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