1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #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.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "oops/valueKlass.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/perfData.hpp"
66 #include "runtime/reflection.hpp"
67 #include "runtime/safepointVerifiers.hpp"
68 #include "runtime/signature.hpp"
69 #include "runtime/timer.hpp"
70 #include "services/classLoadingService.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/align.hpp"
73 #include "utilities/bitMap.inline.hpp"
74 #include "utilities/copy.hpp"
75 #include "utilities/exceptions.hpp"
76 #include "utilities/globalDefinitions.hpp"
77 #include "utilities/growableArray.hpp"
78 #include "utilities/macros.hpp"
79 #include "utilities/ostream.hpp"
80 #include "utilities/resourceHash.hpp"
81 #if INCLUDE_CDS
82 #include "classfile/systemDictionaryShared.hpp"
83 #endif
84 #if INCLUDE_JFR
85 #include "jfr/support/jfrTraceIdExtension.hpp"
86 #endif
87
88 // We generally try to create the oops directly when parsing, rather than
89 // allocating temporary data structures and copying the bytes twice. A
90 // temporary area is only needed when parsing utf8 entries in the constant
91 // pool and when parsing line number tables.
92
93 // We add assert in debug mode when class format is not checked.
94
95 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
96 #define JAVA_MIN_SUPPORTED_VERSION 45
97 #define JAVA_PREVIEW_MINOR_VERSION 65535
98
99 // Used for two backward compatibility reasons:
100 // - to check for new additions to the class file format in JDK1.5
101 // - to check for bug fixes in the format checker in JDK1.5
102 #define JAVA_1_5_VERSION 49
103
104 // Used for backward compatibility reasons:
105 // - to check for javac bug fixes that happened after 1.5
106 // - also used as the max version when running in jdk6
107 #define JAVA_6_VERSION 50
108
109 // Used for backward compatibility reasons:
110 // - to disallow argument and require ACC_STATIC for <clinit> methods
111 #define JAVA_7_VERSION 51
112
113 // Extension method support.
114 #define JAVA_8_VERSION 52
115
116 #define JAVA_9_VERSION 53
117
118 #define JAVA_10_VERSION 54
119
120 #define JAVA_11_VERSION 55
121
122 #define JAVA_12_VERSION 56
123
124 #define JAVA_13_VERSION 57
125
126 #define CONSTANT_CLASS_DESCRIPTORS 57
127
128 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
129 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
130 "Unexpected bad constant pool entry");
131 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
132 }
133
134 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
135 ConstantPool* cp,
136 const int length,
137 TRAPS) {
138 assert(stream != NULL, "invariant");
139 assert(cp != NULL, "invariant");
140
141 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
142 // this function (_current can be allocated in a register, with scalar
143 // replacement of aggregates). The _current pointer is copied back to
144 // stream() when this function returns. DON'T call another method within
145 // this method that uses stream().
146 const ClassFileStream cfs1 = *stream;
147 const ClassFileStream* const cfs = &cfs1;
148
149 assert(cfs->allocated_on_stack(), "should be local");
150 debug_only(const u1* const old_current = stream->current();)
151
152 // Used for batching symbol allocations.
153 const char* names[SymbolTable::symbol_alloc_batch_size];
154 int lengths[SymbolTable::symbol_alloc_batch_size];
155 int indices[SymbolTable::symbol_alloc_batch_size];
156 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
157 int names_count = 0;
158
159 // parsing Index 0 is unused
160 for (int index = 1; index < length; index++) {
161 // Each of the following case guarantees one more byte in the stream
162 // for the following tag or the access_flags following constant pool,
163 // so we don't need bounds-check for reading tag.
164 const u1 tag = cfs->get_u1_fast();
165 switch (tag) {
166 case JVM_CONSTANT_Class: {
167 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
168 const u2 name_index = cfs->get_u2_fast();
169 cp->klass_index_at_put(index, name_index);
170 break;
171 }
172 case JVM_CONSTANT_Fieldref: {
173 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
174 const u2 class_index = cfs->get_u2_fast();
175 const u2 name_and_type_index = cfs->get_u2_fast();
176 cp->field_at_put(index, class_index, name_and_type_index);
177 break;
178 }
179 case JVM_CONSTANT_Methodref: {
180 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
181 const u2 class_index = cfs->get_u2_fast();
182 const u2 name_and_type_index = cfs->get_u2_fast();
183 cp->method_at_put(index, class_index, name_and_type_index);
184 break;
185 }
186 case JVM_CONSTANT_InterfaceMethodref: {
187 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
188 const u2 class_index = cfs->get_u2_fast();
189 const u2 name_and_type_index = cfs->get_u2_fast();
190 cp->interface_method_at_put(index, class_index, name_and_type_index);
191 break;
192 }
193 case JVM_CONSTANT_String : {
194 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
195 const u2 string_index = cfs->get_u2_fast();
196 cp->string_index_at_put(index, string_index);
197 break;
198 }
199 case JVM_CONSTANT_MethodHandle :
200 case JVM_CONSTANT_MethodType: {
201 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
202 classfile_parse_error(
203 "Class file version does not support constant tag %u in class file %s",
204 tag, CHECK);
205 }
206 if (tag == JVM_CONSTANT_MethodHandle) {
207 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
208 const u1 ref_kind = cfs->get_u1_fast();
209 const u2 method_index = cfs->get_u2_fast();
210 cp->method_handle_index_at_put(index, ref_kind, method_index);
211 }
212 else if (tag == JVM_CONSTANT_MethodType) {
213 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
214 const u2 signature_index = cfs->get_u2_fast();
215 cp->method_type_index_at_put(index, signature_index);
216 }
217 else {
218 ShouldNotReachHere();
219 }
220 break;
221 }
222 case JVM_CONSTANT_Dynamic : {
223 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
224 classfile_parse_error(
225 "Class file version does not support constant tag %u in class file %s",
226 tag, CHECK);
227 }
228 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
229 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
230 const u2 name_and_type_index = cfs->get_u2_fast();
231 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
232 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
233 }
234 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
235 break;
236 }
237 case JVM_CONSTANT_InvokeDynamic : {
238 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
239 classfile_parse_error(
240 "Class file version does not support constant tag %u in class file %s",
241 tag, CHECK);
242 }
243 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
244 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
245 const u2 name_and_type_index = cfs->get_u2_fast();
246 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
247 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
248 }
249 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
250 break;
251 }
252 case JVM_CONSTANT_Integer: {
253 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
254 const u4 bytes = cfs->get_u4_fast();
255 cp->int_at_put(index, (jint)bytes);
256 break;
257 }
258 case JVM_CONSTANT_Float: {
259 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
260 const u4 bytes = cfs->get_u4_fast();
261 cp->float_at_put(index, *(jfloat*)&bytes);
262 break;
263 }
264 case JVM_CONSTANT_Long: {
265 // A mangled type might cause you to overrun allocated memory
266 guarantee_property(index + 1 < length,
267 "Invalid constant pool entry %u in class file %s",
268 index,
269 CHECK);
270 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
271 const u8 bytes = cfs->get_u8_fast();
272 cp->long_at_put(index, bytes);
273 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
274 break;
275 }
276 case JVM_CONSTANT_Double: {
277 // A mangled type might cause you to overrun allocated memory
278 guarantee_property(index+1 < length,
279 "Invalid constant pool entry %u in class file %s",
280 index,
281 CHECK);
282 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
283 const u8 bytes = cfs->get_u8_fast();
284 cp->double_at_put(index, *(jdouble*)&bytes);
285 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
286 break;
287 }
288 case JVM_CONSTANT_NameAndType: {
289 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
290 const u2 name_index = cfs->get_u2_fast();
291 const u2 signature_index = cfs->get_u2_fast();
292 cp->name_and_type_at_put(index, name_index, signature_index);
293 break;
294 }
295 case JVM_CONSTANT_Utf8 : {
296 cfs->guarantee_more(2, CHECK); // utf8_length
297 u2 utf8_length = cfs->get_u2_fast();
298 const u1* utf8_buffer = cfs->current();
299 assert(utf8_buffer != NULL, "null utf8 buffer");
300 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
301 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
302 cfs->skip_u1_fast(utf8_length);
303
304 // Before storing the symbol, make sure it's legal
305 if (_need_verify) {
306 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
307 }
308
309 if (has_cp_patch_at(index)) {
310 Handle patch = clear_cp_patch_at(index);
311 guarantee_property(java_lang_String::is_instance(patch()),
312 "Illegal utf8 patch at %d in class file %s",
313 index,
314 CHECK);
315 const char* const str = java_lang_String::as_utf8_string(patch());
316 // (could use java_lang_String::as_symbol instead, but might as well batch them)
317 utf8_buffer = (const u1*) str;
318 utf8_length = (int) strlen(str);
319 }
320
321 unsigned int hash;
322 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
323 utf8_length,
324 hash);
325 if (result == NULL) {
326 names[names_count] = (const char*)utf8_buffer;
327 lengths[names_count] = utf8_length;
328 indices[names_count] = index;
329 hashValues[names_count++] = hash;
330 if (names_count == SymbolTable::symbol_alloc_batch_size) {
331 SymbolTable::new_symbols(_loader_data,
332 cp,
333 names_count,
334 names,
335 lengths,
336 indices,
337 hashValues,
338 CHECK);
339 names_count = 0;
340 }
341 } else {
342 cp->symbol_at_put(index, result);
343 }
344 break;
345 }
346 case 19:
347 case 20: {
348 // Record that an error occurred in these two cases but keep parsing so
349 // that ACC_Module can be checked for in the access_flags. Need to
350 // throw NoClassDefFoundError in that case.
351 if (_major_version >= JAVA_9_VERSION) {
352 cfs->guarantee_more(3, CHECK);
353 cfs->get_u2_fast();
354 set_class_bad_constant_seen(tag);
355 break;
356 }
357 }
358 default: {
359 classfile_parse_error("Unknown constant tag %u in class file %s",
360 tag,
361 CHECK);
362 break;
363 }
364 } // end of switch(tag)
365 } // end of for
366
367 // Allocate the remaining symbols
368 if (names_count > 0) {
369 SymbolTable::new_symbols(_loader_data,
370 cp,
371 names_count,
372 names,
373 lengths,
374 indices,
375 hashValues,
376 CHECK);
377 }
378
379 // Copy _current pointer of local copy back to stream.
380 assert(stream->current() == old_current, "non-exclusive use of stream");
381 stream->set_current(cfs1.current());
382
383 }
384
385 static inline bool valid_cp_range(int index, int length) {
386 return (index > 0 && index < length);
387 }
388
389 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
390 assert(cp != NULL, "invariant");
391 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
392 return cp->symbol_at(index);
393 }
394 return NULL;
395 }
396
397 #ifdef ASSERT
398 PRAGMA_DIAG_PUSH
399 PRAGMA_FORMAT_NONLITERAL_IGNORED
400 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
401 ResourceMark rm(THREAD);
402 fatal(msg, _class_name->as_C_string());
403 }
404
405 void ClassFileParser::report_assert_property_failure(const char* msg,
406 int index,
407 TRAPS) const {
408 ResourceMark rm(THREAD);
409 fatal(msg, index, _class_name->as_C_string());
410 }
411 PRAGMA_DIAG_POP
412 #endif
413
414 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
415 ConstantPool* const cp,
416 const int length,
417 TRAPS) {
418 assert(cp != NULL, "invariant");
419 assert(stream != NULL, "invariant");
420
421 // parsing constant pool entries
422 parse_constant_pool_entries(stream, cp, length, CHECK);
423 if (class_bad_constant_seen() != 0) {
424 // a bad CP entry has been detected previously so stop parsing and just return.
425 return;
426 }
427
428 int index = 1; // declared outside of loops for portability
429 int num_klasses = 0;
430
431 // first verification pass - validate cross references
432 // and fixup class and string constants
433 for (index = 1; index < length; index++) { // Index 0 is unused
434 const jbyte tag = cp->tag_at(index).value();
435 switch (tag) {
436 case JVM_CONSTANT_Class: {
437 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
438 break;
439 }
440 case JVM_CONSTANT_Fieldref:
441 // fall through
442 case JVM_CONSTANT_Methodref:
443 // fall through
444 case JVM_CONSTANT_InterfaceMethodref: {
445 if (!_need_verify) break;
446 const int klass_ref_index = cp->klass_ref_index_at(index);
447 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
448 check_property(valid_klass_reference_at(klass_ref_index),
449 "Invalid constant pool index %u in class file %s",
450 klass_ref_index, CHECK);
451 check_property(valid_cp_range(name_and_type_ref_index, length) &&
452 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
453 "Invalid constant pool index %u in class file %s",
454 name_and_type_ref_index, CHECK);
455 break;
456 }
457 case JVM_CONSTANT_String: {
458 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
459 break;
460 }
461 case JVM_CONSTANT_Integer:
462 break;
463 case JVM_CONSTANT_Float:
464 break;
465 case JVM_CONSTANT_Long:
466 case JVM_CONSTANT_Double: {
467 index++;
468 check_property(
469 (index < length && cp->tag_at(index).is_invalid()),
470 "Improper constant pool long/double index %u in class file %s",
471 index, CHECK);
472 break;
473 }
474 case JVM_CONSTANT_NameAndType: {
475 if (!_need_verify) break;
476 const int name_ref_index = cp->name_ref_index_at(index);
477 const int signature_ref_index = cp->signature_ref_index_at(index);
478 check_property(valid_symbol_at(name_ref_index),
479 "Invalid constant pool index %u in class file %s",
480 name_ref_index, CHECK);
481 check_property(valid_symbol_at(signature_ref_index),
482 "Invalid constant pool index %u in class file %s",
483 signature_ref_index, CHECK);
484 break;
485 }
486 case JVM_CONSTANT_Utf8:
487 break;
488 case JVM_CONSTANT_UnresolvedClass: // fall-through
489 case JVM_CONSTANT_UnresolvedClassInError: {
490 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
491 break;
492 }
493 case JVM_CONSTANT_ClassIndex: {
494 const int class_index = cp->klass_index_at(index);
495 check_property(valid_symbol_at(class_index),
496 "Invalid constant pool index %u in class file %s",
497 class_index, CHECK);
498
499 Symbol* const name = cp->symbol_at(class_index);
500 const unsigned int name_len = name->utf8_length();
501 if (name->is_Q_signature()) {
502 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
503 } else {
504 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
505 }
506 break;
507 }
508 case JVM_CONSTANT_StringIndex: {
509 const int string_index = cp->string_index_at(index);
510 check_property(valid_symbol_at(string_index),
511 "Invalid constant pool index %u in class file %s",
512 string_index, CHECK);
513 Symbol* const sym = cp->symbol_at(string_index);
514 cp->unresolved_string_at_put(index, sym);
515 break;
516 }
517 case JVM_CONSTANT_MethodHandle: {
518 const int ref_index = cp->method_handle_index_at(index);
519 check_property(valid_cp_range(ref_index, length),
520 "Invalid constant pool index %u in class file %s",
521 ref_index, CHECK);
522 const constantTag tag = cp->tag_at(ref_index);
523 const int ref_kind = cp->method_handle_ref_kind_at(index);
524
525 switch (ref_kind) {
526 case JVM_REF_getField:
527 case JVM_REF_getStatic:
528 case JVM_REF_putField:
529 case JVM_REF_putStatic: {
530 check_property(
531 tag.is_field(),
532 "Invalid constant pool index %u in class file %s (not a field)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeVirtual:
537 case JVM_REF_newInvokeSpecial: {
538 check_property(
539 tag.is_method(),
540 "Invalid constant pool index %u in class file %s (not a method)",
541 ref_index, CHECK);
542 break;
543 }
544 case JVM_REF_invokeStatic:
545 case JVM_REF_invokeSpecial: {
546 check_property(
547 tag.is_method() ||
548 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
549 "Invalid constant pool index %u in class file %s (not a method)",
550 ref_index, CHECK);
551 break;
552 }
553 case JVM_REF_invokeInterface: {
554 check_property(
555 tag.is_interface_method(),
556 "Invalid constant pool index %u in class file %s (not an interface method)",
557 ref_index, CHECK);
558 break;
559 }
560 default: {
561 classfile_parse_error(
562 "Bad method handle kind at constant pool index %u in class file %s",
563 index, CHECK);
564 }
565 } // switch(refkind)
566 // Keep the ref_index unchanged. It will be indirected at link-time.
567 break;
568 } // case MethodHandle
569 case JVM_CONSTANT_MethodType: {
570 const int ref_index = cp->method_type_index_at(index);
571 check_property(valid_symbol_at(ref_index),
572 "Invalid constant pool index %u in class file %s",
573 ref_index, CHECK);
574 break;
575 }
576 case JVM_CONSTANT_Dynamic: {
577 const int name_and_type_ref_index =
578 cp->bootstrap_name_and_type_ref_index_at(index);
579
580 check_property(valid_cp_range(name_and_type_ref_index, length) &&
581 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
582 "Invalid constant pool index %u in class file %s",
583 name_and_type_ref_index, CHECK);
584 // bootstrap specifier index must be checked later,
585 // when BootstrapMethods attr is available
586
587 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
588 cp->set_has_dynamic_constant();
589 break;
590 }
591 case JVM_CONSTANT_InvokeDynamic: {
592 const int name_and_type_ref_index =
593 cp->bootstrap_name_and_type_ref_index_at(index);
594
595 check_property(valid_cp_range(name_and_type_ref_index, length) &&
596 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
597 "Invalid constant pool index %u in class file %s",
598 name_and_type_ref_index, CHECK);
599 // bootstrap specifier index must be checked later,
600 // when BootstrapMethods attr is available
601 break;
602 }
603 default: {
604 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
605 ShouldNotReachHere();
606 break;
607 }
608 } // switch(tag)
609 } // end of for
610
611 _first_patched_klass_resolved_index = num_klasses;
612 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
613
614 if (_cp_patches != NULL) {
615 // need to treat this_class specially...
616
617 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
618 // for now. These will be replaced with actual names of the patched classes in patch_class().
619 Symbol* s = vmSymbols::star_name();
620 for (int n=_orig_cp_size; n<cp->length(); n++) {
621 cp->symbol_at_put(n, s);
622 }
623
624 int this_class_index;
625 {
626 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
627 const u1* const mark = stream->current();
628 stream->skip_u2_fast(1); // skip flags
629 this_class_index = stream->get_u2_fast();
630 stream->set_current(mark); // revert to mark
631 }
632
633 for (index = 1; index < length; index++) { // Index 0 is unused
634 if (has_cp_patch_at(index)) {
635 guarantee_property(index != this_class_index,
636 "Illegal constant pool patch to self at %d in class file %s",
637 index, CHECK);
638 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
639 }
640 }
641 }
642
643 if (!_need_verify) {
644 return;
645 }
646
647 // second verification pass - checks the strings are of the right format.
648 // but not yet to the other entries
649 for (index = 1; index < length; index++) {
650 const jbyte tag = cp->tag_at(index).value();
651 switch (tag) {
652 case JVM_CONSTANT_UnresolvedClass: {
653 const Symbol* const class_name = cp->klass_name_at(index);
654 // check the name, even if _cp_patches will overwrite it
655 verify_legal_class_name(class_name, CHECK);
656 break;
657 }
658 case JVM_CONSTANT_NameAndType: {
659 if (_need_verify) {
660 const int sig_index = cp->signature_ref_index_at(index);
661 const int name_index = cp->name_ref_index_at(index);
662 const Symbol* const name = cp->symbol_at(name_index);
663 const Symbol* const sig = cp->symbol_at(sig_index);
664 guarantee_property(sig->utf8_length() != 0,
665 "Illegal zero length constant pool entry at %d in class %s",
666 sig_index, CHECK);
667 guarantee_property(name->utf8_length() != 0,
668 "Illegal zero length constant pool entry at %d in class %s",
669 name_index, CHECK);
670
671 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
672 // Format check method name and signature
673 verify_legal_method_name(name, CHECK);
674 verify_legal_method_signature(name, sig, CHECK);
675 } else {
676 // Format check field name and signature
677 verify_legal_field_name(name, CHECK);
678 verify_legal_field_signature(name, sig, CHECK);
679 }
680 }
681 break;
682 }
683 case JVM_CONSTANT_Dynamic: {
684 const int name_and_type_ref_index =
685 cp->name_and_type_ref_index_at(index);
686 // already verified to be utf8
687 const int name_ref_index =
688 cp->name_ref_index_at(name_and_type_ref_index);
689 // already verified to be utf8
690 const int signature_ref_index =
691 cp->signature_ref_index_at(name_and_type_ref_index);
692 const Symbol* const name = cp->symbol_at(name_ref_index);
693 const Symbol* const signature = cp->symbol_at(signature_ref_index);
694 if (_need_verify) {
695 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
696 // Need only to be sure signature is non-zero length and the right type.
697 if (signature->utf8_length() == 0 ||
698 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
699 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
700 }
701 }
702 break;
703 }
704 case JVM_CONSTANT_InvokeDynamic:
705 case JVM_CONSTANT_Fieldref:
706 case JVM_CONSTANT_Methodref:
707 case JVM_CONSTANT_InterfaceMethodref: {
708 const int name_and_type_ref_index =
709 cp->name_and_type_ref_index_at(index);
710 // already verified to be utf8
711 const int name_ref_index =
712 cp->name_ref_index_at(name_and_type_ref_index);
713 // already verified to be utf8
714 const int signature_ref_index =
715 cp->signature_ref_index_at(name_and_type_ref_index);
716 const Symbol* const name = cp->symbol_at(name_ref_index);
717 const Symbol* const signature = cp->symbol_at(signature_ref_index);
718 if (tag == JVM_CONSTANT_Fieldref) {
719 if (_need_verify) {
720 // Field name and signature are verified above, when iterating NameAndType_info.
721 // Need only to be sure signature is non-zero length and the right type.
722 if (signature->utf8_length() == 0 ||
723 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
724 throwIllegalSignature("Field", name, signature, CHECK);
725 }
726 }
727 } else {
728 if (_need_verify) {
729 // Method name and signature are verified above, when iterating NameAndType_info.
730 // Need only to be sure signature is non-zero length and the right type.
731 if (signature->utf8_length() == 0 ||
732 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
733 throwIllegalSignature("Method", name, signature, CHECK);
734 }
735 }
736 // 4509014: If a class method name begins with '<', it must be "<init>"
737 const unsigned int name_len = name->utf8_length();
738 if (tag == JVM_CONSTANT_Methodref &&
739 name_len != 0 &&
740 name->char_at(0) == '<' &&
741 name != vmSymbols::object_initializer_name()) {
742 classfile_parse_error(
743 "Bad method name at constant pool index %u in class file %s",
744 name_ref_index, CHECK);
745 }
746 }
747 break;
748 }
749 case JVM_CONSTANT_MethodHandle: {
750 const int ref_index = cp->method_handle_index_at(index);
751 const int ref_kind = cp->method_handle_ref_kind_at(index);
752 switch (ref_kind) {
753 case JVM_REF_invokeVirtual:
754 case JVM_REF_invokeStatic:
755 case JVM_REF_invokeSpecial:
756 case JVM_REF_newInvokeSpecial: {
757 const int name_and_type_ref_index =
758 cp->name_and_type_ref_index_at(ref_index);
759 const int name_ref_index =
760 cp->name_ref_index_at(name_and_type_ref_index);
761 const Symbol* const name = cp->symbol_at(name_ref_index);
762 if (ref_kind == JVM_REF_newInvokeSpecial) {
763 if (name != vmSymbols::object_initializer_name()) {
764 classfile_parse_error(
765 "Bad constructor name at constant pool index %u in class file %s",
766 name_ref_index, CHECK);
767 }
768 } else {
769 if (name == vmSymbols::object_initializer_name()) {
770 classfile_parse_error(
771 "Bad method name at constant pool index %u in class file %s",
772 name_ref_index, CHECK);
773 }
774 }
775 break;
776 }
777 // Other ref_kinds are already fully checked in previous pass.
778 } // switch(ref_kind)
779 break;
780 }
781 case JVM_CONSTANT_MethodType: {
782 const Symbol* const no_name = vmSymbols::type_name(); // place holder
783 const Symbol* const signature = cp->method_type_signature_at(index);
784 verify_legal_method_signature(no_name, signature, CHECK);
785 break;
786 }
787 case JVM_CONSTANT_Utf8: {
788 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
789 }
790 } // switch(tag)
791 } // end of for
792 }
793
794 Handle ClassFileParser::clear_cp_patch_at(int index) {
795 Handle patch = cp_patch_at(index);
796 _cp_patches->at_put(index, Handle());
797 assert(!has_cp_patch_at(index), "");
798 return patch;
799 }
800
801 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
802 int name_index = _orig_cp_size + _num_patched_klasses;
803 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
804
805 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
806 _num_patched_klasses ++;
807 }
808
809 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
810 int index,
811 Handle patch,
812 TRAPS) {
813 assert(cp != NULL, "invariant");
814
815 BasicType patch_type = T_VOID;
816
817 switch (cp->tag_at(index).value()) {
818
819 case JVM_CONSTANT_UnresolvedClass: {
820 // Patching a class means pre-resolving it.
821 // The name in the constant pool is ignored.
822 if (java_lang_Class::is_instance(patch())) {
823 guarantee_property(!java_lang_Class::is_primitive(patch()),
824 "Illegal class patch at %d in class file %s",
825 index, CHECK);
826 Klass* k = java_lang_Class::as_Klass(patch());
827 patch_class(cp, index, k, k->name());
828 } else {
829 guarantee_property(java_lang_String::is_instance(patch()),
830 "Illegal class patch at %d in class file %s",
831 index, CHECK);
832 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
833 patch_class(cp, index, NULL, name);
834 }
835 break;
836 }
837
838 case JVM_CONSTANT_String: {
839 // skip this patch and don't clear it. Needs the oop array for resolved
840 // references to be created first.
841 return;
842 }
843 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
844 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
845 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
846 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
847 patch_prim:
848 {
849 jvalue value;
850 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
851 guarantee_property(value_type == patch_type,
852 "Illegal primitive patch at %d in class file %s",
853 index, CHECK);
854 switch (value_type) {
855 case T_INT: cp->int_at_put(index, value.i); break;
856 case T_FLOAT: cp->float_at_put(index, value.f); break;
857 case T_LONG: cp->long_at_put(index, value.j); break;
858 case T_DOUBLE: cp->double_at_put(index, value.d); break;
859 default: assert(false, "");
860 }
861 } // end patch_prim label
862 break;
863
864 default: {
865 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
866 guarantee_property(!has_cp_patch_at(index),
867 "Illegal unexpected patch at %d in class file %s",
868 index, CHECK);
869 return;
870 }
871 } // end of switch(tag)
872
873 // On fall-through, mark the patch as used.
874 clear_cp_patch_at(index);
875 }
876 class NameSigHash: public ResourceObj {
877 public:
878 const Symbol* _name; // name
879 const Symbol* _sig; // signature
880 NameSigHash* _next; // Next entry in hash table
881 };
882
883 static const int HASH_ROW_SIZE = 256;
884
885 static unsigned int hash(const Symbol* name, const Symbol* sig) {
886 unsigned int raw_hash = 0;
887 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
888 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
889
890 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
891 }
892
893
894 static void initialize_hashtable(NameSigHash** table) {
895 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
896 }
897 // Return false if the name/sig combination is found in table.
898 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
899 // The old format checker uses heap sort to find duplicates.
900 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
901 // of table since we don't expect Symbol*'s to move.
902 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
903 assert(name != NULL, "name in constant pool is NULL");
904
905 // First lookup for duplicates
906 int index = hash(name, sig);
907 NameSigHash* entry = table[index];
908 while (entry != NULL) {
909 if (entry->_name == name && entry->_sig == sig) {
910 return false;
911 }
912 entry = entry->_next;
913 }
914
915 // No duplicate is found, allocate a new entry and fill it.
916 entry = new NameSigHash();
917 entry->_name = name;
918 entry->_sig = sig;
919
920 // Insert into hash table
921 entry->_next = table[index];
922 table[index] = entry;
923
924 return true;
925 }
926
927 // Side-effects: populates the _local_interfaces field
928 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
929 const int itfs_len,
930 ConstantPool* const cp,
931 bool* const has_nonstatic_concrete_methods,
932 TRAPS) {
933 assert(stream != NULL, "invariant");
934 assert(cp != NULL, "invariant");
935 assert(has_nonstatic_concrete_methods != NULL, "invariant");
936
937 if (itfs_len == 0) {
938 _local_interfaces = Universe::the_empty_instance_klass_array();
939 } else {
940 assert(itfs_len > 0, "only called for len>0");
941 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
942
943 int index;
944 for (index = 0; index < itfs_len; index++) {
945 const u2 interface_index = stream->get_u2(CHECK);
946 Klass* interf;
947 check_property(
948 valid_klass_reference_at(interface_index),
949 "Interface name has bad constant pool index %u in class file %s",
950 interface_index, CHECK);
951 if (cp->tag_at(interface_index).is_klass()) {
952 interf = cp->resolved_klass_at(interface_index);
953 } else {
954 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
955
956 // Don't need to check legal name because it's checked when parsing constant pool.
957 // But need to make sure it's not an array type.
958 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
959 "Bad interface name in class file %s", CHECK);
960
961 // Call resolve_super so classcircularity is checked
962 interf = SystemDictionary::resolve_super_or_fail(
963 _class_name,
964 unresolved_klass,
965 Handle(THREAD, _loader_data->class_loader()),
966 _protection_domain,
967 false,
968 CHECK);
969 }
970
971 if (!interf->is_interface()) {
972 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
973 err_msg("class %s can not implement %s, because it is not an interface (%s)",
974 _class_name->as_klass_external_name(),
975 interf->external_name(),
976 interf->class_in_module_of_loader()));
977 }
978
979 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
980 *has_nonstatic_concrete_methods = true;
981 }
982 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
983 }
984
985 if (!_need_verify || itfs_len <= 1) {
986 return;
987 }
988
989 // Check if there's any duplicates in interfaces
990 ResourceMark rm(THREAD);
991 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
992 NameSigHash*,
993 HASH_ROW_SIZE);
994 initialize_hashtable(interface_names);
995 bool dup = false;
996 const Symbol* name = NULL;
997 {
998 debug_only(NoSafepointVerifier nsv;)
999 for (index = 0; index < itfs_len; index++) {
1000 const InstanceKlass* const k = _local_interfaces->at(index);
1001 name = k->name();
1002 // If no duplicates, add (name, NULL) in hashtable interface_names.
1003 if (!put_after_lookup(name, NULL, interface_names)) {
1004 dup = true;
1005 break;
1006 }
1007 }
1008 }
1009 if (dup) {
1010 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1011 name->as_C_string(), CHECK);
1012 }
1013 }
1014 }
1015
1016 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1017 int constantvalue_index,
1018 int signature_index,
1019 TRAPS) const {
1020 // Make sure the constant pool entry is of a type appropriate to this field
1021 guarantee_property(
1022 (constantvalue_index > 0 &&
1023 constantvalue_index < cp->length()),
1024 "Bad initial value index %u in ConstantValue attribute in class file %s",
1025 constantvalue_index, CHECK);
1026
1027 const constantTag value_type = cp->tag_at(constantvalue_index);
1028 switch(cp->basic_type_for_signature_at(signature_index)) {
1029 case T_LONG: {
1030 guarantee_property(value_type.is_long(),
1031 "Inconsistent constant value type in class file %s",
1032 CHECK);
1033 break;
1034 }
1035 case T_FLOAT: {
1036 guarantee_property(value_type.is_float(),
1037 "Inconsistent constant value type in class file %s",
1038 CHECK);
1039 break;
1040 }
1041 case T_DOUBLE: {
1042 guarantee_property(value_type.is_double(),
1043 "Inconsistent constant value type in class file %s",
1044 CHECK);
1045 break;
1046 }
1047 case T_BYTE:
1048 case T_CHAR:
1049 case T_SHORT:
1050 case T_BOOLEAN:
1051 case T_INT: {
1052 guarantee_property(value_type.is_int(),
1053 "Inconsistent constant value type in class file %s",
1054 CHECK);
1055 break;
1056 }
1057 case T_OBJECT: {
1058 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1059 && value_type.is_string()),
1060 "Bad string initial value in class file %s",
1061 CHECK);
1062 break;
1063 }
1064 default: {
1065 classfile_parse_error("Unable to set initial value %u in class file %s",
1066 constantvalue_index,
1067 CHECK);
1068 }
1069 }
1070 }
1071
1072 class AnnotationCollector : public ResourceObj{
1073 public:
1074 enum Location { _in_field, _in_method, _in_class };
1075 enum ID {
1076 _unknown = 0,
1077 _method_CallerSensitive,
1078 _method_ForceInline,
1079 _method_DontInline,
1080 _method_InjectedProfile,
1081 _method_LambdaForm_Compiled,
1082 _method_Hidden,
1083 _method_HotSpotIntrinsicCandidate,
1084 _jdk_internal_vm_annotation_Contended,
1085 _field_Stable,
1086 _jdk_internal_vm_annotation_ReservedStackAccess,
1087 _annotation_LIMIT
1088 };
1089 const Location _location;
1090 int _annotations_present;
1091 u2 _contended_group;
1092
1093 AnnotationCollector(Location location)
1094 : _location(location), _annotations_present(0)
1095 {
1096 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1097 }
1098 // If this annotation name has an ID, report it (or _none).
1099 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1100 // Set the annotation name:
1101 void set_annotation(ID id) {
1102 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1103 _annotations_present |= nth_bit((int)id);
1104 }
1105
1106 void remove_annotation(ID id) {
1107 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1108 _annotations_present &= ~nth_bit((int)id);
1109 }
1110
1111 // Report if the annotation is present.
1112 bool has_any_annotations() const { return _annotations_present != 0; }
1113 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1114
1115 void set_contended_group(u2 group) { _contended_group = group; }
1116 u2 contended_group() const { return _contended_group; }
1117
1118 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1119
1120 void set_stable(bool stable) { set_annotation(_field_Stable); }
1121 bool is_stable() const { return has_annotation(_field_Stable); }
1122 };
1123
1124 // This class also doubles as a holder for metadata cleanup.
1125 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1126 private:
1127 ClassLoaderData* _loader_data;
1128 AnnotationArray* _field_annotations;
1129 AnnotationArray* _field_type_annotations;
1130 public:
1131 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1132 AnnotationCollector(_in_field),
1133 _loader_data(loader_data),
1134 _field_annotations(NULL),
1135 _field_type_annotations(NULL) {}
1136 ~FieldAnnotationCollector();
1137 void apply_to(FieldInfo* f);
1138 AnnotationArray* field_annotations() { return _field_annotations; }
1139 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1140
1141 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1142 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1143 };
1144
1145 class MethodAnnotationCollector : public AnnotationCollector{
1146 public:
1147 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1148 void apply_to(const methodHandle& m);
1149 };
1150
1151 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1152 public:
1153 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1154 void apply_to(InstanceKlass* ik);
1155 };
1156
1157
1158 static int skip_annotation_value(const u1*, int, int); // fwd decl
1159
1160 // Safely increment index by val if does not pass limit
1161 #define SAFE_ADD(index, limit, val) \
1162 if (index >= limit - val) return limit; \
1163 index += val;
1164
1165 // Skip an annotation. Return >=limit if there is any problem.
1166 static int skip_annotation(const u1* buffer, int limit, int index) {
1167 assert(buffer != NULL, "invariant");
1168 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1169 // value := switch (tag:u1) { ... }
1170 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1171 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1172 while (--nmem >= 0 && index < limit) {
1173 SAFE_ADD(index, limit, 2); // skip member
1174 index = skip_annotation_value(buffer, limit, index);
1175 }
1176 return index;
1177 }
1178
1179 // Skip an annotation value. Return >=limit if there is any problem.
1180 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1181 assert(buffer != NULL, "invariant");
1182
1183 // value := switch (tag:u1) {
1184 // case B, C, I, S, Z, D, F, J, c: con:u2;
1185 // case e: e_class:u2 e_name:u2;
1186 // case s: s_con:u2;
1187 // case [: do(nval:u2) {value};
1188 // case @: annotation;
1189 // case s: s_con:u2;
1190 // }
1191 SAFE_ADD(index, limit, 1); // read tag
1192 const u1 tag = buffer[index - 1];
1193 switch (tag) {
1194 case 'B':
1195 case 'C':
1196 case 'I':
1197 case 'S':
1198 case 'Z':
1199 case 'D':
1200 case 'F':
1201 case 'J':
1202 case 'c':
1203 case 's':
1204 SAFE_ADD(index, limit, 2); // skip con or s_con
1205 break;
1206 case 'e':
1207 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1208 break;
1209 case '[':
1210 {
1211 SAFE_ADD(index, limit, 2); // read nval
1212 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1213 while (--nval >= 0 && index < limit) {
1214 index = skip_annotation_value(buffer, limit, index);
1215 }
1216 }
1217 break;
1218 case '@':
1219 index = skip_annotation(buffer, limit, index);
1220 break;
1221 default:
1222 return limit; // bad tag byte
1223 }
1224 return index;
1225 }
1226
1227 // Sift through annotations, looking for those significant to the VM:
1228 static void parse_annotations(const ConstantPool* const cp,
1229 const u1* buffer, int limit,
1230 AnnotationCollector* coll,
1231 ClassLoaderData* loader_data,
1232 TRAPS) {
1233
1234 assert(cp != NULL, "invariant");
1235 assert(buffer != NULL, "invariant");
1236 assert(coll != NULL, "invariant");
1237 assert(loader_data != NULL, "invariant");
1238
1239 // annotations := do(nann:u2) {annotation}
1240 int index = 2; // read nann
1241 if (index >= limit) return;
1242 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1243 enum { // initial annotation layout
1244 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1245 count_off = 2, // u2 such as 1 (one value)
1246 member_off = 4, // utf8 such as 'value'
1247 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1248 e_tag_val = 'e',
1249 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1250 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1251 e_size = 11, // end of 'e' annotation
1252 c_tag_val = 'c', // payload is type
1253 c_con_off = 7, // utf8 payload, such as 'I'
1254 c_size = 9, // end of 'c' annotation
1255 s_tag_val = 's', // payload is String
1256 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1257 s_size = 9,
1258 min_size = 6 // smallest possible size (zero members)
1259 };
1260 // Cannot add min_size to index in case of overflow MAX_INT
1261 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1262 int index0 = index;
1263 index = skip_annotation(buffer, limit, index);
1264 const u1* const abase = buffer + index0;
1265 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1266 const int count = Bytes::get_Java_u2((address)abase + count_off);
1267 const Symbol* const aname = check_symbol_at(cp, atype);
1268 if (aname == NULL) break; // invalid annotation name
1269 const Symbol* member = NULL;
1270 if (count >= 1) {
1271 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1272 member = check_symbol_at(cp, member_index);
1273 if (member == NULL) break; // invalid member name
1274 }
1275
1276 // Here is where parsing particular annotations will take place.
1277 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1278 if (AnnotationCollector::_unknown == id) continue;
1279 coll->set_annotation(id);
1280
1281 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1282 // @Contended can optionally specify the contention group.
1283 //
1284 // Contended group defines the equivalence class over the fields:
1285 // the fields within the same contended group are not treated distinct.
1286 // The only exception is default group, which does not incur the
1287 // equivalence. Naturally, contention group for classes is meaningless.
1288 //
1289 // While the contention group is specified as String, annotation
1290 // values are already interned, and we might as well use the constant
1291 // pool index as the group tag.
1292 //
1293 u2 group_index = 0; // default contended group
1294 if (count == 1
1295 && s_size == (index - index0) // match size
1296 && s_tag_val == *(abase + tag_off)
1297 && member == vmSymbols::value_name()) {
1298 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1299 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1300 group_index = 0; // default contended group
1301 }
1302 }
1303 coll->set_contended_group(group_index);
1304 }
1305 }
1306 }
1307
1308
1309 // Parse attributes for a field.
1310 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1311 u2 attributes_count,
1312 bool is_static, u2 signature_index,
1313 u2* const constantvalue_index_addr,
1314 bool* const is_synthetic_addr,
1315 u2* const generic_signature_index_addr,
1316 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1317 TRAPS) {
1318 assert(cfs != NULL, "invariant");
1319 assert(constantvalue_index_addr != NULL, "invariant");
1320 assert(is_synthetic_addr != NULL, "invariant");
1321 assert(generic_signature_index_addr != NULL, "invariant");
1322 assert(parsed_annotations != NULL, "invariant");
1323 assert(attributes_count > 0, "attributes_count should be greater than 0");
1324
1325 u2 constantvalue_index = 0;
1326 u2 generic_signature_index = 0;
1327 bool is_synthetic = false;
1328 const u1* runtime_visible_annotations = NULL;
1329 int runtime_visible_annotations_length = 0;
1330 const u1* runtime_invisible_annotations = NULL;
1331 int runtime_invisible_annotations_length = 0;
1332 const u1* runtime_visible_type_annotations = NULL;
1333 int runtime_visible_type_annotations_length = 0;
1334 const u1* runtime_invisible_type_annotations = NULL;
1335 int runtime_invisible_type_annotations_length = 0;
1336 bool runtime_invisible_annotations_exists = false;
1337 bool runtime_invisible_type_annotations_exists = false;
1338 const ConstantPool* const cp = _cp;
1339
1340 while (attributes_count--) {
1341 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1342 const u2 attribute_name_index = cfs->get_u2_fast();
1343 const u4 attribute_length = cfs->get_u4_fast();
1344 check_property(valid_symbol_at(attribute_name_index),
1345 "Invalid field attribute index %u in class file %s",
1346 attribute_name_index,
1347 CHECK);
1348
1349 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1350 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1351 // ignore if non-static
1352 if (constantvalue_index != 0) {
1353 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1354 }
1355 check_property(
1356 attribute_length == 2,
1357 "Invalid ConstantValue field attribute length %u in class file %s",
1358 attribute_length, CHECK);
1359
1360 constantvalue_index = cfs->get_u2(CHECK);
1361 if (_need_verify) {
1362 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1363 }
1364 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1365 if (attribute_length != 0) {
1366 classfile_parse_error(
1367 "Invalid Synthetic field attribute length %u in class file %s",
1368 attribute_length, CHECK);
1369 }
1370 is_synthetic = true;
1371 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1372 if (attribute_length != 0) {
1373 classfile_parse_error(
1374 "Invalid Deprecated field attribute length %u in class file %s",
1375 attribute_length, CHECK);
1376 }
1377 } else if (_major_version >= JAVA_1_5_VERSION) {
1378 if (attribute_name == vmSymbols::tag_signature()) {
1379 if (generic_signature_index != 0) {
1380 classfile_parse_error(
1381 "Multiple Signature attributes for field in class file %s", CHECK);
1382 }
1383 if (attribute_length != 2) {
1384 classfile_parse_error(
1385 "Wrong size %u for field's Signature attribute in class file %s",
1386 attribute_length, CHECK);
1387 }
1388 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1389 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1390 if (runtime_visible_annotations != NULL) {
1391 classfile_parse_error(
1392 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1393 }
1394 runtime_visible_annotations_length = attribute_length;
1395 runtime_visible_annotations = cfs->current();
1396 assert(runtime_visible_annotations != NULL, "null visible annotations");
1397 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1398 parse_annotations(cp,
1399 runtime_visible_annotations,
1400 runtime_visible_annotations_length,
1401 parsed_annotations,
1402 _loader_data,
1403 CHECK);
1404 cfs->skip_u1_fast(runtime_visible_annotations_length);
1405 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1406 if (runtime_invisible_annotations_exists) {
1407 classfile_parse_error(
1408 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1409 }
1410 runtime_invisible_annotations_exists = true;
1411 if (PreserveAllAnnotations) {
1412 runtime_invisible_annotations_length = attribute_length;
1413 runtime_invisible_annotations = cfs->current();
1414 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1415 }
1416 cfs->skip_u1(attribute_length, CHECK);
1417 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1418 if (runtime_visible_type_annotations != NULL) {
1419 classfile_parse_error(
1420 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1421 }
1422 runtime_visible_type_annotations_length = attribute_length;
1423 runtime_visible_type_annotations = cfs->current();
1424 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1425 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1426 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1427 if (runtime_invisible_type_annotations_exists) {
1428 classfile_parse_error(
1429 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1430 } else {
1431 runtime_invisible_type_annotations_exists = true;
1432 }
1433 if (PreserveAllAnnotations) {
1434 runtime_invisible_type_annotations_length = attribute_length;
1435 runtime_invisible_type_annotations = cfs->current();
1436 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1437 }
1438 cfs->skip_u1(attribute_length, CHECK);
1439 } else {
1440 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1441 }
1442 } else {
1443 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1444 }
1445 }
1446
1447 *constantvalue_index_addr = constantvalue_index;
1448 *is_synthetic_addr = is_synthetic;
1449 *generic_signature_index_addr = generic_signature_index;
1450 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1451 runtime_visible_annotations_length,
1452 runtime_invisible_annotations,
1453 runtime_invisible_annotations_length,
1454 CHECK);
1455 parsed_annotations->set_field_annotations(a);
1456 a = assemble_annotations(runtime_visible_type_annotations,
1457 runtime_visible_type_annotations_length,
1458 runtime_invisible_type_annotations,
1459 runtime_invisible_type_annotations_length,
1460 CHECK);
1461 parsed_annotations->set_field_type_annotations(a);
1462 return;
1463 }
1464
1465
1466 // Field allocation types. Used for computing field offsets.
1467
1468 enum FieldAllocationType {
1469 STATIC_OOP, // Oops
1470 STATIC_BYTE, // Boolean, Byte, char
1471 STATIC_SHORT, // shorts
1472 STATIC_WORD, // ints
1473 STATIC_DOUBLE, // aligned long or double
1474 STATIC_FLATTENABLE, // flattenable field
1475 NONSTATIC_OOP,
1476 NONSTATIC_BYTE,
1477 NONSTATIC_SHORT,
1478 NONSTATIC_WORD,
1479 NONSTATIC_DOUBLE,
1480 NONSTATIC_FLATTENABLE,
1481 MAX_FIELD_ALLOCATION_TYPE,
1482 BAD_ALLOCATION_TYPE = -1
1483 };
1484
1485 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1486 BAD_ALLOCATION_TYPE, // 0
1487 BAD_ALLOCATION_TYPE, // 1
1488 BAD_ALLOCATION_TYPE, // 2
1489 BAD_ALLOCATION_TYPE, // 3
1490 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1491 NONSTATIC_SHORT, // T_CHAR = 5,
1492 NONSTATIC_WORD, // T_FLOAT = 6,
1493 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1494 NONSTATIC_BYTE, // T_BYTE = 8,
1495 NONSTATIC_SHORT, // T_SHORT = 9,
1496 NONSTATIC_WORD, // T_INT = 10,
1497 NONSTATIC_DOUBLE, // T_LONG = 11,
1498 NONSTATIC_OOP, // T_OBJECT = 12,
1499 NONSTATIC_OOP, // T_ARRAY = 13,
1500 NONSTATIC_OOP, // T_VALUETYPE = 14,
1501 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1502 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1503 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1504 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1505 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1506 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1507 BAD_ALLOCATION_TYPE, // 0
1508 BAD_ALLOCATION_TYPE, // 1
1509 BAD_ALLOCATION_TYPE, // 2
1510 BAD_ALLOCATION_TYPE, // 3
1511 STATIC_BYTE , // T_BOOLEAN = 4,
1512 STATIC_SHORT, // T_CHAR = 5,
1513 STATIC_WORD, // T_FLOAT = 6,
1514 STATIC_DOUBLE, // T_DOUBLE = 7,
1515 STATIC_BYTE, // T_BYTE = 8,
1516 STATIC_SHORT, // T_SHORT = 9,
1517 STATIC_WORD, // T_INT = 10,
1518 STATIC_DOUBLE, // T_LONG = 11,
1519 STATIC_OOP, // T_OBJECT = 12,
1520 STATIC_OOP, // T_ARRAY = 13,
1521 STATIC_OOP, // T_VALUETYPE = 14,
1522 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1523 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1524 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1525 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1526 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1527 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1528 };
1529
1530 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1531 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1532 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1533 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1534 if (is_flattenable) {
1535 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1536 }
1537 return result;
1538 }
1539
1540 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1541 public:
1542 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1543
1544 FieldAllocationCount() {
1545 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1546 count[i] = 0;
1547 }
1548 }
1549
1550 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1551 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1552 if (atype != BAD_ALLOCATION_TYPE) {
1553 // Make sure there is no overflow with injected fields.
1554 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1555 count[atype]++;
1556 }
1557 return atype;
1558 }
1559 };
1560
1561 // Side-effects: populates the _fields, _fields_annotations,
1562 // _fields_type_annotations fields
1563 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1564 bool is_interface,
1565 bool is_value_type,
1566 FieldAllocationCount* const fac,
1567 ConstantPool* cp,
1568 const int cp_size,
1569 u2* const java_fields_count_ptr,
1570 TRAPS) {
1571
1572 assert(cfs != NULL, "invariant");
1573 assert(fac != NULL, "invariant");
1574 assert(cp != NULL, "invariant");
1575 assert(java_fields_count_ptr != NULL, "invariant");
1576
1577 assert(NULL == _fields, "invariant");
1578 assert(NULL == _fields_annotations, "invariant");
1579 assert(NULL == _fields_type_annotations, "invariant");
1580
1581 cfs->guarantee_more(2, CHECK); // length
1582 const u2 length = cfs->get_u2_fast();
1583 *java_fields_count_ptr = length;
1584
1585 int num_injected = 0;
1586 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1587 &num_injected);
1588
1589 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1590
1591 // The field array starts with tuples of shorts
1592 // [access, name index, sig index, initial value index, byte offset].
1593 // A generic signature slot only exists for field with generic
1594 // signature attribute. And the access flag is set with
1595 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1596 // signature slots are at the end of the field array and after all
1597 // other fields data.
1598 //
1599 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1600 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1601 // ...
1602 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1603 // [generic signature index]
1604 // [generic signature index]
1605 // ...
1606 //
1607 // Allocate a temporary resource array for field data. For each field,
1608 // a slot is reserved in the temporary array for the generic signature
1609 // index. After parsing all fields, the data are copied to a permanent
1610 // array and any unused slots will be discarded.
1611 ResourceMark rm(THREAD);
1612 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1613 u2,
1614 total_fields * (FieldInfo::field_slots + 1));
1615
1616 // The generic signature slots start after all other fields' data.
1617 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1618 int num_generic_signature = 0;
1619 for (int n = 0; n < length; n++) {
1620 // access_flags, name_index, descriptor_index, attributes_count
1621 cfs->guarantee_more(8, CHECK);
1622
1623 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1624
1625 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1626 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1627 AccessFlags access_flags;
1628 access_flags.set_flags(flags);
1629
1630 const u2 name_index = cfs->get_u2_fast();
1631 check_property(valid_symbol_at(name_index),
1632 "Invalid constant pool index %u for field name in class file %s",
1633 name_index, CHECK);
1634 const Symbol* const name = cp->symbol_at(name_index);
1635 verify_legal_field_name(name, CHECK);
1636
1637 const u2 signature_index = cfs->get_u2_fast();
1638 check_property(valid_symbol_at(signature_index),
1639 "Invalid constant pool index %u for field signature in class file %s",
1640 signature_index, CHECK);
1641 const Symbol* const sig = cp->symbol_at(signature_index);
1642 verify_legal_field_signature(name, sig, CHECK);
1643 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1644 if (sig->is_Q_signature()) {
1645 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1646 access_flags.set_is_flattenable();
1647 }
1648 if (access_flags.is_flattenable()) {
1649 // Array flattenability cannot be specified. Arrays of value classes are
1650 // are always flattenable. Arrays of other classes are not flattenable.
1651 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1652 classfile_parse_error(
1653 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1654 " ACC_FLATTENABLE cannot be specified for an array",
1655 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1656 }
1657 _has_flattenable_fields = true;
1658 }
1659
1660 u2 constantvalue_index = 0;
1661 bool is_synthetic = false;
1662 u2 generic_signature_index = 0;
1663 const bool is_static = access_flags.is_static();
1664 FieldAnnotationCollector parsed_annotations(_loader_data);
1665
1666 const u2 attributes_count = cfs->get_u2_fast();
1667 if (attributes_count > 0) {
1668 parse_field_attributes(cfs,
1669 attributes_count,
1670 is_static,
1671 signature_index,
1672 &constantvalue_index,
1673 &is_synthetic,
1674 &generic_signature_index,
1675 &parsed_annotations,
1676 CHECK);
1677
1678 if (parsed_annotations.field_annotations() != NULL) {
1679 if (_fields_annotations == NULL) {
1680 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1681 _loader_data, length, NULL,
1682 CHECK);
1683 }
1684 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1685 parsed_annotations.set_field_annotations(NULL);
1686 }
1687 if (parsed_annotations.field_type_annotations() != NULL) {
1688 if (_fields_type_annotations == NULL) {
1689 _fields_type_annotations =
1690 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1691 length,
1692 NULL,
1693 CHECK);
1694 }
1695 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1696 parsed_annotations.set_field_type_annotations(NULL);
1697 }
1698
1699 if (is_synthetic) {
1700 access_flags.set_is_synthetic();
1701 }
1702 if (generic_signature_index != 0) {
1703 access_flags.set_field_has_generic_signature();
1704 fa[generic_signature_slot] = generic_signature_index;
1705 generic_signature_slot ++;
1706 num_generic_signature ++;
1707 }
1708 }
1709
1710 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1711 field->initialize(access_flags.as_short(),
1712 name_index,
1713 signature_index,
1714 constantvalue_index);
1715 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1716
1717 // Remember how many oops we encountered and compute allocation type
1718 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1719 field->set_allocation_type(atype);
1720
1721 // After field is initialized with type, we can augment it with aux info
1722 if (parsed_annotations.has_any_annotations())
1723 parsed_annotations.apply_to(field);
1724 }
1725
1726 int index = length;
1727 if (num_injected != 0) {
1728 for (int n = 0; n < num_injected; n++) {
1729 // Check for duplicates
1730 if (injected[n].may_be_java) {
1731 const Symbol* const name = injected[n].name();
1732 const Symbol* const signature = injected[n].signature();
1733 bool duplicate = false;
1734 for (int i = 0; i < length; i++) {
1735 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1736 if (name == cp->symbol_at(f->name_index()) &&
1737 signature == cp->symbol_at(f->signature_index())) {
1738 // Symbol is desclared in Java so skip this one
1739 duplicate = true;
1740 break;
1741 }
1742 }
1743 if (duplicate) {
1744 // These will be removed from the field array at the end
1745 continue;
1746 }
1747 }
1748
1749 // Injected field
1750 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1751 field->initialize(JVM_ACC_FIELD_INTERNAL,
1752 injected[n].name_index,
1753 injected[n].signature_index,
1754 0);
1755
1756 const BasicType type = FieldType::basic_type(injected[n].signature());
1757
1758 // Remember how many oops we encountered and compute allocation type
1759 const FieldAllocationType atype = fac->update(false, type, false);
1760 field->set_allocation_type(atype);
1761 index++;
1762 }
1763 }
1764
1765 if (is_value_type) {
1766 index = length + num_injected;
1767 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1768 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1769 vmSymbols::default_value_name_enum,
1770 vmSymbols::java_lang_Object_enum,
1771 0);
1772 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1773 const FieldAllocationType atype = fac->update(true, type, false);
1774 field->set_allocation_type(atype);
1775 index++;
1776 }
1777
1778 assert(NULL == _fields, "invariant");
1779
1780 _fields =
1781 MetadataFactory::new_array<u2>(_loader_data,
1782 index * FieldInfo::field_slots + num_generic_signature,
1783 CHECK);
1784 // Sometimes injected fields already exist in the Java source so
1785 // the fields array could be too long. In that case the
1786 // fields array is trimed. Also unused slots that were reserved
1787 // for generic signature indexes are discarded.
1788 {
1789 int i = 0;
1790 for (; i < index * FieldInfo::field_slots; i++) {
1791 _fields->at_put(i, fa[i]);
1792 }
1793 for (int j = total_fields * FieldInfo::field_slots;
1794 j < generic_signature_slot; j++) {
1795 _fields->at_put(i++, fa[j]);
1796 }
1797 assert(_fields->length() == i, "");
1798 }
1799
1800 if (_need_verify && length > 1) {
1801 // Check duplicated fields
1802 ResourceMark rm(THREAD);
1803 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1804 THREAD, NameSigHash*, HASH_ROW_SIZE);
1805 initialize_hashtable(names_and_sigs);
1806 bool dup = false;
1807 const Symbol* name = NULL;
1808 const Symbol* sig = NULL;
1809 {
1810 debug_only(NoSafepointVerifier nsv;)
1811 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1812 name = fs.name();
1813 sig = fs.signature();
1814 // If no duplicates, add name/signature in hashtable names_and_sigs.
1815 if (!put_after_lookup(name, sig, names_and_sigs)) {
1816 dup = true;
1817 break;
1818 }
1819 }
1820 }
1821 if (dup) {
1822 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1823 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1824 }
1825 }
1826 }
1827
1828
1829 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1830 u4 code_length,
1831 u4 exception_table_length,
1832 TRAPS) {
1833 assert(cfs != NULL, "invariant");
1834
1835 const unsafe_u2* const exception_table_start = cfs->current();
1836 assert(exception_table_start != NULL, "null exception table");
1837
1838 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1839 // end_pc,
1840 // handler_pc,
1841 // catch_type_index
1842
1843 // Will check legal target after parsing code array in verifier.
1844 if (_need_verify) {
1845 for (unsigned int i = 0; i < exception_table_length; i++) {
1846 const u2 start_pc = cfs->get_u2_fast();
1847 const u2 end_pc = cfs->get_u2_fast();
1848 const u2 handler_pc = cfs->get_u2_fast();
1849 const u2 catch_type_index = cfs->get_u2_fast();
1850 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1851 "Illegal exception table range in class file %s",
1852 CHECK_NULL);
1853 guarantee_property(handler_pc < code_length,
1854 "Illegal exception table handler in class file %s",
1855 CHECK_NULL);
1856 if (catch_type_index != 0) {
1857 guarantee_property(valid_klass_reference_at(catch_type_index),
1858 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1859 }
1860 }
1861 } else {
1862 cfs->skip_u2_fast(exception_table_length * 4);
1863 }
1864 return exception_table_start;
1865 }
1866
1867 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1868 u4 code_length,
1869 CompressedLineNumberWriteStream**const write_stream,
1870 TRAPS) {
1871
1872 const ClassFileStream* const cfs = _stream;
1873 unsigned int num_entries = cfs->get_u2(CHECK);
1874
1875 // Each entry is a u2 start_pc, and a u2 line_number
1876 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1877
1878 // Verify line number attribute and table length
1879 check_property(
1880 code_attribute_length == sizeof(u2) + length_in_bytes,
1881 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1882
1883 cfs->guarantee_more(length_in_bytes, CHECK);
1884
1885 if ((*write_stream) == NULL) {
1886 if (length_in_bytes > fixed_buffer_size) {
1887 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1888 } else {
1889 (*write_stream) = new CompressedLineNumberWriteStream(
1890 _linenumbertable_buffer, fixed_buffer_size);
1891 }
1892 }
1893
1894 while (num_entries-- > 0) {
1895 const u2 bci = cfs->get_u2_fast(); // start_pc
1896 const u2 line = cfs->get_u2_fast(); // line_number
1897 guarantee_property(bci < code_length,
1898 "Invalid pc in LineNumberTable in class file %s", CHECK);
1899 (*write_stream)->write_pair(bci, line);
1900 }
1901 }
1902
1903
1904 class LVT_Hash : public AllStatic {
1905 public:
1906
1907 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1908 /*
1909 * 3-tuple start_bci/length/slot has to be unique key,
1910 * so the following comparison seems to be redundant:
1911 * && elem->name_cp_index == entry->_elem->name_cp_index
1912 */
1913 return (e0.start_bci == e1.start_bci &&
1914 e0.length == e1.length &&
1915 e0.name_cp_index == e1.name_cp_index &&
1916 e0.slot == e1.slot);
1917 }
1918
1919 static unsigned int hash(LocalVariableTableElement const& e0) {
1920 unsigned int raw_hash = e0.start_bci;
1921
1922 raw_hash = e0.length + raw_hash * 37;
1923 raw_hash = e0.name_cp_index + raw_hash * 37;
1924 raw_hash = e0.slot + raw_hash * 37;
1925
1926 return raw_hash;
1927 }
1928 };
1929
1930
1931 // Class file LocalVariableTable elements.
1932 class Classfile_LVT_Element {
1933 public:
1934 u2 start_bci;
1935 u2 length;
1936 u2 name_cp_index;
1937 u2 descriptor_cp_index;
1938 u2 slot;
1939 };
1940
1941 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1942 LocalVariableTableElement* const lvt) {
1943 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1944 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1945 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1946 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1947 lvt->signature_cp_index = 0;
1948 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1949 }
1950
1951 // Function is used to parse both attributes:
1952 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1953 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1954 u4 code_length,
1955 u2 max_locals,
1956 u4 code_attribute_length,
1957 u2* const localvariable_table_length,
1958 bool isLVTT,
1959 TRAPS) {
1960 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1961 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1962 const unsigned int size =
1963 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1964
1965 const ConstantPool* const cp = _cp;
1966
1967 // Verify local variable table attribute has right length
1968 if (_need_verify) {
1969 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1970 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1971 }
1972
1973 const unsafe_u2* const localvariable_table_start = cfs->current();
1974 assert(localvariable_table_start != NULL, "null local variable table");
1975 if (!_need_verify) {
1976 cfs->skip_u2_fast(size);
1977 } else {
1978 cfs->guarantee_more(size * 2, CHECK_NULL);
1979 for(int i = 0; i < (*localvariable_table_length); i++) {
1980 const u2 start_pc = cfs->get_u2_fast();
1981 const u2 length = cfs->get_u2_fast();
1982 const u2 name_index = cfs->get_u2_fast();
1983 const u2 descriptor_index = cfs->get_u2_fast();
1984 const u2 index = cfs->get_u2_fast();
1985 // Assign to a u4 to avoid overflow
1986 const u4 end_pc = (u4)start_pc + (u4)length;
1987
1988 if (start_pc >= code_length) {
1989 classfile_parse_error(
1990 "Invalid start_pc %u in %s in class file %s",
1991 start_pc, tbl_name, CHECK_NULL);
1992 }
1993 if (end_pc > code_length) {
1994 classfile_parse_error(
1995 "Invalid length %u in %s in class file %s",
1996 length, tbl_name, CHECK_NULL);
1997 }
1998 const int cp_size = cp->length();
1999 guarantee_property(valid_symbol_at(name_index),
2000 "Name index %u in %s has bad constant type in class file %s",
2001 name_index, tbl_name, CHECK_NULL);
2002 guarantee_property(valid_symbol_at(descriptor_index),
2003 "Signature index %u in %s has bad constant type in class file %s",
2004 descriptor_index, tbl_name, CHECK_NULL);
2005
2006 const Symbol* const name = cp->symbol_at(name_index);
2007 const Symbol* const sig = cp->symbol_at(descriptor_index);
2008 verify_legal_field_name(name, CHECK_NULL);
2009 u2 extra_slot = 0;
2010 if (!isLVTT) {
2011 verify_legal_field_signature(name, sig, CHECK_NULL);
2012
2013 // 4894874: check special cases for double and long local variables
2014 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2015 sig == vmSymbols::type_signature(T_LONG)) {
2016 extra_slot = 1;
2017 }
2018 }
2019 guarantee_property((index + extra_slot) < max_locals,
2020 "Invalid index %u in %s in class file %s",
2021 index, tbl_name, CHECK_NULL);
2022 }
2023 }
2024 return localvariable_table_start;
2025 }
2026
2027 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2028 u4 code_attribute_length,
2029 bool need_verify,
2030 TRAPS) {
2031 assert(cfs != NULL, "invariant");
2032
2033 if (0 == code_attribute_length) {
2034 return NULL;
2035 }
2036
2037 const u1* const stackmap_table_start = cfs->current();
2038 assert(stackmap_table_start != NULL, "null stackmap table");
2039
2040 // check code_attribute_length first
2041 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2042
2043 if (!need_verify && !DumpSharedSpaces) {
2044 return NULL;
2045 }
2046 return stackmap_table_start;
2047 }
2048
2049 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2050 u2* const checked_exceptions_length,
2051 u4 method_attribute_length,
2052 TRAPS) {
2053 assert(cfs != NULL, "invariant");
2054 assert(checked_exceptions_length != NULL, "invariant");
2055
2056 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2057 *checked_exceptions_length = cfs->get_u2_fast();
2058 const unsigned int size =
2059 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2060 const unsafe_u2* const checked_exceptions_start = cfs->current();
2061 assert(checked_exceptions_start != NULL, "null checked exceptions");
2062 if (!_need_verify) {
2063 cfs->skip_u2_fast(size);
2064 } else {
2065 // Verify each value in the checked exception table
2066 u2 checked_exception;
2067 const u2 len = *checked_exceptions_length;
2068 cfs->guarantee_more(2 * len, CHECK_NULL);
2069 for (int i = 0; i < len; i++) {
2070 checked_exception = cfs->get_u2_fast();
2071 check_property(
2072 valid_klass_reference_at(checked_exception),
2073 "Exception name has bad type at constant pool %u in class file %s",
2074 checked_exception, CHECK_NULL);
2075 }
2076 }
2077 // check exceptions attribute length
2078 if (_need_verify) {
2079 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2080 sizeof(u2) * size),
2081 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2082 }
2083 return checked_exceptions_start;
2084 }
2085
2086 void ClassFileParser::throwIllegalSignature(const char* type,
2087 const Symbol* name,
2088 const Symbol* sig,
2089 TRAPS) const {
2090 assert(name != NULL, "invariant");
2091 assert(sig != NULL, "invariant");
2092
2093 ResourceMark rm(THREAD);
2094 Exceptions::fthrow(THREAD_AND_LOCATION,
2095 vmSymbols::java_lang_ClassFormatError(),
2096 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2097 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2098 }
2099
2100 AnnotationCollector::ID
2101 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2102 const Symbol* name) {
2103 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2104 // Privileged code can use all annotations. Other code silently drops some.
2105 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2106 loader_data->is_platform_class_loader_data() ||
2107 loader_data->is_unsafe_anonymous();
2108 switch (sid) {
2109 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2110 if (_location != _in_method) break; // only allow for methods
2111 if (!privileged) break; // only allow in privileged code
2112 return _method_CallerSensitive;
2113 }
2114 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2115 if (_location != _in_method) break; // only allow for methods
2116 if (!privileged) break; // only allow in privileged code
2117 return _method_ForceInline;
2118 }
2119 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2120 if (_location != _in_method) break; // only allow for methods
2121 if (!privileged) break; // only allow in privileged code
2122 return _method_DontInline;
2123 }
2124 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2125 if (_location != _in_method) break; // only allow for methods
2126 if (!privileged) break; // only allow in privileged code
2127 return _method_InjectedProfile;
2128 }
2129 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2130 if (_location != _in_method) break; // only allow for methods
2131 if (!privileged) break; // only allow in privileged code
2132 return _method_LambdaForm_Compiled;
2133 }
2134 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2135 if (_location != _in_method) break; // only allow for methods
2136 if (!privileged) break; // only allow in privileged code
2137 return _method_Hidden;
2138 }
2139 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2140 if (_location != _in_method) break; // only allow for methods
2141 if (!privileged) break; // only allow in privileged code
2142 return _method_HotSpotIntrinsicCandidate;
2143 }
2144 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2145 if (_location != _in_field) break; // only allow for fields
2146 if (!privileged) break; // only allow in privileged code
2147 return _field_Stable;
2148 }
2149 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2150 if (_location != _in_field && _location != _in_class) {
2151 break; // only allow for fields and classes
2152 }
2153 if (!EnableContended || (RestrictContended && !privileged)) {
2154 break; // honor privileges
2155 }
2156 return _jdk_internal_vm_annotation_Contended;
2157 }
2158 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2159 if (_location != _in_method) break; // only allow for methods
2160 if (RestrictReservedStack && !privileged) break; // honor privileges
2161 return _jdk_internal_vm_annotation_ReservedStackAccess;
2162 }
2163 default: {
2164 break;
2165 }
2166 }
2167 return AnnotationCollector::_unknown;
2168 }
2169
2170 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2171 if (is_contended())
2172 f->set_contended_group(contended_group());
2173 if (is_stable())
2174 f->set_stable(true);
2175 }
2176
2177 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2178 // If there's an error deallocate metadata for field annotations
2179 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2180 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2181 }
2182
2183 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2184 if (has_annotation(_method_CallerSensitive))
2185 m->set_caller_sensitive(true);
2186 if (has_annotation(_method_ForceInline))
2187 m->set_force_inline(true);
2188 if (has_annotation(_method_DontInline))
2189 m->set_dont_inline(true);
2190 if (has_annotation(_method_InjectedProfile))
2191 m->set_has_injected_profile(true);
2192 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2193 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2194 if (has_annotation(_method_Hidden))
2195 m->set_hidden(true);
2196 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2197 m->set_intrinsic_candidate(true);
2198 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2199 m->set_has_reserved_stack_access(true);
2200 }
2201
2202 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2203 assert(ik != NULL, "invariant");
2204 ik->set_is_contended(is_contended());
2205 }
2206
2207 #define MAX_ARGS_SIZE 255
2208 #define MAX_CODE_SIZE 65535
2209 #define INITIAL_MAX_LVT_NUMBER 256
2210
2211 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2212 *
2213 * Rules for LVT's and LVTT's are:
2214 * - There can be any number of LVT's and LVTT's.
2215 * - If there are n LVT's, it is the same as if there was just
2216 * one LVT containing all the entries from the n LVT's.
2217 * - There may be no more than one LVT entry per local variable.
2218 * Two LVT entries are 'equal' if these fields are the same:
2219 * start_pc, length, name, slot
2220 * - There may be no more than one LVTT entry per each LVT entry.
2221 * Each LVTT entry has to match some LVT entry.
2222 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2223 */
2224 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2225 int lvt_cnt,
2226 u2* const localvariable_table_length,
2227 const unsafe_u2** const localvariable_table_start,
2228 int lvtt_cnt,
2229 u2* const localvariable_type_table_length,
2230 const unsafe_u2** const localvariable_type_table_start,
2231 TRAPS) {
2232
2233 ResourceMark rm(THREAD);
2234
2235 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2236 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2237
2238 LVT_HashTable* const table = new LVT_HashTable();
2239
2240 // To fill LocalVariableTable in
2241 const Classfile_LVT_Element* cf_lvt;
2242 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2243
2244 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2245 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2246 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2247 copy_lvt_element(&cf_lvt[idx], lvt);
2248 // If no duplicates, add LVT elem in hashtable.
2249 if (table->put(*lvt, lvt) == false
2250 && _need_verify
2251 && _major_version >= JAVA_1_5_VERSION) {
2252 classfile_parse_error("Duplicated LocalVariableTable attribute "
2253 "entry for '%s' in class file %s",
2254 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2255 CHECK);
2256 }
2257 }
2258 }
2259
2260 // To merge LocalVariableTable and LocalVariableTypeTable
2261 const Classfile_LVT_Element* cf_lvtt;
2262 LocalVariableTableElement lvtt_elem;
2263
2264 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2265 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2266 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2267 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2268 LocalVariableTableElement** entry = table->get(lvtt_elem);
2269 if (entry == NULL) {
2270 if (_need_verify) {
2271 classfile_parse_error("LVTT entry for '%s' in class file %s "
2272 "does not match any LVT entry",
2273 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2274 CHECK);
2275 }
2276 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2277 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2278 "entry for '%s' in class file %s",
2279 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2280 CHECK);
2281 } else {
2282 // to add generic signatures into LocalVariableTable
2283 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2284 }
2285 }
2286 }
2287 }
2288
2289
2290 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2291 const u1* runtime_visible_annotations,
2292 int runtime_visible_annotations_length,
2293 const u1* runtime_invisible_annotations,
2294 int runtime_invisible_annotations_length,
2295 const u1* runtime_visible_parameter_annotations,
2296 int runtime_visible_parameter_annotations_length,
2297 const u1* runtime_invisible_parameter_annotations,
2298 int runtime_invisible_parameter_annotations_length,
2299 const u1* runtime_visible_type_annotations,
2300 int runtime_visible_type_annotations_length,
2301 const u1* runtime_invisible_type_annotations,
2302 int runtime_invisible_type_annotations_length,
2303 const u1* annotation_default,
2304 int annotation_default_length,
2305 TRAPS) {
2306
2307 AnnotationArray* a;
2308
2309 if (runtime_visible_annotations_length +
2310 runtime_invisible_annotations_length > 0) {
2311 a = assemble_annotations(runtime_visible_annotations,
2312 runtime_visible_annotations_length,
2313 runtime_invisible_annotations,
2314 runtime_invisible_annotations_length,
2315 CHECK);
2316 cm->set_method_annotations(a);
2317 }
2318
2319 if (runtime_visible_parameter_annotations_length +
2320 runtime_invisible_parameter_annotations_length > 0) {
2321 a = assemble_annotations(runtime_visible_parameter_annotations,
2322 runtime_visible_parameter_annotations_length,
2323 runtime_invisible_parameter_annotations,
2324 runtime_invisible_parameter_annotations_length,
2325 CHECK);
2326 cm->set_parameter_annotations(a);
2327 }
2328
2329 if (annotation_default_length > 0) {
2330 a = assemble_annotations(annotation_default,
2331 annotation_default_length,
2332 NULL,
2333 0,
2334 CHECK);
2335 cm->set_default_annotations(a);
2336 }
2337
2338 if (runtime_visible_type_annotations_length +
2339 runtime_invisible_type_annotations_length > 0) {
2340 a = assemble_annotations(runtime_visible_type_annotations,
2341 runtime_visible_type_annotations_length,
2342 runtime_invisible_type_annotations,
2343 runtime_invisible_type_annotations_length,
2344 CHECK);
2345 cm->set_type_annotations(a);
2346 }
2347 }
2348
2349
2350 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2351 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2352 // Method* to save footprint, so we only know the size of the resulting Method* when the
2353 // entire method attribute is parsed.
2354 //
2355 // The promoted_flags parameter is used to pass relevant access_flags
2356 // from the method back up to the containing klass. These flag values
2357 // are added to klass's access_flags.
2358
2359 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2360 bool is_interface,
2361 bool is_value_type,
2362 const ConstantPool* cp,
2363 AccessFlags* const promoted_flags,
2364 TRAPS) {
2365 assert(cfs != NULL, "invariant");
2366 assert(cp != NULL, "invariant");
2367 assert(promoted_flags != NULL, "invariant");
2368
2369 ResourceMark rm(THREAD);
2370 // Parse fixed parts:
2371 // access_flags, name_index, descriptor_index, attributes_count
2372 cfs->guarantee_more(8, CHECK_NULL);
2373
2374 int flags = cfs->get_u2_fast();
2375 const u2 name_index = cfs->get_u2_fast();
2376 const int cp_size = cp->length();
2377 check_property(
2378 valid_symbol_at(name_index),
2379 "Illegal constant pool index %u for method name in class file %s",
2380 name_index, CHECK_NULL);
2381 const Symbol* const name = cp->symbol_at(name_index);
2382 verify_legal_method_name(name, CHECK_NULL);
2383
2384 const u2 signature_index = cfs->get_u2_fast();
2385 guarantee_property(
2386 valid_symbol_at(signature_index),
2387 "Illegal constant pool index %u for method signature in class file %s",
2388 signature_index, CHECK_NULL);
2389 const Symbol* const signature = cp->symbol_at(signature_index);
2390
2391 if (name == vmSymbols::class_initializer_name()) {
2392 // We ignore the other access flags for a valid class initializer.
2393 // (JVM Spec 2nd ed., chapter 4.6)
2394 if (_major_version < 51) { // backward compatibility
2395 flags = JVM_ACC_STATIC;
2396 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2397 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2398 } else {
2399 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2400 }
2401 } else {
2402 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2403 }
2404
2405 if (name == vmSymbols::object_initializer_name()) {
2406 if (is_interface) {
2407 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2408 /* TBD: uncomment when javac stops generating <init>() for value types.
2409 } else if (is_value_type) {
2410 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL);
2411 */
2412 }
2413 }
2414
2415 int args_size = -1; // only used when _need_verify is true
2416 if (_need_verify) {
2417 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2418 verify_legal_method_signature(name, signature, CHECK_NULL);
2419 if (args_size > MAX_ARGS_SIZE) {
2420 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2421 }
2422 }
2423
2424 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2425
2426 // Default values for code and exceptions attribute elements
2427 u2 max_stack = 0;
2428 u2 max_locals = 0;
2429 u4 code_length = 0;
2430 const u1* code_start = 0;
2431 u2 exception_table_length = 0;
2432 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2433 Array<int>* exception_handlers = Universe::the_empty_int_array();
2434 u2 checked_exceptions_length = 0;
2435 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2436 CompressedLineNumberWriteStream* linenumber_table = NULL;
2437 int linenumber_table_length = 0;
2438 int total_lvt_length = 0;
2439 u2 lvt_cnt = 0;
2440 u2 lvtt_cnt = 0;
2441 bool lvt_allocated = false;
2442 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2443 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2444 u2* localvariable_table_length = NULL;
2445 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2446 u2* localvariable_type_table_length = NULL;
2447 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2448 int method_parameters_length = -1;
2449 const u1* method_parameters_data = NULL;
2450 bool method_parameters_seen = false;
2451 bool parsed_code_attribute = false;
2452 bool parsed_checked_exceptions_attribute = false;
2453 bool parsed_stackmap_attribute = false;
2454 // stackmap attribute - JDK1.5
2455 const u1* stackmap_data = NULL;
2456 int stackmap_data_length = 0;
2457 u2 generic_signature_index = 0;
2458 MethodAnnotationCollector parsed_annotations;
2459 const u1* runtime_visible_annotations = NULL;
2460 int runtime_visible_annotations_length = 0;
2461 const u1* runtime_invisible_annotations = NULL;
2462 int runtime_invisible_annotations_length = 0;
2463 const u1* runtime_visible_parameter_annotations = NULL;
2464 int runtime_visible_parameter_annotations_length = 0;
2465 const u1* runtime_invisible_parameter_annotations = NULL;
2466 int runtime_invisible_parameter_annotations_length = 0;
2467 const u1* runtime_visible_type_annotations = NULL;
2468 int runtime_visible_type_annotations_length = 0;
2469 const u1* runtime_invisible_type_annotations = NULL;
2470 int runtime_invisible_type_annotations_length = 0;
2471 bool runtime_invisible_annotations_exists = false;
2472 bool runtime_invisible_type_annotations_exists = false;
2473 bool runtime_invisible_parameter_annotations_exists = false;
2474 const u1* annotation_default = NULL;
2475 int annotation_default_length = 0;
2476
2477 // Parse code and exceptions attribute
2478 u2 method_attributes_count = cfs->get_u2_fast();
2479 while (method_attributes_count--) {
2480 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2481 const u2 method_attribute_name_index = cfs->get_u2_fast();
2482 const u4 method_attribute_length = cfs->get_u4_fast();
2483 check_property(
2484 valid_symbol_at(method_attribute_name_index),
2485 "Invalid method attribute name index %u in class file %s",
2486 method_attribute_name_index, CHECK_NULL);
2487
2488 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2489 if (method_attribute_name == vmSymbols::tag_code()) {
2490 // Parse Code attribute
2491 if (_need_verify) {
2492 guarantee_property(
2493 !access_flags.is_native() && !access_flags.is_abstract(),
2494 "Code attribute in native or abstract methods in class file %s",
2495 CHECK_NULL);
2496 }
2497 if (parsed_code_attribute) {
2498 classfile_parse_error("Multiple Code attributes in class file %s",
2499 CHECK_NULL);
2500 }
2501 parsed_code_attribute = true;
2502
2503 // Stack size, locals size, and code size
2504 if (_major_version == 45 && _minor_version <= 2) {
2505 cfs->guarantee_more(4, CHECK_NULL);
2506 max_stack = cfs->get_u1_fast();
2507 max_locals = cfs->get_u1_fast();
2508 code_length = cfs->get_u2_fast();
2509 } else {
2510 cfs->guarantee_more(8, CHECK_NULL);
2511 max_stack = cfs->get_u2_fast();
2512 max_locals = cfs->get_u2_fast();
2513 code_length = cfs->get_u4_fast();
2514 }
2515 if (_need_verify) {
2516 guarantee_property(args_size <= max_locals,
2517 "Arguments can't fit into locals in class file %s",
2518 CHECK_NULL);
2519 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2520 "Invalid method Code length %u in class file %s",
2521 code_length, CHECK_NULL);
2522 }
2523 // Code pointer
2524 code_start = cfs->current();
2525 assert(code_start != NULL, "null code start");
2526 cfs->guarantee_more(code_length, CHECK_NULL);
2527 cfs->skip_u1_fast(code_length);
2528
2529 // Exception handler table
2530 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2531 exception_table_length = cfs->get_u2_fast();
2532 if (exception_table_length > 0) {
2533 exception_table_start = parse_exception_table(cfs,
2534 code_length,
2535 exception_table_length,
2536 CHECK_NULL);
2537 }
2538
2539 // Parse additional attributes in code attribute
2540 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2541 u2 code_attributes_count = cfs->get_u2_fast();
2542
2543 unsigned int calculated_attribute_length = 0;
2544
2545 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2546 calculated_attribute_length =
2547 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2548 } else {
2549 // max_stack, locals and length are smaller in pre-version 45.2 classes
2550 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2551 }
2552 calculated_attribute_length +=
2553 code_length +
2554 sizeof(exception_table_length) +
2555 sizeof(code_attributes_count) +
2556 exception_table_length *
2557 ( sizeof(u2) + // start_pc
2558 sizeof(u2) + // end_pc
2559 sizeof(u2) + // handler_pc
2560 sizeof(u2) ); // catch_type_index
2561
2562 while (code_attributes_count--) {
2563 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2564 const u2 code_attribute_name_index = cfs->get_u2_fast();
2565 const u4 code_attribute_length = cfs->get_u4_fast();
2566 calculated_attribute_length += code_attribute_length +
2567 sizeof(code_attribute_name_index) +
2568 sizeof(code_attribute_length);
2569 check_property(valid_symbol_at(code_attribute_name_index),
2570 "Invalid code attribute name index %u in class file %s",
2571 code_attribute_name_index,
2572 CHECK_NULL);
2573 if (LoadLineNumberTables &&
2574 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2575 // Parse and compress line number table
2576 parse_linenumber_table(code_attribute_length,
2577 code_length,
2578 &linenumber_table,
2579 CHECK_NULL);
2580
2581 } else if (LoadLocalVariableTables &&
2582 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2583 // Parse local variable table
2584 if (!lvt_allocated) {
2585 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2586 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2587 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2588 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2589 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2590 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2591 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2592 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2593 lvt_allocated = true;
2594 }
2595 if (lvt_cnt == max_lvt_cnt) {
2596 max_lvt_cnt <<= 1;
2597 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2598 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2599 }
2600 localvariable_table_start[lvt_cnt] =
2601 parse_localvariable_table(cfs,
2602 code_length,
2603 max_locals,
2604 code_attribute_length,
2605 &localvariable_table_length[lvt_cnt],
2606 false, // is not LVTT
2607 CHECK_NULL);
2608 total_lvt_length += localvariable_table_length[lvt_cnt];
2609 lvt_cnt++;
2610 } else if (LoadLocalVariableTypeTables &&
2611 _major_version >= JAVA_1_5_VERSION &&
2612 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2613 if (!lvt_allocated) {
2614 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2615 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2616 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2617 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2618 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2619 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2620 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2621 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2622 lvt_allocated = true;
2623 }
2624 // Parse local variable type table
2625 if (lvtt_cnt == max_lvtt_cnt) {
2626 max_lvtt_cnt <<= 1;
2627 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2628 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2629 }
2630 localvariable_type_table_start[lvtt_cnt] =
2631 parse_localvariable_table(cfs,
2632 code_length,
2633 max_locals,
2634 code_attribute_length,
2635 &localvariable_type_table_length[lvtt_cnt],
2636 true, // is LVTT
2637 CHECK_NULL);
2638 lvtt_cnt++;
2639 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2640 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2641 // Stack map is only needed by the new verifier in JDK1.5.
2642 if (parsed_stackmap_attribute) {
2643 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2644 }
2645 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2646 stackmap_data_length = code_attribute_length;
2647 parsed_stackmap_attribute = true;
2648 } else {
2649 // Skip unknown attributes
2650 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2651 }
2652 }
2653 // check method attribute length
2654 if (_need_verify) {
2655 guarantee_property(method_attribute_length == calculated_attribute_length,
2656 "Code segment has wrong length in class file %s",
2657 CHECK_NULL);
2658 }
2659 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2660 // Parse Exceptions attribute
2661 if (parsed_checked_exceptions_attribute) {
2662 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2663 CHECK_NULL);
2664 }
2665 parsed_checked_exceptions_attribute = true;
2666 checked_exceptions_start =
2667 parse_checked_exceptions(cfs,
2668 &checked_exceptions_length,
2669 method_attribute_length,
2670 CHECK_NULL);
2671 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2672 // reject multiple method parameters
2673 if (method_parameters_seen) {
2674 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2675 CHECK_NULL);
2676 }
2677 method_parameters_seen = true;
2678 method_parameters_length = cfs->get_u1_fast();
2679 const u2 real_length = (method_parameters_length * 4u) + 1u;
2680 if (method_attribute_length != real_length) {
2681 classfile_parse_error(
2682 "Invalid MethodParameters method attribute length %u in class file",
2683 method_attribute_length, CHECK_NULL);
2684 }
2685 method_parameters_data = cfs->current();
2686 cfs->skip_u2_fast(method_parameters_length);
2687 cfs->skip_u2_fast(method_parameters_length);
2688 // ignore this attribute if it cannot be reflected
2689 if (!SystemDictionary::Parameter_klass_loaded())
2690 method_parameters_length = -1;
2691 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2692 if (method_attribute_length != 0) {
2693 classfile_parse_error(
2694 "Invalid Synthetic method attribute length %u in class file %s",
2695 method_attribute_length, CHECK_NULL);
2696 }
2697 // Should we check that there hasn't already been a synthetic attribute?
2698 access_flags.set_is_synthetic();
2699 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2700 if (method_attribute_length != 0) {
2701 classfile_parse_error(
2702 "Invalid Deprecated method attribute length %u in class file %s",
2703 method_attribute_length, CHECK_NULL);
2704 }
2705 } else if (_major_version >= JAVA_1_5_VERSION) {
2706 if (method_attribute_name == vmSymbols::tag_signature()) {
2707 if (generic_signature_index != 0) {
2708 classfile_parse_error(
2709 "Multiple Signature attributes for method in class file %s",
2710 CHECK_NULL);
2711 }
2712 if (method_attribute_length != 2) {
2713 classfile_parse_error(
2714 "Invalid Signature attribute length %u in class file %s",
2715 method_attribute_length, CHECK_NULL);
2716 }
2717 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2718 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2719 if (runtime_visible_annotations != NULL) {
2720 classfile_parse_error(
2721 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2722 CHECK_NULL);
2723 }
2724 runtime_visible_annotations_length = method_attribute_length;
2725 runtime_visible_annotations = cfs->current();
2726 assert(runtime_visible_annotations != NULL, "null visible annotations");
2727 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2728 parse_annotations(cp,
2729 runtime_visible_annotations,
2730 runtime_visible_annotations_length,
2731 &parsed_annotations,
2732 _loader_data,
2733 CHECK_NULL);
2734 cfs->skip_u1_fast(runtime_visible_annotations_length);
2735 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2736 if (runtime_invisible_annotations_exists) {
2737 classfile_parse_error(
2738 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2739 CHECK_NULL);
2740 }
2741 runtime_invisible_annotations_exists = true;
2742 if (PreserveAllAnnotations) {
2743 runtime_invisible_annotations_length = method_attribute_length;
2744 runtime_invisible_annotations = cfs->current();
2745 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2746 }
2747 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2748 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2749 if (runtime_visible_parameter_annotations != NULL) {
2750 classfile_parse_error(
2751 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2752 CHECK_NULL);
2753 }
2754 runtime_visible_parameter_annotations_length = method_attribute_length;
2755 runtime_visible_parameter_annotations = cfs->current();
2756 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2757 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2758 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2759 if (runtime_invisible_parameter_annotations_exists) {
2760 classfile_parse_error(
2761 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2762 CHECK_NULL);
2763 }
2764 runtime_invisible_parameter_annotations_exists = true;
2765 if (PreserveAllAnnotations) {
2766 runtime_invisible_parameter_annotations_length = method_attribute_length;
2767 runtime_invisible_parameter_annotations = cfs->current();
2768 assert(runtime_invisible_parameter_annotations != NULL,
2769 "null invisible parameter annotations");
2770 }
2771 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2772 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2773 if (annotation_default != NULL) {
2774 classfile_parse_error(
2775 "Multiple AnnotationDefault attributes for method in class file %s",
2776 CHECK_NULL);
2777 }
2778 annotation_default_length = method_attribute_length;
2779 annotation_default = cfs->current();
2780 assert(annotation_default != NULL, "null annotation default");
2781 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2782 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2783 if (runtime_visible_type_annotations != NULL) {
2784 classfile_parse_error(
2785 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2786 CHECK_NULL);
2787 }
2788 runtime_visible_type_annotations_length = method_attribute_length;
2789 runtime_visible_type_annotations = cfs->current();
2790 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2791 // No need for the VM to parse Type annotations
2792 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2793 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2794 if (runtime_invisible_type_annotations_exists) {
2795 classfile_parse_error(
2796 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2797 CHECK_NULL);
2798 } else {
2799 runtime_invisible_type_annotations_exists = true;
2800 }
2801 if (PreserveAllAnnotations) {
2802 runtime_invisible_type_annotations_length = method_attribute_length;
2803 runtime_invisible_type_annotations = cfs->current();
2804 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2805 }
2806 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2807 } else {
2808 // Skip unknown attributes
2809 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2810 }
2811 } else {
2812 // Skip unknown attributes
2813 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2814 }
2815 }
2816
2817 if (linenumber_table != NULL) {
2818 linenumber_table->write_terminator();
2819 linenumber_table_length = linenumber_table->position();
2820 }
2821
2822 // Make sure there's at least one Code attribute in non-native/non-abstract method
2823 if (_need_verify) {
2824 guarantee_property(access_flags.is_native() ||
2825 access_flags.is_abstract() ||
2826 parsed_code_attribute,
2827 "Absent Code attribute in method that is not native or abstract in class file %s",
2828 CHECK_NULL);
2829 }
2830
2831 // All sizing information for a Method* is finally available, now create it
2832 InlineTableSizes sizes(
2833 total_lvt_length,
2834 linenumber_table_length,
2835 exception_table_length,
2836 checked_exceptions_length,
2837 method_parameters_length,
2838 generic_signature_index,
2839 runtime_visible_annotations_length +
2840 runtime_invisible_annotations_length,
2841 runtime_visible_parameter_annotations_length +
2842 runtime_invisible_parameter_annotations_length,
2843 runtime_visible_type_annotations_length +
2844 runtime_invisible_type_annotations_length,
2845 annotation_default_length,
2846 0);
2847
2848 Method* const m = Method::allocate(_loader_data,
2849 code_length,
2850 access_flags,
2851 &sizes,
2852 ConstMethod::NORMAL,
2853 CHECK_NULL);
2854
2855 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2856
2857 // Fill in information from fixed part (access_flags already set)
2858 m->set_constants(_cp);
2859 m->set_name_index(name_index);
2860 m->set_signature_index(signature_index);
2861
2862 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2863 m->constMethod()->set_result_type(rtf.type());
2864
2865 if (args_size >= 0) {
2866 m->set_size_of_parameters(args_size);
2867 } else {
2868 m->compute_size_of_parameters(THREAD);
2869 }
2870 #ifdef ASSERT
2871 if (args_size >= 0) {
2872 m->compute_size_of_parameters(THREAD);
2873 assert(args_size == m->size_of_parameters(), "");
2874 }
2875 #endif
2876
2877 // Fill in code attribute information
2878 m->set_max_stack(max_stack);
2879 m->set_max_locals(max_locals);
2880 if (stackmap_data != NULL) {
2881 m->constMethod()->copy_stackmap_data(_loader_data,
2882 (u1*)stackmap_data,
2883 stackmap_data_length,
2884 CHECK_NULL);
2885 }
2886
2887 // Copy byte codes
2888 m->set_code((u1*)code_start);
2889
2890 // Copy line number table
2891 if (linenumber_table != NULL) {
2892 memcpy(m->compressed_linenumber_table(),
2893 linenumber_table->buffer(),
2894 linenumber_table_length);
2895 }
2896
2897 // Copy exception table
2898 if (exception_table_length > 0) {
2899 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2900 m->exception_table_start(),
2901 exception_table_length * sizeof(ExceptionTableElement),
2902 sizeof(u2));
2903 }
2904
2905 // Copy method parameters
2906 if (method_parameters_length > 0) {
2907 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2908 for (int i = 0; i < method_parameters_length; i++) {
2909 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2910 method_parameters_data += 2;
2911 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2912 method_parameters_data += 2;
2913 }
2914 }
2915
2916 // Copy checked exceptions
2917 if (checked_exceptions_length > 0) {
2918 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2919 m->checked_exceptions_start(),
2920 checked_exceptions_length * sizeof(CheckedExceptionElement),
2921 sizeof(u2));
2922 }
2923
2924 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2925 if (total_lvt_length > 0) {
2926 promoted_flags->set_has_localvariable_table();
2927 copy_localvariable_table(m->constMethod(),
2928 lvt_cnt,
2929 localvariable_table_length,
2930 localvariable_table_start,
2931 lvtt_cnt,
2932 localvariable_type_table_length,
2933 localvariable_type_table_start,
2934 CHECK_NULL);
2935 }
2936
2937 if (parsed_annotations.has_any_annotations())
2938 parsed_annotations.apply_to(m);
2939
2940 // Copy annotations
2941 copy_method_annotations(m->constMethod(),
2942 runtime_visible_annotations,
2943 runtime_visible_annotations_length,
2944 runtime_invisible_annotations,
2945 runtime_invisible_annotations_length,
2946 runtime_visible_parameter_annotations,
2947 runtime_visible_parameter_annotations_length,
2948 runtime_invisible_parameter_annotations,
2949 runtime_invisible_parameter_annotations_length,
2950 runtime_visible_type_annotations,
2951 runtime_visible_type_annotations_length,
2952 runtime_invisible_type_annotations,
2953 runtime_invisible_type_annotations_length,
2954 annotation_default,
2955 annotation_default_length,
2956 CHECK_NULL);
2957
2958 if (name == vmSymbols::finalize_method_name() &&
2959 signature == vmSymbols::void_method_signature()) {
2960 if (m->is_empty_method()) {
2961 _has_empty_finalizer = true;
2962 } else {
2963 _has_finalizer = true;
2964 }
2965 }
2966 if (name == vmSymbols::object_initializer_name() &&
2967 signature == vmSymbols::void_method_signature() &&
2968 m->is_vanilla_constructor()) {
2969 _has_vanilla_constructor = true;
2970 }
2971
2972 NOT_PRODUCT(m->verify());
2973 return m;
2974 }
2975
2976
2977 // The promoted_flags parameter is used to pass relevant access_flags
2978 // from the methods back up to the containing klass. These flag values
2979 // are added to klass's access_flags.
2980 // Side-effects: populates the _methods field in the parser
2981 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2982 bool is_interface,
2983 bool is_value_type,
2984 AccessFlags* promoted_flags,
2985 bool* has_final_method,
2986 bool* declares_nonstatic_concrete_methods,
2987 TRAPS) {
2988 assert(cfs != NULL, "invariant");
2989 assert(promoted_flags != NULL, "invariant");
2990 assert(has_final_method != NULL, "invariant");
2991 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2992
2993 assert(NULL == _methods, "invariant");
2994
2995 cfs->guarantee_more(2, CHECK); // length
2996 const u2 length = cfs->get_u2_fast();
2997 if (length == 0) {
2998 _methods = Universe::the_empty_method_array();
2999 } else {
3000 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3001 length,
3002 NULL,
3003 CHECK);
3004
3005 for (int index = 0; index < length; index++) {
3006 Method* method = parse_method(cfs,
3007 is_interface,
3008 is_value_type,
3009 _cp,
3010 promoted_flags,
3011 CHECK);
3012
3013 if (method->is_final()) {
3014 *has_final_method = true;
3015 }
3016 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3017 // used for interface initialization, and default method inheritance analysis
3018 if (is_interface && !(*declares_nonstatic_concrete_methods)
3019 && !method->is_abstract() && !method->is_static()) {
3020 *declares_nonstatic_concrete_methods = true;
3021 }
3022 _methods->at_put(index, method);
3023 }
3024
3025 if (_need_verify && length > 1) {
3026 // Check duplicated methods
3027 ResourceMark rm(THREAD);
3028 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3029 THREAD, NameSigHash*, HASH_ROW_SIZE);
3030 initialize_hashtable(names_and_sigs);
3031 bool dup = false;
3032 const Symbol* name = NULL;
3033 const Symbol* sig = NULL;
3034 {
3035 debug_only(NoSafepointVerifier nsv;)
3036 for (int i = 0; i < length; i++) {
3037 const Method* const m = _methods->at(i);
3038 name = m->name();
3039 sig = m->signature();
3040 // If no duplicates, add name/signature in hashtable names_and_sigs.
3041 if (!put_after_lookup(name, sig, names_and_sigs)) {
3042 dup = true;
3043 break;
3044 }
3045 }
3046 }
3047 if (dup) {
3048 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3049 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3050 }
3051 }
3052 }
3053 }
3054
3055 static const intArray* sort_methods(Array<Method*>* methods) {
3056 const int length = methods->length();
3057 // If JVMTI original method ordering or sharing is enabled we have to
3058 // remember the original class file ordering.
3059 // We temporarily use the vtable_index field in the Method* to store the
3060 // class file index, so we can read in after calling qsort.
3061 // Put the method ordering in the shared archive.
3062 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3063 for (int index = 0; index < length; index++) {
3064 Method* const m = methods->at(index);
3065 assert(!m->valid_vtable_index(), "vtable index should not be set");
3066 m->set_vtable_index(index);
3067 }
3068 }
3069 // Sort method array by ascending method name (for faster lookups & vtable construction)
3070 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3071 Method::sort_methods(methods);
3072
3073 intArray* method_ordering = NULL;
3074 // If JVMTI original method ordering or sharing is enabled construct int
3075 // array remembering the original ordering
3076 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3077 method_ordering = new intArray(length, length, -1);
3078 for (int index = 0; index < length; index++) {
3079 Method* const m = methods->at(index);
3080 const int old_index = m->vtable_index();
3081 assert(old_index >= 0 && old_index < length, "invalid method index");
3082 method_ordering->at_put(index, old_index);
3083 m->set_vtable_index(Method::invalid_vtable_index);
3084 }
3085 }
3086 return method_ordering;
3087 }
3088
3089 // Parse generic_signature attribute for methods and fields
3090 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3091 TRAPS) {
3092 assert(cfs != NULL, "invariant");
3093
3094 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3095 const u2 generic_signature_index = cfs->get_u2_fast();
3096 check_property(
3097 valid_symbol_at(generic_signature_index),
3098 "Invalid Signature attribute at constant pool index %u in class file %s",
3099 generic_signature_index, CHECK_0);
3100 return generic_signature_index;
3101 }
3102
3103 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3104 TRAPS) {
3105
3106 assert(cfs != NULL, "invariant");
3107
3108 cfs->guarantee_more(2, CHECK); // sourcefile_index
3109 const u2 sourcefile_index = cfs->get_u2_fast();
3110 check_property(
3111 valid_symbol_at(sourcefile_index),
3112 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3113 sourcefile_index, CHECK);
3114 set_class_sourcefile_index(sourcefile_index);
3115 }
3116
3117 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3118 int length,
3119 TRAPS) {
3120 assert(cfs != NULL, "invariant");
3121
3122 const u1* const sde_buffer = cfs->current();
3123 assert(sde_buffer != NULL, "null sde buffer");
3124
3125 // Don't bother storing it if there is no way to retrieve it
3126 if (JvmtiExport::can_get_source_debug_extension()) {
3127 assert((length+1) > length, "Overflow checking");
3128 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3129 for (int i = 0; i < length; i++) {
3130 sde[i] = sde_buffer[i];
3131 }
3132 sde[length] = '\0';
3133 set_class_sde_buffer((const char*)sde, length);
3134 }
3135 // Got utf8 string, set stream position forward
3136 cfs->skip_u1(length, CHECK);
3137 }
3138
3139
3140 // Inner classes can be static, private or protected (classic VM does this)
3141 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3142 JVM_ACC_PRIVATE | \
3143 JVM_ACC_PROTECTED | \
3144 JVM_ACC_STATIC \
3145 )
3146
3147 // Return number of classes in the inner classes attribute table
3148 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3149 const u1* const inner_classes_attribute_start,
3150 bool parsed_enclosingmethod_attribute,
3151 u2 enclosing_method_class_index,
3152 u2 enclosing_method_method_index,
3153 TRAPS) {
3154 const u1* const current_mark = cfs->current();
3155 u2 length = 0;
3156 if (inner_classes_attribute_start != NULL) {
3157 cfs->set_current(inner_classes_attribute_start);
3158 cfs->guarantee_more(2, CHECK_0); // length
3159 length = cfs->get_u2_fast();
3160 }
3161
3162 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3163 // method data:
3164 // [inner_class_info_index,
3165 // outer_class_info_index,
3166 // inner_name_index,
3167 // inner_class_access_flags,
3168 // ...
3169 // enclosing_method_class_index,
3170 // enclosing_method_method_index]
3171 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3172 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3173 _inner_classes = inner_classes;
3174
3175 int index = 0;
3176 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3177 for (int n = 0; n < length; n++) {
3178 // Inner class index
3179 const u2 inner_class_info_index = cfs->get_u2_fast();
3180 check_property(
3181 valid_klass_reference_at(inner_class_info_index),
3182 "inner_class_info_index %u has bad constant type in class file %s",
3183 inner_class_info_index, CHECK_0);
3184 // Outer class index
3185 const u2 outer_class_info_index = cfs->get_u2_fast();
3186 check_property(
3187 outer_class_info_index == 0 ||
3188 valid_klass_reference_at(outer_class_info_index),
3189 "outer_class_info_index %u has bad constant type in class file %s",
3190 outer_class_info_index, CHECK_0);
3191 // Inner class name
3192 const u2 inner_name_index = cfs->get_u2_fast();
3193 check_property(
3194 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3195 "inner_name_index %u has bad constant type in class file %s",
3196 inner_name_index, CHECK_0);
3197 if (_need_verify) {
3198 guarantee_property(inner_class_info_index != outer_class_info_index,
3199 "Class is both outer and inner class in class file %s", CHECK_0);
3200 }
3201
3202 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3203 // JVM_ACC_MODULE is defined in JDK-9 and later.
3204 if (_major_version >= JAVA_9_VERSION) {
3205 recognized_modifiers |= JVM_ACC_MODULE;
3206 }
3207 // JVM_ACC_VALUE is defined for class file version 55 and later
3208 if (supports_value_types()) {
3209 recognized_modifiers |= JVM_ACC_VALUE;
3210 }
3211
3212 // Access flags
3213 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3214
3215 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3216 // Set abstract bit for old class files for backward compatibility
3217 flags |= JVM_ACC_ABSTRACT;
3218 }
3219 verify_legal_class_modifiers(flags, CHECK_0);
3220 AccessFlags inner_access_flags(flags);
3221
3222 inner_classes->at_put(index++, inner_class_info_index);
3223 inner_classes->at_put(index++, outer_class_info_index);
3224 inner_classes->at_put(index++, inner_name_index);
3225 inner_classes->at_put(index++, inner_access_flags.as_short());
3226 }
3227
3228 // 4347400: make sure there's no duplicate entry in the classes array
3229 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3230 for(int i = 0; i < length * 4; i += 4) {
3231 for(int j = i + 4; j < length * 4; j += 4) {
3232 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3233 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3234 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3235 inner_classes->at(i+3) != inner_classes->at(j+3)),
3236 "Duplicate entry in InnerClasses in class file %s",
3237 CHECK_0);
3238 }
3239 }
3240 }
3241
3242 // Set EnclosingMethod class and method indexes.
3243 if (parsed_enclosingmethod_attribute) {
3244 inner_classes->at_put(index++, enclosing_method_class_index);
3245 inner_classes->at_put(index++, enclosing_method_method_index);
3246 }
3247 assert(index == size, "wrong size");
3248
3249 // Restore buffer's current position.
3250 cfs->set_current(current_mark);
3251
3252 return length;
3253 }
3254
3255 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3256 const u1* const nest_members_attribute_start,
3257 TRAPS) {
3258 const u1* const current_mark = cfs->current();
3259 u2 length = 0;
3260 if (nest_members_attribute_start != NULL) {
3261 cfs->set_current(nest_members_attribute_start);
3262 cfs->guarantee_more(2, CHECK_0); // length
3263 length = cfs->get_u2_fast();
3264 }
3265 const int size = length;
3266 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3267 _nest_members = nest_members;
3268
3269 int index = 0;
3270 cfs->guarantee_more(2 * length, CHECK_0);
3271 for (int n = 0; n < length; n++) {
3272 const u2 class_info_index = cfs->get_u2_fast();
3273 check_property(
3274 valid_klass_reference_at(class_info_index),
3275 "Nest member class_info_index %u has bad constant type in class file %s",
3276 class_info_index, CHECK_0);
3277 nest_members->at_put(index++, class_info_index);
3278 }
3279 assert(index == size, "wrong size");
3280
3281 // Restore buffer's current position.
3282 cfs->set_current(current_mark);
3283
3284 return length;
3285 }
3286
3287 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3288 set_class_synthetic_flag(true);
3289 }
3290
3291 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3292 assert(cfs != NULL, "invariant");
3293
3294 const u2 signature_index = cfs->get_u2(CHECK);
3295 check_property(
3296 valid_symbol_at(signature_index),
3297 "Invalid constant pool index %u in Signature attribute in class file %s",
3298 signature_index, CHECK);
3299 set_class_generic_signature_index(signature_index);
3300 }
3301
3302 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3303 ConstantPool* cp,
3304 u4 attribute_byte_length,
3305 TRAPS) {
3306 assert(cfs != NULL, "invariant");
3307 assert(cp != NULL, "invariant");
3308
3309 const u1* const current_start = cfs->current();
3310
3311 guarantee_property(attribute_byte_length >= sizeof(u2),
3312 "Invalid BootstrapMethods attribute length %u in class file %s",
3313 attribute_byte_length,
3314 CHECK);
3315
3316 cfs->guarantee_more(attribute_byte_length, CHECK);
3317
3318 const int attribute_array_length = cfs->get_u2_fast();
3319
3320 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3321 "Short length on BootstrapMethods in class file %s",
3322 CHECK);
3323
3324
3325 // The attribute contains a counted array of counted tuples of shorts,
3326 // represending bootstrap specifiers:
3327 // length*{bootstrap_method_index, argument_count*{argument_index}}
3328 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3329 // operand_count = number of shorts in attr, except for leading length
3330
3331 // The attribute is copied into a short[] array.
3332 // The array begins with a series of short[2] pairs, one for each tuple.
3333 const int index_size = (attribute_array_length * 2);
3334
3335 Array<u2>* const operands =
3336 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3337
3338 // Eagerly assign operands so they will be deallocated with the constant
3339 // pool if there is an error.
3340 cp->set_operands(operands);
3341
3342 int operand_fill_index = index_size;
3343 const int cp_size = cp->length();
3344
3345 for (int n = 0; n < attribute_array_length; n++) {
3346 // Store a 32-bit offset into the header of the operand array.
3347 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3348
3349 // Read a bootstrap specifier.
3350 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3351 const u2 bootstrap_method_index = cfs->get_u2_fast();
3352 const u2 argument_count = cfs->get_u2_fast();
3353 check_property(
3354 valid_cp_range(bootstrap_method_index, cp_size) &&
3355 cp->tag_at(bootstrap_method_index).is_method_handle(),
3356 "bootstrap_method_index %u has bad constant type in class file %s",
3357 bootstrap_method_index,
3358 CHECK);
3359
3360 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3361 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3362 CHECK);
3363
3364 operands->at_put(operand_fill_index++, bootstrap_method_index);
3365 operands->at_put(operand_fill_index++, argument_count);
3366
3367 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3368 for (int j = 0; j < argument_count; j++) {
3369 const u2 argument_index = cfs->get_u2_fast();
3370 check_property(
3371 valid_cp_range(argument_index, cp_size) &&
3372 cp->tag_at(argument_index).is_loadable_constant(),
3373 "argument_index %u has bad constant type in class file %s",
3374 argument_index,
3375 CHECK);
3376 operands->at_put(operand_fill_index++, argument_index);
3377 }
3378 }
3379 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3380 "Bad length on BootstrapMethods in class file %s",
3381 CHECK);
3382 }
3383
3384 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3385 ConstantPool* cp,
3386 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3387 TRAPS) {
3388 assert(cfs != NULL, "invariant");
3389 assert(cp != NULL, "invariant");
3390 assert(parsed_annotations != NULL, "invariant");
3391
3392 // Set inner classes attribute to default sentinel
3393 _inner_classes = Universe::the_empty_short_array();
3394 // Set nest members attribute to default sentinel
3395 _nest_members = Universe::the_empty_short_array();
3396 cfs->guarantee_more(2, CHECK); // attributes_count
3397 u2 attributes_count = cfs->get_u2_fast();
3398 bool parsed_sourcefile_attribute = false;
3399 bool parsed_innerclasses_attribute = false;
3400 bool parsed_nest_members_attribute = false;
3401 bool parsed_nest_host_attribute = false;
3402 bool parsed_enclosingmethod_attribute = false;
3403 bool parsed_bootstrap_methods_attribute = false;
3404 const u1* runtime_visible_annotations = NULL;
3405 int runtime_visible_annotations_length = 0;
3406 const u1* runtime_invisible_annotations = NULL;
3407 int runtime_invisible_annotations_length = 0;
3408 const u1* runtime_visible_type_annotations = NULL;
3409 int runtime_visible_type_annotations_length = 0;
3410 const u1* runtime_invisible_type_annotations = NULL;
3411 int runtime_invisible_type_annotations_length = 0;
3412 bool runtime_invisible_type_annotations_exists = false;
3413 bool runtime_invisible_annotations_exists = false;
3414 bool parsed_source_debug_ext_annotations_exist = false;
3415 const u1* inner_classes_attribute_start = NULL;
3416 u4 inner_classes_attribute_length = 0;
3417 const u1* value_types_attribute_start = NULL;
3418 u4 value_types_attribute_length = 0;
3419 u2 enclosing_method_class_index = 0;
3420 u2 enclosing_method_method_index = 0;
3421 const u1* nest_members_attribute_start = NULL;
3422 u4 nest_members_attribute_length = 0;
3423
3424 // Iterate over attributes
3425 while (attributes_count--) {
3426 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3427 const u2 attribute_name_index = cfs->get_u2_fast();
3428 const u4 attribute_length = cfs->get_u4_fast();
3429 check_property(
3430 valid_symbol_at(attribute_name_index),
3431 "Attribute name has bad constant pool index %u in class file %s",
3432 attribute_name_index, CHECK);
3433 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3434 if (tag == vmSymbols::tag_source_file()) {
3435 // Check for SourceFile tag
3436 if (_need_verify) {
3437 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3438 }
3439 if (parsed_sourcefile_attribute) {
3440 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3441 } else {
3442 parsed_sourcefile_attribute = true;
3443 }
3444 parse_classfile_sourcefile_attribute(cfs, CHECK);
3445 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3446 // Check for SourceDebugExtension tag
3447 if (parsed_source_debug_ext_annotations_exist) {
3448 classfile_parse_error(
3449 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3450 }
3451 parsed_source_debug_ext_annotations_exist = true;
3452 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3453 } else if (tag == vmSymbols::tag_inner_classes()) {
3454 // Check for InnerClasses tag
3455 if (parsed_innerclasses_attribute) {
3456 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3457 } else {
3458 parsed_innerclasses_attribute = true;
3459 }
3460 inner_classes_attribute_start = cfs->current();
3461 inner_classes_attribute_length = attribute_length;
3462 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3463 } else if (tag == vmSymbols::tag_synthetic()) {
3464 // Check for Synthetic tag
3465 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3466 if (attribute_length != 0) {
3467 classfile_parse_error(
3468 "Invalid Synthetic classfile attribute length %u in class file %s",
3469 attribute_length, CHECK);
3470 }
3471 parse_classfile_synthetic_attribute(CHECK);
3472 } else if (tag == vmSymbols::tag_deprecated()) {
3473 // Check for Deprecatd tag - 4276120
3474 if (attribute_length != 0) {
3475 classfile_parse_error(
3476 "Invalid Deprecated classfile attribute length %u in class file %s",
3477 attribute_length, CHECK);
3478 }
3479 } else if (_major_version >= JAVA_1_5_VERSION) {
3480 if (tag == vmSymbols::tag_signature()) {
3481 if (_generic_signature_index != 0) {
3482 classfile_parse_error(
3483 "Multiple Signature attributes in class file %s", CHECK);
3484 }
3485 if (attribute_length != 2) {
3486 classfile_parse_error(
3487 "Wrong Signature attribute length %u in class file %s",
3488 attribute_length, CHECK);
3489 }
3490 parse_classfile_signature_attribute(cfs, CHECK);
3491 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3492 if (runtime_visible_annotations != NULL) {
3493 classfile_parse_error(
3494 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3495 }
3496 runtime_visible_annotations_length = attribute_length;
3497 runtime_visible_annotations = cfs->current();
3498 assert(runtime_visible_annotations != NULL, "null visible annotations");
3499 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3500 parse_annotations(cp,
3501 runtime_visible_annotations,
3502 runtime_visible_annotations_length,
3503 parsed_annotations,
3504 _loader_data,
3505 CHECK);
3506 cfs->skip_u1_fast(runtime_visible_annotations_length);
3507 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3508 if (runtime_invisible_annotations_exists) {
3509 classfile_parse_error(
3510 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3511 }
3512 runtime_invisible_annotations_exists = true;
3513 if (PreserveAllAnnotations) {
3514 runtime_invisible_annotations_length = attribute_length;
3515 runtime_invisible_annotations = cfs->current();
3516 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3517 }
3518 cfs->skip_u1(attribute_length, CHECK);
3519 } else if (tag == vmSymbols::tag_enclosing_method()) {
3520 if (parsed_enclosingmethod_attribute) {
3521 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3522 } else {
3523 parsed_enclosingmethod_attribute = true;
3524 }
3525 guarantee_property(attribute_length == 4,
3526 "Wrong EnclosingMethod attribute length %u in class file %s",
3527 attribute_length, CHECK);
3528 cfs->guarantee_more(4, CHECK); // class_index, method_index
3529 enclosing_method_class_index = cfs->get_u2_fast();
3530 enclosing_method_method_index = cfs->get_u2_fast();
3531 if (enclosing_method_class_index == 0) {
3532 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3533 }
3534 // Validate the constant pool indices and types
3535 check_property(valid_klass_reference_at(enclosing_method_class_index),
3536 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3537 if (enclosing_method_method_index != 0 &&
3538 (!cp->is_within_bounds(enclosing_method_method_index) ||
3539 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3540 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3541 }
3542 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3543 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3544 if (parsed_bootstrap_methods_attribute) {
3545 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3546 }
3547 parsed_bootstrap_methods_attribute = true;
3548 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3549 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3550 if (runtime_visible_type_annotations != NULL) {
3551 classfile_parse_error(
3552 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3553 }
3554 runtime_visible_type_annotations_length = attribute_length;
3555 runtime_visible_type_annotations = cfs->current();
3556 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3557 // No need for the VM to parse Type annotations
3558 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3559 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3560 if (runtime_invisible_type_annotations_exists) {
3561 classfile_parse_error(
3562 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3563 } else {
3564 runtime_invisible_type_annotations_exists = true;
3565 }
3566 if (PreserveAllAnnotations) {
3567 runtime_invisible_type_annotations_length = attribute_length;
3568 runtime_invisible_type_annotations = cfs->current();
3569 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3570 }
3571 cfs->skip_u1(attribute_length, CHECK);
3572 } else if (_major_version >= JAVA_11_VERSION) {
3573 if (tag == vmSymbols::tag_nest_members()) {
3574 // Check for NestMembers tag
3575 if (parsed_nest_members_attribute) {
3576 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3577 } else {
3578 parsed_nest_members_attribute = true;
3579 }
3580 if (parsed_nest_host_attribute) {
3581 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3582 }
3583 nest_members_attribute_start = cfs->current();
3584 nest_members_attribute_length = attribute_length;
3585 cfs->skip_u1(nest_members_attribute_length, CHECK);
3586 } else if (tag == vmSymbols::tag_nest_host()) {
3587 if (parsed_nest_host_attribute) {
3588 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3589 } else {
3590 parsed_nest_host_attribute = true;
3591 }
3592 if (parsed_nest_members_attribute) {
3593 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3594 }
3595 if (_need_verify) {
3596 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3597 }
3598 cfs->guarantee_more(2, CHECK);
3599 u2 class_info_index = cfs->get_u2_fast();
3600 check_property(
3601 valid_klass_reference_at(class_info_index),
3602 "Nest-host class_info_index %u has bad constant type in class file %s",
3603 class_info_index, CHECK);
3604 _nest_host = class_info_index;
3605 } else {
3606 // Unknown attribute
3607 cfs->skip_u1(attribute_length, CHECK);
3608 }
3609 } else {
3610 // Unknown attribute
3611 cfs->skip_u1(attribute_length, CHECK);
3612 }
3613 } else {
3614 // Unknown attribute
3615 cfs->skip_u1(attribute_length, CHECK);
3616 }
3617 }
3618 _annotations = assemble_annotations(runtime_visible_annotations,
3619 runtime_visible_annotations_length,
3620 runtime_invisible_annotations,
3621 runtime_invisible_annotations_length,
3622 CHECK);
3623 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3624 runtime_visible_type_annotations_length,
3625 runtime_invisible_type_annotations,
3626 runtime_invisible_type_annotations_length,
3627 CHECK);
3628
3629 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3630 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3631 cfs,
3632 inner_classes_attribute_start,
3633 parsed_innerclasses_attribute,
3634 enclosing_method_class_index,
3635 enclosing_method_method_index,
3636 CHECK);
3637 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3638 guarantee_property(
3639 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3640 "Wrong InnerClasses attribute length in class file %s", CHECK);
3641 }
3642 }
3643
3644 if (parsed_nest_members_attribute) {
3645 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3646 cfs,
3647 nest_members_attribute_start,
3648 CHECK);
3649 if (_need_verify) {
3650 guarantee_property(
3651 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3652 "Wrong NestMembers attribute length in class file %s", CHECK);
3653 }
3654 }
3655
3656 if (_max_bootstrap_specifier_index >= 0) {
3657 guarantee_property(parsed_bootstrap_methods_attribute,
3658 "Missing BootstrapMethods attribute in class file %s", CHECK);
3659 }
3660 }
3661
3662 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3663 assert(k != NULL, "invariant");
3664
3665 if (_synthetic_flag)
3666 k->set_is_synthetic();
3667 if (_sourcefile_index != 0) {
3668 k->set_source_file_name_index(_sourcefile_index);
3669 }
3670 if (_generic_signature_index != 0) {
3671 k->set_generic_signature_index(_generic_signature_index);
3672 }
3673 if (_sde_buffer != NULL) {
3674 k->set_source_debug_extension(_sde_buffer, _sde_length);
3675 }
3676 }
3677
3678 // Create the Annotations object that will
3679 // hold the annotations array for the Klass.
3680 void ClassFileParser::create_combined_annotations(TRAPS) {
3681 if (_annotations == NULL &&
3682 _type_annotations == NULL &&
3683 _fields_annotations == NULL &&
3684 _fields_type_annotations == NULL) {
3685 // Don't create the Annotations object unnecessarily.
3686 return;
3687 }
3688
3689 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3690 annotations->set_class_annotations(_annotations);
3691 annotations->set_class_type_annotations(_type_annotations);
3692 annotations->set_fields_annotations(_fields_annotations);
3693 annotations->set_fields_type_annotations(_fields_type_annotations);
3694
3695 // This is the Annotations object that will be
3696 // assigned to InstanceKlass being constructed.
3697 _combined_annotations = annotations;
3698
3699 // The annotations arrays below has been transfered the
3700 // _combined_annotations so these fields can now be cleared.
3701 _annotations = NULL;
3702 _type_annotations = NULL;
3703 _fields_annotations = NULL;
3704 _fields_type_annotations = NULL;
3705 }
3706
3707 // Transfer ownership of metadata allocated to the InstanceKlass.
3708 void ClassFileParser::apply_parsed_class_metadata(
3709 InstanceKlass* this_klass,
3710 int java_fields_count, TRAPS) {
3711 assert(this_klass != NULL, "invariant");
3712
3713 _cp->set_pool_holder(this_klass);
3714 this_klass->set_constants(_cp);
3715 this_klass->set_fields(_fields, java_fields_count);
3716 this_klass->set_methods(_methods);
3717 this_klass->set_inner_classes(_inner_classes);
3718 this_klass->set_nest_members(_nest_members);
3719 this_klass->set_nest_host_index(_nest_host);
3720 this_klass->set_local_interfaces(_local_interfaces);
3721 this_klass->set_annotations(_combined_annotations);
3722 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3723 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3724 // its _super. If an OOM occurs while loading the current klass, its _super field
3725 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3726 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3727 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3728
3729 // Clear out these fields so they don't get deallocated by the destructor
3730 clear_class_metadata();
3731 }
3732
3733 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3734 int runtime_visible_annotations_length,
3735 const u1* const runtime_invisible_annotations,
3736 int runtime_invisible_annotations_length,
3737 TRAPS) {
3738 AnnotationArray* annotations = NULL;
3739 if (runtime_visible_annotations != NULL ||
3740 runtime_invisible_annotations != NULL) {
3741 annotations = MetadataFactory::new_array<u1>(_loader_data,
3742 runtime_visible_annotations_length +
3743 runtime_invisible_annotations_length,
3744 CHECK_(annotations));
3745 if (runtime_visible_annotations != NULL) {
3746 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3747 annotations->at_put(i, runtime_visible_annotations[i]);
3748 }
3749 }
3750 if (runtime_invisible_annotations != NULL) {
3751 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3752 int append = runtime_visible_annotations_length+i;
3753 annotations->at_put(append, runtime_invisible_annotations[i]);
3754 }
3755 }
3756 }
3757 return annotations;
3758 }
3759
3760 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3761 const int super_class_index,
3762 const bool need_verify,
3763 TRAPS) {
3764 assert(cp != NULL, "invariant");
3765 const InstanceKlass* super_klass = NULL;
3766
3767 if (super_class_index == 0) {
3768 check_property(_class_name == vmSymbols::java_lang_Object()
3769 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3770 "Invalid superclass index %u in class file %s",
3771 super_class_index,
3772 CHECK_NULL);
3773 } else {
3774 check_property(valid_klass_reference_at(super_class_index),
3775 "Invalid superclass index %u in class file %s",
3776 super_class_index,
3777 CHECK_NULL);
3778 // The class name should be legal because it is checked when parsing constant pool.
3779 // However, make sure it is not an array type.
3780 bool is_array = false;
3781 if (cp->tag_at(super_class_index).is_klass()) {
3782 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3783 if (need_verify)
3784 is_array = super_klass->is_array_klass();
3785 } else if (need_verify) {
3786 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3787 }
3788 if (need_verify) {
3789 guarantee_property(!is_array,
3790 "Bad superclass name in class file %s", CHECK_NULL);
3791 }
3792 }
3793 return super_klass;
3794 }
3795
3796 #ifndef PRODUCT
3797 static void print_field_layout(const Symbol* name,
3798 Array<u2>* fields,
3799 const constantPoolHandle& cp,
3800 int instance_size,
3801 int instance_fields_start,
3802 int instance_fields_end,
3803 int static_fields_end) {
3804
3805 assert(name != NULL, "invariant");
3806
3807 tty->print("%s: field layout\n", name->as_klass_external_name());
3808 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3809 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3810 if (!fs.access_flags().is_static()) {
3811 tty->print(" @%3d \"%s\" %s\n",
3812 fs.offset(),
3813 fs.name()->as_klass_external_name(),
3814 fs.signature()->as_klass_external_name());
3815 }
3816 }
3817 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3818 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3819 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3820 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3821 if (fs.access_flags().is_static()) {
3822 tty->print(" @%3d \"%s\" %s\n",
3823 fs.offset(),
3824 fs.name()->as_klass_external_name(),
3825 fs.signature()->as_klass_external_name());
3826 }
3827 }
3828 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3829 tty->print("\n");
3830 }
3831 #endif
3832
3833 // Values needed for oopmap and InstanceKlass creation
3834 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3835 public:
3836 OopMapBlocksBuilder* oop_map_blocks;
3837 int instance_size;
3838 int nonstatic_field_size;
3839 int static_field_size;
3840 bool has_nonstatic_fields;
3841 };
3842
3843 // Utility to collect and compact oop maps during layout
3844 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3845 public:
3846 OopMapBlock* nonstatic_oop_maps;
3847 unsigned int nonstatic_oop_map_count;
3848 unsigned int max_nonstatic_oop_maps;
3849
3850 public:
3851 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3852 max_nonstatic_oop_maps = max_blocks;
3853 nonstatic_oop_map_count = 0;
3854 if (max_blocks == 0) {
3855 nonstatic_oop_maps = NULL;
3856 } else {
3857 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3858 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3859 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3860 }
3861 }
3862
3863 OopMapBlock* last_oop_map() const {
3864 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3865 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3866 }
3867
3868 // addition of super oop maps
3869 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3870 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3871 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3872
3873 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3874 nonstatic_oop_map_count += nof_blocks;
3875 }
3876
3877 // collection of oops
3878 void add(int offset, int count) {
3879 if (nonstatic_oop_map_count == 0) {
3880 nonstatic_oop_map_count++;
3881 }
3882 OopMapBlock* nonstatic_oop_map = last_oop_map();
3883 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3884 nonstatic_oop_map->set_offset(offset);
3885 nonstatic_oop_map->set_count(count);
3886 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3887 nonstatic_oop_map->increment_count(count);
3888 } else { // Need a new one...
3889 nonstatic_oop_map_count++;
3890 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3891 nonstatic_oop_map = last_oop_map();
3892 nonstatic_oop_map->set_offset(offset);
3893 nonstatic_oop_map->set_count(count);
3894 }
3895 }
3896
3897 // general purpose copy, e.g. into allocated instanceKlass
3898 void copy(OopMapBlock* dst) {
3899 if (nonstatic_oop_map_count != 0) {
3900 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3901 }
3902 }
3903
3904 // Sort and compact adjacent blocks
3905 void compact(TRAPS) {
3906 if (nonstatic_oop_map_count <= 1) {
3907 return;
3908 }
3909 /*
3910 * Since field layout sneeks in oops before values, we will be able to condense
3911 * blocks. There is potential to compact between super, own refs and values
3912 * containing refs.
3913 *
3914 * Currently compaction is slightly limited due to values being 8 byte aligned.
3915 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3916 * and maybe it doesn't need to be.
3917 */
3918 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3919 (_sort_Fn)OopMapBlock::compare_offset);
3920 if (nonstatic_oop_map_count < 2) {
3921 return;
3922 }
3923
3924 //Make a temp copy, and iterate through and copy back into the orig
3925 ResourceMark rm(THREAD);
3926 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3927 nonstatic_oop_map_count);
3928 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3929 copy(oop_maps_copy);
3930 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3931 unsigned int new_count = 1;
3932 oop_maps_copy++;
3933 while(oop_maps_copy < oop_maps_copy_end) {
3934 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3935 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3936 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3937 } else {
3938 nonstatic_oop_map++;
3939 new_count++;
3940 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3941 nonstatic_oop_map->set_count(oop_maps_copy->count());
3942 }
3943 oop_maps_copy++;
3944 }
3945 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3946 nonstatic_oop_map_count = new_count;
3947 }
3948
3949 void print_on(outputStream* st) const {
3950 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3951 if (nonstatic_oop_map_count > 0) {
3952 OopMapBlock* map = nonstatic_oop_maps;
3953 OopMapBlock* last_map = last_oop_map();
3954 assert(map <= last_map, "Last less than first");
3955 while (map <= last_map) {
3956 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3957 map->offset() + map->offset_span() - heapOopSize, map->count());
3958 map++;
3959 }
3960 }
3961 }
3962
3963 void print_value_on(outputStream* st) const {
3964 print_on(st);
3965 }
3966
3967 };
3968
3969 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3970 const char* msg,
3971 const Symbol* name,
3972 const Symbol* sig) const {
3973
3974 ResourceMark rm(THREAD);
3975 if (name == NULL || sig == NULL) {
3976 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3977 vmSymbols::java_lang_ClassFormatError(),
3978 "class: %s - %s", _class_name->as_C_string(), msg);
3979 }
3980 else {
3981 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3982 vmSymbols::java_lang_ClassFormatError(),
3983 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3984 _class_name->as_C_string(), msg);
3985 }
3986 }
3987
3988 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3989 void ClassFileParser::layout_fields(ConstantPool* cp,
3990 const FieldAllocationCount* fac,
3991 const ClassAnnotationCollector* parsed_annotations,
3992 FieldLayoutInfo* info,
3993 TRAPS) {
3994
3995 assert(cp != NULL, "invariant");
3996
3997 // Field size and offset computation
3998 int nonstatic_field_size = _super_klass == NULL ? 0 :
3999 _super_klass->nonstatic_field_size();
4000 int next_nonstatic_valuetype_offset = 0;
4001 int first_nonstatic_valuetype_offset = 0;
4002
4003 // Fields that are value types are handled differently depending if they are static or not:
4004 // - static fields are oops
4005 // - non-static fields are embedded
4006
4007 // Count the contended fields by type.
4008 //
4009 // We ignore static fields, because @Contended is not supported for them.
4010 // The layout code below will also ignore the static fields.
4011 int nonstatic_contended_count = 0;
4012 FieldAllocationCount fac_contended;
4013 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4014 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4015 if (fs.is_contended()) {
4016 fac_contended.count[atype]++;
4017 if (!fs.access_flags().is_static()) {
4018 nonstatic_contended_count++;
4019 }
4020 }
4021 }
4022
4023
4024 // Calculate the starting byte offsets
4025 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4026 // Value types in static fields are not embedded, they are handled with oops
4027 int next_static_double_offset = next_static_oop_offset +
4028 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4029 if (fac->count[STATIC_DOUBLE]) {
4030 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4031 }
4032
4033 int next_static_word_offset = next_static_double_offset +
4034 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4035 int next_static_short_offset = next_static_word_offset +
4036 ((fac->count[STATIC_WORD]) * BytesPerInt);
4037 int next_static_byte_offset = next_static_short_offset +
4038 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4039
4040 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4041 nonstatic_field_size * heapOopSize;
4042
4043 // First field of value types is aligned on a long boundary in order to ease
4044 // in-lining of value types (with header removal) in packed arrays and
4045 // flatten value types
4046 int initial_value_type_padding = 0;
4047 if (is_value_type()) {
4048 int old = nonstatic_fields_start;
4049 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4050 initial_value_type_padding = nonstatic_fields_start - old;
4051 }
4052
4053 int next_nonstatic_field_offset = nonstatic_fields_start;
4054
4055 const bool is_contended_class = parsed_annotations->is_contended();
4056
4057 // Class is contended, pad before all the fields
4058 if (is_contended_class) {
4059 next_nonstatic_field_offset += ContendedPaddingWidth;
4060 }
4061
4062 // Temporary value types restrictions
4063 if (is_value_type()) {
4064 if (is_contended_class) {
4065 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4066 return;
4067 }
4068 }
4069
4070 // Compute the non-contended fields count.
4071 // The packing code below relies on these counts to determine if some field
4072 // can be squeezed into the alignment gap. Contended fields are obviously
4073 // exempt from that.
4074 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4075 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4076 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4077 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4078 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4079
4080 int static_value_type_count = 0;
4081 int nonstatic_value_type_count = 0;
4082 int* nonstatic_value_type_indexes = NULL;
4083 Klass** nonstatic_value_type_klasses = NULL;
4084 unsigned int value_type_oop_map_count = 0;
4085 int not_flattened_value_types = 0;
4086
4087 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4088
4089 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4090 max_nonstatic_value_type);
4091 for (int i = 0; i < max_nonstatic_value_type; i++) {
4092 nonstatic_value_type_indexes[i] = -1;
4093 }
4094 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4095 max_nonstatic_value_type);
4096
4097 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4098 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4099 // Pre-resolve the flattenable field and check for value type circularity
4100 // issues. Note that super-class circularity checks are not needed here
4101 // because flattenable fields can only be in value types and value types
4102 // only have java.lang.Object as their super class.
4103 // Also, note that super-interface circularity checks are not needed
4104 // because interfaces cannot be value types.
4105 ResourceMark rm;
4106 if (!fs.signature()->is_Q_signature()) {
4107 THROW(vmSymbols::java_lang_ClassFormatError());
4108 }
4109 Klass* klass =
4110 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4111 Handle(THREAD, _loader_data->class_loader()),
4112 _protection_domain, true, CHECK);
4113 assert(klass != NULL, "Sanity check");
4114 if (!klass->access_flags().is_value_type()) {
4115 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4116 }
4117 static_value_type_count++;
4118 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4119 // Pre-resolve the flattenable field and check for value type circularity issues.
4120 ResourceMark rm;
4121 if (!fs.signature()->is_Q_signature()) {
4122 THROW(vmSymbols::java_lang_ClassFormatError());
4123 }
4124 Klass* klass =
4125 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4126 Handle(THREAD, _loader_data->class_loader()),
4127 _protection_domain, true, CHECK);
4128 assert(klass != NULL, "Sanity check");
4129 if (!klass->access_flags().is_value_type()) {
4130 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4131 }
4132 ValueKlass* vk = ValueKlass::cast(klass);
4133 // Conditions to apply flattening or not should be defined in a single place
4134 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4135 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4136 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4137 nonstatic_value_type_count++;
4138
4139 ValueKlass* vklass = ValueKlass::cast(klass);
4140 if (vklass->contains_oops()) {
4141 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4142 }
4143 fs.set_flattened(true);
4144 } else {
4145 not_flattened_value_types++;
4146 fs.set_flattened(false);
4147 }
4148 }
4149 }
4150
4151 // Adjusting non_static_oop_count to take into account not flattened value types;
4152 nonstatic_oop_count += not_flattened_value_types;
4153
4154 // Total non-static fields count, including every contended field
4155 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4156 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4157 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4158
4159 const bool super_has_nonstatic_fields =
4160 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4161 const bool has_nonstatic_fields =
4162 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4163 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4164
4165 if (is_value_type() && (!has_nonstatic_fields)) {
4166 // There are a number of fixes required throughout the type system and JIT
4167 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4168 return;
4169 }
4170
4171 // Prepare list of oops for oop map generation.
4172 //
4173 // "offset" and "count" lists are describing the set of contiguous oop
4174 // regions. offset[i] is the start of the i-th region, which then has
4175 // count[i] oops following. Before we know how many regions are required,
4176 // we pessimistically allocate the maps to fit all the oops into the
4177 // distinct regions.
4178 //
4179 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4180 int max_oop_map_count =
4181 super_oop_map_count +
4182 fac->count[NONSTATIC_OOP] +
4183 value_type_oop_map_count +
4184 not_flattened_value_types;
4185
4186 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4187 if (super_oop_map_count > 0) {
4188 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4189 _super_klass->nonstatic_oop_map_count());
4190 }
4191
4192 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4193
4194 bool compact_fields = CompactFields;
4195 int allocation_style = FieldsAllocationStyle;
4196 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4197 assert(false, "0 <= FieldsAllocationStyle <= 2");
4198 allocation_style = 1; // Optimistic
4199 }
4200
4201 // The next classes have predefined hard-coded fields offsets
4202 // (see in JavaClasses::compute_hard_coded_offsets()).
4203 // Use default fields allocation order for them.
4204 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4205 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4206 _class_name == vmSymbols::java_lang_Class() ||
4207 _class_name == vmSymbols::java_lang_ClassLoader() ||
4208 _class_name == vmSymbols::java_lang_ref_Reference() ||
4209 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4210 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4211 _class_name == vmSymbols::java_lang_String() ||
4212 _class_name == vmSymbols::java_lang_Throwable() ||
4213 _class_name == vmSymbols::java_lang_Boolean() ||
4214 _class_name == vmSymbols::java_lang_Character() ||
4215 _class_name == vmSymbols::java_lang_Float() ||
4216 _class_name == vmSymbols::java_lang_Double() ||
4217 _class_name == vmSymbols::java_lang_Byte() ||
4218 _class_name == vmSymbols::java_lang_Short() ||
4219 _class_name == vmSymbols::java_lang_Integer() ||
4220 _class_name == vmSymbols::java_lang_Long())) {
4221 allocation_style = 0; // Allocate oops first
4222 compact_fields = false; // Don't compact fields
4223 }
4224
4225 int next_nonstatic_oop_offset = 0;
4226 int next_nonstatic_double_offset = 0;
4227
4228 // Rearrange fields for a given allocation style
4229 if( allocation_style == 0 ) {
4230 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4231 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4232 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4233 (nonstatic_oop_count * heapOopSize);
4234 } else if( allocation_style == 1 ) {
4235 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4236 next_nonstatic_double_offset = next_nonstatic_field_offset;
4237 } else if( allocation_style == 2 ) {
4238 // Fields allocation: oops fields in super and sub classes are together.
4239 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4240 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4241 allocation_style = 0; // allocate oops first
4242 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4243 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4244 (nonstatic_oop_count * heapOopSize);
4245 }
4246 }
4247 if( allocation_style == 2 ) {
4248 allocation_style = 1; // allocate oops last
4249 next_nonstatic_double_offset = next_nonstatic_field_offset;
4250 }
4251 } else {
4252 ShouldNotReachHere();
4253 }
4254
4255 int nonstatic_oop_space_count = 0;
4256 int nonstatic_word_space_count = 0;
4257 int nonstatic_short_space_count = 0;
4258 int nonstatic_byte_space_count = 0;
4259 int nonstatic_oop_space_offset = 0;
4260 int nonstatic_word_space_offset = 0;
4261 int nonstatic_short_space_offset = 0;
4262 int nonstatic_byte_space_offset = 0;
4263
4264 // Try to squeeze some of the fields into the gaps due to
4265 // long/double alignment.
4266 if (nonstatic_double_count > 0) {
4267 int offset = next_nonstatic_double_offset;
4268 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4269 if (compact_fields && offset != next_nonstatic_double_offset) {
4270 // Allocate available fields into the gap before double field.
4271 int length = next_nonstatic_double_offset - offset;
4272 assert(length == BytesPerInt, "");
4273 nonstatic_word_space_offset = offset;
4274 if (nonstatic_word_count > 0) {
4275 nonstatic_word_count -= 1;
4276 nonstatic_word_space_count = 1; // Only one will fit
4277 length -= BytesPerInt;
4278 offset += BytesPerInt;
4279 }
4280 nonstatic_short_space_offset = offset;
4281 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4282 nonstatic_short_count -= 1;
4283 nonstatic_short_space_count += 1;
4284 length -= BytesPerShort;
4285 offset += BytesPerShort;
4286 }
4287 nonstatic_byte_space_offset = offset;
4288 while (length > 0 && nonstatic_byte_count > 0) {
4289 nonstatic_byte_count -= 1;
4290 nonstatic_byte_space_count += 1;
4291 length -= 1;
4292 }
4293 // Allocate oop field in the gap if there are no other fields for that.
4294 nonstatic_oop_space_offset = offset;
4295 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4296 allocation_style != 0) { // when oop fields not first
4297 nonstatic_oop_count -= 1;
4298 nonstatic_oop_space_count = 1; // Only one will fit
4299 length -= heapOopSize;
4300 offset += heapOopSize;
4301 }
4302 }
4303 }
4304
4305 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4306 (nonstatic_double_count * BytesPerLong);
4307 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4308 (nonstatic_word_count * BytesPerInt);
4309 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4310 (nonstatic_short_count * BytesPerShort);
4311 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4312 nonstatic_byte_count;
4313
4314 // let oops jump before padding with this allocation style
4315 if( allocation_style == 1 ) {
4316 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4317 if( nonstatic_oop_count > 0 ) {
4318 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4319 }
4320 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4321 }
4322
4323 // Aligning embedded value types
4324 // bug below, the current algorithm to layout embedded value types always put them at the
4325 // end of the layout, which doesn't match the different allocation policies the VM is
4326 // supposed to provide => FixMe
4327 // Note also that the current alignment policy is to make each value type starting on a
4328 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4329 // align value types according to their most constrained internal type.
4330 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4331 int next_value_type_index = 0;
4332
4333 // Iterate over fields again and compute correct offsets.
4334 // The field allocation type was temporarily stored in the offset slot.
4335 // oop fields are located before non-oop fields (static and non-static).
4336 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4337
4338 // skip already laid out fields
4339 if (fs.is_offset_set()) continue;
4340
4341 // contended instance fields are handled below
4342 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4343
4344 int real_offset = 0;
4345 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4346
4347 // pack the rest of the fields
4348 switch (atype) {
4349 // Value types in static fields are handled with oops
4350 case STATIC_FLATTENABLE: // Fallthrough
4351 case STATIC_OOP:
4352 real_offset = next_static_oop_offset;
4353 next_static_oop_offset += heapOopSize;
4354 break;
4355 case STATIC_BYTE:
4356 real_offset = next_static_byte_offset;
4357 next_static_byte_offset += 1;
4358 break;
4359 case STATIC_SHORT:
4360 real_offset = next_static_short_offset;
4361 next_static_short_offset += BytesPerShort;
4362 break;
4363 case STATIC_WORD:
4364 real_offset = next_static_word_offset;
4365 next_static_word_offset += BytesPerInt;
4366 break;
4367 case STATIC_DOUBLE:
4368 real_offset = next_static_double_offset;
4369 next_static_double_offset += BytesPerLong;
4370 break;
4371 case NONSTATIC_FLATTENABLE:
4372 if (fs.is_flattened()) {
4373 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4374 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4375 assert(klass->access_flags().is_value_type(),"Must be a value type");
4376 ValueKlass* vklass = ValueKlass::cast(klass);
4377 real_offset = next_nonstatic_valuetype_offset;
4378 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4379 // aligning next value type on a 64 bits boundary
4380 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4381 next_value_type_index += 1;
4382
4383 if (vklass->contains_oops()) { // add flatten oop maps
4384 int diff = real_offset - vklass->first_field_offset();
4385 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4386 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4387 while (map < last_map) {
4388 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4389 map++;
4390 }
4391 }
4392 break;
4393 } else {
4394 // Fall through
4395 }
4396 case NONSTATIC_OOP:
4397 if( nonstatic_oop_space_count > 0 ) {
4398 real_offset = nonstatic_oop_space_offset;
4399 nonstatic_oop_space_offset += heapOopSize;
4400 nonstatic_oop_space_count -= 1;
4401 } else {
4402 real_offset = next_nonstatic_oop_offset;
4403 next_nonstatic_oop_offset += heapOopSize;
4404 }
4405 nonstatic_oop_maps->add(real_offset, 1);
4406 break;
4407 case NONSTATIC_BYTE:
4408 if( nonstatic_byte_space_count > 0 ) {
4409 real_offset = nonstatic_byte_space_offset;
4410 nonstatic_byte_space_offset += 1;
4411 nonstatic_byte_space_count -= 1;
4412 } else {
4413 real_offset = next_nonstatic_byte_offset;
4414 next_nonstatic_byte_offset += 1;
4415 }
4416 break;
4417 case NONSTATIC_SHORT:
4418 if( nonstatic_short_space_count > 0 ) {
4419 real_offset = nonstatic_short_space_offset;
4420 nonstatic_short_space_offset += BytesPerShort;
4421 nonstatic_short_space_count -= 1;
4422 } else {
4423 real_offset = next_nonstatic_short_offset;
4424 next_nonstatic_short_offset += BytesPerShort;
4425 }
4426 break;
4427 case NONSTATIC_WORD:
4428 if( nonstatic_word_space_count > 0 ) {
4429 real_offset = nonstatic_word_space_offset;
4430 nonstatic_word_space_offset += BytesPerInt;
4431 nonstatic_word_space_count -= 1;
4432 } else {
4433 real_offset = next_nonstatic_word_offset;
4434 next_nonstatic_word_offset += BytesPerInt;
4435 }
4436 break;
4437 case NONSTATIC_DOUBLE:
4438 real_offset = next_nonstatic_double_offset;
4439 next_nonstatic_double_offset += BytesPerLong;
4440 break;
4441 default:
4442 ShouldNotReachHere();
4443 }
4444 fs.set_offset(real_offset);
4445 }
4446
4447
4448 // Handle the contended cases.
4449 //
4450 // Each contended field should not intersect the cache line with another contended field.
4451 // In the absence of alignment information, we end up with pessimistically separating
4452 // the fields with full-width padding.
4453 //
4454 // Additionally, this should not break alignment for the fields, so we round the alignment up
4455 // for each field.
4456 if (nonstatic_contended_count > 0) {
4457
4458 // if there is at least one contended field, we need to have pre-padding for them
4459 next_nonstatic_padded_offset += ContendedPaddingWidth;
4460
4461 // collect all contended groups
4462 ResourceBitMap bm(cp->size());
4463 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4464 // skip already laid out fields
4465 if (fs.is_offset_set()) continue;
4466
4467 if (fs.is_contended()) {
4468 bm.set_bit(fs.contended_group());
4469 }
4470 }
4471
4472 int current_group = -1;
4473 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4474
4475 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4476
4477 // skip already laid out fields
4478 if (fs.is_offset_set()) continue;
4479
4480 // skip non-contended fields and fields from different group
4481 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4482
4483 // handle statics below
4484 if (fs.access_flags().is_static()) continue;
4485
4486 int real_offset = 0;
4487 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4488
4489 switch (atype) {
4490 case NONSTATIC_BYTE:
4491 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4492 real_offset = next_nonstatic_padded_offset;
4493 next_nonstatic_padded_offset += 1;
4494 break;
4495
4496 case NONSTATIC_SHORT:
4497 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4498 real_offset = next_nonstatic_padded_offset;
4499 next_nonstatic_padded_offset += BytesPerShort;
4500 break;
4501
4502 case NONSTATIC_WORD:
4503 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4504 real_offset = next_nonstatic_padded_offset;
4505 next_nonstatic_padded_offset += BytesPerInt;
4506 break;
4507
4508 case NONSTATIC_DOUBLE:
4509 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4510 real_offset = next_nonstatic_padded_offset;
4511 next_nonstatic_padded_offset += BytesPerLong;
4512 break;
4513
4514 // Value types in static fields are handled with oops
4515 case NONSTATIC_FLATTENABLE:
4516 throwValueTypeLimitation(THREAD_AND_LOCATION,
4517 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4518 return;
4519
4520 case NONSTATIC_OOP:
4521 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4522 real_offset = next_nonstatic_padded_offset;
4523 next_nonstatic_padded_offset += heapOopSize;
4524 nonstatic_oop_maps->add(real_offset, 1);
4525 break;
4526
4527 default:
4528 ShouldNotReachHere();
4529 }
4530
4531 if (fs.contended_group() == 0) {
4532 // Contended group defines the equivalence class over the fields:
4533 // the fields within the same contended group are not inter-padded.
4534 // The only exception is default group, which does not incur the
4535 // equivalence, and so requires intra-padding.
4536 next_nonstatic_padded_offset += ContendedPaddingWidth;
4537 }
4538
4539 fs.set_offset(real_offset);
4540 } // for
4541
4542 // Start laying out the next group.
4543 // Note that this will effectively pad the last group in the back;
4544 // this is expected to alleviate memory contention effects for
4545 // subclass fields and/or adjacent object.
4546 // If this was the default group, the padding is already in place.
4547 if (current_group != 0) {
4548 next_nonstatic_padded_offset += ContendedPaddingWidth;
4549 }
4550 }
4551
4552 // handle static fields
4553 }
4554
4555 // Entire class is contended, pad in the back.
4556 // This helps to alleviate memory contention effects for subclass fields
4557 // and/or adjacent object.
4558 if (is_contended_class) {
4559 assert(!is_value_type(), "@Contended not supported for value types yet");
4560 next_nonstatic_padded_offset += ContendedPaddingWidth;
4561 }
4562
4563 int notaligned_nonstatic_fields_end;
4564 if (nonstatic_value_type_count != 0) {
4565 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4566 } else {
4567 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4568 }
4569
4570 int nonstatic_field_sz_align = heapOopSize;
4571 if (is_value_type()) {
4572 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4573 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4574 }
4575 }
4576 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4577 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4578 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4579
4580 int static_field_size = (static_fields_end -
4581 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4582 nonstatic_field_size = nonstatic_field_size +
4583 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4584
4585 int instance_size = align_object_size(instance_end / wordSize);
4586
4587 assert(instance_size == align_object_size(align_up(
4588 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4589 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4590
4591
4592 // Invariant: nonstatic_field end/start should only change if there are
4593 // nonstatic fields in the class, or if the class is contended. We compare
4594 // against the non-aligned value, so that end alignment will not fail the
4595 // assert without actually having the fields.
4596 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4597 is_contended_class ||
4598 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4599
4600 // Number of non-static oop map blocks allocated at end of klass.
4601 nonstatic_oop_maps->compact(THREAD);
4602
4603 #ifndef PRODUCT
4604 if ((PrintFieldLayout && !is_value_type()) ||
4605 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4606 print_field_layout(_class_name,
4607 _fields,
4608 cp,
4609 instance_size,
4610 nonstatic_fields_start,
4611 nonstatic_fields_end,
4612 static_fields_end);
4613 nonstatic_oop_maps->print_on(tty);
4614 tty->print("\n");
4615 }
4616
4617 #endif
4618 // Pass back information needed for InstanceKlass creation
4619 info->oop_map_blocks = nonstatic_oop_maps;
4620 info->instance_size = instance_size;
4621 info->static_field_size = static_field_size;
4622 info->nonstatic_field_size = nonstatic_field_size;
4623 info->has_nonstatic_fields = has_nonstatic_fields;
4624 }
4625
4626 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4627 assert(ik != NULL, "invariant");
4628
4629 const Klass* const super = ik->super();
4630
4631 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4632 // in which case we don't have to register objects as finalizable
4633 if (!_has_empty_finalizer) {
4634 if (_has_finalizer ||
4635 (super != NULL && super->has_finalizer())) {
4636 ik->set_has_finalizer();
4637 }
4638 }
4639
4640 #ifdef ASSERT
4641 bool f = false;
4642 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4643 vmSymbols::void_method_signature());
4644 if (m != NULL && !m->is_empty_method()) {
4645 f = true;
4646 }
4647
4648 // Spec doesn't prevent agent from redefinition of empty finalizer.
4649 // Despite the fact that it's generally bad idea and redefined finalizer
4650 // will not work as expected we shouldn't abort vm in this case
4651 if (!ik->has_redefined_this_or_super()) {
4652 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4653 }
4654 #endif
4655
4656 // Check if this klass supports the java.lang.Cloneable interface
4657 if (SystemDictionary::Cloneable_klass_loaded()) {
4658 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4659 if (ik->is_value()) {
4660 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4661 return;
4662 }
4663 ik->set_is_cloneable();
4664 }
4665 }
4666
4667 // Check if this klass has a vanilla default constructor
4668 if (super == NULL) {
4669 // java.lang.Object has empty default constructor
4670 ik->set_has_vanilla_constructor();
4671 } else {
4672 if (super->has_vanilla_constructor() &&
4673 _has_vanilla_constructor) {
4674 ik->set_has_vanilla_constructor();
4675 }
4676 #ifdef ASSERT
4677 bool v = false;
4678 if (super->has_vanilla_constructor()) {
4679 const Method* const constructor =
4680 ik->find_method(vmSymbols::object_initializer_name(),
4681 vmSymbols::void_method_signature());
4682 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4683 v = true;
4684 }
4685 }
4686 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4687 #endif
4688 }
4689
4690 // If it cannot be fast-path allocated, set a bit in the layout helper.
4691 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4692 assert(ik->size_helper() > 0, "layout_helper is initialized");
4693 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4694 || ik->is_abstract() || ik->is_interface()
4695 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4696 || ik->size_helper() >= FastAllocateSizeLimit) {
4697 // Forbid fast-path allocation.
4698 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4699 ik->set_layout_helper(lh);
4700 }
4701 }
4702
4703 bool ClassFileParser::supports_value_types() const {
4704 // Value types are only supported by class file version 55 and later
4705 return _major_version >= JAVA_11_VERSION;
4706 }
4707
4708 // utility methods for appending an array with check for duplicates
4709
4710 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4711 const Array<InstanceKlass*>* const ifs) {
4712 // iterate over new interfaces
4713 for (int i = 0; i < ifs->length(); i++) {
4714 InstanceKlass* const e = ifs->at(i);
4715 assert(e->is_klass() && e->is_interface(), "just checking");
4716 // add new interface
4717 result->append_if_missing(e);
4718 }
4719 }
4720
4721 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4722 Array<InstanceKlass*>* local_ifs,
4723 ClassLoaderData* loader_data,
4724 TRAPS) {
4725 assert(local_ifs != NULL, "invariant");
4726 assert(loader_data != NULL, "invariant");
4727
4728 // Compute maximum size for transitive interfaces
4729 int max_transitive_size = 0;
4730 int super_size = 0;
4731 // Add superclass transitive interfaces size
4732 if (super != NULL) {
4733 super_size = super->transitive_interfaces()->length();
4734 max_transitive_size += super_size;
4735 }
4736 // Add local interfaces' super interfaces
4737 const int local_size = local_ifs->length();
4738 for (int i = 0; i < local_size; i++) {
4739 InstanceKlass* const l = local_ifs->at(i);
4740 max_transitive_size += l->transitive_interfaces()->length();
4741 }
4742 // Finally add local interfaces
4743 max_transitive_size += local_size;
4744 // Construct array
4745 if (max_transitive_size == 0) {
4746 // no interfaces, use canonicalized array
4747 return Universe::the_empty_instance_klass_array();
4748 } else if (max_transitive_size == super_size) {
4749 // no new local interfaces added, share superklass' transitive interface array
4750 return super->transitive_interfaces();
4751 } else if (max_transitive_size == local_size) {
4752 // only local interfaces added, share local interface array
4753 return local_ifs;
4754 } else {
4755 ResourceMark rm;
4756 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4757
4758 // Copy down from superclass
4759 if (super != NULL) {
4760 append_interfaces(result, super->transitive_interfaces());
4761 }
4762
4763 // Copy down from local interfaces' superinterfaces
4764 for (int i = 0; i < local_size; i++) {
4765 InstanceKlass* const l = local_ifs->at(i);
4766 append_interfaces(result, l->transitive_interfaces());
4767 }
4768 // Finally add local interfaces
4769 append_interfaces(result, local_ifs);
4770
4771 // length will be less than the max_transitive_size if duplicates were removed
4772 const int length = result->length();
4773 assert(length <= max_transitive_size, "just checking");
4774 Array<InstanceKlass*>* const new_result =
4775 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4776 for (int i = 0; i < length; i++) {
4777 InstanceKlass* const e = result->at(i);
4778 assert(e != NULL, "just checking");
4779 new_result->at_put(i, e);
4780 }
4781 return new_result;
4782 }
4783 }
4784
4785 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4786 assert(this_klass != NULL, "invariant");
4787 const Klass* const super = this_klass->super();
4788 if (super != NULL) {
4789
4790 // If the loader is not the boot loader then throw an exception if its
4791 // superclass is in package jdk.internal.reflect and its loader is not a
4792 // special reflection class loader
4793 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4794 assert(super->is_instance_klass(), "super is not instance klass");
4795 PackageEntry* super_package = super->package();
4796 if (super_package != NULL &&
4797 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4798 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4799 ResourceMark rm(THREAD);
4800 Exceptions::fthrow(
4801 THREAD_AND_LOCATION,
4802 vmSymbols::java_lang_IllegalAccessError(),
4803 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4804 this_klass->external_name(),
4805 this_klass->class_loader_data()->loader_name_and_id(),
4806 super->external_name());
4807 return;
4808 }
4809 }
4810
4811 Reflection::VerifyClassAccessResults vca_result =
4812 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4813 if (vca_result != Reflection::ACCESS_OK) {
4814 ResourceMark rm(THREAD);
4815 char* msg = Reflection::verify_class_access_msg(this_klass,
4816 InstanceKlass::cast(super),
4817 vca_result);
4818 if (msg == NULL) {
4819 bool same_module = (this_klass->module() == super->module());
4820 Exceptions::fthrow(
4821 THREAD_AND_LOCATION,
4822 vmSymbols::java_lang_IllegalAccessError(),
4823 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4824 this_klass->external_name(),
4825 super->is_abstract() ? "abstract " : "",
4826 super->external_name(),
4827 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4828 (same_module) ? "" : "; ",
4829 (same_module) ? "" : super->class_in_module_of_loader());
4830 } else {
4831 // Add additional message content.
4832 Exceptions::fthrow(
4833 THREAD_AND_LOCATION,
4834 vmSymbols::java_lang_IllegalAccessError(),
4835 "superclass access check failed: %s",
4836 msg);
4837 }
4838 }
4839 }
4840 }
4841
4842
4843 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4844 assert(this_klass != NULL, "invariant");
4845 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4846 const int lng = local_interfaces->length();
4847 for (int i = lng - 1; i >= 0; i--) {
4848 InstanceKlass* const k = local_interfaces->at(i);
4849 assert (k != NULL && k->is_interface(), "invalid interface");
4850 Reflection::VerifyClassAccessResults vca_result =
4851 Reflection::verify_class_access(this_klass, k, false);
4852 if (vca_result != Reflection::ACCESS_OK) {
4853 ResourceMark rm(THREAD);
4854 char* msg = Reflection::verify_class_access_msg(this_klass,
4855 k,
4856 vca_result);
4857 if (msg == NULL) {
4858 bool same_module = (this_klass->module() == k->module());
4859 Exceptions::fthrow(
4860 THREAD_AND_LOCATION,
4861 vmSymbols::java_lang_IllegalAccessError(),
4862 "class %s cannot access its superinterface %s (%s%s%s)",
4863 this_klass->external_name(),
4864 k->external_name(),
4865 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4866 (same_module) ? "" : "; ",
4867 (same_module) ? "" : k->class_in_module_of_loader());
4868 } else {
4869 // Add additional message content.
4870 Exceptions::fthrow(
4871 THREAD_AND_LOCATION,
4872 vmSymbols::java_lang_IllegalAccessError(),
4873 "superinterface check failed: %s",
4874 msg);
4875 }
4876 }
4877 }
4878 }
4879
4880
4881 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4882 assert(this_klass != NULL, "invariant");
4883 const Array<Method*>* const methods = this_klass->methods();
4884 const int num_methods = methods->length();
4885
4886 // go thru each method and check if it overrides a final method
4887 for (int index = 0; index < num_methods; index++) {
4888 const Method* const m = methods->at(index);
4889
4890 // skip private, static, and <init> methods
4891 if ((!m->is_private() && !m->is_static()) &&
4892 (m->name() != vmSymbols::object_initializer_name())) {
4893
4894 const Symbol* const name = m->name();
4895 const Symbol* const signature = m->signature();
4896 const Klass* k = this_klass->super();
4897 const Method* super_m = NULL;
4898 while (k != NULL) {
4899 // skip supers that don't have final methods.
4900 if (k->has_final_method()) {
4901 // lookup a matching method in the super class hierarchy
4902 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4903 if (super_m == NULL) {
4904 break; // didn't find any match; get out
4905 }
4906
4907 if (super_m->is_final() && !super_m->is_static() &&
4908 !super_m->access_flags().is_private()) {
4909 // matching method in super is final, and not static or private
4910 bool can_access = Reflection::verify_member_access(this_klass,
4911 super_m->method_holder(),
4912 super_m->method_holder(),
4913 super_m->access_flags(),
4914 false, false, CHECK);
4915 if (can_access) {
4916 // this class can access super final method and therefore override
4917 ResourceMark rm(THREAD);
4918 Exceptions::fthrow(THREAD_AND_LOCATION,
4919 vmSymbols::java_lang_VerifyError(),
4920 "class %s overrides final method %s.%s%s",
4921 this_klass->external_name(),
4922 super_m->method_holder()->external_name(),
4923 name->as_C_string(),
4924 signature->as_C_string()
4925 );
4926 return;
4927 }
4928 }
4929
4930 // continue to look from super_m's holder's super.
4931 k = super_m->method_holder()->super();
4932 continue;
4933 }
4934
4935 k = k->super();
4936 }
4937 }
4938 }
4939 }
4940
4941
4942 // assumes that this_klass is an interface
4943 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4944 assert(this_klass != NULL, "invariant");
4945 assert(this_klass->is_interface(), "not an interface");
4946 const Array<Method*>* methods = this_klass->methods();
4947 const int num_methods = methods->length();
4948
4949 for (int index = 0; index < num_methods; index++) {
4950 const Method* const m = methods->at(index);
4951 // if m is static and not the init method, throw a verify error
4952 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4953 ResourceMark rm(THREAD);
4954 Exceptions::fthrow(
4955 THREAD_AND_LOCATION,
4956 vmSymbols::java_lang_VerifyError(),
4957 "Illegal static method %s in interface %s",
4958 m->name()->as_C_string(),
4959 this_klass->external_name()
4960 );
4961 return;
4962 }
4963 }
4964 }
4965
4966 // utility methods for format checking
4967
4968 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4969 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4970 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4971 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4972 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4973 if (is_module) {
4974 ResourceMark rm(THREAD);
4975 Exceptions::fthrow(
4976 THREAD_AND_LOCATION,
4977 vmSymbols::java_lang_NoClassDefFoundError(),
4978 "%s is not a class because access_flag ACC_MODULE is set",
4979 _class_name->as_C_string());
4980 return;
4981 }
4982
4983 if (is_value_type && !EnableValhalla) {
4984 ResourceMark rm(THREAD);
4985 Exceptions::fthrow(
4986 THREAD_AND_LOCATION,
4987 vmSymbols::java_lang_ClassFormatError(),
4988 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4989 _class_name->as_C_string()
4990 );
4991 }
4992
4993 if (!_need_verify) { return; }
4994
4995 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4996 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4997 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4998 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4999 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5000 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5001 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5002
5003 if ((is_abstract && is_final) ||
5004 (is_interface && !is_abstract) ||
5005 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5006 (!is_interface && major_gte_15 && is_annotation) ||
5007 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5008 ResourceMark rm(THREAD);
5009 Exceptions::fthrow(
5010 THREAD_AND_LOCATION,
5011 vmSymbols::java_lang_ClassFormatError(),
5012 "Illegal class modifiers in class %s: 0x%X",
5013 _class_name->as_C_string(), flags
5014 );
5015 return;
5016 }
5017 }
5018
5019 static bool has_illegal_visibility(jint flags) {
5020 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5021 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5022 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5023
5024 return ((is_public && is_protected) ||
5025 (is_public && is_private) ||
5026 (is_protected && is_private));
5027 }
5028
5029 // A legal major_version.minor_version must be one of the following:
5030 //
5031 // Major_version = 45, any minor_version.
5032 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5033 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5034 //
5035 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5036 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5037 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5038 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5039 if (major != max_version) {
5040 ResourceMark rm(THREAD);
5041 Exceptions::fthrow(
5042 THREAD_AND_LOCATION,
5043 vmSymbols::java_lang_UnsupportedClassVersionError(),
5044 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5045 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5046 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5047 return;
5048 }
5049
5050 if (!Arguments::enable_preview()) {
5051 ResourceMark rm(THREAD);
5052 Exceptions::fthrow(
5053 THREAD_AND_LOCATION,
5054 vmSymbols::java_lang_UnsupportedClassVersionError(),
5055 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5056 class_name->as_C_string(), major, minor);
5057 return;
5058 }
5059
5060 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5061 if (major > max_version) {
5062 ResourceMark rm(THREAD);
5063 Exceptions::fthrow(
5064 THREAD_AND_LOCATION,
5065 vmSymbols::java_lang_UnsupportedClassVersionError(),
5066 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5067 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5068 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5069 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5070 ResourceMark rm(THREAD);
5071 Exceptions::fthrow(
5072 THREAD_AND_LOCATION,
5073 vmSymbols::java_lang_UnsupportedClassVersionError(),
5074 "%s (class file version %u.%u) was compiled with an invalid major version",
5075 class_name->as_C_string(), major, minor);
5076 } else if (minor != 0) {
5077 ResourceMark rm(THREAD);
5078 Exceptions::fthrow(
5079 THREAD_AND_LOCATION,
5080 vmSymbols::java_lang_UnsupportedClassVersionError(),
5081 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5082 class_name->as_C_string(), major, minor);
5083 }
5084 }
5085 }
5086 }
5087
5088 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5089 bool is_interface,
5090 bool is_value_type,
5091 TRAPS) const {
5092 if (!_need_verify) { return; }
5093
5094 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5095 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5096 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5097 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5098 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5099 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5100 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5101 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5102 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5103
5104 bool is_illegal = false;
5105
5106 if (is_interface) {
5107 if (!is_public || !is_static || !is_final || is_private ||
5108 is_protected || is_volatile || is_transient ||
5109 (major_gte_15 && is_enum)) {
5110 is_illegal = true;
5111 }
5112 } else { // not interface
5113 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5114 is_illegal = true;
5115 } else {
5116 if (is_value_type && !is_static && !is_final) {
5117 is_illegal = true;
5118 }
5119 }
5120 }
5121
5122 if (is_illegal) {
5123 ResourceMark rm(THREAD);
5124 Exceptions::fthrow(
5125 THREAD_AND_LOCATION,
5126 vmSymbols::java_lang_ClassFormatError(),
5127 "Illegal field modifiers in class %s: 0x%X",
5128 _class_name->as_C_string(), flags);
5129 return;
5130 }
5131 }
5132
5133 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5134 bool is_interface,
5135 bool is_value_type,
5136 const Symbol* name,
5137 TRAPS) const {
5138 if (!_need_verify) { return; }
5139
5140 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5141 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5142 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5143 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5144 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5145 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5146 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5147 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5148 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5149 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5150 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5151 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5152 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5153
5154 bool is_illegal = false;
5155
5156 if (is_interface) {
5157 if (major_gte_8) {
5158 // Class file version is JAVA_8_VERSION or later Methods of
5159 // interfaces may set any of the flags except ACC_PROTECTED,
5160 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5161 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5162 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5163 (is_native || is_protected || is_final || is_synchronized) ||
5164 // If a specific method of a class or interface has its
5165 // ACC_ABSTRACT flag set, it must not have any of its
5166 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5167 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5168 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5169 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5170 (is_abstract && (is_private || is_static || is_strict))) {
5171 is_illegal = true;
5172 }
5173 } else if (major_gte_15) {
5174 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5175 if (!is_public || is_private || is_protected || is_static || is_final ||
5176 is_synchronized || is_native || !is_abstract || is_strict) {
5177 is_illegal = true;
5178 }
5179 } else {
5180 // Class file version is pre-JAVA_1_5_VERSION
5181 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5182 is_illegal = true;
5183 }
5184 }
5185 } else { // not interface
5186 if (has_illegal_visibility(flags)) {
5187 is_illegal = true;
5188 } else {
5189 if (is_initializer) {
5190 if (is_static || is_final || is_synchronized || is_native ||
5191 is_abstract || (major_gte_15 && is_bridge)) {
5192 is_illegal = true;
5193 }
5194 } else { // not initializer
5195 if (is_value_type && is_synchronized && !is_static) {
5196 is_illegal = true;
5197 } else {
5198 if (is_abstract) {
5199 if ((is_final || is_native || is_private || is_static ||
5200 (major_gte_15 && (is_synchronized || is_strict)))) {
5201 is_illegal = true;
5202 }
5203 }
5204 }
5205 }
5206 }
5207 }
5208
5209 if (is_illegal) {
5210 ResourceMark rm(THREAD);
5211 Exceptions::fthrow(
5212 THREAD_AND_LOCATION,
5213 vmSymbols::java_lang_ClassFormatError(),
5214 "Method %s in class %s has illegal modifiers: 0x%X",
5215 name->as_C_string(), _class_name->as_C_string(), flags);
5216 return;
5217 }
5218 }
5219
5220 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5221 int length,
5222 TRAPS) const {
5223 assert(_need_verify, "only called when _need_verify is true");
5224 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5225 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5226 }
5227 }
5228
5229 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5230 // In class names, '/' separates unqualified names. This is verified in this function also.
5231 // Method names also may not contain the characters '<' or '>', unless <init>
5232 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5233 // method. Because these names have been checked as special cases before
5234 // calling this method in verify_legal_method_name.
5235 //
5236 // This method is also called from the modular system APIs in modules.cpp
5237 // to verify the validity of module and package names.
5238 bool ClassFileParser::verify_unqualified_name(const char* name,
5239 unsigned int length,
5240 int type) {
5241 for (const char* p = name; p != name + length; p++) {
5242 switch(*p) {
5243 case '.':
5244 case ';':
5245 case '[':
5246 // do not permit '.', ';', or '['
5247 return false;
5248 case '/':
5249 // check for '//' or leading or trailing '/' which are not legal
5250 // unqualified name must not be empty
5251 if (type == ClassFileParser::LegalClass) {
5252 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5253 return false;
5254 }
5255 } else {
5256 return false; // do not permit '/' unless it's class name
5257 }
5258 break;
5259 case '<':
5260 case '>':
5261 // do not permit '<' or '>' in method names
5262 if (type == ClassFileParser::LegalMethod) {
5263 return false;
5264 }
5265 }
5266 }
5267 return true;
5268 }
5269
5270 // Take pointer to a UTF8 byte string (not NUL-terminated).
5271 // Skip over the longest part of the string that could
5272 // be taken as a fieldname. Allow '/' if slash_ok is true.
5273 // Return a pointer to just past the fieldname.
5274 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5275 // being true, we saw consecutive slashes (meaning we were looking for a
5276 // qualified path but found something that was badly-formed).
5277 static const char* skip_over_field_name(const char* const name,
5278 bool slash_ok,
5279 unsigned int length) {
5280 const char* p;
5281 jboolean last_is_slash = false;
5282 jboolean not_first_ch = false;
5283
5284 for (p = name; p != name + length; not_first_ch = true) {
5285 const char* old_p = p;
5286 jchar ch = *p;
5287 if (ch < 128) {
5288 p++;
5289 // quick check for ascii
5290 if ((ch >= 'a' && ch <= 'z') ||
5291 (ch >= 'A' && ch <= 'Z') ||
5292 (ch == '_' || ch == '$') ||
5293 (not_first_ch && ch >= '0' && ch <= '9')) {
5294 last_is_slash = false;
5295 continue;
5296 }
5297 if (slash_ok && ch == '/') {
5298 if (last_is_slash) {
5299 return NULL; // Don't permit consecutive slashes
5300 }
5301 last_is_slash = true;
5302 continue;
5303 }
5304 }
5305 else {
5306 jint unicode_ch;
5307 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5308 p = tmp_p;
5309 last_is_slash = false;
5310 // Check if ch is Java identifier start or is Java identifier part
5311 // 4672820: call java.lang.Character methods directly without generating separate tables.
5312 EXCEPTION_MARK;
5313 // return value
5314 JavaValue result(T_BOOLEAN);
5315 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5316 JavaCallArguments args;
5317 args.push_int(unicode_ch);
5318
5319 if (not_first_ch) {
5320 // public static boolean isJavaIdentifierPart(char ch);
5321 JavaCalls::call_static(&result,
5322 SystemDictionary::Character_klass(),
5323 vmSymbols::isJavaIdentifierPart_name(),
5324 vmSymbols::int_bool_signature(),
5325 &args,
5326 THREAD);
5327 } else {
5328 // public static boolean isJavaIdentifierStart(char ch);
5329 JavaCalls::call_static(&result,
5330 SystemDictionary::Character_klass(),
5331 vmSymbols::isJavaIdentifierStart_name(),
5332 vmSymbols::int_bool_signature(),
5333 &args,
5334 THREAD);
5335 }
5336 if (HAS_PENDING_EXCEPTION) {
5337 CLEAR_PENDING_EXCEPTION;
5338 return NULL;
5339 }
5340 if(result.get_jboolean()) {
5341 continue;
5342 }
5343 }
5344 return (not_first_ch) ? old_p : NULL;
5345 }
5346 return (not_first_ch) ? p : NULL;
5347 }
5348
5349 // Take pointer to a UTF8 byte string (not NUL-terminated).
5350 // Skip over the longest part of the string that could
5351 // be taken as a field signature. Allow "void" if void_ok.
5352 // Return a pointer to just past the signature.
5353 // Return NULL if no legal signature is found.
5354 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5355 bool void_ok,
5356 unsigned int length,
5357 TRAPS) const {
5358 unsigned int array_dim = 0;
5359 while (length > 0) {
5360 switch (signature[0]) {
5361 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5362 case JVM_SIGNATURE_BOOLEAN:
5363 case JVM_SIGNATURE_BYTE:
5364 case JVM_SIGNATURE_CHAR:
5365 case JVM_SIGNATURE_SHORT:
5366 case JVM_SIGNATURE_INT:
5367 case JVM_SIGNATURE_FLOAT:
5368 case JVM_SIGNATURE_LONG:
5369 case JVM_SIGNATURE_DOUBLE:
5370 return signature + 1;
5371 case JVM_SIGNATURE_VALUETYPE:
5372 // Can't enable this check until JDK upgrades the bytecode generators
5373 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5374 // classfile_parse_error("Class name contains illegal Q-signature "
5375 // "in descriptor in class file %s",
5376 // CHECK_0);
5377 // }
5378 // fall through
5379 case JVM_SIGNATURE_CLASS:
5380 {
5381 if (_major_version < JAVA_1_5_VERSION) {
5382 // Skip over the class name if one is there
5383 const char* const p = skip_over_field_name(signature + 1, true, --length);
5384
5385 // The next character better be a semicolon
5386 if (p && (p - signature) > 1 && p[0] == ';') {
5387 return p + 1;
5388 }
5389 }
5390 else {
5391 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5392 signature++;
5393 const char* c = (const char*) memchr(signature, ';', length - 1);
5394 // Format check signature
5395 if (c != NULL) {
5396 int newlen = c - (char*) signature;
5397 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5398 if (!legal) {
5399 classfile_parse_error("Class name contains illegal character "
5400 "in descriptor in class file %s",
5401 CHECK_0);
5402 return NULL;
5403 }
5404 return signature + newlen + 1;
5405 }
5406 }
5407 return NULL;
5408 }
5409 case JVM_SIGNATURE_ARRAY:
5410 array_dim++;
5411 if (array_dim > 255) {
5412 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5413 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5414 }
5415 // The rest of what's there better be a legal signature
5416 signature++;
5417 length--;
5418 void_ok = false;
5419 break;
5420 default:
5421 return NULL;
5422 }
5423 }
5424 return NULL;
5425 }
5426
5427 // Checks if name is a legal class name.
5428 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5429 if (!_need_verify || _relax_verify) { return; }
5430
5431 assert(name->refcount() > 0, "symbol must be kept alive");
5432 char* bytes = (char*)name->bytes();
5433 unsigned int length = name->utf8_length();
5434 bool legal = false;
5435
5436 if (length > 0) {
5437 const char* p;
5438 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5439 p = skip_over_field_signature(bytes, false, length, CHECK);
5440 legal = (p != NULL) && ((p - bytes) == (int)length);
5441 } else if (_major_version < JAVA_1_5_VERSION) {
5442 if (bytes[0] != '<') {
5443 p = skip_over_field_name(bytes, true, length);
5444 legal = (p != NULL) && ((p - bytes) == (int)length);
5445 }
5446 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5447 // Support for L...; and Q...; descriptors
5448 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5449 } else {
5450 // 4900761: relax the constraints based on JSR202 spec
5451 // Class names may be drawn from the entire Unicode character set.
5452 // Identifiers between '/' must be unqualified names.
5453 // The utf8 string has been verified when parsing cpool entries.
5454 legal = verify_unqualified_name(bytes, length, LegalClass);
5455 }
5456 }
5457 if (!legal) {
5458 ResourceMark rm(THREAD);
5459 assert(_class_name != NULL, "invariant");
5460 Exceptions::fthrow(
5461 THREAD_AND_LOCATION,
5462 vmSymbols::java_lang_ClassFormatError(),
5463 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5464 _class_name->as_C_string()
5465 );
5466 return;
5467 }
5468 }
5469
5470 // Checks if name is a legal field name.
5471 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5472 if (!_need_verify || _relax_verify) { return; }
5473
5474 char* bytes = (char*)name->bytes();
5475 unsigned int length = name->utf8_length();
5476 bool legal = false;
5477
5478 if (length > 0) {
5479 if (_major_version < JAVA_1_5_VERSION) {
5480 if (bytes[0] != '<') {
5481 const char* p = skip_over_field_name(bytes, false, length);
5482 legal = (p != NULL) && ((p - bytes) == (int)length);
5483 }
5484 } else {
5485 // 4881221: relax the constraints based on JSR202 spec
5486 legal = verify_unqualified_name(bytes, length, LegalField);
5487 }
5488 }
5489
5490 if (!legal) {
5491 ResourceMark rm(THREAD);
5492 assert(_class_name != NULL, "invariant");
5493 Exceptions::fthrow(
5494 THREAD_AND_LOCATION,
5495 vmSymbols::java_lang_ClassFormatError(),
5496 "Illegal field name \"%.*s\" in class %s", length, bytes,
5497 _class_name->as_C_string()
5498 );
5499 return;
5500 }
5501 }
5502
5503 // Checks if name is a legal method name.
5504 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5505 if (!_need_verify || _relax_verify) { return; }
5506
5507 assert(name != NULL, "method name is null");
5508 char* bytes = (char*)name->bytes();
5509 unsigned int length = name->utf8_length();
5510 bool legal = false;
5511
5512 if (length > 0) {
5513 if (bytes[0] == '<') {
5514 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5515 legal = true;
5516 }
5517 } else if (_major_version < JAVA_1_5_VERSION) {
5518 const char* p;
5519 p = skip_over_field_name(bytes, false, length);
5520 legal = (p != NULL) && ((p - bytes) == (int)length);
5521 } else {
5522 // 4881221: relax the constraints based on JSR202 spec
5523 legal = verify_unqualified_name(bytes, length, LegalMethod);
5524 }
5525 }
5526
5527 if (!legal) {
5528 ResourceMark rm(THREAD);
5529 assert(_class_name != NULL, "invariant");
5530 Exceptions::fthrow(
5531 THREAD_AND_LOCATION,
5532 vmSymbols::java_lang_ClassFormatError(),
5533 "Illegal method name \"%.*s\" in class %s", length, bytes,
5534 _class_name->as_C_string()
5535 );
5536 return;
5537 }
5538 }
5539
5540
5541 // Checks if signature is a legal field signature.
5542 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5543 const Symbol* signature,
5544 TRAPS) const {
5545 if (!_need_verify) { return; }
5546
5547 const char* const bytes = (const char* const)signature->bytes();
5548 const unsigned int length = signature->utf8_length();
5549 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5550
5551 if (p == NULL || (p - bytes) != (int)length) {
5552 throwIllegalSignature("Field", name, signature, CHECK);
5553 }
5554 }
5555
5556 // Checks if signature is a legal method signature.
5557 // Returns number of parameters
5558 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5559 const Symbol* signature,
5560 TRAPS) const {
5561 if (!_need_verify) {
5562 // make sure caller's args_size will be less than 0 even for non-static
5563 // method so it will be recomputed in compute_size_of_parameters().
5564 return -2;
5565 }
5566
5567 // Class initializers cannot have args for class format version >= 51.
5568 if (name == vmSymbols::class_initializer_name() &&
5569 signature != vmSymbols::void_method_signature() &&
5570 _major_version >= JAVA_7_VERSION) {
5571 throwIllegalSignature("Method", name, signature, CHECK_0);
5572 return 0;
5573 }
5574
5575 unsigned int args_size = 0;
5576 const char* p = (const char*)signature->bytes();
5577 unsigned int length = signature->utf8_length();
5578 const char* nextp;
5579
5580 // The first character must be a '('
5581 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5582 length--;
5583 // Skip over legal field signatures
5584 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5585 while ((length > 0) && (nextp != NULL)) {
5586 args_size++;
5587 if (p[0] == 'J' || p[0] == 'D') {
5588 args_size++;
5589 }
5590 length -= nextp - p;
5591 p = nextp;
5592 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5593 }
5594 // The first non-signature thing better be a ')'
5595 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5596 length--;
5597 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5598 // All internal methods must return void
5599 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5600 return args_size;
5601 }
5602 } else {
5603 // Now we better just have a return value
5604 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5605 if (nextp && ((int)length == (nextp - p))) {
5606 return args_size;
5607 }
5608 }
5609 }
5610 }
5611 // Report error
5612 throwIllegalSignature("Method", name, signature, CHECK_0);
5613 return 0;
5614 }
5615
5616 int ClassFileParser::static_field_size() const {
5617 assert(_field_info != NULL, "invariant");
5618 return _field_info->static_field_size;
5619 }
5620
5621 int ClassFileParser::total_oop_map_count() const {
5622 assert(_field_info != NULL, "invariant");
5623 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5624 }
5625
5626 jint ClassFileParser::layout_size() const {
5627 assert(_field_info != NULL, "invariant");
5628 return _field_info->instance_size;
5629 }
5630
5631 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5632 const Array<Method*>* methods) {
5633 assert(ik != NULL, "invariant");
5634 assert(methods != NULL, "invariant");
5635
5636 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5637 // (We used to do this lazily, but now we query it in Rewriter,
5638 // which is eagerly done for every method, so we might as well do it now,
5639 // when everything is fresh in memory.)
5640 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5641
5642 if (klass_id != vmSymbols::NO_SID) {
5643 for (int j = 0; j < methods->length(); ++j) {
5644 Method* method = methods->at(j);
5645 method->init_intrinsic_id();
5646
5647 if (CheckIntrinsics) {
5648 // Check if an intrinsic is defined for method 'method',
5649 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5650 if (method->intrinsic_id() != vmIntrinsics::_none &&
5651 !method->intrinsic_candidate()) {
5652 tty->print("Compiler intrinsic is defined for method [%s], "
5653 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5654 method->name_and_sig_as_C_string(),
5655 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5656 );
5657 tty->cr();
5658 DEBUG_ONLY(vm_exit(1));
5659 }
5660 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5661 // but there is no intrinsic available for it.
5662 if (method->intrinsic_candidate() &&
5663 method->intrinsic_id() == vmIntrinsics::_none) {
5664 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5665 "but no compiler intrinsic is defined for the method.%s",
5666 method->name_and_sig_as_C_string(),
5667 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5668 );
5669 tty->cr();
5670 DEBUG_ONLY(vm_exit(1));
5671 }
5672 }
5673 } // end for
5674
5675 #ifdef ASSERT
5676 if (CheckIntrinsics) {
5677 // Check for orphan methods in the current class. A method m
5678 // of a class C is orphan if an intrinsic is defined for method m,
5679 // but class C does not declare m.
5680 // The check is potentially expensive, therefore it is available
5681 // only in debug builds.
5682
5683 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5684 if (vmIntrinsics::_compiledLambdaForm == id) {
5685 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5686 // generated for the JVM from a LambdaForm and therefore no method
5687 // is defined for it.
5688 continue;
5689 }
5690
5691 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5692 // Check if the current class contains a method with the same
5693 // name, flags, signature.
5694 bool match = false;
5695 for (int j = 0; j < methods->length(); ++j) {
5696 const Method* method = methods->at(j);
5697 if (method->intrinsic_id() == id) {
5698 match = true;
5699 break;
5700 }
5701 }
5702
5703 if (!match) {
5704 char buf[1000];
5705 tty->print("Compiler intrinsic is defined for method [%s], "
5706 "but the method is not available in class [%s].%s",
5707 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5708 buf, sizeof(buf)),
5709 ik->name()->as_C_string(),
5710 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5711 );
5712 tty->cr();
5713 DEBUG_ONLY(vm_exit(1));
5714 }
5715 }
5716 } // end for
5717 } // CheckIntrinsics
5718 #endif // ASSERT
5719 }
5720 }
5721
5722 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5723 if (_klass != NULL) {
5724 return _klass;
5725 }
5726
5727 InstanceKlass* const ik =
5728 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5729
5730 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5731
5732 assert(_klass == ik, "invariant");
5733
5734
5735 if (ik->should_store_fingerprint()) {
5736 ik->store_fingerprint(_stream->compute_fingerprint());
5737 }
5738
5739 ik->set_has_passed_fingerprint_check(false);
5740 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5741 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5742 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5743 if (aot_fp != 0 && aot_fp == fp) {
5744 // This class matches with a class saved in an AOT library
5745 ik->set_has_passed_fingerprint_check(true);
5746 } else {
5747 ResourceMark rm;
5748 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5749 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5750 }
5751 }
5752
5753 if (ik->is_value()) {
5754 ValueKlass* vk = ValueKlass::cast(ik);
5755 oop val = ik->allocate_instance(CHECK_NULL);
5756 vk->set_default_value(val);
5757 }
5758
5759 return ik;
5760 }
5761
5762 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5763 assert(ik != NULL, "invariant");
5764
5765 // Set name and CLD before adding to CLD
5766 ik->set_class_loader_data(_loader_data);
5767 ik->set_name(_class_name);
5768
5769 // Add all classes to our internal class loader list here,
5770 // including classes in the bootstrap (NULL) class loader.
5771 const bool publicize = !is_internal();
5772
5773 _loader_data->add_class(ik, publicize);
5774
5775 set_klass_to_deallocate(ik);
5776
5777 assert(_field_info != NULL, "invariant");
5778 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5779 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5780 "sanity");
5781
5782 assert(ik->is_instance_klass(), "sanity");
5783 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5784
5785 // Fill in information already parsed
5786 ik->set_should_verify_class(_need_verify);
5787
5788 // Not yet: supers are done below to support the new subtype-checking fields
5789 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5790 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5791 assert(_fac != NULL, "invariant");
5792 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5793
5794 // this transfers ownership of a lot of arrays from
5795 // the parser onto the InstanceKlass*
5796 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5797
5798 // note that is not safe to use the fields in the parser from this point on
5799 assert(NULL == _cp, "invariant");
5800 assert(NULL == _fields, "invariant");
5801 assert(NULL == _methods, "invariant");
5802 assert(NULL == _inner_classes, "invariant");
5803 assert(NULL == _nest_members, "invariant");
5804 assert(NULL == _local_interfaces, "invariant");
5805 assert(NULL == _combined_annotations, "invariant");
5806
5807 if (_has_final_method) {
5808 ik->set_has_final_method();
5809 }
5810
5811 ik->copy_method_ordering(_method_ordering, CHECK);
5812 // The InstanceKlass::_methods_jmethod_ids cache
5813 // is managed on the assumption that the initial cache
5814 // size is equal to the number of methods in the class. If
5815 // that changes, then InstanceKlass::idnum_can_increment()
5816 // has to be changed accordingly.
5817 ik->set_initial_method_idnum(ik->methods()->length());
5818
5819 ik->set_this_class_index(_this_class_index);
5820
5821 if (is_unsafe_anonymous()) {
5822 // _this_class_index is a CONSTANT_Class entry that refers to this
5823 // anonymous class itself. If this class needs to refer to its own methods or
5824 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5825 // _this_class_index. However, because this class is anonymous (it's
5826 // not stored in SystemDictionary), _this_class_index cannot be resolved
5827 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5828 // Therefore, we must eagerly resolve _this_class_index now.
5829 ik->constants()->klass_at_put(_this_class_index, ik);
5830 }
5831
5832 ik->set_minor_version(_minor_version);
5833 ik->set_major_version(_major_version);
5834 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5835 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5836
5837 if (_unsafe_anonymous_host != NULL) {
5838 assert (ik->is_unsafe_anonymous(), "should be the same");
5839 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5840 }
5841
5842 // Set PackageEntry for this_klass
5843 oop cl = ik->class_loader();
5844 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5845 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5846 ik->set_package(cld, CHECK);
5847
5848 const Array<Method*>* const methods = ik->methods();
5849 assert(methods != NULL, "invariant");
5850 const int methods_len = methods->length();
5851
5852 check_methods_for_intrinsics(ik, methods);
5853
5854 // Fill in field values obtained by parse_classfile_attributes
5855 if (_parsed_annotations->has_any_annotations()) {
5856 _parsed_annotations->apply_to(ik);
5857 }
5858
5859 apply_parsed_class_attributes(ik);
5860
5861 // Miranda methods
5862 if ((_num_miranda_methods > 0) ||
5863 // if this class introduced new miranda methods or
5864 (_super_klass != NULL && _super_klass->has_miranda_methods())
5865 // super class exists and this class inherited miranda methods
5866 ) {
5867 ik->set_has_miranda_methods(); // then set a flag
5868 }
5869
5870 // Fill in information needed to compute superclasses.
5871 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5872 ik->set_transitive_interfaces(_transitive_interfaces);
5873 _transitive_interfaces = NULL;
5874
5875 // Initialize itable offset tables
5876 klassItable::setup_itable_offset_table(ik);
5877
5878 // Compute transitive closure of interfaces this class implements
5879 // Do final class setup
5880 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5881 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5882 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5883 }
5884
5885 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5886 set_precomputed_flags(ik, CHECK);
5887
5888 // check if this class can access its super class
5889 check_super_class_access(ik, CHECK);
5890
5891 // check if this class can access its superinterfaces
5892 check_super_interface_access(ik, CHECK);
5893
5894 // check if this class overrides any final method
5895 check_final_method_override(ik, CHECK);
5896
5897 // reject static interface methods prior to Java 8
5898 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5899 check_illegal_static_method(ik, CHECK);
5900 }
5901
5902 // Obtain this_klass' module entry
5903 ModuleEntry* module_entry = ik->module();
5904 assert(module_entry != NULL, "module_entry should always be set");
5905
5906 // Obtain java.lang.Module
5907 Handle module_handle(THREAD, module_entry->module());
5908
5909 // Allocate mirror and initialize static fields
5910 // The create_mirror() call will also call compute_modifiers()
5911 java_lang_Class::create_mirror(ik,
5912 Handle(THREAD, _loader_data->class_loader()),
5913 module_handle,
5914 _protection_domain,
5915 CHECK);
5916
5917 assert(_all_mirandas != NULL, "invariant");
5918
5919 // Generate any default methods - default methods are public interface methods
5920 // that have a default implementation. This is new with Java 8.
5921 if (_has_nonstatic_concrete_methods) {
5922 DefaultMethods::generate_default_methods(ik,
5923 _all_mirandas,
5924 CHECK);
5925 }
5926
5927 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5928 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5929 !module_entry->has_default_read_edges()) {
5930 if (!module_entry->set_has_default_read_edges()) {
5931 // We won a potential race
5932 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5933 }
5934 }
5935
5936 int nfields = ik->java_fields_count();
5937 if (ik->is_value()) nfields++;
5938 for (int i = 0; i < nfields; i++) {
5939 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
5940 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
5941 // Value classes must have been pre-loaded
5942 Klass* klass = SystemDictionary::find(klass_name,
5943 Handle(THREAD, ik->class_loader()),
5944 Handle(THREAD, ik->protection_domain()), CHECK);
5945 assert(klass != NULL, "Sanity check");
5946 assert(klass->access_flags().is_value_type(), "Value type expected");
5947 ik->set_value_field_klass(i, klass);
5948 klass_name->decrement_refcount();
5949 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5950 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5951 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5952 }
5953 }
5954
5955 if (is_value_type()) {
5956 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
5957 }
5958
5959 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5960
5961 if (!is_internal()) {
5962 if (log_is_enabled(Info, class, load)) {
5963 ResourceMark rm;
5964 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5965 ik->print_class_load_logging(_loader_data, module_name, _stream);
5966 }
5967
5968 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5969 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5970 log_is_enabled(Info, class, preview)) {
5971 ResourceMark rm;
5972 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5973 ik->external_name(), ik->major_version());
5974 }
5975
5976 if (log_is_enabled(Debug, class, resolve)) {
5977 ResourceMark rm;
5978 // print out the superclass.
5979 const char * from = ik->external_name();
5980 if (ik->java_super() != NULL) {
5981 log_debug(class, resolve)("%s %s (super)",
5982 from,
5983 ik->java_super()->external_name());
5984 }
5985 // print out each of the interface classes referred to by this class.
5986 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5987 if (local_interfaces != NULL) {
5988 const int length = local_interfaces->length();
5989 for (int i = 0; i < length; i++) {
5990 const InstanceKlass* const k = local_interfaces->at(i);
5991 const char * to = k->external_name();
5992 log_debug(class, resolve)("%s %s (interface)", from, to);
5993 }
5994 }
5995 }
5996 }
5997
5998 JFR_ONLY(INIT_ID(ik);)
5999
6000 // If we reach here, all is well.
6001 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6002 // in order for it to not be destroyed in the ClassFileParser destructor.
6003 set_klass_to_deallocate(NULL);
6004
6005 // it's official
6006 set_klass(ik);
6007
6008 debug_only(ik->verify();)
6009 }
6010
6011 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6012 // Decrement the refcount in the old name, since we're clobbering it.
6013 _class_name->decrement_refcount();
6014
6015 _class_name = new_class_name;
6016 // Increment the refcount of the new name.
6017 // Now the ClassFileParser owns this name and will decrement in
6018 // the destructor.
6019 _class_name->increment_refcount();
6020 }
6021
6022
6023 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6024 // package by prepending its host class's package name to its class name and setting
6025 // its _class_name field.
6026 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6027 ResourceMark rm(THREAD);
6028 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6029 "Unsafe anonymous class should not be in a package");
6030 const char* host_pkg_name =
6031 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6032
6033 if (host_pkg_name != NULL) {
6034 int host_pkg_len = (int)strlen(host_pkg_name);
6035 int class_name_len = _class_name->utf8_length();
6036 int symbol_len = host_pkg_len + 1 + class_name_len;
6037 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6038 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
6039 host_pkg_name, class_name_len, _class_name->base());
6040 assert(n == symbol_len, "Unexpected number of characters in string");
6041
6042 // Decrement old _class_name to avoid leaking.
6043 _class_name->decrement_refcount();
6044
6045 // Create a symbol and update the anonymous class name.
6046 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6047 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6048 // when the class is unloaded.
6049 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len, CHECK);
6050 }
6051 }
6052
6053 // If the host class and the anonymous class are in the same package then do
6054 // nothing. If the anonymous class is in the unnamed package then move it to its
6055 // host's package. If the classes are in different packages then throw an IAE
6056 // exception.
6057 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6058 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6059
6060 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6061 _class_name->utf8_length(), '/');
6062 if (anon_last_slash == NULL) { // Unnamed package
6063 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6064 } else {
6065 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6066 ResourceMark rm(THREAD);
6067 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6068 err_msg("Host class %s and anonymous class %s are in different packages",
6069 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6070 }
6071 }
6072 }
6073
6074 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6075 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6076 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6077 bool need_verify =
6078 // verifyAll
6079 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6080 // verifyRemote
6081 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6082 return !need_verify;
6083 }
6084
6085 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6086 Symbol* name,
6087 ClassLoaderData* loader_data,
6088 Handle protection_domain,
6089 const InstanceKlass* unsafe_anonymous_host,
6090 GrowableArray<Handle>* cp_patches,
6091 Publicity pub_level,
6092 TRAPS) :
6093 _stream(stream),
6094 _requested_name(name),
6095 _class_name(NULL),
6096 _loader_data(loader_data),
6097 _unsafe_anonymous_host(unsafe_anonymous_host),
6098 _cp_patches(cp_patches),
6099 _num_patched_klasses(0),
6100 _max_num_patched_klasses(0),
6101 _orig_cp_size(0),
6102 _first_patched_klass_resolved_index(0),
6103 _super_klass(),
6104 _cp(NULL),
6105 _fields(NULL),
6106 _methods(NULL),
6107 _inner_classes(NULL),
6108 _nest_members(NULL),
6109 _nest_host(0),
6110 _local_interfaces(NULL),
6111 _transitive_interfaces(NULL),
6112 _combined_annotations(NULL),
6113 _annotations(NULL),
6114 _type_annotations(NULL),
6115 _fields_annotations(NULL),
6116 _fields_type_annotations(NULL),
6117 _klass(NULL),
6118 _klass_to_deallocate(NULL),
6119 _parsed_annotations(NULL),
6120 _fac(NULL),
6121 _field_info(NULL),
6122 _method_ordering(NULL),
6123 _all_mirandas(NULL),
6124 _vtable_size(0),
6125 _itable_size(0),
6126 _num_miranda_methods(0),
6127 _rt(REF_NONE),
6128 _protection_domain(protection_domain),
6129 _access_flags(),
6130 _pub_level(pub_level),
6131 _bad_constant_seen(0),
6132 _synthetic_flag(false),
6133 _sde_length(false),
6134 _sde_buffer(NULL),
6135 _sourcefile_index(0),
6136 _generic_signature_index(0),
6137 _major_version(0),
6138 _minor_version(0),
6139 _this_class_index(0),
6140 _super_class_index(0),
6141 _itfs_len(0),
6142 _java_fields_count(0),
6143 _need_verify(false),
6144 _relax_verify(false),
6145 _has_nonstatic_concrete_methods(false),
6146 _declares_nonstatic_concrete_methods(false),
6147 _has_final_method(false),
6148 _has_flattenable_fields(false),
6149 _has_finalizer(false),
6150 _has_empty_finalizer(false),
6151 _has_vanilla_constructor(false),
6152 _max_bootstrap_specifier_index(-1) {
6153
6154 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6155 _class_name->increment_refcount();
6156
6157 assert(THREAD->is_Java_thread(), "invariant");
6158 assert(_loader_data != NULL, "invariant");
6159 assert(stream != NULL, "invariant");
6160 assert(_stream != NULL, "invariant");
6161 assert(_stream->buffer() == _stream->current(), "invariant");
6162 assert(_class_name != NULL, "invariant");
6163 assert(0 == _access_flags.as_int(), "invariant");
6164
6165 // Figure out whether we can skip format checking (matching classic VM behavior)
6166 if (DumpSharedSpaces) {
6167 // verify == true means it's a 'remote' class (i.e., non-boot class)
6168 // Verification decision is based on BytecodeVerificationRemote flag
6169 // for those classes.
6170 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6171 BytecodeVerificationLocal;
6172 }
6173 else {
6174 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6175 stream->need_verify());
6176 }
6177 if (_cp_patches != NULL) {
6178 int len = _cp_patches->length();
6179 for (int i=0; i<len; i++) {
6180 if (has_cp_patch_at(i)) {
6181 Handle patch = cp_patch_at(i);
6182 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6183 // We need to append the names of the patched classes to the end of the constant pool,
6184 // because a patched class may have a Utf8 name that's not already included in the
6185 // original constant pool. These class names are used when patch_constant_pool()
6186 // calls patch_class().
6187 //
6188 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6189 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6190 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6191 _max_num_patched_klasses++;
6192 }
6193 }
6194 }
6195 }
6196
6197 // synch back verification state to stream
6198 stream->set_verify(_need_verify);
6199
6200 // Check if verification needs to be relaxed for this class file
6201 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6202 _relax_verify = relax_format_check_for(_loader_data);
6203
6204 parse_stream(stream, CHECK);
6205
6206 post_process_parsed_stream(stream, _cp, CHECK);
6207 }
6208
6209 void ClassFileParser::clear_class_metadata() {
6210 // metadata created before the instance klass is created. Must be
6211 // deallocated if classfile parsing returns an error.
6212 _cp = NULL;
6213 _fields = NULL;
6214 _methods = NULL;
6215 _inner_classes = NULL;
6216 _nest_members = NULL;
6217 _local_interfaces = NULL;
6218 _combined_annotations = NULL;
6219 _annotations = _type_annotations = NULL;
6220 _fields_annotations = _fields_type_annotations = NULL;
6221 }
6222
6223 // Destructor to clean up
6224 ClassFileParser::~ClassFileParser() {
6225 _class_name->decrement_refcount();
6226
6227 if (_cp != NULL) {
6228 MetadataFactory::free_metadata(_loader_data, _cp);
6229 }
6230 if (_fields != NULL) {
6231 MetadataFactory::free_array<u2>(_loader_data, _fields);
6232 }
6233
6234 if (_methods != NULL) {
6235 // Free methods
6236 InstanceKlass::deallocate_methods(_loader_data, _methods);
6237 }
6238
6239 // beware of the Universe::empty_blah_array!!
6240 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6241 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6242 }
6243
6244 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6245 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6246 }
6247
6248 // Free interfaces
6249 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6250 _local_interfaces, _transitive_interfaces);
6251
6252 if (_combined_annotations != NULL) {
6253 // After all annotations arrays have been created, they are installed into the
6254 // Annotations object that will be assigned to the InstanceKlass being created.
6255
6256 // Deallocate the Annotations object and the installed annotations arrays.
6257 _combined_annotations->deallocate_contents(_loader_data);
6258
6259 // If the _combined_annotations pointer is non-NULL,
6260 // then the other annotations fields should have been cleared.
6261 assert(_annotations == NULL, "Should have been cleared");
6262 assert(_type_annotations == NULL, "Should have been cleared");
6263 assert(_fields_annotations == NULL, "Should have been cleared");
6264 assert(_fields_type_annotations == NULL, "Should have been cleared");
6265 } else {
6266 // If the annotations arrays were not installed into the Annotations object,
6267 // then they have to be deallocated explicitly.
6268 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6269 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6270 Annotations::free_contents(_loader_data, _fields_annotations);
6271 Annotations::free_contents(_loader_data, _fields_type_annotations);
6272 }
6273
6274 clear_class_metadata();
6275 _transitive_interfaces = NULL;
6276
6277 // deallocate the klass if already created. Don't directly deallocate, but add
6278 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6279 // at a safepoint.
6280 if (_klass_to_deallocate != NULL) {
6281 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6282 }
6283 }
6284
6285 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6286 TRAPS) {
6287
6288 assert(stream != NULL, "invariant");
6289 assert(_class_name != NULL, "invariant");
6290
6291 // BEGIN STREAM PARSING
6292 stream->guarantee_more(8, CHECK); // magic, major, minor
6293 // Magic value
6294 const u4 magic = stream->get_u4_fast();
6295 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6296 "Incompatible magic value %u in class file %s",
6297 magic, CHECK);
6298
6299 // Version numbers
6300 _minor_version = stream->get_u2_fast();
6301 _major_version = stream->get_u2_fast();
6302
6303 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6304 ResourceMark rm;
6305 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6306 _major_version, _minor_version, _class_name->as_C_string());
6307 Exceptions::fthrow(
6308 THREAD_AND_LOCATION,
6309 vmSymbols::java_lang_UnsupportedClassVersionError(),
6310 "Unsupported major.minor version for dump time %u.%u",
6311 _major_version,
6312 _minor_version);
6313 }
6314
6315 // Check version numbers - we check this even with verifier off
6316 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6317
6318 stream->guarantee_more(3, CHECK); // length, first cp tag
6319 u2 cp_size = stream->get_u2_fast();
6320
6321 guarantee_property(
6322 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6323 cp_size, CHECK);
6324
6325 _orig_cp_size = cp_size;
6326 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6327 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6328 }
6329 cp_size += _max_num_patched_klasses;
6330
6331 _cp = ConstantPool::allocate(_loader_data,
6332 cp_size,
6333 CHECK);
6334
6335 ConstantPool* const cp = _cp;
6336
6337 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6338
6339 assert(cp_size == (const u2)cp->length(), "invariant");
6340
6341 // ACCESS FLAGS
6342 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6343
6344 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6345 // JVM_ACC_MODULE is defined in JDK-9 and later.
6346 if (_major_version >= JAVA_9_VERSION) {
6347 recognized_modifiers |= JVM_ACC_MODULE;
6348 }
6349 // JVM_ACC_VALUE is defined for class file version 55 and later
6350 if (supports_value_types()) {
6351 recognized_modifiers |= JVM_ACC_VALUE;
6352 }
6353
6354 // Access flags
6355 jint flags = stream->get_u2_fast() & recognized_modifiers;
6356
6357 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6358 // Set abstract bit for old class files for backward compatibility
6359 flags |= JVM_ACC_ABSTRACT;
6360 }
6361
6362 verify_legal_class_modifiers(flags, CHECK);
6363
6364 short bad_constant = class_bad_constant_seen();
6365 if (bad_constant != 0) {
6366 // Do not throw CFE until after the access_flags are checked because if
6367 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6368 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6369 }
6370
6371 _access_flags.set_flags(flags);
6372
6373 // This class and superclass
6374 _this_class_index = stream->get_u2_fast();
6375 check_property(
6376 valid_cp_range(_this_class_index, cp_size) &&
6377 cp->tag_at(_this_class_index).is_unresolved_klass(),
6378 "Invalid this class index %u in constant pool in class file %s",
6379 _this_class_index, CHECK);
6380
6381 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6382 assert(class_name_in_cp != NULL, "class_name can't be null");
6383
6384 // Update _class_name to reflect the name in the constant pool
6385 update_class_name(class_name_in_cp);
6386
6387 // Don't need to check whether this class name is legal or not.
6388 // It has been checked when constant pool is parsed.
6389 // However, make sure it is not an array type.
6390 if (_need_verify) {
6391 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6392 "Bad class name in class file %s",
6393 CHECK);
6394 }
6395
6396 // Checks if name in class file matches requested name
6397 if (_requested_name != NULL && _requested_name != _class_name) {
6398 ResourceMark rm(THREAD);
6399 Exceptions::fthrow(
6400 THREAD_AND_LOCATION,
6401 vmSymbols::java_lang_NoClassDefFoundError(),
6402 "%s (wrong name: %s)",
6403 _class_name->as_C_string(),
6404 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6405 );
6406 return;
6407 }
6408
6409 // if this is an anonymous class fix up its name if it's in the unnamed
6410 // package. Otherwise, throw IAE if it is in a different package than
6411 // its host class.
6412 if (_unsafe_anonymous_host != NULL) {
6413 fix_unsafe_anonymous_class_name(CHECK);
6414 }
6415
6416 // Verification prevents us from creating names with dots in them, this
6417 // asserts that that's the case.
6418 assert(is_internal_format(_class_name), "external class name format used internally");
6419
6420 if (!is_internal()) {
6421 LogTarget(Debug, class, preorder) lt;
6422 if (lt.is_enabled()){
6423 ResourceMark rm(THREAD);
6424 LogStream ls(lt);
6425 ls.print("%s", _class_name->as_klass_external_name());
6426 if (stream->source() != NULL) {
6427 ls.print(" source: %s", stream->source());
6428 }
6429 ls.cr();
6430 }
6431
6432 #if INCLUDE_CDS
6433 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6434 if (!ClassLoader::has_jrt_entry()) {
6435 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6436 DumpLoadedClassList = NULL;
6437 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6438 _unsafe_anonymous_host == NULL) {
6439 // Only dump the classes that can be stored into CDS archive.
6440 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6441 oop class_loader = _loader_data->class_loader();
6442 ResourceMark rm(THREAD);
6443 bool skip = false;
6444 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6445 // For the boot and platform class loaders, skip classes that are not found in the
6446 // java runtime image, such as those found in the --patch-module entries.
6447 // These classes can't be loaded from the archive during runtime.
6448 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6449 skip = true;
6450 }
6451
6452 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6453 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6454 // as they can be loaded from the archive during runtime.
6455 skip = false;
6456 }
6457 }
6458 if (skip) {
6459 tty->print_cr("skip writing class %s from source %s to classlist file",
6460 _class_name->as_C_string(), stream->source());
6461 } else {
6462 classlist_file->print_cr("%s", _class_name->as_C_string());
6463 classlist_file->flush();
6464 }
6465 }
6466 }
6467 #endif
6468 }
6469
6470 // SUPERKLASS
6471 _super_class_index = stream->get_u2_fast();
6472 _super_klass = parse_super_class(cp,
6473 _super_class_index,
6474 _need_verify,
6475 CHECK);
6476
6477 // Interfaces
6478 _itfs_len = stream->get_u2_fast();
6479 parse_interfaces(stream,
6480 _itfs_len,
6481 cp,
6482 &_has_nonstatic_concrete_methods,
6483 CHECK);
6484
6485 assert(_local_interfaces != NULL, "invariant");
6486
6487 // Fields (offsets are filled in later)
6488 _fac = new FieldAllocationCount();
6489 parse_fields(stream,
6490 _access_flags.is_interface(),
6491 _access_flags.is_value_type(),
6492 _fac,
6493 cp,
6494 cp_size,
6495 &_java_fields_count,
6496 CHECK);
6497
6498 assert(_fields != NULL, "invariant");
6499
6500 // Methods
6501 AccessFlags promoted_flags;
6502 parse_methods(stream,
6503 _access_flags.is_interface(),
6504 _access_flags.is_value_type(),
6505 &promoted_flags,
6506 &_has_final_method,
6507 &_declares_nonstatic_concrete_methods,
6508 CHECK);
6509
6510 assert(_methods != NULL, "invariant");
6511
6512 // promote flags from parse_methods() to the klass' flags
6513 _access_flags.add_promoted_flags(promoted_flags.as_int());
6514
6515 if (_declares_nonstatic_concrete_methods) {
6516 _has_nonstatic_concrete_methods = true;
6517 }
6518
6519 // Additional attributes/annotations
6520 _parsed_annotations = new ClassAnnotationCollector();
6521 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6522
6523 assert(_inner_classes != NULL, "invariant");
6524
6525 // Finalize the Annotations metadata object,
6526 // now that all annotation arrays have been created.
6527 create_combined_annotations(CHECK);
6528
6529 // Make sure this is the end of class file stream
6530 guarantee_property(stream->at_eos(),
6531 "Extra bytes at the end of class file %s",
6532 CHECK);
6533
6534 // all bytes in stream read and parsed
6535 }
6536
6537 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6538 ConstantPool* cp,
6539 TRAPS) {
6540 assert(stream != NULL, "invariant");
6541 assert(stream->at_eos(), "invariant");
6542 assert(cp != NULL, "invariant");
6543 assert(_loader_data != NULL, "invariant");
6544
6545 if (_class_name == vmSymbols::java_lang_Object()) {
6546 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6547 "java.lang.Object cannot implement an interface in class file %s",
6548 CHECK);
6549 }
6550 // We check super class after class file is parsed and format is checked
6551 if (_super_class_index > 0 && NULL ==_super_klass) {
6552 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6553 if (_access_flags.is_interface()) {
6554 // Before attempting to resolve the superclass, check for class format
6555 // errors not checked yet.
6556 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6557 "Interfaces must have java.lang.Object as superclass in class file %s",
6558 CHECK);
6559 }
6560 Handle loader(THREAD, _loader_data->class_loader());
6561 _super_klass = (const InstanceKlass*)
6562 SystemDictionary::resolve_super_or_fail(_class_name,
6563 super_class_name,
6564 loader,
6565 _protection_domain,
6566 true,
6567 CHECK);
6568 }
6569
6570 if (_super_klass != NULL) {
6571 if (_super_klass->has_nonstatic_concrete_methods()) {
6572 _has_nonstatic_concrete_methods = true;
6573 }
6574
6575 if (_super_klass->is_interface()) {
6576 ResourceMark rm(THREAD);
6577 Exceptions::fthrow(
6578 THREAD_AND_LOCATION,
6579 vmSymbols::java_lang_IncompatibleClassChangeError(),
6580 "class %s has interface %s as super class",
6581 _class_name->as_klass_external_name(),
6582 _super_klass->external_name()
6583 );
6584 return;
6585 }
6586
6587 // For a value class, only java/lang/Object is an acceptable super class
6588 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6589 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6590 "Value type must have java.lang.Object as superclass in class file %s",
6591 CHECK);
6592 }
6593
6594 // Make sure super class is not final
6595 if (_super_klass->is_final()) {
6596 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6597 }
6598 }
6599
6600 // Compute the transitive list of all unique interfaces implemented by this class
6601 _transitive_interfaces =
6602 compute_transitive_interfaces(_super_klass,
6603 _local_interfaces,
6604 _loader_data,
6605 CHECK);
6606
6607 assert(_transitive_interfaces != NULL, "invariant");
6608
6609 // sort methods
6610 _method_ordering = sort_methods(_methods);
6611
6612 _all_mirandas = new GrowableArray<Method*>(20);
6613
6614 Handle loader(THREAD, _loader_data->class_loader());
6615 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6616 &_num_miranda_methods,
6617 _all_mirandas,
6618 _super_klass,
6619 _methods,
6620 _access_flags,
6621 _major_version,
6622 loader,
6623 _class_name,
6624 _local_interfaces,
6625 CHECK);
6626
6627 // Size of Java itable (in words)
6628 _itable_size = _access_flags.is_interface() ? 0 :
6629 klassItable::compute_itable_size(_transitive_interfaces);
6630
6631 assert(_fac != NULL, "invariant");
6632 assert(_parsed_annotations != NULL, "invariant");
6633
6634
6635 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6636 if (fs.is_flattenable()) {
6637 // Pre-load value class
6638 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6639 Handle(THREAD, _loader_data->class_loader()),
6640 _protection_domain, true, CHECK);
6641 assert(klass != NULL, "Sanity check");
6642 assert(klass->access_flags().is_value_type(), "Value type expected");
6643 _has_flattenable_fields = true;
6644 }
6645 }
6646
6647 _field_info = new FieldLayoutInfo();
6648 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6649
6650 // Compute reference typ
6651 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6652
6653 }
6654
6655 void ClassFileParser::set_klass(InstanceKlass* klass) {
6656
6657 #ifdef ASSERT
6658 if (klass != NULL) {
6659 assert(NULL == _klass, "leaking?");
6660 }
6661 #endif
6662
6663 _klass = klass;
6664 }
6665
6666 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6667
6668 #ifdef ASSERT
6669 if (klass != NULL) {
6670 assert(NULL == _klass_to_deallocate, "leaking?");
6671 }
6672 #endif
6673
6674 _klass_to_deallocate = klass;
6675 }
6676
6677 // Caller responsible for ResourceMark
6678 // clone stream with rewound position
6679 const ClassFileStream* ClassFileParser::clone_stream() const {
6680 assert(_stream != NULL, "invariant");
6681
6682 return _stream->clone();
6683 }
6684
6685 // ----------------------------------------------------------------------------
6686 // debugging
6687
6688 #ifdef ASSERT
6689
6690 // return true if class_name contains no '.' (internal format is '/')
6691 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6692 if (class_name != NULL) {
6693 ResourceMark rm;
6694 char* name = class_name->as_C_string();
6695 return strchr(name, '.') == NULL;
6696 } else {
6697 return true;
6698 }
6699 }
6700
6701 #endif