1 /*
2 * Copyright (c) 1997, 2019, 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 "trace/traceMacros.hpp"
65 #include "utilities/array.hpp"
66 #include "utilities/globalDefinitions.hpp"
67 #include "utilities/ostream.hpp"
68
69 // We generally try to create the oops directly when parsing, rather than
70 // allocating temporary data structures and copying the bytes twice. A
71 // temporary area is only needed when parsing utf8 entries in the constant
72 // pool and when parsing line number tables.
73
74 // We add assert in debug mode when class format is not checked.
75
76 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
77 #define JAVA_MIN_SUPPORTED_VERSION 45
78 #define JAVA_MAX_SUPPORTED_VERSION 52
79 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
80
81 // Used for two backward compatibility reasons:
82 // - to check for new additions to the class file format in JDK1.5
83 // - to check for bug fixes in the format checker in JDK1.5
84 #define JAVA_1_5_VERSION 49
85
86 // Used for backward compatibility reasons:
87 // - to check for javac bug fixes that happened after 1.5
88 // - also used as the max version when running in jdk6
89 #define JAVA_6_VERSION 50
90
91 // Used for backward compatibility reasons:
92 // - to check NameAndType_info signatures more aggressively
93 #define JAVA_7_VERSION 51
94
95 // Extension method support.
96 #define JAVA_8_VERSION 52
97
98 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
99 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
100 // this function (_current can be allocated in a register, with scalar
101 // replacement of aggregates). The _current pointer is copied back to
102 // stream() when this function returns. DON'T call another method within
103 // this method that uses stream().
104 ClassFileStream* cfs0 = stream();
105 ClassFileStream cfs1 = *cfs0;
106 ClassFileStream* cfs = &cfs1;
107 #ifdef ASSERT
108 assert(cfs->allocated_on_stack(),"should be local");
109 u1* old_current = cfs0->current();
110 #endif
111 Handle class_loader(THREAD, _loader_data->class_loader());
112
113 // Used for batching symbol allocations.
114 const char* names[SymbolTable::symbol_alloc_batch_size];
115 int lengths[SymbolTable::symbol_alloc_batch_size];
116 int indices[SymbolTable::symbol_alloc_batch_size];
117 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
118 int names_count = 0;
119
120 // parsing Index 0 is unused
121 for (int index = 1; index < length; index++) {
122 // Each of the following case guarantees one more byte in the stream
123 // for the following tag or the access_flags following constant pool,
124 // so we don't need bounds-check for reading tag.
125 u1 tag = cfs->get_u1_fast();
126 switch (tag) {
127 case JVM_CONSTANT_Class :
128 {
129 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
130 u2 name_index = cfs->get_u2_fast();
131 _cp->klass_index_at_put(index, name_index);
132 }
133 break;
134 case JVM_CONSTANT_Fieldref :
135 {
136 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
137 u2 class_index = cfs->get_u2_fast();
138 u2 name_and_type_index = cfs->get_u2_fast();
139 _cp->field_at_put(index, class_index, name_and_type_index);
140 }
141 break;
142 case JVM_CONSTANT_Methodref :
143 {
144 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
145 u2 class_index = cfs->get_u2_fast();
146 u2 name_and_type_index = cfs->get_u2_fast();
147 _cp->method_at_put(index, class_index, name_and_type_index);
148 }
149 break;
150 case JVM_CONSTANT_InterfaceMethodref :
151 {
152 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
153 u2 class_index = cfs->get_u2_fast();
154 u2 name_and_type_index = cfs->get_u2_fast();
155 _cp->interface_method_at_put(index, class_index, name_and_type_index);
156 }
157 break;
158 case JVM_CONSTANT_String :
159 {
160 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
161 u2 string_index = cfs->get_u2_fast();
162 _cp->string_index_at_put(index, string_index);
163 }
164 break;
165 case JVM_CONSTANT_MethodHandle :
166 case JVM_CONSTANT_MethodType :
167 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
168 classfile_parse_error(
169 "Class file version does not support constant tag %u in class file %s",
170 tag, CHECK);
171 }
172 if (!EnableInvokeDynamic) {
173 classfile_parse_error(
174 "This JVM does not support constant tag %u in class file %s",
175 tag, CHECK);
176 }
177 if (tag == JVM_CONSTANT_MethodHandle) {
178 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
179 u1 ref_kind = cfs->get_u1_fast();
180 u2 method_index = cfs->get_u2_fast();
181 _cp->method_handle_index_at_put(index, ref_kind, method_index);
182 } else if (tag == JVM_CONSTANT_MethodType) {
183 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
184 u2 signature_index = cfs->get_u2_fast();
185 _cp->method_type_index_at_put(index, signature_index);
186 } else {
187 ShouldNotReachHere();
188 }
189 break;
190 case JVM_CONSTANT_InvokeDynamic :
191 {
192 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
193 classfile_parse_error(
194 "Class file version does not support constant tag %u in class file %s",
195 tag, CHECK);
196 }
197 if (!EnableInvokeDynamic) {
198 classfile_parse_error(
199 "This JVM does not support constant tag %u in class file %s",
200 tag, CHECK);
201 }
202 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
203 u2 bootstrap_specifier_index = cfs->get_u2_fast();
204 u2 name_and_type_index = cfs->get_u2_fast();
205 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
206 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
207 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
208 }
209 break;
210 case JVM_CONSTANT_Integer :
211 {
212 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
213 u4 bytes = cfs->get_u4_fast();
214 _cp->int_at_put(index, (jint) bytes);
215 }
216 break;
217 case JVM_CONSTANT_Float :
218 {
219 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
220 u4 bytes = cfs->get_u4_fast();
221 _cp->float_at_put(index, *(jfloat*)&bytes);
222 }
223 break;
224 case JVM_CONSTANT_Long :
225 // A mangled type might cause you to overrun allocated memory
226 guarantee_property(index+1 < length,
227 "Invalid constant pool entry %u in class file %s",
228 index, CHECK);
229 {
230 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
231 u8 bytes = cfs->get_u8_fast();
232 _cp->long_at_put(index, bytes);
233 }
234 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
235 break;
236 case JVM_CONSTANT_Double :
237 // A mangled type might cause you to overrun allocated memory
238 guarantee_property(index+1 < length,
239 "Invalid constant pool entry %u in class file %s",
240 index, CHECK);
241 {
242 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
243 u8 bytes = cfs->get_u8_fast();
244 _cp->double_at_put(index, *(jdouble*)&bytes);
245 }
246 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
247 break;
248 case JVM_CONSTANT_NameAndType :
249 {
250 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
251 u2 name_index = cfs->get_u2_fast();
252 u2 signature_index = cfs->get_u2_fast();
253 _cp->name_and_type_at_put(index, name_index, signature_index);
254 }
255 break;
256 case JVM_CONSTANT_Utf8 :
257 {
258 cfs->guarantee_more(2, CHECK); // utf8_length
259 u2 utf8_length = cfs->get_u2_fast();
260 u1* utf8_buffer = cfs->get_u1_buffer();
261 assert(utf8_buffer != NULL, "null utf8 buffer");
262 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
263 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
264 cfs->skip_u1_fast(utf8_length);
265
266 // Before storing the symbol, make sure it's legal
267 if (_need_verify) {
268 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
269 }
270
271 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
272 Handle patch = clear_cp_patch_at(index);
273 guarantee_property(java_lang_String::is_instance(patch()),
274 "Illegal utf8 patch at %d in class file %s",
275 index, CHECK);
276 char* str = java_lang_String::as_utf8_string(patch());
277 // (could use java_lang_String::as_symbol instead, but might as well batch them)
278 utf8_buffer = (u1*) str;
279 utf8_length = (u2) strlen(str);
280 }
281
282 unsigned int hash;
283 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
284 if (result == NULL) {
285 names[names_count] = (char*)utf8_buffer;
286 lengths[names_count] = utf8_length;
287 indices[names_count] = index;
288 hashValues[names_count++] = hash;
289 if (names_count == SymbolTable::symbol_alloc_batch_size) {
290 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
291 names_count = 0;
292 }
293 } else {
294 _cp->symbol_at_put(index, result);
295 }
296 }
297 break;
298 default:
299 classfile_parse_error(
300 "Unknown constant tag %u in class file %s", tag, CHECK);
301 break;
302 }
303 }
304
305 // Allocate the remaining symbols
306 if (names_count > 0) {
307 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
308 }
309
310 // Copy _current pointer of local copy back to stream().
311 #ifdef ASSERT
312 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
313 #endif
314 cfs0->set_current(cfs1.current());
315 }
316
317 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
318
319 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
320 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
321 return cp->symbol_at(index);
322 else
323 return NULL;
324 }
325
326 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
327 ClassFileStream* cfs = stream();
328 constantPoolHandle nullHandle;
329
330 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
331 u2 length = cfs->get_u2_fast();
332 guarantee_property(
333 length >= 1, "Illegal constant pool size %u in class file %s",
334 length, CHECK_(nullHandle));
335 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
336 CHECK_(nullHandle));
337 _cp = constant_pool; // save in case of errors
338 constantPoolHandle cp (THREAD, constant_pool);
339
340 // parsing constant pool entries
341 parse_constant_pool_entries(length, CHECK_(nullHandle));
342
343 int index = 1; // declared outside of loops for portability
344
345 // first verification pass - validate cross references and fixup class and string constants
346 for (index = 1; index < length; index++) { // Index 0 is unused
347 jbyte tag = cp->tag_at(index).value();
348 switch (tag) {
349 case JVM_CONSTANT_Class :
350 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
351 break;
352 case JVM_CONSTANT_Fieldref :
353 // fall through
354 case JVM_CONSTANT_Methodref :
355 // fall through
356 case JVM_CONSTANT_InterfaceMethodref : {
357 if (!_need_verify) break;
358 int klass_ref_index = cp->klass_ref_index_at(index);
359 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
360 check_property(valid_klass_reference_at(klass_ref_index),
361 "Invalid constant pool index %u in class file %s",
362 klass_ref_index,
363 CHECK_(nullHandle));
364 check_property(valid_cp_range(name_and_type_ref_index, length) &&
365 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
366 "Invalid constant pool index %u in class file %s",
367 name_and_type_ref_index,
368 CHECK_(nullHandle));
369 break;
370 }
371 case JVM_CONSTANT_String :
372 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
373 break;
374 case JVM_CONSTANT_Integer :
375 break;
376 case JVM_CONSTANT_Float :
377 break;
378 case JVM_CONSTANT_Long :
379 case JVM_CONSTANT_Double :
380 index++;
381 check_property(
382 (index < length && cp->tag_at(index).is_invalid()),
383 "Improper constant pool long/double index %u in class file %s",
384 index, CHECK_(nullHandle));
385 break;
386 case JVM_CONSTANT_NameAndType : {
387 if (!_need_verify) break;
388 int name_ref_index = cp->name_ref_index_at(index);
389 int signature_ref_index = cp->signature_ref_index_at(index);
390 check_property(valid_symbol_at(name_ref_index),
391 "Invalid constant pool index %u in class file %s",
392 name_ref_index, CHECK_(nullHandle));
393 check_property(valid_symbol_at(signature_ref_index),
394 "Invalid constant pool index %u in class file %s",
395 signature_ref_index, CHECK_(nullHandle));
396 break;
397 }
398 case JVM_CONSTANT_Utf8 :
399 break;
400 case JVM_CONSTANT_UnresolvedClass : // fall-through
401 case JVM_CONSTANT_UnresolvedClassInError:
402 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
403 break;
404 case JVM_CONSTANT_ClassIndex :
405 {
406 int class_index = cp->klass_index_at(index);
407 check_property(valid_symbol_at(class_index),
408 "Invalid constant pool index %u in class file %s",
409 class_index, CHECK_(nullHandle));
410 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
411 }
412 break;
413 case JVM_CONSTANT_StringIndex :
414 {
415 int string_index = cp->string_index_at(index);
416 check_property(valid_symbol_at(string_index),
417 "Invalid constant pool index %u in class file %s",
418 string_index, CHECK_(nullHandle));
419 Symbol* sym = cp->symbol_at(string_index);
420 cp->unresolved_string_at_put(index, sym);
421 }
422 break;
423 case JVM_CONSTANT_MethodHandle :
424 {
425 int ref_index = cp->method_handle_index_at(index);
426 check_property(
427 valid_cp_range(ref_index, length) &&
428 EnableInvokeDynamic,
429 "Invalid constant pool index %u in class file %s",
430 ref_index, CHECK_(nullHandle));
431 constantTag tag = cp->tag_at(ref_index);
432 int ref_kind = cp->method_handle_ref_kind_at(index);
433 switch (ref_kind) {
434 case JVM_REF_getField:
435 case JVM_REF_getStatic:
436 case JVM_REF_putField:
437 case JVM_REF_putStatic:
438 check_property(
439 tag.is_field(),
440 "Invalid constant pool index %u in class file %s (not a field)",
441 ref_index, CHECK_(nullHandle));
442 break;
443 case JVM_REF_invokeVirtual:
444 case JVM_REF_newInvokeSpecial:
445 check_property(
446 tag.is_method(),
447 "Invalid constant pool index %u in class file %s (not a method)",
448 ref_index, CHECK_(nullHandle));
449 break;
450 case JVM_REF_invokeStatic:
451 case JVM_REF_invokeSpecial:
452 check_property(tag.is_method() ||
453 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
454 "Invalid constant pool index %u in class file %s (not a method)",
455 ref_index, CHECK_(nullHandle));
456 break;
457 case JVM_REF_invokeInterface:
458 check_property(
459 tag.is_interface_method(),
460 "Invalid constant pool index %u in class file %s (not an interface method)",
461 ref_index, CHECK_(nullHandle));
462 break;
463 default:
464 classfile_parse_error(
465 "Bad method handle kind at constant pool index %u in class file %s",
466 index, CHECK_(nullHandle));
467 }
468 // Keep the ref_index unchanged. It will be indirected at link-time.
469 }
470 break;
471 case JVM_CONSTANT_MethodType :
472 {
473 int ref_index = cp->method_type_index_at(index);
474 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
475 "Invalid constant pool index %u in class file %s",
476 ref_index, CHECK_(nullHandle));
477 }
478 break;
479 case JVM_CONSTANT_InvokeDynamic :
480 {
481 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
482 check_property(valid_cp_range(name_and_type_ref_index, length) &&
483 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
484 "Invalid constant pool index %u in class file %s",
485 name_and_type_ref_index,
486 CHECK_(nullHandle));
487 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
488 break;
489 }
490 default:
491 fatal(err_msg("bad constant pool tag value %u",
492 cp->tag_at(index).value()));
493 ShouldNotReachHere();
494 break;
495 } // end of switch
496 } // end of for
497
498 if (_cp_patches != NULL) {
499 // need to treat this_class specially...
500 assert(EnableInvokeDynamic, "");
501 int this_class_index;
502 {
503 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
504 u1* mark = cfs->current();
505 u2 flags = cfs->get_u2_fast();
506 this_class_index = cfs->get_u2_fast();
507 cfs->set_current(mark); // revert to mark
508 }
509
510 for (index = 1; index < length; index++) { // Index 0 is unused
511 if (has_cp_patch_at(index)) {
512 guarantee_property(index != this_class_index,
513 "Illegal constant pool patch to self at %d in class file %s",
514 index, CHECK_(nullHandle));
515 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
516 }
517 }
518 }
519
520 if (!_need_verify) {
521 return cp;
522 }
523
524 // second verification pass - checks the strings are of the right format.
525 // but not yet to the other entries
526 for (index = 1; index < length; index++) {
527 jbyte tag = cp->tag_at(index).value();
528 switch (tag) {
529 case JVM_CONSTANT_UnresolvedClass: {
530 Symbol* class_name = cp->unresolved_klass_at(index);
531 // check the name, even if _cp_patches will overwrite it
532 verify_legal_class_name(class_name, CHECK_(nullHandle));
533 break;
534 }
535 case JVM_CONSTANT_NameAndType: {
536 if (_need_verify && _major_version >= JAVA_7_VERSION) {
537 int sig_index = cp->signature_ref_index_at(index);
538 int name_index = cp->name_ref_index_at(index);
539 Symbol* name = cp->symbol_at(name_index);
540 Symbol* sig = cp->symbol_at(sig_index);
541 guarantee_property(sig->utf8_length() != 0,
542 "Illegal zero length constant pool entry at %d in class %s",
543 sig_index, CHECK_(nullHandle));
544 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
545 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
546 } else {
547 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
548 }
549 }
550 break;
551 }
552 case JVM_CONSTANT_InvokeDynamic:
553 case JVM_CONSTANT_Fieldref:
554 case JVM_CONSTANT_Methodref:
555 case JVM_CONSTANT_InterfaceMethodref: {
556 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
557 // already verified to be utf8
558 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
559 // already verified to be utf8
560 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
561 Symbol* name = cp->symbol_at(name_ref_index);
562 Symbol* signature = cp->symbol_at(signature_ref_index);
563 if (tag == JVM_CONSTANT_Fieldref) {
564 verify_legal_field_name(name, CHECK_(nullHandle));
565 if (_need_verify && _major_version >= JAVA_7_VERSION) {
566 // Signature is verified above, when iterating NameAndType_info.
567 // Need only to be sure it's non-zero length and the right type.
568 if (signature->utf8_length() == 0 ||
569 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
570 throwIllegalSignature(
571 "Field", name, signature, CHECK_(nullHandle));
572 }
573 } else {
574 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
575 }
576 } else {
577 verify_legal_method_name(name, CHECK_(nullHandle));
578 if (_need_verify && _major_version >= JAVA_7_VERSION) {
579 // Signature is verified above, when iterating NameAndType_info.
580 // Need only to be sure it's non-zero length and the right type.
581 if (signature->utf8_length() == 0 ||
582 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
583 throwIllegalSignature(
584 "Method", name, signature, CHECK_(nullHandle));
585 }
586 } else {
587 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
588 }
589 if (tag == JVM_CONSTANT_Methodref) {
590 // 4509014: If a class method name begins with '<', it must be "<init>".
591 assert(name != NULL, "method name in constant pool is null");
592 unsigned int name_len = name->utf8_length();
593 if (name_len != 0 && name->byte_at(0) == '<') {
594 if (name != vmSymbols::object_initializer_name()) {
595 classfile_parse_error(
596 "Bad method name at constant pool index %u in class file %s",
597 name_ref_index, CHECK_(nullHandle));
598 }
599 }
600 }
601 }
602 break;
603 }
604 case JVM_CONSTANT_MethodHandle: {
605 int ref_index = cp->method_handle_index_at(index);
606 int ref_kind = cp->method_handle_ref_kind_at(index);
607 switch (ref_kind) {
608 case JVM_REF_invokeVirtual:
609 case JVM_REF_invokeStatic:
610 case JVM_REF_invokeSpecial:
611 case JVM_REF_newInvokeSpecial:
612 {
613 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
614 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
615 Symbol* name = cp->symbol_at(name_ref_index);
616 if (ref_kind == JVM_REF_newInvokeSpecial) {
617 if (name != vmSymbols::object_initializer_name()) {
618 classfile_parse_error(
619 "Bad constructor name at constant pool index %u in class file %s",
620 name_ref_index, CHECK_(nullHandle));
621 }
622 } else {
623 if (name == vmSymbols::object_initializer_name()) {
624 classfile_parse_error(
625 "Bad method name at constant pool index %u in class file %s",
626 name_ref_index, CHECK_(nullHandle));
627 }
628 }
629 }
630 break;
631 // Other ref_kinds are already fully checked in previous pass.
632 }
633 break;
634 }
635 case JVM_CONSTANT_MethodType: {
636 Symbol* no_name = vmSymbols::type_name(); // place holder
637 Symbol* signature = cp->method_type_signature_at(index);
638 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
639 break;
640 }
641 case JVM_CONSTANT_Utf8: {
642 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
643 }
644 } // end of switch
645 } // end of for
646
647 return cp;
648 }
649
650
651 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
652 assert(EnableInvokeDynamic, "");
653 BasicType patch_type = T_VOID;
654
655 switch (cp->tag_at(index).value()) {
656
657 case JVM_CONSTANT_UnresolvedClass :
658 // Patching a class means pre-resolving it.
659 // The name in the constant pool is ignored.
660 if (java_lang_Class::is_instance(patch())) {
661 guarantee_property(!java_lang_Class::is_primitive(patch()),
662 "Illegal class patch at %d in class file %s",
663 index, CHECK);
664 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
665 } else {
666 guarantee_property(java_lang_String::is_instance(patch()),
667 "Illegal class patch at %d in class file %s",
668 index, CHECK);
669 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
670 cp->unresolved_klass_at_put(index, name);
671 }
672 break;
673
674 case JVM_CONSTANT_String :
675 // skip this patch and don't clear it. Needs the oop array for resolved
676 // references to be created first.
677 return;
678
679 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
680 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
681 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
682 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
683 patch_prim:
684 {
685 jvalue value;
686 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
687 guarantee_property(value_type == patch_type,
688 "Illegal primitive patch at %d in class file %s",
689 index, CHECK);
690 switch (value_type) {
691 case T_INT: cp->int_at_put(index, value.i); break;
692 case T_FLOAT: cp->float_at_put(index, value.f); break;
693 case T_LONG: cp->long_at_put(index, value.j); break;
694 case T_DOUBLE: cp->double_at_put(index, value.d); break;
695 default: assert(false, "");
696 }
697 }
698 break;
699
700 default:
701 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
702 guarantee_property(!has_cp_patch_at(index),
703 "Illegal unexpected patch at %d in class file %s",
704 index, CHECK);
705 return;
706 }
707
708 // On fall-through, mark the patch as used.
709 clear_cp_patch_at(index);
710 }
711
712
713
714 class NameSigHash: public ResourceObj {
715 public:
716 Symbol* _name; // name
717 Symbol* _sig; // signature
718 NameSigHash* _next; // Next entry in hash table
719 };
720
721
722 #define HASH_ROW_SIZE 256
723
724 unsigned int hash(Symbol* name, Symbol* sig) {
725 unsigned int raw_hash = 0;
726 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
727 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
728
729 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
730 }
731
732
733 void initialize_hashtable(NameSigHash** table) {
734 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
735 }
736
737 // Return false if the name/sig combination is found in table.
738 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
739 // The old format checker uses heap sort to find duplicates.
740 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
741 // of table since we don't expect Symbol*'s to move.
742 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
743 assert(name != NULL, "name in constant pool is NULL");
744
745 // First lookup for duplicates
746 int index = hash(name, sig);
747 NameSigHash* entry = table[index];
748 while (entry != NULL) {
749 if (entry->_name == name && entry->_sig == sig) {
750 return false;
751 }
752 entry = entry->_next;
753 }
754
755 // No duplicate is found, allocate a new entry and fill it.
756 entry = new NameSigHash();
757 entry->_name = name;
758 entry->_sig = sig;
759
760 // Insert into hash table
761 entry->_next = table[index];
762 table[index] = entry;
763
764 return true;
765 }
766
767
768 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
769 Handle protection_domain,
770 Symbol* class_name,
771 bool* has_default_methods,
772 TRAPS) {
773 if (length == 0) {
774 _local_interfaces = Universe::the_empty_klass_array();
775 } else {
776 ClassFileStream* cfs = stream();
777 assert(length > 0, "only called for length>0");
778 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
779
780 int index;
781 for (index = 0; index < length; index++) {
782 u2 interface_index = cfs->get_u2(CHECK_NULL);
783 KlassHandle interf;
784 check_property(
785 valid_klass_reference_at(interface_index),
786 "Interface name has bad constant pool index %u in class file %s",
787 interface_index, CHECK_NULL);
788 if (_cp->tag_at(interface_index).is_klass()) {
789 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
790 } else {
791 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
792
793 // Don't need to check legal name because it's checked when parsing constant pool.
794 // But need to make sure it's not an array type.
795 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
796 "Bad interface name in class file %s", CHECK_NULL);
797 Handle class_loader(THREAD, _loader_data->class_loader());
798
799 // Call resolve_super so classcircularity is checked
800 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
801 unresolved_klass, class_loader, protection_domain,
802 false, CHECK_NULL);
803 interf = KlassHandle(THREAD, k);
804 }
805
806 if (!interf()->is_interface()) {
807 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
808 }
809 if (InstanceKlass::cast(interf())->has_default_methods()) {
810 *has_default_methods = true;
811 }
812 _local_interfaces->at_put(index, interf());
813 }
814
815 if (!_need_verify || length <= 1) {
816 return _local_interfaces;
817 }
818
819 // Check if there's any duplicates in interfaces
820 ResourceMark rm(THREAD);
821 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
822 THREAD, NameSigHash*, HASH_ROW_SIZE);
823 initialize_hashtable(interface_names);
824 bool dup = false;
825 Symbol* name = NULL;
826 {
827 debug_only(No_Safepoint_Verifier nsv;)
828 for (index = 0; index < length; index++) {
829 Klass* k = _local_interfaces->at(index);
830 name = InstanceKlass::cast(k)->name();
831 // If no duplicates, add (name, NULL) in hashtable interface_names.
832 if (!put_after_lookup(name, NULL, interface_names)) {
833 dup = true;
834 break;
835 }
836 }
837 }
838 if (dup) {
839 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
840 name->as_C_string(), CHECK_NULL);
841 }
842 }
843 return _local_interfaces;
844 }
845
846
847 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
848 // Make sure the constant pool entry is of a type appropriate to this field
849 guarantee_property(
850 (constantvalue_index > 0 &&
851 constantvalue_index < _cp->length()),
852 "Bad initial value index %u in ConstantValue attribute in class file %s",
853 constantvalue_index, CHECK);
854 constantTag value_type = _cp->tag_at(constantvalue_index);
855 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
856 case T_LONG:
857 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
858 break;
859 case T_FLOAT:
860 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
861 break;
862 case T_DOUBLE:
863 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
864 break;
865 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
866 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
867 break;
868 case T_OBJECT:
869 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
870 && value_type.is_string()),
871 "Bad string initial value in class file %s", CHECK);
872 break;
873 default:
874 classfile_parse_error(
875 "Unable to set initial value %u in class file %s",
876 constantvalue_index, CHECK);
877 }
878 }
879
880
881 // Parse attributes for a field.
882 void ClassFileParser::parse_field_attributes(u2 attributes_count,
883 bool is_static, u2 signature_index,
884 u2* constantvalue_index_addr,
885 bool* is_synthetic_addr,
886 u2* generic_signature_index_addr,
887 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
888 TRAPS) {
889 ClassFileStream* cfs = stream();
890 assert(attributes_count > 0, "length should be greater than 0");
891 u2 constantvalue_index = 0;
892 u2 generic_signature_index = 0;
893 bool is_synthetic = false;
894 u1* runtime_visible_annotations = NULL;
895 int runtime_visible_annotations_length = 0;
896 u1* runtime_invisible_annotations = NULL;
897 int runtime_invisible_annotations_length = 0;
898 u1* runtime_visible_type_annotations = NULL;
899 int runtime_visible_type_annotations_length = 0;
900 u1* runtime_invisible_type_annotations = NULL;
901 int runtime_invisible_type_annotations_length = 0;
902 bool runtime_invisible_type_annotations_exists = false;
903 while (attributes_count--) {
904 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
905 u2 attribute_name_index = cfs->get_u2_fast();
906 u4 attribute_length = cfs->get_u4_fast();
907 check_property(valid_symbol_at(attribute_name_index),
908 "Invalid field attribute index %u in class file %s",
909 attribute_name_index,
910 CHECK);
911 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
912 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
913 // ignore if non-static
914 if (constantvalue_index != 0) {
915 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
916 }
917 check_property(
918 attribute_length == 2,
919 "Invalid ConstantValue field attribute length %u in class file %s",
920 attribute_length, CHECK);
921 constantvalue_index = cfs->get_u2(CHECK);
922 if (_need_verify) {
923 verify_constantvalue(constantvalue_index, signature_index, CHECK);
924 }
925 } else if (attribute_name == vmSymbols::tag_synthetic()) {
926 if (attribute_length != 0) {
927 classfile_parse_error(
928 "Invalid Synthetic field attribute length %u in class file %s",
929 attribute_length, CHECK);
930 }
931 is_synthetic = true;
932 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
933 if (attribute_length != 0) {
934 classfile_parse_error(
935 "Invalid Deprecated field attribute length %u in class file %s",
936 attribute_length, CHECK);
937 }
938 } else if (_major_version >= JAVA_1_5_VERSION) {
939 if (attribute_name == vmSymbols::tag_signature()) {
940 if (attribute_length != 2) {
941 classfile_parse_error(
942 "Wrong size %u for field's Signature attribute in class file %s",
943 attribute_length, CHECK);
944 }
945 generic_signature_index = parse_generic_signature_attribute(CHECK);
946 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
947 runtime_visible_annotations_length = attribute_length;
948 runtime_visible_annotations = cfs->get_u1_buffer();
949 assert(runtime_visible_annotations != NULL, "null visible annotations");
950 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
951 parse_annotations(runtime_visible_annotations,
952 runtime_visible_annotations_length,
953 parsed_annotations,
954 CHECK);
955 cfs->skip_u1_fast(runtime_visible_annotations_length);
956 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
957 runtime_invisible_annotations_length = attribute_length;
958 runtime_invisible_annotations = cfs->get_u1_buffer();
959 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
960 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
961 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
962 if (runtime_visible_type_annotations != NULL) {
963 classfile_parse_error(
964 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
965 }
966 runtime_visible_type_annotations_length = attribute_length;
967 runtime_visible_type_annotations = cfs->get_u1_buffer();
968 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
969 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
970 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
971 if (runtime_invisible_type_annotations_exists) {
972 classfile_parse_error(
973 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
974 } else {
975 runtime_invisible_type_annotations_exists = true;
976 }
977 if (PreserveAllAnnotations) {
978 runtime_invisible_type_annotations_length = attribute_length;
979 runtime_invisible_type_annotations = cfs->get_u1_buffer();
980 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
981 }
982 cfs->skip_u1(attribute_length, CHECK);
983 } else {
984 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
985 }
986 } else {
987 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
988 }
989 }
990
991 *constantvalue_index_addr = constantvalue_index;
992 *is_synthetic_addr = is_synthetic;
993 *generic_signature_index_addr = generic_signature_index;
994 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
995 runtime_visible_annotations_length,
996 runtime_invisible_annotations,
997 runtime_invisible_annotations_length,
998 CHECK);
999 parsed_annotations->set_field_annotations(a);
1000 a = assemble_annotations(runtime_visible_type_annotations,
1001 runtime_visible_type_annotations_length,
1002 runtime_invisible_type_annotations,
1003 runtime_invisible_type_annotations_length,
1004 CHECK);
1005 parsed_annotations->set_field_type_annotations(a);
1006 return;
1007 }
1008
1009
1010 // Field allocation types. Used for computing field offsets.
1011
1012 enum FieldAllocationType {
1013 STATIC_OOP, // Oops
1014 STATIC_BYTE, // Boolean, Byte, char
1015 STATIC_SHORT, // shorts
1016 STATIC_WORD, // ints
1017 STATIC_DOUBLE, // aligned long or double
1018 NONSTATIC_OOP,
1019 NONSTATIC_BYTE,
1020 NONSTATIC_SHORT,
1021 NONSTATIC_WORD,
1022 NONSTATIC_DOUBLE,
1023 MAX_FIELD_ALLOCATION_TYPE,
1024 BAD_ALLOCATION_TYPE = -1
1025 };
1026
1027 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1028 BAD_ALLOCATION_TYPE, // 0
1029 BAD_ALLOCATION_TYPE, // 1
1030 BAD_ALLOCATION_TYPE, // 2
1031 BAD_ALLOCATION_TYPE, // 3
1032 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1033 NONSTATIC_SHORT, // T_CHAR = 5,
1034 NONSTATIC_WORD, // T_FLOAT = 6,
1035 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1036 NONSTATIC_BYTE, // T_BYTE = 8,
1037 NONSTATIC_SHORT, // T_SHORT = 9,
1038 NONSTATIC_WORD, // T_INT = 10,
1039 NONSTATIC_DOUBLE, // T_LONG = 11,
1040 NONSTATIC_OOP, // T_OBJECT = 12,
1041 NONSTATIC_OOP, // T_ARRAY = 13,
1042 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1043 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1044 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1045 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1046 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1047 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1048 BAD_ALLOCATION_TYPE, // 0
1049 BAD_ALLOCATION_TYPE, // 1
1050 BAD_ALLOCATION_TYPE, // 2
1051 BAD_ALLOCATION_TYPE, // 3
1052 STATIC_BYTE , // T_BOOLEAN = 4,
1053 STATIC_SHORT, // T_CHAR = 5,
1054 STATIC_WORD, // T_FLOAT = 6,
1055 STATIC_DOUBLE, // T_DOUBLE = 7,
1056 STATIC_BYTE, // T_BYTE = 8,
1057 STATIC_SHORT, // T_SHORT = 9,
1058 STATIC_WORD, // T_INT = 10,
1059 STATIC_DOUBLE, // T_LONG = 11,
1060 STATIC_OOP, // T_OBJECT = 12,
1061 STATIC_OOP, // T_ARRAY = 13,
1062 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1063 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1064 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1065 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1066 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1067 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1068 };
1069
1070 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1071 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1072 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1073 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1074 return result;
1075 }
1076
1077 class FieldAllocationCount: public ResourceObj {
1078 public:
1079 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1080
1081 FieldAllocationCount() {
1082 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1083 count[i] = 0;
1084 }
1085 }
1086
1087 FieldAllocationType update(bool is_static, BasicType type) {
1088 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1089 // Make sure there is no overflow with injected fields.
1090 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1091 count[atype]++;
1092 return atype;
1093 }
1094 };
1095
1096 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1097 bool is_interface,
1098 FieldAllocationCount *fac,
1099 u2* java_fields_count_ptr, TRAPS) {
1100 ClassFileStream* cfs = stream();
1101 cfs->guarantee_more(2, CHECK_NULL); // length
1102 u2 length = cfs->get_u2_fast();
1103 *java_fields_count_ptr = length;
1104
1105 int num_injected = 0;
1106 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1107 int total_fields = length + num_injected;
1108
1109 // The field array starts with tuples of shorts
1110 // [access, name index, sig index, initial value index, byte offset].
1111 // A generic signature slot only exists for field with generic
1112 // signature attribute. And the access flag is set with
1113 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1114 // signature slots are at the end of the field array and after all
1115 // other fields data.
1116 //
1117 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1118 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1119 // ...
1120 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1121 // [generic signature index]
1122 // [generic signature index]
1123 // ...
1124 //
1125 // Allocate a temporary resource array for field data. For each field,
1126 // a slot is reserved in the temporary array for the generic signature
1127 // index. After parsing all fields, the data are copied to a permanent
1128 // array and any unused slots will be discarded.
1129 ResourceMark rm(THREAD);
1130 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1131 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1132
1133 // The generic signature slots start after all other fields' data.
1134 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1135 int num_generic_signature = 0;
1136 for (int n = 0; n < length; n++) {
1137 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1138
1139 AccessFlags access_flags;
1140 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1141 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1142 access_flags.set_flags(flags);
1143
1144 u2 name_index = cfs->get_u2_fast();
1145 int cp_size = _cp->length();
1146 check_property(valid_symbol_at(name_index),
1147 "Invalid constant pool index %u for field name in class file %s",
1148 name_index,
1149 CHECK_NULL);
1150 Symbol* name = _cp->symbol_at(name_index);
1151 verify_legal_field_name(name, CHECK_NULL);
1152
1153 u2 signature_index = cfs->get_u2_fast();
1154 check_property(valid_symbol_at(signature_index),
1155 "Invalid constant pool index %u for field signature in class file %s",
1156 signature_index, CHECK_NULL);
1157 Symbol* sig = _cp->symbol_at(signature_index);
1158 verify_legal_field_signature(name, sig, CHECK_NULL);
1159
1160 u2 constantvalue_index = 0;
1161 bool is_synthetic = false;
1162 u2 generic_signature_index = 0;
1163 bool is_static = access_flags.is_static();
1164 FieldAnnotationCollector parsed_annotations(_loader_data);
1165
1166 u2 attributes_count = cfs->get_u2_fast();
1167 if (attributes_count > 0) {
1168 parse_field_attributes(attributes_count, is_static, signature_index,
1169 &constantvalue_index, &is_synthetic,
1170 &generic_signature_index, &parsed_annotations,
1171 CHECK_NULL);
1172 if (parsed_annotations.field_annotations() != NULL) {
1173 if (_fields_annotations == NULL) {
1174 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1175 _loader_data, length, NULL,
1176 CHECK_NULL);
1177 }
1178 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1179 parsed_annotations.set_field_annotations(NULL);
1180 }
1181 if (parsed_annotations.field_type_annotations() != NULL) {
1182 if (_fields_type_annotations == NULL) {
1183 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1184 _loader_data, length, NULL,
1185 CHECK_NULL);
1186 }
1187 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1188 parsed_annotations.set_field_type_annotations(NULL);
1189 }
1190
1191 if (is_synthetic) {
1192 access_flags.set_is_synthetic();
1193 }
1194 if (generic_signature_index != 0) {
1195 access_flags.set_field_has_generic_signature();
1196 fa[generic_signature_slot] = generic_signature_index;
1197 generic_signature_slot ++;
1198 num_generic_signature ++;
1199 }
1200 }
1201
1202 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1203 field->initialize(access_flags.as_short(),
1204 name_index,
1205 signature_index,
1206 constantvalue_index);
1207 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1208
1209 // Remember how many oops we encountered and compute allocation type
1210 FieldAllocationType atype = fac->update(is_static, type);
1211 field->set_allocation_type(atype);
1212
1213 // After field is initialized with type, we can augment it with aux info
1214 if (parsed_annotations.has_any_annotations())
1215 parsed_annotations.apply_to(field);
1216 }
1217
1218 int index = length;
1219 if (num_injected != 0) {
1220 for (int n = 0; n < num_injected; n++) {
1221 // Check for duplicates
1222 if (injected[n].may_be_java) {
1223 Symbol* name = injected[n].name();
1224 Symbol* signature = injected[n].signature();
1225 bool duplicate = false;
1226 for (int i = 0; i < length; i++) {
1227 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1228 if (name == _cp->symbol_at(f->name_index()) &&
1229 signature == _cp->symbol_at(f->signature_index())) {
1230 // Symbol is desclared in Java so skip this one
1231 duplicate = true;
1232 break;
1233 }
1234 }
1235 if (duplicate) {
1236 // These will be removed from the field array at the end
1237 continue;
1238 }
1239 }
1240
1241 // Injected field
1242 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1243 field->initialize(JVM_ACC_FIELD_INTERNAL,
1244 injected[n].name_index,
1245 injected[n].signature_index,
1246 0);
1247
1248 BasicType type = FieldType::basic_type(injected[n].signature());
1249
1250 // Remember how many oops we encountered and compute allocation type
1251 FieldAllocationType atype = fac->update(false, type);
1252 field->set_allocation_type(atype);
1253 index++;
1254 }
1255 }
1256
1257 // Now copy the fields' data from the temporary resource array.
1258 // Sometimes injected fields already exist in the Java source so
1259 // the fields array could be too long. In that case the
1260 // fields array is trimed. Also unused slots that were reserved
1261 // for generic signature indexes are discarded.
1262 Array<u2>* fields = MetadataFactory::new_array<u2>(
1263 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1264 CHECK_NULL);
1265 _fields = fields; // save in case of error
1266 {
1267 int i = 0;
1268 for (; i < index * FieldInfo::field_slots; i++) {
1269 fields->at_put(i, fa[i]);
1270 }
1271 for (int j = total_fields * FieldInfo::field_slots;
1272 j < generic_signature_slot; j++) {
1273 fields->at_put(i++, fa[j]);
1274 }
1275 assert(i == fields->length(), "");
1276 }
1277
1278 if (_need_verify && length > 1) {
1279 // Check duplicated fields
1280 ResourceMark rm(THREAD);
1281 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1282 THREAD, NameSigHash*, HASH_ROW_SIZE);
1283 initialize_hashtable(names_and_sigs);
1284 bool dup = false;
1285 Symbol* name = NULL;
1286 Symbol* sig = NULL;
1287 {
1288 debug_only(No_Safepoint_Verifier nsv;)
1289 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1290 name = fs.name();
1291 sig = fs.signature();
1292 // If no duplicates, add name/signature in hashtable names_and_sigs.
1293 if (!put_after_lookup(name, sig, names_and_sigs)) {
1294 dup = true;
1295 break;
1296 }
1297 }
1298 }
1299 if (dup) {
1300 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1301 name->as_C_string(), sig->as_klass_external_name(), CHECK_NULL);
1302 }
1303 }
1304
1305 return fields;
1306 }
1307
1308
1309 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1310 while (length-- > 0) {
1311 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1312 }
1313 }
1314
1315
1316 u2* ClassFileParser::parse_exception_table(u4 code_length,
1317 u4 exception_table_length,
1318 TRAPS) {
1319 ClassFileStream* cfs = stream();
1320
1321 u2* exception_table_start = cfs->get_u2_buffer();
1322 assert(exception_table_start != NULL, "null exception table");
1323 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1324 // Will check legal target after parsing code array in verifier.
1325 if (_need_verify) {
1326 for (unsigned int i = 0; i < exception_table_length; i++) {
1327 u2 start_pc = cfs->get_u2_fast();
1328 u2 end_pc = cfs->get_u2_fast();
1329 u2 handler_pc = cfs->get_u2_fast();
1330 u2 catch_type_index = cfs->get_u2_fast();
1331 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1332 "Illegal exception table range in class file %s",
1333 CHECK_NULL);
1334 guarantee_property(handler_pc < code_length,
1335 "Illegal exception table handler in class file %s",
1336 CHECK_NULL);
1337 if (catch_type_index != 0) {
1338 guarantee_property(valid_klass_reference_at(catch_type_index),
1339 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1340 }
1341 }
1342 } else {
1343 cfs->skip_u2_fast(exception_table_length * 4);
1344 }
1345 return exception_table_start;
1346 }
1347
1348 void ClassFileParser::parse_linenumber_table(
1349 u4 code_attribute_length, u4 code_length,
1350 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1351 ClassFileStream* cfs = stream();
1352 unsigned int num_entries = cfs->get_u2(CHECK);
1353
1354 // Each entry is a u2 start_pc, and a u2 line_number
1355 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1356
1357 // Verify line number attribute and table length
1358 check_property(
1359 code_attribute_length == sizeof(u2) + length_in_bytes,
1360 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1361
1362 cfs->guarantee_more(length_in_bytes, CHECK);
1363
1364 if ((*write_stream) == NULL) {
1365 if (length_in_bytes > fixed_buffer_size) {
1366 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1367 } else {
1368 (*write_stream) = new CompressedLineNumberWriteStream(
1369 linenumbertable_buffer, fixed_buffer_size);
1370 }
1371 }
1372
1373 while (num_entries-- > 0) {
1374 u2 bci = cfs->get_u2_fast(); // start_pc
1375 u2 line = cfs->get_u2_fast(); // line_number
1376 guarantee_property(bci < code_length,
1377 "Invalid pc in LineNumberTable in class file %s", CHECK);
1378 (*write_stream)->write_pair(bci, line);
1379 }
1380 }
1381
1382
1383 // Class file LocalVariableTable elements.
1384 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1385 public:
1386 u2 start_bci;
1387 u2 length;
1388 u2 name_cp_index;
1389 u2 descriptor_cp_index;
1390 u2 slot;
1391 };
1392
1393
1394 class LVT_Hash: public CHeapObj<mtClass> {
1395 public:
1396 LocalVariableTableElement *_elem; // element
1397 LVT_Hash* _next; // Next entry in hash table
1398 };
1399
1400 unsigned int hash(LocalVariableTableElement *elem) {
1401 unsigned int raw_hash = elem->start_bci;
1402
1403 raw_hash = elem->length + raw_hash * 37;
1404 raw_hash = elem->name_cp_index + raw_hash * 37;
1405 raw_hash = elem->slot + raw_hash * 37;
1406
1407 return raw_hash % HASH_ROW_SIZE;
1408 }
1409
1410 void initialize_hashtable(LVT_Hash** table) {
1411 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1412 table[i] = NULL;
1413 }
1414 }
1415
1416 void clear_hashtable(LVT_Hash** table) {
1417 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1418 LVT_Hash* current = table[i];
1419 LVT_Hash* next;
1420 while (current != NULL) {
1421 next = current->_next;
1422 current->_next = NULL;
1423 delete(current);
1424 current = next;
1425 }
1426 table[i] = NULL;
1427 }
1428 }
1429
1430 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1431 LVT_Hash* entry = table[index];
1432
1433 /*
1434 * 3-tuple start_bci/length/slot has to be unique key,
1435 * so the following comparison seems to be redundant:
1436 * && elem->name_cp_index == entry->_elem->name_cp_index
1437 */
1438 while (entry != NULL) {
1439 if (elem->start_bci == entry->_elem->start_bci
1440 && elem->length == entry->_elem->length
1441 && elem->name_cp_index == entry->_elem->name_cp_index
1442 && elem->slot == entry->_elem->slot
1443 ) {
1444 return entry;
1445 }
1446 entry = entry->_next;
1447 }
1448 return NULL;
1449 }
1450
1451 // Return false if the local variable is found in table.
1452 // Return true if no duplicate is found.
1453 // And local variable is added as a new entry in table.
1454 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1455 // First lookup for duplicates
1456 int index = hash(elem);
1457 LVT_Hash* entry = LVT_lookup(elem, index, table);
1458
1459 if (entry != NULL) {
1460 return false;
1461 }
1462 // No duplicate is found, allocate a new entry and fill it.
1463 if ((entry = new LVT_Hash()) == NULL) {
1464 return false;
1465 }
1466 entry->_elem = elem;
1467
1468 // Insert into hash table
1469 entry->_next = table[index];
1470 table[index] = entry;
1471
1472 return true;
1473 }
1474
1475 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1476 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1477 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1478 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1479 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1480 lvt->signature_cp_index = 0;
1481 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1482 }
1483
1484 // Function is used to parse both attributes:
1485 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1486 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1487 u2 max_locals,
1488 u4 code_attribute_length,
1489 u2* localvariable_table_length,
1490 bool isLVTT,
1491 TRAPS) {
1492 ClassFileStream* cfs = stream();
1493 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1494 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1495 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1496 // Verify local variable table attribute has right length
1497 if (_need_verify) {
1498 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1499 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1500 }
1501 u2* localvariable_table_start = cfs->get_u2_buffer();
1502 assert(localvariable_table_start != NULL, "null local variable table");
1503 if (!_need_verify) {
1504 cfs->skip_u2_fast(size);
1505 } else {
1506 cfs->guarantee_more(size * 2, CHECK_NULL);
1507 for(int i = 0; i < (*localvariable_table_length); i++) {
1508 u2 start_pc = cfs->get_u2_fast();
1509 u2 length = cfs->get_u2_fast();
1510 u2 name_index = cfs->get_u2_fast();
1511 u2 descriptor_index = cfs->get_u2_fast();
1512 u2 index = cfs->get_u2_fast();
1513 // Assign to a u4 to avoid overflow
1514 u4 end_pc = (u4)start_pc + (u4)length;
1515
1516 if (start_pc >= code_length) {
1517 classfile_parse_error(
1518 "Invalid start_pc %u in %s in class file %s",
1519 start_pc, tbl_name, CHECK_NULL);
1520 }
1521 if (end_pc > code_length) {
1522 classfile_parse_error(
1523 "Invalid length %u in %s in class file %s",
1524 length, tbl_name, CHECK_NULL);
1525 }
1526 int cp_size = _cp->length();
1527 guarantee_property(valid_symbol_at(name_index),
1528 "Name index %u in %s has bad constant type in class file %s",
1529 name_index, tbl_name, CHECK_NULL);
1530 guarantee_property(valid_symbol_at(descriptor_index),
1531 "Signature index %u in %s has bad constant type in class file %s",
1532 descriptor_index, tbl_name, CHECK_NULL);
1533
1534 Symbol* name = _cp->symbol_at(name_index);
1535 Symbol* sig = _cp->symbol_at(descriptor_index);
1536 verify_legal_field_name(name, CHECK_NULL);
1537 u2 extra_slot = 0;
1538 if (!isLVTT) {
1539 verify_legal_field_signature(name, sig, CHECK_NULL);
1540
1541 // 4894874: check special cases for double and long local variables
1542 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1543 sig == vmSymbols::type_signature(T_LONG)) {
1544 extra_slot = 1;
1545 }
1546 }
1547 guarantee_property((index + extra_slot) < max_locals,
1548 "Invalid index %u in %s in class file %s",
1549 index, tbl_name, CHECK_NULL);
1550 }
1551 }
1552 return localvariable_table_start;
1553 }
1554
1555
1556 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1557 u1* u1_array, u2* u2_array, TRAPS) {
1558 ClassFileStream* cfs = stream();
1559 u2 index = 0; // index in the array with long/double occupying two slots
1560 u4 i1 = *u1_index;
1561 u4 i2 = *u2_index + 1;
1562 for(int i = 0; i < array_length; i++) {
1563 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1564 index++;
1565 if (tag == ITEM_Long || tag == ITEM_Double) {
1566 index++;
1567 } else if (tag == ITEM_Object) {
1568 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1569 guarantee_property(valid_klass_reference_at(class_index),
1570 "Bad class index %u in StackMap in class file %s",
1571 class_index, CHECK);
1572 } else if (tag == ITEM_Uninitialized) {
1573 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1574 guarantee_property(
1575 offset < code_length,
1576 "Bad uninitialized type offset %u in StackMap in class file %s",
1577 offset, CHECK);
1578 } else {
1579 guarantee_property(
1580 tag <= (u1)ITEM_Uninitialized,
1581 "Unknown variable type %u in StackMap in class file %s",
1582 tag, CHECK);
1583 }
1584 }
1585 u2_array[*u2_index] = index;
1586 *u1_index = i1;
1587 *u2_index = i2;
1588 }
1589
1590 u1* ClassFileParser::parse_stackmap_table(
1591 u4 code_attribute_length, TRAPS) {
1592 if (code_attribute_length == 0)
1593 return NULL;
1594
1595 ClassFileStream* cfs = stream();
1596 u1* stackmap_table_start = cfs->get_u1_buffer();
1597 assert(stackmap_table_start != NULL, "null stackmap table");
1598
1599 // check code_attribute_length first
1600 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1601
1602 if (!_need_verify && !DumpSharedSpaces) {
1603 return NULL;
1604 }
1605 return stackmap_table_start;
1606 }
1607
1608 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1609 u4 method_attribute_length,
1610 TRAPS) {
1611 ClassFileStream* cfs = stream();
1612 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1613 *checked_exceptions_length = cfs->get_u2_fast();
1614 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1615 u2* checked_exceptions_start = cfs->get_u2_buffer();
1616 assert(checked_exceptions_start != NULL, "null checked exceptions");
1617 if (!_need_verify) {
1618 cfs->skip_u2_fast(size);
1619 } else {
1620 // Verify each value in the checked exception table
1621 u2 checked_exception;
1622 u2 len = *checked_exceptions_length;
1623 cfs->guarantee_more(2 * len, CHECK_NULL);
1624 for (int i = 0; i < len; i++) {
1625 checked_exception = cfs->get_u2_fast();
1626 check_property(
1627 valid_klass_reference_at(checked_exception),
1628 "Exception name has bad type at constant pool %u in class file %s",
1629 checked_exception, CHECK_NULL);
1630 }
1631 }
1632 // check exceptions attribute length
1633 if (_need_verify) {
1634 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1635 sizeof(u2) * size),
1636 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1637 }
1638 return checked_exceptions_start;
1639 }
1640
1641 void ClassFileParser::throwIllegalSignature(
1642 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1643 ResourceMark rm(THREAD);
1644 Exceptions::fthrow(THREAD_AND_LOCATION,
1645 vmSymbols::java_lang_ClassFormatError(),
1646 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1647 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1648 }
1649
1650 // Skip an annotation. Return >=limit if there is any problem.
1651 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1652 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1653 // value := switch (tag:u1) { ... }
1654 index += 2; // skip atype
1655 if ((index += 2) >= limit) return limit; // read nmem
1656 int nmem = Bytes::get_Java_u2(buffer+index-2);
1657 while (--nmem >= 0 && index < limit) {
1658 index += 2; // skip member
1659 index = skip_annotation_value(buffer, limit, index);
1660 }
1661 return index;
1662 }
1663
1664 // Safely increment index by val if does not pass limit
1665 #define SAFE_ADD(index, limit, val) \
1666 if (index >= limit - val) return limit; \
1667 index += val;
1668
1669 // Skip an annotation value. Return >=limit if there is any problem.
1670 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1671 // value := switch (tag:u1) {
1672 // case B, C, I, S, Z, D, F, J, c: con:u2;
1673 // case e: e_class:u2 e_name:u2;
1674 // case s: s_con:u2;
1675 // case [: do(nval:u2) {value};
1676 // case @: annotation;
1677 // case s: s_con:u2;
1678 // }
1679 SAFE_ADD(index, limit, 1); // read tag
1680 u1 tag = buffer[index-1];
1681 switch (tag) {
1682 case 'B': case 'C': case 'I': case 'S': case 'Z':
1683 case 'D': case 'F': case 'J': case 'c': case 's':
1684 SAFE_ADD(index, limit, 2); // skip con or s_con
1685 break;
1686 case 'e':
1687 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1688 break;
1689 case '[':
1690 {
1691 SAFE_ADD(index, limit, 2); // read nval
1692 int nval = Bytes::get_Java_u2(buffer+index-2);
1693 while (--nval >= 0 && index < limit) {
1694 index = skip_annotation_value(buffer, limit, index);
1695 }
1696 }
1697 break;
1698 case '@':
1699 index = skip_annotation(buffer, limit, index);
1700 break;
1701 default:
1702 assert(false, "annotation tag");
1703 return limit; // bad tag byte
1704 }
1705 return index;
1706 }
1707
1708 // Sift through annotations, looking for those significant to the VM:
1709 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1710 ClassFileParser::AnnotationCollector* coll,
1711 TRAPS) {
1712 // annotations := do(nann:u2) {annotation}
1713 int index = 2;
1714 if (index >= limit) return; // read nann
1715 int nann = Bytes::get_Java_u2(buffer+index-2);
1716 enum { // initial annotation layout
1717 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1718 count_off = 2, // u2 such as 1 (one value)
1719 member_off = 4, // utf8 such as 'value'
1720 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1721 e_tag_val = 'e',
1722 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1723 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1724 e_size = 11, // end of 'e' annotation
1725 c_tag_val = 'c', // payload is type
1726 c_con_off = 7, // utf8 payload, such as 'I'
1727 c_size = 9, // end of 'c' annotation
1728 s_tag_val = 's', // payload is String
1729 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1730 s_size = 9,
1731 min_size = 6 // smallest possible size (zero members)
1732 };
1733 // Cannot add min_size to index in case of overflow MAX_INT
1734 while ((--nann) >= 0 && (index-2 <= limit - min_size)) {
1735 int index0 = index;
1736 index = skip_annotation(buffer, limit, index);
1737 u1* abase = buffer + index0;
1738 int atype = Bytes::get_Java_u2(abase + atype_off);
1739 int count = Bytes::get_Java_u2(abase + count_off);
1740 Symbol* aname = check_symbol_at(_cp, atype);
1741 if (aname == NULL) break; // invalid annotation name
1742 Symbol* member = NULL;
1743 if (count >= 1) {
1744 int member_index = Bytes::get_Java_u2(abase + member_off);
1745 member = check_symbol_at(_cp, member_index);
1746 if (member == NULL) break; // invalid member name
1747 }
1748
1749 // Here is where parsing particular annotations will take place.
1750 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1751 if (id == AnnotationCollector::_unknown) continue;
1752 coll->set_annotation(id);
1753
1754 if (id == AnnotationCollector::_sun_misc_Contended) {
1755 // @Contended can optionally specify the contention group.
1756 //
1757 // Contended group defines the equivalence class over the fields:
1758 // the fields within the same contended group are not treated distinct.
1759 // The only exception is default group, which does not incur the
1760 // equivalence. Naturally, contention group for classes is meaningless.
1761 //
1762 // While the contention group is specified as String, annotation
1763 // values are already interned, and we might as well use the constant
1764 // pool index as the group tag.
1765 //
1766 u2 group_index = 0; // default contended group
1767 if (count == 1
1768 && s_size == (index - index0) // match size
1769 && s_tag_val == *(abase + tag_off)
1770 && member == vmSymbols::value_name()) {
1771 group_index = Bytes::get_Java_u2(abase + s_con_off);
1772 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1773 group_index = 0; // default contended group
1774 }
1775 }
1776 coll->set_contended_group(group_index);
1777 }
1778 }
1779 }
1780
1781 ClassFileParser::AnnotationCollector::ID
1782 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1783 Symbol* name) {
1784 vmSymbols::SID sid = vmSymbols::find_sid(name);
1785 // Privileged code can use all annotations. Other code silently drops some.
1786 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1787 loader_data->is_ext_class_loader_data() ||
1788 loader_data->is_anonymous();
1789 switch (sid) {
1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1791 if (_location != _in_method) break; // only allow for methods
1792 if (!privileged) break; // only allow in privileged code
1793 return _method_CallerSensitive;
1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1795 if (_location != _in_method) break; // only allow for methods
1796 if (!privileged) break; // only allow in privileged code
1797 return _method_ForceInline;
1798 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1799 if (_location != _in_method) break; // only allow for methods
1800 if (!privileged) break; // only allow in privileged code
1801 return _method_DontInline;
1802 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1803 if (_location != _in_method) break; // only allow for methods
1804 if (!privileged) break; // only allow in privileged code
1805 return _method_InjectedProfile;
1806 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1807 if (_location != _in_method) break; // only allow for methods
1808 if (!privileged) break; // only allow in privileged code
1809 return _method_LambdaForm_Compiled;
1810 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1811 if (_location != _in_method) break; // only allow for methods
1812 if (!privileged) break; // only allow in privileged code
1813 return _method_LambdaForm_Hidden;
1814 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1815 if (_location != _in_field) break; // only allow for fields
1816 if (!privileged) break; // only allow in privileged code
1817 return _field_Stable;
1818 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1819 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1820 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1821 return _sun_misc_Contended;
1822 default: break;
1823 }
1824 return AnnotationCollector::_unknown;
1825 }
1826
1827 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1828 if (is_contended())
1829 f->set_contended_group(contended_group());
1830 if (is_stable())
1831 f->set_stable(true);
1832 }
1833
1834 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1835 // If there's an error deallocate metadata for field annotations
1836 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1837 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1838 }
1839
1840 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1841 if (has_annotation(_method_CallerSensitive))
1842 m->set_caller_sensitive(true);
1843 if (has_annotation(_method_ForceInline))
1844 m->set_force_inline(true);
1845 if (has_annotation(_method_DontInline))
1846 m->set_dont_inline(true);
1847 if (has_annotation(_method_InjectedProfile))
1848 m->set_has_injected_profile(true);
1849 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1850 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1851 if (has_annotation(_method_LambdaForm_Hidden))
1852 m->set_hidden(true);
1853 }
1854
1855 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1856 k->set_is_contended(is_contended());
1857 }
1858
1859
1860 #define MAX_ARGS_SIZE 255
1861 #define MAX_CODE_SIZE 65535
1862 #define INITIAL_MAX_LVT_NUMBER 256
1863
1864 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1865 *
1866 * Rules for LVT's and LVTT's are:
1867 * - There can be any number of LVT's and LVTT's.
1868 * - If there are n LVT's, it is the same as if there was just
1869 * one LVT containing all the entries from the n LVT's.
1870 * - There may be no more than one LVT entry per local variable.
1871 * Two LVT entries are 'equal' if these fields are the same:
1872 * start_pc, length, name, slot
1873 * - There may be no more than one LVTT entry per each LVT entry.
1874 * Each LVTT entry has to match some LVT entry.
1875 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1876 */
1877 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1878 int lvt_cnt,
1879 u2* localvariable_table_length,
1880 u2** localvariable_table_start,
1881 int lvtt_cnt,
1882 u2* localvariable_type_table_length,
1883 u2** localvariable_type_table_start,
1884 TRAPS) {
1885
1886 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1887 initialize_hashtable(lvt_Hash);
1888
1889 // To fill LocalVariableTable in
1890 Classfile_LVT_Element* cf_lvt;
1891 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1892
1893 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1894 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1895 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1896 copy_lvt_element(&cf_lvt[idx], lvt);
1897 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1898 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1899 && _need_verify
1900 && _major_version >= JAVA_1_5_VERSION) {
1901 clear_hashtable(lvt_Hash);
1902 classfile_parse_error("Duplicated LocalVariableTable attribute "
1903 "entry for '%s' in class file %s",
1904 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1905 CHECK);
1906 }
1907 }
1908 }
1909
1910 // To merge LocalVariableTable and LocalVariableTypeTable
1911 Classfile_LVT_Element* cf_lvtt;
1912 LocalVariableTableElement lvtt_elem;
1913
1914 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1915 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1916 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1917 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1918 int index = hash(&lvtt_elem);
1919 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1920 if (entry == NULL) {
1921 if (_need_verify) {
1922 clear_hashtable(lvt_Hash);
1923 classfile_parse_error("LVTT entry for '%s' in class file %s "
1924 "does not match any LVT entry",
1925 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1926 CHECK);
1927 }
1928 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1929 clear_hashtable(lvt_Hash);
1930 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1931 "entry for '%s' in class file %s",
1932 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1933 CHECK);
1934 } else {
1935 // to add generic signatures into LocalVariableTable
1936 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1937 }
1938 }
1939 }
1940 clear_hashtable(lvt_Hash);
1941 }
1942
1943
1944 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1945 u1* runtime_visible_annotations,
1946 int runtime_visible_annotations_length,
1947 u1* runtime_invisible_annotations,
1948 int runtime_invisible_annotations_length,
1949 u1* runtime_visible_parameter_annotations,
1950 int runtime_visible_parameter_annotations_length,
1951 u1* runtime_invisible_parameter_annotations,
1952 int runtime_invisible_parameter_annotations_length,
1953 u1* runtime_visible_type_annotations,
1954 int runtime_visible_type_annotations_length,
1955 u1* runtime_invisible_type_annotations,
1956 int runtime_invisible_type_annotations_length,
1957 u1* annotation_default,
1958 int annotation_default_length,
1959 TRAPS) {
1960
1961 AnnotationArray* a;
1962
1963 if (runtime_visible_annotations_length +
1964 runtime_invisible_annotations_length > 0) {
1965 a = assemble_annotations(runtime_visible_annotations,
1966 runtime_visible_annotations_length,
1967 runtime_invisible_annotations,
1968 runtime_invisible_annotations_length,
1969 CHECK);
1970 cm->set_method_annotations(a);
1971 }
1972
1973 if (runtime_visible_parameter_annotations_length +
1974 runtime_invisible_parameter_annotations_length > 0) {
1975 a = assemble_annotations(runtime_visible_parameter_annotations,
1976 runtime_visible_parameter_annotations_length,
1977 runtime_invisible_parameter_annotations,
1978 runtime_invisible_parameter_annotations_length,
1979 CHECK);
1980 cm->set_parameter_annotations(a);
1981 }
1982
1983 if (annotation_default_length > 0) {
1984 a = assemble_annotations(annotation_default,
1985 annotation_default_length,
1986 NULL,
1987 0,
1988 CHECK);
1989 cm->set_default_annotations(a);
1990 }
1991
1992 if (runtime_visible_type_annotations_length +
1993 runtime_invisible_type_annotations_length > 0) {
1994 a = assemble_annotations(runtime_visible_type_annotations,
1995 runtime_visible_type_annotations_length,
1996 runtime_invisible_type_annotations,
1997 runtime_invisible_type_annotations_length,
1998 CHECK);
1999 cm->set_type_annotations(a);
2000 }
2001 }
2002
2003
2004 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2005 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2006 // Method* to save footprint, so we only know the size of the resulting Method* when the
2007 // entire method attribute is parsed.
2008 //
2009 // The promoted_flags parameter is used to pass relevant access_flags
2010 // from the method back up to the containing klass. These flag values
2011 // are added to klass's access_flags.
2012
2013 methodHandle ClassFileParser::parse_method(bool is_interface,
2014 AccessFlags *promoted_flags,
2015 TRAPS) {
2016 ClassFileStream* cfs = stream();
2017 methodHandle nullHandle;
2018 ResourceMark rm(THREAD);
2019 // Parse fixed parts
2020 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
2021
2022 int flags = cfs->get_u2_fast();
2023 u2 name_index = cfs->get_u2_fast();
2024 int cp_size = _cp->length();
2025 check_property(
2026 valid_symbol_at(name_index),
2027 "Illegal constant pool index %u for method name in class file %s",
2028 name_index, CHECK_(nullHandle));
2029 Symbol* name = _cp->symbol_at(name_index);
2030 verify_legal_method_name(name, CHECK_(nullHandle));
2031
2032 u2 signature_index = cfs->get_u2_fast();
2033 guarantee_property(
2034 valid_symbol_at(signature_index),
2035 "Illegal constant pool index %u for method signature in class file %s",
2036 signature_index, CHECK_(nullHandle));
2037 Symbol* signature = _cp->symbol_at(signature_index);
2038
2039 AccessFlags access_flags;
2040 if (name == vmSymbols::class_initializer_name()) {
2041 // We ignore the other access flags for a valid class initializer.
2042 // (JVM Spec 2nd ed., chapter 4.6)
2043 if (_major_version < 51) { // backward compatibility
2044 flags = JVM_ACC_STATIC;
2045 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2046 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2047 }
2048 } else {
2049 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2050 }
2051
2052 int args_size = -1; // only used when _need_verify is true
2053 if (_need_verify) {
2054 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2055 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2056 if (args_size > MAX_ARGS_SIZE) {
2057 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2058 }
2059 }
2060
2061 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2062
2063 // Default values for code and exceptions attribute elements
2064 u2 max_stack = 0;
2065 u2 max_locals = 0;
2066 u4 code_length = 0;
2067 u1* code_start = 0;
2068 u2 exception_table_length = 0;
2069 u2* exception_table_start = NULL;
2070 Array<int>* exception_handlers = Universe::the_empty_int_array();
2071 u2 checked_exceptions_length = 0;
2072 u2* checked_exceptions_start = NULL;
2073 CompressedLineNumberWriteStream* linenumber_table = NULL;
2074 int linenumber_table_length = 0;
2075 int total_lvt_length = 0;
2076 u2 lvt_cnt = 0;
2077 u2 lvtt_cnt = 0;
2078 bool lvt_allocated = false;
2079 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2080 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2081 u2* localvariable_table_length;
2082 u2** localvariable_table_start;
2083 u2* localvariable_type_table_length;
2084 u2** localvariable_type_table_start;
2085 u2 method_parameters_length = 0;
2086 u1* method_parameters_data = NULL;
2087 bool method_parameters_seen = false;
2088 bool parsed_code_attribute = false;
2089 bool parsed_checked_exceptions_attribute = false;
2090 bool parsed_stackmap_attribute = false;
2091 // stackmap attribute - JDK1.5
2092 u1* stackmap_data = NULL;
2093 int stackmap_data_length = 0;
2094 u2 generic_signature_index = 0;
2095 MethodAnnotationCollector parsed_annotations;
2096 u1* runtime_visible_annotations = NULL;
2097 int runtime_visible_annotations_length = 0;
2098 u1* runtime_invisible_annotations = NULL;
2099 int runtime_invisible_annotations_length = 0;
2100 u1* runtime_visible_parameter_annotations = NULL;
2101 int runtime_visible_parameter_annotations_length = 0;
2102 u1* runtime_invisible_parameter_annotations = NULL;
2103 int runtime_invisible_parameter_annotations_length = 0;
2104 u1* runtime_visible_type_annotations = NULL;
2105 int runtime_visible_type_annotations_length = 0;
2106 u1* runtime_invisible_type_annotations = NULL;
2107 int runtime_invisible_type_annotations_length = 0;
2108 bool runtime_invisible_type_annotations_exists = false;
2109 u1* annotation_default = NULL;
2110 int annotation_default_length = 0;
2111
2112 // Parse code and exceptions attribute
2113 u2 method_attributes_count = cfs->get_u2_fast();
2114 while (method_attributes_count--) {
2115 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2116 u2 method_attribute_name_index = cfs->get_u2_fast();
2117 u4 method_attribute_length = cfs->get_u4_fast();
2118 check_property(
2119 valid_symbol_at(method_attribute_name_index),
2120 "Invalid method attribute name index %u in class file %s",
2121 method_attribute_name_index, CHECK_(nullHandle));
2122
2123 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2124 if (method_attribute_name == vmSymbols::tag_code()) {
2125 // Parse Code attribute
2126 if (_need_verify) {
2127 guarantee_property(
2128 !access_flags.is_native() && !access_flags.is_abstract(),
2129 "Code attribute in native or abstract methods in class file %s",
2130 CHECK_(nullHandle));
2131 }
2132 if (parsed_code_attribute) {
2133 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2134 }
2135 parsed_code_attribute = true;
2136
2137 // Stack size, locals size, and code size
2138 if (_major_version == 45 && _minor_version <= 2) {
2139 cfs->guarantee_more(4, CHECK_(nullHandle));
2140 max_stack = cfs->get_u1_fast();
2141 max_locals = cfs->get_u1_fast();
2142 code_length = cfs->get_u2_fast();
2143 } else {
2144 cfs->guarantee_more(8, CHECK_(nullHandle));
2145 max_stack = cfs->get_u2_fast();
2146 max_locals = cfs->get_u2_fast();
2147 code_length = cfs->get_u4_fast();
2148 }
2149 if (_need_verify) {
2150 guarantee_property(args_size <= max_locals,
2151 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2152 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2153 "Invalid method Code length %u in class file %s",
2154 code_length, CHECK_(nullHandle));
2155 }
2156 // Code pointer
2157 code_start = cfs->get_u1_buffer();
2158 assert(code_start != NULL, "null code start");
2159 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2160 cfs->skip_u1_fast(code_length);
2161
2162 // Exception handler table
2163 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2164 exception_table_length = cfs->get_u2_fast();
2165 if (exception_table_length > 0) {
2166 exception_table_start =
2167 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2168 }
2169
2170 // Parse additional attributes in code attribute
2171 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2172 u2 code_attributes_count = cfs->get_u2_fast();
2173
2174 unsigned int calculated_attribute_length = 0;
2175
2176 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2177 calculated_attribute_length =
2178 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2179 } else {
2180 // max_stack, locals and length are smaller in pre-version 45.2 classes
2181 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2182 }
2183 calculated_attribute_length +=
2184 code_length +
2185 sizeof(exception_table_length) +
2186 sizeof(code_attributes_count) +
2187 exception_table_length *
2188 ( sizeof(u2) + // start_pc
2189 sizeof(u2) + // end_pc
2190 sizeof(u2) + // handler_pc
2191 sizeof(u2) ); // catch_type_index
2192
2193 while (code_attributes_count--) {
2194 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2195 u2 code_attribute_name_index = cfs->get_u2_fast();
2196 u4 code_attribute_length = cfs->get_u4_fast();
2197 calculated_attribute_length += code_attribute_length +
2198 sizeof(code_attribute_name_index) +
2199 sizeof(code_attribute_length);
2200 check_property(valid_symbol_at(code_attribute_name_index),
2201 "Invalid code attribute name index %u in class file %s",
2202 code_attribute_name_index,
2203 CHECK_(nullHandle));
2204 if (LoadLineNumberTables &&
2205 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2206 // Parse and compress line number table
2207 parse_linenumber_table(code_attribute_length, code_length,
2208 &linenumber_table, CHECK_(nullHandle));
2209
2210 } else if (LoadLocalVariableTables &&
2211 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2212 // Parse local variable table
2213 if (!lvt_allocated) {
2214 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2215 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2216 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2217 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2218 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2219 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2220 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2221 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2222 lvt_allocated = true;
2223 }
2224 if (lvt_cnt == max_lvt_cnt) {
2225 max_lvt_cnt <<= 1;
2226 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2227 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2228 }
2229 localvariable_table_start[lvt_cnt] =
2230 parse_localvariable_table(code_length,
2231 max_locals,
2232 code_attribute_length,
2233 &localvariable_table_length[lvt_cnt],
2234 false, // is not LVTT
2235 CHECK_(nullHandle));
2236 total_lvt_length += localvariable_table_length[lvt_cnt];
2237 lvt_cnt++;
2238 } else if (LoadLocalVariableTypeTables &&
2239 _major_version >= JAVA_1_5_VERSION &&
2240 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2241 if (!lvt_allocated) {
2242 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2243 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2244 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2245 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2246 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2247 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2248 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2249 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2250 lvt_allocated = true;
2251 }
2252 // Parse local variable type table
2253 if (lvtt_cnt == max_lvtt_cnt) {
2254 max_lvtt_cnt <<= 1;
2255 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2256 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2257 }
2258 localvariable_type_table_start[lvtt_cnt] =
2259 parse_localvariable_table(code_length,
2260 max_locals,
2261 code_attribute_length,
2262 &localvariable_type_table_length[lvtt_cnt],
2263 true, // is LVTT
2264 CHECK_(nullHandle));
2265 lvtt_cnt++;
2266 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2267 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2268 // Stack map is only needed by the new verifier in JDK1.5.
2269 if (parsed_stackmap_attribute) {
2270 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2271 }
2272 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2273 stackmap_data_length = code_attribute_length;
2274 parsed_stackmap_attribute = true;
2275 } else {
2276 // Skip unknown attributes
2277 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2278 }
2279 }
2280 // check method attribute length
2281 if (_need_verify) {
2282 guarantee_property(method_attribute_length == calculated_attribute_length,
2283 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2284 }
2285 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2286 // Parse Exceptions attribute
2287 if (parsed_checked_exceptions_attribute) {
2288 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2289 }
2290 parsed_checked_exceptions_attribute = true;
2291 checked_exceptions_start =
2292 parse_checked_exceptions(&checked_exceptions_length,
2293 method_attribute_length,
2294 CHECK_(nullHandle));
2295 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2296 // reject multiple method parameters
2297 if (method_parameters_seen) {
2298 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2299 }
2300 method_parameters_seen = true;
2301 method_parameters_length = cfs->get_u1_fast();
2302 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2303 classfile_parse_error(
2304 "Invalid MethodParameters method attribute length %u in class file",
2305 method_attribute_length, CHECK_(nullHandle));
2306 }
2307 method_parameters_data = cfs->get_u1_buffer();
2308 cfs->skip_u2_fast(method_parameters_length);
2309 cfs->skip_u2_fast(method_parameters_length);
2310 // ignore this attribute if it cannot be reflected
2311 if (!SystemDictionary::Parameter_klass_loaded())
2312 method_parameters_length = 0;
2313 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2314 if (method_attribute_length != 0) {
2315 classfile_parse_error(
2316 "Invalid Synthetic method attribute length %u in class file %s",
2317 method_attribute_length, CHECK_(nullHandle));
2318 }
2319 // Should we check that there hasn't already been a synthetic attribute?
2320 access_flags.set_is_synthetic();
2321 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2322 if (method_attribute_length != 0) {
2323 classfile_parse_error(
2324 "Invalid Deprecated method attribute length %u in class file %s",
2325 method_attribute_length, CHECK_(nullHandle));
2326 }
2327 } else if (_major_version >= JAVA_1_5_VERSION) {
2328 if (method_attribute_name == vmSymbols::tag_signature()) {
2329 if (method_attribute_length != 2) {
2330 classfile_parse_error(
2331 "Invalid Signature attribute length %u in class file %s",
2332 method_attribute_length, CHECK_(nullHandle));
2333 }
2334 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2335 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2336 runtime_visible_annotations_length = method_attribute_length;
2337 runtime_visible_annotations = cfs->get_u1_buffer();
2338 assert(runtime_visible_annotations != NULL, "null visible annotations");
2339 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_(nullHandle));
2340 parse_annotations(runtime_visible_annotations,
2341 runtime_visible_annotations_length, &parsed_annotations,
2342 CHECK_(nullHandle));
2343 cfs->skip_u1_fast(runtime_visible_annotations_length);
2344 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2345 runtime_invisible_annotations_length = method_attribute_length;
2346 runtime_invisible_annotations = cfs->get_u1_buffer();
2347 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2348 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2349 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2350 runtime_visible_parameter_annotations_length = method_attribute_length;
2351 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2352 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2353 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2354 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
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 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2359 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2360 annotation_default_length = method_attribute_length;
2361 annotation_default = cfs->get_u1_buffer();
2362 assert(annotation_default != NULL, "null annotation default");
2363 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2364 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2365 if (runtime_visible_type_annotations != NULL) {
2366 classfile_parse_error(
2367 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2368 CHECK_(nullHandle));
2369 }
2370 runtime_visible_type_annotations_length = method_attribute_length;
2371 runtime_visible_type_annotations = cfs->get_u1_buffer();
2372 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2373 // No need for the VM to parse Type annotations
2374 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2375 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2376 if (runtime_invisible_type_annotations_exists) {
2377 classfile_parse_error(
2378 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2379 CHECK_(nullHandle));
2380 } else {
2381 runtime_invisible_type_annotations_exists = true;
2382 }
2383 if (PreserveAllAnnotations) {
2384 runtime_invisible_type_annotations_length = method_attribute_length;
2385 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2386 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2387 }
2388 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2389 } else {
2390 // Skip unknown attributes
2391 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2392 }
2393 } else {
2394 // Skip unknown attributes
2395 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2396 }
2397 }
2398
2399 if (linenumber_table != NULL) {
2400 linenumber_table->write_terminator();
2401 linenumber_table_length = linenumber_table->position();
2402 }
2403
2404 // Make sure there's at least one Code attribute in non-native/non-abstract method
2405 if (_need_verify) {
2406 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2407 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2408 }
2409
2410 // All sizing information for a Method* is finally available, now create it
2411 InlineTableSizes sizes(
2412 total_lvt_length,
2413 linenumber_table_length,
2414 exception_table_length,
2415 checked_exceptions_length,
2416 method_parameters_length,
2417 generic_signature_index,
2418 runtime_visible_annotations_length +
2419 runtime_invisible_annotations_length,
2420 runtime_visible_parameter_annotations_length +
2421 runtime_invisible_parameter_annotations_length,
2422 runtime_visible_type_annotations_length +
2423 runtime_invisible_type_annotations_length,
2424 annotation_default_length,
2425 0);
2426
2427 Method* m = Method::allocate(
2428 _loader_data, code_length, access_flags, &sizes,
2429 ConstMethod::NORMAL, CHECK_(nullHandle));
2430
2431 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2432
2433 // Fill in information from fixed part (access_flags already set)
2434 m->set_constants(_cp);
2435 m->set_name_index(name_index);
2436 m->set_signature_index(signature_index);
2437
2438 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2439 m->constMethod()->set_result_type(rtf.type());
2440
2441 if (args_size >= 0) {
2442 m->set_size_of_parameters(args_size);
2443 } else {
2444 m->compute_size_of_parameters(THREAD);
2445 }
2446 #ifdef ASSERT
2447 if (args_size >= 0) {
2448 m->compute_size_of_parameters(THREAD);
2449 assert(args_size == m->size_of_parameters(), "");
2450 }
2451 #endif
2452
2453 // Fill in code attribute information
2454 m->set_max_stack(max_stack);
2455 m->set_max_locals(max_locals);
2456 if (stackmap_data != NULL) {
2457 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2458 stackmap_data_length, CHECK_NULL);
2459 }
2460
2461 // Copy byte codes
2462 m->set_code(code_start);
2463
2464 // Copy line number table
2465 if (linenumber_table != NULL) {
2466 memcpy(m->compressed_linenumber_table(),
2467 linenumber_table->buffer(), linenumber_table_length);
2468 }
2469
2470 // Copy exception table
2471 if (exception_table_length > 0) {
2472 int size =
2473 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2474 copy_u2_with_conversion((u2*) m->exception_table_start(),
2475 exception_table_start, size);
2476 }
2477
2478 // Copy method parameters
2479 if (method_parameters_length > 0) {
2480 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2481 for (int i = 0; i < method_parameters_length; i++) {
2482 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2483 method_parameters_data += 2;
2484 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2485 method_parameters_data += 2;
2486 }
2487 }
2488
2489 // Copy checked exceptions
2490 if (checked_exceptions_length > 0) {
2491 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2492 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2493 }
2494
2495 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2496 if (total_lvt_length > 0) {
2497 promoted_flags->set_has_localvariable_table();
2498 copy_localvariable_table(m->constMethod(), lvt_cnt,
2499 localvariable_table_length,
2500 localvariable_table_start,
2501 lvtt_cnt,
2502 localvariable_type_table_length,
2503 localvariable_type_table_start, CHECK_NULL);
2504 }
2505
2506 if (parsed_annotations.has_any_annotations())
2507 parsed_annotations.apply_to(m);
2508
2509 // Copy annotations
2510 copy_method_annotations(m->constMethod(),
2511 runtime_visible_annotations,
2512 runtime_visible_annotations_length,
2513 runtime_invisible_annotations,
2514 runtime_invisible_annotations_length,
2515 runtime_visible_parameter_annotations,
2516 runtime_visible_parameter_annotations_length,
2517 runtime_invisible_parameter_annotations,
2518 runtime_invisible_parameter_annotations_length,
2519 runtime_visible_type_annotations,
2520 runtime_visible_type_annotations_length,
2521 runtime_invisible_type_annotations,
2522 runtime_invisible_type_annotations_length,
2523 annotation_default,
2524 annotation_default_length,
2525 CHECK_NULL);
2526
2527 if (name == vmSymbols::finalize_method_name() &&
2528 signature == vmSymbols::void_method_signature()) {
2529 if (m->is_empty_method()) {
2530 _has_empty_finalizer = true;
2531 } else {
2532 _has_finalizer = true;
2533 }
2534 }
2535 if (name == vmSymbols::object_initializer_name() &&
2536 signature == vmSymbols::void_method_signature() &&
2537 m->is_vanilla_constructor()) {
2538 _has_vanilla_constructor = true;
2539 }
2540
2541 NOT_PRODUCT(m->verify());
2542 return m;
2543 }
2544
2545
2546 // The promoted_flags parameter is used to pass relevant access_flags
2547 // from the methods back up to the containing klass. These flag values
2548 // are added to klass's access_flags.
2549
2550 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2551 AccessFlags* promoted_flags,
2552 bool* has_final_method,
2553 bool* declares_default_methods,
2554 TRAPS) {
2555 ClassFileStream* cfs = stream();
2556 cfs->guarantee_more(2, CHECK_NULL); // length
2557 u2 length = cfs->get_u2_fast();
2558 if (length == 0) {
2559 _methods = Universe::the_empty_method_array();
2560 } else {
2561 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2562
2563 HandleMark hm(THREAD);
2564 for (int index = 0; index < length; index++) {
2565 methodHandle method = parse_method(is_interface,
2566 promoted_flags,
2567 CHECK_NULL);
2568
2569 if (method->is_final()) {
2570 *has_final_method = true;
2571 }
2572 // declares_default_methods: declares concrete instance methods, any access flags
2573 // used for interface initialization, and default method inheritance analysis
2574 if (is_interface && !(*declares_default_methods)
2575 && !method->is_abstract() && !method->is_static()) {
2576 *declares_default_methods = true;
2577 }
2578 _methods->at_put(index, method());
2579 }
2580
2581 if (_need_verify && length > 1) {
2582 // Check duplicated methods
2583 ResourceMark rm(THREAD);
2584 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2585 THREAD, NameSigHash*, HASH_ROW_SIZE);
2586 initialize_hashtable(names_and_sigs);
2587 bool dup = false;
2588 Symbol* name = NULL;
2589 Symbol* sig = NULL;
2590 {
2591 debug_only(No_Safepoint_Verifier nsv;)
2592 for (int i = 0; i < length; i++) {
2593 Method* m = _methods->at(i);
2594 name = m->name();
2595 sig = m->signature();
2596 // If no duplicates, add name/signature in hashtable names_and_sigs.
2597 if (!put_after_lookup(name, sig, names_and_sigs)) {
2598 dup = true;
2599 break;
2600 }
2601 }
2602 }
2603 if (dup) {
2604 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2605 name->as_C_string(), sig->as_klass_external_name(), CHECK_NULL);
2606 }
2607 }
2608 }
2609 return _methods;
2610 }
2611
2612
2613 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2614 int length = methods->length();
2615 // If JVMTI original method ordering or sharing is enabled we have to
2616 // remember the original class file ordering.
2617 // We temporarily use the vtable_index field in the Method* to store the
2618 // class file index, so we can read in after calling qsort.
2619 // Put the method ordering in the shared archive.
2620 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2621 for (int index = 0; index < length; index++) {
2622 Method* m = methods->at(index);
2623 assert(!m->valid_vtable_index(), "vtable index should not be set");
2624 m->set_vtable_index(index);
2625 }
2626 }
2627 // Sort method array by ascending method name (for faster lookups & vtable construction)
2628 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2629 Method::sort_methods(methods);
2630
2631 intArray* method_ordering = NULL;
2632 // If JVMTI original method ordering or sharing is enabled construct int
2633 // array remembering the original ordering
2634 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2635 method_ordering = new intArray(length);
2636 for (int index = 0; index < length; index++) {
2637 Method* m = methods->at(index);
2638 int old_index = m->vtable_index();
2639 assert(old_index >= 0 && old_index < length, "invalid method index");
2640 method_ordering->at_put(index, old_index);
2641 m->set_vtable_index(Method::invalid_vtable_index);
2642 }
2643 }
2644 return method_ordering;
2645 }
2646
2647 // Parse generic_signature attribute for methods and fields
2648 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2649 ClassFileStream* cfs = stream();
2650 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2651 u2 generic_signature_index = cfs->get_u2_fast();
2652 check_property(
2653 valid_symbol_at(generic_signature_index),
2654 "Invalid Signature attribute at constant pool index %u in class file %s",
2655 generic_signature_index, CHECK_0);
2656 return generic_signature_index;
2657 }
2658
2659 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2660 ClassFileStream* cfs = stream();
2661 cfs->guarantee_more(2, CHECK); // sourcefile_index
2662 u2 sourcefile_index = cfs->get_u2_fast();
2663 check_property(
2664 valid_symbol_at(sourcefile_index),
2665 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2666 sourcefile_index, CHECK);
2667 set_class_sourcefile_index(sourcefile_index);
2668 }
2669
2670
2671
2672 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2673 ClassFileStream* cfs = stream();
2674 u1* sde_buffer = cfs->get_u1_buffer();
2675 assert(sde_buffer != NULL, "null sde buffer");
2676
2677 // Don't bother storing it if there is no way to retrieve it
2678 if (JvmtiExport::can_get_source_debug_extension()) {
2679 assert((length+1) > length, "Overflow checking");
2680 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2681 for (int i = 0; i < length; i++) {
2682 sde[i] = sde_buffer[i];
2683 }
2684 sde[length] = '\0';
2685 set_class_sde_buffer((char*)sde, length);
2686 }
2687 // Got utf8 string, set stream position forward
2688 cfs->skip_u1(length, CHECK);
2689 }
2690
2691
2692 // Inner classes can be static, private or protected (classic VM does this)
2693 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2694
2695 // Return number of classes in the inner classes attribute table
2696 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2697 bool parsed_enclosingmethod_attribute,
2698 u2 enclosing_method_class_index,
2699 u2 enclosing_method_method_index,
2700 TRAPS) {
2701 ClassFileStream* cfs = stream();
2702 u1* current_mark = cfs->current();
2703 u2 length = 0;
2704 if (inner_classes_attribute_start != NULL) {
2705 cfs->set_current(inner_classes_attribute_start);
2706 cfs->guarantee_more(2, CHECK_0); // length
2707 length = cfs->get_u2_fast();
2708 }
2709
2710 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2711 // method data:
2712 // [inner_class_info_index,
2713 // outer_class_info_index,
2714 // inner_name_index,
2715 // inner_class_access_flags,
2716 // ...
2717 // enclosing_method_class_index,
2718 // enclosing_method_method_index]
2719 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2720 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2721 _inner_classes = inner_classes;
2722
2723 int index = 0;
2724 int cp_size = _cp->length();
2725 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2726 for (int n = 0; n < length; n++) {
2727 // Inner class index
2728 u2 inner_class_info_index = cfs->get_u2_fast();
2729 check_property(
2730 inner_class_info_index == 0 ||
2731 valid_klass_reference_at(inner_class_info_index),
2732 "inner_class_info_index %u has bad constant type in class file %s",
2733 inner_class_info_index, CHECK_0);
2734 // Outer class index
2735 u2 outer_class_info_index = cfs->get_u2_fast();
2736 check_property(
2737 outer_class_info_index == 0 ||
2738 valid_klass_reference_at(outer_class_info_index),
2739 "outer_class_info_index %u has bad constant type in class file %s",
2740 outer_class_info_index, CHECK_0);
2741 // Inner class name
2742 u2 inner_name_index = cfs->get_u2_fast();
2743 check_property(
2744 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2745 "inner_name_index %u has bad constant type in class file %s",
2746 inner_name_index, CHECK_0);
2747 if (_need_verify) {
2748 guarantee_property(inner_class_info_index != outer_class_info_index,
2749 "Class is both outer and inner class in class file %s", CHECK_0);
2750 }
2751 // Access flags
2752 AccessFlags inner_access_flags;
2753 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2754 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2755 // Set abstract bit for old class files for backward compatibility
2756 flags |= JVM_ACC_ABSTRACT;
2757 }
2758 verify_legal_class_modifiers(flags, CHECK_0);
2759 inner_access_flags.set_flags(flags);
2760
2761 inner_classes->at_put(index++, inner_class_info_index);
2762 inner_classes->at_put(index++, outer_class_info_index);
2763 inner_classes->at_put(index++, inner_name_index);
2764 inner_classes->at_put(index++, inner_access_flags.as_short());
2765 }
2766
2767 // 4347400: make sure there's no duplicate entry in the classes array
2768 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2769 for(int i = 0; i < length * 4; i += 4) {
2770 for(int j = i + 4; j < length * 4; j += 4) {
2771 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2772 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2773 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2774 inner_classes->at(i+3) != inner_classes->at(j+3)),
2775 "Duplicate entry in InnerClasses in class file %s",
2776 CHECK_0);
2777 }
2778 }
2779 }
2780
2781 // Set EnclosingMethod class and method indexes.
2782 if (parsed_enclosingmethod_attribute) {
2783 inner_classes->at_put(index++, enclosing_method_class_index);
2784 inner_classes->at_put(index++, enclosing_method_method_index);
2785 }
2786 assert(index == size, "wrong size");
2787
2788 // Restore buffer's current position.
2789 cfs->set_current(current_mark);
2790
2791 return length;
2792 }
2793
2794 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2795 set_class_synthetic_flag(true);
2796 }
2797
2798 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2799 ClassFileStream* cfs = stream();
2800 u2 signature_index = cfs->get_u2(CHECK);
2801 check_property(
2802 valid_symbol_at(signature_index),
2803 "Invalid constant pool index %u in Signature attribute in class file %s",
2804 signature_index, CHECK);
2805 set_class_generic_signature_index(signature_index);
2806 }
2807
2808 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2809 ClassFileStream* cfs = stream();
2810 u1* current_start = cfs->current();
2811
2812 guarantee_property(attribute_byte_length >= sizeof(u2),
2813 "Invalid BootstrapMethods attribute length %u in class file %s",
2814 attribute_byte_length,
2815 CHECK);
2816
2817 cfs->guarantee_more(attribute_byte_length, CHECK);
2818
2819 int attribute_array_length = cfs->get_u2_fast();
2820
2821 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2822 "Short length on BootstrapMethods in class file %s",
2823 CHECK);
2824
2825 // The attribute contains a counted array of counted tuples of shorts,
2826 // represending bootstrap specifiers:
2827 // length*{bootstrap_method_index, argument_count*{argument_index}}
2828 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2829 // operand_count = number of shorts in attr, except for leading length
2830
2831 // The attribute is copied into a short[] array.
2832 // The array begins with a series of short[2] pairs, one for each tuple.
2833 int index_size = (attribute_array_length * 2);
2834
2835 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2836
2837 // Eagerly assign operands so they will be deallocated with the constant
2838 // pool if there is an error.
2839 _cp->set_operands(operands);
2840
2841 int operand_fill_index = index_size;
2842 int cp_size = _cp->length();
2843
2844 for (int n = 0; n < attribute_array_length; n++) {
2845 // Store a 32-bit offset into the header of the operand array.
2846 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2847
2848 // Read a bootstrap specifier.
2849 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2850 u2 bootstrap_method_index = cfs->get_u2_fast();
2851 u2 argument_count = cfs->get_u2_fast();
2852 check_property(
2853 valid_cp_range(bootstrap_method_index, cp_size) &&
2854 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2855 "bootstrap_method_index %u has bad constant type in class file %s",
2856 bootstrap_method_index,
2857 CHECK);
2858
2859 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2860 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2861 CHECK);
2862
2863 operands->at_put(operand_fill_index++, bootstrap_method_index);
2864 operands->at_put(operand_fill_index++, argument_count);
2865
2866 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2867 for (int j = 0; j < argument_count; j++) {
2868 u2 argument_index = cfs->get_u2_fast();
2869 check_property(
2870 valid_cp_range(argument_index, cp_size) &&
2871 _cp->tag_at(argument_index).is_loadable_constant(),
2872 "argument_index %u has bad constant type in class file %s",
2873 argument_index,
2874 CHECK);
2875 operands->at_put(operand_fill_index++, argument_index);
2876 }
2877 }
2878
2879 assert(operand_fill_index == operands->length(), "exact fill");
2880
2881 u1* current_end = cfs->current();
2882 guarantee_property(current_end == current_start + attribute_byte_length,
2883 "Bad length on BootstrapMethods in class file %s",
2884 CHECK);
2885 }
2886
2887 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2888 TRAPS) {
2889 ClassFileStream* cfs = stream();
2890 // Set inner classes attribute to default sentinel
2891 _inner_classes = Universe::the_empty_short_array();
2892 cfs->guarantee_more(2, CHECK); // attributes_count
2893 u2 attributes_count = cfs->get_u2_fast();
2894 bool parsed_sourcefile_attribute = false;
2895 bool parsed_innerclasses_attribute = false;
2896 bool parsed_enclosingmethod_attribute = false;
2897 bool parsed_bootstrap_methods_attribute = false;
2898 u1* runtime_visible_annotations = NULL;
2899 int runtime_visible_annotations_length = 0;
2900 u1* runtime_invisible_annotations = NULL;
2901 int runtime_invisible_annotations_length = 0;
2902 u1* runtime_visible_type_annotations = NULL;
2903 int runtime_visible_type_annotations_length = 0;
2904 u1* runtime_invisible_type_annotations = NULL;
2905 int runtime_invisible_type_annotations_length = 0;
2906 bool runtime_invisible_type_annotations_exists = false;
2907 u1* inner_classes_attribute_start = NULL;
2908 u4 inner_classes_attribute_length = 0;
2909 u2 enclosing_method_class_index = 0;
2910 u2 enclosing_method_method_index = 0;
2911 // Iterate over attributes
2912 while (attributes_count--) {
2913 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2914 u2 attribute_name_index = cfs->get_u2_fast();
2915 u4 attribute_length = cfs->get_u4_fast();
2916 check_property(
2917 valid_symbol_at(attribute_name_index),
2918 "Attribute name has bad constant pool index %u in class file %s",
2919 attribute_name_index, CHECK);
2920 Symbol* tag = _cp->symbol_at(attribute_name_index);
2921 if (tag == vmSymbols::tag_source_file()) {
2922 // Check for SourceFile tag
2923 if (_need_verify) {
2924 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2925 }
2926 if (parsed_sourcefile_attribute) {
2927 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2928 } else {
2929 parsed_sourcefile_attribute = true;
2930 }
2931 parse_classfile_sourcefile_attribute(CHECK);
2932 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2933 // Check for SourceDebugExtension tag
2934 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2935 } else if (tag == vmSymbols::tag_inner_classes()) {
2936 // Check for InnerClasses tag
2937 if (parsed_innerclasses_attribute) {
2938 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2939 } else {
2940 parsed_innerclasses_attribute = true;
2941 }
2942 inner_classes_attribute_start = cfs->get_u1_buffer();
2943 inner_classes_attribute_length = attribute_length;
2944 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2945 } else if (tag == vmSymbols::tag_synthetic()) {
2946 // Check for Synthetic tag
2947 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2948 if (attribute_length != 0) {
2949 classfile_parse_error(
2950 "Invalid Synthetic classfile attribute length %u in class file %s",
2951 attribute_length, CHECK);
2952 }
2953 parse_classfile_synthetic_attribute(CHECK);
2954 } else if (tag == vmSymbols::tag_deprecated()) {
2955 // Check for Deprecatd tag - 4276120
2956 if (attribute_length != 0) {
2957 classfile_parse_error(
2958 "Invalid Deprecated classfile attribute length %u in class file %s",
2959 attribute_length, CHECK);
2960 }
2961 } else if (_major_version >= JAVA_1_5_VERSION) {
2962 if (tag == vmSymbols::tag_signature()) {
2963 if (attribute_length != 2) {
2964 classfile_parse_error(
2965 "Wrong Signature attribute length %u in class file %s",
2966 attribute_length, CHECK);
2967 }
2968 parse_classfile_signature_attribute(CHECK);
2969 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2970 runtime_visible_annotations_length = attribute_length;
2971 runtime_visible_annotations = cfs->get_u1_buffer();
2972 assert(runtime_visible_annotations != NULL, "null visible annotations");
2973 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
2974 parse_annotations(runtime_visible_annotations,
2975 runtime_visible_annotations_length,
2976 parsed_annotations,
2977 CHECK);
2978 cfs->skip_u1_fast(runtime_visible_annotations_length);
2979 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2980 runtime_invisible_annotations_length = attribute_length;
2981 runtime_invisible_annotations = cfs->get_u1_buffer();
2982 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2983 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2984 } else if (tag == vmSymbols::tag_enclosing_method()) {
2985 if (parsed_enclosingmethod_attribute) {
2986 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2987 } else {
2988 parsed_enclosingmethod_attribute = true;
2989 }
2990 cfs->guarantee_more(4, CHECK); // class_index, method_index
2991 enclosing_method_class_index = cfs->get_u2_fast();
2992 enclosing_method_method_index = cfs->get_u2_fast();
2993 if (enclosing_method_class_index == 0) {
2994 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2995 }
2996 // Validate the constant pool indices and types
2997 check_property(valid_klass_reference_at(enclosing_method_class_index),
2998 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2999 if (enclosing_method_method_index != 0 &&
3000 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3001 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3002 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3003 }
3004 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3005 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3006 if (parsed_bootstrap_methods_attribute)
3007 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3008 parsed_bootstrap_methods_attribute = true;
3009 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3010 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3011 if (runtime_visible_type_annotations != NULL) {
3012 classfile_parse_error(
3013 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3014 }
3015 runtime_visible_type_annotations_length = attribute_length;
3016 runtime_visible_type_annotations = cfs->get_u1_buffer();
3017 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3018 // No need for the VM to parse Type annotations
3019 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3020 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3021 if (runtime_invisible_type_annotations_exists) {
3022 classfile_parse_error(
3023 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3024 } else {
3025 runtime_invisible_type_annotations_exists = true;
3026 }
3027 if (PreserveAllAnnotations) {
3028 runtime_invisible_type_annotations_length = attribute_length;
3029 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3030 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3031 }
3032 cfs->skip_u1(attribute_length, CHECK);
3033 } else {
3034 // Unknown attribute
3035 cfs->skip_u1(attribute_length, CHECK);
3036 }
3037 } else {
3038 // Unknown attribute
3039 cfs->skip_u1(attribute_length, CHECK);
3040 }
3041 }
3042 _annotations = assemble_annotations(runtime_visible_annotations,
3043 runtime_visible_annotations_length,
3044 runtime_invisible_annotations,
3045 runtime_invisible_annotations_length,
3046 CHECK);
3047 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3048 runtime_visible_type_annotations_length,
3049 runtime_invisible_type_annotations,
3050 runtime_invisible_type_annotations_length,
3051 CHECK);
3052
3053 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3054 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3055 inner_classes_attribute_start,
3056 parsed_innerclasses_attribute,
3057 enclosing_method_class_index,
3058 enclosing_method_method_index,
3059 CHECK);
3060 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3061 guarantee_property(
3062 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3063 "Wrong InnerClasses attribute length in class file %s", CHECK);
3064 }
3065 }
3066
3067 if (_max_bootstrap_specifier_index >= 0) {
3068 guarantee_property(parsed_bootstrap_methods_attribute,
3069 "Missing BootstrapMethods attribute in class file %s", CHECK);
3070 }
3071 }
3072
3073 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3074 if (_synthetic_flag)
3075 k->set_is_synthetic();
3076 if (_sourcefile_index != 0) {
3077 k->set_source_file_name_index(_sourcefile_index);
3078 }
3079 if (_generic_signature_index != 0) {
3080 k->set_generic_signature_index(_generic_signature_index);
3081 }
3082 if (_sde_buffer != NULL) {
3083 k->set_source_debug_extension(_sde_buffer, _sde_length);
3084 }
3085 }
3086
3087 // Create the Annotations object that will
3088 // hold the annotations array for the Klass.
3089 void ClassFileParser::create_combined_annotations(TRAPS) {
3090 if (_annotations == NULL &&
3091 _type_annotations == NULL &&
3092 _fields_annotations == NULL &&
3093 _fields_type_annotations == NULL) {
3094 // Don't create the Annotations object unnecessarily.
3095 return;
3096 }
3097
3098 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3099 annotations->set_class_annotations(_annotations);
3100 annotations->set_class_type_annotations(_type_annotations);
3101 annotations->set_fields_annotations(_fields_annotations);
3102 annotations->set_fields_type_annotations(_fields_type_annotations);
3103
3104 // This is the Annotations object that will be
3105 // assigned to InstanceKlass being constructed.
3106 _combined_annotations = annotations;
3107
3108 // The annotations arrays below has been transfered the
3109 // _combined_annotations so these fields can now be cleared.
3110 _annotations = NULL;
3111 _type_annotations = NULL;
3112 _fields_annotations = NULL;
3113 _fields_type_annotations = NULL;
3114 }
3115
3116 // Transfer ownership of metadata allocated to the InstanceKlass.
3117 void ClassFileParser::apply_parsed_class_metadata(
3118 instanceKlassHandle this_klass,
3119 int java_fields_count, TRAPS) {
3120 _cp->set_pool_holder(this_klass());
3121 this_klass->set_constants(_cp);
3122 this_klass->set_fields(_fields, java_fields_count);
3123 this_klass->set_methods(_methods);
3124 this_klass->set_inner_classes(_inner_classes);
3125 this_klass->set_local_interfaces(_local_interfaces);
3126 this_klass->set_transitive_interfaces(_transitive_interfaces);
3127 this_klass->set_annotations(_combined_annotations);
3128
3129 // Clear out these fields so they don't get deallocated by the destructor
3130 clear_class_metadata();
3131 }
3132
3133 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3134 int runtime_visible_annotations_length,
3135 u1* runtime_invisible_annotations,
3136 int runtime_invisible_annotations_length, TRAPS) {
3137 AnnotationArray* annotations = NULL;
3138 if (runtime_visible_annotations != NULL ||
3139 runtime_invisible_annotations != NULL) {
3140 annotations = MetadataFactory::new_array<u1>(_loader_data,
3141 runtime_visible_annotations_length +
3142 runtime_invisible_annotations_length,
3143 CHECK_(annotations));
3144 if (runtime_visible_annotations != NULL) {
3145 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3146 annotations->at_put(i, runtime_visible_annotations[i]);
3147 }
3148 }
3149 if (runtime_invisible_annotations != NULL) {
3150 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3151 int append = runtime_visible_annotations_length+i;
3152 annotations->at_put(append, runtime_invisible_annotations[i]);
3153 }
3154 }
3155 }
3156 return annotations;
3157 }
3158
3159 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3160 TRAPS) {
3161 instanceKlassHandle super_klass;
3162 if (super_class_index == 0) {
3163 check_property(_class_name == vmSymbols::java_lang_Object(),
3164 "Invalid superclass index %u in class file %s",
3165 super_class_index,
3166 CHECK_NULL);
3167 } else {
3168 check_property(valid_klass_reference_at(super_class_index),
3169 "Invalid superclass index %u in class file %s",
3170 super_class_index,
3171 CHECK_NULL);
3172 // The class name should be legal because it is checked when parsing constant pool.
3173 // However, make sure it is not an array type.
3174 bool is_array = false;
3175 if (_cp->tag_at(super_class_index).is_klass()) {
3176 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3177 if (_need_verify)
3178 is_array = super_klass->oop_is_array();
3179 } else if (_need_verify) {
3180 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3181 }
3182 if (_need_verify) {
3183 guarantee_property(!is_array,
3184 "Bad superclass name in class file %s", CHECK_NULL);
3185 }
3186 }
3187 return super_klass;
3188 }
3189
3190
3191 // Values needed for oopmap and InstanceKlass creation
3192 class FieldLayoutInfo : public StackObj {
3193 public:
3194 int* nonstatic_oop_offsets;
3195 unsigned int* nonstatic_oop_counts;
3196 unsigned int nonstatic_oop_map_count;
3197 unsigned int total_oop_map_count;
3198 int instance_size;
3199 int nonstatic_field_size;
3200 int static_field_size;
3201 bool has_nonstatic_fields;
3202 };
3203
3204 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3205 void ClassFileParser::layout_fields(Handle class_loader,
3206 FieldAllocationCount* fac,
3207 ClassAnnotationCollector* parsed_annotations,
3208 FieldLayoutInfo* info,
3209 TRAPS) {
3210
3211 // Field size and offset computation
3212 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3213 int next_static_oop_offset = 0;
3214 int next_static_double_offset = 0;
3215 int next_static_word_offset = 0;
3216 int next_static_short_offset = 0;
3217 int next_static_byte_offset = 0;
3218 int next_nonstatic_oop_offset = 0;
3219 int next_nonstatic_double_offset = 0;
3220 int next_nonstatic_word_offset = 0;
3221 int next_nonstatic_short_offset = 0;
3222 int next_nonstatic_byte_offset = 0;
3223 int first_nonstatic_oop_offset = 0;
3224 int next_nonstatic_field_offset = 0;
3225 int next_nonstatic_padded_offset = 0;
3226
3227 // Count the contended fields by type.
3228 //
3229 // We ignore static fields, because @Contended is not supported for them.
3230 // The layout code below will also ignore the static fields.
3231 int nonstatic_contended_count = 0;
3232 FieldAllocationCount fac_contended;
3233 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3234 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3235 if (fs.is_contended()) {
3236 fac_contended.count[atype]++;
3237 if (!fs.access_flags().is_static()) {
3238 nonstatic_contended_count++;
3239 }
3240 }
3241 }
3242
3243
3244 // Calculate the starting byte offsets
3245 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3246 next_static_double_offset = next_static_oop_offset +
3247 ((fac->count[STATIC_OOP]) * heapOopSize);
3248 if ( fac->count[STATIC_DOUBLE] &&
3249 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3250 Universe::field_type_should_be_aligned(T_LONG)) ) {
3251 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3252 }
3253
3254 next_static_word_offset = next_static_double_offset +
3255 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3256 next_static_short_offset = next_static_word_offset +
3257 ((fac->count[STATIC_WORD]) * BytesPerInt);
3258 next_static_byte_offset = next_static_short_offset +
3259 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3260
3261 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3262 nonstatic_field_size * heapOopSize;
3263
3264 next_nonstatic_field_offset = nonstatic_fields_start;
3265
3266 bool is_contended_class = parsed_annotations->is_contended();
3267
3268 // Class is contended, pad before all the fields
3269 if (is_contended_class) {
3270 next_nonstatic_field_offset += ContendedPaddingWidth;
3271 }
3272
3273 // Compute the non-contended fields count.
3274 // The packing code below relies on these counts to determine if some field
3275 // can be squeezed into the alignment gap. Contended fields are obviously
3276 // exempt from that.
3277 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3278 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3279 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3280 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3281 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3282
3283 // Total non-static fields count, including every contended field
3284 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3285 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3286 fac->count[NONSTATIC_OOP];
3287
3288 bool super_has_nonstatic_fields =
3289 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3290 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3291
3292
3293 // Prepare list of oops for oop map generation.
3294 //
3295 // "offset" and "count" lists are describing the set of contiguous oop
3296 // regions. offset[i] is the start of the i-th region, which then has
3297 // count[i] oops following. Before we know how many regions are required,
3298 // we pessimistically allocate the maps to fit all the oops into the
3299 // distinct regions.
3300 //
3301 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3302 // to figure out if we still need to do this.
3303 int* nonstatic_oop_offsets;
3304 unsigned int* nonstatic_oop_counts;
3305 unsigned int nonstatic_oop_map_count = 0;
3306 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3307
3308 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3309 THREAD, int, max_nonstatic_oop_maps);
3310 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3311 THREAD, unsigned int, max_nonstatic_oop_maps);
3312
3313 first_nonstatic_oop_offset = 0; // will be set for first oop field
3314
3315 bool compact_fields = CompactFields;
3316 int allocation_style = FieldsAllocationStyle;
3317 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3318 assert(false, "0 <= FieldsAllocationStyle <= 2");
3319 allocation_style = 1; // Optimistic
3320 }
3321
3322 // The next classes have predefined hard-coded fields offsets
3323 // (see in JavaClasses::compute_hard_coded_offsets()).
3324 // Use default fields allocation order for them.
3325 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3326 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3327 _class_name == vmSymbols::java_lang_Class() ||
3328 _class_name == vmSymbols::java_lang_ClassLoader() ||
3329 _class_name == vmSymbols::java_lang_ref_Reference() ||
3330 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3331 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3332 _class_name == vmSymbols::java_lang_String() ||
3333 _class_name == vmSymbols::java_lang_Throwable() ||
3334 _class_name == vmSymbols::java_lang_Boolean() ||
3335 _class_name == vmSymbols::java_lang_Character() ||
3336 _class_name == vmSymbols::java_lang_Float() ||
3337 _class_name == vmSymbols::java_lang_Double() ||
3338 _class_name == vmSymbols::java_lang_Byte() ||
3339 _class_name == vmSymbols::java_lang_Short() ||
3340 _class_name == vmSymbols::java_lang_Integer() ||
3341 _class_name == vmSymbols::java_lang_Long())) {
3342 allocation_style = 0; // Allocate oops first
3343 compact_fields = false; // Don't compact fields
3344 }
3345
3346 // Rearrange fields for a given allocation style
3347 if( allocation_style == 0 ) {
3348 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3349 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3350 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3351 (nonstatic_oop_count * heapOopSize);
3352 } else if( allocation_style == 1 ) {
3353 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3354 next_nonstatic_double_offset = next_nonstatic_field_offset;
3355 } else if( allocation_style == 2 ) {
3356 // Fields allocation: oops fields in super and sub classes are together.
3357 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3358 _super_klass->nonstatic_oop_map_size() > 0 ) {
3359 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3360 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3361 OopMapBlock* last_map = first_map + map_count - 1;
3362 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3363 if (next_offset == next_nonstatic_field_offset) {
3364 allocation_style = 0; // allocate oops first
3365 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3366 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3367 (nonstatic_oop_count * heapOopSize);
3368 }
3369 }
3370 if( allocation_style == 2 ) {
3371 allocation_style = 1; // allocate oops last
3372 next_nonstatic_double_offset = next_nonstatic_field_offset;
3373 }
3374 } else {
3375 ShouldNotReachHere();
3376 }
3377
3378 int nonstatic_oop_space_count = 0;
3379 int nonstatic_word_space_count = 0;
3380 int nonstatic_short_space_count = 0;
3381 int nonstatic_byte_space_count = 0;
3382 int nonstatic_oop_space_offset = 0;
3383 int nonstatic_word_space_offset = 0;
3384 int nonstatic_short_space_offset = 0;
3385 int nonstatic_byte_space_offset = 0;
3386
3387 // Try to squeeze some of the fields into the gaps due to
3388 // long/double alignment.
3389 if( nonstatic_double_count > 0 ) {
3390 int offset = next_nonstatic_double_offset;
3391 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3392 if( compact_fields && offset != next_nonstatic_double_offset ) {
3393 // Allocate available fields into the gap before double field.
3394 int length = next_nonstatic_double_offset - offset;
3395 assert(length == BytesPerInt, "");
3396 nonstatic_word_space_offset = offset;
3397 if( nonstatic_word_count > 0 ) {
3398 nonstatic_word_count -= 1;
3399 nonstatic_word_space_count = 1; // Only one will fit
3400 length -= BytesPerInt;
3401 offset += BytesPerInt;
3402 }
3403 nonstatic_short_space_offset = offset;
3404 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3405 nonstatic_short_count -= 1;
3406 nonstatic_short_space_count += 1;
3407 length -= BytesPerShort;
3408 offset += BytesPerShort;
3409 }
3410 nonstatic_byte_space_offset = offset;
3411 while( length > 0 && nonstatic_byte_count > 0 ) {
3412 nonstatic_byte_count -= 1;
3413 nonstatic_byte_space_count += 1;
3414 length -= 1;
3415 }
3416 // Allocate oop field in the gap if there are no other fields for that.
3417 nonstatic_oop_space_offset = offset;
3418 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3419 allocation_style != 0 ) { // when oop fields not first
3420 nonstatic_oop_count -= 1;
3421 nonstatic_oop_space_count = 1; // Only one will fit
3422 length -= heapOopSize;
3423 offset += heapOopSize;
3424 }
3425 }
3426 }
3427
3428 next_nonstatic_word_offset = next_nonstatic_double_offset +
3429 (nonstatic_double_count * BytesPerLong);
3430 next_nonstatic_short_offset = next_nonstatic_word_offset +
3431 (nonstatic_word_count * BytesPerInt);
3432 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3433 (nonstatic_short_count * BytesPerShort);
3434 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3435 nonstatic_byte_count;
3436
3437 // let oops jump before padding with this allocation style
3438 if( allocation_style == 1 ) {
3439 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3440 if( nonstatic_oop_count > 0 ) {
3441 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3442 }
3443 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3444 }
3445
3446 // Iterate over fields again and compute correct offsets.
3447 // The field allocation type was temporarily stored in the offset slot.
3448 // oop fields are located before non-oop fields (static and non-static).
3449 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3450
3451 // skip already laid out fields
3452 if (fs.is_offset_set()) continue;
3453
3454 // contended instance fields are handled below
3455 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3456
3457 int real_offset = 0;
3458 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3459
3460 // pack the rest of the fields
3461 switch (atype) {
3462 case STATIC_OOP:
3463 real_offset = next_static_oop_offset;
3464 next_static_oop_offset += heapOopSize;
3465 break;
3466 case STATIC_BYTE:
3467 real_offset = next_static_byte_offset;
3468 next_static_byte_offset += 1;
3469 break;
3470 case STATIC_SHORT:
3471 real_offset = next_static_short_offset;
3472 next_static_short_offset += BytesPerShort;
3473 break;
3474 case STATIC_WORD:
3475 real_offset = next_static_word_offset;
3476 next_static_word_offset += BytesPerInt;
3477 break;
3478 case STATIC_DOUBLE:
3479 real_offset = next_static_double_offset;
3480 next_static_double_offset += BytesPerLong;
3481 break;
3482 case NONSTATIC_OOP:
3483 if( nonstatic_oop_space_count > 0 ) {
3484 real_offset = nonstatic_oop_space_offset;
3485 nonstatic_oop_space_offset += heapOopSize;
3486 nonstatic_oop_space_count -= 1;
3487 } else {
3488 real_offset = next_nonstatic_oop_offset;
3489 next_nonstatic_oop_offset += heapOopSize;
3490 }
3491 // Update oop maps
3492 if( nonstatic_oop_map_count > 0 &&
3493 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3494 real_offset -
3495 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3496 heapOopSize ) {
3497 // Extend current oop map
3498 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3499 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3500 } else {
3501 // Create new oop map
3502 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3503 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3504 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3505 nonstatic_oop_map_count += 1;
3506 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3507 first_nonstatic_oop_offset = real_offset;
3508 }
3509 }
3510 break;
3511 case NONSTATIC_BYTE:
3512 if( nonstatic_byte_space_count > 0 ) {
3513 real_offset = nonstatic_byte_space_offset;
3514 nonstatic_byte_space_offset += 1;
3515 nonstatic_byte_space_count -= 1;
3516 } else {
3517 real_offset = next_nonstatic_byte_offset;
3518 next_nonstatic_byte_offset += 1;
3519 }
3520 break;
3521 case NONSTATIC_SHORT:
3522 if( nonstatic_short_space_count > 0 ) {
3523 real_offset = nonstatic_short_space_offset;
3524 nonstatic_short_space_offset += BytesPerShort;
3525 nonstatic_short_space_count -= 1;
3526 } else {
3527 real_offset = next_nonstatic_short_offset;
3528 next_nonstatic_short_offset += BytesPerShort;
3529 }
3530 break;
3531 case NONSTATIC_WORD:
3532 if( nonstatic_word_space_count > 0 ) {
3533 real_offset = nonstatic_word_space_offset;
3534 nonstatic_word_space_offset += BytesPerInt;
3535 nonstatic_word_space_count -= 1;
3536 } else {
3537 real_offset = next_nonstatic_word_offset;
3538 next_nonstatic_word_offset += BytesPerInt;
3539 }
3540 break;
3541 case NONSTATIC_DOUBLE:
3542 real_offset = next_nonstatic_double_offset;
3543 next_nonstatic_double_offset += BytesPerLong;
3544 break;
3545 default:
3546 ShouldNotReachHere();
3547 }
3548 fs.set_offset(real_offset);
3549 }
3550
3551
3552 // Handle the contended cases.
3553 //
3554 // Each contended field should not intersect the cache line with another contended field.
3555 // In the absence of alignment information, we end up with pessimistically separating
3556 // the fields with full-width padding.
3557 //
3558 // Additionally, this should not break alignment for the fields, so we round the alignment up
3559 // for each field.
3560 if (nonstatic_contended_count > 0) {
3561
3562 // if there is at least one contended field, we need to have pre-padding for them
3563 next_nonstatic_padded_offset += ContendedPaddingWidth;
3564
3565 // collect all contended groups
3566 BitMap bm(_cp->size());
3567 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3568 // skip already laid out fields
3569 if (fs.is_offset_set()) continue;
3570
3571 if (fs.is_contended()) {
3572 bm.set_bit(fs.contended_group());
3573 }
3574 }
3575
3576 int current_group = -1;
3577 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3578
3579 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3580
3581 // skip already laid out fields
3582 if (fs.is_offset_set()) continue;
3583
3584 // skip non-contended fields and fields from different group
3585 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3586
3587 // handle statics below
3588 if (fs.access_flags().is_static()) continue;
3589
3590 int real_offset = 0;
3591 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3592
3593 switch (atype) {
3594 case NONSTATIC_BYTE:
3595 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3596 real_offset = next_nonstatic_padded_offset;
3597 next_nonstatic_padded_offset += 1;
3598 break;
3599
3600 case NONSTATIC_SHORT:
3601 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3602 real_offset = next_nonstatic_padded_offset;
3603 next_nonstatic_padded_offset += BytesPerShort;
3604 break;
3605
3606 case NONSTATIC_WORD:
3607 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3608 real_offset = next_nonstatic_padded_offset;
3609 next_nonstatic_padded_offset += BytesPerInt;
3610 break;
3611
3612 case NONSTATIC_DOUBLE:
3613 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3614 real_offset = next_nonstatic_padded_offset;
3615 next_nonstatic_padded_offset += BytesPerLong;
3616 break;
3617
3618 case NONSTATIC_OOP:
3619 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3620 real_offset = next_nonstatic_padded_offset;
3621 next_nonstatic_padded_offset += heapOopSize;
3622
3623 // Create new oop map
3624 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3625 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3626 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3627 nonstatic_oop_map_count += 1;
3628 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3629 first_nonstatic_oop_offset = real_offset;
3630 }
3631 break;
3632
3633 default:
3634 ShouldNotReachHere();
3635 }
3636
3637 if (fs.contended_group() == 0) {
3638 // Contended group defines the equivalence class over the fields:
3639 // the fields within the same contended group are not inter-padded.
3640 // The only exception is default group, which does not incur the
3641 // equivalence, and so requires intra-padding.
3642 next_nonstatic_padded_offset += ContendedPaddingWidth;
3643 }
3644
3645 fs.set_offset(real_offset);
3646 } // for
3647
3648 // Start laying out the next group.
3649 // Note that this will effectively pad the last group in the back;
3650 // this is expected to alleviate memory contention effects for
3651 // subclass fields and/or adjacent object.
3652 // If this was the default group, the padding is already in place.
3653 if (current_group != 0) {
3654 next_nonstatic_padded_offset += ContendedPaddingWidth;
3655 }
3656 }
3657
3658 // handle static fields
3659 }
3660
3661 // Entire class is contended, pad in the back.
3662 // This helps to alleviate memory contention effects for subclass fields
3663 // and/or adjacent object.
3664 if (is_contended_class) {
3665 next_nonstatic_padded_offset += ContendedPaddingWidth;
3666 }
3667
3668 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3669
3670 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3671 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3672 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3673
3674 int static_field_size = (static_fields_end -
3675 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3676 nonstatic_field_size = nonstatic_field_size +
3677 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3678
3679 int instance_size = align_object_size(instance_end / wordSize);
3680
3681 assert(instance_size == align_object_size(align_size_up(
3682 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3683 wordSize) / wordSize), "consistent layout helper value");
3684
3685 // Invariant: nonstatic_field end/start should only change if there are
3686 // nonstatic fields in the class, or if the class is contended. We compare
3687 // against the non-aligned value, so that end alignment will not fail the
3688 // assert without actually having the fields.
3689 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3690 is_contended_class ||
3691 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3692
3693 // Number of non-static oop map blocks allocated at end of klass.
3694 const unsigned int total_oop_map_count =
3695 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3696 first_nonstatic_oop_offset);
3697
3698 #ifndef PRODUCT
3699 if (PrintFieldLayout) {
3700 print_field_layout(_class_name,
3701 _fields,
3702 _cp,
3703 instance_size,
3704 nonstatic_fields_start,
3705 nonstatic_fields_end,
3706 static_fields_end);
3707 }
3708
3709 #endif
3710 // Pass back information needed for InstanceKlass creation
3711 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3712 info->nonstatic_oop_counts = nonstatic_oop_counts;
3713 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3714 info->total_oop_map_count = total_oop_map_count;
3715 info->instance_size = instance_size;
3716 info->static_field_size = static_field_size;
3717 info->nonstatic_field_size = nonstatic_field_size;
3718 info->has_nonstatic_fields = has_nonstatic_fields;
3719 }
3720
3721
3722 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3723 ClassLoaderData* loader_data,
3724 Handle protection_domain,
3725 KlassHandle host_klass,
3726 GrowableArray<Handle>* cp_patches,
3727 TempNewSymbol& parsed_name,
3728 bool verify,
3729 TRAPS) {
3730
3731 // When a retransformable agent is attached, JVMTI caches the
3732 // class bytes that existed before the first retransformation.
3733 // If RedefineClasses() was used before the retransformable
3734 // agent attached, then the cached class bytes may not be the
3735 // original class bytes.
3736 JvmtiCachedClassFileData *cached_class_file = NULL;
3737 Handle class_loader(THREAD, loader_data->class_loader());
3738 bool has_default_methods = false;
3739 bool declares_default_methods = false;
3740 ResourceMark rm(THREAD);
3741
3742 ClassFileStream* cfs = stream();
3743 // Timing
3744 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3745 JavaThread* jt = (JavaThread*) THREAD;
3746
3747 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3748 ClassLoader::perf_class_parse_selftime(),
3749 NULL,
3750 jt->get_thread_stat()->perf_recursion_counts_addr(),
3751 jt->get_thread_stat()->perf_timers_addr(),
3752 PerfClassTraceTime::PARSE_CLASS);
3753
3754 init_parsed_class_attributes(loader_data);
3755
3756 if (JvmtiExport::should_post_class_file_load_hook()) {
3757 // Get the cached class file bytes (if any) from the class that
3758 // is being redefined or retransformed. We use jvmti_thread_state()
3759 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3760 // a JvmtiThreadState any earlier than necessary. This will help
3761 // avoid the bug described by 7126851.
3762 JvmtiThreadState *state = jt->jvmti_thread_state();
3763 if (state != NULL) {
3764 KlassHandle *h_class_being_redefined =
3765 state->get_class_being_redefined();
3766 if (h_class_being_redefined != NULL) {
3767 instanceKlassHandle ikh_class_being_redefined =
3768 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3769 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3770 }
3771 }
3772
3773 unsigned char* ptr = cfs->buffer();
3774 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3775
3776 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3777 &ptr, &end_ptr, &cached_class_file);
3778
3779 if (ptr != cfs->buffer()) {
3780 // JVMTI agent has modified class file data.
3781 // Set new class file stream using JVMTI agent modified
3782 // class file data.
3783 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3784 set_stream(cfs);
3785 }
3786 }
3787
3788 _host_klass = host_klass;
3789 _cp_patches = cp_patches;
3790
3791 instanceKlassHandle nullHandle;
3792
3793 // Figure out whether we can skip format checking (matching classic VM behavior)
3794 if (DumpSharedSpaces) {
3795 // verify == true means it's a 'remote' class (i.e., non-boot class)
3796 // Verification decision is based on BytecodeVerificationRemote flag
3797 // for those classes.
3798 _need_verify = (verify) ? BytecodeVerificationRemote :
3799 BytecodeVerificationLocal;
3800 } else {
3801 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3802 }
3803
3804 // Set the verify flag in stream
3805 cfs->set_verify(_need_verify);
3806
3807 // Save the class file name for easier error message printing.
3808 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3809
3810 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3811 // Magic value
3812 u4 magic = cfs->get_u4_fast();
3813 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3814 "Incompatible magic value %u in class file %s",
3815 magic, CHECK_(nullHandle));
3816
3817 // Version numbers
3818 u2 minor_version = cfs->get_u2_fast();
3819 u2 major_version = cfs->get_u2_fast();
3820
3821 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3822 ResourceMark rm;
3823 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3824 major_version, minor_version, name->as_C_string());
3825 Exceptions::fthrow(
3826 THREAD_AND_LOCATION,
3827 vmSymbols::java_lang_UnsupportedClassVersionError(),
3828 "Unsupported major.minor version for dump time %u.%u",
3829 major_version,
3830 minor_version);
3831 }
3832
3833 // Check version numbers - we check this even with verifier off
3834 if (!is_supported_version(major_version, minor_version)) {
3835 if (name == NULL) {
3836 Exceptions::fthrow(
3837 THREAD_AND_LOCATION,
3838 vmSymbols::java_lang_UnsupportedClassVersionError(),
3839 "Unsupported class file version %u.%u, "
3840 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3841 major_version,
3842 minor_version,
3843 JAVA_MAX_SUPPORTED_VERSION,
3844 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3845 } else {
3846 ResourceMark rm(THREAD);
3847 Exceptions::fthrow(
3848 THREAD_AND_LOCATION,
3849 vmSymbols::java_lang_UnsupportedClassVersionError(),
3850 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3851 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3852 name->as_C_string(),
3853 major_version,
3854 minor_version,
3855 JAVA_MAX_SUPPORTED_VERSION,
3856 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3857 }
3858 return nullHandle;
3859 }
3860
3861 _major_version = major_version;
3862 _minor_version = minor_version;
3863
3864
3865 // Check if verification needs to be relaxed for this class file
3866 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3867 _relax_verify = Verifier::relax_verify_for(class_loader());
3868
3869 // Constant pool
3870 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3871
3872 int cp_size = cp->length();
3873
3874 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3875
3876 // Access flags
3877 AccessFlags access_flags;
3878 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3879
3880 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3881 // Set abstract bit for old class files for backward compatibility
3882 flags |= JVM_ACC_ABSTRACT;
3883 }
3884 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3885 access_flags.set_flags(flags);
3886
3887 // This class and superclass
3888 u2 this_class_index = cfs->get_u2_fast();
3889 _this_class_index = this_class_index; //used by jfr
3890 check_property(
3891 valid_cp_range(this_class_index, cp_size) &&
3892 cp->tag_at(this_class_index).is_unresolved_klass(),
3893 "Invalid this class index %u in constant pool in class file %s",
3894 this_class_index, CHECK_(nullHandle));
3895
3896 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3897 assert(class_name != NULL, "class_name can't be null");
3898
3899 // It's important to set parsed_name *before* resolving the super class.
3900 // (it's used for cleanup by the caller if parsing fails)
3901 parsed_name = class_name;
3902 // parsed_name is returned and can be used if there's an error, so add to
3903 // its reference count. Caller will decrement the refcount.
3904 parsed_name->increment_refcount();
3905
3906 // Update _class_name which could be null previously to be class_name
3907 _class_name = class_name;
3908
3909 // Don't need to check whether this class name is legal or not.
3910 // It has been checked when constant pool is parsed.
3911 // However, make sure it is not an array type.
3912 if (_need_verify) {
3913 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3914 "Bad class name in class file %s",
3915 CHECK_(nullHandle));
3916 }
3917
3918 Klass* preserve_this_klass; // for storing result across HandleMark
3919
3920 // release all handles when parsing is done
3921 { HandleMark hm(THREAD);
3922
3923 // Checks if name in class file matches requested name
3924 if (name != NULL && class_name != name) {
3925 ResourceMark rm(THREAD);
3926 Exceptions::fthrow(
3927 THREAD_AND_LOCATION,
3928 vmSymbols::java_lang_NoClassDefFoundError(),
3929 "%s (wrong name: %s)",
3930 name->as_C_string(),
3931 class_name->as_C_string()
3932 );
3933 return nullHandle;
3934 }
3935
3936 if (TraceClassLoadingPreorder) {
3937 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3938 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3939 tty->print_cr("]");
3940 }
3941 #if INCLUDE_CDS
3942 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3943 // Only dump the classes that can be stored into CDS archive
3944 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3945 if (name != NULL) {
3946 ResourceMark rm(THREAD);
3947 classlist_file->print_cr("%s", name->as_C_string());
3948 classlist_file->flush();
3949 }
3950 }
3951 }
3952 #endif
3953
3954 u2 super_class_index = cfs->get_u2_fast();
3955 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3956 CHECK_NULL);
3957
3958 // Interfaces
3959 u2 itfs_len = cfs->get_u2_fast();
3960 Array<Klass*>* local_interfaces =
3961 parse_interfaces(itfs_len, protection_domain, _class_name,
3962 &has_default_methods, CHECK_(nullHandle));
3963
3964 u2 java_fields_count = 0;
3965 // Fields (offsets are filled in later)
3966 FieldAllocationCount fac;
3967 Array<u2>* fields = parse_fields(class_name,
3968 access_flags.is_interface(),
3969 &fac, &java_fields_count,
3970 CHECK_(nullHandle));
3971 // Methods
3972 bool has_final_method = false;
3973 AccessFlags promoted_flags;
3974 promoted_flags.set_flags(0);
3975 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3976 &promoted_flags,
3977 &has_final_method,
3978 &declares_default_methods,
3979 CHECK_(nullHandle));
3980 if (declares_default_methods) {
3981 has_default_methods = true;
3982 }
3983
3984 // Additional attributes
3985 ClassAnnotationCollector parsed_annotations;
3986 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3987
3988 // Finalize the Annotations metadata object,
3989 // now that all annotation arrays have been created.
3990 create_combined_annotations(CHECK_(nullHandle));
3991
3992 // Make sure this is the end of class file stream
3993 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3994
3995 if (_class_name == vmSymbols::java_lang_Object()) {
3996 check_property(_local_interfaces == Universe::the_empty_klass_array(),
3997 "java.lang.Object cannot implement an interface in class file %s",
3998 CHECK_(nullHandle));
3999 }
4000 // We check super class after class file is parsed and format is checked
4001 if (super_class_index > 0 && super_klass.is_null()) {
4002 Symbol* sk = cp->klass_name_at(super_class_index);
4003 if (access_flags.is_interface()) {
4004 // Before attempting to resolve the superclass, check for class format
4005 // errors not checked yet.
4006 guarantee_property(sk == vmSymbols::java_lang_Object(),
4007 "Interfaces must have java.lang.Object as superclass in class file %s",
4008 CHECK_(nullHandle));
4009 }
4010 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4011 class_loader,
4012 protection_domain,
4013 true,
4014 CHECK_(nullHandle));
4015
4016 KlassHandle kh (THREAD, k);
4017 super_klass = instanceKlassHandle(THREAD, kh());
4018 }
4019 if (super_klass.not_null()) {
4020
4021 if (super_klass->has_default_methods()) {
4022 has_default_methods = true;
4023 }
4024
4025 if (super_klass->is_interface()) {
4026 ResourceMark rm(THREAD);
4027 Exceptions::fthrow(
4028 THREAD_AND_LOCATION,
4029 vmSymbols::java_lang_IncompatibleClassChangeError(),
4030 "class %s has interface %s as super class",
4031 class_name->as_klass_external_name(),
4032 super_klass->external_name()
4033 );
4034 return nullHandle;
4035 }
4036 // Make sure super class is not final
4037 if (super_klass->is_final()) {
4038 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4039 }
4040 }
4041
4042 // save super klass for error handling.
4043 _super_klass = super_klass;
4044
4045 // Compute the transitive list of all unique interfaces implemented by this class
4046 _transitive_interfaces =
4047 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4048
4049 // sort methods
4050 intArray* method_ordering = sort_methods(methods);
4051
4052 // promote flags from parse_methods() to the klass' flags
4053 access_flags.add_promoted_flags(promoted_flags.as_int());
4054
4055 // Size of Java vtable (in words)
4056 int vtable_size = 0;
4057 int itable_size = 0;
4058 int num_miranda_methods = 0;
4059
4060 GrowableArray<Method*> all_mirandas(20);
4061
4062 klassVtable::compute_vtable_size_and_num_mirandas(
4063 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4064 access_flags, class_loader, class_name, local_interfaces,
4065 CHECK_(nullHandle));
4066
4067 // Size of Java itable (in words)
4068 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4069
4070 FieldLayoutInfo info;
4071 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4072
4073 int total_oop_map_size2 =
4074 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4075
4076 // Compute reference type
4077 ReferenceType rt;
4078 if (super_klass() == NULL) {
4079 rt = REF_NONE;
4080 } else {
4081 rt = super_klass->reference_type();
4082 }
4083
4084 // We can now create the basic Klass* for this klass
4085 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4086 vtable_size,
4087 itable_size,
4088 info.static_field_size,
4089 total_oop_map_size2,
4090 rt,
4091 access_flags,
4092 name,
4093 super_klass(),
4094 !host_klass.is_null(),
4095 CHECK_(nullHandle));
4096 instanceKlassHandle this_klass (THREAD, _klass);
4097
4098 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4099 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4100 "sanity");
4101
4102 // Fill in information already parsed
4103 this_klass->set_should_verify_class(verify);
4104 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4105 this_klass->set_layout_helper(lh);
4106 assert(this_klass->oop_is_instance(), "layout is correct");
4107 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4108 // Not yet: supers are done below to support the new subtype-checking fields
4109 //this_klass->set_super(super_klass());
4110 this_klass->set_class_loader_data(loader_data);
4111 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4112 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4113 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4114
4115 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4116
4117 if (has_final_method) {
4118 this_klass->set_has_final_method();
4119 }
4120 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4121 // The InstanceKlass::_methods_jmethod_ids cache
4122 // is managed on the assumption that the initial cache
4123 // size is equal to the number of methods in the class. If
4124 // that changes, then InstanceKlass::idnum_can_increment()
4125 // has to be changed accordingly.
4126 this_klass->set_initial_method_idnum(methods->length());
4127 this_klass->set_name(cp->klass_name_at(this_class_index));
4128 if (is_anonymous()) // I am well known to myself
4129 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4130
4131 this_klass->set_minor_version(minor_version);
4132 this_klass->set_major_version(major_version);
4133 this_klass->set_has_default_methods(has_default_methods);
4134 this_klass->set_declares_default_methods(declares_default_methods);
4135
4136 if (!host_klass.is_null()) {
4137 assert (this_klass->is_anonymous(), "should be the same");
4138 this_klass->set_host_klass(host_klass());
4139 }
4140
4141 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4142 // (We used to do this lazily, but now we query it in Rewriter,
4143 // which is eagerly done for every method, so we might as well do it now,
4144 // when everything is fresh in memory.)
4145 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4146 for (int j = 0; j < methods->length(); j++) {
4147 methods->at(j)->init_intrinsic_id();
4148 }
4149 }
4150
4151 if (cached_class_file != NULL) {
4152 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4153 this_klass->set_cached_class_file(cached_class_file);
4154 }
4155
4156 // Fill in field values obtained by parse_classfile_attributes
4157 if (parsed_annotations.has_any_annotations())
4158 parsed_annotations.apply_to(this_klass);
4159 apply_parsed_class_attributes(this_klass);
4160
4161 // Miranda methods
4162 if ((num_miranda_methods > 0) ||
4163 // if this class introduced new miranda methods or
4164 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4165 // super class exists and this class inherited miranda methods
4166 ) {
4167 this_klass->set_has_miranda_methods(); // then set a flag
4168 }
4169
4170 // Fill in information needed to compute superclasses.
4171 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4172
4173 // Initialize itable offset tables
4174 klassItable::setup_itable_offset_table(this_klass);
4175
4176 // Compute transitive closure of interfaces this class implements
4177 // Do final class setup
4178 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4179
4180 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4181 set_precomputed_flags(this_klass);
4182
4183 // reinitialize modifiers, using the InnerClasses attribute
4184 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4185 this_klass->set_modifier_flags(computed_modifiers);
4186
4187 // check if this class can access its super class
4188 check_super_class_access(this_klass, CHECK_(nullHandle));
4189
4190 // check if this class can access its superinterfaces
4191 check_super_interface_access(this_klass, CHECK_(nullHandle));
4192
4193 // check if this class overrides any final method
4194 check_final_method_override(this_klass, CHECK_(nullHandle));
4195
4196 // check that if this class is an interface then it doesn't have static methods
4197 if (this_klass->is_interface()) {
4198 /* An interface in a JAVA 8 classfile can be static */
4199 if (_major_version < JAVA_8_VERSION) {
4200 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4201 }
4202 }
4203
4204 // Allocate mirror and initialize static fields
4205 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4206 CHECK_(nullHandle));
4207
4208 // Generate any default methods - default methods are interface methods
4209 // that have a default implementation. This is new with Lambda project.
4210 if (has_default_methods ) {
4211 DefaultMethods::generate_default_methods(
4212 this_klass(), &all_mirandas, CHECK_(nullHandle));
4213 }
4214
4215 // Update the loader_data graph.
4216 record_defined_class_dependencies(this_klass, CHECK_NULL);
4217
4218 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4219 false /* not shared class */);
4220 TRACE_INIT_ID(InstanceKlass::cast(this_klass()));
4221
4222 if (TraceClassLoading) {
4223 ResourceMark rm;
4224 // print in a single call to reduce interleaving of output
4225 if (cfs->source() != NULL) {
4226 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4227 cfs->source());
4228 } else if (class_loader.is_null()) {
4229 Klass* caller =
4230 THREAD->is_Java_thread()
4231 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4232 : NULL;
4233 // caller can be NULL, for example, during a JVMTI VM_Init hook
4234 if (caller != NULL) {
4235 tty->print("[Loaded %s by instance of %s]\n",
4236 this_klass->external_name(),
4237 InstanceKlass::cast(caller)->external_name());
4238 } else {
4239 tty->print("[Loaded %s]\n", this_klass->external_name());
4240 }
4241 } else {
4242 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4243 InstanceKlass::cast(class_loader->klass())->external_name());
4244 }
4245 }
4246
4247 if (TraceClassResolution) {
4248 ResourceMark rm;
4249 // print out the superclass.
4250 const char * from = this_klass()->external_name();
4251 if (this_klass->java_super() != NULL) {
4252 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4253 }
4254 // print out each of the interface classes referred to by this class.
4255 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4256 if (local_interfaces != NULL) {
4257 int length = local_interfaces->length();
4258 for (int i = 0; i < length; i++) {
4259 Klass* k = local_interfaces->at(i);
4260 InstanceKlass* to_class = InstanceKlass::cast(k);
4261 const char * to = to_class->external_name();
4262 tty->print("RESOLVE %s %s (interface)\n", from, to);
4263 }
4264 }
4265 }
4266
4267 // preserve result across HandleMark
4268 preserve_this_klass = this_klass();
4269 }
4270
4271 // Create new handle outside HandleMark (might be needed for
4272 // Extended Class Redefinition)
4273 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4274 debug_only(this_klass->verify();)
4275
4276 // Clear class if no error has occurred so destructor doesn't deallocate it
4277 _klass = NULL;
4278 return this_klass;
4279 }
4280
4281 // Destructor to clean up if there's an error
4282 ClassFileParser::~ClassFileParser() {
4283 MetadataFactory::free_metadata(_loader_data, _cp);
4284 MetadataFactory::free_array<u2>(_loader_data, _fields);
4285
4286 // Free methods
4287 InstanceKlass::deallocate_methods(_loader_data, _methods);
4288
4289 // beware of the Universe::empty_blah_array!!
4290 if (_inner_classes != Universe::the_empty_short_array()) {
4291 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4292 }
4293
4294 // Free interfaces
4295 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4296 _local_interfaces, _transitive_interfaces);
4297
4298 if (_combined_annotations != NULL) {
4299 // After all annotations arrays have been created, they are installed into the
4300 // Annotations object that will be assigned to the InstanceKlass being created.
4301
4302 // Deallocate the Annotations object and the installed annotations arrays.
4303 _combined_annotations->deallocate_contents(_loader_data);
4304
4305 // If the _combined_annotations pointer is non-NULL,
4306 // then the other annotations fields should have been cleared.
4307 assert(_annotations == NULL, "Should have been cleared");
4308 assert(_type_annotations == NULL, "Should have been cleared");
4309 assert(_fields_annotations == NULL, "Should have been cleared");
4310 assert(_fields_type_annotations == NULL, "Should have been cleared");
4311 } else {
4312 // If the annotations arrays were not installed into the Annotations object,
4313 // then they have to be deallocated explicitly.
4314 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4315 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4316 Annotations::free_contents(_loader_data, _fields_annotations);
4317 Annotations::free_contents(_loader_data, _fields_type_annotations);
4318 }
4319
4320 clear_class_metadata();
4321
4322 // deallocate the klass if already created. Don't directly deallocate, but add
4323 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4324 // at a safepoint.
4325 if (_klass != NULL) {
4326 _loader_data->add_to_deallocate_list(_klass);
4327 }
4328 _klass = NULL;
4329 }
4330
4331 void ClassFileParser::print_field_layout(Symbol* name,
4332 Array<u2>* fields,
4333 constantPoolHandle cp,
4334 int instance_size,
4335 int instance_fields_start,
4336 int instance_fields_end,
4337 int static_fields_end) {
4338 tty->print("%s: field layout\n", name->as_klass_external_name());
4339 tty->print(" @%3d %s\n", instance_fields_start, "--- instance 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", instance_fields_end, "--- instance fields end ---");
4349 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4350 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4351 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4352 if (fs.access_flags().is_static()) {
4353 tty->print(" @%3d \"%s\" %s\n",
4354 fs.offset(),
4355 fs.name()->as_klass_external_name(),
4356 fs.signature()->as_klass_external_name());
4357 }
4358 }
4359 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4360 tty->print("\n");
4361 }
4362
4363 unsigned int
4364 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4365 unsigned int nonstatic_oop_map_count,
4366 int first_nonstatic_oop_offset) {
4367 unsigned int map_count =
4368 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4369 if (nonstatic_oop_map_count > 0) {
4370 // We have oops to add to map
4371 if (map_count == 0) {
4372 map_count = nonstatic_oop_map_count;
4373 } else {
4374 // Check whether we should add a new map block or whether the last one can
4375 // be extended
4376 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4377 OopMapBlock* const last_map = first_map + map_count - 1;
4378
4379 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4380 if (next_offset == first_nonstatic_oop_offset) {
4381 // There is no gap bettwen superklass's last oop field and first
4382 // local oop field, merge maps.
4383 nonstatic_oop_map_count -= 1;
4384 } else {
4385 // Superklass didn't end with a oop field, add extra maps
4386 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4387 }
4388 map_count += nonstatic_oop_map_count;
4389 }
4390 }
4391 return map_count;
4392 }
4393
4394
4395 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4396 unsigned int nonstatic_oop_map_count,
4397 int* nonstatic_oop_offsets,
4398 unsigned int* nonstatic_oop_counts) {
4399 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4400 const InstanceKlass* const super = k->superklass();
4401 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4402 if (super_count > 0) {
4403 // Copy maps from superklass
4404 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4405 for (unsigned int i = 0; i < super_count; ++i) {
4406 *this_oop_map++ = *super_oop_map++;
4407 }
4408 }
4409
4410 if (nonstatic_oop_map_count > 0) {
4411 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4412 // The counts differ because there is no gap between superklass's last oop
4413 // field and the first local oop field. Extend the last oop map copied
4414 // from the superklass instead of creating new one.
4415 nonstatic_oop_map_count--;
4416 nonstatic_oop_offsets++;
4417 this_oop_map--;
4418 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4419 this_oop_map++;
4420 }
4421
4422 // Add new map blocks, fill them
4423 while (nonstatic_oop_map_count-- > 0) {
4424 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4425 this_oop_map->set_count(*nonstatic_oop_counts++);
4426 this_oop_map++;
4427 }
4428 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4429 this_oop_map, "sanity");
4430 }
4431 }
4432
4433
4434 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4435 Klass* super = k->super();
4436
4437 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4438 // in which case we don't have to register objects as finalizable
4439 if (!_has_empty_finalizer) {
4440 if (_has_finalizer ||
4441 (super != NULL && super->has_finalizer())) {
4442 k->set_has_finalizer();
4443 }
4444 }
4445
4446 #ifdef ASSERT
4447 bool f = false;
4448 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4449 vmSymbols::void_method_signature());
4450 if (m != NULL && !m->is_empty_method()) {
4451 f = true;
4452 }
4453
4454 // Spec doesn't prevent agent from redefinition of empty finalizer.
4455 // Despite the fact that it's generally bad idea and redefined finalizer
4456 // will not work as expected we shouldn't abort vm in this case
4457 if (!k->has_redefined_this_or_super()) {
4458 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4459 }
4460 #endif
4461
4462 // Check if this klass supports the java.lang.Cloneable interface
4463 if (SystemDictionary::Cloneable_klass_loaded()) {
4464 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4465 k->set_is_cloneable();
4466 }
4467 }
4468
4469 // Check if this klass has a vanilla default constructor
4470 if (super == NULL) {
4471 // java.lang.Object has empty default constructor
4472 k->set_has_vanilla_constructor();
4473 } else {
4474 if (super->has_vanilla_constructor() &&
4475 _has_vanilla_constructor) {
4476 k->set_has_vanilla_constructor();
4477 }
4478 #ifdef ASSERT
4479 bool v = false;
4480 if (super->has_vanilla_constructor()) {
4481 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4482 ), vmSymbols::void_method_signature());
4483 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4484 v = true;
4485 }
4486 }
4487 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4488 #endif
4489 }
4490
4491 // If it cannot be fast-path allocated, set a bit in the layout helper.
4492 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4493 assert(k->size_helper() > 0, "layout_helper is initialized");
4494 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4495 || k->is_abstract() || k->is_interface()
4496 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4497 || k->size_helper() >= FastAllocateSizeLimit) {
4498 // Forbid fast-path allocation.
4499 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4500 k->set_layout_helper(lh);
4501 }
4502 }
4503
4504 // Attach super classes and interface classes to class loader data
4505 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4506 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4507 if (defining_loader_data->is_the_null_class_loader_data()) {
4508 // Dependencies to null class loader data are implicit.
4509 return;
4510 } else {
4511 // add super class dependency
4512 Klass* super = defined_klass->super();
4513 if (super != NULL) {
4514 defining_loader_data->record_dependency(super, CHECK);
4515 }
4516
4517 // add super interface dependencies
4518 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4519 if (local_interfaces != NULL) {
4520 int length = local_interfaces->length();
4521 for (int i = 0; i < length; i++) {
4522 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4523 }
4524 }
4525 }
4526 }
4527
4528 // utility methods for appending an array with check for duplicates
4529
4530 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4531 // iterate over new interfaces
4532 for (int i = 0; i < ifs->length(); i++) {
4533 Klass* e = ifs->at(i);
4534 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4535 // add new interface
4536 result->append_if_missing(e);
4537 }
4538 }
4539
4540 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4541 instanceKlassHandle super,
4542 Array<Klass*>* local_ifs, TRAPS) {
4543 // Compute maximum size for transitive interfaces
4544 int max_transitive_size = 0;
4545 int super_size = 0;
4546 // Add superclass transitive interfaces size
4547 if (super.not_null()) {
4548 super_size = super->transitive_interfaces()->length();
4549 max_transitive_size += super_size;
4550 }
4551 // Add local interfaces' super interfaces
4552 int local_size = local_ifs->length();
4553 for (int i = 0; i < local_size; i++) {
4554 Klass* l = local_ifs->at(i);
4555 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4556 }
4557 // Finally add local interfaces
4558 max_transitive_size += local_size;
4559 // Construct array
4560 if (max_transitive_size == 0) {
4561 // no interfaces, use canonicalized array
4562 return Universe::the_empty_klass_array();
4563 } else if (max_transitive_size == super_size) {
4564 // no new local interfaces added, share superklass' transitive interface array
4565 return super->transitive_interfaces();
4566 } else if (max_transitive_size == local_size) {
4567 // only local interfaces added, share local interface array
4568 return local_ifs;
4569 } else {
4570 ResourceMark rm;
4571 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4572
4573 // Copy down from superclass
4574 if (super.not_null()) {
4575 append_interfaces(result, super->transitive_interfaces());
4576 }
4577
4578 // Copy down from local interfaces' superinterfaces
4579 for (int i = 0; i < local_ifs->length(); i++) {
4580 Klass* l = local_ifs->at(i);
4581 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4582 }
4583 // Finally add local interfaces
4584 append_interfaces(result, local_ifs);
4585
4586 // length will be less than the max_transitive_size if duplicates were removed
4587 int length = result->length();
4588 assert(length <= max_transitive_size, "just checking");
4589 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4590 for (int i = 0; i < length; i++) {
4591 Klass* e = result->at(i);
4592 assert(e != NULL, "just checking");
4593 new_result->at_put(i, e);
4594 }
4595 return new_result;
4596 }
4597 }
4598
4599 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4600 Klass* super = this_klass->super();
4601 if ((super != NULL) &&
4602 (!Reflection::verify_class_access(this_klass(), super, false))) {
4603 ResourceMark rm(THREAD);
4604 Exceptions::fthrow(
4605 THREAD_AND_LOCATION,
4606 vmSymbols::java_lang_IllegalAccessError(),
4607 "class %s cannot access its superclass %s",
4608 this_klass->external_name(),
4609 InstanceKlass::cast(super)->external_name()
4610 );
4611 return;
4612 }
4613 }
4614
4615
4616 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4617 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4618 int lng = local_interfaces->length();
4619 for (int i = lng - 1; i >= 0; i--) {
4620 Klass* k = local_interfaces->at(i);
4621 assert (k != NULL && k->is_interface(), "invalid interface");
4622 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4623 ResourceMark rm(THREAD);
4624 Exceptions::fthrow(
4625 THREAD_AND_LOCATION,
4626 vmSymbols::java_lang_IllegalAccessError(),
4627 "class %s cannot access its superinterface %s",
4628 this_klass->external_name(),
4629 InstanceKlass::cast(k)->external_name()
4630 );
4631 return;
4632 }
4633 }
4634 }
4635
4636
4637 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4638 Array<Method*>* methods = this_klass->methods();
4639 int num_methods = methods->length();
4640
4641 // go thru each method and check if it overrides a final method
4642 for (int index = 0; index < num_methods; index++) {
4643 Method* m = methods->at(index);
4644
4645 // skip private, static, and <init> methods
4646 if ((!m->is_private() && !m->is_static()) &&
4647 (m->name() != vmSymbols::object_initializer_name())) {
4648
4649 Symbol* name = m->name();
4650 Symbol* signature = m->signature();
4651 Klass* k = this_klass->super();
4652 Method* super_m = NULL;
4653 while (k != NULL) {
4654 // skip supers that don't have final methods.
4655 if (k->has_final_method()) {
4656 // lookup a matching method in the super class hierarchy
4657 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4658 if (super_m == NULL) {
4659 break; // didn't find any match; get out
4660 }
4661
4662 if (super_m->is_final() && !super_m->is_static() &&
4663 // matching method in super is final, and not static
4664 (Reflection::verify_field_access(this_klass(),
4665 super_m->method_holder(),
4666 super_m->method_holder(),
4667 super_m->access_flags(), false))
4668 // this class can access super final method and therefore override
4669 ) {
4670 ResourceMark rm(THREAD);
4671 Exceptions::fthrow(
4672 THREAD_AND_LOCATION,
4673 vmSymbols::java_lang_VerifyError(),
4674 "class %s overrides final method %s.%s",
4675 this_klass->external_name(),
4676 name->as_C_string(),
4677 signature->as_C_string()
4678 );
4679 return;
4680 }
4681
4682 // continue to look from super_m's holder's super.
4683 k = super_m->method_holder()->super();
4684 continue;
4685 }
4686
4687 k = k->super();
4688 }
4689 }
4690 }
4691 }
4692
4693
4694 // assumes that this_klass is an interface
4695 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4696 assert(this_klass->is_interface(), "not an interface");
4697 Array<Method*>* methods = this_klass->methods();
4698 int num_methods = methods->length();
4699
4700 for (int index = 0; index < num_methods; index++) {
4701 Method* m = methods->at(index);
4702 // if m is static and not the init method, throw a verify error
4703 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4704 ResourceMark rm(THREAD);
4705 Exceptions::fthrow(
4706 THREAD_AND_LOCATION,
4707 vmSymbols::java_lang_VerifyError(),
4708 "Illegal static method %s in interface %s",
4709 m->name()->as_C_string(),
4710 this_klass->external_name()
4711 );
4712 return;
4713 }
4714 }
4715 }
4716
4717 // utility methods for format checking
4718
4719 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4720 if (!_need_verify) { return; }
4721
4722 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4723 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4724 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4725 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4726 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4727 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4728 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4729
4730 if ((is_abstract && is_final) ||
4731 (is_interface && !is_abstract) ||
4732 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4733 (!is_interface && major_gte_15 && is_annotation)) {
4734 ResourceMark rm(THREAD);
4735 Exceptions::fthrow(
4736 THREAD_AND_LOCATION,
4737 vmSymbols::java_lang_ClassFormatError(),
4738 "Illegal class modifiers in class %s: 0x%X",
4739 _class_name->as_C_string(), flags
4740 );
4741 return;
4742 }
4743 }
4744
4745 bool ClassFileParser::has_illegal_visibility(jint flags) {
4746 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4747 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4748 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4749
4750 return ((is_public && is_protected) ||
4751 (is_public && is_private) ||
4752 (is_protected && is_private));
4753 }
4754
4755 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4756 u2 max_version =
4757 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4758 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4759 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4760 (major <= max_version) &&
4761 ((major != max_version) ||
4762 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4763 }
4764
4765 void ClassFileParser::verify_legal_field_modifiers(
4766 jint flags, bool is_interface, TRAPS) {
4767 if (!_need_verify) { return; }
4768
4769 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4770 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4771 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4772 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4773 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4774 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4775 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4776 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4777 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4778
4779 bool is_illegal = false;
4780
4781 if (is_interface) {
4782 if (!is_public || !is_static || !is_final || is_private ||
4783 is_protected || is_volatile || is_transient ||
4784 (major_gte_15 && is_enum)) {
4785 is_illegal = true;
4786 }
4787 } else { // not interface
4788 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4789 is_illegal = true;
4790 }
4791 }
4792
4793 if (is_illegal) {
4794 ResourceMark rm(THREAD);
4795 Exceptions::fthrow(
4796 THREAD_AND_LOCATION,
4797 vmSymbols::java_lang_ClassFormatError(),
4798 "Illegal field modifiers in class %s: 0x%X",
4799 _class_name->as_C_string(), flags);
4800 return;
4801 }
4802 }
4803
4804 void ClassFileParser::verify_legal_method_modifiers(
4805 jint flags, bool is_interface, Symbol* name, TRAPS) {
4806 if (!_need_verify) { return; }
4807
4808 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4809 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4810 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4811 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4812 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4813 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4814 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4815 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4816 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4817 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4818 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4819 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4820 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4821
4822 bool is_illegal = false;
4823
4824 if (is_interface) {
4825 if (major_gte_8) {
4826 // Class file version is JAVA_8_VERSION or later Methods of
4827 // interfaces may set any of the flags except ACC_PROTECTED,
4828 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4829 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4830 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4831 (is_native || is_protected || is_final || is_synchronized) ||
4832 // If a specific method of a class or interface has its
4833 // ACC_ABSTRACT flag set, it must not have any of its
4834 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4835 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4836 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4837 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4838 (is_abstract && (is_private || is_static || is_strict))) {
4839 is_illegal = true;
4840 }
4841 } else if (major_gte_15) {
4842 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4843 if (!is_public || is_static || is_final || is_synchronized ||
4844 is_native || !is_abstract || is_strict) {
4845 is_illegal = true;
4846 }
4847 } else {
4848 // Class file version is pre-JAVA_1_5_VERSION
4849 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4850 is_illegal = true;
4851 }
4852 }
4853 } else { // not interface
4854 if (is_initializer) {
4855 if (is_static || is_final || is_synchronized || is_native ||
4856 is_abstract || (major_gte_15 && is_bridge)) {
4857 is_illegal = true;
4858 }
4859 } else { // not initializer
4860 if (is_abstract) {
4861 if ((is_final || is_native || is_private || is_static ||
4862 (major_gte_15 && (is_synchronized || is_strict)))) {
4863 is_illegal = true;
4864 }
4865 }
4866 if (has_illegal_visibility(flags)) {
4867 is_illegal = true;
4868 }
4869 }
4870 }
4871
4872 if (is_illegal) {
4873 ResourceMark rm(THREAD);
4874 Exceptions::fthrow(
4875 THREAD_AND_LOCATION,
4876 vmSymbols::java_lang_ClassFormatError(),
4877 "Method %s in class %s has illegal modifiers: 0x%X",
4878 name->as_C_string(), _class_name->as_C_string(), flags);
4879 return;
4880 }
4881 }
4882
4883 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4884 assert(_need_verify, "only called when _need_verify is true");
4885 int i = 0;
4886 int count = length >> 2;
4887 for (int k=0; k<count; k++) {
4888 unsigned char b0 = buffer[i];
4889 unsigned char b1 = buffer[i+1];
4890 unsigned char b2 = buffer[i+2];
4891 unsigned char b3 = buffer[i+3];
4892 // For an unsigned char v,
4893 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4894 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4895 unsigned char res = b0 | b0 - 1 |
4896 b1 | b1 - 1 |
4897 b2 | b2 - 1 |
4898 b3 | b3 - 1;
4899 if (res >= 128) break;
4900 i += 4;
4901 }
4902 for(; i < length; i++) {
4903 unsigned short c;
4904 // no embedded zeros
4905 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4906 if(buffer[i] < 128) {
4907 continue;
4908 }
4909 if ((i + 5) < length) { // see if it's legal supplementary character
4910 if (UTF8::is_supplementary_character(&buffer[i])) {
4911 c = UTF8::get_supplementary_character(&buffer[i]);
4912 i += 5;
4913 continue;
4914 }
4915 }
4916 switch (buffer[i] >> 4) {
4917 default: break;
4918 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4919 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4920 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4921 c = (buffer[i] & 0x1F) << 6;
4922 i++;
4923 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4924 c += buffer[i] & 0x3F;
4925 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4926 // for classes with major > 47, c must a null or a character in its shortest form
4927 break;
4928 }
4929 }
4930 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4931 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4932 c = (buffer[i] & 0xF) << 12;
4933 i += 2;
4934 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4935 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4936 if (_major_version <= 47 || c >= 0x800) {
4937 // for classes with major > 47, c must be in its shortest form
4938 break;
4939 }
4940 }
4941 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4942 } // end of switch
4943 } // end of for
4944 }
4945
4946 // Checks if name is a legal class name.
4947 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4948 if (!_need_verify || _relax_verify) { return; }
4949
4950 char buf[fixed_buffer_size];
4951 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4952 unsigned int length = name->utf8_length();
4953 bool legal = false;
4954
4955 if (length > 0) {
4956 char* p;
4957 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4958 p = skip_over_field_signature(bytes, false, length, CHECK);
4959 legal = (p != NULL) && ((p - bytes) == (int)length);
4960 } else if (_major_version < JAVA_1_5_VERSION) {
4961 if (bytes[0] != '<') {
4962 p = skip_over_field_name(bytes, true, length);
4963 legal = (p != NULL) && ((p - bytes) == (int)length);
4964 }
4965 } else {
4966 // 4900761: relax the constraints based on JSR202 spec
4967 // Class names may be drawn from the entire Unicode character set.
4968 // Identifiers between '/' must be unqualified names.
4969 // The utf8 string has been verified when parsing cpool entries.
4970 legal = verify_unqualified_name(bytes, length, LegalClass);
4971 }
4972 }
4973 if (!legal) {
4974 ResourceMark rm(THREAD);
4975 Exceptions::fthrow(
4976 THREAD_AND_LOCATION,
4977 vmSymbols::java_lang_ClassFormatError(),
4978 "Illegal class name \"%s\" in class file %s", bytes,
4979 _class_name->as_C_string()
4980 );
4981 return;
4982 }
4983 }
4984
4985 // Checks if name is a legal field name.
4986 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4987 if (!_need_verify || _relax_verify) { return; }
4988
4989 char buf[fixed_buffer_size];
4990 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4991 unsigned int length = name->utf8_length();
4992 bool legal = false;
4993
4994 if (length > 0) {
4995 if (_major_version < JAVA_1_5_VERSION) {
4996 if (bytes[0] != '<') {
4997 char* p = skip_over_field_name(bytes, false, length);
4998 legal = (p != NULL) && ((p - bytes) == (int)length);
4999 }
5000 } else {
5001 // 4881221: relax the constraints based on JSR202 spec
5002 legal = verify_unqualified_name(bytes, length, LegalField);
5003 }
5004 }
5005
5006 if (!legal) {
5007 ResourceMark rm(THREAD);
5008 Exceptions::fthrow(
5009 THREAD_AND_LOCATION,
5010 vmSymbols::java_lang_ClassFormatError(),
5011 "Illegal field name \"%s\" in class %s", bytes,
5012 _class_name->as_C_string()
5013 );
5014 return;
5015 }
5016 }
5017
5018 // Checks if name is a legal method name.
5019 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5020 if (!_need_verify || _relax_verify) { return; }
5021
5022 assert(name != NULL, "method name is null");
5023 char buf[fixed_buffer_size];
5024 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5025 unsigned int length = name->utf8_length();
5026 bool legal = false;
5027
5028 if (length > 0) {
5029 if (bytes[0] == '<') {
5030 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5031 legal = true;
5032 }
5033 } else if (_major_version < JAVA_1_5_VERSION) {
5034 char* p;
5035 p = skip_over_field_name(bytes, false, length);
5036 legal = (p != NULL) && ((p - bytes) == (int)length);
5037 } else {
5038 // 4881221: relax the constraints based on JSR202 spec
5039 legal = verify_unqualified_name(bytes, length, LegalMethod);
5040 }
5041 }
5042
5043 if (!legal) {
5044 ResourceMark rm(THREAD);
5045 Exceptions::fthrow(
5046 THREAD_AND_LOCATION,
5047 vmSymbols::java_lang_ClassFormatError(),
5048 "Illegal method name \"%s\" in class %s", bytes,
5049 _class_name->as_C_string()
5050 );
5051 return;
5052 }
5053 }
5054
5055
5056 // Checks if signature is a legal field signature.
5057 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5058 if (!_need_verify) { return; }
5059
5060 char buf[fixed_buffer_size];
5061 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5062 unsigned int length = signature->utf8_length();
5063 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5064
5065 if (p == NULL || (p - bytes) != (int)length) {
5066 throwIllegalSignature("Field", name, signature, CHECK);
5067 }
5068 }
5069
5070 // Checks if signature is a legal method signature.
5071 // Returns number of parameters
5072 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5073 if (!_need_verify) {
5074 // make sure caller's args_size will be less than 0 even for non-static
5075 // method so it will be recomputed in compute_size_of_parameters().
5076 return -2;
5077 }
5078
5079 unsigned int args_size = 0;
5080 char buf[fixed_buffer_size];
5081 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5082 unsigned int length = signature->utf8_length();
5083 char* nextp;
5084
5085 // The first character must be a '('
5086 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5087 length--;
5088 // Skip over legal field signatures
5089 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5090 while ((length > 0) && (nextp != NULL)) {
5091 args_size++;
5092 if (p[0] == 'J' || p[0] == 'D') {
5093 args_size++;
5094 }
5095 length -= nextp - p;
5096 p = nextp;
5097 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5098 }
5099 // The first non-signature thing better be a ')'
5100 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5101 length--;
5102 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5103 // All internal methods must return void
5104 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5105 return args_size;
5106 }
5107 } else {
5108 // Now we better just have a return value
5109 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5110 if (nextp && ((int)length == (nextp - p))) {
5111 return args_size;
5112 }
5113 }
5114 }
5115 }
5116 // Report error
5117 throwIllegalSignature("Method", name, signature, CHECK_0);
5118 return 0;
5119 }
5120
5121
5122 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5123 // Method names also may not contain the characters '<' or '>', unless <init>
5124 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5125 // method. Because these names have been checked as special cases before
5126 // calling this method in verify_legal_method_name.
5127 bool ClassFileParser::verify_unqualified_name(
5128 char* name, unsigned int length, int type) {
5129 jchar ch;
5130
5131 for (char* p = name; p != name + length; ) {
5132 ch = *p;
5133 if (ch < 128) {
5134 p++;
5135 if (ch == '.' || ch == ';' || ch == '[' ) {
5136 return false; // do not permit '.', ';', or '['
5137 }
5138 if (type != LegalClass && ch == '/') {
5139 return false; // do not permit '/' unless it's class name
5140 }
5141 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5142 return false; // do not permit '<' or '>' in method names
5143 }
5144 } else {
5145 char* tmp_p = UTF8::next(p, &ch);
5146 p = tmp_p;
5147 }
5148 }
5149 return true;
5150 }
5151
5152
5153 // Take pointer to a string. Skip over the longest part of the string that could
5154 // be taken as a fieldname. Allow '/' if slash_ok is true.
5155 // Return a pointer to just past the fieldname.
5156 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5157 // being true, we saw consecutive slashes (meaning we were looking for a
5158 // qualified path but found something that was badly-formed).
5159 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5160 char* p;
5161 jchar ch;
5162 jboolean last_is_slash = false;
5163 jboolean not_first_ch = false;
5164
5165 for (p = name; p != name + length; not_first_ch = true) {
5166 char* old_p = p;
5167 ch = *p;
5168 if (ch < 128) {
5169 p++;
5170 // quick check for ascii
5171 if ((ch >= 'a' && ch <= 'z') ||
5172 (ch >= 'A' && ch <= 'Z') ||
5173 (ch == '_' || ch == '$') ||
5174 (not_first_ch && ch >= '0' && ch <= '9')) {
5175 last_is_slash = false;
5176 continue;
5177 }
5178 if (slash_ok && ch == '/') {
5179 if (last_is_slash) {
5180 return NULL; // Don't permit consecutive slashes
5181 }
5182 last_is_slash = true;
5183 continue;
5184 }
5185 } else {
5186 jint unicode_ch;
5187 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5188 p = tmp_p;
5189 last_is_slash = false;
5190 // Check if ch is Java identifier start or is Java identifier part
5191 // 4672820: call java.lang.Character methods directly without generating separate tables.
5192 EXCEPTION_MARK;
5193 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5194
5195 // return value
5196 JavaValue result(T_BOOLEAN);
5197 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5198 JavaCallArguments args;
5199 args.push_int(unicode_ch);
5200
5201 // public static boolean isJavaIdentifierStart(char ch);
5202 JavaCalls::call_static(&result,
5203 klass,
5204 vmSymbols::isJavaIdentifierStart_name(),
5205 vmSymbols::int_bool_signature(),
5206 &args,
5207 THREAD);
5208
5209 if (HAS_PENDING_EXCEPTION) {
5210 CLEAR_PENDING_EXCEPTION;
5211 return 0;
5212 }
5213 if (result.get_jboolean()) {
5214 continue;
5215 }
5216
5217 if (not_first_ch) {
5218 // public static boolean isJavaIdentifierPart(char ch);
5219 JavaCalls::call_static(&result,
5220 klass,
5221 vmSymbols::isJavaIdentifierPart_name(),
5222 vmSymbols::int_bool_signature(),
5223 &args,
5224 THREAD);
5225
5226 if (HAS_PENDING_EXCEPTION) {
5227 CLEAR_PENDING_EXCEPTION;
5228 return 0;
5229 }
5230
5231 if (result.get_jboolean()) {
5232 continue;
5233 }
5234 }
5235 }
5236 return (not_first_ch) ? old_p : NULL;
5237 }
5238 return (not_first_ch) ? p : NULL;
5239 }
5240
5241
5242 // Take pointer to a string. Skip over the longest part of the string that could
5243 // be taken as a field signature. Allow "void" if void_ok.
5244 // Return a pointer to just past the signature.
5245 // Return NULL if no legal signature is found.
5246 char* ClassFileParser::skip_over_field_signature(char* signature,
5247 bool void_ok,
5248 unsigned int length,
5249 TRAPS) {
5250 unsigned int array_dim = 0;
5251 while (length > 0) {
5252 switch (signature[0]) {
5253 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5254 case JVM_SIGNATURE_BOOLEAN:
5255 case JVM_SIGNATURE_BYTE:
5256 case JVM_SIGNATURE_CHAR:
5257 case JVM_SIGNATURE_SHORT:
5258 case JVM_SIGNATURE_INT:
5259 case JVM_SIGNATURE_FLOAT:
5260 case JVM_SIGNATURE_LONG:
5261 case JVM_SIGNATURE_DOUBLE:
5262 return signature + 1;
5263 case JVM_SIGNATURE_CLASS: {
5264 if (_major_version < JAVA_1_5_VERSION) {
5265 // Skip over the class name if one is there
5266 char* p = skip_over_field_name(signature + 1, true, --length);
5267
5268 // The next character better be a semicolon
5269 if (p && (p - signature) > 1 && p[0] == ';') {
5270 return p + 1;
5271 }
5272 } else {
5273 // 4900761: For class version > 48, any unicode is allowed in class name.
5274 length--;
5275 signature++;
5276 while (length > 0 && signature[0] != ';') {
5277 if (signature[0] == '.') {
5278 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5279 }
5280 length--;
5281 signature++;
5282 }
5283 if (signature[0] == ';') { return signature + 1; }
5284 }
5285
5286 return NULL;
5287 }
5288 case JVM_SIGNATURE_ARRAY:
5289 array_dim++;
5290 if (array_dim > 255) {
5291 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5292 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5293 }
5294 // The rest of what's there better be a legal signature
5295 signature++;
5296 length--;
5297 void_ok = false;
5298 break;
5299
5300 default:
5301 return NULL;
5302 }
5303 }
5304 return NULL;
5305 }
5306
5307 const ClassFileStream* ClassFileParser::clone_stream() const {
5308 assert(_stream != NULL, "invariant");
5309 return _stream->clone();
5310 }
5311
5312 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5313
5314 #ifdef ASSERT
5315 if (klass != NULL) {
5316 assert(NULL == _klass, "leaking?");
5317 }
5318 #endif
5319
5320 _klass = klass;
5321 }