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