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 "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/annotations.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "runtime/arguments.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/safepointVerifiers.hpp"
66 #include "runtime/signature.hpp"
67 #include "runtime/timer.hpp"
68 #include "services/classLoadingService.hpp"
69 #include "services/threadService.hpp"
70 #include "trace/traceMacros.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/bitMap.inline.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/exceptions.hpp"
75 #include "utilities/globalDefinitions.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/ostream.hpp"
79 #include "utilities/resourceHash.hpp"
80 #if INCLUDE_CDS
81 #include "classfile/systemDictionaryShared.hpp"
82 #endif
83
84 // We generally try to create the oops directly when parsing, rather than
85 // allocating temporary data structures and copying the bytes twice. A
86 // temporary area is only needed when parsing utf8 entries in the constant
87 // pool and when parsing line number tables.
88
89 // We add assert in debug mode when class format is not checked.
90
91 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
92 #define JAVA_MIN_SUPPORTED_VERSION 45
93 #define JAVA_PREVIEW_MINOR_VERSION 65535
94
95 // Used for two backward compatibility reasons:
96 // - to check for new additions to the class file format in JDK1.5
97 // - to check for bug fixes in the format checker in JDK1.5
98 #define JAVA_1_5_VERSION 49
99
100 // Used for backward compatibility reasons:
101 // - to check for javac bug fixes that happened after 1.5
102 // - also used as the max version when running in jdk6
103 #define JAVA_6_VERSION 50
104
105 // Used for backward compatibility reasons:
106 // - to disallow argument and require ACC_STATIC for <clinit> methods
107 #define JAVA_7_VERSION 51
108
109 // Extension method support.
110 #define JAVA_8_VERSION 52
111
112 #define JAVA_9_VERSION 53
113
114 #define JAVA_10_VERSION 54
115
116 #define JAVA_11_VERSION 55
117
118 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
119 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
120 "Unexpected bad constant pool entry");
121 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
122 }
123
124 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
125 ConstantPool* cp,
126 const int length,
127 TRAPS) {
128 assert(stream != NULL, "invariant");
129 assert(cp != NULL, "invariant");
130
131 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
132 // this function (_current can be allocated in a register, with scalar
133 // replacement of aggregates). The _current pointer is copied back to
134 // stream() when this function returns. DON'T call another method within
135 // this method that uses stream().
136 const ClassFileStream cfs1 = *stream;
137 const ClassFileStream* const cfs = &cfs1;
138
139 assert(cfs->allocated_on_stack(), "should be local");
140 debug_only(const u1* const old_current = stream->current();)
141
142 // Used for batching symbol allocations.
143 const char* names[SymbolTable::symbol_alloc_batch_size];
144 int lengths[SymbolTable::symbol_alloc_batch_size];
145 int indices[SymbolTable::symbol_alloc_batch_size];
146 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
147 int names_count = 0;
148
149 // parsing Index 0 is unused
150 for (int index = 1; index < length; index++) {
151 // Each of the following case guarantees one more byte in the stream
152 // for the following tag or the access_flags following constant pool,
153 // so we don't need bounds-check for reading tag.
154 const u1 tag = cfs->get_u1_fast();
155 switch (tag) {
156 case JVM_CONSTANT_Class : {
157 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
158 const u2 name_index = cfs->get_u2_fast();
159 cp->klass_index_at_put(index, name_index);
160 break;
161 }
162 case JVM_CONSTANT_Fieldref: {
163 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
164 const u2 class_index = cfs->get_u2_fast();
165 const u2 name_and_type_index = cfs->get_u2_fast();
166 cp->field_at_put(index, class_index, name_and_type_index);
167 break;
168 }
169 case JVM_CONSTANT_Methodref: {
170 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
171 const u2 class_index = cfs->get_u2_fast();
172 const u2 name_and_type_index = cfs->get_u2_fast();
173 cp->method_at_put(index, class_index, name_and_type_index);
174 break;
175 }
176 case JVM_CONSTANT_InterfaceMethodref: {
177 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
178 const u2 class_index = cfs->get_u2_fast();
179 const u2 name_and_type_index = cfs->get_u2_fast();
180 cp->interface_method_at_put(index, class_index, name_and_type_index);
181 break;
182 }
183 case JVM_CONSTANT_String : {
184 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
185 const u2 string_index = cfs->get_u2_fast();
186 cp->string_index_at_put(index, string_index);
187 break;
188 }
189 case JVM_CONSTANT_MethodHandle :
190 case JVM_CONSTANT_MethodType: {
191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
192 classfile_parse_error(
193 "Class file version does not support constant tag %u in class file %s",
194 tag, CHECK);
195 }
196 if (tag == JVM_CONSTANT_MethodHandle) {
197 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
198 const u1 ref_kind = cfs->get_u1_fast();
199 const u2 method_index = cfs->get_u2_fast();
200 cp->method_handle_index_at_put(index, ref_kind, method_index);
201 }
202 else if (tag == JVM_CONSTANT_MethodType) {
203 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
204 const u2 signature_index = cfs->get_u2_fast();
205 cp->method_type_index_at_put(index, signature_index);
206 }
207 else {
208 ShouldNotReachHere();
209 }
210 break;
211 }
212 case JVM_CONSTANT_Dynamic : {
213 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
214 classfile_parse_error(
215 "Class file version does not support constant tag %u in class file %s",
216 tag, CHECK);
217 }
218 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
219 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
220 const u2 name_and_type_index = cfs->get_u2_fast();
221 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
222 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
223 }
224 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
225 break;
226 }
227 case JVM_CONSTANT_InvokeDynamic : {
228 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
229 classfile_parse_error(
230 "Class file version does not support constant tag %u in class file %s",
231 tag, CHECK);
232 }
233 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
234 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
235 const u2 name_and_type_index = cfs->get_u2_fast();
236 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
237 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
238 }
239 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
240 break;
241 }
242 case JVM_CONSTANT_Integer: {
243 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
244 const u4 bytes = cfs->get_u4_fast();
245 cp->int_at_put(index, (jint)bytes);
246 break;
247 }
248 case JVM_CONSTANT_Float: {
249 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
250 const u4 bytes = cfs->get_u4_fast();
251 cp->float_at_put(index, *(jfloat*)&bytes);
252 break;
253 }
254 case JVM_CONSTANT_Long: {
255 // A mangled type might cause you to overrun allocated memory
256 guarantee_property(index + 1 < length,
257 "Invalid constant pool entry %u in class file %s",
258 index,
259 CHECK);
260 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
261 const u8 bytes = cfs->get_u8_fast();
262 cp->long_at_put(index, bytes);
263 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
264 break;
265 }
266 case JVM_CONSTANT_Double: {
267 // A mangled type might cause you to overrun allocated memory
268 guarantee_property(index+1 < length,
269 "Invalid constant pool entry %u in class file %s",
270 index,
271 CHECK);
272 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
273 const u8 bytes = cfs->get_u8_fast();
274 cp->double_at_put(index, *(jdouble*)&bytes);
275 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
276 break;
277 }
278 case JVM_CONSTANT_NameAndType: {
279 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
280 const u2 name_index = cfs->get_u2_fast();
281 const u2 signature_index = cfs->get_u2_fast();
282 cp->name_and_type_at_put(index, name_index, signature_index);
283 break;
284 }
285 case JVM_CONSTANT_Utf8 : {
286 cfs->guarantee_more(2, CHECK); // utf8_length
287 u2 utf8_length = cfs->get_u2_fast();
288 const u1* utf8_buffer = cfs->current();
289 assert(utf8_buffer != NULL, "null utf8 buffer");
290 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
291 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
292 cfs->skip_u1_fast(utf8_length);
293
294 // Before storing the symbol, make sure it's legal
295 if (_need_verify) {
296 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
297 }
298
299 if (has_cp_patch_at(index)) {
300 Handle patch = clear_cp_patch_at(index);
301 guarantee_property(java_lang_String::is_instance(patch()),
302 "Illegal utf8 patch at %d in class file %s",
303 index,
304 CHECK);
305 const char* const str = java_lang_String::as_utf8_string(patch());
306 // (could use java_lang_String::as_symbol instead, but might as well batch them)
307 utf8_buffer = (const u1*) str;
308 utf8_length = (int) strlen(str);
309 }
310
311 unsigned int hash;
312 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
313 utf8_length,
314 hash);
315 if (result == NULL) {
316 names[names_count] = (const char*)utf8_buffer;
317 lengths[names_count] = utf8_length;
318 indices[names_count] = index;
319 hashValues[names_count++] = hash;
320 if (names_count == SymbolTable::symbol_alloc_batch_size) {
321 SymbolTable::new_symbols(_loader_data,
322 cp,
323 names_count,
324 names,
325 lengths,
326 indices,
327 hashValues,
328 CHECK);
329 names_count = 0;
330 }
331 } else {
332 cp->symbol_at_put(index, result);
333 }
334 break;
335 }
336 case 19:
337 case 20: {
338 // Record that an error occurred in these two cases but keep parsing so
339 // that ACC_Module can be checked for in the access_flags. Need to
340 // throw NoClassDefFoundError in that case.
341 if (_major_version >= JAVA_9_VERSION) {
342 cfs->guarantee_more(3, CHECK);
343 cfs->get_u2_fast();
344 set_class_bad_constant_seen(tag);
345 break;
346 }
347 }
348 default: {
349 classfile_parse_error("Unknown constant tag %u in class file %s",
350 tag,
351 CHECK);
352 break;
353 }
354 } // end of switch(tag)
355 } // end of for
356
357 // Allocate the remaining symbols
358 if (names_count > 0) {
359 SymbolTable::new_symbols(_loader_data,
360 cp,
361 names_count,
362 names,
363 lengths,
364 indices,
365 hashValues,
366 CHECK);
367 }
368
369 // Copy _current pointer of local copy back to stream.
370 assert(stream->current() == old_current, "non-exclusive use of stream");
371 stream->set_current(cfs1.current());
372
373 }
374
375 static inline bool valid_cp_range(int index, int length) {
376 return (index > 0 && index < length);
377 }
378
379 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
380 assert(cp != NULL, "invariant");
381 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
382 return cp->symbol_at(index);
383 }
384 return NULL;
385 }
386
387 #ifdef ASSERT
388 PRAGMA_DIAG_PUSH
389 PRAGMA_FORMAT_NONLITERAL_IGNORED
390 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
391 ResourceMark rm(THREAD);
392 fatal(msg, _class_name->as_C_string());
393 }
394
395 void ClassFileParser::report_assert_property_failure(const char* msg,
396 int index,
397 TRAPS) const {
398 ResourceMark rm(THREAD);
399 fatal(msg, index, _class_name->as_C_string());
400 }
401 PRAGMA_DIAG_POP
402 #endif
403
404 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
405 ConstantPool* const cp,
406 const int length,
407 TRAPS) {
408 assert(cp != NULL, "invariant");
409 assert(stream != NULL, "invariant");
410
411 // parsing constant pool entries
412 parse_constant_pool_entries(stream, cp, length, CHECK);
413 if (class_bad_constant_seen() != 0) {
414 // a bad CP entry has been detected previously so stop parsing and just return.
415 return;
416 }
417
418 int index = 1; // declared outside of loops for portability
419 int num_klasses = 0;
420
421 // first verification pass - validate cross references
422 // and fixup class and string constants
423 for (index = 1; index < length; index++) { // Index 0 is unused
424 const jbyte tag = cp->tag_at(index).value();
425 switch (tag) {
426 case JVM_CONSTANT_Class: {
427 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
428 break;
429 }
430 case JVM_CONSTANT_Fieldref:
431 // fall through
432 case JVM_CONSTANT_Methodref:
433 // fall through
434 case JVM_CONSTANT_InterfaceMethodref: {
435 if (!_need_verify) break;
436 const int klass_ref_index = cp->klass_ref_index_at(index);
437 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
438 check_property(valid_klass_reference_at(klass_ref_index),
439 "Invalid constant pool index %u in class file %s",
440 klass_ref_index, CHECK);
441 check_property(valid_cp_range(name_and_type_ref_index, length) &&
442 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
443 "Invalid constant pool index %u in class file %s",
444 name_and_type_ref_index, CHECK);
445 break;
446 }
447 case JVM_CONSTANT_String: {
448 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
449 break;
450 }
451 case JVM_CONSTANT_Integer:
452 break;
453 case JVM_CONSTANT_Float:
454 break;
455 case JVM_CONSTANT_Long:
456 case JVM_CONSTANT_Double: {
457 index++;
458 check_property(
459 (index < length && cp->tag_at(index).is_invalid()),
460 "Improper constant pool long/double index %u in class file %s",
461 index, CHECK);
462 break;
463 }
464 case JVM_CONSTANT_NameAndType: {
465 if (!_need_verify) break;
466 const int name_ref_index = cp->name_ref_index_at(index);
467 const int signature_ref_index = cp->signature_ref_index_at(index);
468 check_property(valid_symbol_at(name_ref_index),
469 "Invalid constant pool index %u in class file %s",
470 name_ref_index, CHECK);
471 check_property(valid_symbol_at(signature_ref_index),
472 "Invalid constant pool index %u in class file %s",
473 signature_ref_index, CHECK);
474 break;
475 }
476 case JVM_CONSTANT_Utf8:
477 break;
478 case JVM_CONSTANT_UnresolvedClass: // fall-through
479 case JVM_CONSTANT_UnresolvedClassInError: {
480 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
481 break;
482 }
483 case JVM_CONSTANT_ClassIndex: {
484 const int class_index = cp->klass_index_at(index);
485 check_property(valid_symbol_at(class_index),
486 "Invalid constant pool index %u in class file %s",
487 class_index, CHECK);
488 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
489 break;
490 }
491 case JVM_CONSTANT_StringIndex: {
492 const int string_index = cp->string_index_at(index);
493 check_property(valid_symbol_at(string_index),
494 "Invalid constant pool index %u in class file %s",
495 string_index, CHECK);
496 Symbol* const sym = cp->symbol_at(string_index);
497 cp->unresolved_string_at_put(index, sym);
498 break;
499 }
500 case JVM_CONSTANT_MethodHandle: {
501 const int ref_index = cp->method_handle_index_at(index);
502 check_property(valid_cp_range(ref_index, length),
503 "Invalid constant pool index %u in class file %s",
504 ref_index, CHECK);
505 const constantTag tag = cp->tag_at(ref_index);
506 const int ref_kind = cp->method_handle_ref_kind_at(index);
507
508 switch (ref_kind) {
509 case JVM_REF_getField:
510 case JVM_REF_getStatic:
511 case JVM_REF_putField:
512 case JVM_REF_putStatic: {
513 check_property(
514 tag.is_field(),
515 "Invalid constant pool index %u in class file %s (not a field)",
516 ref_index, CHECK);
517 break;
518 }
519 case JVM_REF_invokeVirtual:
520 case JVM_REF_newInvokeSpecial: {
521 check_property(
522 tag.is_method(),
523 "Invalid constant pool index %u in class file %s (not a method)",
524 ref_index, CHECK);
525 break;
526 }
527 case JVM_REF_invokeStatic:
528 case JVM_REF_invokeSpecial: {
529 check_property(
530 tag.is_method() ||
531 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
532 "Invalid constant pool index %u in class file %s (not a method)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeInterface: {
537 check_property(
538 tag.is_interface_method(),
539 "Invalid constant pool index %u in class file %s (not an interface method)",
540 ref_index, CHECK);
541 break;
542 }
543 default: {
544 classfile_parse_error(
545 "Bad method handle kind at constant pool index %u in class file %s",
546 index, CHECK);
547 }
548 } // switch(refkind)
549 // Keep the ref_index unchanged. It will be indirected at link-time.
550 break;
551 } // case MethodHandle
552 case JVM_CONSTANT_MethodType: {
553 const int ref_index = cp->method_type_index_at(index);
554 check_property(valid_symbol_at(ref_index),
555 "Invalid constant pool index %u in class file %s",
556 ref_index, CHECK);
557 break;
558 }
559 case JVM_CONSTANT_Dynamic: {
560 const int name_and_type_ref_index =
561 cp->invoke_dynamic_name_and_type_ref_index_at(index);
562
563 check_property(valid_cp_range(name_and_type_ref_index, length) &&
564 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
565 "Invalid constant pool index %u in class file %s",
566 name_and_type_ref_index, CHECK);
567 // bootstrap specifier index must be checked later,
568 // when BootstrapMethods attr is available
569
570 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
571 cp->set_has_dynamic_constant();
572 break;
573 }
574 case JVM_CONSTANT_InvokeDynamic: {
575 const int name_and_type_ref_index =
576 cp->invoke_dynamic_name_and_type_ref_index_at(index);
577
578 check_property(valid_cp_range(name_and_type_ref_index, length) &&
579 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
580 "Invalid constant pool index %u in class file %s",
581 name_and_type_ref_index, CHECK);
582 // bootstrap specifier index must be checked later,
583 // when BootstrapMethods attr is available
584 break;
585 }
586 default: {
587 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
588 ShouldNotReachHere();
589 break;
590 }
591 } // switch(tag)
592 } // end of for
593
594 _first_patched_klass_resolved_index = num_klasses;
595 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
596
597 if (_cp_patches != NULL) {
598 // need to treat this_class specially...
599
600 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
601 // for now. These will be replaced with actual names of the patched classes in patch_class().
602 Symbol* s = vmSymbols::star_name();
603 for (int n=_orig_cp_size; n<cp->length(); n++) {
604 cp->symbol_at_put(n, s);
605 }
606
607 int this_class_index;
608 {
609 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
610 const u1* const mark = stream->current();
611 stream->skip_u2_fast(1); // skip flags
612 this_class_index = stream->get_u2_fast();
613 stream->set_current(mark); // revert to mark
614 }
615
616 for (index = 1; index < length; index++) { // Index 0 is unused
617 if (has_cp_patch_at(index)) {
618 guarantee_property(index != this_class_index,
619 "Illegal constant pool patch to self at %d in class file %s",
620 index, CHECK);
621 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
622 }
623 }
624 }
625
626 if (!_need_verify) {
627 return;
628 }
629
630 // second verification pass - checks the strings are of the right format.
631 // but not yet to the other entries
632 for (index = 1; index < length; index++) {
633 const jbyte tag = cp->tag_at(index).value();
634 switch (tag) {
635 case JVM_CONSTANT_UnresolvedClass: {
636 const Symbol* const class_name = cp->klass_name_at(index);
637 // check the name, even if _cp_patches will overwrite it
638 verify_legal_class_name(class_name, CHECK);
639 break;
640 }
641 case JVM_CONSTANT_NameAndType: {
642 if (_need_verify) {
643 const int sig_index = cp->signature_ref_index_at(index);
644 const int name_index = cp->name_ref_index_at(index);
645 const Symbol* const name = cp->symbol_at(name_index);
646 const Symbol* const sig = cp->symbol_at(sig_index);
647 guarantee_property(sig->utf8_length() != 0,
648 "Illegal zero length constant pool entry at %d in class %s",
649 sig_index, CHECK);
650 guarantee_property(name->utf8_length() != 0,
651 "Illegal zero length constant pool entry at %d in class %s",
652 name_index, CHECK);
653
654 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
655 // Format check method name and signature
656 verify_legal_method_name(name, CHECK);
657 verify_legal_method_signature(name, sig, CHECK);
658 } else {
659 // Format check field name and signature
660 verify_legal_field_name(name, CHECK);
661 verify_legal_field_signature(name, sig, CHECK);
662 }
663 }
664 break;
665 }
666 case JVM_CONSTANT_Dynamic: {
667 const int name_and_type_ref_index =
668 cp->name_and_type_ref_index_at(index);
669 // already verified to be utf8
670 const int name_ref_index =
671 cp->name_ref_index_at(name_and_type_ref_index);
672 // already verified to be utf8
673 const int signature_ref_index =
674 cp->signature_ref_index_at(name_and_type_ref_index);
675 const Symbol* const name = cp->symbol_at(name_ref_index);
676 const Symbol* const signature = cp->symbol_at(signature_ref_index);
677 if (_need_verify) {
678 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
679 // Need only to be sure signature is non-zero length and the right type.
680 if (signature->utf8_length() == 0 ||
681 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
682 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
683 }
684 }
685 break;
686 }
687 case JVM_CONSTANT_InvokeDynamic:
688 case JVM_CONSTANT_Fieldref:
689 case JVM_CONSTANT_Methodref:
690 case JVM_CONSTANT_InterfaceMethodref: {
691 const int name_and_type_ref_index =
692 cp->name_and_type_ref_index_at(index);
693 // already verified to be utf8
694 const int name_ref_index =
695 cp->name_ref_index_at(name_and_type_ref_index);
696 // already verified to be utf8
697 const int signature_ref_index =
698 cp->signature_ref_index_at(name_and_type_ref_index);
699 const Symbol* const name = cp->symbol_at(name_ref_index);
700 const Symbol* const signature = cp->symbol_at(signature_ref_index);
701 if (tag == JVM_CONSTANT_Fieldref) {
702 if (_need_verify) {
703 // Field name and signature are verified above, when iterating NameAndType_info.
704 // Need only to be sure signature is non-zero length and the right type.
705 if (signature->utf8_length() == 0 ||
706 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
707 throwIllegalSignature("Field", name, signature, CHECK);
708 }
709 }
710 } else {
711 if (_need_verify) {
712 // Method name and signature are verified above, when iterating NameAndType_info.
713 // Need only to be sure signature is non-zero length and the right type.
714 if (signature->utf8_length() == 0 ||
715 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
716 throwIllegalSignature("Method", name, signature, CHECK);
717 }
718 }
719 // 4509014: If a class method name begins with '<', it must be "<init>"
720 const unsigned int name_len = name->utf8_length();
721 if (tag == JVM_CONSTANT_Methodref &&
722 name_len != 0 &&
723 name->byte_at(0) == '<' &&
724 name != vmSymbols::object_initializer_name()) {
725 classfile_parse_error(
726 "Bad method name at constant pool index %u in class file %s",
727 name_ref_index, CHECK);
728 }
729 }
730 break;
731 }
732 case JVM_CONSTANT_MethodHandle: {
733 const int ref_index = cp->method_handle_index_at(index);
734 const int ref_kind = cp->method_handle_ref_kind_at(index);
735 switch (ref_kind) {
736 case JVM_REF_invokeVirtual:
737 case JVM_REF_invokeStatic:
738 case JVM_REF_invokeSpecial:
739 case JVM_REF_newInvokeSpecial: {
740 const int name_and_type_ref_index =
741 cp->name_and_type_ref_index_at(ref_index);
742 const int name_ref_index =
743 cp->name_ref_index_at(name_and_type_ref_index);
744 const Symbol* const name = cp->symbol_at(name_ref_index);
745 if (ref_kind == JVM_REF_newInvokeSpecial) {
746 if (name != vmSymbols::object_initializer_name()) {
747 classfile_parse_error(
748 "Bad constructor name at constant pool index %u in class file %s",
749 name_ref_index, CHECK);
750 }
751 } else {
752 if (name == vmSymbols::object_initializer_name()) {
753 classfile_parse_error(
754 "Bad method name at constant pool index %u in class file %s",
755 name_ref_index, CHECK);
756 }
757 }
758 break;
759 }
760 // Other ref_kinds are already fully checked in previous pass.
761 } // switch(ref_kind)
762 break;
763 }
764 case JVM_CONSTANT_MethodType: {
765 const Symbol* const no_name = vmSymbols::type_name(); // place holder
766 const Symbol* const signature = cp->method_type_signature_at(index);
767 verify_legal_method_signature(no_name, signature, CHECK);
768 break;
769 }
770 case JVM_CONSTANT_Utf8: {
771 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
772 }
773 } // switch(tag)
774 } // end of for
775 }
776
777 Handle ClassFileParser::clear_cp_patch_at(int index) {
778 Handle patch = cp_patch_at(index);
779 _cp_patches->at_put(index, Handle());
780 assert(!has_cp_patch_at(index), "");
781 return patch;
782 }
783
784 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
785 int name_index = _orig_cp_size + _num_patched_klasses;
786 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
787
788 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
789 _num_patched_klasses ++;
790 }
791
792 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
793 int index,
794 Handle patch,
795 TRAPS) {
796 assert(cp != NULL, "invariant");
797
798 BasicType patch_type = T_VOID;
799
800 switch (cp->tag_at(index).value()) {
801
802 case JVM_CONSTANT_UnresolvedClass: {
803 // Patching a class means pre-resolving it.
804 // The name in the constant pool is ignored.
805 if (java_lang_Class::is_instance(patch())) {
806 guarantee_property(!java_lang_Class::is_primitive(patch()),
807 "Illegal class patch at %d in class file %s",
808 index, CHECK);
809 Klass* k = java_lang_Class::as_Klass(patch());
810 patch_class(cp, index, k, k->name());
811 } else {
812 guarantee_property(java_lang_String::is_instance(patch()),
813 "Illegal class patch at %d in class file %s",
814 index, CHECK);
815 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
816 patch_class(cp, index, NULL, name);
817 }
818 break;
819 }
820
821 case JVM_CONSTANT_String: {
822 // skip this patch and don't clear it. Needs the oop array for resolved
823 // references to be created first.
824 return;
825 }
826 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
827 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
828 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
829 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
830 patch_prim:
831 {
832 jvalue value;
833 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
834 guarantee_property(value_type == patch_type,
835 "Illegal primitive patch at %d in class file %s",
836 index, CHECK);
837 switch (value_type) {
838 case T_INT: cp->int_at_put(index, value.i); break;
839 case T_FLOAT: cp->float_at_put(index, value.f); break;
840 case T_LONG: cp->long_at_put(index, value.j); break;
841 case T_DOUBLE: cp->double_at_put(index, value.d); break;
842 default: assert(false, "");
843 }
844 } // end patch_prim label
845 break;
846
847 default: {
848 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
849 guarantee_property(!has_cp_patch_at(index),
850 "Illegal unexpected patch at %d in class file %s",
851 index, CHECK);
852 return;
853 }
854 } // end of switch(tag)
855
856 // On fall-through, mark the patch as used.
857 clear_cp_patch_at(index);
858 }
859 class NameSigHash: public ResourceObj {
860 public:
861 const Symbol* _name; // name
862 const Symbol* _sig; // signature
863 NameSigHash* _next; // Next entry in hash table
864 };
865
866 static const int HASH_ROW_SIZE = 256;
867
868 static unsigned int hash(const Symbol* name, const Symbol* sig) {
869 unsigned int raw_hash = 0;
870 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
871 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
872
873 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
874 }
875
876
877 static void initialize_hashtable(NameSigHash** table) {
878 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
879 }
880 // Return false if the name/sig combination is found in table.
881 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
882 // The old format checker uses heap sort to find duplicates.
883 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
884 // of table since we don't expect Symbol*'s to move.
885 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
886 assert(name != NULL, "name in constant pool is NULL");
887
888 // First lookup for duplicates
889 int index = hash(name, sig);
890 NameSigHash* entry = table[index];
891 while (entry != NULL) {
892 if (entry->_name == name && entry->_sig == sig) {
893 return false;
894 }
895 entry = entry->_next;
896 }
897
898 // No duplicate is found, allocate a new entry and fill it.
899 entry = new NameSigHash();
900 entry->_name = name;
901 entry->_sig = sig;
902
903 // Insert into hash table
904 entry->_next = table[index];
905 table[index] = entry;
906
907 return true;
908 }
909
910 // Side-effects: populates the _local_interfaces field
911 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
912 const int itfs_len,
913 ConstantPool* const cp,
914 bool* const has_nonstatic_concrete_methods,
915 TRAPS) {
916 assert(stream != NULL, "invariant");
917 assert(cp != NULL, "invariant");
918 assert(has_nonstatic_concrete_methods != NULL, "invariant");
919
920 if (itfs_len == 0) {
921 _local_interfaces = Universe::the_empty_klass_array();
922 } else {
923 assert(itfs_len > 0, "only called for len>0");
924 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
925
926 int index;
927 for (index = 0; index < itfs_len; index++) {
928 const u2 interface_index = stream->get_u2(CHECK);
929 Klass* interf;
930 check_property(
931 valid_klass_reference_at(interface_index),
932 "Interface name has bad constant pool index %u in class file %s",
933 interface_index, CHECK);
934 if (cp->tag_at(interface_index).is_klass()) {
935 interf = cp->resolved_klass_at(interface_index);
936 } else {
937 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
938
939 // Don't need to check legal name because it's checked when parsing constant pool.
940 // But need to make sure it's not an array type.
941 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
942 "Bad interface name in class file %s", CHECK);
943
944 // Call resolve_super so classcircularity is checked
945 interf = SystemDictionary::resolve_super_or_fail(
946 _class_name,
947 unresolved_klass,
948 Handle(THREAD, _loader_data->class_loader()),
949 _protection_domain,
950 false,
951 CHECK);
952 }
953
954 if (!interf->is_interface()) {
955 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
956 "Implementing class");
957 }
958
959 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
960 *has_nonstatic_concrete_methods = true;
961 }
962 _local_interfaces->at_put(index, interf);
963 }
964
965 if (!_need_verify || itfs_len <= 1) {
966 return;
967 }
968
969 // Check if there's any duplicates in interfaces
970 ResourceMark rm(THREAD);
971 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
972 NameSigHash*,
973 HASH_ROW_SIZE);
974 initialize_hashtable(interface_names);
975 bool dup = false;
976 const Symbol* name = NULL;
977 {
978 debug_only(NoSafepointVerifier nsv;)
979 for (index = 0; index < itfs_len; index++) {
980 const Klass* const k = _local_interfaces->at(index);
981 name = InstanceKlass::cast(k)->name();
982 // If no duplicates, add (name, NULL) in hashtable interface_names.
983 if (!put_after_lookup(name, NULL, interface_names)) {
984 dup = true;
985 break;
986 }
987 }
988 }
989 if (dup) {
990 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
991 name->as_C_string(), CHECK);
992 }
993 }
994 }
995
996 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
997 int constantvalue_index,
998 int signature_index,
999 TRAPS) const {
1000 // Make sure the constant pool entry is of a type appropriate to this field
1001 guarantee_property(
1002 (constantvalue_index > 0 &&
1003 constantvalue_index < cp->length()),
1004 "Bad initial value index %u in ConstantValue attribute in class file %s",
1005 constantvalue_index, CHECK);
1006
1007 const constantTag value_type = cp->tag_at(constantvalue_index);
1008 switch(cp->basic_type_for_signature_at(signature_index)) {
1009 case T_LONG: {
1010 guarantee_property(value_type.is_long(),
1011 "Inconsistent constant value type in class file %s",
1012 CHECK);
1013 break;
1014 }
1015 case T_FLOAT: {
1016 guarantee_property(value_type.is_float(),
1017 "Inconsistent constant value type in class file %s",
1018 CHECK);
1019 break;
1020 }
1021 case T_DOUBLE: {
1022 guarantee_property(value_type.is_double(),
1023 "Inconsistent constant value type in class file %s",
1024 CHECK);
1025 break;
1026 }
1027 case T_BYTE:
1028 case T_CHAR:
1029 case T_SHORT:
1030 case T_BOOLEAN:
1031 case T_INT: {
1032 guarantee_property(value_type.is_int(),
1033 "Inconsistent constant value type in class file %s",
1034 CHECK);
1035 break;
1036 }
1037 case T_OBJECT: {
1038 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1039 && value_type.is_string()),
1040 "Bad string initial value in class file %s",
1041 CHECK);
1042 break;
1043 }
1044 default: {
1045 classfile_parse_error("Unable to set initial value %u in class file %s",
1046 constantvalue_index,
1047 CHECK);
1048 }
1049 }
1050 }
1051
1052 class AnnotationCollector : public ResourceObj{
1053 public:
1054 enum Location { _in_field, _in_method, _in_class };
1055 enum ID {
1056 _unknown = 0,
1057 _method_CallerSensitive,
1058 _method_ForceInline,
1059 _method_DontInline,
1060 _method_InjectedProfile,
1061 _method_LambdaForm_Compiled,
1062 _method_LambdaForm_Hidden,
1063 _method_HotSpotIntrinsicCandidate,
1064 _jdk_internal_vm_annotation_Contended,
1065 _field_Stable,
1066 _jdk_internal_vm_annotation_ReservedStackAccess,
1067 _annotation_LIMIT
1068 };
1069 const Location _location;
1070 int _annotations_present;
1071 u2 _contended_group;
1072
1073 AnnotationCollector(Location location)
1074 : _location(location), _annotations_present(0)
1075 {
1076 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1077 }
1078 // If this annotation name has an ID, report it (or _none).
1079 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1080 // Set the annotation name:
1081 void set_annotation(ID id) {
1082 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1083 _annotations_present |= nth_bit((int)id);
1084 }
1085
1086 void remove_annotation(ID id) {
1087 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1088 _annotations_present &= ~nth_bit((int)id);
1089 }
1090
1091 // Report if the annotation is present.
1092 bool has_any_annotations() const { return _annotations_present != 0; }
1093 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1094
1095 void set_contended_group(u2 group) { _contended_group = group; }
1096 u2 contended_group() const { return _contended_group; }
1097
1098 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1099
1100 void set_stable(bool stable) { set_annotation(_field_Stable); }
1101 bool is_stable() const { return has_annotation(_field_Stable); }
1102 };
1103
1104 // This class also doubles as a holder for metadata cleanup.
1105 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1106 private:
1107 ClassLoaderData* _loader_data;
1108 AnnotationArray* _field_annotations;
1109 AnnotationArray* _field_type_annotations;
1110 public:
1111 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1112 AnnotationCollector(_in_field),
1113 _loader_data(loader_data),
1114 _field_annotations(NULL),
1115 _field_type_annotations(NULL) {}
1116 ~FieldAnnotationCollector();
1117 void apply_to(FieldInfo* f);
1118 AnnotationArray* field_annotations() { return _field_annotations; }
1119 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1120
1121 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1122 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1123 };
1124
1125 class MethodAnnotationCollector : public AnnotationCollector{
1126 public:
1127 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1128 void apply_to(const methodHandle& m);
1129 };
1130
1131 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1132 public:
1133 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1134 void apply_to(InstanceKlass* ik);
1135 };
1136
1137
1138 static int skip_annotation_value(const u1*, int, int); // fwd decl
1139
1140 // Safely increment index by val if does not pass limit
1141 #define SAFE_ADD(index, limit, val) \
1142 if (index >= limit - val) return limit; \
1143 index += val;
1144
1145 // Skip an annotation. Return >=limit if there is any problem.
1146 static int skip_annotation(const u1* buffer, int limit, int index) {
1147 assert(buffer != NULL, "invariant");
1148 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1149 // value := switch (tag:u1) { ... }
1150 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1151 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1152 while (--nmem >= 0 && index < limit) {
1153 SAFE_ADD(index, limit, 2); // skip member
1154 index = skip_annotation_value(buffer, limit, index);
1155 }
1156 return index;
1157 }
1158
1159 // Skip an annotation value. Return >=limit if there is any problem.
1160 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1161 assert(buffer != NULL, "invariant");
1162
1163 // value := switch (tag:u1) {
1164 // case B, C, I, S, Z, D, F, J, c: con:u2;
1165 // case e: e_class:u2 e_name:u2;
1166 // case s: s_con:u2;
1167 // case [: do(nval:u2) {value};
1168 // case @: annotation;
1169 // case s: s_con:u2;
1170 // }
1171 SAFE_ADD(index, limit, 1); // read tag
1172 const u1 tag = buffer[index - 1];
1173 switch (tag) {
1174 case 'B':
1175 case 'C':
1176 case 'I':
1177 case 'S':
1178 case 'Z':
1179 case 'D':
1180 case 'F':
1181 case 'J':
1182 case 'c':
1183 case 's':
1184 SAFE_ADD(index, limit, 2); // skip con or s_con
1185 break;
1186 case 'e':
1187 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1188 break;
1189 case '[':
1190 {
1191 SAFE_ADD(index, limit, 2); // read nval
1192 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1193 while (--nval >= 0 && index < limit) {
1194 index = skip_annotation_value(buffer, limit, index);
1195 }
1196 }
1197 break;
1198 case '@':
1199 index = skip_annotation(buffer, limit, index);
1200 break;
1201 default:
1202 return limit; // bad tag byte
1203 }
1204 return index;
1205 }
1206
1207 // Sift through annotations, looking for those significant to the VM:
1208 static void parse_annotations(const ConstantPool* const cp,
1209 const u1* buffer, int limit,
1210 AnnotationCollector* coll,
1211 ClassLoaderData* loader_data,
1212 TRAPS) {
1213
1214 assert(cp != NULL, "invariant");
1215 assert(buffer != NULL, "invariant");
1216 assert(coll != NULL, "invariant");
1217 assert(loader_data != NULL, "invariant");
1218
1219 // annotations := do(nann:u2) {annotation}
1220 int index = 2; // read nann
1221 if (index >= limit) return;
1222 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1223 enum { // initial annotation layout
1224 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1225 count_off = 2, // u2 such as 1 (one value)
1226 member_off = 4, // utf8 such as 'value'
1227 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1228 e_tag_val = 'e',
1229 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1230 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1231 e_size = 11, // end of 'e' annotation
1232 c_tag_val = 'c', // payload is type
1233 c_con_off = 7, // utf8 payload, such as 'I'
1234 c_size = 9, // end of 'c' annotation
1235 s_tag_val = 's', // payload is String
1236 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1237 s_size = 9,
1238 min_size = 6 // smallest possible size (zero members)
1239 };
1240 // Cannot add min_size to index in case of overflow MAX_INT
1241 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1242 int index0 = index;
1243 index = skip_annotation(buffer, limit, index);
1244 const u1* const abase = buffer + index0;
1245 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1246 const int count = Bytes::get_Java_u2((address)abase + count_off);
1247 const Symbol* const aname = check_symbol_at(cp, atype);
1248 if (aname == NULL) break; // invalid annotation name
1249 const Symbol* member = NULL;
1250 if (count >= 1) {
1251 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1252 member = check_symbol_at(cp, member_index);
1253 if (member == NULL) break; // invalid member name
1254 }
1255
1256 // Here is where parsing particular annotations will take place.
1257 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1258 if (AnnotationCollector::_unknown == id) continue;
1259 coll->set_annotation(id);
1260
1261 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1262 // @Contended can optionally specify the contention group.
1263 //
1264 // Contended group defines the equivalence class over the fields:
1265 // the fields within the same contended group are not treated distinct.
1266 // The only exception is default group, which does not incur the
1267 // equivalence. Naturally, contention group for classes is meaningless.
1268 //
1269 // While the contention group is specified as String, annotation
1270 // values are already interned, and we might as well use the constant
1271 // pool index as the group tag.
1272 //
1273 u2 group_index = 0; // default contended group
1274 if (count == 1
1275 && s_size == (index - index0) // match size
1276 && s_tag_val == *(abase + tag_off)
1277 && member == vmSymbols::value_name()) {
1278 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1279 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1280 group_index = 0; // default contended group
1281 }
1282 }
1283 coll->set_contended_group(group_index);
1284 }
1285 }
1286 }
1287
1288
1289 // Parse attributes for a field.
1290 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1291 u2 attributes_count,
1292 bool is_static, u2 signature_index,
1293 u2* const constantvalue_index_addr,
1294 bool* const is_synthetic_addr,
1295 u2* const generic_signature_index_addr,
1296 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1297 TRAPS) {
1298 assert(cfs != NULL, "invariant");
1299 assert(constantvalue_index_addr != NULL, "invariant");
1300 assert(is_synthetic_addr != NULL, "invariant");
1301 assert(generic_signature_index_addr != NULL, "invariant");
1302 assert(parsed_annotations != NULL, "invariant");
1303 assert(attributes_count > 0, "attributes_count should be greater than 0");
1304
1305 u2 constantvalue_index = 0;
1306 u2 generic_signature_index = 0;
1307 bool is_synthetic = false;
1308 const u1* runtime_visible_annotations = NULL;
1309 int runtime_visible_annotations_length = 0;
1310 const u1* runtime_invisible_annotations = NULL;
1311 int runtime_invisible_annotations_length = 0;
1312 const u1* runtime_visible_type_annotations = NULL;
1313 int runtime_visible_type_annotations_length = 0;
1314 const u1* runtime_invisible_type_annotations = NULL;
1315 int runtime_invisible_type_annotations_length = 0;
1316 bool runtime_invisible_annotations_exists = false;
1317 bool runtime_invisible_type_annotations_exists = false;
1318 const ConstantPool* const cp = _cp;
1319
1320 while (attributes_count--) {
1321 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1322 const u2 attribute_name_index = cfs->get_u2_fast();
1323 const u4 attribute_length = cfs->get_u4_fast();
1324 check_property(valid_symbol_at(attribute_name_index),
1325 "Invalid field attribute index %u in class file %s",
1326 attribute_name_index,
1327 CHECK);
1328
1329 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1330 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1331 // ignore if non-static
1332 if (constantvalue_index != 0) {
1333 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1334 }
1335 check_property(
1336 attribute_length == 2,
1337 "Invalid ConstantValue field attribute length %u in class file %s",
1338 attribute_length, CHECK);
1339
1340 constantvalue_index = cfs->get_u2(CHECK);
1341 if (_need_verify) {
1342 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1343 }
1344 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1345 if (attribute_length != 0) {
1346 classfile_parse_error(
1347 "Invalid Synthetic field attribute length %u in class file %s",
1348 attribute_length, CHECK);
1349 }
1350 is_synthetic = true;
1351 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1352 if (attribute_length != 0) {
1353 classfile_parse_error(
1354 "Invalid Deprecated field attribute length %u in class file %s",
1355 attribute_length, CHECK);
1356 }
1357 } else if (_major_version >= JAVA_1_5_VERSION) {
1358 if (attribute_name == vmSymbols::tag_signature()) {
1359 if (generic_signature_index != 0) {
1360 classfile_parse_error(
1361 "Multiple Signature attributes for field in class file %s", CHECK);
1362 }
1363 if (attribute_length != 2) {
1364 classfile_parse_error(
1365 "Wrong size %u for field's Signature attribute in class file %s",
1366 attribute_length, CHECK);
1367 }
1368 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1369 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1370 if (runtime_visible_annotations != NULL) {
1371 classfile_parse_error(
1372 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1373 }
1374 runtime_visible_annotations_length = attribute_length;
1375 runtime_visible_annotations = cfs->current();
1376 assert(runtime_visible_annotations != NULL, "null visible annotations");
1377 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1378 parse_annotations(cp,
1379 runtime_visible_annotations,
1380 runtime_visible_annotations_length,
1381 parsed_annotations,
1382 _loader_data,
1383 CHECK);
1384 cfs->skip_u1_fast(runtime_visible_annotations_length);
1385 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1386 if (runtime_invisible_annotations_exists) {
1387 classfile_parse_error(
1388 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1389 }
1390 runtime_invisible_annotations_exists = true;
1391 if (PreserveAllAnnotations) {
1392 runtime_invisible_annotations_length = attribute_length;
1393 runtime_invisible_annotations = cfs->current();
1394 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1395 }
1396 cfs->skip_u1(attribute_length, CHECK);
1397 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1398 if (runtime_visible_type_annotations != NULL) {
1399 classfile_parse_error(
1400 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1401 }
1402 runtime_visible_type_annotations_length = attribute_length;
1403 runtime_visible_type_annotations = cfs->current();
1404 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1405 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1406 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1407 if (runtime_invisible_type_annotations_exists) {
1408 classfile_parse_error(
1409 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1410 } else {
1411 runtime_invisible_type_annotations_exists = true;
1412 }
1413 if (PreserveAllAnnotations) {
1414 runtime_invisible_type_annotations_length = attribute_length;
1415 runtime_invisible_type_annotations = cfs->current();
1416 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1417 }
1418 cfs->skip_u1(attribute_length, CHECK);
1419 } else {
1420 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1421 }
1422 } else {
1423 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1424 }
1425 }
1426
1427 *constantvalue_index_addr = constantvalue_index;
1428 *is_synthetic_addr = is_synthetic;
1429 *generic_signature_index_addr = generic_signature_index;
1430 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1431 runtime_visible_annotations_length,
1432 runtime_invisible_annotations,
1433 runtime_invisible_annotations_length,
1434 CHECK);
1435 parsed_annotations->set_field_annotations(a);
1436 a = assemble_annotations(runtime_visible_type_annotations,
1437 runtime_visible_type_annotations_length,
1438 runtime_invisible_type_annotations,
1439 runtime_invisible_type_annotations_length,
1440 CHECK);
1441 parsed_annotations->set_field_type_annotations(a);
1442 return;
1443 }
1444
1445
1446 // Field allocation types. Used for computing field offsets.
1447
1448 enum FieldAllocationType {
1449 STATIC_OOP, // Oops
1450 STATIC_BYTE, // Boolean, Byte, char
1451 STATIC_SHORT, // shorts
1452 STATIC_WORD, // ints
1453 STATIC_DOUBLE, // aligned long or double
1454 NONSTATIC_OOP,
1455 NONSTATIC_BYTE,
1456 NONSTATIC_SHORT,
1457 NONSTATIC_WORD,
1458 NONSTATIC_DOUBLE,
1459 MAX_FIELD_ALLOCATION_TYPE,
1460 BAD_ALLOCATION_TYPE = -1
1461 };
1462
1463 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1464 BAD_ALLOCATION_TYPE, // 0
1465 BAD_ALLOCATION_TYPE, // 1
1466 BAD_ALLOCATION_TYPE, // 2
1467 BAD_ALLOCATION_TYPE, // 3
1468 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1469 NONSTATIC_SHORT, // T_CHAR = 5,
1470 NONSTATIC_WORD, // T_FLOAT = 6,
1471 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1472 NONSTATIC_BYTE, // T_BYTE = 8,
1473 NONSTATIC_SHORT, // T_SHORT = 9,
1474 NONSTATIC_WORD, // T_INT = 10,
1475 NONSTATIC_DOUBLE, // T_LONG = 11,
1476 NONSTATIC_OOP, // T_OBJECT = 12,
1477 NONSTATIC_OOP, // T_ARRAY = 13,
1478 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1479 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1480 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1481 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1482 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1483 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1484 BAD_ALLOCATION_TYPE, // 0
1485 BAD_ALLOCATION_TYPE, // 1
1486 BAD_ALLOCATION_TYPE, // 2
1487 BAD_ALLOCATION_TYPE, // 3
1488 STATIC_BYTE , // T_BOOLEAN = 4,
1489 STATIC_SHORT, // T_CHAR = 5,
1490 STATIC_WORD, // T_FLOAT = 6,
1491 STATIC_DOUBLE, // T_DOUBLE = 7,
1492 STATIC_BYTE, // T_BYTE = 8,
1493 STATIC_SHORT, // T_SHORT = 9,
1494 STATIC_WORD, // T_INT = 10,
1495 STATIC_DOUBLE, // T_LONG = 11,
1496 STATIC_OOP, // T_OBJECT = 12,
1497 STATIC_OOP, // T_ARRAY = 13,
1498 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1499 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1500 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1501 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1502 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1503 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1504 };
1505
1506 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1507 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1508 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1509 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1510 return result;
1511 }
1512
1513 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1514 public:
1515 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1516
1517 FieldAllocationCount() {
1518 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1519 count[i] = 0;
1520 }
1521 }
1522
1523 FieldAllocationType update(bool is_static, BasicType type) {
1524 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1525 if (atype != BAD_ALLOCATION_TYPE) {
1526 // Make sure there is no overflow with injected fields.
1527 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1528 count[atype]++;
1529 }
1530 return atype;
1531 }
1532 };
1533
1534 // Side-effects: populates the _fields, _fields_annotations,
1535 // _fields_type_annotations fields
1536 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1537 bool is_interface,
1538 FieldAllocationCount* const fac,
1539 ConstantPool* cp,
1540 const int cp_size,
1541 u2* const java_fields_count_ptr,
1542 TRAPS) {
1543
1544 assert(cfs != NULL, "invariant");
1545 assert(fac != NULL, "invariant");
1546 assert(cp != NULL, "invariant");
1547 assert(java_fields_count_ptr != NULL, "invariant");
1548
1549 assert(NULL == _fields, "invariant");
1550 assert(NULL == _fields_annotations, "invariant");
1551 assert(NULL == _fields_type_annotations, "invariant");
1552
1553 cfs->guarantee_more(2, CHECK); // length
1554 const u2 length = cfs->get_u2_fast();
1555 *java_fields_count_ptr = length;
1556
1557 int num_injected = 0;
1558 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1559 &num_injected);
1560 const int total_fields = length + num_injected;
1561
1562 // The field array starts with tuples of shorts
1563 // [access, name index, sig index, initial value index, byte offset].
1564 // A generic signature slot only exists for field with generic
1565 // signature attribute. And the access flag is set with
1566 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1567 // signature slots are at the end of the field array and after all
1568 // other fields data.
1569 //
1570 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1571 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1572 // ...
1573 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1574 // [generic signature index]
1575 // [generic signature index]
1576 // ...
1577 //
1578 // Allocate a temporary resource array for field data. For each field,
1579 // a slot is reserved in the temporary array for the generic signature
1580 // index. After parsing all fields, the data are copied to a permanent
1581 // array and any unused slots will be discarded.
1582 ResourceMark rm(THREAD);
1583 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1584 u2,
1585 total_fields * (FieldInfo::field_slots + 1));
1586
1587 // The generic signature slots start after all other fields' data.
1588 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1589 int num_generic_signature = 0;
1590 for (int n = 0; n < length; n++) {
1591 // access_flags, name_index, descriptor_index, attributes_count
1592 cfs->guarantee_more(8, CHECK);
1593
1594 AccessFlags access_flags;
1595 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1596 verify_legal_field_modifiers(flags, is_interface, CHECK);
1597 access_flags.set_flags(flags);
1598
1599 const u2 name_index = cfs->get_u2_fast();
1600 check_property(valid_symbol_at(name_index),
1601 "Invalid constant pool index %u for field name in class file %s",
1602 name_index, CHECK);
1603 const Symbol* const name = cp->symbol_at(name_index);
1604 verify_legal_field_name(name, CHECK);
1605
1606 const u2 signature_index = cfs->get_u2_fast();
1607 check_property(valid_symbol_at(signature_index),
1608 "Invalid constant pool index %u for field signature in class file %s",
1609 signature_index, CHECK);
1610 const Symbol* const sig = cp->symbol_at(signature_index);
1611 verify_legal_field_signature(name, sig, CHECK);
1612
1613 u2 constantvalue_index = 0;
1614 bool is_synthetic = false;
1615 u2 generic_signature_index = 0;
1616 const bool is_static = access_flags.is_static();
1617 FieldAnnotationCollector parsed_annotations(_loader_data);
1618
1619 const u2 attributes_count = cfs->get_u2_fast();
1620 if (attributes_count > 0) {
1621 parse_field_attributes(cfs,
1622 attributes_count,
1623 is_static,
1624 signature_index,
1625 &constantvalue_index,
1626 &is_synthetic,
1627 &generic_signature_index,
1628 &parsed_annotations,
1629 CHECK);
1630
1631 if (parsed_annotations.field_annotations() != NULL) {
1632 if (_fields_annotations == NULL) {
1633 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1634 _loader_data, length, NULL,
1635 CHECK);
1636 }
1637 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1638 parsed_annotations.set_field_annotations(NULL);
1639 }
1640 if (parsed_annotations.field_type_annotations() != NULL) {
1641 if (_fields_type_annotations == NULL) {
1642 _fields_type_annotations =
1643 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1644 length,
1645 NULL,
1646 CHECK);
1647 }
1648 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1649 parsed_annotations.set_field_type_annotations(NULL);
1650 }
1651
1652 if (is_synthetic) {
1653 access_flags.set_is_synthetic();
1654 }
1655 if (generic_signature_index != 0) {
1656 access_flags.set_field_has_generic_signature();
1657 fa[generic_signature_slot] = generic_signature_index;
1658 generic_signature_slot ++;
1659 num_generic_signature ++;
1660 }
1661 }
1662
1663 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1664 field->initialize(access_flags.as_short(),
1665 name_index,
1666 signature_index,
1667 constantvalue_index);
1668 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1669
1670 // Remember how many oops we encountered and compute allocation type
1671 const FieldAllocationType atype = fac->update(is_static, type);
1672 field->set_allocation_type(atype);
1673
1674 // After field is initialized with type, we can augment it with aux info
1675 if (parsed_annotations.has_any_annotations())
1676 parsed_annotations.apply_to(field);
1677 }
1678
1679 int index = length;
1680 if (num_injected != 0) {
1681 for (int n = 0; n < num_injected; n++) {
1682 // Check for duplicates
1683 if (injected[n].may_be_java) {
1684 const Symbol* const name = injected[n].name();
1685 const Symbol* const signature = injected[n].signature();
1686 bool duplicate = false;
1687 for (int i = 0; i < length; i++) {
1688 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1689 if (name == cp->symbol_at(f->name_index()) &&
1690 signature == cp->symbol_at(f->signature_index())) {
1691 // Symbol is desclared in Java so skip this one
1692 duplicate = true;
1693 break;
1694 }
1695 }
1696 if (duplicate) {
1697 // These will be removed from the field array at the end
1698 continue;
1699 }
1700 }
1701
1702 // Injected field
1703 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1704 field->initialize(JVM_ACC_FIELD_INTERNAL,
1705 injected[n].name_index,
1706 injected[n].signature_index,
1707 0);
1708
1709 const BasicType type = FieldType::basic_type(injected[n].signature());
1710
1711 // Remember how many oops we encountered and compute allocation type
1712 const FieldAllocationType atype = fac->update(false, type);
1713 field->set_allocation_type(atype);
1714 index++;
1715 }
1716 }
1717
1718 assert(NULL == _fields, "invariant");
1719
1720 _fields =
1721 MetadataFactory::new_array<u2>(_loader_data,
1722 index * FieldInfo::field_slots + num_generic_signature,
1723 CHECK);
1724 // Sometimes injected fields already exist in the Java source so
1725 // the fields array could be too long. In that case the
1726 // fields array is trimed. Also unused slots that were reserved
1727 // for generic signature indexes are discarded.
1728 {
1729 int i = 0;
1730 for (; i < index * FieldInfo::field_slots; i++) {
1731 _fields->at_put(i, fa[i]);
1732 }
1733 for (int j = total_fields * FieldInfo::field_slots;
1734 j < generic_signature_slot; j++) {
1735 _fields->at_put(i++, fa[j]);
1736 }
1737 assert(_fields->length() == i, "");
1738 }
1739
1740 if (_need_verify && length > 1) {
1741 // Check duplicated fields
1742 ResourceMark rm(THREAD);
1743 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1744 THREAD, NameSigHash*, HASH_ROW_SIZE);
1745 initialize_hashtable(names_and_sigs);
1746 bool dup = false;
1747 const Symbol* name = NULL;
1748 const Symbol* sig = NULL;
1749 {
1750 debug_only(NoSafepointVerifier nsv;)
1751 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1752 name = fs.name();
1753 sig = fs.signature();
1754 // If no duplicates, add name/signature in hashtable names_and_sigs.
1755 if (!put_after_lookup(name, sig, names_and_sigs)) {
1756 dup = true;
1757 break;
1758 }
1759 }
1760 }
1761 if (dup) {
1762 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1763 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1764 }
1765 }
1766 }
1767
1768
1769 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1770 u4 code_length,
1771 u4 exception_table_length,
1772 TRAPS) {
1773 assert(cfs != NULL, "invariant");
1774
1775 const unsafe_u2* const exception_table_start = cfs->current();
1776 assert(exception_table_start != NULL, "null exception table");
1777
1778 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1779 // end_pc,
1780 // handler_pc,
1781 // catch_type_index
1782
1783 // Will check legal target after parsing code array in verifier.
1784 if (_need_verify) {
1785 for (unsigned int i = 0; i < exception_table_length; i++) {
1786 const u2 start_pc = cfs->get_u2_fast();
1787 const u2 end_pc = cfs->get_u2_fast();
1788 const u2 handler_pc = cfs->get_u2_fast();
1789 const u2 catch_type_index = cfs->get_u2_fast();
1790 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1791 "Illegal exception table range in class file %s",
1792 CHECK_NULL);
1793 guarantee_property(handler_pc < code_length,
1794 "Illegal exception table handler in class file %s",
1795 CHECK_NULL);
1796 if (catch_type_index != 0) {
1797 guarantee_property(valid_klass_reference_at(catch_type_index),
1798 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1799 }
1800 }
1801 } else {
1802 cfs->skip_u2_fast(exception_table_length * 4);
1803 }
1804 return exception_table_start;
1805 }
1806
1807 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1808 u4 code_length,
1809 CompressedLineNumberWriteStream**const write_stream,
1810 TRAPS) {
1811
1812 const ClassFileStream* const cfs = _stream;
1813 unsigned int num_entries = cfs->get_u2(CHECK);
1814
1815 // Each entry is a u2 start_pc, and a u2 line_number
1816 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1817
1818 // Verify line number attribute and table length
1819 check_property(
1820 code_attribute_length == sizeof(u2) + length_in_bytes,
1821 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1822
1823 cfs->guarantee_more(length_in_bytes, CHECK);
1824
1825 if ((*write_stream) == NULL) {
1826 if (length_in_bytes > fixed_buffer_size) {
1827 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1828 } else {
1829 (*write_stream) = new CompressedLineNumberWriteStream(
1830 _linenumbertable_buffer, fixed_buffer_size);
1831 }
1832 }
1833
1834 while (num_entries-- > 0) {
1835 const u2 bci = cfs->get_u2_fast(); // start_pc
1836 const u2 line = cfs->get_u2_fast(); // line_number
1837 guarantee_property(bci < code_length,
1838 "Invalid pc in LineNumberTable in class file %s", CHECK);
1839 (*write_stream)->write_pair(bci, line);
1840 }
1841 }
1842
1843
1844 class LVT_Hash : public AllStatic {
1845 public:
1846
1847 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1848 /*
1849 * 3-tuple start_bci/length/slot has to be unique key,
1850 * so the following comparison seems to be redundant:
1851 * && elem->name_cp_index == entry->_elem->name_cp_index
1852 */
1853 return (e0.start_bci == e1.start_bci &&
1854 e0.length == e1.length &&
1855 e0.name_cp_index == e1.name_cp_index &&
1856 e0.slot == e1.slot);
1857 }
1858
1859 static unsigned int hash(LocalVariableTableElement const& e0) {
1860 unsigned int raw_hash = e0.start_bci;
1861
1862 raw_hash = e0.length + raw_hash * 37;
1863 raw_hash = e0.name_cp_index + raw_hash * 37;
1864 raw_hash = e0.slot + raw_hash * 37;
1865
1866 return raw_hash;
1867 }
1868 };
1869
1870
1871 // Class file LocalVariableTable elements.
1872 class Classfile_LVT_Element {
1873 public:
1874 u2 start_bci;
1875 u2 length;
1876 u2 name_cp_index;
1877 u2 descriptor_cp_index;
1878 u2 slot;
1879 };
1880
1881 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1882 LocalVariableTableElement* const lvt) {
1883 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1884 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1885 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1886 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1887 lvt->signature_cp_index = 0;
1888 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1889 }
1890
1891 // Function is used to parse both attributes:
1892 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1893 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1894 u4 code_length,
1895 u2 max_locals,
1896 u4 code_attribute_length,
1897 u2* const localvariable_table_length,
1898 bool isLVTT,
1899 TRAPS) {
1900 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1901 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1902 const unsigned int size =
1903 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1904
1905 const ConstantPool* const cp = _cp;
1906
1907 // Verify local variable table attribute has right length
1908 if (_need_verify) {
1909 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1910 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1911 }
1912
1913 const unsafe_u2* const localvariable_table_start = cfs->current();
1914 assert(localvariable_table_start != NULL, "null local variable table");
1915 if (!_need_verify) {
1916 cfs->skip_u2_fast(size);
1917 } else {
1918 cfs->guarantee_more(size * 2, CHECK_NULL);
1919 for(int i = 0; i < (*localvariable_table_length); i++) {
1920 const u2 start_pc = cfs->get_u2_fast();
1921 const u2 length = cfs->get_u2_fast();
1922 const u2 name_index = cfs->get_u2_fast();
1923 const u2 descriptor_index = cfs->get_u2_fast();
1924 const u2 index = cfs->get_u2_fast();
1925 // Assign to a u4 to avoid overflow
1926 const u4 end_pc = (u4)start_pc + (u4)length;
1927
1928 if (start_pc >= code_length) {
1929 classfile_parse_error(
1930 "Invalid start_pc %u in %s in class file %s",
1931 start_pc, tbl_name, CHECK_NULL);
1932 }
1933 if (end_pc > code_length) {
1934 classfile_parse_error(
1935 "Invalid length %u in %s in class file %s",
1936 length, tbl_name, CHECK_NULL);
1937 }
1938 const int cp_size = cp->length();
1939 guarantee_property(valid_symbol_at(name_index),
1940 "Name index %u in %s has bad constant type in class file %s",
1941 name_index, tbl_name, CHECK_NULL);
1942 guarantee_property(valid_symbol_at(descriptor_index),
1943 "Signature index %u in %s has bad constant type in class file %s",
1944 descriptor_index, tbl_name, CHECK_NULL);
1945
1946 const Symbol* const name = cp->symbol_at(name_index);
1947 const Symbol* const sig = cp->symbol_at(descriptor_index);
1948 verify_legal_field_name(name, CHECK_NULL);
1949 u2 extra_slot = 0;
1950 if (!isLVTT) {
1951 verify_legal_field_signature(name, sig, CHECK_NULL);
1952
1953 // 4894874: check special cases for double and long local variables
1954 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1955 sig == vmSymbols::type_signature(T_LONG)) {
1956 extra_slot = 1;
1957 }
1958 }
1959 guarantee_property((index + extra_slot) < max_locals,
1960 "Invalid index %u in %s in class file %s",
1961 index, tbl_name, CHECK_NULL);
1962 }
1963 }
1964 return localvariable_table_start;
1965 }
1966
1967
1968 void ClassFileParser::parse_type_array(u2 array_length,
1969 u4 code_length,
1970 u4* const u1_index,
1971 u4* const u2_index,
1972 u1* const u1_array,
1973 u2* const u2_array,
1974 TRAPS) {
1975 const ClassFileStream* const cfs = _stream;
1976 u2 index = 0; // index in the array with long/double occupying two slots
1977 u4 i1 = *u1_index;
1978 u4 i2 = *u2_index + 1;
1979 for(int i = 0; i < array_length; i++) {
1980 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1981 index++;
1982 if (tag == ITEM_Long || tag == ITEM_Double) {
1983 index++;
1984 } else if (tag == ITEM_Object) {
1985 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1986 guarantee_property(valid_klass_reference_at(class_index),
1987 "Bad class index %u in StackMap in class file %s",
1988 class_index, CHECK);
1989 } else if (tag == ITEM_Uninitialized) {
1990 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1991 guarantee_property(
1992 offset < code_length,
1993 "Bad uninitialized type offset %u in StackMap in class file %s",
1994 offset, CHECK);
1995 } else {
1996 guarantee_property(
1997 tag <= (u1)ITEM_Uninitialized,
1998 "Unknown variable type %u in StackMap in class file %s",
1999 tag, CHECK);
2000 }
2001 }
2002 u2_array[*u2_index] = index;
2003 *u1_index = i1;
2004 *u2_index = i2;
2005 }
2006
2007 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2008 u4 code_attribute_length,
2009 bool need_verify,
2010 TRAPS) {
2011 assert(cfs != NULL, "invariant");
2012
2013 if (0 == code_attribute_length) {
2014 return NULL;
2015 }
2016
2017 const u1* const stackmap_table_start = cfs->current();
2018 assert(stackmap_table_start != NULL, "null stackmap table");
2019
2020 // check code_attribute_length first
2021 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2022
2023 if (!need_verify && !DumpSharedSpaces) {
2024 return NULL;
2025 }
2026 return stackmap_table_start;
2027 }
2028
2029 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2030 u2* const checked_exceptions_length,
2031 u4 method_attribute_length,
2032 TRAPS) {
2033 assert(cfs != NULL, "invariant");
2034 assert(checked_exceptions_length != NULL, "invariant");
2035
2036 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2037 *checked_exceptions_length = cfs->get_u2_fast();
2038 const unsigned int size =
2039 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2040 const unsafe_u2* const checked_exceptions_start = cfs->current();
2041 assert(checked_exceptions_start != NULL, "null checked exceptions");
2042 if (!_need_verify) {
2043 cfs->skip_u2_fast(size);
2044 } else {
2045 // Verify each value in the checked exception table
2046 u2 checked_exception;
2047 const u2 len = *checked_exceptions_length;
2048 cfs->guarantee_more(2 * len, CHECK_NULL);
2049 for (int i = 0; i < len; i++) {
2050 checked_exception = cfs->get_u2_fast();
2051 check_property(
2052 valid_klass_reference_at(checked_exception),
2053 "Exception name has bad type at constant pool %u in class file %s",
2054 checked_exception, CHECK_NULL);
2055 }
2056 }
2057 // check exceptions attribute length
2058 if (_need_verify) {
2059 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2060 sizeof(u2) * size),
2061 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2062 }
2063 return checked_exceptions_start;
2064 }
2065
2066 void ClassFileParser::throwIllegalSignature(const char* type,
2067 const Symbol* name,
2068 const Symbol* sig,
2069 TRAPS) const {
2070 assert(name != NULL, "invariant");
2071 assert(sig != NULL, "invariant");
2072
2073 ResourceMark rm(THREAD);
2074 Exceptions::fthrow(THREAD_AND_LOCATION,
2075 vmSymbols::java_lang_ClassFormatError(),
2076 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2077 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2078 }
2079
2080 AnnotationCollector::ID
2081 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2082 const Symbol* name) {
2083 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2084 // Privileged code can use all annotations. Other code silently drops some.
2085 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2086 loader_data->is_platform_class_loader_data() ||
2087 loader_data->is_anonymous();
2088 switch (sid) {
2089 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2090 if (_location != _in_method) break; // only allow for methods
2091 if (!privileged) break; // only allow in privileged code
2092 return _method_CallerSensitive;
2093 }
2094 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2095 if (_location != _in_method) break; // only allow for methods
2096 if (!privileged) break; // only allow in privileged code
2097 return _method_ForceInline;
2098 }
2099 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2100 if (_location != _in_method) break; // only allow for methods
2101 if (!privileged) break; // only allow in privileged code
2102 return _method_DontInline;
2103 }
2104 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2105 if (_location != _in_method) break; // only allow for methods
2106 if (!privileged) break; // only allow in privileged code
2107 return _method_InjectedProfile;
2108 }
2109 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2110 if (_location != _in_method) break; // only allow for methods
2111 if (!privileged) break; // only allow in privileged code
2112 return _method_LambdaForm_Compiled;
2113 }
2114 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2115 if (_location != _in_method) break; // only allow for methods
2116 if (!privileged) break; // only allow in privileged code
2117 return _method_LambdaForm_Hidden;
2118 }
2119 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2120 if (_location != _in_method) break; // only allow for methods
2121 if (!privileged) break; // only allow in privileged code
2122 return _method_HotSpotIntrinsicCandidate;
2123 }
2124 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2125 if (_location != _in_field) break; // only allow for fields
2126 if (!privileged) break; // only allow in privileged code
2127 return _field_Stable;
2128 }
2129 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2130 if (_location != _in_field && _location != _in_class) {
2131 break; // only allow for fields and classes
2132 }
2133 if (!EnableContended || (RestrictContended && !privileged)) {
2134 break; // honor privileges
2135 }
2136 return _jdk_internal_vm_annotation_Contended;
2137 }
2138 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2139 if (_location != _in_method) break; // only allow for methods
2140 if (RestrictReservedStack && !privileged) break; // honor privileges
2141 return _jdk_internal_vm_annotation_ReservedStackAccess;
2142 }
2143 default: {
2144 break;
2145 }
2146 }
2147 return AnnotationCollector::_unknown;
2148 }
2149
2150 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2151 if (is_contended())
2152 f->set_contended_group(contended_group());
2153 if (is_stable())
2154 f->set_stable(true);
2155 }
2156
2157 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2158 // If there's an error deallocate metadata for field annotations
2159 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2160 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2161 }
2162
2163 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2164 if (has_annotation(_method_CallerSensitive))
2165 m->set_caller_sensitive(true);
2166 if (has_annotation(_method_ForceInline))
2167 m->set_force_inline(true);
2168 if (has_annotation(_method_DontInline))
2169 m->set_dont_inline(true);
2170 if (has_annotation(_method_InjectedProfile))
2171 m->set_has_injected_profile(true);
2172 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2173 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2174 if (has_annotation(_method_LambdaForm_Hidden))
2175 m->set_hidden(true);
2176 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2177 m->set_intrinsic_candidate(true);
2178 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2179 m->set_has_reserved_stack_access(true);
2180 }
2181
2182 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2183 assert(ik != NULL, "invariant");
2184 ik->set_is_contended(is_contended());
2185 }
2186
2187 #define MAX_ARGS_SIZE 255
2188 #define MAX_CODE_SIZE 65535
2189 #define INITIAL_MAX_LVT_NUMBER 256
2190
2191 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2192 *
2193 * Rules for LVT's and LVTT's are:
2194 * - There can be any number of LVT's and LVTT's.
2195 * - If there are n LVT's, it is the same as if there was just
2196 * one LVT containing all the entries from the n LVT's.
2197 * - There may be no more than one LVT entry per local variable.
2198 * Two LVT entries are 'equal' if these fields are the same:
2199 * start_pc, length, name, slot
2200 * - There may be no more than one LVTT entry per each LVT entry.
2201 * Each LVTT entry has to match some LVT entry.
2202 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2203 */
2204 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2205 int lvt_cnt,
2206 u2* const localvariable_table_length,
2207 const unsafe_u2** const localvariable_table_start,
2208 int lvtt_cnt,
2209 u2* const localvariable_type_table_length,
2210 const unsafe_u2** const localvariable_type_table_start,
2211 TRAPS) {
2212
2213 ResourceMark rm(THREAD);
2214
2215 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2216 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2217
2218 LVT_HashTable* const table = new LVT_HashTable();
2219
2220 // To fill LocalVariableTable in
2221 const Classfile_LVT_Element* cf_lvt;
2222 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2223
2224 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2225 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2226 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2227 copy_lvt_element(&cf_lvt[idx], lvt);
2228 // If no duplicates, add LVT elem in hashtable.
2229 if (table->put(*lvt, lvt) == false
2230 && _need_verify
2231 && _major_version >= JAVA_1_5_VERSION) {
2232 classfile_parse_error("Duplicated LocalVariableTable attribute "
2233 "entry for '%s' in class file %s",
2234 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2235 CHECK);
2236 }
2237 }
2238 }
2239
2240 // To merge LocalVariableTable and LocalVariableTypeTable
2241 const Classfile_LVT_Element* cf_lvtt;
2242 LocalVariableTableElement lvtt_elem;
2243
2244 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2245 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2246 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2247 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2248 LocalVariableTableElement** entry = table->get(lvtt_elem);
2249 if (entry == NULL) {
2250 if (_need_verify) {
2251 classfile_parse_error("LVTT entry for '%s' in class file %s "
2252 "does not match any LVT entry",
2253 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2254 CHECK);
2255 }
2256 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2257 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2258 "entry for '%s' in class file %s",
2259 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2260 CHECK);
2261 } else {
2262 // to add generic signatures into LocalVariableTable
2263 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2264 }
2265 }
2266 }
2267 }
2268
2269
2270 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2271 const u1* runtime_visible_annotations,
2272 int runtime_visible_annotations_length,
2273 const u1* runtime_invisible_annotations,
2274 int runtime_invisible_annotations_length,
2275 const u1* runtime_visible_parameter_annotations,
2276 int runtime_visible_parameter_annotations_length,
2277 const u1* runtime_invisible_parameter_annotations,
2278 int runtime_invisible_parameter_annotations_length,
2279 const u1* runtime_visible_type_annotations,
2280 int runtime_visible_type_annotations_length,
2281 const u1* runtime_invisible_type_annotations,
2282 int runtime_invisible_type_annotations_length,
2283 const u1* annotation_default,
2284 int annotation_default_length,
2285 TRAPS) {
2286
2287 AnnotationArray* a;
2288
2289 if (runtime_visible_annotations_length +
2290 runtime_invisible_annotations_length > 0) {
2291 a = assemble_annotations(runtime_visible_annotations,
2292 runtime_visible_annotations_length,
2293 runtime_invisible_annotations,
2294 runtime_invisible_annotations_length,
2295 CHECK);
2296 cm->set_method_annotations(a);
2297 }
2298
2299 if (runtime_visible_parameter_annotations_length +
2300 runtime_invisible_parameter_annotations_length > 0) {
2301 a = assemble_annotations(runtime_visible_parameter_annotations,
2302 runtime_visible_parameter_annotations_length,
2303 runtime_invisible_parameter_annotations,
2304 runtime_invisible_parameter_annotations_length,
2305 CHECK);
2306 cm->set_parameter_annotations(a);
2307 }
2308
2309 if (annotation_default_length > 0) {
2310 a = assemble_annotations(annotation_default,
2311 annotation_default_length,
2312 NULL,
2313 0,
2314 CHECK);
2315 cm->set_default_annotations(a);
2316 }
2317
2318 if (runtime_visible_type_annotations_length +
2319 runtime_invisible_type_annotations_length > 0) {
2320 a = assemble_annotations(runtime_visible_type_annotations,
2321 runtime_visible_type_annotations_length,
2322 runtime_invisible_type_annotations,
2323 runtime_invisible_type_annotations_length,
2324 CHECK);
2325 cm->set_type_annotations(a);
2326 }
2327 }
2328
2329
2330 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2331 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2332 // Method* to save footprint, so we only know the size of the resulting Method* when the
2333 // entire method attribute is parsed.
2334 //
2335 // The promoted_flags parameter is used to pass relevant access_flags
2336 // from the method back up to the containing klass. These flag values
2337 // are added to klass's access_flags.
2338
2339 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2340 bool is_interface,
2341 const ConstantPool* cp,
2342 AccessFlags* const promoted_flags,
2343 TRAPS) {
2344 assert(cfs != NULL, "invariant");
2345 assert(cp != NULL, "invariant");
2346 assert(promoted_flags != NULL, "invariant");
2347
2348 ResourceMark rm(THREAD);
2349 // Parse fixed parts:
2350 // access_flags, name_index, descriptor_index, attributes_count
2351 cfs->guarantee_more(8, CHECK_NULL);
2352
2353 int flags = cfs->get_u2_fast();
2354 const u2 name_index = cfs->get_u2_fast();
2355 const int cp_size = cp->length();
2356 check_property(
2357 valid_symbol_at(name_index),
2358 "Illegal constant pool index %u for method name in class file %s",
2359 name_index, CHECK_NULL);
2360 const Symbol* const name = cp->symbol_at(name_index);
2361 verify_legal_method_name(name, CHECK_NULL);
2362
2363 const u2 signature_index = cfs->get_u2_fast();
2364 guarantee_property(
2365 valid_symbol_at(signature_index),
2366 "Illegal constant pool index %u for method signature in class file %s",
2367 signature_index, CHECK_NULL);
2368 const Symbol* const signature = cp->symbol_at(signature_index);
2369
2370 if (name == vmSymbols::class_initializer_name()) {
2371 // We ignore the other access flags for a valid class initializer.
2372 // (JVM Spec 2nd ed., chapter 4.6)
2373 if (_major_version < 51) { // backward compatibility
2374 flags = JVM_ACC_STATIC;
2375 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2376 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2377 } else {
2378 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2379 }
2380 } else {
2381 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2382 }
2383
2384 if (name == vmSymbols::object_initializer_name() && is_interface) {
2385 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2386 }
2387
2388 int args_size = -1; // only used when _need_verify is true
2389 if (_need_verify) {
2390 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2391 verify_legal_method_signature(name, signature, CHECK_NULL);
2392 if (args_size > MAX_ARGS_SIZE) {
2393 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2394 }
2395 }
2396
2397 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2398
2399 // Default values for code and exceptions attribute elements
2400 u2 max_stack = 0;
2401 u2 max_locals = 0;
2402 u4 code_length = 0;
2403 const u1* code_start = 0;
2404 u2 exception_table_length = 0;
2405 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2406 Array<int>* exception_handlers = Universe::the_empty_int_array();
2407 u2 checked_exceptions_length = 0;
2408 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2409 CompressedLineNumberWriteStream* linenumber_table = NULL;
2410 int linenumber_table_length = 0;
2411 int total_lvt_length = 0;
2412 u2 lvt_cnt = 0;
2413 u2 lvtt_cnt = 0;
2414 bool lvt_allocated = false;
2415 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2416 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2417 u2* localvariable_table_length = NULL;
2418 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2419 u2* localvariable_type_table_length = NULL;
2420 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2421 int method_parameters_length = -1;
2422 const u1* method_parameters_data = NULL;
2423 bool method_parameters_seen = false;
2424 bool parsed_code_attribute = false;
2425 bool parsed_checked_exceptions_attribute = false;
2426 bool parsed_stackmap_attribute = false;
2427 // stackmap attribute - JDK1.5
2428 const u1* stackmap_data = NULL;
2429 int stackmap_data_length = 0;
2430 u2 generic_signature_index = 0;
2431 MethodAnnotationCollector parsed_annotations;
2432 const u1* runtime_visible_annotations = NULL;
2433 int runtime_visible_annotations_length = 0;
2434 const u1* runtime_invisible_annotations = NULL;
2435 int runtime_invisible_annotations_length = 0;
2436 const u1* runtime_visible_parameter_annotations = NULL;
2437 int runtime_visible_parameter_annotations_length = 0;
2438 const u1* runtime_invisible_parameter_annotations = NULL;
2439 int runtime_invisible_parameter_annotations_length = 0;
2440 const u1* runtime_visible_type_annotations = NULL;
2441 int runtime_visible_type_annotations_length = 0;
2442 const u1* runtime_invisible_type_annotations = NULL;
2443 int runtime_invisible_type_annotations_length = 0;
2444 bool runtime_invisible_annotations_exists = false;
2445 bool runtime_invisible_type_annotations_exists = false;
2446 bool runtime_invisible_parameter_annotations_exists = false;
2447 const u1* annotation_default = NULL;
2448 int annotation_default_length = 0;
2449
2450 // Parse code and exceptions attribute
2451 u2 method_attributes_count = cfs->get_u2_fast();
2452 while (method_attributes_count--) {
2453 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2454 const u2 method_attribute_name_index = cfs->get_u2_fast();
2455 const u4 method_attribute_length = cfs->get_u4_fast();
2456 check_property(
2457 valid_symbol_at(method_attribute_name_index),
2458 "Invalid method attribute name index %u in class file %s",
2459 method_attribute_name_index, CHECK_NULL);
2460
2461 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2462 if (method_attribute_name == vmSymbols::tag_code()) {
2463 // Parse Code attribute
2464 if (_need_verify) {
2465 guarantee_property(
2466 !access_flags.is_native() && !access_flags.is_abstract(),
2467 "Code attribute in native or abstract methods in class file %s",
2468 CHECK_NULL);
2469 }
2470 if (parsed_code_attribute) {
2471 classfile_parse_error("Multiple Code attributes in class file %s",
2472 CHECK_NULL);
2473 }
2474 parsed_code_attribute = true;
2475
2476 // Stack size, locals size, and code size
2477 if (_major_version == 45 && _minor_version <= 2) {
2478 cfs->guarantee_more(4, CHECK_NULL);
2479 max_stack = cfs->get_u1_fast();
2480 max_locals = cfs->get_u1_fast();
2481 code_length = cfs->get_u2_fast();
2482 } else {
2483 cfs->guarantee_more(8, CHECK_NULL);
2484 max_stack = cfs->get_u2_fast();
2485 max_locals = cfs->get_u2_fast();
2486 code_length = cfs->get_u4_fast();
2487 }
2488 if (_need_verify) {
2489 guarantee_property(args_size <= max_locals,
2490 "Arguments can't fit into locals in class file %s",
2491 CHECK_NULL);
2492 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2493 "Invalid method Code length %u in class file %s",
2494 code_length, CHECK_NULL);
2495 }
2496 // Code pointer
2497 code_start = cfs->current();
2498 assert(code_start != NULL, "null code start");
2499 cfs->guarantee_more(code_length, CHECK_NULL);
2500 cfs->skip_u1_fast(code_length);
2501
2502 // Exception handler table
2503 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2504 exception_table_length = cfs->get_u2_fast();
2505 if (exception_table_length > 0) {
2506 exception_table_start = parse_exception_table(cfs,
2507 code_length,
2508 exception_table_length,
2509 CHECK_NULL);
2510 }
2511
2512 // Parse additional attributes in code attribute
2513 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2514 u2 code_attributes_count = cfs->get_u2_fast();
2515
2516 unsigned int calculated_attribute_length = 0;
2517
2518 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2519 calculated_attribute_length =
2520 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2521 } else {
2522 // max_stack, locals and length are smaller in pre-version 45.2 classes
2523 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2524 }
2525 calculated_attribute_length +=
2526 code_length +
2527 sizeof(exception_table_length) +
2528 sizeof(code_attributes_count) +
2529 exception_table_length *
2530 ( sizeof(u2) + // start_pc
2531 sizeof(u2) + // end_pc
2532 sizeof(u2) + // handler_pc
2533 sizeof(u2) ); // catch_type_index
2534
2535 while (code_attributes_count--) {
2536 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2537 const u2 code_attribute_name_index = cfs->get_u2_fast();
2538 const u4 code_attribute_length = cfs->get_u4_fast();
2539 calculated_attribute_length += code_attribute_length +
2540 sizeof(code_attribute_name_index) +
2541 sizeof(code_attribute_length);
2542 check_property(valid_symbol_at(code_attribute_name_index),
2543 "Invalid code attribute name index %u in class file %s",
2544 code_attribute_name_index,
2545 CHECK_NULL);
2546 if (LoadLineNumberTables &&
2547 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2548 // Parse and compress line number table
2549 parse_linenumber_table(code_attribute_length,
2550 code_length,
2551 &linenumber_table,
2552 CHECK_NULL);
2553
2554 } else if (LoadLocalVariableTables &&
2555 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2556 // Parse local variable table
2557 if (!lvt_allocated) {
2558 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2559 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2560 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2561 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2562 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2563 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2564 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2565 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2566 lvt_allocated = true;
2567 }
2568 if (lvt_cnt == max_lvt_cnt) {
2569 max_lvt_cnt <<= 1;
2570 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2571 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2572 }
2573 localvariable_table_start[lvt_cnt] =
2574 parse_localvariable_table(cfs,
2575 code_length,
2576 max_locals,
2577 code_attribute_length,
2578 &localvariable_table_length[lvt_cnt],
2579 false, // is not LVTT
2580 CHECK_NULL);
2581 total_lvt_length += localvariable_table_length[lvt_cnt];
2582 lvt_cnt++;
2583 } else if (LoadLocalVariableTypeTables &&
2584 _major_version >= JAVA_1_5_VERSION &&
2585 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2586 if (!lvt_allocated) {
2587 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2588 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2589 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2590 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2591 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2592 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2593 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2594 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2595 lvt_allocated = true;
2596 }
2597 // Parse local variable type table
2598 if (lvtt_cnt == max_lvtt_cnt) {
2599 max_lvtt_cnt <<= 1;
2600 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2601 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2602 }
2603 localvariable_type_table_start[lvtt_cnt] =
2604 parse_localvariable_table(cfs,
2605 code_length,
2606 max_locals,
2607 code_attribute_length,
2608 &localvariable_type_table_length[lvtt_cnt],
2609 true, // is LVTT
2610 CHECK_NULL);
2611 lvtt_cnt++;
2612 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2613 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2614 // Stack map is only needed by the new verifier in JDK1.5.
2615 if (parsed_stackmap_attribute) {
2616 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2617 }
2618 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2619 stackmap_data_length = code_attribute_length;
2620 parsed_stackmap_attribute = true;
2621 } else {
2622 // Skip unknown attributes
2623 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2624 }
2625 }
2626 // check method attribute length
2627 if (_need_verify) {
2628 guarantee_property(method_attribute_length == calculated_attribute_length,
2629 "Code segment has wrong length in class file %s",
2630 CHECK_NULL);
2631 }
2632 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2633 // Parse Exceptions attribute
2634 if (parsed_checked_exceptions_attribute) {
2635 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2636 CHECK_NULL);
2637 }
2638 parsed_checked_exceptions_attribute = true;
2639 checked_exceptions_start =
2640 parse_checked_exceptions(cfs,
2641 &checked_exceptions_length,
2642 method_attribute_length,
2643 CHECK_NULL);
2644 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2645 // reject multiple method parameters
2646 if (method_parameters_seen) {
2647 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2648 CHECK_NULL);
2649 }
2650 method_parameters_seen = true;
2651 method_parameters_length = cfs->get_u1_fast();
2652 const u2 real_length = (method_parameters_length * 4u) + 1u;
2653 if (method_attribute_length != real_length) {
2654 classfile_parse_error(
2655 "Invalid MethodParameters method attribute length %u in class file",
2656 method_attribute_length, CHECK_NULL);
2657 }
2658 method_parameters_data = cfs->current();
2659 cfs->skip_u2_fast(method_parameters_length);
2660 cfs->skip_u2_fast(method_parameters_length);
2661 // ignore this attribute if it cannot be reflected
2662 if (!SystemDictionary::Parameter_klass_loaded())
2663 method_parameters_length = -1;
2664 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2665 if (method_attribute_length != 0) {
2666 classfile_parse_error(
2667 "Invalid Synthetic method attribute length %u in class file %s",
2668 method_attribute_length, CHECK_NULL);
2669 }
2670 // Should we check that there hasn't already been a synthetic attribute?
2671 access_flags.set_is_synthetic();
2672 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2673 if (method_attribute_length != 0) {
2674 classfile_parse_error(
2675 "Invalid Deprecated method attribute length %u in class file %s",
2676 method_attribute_length, CHECK_NULL);
2677 }
2678 } else if (_major_version >= JAVA_1_5_VERSION) {
2679 if (method_attribute_name == vmSymbols::tag_signature()) {
2680 if (generic_signature_index != 0) {
2681 classfile_parse_error(
2682 "Multiple Signature attributes for method in class file %s",
2683 CHECK_NULL);
2684 }
2685 if (method_attribute_length != 2) {
2686 classfile_parse_error(
2687 "Invalid Signature attribute length %u in class file %s",
2688 method_attribute_length, CHECK_NULL);
2689 }
2690 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2691 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2692 if (runtime_visible_annotations != NULL) {
2693 classfile_parse_error(
2694 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2695 CHECK_NULL);
2696 }
2697 runtime_visible_annotations_length = method_attribute_length;
2698 runtime_visible_annotations = cfs->current();
2699 assert(runtime_visible_annotations != NULL, "null visible annotations");
2700 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2701 parse_annotations(cp,
2702 runtime_visible_annotations,
2703 runtime_visible_annotations_length,
2704 &parsed_annotations,
2705 _loader_data,
2706 CHECK_NULL);
2707 cfs->skip_u1_fast(runtime_visible_annotations_length);
2708 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2709 if (runtime_invisible_annotations_exists) {
2710 classfile_parse_error(
2711 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2712 CHECK_NULL);
2713 }
2714 runtime_invisible_annotations_exists = true;
2715 if (PreserveAllAnnotations) {
2716 runtime_invisible_annotations_length = method_attribute_length;
2717 runtime_invisible_annotations = cfs->current();
2718 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2719 }
2720 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2721 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2722 if (runtime_visible_parameter_annotations != NULL) {
2723 classfile_parse_error(
2724 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2725 CHECK_NULL);
2726 }
2727 runtime_visible_parameter_annotations_length = method_attribute_length;
2728 runtime_visible_parameter_annotations = cfs->current();
2729 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2730 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2731 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2732 if (runtime_invisible_parameter_annotations_exists) {
2733 classfile_parse_error(
2734 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2735 CHECK_NULL);
2736 }
2737 runtime_invisible_parameter_annotations_exists = true;
2738 if (PreserveAllAnnotations) {
2739 runtime_invisible_parameter_annotations_length = method_attribute_length;
2740 runtime_invisible_parameter_annotations = cfs->current();
2741 assert(runtime_invisible_parameter_annotations != NULL,
2742 "null invisible parameter annotations");
2743 }
2744 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2745 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2746 if (annotation_default != NULL) {
2747 classfile_parse_error(
2748 "Multiple AnnotationDefault attributes for method in class file %s",
2749 CHECK_NULL);
2750 }
2751 annotation_default_length = method_attribute_length;
2752 annotation_default = cfs->current();
2753 assert(annotation_default != NULL, "null annotation default");
2754 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2755 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2756 if (runtime_visible_type_annotations != NULL) {
2757 classfile_parse_error(
2758 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2759 CHECK_NULL);
2760 }
2761 runtime_visible_type_annotations_length = method_attribute_length;
2762 runtime_visible_type_annotations = cfs->current();
2763 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2764 // No need for the VM to parse Type annotations
2765 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2766 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2767 if (runtime_invisible_type_annotations_exists) {
2768 classfile_parse_error(
2769 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2770 CHECK_NULL);
2771 } else {
2772 runtime_invisible_type_annotations_exists = true;
2773 }
2774 if (PreserveAllAnnotations) {
2775 runtime_invisible_type_annotations_length = method_attribute_length;
2776 runtime_invisible_type_annotations = cfs->current();
2777 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2778 }
2779 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2780 } else {
2781 // Skip unknown attributes
2782 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2783 }
2784 } else {
2785 // Skip unknown attributes
2786 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2787 }
2788 }
2789
2790 if (linenumber_table != NULL) {
2791 linenumber_table->write_terminator();
2792 linenumber_table_length = linenumber_table->position();
2793 }
2794
2795 // Make sure there's at least one Code attribute in non-native/non-abstract method
2796 if (_need_verify) {
2797 guarantee_property(access_flags.is_native() ||
2798 access_flags.is_abstract() ||
2799 parsed_code_attribute,
2800 "Absent Code attribute in method that is not native or abstract in class file %s",
2801 CHECK_NULL);
2802 }
2803
2804 // All sizing information for a Method* is finally available, now create it
2805 InlineTableSizes sizes(
2806 total_lvt_length,
2807 linenumber_table_length,
2808 exception_table_length,
2809 checked_exceptions_length,
2810 method_parameters_length,
2811 generic_signature_index,
2812 runtime_visible_annotations_length +
2813 runtime_invisible_annotations_length,
2814 runtime_visible_parameter_annotations_length +
2815 runtime_invisible_parameter_annotations_length,
2816 runtime_visible_type_annotations_length +
2817 runtime_invisible_type_annotations_length,
2818 annotation_default_length,
2819 0);
2820
2821 Method* const m = Method::allocate(_loader_data,
2822 code_length,
2823 access_flags,
2824 &sizes,
2825 ConstMethod::NORMAL,
2826 CHECK_NULL);
2827
2828 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2829
2830 // Fill in information from fixed part (access_flags already set)
2831 m->set_constants(_cp);
2832 m->set_name_index(name_index);
2833 m->set_signature_index(signature_index);
2834
2835 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2836 m->constMethod()->set_result_type(rtf.type());
2837
2838 if (args_size >= 0) {
2839 m->set_size_of_parameters(args_size);
2840 } else {
2841 m->compute_size_of_parameters(THREAD);
2842 }
2843 #ifdef ASSERT
2844 if (args_size >= 0) {
2845 m->compute_size_of_parameters(THREAD);
2846 assert(args_size == m->size_of_parameters(), "");
2847 }
2848 #endif
2849
2850 // Fill in code attribute information
2851 m->set_max_stack(max_stack);
2852 m->set_max_locals(max_locals);
2853 if (stackmap_data != NULL) {
2854 m->constMethod()->copy_stackmap_data(_loader_data,
2855 (u1*)stackmap_data,
2856 stackmap_data_length,
2857 CHECK_NULL);
2858 }
2859
2860 // Copy byte codes
2861 m->set_code((u1*)code_start);
2862
2863 // Copy line number table
2864 if (linenumber_table != NULL) {
2865 memcpy(m->compressed_linenumber_table(),
2866 linenumber_table->buffer(),
2867 linenumber_table_length);
2868 }
2869
2870 // Copy exception table
2871 if (exception_table_length > 0) {
2872 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2873 m->exception_table_start(),
2874 exception_table_length * sizeof(ExceptionTableElement),
2875 sizeof(u2));
2876 }
2877
2878 // Copy method parameters
2879 if (method_parameters_length > 0) {
2880 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2881 for (int i = 0; i < method_parameters_length; i++) {
2882 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2883 method_parameters_data += 2;
2884 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2885 method_parameters_data += 2;
2886 }
2887 }
2888
2889 // Copy checked exceptions
2890 if (checked_exceptions_length > 0) {
2891 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2892 m->checked_exceptions_start(),
2893 checked_exceptions_length * sizeof(CheckedExceptionElement),
2894 sizeof(u2));
2895 }
2896
2897 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2898 if (total_lvt_length > 0) {
2899 promoted_flags->set_has_localvariable_table();
2900 copy_localvariable_table(m->constMethod(),
2901 lvt_cnt,
2902 localvariable_table_length,
2903 localvariable_table_start,
2904 lvtt_cnt,
2905 localvariable_type_table_length,
2906 localvariable_type_table_start,
2907 CHECK_NULL);
2908 }
2909
2910 if (parsed_annotations.has_any_annotations())
2911 parsed_annotations.apply_to(m);
2912
2913 // Copy annotations
2914 copy_method_annotations(m->constMethod(),
2915 runtime_visible_annotations,
2916 runtime_visible_annotations_length,
2917 runtime_invisible_annotations,
2918 runtime_invisible_annotations_length,
2919 runtime_visible_parameter_annotations,
2920 runtime_visible_parameter_annotations_length,
2921 runtime_invisible_parameter_annotations,
2922 runtime_invisible_parameter_annotations_length,
2923 runtime_visible_type_annotations,
2924 runtime_visible_type_annotations_length,
2925 runtime_invisible_type_annotations,
2926 runtime_invisible_type_annotations_length,
2927 annotation_default,
2928 annotation_default_length,
2929 CHECK_NULL);
2930
2931 if (name == vmSymbols::finalize_method_name() &&
2932 signature == vmSymbols::void_method_signature()) {
2933 if (m->is_empty_method()) {
2934 _has_empty_finalizer = true;
2935 } else {
2936 _has_finalizer = true;
2937 }
2938 }
2939 if (name == vmSymbols::object_initializer_name() &&
2940 signature == vmSymbols::void_method_signature() &&
2941 m->is_vanilla_constructor()) {
2942 _has_vanilla_constructor = true;
2943 }
2944
2945 NOT_PRODUCT(m->verify());
2946 return m;
2947 }
2948
2949
2950 // The promoted_flags parameter is used to pass relevant access_flags
2951 // from the methods back up to the containing klass. These flag values
2952 // are added to klass's access_flags.
2953 // Side-effects: populates the _methods field in the parser
2954 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2955 bool is_interface,
2956 AccessFlags* promoted_flags,
2957 bool* has_final_method,
2958 bool* declares_nonstatic_concrete_methods,
2959 TRAPS) {
2960 assert(cfs != NULL, "invariant");
2961 assert(promoted_flags != NULL, "invariant");
2962 assert(has_final_method != NULL, "invariant");
2963 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2964
2965 assert(NULL == _methods, "invariant");
2966
2967 cfs->guarantee_more(2, CHECK); // length
2968 const u2 length = cfs->get_u2_fast();
2969 if (length == 0) {
2970 _methods = Universe::the_empty_method_array();
2971 } else {
2972 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2973 length,
2974 NULL,
2975 CHECK);
2976
2977 for (int index = 0; index < length; index++) {
2978 Method* method = parse_method(cfs,
2979 is_interface,
2980 _cp,
2981 promoted_flags,
2982 CHECK);
2983
2984 if (method->is_final()) {
2985 *has_final_method = true;
2986 }
2987 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2988 // used for interface initialization, and default method inheritance analysis
2989 if (is_interface && !(*declares_nonstatic_concrete_methods)
2990 && !method->is_abstract() && !method->is_static()) {
2991 *declares_nonstatic_concrete_methods = true;
2992 }
2993 _methods->at_put(index, method);
2994 }
2995
2996 if (_need_verify && length > 1) {
2997 // Check duplicated methods
2998 ResourceMark rm(THREAD);
2999 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3000 THREAD, NameSigHash*, HASH_ROW_SIZE);
3001 initialize_hashtable(names_and_sigs);
3002 bool dup = false;
3003 const Symbol* name = NULL;
3004 const Symbol* sig = NULL;
3005 {
3006 debug_only(NoSafepointVerifier nsv;)
3007 for (int i = 0; i < length; i++) {
3008 const Method* const m = _methods->at(i);
3009 name = m->name();
3010 sig = m->signature();
3011 // If no duplicates, add name/signature in hashtable names_and_sigs.
3012 if (!put_after_lookup(name, sig, names_and_sigs)) {
3013 dup = true;
3014 break;
3015 }
3016 }
3017 }
3018 if (dup) {
3019 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3020 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3021 }
3022 }
3023 }
3024 }
3025
3026 static const intArray* sort_methods(Array<Method*>* methods) {
3027 const int length = methods->length();
3028 // If JVMTI original method ordering or sharing is enabled we have to
3029 // remember the original class file ordering.
3030 // We temporarily use the vtable_index field in the Method* to store the
3031 // class file index, so we can read in after calling qsort.
3032 // Put the method ordering in the shared archive.
3033 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3034 for (int index = 0; index < length; index++) {
3035 Method* const m = methods->at(index);
3036 assert(!m->valid_vtable_index(), "vtable index should not be set");
3037 m->set_vtable_index(index);
3038 }
3039 }
3040 // Sort method array by ascending method name (for faster lookups & vtable construction)
3041 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3042 Method::sort_methods(methods);
3043
3044 intArray* method_ordering = NULL;
3045 // If JVMTI original method ordering or sharing is enabled construct int
3046 // array remembering the original ordering
3047 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3048 method_ordering = new intArray(length, length, -1);
3049 for (int index = 0; index < length; index++) {
3050 Method* const m = methods->at(index);
3051 const int old_index = m->vtable_index();
3052 assert(old_index >= 0 && old_index < length, "invalid method index");
3053 method_ordering->at_put(index, old_index);
3054 m->set_vtable_index(Method::invalid_vtable_index);
3055 }
3056 }
3057 return method_ordering;
3058 }
3059
3060 // Parse generic_signature attribute for methods and fields
3061 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3062 TRAPS) {
3063 assert(cfs != NULL, "invariant");
3064
3065 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3066 const u2 generic_signature_index = cfs->get_u2_fast();
3067 check_property(
3068 valid_symbol_at(generic_signature_index),
3069 "Invalid Signature attribute at constant pool index %u in class file %s",
3070 generic_signature_index, CHECK_0);
3071 return generic_signature_index;
3072 }
3073
3074 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3075 TRAPS) {
3076
3077 assert(cfs != NULL, "invariant");
3078
3079 cfs->guarantee_more(2, CHECK); // sourcefile_index
3080 const u2 sourcefile_index = cfs->get_u2_fast();
3081 check_property(
3082 valid_symbol_at(sourcefile_index),
3083 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3084 sourcefile_index, CHECK);
3085 set_class_sourcefile_index(sourcefile_index);
3086 }
3087
3088 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3089 int length,
3090 TRAPS) {
3091 assert(cfs != NULL, "invariant");
3092
3093 const u1* const sde_buffer = cfs->current();
3094 assert(sde_buffer != NULL, "null sde buffer");
3095
3096 // Don't bother storing it if there is no way to retrieve it
3097 if (JvmtiExport::can_get_source_debug_extension()) {
3098 assert((length+1) > length, "Overflow checking");
3099 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3100 for (int i = 0; i < length; i++) {
3101 sde[i] = sde_buffer[i];
3102 }
3103 sde[length] = '\0';
3104 set_class_sde_buffer((const char*)sde, length);
3105 }
3106 // Got utf8 string, set stream position forward
3107 cfs->skip_u1(length, CHECK);
3108 }
3109
3110
3111 // Inner classes can be static, private or protected (classic VM does this)
3112 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3113 JVM_ACC_PRIVATE | \
3114 JVM_ACC_PROTECTED | \
3115 JVM_ACC_STATIC \
3116 )
3117
3118 // Return number of classes in the inner classes attribute table
3119 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3120 const u1* const inner_classes_attribute_start,
3121 bool parsed_enclosingmethod_attribute,
3122 u2 enclosing_method_class_index,
3123 u2 enclosing_method_method_index,
3124 TRAPS) {
3125 const u1* const current_mark = cfs->current();
3126 u2 length = 0;
3127 if (inner_classes_attribute_start != NULL) {
3128 cfs->set_current(inner_classes_attribute_start);
3129 cfs->guarantee_more(2, CHECK_0); // length
3130 length = cfs->get_u2_fast();
3131 }
3132
3133 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3134 // method data:
3135 // [inner_class_info_index,
3136 // outer_class_info_index,
3137 // inner_name_index,
3138 // inner_class_access_flags,
3139 // ...
3140 // enclosing_method_class_index,
3141 // enclosing_method_method_index]
3142 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3143 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3144 _inner_classes = inner_classes;
3145
3146 int index = 0;
3147 const int cp_size = _cp->length();
3148 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3149 for (int n = 0; n < length; n++) {
3150 // Inner class index
3151 const u2 inner_class_info_index = cfs->get_u2_fast();
3152 check_property(
3153 valid_klass_reference_at(inner_class_info_index),
3154 "inner_class_info_index %u has bad constant type in class file %s",
3155 inner_class_info_index, CHECK_0);
3156 // Outer class index
3157 const u2 outer_class_info_index = cfs->get_u2_fast();
3158 check_property(
3159 outer_class_info_index == 0 ||
3160 valid_klass_reference_at(outer_class_info_index),
3161 "outer_class_info_index %u has bad constant type in class file %s",
3162 outer_class_info_index, CHECK_0);
3163 // Inner class name
3164 const u2 inner_name_index = cfs->get_u2_fast();
3165 check_property(
3166 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3167 "inner_name_index %u has bad constant type in class file %s",
3168 inner_name_index, CHECK_0);
3169 if (_need_verify) {
3170 guarantee_property(inner_class_info_index != outer_class_info_index,
3171 "Class is both outer and inner class in class file %s", CHECK_0);
3172 }
3173 // Access flags
3174 jint flags;
3175 // JVM_ACC_MODULE is defined in JDK-9 and later.
3176 if (_major_version >= JAVA_9_VERSION) {
3177 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3178 } else {
3179 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3180 }
3181 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3182 // Set abstract bit for old class files for backward compatibility
3183 flags |= JVM_ACC_ABSTRACT;
3184 }
3185 verify_legal_class_modifiers(flags, CHECK_0);
3186 AccessFlags inner_access_flags(flags);
3187
3188 inner_classes->at_put(index++, inner_class_info_index);
3189 inner_classes->at_put(index++, outer_class_info_index);
3190 inner_classes->at_put(index++, inner_name_index);
3191 inner_classes->at_put(index++, inner_access_flags.as_short());
3192 }
3193
3194 // 4347400: make sure there's no duplicate entry in the classes array
3195 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3196 for(int i = 0; i < length * 4; i += 4) {
3197 for(int j = i + 4; j < length * 4; j += 4) {
3198 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3199 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3200 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3201 inner_classes->at(i+3) != inner_classes->at(j+3)),
3202 "Duplicate entry in InnerClasses in class file %s",
3203 CHECK_0);
3204 }
3205 }
3206 }
3207
3208 // Set EnclosingMethod class and method indexes.
3209 if (parsed_enclosingmethod_attribute) {
3210 inner_classes->at_put(index++, enclosing_method_class_index);
3211 inner_classes->at_put(index++, enclosing_method_method_index);
3212 }
3213 assert(index == size, "wrong size");
3214
3215 // Restore buffer's current position.
3216 cfs->set_current(current_mark);
3217
3218 return length;
3219 }
3220
3221 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3222 set_class_synthetic_flag(true);
3223 }
3224
3225 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3226 assert(cfs != NULL, "invariant");
3227
3228 const u2 signature_index = cfs->get_u2(CHECK);
3229 check_property(
3230 valid_symbol_at(signature_index),
3231 "Invalid constant pool index %u in Signature attribute in class file %s",
3232 signature_index, CHECK);
3233 set_class_generic_signature_index(signature_index);
3234 }
3235
3236 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3237 ConstantPool* cp,
3238 u4 attribute_byte_length,
3239 TRAPS) {
3240 assert(cfs != NULL, "invariant");
3241 assert(cp != NULL, "invariant");
3242
3243 const u1* const current_start = cfs->current();
3244
3245 guarantee_property(attribute_byte_length >= sizeof(u2),
3246 "Invalid BootstrapMethods attribute length %u in class file %s",
3247 attribute_byte_length,
3248 CHECK);
3249
3250 cfs->guarantee_more(attribute_byte_length, CHECK);
3251
3252 const int attribute_array_length = cfs->get_u2_fast();
3253
3254 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3255 "Short length on BootstrapMethods in class file %s",
3256 CHECK);
3257
3258
3259 // The attribute contains a counted array of counted tuples of shorts,
3260 // represending bootstrap specifiers:
3261 // length*{bootstrap_method_index, argument_count*{argument_index}}
3262 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3263 // operand_count = number of shorts in attr, except for leading length
3264
3265 // The attribute is copied into a short[] array.
3266 // The array begins with a series of short[2] pairs, one for each tuple.
3267 const int index_size = (attribute_array_length * 2);
3268
3269 Array<u2>* const operands =
3270 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3271
3272 // Eagerly assign operands so they will be deallocated with the constant
3273 // pool if there is an error.
3274 cp->set_operands(operands);
3275
3276 int operand_fill_index = index_size;
3277 const int cp_size = cp->length();
3278
3279 for (int n = 0; n < attribute_array_length; n++) {
3280 // Store a 32-bit offset into the header of the operand array.
3281 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3282
3283 // Read a bootstrap specifier.
3284 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3285 const u2 bootstrap_method_index = cfs->get_u2_fast();
3286 const u2 argument_count = cfs->get_u2_fast();
3287 check_property(
3288 valid_cp_range(bootstrap_method_index, cp_size) &&
3289 cp->tag_at(bootstrap_method_index).is_method_handle(),
3290 "bootstrap_method_index %u has bad constant type in class file %s",
3291 bootstrap_method_index,
3292 CHECK);
3293
3294 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3295 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3296 CHECK);
3297
3298 operands->at_put(operand_fill_index++, bootstrap_method_index);
3299 operands->at_put(operand_fill_index++, argument_count);
3300
3301 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3302 for (int j = 0; j < argument_count; j++) {
3303 const u2 argument_index = cfs->get_u2_fast();
3304 check_property(
3305 valid_cp_range(argument_index, cp_size) &&
3306 cp->tag_at(argument_index).is_loadable_constant(),
3307 "argument_index %u has bad constant type in class file %s",
3308 argument_index,
3309 CHECK);
3310 operands->at_put(operand_fill_index++, argument_index);
3311 }
3312 }
3313 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3314 "Bad length on BootstrapMethods in class file %s",
3315 CHECK);
3316 }
3317
3318 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3319 ConstantPool* cp,
3320 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3321 TRAPS) {
3322 assert(cfs != NULL, "invariant");
3323 assert(cp != NULL, "invariant");
3324 assert(parsed_annotations != NULL, "invariant");
3325
3326 // Set inner classes attribute to default sentinel
3327 _inner_classes = Universe::the_empty_short_array();
3328 cfs->guarantee_more(2, CHECK); // attributes_count
3329 u2 attributes_count = cfs->get_u2_fast();
3330 bool parsed_sourcefile_attribute = false;
3331 bool parsed_innerclasses_attribute = false;
3332 bool parsed_enclosingmethod_attribute = false;
3333 bool parsed_bootstrap_methods_attribute = false;
3334 const u1* runtime_visible_annotations = NULL;
3335 int runtime_visible_annotations_length = 0;
3336 const u1* runtime_invisible_annotations = NULL;
3337 int runtime_invisible_annotations_length = 0;
3338 const u1* runtime_visible_type_annotations = NULL;
3339 int runtime_visible_type_annotations_length = 0;
3340 const u1* runtime_invisible_type_annotations = NULL;
3341 int runtime_invisible_type_annotations_length = 0;
3342 bool runtime_invisible_type_annotations_exists = false;
3343 bool runtime_invisible_annotations_exists = false;
3344 bool parsed_source_debug_ext_annotations_exist = false;
3345 const u1* inner_classes_attribute_start = NULL;
3346 u4 inner_classes_attribute_length = 0;
3347 u2 enclosing_method_class_index = 0;
3348 u2 enclosing_method_method_index = 0;
3349 // Iterate over attributes
3350 while (attributes_count--) {
3351 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3352 const u2 attribute_name_index = cfs->get_u2_fast();
3353 const u4 attribute_length = cfs->get_u4_fast();
3354 check_property(
3355 valid_symbol_at(attribute_name_index),
3356 "Attribute name has bad constant pool index %u in class file %s",
3357 attribute_name_index, CHECK);
3358 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3359 if (tag == vmSymbols::tag_source_file()) {
3360 // Check for SourceFile tag
3361 if (_need_verify) {
3362 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3363 }
3364 if (parsed_sourcefile_attribute) {
3365 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3366 } else {
3367 parsed_sourcefile_attribute = true;
3368 }
3369 parse_classfile_sourcefile_attribute(cfs, CHECK);
3370 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3371 // Check for SourceDebugExtension tag
3372 if (parsed_source_debug_ext_annotations_exist) {
3373 classfile_parse_error(
3374 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3375 }
3376 parsed_source_debug_ext_annotations_exist = true;
3377 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3378 } else if (tag == vmSymbols::tag_inner_classes()) {
3379 // Check for InnerClasses tag
3380 if (parsed_innerclasses_attribute) {
3381 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3382 } else {
3383 parsed_innerclasses_attribute = true;
3384 }
3385 inner_classes_attribute_start = cfs->current();
3386 inner_classes_attribute_length = attribute_length;
3387 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3388 } else if (tag == vmSymbols::tag_synthetic()) {
3389 // Check for Synthetic tag
3390 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3391 if (attribute_length != 0) {
3392 classfile_parse_error(
3393 "Invalid Synthetic classfile attribute length %u in class file %s",
3394 attribute_length, CHECK);
3395 }
3396 parse_classfile_synthetic_attribute(CHECK);
3397 } else if (tag == vmSymbols::tag_deprecated()) {
3398 // Check for Deprecatd tag - 4276120
3399 if (attribute_length != 0) {
3400 classfile_parse_error(
3401 "Invalid Deprecated classfile attribute length %u in class file %s",
3402 attribute_length, CHECK);
3403 }
3404 } else if (_major_version >= JAVA_1_5_VERSION) {
3405 if (tag == vmSymbols::tag_signature()) {
3406 if (_generic_signature_index != 0) {
3407 classfile_parse_error(
3408 "Multiple Signature attributes in class file %s", CHECK);
3409 }
3410 if (attribute_length != 2) {
3411 classfile_parse_error(
3412 "Wrong Signature attribute length %u in class file %s",
3413 attribute_length, CHECK);
3414 }
3415 parse_classfile_signature_attribute(cfs, CHECK);
3416 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3417 if (runtime_visible_annotations != NULL) {
3418 classfile_parse_error(
3419 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3420 }
3421 runtime_visible_annotations_length = attribute_length;
3422 runtime_visible_annotations = cfs->current();
3423 assert(runtime_visible_annotations != NULL, "null visible annotations");
3424 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3425 parse_annotations(cp,
3426 runtime_visible_annotations,
3427 runtime_visible_annotations_length,
3428 parsed_annotations,
3429 _loader_data,
3430 CHECK);
3431 cfs->skip_u1_fast(runtime_visible_annotations_length);
3432 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3433 if (runtime_invisible_annotations_exists) {
3434 classfile_parse_error(
3435 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3436 }
3437 runtime_invisible_annotations_exists = true;
3438 if (PreserveAllAnnotations) {
3439 runtime_invisible_annotations_length = attribute_length;
3440 runtime_invisible_annotations = cfs->current();
3441 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3442 }
3443 cfs->skip_u1(attribute_length, CHECK);
3444 } else if (tag == vmSymbols::tag_enclosing_method()) {
3445 if (parsed_enclosingmethod_attribute) {
3446 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3447 } else {
3448 parsed_enclosingmethod_attribute = true;
3449 }
3450 guarantee_property(attribute_length == 4,
3451 "Wrong EnclosingMethod attribute length %u in class file %s",
3452 attribute_length, CHECK);
3453 cfs->guarantee_more(4, CHECK); // class_index, method_index
3454 enclosing_method_class_index = cfs->get_u2_fast();
3455 enclosing_method_method_index = cfs->get_u2_fast();
3456 if (enclosing_method_class_index == 0) {
3457 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3458 }
3459 // Validate the constant pool indices and types
3460 check_property(valid_klass_reference_at(enclosing_method_class_index),
3461 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3462 if (enclosing_method_method_index != 0 &&
3463 (!cp->is_within_bounds(enclosing_method_method_index) ||
3464 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3465 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3466 }
3467 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3468 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3469 if (parsed_bootstrap_methods_attribute) {
3470 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3471 }
3472 parsed_bootstrap_methods_attribute = true;
3473 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3474 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3475 if (runtime_visible_type_annotations != NULL) {
3476 classfile_parse_error(
3477 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3478 }
3479 runtime_visible_type_annotations_length = attribute_length;
3480 runtime_visible_type_annotations = cfs->current();
3481 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3482 // No need for the VM to parse Type annotations
3483 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3484 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3485 if (runtime_invisible_type_annotations_exists) {
3486 classfile_parse_error(
3487 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3488 } else {
3489 runtime_invisible_type_annotations_exists = true;
3490 }
3491 if (PreserveAllAnnotations) {
3492 runtime_invisible_type_annotations_length = attribute_length;
3493 runtime_invisible_type_annotations = cfs->current();
3494 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3495 }
3496 cfs->skip_u1(attribute_length, CHECK);
3497 } else {
3498 // Unknown attribute
3499 cfs->skip_u1(attribute_length, CHECK);
3500 }
3501 } else {
3502 // Unknown attribute
3503 cfs->skip_u1(attribute_length, CHECK);
3504 }
3505 }
3506 _annotations = assemble_annotations(runtime_visible_annotations,
3507 runtime_visible_annotations_length,
3508 runtime_invisible_annotations,
3509 runtime_invisible_annotations_length,
3510 CHECK);
3511 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3512 runtime_visible_type_annotations_length,
3513 runtime_invisible_type_annotations,
3514 runtime_invisible_type_annotations_length,
3515 CHECK);
3516
3517 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3518 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3519 cfs,
3520 inner_classes_attribute_start,
3521 parsed_innerclasses_attribute,
3522 enclosing_method_class_index,
3523 enclosing_method_method_index,
3524 CHECK);
3525 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3526 guarantee_property(
3527 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3528 "Wrong InnerClasses attribute length in class file %s", CHECK);
3529 }
3530 }
3531
3532 if (_max_bootstrap_specifier_index >= 0) {
3533 guarantee_property(parsed_bootstrap_methods_attribute,
3534 "Missing BootstrapMethods attribute in class file %s", CHECK);
3535 }
3536 }
3537
3538 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3539 assert(k != NULL, "invariant");
3540
3541 if (_synthetic_flag)
3542 k->set_is_synthetic();
3543 if (_sourcefile_index != 0) {
3544 k->set_source_file_name_index(_sourcefile_index);
3545 }
3546 if (_generic_signature_index != 0) {
3547 k->set_generic_signature_index(_generic_signature_index);
3548 }
3549 if (_sde_buffer != NULL) {
3550 k->set_source_debug_extension(_sde_buffer, _sde_length);
3551 }
3552 }
3553
3554 // Create the Annotations object that will
3555 // hold the annotations array for the Klass.
3556 void ClassFileParser::create_combined_annotations(TRAPS) {
3557 if (_annotations == NULL &&
3558 _type_annotations == NULL &&
3559 _fields_annotations == NULL &&
3560 _fields_type_annotations == NULL) {
3561 // Don't create the Annotations object unnecessarily.
3562 return;
3563 }
3564
3565 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3566 annotations->set_class_annotations(_annotations);
3567 annotations->set_class_type_annotations(_type_annotations);
3568 annotations->set_fields_annotations(_fields_annotations);
3569 annotations->set_fields_type_annotations(_fields_type_annotations);
3570
3571 // This is the Annotations object that will be
3572 // assigned to InstanceKlass being constructed.
3573 _combined_annotations = annotations;
3574
3575 // The annotations arrays below has been transfered the
3576 // _combined_annotations so these fields can now be cleared.
3577 _annotations = NULL;
3578 _type_annotations = NULL;
3579 _fields_annotations = NULL;
3580 _fields_type_annotations = NULL;
3581 }
3582
3583 // Transfer ownership of metadata allocated to the InstanceKlass.
3584 void ClassFileParser::apply_parsed_class_metadata(
3585 InstanceKlass* this_klass,
3586 int java_fields_count, TRAPS) {
3587 assert(this_klass != NULL, "invariant");
3588
3589 _cp->set_pool_holder(this_klass);
3590 this_klass->set_constants(_cp);
3591 this_klass->set_fields(_fields, java_fields_count);
3592 this_klass->set_methods(_methods);
3593 this_klass->set_inner_classes(_inner_classes);
3594 this_klass->set_local_interfaces(_local_interfaces);
3595 this_klass->set_transitive_interfaces(_transitive_interfaces);
3596 this_klass->set_annotations(_combined_annotations);
3597
3598 // Clear out these fields so they don't get deallocated by the destructor
3599 clear_class_metadata();
3600 }
3601
3602 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3603 int runtime_visible_annotations_length,
3604 const u1* const runtime_invisible_annotations,
3605 int runtime_invisible_annotations_length,
3606 TRAPS) {
3607 AnnotationArray* annotations = NULL;
3608 if (runtime_visible_annotations != NULL ||
3609 runtime_invisible_annotations != NULL) {
3610 annotations = MetadataFactory::new_array<u1>(_loader_data,
3611 runtime_visible_annotations_length +
3612 runtime_invisible_annotations_length,
3613 CHECK_(annotations));
3614 if (runtime_visible_annotations != NULL) {
3615 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3616 annotations->at_put(i, runtime_visible_annotations[i]);
3617 }
3618 }
3619 if (runtime_invisible_annotations != NULL) {
3620 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3621 int append = runtime_visible_annotations_length+i;
3622 annotations->at_put(append, runtime_invisible_annotations[i]);
3623 }
3624 }
3625 }
3626 return annotations;
3627 }
3628
3629 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3630 const int super_class_index,
3631 const bool need_verify,
3632 TRAPS) {
3633 assert(cp != NULL, "invariant");
3634 const InstanceKlass* super_klass = NULL;
3635
3636 if (super_class_index == 0) {
3637 check_property(_class_name == vmSymbols::java_lang_Object(),
3638 "Invalid superclass index %u in class file %s",
3639 super_class_index,
3640 CHECK_NULL);
3641 } else {
3642 check_property(valid_klass_reference_at(super_class_index),
3643 "Invalid superclass index %u in class file %s",
3644 super_class_index,
3645 CHECK_NULL);
3646 // The class name should be legal because it is checked when parsing constant pool.
3647 // However, make sure it is not an array type.
3648 bool is_array = false;
3649 if (cp->tag_at(super_class_index).is_klass()) {
3650 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3651 if (need_verify)
3652 is_array = super_klass->is_array_klass();
3653 } else if (need_verify) {
3654 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3655 }
3656 if (need_verify) {
3657 guarantee_property(!is_array,
3658 "Bad superclass name in class file %s", CHECK_NULL);
3659 }
3660 }
3661 return super_klass;
3662 }
3663
3664 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3665 unsigned int nonstatic_oop_map_count,
3666 int first_nonstatic_oop_offset) {
3667
3668 unsigned int map_count =
3669 NULL == super ? 0 : super->nonstatic_oop_map_count();
3670 if (nonstatic_oop_map_count > 0) {
3671 // We have oops to add to map
3672 if (map_count == 0) {
3673 map_count = nonstatic_oop_map_count;
3674 }
3675 else {
3676 // Check whether we should add a new map block or whether the last one can
3677 // be extended
3678 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3679 const OopMapBlock* const last_map = first_map + map_count - 1;
3680
3681 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3682 if (next_offset == first_nonstatic_oop_offset) {
3683 // There is no gap bettwen superklass's last oop field and first
3684 // local oop field, merge maps.
3685 nonstatic_oop_map_count -= 1;
3686 }
3687 else {
3688 // Superklass didn't end with a oop field, add extra maps
3689 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3690 }
3691 map_count += nonstatic_oop_map_count;
3692 }
3693 }
3694 return map_count;
3695 }
3696
3697 #ifndef PRODUCT
3698 static void print_field_layout(const Symbol* name,
3699 Array<u2>* fields,
3700 const constantPoolHandle& cp,
3701 int instance_size,
3702 int instance_fields_start,
3703 int instance_fields_end,
3704 int static_fields_end) {
3705
3706 assert(name != NULL, "invariant");
3707
3708 tty->print("%s: field layout\n", name->as_klass_external_name());
3709 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3710 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3711 if (!fs.access_flags().is_static()) {
3712 tty->print(" @%3d \"%s\" %s\n",
3713 fs.offset(),
3714 fs.name()->as_klass_external_name(),
3715 fs.signature()->as_klass_external_name());
3716 }
3717 }
3718 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3719 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3720 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3721 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3722 if (fs.access_flags().is_static()) {
3723 tty->print(" @%3d \"%s\" %s\n",
3724 fs.offset(),
3725 fs.name()->as_klass_external_name(),
3726 fs.signature()->as_klass_external_name());
3727 }
3728 }
3729 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3730 tty->print("\n");
3731 }
3732 #endif
3733
3734 // Values needed for oopmap and InstanceKlass creation
3735 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3736 public:
3737 int* nonstatic_oop_offsets;
3738 unsigned int* nonstatic_oop_counts;
3739 unsigned int nonstatic_oop_map_count;
3740 unsigned int total_oop_map_count;
3741 int instance_size;
3742 int nonstatic_field_size;
3743 int static_field_size;
3744 bool has_nonstatic_fields;
3745 };
3746
3747 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3748 void ClassFileParser::layout_fields(ConstantPool* cp,
3749 const FieldAllocationCount* fac,
3750 const ClassAnnotationCollector* parsed_annotations,
3751 FieldLayoutInfo* info,
3752 TRAPS) {
3753
3754 assert(cp != NULL, "invariant");
3755
3756 // Field size and offset computation
3757 int nonstatic_field_size = _super_klass == NULL ? 0 :
3758 _super_klass->nonstatic_field_size();
3759
3760 // Count the contended fields by type.
3761 //
3762 // We ignore static fields, because @Contended is not supported for them.
3763 // The layout code below will also ignore the static fields.
3764 int nonstatic_contended_count = 0;
3765 FieldAllocationCount fac_contended;
3766 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3767 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3768 if (fs.is_contended()) {
3769 fac_contended.count[atype]++;
3770 if (!fs.access_flags().is_static()) {
3771 nonstatic_contended_count++;
3772 }
3773 }
3774 }
3775
3776
3777 // Calculate the starting byte offsets
3778 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3779 int next_static_double_offset = next_static_oop_offset +
3780 ((fac->count[STATIC_OOP]) * heapOopSize);
3781 if (fac->count[STATIC_DOUBLE]) {
3782 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3783 }
3784
3785 int next_static_word_offset = next_static_double_offset +
3786 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3787 int next_static_short_offset = next_static_word_offset +
3788 ((fac->count[STATIC_WORD]) * BytesPerInt);
3789 int next_static_byte_offset = next_static_short_offset +
3790 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3791
3792 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3793 nonstatic_field_size * heapOopSize;
3794
3795 int next_nonstatic_field_offset = nonstatic_fields_start;
3796
3797 const bool is_contended_class = parsed_annotations->is_contended();
3798
3799 // Class is contended, pad before all the fields
3800 if (is_contended_class) {
3801 next_nonstatic_field_offset += ContendedPaddingWidth;
3802 }
3803
3804 // Compute the non-contended fields count.
3805 // The packing code below relies on these counts to determine if some field
3806 // can be squeezed into the alignment gap. Contended fields are obviously
3807 // exempt from that.
3808 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3809 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3810 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3811 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3812 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3813
3814 // Total non-static fields count, including every contended field
3815 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3816 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3817 fac->count[NONSTATIC_OOP];
3818
3819 const bool super_has_nonstatic_fields =
3820 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3821 const bool has_nonstatic_fields =
3822 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3823
3824
3825 // Prepare list of oops for oop map generation.
3826 //
3827 // "offset" and "count" lists are describing the set of contiguous oop
3828 // regions. offset[i] is the start of the i-th region, which then has
3829 // count[i] oops following. Before we know how many regions are required,
3830 // we pessimistically allocate the maps to fit all the oops into the
3831 // distinct regions.
3832 //
3833 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3834 // to figure out if we still need to do this.
3835 unsigned int nonstatic_oop_map_count = 0;
3836 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3837
3838 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3839 THREAD, int, max_nonstatic_oop_maps);
3840 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3841 THREAD, unsigned int, max_nonstatic_oop_maps);
3842
3843 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3844
3845 bool compact_fields = CompactFields;
3846 int allocation_style = FieldsAllocationStyle;
3847 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3848 assert(false, "0 <= FieldsAllocationStyle <= 2");
3849 allocation_style = 1; // Optimistic
3850 }
3851
3852 // The next classes have predefined hard-coded fields offsets
3853 // (see in JavaClasses::compute_hard_coded_offsets()).
3854 // Use default fields allocation order for them.
3855 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3856 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3857 _class_name == vmSymbols::java_lang_Class() ||
3858 _class_name == vmSymbols::java_lang_ClassLoader() ||
3859 _class_name == vmSymbols::java_lang_ref_Reference() ||
3860 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3861 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3862 _class_name == vmSymbols::java_lang_String() ||
3863 _class_name == vmSymbols::java_lang_Throwable() ||
3864 _class_name == vmSymbols::java_lang_Boolean() ||
3865 _class_name == vmSymbols::java_lang_Character() ||
3866 _class_name == vmSymbols::java_lang_Float() ||
3867 _class_name == vmSymbols::java_lang_Double() ||
3868 _class_name == vmSymbols::java_lang_Byte() ||
3869 _class_name == vmSymbols::java_lang_Short() ||
3870 _class_name == vmSymbols::java_lang_Integer() ||
3871 _class_name == vmSymbols::java_lang_Long())) {
3872 allocation_style = 0; // Allocate oops first
3873 compact_fields = false; // Don't compact fields
3874 }
3875
3876 int next_nonstatic_oop_offset = 0;
3877 int next_nonstatic_double_offset = 0;
3878
3879 // Rearrange fields for a given allocation style
3880 if( allocation_style == 0 ) {
3881 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3882 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3883 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3884 (nonstatic_oop_count * heapOopSize);
3885 } else if( allocation_style == 1 ) {
3886 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3887 next_nonstatic_double_offset = next_nonstatic_field_offset;
3888 } else if( allocation_style == 2 ) {
3889 // Fields allocation: oops fields in super and sub classes are together.
3890 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3891 _super_klass->nonstatic_oop_map_size() > 0 ) {
3892 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3893 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3894 const OopMapBlock* const last_map = first_map + map_count - 1;
3895 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3896 if (next_offset == next_nonstatic_field_offset) {
3897 allocation_style = 0; // allocate oops first
3898 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3899 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3900 (nonstatic_oop_count * heapOopSize);
3901 }
3902 }
3903 if( allocation_style == 2 ) {
3904 allocation_style = 1; // allocate oops last
3905 next_nonstatic_double_offset = next_nonstatic_field_offset;
3906 }
3907 } else {
3908 ShouldNotReachHere();
3909 }
3910
3911 int nonstatic_oop_space_count = 0;
3912 int nonstatic_word_space_count = 0;
3913 int nonstatic_short_space_count = 0;
3914 int nonstatic_byte_space_count = 0;
3915 int nonstatic_oop_space_offset = 0;
3916 int nonstatic_word_space_offset = 0;
3917 int nonstatic_short_space_offset = 0;
3918 int nonstatic_byte_space_offset = 0;
3919
3920 // Try to squeeze some of the fields into the gaps due to
3921 // long/double alignment.
3922 if (nonstatic_double_count > 0) {
3923 int offset = next_nonstatic_double_offset;
3924 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3925 if (compact_fields && offset != next_nonstatic_double_offset) {
3926 // Allocate available fields into the gap before double field.
3927 int length = next_nonstatic_double_offset - offset;
3928 assert(length == BytesPerInt, "");
3929 nonstatic_word_space_offset = offset;
3930 if (nonstatic_word_count > 0) {
3931 nonstatic_word_count -= 1;
3932 nonstatic_word_space_count = 1; // Only one will fit
3933 length -= BytesPerInt;
3934 offset += BytesPerInt;
3935 }
3936 nonstatic_short_space_offset = offset;
3937 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3938 nonstatic_short_count -= 1;
3939 nonstatic_short_space_count += 1;
3940 length -= BytesPerShort;
3941 offset += BytesPerShort;
3942 }
3943 nonstatic_byte_space_offset = offset;
3944 while (length > 0 && nonstatic_byte_count > 0) {
3945 nonstatic_byte_count -= 1;
3946 nonstatic_byte_space_count += 1;
3947 length -= 1;
3948 }
3949 // Allocate oop field in the gap if there are no other fields for that.
3950 nonstatic_oop_space_offset = offset;
3951 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3952 allocation_style != 0) { // when oop fields not first
3953 nonstatic_oop_count -= 1;
3954 nonstatic_oop_space_count = 1; // Only one will fit
3955 length -= heapOopSize;
3956 offset += heapOopSize;
3957 }
3958 }
3959 }
3960
3961 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3962 (nonstatic_double_count * BytesPerLong);
3963 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3964 (nonstatic_word_count * BytesPerInt);
3965 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3966 (nonstatic_short_count * BytesPerShort);
3967 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3968 nonstatic_byte_count;
3969
3970 // let oops jump before padding with this allocation style
3971 if( allocation_style == 1 ) {
3972 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3973 if( nonstatic_oop_count > 0 ) {
3974 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
3975 }
3976 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3977 }
3978
3979 // Iterate over fields again and compute correct offsets.
3980 // The field allocation type was temporarily stored in the offset slot.
3981 // oop fields are located before non-oop fields (static and non-static).
3982 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3983
3984 // skip already laid out fields
3985 if (fs.is_offset_set()) continue;
3986
3987 // contended instance fields are handled below
3988 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3989
3990 int real_offset = 0;
3991 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
3992
3993 // pack the rest of the fields
3994 switch (atype) {
3995 case STATIC_OOP:
3996 real_offset = next_static_oop_offset;
3997 next_static_oop_offset += heapOopSize;
3998 break;
3999 case STATIC_BYTE:
4000 real_offset = next_static_byte_offset;
4001 next_static_byte_offset += 1;
4002 break;
4003 case STATIC_SHORT:
4004 real_offset = next_static_short_offset;
4005 next_static_short_offset += BytesPerShort;
4006 break;
4007 case STATIC_WORD:
4008 real_offset = next_static_word_offset;
4009 next_static_word_offset += BytesPerInt;
4010 break;
4011 case STATIC_DOUBLE:
4012 real_offset = next_static_double_offset;
4013 next_static_double_offset += BytesPerLong;
4014 break;
4015 case NONSTATIC_OOP:
4016 if( nonstatic_oop_space_count > 0 ) {
4017 real_offset = nonstatic_oop_space_offset;
4018 nonstatic_oop_space_offset += heapOopSize;
4019 nonstatic_oop_space_count -= 1;
4020 } else {
4021 real_offset = next_nonstatic_oop_offset;
4022 next_nonstatic_oop_offset += heapOopSize;
4023 }
4024
4025 // Record this oop in the oop maps
4026 if( nonstatic_oop_map_count > 0 &&
4027 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4028 real_offset -
4029 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4030 heapOopSize ) {
4031 // This oop is adjacent to the previous one, add to current oop map
4032 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4033 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4034 } else {
4035 // This oop is not adjacent to the previous one, create new oop map
4036 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4037 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4038 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4039 nonstatic_oop_map_count += 1;
4040 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4041 first_nonstatic_oop_offset = real_offset;
4042 }
4043 }
4044 break;
4045 case NONSTATIC_BYTE:
4046 if( nonstatic_byte_space_count > 0 ) {
4047 real_offset = nonstatic_byte_space_offset;
4048 nonstatic_byte_space_offset += 1;
4049 nonstatic_byte_space_count -= 1;
4050 } else {
4051 real_offset = next_nonstatic_byte_offset;
4052 next_nonstatic_byte_offset += 1;
4053 }
4054 break;
4055 case NONSTATIC_SHORT:
4056 if( nonstatic_short_space_count > 0 ) {
4057 real_offset = nonstatic_short_space_offset;
4058 nonstatic_short_space_offset += BytesPerShort;
4059 nonstatic_short_space_count -= 1;
4060 } else {
4061 real_offset = next_nonstatic_short_offset;
4062 next_nonstatic_short_offset += BytesPerShort;
4063 }
4064 break;
4065 case NONSTATIC_WORD:
4066 if( nonstatic_word_space_count > 0 ) {
4067 real_offset = nonstatic_word_space_offset;
4068 nonstatic_word_space_offset += BytesPerInt;
4069 nonstatic_word_space_count -= 1;
4070 } else {
4071 real_offset = next_nonstatic_word_offset;
4072 next_nonstatic_word_offset += BytesPerInt;
4073 }
4074 break;
4075 case NONSTATIC_DOUBLE:
4076 real_offset = next_nonstatic_double_offset;
4077 next_nonstatic_double_offset += BytesPerLong;
4078 break;
4079 default:
4080 ShouldNotReachHere();
4081 }
4082 fs.set_offset(real_offset);
4083 }
4084
4085
4086 // Handle the contended cases.
4087 //
4088 // Each contended field should not intersect the cache line with another contended field.
4089 // In the absence of alignment information, we end up with pessimistically separating
4090 // the fields with full-width padding.
4091 //
4092 // Additionally, this should not break alignment for the fields, so we round the alignment up
4093 // for each field.
4094 if (nonstatic_contended_count > 0) {
4095
4096 // if there is at least one contended field, we need to have pre-padding for them
4097 next_nonstatic_padded_offset += ContendedPaddingWidth;
4098
4099 // collect all contended groups
4100 ResourceBitMap bm(cp->size());
4101 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4102 // skip already laid out fields
4103 if (fs.is_offset_set()) continue;
4104
4105 if (fs.is_contended()) {
4106 bm.set_bit(fs.contended_group());
4107 }
4108 }
4109
4110 int current_group = -1;
4111 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4112
4113 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4114
4115 // skip already laid out fields
4116 if (fs.is_offset_set()) continue;
4117
4118 // skip non-contended fields and fields from different group
4119 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4120
4121 // handle statics below
4122 if (fs.access_flags().is_static()) continue;
4123
4124 int real_offset = 0;
4125 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4126
4127 switch (atype) {
4128 case NONSTATIC_BYTE:
4129 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4130 real_offset = next_nonstatic_padded_offset;
4131 next_nonstatic_padded_offset += 1;
4132 break;
4133
4134 case NONSTATIC_SHORT:
4135 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4136 real_offset = next_nonstatic_padded_offset;
4137 next_nonstatic_padded_offset += BytesPerShort;
4138 break;
4139
4140 case NONSTATIC_WORD:
4141 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4142 real_offset = next_nonstatic_padded_offset;
4143 next_nonstatic_padded_offset += BytesPerInt;
4144 break;
4145
4146 case NONSTATIC_DOUBLE:
4147 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4148 real_offset = next_nonstatic_padded_offset;
4149 next_nonstatic_padded_offset += BytesPerLong;
4150 break;
4151
4152 case NONSTATIC_OOP:
4153 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4154 real_offset = next_nonstatic_padded_offset;
4155 next_nonstatic_padded_offset += heapOopSize;
4156
4157 // Record this oop in the oop maps
4158 if( nonstatic_oop_map_count > 0 &&
4159 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4160 real_offset -
4161 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4162 heapOopSize ) {
4163 // This oop is adjacent to the previous one, add to current oop map
4164 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4165 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4166 } else {
4167 // This oop is not adjacent to the previous one, create new oop map
4168 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4169 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4170 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4171 nonstatic_oop_map_count += 1;
4172 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4173 first_nonstatic_oop_offset = real_offset;
4174 }
4175 }
4176 break;
4177
4178 default:
4179 ShouldNotReachHere();
4180 }
4181
4182 if (fs.contended_group() == 0) {
4183 // Contended group defines the equivalence class over the fields:
4184 // the fields within the same contended group are not inter-padded.
4185 // The only exception is default group, which does not incur the
4186 // equivalence, and so requires intra-padding.
4187 next_nonstatic_padded_offset += ContendedPaddingWidth;
4188 }
4189
4190 fs.set_offset(real_offset);
4191 } // for
4192
4193 // Start laying out the next group.
4194 // Note that this will effectively pad the last group in the back;
4195 // this is expected to alleviate memory contention effects for
4196 // subclass fields and/or adjacent object.
4197 // If this was the default group, the padding is already in place.
4198 if (current_group != 0) {
4199 next_nonstatic_padded_offset += ContendedPaddingWidth;
4200 }
4201 }
4202
4203 // handle static fields
4204 }
4205
4206 // Entire class is contended, pad in the back.
4207 // This helps to alleviate memory contention effects for subclass fields
4208 // and/or adjacent object.
4209 if (is_contended_class) {
4210 next_nonstatic_padded_offset += ContendedPaddingWidth;
4211 }
4212
4213 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4214
4215 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4216 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4217 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4218
4219 int static_field_size = (static_fields_end -
4220 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4221 nonstatic_field_size = nonstatic_field_size +
4222 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4223
4224 int instance_size = align_object_size(instance_end / wordSize);
4225
4226 assert(instance_size == align_object_size(align_up(
4227 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4228 wordSize) / wordSize), "consistent layout helper value");
4229
4230 // Invariant: nonstatic_field end/start should only change if there are
4231 // nonstatic fields in the class, or if the class is contended. We compare
4232 // against the non-aligned value, so that end alignment will not fail the
4233 // assert without actually having the fields.
4234 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4235 is_contended_class ||
4236 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4237
4238 // Number of non-static oop map blocks allocated at end of klass.
4239 const unsigned int total_oop_map_count =
4240 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4241 first_nonstatic_oop_offset);
4242
4243 #ifndef PRODUCT
4244 if (PrintFieldLayout) {
4245 print_field_layout(_class_name,
4246 _fields,
4247 cp,
4248 instance_size,
4249 nonstatic_fields_start,
4250 nonstatic_fields_end,
4251 static_fields_end);
4252 }
4253
4254 #endif
4255 // Pass back information needed for InstanceKlass creation
4256 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4257 info->nonstatic_oop_counts = nonstatic_oop_counts;
4258 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4259 info->total_oop_map_count = total_oop_map_count;
4260 info->instance_size = instance_size;
4261 info->static_field_size = static_field_size;
4262 info->nonstatic_field_size = nonstatic_field_size;
4263 info->has_nonstatic_fields = has_nonstatic_fields;
4264 }
4265
4266 static void fill_oop_maps(const InstanceKlass* k,
4267 unsigned int nonstatic_oop_map_count,
4268 const int* nonstatic_oop_offsets,
4269 const unsigned int* nonstatic_oop_counts) {
4270
4271 assert(k != NULL, "invariant");
4272
4273 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4274 const InstanceKlass* const super = k->superklass();
4275 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4276 if (super_count > 0) {
4277 // Copy maps from superklass
4278 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4279 for (unsigned int i = 0; i < super_count; ++i) {
4280 *this_oop_map++ = *super_oop_map++;
4281 }
4282 }
4283
4284 if (nonstatic_oop_map_count > 0) {
4285 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4286 // The counts differ because there is no gap between superklass's last oop
4287 // field and the first local oop field. Extend the last oop map copied
4288 // from the superklass instead of creating new one.
4289 nonstatic_oop_map_count--;
4290 nonstatic_oop_offsets++;
4291 this_oop_map--;
4292 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4293 this_oop_map++;
4294 }
4295
4296 // Add new map blocks, fill them
4297 while (nonstatic_oop_map_count-- > 0) {
4298 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4299 this_oop_map->set_count(*nonstatic_oop_counts++);
4300 this_oop_map++;
4301 }
4302 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4303 this_oop_map, "sanity");
4304 }
4305 }
4306
4307
4308 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4309 assert(ik != NULL, "invariant");
4310
4311 const Klass* const super = ik->super();
4312
4313 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4314 // in which case we don't have to register objects as finalizable
4315 if (!_has_empty_finalizer) {
4316 if (_has_finalizer ||
4317 (super != NULL && super->has_finalizer())) {
4318 ik->set_has_finalizer();
4319 }
4320 }
4321
4322 #ifdef ASSERT
4323 bool f = false;
4324 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4325 vmSymbols::void_method_signature());
4326 if (m != NULL && !m->is_empty_method()) {
4327 f = true;
4328 }
4329
4330 // Spec doesn't prevent agent from redefinition of empty finalizer.
4331 // Despite the fact that it's generally bad idea and redefined finalizer
4332 // will not work as expected we shouldn't abort vm in this case
4333 if (!ik->has_redefined_this_or_super()) {
4334 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4335 }
4336 #endif
4337
4338 // Check if this klass supports the java.lang.Cloneable interface
4339 if (SystemDictionary::Cloneable_klass_loaded()) {
4340 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4341 ik->set_is_cloneable();
4342 }
4343 }
4344
4345 // Check if this klass has a vanilla default constructor
4346 if (super == NULL) {
4347 // java.lang.Object has empty default constructor
4348 ik->set_has_vanilla_constructor();
4349 } else {
4350 if (super->has_vanilla_constructor() &&
4351 _has_vanilla_constructor) {
4352 ik->set_has_vanilla_constructor();
4353 }
4354 #ifdef ASSERT
4355 bool v = false;
4356 if (super->has_vanilla_constructor()) {
4357 const Method* const constructor =
4358 ik->find_method(vmSymbols::object_initializer_name(),
4359 vmSymbols::void_method_signature());
4360 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4361 v = true;
4362 }
4363 }
4364 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4365 #endif
4366 }
4367
4368 // If it cannot be fast-path allocated, set a bit in the layout helper.
4369 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4370 assert(ik->size_helper() > 0, "layout_helper is initialized");
4371 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4372 || ik->is_abstract() || ik->is_interface()
4373 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4374 || ik->size_helper() >= FastAllocateSizeLimit) {
4375 // Forbid fast-path allocation.
4376 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4377 ik->set_layout_helper(lh);
4378 }
4379 }
4380
4381 // Attach super classes and interface classes to class loader data
4382 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4383 TRAPS) {
4384 assert(defined_klass != NULL, "invariant");
4385
4386 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4387 if (defining_loader_data->is_the_null_class_loader_data()) {
4388 // Dependencies to null class loader data are implicit.
4389 return;
4390 } else {
4391 // add super class dependency
4392 Klass* const super = defined_klass->super();
4393 if (super != NULL) {
4394 defining_loader_data->record_dependency(super);
4395 }
4396
4397 // add super interface dependencies
4398 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4399 if (local_interfaces != NULL) {
4400 const int length = local_interfaces->length();
4401 for (int i = 0; i < length; i++) {
4402 defining_loader_data->record_dependency(local_interfaces->at(i));
4403 }
4404 }
4405 }
4406 }
4407
4408 // utility methods for appending an array with check for duplicates
4409
4410 static void append_interfaces(GrowableArray<Klass*>* result,
4411 const Array<Klass*>* const ifs) {
4412 // iterate over new interfaces
4413 for (int i = 0; i < ifs->length(); i++) {
4414 Klass* const e = ifs->at(i);
4415 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4416 // add new interface
4417 result->append_if_missing(e);
4418 }
4419 }
4420
4421 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4422 Array<Klass*>* local_ifs,
4423 ClassLoaderData* loader_data,
4424 TRAPS) {
4425 assert(local_ifs != NULL, "invariant");
4426 assert(loader_data != NULL, "invariant");
4427
4428 // Compute maximum size for transitive interfaces
4429 int max_transitive_size = 0;
4430 int super_size = 0;
4431 // Add superclass transitive interfaces size
4432 if (super != NULL) {
4433 super_size = super->transitive_interfaces()->length();
4434 max_transitive_size += super_size;
4435 }
4436 // Add local interfaces' super interfaces
4437 const int local_size = local_ifs->length();
4438 for (int i = 0; i < local_size; i++) {
4439 Klass* const l = local_ifs->at(i);
4440 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4441 }
4442 // Finally add local interfaces
4443 max_transitive_size += local_size;
4444 // Construct array
4445 if (max_transitive_size == 0) {
4446 // no interfaces, use canonicalized array
4447 return Universe::the_empty_klass_array();
4448 } else if (max_transitive_size == super_size) {
4449 // no new local interfaces added, share superklass' transitive interface array
4450 return super->transitive_interfaces();
4451 } else if (max_transitive_size == local_size) {
4452 // only local interfaces added, share local interface array
4453 return local_ifs;
4454 } else {
4455 ResourceMark rm;
4456 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4457
4458 // Copy down from superclass
4459 if (super != NULL) {
4460 append_interfaces(result, super->transitive_interfaces());
4461 }
4462
4463 // Copy down from local interfaces' superinterfaces
4464 for (int i = 0; i < local_size; i++) {
4465 Klass* const l = local_ifs->at(i);
4466 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4467 }
4468 // Finally add local interfaces
4469 append_interfaces(result, local_ifs);
4470
4471 // length will be less than the max_transitive_size if duplicates were removed
4472 const int length = result->length();
4473 assert(length <= max_transitive_size, "just checking");
4474 Array<Klass*>* const new_result =
4475 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4476 for (int i = 0; i < length; i++) {
4477 Klass* const e = result->at(i);
4478 assert(e != NULL, "just checking");
4479 new_result->at_put(i, e);
4480 }
4481 return new_result;
4482 }
4483 }
4484
4485 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4486 assert(this_klass != NULL, "invariant");
4487 const Klass* const super = this_klass->super();
4488 if (super != NULL) {
4489
4490 // If the loader is not the boot loader then throw an exception if its
4491 // superclass is in package jdk.internal.reflect and its loader is not a
4492 // special reflection class loader
4493 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4494 assert(super->is_instance_klass(), "super is not instance klass");
4495 PackageEntry* super_package = super->package();
4496 if (super_package != NULL &&
4497 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4498 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4499 ResourceMark rm(THREAD);
4500 Exceptions::fthrow(
4501 THREAD_AND_LOCATION,
4502 vmSymbols::java_lang_IllegalAccessError(),
4503 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4504 this_klass->external_name(),
4505 this_klass->class_loader_data()->loader_name(),
4506 super->external_name());
4507 return;
4508 }
4509 }
4510
4511 Reflection::VerifyClassAccessResults vca_result =
4512 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4513 if (vca_result != Reflection::ACCESS_OK) {
4514 ResourceMark rm(THREAD);
4515 char* msg = Reflection::verify_class_access_msg(this_klass,
4516 InstanceKlass::cast(super),
4517 vca_result);
4518 if (msg == NULL) {
4519 Exceptions::fthrow(
4520 THREAD_AND_LOCATION,
4521 vmSymbols::java_lang_IllegalAccessError(),
4522 "class %s cannot access its superclass %s",
4523 this_klass->external_name(),
4524 super->external_name());
4525 } else {
4526 // Add additional message content.
4527 Exceptions::fthrow(
4528 THREAD_AND_LOCATION,
4529 vmSymbols::java_lang_IllegalAccessError(),
4530 "superclass access check failed: %s",
4531 msg);
4532 }
4533 }
4534 }
4535 }
4536
4537
4538 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4539 assert(this_klass != NULL, "invariant");
4540 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4541 const int lng = local_interfaces->length();
4542 for (int i = lng - 1; i >= 0; i--) {
4543 Klass* const k = local_interfaces->at(i);
4544 assert (k != NULL && k->is_interface(), "invalid interface");
4545 Reflection::VerifyClassAccessResults vca_result =
4546 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4547 if (vca_result != Reflection::ACCESS_OK) {
4548 ResourceMark rm(THREAD);
4549 char* msg = Reflection::verify_class_access_msg(this_klass,
4550 InstanceKlass::cast(k),
4551 vca_result);
4552 if (msg == NULL) {
4553 Exceptions::fthrow(
4554 THREAD_AND_LOCATION,
4555 vmSymbols::java_lang_IllegalAccessError(),
4556 "class %s cannot access its superinterface %s",
4557 this_klass->external_name(),
4558 k->external_name());
4559 } else {
4560 // Add additional message content.
4561 Exceptions::fthrow(
4562 THREAD_AND_LOCATION,
4563 vmSymbols::java_lang_IllegalAccessError(),
4564 "superinterface check failed: %s",
4565 msg);
4566 }
4567 }
4568 }
4569 }
4570
4571
4572 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4573 assert(this_klass != NULL, "invariant");
4574 const Array<Method*>* const methods = this_klass->methods();
4575 const int num_methods = methods->length();
4576
4577 // go thru each method and check if it overrides a final method
4578 for (int index = 0; index < num_methods; index++) {
4579 const Method* const m = methods->at(index);
4580
4581 // skip private, static, and <init> methods
4582 if ((!m->is_private() && !m->is_static()) &&
4583 (m->name() != vmSymbols::object_initializer_name())) {
4584
4585 const Symbol* const name = m->name();
4586 const Symbol* const signature = m->signature();
4587 const Klass* k = this_klass->super();
4588 const Method* super_m = NULL;
4589 while (k != NULL) {
4590 // skip supers that don't have final methods.
4591 if (k->has_final_method()) {
4592 // lookup a matching method in the super class hierarchy
4593 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4594 if (super_m == NULL) {
4595 break; // didn't find any match; get out
4596 }
4597
4598 if (super_m->is_final() && !super_m->is_static() &&
4599 // matching method in super is final, and not static
4600 (Reflection::verify_field_access(this_klass,
4601 super_m->method_holder(),
4602 super_m->method_holder(),
4603 super_m->access_flags(), false))
4604 // this class can access super final method and therefore override
4605 ) {
4606 ResourceMark rm(THREAD);
4607 Exceptions::fthrow(
4608 THREAD_AND_LOCATION,
4609 vmSymbols::java_lang_VerifyError(),
4610 "class %s overrides final method %s.%s%s",
4611 this_klass->external_name(),
4612 super_m->method_holder()->external_name(),
4613 name->as_C_string(),
4614 signature->as_C_string()
4615 );
4616 return;
4617 }
4618
4619 // continue to look from super_m's holder's super.
4620 k = super_m->method_holder()->super();
4621 continue;
4622 }
4623
4624 k = k->super();
4625 }
4626 }
4627 }
4628 }
4629
4630
4631 // assumes that this_klass is an interface
4632 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4633 assert(this_klass != NULL, "invariant");
4634 assert(this_klass->is_interface(), "not an interface");
4635 const Array<Method*>* methods = this_klass->methods();
4636 const int num_methods = methods->length();
4637
4638 for (int index = 0; index < num_methods; index++) {
4639 const Method* const m = methods->at(index);
4640 // if m is static and not the init method, throw a verify error
4641 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4642 ResourceMark rm(THREAD);
4643 Exceptions::fthrow(
4644 THREAD_AND_LOCATION,
4645 vmSymbols::java_lang_VerifyError(),
4646 "Illegal static method %s in interface %s",
4647 m->name()->as_C_string(),
4648 this_klass->external_name()
4649 );
4650 return;
4651 }
4652 }
4653 }
4654
4655 // utility methods for format checking
4656
4657 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4658 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4659 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4660 if (is_module) {
4661 ResourceMark rm(THREAD);
4662 Exceptions::fthrow(
4663 THREAD_AND_LOCATION,
4664 vmSymbols::java_lang_NoClassDefFoundError(),
4665 "%s is not a class because access_flag ACC_MODULE is set",
4666 _class_name->as_C_string());
4667 return;
4668 }
4669
4670 if (!_need_verify) { return; }
4671
4672 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4673 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4674 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4675 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4676 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4677 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4678 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4679
4680 if ((is_abstract && is_final) ||
4681 (is_interface && !is_abstract) ||
4682 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4683 (!is_interface && major_gte_15 && is_annotation)) {
4684 ResourceMark rm(THREAD);
4685 Exceptions::fthrow(
4686 THREAD_AND_LOCATION,
4687 vmSymbols::java_lang_ClassFormatError(),
4688 "Illegal class modifiers in class %s: 0x%X",
4689 _class_name->as_C_string(), flags
4690 );
4691 return;
4692 }
4693 }
4694
4695 static bool has_illegal_visibility(jint flags) {
4696 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4697 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4698 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4699
4700 return ((is_public && is_protected) ||
4701 (is_public && is_private) ||
4702 (is_protected && is_private));
4703 }
4704
4705 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4706 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4707 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
4708 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4709 if (major != max_version) {
4710 ResourceMark rm(THREAD);
4711 Exceptions::fthrow(
4712 THREAD_AND_LOCATION,
4713 vmSymbols::java_lang_UnsupportedClassVersionError(),
4714 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4715 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4716 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4717 return;
4718 }
4719
4720 if (!Arguments::enable_preview()) {
4721 ResourceMark rm(THREAD);
4722 Exceptions::fthrow(
4723 THREAD_AND_LOCATION,
4724 vmSymbols::java_lang_UnsupportedClassVersionError(),
4725 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4726 class_name->as_C_string(), major, minor);
4727 return;
4728 }
4729
4730 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4731 if (major > max_version) {
4732 ResourceMark rm(THREAD);
4733 Exceptions::fthrow(
4734 THREAD_AND_LOCATION,
4735 vmSymbols::java_lang_UnsupportedClassVersionError(),
4736 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4737 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4738 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4739 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
4740 ResourceMark rm(THREAD);
4741 Exceptions::fthrow(
4742 THREAD_AND_LOCATION,
4743 vmSymbols::java_lang_UnsupportedClassVersionError(),
4744 "%s (class file version %u.%u) was compiled with an invalid major version",
4745 class_name->as_C_string(), major, minor);
4746 } else if (minor != 0) {
4747 ResourceMark rm(THREAD);
4748 Exceptions::fthrow(
4749 THREAD_AND_LOCATION,
4750 vmSymbols::java_lang_UnsupportedClassVersionError(),
4751 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4752 class_name->as_C_string(), major, minor);
4753 }
4754 }
4755 }
4756 }
4757
4758 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4759 bool is_interface,
4760 TRAPS) const {
4761 if (!_need_verify) { return; }
4762
4763 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4764 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4765 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4766 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4767 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4768 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4769 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4770 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4771 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4772
4773 bool is_illegal = false;
4774
4775 if (is_interface) {
4776 if (!is_public || !is_static || !is_final || is_private ||
4777 is_protected || is_volatile || is_transient ||
4778 (major_gte_15 && is_enum)) {
4779 is_illegal = true;
4780 }
4781 } else { // not interface
4782 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4783 is_illegal = true;
4784 }
4785 }
4786
4787 if (is_illegal) {
4788 ResourceMark rm(THREAD);
4789 Exceptions::fthrow(
4790 THREAD_AND_LOCATION,
4791 vmSymbols::java_lang_ClassFormatError(),
4792 "Illegal field modifiers in class %s: 0x%X",
4793 _class_name->as_C_string(), flags);
4794 return;
4795 }
4796 }
4797
4798 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4799 bool is_interface,
4800 const Symbol* name,
4801 TRAPS) const {
4802 if (!_need_verify) { return; }
4803
4804 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4805 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4806 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4807 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4808 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4809 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4810 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4811 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4812 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4813 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4814 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4815 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4816 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4817
4818 bool is_illegal = false;
4819
4820 if (is_interface) {
4821 if (major_gte_8) {
4822 // Class file version is JAVA_8_VERSION or later Methods of
4823 // interfaces may set any of the flags except ACC_PROTECTED,
4824 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4825 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4826 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4827 (is_native || is_protected || is_final || is_synchronized) ||
4828 // If a specific method of a class or interface has its
4829 // ACC_ABSTRACT flag set, it must not have any of its
4830 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4831 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4832 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4833 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4834 (is_abstract && (is_private || is_static || is_strict))) {
4835 is_illegal = true;
4836 }
4837 } else if (major_gte_15) {
4838 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4839 if (!is_public || is_private || is_protected || is_static || is_final ||
4840 is_synchronized || is_native || !is_abstract || is_strict) {
4841 is_illegal = true;
4842 }
4843 } else {
4844 // Class file version is pre-JAVA_1_5_VERSION
4845 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4846 is_illegal = true;
4847 }
4848 }
4849 } else { // not interface
4850 if (has_illegal_visibility(flags)) {
4851 is_illegal = true;
4852 } else {
4853 if (is_initializer) {
4854 if (is_static || is_final || is_synchronized || is_native ||
4855 is_abstract || (major_gte_15 && is_bridge)) {
4856 is_illegal = true;
4857 }
4858 } else { // not initializer
4859 if (is_abstract) {
4860 if ((is_final || is_native || is_private || is_static ||
4861 (major_gte_15 && (is_synchronized || is_strict)))) {
4862 is_illegal = true;
4863 }
4864 }
4865 }
4866 }
4867 }
4868
4869 if (is_illegal) {
4870 ResourceMark rm(THREAD);
4871 Exceptions::fthrow(
4872 THREAD_AND_LOCATION,
4873 vmSymbols::java_lang_ClassFormatError(),
4874 "Method %s in class %s has illegal modifiers: 0x%X",
4875 name->as_C_string(), _class_name->as_C_string(), flags);
4876 return;
4877 }
4878 }
4879
4880 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4881 int length,
4882 TRAPS) const {
4883 assert(_need_verify, "only called when _need_verify is true");
4884 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4885 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4886 }
4887 }
4888
4889 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4890 // In class names, '/' separates unqualified names. This is verified in this function also.
4891 // Method names also may not contain the characters '<' or '>', unless <init>
4892 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4893 // method. Because these names have been checked as special cases before
4894 // calling this method in verify_legal_method_name.
4895 //
4896 // This method is also called from the modular system APIs in modules.cpp
4897 // to verify the validity of module and package names.
4898 bool ClassFileParser::verify_unqualified_name(const char* name,
4899 unsigned int length,
4900 int type) {
4901 for (const char* p = name; p != name + length;) {
4902 jchar ch = *p;
4903 if (ch < 128) {
4904 if (ch == '.' || ch == ';' || ch == '[' ) {
4905 return false; // do not permit '.', ';', or '['
4906 }
4907 if (ch == '/') {
4908 // check for '//' or leading or trailing '/' which are not legal
4909 // unqualified name must not be empty
4910 if (type == ClassFileParser::LegalClass) {
4911 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4912 return false;
4913 }
4914 } else {
4915 return false; // do not permit '/' unless it's class name
4916 }
4917 }
4918 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4919 return false; // do not permit '<' or '>' in method names
4920 }
4921 p++;
4922 } else {
4923 char* tmp_p = UTF8::next(p, &ch);
4924 p = tmp_p;
4925 }
4926 }
4927 return true;
4928 }
4929
4930 // Take pointer to a string. Skip over the longest part of the string that could
4931 // be taken as a fieldname. Allow '/' if slash_ok is true.
4932 // Return a pointer to just past the fieldname.
4933 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4934 // being true, we saw consecutive slashes (meaning we were looking for a
4935 // qualified path but found something that was badly-formed).
4936 static const char* skip_over_field_name(const char* name,
4937 bool slash_ok,
4938 unsigned int length) {
4939 const char* p;
4940 jboolean last_is_slash = false;
4941 jboolean not_first_ch = false;
4942
4943 for (p = name; p != name + length; not_first_ch = true) {
4944 const char* old_p = p;
4945 jchar ch = *p;
4946 if (ch < 128) {
4947 p++;
4948 // quick check for ascii
4949 if ((ch >= 'a' && ch <= 'z') ||
4950 (ch >= 'A' && ch <= 'Z') ||
4951 (ch == '_' || ch == '$') ||
4952 (not_first_ch && ch >= '0' && ch <= '9')) {
4953 last_is_slash = false;
4954 continue;
4955 }
4956 if (slash_ok && ch == '/') {
4957 if (last_is_slash) {
4958 return NULL; // Don't permit consecutive slashes
4959 }
4960 last_is_slash = true;
4961 continue;
4962 }
4963 }
4964 else {
4965 jint unicode_ch;
4966 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4967 p = tmp_p;
4968 last_is_slash = false;
4969 // Check if ch is Java identifier start or is Java identifier part
4970 // 4672820: call java.lang.Character methods directly without generating separate tables.
4971 EXCEPTION_MARK;
4972
4973 // return value
4974 JavaValue result(T_BOOLEAN);
4975 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4976 JavaCallArguments args;
4977 args.push_int(unicode_ch);
4978
4979 // public static boolean isJavaIdentifierStart(char ch);
4980 JavaCalls::call_static(&result,
4981 SystemDictionary::Character_klass(),
4982 vmSymbols::isJavaIdentifierStart_name(),
4983 vmSymbols::int_bool_signature(),
4984 &args,
4985 THREAD);
4986
4987 if (HAS_PENDING_EXCEPTION) {
4988 CLEAR_PENDING_EXCEPTION;
4989 return 0;
4990 }
4991 if (result.get_jboolean()) {
4992 continue;
4993 }
4994
4995 if (not_first_ch) {
4996 // public static boolean isJavaIdentifierPart(char ch);
4997 JavaCalls::call_static(&result,
4998 SystemDictionary::Character_klass(),
4999 vmSymbols::isJavaIdentifierPart_name(),
5000 vmSymbols::int_bool_signature(),
5001 &args,
5002 THREAD);
5003
5004 if (HAS_PENDING_EXCEPTION) {
5005 CLEAR_PENDING_EXCEPTION;
5006 return 0;
5007 }
5008
5009 if (result.get_jboolean()) {
5010 continue;
5011 }
5012 }
5013 }
5014 return (not_first_ch) ? old_p : NULL;
5015 }
5016 return (not_first_ch) ? p : NULL;
5017 }
5018
5019 // Take pointer to a string. Skip over the longest part of the string that could
5020 // be taken as a field signature. Allow "void" if void_ok.
5021 // Return a pointer to just past the signature.
5022 // Return NULL if no legal signature is found.
5023 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5024 bool void_ok,
5025 unsigned int length,
5026 TRAPS) const {
5027 unsigned int array_dim = 0;
5028 while (length > 0) {
5029 switch (signature[0]) {
5030 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5031 case JVM_SIGNATURE_BOOLEAN:
5032 case JVM_SIGNATURE_BYTE:
5033 case JVM_SIGNATURE_CHAR:
5034 case JVM_SIGNATURE_SHORT:
5035 case JVM_SIGNATURE_INT:
5036 case JVM_SIGNATURE_FLOAT:
5037 case JVM_SIGNATURE_LONG:
5038 case JVM_SIGNATURE_DOUBLE:
5039 return signature + 1;
5040 case JVM_SIGNATURE_CLASS: {
5041 if (_major_version < JAVA_1_5_VERSION) {
5042 // Skip over the class name if one is there
5043 const char* const p = skip_over_field_name(signature + 1, true, --length);
5044
5045 // The next character better be a semicolon
5046 if (p && (p - signature) > 1 && p[0] == ';') {
5047 return p + 1;
5048 }
5049 }
5050 else {
5051 // Skip leading 'L' and ignore first appearance of ';'
5052 length--;
5053 signature++;
5054 char* c = strchr((char*) signature, ';');
5055 // Format check signature
5056 if (c != NULL) {
5057 ResourceMark rm(THREAD);
5058 int newlen = c - (char*) signature;
5059 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5060 strncpy(sig, signature, newlen);
5061 sig[newlen] = '\0';
5062
5063 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5064 if (!legal) {
5065 classfile_parse_error("Class name contains illegal character "
5066 "in descriptor in class file %s",
5067 CHECK_0);
5068 return NULL;
5069 }
5070 return signature + newlen + 1;
5071 }
5072 }
5073 return NULL;
5074 }
5075 case JVM_SIGNATURE_ARRAY:
5076 array_dim++;
5077 if (array_dim > 255) {
5078 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5079 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5080 }
5081 // The rest of what's there better be a legal signature
5082 signature++;
5083 length--;
5084 void_ok = false;
5085 break;
5086 default:
5087 return NULL;
5088 }
5089 }
5090 return NULL;
5091 }
5092
5093 // Checks if name is a legal class name.
5094 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5095 if (!_need_verify || _relax_verify) { return; }
5096
5097 char buf[fixed_buffer_size];
5098 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5099 unsigned int length = name->utf8_length();
5100 bool legal = false;
5101
5102 if (length > 0) {
5103 const char* p;
5104 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5105 p = skip_over_field_signature(bytes, false, length, CHECK);
5106 legal = (p != NULL) && ((p - bytes) == (int)length);
5107 } else if (_major_version < JAVA_1_5_VERSION) {
5108 if (bytes[0] != '<') {
5109 p = skip_over_field_name(bytes, true, length);
5110 legal = (p != NULL) && ((p - bytes) == (int)length);
5111 }
5112 } else {
5113 // 4900761: relax the constraints based on JSR202 spec
5114 // Class names may be drawn from the entire Unicode character set.
5115 // Identifiers between '/' must be unqualified names.
5116 // The utf8 string has been verified when parsing cpool entries.
5117 legal = verify_unqualified_name(bytes, length, LegalClass);
5118 }
5119 }
5120 if (!legal) {
5121 ResourceMark rm(THREAD);
5122 assert(_class_name != NULL, "invariant");
5123 Exceptions::fthrow(
5124 THREAD_AND_LOCATION,
5125 vmSymbols::java_lang_ClassFormatError(),
5126 "Illegal class name \"%s\" in class file %s", bytes,
5127 _class_name->as_C_string()
5128 );
5129 return;
5130 }
5131 }
5132
5133 // Checks if name is a legal field name.
5134 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5135 if (!_need_verify || _relax_verify) { return; }
5136
5137 char buf[fixed_buffer_size];
5138 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5139 unsigned int length = name->utf8_length();
5140 bool legal = false;
5141
5142 if (length > 0) {
5143 if (_major_version < JAVA_1_5_VERSION) {
5144 if (bytes[0] != '<') {
5145 const char* p = skip_over_field_name(bytes, false, length);
5146 legal = (p != NULL) && ((p - bytes) == (int)length);
5147 }
5148 } else {
5149 // 4881221: relax the constraints based on JSR202 spec
5150 legal = verify_unqualified_name(bytes, length, LegalField);
5151 }
5152 }
5153
5154 if (!legal) {
5155 ResourceMark rm(THREAD);
5156 assert(_class_name != NULL, "invariant");
5157 Exceptions::fthrow(
5158 THREAD_AND_LOCATION,
5159 vmSymbols::java_lang_ClassFormatError(),
5160 "Illegal field name \"%s\" in class %s", bytes,
5161 _class_name->as_C_string()
5162 );
5163 return;
5164 }
5165 }
5166
5167 // Checks if name is a legal method name.
5168 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5169 if (!_need_verify || _relax_verify) { return; }
5170
5171 assert(name != NULL, "method name is null");
5172 char buf[fixed_buffer_size];
5173 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5174 unsigned int length = name->utf8_length();
5175 bool legal = false;
5176
5177 if (length > 0) {
5178 if (bytes[0] == '<') {
5179 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5180 legal = true;
5181 }
5182 } else if (_major_version < JAVA_1_5_VERSION) {
5183 const char* p;
5184 p = skip_over_field_name(bytes, false, length);
5185 legal = (p != NULL) && ((p - bytes) == (int)length);
5186 } else {
5187 // 4881221: relax the constraints based on JSR202 spec
5188 legal = verify_unqualified_name(bytes, length, LegalMethod);
5189 }
5190 }
5191
5192 if (!legal) {
5193 ResourceMark rm(THREAD);
5194 assert(_class_name != NULL, "invariant");
5195 Exceptions::fthrow(
5196 THREAD_AND_LOCATION,
5197 vmSymbols::java_lang_ClassFormatError(),
5198 "Illegal method name \"%s\" in class %s", bytes,
5199 _class_name->as_C_string()
5200 );
5201 return;
5202 }
5203 }
5204
5205
5206 // Checks if signature is a legal field signature.
5207 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5208 const Symbol* signature,
5209 TRAPS) const {
5210 if (!_need_verify) { return; }
5211
5212 char buf[fixed_buffer_size];
5213 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5214 const unsigned int length = signature->utf8_length();
5215 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5216
5217 if (p == NULL || (p - bytes) != (int)length) {
5218 throwIllegalSignature("Field", name, signature, CHECK);
5219 }
5220 }
5221
5222 // Checks if signature is a legal method signature.
5223 // Returns number of parameters
5224 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5225 const Symbol* signature,
5226 TRAPS) const {
5227 if (!_need_verify) {
5228 // make sure caller's args_size will be less than 0 even for non-static
5229 // method so it will be recomputed in compute_size_of_parameters().
5230 return -2;
5231 }
5232
5233 // Class initializers cannot have args for class format version >= 51.
5234 if (name == vmSymbols::class_initializer_name() &&
5235 signature != vmSymbols::void_method_signature() &&
5236 _major_version >= JAVA_7_VERSION) {
5237 throwIllegalSignature("Method", name, signature, CHECK_0);
5238 return 0;
5239 }
5240
5241 unsigned int args_size = 0;
5242 char buf[fixed_buffer_size];
5243 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5244 unsigned int length = signature->utf8_length();
5245 const char* nextp;
5246
5247 // The first character must be a '('
5248 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5249 length--;
5250 // Skip over legal field signatures
5251 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5252 while ((length > 0) && (nextp != NULL)) {
5253 args_size++;
5254 if (p[0] == 'J' || p[0] == 'D') {
5255 args_size++;
5256 }
5257 length -= nextp - p;
5258 p = nextp;
5259 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5260 }
5261 // The first non-signature thing better be a ')'
5262 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5263 length--;
5264 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5265 // All internal methods must return void
5266 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5267 return args_size;
5268 }
5269 } else {
5270 // Now we better just have a return value
5271 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5272 if (nextp && ((int)length == (nextp - p))) {
5273 return args_size;
5274 }
5275 }
5276 }
5277 }
5278 // Report error
5279 throwIllegalSignature("Method", name, signature, CHECK_0);
5280 return 0;
5281 }
5282
5283 int ClassFileParser::static_field_size() const {
5284 assert(_field_info != NULL, "invariant");
5285 return _field_info->static_field_size;
5286 }
5287
5288 int ClassFileParser::total_oop_map_count() const {
5289 assert(_field_info != NULL, "invariant");
5290 return _field_info->total_oop_map_count;
5291 }
5292
5293 jint ClassFileParser::layout_size() const {
5294 assert(_field_info != NULL, "invariant");
5295 return _field_info->instance_size;
5296 }
5297
5298 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5299 const Array<Method*>* methods) {
5300 assert(ik != NULL, "invariant");
5301 assert(methods != NULL, "invariant");
5302
5303 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5304 // (We used to do this lazily, but now we query it in Rewriter,
5305 // which is eagerly done for every method, so we might as well do it now,
5306 // when everything is fresh in memory.)
5307 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5308
5309 if (klass_id != vmSymbols::NO_SID) {
5310 for (int j = 0; j < methods->length(); ++j) {
5311 Method* method = methods->at(j);
5312 method->init_intrinsic_id();
5313
5314 if (CheckIntrinsics) {
5315 // Check if an intrinsic is defined for method 'method',
5316 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5317 if (method->intrinsic_id() != vmIntrinsics::_none &&
5318 !method->intrinsic_candidate()) {
5319 tty->print("Compiler intrinsic is defined for method [%s], "
5320 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5321 method->name_and_sig_as_C_string(),
5322 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5323 );
5324 tty->cr();
5325 DEBUG_ONLY(vm_exit(1));
5326 }
5327 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5328 // but there is no intrinsic available for it.
5329 if (method->intrinsic_candidate() &&
5330 method->intrinsic_id() == vmIntrinsics::_none) {
5331 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5332 "but no compiler intrinsic is defined for the method.%s",
5333 method->name_and_sig_as_C_string(),
5334 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5335 );
5336 tty->cr();
5337 DEBUG_ONLY(vm_exit(1));
5338 }
5339 }
5340 } // end for
5341
5342 #ifdef ASSERT
5343 if (CheckIntrinsics) {
5344 // Check for orphan methods in the current class. A method m
5345 // of a class C is orphan if an intrinsic is defined for method m,
5346 // but class C does not declare m.
5347 // The check is potentially expensive, therefore it is available
5348 // only in debug builds.
5349
5350 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5351 if (vmIntrinsics::_compiledLambdaForm == id) {
5352 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5353 // generated for the JVM from a LambdaForm and therefore no method
5354 // is defined for it.
5355 continue;
5356 }
5357
5358 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5359 // Check if the current class contains a method with the same
5360 // name, flags, signature.
5361 bool match = false;
5362 for (int j = 0; j < methods->length(); ++j) {
5363 const Method* method = methods->at(j);
5364 if (method->intrinsic_id() == id) {
5365 match = true;
5366 break;
5367 }
5368 }
5369
5370 if (!match) {
5371 char buf[1000];
5372 tty->print("Compiler intrinsic is defined for method [%s], "
5373 "but the method is not available in class [%s].%s",
5374 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5375 buf, sizeof(buf)),
5376 ik->name()->as_C_string(),
5377 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5378 );
5379 tty->cr();
5380 DEBUG_ONLY(vm_exit(1));
5381 }
5382 }
5383 } // end for
5384 } // CheckIntrinsics
5385 #endif // ASSERT
5386 }
5387 }
5388
5389 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5390 if (_klass != NULL) {
5391 return _klass;
5392 }
5393
5394 InstanceKlass* const ik =
5395 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5396
5397 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5398
5399 assert(_klass == ik, "invariant");
5400
5401 ik->set_has_passed_fingerprint_check(false);
5402 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5403 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5404 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5405 // This class matches with a class saved in an AOT library
5406 ik->set_has_passed_fingerprint_check(true);
5407 } else {
5408 ResourceMark rm;
5409 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5410 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5411 }
5412 }
5413
5414 return ik;
5415 }
5416
5417 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5418 assert(ik != NULL, "invariant");
5419
5420 // Set name and CLD before adding to CLD
5421 ik->set_class_loader_data(_loader_data);
5422 ik->set_name(_class_name);
5423
5424 // Add all classes to our internal class loader list here,
5425 // including classes in the bootstrap (NULL) class loader.
5426 const bool publicize = !is_internal();
5427
5428 _loader_data->add_class(ik, publicize);
5429
5430 set_klass_to_deallocate(ik);
5431
5432 assert(_field_info != NULL, "invariant");
5433 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5434 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5435 "sanity");
5436
5437 assert(ik->is_instance_klass(), "sanity");
5438 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5439
5440 // Fill in information already parsed
5441 ik->set_should_verify_class(_need_verify);
5442
5443 // Not yet: supers are done below to support the new subtype-checking fields
5444 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5445 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5446 assert(_fac != NULL, "invariant");
5447 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5448
5449 // this transfers ownership of a lot of arrays from
5450 // the parser onto the InstanceKlass*
5451 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5452
5453 // note that is not safe to use the fields in the parser from this point on
5454 assert(NULL == _cp, "invariant");
5455 assert(NULL == _fields, "invariant");
5456 assert(NULL == _methods, "invariant");
5457 assert(NULL == _inner_classes, "invariant");
5458 assert(NULL == _local_interfaces, "invariant");
5459 assert(NULL == _transitive_interfaces, "invariant");
5460 assert(NULL == _combined_annotations, "invariant");
5461
5462 if (_has_final_method) {
5463 ik->set_has_final_method();
5464 }
5465
5466 ik->copy_method_ordering(_method_ordering, CHECK);
5467 // The InstanceKlass::_methods_jmethod_ids cache
5468 // is managed on the assumption that the initial cache
5469 // size is equal to the number of methods in the class. If
5470 // that changes, then InstanceKlass::idnum_can_increment()
5471 // has to be changed accordingly.
5472 ik->set_initial_method_idnum(ik->methods()->length());
5473
5474 if (is_anonymous()) {
5475 // _this_class_index is a CONSTANT_Class entry that refers to this
5476 // anonymous class itself. If this class needs to refer to its own methods or
5477 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5478 // _this_class_index. However, because this class is anonymous (it's
5479 // not stored in SystemDictionary), _this_class_index cannot be resolved
5480 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5481 // Therefore, we must eagerly resolve _this_class_index now.
5482 ik->constants()->klass_at_put(_this_class_index, ik);
5483 }
5484
5485 ik->set_minor_version(_minor_version);
5486 ik->set_major_version(_major_version);
5487 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5488 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5489
5490 if (_host_klass != NULL) {
5491 assert (ik->is_anonymous(), "should be the same");
5492 ik->set_host_klass(_host_klass);
5493 }
5494
5495 // Set PackageEntry for this_klass
5496 oop cl = ik->class_loader();
5497 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5498 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5499 ik->set_package(cld, CHECK);
5500
5501 const Array<Method*>* const methods = ik->methods();
5502 assert(methods != NULL, "invariant");
5503 const int methods_len = methods->length();
5504
5505 check_methods_for_intrinsics(ik, methods);
5506
5507 // Fill in field values obtained by parse_classfile_attributes
5508 if (_parsed_annotations->has_any_annotations()) {
5509 _parsed_annotations->apply_to(ik);
5510 }
5511
5512 apply_parsed_class_attributes(ik);
5513
5514 // Miranda methods
5515 if ((_num_miranda_methods > 0) ||
5516 // if this class introduced new miranda methods or
5517 (_super_klass != NULL && _super_klass->has_miranda_methods())
5518 // super class exists and this class inherited miranda methods
5519 ) {
5520 ik->set_has_miranda_methods(); // then set a flag
5521 }
5522
5523 // Fill in information needed to compute superclasses.
5524 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5525
5526 // Initialize itable offset tables
5527 klassItable::setup_itable_offset_table(ik);
5528
5529 // Compute transitive closure of interfaces this class implements
5530 // Do final class setup
5531 fill_oop_maps(ik,
5532 _field_info->nonstatic_oop_map_count,
5533 _field_info->nonstatic_oop_offsets,
5534 _field_info->nonstatic_oop_counts);
5535
5536 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5537 set_precomputed_flags(ik);
5538
5539 // check if this class can access its super class
5540 check_super_class_access(ik, CHECK);
5541
5542 // check if this class can access its superinterfaces
5543 check_super_interface_access(ik, CHECK);
5544
5545 // check if this class overrides any final method
5546 check_final_method_override(ik, CHECK);
5547
5548 // reject static interface methods prior to Java 8
5549 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5550 check_illegal_static_method(ik, CHECK);
5551 }
5552
5553 // Obtain this_klass' module entry
5554 ModuleEntry* module_entry = ik->module();
5555 assert(module_entry != NULL, "module_entry should always be set");
5556
5557 // Obtain java.lang.Module
5558 Handle module_handle(THREAD, module_entry->module());
5559
5560 // Allocate mirror and initialize static fields
5561 // The create_mirror() call will also call compute_modifiers()
5562 java_lang_Class::create_mirror(ik,
5563 Handle(THREAD, _loader_data->class_loader()),
5564 module_handle,
5565 _protection_domain,
5566 CHECK);
5567
5568 assert(_all_mirandas != NULL, "invariant");
5569
5570 // Generate any default methods - default methods are public interface methods
5571 // that have a default implementation. This is new with Java 8.
5572 if (_has_nonstatic_concrete_methods) {
5573 DefaultMethods::generate_default_methods(ik,
5574 _all_mirandas,
5575 CHECK);
5576 }
5577
5578 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5579 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5580 !module_entry->has_default_read_edges()) {
5581 if (!module_entry->set_has_default_read_edges()) {
5582 // We won a potential race
5583 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5584 }
5585 }
5586
5587 // Update the loader_data graph.
5588 record_defined_class_dependencies(ik, CHECK);
5589
5590 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5591
5592 if (!is_internal()) {
5593 if (log_is_enabled(Info, class, load)) {
5594 ResourceMark rm;
5595 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5596 ik->print_class_load_logging(_loader_data, module_name, _stream);
5597 }
5598
5599 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5600 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5601 log_is_enabled(Info, class, preview)) {
5602 ResourceMark rm;
5603 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
5604 }
5605
5606 if (log_is_enabled(Debug, class, resolve)) {
5607 ResourceMark rm;
5608 // print out the superclass.
5609 const char * from = ik->external_name();
5610 if (ik->java_super() != NULL) {
5611 log_debug(class, resolve)("%s %s (super)",
5612 from,
5613 ik->java_super()->external_name());
5614 }
5615 // print out each of the interface classes referred to by this class.
5616 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5617 if (local_interfaces != NULL) {
5618 const int length = local_interfaces->length();
5619 for (int i = 0; i < length; i++) {
5620 const Klass* const k = local_interfaces->at(i);
5621 const char * to = k->external_name();
5622 log_debug(class, resolve)("%s %s (interface)", from, to);
5623 }
5624 }
5625 }
5626 }
5627
5628 TRACE_INIT_ID(ik);
5629
5630 // If we reach here, all is well.
5631 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5632 // in order for it to not be destroyed in the ClassFileParser destructor.
5633 set_klass_to_deallocate(NULL);
5634
5635 // it's official
5636 set_klass(ik);
5637
5638 debug_only(ik->verify();)
5639 }
5640
5641 // For an anonymous class that is in the unnamed package, move it to its host class's
5642 // package by prepending its host class's package name to its class name and setting
5643 // its _class_name field.
5644 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5645 ResourceMark rm(THREAD);
5646 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5647 "Anonymous class should not be in a package");
5648 const char* host_pkg_name =
5649 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5650
5651 if (host_pkg_name != NULL) {
5652 size_t host_pkg_len = strlen(host_pkg_name);
5653 int class_name_len = _class_name->utf8_length();
5654 char* new_anon_name =
5655 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5656 // Copy host package name and trailing /.
5657 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5658 new_anon_name[host_pkg_len] = '/';
5659 // Append anonymous class name. The anonymous class name can contain odd
5660 // characters. So, do a strncpy instead of using sprintf("%s...").
5661 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5662
5663 // Create a symbol and update the anonymous class name.
5664 _class_name = SymbolTable::new_symbol(new_anon_name,
5665 (int)host_pkg_len + 1 + class_name_len,
5666 CHECK);
5667 }
5668 }
5669
5670 // If the host class and the anonymous class are in the same package then do
5671 // nothing. If the anonymous class is in the unnamed package then move it to its
5672 // host's package. If the classes are in different packages then throw an IAE
5673 // exception.
5674 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5675 assert(_host_klass != NULL, "Expected an anonymous class");
5676
5677 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5678 _class_name->utf8_length(), '/');
5679 if (anon_last_slash == NULL) { // Unnamed package
5680 prepend_host_package_name(_host_klass, CHECK);
5681 } else {
5682 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5683 ResourceMark rm(THREAD);
5684 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5685 err_msg("Host class %s and anonymous class %s are in different packages",
5686 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5687 }
5688 }
5689 }
5690
5691 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5692 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5693 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5694 bool need_verify =
5695 // verifyAll
5696 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5697 // verifyRemote
5698 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5699 return !need_verify;
5700 }
5701
5702 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5703 Symbol* name,
5704 ClassLoaderData* loader_data,
5705 Handle protection_domain,
5706 const InstanceKlass* host_klass,
5707 GrowableArray<Handle>* cp_patches,
5708 Publicity pub_level,
5709 TRAPS) :
5710 _stream(stream),
5711 _requested_name(name),
5712 _loader_data(loader_data),
5713 _host_klass(host_klass),
5714 _cp_patches(cp_patches),
5715 _num_patched_klasses(0),
5716 _max_num_patched_klasses(0),
5717 _orig_cp_size(0),
5718 _first_patched_klass_resolved_index(0),
5719 _super_klass(),
5720 _cp(NULL),
5721 _fields(NULL),
5722 _methods(NULL),
5723 _inner_classes(NULL),
5724 _local_interfaces(NULL),
5725 _transitive_interfaces(NULL),
5726 _combined_annotations(NULL),
5727 _annotations(NULL),
5728 _type_annotations(NULL),
5729 _fields_annotations(NULL),
5730 _fields_type_annotations(NULL),
5731 _klass(NULL),
5732 _klass_to_deallocate(NULL),
5733 _parsed_annotations(NULL),
5734 _fac(NULL),
5735 _field_info(NULL),
5736 _method_ordering(NULL),
5737 _all_mirandas(NULL),
5738 _vtable_size(0),
5739 _itable_size(0),
5740 _num_miranda_methods(0),
5741 _rt(REF_NONE),
5742 _protection_domain(protection_domain),
5743 _access_flags(),
5744 _pub_level(pub_level),
5745 _bad_constant_seen(0),
5746 _synthetic_flag(false),
5747 _sde_length(false),
5748 _sde_buffer(NULL),
5749 _sourcefile_index(0),
5750 _generic_signature_index(0),
5751 _major_version(0),
5752 _minor_version(0),
5753 _this_class_index(0),
5754 _super_class_index(0),
5755 _itfs_len(0),
5756 _java_fields_count(0),
5757 _need_verify(false),
5758 _relax_verify(false),
5759 _has_nonstatic_concrete_methods(false),
5760 _declares_nonstatic_concrete_methods(false),
5761 _has_final_method(false),
5762 _has_finalizer(false),
5763 _has_empty_finalizer(false),
5764 _has_vanilla_constructor(false),
5765 _max_bootstrap_specifier_index(-1) {
5766
5767 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5768
5769 assert(THREAD->is_Java_thread(), "invariant");
5770 assert(_loader_data != NULL, "invariant");
5771 assert(stream != NULL, "invariant");
5772 assert(_stream != NULL, "invariant");
5773 assert(_stream->buffer() == _stream->current(), "invariant");
5774 assert(_class_name != NULL, "invariant");
5775 assert(0 == _access_flags.as_int(), "invariant");
5776
5777 // Figure out whether we can skip format checking (matching classic VM behavior)
5778 if (DumpSharedSpaces) {
5779 // verify == true means it's a 'remote' class (i.e., non-boot class)
5780 // Verification decision is based on BytecodeVerificationRemote flag
5781 // for those classes.
5782 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5783 BytecodeVerificationLocal;
5784 }
5785 else {
5786 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5787 stream->need_verify());
5788 }
5789 if (_cp_patches != NULL) {
5790 int len = _cp_patches->length();
5791 for (int i=0; i<len; i++) {
5792 if (has_cp_patch_at(i)) {
5793 Handle patch = cp_patch_at(i);
5794 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5795 // We need to append the names of the patched classes to the end of the constant pool,
5796 // because a patched class may have a Utf8 name that's not already included in the
5797 // original constant pool. These class names are used when patch_constant_pool()
5798 // calls patch_class().
5799 //
5800 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5801 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5802 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5803 _max_num_patched_klasses++;
5804 }
5805 }
5806 }
5807 }
5808
5809 // synch back verification state to stream
5810 stream->set_verify(_need_verify);
5811
5812 // Check if verification needs to be relaxed for this class file
5813 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5814 _relax_verify = relax_format_check_for(_loader_data);
5815
5816 parse_stream(stream, CHECK);
5817
5818 post_process_parsed_stream(stream, _cp, CHECK);
5819 }
5820
5821 void ClassFileParser::clear_class_metadata() {
5822 // metadata created before the instance klass is created. Must be
5823 // deallocated if classfile parsing returns an error.
5824 _cp = NULL;
5825 _fields = NULL;
5826 _methods = NULL;
5827 _inner_classes = NULL;
5828 _local_interfaces = NULL;
5829 _transitive_interfaces = NULL;
5830 _combined_annotations = NULL;
5831 _annotations = _type_annotations = NULL;
5832 _fields_annotations = _fields_type_annotations = NULL;
5833 }
5834
5835 // Destructor to clean up
5836 ClassFileParser::~ClassFileParser() {
5837 if (_cp != NULL) {
5838 MetadataFactory::free_metadata(_loader_data, _cp);
5839 }
5840 if (_fields != NULL) {
5841 MetadataFactory::free_array<u2>(_loader_data, _fields);
5842 }
5843
5844 if (_methods != NULL) {
5845 // Free methods
5846 InstanceKlass::deallocate_methods(_loader_data, _methods);
5847 }
5848
5849 // beware of the Universe::empty_blah_array!!
5850 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5851 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5852 }
5853
5854 // Free interfaces
5855 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5856 _local_interfaces, _transitive_interfaces);
5857
5858 if (_combined_annotations != NULL) {
5859 // After all annotations arrays have been created, they are installed into the
5860 // Annotations object that will be assigned to the InstanceKlass being created.
5861
5862 // Deallocate the Annotations object and the installed annotations arrays.
5863 _combined_annotations->deallocate_contents(_loader_data);
5864
5865 // If the _combined_annotations pointer is non-NULL,
5866 // then the other annotations fields should have been cleared.
5867 assert(_annotations == NULL, "Should have been cleared");
5868 assert(_type_annotations == NULL, "Should have been cleared");
5869 assert(_fields_annotations == NULL, "Should have been cleared");
5870 assert(_fields_type_annotations == NULL, "Should have been cleared");
5871 } else {
5872 // If the annotations arrays were not installed into the Annotations object,
5873 // then they have to be deallocated explicitly.
5874 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5875 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5876 Annotations::free_contents(_loader_data, _fields_annotations);
5877 Annotations::free_contents(_loader_data, _fields_type_annotations);
5878 }
5879
5880 clear_class_metadata();
5881
5882 // deallocate the klass if already created. Don't directly deallocate, but add
5883 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5884 // at a safepoint.
5885 if (_klass_to_deallocate != NULL) {
5886 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5887 }
5888 }
5889
5890 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5891 TRAPS) {
5892
5893 assert(stream != NULL, "invariant");
5894 assert(_class_name != NULL, "invariant");
5895
5896 // BEGIN STREAM PARSING
5897 stream->guarantee_more(8, CHECK); // magic, major, minor
5898 // Magic value
5899 const u4 magic = stream->get_u4_fast();
5900 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5901 "Incompatible magic value %u in class file %s",
5902 magic, CHECK);
5903
5904 // Version numbers
5905 _minor_version = stream->get_u2_fast();
5906 _major_version = stream->get_u2_fast();
5907
5908 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5909 ResourceMark rm;
5910 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5911 _major_version, _minor_version, _class_name->as_C_string());
5912 Exceptions::fthrow(
5913 THREAD_AND_LOCATION,
5914 vmSymbols::java_lang_UnsupportedClassVersionError(),
5915 "Unsupported major.minor version for dump time %u.%u",
5916 _major_version,
5917 _minor_version);
5918 }
5919
5920 // Check version numbers - we check this even with verifier off
5921 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5922
5923 stream->guarantee_more(3, CHECK); // length, first cp tag
5924 u2 cp_size = stream->get_u2_fast();
5925
5926 guarantee_property(
5927 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5928 cp_size, CHECK);
5929
5930 _orig_cp_size = cp_size;
5931 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5932 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5933 }
5934 cp_size += _max_num_patched_klasses;
5935
5936 _cp = ConstantPool::allocate(_loader_data,
5937 cp_size,
5938 CHECK);
5939
5940 ConstantPool* const cp = _cp;
5941
5942 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5943
5944 assert(cp_size == (const u2)cp->length(), "invariant");
5945
5946 // ACCESS FLAGS
5947 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5948
5949 // Access flags
5950 jint flags;
5951 // JVM_ACC_MODULE is defined in JDK-9 and later.
5952 if (_major_version >= JAVA_9_VERSION) {
5953 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5954 } else {
5955 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5956 }
5957
5958 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5959 // Set abstract bit for old class files for backward compatibility
5960 flags |= JVM_ACC_ABSTRACT;
5961 }
5962
5963 verify_legal_class_modifiers(flags, CHECK);
5964
5965 short bad_constant = class_bad_constant_seen();
5966 if (bad_constant != 0) {
5967 // Do not throw CFE until after the access_flags are checked because if
5968 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5969 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5970 }
5971
5972 _access_flags.set_flags(flags);
5973
5974 // This class and superclass
5975 _this_class_index = stream->get_u2_fast();
5976 check_property(
5977 valid_cp_range(_this_class_index, cp_size) &&
5978 cp->tag_at(_this_class_index).is_unresolved_klass(),
5979 "Invalid this class index %u in constant pool in class file %s",
5980 _this_class_index, CHECK);
5981
5982 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5983 assert(class_name_in_cp != NULL, "class_name can't be null");
5984
5985 // Update _class_name which could be null previously
5986 // to reflect the name in the constant pool
5987 _class_name = class_name_in_cp;
5988
5989 // Don't need to check whether this class name is legal or not.
5990 // It has been checked when constant pool is parsed.
5991 // However, make sure it is not an array type.
5992 if (_need_verify) {
5993 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5994 "Bad class name in class file %s",
5995 CHECK);
5996 }
5997
5998 // Checks if name in class file matches requested name
5999 if (_requested_name != NULL && _requested_name != _class_name) {
6000 ResourceMark rm(THREAD);
6001 Exceptions::fthrow(
6002 THREAD_AND_LOCATION,
6003 vmSymbols::java_lang_NoClassDefFoundError(),
6004 "%s (wrong name: %s)",
6005 _class_name->as_C_string(),
6006 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6007 );
6008 return;
6009 }
6010
6011 // if this is an anonymous class fix up its name if it's in the unnamed
6012 // package. Otherwise, throw IAE if it is in a different package than
6013 // its host class.
6014 if (_host_klass != NULL) {
6015 fix_anonymous_class_name(CHECK);
6016 }
6017
6018 // Verification prevents us from creating names with dots in them, this
6019 // asserts that that's the case.
6020 assert(is_internal_format(_class_name), "external class name format used internally");
6021
6022 if (!is_internal()) {
6023 LogTarget(Debug, class, preorder) lt;
6024 if (lt.is_enabled()){
6025 ResourceMark rm(THREAD);
6026 LogStream ls(lt);
6027 ls.print("%s", _class_name->as_klass_external_name());
6028 if (stream->source() != NULL) {
6029 ls.print(" source: %s", stream->source());
6030 }
6031 ls.cr();
6032 }
6033
6034 #if INCLUDE_CDS
6035 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6036 if (!ClassLoader::has_jrt_entry()) {
6037 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6038 DumpLoadedClassList = NULL;
6039 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6040 _host_klass == NULL) {
6041 // Only dump the classes that can be stored into CDS archive.
6042 // Anonymous classes such as generated LambdaForm classes are also not included.
6043 oop class_loader = _loader_data->class_loader();
6044 ResourceMark rm(THREAD);
6045 bool skip = false;
6046 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6047 // For the boot and platform class loaders, skip classes that are not found in the
6048 // java runtime image, such as those found in the --patch-module entries.
6049 // These classes can't be loaded from the archive during runtime.
6050 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6051 skip = true;
6052 }
6053
6054 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6055 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6056 // as they can be loaded from the archive during runtime.
6057 skip = false;
6058 }
6059 }
6060 if (skip) {
6061 tty->print_cr("skip writing class %s from source %s to classlist file",
6062 _class_name->as_C_string(), stream->source());
6063 } else {
6064 classlist_file->print_cr("%s", _class_name->as_C_string());
6065 classlist_file->flush();
6066 }
6067 }
6068 }
6069 #endif
6070 }
6071
6072 // SUPERKLASS
6073 _super_class_index = stream->get_u2_fast();
6074 _super_klass = parse_super_class(cp,
6075 _super_class_index,
6076 _need_verify,
6077 CHECK);
6078
6079 // Interfaces
6080 _itfs_len = stream->get_u2_fast();
6081 parse_interfaces(stream,
6082 _itfs_len,
6083 cp,
6084 &_has_nonstatic_concrete_methods,
6085 CHECK);
6086
6087 assert(_local_interfaces != NULL, "invariant");
6088
6089 // Fields (offsets are filled in later)
6090 _fac = new FieldAllocationCount();
6091 parse_fields(stream,
6092 _access_flags.is_interface(),
6093 _fac,
6094 cp,
6095 cp_size,
6096 &_java_fields_count,
6097 CHECK);
6098
6099 assert(_fields != NULL, "invariant");
6100
6101 // Methods
6102 AccessFlags promoted_flags;
6103 parse_methods(stream,
6104 _access_flags.is_interface(),
6105 &promoted_flags,
6106 &_has_final_method,
6107 &_declares_nonstatic_concrete_methods,
6108 CHECK);
6109
6110 assert(_methods != NULL, "invariant");
6111
6112 // promote flags from parse_methods() to the klass' flags
6113 _access_flags.add_promoted_flags(promoted_flags.as_int());
6114
6115 if (_declares_nonstatic_concrete_methods) {
6116 _has_nonstatic_concrete_methods = true;
6117 }
6118
6119 // Additional attributes/annotations
6120 _parsed_annotations = new ClassAnnotationCollector();
6121 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6122
6123 assert(_inner_classes != NULL, "invariant");
6124
6125 // Finalize the Annotations metadata object,
6126 // now that all annotation arrays have been created.
6127 create_combined_annotations(CHECK);
6128
6129 // Make sure this is the end of class file stream
6130 guarantee_property(stream->at_eos(),
6131 "Extra bytes at the end of class file %s",
6132 CHECK);
6133
6134 // all bytes in stream read and parsed
6135 }
6136
6137 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6138 ConstantPool* cp,
6139 TRAPS) {
6140 assert(stream != NULL, "invariant");
6141 assert(stream->at_eos(), "invariant");
6142 assert(cp != NULL, "invariant");
6143 assert(_loader_data != NULL, "invariant");
6144
6145 if (_class_name == vmSymbols::java_lang_Object()) {
6146 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6147 "java.lang.Object cannot implement an interface in class file %s",
6148 CHECK);
6149 }
6150 // We check super class after class file is parsed and format is checked
6151 if (_super_class_index > 0 && NULL ==_super_klass) {
6152 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6153 if (_access_flags.is_interface()) {
6154 // Before attempting to resolve the superclass, check for class format
6155 // errors not checked yet.
6156 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6157 "Interfaces must have java.lang.Object as superclass in class file %s",
6158 CHECK);
6159 }
6160 Handle loader(THREAD, _loader_data->class_loader());
6161 _super_klass = (const InstanceKlass*)
6162 SystemDictionary::resolve_super_or_fail(_class_name,
6163 super_class_name,
6164 loader,
6165 _protection_domain,
6166 true,
6167 CHECK);
6168 }
6169
6170 if (_super_klass != NULL) {
6171 if (_super_klass->has_nonstatic_concrete_methods()) {
6172 _has_nonstatic_concrete_methods = true;
6173 }
6174
6175 if (_super_klass->is_interface()) {
6176 ResourceMark rm(THREAD);
6177 Exceptions::fthrow(
6178 THREAD_AND_LOCATION,
6179 vmSymbols::java_lang_IncompatibleClassChangeError(),
6180 "class %s has interface %s as super class",
6181 _class_name->as_klass_external_name(),
6182 _super_klass->external_name()
6183 );
6184 return;
6185 }
6186 // Make sure super class is not final
6187 if (_super_klass->is_final()) {
6188 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6189 }
6190 }
6191
6192 // Compute the transitive list of all unique interfaces implemented by this class
6193 _transitive_interfaces =
6194 compute_transitive_interfaces(_super_klass,
6195 _local_interfaces,
6196 _loader_data,
6197 CHECK);
6198
6199 assert(_transitive_interfaces != NULL, "invariant");
6200
6201 // sort methods
6202 _method_ordering = sort_methods(_methods);
6203
6204 _all_mirandas = new GrowableArray<Method*>(20);
6205
6206 Handle loader(THREAD, _loader_data->class_loader());
6207 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6208 &_num_miranda_methods,
6209 _all_mirandas,
6210 _super_klass,
6211 _methods,
6212 _access_flags,
6213 _major_version,
6214 loader,
6215 _class_name,
6216 _local_interfaces,
6217 CHECK);
6218
6219 // Size of Java itable (in words)
6220 _itable_size = _access_flags.is_interface() ? 0 :
6221 klassItable::compute_itable_size(_transitive_interfaces);
6222
6223 assert(_fac != NULL, "invariant");
6224 assert(_parsed_annotations != NULL, "invariant");
6225
6226 _field_info = new FieldLayoutInfo();
6227 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6228
6229 // Compute reference typ
6230 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6231
6232 }
6233
6234 void ClassFileParser::set_klass(InstanceKlass* klass) {
6235
6236 #ifdef ASSERT
6237 if (klass != NULL) {
6238 assert(NULL == _klass, "leaking?");
6239 }
6240 #endif
6241
6242 _klass = klass;
6243 }
6244
6245 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6246
6247 #ifdef ASSERT
6248 if (klass != NULL) {
6249 assert(NULL == _klass_to_deallocate, "leaking?");
6250 }
6251 #endif
6252
6253 _klass_to_deallocate = klass;
6254 }
6255
6256 // Caller responsible for ResourceMark
6257 // clone stream with rewound position
6258 const ClassFileStream* ClassFileParser::clone_stream() const {
6259 assert(_stream != NULL, "invariant");
6260
6261 return _stream->clone();
6262 }
6263 // ----------------------------------------------------------------------------
6264 // debugging
6265
6266 #ifdef ASSERT
6267
6268 // return true if class_name contains no '.' (internal format is '/')
6269 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6270 if (class_name != NULL) {
6271 ResourceMark rm;
6272 char* name = class_name->as_C_string();
6273 return strchr(name, '.') == NULL;
6274 } else {
6275 return true;
6276 }
6277 }
6278
6279 #endif