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
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/dictionary.hpp"
34 #include <classfile/fieldLayoutBuilder.hpp>
35 #include "classfile/javaClasses.inline.hpp"
36 #include "classfile/moduleEntry.hpp"
37 #include "classfile/packageEntry.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/verificationType.hpp"
41 #include "classfile/verifier.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldStreams.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/klassVtable.hpp"
57 #include "oops/metadata.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/symbol.hpp"
61 #include "oops/valueKlass.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/jvmtiThreadState.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/os.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/reflection.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/signature.hpp"
73 #include "runtime/timer.hpp"
74 #include "services/classLoadingService.hpp"
75 #include "services/threadService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/bitMap.inline.hpp"
78 #include "utilities/copy.hpp"
79 #include "utilities/exceptions.hpp"
80 #include "utilities/globalDefinitions.hpp"
81 #include "utilities/growableArray.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/resourceHash.hpp"
85 #include "utilities/utf8.hpp"
86
87 #if INCLUDE_CDS
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90 #if INCLUDE_JFR
91 #include "jfr/support/jfrTraceIdExtension.hpp"
92 #endif
93
94 // We generally try to create the oops directly when parsing, rather than
95 // allocating temporary data structures and copying the bytes twice. A
96 // temporary area is only needed when parsing utf8 entries in the constant
97 // pool and when parsing line number tables.
98
99 // We add assert in debug mode when class format is not checked.
100
101 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
102 #define JAVA_MIN_SUPPORTED_VERSION 45
103 #define JAVA_PREVIEW_MINOR_VERSION 65535
104
105 // Used for two backward compatibility reasons:
106 // - to check for new additions to the class file format in JDK1.5
107 // - to check for bug fixes in the format checker in JDK1.5
108 #define JAVA_1_5_VERSION 49
109
110 // Used for backward compatibility reasons:
111 // - to check for javac bug fixes that happened after 1.5
112 // - also used as the max version when running in jdk6
113 #define JAVA_6_VERSION 50
114
115 // Used for backward compatibility reasons:
116 // - to disallow argument and require ACC_STATIC for <clinit> methods
117 #define JAVA_7_VERSION 51
118
119 // Extension method support.
120 #define JAVA_8_VERSION 52
121
122 #define JAVA_9_VERSION 53
123
124 #define JAVA_10_VERSION 54
125
126 #define JAVA_11_VERSION 55
127
128 #define JAVA_12_VERSION 56
129
130 #define JAVA_13_VERSION 57
131
132 #define JAVA_14_VERSION 58
133
134 #define CONSTANT_CLASS_DESCRIPTORS 58
135
136 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
137 assert((bad_constant == JVM_CONSTANT_Module ||
138 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
139 "Unexpected bad constant pool entry");
140 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
141 }
142
143 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
144 ConstantPool* cp,
145 const int length,
146 TRAPS) {
147 assert(stream != NULL, "invariant");
148 assert(cp != NULL, "invariant");
149
150 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
151 // this function (_current can be allocated in a register, with scalar
152 // replacement of aggregates). The _current pointer is copied back to
153 // stream() when this function returns. DON'T call another method within
154 // this method that uses stream().
155 const ClassFileStream cfs1 = *stream;
156 const ClassFileStream* const cfs = &cfs1;
157
158 assert(cfs->allocated_on_stack(), "should be local");
159 debug_only(const u1* const old_current = stream->current();)
160
161 // Used for batching symbol allocations.
162 const char* names[SymbolTable::symbol_alloc_batch_size];
163 int lengths[SymbolTable::symbol_alloc_batch_size];
164 int indices[SymbolTable::symbol_alloc_batch_size];
165 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
166 int names_count = 0;
167
168 // parsing Index 0 is unused
169 for (int index = 1; index < length; index++) {
170 // Each of the following case guarantees one more byte in the stream
171 // for the following tag or the access_flags following constant pool,
172 // so we don't need bounds-check for reading tag.
173 const u1 tag = cfs->get_u1_fast();
174 switch (tag) {
175 case JVM_CONSTANT_Class: {
176 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
177 const u2 name_index = cfs->get_u2_fast();
178 cp->klass_index_at_put(index, name_index);
179 break;
180 }
181 case JVM_CONSTANT_Fieldref: {
182 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
183 const u2 class_index = cfs->get_u2_fast();
184 const u2 name_and_type_index = cfs->get_u2_fast();
185 cp->field_at_put(index, class_index, name_and_type_index);
186 break;
187 }
188 case JVM_CONSTANT_Methodref: {
189 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
190 const u2 class_index = cfs->get_u2_fast();
191 const u2 name_and_type_index = cfs->get_u2_fast();
192 cp->method_at_put(index, class_index, name_and_type_index);
193 break;
194 }
195 case JVM_CONSTANT_InterfaceMethodref: {
196 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
197 const u2 class_index = cfs->get_u2_fast();
198 const u2 name_and_type_index = cfs->get_u2_fast();
199 cp->interface_method_at_put(index, class_index, name_and_type_index);
200 break;
201 }
202 case JVM_CONSTANT_String : {
203 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
204 const u2 string_index = cfs->get_u2_fast();
205 cp->string_index_at_put(index, string_index);
206 break;
207 }
208 case JVM_CONSTANT_MethodHandle :
209 case JVM_CONSTANT_MethodType: {
210 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
211 classfile_parse_error(
212 "Class file version does not support constant tag %u in class file %s",
213 tag, CHECK);
214 }
215 if (tag == JVM_CONSTANT_MethodHandle) {
216 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
217 const u1 ref_kind = cfs->get_u1_fast();
218 const u2 method_index = cfs->get_u2_fast();
219 cp->method_handle_index_at_put(index, ref_kind, method_index);
220 }
221 else if (tag == JVM_CONSTANT_MethodType) {
222 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
223 const u2 signature_index = cfs->get_u2_fast();
224 cp->method_type_index_at_put(index, signature_index);
225 }
226 else {
227 ShouldNotReachHere();
228 }
229 break;
230 }
231 case JVM_CONSTANT_Dynamic : {
232 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
233 classfile_parse_error(
234 "Class file version does not support constant tag %u in class file %s",
235 tag, CHECK);
236 }
237 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
238 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
239 const u2 name_and_type_index = cfs->get_u2_fast();
240 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
241 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
242 }
243 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
244 break;
245 }
246 case JVM_CONSTANT_InvokeDynamic : {
247 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
248 classfile_parse_error(
249 "Class file version does not support constant tag %u in class file %s",
250 tag, CHECK);
251 }
252 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
253 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
254 const u2 name_and_type_index = cfs->get_u2_fast();
255 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
256 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
257 }
258 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
259 break;
260 }
261 case JVM_CONSTANT_Integer: {
262 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
263 const u4 bytes = cfs->get_u4_fast();
264 cp->int_at_put(index, (jint)bytes);
265 break;
266 }
267 case JVM_CONSTANT_Float: {
268 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
269 const u4 bytes = cfs->get_u4_fast();
270 cp->float_at_put(index, *(jfloat*)&bytes);
271 break;
272 }
273 case JVM_CONSTANT_Long: {
274 // A mangled type might cause you to overrun allocated memory
275 guarantee_property(index + 1 < length,
276 "Invalid constant pool entry %u in class file %s",
277 index,
278 CHECK);
279 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
280 const u8 bytes = cfs->get_u8_fast();
281 cp->long_at_put(index, bytes);
282 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
283 break;
284 }
285 case JVM_CONSTANT_Double: {
286 // A mangled type might cause you to overrun allocated memory
287 guarantee_property(index+1 < length,
288 "Invalid constant pool entry %u in class file %s",
289 index,
290 CHECK);
291 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
292 const u8 bytes = cfs->get_u8_fast();
293 cp->double_at_put(index, *(jdouble*)&bytes);
294 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
295 break;
296 }
297 case JVM_CONSTANT_NameAndType: {
298 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
299 const u2 name_index = cfs->get_u2_fast();
300 const u2 signature_index = cfs->get_u2_fast();
301 cp->name_and_type_at_put(index, name_index, signature_index);
302 break;
303 }
304 case JVM_CONSTANT_Utf8 : {
305 cfs->guarantee_more(2, CHECK); // utf8_length
306 u2 utf8_length = cfs->get_u2_fast();
307 const u1* utf8_buffer = cfs->current();
308 assert(utf8_buffer != NULL, "null utf8 buffer");
309 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
310 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
311 cfs->skip_u1_fast(utf8_length);
312
313 // Before storing the symbol, make sure it's legal
314 if (_need_verify) {
315 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
316 }
317
318 if (has_cp_patch_at(index)) {
319 Handle patch = clear_cp_patch_at(index);
320 guarantee_property(java_lang_String::is_instance(patch()),
321 "Illegal utf8 patch at %d in class file %s",
322 index,
323 CHECK);
324 const char* const str = java_lang_String::as_utf8_string(patch());
325 // (could use java_lang_String::as_symbol instead, but might as well batch them)
326 utf8_buffer = (const u1*) str;
327 utf8_length = (u2) strlen(str);
328 }
329
330 unsigned int hash;
331 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
332 utf8_length,
333 hash);
334 if (result == NULL) {
335 names[names_count] = (const char*)utf8_buffer;
336 lengths[names_count] = utf8_length;
337 indices[names_count] = index;
338 hashValues[names_count++] = hash;
339 if (names_count == SymbolTable::symbol_alloc_batch_size) {
340 SymbolTable::new_symbols(_loader_data,
341 cp,
342 names_count,
343 names,
344 lengths,
345 indices,
346 hashValues);
347 names_count = 0;
348 }
349 } else {
350 cp->symbol_at_put(index, result);
351 }
352 break;
353 }
354 case JVM_CONSTANT_Module:
355 case JVM_CONSTANT_Package: {
356 // Record that an error occurred in these two cases but keep parsing so
357 // that ACC_Module can be checked for in the access_flags. Need to
358 // throw NoClassDefFoundError in that case.
359 if (_major_version >= JAVA_9_VERSION) {
360 cfs->guarantee_more(3, CHECK);
361 cfs->get_u2_fast();
362 set_class_bad_constant_seen(tag);
363 break;
364 }
365 }
366 default: {
367 classfile_parse_error("Unknown constant tag %u in class file %s",
368 tag,
369 CHECK);
370 break;
371 }
372 } // end of switch(tag)
373 } // end of for
374
375 // Allocate the remaining symbols
376 if (names_count > 0) {
377 SymbolTable::new_symbols(_loader_data,
378 cp,
379 names_count,
380 names,
381 lengths,
382 indices,
383 hashValues);
384 }
385
386 // Copy _current pointer of local copy back to stream.
387 assert(stream->current() == old_current, "non-exclusive use of stream");
388 stream->set_current(cfs1.current());
389
390 }
391
392 static inline bool valid_cp_range(int index, int length) {
393 return (index > 0 && index < length);
394 }
395
396 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
397 assert(cp != NULL, "invariant");
398 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
399 return cp->symbol_at(index);
400 }
401 return NULL;
402 }
403
404 #ifdef ASSERT
405 PRAGMA_DIAG_PUSH
406 PRAGMA_FORMAT_NONLITERAL_IGNORED
407 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
408 ResourceMark rm(THREAD);
409 fatal(msg, _class_name->as_C_string());
410 }
411
412 void ClassFileParser::report_assert_property_failure(const char* msg,
413 int index,
414 TRAPS) const {
415 ResourceMark rm(THREAD);
416 fatal(msg, index, _class_name->as_C_string());
417 }
418 PRAGMA_DIAG_POP
419 #endif
420
421 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
422 ConstantPool* const cp,
423 const int length,
424 TRAPS) {
425 assert(cp != NULL, "invariant");
426 assert(stream != NULL, "invariant");
427
428 // parsing constant pool entries
429 parse_constant_pool_entries(stream, cp, length, CHECK);
430 if (class_bad_constant_seen() != 0) {
431 // a bad CP entry has been detected previously so stop parsing and just return.
432 return;
433 }
434
435 int index = 1; // declared outside of loops for portability
436 int num_klasses = 0;
437
438 // first verification pass - validate cross references
439 // and fixup class and string constants
440 for (index = 1; index < length; index++) { // Index 0 is unused
441 const jbyte tag = cp->tag_at(index).value();
442 switch (tag) {
443 case JVM_CONSTANT_Class: {
444 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
445 break;
446 }
447 case JVM_CONSTANT_Fieldref:
448 // fall through
449 case JVM_CONSTANT_Methodref:
450 // fall through
451 case JVM_CONSTANT_InterfaceMethodref: {
452 if (!_need_verify) break;
453 const int klass_ref_index = cp->klass_ref_index_at(index);
454 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
455 check_property(valid_klass_reference_at(klass_ref_index),
456 "Invalid constant pool index %u in class file %s",
457 klass_ref_index, CHECK);
458 check_property(valid_cp_range(name_and_type_ref_index, length) &&
459 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
460 "Invalid constant pool index %u in class file %s",
461 name_and_type_ref_index, CHECK);
462 break;
463 }
464 case JVM_CONSTANT_String: {
465 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
466 break;
467 }
468 case JVM_CONSTANT_Integer:
469 break;
470 case JVM_CONSTANT_Float:
471 break;
472 case JVM_CONSTANT_Long:
473 case JVM_CONSTANT_Double: {
474 index++;
475 check_property(
476 (index < length && cp->tag_at(index).is_invalid()),
477 "Improper constant pool long/double index %u in class file %s",
478 index, CHECK);
479 break;
480 }
481 case JVM_CONSTANT_NameAndType: {
482 if (!_need_verify) break;
483 const int name_ref_index = cp->name_ref_index_at(index);
484 const int signature_ref_index = cp->signature_ref_index_at(index);
485 check_property(valid_symbol_at(name_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 name_ref_index, CHECK);
488 check_property(valid_symbol_at(signature_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 signature_ref_index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_Utf8:
494 break;
495 case JVM_CONSTANT_UnresolvedClass: // fall-through
496 case JVM_CONSTANT_UnresolvedClassInError: {
497 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
498 break;
499 }
500 case JVM_CONSTANT_ClassIndex: {
501 const int class_index = cp->klass_index_at(index);
502 check_property(valid_symbol_at(class_index),
503 "Invalid constant pool index %u in class file %s",
504 class_index, CHECK);
505
506 Symbol* const name = cp->symbol_at(class_index);
507 const unsigned int name_len = name->utf8_length();
508 if (name->is_Q_signature()) {
509 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
510 } else {
511 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
512 }
513 break;
514 }
515 case JVM_CONSTANT_StringIndex: {
516 const int string_index = cp->string_index_at(index);
517 check_property(valid_symbol_at(string_index),
518 "Invalid constant pool index %u in class file %s",
519 string_index, CHECK);
520 Symbol* const sym = cp->symbol_at(string_index);
521 cp->unresolved_string_at_put(index, sym);
522 break;
523 }
524 case JVM_CONSTANT_MethodHandle: {
525 const int ref_index = cp->method_handle_index_at(index);
526 check_property(valid_cp_range(ref_index, length),
527 "Invalid constant pool index %u in class file %s",
528 ref_index, CHECK);
529 const constantTag tag = cp->tag_at(ref_index);
530 const int ref_kind = cp->method_handle_ref_kind_at(index);
531
532 switch (ref_kind) {
533 case JVM_REF_getField:
534 case JVM_REF_getStatic:
535 case JVM_REF_putField:
536 case JVM_REF_putStatic: {
537 check_property(
538 tag.is_field(),
539 "Invalid constant pool index %u in class file %s (not a field)",
540 ref_index, CHECK);
541 break;
542 }
543 case JVM_REF_invokeVirtual:
544 case JVM_REF_newInvokeSpecial: {
545 check_property(
546 tag.is_method(),
547 "Invalid constant pool index %u in class file %s (not a method)",
548 ref_index, CHECK);
549 break;
550 }
551 case JVM_REF_invokeStatic:
552 case JVM_REF_invokeSpecial: {
553 check_property(
554 tag.is_method() ||
555 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
556 "Invalid constant pool index %u in class file %s (not a method)",
557 ref_index, CHECK);
558 break;
559 }
560 case JVM_REF_invokeInterface: {
561 check_property(
562 tag.is_interface_method(),
563 "Invalid constant pool index %u in class file %s (not an interface method)",
564 ref_index, CHECK);
565 break;
566 }
567 default: {
568 classfile_parse_error(
569 "Bad method handle kind at constant pool index %u in class file %s",
570 index, CHECK);
571 }
572 } // switch(refkind)
573 // Keep the ref_index unchanged. It will be indirected at link-time.
574 break;
575 } // case MethodHandle
576 case JVM_CONSTANT_MethodType: {
577 const int ref_index = cp->method_type_index_at(index);
578 check_property(valid_symbol_at(ref_index),
579 "Invalid constant pool index %u in class file %s",
580 ref_index, CHECK);
581 break;
582 }
583 case JVM_CONSTANT_Dynamic: {
584 const int name_and_type_ref_index =
585 cp->bootstrap_name_and_type_ref_index_at(index);
586
587 check_property(valid_cp_range(name_and_type_ref_index, length) &&
588 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
589 "Invalid constant pool index %u in class file %s",
590 name_and_type_ref_index, CHECK);
591 // bootstrap specifier index must be checked later,
592 // when BootstrapMethods attr is available
593
594 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
595 cp->set_has_dynamic_constant();
596 break;
597 }
598 case JVM_CONSTANT_InvokeDynamic: {
599 const int name_and_type_ref_index =
600 cp->bootstrap_name_and_type_ref_index_at(index);
601
602 check_property(valid_cp_range(name_and_type_ref_index, length) &&
603 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
604 "Invalid constant pool index %u in class file %s",
605 name_and_type_ref_index, CHECK);
606 // bootstrap specifier index must be checked later,
607 // when BootstrapMethods attr is available
608 break;
609 }
610 default: {
611 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
612 ShouldNotReachHere();
613 break;
614 }
615 } // switch(tag)
616 } // end of for
617
618 _first_patched_klass_resolved_index = num_klasses;
619 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
620
621 if (_cp_patches != NULL) {
622 // need to treat this_class specially...
623
624 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
625 // for now. These will be replaced with actual names of the patched classes in patch_class().
626 Symbol* s = vmSymbols::star_name();
627 for (int n=_orig_cp_size; n<cp->length(); n++) {
628 cp->symbol_at_put(n, s);
629 }
630
631 int this_class_index;
632 {
633 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
634 const u1* const mark = stream->current();
635 stream->skip_u2_fast(1); // skip flags
636 this_class_index = stream->get_u2_fast();
637 stream->set_current(mark); // revert to mark
638 }
639
640 for (index = 1; index < length; index++) { // Index 0 is unused
641 if (has_cp_patch_at(index)) {
642 guarantee_property(index != this_class_index,
643 "Illegal constant pool patch to self at %d in class file %s",
644 index, CHECK);
645 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
646 }
647 }
648 }
649
650 if (!_need_verify) {
651 return;
652 }
653
654 // second verification pass - checks the strings are of the right format.
655 // but not yet to the other entries
656 for (index = 1; index < length; index++) {
657 const jbyte tag = cp->tag_at(index).value();
658 switch (tag) {
659 case JVM_CONSTANT_UnresolvedClass: {
660 const Symbol* const class_name = cp->klass_name_at(index);
661 // check the name, even if _cp_patches will overwrite it
662 verify_legal_class_name(class_name, CHECK);
663 break;
664 }
665 case JVM_CONSTANT_NameAndType: {
666 if (_need_verify) {
667 const int sig_index = cp->signature_ref_index_at(index);
668 const int name_index = cp->name_ref_index_at(index);
669 const Symbol* const name = cp->symbol_at(name_index);
670 const Symbol* const sig = cp->symbol_at(sig_index);
671 guarantee_property(sig->utf8_length() != 0,
672 "Illegal zero length constant pool entry at %d in class %s",
673 sig_index, CHECK);
674 guarantee_property(name->utf8_length() != 0,
675 "Illegal zero length constant pool entry at %d in class %s",
676 name_index, CHECK);
677
678 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
679 // Format check method name and signature
680 verify_legal_method_name(name, CHECK);
681 verify_legal_method_signature(name, sig, CHECK);
682 } else {
683 // Format check field name and signature
684 verify_legal_field_name(name, CHECK);
685 verify_legal_field_signature(name, sig, CHECK);
686 }
687 }
688 break;
689 }
690 case JVM_CONSTANT_Dynamic: {
691 const int name_and_type_ref_index =
692 cp->name_and_type_ref_index_at(index);
693 // already verified to be utf8
694 const int name_ref_index =
695 cp->name_ref_index_at(name_and_type_ref_index);
696 // already verified to be utf8
697 const int signature_ref_index =
698 cp->signature_ref_index_at(name_and_type_ref_index);
699 const Symbol* const name = cp->symbol_at(name_ref_index);
700 const Symbol* const signature = cp->symbol_at(signature_ref_index);
701 if (_need_verify) {
702 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
703 // Need only to be sure signature is non-zero length and the right type.
704 if (signature->utf8_length() == 0 ||
705 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
706 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
707 }
708 }
709 break;
710 }
711 case JVM_CONSTANT_InvokeDynamic:
712 case JVM_CONSTANT_Fieldref:
713 case JVM_CONSTANT_Methodref:
714 case JVM_CONSTANT_InterfaceMethodref: {
715 const int name_and_type_ref_index =
716 cp->name_and_type_ref_index_at(index);
717 // already verified to be utf8
718 const int name_ref_index =
719 cp->name_ref_index_at(name_and_type_ref_index);
720 // already verified to be utf8
721 const int signature_ref_index =
722 cp->signature_ref_index_at(name_and_type_ref_index);
723 const Symbol* const name = cp->symbol_at(name_ref_index);
724 const Symbol* const signature = cp->symbol_at(signature_ref_index);
725 if (tag == JVM_CONSTANT_Fieldref) {
726 if (_need_verify) {
727 // Field name and signature are verified above, when iterating NameAndType_info.
728 // Need only to be sure signature is non-zero length and the right type.
729 if (signature->utf8_length() == 0 ||
730 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
731 throwIllegalSignature("Field", name, signature, CHECK);
732 }
733 }
734 } else {
735 if (_need_verify) {
736 // Method name and signature are verified above, when iterating NameAndType_info.
737 // Need only to be sure signature is non-zero length and the right type.
738 if (signature->utf8_length() == 0 ||
739 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
740 throwIllegalSignature("Method", name, signature, CHECK);
741 }
742 }
743 // 4509014: If a class method name begins with '<', it must be "<init>"
744 const unsigned int name_len = name->utf8_length();
745 if (tag == JVM_CONSTANT_Methodref &&
746 name_len != 0 &&
747 name->char_at(0) == '<' &&
748 name != vmSymbols::object_initializer_name()) {
749 classfile_parse_error(
750 "Bad method name at constant pool index %u in class file %s",
751 name_ref_index, CHECK);
752 }
753 }
754 break;
755 }
756 case JVM_CONSTANT_MethodHandle: {
757 const int ref_index = cp->method_handle_index_at(index);
758 const int ref_kind = cp->method_handle_ref_kind_at(index);
759 switch (ref_kind) {
760 case JVM_REF_invokeVirtual:
761 case JVM_REF_invokeStatic:
762 case JVM_REF_invokeSpecial:
763 case JVM_REF_newInvokeSpecial: {
764 const int name_and_type_ref_index =
765 cp->name_and_type_ref_index_at(ref_index);
766 const int name_ref_index =
767 cp->name_ref_index_at(name_and_type_ref_index);
768 const Symbol* const name = cp->symbol_at(name_ref_index);
769 if (name != vmSymbols::object_initializer_name()) {
770 if (ref_kind == JVM_REF_newInvokeSpecial) {
771 classfile_parse_error(
772 "Bad constructor name at constant pool index %u in class file %s",
773 name_ref_index, CHECK);
774 }
775 } else {
776 // The allowed invocation mode of <init> depends on its signature.
777 // This test corresponds to verify_invoke_instructions in the verifier.
778 const int signature_ref_index =
779 cp->signature_ref_index_at(name_and_type_ref_index);
780 const Symbol* const signature = cp->symbol_at(signature_ref_index);
781 if (signature->is_void_method_signature()
782 && ref_kind == JVM_REF_newInvokeSpecial) {
783 // OK, could be a constructor call
784 } else if (!signature->is_void_method_signature()
785 && ref_kind == JVM_REF_invokeStatic) {
786 // also OK, could be a static factory call
787 } else {
788 classfile_parse_error(
789 "Bad method name at constant pool index %u in class file %s",
790 name_ref_index, CHECK);
791 }
792 }
793 break;
794 }
795 // Other ref_kinds are already fully checked in previous pass.
796 } // switch(ref_kind)
797 break;
798 }
799 case JVM_CONSTANT_MethodType: {
800 const Symbol* const no_name = vmSymbols::type_name(); // place holder
801 const Symbol* const signature = cp->method_type_signature_at(index);
802 verify_legal_method_signature(no_name, signature, CHECK);
803 break;
804 }
805 case JVM_CONSTANT_Utf8: {
806 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
807 }
808 } // switch(tag)
809 } // end of for
810 }
811
812 Handle ClassFileParser::clear_cp_patch_at(int index) {
813 Handle patch = cp_patch_at(index);
814 _cp_patches->at_put(index, Handle());
815 assert(!has_cp_patch_at(index), "");
816 return patch;
817 }
818
819 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
820 int name_index = _orig_cp_size + _num_patched_klasses;
821 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
822
823 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
824 _num_patched_klasses ++;
825 }
826
827 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
828 int index,
829 Handle patch,
830 TRAPS) {
831 assert(cp != NULL, "invariant");
832
833 BasicType patch_type = T_VOID;
834
835 switch (cp->tag_at(index).value()) {
836
837 case JVM_CONSTANT_UnresolvedClass: {
838 // Patching a class means pre-resolving it.
839 // The name in the constant pool is ignored.
840 if (java_lang_Class::is_instance(patch())) {
841 guarantee_property(!java_lang_Class::is_primitive(patch()),
842 "Illegal class patch at %d in class file %s",
843 index, CHECK);
844 Klass* k = java_lang_Class::as_Klass(patch());
845 patch_class(cp, index, k, k->name());
846 } else {
847 guarantee_property(java_lang_String::is_instance(patch()),
848 "Illegal class patch at %d in class file %s",
849 index, CHECK);
850 Symbol* const name = java_lang_String::as_symbol(patch());
851 patch_class(cp, index, NULL, name);
852 }
853 break;
854 }
855
856 case JVM_CONSTANT_String: {
857 // skip this patch and don't clear it. Needs the oop array for resolved
858 // references to be created first.
859 return;
860 }
861 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
862 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
863 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
864 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
865 patch_prim:
866 {
867 jvalue value;
868 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
869 guarantee_property(value_type == patch_type,
870 "Illegal primitive patch at %d in class file %s",
871 index, CHECK);
872 switch (value_type) {
873 case T_INT: cp->int_at_put(index, value.i); break;
874 case T_FLOAT: cp->float_at_put(index, value.f); break;
875 case T_LONG: cp->long_at_put(index, value.j); break;
876 case T_DOUBLE: cp->double_at_put(index, value.d); break;
877 default: assert(false, "");
878 }
879 } // end patch_prim label
880 break;
881
882 default: {
883 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
884 guarantee_property(!has_cp_patch_at(index),
885 "Illegal unexpected patch at %d in class file %s",
886 index, CHECK);
887 return;
888 }
889 } // end of switch(tag)
890
891 // On fall-through, mark the patch as used.
892 clear_cp_patch_at(index);
893 }
894 class NameSigHash: public ResourceObj {
895 public:
896 const Symbol* _name; // name
897 const Symbol* _sig; // signature
898 NameSigHash* _next; // Next entry in hash table
899 };
900
901 static const int HASH_ROW_SIZE = 256;
902
903 static unsigned int hash(const Symbol* name, const Symbol* sig) {
904 unsigned int raw_hash = 0;
905 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
906 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
907
908 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
909 }
910
911
912 static void initialize_hashtable(NameSigHash** table) {
913 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
914 }
915 // Return false if the name/sig combination is found in table.
916 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
917 // The old format checker uses heap sort to find duplicates.
918 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
919 // of table since we don't expect Symbol*'s to move.
920 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
921 assert(name != NULL, "name in constant pool is NULL");
922
923 // First lookup for duplicates
924 int index = hash(name, sig);
925 NameSigHash* entry = table[index];
926 while (entry != NULL) {
927 if (entry->_name == name && entry->_sig == sig) {
928 return false;
929 }
930 entry = entry->_next;
931 }
932
933 // No duplicate is found, allocate a new entry and fill it.
934 entry = new NameSigHash();
935 entry->_name = name;
936 entry->_sig = sig;
937
938 // Insert into hash table
939 entry->_next = table[index];
940 table[index] = entry;
941
942 return true;
943 }
944
945 // Side-effects: populates the _local_interfaces field
946 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
947 const int itfs_len,
948 ConstantPool* const cp,
949 bool* const has_nonstatic_concrete_methods,
950 TRAPS) {
951 assert(stream != NULL, "invariant");
952 assert(cp != NULL, "invariant");
953 assert(has_nonstatic_concrete_methods != NULL, "invariant");
954
955 if (itfs_len == 0) {
956 _local_interfaces = Universe::the_empty_instance_klass_array();
957 } else {
958 assert(itfs_len > 0, "only called for len>0");
959 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
960
961 int index;
962 for (index = 0; index < itfs_len; index++) {
963 const u2 interface_index = stream->get_u2(CHECK);
964 Klass* interf;
965 check_property(
966 valid_klass_reference_at(interface_index),
967 "Interface name has bad constant pool index %u in class file %s",
968 interface_index, CHECK);
969 if (cp->tag_at(interface_index).is_klass()) {
970 interf = cp->resolved_klass_at(interface_index);
971 } else {
972 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
973
974 // Don't need to check legal name because it's checked when parsing constant pool.
975 // But need to make sure it's not an array type.
976 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
977 "Bad interface name in class file %s", CHECK);
978
979 // Call resolve_super so classcircularity is checked
980 interf = SystemDictionary::resolve_super_or_fail(
981 _class_name,
982 unresolved_klass,
983 Handle(THREAD, _loader_data->class_loader()),
984 _protection_domain,
985 false,
986 CHECK);
987 }
988
989 if (!interf->is_interface()) {
990 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
991 err_msg("class %s can not implement %s, because it is not an interface (%s)",
992 _class_name->as_klass_external_name(),
993 interf->external_name(),
994 interf->class_in_module_of_loader()));
995 }
996
997 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
998 *has_nonstatic_concrete_methods = true;
999 }
1000 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
1001 }
1002
1003 if (!_need_verify || itfs_len <= 1) {
1004 return;
1005 }
1006
1007 // Check if there's any duplicates in interfaces
1008 ResourceMark rm(THREAD);
1009 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1010 NameSigHash*,
1011 HASH_ROW_SIZE);
1012 initialize_hashtable(interface_names);
1013 bool dup = false;
1014 const Symbol* name = NULL;
1015 {
1016 debug_only(NoSafepointVerifier nsv;)
1017 for (index = 0; index < itfs_len; index++) {
1018 const InstanceKlass* const k = _local_interfaces->at(index);
1019 name = k->name();
1020 // If no duplicates, add (name, NULL) in hashtable interface_names.
1021 if (!put_after_lookup(name, NULL, interface_names)) {
1022 dup = true;
1023 break;
1024 }
1025 }
1026 }
1027 if (dup) {
1028 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1029 name->as_C_string(), CHECK);
1030 }
1031 }
1032 }
1033
1034 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1035 int constantvalue_index,
1036 int signature_index,
1037 TRAPS) const {
1038 // Make sure the constant pool entry is of a type appropriate to this field
1039 guarantee_property(
1040 (constantvalue_index > 0 &&
1041 constantvalue_index < cp->length()),
1042 "Bad initial value index %u in ConstantValue attribute in class file %s",
1043 constantvalue_index, CHECK);
1044
1045 const constantTag value_type = cp->tag_at(constantvalue_index);
1046 switch(cp->basic_type_for_signature_at(signature_index)) {
1047 case T_LONG: {
1048 guarantee_property(value_type.is_long(),
1049 "Inconsistent constant value type in class file %s",
1050 CHECK);
1051 break;
1052 }
1053 case T_FLOAT: {
1054 guarantee_property(value_type.is_float(),
1055 "Inconsistent constant value type in class file %s",
1056 CHECK);
1057 break;
1058 }
1059 case T_DOUBLE: {
1060 guarantee_property(value_type.is_double(),
1061 "Inconsistent constant value type in class file %s",
1062 CHECK);
1063 break;
1064 }
1065 case T_BYTE:
1066 case T_CHAR:
1067 case T_SHORT:
1068 case T_BOOLEAN:
1069 case T_INT: {
1070 guarantee_property(value_type.is_int(),
1071 "Inconsistent constant value type in class file %s",
1072 CHECK);
1073 break;
1074 }
1075 case T_OBJECT: {
1076 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1077 && value_type.is_string()),
1078 "Bad string initial value in class file %s",
1079 CHECK);
1080 break;
1081 }
1082 default: {
1083 classfile_parse_error("Unable to set initial value %u in class file %s",
1084 constantvalue_index,
1085 CHECK);
1086 }
1087 }
1088 }
1089
1090 // This class also doubles as a holder for metadata cleanup.
1091 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1092 private:
1093 ClassLoaderData* _loader_data;
1094 AnnotationArray* _field_annotations;
1095 AnnotationArray* _field_type_annotations;
1096 public:
1097 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1098 AnnotationCollector(_in_field),
1099 _loader_data(loader_data),
1100 _field_annotations(NULL),
1101 _field_type_annotations(NULL) {}
1102 ~FieldAnnotationCollector();
1103 void apply_to(FieldInfo* f);
1104 AnnotationArray* field_annotations() { return _field_annotations; }
1105 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1106
1107 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1108 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1109 };
1110
1111 class MethodAnnotationCollector : public AnnotationCollector{
1112 public:
1113 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1114 void apply_to(const methodHandle& m);
1115 };
1116
1117
1118 static int skip_annotation_value(const u1*, int, int); // fwd decl
1119
1120 // Safely increment index by val if does not pass limit
1121 #define SAFE_ADD(index, limit, val) \
1122 if (index >= limit - val) return limit; \
1123 index += val;
1124
1125 // Skip an annotation. Return >=limit if there is any problem.
1126 static int skip_annotation(const u1* buffer, int limit, int index) {
1127 assert(buffer != NULL, "invariant");
1128 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1129 // value := switch (tag:u1) { ... }
1130 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1131 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1132 while (--nmem >= 0 && index < limit) {
1133 SAFE_ADD(index, limit, 2); // skip member
1134 index = skip_annotation_value(buffer, limit, index);
1135 }
1136 return index;
1137 }
1138
1139 // Skip an annotation value. Return >=limit if there is any problem.
1140 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1141 assert(buffer != NULL, "invariant");
1142
1143 // value := switch (tag:u1) {
1144 // case B, C, I, S, Z, D, F, J, c: con:u2;
1145 // case e: e_class:u2 e_name:u2;
1146 // case s: s_con:u2;
1147 // case [: do(nval:u2) {value};
1148 // case @: annotation;
1149 // case s: s_con:u2;
1150 // }
1151 SAFE_ADD(index, limit, 1); // read tag
1152 const u1 tag = buffer[index - 1];
1153 switch (tag) {
1154 case 'B':
1155 case 'C':
1156 case 'I':
1157 case 'S':
1158 case 'Z':
1159 case 'D':
1160 case 'F':
1161 case 'J':
1162 case 'c':
1163 case 's':
1164 SAFE_ADD(index, limit, 2); // skip con or s_con
1165 break;
1166 case 'e':
1167 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1168 break;
1169 case '[':
1170 {
1171 SAFE_ADD(index, limit, 2); // read nval
1172 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1173 while (--nval >= 0 && index < limit) {
1174 index = skip_annotation_value(buffer, limit, index);
1175 }
1176 }
1177 break;
1178 case '@':
1179 index = skip_annotation(buffer, limit, index);
1180 break;
1181 default:
1182 return limit; // bad tag byte
1183 }
1184 return index;
1185 }
1186
1187 // Sift through annotations, looking for those significant to the VM:
1188 static void parse_annotations(const ConstantPool* const cp,
1189 const u1* buffer, int limit,
1190 AnnotationCollector* coll,
1191 ClassLoaderData* loader_data,
1192 TRAPS) {
1193
1194 assert(cp != NULL, "invariant");
1195 assert(buffer != NULL, "invariant");
1196 assert(coll != NULL, "invariant");
1197 assert(loader_data != NULL, "invariant");
1198
1199 // annotations := do(nann:u2) {annotation}
1200 int index = 2; // read nann
1201 if (index >= limit) return;
1202 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1203 enum { // initial annotation layout
1204 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1205 count_off = 2, // u2 such as 1 (one value)
1206 member_off = 4, // utf8 such as 'value'
1207 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1208 e_tag_val = 'e',
1209 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1210 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1211 e_size = 11, // end of 'e' annotation
1212 c_tag_val = 'c', // payload is type
1213 c_con_off = 7, // utf8 payload, such as 'I'
1214 c_size = 9, // end of 'c' annotation
1215 s_tag_val = 's', // payload is String
1216 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1217 s_size = 9,
1218 min_size = 6 // smallest possible size (zero members)
1219 };
1220 // Cannot add min_size to index in case of overflow MAX_INT
1221 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1222 int index0 = index;
1223 index = skip_annotation(buffer, limit, index);
1224 const u1* const abase = buffer + index0;
1225 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1226 const int count = Bytes::get_Java_u2((address)abase + count_off);
1227 const Symbol* const aname = check_symbol_at(cp, atype);
1228 if (aname == NULL) break; // invalid annotation name
1229 const Symbol* member = NULL;
1230 if (count >= 1) {
1231 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1232 member = check_symbol_at(cp, member_index);
1233 if (member == NULL) break; // invalid member name
1234 }
1235
1236 // Here is where parsing particular annotations will take place.
1237 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1238 if (AnnotationCollector::_unknown == id) continue;
1239 coll->set_annotation(id);
1240
1241 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1242 // @Contended can optionally specify the contention group.
1243 //
1244 // Contended group defines the equivalence class over the fields:
1245 // the fields within the same contended group are not treated distinct.
1246 // The only exception is default group, which does not incur the
1247 // equivalence. Naturally, contention group for classes is meaningless.
1248 //
1249 // While the contention group is specified as String, annotation
1250 // values are already interned, and we might as well use the constant
1251 // pool index as the group tag.
1252 //
1253 u2 group_index = 0; // default contended group
1254 if (count == 1
1255 && s_size == (index - index0) // match size
1256 && s_tag_val == *(abase + tag_off)
1257 && member == vmSymbols::value_name()) {
1258 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1259 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1260 group_index = 0; // default contended group
1261 }
1262 }
1263 coll->set_contended_group(group_index);
1264 }
1265 }
1266 }
1267
1268
1269 // Parse attributes for a field.
1270 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1271 u2 attributes_count,
1272 bool is_static, u2 signature_index,
1273 u2* const constantvalue_index_addr,
1274 bool* const is_synthetic_addr,
1275 u2* const generic_signature_index_addr,
1276 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1277 TRAPS) {
1278 assert(cfs != NULL, "invariant");
1279 assert(constantvalue_index_addr != NULL, "invariant");
1280 assert(is_synthetic_addr != NULL, "invariant");
1281 assert(generic_signature_index_addr != NULL, "invariant");
1282 assert(parsed_annotations != NULL, "invariant");
1283 assert(attributes_count > 0, "attributes_count should be greater than 0");
1284
1285 u2 constantvalue_index = 0;
1286 u2 generic_signature_index = 0;
1287 bool is_synthetic = false;
1288 const u1* runtime_visible_annotations = NULL;
1289 int runtime_visible_annotations_length = 0;
1290 const u1* runtime_invisible_annotations = NULL;
1291 int runtime_invisible_annotations_length = 0;
1292 const u1* runtime_visible_type_annotations = NULL;
1293 int runtime_visible_type_annotations_length = 0;
1294 const u1* runtime_invisible_type_annotations = NULL;
1295 int runtime_invisible_type_annotations_length = 0;
1296 bool runtime_invisible_annotations_exists = false;
1297 bool runtime_invisible_type_annotations_exists = false;
1298 const ConstantPool* const cp = _cp;
1299
1300 while (attributes_count--) {
1301 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1302 const u2 attribute_name_index = cfs->get_u2_fast();
1303 const u4 attribute_length = cfs->get_u4_fast();
1304 check_property(valid_symbol_at(attribute_name_index),
1305 "Invalid field attribute index %u in class file %s",
1306 attribute_name_index,
1307 CHECK);
1308
1309 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1310 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1311 // ignore if non-static
1312 if (constantvalue_index != 0) {
1313 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1314 }
1315 check_property(
1316 attribute_length == 2,
1317 "Invalid ConstantValue field attribute length %u in class file %s",
1318 attribute_length, CHECK);
1319
1320 constantvalue_index = cfs->get_u2(CHECK);
1321 if (_need_verify) {
1322 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1323 }
1324 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1325 if (attribute_length != 0) {
1326 classfile_parse_error(
1327 "Invalid Synthetic field attribute length %u in class file %s",
1328 attribute_length, CHECK);
1329 }
1330 is_synthetic = true;
1331 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1332 if (attribute_length != 0) {
1333 classfile_parse_error(
1334 "Invalid Deprecated field attribute length %u in class file %s",
1335 attribute_length, CHECK);
1336 }
1337 } else if (_major_version >= JAVA_1_5_VERSION) {
1338 if (attribute_name == vmSymbols::tag_signature()) {
1339 if (generic_signature_index != 0) {
1340 classfile_parse_error(
1341 "Multiple Signature attributes for field in class file %s", CHECK);
1342 }
1343 if (attribute_length != 2) {
1344 classfile_parse_error(
1345 "Wrong size %u for field's Signature attribute in class file %s",
1346 attribute_length, CHECK);
1347 }
1348 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1349 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1350 if (runtime_visible_annotations != NULL) {
1351 classfile_parse_error(
1352 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1353 }
1354 runtime_visible_annotations_length = attribute_length;
1355 runtime_visible_annotations = cfs->current();
1356 assert(runtime_visible_annotations != NULL, "null visible annotations");
1357 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1358 parse_annotations(cp,
1359 runtime_visible_annotations,
1360 runtime_visible_annotations_length,
1361 parsed_annotations,
1362 _loader_data,
1363 CHECK);
1364 cfs->skip_u1_fast(runtime_visible_annotations_length);
1365 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1366 if (runtime_invisible_annotations_exists) {
1367 classfile_parse_error(
1368 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1369 }
1370 runtime_invisible_annotations_exists = true;
1371 if (PreserveAllAnnotations) {
1372 runtime_invisible_annotations_length = attribute_length;
1373 runtime_invisible_annotations = cfs->current();
1374 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1375 }
1376 cfs->skip_u1(attribute_length, CHECK);
1377 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1378 if (runtime_visible_type_annotations != NULL) {
1379 classfile_parse_error(
1380 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1381 }
1382 runtime_visible_type_annotations_length = attribute_length;
1383 runtime_visible_type_annotations = cfs->current();
1384 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1385 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1386 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1387 if (runtime_invisible_type_annotations_exists) {
1388 classfile_parse_error(
1389 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1390 } else {
1391 runtime_invisible_type_annotations_exists = true;
1392 }
1393 if (PreserveAllAnnotations) {
1394 runtime_invisible_type_annotations_length = attribute_length;
1395 runtime_invisible_type_annotations = cfs->current();
1396 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1397 }
1398 cfs->skip_u1(attribute_length, CHECK);
1399 } else {
1400 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1401 }
1402 } else {
1403 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1404 }
1405 }
1406
1407 *constantvalue_index_addr = constantvalue_index;
1408 *is_synthetic_addr = is_synthetic;
1409 *generic_signature_index_addr = generic_signature_index;
1410 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1411 runtime_visible_annotations_length,
1412 runtime_invisible_annotations,
1413 runtime_invisible_annotations_length,
1414 CHECK);
1415 parsed_annotations->set_field_annotations(a);
1416 a = assemble_annotations(runtime_visible_type_annotations,
1417 runtime_visible_type_annotations_length,
1418 runtime_invisible_type_annotations,
1419 runtime_invisible_type_annotations_length,
1420 CHECK);
1421 parsed_annotations->set_field_type_annotations(a);
1422 return;
1423 }
1424
1425
1426 // Field allocation types. Used for computing field offsets.
1427
1428 enum FieldAllocationType {
1429 STATIC_OOP, // Oops
1430 STATIC_BYTE, // Boolean, Byte, char
1431 STATIC_SHORT, // shorts
1432 STATIC_WORD, // ints
1433 STATIC_DOUBLE, // aligned long or double
1434 STATIC_FLATTENABLE, // flattenable field
1435 NONSTATIC_OOP,
1436 NONSTATIC_BYTE,
1437 NONSTATIC_SHORT,
1438 NONSTATIC_WORD,
1439 NONSTATIC_DOUBLE,
1440 NONSTATIC_FLATTENABLE,
1441 MAX_FIELD_ALLOCATION_TYPE,
1442 BAD_ALLOCATION_TYPE = -1
1443 };
1444
1445 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1446 BAD_ALLOCATION_TYPE, // 0
1447 BAD_ALLOCATION_TYPE, // 1
1448 BAD_ALLOCATION_TYPE, // 2
1449 BAD_ALLOCATION_TYPE, // 3
1450 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1451 NONSTATIC_SHORT, // T_CHAR = 5,
1452 NONSTATIC_WORD, // T_FLOAT = 6,
1453 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1454 NONSTATIC_BYTE, // T_BYTE = 8,
1455 NONSTATIC_SHORT, // T_SHORT = 9,
1456 NONSTATIC_WORD, // T_INT = 10,
1457 NONSTATIC_DOUBLE, // T_LONG = 11,
1458 NONSTATIC_OOP, // T_OBJECT = 12,
1459 NONSTATIC_OOP, // T_ARRAY = 13,
1460 NONSTATIC_OOP, // T_VALUETYPE = 14,
1461 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1462 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1463 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1464 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1465 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1466 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1467 BAD_ALLOCATION_TYPE, // 0
1468 BAD_ALLOCATION_TYPE, // 1
1469 BAD_ALLOCATION_TYPE, // 2
1470 BAD_ALLOCATION_TYPE, // 3
1471 STATIC_BYTE , // T_BOOLEAN = 4,
1472 STATIC_SHORT, // T_CHAR = 5,
1473 STATIC_WORD, // T_FLOAT = 6,
1474 STATIC_DOUBLE, // T_DOUBLE = 7,
1475 STATIC_BYTE, // T_BYTE = 8,
1476 STATIC_SHORT, // T_SHORT = 9,
1477 STATIC_WORD, // T_INT = 10,
1478 STATIC_DOUBLE, // T_LONG = 11,
1479 STATIC_OOP, // T_OBJECT = 12,
1480 STATIC_OOP, // T_ARRAY = 13,
1481 STATIC_OOP, // T_VALUETYPE = 14,
1482 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1483 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1484 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1485 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1486 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1487 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1488 };
1489
1490 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1491 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1492 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1493 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1494 if (is_flattenable) {
1495 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1496 }
1497 return result;
1498 }
1499
1500 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1501 public:
1502 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1503
1504 FieldAllocationCount() {
1505 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1506 count[i] = 0;
1507 }
1508 }
1509
1510 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1511 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1512 if (atype != BAD_ALLOCATION_TYPE) {
1513 // Make sure there is no overflow with injected fields.
1514 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1515 count[atype]++;
1516 }
1517 return atype;
1518 }
1519 };
1520
1521 // Side-effects: populates the _fields, _fields_annotations,
1522 // _fields_type_annotations fields
1523 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1524 bool is_interface,
1525 bool is_value_type,
1526 FieldAllocationCount* const fac,
1527 ConstantPool* cp,
1528 const int cp_size,
1529 u2* const java_fields_count_ptr,
1530 TRAPS) {
1531
1532 assert(cfs != NULL, "invariant");
1533 assert(fac != NULL, "invariant");
1534 assert(cp != NULL, "invariant");
1535 assert(java_fields_count_ptr != NULL, "invariant");
1536
1537 assert(NULL == _fields, "invariant");
1538 assert(NULL == _fields_annotations, "invariant");
1539 assert(NULL == _fields_type_annotations, "invariant");
1540
1541 cfs->guarantee_more(2, CHECK); // length
1542 const u2 length = cfs->get_u2_fast();
1543 *java_fields_count_ptr = length;
1544
1545 int num_injected = 0;
1546 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1547 &num_injected);
1548
1549 const int total_fields = length + num_injected + (is_value_type ? 2 : 0);
1550
1551 // The field array starts with tuples of shorts
1552 // [access, name index, sig index, initial value index, byte offset].
1553 // A generic signature slot only exists for field with generic
1554 // signature attribute. And the access flag is set with
1555 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1556 // signature slots are at the end of the field array and after all
1557 // other fields data.
1558 //
1559 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1560 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1561 // ...
1562 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1563 // [generic signature index]
1564 // [generic signature index]
1565 // ...
1566 //
1567 // Allocate a temporary resource array for field data. For each field,
1568 // a slot is reserved in the temporary array for the generic signature
1569 // index. After parsing all fields, the data are copied to a permanent
1570 // array and any unused slots will be discarded.
1571 ResourceMark rm(THREAD);
1572 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1573 u2,
1574 total_fields * (FieldInfo::field_slots + 1));
1575
1576 // The generic signature slots start after all other fields' data.
1577 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1578 int num_generic_signature = 0;
1579 int instance_fields_count = 0;
1580 for (int n = 0; n < length; n++) {
1581 // access_flags, name_index, descriptor_index, attributes_count
1582 cfs->guarantee_more(8, CHECK);
1583
1584 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1585
1586 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1587 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1588 AccessFlags access_flags;
1589 access_flags.set_flags(flags);
1590
1591 const u2 name_index = cfs->get_u2_fast();
1592 check_property(valid_symbol_at(name_index),
1593 "Invalid constant pool index %u for field name in class file %s",
1594 name_index, CHECK);
1595 const Symbol* const name = cp->symbol_at(name_index);
1596 verify_legal_field_name(name, CHECK);
1597
1598 const u2 signature_index = cfs->get_u2_fast();
1599 check_property(valid_symbol_at(signature_index),
1600 "Invalid constant pool index %u for field signature in class file %s",
1601 signature_index, CHECK);
1602 const Symbol* const sig = cp->symbol_at(signature_index);
1603 verify_legal_field_signature(name, sig, CHECK);
1604 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1605 if (sig->is_Q_signature()) {
1606 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1607 access_flags.set_is_flattenable();
1608 }
1609 if (access_flags.is_flattenable()) {
1610 // Array flattenability cannot be specified. Arrays of value classes are
1611 // are always flattenable. Arrays of other classes are not flattenable.
1612 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1613 classfile_parse_error(
1614 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1615 " ACC_FLATTENABLE cannot be specified for an array",
1616 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1617 }
1618 _has_flattenable_fields = true;
1619 }
1620 if (!access_flags.is_static()) instance_fields_count++;
1621
1622 u2 constantvalue_index = 0;
1623 bool is_synthetic = false;
1624 u2 generic_signature_index = 0;
1625 const bool is_static = access_flags.is_static();
1626 FieldAnnotationCollector parsed_annotations(_loader_data);
1627
1628 const u2 attributes_count = cfs->get_u2_fast();
1629 if (attributes_count > 0) {
1630 parse_field_attributes(cfs,
1631 attributes_count,
1632 is_static,
1633 signature_index,
1634 &constantvalue_index,
1635 &is_synthetic,
1636 &generic_signature_index,
1637 &parsed_annotations,
1638 CHECK);
1639
1640 if (parsed_annotations.field_annotations() != NULL) {
1641 if (_fields_annotations == NULL) {
1642 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1643 _loader_data, length, NULL,
1644 CHECK);
1645 }
1646 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1647 parsed_annotations.set_field_annotations(NULL);
1648 }
1649 if (parsed_annotations.field_type_annotations() != NULL) {
1650 if (_fields_type_annotations == NULL) {
1651 _fields_type_annotations =
1652 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1653 length,
1654 NULL,
1655 CHECK);
1656 }
1657 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1658 parsed_annotations.set_field_type_annotations(NULL);
1659 }
1660
1661 if (is_synthetic) {
1662 access_flags.set_is_synthetic();
1663 }
1664 if (generic_signature_index != 0) {
1665 access_flags.set_field_has_generic_signature();
1666 fa[generic_signature_slot] = generic_signature_index;
1667 generic_signature_slot ++;
1668 num_generic_signature ++;
1669 }
1670 }
1671
1672 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1673 field->initialize(access_flags.as_short(),
1674 name_index,
1675 signature_index,
1676 constantvalue_index);
1677 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1678
1679 // Remember how many oops we encountered and compute allocation type
1680 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1681 field->set_allocation_type(atype);
1682
1683 // After field is initialized with type, we can augment it with aux info
1684 if (parsed_annotations.has_any_annotations())
1685 parsed_annotations.apply_to(field);
1686 }
1687
1688 int index = length;
1689 if (num_injected != 0) {
1690 for (int n = 0; n < num_injected; n++) {
1691 // Check for duplicates
1692 if (injected[n].may_be_java) {
1693 const Symbol* const name = injected[n].name();
1694 const Symbol* const signature = injected[n].signature();
1695 bool duplicate = false;
1696 for (int i = 0; i < length; i++) {
1697 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1698 if (name == cp->symbol_at(f->name_index()) &&
1699 signature == cp->symbol_at(f->signature_index())) {
1700 // Symbol is desclared in Java so skip this one
1701 duplicate = true;
1702 break;
1703 }
1704 }
1705 if (duplicate) {
1706 // These will be removed from the field array at the end
1707 continue;
1708 }
1709 }
1710
1711 // Injected field
1712 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1713 field->initialize(JVM_ACC_FIELD_INTERNAL,
1714 injected[n].name_index,
1715 injected[n].signature_index,
1716 0);
1717
1718 const BasicType type = FieldType::basic_type(injected[n].signature());
1719
1720 // Remember how many oops we encountered and compute allocation type
1721 const FieldAllocationType atype = fac->update(false, type, false);
1722 field->set_allocation_type(atype);
1723 index++;
1724 }
1725 }
1726
1727 if (is_value_type) {
1728 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1729 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1730 vmSymbols::default_value_name_enum,
1731 vmSymbols::java_lang_Object_enum,
1732 0);
1733 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1734 const FieldAllocationType atype = fac->update(true, type, false);
1735 field->set_allocation_type(atype);
1736 index++;
1737 }
1738
1739 if (is_value_type && instance_fields_count == 0) {
1740 _is_empty_value = true;
1741 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1742 field->initialize(JVM_ACC_FIELD_INTERNAL,
1743 vmSymbols::empty_marker_name_enum,
1744 vmSymbols::byte_signature_enum,
1745 0);
1746 const BasicType type = FieldType::basic_type(vmSymbols::byte_signature());
1747 const FieldAllocationType atype = fac->update(false, type, false);
1748 field->set_allocation_type(atype);
1749 index++;
1750 }
1751
1752 assert(NULL == _fields, "invariant");
1753
1754 _fields =
1755 MetadataFactory::new_array<u2>(_loader_data,
1756 index * FieldInfo::field_slots + num_generic_signature,
1757 CHECK);
1758 // Sometimes injected fields already exist in the Java source so
1759 // the fields array could be too long. In that case the
1760 // fields array is trimed. Also unused slots that were reserved
1761 // for generic signature indexes are discarded.
1762 {
1763 int i = 0;
1764 for (; i < index * FieldInfo::field_slots; i++) {
1765 _fields->at_put(i, fa[i]);
1766 }
1767 for (int j = total_fields * FieldInfo::field_slots;
1768 j < generic_signature_slot; j++) {
1769 _fields->at_put(i++, fa[j]);
1770 }
1771 assert(_fields->length() == i, "");
1772 }
1773
1774 if (_need_verify && length > 1) {
1775 // Check duplicated fields
1776 ResourceMark rm(THREAD);
1777 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1778 THREAD, NameSigHash*, HASH_ROW_SIZE);
1779 initialize_hashtable(names_and_sigs);
1780 bool dup = false;
1781 const Symbol* name = NULL;
1782 const Symbol* sig = NULL;
1783 {
1784 debug_only(NoSafepointVerifier nsv;)
1785 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1786 name = fs.name();
1787 sig = fs.signature();
1788 // If no duplicates, add name/signature in hashtable names_and_sigs.
1789 if (!put_after_lookup(name, sig, names_and_sigs)) {
1790 dup = true;
1791 break;
1792 }
1793 }
1794 }
1795 if (dup) {
1796 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1797 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1798 }
1799 }
1800 }
1801
1802
1803 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1804 u4 code_length,
1805 u4 exception_table_length,
1806 TRAPS) {
1807 assert(cfs != NULL, "invariant");
1808
1809 const unsafe_u2* const exception_table_start = cfs->current();
1810 assert(exception_table_start != NULL, "null exception table");
1811
1812 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1813 // end_pc,
1814 // handler_pc,
1815 // catch_type_index
1816
1817 // Will check legal target after parsing code array in verifier.
1818 if (_need_verify) {
1819 for (unsigned int i = 0; i < exception_table_length; i++) {
1820 const u2 start_pc = cfs->get_u2_fast();
1821 const u2 end_pc = cfs->get_u2_fast();
1822 const u2 handler_pc = cfs->get_u2_fast();
1823 const u2 catch_type_index = cfs->get_u2_fast();
1824 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1825 "Illegal exception table range in class file %s",
1826 CHECK_NULL);
1827 guarantee_property(handler_pc < code_length,
1828 "Illegal exception table handler in class file %s",
1829 CHECK_NULL);
1830 if (catch_type_index != 0) {
1831 guarantee_property(valid_klass_reference_at(catch_type_index),
1832 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1833 }
1834 }
1835 } else {
1836 cfs->skip_u2_fast(exception_table_length * 4);
1837 }
1838 return exception_table_start;
1839 }
1840
1841 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1842 u4 code_length,
1843 CompressedLineNumberWriteStream**const write_stream,
1844 TRAPS) {
1845
1846 const ClassFileStream* const cfs = _stream;
1847 unsigned int num_entries = cfs->get_u2(CHECK);
1848
1849 // Each entry is a u2 start_pc, and a u2 line_number
1850 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1851
1852 // Verify line number attribute and table length
1853 check_property(
1854 code_attribute_length == sizeof(u2) + length_in_bytes,
1855 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1856
1857 cfs->guarantee_more(length_in_bytes, CHECK);
1858
1859 if ((*write_stream) == NULL) {
1860 if (length_in_bytes > fixed_buffer_size) {
1861 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1862 } else {
1863 (*write_stream) = new CompressedLineNumberWriteStream(
1864 _linenumbertable_buffer, fixed_buffer_size);
1865 }
1866 }
1867
1868 while (num_entries-- > 0) {
1869 const u2 bci = cfs->get_u2_fast(); // start_pc
1870 const u2 line = cfs->get_u2_fast(); // line_number
1871 guarantee_property(bci < code_length,
1872 "Invalid pc in LineNumberTable in class file %s", CHECK);
1873 (*write_stream)->write_pair(bci, line);
1874 }
1875 }
1876
1877
1878 class LVT_Hash : public AllStatic {
1879 public:
1880
1881 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1882 /*
1883 * 3-tuple start_bci/length/slot has to be unique key,
1884 * so the following comparison seems to be redundant:
1885 * && elem->name_cp_index == entry->_elem->name_cp_index
1886 */
1887 return (e0.start_bci == e1.start_bci &&
1888 e0.length == e1.length &&
1889 e0.name_cp_index == e1.name_cp_index &&
1890 e0.slot == e1.slot);
1891 }
1892
1893 static unsigned int hash(LocalVariableTableElement const& e0) {
1894 unsigned int raw_hash = e0.start_bci;
1895
1896 raw_hash = e0.length + raw_hash * 37;
1897 raw_hash = e0.name_cp_index + raw_hash * 37;
1898 raw_hash = e0.slot + raw_hash * 37;
1899
1900 return raw_hash;
1901 }
1902 };
1903
1904
1905 // Class file LocalVariableTable elements.
1906 class Classfile_LVT_Element {
1907 public:
1908 u2 start_bci;
1909 u2 length;
1910 u2 name_cp_index;
1911 u2 descriptor_cp_index;
1912 u2 slot;
1913 };
1914
1915 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1916 LocalVariableTableElement* const lvt) {
1917 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1918 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1919 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1920 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1921 lvt->signature_cp_index = 0;
1922 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1923 }
1924
1925 // Function is used to parse both attributes:
1926 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1927 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1928 u4 code_length,
1929 u2 max_locals,
1930 u4 code_attribute_length,
1931 u2* const localvariable_table_length,
1932 bool isLVTT,
1933 TRAPS) {
1934 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1935 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1936 const unsigned int size =
1937 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1938
1939 const ConstantPool* const cp = _cp;
1940
1941 // Verify local variable table attribute has right length
1942 if (_need_verify) {
1943 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1944 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1945 }
1946
1947 const unsafe_u2* const localvariable_table_start = cfs->current();
1948 assert(localvariable_table_start != NULL, "null local variable table");
1949 if (!_need_verify) {
1950 cfs->skip_u2_fast(size);
1951 } else {
1952 cfs->guarantee_more(size * 2, CHECK_NULL);
1953 for(int i = 0; i < (*localvariable_table_length); i++) {
1954 const u2 start_pc = cfs->get_u2_fast();
1955 const u2 length = cfs->get_u2_fast();
1956 const u2 name_index = cfs->get_u2_fast();
1957 const u2 descriptor_index = cfs->get_u2_fast();
1958 const u2 index = cfs->get_u2_fast();
1959 // Assign to a u4 to avoid overflow
1960 const u4 end_pc = (u4)start_pc + (u4)length;
1961
1962 if (start_pc >= code_length) {
1963 classfile_parse_error(
1964 "Invalid start_pc %u in %s in class file %s",
1965 start_pc, tbl_name, CHECK_NULL);
1966 }
1967 if (end_pc > code_length) {
1968 classfile_parse_error(
1969 "Invalid length %u in %s in class file %s",
1970 length, tbl_name, CHECK_NULL);
1971 }
1972 const int cp_size = cp->length();
1973 guarantee_property(valid_symbol_at(name_index),
1974 "Name index %u in %s has bad constant type in class file %s",
1975 name_index, tbl_name, CHECK_NULL);
1976 guarantee_property(valid_symbol_at(descriptor_index),
1977 "Signature index %u in %s has bad constant type in class file %s",
1978 descriptor_index, tbl_name, CHECK_NULL);
1979
1980 const Symbol* const name = cp->symbol_at(name_index);
1981 const Symbol* const sig = cp->symbol_at(descriptor_index);
1982 verify_legal_field_name(name, CHECK_NULL);
1983 u2 extra_slot = 0;
1984 if (!isLVTT) {
1985 verify_legal_field_signature(name, sig, CHECK_NULL);
1986
1987 // 4894874: check special cases for double and long local variables
1988 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1989 sig == vmSymbols::type_signature(T_LONG)) {
1990 extra_slot = 1;
1991 }
1992 }
1993 guarantee_property((index + extra_slot) < max_locals,
1994 "Invalid index %u in %s in class file %s",
1995 index, tbl_name, CHECK_NULL);
1996 }
1997 }
1998 return localvariable_table_start;
1999 }
2000
2001 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2002 u4 code_attribute_length,
2003 bool need_verify,
2004 TRAPS) {
2005 assert(cfs != NULL, "invariant");
2006
2007 if (0 == code_attribute_length) {
2008 return NULL;
2009 }
2010
2011 const u1* const stackmap_table_start = cfs->current();
2012 assert(stackmap_table_start != NULL, "null stackmap table");
2013
2014 // check code_attribute_length first
2015 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2016
2017 if (!need_verify && !DumpSharedSpaces) {
2018 return NULL;
2019 }
2020 return stackmap_table_start;
2021 }
2022
2023 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2024 u2* const checked_exceptions_length,
2025 u4 method_attribute_length,
2026 TRAPS) {
2027 assert(cfs != NULL, "invariant");
2028 assert(checked_exceptions_length != NULL, "invariant");
2029
2030 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2031 *checked_exceptions_length = cfs->get_u2_fast();
2032 const unsigned int size =
2033 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2034 const unsafe_u2* const checked_exceptions_start = cfs->current();
2035 assert(checked_exceptions_start != NULL, "null checked exceptions");
2036 if (!_need_verify) {
2037 cfs->skip_u2_fast(size);
2038 } else {
2039 // Verify each value in the checked exception table
2040 u2 checked_exception;
2041 const u2 len = *checked_exceptions_length;
2042 cfs->guarantee_more(2 * len, CHECK_NULL);
2043 for (int i = 0; i < len; i++) {
2044 checked_exception = cfs->get_u2_fast();
2045 check_property(
2046 valid_klass_reference_at(checked_exception),
2047 "Exception name has bad type at constant pool %u in class file %s",
2048 checked_exception, CHECK_NULL);
2049 }
2050 }
2051 // check exceptions attribute length
2052 if (_need_verify) {
2053 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2054 sizeof(u2) * size),
2055 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2056 }
2057 return checked_exceptions_start;
2058 }
2059
2060 void ClassFileParser::throwIllegalSignature(const char* type,
2061 const Symbol* name,
2062 const Symbol* sig,
2063 TRAPS) const {
2064 assert(name != NULL, "invariant");
2065 assert(sig != NULL, "invariant");
2066
2067 const char* class_note = "";
2068 if (is_value_type() && name == vmSymbols::object_initializer_name()) {
2069 class_note = " (an inline class)";
2070 }
2071
2072 ResourceMark rm(THREAD);
2073 Exceptions::fthrow(THREAD_AND_LOCATION,
2074 vmSymbols::java_lang_ClassFormatError(),
2075 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2076 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2077 }
2078
2079 AnnotationCollector::ID
2080 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2081 const Symbol* name) {
2082 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2083 // Privileged code can use all annotations. Other code silently drops some.
2084 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2085 loader_data->is_platform_class_loader_data() ||
2086 loader_data->is_unsafe_anonymous();
2087 switch (sid) {
2088 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2089 if (_location != _in_method) break; // only allow for methods
2090 if (!privileged) break; // only allow in privileged code
2091 return _method_CallerSensitive;
2092 }
2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2094 if (_location != _in_method) break; // only allow for methods
2095 if (!privileged) break; // only allow in privileged code
2096 return _method_ForceInline;
2097 }
2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2099 if (_location != _in_method) break; // only allow for methods
2100 if (!privileged) break; // only allow in privileged code
2101 return _method_DontInline;
2102 }
2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2104 if (_location != _in_method) break; // only allow for methods
2105 if (!privileged) break; // only allow in privileged code
2106 return _method_InjectedProfile;
2107 }
2108 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2109 if (_location != _in_method) break; // only allow for methods
2110 if (!privileged) break; // only allow in privileged code
2111 return _method_LambdaForm_Compiled;
2112 }
2113 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2114 if (_location != _in_method) break; // only allow for methods
2115 if (!privileged) break; // only allow in privileged code
2116 return _method_Hidden;
2117 }
2118 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2119 if (_location != _in_method) break; // only allow for methods
2120 if (!privileged) break; // only allow in privileged code
2121 return _method_HotSpotIntrinsicCandidate;
2122 }
2123 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2124 if (_location != _in_field) break; // only allow for fields
2125 if (!privileged) break; // only allow in privileged code
2126 return _field_Stable;
2127 }
2128 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2129 if (_location != _in_field && _location != _in_class) {
2130 break; // only allow for fields and classes
2131 }
2132 if (!EnableContended || (RestrictContended && !privileged)) {
2133 break; // honor privileges
2134 }
2135 return _jdk_internal_vm_annotation_Contended;
2136 }
2137 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2138 if (_location != _in_method) break; // only allow for methods
2139 if (RestrictReservedStack && !privileged) break; // honor privileges
2140 return _jdk_internal_vm_annotation_ReservedStackAccess;
2141 }
2142 default: {
2143 break;
2144 }
2145 }
2146 return AnnotationCollector::_unknown;
2147 }
2148
2149 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2150 if (is_contended())
2151 f->set_contended_group(contended_group());
2152 if (is_stable())
2153 f->set_stable(true);
2154 }
2155
2156 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2157 // If there's an error deallocate metadata for field annotations
2158 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2159 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2160 }
2161
2162 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2163 if (has_annotation(_method_CallerSensitive))
2164 m->set_caller_sensitive(true);
2165 if (has_annotation(_method_ForceInline))
2166 m->set_force_inline(true);
2167 if (has_annotation(_method_DontInline))
2168 m->set_dont_inline(true);
2169 if (has_annotation(_method_InjectedProfile))
2170 m->set_has_injected_profile(true);
2171 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2172 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2173 if (has_annotation(_method_Hidden))
2174 m->set_hidden(true);
2175 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2176 m->set_intrinsic_candidate(true);
2177 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2178 m->set_has_reserved_stack_access(true);
2179 }
2180
2181 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2182 assert(ik != NULL, "invariant");
2183 ik->set_is_contended(is_contended());
2184 }
2185
2186 #define MAX_ARGS_SIZE 255
2187 #define MAX_CODE_SIZE 65535
2188 #define INITIAL_MAX_LVT_NUMBER 256
2189
2190 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2191 *
2192 * Rules for LVT's and LVTT's are:
2193 * - There can be any number of LVT's and LVTT's.
2194 * - If there are n LVT's, it is the same as if there was just
2195 * one LVT containing all the entries from the n LVT's.
2196 * - There may be no more than one LVT entry per local variable.
2197 * Two LVT entries are 'equal' if these fields are the same:
2198 * start_pc, length, name, slot
2199 * - There may be no more than one LVTT entry per each LVT entry.
2200 * Each LVTT entry has to match some LVT entry.
2201 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2202 */
2203 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2204 int lvt_cnt,
2205 u2* const localvariable_table_length,
2206 const unsafe_u2** const localvariable_table_start,
2207 int lvtt_cnt,
2208 u2* const localvariable_type_table_length,
2209 const unsafe_u2** const localvariable_type_table_start,
2210 TRAPS) {
2211
2212 ResourceMark rm(THREAD);
2213
2214 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2215 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2216
2217 LVT_HashTable* const table = new LVT_HashTable();
2218
2219 // To fill LocalVariableTable in
2220 const Classfile_LVT_Element* cf_lvt;
2221 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2222
2223 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2224 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2225 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2226 copy_lvt_element(&cf_lvt[idx], lvt);
2227 // If no duplicates, add LVT elem in hashtable.
2228 if (table->put(*lvt, lvt) == false
2229 && _need_verify
2230 && _major_version >= JAVA_1_5_VERSION) {
2231 classfile_parse_error("Duplicated LocalVariableTable attribute "
2232 "entry for '%s' in class file %s",
2233 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2234 CHECK);
2235 }
2236 }
2237 }
2238
2239 // To merge LocalVariableTable and LocalVariableTypeTable
2240 const Classfile_LVT_Element* cf_lvtt;
2241 LocalVariableTableElement lvtt_elem;
2242
2243 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2244 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2245 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2246 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2247 LocalVariableTableElement** entry = table->get(lvtt_elem);
2248 if (entry == NULL) {
2249 if (_need_verify) {
2250 classfile_parse_error("LVTT entry for '%s' in class file %s "
2251 "does not match any LVT entry",
2252 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2253 CHECK);
2254 }
2255 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2256 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2257 "entry for '%s' in class file %s",
2258 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2259 CHECK);
2260 } else {
2261 // to add generic signatures into LocalVariableTable
2262 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2263 }
2264 }
2265 }
2266 }
2267
2268
2269 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2270 const u1* runtime_visible_annotations,
2271 int runtime_visible_annotations_length,
2272 const u1* runtime_invisible_annotations,
2273 int runtime_invisible_annotations_length,
2274 const u1* runtime_visible_parameter_annotations,
2275 int runtime_visible_parameter_annotations_length,
2276 const u1* runtime_invisible_parameter_annotations,
2277 int runtime_invisible_parameter_annotations_length,
2278 const u1* runtime_visible_type_annotations,
2279 int runtime_visible_type_annotations_length,
2280 const u1* runtime_invisible_type_annotations,
2281 int runtime_invisible_type_annotations_length,
2282 const u1* annotation_default,
2283 int annotation_default_length,
2284 TRAPS) {
2285
2286 AnnotationArray* a;
2287
2288 if (runtime_visible_annotations_length +
2289 runtime_invisible_annotations_length > 0) {
2290 a = assemble_annotations(runtime_visible_annotations,
2291 runtime_visible_annotations_length,
2292 runtime_invisible_annotations,
2293 runtime_invisible_annotations_length,
2294 CHECK);
2295 cm->set_method_annotations(a);
2296 }
2297
2298 if (runtime_visible_parameter_annotations_length +
2299 runtime_invisible_parameter_annotations_length > 0) {
2300 a = assemble_annotations(runtime_visible_parameter_annotations,
2301 runtime_visible_parameter_annotations_length,
2302 runtime_invisible_parameter_annotations,
2303 runtime_invisible_parameter_annotations_length,
2304 CHECK);
2305 cm->set_parameter_annotations(a);
2306 }
2307
2308 if (annotation_default_length > 0) {
2309 a = assemble_annotations(annotation_default,
2310 annotation_default_length,
2311 NULL,
2312 0,
2313 CHECK);
2314 cm->set_default_annotations(a);
2315 }
2316
2317 if (runtime_visible_type_annotations_length +
2318 runtime_invisible_type_annotations_length > 0) {
2319 a = assemble_annotations(runtime_visible_type_annotations,
2320 runtime_visible_type_annotations_length,
2321 runtime_invisible_type_annotations,
2322 runtime_invisible_type_annotations_length,
2323 CHECK);
2324 cm->set_type_annotations(a);
2325 }
2326 }
2327
2328
2329 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2330 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2331 // Method* to save footprint, so we only know the size of the resulting Method* when the
2332 // entire method attribute is parsed.
2333 //
2334 // The promoted_flags parameter is used to pass relevant access_flags
2335 // from the method back up to the containing klass. These flag values
2336 // are added to klass's access_flags.
2337
2338 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2339 bool is_interface,
2340 bool is_value_type,
2341 const ConstantPool* cp,
2342 AccessFlags* const promoted_flags,
2343 TRAPS) {
2344 assert(cfs != NULL, "invariant");
2345 assert(cp != NULL, "invariant");
2346 assert(promoted_flags != NULL, "invariant");
2347
2348 ResourceMark rm(THREAD);
2349 // Parse fixed parts:
2350 // access_flags, name_index, descriptor_index, attributes_count
2351 cfs->guarantee_more(8, CHECK_NULL);
2352
2353 int flags = cfs->get_u2_fast();
2354 const u2 name_index = cfs->get_u2_fast();
2355 const int cp_size = cp->length();
2356 check_property(
2357 valid_symbol_at(name_index),
2358 "Illegal constant pool index %u for method name in class file %s",
2359 name_index, CHECK_NULL);
2360 const Symbol* const name = cp->symbol_at(name_index);
2361 verify_legal_method_name(name, CHECK_NULL);
2362
2363 const u2 signature_index = cfs->get_u2_fast();
2364 guarantee_property(
2365 valid_symbol_at(signature_index),
2366 "Illegal constant pool index %u for method signature in class file %s",
2367 signature_index, CHECK_NULL);
2368 const Symbol* const signature = cp->symbol_at(signature_index);
2369
2370 if (name == vmSymbols::class_initializer_name()) {
2371 // We ignore the other access flags for a valid class initializer.
2372 // (JVM Spec 2nd ed., chapter 4.6)
2373 if (_major_version < 51) { // backward compatibility
2374 flags = JVM_ACC_STATIC;
2375 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2376 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2377 } else {
2378 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2379 }
2380 } else {
2381 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2382 }
2383
2384 if (name == vmSymbols::object_initializer_name()) {
2385 if (is_interface) {
2386 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2387 } else if (!is_value_type && signature->is_void_method_signature()) {
2388 // OK, a constructor
2389 } else if (is_value_type && !signature->is_void_method_signature()) {
2390 // also OK, a static factory, as long as the return value is good
2391 bool ok = false;
2392 SignatureStream ss((Symbol*) signature, true);
2393 while (!ss.at_return_type()) ss.next();
2394 if (ss.is_object()) {
2395 TempNewSymbol ret = ss.as_symbol_or_null();
2396 const Symbol* required = class_name();
2397 if (is_unsafe_anonymous()) {
2398 // The original class name in the UAC byte stream gets changed. So
2399 // using the original name in the return type is no longer valid.
2400 required = vmSymbols::java_lang_Object();
2401 }
2402 ok = (ret == required);
2403 }
2404 if (!ok) {
2405 throwIllegalSignature("Method", name, signature, CHECK_0);
2406 }
2407 } else {
2408 // not OK, so throw the same error as in verify_legal_method_signature.
2409 throwIllegalSignature("Method", name, signature, CHECK_0);
2410 }
2411 // A declared <init> method must always be either a non-static
2412 // object constructor, with a void return, or else it must be a
2413 // static factory method, with a non-void return. No other
2414 // definition of <init> is possible.
2415 //
2416 // The verifier (in verify_invoke_instructions) will inspect the
2417 // signature of any attempt to invoke <init>, and ensures that it
2418 // returns non-void if and only if it is being invoked by
2419 // invokestatic, and void if and only if it is being invoked by
2420 // invokespecial.
2421 //
2422 // When a symbolic reference to <init> is resolved for a
2423 // particular invocation mode (special or static), the mode is
2424 // matched to the JVM_ACC_STATIC modifier of the <init> method.
2425 // Thus, it is impossible to statically invoke a constructor, and
2426 // impossible to "new + invokespecial" a static factory, either
2427 // through bytecode or through reflection.
2428 }
2429
2430 int args_size = -1; // only used when _need_verify is true
2431 if (_need_verify) {
2432 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2433 verify_legal_method_signature(name, signature, CHECK_NULL);
2434 if (args_size > MAX_ARGS_SIZE) {
2435 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2436 }
2437 }
2438
2439 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2440
2441 // Default values for code and exceptions attribute elements
2442 u2 max_stack = 0;
2443 u2 max_locals = 0;
2444 u4 code_length = 0;
2445 const u1* code_start = 0;
2446 u2 exception_table_length = 0;
2447 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2448 Array<int>* exception_handlers = Universe::the_empty_int_array();
2449 u2 checked_exceptions_length = 0;
2450 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2451 CompressedLineNumberWriteStream* linenumber_table = NULL;
2452 int linenumber_table_length = 0;
2453 int total_lvt_length = 0;
2454 u2 lvt_cnt = 0;
2455 u2 lvtt_cnt = 0;
2456 bool lvt_allocated = false;
2457 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2458 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2459 u2* localvariable_table_length = NULL;
2460 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2461 u2* localvariable_type_table_length = NULL;
2462 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2463 int method_parameters_length = -1;
2464 const u1* method_parameters_data = NULL;
2465 bool method_parameters_seen = false;
2466 bool parsed_code_attribute = false;
2467 bool parsed_checked_exceptions_attribute = false;
2468 bool parsed_stackmap_attribute = false;
2469 // stackmap attribute - JDK1.5
2470 const u1* stackmap_data = NULL;
2471 int stackmap_data_length = 0;
2472 u2 generic_signature_index = 0;
2473 MethodAnnotationCollector parsed_annotations;
2474 const u1* runtime_visible_annotations = NULL;
2475 int runtime_visible_annotations_length = 0;
2476 const u1* runtime_invisible_annotations = NULL;
2477 int runtime_invisible_annotations_length = 0;
2478 const u1* runtime_visible_parameter_annotations = NULL;
2479 int runtime_visible_parameter_annotations_length = 0;
2480 const u1* runtime_invisible_parameter_annotations = NULL;
2481 int runtime_invisible_parameter_annotations_length = 0;
2482 const u1* runtime_visible_type_annotations = NULL;
2483 int runtime_visible_type_annotations_length = 0;
2484 const u1* runtime_invisible_type_annotations = NULL;
2485 int runtime_invisible_type_annotations_length = 0;
2486 bool runtime_invisible_annotations_exists = false;
2487 bool runtime_invisible_type_annotations_exists = false;
2488 bool runtime_invisible_parameter_annotations_exists = false;
2489 const u1* annotation_default = NULL;
2490 int annotation_default_length = 0;
2491
2492 // Parse code and exceptions attribute
2493 u2 method_attributes_count = cfs->get_u2_fast();
2494 while (method_attributes_count--) {
2495 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2496 const u2 method_attribute_name_index = cfs->get_u2_fast();
2497 const u4 method_attribute_length = cfs->get_u4_fast();
2498 check_property(
2499 valid_symbol_at(method_attribute_name_index),
2500 "Invalid method attribute name index %u in class file %s",
2501 method_attribute_name_index, CHECK_NULL);
2502
2503 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2504 if (method_attribute_name == vmSymbols::tag_code()) {
2505 // Parse Code attribute
2506 if (_need_verify) {
2507 guarantee_property(
2508 !access_flags.is_native() && !access_flags.is_abstract(),
2509 "Code attribute in native or abstract methods in class file %s",
2510 CHECK_NULL);
2511 }
2512 if (parsed_code_attribute) {
2513 classfile_parse_error("Multiple Code attributes in class file %s",
2514 CHECK_NULL);
2515 }
2516 parsed_code_attribute = true;
2517
2518 // Stack size, locals size, and code size
2519 if (_major_version == 45 && _minor_version <= 2) {
2520 cfs->guarantee_more(4, CHECK_NULL);
2521 max_stack = cfs->get_u1_fast();
2522 max_locals = cfs->get_u1_fast();
2523 code_length = cfs->get_u2_fast();
2524 } else {
2525 cfs->guarantee_more(8, CHECK_NULL);
2526 max_stack = cfs->get_u2_fast();
2527 max_locals = cfs->get_u2_fast();
2528 code_length = cfs->get_u4_fast();
2529 }
2530 if (_need_verify) {
2531 guarantee_property(args_size <= max_locals,
2532 "Arguments can't fit into locals in class file %s",
2533 CHECK_NULL);
2534 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2535 "Invalid method Code length %u in class file %s",
2536 code_length, CHECK_NULL);
2537 }
2538 // Code pointer
2539 code_start = cfs->current();
2540 assert(code_start != NULL, "null code start");
2541 cfs->guarantee_more(code_length, CHECK_NULL);
2542 cfs->skip_u1_fast(code_length);
2543
2544 // Exception handler table
2545 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2546 exception_table_length = cfs->get_u2_fast();
2547 if (exception_table_length > 0) {
2548 exception_table_start = parse_exception_table(cfs,
2549 code_length,
2550 exception_table_length,
2551 CHECK_NULL);
2552 }
2553
2554 // Parse additional attributes in code attribute
2555 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2556 u2 code_attributes_count = cfs->get_u2_fast();
2557
2558 unsigned int calculated_attribute_length = 0;
2559
2560 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2561 calculated_attribute_length =
2562 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2563 } else {
2564 // max_stack, locals and length are smaller in pre-version 45.2 classes
2565 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2566 }
2567 calculated_attribute_length +=
2568 code_length +
2569 sizeof(exception_table_length) +
2570 sizeof(code_attributes_count) +
2571 exception_table_length *
2572 ( sizeof(u2) + // start_pc
2573 sizeof(u2) + // end_pc
2574 sizeof(u2) + // handler_pc
2575 sizeof(u2) ); // catch_type_index
2576
2577 while (code_attributes_count--) {
2578 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2579 const u2 code_attribute_name_index = cfs->get_u2_fast();
2580 const u4 code_attribute_length = cfs->get_u4_fast();
2581 calculated_attribute_length += code_attribute_length +
2582 sizeof(code_attribute_name_index) +
2583 sizeof(code_attribute_length);
2584 check_property(valid_symbol_at(code_attribute_name_index),
2585 "Invalid code attribute name index %u in class file %s",
2586 code_attribute_name_index,
2587 CHECK_NULL);
2588 if (LoadLineNumberTables &&
2589 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2590 // Parse and compress line number table
2591 parse_linenumber_table(code_attribute_length,
2592 code_length,
2593 &linenumber_table,
2594 CHECK_NULL);
2595
2596 } else if (LoadLocalVariableTables &&
2597 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2598 // Parse local variable table
2599 if (!lvt_allocated) {
2600 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2601 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2602 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2603 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2604 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2605 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2606 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2607 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2608 lvt_allocated = true;
2609 }
2610 if (lvt_cnt == max_lvt_cnt) {
2611 max_lvt_cnt <<= 1;
2612 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2613 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2614 }
2615 localvariable_table_start[lvt_cnt] =
2616 parse_localvariable_table(cfs,
2617 code_length,
2618 max_locals,
2619 code_attribute_length,
2620 &localvariable_table_length[lvt_cnt],
2621 false, // is not LVTT
2622 CHECK_NULL);
2623 total_lvt_length += localvariable_table_length[lvt_cnt];
2624 lvt_cnt++;
2625 } else if (LoadLocalVariableTypeTables &&
2626 _major_version >= JAVA_1_5_VERSION &&
2627 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2628 if (!lvt_allocated) {
2629 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2630 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2631 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2632 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2633 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2634 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2635 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2636 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2637 lvt_allocated = true;
2638 }
2639 // Parse local variable type table
2640 if (lvtt_cnt == max_lvtt_cnt) {
2641 max_lvtt_cnt <<= 1;
2642 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2643 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2644 }
2645 localvariable_type_table_start[lvtt_cnt] =
2646 parse_localvariable_table(cfs,
2647 code_length,
2648 max_locals,
2649 code_attribute_length,
2650 &localvariable_type_table_length[lvtt_cnt],
2651 true, // is LVTT
2652 CHECK_NULL);
2653 lvtt_cnt++;
2654 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2655 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2656 // Stack map is only needed by the new verifier in JDK1.5.
2657 if (parsed_stackmap_attribute) {
2658 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2659 }
2660 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2661 stackmap_data_length = code_attribute_length;
2662 parsed_stackmap_attribute = true;
2663 } else {
2664 // Skip unknown attributes
2665 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2666 }
2667 }
2668 // check method attribute length
2669 if (_need_verify) {
2670 guarantee_property(method_attribute_length == calculated_attribute_length,
2671 "Code segment has wrong length in class file %s",
2672 CHECK_NULL);
2673 }
2674 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2675 // Parse Exceptions attribute
2676 if (parsed_checked_exceptions_attribute) {
2677 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2678 CHECK_NULL);
2679 }
2680 parsed_checked_exceptions_attribute = true;
2681 checked_exceptions_start =
2682 parse_checked_exceptions(cfs,
2683 &checked_exceptions_length,
2684 method_attribute_length,
2685 CHECK_NULL);
2686 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2687 // reject multiple method parameters
2688 if (method_parameters_seen) {
2689 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2690 CHECK_NULL);
2691 }
2692 method_parameters_seen = true;
2693 method_parameters_length = cfs->get_u1_fast();
2694 const u2 real_length = (method_parameters_length * 4u) + 1u;
2695 if (method_attribute_length != real_length) {
2696 classfile_parse_error(
2697 "Invalid MethodParameters method attribute length %u in class file",
2698 method_attribute_length, CHECK_NULL);
2699 }
2700 method_parameters_data = cfs->current();
2701 cfs->skip_u2_fast(method_parameters_length);
2702 cfs->skip_u2_fast(method_parameters_length);
2703 // ignore this attribute if it cannot be reflected
2704 if (!SystemDictionary::Parameter_klass_loaded())
2705 method_parameters_length = -1;
2706 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2707 if (method_attribute_length != 0) {
2708 classfile_parse_error(
2709 "Invalid Synthetic method attribute length %u in class file %s",
2710 method_attribute_length, CHECK_NULL);
2711 }
2712 // Should we check that there hasn't already been a synthetic attribute?
2713 access_flags.set_is_synthetic();
2714 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2715 if (method_attribute_length != 0) {
2716 classfile_parse_error(
2717 "Invalid Deprecated method attribute length %u in class file %s",
2718 method_attribute_length, CHECK_NULL);
2719 }
2720 } else if (_major_version >= JAVA_1_5_VERSION) {
2721 if (method_attribute_name == vmSymbols::tag_signature()) {
2722 if (generic_signature_index != 0) {
2723 classfile_parse_error(
2724 "Multiple Signature attributes for method in class file %s",
2725 CHECK_NULL);
2726 }
2727 if (method_attribute_length != 2) {
2728 classfile_parse_error(
2729 "Invalid Signature attribute length %u in class file %s",
2730 method_attribute_length, CHECK_NULL);
2731 }
2732 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2733 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2734 if (runtime_visible_annotations != NULL) {
2735 classfile_parse_error(
2736 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2737 CHECK_NULL);
2738 }
2739 runtime_visible_annotations_length = method_attribute_length;
2740 runtime_visible_annotations = cfs->current();
2741 assert(runtime_visible_annotations != NULL, "null visible annotations");
2742 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2743 parse_annotations(cp,
2744 runtime_visible_annotations,
2745 runtime_visible_annotations_length,
2746 &parsed_annotations,
2747 _loader_data,
2748 CHECK_NULL);
2749 cfs->skip_u1_fast(runtime_visible_annotations_length);
2750 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2751 if (runtime_invisible_annotations_exists) {
2752 classfile_parse_error(
2753 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2754 CHECK_NULL);
2755 }
2756 runtime_invisible_annotations_exists = true;
2757 if (PreserveAllAnnotations) {
2758 runtime_invisible_annotations_length = method_attribute_length;
2759 runtime_invisible_annotations = cfs->current();
2760 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2761 }
2762 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2763 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2764 if (runtime_visible_parameter_annotations != NULL) {
2765 classfile_parse_error(
2766 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2767 CHECK_NULL);
2768 }
2769 runtime_visible_parameter_annotations_length = method_attribute_length;
2770 runtime_visible_parameter_annotations = cfs->current();
2771 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2772 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2773 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2774 if (runtime_invisible_parameter_annotations_exists) {
2775 classfile_parse_error(
2776 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2777 CHECK_NULL);
2778 }
2779 runtime_invisible_parameter_annotations_exists = true;
2780 if (PreserveAllAnnotations) {
2781 runtime_invisible_parameter_annotations_length = method_attribute_length;
2782 runtime_invisible_parameter_annotations = cfs->current();
2783 assert(runtime_invisible_parameter_annotations != NULL,
2784 "null invisible parameter annotations");
2785 }
2786 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2787 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2788 if (annotation_default != NULL) {
2789 classfile_parse_error(
2790 "Multiple AnnotationDefault attributes for method in class file %s",
2791 CHECK_NULL);
2792 }
2793 annotation_default_length = method_attribute_length;
2794 annotation_default = cfs->current();
2795 assert(annotation_default != NULL, "null annotation default");
2796 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2797 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2798 if (runtime_visible_type_annotations != NULL) {
2799 classfile_parse_error(
2800 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2801 CHECK_NULL);
2802 }
2803 runtime_visible_type_annotations_length = method_attribute_length;
2804 runtime_visible_type_annotations = cfs->current();
2805 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2806 // No need for the VM to parse Type annotations
2807 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2808 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2809 if (runtime_invisible_type_annotations_exists) {
2810 classfile_parse_error(
2811 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2812 CHECK_NULL);
2813 } else {
2814 runtime_invisible_type_annotations_exists = true;
2815 }
2816 if (PreserveAllAnnotations) {
2817 runtime_invisible_type_annotations_length = method_attribute_length;
2818 runtime_invisible_type_annotations = cfs->current();
2819 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2820 }
2821 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2822 } else {
2823 // Skip unknown attributes
2824 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2825 }
2826 } else {
2827 // Skip unknown attributes
2828 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2829 }
2830 }
2831
2832 if (linenumber_table != NULL) {
2833 linenumber_table->write_terminator();
2834 linenumber_table_length = linenumber_table->position();
2835 }
2836
2837 // Make sure there's at least one Code attribute in non-native/non-abstract method
2838 if (_need_verify) {
2839 guarantee_property(access_flags.is_native() ||
2840 access_flags.is_abstract() ||
2841 parsed_code_attribute,
2842 "Absent Code attribute in method that is not native or abstract in class file %s",
2843 CHECK_NULL);
2844 }
2845
2846 // All sizing information for a Method* is finally available, now create it
2847 InlineTableSizes sizes(
2848 total_lvt_length,
2849 linenumber_table_length,
2850 exception_table_length,
2851 checked_exceptions_length,
2852 method_parameters_length,
2853 generic_signature_index,
2854 runtime_visible_annotations_length +
2855 runtime_invisible_annotations_length,
2856 runtime_visible_parameter_annotations_length +
2857 runtime_invisible_parameter_annotations_length,
2858 runtime_visible_type_annotations_length +
2859 runtime_invisible_type_annotations_length,
2860 annotation_default_length,
2861 0);
2862
2863 Method* const m = Method::allocate(_loader_data,
2864 code_length,
2865 access_flags,
2866 &sizes,
2867 ConstMethod::NORMAL,
2868 CHECK_NULL);
2869
2870 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2871
2872 // Fill in information from fixed part (access_flags already set)
2873 m->set_constants(_cp);
2874 m->set_name_index(name_index);
2875 m->set_signature_index(signature_index);
2876
2877 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2878 m->constMethod()->set_result_type(rtf.type());
2879
2880 if (args_size >= 0) {
2881 m->set_size_of_parameters(args_size);
2882 } else {
2883 m->compute_size_of_parameters(THREAD);
2884 }
2885 #ifdef ASSERT
2886 if (args_size >= 0) {
2887 m->compute_size_of_parameters(THREAD);
2888 assert(args_size == m->size_of_parameters(), "");
2889 }
2890 #endif
2891
2892 // Fill in code attribute information
2893 m->set_max_stack(max_stack);
2894 m->set_max_locals(max_locals);
2895 if (stackmap_data != NULL) {
2896 m->constMethod()->copy_stackmap_data(_loader_data,
2897 (u1*)stackmap_data,
2898 stackmap_data_length,
2899 CHECK_NULL);
2900 }
2901
2902 // Copy byte codes
2903 m->set_code((u1*)code_start);
2904
2905 // Copy line number table
2906 if (linenumber_table != NULL) {
2907 memcpy(m->compressed_linenumber_table(),
2908 linenumber_table->buffer(),
2909 linenumber_table_length);
2910 }
2911
2912 // Copy exception table
2913 if (exception_table_length > 0) {
2914 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2915 m->exception_table_start(),
2916 exception_table_length * sizeof(ExceptionTableElement),
2917 sizeof(u2));
2918 }
2919
2920 // Copy method parameters
2921 if (method_parameters_length > 0) {
2922 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2923 for (int i = 0; i < method_parameters_length; i++) {
2924 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2925 method_parameters_data += 2;
2926 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2927 method_parameters_data += 2;
2928 }
2929 }
2930
2931 // Copy checked exceptions
2932 if (checked_exceptions_length > 0) {
2933 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2934 m->checked_exceptions_start(),
2935 checked_exceptions_length * sizeof(CheckedExceptionElement),
2936 sizeof(u2));
2937 }
2938
2939 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2940 if (total_lvt_length > 0) {
2941 promoted_flags->set_has_localvariable_table();
2942 copy_localvariable_table(m->constMethod(),
2943 lvt_cnt,
2944 localvariable_table_length,
2945 localvariable_table_start,
2946 lvtt_cnt,
2947 localvariable_type_table_length,
2948 localvariable_type_table_start,
2949 CHECK_NULL);
2950 }
2951
2952 if (parsed_annotations.has_any_annotations())
2953 parsed_annotations.apply_to(m);
2954
2955 // Copy annotations
2956 copy_method_annotations(m->constMethod(),
2957 runtime_visible_annotations,
2958 runtime_visible_annotations_length,
2959 runtime_invisible_annotations,
2960 runtime_invisible_annotations_length,
2961 runtime_visible_parameter_annotations,
2962 runtime_visible_parameter_annotations_length,
2963 runtime_invisible_parameter_annotations,
2964 runtime_invisible_parameter_annotations_length,
2965 runtime_visible_type_annotations,
2966 runtime_visible_type_annotations_length,
2967 runtime_invisible_type_annotations,
2968 runtime_invisible_type_annotations_length,
2969 annotation_default,
2970 annotation_default_length,
2971 CHECK_NULL);
2972
2973 if (name == vmSymbols::finalize_method_name() &&
2974 signature == vmSymbols::void_method_signature()) {
2975 if (m->is_empty_method()) {
2976 _has_empty_finalizer = true;
2977 } else {
2978 _has_finalizer = true;
2979 }
2980 }
2981 if (name == vmSymbols::object_initializer_name() &&
2982 signature == vmSymbols::void_method_signature() &&
2983 m->is_vanilla_constructor()) {
2984 _has_vanilla_constructor = true;
2985 }
2986
2987 NOT_PRODUCT(m->verify());
2988 return m;
2989 }
2990
2991
2992 // The promoted_flags parameter is used to pass relevant access_flags
2993 // from the methods back up to the containing klass. These flag values
2994 // are added to klass's access_flags.
2995 // Side-effects: populates the _methods field in the parser
2996 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2997 bool is_interface,
2998 bool is_value_type,
2999 AccessFlags* promoted_flags,
3000 bool* has_final_method,
3001 bool* declares_nonstatic_concrete_methods,
3002 TRAPS) {
3003 assert(cfs != NULL, "invariant");
3004 assert(promoted_flags != NULL, "invariant");
3005 assert(has_final_method != NULL, "invariant");
3006 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3007
3008 assert(NULL == _methods, "invariant");
3009
3010 cfs->guarantee_more(2, CHECK); // length
3011 const u2 length = cfs->get_u2_fast();
3012 if (length == 0) {
3013 _methods = Universe::the_empty_method_array();
3014 } else {
3015 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3016 length,
3017 NULL,
3018 CHECK);
3019
3020 for (int index = 0; index < length; index++) {
3021 Method* method = parse_method(cfs,
3022 is_interface,
3023 is_value_type,
3024 _cp,
3025 promoted_flags,
3026 CHECK);
3027
3028 if (method->is_final()) {
3029 *has_final_method = true;
3030 }
3031 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3032 // used for interface initialization, and default method inheritance analysis
3033 if (is_interface && !(*declares_nonstatic_concrete_methods)
3034 && !method->is_abstract() && !method->is_static()) {
3035 *declares_nonstatic_concrete_methods = true;
3036 }
3037 _methods->at_put(index, method);
3038 }
3039
3040 if (_need_verify && length > 1) {
3041 // Check duplicated methods
3042 ResourceMark rm(THREAD);
3043 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3044 THREAD, NameSigHash*, HASH_ROW_SIZE);
3045 initialize_hashtable(names_and_sigs);
3046 bool dup = false;
3047 const Symbol* name = NULL;
3048 const Symbol* sig = NULL;
3049 {
3050 debug_only(NoSafepointVerifier nsv;)
3051 for (int i = 0; i < length; i++) {
3052 const Method* const m = _methods->at(i);
3053 name = m->name();
3054 sig = m->signature();
3055 // If no duplicates, add name/signature in hashtable names_and_sigs.
3056 if (!put_after_lookup(name, sig, names_and_sigs)) {
3057 dup = true;
3058 break;
3059 }
3060 }
3061 }
3062 if (dup) {
3063 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3064 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3065 }
3066 }
3067 }
3068 }
3069
3070 static const intArray* sort_methods(Array<Method*>* methods) {
3071 const int length = methods->length();
3072 // If JVMTI original method ordering or sharing is enabled we have to
3073 // remember the original class file ordering.
3074 // We temporarily use the vtable_index field in the Method* to store the
3075 // class file index, so we can read in after calling qsort.
3076 // Put the method ordering in the shared archive.
3077 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3078 for (int index = 0; index < length; index++) {
3079 Method* const m = methods->at(index);
3080 assert(!m->valid_vtable_index(), "vtable index should not be set");
3081 m->set_vtable_index(index);
3082 }
3083 }
3084 // Sort method array by ascending method name (for faster lookups & vtable construction)
3085 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3086 Method::sort_methods(methods);
3087
3088 intArray* method_ordering = NULL;
3089 // If JVMTI original method ordering or sharing is enabled construct int
3090 // array remembering the original ordering
3091 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3092 method_ordering = new intArray(length, length, -1);
3093 for (int index = 0; index < length; index++) {
3094 Method* const m = methods->at(index);
3095 const int old_index = m->vtable_index();
3096 assert(old_index >= 0 && old_index < length, "invalid method index");
3097 method_ordering->at_put(index, old_index);
3098 m->set_vtable_index(Method::invalid_vtable_index);
3099 }
3100 }
3101 return method_ordering;
3102 }
3103
3104 // Parse generic_signature attribute for methods and fields
3105 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3106 TRAPS) {
3107 assert(cfs != NULL, "invariant");
3108
3109 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3110 const u2 generic_signature_index = cfs->get_u2_fast();
3111 check_property(
3112 valid_symbol_at(generic_signature_index),
3113 "Invalid Signature attribute at constant pool index %u in class file %s",
3114 generic_signature_index, CHECK_0);
3115 return generic_signature_index;
3116 }
3117
3118 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3119 TRAPS) {
3120
3121 assert(cfs != NULL, "invariant");
3122
3123 cfs->guarantee_more(2, CHECK); // sourcefile_index
3124 const u2 sourcefile_index = cfs->get_u2_fast();
3125 check_property(
3126 valid_symbol_at(sourcefile_index),
3127 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3128 sourcefile_index, CHECK);
3129 set_class_sourcefile_index(sourcefile_index);
3130 }
3131
3132 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3133 int length,
3134 TRAPS) {
3135 assert(cfs != NULL, "invariant");
3136
3137 const u1* const sde_buffer = cfs->current();
3138 assert(sde_buffer != NULL, "null sde buffer");
3139
3140 // Don't bother storing it if there is no way to retrieve it
3141 if (JvmtiExport::can_get_source_debug_extension()) {
3142 assert((length+1) > length, "Overflow checking");
3143 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3144 for (int i = 0; i < length; i++) {
3145 sde[i] = sde_buffer[i];
3146 }
3147 sde[length] = '\0';
3148 set_class_sde_buffer((const char*)sde, length);
3149 }
3150 // Got utf8 string, set stream position forward
3151 cfs->skip_u1(length, CHECK);
3152 }
3153
3154
3155 // Inner classes can be static, private or protected (classic VM does this)
3156 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3157 JVM_ACC_PRIVATE | \
3158 JVM_ACC_PROTECTED | \
3159 JVM_ACC_STATIC \
3160 )
3161
3162 // Return number of classes in the inner classes attribute table
3163 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3164 const u1* const inner_classes_attribute_start,
3165 bool parsed_enclosingmethod_attribute,
3166 u2 enclosing_method_class_index,
3167 u2 enclosing_method_method_index,
3168 TRAPS) {
3169 const u1* const current_mark = cfs->current();
3170 u2 length = 0;
3171 if (inner_classes_attribute_start != NULL) {
3172 cfs->set_current(inner_classes_attribute_start);
3173 cfs->guarantee_more(2, CHECK_0); // length
3174 length = cfs->get_u2_fast();
3175 }
3176
3177 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3178 // method data:
3179 // [inner_class_info_index,
3180 // outer_class_info_index,
3181 // inner_name_index,
3182 // inner_class_access_flags,
3183 // ...
3184 // enclosing_method_class_index,
3185 // enclosing_method_method_index]
3186 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3187 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3188 _inner_classes = inner_classes;
3189
3190 int index = 0;
3191 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3192 for (int n = 0; n < length; n++) {
3193 // Inner class index
3194 const u2 inner_class_info_index = cfs->get_u2_fast();
3195 check_property(
3196 valid_klass_reference_at(inner_class_info_index),
3197 "inner_class_info_index %u has bad constant type in class file %s",
3198 inner_class_info_index, CHECK_0);
3199 // Outer class index
3200 const u2 outer_class_info_index = cfs->get_u2_fast();
3201 check_property(
3202 outer_class_info_index == 0 ||
3203 valid_klass_reference_at(outer_class_info_index),
3204 "outer_class_info_index %u has bad constant type in class file %s",
3205 outer_class_info_index, CHECK_0);
3206 // Inner class name
3207 const u2 inner_name_index = cfs->get_u2_fast();
3208 check_property(
3209 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3210 "inner_name_index %u has bad constant type in class file %s",
3211 inner_name_index, CHECK_0);
3212 if (_need_verify) {
3213 guarantee_property(inner_class_info_index != outer_class_info_index,
3214 "Class is both outer and inner class in class file %s", CHECK_0);
3215 }
3216
3217 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3218 // JVM_ACC_MODULE is defined in JDK-9 and later.
3219 if (_major_version >= JAVA_9_VERSION) {
3220 recognized_modifiers |= JVM_ACC_MODULE;
3221 }
3222 // JVM_ACC_VALUE is defined for class file version 55 and later
3223 if (supports_value_types()) {
3224 recognized_modifiers |= JVM_ACC_VALUE;
3225 }
3226
3227 // Access flags
3228 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3229
3230 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3231 // Set abstract bit for old class files for backward compatibility
3232 flags |= JVM_ACC_ABSTRACT;
3233 }
3234 verify_legal_class_modifiers(flags, CHECK_0);
3235 AccessFlags inner_access_flags(flags);
3236
3237 inner_classes->at_put(index++, inner_class_info_index);
3238 inner_classes->at_put(index++, outer_class_info_index);
3239 inner_classes->at_put(index++, inner_name_index);
3240 inner_classes->at_put(index++, inner_access_flags.as_short());
3241 }
3242
3243 // 4347400: make sure there's no duplicate entry in the classes array
3244 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3245 for(int i = 0; i < length * 4; i += 4) {
3246 for(int j = i + 4; j < length * 4; j += 4) {
3247 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3248 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3249 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3250 inner_classes->at(i+3) != inner_classes->at(j+3)),
3251 "Duplicate entry in InnerClasses in class file %s",
3252 CHECK_0);
3253 }
3254 }
3255 }
3256
3257 // Set EnclosingMethod class and method indexes.
3258 if (parsed_enclosingmethod_attribute) {
3259 inner_classes->at_put(index++, enclosing_method_class_index);
3260 inner_classes->at_put(index++, enclosing_method_method_index);
3261 }
3262 assert(index == size, "wrong size");
3263
3264 // Restore buffer's current position.
3265 cfs->set_current(current_mark);
3266
3267 return length;
3268 }
3269
3270 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3271 const u1* const nest_members_attribute_start,
3272 TRAPS) {
3273 const u1* const current_mark = cfs->current();
3274 u2 length = 0;
3275 if (nest_members_attribute_start != NULL) {
3276 cfs->set_current(nest_members_attribute_start);
3277 cfs->guarantee_more(2, CHECK_0); // length
3278 length = cfs->get_u2_fast();
3279 }
3280 const int size = length;
3281 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3282 _nest_members = nest_members;
3283
3284 int index = 0;
3285 cfs->guarantee_more(2 * length, CHECK_0);
3286 for (int n = 0; n < length; n++) {
3287 const u2 class_info_index = cfs->get_u2_fast();
3288 check_property(
3289 valid_klass_reference_at(class_info_index),
3290 "Nest member class_info_index %u has bad constant type in class file %s",
3291 class_info_index, CHECK_0);
3292 nest_members->at_put(index++, class_info_index);
3293 }
3294 assert(index == size, "wrong size");
3295
3296 // Restore buffer's current position.
3297 cfs->set_current(current_mark);
3298
3299 return length;
3300 }
3301
3302 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3303 set_class_synthetic_flag(true);
3304 }
3305
3306 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3307 assert(cfs != NULL, "invariant");
3308
3309 const u2 signature_index = cfs->get_u2(CHECK);
3310 check_property(
3311 valid_symbol_at(signature_index),
3312 "Invalid constant pool index %u in Signature attribute in class file %s",
3313 signature_index, CHECK);
3314 set_class_generic_signature_index(signature_index);
3315 }
3316
3317 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3318 ConstantPool* cp,
3319 u4 attribute_byte_length,
3320 TRAPS) {
3321 assert(cfs != NULL, "invariant");
3322 assert(cp != NULL, "invariant");
3323
3324 const u1* const current_start = cfs->current();
3325
3326 guarantee_property(attribute_byte_length >= sizeof(u2),
3327 "Invalid BootstrapMethods attribute length %u in class file %s",
3328 attribute_byte_length,
3329 CHECK);
3330
3331 cfs->guarantee_more(attribute_byte_length, CHECK);
3332
3333 const int attribute_array_length = cfs->get_u2_fast();
3334
3335 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3336 "Short length on BootstrapMethods in class file %s",
3337 CHECK);
3338
3339
3340 // The attribute contains a counted array of counted tuples of shorts,
3341 // represending bootstrap specifiers:
3342 // length*{bootstrap_method_index, argument_count*{argument_index}}
3343 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3344 // operand_count = number of shorts in attr, except for leading length
3345
3346 // The attribute is copied into a short[] array.
3347 // The array begins with a series of short[2] pairs, one for each tuple.
3348 const int index_size = (attribute_array_length * 2);
3349
3350 Array<u2>* const operands =
3351 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3352
3353 // Eagerly assign operands so they will be deallocated with the constant
3354 // pool if there is an error.
3355 cp->set_operands(operands);
3356
3357 int operand_fill_index = index_size;
3358 const int cp_size = cp->length();
3359
3360 for (int n = 0; n < attribute_array_length; n++) {
3361 // Store a 32-bit offset into the header of the operand array.
3362 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3363
3364 // Read a bootstrap specifier.
3365 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3366 const u2 bootstrap_method_index = cfs->get_u2_fast();
3367 const u2 argument_count = cfs->get_u2_fast();
3368 check_property(
3369 valid_cp_range(bootstrap_method_index, cp_size) &&
3370 cp->tag_at(bootstrap_method_index).is_method_handle(),
3371 "bootstrap_method_index %u has bad constant type in class file %s",
3372 bootstrap_method_index,
3373 CHECK);
3374
3375 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3376 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3377 CHECK);
3378
3379 operands->at_put(operand_fill_index++, bootstrap_method_index);
3380 operands->at_put(operand_fill_index++, argument_count);
3381
3382 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3383 for (int j = 0; j < argument_count; j++) {
3384 const u2 argument_index = cfs->get_u2_fast();
3385 check_property(
3386 valid_cp_range(argument_index, cp_size) &&
3387 cp->tag_at(argument_index).is_loadable_constant(),
3388 "argument_index %u has bad constant type in class file %s",
3389 argument_index,
3390 CHECK);
3391 operands->at_put(operand_fill_index++, argument_index);
3392 }
3393 }
3394 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3395 "Bad length on BootstrapMethods in class file %s",
3396 CHECK);
3397 }
3398
3399 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3400 ConstantPool* cp,
3401 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3402 TRAPS) {
3403 assert(cfs != NULL, "invariant");
3404 assert(cp != NULL, "invariant");
3405 assert(parsed_annotations != NULL, "invariant");
3406
3407 // Set inner classes attribute to default sentinel
3408 _inner_classes = Universe::the_empty_short_array();
3409 // Set nest members attribute to default sentinel
3410 _nest_members = Universe::the_empty_short_array();
3411 cfs->guarantee_more(2, CHECK); // attributes_count
3412 u2 attributes_count = cfs->get_u2_fast();
3413 bool parsed_sourcefile_attribute = false;
3414 bool parsed_innerclasses_attribute = false;
3415 bool parsed_nest_members_attribute = false;
3416 bool parsed_nest_host_attribute = false;
3417 bool parsed_enclosingmethod_attribute = false;
3418 bool parsed_bootstrap_methods_attribute = false;
3419 const u1* runtime_visible_annotations = NULL;
3420 int runtime_visible_annotations_length = 0;
3421 const u1* runtime_invisible_annotations = NULL;
3422 int runtime_invisible_annotations_length = 0;
3423 const u1* runtime_visible_type_annotations = NULL;
3424 int runtime_visible_type_annotations_length = 0;
3425 const u1* runtime_invisible_type_annotations = NULL;
3426 int runtime_invisible_type_annotations_length = 0;
3427 bool runtime_invisible_type_annotations_exists = false;
3428 bool runtime_invisible_annotations_exists = false;
3429 bool parsed_source_debug_ext_annotations_exist = false;
3430 const u1* inner_classes_attribute_start = NULL;
3431 u4 inner_classes_attribute_length = 0;
3432 const u1* value_types_attribute_start = NULL;
3433 u4 value_types_attribute_length = 0;
3434 u2 enclosing_method_class_index = 0;
3435 u2 enclosing_method_method_index = 0;
3436 const u1* nest_members_attribute_start = NULL;
3437 u4 nest_members_attribute_length = 0;
3438
3439 // Iterate over attributes
3440 while (attributes_count--) {
3441 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3442 const u2 attribute_name_index = cfs->get_u2_fast();
3443 const u4 attribute_length = cfs->get_u4_fast();
3444 check_property(
3445 valid_symbol_at(attribute_name_index),
3446 "Attribute name has bad constant pool index %u in class file %s",
3447 attribute_name_index, CHECK);
3448 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3449 if (tag == vmSymbols::tag_source_file()) {
3450 // Check for SourceFile tag
3451 if (_need_verify) {
3452 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3453 }
3454 if (parsed_sourcefile_attribute) {
3455 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3456 } else {
3457 parsed_sourcefile_attribute = true;
3458 }
3459 parse_classfile_sourcefile_attribute(cfs, CHECK);
3460 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3461 // Check for SourceDebugExtension tag
3462 if (parsed_source_debug_ext_annotations_exist) {
3463 classfile_parse_error(
3464 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3465 }
3466 parsed_source_debug_ext_annotations_exist = true;
3467 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3468 } else if (tag == vmSymbols::tag_inner_classes()) {
3469 // Check for InnerClasses tag
3470 if (parsed_innerclasses_attribute) {
3471 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3472 } else {
3473 parsed_innerclasses_attribute = true;
3474 }
3475 inner_classes_attribute_start = cfs->current();
3476 inner_classes_attribute_length = attribute_length;
3477 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3478 } else if (tag == vmSymbols::tag_synthetic()) {
3479 // Check for Synthetic tag
3480 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3481 if (attribute_length != 0) {
3482 classfile_parse_error(
3483 "Invalid Synthetic classfile attribute length %u in class file %s",
3484 attribute_length, CHECK);
3485 }
3486 parse_classfile_synthetic_attribute(CHECK);
3487 } else if (tag == vmSymbols::tag_deprecated()) {
3488 // Check for Deprecatd tag - 4276120
3489 if (attribute_length != 0) {
3490 classfile_parse_error(
3491 "Invalid Deprecated classfile attribute length %u in class file %s",
3492 attribute_length, CHECK);
3493 }
3494 } else if (_major_version >= JAVA_1_5_VERSION) {
3495 if (tag == vmSymbols::tag_signature()) {
3496 if (_generic_signature_index != 0) {
3497 classfile_parse_error(
3498 "Multiple Signature attributes in class file %s", CHECK);
3499 }
3500 if (attribute_length != 2) {
3501 classfile_parse_error(
3502 "Wrong Signature attribute length %u in class file %s",
3503 attribute_length, CHECK);
3504 }
3505 parse_classfile_signature_attribute(cfs, CHECK);
3506 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3507 if (runtime_visible_annotations != NULL) {
3508 classfile_parse_error(
3509 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3510 }
3511 runtime_visible_annotations_length = attribute_length;
3512 runtime_visible_annotations = cfs->current();
3513 assert(runtime_visible_annotations != NULL, "null visible annotations");
3514 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3515 parse_annotations(cp,
3516 runtime_visible_annotations,
3517 runtime_visible_annotations_length,
3518 parsed_annotations,
3519 _loader_data,
3520 CHECK);
3521 cfs->skip_u1_fast(runtime_visible_annotations_length);
3522 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3523 if (runtime_invisible_annotations_exists) {
3524 classfile_parse_error(
3525 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3526 }
3527 runtime_invisible_annotations_exists = true;
3528 if (PreserveAllAnnotations) {
3529 runtime_invisible_annotations_length = attribute_length;
3530 runtime_invisible_annotations = cfs->current();
3531 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3532 }
3533 cfs->skip_u1(attribute_length, CHECK);
3534 } else if (tag == vmSymbols::tag_enclosing_method()) {
3535 if (parsed_enclosingmethod_attribute) {
3536 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3537 } else {
3538 parsed_enclosingmethod_attribute = true;
3539 }
3540 guarantee_property(attribute_length == 4,
3541 "Wrong EnclosingMethod attribute length %u in class file %s",
3542 attribute_length, CHECK);
3543 cfs->guarantee_more(4, CHECK); // class_index, method_index
3544 enclosing_method_class_index = cfs->get_u2_fast();
3545 enclosing_method_method_index = cfs->get_u2_fast();
3546 if (enclosing_method_class_index == 0) {
3547 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3548 }
3549 // Validate the constant pool indices and types
3550 check_property(valid_klass_reference_at(enclosing_method_class_index),
3551 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3552 if (enclosing_method_method_index != 0 &&
3553 (!cp->is_within_bounds(enclosing_method_method_index) ||
3554 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3555 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3556 }
3557 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3558 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3559 if (parsed_bootstrap_methods_attribute) {
3560 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3561 }
3562 parsed_bootstrap_methods_attribute = true;
3563 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3564 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3565 if (runtime_visible_type_annotations != NULL) {
3566 classfile_parse_error(
3567 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3568 }
3569 runtime_visible_type_annotations_length = attribute_length;
3570 runtime_visible_type_annotations = cfs->current();
3571 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3572 // No need for the VM to parse Type annotations
3573 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3574 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3575 if (runtime_invisible_type_annotations_exists) {
3576 classfile_parse_error(
3577 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3578 } else {
3579 runtime_invisible_type_annotations_exists = true;
3580 }
3581 if (PreserveAllAnnotations) {
3582 runtime_invisible_type_annotations_length = attribute_length;
3583 runtime_invisible_type_annotations = cfs->current();
3584 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3585 }
3586 cfs->skip_u1(attribute_length, CHECK);
3587 } else if (_major_version >= JAVA_11_VERSION) {
3588 if (tag == vmSymbols::tag_nest_members()) {
3589 // Check for NestMembers tag
3590 if (parsed_nest_members_attribute) {
3591 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3592 } else {
3593 parsed_nest_members_attribute = true;
3594 }
3595 if (parsed_nest_host_attribute) {
3596 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3597 }
3598 nest_members_attribute_start = cfs->current();
3599 nest_members_attribute_length = attribute_length;
3600 cfs->skip_u1(nest_members_attribute_length, CHECK);
3601 } else if (tag == vmSymbols::tag_nest_host()) {
3602 if (parsed_nest_host_attribute) {
3603 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3604 } else {
3605 parsed_nest_host_attribute = true;
3606 }
3607 if (parsed_nest_members_attribute) {
3608 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3609 }
3610 if (_need_verify) {
3611 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3612 }
3613 cfs->guarantee_more(2, CHECK);
3614 u2 class_info_index = cfs->get_u2_fast();
3615 check_property(
3616 valid_klass_reference_at(class_info_index),
3617 "Nest-host class_info_index %u has bad constant type in class file %s",
3618 class_info_index, CHECK);
3619 _nest_host = class_info_index;
3620 } else {
3621 // Unknown attribute
3622 cfs->skip_u1(attribute_length, CHECK);
3623 }
3624 } else {
3625 // Unknown attribute
3626 cfs->skip_u1(attribute_length, CHECK);
3627 }
3628 } else {
3629 // Unknown attribute
3630 cfs->skip_u1(attribute_length, CHECK);
3631 }
3632 }
3633 _annotations = assemble_annotations(runtime_visible_annotations,
3634 runtime_visible_annotations_length,
3635 runtime_invisible_annotations,
3636 runtime_invisible_annotations_length,
3637 CHECK);
3638 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3639 runtime_visible_type_annotations_length,
3640 runtime_invisible_type_annotations,
3641 runtime_invisible_type_annotations_length,
3642 CHECK);
3643
3644 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3645 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3646 cfs,
3647 inner_classes_attribute_start,
3648 parsed_innerclasses_attribute,
3649 enclosing_method_class_index,
3650 enclosing_method_method_index,
3651 CHECK);
3652 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3653 guarantee_property(
3654 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3655 "Wrong InnerClasses attribute length in class file %s", CHECK);
3656 }
3657 }
3658
3659 if (parsed_nest_members_attribute) {
3660 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3661 cfs,
3662 nest_members_attribute_start,
3663 CHECK);
3664 if (_need_verify) {
3665 guarantee_property(
3666 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3667 "Wrong NestMembers attribute length in class file %s", CHECK);
3668 }
3669 }
3670
3671 if (_max_bootstrap_specifier_index >= 0) {
3672 guarantee_property(parsed_bootstrap_methods_attribute,
3673 "Missing BootstrapMethods attribute in class file %s", CHECK);
3674 }
3675 }
3676
3677 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3678 assert(k != NULL, "invariant");
3679
3680 if (_synthetic_flag)
3681 k->set_is_synthetic();
3682 if (_sourcefile_index != 0) {
3683 k->set_source_file_name_index(_sourcefile_index);
3684 }
3685 if (_generic_signature_index != 0) {
3686 k->set_generic_signature_index(_generic_signature_index);
3687 }
3688 if (_sde_buffer != NULL) {
3689 k->set_source_debug_extension(_sde_buffer, _sde_length);
3690 }
3691 }
3692
3693 // Create the Annotations object that will
3694 // hold the annotations array for the Klass.
3695 void ClassFileParser::create_combined_annotations(TRAPS) {
3696 if (_annotations == NULL &&
3697 _type_annotations == NULL &&
3698 _fields_annotations == NULL &&
3699 _fields_type_annotations == NULL) {
3700 // Don't create the Annotations object unnecessarily.
3701 return;
3702 }
3703
3704 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3705 annotations->set_class_annotations(_annotations);
3706 annotations->set_class_type_annotations(_type_annotations);
3707 annotations->set_fields_annotations(_fields_annotations);
3708 annotations->set_fields_type_annotations(_fields_type_annotations);
3709
3710 // This is the Annotations object that will be
3711 // assigned to InstanceKlass being constructed.
3712 _combined_annotations = annotations;
3713
3714 // The annotations arrays below has been transfered the
3715 // _combined_annotations so these fields can now be cleared.
3716 _annotations = NULL;
3717 _type_annotations = NULL;
3718 _fields_annotations = NULL;
3719 _fields_type_annotations = NULL;
3720 }
3721
3722 // Transfer ownership of metadata allocated to the InstanceKlass.
3723 void ClassFileParser::apply_parsed_class_metadata(
3724 InstanceKlass* this_klass,
3725 int java_fields_count, TRAPS) {
3726 assert(this_klass != NULL, "invariant");
3727
3728 _cp->set_pool_holder(this_klass);
3729 this_klass->set_constants(_cp);
3730 this_klass->set_fields(_fields, java_fields_count);
3731 this_klass->set_methods(_methods);
3732 this_klass->set_inner_classes(_inner_classes);
3733 this_klass->set_nest_members(_nest_members);
3734 this_klass->set_nest_host_index(_nest_host);
3735 this_klass->set_local_interfaces(_local_interfaces);
3736 this_klass->set_annotations(_combined_annotations);
3737 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3738 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3739 // its _super. If an OOM occurs while loading the current klass, its _super field
3740 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3741 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3742 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3743
3744 // Clear out these fields so they don't get deallocated by the destructor
3745 clear_class_metadata();
3746 }
3747
3748 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3749 int runtime_visible_annotations_length,
3750 const u1* const runtime_invisible_annotations,
3751 int runtime_invisible_annotations_length,
3752 TRAPS) {
3753 AnnotationArray* annotations = NULL;
3754 if (runtime_visible_annotations != NULL ||
3755 runtime_invisible_annotations != NULL) {
3756 annotations = MetadataFactory::new_array<u1>(_loader_data,
3757 runtime_visible_annotations_length +
3758 runtime_invisible_annotations_length,
3759 CHECK_(annotations));
3760 if (runtime_visible_annotations != NULL) {
3761 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3762 annotations->at_put(i, runtime_visible_annotations[i]);
3763 }
3764 }
3765 if (runtime_invisible_annotations != NULL) {
3766 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3767 int append = runtime_visible_annotations_length+i;
3768 annotations->at_put(append, runtime_invisible_annotations[i]);
3769 }
3770 }
3771 }
3772 return annotations;
3773 }
3774
3775 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3776 const int super_class_index,
3777 const bool need_verify,
3778 TRAPS) {
3779 assert(cp != NULL, "invariant");
3780 const InstanceKlass* super_klass = NULL;
3781
3782 if (super_class_index == 0) {
3783 check_property(_class_name == vmSymbols::java_lang_Object()
3784 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3785 "Invalid superclass index %u in class file %s",
3786 super_class_index,
3787 CHECK_NULL);
3788 } else {
3789 check_property(valid_klass_reference_at(super_class_index),
3790 "Invalid superclass index %u in class file %s",
3791 super_class_index,
3792 CHECK_NULL);
3793 // The class name should be legal because it is checked when parsing constant pool.
3794 // However, make sure it is not an array type.
3795 bool is_array = false;
3796 if (cp->tag_at(super_class_index).is_klass()) {
3797 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3798 if (need_verify)
3799 is_array = super_klass->is_array_klass();
3800 } else if (need_verify) {
3801 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3802 }
3803 if (need_verify) {
3804 guarantee_property(!is_array,
3805 "Bad superclass name in class file %s", CHECK_NULL);
3806 }
3807 }
3808 return super_klass;
3809 }
3810
3811 #ifndef PRODUCT
3812 static void print_field_layout(const Symbol* name,
3813 Array<u2>* fields,
3814 const constantPoolHandle& cp,
3815 int instance_size,
3816 int instance_fields_start,
3817 int instance_fields_end,
3818 int static_fields_end) {
3819
3820 assert(name != NULL, "invariant");
3821
3822 tty->print("%s: field layout\n", name->as_klass_external_name());
3823 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3824 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3825 if (!fs.access_flags().is_static()) {
3826 tty->print(" @%3d \"%s\" %s\n",
3827 fs.offset(),
3828 fs.name()->as_klass_external_name(),
3829 fs.signature()->as_klass_external_name());
3830 }
3831 }
3832 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3833 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3834 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3835 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3836 if (fs.access_flags().is_static()) {
3837 tty->print(" @%3d \"%s\" %s\n",
3838 fs.offset(),
3839 fs.name()->as_klass_external_name(),
3840 fs.signature()->as_klass_external_name());
3841 }
3842 }
3843 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3844 tty->print("\n");
3845 }
3846 #endif
3847
3848 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3849 max_nonstatic_oop_maps = max_blocks;
3850 nonstatic_oop_map_count = 0;
3851 if (max_blocks == 0) {
3852 nonstatic_oop_maps = NULL;
3853 } else {
3854 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3855 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3856 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3857 }
3858 }
3859
3860 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3861 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3862 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3863 }
3864
3865 // addition of super oop maps
3866 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3867 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3868 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3869
3870 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3871 nonstatic_oop_map_count += nof_blocks;
3872 }
3873
3874 // collection of oops
3875 void OopMapBlocksBuilder::add(int offset, int count) {
3876 if (nonstatic_oop_map_count == 0) {
3877 nonstatic_oop_map_count++;
3878 }
3879 OopMapBlock* nonstatic_oop_map = last_oop_map();
3880 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3881 nonstatic_oop_map->set_offset(offset);
3882 nonstatic_oop_map->set_count(count);
3883 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3884 nonstatic_oop_map->increment_count(count);
3885 } else { // Need a new one...
3886 nonstatic_oop_map_count++;
3887 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3888 nonstatic_oop_map = last_oop_map();
3889 nonstatic_oop_map->set_offset(offset);
3890 nonstatic_oop_map->set_count(count);
3891 }
3892 }
3893
3894 // general purpose copy, e.g. into allocated instanceKlass
3895 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
3896 if (nonstatic_oop_map_count != 0) {
3897 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3898 }
3899 }
3900
3901 // Sort and compact adjacent blocks
3902 void OopMapBlocksBuilder::compact(TRAPS) {
3903 if (nonstatic_oop_map_count <= 1) {
3904 return;
3905 }
3906 /*
3907 * Since field layout sneeks in oops before values, we will be able to condense
3908 * blocks. There is potential to compact between super, own refs and values
3909 * containing refs.
3910 *
3911 * Currently compaction is slightly limited due to values being 8 byte aligned.
3912 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3913 * and maybe it doesn't need to be.
3914 */
3915 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3916 (_sort_Fn)OopMapBlock::compare_offset);
3917 if (nonstatic_oop_map_count < 2) {
3918 return;
3919 }
3920
3921 //Make a temp copy, and iterate through and copy back into the orig
3922 ResourceMark rm(THREAD);
3923 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3924 nonstatic_oop_map_count);
3925 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3926 copy(oop_maps_copy);
3927 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3928 unsigned int new_count = 1;
3929 oop_maps_copy++;
3930 while(oop_maps_copy < oop_maps_copy_end) {
3931 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3932 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3933 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3934 } else {
3935 nonstatic_oop_map++;
3936 new_count++;
3937 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3938 nonstatic_oop_map->set_count(oop_maps_copy->count());
3939 }
3940 oop_maps_copy++;
3941 }
3942 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3943 nonstatic_oop_map_count = new_count;
3944 }
3945
3946 void OopMapBlocksBuilder::print_on(outputStream* st) const {
3947 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3948 if (nonstatic_oop_map_count > 0) {
3949 OopMapBlock* map = nonstatic_oop_maps;
3950 OopMapBlock* last_map = last_oop_map();
3951 assert(map <= last_map, "Last less than first");
3952 while (map <= last_map) {
3953 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3954 map->offset() + map->offset_span() - heapOopSize, map->count());
3955 map++;
3956 }
3957 }
3958 }
3959
3960 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
3961 print_on(st);
3962 }
3963
3964 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3965 const char* msg,
3966 const Symbol* name,
3967 const Symbol* sig) const {
3968
3969 ResourceMark rm(THREAD);
3970 if (name == NULL || sig == NULL) {
3971 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3972 vmSymbols::java_lang_ClassFormatError(),
3973 "class: %s - %s", _class_name->as_C_string(), msg);
3974 }
3975 else {
3976 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3977 vmSymbols::java_lang_ClassFormatError(),
3978 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3979 _class_name->as_C_string(), msg);
3980 }
3981 }
3982
3983 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3984 void ClassFileParser::layout_fields(ConstantPool* cp,
3985 const FieldAllocationCount* fac,
3986 const ClassAnnotationCollector* parsed_annotations,
3987 FieldLayoutInfo* info,
3988 TRAPS) {
3989
3990 assert(cp != NULL, "invariant");
3991
3992 // Field size and offset computation
3993 int nonstatic_field_size = _super_klass == NULL ? 0 :
3994 _super_klass->nonstatic_field_size();
3995 int next_nonstatic_valuetype_offset = 0;
3996 int first_nonstatic_valuetype_offset = 0;
3997
3998 // Fields that are value types are handled differently depending if they are static or not:
3999 // - static fields are oops
4000 // - non-static fields are embedded
4001
4002 // Count the contended fields by type.
4003 //
4004 // We ignore static fields, because @Contended is not supported for them.
4005 // The layout code below will also ignore the static fields.
4006 int nonstatic_contended_count = 0;
4007 FieldAllocationCount fac_contended;
4008 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4009 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4010 if (fs.is_contended()) {
4011 fac_contended.count[atype]++;
4012 if (!fs.access_flags().is_static()) {
4013 nonstatic_contended_count++;
4014 }
4015 }
4016 }
4017
4018
4019 // Calculate the starting byte offsets
4020 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4021 // Value types in static fields are not embedded, they are handled with oops
4022 int next_static_double_offset = next_static_oop_offset +
4023 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4024 if (fac->count[STATIC_DOUBLE]) {
4025 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4026 }
4027
4028 int next_static_word_offset = next_static_double_offset +
4029 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4030 int next_static_short_offset = next_static_word_offset +
4031 ((fac->count[STATIC_WORD]) * BytesPerInt);
4032 int next_static_byte_offset = next_static_short_offset +
4033 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4034
4035 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4036 nonstatic_field_size * heapOopSize;
4037
4038 // First field of value types is aligned on a long boundary in order to ease
4039 // in-lining of value types (with header removal) in packed arrays and
4040 // flatten value types
4041 int initial_value_type_padding = 0;
4042 if (is_value_type()) {
4043 int old = nonstatic_fields_start;
4044 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4045 initial_value_type_padding = nonstatic_fields_start - old;
4046 }
4047
4048 int next_nonstatic_field_offset = nonstatic_fields_start;
4049
4050 const bool is_contended_class = parsed_annotations->is_contended();
4051
4052 // Class is contended, pad before all the fields
4053 if (is_contended_class) {
4054 next_nonstatic_field_offset += ContendedPaddingWidth;
4055 }
4056
4057 // Temporary value types restrictions
4058 if (is_value_type()) {
4059 if (is_contended_class) {
4060 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4061 return;
4062 }
4063 }
4064
4065 // Compute the non-contended fields count.
4066 // The packing code below relies on these counts to determine if some field
4067 // can be squeezed into the alignment gap. Contended fields are obviously
4068 // exempt from that.
4069 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4070 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4071 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4072 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4073 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4074
4075 int static_value_type_count = 0;
4076 int nonstatic_value_type_count = 0;
4077 int* nonstatic_value_type_indexes = NULL;
4078 Klass** nonstatic_value_type_klasses = NULL;
4079 unsigned int value_type_oop_map_count = 0;
4080 int not_flattened_value_types = 0;
4081
4082 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4083
4084 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4085 max_nonstatic_value_type);
4086 for (int i = 0; i < max_nonstatic_value_type; i++) {
4087 nonstatic_value_type_indexes[i] = -1;
4088 }
4089 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4090 max_nonstatic_value_type);
4091
4092 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4093 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4094 ResourceMark rm;
4095 if (!fs.signature()->is_Q_signature()) {
4096 THROW(vmSymbols::java_lang_ClassFormatError());
4097 }
4098 static_value_type_count++;
4099 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4100 // Pre-resolve the flattenable field and check for value type circularity issues.
4101 ResourceMark rm;
4102 if (!fs.signature()->is_Q_signature()) {
4103 THROW(vmSymbols::java_lang_ClassFormatError());
4104 }
4105 Klass* klass =
4106 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4107 Handle(THREAD, _loader_data->class_loader()),
4108 _protection_domain, true, CHECK);
4109 assert(klass != NULL, "Sanity check");
4110 if (!klass->access_flags().is_value_type()) {
4111 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4112 }
4113 ValueKlass* vk = ValueKlass::cast(klass);
4114 // Conditions to apply flattening or not should be defined in a single place
4115 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4116 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4117 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4118 nonstatic_value_type_count++;
4119
4120 ValueKlass* vklass = ValueKlass::cast(klass);
4121 if (vklass->contains_oops()) {
4122 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4123 }
4124 fs.set_flattened(true);
4125 } else {
4126 not_flattened_value_types++;
4127 fs.set_flattened(false);
4128 }
4129 }
4130 }
4131
4132 // Adjusting non_static_oop_count to take into account not flattened value types;
4133 nonstatic_oop_count += not_flattened_value_types;
4134
4135 // Total non-static fields count, including every contended field
4136 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4137 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4138 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4139
4140 const bool super_has_nonstatic_fields =
4141 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4142 const bool has_nonstatic_fields =
4143 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4144 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4145
4146 if (is_value_type() && (!has_nonstatic_fields)) {
4147 // There are a number of fixes required throughout the type system and JIT
4148 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4149 return;
4150 }
4151
4152 // Prepare list of oops for oop map generation.
4153 //
4154 // "offset" and "count" lists are describing the set of contiguous oop
4155 // regions. offset[i] is the start of the i-th region, which then has
4156 // count[i] oops following. Before we know how many regions are required,
4157 // we pessimistically allocate the maps to fit all the oops into the
4158 // distinct regions.
4159 //
4160 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4161 int max_oop_map_count =
4162 super_oop_map_count +
4163 fac->count[NONSTATIC_OOP] +
4164 value_type_oop_map_count +
4165 not_flattened_value_types;
4166
4167 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4168 if (super_oop_map_count > 0) {
4169 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4170 _super_klass->nonstatic_oop_map_count());
4171 }
4172
4173 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4174
4175 bool compact_fields = CompactFields;
4176 int allocation_style = FieldsAllocationStyle;
4177 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4178 assert(false, "0 <= FieldsAllocationStyle <= 2");
4179 allocation_style = 1; // Optimistic
4180 }
4181
4182 // The next classes have predefined hard-coded fields offsets
4183 // (see in JavaClasses::compute_hard_coded_offsets()).
4184 // Use default fields allocation order for them.
4185 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4186 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4187 _class_name == vmSymbols::java_lang_Class() ||
4188 _class_name == vmSymbols::java_lang_ClassLoader() ||
4189 _class_name == vmSymbols::java_lang_ref_Reference() ||
4190 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4191 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4192 _class_name == vmSymbols::java_lang_String() ||
4193 _class_name == vmSymbols::java_lang_Throwable() ||
4194 _class_name == vmSymbols::java_lang_Boolean() ||
4195 _class_name == vmSymbols::java_lang_Character() ||
4196 _class_name == vmSymbols::java_lang_Float() ||
4197 _class_name == vmSymbols::java_lang_Double() ||
4198 _class_name == vmSymbols::java_lang_Byte() ||
4199 _class_name == vmSymbols::java_lang_Short() ||
4200 _class_name == vmSymbols::java_lang_Integer() ||
4201 _class_name == vmSymbols::java_lang_Long())) {
4202 allocation_style = 0; // Allocate oops first
4203 compact_fields = false; // Don't compact fields
4204 }
4205
4206 int next_nonstatic_oop_offset = 0;
4207 int next_nonstatic_double_offset = 0;
4208
4209 // Rearrange fields for a given allocation style
4210 if( allocation_style == 0 ) {
4211 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4212 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4213 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4214 (nonstatic_oop_count * heapOopSize);
4215 } else if( allocation_style == 1 ) {
4216 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4217 next_nonstatic_double_offset = next_nonstatic_field_offset;
4218 } else if( allocation_style == 2 ) {
4219 // Fields allocation: oops fields in super and sub classes are together.
4220 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4221 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4222 allocation_style = 0; // allocate oops first
4223 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4224 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4225 (nonstatic_oop_count * heapOopSize);
4226 }
4227 }
4228 if( allocation_style == 2 ) {
4229 allocation_style = 1; // allocate oops last
4230 next_nonstatic_double_offset = next_nonstatic_field_offset;
4231 }
4232 } else {
4233 ShouldNotReachHere();
4234 }
4235
4236 int nonstatic_oop_space_count = 0;
4237 int nonstatic_word_space_count = 0;
4238 int nonstatic_short_space_count = 0;
4239 int nonstatic_byte_space_count = 0;
4240 int nonstatic_oop_space_offset = 0;
4241 int nonstatic_word_space_offset = 0;
4242 int nonstatic_short_space_offset = 0;
4243 int nonstatic_byte_space_offset = 0;
4244
4245 // Try to squeeze some of the fields into the gaps due to
4246 // long/double alignment.
4247 if (nonstatic_double_count > 0) {
4248 int offset = next_nonstatic_double_offset;
4249 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4250 if (compact_fields && offset != next_nonstatic_double_offset) {
4251 // Allocate available fields into the gap before double field.
4252 int length = next_nonstatic_double_offset - offset;
4253 assert(length == BytesPerInt, "");
4254 nonstatic_word_space_offset = offset;
4255 if (nonstatic_word_count > 0) {
4256 nonstatic_word_count -= 1;
4257 nonstatic_word_space_count = 1; // Only one will fit
4258 length -= BytesPerInt;
4259 offset += BytesPerInt;
4260 }
4261 nonstatic_short_space_offset = offset;
4262 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4263 nonstatic_short_count -= 1;
4264 nonstatic_short_space_count += 1;
4265 length -= BytesPerShort;
4266 offset += BytesPerShort;
4267 }
4268 nonstatic_byte_space_offset = offset;
4269 while (length > 0 && nonstatic_byte_count > 0) {
4270 nonstatic_byte_count -= 1;
4271 nonstatic_byte_space_count += 1;
4272 length -= 1;
4273 }
4274 // Allocate oop field in the gap if there are no other fields for that.
4275 nonstatic_oop_space_offset = offset;
4276 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4277 allocation_style != 0) { // when oop fields not first
4278 nonstatic_oop_count -= 1;
4279 nonstatic_oop_space_count = 1; // Only one will fit
4280 length -= heapOopSize;
4281 offset += heapOopSize;
4282 }
4283 }
4284 }
4285
4286 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4287 (nonstatic_double_count * BytesPerLong);
4288 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4289 (nonstatic_word_count * BytesPerInt);
4290 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4291 (nonstatic_short_count * BytesPerShort);
4292 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4293 nonstatic_byte_count;
4294
4295 // let oops jump before padding with this allocation style
4296 if( allocation_style == 1 ) {
4297 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4298 if( nonstatic_oop_count > 0 ) {
4299 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4300 }
4301 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4302 }
4303
4304 // Aligning embedded value types
4305 // bug below, the current algorithm to layout embedded value types always put them at the
4306 // end of the layout, which doesn't match the different allocation policies the VM is
4307 // supposed to provide => FixMe
4308 // Note also that the current alignment policy is to make each value type starting on a
4309 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4310 // align value types according to their most constrained internal type.
4311 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4312 int next_value_type_index = 0;
4313
4314 // Iterate over fields again and compute correct offsets.
4315 // The field allocation type was temporarily stored in the offset slot.
4316 // oop fields are located before non-oop fields (static and non-static).
4317 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4318
4319 // skip already laid out fields
4320 if (fs.is_offset_set()) continue;
4321
4322 // contended instance fields are handled below
4323 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4324
4325 int real_offset = 0;
4326 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4327
4328 // pack the rest of the fields
4329 switch (atype) {
4330 // Value types in static fields are handled with oops
4331 case STATIC_FLATTENABLE: // Fallthrough
4332 case STATIC_OOP:
4333 real_offset = next_static_oop_offset;
4334 next_static_oop_offset += heapOopSize;
4335 break;
4336 case STATIC_BYTE:
4337 real_offset = next_static_byte_offset;
4338 next_static_byte_offset += 1;
4339 break;
4340 case STATIC_SHORT:
4341 real_offset = next_static_short_offset;
4342 next_static_short_offset += BytesPerShort;
4343 break;
4344 case STATIC_WORD:
4345 real_offset = next_static_word_offset;
4346 next_static_word_offset += BytesPerInt;
4347 break;
4348 case STATIC_DOUBLE:
4349 real_offset = next_static_double_offset;
4350 next_static_double_offset += BytesPerLong;
4351 break;
4352 case NONSTATIC_FLATTENABLE:
4353 if (fs.is_flattened()) {
4354 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4355 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4356 assert(klass->access_flags().is_value_type(),"Must be a value type");
4357 ValueKlass* vklass = ValueKlass::cast(klass);
4358 real_offset = next_nonstatic_valuetype_offset;
4359 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4360 // aligning next value type on a 64 bits boundary
4361 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4362 next_value_type_index += 1;
4363
4364 if (vklass->contains_oops()) { // add flatten oop maps
4365 int diff = real_offset - vklass->first_field_offset();
4366 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4367 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4368 while (map < last_map) {
4369 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4370 map++;
4371 }
4372 }
4373 break;
4374 } else {
4375 // Fall through
4376 }
4377 case NONSTATIC_OOP:
4378 if( nonstatic_oop_space_count > 0 ) {
4379 real_offset = nonstatic_oop_space_offset;
4380 nonstatic_oop_space_offset += heapOopSize;
4381 nonstatic_oop_space_count -= 1;
4382 } else {
4383 real_offset = next_nonstatic_oop_offset;
4384 next_nonstatic_oop_offset += heapOopSize;
4385 }
4386 nonstatic_oop_maps->add(real_offset, 1);
4387 break;
4388 case NONSTATIC_BYTE:
4389 if( nonstatic_byte_space_count > 0 ) {
4390 real_offset = nonstatic_byte_space_offset;
4391 nonstatic_byte_space_offset += 1;
4392 nonstatic_byte_space_count -= 1;
4393 } else {
4394 real_offset = next_nonstatic_byte_offset;
4395 next_nonstatic_byte_offset += 1;
4396 }
4397 break;
4398 case NONSTATIC_SHORT:
4399 if( nonstatic_short_space_count > 0 ) {
4400 real_offset = nonstatic_short_space_offset;
4401 nonstatic_short_space_offset += BytesPerShort;
4402 nonstatic_short_space_count -= 1;
4403 } else {
4404 real_offset = next_nonstatic_short_offset;
4405 next_nonstatic_short_offset += BytesPerShort;
4406 }
4407 break;
4408 case NONSTATIC_WORD:
4409 if( nonstatic_word_space_count > 0 ) {
4410 real_offset = nonstatic_word_space_offset;
4411 nonstatic_word_space_offset += BytesPerInt;
4412 nonstatic_word_space_count -= 1;
4413 } else {
4414 real_offset = next_nonstatic_word_offset;
4415 next_nonstatic_word_offset += BytesPerInt;
4416 }
4417 break;
4418 case NONSTATIC_DOUBLE:
4419 real_offset = next_nonstatic_double_offset;
4420 next_nonstatic_double_offset += BytesPerLong;
4421 break;
4422 default:
4423 ShouldNotReachHere();
4424 }
4425 fs.set_offset(real_offset);
4426 }
4427
4428
4429 // Handle the contended cases.
4430 //
4431 // Each contended field should not intersect the cache line with another contended field.
4432 // In the absence of alignment information, we end up with pessimistically separating
4433 // the fields with full-width padding.
4434 //
4435 // Additionally, this should not break alignment for the fields, so we round the alignment up
4436 // for each field.
4437 if (nonstatic_contended_count > 0) {
4438
4439 // if there is at least one contended field, we need to have pre-padding for them
4440 next_nonstatic_padded_offset += ContendedPaddingWidth;
4441
4442 // collect all contended groups
4443 ResourceBitMap bm(cp->size());
4444 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4445 // skip already laid out fields
4446 if (fs.is_offset_set()) continue;
4447
4448 if (fs.is_contended()) {
4449 bm.set_bit(fs.contended_group());
4450 }
4451 }
4452
4453 int current_group = -1;
4454 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4455
4456 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4457
4458 // skip already laid out fields
4459 if (fs.is_offset_set()) continue;
4460
4461 // skip non-contended fields and fields from different group
4462 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4463
4464 // handle statics below
4465 if (fs.access_flags().is_static()) continue;
4466
4467 int real_offset = 0;
4468 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4469
4470 switch (atype) {
4471 case NONSTATIC_BYTE:
4472 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4473 real_offset = next_nonstatic_padded_offset;
4474 next_nonstatic_padded_offset += 1;
4475 break;
4476
4477 case NONSTATIC_SHORT:
4478 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4479 real_offset = next_nonstatic_padded_offset;
4480 next_nonstatic_padded_offset += BytesPerShort;
4481 break;
4482
4483 case NONSTATIC_WORD:
4484 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4485 real_offset = next_nonstatic_padded_offset;
4486 next_nonstatic_padded_offset += BytesPerInt;
4487 break;
4488
4489 case NONSTATIC_DOUBLE:
4490 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4491 real_offset = next_nonstatic_padded_offset;
4492 next_nonstatic_padded_offset += BytesPerLong;
4493 break;
4494
4495 // Value types in static fields are handled with oops
4496 case NONSTATIC_FLATTENABLE:
4497 throwValueTypeLimitation(THREAD_AND_LOCATION,
4498 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4499 return;
4500
4501 case NONSTATIC_OOP:
4502 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4503 real_offset = next_nonstatic_padded_offset;
4504 next_nonstatic_padded_offset += heapOopSize;
4505 nonstatic_oop_maps->add(real_offset, 1);
4506 break;
4507
4508 default:
4509 ShouldNotReachHere();
4510 }
4511
4512 if (fs.contended_group() == 0) {
4513 // Contended group defines the equivalence class over the fields:
4514 // the fields within the same contended group are not inter-padded.
4515 // The only exception is default group, which does not incur the
4516 // equivalence, and so requires intra-padding.
4517 next_nonstatic_padded_offset += ContendedPaddingWidth;
4518 }
4519
4520 fs.set_offset(real_offset);
4521 } // for
4522
4523 // Start laying out the next group.
4524 // Note that this will effectively pad the last group in the back;
4525 // this is expected to alleviate memory contention effects for
4526 // subclass fields and/or adjacent object.
4527 // If this was the default group, the padding is already in place.
4528 if (current_group != 0) {
4529 next_nonstatic_padded_offset += ContendedPaddingWidth;
4530 }
4531 }
4532
4533 // handle static fields
4534 }
4535
4536 // Entire class is contended, pad in the back.
4537 // This helps to alleviate memory contention effects for subclass fields
4538 // and/or adjacent object.
4539 if (is_contended_class) {
4540 assert(!is_value_type(), "@Contended not supported for value types yet");
4541 next_nonstatic_padded_offset += ContendedPaddingWidth;
4542 }
4543
4544 int notaligned_nonstatic_fields_end;
4545 if (nonstatic_value_type_count != 0) {
4546 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4547 } else {
4548 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4549 }
4550
4551 int nonstatic_field_sz_align = heapOopSize;
4552 if (is_value_type()) {
4553 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4554 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4555 }
4556 }
4557 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4558 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4559 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4560
4561 int static_field_size = (static_fields_end -
4562 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4563 nonstatic_field_size = nonstatic_field_size +
4564 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4565
4566 int instance_size = align_object_size(instance_end / wordSize);
4567
4568 assert(instance_size == align_object_size(align_up(
4569 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4570 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4571
4572
4573 // Invariant: nonstatic_field end/start should only change if there are
4574 // nonstatic fields in the class, or if the class is contended. We compare
4575 // against the non-aligned value, so that end alignment will not fail the
4576 // assert without actually having the fields.
4577 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4578 is_contended_class ||
4579 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4580
4581 // Number of non-static oop map blocks allocated at end of klass.
4582 nonstatic_oop_maps->compact(THREAD);
4583
4584 #ifndef PRODUCT
4585 if ((PrintFieldLayout && !is_value_type()) ||
4586 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4587 print_field_layout(_class_name,
4588 _fields,
4589 cp,
4590 instance_size,
4591 nonstatic_fields_start,
4592 nonstatic_fields_end,
4593 static_fields_end);
4594 nonstatic_oop_maps->print_on(tty);
4595 tty->print("\n");
4596 tty->print_cr("Instance size = %d", instance_size);
4597 tty->print_cr("Nonstatic_field_size = %d", nonstatic_field_size);
4598 tty->print_cr("Static_field_size = %d", static_field_size);
4599 tty->print_cr("Has nonstatic fields = %d", has_nonstatic_fields);
4600 tty->print_cr("---");
4601 }
4602
4603 #endif
4604 // Pass back information needed for InstanceKlass creation
4605 info->oop_map_blocks = nonstatic_oop_maps;
4606 info->instance_size = instance_size;
4607 info->static_field_size = static_field_size;
4608 info->nonstatic_field_size = nonstatic_field_size;
4609 info->has_nonstatic_fields = has_nonstatic_fields;
4610 }
4611
4612 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4613 assert(ik != NULL, "invariant");
4614
4615 const Klass* const super = ik->super();
4616
4617 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4618 // in which case we don't have to register objects as finalizable
4619 if (!_has_empty_finalizer) {
4620 if (_has_finalizer ||
4621 (super != NULL && super->has_finalizer())) {
4622 ik->set_has_finalizer();
4623 }
4624 }
4625
4626 #ifdef ASSERT
4627 bool f = false;
4628 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4629 vmSymbols::void_method_signature());
4630 if (m != NULL && !m->is_empty_method()) {
4631 f = true;
4632 }
4633
4634 // Spec doesn't prevent agent from redefinition of empty finalizer.
4635 // Despite the fact that it's generally bad idea and redefined finalizer
4636 // will not work as expected we shouldn't abort vm in this case
4637 if (!ik->has_redefined_this_or_super()) {
4638 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4639 }
4640 #endif
4641
4642 // Check if this klass supports the java.lang.Cloneable interface
4643 if (SystemDictionary::Cloneable_klass_loaded()) {
4644 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4645 if (ik->is_value()) {
4646 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4647 return;
4648 }
4649 ik->set_is_cloneable();
4650 }
4651 }
4652
4653 // Check if this klass has a vanilla default constructor
4654 if (super == NULL) {
4655 // java.lang.Object has empty default constructor
4656 ik->set_has_vanilla_constructor();
4657 } else {
4658 if (super->has_vanilla_constructor() &&
4659 _has_vanilla_constructor) {
4660 ik->set_has_vanilla_constructor();
4661 }
4662 #ifdef ASSERT
4663 bool v = false;
4664 if (super->has_vanilla_constructor()) {
4665 const Method* const constructor =
4666 ik->find_method(vmSymbols::object_initializer_name(),
4667 vmSymbols::void_method_signature());
4668 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4669 v = true;
4670 }
4671 }
4672 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4673 #endif
4674 }
4675
4676 // If it cannot be fast-path allocated, set a bit in the layout helper.
4677 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4678 assert(ik->size_helper() > 0, "layout_helper is initialized");
4679 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4680 || ik->is_abstract() || ik->is_interface()
4681 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4682 || ik->size_helper() >= FastAllocateSizeLimit) {
4683 // Forbid fast-path allocation.
4684 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4685 ik->set_layout_helper(lh);
4686 }
4687 }
4688
4689 bool ClassFileParser::supports_value_types() const {
4690 // Value types are only supported by class file version 55 and later
4691 return _major_version >= JAVA_11_VERSION;
4692 }
4693
4694 // utility methods for appending an array with check for duplicates
4695
4696 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4697 const Array<InstanceKlass*>* const ifs) {
4698 // iterate over new interfaces
4699 for (int i = 0; i < ifs->length(); i++) {
4700 InstanceKlass* const e = ifs->at(i);
4701 assert(e->is_klass() && e->is_interface(), "just checking");
4702 // add new interface
4703 result->append_if_missing(e);
4704 }
4705 }
4706
4707 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4708 Array<InstanceKlass*>* local_ifs,
4709 ClassLoaderData* loader_data,
4710 TRAPS) {
4711 assert(local_ifs != NULL, "invariant");
4712 assert(loader_data != NULL, "invariant");
4713
4714 // Compute maximum size for transitive interfaces
4715 int max_transitive_size = 0;
4716 int super_size = 0;
4717 // Add superclass transitive interfaces size
4718 if (super != NULL) {
4719 super_size = super->transitive_interfaces()->length();
4720 max_transitive_size += super_size;
4721 }
4722 // Add local interfaces' super interfaces
4723 const int local_size = local_ifs->length();
4724 for (int i = 0; i < local_size; i++) {
4725 InstanceKlass* const l = local_ifs->at(i);
4726 max_transitive_size += l->transitive_interfaces()->length();
4727 }
4728 // Finally add local interfaces
4729 max_transitive_size += local_size;
4730 // Construct array
4731 if (max_transitive_size == 0) {
4732 // no interfaces, use canonicalized array
4733 return Universe::the_empty_instance_klass_array();
4734 } else if (max_transitive_size == super_size) {
4735 // no new local interfaces added, share superklass' transitive interface array
4736 return super->transitive_interfaces();
4737 } else if (max_transitive_size == local_size) {
4738 // only local interfaces added, share local interface array
4739 return local_ifs;
4740 } else {
4741 ResourceMark rm;
4742 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4743
4744 // Copy down from superclass
4745 if (super != NULL) {
4746 append_interfaces(result, super->transitive_interfaces());
4747 }
4748
4749 // Copy down from local interfaces' superinterfaces
4750 for (int i = 0; i < local_size; i++) {
4751 InstanceKlass* const l = local_ifs->at(i);
4752 append_interfaces(result, l->transitive_interfaces());
4753 }
4754 // Finally add local interfaces
4755 append_interfaces(result, local_ifs);
4756
4757 // length will be less than the max_transitive_size if duplicates were removed
4758 const int length = result->length();
4759 assert(length <= max_transitive_size, "just checking");
4760 Array<InstanceKlass*>* const new_result =
4761 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4762 for (int i = 0; i < length; i++) {
4763 InstanceKlass* const e = result->at(i);
4764 assert(e != NULL, "just checking");
4765 new_result->at_put(i, e);
4766 }
4767 return new_result;
4768 }
4769 }
4770
4771 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4772 assert(this_klass != NULL, "invariant");
4773 const Klass* const super = this_klass->super();
4774 if (super != NULL) {
4775
4776 // If the loader is not the boot loader then throw an exception if its
4777 // superclass is in package jdk.internal.reflect and its loader is not a
4778 // special reflection class loader
4779 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4780 assert(super->is_instance_klass(), "super is not instance klass");
4781 PackageEntry* super_package = super->package();
4782 if (super_package != NULL &&
4783 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4784 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4785 ResourceMark rm(THREAD);
4786 Exceptions::fthrow(
4787 THREAD_AND_LOCATION,
4788 vmSymbols::java_lang_IllegalAccessError(),
4789 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4790 this_klass->external_name(),
4791 this_klass->class_loader_data()->loader_name_and_id(),
4792 super->external_name());
4793 return;
4794 }
4795 }
4796
4797 Reflection::VerifyClassAccessResults vca_result =
4798 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4799 if (vca_result != Reflection::ACCESS_OK) {
4800 ResourceMark rm(THREAD);
4801 char* msg = Reflection::verify_class_access_msg(this_klass,
4802 InstanceKlass::cast(super),
4803 vca_result);
4804 if (msg == NULL) {
4805 bool same_module = (this_klass->module() == super->module());
4806 Exceptions::fthrow(
4807 THREAD_AND_LOCATION,
4808 vmSymbols::java_lang_IllegalAccessError(),
4809 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4810 this_klass->external_name(),
4811 super->is_abstract() ? "abstract " : "",
4812 super->external_name(),
4813 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4814 (same_module) ? "" : "; ",
4815 (same_module) ? "" : super->class_in_module_of_loader());
4816 } else {
4817 // Add additional message content.
4818 Exceptions::fthrow(
4819 THREAD_AND_LOCATION,
4820 vmSymbols::java_lang_IllegalAccessError(),
4821 "superclass access check failed: %s",
4822 msg);
4823 }
4824 }
4825 }
4826 }
4827
4828
4829 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4830 assert(this_klass != NULL, "invariant");
4831 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4832 const int lng = local_interfaces->length();
4833 for (int i = lng - 1; i >= 0; i--) {
4834 InstanceKlass* const k = local_interfaces->at(i);
4835 assert (k != NULL && k->is_interface(), "invalid interface");
4836 Reflection::VerifyClassAccessResults vca_result =
4837 Reflection::verify_class_access(this_klass, k, false);
4838 if (vca_result != Reflection::ACCESS_OK) {
4839 ResourceMark rm(THREAD);
4840 char* msg = Reflection::verify_class_access_msg(this_klass,
4841 k,
4842 vca_result);
4843 if (msg == NULL) {
4844 bool same_module = (this_klass->module() == k->module());
4845 Exceptions::fthrow(
4846 THREAD_AND_LOCATION,
4847 vmSymbols::java_lang_IllegalAccessError(),
4848 "class %s cannot access its superinterface %s (%s%s%s)",
4849 this_klass->external_name(),
4850 k->external_name(),
4851 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4852 (same_module) ? "" : "; ",
4853 (same_module) ? "" : k->class_in_module_of_loader());
4854 } else {
4855 // Add additional message content.
4856 Exceptions::fthrow(
4857 THREAD_AND_LOCATION,
4858 vmSymbols::java_lang_IllegalAccessError(),
4859 "superinterface check failed: %s",
4860 msg);
4861 }
4862 }
4863 }
4864 }
4865
4866
4867 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4868 assert(this_klass != NULL, "invariant");
4869 const Array<Method*>* const methods = this_klass->methods();
4870 const int num_methods = methods->length();
4871
4872 // go thru each method and check if it overrides a final method
4873 for (int index = 0; index < num_methods; index++) {
4874 const Method* const m = methods->at(index);
4875
4876 // skip private, static, and <init> methods
4877 if ((!m->is_private() && !m->is_static()) &&
4878 (m->name() != vmSymbols::object_initializer_name())) {
4879
4880 const Symbol* const name = m->name();
4881 const Symbol* const signature = m->signature();
4882 const Klass* k = this_klass->super();
4883 const Method* super_m = NULL;
4884 while (k != NULL) {
4885 // skip supers that don't have final methods.
4886 if (k->has_final_method()) {
4887 // lookup a matching method in the super class hierarchy
4888 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4889 if (super_m == NULL) {
4890 break; // didn't find any match; get out
4891 }
4892
4893 if (super_m->is_final() && !super_m->is_static() &&
4894 !super_m->access_flags().is_private()) {
4895 // matching method in super is final, and not static or private
4896 bool can_access = Reflection::verify_member_access(this_klass,
4897 super_m->method_holder(),
4898 super_m->method_holder(),
4899 super_m->access_flags(),
4900 false, false, CHECK);
4901 if (can_access) {
4902 // this class can access super final method and therefore override
4903 ResourceMark rm(THREAD);
4904 Exceptions::fthrow(THREAD_AND_LOCATION,
4905 vmSymbols::java_lang_VerifyError(),
4906 "class %s overrides final method %s.%s%s",
4907 this_klass->external_name(),
4908 super_m->method_holder()->external_name(),
4909 name->as_C_string(),
4910 signature->as_C_string()
4911 );
4912 return;
4913 }
4914 }
4915
4916 // continue to look from super_m's holder's super.
4917 k = super_m->method_holder()->super();
4918 continue;
4919 }
4920
4921 k = k->super();
4922 }
4923 }
4924 }
4925 }
4926
4927
4928 // assumes that this_klass is an interface
4929 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4930 assert(this_klass != NULL, "invariant");
4931 assert(this_klass->is_interface(), "not an interface");
4932 const Array<Method*>* methods = this_klass->methods();
4933 const int num_methods = methods->length();
4934
4935 for (int index = 0; index < num_methods; index++) {
4936 const Method* const m = methods->at(index);
4937 // if m is static and not the init method, throw a verify error
4938 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4939 ResourceMark rm(THREAD);
4940 Exceptions::fthrow(
4941 THREAD_AND_LOCATION,
4942 vmSymbols::java_lang_VerifyError(),
4943 "Illegal static method %s in interface %s",
4944 m->name()->as_C_string(),
4945 this_klass->external_name()
4946 );
4947 return;
4948 }
4949 }
4950 }
4951
4952 // utility methods for format checking
4953
4954 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4955 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4956 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4957 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4958 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4959 if (is_module) {
4960 ResourceMark rm(THREAD);
4961 Exceptions::fthrow(
4962 THREAD_AND_LOCATION,
4963 vmSymbols::java_lang_NoClassDefFoundError(),
4964 "%s is not a class because access_flag ACC_MODULE is set",
4965 _class_name->as_C_string());
4966 return;
4967 }
4968
4969 if (is_value_type && !EnableValhalla) {
4970 ResourceMark rm(THREAD);
4971 Exceptions::fthrow(
4972 THREAD_AND_LOCATION,
4973 vmSymbols::java_lang_ClassFormatError(),
4974 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4975 _class_name->as_C_string()
4976 );
4977 }
4978
4979 if (!_need_verify) { return; }
4980
4981 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4982 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4983 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4984 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4985 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4986 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4987 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4988
4989 if ((is_abstract && is_final) ||
4990 (is_interface && !is_abstract) ||
4991 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4992 (!is_interface && major_gte_15 && is_annotation) ||
4993 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
4994 ResourceMark rm(THREAD);
4995 const char* class_note = "";
4996 if (is_value_type) class_note = " (an inline class)";
4997 Exceptions::fthrow(
4998 THREAD_AND_LOCATION,
4999 vmSymbols::java_lang_ClassFormatError(),
5000 "Illegal class modifiers in class %s%s: 0x%X",
5001 _class_name->as_C_string(), class_note, flags
5002 );
5003 return;
5004 }
5005 }
5006
5007 static bool has_illegal_visibility(jint flags) {
5008 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5009 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5010 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5011
5012 return ((is_public && is_protected) ||
5013 (is_public && is_private) ||
5014 (is_protected && is_private));
5015 }
5016
5017 // A legal major_version.minor_version must be one of the following:
5018 //
5019 // Major_version >= 45 and major_version < 56, any minor_version.
5020 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
5021 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
5022 //
5023 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5024 ResourceMark rm(THREAD);
5025 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5026 if (major < JAVA_MIN_SUPPORTED_VERSION) {
5027 Exceptions::fthrow(
5028 THREAD_AND_LOCATION,
5029 vmSymbols::java_lang_UnsupportedClassVersionError(),
5030 "%s (class file version %u.%u) was compiled with an invalid major version",
5031 class_name->as_C_string(), major, minor);
5032 return;
5033 }
5034
5035 if (major > max_version) {
5036 Exceptions::fthrow(
5037 THREAD_AND_LOCATION,
5038 vmSymbols::java_lang_UnsupportedClassVersionError(),
5039 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5040 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5041 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5042 return;
5043 }
5044
5045 if (major < JAVA_12_VERSION || minor == 0) {
5046 return;
5047 }
5048
5049 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5050 if (major != max_version) {
5051 Exceptions::fthrow(
5052 THREAD_AND_LOCATION,
5053 vmSymbols::java_lang_UnsupportedClassVersionError(),
5054 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5055 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5056 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5057 return;
5058 }
5059
5060 if (!Arguments::enable_preview()) {
5061 Exceptions::fthrow(
5062 THREAD_AND_LOCATION,
5063 vmSymbols::java_lang_UnsupportedClassVersionError(),
5064 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5065 class_name->as_C_string(), major, minor);
5066 return;
5067 }
5068
5069 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5070 Exceptions::fthrow(
5071 THREAD_AND_LOCATION,
5072 vmSymbols::java_lang_UnsupportedClassVersionError(),
5073 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5074 class_name->as_C_string(), major, minor);
5075 }
5076 }
5077
5078 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5079 bool is_interface,
5080 bool is_value_type,
5081 TRAPS) const {
5082 if (!_need_verify) { return; }
5083
5084 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5085 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5086 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5087 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5088 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5089 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5090 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5091 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5092 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5093
5094 bool is_illegal = false;
5095
5096 if (is_interface) {
5097 if (!is_public || !is_static || !is_final || is_private ||
5098 is_protected || is_volatile || is_transient ||
5099 (major_gte_15 && is_enum)) {
5100 is_illegal = true;
5101 }
5102 } else { // not interface
5103 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5104 is_illegal = true;
5105 } else {
5106 if (is_value_type && !is_static && !is_final) {
5107 is_illegal = true;
5108 }
5109 }
5110 }
5111
5112 if (is_illegal) {
5113 ResourceMark rm(THREAD);
5114 Exceptions::fthrow(
5115 THREAD_AND_LOCATION,
5116 vmSymbols::java_lang_ClassFormatError(),
5117 "Illegal field modifiers in class %s: 0x%X",
5118 _class_name->as_C_string(), flags);
5119 return;
5120 }
5121 }
5122
5123 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5124 bool is_interface,
5125 bool is_value_type,
5126 const Symbol* name,
5127 TRAPS) const {
5128 if (!_need_verify) { return; }
5129
5130 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5131 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5132 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5133 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5134 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5135 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5136 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5137 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5138 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5139 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5140 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5141 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5142 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5143
5144 bool is_illegal = false;
5145
5146 const char* class_note = "";
5147
5148 if (is_interface) {
5149 if (major_gte_8) {
5150 // Class file version is JAVA_8_VERSION or later Methods of
5151 // interfaces may set any of the flags except ACC_PROTECTED,
5152 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5153 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5154 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5155 (is_native || is_protected || is_final || is_synchronized) ||
5156 // If a specific method of a class or interface has its
5157 // ACC_ABSTRACT flag set, it must not have any of its
5158 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5159 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5160 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5161 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5162 (is_abstract && (is_private || is_static || is_strict))) {
5163 is_illegal = true;
5164 }
5165 } else if (major_gte_15) {
5166 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5167 if (!is_public || is_private || is_protected || is_static || is_final ||
5168 is_synchronized || is_native || !is_abstract || is_strict) {
5169 is_illegal = true;
5170 }
5171 } else {
5172 // Class file version is pre-JAVA_1_5_VERSION
5173 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5174 is_illegal = true;
5175 }
5176 }
5177 } else { // not interface
5178 if (has_illegal_visibility(flags)) {
5179 is_illegal = true;
5180 } else {
5181 if (is_initializer) {
5182 if (is_final || is_synchronized || is_native ||
5183 is_abstract || (major_gte_15 && is_bridge)) {
5184 is_illegal = true;
5185 }
5186 if (!is_static && !is_value_type) {
5187 // OK, an object constructor in a regular class
5188 } else if (is_static && is_value_type) {
5189 // OK, a static init factory in an inline class
5190 } else {
5191 // but no other combinations are allowed
5192 is_illegal = true;
5193 class_note = (is_value_type ? " (an inline class)" : " (not an inline class)");
5194 }
5195 } else { // not initializer
5196 if (is_value_type && is_synchronized && !is_static) {
5197 is_illegal = true;
5198 class_note = " (an inline class)";
5199 } else {
5200 if (is_abstract) {
5201 if ((is_final || is_native || is_private || is_static ||
5202 (major_gte_15 && (is_synchronized || is_strict)))) {
5203 is_illegal = true;
5204 }
5205 }
5206 }
5207 }
5208 }
5209 }
5210
5211 if (is_illegal) {
5212 ResourceMark rm(THREAD);
5213 Exceptions::fthrow(
5214 THREAD_AND_LOCATION,
5215 vmSymbols::java_lang_ClassFormatError(),
5216 "Method %s in class %s%s has illegal modifiers: 0x%X",
5217 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
5218 return;
5219 }
5220 }
5221
5222 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5223 int length,
5224 TRAPS) const {
5225 assert(_need_verify, "only called when _need_verify is true");
5226 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5227 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5228 }
5229 }
5230
5231 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5232 // In class names, '/' separates unqualified names. This is verified in this function also.
5233 // Method names also may not contain the characters '<' or '>', unless <init>
5234 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5235 // method. Because these names have been checked as special cases before
5236 // calling this method in verify_legal_method_name.
5237 //
5238 // This method is also called from the modular system APIs in modules.cpp
5239 // to verify the validity of module and package names.
5240 bool ClassFileParser::verify_unqualified_name(const char* name,
5241 unsigned int length,
5242 int type) {
5243 if (length == 0) return false; // Must have at least one char.
5244 for (const char* p = name; p != name + length; p++) {
5245 switch(*p) {
5246 case '.':
5247 case ';':
5248 case '[':
5249 // do not permit '.', ';', or '['
5250 return false;
5251 case '/':
5252 // check for '//' or leading or trailing '/' which are not legal
5253 // unqualified name must not be empty
5254 if (type == ClassFileParser::LegalClass) {
5255 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5256 return false;
5257 }
5258 } else {
5259 return false; // do not permit '/' unless it's class name
5260 }
5261 break;
5262 case '<':
5263 case '>':
5264 // do not permit '<' or '>' in method names
5265 if (type == ClassFileParser::LegalMethod) {
5266 return false;
5267 }
5268 }
5269 }
5270 return true;
5271 }
5272
5273 // Take pointer to a UTF8 byte string (not NUL-terminated).
5274 // Skip over the longest part of the string that could
5275 // be taken as a fieldname. Allow '/' if slash_ok is true.
5276 // Return a pointer to just past the fieldname.
5277 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5278 // being true, we saw consecutive slashes (meaning we were looking for a
5279 // qualified path but found something that was badly-formed).
5280 static const char* skip_over_field_name(const char* const name,
5281 bool slash_ok,
5282 unsigned int length) {
5283 const char* p;
5284 jboolean last_is_slash = false;
5285 jboolean not_first_ch = false;
5286
5287 for (p = name; p != name + length; not_first_ch = true) {
5288 const char* old_p = p;
5289 jchar ch = *p;
5290 if (ch < 128) {
5291 p++;
5292 // quick check for ascii
5293 if ((ch >= 'a' && ch <= 'z') ||
5294 (ch >= 'A' && ch <= 'Z') ||
5295 (ch == '_' || ch == '$') ||
5296 (not_first_ch && ch >= '0' && ch <= '9')) {
5297 last_is_slash = false;
5298 continue;
5299 }
5300 if (slash_ok && ch == '/') {
5301 if (last_is_slash) {
5302 return NULL; // Don't permit consecutive slashes
5303 }
5304 last_is_slash = true;
5305 continue;
5306 }
5307 }
5308 else {
5309 jint unicode_ch;
5310 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5311 p = tmp_p;
5312 last_is_slash = false;
5313 // Check if ch is Java identifier start or is Java identifier part
5314 // 4672820: call java.lang.Character methods directly without generating separate tables.
5315 EXCEPTION_MARK;
5316 // return value
5317 JavaValue result(T_BOOLEAN);
5318 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5319 JavaCallArguments args;
5320 args.push_int(unicode_ch);
5321
5322 if (not_first_ch) {
5323 // public static boolean isJavaIdentifierPart(char ch);
5324 JavaCalls::call_static(&result,
5325 SystemDictionary::Character_klass(),
5326 vmSymbols::isJavaIdentifierPart_name(),
5327 vmSymbols::int_bool_signature(),
5328 &args,
5329 THREAD);
5330 } else {
5331 // public static boolean isJavaIdentifierStart(char ch);
5332 JavaCalls::call_static(&result,
5333 SystemDictionary::Character_klass(),
5334 vmSymbols::isJavaIdentifierStart_name(),
5335 vmSymbols::int_bool_signature(),
5336 &args,
5337 THREAD);
5338 }
5339 if (HAS_PENDING_EXCEPTION) {
5340 CLEAR_PENDING_EXCEPTION;
5341 return NULL;
5342 }
5343 if(result.get_jboolean()) {
5344 continue;
5345 }
5346 }
5347 return (not_first_ch) ? old_p : NULL;
5348 }
5349 return (not_first_ch) ? p : NULL;
5350 }
5351
5352 // Take pointer to a UTF8 byte string (not NUL-terminated).
5353 // Skip over the longest part of the string that could
5354 // be taken as a field signature. Allow "void" if void_ok.
5355 // Return a pointer to just past the signature.
5356 // Return NULL if no legal signature is found.
5357 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5358 bool void_ok,
5359 unsigned int length,
5360 TRAPS) const {
5361 unsigned int array_dim = 0;
5362 while (length > 0) {
5363 switch (signature[0]) {
5364 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5365 case JVM_SIGNATURE_BOOLEAN:
5366 case JVM_SIGNATURE_BYTE:
5367 case JVM_SIGNATURE_CHAR:
5368 case JVM_SIGNATURE_SHORT:
5369 case JVM_SIGNATURE_INT:
5370 case JVM_SIGNATURE_FLOAT:
5371 case JVM_SIGNATURE_LONG:
5372 case JVM_SIGNATURE_DOUBLE:
5373 return signature + 1;
5374 case JVM_SIGNATURE_VALUETYPE:
5375 // Can't enable this check until JDK upgrades the bytecode generators
5376 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5377 // classfile_parse_error("Class name contains illegal Q-signature "
5378 // "in descriptor in class file %s",
5379 // CHECK_0);
5380 // }
5381 // fall through
5382 case JVM_SIGNATURE_CLASS:
5383 {
5384 if (_major_version < JAVA_1_5_VERSION) {
5385 // Skip over the class name if one is there
5386 const char* const p = skip_over_field_name(signature + 1, true, --length);
5387
5388 // The next character better be a semicolon
5389 if (p && (p - signature) > 1 && p[0] == ';') {
5390 return p + 1;
5391 }
5392 }
5393 else {
5394 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5395 signature++;
5396 const char* c = (const char*) memchr(signature, ';', length - 1);
5397 // Format check signature
5398 if (c != NULL) {
5399 int newlen = c - (char*) signature;
5400 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5401 if (!legal) {
5402 classfile_parse_error("Class name is empty or contains illegal character "
5403 "in descriptor in class file %s",
5404 CHECK_0);
5405 return NULL;
5406 }
5407 return signature + newlen + 1;
5408 }
5409 }
5410 return NULL;
5411 }
5412 case JVM_SIGNATURE_ARRAY:
5413 array_dim++;
5414 if (array_dim > 255) {
5415 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5416 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5417 }
5418 // The rest of what's there better be a legal signature
5419 signature++;
5420 length--;
5421 void_ok = false;
5422 break;
5423 default:
5424 return NULL;
5425 }
5426 }
5427 return NULL;
5428 }
5429
5430 // Checks if name is a legal class name.
5431 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5432 if (!_need_verify || _relax_verify) { return; }
5433
5434 assert(name->refcount() > 0, "symbol must be kept alive");
5435 char* bytes = (char*)name->bytes();
5436 unsigned int length = name->utf8_length();
5437 bool legal = false;
5438
5439 if (length > 0) {
5440 const char* p;
5441 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5442 p = skip_over_field_signature(bytes, false, length, CHECK);
5443 legal = (p != NULL) && ((p - bytes) == (int)length);
5444 } else if (_major_version < JAVA_1_5_VERSION) {
5445 if (bytes[0] != '<') {
5446 p = skip_over_field_name(bytes, true, length);
5447 legal = (p != NULL) && ((p - bytes) == (int)length);
5448 }
5449 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5450 // Support for L...; and Q...; descriptors
5451 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5452 } else {
5453 // 4900761: relax the constraints based on JSR202 spec
5454 // Class names may be drawn from the entire Unicode character set.
5455 // Identifiers between '/' must be unqualified names.
5456 // The utf8 string has been verified when parsing cpool entries.
5457 legal = verify_unqualified_name(bytes, length, LegalClass);
5458 }
5459 }
5460 if (!legal) {
5461 ResourceMark rm(THREAD);
5462 assert(_class_name != NULL, "invariant");
5463 Exceptions::fthrow(
5464 THREAD_AND_LOCATION,
5465 vmSymbols::java_lang_ClassFormatError(),
5466 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5467 _class_name->as_C_string()
5468 );
5469 return;
5470 }
5471 }
5472
5473 // Checks if name is a legal field name.
5474 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5475 if (!_need_verify || _relax_verify) { return; }
5476
5477 char* bytes = (char*)name->bytes();
5478 unsigned int length = name->utf8_length();
5479 bool legal = false;
5480
5481 if (length > 0) {
5482 if (_major_version < JAVA_1_5_VERSION) {
5483 if (bytes[0] != '<') {
5484 const char* p = skip_over_field_name(bytes, false, length);
5485 legal = (p != NULL) && ((p - bytes) == (int)length);
5486 }
5487 } else {
5488 // 4881221: relax the constraints based on JSR202 spec
5489 legal = verify_unqualified_name(bytes, length, LegalField);
5490 }
5491 }
5492
5493 if (!legal) {
5494 ResourceMark rm(THREAD);
5495 assert(_class_name != NULL, "invariant");
5496 Exceptions::fthrow(
5497 THREAD_AND_LOCATION,
5498 vmSymbols::java_lang_ClassFormatError(),
5499 "Illegal field name \"%.*s\" in class %s", length, bytes,
5500 _class_name->as_C_string()
5501 );
5502 return;
5503 }
5504 }
5505
5506 // Checks if name is a legal method name.
5507 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5508 if (!_need_verify || _relax_verify) { return; }
5509
5510 assert(name != NULL, "method name is null");
5511 char* bytes = (char*)name->bytes();
5512 unsigned int length = name->utf8_length();
5513 bool legal = false;
5514
5515 if (length > 0) {
5516 if (bytes[0] == '<') {
5517 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5518 legal = true;
5519 }
5520 } else if (_major_version < JAVA_1_5_VERSION) {
5521 const char* p;
5522 p = skip_over_field_name(bytes, false, length);
5523 legal = (p != NULL) && ((p - bytes) == (int)length);
5524 } else {
5525 // 4881221: relax the constraints based on JSR202 spec
5526 legal = verify_unqualified_name(bytes, length, LegalMethod);
5527 }
5528 }
5529
5530 if (!legal) {
5531 ResourceMark rm(THREAD);
5532 assert(_class_name != NULL, "invariant");
5533 Exceptions::fthrow(
5534 THREAD_AND_LOCATION,
5535 vmSymbols::java_lang_ClassFormatError(),
5536 "Illegal method name \"%.*s\" in class %s", length, bytes,
5537 _class_name->as_C_string()
5538 );
5539 return;
5540 }
5541 }
5542
5543
5544 // Checks if signature is a legal field signature.
5545 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5546 const Symbol* signature,
5547 TRAPS) const {
5548 if (!_need_verify) { return; }
5549
5550 const char* const bytes = (const char* const)signature->bytes();
5551 const unsigned int length = signature->utf8_length();
5552 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5553
5554 if (p == NULL || (p - bytes) != (int)length) {
5555 throwIllegalSignature("Field", name, signature, CHECK);
5556 }
5557 }
5558
5559 // Checks if signature is a legal method signature.
5560 // Returns number of parameters
5561 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5562 const Symbol* signature,
5563 TRAPS) const {
5564 if (!_need_verify) {
5565 // make sure caller's args_size will be less than 0 even for non-static
5566 // method so it will be recomputed in compute_size_of_parameters().
5567 return -2;
5568 }
5569
5570 // Class initializers cannot have args for class format version >= 51.
5571 if (name == vmSymbols::class_initializer_name() &&
5572 signature != vmSymbols::void_method_signature() &&
5573 _major_version >= JAVA_7_VERSION) {
5574 throwIllegalSignature("Method", name, signature, CHECK_0);
5575 return 0;
5576 }
5577
5578 unsigned int args_size = 0;
5579 const char* p = (const char*)signature->bytes();
5580 unsigned int length = signature->utf8_length();
5581 const char* nextp;
5582
5583 // The first character must be a '('
5584 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5585 length--;
5586 // Skip over legal field signatures
5587 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5588 while ((length > 0) && (nextp != NULL)) {
5589 args_size++;
5590 if (p[0] == 'J' || p[0] == 'D') {
5591 args_size++;
5592 }
5593 length -= nextp - p;
5594 p = nextp;
5595 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5596 }
5597 // The first non-signature thing better be a ')'
5598 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5599 length--;
5600 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5601 // All constructor methods must return void
5602 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5603 return args_size;
5604 }
5605 // All static init methods must return the current class
5606 if ((length >= 3) && (p[length-1] == JVM_SIGNATURE_ENDCLASS)
5607 && name == vmSymbols::object_initializer_name()) {
5608 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5609 if (nextp && ((int)length == (nextp - p))) {
5610 // The actual class will be checked against current class
5611 // when the method is defined (see parse_method).
5612 // A reference to a static init with a bad return type
5613 // will load and verify OK, but will fail to link.
5614 return args_size;
5615 }
5616 }
5617 // The distinction between static factory methods and
5618 // constructors depends on the JVM_ACC_STATIC modifier.
5619 // This distinction must be reflected in a void or non-void
5620 // return. For declared methods, the check is in parse_method.
5621 } else {
5622 // Now we better just have a return value
5623 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5624 if (nextp && ((int)length == (nextp - p))) {
5625 return args_size;
5626 }
5627 }
5628 }
5629 }
5630 // Report error
5631 throwIllegalSignature("Method", name, signature, CHECK_0);
5632 return 0;
5633 }
5634
5635 int ClassFileParser::static_field_size() const {
5636 assert(_field_info != NULL, "invariant");
5637 return _field_info->static_field_size;
5638 }
5639
5640 int ClassFileParser::total_oop_map_count() const {
5641 assert(_field_info != NULL, "invariant");
5642 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5643 }
5644
5645 jint ClassFileParser::layout_size() const {
5646 assert(_field_info != NULL, "invariant");
5647 return _field_info->instance_size;
5648 }
5649
5650 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5651 const Array<Method*>* methods) {
5652 assert(ik != NULL, "invariant");
5653 assert(methods != NULL, "invariant");
5654
5655 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5656 // (We used to do this lazily, but now we query it in Rewriter,
5657 // which is eagerly done for every method, so we might as well do it now,
5658 // when everything is fresh in memory.)
5659 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5660
5661 if (klass_id != vmSymbols::NO_SID) {
5662 for (int j = 0; j < methods->length(); ++j) {
5663 Method* method = methods->at(j);
5664 method->init_intrinsic_id();
5665
5666 if (CheckIntrinsics) {
5667 // Check if an intrinsic is defined for method 'method',
5668 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5669 if (method->intrinsic_id() != vmIntrinsics::_none &&
5670 !method->intrinsic_candidate()) {
5671 tty->print("Compiler intrinsic is defined for method [%s], "
5672 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5673 method->name_and_sig_as_C_string(),
5674 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5675 );
5676 tty->cr();
5677 DEBUG_ONLY(vm_exit(1));
5678 }
5679 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5680 // but there is no intrinsic available for it.
5681 if (method->intrinsic_candidate() &&
5682 method->intrinsic_id() == vmIntrinsics::_none) {
5683 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5684 "but no compiler intrinsic is defined for the method.%s",
5685 method->name_and_sig_as_C_string(),
5686 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5687 );
5688 tty->cr();
5689 DEBUG_ONLY(vm_exit(1));
5690 }
5691 }
5692 } // end for
5693
5694 #ifdef ASSERT
5695 if (CheckIntrinsics) {
5696 // Check for orphan methods in the current class. A method m
5697 // of a class C is orphan if an intrinsic is defined for method m,
5698 // but class C does not declare m.
5699 // The check is potentially expensive, therefore it is available
5700 // only in debug builds.
5701
5702 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5703 if (vmIntrinsics::_compiledLambdaForm == id) {
5704 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5705 // generated for the JVM from a LambdaForm and therefore no method
5706 // is defined for it.
5707 continue;
5708 }
5709
5710 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5711 // Check if the current class contains a method with the same
5712 // name, flags, signature.
5713 bool match = false;
5714 for (int j = 0; j < methods->length(); ++j) {
5715 const Method* method = methods->at(j);
5716 if (method->intrinsic_id() == id) {
5717 match = true;
5718 break;
5719 }
5720 }
5721
5722 if (!match) {
5723 char buf[1000];
5724 tty->print("Compiler intrinsic is defined for method [%s], "
5725 "but the method is not available in class [%s].%s",
5726 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5727 buf, sizeof(buf)),
5728 ik->name()->as_C_string(),
5729 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5730 );
5731 tty->cr();
5732 DEBUG_ONLY(vm_exit(1));
5733 }
5734 }
5735 } // end for
5736 } // CheckIntrinsics
5737 #endif // ASSERT
5738 }
5739 }
5740
5741 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5742 if (_klass != NULL) {
5743 return _klass;
5744 }
5745
5746 InstanceKlass* const ik =
5747 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5748
5749 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5750
5751 assert(_klass == ik, "invariant");
5752
5753
5754 if (ik->should_store_fingerprint()) {
5755 ik->store_fingerprint(_stream->compute_fingerprint());
5756 }
5757
5758 ik->set_has_passed_fingerprint_check(false);
5759 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5760 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5761 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5762 if (aot_fp != 0 && aot_fp == fp) {
5763 // This class matches with a class saved in an AOT library
5764 ik->set_has_passed_fingerprint_check(true);
5765 } else {
5766 ResourceMark rm;
5767 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5768 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5769 }
5770 }
5771
5772 if (ik->is_value()) {
5773 ValueKlass* vk = ValueKlass::cast(ik);
5774 oop val = ik->allocate_instance(CHECK_NULL);
5775 vk->set_default_value(val);
5776 }
5777
5778 return ik;
5779 }
5780
5781 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5782 assert(ik != NULL, "invariant");
5783
5784 // Set name and CLD before adding to CLD
5785 ik->set_class_loader_data(_loader_data);
5786 ik->set_name(_class_name);
5787
5788 // Add all classes to our internal class loader list here,
5789 // including classes in the bootstrap (NULL) class loader.
5790 const bool publicize = !is_internal();
5791
5792 _loader_data->add_class(ik, publicize);
5793
5794 set_klass_to_deallocate(ik);
5795
5796 assert(_field_info != NULL, "invariant");
5797 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5798 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5799 "sanity");
5800
5801 assert(ik->is_instance_klass(), "sanity");
5802 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5803
5804 // Fill in information already parsed
5805 ik->set_should_verify_class(_need_verify);
5806
5807 // Not yet: supers are done below to support the new subtype-checking fields
5808 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5809 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5810 if (_is_empty_value) {
5811 ik->set_is_empty_value();
5812 }
5813 assert(_fac != NULL, "invariant");
5814 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5815
5816 // this transfers ownership of a lot of arrays from
5817 // the parser onto the InstanceKlass*
5818 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5819
5820 // note that is not safe to use the fields in the parser from this point on
5821 assert(NULL == _cp, "invariant");
5822 assert(NULL == _fields, "invariant");
5823 assert(NULL == _methods, "invariant");
5824 assert(NULL == _inner_classes, "invariant");
5825 assert(NULL == _nest_members, "invariant");
5826 assert(NULL == _local_interfaces, "invariant");
5827 assert(NULL == _combined_annotations, "invariant");
5828
5829 if (_has_final_method) {
5830 ik->set_has_final_method();
5831 }
5832
5833 ik->copy_method_ordering(_method_ordering, CHECK);
5834 // The InstanceKlass::_methods_jmethod_ids cache
5835 // is managed on the assumption that the initial cache
5836 // size is equal to the number of methods in the class. If
5837 // that changes, then InstanceKlass::idnum_can_increment()
5838 // has to be changed accordingly.
5839 ik->set_initial_method_idnum(ik->methods()->length());
5840
5841 ik->set_this_class_index(_this_class_index);
5842
5843 if (is_unsafe_anonymous()) {
5844 // _this_class_index is a CONSTANT_Class entry that refers to this
5845 // anonymous class itself. If this class needs to refer to its own methods or
5846 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5847 // _this_class_index. However, because this class is anonymous (it's
5848 // not stored in SystemDictionary), _this_class_index cannot be resolved
5849 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5850 // Therefore, we must eagerly resolve _this_class_index now.
5851 ik->constants()->klass_at_put(_this_class_index, ik);
5852 }
5853
5854 ik->set_minor_version(_minor_version);
5855 ik->set_major_version(_major_version);
5856 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5857 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5858
5859 if (_unsafe_anonymous_host != NULL) {
5860 assert (ik->is_unsafe_anonymous(), "should be the same");
5861 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5862 }
5863
5864 // Set PackageEntry for this_klass
5865 oop cl = ik->class_loader();
5866 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5867 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5868 ik->set_package(cld, CHECK);
5869
5870 const Array<Method*>* const methods = ik->methods();
5871 assert(methods != NULL, "invariant");
5872 const int methods_len = methods->length();
5873
5874 check_methods_for_intrinsics(ik, methods);
5875
5876 // Fill in field values obtained by parse_classfile_attributes
5877 if (_parsed_annotations->has_any_annotations()) {
5878 _parsed_annotations->apply_to(ik);
5879 }
5880
5881 apply_parsed_class_attributes(ik);
5882
5883 // Miranda methods
5884 if ((_num_miranda_methods > 0) ||
5885 // if this class introduced new miranda methods or
5886 (_super_klass != NULL && _super_klass->has_miranda_methods())
5887 // super class exists and this class inherited miranda methods
5888 ) {
5889 ik->set_has_miranda_methods(); // then set a flag
5890 }
5891
5892 // Fill in information needed to compute superclasses.
5893 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5894 ik->set_transitive_interfaces(_transitive_interfaces);
5895 _transitive_interfaces = NULL;
5896
5897 // Initialize itable offset tables
5898 klassItable::setup_itable_offset_table(ik);
5899
5900 // Compute transitive closure of interfaces this class implements
5901 // Do final class setup
5902 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5903 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5904 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5905 }
5906
5907 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5908 set_precomputed_flags(ik, CHECK);
5909
5910 // check if this class can access its super class
5911 check_super_class_access(ik, CHECK);
5912
5913 // check if this class can access its superinterfaces
5914 check_super_interface_access(ik, CHECK);
5915
5916 // check if this class overrides any final method
5917 check_final_method_override(ik, CHECK);
5918
5919 // reject static interface methods prior to Java 8
5920 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5921 check_illegal_static_method(ik, CHECK);
5922 }
5923
5924 // Obtain this_klass' module entry
5925 ModuleEntry* module_entry = ik->module();
5926 assert(module_entry != NULL, "module_entry should always be set");
5927
5928 // Obtain java.lang.Module
5929 Handle module_handle(THREAD, module_entry->module());
5930
5931 // Allocate mirror and initialize static fields
5932 // The create_mirror() call will also call compute_modifiers()
5933 java_lang_Class::create_mirror(ik,
5934 Handle(THREAD, _loader_data->class_loader()),
5935 module_handle,
5936 _protection_domain,
5937 CHECK);
5938
5939 assert(_all_mirandas != NULL, "invariant");
5940
5941 // Generate any default methods - default methods are public interface methods
5942 // that have a default implementation. This is new with Java 8.
5943 if (_has_nonstatic_concrete_methods) {
5944 DefaultMethods::generate_default_methods(ik,
5945 _all_mirandas,
5946 CHECK);
5947 }
5948
5949 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5950 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5951 !module_entry->has_default_read_edges()) {
5952 if (!module_entry->set_has_default_read_edges()) {
5953 // We won a potential race
5954 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5955 }
5956 }
5957
5958 int nfields = ik->java_fields_count();
5959 if (ik->is_value()) nfields++;
5960 for (int i = 0; i < nfields; i++) {
5961 if (ik->field_is_flattenable(i)) {
5962 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
5963 // Inline classes for instance fields must have been pre-loaded
5964 // Inline classes for static fields might not have been loaded yet
5965 Klass* klass = SystemDictionary::find(klass_name,
5966 Handle(THREAD, ik->class_loader()),
5967 Handle(THREAD, ik->protection_domain()), CHECK);
5968 if (klass != NULL) {
5969 assert(klass->access_flags().is_value_type(), "Value type expected");
5970 ik->set_value_field_klass(i, klass);
5971 }
5972 klass_name->decrement_refcount();
5973 } else
5974 if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5975 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5976 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5977 }
5978 }
5979
5980 if (is_value_type()) {
5981 ValueKlass* vk = ValueKlass::cast(ik);
5982 if (UseNewLayout) {
5983 vk->set_alignment(_alignment);
5984 vk->set_first_field_offset(_first_field_offset);
5985 vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5986 } else {
5987 vk->set_first_field_offset(vk->first_field_offset_old());
5988 }
5989 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
5990 }
5991
5992 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5993
5994 if (!is_internal()) {
5995 if (log_is_enabled(Info, class, load)) {
5996 ResourceMark rm;
5997 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5998 ik->print_class_load_logging(_loader_data, module_name, _stream);
5999 }
6000
6001 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6002 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
6003 log_is_enabled(Info, class, preview)) {
6004 ResourceMark rm;
6005 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
6006 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
6007 }
6008
6009 if (log_is_enabled(Debug, class, resolve)) {
6010 ResourceMark rm;
6011 // print out the superclass.
6012 const char * from = ik->external_name();
6013 if (ik->java_super() != NULL) {
6014 log_debug(class, resolve)("%s %s (super)",
6015 from,
6016 ik->java_super()->external_name());
6017 }
6018 // print out each of the interface classes referred to by this class.
6019 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6020 if (local_interfaces != NULL) {
6021 const int length = local_interfaces->length();
6022 for (int i = 0; i < length; i++) {
6023 const InstanceKlass* const k = local_interfaces->at(i);
6024 const char * to = k->external_name();
6025 log_debug(class, resolve)("%s %s (interface)", from, to);
6026 }
6027 }
6028 }
6029 }
6030
6031 JFR_ONLY(INIT_ID(ik);)
6032
6033 // If we reach here, all is well.
6034 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6035 // in order for it to not be destroyed in the ClassFileParser destructor.
6036 set_klass_to_deallocate(NULL);
6037
6038 // it's official
6039 set_klass(ik);
6040
6041 debug_only(ik->verify();)
6042 }
6043
6044 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6045 // Decrement the refcount in the old name, since we're clobbering it.
6046 _class_name->decrement_refcount();
6047
6048 _class_name = new_class_name;
6049 // Increment the refcount of the new name.
6050 // Now the ClassFileParser owns this name and will decrement in
6051 // the destructor.
6052 _class_name->increment_refcount();
6053 }
6054
6055
6056 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6057 // package by prepending its host class's package name to its class name and setting
6058 // its _class_name field.
6059 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6060 ResourceMark rm(THREAD);
6061 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6062 "Unsafe anonymous class should not be in a package");
6063 const char* host_pkg_name =
6064 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6065
6066 if (host_pkg_name != NULL) {
6067 int host_pkg_len = (int)strlen(host_pkg_name);
6068 int class_name_len = _class_name->utf8_length();
6069 int symbol_len = host_pkg_len + 1 + class_name_len;
6070 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6071 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
6072 host_pkg_name, class_name_len, _class_name->base());
6073 assert(n == symbol_len, "Unexpected number of characters in string");
6074
6075 // Decrement old _class_name to avoid leaking.
6076 _class_name->decrement_refcount();
6077
6078 // Create a symbol and update the anonymous class name.
6079 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6080 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6081 // when the class is unloaded.
6082 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
6083 }
6084 }
6085
6086 // If the host class and the anonymous class are in the same package then do
6087 // nothing. If the anonymous class is in the unnamed package then move it to its
6088 // host's package. If the classes are in different packages then throw an IAE
6089 // exception.
6090 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6091 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6092
6093 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6094 _class_name->utf8_length(), '/');
6095 if (anon_last_slash == NULL) { // Unnamed package
6096 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6097 } else {
6098 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6099 ResourceMark rm(THREAD);
6100 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6101 err_msg("Host class %s and anonymous class %s are in different packages",
6102 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6103 }
6104 }
6105 }
6106
6107 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6108 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6109 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6110 bool need_verify =
6111 // verifyAll
6112 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6113 // verifyRemote
6114 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6115 return !need_verify;
6116 }
6117
6118 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6119 Symbol* name,
6120 ClassLoaderData* loader_data,
6121 Handle protection_domain,
6122 const InstanceKlass* unsafe_anonymous_host,
6123 GrowableArray<Handle>* cp_patches,
6124 Publicity pub_level,
6125 TRAPS) :
6126 _stream(stream),
6127 _requested_name(name),
6128 _class_name(NULL),
6129 _loader_data(loader_data),
6130 _unsafe_anonymous_host(unsafe_anonymous_host),
6131 _cp_patches(cp_patches),
6132 _num_patched_klasses(0),
6133 _max_num_patched_klasses(0),
6134 _orig_cp_size(0),
6135 _first_patched_klass_resolved_index(0),
6136 _super_klass(),
6137 _cp(NULL),
6138 _fields(NULL),
6139 _methods(NULL),
6140 _inner_classes(NULL),
6141 _nest_members(NULL),
6142 _nest_host(0),
6143 _local_interfaces(NULL),
6144 _transitive_interfaces(NULL),
6145 _combined_annotations(NULL),
6146 _annotations(NULL),
6147 _type_annotations(NULL),
6148 _fields_annotations(NULL),
6149 _fields_type_annotations(NULL),
6150 _klass(NULL),
6151 _klass_to_deallocate(NULL),
6152 _parsed_annotations(NULL),
6153 _fac(NULL),
6154 _field_info(NULL),
6155 _method_ordering(NULL),
6156 _all_mirandas(NULL),
6157 _vtable_size(0),
6158 _itable_size(0),
6159 _num_miranda_methods(0),
6160 _rt(REF_NONE),
6161 _protection_domain(protection_domain),
6162 _access_flags(),
6163 _pub_level(pub_level),
6164 _bad_constant_seen(0),
6165 _synthetic_flag(false),
6166 _sde_length(false),
6167 _sde_buffer(NULL),
6168 _sourcefile_index(0),
6169 _generic_signature_index(0),
6170 _major_version(0),
6171 _minor_version(0),
6172 _this_class_index(0),
6173 _super_class_index(0),
6174 _itfs_len(0),
6175 _java_fields_count(0),
6176 _need_verify(false),
6177 _relax_verify(false),
6178 _has_nonstatic_concrete_methods(false),
6179 _declares_nonstatic_concrete_methods(false),
6180 _has_final_method(false),
6181 _has_flattenable_fields(false),
6182 _is_empty_value(false),
6183 _has_finalizer(false),
6184 _has_empty_finalizer(false),
6185 _has_vanilla_constructor(false),
6186 _max_bootstrap_specifier_index(-1) {
6187
6188 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6189 _class_name->increment_refcount();
6190
6191 assert(THREAD->is_Java_thread(), "invariant");
6192 assert(_loader_data != NULL, "invariant");
6193 assert(stream != NULL, "invariant");
6194 assert(_stream != NULL, "invariant");
6195 assert(_stream->buffer() == _stream->current(), "invariant");
6196 assert(_class_name != NULL, "invariant");
6197 assert(0 == _access_flags.as_int(), "invariant");
6198
6199 // Figure out whether we can skip format checking (matching classic VM behavior)
6200 if (DumpSharedSpaces) {
6201 // verify == true means it's a 'remote' class (i.e., non-boot class)
6202 // Verification decision is based on BytecodeVerificationRemote flag
6203 // for those classes.
6204 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6205 BytecodeVerificationLocal;
6206 }
6207 else {
6208 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6209 stream->need_verify());
6210 }
6211 if (_cp_patches != NULL) {
6212 int len = _cp_patches->length();
6213 for (int i=0; i<len; i++) {
6214 if (has_cp_patch_at(i)) {
6215 Handle patch = cp_patch_at(i);
6216 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6217 // We need to append the names of the patched classes to the end of the constant pool,
6218 // because a patched class may have a Utf8 name that's not already included in the
6219 // original constant pool. These class names are used when patch_constant_pool()
6220 // calls patch_class().
6221 //
6222 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6223 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6224 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6225 _max_num_patched_klasses++;
6226 }
6227 }
6228 }
6229 }
6230
6231 // synch back verification state to stream
6232 stream->set_verify(_need_verify);
6233
6234 // Check if verification needs to be relaxed for this class file
6235 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6236 _relax_verify = relax_format_check_for(_loader_data);
6237
6238 parse_stream(stream, CHECK);
6239
6240 post_process_parsed_stream(stream, _cp, CHECK);
6241 }
6242
6243 void ClassFileParser::clear_class_metadata() {
6244 // metadata created before the instance klass is created. Must be
6245 // deallocated if classfile parsing returns an error.
6246 _cp = NULL;
6247 _fields = NULL;
6248 _methods = NULL;
6249 _inner_classes = NULL;
6250 _nest_members = NULL;
6251 _local_interfaces = NULL;
6252 _combined_annotations = NULL;
6253 _annotations = _type_annotations = NULL;
6254 _fields_annotations = _fields_type_annotations = NULL;
6255 }
6256
6257 // Destructor to clean up
6258 ClassFileParser::~ClassFileParser() {
6259 _class_name->decrement_refcount();
6260
6261 if (_cp != NULL) {
6262 MetadataFactory::free_metadata(_loader_data, _cp);
6263 }
6264 if (_fields != NULL) {
6265 MetadataFactory::free_array<u2>(_loader_data, _fields);
6266 }
6267
6268 if (_methods != NULL) {
6269 // Free methods
6270 InstanceKlass::deallocate_methods(_loader_data, _methods);
6271 }
6272
6273 // beware of the Universe::empty_blah_array!!
6274 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6275 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6276 }
6277
6278 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6279 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6280 }
6281
6282 // Free interfaces
6283 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6284 _local_interfaces, _transitive_interfaces);
6285
6286 if (_combined_annotations != NULL) {
6287 // After all annotations arrays have been created, they are installed into the
6288 // Annotations object that will be assigned to the InstanceKlass being created.
6289
6290 // Deallocate the Annotations object and the installed annotations arrays.
6291 _combined_annotations->deallocate_contents(_loader_data);
6292
6293 // If the _combined_annotations pointer is non-NULL,
6294 // then the other annotations fields should have been cleared.
6295 assert(_annotations == NULL, "Should have been cleared");
6296 assert(_type_annotations == NULL, "Should have been cleared");
6297 assert(_fields_annotations == NULL, "Should have been cleared");
6298 assert(_fields_type_annotations == NULL, "Should have been cleared");
6299 } else {
6300 // If the annotations arrays were not installed into the Annotations object,
6301 // then they have to be deallocated explicitly.
6302 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6303 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6304 Annotations::free_contents(_loader_data, _fields_annotations);
6305 Annotations::free_contents(_loader_data, _fields_type_annotations);
6306 }
6307
6308 clear_class_metadata();
6309 _transitive_interfaces = NULL;
6310
6311 // deallocate the klass if already created. Don't directly deallocate, but add
6312 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6313 // at a safepoint.
6314 if (_klass_to_deallocate != NULL) {
6315 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6316 }
6317 }
6318
6319 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6320 TRAPS) {
6321
6322 assert(stream != NULL, "invariant");
6323 assert(_class_name != NULL, "invariant");
6324
6325 // BEGIN STREAM PARSING
6326 stream->guarantee_more(8, CHECK); // magic, major, minor
6327 // Magic value
6328 const u4 magic = stream->get_u4_fast();
6329 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6330 "Incompatible magic value %u in class file %s",
6331 magic, CHECK);
6332
6333 // Version numbers
6334 _minor_version = stream->get_u2_fast();
6335 _major_version = stream->get_u2_fast();
6336
6337 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6338 ResourceMark rm;
6339 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6340 _major_version, _minor_version, _class_name->as_C_string());
6341 Exceptions::fthrow(
6342 THREAD_AND_LOCATION,
6343 vmSymbols::java_lang_UnsupportedClassVersionError(),
6344 "Unsupported major.minor version for dump time %u.%u",
6345 _major_version,
6346 _minor_version);
6347 }
6348
6349 // Check version numbers - we check this even with verifier off
6350 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6351
6352 stream->guarantee_more(3, CHECK); // length, first cp tag
6353 u2 cp_size = stream->get_u2_fast();
6354
6355 guarantee_property(
6356 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6357 cp_size, CHECK);
6358
6359 _orig_cp_size = cp_size;
6360 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6361 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6362 }
6363 cp_size += _max_num_patched_klasses;
6364
6365 _cp = ConstantPool::allocate(_loader_data,
6366 cp_size,
6367 CHECK);
6368
6369 ConstantPool* const cp = _cp;
6370
6371 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6372
6373 assert(cp_size == (const u2)cp->length(), "invariant");
6374
6375 // ACCESS FLAGS
6376 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6377
6378 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6379 // JVM_ACC_MODULE is defined in JDK-9 and later.
6380 if (_major_version >= JAVA_9_VERSION) {
6381 recognized_modifiers |= JVM_ACC_MODULE;
6382 }
6383 // JVM_ACC_VALUE is defined for class file version 55 and later
6384 if (supports_value_types()) {
6385 recognized_modifiers |= JVM_ACC_VALUE;
6386 }
6387
6388 // Access flags
6389 jint flags = stream->get_u2_fast() & recognized_modifiers;
6390
6391 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6392 // Set abstract bit for old class files for backward compatibility
6393 flags |= JVM_ACC_ABSTRACT;
6394 }
6395
6396 verify_legal_class_modifiers(flags, CHECK);
6397
6398 short bad_constant = class_bad_constant_seen();
6399 if (bad_constant != 0) {
6400 // Do not throw CFE until after the access_flags are checked because if
6401 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6402 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6403 }
6404
6405 _access_flags.set_flags(flags);
6406
6407 // This class and superclass
6408 _this_class_index = stream->get_u2_fast();
6409 check_property(
6410 valid_cp_range(_this_class_index, cp_size) &&
6411 cp->tag_at(_this_class_index).is_unresolved_klass(),
6412 "Invalid this class index %u in constant pool in class file %s",
6413 _this_class_index, CHECK);
6414
6415 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6416 assert(class_name_in_cp != NULL, "class_name can't be null");
6417
6418 // Update _class_name to reflect the name in the constant pool
6419 update_class_name(class_name_in_cp);
6420
6421 // Don't need to check whether this class name is legal or not.
6422 // It has been checked when constant pool is parsed.
6423 // However, make sure it is not an array type.
6424 if (_need_verify) {
6425 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6426 "Bad class name in class file %s",
6427 CHECK);
6428 }
6429
6430 // Checks if name in class file matches requested name
6431 if (_requested_name != NULL && _requested_name != _class_name) {
6432 ResourceMark rm(THREAD);
6433 Exceptions::fthrow(
6434 THREAD_AND_LOCATION,
6435 vmSymbols::java_lang_NoClassDefFoundError(),
6436 "%s (wrong name: %s)",
6437 _class_name->as_C_string(),
6438 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6439 );
6440 return;
6441 }
6442
6443 // if this is an anonymous class fix up its name if it's in the unnamed
6444 // package. Otherwise, throw IAE if it is in a different package than
6445 // its host class.
6446 if (_unsafe_anonymous_host != NULL) {
6447 fix_unsafe_anonymous_class_name(CHECK);
6448 }
6449
6450 // Verification prevents us from creating names with dots in them, this
6451 // asserts that that's the case.
6452 assert(is_internal_format(_class_name), "external class name format used internally");
6453
6454 if (!is_internal()) {
6455 LogTarget(Debug, class, preorder) lt;
6456 if (lt.is_enabled()){
6457 ResourceMark rm(THREAD);
6458 LogStream ls(lt);
6459 ls.print("%s", _class_name->as_klass_external_name());
6460 if (stream->source() != NULL) {
6461 ls.print(" source: %s", stream->source());
6462 }
6463 ls.cr();
6464 }
6465
6466 #if INCLUDE_CDS
6467 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6468 if (!ClassLoader::has_jrt_entry()) {
6469 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6470 DumpLoadedClassList = NULL;
6471 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6472 _unsafe_anonymous_host == NULL) {
6473 // Only dump the classes that can be stored into CDS archive.
6474 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6475 oop class_loader = _loader_data->class_loader();
6476 ResourceMark rm(THREAD);
6477 bool skip = false;
6478 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6479 // For the boot and platform class loaders, skip classes that are not found in the
6480 // java runtime image, such as those found in the --patch-module entries.
6481 // These classes can't be loaded from the archive during runtime.
6482 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6483 skip = true;
6484 }
6485
6486 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6487 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6488 // as they can be loaded from the archive during runtime.
6489 skip = false;
6490 }
6491 }
6492 if (skip) {
6493 tty->print_cr("skip writing class %s from source %s to classlist file",
6494 _class_name->as_C_string(), stream->source());
6495 } else {
6496 classlist_file->print_cr("%s", _class_name->as_C_string());
6497 classlist_file->flush();
6498 }
6499 }
6500 }
6501 #endif
6502 }
6503
6504 // SUPERKLASS
6505 _super_class_index = stream->get_u2_fast();
6506 _super_klass = parse_super_class(cp,
6507 _super_class_index,
6508 _need_verify,
6509 CHECK);
6510
6511 // Interfaces
6512 _itfs_len = stream->get_u2_fast();
6513 parse_interfaces(stream,
6514 _itfs_len,
6515 cp,
6516 &_has_nonstatic_concrete_methods,
6517 CHECK);
6518
6519 assert(_local_interfaces != NULL, "invariant");
6520
6521 // Fields (offsets are filled in later)
6522 _fac = new FieldAllocationCount();
6523 parse_fields(stream,
6524 _access_flags.is_interface(),
6525 _access_flags.is_value_type(),
6526 _fac,
6527 cp,
6528 cp_size,
6529 &_java_fields_count,
6530 CHECK);
6531
6532 assert(_fields != NULL, "invariant");
6533
6534 // Methods
6535 AccessFlags promoted_flags;
6536 parse_methods(stream,
6537 _access_flags.is_interface(),
6538 _access_flags.is_value_type(),
6539 &promoted_flags,
6540 &_has_final_method,
6541 &_declares_nonstatic_concrete_methods,
6542 CHECK);
6543
6544 assert(_methods != NULL, "invariant");
6545
6546 // promote flags from parse_methods() to the klass' flags
6547 _access_flags.add_promoted_flags(promoted_flags.as_int());
6548
6549 if (_declares_nonstatic_concrete_methods) {
6550 _has_nonstatic_concrete_methods = true;
6551 }
6552
6553 // Additional attributes/annotations
6554 _parsed_annotations = new ClassAnnotationCollector();
6555 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6556
6557 assert(_inner_classes != NULL, "invariant");
6558
6559 // Finalize the Annotations metadata object,
6560 // now that all annotation arrays have been created.
6561 create_combined_annotations(CHECK);
6562
6563 // Make sure this is the end of class file stream
6564 guarantee_property(stream->at_eos(),
6565 "Extra bytes at the end of class file %s",
6566 CHECK);
6567
6568 // all bytes in stream read and parsed
6569 }
6570
6571 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6572 ConstantPool* cp,
6573 TRAPS) {
6574 assert(stream != NULL, "invariant");
6575 assert(stream->at_eos(), "invariant");
6576 assert(cp != NULL, "invariant");
6577 assert(_loader_data != NULL, "invariant");
6578
6579 if (_class_name == vmSymbols::java_lang_Object()) {
6580 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6581 "java.lang.Object cannot implement an interface in class file %s",
6582 CHECK);
6583 }
6584 // We check super class after class file is parsed and format is checked
6585 if (_super_class_index > 0 && NULL ==_super_klass) {
6586 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6587 if (_access_flags.is_interface()) {
6588 // Before attempting to resolve the superclass, check for class format
6589 // errors not checked yet.
6590 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6591 "Interfaces must have java.lang.Object as superclass in class file %s",
6592 CHECK);
6593 }
6594 Handle loader(THREAD, _loader_data->class_loader());
6595 _super_klass = (const InstanceKlass*)
6596 SystemDictionary::resolve_super_or_fail(_class_name,
6597 super_class_name,
6598 loader,
6599 _protection_domain,
6600 true,
6601 CHECK);
6602 }
6603
6604 if (_super_klass != NULL) {
6605 if (_super_klass->has_nonstatic_concrete_methods()) {
6606 _has_nonstatic_concrete_methods = true;
6607 }
6608
6609 if (_super_klass->is_interface()) {
6610 ResourceMark rm(THREAD);
6611 Exceptions::fthrow(
6612 THREAD_AND_LOCATION,
6613 vmSymbols::java_lang_IncompatibleClassChangeError(),
6614 "class %s has interface %s as super class",
6615 _class_name->as_klass_external_name(),
6616 _super_klass->external_name()
6617 );
6618 return;
6619 }
6620
6621 // For a value class, only java/lang/Object is an acceptable super class
6622 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6623 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6624 "Value type must have java.lang.Object as superclass in class file %s",
6625 CHECK);
6626 }
6627
6628 // Make sure super class is not final
6629 if (_super_klass->is_final()) {
6630 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6631 }
6632 }
6633
6634 // Compute the transitive list of all unique interfaces implemented by this class
6635 _transitive_interfaces =
6636 compute_transitive_interfaces(_super_klass,
6637 _local_interfaces,
6638 _loader_data,
6639 CHECK);
6640
6641 assert(_transitive_interfaces != NULL, "invariant");
6642
6643 // sort methods
6644 _method_ordering = sort_methods(_methods);
6645
6646 _all_mirandas = new GrowableArray<Method*>(20);
6647
6648 Handle loader(THREAD, _loader_data->class_loader());
6649 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6650 &_num_miranda_methods,
6651 _all_mirandas,
6652 _super_klass,
6653 _methods,
6654 _access_flags,
6655 _major_version,
6656 loader,
6657 _class_name,
6658 _local_interfaces,
6659 CHECK);
6660
6661 // Size of Java itable (in words)
6662 _itable_size = _access_flags.is_interface() ? 0 :
6663 klassItable::compute_itable_size(_transitive_interfaces);
6664
6665 assert(_fac != NULL, "invariant");
6666 assert(_parsed_annotations != NULL, "invariant");
6667
6668
6669 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6670 if (fs.is_flattenable() && !fs.access_flags().is_static()) {
6671 // Pre-load value class
6672 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6673 Handle(THREAD, _loader_data->class_loader()),
6674 _protection_domain, true, CHECK);
6675 assert(klass != NULL, "Sanity check");
6676 assert(klass->access_flags().is_value_type(), "Value type expected");
6677 _has_flattenable_fields = true;
6678 }
6679 }
6680
6681 _field_info = new FieldLayoutInfo();
6682 if (UseNewLayout) {
6683 FieldLayoutBuilder lb(this, _field_info);
6684 if (this->is_value_type()) {
6685 lb.compute_inline_class_layout(CHECK);
6686 _alignment = lb.get_alignment();
6687 _first_field_offset = lb.get_first_field_offset();
6688 _exact_size_in_bytes = lb.get_exact_size_in_byte();
6689 } else {
6690 lb.compute_regular_layout(CHECK);
6691 }
6692 } else {
6693 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6694 }
6695
6696 // Compute reference type
6697 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6698
6699 }
6700
6701 void ClassFileParser::set_klass(InstanceKlass* klass) {
6702
6703 #ifdef ASSERT
6704 if (klass != NULL) {
6705 assert(NULL == _klass, "leaking?");
6706 }
6707 #endif
6708
6709 _klass = klass;
6710 }
6711
6712 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6713
6714 #ifdef ASSERT
6715 if (klass != NULL) {
6716 assert(NULL == _klass_to_deallocate, "leaking?");
6717 }
6718 #endif
6719
6720 _klass_to_deallocate = klass;
6721 }
6722
6723 // Caller responsible for ResourceMark
6724 // clone stream with rewound position
6725 const ClassFileStream* ClassFileParser::clone_stream() const {
6726 assert(_stream != NULL, "invariant");
6727
6728 return _stream->clone();
6729 }
6730
6731 // ----------------------------------------------------------------------------
6732 // debugging
6733
6734 #ifdef ASSERT
6735
6736 // return true if class_name contains no '.' (internal format is '/')
6737 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6738 if (class_name != NULL) {
6739 ResourceMark rm;
6740 char* name = class_name->as_C_string();
6741 return strchr(name, '.') == NULL;
6742 } else {
6743 return true;
6744 }
6745 }
6746
6747 #endif