1 /*
2 * Copyright (c) 1997, 2013, 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/genericSignatures.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/verificationType.hpp"
36 #include "classfile/verifier.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "memory/allocation.hpp"
39 #include "memory/gcLocker.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/instanceMirrorKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/klassVtable.hpp"
49 #include "oops/method.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm.h"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/perfData.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/classLoadingService.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/array.hpp"
62 #include "utilities/globalDefinitions.hpp"
63
64 // We generally try to create the oops directly when parsing, rather than
65 // allocating temporary data structures and copying the bytes twice. A
66 // temporary area is only needed when parsing utf8 entries in the constant
67 // pool and when parsing line number tables.
68
69 // We add assert in debug mode when class format is not checked.
70
71 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
72 #define JAVA_MIN_SUPPORTED_VERSION 45
73 #define JAVA_MAX_SUPPORTED_VERSION 52
74 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
75
76 // Used for two backward compatibility reasons:
77 // - to check for new additions to the class file format in JDK1.5
78 // - to check for bug fixes in the format checker in JDK1.5
79 #define JAVA_1_5_VERSION 49
80
81 // Used for backward compatibility reasons:
82 // - to check for javac bug fixes that happened after 1.5
83 // - also used as the max version when running in jdk6
84 #define JAVA_6_VERSION 50
85
86 // Used for backward compatibility reasons:
87 // - to check NameAndType_info signatures more aggressively
88 #define JAVA_7_VERSION 51
89
90 // Extension method support.
91 #define JAVA_8_VERSION 52
92
93 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
94 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
95 // this function (_current can be allocated in a register, with scalar
96 // replacement of aggregates). The _current pointer is copied back to
97 // stream() when this function returns. DON'T call another method within
98 // this method that uses stream().
99 ClassFileStream* cfs0 = stream();
100 ClassFileStream cfs1 = *cfs0;
101 ClassFileStream* cfs = &cfs1;
102 #ifdef ASSERT
103 assert(cfs->allocated_on_stack(),"should be local");
104 u1* old_current = cfs0->current();
105 #endif
106 Handle class_loader(THREAD, _loader_data->class_loader());
107
108 // Used for batching symbol allocations.
109 const char* names[SymbolTable::symbol_alloc_batch_size];
110 int lengths[SymbolTable::symbol_alloc_batch_size];
111 int indices[SymbolTable::symbol_alloc_batch_size];
112 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
113 int names_count = 0;
114
115 // parsing Index 0 is unused
116 for (int index = 1; index < length; index++) {
117 // Each of the following case guarantees one more byte in the stream
118 // for the following tag or the access_flags following constant pool,
119 // so we don't need bounds-check for reading tag.
120 u1 tag = cfs->get_u1_fast();
121 switch (tag) {
122 case JVM_CONSTANT_Class :
123 {
124 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
125 u2 name_index = cfs->get_u2_fast();
126 _cp->klass_index_at_put(index, name_index);
127 }
128 break;
129 case JVM_CONSTANT_Fieldref :
130 {
131 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
132 u2 class_index = cfs->get_u2_fast();
133 u2 name_and_type_index = cfs->get_u2_fast();
134 _cp->field_at_put(index, class_index, name_and_type_index);
135 }
136 break;
137 case JVM_CONSTANT_Methodref :
138 {
139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
140 u2 class_index = cfs->get_u2_fast();
141 u2 name_and_type_index = cfs->get_u2_fast();
142 _cp->method_at_put(index, class_index, name_and_type_index);
143 }
144 break;
145 case JVM_CONSTANT_InterfaceMethodref :
146 {
147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
148 u2 class_index = cfs->get_u2_fast();
149 u2 name_and_type_index = cfs->get_u2_fast();
150 _cp->interface_method_at_put(index, class_index, name_and_type_index);
151 }
152 break;
153 case JVM_CONSTANT_String :
154 {
155 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
156 u2 string_index = cfs->get_u2_fast();
157 _cp->string_index_at_put(index, string_index);
158 }
159 break;
160 case JVM_CONSTANT_MethodHandle :
161 case JVM_CONSTANT_MethodType :
162 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
163 classfile_parse_error(
164 "Class file version does not support constant tag %u in class file %s",
165 tag, CHECK);
166 }
167 if (!EnableInvokeDynamic) {
168 classfile_parse_error(
169 "This JVM does not support constant tag %u in class file %s",
170 tag, CHECK);
171 }
172 if (tag == JVM_CONSTANT_MethodHandle) {
173 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
174 u1 ref_kind = cfs->get_u1_fast();
175 u2 method_index = cfs->get_u2_fast();
176 _cp->method_handle_index_at_put(index, ref_kind, method_index);
177 } else if (tag == JVM_CONSTANT_MethodType) {
178 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
179 u2 signature_index = cfs->get_u2_fast();
180 _cp->method_type_index_at_put(index, signature_index);
181 } else {
182 ShouldNotReachHere();
183 }
184 break;
185 case JVM_CONSTANT_InvokeDynamic :
186 {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (!EnableInvokeDynamic) {
193 classfile_parse_error(
194 "This JVM does not support constant tag %u in class file %s",
195 tag, CHECK);
196 }
197 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
198 u2 bootstrap_specifier_index = cfs->get_u2_fast();
199 u2 name_and_type_index = cfs->get_u2_fast();
200 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
201 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
202 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
203 }
204 break;
205 case JVM_CONSTANT_Integer :
206 {
207 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
208 u4 bytes = cfs->get_u4_fast();
209 _cp->int_at_put(index, (jint) bytes);
210 }
211 break;
212 case JVM_CONSTANT_Float :
213 {
214 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
215 u4 bytes = cfs->get_u4_fast();
216 _cp->float_at_put(index, *(jfloat*)&bytes);
217 }
218 break;
219 case JVM_CONSTANT_Long :
220 // A mangled type might cause you to overrun allocated memory
221 guarantee_property(index+1 < length,
222 "Invalid constant pool entry %u in class file %s",
223 index, CHECK);
224 {
225 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
226 u8 bytes = cfs->get_u8_fast();
227 _cp->long_at_put(index, bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_Double :
232 // A mangled type might cause you to overrun allocated memory
233 guarantee_property(index+1 < length,
234 "Invalid constant pool entry %u in class file %s",
235 index, CHECK);
236 {
237 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
238 u8 bytes = cfs->get_u8_fast();
239 _cp->double_at_put(index, *(jdouble*)&bytes);
240 }
241 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
242 break;
243 case JVM_CONSTANT_NameAndType :
244 {
245 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
246 u2 name_index = cfs->get_u2_fast();
247 u2 signature_index = cfs->get_u2_fast();
248 _cp->name_and_type_at_put(index, name_index, signature_index);
249 }
250 break;
251 case JVM_CONSTANT_Utf8 :
252 {
253 cfs->guarantee_more(2, CHECK); // utf8_length
254 u2 utf8_length = cfs->get_u2_fast();
255 u1* utf8_buffer = cfs->get_u1_buffer();
256 assert(utf8_buffer != NULL, "null utf8 buffer");
257 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
258 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
259 cfs->skip_u1_fast(utf8_length);
260
261 // Before storing the symbol, make sure it's legal
262 if (_need_verify) {
263 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
264 }
265
266 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
267 Handle patch = clear_cp_patch_at(index);
268 guarantee_property(java_lang_String::is_instance(patch()),
269 "Illegal utf8 patch at %d in class file %s",
270 index, CHECK);
271 char* str = java_lang_String::as_utf8_string(patch());
272 // (could use java_lang_String::as_symbol instead, but might as well batch them)
273 utf8_buffer = (u1*) str;
274 utf8_length = (int) strlen(str);
275 }
276
277 unsigned int hash;
278 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
279 if (result == NULL) {
280 names[names_count] = (char*)utf8_buffer;
281 lengths[names_count] = utf8_length;
282 indices[names_count] = index;
283 hashValues[names_count++] = hash;
284 if (names_count == SymbolTable::symbol_alloc_batch_size) {
285 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
286 names_count = 0;
287 }
288 } else {
289 _cp->symbol_at_put(index, result);
290 }
291 }
292 break;
293 default:
294 classfile_parse_error(
295 "Unknown constant tag %u in class file %s", tag, CHECK);
296 break;
297 }
298 }
299
300 // Allocate the remaining symbols
301 if (names_count > 0) {
302 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
303 }
304
305 // Copy _current pointer of local copy back to stream().
306 #ifdef ASSERT
307 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
308 #endif
309 cfs0->set_current(cfs1.current());
310 }
311
312 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
313
314 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
315 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
316 return cp->symbol_at(index);
317 else
318 return NULL;
319 }
320
321 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
324
325 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
326 u2 length = cfs->get_u2_fast();
327 guarantee_property(
328 length >= 1, "Illegal constant pool size %u in class file %s",
329 length, CHECK_(nullHandle));
330 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
331 CHECK_(nullHandle));
332 _cp = constant_pool; // save in case of errors
333 constantPoolHandle cp (THREAD, constant_pool);
334
335 // parsing constant pool entries
336 parse_constant_pool_entries(length, CHECK_(nullHandle));
337
338 int index = 1; // declared outside of loops for portability
339
340 // first verification pass - validate cross references and fixup class and string constants
341 for (index = 1; index < length; index++) { // Index 0 is unused
342 jbyte tag = cp->tag_at(index).value();
343 switch (tag) {
344 case JVM_CONSTANT_Class :
345 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
346 break;
347 case JVM_CONSTANT_Fieldref :
348 // fall through
349 case JVM_CONSTANT_Methodref :
350 // fall through
351 case JVM_CONSTANT_InterfaceMethodref : {
352 if (!_need_verify) break;
353 int klass_ref_index = cp->klass_ref_index_at(index);
354 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
355 check_property(valid_klass_reference_at(klass_ref_index),
356 "Invalid constant pool index %u in class file %s",
357 klass_ref_index,
358 CHECK_(nullHandle));
359 check_property(valid_cp_range(name_and_type_ref_index, length) &&
360 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
361 "Invalid constant pool index %u in class file %s",
362 name_and_type_ref_index,
363 CHECK_(nullHandle));
364 break;
365 }
366 case JVM_CONSTANT_String :
367 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
368 break;
369 case JVM_CONSTANT_Integer :
370 break;
371 case JVM_CONSTANT_Float :
372 break;
373 case JVM_CONSTANT_Long :
374 case JVM_CONSTANT_Double :
375 index++;
376 check_property(
377 (index < length && cp->tag_at(index).is_invalid()),
378 "Improper constant pool long/double index %u in class file %s",
379 index, CHECK_(nullHandle));
380 break;
381 case JVM_CONSTANT_NameAndType : {
382 if (!_need_verify) break;
383 int name_ref_index = cp->name_ref_index_at(index);
384 int signature_ref_index = cp->signature_ref_index_at(index);
385 check_property(valid_symbol_at(name_ref_index),
386 "Invalid constant pool index %u in class file %s",
387 name_ref_index, CHECK_(nullHandle));
388 check_property(valid_symbol_at(signature_ref_index),
389 "Invalid constant pool index %u in class file %s",
390 signature_ref_index, CHECK_(nullHandle));
391 break;
392 }
393 case JVM_CONSTANT_Utf8 :
394 break;
395 case JVM_CONSTANT_UnresolvedClass : // fall-through
396 case JVM_CONSTANT_UnresolvedClassInError:
397 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
398 break;
399 case JVM_CONSTANT_ClassIndex :
400 {
401 int class_index = cp->klass_index_at(index);
402 check_property(valid_symbol_at(class_index),
403 "Invalid constant pool index %u in class file %s",
404 class_index, CHECK_(nullHandle));
405 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
406 }
407 break;
408 case JVM_CONSTANT_StringIndex :
409 {
410 int string_index = cp->string_index_at(index);
411 check_property(valid_symbol_at(string_index),
412 "Invalid constant pool index %u in class file %s",
413 string_index, CHECK_(nullHandle));
414 Symbol* sym = cp->symbol_at(string_index);
415 cp->unresolved_string_at_put(index, sym);
416 }
417 break;
418 case JVM_CONSTANT_MethodHandle :
419 {
420 int ref_index = cp->method_handle_index_at(index);
421 check_property(
422 valid_cp_range(ref_index, length) &&
423 EnableInvokeDynamic,
424 "Invalid constant pool index %u in class file %s",
425 ref_index, CHECK_(nullHandle));
426 constantTag tag = cp->tag_at(ref_index);
427 int ref_kind = cp->method_handle_ref_kind_at(index);
428 switch (ref_kind) {
429 case JVM_REF_getField:
430 case JVM_REF_getStatic:
431 case JVM_REF_putField:
432 case JVM_REF_putStatic:
433 check_property(
434 tag.is_field(),
435 "Invalid constant pool index %u in class file %s (not a field)",
436 ref_index, CHECK_(nullHandle));
437 break;
438 case JVM_REF_invokeVirtual:
439 case JVM_REF_invokeStatic:
440 case JVM_REF_invokeSpecial:
441 case JVM_REF_newInvokeSpecial:
442 check_property(
443 tag.is_method(),
444 "Invalid constant pool index %u in class file %s (not a method)",
445 ref_index, CHECK_(nullHandle));
446 break;
447 case JVM_REF_invokeInterface:
448 check_property(
449 tag.is_interface_method(),
450 "Invalid constant pool index %u in class file %s (not an interface method)",
451 ref_index, CHECK_(nullHandle));
452 break;
453 default:
454 classfile_parse_error(
455 "Bad method handle kind at constant pool index %u in class file %s",
456 index, CHECK_(nullHandle));
457 }
458 // Keep the ref_index unchanged. It will be indirected at link-time.
459 }
460 break;
461 case JVM_CONSTANT_MethodType :
462 {
463 int ref_index = cp->method_type_index_at(index);
464 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
465 "Invalid constant pool index %u in class file %s",
466 ref_index, CHECK_(nullHandle));
467 }
468 break;
469 case JVM_CONSTANT_InvokeDynamic :
470 {
471 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
472 check_property(valid_cp_range(name_and_type_ref_index, length) &&
473 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
474 "Invalid constant pool index %u in class file %s",
475 name_and_type_ref_index,
476 CHECK_(nullHandle));
477 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
478 break;
479 }
480 default:
481 fatal(err_msg("bad constant pool tag value %u",
482 cp->tag_at(index).value()));
483 ShouldNotReachHere();
484 break;
485 } // end of switch
486 } // end of for
487
488 if (_cp_patches != NULL) {
489 // need to treat this_class specially...
490 assert(EnableInvokeDynamic, "");
491 int this_class_index;
492 {
493 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
494 u1* mark = cfs->current();
495 u2 flags = cfs->get_u2_fast();
496 this_class_index = cfs->get_u2_fast();
497 cfs->set_current(mark); // revert to mark
498 }
499
500 for (index = 1; index < length; index++) { // Index 0 is unused
501 if (has_cp_patch_at(index)) {
502 guarantee_property(index != this_class_index,
503 "Illegal constant pool patch to self at %d in class file %s",
504 index, CHECK_(nullHandle));
505 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
506 }
507 }
508 }
509
510 if (!_need_verify) {
511 return cp;
512 }
513
514 // second verification pass - checks the strings are of the right format.
515 // but not yet to the other entries
516 for (index = 1; index < length; index++) {
517 jbyte tag = cp->tag_at(index).value();
518 switch (tag) {
519 case JVM_CONSTANT_UnresolvedClass: {
520 Symbol* class_name = cp->unresolved_klass_at(index);
521 // check the name, even if _cp_patches will overwrite it
522 verify_legal_class_name(class_name, CHECK_(nullHandle));
523 break;
524 }
525 case JVM_CONSTANT_NameAndType: {
526 if (_need_verify && _major_version >= JAVA_7_VERSION) {
527 int sig_index = cp->signature_ref_index_at(index);
528 int name_index = cp->name_ref_index_at(index);
529 Symbol* name = cp->symbol_at(name_index);
530 Symbol* sig = cp->symbol_at(sig_index);
531 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
532 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
533 } else {
534 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
535 }
536 }
537 break;
538 }
539 case JVM_CONSTANT_InvokeDynamic:
540 case JVM_CONSTANT_Fieldref:
541 case JVM_CONSTANT_Methodref:
542 case JVM_CONSTANT_InterfaceMethodref: {
543 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
544 // already verified to be utf8
545 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
546 // already verified to be utf8
547 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
548 Symbol* name = cp->symbol_at(name_ref_index);
549 Symbol* signature = cp->symbol_at(signature_ref_index);
550 if (tag == JVM_CONSTANT_Fieldref) {
551 verify_legal_field_name(name, CHECK_(nullHandle));
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 // Signature is verified above, when iterating NameAndType_info.
554 // Need only to be sure it's the right type.
555 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
556 throwIllegalSignature(
557 "Field", name, signature, CHECK_(nullHandle));
558 }
559 } else {
560 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
561 }
562 } else {
563 verify_legal_method_name(name, CHECK_(nullHandle));
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 // Signature is verified above, when iterating NameAndType_info.
566 // Need only to be sure it's the right type.
567 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
568 throwIllegalSignature(
569 "Method", name, signature, CHECK_(nullHandle));
570 }
571 } else {
572 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
573 }
574 if (tag == JVM_CONSTANT_Methodref) {
575 // 4509014: If a class method name begins with '<', it must be "<init>".
576 assert(name != NULL, "method name in constant pool is null");
577 unsigned int name_len = name->utf8_length();
578 assert(name_len > 0, "bad method name"); // already verified as legal name
579 if (name->byte_at(0) == '<') {
580 if (name != vmSymbols::object_initializer_name()) {
581 classfile_parse_error(
582 "Bad method name at constant pool index %u in class file %s",
583 name_ref_index, CHECK_(nullHandle));
584 }
585 }
586 }
587 }
588 break;
589 }
590 case JVM_CONSTANT_MethodHandle: {
591 int ref_index = cp->method_handle_index_at(index);
592 int ref_kind = cp->method_handle_ref_kind_at(index);
593 switch (ref_kind) {
594 case JVM_REF_invokeVirtual:
595 case JVM_REF_invokeStatic:
596 case JVM_REF_invokeSpecial:
597 case JVM_REF_newInvokeSpecial:
598 {
599 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
600 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
601 Symbol* name = cp->symbol_at(name_ref_index);
602 if (ref_kind == JVM_REF_newInvokeSpecial) {
603 if (name != vmSymbols::object_initializer_name()) {
604 classfile_parse_error(
605 "Bad constructor name at constant pool index %u in class file %s",
606 name_ref_index, CHECK_(nullHandle));
607 }
608 } else {
609 if (name == vmSymbols::object_initializer_name()) {
610 classfile_parse_error(
611 "Bad method name at constant pool index %u in class file %s",
612 name_ref_index, CHECK_(nullHandle));
613 }
614 }
615 }
616 break;
617 // Other ref_kinds are already fully checked in previous pass.
618 }
619 break;
620 }
621 case JVM_CONSTANT_MethodType: {
622 Symbol* no_name = vmSymbols::type_name(); // place holder
623 Symbol* signature = cp->method_type_signature_at(index);
624 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
625 break;
626 }
627 case JVM_CONSTANT_Utf8: {
628 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
629 }
630 } // end of switch
631 } // end of for
632
633 return cp;
634 }
635
636
637 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
638 assert(EnableInvokeDynamic, "");
639 BasicType patch_type = T_VOID;
640
641 switch (cp->tag_at(index).value()) {
642
643 case JVM_CONSTANT_UnresolvedClass :
644 // Patching a class means pre-resolving it.
645 // The name in the constant pool is ignored.
646 if (java_lang_Class::is_instance(patch())) {
647 guarantee_property(!java_lang_Class::is_primitive(patch()),
648 "Illegal class patch at %d in class file %s",
649 index, CHECK);
650 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
651 } else {
652 guarantee_property(java_lang_String::is_instance(patch()),
653 "Illegal class patch at %d in class file %s",
654 index, CHECK);
655 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
656 cp->unresolved_klass_at_put(index, name);
657 }
658 break;
659
660 case JVM_CONSTANT_String :
661 // skip this patch and don't clear it. Needs the oop array for resolved
662 // references to be created first.
663 return;
664
665 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
666 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
667 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
668 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
669 patch_prim:
670 {
671 jvalue value;
672 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
673 guarantee_property(value_type == patch_type,
674 "Illegal primitive patch at %d in class file %s",
675 index, CHECK);
676 switch (value_type) {
677 case T_INT: cp->int_at_put(index, value.i); break;
678 case T_FLOAT: cp->float_at_put(index, value.f); break;
679 case T_LONG: cp->long_at_put(index, value.j); break;
680 case T_DOUBLE: cp->double_at_put(index, value.d); break;
681 default: assert(false, "");
682 }
683 }
684 break;
685
686 default:
687 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
688 guarantee_property(!has_cp_patch_at(index),
689 "Illegal unexpected patch at %d in class file %s",
690 index, CHECK);
691 return;
692 }
693
694 // On fall-through, mark the patch as used.
695 clear_cp_patch_at(index);
696 }
697
698
699
700 class NameSigHash: public ResourceObj {
701 public:
702 Symbol* _name; // name
703 Symbol* _sig; // signature
704 NameSigHash* _next; // Next entry in hash table
705 };
706
707
708 #define HASH_ROW_SIZE 256
709
710 unsigned int hash(Symbol* name, Symbol* sig) {
711 unsigned int raw_hash = 0;
712 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
713 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
714
715 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
716 }
717
718
719 void initialize_hashtable(NameSigHash** table) {
720 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
721 }
722
723 // Return false if the name/sig combination is found in table.
724 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
725 // The old format checker uses heap sort to find duplicates.
726 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
727 // of table since we don't expect Symbol*'s to move.
728 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
729 assert(name != NULL, "name in constant pool is NULL");
730
731 // First lookup for duplicates
732 int index = hash(name, sig);
733 NameSigHash* entry = table[index];
734 while (entry != NULL) {
735 if (entry->_name == name && entry->_sig == sig) {
736 return false;
737 }
738 entry = entry->_next;
739 }
740
741 // No duplicate is found, allocate a new entry and fill it.
742 entry = new NameSigHash();
743 entry->_name = name;
744 entry->_sig = sig;
745
746 // Insert into hash table
747 entry->_next = table[index];
748 table[index] = entry;
749
750 return true;
751 }
752
753
754 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
755 Handle protection_domain,
756 Symbol* class_name,
757 bool* has_default_methods,
758 TRAPS) {
759 if (length == 0) {
760 _local_interfaces = Universe::the_empty_klass_array();
761 } else {
762 ClassFileStream* cfs = stream();
763 assert(length > 0, "only called for length>0");
764 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
765
766 int index;
767 for (index = 0; index < length; index++) {
768 u2 interface_index = cfs->get_u2(CHECK_NULL);
769 KlassHandle interf;
770 check_property(
771 valid_klass_reference_at(interface_index),
772 "Interface name has bad constant pool index %u in class file %s",
773 interface_index, CHECK_NULL);
774 if (_cp->tag_at(interface_index).is_klass()) {
775 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
776 } else {
777 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
778
779 // Don't need to check legal name because it's checked when parsing constant pool.
780 // But need to make sure it's not an array type.
781 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
782 "Bad interface name in class file %s", CHECK_NULL);
783 Handle class_loader(THREAD, _loader_data->class_loader());
784
785 // Call resolve_super so classcircularity is checked
786 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
787 unresolved_klass, class_loader, protection_domain,
788 false, CHECK_NULL);
789 interf = KlassHandle(THREAD, k);
790 }
791
792 if (!interf()->is_interface()) {
793 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
794 }
795 if (InstanceKlass::cast(interf())->has_default_methods()) {
796 *has_default_methods = true;
797 }
798 _local_interfaces->at_put(index, interf());
799 }
800
801 if (!_need_verify || length <= 1) {
802 return _local_interfaces;
803 }
804
805 // Check if there's any duplicates in interfaces
806 ResourceMark rm(THREAD);
807 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
808 THREAD, NameSigHash*, HASH_ROW_SIZE);
809 initialize_hashtable(interface_names);
810 bool dup = false;
811 {
812 debug_only(No_Safepoint_Verifier nsv;)
813 for (index = 0; index < length; index++) {
814 Klass* k = _local_interfaces->at(index);
815 Symbol* name = InstanceKlass::cast(k)->name();
816 // If no duplicates, add (name, NULL) in hashtable interface_names.
817 if (!put_after_lookup(name, NULL, interface_names)) {
818 dup = true;
819 break;
820 }
821 }
822 }
823 if (dup) {
824 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
825 }
826 }
827 return _local_interfaces;
828 }
829
830
831 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
832 // Make sure the constant pool entry is of a type appropriate to this field
833 guarantee_property(
834 (constantvalue_index > 0 &&
835 constantvalue_index < _cp->length()),
836 "Bad initial value index %u in ConstantValue attribute in class file %s",
837 constantvalue_index, CHECK);
838 constantTag value_type = _cp->tag_at(constantvalue_index);
839 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
840 case T_LONG:
841 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
842 break;
843 case T_FLOAT:
844 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
845 break;
846 case T_DOUBLE:
847 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
848 break;
849 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
850 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
851 break;
852 case T_OBJECT:
853 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
854 && value_type.is_string()),
855 "Bad string initial value in class file %s", CHECK);
856 break;
857 default:
858 classfile_parse_error(
859 "Unable to set initial value %u in class file %s",
860 constantvalue_index, CHECK);
861 }
862 }
863
864
865 // Parse attributes for a field.
866 void ClassFileParser::parse_field_attributes(u2 attributes_count,
867 bool is_static, u2 signature_index,
868 u2* constantvalue_index_addr,
869 bool* is_synthetic_addr,
870 u2* generic_signature_index_addr,
871 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
872 TRAPS) {
873 ClassFileStream* cfs = stream();
874 assert(attributes_count > 0, "length should be greater than 0");
875 u2 constantvalue_index = 0;
876 u2 generic_signature_index = 0;
877 bool is_synthetic = false;
878 u1* runtime_visible_annotations = NULL;
879 int runtime_visible_annotations_length = 0;
880 u1* runtime_invisible_annotations = NULL;
881 int runtime_invisible_annotations_length = 0;
882 u1* runtime_visible_type_annotations = NULL;
883 int runtime_visible_type_annotations_length = 0;
884 u1* runtime_invisible_type_annotations = NULL;
885 int runtime_invisible_type_annotations_length = 0;
886 while (attributes_count--) {
887 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
888 u2 attribute_name_index = cfs->get_u2_fast();
889 u4 attribute_length = cfs->get_u4_fast();
890 check_property(valid_symbol_at(attribute_name_index),
891 "Invalid field attribute index %u in class file %s",
892 attribute_name_index,
893 CHECK);
894 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
895 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
896 // ignore if non-static
897 if (constantvalue_index != 0) {
898 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
899 }
900 check_property(
901 attribute_length == 2,
902 "Invalid ConstantValue field attribute length %u in class file %s",
903 attribute_length, CHECK);
904 constantvalue_index = cfs->get_u2(CHECK);
905 if (_need_verify) {
906 verify_constantvalue(constantvalue_index, signature_index, CHECK);
907 }
908 } else if (attribute_name == vmSymbols::tag_synthetic()) {
909 if (attribute_length != 0) {
910 classfile_parse_error(
911 "Invalid Synthetic field attribute length %u in class file %s",
912 attribute_length, CHECK);
913 }
914 is_synthetic = true;
915 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
916 if (attribute_length != 0) {
917 classfile_parse_error(
918 "Invalid Deprecated field attribute length %u in class file %s",
919 attribute_length, CHECK);
920 }
921 } else if (_major_version >= JAVA_1_5_VERSION) {
922 if (attribute_name == vmSymbols::tag_signature()) {
923 if (attribute_length != 2) {
924 classfile_parse_error(
925 "Wrong size %u for field's Signature attribute in class file %s",
926 attribute_length, CHECK);
927 }
928 generic_signature_index = cfs->get_u2(CHECK);
929 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
930 runtime_visible_annotations_length = attribute_length;
931 runtime_visible_annotations = cfs->get_u1_buffer();
932 assert(runtime_visible_annotations != NULL, "null visible annotations");
933 parse_annotations(runtime_visible_annotations,
934 runtime_visible_annotations_length,
935 parsed_annotations,
936 CHECK);
937 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
938 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
939 runtime_invisible_annotations_length = attribute_length;
940 runtime_invisible_annotations = cfs->get_u1_buffer();
941 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
942 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
943 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
944 runtime_visible_type_annotations_length = attribute_length;
945 runtime_visible_type_annotations = cfs->get_u1_buffer();
946 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
947 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
948 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
949 runtime_invisible_type_annotations_length = attribute_length;
950 runtime_invisible_type_annotations = cfs->get_u1_buffer();
951 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
952 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
953 } else {
954 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
955 }
956 } else {
957 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
958 }
959 }
960
961 *constantvalue_index_addr = constantvalue_index;
962 *is_synthetic_addr = is_synthetic;
963 *generic_signature_index_addr = generic_signature_index;
964 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
965 runtime_visible_annotations_length,
966 runtime_invisible_annotations,
967 runtime_invisible_annotations_length,
968 CHECK);
969 parsed_annotations->set_field_annotations(a);
970 a = assemble_annotations(runtime_visible_type_annotations,
971 runtime_visible_type_annotations_length,
972 runtime_invisible_type_annotations,
973 runtime_invisible_type_annotations_length,
974 CHECK);
975 parsed_annotations->set_field_type_annotations(a);
976 return;
977 }
978
979
980 // Field allocation types. Used for computing field offsets.
981
982 enum FieldAllocationType {
983 STATIC_OOP, // Oops
984 STATIC_BYTE, // Boolean, Byte, char
985 STATIC_SHORT, // shorts
986 STATIC_WORD, // ints
987 STATIC_DOUBLE, // aligned long or double
988 NONSTATIC_OOP,
989 NONSTATIC_BYTE,
990 NONSTATIC_SHORT,
991 NONSTATIC_WORD,
992 NONSTATIC_DOUBLE,
993 MAX_FIELD_ALLOCATION_TYPE,
994 BAD_ALLOCATION_TYPE = -1
995 };
996
997 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
998 BAD_ALLOCATION_TYPE, // 0
999 BAD_ALLOCATION_TYPE, // 1
1000 BAD_ALLOCATION_TYPE, // 2
1001 BAD_ALLOCATION_TYPE, // 3
1002 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1003 NONSTATIC_SHORT, // T_CHAR = 5,
1004 NONSTATIC_WORD, // T_FLOAT = 6,
1005 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1006 NONSTATIC_BYTE, // T_BYTE = 8,
1007 NONSTATIC_SHORT, // T_SHORT = 9,
1008 NONSTATIC_WORD, // T_INT = 10,
1009 NONSTATIC_DOUBLE, // T_LONG = 11,
1010 NONSTATIC_OOP, // T_OBJECT = 12,
1011 NONSTATIC_OOP, // T_ARRAY = 13,
1012 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1013 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1014 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1015 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1016 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1017 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1018 BAD_ALLOCATION_TYPE, // 0
1019 BAD_ALLOCATION_TYPE, // 1
1020 BAD_ALLOCATION_TYPE, // 2
1021 BAD_ALLOCATION_TYPE, // 3
1022 STATIC_BYTE , // T_BOOLEAN = 4,
1023 STATIC_SHORT, // T_CHAR = 5,
1024 STATIC_WORD, // T_FLOAT = 6,
1025 STATIC_DOUBLE, // T_DOUBLE = 7,
1026 STATIC_BYTE, // T_BYTE = 8,
1027 STATIC_SHORT, // T_SHORT = 9,
1028 STATIC_WORD, // T_INT = 10,
1029 STATIC_DOUBLE, // T_LONG = 11,
1030 STATIC_OOP, // T_OBJECT = 12,
1031 STATIC_OOP, // T_ARRAY = 13,
1032 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1033 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1034 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1035 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1036 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1037 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1038 };
1039
1040 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1041 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1042 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1043 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1044 return result;
1045 }
1046
1047 class FieldAllocationCount: public ResourceObj {
1048 public:
1049 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1050
1051 FieldAllocationCount() {
1052 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1053 count[i] = 0;
1054 }
1055 }
1056
1057 FieldAllocationType update(bool is_static, BasicType type) {
1058 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1059 // Make sure there is no overflow with injected fields.
1060 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1061 count[atype]++;
1062 return atype;
1063 }
1064 };
1065
1066 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1067 bool is_interface,
1068 FieldAllocationCount *fac,
1069 u2* java_fields_count_ptr, TRAPS) {
1070 ClassFileStream* cfs = stream();
1071 cfs->guarantee_more(2, CHECK_NULL); // length
1072 u2 length = cfs->get_u2_fast();
1073 *java_fields_count_ptr = length;
1074
1075 int num_injected = 0;
1076 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1077 int total_fields = length + num_injected;
1078
1079 // The field array starts with tuples of shorts
1080 // [access, name index, sig index, initial value index, byte offset].
1081 // A generic signature slot only exists for field with generic
1082 // signature attribute. And the access flag is set with
1083 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1084 // signature slots are at the end of the field array and after all
1085 // other fields data.
1086 //
1087 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1088 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1089 // ...
1090 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1091 // [generic signature index]
1092 // [generic signature index]
1093 // ...
1094 //
1095 // Allocate a temporary resource array for field data. For each field,
1096 // a slot is reserved in the temporary array for the generic signature
1097 // index. After parsing all fields, the data are copied to a permanent
1098 // array and any unused slots will be discarded.
1099 ResourceMark rm(THREAD);
1100 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1101 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1102
1103 // The generic signature slots start after all other fields' data.
1104 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1105 int num_generic_signature = 0;
1106 for (int n = 0; n < length; n++) {
1107 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1108
1109 AccessFlags access_flags;
1110 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1111 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1112 access_flags.set_flags(flags);
1113
1114 u2 name_index = cfs->get_u2_fast();
1115 int cp_size = _cp->length();
1116 check_property(valid_symbol_at(name_index),
1117 "Invalid constant pool index %u for field name in class file %s",
1118 name_index,
1119 CHECK_NULL);
1120 Symbol* name = _cp->symbol_at(name_index);
1121 verify_legal_field_name(name, CHECK_NULL);
1122
1123 u2 signature_index = cfs->get_u2_fast();
1124 check_property(valid_symbol_at(signature_index),
1125 "Invalid constant pool index %u for field signature in class file %s",
1126 signature_index, CHECK_NULL);
1127 Symbol* sig = _cp->symbol_at(signature_index);
1128 verify_legal_field_signature(name, sig, CHECK_NULL);
1129
1130 u2 constantvalue_index = 0;
1131 bool is_synthetic = false;
1132 u2 generic_signature_index = 0;
1133 bool is_static = access_flags.is_static();
1134 FieldAnnotationCollector parsed_annotations(_loader_data);
1135
1136 u2 attributes_count = cfs->get_u2_fast();
1137 if (attributes_count > 0) {
1138 parse_field_attributes(attributes_count, is_static, signature_index,
1139 &constantvalue_index, &is_synthetic,
1140 &generic_signature_index, &parsed_annotations,
1141 CHECK_NULL);
1142 if (parsed_annotations.field_annotations() != NULL) {
1143 if (_fields_annotations == NULL) {
1144 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1145 _loader_data, length, NULL,
1146 CHECK_NULL);
1147 }
1148 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1149 parsed_annotations.set_field_annotations(NULL);
1150 }
1151 if (parsed_annotations.field_type_annotations() != NULL) {
1152 if (_fields_type_annotations == NULL) {
1153 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1154 _loader_data, length, NULL,
1155 CHECK_NULL);
1156 }
1157 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1158 parsed_annotations.set_field_type_annotations(NULL);
1159 }
1160
1161 if (is_synthetic) {
1162 access_flags.set_is_synthetic();
1163 }
1164 if (generic_signature_index != 0) {
1165 access_flags.set_field_has_generic_signature();
1166 fa[generic_signature_slot] = generic_signature_index;
1167 generic_signature_slot ++;
1168 num_generic_signature ++;
1169 }
1170 }
1171
1172 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1173 field->initialize(access_flags.as_short(),
1174 name_index,
1175 signature_index,
1176 constantvalue_index);
1177 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1178
1179 // Remember how many oops we encountered and compute allocation type
1180 FieldAllocationType atype = fac->update(is_static, type);
1181 field->set_allocation_type(atype);
1182
1183 // After field is initialized with type, we can augment it with aux info
1184 if (parsed_annotations.has_any_annotations())
1185 parsed_annotations.apply_to(field);
1186 }
1187
1188 int index = length;
1189 if (num_injected != 0) {
1190 for (int n = 0; n < num_injected; n++) {
1191 // Check for duplicates
1192 if (injected[n].may_be_java) {
1193 Symbol* name = injected[n].name();
1194 Symbol* signature = injected[n].signature();
1195 bool duplicate = false;
1196 for (int i = 0; i < length; i++) {
1197 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1198 if (name == _cp->symbol_at(f->name_index()) &&
1199 signature == _cp->symbol_at(f->signature_index())) {
1200 // Symbol is desclared in Java so skip this one
1201 duplicate = true;
1202 break;
1203 }
1204 }
1205 if (duplicate) {
1206 // These will be removed from the field array at the end
1207 continue;
1208 }
1209 }
1210
1211 // Injected field
1212 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1213 field->initialize(JVM_ACC_FIELD_INTERNAL,
1214 injected[n].name_index,
1215 injected[n].signature_index,
1216 0);
1217
1218 BasicType type = FieldType::basic_type(injected[n].signature());
1219
1220 // Remember how many oops we encountered and compute allocation type
1221 FieldAllocationType atype = fac->update(false, type);
1222 field->set_allocation_type(atype);
1223 index++;
1224 }
1225 }
1226
1227 // Now copy the fields' data from the temporary resource array.
1228 // Sometimes injected fields already exist in the Java source so
1229 // the fields array could be too long. In that case the
1230 // fields array is trimed. Also unused slots that were reserved
1231 // for generic signature indexes are discarded.
1232 Array<u2>* fields = MetadataFactory::new_array<u2>(
1233 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1234 CHECK_NULL);
1235 _fields = fields; // save in case of error
1236 {
1237 int i = 0;
1238 for (; i < index * FieldInfo::field_slots; i++) {
1239 fields->at_put(i, fa[i]);
1240 }
1241 for (int j = total_fields * FieldInfo::field_slots;
1242 j < generic_signature_slot; j++) {
1243 fields->at_put(i++, fa[j]);
1244 }
1245 assert(i == fields->length(), "");
1246 }
1247
1248 if (_need_verify && length > 1) {
1249 // Check duplicated fields
1250 ResourceMark rm(THREAD);
1251 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1252 THREAD, NameSigHash*, HASH_ROW_SIZE);
1253 initialize_hashtable(names_and_sigs);
1254 bool dup = false;
1255 {
1256 debug_only(No_Safepoint_Verifier nsv;)
1257 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1258 Symbol* name = fs.name();
1259 Symbol* sig = fs.signature();
1260 // If no duplicates, add name/signature in hashtable names_and_sigs.
1261 if (!put_after_lookup(name, sig, names_and_sigs)) {
1262 dup = true;
1263 break;
1264 }
1265 }
1266 }
1267 if (dup) {
1268 classfile_parse_error("Duplicate field name&signature in class file %s",
1269 CHECK_NULL);
1270 }
1271 }
1272
1273 return fields;
1274 }
1275
1276
1277 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1278 while (length-- > 0) {
1279 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1280 }
1281 }
1282
1283
1284 u2* ClassFileParser::parse_exception_table(u4 code_length,
1285 u4 exception_table_length,
1286 TRAPS) {
1287 ClassFileStream* cfs = stream();
1288
1289 u2* exception_table_start = cfs->get_u2_buffer();
1290 assert(exception_table_start != NULL, "null exception table");
1291 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1292 // Will check legal target after parsing code array in verifier.
1293 if (_need_verify) {
1294 for (unsigned int i = 0; i < exception_table_length; i++) {
1295 u2 start_pc = cfs->get_u2_fast();
1296 u2 end_pc = cfs->get_u2_fast();
1297 u2 handler_pc = cfs->get_u2_fast();
1298 u2 catch_type_index = cfs->get_u2_fast();
1299 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1300 "Illegal exception table range in class file %s",
1301 CHECK_NULL);
1302 guarantee_property(handler_pc < code_length,
1303 "Illegal exception table handler in class file %s",
1304 CHECK_NULL);
1305 if (catch_type_index != 0) {
1306 guarantee_property(valid_klass_reference_at(catch_type_index),
1307 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1308 }
1309 }
1310 } else {
1311 cfs->skip_u2_fast(exception_table_length * 4);
1312 }
1313 return exception_table_start;
1314 }
1315
1316 void ClassFileParser::parse_linenumber_table(
1317 u4 code_attribute_length, u4 code_length,
1318 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1319 ClassFileStream* cfs = stream();
1320 unsigned int num_entries = cfs->get_u2(CHECK);
1321
1322 // Each entry is a u2 start_pc, and a u2 line_number
1323 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1324
1325 // Verify line number attribute and table length
1326 check_property(
1327 code_attribute_length == sizeof(u2) + length_in_bytes,
1328 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1329
1330 cfs->guarantee_more(length_in_bytes, CHECK);
1331
1332 if ((*write_stream) == NULL) {
1333 if (length_in_bytes > fixed_buffer_size) {
1334 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1335 } else {
1336 (*write_stream) = new CompressedLineNumberWriteStream(
1337 linenumbertable_buffer, fixed_buffer_size);
1338 }
1339 }
1340
1341 while (num_entries-- > 0) {
1342 u2 bci = cfs->get_u2_fast(); // start_pc
1343 u2 line = cfs->get_u2_fast(); // line_number
1344 guarantee_property(bci < code_length,
1345 "Invalid pc in LineNumberTable in class file %s", CHECK);
1346 (*write_stream)->write_pair(bci, line);
1347 }
1348 }
1349
1350
1351 // Class file LocalVariableTable elements.
1352 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1353 public:
1354 u2 start_bci;
1355 u2 length;
1356 u2 name_cp_index;
1357 u2 descriptor_cp_index;
1358 u2 slot;
1359 };
1360
1361
1362 class LVT_Hash: public CHeapObj<mtClass> {
1363 public:
1364 LocalVariableTableElement *_elem; // element
1365 LVT_Hash* _next; // Next entry in hash table
1366 };
1367
1368 unsigned int hash(LocalVariableTableElement *elem) {
1369 unsigned int raw_hash = elem->start_bci;
1370
1371 raw_hash = elem->length + raw_hash * 37;
1372 raw_hash = elem->name_cp_index + raw_hash * 37;
1373 raw_hash = elem->slot + raw_hash * 37;
1374
1375 return raw_hash % HASH_ROW_SIZE;
1376 }
1377
1378 void initialize_hashtable(LVT_Hash** table) {
1379 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1380 table[i] = NULL;
1381 }
1382 }
1383
1384 void clear_hashtable(LVT_Hash** table) {
1385 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1386 LVT_Hash* current = table[i];
1387 LVT_Hash* next;
1388 while (current != NULL) {
1389 next = current->_next;
1390 current->_next = NULL;
1391 delete(current);
1392 current = next;
1393 }
1394 table[i] = NULL;
1395 }
1396 }
1397
1398 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1399 LVT_Hash* entry = table[index];
1400
1401 /*
1402 * 3-tuple start_bci/length/slot has to be unique key,
1403 * so the following comparison seems to be redundant:
1404 * && elem->name_cp_index == entry->_elem->name_cp_index
1405 */
1406 while (entry != NULL) {
1407 if (elem->start_bci == entry->_elem->start_bci
1408 && elem->length == entry->_elem->length
1409 && elem->name_cp_index == entry->_elem->name_cp_index
1410 && elem->slot == entry->_elem->slot
1411 ) {
1412 return entry;
1413 }
1414 entry = entry->_next;
1415 }
1416 return NULL;
1417 }
1418
1419 // Return false if the local variable is found in table.
1420 // Return true if no duplicate is found.
1421 // And local variable is added as a new entry in table.
1422 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1423 // First lookup for duplicates
1424 int index = hash(elem);
1425 LVT_Hash* entry = LVT_lookup(elem, index, table);
1426
1427 if (entry != NULL) {
1428 return false;
1429 }
1430 // No duplicate is found, allocate a new entry and fill it.
1431 if ((entry = new LVT_Hash()) == NULL) {
1432 return false;
1433 }
1434 entry->_elem = elem;
1435
1436 // Insert into hash table
1437 entry->_next = table[index];
1438 table[index] = entry;
1439
1440 return true;
1441 }
1442
1443 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1444 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1445 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1446 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1447 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1448 lvt->signature_cp_index = 0;
1449 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1450 }
1451
1452 // Function is used to parse both attributes:
1453 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1454 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1455 u2 max_locals,
1456 u4 code_attribute_length,
1457 u2* localvariable_table_length,
1458 bool isLVTT,
1459 TRAPS) {
1460 ClassFileStream* cfs = stream();
1461 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1462 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1463 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1464 // Verify local variable table attribute has right length
1465 if (_need_verify) {
1466 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1467 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1468 }
1469 u2* localvariable_table_start = cfs->get_u2_buffer();
1470 assert(localvariable_table_start != NULL, "null local variable table");
1471 if (!_need_verify) {
1472 cfs->skip_u2_fast(size);
1473 } else {
1474 cfs->guarantee_more(size * 2, CHECK_NULL);
1475 for(int i = 0; i < (*localvariable_table_length); i++) {
1476 u2 start_pc = cfs->get_u2_fast();
1477 u2 length = cfs->get_u2_fast();
1478 u2 name_index = cfs->get_u2_fast();
1479 u2 descriptor_index = cfs->get_u2_fast();
1480 u2 index = cfs->get_u2_fast();
1481 // Assign to a u4 to avoid overflow
1482 u4 end_pc = (u4)start_pc + (u4)length;
1483
1484 if (start_pc >= code_length) {
1485 classfile_parse_error(
1486 "Invalid start_pc %u in %s in class file %s",
1487 start_pc, tbl_name, CHECK_NULL);
1488 }
1489 if (end_pc > code_length) {
1490 classfile_parse_error(
1491 "Invalid length %u in %s in class file %s",
1492 length, tbl_name, CHECK_NULL);
1493 }
1494 int cp_size = _cp->length();
1495 guarantee_property(valid_symbol_at(name_index),
1496 "Name index %u in %s has bad constant type in class file %s",
1497 name_index, tbl_name, CHECK_NULL);
1498 guarantee_property(valid_symbol_at(descriptor_index),
1499 "Signature index %u in %s has bad constant type in class file %s",
1500 descriptor_index, tbl_name, CHECK_NULL);
1501
1502 Symbol* name = _cp->symbol_at(name_index);
1503 Symbol* sig = _cp->symbol_at(descriptor_index);
1504 verify_legal_field_name(name, CHECK_NULL);
1505 u2 extra_slot = 0;
1506 if (!isLVTT) {
1507 verify_legal_field_signature(name, sig, CHECK_NULL);
1508
1509 // 4894874: check special cases for double and long local variables
1510 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1511 sig == vmSymbols::type_signature(T_LONG)) {
1512 extra_slot = 1;
1513 }
1514 }
1515 guarantee_property((index + extra_slot) < max_locals,
1516 "Invalid index %u in %s in class file %s",
1517 index, tbl_name, CHECK_NULL);
1518 }
1519 }
1520 return localvariable_table_start;
1521 }
1522
1523
1524 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1525 u1* u1_array, u2* u2_array, TRAPS) {
1526 ClassFileStream* cfs = stream();
1527 u2 index = 0; // index in the array with long/double occupying two slots
1528 u4 i1 = *u1_index;
1529 u4 i2 = *u2_index + 1;
1530 for(int i = 0; i < array_length; i++) {
1531 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1532 index++;
1533 if (tag == ITEM_Long || tag == ITEM_Double) {
1534 index++;
1535 } else if (tag == ITEM_Object) {
1536 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1537 guarantee_property(valid_klass_reference_at(class_index),
1538 "Bad class index %u in StackMap in class file %s",
1539 class_index, CHECK);
1540 } else if (tag == ITEM_Uninitialized) {
1541 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1542 guarantee_property(
1543 offset < code_length,
1544 "Bad uninitialized type offset %u in StackMap in class file %s",
1545 offset, CHECK);
1546 } else {
1547 guarantee_property(
1548 tag <= (u1)ITEM_Uninitialized,
1549 "Unknown variable type %u in StackMap in class file %s",
1550 tag, CHECK);
1551 }
1552 }
1553 u2_array[*u2_index] = index;
1554 *u1_index = i1;
1555 *u2_index = i2;
1556 }
1557
1558 u1* ClassFileParser::parse_stackmap_table(
1559 u4 code_attribute_length, TRAPS) {
1560 if (code_attribute_length == 0)
1561 return NULL;
1562
1563 ClassFileStream* cfs = stream();
1564 u1* stackmap_table_start = cfs->get_u1_buffer();
1565 assert(stackmap_table_start != NULL, "null stackmap table");
1566
1567 // check code_attribute_length first
1568 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1569
1570 if (!_need_verify && !DumpSharedSpaces) {
1571 return NULL;
1572 }
1573 return stackmap_table_start;
1574 }
1575
1576 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1577 u4 method_attribute_length,
1578 TRAPS) {
1579 ClassFileStream* cfs = stream();
1580 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1581 *checked_exceptions_length = cfs->get_u2_fast();
1582 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1583 u2* checked_exceptions_start = cfs->get_u2_buffer();
1584 assert(checked_exceptions_start != NULL, "null checked exceptions");
1585 if (!_need_verify) {
1586 cfs->skip_u2_fast(size);
1587 } else {
1588 // Verify each value in the checked exception table
1589 u2 checked_exception;
1590 u2 len = *checked_exceptions_length;
1591 cfs->guarantee_more(2 * len, CHECK_NULL);
1592 for (int i = 0; i < len; i++) {
1593 checked_exception = cfs->get_u2_fast();
1594 check_property(
1595 valid_klass_reference_at(checked_exception),
1596 "Exception name has bad type at constant pool %u in class file %s",
1597 checked_exception, CHECK_NULL);
1598 }
1599 }
1600 // check exceptions attribute length
1601 if (_need_verify) {
1602 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1603 sizeof(u2) * size),
1604 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1605 }
1606 return checked_exceptions_start;
1607 }
1608
1609 void ClassFileParser::throwIllegalSignature(
1610 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1611 ResourceMark rm(THREAD);
1612 Exceptions::fthrow(THREAD_AND_LOCATION,
1613 vmSymbols::java_lang_ClassFormatError(),
1614 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1615 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1616 }
1617
1618 // Skip an annotation. Return >=limit if there is any problem.
1619 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1620 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1621 // value := switch (tag:u1) { ... }
1622 index += 2; // skip atype
1623 if ((index += 2) >= limit) return limit; // read nmem
1624 int nmem = Bytes::get_Java_u2(buffer+index-2);
1625 while (--nmem >= 0 && index < limit) {
1626 index += 2; // skip member
1627 index = skip_annotation_value(buffer, limit, index);
1628 }
1629 return index;
1630 }
1631
1632 // Skip an annotation value. Return >=limit if there is any problem.
1633 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1634 // value := switch (tag:u1) {
1635 // case B, C, I, S, Z, D, F, J, c: con:u2;
1636 // case e: e_class:u2 e_name:u2;
1637 // case s: s_con:u2;
1638 // case [: do(nval:u2) {value};
1639 // case @: annotation;
1640 // case s: s_con:u2;
1641 // }
1642 if ((index += 1) >= limit) return limit; // read tag
1643 u1 tag = buffer[index-1];
1644 switch (tag) {
1645 case 'B': case 'C': case 'I': case 'S': case 'Z':
1646 case 'D': case 'F': case 'J': case 'c': case 's':
1647 index += 2; // skip con or s_con
1648 break;
1649 case 'e':
1650 index += 4; // skip e_class, e_name
1651 break;
1652 case '[':
1653 {
1654 if ((index += 2) >= limit) return limit; // read nval
1655 int nval = Bytes::get_Java_u2(buffer+index-2);
1656 while (--nval >= 0 && index < limit) {
1657 index = skip_annotation_value(buffer, limit, index);
1658 }
1659 }
1660 break;
1661 case '@':
1662 index = skip_annotation(buffer, limit, index);
1663 break;
1664 default:
1665 assert(false, "annotation tag");
1666 return limit; // bad tag byte
1667 }
1668 return index;
1669 }
1670
1671 // Sift through annotations, looking for those significant to the VM:
1672 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1673 ClassFileParser::AnnotationCollector* coll,
1674 TRAPS) {
1675 // annotations := do(nann:u2) {annotation}
1676 int index = 0;
1677 if ((index += 2) >= limit) return; // read nann
1678 int nann = Bytes::get_Java_u2(buffer+index-2);
1679 enum { // initial annotation layout
1680 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1681 count_off = 2, // u2 such as 1 (one value)
1682 member_off = 4, // utf8 such as 'value'
1683 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1684 e_tag_val = 'e',
1685 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1686 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1687 e_size = 11, // end of 'e' annotation
1688 c_tag_val = 'c', // payload is type
1689 c_con_off = 7, // utf8 payload, such as 'I'
1690 c_size = 9, // end of 'c' annotation
1691 s_tag_val = 's', // payload is String
1692 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1693 s_size = 9,
1694 min_size = 6 // smallest possible size (zero members)
1695 };
1696 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1697 int index0 = index;
1698 index = skip_annotation(buffer, limit, index);
1699 u1* abase = buffer + index0;
1700 int atype = Bytes::get_Java_u2(abase + atype_off);
1701 int count = Bytes::get_Java_u2(abase + count_off);
1702 Symbol* aname = check_symbol_at(_cp, atype);
1703 if (aname == NULL) break; // invalid annotation name
1704 Symbol* member = NULL;
1705 if (count >= 1) {
1706 int member_index = Bytes::get_Java_u2(abase + member_off);
1707 member = check_symbol_at(_cp, member_index);
1708 if (member == NULL) break; // invalid member name
1709 }
1710
1711 // Here is where parsing particular annotations will take place.
1712 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1713 if (id == AnnotationCollector::_unknown) continue;
1714 coll->set_annotation(id);
1715
1716 if (id == AnnotationCollector::_sun_misc_Contended) {
1717 if (count == 1
1718 && s_size == (index - index0) // match size
1719 && s_tag_val == *(abase + tag_off)
1720 && member == vmSymbols::value_name()) {
1721 u2 group_index = Bytes::get_Java_u2(abase + s_con_off);
1722 coll->set_contended_group(group_index);
1723 } else {
1724 coll->set_contended_group(0); // default contended group
1725 }
1726 coll->set_contended(true);
1727 } else {
1728 coll->set_contended(false);
1729 }
1730 }
1731 }
1732
1733 ClassFileParser::AnnotationCollector::ID
1734 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1735 Symbol* name) {
1736 vmSymbols::SID sid = vmSymbols::find_sid(name);
1737 // Privileged code can use all annotations. Other code silently drops some.
1738 bool privileged = loader_data->is_the_null_class_loader_data() ||
1739 loader_data->is_anonymous();
1740 switch (sid) {
1741 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1742 if (_location != _in_method) break; // only allow for methods
1743 if (!privileged) break; // only allow in privileged code
1744 return _method_ForceInline;
1745 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1746 if (_location != _in_method) break; // only allow for methods
1747 if (!privileged) break; // only allow in privileged code
1748 return _method_DontInline;
1749 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1750 if (_location != _in_method) break; // only allow for methods
1751 if (!privileged) break; // only allow in privileged code
1752 return _method_LambdaForm_Compiled;
1753 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1754 if (_location != _in_method) break; // only allow for methods
1755 if (!privileged) break; // only allow in privileged code
1756 return _method_LambdaForm_Hidden;
1757 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1758 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1759 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1760 return _sun_misc_Contended;
1761 default: break;
1762 }
1763 return AnnotationCollector::_unknown;
1764 }
1765
1766 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1767 if (is_contended())
1768 f->set_contended_group(contended_group());
1769 }
1770
1771 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1772 // If there's an error deallocate metadata for field annotations
1773 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1774 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1775 }
1776
1777 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1778 if (has_annotation(_method_ForceInline))
1779 m->set_force_inline(true);
1780 if (has_annotation(_method_DontInline))
1781 m->set_dont_inline(true);
1782 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1783 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1784 if (has_annotation(_method_LambdaForm_Hidden))
1785 m->set_hidden(true);
1786 }
1787
1788 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1789 k->set_is_contended(is_contended());
1790 }
1791
1792
1793 #define MAX_ARGS_SIZE 255
1794 #define MAX_CODE_SIZE 65535
1795 #define INITIAL_MAX_LVT_NUMBER 256
1796
1797 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1798 *
1799 * Rules for LVT's and LVTT's are:
1800 * - There can be any number of LVT's and LVTT's.
1801 * - If there are n LVT's, it is the same as if there was just
1802 * one LVT containing all the entries from the n LVT's.
1803 * - There may be no more than one LVT entry per local variable.
1804 * Two LVT entries are 'equal' if these fields are the same:
1805 * start_pc, length, name, slot
1806 * - There may be no more than one LVTT entry per each LVT entry.
1807 * Each LVTT entry has to match some LVT entry.
1808 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1809 */
1810 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1811 int lvt_cnt,
1812 u2* localvariable_table_length,
1813 u2** localvariable_table_start,
1814 int lvtt_cnt,
1815 u2* localvariable_type_table_length,
1816 u2** localvariable_type_table_start,
1817 TRAPS) {
1818
1819 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1820 initialize_hashtable(lvt_Hash);
1821
1822 // To fill LocalVariableTable in
1823 Classfile_LVT_Element* cf_lvt;
1824 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1825
1826 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1827 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1828 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1829 copy_lvt_element(&cf_lvt[idx], lvt);
1830 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1831 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1832 && _need_verify
1833 && _major_version >= JAVA_1_5_VERSION) {
1834 clear_hashtable(lvt_Hash);
1835 classfile_parse_error("Duplicated LocalVariableTable attribute "
1836 "entry for '%s' in class file %s",
1837 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1838 CHECK);
1839 }
1840 }
1841 }
1842
1843 // To merge LocalVariableTable and LocalVariableTypeTable
1844 Classfile_LVT_Element* cf_lvtt;
1845 LocalVariableTableElement lvtt_elem;
1846
1847 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1848 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1849 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1850 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1851 int index = hash(&lvtt_elem);
1852 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1853 if (entry == NULL) {
1854 if (_need_verify) {
1855 clear_hashtable(lvt_Hash);
1856 classfile_parse_error("LVTT entry for '%s' in class file %s "
1857 "does not match any LVT entry",
1858 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1859 CHECK);
1860 }
1861 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1862 clear_hashtable(lvt_Hash);
1863 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1864 "entry for '%s' in class file %s",
1865 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1866 CHECK);
1867 } else {
1868 // to add generic signatures into LocalVariableTable
1869 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1870 }
1871 }
1872 }
1873 clear_hashtable(lvt_Hash);
1874 }
1875
1876
1877 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1878 u1* runtime_visible_annotations,
1879 int runtime_visible_annotations_length,
1880 u1* runtime_invisible_annotations,
1881 int runtime_invisible_annotations_length,
1882 u1* runtime_visible_parameter_annotations,
1883 int runtime_visible_parameter_annotations_length,
1884 u1* runtime_invisible_parameter_annotations,
1885 int runtime_invisible_parameter_annotations_length,
1886 u1* runtime_visible_type_annotations,
1887 int runtime_visible_type_annotations_length,
1888 u1* runtime_invisible_type_annotations,
1889 int runtime_invisible_type_annotations_length,
1890 u1* annotation_default,
1891 int annotation_default_length,
1892 TRAPS) {
1893
1894 AnnotationArray* a;
1895
1896 if (runtime_visible_annotations_length +
1897 runtime_invisible_annotations_length > 0) {
1898 a = assemble_annotations(runtime_visible_annotations,
1899 runtime_visible_annotations_length,
1900 runtime_invisible_annotations,
1901 runtime_invisible_annotations_length,
1902 CHECK);
1903 cm->set_method_annotations(a);
1904 }
1905
1906 if (runtime_visible_parameter_annotations_length +
1907 runtime_invisible_parameter_annotations_length > 0) {
1908 a = assemble_annotations(runtime_visible_parameter_annotations,
1909 runtime_visible_parameter_annotations_length,
1910 runtime_invisible_parameter_annotations,
1911 runtime_invisible_parameter_annotations_length,
1912 CHECK);
1913 cm->set_parameter_annotations(a);
1914 }
1915
1916 if (annotation_default_length > 0) {
1917 a = assemble_annotations(annotation_default,
1918 annotation_default_length,
1919 NULL,
1920 0,
1921 CHECK);
1922 cm->set_default_annotations(a);
1923 }
1924
1925 if (runtime_visible_type_annotations_length +
1926 runtime_invisible_type_annotations_length > 0) {
1927 a = assemble_annotations(runtime_visible_type_annotations,
1928 runtime_visible_type_annotations_length,
1929 runtime_invisible_type_annotations,
1930 runtime_invisible_type_annotations_length,
1931 CHECK);
1932 cm->set_type_annotations(a);
1933 }
1934 }
1935
1936
1937 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1938 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1939 // Method* to save footprint, so we only know the size of the resulting Method* when the
1940 // entire method attribute is parsed.
1941 //
1942 // The promoted_flags parameter is used to pass relevant access_flags
1943 // from the method back up to the containing klass. These flag values
1944 // are added to klass's access_flags.
1945
1946 methodHandle ClassFileParser::parse_method(bool is_interface,
1947 AccessFlags *promoted_flags,
1948 TRAPS) {
1949 ClassFileStream* cfs = stream();
1950 methodHandle nullHandle;
1951 ResourceMark rm(THREAD);
1952 // Parse fixed parts
1953 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1954
1955 int flags = cfs->get_u2_fast();
1956 u2 name_index = cfs->get_u2_fast();
1957 int cp_size = _cp->length();
1958 check_property(
1959 valid_symbol_at(name_index),
1960 "Illegal constant pool index %u for method name in class file %s",
1961 name_index, CHECK_(nullHandle));
1962 Symbol* name = _cp->symbol_at(name_index);
1963 verify_legal_method_name(name, CHECK_(nullHandle));
1964
1965 u2 signature_index = cfs->get_u2_fast();
1966 guarantee_property(
1967 valid_symbol_at(signature_index),
1968 "Illegal constant pool index %u for method signature in class file %s",
1969 signature_index, CHECK_(nullHandle));
1970 Symbol* signature = _cp->symbol_at(signature_index);
1971
1972 AccessFlags access_flags;
1973 if (name == vmSymbols::class_initializer_name()) {
1974 // We ignore the other access flags for a valid class initializer.
1975 // (JVM Spec 2nd ed., chapter 4.6)
1976 if (_major_version < 51) { // backward compatibility
1977 flags = JVM_ACC_STATIC;
1978 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1979 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1980 }
1981 } else {
1982 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1983 }
1984
1985 int args_size = -1; // only used when _need_verify is true
1986 if (_need_verify) {
1987 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1988 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1989 if (args_size > MAX_ARGS_SIZE) {
1990 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1991 }
1992 }
1993
1994 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1995
1996 // Default values for code and exceptions attribute elements
1997 u2 max_stack = 0;
1998 u2 max_locals = 0;
1999 u4 code_length = 0;
2000 u1* code_start = 0;
2001 u2 exception_table_length = 0;
2002 u2* exception_table_start = NULL;
2003 Array<int>* exception_handlers = Universe::the_empty_int_array();
2004 u2 checked_exceptions_length = 0;
2005 u2* checked_exceptions_start = NULL;
2006 CompressedLineNumberWriteStream* linenumber_table = NULL;
2007 int linenumber_table_length = 0;
2008 int total_lvt_length = 0;
2009 u2 lvt_cnt = 0;
2010 u2 lvtt_cnt = 0;
2011 bool lvt_allocated = false;
2012 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2013 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2014 u2* localvariable_table_length;
2015 u2** localvariable_table_start;
2016 u2* localvariable_type_table_length;
2017 u2** localvariable_type_table_start;
2018 u2 method_parameters_length = 0;
2019 u1* method_parameters_data = NULL;
2020 bool method_parameters_seen = false;
2021 bool method_parameters_four_byte_flags;
2022 bool parsed_code_attribute = false;
2023 bool parsed_checked_exceptions_attribute = false;
2024 bool parsed_stackmap_attribute = false;
2025 // stackmap attribute - JDK1.5
2026 u1* stackmap_data = NULL;
2027 int stackmap_data_length = 0;
2028 u2 generic_signature_index = 0;
2029 MethodAnnotationCollector parsed_annotations;
2030 u1* runtime_visible_annotations = NULL;
2031 int runtime_visible_annotations_length = 0;
2032 u1* runtime_invisible_annotations = NULL;
2033 int runtime_invisible_annotations_length = 0;
2034 u1* runtime_visible_parameter_annotations = NULL;
2035 int runtime_visible_parameter_annotations_length = 0;
2036 u1* runtime_invisible_parameter_annotations = NULL;
2037 int runtime_invisible_parameter_annotations_length = 0;
2038 u1* runtime_visible_type_annotations = NULL;
2039 int runtime_visible_type_annotations_length = 0;
2040 u1* runtime_invisible_type_annotations = NULL;
2041 int runtime_invisible_type_annotations_length = 0;
2042 u1* annotation_default = NULL;
2043 int annotation_default_length = 0;
2044
2045 // Parse code and exceptions attribute
2046 u2 method_attributes_count = cfs->get_u2_fast();
2047 while (method_attributes_count--) {
2048 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2049 u2 method_attribute_name_index = cfs->get_u2_fast();
2050 u4 method_attribute_length = cfs->get_u4_fast();
2051 check_property(
2052 valid_symbol_at(method_attribute_name_index),
2053 "Invalid method attribute name index %u in class file %s",
2054 method_attribute_name_index, CHECK_(nullHandle));
2055
2056 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2057 if (method_attribute_name == vmSymbols::tag_code()) {
2058 // Parse Code attribute
2059 if (_need_verify) {
2060 guarantee_property(
2061 !access_flags.is_native() && !access_flags.is_abstract(),
2062 "Code attribute in native or abstract methods in class file %s",
2063 CHECK_(nullHandle));
2064 }
2065 if (parsed_code_attribute) {
2066 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2067 }
2068 parsed_code_attribute = true;
2069
2070 // Stack size, locals size, and code size
2071 if (_major_version == 45 && _minor_version <= 2) {
2072 cfs->guarantee_more(4, CHECK_(nullHandle));
2073 max_stack = cfs->get_u1_fast();
2074 max_locals = cfs->get_u1_fast();
2075 code_length = cfs->get_u2_fast();
2076 } else {
2077 cfs->guarantee_more(8, CHECK_(nullHandle));
2078 max_stack = cfs->get_u2_fast();
2079 max_locals = cfs->get_u2_fast();
2080 code_length = cfs->get_u4_fast();
2081 }
2082 if (_need_verify) {
2083 guarantee_property(args_size <= max_locals,
2084 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2085 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2086 "Invalid method Code length %u in class file %s",
2087 code_length, CHECK_(nullHandle));
2088 }
2089 // Code pointer
2090 code_start = cfs->get_u1_buffer();
2091 assert(code_start != NULL, "null code start");
2092 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2093 cfs->skip_u1_fast(code_length);
2094
2095 // Exception handler table
2096 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2097 exception_table_length = cfs->get_u2_fast();
2098 if (exception_table_length > 0) {
2099 exception_table_start =
2100 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2101 }
2102
2103 // Parse additional attributes in code attribute
2104 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2105 u2 code_attributes_count = cfs->get_u2_fast();
2106
2107 unsigned int calculated_attribute_length = 0;
2108
2109 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2110 calculated_attribute_length =
2111 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2112 } else {
2113 // max_stack, locals and length are smaller in pre-version 45.2 classes
2114 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2115 }
2116 calculated_attribute_length +=
2117 code_length +
2118 sizeof(exception_table_length) +
2119 sizeof(code_attributes_count) +
2120 exception_table_length *
2121 ( sizeof(u2) + // start_pc
2122 sizeof(u2) + // end_pc
2123 sizeof(u2) + // handler_pc
2124 sizeof(u2) ); // catch_type_index
2125
2126 while (code_attributes_count--) {
2127 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2128 u2 code_attribute_name_index = cfs->get_u2_fast();
2129 u4 code_attribute_length = cfs->get_u4_fast();
2130 calculated_attribute_length += code_attribute_length +
2131 sizeof(code_attribute_name_index) +
2132 sizeof(code_attribute_length);
2133 check_property(valid_symbol_at(code_attribute_name_index),
2134 "Invalid code attribute name index %u in class file %s",
2135 code_attribute_name_index,
2136 CHECK_(nullHandle));
2137 if (LoadLineNumberTables &&
2138 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2139 // Parse and compress line number table
2140 parse_linenumber_table(code_attribute_length, code_length,
2141 &linenumber_table, CHECK_(nullHandle));
2142
2143 } else if (LoadLocalVariableTables &&
2144 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2145 // Parse local variable table
2146 if (!lvt_allocated) {
2147 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2148 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2149 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2150 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2151 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2152 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2153 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2154 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2155 lvt_allocated = true;
2156 }
2157 if (lvt_cnt == max_lvt_cnt) {
2158 max_lvt_cnt <<= 1;
2159 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2160 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2161 }
2162 localvariable_table_start[lvt_cnt] =
2163 parse_localvariable_table(code_length,
2164 max_locals,
2165 code_attribute_length,
2166 &localvariable_table_length[lvt_cnt],
2167 false, // is not LVTT
2168 CHECK_(nullHandle));
2169 total_lvt_length += localvariable_table_length[lvt_cnt];
2170 lvt_cnt++;
2171 } else if (LoadLocalVariableTypeTables &&
2172 _major_version >= JAVA_1_5_VERSION &&
2173 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2174 if (!lvt_allocated) {
2175 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2176 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2177 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2178 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2179 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2180 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2181 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2182 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2183 lvt_allocated = true;
2184 }
2185 // Parse local variable type table
2186 if (lvtt_cnt == max_lvtt_cnt) {
2187 max_lvtt_cnt <<= 1;
2188 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2189 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2190 }
2191 localvariable_type_table_start[lvtt_cnt] =
2192 parse_localvariable_table(code_length,
2193 max_locals,
2194 code_attribute_length,
2195 &localvariable_type_table_length[lvtt_cnt],
2196 true, // is LVTT
2197 CHECK_(nullHandle));
2198 lvtt_cnt++;
2199 } else if (UseSplitVerifier &&
2200 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2201 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2202 // Stack map is only needed by the new verifier in JDK1.5.
2203 if (parsed_stackmap_attribute) {
2204 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2205 }
2206 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2207 stackmap_data_length = code_attribute_length;
2208 parsed_stackmap_attribute = true;
2209 } else {
2210 // Skip unknown attributes
2211 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2212 }
2213 }
2214 // check method attribute length
2215 if (_need_verify) {
2216 guarantee_property(method_attribute_length == calculated_attribute_length,
2217 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2218 }
2219 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2220 // Parse Exceptions attribute
2221 if (parsed_checked_exceptions_attribute) {
2222 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2223 }
2224 parsed_checked_exceptions_attribute = true;
2225 checked_exceptions_start =
2226 parse_checked_exceptions(&checked_exceptions_length,
2227 method_attribute_length,
2228 CHECK_(nullHandle));
2229 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2230 // reject multiple method parameters
2231 if (method_parameters_seen) {
2232 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2233 }
2234 method_parameters_seen = true;
2235 method_parameters_length = cfs->get_u1_fast();
2236 // Track the actual size (note: this is written for clarity; a
2237 // decent compiler will CSE and constant-fold this into a single
2238 // expression)
2239 // Use the attribute length to figure out the size of flags
2240 if (method_attribute_length == (method_parameters_length * 6u) + 1u) {
2241 method_parameters_four_byte_flags = true;
2242 } else if (method_attribute_length == (method_parameters_length * 4u) + 1u) {
2243 method_parameters_four_byte_flags = false;
2244 } else {
2245 classfile_parse_error(
2246 "Invalid MethodParameters method attribute length %u in class file",
2247 method_attribute_length, CHECK_(nullHandle));
2248 }
2249 method_parameters_data = cfs->get_u1_buffer();
2250 cfs->skip_u2_fast(method_parameters_length);
2251 if (method_parameters_four_byte_flags) {
2252 cfs->skip_u4_fast(method_parameters_length);
2253 } else {
2254 cfs->skip_u2_fast(method_parameters_length);
2255 }
2256 // ignore this attribute if it cannot be reflected
2257 if (!SystemDictionary::Parameter_klass_loaded())
2258 method_parameters_length = 0;
2259 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2260 if (method_attribute_length != 0) {
2261 classfile_parse_error(
2262 "Invalid Synthetic method attribute length %u in class file %s",
2263 method_attribute_length, CHECK_(nullHandle));
2264 }
2265 // Should we check that there hasn't already been a synthetic attribute?
2266 access_flags.set_is_synthetic();
2267 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2268 if (method_attribute_length != 0) {
2269 classfile_parse_error(
2270 "Invalid Deprecated method attribute length %u in class file %s",
2271 method_attribute_length, CHECK_(nullHandle));
2272 }
2273 } else if (_major_version >= JAVA_1_5_VERSION) {
2274 if (method_attribute_name == vmSymbols::tag_signature()) {
2275 if (method_attribute_length != 2) {
2276 classfile_parse_error(
2277 "Invalid Signature attribute length %u in class file %s",
2278 method_attribute_length, CHECK_(nullHandle));
2279 }
2280 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2281 generic_signature_index = cfs->get_u2_fast();
2282 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2283 runtime_visible_annotations_length = method_attribute_length;
2284 runtime_visible_annotations = cfs->get_u1_buffer();
2285 assert(runtime_visible_annotations != NULL, "null visible annotations");
2286 parse_annotations(runtime_visible_annotations,
2287 runtime_visible_annotations_length, &parsed_annotations,
2288 CHECK_(nullHandle));
2289 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2290 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2291 runtime_invisible_annotations_length = method_attribute_length;
2292 runtime_invisible_annotations = cfs->get_u1_buffer();
2293 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2294 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2295 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2296 runtime_visible_parameter_annotations_length = method_attribute_length;
2297 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2298 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2299 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2300 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2301 runtime_invisible_parameter_annotations_length = method_attribute_length;
2302 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2303 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2304 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2305 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2306 annotation_default_length = method_attribute_length;
2307 annotation_default = cfs->get_u1_buffer();
2308 assert(annotation_default != NULL, "null annotation default");
2309 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2310 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2311 runtime_visible_type_annotations_length = method_attribute_length;
2312 runtime_visible_type_annotations = cfs->get_u1_buffer();
2313 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2314 // No need for the VM to parse Type annotations
2315 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2316 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2317 runtime_invisible_type_annotations_length = method_attribute_length;
2318 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2319 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2320 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2321 } else {
2322 // Skip unknown attributes
2323 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2324 }
2325 } else {
2326 // Skip unknown attributes
2327 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2328 }
2329 }
2330
2331 if (linenumber_table != NULL) {
2332 linenumber_table->write_terminator();
2333 linenumber_table_length = linenumber_table->position();
2334 }
2335
2336 // Make sure there's at least one Code attribute in non-native/non-abstract method
2337 if (_need_verify) {
2338 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2339 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2340 }
2341
2342 // All sizing information for a Method* is finally available, now create it
2343 InlineTableSizes sizes(
2344 total_lvt_length,
2345 linenumber_table_length,
2346 exception_table_length,
2347 checked_exceptions_length,
2348 method_parameters_length,
2349 generic_signature_index,
2350 runtime_visible_annotations_length +
2351 runtime_invisible_annotations_length,
2352 runtime_visible_parameter_annotations_length +
2353 runtime_invisible_parameter_annotations_length,
2354 runtime_visible_type_annotations_length +
2355 runtime_invisible_type_annotations_length,
2356 annotation_default_length,
2357 0);
2358
2359 Method* m = Method::allocate(
2360 _loader_data, code_length, access_flags, &sizes,
2361 ConstMethod::NORMAL, CHECK_(nullHandle));
2362
2363 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2364
2365 // Fill in information from fixed part (access_flags already set)
2366 m->set_constants(_cp);
2367 m->set_name_index(name_index);
2368 m->set_signature_index(signature_index);
2369 #ifdef CC_INTERP
2370 // hmm is there a gc issue here??
2371 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2372 m->set_result_index(rtf.type());
2373 #endif
2374
2375 if (args_size >= 0) {
2376 m->set_size_of_parameters(args_size);
2377 } else {
2378 m->compute_size_of_parameters(THREAD);
2379 }
2380 #ifdef ASSERT
2381 if (args_size >= 0) {
2382 m->compute_size_of_parameters(THREAD);
2383 assert(args_size == m->size_of_parameters(), "");
2384 }
2385 #endif
2386
2387 // Fill in code attribute information
2388 m->set_max_stack(max_stack);
2389 m->set_max_locals(max_locals);
2390 if (stackmap_data != NULL) {
2391 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2392 stackmap_data_length, CHECK_NULL);
2393 }
2394
2395 // Copy byte codes
2396 m->set_code(code_start);
2397
2398 // Copy line number table
2399 if (linenumber_table != NULL) {
2400 memcpy(m->compressed_linenumber_table(),
2401 linenumber_table->buffer(), linenumber_table_length);
2402 }
2403
2404 // Copy exception table
2405 if (exception_table_length > 0) {
2406 int size =
2407 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2408 copy_u2_with_conversion((u2*) m->exception_table_start(),
2409 exception_table_start, size);
2410 }
2411
2412 // Copy method parameters
2413 if (method_parameters_length > 0) {
2414 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2415 for (int i = 0; i < method_parameters_length; i++) {
2416 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2417 method_parameters_data += 2;
2418 if (method_parameters_four_byte_flags) {
2419 elem[i].flags = Bytes::get_Java_u4(method_parameters_data);
2420 method_parameters_data += 4;
2421 } else {
2422 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2423 method_parameters_data += 2;
2424 }
2425 }
2426 }
2427
2428 // Copy checked exceptions
2429 if (checked_exceptions_length > 0) {
2430 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2431 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2432 }
2433
2434 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2435 if (total_lvt_length > 0) {
2436 promoted_flags->set_has_localvariable_table();
2437 copy_localvariable_table(m->constMethod(), lvt_cnt,
2438 localvariable_table_length,
2439 localvariable_table_start,
2440 lvtt_cnt,
2441 localvariable_type_table_length,
2442 localvariable_type_table_start, CHECK_NULL);
2443 }
2444
2445 if (parsed_annotations.has_any_annotations())
2446 parsed_annotations.apply_to(m);
2447
2448 // Copy annotations
2449 copy_method_annotations(m->constMethod(),
2450 runtime_visible_annotations,
2451 runtime_visible_annotations_length,
2452 runtime_invisible_annotations,
2453 runtime_invisible_annotations_length,
2454 runtime_visible_parameter_annotations,
2455 runtime_visible_parameter_annotations_length,
2456 runtime_invisible_parameter_annotations,
2457 runtime_invisible_parameter_annotations_length,
2458 runtime_visible_type_annotations,
2459 runtime_visible_type_annotations_length,
2460 runtime_invisible_type_annotations,
2461 runtime_invisible_type_annotations_length,
2462 annotation_default,
2463 annotation_default_length,
2464 CHECK_NULL);
2465
2466 if (name == vmSymbols::finalize_method_name() &&
2467 signature == vmSymbols::void_method_signature()) {
2468 if (m->is_empty_method()) {
2469 _has_empty_finalizer = true;
2470 } else {
2471 _has_finalizer = true;
2472 }
2473 }
2474 if (name == vmSymbols::object_initializer_name() &&
2475 signature == vmSymbols::void_method_signature() &&
2476 m->is_vanilla_constructor()) {
2477 _has_vanilla_constructor = true;
2478 }
2479
2480 NOT_PRODUCT(m->verify());
2481 return m;
2482 }
2483
2484
2485 // The promoted_flags parameter is used to pass relevant access_flags
2486 // from the methods back up to the containing klass. These flag values
2487 // are added to klass's access_flags.
2488
2489 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2490 AccessFlags* promoted_flags,
2491 bool* has_final_method,
2492 bool* has_default_methods,
2493 TRAPS) {
2494 ClassFileStream* cfs = stream();
2495 cfs->guarantee_more(2, CHECK_NULL); // length
2496 u2 length = cfs->get_u2_fast();
2497 if (length == 0) {
2498 _methods = Universe::the_empty_method_array();
2499 } else {
2500 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2501
2502 HandleMark hm(THREAD);
2503 for (int index = 0; index < length; index++) {
2504 methodHandle method = parse_method(is_interface,
2505 promoted_flags,
2506 CHECK_NULL);
2507
2508 if (method->is_final()) {
2509 *has_final_method = true;
2510 }
2511 if (is_interface && !method->is_abstract() && !method->is_static()) {
2512 // default method
2513 *has_default_methods = true;
2514 }
2515 _methods->at_put(index, method());
2516 }
2517
2518 if (_need_verify && length > 1) {
2519 // Check duplicated methods
2520 ResourceMark rm(THREAD);
2521 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2522 THREAD, NameSigHash*, HASH_ROW_SIZE);
2523 initialize_hashtable(names_and_sigs);
2524 bool dup = false;
2525 {
2526 debug_only(No_Safepoint_Verifier nsv;)
2527 for (int i = 0; i < length; i++) {
2528 Method* m = _methods->at(i);
2529 // If no duplicates, add name/signature in hashtable names_and_sigs.
2530 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2531 dup = true;
2532 break;
2533 }
2534 }
2535 }
2536 if (dup) {
2537 classfile_parse_error("Duplicate method name&signature in class file %s",
2538 CHECK_NULL);
2539 }
2540 }
2541 }
2542 return _methods;
2543 }
2544
2545
2546 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2547 int length = methods->length();
2548 // If JVMTI original method ordering or sharing is enabled we have to
2549 // remember the original class file ordering.
2550 // We temporarily use the vtable_index field in the Method* to store the
2551 // class file index, so we can read in after calling qsort.
2552 // Put the method ordering in the shared archive.
2553 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2554 for (int index = 0; index < length; index++) {
2555 Method* m = methods->at(index);
2556 assert(!m->valid_vtable_index(), "vtable index should not be set");
2557 m->set_vtable_index(index);
2558 }
2559 }
2560 // Sort method array by ascending method name (for faster lookups & vtable construction)
2561 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2562 Method::sort_methods(methods);
2563
2564 intArray* method_ordering = NULL;
2565 // If JVMTI original method ordering or sharing is enabled construct int
2566 // array remembering the original ordering
2567 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2568 method_ordering = new intArray(length);
2569 for (int index = 0; index < length; index++) {
2570 Method* m = methods->at(index);
2571 int old_index = m->vtable_index();
2572 assert(old_index >= 0 && old_index < length, "invalid method index");
2573 method_ordering->at_put(index, old_index);
2574 m->set_vtable_index(Method::invalid_vtable_index);
2575 }
2576 }
2577 return method_ordering;
2578 }
2579
2580
2581 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2582 ClassFileStream* cfs = stream();
2583 cfs->guarantee_more(2, CHECK); // sourcefile_index
2584 u2 sourcefile_index = cfs->get_u2_fast();
2585 check_property(
2586 valid_symbol_at(sourcefile_index),
2587 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2588 sourcefile_index, CHECK);
2589 set_class_sourcefile(_cp->symbol_at(sourcefile_index));
2590 }
2591
2592
2593
2594 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2595 ClassFileStream* cfs = stream();
2596 u1* sde_buffer = cfs->get_u1_buffer();
2597 assert(sde_buffer != NULL, "null sde buffer");
2598
2599 // Don't bother storing it if there is no way to retrieve it
2600 if (JvmtiExport::can_get_source_debug_extension()) {
2601 assert((length+1) > length, "Overflow checking");
2602 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2603 for (int i = 0; i < length; i++) {
2604 sde[i] = sde_buffer[i];
2605 }
2606 sde[length] = '\0';
2607 set_class_sde_buffer((char*)sde, length);
2608 }
2609 // Got utf8 string, set stream position forward
2610 cfs->skip_u1(length, CHECK);
2611 }
2612
2613
2614 // Inner classes can be static, private or protected (classic VM does this)
2615 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2616
2617 // Return number of classes in the inner classes attribute table
2618 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2619 bool parsed_enclosingmethod_attribute,
2620 u2 enclosing_method_class_index,
2621 u2 enclosing_method_method_index,
2622 TRAPS) {
2623 ClassFileStream* cfs = stream();
2624 u1* current_mark = cfs->current();
2625 u2 length = 0;
2626 if (inner_classes_attribute_start != NULL) {
2627 cfs->set_current(inner_classes_attribute_start);
2628 cfs->guarantee_more(2, CHECK_0); // length
2629 length = cfs->get_u2_fast();
2630 }
2631
2632 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2633 // method data:
2634 // [inner_class_info_index,
2635 // outer_class_info_index,
2636 // inner_name_index,
2637 // inner_class_access_flags,
2638 // ...
2639 // enclosing_method_class_index,
2640 // enclosing_method_method_index]
2641 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2642 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2643 _inner_classes = inner_classes;
2644
2645 int index = 0;
2646 int cp_size = _cp->length();
2647 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2648 for (int n = 0; n < length; n++) {
2649 // Inner class index
2650 u2 inner_class_info_index = cfs->get_u2_fast();
2651 check_property(
2652 inner_class_info_index == 0 ||
2653 valid_klass_reference_at(inner_class_info_index),
2654 "inner_class_info_index %u has bad constant type in class file %s",
2655 inner_class_info_index, CHECK_0);
2656 // Outer class index
2657 u2 outer_class_info_index = cfs->get_u2_fast();
2658 check_property(
2659 outer_class_info_index == 0 ||
2660 valid_klass_reference_at(outer_class_info_index),
2661 "outer_class_info_index %u has bad constant type in class file %s",
2662 outer_class_info_index, CHECK_0);
2663 // Inner class name
2664 u2 inner_name_index = cfs->get_u2_fast();
2665 check_property(
2666 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2667 "inner_name_index %u has bad constant type in class file %s",
2668 inner_name_index, CHECK_0);
2669 if (_need_verify) {
2670 guarantee_property(inner_class_info_index != outer_class_info_index,
2671 "Class is both outer and inner class in class file %s", CHECK_0);
2672 }
2673 // Access flags
2674 AccessFlags inner_access_flags;
2675 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2676 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2677 // Set abstract bit for old class files for backward compatibility
2678 flags |= JVM_ACC_ABSTRACT;
2679 }
2680 verify_legal_class_modifiers(flags, CHECK_0);
2681 inner_access_flags.set_flags(flags);
2682
2683 inner_classes->at_put(index++, inner_class_info_index);
2684 inner_classes->at_put(index++, outer_class_info_index);
2685 inner_classes->at_put(index++, inner_name_index);
2686 inner_classes->at_put(index++, inner_access_flags.as_short());
2687 }
2688
2689 // 4347400: make sure there's no duplicate entry in the classes array
2690 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2691 for(int i = 0; i < length * 4; i += 4) {
2692 for(int j = i + 4; j < length * 4; j += 4) {
2693 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2694 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2695 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2696 inner_classes->at(i+3) != inner_classes->at(j+3)),
2697 "Duplicate entry in InnerClasses in class file %s",
2698 CHECK_0);
2699 }
2700 }
2701 }
2702
2703 // Set EnclosingMethod class and method indexes.
2704 if (parsed_enclosingmethod_attribute) {
2705 inner_classes->at_put(index++, enclosing_method_class_index);
2706 inner_classes->at_put(index++, enclosing_method_method_index);
2707 }
2708 assert(index == size, "wrong size");
2709
2710 // Restore buffer's current position.
2711 cfs->set_current(current_mark);
2712
2713 return length;
2714 }
2715
2716 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2717 set_class_synthetic_flag(true);
2718 }
2719
2720 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2721 ClassFileStream* cfs = stream();
2722 u2 signature_index = cfs->get_u2(CHECK);
2723 check_property(
2724 valid_symbol_at(signature_index),
2725 "Invalid constant pool index %u in Signature attribute in class file %s",
2726 signature_index, CHECK);
2727 set_class_generic_signature(_cp->symbol_at(signature_index));
2728 }
2729
2730 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2731 ClassFileStream* cfs = stream();
2732 u1* current_start = cfs->current();
2733
2734 cfs->guarantee_more(2, CHECK); // length
2735 int attribute_array_length = cfs->get_u2_fast();
2736
2737 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2738 "Short length on BootstrapMethods in class file %s",
2739 CHECK);
2740
2741 // The attribute contains a counted array of counted tuples of shorts,
2742 // represending bootstrap specifiers:
2743 // length*{bootstrap_method_index, argument_count*{argument_index}}
2744 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2745 // operand_count = number of shorts in attr, except for leading length
2746
2747 // The attribute is copied into a short[] array.
2748 // The array begins with a series of short[2] pairs, one for each tuple.
2749 int index_size = (attribute_array_length * 2);
2750
2751 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2752
2753 // Eagerly assign operands so they will be deallocated with the constant
2754 // pool if there is an error.
2755 _cp->set_operands(operands);
2756
2757 int operand_fill_index = index_size;
2758 int cp_size = _cp->length();
2759
2760 for (int n = 0; n < attribute_array_length; n++) {
2761 // Store a 32-bit offset into the header of the operand array.
2762 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2763
2764 // Read a bootstrap specifier.
2765 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2766 u2 bootstrap_method_index = cfs->get_u2_fast();
2767 u2 argument_count = cfs->get_u2_fast();
2768 check_property(
2769 valid_cp_range(bootstrap_method_index, cp_size) &&
2770 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2771 "bootstrap_method_index %u has bad constant type in class file %s",
2772 bootstrap_method_index,
2773 CHECK);
2774 operands->at_put(operand_fill_index++, bootstrap_method_index);
2775 operands->at_put(operand_fill_index++, argument_count);
2776
2777 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2778 for (int j = 0; j < argument_count; j++) {
2779 u2 argument_index = cfs->get_u2_fast();
2780 check_property(
2781 valid_cp_range(argument_index, cp_size) &&
2782 _cp->tag_at(argument_index).is_loadable_constant(),
2783 "argument_index %u has bad constant type in class file %s",
2784 argument_index,
2785 CHECK);
2786 operands->at_put(operand_fill_index++, argument_index);
2787 }
2788 }
2789
2790 assert(operand_fill_index == operands->length(), "exact fill");
2791 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2792
2793 u1* current_end = cfs->current();
2794 guarantee_property(current_end == current_start + attribute_byte_length,
2795 "Bad length on BootstrapMethods in class file %s",
2796 CHECK);
2797 }
2798
2799 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2800 TRAPS) {
2801 ClassFileStream* cfs = stream();
2802 // Set inner classes attribute to default sentinel
2803 _inner_classes = Universe::the_empty_short_array();
2804 cfs->guarantee_more(2, CHECK); // attributes_count
2805 u2 attributes_count = cfs->get_u2_fast();
2806 bool parsed_sourcefile_attribute = false;
2807 bool parsed_innerclasses_attribute = false;
2808 bool parsed_enclosingmethod_attribute = false;
2809 bool parsed_bootstrap_methods_attribute = false;
2810 u1* runtime_visible_annotations = NULL;
2811 int runtime_visible_annotations_length = 0;
2812 u1* runtime_invisible_annotations = NULL;
2813 int runtime_invisible_annotations_length = 0;
2814 u1* runtime_visible_type_annotations = NULL;
2815 int runtime_visible_type_annotations_length = 0;
2816 u1* runtime_invisible_type_annotations = NULL;
2817 int runtime_invisible_type_annotations_length = 0;
2818 u1* inner_classes_attribute_start = NULL;
2819 u4 inner_classes_attribute_length = 0;
2820 u2 enclosing_method_class_index = 0;
2821 u2 enclosing_method_method_index = 0;
2822 // Iterate over attributes
2823 while (attributes_count--) {
2824 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2825 u2 attribute_name_index = cfs->get_u2_fast();
2826 u4 attribute_length = cfs->get_u4_fast();
2827 check_property(
2828 valid_symbol_at(attribute_name_index),
2829 "Attribute name has bad constant pool index %u in class file %s",
2830 attribute_name_index, CHECK);
2831 Symbol* tag = _cp->symbol_at(attribute_name_index);
2832 if (tag == vmSymbols::tag_source_file()) {
2833 // Check for SourceFile tag
2834 if (_need_verify) {
2835 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2836 }
2837 if (parsed_sourcefile_attribute) {
2838 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2839 } else {
2840 parsed_sourcefile_attribute = true;
2841 }
2842 parse_classfile_sourcefile_attribute(CHECK);
2843 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2844 // Check for SourceDebugExtension tag
2845 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2846 } else if (tag == vmSymbols::tag_inner_classes()) {
2847 // Check for InnerClasses tag
2848 if (parsed_innerclasses_attribute) {
2849 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2850 } else {
2851 parsed_innerclasses_attribute = true;
2852 }
2853 inner_classes_attribute_start = cfs->get_u1_buffer();
2854 inner_classes_attribute_length = attribute_length;
2855 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2856 } else if (tag == vmSymbols::tag_synthetic()) {
2857 // Check for Synthetic tag
2858 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2859 if (attribute_length != 0) {
2860 classfile_parse_error(
2861 "Invalid Synthetic classfile attribute length %u in class file %s",
2862 attribute_length, CHECK);
2863 }
2864 parse_classfile_synthetic_attribute(CHECK);
2865 } else if (tag == vmSymbols::tag_deprecated()) {
2866 // Check for Deprecatd tag - 4276120
2867 if (attribute_length != 0) {
2868 classfile_parse_error(
2869 "Invalid Deprecated classfile attribute length %u in class file %s",
2870 attribute_length, CHECK);
2871 }
2872 } else if (_major_version >= JAVA_1_5_VERSION) {
2873 if (tag == vmSymbols::tag_signature()) {
2874 if (attribute_length != 2) {
2875 classfile_parse_error(
2876 "Wrong Signature attribute length %u in class file %s",
2877 attribute_length, CHECK);
2878 }
2879 parse_classfile_signature_attribute(CHECK);
2880 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2881 runtime_visible_annotations_length = attribute_length;
2882 runtime_visible_annotations = cfs->get_u1_buffer();
2883 assert(runtime_visible_annotations != NULL, "null visible annotations");
2884 parse_annotations(runtime_visible_annotations,
2885 runtime_visible_annotations_length,
2886 parsed_annotations,
2887 CHECK);
2888 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2889 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2890 runtime_invisible_annotations_length = attribute_length;
2891 runtime_invisible_annotations = cfs->get_u1_buffer();
2892 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2893 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2894 } else if (tag == vmSymbols::tag_enclosing_method()) {
2895 if (parsed_enclosingmethod_attribute) {
2896 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2897 } else {
2898 parsed_enclosingmethod_attribute = true;
2899 }
2900 cfs->guarantee_more(4, CHECK); // class_index, method_index
2901 enclosing_method_class_index = cfs->get_u2_fast();
2902 enclosing_method_method_index = cfs->get_u2_fast();
2903 if (enclosing_method_class_index == 0) {
2904 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2905 }
2906 // Validate the constant pool indices and types
2907 check_property(valid_klass_reference_at(enclosing_method_class_index),
2908 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2909 if (enclosing_method_method_index != 0 &&
2910 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2911 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2912 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2913 }
2914 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2915 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2916 if (parsed_bootstrap_methods_attribute)
2917 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2918 parsed_bootstrap_methods_attribute = true;
2919 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2920 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2921 runtime_visible_type_annotations_length = attribute_length;
2922 runtime_visible_type_annotations = cfs->get_u1_buffer();
2923 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2924 // No need for the VM to parse Type annotations
2925 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2926 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2927 runtime_invisible_type_annotations_length = attribute_length;
2928 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2929 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2930 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2931 } else {
2932 // Unknown attribute
2933 cfs->skip_u1(attribute_length, CHECK);
2934 }
2935 } else {
2936 // Unknown attribute
2937 cfs->skip_u1(attribute_length, CHECK);
2938 }
2939 }
2940 _annotations = assemble_annotations(runtime_visible_annotations,
2941 runtime_visible_annotations_length,
2942 runtime_invisible_annotations,
2943 runtime_invisible_annotations_length,
2944 CHECK);
2945 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
2946 runtime_visible_type_annotations_length,
2947 runtime_invisible_type_annotations,
2948 runtime_invisible_type_annotations_length,
2949 CHECK);
2950
2951 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2952 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2953 inner_classes_attribute_start,
2954 parsed_innerclasses_attribute,
2955 enclosing_method_class_index,
2956 enclosing_method_method_index,
2957 CHECK);
2958 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2959 guarantee_property(
2960 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2961 "Wrong InnerClasses attribute length in class file %s", CHECK);
2962 }
2963 }
2964
2965 if (_max_bootstrap_specifier_index >= 0) {
2966 guarantee_property(parsed_bootstrap_methods_attribute,
2967 "Missing BootstrapMethods attribute in class file %s", CHECK);
2968 }
2969 }
2970
2971 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2972 if (_synthetic_flag)
2973 k->set_is_synthetic();
2974 if (_sourcefile != NULL) {
2975 _sourcefile->increment_refcount();
2976 k->set_source_file_name(_sourcefile);
2977 }
2978 if (_generic_signature != NULL) {
2979 _generic_signature->increment_refcount();
2980 k->set_generic_signature(_generic_signature);
2981 }
2982 if (_sde_buffer != NULL) {
2983 k->set_source_debug_extension(_sde_buffer, _sde_length);
2984 }
2985 }
2986
2987 // Transfer ownership of metadata allocated to the InstanceKlass.
2988 void ClassFileParser::apply_parsed_class_metadata(
2989 instanceKlassHandle this_klass,
2990 int java_fields_count, TRAPS) {
2991 // Assign annotations if needed
2992 if (_annotations != NULL || _type_annotations != NULL ||
2993 _fields_annotations != NULL || _fields_type_annotations != NULL) {
2994 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
2995 annotations->set_class_annotations(_annotations);
2996 annotations->set_class_type_annotations(_type_annotations);
2997 annotations->set_fields_annotations(_fields_annotations);
2998 annotations->set_fields_type_annotations(_fields_type_annotations);
2999 this_klass->set_annotations(annotations);
3000 }
3001
3002 _cp->set_pool_holder(this_klass());
3003 this_klass->set_constants(_cp);
3004 this_klass->set_fields(_fields, java_fields_count);
3005 this_klass->set_methods(_methods);
3006 this_klass->set_inner_classes(_inner_classes);
3007 this_klass->set_local_interfaces(_local_interfaces);
3008 this_klass->set_transitive_interfaces(_transitive_interfaces);
3009
3010 // Clear out these fields so they don't get deallocated by the destructor
3011 clear_class_metadata();
3012 }
3013
3014 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3015 int runtime_visible_annotations_length,
3016 u1* runtime_invisible_annotations,
3017 int runtime_invisible_annotations_length, TRAPS) {
3018 AnnotationArray* annotations = NULL;
3019 if (runtime_visible_annotations != NULL ||
3020 runtime_invisible_annotations != NULL) {
3021 annotations = MetadataFactory::new_array<u1>(_loader_data,
3022 runtime_visible_annotations_length +
3023 runtime_invisible_annotations_length,
3024 CHECK_(annotations));
3025 if (runtime_visible_annotations != NULL) {
3026 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3027 annotations->at_put(i, runtime_visible_annotations[i]);
3028 }
3029 }
3030 if (runtime_invisible_annotations != NULL) {
3031 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3032 int append = runtime_visible_annotations_length+i;
3033 annotations->at_put(append, runtime_invisible_annotations[i]);
3034 }
3035 }
3036 }
3037 return annotations;
3038 }
3039
3040
3041 #ifndef PRODUCT
3042 static void parseAndPrintGenericSignatures(
3043 instanceKlassHandle this_klass, TRAPS) {
3044 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3045 ResourceMark rm;
3046
3047 if (this_klass->generic_signature() != NULL) {
3048 using namespace generic;
3049 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3050
3051 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3052 spec->print_on(tty);
3053
3054 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3055 Method* m = this_klass->methods()->at(i);
3056 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3057 Symbol* sig = m->generic_signature();
3058 if (sig == NULL) {
3059 sig = m->signature();
3060 }
3061 tty->print_cr("Parsing %s", sig->as_C_string());
3062 method_spec->print_on(tty);
3063 }
3064 }
3065 }
3066 #endif // ndef PRODUCT
3067
3068
3069 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3070 TRAPS) {
3071 instanceKlassHandle super_klass;
3072 if (super_class_index == 0) {
3073 check_property(_class_name == vmSymbols::java_lang_Object(),
3074 "Invalid superclass index %u in class file %s",
3075 super_class_index,
3076 CHECK_NULL);
3077 } else {
3078 check_property(valid_klass_reference_at(super_class_index),
3079 "Invalid superclass index %u in class file %s",
3080 super_class_index,
3081 CHECK_NULL);
3082 // The class name should be legal because it is checked when parsing constant pool.
3083 // However, make sure it is not an array type.
3084 bool is_array = false;
3085 if (_cp->tag_at(super_class_index).is_klass()) {
3086 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3087 if (_need_verify)
3088 is_array = super_klass->oop_is_array();
3089 } else if (_need_verify) {
3090 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3091 }
3092 if (_need_verify) {
3093 guarantee_property(!is_array,
3094 "Bad superclass name in class file %s", CHECK_NULL);
3095 }
3096 }
3097 return super_klass;
3098 }
3099
3100
3101 // Values needed for oopmap and InstanceKlass creation
3102 class FieldLayoutInfo : public StackObj {
3103 public:
3104 int* nonstatic_oop_offsets;
3105 unsigned int* nonstatic_oop_counts;
3106 unsigned int nonstatic_oop_map_count;
3107 unsigned int total_oop_map_count;
3108 int instance_size;
3109 int nonstatic_field_size;
3110 int static_field_size;
3111 bool has_nonstatic_fields;
3112 };
3113
3114 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3115 void ClassFileParser::layout_fields(Handle class_loader,
3116 FieldAllocationCount* fac,
3117 ClassAnnotationCollector* parsed_annotations,
3118 FieldLayoutInfo* info,
3119 TRAPS) {
3120
3121 // get the padding width from the option
3122 // TODO: Ask VM about specific CPU we are running on
3123 int pad_size = ContendedPaddingWidth;
3124
3125 // Field size and offset computation
3126 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3127 #ifndef PRODUCT
3128 int orig_nonstatic_field_size = 0;
3129 #endif
3130 int next_static_oop_offset;
3131 int next_static_double_offset;
3132 int next_static_word_offset;
3133 int next_static_short_offset;
3134 int next_static_byte_offset;
3135 int next_nonstatic_oop_offset;
3136 int next_nonstatic_double_offset;
3137 int next_nonstatic_word_offset;
3138 int next_nonstatic_short_offset;
3139 int next_nonstatic_byte_offset;
3140 int next_nonstatic_type_offset;
3141 int first_nonstatic_oop_offset;
3142 int first_nonstatic_field_offset;
3143 int next_nonstatic_field_offset;
3144 int next_nonstatic_padded_offset;
3145
3146 // Count the contended fields by type.
3147 int nonstatic_contended_count = 0;
3148 FieldAllocationCount fac_contended;
3149 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3150 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3151 if (fs.is_contended()) {
3152 fac_contended.count[atype]++;
3153 if (!fs.access_flags().is_static()) {
3154 nonstatic_contended_count++;
3155 }
3156 }
3157 }
3158 int contended_count = nonstatic_contended_count;
3159
3160
3161 // Calculate the starting byte offsets
3162 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3163 next_static_double_offset = next_static_oop_offset +
3164 ((fac->count[STATIC_OOP]) * heapOopSize);
3165 if ( fac->count[STATIC_DOUBLE] &&
3166 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3167 Universe::field_type_should_be_aligned(T_LONG)) ) {
3168 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3169 }
3170
3171 next_static_word_offset = next_static_double_offset +
3172 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3173 next_static_short_offset = next_static_word_offset +
3174 ((fac->count[STATIC_WORD]) * BytesPerInt);
3175 next_static_byte_offset = next_static_short_offset +
3176 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3177
3178 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3179 nonstatic_field_size * heapOopSize;
3180
3181 // class is contended, pad before all the fields
3182 if (parsed_annotations->is_contended()) {
3183 first_nonstatic_field_offset += pad_size;
3184 }
3185
3186 next_nonstatic_field_offset = first_nonstatic_field_offset;
3187
3188 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3189 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3190 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3191 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3192 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3193
3194 bool super_has_nonstatic_fields =
3195 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3196 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3197 ((nonstatic_double_count + nonstatic_word_count +
3198 nonstatic_short_count + nonstatic_byte_count +
3199 nonstatic_oop_count) != 0);
3200
3201
3202 // Prepare list of oops for oop map generation.
3203 int* nonstatic_oop_offsets;
3204 unsigned int* nonstatic_oop_counts;
3205 unsigned int nonstatic_oop_map_count = 0;
3206
3207 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3208 THREAD, int, nonstatic_oop_count + 1);
3209 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3210 THREAD, unsigned int, nonstatic_oop_count + 1);
3211
3212 first_nonstatic_oop_offset = 0; // will be set for first oop field
3213
3214 #ifndef PRODUCT
3215 if( PrintCompactFieldsSavings ) {
3216 next_nonstatic_double_offset = next_nonstatic_field_offset +
3217 (nonstatic_oop_count * heapOopSize);
3218 if ( nonstatic_double_count > 0 ) {
3219 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3220 }
3221 next_nonstatic_word_offset = next_nonstatic_double_offset +
3222 (nonstatic_double_count * BytesPerLong);
3223 next_nonstatic_short_offset = next_nonstatic_word_offset +
3224 (nonstatic_word_count * BytesPerInt);
3225 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3226 (nonstatic_short_count * BytesPerShort);
3227 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3228 nonstatic_byte_count ), heapOopSize );
3229 orig_nonstatic_field_size = nonstatic_field_size +
3230 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3231 }
3232 #endif
3233 bool compact_fields = CompactFields;
3234 int allocation_style = FieldsAllocationStyle;
3235 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3236 assert(false, "0 <= FieldsAllocationStyle <= 2");
3237 allocation_style = 1; // Optimistic
3238 }
3239
3240 // The next classes have predefined hard-coded fields offsets
3241 // (see in JavaClasses::compute_hard_coded_offsets()).
3242 // Use default fields allocation order for them.
3243 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3244 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3245 _class_name == vmSymbols::java_lang_Class() ||
3246 _class_name == vmSymbols::java_lang_ClassLoader() ||
3247 _class_name == vmSymbols::java_lang_ref_Reference() ||
3248 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3249 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3250 _class_name == vmSymbols::java_lang_String() ||
3251 _class_name == vmSymbols::java_lang_Throwable() ||
3252 _class_name == vmSymbols::java_lang_Boolean() ||
3253 _class_name == vmSymbols::java_lang_Character() ||
3254 _class_name == vmSymbols::java_lang_Float() ||
3255 _class_name == vmSymbols::java_lang_Double() ||
3256 _class_name == vmSymbols::java_lang_Byte() ||
3257 _class_name == vmSymbols::java_lang_Short() ||
3258 _class_name == vmSymbols::java_lang_Integer() ||
3259 _class_name == vmSymbols::java_lang_Long())) {
3260 allocation_style = 0; // Allocate oops first
3261 compact_fields = false; // Don't compact fields
3262 }
3263
3264 if( allocation_style == 0 ) {
3265 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3266 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3267 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3268 (nonstatic_oop_count * heapOopSize);
3269 } else if( allocation_style == 1 ) {
3270 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3271 next_nonstatic_double_offset = next_nonstatic_field_offset;
3272 } else if( allocation_style == 2 ) {
3273 // Fields allocation: oops fields in super and sub classes are together.
3274 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3275 _super_klass->nonstatic_oop_map_size() > 0 ) {
3276 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3277 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3278 OopMapBlock* last_map = first_map + map_count - 1;
3279 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3280 if (next_offset == next_nonstatic_field_offset) {
3281 allocation_style = 0; // allocate oops first
3282 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3283 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3284 (nonstatic_oop_count * heapOopSize);
3285 }
3286 }
3287 if( allocation_style == 2 ) {
3288 allocation_style = 1; // allocate oops last
3289 next_nonstatic_double_offset = next_nonstatic_field_offset;
3290 }
3291 } else {
3292 ShouldNotReachHere();
3293 }
3294
3295 int nonstatic_oop_space_count = 0;
3296 int nonstatic_word_space_count = 0;
3297 int nonstatic_short_space_count = 0;
3298 int nonstatic_byte_space_count = 0;
3299 int nonstatic_oop_space_offset;
3300 int nonstatic_word_space_offset;
3301 int nonstatic_short_space_offset;
3302 int nonstatic_byte_space_offset;
3303
3304 if( nonstatic_double_count > 0 ) {
3305 int offset = next_nonstatic_double_offset;
3306 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3307 if( compact_fields && offset != next_nonstatic_double_offset ) {
3308 // Allocate available fields into the gap before double field.
3309 int length = next_nonstatic_double_offset - offset;
3310 assert(length == BytesPerInt, "");
3311 nonstatic_word_space_offset = offset;
3312 if( nonstatic_word_count > 0 ) {
3313 nonstatic_word_count -= 1;
3314 nonstatic_word_space_count = 1; // Only one will fit
3315 length -= BytesPerInt;
3316 offset += BytesPerInt;
3317 }
3318 nonstatic_short_space_offset = offset;
3319 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3320 nonstatic_short_count -= 1;
3321 nonstatic_short_space_count += 1;
3322 length -= BytesPerShort;
3323 offset += BytesPerShort;
3324 }
3325 nonstatic_byte_space_offset = offset;
3326 while( length > 0 && nonstatic_byte_count > 0 ) {
3327 nonstatic_byte_count -= 1;
3328 nonstatic_byte_space_count += 1;
3329 length -= 1;
3330 }
3331 // Allocate oop field in the gap if there are no other fields for that.
3332 nonstatic_oop_space_offset = offset;
3333 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3334 allocation_style != 0 ) { // when oop fields not first
3335 nonstatic_oop_count -= 1;
3336 nonstatic_oop_space_count = 1; // Only one will fit
3337 length -= heapOopSize;
3338 offset += heapOopSize;
3339 }
3340 }
3341 }
3342
3343 next_nonstatic_word_offset = next_nonstatic_double_offset +
3344 (nonstatic_double_count * BytesPerLong);
3345 next_nonstatic_short_offset = next_nonstatic_word_offset +
3346 (nonstatic_word_count * BytesPerInt);
3347 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3348 (nonstatic_short_count * BytesPerShort);
3349 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3350 nonstatic_byte_count;
3351
3352 // let oops jump before padding with this allocation style
3353 if( allocation_style == 1 ) {
3354 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3355 if( nonstatic_oop_count > 0 ) {
3356 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3357 }
3358 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3359 }
3360
3361 // Iterate over fields again and compute correct offsets.
3362 // The field allocation type was temporarily stored in the offset slot.
3363 // oop fields are located before non-oop fields (static and non-static).
3364 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3365
3366 // skip already laid out fields
3367 if (fs.is_offset_set()) continue;
3368
3369 // contended instance fields are handled below
3370 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3371
3372 int real_offset;
3373 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3374
3375 // pack the rest of the fields
3376 switch (atype) {
3377 case STATIC_OOP:
3378 real_offset = next_static_oop_offset;
3379 next_static_oop_offset += heapOopSize;
3380 break;
3381 case STATIC_BYTE:
3382 real_offset = next_static_byte_offset;
3383 next_static_byte_offset += 1;
3384 break;
3385 case STATIC_SHORT:
3386 real_offset = next_static_short_offset;
3387 next_static_short_offset += BytesPerShort;
3388 break;
3389 case STATIC_WORD:
3390 real_offset = next_static_word_offset;
3391 next_static_word_offset += BytesPerInt;
3392 break;
3393 case STATIC_DOUBLE:
3394 real_offset = next_static_double_offset;
3395 next_static_double_offset += BytesPerLong;
3396 break;
3397 case NONSTATIC_OOP:
3398 if( nonstatic_oop_space_count > 0 ) {
3399 real_offset = nonstatic_oop_space_offset;
3400 nonstatic_oop_space_offset += heapOopSize;
3401 nonstatic_oop_space_count -= 1;
3402 } else {
3403 real_offset = next_nonstatic_oop_offset;
3404 next_nonstatic_oop_offset += heapOopSize;
3405 }
3406 // Update oop maps
3407 if( nonstatic_oop_map_count > 0 &&
3408 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3409 real_offset -
3410 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3411 heapOopSize ) {
3412 // Extend current oop map
3413 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3414 } else {
3415 // Create new oop map
3416 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3417 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3418 nonstatic_oop_map_count += 1;
3419 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3420 first_nonstatic_oop_offset = real_offset;
3421 }
3422 }
3423 break;
3424 case NONSTATIC_BYTE:
3425 if( nonstatic_byte_space_count > 0 ) {
3426 real_offset = nonstatic_byte_space_offset;
3427 nonstatic_byte_space_offset += 1;
3428 nonstatic_byte_space_count -= 1;
3429 } else {
3430 real_offset = next_nonstatic_byte_offset;
3431 next_nonstatic_byte_offset += 1;
3432 }
3433 break;
3434 case NONSTATIC_SHORT:
3435 if( nonstatic_short_space_count > 0 ) {
3436 real_offset = nonstatic_short_space_offset;
3437 nonstatic_short_space_offset += BytesPerShort;
3438 nonstatic_short_space_count -= 1;
3439 } else {
3440 real_offset = next_nonstatic_short_offset;
3441 next_nonstatic_short_offset += BytesPerShort;
3442 }
3443 break;
3444 case NONSTATIC_WORD:
3445 if( nonstatic_word_space_count > 0 ) {
3446 real_offset = nonstatic_word_space_offset;
3447 nonstatic_word_space_offset += BytesPerInt;
3448 nonstatic_word_space_count -= 1;
3449 } else {
3450 real_offset = next_nonstatic_word_offset;
3451 next_nonstatic_word_offset += BytesPerInt;
3452 }
3453 break;
3454 case NONSTATIC_DOUBLE:
3455 real_offset = next_nonstatic_double_offset;
3456 next_nonstatic_double_offset += BytesPerLong;
3457 break;
3458 default:
3459 ShouldNotReachHere();
3460 }
3461 fs.set_offset(real_offset);
3462 }
3463
3464
3465 // Handle the contended cases.
3466 //
3467 // Each contended field should not intersect the cache line with another contended field.
3468 // In the absence of alignment information, we end up with pessimistically separating
3469 // the fields with full-width padding.
3470 //
3471 // Additionally, this should not break alignment for the fields, so we round the alignment up
3472 // for each field.
3473 if (contended_count > 0) {
3474
3475 // if there is at least one contended field, we need to have pre-padding for them
3476 if (nonstatic_contended_count > 0) {
3477 next_nonstatic_padded_offset += pad_size;
3478 }
3479
3480 // collect all contended groups
3481 BitMap bm(_cp->size());
3482 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3483 // skip already laid out fields
3484 if (fs.is_offset_set()) continue;
3485
3486 if (fs.is_contended()) {
3487 bm.set_bit(fs.contended_group());
3488 }
3489 }
3490
3491 int current_group = -1;
3492 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3493
3494 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3495
3496 // skip already laid out fields
3497 if (fs.is_offset_set()) continue;
3498
3499 // skip non-contended fields and fields from different group
3500 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3501
3502 // handle statics below
3503 if (fs.access_flags().is_static()) continue;
3504
3505 int real_offset;
3506 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3507
3508 switch (atype) {
3509 case NONSTATIC_BYTE:
3510 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3511 real_offset = next_nonstatic_padded_offset;
3512 next_nonstatic_padded_offset += 1;
3513 break;
3514
3515 case NONSTATIC_SHORT:
3516 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3517 real_offset = next_nonstatic_padded_offset;
3518 next_nonstatic_padded_offset += BytesPerShort;
3519 break;
3520
3521 case NONSTATIC_WORD:
3522 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3523 real_offset = next_nonstatic_padded_offset;
3524 next_nonstatic_padded_offset += BytesPerInt;
3525 break;
3526
3527 case NONSTATIC_DOUBLE:
3528 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3529 real_offset = next_nonstatic_padded_offset;
3530 next_nonstatic_padded_offset += BytesPerLong;
3531 break;
3532
3533 case NONSTATIC_OOP:
3534 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3535 real_offset = next_nonstatic_padded_offset;
3536 next_nonstatic_padded_offset += heapOopSize;
3537
3538 // Create new oop map
3539 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3540 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3541 nonstatic_oop_map_count += 1;
3542 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3543 first_nonstatic_oop_offset = real_offset;
3544 }
3545 break;
3546
3547 default:
3548 ShouldNotReachHere();
3549 }
3550
3551 if (fs.contended_group() == 0) {
3552 // Contended group defines the equivalence class over the fields:
3553 // the fields within the same contended group are not inter-padded.
3554 // The only exception is default group, which does not incur the
3555 // equivalence, and so requires intra-padding.
3556 next_nonstatic_padded_offset += pad_size;
3557 }
3558
3559 fs.set_offset(real_offset);
3560 } // for
3561
3562 // Start laying out the next group.
3563 // Note that this will effectively pad the last group in the back;
3564 // this is expected to alleviate memory contention effects for
3565 // subclass fields and/or adjacent object.
3566 // If this was the default group, the padding is already in place.
3567 if (current_group != 0) {
3568 next_nonstatic_padded_offset += pad_size;
3569 }
3570 }
3571
3572 // handle static fields
3573 }
3574
3575 // Size of instances
3576 int notaligned_offset = next_nonstatic_padded_offset;
3577
3578 // Entire class is contended, pad in the back.
3579 // This helps to alleviate memory contention effects for subclass fields
3580 // and/or adjacent object.
3581 if (parsed_annotations->is_contended()) {
3582 notaligned_offset += pad_size;
3583 }
3584
3585 int next_static_type_offset = align_size_up(next_static_byte_offset, wordSize);
3586 int static_field_size = (next_static_type_offset -
3587 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3588
3589 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3590 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3591 - first_nonstatic_field_offset)/heapOopSize);
3592
3593 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3594 int instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3595
3596 assert(instance_size == align_object_size(align_size_up(
3597 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations->is_contended()) ? pad_size : 0)),
3598 wordSize) / wordSize), "consistent layout helper value");
3599
3600 // Number of non-static oop map blocks allocated at end of klass.
3601 const unsigned int total_oop_map_count =
3602 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3603 first_nonstatic_oop_offset);
3604
3605 #ifndef PRODUCT
3606 if( PrintCompactFieldsSavings ) {
3607 ResourceMark rm;
3608 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3609 tty->print("[Saved %d of %d bytes in %s]\n",
3610 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3611 orig_nonstatic_field_size*heapOopSize,
3612 _class_name);
3613 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3614 tty->print("[Wasted %d over %d bytes in %s]\n",
3615 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3616 orig_nonstatic_field_size*heapOopSize,
3617 _class_name);
3618 }
3619 }
3620
3621 if (PrintFieldLayout) {
3622 print_field_layout(_class_name,
3623 _fields,
3624 _cp,
3625 instance_size,
3626 first_nonstatic_field_offset,
3627 next_nonstatic_field_offset,
3628 next_static_type_offset);
3629 }
3630
3631 #endif
3632 // Pass back information needed for InstanceKlass creation
3633 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3634 info->nonstatic_oop_counts = nonstatic_oop_counts;
3635 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3636 info->total_oop_map_count = total_oop_map_count;
3637 info->instance_size = instance_size;
3638 info->static_field_size = static_field_size;
3639 info->nonstatic_field_size = nonstatic_field_size;
3640 info->has_nonstatic_fields = has_nonstatic_fields;
3641 }
3642
3643
3644 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3645 ClassLoaderData* loader_data,
3646 Handle protection_domain,
3647 KlassHandle host_klass,
3648 GrowableArray<Handle>* cp_patches,
3649 TempNewSymbol& parsed_name,
3650 bool verify,
3651 TRAPS) {
3652
3653 // When a retransformable agent is attached, JVMTI caches the
3654 // class bytes that existed before the first retransformation.
3655 // If RedefineClasses() was used before the retransformable
3656 // agent attached, then the cached class bytes may not be the
3657 // original class bytes.
3658 unsigned char *cached_class_file_bytes = NULL;
3659 jint cached_class_file_length;
3660 Handle class_loader(THREAD, loader_data->class_loader());
3661 bool has_default_methods = false;
3662 ResourceMark rm(THREAD);
3663
3664 ClassFileStream* cfs = stream();
3665 // Timing
3666 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3667 JavaThread* jt = (JavaThread*) THREAD;
3668
3669 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3670 ClassLoader::perf_class_parse_selftime(),
3671 NULL,
3672 jt->get_thread_stat()->perf_recursion_counts_addr(),
3673 jt->get_thread_stat()->perf_timers_addr(),
3674 PerfClassTraceTime::PARSE_CLASS);
3675
3676 init_parsed_class_attributes(loader_data);
3677
3678 if (JvmtiExport::should_post_class_file_load_hook()) {
3679 // Get the cached class file bytes (if any) from the class that
3680 // is being redefined or retransformed. We use jvmti_thread_state()
3681 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3682 // a JvmtiThreadState any earlier than necessary. This will help
3683 // avoid the bug described by 7126851.
3684 JvmtiThreadState *state = jt->jvmti_thread_state();
3685 if (state != NULL) {
3686 KlassHandle *h_class_being_redefined =
3687 state->get_class_being_redefined();
3688 if (h_class_being_redefined != NULL) {
3689 instanceKlassHandle ikh_class_being_redefined =
3690 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3691 cached_class_file_bytes =
3692 ikh_class_being_redefined->get_cached_class_file_bytes();
3693 cached_class_file_length =
3694 ikh_class_being_redefined->get_cached_class_file_len();
3695 }
3696 }
3697
3698 unsigned char* ptr = cfs->buffer();
3699 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3700
3701 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3702 &ptr, &end_ptr,
3703 &cached_class_file_bytes,
3704 &cached_class_file_length);
3705
3706 if (ptr != cfs->buffer()) {
3707 // JVMTI agent has modified class file data.
3708 // Set new class file stream using JVMTI agent modified
3709 // class file data.
3710 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3711 set_stream(cfs);
3712 }
3713 }
3714
3715 _host_klass = host_klass;
3716 _cp_patches = cp_patches;
3717
3718 instanceKlassHandle nullHandle;
3719
3720 // Figure out whether we can skip format checking (matching classic VM behavior)
3721 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3722
3723 // Set the verify flag in stream
3724 cfs->set_verify(_need_verify);
3725
3726 // Save the class file name for easier error message printing.
3727 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3728
3729 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3730 // Magic value
3731 u4 magic = cfs->get_u4_fast();
3732 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3733 "Incompatible magic value %u in class file %s",
3734 magic, CHECK_(nullHandle));
3735
3736 // Version numbers
3737 u2 minor_version = cfs->get_u2_fast();
3738 u2 major_version = cfs->get_u2_fast();
3739
3740 // Check version numbers - we check this even with verifier off
3741 if (!is_supported_version(major_version, minor_version)) {
3742 if (name == NULL) {
3743 Exceptions::fthrow(
3744 THREAD_AND_LOCATION,
3745 vmSymbols::java_lang_UnsupportedClassVersionError(),
3746 "Unsupported major.minor version %u.%u",
3747 major_version,
3748 minor_version);
3749 } else {
3750 ResourceMark rm(THREAD);
3751 Exceptions::fthrow(
3752 THREAD_AND_LOCATION,
3753 vmSymbols::java_lang_UnsupportedClassVersionError(),
3754 "%s : Unsupported major.minor version %u.%u",
3755 name->as_C_string(),
3756 major_version,
3757 minor_version);
3758 }
3759 return nullHandle;
3760 }
3761
3762 _major_version = major_version;
3763 _minor_version = minor_version;
3764
3765
3766 // Check if verification needs to be relaxed for this class file
3767 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3768 _relax_verify = Verifier::relax_verify_for(class_loader());
3769
3770 // Constant pool
3771 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3772
3773 int cp_size = cp->length();
3774
3775 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3776
3777 // Access flags
3778 AccessFlags access_flags;
3779 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3780
3781 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3782 // Set abstract bit for old class files for backward compatibility
3783 flags |= JVM_ACC_ABSTRACT;
3784 }
3785 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3786 access_flags.set_flags(flags);
3787
3788 // This class and superclass
3789 u2 this_class_index = cfs->get_u2_fast();
3790 check_property(
3791 valid_cp_range(this_class_index, cp_size) &&
3792 cp->tag_at(this_class_index).is_unresolved_klass(),
3793 "Invalid this class index %u in constant pool in class file %s",
3794 this_class_index, CHECK_(nullHandle));
3795
3796 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3797 assert(class_name != NULL, "class_name can't be null");
3798
3799 // It's important to set parsed_name *before* resolving the super class.
3800 // (it's used for cleanup by the caller if parsing fails)
3801 parsed_name = class_name;
3802 // parsed_name is returned and can be used if there's an error, so add to
3803 // its reference count. Caller will decrement the refcount.
3804 parsed_name->increment_refcount();
3805
3806 // Update _class_name which could be null previously to be class_name
3807 _class_name = class_name;
3808
3809 // Don't need to check whether this class name is legal or not.
3810 // It has been checked when constant pool is parsed.
3811 // However, make sure it is not an array type.
3812 if (_need_verify) {
3813 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3814 "Bad class name in class file %s",
3815 CHECK_(nullHandle));
3816 }
3817
3818 Klass* preserve_this_klass; // for storing result across HandleMark
3819
3820 // release all handles when parsing is done
3821 { HandleMark hm(THREAD);
3822
3823 // Checks if name in class file matches requested name
3824 if (name != NULL && class_name != name) {
3825 ResourceMark rm(THREAD);
3826 Exceptions::fthrow(
3827 THREAD_AND_LOCATION,
3828 vmSymbols::java_lang_NoClassDefFoundError(),
3829 "%s (wrong name: %s)",
3830 name->as_C_string(),
3831 class_name->as_C_string()
3832 );
3833 return nullHandle;
3834 }
3835
3836 if (TraceClassLoadingPreorder) {
3837 tty->print("[Loading %s", name->as_klass_external_name());
3838 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3839 tty->print_cr("]");
3840 }
3841
3842 u2 super_class_index = cfs->get_u2_fast();
3843 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3844 CHECK_NULL);
3845
3846 // Interfaces
3847 u2 itfs_len = cfs->get_u2_fast();
3848 Array<Klass*>* local_interfaces =
3849 parse_interfaces(itfs_len, protection_domain, _class_name,
3850 &has_default_methods, CHECK_(nullHandle));
3851
3852 u2 java_fields_count = 0;
3853 // Fields (offsets are filled in later)
3854 FieldAllocationCount fac;
3855 Array<u2>* fields = parse_fields(class_name,
3856 access_flags.is_interface(),
3857 &fac, &java_fields_count,
3858 CHECK_(nullHandle));
3859 // Methods
3860 bool has_final_method = false;
3861 AccessFlags promoted_flags;
3862 promoted_flags.set_flags(0);
3863 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3864 &promoted_flags,
3865 &has_final_method,
3866 &has_default_methods,
3867 CHECK_(nullHandle));
3868
3869 // Additional attributes
3870 ClassAnnotationCollector parsed_annotations;
3871 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3872
3873 // Make sure this is the end of class file stream
3874 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3875
3876 // We check super class after class file is parsed and format is checked
3877 if (super_class_index > 0 && super_klass.is_null()) {
3878 Symbol* sk = cp->klass_name_at(super_class_index);
3879 if (access_flags.is_interface()) {
3880 // Before attempting to resolve the superclass, check for class format
3881 // errors not checked yet.
3882 guarantee_property(sk == vmSymbols::java_lang_Object(),
3883 "Interfaces must have java.lang.Object as superclass in class file %s",
3884 CHECK_(nullHandle));
3885 }
3886 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3887 class_loader,
3888 protection_domain,
3889 true,
3890 CHECK_(nullHandle));
3891
3892 KlassHandle kh (THREAD, k);
3893 super_klass = instanceKlassHandle(THREAD, kh());
3894 }
3895 if (super_klass.not_null()) {
3896
3897 if (super_klass->has_default_methods()) {
3898 has_default_methods = true;
3899 }
3900
3901 if (super_klass->is_interface()) {
3902 ResourceMark rm(THREAD);
3903 Exceptions::fthrow(
3904 THREAD_AND_LOCATION,
3905 vmSymbols::java_lang_IncompatibleClassChangeError(),
3906 "class %s has interface %s as super class",
3907 class_name->as_klass_external_name(),
3908 super_klass->external_name()
3909 );
3910 return nullHandle;
3911 }
3912 // Make sure super class is not final
3913 if (super_klass->is_final()) {
3914 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3915 }
3916 }
3917
3918 // save super klass for error handling.
3919 _super_klass = super_klass;
3920
3921 // Compute the transitive list of all unique interfaces implemented by this class
3922 _transitive_interfaces =
3923 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3924
3925 // sort methods
3926 intArray* method_ordering = sort_methods(methods);
3927
3928 // promote flags from parse_methods() to the klass' flags
3929 access_flags.add_promoted_flags(promoted_flags.as_int());
3930
3931 // Size of Java vtable (in words)
3932 int vtable_size = 0;
3933 int itable_size = 0;
3934 int num_miranda_methods = 0;
3935
3936 GrowableArray<Method*> all_mirandas(20);
3937
3938 klassVtable::compute_vtable_size_and_num_mirandas(
3939 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3940 access_flags, class_loader, class_name, local_interfaces,
3941 CHECK_(nullHandle));
3942
3943 // Size of Java itable (in words)
3944 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3945
3946 FieldLayoutInfo info;
3947 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3948
3949 int total_oop_map_size2 =
3950 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3951
3952 // Compute reference type
3953 ReferenceType rt;
3954 if (super_klass() == NULL) {
3955 rt = REF_NONE;
3956 } else {
3957 rt = super_klass->reference_type();
3958 }
3959
3960 // We can now create the basic Klass* for this klass
3961 _klass = InstanceKlass::allocate_instance_klass(loader_data,
3962 vtable_size,
3963 itable_size,
3964 info.static_field_size,
3965 total_oop_map_size2,
3966 rt,
3967 access_flags,
3968 name,
3969 super_klass(),
3970 !host_klass.is_null(),
3971 CHECK_(nullHandle));
3972 instanceKlassHandle this_klass (THREAD, _klass);
3973
3974 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
3975 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
3976 "sanity");
3977
3978 // Fill in information already parsed
3979 this_klass->set_should_verify_class(verify);
3980 jint lh = Klass::instance_layout_helper(info.instance_size, false);
3981 this_klass->set_layout_helper(lh);
3982 assert(this_klass->oop_is_instance(), "layout is correct");
3983 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
3984 // Not yet: supers are done below to support the new subtype-checking fields
3985 //this_klass->set_super(super_klass());
3986 this_klass->set_class_loader_data(loader_data);
3987 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
3988 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
3989 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3990
3991 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
3992
3993 if (has_final_method) {
3994 this_klass->set_has_final_method();
3995 }
3996 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
3997 // The InstanceKlass::_methods_jmethod_ids cache and the
3998 // InstanceKlass::_methods_cached_itable_indices cache are
3999 // both managed on the assumption that the initial cache
4000 // size is equal to the number of methods in the class. If
4001 // that changes, then InstanceKlass::idnum_can_increment()
4002 // has to be changed accordingly.
4003 this_klass->set_initial_method_idnum(methods->length());
4004 this_klass->set_name(cp->klass_name_at(this_class_index));
4005 if (is_anonymous()) // I am well known to myself
4006 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4007
4008 this_klass->set_minor_version(minor_version);
4009 this_klass->set_major_version(major_version);
4010 this_klass->set_has_default_methods(has_default_methods);
4011
4012 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4013 // (We used to do this lazily, but now we query it in Rewriter,
4014 // which is eagerly done for every method, so we might as well do it now,
4015 // when everything is fresh in memory.)
4016 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4017 for (int j = 0; j < methods->length(); j++) {
4018 methods->at(j)->init_intrinsic_id();
4019 }
4020 }
4021
4022 if (cached_class_file_bytes != NULL) {
4023 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4024 this_klass->set_cached_class_file(cached_class_file_bytes,
4025 cached_class_file_length);
4026 }
4027
4028 // Fill in field values obtained by parse_classfile_attributes
4029 if (parsed_annotations.has_any_annotations())
4030 parsed_annotations.apply_to(this_klass);
4031 apply_parsed_class_attributes(this_klass);
4032
4033 // Miranda methods
4034 if ((num_miranda_methods > 0) ||
4035 // if this class introduced new miranda methods or
4036 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4037 // super class exists and this class inherited miranda methods
4038 ) {
4039 this_klass->set_has_miranda_methods(); // then set a flag
4040 }
4041
4042 // Fill in information needed to compute superclasses.
4043 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4044
4045 // Initialize itable offset tables
4046 klassItable::setup_itable_offset_table(this_klass);
4047
4048 // Compute transitive closure of interfaces this class implements
4049 // Do final class setup
4050 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4051
4052 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4053 set_precomputed_flags(this_klass);
4054
4055 // reinitialize modifiers, using the InnerClasses attribute
4056 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4057 this_klass->set_modifier_flags(computed_modifiers);
4058
4059 // check if this class can access its super class
4060 check_super_class_access(this_klass, CHECK_(nullHandle));
4061
4062 // check if this class can access its superinterfaces
4063 check_super_interface_access(this_klass, CHECK_(nullHandle));
4064
4065 // check if this class overrides any final method
4066 check_final_method_override(this_klass, CHECK_(nullHandle));
4067
4068 // check that if this class is an interface then it doesn't have static methods
4069 if (this_klass->is_interface()) {
4070 /* An interface in a JAVA 8 classfile can be static */
4071 if (_major_version < JAVA_8_VERSION) {
4072 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4073 }
4074 }
4075
4076
4077 #ifdef ASSERT
4078 if (ParseAllGenericSignatures) {
4079 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4080 }
4081 #endif
4082
4083 // Generate any default methods - default methods are interface methods
4084 // that have a default implementation. This is new with Lambda project.
4085 if (has_default_methods && !access_flags.is_interface() &&
4086 local_interfaces->length() > 0) {
4087 DefaultMethods::generate_default_methods(
4088 this_klass(), &all_mirandas, CHECK_(nullHandle));
4089 }
4090
4091 // Allocate mirror and initialize static fields
4092 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
4093
4094 // Allocate a simple java object for locking during class initialization.
4095 // This needs to be a java object because it can be held across a java call.
4096 typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
4097 this_klass->set_init_lock(r);
4098
4099 // TODO: Move these oops to the mirror
4100 this_klass->set_protection_domain(protection_domain());
4101
4102 // Update the loader_data graph.
4103 record_defined_class_dependencies(this_klass, CHECK_NULL);
4104
4105 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4106 false /* not shared class */);
4107
4108 if (TraceClassLoading) {
4109 ResourceMark rm;
4110 // print in a single call to reduce interleaving of output
4111 if (cfs->source() != NULL) {
4112 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4113 cfs->source());
4114 } else if (class_loader.is_null()) {
4115 if (THREAD->is_Java_thread()) {
4116 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4117 tty->print("[Loaded %s by instance of %s]\n",
4118 this_klass->external_name(),
4119 InstanceKlass::cast(caller)->external_name());
4120 } else {
4121 tty->print("[Loaded %s]\n", this_klass->external_name());
4122 }
4123 } else {
4124 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4125 InstanceKlass::cast(class_loader->klass())->external_name());
4126 }
4127 }
4128
4129 if (TraceClassResolution) {
4130 ResourceMark rm;
4131 // print out the superclass.
4132 const char * from = this_klass()->external_name();
4133 if (this_klass->java_super() != NULL) {
4134 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4135 }
4136 // print out each of the interface classes referred to by this class.
4137 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4138 if (local_interfaces != NULL) {
4139 int length = local_interfaces->length();
4140 for (int i = 0; i < length; i++) {
4141 Klass* k = local_interfaces->at(i);
4142 InstanceKlass* to_class = InstanceKlass::cast(k);
4143 const char * to = to_class->external_name();
4144 tty->print("RESOLVE %s %s (interface)\n", from, to);
4145 }
4146 }
4147 }
4148
4149 // preserve result across HandleMark
4150 preserve_this_klass = this_klass();
4151 }
4152
4153 // Create new handle outside HandleMark (might be needed for
4154 // Extended Class Redefinition)
4155 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4156 debug_only(this_klass->verify();)
4157
4158 // Clear class if no error has occurred so destructor doesn't deallocate it
4159 _klass = NULL;
4160 return this_klass;
4161 }
4162
4163 // Destructor to clean up if there's an error
4164 ClassFileParser::~ClassFileParser() {
4165 MetadataFactory::free_metadata(_loader_data, _cp);
4166 MetadataFactory::free_array<u2>(_loader_data, _fields);
4167
4168 // Free methods
4169 InstanceKlass::deallocate_methods(_loader_data, _methods);
4170
4171 // beware of the Universe::empty_blah_array!!
4172 if (_inner_classes != Universe::the_empty_short_array()) {
4173 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4174 }
4175
4176 // Free interfaces
4177 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4178 _local_interfaces, _transitive_interfaces);
4179
4180 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4181 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4182 Annotations::free_contents(_loader_data, _fields_annotations);
4183 Annotations::free_contents(_loader_data, _fields_type_annotations);
4184
4185 clear_class_metadata();
4186
4187 // deallocate the klass if already created.
4188 MetadataFactory::free_metadata(_loader_data, _klass);
4189 _klass = NULL;
4190 }
4191
4192 void ClassFileParser::print_field_layout(Symbol* name,
4193 Array<u2>* fields,
4194 constantPoolHandle cp,
4195 int instance_size,
4196 int instance_fields_start,
4197 int instance_fields_end,
4198 int static_fields_end) {
4199 tty->print("%s: field layout\n", name->as_klass_external_name());
4200 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4201 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4202 if (!fs.access_flags().is_static()) {
4203 tty->print(" @%3d \"%s\" %s\n",
4204 fs.offset(),
4205 fs.name()->as_klass_external_name(),
4206 fs.signature()->as_klass_external_name());
4207 }
4208 }
4209 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4210 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4211 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4212 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4213 if (fs.access_flags().is_static()) {
4214 tty->print(" @%3d \"%s\" %s\n",
4215 fs.offset(),
4216 fs.name()->as_klass_external_name(),
4217 fs.signature()->as_klass_external_name());
4218 }
4219 }
4220 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4221 tty->print("\n");
4222 }
4223
4224 unsigned int
4225 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4226 unsigned int nonstatic_oop_map_count,
4227 int first_nonstatic_oop_offset) {
4228 unsigned int map_count =
4229 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4230 if (nonstatic_oop_map_count > 0) {
4231 // We have oops to add to map
4232 if (map_count == 0) {
4233 map_count = nonstatic_oop_map_count;
4234 } else {
4235 // Check whether we should add a new map block or whether the last one can
4236 // be extended
4237 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4238 OopMapBlock* const last_map = first_map + map_count - 1;
4239
4240 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4241 if (next_offset == first_nonstatic_oop_offset) {
4242 // There is no gap bettwen superklass's last oop field and first
4243 // local oop field, merge maps.
4244 nonstatic_oop_map_count -= 1;
4245 } else {
4246 // Superklass didn't end with a oop field, add extra maps
4247 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4248 }
4249 map_count += nonstatic_oop_map_count;
4250 }
4251 }
4252 return map_count;
4253 }
4254
4255
4256 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4257 unsigned int nonstatic_oop_map_count,
4258 int* nonstatic_oop_offsets,
4259 unsigned int* nonstatic_oop_counts) {
4260 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4261 const InstanceKlass* const super = k->superklass();
4262 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4263 if (super_count > 0) {
4264 // Copy maps from superklass
4265 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4266 for (unsigned int i = 0; i < super_count; ++i) {
4267 *this_oop_map++ = *super_oop_map++;
4268 }
4269 }
4270
4271 if (nonstatic_oop_map_count > 0) {
4272 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4273 // The counts differ because there is no gap between superklass's last oop
4274 // field and the first local oop field. Extend the last oop map copied
4275 // from the superklass instead of creating new one.
4276 nonstatic_oop_map_count--;
4277 nonstatic_oop_offsets++;
4278 this_oop_map--;
4279 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4280 this_oop_map++;
4281 }
4282
4283 // Add new map blocks, fill them
4284 while (nonstatic_oop_map_count-- > 0) {
4285 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4286 this_oop_map->set_count(*nonstatic_oop_counts++);
4287 this_oop_map++;
4288 }
4289 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4290 this_oop_map, "sanity");
4291 }
4292 }
4293
4294
4295 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4296 Klass* super = k->super();
4297
4298 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4299 // in which case we don't have to register objects as finalizable
4300 if (!_has_empty_finalizer) {
4301 if (_has_finalizer ||
4302 (super != NULL && super->has_finalizer())) {
4303 k->set_has_finalizer();
4304 }
4305 }
4306
4307 #ifdef ASSERT
4308 bool f = false;
4309 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4310 vmSymbols::void_method_signature());
4311 if (m != NULL && !m->is_empty_method()) {
4312 f = true;
4313 }
4314 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4315 #endif
4316
4317 // Check if this klass supports the java.lang.Cloneable interface
4318 if (SystemDictionary::Cloneable_klass_loaded()) {
4319 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4320 k->set_is_cloneable();
4321 }
4322 }
4323
4324 // Check if this klass has a vanilla default constructor
4325 if (super == NULL) {
4326 // java.lang.Object has empty default constructor
4327 k->set_has_vanilla_constructor();
4328 } else {
4329 if (super->has_vanilla_constructor() &&
4330 _has_vanilla_constructor) {
4331 k->set_has_vanilla_constructor();
4332 }
4333 #ifdef ASSERT
4334 bool v = false;
4335 if (super->has_vanilla_constructor()) {
4336 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4337 ), vmSymbols::void_method_signature());
4338 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4339 v = true;
4340 }
4341 }
4342 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4343 #endif
4344 }
4345
4346 // If it cannot be fast-path allocated, set a bit in the layout helper.
4347 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4348 assert(k->size_helper() > 0, "layout_helper is initialized");
4349 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4350 || k->is_abstract() || k->is_interface()
4351 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4352 || k->size_helper() >= FastAllocateSizeLimit) {
4353 // Forbid fast-path allocation.
4354 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4355 k->set_layout_helper(lh);
4356 }
4357 }
4358
4359 // Attach super classes and interface classes to class loader data
4360 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4361 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4362 if (defining_loader_data->is_the_null_class_loader_data()) {
4363 // Dependencies to null class loader data are implicit.
4364 return;
4365 } else {
4366 // add super class dependency
4367 Klass* super = defined_klass->super();
4368 if (super != NULL) {
4369 defining_loader_data->record_dependency(super, CHECK);
4370 }
4371
4372 // add super interface dependencies
4373 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4374 if (local_interfaces != NULL) {
4375 int length = local_interfaces->length();
4376 for (int i = 0; i < length; i++) {
4377 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4378 }
4379 }
4380 }
4381 }
4382
4383 // utility methods for appending an array with check for duplicates
4384
4385 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4386 // iterate over new interfaces
4387 for (int i = 0; i < ifs->length(); i++) {
4388 Klass* e = ifs->at(i);
4389 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4390 // add new interface
4391 result->append_if_missing(e);
4392 }
4393 }
4394
4395 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4396 instanceKlassHandle super,
4397 Array<Klass*>* local_ifs, TRAPS) {
4398 // Compute maximum size for transitive interfaces
4399 int max_transitive_size = 0;
4400 int super_size = 0;
4401 // Add superclass transitive interfaces size
4402 if (super.not_null()) {
4403 super_size = super->transitive_interfaces()->length();
4404 max_transitive_size += super_size;
4405 }
4406 // Add local interfaces' super interfaces
4407 int local_size = local_ifs->length();
4408 for (int i = 0; i < local_size; i++) {
4409 Klass* l = local_ifs->at(i);
4410 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4411 }
4412 // Finally add local interfaces
4413 max_transitive_size += local_size;
4414 // Construct array
4415 if (max_transitive_size == 0) {
4416 // no interfaces, use canonicalized array
4417 return Universe::the_empty_klass_array();
4418 } else if (max_transitive_size == super_size) {
4419 // no new local interfaces added, share superklass' transitive interface array
4420 return super->transitive_interfaces();
4421 } else if (max_transitive_size == local_size) {
4422 // only local interfaces added, share local interface array
4423 return local_ifs;
4424 } else {
4425 ResourceMark rm;
4426 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4427
4428 // Copy down from superclass
4429 if (super.not_null()) {
4430 append_interfaces(result, super->transitive_interfaces());
4431 }
4432
4433 // Copy down from local interfaces' superinterfaces
4434 for (int i = 0; i < local_ifs->length(); i++) {
4435 Klass* l = local_ifs->at(i);
4436 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4437 }
4438 // Finally add local interfaces
4439 append_interfaces(result, local_ifs);
4440
4441 // length will be less than the max_transitive_size if duplicates were removed
4442 int length = result->length();
4443 assert(length <= max_transitive_size, "just checking");
4444 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4445 for (int i = 0; i < length; i++) {
4446 Klass* e = result->at(i);
4447 assert(e != NULL, "just checking");
4448 new_result->at_put(i, e);
4449 }
4450 return new_result;
4451 }
4452 }
4453
4454 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4455 Klass* super = this_klass->super();
4456 if ((super != NULL) &&
4457 (!Reflection::verify_class_access(this_klass(), super, false))) {
4458 ResourceMark rm(THREAD);
4459 Exceptions::fthrow(
4460 THREAD_AND_LOCATION,
4461 vmSymbols::java_lang_IllegalAccessError(),
4462 "class %s cannot access its superclass %s",
4463 this_klass->external_name(),
4464 InstanceKlass::cast(super)->external_name()
4465 );
4466 return;
4467 }
4468 }
4469
4470
4471 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4472 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4473 int lng = local_interfaces->length();
4474 for (int i = lng - 1; i >= 0; i--) {
4475 Klass* k = local_interfaces->at(i);
4476 assert (k != NULL && k->is_interface(), "invalid interface");
4477 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4478 ResourceMark rm(THREAD);
4479 Exceptions::fthrow(
4480 THREAD_AND_LOCATION,
4481 vmSymbols::java_lang_IllegalAccessError(),
4482 "class %s cannot access its superinterface %s",
4483 this_klass->external_name(),
4484 InstanceKlass::cast(k)->external_name()
4485 );
4486 return;
4487 }
4488 }
4489 }
4490
4491
4492 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4493 Array<Method*>* methods = this_klass->methods();
4494 int num_methods = methods->length();
4495
4496 // go thru each method and check if it overrides a final method
4497 for (int index = 0; index < num_methods; index++) {
4498 Method* m = methods->at(index);
4499
4500 // skip private, static and <init> methods
4501 if ((!m->is_private()) &&
4502 (!m->is_static()) &&
4503 (m->name() != vmSymbols::object_initializer_name())) {
4504
4505 Symbol* name = m->name();
4506 Symbol* signature = m->signature();
4507 Klass* k = this_klass->super();
4508 Method* super_m = NULL;
4509 while (k != NULL) {
4510 // skip supers that don't have final methods.
4511 if (k->has_final_method()) {
4512 // lookup a matching method in the super class hierarchy
4513 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4514 if (super_m == NULL) {
4515 break; // didn't find any match; get out
4516 }
4517
4518 if (super_m->is_final() &&
4519 // matching method in super is final
4520 (Reflection::verify_field_access(this_klass(),
4521 super_m->method_holder(),
4522 super_m->method_holder(),
4523 super_m->access_flags(), false))
4524 // this class can access super final method and therefore override
4525 ) {
4526 ResourceMark rm(THREAD);
4527 Exceptions::fthrow(
4528 THREAD_AND_LOCATION,
4529 vmSymbols::java_lang_VerifyError(),
4530 "class %s overrides final method %s.%s",
4531 this_klass->external_name(),
4532 name->as_C_string(),
4533 signature->as_C_string()
4534 );
4535 return;
4536 }
4537
4538 // continue to look from super_m's holder's super.
4539 k = super_m->method_holder()->super();
4540 continue;
4541 }
4542
4543 k = k->super();
4544 }
4545 }
4546 }
4547 }
4548
4549
4550 // assumes that this_klass is an interface
4551 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4552 assert(this_klass->is_interface(), "not an interface");
4553 Array<Method*>* methods = this_klass->methods();
4554 int num_methods = methods->length();
4555
4556 for (int index = 0; index < num_methods; index++) {
4557 Method* m = methods->at(index);
4558 // if m is static and not the init method, throw a verify error
4559 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4560 ResourceMark rm(THREAD);
4561 Exceptions::fthrow(
4562 THREAD_AND_LOCATION,
4563 vmSymbols::java_lang_VerifyError(),
4564 "Illegal static method %s in interface %s",
4565 m->name()->as_C_string(),
4566 this_klass->external_name()
4567 );
4568 return;
4569 }
4570 }
4571 }
4572
4573 // utility methods for format checking
4574
4575 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4576 if (!_need_verify) { return; }
4577
4578 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4579 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4580 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4581 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4582 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4583 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4584 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4585
4586 if ((is_abstract && is_final) ||
4587 (is_interface && !is_abstract) ||
4588 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4589 (!is_interface && major_gte_15 && is_annotation)) {
4590 ResourceMark rm(THREAD);
4591 Exceptions::fthrow(
4592 THREAD_AND_LOCATION,
4593 vmSymbols::java_lang_ClassFormatError(),
4594 "Illegal class modifiers in class %s: 0x%X",
4595 _class_name->as_C_string(), flags
4596 );
4597 return;
4598 }
4599 }
4600
4601 bool ClassFileParser::has_illegal_visibility(jint flags) {
4602 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4603 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4604 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4605
4606 return ((is_public && is_protected) ||
4607 (is_public && is_private) ||
4608 (is_protected && is_private));
4609 }
4610
4611 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4612 u2 max_version =
4613 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4614 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4615 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4616 (major <= max_version) &&
4617 ((major != max_version) ||
4618 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4619 }
4620
4621 void ClassFileParser::verify_legal_field_modifiers(
4622 jint flags, bool is_interface, TRAPS) {
4623 if (!_need_verify) { return; }
4624
4625 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4626 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4627 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4628 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4629 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4630 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4631 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4632 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4633 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4634
4635 bool is_illegal = false;
4636
4637 if (is_interface) {
4638 if (!is_public || !is_static || !is_final || is_private ||
4639 is_protected || is_volatile || is_transient ||
4640 (major_gte_15 && is_enum)) {
4641 is_illegal = true;
4642 }
4643 } else { // not interface
4644 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4645 is_illegal = true;
4646 }
4647 }
4648
4649 if (is_illegal) {
4650 ResourceMark rm(THREAD);
4651 Exceptions::fthrow(
4652 THREAD_AND_LOCATION,
4653 vmSymbols::java_lang_ClassFormatError(),
4654 "Illegal field modifiers in class %s: 0x%X",
4655 _class_name->as_C_string(), flags);
4656 return;
4657 }
4658 }
4659
4660 void ClassFileParser::verify_legal_method_modifiers(
4661 jint flags, bool is_interface, Symbol* name, TRAPS) {
4662 if (!_need_verify) { return; }
4663
4664 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4665 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4666 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4667 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4668 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4669 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4670 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4671 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4672 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4673 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4674 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4675 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4676 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4677
4678 bool is_illegal = false;
4679
4680 if (is_interface) {
4681 if (major_gte_8) {
4682 // Class file version is JAVA_8_VERSION or later Methods of
4683 // interfaces may set any of the flags except ACC_PROTECTED,
4684 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4685 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4686 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4687 (is_native || is_protected || is_final || is_synchronized) ||
4688 // If a specific method of a class or interface has its
4689 // ACC_ABSTRACT flag set, it must not have any of its
4690 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4691 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4692 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4693 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4694 (is_abstract && (is_private || is_static || is_strict))) {
4695 is_illegal = true;
4696 }
4697 } else if (major_gte_15) {
4698 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4699 if (!is_public || is_static || is_final || is_synchronized ||
4700 is_native || !is_abstract || is_strict) {
4701 is_illegal = true;
4702 }
4703 } else {
4704 // Class file version is pre-JAVA_1_5_VERSION
4705 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4706 is_illegal = true;
4707 }
4708 }
4709 } else { // not interface
4710 if (is_initializer) {
4711 if (is_static || is_final || is_synchronized || is_native ||
4712 is_abstract || (major_gte_15 && is_bridge)) {
4713 is_illegal = true;
4714 }
4715 } else { // not initializer
4716 if (is_abstract) {
4717 if ((is_final || is_native || is_private || is_static ||
4718 (major_gte_15 && (is_synchronized || is_strict)))) {
4719 is_illegal = true;
4720 }
4721 }
4722 if (has_illegal_visibility(flags)) {
4723 is_illegal = true;
4724 }
4725 }
4726 }
4727
4728 if (is_illegal) {
4729 ResourceMark rm(THREAD);
4730 Exceptions::fthrow(
4731 THREAD_AND_LOCATION,
4732 vmSymbols::java_lang_ClassFormatError(),
4733 "Method %s in class %s has illegal modifiers: 0x%X",
4734 name->as_C_string(), _class_name->as_C_string(), flags);
4735 return;
4736 }
4737 }
4738
4739 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4740 assert(_need_verify, "only called when _need_verify is true");
4741 int i = 0;
4742 int count = length >> 2;
4743 for (int k=0; k<count; k++) {
4744 unsigned char b0 = buffer[i];
4745 unsigned char b1 = buffer[i+1];
4746 unsigned char b2 = buffer[i+2];
4747 unsigned char b3 = buffer[i+3];
4748 // For an unsigned char v,
4749 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4750 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4751 unsigned char res = b0 | b0 - 1 |
4752 b1 | b1 - 1 |
4753 b2 | b2 - 1 |
4754 b3 | b3 - 1;
4755 if (res >= 128) break;
4756 i += 4;
4757 }
4758 for(; i < length; i++) {
4759 unsigned short c;
4760 // no embedded zeros
4761 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4762 if(buffer[i] < 128) {
4763 continue;
4764 }
4765 if ((i + 5) < length) { // see if it's legal supplementary character
4766 if (UTF8::is_supplementary_character(&buffer[i])) {
4767 c = UTF8::get_supplementary_character(&buffer[i]);
4768 i += 5;
4769 continue;
4770 }
4771 }
4772 switch (buffer[i] >> 4) {
4773 default: break;
4774 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4775 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4776 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4777 c = (buffer[i] & 0x1F) << 6;
4778 i++;
4779 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4780 c += buffer[i] & 0x3F;
4781 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4782 // for classes with major > 47, c must a null or a character in its shortest form
4783 break;
4784 }
4785 }
4786 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4787 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4788 c = (buffer[i] & 0xF) << 12;
4789 i += 2;
4790 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4791 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4792 if (_major_version <= 47 || c >= 0x800) {
4793 // for classes with major > 47, c must be in its shortest form
4794 break;
4795 }
4796 }
4797 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4798 } // end of switch
4799 } // end of for
4800 }
4801
4802 // Checks if name is a legal class name.
4803 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4804 if (!_need_verify || _relax_verify) { return; }
4805
4806 char buf[fixed_buffer_size];
4807 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4808 unsigned int length = name->utf8_length();
4809 bool legal = false;
4810
4811 if (length > 0) {
4812 char* p;
4813 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4814 p = skip_over_field_signature(bytes, false, length, CHECK);
4815 legal = (p != NULL) && ((p - bytes) == (int)length);
4816 } else if (_major_version < JAVA_1_5_VERSION) {
4817 if (bytes[0] != '<') {
4818 p = skip_over_field_name(bytes, true, length);
4819 legal = (p != NULL) && ((p - bytes) == (int)length);
4820 }
4821 } else {
4822 // 4900761: relax the constraints based on JSR202 spec
4823 // Class names may be drawn from the entire Unicode character set.
4824 // Identifiers between '/' must be unqualified names.
4825 // The utf8 string has been verified when parsing cpool entries.
4826 legal = verify_unqualified_name(bytes, length, LegalClass);
4827 }
4828 }
4829 if (!legal) {
4830 ResourceMark rm(THREAD);
4831 Exceptions::fthrow(
4832 THREAD_AND_LOCATION,
4833 vmSymbols::java_lang_ClassFormatError(),
4834 "Illegal class name \"%s\" in class file %s", bytes,
4835 _class_name->as_C_string()
4836 );
4837 return;
4838 }
4839 }
4840
4841 // Checks if name is a legal field name.
4842 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4843 if (!_need_verify || _relax_verify) { return; }
4844
4845 char buf[fixed_buffer_size];
4846 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4847 unsigned int length = name->utf8_length();
4848 bool legal = false;
4849
4850 if (length > 0) {
4851 if (_major_version < JAVA_1_5_VERSION) {
4852 if (bytes[0] != '<') {
4853 char* p = skip_over_field_name(bytes, false, length);
4854 legal = (p != NULL) && ((p - bytes) == (int)length);
4855 }
4856 } else {
4857 // 4881221: relax the constraints based on JSR202 spec
4858 legal = verify_unqualified_name(bytes, length, LegalField);
4859 }
4860 }
4861
4862 if (!legal) {
4863 ResourceMark rm(THREAD);
4864 Exceptions::fthrow(
4865 THREAD_AND_LOCATION,
4866 vmSymbols::java_lang_ClassFormatError(),
4867 "Illegal field name \"%s\" in class %s", bytes,
4868 _class_name->as_C_string()
4869 );
4870 return;
4871 }
4872 }
4873
4874 // Checks if name is a legal method name.
4875 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4876 if (!_need_verify || _relax_verify) { return; }
4877
4878 assert(name != NULL, "method name is null");
4879 char buf[fixed_buffer_size];
4880 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4881 unsigned int length = name->utf8_length();
4882 bool legal = false;
4883
4884 if (length > 0) {
4885 if (bytes[0] == '<') {
4886 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4887 legal = true;
4888 }
4889 } else if (_major_version < JAVA_1_5_VERSION) {
4890 char* p;
4891 p = skip_over_field_name(bytes, false, length);
4892 legal = (p != NULL) && ((p - bytes) == (int)length);
4893 } else {
4894 // 4881221: relax the constraints based on JSR202 spec
4895 legal = verify_unqualified_name(bytes, length, LegalMethod);
4896 }
4897 }
4898
4899 if (!legal) {
4900 ResourceMark rm(THREAD);
4901 Exceptions::fthrow(
4902 THREAD_AND_LOCATION,
4903 vmSymbols::java_lang_ClassFormatError(),
4904 "Illegal method name \"%s\" in class %s", bytes,
4905 _class_name->as_C_string()
4906 );
4907 return;
4908 }
4909 }
4910
4911
4912 // Checks if signature is a legal field signature.
4913 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4914 if (!_need_verify) { return; }
4915
4916 char buf[fixed_buffer_size];
4917 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4918 unsigned int length = signature->utf8_length();
4919 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4920
4921 if (p == NULL || (p - bytes) != (int)length) {
4922 throwIllegalSignature("Field", name, signature, CHECK);
4923 }
4924 }
4925
4926 // Checks if signature is a legal method signature.
4927 // Returns number of parameters
4928 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4929 if (!_need_verify) {
4930 // make sure caller's args_size will be less than 0 even for non-static
4931 // method so it will be recomputed in compute_size_of_parameters().
4932 return -2;
4933 }
4934
4935 unsigned int args_size = 0;
4936 char buf[fixed_buffer_size];
4937 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4938 unsigned int length = signature->utf8_length();
4939 char* nextp;
4940
4941 // The first character must be a '('
4942 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4943 length--;
4944 // Skip over legal field signatures
4945 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4946 while ((length > 0) && (nextp != NULL)) {
4947 args_size++;
4948 if (p[0] == 'J' || p[0] == 'D') {
4949 args_size++;
4950 }
4951 length -= nextp - p;
4952 p = nextp;
4953 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4954 }
4955 // The first non-signature thing better be a ')'
4956 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4957 length--;
4958 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4959 // All internal methods must return void
4960 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4961 return args_size;
4962 }
4963 } else {
4964 // Now we better just have a return value
4965 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4966 if (nextp && ((int)length == (nextp - p))) {
4967 return args_size;
4968 }
4969 }
4970 }
4971 }
4972 // Report error
4973 throwIllegalSignature("Method", name, signature, CHECK_0);
4974 return 0;
4975 }
4976
4977
4978 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4979 // Method names also may not contain the characters '<' or '>', unless <init>
4980 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4981 // method. Because these names have been checked as special cases before
4982 // calling this method in verify_legal_method_name.
4983 bool ClassFileParser::verify_unqualified_name(
4984 char* name, unsigned int length, int type) {
4985 jchar ch;
4986
4987 for (char* p = name; p != name + length; ) {
4988 ch = *p;
4989 if (ch < 128) {
4990 p++;
4991 if (ch == '.' || ch == ';' || ch == '[' ) {
4992 return false; // do not permit '.', ';', or '['
4993 }
4994 if (type != LegalClass && ch == '/') {
4995 return false; // do not permit '/' unless it's class name
4996 }
4997 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4998 return false; // do not permit '<' or '>' in method names
4999 }
5000 } else {
5001 char* tmp_p = UTF8::next(p, &ch);
5002 p = tmp_p;
5003 }
5004 }
5005 return true;
5006 }
5007
5008
5009 // Take pointer to a string. Skip over the longest part of the string that could
5010 // be taken as a fieldname. Allow '/' if slash_ok is true.
5011 // Return a pointer to just past the fieldname.
5012 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5013 // being true, we saw consecutive slashes (meaning we were looking for a
5014 // qualified path but found something that was badly-formed).
5015 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5016 char* p;
5017 jchar ch;
5018 jboolean last_is_slash = false;
5019 jboolean not_first_ch = false;
5020
5021 for (p = name; p != name + length; not_first_ch = true) {
5022 char* old_p = p;
5023 ch = *p;
5024 if (ch < 128) {
5025 p++;
5026 // quick check for ascii
5027 if ((ch >= 'a' && ch <= 'z') ||
5028 (ch >= 'A' && ch <= 'Z') ||
5029 (ch == '_' || ch == '$') ||
5030 (not_first_ch && ch >= '0' && ch <= '9')) {
5031 last_is_slash = false;
5032 continue;
5033 }
5034 if (slash_ok && ch == '/') {
5035 if (last_is_slash) {
5036 return NULL; // Don't permit consecutive slashes
5037 }
5038 last_is_slash = true;
5039 continue;
5040 }
5041 } else {
5042 jint unicode_ch;
5043 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5044 p = tmp_p;
5045 last_is_slash = false;
5046 // Check if ch is Java identifier start or is Java identifier part
5047 // 4672820: call java.lang.Character methods directly without generating separate tables.
5048 EXCEPTION_MARK;
5049 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5050
5051 // return value
5052 JavaValue result(T_BOOLEAN);
5053 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5054 JavaCallArguments args;
5055 args.push_int(unicode_ch);
5056
5057 // public static boolean isJavaIdentifierStart(char ch);
5058 JavaCalls::call_static(&result,
5059 klass,
5060 vmSymbols::isJavaIdentifierStart_name(),
5061 vmSymbols::int_bool_signature(),
5062 &args,
5063 THREAD);
5064
5065 if (HAS_PENDING_EXCEPTION) {
5066 CLEAR_PENDING_EXCEPTION;
5067 return 0;
5068 }
5069 if (result.get_jboolean()) {
5070 continue;
5071 }
5072
5073 if (not_first_ch) {
5074 // public static boolean isJavaIdentifierPart(char ch);
5075 JavaCalls::call_static(&result,
5076 klass,
5077 vmSymbols::isJavaIdentifierPart_name(),
5078 vmSymbols::int_bool_signature(),
5079 &args,
5080 THREAD);
5081
5082 if (HAS_PENDING_EXCEPTION) {
5083 CLEAR_PENDING_EXCEPTION;
5084 return 0;
5085 }
5086
5087 if (result.get_jboolean()) {
5088 continue;
5089 }
5090 }
5091 }
5092 return (not_first_ch) ? old_p : NULL;
5093 }
5094 return (not_first_ch) ? p : NULL;
5095 }
5096
5097
5098 // Take pointer to a string. Skip over the longest part of the string that could
5099 // be taken as a field signature. Allow "void" if void_ok.
5100 // Return a pointer to just past the signature.
5101 // Return NULL if no legal signature is found.
5102 char* ClassFileParser::skip_over_field_signature(char* signature,
5103 bool void_ok,
5104 unsigned int length,
5105 TRAPS) {
5106 unsigned int array_dim = 0;
5107 while (length > 0) {
5108 switch (signature[0]) {
5109 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5110 case JVM_SIGNATURE_BOOLEAN:
5111 case JVM_SIGNATURE_BYTE:
5112 case JVM_SIGNATURE_CHAR:
5113 case JVM_SIGNATURE_SHORT:
5114 case JVM_SIGNATURE_INT:
5115 case JVM_SIGNATURE_FLOAT:
5116 case JVM_SIGNATURE_LONG:
5117 case JVM_SIGNATURE_DOUBLE:
5118 return signature + 1;
5119 case JVM_SIGNATURE_CLASS: {
5120 if (_major_version < JAVA_1_5_VERSION) {
5121 // Skip over the class name if one is there
5122 char* p = skip_over_field_name(signature + 1, true, --length);
5123
5124 // The next character better be a semicolon
5125 if (p && (p - signature) > 1 && p[0] == ';') {
5126 return p + 1;
5127 }
5128 } else {
5129 // 4900761: For class version > 48, any unicode is allowed in class name.
5130 length--;
5131 signature++;
5132 while (length > 0 && signature[0] != ';') {
5133 if (signature[0] == '.') {
5134 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5135 }
5136 length--;
5137 signature++;
5138 }
5139 if (signature[0] == ';') { return signature + 1; }
5140 }
5141
5142 return NULL;
5143 }
5144 case JVM_SIGNATURE_ARRAY:
5145 array_dim++;
5146 if (array_dim > 255) {
5147 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5148 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5149 }
5150 // The rest of what's there better be a legal signature
5151 signature++;
5152 length--;
5153 void_ok = false;
5154 break;
5155
5156 default:
5157 return NULL;
5158 }
5159 }
5160 return NULL;
5161 }