =
4450 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4451 if (nonstatic_oop_map_count > 0) {
4452 // We have oops to add to map
4453 if (map_count == 0) {
4454 map_count = nonstatic_oop_map_count;
4455 } else {
4456 // Check whether we should add a new map block or whether the last one can
4457 // be extended
4458 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4459 OopMapBlock* const last_map = first_map + map_count - 1;
4460
4461 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4462 if (next_offset == first_nonstatic_oop_offset) {
4463 // There is no gap bettwen superklass's last oop field and first
4464 // local oop field, merge maps.
4465 nonstatic_oop_map_count -= 1;
4466 } else {
4467 // Superklass didn't end with a oop field, add extra maps
4468 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4469 }
4470 map_count += nonstatic_oop_map_count;
4471 }
4472 }
4473 return map_count;
4474 }
4475
4476
4477 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4478 unsigned int nonstatic_oop_map_count,
4479 int* nonstatic_oop_offsets,
4480 unsigned int* nonstatic_oop_counts) {
4481 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4482 const InstanceKlass* const super = k->superklass();
4483 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4484 if (super_count > 0) {
4485 // Copy maps from superklass
4486 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4487 for (unsigned int i = 0; i < super_count; ++i) {
4488 *this_oop_map++ = *super_oop_map++;
4489 }
4490 }
4491
4492 if (nonstatic_oop_map_count > 0) {
4493 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4494 // The counts differ because there is no gap between superklass's last oop
4495 // field and the first local oop field. Extend the last oop map copied
4496 // from the superklass instead of creating new one.
4497 nonstatic_oop_map_count--;
4498 nonstatic_oop_offsets++;
4499 this_oop_map--;
4500 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4501 this_oop_map++;
4502 }
4503
4504 // Add new map blocks, fill them
4505 while (nonstatic_oop_map_count-- > 0) {
4506 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4507 this_oop_map->set_count(*nonstatic_oop_counts++);
4508 this_oop_map++;
4509 }
4510 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4511 this_oop_map, "sanity");
4512 }
4513 }
4514
4515
4516 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4517 Klass* super = k->super();
4518
4519 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4520 // in which case we don't have to register objects as finalizable
4521 if (!_has_empty_finalizer) {
4522 if (_has_finalizer ||
4523 (super != NULL && super->has_finalizer())) {
4524 k->set_has_finalizer();
4525 }
4526 }
4527
4528 #ifdef ASSERT
4529 bool f = false;
4530 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4531 vmSymbols::void_method_signature());
4532 if (m != NULL && !m->is_empty_method()) {
4533 f = true;
4534 }
4535
4536 // Spec doesn't prevent agent from redefinition of empty finalizer.
4537 // Despite the fact that it's generally bad idea and redefined finalizer
4538 // will not work as expected we shouldn't abort vm in this case
4539 if (!k->has_redefined_this_or_super()) {
4540 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4541 }
4542 #endif
4543
4544 // Check if this klass supports the java.lang.Cloneable interface
4545 if (SystemDictionary::Cloneable_klass_loaded()) {
4546 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4547 k->set_is_cloneable();
4548 }
4549 }
4550
4551 // Check if this klass has a vanilla default constructor
4552 if (super == NULL) {
4553 // java.lang.Object has empty default constructor
4554 k->set_has_vanilla_constructor();
4555 } else {
4556 if (super->has_vanilla_constructor() &&
4557 _has_vanilla_constructor) {
4558 k->set_has_vanilla_constructor();
4559 }
4560 #ifdef ASSERT
4561 bool v = false;
4562 if (super->has_vanilla_constructor()) {
4563 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4564 ), vmSymbols::void_method_signature());
4565 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4566 v = true;
4567 }
4568 }
4569 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4570 #endif
4571 }
4572
4573 // If it cannot be fast-path allocated, set a bit in the layout helper.
4574 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4575 assert(k->size_helper() > 0, "layout_helper is initialized");
4576 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4577 || k->is_abstract() || k->is_interface()
4578 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4579 || k->size_helper() >= FastAllocateSizeLimit) {
4580 // Forbid fast-path allocation.
4581 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4582 k->set_layout_helper(lh);
4583 }
4584 }
4585
4586 // Attach super classes and interface classes to class loader data
4587 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4588 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4589 if (defining_loader_data->is_the_null_class_loader_data()) {
4590 // Dependencies to null class loader data are implicit.
4591 return;
4592 } else {
4593 // add super class dependency
4594 Klass* super = defined_klass->super();
4595 if (super != NULL) {
4596 defining_loader_data->record_dependency(super, CHECK);
4597 }
4598
4599 // add super interface dependencies
4600 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4601 if (local_interfaces != NULL) {
4602 int length = local_interfaces->length();
4603 for (int i = 0; i < length; i++) {
4604 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4605 }
4606 }
4607 }
4608 }
4609
4610 // utility methods for appending an array with check for duplicates
4611
4612 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4613 // iterate over new interfaces
4614 for (int i = 0; i < ifs->length(); i++) {
4615 Klass* e = ifs->at(i);
4616 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4617 // add new interface
4618 result->append_if_missing(e);
4619 }
4620 }
4621
4622 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4623 instanceKlassHandle super,
4624 Array<Klass*>* local_ifs, TRAPS) {
4625 // Compute maximum size for transitive interfaces
4626 int max_transitive_size = 0;
4627 int super_size = 0;
4628 // Add superclass transitive interfaces size
4629 if (super.not_null()) {
4630 super_size = super->transitive_interfaces()->length();
4631 max_transitive_size += super_size;
4632 }
4633 // Add local interfaces' super interfaces
4634 int local_size = local_ifs->length();
4635 for (int i = 0; i < local_size; i++) {
4636 Klass* l = local_ifs->at(i);
4637 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4638 }
4639 // Finally add local interfaces
4640 max_transitive_size += local_size;
4641 // Construct array
4642 if (max_transitive_size == 0) {
4643 // no interfaces, use canonicalized array
4644 return Universe::the_empty_klass_array();
4645 } else if (max_transitive_size == super_size) {
4646 // no new local interfaces added, share superklass' transitive interface array
4647 return super->transitive_interfaces();
4648 } else if (max_transitive_size == local_size) {
4649 // only local interfaces added, share local interface array
4650 return local_ifs;
4651 } else {
4652 ResourceMark rm;
4653 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4654
4655 // Copy down from superclass
4656 if (super.not_null()) {
4657 append_interfaces(result, super->transitive_interfaces());
4658 }
4659
4660 // Copy down from local interfaces' superinterfaces
4661 for (int i = 0; i < local_ifs->length(); i++) {
4662 Klass* l = local_ifs->at(i);
4663 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4664 }
4665 // Finally add local interfaces
4666 append_interfaces(result, local_ifs);
4667
4668 // length will be less than the max_transitive_size if duplicates were removed
4669 int length = result->length();
4670 assert(length <= max_transitive_size, "just checking");
4671 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4672 for (int i = 0; i < length; i++) {
4673 Klass* e = result->at(i);
4674 assert(e != NULL, "just checking");
4675 new_result->at_put(i, e);
4676 }
4677 return new_result;
4678 }
4679 }
4680
4681 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4682 Klass* super = this_klass->super();
4683 if ((super != NULL) &&
4684 (!Reflection::verify_class_access(this_klass(), super, false))) {
4685 ResourceMark rm(THREAD);
4686 Exceptions::fthrow(
4687 THREAD_AND_LOCATION,
4688 vmSymbols::java_lang_IllegalAccessError(),
4689 "class %s cannot access its superclass %s",
4690 this_klass->external_name(),
4691 super->external_name()
4692 );
4693 return;
4694 }
4695 }
4696
4697
4698 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4699 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4700 int lng = local_interfaces->length();
4701 for (int i = lng - 1; i >= 0; i--) {
4702 Klass* k = local_interfaces->at(i);
4703 assert (k != NULL && k->is_interface(), "invalid interface");
4704 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4705 ResourceMark rm(THREAD);
4706 Exceptions::fthrow(
4707 THREAD_AND_LOCATION,
4708 vmSymbols::java_lang_IllegalAccessError(),
4709 "class %s cannot access its superinterface %s",
4710 this_klass->external_name(),
4711 k->external_name()
4712 );
4713 return;
4714 }
4715 }
4716 }
4717
4718
4719 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4720 Array<Method*>* methods = this_klass->methods();
4721 int num_methods = methods->length();
4722
4723 // go thru each method and check if it overrides a final method
4724 for (int index = 0; index < num_methods; index++) {
4725 Method* m = methods->at(index);
4726
4727 // skip private, static, and <init> methods
4728 if ((!m->is_private() && !m->is_static()) &&
4729 (m->name() != vmSymbols::object_initializer_name())) {
4730
4731 Symbol* name = m->name();
4732 Symbol* signature = m->signature();
4733 Klass* k = this_klass->super();
4734 Method* super_m = NULL;
4735 while (k != NULL) {
4736 // skip supers that don't have final methods.
4737 if (k->has_final_method()) {
4738 // lookup a matching method in the super class hierarchy
4739 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4740 if (super_m == NULL) {
4741 break; // didn't find any match; get out
4742 }
4743
4744 if (super_m->is_final() && !super_m->is_static() &&
4745 // matching method in super is final, and not static
4746 (Reflection::verify_field_access(this_klass(),
4747 super_m->method_holder(),
4748 super_m->method_holder(),
4749 super_m->access_flags(), false))
4750 // this class can access super final method and therefore override
4751 ) {
4752 ResourceMark rm(THREAD);
4753 Exceptions::fthrow(
4754 THREAD_AND_LOCATION,
4755 vmSymbols::java_lang_VerifyError(),
4756 "class %s overrides final method %s.%s%s",
4757 this_klass->external_name(),
4758 super_m->method_holder()->external_name(),
4759 name->as_C_string(),
4760 signature->as_C_string()
4761 );
4762 return;
4763 }
4764
4765 // continue to look from super_m's holder's super.
4766 k = super_m->method_holder()->super();
4767 continue;
4768 }
4769
4770 k = k->super();
4771 }
4772 }
4773 }
4774 }
4775
4776
4777 // assumes that this_klass is an interface
4778 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4779 assert(this_klass->is_interface(), "not an interface");
4780 Array<Method*>* methods = this_klass->methods();
4781 int num_methods = methods->length();
4782
4783 for (int index = 0; index < num_methods; index++) {
4784 Method* m = methods->at(index);
4785 // if m is static and not the init method, throw a verify error
4786 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4787 ResourceMark rm(THREAD);
4788 Exceptions::fthrow(
4789 THREAD_AND_LOCATION,
4790 vmSymbols::java_lang_VerifyError(),
4791 "Illegal static method %s in interface %s",
4792 m->name()->as_C_string(),
4793 this_klass->external_name()
4794 );
4795 return;
4796 }
4797 }
4798 }
4799
4800 // utility methods for format checking
4801
4802 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4803 if (!_need_verify) { return; }
4804
4805 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4806 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4807 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4808 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4809 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4810 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4811 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4812
4813 if ((is_abstract && is_final) ||
4814 (is_interface && !is_abstract) ||
4815 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4816 (!is_interface && major_gte_15 && is_annotation)) {
4817 ResourceMark rm(THREAD);
4818 Exceptions::fthrow(
4819 THREAD_AND_LOCATION,
4820 vmSymbols::java_lang_ClassFormatError(),
4821 "Illegal class modifiers in class %s: 0x%X",
4822 _class_name->as_C_string(), flags
4823 );
4824 return;
4825 }
4826 }
4827
4828 bool ClassFileParser::has_illegal_visibility(jint flags) {
4829 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4830 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4831 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4832
4833 return ((is_public && is_protected) ||
4834 (is_public && is_private) ||
4835 (is_protected && is_private));
4836 }
4837
4838 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4839 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4840 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4841 (major <= max_version) &&
4842 ((major != max_version) ||
4843 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4844 }
4845
4846 void ClassFileParser::verify_legal_field_modifiers(
4847 jint flags, bool is_interface, TRAPS) {
4848 if (!_need_verify) { return; }
4849
4850 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4851 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4852 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4853 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4854 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4855 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4856 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4857 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4858 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4859
4860 bool is_illegal = false;
4861
4862 if (is_interface) {
4863 if (!is_public || !is_static || !is_final || is_private ||
4864 is_protected || is_volatile || is_transient ||
4865 (major_gte_15 && is_enum)) {
4866 is_illegal = true;
4867 }
4868 } else { // not interface
4869 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4870 is_illegal = true;
4871 }
4872 }
4873
4874 if (is_illegal) {
4875 ResourceMark rm(THREAD);
4876 Exceptions::fthrow(
4877 THREAD_AND_LOCATION,
4878 vmSymbols::java_lang_ClassFormatError(),
4879 "Illegal field modifiers in class %s: 0x%X",
4880 _class_name->as_C_string(), flags);
4881 return;
4882 }
4883 }
4884
4885 void ClassFileParser::verify_legal_method_modifiers(
4886 jint flags, bool is_interface, Symbol* name, TRAPS) {
4887 if (!_need_verify) { return; }
4888
4889 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4890 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4891 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4892 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4893 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4894 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4895 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4896 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4897 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4898 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4899 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4900 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4901 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4902
4903 bool is_illegal = false;
4904
4905 if (is_interface) {
4906 if (major_gte_8) {
4907 // Class file version is JAVA_8_VERSION or later Methods of
4908 // interfaces may set any of the flags except ACC_PROTECTED,
4909 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4910 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4911 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4912 (is_native || is_protected || is_final || is_synchronized) ||
4913 // If a specific method of a class or interface has its
4914 // ACC_ABSTRACT flag set, it must not have any of its
4915 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4916 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4917 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4918 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4919 (is_abstract && (is_private || is_static || is_strict))) {
4920 is_illegal = true;
4921 }
4922 } else if (major_gte_15) {
4923 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4924 if (!is_public || is_static || is_final || is_synchronized ||
4925 is_native || !is_abstract || is_strict) {
4926 is_illegal = true;
4927 }
4928 } else {
4929 // Class file version is pre-JAVA_1_5_VERSION
4930 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4931 is_illegal = true;
4932 }
4933 }
4934 } else { // not interface
4935 if (has_illegal_visibility(flags)) {
4936 is_illegal = true;
4937 } else {
4938 if (is_initializer) {
4939 if (is_static || is_final || is_synchronized || is_native ||
4940 is_abstract || (major_gte_15 && is_bridge)) {
4941 is_illegal = true;
4942 }
4943 } else { // not initializer
4944 if (is_abstract) {
4945 if ((is_final || is_native || is_private || is_static ||
4946 (major_gte_15 && (is_synchronized || is_strict)))) {
4947 is_illegal = true;
4948 }
4949 }
4950 }
4951 }
4952 }
4953
4954 if (is_illegal) {
4955 ResourceMark rm(THREAD);
4956 Exceptions::fthrow(
4957 THREAD_AND_LOCATION,
4958 vmSymbols::java_lang_ClassFormatError(),
4959 "Method %s in class %s has illegal modifiers: 0x%X",
4960 name->as_C_string(), _class_name->as_C_string(), flags);
4961 return;
4962 }
4963 }
4964
4965 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4966 assert(_need_verify, "only called when _need_verify is true");
4967 int i = 0;
4968 int count = length >> 2;
4969 for (int k=0; k<count; k++) {
4970 unsigned char b0 = buffer[i];
4971 unsigned char b1 = buffer[i+1];
4972 unsigned char b2 = buffer[i+2];
4973 unsigned char b3 = buffer[i+3];
4974 // For an unsigned char v,
4975 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4976 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4977 unsigned char res = b0 | b0 - 1 |
4978 b1 | b1 - 1 |
4979 b2 | b2 - 1 |
4980 b3 | b3 - 1;
4981 if (res >= 128) break;
4982 i += 4;
4983 }
4984 for(; i < length; i++) {
4985 unsigned short c;
4986 // no embedded zeros
4987 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4988 if(buffer[i] < 128) {
4989 continue;
4990 }
4991 if ((i + 5) < length) { // see if it's legal supplementary character
4992 if (UTF8::is_supplementary_character(&buffer[i])) {
4993 c = UTF8::get_supplementary_character(&buffer[i]);
4994 i += 5;
4995 continue;
4996 }
4997 }
4998 switch (buffer[i] >> 4) {
4999 default: break;
5000 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
5001 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5002 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
5003 c = (buffer[i] & 0x1F) << 6;
5004 i++;
5005 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
5006 c += buffer[i] & 0x3F;
5007 if (_major_version <= 47 || c == 0 || c >= 0x80) {
5008 // for classes with major > 47, c must a null or a character in its shortest form
5009 break;
5010 }
5011 }
5012 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5013 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
5014 c = (buffer[i] & 0xF) << 12;
5015 i += 2;
5016 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5017 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5018 if (_major_version <= 47 || c >= 0x800) {
5019 // for classes with major > 47, c must be in its shortest form
5020 break;
5021 }
5022 }
5023 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5024 } // end of switch
5025 } // end of for
5026 }
5027
5028 // Checks if name is a legal class name.
5029 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5030 if (!_need_verify || _relax_verify) { return; }
5031
5032 char buf[fixed_buffer_size];
5033 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5034 unsigned int length = name->utf8_length();
5035 bool legal = false;
5036
5037 if (length > 0) {
5038 char* p;
5039 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5040 p = skip_over_field_signature(bytes, false, length, CHECK);
5041 legal = (p != NULL) && ((p - bytes) == (int)length);
5042 } else if (_major_version < JAVA_1_5_VERSION) {
5043 if (bytes[0] != '<') {
5044 p = skip_over_field_name(bytes, true, length);
5045 legal = (p != NULL) && ((p - bytes) == (int)length);
5046 }
5047 } else {
5048 // 4900761: relax the constraints based on JSR202 spec
5049 // Class names may be drawn from the entire Unicode character set.
5050 // Identifiers between '/' must be unqualified names.
5051 // The utf8 string has been verified when parsing cpool entries.
5052 legal = verify_unqualified_name(bytes, length, LegalClass);
5053 }
5054 }
5055 if (!legal) {
5056 ResourceMark rm(THREAD);
5057 Exceptions::fthrow(
5058 THREAD_AND_LOCATION,
5059 vmSymbols::java_lang_ClassFormatError(),
5060 "Illegal class name \"%s\" in class file %s", bytes,
5061 _class_name->as_C_string()
5062 );
5063 return;
5064 }
5065 }
5066
5067 // Checks if name is a legal field name.
5068 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5069 if (!_need_verify || _relax_verify) { return; }
5070
5071 char buf[fixed_buffer_size];
5072 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5073 unsigned int length = name->utf8_length();
5074 bool legal = false;
5075
5076 if (length > 0) {
5077 if (_major_version < JAVA_1_5_VERSION) {
5078 if (bytes[0] != '<') {
5079 char* p = skip_over_field_name(bytes, false, length);
5080 legal = (p != NULL) && ((p - bytes) == (int)length);
5081 }
5082 } else {
5083 // 4881221: relax the constraints based on JSR202 spec
5084 legal = verify_unqualified_name(bytes, length, LegalField);
5085 }
5086 }
5087
5088 if (!legal) {
5089 ResourceMark rm(THREAD);
5090 Exceptions::fthrow(
5091 THREAD_AND_LOCATION,
5092 vmSymbols::java_lang_ClassFormatError(),
5093 "Illegal field name \"%s\" in class %s", bytes,
5094 _class_name->as_C_string()
5095 );
5096 return;
5097 }
5098 }
5099
5100 // Checks if name is a legal method name.
5101 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5102 if (!_need_verify || _relax_verify) { return; }
5103
5104 assert(name != NULL, "method name is null");
5105 char buf[fixed_buffer_size];
5106 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5107 unsigned int length = name->utf8_length();
5108 bool legal = false;
5109
5110 if (length > 0) {
5111 if (bytes[0] == '<') {
5112 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5113 legal = true;
5114 }
5115 } else if (_major_version < JAVA_1_5_VERSION) {
5116 char* p;
5117 p = skip_over_field_name(bytes, false, length);
5118 legal = (p != NULL) && ((p - bytes) == (int)length);
5119 } else {
5120 // 4881221: relax the constraints based on JSR202 spec
5121 legal = verify_unqualified_name(bytes, length, LegalMethod);
5122 }
5123 }
5124
5125 if (!legal) {
5126 ResourceMark rm(THREAD);
5127 Exceptions::fthrow(
5128 THREAD_AND_LOCATION,
5129 vmSymbols::java_lang_ClassFormatError(),
5130 "Illegal method name \"%s\" in class %s", bytes,
5131 _class_name->as_C_string()
5132 );
5133 return;
5134 }
5135 }
5136
5137
5138 // Checks if signature is a legal field signature.
5139 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5140 if (!_need_verify) { return; }
5141
5142 char buf[fixed_buffer_size];
5143 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5144 unsigned int length = signature->utf8_length();
5145 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5146
5147 if (p == NULL || (p - bytes) != (int)length) {
5148 throwIllegalSignature("Field", name, signature, CHECK);
5149 }
5150 }
5151
5152 // Checks if signature is a legal method signature.
5153 // Returns number of parameters
5154 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5155 if (!_need_verify) {
5156 // make sure caller's args_size will be less than 0 even for non-static
5157 // method so it will be recomputed in compute_size_of_parameters().
5158 return -2;
5159 }
5160
5161 // Class initializers cannot have args for class format version >= 51.
5162 if (name == vmSymbols::class_initializer_name() &&
5163 signature != vmSymbols::void_method_signature() &&
5164 _major_version >= JAVA_7_VERSION) {
5165 throwIllegalSignature("Method", name, signature, CHECK_0);
5166 return 0;
5167 }
5168
5169 unsigned int args_size = 0;
5170 char buf[fixed_buffer_size];
5171 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5172 unsigned int length = signature->utf8_length();
5173 char* nextp;
5174
5175 // The first character must be a '('
5176 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5177 length--;
5178 // Skip over legal field signatures
5179 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5180 while ((length > 0) && (nextp != NULL)) {
5181 args_size++;
5182 if (p[0] == 'J' || p[0] == 'D') {
5183 args_size++;
5184 }
5185 length -= nextp - p;
5186 p = nextp;
5187 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5188 }
5189 // The first non-signature thing better be a ')'
5190 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5191 length--;
5192 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5193 // All internal methods must return void
5194 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5195 return args_size;
5196 }
5197 } else {
5198 // Now we better just have a return value
5199 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5200 if (nextp && ((int)length == (nextp - p))) {
5201 return args_size;
5202 }
5203 }
5204 }
5205 }
5206 // Report error
5207 throwIllegalSignature("Method", name, signature, CHECK_0);
5208 return 0;
5209 }
5210
5211
5212 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5213 // Method names also may not contain the characters '<' or '>', unless <init>
5214 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5215 // method. Because these names have been checked as special cases before
5216 // calling this method in verify_legal_method_name.
5217 bool ClassFileParser::verify_unqualified_name(
5218 char* name, unsigned int length, int type) {
5219 jchar ch;
5220
5221 for (char* p = name; p != name + length; ) {
5222 ch = *p;
5223 if (ch < 128) {
5224 p++;
5225 if (ch == '.' || ch == ';' || ch == '[' ) {
5226 return false; // do not permit '.', ';', or '['
5227 }
5228 if (type != LegalClass && ch == '/') {
5229 return false; // do not permit '/' unless it's class name
5230 }
5231 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5232 return false; // do not permit '<' or '>' in method names
5233 }
5234 } else {
5235 char* tmp_p = UTF8::next(p, &ch);
5236 p = tmp_p;
5237 }
5238 }
5239 return true;
5240 }
5241
5242
5243 // Take pointer to a string. Skip over the longest part of the string that could
5244 // be taken as a fieldname. Allow '/' if slash_ok is true.
5245 // Return a pointer to just past the fieldname.
5246 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5247 // being true, we saw consecutive slashes (meaning we were looking for a
5248 // qualified path but found something that was badly-formed).
5249 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5250 char* p;
5251 jchar ch;
5252 jboolean last_is_slash = false;
5253 jboolean not_first_ch = false;
5254
5255 for (p = name; p != name + length; not_first_ch = true) {
5256 char* old_p = p;
5257 ch = *p;
5258 if (ch < 128) {
5259 p++;
5260 // quick check for ascii
5261 if ((ch >= 'a' && ch <= 'z') ||
5262 (ch >= 'A' && ch <= 'Z') ||
5263 (ch == '_' || ch == '$') ||
5264 (not_first_ch && ch >= '0' && ch <= '9')) {
5265 last_is_slash = false;
5266 continue;
5267 }
5268 if (slash_ok && ch == '/') {
5269 if (last_is_slash) {
5270 return NULL; // Don't permit consecutive slashes
5271 }
5272 last_is_slash = true;
5273 continue;
5274 }
5275 } else {
5276 jint unicode_ch;
5277 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5278 p = tmp_p;
5279 last_is_slash = false;
5280 // Check if ch is Java identifier start or is Java identifier part
5281 // 4672820: call java.lang.Character methods directly without generating separate tables.
5282 EXCEPTION_MARK;
5283 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5284
5285 // return value
5286 JavaValue result(T_BOOLEAN);
5287 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5288 JavaCallArguments args;
5289 args.push_int(unicode_ch);
5290
5291 // public static boolean isJavaIdentifierStart(char ch);
5292 JavaCalls::call_static(&result,
5293 klass,
5294 vmSymbols::isJavaIdentifierStart_name(),
5295 vmSymbols::int_bool_signature(),
5296 &args,
5297 THREAD);
5298
5299 if (HAS_PENDING_EXCEPTION) {
5300 CLEAR_PENDING_EXCEPTION;
5301 return 0;
5302 }
5303 if (result.get_jboolean()) {
5304 continue;
5305 }
5306
5307 if (not_first_ch) {
5308 // public static boolean isJavaIdentifierPart(char ch);
5309 JavaCalls::call_static(&result,
5310 klass,
5311 vmSymbols::isJavaIdentifierPart_name(),
5312 vmSymbols::int_bool_signature(),
5313 &args,
5314 THREAD);
5315
5316 if (HAS_PENDING_EXCEPTION) {
5317 CLEAR_PENDING_EXCEPTION;
5318 return 0;
5319 }
5320
5321 if (result.get_jboolean()) {
5322 continue;
5323 }
5324 }
5325 }
5326 return (not_first_ch) ? old_p : NULL;
5327 }
5328 return (not_first_ch) ? p : NULL;
5329 }
5330
5331
5332 // Take pointer to a string. Skip over the longest part of the string that could
5333 // be taken as a field signature. Allow "void" if void_ok.
5334 // Return a pointer to just past the signature.
5335 // Return NULL if no legal signature is found.
5336 char* ClassFileParser::skip_over_field_signature(char* signature,
5337 bool void_ok,
5338 unsigned int length,
5339 TRAPS) {
5340 unsigned int array_dim = 0;
5341 while (length > 0) {
5342 switch (signature[0]) {
5343 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5344 case JVM_SIGNATURE_BOOLEAN:
5345 case JVM_SIGNATURE_BYTE:
5346 case JVM_SIGNATURE_CHAR:
5347 case JVM_SIGNATURE_SHORT:
5348 case JVM_SIGNATURE_INT:
5349 case JVM_SIGNATURE_FLOAT:
5350 case JVM_SIGNATURE_LONG:
5351 case JVM_SIGNATURE_DOUBLE:
5352 return signature + 1;
5353 case JVM_SIGNATURE_CLASS: {
5354 if (_major_version < JAVA_1_5_VERSION) {
5355 // Skip over the class name if one is there
5356 char* p = skip_over_field_name(signature + 1, true, --length);
5357
5358 // The next character better be a semicolon
5359 if (p && (p - signature) > 1 && p[0] == ';') {
5360 return p + 1;
5361 }
5362 } else {
5363 // 4900761: For class version > 48, any unicode is allowed in class name.
5364 length--;
5365 signature++;
5366 while (length > 0 && signature[0] != ';') {
5367 if (signature[0] == '.') {
5368 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5369 }
5370 length--;
5371 signature++;
5372 }
5373 if (signature[0] == ';') { return signature + 1; }
5374 }
5375
5376 return NULL;
5377 }
5378 case JVM_SIGNATURE_ARRAY:
5379 array_dim++;
5380 if (array_dim > 255) {
5381 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5382 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5383 }
5384 // The rest of what's there better be a legal signature
5385 signature++;
5386 length--;
5387 void_ok = false;
5388 break;
5389
5390 default:
5391 return NULL;
5392 }
5393 }
5394 return NULL;
5395 }