1 /*
2 * Copyright (c) 1997, 2018, 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 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "gc/shared/gcLocker.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/perfData.hpp"
64 #include "runtime/reflection.hpp"
65 #include "runtime/signature.hpp"
66 #include "runtime/timer.hpp"
67 #include "services/classLoadingService.hpp"
68 #include "services/threadService.hpp"
69 #include "trace/traceMacros.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/bitMap.inline.hpp"
72 #include "utilities/exceptions.hpp"
73 #include "utilities/globalDefinitions.hpp"
74 #include "utilities/growableArray.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/ostream.hpp"
77 #include "utilities/resourceHash.hpp"
78 #if INCLUDE_CDS
79 #include "classfile/systemDictionaryShared.hpp"
80 #endif
81
82 // We generally try to create the oops directly when parsing, rather than
83 // allocating temporary data structures and copying the bytes twice. A
84 // temporary area is only needed when parsing utf8 entries in the constant
85 // pool and when parsing line number tables.
86
87 // We add assert in debug mode when class format is not checked.
88
89 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
90 #define JAVA_MIN_SUPPORTED_VERSION 45
91
92 // Used for two backward compatibility reasons:
93 // - to check for new additions to the class file format in JDK1.5
94 // - to check for bug fixes in the format checker in JDK1.5
95 #define JAVA_1_5_VERSION 49
96
97 // Used for backward compatibility reasons:
98 // - to check for javac bug fixes that happened after 1.5
99 // - also used as the max version when running in jdk6
100 #define JAVA_6_VERSION 50
101
102 // Used for backward compatibility reasons:
103 // - to disallow argument and require ACC_STATIC for <clinit> methods
104 #define JAVA_7_VERSION 51
105
106 // Extension method support.
107 #define JAVA_8_VERSION 52
108
109 #define JAVA_9_VERSION 53
110
111 #define JAVA_10_VERSION 54
112
113 #define JAVA_11_VERSION 55
114
115 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
116 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
117 "Unexpected bad constant pool entry");
118 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
119 }
120
121 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
122 ConstantPool* cp,
123 const int length,
124 TRAPS) {
125 assert(stream != NULL, "invariant");
126 assert(cp != NULL, "invariant");
127
128 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
129 // this function (_current can be allocated in a register, with scalar
130 // replacement of aggregates). The _current pointer is copied back to
131 // stream() when this function returns. DON'T call another method within
132 // this method that uses stream().
133 const ClassFileStream cfs1 = *stream;
134 const ClassFileStream* const cfs = &cfs1;
135
136 assert(cfs->allocated_on_stack(), "should be local");
137 debug_only(const u1* const old_current = stream->current();)
138
139 // Used for batching symbol allocations.
140 const char* names[SymbolTable::symbol_alloc_batch_size];
141 int lengths[SymbolTable::symbol_alloc_batch_size];
142 int indices[SymbolTable::symbol_alloc_batch_size];
143 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
144 int names_count = 0;
145
146 // parsing Index 0 is unused
147 for (int index = 1; index < length; index++) {
148 // Each of the following case guarantees one more byte in the stream
149 // for the following tag or the access_flags following constant pool,
150 // so we don't need bounds-check for reading tag.
151 const u1 tag = cfs->get_u1_fast();
152 switch (tag) {
153 case JVM_CONSTANT_Class : {
154 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
155 const u2 name_index = cfs->get_u2_fast();
156 cp->klass_index_at_put(index, name_index);
157 break;
158 }
159 case JVM_CONSTANT_Fieldref: {
160 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
161 const u2 class_index = cfs->get_u2_fast();
162 const u2 name_and_type_index = cfs->get_u2_fast();
163 cp->field_at_put(index, class_index, name_and_type_index);
164 break;
165 }
166 case JVM_CONSTANT_Methodref: {
167 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
168 const u2 class_index = cfs->get_u2_fast();
169 const u2 name_and_type_index = cfs->get_u2_fast();
170 cp->method_at_put(index, class_index, name_and_type_index);
171 break;
172 }
173 case JVM_CONSTANT_InterfaceMethodref: {
174 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
175 const u2 class_index = cfs->get_u2_fast();
176 const u2 name_and_type_index = cfs->get_u2_fast();
177 cp->interface_method_at_put(index, class_index, name_and_type_index);
178 break;
179 }
180 case JVM_CONSTANT_String : {
181 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
182 const u2 string_index = cfs->get_u2_fast();
183 cp->string_index_at_put(index, string_index);
184 break;
185 }
186 case JVM_CONSTANT_MethodHandle :
187 case JVM_CONSTANT_MethodType: {
188 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
189 classfile_parse_error(
190 "Class file version does not support constant tag %u in class file %s",
191 tag, CHECK);
192 }
193 if (tag == JVM_CONSTANT_MethodHandle) {
194 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
195 const u1 ref_kind = cfs->get_u1_fast();
196 const u2 method_index = cfs->get_u2_fast();
197 cp->method_handle_index_at_put(index, ref_kind, method_index);
198 }
199 else if (tag == JVM_CONSTANT_MethodType) {
200 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
201 const u2 signature_index = cfs->get_u2_fast();
202 cp->method_type_index_at_put(index, signature_index);
203 }
204 else {
205 ShouldNotReachHere();
206 }
207 break;
208 }
209 case JVM_CONSTANT_Dynamic : {
210 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
211 classfile_parse_error(
212 "Class file version does not support constant tag %u in class file %s",
213 tag, CHECK);
214 }
215 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
216 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
219 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
220 }
221 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
222 break;
223 }
224 case JVM_CONSTANT_InvokeDynamic : {
225 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
226 classfile_parse_error(
227 "Class file version does not support constant tag %u in class file %s",
228 tag, CHECK);
229 }
230 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
231 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
232 const u2 name_and_type_index = cfs->get_u2_fast();
233 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
234 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
235 }
236 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
237 break;
238 }
239 case JVM_CONSTANT_Integer: {
240 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
241 const u4 bytes = cfs->get_u4_fast();
242 cp->int_at_put(index, (jint)bytes);
243 break;
244 }
245 case JVM_CONSTANT_Float: {
246 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
247 const u4 bytes = cfs->get_u4_fast();
248 cp->float_at_put(index, *(jfloat*)&bytes);
249 break;
250 }
251 case JVM_CONSTANT_Long: {
252 // A mangled type might cause you to overrun allocated memory
253 guarantee_property(index + 1 < length,
254 "Invalid constant pool entry %u in class file %s",
255 index,
256 CHECK);
257 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
258 const u8 bytes = cfs->get_u8_fast();
259 cp->long_at_put(index, bytes);
260 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
261 break;
262 }
263 case JVM_CONSTANT_Double: {
264 // A mangled type might cause you to overrun allocated memory
265 guarantee_property(index+1 < length,
266 "Invalid constant pool entry %u in class file %s",
267 index,
268 CHECK);
269 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
270 const u8 bytes = cfs->get_u8_fast();
271 cp->double_at_put(index, *(jdouble*)&bytes);
272 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
273 break;
274 }
275 case JVM_CONSTANT_NameAndType: {
276 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
277 const u2 name_index = cfs->get_u2_fast();
278 const u2 signature_index = cfs->get_u2_fast();
279 cp->name_and_type_at_put(index, name_index, signature_index);
280 break;
281 }
282 case JVM_CONSTANT_Utf8 : {
283 cfs->guarantee_more(2, CHECK); // utf8_length
284 u2 utf8_length = cfs->get_u2_fast();
285 const u1* utf8_buffer = cfs->current();
286 assert(utf8_buffer != NULL, "null utf8 buffer");
287 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
288 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
289 cfs->skip_u1_fast(utf8_length);
290
291 // Before storing the symbol, make sure it's legal
292 if (_need_verify) {
293 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
294 }
295
296 if (has_cp_patch_at(index)) {
297 Handle patch = clear_cp_patch_at(index);
298 guarantee_property(java_lang_String::is_instance(patch()),
299 "Illegal utf8 patch at %d in class file %s",
300 index,
301 CHECK);
302 const char* const str = java_lang_String::as_utf8_string(patch());
303 // (could use java_lang_String::as_symbol instead, but might as well batch them)
304 utf8_buffer = (const u1*) str;
305 utf8_length = (int) strlen(str);
306 }
307
308 unsigned int hash;
309 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
310 utf8_length,
311 hash);
312 if (result == NULL) {
313 names[names_count] = (const char*)utf8_buffer;
314 lengths[names_count] = utf8_length;
315 indices[names_count] = index;
316 hashValues[names_count++] = hash;
317 if (names_count == SymbolTable::symbol_alloc_batch_size) {
318 SymbolTable::new_symbols(_loader_data,
319 cp,
320 names_count,
321 names,
322 lengths,
323 indices,
324 hashValues,
325 CHECK);
326 names_count = 0;
327 }
328 } else {
329 cp->symbol_at_put(index, result);
330 }
331 break;
332 }
333 case 19:
334 case 20: {
335 // Record that an error occurred in these two cases but keep parsing so
336 // that ACC_Module can be checked for in the access_flags. Need to
337 // throw NoClassDefFoundError in that case.
338 if (_major_version >= JAVA_9_VERSION) {
339 cfs->guarantee_more(3, CHECK);
340 cfs->get_u2_fast();
341 set_class_bad_constant_seen(tag);
342 break;
343 }
344 }
345 default: {
346 classfile_parse_error("Unknown constant tag %u in class file %s",
347 tag,
348 CHECK);
349 break;
350 }
351 } // end of switch(tag)
352 } // end of for
353
354 // Allocate the remaining symbols
355 if (names_count > 0) {
356 SymbolTable::new_symbols(_loader_data,
357 cp,
358 names_count,
359 names,
360 lengths,
361 indices,
362 hashValues,
363 CHECK);
364 }
365
366 // Copy _current pointer of local copy back to stream.
367 assert(stream->current() == old_current, "non-exclusive use of stream");
368 stream->set_current(cfs1.current());
369
370 }
371
372 static inline bool valid_cp_range(int index, int length) {
373 return (index > 0 && index < length);
374 }
375
376 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
377 assert(cp != NULL, "invariant");
378 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
379 return cp->symbol_at(index);
380 }
381 return NULL;
382 }
383
384 #ifdef ASSERT
385 PRAGMA_DIAG_PUSH
386 PRAGMA_FORMAT_NONLITERAL_IGNORED
387 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
388 ResourceMark rm(THREAD);
389 fatal(msg, _class_name->as_C_string());
390 }
391
392 void ClassFileParser::report_assert_property_failure(const char* msg,
393 int index,
394 TRAPS) const {
395 ResourceMark rm(THREAD);
396 fatal(msg, index, _class_name->as_C_string());
397 }
398 PRAGMA_DIAG_POP
399 #endif
400
401 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
402 ConstantPool* const cp,
403 const int length,
404 TRAPS) {
405 assert(cp != NULL, "invariant");
406 assert(stream != NULL, "invariant");
407
408 // parsing constant pool entries
409 parse_constant_pool_entries(stream, cp, length, CHECK);
410 if (class_bad_constant_seen() != 0) {
411 // a bad CP entry has been detected previously so stop parsing and just return.
412 return;
413 }
414
415 int index = 1; // declared outside of loops for portability
416 int num_klasses = 0;
417
418 // first verification pass - validate cross references
419 // and fixup class and string constants
420 for (index = 1; index < length; index++) { // Index 0 is unused
421 const jbyte tag = cp->tag_at(index).value();
422 switch (tag) {
423 case JVM_CONSTANT_Class: {
424 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
425 break;
426 }
427 case JVM_CONSTANT_Fieldref:
428 // fall through
429 case JVM_CONSTANT_Methodref:
430 // fall through
431 case JVM_CONSTANT_InterfaceMethodref: {
432 if (!_need_verify) break;
433 const int klass_ref_index = cp->klass_ref_index_at(index);
434 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
435 check_property(valid_klass_reference_at(klass_ref_index),
436 "Invalid constant pool index %u in class file %s",
437 klass_ref_index, CHECK);
438 check_property(valid_cp_range(name_and_type_ref_index, length) &&
439 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
440 "Invalid constant pool index %u in class file %s",
441 name_and_type_ref_index, CHECK);
442 break;
443 }
444 case JVM_CONSTANT_String: {
445 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
446 break;
447 }
448 case JVM_CONSTANT_Integer:
449 break;
450 case JVM_CONSTANT_Float:
451 break;
452 case JVM_CONSTANT_Long:
453 case JVM_CONSTANT_Double: {
454 index++;
455 check_property(
456 (index < length && cp->tag_at(index).is_invalid()),
457 "Improper constant pool long/double index %u in class file %s",
458 index, CHECK);
459 break;
460 }
461 case JVM_CONSTANT_NameAndType: {
462 if (!_need_verify) break;
463 const int name_ref_index = cp->name_ref_index_at(index);
464 const int signature_ref_index = cp->signature_ref_index_at(index);
465 check_property(valid_symbol_at(name_ref_index),
466 "Invalid constant pool index %u in class file %s",
467 name_ref_index, CHECK);
468 check_property(valid_symbol_at(signature_ref_index),
469 "Invalid constant pool index %u in class file %s",
470 signature_ref_index, CHECK);
471 break;
472 }
473 case JVM_CONSTANT_Utf8:
474 break;
475 case JVM_CONSTANT_UnresolvedClass: // fall-through
476 case JVM_CONSTANT_UnresolvedClassInError: {
477 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
478 break;
479 }
480 case JVM_CONSTANT_ClassIndex: {
481 const int class_index = cp->klass_index_at(index);
482 check_property(valid_symbol_at(class_index),
483 "Invalid constant pool index %u in class file %s",
484 class_index, CHECK);
485 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
486 break;
487 }
488 case JVM_CONSTANT_StringIndex: {
489 const int string_index = cp->string_index_at(index);
490 check_property(valid_symbol_at(string_index),
491 "Invalid constant pool index %u in class file %s",
492 string_index, CHECK);
493 Symbol* const sym = cp->symbol_at(string_index);
494 cp->unresolved_string_at_put(index, sym);
495 break;
496 }
497 case JVM_CONSTANT_MethodHandle: {
498 const int ref_index = cp->method_handle_index_at(index);
499 check_property(valid_cp_range(ref_index, length),
500 "Invalid constant pool index %u in class file %s",
501 ref_index, CHECK);
502 const constantTag tag = cp->tag_at(ref_index);
503 const int ref_kind = cp->method_handle_ref_kind_at(index);
504
505 switch (ref_kind) {
506 case JVM_REF_getField:
507 case JVM_REF_getStatic:
508 case JVM_REF_putField:
509 case JVM_REF_putStatic: {
510 check_property(
511 tag.is_field(),
512 "Invalid constant pool index %u in class file %s (not a field)",
513 ref_index, CHECK);
514 break;
515 }
516 case JVM_REF_invokeVirtual:
517 case JVM_REF_newInvokeSpecial: {
518 check_property(
519 tag.is_method(),
520 "Invalid constant pool index %u in class file %s (not a method)",
521 ref_index, CHECK);
522 break;
523 }
524 case JVM_REF_invokeStatic:
525 case JVM_REF_invokeSpecial: {
526 check_property(
527 tag.is_method() ||
528 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
529 "Invalid constant pool index %u in class file %s (not a method)",
530 ref_index, CHECK);
531 break;
532 }
533 case JVM_REF_invokeInterface: {
534 check_property(
535 tag.is_interface_method(),
536 "Invalid constant pool index %u in class file %s (not an interface method)",
537 ref_index, CHECK);
538 break;
539 }
540 default: {
541 classfile_parse_error(
542 "Bad method handle kind at constant pool index %u in class file %s",
543 index, CHECK);
544 }
545 } // switch(refkind)
546 // Keep the ref_index unchanged. It will be indirected at link-time.
547 break;
548 } // case MethodHandle
549 case JVM_CONSTANT_MethodType: {
550 const int ref_index = cp->method_type_index_at(index);
551 check_property(valid_symbol_at(ref_index),
552 "Invalid constant pool index %u in class file %s",
553 ref_index, CHECK);
554 break;
555 }
556 case JVM_CONSTANT_Dynamic: {
557 const int name_and_type_ref_index =
558 cp->invoke_dynamic_name_and_type_ref_index_at(index);
559
560 check_property(valid_cp_range(name_and_type_ref_index, length) &&
561 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
562 "Invalid constant pool index %u in class file %s",
563 name_and_type_ref_index, CHECK);
564 // bootstrap specifier index must be checked later,
565 // when BootstrapMethods attr is available
566
567 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
568 cp->set_has_dynamic_constant();
569 break;
570 }
571 case JVM_CONSTANT_InvokeDynamic: {
572 const int name_and_type_ref_index =
573 cp->invoke_dynamic_name_and_type_ref_index_at(index);
574
575 check_property(valid_cp_range(name_and_type_ref_index, length) &&
576 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
577 "Invalid constant pool index %u in class file %s",
578 name_and_type_ref_index, CHECK);
579 // bootstrap specifier index must be checked later,
580 // when BootstrapMethods attr is available
581 break;
582 }
583 default: {
584 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
585 ShouldNotReachHere();
586 break;
587 }
588 } // switch(tag)
589 } // end of for
590
591 _first_patched_klass_resolved_index = num_klasses;
592 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
593
594 if (_cp_patches != NULL) {
595 // need to treat this_class specially...
596
597 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
598 // for now. These will be replaced with actual names of the patched classes in patch_class().
599 Symbol* s = vmSymbols::star_name();
600 for (int n=_orig_cp_size; n<cp->length(); n++) {
601 cp->symbol_at_put(n, s);
602 }
603
604 int this_class_index;
605 {
606 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
607 const u1* const mark = stream->current();
608 stream->skip_u2_fast(1); // skip flags
609 this_class_index = stream->get_u2_fast();
610 stream->set_current(mark); // revert to mark
611 }
612
613 for (index = 1; index < length; index++) { // Index 0 is unused
614 if (has_cp_patch_at(index)) {
615 guarantee_property(index != this_class_index,
616 "Illegal constant pool patch to self at %d in class file %s",
617 index, CHECK);
618 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
619 }
620 }
621 }
622
623 if (!_need_verify) {
624 return;
625 }
626
627 // second verification pass - checks the strings are of the right format.
628 // but not yet to the other entries
629 for (index = 1; index < length; index++) {
630 const jbyte tag = cp->tag_at(index).value();
631 switch (tag) {
632 case JVM_CONSTANT_UnresolvedClass: {
633 const Symbol* const class_name = cp->klass_name_at(index);
634 // check the name, even if _cp_patches will overwrite it
635 verify_legal_class_name(class_name, CHECK);
636 break;
637 }
638 case JVM_CONSTANT_NameAndType: {
639 if (_need_verify) {
640 const int sig_index = cp->signature_ref_index_at(index);
641 const int name_index = cp->name_ref_index_at(index);
642 const Symbol* const name = cp->symbol_at(name_index);
643 const Symbol* const sig = cp->symbol_at(sig_index);
644 guarantee_property(sig->utf8_length() != 0,
645 "Illegal zero length constant pool entry at %d in class %s",
646 sig_index, CHECK);
647 guarantee_property(name->utf8_length() != 0,
648 "Illegal zero length constant pool entry at %d in class %s",
649 name_index, CHECK);
650
651 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
652 // Format check method name and signature
653 verify_legal_method_name(name, CHECK);
654 verify_legal_method_signature(name, sig, CHECK);
655 } else {
656 // Format check field name and signature
657 verify_legal_field_name(name, CHECK);
658 verify_legal_field_signature(name, sig, CHECK);
659 }
660 }
661 break;
662 }
663 case JVM_CONSTANT_Dynamic: {
664 const int name_and_type_ref_index =
665 cp->name_and_type_ref_index_at(index);
666 // already verified to be utf8
667 const int name_ref_index =
668 cp->name_ref_index_at(name_and_type_ref_index);
669 // already verified to be utf8
670 const int signature_ref_index =
671 cp->signature_ref_index_at(name_and_type_ref_index);
672 const Symbol* const name = cp->symbol_at(name_ref_index);
673 const Symbol* const signature = cp->symbol_at(signature_ref_index);
674 if (_need_verify) {
675 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
676 // Need only to be sure signature is non-zero length and the right type.
677 if (signature->utf8_length() == 0 ||
678 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
679 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
680 }
681 }
682 break;
683 }
684 case JVM_CONSTANT_InvokeDynamic:
685 case JVM_CONSTANT_Fieldref:
686 case JVM_CONSTANT_Methodref:
687 case JVM_CONSTANT_InterfaceMethodref: {
688 const int name_and_type_ref_index =
689 cp->name_and_type_ref_index_at(index);
690 // already verified to be utf8
691 const int name_ref_index =
692 cp->name_ref_index_at(name_and_type_ref_index);
693 // already verified to be utf8
694 const int signature_ref_index =
695 cp->signature_ref_index_at(name_and_type_ref_index);
696 const Symbol* const name = cp->symbol_at(name_ref_index);
697 const Symbol* const signature = cp->symbol_at(signature_ref_index);
698 if (tag == JVM_CONSTANT_Fieldref) {
699 if (_need_verify) {
700 // Field name and signature are verified above, when iterating NameAndType_info.
701 // Need only to be sure signature is non-zero length and the right type.
702 if (signature->utf8_length() == 0 ||
703 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
704 throwIllegalSignature("Field", name, signature, CHECK);
705 }
706 }
707 } else {
708 if (_need_verify) {
709 // Method name and signature are verified above, when iterating NameAndType_info.
710 // Need only to be sure signature is non-zero length and the right type.
711 if (signature->utf8_length() == 0 ||
712 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
713 throwIllegalSignature("Method", name, signature, CHECK);
714 }
715 }
716 // 4509014: If a class method name begins with '<', it must be "<init>"
717 const unsigned int name_len = name->utf8_length();
718 if (tag == JVM_CONSTANT_Methodref &&
719 name_len != 0 &&
720 name->byte_at(0) == '<' &&
721 name != vmSymbols::object_initializer_name()) {
722 classfile_parse_error(
723 "Bad method name at constant pool index %u in class file %s",
724 name_ref_index, CHECK);
725 }
726 }
727 break;
728 }
729 case JVM_CONSTANT_MethodHandle: {
730 const int ref_index = cp->method_handle_index_at(index);
731 const int ref_kind = cp->method_handle_ref_kind_at(index);
732 switch (ref_kind) {
733 case JVM_REF_invokeVirtual:
734 case JVM_REF_invokeStatic:
735 case JVM_REF_invokeSpecial:
736 case JVM_REF_newInvokeSpecial: {
737 const int name_and_type_ref_index =
738 cp->name_and_type_ref_index_at(ref_index);
739 const int name_ref_index =
740 cp->name_ref_index_at(name_and_type_ref_index);
741 const Symbol* const name = cp->symbol_at(name_ref_index);
742 if (ref_kind == JVM_REF_newInvokeSpecial) {
743 if (name != vmSymbols::object_initializer_name()) {
744 classfile_parse_error(
745 "Bad constructor name at constant pool index %u in class file %s",
746 name_ref_index, CHECK);
747 }
748 } else {
749 if (name == vmSymbols::object_initializer_name()) {
750 classfile_parse_error(
751 "Bad method name at constant pool index %u in class file %s",
752 name_ref_index, CHECK);
753 }
754 }
755 break;
756 }
757 // Other ref_kinds are already fully checked in previous pass.
758 } // switch(ref_kind)
759 break;
760 }
761 case JVM_CONSTANT_MethodType: {
762 const Symbol* const no_name = vmSymbols::type_name(); // place holder
763 const Symbol* const signature = cp->method_type_signature_at(index);
764 verify_legal_method_signature(no_name, signature, CHECK);
765 break;
766 }
767 case JVM_CONSTANT_Utf8: {
768 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
769 }
770 } // switch(tag)
771 } // end of for
772 }
773
774 Handle ClassFileParser::clear_cp_patch_at(int index) {
775 Handle patch = cp_patch_at(index);
776 _cp_patches->at_put(index, Handle());
777 assert(!has_cp_patch_at(index), "");
778 return patch;
779 }
780
781 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
782 int name_index = _orig_cp_size + _num_patched_klasses;
783 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
784
785 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
786 _num_patched_klasses ++;
787 }
788
789 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
790 int index,
791 Handle patch,
792 TRAPS) {
793 assert(cp != NULL, "invariant");
794
795 BasicType patch_type = T_VOID;
796
797 switch (cp->tag_at(index).value()) {
798
799 case JVM_CONSTANT_UnresolvedClass: {
800 // Patching a class means pre-resolving it.
801 // The name in the constant pool is ignored.
802 if (java_lang_Class::is_instance(patch())) {
803 guarantee_property(!java_lang_Class::is_primitive(patch()),
804 "Illegal class patch at %d in class file %s",
805 index, CHECK);
806 Klass* k = java_lang_Class::as_Klass(patch());
807 patch_class(cp, index, k, k->name());
808 } else {
809 guarantee_property(java_lang_String::is_instance(patch()),
810 "Illegal class patch at %d in class file %s",
811 index, CHECK);
812 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
813 patch_class(cp, index, NULL, name);
814 }
815 break;
816 }
817
818 case JVM_CONSTANT_String: {
819 // skip this patch and don't clear it. Needs the oop array for resolved
820 // references to be created first.
821 return;
822 }
823 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
824 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
825 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
826 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
827 patch_prim:
828 {
829 jvalue value;
830 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
831 guarantee_property(value_type == patch_type,
832 "Illegal primitive patch at %d in class file %s",
833 index, CHECK);
834 switch (value_type) {
835 case T_INT: cp->int_at_put(index, value.i); break;
836 case T_FLOAT: cp->float_at_put(index, value.f); break;
837 case T_LONG: cp->long_at_put(index, value.j); break;
838 case T_DOUBLE: cp->double_at_put(index, value.d); break;
839 default: assert(false, "");
840 }
841 } // end patch_prim label
842 break;
843
844 default: {
845 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
846 guarantee_property(!has_cp_patch_at(index),
847 "Illegal unexpected patch at %d in class file %s",
848 index, CHECK);
849 return;
850 }
851 } // end of switch(tag)
852
853 // On fall-through, mark the patch as used.
854 clear_cp_patch_at(index);
855 }
856 class NameSigHash: public ResourceObj {
857 public:
858 const Symbol* _name; // name
859 const Symbol* _sig; // signature
860 NameSigHash* _next; // Next entry in hash table
861 };
862
863 static const int HASH_ROW_SIZE = 256;
864
865 static unsigned int hash(const Symbol* name, const Symbol* sig) {
866 unsigned int raw_hash = 0;
867 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
868 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
869
870 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
871 }
872
873
874 static void initialize_hashtable(NameSigHash** table) {
875 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
876 }
877 // Return false if the name/sig combination is found in table.
878 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
879 // The old format checker uses heap sort to find duplicates.
880 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
881 // of table since we don't expect Symbol*'s to move.
882 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
883 assert(name != NULL, "name in constant pool is NULL");
884
885 // First lookup for duplicates
886 int index = hash(name, sig);
887 NameSigHash* entry = table[index];
888 while (entry != NULL) {
889 if (entry->_name == name && entry->_sig == sig) {
890 return false;
891 }
892 entry = entry->_next;
893 }
894
895 // No duplicate is found, allocate a new entry and fill it.
896 entry = new NameSigHash();
897 entry->_name = name;
898 entry->_sig = sig;
899
900 // Insert into hash table
901 entry->_next = table[index];
902 table[index] = entry;
903
904 return true;
905 }
906
907 // Side-effects: populates the _local_interfaces field
908 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
909 const int itfs_len,
910 ConstantPool* const cp,
911 bool* const has_nonstatic_concrete_methods,
912 TRAPS) {
913 assert(stream != NULL, "invariant");
914 assert(cp != NULL, "invariant");
915 assert(has_nonstatic_concrete_methods != NULL, "invariant");
916
917 if (itfs_len == 0) {
918 _local_interfaces = Universe::the_empty_klass_array();
919 } else {
920 assert(itfs_len > 0, "only called for len>0");
921 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
922
923 int index;
924 for (index = 0; index < itfs_len; index++) {
925 const u2 interface_index = stream->get_u2(CHECK);
926 Klass* interf;
927 check_property(
928 valid_klass_reference_at(interface_index),
929 "Interface name has bad constant pool index %u in class file %s",
930 interface_index, CHECK);
931 if (cp->tag_at(interface_index).is_klass()) {
932 interf = cp->resolved_klass_at(interface_index);
933 } else {
934 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
935
936 // Don't need to check legal name because it's checked when parsing constant pool.
937 // But need to make sure it's not an array type.
938 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
939 "Bad interface name in class file %s", CHECK);
940
941 // Call resolve_super so classcircularity is checked
942 interf = SystemDictionary::resolve_super_or_fail(
943 _class_name,
944 unresolved_klass,
945 Handle(THREAD, _loader_data->class_loader()),
946 _protection_domain,
947 false,
948 CHECK);
949 }
950
951 if (!interf->is_interface()) {
952 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
953 "Implementing class");
954 }
955
956 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
957 *has_nonstatic_concrete_methods = true;
958 }
959 _local_interfaces->at_put(index, interf);
960 }
961
962 if (!_need_verify || itfs_len <= 1) {
963 return;
964 }
965
966 // Check if there's any duplicates in interfaces
967 ResourceMark rm(THREAD);
968 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
969 NameSigHash*,
970 HASH_ROW_SIZE);
971 initialize_hashtable(interface_names);
972 bool dup = false;
973 const Symbol* name = NULL;
974 {
975 debug_only(NoSafepointVerifier nsv;)
976 for (index = 0; index < itfs_len; index++) {
977 const Klass* const k = _local_interfaces->at(index);
978 name = InstanceKlass::cast(k)->name();
979 // If no duplicates, add (name, NULL) in hashtable interface_names.
980 if (!put_after_lookup(name, NULL, interface_names)) {
981 dup = true;
982 break;
983 }
984 }
985 }
986 if (dup) {
987 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
988 name->as_C_string(), CHECK);
989 }
990 }
991 }
992
993 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
994 int constantvalue_index,
995 int signature_index,
996 TRAPS) const {
997 // Make sure the constant pool entry is of a type appropriate to this field
998 guarantee_property(
999 (constantvalue_index > 0 &&
1000 constantvalue_index < cp->length()),
1001 "Bad initial value index %u in ConstantValue attribute in class file %s",
1002 constantvalue_index, CHECK);
1003
1004 const constantTag value_type = cp->tag_at(constantvalue_index);
1005 switch(cp->basic_type_for_signature_at(signature_index)) {
1006 case T_LONG: {
1007 guarantee_property(value_type.is_long(),
1008 "Inconsistent constant value type in class file %s",
1009 CHECK);
1010 break;
1011 }
1012 case T_FLOAT: {
1013 guarantee_property(value_type.is_float(),
1014 "Inconsistent constant value type in class file %s",
1015 CHECK);
1016 break;
1017 }
1018 case T_DOUBLE: {
1019 guarantee_property(value_type.is_double(),
1020 "Inconsistent constant value type in class file %s",
1021 CHECK);
1022 break;
1023 }
1024 case T_BYTE:
1025 case T_CHAR:
1026 case T_SHORT:
1027 case T_BOOLEAN:
1028 case T_INT: {
1029 guarantee_property(value_type.is_int(),
1030 "Inconsistent constant value type in class file %s",
1031 CHECK);
1032 break;
1033 }
1034 case T_OBJECT: {
1035 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1036 && value_type.is_string()),
1037 "Bad string initial value in class file %s",
1038 CHECK);
1039 break;
1040 }
1041 default: {
1042 classfile_parse_error("Unable to set initial value %u in class file %s",
1043 constantvalue_index,
1044 CHECK);
1045 }
1046 }
1047 }
1048
1049 class AnnotationCollector : public ResourceObj{
1050 public:
1051 enum Location { _in_field, _in_method, _in_class };
1052 enum ID {
1053 _unknown = 0,
1054 _method_CallerSensitive,
1055 _method_ForceInline,
1056 _method_DontInline,
1057 _method_InjectedProfile,
1058 _method_LambdaForm_Compiled,
1059 _method_LambdaForm_Hidden,
1060 _method_HotSpotIntrinsicCandidate,
1061 _jdk_internal_vm_annotation_Contended,
1062 _field_Stable,
1063 _jdk_internal_vm_annotation_ReservedStackAccess,
1064 _annotation_LIMIT
1065 };
1066 const Location _location;
1067 int _annotations_present;
1068 u2 _contended_group;
1069
1070 AnnotationCollector(Location location)
1071 : _location(location), _annotations_present(0)
1072 {
1073 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1074 }
1075 // If this annotation name has an ID, report it (or _none).
1076 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1077 // Set the annotation name:
1078 void set_annotation(ID id) {
1079 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1080 _annotations_present |= nth_bit((int)id);
1081 }
1082
1083 void remove_annotation(ID id) {
1084 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1085 _annotations_present &= ~nth_bit((int)id);
1086 }
1087
1088 // Report if the annotation is present.
1089 bool has_any_annotations() const { return _annotations_present != 0; }
1090 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1091
1092 void set_contended_group(u2 group) { _contended_group = group; }
1093 u2 contended_group() const { return _contended_group; }
1094
1095 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1096
1097 void set_stable(bool stable) { set_annotation(_field_Stable); }
1098 bool is_stable() const { return has_annotation(_field_Stable); }
1099 };
1100
1101 // This class also doubles as a holder for metadata cleanup.
1102 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1103 private:
1104 ClassLoaderData* _loader_data;
1105 AnnotationArray* _field_annotations;
1106 AnnotationArray* _field_type_annotations;
1107 public:
1108 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1109 AnnotationCollector(_in_field),
1110 _loader_data(loader_data),
1111 _field_annotations(NULL),
1112 _field_type_annotations(NULL) {}
1113 ~FieldAnnotationCollector();
1114 void apply_to(FieldInfo* f);
1115 AnnotationArray* field_annotations() { return _field_annotations; }
1116 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1117
1118 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1119 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1120 };
1121
1122 class MethodAnnotationCollector : public AnnotationCollector{
1123 public:
1124 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1125 void apply_to(const methodHandle& m);
1126 };
1127
1128 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1129 public:
1130 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1131 void apply_to(InstanceKlass* ik);
1132 };
1133
1134
1135 static int skip_annotation_value(const u1*, int, int); // fwd decl
1136
1137 // Safely increment index by val if does not pass limit
1138 #define SAFE_ADD(index, limit, val) \
1139 if (index >= limit - val) return limit; \
1140 index += val;
1141
1142 // Skip an annotation. Return >=limit if there is any problem.
1143 static int skip_annotation(const u1* buffer, int limit, int index) {
1144 assert(buffer != NULL, "invariant");
1145 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1146 // value := switch (tag:u1) { ... }
1147 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1148 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1149 while (--nmem >= 0 && index < limit) {
1150 SAFE_ADD(index, limit, 2); // skip member
1151 index = skip_annotation_value(buffer, limit, index);
1152 }
1153 return index;
1154 }
1155
1156 // Skip an annotation value. Return >=limit if there is any problem.
1157 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1158 assert(buffer != NULL, "invariant");
1159
1160 // value := switch (tag:u1) {
1161 // case B, C, I, S, Z, D, F, J, c: con:u2;
1162 // case e: e_class:u2 e_name:u2;
1163 // case s: s_con:u2;
1164 // case [: do(nval:u2) {value};
1165 // case @: annotation;
1166 // case s: s_con:u2;
1167 // }
1168 SAFE_ADD(index, limit, 1); // read tag
1169 const u1 tag = buffer[index - 1];
1170 switch (tag) {
1171 case 'B':
1172 case 'C':
1173 case 'I':
1174 case 'S':
1175 case 'Z':
1176 case 'D':
1177 case 'F':
1178 case 'J':
1179 case 'c':
1180 case 's':
1181 SAFE_ADD(index, limit, 2); // skip con or s_con
1182 break;
1183 case 'e':
1184 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1185 break;
1186 case '[':
1187 {
1188 SAFE_ADD(index, limit, 2); // read nval
1189 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1190 while (--nval >= 0 && index < limit) {
1191 index = skip_annotation_value(buffer, limit, index);
1192 }
1193 }
1194 break;
1195 case '@':
1196 index = skip_annotation(buffer, limit, index);
1197 break;
1198 default:
1199 return limit; // bad tag byte
1200 }
1201 return index;
1202 }
1203
1204 // Sift through annotations, looking for those significant to the VM:
1205 static void parse_annotations(const ConstantPool* const cp,
1206 const u1* buffer, int limit,
1207 AnnotationCollector* coll,
1208 ClassLoaderData* loader_data,
1209 TRAPS) {
1210
1211 assert(cp != NULL, "invariant");
1212 assert(buffer != NULL, "invariant");
1213 assert(coll != NULL, "invariant");
1214 assert(loader_data != NULL, "invariant");
1215
1216 // annotations := do(nann:u2) {annotation}
1217 int index = 2; // read nann
1218 if (index >= limit) return;
1219 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1220 enum { // initial annotation layout
1221 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1222 count_off = 2, // u2 such as 1 (one value)
1223 member_off = 4, // utf8 such as 'value'
1224 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1225 e_tag_val = 'e',
1226 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1227 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1228 e_size = 11, // end of 'e' annotation
1229 c_tag_val = 'c', // payload is type
1230 c_con_off = 7, // utf8 payload, such as 'I'
1231 c_size = 9, // end of 'c' annotation
1232 s_tag_val = 's', // payload is String
1233 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1234 s_size = 9,
1235 min_size = 6 // smallest possible size (zero members)
1236 };
1237 // Cannot add min_size to index in case of overflow MAX_INT
1238 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1239 int index0 = index;
1240 index = skip_annotation(buffer, limit, index);
1241 const u1* const abase = buffer + index0;
1242 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1243 const int count = Bytes::get_Java_u2((address)abase + count_off);
1244 const Symbol* const aname = check_symbol_at(cp, atype);
1245 if (aname == NULL) break; // invalid annotation name
1246 const Symbol* member = NULL;
1247 if (count >= 1) {
1248 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1249 member = check_symbol_at(cp, member_index);
1250 if (member == NULL) break; // invalid member name
1251 }
1252
1253 // Here is where parsing particular annotations will take place.
1254 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1255 if (AnnotationCollector::_unknown == id) continue;
1256 coll->set_annotation(id);
1257
1258 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1259 // @Contended can optionally specify the contention group.
1260 //
1261 // Contended group defines the equivalence class over the fields:
1262 // the fields within the same contended group are not treated distinct.
1263 // The only exception is default group, which does not incur the
1264 // equivalence. Naturally, contention group for classes is meaningless.
1265 //
1266 // While the contention group is specified as String, annotation
1267 // values are already interned, and we might as well use the constant
1268 // pool index as the group tag.
1269 //
1270 u2 group_index = 0; // default contended group
1271 if (count == 1
1272 && s_size == (index - index0) // match size
1273 && s_tag_val == *(abase + tag_off)
1274 && member == vmSymbols::value_name()) {
1275 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1276 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1277 group_index = 0; // default contended group
1278 }
1279 }
1280 coll->set_contended_group(group_index);
1281 }
1282 }
1283 }
1284
1285
1286 // Parse attributes for a field.
1287 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1288 u2 attributes_count,
1289 bool is_static, u2 signature_index,
1290 u2* const constantvalue_index_addr,
1291 bool* const is_synthetic_addr,
1292 u2* const generic_signature_index_addr,
1293 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1294 TRAPS) {
1295 assert(cfs != NULL, "invariant");
1296 assert(constantvalue_index_addr != NULL, "invariant");
1297 assert(is_synthetic_addr != NULL, "invariant");
1298 assert(generic_signature_index_addr != NULL, "invariant");
1299 assert(parsed_annotations != NULL, "invariant");
1300 assert(attributes_count > 0, "attributes_count should be greater than 0");
1301
1302 u2 constantvalue_index = 0;
1303 u2 generic_signature_index = 0;
1304 bool is_synthetic = false;
1305 const u1* runtime_visible_annotations = NULL;
1306 int runtime_visible_annotations_length = 0;
1307 const u1* runtime_invisible_annotations = NULL;
1308 int runtime_invisible_annotations_length = 0;
1309 const u1* runtime_visible_type_annotations = NULL;
1310 int runtime_visible_type_annotations_length = 0;
1311 const u1* runtime_invisible_type_annotations = NULL;
1312 int runtime_invisible_type_annotations_length = 0;
1313 bool runtime_invisible_annotations_exists = false;
1314 bool runtime_invisible_type_annotations_exists = false;
1315 const ConstantPool* const cp = _cp;
1316
1317 while (attributes_count--) {
1318 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1319 const u2 attribute_name_index = cfs->get_u2_fast();
1320 const u4 attribute_length = cfs->get_u4_fast();
1321 check_property(valid_symbol_at(attribute_name_index),
1322 "Invalid field attribute index %u in class file %s",
1323 attribute_name_index,
1324 CHECK);
1325
1326 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1327 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1328 // ignore if non-static
1329 if (constantvalue_index != 0) {
1330 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1331 }
1332 check_property(
1333 attribute_length == 2,
1334 "Invalid ConstantValue field attribute length %u in class file %s",
1335 attribute_length, CHECK);
1336
1337 constantvalue_index = cfs->get_u2(CHECK);
1338 if (_need_verify) {
1339 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1340 }
1341 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1342 if (attribute_length != 0) {
1343 classfile_parse_error(
1344 "Invalid Synthetic field attribute length %u in class file %s",
1345 attribute_length, CHECK);
1346 }
1347 is_synthetic = true;
1348 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1349 if (attribute_length != 0) {
1350 classfile_parse_error(
1351 "Invalid Deprecated field attribute length %u in class file %s",
1352 attribute_length, CHECK);
1353 }
1354 } else if (_major_version >= JAVA_1_5_VERSION) {
1355 if (attribute_name == vmSymbols::tag_signature()) {
1356 if (generic_signature_index != 0) {
1357 classfile_parse_error(
1358 "Multiple Signature attributes for field in class file %s", CHECK);
1359 }
1360 if (attribute_length != 2) {
1361 classfile_parse_error(
1362 "Wrong size %u for field's Signature attribute in class file %s",
1363 attribute_length, CHECK);
1364 }
1365 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1366 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1367 if (runtime_visible_annotations != NULL) {
1368 classfile_parse_error(
1369 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1370 }
1371 runtime_visible_annotations_length = attribute_length;
1372 runtime_visible_annotations = cfs->current();
1373 assert(runtime_visible_annotations != NULL, "null visible annotations");
1374 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1375 parse_annotations(cp,
1376 runtime_visible_annotations,
1377 runtime_visible_annotations_length,
1378 parsed_annotations,
1379 _loader_data,
1380 CHECK);
1381 cfs->skip_u1_fast(runtime_visible_annotations_length);
1382 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1383 if (runtime_invisible_annotations_exists) {
1384 classfile_parse_error(
1385 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1386 }
1387 runtime_invisible_annotations_exists = true;
1388 if (PreserveAllAnnotations) {
1389 runtime_invisible_annotations_length = attribute_length;
1390 runtime_invisible_annotations = cfs->current();
1391 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1392 }
1393 cfs->skip_u1(attribute_length, CHECK);
1394 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1395 if (runtime_visible_type_annotations != NULL) {
1396 classfile_parse_error(
1397 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1398 }
1399 runtime_visible_type_annotations_length = attribute_length;
1400 runtime_visible_type_annotations = cfs->current();
1401 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1402 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1403 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1404 if (runtime_invisible_type_annotations_exists) {
1405 classfile_parse_error(
1406 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1407 } else {
1408 runtime_invisible_type_annotations_exists = true;
1409 }
1410 if (PreserveAllAnnotations) {
1411 runtime_invisible_type_annotations_length = attribute_length;
1412 runtime_invisible_type_annotations = cfs->current();
1413 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1414 }
1415 cfs->skip_u1(attribute_length, CHECK);
1416 } else {
1417 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1418 }
1419 } else {
1420 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1421 }
1422 }
1423
1424 *constantvalue_index_addr = constantvalue_index;
1425 *is_synthetic_addr = is_synthetic;
1426 *generic_signature_index_addr = generic_signature_index;
1427 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1428 runtime_visible_annotations_length,
1429 runtime_invisible_annotations,
1430 runtime_invisible_annotations_length,
1431 CHECK);
1432 parsed_annotations->set_field_annotations(a);
1433 a = assemble_annotations(runtime_visible_type_annotations,
1434 runtime_visible_type_annotations_length,
1435 runtime_invisible_type_annotations,
1436 runtime_invisible_type_annotations_length,
1437 CHECK);
1438 parsed_annotations->set_field_type_annotations(a);
1439 return;
1440 }
1441
1442
1443 // Field allocation types. Used for computing field offsets.
1444
1445 enum FieldAllocationType {
1446 STATIC_OOP, // Oops
1447 STATIC_BYTE, // Boolean, Byte, char
1448 STATIC_SHORT, // shorts
1449 STATIC_WORD, // ints
1450 STATIC_DOUBLE, // aligned long or double
1451 NONSTATIC_OOP,
1452 NONSTATIC_BYTE,
1453 NONSTATIC_SHORT,
1454 NONSTATIC_WORD,
1455 NONSTATIC_DOUBLE,
1456 MAX_FIELD_ALLOCATION_TYPE,
1457 BAD_ALLOCATION_TYPE = -1
1458 };
1459
1460 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1461 BAD_ALLOCATION_TYPE, // 0
1462 BAD_ALLOCATION_TYPE, // 1
1463 BAD_ALLOCATION_TYPE, // 2
1464 BAD_ALLOCATION_TYPE, // 3
1465 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1466 NONSTATIC_SHORT, // T_CHAR = 5,
1467 NONSTATIC_WORD, // T_FLOAT = 6,
1468 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1469 NONSTATIC_BYTE, // T_BYTE = 8,
1470 NONSTATIC_SHORT, // T_SHORT = 9,
1471 NONSTATIC_WORD, // T_INT = 10,
1472 NONSTATIC_DOUBLE, // T_LONG = 11,
1473 NONSTATIC_OOP, // T_OBJECT = 12,
1474 NONSTATIC_OOP, // T_ARRAY = 13,
1475 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1476 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1477 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1478 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1479 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1480 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1481 BAD_ALLOCATION_TYPE, // 0
1482 BAD_ALLOCATION_TYPE, // 1
1483 BAD_ALLOCATION_TYPE, // 2
1484 BAD_ALLOCATION_TYPE, // 3
1485 STATIC_BYTE , // T_BOOLEAN = 4,
1486 STATIC_SHORT, // T_CHAR = 5,
1487 STATIC_WORD, // T_FLOAT = 6,
1488 STATIC_DOUBLE, // T_DOUBLE = 7,
1489 STATIC_BYTE, // T_BYTE = 8,
1490 STATIC_SHORT, // T_SHORT = 9,
1491 STATIC_WORD, // T_INT = 10,
1492 STATIC_DOUBLE, // T_LONG = 11,
1493 STATIC_OOP, // T_OBJECT = 12,
1494 STATIC_OOP, // T_ARRAY = 13,
1495 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1496 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1497 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1498 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1499 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1500 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1501 };
1502
1503 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1504 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1505 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1506 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1507 return result;
1508 }
1509
1510 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1511 public:
1512 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1513
1514 FieldAllocationCount() {
1515 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1516 count[i] = 0;
1517 }
1518 }
1519
1520 FieldAllocationType update(bool is_static, BasicType type) {
1521 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1522 if (atype != BAD_ALLOCATION_TYPE) {
1523 // Make sure there is no overflow with injected fields.
1524 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1525 count[atype]++;
1526 }
1527 return atype;
1528 }
1529 };
1530
1531 // Side-effects: populates the _fields, _fields_annotations,
1532 // _fields_type_annotations fields
1533 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1534 bool is_interface,
1535 FieldAllocationCount* const fac,
1536 ConstantPool* cp,
1537 const int cp_size,
1538 u2* const java_fields_count_ptr,
1539 TRAPS) {
1540
1541 assert(cfs != NULL, "invariant");
1542 assert(fac != NULL, "invariant");
1543 assert(cp != NULL, "invariant");
1544 assert(java_fields_count_ptr != NULL, "invariant");
1545
1546 assert(NULL == _fields, "invariant");
1547 assert(NULL == _fields_annotations, "invariant");
1548 assert(NULL == _fields_type_annotations, "invariant");
1549
1550 cfs->guarantee_more(2, CHECK); // length
1551 const u2 length = cfs->get_u2_fast();
1552 *java_fields_count_ptr = length;
1553
1554 int num_injected = 0;
1555 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1556 &num_injected);
1557 const int total_fields = length + num_injected;
1558
1559 // The field array starts with tuples of shorts
1560 // [access, name index, sig index, initial value index, byte offset].
1561 // A generic signature slot only exists for field with generic
1562 // signature attribute. And the access flag is set with
1563 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1564 // signature slots are at the end of the field array and after all
1565 // other fields data.
1566 //
1567 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1568 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1569 // ...
1570 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1571 // [generic signature index]
1572 // [generic signature index]
1573 // ...
1574 //
1575 // Allocate a temporary resource array for field data. For each field,
1576 // a slot is reserved in the temporary array for the generic signature
1577 // index. After parsing all fields, the data are copied to a permanent
1578 // array and any unused slots will be discarded.
1579 ResourceMark rm(THREAD);
1580 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1581 u2,
1582 total_fields * (FieldInfo::field_slots + 1));
1583
1584 // The generic signature slots start after all other fields' data.
1585 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1586 int num_generic_signature = 0;
1587 for (int n = 0; n < length; n++) {
1588 // access_flags, name_index, descriptor_index, attributes_count
1589 cfs->guarantee_more(8, CHECK);
1590
1591 AccessFlags access_flags;
1592 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1593 verify_legal_field_modifiers(flags, is_interface, CHECK);
1594 access_flags.set_flags(flags);
1595
1596 const u2 name_index = cfs->get_u2_fast();
1597 check_property(valid_symbol_at(name_index),
1598 "Invalid constant pool index %u for field name in class file %s",
1599 name_index, CHECK);
1600 const Symbol* const name = cp->symbol_at(name_index);
1601 verify_legal_field_name(name, CHECK);
1602
1603 const u2 signature_index = cfs->get_u2_fast();
1604 check_property(valid_symbol_at(signature_index),
1605 "Invalid constant pool index %u for field signature in class file %s",
1606 signature_index, CHECK);
1607 const Symbol* const sig = cp->symbol_at(signature_index);
1608 verify_legal_field_signature(name, sig, CHECK);
1609
1610 u2 constantvalue_index = 0;
1611 bool is_synthetic = false;
1612 u2 generic_signature_index = 0;
1613 const bool is_static = access_flags.is_static();
1614 FieldAnnotationCollector parsed_annotations(_loader_data);
1615
1616 const u2 attributes_count = cfs->get_u2_fast();
1617 if (attributes_count > 0) {
1618 parse_field_attributes(cfs,
1619 attributes_count,
1620 is_static,
1621 signature_index,
1622 &constantvalue_index,
1623 &is_synthetic,
1624 &generic_signature_index,
1625 &parsed_annotations,
1626 CHECK);
1627
1628 if (parsed_annotations.field_annotations() != NULL) {
1629 if (_fields_annotations == NULL) {
1630 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1631 _loader_data, length, NULL,
1632 CHECK);
1633 }
1634 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1635 parsed_annotations.set_field_annotations(NULL);
1636 }
1637 if (parsed_annotations.field_type_annotations() != NULL) {
1638 if (_fields_type_annotations == NULL) {
1639 _fields_type_annotations =
1640 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1641 length,
1642 NULL,
1643 CHECK);
1644 }
1645 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1646 parsed_annotations.set_field_type_annotations(NULL);
1647 }
1648
1649 if (is_synthetic) {
1650 access_flags.set_is_synthetic();
1651 }
1652 if (generic_signature_index != 0) {
1653 access_flags.set_field_has_generic_signature();
1654 fa[generic_signature_slot] = generic_signature_index;
1655 generic_signature_slot ++;
1656 num_generic_signature ++;
1657 }
1658 }
1659
1660 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1661 field->initialize(access_flags.as_short(),
1662 name_index,
1663 signature_index,
1664 constantvalue_index);
1665 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1666
1667 // Remember how many oops we encountered and compute allocation type
1668 const FieldAllocationType atype = fac->update(is_static, type);
1669 field->set_allocation_type(atype);
1670
1671 // After field is initialized with type, we can augment it with aux info
1672 if (parsed_annotations.has_any_annotations())
1673 parsed_annotations.apply_to(field);
1674 }
1675
1676 int index = length;
1677 if (num_injected != 0) {
1678 for (int n = 0; n < num_injected; n++) {
1679 // Check for duplicates
1680 if (injected[n].may_be_java) {
1681 const Symbol* const name = injected[n].name();
1682 const Symbol* const signature = injected[n].signature();
1683 bool duplicate = false;
1684 for (int i = 0; i < length; i++) {
1685 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1686 if (name == cp->symbol_at(f->name_index()) &&
1687 signature == cp->symbol_at(f->signature_index())) {
1688 // Symbol is desclared in Java so skip this one
1689 duplicate = true;
1690 break;
1691 }
1692 }
1693 if (duplicate) {
1694 // These will be removed from the field array at the end
1695 continue;
1696 }
1697 }
1698
1699 // Injected field
1700 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1701 field->initialize(JVM_ACC_FIELD_INTERNAL,
1702 injected[n].name_index,
1703 injected[n].signature_index,
1704 0);
1705
1706 const BasicType type = FieldType::basic_type(injected[n].signature());
1707
1708 // Remember how many oops we encountered and compute allocation type
1709 const FieldAllocationType atype = fac->update(false, type);
1710 field->set_allocation_type(atype);
1711 index++;
1712 }
1713 }
1714
1715 assert(NULL == _fields, "invariant");
1716
1717 _fields =
1718 MetadataFactory::new_array<u2>(_loader_data,
1719 index * FieldInfo::field_slots + num_generic_signature,
1720 CHECK);
1721 // Sometimes injected fields already exist in the Java source so
1722 // the fields array could be too long. In that case the
1723 // fields array is trimed. Also unused slots that were reserved
1724 // for generic signature indexes are discarded.
1725 {
1726 int i = 0;
1727 for (; i < index * FieldInfo::field_slots; i++) {
1728 _fields->at_put(i, fa[i]);
1729 }
1730 for (int j = total_fields * FieldInfo::field_slots;
1731 j < generic_signature_slot; j++) {
1732 _fields->at_put(i++, fa[j]);
1733 }
1734 assert(_fields->length() == i, "");
1735 }
1736
1737 if (_need_verify && length > 1) {
1738 // Check duplicated fields
1739 ResourceMark rm(THREAD);
1740 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1741 THREAD, NameSigHash*, HASH_ROW_SIZE);
1742 initialize_hashtable(names_and_sigs);
1743 bool dup = false;
1744 const Symbol* name = NULL;
1745 const Symbol* sig = NULL;
1746 {
1747 debug_only(NoSafepointVerifier nsv;)
1748 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1749 name = fs.name();
1750 sig = fs.signature();
1751 // If no duplicates, add name/signature in hashtable names_and_sigs.
1752 if (!put_after_lookup(name, sig, names_and_sigs)) {
1753 dup = true;
1754 break;
1755 }
1756 }
1757 }
1758 if (dup) {
1759 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1760 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1761 }
1762 }
1763 }
1764
1765
1766 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1767 u4 code_length,
1768 u4 exception_table_length,
1769 TRAPS) {
1770 assert(cfs != NULL, "invariant");
1771
1772 const unsafe_u2* const exception_table_start = cfs->current();
1773 assert(exception_table_start != NULL, "null exception table");
1774
1775 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1776 // end_pc,
1777 // handler_pc,
1778 // catch_type_index
1779
1780 // Will check legal target after parsing code array in verifier.
1781 if (_need_verify) {
1782 for (unsigned int i = 0; i < exception_table_length; i++) {
1783 const u2 start_pc = cfs->get_u2_fast();
1784 const u2 end_pc = cfs->get_u2_fast();
1785 const u2 handler_pc = cfs->get_u2_fast();
1786 const u2 catch_type_index = cfs->get_u2_fast();
1787 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1788 "Illegal exception table range in class file %s",
1789 CHECK_NULL);
1790 guarantee_property(handler_pc < code_length,
1791 "Illegal exception table handler in class file %s",
1792 CHECK_NULL);
1793 if (catch_type_index != 0) {
1794 guarantee_property(valid_klass_reference_at(catch_type_index),
1795 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1796 }
1797 }
1798 } else {
1799 cfs->skip_u2_fast(exception_table_length * 4);
1800 }
1801 return exception_table_start;
1802 }
1803
1804 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1805 u4 code_length,
1806 CompressedLineNumberWriteStream**const write_stream,
1807 TRAPS) {
1808
1809 const ClassFileStream* const cfs = _stream;
1810 unsigned int num_entries = cfs->get_u2(CHECK);
1811
1812 // Each entry is a u2 start_pc, and a u2 line_number
1813 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1814
1815 // Verify line number attribute and table length
1816 check_property(
1817 code_attribute_length == sizeof(u2) + length_in_bytes,
1818 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1819
1820 cfs->guarantee_more(length_in_bytes, CHECK);
1821
1822 if ((*write_stream) == NULL) {
1823 if (length_in_bytes > fixed_buffer_size) {
1824 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1825 } else {
1826 (*write_stream) = new CompressedLineNumberWriteStream(
1827 _linenumbertable_buffer, fixed_buffer_size);
1828 }
1829 }
1830
1831 while (num_entries-- > 0) {
1832 const u2 bci = cfs->get_u2_fast(); // start_pc
1833 const u2 line = cfs->get_u2_fast(); // line_number
1834 guarantee_property(bci < code_length,
1835 "Invalid pc in LineNumberTable in class file %s", CHECK);
1836 (*write_stream)->write_pair(bci, line);
1837 }
1838 }
1839
1840
1841 class LVT_Hash : public AllStatic {
1842 public:
1843
1844 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1845 /*
1846 * 3-tuple start_bci/length/slot has to be unique key,
1847 * so the following comparison seems to be redundant:
1848 * && elem->name_cp_index == entry->_elem->name_cp_index
1849 */
1850 return (e0.start_bci == e1.start_bci &&
1851 e0.length == e1.length &&
1852 e0.name_cp_index == e1.name_cp_index &&
1853 e0.slot == e1.slot);
1854 }
1855
1856 static unsigned int hash(LocalVariableTableElement const& e0) {
1857 unsigned int raw_hash = e0.start_bci;
1858
1859 raw_hash = e0.length + raw_hash * 37;
1860 raw_hash = e0.name_cp_index + raw_hash * 37;
1861 raw_hash = e0.slot + raw_hash * 37;
1862
1863 return raw_hash;
1864 }
1865 };
1866
1867
1868 // Class file LocalVariableTable elements.
1869 class Classfile_LVT_Element {
1870 public:
1871 u2 start_bci;
1872 u2 length;
1873 u2 name_cp_index;
1874 u2 descriptor_cp_index;
1875 u2 slot;
1876 };
1877
1878 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1879 LocalVariableTableElement* const lvt) {
1880 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1881 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1882 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1883 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1884 lvt->signature_cp_index = 0;
1885 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1886 }
1887
1888 // Function is used to parse both attributes:
1889 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1890 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1891 u4 code_length,
1892 u2 max_locals,
1893 u4 code_attribute_length,
1894 u2* const localvariable_table_length,
1895 bool isLVTT,
1896 TRAPS) {
1897 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1898 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1899 const unsigned int size =
1900 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1901
1902 const ConstantPool* const cp = _cp;
1903
1904 // Verify local variable table attribute has right length
1905 if (_need_verify) {
1906 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1907 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1908 }
1909
1910 const unsafe_u2* const localvariable_table_start = cfs->current();
1911 assert(localvariable_table_start != NULL, "null local variable table");
1912 if (!_need_verify) {
1913 cfs->skip_u2_fast(size);
1914 } else {
1915 cfs->guarantee_more(size * 2, CHECK_NULL);
1916 for(int i = 0; i < (*localvariable_table_length); i++) {
1917 const u2 start_pc = cfs->get_u2_fast();
1918 const u2 length = cfs->get_u2_fast();
1919 const u2 name_index = cfs->get_u2_fast();
1920 const u2 descriptor_index = cfs->get_u2_fast();
1921 const u2 index = cfs->get_u2_fast();
1922 // Assign to a u4 to avoid overflow
1923 const u4 end_pc = (u4)start_pc + (u4)length;
1924
1925 if (start_pc >= code_length) {
1926 classfile_parse_error(
1927 "Invalid start_pc %u in %s in class file %s",
1928 start_pc, tbl_name, CHECK_NULL);
1929 }
1930 if (end_pc > code_length) {
1931 classfile_parse_error(
1932 "Invalid length %u in %s in class file %s",
1933 length, tbl_name, CHECK_NULL);
1934 }
1935 const int cp_size = cp->length();
1936 guarantee_property(valid_symbol_at(name_index),
1937 "Name index %u in %s has bad constant type in class file %s",
1938 name_index, tbl_name, CHECK_NULL);
1939 guarantee_property(valid_symbol_at(descriptor_index),
1940 "Signature index %u in %s has bad constant type in class file %s",
1941 descriptor_index, tbl_name, CHECK_NULL);
1942
1943 const Symbol* const name = cp->symbol_at(name_index);
1944 const Symbol* const sig = cp->symbol_at(descriptor_index);
1945 verify_legal_field_name(name, CHECK_NULL);
1946 u2 extra_slot = 0;
1947 if (!isLVTT) {
1948 verify_legal_field_signature(name, sig, CHECK_NULL);
1949
1950 // 4894874: check special cases for double and long local variables
1951 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1952 sig == vmSymbols::type_signature(T_LONG)) {
1953 extra_slot = 1;
1954 }
1955 }
1956 guarantee_property((index + extra_slot) < max_locals,
1957 "Invalid index %u in %s in class file %s",
1958 index, tbl_name, CHECK_NULL);
1959 }
1960 }
1961 return localvariable_table_start;
1962 }
1963
1964
1965 void ClassFileParser::parse_type_array(u2 array_length,
1966 u4 code_length,
1967 u4* const u1_index,
1968 u4* const u2_index,
1969 u1* const u1_array,
1970 u2* const u2_array,
1971 TRAPS) {
1972 const ClassFileStream* const cfs = _stream;
1973 u2 index = 0; // index in the array with long/double occupying two slots
1974 u4 i1 = *u1_index;
1975 u4 i2 = *u2_index + 1;
1976 for(int i = 0; i < array_length; i++) {
1977 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1978 index++;
1979 if (tag == ITEM_Long || tag == ITEM_Double) {
1980 index++;
1981 } else if (tag == ITEM_Object) {
1982 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1983 guarantee_property(valid_klass_reference_at(class_index),
1984 "Bad class index %u in StackMap in class file %s",
1985 class_index, CHECK);
1986 } else if (tag == ITEM_Uninitialized) {
1987 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1988 guarantee_property(
1989 offset < code_length,
1990 "Bad uninitialized type offset %u in StackMap in class file %s",
1991 offset, CHECK);
1992 } else {
1993 guarantee_property(
1994 tag <= (u1)ITEM_Uninitialized,
1995 "Unknown variable type %u in StackMap in class file %s",
1996 tag, CHECK);
1997 }
1998 }
1999 u2_array[*u2_index] = index;
2000 *u1_index = i1;
2001 *u2_index = i2;
2002 }
2003
2004 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2005 u4 code_attribute_length,
2006 bool need_verify,
2007 TRAPS) {
2008 assert(cfs != NULL, "invariant");
2009
2010 if (0 == code_attribute_length) {
2011 return NULL;
2012 }
2013
2014 const u1* const stackmap_table_start = cfs->current();
2015 assert(stackmap_table_start != NULL, "null stackmap table");
2016
2017 // check code_attribute_length first
2018 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2019
2020 if (!need_verify && !DumpSharedSpaces) {
2021 return NULL;
2022 }
2023 return stackmap_table_start;
2024 }
2025
2026 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2027 u2* const checked_exceptions_length,
2028 u4 method_attribute_length,
2029 TRAPS) {
2030 assert(cfs != NULL, "invariant");
2031 assert(checked_exceptions_length != NULL, "invariant");
2032
2033 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2034 *checked_exceptions_length = cfs->get_u2_fast();
2035 const unsigned int size =
2036 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2037 const unsafe_u2* const checked_exceptions_start = cfs->current();
2038 assert(checked_exceptions_start != NULL, "null checked exceptions");
2039 if (!_need_verify) {
2040 cfs->skip_u2_fast(size);
2041 } else {
2042 // Verify each value in the checked exception table
2043 u2 checked_exception;
2044 const u2 len = *checked_exceptions_length;
2045 cfs->guarantee_more(2 * len, CHECK_NULL);
2046 for (int i = 0; i < len; i++) {
2047 checked_exception = cfs->get_u2_fast();
2048 check_property(
2049 valid_klass_reference_at(checked_exception),
2050 "Exception name has bad type at constant pool %u in class file %s",
2051 checked_exception, CHECK_NULL);
2052 }
2053 }
2054 // check exceptions attribute length
2055 if (_need_verify) {
2056 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2057 sizeof(u2) * size),
2058 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2059 }
2060 return checked_exceptions_start;
2061 }
2062
2063 void ClassFileParser::throwIllegalSignature(const char* type,
2064 const Symbol* name,
2065 const Symbol* sig,
2066 TRAPS) const {
2067 assert(name != NULL, "invariant");
2068 assert(sig != NULL, "invariant");
2069
2070 ResourceMark rm(THREAD);
2071 Exceptions::fthrow(THREAD_AND_LOCATION,
2072 vmSymbols::java_lang_ClassFormatError(),
2073 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2074 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2075 }
2076
2077 AnnotationCollector::ID
2078 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2079 const Symbol* name) {
2080 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2081 // Privileged code can use all annotations. Other code silently drops some.
2082 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2083 loader_data->is_platform_class_loader_data() ||
2084 loader_data->is_anonymous();
2085 switch (sid) {
2086 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2087 if (_location != _in_method) break; // only allow for methods
2088 if (!privileged) break; // only allow in privileged code
2089 return _method_CallerSensitive;
2090 }
2091 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2092 if (_location != _in_method) break; // only allow for methods
2093 if (!privileged) break; // only allow in privileged code
2094 return _method_ForceInline;
2095 }
2096 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2097 if (_location != _in_method) break; // only allow for methods
2098 if (!privileged) break; // only allow in privileged code
2099 return _method_DontInline;
2100 }
2101 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2102 if (_location != _in_method) break; // only allow for methods
2103 if (!privileged) break; // only allow in privileged code
2104 return _method_InjectedProfile;
2105 }
2106 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2107 if (_location != _in_method) break; // only allow for methods
2108 if (!privileged) break; // only allow in privileged code
2109 return _method_LambdaForm_Compiled;
2110 }
2111 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2112 if (_location != _in_method) break; // only allow for methods
2113 if (!privileged) break; // only allow in privileged code
2114 return _method_LambdaForm_Hidden;
2115 }
2116 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2117 if (_location != _in_method) break; // only allow for methods
2118 if (!privileged) break; // only allow in privileged code
2119 return _method_HotSpotIntrinsicCandidate;
2120 }
2121 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2122 if (_location != _in_field) break; // only allow for fields
2123 if (!privileged) break; // only allow in privileged code
2124 return _field_Stable;
2125 }
2126 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2127 if (_location != _in_field && _location != _in_class) {
2128 break; // only allow for fields and classes
2129 }
2130 if (!EnableContended || (RestrictContended && !privileged)) {
2131 break; // honor privileges
2132 }
2133 return _jdk_internal_vm_annotation_Contended;
2134 }
2135 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2136 if (_location != _in_method) break; // only allow for methods
2137 if (RestrictReservedStack && !privileged) break; // honor privileges
2138 return _jdk_internal_vm_annotation_ReservedStackAccess;
2139 }
2140 default: {
2141 break;
2142 }
2143 }
2144 return AnnotationCollector::_unknown;
2145 }
2146
2147 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2148 if (is_contended())
2149 f->set_contended_group(contended_group());
2150 if (is_stable())
2151 f->set_stable(true);
2152 }
2153
2154 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2155 // If there's an error deallocate metadata for field annotations
2156 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2157 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2158 }
2159
2160 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2161 if (has_annotation(_method_CallerSensitive))
2162 m->set_caller_sensitive(true);
2163 if (has_annotation(_method_ForceInline))
2164 m->set_force_inline(true);
2165 if (has_annotation(_method_DontInline))
2166 m->set_dont_inline(true);
2167 if (has_annotation(_method_InjectedProfile))
2168 m->set_has_injected_profile(true);
2169 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2170 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2171 if (has_annotation(_method_LambdaForm_Hidden))
2172 m->set_hidden(true);
2173 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2174 m->set_intrinsic_candidate(true);
2175 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2176 m->set_has_reserved_stack_access(true);
2177 }
2178
2179 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2180 assert(ik != NULL, "invariant");
2181 ik->set_is_contended(is_contended());
2182 }
2183
2184 #define MAX_ARGS_SIZE 255
2185 #define MAX_CODE_SIZE 65535
2186 #define INITIAL_MAX_LVT_NUMBER 256
2187
2188 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2189 *
2190 * Rules for LVT's and LVTT's are:
2191 * - There can be any number of LVT's and LVTT's.
2192 * - If there are n LVT's, it is the same as if there was just
2193 * one LVT containing all the entries from the n LVT's.
2194 * - There may be no more than one LVT entry per local variable.
2195 * Two LVT entries are 'equal' if these fields are the same:
2196 * start_pc, length, name, slot
2197 * - There may be no more than one LVTT entry per each LVT entry.
2198 * Each LVTT entry has to match some LVT entry.
2199 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2200 */
2201 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2202 int lvt_cnt,
2203 u2* const localvariable_table_length,
2204 const unsafe_u2** const localvariable_table_start,
2205 int lvtt_cnt,
2206 u2* const localvariable_type_table_length,
2207 const unsafe_u2** const localvariable_type_table_start,
2208 TRAPS) {
2209
2210 ResourceMark rm(THREAD);
2211
2212 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2213 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2214
2215 LVT_HashTable* const table = new LVT_HashTable();
2216
2217 // To fill LocalVariableTable in
2218 const Classfile_LVT_Element* cf_lvt;
2219 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2220
2221 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2222 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2223 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2224 copy_lvt_element(&cf_lvt[idx], lvt);
2225 // If no duplicates, add LVT elem in hashtable.
2226 if (table->put(*lvt, lvt) == false
2227 && _need_verify
2228 && _major_version >= JAVA_1_5_VERSION) {
2229 classfile_parse_error("Duplicated LocalVariableTable attribute "
2230 "entry for '%s' in class file %s",
2231 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2232 CHECK);
2233 }
2234 }
2235 }
2236
2237 // To merge LocalVariableTable and LocalVariableTypeTable
2238 const Classfile_LVT_Element* cf_lvtt;
2239 LocalVariableTableElement lvtt_elem;
2240
2241 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2242 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2243 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2244 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2245 LocalVariableTableElement** entry = table->get(lvtt_elem);
2246 if (entry == NULL) {
2247 if (_need_verify) {
2248 classfile_parse_error("LVTT entry for '%s' in class file %s "
2249 "does not match any LVT entry",
2250 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2251 CHECK);
2252 }
2253 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2254 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2255 "entry for '%s' in class file %s",
2256 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2257 CHECK);
2258 } else {
2259 // to add generic signatures into LocalVariableTable
2260 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2261 }
2262 }
2263 }
2264 }
2265
2266
2267 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2268 const u1* runtime_visible_annotations,
2269 int runtime_visible_annotations_length,
2270 const u1* runtime_invisible_annotations,
2271 int runtime_invisible_annotations_length,
2272 const u1* runtime_visible_parameter_annotations,
2273 int runtime_visible_parameter_annotations_length,
2274 const u1* runtime_invisible_parameter_annotations,
2275 int runtime_invisible_parameter_annotations_length,
2276 const u1* runtime_visible_type_annotations,
2277 int runtime_visible_type_annotations_length,
2278 const u1* runtime_invisible_type_annotations,
2279 int runtime_invisible_type_annotations_length,
2280 const u1* annotation_default,
2281 int annotation_default_length,
2282 TRAPS) {
2283
2284 AnnotationArray* a;
2285
2286 if (runtime_visible_annotations_length +
2287 runtime_invisible_annotations_length > 0) {
2288 a = assemble_annotations(runtime_visible_annotations,
2289 runtime_visible_annotations_length,
2290 runtime_invisible_annotations,
2291 runtime_invisible_annotations_length,
2292 CHECK);
2293 cm->set_method_annotations(a);
2294 }
2295
2296 if (runtime_visible_parameter_annotations_length +
2297 runtime_invisible_parameter_annotations_length > 0) {
2298 a = assemble_annotations(runtime_visible_parameter_annotations,
2299 runtime_visible_parameter_annotations_length,
2300 runtime_invisible_parameter_annotations,
2301 runtime_invisible_parameter_annotations_length,
2302 CHECK);
2303 cm->set_parameter_annotations(a);
2304 }
2305
2306 if (annotation_default_length > 0) {
2307 a = assemble_annotations(annotation_default,
2308 annotation_default_length,
2309 NULL,
2310 0,
2311 CHECK);
2312 cm->set_default_annotations(a);
2313 }
2314
2315 if (runtime_visible_type_annotations_length +
2316 runtime_invisible_type_annotations_length > 0) {
2317 a = assemble_annotations(runtime_visible_type_annotations,
2318 runtime_visible_type_annotations_length,
2319 runtime_invisible_type_annotations,
2320 runtime_invisible_type_annotations_length,
2321 CHECK);
2322 cm->set_type_annotations(a);
2323 }
2324 }
2325
2326
2327 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2328 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2329 // Method* to save footprint, so we only know the size of the resulting Method* when the
2330 // entire method attribute is parsed.
2331 //
2332 // The promoted_flags parameter is used to pass relevant access_flags
2333 // from the method back up to the containing klass. These flag values
2334 // are added to klass's access_flags.
2335
2336 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2337 bool is_interface,
2338 const ConstantPool* cp,
2339 AccessFlags* const promoted_flags,
2340 TRAPS) {
2341 assert(cfs != NULL, "invariant");
2342 assert(cp != NULL, "invariant");
2343 assert(promoted_flags != NULL, "invariant");
2344
2345 ResourceMark rm(THREAD);
2346 // Parse fixed parts:
2347 // access_flags, name_index, descriptor_index, attributes_count
2348 cfs->guarantee_more(8, CHECK_NULL);
2349
2350 int flags = cfs->get_u2_fast();
2351 const u2 name_index = cfs->get_u2_fast();
2352 const int cp_size = cp->length();
2353 check_property(
2354 valid_symbol_at(name_index),
2355 "Illegal constant pool index %u for method name in class file %s",
2356 name_index, CHECK_NULL);
2357 const Symbol* const name = cp->symbol_at(name_index);
2358 verify_legal_method_name(name, CHECK_NULL);
2359
2360 const u2 signature_index = cfs->get_u2_fast();
2361 guarantee_property(
2362 valid_symbol_at(signature_index),
2363 "Illegal constant pool index %u for method signature in class file %s",
2364 signature_index, CHECK_NULL);
2365 const Symbol* const signature = cp->symbol_at(signature_index);
2366
2367 if (name == vmSymbols::class_initializer_name()) {
2368 // We ignore the other access flags for a valid class initializer.
2369 // (JVM Spec 2nd ed., chapter 4.6)
2370 if (_major_version < 51) { // backward compatibility
2371 flags = JVM_ACC_STATIC;
2372 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2373 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2374 } else {
2375 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2376 }
2377 } else {
2378 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2379 }
2380
2381 if (name == vmSymbols::object_initializer_name() && is_interface) {
2382 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2383 }
2384
2385 int args_size = -1; // only used when _need_verify is true
2386 if (_need_verify) {
2387 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2388 verify_legal_method_signature(name, signature, CHECK_NULL);
2389 if (args_size > MAX_ARGS_SIZE) {
2390 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2391 }
2392 }
2393
2394 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2395
2396 // Default values for code and exceptions attribute elements
2397 u2 max_stack = 0;
2398 u2 max_locals = 0;
2399 u4 code_length = 0;
2400 const u1* code_start = 0;
2401 u2 exception_table_length = 0;
2402 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2403 Array<int>* exception_handlers = Universe::the_empty_int_array();
2404 u2 checked_exceptions_length = 0;
2405 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2406 CompressedLineNumberWriteStream* linenumber_table = NULL;
2407 int linenumber_table_length = 0;
2408 int total_lvt_length = 0;
2409 u2 lvt_cnt = 0;
2410 u2 lvtt_cnt = 0;
2411 bool lvt_allocated = false;
2412 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2413 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2414 u2* localvariable_table_length = NULL;
2415 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2416 u2* localvariable_type_table_length = NULL;
2417 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2418 int method_parameters_length = -1;
2419 const u1* method_parameters_data = NULL;
2420 bool method_parameters_seen = false;
2421 bool parsed_code_attribute = false;
2422 bool parsed_checked_exceptions_attribute = false;
2423 bool parsed_stackmap_attribute = false;
2424 // stackmap attribute - JDK1.5
2425 const u1* stackmap_data = NULL;
2426 int stackmap_data_length = 0;
2427 u2 generic_signature_index = 0;
2428 MethodAnnotationCollector parsed_annotations;
2429 const u1* runtime_visible_annotations = NULL;
2430 int runtime_visible_annotations_length = 0;
2431 const u1* runtime_invisible_annotations = NULL;
2432 int runtime_invisible_annotations_length = 0;
2433 const u1* runtime_visible_parameter_annotations = NULL;
2434 int runtime_visible_parameter_annotations_length = 0;
2435 const u1* runtime_invisible_parameter_annotations = NULL;
2436 int runtime_invisible_parameter_annotations_length = 0;
2437 const u1* runtime_visible_type_annotations = NULL;
2438 int runtime_visible_type_annotations_length = 0;
2439 const u1* runtime_invisible_type_annotations = NULL;
2440 int runtime_invisible_type_annotations_length = 0;
2441 bool runtime_invisible_annotations_exists = false;
2442 bool runtime_invisible_type_annotations_exists = false;
2443 bool runtime_invisible_parameter_annotations_exists = false;
2444 const u1* annotation_default = NULL;
2445 int annotation_default_length = 0;
2446
2447 // Parse code and exceptions attribute
2448 u2 method_attributes_count = cfs->get_u2_fast();
2449 while (method_attributes_count--) {
2450 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2451 const u2 method_attribute_name_index = cfs->get_u2_fast();
2452 const u4 method_attribute_length = cfs->get_u4_fast();
2453 check_property(
2454 valid_symbol_at(method_attribute_name_index),
2455 "Invalid method attribute name index %u in class file %s",
2456 method_attribute_name_index, CHECK_NULL);
2457
2458 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2459 if (method_attribute_name == vmSymbols::tag_code()) {
2460 // Parse Code attribute
2461 if (_need_verify) {
2462 guarantee_property(
2463 !access_flags.is_native() && !access_flags.is_abstract(),
2464 "Code attribute in native or abstract methods in class file %s",
2465 CHECK_NULL);
2466 }
2467 if (parsed_code_attribute) {
2468 classfile_parse_error("Multiple Code attributes in class file %s",
2469 CHECK_NULL);
2470 }
2471 parsed_code_attribute = true;
2472
2473 // Stack size, locals size, and code size
2474 if (_major_version == 45 && _minor_version <= 2) {
2475 cfs->guarantee_more(4, CHECK_NULL);
2476 max_stack = cfs->get_u1_fast();
2477 max_locals = cfs->get_u1_fast();
2478 code_length = cfs->get_u2_fast();
2479 } else {
2480 cfs->guarantee_more(8, CHECK_NULL);
2481 max_stack = cfs->get_u2_fast();
2482 max_locals = cfs->get_u2_fast();
2483 code_length = cfs->get_u4_fast();
2484 }
2485 if (_need_verify) {
2486 guarantee_property(args_size <= max_locals,
2487 "Arguments can't fit into locals in class file %s",
2488 CHECK_NULL);
2489 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2490 "Invalid method Code length %u in class file %s",
2491 code_length, CHECK_NULL);
2492 }
2493 // Code pointer
2494 code_start = cfs->current();
2495 assert(code_start != NULL, "null code start");
2496 cfs->guarantee_more(code_length, CHECK_NULL);
2497 cfs->skip_u1_fast(code_length);
2498
2499 // Exception handler table
2500 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2501 exception_table_length = cfs->get_u2_fast();
2502 if (exception_table_length > 0) {
2503 exception_table_start = parse_exception_table(cfs,
2504 code_length,
2505 exception_table_length,
2506 CHECK_NULL);
2507 }
2508
2509 // Parse additional attributes in code attribute
2510 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2511 u2 code_attributes_count = cfs->get_u2_fast();
2512
2513 unsigned int calculated_attribute_length = 0;
2514
2515 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2516 calculated_attribute_length =
2517 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2518 } else {
2519 // max_stack, locals and length are smaller in pre-version 45.2 classes
2520 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2521 }
2522 calculated_attribute_length +=
2523 code_length +
2524 sizeof(exception_table_length) +
2525 sizeof(code_attributes_count) +
2526 exception_table_length *
2527 ( sizeof(u2) + // start_pc
2528 sizeof(u2) + // end_pc
2529 sizeof(u2) + // handler_pc
2530 sizeof(u2) ); // catch_type_index
2531
2532 while (code_attributes_count--) {
2533 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2534 const u2 code_attribute_name_index = cfs->get_u2_fast();
2535 const u4 code_attribute_length = cfs->get_u4_fast();
2536 calculated_attribute_length += code_attribute_length +
2537 sizeof(code_attribute_name_index) +
2538 sizeof(code_attribute_length);
2539 check_property(valid_symbol_at(code_attribute_name_index),
2540 "Invalid code attribute name index %u in class file %s",
2541 code_attribute_name_index,
2542 CHECK_NULL);
2543 if (LoadLineNumberTables &&
2544 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2545 // Parse and compress line number table
2546 parse_linenumber_table(code_attribute_length,
2547 code_length,
2548 &linenumber_table,
2549 CHECK_NULL);
2550
2551 } else if (LoadLocalVariableTables &&
2552 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2553 // Parse local variable table
2554 if (!lvt_allocated) {
2555 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2556 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2557 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2558 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2559 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2560 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2561 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2562 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2563 lvt_allocated = true;
2564 }
2565 if (lvt_cnt == max_lvt_cnt) {
2566 max_lvt_cnt <<= 1;
2567 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2568 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2569 }
2570 localvariable_table_start[lvt_cnt] =
2571 parse_localvariable_table(cfs,
2572 code_length,
2573 max_locals,
2574 code_attribute_length,
2575 &localvariable_table_length[lvt_cnt],
2576 false, // is not LVTT
2577 CHECK_NULL);
2578 total_lvt_length += localvariable_table_length[lvt_cnt];
2579 lvt_cnt++;
2580 } else if (LoadLocalVariableTypeTables &&
2581 _major_version >= JAVA_1_5_VERSION &&
2582 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2583 if (!lvt_allocated) {
2584 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2585 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2586 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2587 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2588 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2589 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2590 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2591 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2592 lvt_allocated = true;
2593 }
2594 // Parse local variable type table
2595 if (lvtt_cnt == max_lvtt_cnt) {
2596 max_lvtt_cnt <<= 1;
2597 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2598 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2599 }
2600 localvariable_type_table_start[lvtt_cnt] =
2601 parse_localvariable_table(cfs,
2602 code_length,
2603 max_locals,
2604 code_attribute_length,
2605 &localvariable_type_table_length[lvtt_cnt],
2606 true, // is LVTT
2607 CHECK_NULL);
2608 lvtt_cnt++;
2609 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2610 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2611 // Stack map is only needed by the new verifier in JDK1.5.
2612 if (parsed_stackmap_attribute) {
2613 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2614 }
2615 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2616 stackmap_data_length = code_attribute_length;
2617 parsed_stackmap_attribute = true;
2618 } else {
2619 // Skip unknown attributes
2620 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2621 }
2622 }
2623 // check method attribute length
2624 if (_need_verify) {
2625 guarantee_property(method_attribute_length == calculated_attribute_length,
2626 "Code segment has wrong length in class file %s",
2627 CHECK_NULL);
2628 }
2629 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2630 // Parse Exceptions attribute
2631 if (parsed_checked_exceptions_attribute) {
2632 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2633 CHECK_NULL);
2634 }
2635 parsed_checked_exceptions_attribute = true;
2636 checked_exceptions_start =
2637 parse_checked_exceptions(cfs,
2638 &checked_exceptions_length,
2639 method_attribute_length,
2640 CHECK_NULL);
2641 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2642 // reject multiple method parameters
2643 if (method_parameters_seen) {
2644 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2645 CHECK_NULL);
2646 }
2647 method_parameters_seen = true;
2648 method_parameters_length = cfs->get_u1_fast();
2649 const u2 real_length = (method_parameters_length * 4u) + 1u;
2650 if (method_attribute_length != real_length) {
2651 classfile_parse_error(
2652 "Invalid MethodParameters method attribute length %u in class file",
2653 method_attribute_length, CHECK_NULL);
2654 }
2655 method_parameters_data = cfs->current();
2656 cfs->skip_u2_fast(method_parameters_length);
2657 cfs->skip_u2_fast(method_parameters_length);
2658 // ignore this attribute if it cannot be reflected
2659 if (!SystemDictionary::Parameter_klass_loaded())
2660 method_parameters_length = -1;
2661 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2662 if (method_attribute_length != 0) {
2663 classfile_parse_error(
2664 "Invalid Synthetic method attribute length %u in class file %s",
2665 method_attribute_length, CHECK_NULL);
2666 }
2667 // Should we check that there hasn't already been a synthetic attribute?
2668 access_flags.set_is_synthetic();
2669 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2670 if (method_attribute_length != 0) {
2671 classfile_parse_error(
2672 "Invalid Deprecated method attribute length %u in class file %s",
2673 method_attribute_length, CHECK_NULL);
2674 }
2675 } else if (_major_version >= JAVA_1_5_VERSION) {
2676 if (method_attribute_name == vmSymbols::tag_signature()) {
2677 if (generic_signature_index != 0) {
2678 classfile_parse_error(
2679 "Multiple Signature attributes for method in class file %s",
2680 CHECK_NULL);
2681 }
2682 if (method_attribute_length != 2) {
2683 classfile_parse_error(
2684 "Invalid Signature attribute length %u in class file %s",
2685 method_attribute_length, CHECK_NULL);
2686 }
2687 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2688 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2689 if (runtime_visible_annotations != NULL) {
2690 classfile_parse_error(
2691 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2692 CHECK_NULL);
2693 }
2694 runtime_visible_annotations_length = method_attribute_length;
2695 runtime_visible_annotations = cfs->current();
2696 assert(runtime_visible_annotations != NULL, "null visible annotations");
2697 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2698 parse_annotations(cp,
2699 runtime_visible_annotations,
2700 runtime_visible_annotations_length,
2701 &parsed_annotations,
2702 _loader_data,
2703 CHECK_NULL);
2704 cfs->skip_u1_fast(runtime_visible_annotations_length);
2705 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2706 if (runtime_invisible_annotations_exists) {
2707 classfile_parse_error(
2708 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2709 CHECK_NULL);
2710 }
2711 runtime_invisible_annotations_exists = true;
2712 if (PreserveAllAnnotations) {
2713 runtime_invisible_annotations_length = method_attribute_length;
2714 runtime_invisible_annotations = cfs->current();
2715 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2716 }
2717 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2718 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2719 if (runtime_visible_parameter_annotations != NULL) {
2720 classfile_parse_error(
2721 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2722 CHECK_NULL);
2723 }
2724 runtime_visible_parameter_annotations_length = method_attribute_length;
2725 runtime_visible_parameter_annotations = cfs->current();
2726 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2727 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2728 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2729 if (runtime_invisible_parameter_annotations_exists) {
2730 classfile_parse_error(
2731 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2732 CHECK_NULL);
2733 }
2734 runtime_invisible_parameter_annotations_exists = true;
2735 if (PreserveAllAnnotations) {
2736 runtime_invisible_parameter_annotations_length = method_attribute_length;
2737 runtime_invisible_parameter_annotations = cfs->current();
2738 assert(runtime_invisible_parameter_annotations != NULL,
2739 "null invisible parameter annotations");
2740 }
2741 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2742 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2743 if (annotation_default != NULL) {
2744 classfile_parse_error(
2745 "Multiple AnnotationDefault attributes for method in class file %s",
2746 CHECK_NULL);
2747 }
2748 annotation_default_length = method_attribute_length;
2749 annotation_default = cfs->current();
2750 assert(annotation_default != NULL, "null annotation default");
2751 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2752 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2753 if (runtime_visible_type_annotations != NULL) {
2754 classfile_parse_error(
2755 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2756 CHECK_NULL);
2757 }
2758 runtime_visible_type_annotations_length = method_attribute_length;
2759 runtime_visible_type_annotations = cfs->current();
2760 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2761 // No need for the VM to parse Type annotations
2762 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2763 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2764 if (runtime_invisible_type_annotations_exists) {
2765 classfile_parse_error(
2766 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2767 CHECK_NULL);
2768 } else {
2769 runtime_invisible_type_annotations_exists = true;
2770 }
2771 if (PreserveAllAnnotations) {
2772 runtime_invisible_type_annotations_length = method_attribute_length;
2773 runtime_invisible_type_annotations = cfs->current();
2774 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2775 }
2776 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2777 } else {
2778 // Skip unknown attributes
2779 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2780 }
2781 } else {
2782 // Skip unknown attributes
2783 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2784 }
2785 }
2786
2787 if (linenumber_table != NULL) {
2788 linenumber_table->write_terminator();
2789 linenumber_table_length = linenumber_table->position();
2790 }
2791
2792 // Make sure there's at least one Code attribute in non-native/non-abstract method
2793 if (_need_verify) {
2794 guarantee_property(access_flags.is_native() ||
2795 access_flags.is_abstract() ||
2796 parsed_code_attribute,
2797 "Absent Code attribute in method that is not native or abstract in class file %s",
2798 CHECK_NULL);
2799 }
2800
2801 // All sizing information for a Method* is finally available, now create it
2802 InlineTableSizes sizes(
2803 total_lvt_length,
2804 linenumber_table_length,
2805 exception_table_length,
2806 checked_exceptions_length,
2807 method_parameters_length,
2808 generic_signature_index,
2809 runtime_visible_annotations_length +
2810 runtime_invisible_annotations_length,
2811 runtime_visible_parameter_annotations_length +
2812 runtime_invisible_parameter_annotations_length,
2813 runtime_visible_type_annotations_length +
2814 runtime_invisible_type_annotations_length,
2815 annotation_default_length,
2816 0);
2817
2818 Method* const m = Method::allocate(_loader_data,
2819 code_length,
2820 access_flags,
2821 &sizes,
2822 ConstMethod::NORMAL,
2823 CHECK_NULL);
2824
2825 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2826
2827 // Fill in information from fixed part (access_flags already set)
2828 m->set_constants(_cp);
2829 m->set_name_index(name_index);
2830 m->set_signature_index(signature_index);
2831
2832 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2833 m->constMethod()->set_result_type(rtf.type());
2834
2835 if (args_size >= 0) {
2836 m->set_size_of_parameters(args_size);
2837 } else {
2838 m->compute_size_of_parameters(THREAD);
2839 }
2840 #ifdef ASSERT
2841 if (args_size >= 0) {
2842 m->compute_size_of_parameters(THREAD);
2843 assert(args_size == m->size_of_parameters(), "");
2844 }
2845 #endif
2846
2847 // Fill in code attribute information
2848 m->set_max_stack(max_stack);
2849 m->set_max_locals(max_locals);
2850 if (stackmap_data != NULL) {
2851 m->constMethod()->copy_stackmap_data(_loader_data,
2852 (u1*)stackmap_data,
2853 stackmap_data_length,
2854 CHECK_NULL);
2855 }
2856
2857 // Copy byte codes
2858 m->set_code((u1*)code_start);
2859
2860 // Copy line number table
2861 if (linenumber_table != NULL) {
2862 memcpy(m->compressed_linenumber_table(),
2863 linenumber_table->buffer(),
2864 linenumber_table_length);
2865 }
2866
2867 // Copy exception table
2868 if (exception_table_length > 0) {
2869 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2870 m->exception_table_start(),
2871 exception_table_length * sizeof(ExceptionTableElement),
2872 sizeof(u2));
2873 }
2874
2875 // Copy method parameters
2876 if (method_parameters_length > 0) {
2877 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2878 for (int i = 0; i < method_parameters_length; i++) {
2879 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2880 method_parameters_data += 2;
2881 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2882 method_parameters_data += 2;
2883 }
2884 }
2885
2886 // Copy checked exceptions
2887 if (checked_exceptions_length > 0) {
2888 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2889 m->checked_exceptions_start(),
2890 checked_exceptions_length * sizeof(CheckedExceptionElement),
2891 sizeof(u2));
2892 }
2893
2894 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2895 if (total_lvt_length > 0) {
2896 promoted_flags->set_has_localvariable_table();
2897 copy_localvariable_table(m->constMethod(),
2898 lvt_cnt,
2899 localvariable_table_length,
2900 localvariable_table_start,
2901 lvtt_cnt,
2902 localvariable_type_table_length,
2903 localvariable_type_table_start,
2904 CHECK_NULL);
2905 }
2906
2907 if (parsed_annotations.has_any_annotations())
2908 parsed_annotations.apply_to(m);
2909
2910 // Copy annotations
2911 copy_method_annotations(m->constMethod(),
2912 runtime_visible_annotations,
2913 runtime_visible_annotations_length,
2914 runtime_invisible_annotations,
2915 runtime_invisible_annotations_length,
2916 runtime_visible_parameter_annotations,
2917 runtime_visible_parameter_annotations_length,
2918 runtime_invisible_parameter_annotations,
2919 runtime_invisible_parameter_annotations_length,
2920 runtime_visible_type_annotations,
2921 runtime_visible_type_annotations_length,
2922 runtime_invisible_type_annotations,
2923 runtime_invisible_type_annotations_length,
2924 annotation_default,
2925 annotation_default_length,
2926 CHECK_NULL);
2927
2928 if (name == vmSymbols::finalize_method_name() &&
2929 signature == vmSymbols::void_method_signature()) {
2930 if (m->is_empty_method()) {
2931 _has_empty_finalizer = true;
2932 } else {
2933 _has_finalizer = true;
2934 }
2935 }
2936 if (name == vmSymbols::object_initializer_name() &&
2937 signature == vmSymbols::void_method_signature() &&
2938 m->is_vanilla_constructor()) {
2939 _has_vanilla_constructor = true;
2940 }
2941
2942 NOT_PRODUCT(m->verify());
2943 return m;
2944 }
2945
2946
2947 // The promoted_flags parameter is used to pass relevant access_flags
2948 // from the methods back up to the containing klass. These flag values
2949 // are added to klass's access_flags.
2950 // Side-effects: populates the _methods field in the parser
2951 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2952 bool is_interface,
2953 AccessFlags* promoted_flags,
2954 bool* has_final_method,
2955 bool* declares_nonstatic_concrete_methods,
2956 TRAPS) {
2957 assert(cfs != NULL, "invariant");
2958 assert(promoted_flags != NULL, "invariant");
2959 assert(has_final_method != NULL, "invariant");
2960 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2961
2962 assert(NULL == _methods, "invariant");
2963
2964 cfs->guarantee_more(2, CHECK); // length
2965 const u2 length = cfs->get_u2_fast();
2966 if (length == 0) {
2967 _methods = Universe::the_empty_method_array();
2968 } else {
2969 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2970 length,
2971 NULL,
2972 CHECK);
2973
2974 for (int index = 0; index < length; index++) {
2975 Method* method = parse_method(cfs,
2976 is_interface,
2977 _cp,
2978 promoted_flags,
2979 CHECK);
2980
2981 if (method->is_final()) {
2982 *has_final_method = true;
2983 }
2984 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2985 // used for interface initialization, and default method inheritance analysis
2986 if (is_interface && !(*declares_nonstatic_concrete_methods)
2987 && !method->is_abstract() && !method->is_static()) {
2988 *declares_nonstatic_concrete_methods = true;
2989 }
2990 _methods->at_put(index, method);
2991 }
2992
2993 if (_need_verify && length > 1) {
2994 // Check duplicated methods
2995 ResourceMark rm(THREAD);
2996 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2997 THREAD, NameSigHash*, HASH_ROW_SIZE);
2998 initialize_hashtable(names_and_sigs);
2999 bool dup = false;
3000 const Symbol* name = NULL;
3001 const Symbol* sig = NULL;
3002 {
3003 debug_only(NoSafepointVerifier nsv;)
3004 for (int i = 0; i < length; i++) {
3005 const Method* const m = _methods->at(i);
3006 name = m->name();
3007 sig = m->signature();
3008 // If no duplicates, add name/signature in hashtable names_and_sigs.
3009 if (!put_after_lookup(name, sig, names_and_sigs)) {
3010 dup = true;
3011 break;
3012 }
3013 }
3014 }
3015 if (dup) {
3016 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3017 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3018 }
3019 }
3020 }
3021 }
3022
3023 static const intArray* sort_methods(Array<Method*>* methods) {
3024 const int length = methods->length();
3025 // If JVMTI original method ordering or sharing is enabled we have to
3026 // remember the original class file ordering.
3027 // We temporarily use the vtable_index field in the Method* to store the
3028 // class file index, so we can read in after calling qsort.
3029 // Put the method ordering in the shared archive.
3030 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3031 for (int index = 0; index < length; index++) {
3032 Method* const m = methods->at(index);
3033 assert(!m->valid_vtable_index(), "vtable index should not be set");
3034 m->set_vtable_index(index);
3035 }
3036 }
3037 // Sort method array by ascending method name (for faster lookups & vtable construction)
3038 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3039 Method::sort_methods(methods);
3040
3041 intArray* method_ordering = NULL;
3042 // If JVMTI original method ordering or sharing is enabled construct int
3043 // array remembering the original ordering
3044 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3045 method_ordering = new intArray(length, length, -1);
3046 for (int index = 0; index < length; index++) {
3047 Method* const m = methods->at(index);
3048 const int old_index = m->vtable_index();
3049 assert(old_index >= 0 && old_index < length, "invalid method index");
3050 method_ordering->at_put(index, old_index);
3051 m->set_vtable_index(Method::invalid_vtable_index);
3052 }
3053 }
3054 return method_ordering;
3055 }
3056
3057 // Parse generic_signature attribute for methods and fields
3058 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3059 TRAPS) {
3060 assert(cfs != NULL, "invariant");
3061
3062 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3063 const u2 generic_signature_index = cfs->get_u2_fast();
3064 check_property(
3065 valid_symbol_at(generic_signature_index),
3066 "Invalid Signature attribute at constant pool index %u in class file %s",
3067 generic_signature_index, CHECK_0);
3068 return generic_signature_index;
3069 }
3070
3071 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3072 TRAPS) {
3073
3074 assert(cfs != NULL, "invariant");
3075
3076 cfs->guarantee_more(2, CHECK); // sourcefile_index
3077 const u2 sourcefile_index = cfs->get_u2_fast();
3078 check_property(
3079 valid_symbol_at(sourcefile_index),
3080 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3081 sourcefile_index, CHECK);
3082 set_class_sourcefile_index(sourcefile_index);
3083 }
3084
3085 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3086 int length,
3087 TRAPS) {
3088 assert(cfs != NULL, "invariant");
3089
3090 const u1* const sde_buffer = cfs->current();
3091 assert(sde_buffer != NULL, "null sde buffer");
3092
3093 // Don't bother storing it if there is no way to retrieve it
3094 if (JvmtiExport::can_get_source_debug_extension()) {
3095 assert((length+1) > length, "Overflow checking");
3096 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3097 for (int i = 0; i < length; i++) {
3098 sde[i] = sde_buffer[i];
3099 }
3100 sde[length] = '\0';
3101 set_class_sde_buffer((const char*)sde, length);
3102 }
3103 // Got utf8 string, set stream position forward
3104 cfs->skip_u1(length, CHECK);
3105 }
3106
3107
3108 // Inner classes can be static, private or protected (classic VM does this)
3109 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3110 JVM_ACC_PRIVATE | \
3111 JVM_ACC_PROTECTED | \
3112 JVM_ACC_STATIC \
3113 )
3114
3115 // Return number of classes in the inner classes attribute table
3116 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3117 const u1* const inner_classes_attribute_start,
3118 bool parsed_enclosingmethod_attribute,
3119 u2 enclosing_method_class_index,
3120 u2 enclosing_method_method_index,
3121 TRAPS) {
3122 const u1* const current_mark = cfs->current();
3123 u2 length = 0;
3124 if (inner_classes_attribute_start != NULL) {
3125 cfs->set_current(inner_classes_attribute_start);
3126 cfs->guarantee_more(2, CHECK_0); // length
3127 length = cfs->get_u2_fast();
3128 }
3129
3130 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3131 // method data:
3132 // [inner_class_info_index,
3133 // outer_class_info_index,
3134 // inner_name_index,
3135 // inner_class_access_flags,
3136 // ...
3137 // enclosing_method_class_index,
3138 // enclosing_method_method_index]
3139 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3140 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3141 _inner_classes = inner_classes;
3142
3143 int index = 0;
3144 const int cp_size = _cp->length();
3145 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3146 for (int n = 0; n < length; n++) {
3147 // Inner class index
3148 const u2 inner_class_info_index = cfs->get_u2_fast();
3149 check_property(
3150 valid_klass_reference_at(inner_class_info_index),
3151 "inner_class_info_index %u has bad constant type in class file %s",
3152 inner_class_info_index, CHECK_0);
3153 // Outer class index
3154 const u2 outer_class_info_index = cfs->get_u2_fast();
3155 check_property(
3156 outer_class_info_index == 0 ||
3157 valid_klass_reference_at(outer_class_info_index),
3158 "outer_class_info_index %u has bad constant type in class file %s",
3159 outer_class_info_index, CHECK_0);
3160 // Inner class name
3161 const u2 inner_name_index = cfs->get_u2_fast();
3162 check_property(
3163 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3164 "inner_name_index %u has bad constant type in class file %s",
3165 inner_name_index, CHECK_0);
3166 if (_need_verify) {
3167 guarantee_property(inner_class_info_index != outer_class_info_index,
3168 "Class is both outer and inner class in class file %s", CHECK_0);
3169 }
3170 // Access flags
3171 jint flags;
3172 // JVM_ACC_MODULE is defined in JDK-9 and later.
3173 if (_major_version >= JAVA_9_VERSION) {
3174 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3175 } else {
3176 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3177 }
3178 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3179 // Set abstract bit for old class files for backward compatibility
3180 flags |= JVM_ACC_ABSTRACT;
3181 }
3182 verify_legal_class_modifiers(flags, CHECK_0);
3183 AccessFlags inner_access_flags(flags);
3184
3185 inner_classes->at_put(index++, inner_class_info_index);
3186 inner_classes->at_put(index++, outer_class_info_index);
3187 inner_classes->at_put(index++, inner_name_index);
3188 inner_classes->at_put(index++, inner_access_flags.as_short());
3189 }
3190
3191 // 4347400: make sure there's no duplicate entry in the classes array
3192 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3193 for(int i = 0; i < length * 4; i += 4) {
3194 for(int j = i + 4; j < length * 4; j += 4) {
3195 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3196 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3197 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3198 inner_classes->at(i+3) != inner_classes->at(j+3)),
3199 "Duplicate entry in InnerClasses in class file %s",
3200 CHECK_0);
3201 }
3202 }
3203 }
3204
3205 // Set EnclosingMethod class and method indexes.
3206 if (parsed_enclosingmethod_attribute) {
3207 inner_classes->at_put(index++, enclosing_method_class_index);
3208 inner_classes->at_put(index++, enclosing_method_method_index);
3209 }
3210 assert(index == size, "wrong size");
3211
3212 // Restore buffer's current position.
3213 cfs->set_current(current_mark);
3214
3215 return length;
3216 }
3217
3218 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3219 set_class_synthetic_flag(true);
3220 }
3221
3222 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3223 assert(cfs != NULL, "invariant");
3224
3225 const u2 signature_index = cfs->get_u2(CHECK);
3226 check_property(
3227 valid_symbol_at(signature_index),
3228 "Invalid constant pool index %u in Signature attribute in class file %s",
3229 signature_index, CHECK);
3230 set_class_generic_signature_index(signature_index);
3231 }
3232
3233 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3234 ConstantPool* cp,
3235 u4 attribute_byte_length,
3236 TRAPS) {
3237 assert(cfs != NULL, "invariant");
3238 assert(cp != NULL, "invariant");
3239
3240 const u1* const current_start = cfs->current();
3241
3242 guarantee_property(attribute_byte_length >= sizeof(u2),
3243 "Invalid BootstrapMethods attribute length %u in class file %s",
3244 attribute_byte_length,
3245 CHECK);
3246
3247 cfs->guarantee_more(attribute_byte_length, CHECK);
3248
3249 const int attribute_array_length = cfs->get_u2_fast();
3250
3251 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3252 "Short length on BootstrapMethods in class file %s",
3253 CHECK);
3254
3255
3256 // The attribute contains a counted array of counted tuples of shorts,
3257 // represending bootstrap specifiers:
3258 // length*{bootstrap_method_index, argument_count*{argument_index}}
3259 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3260 // operand_count = number of shorts in attr, except for leading length
3261
3262 // The attribute is copied into a short[] array.
3263 // The array begins with a series of short[2] pairs, one for each tuple.
3264 const int index_size = (attribute_array_length * 2);
3265
3266 Array<u2>* const operands =
3267 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3268
3269 // Eagerly assign operands so they will be deallocated with the constant
3270 // pool if there is an error.
3271 cp->set_operands(operands);
3272
3273 int operand_fill_index = index_size;
3274 const int cp_size = cp->length();
3275
3276 for (int n = 0; n < attribute_array_length; n++) {
3277 // Store a 32-bit offset into the header of the operand array.
3278 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3279
3280 // Read a bootstrap specifier.
3281 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3282 const u2 bootstrap_method_index = cfs->get_u2_fast();
3283 const u2 argument_count = cfs->get_u2_fast();
3284 check_property(
3285 valid_cp_range(bootstrap_method_index, cp_size) &&
3286 cp->tag_at(bootstrap_method_index).is_method_handle(),
3287 "bootstrap_method_index %u has bad constant type in class file %s",
3288 bootstrap_method_index,
3289 CHECK);
3290
3291 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3292 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3293 CHECK);
3294
3295 operands->at_put(operand_fill_index++, bootstrap_method_index);
3296 operands->at_put(operand_fill_index++, argument_count);
3297
3298 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3299 for (int j = 0; j < argument_count; j++) {
3300 const u2 argument_index = cfs->get_u2_fast();
3301 check_property(
3302 valid_cp_range(argument_index, cp_size) &&
3303 cp->tag_at(argument_index).is_loadable_constant(),
3304 "argument_index %u has bad constant type in class file %s",
3305 argument_index,
3306 CHECK);
3307 operands->at_put(operand_fill_index++, argument_index);
3308 }
3309 }
3310 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3311 "Bad length on BootstrapMethods in class file %s",
3312 CHECK);
3313 }
3314
3315 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3316 ConstantPool* cp,
3317 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3318 TRAPS) {
3319 assert(cfs != NULL, "invariant");
3320 assert(cp != NULL, "invariant");
3321 assert(parsed_annotations != NULL, "invariant");
3322
3323 // Set inner classes attribute to default sentinel
3324 _inner_classes = Universe::the_empty_short_array();
3325 cfs->guarantee_more(2, CHECK); // attributes_count
3326 u2 attributes_count = cfs->get_u2_fast();
3327 bool parsed_sourcefile_attribute = false;
3328 bool parsed_innerclasses_attribute = false;
3329 bool parsed_enclosingmethod_attribute = false;
3330 bool parsed_bootstrap_methods_attribute = false;
3331 const u1* runtime_visible_annotations = NULL;
3332 int runtime_visible_annotations_length = 0;
3333 const u1* runtime_invisible_annotations = NULL;
3334 int runtime_invisible_annotations_length = 0;
3335 const u1* runtime_visible_type_annotations = NULL;
3336 int runtime_visible_type_annotations_length = 0;
3337 const u1* runtime_invisible_type_annotations = NULL;
3338 int runtime_invisible_type_annotations_length = 0;
3339 bool runtime_invisible_type_annotations_exists = false;
3340 bool runtime_invisible_annotations_exists = false;
3341 bool parsed_source_debug_ext_annotations_exist = false;
3342 const u1* inner_classes_attribute_start = NULL;
3343 u4 inner_classes_attribute_length = 0;
3344 u2 enclosing_method_class_index = 0;
3345 u2 enclosing_method_method_index = 0;
3346 // Iterate over attributes
3347 while (attributes_count--) {
3348 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3349 const u2 attribute_name_index = cfs->get_u2_fast();
3350 const u4 attribute_length = cfs->get_u4_fast();
3351 check_property(
3352 valid_symbol_at(attribute_name_index),
3353 "Attribute name has bad constant pool index %u in class file %s",
3354 attribute_name_index, CHECK);
3355 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3356 if (tag == vmSymbols::tag_source_file()) {
3357 // Check for SourceFile tag
3358 if (_need_verify) {
3359 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3360 }
3361 if (parsed_sourcefile_attribute) {
3362 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3363 } else {
3364 parsed_sourcefile_attribute = true;
3365 }
3366 parse_classfile_sourcefile_attribute(cfs, CHECK);
3367 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3368 // Check for SourceDebugExtension tag
3369 if (parsed_source_debug_ext_annotations_exist) {
3370 classfile_parse_error(
3371 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3372 }
3373 parsed_source_debug_ext_annotations_exist = true;
3374 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3375 } else if (tag == vmSymbols::tag_inner_classes()) {
3376 // Check for InnerClasses tag
3377 if (parsed_innerclasses_attribute) {
3378 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3379 } else {
3380 parsed_innerclasses_attribute = true;
3381 }
3382 inner_classes_attribute_start = cfs->current();
3383 inner_classes_attribute_length = attribute_length;
3384 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3385 } else if (tag == vmSymbols::tag_synthetic()) {
3386 // Check for Synthetic tag
3387 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3388 if (attribute_length != 0) {
3389 classfile_parse_error(
3390 "Invalid Synthetic classfile attribute length %u in class file %s",
3391 attribute_length, CHECK);
3392 }
3393 parse_classfile_synthetic_attribute(CHECK);
3394 } else if (tag == vmSymbols::tag_deprecated()) {
3395 // Check for Deprecatd tag - 4276120
3396 if (attribute_length != 0) {
3397 classfile_parse_error(
3398 "Invalid Deprecated classfile attribute length %u in class file %s",
3399 attribute_length, CHECK);
3400 }
3401 } else if (_major_version >= JAVA_1_5_VERSION) {
3402 if (tag == vmSymbols::tag_signature()) {
3403 if (_generic_signature_index != 0) {
3404 classfile_parse_error(
3405 "Multiple Signature attributes in class file %s", CHECK);
3406 }
3407 if (attribute_length != 2) {
3408 classfile_parse_error(
3409 "Wrong Signature attribute length %u in class file %s",
3410 attribute_length, CHECK);
3411 }
3412 parse_classfile_signature_attribute(cfs, CHECK);
3413 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3414 if (runtime_visible_annotations != NULL) {
3415 classfile_parse_error(
3416 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3417 }
3418 runtime_visible_annotations_length = attribute_length;
3419 runtime_visible_annotations = cfs->current();
3420 assert(runtime_visible_annotations != NULL, "null visible annotations");
3421 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3422 parse_annotations(cp,
3423 runtime_visible_annotations,
3424 runtime_visible_annotations_length,
3425 parsed_annotations,
3426 _loader_data,
3427 CHECK);
3428 cfs->skip_u1_fast(runtime_visible_annotations_length);
3429 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3430 if (runtime_invisible_annotations_exists) {
3431 classfile_parse_error(
3432 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3433 }
3434 runtime_invisible_annotations_exists = true;
3435 if (PreserveAllAnnotations) {
3436 runtime_invisible_annotations_length = attribute_length;
3437 runtime_invisible_annotations = cfs->current();
3438 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3439 }
3440 cfs->skip_u1(attribute_length, CHECK);
3441 } else if (tag == vmSymbols::tag_enclosing_method()) {
3442 if (parsed_enclosingmethod_attribute) {
3443 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3444 } else {
3445 parsed_enclosingmethod_attribute = true;
3446 }
3447 guarantee_property(attribute_length == 4,
3448 "Wrong EnclosingMethod attribute length %u in class file %s",
3449 attribute_length, CHECK);
3450 cfs->guarantee_more(4, CHECK); // class_index, method_index
3451 enclosing_method_class_index = cfs->get_u2_fast();
3452 enclosing_method_method_index = cfs->get_u2_fast();
3453 if (enclosing_method_class_index == 0) {
3454 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3455 }
3456 // Validate the constant pool indices and types
3457 check_property(valid_klass_reference_at(enclosing_method_class_index),
3458 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3459 if (enclosing_method_method_index != 0 &&
3460 (!cp->is_within_bounds(enclosing_method_method_index) ||
3461 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3462 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3463 }
3464 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3465 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3466 if (parsed_bootstrap_methods_attribute) {
3467 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3468 }
3469 parsed_bootstrap_methods_attribute = true;
3470 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3471 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3472 if (runtime_visible_type_annotations != NULL) {
3473 classfile_parse_error(
3474 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3475 }
3476 runtime_visible_type_annotations_length = attribute_length;
3477 runtime_visible_type_annotations = cfs->current();
3478 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3479 // No need for the VM to parse Type annotations
3480 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3481 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3482 if (runtime_invisible_type_annotations_exists) {
3483 classfile_parse_error(
3484 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3485 } else {
3486 runtime_invisible_type_annotations_exists = true;
3487 }
3488 if (PreserveAllAnnotations) {
3489 runtime_invisible_type_annotations_length = attribute_length;
3490 runtime_invisible_type_annotations = cfs->current();
3491 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3492 }
3493 cfs->skip_u1(attribute_length, CHECK);
3494 } else {
3495 // Unknown attribute
3496 cfs->skip_u1(attribute_length, CHECK);
3497 }
3498 } else {
3499 // Unknown attribute
3500 cfs->skip_u1(attribute_length, CHECK);
3501 }
3502 }
3503 _annotations = assemble_annotations(runtime_visible_annotations,
3504 runtime_visible_annotations_length,
3505 runtime_invisible_annotations,
3506 runtime_invisible_annotations_length,
3507 CHECK);
3508 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3509 runtime_visible_type_annotations_length,
3510 runtime_invisible_type_annotations,
3511 runtime_invisible_type_annotations_length,
3512 CHECK);
3513
3514 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3515 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3516 cfs,
3517 inner_classes_attribute_start,
3518 parsed_innerclasses_attribute,
3519 enclosing_method_class_index,
3520 enclosing_method_method_index,
3521 CHECK);
3522 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3523 guarantee_property(
3524 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3525 "Wrong InnerClasses attribute length in class file %s", CHECK);
3526 }
3527 }
3528
3529 if (_max_bootstrap_specifier_index >= 0) {
3530 guarantee_property(parsed_bootstrap_methods_attribute,
3531 "Missing BootstrapMethods attribute in class file %s", CHECK);
3532 }
3533 }
3534
3535 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3536 assert(k != NULL, "invariant");
3537
3538 if (_synthetic_flag)
3539 k->set_is_synthetic();
3540 if (_sourcefile_index != 0) {
3541 k->set_source_file_name_index(_sourcefile_index);
3542 }
3543 if (_generic_signature_index != 0) {
3544 k->set_generic_signature_index(_generic_signature_index);
3545 }
3546 if (_sde_buffer != NULL) {
3547 k->set_source_debug_extension(_sde_buffer, _sde_length);
3548 }
3549 }
3550
3551 // Create the Annotations object that will
3552 // hold the annotations array for the Klass.
3553 void ClassFileParser::create_combined_annotations(TRAPS) {
3554 if (_annotations == NULL &&
3555 _type_annotations == NULL &&
3556 _fields_annotations == NULL &&
3557 _fields_type_annotations == NULL) {
3558 // Don't create the Annotations object unnecessarily.
3559 return;
3560 }
3561
3562 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3563 annotations->set_class_annotations(_annotations);
3564 annotations->set_class_type_annotations(_type_annotations);
3565 annotations->set_fields_annotations(_fields_annotations);
3566 annotations->set_fields_type_annotations(_fields_type_annotations);
3567
3568 // This is the Annotations object that will be
3569 // assigned to InstanceKlass being constructed.
3570 _combined_annotations = annotations;
3571
3572 // The annotations arrays below has been transfered the
3573 // _combined_annotations so these fields can now be cleared.
3574 _annotations = NULL;
3575 _type_annotations = NULL;
3576 _fields_annotations = NULL;
3577 _fields_type_annotations = NULL;
3578 }
3579
3580 // Transfer ownership of metadata allocated to the InstanceKlass.
3581 void ClassFileParser::apply_parsed_class_metadata(
3582 InstanceKlass* this_klass,
3583 int java_fields_count, TRAPS) {
3584 assert(this_klass != NULL, "invariant");
3585
3586 _cp->set_pool_holder(this_klass);
3587 this_klass->set_constants(_cp);
3588 this_klass->set_fields(_fields, java_fields_count);
3589 this_klass->set_methods(_methods);
3590 this_klass->set_inner_classes(_inner_classes);
3591 this_klass->set_local_interfaces(_local_interfaces);
3592 this_klass->set_transitive_interfaces(_transitive_interfaces);
3593 this_klass->set_annotations(_combined_annotations);
3594
3595 // Clear out these fields so they don't get deallocated by the destructor
3596 clear_class_metadata();
3597 }
3598
3599 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3600 int runtime_visible_annotations_length,
3601 const u1* const runtime_invisible_annotations,
3602 int runtime_invisible_annotations_length,
3603 TRAPS) {
3604 AnnotationArray* annotations = NULL;
3605 if (runtime_visible_annotations != NULL ||
3606 runtime_invisible_annotations != NULL) {
3607 annotations = MetadataFactory::new_array<u1>(_loader_data,
3608 runtime_visible_annotations_length +
3609 runtime_invisible_annotations_length,
3610 CHECK_(annotations));
3611 if (runtime_visible_annotations != NULL) {
3612 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3613 annotations->at_put(i, runtime_visible_annotations[i]);
3614 }
3615 }
3616 if (runtime_invisible_annotations != NULL) {
3617 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3618 int append = runtime_visible_annotations_length+i;
3619 annotations->at_put(append, runtime_invisible_annotations[i]);
3620 }
3621 }
3622 }
3623 return annotations;
3624 }
3625
3626 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3627 const int super_class_index,
3628 const bool need_verify,
3629 TRAPS) {
3630 assert(cp != NULL, "invariant");
3631 const InstanceKlass* super_klass = NULL;
3632
3633 if (super_class_index == 0) {
3634 check_property(_class_name == vmSymbols::java_lang_Object(),
3635 "Invalid superclass index %u in class file %s",
3636 super_class_index,
3637 CHECK_NULL);
3638 } else {
3639 check_property(valid_klass_reference_at(super_class_index),
3640 "Invalid superclass index %u in class file %s",
3641 super_class_index,
3642 CHECK_NULL);
3643 // The class name should be legal because it is checked when parsing constant pool.
3644 // However, make sure it is not an array type.
3645 bool is_array = false;
3646 if (cp->tag_at(super_class_index).is_klass()) {
3647 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3648 if (need_verify)
3649 is_array = super_klass->is_array_klass();
3650 } else if (need_verify) {
3651 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3652 }
3653 if (need_verify) {
3654 guarantee_property(!is_array,
3655 "Bad superclass name in class file %s", CHECK_NULL);
3656 }
3657 }
3658 return super_klass;
3659 }
3660
3661 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3662 unsigned int nonstatic_oop_map_count,
3663 int first_nonstatic_oop_offset) {
3664
3665 unsigned int map_count =
3666 NULL == super ? 0 : super->nonstatic_oop_map_count();
3667 if (nonstatic_oop_map_count > 0) {
3668 // We have oops to add to map
3669 if (map_count == 0) {
3670 map_count = nonstatic_oop_map_count;
3671 }
3672 else {
3673 // Check whether we should add a new map block or whether the last one can
3674 // be extended
3675 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3676 const OopMapBlock* const last_map = first_map + map_count - 1;
3677
3678 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3679 if (next_offset == first_nonstatic_oop_offset) {
3680 // There is no gap bettwen superklass's last oop field and first
3681 // local oop field, merge maps.
3682 nonstatic_oop_map_count -= 1;
3683 }
3684 else {
3685 // Superklass didn't end with a oop field, add extra maps
3686 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3687 }
3688 map_count += nonstatic_oop_map_count;
3689 }
3690 }
3691 return map_count;
3692 }
3693
3694 #ifndef PRODUCT
3695 static void print_field_layout(const Symbol* name,
3696 Array<u2>* fields,
3697 const constantPoolHandle& cp,
3698 int instance_size,
3699 int instance_fields_start,
3700 int instance_fields_end,
3701 int static_fields_end) {
3702
3703 assert(name != NULL, "invariant");
3704
3705 tty->print("%s: field layout\n", name->as_klass_external_name());
3706 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3707 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3708 if (!fs.access_flags().is_static()) {
3709 tty->print(" @%3d \"%s\" %s\n",
3710 fs.offset(),
3711 fs.name()->as_klass_external_name(),
3712 fs.signature()->as_klass_external_name());
3713 }
3714 }
3715 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3716 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3717 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3718 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3719 if (fs.access_flags().is_static()) {
3720 tty->print(" @%3d \"%s\" %s\n",
3721 fs.offset(),
3722 fs.name()->as_klass_external_name(),
3723 fs.signature()->as_klass_external_name());
3724 }
3725 }
3726 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3727 tty->print("\n");
3728 }
3729 #endif
3730
3731 // Values needed for oopmap and InstanceKlass creation
3732 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3733 public:
3734 int* nonstatic_oop_offsets;
3735 unsigned int* nonstatic_oop_counts;
3736 unsigned int nonstatic_oop_map_count;
3737 unsigned int total_oop_map_count;
3738 int instance_size;
3739 int nonstatic_field_size;
3740 int static_field_size;
3741 bool has_nonstatic_fields;
3742 };
3743
3744 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3745 void ClassFileParser::layout_fields(ConstantPool* cp,
3746 const FieldAllocationCount* fac,
3747 const ClassAnnotationCollector* parsed_annotations,
3748 FieldLayoutInfo* info,
3749 TRAPS) {
3750
3751 assert(cp != NULL, "invariant");
3752
3753 // Field size and offset computation
3754 int nonstatic_field_size = _super_klass == NULL ? 0 :
3755 _super_klass->nonstatic_field_size();
3756
3757 // Count the contended fields by type.
3758 //
3759 // We ignore static fields, because @Contended is not supported for them.
3760 // The layout code below will also ignore the static fields.
3761 int nonstatic_contended_count = 0;
3762 FieldAllocationCount fac_contended;
3763 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3764 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3765 if (fs.is_contended()) {
3766 fac_contended.count[atype]++;
3767 if (!fs.access_flags().is_static()) {
3768 nonstatic_contended_count++;
3769 }
3770 }
3771 }
3772
3773
3774 // Calculate the starting byte offsets
3775 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3776 int next_static_double_offset = next_static_oop_offset +
3777 ((fac->count[STATIC_OOP]) * heapOopSize);
3778 if (fac->count[STATIC_DOUBLE]) {
3779 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3780 }
3781
3782 int next_static_word_offset = next_static_double_offset +
3783 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3784 int next_static_short_offset = next_static_word_offset +
3785 ((fac->count[STATIC_WORD]) * BytesPerInt);
3786 int next_static_byte_offset = next_static_short_offset +
3787 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3788
3789 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3790 nonstatic_field_size * heapOopSize;
3791
3792 int next_nonstatic_field_offset = nonstatic_fields_start;
3793
3794 const bool is_contended_class = parsed_annotations->is_contended();
3795
3796 // Class is contended, pad before all the fields
3797 if (is_contended_class) {
3798 next_nonstatic_field_offset += ContendedPaddingWidth;
3799 }
3800
3801 // Compute the non-contended fields count.
3802 // The packing code below relies on these counts to determine if some field
3803 // can be squeezed into the alignment gap. Contended fields are obviously
3804 // exempt from that.
3805 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3806 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3807 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3808 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3809 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3810
3811 // Total non-static fields count, including every contended field
3812 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3813 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3814 fac->count[NONSTATIC_OOP];
3815
3816 const bool super_has_nonstatic_fields =
3817 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3818 const bool has_nonstatic_fields =
3819 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3820
3821
3822 // Prepare list of oops for oop map generation.
3823 //
3824 // "offset" and "count" lists are describing the set of contiguous oop
3825 // regions. offset[i] is the start of the i-th region, which then has
3826 // count[i] oops following. Before we know how many regions are required,
3827 // we pessimistically allocate the maps to fit all the oops into the
3828 // distinct regions.
3829 //
3830 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3831 // to figure out if we still need to do this.
3832 unsigned int nonstatic_oop_map_count = 0;
3833 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3834
3835 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3836 THREAD, int, max_nonstatic_oop_maps);
3837 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3838 THREAD, unsigned int, max_nonstatic_oop_maps);
3839
3840 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3841
3842 bool compact_fields = CompactFields;
3843 int allocation_style = FieldsAllocationStyle;
3844 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3845 assert(false, "0 <= FieldsAllocationStyle <= 2");
3846 allocation_style = 1; // Optimistic
3847 }
3848
3849 // The next classes have predefined hard-coded fields offsets
3850 // (see in JavaClasses::compute_hard_coded_offsets()).
3851 // Use default fields allocation order for them.
3852 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3853 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3854 _class_name == vmSymbols::java_lang_Class() ||
3855 _class_name == vmSymbols::java_lang_ClassLoader() ||
3856 _class_name == vmSymbols::java_lang_ref_Reference() ||
3857 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3858 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3859 _class_name == vmSymbols::java_lang_String() ||
3860 _class_name == vmSymbols::java_lang_Throwable() ||
3861 _class_name == vmSymbols::java_lang_Boolean() ||
3862 _class_name == vmSymbols::java_lang_Character() ||
3863 _class_name == vmSymbols::java_lang_Float() ||
3864 _class_name == vmSymbols::java_lang_Double() ||
3865 _class_name == vmSymbols::java_lang_Byte() ||
3866 _class_name == vmSymbols::java_lang_Short() ||
3867 _class_name == vmSymbols::java_lang_Integer() ||
3868 _class_name == vmSymbols::java_lang_Long())) {
3869 allocation_style = 0; // Allocate oops first
3870 compact_fields = false; // Don't compact fields
3871 }
3872
3873 int next_nonstatic_oop_offset = 0;
3874 int next_nonstatic_double_offset = 0;
3875
3876 // Rearrange fields for a given allocation style
3877 if( allocation_style == 0 ) {
3878 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3879 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3880 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3881 (nonstatic_oop_count * heapOopSize);
3882 } else if( allocation_style == 1 ) {
3883 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3884 next_nonstatic_double_offset = next_nonstatic_field_offset;
3885 } else if( allocation_style == 2 ) {
3886 // Fields allocation: oops fields in super and sub classes are together.
3887 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3888 _super_klass->nonstatic_oop_map_size() > 0 ) {
3889 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3890 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3891 const OopMapBlock* const last_map = first_map + map_count - 1;
3892 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3893 if (next_offset == next_nonstatic_field_offset) {
3894 allocation_style = 0; // allocate oops first
3895 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3896 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3897 (nonstatic_oop_count * heapOopSize);
3898 }
3899 }
3900 if( allocation_style == 2 ) {
3901 allocation_style = 1; // allocate oops last
3902 next_nonstatic_double_offset = next_nonstatic_field_offset;
3903 }
3904 } else {
3905 ShouldNotReachHere();
3906 }
3907
3908 int nonstatic_oop_space_count = 0;
3909 int nonstatic_word_space_count = 0;
3910 int nonstatic_short_space_count = 0;
3911 int nonstatic_byte_space_count = 0;
3912 int nonstatic_oop_space_offset = 0;
3913 int nonstatic_word_space_offset = 0;
3914 int nonstatic_short_space_offset = 0;
3915 int nonstatic_byte_space_offset = 0;
3916
3917 // Try to squeeze some of the fields into the gaps due to
3918 // long/double alignment.
3919 if (nonstatic_double_count > 0) {
3920 int offset = next_nonstatic_double_offset;
3921 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3922 if (compact_fields && offset != next_nonstatic_double_offset) {
3923 // Allocate available fields into the gap before double field.
3924 int length = next_nonstatic_double_offset - offset;
3925 assert(length == BytesPerInt, "");
3926 nonstatic_word_space_offset = offset;
3927 if (nonstatic_word_count > 0) {
3928 nonstatic_word_count -= 1;
3929 nonstatic_word_space_count = 1; // Only one will fit
3930 length -= BytesPerInt;
3931 offset += BytesPerInt;
3932 }
3933 nonstatic_short_space_offset = offset;
3934 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3935 nonstatic_short_count -= 1;
3936 nonstatic_short_space_count += 1;
3937 length -= BytesPerShort;
3938 offset += BytesPerShort;
3939 }
3940 nonstatic_byte_space_offset = offset;
3941 while (length > 0 && nonstatic_byte_count > 0) {
3942 nonstatic_byte_count -= 1;
3943 nonstatic_byte_space_count += 1;
3944 length -= 1;
3945 }
3946 // Allocate oop field in the gap if there are no other fields for that.
3947 nonstatic_oop_space_offset = offset;
3948 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3949 allocation_style != 0) { // when oop fields not first
3950 nonstatic_oop_count -= 1;
3951 nonstatic_oop_space_count = 1; // Only one will fit
3952 length -= heapOopSize;
3953 offset += heapOopSize;
3954 }
3955 }
3956 }
3957
3958 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3959 (nonstatic_double_count * BytesPerLong);
3960 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3961 (nonstatic_word_count * BytesPerInt);
3962 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3963 (nonstatic_short_count * BytesPerShort);
3964 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3965 nonstatic_byte_count;
3966
3967 // let oops jump before padding with this allocation style
3968 if( allocation_style == 1 ) {
3969 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3970 if( nonstatic_oop_count > 0 ) {
3971 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
3972 }
3973 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3974 }
3975
3976 // Iterate over fields again and compute correct offsets.
3977 // The field allocation type was temporarily stored in the offset slot.
3978 // oop fields are located before non-oop fields (static and non-static).
3979 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3980
3981 // skip already laid out fields
3982 if (fs.is_offset_set()) continue;
3983
3984 // contended instance fields are handled below
3985 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3986
3987 int real_offset = 0;
3988 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
3989
3990 // pack the rest of the fields
3991 switch (atype) {
3992 case STATIC_OOP:
3993 real_offset = next_static_oop_offset;
3994 next_static_oop_offset += heapOopSize;
3995 break;
3996 case STATIC_BYTE:
3997 real_offset = next_static_byte_offset;
3998 next_static_byte_offset += 1;
3999 break;
4000 case STATIC_SHORT:
4001 real_offset = next_static_short_offset;
4002 next_static_short_offset += BytesPerShort;
4003 break;
4004 case STATIC_WORD:
4005 real_offset = next_static_word_offset;
4006 next_static_word_offset += BytesPerInt;
4007 break;
4008 case STATIC_DOUBLE:
4009 real_offset = next_static_double_offset;
4010 next_static_double_offset += BytesPerLong;
4011 break;
4012 case NONSTATIC_OOP:
4013 if( nonstatic_oop_space_count > 0 ) {
4014 real_offset = nonstatic_oop_space_offset;
4015 nonstatic_oop_space_offset += heapOopSize;
4016 nonstatic_oop_space_count -= 1;
4017 } else {
4018 real_offset = next_nonstatic_oop_offset;
4019 next_nonstatic_oop_offset += heapOopSize;
4020 }
4021
4022 // Record this oop in the oop maps
4023 if( nonstatic_oop_map_count > 0 &&
4024 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4025 real_offset -
4026 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4027 heapOopSize ) {
4028 // This oop is adjacent to the previous one, add to current oop map
4029 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4030 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4031 } else {
4032 // This oop is not adjacent to the previous one, create new oop map
4033 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4034 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4035 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4036 nonstatic_oop_map_count += 1;
4037 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4038 first_nonstatic_oop_offset = real_offset;
4039 }
4040 }
4041 break;
4042 case NONSTATIC_BYTE:
4043 if( nonstatic_byte_space_count > 0 ) {
4044 real_offset = nonstatic_byte_space_offset;
4045 nonstatic_byte_space_offset += 1;
4046 nonstatic_byte_space_count -= 1;
4047 } else {
4048 real_offset = next_nonstatic_byte_offset;
4049 next_nonstatic_byte_offset += 1;
4050 }
4051 break;
4052 case NONSTATIC_SHORT:
4053 if( nonstatic_short_space_count > 0 ) {
4054 real_offset = nonstatic_short_space_offset;
4055 nonstatic_short_space_offset += BytesPerShort;
4056 nonstatic_short_space_count -= 1;
4057 } else {
4058 real_offset = next_nonstatic_short_offset;
4059 next_nonstatic_short_offset += BytesPerShort;
4060 }
4061 break;
4062 case NONSTATIC_WORD:
4063 if( nonstatic_word_space_count > 0 ) {
4064 real_offset = nonstatic_word_space_offset;
4065 nonstatic_word_space_offset += BytesPerInt;
4066 nonstatic_word_space_count -= 1;
4067 } else {
4068 real_offset = next_nonstatic_word_offset;
4069 next_nonstatic_word_offset += BytesPerInt;
4070 }
4071 break;
4072 case NONSTATIC_DOUBLE:
4073 real_offset = next_nonstatic_double_offset;
4074 next_nonstatic_double_offset += BytesPerLong;
4075 break;
4076 default:
4077 ShouldNotReachHere();
4078 }
4079 fs.set_offset(real_offset);
4080 }
4081
4082
4083 // Handle the contended cases.
4084 //
4085 // Each contended field should not intersect the cache line with another contended field.
4086 // In the absence of alignment information, we end up with pessimistically separating
4087 // the fields with full-width padding.
4088 //
4089 // Additionally, this should not break alignment for the fields, so we round the alignment up
4090 // for each field.
4091 if (nonstatic_contended_count > 0) {
4092
4093 // if there is at least one contended field, we need to have pre-padding for them
4094 next_nonstatic_padded_offset += ContendedPaddingWidth;
4095
4096 // collect all contended groups
4097 ResourceBitMap bm(cp->size());
4098 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4099 // skip already laid out fields
4100 if (fs.is_offset_set()) continue;
4101
4102 if (fs.is_contended()) {
4103 bm.set_bit(fs.contended_group());
4104 }
4105 }
4106
4107 int current_group = -1;
4108 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4109
4110 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4111
4112 // skip already laid out fields
4113 if (fs.is_offset_set()) continue;
4114
4115 // skip non-contended fields and fields from different group
4116 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4117
4118 // handle statics below
4119 if (fs.access_flags().is_static()) continue;
4120
4121 int real_offset = 0;
4122 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4123
4124 switch (atype) {
4125 case NONSTATIC_BYTE:
4126 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4127 real_offset = next_nonstatic_padded_offset;
4128 next_nonstatic_padded_offset += 1;
4129 break;
4130
4131 case NONSTATIC_SHORT:
4132 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4133 real_offset = next_nonstatic_padded_offset;
4134 next_nonstatic_padded_offset += BytesPerShort;
4135 break;
4136
4137 case NONSTATIC_WORD:
4138 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4139 real_offset = next_nonstatic_padded_offset;
4140 next_nonstatic_padded_offset += BytesPerInt;
4141 break;
4142
4143 case NONSTATIC_DOUBLE:
4144 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4145 real_offset = next_nonstatic_padded_offset;
4146 next_nonstatic_padded_offset += BytesPerLong;
4147 break;
4148
4149 case NONSTATIC_OOP:
4150 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4151 real_offset = next_nonstatic_padded_offset;
4152 next_nonstatic_padded_offset += heapOopSize;
4153
4154 // Record this oop in the oop maps
4155 if( nonstatic_oop_map_count > 0 &&
4156 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4157 real_offset -
4158 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4159 heapOopSize ) {
4160 // This oop is adjacent to the previous one, add to current oop map
4161 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4162 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4163 } else {
4164 // This oop is not adjacent to the previous one, create new oop map
4165 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4166 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4167 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4168 nonstatic_oop_map_count += 1;
4169 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4170 first_nonstatic_oop_offset = real_offset;
4171 }
4172 }
4173 break;
4174
4175 default:
4176 ShouldNotReachHere();
4177 }
4178
4179 if (fs.contended_group() == 0) {
4180 // Contended group defines the equivalence class over the fields:
4181 // the fields within the same contended group are not inter-padded.
4182 // The only exception is default group, which does not incur the
4183 // equivalence, and so requires intra-padding.
4184 next_nonstatic_padded_offset += ContendedPaddingWidth;
4185 }
4186
4187 fs.set_offset(real_offset);
4188 } // for
4189
4190 // Start laying out the next group.
4191 // Note that this will effectively pad the last group in the back;
4192 // this is expected to alleviate memory contention effects for
4193 // subclass fields and/or adjacent object.
4194 // If this was the default group, the padding is already in place.
4195 if (current_group != 0) {
4196 next_nonstatic_padded_offset += ContendedPaddingWidth;
4197 }
4198 }
4199
4200 // handle static fields
4201 }
4202
4203 // Entire class is contended, pad in the back.
4204 // This helps to alleviate memory contention effects for subclass fields
4205 // and/or adjacent object.
4206 if (is_contended_class) {
4207 next_nonstatic_padded_offset += ContendedPaddingWidth;
4208 }
4209
4210 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4211
4212 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4213 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4214 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4215
4216 int static_field_size = (static_fields_end -
4217 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4218 nonstatic_field_size = nonstatic_field_size +
4219 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4220
4221 int instance_size = align_object_size(instance_end / wordSize);
4222
4223 assert(instance_size == align_object_size(align_up(
4224 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4225 wordSize) / wordSize), "consistent layout helper value");
4226
4227 // Invariant: nonstatic_field end/start should only change if there are
4228 // nonstatic fields in the class, or if the class is contended. We compare
4229 // against the non-aligned value, so that end alignment will not fail the
4230 // assert without actually having the fields.
4231 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4232 is_contended_class ||
4233 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4234
4235 // Number of non-static oop map blocks allocated at end of klass.
4236 const unsigned int total_oop_map_count =
4237 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4238 first_nonstatic_oop_offset);
4239
4240 #ifndef PRODUCT
4241 if (PrintFieldLayout) {
4242 print_field_layout(_class_name,
4243 _fields,
4244 cp,
4245 instance_size,
4246 nonstatic_fields_start,
4247 nonstatic_fields_end,
4248 static_fields_end);
4249 }
4250
4251 #endif
4252 // Pass back information needed for InstanceKlass creation
4253 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4254 info->nonstatic_oop_counts = nonstatic_oop_counts;
4255 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4256 info->total_oop_map_count = total_oop_map_count;
4257 info->instance_size = instance_size;
4258 info->static_field_size = static_field_size;
4259 info->nonstatic_field_size = nonstatic_field_size;
4260 info->has_nonstatic_fields = has_nonstatic_fields;
4261 }
4262
4263 static void fill_oop_maps(const InstanceKlass* k,
4264 unsigned int nonstatic_oop_map_count,
4265 const int* nonstatic_oop_offsets,
4266 const unsigned int* nonstatic_oop_counts) {
4267
4268 assert(k != NULL, "invariant");
4269
4270 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4271 const InstanceKlass* const super = k->superklass();
4272 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4273 if (super_count > 0) {
4274 // Copy maps from superklass
4275 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4276 for (unsigned int i = 0; i < super_count; ++i) {
4277 *this_oop_map++ = *super_oop_map++;
4278 }
4279 }
4280
4281 if (nonstatic_oop_map_count > 0) {
4282 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4283 // The counts differ because there is no gap between superklass's last oop
4284 // field and the first local oop field. Extend the last oop map copied
4285 // from the superklass instead of creating new one.
4286 nonstatic_oop_map_count--;
4287 nonstatic_oop_offsets++;
4288 this_oop_map--;
4289 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4290 this_oop_map++;
4291 }
4292
4293 // Add new map blocks, fill them
4294 while (nonstatic_oop_map_count-- > 0) {
4295 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4296 this_oop_map->set_count(*nonstatic_oop_counts++);
4297 this_oop_map++;
4298 }
4299 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4300 this_oop_map, "sanity");
4301 }
4302 }
4303
4304
4305 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4306 assert(ik != NULL, "invariant");
4307
4308 const Klass* const super = ik->super();
4309
4310 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4311 // in which case we don't have to register objects as finalizable
4312 if (!_has_empty_finalizer) {
4313 if (_has_finalizer ||
4314 (super != NULL && super->has_finalizer())) {
4315 ik->set_has_finalizer();
4316 }
4317 }
4318
4319 #ifdef ASSERT
4320 bool f = false;
4321 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4322 vmSymbols::void_method_signature());
4323 if (m != NULL && !m->is_empty_method()) {
4324 f = true;
4325 }
4326
4327 // Spec doesn't prevent agent from redefinition of empty finalizer.
4328 // Despite the fact that it's generally bad idea and redefined finalizer
4329 // will not work as expected we shouldn't abort vm in this case
4330 if (!ik->has_redefined_this_or_super()) {
4331 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4332 }
4333 #endif
4334
4335 // Check if this klass supports the java.lang.Cloneable interface
4336 if (SystemDictionary::Cloneable_klass_loaded()) {
4337 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4338 ik->set_is_cloneable();
4339 }
4340 }
4341
4342 // Check if this klass has a vanilla default constructor
4343 if (super == NULL) {
4344 // java.lang.Object has empty default constructor
4345 ik->set_has_vanilla_constructor();
4346 } else {
4347 if (super->has_vanilla_constructor() &&
4348 _has_vanilla_constructor) {
4349 ik->set_has_vanilla_constructor();
4350 }
4351 #ifdef ASSERT
4352 bool v = false;
4353 if (super->has_vanilla_constructor()) {
4354 const Method* const constructor =
4355 ik->find_method(vmSymbols::object_initializer_name(),
4356 vmSymbols::void_method_signature());
4357 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4358 v = true;
4359 }
4360 }
4361 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4362 #endif
4363 }
4364
4365 // If it cannot be fast-path allocated, set a bit in the layout helper.
4366 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4367 assert(ik->size_helper() > 0, "layout_helper is initialized");
4368 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4369 || ik->is_abstract() || ik->is_interface()
4370 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4371 || ik->size_helper() >= FastAllocateSizeLimit) {
4372 // Forbid fast-path allocation.
4373 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4374 ik->set_layout_helper(lh);
4375 }
4376 }
4377
4378 // Attach super classes and interface classes to class loader data
4379 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4380 TRAPS) {
4381 assert(defined_klass != NULL, "invariant");
4382
4383 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4384 if (defining_loader_data->is_the_null_class_loader_data()) {
4385 // Dependencies to null class loader data are implicit.
4386 return;
4387 } else {
4388 // add super class dependency
4389 Klass* const super = defined_klass->super();
4390 if (super != NULL) {
4391 defining_loader_data->record_dependency(super);
4392 }
4393
4394 // add super interface dependencies
4395 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4396 if (local_interfaces != NULL) {
4397 const int length = local_interfaces->length();
4398 for (int i = 0; i < length; i++) {
4399 defining_loader_data->record_dependency(local_interfaces->at(i));
4400 }
4401 }
4402 }
4403 }
4404
4405 // utility methods for appending an array with check for duplicates
4406
4407 static void append_interfaces(GrowableArray<Klass*>* result,
4408 const Array<Klass*>* const ifs) {
4409 // iterate over new interfaces
4410 for (int i = 0; i < ifs->length(); i++) {
4411 Klass* const e = ifs->at(i);
4412 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4413 // add new interface
4414 result->append_if_missing(e);
4415 }
4416 }
4417
4418 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4419 Array<Klass*>* local_ifs,
4420 ClassLoaderData* loader_data,
4421 TRAPS) {
4422 assert(local_ifs != NULL, "invariant");
4423 assert(loader_data != NULL, "invariant");
4424
4425 // Compute maximum size for transitive interfaces
4426 int max_transitive_size = 0;
4427 int super_size = 0;
4428 // Add superclass transitive interfaces size
4429 if (super != NULL) {
4430 super_size = super->transitive_interfaces()->length();
4431 max_transitive_size += super_size;
4432 }
4433 // Add local interfaces' super interfaces
4434 const int local_size = local_ifs->length();
4435 for (int i = 0; i < local_size; i++) {
4436 Klass* const l = local_ifs->at(i);
4437 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4438 }
4439 // Finally add local interfaces
4440 max_transitive_size += local_size;
4441 // Construct array
4442 if (max_transitive_size == 0) {
4443 // no interfaces, use canonicalized array
4444 return Universe::the_empty_klass_array();
4445 } else if (max_transitive_size == super_size) {
4446 // no new local interfaces added, share superklass' transitive interface array
4447 return super->transitive_interfaces();
4448 } else if (max_transitive_size == local_size) {
4449 // only local interfaces added, share local interface array
4450 return local_ifs;
4451 } else {
4452 ResourceMark rm;
4453 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4454
4455 // Copy down from superclass
4456 if (super != NULL) {
4457 append_interfaces(result, super->transitive_interfaces());
4458 }
4459
4460 // Copy down from local interfaces' superinterfaces
4461 for (int i = 0; i < local_size; i++) {
4462 Klass* const l = local_ifs->at(i);
4463 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4464 }
4465 // Finally add local interfaces
4466 append_interfaces(result, local_ifs);
4467
4468 // length will be less than the max_transitive_size if duplicates were removed
4469 const int length = result->length();
4470 assert(length <= max_transitive_size, "just checking");
4471 Array<Klass*>* const new_result =
4472 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4473 for (int i = 0; i < length; i++) {
4474 Klass* const e = result->at(i);
4475 assert(e != NULL, "just checking");
4476 new_result->at_put(i, e);
4477 }
4478 return new_result;
4479 }
4480 }
4481
4482 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4483 assert(this_klass != NULL, "invariant");
4484 const Klass* const super = this_klass->super();
4485 if (super != NULL) {
4486
4487 // If the loader is not the boot loader then throw an exception if its
4488 // superclass is in package jdk.internal.reflect and its loader is not a
4489 // special reflection class loader
4490 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4491 assert(super->is_instance_klass(), "super is not instance klass");
4492 PackageEntry* super_package = super->package();
4493 if (super_package != NULL &&
4494 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4495 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4496 ResourceMark rm(THREAD);
4497 Exceptions::fthrow(
4498 THREAD_AND_LOCATION,
4499 vmSymbols::java_lang_IllegalAccessError(),
4500 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4501 this_klass->external_name(),
4502 this_klass->class_loader_data()->loader_name(),
4503 super->external_name());
4504 return;
4505 }
4506 }
4507
4508 Reflection::VerifyClassAccessResults vca_result =
4509 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4510 if (vca_result != Reflection::ACCESS_OK) {
4511 ResourceMark rm(THREAD);
4512 char* msg = Reflection::verify_class_access_msg(this_klass,
4513 InstanceKlass::cast(super),
4514 vca_result);
4515 if (msg == NULL) {
4516 Exceptions::fthrow(
4517 THREAD_AND_LOCATION,
4518 vmSymbols::java_lang_IllegalAccessError(),
4519 "class %s cannot access its superclass %s",
4520 this_klass->external_name(),
4521 super->external_name());
4522 } else {
4523 // Add additional message content.
4524 Exceptions::fthrow(
4525 THREAD_AND_LOCATION,
4526 vmSymbols::java_lang_IllegalAccessError(),
4527 "superclass access check failed: %s",
4528 msg);
4529 }
4530 }
4531 }
4532 }
4533
4534
4535 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4536 assert(this_klass != NULL, "invariant");
4537 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4538 const int lng = local_interfaces->length();
4539 for (int i = lng - 1; i >= 0; i--) {
4540 Klass* const k = local_interfaces->at(i);
4541 assert (k != NULL && k->is_interface(), "invalid interface");
4542 Reflection::VerifyClassAccessResults vca_result =
4543 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4544 if (vca_result != Reflection::ACCESS_OK) {
4545 ResourceMark rm(THREAD);
4546 char* msg = Reflection::verify_class_access_msg(this_klass,
4547 InstanceKlass::cast(k),
4548 vca_result);
4549 if (msg == NULL) {
4550 Exceptions::fthrow(
4551 THREAD_AND_LOCATION,
4552 vmSymbols::java_lang_IllegalAccessError(),
4553 "class %s cannot access its superinterface %s",
4554 this_klass->external_name(),
4555 k->external_name());
4556 } else {
4557 // Add additional message content.
4558 Exceptions::fthrow(
4559 THREAD_AND_LOCATION,
4560 vmSymbols::java_lang_IllegalAccessError(),
4561 "superinterface check failed: %s",
4562 msg);
4563 }
4564 }
4565 }
4566 }
4567
4568
4569 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4570 assert(this_klass != NULL, "invariant");
4571 const Array<Method*>* const methods = this_klass->methods();
4572 const int num_methods = methods->length();
4573
4574 // go thru each method and check if it overrides a final method
4575 for (int index = 0; index < num_methods; index++) {
4576 const Method* const m = methods->at(index);
4577
4578 // skip private, static, and <init> methods
4579 if ((!m->is_private() && !m->is_static()) &&
4580 (m->name() != vmSymbols::object_initializer_name())) {
4581
4582 const Symbol* const name = m->name();
4583 const Symbol* const signature = m->signature();
4584 const Klass* k = this_klass->super();
4585 const Method* super_m = NULL;
4586 while (k != NULL) {
4587 // skip supers that don't have final methods.
4588 if (k->has_final_method()) {
4589 // lookup a matching method in the super class hierarchy
4590 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4591 if (super_m == NULL) {
4592 break; // didn't find any match; get out
4593 }
4594
4595 if (super_m->is_final() && !super_m->is_static() &&
4596 // matching method in super is final, and not static
4597 (Reflection::verify_field_access(this_klass,
4598 super_m->method_holder(),
4599 super_m->method_holder(),
4600 super_m->access_flags(), false))
4601 // this class can access super final method and therefore override
4602 ) {
4603 ResourceMark rm(THREAD);
4604 Exceptions::fthrow(
4605 THREAD_AND_LOCATION,
4606 vmSymbols::java_lang_VerifyError(),
4607 "class %s overrides final method %s.%s%s",
4608 this_klass->external_name(),
4609 super_m->method_holder()->external_name(),
4610 name->as_C_string(),
4611 signature->as_C_string()
4612 );
4613 return;
4614 }
4615
4616 // continue to look from super_m's holder's super.
4617 k = super_m->method_holder()->super();
4618 continue;
4619 }
4620
4621 k = k->super();
4622 }
4623 }
4624 }
4625 }
4626
4627
4628 // assumes that this_klass is an interface
4629 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4630 assert(this_klass != NULL, "invariant");
4631 assert(this_klass->is_interface(), "not an interface");
4632 const Array<Method*>* methods = this_klass->methods();
4633 const int num_methods = methods->length();
4634
4635 for (int index = 0; index < num_methods; index++) {
4636 const Method* const m = methods->at(index);
4637 // if m is static and not the init method, throw a verify error
4638 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4639 ResourceMark rm(THREAD);
4640 Exceptions::fthrow(
4641 THREAD_AND_LOCATION,
4642 vmSymbols::java_lang_VerifyError(),
4643 "Illegal static method %s in interface %s",
4644 m->name()->as_C_string(),
4645 this_klass->external_name()
4646 );
4647 return;
4648 }
4649 }
4650 }
4651
4652 // utility methods for format checking
4653
4654 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4655 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4656 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4657 if (is_module) {
4658 ResourceMark rm(THREAD);
4659 Exceptions::fthrow(
4660 THREAD_AND_LOCATION,
4661 vmSymbols::java_lang_NoClassDefFoundError(),
4662 "%s is not a class because access_flag ACC_MODULE is set",
4663 _class_name->as_C_string());
4664 return;
4665 }
4666
4667 if (!_need_verify) { return; }
4668
4669 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4670 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4671 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4672 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4673 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4674 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4675 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4676
4677 if ((is_abstract && is_final) ||
4678 (is_interface && !is_abstract) ||
4679 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4680 (!is_interface && major_gte_15 && is_annotation)) {
4681 ResourceMark rm(THREAD);
4682 Exceptions::fthrow(
4683 THREAD_AND_LOCATION,
4684 vmSymbols::java_lang_ClassFormatError(),
4685 "Illegal class modifiers in class %s: 0x%X",
4686 _class_name->as_C_string(), flags
4687 );
4688 return;
4689 }
4690 }
4691
4692 static bool has_illegal_visibility(jint flags) {
4693 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4694 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4695 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4696
4697 return ((is_public && is_protected) ||
4698 (is_public && is_private) ||
4699 (is_protected && is_private));
4700 }
4701
4702 static bool is_supported_version(u2 major, u2 minor){
4703 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4704 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4705 (major <= max_version) &&
4706 ((major != max_version) ||
4707 (minor <= JVM_CLASSFILE_MINOR_VERSION));
4708 }
4709
4710 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4711 bool is_interface,
4712 TRAPS) const {
4713 if (!_need_verify) { return; }
4714
4715 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4716 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4717 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4718 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4719 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4720 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4721 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4722 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4723 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4724
4725 bool is_illegal = false;
4726
4727 if (is_interface) {
4728 if (!is_public || !is_static || !is_final || is_private ||
4729 is_protected || is_volatile || is_transient ||
4730 (major_gte_15 && is_enum)) {
4731 is_illegal = true;
4732 }
4733 } else { // not interface
4734 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4735 is_illegal = true;
4736 }
4737 }
4738
4739 if (is_illegal) {
4740 ResourceMark rm(THREAD);
4741 Exceptions::fthrow(
4742 THREAD_AND_LOCATION,
4743 vmSymbols::java_lang_ClassFormatError(),
4744 "Illegal field modifiers in class %s: 0x%X",
4745 _class_name->as_C_string(), flags);
4746 return;
4747 }
4748 }
4749
4750 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4751 bool is_interface,
4752 const Symbol* name,
4753 TRAPS) const {
4754 if (!_need_verify) { return; }
4755
4756 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4757 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4758 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4759 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4760 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4761 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4762 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4763 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4764 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4765 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4766 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4767 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4768 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4769
4770 bool is_illegal = false;
4771
4772 if (is_interface) {
4773 if (major_gte_8) {
4774 // Class file version is JAVA_8_VERSION or later Methods of
4775 // interfaces may set any of the flags except ACC_PROTECTED,
4776 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4777 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4778 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4779 (is_native || is_protected || is_final || is_synchronized) ||
4780 // If a specific method of a class or interface has its
4781 // ACC_ABSTRACT flag set, it must not have any of its
4782 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4783 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4784 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4785 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4786 (is_abstract && (is_private || is_static || is_strict))) {
4787 is_illegal = true;
4788 }
4789 } else if (major_gte_15) {
4790 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4791 if (!is_public || is_private || is_protected || is_static || is_final ||
4792 is_synchronized || is_native || !is_abstract || is_strict) {
4793 is_illegal = true;
4794 }
4795 } else {
4796 // Class file version is pre-JAVA_1_5_VERSION
4797 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4798 is_illegal = true;
4799 }
4800 }
4801 } else { // not interface
4802 if (has_illegal_visibility(flags)) {
4803 is_illegal = true;
4804 } else {
4805 if (is_initializer) {
4806 if (is_static || is_final || is_synchronized || is_native ||
4807 is_abstract || (major_gte_15 && is_bridge)) {
4808 is_illegal = true;
4809 }
4810 } else { // not initializer
4811 if (is_abstract) {
4812 if ((is_final || is_native || is_private || is_static ||
4813 (major_gte_15 && (is_synchronized || is_strict)))) {
4814 is_illegal = true;
4815 }
4816 }
4817 }
4818 }
4819 }
4820
4821 if (is_illegal) {
4822 ResourceMark rm(THREAD);
4823 Exceptions::fthrow(
4824 THREAD_AND_LOCATION,
4825 vmSymbols::java_lang_ClassFormatError(),
4826 "Method %s in class %s has illegal modifiers: 0x%X",
4827 name->as_C_string(), _class_name->as_C_string(), flags);
4828 return;
4829 }
4830 }
4831
4832 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4833 int length,
4834 TRAPS) const {
4835 assert(_need_verify, "only called when _need_verify is true");
4836 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4837 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4838 }
4839 }
4840
4841 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4842 // In class names, '/' separates unqualified names. This is verified in this function also.
4843 // Method names also may not contain the characters '<' or '>', unless <init>
4844 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4845 // method. Because these names have been checked as special cases before
4846 // calling this method in verify_legal_method_name.
4847 //
4848 // This method is also called from the modular system APIs in modules.cpp
4849 // to verify the validity of module and package names.
4850 bool ClassFileParser::verify_unqualified_name(const char* name,
4851 unsigned int length,
4852 int type) {
4853 for (const char* p = name; p != name + length;) {
4854 jchar ch = *p;
4855 if (ch < 128) {
4856 if (ch == '.' || ch == ';' || ch == '[' ) {
4857 return false; // do not permit '.', ';', or '['
4858 }
4859 if (ch == '/') {
4860 // check for '//' or leading or trailing '/' which are not legal
4861 // unqualified name must not be empty
4862 if (type == ClassFileParser::LegalClass) {
4863 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4864 return false;
4865 }
4866 } else {
4867 return false; // do not permit '/' unless it's class name
4868 }
4869 }
4870 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4871 return false; // do not permit '<' or '>' in method names
4872 }
4873 p++;
4874 } else {
4875 char* tmp_p = UTF8::next(p, &ch);
4876 p = tmp_p;
4877 }
4878 }
4879 return true;
4880 }
4881
4882 // Take pointer to a string. Skip over the longest part of the string that could
4883 // be taken as a fieldname. Allow '/' if slash_ok is true.
4884 // Return a pointer to just past the fieldname.
4885 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4886 // being true, we saw consecutive slashes (meaning we were looking for a
4887 // qualified path but found something that was badly-formed).
4888 static const char* skip_over_field_name(const char* name,
4889 bool slash_ok,
4890 unsigned int length) {
4891 const char* p;
4892 jboolean last_is_slash = false;
4893 jboolean not_first_ch = false;
4894
4895 for (p = name; p != name + length; not_first_ch = true) {
4896 const char* old_p = p;
4897 jchar ch = *p;
4898 if (ch < 128) {
4899 p++;
4900 // quick check for ascii
4901 if ((ch >= 'a' && ch <= 'z') ||
4902 (ch >= 'A' && ch <= 'Z') ||
4903 (ch == '_' || ch == '$') ||
4904 (not_first_ch && ch >= '0' && ch <= '9')) {
4905 last_is_slash = false;
4906 continue;
4907 }
4908 if (slash_ok && ch == '/') {
4909 if (last_is_slash) {
4910 return NULL; // Don't permit consecutive slashes
4911 }
4912 last_is_slash = true;
4913 continue;
4914 }
4915 }
4916 else {
4917 jint unicode_ch;
4918 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4919 p = tmp_p;
4920 last_is_slash = false;
4921 // Check if ch is Java identifier start or is Java identifier part
4922 // 4672820: call java.lang.Character methods directly without generating separate tables.
4923 EXCEPTION_MARK;
4924
4925 // return value
4926 JavaValue result(T_BOOLEAN);
4927 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4928 JavaCallArguments args;
4929 args.push_int(unicode_ch);
4930
4931 // public static boolean isJavaIdentifierStart(char ch);
4932 JavaCalls::call_static(&result,
4933 SystemDictionary::Character_klass(),
4934 vmSymbols::isJavaIdentifierStart_name(),
4935 vmSymbols::int_bool_signature(),
4936 &args,
4937 THREAD);
4938
4939 if (HAS_PENDING_EXCEPTION) {
4940 CLEAR_PENDING_EXCEPTION;
4941 return 0;
4942 }
4943 if (result.get_jboolean()) {
4944 continue;
4945 }
4946
4947 if (not_first_ch) {
4948 // public static boolean isJavaIdentifierPart(char ch);
4949 JavaCalls::call_static(&result,
4950 SystemDictionary::Character_klass(),
4951 vmSymbols::isJavaIdentifierPart_name(),
4952 vmSymbols::int_bool_signature(),
4953 &args,
4954 THREAD);
4955
4956 if (HAS_PENDING_EXCEPTION) {
4957 CLEAR_PENDING_EXCEPTION;
4958 return 0;
4959 }
4960
4961 if (result.get_jboolean()) {
4962 continue;
4963 }
4964 }
4965 }
4966 return (not_first_ch) ? old_p : NULL;
4967 }
4968 return (not_first_ch) ? p : NULL;
4969 }
4970
4971 // Take pointer to a string. Skip over the longest part of the string that could
4972 // be taken as a field signature. Allow "void" if void_ok.
4973 // Return a pointer to just past the signature.
4974 // Return NULL if no legal signature is found.
4975 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4976 bool void_ok,
4977 unsigned int length,
4978 TRAPS) const {
4979 unsigned int array_dim = 0;
4980 while (length > 0) {
4981 switch (signature[0]) {
4982 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4983 case JVM_SIGNATURE_BOOLEAN:
4984 case JVM_SIGNATURE_BYTE:
4985 case JVM_SIGNATURE_CHAR:
4986 case JVM_SIGNATURE_SHORT:
4987 case JVM_SIGNATURE_INT:
4988 case JVM_SIGNATURE_FLOAT:
4989 case JVM_SIGNATURE_LONG:
4990 case JVM_SIGNATURE_DOUBLE:
4991 return signature + 1;
4992 case JVM_SIGNATURE_CLASS: {
4993 if (_major_version < JAVA_1_5_VERSION) {
4994 // Skip over the class name if one is there
4995 const char* const p = skip_over_field_name(signature + 1, true, --length);
4996
4997 // The next character better be a semicolon
4998 if (p && (p - signature) > 1 && p[0] == ';') {
4999 return p + 1;
5000 }
5001 }
5002 else {
5003 // Skip leading 'L' and ignore first appearance of ';'
5004 length--;
5005 signature++;
5006 char* c = strchr((char*) signature, ';');
5007 // Format check signature
5008 if (c != NULL) {
5009 ResourceMark rm(THREAD);
5010 int newlen = c - (char*) signature;
5011 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5012 strncpy(sig, signature, newlen);
5013 sig[newlen] = '\0';
5014
5015 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5016 if (!legal) {
5017 classfile_parse_error("Class name contains illegal character "
5018 "in descriptor in class file %s",
5019 CHECK_0);
5020 return NULL;
5021 }
5022 return signature + newlen + 1;
5023 }
5024 }
5025 return NULL;
5026 }
5027 case JVM_SIGNATURE_ARRAY:
5028 array_dim++;
5029 if (array_dim > 255) {
5030 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5031 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5032 }
5033 // The rest of what's there better be a legal signature
5034 signature++;
5035 length--;
5036 void_ok = false;
5037 break;
5038 default:
5039 return NULL;
5040 }
5041 }
5042 return NULL;
5043 }
5044
5045 // Checks if name is a legal class name.
5046 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5047 if (!_need_verify || _relax_verify) { return; }
5048
5049 char buf[fixed_buffer_size];
5050 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5051 unsigned int length = name->utf8_length();
5052 bool legal = false;
5053
5054 if (length > 0) {
5055 const char* p;
5056 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5057 p = skip_over_field_signature(bytes, false, length, CHECK);
5058 legal = (p != NULL) && ((p - bytes) == (int)length);
5059 } else if (_major_version < JAVA_1_5_VERSION) {
5060 if (bytes[0] != '<') {
5061 p = skip_over_field_name(bytes, true, length);
5062 legal = (p != NULL) && ((p - bytes) == (int)length);
5063 }
5064 } else {
5065 // 4900761: relax the constraints based on JSR202 spec
5066 // Class names may be drawn from the entire Unicode character set.
5067 // Identifiers between '/' must be unqualified names.
5068 // The utf8 string has been verified when parsing cpool entries.
5069 legal = verify_unqualified_name(bytes, length, LegalClass);
5070 }
5071 }
5072 if (!legal) {
5073 ResourceMark rm(THREAD);
5074 assert(_class_name != NULL, "invariant");
5075 Exceptions::fthrow(
5076 THREAD_AND_LOCATION,
5077 vmSymbols::java_lang_ClassFormatError(),
5078 "Illegal class name \"%s\" in class file %s", bytes,
5079 _class_name->as_C_string()
5080 );
5081 return;
5082 }
5083 }
5084
5085 // Checks if name is a legal field name.
5086 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5087 if (!_need_verify || _relax_verify) { return; }
5088
5089 char buf[fixed_buffer_size];
5090 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5091 unsigned int length = name->utf8_length();
5092 bool legal = false;
5093
5094 if (length > 0) {
5095 if (_major_version < JAVA_1_5_VERSION) {
5096 if (bytes[0] != '<') {
5097 const char* p = skip_over_field_name(bytes, false, length);
5098 legal = (p != NULL) && ((p - bytes) == (int)length);
5099 }
5100 } else {
5101 // 4881221: relax the constraints based on JSR202 spec
5102 legal = verify_unqualified_name(bytes, length, LegalField);
5103 }
5104 }
5105
5106 if (!legal) {
5107 ResourceMark rm(THREAD);
5108 assert(_class_name != NULL, "invariant");
5109 Exceptions::fthrow(
5110 THREAD_AND_LOCATION,
5111 vmSymbols::java_lang_ClassFormatError(),
5112 "Illegal field name \"%s\" in class %s", bytes,
5113 _class_name->as_C_string()
5114 );
5115 return;
5116 }
5117 }
5118
5119 // Checks if name is a legal method name.
5120 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5121 if (!_need_verify || _relax_verify) { return; }
5122
5123 assert(name != NULL, "method name is null");
5124 char buf[fixed_buffer_size];
5125 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5126 unsigned int length = name->utf8_length();
5127 bool legal = false;
5128
5129 if (length > 0) {
5130 if (bytes[0] == '<') {
5131 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5132 legal = true;
5133 }
5134 } else if (_major_version < JAVA_1_5_VERSION) {
5135 const char* p;
5136 p = skip_over_field_name(bytes, false, length);
5137 legal = (p != NULL) && ((p - bytes) == (int)length);
5138 } else {
5139 // 4881221: relax the constraints based on JSR202 spec
5140 legal = verify_unqualified_name(bytes, length, LegalMethod);
5141 }
5142 }
5143
5144 if (!legal) {
5145 ResourceMark rm(THREAD);
5146 assert(_class_name != NULL, "invariant");
5147 Exceptions::fthrow(
5148 THREAD_AND_LOCATION,
5149 vmSymbols::java_lang_ClassFormatError(),
5150 "Illegal method name \"%s\" in class %s", bytes,
5151 _class_name->as_C_string()
5152 );
5153 return;
5154 }
5155 }
5156
5157
5158 // Checks if signature is a legal field signature.
5159 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5160 const Symbol* signature,
5161 TRAPS) const {
5162 if (!_need_verify) { return; }
5163
5164 char buf[fixed_buffer_size];
5165 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5166 const unsigned int length = signature->utf8_length();
5167 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5168
5169 if (p == NULL || (p - bytes) != (int)length) {
5170 throwIllegalSignature("Field", name, signature, CHECK);
5171 }
5172 }
5173
5174 // Checks if signature is a legal method signature.
5175 // Returns number of parameters
5176 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5177 const Symbol* signature,
5178 TRAPS) const {
5179 if (!_need_verify) {
5180 // make sure caller's args_size will be less than 0 even for non-static
5181 // method so it will be recomputed in compute_size_of_parameters().
5182 return -2;
5183 }
5184
5185 // Class initializers cannot have args for class format version >= 51.
5186 if (name == vmSymbols::class_initializer_name() &&
5187 signature != vmSymbols::void_method_signature() &&
5188 _major_version >= JAVA_7_VERSION) {
5189 throwIllegalSignature("Method", name, signature, CHECK_0);
5190 return 0;
5191 }
5192
5193 unsigned int args_size = 0;
5194 char buf[fixed_buffer_size];
5195 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5196 unsigned int length = signature->utf8_length();
5197 const char* nextp;
5198
5199 // The first character must be a '('
5200 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5201 length--;
5202 // Skip over legal field signatures
5203 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5204 while ((length > 0) && (nextp != NULL)) {
5205 args_size++;
5206 if (p[0] == 'J' || p[0] == 'D') {
5207 args_size++;
5208 }
5209 length -= nextp - p;
5210 p = nextp;
5211 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5212 }
5213 // The first non-signature thing better be a ')'
5214 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5215 length--;
5216 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5217 // All internal methods must return void
5218 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5219 return args_size;
5220 }
5221 } else {
5222 // Now we better just have a return value
5223 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5224 if (nextp && ((int)length == (nextp - p))) {
5225 return args_size;
5226 }
5227 }
5228 }
5229 }
5230 // Report error
5231 throwIllegalSignature("Method", name, signature, CHECK_0);
5232 return 0;
5233 }
5234
5235 int ClassFileParser::static_field_size() const {
5236 assert(_field_info != NULL, "invariant");
5237 return _field_info->static_field_size;
5238 }
5239
5240 int ClassFileParser::total_oop_map_count() const {
5241 assert(_field_info != NULL, "invariant");
5242 return _field_info->total_oop_map_count;
5243 }
5244
5245 jint ClassFileParser::layout_size() const {
5246 assert(_field_info != NULL, "invariant");
5247 return _field_info->instance_size;
5248 }
5249
5250 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5251 const Array<Method*>* methods) {
5252 assert(ik != NULL, "invariant");
5253 assert(methods != NULL, "invariant");
5254
5255 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5256 // (We used to do this lazily, but now we query it in Rewriter,
5257 // which is eagerly done for every method, so we might as well do it now,
5258 // when everything is fresh in memory.)
5259 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5260
5261 if (klass_id != vmSymbols::NO_SID) {
5262 for (int j = 0; j < methods->length(); ++j) {
5263 Method* method = methods->at(j);
5264 method->init_intrinsic_id();
5265
5266 if (CheckIntrinsics) {
5267 // Check if an intrinsic is defined for method 'method',
5268 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5269 if (method->intrinsic_id() != vmIntrinsics::_none &&
5270 !method->intrinsic_candidate()) {
5271 tty->print("Compiler intrinsic is defined for method [%s], "
5272 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5273 method->name_and_sig_as_C_string(),
5274 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5275 );
5276 tty->cr();
5277 DEBUG_ONLY(vm_exit(1));
5278 }
5279 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5280 // but there is no intrinsic available for it.
5281 if (method->intrinsic_candidate() &&
5282 method->intrinsic_id() == vmIntrinsics::_none) {
5283 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5284 "but no compiler intrinsic is defined for the method.%s",
5285 method->name_and_sig_as_C_string(),
5286 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5287 );
5288 tty->cr();
5289 DEBUG_ONLY(vm_exit(1));
5290 }
5291 }
5292 } // end for
5293
5294 #ifdef ASSERT
5295 if (CheckIntrinsics) {
5296 // Check for orphan methods in the current class. A method m
5297 // of a class C is orphan if an intrinsic is defined for method m,
5298 // but class C does not declare m.
5299 // The check is potentially expensive, therefore it is available
5300 // only in debug builds.
5301
5302 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5303 if (vmIntrinsics::_compiledLambdaForm == id) {
5304 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5305 // generated for the JVM from a LambdaForm and therefore no method
5306 // is defined for it.
5307 continue;
5308 }
5309
5310 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5311 // Check if the current class contains a method with the same
5312 // name, flags, signature.
5313 bool match = false;
5314 for (int j = 0; j < methods->length(); ++j) {
5315 const Method* method = methods->at(j);
5316 if (method->intrinsic_id() == id) {
5317 match = true;
5318 break;
5319 }
5320 }
5321
5322 if (!match) {
5323 char buf[1000];
5324 tty->print("Compiler intrinsic is defined for method [%s], "
5325 "but the method is not available in class [%s].%s",
5326 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5327 buf, sizeof(buf)),
5328 ik->name()->as_C_string(),
5329 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5330 );
5331 tty->cr();
5332 DEBUG_ONLY(vm_exit(1));
5333 }
5334 }
5335 } // end for
5336 } // CheckIntrinsics
5337 #endif // ASSERT
5338 }
5339 }
5340
5341 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5342 if (_klass != NULL) {
5343 return _klass;
5344 }
5345
5346 InstanceKlass* const ik =
5347 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5348
5349 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5350
5351 assert(_klass == ik, "invariant");
5352
5353 ik->set_has_passed_fingerprint_check(false);
5354 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5355 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5356 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5357 // This class matches with a class saved in an AOT library
5358 ik->set_has_passed_fingerprint_check(true);
5359 } else {
5360 ResourceMark rm;
5361 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5362 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5363 }
5364 }
5365
5366 return ik;
5367 }
5368
5369 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5370 assert(ik != NULL, "invariant");
5371
5372 // Set name and CLD before adding to CLD
5373 ik->set_class_loader_data(_loader_data);
5374 ik->set_name(_class_name);
5375
5376 // Add all classes to our internal class loader list here,
5377 // including classes in the bootstrap (NULL) class loader.
5378 const bool publicize = !is_internal();
5379
5380 _loader_data->add_class(ik, publicize);
5381
5382 set_klass_to_deallocate(ik);
5383
5384 assert(_field_info != NULL, "invariant");
5385 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5386 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5387 "sanity");
5388
5389 assert(ik->is_instance_klass(), "sanity");
5390 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5391
5392 // Fill in information already parsed
5393 ik->set_should_verify_class(_need_verify);
5394
5395 // Not yet: supers are done below to support the new subtype-checking fields
5396 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5397 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5398 assert(_fac != NULL, "invariant");
5399 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5400
5401 // this transfers ownership of a lot of arrays from
5402 // the parser onto the InstanceKlass*
5403 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5404
5405 // note that is not safe to use the fields in the parser from this point on
5406 assert(NULL == _cp, "invariant");
5407 assert(NULL == _fields, "invariant");
5408 assert(NULL == _methods, "invariant");
5409 assert(NULL == _inner_classes, "invariant");
5410 assert(NULL == _local_interfaces, "invariant");
5411 assert(NULL == _transitive_interfaces, "invariant");
5412 assert(NULL == _combined_annotations, "invariant");
5413
5414 if (_has_final_method) {
5415 ik->set_has_final_method();
5416 }
5417
5418 ik->copy_method_ordering(_method_ordering, CHECK);
5419 // The InstanceKlass::_methods_jmethod_ids cache
5420 // is managed on the assumption that the initial cache
5421 // size is equal to the number of methods in the class. If
5422 // that changes, then InstanceKlass::idnum_can_increment()
5423 // has to be changed accordingly.
5424 ik->set_initial_method_idnum(ik->methods()->length());
5425
5426 if (is_anonymous()) {
5427 // _this_class_index is a CONSTANT_Class entry that refers to this
5428 // anonymous class itself. If this class needs to refer to its own methods or
5429 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5430 // _this_class_index. However, because this class is anonymous (it's
5431 // not stored in SystemDictionary), _this_class_index cannot be resolved
5432 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5433 // Therefore, we must eagerly resolve _this_class_index now.
5434 ik->constants()->klass_at_put(_this_class_index, ik);
5435 }
5436
5437 ik->set_minor_version(_minor_version);
5438 ik->set_major_version(_major_version);
5439 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5440 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5441
5442 if (_host_klass != NULL) {
5443 assert (ik->is_anonymous(), "should be the same");
5444 ik->set_host_klass(_host_klass);
5445 }
5446
5447 // Set PackageEntry for this_klass
5448 oop cl = ik->class_loader();
5449 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5450 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5451 ik->set_package(cld, CHECK);
5452
5453 const Array<Method*>* const methods = ik->methods();
5454 assert(methods != NULL, "invariant");
5455 const int methods_len = methods->length();
5456
5457 check_methods_for_intrinsics(ik, methods);
5458
5459 // Fill in field values obtained by parse_classfile_attributes
5460 if (_parsed_annotations->has_any_annotations()) {
5461 _parsed_annotations->apply_to(ik);
5462 }
5463
5464 apply_parsed_class_attributes(ik);
5465
5466 // Miranda methods
5467 if ((_num_miranda_methods > 0) ||
5468 // if this class introduced new miranda methods or
5469 (_super_klass != NULL && _super_klass->has_miranda_methods())
5470 // super class exists and this class inherited miranda methods
5471 ) {
5472 ik->set_has_miranda_methods(); // then set a flag
5473 }
5474
5475 // Fill in information needed to compute superclasses.
5476 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5477
5478 // Initialize itable offset tables
5479 klassItable::setup_itable_offset_table(ik);
5480
5481 // Compute transitive closure of interfaces this class implements
5482 // Do final class setup
5483 fill_oop_maps(ik,
5484 _field_info->nonstatic_oop_map_count,
5485 _field_info->nonstatic_oop_offsets,
5486 _field_info->nonstatic_oop_counts);
5487
5488 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5489 set_precomputed_flags(ik);
5490
5491 // check if this class can access its super class
5492 check_super_class_access(ik, CHECK);
5493
5494 // check if this class can access its superinterfaces
5495 check_super_interface_access(ik, CHECK);
5496
5497 // check if this class overrides any final method
5498 check_final_method_override(ik, CHECK);
5499
5500 // reject static interface methods prior to Java 8
5501 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5502 check_illegal_static_method(ik, CHECK);
5503 }
5504
5505 // Obtain this_klass' module entry
5506 ModuleEntry* module_entry = ik->module();
5507 assert(module_entry != NULL, "module_entry should always be set");
5508
5509 // Obtain java.lang.Module
5510 Handle module_handle(THREAD, module_entry->module());
5511
5512 // Allocate mirror and initialize static fields
5513 // The create_mirror() call will also call compute_modifiers()
5514 java_lang_Class::create_mirror(ik,
5515 Handle(THREAD, _loader_data->class_loader()),
5516 module_handle,
5517 _protection_domain,
5518 CHECK);
5519
5520 assert(_all_mirandas != NULL, "invariant");
5521
5522 // Generate any default methods - default methods are public interface methods
5523 // that have a default implementation. This is new with Java 8.
5524 if (_has_nonstatic_concrete_methods) {
5525 DefaultMethods::generate_default_methods(ik,
5526 _all_mirandas,
5527 CHECK);
5528 }
5529
5530 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5531 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5532 !module_entry->has_default_read_edges()) {
5533 if (!module_entry->set_has_default_read_edges()) {
5534 // We won a potential race
5535 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5536 }
5537 }
5538
5539 // Update the loader_data graph.
5540 record_defined_class_dependencies(ik, CHECK);
5541
5542 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5543
5544 if (!is_internal()) {
5545 if (log_is_enabled(Info, class, load)) {
5546 ResourceMark rm;
5547 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5548 ik->print_class_load_logging(_loader_data, module_name, _stream);
5549 }
5550
5551 if (log_is_enabled(Debug, class, resolve)) {
5552 ResourceMark rm;
5553 // print out the superclass.
5554 const char * from = ik->external_name();
5555 if (ik->java_super() != NULL) {
5556 log_debug(class, resolve)("%s %s (super)",
5557 from,
5558 ik->java_super()->external_name());
5559 }
5560 // print out each of the interface classes referred to by this class.
5561 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5562 if (local_interfaces != NULL) {
5563 const int length = local_interfaces->length();
5564 for (int i = 0; i < length; i++) {
5565 const Klass* const k = local_interfaces->at(i);
5566 const char * to = k->external_name();
5567 log_debug(class, resolve)("%s %s (interface)", from, to);
5568 }
5569 }
5570 }
5571 }
5572
5573 TRACE_INIT_ID(ik);
5574
5575 // If we reach here, all is well.
5576 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5577 // in order for it to not be destroyed in the ClassFileParser destructor.
5578 set_klass_to_deallocate(NULL);
5579
5580 // it's official
5581 set_klass(ik);
5582
5583 debug_only(ik->verify();)
5584 }
5585
5586 // For an anonymous class that is in the unnamed package, move it to its host class's
5587 // package by prepending its host class's package name to its class name and setting
5588 // its _class_name field.
5589 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5590 ResourceMark rm(THREAD);
5591 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5592 "Anonymous class should not be in a package");
5593 const char* host_pkg_name =
5594 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5595
5596 if (host_pkg_name != NULL) {
5597 size_t host_pkg_len = strlen(host_pkg_name);
5598 int class_name_len = _class_name->utf8_length();
5599 char* new_anon_name =
5600 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5601 // Copy host package name and trailing /.
5602 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5603 new_anon_name[host_pkg_len] = '/';
5604 // Append anonymous class name. The anonymous class name can contain odd
5605 // characters. So, do a strncpy instead of using sprintf("%s...").
5606 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5607
5608 // Create a symbol and update the anonymous class name.
5609 _class_name = SymbolTable::new_symbol(new_anon_name,
5610 (int)host_pkg_len + 1 + class_name_len,
5611 CHECK);
5612 }
5613 }
5614
5615 // If the host class and the anonymous class are in the same package then do
5616 // nothing. If the anonymous class is in the unnamed package then move it to its
5617 // host's package. If the classes are in different packages then throw an IAE
5618 // exception.
5619 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5620 assert(_host_klass != NULL, "Expected an anonymous class");
5621
5622 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5623 _class_name->utf8_length(), '/');
5624 if (anon_last_slash == NULL) { // Unnamed package
5625 prepend_host_package_name(_host_klass, CHECK);
5626 } else {
5627 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5628 ResourceMark rm(THREAD);
5629 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5630 err_msg("Host class %s and anonymous class %s are in different packages",
5631 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5632 }
5633 }
5634 }
5635
5636 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5637 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5638 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5639 bool need_verify =
5640 // verifyAll
5641 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5642 // verifyRemote
5643 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5644 return !need_verify;
5645 }
5646
5647 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5648 Symbol* name,
5649 ClassLoaderData* loader_data,
5650 Handle protection_domain,
5651 const InstanceKlass* host_klass,
5652 GrowableArray<Handle>* cp_patches,
5653 Publicity pub_level,
5654 TRAPS) :
5655 _stream(stream),
5656 _requested_name(name),
5657 _loader_data(loader_data),
5658 _host_klass(host_klass),
5659 _cp_patches(cp_patches),
5660 _num_patched_klasses(0),
5661 _max_num_patched_klasses(0),
5662 _orig_cp_size(0),
5663 _first_patched_klass_resolved_index(0),
5664 _super_klass(),
5665 _cp(NULL),
5666 _fields(NULL),
5667 _methods(NULL),
5668 _inner_classes(NULL),
5669 _local_interfaces(NULL),
5670 _transitive_interfaces(NULL),
5671 _combined_annotations(NULL),
5672 _annotations(NULL),
5673 _type_annotations(NULL),
5674 _fields_annotations(NULL),
5675 _fields_type_annotations(NULL),
5676 _klass(NULL),
5677 _klass_to_deallocate(NULL),
5678 _parsed_annotations(NULL),
5679 _fac(NULL),
5680 _field_info(NULL),
5681 _method_ordering(NULL),
5682 _all_mirandas(NULL),
5683 _vtable_size(0),
5684 _itable_size(0),
5685 _num_miranda_methods(0),
5686 _rt(REF_NONE),
5687 _protection_domain(protection_domain),
5688 _access_flags(),
5689 _pub_level(pub_level),
5690 _bad_constant_seen(0),
5691 _synthetic_flag(false),
5692 _sde_length(false),
5693 _sde_buffer(NULL),
5694 _sourcefile_index(0),
5695 _generic_signature_index(0),
5696 _major_version(0),
5697 _minor_version(0),
5698 _this_class_index(0),
5699 _super_class_index(0),
5700 _itfs_len(0),
5701 _java_fields_count(0),
5702 _need_verify(false),
5703 _relax_verify(false),
5704 _has_nonstatic_concrete_methods(false),
5705 _declares_nonstatic_concrete_methods(false),
5706 _has_final_method(false),
5707 _has_finalizer(false),
5708 _has_empty_finalizer(false),
5709 _has_vanilla_constructor(false),
5710 _max_bootstrap_specifier_index(-1) {
5711
5712 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5713
5714 assert(THREAD->is_Java_thread(), "invariant");
5715 assert(_loader_data != NULL, "invariant");
5716 assert(stream != NULL, "invariant");
5717 assert(_stream != NULL, "invariant");
5718 assert(_stream->buffer() == _stream->current(), "invariant");
5719 assert(_class_name != NULL, "invariant");
5720 assert(0 == _access_flags.as_int(), "invariant");
5721
5722 // Figure out whether we can skip format checking (matching classic VM behavior)
5723 if (DumpSharedSpaces) {
5724 // verify == true means it's a 'remote' class (i.e., non-boot class)
5725 // Verification decision is based on BytecodeVerificationRemote flag
5726 // for those classes.
5727 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5728 BytecodeVerificationLocal;
5729 }
5730 else {
5731 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5732 stream->need_verify());
5733 }
5734 if (_cp_patches != NULL) {
5735 int len = _cp_patches->length();
5736 for (int i=0; i<len; i++) {
5737 if (has_cp_patch_at(i)) {
5738 Handle patch = cp_patch_at(i);
5739 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5740 // We need to append the names of the patched classes to the end of the constant pool,
5741 // because a patched class may have a Utf8 name that's not already included in the
5742 // original constant pool. These class names are used when patch_constant_pool()
5743 // calls patch_class().
5744 //
5745 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5746 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5747 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5748 _max_num_patched_klasses++;
5749 }
5750 }
5751 }
5752 }
5753
5754 // synch back verification state to stream
5755 stream->set_verify(_need_verify);
5756
5757 // Check if verification needs to be relaxed for this class file
5758 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5759 _relax_verify = relax_format_check_for(_loader_data);
5760
5761 parse_stream(stream, CHECK);
5762
5763 post_process_parsed_stream(stream, _cp, CHECK);
5764 }
5765
5766 void ClassFileParser::clear_class_metadata() {
5767 // metadata created before the instance klass is created. Must be
5768 // deallocated if classfile parsing returns an error.
5769 _cp = NULL;
5770 _fields = NULL;
5771 _methods = NULL;
5772 _inner_classes = NULL;
5773 _local_interfaces = NULL;
5774 _transitive_interfaces = NULL;
5775 _combined_annotations = NULL;
5776 _annotations = _type_annotations = NULL;
5777 _fields_annotations = _fields_type_annotations = NULL;
5778 }
5779
5780 // Destructor to clean up
5781 ClassFileParser::~ClassFileParser() {
5782 if (_cp != NULL) {
5783 MetadataFactory::free_metadata(_loader_data, _cp);
5784 }
5785 if (_fields != NULL) {
5786 MetadataFactory::free_array<u2>(_loader_data, _fields);
5787 }
5788
5789 if (_methods != NULL) {
5790 // Free methods
5791 InstanceKlass::deallocate_methods(_loader_data, _methods);
5792 }
5793
5794 // beware of the Universe::empty_blah_array!!
5795 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5796 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5797 }
5798
5799 // Free interfaces
5800 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5801 _local_interfaces, _transitive_interfaces);
5802
5803 if (_combined_annotations != NULL) {
5804 // After all annotations arrays have been created, they are installed into the
5805 // Annotations object that will be assigned to the InstanceKlass being created.
5806
5807 // Deallocate the Annotations object and the installed annotations arrays.
5808 _combined_annotations->deallocate_contents(_loader_data);
5809
5810 // If the _combined_annotations pointer is non-NULL,
5811 // then the other annotations fields should have been cleared.
5812 assert(_annotations == NULL, "Should have been cleared");
5813 assert(_type_annotations == NULL, "Should have been cleared");
5814 assert(_fields_annotations == NULL, "Should have been cleared");
5815 assert(_fields_type_annotations == NULL, "Should have been cleared");
5816 } else {
5817 // If the annotations arrays were not installed into the Annotations object,
5818 // then they have to be deallocated explicitly.
5819 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5820 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5821 Annotations::free_contents(_loader_data, _fields_annotations);
5822 Annotations::free_contents(_loader_data, _fields_type_annotations);
5823 }
5824
5825 clear_class_metadata();
5826
5827 // deallocate the klass if already created. Don't directly deallocate, but add
5828 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5829 // at a safepoint.
5830 if (_klass_to_deallocate != NULL) {
5831 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5832 }
5833 }
5834
5835 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5836 TRAPS) {
5837
5838 assert(stream != NULL, "invariant");
5839 assert(_class_name != NULL, "invariant");
5840
5841 // BEGIN STREAM PARSING
5842 stream->guarantee_more(8, CHECK); // magic, major, minor
5843 // Magic value
5844 const u4 magic = stream->get_u4_fast();
5845 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5846 "Incompatible magic value %u in class file %s",
5847 magic, CHECK);
5848
5849 // Version numbers
5850 _minor_version = stream->get_u2_fast();
5851 _major_version = stream->get_u2_fast();
5852
5853 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5854 ResourceMark rm;
5855 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5856 _major_version, _minor_version, _class_name->as_C_string());
5857 Exceptions::fthrow(
5858 THREAD_AND_LOCATION,
5859 vmSymbols::java_lang_UnsupportedClassVersionError(),
5860 "Unsupported major.minor version for dump time %u.%u",
5861 _major_version,
5862 _minor_version);
5863 }
5864
5865 // Check version numbers - we check this even with verifier off
5866 if (!is_supported_version(_major_version, _minor_version)) {
5867 ResourceMark rm(THREAD);
5868 Exceptions::fthrow(
5869 THREAD_AND_LOCATION,
5870 vmSymbols::java_lang_UnsupportedClassVersionError(),
5871 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5872 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5873 _class_name->as_C_string(),
5874 _major_version,
5875 _minor_version,
5876 JVM_CLASSFILE_MAJOR_VERSION,
5877 JVM_CLASSFILE_MINOR_VERSION);
5878 return;
5879 }
5880
5881 stream->guarantee_more(3, CHECK); // length, first cp tag
5882 u2 cp_size = stream->get_u2_fast();
5883
5884 guarantee_property(
5885 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5886 cp_size, CHECK);
5887
5888 _orig_cp_size = cp_size;
5889 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5890 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5891 }
5892 cp_size += _max_num_patched_klasses;
5893
5894 _cp = ConstantPool::allocate(_loader_data,
5895 cp_size,
5896 CHECK);
5897
5898 ConstantPool* const cp = _cp;
5899
5900 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5901
5902 assert(cp_size == (const u2)cp->length(), "invariant");
5903
5904 // ACCESS FLAGS
5905 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5906
5907 // Access flags
5908 jint flags;
5909 // JVM_ACC_MODULE is defined in JDK-9 and later.
5910 if (_major_version >= JAVA_9_VERSION) {
5911 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5912 } else {
5913 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5914 }
5915
5916 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5917 // Set abstract bit for old class files for backward compatibility
5918 flags |= JVM_ACC_ABSTRACT;
5919 }
5920
5921 verify_legal_class_modifiers(flags, CHECK);
5922
5923 short bad_constant = class_bad_constant_seen();
5924 if (bad_constant != 0) {
5925 // Do not throw CFE until after the access_flags are checked because if
5926 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5927 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5928 }
5929
5930 _access_flags.set_flags(flags);
5931
5932 // This class and superclass
5933 _this_class_index = stream->get_u2_fast();
5934 check_property(
5935 valid_cp_range(_this_class_index, cp_size) &&
5936 cp->tag_at(_this_class_index).is_unresolved_klass(),
5937 "Invalid this class index %u in constant pool in class file %s",
5938 _this_class_index, CHECK);
5939
5940 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5941 assert(class_name_in_cp != NULL, "class_name can't be null");
5942
5943 // Update _class_name which could be null previously
5944 // to reflect the name in the constant pool
5945 _class_name = class_name_in_cp;
5946
5947 // Don't need to check whether this class name is legal or not.
5948 // It has been checked when constant pool is parsed.
5949 // However, make sure it is not an array type.
5950 if (_need_verify) {
5951 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5952 "Bad class name in class file %s",
5953 CHECK);
5954 }
5955
5956 // Checks if name in class file matches requested name
5957 if (_requested_name != NULL && _requested_name != _class_name) {
5958 ResourceMark rm(THREAD);
5959 Exceptions::fthrow(
5960 THREAD_AND_LOCATION,
5961 vmSymbols::java_lang_NoClassDefFoundError(),
5962 "%s (wrong name: %s)",
5963 _class_name->as_C_string(),
5964 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
5965 );
5966 return;
5967 }
5968
5969 // if this is an anonymous class fix up its name if it's in the unnamed
5970 // package. Otherwise, throw IAE if it is in a different package than
5971 // its host class.
5972 if (_host_klass != NULL) {
5973 fix_anonymous_class_name(CHECK);
5974 }
5975
5976 // Verification prevents us from creating names with dots in them, this
5977 // asserts that that's the case.
5978 assert(is_internal_format(_class_name), "external class name format used internally");
5979
5980 if (!is_internal()) {
5981 LogTarget(Debug, class, preorder) lt;
5982 if (lt.is_enabled()){
5983 ResourceMark rm(THREAD);
5984 LogStream ls(lt);
5985 ls.print("%s", _class_name->as_klass_external_name());
5986 if (stream->source() != NULL) {
5987 ls.print(" source: %s", stream->source());
5988 }
5989 ls.cr();
5990 }
5991
5992 #if INCLUDE_CDS
5993 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
5994 if (!ClassLoader::has_jrt_entry()) {
5995 warning("DumpLoadedClassList and CDS are not supported in exploded build");
5996 DumpLoadedClassList = NULL;
5997 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
5998 _host_klass == NULL) {
5999 // Only dump the classes that can be stored into CDS archive.
6000 // Anonymous classes such as generated LambdaForm classes are also not included.
6001 oop class_loader = _loader_data->class_loader();
6002 ResourceMark rm(THREAD);
6003 bool skip = false;
6004 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6005 // For the boot and platform class loaders, skip classes that are not found in the
6006 // java runtime image, such as those found in the --patch-module entries.
6007 // These classes can't be loaded from the archive during runtime.
6008 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6009 skip = true;
6010 }
6011
6012 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6013 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6014 // as they can be loaded from the archive during runtime.
6015 skip = false;
6016 }
6017 }
6018 if (skip) {
6019 tty->print_cr("skip writing class %s from source %s to classlist file",
6020 _class_name->as_C_string(), stream->source());
6021 } else {
6022 classlist_file->print_cr("%s", _class_name->as_C_string());
6023 classlist_file->flush();
6024 }
6025 }
6026 }
6027 #endif
6028 }
6029
6030 // SUPERKLASS
6031 _super_class_index = stream->get_u2_fast();
6032 _super_klass = parse_super_class(cp,
6033 _super_class_index,
6034 _need_verify,
6035 CHECK);
6036
6037 // Interfaces
6038 _itfs_len = stream->get_u2_fast();
6039 parse_interfaces(stream,
6040 _itfs_len,
6041 cp,
6042 &_has_nonstatic_concrete_methods,
6043 CHECK);
6044
6045 assert(_local_interfaces != NULL, "invariant");
6046
6047 // Fields (offsets are filled in later)
6048 _fac = new FieldAllocationCount();
6049 parse_fields(stream,
6050 _access_flags.is_interface(),
6051 _fac,
6052 cp,
6053 cp_size,
6054 &_java_fields_count,
6055 CHECK);
6056
6057 assert(_fields != NULL, "invariant");
6058
6059 // Methods
6060 AccessFlags promoted_flags;
6061 parse_methods(stream,
6062 _access_flags.is_interface(),
6063 &promoted_flags,
6064 &_has_final_method,
6065 &_declares_nonstatic_concrete_methods,
6066 CHECK);
6067
6068 assert(_methods != NULL, "invariant");
6069
6070 // promote flags from parse_methods() to the klass' flags
6071 _access_flags.add_promoted_flags(promoted_flags.as_int());
6072
6073 if (_declares_nonstatic_concrete_methods) {
6074 _has_nonstatic_concrete_methods = true;
6075 }
6076
6077 // Additional attributes/annotations
6078 _parsed_annotations = new ClassAnnotationCollector();
6079 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6080
6081 assert(_inner_classes != NULL, "invariant");
6082
6083 // Finalize the Annotations metadata object,
6084 // now that all annotation arrays have been created.
6085 create_combined_annotations(CHECK);
6086
6087 // Make sure this is the end of class file stream
6088 guarantee_property(stream->at_eos(),
6089 "Extra bytes at the end of class file %s",
6090 CHECK);
6091
6092 // all bytes in stream read and parsed
6093 }
6094
6095 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6096 ConstantPool* cp,
6097 TRAPS) {
6098 assert(stream != NULL, "invariant");
6099 assert(stream->at_eos(), "invariant");
6100 assert(cp != NULL, "invariant");
6101 assert(_loader_data != NULL, "invariant");
6102
6103 if (_class_name == vmSymbols::java_lang_Object()) {
6104 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6105 "java.lang.Object cannot implement an interface in class file %s",
6106 CHECK);
6107 }
6108 // We check super class after class file is parsed and format is checked
6109 if (_super_class_index > 0 && NULL ==_super_klass) {
6110 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6111 if (_access_flags.is_interface()) {
6112 // Before attempting to resolve the superclass, check for class format
6113 // errors not checked yet.
6114 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6115 "Interfaces must have java.lang.Object as superclass in class file %s",
6116 CHECK);
6117 }
6118 Handle loader(THREAD, _loader_data->class_loader());
6119 _super_klass = (const InstanceKlass*)
6120 SystemDictionary::resolve_super_or_fail(_class_name,
6121 super_class_name,
6122 loader,
6123 _protection_domain,
6124 true,
6125 CHECK);
6126 }
6127
6128 if (_super_klass != NULL) {
6129 if (_super_klass->has_nonstatic_concrete_methods()) {
6130 _has_nonstatic_concrete_methods = true;
6131 }
6132
6133 if (_super_klass->is_interface()) {
6134 ResourceMark rm(THREAD);
6135 Exceptions::fthrow(
6136 THREAD_AND_LOCATION,
6137 vmSymbols::java_lang_IncompatibleClassChangeError(),
6138 "class %s has interface %s as super class",
6139 _class_name->as_klass_external_name(),
6140 _super_klass->external_name()
6141 );
6142 return;
6143 }
6144 // Make sure super class is not final
6145 if (_super_klass->is_final()) {
6146 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6147 }
6148 }
6149
6150 // Compute the transitive list of all unique interfaces implemented by this class
6151 _transitive_interfaces =
6152 compute_transitive_interfaces(_super_klass,
6153 _local_interfaces,
6154 _loader_data,
6155 CHECK);
6156
6157 assert(_transitive_interfaces != NULL, "invariant");
6158
6159 // sort methods
6160 _method_ordering = sort_methods(_methods);
6161
6162 _all_mirandas = new GrowableArray<Method*>(20);
6163
6164 Handle loader(THREAD, _loader_data->class_loader());
6165 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6166 &_num_miranda_methods,
6167 _all_mirandas,
6168 _super_klass,
6169 _methods,
6170 _access_flags,
6171 _major_version,
6172 loader,
6173 _class_name,
6174 _local_interfaces,
6175 CHECK);
6176
6177 // Size of Java itable (in words)
6178 _itable_size = _access_flags.is_interface() ? 0 :
6179 klassItable::compute_itable_size(_transitive_interfaces);
6180
6181 assert(_fac != NULL, "invariant");
6182 assert(_parsed_annotations != NULL, "invariant");
6183
6184 _field_info = new FieldLayoutInfo();
6185 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6186
6187 // Compute reference typ
6188 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6189
6190 }
6191
6192 void ClassFileParser::set_klass(InstanceKlass* klass) {
6193
6194 #ifdef ASSERT
6195 if (klass != NULL) {
6196 assert(NULL == _klass, "leaking?");
6197 }
6198 #endif
6199
6200 _klass = klass;
6201 }
6202
6203 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6204
6205 #ifdef ASSERT
6206 if (klass != NULL) {
6207 assert(NULL == _klass_to_deallocate, "leaking?");
6208 }
6209 #endif
6210
6211 _klass_to_deallocate = klass;
6212 }
6213
6214 // Caller responsible for ResourceMark
6215 // clone stream with rewound position
6216 const ClassFileStream* ClassFileParser::clone_stream() const {
6217 assert(_stream != NULL, "invariant");
6218
6219 return _stream->clone();
6220 }
6221 // ----------------------------------------------------------------------------
6222 // debugging
6223
6224 #ifdef ASSERT
6225
6226 // return true if class_name contains no '.' (internal format is '/')
6227 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6228 if (class_name != NULL) {
6229 ResourceMark rm;
6230 char* name = class_name->as_C_string();
6231 return strchr(name, '.') == NULL;
6232 } else {
6233 return true;
6234 }
6235 }
6236
6237 #endif