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_Hidden_signature):
1790 if (_location != _in_method) break; // only allow for methods
1791 if (!privileged) break; // only allow in privileged code
1792 return _method_LambdaForm_Hidden;
1793 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1794 if (_location != _in_field) break; // only allow for fields
1795 if (!privileged) break; // only allow in privileged code
1796 return _field_Stable;
1797 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1798 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1799 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1800 return _sun_misc_Contended;
1801 default: break;
1802 }
1803 return AnnotationCollector::_unknown;
1804 }
1805
1806 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1807 if (is_contended())
1808 f->set_contended_group(contended_group());
1809 if (is_stable())
1810 f->set_stable(true);
1811 }
1812
1813 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1814 // If there's an error deallocate metadata for field annotations
1815 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1816 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1817 }
1818
1819 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1820 if (has_annotation(_method_CallerSensitive))
1821 m->set_caller_sensitive(true);
1822 if (has_annotation(_method_ForceInline))
1823 m->set_force_inline(true);
1824 if (has_annotation(_method_DontInline))
1825 m->set_dont_inline(true);
1826 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1827 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1828 if (has_annotation(_method_LambdaForm_Hidden))
1829 m->set_hidden(true);
1830 }
1831
1832 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1833 k->set_is_contended(is_contended());
1834 }
1835
1836
1837 #define MAX_ARGS_SIZE 255
1838 #define MAX_CODE_SIZE 65535
1839 #define INITIAL_MAX_LVT_NUMBER 256
1840
1841 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1842 *
1843 * Rules for LVT's and LVTT's are:
1844 * - There can be any number of LVT's and LVTT's.
1845 * - If there are n LVT's, it is the same as if there was just
1846 * one LVT containing all the entries from the n LVT's.
1847 * - There may be no more than one LVT entry per local variable.
1848 * Two LVT entries are 'equal' if these fields are the same:
1849 * start_pc, length, name, slot
1850 * - There may be no more than one LVTT entry per each LVT entry.
1851 * Each LVTT entry has to match some LVT entry.
1852 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1853 */
1854 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1855 int lvt_cnt,
1856 u2* localvariable_table_length,
1857 u2** localvariable_table_start,
1858 int lvtt_cnt,
1859 u2* localvariable_type_table_length,
1860 u2** localvariable_type_table_start,
1861 TRAPS) {
1862
1863 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1864 initialize_hashtable(lvt_Hash);
1865
1866 // To fill LocalVariableTable in
1867 Classfile_LVT_Element* cf_lvt;
1868 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1869
1870 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1871 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1872 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1873 copy_lvt_element(&cf_lvt[idx], lvt);
1874 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1875 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1876 && _need_verify
1877 && _major_version >= JAVA_1_5_VERSION) {
1878 clear_hashtable(lvt_Hash);
1879 classfile_parse_error("Duplicated LocalVariableTable attribute "
1880 "entry for '%s' in class file %s",
1881 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1882 CHECK);
1883 }
1884 }
1885 }
1886
1887 // To merge LocalVariableTable and LocalVariableTypeTable
1888 Classfile_LVT_Element* cf_lvtt;
1889 LocalVariableTableElement lvtt_elem;
1890
1891 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1892 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1893 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1894 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1895 int index = hash(&lvtt_elem);
1896 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1897 if (entry == NULL) {
1898 if (_need_verify) {
1899 clear_hashtable(lvt_Hash);
1900 classfile_parse_error("LVTT entry for '%s' in class file %s "
1901 "does not match any LVT entry",
1902 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1903 CHECK);
1904 }
1905 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1906 clear_hashtable(lvt_Hash);
1907 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1908 "entry for '%s' in class file %s",
1909 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1910 CHECK);
1911 } else {
1912 // to add generic signatures into LocalVariableTable
1913 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1914 }
1915 }
1916 }
1917 clear_hashtable(lvt_Hash);
1918 }
1919
1920
1921 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1922 u1* runtime_visible_annotations,
1923 int runtime_visible_annotations_length,
1924 u1* runtime_invisible_annotations,
1925 int runtime_invisible_annotations_length,
1926 u1* runtime_visible_parameter_annotations,
1927 int runtime_visible_parameter_annotations_length,
1928 u1* runtime_invisible_parameter_annotations,
1929 int runtime_invisible_parameter_annotations_length,
1930 u1* runtime_visible_type_annotations,
1931 int runtime_visible_type_annotations_length,
1932 u1* runtime_invisible_type_annotations,
1933 int runtime_invisible_type_annotations_length,
1934 u1* annotation_default,
1935 int annotation_default_length,
1936 TRAPS) {
1937
1938 AnnotationArray* a;
1939
1940 if (runtime_visible_annotations_length +
1941 runtime_invisible_annotations_length > 0) {
1942 a = assemble_annotations(runtime_visible_annotations,
1943 runtime_visible_annotations_length,
1944 runtime_invisible_annotations,
1945 runtime_invisible_annotations_length,
1946 CHECK);
1947 cm->set_method_annotations(a);
1948 }
1949
1950 if (runtime_visible_parameter_annotations_length +
1951 runtime_invisible_parameter_annotations_length > 0) {
1952 a = assemble_annotations(runtime_visible_parameter_annotations,
1953 runtime_visible_parameter_annotations_length,
1954 runtime_invisible_parameter_annotations,
1955 runtime_invisible_parameter_annotations_length,
1956 CHECK);
1957 cm->set_parameter_annotations(a);
1958 }
1959
1960 if (annotation_default_length > 0) {
1961 a = assemble_annotations(annotation_default,
1962 annotation_default_length,
1963 NULL,
1964 0,
1965 CHECK);
1966 cm->set_default_annotations(a);
1967 }
1968
1969 if (runtime_visible_type_annotations_length +
1970 runtime_invisible_type_annotations_length > 0) {
1971 a = assemble_annotations(runtime_visible_type_annotations,
1972 runtime_visible_type_annotations_length,
1973 runtime_invisible_type_annotations,
1974 runtime_invisible_type_annotations_length,
1975 CHECK);
1976 cm->set_type_annotations(a);
1977 }
1978 }
1979
1980
1981 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1982 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1983 // Method* to save footprint, so we only know the size of the resulting Method* when the
1984 // entire method attribute is parsed.
1985 //
1986 // The promoted_flags parameter is used to pass relevant access_flags
1987 // from the method back up to the containing klass. These flag values
1988 // are added to klass's access_flags.
1989
1990 methodHandle ClassFileParser::parse_method(bool is_interface,
1991 AccessFlags *promoted_flags,
1992 TRAPS) {
1993 ClassFileStream* cfs = stream();
1994 methodHandle nullHandle;
1995 ResourceMark rm(THREAD);
1996 // Parse fixed parts
1997 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1998
1999 int flags = cfs->get_u2_fast();
2000 u2 name_index = cfs->get_u2_fast();
2001 int cp_size = _cp->length();
2002 check_property(
2003 valid_symbol_at(name_index),
2004 "Illegal constant pool index %u for method name in class file %s",
2005 name_index, CHECK_(nullHandle));
2006 Symbol* name = _cp->symbol_at(name_index);
2007 verify_legal_method_name(name, CHECK_(nullHandle));
2008
2009 u2 signature_index = cfs->get_u2_fast();
2010 guarantee_property(
2011 valid_symbol_at(signature_index),
2012 "Illegal constant pool index %u for method signature in class file %s",
2013 signature_index, CHECK_(nullHandle));
2014 Symbol* signature = _cp->symbol_at(signature_index);
2015
2016 AccessFlags access_flags;
2017 if (name == vmSymbols::class_initializer_name()) {
2018 // We ignore the other access flags for a valid class initializer.
2019 // (JVM Spec 2nd ed., chapter 4.6)
2020 if (_major_version < 51) { // backward compatibility
2021 flags = JVM_ACC_STATIC;
2022 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2023 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2024 }
2025 } else {
2026 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2027 }
2028
2029 int args_size = -1; // only used when _need_verify is true
2030 if (_need_verify) {
2031 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2032 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2033 if (args_size > MAX_ARGS_SIZE) {
2034 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2035 }
2036 }
2037
2038 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2039
2040 // Default values for code and exceptions attribute elements
2041 u2 max_stack = 0;
2042 u2 max_locals = 0;
2043 u4 code_length = 0;
2044 u1* code_start = 0;
2045 u2 exception_table_length = 0;
2046 u2* exception_table_start = NULL;
2047 Array<int>* exception_handlers = Universe::the_empty_int_array();
2048 u2 checked_exceptions_length = 0;
2049 u2* checked_exceptions_start = NULL;
2050 CompressedLineNumberWriteStream* linenumber_table = NULL;
2051 int linenumber_table_length = 0;
2052 int total_lvt_length = 0;
2053 u2 lvt_cnt = 0;
2054 u2 lvtt_cnt = 0;
2055 bool lvt_allocated = false;
2056 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2057 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2058 u2* localvariable_table_length;
2059 u2** localvariable_table_start;
2060 u2* localvariable_type_table_length;
2061 u2** localvariable_type_table_start;
2062 int method_parameters_length = -1;
2063 u1* method_parameters_data = NULL;
2064 bool method_parameters_seen = false;
2065 bool parsed_code_attribute = false;
2066 bool parsed_checked_exceptions_attribute = false;
2067 bool parsed_stackmap_attribute = false;
2068 // stackmap attribute - JDK1.5
2069 u1* stackmap_data = NULL;
2070 int stackmap_data_length = 0;
2071 u2 generic_signature_index = 0;
2072 MethodAnnotationCollector parsed_annotations;
2073 u1* runtime_visible_annotations = NULL;
2074 int runtime_visible_annotations_length = 0;
2075 u1* runtime_invisible_annotations = NULL;
2076 int runtime_invisible_annotations_length = 0;
2077 u1* runtime_visible_parameter_annotations = NULL;
2078 int runtime_visible_parameter_annotations_length = 0;
2079 u1* runtime_invisible_parameter_annotations = NULL;
2080 int runtime_invisible_parameter_annotations_length = 0;
2081 u1* runtime_visible_type_annotations = NULL;
2082 int runtime_visible_type_annotations_length = 0;
2083 u1* runtime_invisible_type_annotations = NULL;
2084 int runtime_invisible_type_annotations_length = 0;
2085 bool runtime_invisible_annotations_exists = false;
2086 bool runtime_invisible_type_annotations_exists = false;
2087 bool runtime_invisible_parameter_annotations_exists = false;
2088 u1* annotation_default = NULL;
2089 int annotation_default_length = 0;
2090
2091 // Parse code and exceptions attribute
2092 u2 method_attributes_count = cfs->get_u2_fast();
2093 while (method_attributes_count--) {
2094 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2095 u2 method_attribute_name_index = cfs->get_u2_fast();
2096 u4 method_attribute_length = cfs->get_u4_fast();
2097 check_property(
2098 valid_symbol_at(method_attribute_name_index),
2099 "Invalid method attribute name index %u in class file %s",
2100 method_attribute_name_index, CHECK_(nullHandle));
2101
2102 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2103 if (method_attribute_name == vmSymbols::tag_code()) {
2104 // Parse Code attribute
2105 if (_need_verify) {
2106 guarantee_property(
2107 !access_flags.is_native() && !access_flags.is_abstract(),
2108 "Code attribute in native or abstract methods in class file %s",
2109 CHECK_(nullHandle));
2110 }
2111 if (parsed_code_attribute) {
2112 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2113 }
2114 parsed_code_attribute = true;
2115
2116 // Stack size, locals size, and code size
2117 if (_major_version == 45 && _minor_version <= 2) {
2118 cfs->guarantee_more(4, CHECK_(nullHandle));
2119 max_stack = cfs->get_u1_fast();
2120 max_locals = cfs->get_u1_fast();
2121 code_length = cfs->get_u2_fast();
2122 } else {
2123 cfs->guarantee_more(8, CHECK_(nullHandle));
2124 max_stack = cfs->get_u2_fast();
2125 max_locals = cfs->get_u2_fast();
2126 code_length = cfs->get_u4_fast();
2127 }
2128 if (_need_verify) {
2129 guarantee_property(args_size <= max_locals,
2130 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2131 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2132 "Invalid method Code length %u in class file %s",
2133 code_length, CHECK_(nullHandle));
2134 }
2135 // Code pointer
2136 code_start = cfs->get_u1_buffer();
2137 assert(code_start != NULL, "null code start");
2138 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2139 cfs->skip_u1_fast(code_length);
2140
2141 // Exception handler table
2142 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2143 exception_table_length = cfs->get_u2_fast();
2144 if (exception_table_length > 0) {
2145 exception_table_start =
2146 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2147 }
2148
2149 // Parse additional attributes in code attribute
2150 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2151 u2 code_attributes_count = cfs->get_u2_fast();
2152
2153 unsigned int calculated_attribute_length = 0;
2154
2155 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2156 calculated_attribute_length =
2157 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2158 } else {
2159 // max_stack, locals and length are smaller in pre-version 45.2 classes
2160 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2161 }
2162 calculated_attribute_length +=
2163 code_length +
2164 sizeof(exception_table_length) +
2165 sizeof(code_attributes_count) +
2166 exception_table_length *
2167 ( sizeof(u2) + // start_pc
2168 sizeof(u2) + // end_pc
2169 sizeof(u2) + // handler_pc
2170 sizeof(u2) ); // catch_type_index
2171
2172 while (code_attributes_count--) {
2173 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2174 u2 code_attribute_name_index = cfs->get_u2_fast();
2175 u4 code_attribute_length = cfs->get_u4_fast();
2176 calculated_attribute_length += code_attribute_length +
2177 sizeof(code_attribute_name_index) +
2178 sizeof(code_attribute_length);
2179 check_property(valid_symbol_at(code_attribute_name_index),
2180 "Invalid code attribute name index %u in class file %s",
2181 code_attribute_name_index,
2182 CHECK_(nullHandle));
2183 if (LoadLineNumberTables &&
2184 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2185 // Parse and compress line number table
2186 parse_linenumber_table(code_attribute_length, code_length,
2187 &linenumber_table, CHECK_(nullHandle));
2188
2189 } else if (LoadLocalVariableTables &&
2190 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2191 // Parse local variable table
2192 if (!lvt_allocated) {
2193 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2194 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2195 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2196 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2197 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2198 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2199 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2200 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2201 lvt_allocated = true;
2202 }
2203 if (lvt_cnt == max_lvt_cnt) {
2204 max_lvt_cnt <<= 1;
2205 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2206 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2207 }
2208 localvariable_table_start[lvt_cnt] =
2209 parse_localvariable_table(code_length,
2210 max_locals,
2211 code_attribute_length,
2212 &localvariable_table_length[lvt_cnt],
2213 false, // is not LVTT
2214 CHECK_(nullHandle));
2215 total_lvt_length += localvariable_table_length[lvt_cnt];
2216 lvt_cnt++;
2217 } else if (LoadLocalVariableTypeTables &&
2218 _major_version >= JAVA_1_5_VERSION &&
2219 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2220 if (!lvt_allocated) {
2221 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2222 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2223 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2224 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2225 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2226 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2227 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2228 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2229 lvt_allocated = true;
2230 }
2231 // Parse local variable type table
2232 if (lvtt_cnt == max_lvtt_cnt) {
2233 max_lvtt_cnt <<= 1;
2234 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2235 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2236 }
2237 localvariable_type_table_start[lvtt_cnt] =
2238 parse_localvariable_table(code_length,
2239 max_locals,
2240 code_attribute_length,
2241 &localvariable_type_table_length[lvtt_cnt],
2242 true, // is LVTT
2243 CHECK_(nullHandle));
2244 lvtt_cnt++;
2245 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2246 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2247 // Stack map is only needed by the new verifier in JDK1.5.
2248 if (parsed_stackmap_attribute) {
2249 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2250 }
2251 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2252 stackmap_data_length = code_attribute_length;
2253 parsed_stackmap_attribute = true;
2254 } else {
2255 // Skip unknown attributes
2256 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2257 }
2258 }
2259 // check method attribute length
2260 if (_need_verify) {
2261 guarantee_property(method_attribute_length == calculated_attribute_length,
2262 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2263 }
2264 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2265 // Parse Exceptions attribute
2266 if (parsed_checked_exceptions_attribute) {
2267 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2268 }
2269 parsed_checked_exceptions_attribute = true;
2270 checked_exceptions_start =
2271 parse_checked_exceptions(&checked_exceptions_length,
2272 method_attribute_length,
2273 CHECK_(nullHandle));
2274 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2275 // reject multiple method parameters
2276 if (method_parameters_seen) {
2277 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2278 }
2279 method_parameters_seen = true;
2280 method_parameters_length = cfs->get_u1_fast();
2281 const u2 real_length = (method_parameters_length * 4u) + 1u;
2282 if (method_attribute_length != real_length) {
2283 classfile_parse_error(
2284 "Invalid MethodParameters method attribute length %u in class file",
2285 method_attribute_length, CHECK_(nullHandle));
2286 }
2287 method_parameters_data = cfs->get_u1_buffer();
2288 cfs->skip_u2_fast(method_parameters_length);
2289 cfs->skip_u2_fast(method_parameters_length);
2290 // ignore this attribute if it cannot be reflected
2291 if (!SystemDictionary::Parameter_klass_loaded())
2292 method_parameters_length = -1;
2293 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2294 if (method_attribute_length != 0) {
2295 classfile_parse_error(
2296 "Invalid Synthetic method attribute length %u in class file %s",
2297 method_attribute_length, CHECK_(nullHandle));
2298 }
2299 // Should we check that there hasn't already been a synthetic attribute?
2300 access_flags.set_is_synthetic();
2301 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2302 if (method_attribute_length != 0) {
2303 classfile_parse_error(
2304 "Invalid Deprecated method attribute length %u in class file %s",
2305 method_attribute_length, CHECK_(nullHandle));
2306 }
2307 } else if (_major_version >= JAVA_1_5_VERSION) {
2308 if (method_attribute_name == vmSymbols::tag_signature()) {
2309 if (method_attribute_length != 2) {
2310 classfile_parse_error(
2311 "Invalid Signature attribute length %u in class file %s",
2312 method_attribute_length, CHECK_(nullHandle));
2313 }
2314 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2315 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2316 if (runtime_visible_annotations != NULL) {
2317 classfile_parse_error(
2318 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2319 }
2320 runtime_visible_annotations_length = method_attribute_length;
2321 runtime_visible_annotations = cfs->get_u1_buffer();
2322 assert(runtime_visible_annotations != NULL, "null visible annotations");
2323 parse_annotations(runtime_visible_annotations,
2324 runtime_visible_annotations_length, &parsed_annotations,
2325 CHECK_(nullHandle));
2326 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2327 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2328 if (runtime_invisible_annotations_exists) {
2329 classfile_parse_error(
2330 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2331 }
2332 runtime_invisible_annotations_exists = true;
2333 if (PreserveAllAnnotations) {
2334 runtime_invisible_annotations_length = method_attribute_length;
2335 runtime_invisible_annotations = cfs->get_u1_buffer();
2336 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2337 }
2338 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2339 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2340 if (runtime_visible_parameter_annotations != NULL) {
2341 classfile_parse_error(
2342 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2343 }
2344 runtime_visible_parameter_annotations_length = method_attribute_length;
2345 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2346 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2347 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2348 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2349 if (runtime_invisible_parameter_annotations_exists) {
2350 classfile_parse_error(
2351 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2352 }
2353 runtime_invisible_parameter_annotations_exists = true;
2354 if (PreserveAllAnnotations) {
2355 runtime_invisible_parameter_annotations_length = method_attribute_length;
2356 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2357 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2358 }
2359 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2360 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2361 if (annotation_default != NULL) {
2362 classfile_parse_error(
2363 "Multiple AnnotationDefault attributes for method in class file %s",
2364 CHECK_(nullHandle));
2365 }
2366 annotation_default_length = method_attribute_length;
2367 annotation_default = cfs->get_u1_buffer();
2368 assert(annotation_default != NULL, "null annotation default");
2369 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2370 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2371 if (runtime_visible_type_annotations != NULL) {
2372 classfile_parse_error(
2373 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2374 CHECK_(nullHandle));
2375 }
2376 runtime_visible_type_annotations_length = method_attribute_length;
2377 runtime_visible_type_annotations = cfs->get_u1_buffer();
2378 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2379 // No need for the VM to parse Type annotations
2380 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2381 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2382 if (runtime_invisible_type_annotations_exists) {
2383 classfile_parse_error(
2384 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2385 CHECK_(nullHandle));
2386 } else {
2387 runtime_invisible_type_annotations_exists = true;
2388 }
2389 if (PreserveAllAnnotations) {
2390 runtime_invisible_type_annotations_length = method_attribute_length;
2391 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2392 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2393 }
2394 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2395 } else {
2396 // Skip unknown attributes
2397 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2398 }
2399 } else {
2400 // Skip unknown attributes
2401 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2402 }
2403 }
2404
2405 if (linenumber_table != NULL) {
2406 linenumber_table->write_terminator();
2407 linenumber_table_length = linenumber_table->position();
2408 }
2409
2410 // Make sure there's at least one Code attribute in non-native/non-abstract method
2411 if (_need_verify) {
2412 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2413 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2414 }
2415
2416 // All sizing information for a Method* is finally available, now create it
2417 InlineTableSizes sizes(
2418 total_lvt_length,
2419 linenumber_table_length,
2420 exception_table_length,
2421 checked_exceptions_length,
2422 method_parameters_length,
2423 generic_signature_index,
2424 runtime_visible_annotations_length +
2425 runtime_invisible_annotations_length,
2426 runtime_visible_parameter_annotations_length +
2427 runtime_invisible_parameter_annotations_length,
2428 runtime_visible_type_annotations_length +
2429 runtime_invisible_type_annotations_length,
2430 annotation_default_length,
2431 0);
2432
2433 Method* m = Method::allocate(
2434 _loader_data, code_length, access_flags, &sizes,
2435 ConstMethod::NORMAL, CHECK_(nullHandle));
2436
2437 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2438
2439 // Fill in information from fixed part (access_flags already set)
2440 m->set_constants(_cp);
2441 m->set_name_index(name_index);
2442 m->set_signature_index(signature_index);
2443 #ifdef CC_INTERP
2444 // hmm is there a gc issue here??
2445 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2446 m->set_result_index(rtf.type());
2447 #endif
2448
2449 if (args_size >= 0) {
2450 m->set_size_of_parameters(args_size);
2451 } else {
2452 m->compute_size_of_parameters(THREAD);
2453 }
2454 #ifdef ASSERT
2455 if (args_size >= 0) {
2456 m->compute_size_of_parameters(THREAD);
2457 assert(args_size == m->size_of_parameters(), "");
2458 }
2459 #endif
2460
2461 // Fill in code attribute information
2462 m->set_max_stack(max_stack);
2463 m->set_max_locals(max_locals);
2464 if (stackmap_data != NULL) {
2465 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2466 stackmap_data_length, CHECK_NULL);
2467 }
2468
2469 // Copy byte codes
2470 m->set_code(code_start);
2471
2472 // Copy line number table
2473 if (linenumber_table != NULL) {
2474 memcpy(m->compressed_linenumber_table(),
2475 linenumber_table->buffer(), linenumber_table_length);
2476 }
2477
2478 // Copy exception table
2479 if (exception_table_length > 0) {
2480 int size =
2481 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2482 copy_u2_with_conversion((u2*) m->exception_table_start(),
2483 exception_table_start, size);
2484 }
2485
2486 // Copy method parameters
2487 if (method_parameters_length > 0) {
2488 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2489 for (int i = 0; i < method_parameters_length; i++) {
2490 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2491 method_parameters_data += 2;
2492 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2493 method_parameters_data += 2;
2494 }
2495 }
2496
2497 // Copy checked exceptions
2498 if (checked_exceptions_length > 0) {
2499 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2500 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2501 }
2502
2503 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2504 if (total_lvt_length > 0) {
2505 promoted_flags->set_has_localvariable_table();
2506 copy_localvariable_table(m->constMethod(), lvt_cnt,
2507 localvariable_table_length,
2508 localvariable_table_start,
2509 lvtt_cnt,
2510 localvariable_type_table_length,
2511 localvariable_type_table_start, CHECK_NULL);
2512 }
2513
2514 if (parsed_annotations.has_any_annotations())
2515 parsed_annotations.apply_to(m);
2516
2517 // Copy annotations
2518 copy_method_annotations(m->constMethod(),
2519 runtime_visible_annotations,
2520 runtime_visible_annotations_length,
2521 runtime_invisible_annotations,
2522 runtime_invisible_annotations_length,
2523 runtime_visible_parameter_annotations,
2524 runtime_visible_parameter_annotations_length,
2525 runtime_invisible_parameter_annotations,
2526 runtime_invisible_parameter_annotations_length,
2527 runtime_visible_type_annotations,
2528 runtime_visible_type_annotations_length,
2529 runtime_invisible_type_annotations,
2530 runtime_invisible_type_annotations_length,
2531 annotation_default,
2532 annotation_default_length,
2533 CHECK_NULL);
2534
2535 if (name == vmSymbols::finalize_method_name() &&
2536 signature == vmSymbols::void_method_signature()) {
2537 if (m->is_empty_method()) {
2538 _has_empty_finalizer = true;
2539 } else {
2540 _has_finalizer = true;
2541 }
2542 }
2543 if (name == vmSymbols::object_initializer_name() &&
2544 signature == vmSymbols::void_method_signature() &&
2545 m->is_vanilla_constructor()) {
2546 _has_vanilla_constructor = true;
2547 }
2548
2549 NOT_PRODUCT(m->verify());
2550 return m;
2551 }
2552
2553
2554 // The promoted_flags parameter is used to pass relevant access_flags
2555 // from the methods back up to the containing klass. These flag values
2556 // are added to klass's access_flags.
2557
2558 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2559 AccessFlags* promoted_flags,
2560 bool* has_final_method,
2561 bool* declares_default_methods,
2562 TRAPS) {
2563 ClassFileStream* cfs = stream();
2564 cfs->guarantee_more(2, CHECK_NULL); // length
2565 u2 length = cfs->get_u2_fast();
2566 if (length == 0) {
2567 _methods = Universe::the_empty_method_array();
2568 } else {
2569 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2570
2571 HandleMark hm(THREAD);
2572 for (int index = 0; index < length; index++) {
2573 methodHandle method = parse_method(is_interface,
2574 promoted_flags,
2575 CHECK_NULL);
2576
2577 if (method->is_final()) {
2578 *has_final_method = true;
2579 }
2580 // declares_default_methods: declares concrete instance methods, any access flags
2581 // used for interface initialization, and default method inheritance analysis
2582 if (is_interface && !(*declares_default_methods)
2583 && !method->is_abstract() && !method->is_static()) {
2584 *declares_default_methods = true;
2585 }
2586 _methods->at_put(index, method());
2587 }
2588
2589 if (_need_verify && length > 1) {
2590 // Check duplicated methods
2591 ResourceMark rm(THREAD);
2592 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2593 THREAD, NameSigHash*, HASH_ROW_SIZE);
2594 initialize_hashtable(names_and_sigs);
2595 bool dup = false;
2596 {
2597 debug_only(No_Safepoint_Verifier nsv;)
2598 for (int i = 0; i < length; i++) {
2599 Method* m = _methods->at(i);
2600 // If no duplicates, add name/signature in hashtable names_and_sigs.
2601 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2602 dup = true;
2603 break;
2604 }
2605 }
2606 }
2607 if (dup) {
2608 classfile_parse_error("Duplicate method name&signature in class file %s",
2609 CHECK_NULL);
2610 }
2611 }
2612 }
2613 return _methods;
2614 }
2615
2616
2617 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2618 int length = methods->length();
2619 // If JVMTI original method ordering or sharing is enabled we have to
2620 // remember the original class file ordering.
2621 // We temporarily use the vtable_index field in the Method* to store the
2622 // class file index, so we can read in after calling qsort.
2623 // Put the method ordering in the shared archive.
2624 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2625 for (int index = 0; index < length; index++) {
2626 Method* m = methods->at(index);
2627 assert(!m->valid_vtable_index(), "vtable index should not be set");
2628 m->set_vtable_index(index);
2629 }
2630 }
2631 // Sort method array by ascending method name (for faster lookups & vtable construction)
2632 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2633 Method::sort_methods(methods);
2634
2635 intArray* method_ordering = NULL;
2636 // If JVMTI original method ordering or sharing is enabled construct int
2637 // array remembering the original ordering
2638 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2639 method_ordering = new intArray(length);
2640 for (int index = 0; index < length; index++) {
2641 Method* m = methods->at(index);
2642 int old_index = m->vtable_index();
2643 assert(old_index >= 0 && old_index < length, "invalid method index");
2644 method_ordering->at_put(index, old_index);
2645 m->set_vtable_index(Method::invalid_vtable_index);
2646 }
2647 }
2648 return method_ordering;
2649 }
2650
2651 // Parse generic_signature attribute for methods and fields
2652 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2653 ClassFileStream* cfs = stream();
2654 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2655 u2 generic_signature_index = cfs->get_u2_fast();
2656 check_property(
2657 valid_symbol_at(generic_signature_index),
2658 "Invalid Signature attribute at constant pool index %u in class file %s",
2659 generic_signature_index, CHECK_0);
2660 return generic_signature_index;
2661 }
2662
2663 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2664 ClassFileStream* cfs = stream();
2665 cfs->guarantee_more(2, CHECK); // sourcefile_index
2666 u2 sourcefile_index = cfs->get_u2_fast();
2667 check_property(
2668 valid_symbol_at(sourcefile_index),
2669 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2670 sourcefile_index, CHECK);
2671 set_class_sourcefile_index(sourcefile_index);
2672 }
2673
2674
2675
2676 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2677 ClassFileStream* cfs = stream();
2678 u1* sde_buffer = cfs->get_u1_buffer();
2679 assert(sde_buffer != NULL, "null sde buffer");
2680
2681 // Don't bother storing it if there is no way to retrieve it
2682 if (JvmtiExport::can_get_source_debug_extension()) {
2683 assert((length+1) > length, "Overflow checking");
2684 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2685 for (int i = 0; i < length; i++) {
2686 sde[i] = sde_buffer[i];
2687 }
2688 sde[length] = '\0';
2689 set_class_sde_buffer((char*)sde, length);
2690 }
2691 // Got utf8 string, set stream position forward
2692 cfs->skip_u1(length, CHECK);
2693 }
2694
2695
2696 // Inner classes can be static, private or protected (classic VM does this)
2697 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2698
2699 // Return number of classes in the inner classes attribute table
2700 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2701 bool parsed_enclosingmethod_attribute,
2702 u2 enclosing_method_class_index,
2703 u2 enclosing_method_method_index,
2704 TRAPS) {
2705 ClassFileStream* cfs = stream();
2706 u1* current_mark = cfs->current();
2707 u2 length = 0;
2708 if (inner_classes_attribute_start != NULL) {
2709 cfs->set_current(inner_classes_attribute_start);
2710 cfs->guarantee_more(2, CHECK_0); // length
2711 length = cfs->get_u2_fast();
2712 }
2713
2714 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2715 // method data:
2716 // [inner_class_info_index,
2717 // outer_class_info_index,
2718 // inner_name_index,
2719 // inner_class_access_flags,
2720 // ...
2721 // enclosing_method_class_index,
2722 // enclosing_method_method_index]
2723 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2724 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2725 _inner_classes = inner_classes;
2726
2727 int index = 0;
2728 int cp_size = _cp->length();
2729 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2730 for (int n = 0; n < length; n++) {
2731 // Inner class index
2732 u2 inner_class_info_index = cfs->get_u2_fast();
2733 check_property(
2734 inner_class_info_index == 0 ||
2735 valid_klass_reference_at(inner_class_info_index),
2736 "inner_class_info_index %u has bad constant type in class file %s",
2737 inner_class_info_index, CHECK_0);
2738 // Outer class index
2739 u2 outer_class_info_index = cfs->get_u2_fast();
2740 check_property(
2741 outer_class_info_index == 0 ||
2742 valid_klass_reference_at(outer_class_info_index),
2743 "outer_class_info_index %u has bad constant type in class file %s",
2744 outer_class_info_index, CHECK_0);
2745 // Inner class name
2746 u2 inner_name_index = cfs->get_u2_fast();
2747 check_property(
2748 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2749 "inner_name_index %u has bad constant type in class file %s",
2750 inner_name_index, CHECK_0);
2751 if (_need_verify) {
2752 guarantee_property(inner_class_info_index != outer_class_info_index,
2753 "Class is both outer and inner class in class file %s", CHECK_0);
2754 }
2755 // Access flags
2756 AccessFlags inner_access_flags;
2757 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2758 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2759 // Set abstract bit for old class files for backward compatibility
2760 flags |= JVM_ACC_ABSTRACT;
2761 }
2762 verify_legal_class_modifiers(flags, CHECK_0);
2763 inner_access_flags.set_flags(flags);
2764
2765 inner_classes->at_put(index++, inner_class_info_index);
2766 inner_classes->at_put(index++, outer_class_info_index);
2767 inner_classes->at_put(index++, inner_name_index);
2768 inner_classes->at_put(index++, inner_access_flags.as_short());
2769 }
2770
2771 // 4347400: make sure there's no duplicate entry in the classes array
2772 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2773 for(int i = 0; i < length * 4; i += 4) {
2774 for(int j = i + 4; j < length * 4; j += 4) {
2775 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2776 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2777 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2778 inner_classes->at(i+3) != inner_classes->at(j+3)),
2779 "Duplicate entry in InnerClasses in class file %s",
2780 CHECK_0);
2781 }
2782 }
2783 }
2784
2785 // Set EnclosingMethod class and method indexes.
2786 if (parsed_enclosingmethod_attribute) {
2787 inner_classes->at_put(index++, enclosing_method_class_index);
2788 inner_classes->at_put(index++, enclosing_method_method_index);
2789 }
2790 assert(index == size, "wrong size");
2791
2792 // Restore buffer's current position.
2793 cfs->set_current(current_mark);
2794
2795 return length;
2796 }
2797
2798 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2799 set_class_synthetic_flag(true);
2800 }
2801
2802 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2803 ClassFileStream* cfs = stream();
2804 u2 signature_index = cfs->get_u2(CHECK);
2805 check_property(
2806 valid_symbol_at(signature_index),
2807 "Invalid constant pool index %u in Signature attribute in class file %s",
2808 signature_index, CHECK);
2809 set_class_generic_signature_index(signature_index);
2810 }
2811
2812 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2813 ClassFileStream* cfs = stream();
2814 u1* current_start = cfs->current();
2815
2816 guarantee_property(attribute_byte_length >= sizeof(u2),
2817 "Invalid BootstrapMethods attribute length %u in class file %s",
2818 attribute_byte_length,
2819 CHECK);
2820
2821 cfs->guarantee_more(attribute_byte_length, CHECK);
2822
2823 int attribute_array_length = cfs->get_u2_fast();
2824
2825 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2826 "Short length on BootstrapMethods in class file %s",
2827 CHECK);
2828
2829
2830 // The attribute contains a counted array of counted tuples of shorts,
2831 // represending bootstrap specifiers:
2832 // length*{bootstrap_method_index, argument_count*{argument_index}}
2833 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2834 // operand_count = number of shorts in attr, except for leading length
2835
2836 // The attribute is copied into a short[] array.
2837 // The array begins with a series of short[2] pairs, one for each tuple.
2838 int index_size = (attribute_array_length * 2);
2839
2840 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2841
2842 // Eagerly assign operands so they will be deallocated with the constant
2843 // pool if there is an error.
2844 _cp->set_operands(operands);
2845
2846 int operand_fill_index = index_size;
2847 int cp_size = _cp->length();
2848
2849 for (int n = 0; n < attribute_array_length; n++) {
2850 // Store a 32-bit offset into the header of the operand array.
2851 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2852
2853 // Read a bootstrap specifier.
2854 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2855 u2 bootstrap_method_index = cfs->get_u2_fast();
2856 u2 argument_count = cfs->get_u2_fast();
2857 check_property(
2858 valid_cp_range(bootstrap_method_index, cp_size) &&
2859 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2860 "bootstrap_method_index %u has bad constant type in class file %s",
2861 bootstrap_method_index,
2862 CHECK);
2863
2864 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2865 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2866 CHECK);
2867
2868 operands->at_put(operand_fill_index++, bootstrap_method_index);
2869 operands->at_put(operand_fill_index++, argument_count);
2870
2871 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2872 for (int j = 0; j < argument_count; j++) {
2873 u2 argument_index = cfs->get_u2_fast();
2874 check_property(
2875 valid_cp_range(argument_index, cp_size) &&
2876 _cp->tag_at(argument_index).is_loadable_constant(),
2877 "argument_index %u has bad constant type in class file %s",
2878 argument_index,
2879 CHECK);
2880 operands->at_put(operand_fill_index++, argument_index);
2881 }
2882 }
2883
2884 u1* current_end = cfs->current();
2885 guarantee_property(current_end == current_start + attribute_byte_length,
2886 "Bad length on BootstrapMethods in class file %s",
2887 CHECK);
2888 }
2889
2890 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2891 TRAPS) {
2892 ClassFileStream* cfs = stream();
2893 // Set inner classes attribute to default sentinel
2894 _inner_classes = Universe::the_empty_short_array();
2895 cfs->guarantee_more(2, CHECK); // attributes_count
2896 u2 attributes_count = cfs->get_u2_fast();
2897 bool parsed_sourcefile_attribute = false;
2898 bool parsed_innerclasses_attribute = false;
2899 bool parsed_enclosingmethod_attribute = false;
2900 bool parsed_bootstrap_methods_attribute = false;
2901 u1* runtime_visible_annotations = NULL;
2902 int runtime_visible_annotations_length = 0;
2903 u1* runtime_invisible_annotations = NULL;
2904 int runtime_invisible_annotations_length = 0;
2905 u1* runtime_visible_type_annotations = NULL;
2906 int runtime_visible_type_annotations_length = 0;
2907 u1* runtime_invisible_type_annotations = NULL;
2908 int runtime_invisible_type_annotations_length = 0;
2909 bool runtime_invisible_type_annotations_exists = false;
2910 bool runtime_invisible_annotations_exists = false;
2911 bool parsed_source_debug_ext_annotations_exist = false;
2912 u1* inner_classes_attribute_start = NULL;
2913 u4 inner_classes_attribute_length = 0;
2914 u2 enclosing_method_class_index = 0;
2915 u2 enclosing_method_method_index = 0;
2916 // Iterate over attributes
2917 while (attributes_count--) {
2918 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2919 u2 attribute_name_index = cfs->get_u2_fast();
2920 u4 attribute_length = cfs->get_u4_fast();
2921 check_property(
2922 valid_symbol_at(attribute_name_index),
2923 "Attribute name has bad constant pool index %u in class file %s",
2924 attribute_name_index, CHECK);
2925 Symbol* tag = _cp->symbol_at(attribute_name_index);
2926 if (tag == vmSymbols::tag_source_file()) {
2927 // Check for SourceFile tag
2928 if (_need_verify) {
2929 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2930 }
2931 if (parsed_sourcefile_attribute) {
2932 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2933 } else {
2934 parsed_sourcefile_attribute = true;
2935 }
2936 parse_classfile_sourcefile_attribute(CHECK);
2937 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2938 // Check for SourceDebugExtension tag
2939 if (parsed_source_debug_ext_annotations_exist) {
2940 classfile_parse_error(
2941 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2942 }
2943 parsed_source_debug_ext_annotations_exist = true;
2944 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2945 } else if (tag == vmSymbols::tag_inner_classes()) {
2946 // Check for InnerClasses tag
2947 if (parsed_innerclasses_attribute) {
2948 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2949 } else {
2950 parsed_innerclasses_attribute = true;
2951 }
2952 inner_classes_attribute_start = cfs->get_u1_buffer();
2953 inner_classes_attribute_length = attribute_length;
2954 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2955 } else if (tag == vmSymbols::tag_synthetic()) {
2956 // Check for Synthetic tag
2957 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2958 if (attribute_length != 0) {
2959 classfile_parse_error(
2960 "Invalid Synthetic classfile attribute length %u in class file %s",
2961 attribute_length, CHECK);
2962 }
2963 parse_classfile_synthetic_attribute(CHECK);
2964 } else if (tag == vmSymbols::tag_deprecated()) {
2965 // Check for Deprecatd tag - 4276120
2966 if (attribute_length != 0) {
2967 classfile_parse_error(
2968 "Invalid Deprecated classfile attribute length %u in class file %s",
2969 attribute_length, CHECK);
2970 }
2971 } else if (_major_version >= JAVA_1_5_VERSION) {
2972 if (tag == vmSymbols::tag_signature()) {
2973 if (attribute_length != 2) {
2974 classfile_parse_error(
2975 "Wrong Signature attribute length %u in class file %s",
2976 attribute_length, CHECK);
2977 }
2978 parse_classfile_signature_attribute(CHECK);
2979 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2980 if (runtime_visible_annotations != NULL) {
2981 classfile_parse_error(
2982 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2983 }
2984 runtime_visible_annotations_length = attribute_length;
2985 runtime_visible_annotations = cfs->get_u1_buffer();
2986 assert(runtime_visible_annotations != NULL, "null visible annotations");
2987 parse_annotations(runtime_visible_annotations,
2988 runtime_visible_annotations_length,
2989 parsed_annotations,
2990 CHECK);
2991 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2992 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2993 if (runtime_invisible_annotations_exists) {
2994 classfile_parse_error(
2995 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2996 }
2997 runtime_invisible_annotations_exists = true;
2998 if (PreserveAllAnnotations) {
2999 runtime_invisible_annotations_length = attribute_length;
3000 runtime_invisible_annotations = cfs->get_u1_buffer();
3001 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3002 }
3003 cfs->skip_u1(attribute_length, CHECK);
3004 } else if (tag == vmSymbols::tag_enclosing_method()) {
3005 if (parsed_enclosingmethod_attribute) {
3006 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3007 } else {
3008 parsed_enclosingmethod_attribute = true;
3009 }
3010 guarantee_property(attribute_length == 4,
3011 "Wrong EnclosingMethod attribute length %u in class file %s",
3012 attribute_length, CHECK);
3013 cfs->guarantee_more(4, CHECK); // class_index, method_index
3014 enclosing_method_class_index = cfs->get_u2_fast();
3015 enclosing_method_method_index = cfs->get_u2_fast();
3016 if (enclosing_method_class_index == 0) {
3017 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3018 }
3019 // Validate the constant pool indices and types
3020 check_property(valid_klass_reference_at(enclosing_method_class_index),
3021 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3022 if (enclosing_method_method_index != 0 &&
3023 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3024 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3025 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3026 }
3027 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3028 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3029 if (parsed_bootstrap_methods_attribute)
3030 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3031 parsed_bootstrap_methods_attribute = true;
3032 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3033 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3034 if (runtime_visible_type_annotations != NULL) {
3035 classfile_parse_error(
3036 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3037 }
3038 runtime_visible_type_annotations_length = attribute_length;
3039 runtime_visible_type_annotations = cfs->get_u1_buffer();
3040 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3041 // No need for the VM to parse Type annotations
3042 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3043 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3044 if (runtime_invisible_type_annotations_exists) {
3045 classfile_parse_error(
3046 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3047 } else {
3048 runtime_invisible_type_annotations_exists = true;
3049 }
3050 if (PreserveAllAnnotations) {
3051 runtime_invisible_type_annotations_length = attribute_length;
3052 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3053 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3054 }
3055 cfs->skip_u1(attribute_length, CHECK);
3056 } else {
3057 // Unknown attribute
3058 cfs->skip_u1(attribute_length, CHECK);
3059 }
3060 } else {
3061 // Unknown attribute
3062 cfs->skip_u1(attribute_length, CHECK);
3063 }
3064 }
3065 _annotations = assemble_annotations(runtime_visible_annotations,
3066 runtime_visible_annotations_length,
3067 runtime_invisible_annotations,
3068 runtime_invisible_annotations_length,
3069 CHECK);
3070 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3071 runtime_visible_type_annotations_length,
3072 runtime_invisible_type_annotations,
3073 runtime_invisible_type_annotations_length,
3074 CHECK);
3075
3076 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3077 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3078 inner_classes_attribute_start,
3079 parsed_innerclasses_attribute,
3080 enclosing_method_class_index,
3081 enclosing_method_method_index,
3082 CHECK);
3083 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3084 guarantee_property(
3085 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3086 "Wrong InnerClasses attribute length in class file %s", CHECK);
3087 }
3088 }
3089
3090 if (_max_bootstrap_specifier_index >= 0) {
3091 guarantee_property(parsed_bootstrap_methods_attribute,
3092 "Missing BootstrapMethods attribute in class file %s", CHECK);
3093 }
3094 }
3095
3096 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3097 if (_synthetic_flag)
3098 k->set_is_synthetic();
3099 if (_sourcefile_index != 0) {
3100 k->set_source_file_name_index(_sourcefile_index);
3101 }
3102 if (_generic_signature_index != 0) {
3103 k->set_generic_signature_index(_generic_signature_index);
3104 }
3105 if (_sde_buffer != NULL) {
3106 k->set_source_debug_extension(_sde_buffer, _sde_length);
3107 }
3108 }
3109
3110 // Transfer ownership of metadata allocated to the InstanceKlass.
3111 void ClassFileParser::apply_parsed_class_metadata(
3112 instanceKlassHandle this_klass,
3113 int java_fields_count, TRAPS) {
3114 // Assign annotations if needed
3115 if (_annotations != NULL || _type_annotations != NULL ||
3116 _fields_annotations != NULL || _fields_type_annotations != NULL) {
3117 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3118 annotations->set_class_annotations(_annotations);
3119 annotations->set_class_type_annotations(_type_annotations);
3120 annotations->set_fields_annotations(_fields_annotations);
3121 annotations->set_fields_type_annotations(_fields_type_annotations);
3122 this_klass->set_annotations(annotations);
3123 }
3124
3125 _cp->set_pool_holder(this_klass());
3126 this_klass->set_constants(_cp);
3127 this_klass->set_fields(_fields, java_fields_count);
3128 this_klass->set_methods(_methods);
3129 this_klass->set_inner_classes(_inner_classes);
3130 this_klass->set_local_interfaces(_local_interfaces);
3131 this_klass->set_transitive_interfaces(_transitive_interfaces);
3132
3133 // Clear out these fields so they don't get deallocated by the destructor
3134 clear_class_metadata();
3135 }
3136
3137 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3138 int runtime_visible_annotations_length,
3139 u1* runtime_invisible_annotations,
3140 int runtime_invisible_annotations_length, TRAPS) {
3141 AnnotationArray* annotations = NULL;
3142 if (runtime_visible_annotations != NULL ||
3143 runtime_invisible_annotations != NULL) {
3144 annotations = MetadataFactory::new_array<u1>(_loader_data,
3145 runtime_visible_annotations_length +
3146 runtime_invisible_annotations_length,
3147 CHECK_(annotations));
3148 if (runtime_visible_annotations != NULL) {
3149 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3150 annotations->at_put(i, runtime_visible_annotations[i]);
3151 }
3152 }
3153 if (runtime_invisible_annotations != NULL) {
3154 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3155 int append = runtime_visible_annotations_length+i;
3156 annotations->at_put(append, runtime_invisible_annotations[i]);
3157 }
3158 }
3159 }
3160 return annotations;
3161 }
3162
3163 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3164 TRAPS) {
3165 instanceKlassHandle super_klass;
3166 if (super_class_index == 0) {
3167 check_property(_class_name == vmSymbols::java_lang_Object(),
3168 "Invalid superclass index %u in class file %s",
3169 super_class_index,
3170 CHECK_NULL);
3171 } else {
3172 check_property(valid_klass_reference_at(super_class_index),
3173 "Invalid superclass index %u in class file %s",
3174 super_class_index,
3175 CHECK_NULL);
3176 // The class name should be legal because it is checked when parsing constant pool.
3177 // However, make sure it is not an array type.
3178 bool is_array = false;
3179 if (_cp->tag_at(super_class_index).is_klass()) {
3180 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3181 if (_need_verify)
3182 is_array = super_klass->oop_is_array();
3183 } else if (_need_verify) {
3184 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3185 }
3186 if (_need_verify) {
3187 guarantee_property(!is_array,
3188 "Bad superclass name in class file %s", CHECK_NULL);
3189 }
3190 }
3191 return super_klass;
3192 }
3193
3194
3195 // Values needed for oopmap and InstanceKlass creation
3196 class FieldLayoutInfo : public StackObj {
3197 public:
3198 int* nonstatic_oop_offsets;
3199 unsigned int* nonstatic_oop_counts;
3200 unsigned int nonstatic_oop_map_count;
3201 unsigned int total_oop_map_count;
3202 int instance_size;
3203 int nonstatic_field_size;
3204 int static_field_size;
3205 bool has_nonstatic_fields;
3206 };
3207
3208 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3209 void ClassFileParser::layout_fields(Handle class_loader,
3210 FieldAllocationCount* fac,
3211 ClassAnnotationCollector* parsed_annotations,
3212 FieldLayoutInfo* info,
3213 TRAPS) {
3214
3215 // Field size and offset computation
3216 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3217 int next_static_oop_offset;
3218 int next_static_double_offset;
3219 int next_static_word_offset;
3220 int next_static_short_offset;
3221 int next_static_byte_offset;
3222 int next_nonstatic_oop_offset;
3223 int next_nonstatic_double_offset;
3224 int next_nonstatic_word_offset;
3225 int next_nonstatic_short_offset;
3226 int next_nonstatic_byte_offset;
3227 int first_nonstatic_oop_offset;
3228 int next_nonstatic_field_offset;
3229 int next_nonstatic_padded_offset;
3230
3231 // Count the contended fields by type.
3232 //
3233 // We ignore static fields, because @Contended is not supported for them.
3234 // The layout code below will also ignore the static fields.
3235 int nonstatic_contended_count = 0;
3236 FieldAllocationCount fac_contended;
3237 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3238 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3239 if (fs.is_contended()) {
3240 fac_contended.count[atype]++;
3241 if (!fs.access_flags().is_static()) {
3242 nonstatic_contended_count++;
3243 }
3244 }
3245 }
3246
3247
3248 // Calculate the starting byte offsets
3249 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3250 next_static_double_offset = next_static_oop_offset +
3251 ((fac->count[STATIC_OOP]) * heapOopSize);
3252 if ( fac->count[STATIC_DOUBLE] &&
3253 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3254 Universe::field_type_should_be_aligned(T_LONG)) ) {
3255 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3256 }
3257
3258 next_static_word_offset = next_static_double_offset +
3259 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3260 next_static_short_offset = next_static_word_offset +
3261 ((fac->count[STATIC_WORD]) * BytesPerInt);
3262 next_static_byte_offset = next_static_short_offset +
3263 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3264
3265 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3266 nonstatic_field_size * heapOopSize;
3267
3268 next_nonstatic_field_offset = nonstatic_fields_start;
3269
3270 bool is_contended_class = parsed_annotations->is_contended();
3271
3272 // Class is contended, pad before all the fields
3273 if (is_contended_class) {
3274 next_nonstatic_field_offset += ContendedPaddingWidth;
3275 }
3276
3277 // Compute the non-contended fields count.
3278 // The packing code below relies on these counts to determine if some field
3279 // can be squeezed into the alignment gap. Contended fields are obviously
3280 // exempt from that.
3281 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3282 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3283 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3284 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3285 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3286
3287 // Total non-static fields count, including every contended field
3288 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3289 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3290 fac->count[NONSTATIC_OOP];
3291
3292 bool super_has_nonstatic_fields =
3293 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3294 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3295
3296
3297 // Prepare list of oops for oop map generation.
3298 //
3299 // "offset" and "count" lists are describing the set of contiguous oop
3300 // regions. offset[i] is the start of the i-th region, which then has
3301 // count[i] oops following. Before we know how many regions are required,
3302 // we pessimistically allocate the maps to fit all the oops into the
3303 // distinct regions.
3304 //
3305 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3306 // to figure out if we still need to do this.
3307 int* nonstatic_oop_offsets;
3308 unsigned int* nonstatic_oop_counts;
3309 unsigned int nonstatic_oop_map_count = 0;
3310 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3311
3312 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3313 THREAD, int, max_nonstatic_oop_maps);
3314 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3315 THREAD, unsigned int, max_nonstatic_oop_maps);
3316
3317 first_nonstatic_oop_offset = 0; // will be set for first oop field
3318
3319 bool compact_fields = CompactFields;
3320 int allocation_style = FieldsAllocationStyle;
3321 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3322 assert(false, "0 <= FieldsAllocationStyle <= 2");
3323 allocation_style = 1; // Optimistic
3324 }
3325
3326 // The next classes have predefined hard-coded fields offsets
3327 // (see in JavaClasses::compute_hard_coded_offsets()).
3328 // Use default fields allocation order for them.
3329 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3330 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3331 _class_name == vmSymbols::java_lang_Class() ||
3332 _class_name == vmSymbols::java_lang_ClassLoader() ||
3333 _class_name == vmSymbols::java_lang_ref_Reference() ||
3334 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3335 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3336 _class_name == vmSymbols::java_lang_String() ||
3337 _class_name == vmSymbols::java_lang_Throwable() ||
3338 _class_name == vmSymbols::java_lang_Boolean() ||
3339 _class_name == vmSymbols::java_lang_Character() ||
3340 _class_name == vmSymbols::java_lang_Float() ||
3341 _class_name == vmSymbols::java_lang_Double() ||
3342 _class_name == vmSymbols::java_lang_Byte() ||
3343 _class_name == vmSymbols::java_lang_Short() ||
3344 _class_name == vmSymbols::java_lang_Integer() ||
3345 _class_name == vmSymbols::java_lang_Long())) {
3346 allocation_style = 0; // Allocate oops first
3347 compact_fields = false; // Don't compact fields
3348 }
3349
3350 // Rearrange fields for a given allocation style
3351 if( allocation_style == 0 ) {
3352 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3353 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3354 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3355 (nonstatic_oop_count * heapOopSize);
3356 } else if( allocation_style == 1 ) {
3357 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3358 next_nonstatic_double_offset = next_nonstatic_field_offset;
3359 } else if( allocation_style == 2 ) {
3360 // Fields allocation: oops fields in super and sub classes are together.
3361 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3362 _super_klass->nonstatic_oop_map_size() > 0 ) {
3363 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3364 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3365 OopMapBlock* last_map = first_map + map_count - 1;
3366 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3367 if (next_offset == next_nonstatic_field_offset) {
3368 allocation_style = 0; // allocate oops first
3369 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3370 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3371 (nonstatic_oop_count * heapOopSize);
3372 }
3373 }
3374 if( allocation_style == 2 ) {
3375 allocation_style = 1; // allocate oops last
3376 next_nonstatic_double_offset = next_nonstatic_field_offset;
3377 }
3378 } else {
3379 ShouldNotReachHere();
3380 }
3381
3382 int nonstatic_oop_space_count = 0;
3383 int nonstatic_word_space_count = 0;
3384 int nonstatic_short_space_count = 0;
3385 int nonstatic_byte_space_count = 0;
3386 int nonstatic_oop_space_offset;
3387 int nonstatic_word_space_offset;
3388 int nonstatic_short_space_offset;
3389 int nonstatic_byte_space_offset;
3390
3391 // Try to squeeze some of the fields into the gaps due to
3392 // long/double alignment.
3393 if( nonstatic_double_count > 0 ) {
3394 int offset = next_nonstatic_double_offset;
3395 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3396 if( compact_fields && offset != next_nonstatic_double_offset ) {
3397 // Allocate available fields into the gap before double field.
3398 int length = next_nonstatic_double_offset - offset;
3399 assert(length == BytesPerInt, "");
3400 nonstatic_word_space_offset = offset;
3401 if( nonstatic_word_count > 0 ) {
3402 nonstatic_word_count -= 1;
3403 nonstatic_word_space_count = 1; // Only one will fit
3404 length -= BytesPerInt;
3405 offset += BytesPerInt;
3406 }
3407 nonstatic_short_space_offset = offset;
3408 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3409 nonstatic_short_count -= 1;
3410 nonstatic_short_space_count += 1;
3411 length -= BytesPerShort;
3412 offset += BytesPerShort;
3413 }
3414 nonstatic_byte_space_offset = offset;
3415 while( length > 0 && nonstatic_byte_count > 0 ) {
3416 nonstatic_byte_count -= 1;
3417 nonstatic_byte_space_count += 1;
3418 length -= 1;
3419 }
3420 // Allocate oop field in the gap if there are no other fields for that.
3421 nonstatic_oop_space_offset = offset;
3422 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3423 allocation_style != 0 ) { // when oop fields not first
3424 nonstatic_oop_count -= 1;
3425 nonstatic_oop_space_count = 1; // Only one will fit
3426 length -= heapOopSize;
3427 offset += heapOopSize;
3428 }
3429 }
3430 }
3431
3432 next_nonstatic_word_offset = next_nonstatic_double_offset +
3433 (nonstatic_double_count * BytesPerLong);
3434 next_nonstatic_short_offset = next_nonstatic_word_offset +
3435 (nonstatic_word_count * BytesPerInt);
3436 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3437 (nonstatic_short_count * BytesPerShort);
3438 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3439 nonstatic_byte_count;
3440
3441 // let oops jump before padding with this allocation style
3442 if( allocation_style == 1 ) {
3443 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3444 if( nonstatic_oop_count > 0 ) {
3445 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3446 }
3447 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3448 }
3449
3450 // Iterate over fields again and compute correct offsets.
3451 // The field allocation type was temporarily stored in the offset slot.
3452 // oop fields are located before non-oop fields (static and non-static).
3453 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3454
3455 // skip already laid out fields
3456 if (fs.is_offset_set()) continue;
3457
3458 // contended instance fields are handled below
3459 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3460
3461 int real_offset;
3462 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3463
3464 // pack the rest of the fields
3465 switch (atype) {
3466 case STATIC_OOP:
3467 real_offset = next_static_oop_offset;
3468 next_static_oop_offset += heapOopSize;
3469 break;
3470 case STATIC_BYTE:
3471 real_offset = next_static_byte_offset;
3472 next_static_byte_offset += 1;
3473 break;
3474 case STATIC_SHORT:
3475 real_offset = next_static_short_offset;
3476 next_static_short_offset += BytesPerShort;
3477 break;
3478 case STATIC_WORD:
3479 real_offset = next_static_word_offset;
3480 next_static_word_offset += BytesPerInt;
3481 break;
3482 case STATIC_DOUBLE:
3483 real_offset = next_static_double_offset;
3484 next_static_double_offset += BytesPerLong;
3485 break;
3486 case NONSTATIC_OOP:
3487 if( nonstatic_oop_space_count > 0 ) {
3488 real_offset = nonstatic_oop_space_offset;
3489 nonstatic_oop_space_offset += heapOopSize;
3490 nonstatic_oop_space_count -= 1;
3491 } else {
3492 real_offset = next_nonstatic_oop_offset;
3493 next_nonstatic_oop_offset += heapOopSize;
3494 }
3495
3496 // Record this oop in the oop maps
3497 if( nonstatic_oop_map_count > 0 &&
3498 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3499 real_offset -
3500 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3501 heapOopSize ) {
3502 // This oop is adjacent to the previous one, add to current oop map
3503 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3504 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3505 } else {
3506 // This oop is not adjacent to the previous one, create new oop map
3507 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3508 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3509 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3510 nonstatic_oop_map_count += 1;
3511 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3512 first_nonstatic_oop_offset = real_offset;
3513 }
3514 }
3515 break;
3516 case NONSTATIC_BYTE:
3517 if( nonstatic_byte_space_count > 0 ) {
3518 real_offset = nonstatic_byte_space_offset;
3519 nonstatic_byte_space_offset += 1;
3520 nonstatic_byte_space_count -= 1;
3521 } else {
3522 real_offset = next_nonstatic_byte_offset;
3523 next_nonstatic_byte_offset += 1;
3524 }
3525 break;
3526 case NONSTATIC_SHORT:
3527 if( nonstatic_short_space_count > 0 ) {
3528 real_offset = nonstatic_short_space_offset;
3529 nonstatic_short_space_offset += BytesPerShort;
3530 nonstatic_short_space_count -= 1;
3531 } else {
3532 real_offset = next_nonstatic_short_offset;
3533 next_nonstatic_short_offset += BytesPerShort;
3534 }
3535 break;
3536 case NONSTATIC_WORD:
3537 if( nonstatic_word_space_count > 0 ) {
3538 real_offset = nonstatic_word_space_offset;
3539 nonstatic_word_space_offset += BytesPerInt;
3540 nonstatic_word_space_count -= 1;
3541 } else {
3542 real_offset = next_nonstatic_word_offset;
3543 next_nonstatic_word_offset += BytesPerInt;
3544 }
3545 break;
3546 case NONSTATIC_DOUBLE:
3547 real_offset = next_nonstatic_double_offset;
3548 next_nonstatic_double_offset += BytesPerLong;
3549 break;
3550 default:
3551 ShouldNotReachHere();
3552 }
3553 fs.set_offset(real_offset);
3554 }
3555
3556
3557 // Handle the contended cases.
3558 //
3559 // Each contended field should not intersect the cache line with another contended field.
3560 // In the absence of alignment information, we end up with pessimistically separating
3561 // the fields with full-width padding.
3562 //
3563 // Additionally, this should not break alignment for the fields, so we round the alignment up
3564 // for each field.
3565 if (nonstatic_contended_count > 0) {
3566
3567 // if there is at least one contended field, we need to have pre-padding for them
3568 next_nonstatic_padded_offset += ContendedPaddingWidth;
3569
3570 // collect all contended groups
3571 BitMap bm(_cp->size());
3572 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3573 // skip already laid out fields
3574 if (fs.is_offset_set()) continue;
3575
3576 if (fs.is_contended()) {
3577 bm.set_bit(fs.contended_group());
3578 }
3579 }
3580
3581 int current_group = -1;
3582 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3583
3584 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3585
3586 // skip already laid out fields
3587 if (fs.is_offset_set()) continue;
3588
3589 // skip non-contended fields and fields from different group
3590 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3591
3592 // handle statics below
3593 if (fs.access_flags().is_static()) continue;
3594
3595 int real_offset;
3596 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3597
3598 switch (atype) {
3599 case NONSTATIC_BYTE:
3600 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3601 real_offset = next_nonstatic_padded_offset;
3602 next_nonstatic_padded_offset += 1;
3603 break;
3604
3605 case NONSTATIC_SHORT:
3606 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3607 real_offset = next_nonstatic_padded_offset;
3608 next_nonstatic_padded_offset += BytesPerShort;
3609 break;
3610
3611 case NONSTATIC_WORD:
3612 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3613 real_offset = next_nonstatic_padded_offset;
3614 next_nonstatic_padded_offset += BytesPerInt;
3615 break;
3616
3617 case NONSTATIC_DOUBLE:
3618 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3619 real_offset = next_nonstatic_padded_offset;
3620 next_nonstatic_padded_offset += BytesPerLong;
3621 break;
3622
3623 case NONSTATIC_OOP:
3624 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3625 real_offset = next_nonstatic_padded_offset;
3626 next_nonstatic_padded_offset += heapOopSize;
3627
3628 // Record this oop in the oop maps
3629 if( nonstatic_oop_map_count > 0 &&
3630 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3631 real_offset -
3632 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3633 heapOopSize ) {
3634 // This oop is adjacent to the previous one, add to current oop map
3635 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3636 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3637 } else {
3638 // This oop is not adjacent to the previous one, create new oop map
3639 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3640 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3641 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3642 nonstatic_oop_map_count += 1;
3643 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3644 first_nonstatic_oop_offset = real_offset;
3645 }
3646 }
3647 break;
3648
3649 default:
3650 ShouldNotReachHere();
3651 }
3652
3653 if (fs.contended_group() == 0) {
3654 // Contended group defines the equivalence class over the fields:
3655 // the fields within the same contended group are not inter-padded.
3656 // The only exception is default group, which does not incur the
3657 // equivalence, and so requires intra-padding.
3658 next_nonstatic_padded_offset += ContendedPaddingWidth;
3659 }
3660
3661 fs.set_offset(real_offset);
3662 } // for
3663
3664 // Start laying out the next group.
3665 // Note that this will effectively pad the last group in the back;
3666 // this is expected to alleviate memory contention effects for
3667 // subclass fields and/or adjacent object.
3668 // If this was the default group, the padding is already in place.
3669 if (current_group != 0) {
3670 next_nonstatic_padded_offset += ContendedPaddingWidth;
3671 }
3672 }
3673
3674 // handle static fields
3675 }
3676
3677 // Entire class is contended, pad in the back.
3678 // This helps to alleviate memory contention effects for subclass fields
3679 // and/or adjacent object.
3680 if (is_contended_class) {
3681 next_nonstatic_padded_offset += ContendedPaddingWidth;
3682 }
3683
3684 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3685
3686 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3687 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3688 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3689
3690 int static_field_size = (static_fields_end -
3691 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3692 nonstatic_field_size = nonstatic_field_size +
3693 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3694
3695 int instance_size = align_object_size(instance_end / wordSize);
3696
3697 assert(instance_size == align_object_size(align_size_up(
3698 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3699 wordSize) / wordSize), "consistent layout helper value");
3700
3701 // Invariant: nonstatic_field end/start should only change if there are
3702 // nonstatic fields in the class, or if the class is contended. We compare
3703 // against the non-aligned value, so that end alignment will not fail the
3704 // assert without actually having the fields.
3705 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3706 is_contended_class ||
3707 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3708
3709 // Number of non-static oop map blocks allocated at end of klass.
3710 const unsigned int total_oop_map_count =
3711 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3712 first_nonstatic_oop_offset);
3713
3714 #ifndef PRODUCT
3715 if (PrintFieldLayout) {
3716 print_field_layout(_class_name,
3717 _fields,
3718 _cp,
3719 instance_size,
3720 nonstatic_fields_start,
3721 nonstatic_fields_end,
3722 static_fields_end);
3723 }
3724
3725 #endif
3726 // Pass back information needed for InstanceKlass creation
3727 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3728 info->nonstatic_oop_counts = nonstatic_oop_counts;
3729 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3730 info->total_oop_map_count = total_oop_map_count;
3731 info->instance_size = instance_size;
3732 info->static_field_size = static_field_size;
3733 info->nonstatic_field_size = nonstatic_field_size;
3734 info->has_nonstatic_fields = has_nonstatic_fields;
3735 }
3736
3737
3738 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3739 ClassLoaderData* loader_data,
3740 Handle protection_domain,
3741 KlassHandle host_klass,
3742 GrowableArray<Handle>* cp_patches,
3743 TempNewSymbol& parsed_name,
3744 bool verify,
3745 TRAPS) {
3746
3747 // When a retransformable agent is attached, JVMTI caches the
3748 // class bytes that existed before the first retransformation.
3749 // If RedefineClasses() was used before the retransformable
3750 // agent attached, then the cached class bytes may not be the
3751 // original class bytes.
3752 JvmtiCachedClassFileData *cached_class_file = NULL;
3753 Handle class_loader(THREAD, loader_data->class_loader());
3754 bool has_default_methods = false;
3755 bool declares_default_methods = false;
3756 ResourceMark rm(THREAD);
3757
3758 ClassFileStream* cfs = stream();
3759 // Timing
3760 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3761 JavaThread* jt = (JavaThread*) THREAD;
3762
3763 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3764 ClassLoader::perf_class_parse_selftime(),
3765 NULL,
3766 jt->get_thread_stat()->perf_recursion_counts_addr(),
3767 jt->get_thread_stat()->perf_timers_addr(),
3768 PerfClassTraceTime::PARSE_CLASS);
3769
3770 init_parsed_class_attributes(loader_data);
3771
3772 if (JvmtiExport::should_post_class_file_load_hook()) {
3773 // Get the cached class file bytes (if any) from the class that
3774 // is being redefined or retransformed. We use jvmti_thread_state()
3775 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3776 // a JvmtiThreadState any earlier than necessary. This will help
3777 // avoid the bug described by 7126851.
3778 JvmtiThreadState *state = jt->jvmti_thread_state();
3779 if (state != NULL) {
3780 KlassHandle *h_class_being_redefined =
3781 state->get_class_being_redefined();
3782 if (h_class_being_redefined != NULL) {
3783 instanceKlassHandle ikh_class_being_redefined =
3784 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3785 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3786 }
3787 }
3788
3789 unsigned char* ptr = cfs->buffer();
3790 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3791
3792 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3793 &ptr, &end_ptr, &cached_class_file);
3794
3795 if (ptr != cfs->buffer()) {
3796 // JVMTI agent has modified class file data.
3797 // Set new class file stream using JVMTI agent modified
3798 // class file data.
3799 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3800 set_stream(cfs);
3801 }
3802 }
3803
3804 _host_klass = host_klass;
3805 _cp_patches = cp_patches;
3806
3807 instanceKlassHandle nullHandle;
3808
3809 // Figure out whether we can skip format checking (matching classic VM behavior)
3810 if (DumpSharedSpaces) {
3811 // verify == true means it's a 'remote' class (i.e., non-boot class)
3812 // Verification decision is based on BytecodeVerificationRemote flag
3813 // for those classes.
3814 _need_verify = (verify) ? BytecodeVerificationRemote :
3815 BytecodeVerificationLocal;
3816 } else {
3817 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3818 }
3819
3820 // Set the verify flag in stream
3821 cfs->set_verify(_need_verify);
3822
3823 // Save the class file name for easier error message printing.
3824 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3825
3826 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3827 // Magic value
3828 u4 magic = cfs->get_u4_fast();
3829 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3830 "Incompatible magic value %u in class file %s",
3831 magic, CHECK_(nullHandle));
3832
3833 // Version numbers
3834 u2 minor_version = cfs->get_u2_fast();
3835 u2 major_version = cfs->get_u2_fast();
3836
3837 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3838 ResourceMark rm;
3839 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3840 major_version, minor_version, name->as_C_string());
3841 Exceptions::fthrow(
3842 THREAD_AND_LOCATION,
3843 vmSymbols::java_lang_UnsupportedClassVersionError(),
3844 "Unsupported major.minor version for dump time %u.%u",
3845 major_version,
3846 minor_version);
3847 }
3848
3849 // Check version numbers - we check this even with verifier off
3850 if (!is_supported_version(major_version, minor_version)) {
3851 if (name == NULL) {
3852 Exceptions::fthrow(
3853 THREAD_AND_LOCATION,
3854 vmSymbols::java_lang_UnsupportedClassVersionError(),
3855 "Unsupported class file version %u.%u, "
3856 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3857 major_version,
3858 minor_version,
3859 JAVA_MAX_SUPPORTED_VERSION,
3860 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3861 } else {
3862 ResourceMark rm(THREAD);
3863 Exceptions::fthrow(
3864 THREAD_AND_LOCATION,
3865 vmSymbols::java_lang_UnsupportedClassVersionError(),
3866 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3867 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3868 name->as_C_string(),
3869 major_version,
3870 minor_version,
3871 JAVA_MAX_SUPPORTED_VERSION,
3872 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3873 }
3874 return nullHandle;
3875 }
3876
3877 _major_version = major_version;
3878 _minor_version = minor_version;
3879
3880
3881 // Check if verification needs to be relaxed for this class file
3882 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3883 _relax_verify = Verifier::relax_verify_for(class_loader());
3884
3885 // Constant pool
3886 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3887
3888 int cp_size = cp->length();
3889
3890 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3891
3892 // Access flags
3893 AccessFlags access_flags;
3894 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3895
3896 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3897 // Set abstract bit for old class files for backward compatibility
3898 flags |= JVM_ACC_ABSTRACT;
3899 }
3900 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3901 access_flags.set_flags(flags);
3902
3903 // This class and superclass
3904 u2 this_class_index = cfs->get_u2_fast();
3905 check_property(
3906 valid_cp_range(this_class_index, cp_size) &&
3907 cp->tag_at(this_class_index).is_unresolved_klass(),
3908 "Invalid this class index %u in constant pool in class file %s",
3909 this_class_index, CHECK_(nullHandle));
3910
3911 Symbol* class_name = cp->klass_name_at(this_class_index);
3912 assert(class_name != NULL, "class_name can't be null");
3913
3914 // It's important to set parsed_name *before* resolving the super class.
3915 // (it's used for cleanup by the caller if parsing fails)
3916 parsed_name = class_name;
3917 // parsed_name is returned and can be used if there's an error, so add to
3918 // its reference count. Caller will decrement the refcount.
3919 parsed_name->increment_refcount();
3920
3921 // Update _class_name which could be null previously to be class_name
3922 _class_name = class_name;
3923
3924 // Don't need to check whether this class name is legal or not.
3925 // It has been checked when constant pool is parsed.
3926 // However, make sure it is not an array type.
3927 if (_need_verify) {
3928 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3929 "Bad class name in class file %s",
3930 CHECK_(nullHandle));
3931 }
3932
3933 Klass* preserve_this_klass; // for storing result across HandleMark
3934
3935 // release all handles when parsing is done
3936 { HandleMark hm(THREAD);
3937
3938 // Checks if name in class file matches requested name
3939 if (name != NULL && class_name != name) {
3940 ResourceMark rm(THREAD);
3941 Exceptions::fthrow(
3942 THREAD_AND_LOCATION,
3943 vmSymbols::java_lang_NoClassDefFoundError(),
3944 "%s (wrong name: %s)",
3945 name->as_C_string(),
3946 class_name->as_C_string()
3947 );
3948 return nullHandle;
3949 }
3950
3951 if (TraceClassLoadingPreorder) {
3952 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3953 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3954 tty->print_cr("]");
3955 }
3956 #if INCLUDE_CDS
3957 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3958 // Only dump the classes that can be stored into CDS archive
3959 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3960 if (name != NULL) {
3961 ResourceMark rm(THREAD);
3962 classlist_file->print_cr("%s", name->as_C_string());
3963 classlist_file->flush();
3964 }
3965 }
3966 }
3967 #endif
3968
3969 u2 super_class_index = cfs->get_u2_fast();
3970 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3971 CHECK_NULL);
3972
3973 // Interfaces
3974 u2 itfs_len = cfs->get_u2_fast();
3975 Array<Klass*>* local_interfaces =
3976 parse_interfaces(itfs_len, protection_domain, _class_name,
3977 &has_default_methods, CHECK_(nullHandle));
3978
3979 u2 java_fields_count = 0;
3980 // Fields (offsets are filled in later)
3981 FieldAllocationCount fac;
3982 Array<u2>* fields = parse_fields(class_name,
3983 access_flags.is_interface(),
3984 &fac, &java_fields_count,
3985 CHECK_(nullHandle));
3986 // Methods
3987 bool has_final_method = false;
3988 AccessFlags promoted_flags;
3989 promoted_flags.set_flags(0);
3990 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3991 &promoted_flags,
3992 &has_final_method,
3993 &declares_default_methods,
3994 CHECK_(nullHandle));
3995
3996 if (declares_default_methods) {
3997 has_default_methods = true;
3998 }
3999
4000 // Additional attributes
4001 ClassAnnotationCollector parsed_annotations;
4002 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
4003
4004 // Make sure this is the end of class file stream
4005 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
4006
4007 // We check super class after class file is parsed and format is checked
4008 if (super_class_index > 0 && super_klass.is_null()) {
4009 Symbol* sk = cp->klass_name_at(super_class_index);
4010 if (access_flags.is_interface()) {
4011 // Before attempting to resolve the superclass, check for class format
4012 // errors not checked yet.
4013 guarantee_property(sk == vmSymbols::java_lang_Object(),
4014 "Interfaces must have java.lang.Object as superclass in class file %s",
4015 CHECK_(nullHandle));
4016 }
4017 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4018 class_loader,
4019 protection_domain,
4020 true,
4021 CHECK_(nullHandle));
4022
4023 KlassHandle kh (THREAD, k);
4024 super_klass = instanceKlassHandle(THREAD, kh());
4025 }
4026 if (super_klass.not_null()) {
4027
4028 if (super_klass->has_default_methods()) {
4029 has_default_methods = true;
4030 }
4031
4032 if (super_klass->is_interface()) {
4033 ResourceMark rm(THREAD);
4034 Exceptions::fthrow(
4035 THREAD_AND_LOCATION,
4036 vmSymbols::java_lang_IncompatibleClassChangeError(),
4037 "class %s has interface %s as super class",
4038 class_name->as_klass_external_name(),
4039 super_klass->external_name()
4040 );
4041 return nullHandle;
4042 }
4043 // Make sure super class is not final
4044 if (super_klass->is_final()) {
4045 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4046 }
4047 }
4048
4049 // save super klass for error handling.
4050 _super_klass = super_klass;
4051
4052 // Compute the transitive list of all unique interfaces implemented by this class
4053 _transitive_interfaces =
4054 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4055
4056 // sort methods
4057 intArray* method_ordering = sort_methods(methods);
4058
4059 // promote flags from parse_methods() to the klass' flags
4060 access_flags.add_promoted_flags(promoted_flags.as_int());
4061
4062 // Size of Java vtable (in words)
4063 int vtable_size = 0;
4064 int itable_size = 0;
4065 int num_miranda_methods = 0;
4066
4067 GrowableArray<Method*> all_mirandas(20);
4068
4069 klassVtable::compute_vtable_size_and_num_mirandas(
4070 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4071 access_flags, class_loader, class_name, local_interfaces,
4072 CHECK_(nullHandle));
4073
4074 // Size of Java itable (in words)
4075 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4076
4077 FieldLayoutInfo info;
4078 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4079
4080 int total_oop_map_size2 =
4081 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4082
4083 // Compute reference type
4084 ReferenceType rt;
4085 if (super_klass() == NULL) {
4086 rt = REF_NONE;
4087 } else {
4088 rt = super_klass->reference_type();
4089 }
4090
4091 // We can now create the basic Klass* for this klass
4092 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4093 vtable_size,
4094 itable_size,
4095 info.static_field_size,
4096 total_oop_map_size2,
4097 rt,
4098 access_flags,
4099 name,
4100 super_klass(),
4101 !host_klass.is_null(),
4102 CHECK_(nullHandle));
4103 instanceKlassHandle this_klass (THREAD, _klass);
4104
4105 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4106 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4107 "sanity");
4108
4109 // Fill in information already parsed
4110 this_klass->set_should_verify_class(verify);
4111 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4112 this_klass->set_layout_helper(lh);
4113 assert(this_klass->oop_is_instance(), "layout is correct");
4114 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4115 // Not yet: supers are done below to support the new subtype-checking fields
4116 //this_klass->set_super(super_klass());
4117 this_klass->set_class_loader_data(loader_data);
4118 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4119 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4120 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4121
4122 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4123
4124 if (has_final_method) {
4125 this_klass->set_has_final_method();
4126 }
4127 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4128 // The InstanceKlass::_methods_jmethod_ids cache
4129 // is managed on the assumption that the initial cache
4130 // size is equal to the number of methods in the class. If
4131 // that changes, then InstanceKlass::idnum_can_increment()
4132 // has to be changed accordingly.
4133 this_klass->set_initial_method_idnum(methods->length());
4134 this_klass->set_name(cp->klass_name_at(this_class_index));
4135 if (is_anonymous()) // I am well known to myself
4136 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4137
4138 this_klass->set_minor_version(minor_version);
4139 this_klass->set_major_version(major_version);
4140 this_klass->set_has_default_methods(has_default_methods);
4141 this_klass->set_declares_default_methods(declares_default_methods);
4142
4143 if (!host_klass.is_null()) {
4144 assert (this_klass->is_anonymous(), "should be the same");
4145 this_klass->set_host_klass(host_klass());
4146 }
4147
4148 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4149 // (We used to do this lazily, but now we query it in Rewriter,
4150 // which is eagerly done for every method, so we might as well do it now,
4151 // when everything is fresh in memory.)
4152 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4153 for (int j = 0; j < methods->length(); j++) {
4154 methods->at(j)->init_intrinsic_id();
4155 }
4156 }
4157
4158 if (cached_class_file != NULL) {
4159 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4160 this_klass->set_cached_class_file(cached_class_file);
4161 }
4162
4163 // Fill in field values obtained by parse_classfile_attributes
4164 if (parsed_annotations.has_any_annotations())
4165 parsed_annotations.apply_to(this_klass);
4166 apply_parsed_class_attributes(this_klass);
4167
4168 // Miranda methods
4169 if ((num_miranda_methods > 0) ||
4170 // if this class introduced new miranda methods or
4171 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4172 // super class exists and this class inherited miranda methods
4173 ) {
4174 this_klass->set_has_miranda_methods(); // then set a flag
4175 }
4176
4177 // Fill in information needed to compute superclasses.
4178 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4179
4180 // Initialize itable offset tables
4181 klassItable::setup_itable_offset_table(this_klass);
4182
4183 // Compute transitive closure of interfaces this class implements
4184 // Do final class setup
4185 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4186
4187 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4188 set_precomputed_flags(this_klass);
4189
4190 // reinitialize modifiers, using the InnerClasses attribute
4191 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4192 this_klass->set_modifier_flags(computed_modifiers);
4193
4194 // check if this class can access its super class
4195 check_super_class_access(this_klass, CHECK_(nullHandle));
4196
4197 // check if this class can access its superinterfaces
4198 check_super_interface_access(this_klass, CHECK_(nullHandle));
4199
4200 // check if this class overrides any final method
4201 check_final_method_override(this_klass, CHECK_(nullHandle));
4202
4203 // check that if this class is an interface then it doesn't have static methods
4204 if (this_klass->is_interface()) {
4205 /* An interface in a JAVA 8 classfile can be static */
4206 if (_major_version < JAVA_8_VERSION) {
4207 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4208 }
4209 }
4210
4211 // Allocate mirror and initialize static fields
4212 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4213 CHECK_(nullHandle));
4214
4215 // Generate any default methods - default methods are interface methods
4216 // that have a default implementation. This is new with Lambda project.
4217 if (has_default_methods ) {
4218 DefaultMethods::generate_default_methods(
4219 this_klass(), &all_mirandas, CHECK_(nullHandle));
4220 }
4221
4222 // Update the loader_data graph.
4223 record_defined_class_dependencies(this_klass, CHECK_NULL);
4224
4225 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4226 false /* not shared class */);
4227
4228 if (TraceClassLoading) {
4229 ResourceMark rm;
4230 // print in a single call to reduce interleaving of output
4231 if (cfs->source() != NULL) {
4232 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4233 cfs->source());
4234 } else if (class_loader.is_null()) {
4235 Klass* caller =
4236 THREAD->is_Java_thread()
4237 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4238 : NULL;
4239 // caller can be NULL, for example, during a JVMTI VM_Init hook
4240 if (caller != NULL) {
4241 tty->print("[Loaded %s by instance of %s]\n",
4242 this_klass->external_name(),
4243 InstanceKlass::cast(caller)->external_name());
4244 } else {
4245 tty->print("[Loaded %s]\n", this_klass->external_name());
4246 }
4247 } else {
4248 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4249 InstanceKlass::cast(class_loader->klass())->external_name());
4250 }
4251 }
4252
4253 if (TraceClassResolution) {
4254 ResourceMark rm;
4255 // print out the superclass.
4256 const char * from = this_klass()->external_name();
4257 if (this_klass->java_super() != NULL) {
4258 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4259 }
4260 // print out each of the interface classes referred to by this class.
4261 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4262 if (local_interfaces != NULL) {
4263 int length = local_interfaces->length();
4264 for (int i = 0; i < length; i++) {
4265 Klass* k = local_interfaces->at(i);
4266 InstanceKlass* to_class = InstanceKlass::cast(k);
4267 const char * to = to_class->external_name();
4268 tty->print("RESOLVE %s %s (interface)\n", from, to);
4269 }
4270 }
4271 }
4272
4273 // preserve result across HandleMark
4274 preserve_this_klass = this_klass();
4275 }
4276
4277 // Create new handle outside HandleMark (might be needed for
4278 // Extended Class Redefinition)
4279 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4280 debug_only(this_klass->verify();)
4281
4282 // Clear class if no error has occurred so destructor doesn't deallocate it
4283 _klass = NULL;
4284 return this_klass;
4285 }
4286
4287 // Destructor to clean up if there's an error
4288 ClassFileParser::~ClassFileParser() {
4289 MetadataFactory::free_metadata(_loader_data, _cp);
4290 MetadataFactory::free_array<u2>(_loader_data, _fields);
4291
4292 // Free methods
4293 InstanceKlass::deallocate_methods(_loader_data, _methods);
4294
4295 // beware of the Universe::empty_blah_array!!
4296 if (_inner_classes != Universe::the_empty_short_array()) {
4297 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4298 }
4299
4300 // Free interfaces
4301 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4302 _local_interfaces, _transitive_interfaces);
4303
4304 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4305 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4306 Annotations::free_contents(_loader_data, _fields_annotations);
4307 Annotations::free_contents(_loader_data, _fields_type_annotations);
4308
4309 clear_class_metadata();
4310
4311 // deallocate the klass if already created. Don't directly deallocate, but add
4312 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4313 // at a safepoint.
4314 if (_klass != NULL) {
4315 _loader_data->add_to_deallocate_list(_klass);
4316 }
4317 _klass = NULL;
4318 }
4319
4320 void ClassFileParser::print_field_layout(Symbol* name,
4321 Array<u2>* fields,
4322 constantPoolHandle cp,
4323 int instance_size,
4324 int instance_fields_start,
4325 int instance_fields_end,
4326 int static_fields_end) {
4327 tty->print("%s: field layout\n", name->as_klass_external_name());
4328 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4329 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4330 if (!fs.access_flags().is_static()) {
4331 tty->print(" @%3d \"%s\" %s\n",
4332 fs.offset(),
4333 fs.name()->as_klass_external_name(),
4334 fs.signature()->as_klass_external_name());
4335 }
4336 }
4337 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4338 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4339 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4340 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4341 if (fs.access_flags().is_static()) {
4342 tty->print(" @%3d \"%s\" %s\n",
4343 fs.offset(),
4344 fs.name()->as_klass_external_name(),
4345 fs.signature()->as_klass_external_name());
4346 }
4347 }
4348 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4349 tty->print("\n");
4350 }
4351
4352 unsigned int
4353 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4354 unsigned int nonstatic_oop_map_count,
4355 int first_nonstatic_oop_offset) {
4356 unsigned int map_count =
4357 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4358 if (nonstatic_oop_map_count > 0) {
4359 // We have oops to add to map
4360 if (map_count == 0) {
4361 map_count = nonstatic_oop_map_count;
4362 } else {
4363 // Check whether we should add a new map block or whether the last one can
4364 // be extended
4365 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4366 OopMapBlock* const last_map = first_map + map_count - 1;
4367
4368 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4369 if (next_offset == first_nonstatic_oop_offset) {
4370 // There is no gap bettwen superklass's last oop field and first
4371 // local oop field, merge maps.
4372 nonstatic_oop_map_count -= 1;
4373 } else {
4374 // Superklass didn't end with a oop field, add extra maps
4375 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4376 }
4377 map_count += nonstatic_oop_map_count;
4378 }
4379 }
4380 return map_count;
4381 }
4382
4383
4384 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4385 unsigned int nonstatic_oop_map_count,
4386 int* nonstatic_oop_offsets,
4387 unsigned int* nonstatic_oop_counts) {
4388 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4389 const InstanceKlass* const super = k->superklass();
4390 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4391 if (super_count > 0) {
4392 // Copy maps from superklass
4393 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4394 for (unsigned int i = 0; i < super_count; ++i) {
4395 *this_oop_map++ = *super_oop_map++;
4396 }
4397 }
4398
4399 if (nonstatic_oop_map_count > 0) {
4400 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4401 // The counts differ because there is no gap between superklass's last oop
4402 // field and the first local oop field. Extend the last oop map copied
4403 // from the superklass instead of creating new one.
4404 nonstatic_oop_map_count--;
4405 nonstatic_oop_offsets++;
4406 this_oop_map--;
4407 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4408 this_oop_map++;
4409 }
4410
4411 // Add new map blocks, fill them
4412 while (nonstatic_oop_map_count-- > 0) {
4413 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4414 this_oop_map->set_count(*nonstatic_oop_counts++);
4415 this_oop_map++;
4416 }
4417 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4418 this_oop_map, "sanity");
4419 }
4420 }
4421
4422
4423 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4424 Klass* super = k->super();
4425
4426 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4427 // in which case we don't have to register objects as finalizable
4428 if (!_has_empty_finalizer) {
4429 if (_has_finalizer ||
4430 (super != NULL && super->has_finalizer())) {
4431 k->set_has_finalizer();
4432 }
4433 }
4434
4435 #ifdef ASSERT
4436 bool f = false;
4437 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4438 vmSymbols::void_method_signature());
4439 if (m != NULL && !m->is_empty_method()) {
4440 f = true;
4441 }
4442
4443 // Spec doesn't prevent agent from redefinition of empty finalizer.
4444 // Despite the fact that it's generally bad idea and redefined finalizer
4445 // will not work as expected we shouldn't abort vm in this case
4446 if (!k->has_redefined_this_or_super()) {
4447 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4448 }
4449 #endif
4450
4451 // Check if this klass supports the java.lang.Cloneable interface
4452 if (SystemDictionary::Cloneable_klass_loaded()) {
4453 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4454 k->set_is_cloneable();
4455 }
4456 }
4457
4458 // Check if this klass has a vanilla default constructor
4459 if (super == NULL) {
4460 // java.lang.Object has empty default constructor
4461 k->set_has_vanilla_constructor();
4462 } else {
4463 if (super->has_vanilla_constructor() &&
4464 _has_vanilla_constructor) {
4465 k->set_has_vanilla_constructor();
4466 }
4467 #ifdef ASSERT
4468 bool v = false;
4469 if (super->has_vanilla_constructor()) {
4470 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4471 ), vmSymbols::void_method_signature());
4472 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4473 v = true;
4474 }
4475 }
4476 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4477 #endif
4478 }
4479
4480 // If it cannot be fast-path allocated, set a bit in the layout helper.
4481 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4482 assert(k->size_helper() > 0, "layout_helper is initialized");
4483 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4484 || k->is_abstract() || k->is_interface()
4485 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4486 || k->size_helper() >= FastAllocateSizeLimit) {
4487 // Forbid fast-path allocation.
4488 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4489 k->set_layout_helper(lh);
4490 }
4491 }
4492
4493 // Attach super classes and interface classes to class loader data
4494 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4495 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4496 if (defining_loader_data->is_the_null_class_loader_data()) {
4497 // Dependencies to null class loader data are implicit.
4498 return;
4499 } else {
4500 // add super class dependency
4501 Klass* super = defined_klass->super();
4502 if (super != NULL) {
4503 defining_loader_data->record_dependency(super, CHECK);
4504 }
4505
4506 // add super interface dependencies
4507 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4508 if (local_interfaces != NULL) {
4509 int length = local_interfaces->length();
4510 for (int i = 0; i < length; i++) {
4511 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4512 }
4513 }
4514 }
4515 }
4516
4517 // utility methods for appending an array with check for duplicates
4518
4519 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4520 // iterate over new interfaces
4521 for (int i = 0; i < ifs->length(); i++) {
4522 Klass* e = ifs->at(i);
4523 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4524 // add new interface
4525 result->append_if_missing(e);
4526 }
4527 }
4528
4529 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4530 instanceKlassHandle super,
4531 Array<Klass*>* local_ifs, TRAPS) {
4532 // Compute maximum size for transitive interfaces
4533 int max_transitive_size = 0;
4534 int super_size = 0;
4535 // Add superclass transitive interfaces size
4536 if (super.not_null()) {
4537 super_size = super->transitive_interfaces()->length();
4538 max_transitive_size += super_size;
4539 }
4540 // Add local interfaces' super interfaces
4541 int local_size = local_ifs->length();
4542 for (int i = 0; i < local_size; i++) {
4543 Klass* l = local_ifs->at(i);
4544 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4545 }
4546 // Finally add local interfaces
4547 max_transitive_size += local_size;
4548 // Construct array
4549 if (max_transitive_size == 0) {
4550 // no interfaces, use canonicalized array
4551 return Universe::the_empty_klass_array();
4552 } else if (max_transitive_size == super_size) {
4553 // no new local interfaces added, share superklass' transitive interface array
4554 return super->transitive_interfaces();
4555 } else if (max_transitive_size == local_size) {
4556 // only local interfaces added, share local interface array
4557 return local_ifs;
4558 } else {
4559 ResourceMark rm;
4560 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4561
4562 // Copy down from superclass
4563 if (super.not_null()) {
4564 append_interfaces(result, super->transitive_interfaces());
4565 }
4566
4567 // Copy down from local interfaces' superinterfaces
4568 for (int i = 0; i < local_ifs->length(); i++) {
4569 Klass* l = local_ifs->at(i);
4570 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4571 }
4572 // Finally add local interfaces
4573 append_interfaces(result, local_ifs);
4574
4575 // length will be less than the max_transitive_size if duplicates were removed
4576 int length = result->length();
4577 assert(length <= max_transitive_size, "just checking");
4578 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4579 for (int i = 0; i < length; i++) {
4580 Klass* e = result->at(i);
4581 assert(e != NULL, "just checking");
4582 new_result->at_put(i, e);
4583 }
4584 return new_result;
4585 }
4586 }
4587
4588 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4589 Klass* super = this_klass->super();
4590 if ((super != NULL) &&
4591 (!Reflection::verify_class_access(this_klass(), super, false))) {
4592 ResourceMark rm(THREAD);
4593 Exceptions::fthrow(
4594 THREAD_AND_LOCATION,
4595 vmSymbols::java_lang_IllegalAccessError(),
4596 "class %s cannot access its superclass %s",
4597 this_klass->external_name(),
4598 InstanceKlass::cast(super)->external_name()
4599 );
4600 return;
4601 }
4602 }
4603
4604
4605 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4606 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4607 int lng = local_interfaces->length();
4608 for (int i = lng - 1; i >= 0; i--) {
4609 Klass* k = local_interfaces->at(i);
4610 assert (k != NULL && k->is_interface(), "invalid interface");
4611 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4612 ResourceMark rm(THREAD);
4613 Exceptions::fthrow(
4614 THREAD_AND_LOCATION,
4615 vmSymbols::java_lang_IllegalAccessError(),
4616 "class %s cannot access its superinterface %s",
4617 this_klass->external_name(),
4618 InstanceKlass::cast(k)->external_name()
4619 );
4620 return;
4621 }
4622 }
4623 }
4624
4625
4626 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4627 Array<Method*>* methods = this_klass->methods();
4628 int num_methods = methods->length();
4629
4630 // go thru each method and check if it overrides a final method
4631 for (int index = 0; index < num_methods; index++) {
4632 Method* m = methods->at(index);
4633
4634 // skip private, static, and <init> methods
4635 if ((!m->is_private() && !m->is_static()) &&
4636 (m->name() != vmSymbols::object_initializer_name())) {
4637
4638 Symbol* name = m->name();
4639 Symbol* signature = m->signature();
4640 Klass* k = this_klass->super();
4641 Method* super_m = NULL;
4642 while (k != NULL) {
4643 // skip supers that don't have final methods.
4644 if (k->has_final_method()) {
4645 // lookup a matching method in the super class hierarchy
4646 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4647 if (super_m == NULL) {
4648 break; // didn't find any match; get out
4649 }
4650
4651 if (super_m->is_final() && !super_m->is_static() &&
4652 // matching method in super is final, and not static
4653 (Reflection::verify_field_access(this_klass(),
4654 super_m->method_holder(),
4655 super_m->method_holder(),
4656 super_m->access_flags(), false))
4657 // this class can access super final method and therefore override
4658 ) {
4659 ResourceMark rm(THREAD);
4660 Exceptions::fthrow(
4661 THREAD_AND_LOCATION,
4662 vmSymbols::java_lang_VerifyError(),
4663 "class %s overrides final method %s.%s%s",
4664 this_klass->external_name(),
4665 super_m->method_holder()->external_name(),
4666 name->as_C_string(),
4667 signature->as_C_string()
4668 );
4669 return;
4670 }
4671
4672 // continue to look from super_m's holder's super.
4673 k = super_m->method_holder()->super();
4674 continue;
4675 }
4676
4677 k = k->super();
4678 }
4679 }
4680 }
4681 }
4682
4683
4684 // assumes that this_klass is an interface
4685 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4686 assert(this_klass->is_interface(), "not an interface");
4687 Array<Method*>* methods = this_klass->methods();
4688 int num_methods = methods->length();
4689
4690 for (int index = 0; index < num_methods; index++) {
4691 Method* m = methods->at(index);
4692 // if m is static and not the init method, throw a verify error
4693 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4694 ResourceMark rm(THREAD);
4695 Exceptions::fthrow(
4696 THREAD_AND_LOCATION,
4697 vmSymbols::java_lang_VerifyError(),
4698 "Illegal static method %s in interface %s",
4699 m->name()->as_C_string(),
4700 this_klass->external_name()
4701 );
4702 return;
4703 }
4704 }
4705 }
4706
4707 // utility methods for format checking
4708
4709 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4710 if (!_need_verify) { return; }
4711
4712 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4713 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4714 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4715 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4716 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4717 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4718 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4719
4720 if ((is_abstract && is_final) ||
4721 (is_interface && !is_abstract) ||
4722 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4723 (!is_interface && major_gte_15 && is_annotation)) {
4724 ResourceMark rm(THREAD);
4725 Exceptions::fthrow(
4726 THREAD_AND_LOCATION,
4727 vmSymbols::java_lang_ClassFormatError(),
4728 "Illegal class modifiers in class %s: 0x%X",
4729 _class_name->as_C_string(), flags
4730 );
4731 return;
4732 }
4733 }
4734
4735 bool ClassFileParser::has_illegal_visibility(jint flags) {
4736 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4737 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4738 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4739
4740 return ((is_public && is_protected) ||
4741 (is_public && is_private) ||
4742 (is_protected && is_private));
4743 }
4744
4745 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4746 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4747 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4748 (major <= max_version) &&
4749 ((major != max_version) ||
4750 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4751 }
4752
4753 void ClassFileParser::verify_legal_field_modifiers(
4754 jint flags, bool is_interface, TRAPS) {
4755 if (!_need_verify) { return; }
4756
4757 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4758 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4759 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4760 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4761 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4762 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4763 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4764 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4765 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4766
4767 bool is_illegal = false;
4768
4769 if (is_interface) {
4770 if (!is_public || !is_static || !is_final || is_private ||
4771 is_protected || is_volatile || is_transient ||
4772 (major_gte_15 && is_enum)) {
4773 is_illegal = true;
4774 }
4775 } else { // not interface
4776 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4777 is_illegal = true;
4778 }
4779 }
4780
4781 if (is_illegal) {
4782 ResourceMark rm(THREAD);
4783 Exceptions::fthrow(
4784 THREAD_AND_LOCATION,
4785 vmSymbols::java_lang_ClassFormatError(),
4786 "Illegal field modifiers in class %s: 0x%X",
4787 _class_name->as_C_string(), flags);
4788 return;
4789 }
4790 }
4791
4792 void ClassFileParser::verify_legal_method_modifiers(
4793 jint flags, bool is_interface, Symbol* name, TRAPS) {
4794 if (!_need_verify) { return; }
4795
4796 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4797 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4798 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4799 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4800 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4801 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4802 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4803 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4804 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4805 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4806 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4807 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4808 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4809
4810 bool is_illegal = false;
4811
4812 if (is_interface) {
4813 if (major_gte_8) {
4814 // Class file version is JAVA_8_VERSION or later Methods of
4815 // interfaces may set any of the flags except ACC_PROTECTED,
4816 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4817 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4818 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4819 (is_native || is_protected || is_final || is_synchronized) ||
4820 // If a specific method of a class or interface has its
4821 // ACC_ABSTRACT flag set, it must not have any of its
4822 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4823 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4824 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4825 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4826 (is_abstract && (is_private || is_static || is_strict))) {
4827 is_illegal = true;
4828 }
4829 } else if (major_gte_15) {
4830 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4831 if (!is_public || is_static || is_final || is_synchronized ||
4832 is_native || !is_abstract || is_strict) {
4833 is_illegal = true;
4834 }
4835 } else {
4836 // Class file version is pre-JAVA_1_5_VERSION
4837 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4838 is_illegal = true;
4839 }
4840 }
4841 } else { // not interface
4842 if (is_initializer) {
4843 if (is_static || is_final || is_synchronized || is_native ||
4844 is_abstract || (major_gte_15 && is_bridge)) {
4845 is_illegal = true;
4846 }
4847 } else { // not initializer
4848 if (is_abstract) {
4849 if ((is_final || is_native || is_private || is_static ||
4850 (major_gte_15 && (is_synchronized || is_strict)))) {
4851 is_illegal = true;
4852 }
4853 }
4854 if (has_illegal_visibility(flags)) {
4855 is_illegal = true;
4856 }
4857 }
4858 }
4859
4860 if (is_illegal) {
4861 ResourceMark rm(THREAD);
4862 Exceptions::fthrow(
4863 THREAD_AND_LOCATION,
4864 vmSymbols::java_lang_ClassFormatError(),
4865 "Method %s in class %s has illegal modifiers: 0x%X",
4866 name->as_C_string(), _class_name->as_C_string(), flags);
4867 return;
4868 }
4869 }
4870
4871 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4872 assert(_need_verify, "only called when _need_verify is true");
4873 int i = 0;
4874 int count = length >> 2;
4875 for (int k=0; k<count; k++) {
4876 unsigned char b0 = buffer[i];
4877 unsigned char b1 = buffer[i+1];
4878 unsigned char b2 = buffer[i+2];
4879 unsigned char b3 = buffer[i+3];
4880 // For an unsigned char v,
4881 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4882 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4883 unsigned char res = b0 | b0 - 1 |
4884 b1 | b1 - 1 |
4885 b2 | b2 - 1 |
4886 b3 | b3 - 1;
4887 if (res >= 128) break;
4888 i += 4;
4889 }
4890 for(; i < length; i++) {
4891 unsigned short c;
4892 // no embedded zeros
4893 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4894 if(buffer[i] < 128) {
4895 continue;
4896 }
4897 if ((i + 5) < length) { // see if it's legal supplementary character
4898 if (UTF8::is_supplementary_character(&buffer[i])) {
4899 c = UTF8::get_supplementary_character(&buffer[i]);
4900 i += 5;
4901 continue;
4902 }
4903 }
4904 switch (buffer[i] >> 4) {
4905 default: break;
4906 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4907 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4908 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4909 c = (buffer[i] & 0x1F) << 6;
4910 i++;
4911 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4912 c += buffer[i] & 0x3F;
4913 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4914 // for classes with major > 47, c must a null or a character in its shortest form
4915 break;
4916 }
4917 }
4918 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4919 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4920 c = (buffer[i] & 0xF) << 12;
4921 i += 2;
4922 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4923 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4924 if (_major_version <= 47 || c >= 0x800) {
4925 // for classes with major > 47, c must be in its shortest form
4926 break;
4927 }
4928 }
4929 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4930 } // end of switch
4931 } // end of for
4932 }
4933
4934 // Checks if name is a legal class name.
4935 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4936 if (!_need_verify || _relax_verify) { return; }
4937
4938 char buf[fixed_buffer_size];
4939 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4940 unsigned int length = name->utf8_length();
4941 bool legal = false;
4942
4943 if (length > 0) {
4944 char* p;
4945 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4946 p = skip_over_field_signature(bytes, false, length, CHECK);
4947 legal = (p != NULL) && ((p - bytes) == (int)length);
4948 } else if (_major_version < JAVA_1_5_VERSION) {
4949 if (bytes[0] != '<') {
4950 p = skip_over_field_name(bytes, true, length);
4951 legal = (p != NULL) && ((p - bytes) == (int)length);
4952 }
4953 } else {
4954 // 4900761: relax the constraints based on JSR202 spec
4955 // Class names may be drawn from the entire Unicode character set.
4956 // Identifiers between '/' must be unqualified names.
4957 // The utf8 string has been verified when parsing cpool entries.
4958 legal = verify_unqualified_name(bytes, length, LegalClass);
4959 }
4960 }
4961 if (!legal) {
4962 ResourceMark rm(THREAD);
4963 Exceptions::fthrow(
4964 THREAD_AND_LOCATION,
4965 vmSymbols::java_lang_ClassFormatError(),
4966 "Illegal class name \"%s\" in class file %s", bytes,
4967 _class_name->as_C_string()
4968 );
4969 return;
4970 }
4971 }
4972
4973 // Checks if name is a legal field name.
4974 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4975 if (!_need_verify || _relax_verify) { return; }
4976
4977 char buf[fixed_buffer_size];
4978 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4979 unsigned int length = name->utf8_length();
4980 bool legal = false;
4981
4982 if (length > 0) {
4983 if (_major_version < JAVA_1_5_VERSION) {
4984 if (bytes[0] != '<') {
4985 char* p = skip_over_field_name(bytes, false, length);
4986 legal = (p != NULL) && ((p - bytes) == (int)length);
4987 }
4988 } else {
4989 // 4881221: relax the constraints based on JSR202 spec
4990 legal = verify_unqualified_name(bytes, length, LegalField);
4991 }
4992 }
4993
4994 if (!legal) {
4995 ResourceMark rm(THREAD);
4996 Exceptions::fthrow(
4997 THREAD_AND_LOCATION,
4998 vmSymbols::java_lang_ClassFormatError(),
4999 "Illegal field name \"%s\" in class %s", bytes,
5000 _class_name->as_C_string()
5001 );
5002 return;
5003 }
5004 }
5005
5006 // Checks if name is a legal method name.
5007 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5008 if (!_need_verify || _relax_verify) { return; }
5009
5010 assert(name != NULL, "method name is null");
5011 char buf[fixed_buffer_size];
5012 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5013 unsigned int length = name->utf8_length();
5014 bool legal = false;
5015
5016 if (length > 0) {
5017 if (bytes[0] == '<') {
5018 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5019 legal = true;
5020 }
5021 } else if (_major_version < JAVA_1_5_VERSION) {
5022 char* p;
5023 p = skip_over_field_name(bytes, false, length);
5024 legal = (p != NULL) && ((p - bytes) == (int)length);
5025 } else {
5026 // 4881221: relax the constraints based on JSR202 spec
5027 legal = verify_unqualified_name(bytes, length, LegalMethod);
5028 }
5029 }
5030
5031 if (!legal) {
5032 ResourceMark rm(THREAD);
5033 Exceptions::fthrow(
5034 THREAD_AND_LOCATION,
5035 vmSymbols::java_lang_ClassFormatError(),
5036 "Illegal method name \"%s\" in class %s", bytes,
5037 _class_name->as_C_string()
5038 );
5039 return;
5040 }
5041 }
5042
5043
5044 // Checks if signature is a legal field signature.
5045 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5046 if (!_need_verify) { return; }
5047
5048 char buf[fixed_buffer_size];
5049 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5050 unsigned int length = signature->utf8_length();
5051 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5052
5053 if (p == NULL || (p - bytes) != (int)length) {
5054 throwIllegalSignature("Field", name, signature, CHECK);
5055 }
5056 }
5057
5058 // Checks if signature is a legal method signature.
5059 // Returns number of parameters
5060 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5061 if (!_need_verify) {
5062 // make sure caller's args_size will be less than 0 even for non-static
5063 // method so it will be recomputed in compute_size_of_parameters().
5064 return -2;
5065 }
5066
5067 unsigned int args_size = 0;
5068 char buf[fixed_buffer_size];
5069 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5070 unsigned int length = signature->utf8_length();
5071 char* nextp;
5072
5073 // The first character must be a '('
5074 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5075 length--;
5076 // Skip over legal field signatures
5077 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5078 while ((length > 0) && (nextp != NULL)) {
5079 args_size++;
5080 if (p[0] == 'J' || p[0] == 'D') {
5081 args_size++;
5082 }
5083 length -= nextp - p;
5084 p = nextp;
5085 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5086 }
5087 // The first non-signature thing better be a ')'
5088 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5089 length--;
5090 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5091 // All internal methods must return void
5092 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5093 return args_size;
5094 }
5095 } else {
5096 // Now we better just have a return value
5097 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5098 if (nextp && ((int)length == (nextp - p))) {
5099 return args_size;
5100 }
5101 }
5102 }
5103 }
5104 // Report error
5105 throwIllegalSignature("Method", name, signature, CHECK_0);
5106 return 0;
5107 }
5108
5109
5110 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5111 // Method names also may not contain the characters '<' or '>', unless <init>
5112 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5113 // method. Because these names have been checked as special cases before
5114 // calling this method in verify_legal_method_name.
5115 bool ClassFileParser::verify_unqualified_name(
5116 char* name, unsigned int length, int type) {
5117 jchar ch;
5118
5119 for (char* p = name; p != name + length; ) {
5120 ch = *p;
5121 if (ch < 128) {
5122 p++;
5123 if (ch == '.' || ch == ';' || ch == '[' ) {
5124 return false; // do not permit '.', ';', or '['
5125 }
5126 if (type != LegalClass && ch == '/') {
5127 return false; // do not permit '/' unless it's class name
5128 }
5129 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5130 return false; // do not permit '<' or '>' in method names
5131 }
5132 } else {
5133 char* tmp_p = UTF8::next(p, &ch);
5134 p = tmp_p;
5135 }
5136 }
5137 return true;
5138 }
5139
5140
5141 // Take pointer to a string. Skip over the longest part of the string that could
5142 // be taken as a fieldname. Allow '/' if slash_ok is true.
5143 // Return a pointer to just past the fieldname.
5144 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5145 // being true, we saw consecutive slashes (meaning we were looking for a
5146 // qualified path but found something that was badly-formed).
5147 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5148 char* p;
5149 jchar ch;
5150 jboolean last_is_slash = false;
5151 jboolean not_first_ch = false;
5152
5153 for (p = name; p != name + length; not_first_ch = true) {
5154 char* old_p = p;
5155 ch = *p;
5156 if (ch < 128) {
5157 p++;
5158 // quick check for ascii
5159 if ((ch >= 'a' && ch <= 'z') ||
5160 (ch >= 'A' && ch <= 'Z') ||
5161 (ch == '_' || ch == '$') ||
5162 (not_first_ch && ch >= '0' && ch <= '9')) {
5163 last_is_slash = false;
5164 continue;
5165 }
5166 if (slash_ok && ch == '/') {
5167 if (last_is_slash) {
5168 return NULL; // Don't permit consecutive slashes
5169 }
5170 last_is_slash = true;
5171 continue;
5172 }
5173 } else {
5174 jint unicode_ch;
5175 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5176 p = tmp_p;
5177 last_is_slash = false;
5178 // Check if ch is Java identifier start or is Java identifier part
5179 // 4672820: call java.lang.Character methods directly without generating separate tables.
5180 EXCEPTION_MARK;
5181 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5182
5183 // return value
5184 JavaValue result(T_BOOLEAN);
5185 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5186 JavaCallArguments args;
5187 args.push_int(unicode_ch);
5188
5189 // public static boolean isJavaIdentifierStart(char ch);
5190 JavaCalls::call_static(&result,
5191 klass,
5192 vmSymbols::isJavaIdentifierStart_name(),
5193 vmSymbols::int_bool_signature(),
5194 &args,
5195 THREAD);
5196
5197 if (HAS_PENDING_EXCEPTION) {
5198 CLEAR_PENDING_EXCEPTION;
5199 return 0;
5200 }
5201 if (result.get_jboolean()) {
5202 continue;
5203 }
5204
5205 if (not_first_ch) {
5206 // public static boolean isJavaIdentifierPart(char ch);
5207 JavaCalls::call_static(&result,
5208 klass,
5209 vmSymbols::isJavaIdentifierPart_name(),
5210 vmSymbols::int_bool_signature(),
5211 &args,
5212 THREAD);
5213
5214 if (HAS_PENDING_EXCEPTION) {
5215 CLEAR_PENDING_EXCEPTION;
5216 return 0;
5217 }
5218
5219 if (result.get_jboolean()) {
5220 continue;
5221 }
5222 }
5223 }
5224 return (not_first_ch) ? old_p : NULL;
5225 }
5226 return (not_first_ch) ? p : NULL;
5227 }
5228
5229
5230 // Take pointer to a string. Skip over the longest part of the string that could
5231 // be taken as a field signature. Allow "void" if void_ok.
5232 // Return a pointer to just past the signature.
5233 // Return NULL if no legal signature is found.
5234 char* ClassFileParser::skip_over_field_signature(char* signature,
5235 bool void_ok,
5236 unsigned int length,
5237 TRAPS) {
5238 unsigned int array_dim = 0;
5239 while (length > 0) {
5240 switch (signature[0]) {
5241 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5242 case JVM_SIGNATURE_BOOLEAN:
5243 case JVM_SIGNATURE_BYTE:
5244 case JVM_SIGNATURE_CHAR:
5245 case JVM_SIGNATURE_SHORT:
5246 case JVM_SIGNATURE_INT:
5247 case JVM_SIGNATURE_FLOAT:
5248 case JVM_SIGNATURE_LONG:
5249 case JVM_SIGNATURE_DOUBLE:
5250 return signature + 1;
5251 case JVM_SIGNATURE_CLASS: {
5252 if (_major_version < JAVA_1_5_VERSION) {
5253 // Skip over the class name if one is there
5254 char* p = skip_over_field_name(signature + 1, true, --length);
5255
5256 // The next character better be a semicolon
5257 if (p && (p - signature) > 1 && p[0] == ';') {
5258 return p + 1;
5259 }
5260 } else {
5261 // 4900761: For class version > 48, any unicode is allowed in class name.
5262 length--;
5263 signature++;
5264 while (length > 0 && signature[0] != ';') {
5265 if (signature[0] == '.') {
5266 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5267 }
5268 length--;
5269 signature++;
5270 }
5271 if (signature[0] == ';') { return signature + 1; }
5272 }
5273
5274 return NULL;
5275 }
5276 case JVM_SIGNATURE_ARRAY:
5277 array_dim++;
5278 if (array_dim > 255) {
5279 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5280 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5281 }
5282 // The rest of what's there better be a legal signature
5283 signature++;
5284 length--;
5285 void_ok = false;
5286 break;
5287
5288 default:
5289 return NULL;
5290 }
5291 }
5292 return NULL;
5293 }