1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #if INCLUDE_CDS
35 #include "classfile/systemDictionaryShared.hpp"
36 #endif
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "memory/allocation.hpp"
41 #include "memory/gcLocker.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/referenceType.hpp"
45 #include "memory/universe.inline.hpp"
46 #include "oops/constantPool.hpp"
47 #include "oops/fieldStreams.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/instanceMirrorKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/klassVtable.hpp"
52 #include "oops/method.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvm.h"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/jvmtiThreadState.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/perfData.hpp"
59 #include "runtime/reflection.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/classLoadingService.hpp"
63 #include "services/threadService.hpp"
64 #include "utilities/array.hpp"
65 #include "utilities/globalDefinitions.hpp"
66 #include "utilities/ostream.hpp"
67
68 // We generally try to create the oops directly when parsing, rather than
69 // allocating temporary data structures and copying the bytes twice. A
70 // temporary area is only needed when parsing utf8 entries in the constant
71 // pool and when parsing line number tables.
72
73 // We add assert in debug mode when class format is not checked.
74
75 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
76 #define JAVA_MIN_SUPPORTED_VERSION 45
77 #define JAVA_MAX_SUPPORTED_VERSION 52
78 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
79
80 // Used for two backward compatibility reasons:
81 // - to check for new additions to the class file format in JDK1.5
82 // - to check for bug fixes in the format checker in JDK1.5
83 #define JAVA_1_5_VERSION 49
84
85 // Used for backward compatibility reasons:
86 // - to check for javac bug fixes that happened after 1.5
87 // - also used as the max version when running in jdk6
88 #define JAVA_6_VERSION 50
89
90 // Used for backward compatibility reasons:
91 // - to check NameAndType_info signatures more aggressively
92 #define JAVA_7_VERSION 51
93
94 // Extension method support.
95 #define JAVA_8_VERSION 52
96
97 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
98 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
99 // this function (_current can be allocated in a register, with scalar
100 // replacement of aggregates). The _current pointer is copied back to
101 // stream() when this function returns. DON'T call another method within
102 // this method that uses stream().
103 ClassFileStream* cfs0 = stream();
104 ClassFileStream cfs1 = *cfs0;
105 ClassFileStream* cfs = &cfs1;
106 #ifdef ASSERT
107 assert(cfs->allocated_on_stack(),"should be local");
108 u1* old_current = cfs0->current();
109 #endif
110 Handle class_loader(THREAD, _loader_data->class_loader());
111
112 // Used for batching symbol allocations.
113 const char* names[SymbolTable::symbol_alloc_batch_size];
114 int lengths[SymbolTable::symbol_alloc_batch_size];
115 int indices[SymbolTable::symbol_alloc_batch_size];
116 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
117 int names_count = 0;
118
119 // parsing Index 0 is unused
120 for (int index = 1; index < length; index++) {
121 // Each of the following case guarantees one more byte in the stream
122 // for the following tag or the access_flags following constant pool,
123 // so we don't need bounds-check for reading tag.
124 u1 tag = cfs->get_u1_fast();
125 switch (tag) {
126 case JVM_CONSTANT_Class :
127 {
128 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
129 u2 name_index = cfs->get_u2_fast();
130 _cp->klass_index_at_put(index, name_index);
131 }
132 break;
133 case JVM_CONSTANT_Fieldref :
134 {
135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
136 u2 class_index = cfs->get_u2_fast();
137 u2 name_and_type_index = cfs->get_u2_fast();
138 _cp->field_at_put(index, class_index, name_and_type_index);
139 }
140 break;
141 case JVM_CONSTANT_Methodref :
142 {
143 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
144 u2 class_index = cfs->get_u2_fast();
145 u2 name_and_type_index = cfs->get_u2_fast();
146 _cp->method_at_put(index, class_index, name_and_type_index);
147 }
148 break;
149 case JVM_CONSTANT_InterfaceMethodref :
150 {
151 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
152 u2 class_index = cfs->get_u2_fast();
153 u2 name_and_type_index = cfs->get_u2_fast();
154 _cp->interface_method_at_put(index, class_index, name_and_type_index);
155 }
156 break;
157 case JVM_CONSTANT_String :
158 {
159 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
160 u2 string_index = cfs->get_u2_fast();
161 _cp->string_index_at_put(index, string_index);
162 }
163 break;
164 case JVM_CONSTANT_MethodHandle :
165 case JVM_CONSTANT_MethodType :
166 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
167 classfile_parse_error(
168 "Class file version does not support constant tag %u in class file %s",
169 tag, CHECK);
170 }
171 if (!EnableInvokeDynamic) {
172 classfile_parse_error(
173 "This JVM does not support constant tag %u in class file %s",
174 tag, CHECK);
175 }
176 if (tag == JVM_CONSTANT_MethodHandle) {
177 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
178 u1 ref_kind = cfs->get_u1_fast();
179 u2 method_index = cfs->get_u2_fast();
180 _cp->method_handle_index_at_put(index, ref_kind, method_index);
181 } else if (tag == JVM_CONSTANT_MethodType) {
182 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
183 u2 signature_index = cfs->get_u2_fast();
184 _cp->method_type_index_at_put(index, signature_index);
185 } else {
186 ShouldNotReachHere();
187 }
188 break;
189 case JVM_CONSTANT_InvokeDynamic :
190 {
191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
192 classfile_parse_error(
193 "Class file version does not support constant tag %u in class file %s",
194 tag, CHECK);
195 }
196 if (!EnableInvokeDynamic) {
197 classfile_parse_error(
198 "This JVM does not support constant tag %u in class file %s",
199 tag, CHECK);
200 }
201 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
202 u2 bootstrap_specifier_index = cfs->get_u2_fast();
203 u2 name_and_type_index = cfs->get_u2_fast();
204 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
205 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
206 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
207 }
208 break;
209 case JVM_CONSTANT_Integer :
210 {
211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
212 u4 bytes = cfs->get_u4_fast();
213 _cp->int_at_put(index, (jint) bytes);
214 }
215 break;
216 case JVM_CONSTANT_Float :
217 {
218 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
219 u4 bytes = cfs->get_u4_fast();
220 _cp->float_at_put(index, *(jfloat*)&bytes);
221 }
222 break;
223 case JVM_CONSTANT_Long :
224 // A mangled type might cause you to overrun allocated memory
225 guarantee_property(index+1 < length,
226 "Invalid constant pool entry %u in class file %s",
227 index, CHECK);
228 {
229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
230 u8 bytes = cfs->get_u8_fast();
231 _cp->long_at_put(index, bytes);
232 }
233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
234 break;
235 case JVM_CONSTANT_Double :
236 // A mangled type might cause you to overrun allocated memory
237 guarantee_property(index+1 < length,
238 "Invalid constant pool entry %u in class file %s",
239 index, CHECK);
240 {
241 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
242 u8 bytes = cfs->get_u8_fast();
243 _cp->double_at_put(index, *(jdouble*)&bytes);
244 }
245 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
246 break;
247 case JVM_CONSTANT_NameAndType :
248 {
249 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
250 u2 name_index = cfs->get_u2_fast();
251 u2 signature_index = cfs->get_u2_fast();
252 _cp->name_and_type_at_put(index, name_index, signature_index);
253 }
254 break;
255 case JVM_CONSTANT_Utf8 :
256 {
257 cfs->guarantee_more(2, CHECK); // utf8_length
258 u2 utf8_length = cfs->get_u2_fast();
259 u1* utf8_buffer = cfs->get_u1_buffer();
260 assert(utf8_buffer != NULL, "null utf8 buffer");
261 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
262 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
263 cfs->skip_u1_fast(utf8_length);
264
265 // Before storing the symbol, make sure it's legal
266 if (_need_verify) {
267 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
268 }
269
270 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
271 Handle patch = clear_cp_patch_at(index);
272 guarantee_property(java_lang_String::is_instance(patch()),
273 "Illegal utf8 patch at %d in class file %s",
274 index, CHECK);
275 char* str = java_lang_String::as_utf8_string(patch());
276 // (could use java_lang_String::as_symbol instead, but might as well batch them)
277 utf8_buffer = (u1*) str;
278 utf8_length = (int) strlen(str);
279 }
280
281 unsigned int hash;
282 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
283 if (result == NULL) {
284 names[names_count] = (char*)utf8_buffer;
285 lengths[names_count] = utf8_length;
286 indices[names_count] = index;
287 hashValues[names_count++] = hash;
288 if (names_count == SymbolTable::symbol_alloc_batch_size) {
289 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
290 names_count = 0;
291 }
292 } else {
293 _cp->symbol_at_put(index, result);
294 }
295 }
296 break;
297 default:
298 classfile_parse_error(
299 "Unknown constant tag %u in class file %s", tag, CHECK);
300 break;
301 }
302 }
303
304 // Allocate the remaining symbols
305 if (names_count > 0) {
306 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
307 }
308
309 // Copy _current pointer of local copy back to stream().
310 #ifdef ASSERT
311 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
312 #endif
313 cfs0->set_current(cfs1.current());
314 }
315
316 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
317
318 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
319 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
320 return cp->symbol_at(index);
321 else
322 return NULL;
323 }
324
325 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
326 ClassFileStream* cfs = stream();
327 constantPoolHandle nullHandle;
328
329 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
330 u2 length = cfs->get_u2_fast();
331 guarantee_property(
332 length >= 1, "Illegal constant pool size %u in class file %s",
333 length, CHECK_(nullHandle));
334 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
335 CHECK_(nullHandle));
336 _cp = constant_pool; // save in case of errors
337 constantPoolHandle cp (THREAD, constant_pool);
338
339 // parsing constant pool entries
340 parse_constant_pool_entries(length, CHECK_(nullHandle));
341
342 int index = 1; // declared outside of loops for portability
343
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_klass_reference_at(klass_ref_index),
360 "Invalid constant pool index %u in class file %s",
361 klass_ref_index,
362 CHECK_(nullHandle));
363 check_property(valid_cp_range(name_and_type_ref_index, length) &&
364 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
365 "Invalid constant pool index %u in class file %s",
366 name_and_type_ref_index,
367 CHECK_(nullHandle));
368 break;
369 }
370 case JVM_CONSTANT_String :
371 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
372 break;
373 case JVM_CONSTANT_Integer :
374 break;
375 case JVM_CONSTANT_Float :
376 break;
377 case JVM_CONSTANT_Long :
378 case JVM_CONSTANT_Double :
379 index++;
380 check_property(
381 (index < length && cp->tag_at(index).is_invalid()),
382 "Improper constant pool long/double index %u in class file %s",
383 index, CHECK_(nullHandle));
384 break;
385 case JVM_CONSTANT_NameAndType : {
386 if (!_need_verify) break;
387 int name_ref_index = cp->name_ref_index_at(index);
388 int signature_ref_index = cp->signature_ref_index_at(index);
389 check_property(valid_symbol_at(name_ref_index),
390 "Invalid constant pool index %u in class file %s",
391 name_ref_index, CHECK_(nullHandle));
392 check_property(valid_symbol_at(signature_ref_index),
393 "Invalid constant pool index %u in class file %s",
394 signature_ref_index, CHECK_(nullHandle));
395 break;
396 }
397 case JVM_CONSTANT_Utf8 :
398 break;
399 case JVM_CONSTANT_UnresolvedClass : // fall-through
400 case JVM_CONSTANT_UnresolvedClassInError:
401 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
402 break;
403 case JVM_CONSTANT_ClassIndex :
404 {
405 int class_index = cp->klass_index_at(index);
406 check_property(valid_symbol_at(class_index),
407 "Invalid constant pool index %u in class file %s",
408 class_index, CHECK_(nullHandle));
409 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
410 }
411 break;
412 case JVM_CONSTANT_StringIndex :
413 {
414 int string_index = cp->string_index_at(index);
415 check_property(valid_symbol_at(string_index),
416 "Invalid constant pool index %u in class file %s",
417 string_index, CHECK_(nullHandle));
418 Symbol* sym = cp->symbol_at(string_index);
419 cp->unresolved_string_at_put(index, sym);
420 }
421 break;
422 case JVM_CONSTANT_MethodHandle :
423 {
424 int ref_index = cp->method_handle_index_at(index);
425 check_property(
426 valid_cp_range(ref_index, length) &&
427 EnableInvokeDynamic,
428 "Invalid constant pool index %u in class file %s",
429 ref_index, CHECK_(nullHandle));
430 constantTag tag = cp->tag_at(ref_index);
431 int ref_kind = cp->method_handle_ref_kind_at(index);
432 switch (ref_kind) {
433 case JVM_REF_getField:
434 case JVM_REF_getStatic:
435 case JVM_REF_putField:
436 case JVM_REF_putStatic:
437 check_property(
438 tag.is_field(),
439 "Invalid constant pool index %u in class file %s (not a field)",
440 ref_index, CHECK_(nullHandle));
441 break;
442 case JVM_REF_invokeVirtual:
443 case JVM_REF_newInvokeSpecial:
444 check_property(
445 tag.is_method(),
446 "Invalid constant pool index %u in class file %s (not a method)",
447 ref_index, CHECK_(nullHandle));
448 break;
449 case JVM_REF_invokeStatic:
450 case JVM_REF_invokeSpecial:
451 check_property(tag.is_method() ||
452 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
453 "Invalid constant pool index %u in class file %s (not a method)",
454 ref_index, CHECK_(nullHandle));
455 break;
456 case JVM_REF_invokeInterface:
457 check_property(
458 tag.is_interface_method(),
459 "Invalid constant pool index %u in class file %s (not an interface method)",
460 ref_index, CHECK_(nullHandle));
461 break;
462 default:
463 classfile_parse_error(
464 "Bad method handle kind at constant pool index %u in class file %s",
465 index, CHECK_(nullHandle));
466 }
467 // Keep the ref_index unchanged. It will be indirected at link-time.
468 }
469 break;
470 case JVM_CONSTANT_MethodType :
471 {
472 int ref_index = cp->method_type_index_at(index);
473 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
474 "Invalid constant pool index %u in class file %s",
475 ref_index, CHECK_(nullHandle));
476 }
477 break;
478 case JVM_CONSTANT_InvokeDynamic :
479 {
480 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
481 check_property(valid_cp_range(name_and_type_ref_index, length) &&
482 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
483 "Invalid constant pool index %u in class file %s",
484 name_and_type_ref_index,
485 CHECK_(nullHandle));
486 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
487 break;
488 }
489 default:
490 fatal(err_msg("bad constant pool tag value %u",
491 cp->tag_at(index).value()));
492 ShouldNotReachHere();
493 break;
494 } // end of switch
495 } // end of for
496
497 if (_cp_patches != NULL) {
498 // need to treat this_class specially...
499 assert(EnableInvokeDynamic, "");
500 int this_class_index;
501 {
502 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
503 u1* mark = cfs->current();
504 u2 flags = cfs->get_u2_fast();
505 this_class_index = cfs->get_u2_fast();
506 cfs->set_current(mark); // revert to mark
507 }
508
509 for (index = 1; index < length; index++) { // Index 0 is unused
510 if (has_cp_patch_at(index)) {
511 guarantee_property(index != this_class_index,
512 "Illegal constant pool patch to self at %d in class file %s",
513 index, CHECK_(nullHandle));
514 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
515 }
516 }
517 }
518
519 if (!_need_verify) {
520 return cp;
521 }
522
523 // second verification pass - checks the strings are of the right format.
524 // but not yet to the other entries
525 for (index = 1; index < length; index++) {
526 jbyte tag = cp->tag_at(index).value();
527 switch (tag) {
528 case JVM_CONSTANT_UnresolvedClass: {
529 Symbol* class_name = cp->unresolved_klass_at(index);
530 // check the name, even if _cp_patches will overwrite it
531 verify_legal_class_name(class_name, CHECK_(nullHandle));
532 break;
533 }
534 case JVM_CONSTANT_NameAndType: {
535 if (_need_verify && _major_version >= JAVA_7_VERSION) {
536 int sig_index = cp->signature_ref_index_at(index);
537 int name_index = cp->name_ref_index_at(index);
538 Symbol* name = cp->symbol_at(name_index);
539 Symbol* sig = cp->symbol_at(sig_index);
540 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
541 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
542 } else {
543 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
544 }
545 }
546 break;
547 }
548 case JVM_CONSTANT_InvokeDynamic:
549 case JVM_CONSTANT_Fieldref:
550 case JVM_CONSTANT_Methodref:
551 case JVM_CONSTANT_InterfaceMethodref: {
552 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
553 // already verified to be utf8
554 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
555 // already verified to be utf8
556 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
557 Symbol* name = cp->symbol_at(name_ref_index);
558 Symbol* signature = cp->symbol_at(signature_ref_index);
559 if (tag == JVM_CONSTANT_Fieldref) {
560 verify_legal_field_name(name, CHECK_(nullHandle));
561 if (_need_verify && _major_version >= JAVA_7_VERSION) {
562 // Signature is verified above, when iterating NameAndType_info.
563 // Need only to be sure it's the right type.
564 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
565 throwIllegalSignature(
566 "Field", name, signature, CHECK_(nullHandle));
567 }
568 } else {
569 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
570 }
571 } else {
572 verify_legal_method_name(name, CHECK_(nullHandle));
573 if (_need_verify && _major_version >= JAVA_7_VERSION) {
574 // Signature is verified above, when iterating NameAndType_info.
575 // Need only to be sure it's the right type.
576 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
577 throwIllegalSignature(
578 "Method", name, signature, CHECK_(nullHandle));
579 }
580 } else {
581 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
582 }
583 if (tag == JVM_CONSTANT_Methodref) {
584 // 4509014: If a class method name begins with '<', it must be "<init>".
585 assert(name != NULL, "method name in constant pool is null");
586 unsigned int name_len = name->utf8_length();
587 assert(name_len > 0, "bad method name"); // already verified as legal name
588 if (name->byte_at(0) == '<') {
589 if (name != vmSymbols::object_initializer_name()) {
590 classfile_parse_error(
591 "Bad method name at constant pool index %u in class file %s",
592 name_ref_index, CHECK_(nullHandle));
593 }
594 }
595 }
596 }
597 break;
598 }
599 case JVM_CONSTANT_MethodHandle: {
600 int ref_index = cp->method_handle_index_at(index);
601 int ref_kind = cp->method_handle_ref_kind_at(index);
602 switch (ref_kind) {
603 case JVM_REF_invokeVirtual:
604 case JVM_REF_invokeStatic:
605 case JVM_REF_invokeSpecial:
606 case JVM_REF_newInvokeSpecial:
607 {
608 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
609 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
610 Symbol* name = cp->symbol_at(name_ref_index);
611 if (ref_kind == JVM_REF_newInvokeSpecial) {
612 if (name != vmSymbols::object_initializer_name()) {
613 classfile_parse_error(
614 "Bad constructor name at constant pool index %u in class file %s",
615 name_ref_index, CHECK_(nullHandle));
616 }
617 } else {
618 if (name == vmSymbols::object_initializer_name()) {
619 classfile_parse_error(
620 "Bad method name at constant pool index %u in class file %s",
621 name_ref_index, CHECK_(nullHandle));
622 }
623 }
624 }
625 break;
626 // Other ref_kinds are already fully checked in previous pass.
627 }
628 break;
629 }
630 case JVM_CONSTANT_MethodType: {
631 Symbol* no_name = vmSymbols::type_name(); // place holder
632 Symbol* signature = cp->method_type_signature_at(index);
633 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
634 break;
635 }
636 case JVM_CONSTANT_Utf8: {
637 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
638 }
639 } // end of switch
640 } // end of for
641
642 return cp;
643 }
644
645
646 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
647 assert(EnableInvokeDynamic, "");
648 BasicType patch_type = T_VOID;
649
650 switch (cp->tag_at(index).value()) {
651
652 case JVM_CONSTANT_UnresolvedClass :
653 // Patching a class means pre-resolving it.
654 // The name in the constant pool is ignored.
655 if (java_lang_Class::is_instance(patch())) {
656 guarantee_property(!java_lang_Class::is_primitive(patch()),
657 "Illegal class patch at %d in class file %s",
658 index, CHECK);
659 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
660 } else {
661 guarantee_property(java_lang_String::is_instance(patch()),
662 "Illegal class patch at %d in class file %s",
663 index, CHECK);
664 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
665 cp->unresolved_klass_at_put(index, name);
666 }
667 break;
668
669 case JVM_CONSTANT_String :
670 // skip this patch and don't clear it. Needs the oop array for resolved
671 // references to be created first.
672 return;
673
674 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
675 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
676 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
677 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
678 patch_prim:
679 {
680 jvalue value;
681 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
682 guarantee_property(value_type == patch_type,
683 "Illegal primitive patch at %d in class file %s",
684 index, CHECK);
685 switch (value_type) {
686 case T_INT: cp->int_at_put(index, value.i); break;
687 case T_FLOAT: cp->float_at_put(index, value.f); break;
688 case T_LONG: cp->long_at_put(index, value.j); break;
689 case T_DOUBLE: cp->double_at_put(index, value.d); break;
690 default: assert(false, "");
691 }
692 }
693 break;
694
695 default:
696 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
697 guarantee_property(!has_cp_patch_at(index),
698 "Illegal unexpected patch at %d in class file %s",
699 index, CHECK);
700 return;
701 }
702
703 // On fall-through, mark the patch as used.
704 clear_cp_patch_at(index);
705 }
706
707
708
709 class NameSigHash: public ResourceObj {
710 public:
711 Symbol* _name; // name
712 Symbol* _sig; // signature
713 NameSigHash* _next; // Next entry in hash table
714 };
715
716
717 #define HASH_ROW_SIZE 256
718
719 unsigned int hash(Symbol* name, Symbol* sig) {
720 unsigned int raw_hash = 0;
721 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
722 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
723
724 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
725 }
726
727
728 void initialize_hashtable(NameSigHash** table) {
729 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
730 }
731
732 // Return false if the name/sig combination is found in table.
733 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
734 // The old format checker uses heap sort to find duplicates.
735 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
736 // of table since we don't expect Symbol*'s to move.
737 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
738 assert(name != NULL, "name in constant pool is NULL");
739
740 // First lookup for duplicates
741 int index = hash(name, sig);
742 NameSigHash* entry = table[index];
743 while (entry != NULL) {
744 if (entry->_name == name && entry->_sig == sig) {
745 return false;
746 }
747 entry = entry->_next;
748 }
749
750 // No duplicate is found, allocate a new entry and fill it.
751 entry = new NameSigHash();
752 entry->_name = name;
753 entry->_sig = sig;
754
755 // Insert into hash table
756 entry->_next = table[index];
757 table[index] = entry;
758
759 return true;
760 }
761
762
763 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
764 Handle protection_domain,
765 Symbol* class_name,
766 bool* has_default_methods,
767 TRAPS) {
768 if (length == 0) {
769 _local_interfaces = Universe::the_empty_klass_array();
770 } else {
771 ClassFileStream* cfs = stream();
772 assert(length > 0, "only called for length>0");
773 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
774
775 int index;
776 for (index = 0; index < length; index++) {
777 u2 interface_index = cfs->get_u2(CHECK_NULL);
778 KlassHandle interf;
779 check_property(
780 valid_klass_reference_at(interface_index),
781 "Interface name has bad constant pool index %u in class file %s",
782 interface_index, CHECK_NULL);
783 if (_cp->tag_at(interface_index).is_klass()) {
784 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
785 } else {
786 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
787
788 // Don't need to check legal name because it's checked when parsing constant pool.
789 // But need to make sure it's not an array type.
790 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
791 "Bad interface name in class file %s", CHECK_NULL);
792 Handle class_loader(THREAD, _loader_data->class_loader());
793
794 // Call resolve_super so classcircularity is checked
795 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
796 unresolved_klass, class_loader, protection_domain,
797 false, CHECK_NULL);
798 interf = KlassHandle(THREAD, k);
799 }
800
801 if (!interf()->is_interface()) {
802 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
803 }
804 if (InstanceKlass::cast(interf())->has_default_methods()) {
805 *has_default_methods = true;
806 }
807 _local_interfaces->at_put(index, interf());
808 }
809
810 if (!_need_verify || length <= 1) {
811 return _local_interfaces;
812 }
813
814 // Check if there's any duplicates in interfaces
815 ResourceMark rm(THREAD);
816 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
817 THREAD, NameSigHash*, HASH_ROW_SIZE);
818 initialize_hashtable(interface_names);
819 bool dup = false;
820 {
821 debug_only(No_Safepoint_Verifier nsv;)
822 for (index = 0; index < length; index++) {
823 Klass* k = _local_interfaces->at(index);
824 Symbol* name = InstanceKlass::cast(k)->name();
825 // If no duplicates, add (name, NULL) in hashtable interface_names.
826 if (!put_after_lookup(name, NULL, interface_names)) {
827 dup = true;
828 break;
829 }
830 }
831 }
832 if (dup) {
833 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
834 }
835 }
836 return _local_interfaces;
837 }
838
839
840 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
841 // Make sure the constant pool entry is of a type appropriate to this field
842 guarantee_property(
843 (constantvalue_index > 0 &&
844 constantvalue_index < _cp->length()),
845 "Bad initial value index %u in ConstantValue attribute in class file %s",
846 constantvalue_index, CHECK);
847 constantTag value_type = _cp->tag_at(constantvalue_index);
848 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
849 case T_LONG:
850 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
851 break;
852 case T_FLOAT:
853 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
854 break;
855 case T_DOUBLE:
856 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
857 break;
858 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
859 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
860 break;
861 case T_OBJECT:
862 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
863 && value_type.is_string()),
864 "Bad string initial value in class file %s", CHECK);
865 break;
866 default:
867 classfile_parse_error(
868 "Unable to set initial value %u in class file %s",
869 constantvalue_index, CHECK);
870 }
871 }
872
873
874 // Parse attributes for a field.
875 void ClassFileParser::parse_field_attributes(u2 attributes_count,
876 bool is_static, u2 signature_index,
877 u2* constantvalue_index_addr,
878 bool* is_synthetic_addr,
879 u2* generic_signature_index_addr,
880 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
881 TRAPS) {
882 ClassFileStream* cfs = stream();
883 assert(attributes_count > 0, "length should be greater than 0");
884 u2 constantvalue_index = 0;
885 u2 generic_signature_index = 0;
886 bool is_synthetic = false;
887 u1* runtime_visible_annotations = NULL;
888 int runtime_visible_annotations_length = 0;
889 u1* runtime_invisible_annotations = NULL;
890 int runtime_invisible_annotations_length = 0;
891 u1* runtime_visible_type_annotations = NULL;
892 int runtime_visible_type_annotations_length = 0;
893 u1* runtime_invisible_type_annotations = NULL;
894 int runtime_invisible_type_annotations_length = 0;
895 bool runtime_invisible_type_annotations_exists = false;
896 while (attributes_count--) {
897 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
898 u2 attribute_name_index = cfs->get_u2_fast();
899 u4 attribute_length = cfs->get_u4_fast();
900 check_property(valid_symbol_at(attribute_name_index),
901 "Invalid field attribute index %u in class file %s",
902 attribute_name_index,
903 CHECK);
904 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
905 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
906 // ignore if non-static
907 if (constantvalue_index != 0) {
908 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
909 }
910 check_property(
911 attribute_length == 2,
912 "Invalid ConstantValue field attribute length %u in class file %s",
913 attribute_length, CHECK);
914 constantvalue_index = cfs->get_u2(CHECK);
915 if (_need_verify) {
916 verify_constantvalue(constantvalue_index, signature_index, CHECK);
917 }
918 } else if (attribute_name == vmSymbols::tag_synthetic()) {
919 if (attribute_length != 0) {
920 classfile_parse_error(
921 "Invalid Synthetic field attribute length %u in class file %s",
922 attribute_length, CHECK);
923 }
924 is_synthetic = true;
925 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
926 if (attribute_length != 0) {
927 classfile_parse_error(
928 "Invalid Deprecated field attribute length %u in class file %s",
929 attribute_length, CHECK);
930 }
931 } else if (_major_version >= JAVA_1_5_VERSION) {
932 if (attribute_name == vmSymbols::tag_signature()) {
933 if (attribute_length != 2) {
934 classfile_parse_error(
935 "Wrong size %u for field's Signature attribute in class file %s",
936 attribute_length, CHECK);
937 }
938 generic_signature_index = parse_generic_signature_attribute(CHECK);
939 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
940 runtime_visible_annotations_length = attribute_length;
941 runtime_visible_annotations = cfs->get_u1_buffer();
942 assert(runtime_visible_annotations != NULL, "null visible annotations");
943 parse_annotations(runtime_visible_annotations,
944 runtime_visible_annotations_length,
945 parsed_annotations,
946 CHECK);
947 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
948 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
949 runtime_invisible_annotations_length = attribute_length;
950 runtime_invisible_annotations = cfs->get_u1_buffer();
951 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
952 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
953 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
954 if (runtime_visible_type_annotations != NULL) {
955 classfile_parse_error(
956 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
957 }
958 runtime_visible_type_annotations_length = attribute_length;
959 runtime_visible_type_annotations = cfs->get_u1_buffer();
960 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
961 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
962 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
963 if (runtime_invisible_type_annotations_exists) {
964 classfile_parse_error(
965 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
966 } else {
967 runtime_invisible_type_annotations_exists = true;
968 }
969 if (PreserveAllAnnotations) {
970 runtime_invisible_type_annotations_length = attribute_length;
971 runtime_invisible_type_annotations = cfs->get_u1_buffer();
972 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
973 }
974 cfs->skip_u1(attribute_length, CHECK);
975 } else {
976 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
977 }
978 } else {
979 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
980 }
981 }
982
983 *constantvalue_index_addr = constantvalue_index;
984 *is_synthetic_addr = is_synthetic;
985 *generic_signature_index_addr = generic_signature_index;
986 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
987 runtime_visible_annotations_length,
988 runtime_invisible_annotations,
989 runtime_invisible_annotations_length,
990 CHECK);
991 parsed_annotations->set_field_annotations(a);
992 a = assemble_annotations(runtime_visible_type_annotations,
993 runtime_visible_type_annotations_length,
994 runtime_invisible_type_annotations,
995 runtime_invisible_type_annotations_length,
996 CHECK);
997 parsed_annotations->set_field_type_annotations(a);
998 return;
999 }
1000
1001
1002 // Field allocation types. Used for computing field offsets.
1003
1004 enum FieldAllocationType {
1005 STATIC_OOP, // Oops
1006 STATIC_BYTE, // Boolean, Byte, char
1007 STATIC_SHORT, // shorts
1008 STATIC_WORD, // ints
1009 STATIC_DOUBLE, // aligned long or double
1010 NONSTATIC_OOP,
1011 NONSTATIC_BYTE,
1012 NONSTATIC_SHORT,
1013 NONSTATIC_WORD,
1014 NONSTATIC_DOUBLE,
1015 MAX_FIELD_ALLOCATION_TYPE,
1016 BAD_ALLOCATION_TYPE = -1
1017 };
1018
1019 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1020 BAD_ALLOCATION_TYPE, // 0
1021 BAD_ALLOCATION_TYPE, // 1
1022 BAD_ALLOCATION_TYPE, // 2
1023 BAD_ALLOCATION_TYPE, // 3
1024 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1025 NONSTATIC_SHORT, // T_CHAR = 5,
1026 NONSTATIC_WORD, // T_FLOAT = 6,
1027 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1028 NONSTATIC_BYTE, // T_BYTE = 8,
1029 NONSTATIC_SHORT, // T_SHORT = 9,
1030 NONSTATIC_WORD, // T_INT = 10,
1031 NONSTATIC_DOUBLE, // T_LONG = 11,
1032 NONSTATIC_OOP, // T_OBJECT = 12,
1033 NONSTATIC_OOP, // T_ARRAY = 13,
1034 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1035 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1036 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1037 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1038 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1039 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1040 BAD_ALLOCATION_TYPE, // 0
1041 BAD_ALLOCATION_TYPE, // 1
1042 BAD_ALLOCATION_TYPE, // 2
1043 BAD_ALLOCATION_TYPE, // 3
1044 STATIC_BYTE , // T_BOOLEAN = 4,
1045 STATIC_SHORT, // T_CHAR = 5,
1046 STATIC_WORD, // T_FLOAT = 6,
1047 STATIC_DOUBLE, // T_DOUBLE = 7,
1048 STATIC_BYTE, // T_BYTE = 8,
1049 STATIC_SHORT, // T_SHORT = 9,
1050 STATIC_WORD, // T_INT = 10,
1051 STATIC_DOUBLE, // T_LONG = 11,
1052 STATIC_OOP, // T_OBJECT = 12,
1053 STATIC_OOP, // T_ARRAY = 13,
1054 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1055 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1056 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1057 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1058 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1059 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1060 };
1061
1062 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1063 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1064 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1065 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1066 return result;
1067 }
1068
1069 class FieldAllocationCount: public ResourceObj {
1070 public:
1071 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1072
1073 FieldAllocationCount() {
1074 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1075 count[i] = 0;
1076 }
1077 }
1078
1079 FieldAllocationType update(bool is_static, BasicType type) {
1080 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1081 // Make sure there is no overflow with injected fields.
1082 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1083 count[atype]++;
1084 return atype;
1085 }
1086 };
1087
1088 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1089 bool is_interface,
1090 FieldAllocationCount *fac,
1091 u2* java_fields_count_ptr, TRAPS) {
1092 ClassFileStream* cfs = stream();
1093 cfs->guarantee_more(2, CHECK_NULL); // length
1094 u2 length = cfs->get_u2_fast();
1095 *java_fields_count_ptr = length;
1096
1097 int num_injected = 0;
1098 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1099 int total_fields = length + num_injected;
1100
1101 // The field array starts with tuples of shorts
1102 // [access, name index, sig index, initial value index, byte offset].
1103 // A generic signature slot only exists for field with generic
1104 // signature attribute. And the access flag is set with
1105 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1106 // signature slots are at the end of the field array and after all
1107 // other fields data.
1108 //
1109 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1110 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1111 // ...
1112 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1113 // [generic signature index]
1114 // [generic signature index]
1115 // ...
1116 //
1117 // Allocate a temporary resource array for field data. For each field,
1118 // a slot is reserved in the temporary array for the generic signature
1119 // index. After parsing all fields, the data are copied to a permanent
1120 // array and any unused slots will be discarded.
1121 ResourceMark rm(THREAD);
1122 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1123 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1124
1125 // The generic signature slots start after all other fields' data.
1126 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1127 int num_generic_signature = 0;
1128 for (int n = 0; n < length; n++) {
1129 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1130
1131 AccessFlags access_flags;
1132 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1133 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1134 access_flags.set_flags(flags);
1135
1136 u2 name_index = cfs->get_u2_fast();
1137 int cp_size = _cp->length();
1138 check_property(valid_symbol_at(name_index),
1139 "Invalid constant pool index %u for field name in class file %s",
1140 name_index,
1141 CHECK_NULL);
1142 Symbol* name = _cp->symbol_at(name_index);
1143 verify_legal_field_name(name, CHECK_NULL);
1144
1145 u2 signature_index = cfs->get_u2_fast();
1146 check_property(valid_symbol_at(signature_index),
1147 "Invalid constant pool index %u for field signature in class file %s",
1148 signature_index, CHECK_NULL);
1149 Symbol* sig = _cp->symbol_at(signature_index);
1150 verify_legal_field_signature(name, sig, CHECK_NULL);
1151
1152 u2 constantvalue_index = 0;
1153 bool is_synthetic = false;
1154 u2 generic_signature_index = 0;
1155 bool is_static = access_flags.is_static();
1156 FieldAnnotationCollector parsed_annotations(_loader_data);
1157
1158 u2 attributes_count = cfs->get_u2_fast();
1159 if (attributes_count > 0) {
1160 parse_field_attributes(attributes_count, is_static, signature_index,
1161 &constantvalue_index, &is_synthetic,
1162 &generic_signature_index, &parsed_annotations,
1163 CHECK_NULL);
1164 if (parsed_annotations.field_annotations() != NULL) {
1165 if (_fields_annotations == NULL) {
1166 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1167 _loader_data, length, NULL,
1168 CHECK_NULL);
1169 }
1170 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1171 parsed_annotations.set_field_annotations(NULL);
1172 }
1173 if (parsed_annotations.field_type_annotations() != NULL) {
1174 if (_fields_type_annotations == NULL) {
1175 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1176 _loader_data, length, NULL,
1177 CHECK_NULL);
1178 }
1179 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1180 parsed_annotations.set_field_type_annotations(NULL);
1181 }
1182
1183 if (is_synthetic) {
1184 access_flags.set_is_synthetic();
1185 }
1186 if (generic_signature_index != 0) {
1187 access_flags.set_field_has_generic_signature();
1188 fa[generic_signature_slot] = generic_signature_index;
1189 generic_signature_slot ++;
1190 num_generic_signature ++;
1191 }
1192 }
1193
1194 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1195 field->initialize(access_flags.as_short(),
1196 name_index,
1197 signature_index,
1198 constantvalue_index);
1199 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1200
1201 // Remember how many oops we encountered and compute allocation type
1202 FieldAllocationType atype = fac->update(is_static, type);
1203 field->set_allocation_type(atype);
1204
1205 // After field is initialized with type, we can augment it with aux info
1206 if (parsed_annotations.has_any_annotations())
1207 parsed_annotations.apply_to(field);
1208 }
1209
1210 int index = length;
1211 if (num_injected != 0) {
1212 for (int n = 0; n < num_injected; n++) {
1213 // Check for duplicates
1214 if (injected[n].may_be_java) {
1215 Symbol* name = injected[n].name();
1216 Symbol* signature = injected[n].signature();
1217 bool duplicate = false;
1218 for (int i = 0; i < length; i++) {
1219 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1220 if (name == _cp->symbol_at(f->name_index()) &&
1221 signature == _cp->symbol_at(f->signature_index())) {
1222 // Symbol is desclared in Java so skip this one
1223 duplicate = true;
1224 break;
1225 }
1226 }
1227 if (duplicate) {
1228 // These will be removed from the field array at the end
1229 continue;
1230 }
1231 }
1232
1233 // Injected field
1234 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1235 field->initialize(JVM_ACC_FIELD_INTERNAL,
1236 injected[n].name_index,
1237 injected[n].signature_index,
1238 0);
1239
1240 BasicType type = FieldType::basic_type(injected[n].signature());
1241
1242 // Remember how many oops we encountered and compute allocation type
1243 FieldAllocationType atype = fac->update(false, type);
1244 field->set_allocation_type(atype);
1245 index++;
1246 }
1247 }
1248
1249 // Now copy the fields' data from the temporary resource array.
1250 // Sometimes injected fields already exist in the Java source so
1251 // the fields array could be too long. In that case the
1252 // fields array is trimed. Also unused slots that were reserved
1253 // for generic signature indexes are discarded.
1254 Array<u2>* fields = MetadataFactory::new_array<u2>(
1255 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1256 CHECK_NULL);
1257 _fields = fields; // save in case of error
1258 {
1259 int i = 0;
1260 for (; i < index * FieldInfo::field_slots; i++) {
1261 fields->at_put(i, fa[i]);
1262 }
1263 for (int j = total_fields * FieldInfo::field_slots;
1264 j < generic_signature_slot; j++) {
1265 fields->at_put(i++, fa[j]);
1266 }
1267 assert(i == fields->length(), "");
1268 }
1269
1270 if (_need_verify && length > 1) {
1271 // Check duplicated fields
1272 ResourceMark rm(THREAD);
1273 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1274 THREAD, NameSigHash*, HASH_ROW_SIZE);
1275 initialize_hashtable(names_and_sigs);
1276 bool dup = false;
1277 {
1278 debug_only(No_Safepoint_Verifier nsv;)
1279 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1280 Symbol* name = fs.name();
1281 Symbol* sig = fs.signature();
1282 // If no duplicates, add name/signature in hashtable names_and_sigs.
1283 if (!put_after_lookup(name, sig, names_and_sigs)) {
1284 dup = true;
1285 break;
1286 }
1287 }
1288 }
1289 if (dup) {
1290 classfile_parse_error("Duplicate field name&signature in class file %s",
1291 CHECK_NULL);
1292 }
1293 }
1294
1295 return fields;
1296 }
1297
1298
1299 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1300 while (length-- > 0) {
1301 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1302 }
1303 }
1304
1305
1306 u2* ClassFileParser::parse_exception_table(u4 code_length,
1307 u4 exception_table_length,
1308 TRAPS) {
1309 ClassFileStream* cfs = stream();
1310
1311 u2* exception_table_start = cfs->get_u2_buffer();
1312 assert(exception_table_start != NULL, "null exception table");
1313 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1314 // Will check legal target after parsing code array in verifier.
1315 if (_need_verify) {
1316 for (unsigned int i = 0; i < exception_table_length; i++) {
1317 u2 start_pc = cfs->get_u2_fast();
1318 u2 end_pc = cfs->get_u2_fast();
1319 u2 handler_pc = cfs->get_u2_fast();
1320 u2 catch_type_index = cfs->get_u2_fast();
1321 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1322 "Illegal exception table range in class file %s",
1323 CHECK_NULL);
1324 guarantee_property(handler_pc < code_length,
1325 "Illegal exception table handler in class file %s",
1326 CHECK_NULL);
1327 if (catch_type_index != 0) {
1328 guarantee_property(valid_klass_reference_at(catch_type_index),
1329 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1330 }
1331 }
1332 } else {
1333 cfs->skip_u2_fast(exception_table_length * 4);
1334 }
1335 return exception_table_start;
1336 }
1337
1338 void ClassFileParser::parse_linenumber_table(
1339 u4 code_attribute_length, u4 code_length,
1340 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1341 ClassFileStream* cfs = stream();
1342 unsigned int num_entries = cfs->get_u2(CHECK);
1343
1344 // Each entry is a u2 start_pc, and a u2 line_number
1345 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1346
1347 // Verify line number attribute and table length
1348 check_property(
1349 code_attribute_length == sizeof(u2) + length_in_bytes,
1350 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1351
1352 cfs->guarantee_more(length_in_bytes, CHECK);
1353
1354 if ((*write_stream) == NULL) {
1355 if (length_in_bytes > fixed_buffer_size) {
1356 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1357 } else {
1358 (*write_stream) = new CompressedLineNumberWriteStream(
1359 linenumbertable_buffer, fixed_buffer_size);
1360 }
1361 }
1362
1363 while (num_entries-- > 0) {
1364 u2 bci = cfs->get_u2_fast(); // start_pc
1365 u2 line = cfs->get_u2_fast(); // line_number
1366 guarantee_property(bci < code_length,
1367 "Invalid pc in LineNumberTable in class file %s", CHECK);
1368 (*write_stream)->write_pair(bci, line);
1369 }
1370 }
1371
1372
1373 // Class file LocalVariableTable elements.
1374 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1375 public:
1376 u2 start_bci;
1377 u2 length;
1378 u2 name_cp_index;
1379 u2 descriptor_cp_index;
1380 u2 slot;
1381 };
1382
1383
1384 class LVT_Hash: public CHeapObj<mtClass> {
1385 public:
1386 LocalVariableTableElement *_elem; // element
1387 LVT_Hash* _next; // Next entry in hash table
1388 };
1389
1390 unsigned int hash(LocalVariableTableElement *elem) {
1391 unsigned int raw_hash = elem->start_bci;
1392
1393 raw_hash = elem->length + raw_hash * 37;
1394 raw_hash = elem->name_cp_index + raw_hash * 37;
1395 raw_hash = elem->slot + raw_hash * 37;
1396
1397 return raw_hash % HASH_ROW_SIZE;
1398 }
1399
1400 void initialize_hashtable(LVT_Hash** table) {
1401 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1402 table[i] = NULL;
1403 }
1404 }
1405
1406 void clear_hashtable(LVT_Hash** table) {
1407 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1408 LVT_Hash* current = table[i];
1409 LVT_Hash* next;
1410 while (current != NULL) {
1411 next = current->_next;
1412 current->_next = NULL;
1413 delete(current);
1414 current = next;
1415 }
1416 table[i] = NULL;
1417 }
1418 }
1419
1420 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1421 LVT_Hash* entry = table[index];
1422
1423 /*
1424 * 3-tuple start_bci/length/slot has to be unique key,
1425 * so the following comparison seems to be redundant:
1426 * && elem->name_cp_index == entry->_elem->name_cp_index
1427 */
1428 while (entry != NULL) {
1429 if (elem->start_bci == entry->_elem->start_bci
1430 && elem->length == entry->_elem->length
1431 && elem->name_cp_index == entry->_elem->name_cp_index
1432 && elem->slot == entry->_elem->slot
1433 ) {
1434 return entry;
1435 }
1436 entry = entry->_next;
1437 }
1438 return NULL;
1439 }
1440
1441 // Return false if the local variable is found in table.
1442 // Return true if no duplicate is found.
1443 // And local variable is added as a new entry in table.
1444 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1445 // First lookup for duplicates
1446 int index = hash(elem);
1447 LVT_Hash* entry = LVT_lookup(elem, index, table);
1448
1449 if (entry != NULL) {
1450 return false;
1451 }
1452 // No duplicate is found, allocate a new entry and fill it.
1453 if ((entry = new LVT_Hash()) == NULL) {
1454 return false;
1455 }
1456 entry->_elem = elem;
1457
1458 // Insert into hash table
1459 entry->_next = table[index];
1460 table[index] = entry;
1461
1462 return true;
1463 }
1464
1465 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1466 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1467 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1468 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1469 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1470 lvt->signature_cp_index = 0;
1471 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1472 }
1473
1474 // Function is used to parse both attributes:
1475 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1476 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1477 u2 max_locals,
1478 u4 code_attribute_length,
1479 u2* localvariable_table_length,
1480 bool isLVTT,
1481 TRAPS) {
1482 ClassFileStream* cfs = stream();
1483 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1484 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1485 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1486 // Verify local variable table attribute has right length
1487 if (_need_verify) {
1488 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1489 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1490 }
1491 u2* localvariable_table_start = cfs->get_u2_buffer();
1492 assert(localvariable_table_start != NULL, "null local variable table");
1493 if (!_need_verify) {
1494 cfs->skip_u2_fast(size);
1495 } else {
1496 cfs->guarantee_more(size * 2, CHECK_NULL);
1497 for(int i = 0; i < (*localvariable_table_length); i++) {
1498 u2 start_pc = cfs->get_u2_fast();
1499 u2 length = cfs->get_u2_fast();
1500 u2 name_index = cfs->get_u2_fast();
1501 u2 descriptor_index = cfs->get_u2_fast();
1502 u2 index = cfs->get_u2_fast();
1503 // Assign to a u4 to avoid overflow
1504 u4 end_pc = (u4)start_pc + (u4)length;
1505
1506 if (start_pc >= code_length) {
1507 classfile_parse_error(
1508 "Invalid start_pc %u in %s in class file %s",
1509 start_pc, tbl_name, CHECK_NULL);
1510 }
1511 if (end_pc > code_length) {
1512 classfile_parse_error(
1513 "Invalid length %u in %s in class file %s",
1514 length, tbl_name, CHECK_NULL);
1515 }
1516 int cp_size = _cp->length();
1517 guarantee_property(valid_symbol_at(name_index),
1518 "Name index %u in %s has bad constant type in class file %s",
1519 name_index, tbl_name, CHECK_NULL);
1520 guarantee_property(valid_symbol_at(descriptor_index),
1521 "Signature index %u in %s has bad constant type in class file %s",
1522 descriptor_index, tbl_name, CHECK_NULL);
1523
1524 Symbol* name = _cp->symbol_at(name_index);
1525 Symbol* sig = _cp->symbol_at(descriptor_index);
1526 verify_legal_field_name(name, CHECK_NULL);
1527 u2 extra_slot = 0;
1528 if (!isLVTT) {
1529 verify_legal_field_signature(name, sig, CHECK_NULL);
1530
1531 // 4894874: check special cases for double and long local variables
1532 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1533 sig == vmSymbols::type_signature(T_LONG)) {
1534 extra_slot = 1;
1535 }
1536 }
1537 guarantee_property((index + extra_slot) < max_locals,
1538 "Invalid index %u in %s in class file %s",
1539 index, tbl_name, CHECK_NULL);
1540 }
1541 }
1542 return localvariable_table_start;
1543 }
1544
1545
1546 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1547 u1* u1_array, u2* u2_array, TRAPS) {
1548 ClassFileStream* cfs = stream();
1549 u2 index = 0; // index in the array with long/double occupying two slots
1550 u4 i1 = *u1_index;
1551 u4 i2 = *u2_index + 1;
1552 for(int i = 0; i < array_length; i++) {
1553 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1554 index++;
1555 if (tag == ITEM_Long || tag == ITEM_Double) {
1556 index++;
1557 } else if (tag == ITEM_Object) {
1558 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1559 guarantee_property(valid_klass_reference_at(class_index),
1560 "Bad class index %u in StackMap in class file %s",
1561 class_index, CHECK);
1562 } else if (tag == ITEM_Uninitialized) {
1563 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1564 guarantee_property(
1565 offset < code_length,
1566 "Bad uninitialized type offset %u in StackMap in class file %s",
1567 offset, CHECK);
1568 } else {
1569 guarantee_property(
1570 tag <= (u1)ITEM_Uninitialized,
1571 "Unknown variable type %u in StackMap in class file %s",
1572 tag, CHECK);
1573 }
1574 }
1575 u2_array[*u2_index] = index;
1576 *u1_index = i1;
1577 *u2_index = i2;
1578 }
1579
1580 u1* ClassFileParser::parse_stackmap_table(
1581 u4 code_attribute_length, TRAPS) {
1582 if (code_attribute_length == 0)
1583 return NULL;
1584
1585 ClassFileStream* cfs = stream();
1586 u1* stackmap_table_start = cfs->get_u1_buffer();
1587 assert(stackmap_table_start != NULL, "null stackmap table");
1588
1589 // check code_attribute_length first
1590 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1591
1592 if (!_need_verify && !DumpSharedSpaces) {
1593 return NULL;
1594 }
1595 return stackmap_table_start;
1596 }
1597
1598 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1599 u4 method_attribute_length,
1600 TRAPS) {
1601 ClassFileStream* cfs = stream();
1602 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1603 *checked_exceptions_length = cfs->get_u2_fast();
1604 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1605 u2* checked_exceptions_start = cfs->get_u2_buffer();
1606 assert(checked_exceptions_start != NULL, "null checked exceptions");
1607 if (!_need_verify) {
1608 cfs->skip_u2_fast(size);
1609 } else {
1610 // Verify each value in the checked exception table
1611 u2 checked_exception;
1612 u2 len = *checked_exceptions_length;
1613 cfs->guarantee_more(2 * len, CHECK_NULL);
1614 for (int i = 0; i < len; i++) {
1615 checked_exception = cfs->get_u2_fast();
1616 check_property(
1617 valid_klass_reference_at(checked_exception),
1618 "Exception name has bad type at constant pool %u in class file %s",
1619 checked_exception, CHECK_NULL);
1620 }
1621 }
1622 // check exceptions attribute length
1623 if (_need_verify) {
1624 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1625 sizeof(u2) * size),
1626 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1627 }
1628 return checked_exceptions_start;
1629 }
1630
1631 void ClassFileParser::throwIllegalSignature(
1632 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1633 ResourceMark rm(THREAD);
1634 Exceptions::fthrow(THREAD_AND_LOCATION,
1635 vmSymbols::java_lang_ClassFormatError(),
1636 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1637 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1638 }
1639
1640 // Skip an annotation. Return >=limit if there is any problem.
1641 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1642 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1643 // value := switch (tag:u1) { ... }
1644 index += 2; // skip atype
1645 if ((index += 2) >= limit) return limit; // read nmem
1646 int nmem = Bytes::get_Java_u2(buffer+index-2);
1647 while (--nmem >= 0 && index < limit) {
1648 index += 2; // skip member
1649 index = skip_annotation_value(buffer, limit, index);
1650 }
1651 return index;
1652 }
1653
1654 // Skip an annotation value. Return >=limit if there is any problem.
1655 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1656 // value := switch (tag:u1) {
1657 // case B, C, I, S, Z, D, F, J, c: con:u2;
1658 // case e: e_class:u2 e_name:u2;
1659 // case s: s_con:u2;
1660 // case [: do(nval:u2) {value};
1661 // case @: annotation;
1662 // case s: s_con:u2;
1663 // }
1664 if ((index += 1) >= limit) return limit; // read tag
1665 u1 tag = buffer[index-1];
1666 switch (tag) {
1667 case 'B': case 'C': case 'I': case 'S': case 'Z':
1668 case 'D': case 'F': case 'J': case 'c': case 's':
1669 index += 2; // skip con or s_con
1670 break;
1671 case 'e':
1672 index += 4; // skip e_class, e_name
1673 break;
1674 case '[':
1675 {
1676 if ((index += 2) >= limit) return limit; // read nval
1677 int nval = Bytes::get_Java_u2(buffer+index-2);
1678 while (--nval >= 0 && index < limit) {
1679 index = skip_annotation_value(buffer, limit, index);
1680 }
1681 }
1682 break;
1683 case '@':
1684 index = skip_annotation(buffer, limit, index);
1685 break;
1686 default:
1687 assert(false, "annotation tag");
1688 return limit; // bad tag byte
1689 }
1690 return index;
1691 }
1692
1693 // Sift through annotations, looking for those significant to the VM:
1694 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1695 ClassFileParser::AnnotationCollector* coll,
1696 TRAPS) {
1697 // annotations := do(nann:u2) {annotation}
1698 int index = 0;
1699 if ((index += 2) >= limit) return; // read nann
1700 int nann = Bytes::get_Java_u2(buffer+index-2);
1701 enum { // initial annotation layout
1702 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1703 count_off = 2, // u2 such as 1 (one value)
1704 member_off = 4, // utf8 such as 'value'
1705 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1706 e_tag_val = 'e',
1707 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1708 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1709 e_size = 11, // end of 'e' annotation
1710 c_tag_val = 'c', // payload is type
1711 c_con_off = 7, // utf8 payload, such as 'I'
1712 c_size = 9, // end of 'c' annotation
1713 s_tag_val = 's', // payload is String
1714 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1715 s_size = 9,
1716 min_size = 6 // smallest possible size (zero members)
1717 };
1718 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1719 int index0 = index;
1720 index = skip_annotation(buffer, limit, index);
1721 u1* abase = buffer + index0;
1722 int atype = Bytes::get_Java_u2(abase + atype_off);
1723 int count = Bytes::get_Java_u2(abase + count_off);
1724 Symbol* aname = check_symbol_at(_cp, atype);
1725 if (aname == NULL) break; // invalid annotation name
1726 Symbol* member = NULL;
1727 if (count >= 1) {
1728 int member_index = Bytes::get_Java_u2(abase + member_off);
1729 member = check_symbol_at(_cp, member_index);
1730 if (member == NULL) break; // invalid member name
1731 }
1732
1733 // Here is where parsing particular annotations will take place.
1734 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1735 if (id == AnnotationCollector::_unknown) continue;
1736 coll->set_annotation(id);
1737
1738 if (id == AnnotationCollector::_sun_misc_Contended) {
1739 // @Contended can optionally specify the contention group.
1740 //
1741 // Contended group defines the equivalence class over the fields:
1742 // the fields within the same contended group are not treated distinct.
1743 // The only exception is default group, which does not incur the
1744 // equivalence. Naturally, contention group for classes is meaningless.
1745 //
1746 // While the contention group is specified as String, annotation
1747 // values are already interned, and we might as well use the constant
1748 // pool index as the group tag.
1749 //
1750 u2 group_index = 0; // default contended group
1751 if (count == 1
1752 && s_size == (index - index0) // match size
1753 && s_tag_val == *(abase + tag_off)
1754 && member == vmSymbols::value_name()) {
1755 group_index = Bytes::get_Java_u2(abase + s_con_off);
1756 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1757 group_index = 0; // default contended group
1758 }
1759 }
1760 coll->set_contended_group(group_index);
1761 }
1762 }
1763 }
1764
1765 ClassFileParser::AnnotationCollector::ID
1766 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1767 Symbol* name) {
1768 vmSymbols::SID sid = vmSymbols::find_sid(name);
1769 // Privileged code can use all annotations. Other code silently drops some.
1770 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1771 loader_data->is_ext_class_loader_data() ||
1772 loader_data->is_anonymous();
1773 switch (sid) {
1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1775 if (_location != _in_method) break; // only allow for methods
1776 if (!privileged) break; // only allow in privileged code
1777 return _method_CallerSensitive;
1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1779 if (_location != _in_method) break; // only allow for methods
1780 if (!privileged) break; // only allow in privileged code
1781 return _method_ForceInline;
1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1783 if (_location != _in_method) break; // only allow for methods
1784 if (!privileged) break; // only allow in privileged code
1785 return _method_DontInline;
1786 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1787 if (_location != _in_method) break; // only allow for methods
1788 if (!privileged) break; // only allow in privileged code
1789 return _method_InjectedProfile;
1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1791 if (_location != _in_method) break; // only allow for methods
1792 if (!privileged) break; // only allow in privileged code
1793 return _method_LambdaForm_Compiled;
1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1795 if (_location != _in_method) break; // only allow for methods
1796 if (!privileged) break; // only allow in privileged code
1797 return _method_LambdaForm_Hidden;
1798 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1799 if (_location != _in_field) break; // only allow for fields
1800 if (!privileged) break; // only allow in privileged code
1801 return _field_Stable;
1802 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1803 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1804 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1805 return _sun_misc_Contended;
1806 default: break;
1807 }
1808 return AnnotationCollector::_unknown;
1809 }
1810
1811 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1812 if (is_contended())
1813 f->set_contended_group(contended_group());
1814 if (is_stable())
1815 f->set_stable(true);
1816 }
1817
1818 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1819 // If there's an error deallocate metadata for field annotations
1820 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1821 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1822 }
1823
1824 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1825 if (has_annotation(_method_CallerSensitive))
1826 m->set_caller_sensitive(true);
1827 if (has_annotation(_method_ForceInline))
1828 m->set_force_inline(true);
1829 if (has_annotation(_method_DontInline))
1830 m->set_dont_inline(true);
1831 if (has_annotation(_method_InjectedProfile))
1832 m->set_has_injected_profile(true);
1833 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1834 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1835 if (has_annotation(_method_LambdaForm_Hidden))
1836 m->set_hidden(true);
1837 }
1838
1839 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1840 k->set_is_contended(is_contended());
1841 }
1842
1843
1844 #define MAX_ARGS_SIZE 255
1845 #define MAX_CODE_SIZE 65535
1846 #define INITIAL_MAX_LVT_NUMBER 256
1847
1848 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1849 *
1850 * Rules for LVT's and LVTT's are:
1851 * - There can be any number of LVT's and LVTT's.
1852 * - If there are n LVT's, it is the same as if there was just
1853 * one LVT containing all the entries from the n LVT's.
1854 * - There may be no more than one LVT entry per local variable.
1855 * Two LVT entries are 'equal' if these fields are the same:
1856 * start_pc, length, name, slot
1857 * - There may be no more than one LVTT entry per each LVT entry.
1858 * Each LVTT entry has to match some LVT entry.
1859 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1860 */
1861 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1862 int lvt_cnt,
1863 u2* localvariable_table_length,
1864 u2** localvariable_table_start,
1865 int lvtt_cnt,
1866 u2* localvariable_type_table_length,
1867 u2** localvariable_type_table_start,
1868 TRAPS) {
1869
1870 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1871 initialize_hashtable(lvt_Hash);
1872
1873 // To fill LocalVariableTable in
1874 Classfile_LVT_Element* cf_lvt;
1875 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1876
1877 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1878 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1879 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1880 copy_lvt_element(&cf_lvt[idx], lvt);
1881 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1882 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1883 && _need_verify
1884 && _major_version >= JAVA_1_5_VERSION) {
1885 clear_hashtable(lvt_Hash);
1886 classfile_parse_error("Duplicated LocalVariableTable attribute "
1887 "entry for '%s' in class file %s",
1888 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1889 CHECK);
1890 }
1891 }
1892 }
1893
1894 // To merge LocalVariableTable and LocalVariableTypeTable
1895 Classfile_LVT_Element* cf_lvtt;
1896 LocalVariableTableElement lvtt_elem;
1897
1898 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1899 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1900 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1901 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1902 int index = hash(&lvtt_elem);
1903 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1904 if (entry == NULL) {
1905 if (_need_verify) {
1906 clear_hashtable(lvt_Hash);
1907 classfile_parse_error("LVTT entry for '%s' in class file %s "
1908 "does not match any LVT entry",
1909 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1910 CHECK);
1911 }
1912 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1913 clear_hashtable(lvt_Hash);
1914 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1915 "entry for '%s' in class file %s",
1916 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1917 CHECK);
1918 } else {
1919 // to add generic signatures into LocalVariableTable
1920 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1921 }
1922 }
1923 }
1924 clear_hashtable(lvt_Hash);
1925 }
1926
1927
1928 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1929 u1* runtime_visible_annotations,
1930 int runtime_visible_annotations_length,
1931 u1* runtime_invisible_annotations,
1932 int runtime_invisible_annotations_length,
1933 u1* runtime_visible_parameter_annotations,
1934 int runtime_visible_parameter_annotations_length,
1935 u1* runtime_invisible_parameter_annotations,
1936 int runtime_invisible_parameter_annotations_length,
1937 u1* runtime_visible_type_annotations,
1938 int runtime_visible_type_annotations_length,
1939 u1* runtime_invisible_type_annotations,
1940 int runtime_invisible_type_annotations_length,
1941 u1* annotation_default,
1942 int annotation_default_length,
1943 TRAPS) {
1944
1945 AnnotationArray* a;
1946
1947 if (runtime_visible_annotations_length +
1948 runtime_invisible_annotations_length > 0) {
1949 a = assemble_annotations(runtime_visible_annotations,
1950 runtime_visible_annotations_length,
1951 runtime_invisible_annotations,
1952 runtime_invisible_annotations_length,
1953 CHECK);
1954 cm->set_method_annotations(a);
1955 }
1956
1957 if (runtime_visible_parameter_annotations_length +
1958 runtime_invisible_parameter_annotations_length > 0) {
1959 a = assemble_annotations(runtime_visible_parameter_annotations,
1960 runtime_visible_parameter_annotations_length,
1961 runtime_invisible_parameter_annotations,
1962 runtime_invisible_parameter_annotations_length,
1963 CHECK);
1964 cm->set_parameter_annotations(a);
1965 }
1966
1967 if (annotation_default_length > 0) {
1968 a = assemble_annotations(annotation_default,
1969 annotation_default_length,
1970 NULL,
1971 0,
1972 CHECK);
1973 cm->set_default_annotations(a);
1974 }
1975
1976 if (runtime_visible_type_annotations_length +
1977 runtime_invisible_type_annotations_length > 0) {
1978 a = assemble_annotations(runtime_visible_type_annotations,
1979 runtime_visible_type_annotations_length,
1980 runtime_invisible_type_annotations,
1981 runtime_invisible_type_annotations_length,
1982 CHECK);
1983 cm->set_type_annotations(a);
1984 }
1985 }
1986
1987
1988 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1989 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1990 // Method* to save footprint, so we only know the size of the resulting Method* when the
1991 // entire method attribute is parsed.
1992 //
1993 // The promoted_flags parameter is used to pass relevant access_flags
1994 // from the method back up to the containing klass. These flag values
1995 // are added to klass's access_flags.
1996
1997 methodHandle ClassFileParser::parse_method(bool is_interface,
1998 AccessFlags *promoted_flags,
1999 TRAPS) {
2000 ClassFileStream* cfs = stream();
2001 methodHandle nullHandle;
2002 ResourceMark rm(THREAD);
2003 // Parse fixed parts
2004 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
2005
2006 int flags = cfs->get_u2_fast();
2007 u2 name_index = cfs->get_u2_fast();
2008 int cp_size = _cp->length();
2009 check_property(
2010 valid_symbol_at(name_index),
2011 "Illegal constant pool index %u for method name in class file %s",
2012 name_index, CHECK_(nullHandle));
2013 Symbol* name = _cp->symbol_at(name_index);
2014 verify_legal_method_name(name, CHECK_(nullHandle));
2015
2016 u2 signature_index = cfs->get_u2_fast();
2017 guarantee_property(
2018 valid_symbol_at(signature_index),
2019 "Illegal constant pool index %u for method signature in class file %s",
2020 signature_index, CHECK_(nullHandle));
2021 Symbol* signature = _cp->symbol_at(signature_index);
2022
2023 AccessFlags access_flags;
2024 if (name == vmSymbols::class_initializer_name()) {
2025 // We ignore the other access flags for a valid class initializer.
2026 // (JVM Spec 2nd ed., chapter 4.6)
2027 if (_major_version < 51) { // backward compatibility
2028 flags = JVM_ACC_STATIC;
2029 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2030 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2031 }
2032 } else {
2033 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2034 }
2035
2036 int args_size = -1; // only used when _need_verify is true
2037 if (_need_verify) {
2038 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2039 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2040 if (args_size > MAX_ARGS_SIZE) {
2041 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2042 }
2043 }
2044
2045 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2046
2047 // Default values for code and exceptions attribute elements
2048 u2 max_stack = 0;
2049 u2 max_locals = 0;
2050 u4 code_length = 0;
2051 u1* code_start = 0;
2052 u2 exception_table_length = 0;
2053 u2* exception_table_start = NULL;
2054 Array<int>* exception_handlers = Universe::the_empty_int_array();
2055 u2 checked_exceptions_length = 0;
2056 u2* checked_exceptions_start = NULL;
2057 CompressedLineNumberWriteStream* linenumber_table = NULL;
2058 int linenumber_table_length = 0;
2059 int total_lvt_length = 0;
2060 u2 lvt_cnt = 0;
2061 u2 lvtt_cnt = 0;
2062 bool lvt_allocated = false;
2063 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2064 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2065 u2* localvariable_table_length;
2066 u2** localvariable_table_start;
2067 u2* localvariable_type_table_length;
2068 u2** localvariable_type_table_start;
2069 u2 method_parameters_length = 0;
2070 u1* method_parameters_data = NULL;
2071 bool method_parameters_seen = false;
2072 bool parsed_code_attribute = false;
2073 bool parsed_checked_exceptions_attribute = false;
2074 bool parsed_stackmap_attribute = false;
2075 // stackmap attribute - JDK1.5
2076 u1* stackmap_data = NULL;
2077 int stackmap_data_length = 0;
2078 u2 generic_signature_index = 0;
2079 MethodAnnotationCollector parsed_annotations;
2080 u1* runtime_visible_annotations = NULL;
2081 int runtime_visible_annotations_length = 0;
2082 u1* runtime_invisible_annotations = NULL;
2083 int runtime_invisible_annotations_length = 0;
2084 u1* runtime_visible_parameter_annotations = NULL;
2085 int runtime_visible_parameter_annotations_length = 0;
2086 u1* runtime_invisible_parameter_annotations = NULL;
2087 int runtime_invisible_parameter_annotations_length = 0;
2088 u1* runtime_visible_type_annotations = NULL;
2089 int runtime_visible_type_annotations_length = 0;
2090 u1* runtime_invisible_type_annotations = NULL;
2091 int runtime_invisible_type_annotations_length = 0;
2092 bool runtime_invisible_type_annotations_exists = false;
2093 u1* annotation_default = NULL;
2094 int annotation_default_length = 0;
2095
2096 // Parse code and exceptions attribute
2097 u2 method_attributes_count = cfs->get_u2_fast();
2098 while (method_attributes_count--) {
2099 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2100 u2 method_attribute_name_index = cfs->get_u2_fast();
2101 u4 method_attribute_length = cfs->get_u4_fast();
2102 check_property(
2103 valid_symbol_at(method_attribute_name_index),
2104 "Invalid method attribute name index %u in class file %s",
2105 method_attribute_name_index, CHECK_(nullHandle));
2106
2107 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2108 if (method_attribute_name == vmSymbols::tag_code()) {
2109 // Parse Code attribute
2110 if (_need_verify) {
2111 guarantee_property(
2112 !access_flags.is_native() && !access_flags.is_abstract(),
2113 "Code attribute in native or abstract methods in class file %s",
2114 CHECK_(nullHandle));
2115 }
2116 if (parsed_code_attribute) {
2117 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2118 }
2119 parsed_code_attribute = true;
2120
2121 // Stack size, locals size, and code size
2122 if (_major_version == 45 && _minor_version <= 2) {
2123 cfs->guarantee_more(4, CHECK_(nullHandle));
2124 max_stack = cfs->get_u1_fast();
2125 max_locals = cfs->get_u1_fast();
2126 code_length = cfs->get_u2_fast();
2127 } else {
2128 cfs->guarantee_more(8, CHECK_(nullHandle));
2129 max_stack = cfs->get_u2_fast();
2130 max_locals = cfs->get_u2_fast();
2131 code_length = cfs->get_u4_fast();
2132 }
2133 if (_need_verify) {
2134 guarantee_property(args_size <= max_locals,
2135 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2136 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2137 "Invalid method Code length %u in class file %s",
2138 code_length, CHECK_(nullHandle));
2139 }
2140 // Code pointer
2141 code_start = cfs->get_u1_buffer();
2142 assert(code_start != NULL, "null code start");
2143 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2144 cfs->skip_u1_fast(code_length);
2145
2146 // Exception handler table
2147 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2148 exception_table_length = cfs->get_u2_fast();
2149 if (exception_table_length > 0) {
2150 exception_table_start =
2151 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2152 }
2153
2154 // Parse additional attributes in code attribute
2155 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2156 u2 code_attributes_count = cfs->get_u2_fast();
2157
2158 unsigned int calculated_attribute_length = 0;
2159
2160 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2161 calculated_attribute_length =
2162 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2163 } else {
2164 // max_stack, locals and length are smaller in pre-version 45.2 classes
2165 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2166 }
2167 calculated_attribute_length +=
2168 code_length +
2169 sizeof(exception_table_length) +
2170 sizeof(code_attributes_count) +
2171 exception_table_length *
2172 ( sizeof(u2) + // start_pc
2173 sizeof(u2) + // end_pc
2174 sizeof(u2) + // handler_pc
2175 sizeof(u2) ); // catch_type_index
2176
2177 while (code_attributes_count--) {
2178 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2179 u2 code_attribute_name_index = cfs->get_u2_fast();
2180 u4 code_attribute_length = cfs->get_u4_fast();
2181 calculated_attribute_length += code_attribute_length +
2182 sizeof(code_attribute_name_index) +
2183 sizeof(code_attribute_length);
2184 check_property(valid_symbol_at(code_attribute_name_index),
2185 "Invalid code attribute name index %u in class file %s",
2186 code_attribute_name_index,
2187 CHECK_(nullHandle));
2188 if (LoadLineNumberTables &&
2189 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2190 // Parse and compress line number table
2191 parse_linenumber_table(code_attribute_length, code_length,
2192 &linenumber_table, CHECK_(nullHandle));
2193
2194 } else if (LoadLocalVariableTables &&
2195 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2196 // Parse local variable table
2197 if (!lvt_allocated) {
2198 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2199 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2200 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2201 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2202 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2203 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2204 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2206 lvt_allocated = true;
2207 }
2208 if (lvt_cnt == max_lvt_cnt) {
2209 max_lvt_cnt <<= 1;
2210 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2211 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2212 }
2213 localvariable_table_start[lvt_cnt] =
2214 parse_localvariable_table(code_length,
2215 max_locals,
2216 code_attribute_length,
2217 &localvariable_table_length[lvt_cnt],
2218 false, // is not LVTT
2219 CHECK_(nullHandle));
2220 total_lvt_length += localvariable_table_length[lvt_cnt];
2221 lvt_cnt++;
2222 } else if (LoadLocalVariableTypeTables &&
2223 _major_version >= JAVA_1_5_VERSION &&
2224 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2225 if (!lvt_allocated) {
2226 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2227 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2228 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2229 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2230 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2231 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2232 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2233 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2234 lvt_allocated = true;
2235 }
2236 // Parse local variable type table
2237 if (lvtt_cnt == max_lvtt_cnt) {
2238 max_lvtt_cnt <<= 1;
2239 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2240 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2241 }
2242 localvariable_type_table_start[lvtt_cnt] =
2243 parse_localvariable_table(code_length,
2244 max_locals,
2245 code_attribute_length,
2246 &localvariable_type_table_length[lvtt_cnt],
2247 true, // is LVTT
2248 CHECK_(nullHandle));
2249 lvtt_cnt++;
2250 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2251 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2252 // Stack map is only needed by the new verifier in JDK1.5.
2253 if (parsed_stackmap_attribute) {
2254 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2255 }
2256 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2257 stackmap_data_length = code_attribute_length;
2258 parsed_stackmap_attribute = true;
2259 } else {
2260 // Skip unknown attributes
2261 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2262 }
2263 }
2264 // check method attribute length
2265 if (_need_verify) {
2266 guarantee_property(method_attribute_length == calculated_attribute_length,
2267 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2268 }
2269 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2270 // Parse Exceptions attribute
2271 if (parsed_checked_exceptions_attribute) {
2272 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2273 }
2274 parsed_checked_exceptions_attribute = true;
2275 checked_exceptions_start =
2276 parse_checked_exceptions(&checked_exceptions_length,
2277 method_attribute_length,
2278 CHECK_(nullHandle));
2279 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2280 // reject multiple method parameters
2281 if (method_parameters_seen) {
2282 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2283 }
2284 method_parameters_seen = true;
2285 method_parameters_length = cfs->get_u1_fast();
2286 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2287 classfile_parse_error(
2288 "Invalid MethodParameters method attribute length %u in class file",
2289 method_attribute_length, CHECK_(nullHandle));
2290 }
2291 method_parameters_data = cfs->get_u1_buffer();
2292 cfs->skip_u2_fast(method_parameters_length);
2293 cfs->skip_u2_fast(method_parameters_length);
2294 // ignore this attribute if it cannot be reflected
2295 if (!SystemDictionary::Parameter_klass_loaded())
2296 method_parameters_length = 0;
2297 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2298 if (method_attribute_length != 0) {
2299 classfile_parse_error(
2300 "Invalid Synthetic method attribute length %u in class file %s",
2301 method_attribute_length, CHECK_(nullHandle));
2302 }
2303 // Should we check that there hasn't already been a synthetic attribute?
2304 access_flags.set_is_synthetic();
2305 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2306 if (method_attribute_length != 0) {
2307 classfile_parse_error(
2308 "Invalid Deprecated method attribute length %u in class file %s",
2309 method_attribute_length, CHECK_(nullHandle));
2310 }
2311 } else if (_major_version >= JAVA_1_5_VERSION) {
2312 if (method_attribute_name == vmSymbols::tag_signature()) {
2313 if (method_attribute_length != 2) {
2314 classfile_parse_error(
2315 "Invalid Signature attribute length %u in class file %s",
2316 method_attribute_length, CHECK_(nullHandle));
2317 }
2318 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2319 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2320 runtime_visible_annotations_length = method_attribute_length;
2321 runtime_visible_annotations = cfs->get_u1_buffer();
2322 assert(runtime_visible_annotations != NULL, "null visible annotations");
2323 parse_annotations(runtime_visible_annotations,
2324 runtime_visible_annotations_length, &parsed_annotations,
2325 CHECK_(nullHandle));
2326 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2327 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2328 runtime_invisible_annotations_length = method_attribute_length;
2329 runtime_invisible_annotations = cfs->get_u1_buffer();
2330 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2331 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2332 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2333 runtime_visible_parameter_annotations_length = method_attribute_length;
2334 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2335 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2336 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2337 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2338 runtime_invisible_parameter_annotations_length = method_attribute_length;
2339 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2340 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2341 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2342 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2343 annotation_default_length = method_attribute_length;
2344 annotation_default = cfs->get_u1_buffer();
2345 assert(annotation_default != NULL, "null annotation default");
2346 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2347 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2348 if (runtime_visible_type_annotations != NULL) {
2349 classfile_parse_error(
2350 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2351 CHECK_(nullHandle));
2352 }
2353 runtime_visible_type_annotations_length = method_attribute_length;
2354 runtime_visible_type_annotations = cfs->get_u1_buffer();
2355 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2356 // No need for the VM to parse Type annotations
2357 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2358 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2359 if (runtime_invisible_type_annotations_exists) {
2360 classfile_parse_error(
2361 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2362 CHECK_(nullHandle));
2363 } else {
2364 runtime_invisible_type_annotations_exists = true;
2365 }
2366 if (PreserveAllAnnotations) {
2367 runtime_invisible_type_annotations_length = method_attribute_length;
2368 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2369 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2370 }
2371 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2372 } else {
2373 // Skip unknown attributes
2374 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2375 }
2376 } else {
2377 // Skip unknown attributes
2378 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2379 }
2380 }
2381
2382 if (linenumber_table != NULL) {
2383 linenumber_table->write_terminator();
2384 linenumber_table_length = linenumber_table->position();
2385 }
2386
2387 // Make sure there's at least one Code attribute in non-native/non-abstract method
2388 if (_need_verify) {
2389 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2390 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2391 }
2392
2393 // All sizing information for a Method* is finally available, now create it
2394 InlineTableSizes sizes(
2395 total_lvt_length,
2396 linenumber_table_length,
2397 exception_table_length,
2398 checked_exceptions_length,
2399 method_parameters_length,
2400 generic_signature_index,
2401 runtime_visible_annotations_length +
2402 runtime_invisible_annotations_length,
2403 runtime_visible_parameter_annotations_length +
2404 runtime_invisible_parameter_annotations_length,
2405 runtime_visible_type_annotations_length +
2406 runtime_invisible_type_annotations_length,
2407 annotation_default_length,
2408 0);
2409
2410 Method* m = Method::allocate(
2411 _loader_data, code_length, access_flags, &sizes,
2412 ConstMethod::NORMAL, CHECK_(nullHandle));
2413
2414 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2415
2416 // Fill in information from fixed part (access_flags already set)
2417 m->set_constants(_cp);
2418 m->set_name_index(name_index);
2419 m->set_signature_index(signature_index);
2420 #ifdef CC_INTERP
2421 // hmm is there a gc issue here??
2422 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2423 m->set_result_index(rtf.type());
2424 #endif
2425
2426 if (args_size >= 0) {
2427 m->set_size_of_parameters(args_size);
2428 } else {
2429 m->compute_size_of_parameters(THREAD);
2430 }
2431 #ifdef ASSERT
2432 if (args_size >= 0) {
2433 m->compute_size_of_parameters(THREAD);
2434 assert(args_size == m->size_of_parameters(), "");
2435 }
2436 #endif
2437
2438 // Fill in code attribute information
2439 m->set_max_stack(max_stack);
2440 m->set_max_locals(max_locals);
2441 if (stackmap_data != NULL) {
2442 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2443 stackmap_data_length, CHECK_NULL);
2444 }
2445
2446 // Copy byte codes
2447 m->set_code(code_start);
2448
2449 // Copy line number table
2450 if (linenumber_table != NULL) {
2451 memcpy(m->compressed_linenumber_table(),
2452 linenumber_table->buffer(), linenumber_table_length);
2453 }
2454
2455 // Copy exception table
2456 if (exception_table_length > 0) {
2457 int size =
2458 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2459 copy_u2_with_conversion((u2*) m->exception_table_start(),
2460 exception_table_start, size);
2461 }
2462
2463 // Copy method parameters
2464 if (method_parameters_length > 0) {
2465 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2466 for (int i = 0; i < method_parameters_length; i++) {
2467 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2468 method_parameters_data += 2;
2469 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2470 method_parameters_data += 2;
2471 }
2472 }
2473
2474 // Copy checked exceptions
2475 if (checked_exceptions_length > 0) {
2476 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2477 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2478 }
2479
2480 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2481 if (total_lvt_length > 0) {
2482 promoted_flags->set_has_localvariable_table();
2483 copy_localvariable_table(m->constMethod(), lvt_cnt,
2484 localvariable_table_length,
2485 localvariable_table_start,
2486 lvtt_cnt,
2487 localvariable_type_table_length,
2488 localvariable_type_table_start, CHECK_NULL);
2489 }
2490
2491 if (parsed_annotations.has_any_annotations())
2492 parsed_annotations.apply_to(m);
2493
2494 // Copy annotations
2495 copy_method_annotations(m->constMethod(),
2496 runtime_visible_annotations,
2497 runtime_visible_annotations_length,
2498 runtime_invisible_annotations,
2499 runtime_invisible_annotations_length,
2500 runtime_visible_parameter_annotations,
2501 runtime_visible_parameter_annotations_length,
2502 runtime_invisible_parameter_annotations,
2503 runtime_invisible_parameter_annotations_length,
2504 runtime_visible_type_annotations,
2505 runtime_visible_type_annotations_length,
2506 runtime_invisible_type_annotations,
2507 runtime_invisible_type_annotations_length,
2508 annotation_default,
2509 annotation_default_length,
2510 CHECK_NULL);
2511
2512 if (name == vmSymbols::finalize_method_name() &&
2513 signature == vmSymbols::void_method_signature()) {
2514 if (m->is_empty_method()) {
2515 _has_empty_finalizer = true;
2516 } else {
2517 _has_finalizer = true;
2518 }
2519 }
2520 if (name == vmSymbols::object_initializer_name() &&
2521 signature == vmSymbols::void_method_signature() &&
2522 m->is_vanilla_constructor()) {
2523 _has_vanilla_constructor = true;
2524 }
2525
2526 NOT_PRODUCT(m->verify());
2527 return m;
2528 }
2529
2530
2531 // The promoted_flags parameter is used to pass relevant access_flags
2532 // from the methods back up to the containing klass. These flag values
2533 // are added to klass's access_flags.
2534
2535 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2536 AccessFlags* promoted_flags,
2537 bool* has_final_method,
2538 bool* declares_default_methods,
2539 TRAPS) {
2540 ClassFileStream* cfs = stream();
2541 cfs->guarantee_more(2, CHECK_NULL); // length
2542 u2 length = cfs->get_u2_fast();
2543 if (length == 0) {
2544 _methods = Universe::the_empty_method_array();
2545 } else {
2546 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2547
2548 HandleMark hm(THREAD);
2549 for (int index = 0; index < length; index++) {
2550 methodHandle method = parse_method(is_interface,
2551 promoted_flags,
2552 CHECK_NULL);
2553
2554 if (method->is_final()) {
2555 *has_final_method = true;
2556 }
2557 // declares_default_methods: declares concrete instance methods, any access flags
2558 // used for interface initialization, and default method inheritance analysis
2559 if (is_interface && !(*declares_default_methods)
2560 && !method->is_abstract() && !method->is_static()) {
2561 *declares_default_methods = true;
2562 }
2563 _methods->at_put(index, method());
2564 }
2565
2566 if (_need_verify && length > 1) {
2567 // Check duplicated methods
2568 ResourceMark rm(THREAD);
2569 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2570 THREAD, NameSigHash*, HASH_ROW_SIZE);
2571 initialize_hashtable(names_and_sigs);
2572 bool dup = false;
2573 {
2574 debug_only(No_Safepoint_Verifier nsv;)
2575 for (int i = 0; i < length; i++) {
2576 Method* m = _methods->at(i);
2577 // If no duplicates, add name/signature in hashtable names_and_sigs.
2578 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2579 dup = true;
2580 break;
2581 }
2582 }
2583 }
2584 if (dup) {
2585 classfile_parse_error("Duplicate method name&signature in class file %s",
2586 CHECK_NULL);
2587 }
2588 }
2589 }
2590 return _methods;
2591 }
2592
2593
2594 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2595 int length = methods->length();
2596 // If JVMTI original method ordering or sharing is enabled we have to
2597 // remember the original class file ordering.
2598 // We temporarily use the vtable_index field in the Method* to store the
2599 // class file index, so we can read in after calling qsort.
2600 // Put the method ordering in the shared archive.
2601 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2602 for (int index = 0; index < length; index++) {
2603 Method* m = methods->at(index);
2604 assert(!m->valid_vtable_index(), "vtable index should not be set");
2605 m->set_vtable_index(index);
2606 }
2607 }
2608 // Sort method array by ascending method name (for faster lookups & vtable construction)
2609 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2610 Method::sort_methods(methods);
2611
2612 intArray* method_ordering = NULL;
2613 // If JVMTI original method ordering or sharing is enabled construct int
2614 // array remembering the original ordering
2615 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2616 method_ordering = new intArray(length);
2617 for (int index = 0; index < length; index++) {
2618 Method* m = methods->at(index);
2619 int old_index = m->vtable_index();
2620 assert(old_index >= 0 && old_index < length, "invalid method index");
2621 method_ordering->at_put(index, old_index);
2622 m->set_vtable_index(Method::invalid_vtable_index);
2623 }
2624 }
2625 return method_ordering;
2626 }
2627
2628 // Parse generic_signature attribute for methods and fields
2629 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2630 ClassFileStream* cfs = stream();
2631 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2632 u2 generic_signature_index = cfs->get_u2_fast();
2633 check_property(
2634 valid_symbol_at(generic_signature_index),
2635 "Invalid Signature attribute at constant pool index %u in class file %s",
2636 generic_signature_index, CHECK_0);
2637 return generic_signature_index;
2638 }
2639
2640 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2641 ClassFileStream* cfs = stream();
2642 cfs->guarantee_more(2, CHECK); // sourcefile_index
2643 u2 sourcefile_index = cfs->get_u2_fast();
2644 check_property(
2645 valid_symbol_at(sourcefile_index),
2646 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2647 sourcefile_index, CHECK);
2648 set_class_sourcefile_index(sourcefile_index);
2649 }
2650
2651
2652
2653 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2654 ClassFileStream* cfs = stream();
2655 u1* sde_buffer = cfs->get_u1_buffer();
2656 assert(sde_buffer != NULL, "null sde buffer");
2657
2658 // Don't bother storing it if there is no way to retrieve it
2659 if (JvmtiExport::can_get_source_debug_extension()) {
2660 assert((length+1) > length, "Overflow checking");
2661 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2662 for (int i = 0; i < length; i++) {
2663 sde[i] = sde_buffer[i];
2664 }
2665 sde[length] = '\0';
2666 set_class_sde_buffer((char*)sde, length);
2667 }
2668 // Got utf8 string, set stream position forward
2669 cfs->skip_u1(length, CHECK);
2670 }
2671
2672
2673 // Inner classes can be static, private or protected (classic VM does this)
2674 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2675
2676 // Return number of classes in the inner classes attribute table
2677 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2678 bool parsed_enclosingmethod_attribute,
2679 u2 enclosing_method_class_index,
2680 u2 enclosing_method_method_index,
2681 TRAPS) {
2682 ClassFileStream* cfs = stream();
2683 u1* current_mark = cfs->current();
2684 u2 length = 0;
2685 if (inner_classes_attribute_start != NULL) {
2686 cfs->set_current(inner_classes_attribute_start);
2687 cfs->guarantee_more(2, CHECK_0); // length
2688 length = cfs->get_u2_fast();
2689 }
2690
2691 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2692 // method data:
2693 // [inner_class_info_index,
2694 // outer_class_info_index,
2695 // inner_name_index,
2696 // inner_class_access_flags,
2697 // ...
2698 // enclosing_method_class_index,
2699 // enclosing_method_method_index]
2700 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2701 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2702 _inner_classes = inner_classes;
2703
2704 int index = 0;
2705 int cp_size = _cp->length();
2706 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2707 for (int n = 0; n < length; n++) {
2708 // Inner class index
2709 u2 inner_class_info_index = cfs->get_u2_fast();
2710 check_property(
2711 inner_class_info_index == 0 ||
2712 valid_klass_reference_at(inner_class_info_index),
2713 "inner_class_info_index %u has bad constant type in class file %s",
2714 inner_class_info_index, CHECK_0);
2715 // Outer class index
2716 u2 outer_class_info_index = cfs->get_u2_fast();
2717 check_property(
2718 outer_class_info_index == 0 ||
2719 valid_klass_reference_at(outer_class_info_index),
2720 "outer_class_info_index %u has bad constant type in class file %s",
2721 outer_class_info_index, CHECK_0);
2722 // Inner class name
2723 u2 inner_name_index = cfs->get_u2_fast();
2724 check_property(
2725 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2726 "inner_name_index %u has bad constant type in class file %s",
2727 inner_name_index, CHECK_0);
2728 if (_need_verify) {
2729 guarantee_property(inner_class_info_index != outer_class_info_index,
2730 "Class is both outer and inner class in class file %s", CHECK_0);
2731 }
2732 // Access flags
2733 AccessFlags inner_access_flags;
2734 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2735 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2736 // Set abstract bit for old class files for backward compatibility
2737 flags |= JVM_ACC_ABSTRACT;
2738 }
2739 verify_legal_class_modifiers(flags, CHECK_0);
2740 inner_access_flags.set_flags(flags);
2741
2742 inner_classes->at_put(index++, inner_class_info_index);
2743 inner_classes->at_put(index++, outer_class_info_index);
2744 inner_classes->at_put(index++, inner_name_index);
2745 inner_classes->at_put(index++, inner_access_flags.as_short());
2746 }
2747
2748 // 4347400: make sure there's no duplicate entry in the classes array
2749 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2750 for(int i = 0; i < length * 4; i += 4) {
2751 for(int j = i + 4; j < length * 4; j += 4) {
2752 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2753 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2754 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2755 inner_classes->at(i+3) != inner_classes->at(j+3)),
2756 "Duplicate entry in InnerClasses in class file %s",
2757 CHECK_0);
2758 }
2759 }
2760 }
2761
2762 // Set EnclosingMethod class and method indexes.
2763 if (parsed_enclosingmethod_attribute) {
2764 inner_classes->at_put(index++, enclosing_method_class_index);
2765 inner_classes->at_put(index++, enclosing_method_method_index);
2766 }
2767 assert(index == size, "wrong size");
2768
2769 // Restore buffer's current position.
2770 cfs->set_current(current_mark);
2771
2772 return length;
2773 }
2774
2775 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2776 set_class_synthetic_flag(true);
2777 }
2778
2779 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2780 ClassFileStream* cfs = stream();
2781 u2 signature_index = cfs->get_u2(CHECK);
2782 check_property(
2783 valid_symbol_at(signature_index),
2784 "Invalid constant pool index %u in Signature attribute in class file %s",
2785 signature_index, CHECK);
2786 set_class_generic_signature_index(signature_index);
2787 }
2788
2789 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2790 ClassFileStream* cfs = stream();
2791 u1* current_start = cfs->current();
2792
2793 guarantee_property(attribute_byte_length >= sizeof(u2),
2794 "Invalid BootstrapMethods attribute length %u in class file %s",
2795 attribute_byte_length,
2796 CHECK);
2797
2798 cfs->guarantee_more(attribute_byte_length, CHECK);
2799
2800 int attribute_array_length = cfs->get_u2_fast();
2801
2802 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2803 "Short length on BootstrapMethods in class file %s",
2804 CHECK);
2805
2806 // The attribute contains a counted array of counted tuples of shorts,
2807 // represending bootstrap specifiers:
2808 // length*{bootstrap_method_index, argument_count*{argument_index}}
2809 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2810 // operand_count = number of shorts in attr, except for leading length
2811
2812 // The attribute is copied into a short[] array.
2813 // The array begins with a series of short[2] pairs, one for each tuple.
2814 int index_size = (attribute_array_length * 2);
2815
2816 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2817
2818 // Eagerly assign operands so they will be deallocated with the constant
2819 // pool if there is an error.
2820 _cp->set_operands(operands);
2821
2822 int operand_fill_index = index_size;
2823 int cp_size = _cp->length();
2824
2825 for (int n = 0; n < attribute_array_length; n++) {
2826 // Store a 32-bit offset into the header of the operand array.
2827 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2828
2829 // Read a bootstrap specifier.
2830 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2831 u2 bootstrap_method_index = cfs->get_u2_fast();
2832 u2 argument_count = cfs->get_u2_fast();
2833 check_property(
2834 valid_cp_range(bootstrap_method_index, cp_size) &&
2835 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2836 "bootstrap_method_index %u has bad constant type in class file %s",
2837 bootstrap_method_index,
2838 CHECK);
2839
2840 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2841 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2842 CHECK);
2843
2844 operands->at_put(operand_fill_index++, bootstrap_method_index);
2845 operands->at_put(operand_fill_index++, argument_count);
2846
2847 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2848 for (int j = 0; j < argument_count; j++) {
2849 u2 argument_index = cfs->get_u2_fast();
2850 check_property(
2851 valid_cp_range(argument_index, cp_size) &&
2852 _cp->tag_at(argument_index).is_loadable_constant(),
2853 "argument_index %u has bad constant type in class file %s",
2854 argument_index,
2855 CHECK);
2856 operands->at_put(operand_fill_index++, argument_index);
2857 }
2858 }
2859
2860 assert(operand_fill_index == operands->length(), "exact fill");
2861
2862 u1* current_end = cfs->current();
2863 guarantee_property(current_end == current_start + attribute_byte_length,
2864 "Bad length on BootstrapMethods in class file %s",
2865 CHECK);
2866 }
2867
2868 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2869 TRAPS) {
2870 ClassFileStream* cfs = stream();
2871 // Set inner classes attribute to default sentinel
2872 _inner_classes = Universe::the_empty_short_array();
2873 cfs->guarantee_more(2, CHECK); // attributes_count
2874 u2 attributes_count = cfs->get_u2_fast();
2875 bool parsed_sourcefile_attribute = false;
2876 bool parsed_innerclasses_attribute = false;
2877 bool parsed_enclosingmethod_attribute = false;
2878 bool parsed_bootstrap_methods_attribute = false;
2879 u1* runtime_visible_annotations = NULL;
2880 int runtime_visible_annotations_length = 0;
2881 u1* runtime_invisible_annotations = NULL;
2882 int runtime_invisible_annotations_length = 0;
2883 u1* runtime_visible_type_annotations = NULL;
2884 int runtime_visible_type_annotations_length = 0;
2885 u1* runtime_invisible_type_annotations = NULL;
2886 int runtime_invisible_type_annotations_length = 0;
2887 bool runtime_invisible_type_annotations_exists = false;
2888 u1* inner_classes_attribute_start = NULL;
2889 u4 inner_classes_attribute_length = 0;
2890 u2 enclosing_method_class_index = 0;
2891 u2 enclosing_method_method_index = 0;
2892 // Iterate over attributes
2893 while (attributes_count--) {
2894 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2895 u2 attribute_name_index = cfs->get_u2_fast();
2896 u4 attribute_length = cfs->get_u4_fast();
2897 check_property(
2898 valid_symbol_at(attribute_name_index),
2899 "Attribute name has bad constant pool index %u in class file %s",
2900 attribute_name_index, CHECK);
2901 Symbol* tag = _cp->symbol_at(attribute_name_index);
2902 if (tag == vmSymbols::tag_source_file()) {
2903 // Check for SourceFile tag
2904 if (_need_verify) {
2905 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2906 }
2907 if (parsed_sourcefile_attribute) {
2908 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2909 } else {
2910 parsed_sourcefile_attribute = true;
2911 }
2912 parse_classfile_sourcefile_attribute(CHECK);
2913 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2914 // Check for SourceDebugExtension tag
2915 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2916 } else if (tag == vmSymbols::tag_inner_classes()) {
2917 // Check for InnerClasses tag
2918 if (parsed_innerclasses_attribute) {
2919 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2920 } else {
2921 parsed_innerclasses_attribute = true;
2922 }
2923 inner_classes_attribute_start = cfs->get_u1_buffer();
2924 inner_classes_attribute_length = attribute_length;
2925 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2926 } else if (tag == vmSymbols::tag_synthetic()) {
2927 // Check for Synthetic tag
2928 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2929 if (attribute_length != 0) {
2930 classfile_parse_error(
2931 "Invalid Synthetic classfile attribute length %u in class file %s",
2932 attribute_length, CHECK);
2933 }
2934 parse_classfile_synthetic_attribute(CHECK);
2935 } else if (tag == vmSymbols::tag_deprecated()) {
2936 // Check for Deprecatd tag - 4276120
2937 if (attribute_length != 0) {
2938 classfile_parse_error(
2939 "Invalid Deprecated classfile attribute length %u in class file %s",
2940 attribute_length, CHECK);
2941 }
2942 } else if (_major_version >= JAVA_1_5_VERSION) {
2943 if (tag == vmSymbols::tag_signature()) {
2944 if (attribute_length != 2) {
2945 classfile_parse_error(
2946 "Wrong Signature attribute length %u in class file %s",
2947 attribute_length, CHECK);
2948 }
2949 parse_classfile_signature_attribute(CHECK);
2950 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2951 runtime_visible_annotations_length = attribute_length;
2952 runtime_visible_annotations = cfs->get_u1_buffer();
2953 assert(runtime_visible_annotations != NULL, "null visible annotations");
2954 parse_annotations(runtime_visible_annotations,
2955 runtime_visible_annotations_length,
2956 parsed_annotations,
2957 CHECK);
2958 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2959 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2960 runtime_invisible_annotations_length = attribute_length;
2961 runtime_invisible_annotations = cfs->get_u1_buffer();
2962 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2963 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2964 } else if (tag == vmSymbols::tag_enclosing_method()) {
2965 if (parsed_enclosingmethod_attribute) {
2966 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2967 } else {
2968 parsed_enclosingmethod_attribute = true;
2969 }
2970 cfs->guarantee_more(4, CHECK); // class_index, method_index
2971 enclosing_method_class_index = cfs->get_u2_fast();
2972 enclosing_method_method_index = cfs->get_u2_fast();
2973 if (enclosing_method_class_index == 0) {
2974 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2975 }
2976 // Validate the constant pool indices and types
2977 check_property(valid_klass_reference_at(enclosing_method_class_index),
2978 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2979 if (enclosing_method_method_index != 0 &&
2980 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2981 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2982 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2983 }
2984 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2985 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2986 if (parsed_bootstrap_methods_attribute)
2987 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2988 parsed_bootstrap_methods_attribute = true;
2989 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2990 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2991 if (runtime_visible_type_annotations != NULL) {
2992 classfile_parse_error(
2993 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
2994 }
2995 runtime_visible_type_annotations_length = attribute_length;
2996 runtime_visible_type_annotations = cfs->get_u1_buffer();
2997 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2998 // No need for the VM to parse Type annotations
2999 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3000 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3001 if (runtime_invisible_type_annotations_exists) {
3002 classfile_parse_error(
3003 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3004 } else {
3005 runtime_invisible_type_annotations_exists = true;
3006 }
3007 if (PreserveAllAnnotations) {
3008 runtime_invisible_type_annotations_length = attribute_length;
3009 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3010 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3011 }
3012 cfs->skip_u1(attribute_length, CHECK);
3013 } else {
3014 // Unknown attribute
3015 cfs->skip_u1(attribute_length, CHECK);
3016 }
3017 } else {
3018 // Unknown attribute
3019 cfs->skip_u1(attribute_length, CHECK);
3020 }
3021 }
3022 _annotations = assemble_annotations(runtime_visible_annotations,
3023 runtime_visible_annotations_length,
3024 runtime_invisible_annotations,
3025 runtime_invisible_annotations_length,
3026 CHECK);
3027 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3028 runtime_visible_type_annotations_length,
3029 runtime_invisible_type_annotations,
3030 runtime_invisible_type_annotations_length,
3031 CHECK);
3032
3033 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3034 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3035 inner_classes_attribute_start,
3036 parsed_innerclasses_attribute,
3037 enclosing_method_class_index,
3038 enclosing_method_method_index,
3039 CHECK);
3040 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3041 guarantee_property(
3042 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3043 "Wrong InnerClasses attribute length in class file %s", CHECK);
3044 }
3045 }
3046
3047 if (_max_bootstrap_specifier_index >= 0) {
3048 guarantee_property(parsed_bootstrap_methods_attribute,
3049 "Missing BootstrapMethods attribute in class file %s", CHECK);
3050 }
3051 }
3052
3053 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3054 if (_synthetic_flag)
3055 k->set_is_synthetic();
3056 if (_sourcefile_index != 0) {
3057 k->set_source_file_name_index(_sourcefile_index);
3058 }
3059 if (_generic_signature_index != 0) {
3060 k->set_generic_signature_index(_generic_signature_index);
3061 }
3062 if (_sde_buffer != NULL) {
3063 k->set_source_debug_extension(_sde_buffer, _sde_length);
3064 }
3065 }
3066
3067 // Create the Annotations object that will
3068 // hold the annotations array for the Klass.
3069 void ClassFileParser::create_combined_annotations(TRAPS) {
3070 if (_annotations == NULL &&
3071 _type_annotations == NULL &&
3072 _fields_annotations == NULL &&
3073 _fields_type_annotations == NULL) {
3074 // Don't create the Annotations object unnecessarily.
3075 return;
3076 }
3077
3078 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3079 annotations->set_class_annotations(_annotations);
3080 annotations->set_class_type_annotations(_type_annotations);
3081 annotations->set_fields_annotations(_fields_annotations);
3082 annotations->set_fields_type_annotations(_fields_type_annotations);
3083
3084 // This is the Annotations object that will be
3085 // assigned to InstanceKlass being constructed.
3086 _combined_annotations = annotations;
3087
3088 // The annotations arrays below has been transfered the
3089 // _combined_annotations so these fields can now be cleared.
3090 _annotations = NULL;
3091 _type_annotations = NULL;
3092 _fields_annotations = NULL;
3093 _fields_type_annotations = NULL;
3094 }
3095
3096 // Transfer ownership of metadata allocated to the InstanceKlass.
3097 void ClassFileParser::apply_parsed_class_metadata(
3098 instanceKlassHandle this_klass,
3099 int java_fields_count, TRAPS) {
3100 _cp->set_pool_holder(this_klass());
3101 this_klass->set_constants(_cp);
3102 this_klass->set_fields(_fields, java_fields_count);
3103 this_klass->set_methods(_methods);
3104 this_klass->set_inner_classes(_inner_classes);
3105 this_klass->set_local_interfaces(_local_interfaces);
3106 this_klass->set_transitive_interfaces(_transitive_interfaces);
3107 this_klass->set_annotations(_combined_annotations);
3108
3109 // Clear out these fields so they don't get deallocated by the destructor
3110 clear_class_metadata();
3111 }
3112
3113 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3114 int runtime_visible_annotations_length,
3115 u1* runtime_invisible_annotations,
3116 int runtime_invisible_annotations_length, TRAPS) {
3117 AnnotationArray* annotations = NULL;
3118 if (runtime_visible_annotations != NULL ||
3119 runtime_invisible_annotations != NULL) {
3120 annotations = MetadataFactory::new_array<u1>(_loader_data,
3121 runtime_visible_annotations_length +
3122 runtime_invisible_annotations_length,
3123 CHECK_(annotations));
3124 if (runtime_visible_annotations != NULL) {
3125 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3126 annotations->at_put(i, runtime_visible_annotations[i]);
3127 }
3128 }
3129 if (runtime_invisible_annotations != NULL) {
3130 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3131 int append = runtime_visible_annotations_length+i;
3132 annotations->at_put(append, runtime_invisible_annotations[i]);
3133 }
3134 }
3135 }
3136 return annotations;
3137 }
3138
3139 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3140 TRAPS) {
3141 instanceKlassHandle super_klass;
3142 if (super_class_index == 0) {
3143 check_property(_class_name == vmSymbols::java_lang_Object(),
3144 "Invalid superclass index %u in class file %s",
3145 super_class_index,
3146 CHECK_NULL);
3147 } else {
3148 check_property(valid_klass_reference_at(super_class_index),
3149 "Invalid superclass index %u in class file %s",
3150 super_class_index,
3151 CHECK_NULL);
3152 // The class name should be legal because it is checked when parsing constant pool.
3153 // However, make sure it is not an array type.
3154 bool is_array = false;
3155 if (_cp->tag_at(super_class_index).is_klass()) {
3156 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3157 if (_need_verify)
3158 is_array = super_klass->oop_is_array();
3159 } else if (_need_verify) {
3160 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3161 }
3162 if (_need_verify) {
3163 guarantee_property(!is_array,
3164 "Bad superclass name in class file %s", CHECK_NULL);
3165 }
3166 }
3167 return super_klass;
3168 }
3169
3170
3171 // Values needed for oopmap and InstanceKlass creation
3172 class FieldLayoutInfo : public StackObj {
3173 public:
3174 int* nonstatic_oop_offsets;
3175 unsigned int* nonstatic_oop_counts;
3176 unsigned int nonstatic_oop_map_count;
3177 unsigned int total_oop_map_count;
3178 int instance_size;
3179 int nonstatic_field_size;
3180 int static_field_size;
3181 bool has_nonstatic_fields;
3182 };
3183
3184 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3185 void ClassFileParser::layout_fields(Handle class_loader,
3186 FieldAllocationCount* fac,
3187 ClassAnnotationCollector* parsed_annotations,
3188 FieldLayoutInfo* info,
3189 TRAPS) {
3190
3191 // Field size and offset computation
3192 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3193 int next_static_oop_offset;
3194 int next_static_double_offset;
3195 int next_static_word_offset;
3196 int next_static_short_offset;
3197 int next_static_byte_offset;
3198 int next_nonstatic_oop_offset;
3199 int next_nonstatic_double_offset;
3200 int next_nonstatic_word_offset;
3201 int next_nonstatic_short_offset;
3202 int next_nonstatic_byte_offset;
3203 int first_nonstatic_oop_offset;
3204 int next_nonstatic_field_offset;
3205 int next_nonstatic_padded_offset;
3206
3207 // Count the contended fields by type.
3208 //
3209 // We ignore static fields, because @Contended is not supported for them.
3210 // The layout code below will also ignore the static fields.
3211 int nonstatic_contended_count = 0;
3212 FieldAllocationCount fac_contended;
3213 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3214 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3215 if (fs.is_contended()) {
3216 fac_contended.count[atype]++;
3217 if (!fs.access_flags().is_static()) {
3218 nonstatic_contended_count++;
3219 }
3220 }
3221 }
3222
3223
3224 // Calculate the starting byte offsets
3225 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3226 next_static_double_offset = next_static_oop_offset +
3227 ((fac->count[STATIC_OOP]) * heapOopSize);
3228 if ( fac->count[STATIC_DOUBLE] &&
3229 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3230 Universe::field_type_should_be_aligned(T_LONG)) ) {
3231 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3232 }
3233
3234 next_static_word_offset = next_static_double_offset +
3235 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3236 next_static_short_offset = next_static_word_offset +
3237 ((fac->count[STATIC_WORD]) * BytesPerInt);
3238 next_static_byte_offset = next_static_short_offset +
3239 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3240
3241 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3242 nonstatic_field_size * heapOopSize;
3243
3244 next_nonstatic_field_offset = nonstatic_fields_start;
3245
3246 bool is_contended_class = parsed_annotations->is_contended();
3247
3248 // Class is contended, pad before all the fields
3249 if (is_contended_class) {
3250 next_nonstatic_field_offset += ContendedPaddingWidth;
3251 }
3252
3253 // Compute the non-contended fields count.
3254 // The packing code below relies on these counts to determine if some field
3255 // can be squeezed into the alignment gap. Contended fields are obviously
3256 // exempt from that.
3257 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3258 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3259 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3260 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3261 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3262
3263 // Total non-static fields count, including every contended field
3264 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3265 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3266 fac->count[NONSTATIC_OOP];
3267
3268 bool super_has_nonstatic_fields =
3269 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3270 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3271
3272
3273 // Prepare list of oops for oop map generation.
3274 //
3275 // "offset" and "count" lists are describing the set of contiguous oop
3276 // regions. offset[i] is the start of the i-th region, which then has
3277 // count[i] oops following. Before we know how many regions are required,
3278 // we pessimistically allocate the maps to fit all the oops into the
3279 // distinct regions.
3280 //
3281 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3282 // to figure out if we still need to do this.
3283 int* nonstatic_oop_offsets;
3284 unsigned int* nonstatic_oop_counts;
3285 unsigned int nonstatic_oop_map_count = 0;
3286 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3287
3288 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3289 THREAD, int, max_nonstatic_oop_maps);
3290 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3291 THREAD, unsigned int, max_nonstatic_oop_maps);
3292
3293 first_nonstatic_oop_offset = 0; // will be set for first oop field
3294
3295 bool compact_fields = CompactFields;
3296 int allocation_style = FieldsAllocationStyle;
3297 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3298 assert(false, "0 <= FieldsAllocationStyle <= 2");
3299 allocation_style = 1; // Optimistic
3300 }
3301
3302 // The next classes have predefined hard-coded fields offsets
3303 // (see in JavaClasses::compute_hard_coded_offsets()).
3304 // Use default fields allocation order for them.
3305 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3306 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3307 _class_name == vmSymbols::java_lang_Class() ||
3308 _class_name == vmSymbols::java_lang_ClassLoader() ||
3309 _class_name == vmSymbols::java_lang_ref_Reference() ||
3310 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3311 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3312 _class_name == vmSymbols::java_lang_String() ||
3313 _class_name == vmSymbols::java_lang_Throwable() ||
3314 _class_name == vmSymbols::java_lang_Boolean() ||
3315 _class_name == vmSymbols::java_lang_Character() ||
3316 _class_name == vmSymbols::java_lang_Float() ||
3317 _class_name == vmSymbols::java_lang_Double() ||
3318 _class_name == vmSymbols::java_lang_Byte() ||
3319 _class_name == vmSymbols::java_lang_Short() ||
3320 _class_name == vmSymbols::java_lang_Integer() ||
3321 _class_name == vmSymbols::java_lang_Long())) {
3322 allocation_style = 0; // Allocate oops first
3323 compact_fields = false; // Don't compact fields
3324 }
3325
3326 // Rearrange fields for a given allocation style
3327 if( allocation_style == 0 ) {
3328 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3329 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3330 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3331 (nonstatic_oop_count * heapOopSize);
3332 } else if( allocation_style == 1 ) {
3333 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3334 next_nonstatic_double_offset = next_nonstatic_field_offset;
3335 } else if( allocation_style == 2 ) {
3336 // Fields allocation: oops fields in super and sub classes are together.
3337 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3338 _super_klass->nonstatic_oop_map_size() > 0 ) {
3339 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3340 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3341 OopMapBlock* last_map = first_map + map_count - 1;
3342 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3343 if (next_offset == next_nonstatic_field_offset) {
3344 allocation_style = 0; // allocate oops first
3345 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3346 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3347 (nonstatic_oop_count * heapOopSize);
3348 }
3349 }
3350 if( allocation_style == 2 ) {
3351 allocation_style = 1; // allocate oops last
3352 next_nonstatic_double_offset = next_nonstatic_field_offset;
3353 }
3354 } else {
3355 ShouldNotReachHere();
3356 }
3357
3358 int nonstatic_oop_space_count = 0;
3359 int nonstatic_word_space_count = 0;
3360 int nonstatic_short_space_count = 0;
3361 int nonstatic_byte_space_count = 0;
3362 int nonstatic_oop_space_offset;
3363 int nonstatic_word_space_offset;
3364 int nonstatic_short_space_offset;
3365 int nonstatic_byte_space_offset;
3366
3367 // Try to squeeze some of the fields into the gaps due to
3368 // long/double alignment.
3369 if( nonstatic_double_count > 0 ) {
3370 int offset = next_nonstatic_double_offset;
3371 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3372 if( compact_fields && offset != next_nonstatic_double_offset ) {
3373 // Allocate available fields into the gap before double field.
3374 int length = next_nonstatic_double_offset - offset;
3375 assert(length == BytesPerInt, "");
3376 nonstatic_word_space_offset = offset;
3377 if( nonstatic_word_count > 0 ) {
3378 nonstatic_word_count -= 1;
3379 nonstatic_word_space_count = 1; // Only one will fit
3380 length -= BytesPerInt;
3381 offset += BytesPerInt;
3382 }
3383 nonstatic_short_space_offset = offset;
3384 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3385 nonstatic_short_count -= 1;
3386 nonstatic_short_space_count += 1;
3387 length -= BytesPerShort;
3388 offset += BytesPerShort;
3389 }
3390 nonstatic_byte_space_offset = offset;
3391 while( length > 0 && nonstatic_byte_count > 0 ) {
3392 nonstatic_byte_count -= 1;
3393 nonstatic_byte_space_count += 1;
3394 length -= 1;
3395 }
3396 // Allocate oop field in the gap if there are no other fields for that.
3397 nonstatic_oop_space_offset = offset;
3398 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3399 allocation_style != 0 ) { // when oop fields not first
3400 nonstatic_oop_count -= 1;
3401 nonstatic_oop_space_count = 1; // Only one will fit
3402 length -= heapOopSize;
3403 offset += heapOopSize;
3404 }
3405 }
3406 }
3407
3408 next_nonstatic_word_offset = next_nonstatic_double_offset +
3409 (nonstatic_double_count * BytesPerLong);
3410 next_nonstatic_short_offset = next_nonstatic_word_offset +
3411 (nonstatic_word_count * BytesPerInt);
3412 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3413 (nonstatic_short_count * BytesPerShort);
3414 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3415 nonstatic_byte_count;
3416
3417 // let oops jump before padding with this allocation style
3418 if( allocation_style == 1 ) {
3419 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3420 if( nonstatic_oop_count > 0 ) {
3421 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3422 }
3423 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3424 }
3425
3426 // Iterate over fields again and compute correct offsets.
3427 // The field allocation type was temporarily stored in the offset slot.
3428 // oop fields are located before non-oop fields (static and non-static).
3429 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3430
3431 // skip already laid out fields
3432 if (fs.is_offset_set()) continue;
3433
3434 // contended instance fields are handled below
3435 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3436
3437 int real_offset;
3438 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3439
3440 // pack the rest of the fields
3441 switch (atype) {
3442 case STATIC_OOP:
3443 real_offset = next_static_oop_offset;
3444 next_static_oop_offset += heapOopSize;
3445 break;
3446 case STATIC_BYTE:
3447 real_offset = next_static_byte_offset;
3448 next_static_byte_offset += 1;
3449 break;
3450 case STATIC_SHORT:
3451 real_offset = next_static_short_offset;
3452 next_static_short_offset += BytesPerShort;
3453 break;
3454 case STATIC_WORD:
3455 real_offset = next_static_word_offset;
3456 next_static_word_offset += BytesPerInt;
3457 break;
3458 case STATIC_DOUBLE:
3459 real_offset = next_static_double_offset;
3460 next_static_double_offset += BytesPerLong;
3461 break;
3462 case NONSTATIC_OOP:
3463 if( nonstatic_oop_space_count > 0 ) {
3464 real_offset = nonstatic_oop_space_offset;
3465 nonstatic_oop_space_offset += heapOopSize;
3466 nonstatic_oop_space_count -= 1;
3467 } else {
3468 real_offset = next_nonstatic_oop_offset;
3469 next_nonstatic_oop_offset += heapOopSize;
3470 }
3471 // Update oop maps
3472 if( nonstatic_oop_map_count > 0 &&
3473 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3474 real_offset -
3475 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3476 heapOopSize ) {
3477 // Extend current oop map
3478 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3479 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3480 } else {
3481 // Create new oop map
3482 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3483 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3484 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3485 nonstatic_oop_map_count += 1;
3486 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3487 first_nonstatic_oop_offset = real_offset;
3488 }
3489 }
3490 break;
3491 case NONSTATIC_BYTE:
3492 if( nonstatic_byte_space_count > 0 ) {
3493 real_offset = nonstatic_byte_space_offset;
3494 nonstatic_byte_space_offset += 1;
3495 nonstatic_byte_space_count -= 1;
3496 } else {
3497 real_offset = next_nonstatic_byte_offset;
3498 next_nonstatic_byte_offset += 1;
3499 }
3500 break;
3501 case NONSTATIC_SHORT:
3502 if( nonstatic_short_space_count > 0 ) {
3503 real_offset = nonstatic_short_space_offset;
3504 nonstatic_short_space_offset += BytesPerShort;
3505 nonstatic_short_space_count -= 1;
3506 } else {
3507 real_offset = next_nonstatic_short_offset;
3508 next_nonstatic_short_offset += BytesPerShort;
3509 }
3510 break;
3511 case NONSTATIC_WORD:
3512 if( nonstatic_word_space_count > 0 ) {
3513 real_offset = nonstatic_word_space_offset;
3514 nonstatic_word_space_offset += BytesPerInt;
3515 nonstatic_word_space_count -= 1;
3516 } else {
3517 real_offset = next_nonstatic_word_offset;
3518 next_nonstatic_word_offset += BytesPerInt;
3519 }
3520 break;
3521 case NONSTATIC_DOUBLE:
3522 real_offset = next_nonstatic_double_offset;
3523 next_nonstatic_double_offset += BytesPerLong;
3524 break;
3525 default:
3526 ShouldNotReachHere();
3527 }
3528 fs.set_offset(real_offset);
3529 }
3530
3531
3532 // Handle the contended cases.
3533 //
3534 // Each contended field should not intersect the cache line with another contended field.
3535 // In the absence of alignment information, we end up with pessimistically separating
3536 // the fields with full-width padding.
3537 //
3538 // Additionally, this should not break alignment for the fields, so we round the alignment up
3539 // for each field.
3540 if (nonstatic_contended_count > 0) {
3541
3542 // if there is at least one contended field, we need to have pre-padding for them
3543 next_nonstatic_padded_offset += ContendedPaddingWidth;
3544
3545 // collect all contended groups
3546 BitMap bm(_cp->size());
3547 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3548 // skip already laid out fields
3549 if (fs.is_offset_set()) continue;
3550
3551 if (fs.is_contended()) {
3552 bm.set_bit(fs.contended_group());
3553 }
3554 }
3555
3556 int current_group = -1;
3557 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3558
3559 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3560
3561 // skip already laid out fields
3562 if (fs.is_offset_set()) continue;
3563
3564 // skip non-contended fields and fields from different group
3565 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3566
3567 // handle statics below
3568 if (fs.access_flags().is_static()) continue;
3569
3570 int real_offset;
3571 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3572
3573 switch (atype) {
3574 case NONSTATIC_BYTE:
3575 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3576 real_offset = next_nonstatic_padded_offset;
3577 next_nonstatic_padded_offset += 1;
3578 break;
3579
3580 case NONSTATIC_SHORT:
3581 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3582 real_offset = next_nonstatic_padded_offset;
3583 next_nonstatic_padded_offset += BytesPerShort;
3584 break;
3585
3586 case NONSTATIC_WORD:
3587 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3588 real_offset = next_nonstatic_padded_offset;
3589 next_nonstatic_padded_offset += BytesPerInt;
3590 break;
3591
3592 case NONSTATIC_DOUBLE:
3593 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3594 real_offset = next_nonstatic_padded_offset;
3595 next_nonstatic_padded_offset += BytesPerLong;
3596 break;
3597
3598 case NONSTATIC_OOP:
3599 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3600 real_offset = next_nonstatic_padded_offset;
3601 next_nonstatic_padded_offset += heapOopSize;
3602
3603 // Create new oop map
3604 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3605 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3606 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3607 nonstatic_oop_map_count += 1;
3608 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3609 first_nonstatic_oop_offset = real_offset;
3610 }
3611 break;
3612
3613 default:
3614 ShouldNotReachHere();
3615 }
3616
3617 if (fs.contended_group() == 0) {
3618 // Contended group defines the equivalence class over the fields:
3619 // the fields within the same contended group are not inter-padded.
3620 // The only exception is default group, which does not incur the
3621 // equivalence, and so requires intra-padding.
3622 next_nonstatic_padded_offset += ContendedPaddingWidth;
3623 }
3624
3625 fs.set_offset(real_offset);
3626 } // for
3627
3628 // Start laying out the next group.
3629 // Note that this will effectively pad the last group in the back;
3630 // this is expected to alleviate memory contention effects for
3631 // subclass fields and/or adjacent object.
3632 // If this was the default group, the padding is already in place.
3633 if (current_group != 0) {
3634 next_nonstatic_padded_offset += ContendedPaddingWidth;
3635 }
3636 }
3637
3638 // handle static fields
3639 }
3640
3641 // Entire class is contended, pad in the back.
3642 // This helps to alleviate memory contention effects for subclass fields
3643 // and/or adjacent object.
3644 if (is_contended_class) {
3645 next_nonstatic_padded_offset += ContendedPaddingWidth;
3646 }
3647
3648 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3649
3650 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3651 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3652 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3653
3654 int static_field_size = (static_fields_end -
3655 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3656 nonstatic_field_size = nonstatic_field_size +
3657 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3658
3659 int instance_size = align_object_size(instance_end / wordSize);
3660
3661 assert(instance_size == align_object_size(align_size_up(
3662 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3663 wordSize) / wordSize), "consistent layout helper value");
3664
3665 // Invariant: nonstatic_field end/start should only change if there are
3666 // nonstatic fields in the class, or if the class is contended. We compare
3667 // against the non-aligned value, so that end alignment will not fail the
3668 // assert without actually having the fields.
3669 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3670 is_contended_class ||
3671 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3672
3673 // Number of non-static oop map blocks allocated at end of klass.
3674 const unsigned int total_oop_map_count =
3675 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3676 first_nonstatic_oop_offset);
3677
3678 #ifndef PRODUCT
3679 if (PrintFieldLayout) {
3680 print_field_layout(_class_name,
3681 _fields,
3682 _cp,
3683 instance_size,
3684 nonstatic_fields_start,
3685 nonstatic_fields_end,
3686 static_fields_end);
3687 }
3688
3689 #endif
3690 // Pass back information needed for InstanceKlass creation
3691 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3692 info->nonstatic_oop_counts = nonstatic_oop_counts;
3693 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3694 info->total_oop_map_count = total_oop_map_count;
3695 info->instance_size = instance_size;
3696 info->static_field_size = static_field_size;
3697 info->nonstatic_field_size = nonstatic_field_size;
3698 info->has_nonstatic_fields = has_nonstatic_fields;
3699 }
3700
3701
3702 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3703 ClassLoaderData* loader_data,
3704 Handle protection_domain,
3705 KlassHandle host_klass,
3706 GrowableArray<Handle>* cp_patches,
3707 TempNewSymbol& parsed_name,
3708 bool verify,
3709 TRAPS) {
3710
3711 // When a retransformable agent is attached, JVMTI caches the
3712 // class bytes that existed before the first retransformation.
3713 // If RedefineClasses() was used before the retransformable
3714 // agent attached, then the cached class bytes may not be the
3715 // original class bytes.
3716 JvmtiCachedClassFileData *cached_class_file = NULL;
3717 Handle class_loader(THREAD, loader_data->class_loader());
3718 bool has_default_methods = false;
3719 bool declares_default_methods = false;
3720 ResourceMark rm(THREAD);
3721
3722 ClassFileStream* cfs = stream();
3723 // Timing
3724 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3725 JavaThread* jt = (JavaThread*) THREAD;
3726
3727 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3728 ClassLoader::perf_class_parse_selftime(),
3729 NULL,
3730 jt->get_thread_stat()->perf_recursion_counts_addr(),
3731 jt->get_thread_stat()->perf_timers_addr(),
3732 PerfClassTraceTime::PARSE_CLASS);
3733
3734 init_parsed_class_attributes(loader_data);
3735
3736 if (JvmtiExport::should_post_class_file_load_hook()) {
3737 // Get the cached class file bytes (if any) from the class that
3738 // is being redefined or retransformed. We use jvmti_thread_state()
3739 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3740 // a JvmtiThreadState any earlier than necessary. This will help
3741 // avoid the bug described by 7126851.
3742 JvmtiThreadState *state = jt->jvmti_thread_state();
3743 if (state != NULL) {
3744 KlassHandle *h_class_being_redefined =
3745 state->get_class_being_redefined();
3746 if (h_class_being_redefined != NULL) {
3747 instanceKlassHandle ikh_class_being_redefined =
3748 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3749 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3750 }
3751 }
3752
3753 unsigned char* ptr = cfs->buffer();
3754 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3755
3756 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3757 &ptr, &end_ptr, &cached_class_file);
3758
3759 if (ptr != cfs->buffer()) {
3760 // JVMTI agent has modified class file data.
3761 // Set new class file stream using JVMTI agent modified
3762 // class file data.
3763 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3764 set_stream(cfs);
3765 }
3766 }
3767
3768 _host_klass = host_klass;
3769 _cp_patches = cp_patches;
3770
3771 instanceKlassHandle nullHandle;
3772
3773 // Figure out whether we can skip format checking (matching classic VM behavior)
3774 if (DumpSharedSpaces) {
3775 // verify == true means it's a 'remote' class (i.e., non-boot class)
3776 // Verification decision is based on BytecodeVerificationRemote flag
3777 // for those classes.
3778 _need_verify = (verify) ? BytecodeVerificationRemote :
3779 BytecodeVerificationLocal;
3780 } else {
3781 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3782 }
3783
3784 // Set the verify flag in stream
3785 cfs->set_verify(_need_verify);
3786
3787 // Save the class file name for easier error message printing.
3788 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3789
3790 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3791 // Magic value
3792 u4 magic = cfs->get_u4_fast();
3793 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3794 "Incompatible magic value %u in class file %s",
3795 magic, CHECK_(nullHandle));
3796
3797 // Version numbers
3798 u2 minor_version = cfs->get_u2_fast();
3799 u2 major_version = cfs->get_u2_fast();
3800
3801 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3802 ResourceMark rm;
3803 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3804 major_version, minor_version, name->as_C_string());
3805 Exceptions::fthrow(
3806 THREAD_AND_LOCATION,
3807 vmSymbols::java_lang_UnsupportedClassVersionError(),
3808 "Unsupported major.minor version for dump time %u.%u",
3809 major_version,
3810 minor_version);
3811 }
3812
3813 // Check version numbers - we check this even with verifier off
3814 if (!is_supported_version(major_version, minor_version)) {
3815 if (name == NULL) {
3816 Exceptions::fthrow(
3817 THREAD_AND_LOCATION,
3818 vmSymbols::java_lang_UnsupportedClassVersionError(),
3819 "Unsupported class file version %u.%u, "
3820 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3821 major_version,
3822 minor_version,
3823 JAVA_MAX_SUPPORTED_VERSION,
3824 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3825 } else {
3826 ResourceMark rm(THREAD);
3827 Exceptions::fthrow(
3828 THREAD_AND_LOCATION,
3829 vmSymbols::java_lang_UnsupportedClassVersionError(),
3830 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3831 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3832 name->as_C_string(),
3833 major_version,
3834 minor_version,
3835 JAVA_MAX_SUPPORTED_VERSION,
3836 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3837 }
3838 return nullHandle;
3839 }
3840
3841 _major_version = major_version;
3842 _minor_version = minor_version;
3843
3844
3845 // Check if verification needs to be relaxed for this class file
3846 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3847 _relax_verify = Verifier::relax_verify_for(class_loader());
3848
3849 // Constant pool
3850 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3851
3852 int cp_size = cp->length();
3853
3854 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3855
3856 // Access flags
3857 AccessFlags access_flags;
3858 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3859
3860 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3861 // Set abstract bit for old class files for backward compatibility
3862 flags |= JVM_ACC_ABSTRACT;
3863 }
3864 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3865 access_flags.set_flags(flags);
3866
3867 // This class and superclass
3868 u2 this_class_index = cfs->get_u2_fast();
3869 check_property(
3870 valid_cp_range(this_class_index, cp_size) &&
3871 cp->tag_at(this_class_index).is_unresolved_klass(),
3872 "Invalid this class index %u in constant pool in class file %s",
3873 this_class_index, CHECK_(nullHandle));
3874
3875 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3876 assert(class_name != NULL, "class_name can't be null");
3877
3878 // It's important to set parsed_name *before* resolving the super class.
3879 // (it's used for cleanup by the caller if parsing fails)
3880 parsed_name = class_name;
3881 // parsed_name is returned and can be used if there's an error, so add to
3882 // its reference count. Caller will decrement the refcount.
3883 parsed_name->increment_refcount();
3884
3885 // Update _class_name which could be null previously to be class_name
3886 _class_name = class_name;
3887
3888 // Don't need to check whether this class name is legal or not.
3889 // It has been checked when constant pool is parsed.
3890 // However, make sure it is not an array type.
3891 if (_need_verify) {
3892 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3893 "Bad class name in class file %s",
3894 CHECK_(nullHandle));
3895 }
3896
3897 Klass* preserve_this_klass; // for storing result across HandleMark
3898
3899 // release all handles when parsing is done
3900 { HandleMark hm(THREAD);
3901
3902 // Checks if name in class file matches requested name
3903 if (name != NULL && class_name != name) {
3904 ResourceMark rm(THREAD);
3905 Exceptions::fthrow(
3906 THREAD_AND_LOCATION,
3907 vmSymbols::java_lang_NoClassDefFoundError(),
3908 "%s (wrong name: %s)",
3909 name->as_C_string(),
3910 class_name->as_C_string()
3911 );
3912 return nullHandle;
3913 }
3914
3915 if (TraceClassLoadingPreorder) {
3916 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3917 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3918 tty->print_cr("]");
3919 }
3920 #if INCLUDE_CDS
3921 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3922 // Only dump the classes that can be stored into CDS archive
3923 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3924 if (name != NULL) {
3925 ResourceMark rm(THREAD);
3926 classlist_file->print_cr("%s", name->as_C_string());
3927 classlist_file->flush();
3928 }
3929 }
3930 }
3931 #endif
3932
3933 u2 super_class_index = cfs->get_u2_fast();
3934 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3935 CHECK_NULL);
3936
3937 // Interfaces
3938 u2 itfs_len = cfs->get_u2_fast();
3939 Array<Klass*>* local_interfaces =
3940 parse_interfaces(itfs_len, protection_domain, _class_name,
3941 &has_default_methods, CHECK_(nullHandle));
3942
3943 u2 java_fields_count = 0;
3944 // Fields (offsets are filled in later)
3945 FieldAllocationCount fac;
3946 Array<u2>* fields = parse_fields(class_name,
3947 access_flags.is_interface(),
3948 &fac, &java_fields_count,
3949 CHECK_(nullHandle));
3950 // Methods
3951 bool has_final_method = false;
3952 AccessFlags promoted_flags;
3953 promoted_flags.set_flags(0);
3954 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3955 &promoted_flags,
3956 &has_final_method,
3957 &declares_default_methods,
3958 CHECK_(nullHandle));
3959 if (declares_default_methods) {
3960 has_default_methods = true;
3961 }
3962
3963 // Additional attributes
3964 ClassAnnotationCollector parsed_annotations;
3965 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3966
3967 // Finalize the Annotations metadata object,
3968 // now that all annotation arrays have been created.
3969 create_combined_annotations(CHECK_(nullHandle));
3970
3971 // Make sure this is the end of class file stream
3972 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3973
3974 // We check super class after class file is parsed and format is checked
3975 if (super_class_index > 0 && super_klass.is_null()) {
3976 Symbol* sk = cp->klass_name_at(super_class_index);
3977 if (access_flags.is_interface()) {
3978 // Before attempting to resolve the superclass, check for class format
3979 // errors not checked yet.
3980 guarantee_property(sk == vmSymbols::java_lang_Object(),
3981 "Interfaces must have java.lang.Object as superclass in class file %s",
3982 CHECK_(nullHandle));
3983 }
3984 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3985 class_loader,
3986 protection_domain,
3987 true,
3988 CHECK_(nullHandle));
3989
3990 KlassHandle kh (THREAD, k);
3991 super_klass = instanceKlassHandle(THREAD, kh());
3992 }
3993 if (super_klass.not_null()) {
3994
3995 if (super_klass->has_default_methods()) {
3996 has_default_methods = true;
3997 }
3998
3999 if (super_klass->is_interface()) {
4000 ResourceMark rm(THREAD);
4001 Exceptions::fthrow(
4002 THREAD_AND_LOCATION,
4003 vmSymbols::java_lang_IncompatibleClassChangeError(),
4004 "class %s has interface %s as super class",
4005 class_name->as_klass_external_name(),
4006 super_klass->external_name()
4007 );
4008 return nullHandle;
4009 }
4010 // Make sure super class is not final
4011 if (super_klass->is_final()) {
4012 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4013 }
4014 }
4015
4016 // save super klass for error handling.
4017 _super_klass = super_klass;
4018
4019 // Compute the transitive list of all unique interfaces implemented by this class
4020 _transitive_interfaces =
4021 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4022
4023 // sort methods
4024 intArray* method_ordering = sort_methods(methods);
4025
4026 // promote flags from parse_methods() to the klass' flags
4027 access_flags.add_promoted_flags(promoted_flags.as_int());
4028
4029 // Size of Java vtable (in words)
4030 int vtable_size = 0;
4031 int itable_size = 0;
4032 int num_miranda_methods = 0;
4033
4034 GrowableArray<Method*> all_mirandas(20);
4035
4036 klassVtable::compute_vtable_size_and_num_mirandas(
4037 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4038 access_flags, class_loader, class_name, local_interfaces,
4039 CHECK_(nullHandle));
4040
4041 // Size of Java itable (in words)
4042 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4043
4044 FieldLayoutInfo info;
4045 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4046
4047 int total_oop_map_size2 =
4048 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4049
4050 // Compute reference type
4051 ReferenceType rt;
4052 if (super_klass() == NULL) {
4053 rt = REF_NONE;
4054 } else {
4055 rt = super_klass->reference_type();
4056 }
4057
4058 // We can now create the basic Klass* for this klass
4059 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4060 vtable_size,
4061 itable_size,
4062 info.static_field_size,
4063 total_oop_map_size2,
4064 rt,
4065 access_flags,
4066 name,
4067 super_klass(),
4068 !host_klass.is_null(),
4069 CHECK_(nullHandle));
4070 instanceKlassHandle this_klass (THREAD, _klass);
4071
4072 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4073 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4074 "sanity");
4075
4076 // Fill in information already parsed
4077 this_klass->set_should_verify_class(verify);
4078 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4079 this_klass->set_layout_helper(lh);
4080 assert(this_klass->oop_is_instance(), "layout is correct");
4081 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4082 // Not yet: supers are done below to support the new subtype-checking fields
4083 //this_klass->set_super(super_klass());
4084 this_klass->set_class_loader_data(loader_data);
4085 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4086 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4087 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4088
4089 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4090
4091 if (has_final_method) {
4092 this_klass->set_has_final_method();
4093 }
4094 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4095 // The InstanceKlass::_methods_jmethod_ids cache
4096 // is managed on the assumption that the initial cache
4097 // size is equal to the number of methods in the class. If
4098 // that changes, then InstanceKlass::idnum_can_increment()
4099 // has to be changed accordingly.
4100 this_klass->set_initial_method_idnum(methods->length());
4101 this_klass->set_name(cp->klass_name_at(this_class_index));
4102 if (is_anonymous()) // I am well known to myself
4103 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4104
4105 this_klass->set_minor_version(minor_version);
4106 this_klass->set_major_version(major_version);
4107 this_klass->set_has_default_methods(has_default_methods);
4108 this_klass->set_declares_default_methods(declares_default_methods);
4109
4110 if (!host_klass.is_null()) {
4111 assert (this_klass->is_anonymous(), "should be the same");
4112 this_klass->set_host_klass(host_klass());
4113 }
4114
4115 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4116 // (We used to do this lazily, but now we query it in Rewriter,
4117 // which is eagerly done for every method, so we might as well do it now,
4118 // when everything is fresh in memory.)
4119 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4120 for (int j = 0; j < methods->length(); j++) {
4121 methods->at(j)->init_intrinsic_id();
4122 }
4123 }
4124
4125 if (cached_class_file != NULL) {
4126 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4127 this_klass->set_cached_class_file(cached_class_file);
4128 }
4129
4130 // Fill in field values obtained by parse_classfile_attributes
4131 if (parsed_annotations.has_any_annotations())
4132 parsed_annotations.apply_to(this_klass);
4133 apply_parsed_class_attributes(this_klass);
4134
4135 // Miranda methods
4136 if ((num_miranda_methods > 0) ||
4137 // if this class introduced new miranda methods or
4138 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4139 // super class exists and this class inherited miranda methods
4140 ) {
4141 this_klass->set_has_miranda_methods(); // then set a flag
4142 }
4143
4144 // Fill in information needed to compute superclasses.
4145 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4146
4147 // Initialize itable offset tables
4148 klassItable::setup_itable_offset_table(this_klass);
4149
4150 // Compute transitive closure of interfaces this class implements
4151 // Do final class setup
4152 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4153
4154 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4155 set_precomputed_flags(this_klass);
4156
4157 // reinitialize modifiers, using the InnerClasses attribute
4158 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4159 this_klass->set_modifier_flags(computed_modifiers);
4160
4161 // check if this class can access its super class
4162 check_super_class_access(this_klass, CHECK_(nullHandle));
4163
4164 // check if this class can access its superinterfaces
4165 check_super_interface_access(this_klass, CHECK_(nullHandle));
4166
4167 // check if this class overrides any final method
4168 check_final_method_override(this_klass, CHECK_(nullHandle));
4169
4170 // check that if this class is an interface then it doesn't have static methods
4171 if (this_klass->is_interface()) {
4172 /* An interface in a JAVA 8 classfile can be static */
4173 if (_major_version < JAVA_8_VERSION) {
4174 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4175 }
4176 }
4177
4178 // Allocate mirror and initialize static fields
4179 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4180 CHECK_(nullHandle));
4181
4182 // Generate any default methods - default methods are interface methods
4183 // that have a default implementation. This is new with Lambda project.
4184 if (has_default_methods ) {
4185 DefaultMethods::generate_default_methods(
4186 this_klass(), &all_mirandas, CHECK_(nullHandle));
4187 }
4188
4189 // Update the loader_data graph.
4190 record_defined_class_dependencies(this_klass, CHECK_NULL);
4191
4192 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4193 false /* not shared class */);
4194
4195 if (TraceClassLoading) {
4196 ResourceMark rm;
4197 // print in a single call to reduce interleaving of output
4198 if (cfs->source() != NULL) {
4199 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4200 cfs->source());
4201 } else if (class_loader.is_null()) {
4202 Klass* caller =
4203 THREAD->is_Java_thread()
4204 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4205 : NULL;
4206 // caller can be NULL, for example, during a JVMTI VM_Init hook
4207 if (caller != NULL) {
4208 tty->print("[Loaded %s by instance of %s]\n",
4209 this_klass->external_name(),
4210 InstanceKlass::cast(caller)->external_name());
4211 } else {
4212 tty->print("[Loaded %s]\n", this_klass->external_name());
4213 }
4214 } else {
4215 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4216 InstanceKlass::cast(class_loader->klass())->external_name());
4217 }
4218 }
4219
4220 if (TraceClassResolution) {
4221 ResourceMark rm;
4222 // print out the superclass.
4223 const char * from = this_klass()->external_name();
4224 if (this_klass->java_super() != NULL) {
4225 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4226 }
4227 // print out each of the interface classes referred to by this class.
4228 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4229 if (local_interfaces != NULL) {
4230 int length = local_interfaces->length();
4231 for (int i = 0; i < length; i++) {
4232 Klass* k = local_interfaces->at(i);
4233 InstanceKlass* to_class = InstanceKlass::cast(k);
4234 const char * to = to_class->external_name();
4235 tty->print("RESOLVE %s %s (interface)\n", from, to);
4236 }
4237 }
4238 }
4239
4240 // preserve result across HandleMark
4241 preserve_this_klass = this_klass();
4242 }
4243
4244 // Create new handle outside HandleMark (might be needed for
4245 // Extended Class Redefinition)
4246 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4247 debug_only(this_klass->verify();)
4248
4249 // Clear class if no error has occurred so destructor doesn't deallocate it
4250 _klass = NULL;
4251 return this_klass;
4252 }
4253
4254 // Destructor to clean up if there's an error
4255 ClassFileParser::~ClassFileParser() {
4256 MetadataFactory::free_metadata(_loader_data, _cp);
4257 MetadataFactory::free_array<u2>(_loader_data, _fields);
4258
4259 // Free methods
4260 InstanceKlass::deallocate_methods(_loader_data, _methods);
4261
4262 // beware of the Universe::empty_blah_array!!
4263 if (_inner_classes != Universe::the_empty_short_array()) {
4264 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4265 }
4266
4267 // Free interfaces
4268 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4269 _local_interfaces, _transitive_interfaces);
4270
4271 if (_combined_annotations != NULL) {
4272 // After all annotations arrays have been created, they are installed into the
4273 // Annotations object that will be assigned to the InstanceKlass being created.
4274
4275 // Deallocate the Annotations object and the installed annotations arrays.
4276 _combined_annotations->deallocate_contents(_loader_data);
4277
4278 // If the _combined_annotations pointer is non-NULL,
4279 // then the other annotations fields should have been cleared.
4280 assert(_annotations == NULL, "Should have been cleared");
4281 assert(_type_annotations == NULL, "Should have been cleared");
4282 assert(_fields_annotations == NULL, "Should have been cleared");
4283 assert(_fields_type_annotations == NULL, "Should have been cleared");
4284 } else {
4285 // If the annotations arrays were not installed into the Annotations object,
4286 // then they have to be deallocated explicitly.
4287 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4288 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4289 Annotations::free_contents(_loader_data, _fields_annotations);
4290 Annotations::free_contents(_loader_data, _fields_type_annotations);
4291 }
4292
4293 clear_class_metadata();
4294
4295 // deallocate the klass if already created. Don't directly deallocate, but add
4296 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4297 // at a safepoint.
4298 if (_klass != NULL) {
4299 _loader_data->add_to_deallocate_list(_klass);
4300 }
4301 _klass = NULL;
4302 }
4303
4304 void ClassFileParser::print_field_layout(Symbol* name,
4305 Array<u2>* fields,
4306 constantPoolHandle cp,
4307 int instance_size,
4308 int instance_fields_start,
4309 int instance_fields_end,
4310 int static_fields_end) {
4311 tty->print("%s: field layout\n", name->as_klass_external_name());
4312 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4313 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4314 if (!fs.access_flags().is_static()) {
4315 tty->print(" @%3d \"%s\" %s\n",
4316 fs.offset(),
4317 fs.name()->as_klass_external_name(),
4318 fs.signature()->as_klass_external_name());
4319 }
4320 }
4321 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4322 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4323 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4324 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4325 if (fs.access_flags().is_static()) {
4326 tty->print(" @%3d \"%s\" %s\n",
4327 fs.offset(),
4328 fs.name()->as_klass_external_name(),
4329 fs.signature()->as_klass_external_name());
4330 }
4331 }
4332 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4333 tty->print("\n");
4334 }
4335
4336 unsigned int
4337 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4338 unsigned int nonstatic_oop_map_count,
4339 int first_nonstatic_oop_offset) {
4340 unsigned int map_count =
4341 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4342 if (nonstatic_oop_map_count > 0) {
4343 // We have oops to add to map
4344 if (map_count == 0) {
4345 map_count = nonstatic_oop_map_count;
4346 } else {
4347 // Check whether we should add a new map block or whether the last one can
4348 // be extended
4349 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4350 OopMapBlock* const last_map = first_map + map_count - 1;
4351
4352 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4353 if (next_offset == first_nonstatic_oop_offset) {
4354 // There is no gap bettwen superklass's last oop field and first
4355 // local oop field, merge maps.
4356 nonstatic_oop_map_count -= 1;
4357 } else {
4358 // Superklass didn't end with a oop field, add extra maps
4359 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4360 }
4361 map_count += nonstatic_oop_map_count;
4362 }
4363 }
4364 return map_count;
4365 }
4366
4367
4368 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4369 unsigned int nonstatic_oop_map_count,
4370 int* nonstatic_oop_offsets,
4371 unsigned int* nonstatic_oop_counts) {
4372 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4373 const InstanceKlass* const super = k->superklass();
4374 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4375 if (super_count > 0) {
4376 // Copy maps from superklass
4377 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4378 for (unsigned int i = 0; i < super_count; ++i) {
4379 *this_oop_map++ = *super_oop_map++;
4380 }
4381 }
4382
4383 if (nonstatic_oop_map_count > 0) {
4384 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4385 // The counts differ because there is no gap between superklass's last oop
4386 // field and the first local oop field. Extend the last oop map copied
4387 // from the superklass instead of creating new one.
4388 nonstatic_oop_map_count--;
4389 nonstatic_oop_offsets++;
4390 this_oop_map--;
4391 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4392 this_oop_map++;
4393 }
4394
4395 // Add new map blocks, fill them
4396 while (nonstatic_oop_map_count-- > 0) {
4397 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4398 this_oop_map->set_count(*nonstatic_oop_counts++);
4399 this_oop_map++;
4400 }
4401 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4402 this_oop_map, "sanity");
4403 }
4404 }
4405
4406
4407 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4408 Klass* super = k->super();
4409
4410 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4411 // in which case we don't have to register objects as finalizable
4412 if (!_has_empty_finalizer) {
4413 if (_has_finalizer ||
4414 (super != NULL && super->has_finalizer())) {
4415 k->set_has_finalizer();
4416 }
4417 }
4418
4419 #ifdef ASSERT
4420 bool f = false;
4421 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4422 vmSymbols::void_method_signature());
4423 if (m != NULL && !m->is_empty_method()) {
4424 f = true;
4425 }
4426
4427 // Spec doesn't prevent agent from redefinition of empty finalizer.
4428 // Despite the fact that it's generally bad idea and redefined finalizer
4429 // will not work as expected we shouldn't abort vm in this case
4430 if (!k->has_redefined_this_or_super()) {
4431 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4432 }
4433 #endif
4434
4435 // Check if this klass supports the java.lang.Cloneable interface
4436 if (SystemDictionary::Cloneable_klass_loaded()) {
4437 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4438 k->set_is_cloneable();
4439 }
4440 }
4441
4442 // Check if this klass has a vanilla default constructor
4443 if (super == NULL) {
4444 // java.lang.Object has empty default constructor
4445 k->set_has_vanilla_constructor();
4446 } else {
4447 if (super->has_vanilla_constructor() &&
4448 _has_vanilla_constructor) {
4449 k->set_has_vanilla_constructor();
4450 }
4451 #ifdef ASSERT
4452 bool v = false;
4453 if (super->has_vanilla_constructor()) {
4454 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4455 ), vmSymbols::void_method_signature());
4456 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4457 v = true;
4458 }
4459 }
4460 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4461 #endif
4462 }
4463
4464 // If it cannot be fast-path allocated, set a bit in the layout helper.
4465 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4466 assert(k->size_helper() > 0, "layout_helper is initialized");
4467 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4468 || k->is_abstract() || k->is_interface()
4469 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4470 || k->size_helper() >= FastAllocateSizeLimit) {
4471 // Forbid fast-path allocation.
4472 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4473 k->set_layout_helper(lh);
4474 }
4475 }
4476
4477 // Attach super classes and interface classes to class loader data
4478 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4479 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4480 if (defining_loader_data->is_the_null_class_loader_data()) {
4481 // Dependencies to null class loader data are implicit.
4482 return;
4483 } else {
4484 // add super class dependency
4485 Klass* super = defined_klass->super();
4486 if (super != NULL) {
4487 defining_loader_data->record_dependency(super, CHECK);
4488 }
4489
4490 // add super interface dependencies
4491 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4492 if (local_interfaces != NULL) {
4493 int length = local_interfaces->length();
4494 for (int i = 0; i < length; i++) {
4495 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4496 }
4497 }
4498 }
4499 }
4500
4501 // utility methods for appending an array with check for duplicates
4502
4503 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4504 // iterate over new interfaces
4505 for (int i = 0; i < ifs->length(); i++) {
4506 Klass* e = ifs->at(i);
4507 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4508 // add new interface
4509 result->append_if_missing(e);
4510 }
4511 }
4512
4513 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4514 instanceKlassHandle super,
4515 Array<Klass*>* local_ifs, TRAPS) {
4516 // Compute maximum size for transitive interfaces
4517 int max_transitive_size = 0;
4518 int super_size = 0;
4519 // Add superclass transitive interfaces size
4520 if (super.not_null()) {
4521 super_size = super->transitive_interfaces()->length();
4522 max_transitive_size += super_size;
4523 }
4524 // Add local interfaces' super interfaces
4525 int local_size = local_ifs->length();
4526 for (int i = 0; i < local_size; i++) {
4527 Klass* l = local_ifs->at(i);
4528 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4529 }
4530 // Finally add local interfaces
4531 max_transitive_size += local_size;
4532 // Construct array
4533 if (max_transitive_size == 0) {
4534 // no interfaces, use canonicalized array
4535 return Universe::the_empty_klass_array();
4536 } else if (max_transitive_size == super_size) {
4537 // no new local interfaces added, share superklass' transitive interface array
4538 return super->transitive_interfaces();
4539 } else if (max_transitive_size == local_size) {
4540 // only local interfaces added, share local interface array
4541 return local_ifs;
4542 } else {
4543 ResourceMark rm;
4544 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4545
4546 // Copy down from superclass
4547 if (super.not_null()) {
4548 append_interfaces(result, super->transitive_interfaces());
4549 }
4550
4551 // Copy down from local interfaces' superinterfaces
4552 for (int i = 0; i < local_ifs->length(); i++) {
4553 Klass* l = local_ifs->at(i);
4554 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4555 }
4556 // Finally add local interfaces
4557 append_interfaces(result, local_ifs);
4558
4559 // length will be less than the max_transitive_size if duplicates were removed
4560 int length = result->length();
4561 assert(length <= max_transitive_size, "just checking");
4562 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4563 for (int i = 0; i < length; i++) {
4564 Klass* e = result->at(i);
4565 assert(e != NULL, "just checking");
4566 new_result->at_put(i, e);
4567 }
4568 return new_result;
4569 }
4570 }
4571
4572 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4573 Klass* super = this_klass->super();
4574 if ((super != NULL) &&
4575 (!Reflection::verify_class_access(this_klass(), super, false))) {
4576 ResourceMark rm(THREAD);
4577 Exceptions::fthrow(
4578 THREAD_AND_LOCATION,
4579 vmSymbols::java_lang_IllegalAccessError(),
4580 "class %s cannot access its superclass %s",
4581 this_klass->external_name(),
4582 InstanceKlass::cast(super)->external_name()
4583 );
4584 return;
4585 }
4586 }
4587
4588
4589 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4590 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4591 int lng = local_interfaces->length();
4592 for (int i = lng - 1; i >= 0; i--) {
4593 Klass* k = local_interfaces->at(i);
4594 assert (k != NULL && k->is_interface(), "invalid interface");
4595 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4596 ResourceMark rm(THREAD);
4597 Exceptions::fthrow(
4598 THREAD_AND_LOCATION,
4599 vmSymbols::java_lang_IllegalAccessError(),
4600 "class %s cannot access its superinterface %s",
4601 this_klass->external_name(),
4602 InstanceKlass::cast(k)->external_name()
4603 );
4604 return;
4605 }
4606 }
4607 }
4608
4609
4610 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4611 Array<Method*>* methods = this_klass->methods();
4612 int num_methods = methods->length();
4613
4614 // go thru each method and check if it overrides a final method
4615 for (int index = 0; index < num_methods; index++) {
4616 Method* m = methods->at(index);
4617
4618 // skip private, static, and <init> methods
4619 if ((!m->is_private() && !m->is_static()) &&
4620 (m->name() != vmSymbols::object_initializer_name())) {
4621
4622 Symbol* name = m->name();
4623 Symbol* signature = m->signature();
4624 Klass* k = this_klass->super();
4625 Method* super_m = NULL;
4626 while (k != NULL) {
4627 // skip supers that don't have final methods.
4628 if (k->has_final_method()) {
4629 // lookup a matching method in the super class hierarchy
4630 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4631 if (super_m == NULL) {
4632 break; // didn't find any match; get out
4633 }
4634
4635 if (super_m->is_final() && !super_m->is_static() &&
4636 // matching method in super is final, and not static
4637 (Reflection::verify_field_access(this_klass(),
4638 super_m->method_holder(),
4639 super_m->method_holder(),
4640 super_m->access_flags(), false))
4641 // this class can access super final method and therefore override
4642 ) {
4643 ResourceMark rm(THREAD);
4644 Exceptions::fthrow(
4645 THREAD_AND_LOCATION,
4646 vmSymbols::java_lang_VerifyError(),
4647 "class %s overrides final method %s.%s",
4648 this_klass->external_name(),
4649 name->as_C_string(),
4650 signature->as_C_string()
4651 );
4652 return;
4653 }
4654
4655 // continue to look from super_m's holder's super.
4656 k = super_m->method_holder()->super();
4657 continue;
4658 }
4659
4660 k = k->super();
4661 }
4662 }
4663 }
4664 }
4665
4666
4667 // assumes that this_klass is an interface
4668 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4669 assert(this_klass->is_interface(), "not an interface");
4670 Array<Method*>* methods = this_klass->methods();
4671 int num_methods = methods->length();
4672
4673 for (int index = 0; index < num_methods; index++) {
4674 Method* m = methods->at(index);
4675 // if m is static and not the init method, throw a verify error
4676 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4677 ResourceMark rm(THREAD);
4678 Exceptions::fthrow(
4679 THREAD_AND_LOCATION,
4680 vmSymbols::java_lang_VerifyError(),
4681 "Illegal static method %s in interface %s",
4682 m->name()->as_C_string(),
4683 this_klass->external_name()
4684 );
4685 return;
4686 }
4687 }
4688 }
4689
4690 // utility methods for format checking
4691
4692 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4693 if (!_need_verify) { return; }
4694
4695 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4696 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4697 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4698 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4699 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4700 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4701 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4702
4703 if ((is_abstract && is_final) ||
4704 (is_interface && !is_abstract) ||
4705 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4706 (!is_interface && major_gte_15 && is_annotation)) {
4707 ResourceMark rm(THREAD);
4708 Exceptions::fthrow(
4709 THREAD_AND_LOCATION,
4710 vmSymbols::java_lang_ClassFormatError(),
4711 "Illegal class modifiers in class %s: 0x%X",
4712 _class_name->as_C_string(), flags
4713 );
4714 return;
4715 }
4716 }
4717
4718 bool ClassFileParser::has_illegal_visibility(jint flags) {
4719 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4720 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4721 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4722
4723 return ((is_public && is_protected) ||
4724 (is_public && is_private) ||
4725 (is_protected && is_private));
4726 }
4727
4728 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4729 u2 max_version =
4730 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4731 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4732 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4733 (major <= max_version) &&
4734 ((major != max_version) ||
4735 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4736 }
4737
4738 void ClassFileParser::verify_legal_field_modifiers(
4739 jint flags, bool is_interface, TRAPS) {
4740 if (!_need_verify) { return; }
4741
4742 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4743 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4744 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4745 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4746 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4747 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4748 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4749 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4750 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4751
4752 bool is_illegal = false;
4753
4754 if (is_interface) {
4755 if (!is_public || !is_static || !is_final || is_private ||
4756 is_protected || is_volatile || is_transient ||
4757 (major_gte_15 && is_enum)) {
4758 is_illegal = true;
4759 }
4760 } else { // not interface
4761 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4762 is_illegal = true;
4763 }
4764 }
4765
4766 if (is_illegal) {
4767 ResourceMark rm(THREAD);
4768 Exceptions::fthrow(
4769 THREAD_AND_LOCATION,
4770 vmSymbols::java_lang_ClassFormatError(),
4771 "Illegal field modifiers in class %s: 0x%X",
4772 _class_name->as_C_string(), flags);
4773 return;
4774 }
4775 }
4776
4777 void ClassFileParser::verify_legal_method_modifiers(
4778 jint flags, bool is_interface, Symbol* name, TRAPS) {
4779 if (!_need_verify) { return; }
4780
4781 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4782 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4783 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4784 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4785 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4786 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4787 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4788 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4789 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4790 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4791 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4792 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4793 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4794
4795 bool is_illegal = false;
4796
4797 if (is_interface) {
4798 if (major_gte_8) {
4799 // Class file version is JAVA_8_VERSION or later Methods of
4800 // interfaces may set any of the flags except ACC_PROTECTED,
4801 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4802 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4803 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4804 (is_native || is_protected || is_final || is_synchronized) ||
4805 // If a specific method of a class or interface has its
4806 // ACC_ABSTRACT flag set, it must not have any of its
4807 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4808 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4809 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4810 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4811 (is_abstract && (is_private || is_static || is_strict))) {
4812 is_illegal = true;
4813 }
4814 } else if (major_gte_15) {
4815 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4816 if (!is_public || is_static || is_final || is_synchronized ||
4817 is_native || !is_abstract || is_strict) {
4818 is_illegal = true;
4819 }
4820 } else {
4821 // Class file version is pre-JAVA_1_5_VERSION
4822 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4823 is_illegal = true;
4824 }
4825 }
4826 } else { // not interface
4827 if (is_initializer) {
4828 if (is_static || is_final || is_synchronized || is_native ||
4829 is_abstract || (major_gte_15 && is_bridge)) {
4830 is_illegal = true;
4831 }
4832 } else { // not initializer
4833 if (is_abstract) {
4834 if ((is_final || is_native || is_private || is_static ||
4835 (major_gte_15 && (is_synchronized || is_strict)))) {
4836 is_illegal = true;
4837 }
4838 }
4839 if (has_illegal_visibility(flags)) {
4840 is_illegal = true;
4841 }
4842 }
4843 }
4844
4845 if (is_illegal) {
4846 ResourceMark rm(THREAD);
4847 Exceptions::fthrow(
4848 THREAD_AND_LOCATION,
4849 vmSymbols::java_lang_ClassFormatError(),
4850 "Method %s in class %s has illegal modifiers: 0x%X",
4851 name->as_C_string(), _class_name->as_C_string(), flags);
4852 return;
4853 }
4854 }
4855
4856 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4857 assert(_need_verify, "only called when _need_verify is true");
4858 int i = 0;
4859 int count = length >> 2;
4860 for (int k=0; k<count; k++) {
4861 unsigned char b0 = buffer[i];
4862 unsigned char b1 = buffer[i+1];
4863 unsigned char b2 = buffer[i+2];
4864 unsigned char b3 = buffer[i+3];
4865 // For an unsigned char v,
4866 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4867 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4868 unsigned char res = b0 | b0 - 1 |
4869 b1 | b1 - 1 |
4870 b2 | b2 - 1 |
4871 b3 | b3 - 1;
4872 if (res >= 128) break;
4873 i += 4;
4874 }
4875 for(; i < length; i++) {
4876 unsigned short c;
4877 // no embedded zeros
4878 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4879 if(buffer[i] < 128) {
4880 continue;
4881 }
4882 if ((i + 5) < length) { // see if it's legal supplementary character
4883 if (UTF8::is_supplementary_character(&buffer[i])) {
4884 c = UTF8::get_supplementary_character(&buffer[i]);
4885 i += 5;
4886 continue;
4887 }
4888 }
4889 switch (buffer[i] >> 4) {
4890 default: break;
4891 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4892 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4893 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4894 c = (buffer[i] & 0x1F) << 6;
4895 i++;
4896 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4897 c += buffer[i] & 0x3F;
4898 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4899 // for classes with major > 47, c must a null or a character in its shortest form
4900 break;
4901 }
4902 }
4903 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4904 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4905 c = (buffer[i] & 0xF) << 12;
4906 i += 2;
4907 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4908 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4909 if (_major_version <= 47 || c >= 0x800) {
4910 // for classes with major > 47, c must be in its shortest form
4911 break;
4912 }
4913 }
4914 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4915 } // end of switch
4916 } // end of for
4917 }
4918
4919 // Checks if name is a legal class name.
4920 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4921 if (!_need_verify || _relax_verify) { return; }
4922
4923 char buf[fixed_buffer_size];
4924 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4925 unsigned int length = name->utf8_length();
4926 bool legal = false;
4927
4928 if (length > 0) {
4929 char* p;
4930 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4931 p = skip_over_field_signature(bytes, false, length, CHECK);
4932 legal = (p != NULL) && ((p - bytes) == (int)length);
4933 } else if (_major_version < JAVA_1_5_VERSION) {
4934 if (bytes[0] != '<') {
4935 p = skip_over_field_name(bytes, true, length);
4936 legal = (p != NULL) && ((p - bytes) == (int)length);
4937 }
4938 } else {
4939 // 4900761: relax the constraints based on JSR202 spec
4940 // Class names may be drawn from the entire Unicode character set.
4941 // Identifiers between '/' must be unqualified names.
4942 // The utf8 string has been verified when parsing cpool entries.
4943 legal = verify_unqualified_name(bytes, length, LegalClass);
4944 }
4945 }
4946 if (!legal) {
4947 ResourceMark rm(THREAD);
4948 Exceptions::fthrow(
4949 THREAD_AND_LOCATION,
4950 vmSymbols::java_lang_ClassFormatError(),
4951 "Illegal class name \"%s\" in class file %s", bytes,
4952 _class_name->as_C_string()
4953 );
4954 return;
4955 }
4956 }
4957
4958 // Checks if name is a legal field name.
4959 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4960 if (!_need_verify || _relax_verify) { return; }
4961
4962 char buf[fixed_buffer_size];
4963 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4964 unsigned int length = name->utf8_length();
4965 bool legal = false;
4966
4967 if (length > 0) {
4968 if (_major_version < JAVA_1_5_VERSION) {
4969 if (bytes[0] != '<') {
4970 char* p = skip_over_field_name(bytes, false, length);
4971 legal = (p != NULL) && ((p - bytes) == (int)length);
4972 }
4973 } else {
4974 // 4881221: relax the constraints based on JSR202 spec
4975 legal = verify_unqualified_name(bytes, length, LegalField);
4976 }
4977 }
4978
4979 if (!legal) {
4980 ResourceMark rm(THREAD);
4981 Exceptions::fthrow(
4982 THREAD_AND_LOCATION,
4983 vmSymbols::java_lang_ClassFormatError(),
4984 "Illegal field name \"%s\" in class %s", bytes,
4985 _class_name->as_C_string()
4986 );
4987 return;
4988 }
4989 }
4990
4991 // Checks if name is a legal method name.
4992 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4993 if (!_need_verify || _relax_verify) { return; }
4994
4995 assert(name != NULL, "method name is null");
4996 char buf[fixed_buffer_size];
4997 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4998 unsigned int length = name->utf8_length();
4999 bool legal = false;
5000
5001 if (length > 0) {
5002 if (bytes[0] == '<') {
5003 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5004 legal = true;
5005 }
5006 } else if (_major_version < JAVA_1_5_VERSION) {
5007 char* p;
5008 p = skip_over_field_name(bytes, false, length);
5009 legal = (p != NULL) && ((p - bytes) == (int)length);
5010 } else {
5011 // 4881221: relax the constraints based on JSR202 spec
5012 legal = verify_unqualified_name(bytes, length, LegalMethod);
5013 }
5014 }
5015
5016 if (!legal) {
5017 ResourceMark rm(THREAD);
5018 Exceptions::fthrow(
5019 THREAD_AND_LOCATION,
5020 vmSymbols::java_lang_ClassFormatError(),
5021 "Illegal method name \"%s\" in class %s", bytes,
5022 _class_name->as_C_string()
5023 );
5024 return;
5025 }
5026 }
5027
5028
5029 // Checks if signature is a legal field signature.
5030 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5031 if (!_need_verify) { return; }
5032
5033 char buf[fixed_buffer_size];
5034 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5035 unsigned int length = signature->utf8_length();
5036 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5037
5038 if (p == NULL || (p - bytes) != (int)length) {
5039 throwIllegalSignature("Field", name, signature, CHECK);
5040 }
5041 }
5042
5043 // Checks if signature is a legal method signature.
5044 // Returns number of parameters
5045 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5046 if (!_need_verify) {
5047 // make sure caller's args_size will be less than 0 even for non-static
5048 // method so it will be recomputed in compute_size_of_parameters().
5049 return -2;
5050 }
5051
5052 unsigned int args_size = 0;
5053 char buf[fixed_buffer_size];
5054 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5055 unsigned int length = signature->utf8_length();
5056 char* nextp;
5057
5058 // The first character must be a '('
5059 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5060 length--;
5061 // Skip over legal field signatures
5062 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5063 while ((length > 0) && (nextp != NULL)) {
5064 args_size++;
5065 if (p[0] == 'J' || p[0] == 'D') {
5066 args_size++;
5067 }
5068 length -= nextp - p;
5069 p = nextp;
5070 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5071 }
5072 // The first non-signature thing better be a ')'
5073 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5074 length--;
5075 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5076 // All internal methods must return void
5077 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5078 return args_size;
5079 }
5080 } else {
5081 // Now we better just have a return value
5082 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5083 if (nextp && ((int)length == (nextp - p))) {
5084 return args_size;
5085 }
5086 }
5087 }
5088 }
5089 // Report error
5090 throwIllegalSignature("Method", name, signature, CHECK_0);
5091 return 0;
5092 }
5093
5094
5095 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5096 // Method names also may not contain the characters '<' or '>', unless <init>
5097 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5098 // method. Because these names have been checked as special cases before
5099 // calling this method in verify_legal_method_name.
5100 bool ClassFileParser::verify_unqualified_name(
5101 char* name, unsigned int length, int type) {
5102 jchar ch;
5103
5104 for (char* p = name; p != name + length; ) {
5105 ch = *p;
5106 if (ch < 128) {
5107 p++;
5108 if (ch == '.' || ch == ';' || ch == '[' ) {
5109 return false; // do not permit '.', ';', or '['
5110 }
5111 if (type != LegalClass && ch == '/') {
5112 return false; // do not permit '/' unless it's class name
5113 }
5114 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5115 return false; // do not permit '<' or '>' in method names
5116 }
5117 } else {
5118 char* tmp_p = UTF8::next(p, &ch);
5119 p = tmp_p;
5120 }
5121 }
5122 return true;
5123 }
5124
5125
5126 // Take pointer to a string. Skip over the longest part of the string that could
5127 // be taken as a fieldname. Allow '/' if slash_ok is true.
5128 // Return a pointer to just past the fieldname.
5129 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5130 // being true, we saw consecutive slashes (meaning we were looking for a
5131 // qualified path but found something that was badly-formed).
5132 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5133 char* p;
5134 jchar ch;
5135 jboolean last_is_slash = false;
5136 jboolean not_first_ch = false;
5137
5138 for (p = name; p != name + length; not_first_ch = true) {
5139 char* old_p = p;
5140 ch = *p;
5141 if (ch < 128) {
5142 p++;
5143 // quick check for ascii
5144 if ((ch >= 'a' && ch <= 'z') ||
5145 (ch >= 'A' && ch <= 'Z') ||
5146 (ch == '_' || ch == '$') ||
5147 (not_first_ch && ch >= '0' && ch <= '9')) {
5148 last_is_slash = false;
5149 continue;
5150 }
5151 if (slash_ok && ch == '/') {
5152 if (last_is_slash) {
5153 return NULL; // Don't permit consecutive slashes
5154 }
5155 last_is_slash = true;
5156 continue;
5157 }
5158 } else {
5159 jint unicode_ch;
5160 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5161 p = tmp_p;
5162 last_is_slash = false;
5163 // Check if ch is Java identifier start or is Java identifier part
5164 // 4672820: call java.lang.Character methods directly without generating separate tables.
5165 EXCEPTION_MARK;
5166 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5167
5168 // return value
5169 JavaValue result(T_BOOLEAN);
5170 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5171 JavaCallArguments args;
5172 args.push_int(unicode_ch);
5173
5174 // public static boolean isJavaIdentifierStart(char ch);
5175 JavaCalls::call_static(&result,
5176 klass,
5177 vmSymbols::isJavaIdentifierStart_name(),
5178 vmSymbols::int_bool_signature(),
5179 &args,
5180 THREAD);
5181
5182 if (HAS_PENDING_EXCEPTION) {
5183 CLEAR_PENDING_EXCEPTION;
5184 return 0;
5185 }
5186 if (result.get_jboolean()) {
5187 continue;
5188 }
5189
5190 if (not_first_ch) {
5191 // public static boolean isJavaIdentifierPart(char ch);
5192 JavaCalls::call_static(&result,
5193 klass,
5194 vmSymbols::isJavaIdentifierPart_name(),
5195 vmSymbols::int_bool_signature(),
5196 &args,
5197 THREAD);
5198
5199 if (HAS_PENDING_EXCEPTION) {
5200 CLEAR_PENDING_EXCEPTION;
5201 return 0;
5202 }
5203
5204 if (result.get_jboolean()) {
5205 continue;
5206 }
5207 }
5208 }
5209 return (not_first_ch) ? old_p : NULL;
5210 }
5211 return (not_first_ch) ? p : NULL;
5212 }
5213
5214
5215 // Take pointer to a string. Skip over the longest part of the string that could
5216 // be taken as a field signature. Allow "void" if void_ok.
5217 // Return a pointer to just past the signature.
5218 // Return NULL if no legal signature is found.
5219 char* ClassFileParser::skip_over_field_signature(char* signature,
5220 bool void_ok,
5221 unsigned int length,
5222 TRAPS) {
5223 unsigned int array_dim = 0;
5224 while (length > 0) {
5225 switch (signature[0]) {
5226 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5227 case JVM_SIGNATURE_BOOLEAN:
5228 case JVM_SIGNATURE_BYTE:
5229 case JVM_SIGNATURE_CHAR:
5230 case JVM_SIGNATURE_SHORT:
5231 case JVM_SIGNATURE_INT:
5232 case JVM_SIGNATURE_FLOAT:
5233 case JVM_SIGNATURE_LONG:
5234 case JVM_SIGNATURE_DOUBLE:
5235 return signature + 1;
5236 case JVM_SIGNATURE_CLASS: {
5237 if (_major_version < JAVA_1_5_VERSION) {
5238 // Skip over the class name if one is there
5239 char* p = skip_over_field_name(signature + 1, true, --length);
5240
5241 // The next character better be a semicolon
5242 if (p && (p - signature) > 1 && p[0] == ';') {
5243 return p + 1;
5244 }
5245 } else {
5246 // 4900761: For class version > 48, any unicode is allowed in class name.
5247 length--;
5248 signature++;
5249 while (length > 0 && signature[0] != ';') {
5250 if (signature[0] == '.') {
5251 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5252 }
5253 length--;
5254 signature++;
5255 }
5256 if (signature[0] == ';') { return signature + 1; }
5257 }
5258
5259 return NULL;
5260 }
5261 case JVM_SIGNATURE_ARRAY:
5262 array_dim++;
5263 if (array_dim > 255) {
5264 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5265 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5266 }
5267 // The rest of what's there better be a legal signature
5268 signature++;
5269 length--;
5270 void_ok = false;
5271 break;
5272
5273 default:
5274 return NULL;
5275 }
5276 }
5277 return NULL;
5278 }