1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/annotations.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "oops/valueKlass.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/perfData.hpp"
65 #include "runtime/reflection.hpp"
66 #include "runtime/safepointVerifiers.hpp"
67 #include "runtime/signature.hpp"
68 #include "runtime/timer.hpp"
69 #include "services/classLoadingService.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/bitMap.inline.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/exceptions.hpp"
75 #include "utilities/globalDefinitions.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/ostream.hpp"
79 #include "utilities/resourceHash.hpp"
80 #if INCLUDE_CDS
81 #include "classfile/systemDictionaryShared.hpp"
82 #endif
83 #if INCLUDE_JFR
84 #include "jfr/support/jfrTraceIdExtension.hpp"
85 #endif
86
87 // We generally try to create the oops directly when parsing, rather than
88 // allocating temporary data structures and copying the bytes twice. A
89 // temporary area is only needed when parsing utf8 entries in the constant
90 // pool and when parsing line number tables.
91
92 // We add assert in debug mode when class format is not checked.
93
94 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
95 #define JAVA_MIN_SUPPORTED_VERSION 45
96 #define JAVA_PREVIEW_MINOR_VERSION 65535
97
98 // Used for two backward compatibility reasons:
99 // - to check for new additions to the class file format in JDK1.5
100 // - to check for bug fixes in the format checker in JDK1.5
101 #define JAVA_1_5_VERSION 49
102
103 // Used for backward compatibility reasons:
104 // - to check for javac bug fixes that happened after 1.5
105 // - also used as the max version when running in jdk6
106 #define JAVA_6_VERSION 50
107
108 // Used for backward compatibility reasons:
109 // - to disallow argument and require ACC_STATIC for <clinit> methods
110 #define JAVA_7_VERSION 51
111
112 // Extension method support.
113 #define JAVA_8_VERSION 52
114
115 #define JAVA_9_VERSION 53
116
117 #define JAVA_10_VERSION 54
118
119 #define JAVA_11_VERSION 55
120
121 #define JAVA_12_VERSION 56
122
123 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
124 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
125 "Unexpected bad constant pool entry");
126 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
127 }
128
129 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
130 ConstantPool* cp,
131 const int length,
132 TRAPS) {
133 assert(stream != NULL, "invariant");
134 assert(cp != NULL, "invariant");
135
136 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
137 // this function (_current can be allocated in a register, with scalar
138 // replacement of aggregates). The _current pointer is copied back to
139 // stream() when this function returns. DON'T call another method within
140 // this method that uses stream().
141 const ClassFileStream cfs1 = *stream;
142 const ClassFileStream* const cfs = &cfs1;
143
144 assert(cfs->allocated_on_stack(), "should be local");
145 debug_only(const u1* const old_current = stream->current();)
146
147 // Used for batching symbol allocations.
148 const char* names[SymbolTable::symbol_alloc_batch_size];
149 int lengths[SymbolTable::symbol_alloc_batch_size];
150 int indices[SymbolTable::symbol_alloc_batch_size];
151 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
152 int names_count = 0;
153
154 // parsing Index 0 is unused
155 for (int index = 1; index < length; index++) {
156 // Each of the following case guarantees one more byte in the stream
157 // for the following tag or the access_flags following constant pool,
158 // so we don't need bounds-check for reading tag.
159 const u1 tag = cfs->get_u1_fast();
160 switch (tag) {
161 case JVM_CONSTANT_Class: {
162 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
163 const u2 name_index = cfs->get_u2_fast();
164 cp->klass_index_at_put(index, name_index);
165 break;
166 }
167 case JVM_CONSTANT_Fieldref: {
168 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
169 const u2 class_index = cfs->get_u2_fast();
170 const u2 name_and_type_index = cfs->get_u2_fast();
171 cp->field_at_put(index, class_index, name_and_type_index);
172 break;
173 }
174 case JVM_CONSTANT_Methodref: {
175 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
176 const u2 class_index = cfs->get_u2_fast();
177 const u2 name_and_type_index = cfs->get_u2_fast();
178 cp->method_at_put(index, class_index, name_and_type_index);
179 break;
180 }
181 case JVM_CONSTANT_InterfaceMethodref: {
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->interface_method_at_put(index, class_index, name_and_type_index);
186 break;
187 }
188 case JVM_CONSTANT_String : {
189 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
190 const u2 string_index = cfs->get_u2_fast();
191 cp->string_index_at_put(index, string_index);
192 break;
193 }
194 case JVM_CONSTANT_MethodHandle :
195 case JVM_CONSTANT_MethodType: {
196 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
197 classfile_parse_error(
198 "Class file version does not support constant tag %u in class file %s",
199 tag, CHECK);
200 }
201 if (tag == JVM_CONSTANT_MethodHandle) {
202 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
203 const u1 ref_kind = cfs->get_u1_fast();
204 const u2 method_index = cfs->get_u2_fast();
205 cp->method_handle_index_at_put(index, ref_kind, method_index);
206 }
207 else if (tag == JVM_CONSTANT_MethodType) {
208 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
209 const u2 signature_index = cfs->get_u2_fast();
210 cp->method_type_index_at_put(index, signature_index);
211 }
212 else {
213 ShouldNotReachHere();
214 }
215 break;
216 }
217 case JVM_CONSTANT_Dynamic : {
218 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
219 classfile_parse_error(
220 "Class file version does not support constant tag %u in class file %s",
221 tag, CHECK);
222 }
223 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
224 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
225 const u2 name_and_type_index = cfs->get_u2_fast();
226 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
227 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
228 }
229 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
230 break;
231 }
232 case JVM_CONSTANT_InvokeDynamic : {
233 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
234 classfile_parse_error(
235 "Class file version does not support constant tag %u in class file %s",
236 tag, CHECK);
237 }
238 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
239 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
240 const u2 name_and_type_index = cfs->get_u2_fast();
241 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
242 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
243 }
244 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
245 break;
246 }
247 case JVM_CONSTANT_Integer: {
248 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
249 const u4 bytes = cfs->get_u4_fast();
250 cp->int_at_put(index, (jint)bytes);
251 break;
252 }
253 case JVM_CONSTANT_Float: {
254 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
255 const u4 bytes = cfs->get_u4_fast();
256 cp->float_at_put(index, *(jfloat*)&bytes);
257 break;
258 }
259 case JVM_CONSTANT_Long: {
260 // A mangled type might cause you to overrun allocated memory
261 guarantee_property(index + 1 < length,
262 "Invalid constant pool entry %u in class file %s",
263 index,
264 CHECK);
265 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
266 const u8 bytes = cfs->get_u8_fast();
267 cp->long_at_put(index, bytes);
268 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
269 break;
270 }
271 case JVM_CONSTANT_Double: {
272 // A mangled type might cause you to overrun allocated memory
273 guarantee_property(index+1 < length,
274 "Invalid constant pool entry %u in class file %s",
275 index,
276 CHECK);
277 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
278 const u8 bytes = cfs->get_u8_fast();
279 cp->double_at_put(index, *(jdouble*)&bytes);
280 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
281 break;
282 }
283 case JVM_CONSTANT_NameAndType: {
284 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
285 const u2 name_index = cfs->get_u2_fast();
286 const u2 signature_index = cfs->get_u2_fast();
287 cp->name_and_type_at_put(index, name_index, signature_index);
288 break;
289 }
290 case JVM_CONSTANT_Utf8 : {
291 cfs->guarantee_more(2, CHECK); // utf8_length
292 u2 utf8_length = cfs->get_u2_fast();
293 const u1* utf8_buffer = cfs->current();
294 assert(utf8_buffer != NULL, "null utf8 buffer");
295 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
296 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
297 cfs->skip_u1_fast(utf8_length);
298
299 // Before storing the symbol, make sure it's legal
300 if (_need_verify) {
301 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
302 }
303
304 if (has_cp_patch_at(index)) {
305 Handle patch = clear_cp_patch_at(index);
306 guarantee_property(java_lang_String::is_instance(patch()),
307 "Illegal utf8 patch at %d in class file %s",
308 index,
309 CHECK);
310 const char* const str = java_lang_String::as_utf8_string(patch());
311 // (could use java_lang_String::as_symbol instead, but might as well batch them)
312 utf8_buffer = (const u1*) str;
313 utf8_length = (int) strlen(str);
314 }
315
316 unsigned int hash;
317 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
318 utf8_length,
319 hash);
320 if (result == NULL) {
321 names[names_count] = (const char*)utf8_buffer;
322 lengths[names_count] = utf8_length;
323 indices[names_count] = index;
324 hashValues[names_count++] = hash;
325 if (names_count == SymbolTable::symbol_alloc_batch_size) {
326 SymbolTable::new_symbols(_loader_data,
327 cp,
328 names_count,
329 names,
330 lengths,
331 indices,
332 hashValues,
333 CHECK);
334 names_count = 0;
335 }
336 } else {
337 cp->symbol_at_put(index, result);
338 }
339 break;
340 }
341 case 19:
342 case 20: {
343 // Record that an error occurred in these two cases but keep parsing so
344 // that ACC_Module can be checked for in the access_flags. Need to
345 // throw NoClassDefFoundError in that case.
346 if (_major_version >= JAVA_9_VERSION) {
347 cfs->guarantee_more(3, CHECK);
348 cfs->get_u2_fast();
349 set_class_bad_constant_seen(tag);
350 break;
351 }
352 }
353 default: {
354 classfile_parse_error("Unknown constant tag %u in class file %s",
355 tag,
356 CHECK);
357 break;
358 }
359 } // end of switch(tag)
360 } // end of for
361
362 // Allocate the remaining symbols
363 if (names_count > 0) {
364 SymbolTable::new_symbols(_loader_data,
365 cp,
366 names_count,
367 names,
368 lengths,
369 indices,
370 hashValues,
371 CHECK);
372 }
373
374 // Copy _current pointer of local copy back to stream.
375 assert(stream->current() == old_current, "non-exclusive use of stream");
376 stream->set_current(cfs1.current());
377
378 }
379
380 static inline bool valid_cp_range(int index, int length) {
381 return (index > 0 && index < length);
382 }
383
384 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
385 assert(cp != NULL, "invariant");
386 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
387 return cp->symbol_at(index);
388 }
389 return NULL;
390 }
391
392 #ifdef ASSERT
393 PRAGMA_DIAG_PUSH
394 PRAGMA_FORMAT_NONLITERAL_IGNORED
395 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
396 ResourceMark rm(THREAD);
397 fatal(msg, _class_name->as_C_string());
398 }
399
400 void ClassFileParser::report_assert_property_failure(const char* msg,
401 int index,
402 TRAPS) const {
403 ResourceMark rm(THREAD);
404 fatal(msg, index, _class_name->as_C_string());
405 }
406 PRAGMA_DIAG_POP
407 #endif
408
409 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
410 ConstantPool* const cp,
411 const int length,
412 TRAPS) {
413 assert(cp != NULL, "invariant");
414 assert(stream != NULL, "invariant");
415
416 // parsing constant pool entries
417 parse_constant_pool_entries(stream, cp, length, CHECK);
418 if (class_bad_constant_seen() != 0) {
419 // a bad CP entry has been detected previously so stop parsing and just return.
420 return;
421 }
422
423 int index = 1; // declared outside of loops for portability
424 int num_klasses = 0;
425
426 // first verification pass - validate cross references
427 // and fixup class and string constants
428 for (index = 1; index < length; index++) { // Index 0 is unused
429 const jbyte tag = cp->tag_at(index).value();
430 switch (tag) {
431 case JVM_CONSTANT_Class: {
432 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
433 break;
434 }
435 case JVM_CONSTANT_Fieldref:
436 // fall through
437 case JVM_CONSTANT_Methodref:
438 // fall through
439 case JVM_CONSTANT_InterfaceMethodref: {
440 if (!_need_verify) break;
441 const int klass_ref_index = cp->klass_ref_index_at(index);
442 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
443 check_property(valid_klass_reference_at(klass_ref_index),
444 "Invalid constant pool index %u in class file %s",
445 klass_ref_index, CHECK);
446 check_property(valid_cp_range(name_and_type_ref_index, length) &&
447 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
448 "Invalid constant pool index %u in class file %s",
449 name_and_type_ref_index, CHECK);
450 break;
451 }
452 case JVM_CONSTANT_String: {
453 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
454 break;
455 }
456 case JVM_CONSTANT_Integer:
457 break;
458 case JVM_CONSTANT_Float:
459 break;
460 case JVM_CONSTANT_Long:
461 case JVM_CONSTANT_Double: {
462 index++;
463 check_property(
464 (index < length && cp->tag_at(index).is_invalid()),
465 "Improper constant pool long/double index %u in class file %s",
466 index, CHECK);
467 break;
468 }
469 case JVM_CONSTANT_NameAndType: {
470 if (!_need_verify) break;
471 const int name_ref_index = cp->name_ref_index_at(index);
472 const int signature_ref_index = cp->signature_ref_index_at(index);
473 check_property(valid_symbol_at(name_ref_index),
474 "Invalid constant pool index %u in class file %s",
475 name_ref_index, CHECK);
476 check_property(valid_symbol_at(signature_ref_index),
477 "Invalid constant pool index %u in class file %s",
478 signature_ref_index, CHECK);
479 break;
480 }
481 case JVM_CONSTANT_Utf8:
482 break;
483 case JVM_CONSTANT_UnresolvedClass: // fall-through
484 case JVM_CONSTANT_UnresolvedClassInError: {
485 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
486 break;
487 }
488 case JVM_CONSTANT_ClassIndex: {
489 const int class_index = cp->klass_index_at(index);
490 check_property(valid_symbol_at(class_index),
491 "Invalid constant pool index %u in class file %s",
492 class_index, CHECK);
493
494 Symbol* const name = cp->symbol_at(class_index);
495 const unsigned int name_len = name->utf8_length();
496
497 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
498 break;
499 }
500 case JVM_CONSTANT_StringIndex: {
501 const int string_index = cp->string_index_at(index);
502 check_property(valid_symbol_at(string_index),
503 "Invalid constant pool index %u in class file %s",
504 string_index, CHECK);
505 Symbol* const sym = cp->symbol_at(string_index);
506 cp->unresolved_string_at_put(index, sym);
507 break;
508 }
509 case JVM_CONSTANT_MethodHandle: {
510 const int ref_index = cp->method_handle_index_at(index);
511 check_property(valid_cp_range(ref_index, length),
512 "Invalid constant pool index %u in class file %s",
513 ref_index, CHECK);
514 const constantTag tag = cp->tag_at(ref_index);
515 const int ref_kind = cp->method_handle_ref_kind_at(index);
516
517 switch (ref_kind) {
518 case JVM_REF_getField:
519 case JVM_REF_getStatic:
520 case JVM_REF_putField:
521 case JVM_REF_putStatic: {
522 check_property(
523 tag.is_field(),
524 "Invalid constant pool index %u in class file %s (not a field)",
525 ref_index, CHECK);
526 break;
527 }
528 case JVM_REF_invokeVirtual:
529 case JVM_REF_newInvokeSpecial: {
530 check_property(
531 tag.is_method(),
532 "Invalid constant pool index %u in class file %s (not a method)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeStatic:
537 case JVM_REF_invokeSpecial: {
538 check_property(
539 tag.is_method() ||
540 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
541 "Invalid constant pool index %u in class file %s (not a method)",
542 ref_index, CHECK);
543 break;
544 }
545 case JVM_REF_invokeInterface: {
546 check_property(
547 tag.is_interface_method(),
548 "Invalid constant pool index %u in class file %s (not an interface method)",
549 ref_index, CHECK);
550 break;
551 }
552 default: {
553 classfile_parse_error(
554 "Bad method handle kind at constant pool index %u in class file %s",
555 index, CHECK);
556 }
557 } // switch(refkind)
558 // Keep the ref_index unchanged. It will be indirected at link-time.
559 break;
560 } // case MethodHandle
561 case JVM_CONSTANT_MethodType: {
562 const int ref_index = cp->method_type_index_at(index);
563 check_property(valid_symbol_at(ref_index),
564 "Invalid constant pool index %u in class file %s",
565 ref_index, CHECK);
566 break;
567 }
568 case JVM_CONSTANT_Dynamic: {
569 const int name_and_type_ref_index =
570 cp->invoke_dynamic_name_and_type_ref_index_at(index);
571
572 check_property(valid_cp_range(name_and_type_ref_index, length) &&
573 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
574 "Invalid constant pool index %u in class file %s",
575 name_and_type_ref_index, CHECK);
576 // bootstrap specifier index must be checked later,
577 // when BootstrapMethods attr is available
578
579 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
580 cp->set_has_dynamic_constant();
581 break;
582 }
583 case JVM_CONSTANT_InvokeDynamic: {
584 const int name_and_type_ref_index =
585 cp->invoke_dynamic_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 break;
594 }
595 default: {
596 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
597 ShouldNotReachHere();
598 break;
599 }
600 } // switch(tag)
601 } // end of for
602
603 _first_patched_klass_resolved_index = num_klasses;
604 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
605
606 if (_cp_patches != NULL) {
607 // need to treat this_class specially...
608
609 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
610 // for now. These will be replaced with actual names of the patched classes in patch_class().
611 Symbol* s = vmSymbols::star_name();
612 for (int n=_orig_cp_size; n<cp->length(); n++) {
613 cp->symbol_at_put(n, s);
614 }
615
616 int this_class_index;
617 {
618 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
619 const u1* const mark = stream->current();
620 stream->skip_u2_fast(1); // skip flags
621 this_class_index = stream->get_u2_fast();
622 stream->set_current(mark); // revert to mark
623 }
624
625 for (index = 1; index < length; index++) { // Index 0 is unused
626 if (has_cp_patch_at(index)) {
627 guarantee_property(index != this_class_index,
628 "Illegal constant pool patch to self at %d in class file %s",
629 index, CHECK);
630 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
631 }
632 }
633 }
634
635 if (!_need_verify) {
636 return;
637 }
638
639 // second verification pass - checks the strings are of the right format.
640 // but not yet to the other entries
641 for (index = 1; index < length; index++) {
642 const jbyte tag = cp->tag_at(index).value();
643 switch (tag) {
644 case JVM_CONSTANT_UnresolvedClass: {
645 const Symbol* const class_name = cp->klass_name_at(index);
646 // check the name, even if _cp_patches will overwrite it
647 verify_legal_class_name(class_name, CHECK);
648 break;
649 }
650 case JVM_CONSTANT_NameAndType: {
651 if (_need_verify) {
652 const int sig_index = cp->signature_ref_index_at(index);
653 const int name_index = cp->name_ref_index_at(index);
654 const Symbol* const name = cp->symbol_at(name_index);
655 const Symbol* const sig = cp->symbol_at(sig_index);
656 guarantee_property(sig->utf8_length() != 0,
657 "Illegal zero length constant pool entry at %d in class %s",
658 sig_index, CHECK);
659 guarantee_property(name->utf8_length() != 0,
660 "Illegal zero length constant pool entry at %d in class %s",
661 name_index, CHECK);
662
663 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
664 // Format check method name and signature
665 verify_legal_method_name(name, CHECK);
666 verify_legal_method_signature(name, sig, CHECK);
667 } else {
668 // Format check field name and signature
669 verify_legal_field_name(name, CHECK);
670 verify_legal_field_signature(name, sig, CHECK);
671 }
672 }
673 break;
674 }
675 case JVM_CONSTANT_Dynamic: {
676 const int name_and_type_ref_index =
677 cp->name_and_type_ref_index_at(index);
678 // already verified to be utf8
679 const int name_ref_index =
680 cp->name_ref_index_at(name_and_type_ref_index);
681 // already verified to be utf8
682 const int signature_ref_index =
683 cp->signature_ref_index_at(name_and_type_ref_index);
684 const Symbol* const name = cp->symbol_at(name_ref_index);
685 const Symbol* const signature = cp->symbol_at(signature_ref_index);
686 if (_need_verify) {
687 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
688 // Need only to be sure signature is non-zero length and the right type.
689 if (signature->utf8_length() == 0 ||
690 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
691 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
692 }
693 }
694 break;
695 }
696 case JVM_CONSTANT_InvokeDynamic:
697 case JVM_CONSTANT_Fieldref:
698 case JVM_CONSTANT_Methodref:
699 case JVM_CONSTANT_InterfaceMethodref: {
700 const int name_and_type_ref_index =
701 cp->name_and_type_ref_index_at(index);
702 // already verified to be utf8
703 const int name_ref_index =
704 cp->name_ref_index_at(name_and_type_ref_index);
705 // already verified to be utf8
706 const int signature_ref_index =
707 cp->signature_ref_index_at(name_and_type_ref_index);
708 const Symbol* const name = cp->symbol_at(name_ref_index);
709 const Symbol* const signature = cp->symbol_at(signature_ref_index);
710 if (tag == JVM_CONSTANT_Fieldref) {
711 if (_need_verify) {
712 // Field name and signature are verified above, when iterating NameAndType_info.
713 // Need only to be sure signature is non-zero length and the right type.
714 if (signature->utf8_length() == 0 ||
715 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
716 throwIllegalSignature("Field", name, signature, CHECK);
717 }
718 }
719 } else {
720 if (_need_verify) {
721 // Method name and signature are verified above, when iterating NameAndType_info.
722 // Need only to be sure signature is non-zero length and the right type.
723 if (signature->utf8_length() == 0 ||
724 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
725 throwIllegalSignature("Method", name, signature, CHECK);
726 }
727 }
728 // 4509014: If a class method name begins with '<', it must be "<init>"
729 const unsigned int name_len = name->utf8_length();
730 if (tag == JVM_CONSTANT_Methodref &&
731 name_len != 0 &&
732 name->byte_at(0) == '<' &&
733 name != vmSymbols::object_initializer_name()) {
734 classfile_parse_error(
735 "Bad method name at constant pool index %u in class file %s",
736 name_ref_index, CHECK);
737 }
738 }
739 break;
740 }
741 case JVM_CONSTANT_MethodHandle: {
742 const int ref_index = cp->method_handle_index_at(index);
743 const int ref_kind = cp->method_handle_ref_kind_at(index);
744 switch (ref_kind) {
745 case JVM_REF_invokeVirtual:
746 case JVM_REF_invokeStatic:
747 case JVM_REF_invokeSpecial:
748 case JVM_REF_newInvokeSpecial: {
749 const int name_and_type_ref_index =
750 cp->name_and_type_ref_index_at(ref_index);
751 const int name_ref_index =
752 cp->name_ref_index_at(name_and_type_ref_index);
753 const Symbol* const name = cp->symbol_at(name_ref_index);
754 if (ref_kind == JVM_REF_newInvokeSpecial) {
755 if (name != vmSymbols::object_initializer_name()) {
756 classfile_parse_error(
757 "Bad constructor name at constant pool index %u in class file %s",
758 name_ref_index, CHECK);
759 }
760 } else {
761 if (name == vmSymbols::object_initializer_name()) {
762 classfile_parse_error(
763 "Bad method name at constant pool index %u in class file %s",
764 name_ref_index, CHECK);
765 }
766 }
767 break;
768 }
769 // Other ref_kinds are already fully checked in previous pass.
770 } // switch(ref_kind)
771 break;
772 }
773 case JVM_CONSTANT_MethodType: {
774 const Symbol* const no_name = vmSymbols::type_name(); // place holder
775 const Symbol* const signature = cp->method_type_signature_at(index);
776 verify_legal_method_signature(no_name, signature, CHECK);
777 break;
778 }
779 case JVM_CONSTANT_Utf8: {
780 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
781 }
782 } // switch(tag)
783 } // end of for
784 }
785
786 Handle ClassFileParser::clear_cp_patch_at(int index) {
787 Handle patch = cp_patch_at(index);
788 _cp_patches->at_put(index, Handle());
789 assert(!has_cp_patch_at(index), "");
790 return patch;
791 }
792
793 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
794 int name_index = _orig_cp_size + _num_patched_klasses;
795 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
796
797 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
798 _num_patched_klasses ++;
799 }
800
801 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
802 int index,
803 Handle patch,
804 TRAPS) {
805 assert(cp != NULL, "invariant");
806
807 BasicType patch_type = T_VOID;
808
809 switch (cp->tag_at(index).value()) {
810
811 case JVM_CONSTANT_UnresolvedClass: {
812 // Patching a class means pre-resolving it.
813 // The name in the constant pool is ignored.
814 if (java_lang_Class::is_instance(patch())) {
815 guarantee_property(!java_lang_Class::is_primitive(patch()),
816 "Illegal class patch at %d in class file %s",
817 index, CHECK);
818 Klass* k = java_lang_Class::as_Klass(patch());
819 patch_class(cp, index, k, k->name());
820 } else {
821 guarantee_property(java_lang_String::is_instance(patch()),
822 "Illegal class patch at %d in class file %s",
823 index, CHECK);
824 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
825 patch_class(cp, index, NULL, name);
826 }
827 break;
828 }
829
830 case JVM_CONSTANT_String: {
831 // skip this patch and don't clear it. Needs the oop array for resolved
832 // references to be created first.
833 return;
834 }
835 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
836 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
837 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
838 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
839 patch_prim:
840 {
841 jvalue value;
842 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
843 guarantee_property(value_type == patch_type,
844 "Illegal primitive patch at %d in class file %s",
845 index, CHECK);
846 switch (value_type) {
847 case T_INT: cp->int_at_put(index, value.i); break;
848 case T_FLOAT: cp->float_at_put(index, value.f); break;
849 case T_LONG: cp->long_at_put(index, value.j); break;
850 case T_DOUBLE: cp->double_at_put(index, value.d); break;
851 default: assert(false, "");
852 }
853 } // end patch_prim label
854 break;
855
856 default: {
857 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
858 guarantee_property(!has_cp_patch_at(index),
859 "Illegal unexpected patch at %d in class file %s",
860 index, CHECK);
861 return;
862 }
863 } // end of switch(tag)
864
865 // On fall-through, mark the patch as used.
866 clear_cp_patch_at(index);
867 }
868 class NameSigHash: public ResourceObj {
869 public:
870 const Symbol* _name; // name
871 const Symbol* _sig; // signature
872 NameSigHash* _next; // Next entry in hash table
873 };
874
875 static const int HASH_ROW_SIZE = 256;
876
877 static unsigned int hash(const Symbol* name, const Symbol* sig) {
878 unsigned int raw_hash = 0;
879 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
880 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
881
882 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
883 }
884
885
886 static void initialize_hashtable(NameSigHash** table) {
887 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
888 }
889 // Return false if the name/sig combination is found in table.
890 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
891 // The old format checker uses heap sort to find duplicates.
892 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
893 // of table since we don't expect Symbol*'s to move.
894 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
895 assert(name != NULL, "name in constant pool is NULL");
896
897 // First lookup for duplicates
898 int index = hash(name, sig);
899 NameSigHash* entry = table[index];
900 while (entry != NULL) {
901 if (entry->_name == name && entry->_sig == sig) {
902 return false;
903 }
904 entry = entry->_next;
905 }
906
907 // No duplicate is found, allocate a new entry and fill it.
908 entry = new NameSigHash();
909 entry->_name = name;
910 entry->_sig = sig;
911
912 // Insert into hash table
913 entry->_next = table[index];
914 table[index] = entry;
915
916 return true;
917 }
918
919 // Side-effects: populates the _local_interfaces field
920 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
921 const int itfs_len,
922 ConstantPool* const cp,
923 bool* const has_nonstatic_concrete_methods,
924 TRAPS) {
925 assert(stream != NULL, "invariant");
926 assert(cp != NULL, "invariant");
927 assert(has_nonstatic_concrete_methods != NULL, "invariant");
928
929 if (itfs_len == 0) {
930 _local_interfaces = Universe::the_empty_instance_klass_array();
931 } else {
932 assert(itfs_len > 0, "only called for len>0");
933 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
934
935 int index;
936 for (index = 0; index < itfs_len; index++) {
937 const u2 interface_index = stream->get_u2(CHECK);
938 Klass* interf;
939 check_property(
940 valid_klass_reference_at(interface_index),
941 "Interface name has bad constant pool index %u in class file %s",
942 interface_index, CHECK);
943 if (cp->tag_at(interface_index).is_klass()) {
944 interf = cp->resolved_klass_at(interface_index);
945 } else {
946 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
947
948 // Don't need to check legal name because it's checked when parsing constant pool.
949 // But need to make sure it's not an array type.
950 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
951 "Bad interface name in class file %s", CHECK);
952
953 // Call resolve_super so classcircularity is checked
954 interf = SystemDictionary::resolve_super_or_fail(
955 _class_name,
956 unresolved_klass,
957 Handle(THREAD, _loader_data->class_loader()),
958 _protection_domain,
959 false,
960 CHECK);
961 }
962
963 if (!interf->is_interface()) {
964 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
965 err_msg("class %s can not implement %s, because it is not an interface (%s)",
966 _class_name->as_klass_external_name(),
967 interf->external_name(),
968 interf->class_in_module_of_loader()));
969 }
970
971 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
972 *has_nonstatic_concrete_methods = true;
973 }
974 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
975 }
976
977 if (!_need_verify || itfs_len <= 1) {
978 return;
979 }
980
981 // Check if there's any duplicates in interfaces
982 ResourceMark rm(THREAD);
983 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
984 NameSigHash*,
985 HASH_ROW_SIZE);
986 initialize_hashtable(interface_names);
987 bool dup = false;
988 const Symbol* name = NULL;
989 {
990 debug_only(NoSafepointVerifier nsv;)
991 for (index = 0; index < itfs_len; index++) {
992 const InstanceKlass* const k = _local_interfaces->at(index);
993 name = k->name();
994 // If no duplicates, add (name, NULL) in hashtable interface_names.
995 if (!put_after_lookup(name, NULL, interface_names)) {
996 dup = true;
997 break;
998 }
999 }
1000 }
1001 if (dup) {
1002 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1003 name->as_C_string(), CHECK);
1004 }
1005 }
1006 }
1007
1008 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1009 int constantvalue_index,
1010 int signature_index,
1011 TRAPS) const {
1012 // Make sure the constant pool entry is of a type appropriate to this field
1013 guarantee_property(
1014 (constantvalue_index > 0 &&
1015 constantvalue_index < cp->length()),
1016 "Bad initial value index %u in ConstantValue attribute in class file %s",
1017 constantvalue_index, CHECK);
1018
1019 const constantTag value_type = cp->tag_at(constantvalue_index);
1020 switch(cp->basic_type_for_signature_at(signature_index)) {
1021 case T_LONG: {
1022 guarantee_property(value_type.is_long(),
1023 "Inconsistent constant value type in class file %s",
1024 CHECK);
1025 break;
1026 }
1027 case T_FLOAT: {
1028 guarantee_property(value_type.is_float(),
1029 "Inconsistent constant value type in class file %s",
1030 CHECK);
1031 break;
1032 }
1033 case T_DOUBLE: {
1034 guarantee_property(value_type.is_double(),
1035 "Inconsistent constant value type in class file %s",
1036 CHECK);
1037 break;
1038 }
1039 case T_BYTE:
1040 case T_CHAR:
1041 case T_SHORT:
1042 case T_BOOLEAN:
1043 case T_INT: {
1044 guarantee_property(value_type.is_int(),
1045 "Inconsistent constant value type in class file %s",
1046 CHECK);
1047 break;
1048 }
1049 case T_OBJECT: {
1050 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1051 && value_type.is_string()),
1052 "Bad string initial value in class file %s",
1053 CHECK);
1054 break;
1055 }
1056 default: {
1057 classfile_parse_error("Unable to set initial value %u in class file %s",
1058 constantvalue_index,
1059 CHECK);
1060 }
1061 }
1062 }
1063
1064 class AnnotationCollector : public ResourceObj{
1065 public:
1066 enum Location { _in_field, _in_method, _in_class };
1067 enum ID {
1068 _unknown = 0,
1069 _method_CallerSensitive,
1070 _method_ForceInline,
1071 _method_DontInline,
1072 _method_InjectedProfile,
1073 _method_LambdaForm_Compiled,
1074 _method_LambdaForm_Hidden,
1075 _method_HotSpotIntrinsicCandidate,
1076 _jdk_internal_vm_annotation_Contended,
1077 _field_Stable,
1078 _jdk_internal_vm_annotation_ReservedStackAccess,
1079 _annotation_LIMIT
1080 };
1081 const Location _location;
1082 int _annotations_present;
1083 u2 _contended_group;
1084
1085 AnnotationCollector(Location location)
1086 : _location(location), _annotations_present(0)
1087 {
1088 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1089 }
1090 // If this annotation name has an ID, report it (or _none).
1091 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1092 // Set the annotation name:
1093 void set_annotation(ID id) {
1094 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1095 _annotations_present |= nth_bit((int)id);
1096 }
1097
1098 void remove_annotation(ID id) {
1099 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1100 _annotations_present &= ~nth_bit((int)id);
1101 }
1102
1103 // Report if the annotation is present.
1104 bool has_any_annotations() const { return _annotations_present != 0; }
1105 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1106
1107 void set_contended_group(u2 group) { _contended_group = group; }
1108 u2 contended_group() const { return _contended_group; }
1109
1110 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1111
1112 void set_stable(bool stable) { set_annotation(_field_Stable); }
1113 bool is_stable() const { return has_annotation(_field_Stable); }
1114 };
1115
1116 // This class also doubles as a holder for metadata cleanup.
1117 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1118 private:
1119 ClassLoaderData* _loader_data;
1120 AnnotationArray* _field_annotations;
1121 AnnotationArray* _field_type_annotations;
1122 public:
1123 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1124 AnnotationCollector(_in_field),
1125 _loader_data(loader_data),
1126 _field_annotations(NULL),
1127 _field_type_annotations(NULL) {}
1128 ~FieldAnnotationCollector();
1129 void apply_to(FieldInfo* f);
1130 AnnotationArray* field_annotations() { return _field_annotations; }
1131 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1132
1133 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1134 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1135 };
1136
1137 class MethodAnnotationCollector : public AnnotationCollector{
1138 public:
1139 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1140 void apply_to(const methodHandle& m);
1141 };
1142
1143 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1144 public:
1145 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1146 void apply_to(InstanceKlass* ik);
1147 };
1148
1149
1150 static int skip_annotation_value(const u1*, int, int); // fwd decl
1151
1152 // Safely increment index by val if does not pass limit
1153 #define SAFE_ADD(index, limit, val) \
1154 if (index >= limit - val) return limit; \
1155 index += val;
1156
1157 // Skip an annotation. Return >=limit if there is any problem.
1158 static int skip_annotation(const u1* buffer, int limit, int index) {
1159 assert(buffer != NULL, "invariant");
1160 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1161 // value := switch (tag:u1) { ... }
1162 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1163 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1164 while (--nmem >= 0 && index < limit) {
1165 SAFE_ADD(index, limit, 2); // skip member
1166 index = skip_annotation_value(buffer, limit, index);
1167 }
1168 return index;
1169 }
1170
1171 // Skip an annotation value. Return >=limit if there is any problem.
1172 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1173 assert(buffer != NULL, "invariant");
1174
1175 // value := switch (tag:u1) {
1176 // case B, C, I, S, Z, D, F, J, c: con:u2;
1177 // case e: e_class:u2 e_name:u2;
1178 // case s: s_con:u2;
1179 // case [: do(nval:u2) {value};
1180 // case @: annotation;
1181 // case s: s_con:u2;
1182 // }
1183 SAFE_ADD(index, limit, 1); // read tag
1184 const u1 tag = buffer[index - 1];
1185 switch (tag) {
1186 case 'B':
1187 case 'C':
1188 case 'I':
1189 case 'S':
1190 case 'Z':
1191 case 'D':
1192 case 'F':
1193 case 'J':
1194 case 'c':
1195 case 's':
1196 SAFE_ADD(index, limit, 2); // skip con or s_con
1197 break;
1198 case 'e':
1199 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1200 break;
1201 case '[':
1202 {
1203 SAFE_ADD(index, limit, 2); // read nval
1204 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1205 while (--nval >= 0 && index < limit) {
1206 index = skip_annotation_value(buffer, limit, index);
1207 }
1208 }
1209 break;
1210 case '@':
1211 index = skip_annotation(buffer, limit, index);
1212 break;
1213 default:
1214 return limit; // bad tag byte
1215 }
1216 return index;
1217 }
1218
1219 // Sift through annotations, looking for those significant to the VM:
1220 static void parse_annotations(const ConstantPool* const cp,
1221 const u1* buffer, int limit,
1222 AnnotationCollector* coll,
1223 ClassLoaderData* loader_data,
1224 TRAPS) {
1225
1226 assert(cp != NULL, "invariant");
1227 assert(buffer != NULL, "invariant");
1228 assert(coll != NULL, "invariant");
1229 assert(loader_data != NULL, "invariant");
1230
1231 // annotations := do(nann:u2) {annotation}
1232 int index = 2; // read nann
1233 if (index >= limit) return;
1234 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1235 enum { // initial annotation layout
1236 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1237 count_off = 2, // u2 such as 1 (one value)
1238 member_off = 4, // utf8 such as 'value'
1239 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1240 e_tag_val = 'e',
1241 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1242 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1243 e_size = 11, // end of 'e' annotation
1244 c_tag_val = 'c', // payload is type
1245 c_con_off = 7, // utf8 payload, such as 'I'
1246 c_size = 9, // end of 'c' annotation
1247 s_tag_val = 's', // payload is String
1248 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1249 s_size = 9,
1250 min_size = 6 // smallest possible size (zero members)
1251 };
1252 // Cannot add min_size to index in case of overflow MAX_INT
1253 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1254 int index0 = index;
1255 index = skip_annotation(buffer, limit, index);
1256 const u1* const abase = buffer + index0;
1257 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1258 const int count = Bytes::get_Java_u2((address)abase + count_off);
1259 const Symbol* const aname = check_symbol_at(cp, atype);
1260 if (aname == NULL) break; // invalid annotation name
1261 const Symbol* member = NULL;
1262 if (count >= 1) {
1263 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1264 member = check_symbol_at(cp, member_index);
1265 if (member == NULL) break; // invalid member name
1266 }
1267
1268 // Here is where parsing particular annotations will take place.
1269 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1270 if (AnnotationCollector::_unknown == id) continue;
1271 coll->set_annotation(id);
1272
1273 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1274 // @Contended can optionally specify the contention group.
1275 //
1276 // Contended group defines the equivalence class over the fields:
1277 // the fields within the same contended group are not treated distinct.
1278 // The only exception is default group, which does not incur the
1279 // equivalence. Naturally, contention group for classes is meaningless.
1280 //
1281 // While the contention group is specified as String, annotation
1282 // values are already interned, and we might as well use the constant
1283 // pool index as the group tag.
1284 //
1285 u2 group_index = 0; // default contended group
1286 if (count == 1
1287 && s_size == (index - index0) // match size
1288 && s_tag_val == *(abase + tag_off)
1289 && member == vmSymbols::value_name()) {
1290 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1291 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1292 group_index = 0; // default contended group
1293 }
1294 }
1295 coll->set_contended_group(group_index);
1296 }
1297 }
1298 }
1299
1300
1301 // Parse attributes for a field.
1302 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1303 u2 attributes_count,
1304 bool is_static, u2 signature_index,
1305 u2* const constantvalue_index_addr,
1306 bool* const is_synthetic_addr,
1307 u2* const generic_signature_index_addr,
1308 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1309 TRAPS) {
1310 assert(cfs != NULL, "invariant");
1311 assert(constantvalue_index_addr != NULL, "invariant");
1312 assert(is_synthetic_addr != NULL, "invariant");
1313 assert(generic_signature_index_addr != NULL, "invariant");
1314 assert(parsed_annotations != NULL, "invariant");
1315 assert(attributes_count > 0, "attributes_count should be greater than 0");
1316
1317 u2 constantvalue_index = 0;
1318 u2 generic_signature_index = 0;
1319 bool is_synthetic = false;
1320 const u1* runtime_visible_annotations = NULL;
1321 int runtime_visible_annotations_length = 0;
1322 const u1* runtime_invisible_annotations = NULL;
1323 int runtime_invisible_annotations_length = 0;
1324 const u1* runtime_visible_type_annotations = NULL;
1325 int runtime_visible_type_annotations_length = 0;
1326 const u1* runtime_invisible_type_annotations = NULL;
1327 int runtime_invisible_type_annotations_length = 0;
1328 bool runtime_invisible_annotations_exists = false;
1329 bool runtime_invisible_type_annotations_exists = false;
1330 const ConstantPool* const cp = _cp;
1331
1332 while (attributes_count--) {
1333 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1334 const u2 attribute_name_index = cfs->get_u2_fast();
1335 const u4 attribute_length = cfs->get_u4_fast();
1336 check_property(valid_symbol_at(attribute_name_index),
1337 "Invalid field attribute index %u in class file %s",
1338 attribute_name_index,
1339 CHECK);
1340
1341 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1342 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1343 // ignore if non-static
1344 if (constantvalue_index != 0) {
1345 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1346 }
1347 check_property(
1348 attribute_length == 2,
1349 "Invalid ConstantValue field attribute length %u in class file %s",
1350 attribute_length, CHECK);
1351
1352 constantvalue_index = cfs->get_u2(CHECK);
1353 if (_need_verify) {
1354 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1355 }
1356 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1357 if (attribute_length != 0) {
1358 classfile_parse_error(
1359 "Invalid Synthetic field attribute length %u in class file %s",
1360 attribute_length, CHECK);
1361 }
1362 is_synthetic = true;
1363 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1364 if (attribute_length != 0) {
1365 classfile_parse_error(
1366 "Invalid Deprecated field attribute length %u in class file %s",
1367 attribute_length, CHECK);
1368 }
1369 } else if (_major_version >= JAVA_1_5_VERSION) {
1370 if (attribute_name == vmSymbols::tag_signature()) {
1371 if (generic_signature_index != 0) {
1372 classfile_parse_error(
1373 "Multiple Signature attributes for field in class file %s", CHECK);
1374 }
1375 if (attribute_length != 2) {
1376 classfile_parse_error(
1377 "Wrong size %u for field's Signature attribute in class file %s",
1378 attribute_length, CHECK);
1379 }
1380 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1381 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1382 if (runtime_visible_annotations != NULL) {
1383 classfile_parse_error(
1384 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1385 }
1386 runtime_visible_annotations_length = attribute_length;
1387 runtime_visible_annotations = cfs->current();
1388 assert(runtime_visible_annotations != NULL, "null visible annotations");
1389 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1390 parse_annotations(cp,
1391 runtime_visible_annotations,
1392 runtime_visible_annotations_length,
1393 parsed_annotations,
1394 _loader_data,
1395 CHECK);
1396 cfs->skip_u1_fast(runtime_visible_annotations_length);
1397 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1398 if (runtime_invisible_annotations_exists) {
1399 classfile_parse_error(
1400 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1401 }
1402 runtime_invisible_annotations_exists = true;
1403 if (PreserveAllAnnotations) {
1404 runtime_invisible_annotations_length = attribute_length;
1405 runtime_invisible_annotations = cfs->current();
1406 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1407 }
1408 cfs->skip_u1(attribute_length, CHECK);
1409 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1410 if (runtime_visible_type_annotations != NULL) {
1411 classfile_parse_error(
1412 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1413 }
1414 runtime_visible_type_annotations_length = attribute_length;
1415 runtime_visible_type_annotations = cfs->current();
1416 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1417 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1418 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1419 if (runtime_invisible_type_annotations_exists) {
1420 classfile_parse_error(
1421 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1422 } else {
1423 runtime_invisible_type_annotations_exists = true;
1424 }
1425 if (PreserveAllAnnotations) {
1426 runtime_invisible_type_annotations_length = attribute_length;
1427 runtime_invisible_type_annotations = cfs->current();
1428 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1429 }
1430 cfs->skip_u1(attribute_length, CHECK);
1431 } else {
1432 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1433 }
1434 } else {
1435 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1436 }
1437 }
1438
1439 *constantvalue_index_addr = constantvalue_index;
1440 *is_synthetic_addr = is_synthetic;
1441 *generic_signature_index_addr = generic_signature_index;
1442 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1443 runtime_visible_annotations_length,
1444 runtime_invisible_annotations,
1445 runtime_invisible_annotations_length,
1446 CHECK);
1447 parsed_annotations->set_field_annotations(a);
1448 a = assemble_annotations(runtime_visible_type_annotations,
1449 runtime_visible_type_annotations_length,
1450 runtime_invisible_type_annotations,
1451 runtime_invisible_type_annotations_length,
1452 CHECK);
1453 parsed_annotations->set_field_type_annotations(a);
1454 return;
1455 }
1456
1457
1458 // Field allocation types. Used for computing field offsets.
1459
1460 enum FieldAllocationType {
1461 STATIC_OOP, // Oops
1462 STATIC_BYTE, // Boolean, Byte, char
1463 STATIC_SHORT, // shorts
1464 STATIC_WORD, // ints
1465 STATIC_DOUBLE, // aligned long or double
1466 STATIC_FLATTENABLE, // flattenable field
1467 NONSTATIC_OOP,
1468 NONSTATIC_BYTE,
1469 NONSTATIC_SHORT,
1470 NONSTATIC_WORD,
1471 NONSTATIC_DOUBLE,
1472 NONSTATIC_FLATTENABLE,
1473 MAX_FIELD_ALLOCATION_TYPE,
1474 BAD_ALLOCATION_TYPE = -1
1475 };
1476
1477 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1478 BAD_ALLOCATION_TYPE, // 0
1479 BAD_ALLOCATION_TYPE, // 1
1480 BAD_ALLOCATION_TYPE, // 2
1481 BAD_ALLOCATION_TYPE, // 3
1482 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1483 NONSTATIC_SHORT, // T_CHAR = 5,
1484 NONSTATIC_WORD, // T_FLOAT = 6,
1485 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1486 NONSTATIC_BYTE, // T_BYTE = 8,
1487 NONSTATIC_SHORT, // T_SHORT = 9,
1488 NONSTATIC_WORD, // T_INT = 10,
1489 NONSTATIC_DOUBLE, // T_LONG = 11,
1490 NONSTATIC_OOP, // T_OBJECT = 12,
1491 NONSTATIC_OOP, // T_ARRAY = 13,
1492 NONSTATIC_OOP, // T_VALUETYPE = 14,
1493 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1494 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1495 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1496 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1497 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1498 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20,
1499 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21,
1500 BAD_ALLOCATION_TYPE, // 0
1501 BAD_ALLOCATION_TYPE, // 1
1502 BAD_ALLOCATION_TYPE, // 2
1503 BAD_ALLOCATION_TYPE, // 3
1504 STATIC_BYTE , // T_BOOLEAN = 4,
1505 STATIC_SHORT, // T_CHAR = 5,
1506 STATIC_WORD, // T_FLOAT = 6,
1507 STATIC_DOUBLE, // T_DOUBLE = 7,
1508 STATIC_BYTE, // T_BYTE = 8,
1509 STATIC_SHORT, // T_SHORT = 9,
1510 STATIC_WORD, // T_INT = 10,
1511 STATIC_DOUBLE, // T_LONG = 11,
1512 STATIC_OOP, // T_OBJECT = 12,
1513 STATIC_OOP, // T_ARRAY = 13,
1514 STATIC_OOP, // T_VALUETYPE = 14,
1515 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1516 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1517 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1518 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1519 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1520 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20,
1521 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21,
1522 };
1523
1524 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1525 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1526 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1527 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1528 if (is_flattenable) {
1529 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1530 }
1531 return result;
1532 }
1533
1534 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1535 public:
1536 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1537
1538 FieldAllocationCount() {
1539 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1540 count[i] = 0;
1541 }
1542 }
1543
1544 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1545 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1546 if (atype != BAD_ALLOCATION_TYPE) {
1547 // Make sure there is no overflow with injected fields.
1548 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1549 count[atype]++;
1550 }
1551 return atype;
1552 }
1553 };
1554
1555 // Side-effects: populates the _fields, _fields_annotations,
1556 // _fields_type_annotations fields
1557 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1558 bool is_interface,
1559 bool is_value_type,
1560 FieldAllocationCount* const fac,
1561 ConstantPool* cp,
1562 const int cp_size,
1563 u2* const java_fields_count_ptr,
1564 TRAPS) {
1565
1566 assert(cfs != NULL, "invariant");
1567 assert(fac != NULL, "invariant");
1568 assert(cp != NULL, "invariant");
1569 assert(java_fields_count_ptr != NULL, "invariant");
1570
1571 assert(NULL == _fields, "invariant");
1572 assert(NULL == _fields_annotations, "invariant");
1573 assert(NULL == _fields_type_annotations, "invariant");
1574
1575 cfs->guarantee_more(2, CHECK); // length
1576 const u2 length = cfs->get_u2_fast();
1577 *java_fields_count_ptr = length;
1578
1579 int num_injected = 0;
1580 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1581 &num_injected);
1582
1583 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1584
1585 // The field array starts with tuples of shorts
1586 // [access, name index, sig index, initial value index, byte offset].
1587 // A generic signature slot only exists for field with generic
1588 // signature attribute. And the access flag is set with
1589 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1590 // signature slots are at the end of the field array and after all
1591 // other fields data.
1592 //
1593 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1594 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1595 // ...
1596 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1597 // [generic signature index]
1598 // [generic signature index]
1599 // ...
1600 //
1601 // Allocate a temporary resource array for field data. For each field,
1602 // a slot is reserved in the temporary array for the generic signature
1603 // index. After parsing all fields, the data are copied to a permanent
1604 // array and any unused slots will be discarded.
1605 ResourceMark rm(THREAD);
1606 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1607 u2,
1608 total_fields * (FieldInfo::field_slots + 1));
1609
1610 // The generic signature slots start after all other fields' data.
1611 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1612 int num_generic_signature = 0;
1613 for (int n = 0; n < length; n++) {
1614 // access_flags, name_index, descriptor_index, attributes_count
1615 cfs->guarantee_more(8, CHECK);
1616
1617 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1618 // JVM_ACC_FLATTENABLE is defined for class file version 55 and later
1619 if (supports_value_types()) {
1620 recognized_modifiers |= JVM_ACC_FLATTENABLE;
1621 }
1622
1623 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1624 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1625 AccessFlags access_flags;
1626 access_flags.set_flags(flags);
1627
1628 const u2 name_index = cfs->get_u2_fast();
1629 check_property(valid_symbol_at(name_index),
1630 "Invalid constant pool index %u for field name in class file %s",
1631 name_index, CHECK);
1632 const Symbol* const name = cp->symbol_at(name_index);
1633 verify_legal_field_name(name, CHECK);
1634
1635 const u2 signature_index = cfs->get_u2_fast();
1636 check_property(valid_symbol_at(signature_index),
1637 "Invalid constant pool index %u for field signature in class file %s",
1638 signature_index, CHECK);
1639 const Symbol* const sig = cp->symbol_at(signature_index);
1640 verify_legal_field_signature(name, sig, CHECK);
1641 if (access_flags.is_flattenable()) {
1642 // Array flattenability cannot be specified. Arrays of value classes are
1643 // are always flattenable. Arrays of other classes are not flattenable.
1644 if (sig->utf8_length() > 1 && sig->byte_at(0) == '[') {
1645 classfile_parse_error(
1646 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1647 " ACC_FLATTENABLE cannot be specified for an array",
1648 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1649 }
1650 _has_flattenable_fields = true;
1651 }
1652
1653 u2 constantvalue_index = 0;
1654 bool is_synthetic = false;
1655 u2 generic_signature_index = 0;
1656 const bool is_static = access_flags.is_static();
1657 FieldAnnotationCollector parsed_annotations(_loader_data);
1658
1659 const u2 attributes_count = cfs->get_u2_fast();
1660 if (attributes_count > 0) {
1661 parse_field_attributes(cfs,
1662 attributes_count,
1663 is_static,
1664 signature_index,
1665 &constantvalue_index,
1666 &is_synthetic,
1667 &generic_signature_index,
1668 &parsed_annotations,
1669 CHECK);
1670
1671 if (parsed_annotations.field_annotations() != NULL) {
1672 if (_fields_annotations == NULL) {
1673 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1674 _loader_data, length, NULL,
1675 CHECK);
1676 }
1677 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1678 parsed_annotations.set_field_annotations(NULL);
1679 }
1680 if (parsed_annotations.field_type_annotations() != NULL) {
1681 if (_fields_type_annotations == NULL) {
1682 _fields_type_annotations =
1683 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1684 length,
1685 NULL,
1686 CHECK);
1687 }
1688 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1689 parsed_annotations.set_field_type_annotations(NULL);
1690 }
1691
1692 if (is_synthetic) {
1693 access_flags.set_is_synthetic();
1694 }
1695 if (generic_signature_index != 0) {
1696 access_flags.set_field_has_generic_signature();
1697 fa[generic_signature_slot] = generic_signature_index;
1698 generic_signature_slot ++;
1699 num_generic_signature ++;
1700 }
1701 }
1702
1703 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1704 field->initialize(access_flags.as_short(),
1705 name_index,
1706 signature_index,
1707 constantvalue_index);
1708 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1709
1710 // Remember how many oops we encountered and compute allocation type
1711 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1712 field->set_allocation_type(atype);
1713
1714 // After field is initialized with type, we can augment it with aux info
1715 if (parsed_annotations.has_any_annotations())
1716 parsed_annotations.apply_to(field);
1717 }
1718
1719 int index = length;
1720 if (num_injected != 0) {
1721 for (int n = 0; n < num_injected; n++) {
1722 // Check for duplicates
1723 if (injected[n].may_be_java) {
1724 const Symbol* const name = injected[n].name();
1725 const Symbol* const signature = injected[n].signature();
1726 bool duplicate = false;
1727 for (int i = 0; i < length; i++) {
1728 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1729 if (name == cp->symbol_at(f->name_index()) &&
1730 signature == cp->symbol_at(f->signature_index())) {
1731 // Symbol is desclared in Java so skip this one
1732 duplicate = true;
1733 break;
1734 }
1735 }
1736 if (duplicate) {
1737 // These will be removed from the field array at the end
1738 continue;
1739 }
1740 }
1741
1742 // Injected field
1743 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1744 field->initialize(JVM_ACC_FIELD_INTERNAL,
1745 injected[n].name_index,
1746 injected[n].signature_index,
1747 0);
1748
1749 const BasicType type = FieldType::basic_type(injected[n].signature());
1750
1751 // Remember how many oops we encountered and compute allocation type
1752 const FieldAllocationType atype = fac->update(false, type, false);
1753 field->set_allocation_type(atype);
1754 index++;
1755 }
1756 }
1757
1758 if (is_value_type) {
1759 index = length + num_injected;
1760 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1761 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1762 vmSymbols::default_value_name_enum,
1763 vmSymbols::java_lang_Object_enum,
1764 0);
1765 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1766 const FieldAllocationType atype = fac->update(true, type, false);
1767 field->set_allocation_type(atype);
1768 index++;
1769 }
1770
1771 assert(NULL == _fields, "invariant");
1772
1773 _fields =
1774 MetadataFactory::new_array<u2>(_loader_data,
1775 index * FieldInfo::field_slots + num_generic_signature,
1776 CHECK);
1777 // Sometimes injected fields already exist in the Java source so
1778 // the fields array could be too long. In that case the
1779 // fields array is trimed. Also unused slots that were reserved
1780 // for generic signature indexes are discarded.
1781 {
1782 int i = 0;
1783 for (; i < index * FieldInfo::field_slots; i++) {
1784 _fields->at_put(i, fa[i]);
1785 }
1786 for (int j = total_fields * FieldInfo::field_slots;
1787 j < generic_signature_slot; j++) {
1788 _fields->at_put(i++, fa[j]);
1789 }
1790 assert(_fields->length() == i, "");
1791 }
1792
1793 if (_need_verify && length > 1) {
1794 // Check duplicated fields
1795 ResourceMark rm(THREAD);
1796 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1797 THREAD, NameSigHash*, HASH_ROW_SIZE);
1798 initialize_hashtable(names_and_sigs);
1799 bool dup = false;
1800 const Symbol* name = NULL;
1801 const Symbol* sig = NULL;
1802 {
1803 debug_only(NoSafepointVerifier nsv;)
1804 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1805 name = fs.name();
1806 sig = fs.signature();
1807 // If no duplicates, add name/signature in hashtable names_and_sigs.
1808 if (!put_after_lookup(name, sig, names_and_sigs)) {
1809 dup = true;
1810 break;
1811 }
1812 }
1813 }
1814 if (dup) {
1815 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1816 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1817 }
1818 }
1819 }
1820
1821
1822 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1823 u4 code_length,
1824 u4 exception_table_length,
1825 TRAPS) {
1826 assert(cfs != NULL, "invariant");
1827
1828 const unsafe_u2* const exception_table_start = cfs->current();
1829 assert(exception_table_start != NULL, "null exception table");
1830
1831 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1832 // end_pc,
1833 // handler_pc,
1834 // catch_type_index
1835
1836 // Will check legal target after parsing code array in verifier.
1837 if (_need_verify) {
1838 for (unsigned int i = 0; i < exception_table_length; i++) {
1839 const u2 start_pc = cfs->get_u2_fast();
1840 const u2 end_pc = cfs->get_u2_fast();
1841 const u2 handler_pc = cfs->get_u2_fast();
1842 const u2 catch_type_index = cfs->get_u2_fast();
1843 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1844 "Illegal exception table range in class file %s",
1845 CHECK_NULL);
1846 guarantee_property(handler_pc < code_length,
1847 "Illegal exception table handler in class file %s",
1848 CHECK_NULL);
1849 if (catch_type_index != 0) {
1850 guarantee_property(valid_klass_reference_at(catch_type_index),
1851 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1852 }
1853 }
1854 } else {
1855 cfs->skip_u2_fast(exception_table_length * 4);
1856 }
1857 return exception_table_start;
1858 }
1859
1860 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1861 u4 code_length,
1862 CompressedLineNumberWriteStream**const write_stream,
1863 TRAPS) {
1864
1865 const ClassFileStream* const cfs = _stream;
1866 unsigned int num_entries = cfs->get_u2(CHECK);
1867
1868 // Each entry is a u2 start_pc, and a u2 line_number
1869 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1870
1871 // Verify line number attribute and table length
1872 check_property(
1873 code_attribute_length == sizeof(u2) + length_in_bytes,
1874 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1875
1876 cfs->guarantee_more(length_in_bytes, CHECK);
1877
1878 if ((*write_stream) == NULL) {
1879 if (length_in_bytes > fixed_buffer_size) {
1880 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1881 } else {
1882 (*write_stream) = new CompressedLineNumberWriteStream(
1883 _linenumbertable_buffer, fixed_buffer_size);
1884 }
1885 }
1886
1887 while (num_entries-- > 0) {
1888 const u2 bci = cfs->get_u2_fast(); // start_pc
1889 const u2 line = cfs->get_u2_fast(); // line_number
1890 guarantee_property(bci < code_length,
1891 "Invalid pc in LineNumberTable in class file %s", CHECK);
1892 (*write_stream)->write_pair(bci, line);
1893 }
1894 }
1895
1896
1897 class LVT_Hash : public AllStatic {
1898 public:
1899
1900 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1901 /*
1902 * 3-tuple start_bci/length/slot has to be unique key,
1903 * so the following comparison seems to be redundant:
1904 * && elem->name_cp_index == entry->_elem->name_cp_index
1905 */
1906 return (e0.start_bci == e1.start_bci &&
1907 e0.length == e1.length &&
1908 e0.name_cp_index == e1.name_cp_index &&
1909 e0.slot == e1.slot);
1910 }
1911
1912 static unsigned int hash(LocalVariableTableElement const& e0) {
1913 unsigned int raw_hash = e0.start_bci;
1914
1915 raw_hash = e0.length + raw_hash * 37;
1916 raw_hash = e0.name_cp_index + raw_hash * 37;
1917 raw_hash = e0.slot + raw_hash * 37;
1918
1919 return raw_hash;
1920 }
1921 };
1922
1923
1924 // Class file LocalVariableTable elements.
1925 class Classfile_LVT_Element {
1926 public:
1927 u2 start_bci;
1928 u2 length;
1929 u2 name_cp_index;
1930 u2 descriptor_cp_index;
1931 u2 slot;
1932 };
1933
1934 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1935 LocalVariableTableElement* const lvt) {
1936 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1937 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1938 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1939 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1940 lvt->signature_cp_index = 0;
1941 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1942 }
1943
1944 // Function is used to parse both attributes:
1945 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1946 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1947 u4 code_length,
1948 u2 max_locals,
1949 u4 code_attribute_length,
1950 u2* const localvariable_table_length,
1951 bool isLVTT,
1952 TRAPS) {
1953 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1954 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1955 const unsigned int size =
1956 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1957
1958 const ConstantPool* const cp = _cp;
1959
1960 // Verify local variable table attribute has right length
1961 if (_need_verify) {
1962 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1963 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1964 }
1965
1966 const unsafe_u2* const localvariable_table_start = cfs->current();
1967 assert(localvariable_table_start != NULL, "null local variable table");
1968 if (!_need_verify) {
1969 cfs->skip_u2_fast(size);
1970 } else {
1971 cfs->guarantee_more(size * 2, CHECK_NULL);
1972 for(int i = 0; i < (*localvariable_table_length); i++) {
1973 const u2 start_pc = cfs->get_u2_fast();
1974 const u2 length = cfs->get_u2_fast();
1975 const u2 name_index = cfs->get_u2_fast();
1976 const u2 descriptor_index = cfs->get_u2_fast();
1977 const u2 index = cfs->get_u2_fast();
1978 // Assign to a u4 to avoid overflow
1979 const u4 end_pc = (u4)start_pc + (u4)length;
1980
1981 if (start_pc >= code_length) {
1982 classfile_parse_error(
1983 "Invalid start_pc %u in %s in class file %s",
1984 start_pc, tbl_name, CHECK_NULL);
1985 }
1986 if (end_pc > code_length) {
1987 classfile_parse_error(
1988 "Invalid length %u in %s in class file %s",
1989 length, tbl_name, CHECK_NULL);
1990 }
1991 const int cp_size = cp->length();
1992 guarantee_property(valid_symbol_at(name_index),
1993 "Name index %u in %s has bad constant type in class file %s",
1994 name_index, tbl_name, CHECK_NULL);
1995 guarantee_property(valid_symbol_at(descriptor_index),
1996 "Signature index %u in %s has bad constant type in class file %s",
1997 descriptor_index, tbl_name, CHECK_NULL);
1998
1999 const Symbol* const name = cp->symbol_at(name_index);
2000 const Symbol* const sig = cp->symbol_at(descriptor_index);
2001 verify_legal_field_name(name, CHECK_NULL);
2002 u2 extra_slot = 0;
2003 if (!isLVTT) {
2004 verify_legal_field_signature(name, sig, CHECK_NULL);
2005
2006 // 4894874: check special cases for double and long local variables
2007 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2008 sig == vmSymbols::type_signature(T_LONG)) {
2009 extra_slot = 1;
2010 }
2011 }
2012 guarantee_property((index + extra_slot) < max_locals,
2013 "Invalid index %u in %s in class file %s",
2014 index, tbl_name, CHECK_NULL);
2015 }
2016 }
2017 return localvariable_table_start;
2018 }
2019
2020
2021 void ClassFileParser::parse_type_array(u2 array_length,
2022 u4 code_length,
2023 u4* const u1_index,
2024 u4* const u2_index,
2025 u1* const u1_array,
2026 u2* const u2_array,
2027 TRAPS) {
2028 const ClassFileStream* const cfs = _stream;
2029 u2 index = 0; // index in the array with long/double occupying two slots
2030 u4 i1 = *u1_index;
2031 u4 i2 = *u2_index + 1;
2032 for(int i = 0; i < array_length; i++) {
2033 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
2034 index++;
2035 if (tag == ITEM_Long || tag == ITEM_Double) {
2036 index++;
2037 } else if (tag == ITEM_Object) {
2038 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
2039 guarantee_property(valid_klass_reference_at(class_index),
2040 "Bad class index %u in StackMap in class file %s",
2041 class_index, CHECK);
2042 } else if (tag == ITEM_Uninitialized) {
2043 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
2044 guarantee_property(
2045 offset < code_length,
2046 "Bad uninitialized type offset %u in StackMap in class file %s",
2047 offset, CHECK);
2048 } else {
2049 guarantee_property(
2050 tag <= (u1)ITEM_Uninitialized,
2051 "Unknown variable type %u in StackMap in class file %s",
2052 tag, CHECK);
2053 }
2054 }
2055 u2_array[*u2_index] = index;
2056 *u1_index = i1;
2057 *u2_index = i2;
2058 }
2059
2060 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2061 u4 code_attribute_length,
2062 bool need_verify,
2063 TRAPS) {
2064 assert(cfs != NULL, "invariant");
2065
2066 if (0 == code_attribute_length) {
2067 return NULL;
2068 }
2069
2070 const u1* const stackmap_table_start = cfs->current();
2071 assert(stackmap_table_start != NULL, "null stackmap table");
2072
2073 // check code_attribute_length first
2074 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2075
2076 if (!need_verify && !DumpSharedSpaces) {
2077 return NULL;
2078 }
2079 return stackmap_table_start;
2080 }
2081
2082 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2083 u2* const checked_exceptions_length,
2084 u4 method_attribute_length,
2085 TRAPS) {
2086 assert(cfs != NULL, "invariant");
2087 assert(checked_exceptions_length != NULL, "invariant");
2088
2089 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2090 *checked_exceptions_length = cfs->get_u2_fast();
2091 const unsigned int size =
2092 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2093 const unsafe_u2* const checked_exceptions_start = cfs->current();
2094 assert(checked_exceptions_start != NULL, "null checked exceptions");
2095 if (!_need_verify) {
2096 cfs->skip_u2_fast(size);
2097 } else {
2098 // Verify each value in the checked exception table
2099 u2 checked_exception;
2100 const u2 len = *checked_exceptions_length;
2101 cfs->guarantee_more(2 * len, CHECK_NULL);
2102 for (int i = 0; i < len; i++) {
2103 checked_exception = cfs->get_u2_fast();
2104 check_property(
2105 valid_klass_reference_at(checked_exception),
2106 "Exception name has bad type at constant pool %u in class file %s",
2107 checked_exception, CHECK_NULL);
2108 }
2109 }
2110 // check exceptions attribute length
2111 if (_need_verify) {
2112 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2113 sizeof(u2) * size),
2114 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2115 }
2116 return checked_exceptions_start;
2117 }
2118
2119 void ClassFileParser::throwIllegalSignature(const char* type,
2120 const Symbol* name,
2121 const Symbol* sig,
2122 TRAPS) const {
2123 assert(name != NULL, "invariant");
2124 assert(sig != NULL, "invariant");
2125
2126 ResourceMark rm(THREAD);
2127 Exceptions::fthrow(THREAD_AND_LOCATION,
2128 vmSymbols::java_lang_ClassFormatError(),
2129 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2130 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2131 }
2132
2133 AnnotationCollector::ID
2134 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2135 const Symbol* name) {
2136 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2137 // Privileged code can use all annotations. Other code silently drops some.
2138 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2139 loader_data->is_platform_class_loader_data() ||
2140 loader_data->is_unsafe_anonymous();
2141 switch (sid) {
2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2143 if (_location != _in_method) break; // only allow for methods
2144 if (!privileged) break; // only allow in privileged code
2145 return _method_CallerSensitive;
2146 }
2147 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2148 if (_location != _in_method) break; // only allow for methods
2149 if (!privileged) break; // only allow in privileged code
2150 return _method_ForceInline;
2151 }
2152 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2153 if (_location != _in_method) break; // only allow for methods
2154 if (!privileged) break; // only allow in privileged code
2155 return _method_DontInline;
2156 }
2157 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2158 if (_location != _in_method) break; // only allow for methods
2159 if (!privileged) break; // only allow in privileged code
2160 return _method_InjectedProfile;
2161 }
2162 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2163 if (_location != _in_method) break; // only allow for methods
2164 if (!privileged) break; // only allow in privileged code
2165 return _method_LambdaForm_Compiled;
2166 }
2167 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2168 if (_location != _in_method) break; // only allow for methods
2169 if (!privileged) break; // only allow in privileged code
2170 return _method_LambdaForm_Hidden;
2171 }
2172 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2173 if (_location != _in_method) break; // only allow for methods
2174 if (!privileged) break; // only allow in privileged code
2175 return _method_HotSpotIntrinsicCandidate;
2176 }
2177 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2178 if (_location != _in_field) break; // only allow for fields
2179 if (!privileged) break; // only allow in privileged code
2180 return _field_Stable;
2181 }
2182 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2183 if (_location != _in_field && _location != _in_class) {
2184 break; // only allow for fields and classes
2185 }
2186 if (!EnableContended || (RestrictContended && !privileged)) {
2187 break; // honor privileges
2188 }
2189 return _jdk_internal_vm_annotation_Contended;
2190 }
2191 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2192 if (_location != _in_method) break; // only allow for methods
2193 if (RestrictReservedStack && !privileged) break; // honor privileges
2194 return _jdk_internal_vm_annotation_ReservedStackAccess;
2195 }
2196 default: {
2197 break;
2198 }
2199 }
2200 return AnnotationCollector::_unknown;
2201 }
2202
2203 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2204 if (is_contended())
2205 f->set_contended_group(contended_group());
2206 if (is_stable())
2207 f->set_stable(true);
2208 }
2209
2210 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2211 // If there's an error deallocate metadata for field annotations
2212 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2213 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2214 }
2215
2216 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2217 if (has_annotation(_method_CallerSensitive))
2218 m->set_caller_sensitive(true);
2219 if (has_annotation(_method_ForceInline))
2220 m->set_force_inline(true);
2221 if (has_annotation(_method_DontInline))
2222 m->set_dont_inline(true);
2223 if (has_annotation(_method_InjectedProfile))
2224 m->set_has_injected_profile(true);
2225 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2226 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2227 if (has_annotation(_method_LambdaForm_Hidden))
2228 m->set_hidden(true);
2229 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2230 m->set_intrinsic_candidate(true);
2231 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2232 m->set_has_reserved_stack_access(true);
2233 }
2234
2235 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2236 assert(ik != NULL, "invariant");
2237 ik->set_is_contended(is_contended());
2238 }
2239
2240 #define MAX_ARGS_SIZE 255
2241 #define MAX_CODE_SIZE 65535
2242 #define INITIAL_MAX_LVT_NUMBER 256
2243
2244 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2245 *
2246 * Rules for LVT's and LVTT's are:
2247 * - There can be any number of LVT's and LVTT's.
2248 * - If there are n LVT's, it is the same as if there was just
2249 * one LVT containing all the entries from the n LVT's.
2250 * - There may be no more than one LVT entry per local variable.
2251 * Two LVT entries are 'equal' if these fields are the same:
2252 * start_pc, length, name, slot
2253 * - There may be no more than one LVTT entry per each LVT entry.
2254 * Each LVTT entry has to match some LVT entry.
2255 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2256 */
2257 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2258 int lvt_cnt,
2259 u2* const localvariable_table_length,
2260 const unsafe_u2** const localvariable_table_start,
2261 int lvtt_cnt,
2262 u2* const localvariable_type_table_length,
2263 const unsafe_u2** const localvariable_type_table_start,
2264 TRAPS) {
2265
2266 ResourceMark rm(THREAD);
2267
2268 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2269 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2270
2271 LVT_HashTable* const table = new LVT_HashTable();
2272
2273 // To fill LocalVariableTable in
2274 const Classfile_LVT_Element* cf_lvt;
2275 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2276
2277 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2278 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2279 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2280 copy_lvt_element(&cf_lvt[idx], lvt);
2281 // If no duplicates, add LVT elem in hashtable.
2282 if (table->put(*lvt, lvt) == false
2283 && _need_verify
2284 && _major_version >= JAVA_1_5_VERSION) {
2285 classfile_parse_error("Duplicated LocalVariableTable attribute "
2286 "entry for '%s' in class file %s",
2287 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2288 CHECK);
2289 }
2290 }
2291 }
2292
2293 // To merge LocalVariableTable and LocalVariableTypeTable
2294 const Classfile_LVT_Element* cf_lvtt;
2295 LocalVariableTableElement lvtt_elem;
2296
2297 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2298 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2299 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2300 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2301 LocalVariableTableElement** entry = table->get(lvtt_elem);
2302 if (entry == NULL) {
2303 if (_need_verify) {
2304 classfile_parse_error("LVTT entry for '%s' in class file %s "
2305 "does not match any LVT entry",
2306 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2307 CHECK);
2308 }
2309 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2310 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2311 "entry for '%s' in class file %s",
2312 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2313 CHECK);
2314 } else {
2315 // to add generic signatures into LocalVariableTable
2316 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2317 }
2318 }
2319 }
2320 }
2321
2322
2323 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2324 const u1* runtime_visible_annotations,
2325 int runtime_visible_annotations_length,
2326 const u1* runtime_invisible_annotations,
2327 int runtime_invisible_annotations_length,
2328 const u1* runtime_visible_parameter_annotations,
2329 int runtime_visible_parameter_annotations_length,
2330 const u1* runtime_invisible_parameter_annotations,
2331 int runtime_invisible_parameter_annotations_length,
2332 const u1* runtime_visible_type_annotations,
2333 int runtime_visible_type_annotations_length,
2334 const u1* runtime_invisible_type_annotations,
2335 int runtime_invisible_type_annotations_length,
2336 const u1* annotation_default,
2337 int annotation_default_length,
2338 TRAPS) {
2339
2340 AnnotationArray* a;
2341
2342 if (runtime_visible_annotations_length +
2343 runtime_invisible_annotations_length > 0) {
2344 a = assemble_annotations(runtime_visible_annotations,
2345 runtime_visible_annotations_length,
2346 runtime_invisible_annotations,
2347 runtime_invisible_annotations_length,
2348 CHECK);
2349 cm->set_method_annotations(a);
2350 }
2351
2352 if (runtime_visible_parameter_annotations_length +
2353 runtime_invisible_parameter_annotations_length > 0) {
2354 a = assemble_annotations(runtime_visible_parameter_annotations,
2355 runtime_visible_parameter_annotations_length,
2356 runtime_invisible_parameter_annotations,
2357 runtime_invisible_parameter_annotations_length,
2358 CHECK);
2359 cm->set_parameter_annotations(a);
2360 }
2361
2362 if (annotation_default_length > 0) {
2363 a = assemble_annotations(annotation_default,
2364 annotation_default_length,
2365 NULL,
2366 0,
2367 CHECK);
2368 cm->set_default_annotations(a);
2369 }
2370
2371 if (runtime_visible_type_annotations_length +
2372 runtime_invisible_type_annotations_length > 0) {
2373 a = assemble_annotations(runtime_visible_type_annotations,
2374 runtime_visible_type_annotations_length,
2375 runtime_invisible_type_annotations,
2376 runtime_invisible_type_annotations_length,
2377 CHECK);
2378 cm->set_type_annotations(a);
2379 }
2380 }
2381
2382
2383 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2384 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2385 // Method* to save footprint, so we only know the size of the resulting Method* when the
2386 // entire method attribute is parsed.
2387 //
2388 // The promoted_flags parameter is used to pass relevant access_flags
2389 // from the method back up to the containing klass. These flag values
2390 // are added to klass's access_flags.
2391
2392 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2393 bool is_interface,
2394 bool is_value_type,
2395 const ConstantPool* cp,
2396 AccessFlags* const promoted_flags,
2397 TRAPS) {
2398 assert(cfs != NULL, "invariant");
2399 assert(cp != NULL, "invariant");
2400 assert(promoted_flags != NULL, "invariant");
2401
2402 ResourceMark rm(THREAD);
2403 // Parse fixed parts:
2404 // access_flags, name_index, descriptor_index, attributes_count
2405 cfs->guarantee_more(8, CHECK_NULL);
2406
2407 int flags = cfs->get_u2_fast();
2408 const u2 name_index = cfs->get_u2_fast();
2409 const int cp_size = cp->length();
2410 check_property(
2411 valid_symbol_at(name_index),
2412 "Illegal constant pool index %u for method name in class file %s",
2413 name_index, CHECK_NULL);
2414 const Symbol* const name = cp->symbol_at(name_index);
2415 verify_legal_method_name(name, CHECK_NULL);
2416
2417 const u2 signature_index = cfs->get_u2_fast();
2418 guarantee_property(
2419 valid_symbol_at(signature_index),
2420 "Illegal constant pool index %u for method signature in class file %s",
2421 signature_index, CHECK_NULL);
2422 const Symbol* const signature = cp->symbol_at(signature_index);
2423
2424 if (name == vmSymbols::class_initializer_name()) {
2425 // We ignore the other access flags for a valid class initializer.
2426 // (JVM Spec 2nd ed., chapter 4.6)
2427 if (_major_version < 51) { // backward compatibility
2428 flags = JVM_ACC_STATIC;
2429 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2430 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2431 } else {
2432 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2433 }
2434 } else {
2435 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2436 }
2437
2438 if (name == vmSymbols::object_initializer_name()) {
2439 if (is_interface) {
2440 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2441 /* TBD: uncomment when javac stops generating <init>() for value types.
2442 } else if (is_value_type) {
2443 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL);
2444 */
2445 }
2446 }
2447
2448 int args_size = -1; // only used when _need_verify is true
2449 if (_need_verify) {
2450 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2451 verify_legal_method_signature(name, signature, CHECK_NULL);
2452 if (args_size > MAX_ARGS_SIZE) {
2453 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2454 }
2455 }
2456
2457 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2458
2459 // Default values for code and exceptions attribute elements
2460 u2 max_stack = 0;
2461 u2 max_locals = 0;
2462 u4 code_length = 0;
2463 const u1* code_start = 0;
2464 u2 exception_table_length = 0;
2465 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2466 Array<int>* exception_handlers = Universe::the_empty_int_array();
2467 u2 checked_exceptions_length = 0;
2468 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2469 CompressedLineNumberWriteStream* linenumber_table = NULL;
2470 int linenumber_table_length = 0;
2471 int total_lvt_length = 0;
2472 u2 lvt_cnt = 0;
2473 u2 lvtt_cnt = 0;
2474 bool lvt_allocated = false;
2475 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2476 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2477 u2* localvariable_table_length = NULL;
2478 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2479 u2* localvariable_type_table_length = NULL;
2480 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2481 int method_parameters_length = -1;
2482 const u1* method_parameters_data = NULL;
2483 bool method_parameters_seen = false;
2484 bool parsed_code_attribute = false;
2485 bool parsed_checked_exceptions_attribute = false;
2486 bool parsed_stackmap_attribute = false;
2487 // stackmap attribute - JDK1.5
2488 const u1* stackmap_data = NULL;
2489 int stackmap_data_length = 0;
2490 u2 generic_signature_index = 0;
2491 MethodAnnotationCollector parsed_annotations;
2492 const u1* runtime_visible_annotations = NULL;
2493 int runtime_visible_annotations_length = 0;
2494 const u1* runtime_invisible_annotations = NULL;
2495 int runtime_invisible_annotations_length = 0;
2496 const u1* runtime_visible_parameter_annotations = NULL;
2497 int runtime_visible_parameter_annotations_length = 0;
2498 const u1* runtime_invisible_parameter_annotations = NULL;
2499 int runtime_invisible_parameter_annotations_length = 0;
2500 const u1* runtime_visible_type_annotations = NULL;
2501 int runtime_visible_type_annotations_length = 0;
2502 const u1* runtime_invisible_type_annotations = NULL;
2503 int runtime_invisible_type_annotations_length = 0;
2504 bool runtime_invisible_annotations_exists = false;
2505 bool runtime_invisible_type_annotations_exists = false;
2506 bool runtime_invisible_parameter_annotations_exists = false;
2507 const u1* annotation_default = NULL;
2508 int annotation_default_length = 0;
2509
2510 // Parse code and exceptions attribute
2511 u2 method_attributes_count = cfs->get_u2_fast();
2512 while (method_attributes_count--) {
2513 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2514 const u2 method_attribute_name_index = cfs->get_u2_fast();
2515 const u4 method_attribute_length = cfs->get_u4_fast();
2516 check_property(
2517 valid_symbol_at(method_attribute_name_index),
2518 "Invalid method attribute name index %u in class file %s",
2519 method_attribute_name_index, CHECK_NULL);
2520
2521 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2522 if (method_attribute_name == vmSymbols::tag_code()) {
2523 // Parse Code attribute
2524 if (_need_verify) {
2525 guarantee_property(
2526 !access_flags.is_native() && !access_flags.is_abstract(),
2527 "Code attribute in native or abstract methods in class file %s",
2528 CHECK_NULL);
2529 }
2530 if (parsed_code_attribute) {
2531 classfile_parse_error("Multiple Code attributes in class file %s",
2532 CHECK_NULL);
2533 }
2534 parsed_code_attribute = true;
2535
2536 // Stack size, locals size, and code size
2537 if (_major_version == 45 && _minor_version <= 2) {
2538 cfs->guarantee_more(4, CHECK_NULL);
2539 max_stack = cfs->get_u1_fast();
2540 max_locals = cfs->get_u1_fast();
2541 code_length = cfs->get_u2_fast();
2542 } else {
2543 cfs->guarantee_more(8, CHECK_NULL);
2544 max_stack = cfs->get_u2_fast();
2545 max_locals = cfs->get_u2_fast();
2546 code_length = cfs->get_u4_fast();
2547 }
2548 if (_need_verify) {
2549 guarantee_property(args_size <= max_locals,
2550 "Arguments can't fit into locals in class file %s",
2551 CHECK_NULL);
2552 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2553 "Invalid method Code length %u in class file %s",
2554 code_length, CHECK_NULL);
2555 }
2556 // Code pointer
2557 code_start = cfs->current();
2558 assert(code_start != NULL, "null code start");
2559 cfs->guarantee_more(code_length, CHECK_NULL);
2560 cfs->skip_u1_fast(code_length);
2561
2562 // Exception handler table
2563 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2564 exception_table_length = cfs->get_u2_fast();
2565 if (exception_table_length > 0) {
2566 exception_table_start = parse_exception_table(cfs,
2567 code_length,
2568 exception_table_length,
2569 CHECK_NULL);
2570 }
2571
2572 // Parse additional attributes in code attribute
2573 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2574 u2 code_attributes_count = cfs->get_u2_fast();
2575
2576 unsigned int calculated_attribute_length = 0;
2577
2578 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2579 calculated_attribute_length =
2580 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2581 } else {
2582 // max_stack, locals and length are smaller in pre-version 45.2 classes
2583 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2584 }
2585 calculated_attribute_length +=
2586 code_length +
2587 sizeof(exception_table_length) +
2588 sizeof(code_attributes_count) +
2589 exception_table_length *
2590 ( sizeof(u2) + // start_pc
2591 sizeof(u2) + // end_pc
2592 sizeof(u2) + // handler_pc
2593 sizeof(u2) ); // catch_type_index
2594
2595 while (code_attributes_count--) {
2596 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2597 const u2 code_attribute_name_index = cfs->get_u2_fast();
2598 const u4 code_attribute_length = cfs->get_u4_fast();
2599 calculated_attribute_length += code_attribute_length +
2600 sizeof(code_attribute_name_index) +
2601 sizeof(code_attribute_length);
2602 check_property(valid_symbol_at(code_attribute_name_index),
2603 "Invalid code attribute name index %u in class file %s",
2604 code_attribute_name_index,
2605 CHECK_NULL);
2606 if (LoadLineNumberTables &&
2607 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2608 // Parse and compress line number table
2609 parse_linenumber_table(code_attribute_length,
2610 code_length,
2611 &linenumber_table,
2612 CHECK_NULL);
2613
2614 } else if (LoadLocalVariableTables &&
2615 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2616 // Parse local variable table
2617 if (!lvt_allocated) {
2618 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2619 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2620 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2621 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2622 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2623 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2624 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2625 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2626 lvt_allocated = true;
2627 }
2628 if (lvt_cnt == max_lvt_cnt) {
2629 max_lvt_cnt <<= 1;
2630 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2631 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2632 }
2633 localvariable_table_start[lvt_cnt] =
2634 parse_localvariable_table(cfs,
2635 code_length,
2636 max_locals,
2637 code_attribute_length,
2638 &localvariable_table_length[lvt_cnt],
2639 false, // is not LVTT
2640 CHECK_NULL);
2641 total_lvt_length += localvariable_table_length[lvt_cnt];
2642 lvt_cnt++;
2643 } else if (LoadLocalVariableTypeTables &&
2644 _major_version >= JAVA_1_5_VERSION &&
2645 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2646 if (!lvt_allocated) {
2647 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2648 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2649 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2650 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2651 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2652 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2653 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2654 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2655 lvt_allocated = true;
2656 }
2657 // Parse local variable type table
2658 if (lvtt_cnt == max_lvtt_cnt) {
2659 max_lvtt_cnt <<= 1;
2660 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2661 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2662 }
2663 localvariable_type_table_start[lvtt_cnt] =
2664 parse_localvariable_table(cfs,
2665 code_length,
2666 max_locals,
2667 code_attribute_length,
2668 &localvariable_type_table_length[lvtt_cnt],
2669 true, // is LVTT
2670 CHECK_NULL);
2671 lvtt_cnt++;
2672 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2673 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2674 // Stack map is only needed by the new verifier in JDK1.5.
2675 if (parsed_stackmap_attribute) {
2676 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2677 }
2678 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2679 stackmap_data_length = code_attribute_length;
2680 parsed_stackmap_attribute = true;
2681 } else {
2682 // Skip unknown attributes
2683 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2684 }
2685 }
2686 // check method attribute length
2687 if (_need_verify) {
2688 guarantee_property(method_attribute_length == calculated_attribute_length,
2689 "Code segment has wrong length in class file %s",
2690 CHECK_NULL);
2691 }
2692 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2693 // Parse Exceptions attribute
2694 if (parsed_checked_exceptions_attribute) {
2695 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2696 CHECK_NULL);
2697 }
2698 parsed_checked_exceptions_attribute = true;
2699 checked_exceptions_start =
2700 parse_checked_exceptions(cfs,
2701 &checked_exceptions_length,
2702 method_attribute_length,
2703 CHECK_NULL);
2704 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2705 // reject multiple method parameters
2706 if (method_parameters_seen) {
2707 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2708 CHECK_NULL);
2709 }
2710 method_parameters_seen = true;
2711 method_parameters_length = cfs->get_u1_fast();
2712 const u2 real_length = (method_parameters_length * 4u) + 1u;
2713 if (method_attribute_length != real_length) {
2714 classfile_parse_error(
2715 "Invalid MethodParameters method attribute length %u in class file",
2716 method_attribute_length, CHECK_NULL);
2717 }
2718 method_parameters_data = cfs->current();
2719 cfs->skip_u2_fast(method_parameters_length);
2720 cfs->skip_u2_fast(method_parameters_length);
2721 // ignore this attribute if it cannot be reflected
2722 if (!SystemDictionary::Parameter_klass_loaded())
2723 method_parameters_length = -1;
2724 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2725 if (method_attribute_length != 0) {
2726 classfile_parse_error(
2727 "Invalid Synthetic method attribute length %u in class file %s",
2728 method_attribute_length, CHECK_NULL);
2729 }
2730 // Should we check that there hasn't already been a synthetic attribute?
2731 access_flags.set_is_synthetic();
2732 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2733 if (method_attribute_length != 0) {
2734 classfile_parse_error(
2735 "Invalid Deprecated method attribute length %u in class file %s",
2736 method_attribute_length, CHECK_NULL);
2737 }
2738 } else if (_major_version >= JAVA_1_5_VERSION) {
2739 if (method_attribute_name == vmSymbols::tag_signature()) {
2740 if (generic_signature_index != 0) {
2741 classfile_parse_error(
2742 "Multiple Signature attributes for method in class file %s",
2743 CHECK_NULL);
2744 }
2745 if (method_attribute_length != 2) {
2746 classfile_parse_error(
2747 "Invalid Signature attribute length %u in class file %s",
2748 method_attribute_length, CHECK_NULL);
2749 }
2750 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2751 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2752 if (runtime_visible_annotations != NULL) {
2753 classfile_parse_error(
2754 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2755 CHECK_NULL);
2756 }
2757 runtime_visible_annotations_length = method_attribute_length;
2758 runtime_visible_annotations = cfs->current();
2759 assert(runtime_visible_annotations != NULL, "null visible annotations");
2760 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2761 parse_annotations(cp,
2762 runtime_visible_annotations,
2763 runtime_visible_annotations_length,
2764 &parsed_annotations,
2765 _loader_data,
2766 CHECK_NULL);
2767 cfs->skip_u1_fast(runtime_visible_annotations_length);
2768 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2769 if (runtime_invisible_annotations_exists) {
2770 classfile_parse_error(
2771 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2772 CHECK_NULL);
2773 }
2774 runtime_invisible_annotations_exists = true;
2775 if (PreserveAllAnnotations) {
2776 runtime_invisible_annotations_length = method_attribute_length;
2777 runtime_invisible_annotations = cfs->current();
2778 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2779 }
2780 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2781 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2782 if (runtime_visible_parameter_annotations != NULL) {
2783 classfile_parse_error(
2784 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2785 CHECK_NULL);
2786 }
2787 runtime_visible_parameter_annotations_length = method_attribute_length;
2788 runtime_visible_parameter_annotations = cfs->current();
2789 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2790 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2791 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2792 if (runtime_invisible_parameter_annotations_exists) {
2793 classfile_parse_error(
2794 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2795 CHECK_NULL);
2796 }
2797 runtime_invisible_parameter_annotations_exists = true;
2798 if (PreserveAllAnnotations) {
2799 runtime_invisible_parameter_annotations_length = method_attribute_length;
2800 runtime_invisible_parameter_annotations = cfs->current();
2801 assert(runtime_invisible_parameter_annotations != NULL,
2802 "null invisible parameter annotations");
2803 }
2804 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2805 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2806 if (annotation_default != NULL) {
2807 classfile_parse_error(
2808 "Multiple AnnotationDefault attributes for method in class file %s",
2809 CHECK_NULL);
2810 }
2811 annotation_default_length = method_attribute_length;
2812 annotation_default = cfs->current();
2813 assert(annotation_default != NULL, "null annotation default");
2814 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2815 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2816 if (runtime_visible_type_annotations != NULL) {
2817 classfile_parse_error(
2818 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2819 CHECK_NULL);
2820 }
2821 runtime_visible_type_annotations_length = method_attribute_length;
2822 runtime_visible_type_annotations = cfs->current();
2823 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2824 // No need for the VM to parse Type annotations
2825 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2826 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2827 if (runtime_invisible_type_annotations_exists) {
2828 classfile_parse_error(
2829 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2830 CHECK_NULL);
2831 } else {
2832 runtime_invisible_type_annotations_exists = true;
2833 }
2834 if (PreserveAllAnnotations) {
2835 runtime_invisible_type_annotations_length = method_attribute_length;
2836 runtime_invisible_type_annotations = cfs->current();
2837 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2838 }
2839 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2840 } else {
2841 // Skip unknown attributes
2842 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2843 }
2844 } else {
2845 // Skip unknown attributes
2846 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2847 }
2848 }
2849
2850 if (linenumber_table != NULL) {
2851 linenumber_table->write_terminator();
2852 linenumber_table_length = linenumber_table->position();
2853 }
2854
2855 // Make sure there's at least one Code attribute in non-native/non-abstract method
2856 if (_need_verify) {
2857 guarantee_property(access_flags.is_native() ||
2858 access_flags.is_abstract() ||
2859 parsed_code_attribute,
2860 "Absent Code attribute in method that is not native or abstract in class file %s",
2861 CHECK_NULL);
2862 }
2863
2864 // All sizing information for a Method* is finally available, now create it
2865 InlineTableSizes sizes(
2866 total_lvt_length,
2867 linenumber_table_length,
2868 exception_table_length,
2869 checked_exceptions_length,
2870 method_parameters_length,
2871 generic_signature_index,
2872 runtime_visible_annotations_length +
2873 runtime_invisible_annotations_length,
2874 runtime_visible_parameter_annotations_length +
2875 runtime_invisible_parameter_annotations_length,
2876 runtime_visible_type_annotations_length +
2877 runtime_invisible_type_annotations_length,
2878 annotation_default_length,
2879 0);
2880
2881 Method* const m = Method::allocate(_loader_data,
2882 code_length,
2883 access_flags,
2884 &sizes,
2885 ConstMethod::NORMAL,
2886 CHECK_NULL);
2887
2888 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2889
2890 // Fill in information from fixed part (access_flags already set)
2891 m->set_constants(_cp);
2892 m->set_name_index(name_index);
2893 m->set_signature_index(signature_index);
2894
2895 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2896 m->constMethod()->set_result_type(rtf.type());
2897
2898 if (args_size >= 0) {
2899 m->set_size_of_parameters(args_size);
2900 } else {
2901 m->compute_size_of_parameters(THREAD);
2902 }
2903 #ifdef ASSERT
2904 if (args_size >= 0) {
2905 m->compute_size_of_parameters(THREAD);
2906 assert(args_size == m->size_of_parameters(), "");
2907 }
2908 #endif
2909
2910 // Fill in code attribute information
2911 m->set_max_stack(max_stack);
2912 m->set_max_locals(max_locals);
2913 if (stackmap_data != NULL) {
2914 m->constMethod()->copy_stackmap_data(_loader_data,
2915 (u1*)stackmap_data,
2916 stackmap_data_length,
2917 CHECK_NULL);
2918 }
2919
2920 // Copy byte codes
2921 m->set_code((u1*)code_start);
2922
2923 // Copy line number table
2924 if (linenumber_table != NULL) {
2925 memcpy(m->compressed_linenumber_table(),
2926 linenumber_table->buffer(),
2927 linenumber_table_length);
2928 }
2929
2930 // Copy exception table
2931 if (exception_table_length > 0) {
2932 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2933 m->exception_table_start(),
2934 exception_table_length * sizeof(ExceptionTableElement),
2935 sizeof(u2));
2936 }
2937
2938 // Copy method parameters
2939 if (method_parameters_length > 0) {
2940 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2941 for (int i = 0; i < method_parameters_length; i++) {
2942 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2943 method_parameters_data += 2;
2944 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2945 method_parameters_data += 2;
2946 }
2947 }
2948
2949 // Copy checked exceptions
2950 if (checked_exceptions_length > 0) {
2951 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2952 m->checked_exceptions_start(),
2953 checked_exceptions_length * sizeof(CheckedExceptionElement),
2954 sizeof(u2));
2955 }
2956
2957 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2958 if (total_lvt_length > 0) {
2959 promoted_flags->set_has_localvariable_table();
2960 copy_localvariable_table(m->constMethod(),
2961 lvt_cnt,
2962 localvariable_table_length,
2963 localvariable_table_start,
2964 lvtt_cnt,
2965 localvariable_type_table_length,
2966 localvariable_type_table_start,
2967 CHECK_NULL);
2968 }
2969
2970 if (parsed_annotations.has_any_annotations())
2971 parsed_annotations.apply_to(m);
2972
2973 // Copy annotations
2974 copy_method_annotations(m->constMethod(),
2975 runtime_visible_annotations,
2976 runtime_visible_annotations_length,
2977 runtime_invisible_annotations,
2978 runtime_invisible_annotations_length,
2979 runtime_visible_parameter_annotations,
2980 runtime_visible_parameter_annotations_length,
2981 runtime_invisible_parameter_annotations,
2982 runtime_invisible_parameter_annotations_length,
2983 runtime_visible_type_annotations,
2984 runtime_visible_type_annotations_length,
2985 runtime_invisible_type_annotations,
2986 runtime_invisible_type_annotations_length,
2987 annotation_default,
2988 annotation_default_length,
2989 CHECK_NULL);
2990
2991 if (name == vmSymbols::finalize_method_name() &&
2992 signature == vmSymbols::void_method_signature()) {
2993 if (m->is_empty_method()) {
2994 _has_empty_finalizer = true;
2995 } else {
2996 _has_finalizer = true;
2997 }
2998 }
2999 if (name == vmSymbols::object_initializer_name() &&
3000 signature == vmSymbols::void_method_signature() &&
3001 m->is_vanilla_constructor()) {
3002 _has_vanilla_constructor = true;
3003 }
3004
3005 NOT_PRODUCT(m->verify());
3006 return m;
3007 }
3008
3009
3010 // The promoted_flags parameter is used to pass relevant access_flags
3011 // from the methods back up to the containing klass. These flag values
3012 // are added to klass's access_flags.
3013 // Side-effects: populates the _methods field in the parser
3014 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3015 bool is_interface,
3016 bool is_value_type,
3017 AccessFlags* promoted_flags,
3018 bool* has_final_method,
3019 bool* declares_nonstatic_concrete_methods,
3020 TRAPS) {
3021 assert(cfs != NULL, "invariant");
3022 assert(promoted_flags != NULL, "invariant");
3023 assert(has_final_method != NULL, "invariant");
3024 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3025
3026 assert(NULL == _methods, "invariant");
3027
3028 cfs->guarantee_more(2, CHECK); // length
3029 const u2 length = cfs->get_u2_fast();
3030 if (length == 0) {
3031 _methods = Universe::the_empty_method_array();
3032 } else {
3033 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3034 length,
3035 NULL,
3036 CHECK);
3037
3038 for (int index = 0; index < length; index++) {
3039 Method* method = parse_method(cfs,
3040 is_interface,
3041 is_value_type,
3042 _cp,
3043 promoted_flags,
3044 CHECK);
3045
3046 if (method->is_final()) {
3047 *has_final_method = true;
3048 }
3049 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3050 // used for interface initialization, and default method inheritance analysis
3051 if (is_interface && !(*declares_nonstatic_concrete_methods)
3052 && !method->is_abstract() && !method->is_static()) {
3053 *declares_nonstatic_concrete_methods = true;
3054 }
3055 _methods->at_put(index, method);
3056 }
3057
3058 if (_need_verify && length > 1) {
3059 // Check duplicated methods
3060 ResourceMark rm(THREAD);
3061 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3062 THREAD, NameSigHash*, HASH_ROW_SIZE);
3063 initialize_hashtable(names_and_sigs);
3064 bool dup = false;
3065 const Symbol* name = NULL;
3066 const Symbol* sig = NULL;
3067 {
3068 debug_only(NoSafepointVerifier nsv;)
3069 for (int i = 0; i < length; i++) {
3070 const Method* const m = _methods->at(i);
3071 name = m->name();
3072 sig = m->signature();
3073 // If no duplicates, add name/signature in hashtable names_and_sigs.
3074 if (!put_after_lookup(name, sig, names_and_sigs)) {
3075 dup = true;
3076 break;
3077 }
3078 }
3079 }
3080 if (dup) {
3081 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3082 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3083 }
3084 }
3085 }
3086 }
3087
3088 static const intArray* sort_methods(Array<Method*>* methods) {
3089 const int length = methods->length();
3090 // If JVMTI original method ordering or sharing is enabled we have to
3091 // remember the original class file ordering.
3092 // We temporarily use the vtable_index field in the Method* to store the
3093 // class file index, so we can read in after calling qsort.
3094 // Put the method ordering in the shared archive.
3095 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3096 for (int index = 0; index < length; index++) {
3097 Method* const m = methods->at(index);
3098 assert(!m->valid_vtable_index(), "vtable index should not be set");
3099 m->set_vtable_index(index);
3100 }
3101 }
3102 // Sort method array by ascending method name (for faster lookups & vtable construction)
3103 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3104 Method::sort_methods(methods);
3105
3106 intArray* method_ordering = NULL;
3107 // If JVMTI original method ordering or sharing is enabled construct int
3108 // array remembering the original ordering
3109 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3110 method_ordering = new intArray(length, length, -1);
3111 for (int index = 0; index < length; index++) {
3112 Method* const m = methods->at(index);
3113 const int old_index = m->vtable_index();
3114 assert(old_index >= 0 && old_index < length, "invalid method index");
3115 method_ordering->at_put(index, old_index);
3116 m->set_vtable_index(Method::invalid_vtable_index);
3117 }
3118 }
3119 return method_ordering;
3120 }
3121
3122 // Parse generic_signature attribute for methods and fields
3123 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3124 TRAPS) {
3125 assert(cfs != NULL, "invariant");
3126
3127 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3128 const u2 generic_signature_index = cfs->get_u2_fast();
3129 check_property(
3130 valid_symbol_at(generic_signature_index),
3131 "Invalid Signature attribute at constant pool index %u in class file %s",
3132 generic_signature_index, CHECK_0);
3133 return generic_signature_index;
3134 }
3135
3136 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3137 TRAPS) {
3138
3139 assert(cfs != NULL, "invariant");
3140
3141 cfs->guarantee_more(2, CHECK); // sourcefile_index
3142 const u2 sourcefile_index = cfs->get_u2_fast();
3143 check_property(
3144 valid_symbol_at(sourcefile_index),
3145 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3146 sourcefile_index, CHECK);
3147 set_class_sourcefile_index(sourcefile_index);
3148 }
3149
3150 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3151 int length,
3152 TRAPS) {
3153 assert(cfs != NULL, "invariant");
3154
3155 const u1* const sde_buffer = cfs->current();
3156 assert(sde_buffer != NULL, "null sde buffer");
3157
3158 // Don't bother storing it if there is no way to retrieve it
3159 if (JvmtiExport::can_get_source_debug_extension()) {
3160 assert((length+1) > length, "Overflow checking");
3161 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3162 for (int i = 0; i < length; i++) {
3163 sde[i] = sde_buffer[i];
3164 }
3165 sde[length] = '\0';
3166 set_class_sde_buffer((const char*)sde, length);
3167 }
3168 // Got utf8 string, set stream position forward
3169 cfs->skip_u1(length, CHECK);
3170 }
3171
3172
3173 // Inner classes can be static, private or protected (classic VM does this)
3174 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3175 JVM_ACC_PRIVATE | \
3176 JVM_ACC_PROTECTED | \
3177 JVM_ACC_STATIC \
3178 )
3179
3180 u2 ClassFileParser::parse_value_types_attribute(const ClassFileStream* const cfs,
3181 const u1* const value_types_attribute_start,
3182 TRAPS) {
3183 const u1* const current_mark = cfs->current();
3184 u2 length = 0;
3185 if (value_types_attribute_start != NULL) {
3186 cfs->set_current(value_types_attribute_start);
3187 cfs->guarantee_more(2, CHECK_0); // length
3188 length = cfs->get_u2_fast();
3189 }
3190 Array<ValueTypes>* const value_types = MetadataFactory::new_array<ValueTypes>(_loader_data, length, CHECK_0);
3191
3192 int index = 0;
3193 const int cp_size = _cp->length();
3194 cfs->guarantee_more(2 *length, CHECK_0);
3195 for (int n = 0; n < length; n++) {
3196 // Value types class index
3197 const u2 value_types_info_index = cfs->get_u2_fast();
3198 check_property(
3199 valid_klass_reference_at(value_types_info_index),
3200 "value_types_info_index %u has bad constant type in class file %s",
3201 value_types_info_index, CHECK_0);
3202 ValueTypes vt;
3203 vt._class_info_index = value_types_info_index;
3204 vt._class_name = NULL;
3205 value_types->at_put(index++, vt);
3206 }
3207 _value_types = value_types;
3208 // Restore buffer's current position.
3209 cfs->set_current(current_mark);
3210
3211 return length;
3212 }
3213
3214 // Return number of classes in the inner classes attribute table
3215 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3216 const u1* const inner_classes_attribute_start,
3217 bool parsed_enclosingmethod_attribute,
3218 u2 enclosing_method_class_index,
3219 u2 enclosing_method_method_index,
3220 TRAPS) {
3221 const u1* const current_mark = cfs->current();
3222 u2 length = 0;
3223 if (inner_classes_attribute_start != NULL) {
3224 cfs->set_current(inner_classes_attribute_start);
3225 cfs->guarantee_more(2, CHECK_0); // length
3226 length = cfs->get_u2_fast();
3227 }
3228
3229 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3230 // method data:
3231 // [inner_class_info_index,
3232 // outer_class_info_index,
3233 // inner_name_index,
3234 // inner_class_access_flags,
3235 // ...
3236 // enclosing_method_class_index,
3237 // enclosing_method_method_index]
3238 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3239 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3240 _inner_classes = inner_classes;
3241
3242 int index = 0;
3243 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3244 for (int n = 0; n < length; n++) {
3245 // Inner class index
3246 const u2 inner_class_info_index = cfs->get_u2_fast();
3247 check_property(
3248 valid_klass_reference_at(inner_class_info_index),
3249 "inner_class_info_index %u has bad constant type in class file %s",
3250 inner_class_info_index, CHECK_0);
3251 // Outer class index
3252 const u2 outer_class_info_index = cfs->get_u2_fast();
3253 check_property(
3254 outer_class_info_index == 0 ||
3255 valid_klass_reference_at(outer_class_info_index),
3256 "outer_class_info_index %u has bad constant type in class file %s",
3257 outer_class_info_index, CHECK_0);
3258 // Inner class name
3259 const u2 inner_name_index = cfs->get_u2_fast();
3260 check_property(
3261 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3262 "inner_name_index %u has bad constant type in class file %s",
3263 inner_name_index, CHECK_0);
3264 if (_need_verify) {
3265 guarantee_property(inner_class_info_index != outer_class_info_index,
3266 "Class is both outer and inner class in class file %s", CHECK_0);
3267 }
3268
3269 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3270 // JVM_ACC_MODULE is defined in JDK-9 and later.
3271 if (_major_version >= JAVA_9_VERSION) {
3272 recognized_modifiers |= JVM_ACC_MODULE;
3273 }
3274 // JVM_ACC_VALUE is defined for class file version 55 and later
3275 if (supports_value_types()) {
3276 recognized_modifiers |= JVM_ACC_VALUE;
3277 }
3278
3279 // Access flags
3280 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3281
3282 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3283 // Set abstract bit for old class files for backward compatibility
3284 flags |= JVM_ACC_ABSTRACT;
3285 }
3286 verify_legal_class_modifiers(flags, CHECK_0);
3287 AccessFlags inner_access_flags(flags);
3288
3289 inner_classes->at_put(index++, inner_class_info_index);
3290 inner_classes->at_put(index++, outer_class_info_index);
3291 inner_classes->at_put(index++, inner_name_index);
3292 inner_classes->at_put(index++, inner_access_flags.as_short());
3293 }
3294
3295 // 4347400: make sure there's no duplicate entry in the classes array
3296 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3297 for(int i = 0; i < length * 4; i += 4) {
3298 for(int j = i + 4; j < length * 4; j += 4) {
3299 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3300 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3301 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3302 inner_classes->at(i+3) != inner_classes->at(j+3)),
3303 "Duplicate entry in InnerClasses in class file %s",
3304 CHECK_0);
3305 }
3306 }
3307 }
3308
3309 // Set EnclosingMethod class and method indexes.
3310 if (parsed_enclosingmethod_attribute) {
3311 inner_classes->at_put(index++, enclosing_method_class_index);
3312 inner_classes->at_put(index++, enclosing_method_method_index);
3313 }
3314 assert(index == size, "wrong size");
3315
3316 // Restore buffer's current position.
3317 cfs->set_current(current_mark);
3318
3319 return length;
3320 }
3321
3322 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3323 const u1* const nest_members_attribute_start,
3324 TRAPS) {
3325 const u1* const current_mark = cfs->current();
3326 u2 length = 0;
3327 if (nest_members_attribute_start != NULL) {
3328 cfs->set_current(nest_members_attribute_start);
3329 cfs->guarantee_more(2, CHECK_0); // length
3330 length = cfs->get_u2_fast();
3331 }
3332 const int size = length;
3333 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3334 _nest_members = nest_members;
3335
3336 int index = 0;
3337 cfs->guarantee_more(2 * length, CHECK_0);
3338 for (int n = 0; n < length; n++) {
3339 const u2 class_info_index = cfs->get_u2_fast();
3340 check_property(
3341 valid_klass_reference_at(class_info_index),
3342 "Nest member class_info_index %u has bad constant type in class file %s",
3343 class_info_index, CHECK_0);
3344 nest_members->at_put(index++, class_info_index);
3345 }
3346 assert(index == size, "wrong size");
3347
3348 // Restore buffer's current position.
3349 cfs->set_current(current_mark);
3350
3351 return length;
3352 }
3353
3354 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3355 set_class_synthetic_flag(true);
3356 }
3357
3358 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3359 assert(cfs != NULL, "invariant");
3360
3361 const u2 signature_index = cfs->get_u2(CHECK);
3362 check_property(
3363 valid_symbol_at(signature_index),
3364 "Invalid constant pool index %u in Signature attribute in class file %s",
3365 signature_index, CHECK);
3366 set_class_generic_signature_index(signature_index);
3367 }
3368
3369 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3370 ConstantPool* cp,
3371 u4 attribute_byte_length,
3372 TRAPS) {
3373 assert(cfs != NULL, "invariant");
3374 assert(cp != NULL, "invariant");
3375
3376 const u1* const current_start = cfs->current();
3377
3378 guarantee_property(attribute_byte_length >= sizeof(u2),
3379 "Invalid BootstrapMethods attribute length %u in class file %s",
3380 attribute_byte_length,
3381 CHECK);
3382
3383 cfs->guarantee_more(attribute_byte_length, CHECK);
3384
3385 const int attribute_array_length = cfs->get_u2_fast();
3386
3387 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3388 "Short length on BootstrapMethods in class file %s",
3389 CHECK);
3390
3391
3392 // The attribute contains a counted array of counted tuples of shorts,
3393 // represending bootstrap specifiers:
3394 // length*{bootstrap_method_index, argument_count*{argument_index}}
3395 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3396 // operand_count = number of shorts in attr, except for leading length
3397
3398 // The attribute is copied into a short[] array.
3399 // The array begins with a series of short[2] pairs, one for each tuple.
3400 const int index_size = (attribute_array_length * 2);
3401
3402 Array<u2>* const operands =
3403 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3404
3405 // Eagerly assign operands so they will be deallocated with the constant
3406 // pool if there is an error.
3407 cp->set_operands(operands);
3408
3409 int operand_fill_index = index_size;
3410 const int cp_size = cp->length();
3411
3412 for (int n = 0; n < attribute_array_length; n++) {
3413 // Store a 32-bit offset into the header of the operand array.
3414 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3415
3416 // Read a bootstrap specifier.
3417 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3418 const u2 bootstrap_method_index = cfs->get_u2_fast();
3419 const u2 argument_count = cfs->get_u2_fast();
3420 check_property(
3421 valid_cp_range(bootstrap_method_index, cp_size) &&
3422 cp->tag_at(bootstrap_method_index).is_method_handle(),
3423 "bootstrap_method_index %u has bad constant type in class file %s",
3424 bootstrap_method_index,
3425 CHECK);
3426
3427 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3428 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3429 CHECK);
3430
3431 operands->at_put(operand_fill_index++, bootstrap_method_index);
3432 operands->at_put(operand_fill_index++, argument_count);
3433
3434 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3435 for (int j = 0; j < argument_count; j++) {
3436 const u2 argument_index = cfs->get_u2_fast();
3437 check_property(
3438 valid_cp_range(argument_index, cp_size) &&
3439 cp->tag_at(argument_index).is_loadable_constant(),
3440 "argument_index %u has bad constant type in class file %s",
3441 argument_index,
3442 CHECK);
3443 operands->at_put(operand_fill_index++, argument_index);
3444 }
3445 }
3446 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3447 "Bad length on BootstrapMethods in class file %s",
3448 CHECK);
3449 }
3450
3451 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3452 ConstantPool* cp,
3453 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3454 TRAPS) {
3455 assert(cfs != NULL, "invariant");
3456 assert(cp != NULL, "invariant");
3457 assert(parsed_annotations != NULL, "invariant");
3458
3459 // Set inner classes attribute to default sentinel
3460 _inner_classes = Universe::the_empty_short_array();
3461 // Set nest members attribute to default sentinel
3462 _nest_members = Universe::the_empty_short_array();
3463 cfs->guarantee_more(2, CHECK); // attributes_count
3464 u2 attributes_count = cfs->get_u2_fast();
3465 bool parsed_sourcefile_attribute = false;
3466 bool parsed_innerclasses_attribute = false;
3467 bool parsed_nest_members_attribute = false;
3468 bool parsed_nest_host_attribute = false;
3469 bool parsed_value_types_attribute = false;
3470 bool parsed_enclosingmethod_attribute = false;
3471 bool parsed_bootstrap_methods_attribute = false;
3472 const u1* runtime_visible_annotations = NULL;
3473 int runtime_visible_annotations_length = 0;
3474 const u1* runtime_invisible_annotations = NULL;
3475 int runtime_invisible_annotations_length = 0;
3476 const u1* runtime_visible_type_annotations = NULL;
3477 int runtime_visible_type_annotations_length = 0;
3478 const u1* runtime_invisible_type_annotations = NULL;
3479 int runtime_invisible_type_annotations_length = 0;
3480 bool runtime_invisible_type_annotations_exists = false;
3481 bool runtime_invisible_annotations_exists = false;
3482 bool parsed_source_debug_ext_annotations_exist = false;
3483 const u1* inner_classes_attribute_start = NULL;
3484 u4 inner_classes_attribute_length = 0;
3485 const u1* value_types_attribute_start = NULL;
3486 u4 value_types_attribute_length = 0;
3487 u2 enclosing_method_class_index = 0;
3488 u2 enclosing_method_method_index = 0;
3489 const u1* nest_members_attribute_start = NULL;
3490 u4 nest_members_attribute_length = 0;
3491
3492 // Iterate over attributes
3493 while (attributes_count--) {
3494 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3495 const u2 attribute_name_index = cfs->get_u2_fast();
3496 const u4 attribute_length = cfs->get_u4_fast();
3497 check_property(
3498 valid_symbol_at(attribute_name_index),
3499 "Attribute name has bad constant pool index %u in class file %s",
3500 attribute_name_index, CHECK);
3501 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3502 if (tag == vmSymbols::tag_source_file()) {
3503 // Check for SourceFile tag
3504 if (_need_verify) {
3505 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3506 }
3507 if (parsed_sourcefile_attribute) {
3508 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3509 } else {
3510 parsed_sourcefile_attribute = true;
3511 }
3512 parse_classfile_sourcefile_attribute(cfs, CHECK);
3513 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3514 // Check for SourceDebugExtension tag
3515 if (parsed_source_debug_ext_annotations_exist) {
3516 classfile_parse_error(
3517 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3518 }
3519 parsed_source_debug_ext_annotations_exist = true;
3520 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3521 } else if (tag == vmSymbols::tag_inner_classes()) {
3522 // Check for InnerClasses tag
3523 if (parsed_innerclasses_attribute) {
3524 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3525 } else {
3526 parsed_innerclasses_attribute = true;
3527 }
3528 inner_classes_attribute_start = cfs->current();
3529 inner_classes_attribute_length = attribute_length;
3530 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3531 } else if (tag == vmSymbols::tag_value_types()) {
3532 // Check for ValueTypes tag
3533 if (parsed_value_types_attribute) {
3534 classfile_parse_error("Multiple ValueTypes attributes in class file %s", CHECK);
3535 } else {
3536 parsed_value_types_attribute = true;
3537 }
3538 value_types_attribute_start = cfs->current();
3539 value_types_attribute_length = attribute_length;
3540 cfs->skip_u1(value_types_attribute_length, CHECK);
3541 } else if (tag == vmSymbols::tag_synthetic()) {
3542 // Check for Synthetic tag
3543 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3544 if (attribute_length != 0) {
3545 classfile_parse_error(
3546 "Invalid Synthetic classfile attribute length %u in class file %s",
3547 attribute_length, CHECK);
3548 }
3549 parse_classfile_synthetic_attribute(CHECK);
3550 } else if (tag == vmSymbols::tag_deprecated()) {
3551 // Check for Deprecatd tag - 4276120
3552 if (attribute_length != 0) {
3553 classfile_parse_error(
3554 "Invalid Deprecated classfile attribute length %u in class file %s",
3555 attribute_length, CHECK);
3556 }
3557 } else if (_major_version >= JAVA_1_5_VERSION) {
3558 if (tag == vmSymbols::tag_signature()) {
3559 if (_generic_signature_index != 0) {
3560 classfile_parse_error(
3561 "Multiple Signature attributes in class file %s", CHECK);
3562 }
3563 if (attribute_length != 2) {
3564 classfile_parse_error(
3565 "Wrong Signature attribute length %u in class file %s",
3566 attribute_length, CHECK);
3567 }
3568 parse_classfile_signature_attribute(cfs, CHECK);
3569 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3570 if (runtime_visible_annotations != NULL) {
3571 classfile_parse_error(
3572 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3573 }
3574 runtime_visible_annotations_length = attribute_length;
3575 runtime_visible_annotations = cfs->current();
3576 assert(runtime_visible_annotations != NULL, "null visible annotations");
3577 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3578 parse_annotations(cp,
3579 runtime_visible_annotations,
3580 runtime_visible_annotations_length,
3581 parsed_annotations,
3582 _loader_data,
3583 CHECK);
3584 cfs->skip_u1_fast(runtime_visible_annotations_length);
3585 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3586 if (runtime_invisible_annotations_exists) {
3587 classfile_parse_error(
3588 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3589 }
3590 runtime_invisible_annotations_exists = true;
3591 if (PreserveAllAnnotations) {
3592 runtime_invisible_annotations_length = attribute_length;
3593 runtime_invisible_annotations = cfs->current();
3594 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3595 }
3596 cfs->skip_u1(attribute_length, CHECK);
3597 } else if (tag == vmSymbols::tag_enclosing_method()) {
3598 if (parsed_enclosingmethod_attribute) {
3599 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3600 } else {
3601 parsed_enclosingmethod_attribute = true;
3602 }
3603 guarantee_property(attribute_length == 4,
3604 "Wrong EnclosingMethod attribute length %u in class file %s",
3605 attribute_length, CHECK);
3606 cfs->guarantee_more(4, CHECK); // class_index, method_index
3607 enclosing_method_class_index = cfs->get_u2_fast();
3608 enclosing_method_method_index = cfs->get_u2_fast();
3609 if (enclosing_method_class_index == 0) {
3610 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3611 }
3612 // Validate the constant pool indices and types
3613 check_property(valid_klass_reference_at(enclosing_method_class_index),
3614 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3615 if (enclosing_method_method_index != 0 &&
3616 (!cp->is_within_bounds(enclosing_method_method_index) ||
3617 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3618 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3619 }
3620 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3621 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3622 if (parsed_bootstrap_methods_attribute) {
3623 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3624 }
3625 parsed_bootstrap_methods_attribute = true;
3626 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3627 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3628 if (runtime_visible_type_annotations != NULL) {
3629 classfile_parse_error(
3630 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3631 }
3632 runtime_visible_type_annotations_length = attribute_length;
3633 runtime_visible_type_annotations = cfs->current();
3634 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3635 // No need for the VM to parse Type annotations
3636 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3637 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3638 if (runtime_invisible_type_annotations_exists) {
3639 classfile_parse_error(
3640 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3641 } else {
3642 runtime_invisible_type_annotations_exists = true;
3643 }
3644 if (PreserveAllAnnotations) {
3645 runtime_invisible_type_annotations_length = attribute_length;
3646 runtime_invisible_type_annotations = cfs->current();
3647 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3648 }
3649 cfs->skip_u1(attribute_length, CHECK);
3650 } else if (_major_version >= JAVA_11_VERSION) {
3651 if (tag == vmSymbols::tag_nest_members()) {
3652 // Check for NestMembers tag
3653 if (parsed_nest_members_attribute) {
3654 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3655 } else {
3656 parsed_nest_members_attribute = true;
3657 }
3658 if (parsed_nest_host_attribute) {
3659 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3660 }
3661 nest_members_attribute_start = cfs->current();
3662 nest_members_attribute_length = attribute_length;
3663 cfs->skip_u1(nest_members_attribute_length, CHECK);
3664 } else if (tag == vmSymbols::tag_nest_host()) {
3665 if (parsed_nest_host_attribute) {
3666 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3667 } else {
3668 parsed_nest_host_attribute = true;
3669 }
3670 if (parsed_nest_members_attribute) {
3671 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3672 }
3673 if (_need_verify) {
3674 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3675 }
3676 cfs->guarantee_more(2, CHECK);
3677 u2 class_info_index = cfs->get_u2_fast();
3678 check_property(
3679 valid_klass_reference_at(class_info_index),
3680 "Nest-host class_info_index %u has bad constant type in class file %s",
3681 class_info_index, CHECK);
3682 _nest_host = class_info_index;
3683 } else {
3684 // Unknown attribute
3685 cfs->skip_u1(attribute_length, CHECK);
3686 }
3687 } else {
3688 // Unknown attribute
3689 cfs->skip_u1(attribute_length, CHECK);
3690 }
3691 } else {
3692 // Unknown attribute
3693 cfs->skip_u1(attribute_length, CHECK);
3694 }
3695 }
3696 _annotations = assemble_annotations(runtime_visible_annotations,
3697 runtime_visible_annotations_length,
3698 runtime_invisible_annotations,
3699 runtime_invisible_annotations_length,
3700 CHECK);
3701 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3702 runtime_visible_type_annotations_length,
3703 runtime_invisible_type_annotations,
3704 runtime_invisible_type_annotations_length,
3705 CHECK);
3706
3707 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3708 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3709 cfs,
3710 inner_classes_attribute_start,
3711 parsed_innerclasses_attribute,
3712 enclosing_method_class_index,
3713 enclosing_method_method_index,
3714 CHECK);
3715 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3716 guarantee_property(
3717 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3718 "Wrong InnerClasses attribute length in class file %s", CHECK);
3719 }
3720 }
3721
3722 if (parsed_nest_members_attribute) {
3723 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3724 cfs,
3725 nest_members_attribute_start,
3726 CHECK);
3727 if (_need_verify) {
3728 guarantee_property(
3729 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3730 "Wrong NestMembers attribute length in class file %s", CHECK);
3731 }
3732 }
3733
3734 if (parsed_value_types_attribute) {
3735 parse_value_types_attribute(cfs, value_types_attribute_start, CHECK);
3736 }
3737
3738 if (_max_bootstrap_specifier_index >= 0) {
3739 guarantee_property(parsed_bootstrap_methods_attribute,
3740 "Missing BootstrapMethods attribute in class file %s", CHECK);
3741 }
3742 }
3743
3744 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3745 assert(k != NULL, "invariant");
3746
3747 if (_synthetic_flag)
3748 k->set_is_synthetic();
3749 if (_sourcefile_index != 0) {
3750 k->set_source_file_name_index(_sourcefile_index);
3751 }
3752 if (_generic_signature_index != 0) {
3753 k->set_generic_signature_index(_generic_signature_index);
3754 }
3755 if (_sde_buffer != NULL) {
3756 k->set_source_debug_extension(_sde_buffer, _sde_length);
3757 }
3758 }
3759
3760 // Create the Annotations object that will
3761 // hold the annotations array for the Klass.
3762 void ClassFileParser::create_combined_annotations(TRAPS) {
3763 if (_annotations == NULL &&
3764 _type_annotations == NULL &&
3765 _fields_annotations == NULL &&
3766 _fields_type_annotations == NULL) {
3767 // Don't create the Annotations object unnecessarily.
3768 return;
3769 }
3770
3771 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3772 annotations->set_class_annotations(_annotations);
3773 annotations->set_class_type_annotations(_type_annotations);
3774 annotations->set_fields_annotations(_fields_annotations);
3775 annotations->set_fields_type_annotations(_fields_type_annotations);
3776
3777 // This is the Annotations object that will be
3778 // assigned to InstanceKlass being constructed.
3779 _combined_annotations = annotations;
3780
3781 // The annotations arrays below has been transfered the
3782 // _combined_annotations so these fields can now be cleared.
3783 _annotations = NULL;
3784 _type_annotations = NULL;
3785 _fields_annotations = NULL;
3786 _fields_type_annotations = NULL;
3787 }
3788
3789 // Transfer ownership of metadata allocated to the InstanceKlass.
3790 void ClassFileParser::apply_parsed_class_metadata(
3791 InstanceKlass* this_klass,
3792 int java_fields_count, TRAPS) {
3793 assert(this_klass != NULL, "invariant");
3794
3795 _cp->set_pool_holder(this_klass);
3796 this_klass->set_constants(_cp);
3797 this_klass->set_fields(_fields, java_fields_count);
3798 this_klass->set_methods(_methods);
3799 this_klass->set_inner_classes(_inner_classes);
3800 this_klass->set_nest_members(_nest_members);
3801 this_klass->set_nest_host_index(_nest_host);
3802 this_klass->set_value_types(_value_types);
3803 this_klass->set_local_interfaces(_local_interfaces);
3804 this_klass->set_annotations(_combined_annotations);
3805 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3806 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3807 // its _super. If an OOM occurs while loading the current klass, its _super field
3808 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3809 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3810 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3811
3812 // Clear out these fields so they don't get deallocated by the destructor
3813 clear_class_metadata();
3814 }
3815
3816 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3817 int runtime_visible_annotations_length,
3818 const u1* const runtime_invisible_annotations,
3819 int runtime_invisible_annotations_length,
3820 TRAPS) {
3821 AnnotationArray* annotations = NULL;
3822 if (runtime_visible_annotations != NULL ||
3823 runtime_invisible_annotations != NULL) {
3824 annotations = MetadataFactory::new_array<u1>(_loader_data,
3825 runtime_visible_annotations_length +
3826 runtime_invisible_annotations_length,
3827 CHECK_(annotations));
3828 if (runtime_visible_annotations != NULL) {
3829 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3830 annotations->at_put(i, runtime_visible_annotations[i]);
3831 }
3832 }
3833 if (runtime_invisible_annotations != NULL) {
3834 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3835 int append = runtime_visible_annotations_length+i;
3836 annotations->at_put(append, runtime_invisible_annotations[i]);
3837 }
3838 }
3839 }
3840 return annotations;
3841 }
3842
3843 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3844 const int super_class_index,
3845 const bool need_verify,
3846 TRAPS) {
3847 assert(cp != NULL, "invariant");
3848 const InstanceKlass* super_klass = NULL;
3849
3850 if (super_class_index == 0) {
3851 check_property(_class_name == vmSymbols::java_lang_Object()
3852 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3853 "Invalid superclass index %u in class file %s",
3854 super_class_index,
3855 CHECK_NULL);
3856 } else {
3857 check_property(valid_klass_reference_at(super_class_index),
3858 "Invalid superclass index %u in class file %s",
3859 super_class_index,
3860 CHECK_NULL);
3861 // The class name should be legal because it is checked when parsing constant pool.
3862 // However, make sure it is not an array type.
3863 bool is_array = false;
3864 if (cp->tag_at(super_class_index).is_klass()) {
3865 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3866 if (need_verify)
3867 is_array = super_klass->is_array_klass();
3868 } else if (need_verify) {
3869 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3870 }
3871 if (need_verify) {
3872 guarantee_property(!is_array,
3873 "Bad superclass name in class file %s", CHECK_NULL);
3874 }
3875 }
3876 return super_klass;
3877 }
3878
3879 #ifndef PRODUCT
3880 static void print_field_layout(const Symbol* name,
3881 Array<u2>* fields,
3882 const constantPoolHandle& cp,
3883 int instance_size,
3884 int instance_fields_start,
3885 int instance_fields_end,
3886 int static_fields_end) {
3887
3888 assert(name != NULL, "invariant");
3889
3890 tty->print("%s: field layout\n", name->as_klass_external_name());
3891 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3892 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3893 if (!fs.access_flags().is_static()) {
3894 tty->print(" @%3d \"%s\" %s\n",
3895 fs.offset(),
3896 fs.name()->as_klass_external_name(),
3897 fs.signature()->as_klass_external_name());
3898 }
3899 }
3900 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3901 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3902 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3903 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3904 if (fs.access_flags().is_static()) {
3905 tty->print(" @%3d \"%s\" %s\n",
3906 fs.offset(),
3907 fs.name()->as_klass_external_name(),
3908 fs.signature()->as_klass_external_name());
3909 }
3910 }
3911 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3912 tty->print("\n");
3913 }
3914 #endif
3915
3916 // Values needed for oopmap and InstanceKlass creation
3917 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3918 public:
3919 OopMapBlocksBuilder* oop_map_blocks;
3920 int instance_size;
3921 int nonstatic_field_size;
3922 int static_field_size;
3923 bool has_nonstatic_fields;
3924 };
3925
3926 // Utility to collect and compact oop maps during layout
3927 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3928 public:
3929 OopMapBlock* nonstatic_oop_maps;
3930 unsigned int nonstatic_oop_map_count;
3931 unsigned int max_nonstatic_oop_maps;
3932
3933 public:
3934 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3935 max_nonstatic_oop_maps = max_blocks;
3936 nonstatic_oop_map_count = 0;
3937 if (max_blocks == 0) {
3938 nonstatic_oop_maps = NULL;
3939 } else {
3940 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3941 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3942 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3943 }
3944 }
3945
3946 OopMapBlock* last_oop_map() const {
3947 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3948 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3949 }
3950
3951 // addition of super oop maps
3952 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3953 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3954 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3955
3956 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3957 nonstatic_oop_map_count += nof_blocks;
3958 }
3959
3960 // collection of oops
3961 void add(int offset, int count) {
3962 if (nonstatic_oop_map_count == 0) {
3963 nonstatic_oop_map_count++;
3964 }
3965 OopMapBlock* nonstatic_oop_map = last_oop_map();
3966 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3967 nonstatic_oop_map->set_offset(offset);
3968 nonstatic_oop_map->set_count(count);
3969 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3970 nonstatic_oop_map->increment_count(count);
3971 } else { // Need a new one...
3972 nonstatic_oop_map_count++;
3973 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3974 nonstatic_oop_map = last_oop_map();
3975 nonstatic_oop_map->set_offset(offset);
3976 nonstatic_oop_map->set_count(count);
3977 }
3978 }
3979
3980 // general purpose copy, e.g. into allocated instanceKlass
3981 void copy(OopMapBlock* dst) {
3982 if (nonstatic_oop_map_count != 0) {
3983 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3984 }
3985 }
3986
3987 // Sort and compact adjacent blocks
3988 void compact(TRAPS) {
3989 if (nonstatic_oop_map_count <= 1) {
3990 return;
3991 }
3992 /*
3993 * Since field layout sneeks in oops before values, we will be able to condense
3994 * blocks. There is potential to compact between super, own refs and values
3995 * containing refs.
3996 *
3997 * Currently compaction is slightly limited due to values being 8 byte aligned.
3998 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3999 * and maybe it doesn't need to be.
4000 */
4001 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
4002 (_sort_Fn)OopMapBlock::compare_offset);
4003 if (nonstatic_oop_map_count < 2) {
4004 return;
4005 }
4006
4007 //Make a temp copy, and iterate through and copy back into the orig
4008 ResourceMark rm(THREAD);
4009 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
4010 nonstatic_oop_map_count);
4011 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
4012 copy(oop_maps_copy);
4013 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
4014 unsigned int new_count = 1;
4015 oop_maps_copy++;
4016 while(oop_maps_copy < oop_maps_copy_end) {
4017 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4018 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4019 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4020 } else {
4021 nonstatic_oop_map++;
4022 new_count++;
4023 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4024 nonstatic_oop_map->set_count(oop_maps_copy->count());
4025 }
4026 oop_maps_copy++;
4027 }
4028 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
4029 nonstatic_oop_map_count = new_count;
4030 }
4031
4032 void print_on(outputStream* st) const {
4033 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
4034 if (nonstatic_oop_map_count > 0) {
4035 OopMapBlock* map = nonstatic_oop_maps;
4036 OopMapBlock* last_map = last_oop_map();
4037 assert(map <= last_map, "Last less than first");
4038 while (map <= last_map) {
4039 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4040 map->offset() + map->offset_span() - heapOopSize, map->count());
4041 map++;
4042 }
4043 }
4044 }
4045
4046 void print_value_on(outputStream* st) const {
4047 print_on(st);
4048 }
4049
4050 };
4051
4052 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
4053 const char* msg,
4054 const Symbol* name,
4055 const Symbol* sig) const {
4056
4057 ResourceMark rm(THREAD);
4058 if (name == NULL || sig == NULL) {
4059 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4060 vmSymbols::java_lang_ClassFormatError(),
4061 "class: %s - %s", _class_name->as_C_string(), msg);
4062 }
4063 else {
4064 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4065 vmSymbols::java_lang_ClassFormatError(),
4066 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4067 _class_name->as_C_string(), msg);
4068 }
4069 }
4070
4071 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4072 void ClassFileParser::layout_fields(ConstantPool* cp,
4073 const FieldAllocationCount* fac,
4074 const ClassAnnotationCollector* parsed_annotations,
4075 FieldLayoutInfo* info,
4076 TRAPS) {
4077
4078 assert(cp != NULL, "invariant");
4079
4080 // Field size and offset computation
4081 int nonstatic_field_size = _super_klass == NULL ? 0 :
4082 _super_klass->nonstatic_field_size();
4083 int next_nonstatic_valuetype_offset = 0;
4084 int first_nonstatic_valuetype_offset = 0;
4085
4086 // Fields that are value types are handled differently depending if they are static or not:
4087 // - static fields are oops
4088 // - non-static fields are embedded
4089
4090 // Count the contended fields by type.
4091 //
4092 // We ignore static fields, because @Contended is not supported for them.
4093 // The layout code below will also ignore the static fields.
4094 int nonstatic_contended_count = 0;
4095 FieldAllocationCount fac_contended;
4096 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4097 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4098 if (fs.is_contended()) {
4099 fac_contended.count[atype]++;
4100 if (!fs.access_flags().is_static()) {
4101 nonstatic_contended_count++;
4102 }
4103 }
4104 }
4105
4106
4107 // Calculate the starting byte offsets
4108 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4109 // Value types in static fields are not embedded, they are handled with oops
4110 int next_static_double_offset = next_static_oop_offset +
4111 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4112 if (fac->count[STATIC_DOUBLE]) {
4113 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4114 }
4115
4116 int next_static_word_offset = next_static_double_offset +
4117 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4118 int next_static_short_offset = next_static_word_offset +
4119 ((fac->count[STATIC_WORD]) * BytesPerInt);
4120 int next_static_byte_offset = next_static_short_offset +
4121 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4122
4123 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4124 nonstatic_field_size * heapOopSize;
4125
4126 // First field of value types is aligned on a long boundary in order to ease
4127 // in-lining of value types (with header removal) in packed arrays and
4128 // flatten value types
4129 int initial_value_type_padding = 0;
4130 if (is_value_type()) {
4131 int old = nonstatic_fields_start;
4132 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4133 initial_value_type_padding = nonstatic_fields_start - old;
4134 }
4135
4136 int next_nonstatic_field_offset = nonstatic_fields_start;
4137
4138 const bool is_contended_class = parsed_annotations->is_contended();
4139
4140 // Class is contended, pad before all the fields
4141 if (is_contended_class) {
4142 next_nonstatic_field_offset += ContendedPaddingWidth;
4143 }
4144
4145 // Temporary value types restrictions
4146 if (is_value_type()) {
4147 if (is_contended_class) {
4148 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4149 return;
4150 }
4151 }
4152
4153 // Compute the non-contended fields count.
4154 // The packing code below relies on these counts to determine if some field
4155 // can be squeezed into the alignment gap. Contended fields are obviously
4156 // exempt from that.
4157 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4158 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4159 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4160 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4161 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4162
4163 int static_value_type_count = 0;
4164 int nonstatic_value_type_count = 0;
4165 int* nonstatic_value_type_indexes = NULL;
4166 Klass** nonstatic_value_type_klasses = NULL;
4167 unsigned int value_type_oop_map_count = 0;
4168 int not_flattened_value_types = 0;
4169
4170 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4171
4172 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4173 max_nonstatic_value_type);
4174 for (int i = 0; i < max_nonstatic_value_type; i++) {
4175 nonstatic_value_type_indexes[i] = -1;
4176 }
4177 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4178 max_nonstatic_value_type);
4179
4180 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4181 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4182 // Pre-resolve the flattenable field and check for value type circularity
4183 // issues. Note that super-class circularity checks are not needed here
4184 // because flattenable fields can only be in value types and value types
4185 // only have java.lang.Object as their super class.
4186 // Also, note that super-interface circularity checks are not needed
4187 // because interfaces cannot be value types.
4188 ResourceMark rm;
4189 Symbol* sig = fs.signature();
4190 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4191 sig->utf8_length() - 2, CHECK);
4192 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4193 name->decrement_refcount();
4194 THROW(vmSymbols::java_lang_ClassFormatError());
4195 }
4196 name->decrement_refcount();
4197 Klass* klass =
4198 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4199 Handle(THREAD, _loader_data->class_loader()),
4200 _protection_domain, true, CHECK);
4201 assert(klass != NULL, "Sanity check");
4202 if (!klass->access_flags().is_value_type()) {
4203 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4204 }
4205 static_value_type_count++;
4206 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4207 // Pre-resolve the flattenable field and check for value type circularity issues.
4208 ResourceMark rm;
4209 Symbol* sig = fs.signature();
4210 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4211 sig->utf8_length() - 2, CHECK);
4212 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4213 name->decrement_refcount();
4214 THROW(vmSymbols::java_lang_ClassFormatError());
4215 }
4216 name->decrement_refcount();
4217 Klass* klass =
4218 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4219 Handle(THREAD, _loader_data->class_loader()),
4220 _protection_domain, true, CHECK);
4221 assert(klass != NULL, "Sanity check");
4222 if (!klass->access_flags().is_value_type()) {
4223 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4224 }
4225 ValueKlass* vk = ValueKlass::cast(klass);
4226 // Conditions to apply flattening or not should be defined in a single place
4227 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4228 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4229 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4230 nonstatic_value_type_count++;
4231
4232 ValueKlass* vklass = ValueKlass::cast(klass);
4233 if (vklass->contains_oops()) {
4234 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4235 }
4236 fs.set_flattened(true);
4237 } else {
4238 not_flattened_value_types++;
4239 fs.set_flattened(false);
4240 }
4241 }
4242 }
4243
4244 // Adjusting non_static_oop_count to take into account not flattened value types;
4245 nonstatic_oop_count += not_flattened_value_types;
4246
4247 // Total non-static fields count, including every contended field
4248 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4249 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4250 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4251
4252 const bool super_has_nonstatic_fields =
4253 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4254 const bool has_nonstatic_fields =
4255 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4256 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4257
4258 if (is_value_type() && (!has_nonstatic_fields)) {
4259 // There are a number of fixes required throughout the type system and JIT
4260 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4261 return;
4262 }
4263
4264 // Prepare list of oops for oop map generation.
4265 //
4266 // "offset" and "count" lists are describing the set of contiguous oop
4267 // regions. offset[i] is the start of the i-th region, which then has
4268 // count[i] oops following. Before we know how many regions are required,
4269 // we pessimistically allocate the maps to fit all the oops into the
4270 // distinct regions.
4271 //
4272 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4273 int max_oop_map_count =
4274 super_oop_map_count +
4275 fac->count[NONSTATIC_OOP] +
4276 value_type_oop_map_count +
4277 not_flattened_value_types;
4278
4279 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4280 if (super_oop_map_count > 0) {
4281 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4282 _super_klass->nonstatic_oop_map_count());
4283 }
4284
4285 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4286
4287 bool compact_fields = CompactFields;
4288 int allocation_style = FieldsAllocationStyle;
4289 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4290 assert(false, "0 <= FieldsAllocationStyle <= 2");
4291 allocation_style = 1; // Optimistic
4292 }
4293
4294 // The next classes have predefined hard-coded fields offsets
4295 // (see in JavaClasses::compute_hard_coded_offsets()).
4296 // Use default fields allocation order for them.
4297 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4298 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4299 _class_name == vmSymbols::java_lang_Class() ||
4300 _class_name == vmSymbols::java_lang_ClassLoader() ||
4301 _class_name == vmSymbols::java_lang_ref_Reference() ||
4302 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4303 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4304 _class_name == vmSymbols::java_lang_String() ||
4305 _class_name == vmSymbols::java_lang_Throwable() ||
4306 _class_name == vmSymbols::java_lang_Boolean() ||
4307 _class_name == vmSymbols::java_lang_Character() ||
4308 _class_name == vmSymbols::java_lang_Float() ||
4309 _class_name == vmSymbols::java_lang_Double() ||
4310 _class_name == vmSymbols::java_lang_Byte() ||
4311 _class_name == vmSymbols::java_lang_Short() ||
4312 _class_name == vmSymbols::java_lang_Integer() ||
4313 _class_name == vmSymbols::java_lang_Long())) {
4314 allocation_style = 0; // Allocate oops first
4315 compact_fields = false; // Don't compact fields
4316 }
4317
4318 int next_nonstatic_oop_offset = 0;
4319 int next_nonstatic_double_offset = 0;
4320
4321 // Rearrange fields for a given allocation style
4322 if( allocation_style == 0 ) {
4323 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4324 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4325 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4326 (nonstatic_oop_count * heapOopSize);
4327 } else if( allocation_style == 1 ) {
4328 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4329 next_nonstatic_double_offset = next_nonstatic_field_offset;
4330 } else if( allocation_style == 2 ) {
4331 // Fields allocation: oops fields in super and sub classes are together.
4332 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4333 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4334 allocation_style = 0; // allocate oops first
4335 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4336 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4337 (nonstatic_oop_count * heapOopSize);
4338 }
4339 }
4340 if( allocation_style == 2 ) {
4341 allocation_style = 1; // allocate oops last
4342 next_nonstatic_double_offset = next_nonstatic_field_offset;
4343 }
4344 } else {
4345 ShouldNotReachHere();
4346 }
4347
4348 int nonstatic_oop_space_count = 0;
4349 int nonstatic_word_space_count = 0;
4350 int nonstatic_short_space_count = 0;
4351 int nonstatic_byte_space_count = 0;
4352 int nonstatic_oop_space_offset = 0;
4353 int nonstatic_word_space_offset = 0;
4354 int nonstatic_short_space_offset = 0;
4355 int nonstatic_byte_space_offset = 0;
4356
4357 // Try to squeeze some of the fields into the gaps due to
4358 // long/double alignment.
4359 if (nonstatic_double_count > 0) {
4360 int offset = next_nonstatic_double_offset;
4361 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4362 if (compact_fields && offset != next_nonstatic_double_offset) {
4363 // Allocate available fields into the gap before double field.
4364 int length = next_nonstatic_double_offset - offset;
4365 assert(length == BytesPerInt, "");
4366 nonstatic_word_space_offset = offset;
4367 if (nonstatic_word_count > 0) {
4368 nonstatic_word_count -= 1;
4369 nonstatic_word_space_count = 1; // Only one will fit
4370 length -= BytesPerInt;
4371 offset += BytesPerInt;
4372 }
4373 nonstatic_short_space_offset = offset;
4374 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4375 nonstatic_short_count -= 1;
4376 nonstatic_short_space_count += 1;
4377 length -= BytesPerShort;
4378 offset += BytesPerShort;
4379 }
4380 nonstatic_byte_space_offset = offset;
4381 while (length > 0 && nonstatic_byte_count > 0) {
4382 nonstatic_byte_count -= 1;
4383 nonstatic_byte_space_count += 1;
4384 length -= 1;
4385 }
4386 // Allocate oop field in the gap if there are no other fields for that.
4387 nonstatic_oop_space_offset = offset;
4388 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4389 allocation_style != 0) { // when oop fields not first
4390 nonstatic_oop_count -= 1;
4391 nonstatic_oop_space_count = 1; // Only one will fit
4392 length -= heapOopSize;
4393 offset += heapOopSize;
4394 }
4395 }
4396 }
4397
4398 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4399 (nonstatic_double_count * BytesPerLong);
4400 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4401 (nonstatic_word_count * BytesPerInt);
4402 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4403 (nonstatic_short_count * BytesPerShort);
4404 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4405 nonstatic_byte_count;
4406
4407 // let oops jump before padding with this allocation style
4408 if( allocation_style == 1 ) {
4409 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4410 if( nonstatic_oop_count > 0 ) {
4411 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4412 }
4413 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4414 }
4415
4416 // Aligning embedded value types
4417 // bug below, the current algorithm to layout embedded value types always put them at the
4418 // end of the layout, which doesn't match the different allocation policies the VM is
4419 // supposed to provide => FixMe
4420 // Note also that the current alignment policy is to make each value type starting on a
4421 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4422 // align value types according to their most constrained internal type.
4423 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4424 int next_value_type_index = 0;
4425
4426 // Iterate over fields again and compute correct offsets.
4427 // The field allocation type was temporarily stored in the offset slot.
4428 // oop fields are located before non-oop fields (static and non-static).
4429 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4430
4431 // skip already laid out fields
4432 if (fs.is_offset_set()) continue;
4433
4434 // contended instance fields are handled below
4435 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4436
4437 int real_offset = 0;
4438 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4439
4440 // pack the rest of the fields
4441 switch (atype) {
4442 // Value types in static fields are handled with oops
4443 case STATIC_FLATTENABLE: // Fallthrough
4444 case STATIC_OOP:
4445 real_offset = next_static_oop_offset;
4446 next_static_oop_offset += heapOopSize;
4447 break;
4448 case STATIC_BYTE:
4449 real_offset = next_static_byte_offset;
4450 next_static_byte_offset += 1;
4451 break;
4452 case STATIC_SHORT:
4453 real_offset = next_static_short_offset;
4454 next_static_short_offset += BytesPerShort;
4455 break;
4456 case STATIC_WORD:
4457 real_offset = next_static_word_offset;
4458 next_static_word_offset += BytesPerInt;
4459 break;
4460 case STATIC_DOUBLE:
4461 real_offset = next_static_double_offset;
4462 next_static_double_offset += BytesPerLong;
4463 break;
4464 case NONSTATIC_FLATTENABLE:
4465 if (fs.is_flattened()) {
4466 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4467 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4468 assert(klass->access_flags().is_value_type(),"Must be a value type");
4469 ValueKlass* vklass = ValueKlass::cast(klass);
4470 real_offset = next_nonstatic_valuetype_offset;
4471 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4472 // aligning next value type on a 64 bits boundary
4473 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4474 next_value_type_index += 1;
4475
4476 if (vklass->contains_oops()) { // add flatten oop maps
4477 int diff = real_offset - vklass->first_field_offset();
4478 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4479 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4480 while (map < last_map) {
4481 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4482 map++;
4483 }
4484 }
4485 break;
4486 } else {
4487 // Fall through
4488 }
4489 case NONSTATIC_OOP:
4490 if( nonstatic_oop_space_count > 0 ) {
4491 real_offset = nonstatic_oop_space_offset;
4492 nonstatic_oop_space_offset += heapOopSize;
4493 nonstatic_oop_space_count -= 1;
4494 } else {
4495 real_offset = next_nonstatic_oop_offset;
4496 next_nonstatic_oop_offset += heapOopSize;
4497 }
4498 nonstatic_oop_maps->add(real_offset, 1);
4499 break;
4500 case NONSTATIC_BYTE:
4501 if( nonstatic_byte_space_count > 0 ) {
4502 real_offset = nonstatic_byte_space_offset;
4503 nonstatic_byte_space_offset += 1;
4504 nonstatic_byte_space_count -= 1;
4505 } else {
4506 real_offset = next_nonstatic_byte_offset;
4507 next_nonstatic_byte_offset += 1;
4508 }
4509 break;
4510 case NONSTATIC_SHORT:
4511 if( nonstatic_short_space_count > 0 ) {
4512 real_offset = nonstatic_short_space_offset;
4513 nonstatic_short_space_offset += BytesPerShort;
4514 nonstatic_short_space_count -= 1;
4515 } else {
4516 real_offset = next_nonstatic_short_offset;
4517 next_nonstatic_short_offset += BytesPerShort;
4518 }
4519 break;
4520 case NONSTATIC_WORD:
4521 if( nonstatic_word_space_count > 0 ) {
4522 real_offset = nonstatic_word_space_offset;
4523 nonstatic_word_space_offset += BytesPerInt;
4524 nonstatic_word_space_count -= 1;
4525 } else {
4526 real_offset = next_nonstatic_word_offset;
4527 next_nonstatic_word_offset += BytesPerInt;
4528 }
4529 break;
4530 case NONSTATIC_DOUBLE:
4531 real_offset = next_nonstatic_double_offset;
4532 next_nonstatic_double_offset += BytesPerLong;
4533 break;
4534 default:
4535 ShouldNotReachHere();
4536 }
4537 fs.set_offset(real_offset);
4538 }
4539
4540
4541 // Handle the contended cases.
4542 //
4543 // Each contended field should not intersect the cache line with another contended field.
4544 // In the absence of alignment information, we end up with pessimistically separating
4545 // the fields with full-width padding.
4546 //
4547 // Additionally, this should not break alignment for the fields, so we round the alignment up
4548 // for each field.
4549 if (nonstatic_contended_count > 0) {
4550
4551 // if there is at least one contended field, we need to have pre-padding for them
4552 next_nonstatic_padded_offset += ContendedPaddingWidth;
4553
4554 // collect all contended groups
4555 ResourceBitMap bm(cp->size());
4556 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4557 // skip already laid out fields
4558 if (fs.is_offset_set()) continue;
4559
4560 if (fs.is_contended()) {
4561 bm.set_bit(fs.contended_group());
4562 }
4563 }
4564
4565 int current_group = -1;
4566 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4567
4568 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4569
4570 // skip already laid out fields
4571 if (fs.is_offset_set()) continue;
4572
4573 // skip non-contended fields and fields from different group
4574 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4575
4576 // handle statics below
4577 if (fs.access_flags().is_static()) continue;
4578
4579 int real_offset = 0;
4580 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4581
4582 switch (atype) {
4583 case NONSTATIC_BYTE:
4584 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4585 real_offset = next_nonstatic_padded_offset;
4586 next_nonstatic_padded_offset += 1;
4587 break;
4588
4589 case NONSTATIC_SHORT:
4590 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4591 real_offset = next_nonstatic_padded_offset;
4592 next_nonstatic_padded_offset += BytesPerShort;
4593 break;
4594
4595 case NONSTATIC_WORD:
4596 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4597 real_offset = next_nonstatic_padded_offset;
4598 next_nonstatic_padded_offset += BytesPerInt;
4599 break;
4600
4601 case NONSTATIC_DOUBLE:
4602 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4603 real_offset = next_nonstatic_padded_offset;
4604 next_nonstatic_padded_offset += BytesPerLong;
4605 break;
4606
4607 // Value types in static fields are handled with oops
4608 case NONSTATIC_FLATTENABLE:
4609 throwValueTypeLimitation(THREAD_AND_LOCATION,
4610 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4611 return;
4612
4613 case NONSTATIC_OOP:
4614 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4615 real_offset = next_nonstatic_padded_offset;
4616 next_nonstatic_padded_offset += heapOopSize;
4617 nonstatic_oop_maps->add(real_offset, 1);
4618 break;
4619
4620 default:
4621 ShouldNotReachHere();
4622 }
4623
4624 if (fs.contended_group() == 0) {
4625 // Contended group defines the equivalence class over the fields:
4626 // the fields within the same contended group are not inter-padded.
4627 // The only exception is default group, which does not incur the
4628 // equivalence, and so requires intra-padding.
4629 next_nonstatic_padded_offset += ContendedPaddingWidth;
4630 }
4631
4632 fs.set_offset(real_offset);
4633 } // for
4634
4635 // Start laying out the next group.
4636 // Note that this will effectively pad the last group in the back;
4637 // this is expected to alleviate memory contention effects for
4638 // subclass fields and/or adjacent object.
4639 // If this was the default group, the padding is already in place.
4640 if (current_group != 0) {
4641 next_nonstatic_padded_offset += ContendedPaddingWidth;
4642 }
4643 }
4644
4645 // handle static fields
4646 }
4647
4648 // Entire class is contended, pad in the back.
4649 // This helps to alleviate memory contention effects for subclass fields
4650 // and/or adjacent object.
4651 if (is_contended_class) {
4652 assert(!is_value_type(), "@Contended not supported for value types yet");
4653 next_nonstatic_padded_offset += ContendedPaddingWidth;
4654 }
4655
4656 int notaligned_nonstatic_fields_end;
4657 if (nonstatic_value_type_count != 0) {
4658 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4659 } else {
4660 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4661 }
4662
4663 int nonstatic_field_sz_align = heapOopSize;
4664 if (is_value_type()) {
4665 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4666 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4667 }
4668 }
4669 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4670 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4671 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4672
4673 int static_field_size = (static_fields_end -
4674 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4675 nonstatic_field_size = nonstatic_field_size +
4676 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4677
4678 int instance_size = align_object_size(instance_end / wordSize);
4679
4680 assert(instance_size == align_object_size(align_up(
4681 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4682 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4683
4684
4685 // Invariant: nonstatic_field end/start should only change if there are
4686 // nonstatic fields in the class, or if the class is contended. We compare
4687 // against the non-aligned value, so that end alignment will not fail the
4688 // assert without actually having the fields.
4689 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4690 is_contended_class ||
4691 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4692
4693 // Number of non-static oop map blocks allocated at end of klass.
4694 nonstatic_oop_maps->compact(THREAD);
4695
4696 #ifndef PRODUCT
4697 if ((PrintFieldLayout && !is_value_type()) ||
4698 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4699 print_field_layout(_class_name,
4700 _fields,
4701 cp,
4702 instance_size,
4703 nonstatic_fields_start,
4704 nonstatic_fields_end,
4705 static_fields_end);
4706 nonstatic_oop_maps->print_on(tty);
4707 tty->print("\n");
4708 }
4709
4710 #endif
4711 // Pass back information needed for InstanceKlass creation
4712 info->oop_map_blocks = nonstatic_oop_maps;
4713 info->instance_size = instance_size;
4714 info->static_field_size = static_field_size;
4715 info->nonstatic_field_size = nonstatic_field_size;
4716 info->has_nonstatic_fields = has_nonstatic_fields;
4717 }
4718
4719 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4720 assert(ik != NULL, "invariant");
4721
4722 const Klass* const super = ik->super();
4723
4724 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4725 // in which case we don't have to register objects as finalizable
4726 if (!_has_empty_finalizer) {
4727 if (_has_finalizer ||
4728 (super != NULL && super->has_finalizer())) {
4729 ik->set_has_finalizer();
4730 }
4731 }
4732
4733 #ifdef ASSERT
4734 bool f = false;
4735 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4736 vmSymbols::void_method_signature());
4737 if (m != NULL && !m->is_empty_method()) {
4738 f = true;
4739 }
4740
4741 // Spec doesn't prevent agent from redefinition of empty finalizer.
4742 // Despite the fact that it's generally bad idea and redefined finalizer
4743 // will not work as expected we shouldn't abort vm in this case
4744 if (!ik->has_redefined_this_or_super()) {
4745 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4746 }
4747 #endif
4748
4749 // Check if this klass supports the java.lang.Cloneable interface
4750 if (SystemDictionary::Cloneable_klass_loaded()) {
4751 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4752 if (ik->is_value()) {
4753 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4754 return;
4755 }
4756 ik->set_is_cloneable();
4757 }
4758 }
4759
4760 // Check if this klass has a vanilla default constructor
4761 if (super == NULL) {
4762 // java.lang.Object has empty default constructor
4763 ik->set_has_vanilla_constructor();
4764 } else {
4765 if (super->has_vanilla_constructor() &&
4766 _has_vanilla_constructor) {
4767 ik->set_has_vanilla_constructor();
4768 }
4769 #ifdef ASSERT
4770 bool v = false;
4771 if (super->has_vanilla_constructor()) {
4772 const Method* const constructor =
4773 ik->find_method(vmSymbols::object_initializer_name(),
4774 vmSymbols::void_method_signature());
4775 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4776 v = true;
4777 }
4778 }
4779 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4780 #endif
4781 }
4782
4783 // If it cannot be fast-path allocated, set a bit in the layout helper.
4784 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4785 assert(ik->size_helper() > 0, "layout_helper is initialized");
4786 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4787 || ik->is_abstract() || ik->is_interface()
4788 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4789 || ik->size_helper() >= FastAllocateSizeLimit) {
4790 // Forbid fast-path allocation.
4791 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4792 ik->set_layout_helper(lh);
4793 }
4794 }
4795
4796 bool ClassFileParser::supports_value_types() const {
4797 // Value types are only supported by class file version 55 and later
4798 return _major_version >= JAVA_11_VERSION;
4799 }
4800
4801 // Attach super classes and interface classes to class loader data
4802 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4803 TRAPS) {
4804 assert(defined_klass != NULL, "invariant");
4805
4806 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4807 if (defining_loader_data->is_the_null_class_loader_data()) {
4808 // Dependencies to null class loader data are implicit.
4809 return;
4810 } else {
4811 // add super class dependency
4812 Klass* const super = defined_klass->super();
4813 if (super != NULL) {
4814 defining_loader_data->record_dependency(super);
4815 }
4816
4817 // add super interface dependencies
4818 const Array<InstanceKlass*>* const local_interfaces = defined_klass->local_interfaces();
4819 if (local_interfaces != NULL) {
4820 const int length = local_interfaces->length();
4821 for (int i = 0; i < length; i++) {
4822 defining_loader_data->record_dependency(local_interfaces->at(i));
4823 }
4824 }
4825
4826 for(int i = 0; i < defined_klass->java_fields_count(); i++) {
4827 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) {
4828 const Klass* klass = defined_klass->get_value_field_klass(i);
4829 defining_loader_data->record_dependency(klass);
4830 }
4831 }
4832 }
4833 }
4834
4835 // utility methods for appending an array with check for duplicates
4836
4837 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4838 const Array<InstanceKlass*>* const ifs) {
4839 // iterate over new interfaces
4840 for (int i = 0; i < ifs->length(); i++) {
4841 InstanceKlass* const e = ifs->at(i);
4842 assert(e->is_klass() && e->is_interface(), "just checking");
4843 // add new interface
4844 result->append_if_missing(e);
4845 }
4846 }
4847
4848 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4849 Array<InstanceKlass*>* local_ifs,
4850 ClassLoaderData* loader_data,
4851 TRAPS) {
4852 assert(local_ifs != NULL, "invariant");
4853 assert(loader_data != NULL, "invariant");
4854
4855 // Compute maximum size for transitive interfaces
4856 int max_transitive_size = 0;
4857 int super_size = 0;
4858 // Add superclass transitive interfaces size
4859 if (super != NULL) {
4860 super_size = super->transitive_interfaces()->length();
4861 max_transitive_size += super_size;
4862 }
4863 // Add local interfaces' super interfaces
4864 const int local_size = local_ifs->length();
4865 for (int i = 0; i < local_size; i++) {
4866 InstanceKlass* const l = local_ifs->at(i);
4867 max_transitive_size += l->transitive_interfaces()->length();
4868 }
4869 // Finally add local interfaces
4870 max_transitive_size += local_size;
4871 // Construct array
4872 if (max_transitive_size == 0) {
4873 // no interfaces, use canonicalized array
4874 return Universe::the_empty_instance_klass_array();
4875 } else if (max_transitive_size == super_size) {
4876 // no new local interfaces added, share superklass' transitive interface array
4877 return super->transitive_interfaces();
4878 } else if (max_transitive_size == local_size) {
4879 // only local interfaces added, share local interface array
4880 return local_ifs;
4881 } else {
4882 ResourceMark rm;
4883 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4884
4885 // Copy down from superclass
4886 if (super != NULL) {
4887 append_interfaces(result, super->transitive_interfaces());
4888 }
4889
4890 // Copy down from local interfaces' superinterfaces
4891 for (int i = 0; i < local_size; i++) {
4892 InstanceKlass* const l = local_ifs->at(i);
4893 append_interfaces(result, l->transitive_interfaces());
4894 }
4895 // Finally add local interfaces
4896 append_interfaces(result, local_ifs);
4897
4898 // length will be less than the max_transitive_size if duplicates were removed
4899 const int length = result->length();
4900 assert(length <= max_transitive_size, "just checking");
4901 Array<InstanceKlass*>* const new_result =
4902 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4903 for (int i = 0; i < length; i++) {
4904 InstanceKlass* const e = result->at(i);
4905 assert(e != NULL, "just checking");
4906 new_result->at_put(i, e);
4907 }
4908 return new_result;
4909 }
4910 }
4911
4912 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4913 assert(this_klass != NULL, "invariant");
4914 const Klass* const super = this_klass->super();
4915 if (super != NULL) {
4916
4917 // If the loader is not the boot loader then throw an exception if its
4918 // superclass is in package jdk.internal.reflect and its loader is not a
4919 // special reflection class loader
4920 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4921 assert(super->is_instance_klass(), "super is not instance klass");
4922 PackageEntry* super_package = super->package();
4923 if (super_package != NULL &&
4924 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4925 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4926 ResourceMark rm(THREAD);
4927 Exceptions::fthrow(
4928 THREAD_AND_LOCATION,
4929 vmSymbols::java_lang_IllegalAccessError(),
4930 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4931 this_klass->external_name(),
4932 this_klass->class_loader_data()->loader_name_and_id(),
4933 super->external_name());
4934 return;
4935 }
4936 }
4937
4938 Reflection::VerifyClassAccessResults vca_result =
4939 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4940 if (vca_result != Reflection::ACCESS_OK) {
4941 ResourceMark rm(THREAD);
4942 char* msg = Reflection::verify_class_access_msg(this_klass,
4943 InstanceKlass::cast(super),
4944 vca_result);
4945 if (msg == NULL) {
4946 bool same_module = (this_klass->module() == super->module());
4947 Exceptions::fthrow(
4948 THREAD_AND_LOCATION,
4949 vmSymbols::java_lang_IllegalAccessError(),
4950 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4951 this_klass->external_name(),
4952 super->is_abstract() ? "abstract " : "",
4953 super->external_name(),
4954 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4955 (same_module) ? "" : "; ",
4956 (same_module) ? "" : super->class_in_module_of_loader());
4957 } else {
4958 // Add additional message content.
4959 Exceptions::fthrow(
4960 THREAD_AND_LOCATION,
4961 vmSymbols::java_lang_IllegalAccessError(),
4962 "superclass access check failed: %s",
4963 msg);
4964 }
4965 }
4966 }
4967 }
4968
4969
4970 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4971 assert(this_klass != NULL, "invariant");
4972 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4973 const int lng = local_interfaces->length();
4974 for (int i = lng - 1; i >= 0; i--) {
4975 InstanceKlass* const k = local_interfaces->at(i);
4976 assert (k != NULL && k->is_interface(), "invalid interface");
4977 Reflection::VerifyClassAccessResults vca_result =
4978 Reflection::verify_class_access(this_klass, k, false);
4979 if (vca_result != Reflection::ACCESS_OK) {
4980 ResourceMark rm(THREAD);
4981 char* msg = Reflection::verify_class_access_msg(this_klass,
4982 k,
4983 vca_result);
4984 if (msg == NULL) {
4985 bool same_module = (this_klass->module() == k->module());
4986 Exceptions::fthrow(
4987 THREAD_AND_LOCATION,
4988 vmSymbols::java_lang_IllegalAccessError(),
4989 "class %s cannot access its superinterface %s (%s%s%s)",
4990 this_klass->external_name(),
4991 k->external_name(),
4992 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4993 (same_module) ? "" : "; ",
4994 (same_module) ? "" : k->class_in_module_of_loader());
4995 } else {
4996 // Add additional message content.
4997 Exceptions::fthrow(
4998 THREAD_AND_LOCATION,
4999 vmSymbols::java_lang_IllegalAccessError(),
5000 "superinterface check failed: %s",
5001 msg);
5002 }
5003 }
5004 }
5005 }
5006
5007
5008 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
5009 assert(this_klass != NULL, "invariant");
5010 const Array<Method*>* const methods = this_klass->methods();
5011 const int num_methods = methods->length();
5012
5013 // go thru each method and check if it overrides a final method
5014 for (int index = 0; index < num_methods; index++) {
5015 const Method* const m = methods->at(index);
5016
5017 // skip private, static, and <init> methods
5018 if ((!m->is_private() && !m->is_static()) &&
5019 (m->name() != vmSymbols::object_initializer_name())) {
5020
5021 const Symbol* const name = m->name();
5022 const Symbol* const signature = m->signature();
5023 const Klass* k = this_klass->super();
5024 const Method* super_m = NULL;
5025 while (k != NULL) {
5026 // skip supers that don't have final methods.
5027 if (k->has_final_method()) {
5028 // lookup a matching method in the super class hierarchy
5029 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
5030 if (super_m == NULL) {
5031 break; // didn't find any match; get out
5032 }
5033
5034 if (super_m->is_final() && !super_m->is_static() &&
5035 !super_m->access_flags().is_private()) {
5036 // matching method in super is final, and not static or private
5037 bool can_access = Reflection::verify_member_access(this_klass,
5038 super_m->method_holder(),
5039 super_m->method_holder(),
5040 super_m->access_flags(),
5041 false, false, CHECK);
5042 if (can_access) {
5043 // this class can access super final method and therefore override
5044 ResourceMark rm(THREAD);
5045 Exceptions::fthrow(THREAD_AND_LOCATION,
5046 vmSymbols::java_lang_VerifyError(),
5047 "class %s overrides final method %s.%s%s",
5048 this_klass->external_name(),
5049 super_m->method_holder()->external_name(),
5050 name->as_C_string(),
5051 signature->as_C_string()
5052 );
5053 return;
5054 }
5055 }
5056
5057 // continue to look from super_m's holder's super.
5058 k = super_m->method_holder()->super();
5059 continue;
5060 }
5061
5062 k = k->super();
5063 }
5064 }
5065 }
5066 }
5067
5068
5069 // assumes that this_klass is an interface
5070 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
5071 assert(this_klass != NULL, "invariant");
5072 assert(this_klass->is_interface(), "not an interface");
5073 const Array<Method*>* methods = this_klass->methods();
5074 const int num_methods = methods->length();
5075
5076 for (int index = 0; index < num_methods; index++) {
5077 const Method* const m = methods->at(index);
5078 // if m is static and not the init method, throw a verify error
5079 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
5080 ResourceMark rm(THREAD);
5081 Exceptions::fthrow(
5082 THREAD_AND_LOCATION,
5083 vmSymbols::java_lang_VerifyError(),
5084 "Illegal static method %s in interface %s",
5085 m->name()->as_C_string(),
5086 this_klass->external_name()
5087 );
5088 return;
5089 }
5090 }
5091 }
5092
5093 // utility methods for format checking
5094
5095 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
5096 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5097 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
5098 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
5099 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
5100 if (is_module) {
5101 ResourceMark rm(THREAD);
5102 Exceptions::fthrow(
5103 THREAD_AND_LOCATION,
5104 vmSymbols::java_lang_NoClassDefFoundError(),
5105 "%s is not a class because access_flag ACC_MODULE is set",
5106 _class_name->as_C_string());
5107 return;
5108 }
5109
5110 if (is_value_type && !EnableValhalla) {
5111 ResourceMark rm(THREAD);
5112 Exceptions::fthrow(
5113 THREAD_AND_LOCATION,
5114 vmSymbols::java_lang_ClassFormatError(),
5115 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5116 _class_name->as_C_string()
5117 );
5118 }
5119
5120 if (!_need_verify) { return; }
5121
5122 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5123 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5124 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5125 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5126 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5127 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5128 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5129
5130 if ((is_abstract && is_final) ||
5131 (is_interface && !is_abstract) ||
5132 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5133 (!is_interface && major_gte_15 && is_annotation) ||
5134 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5135 ResourceMark rm(THREAD);
5136 Exceptions::fthrow(
5137 THREAD_AND_LOCATION,
5138 vmSymbols::java_lang_ClassFormatError(),
5139 "Illegal class modifiers in class %s: 0x%X",
5140 _class_name->as_C_string(), flags
5141 );
5142 return;
5143 }
5144 }
5145
5146 static bool has_illegal_visibility(jint flags) {
5147 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5148 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5149 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5150
5151 return ((is_public && is_protected) ||
5152 (is_public && is_private) ||
5153 (is_protected && is_private));
5154 }
5155
5156 // A legal major_version.minor_version must be one of the following:
5157 //
5158 // Major_version = 45, any minor_version.
5159 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5160 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5161 //
5162 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5163 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5164 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5165 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5166 if (major != max_version) {
5167 ResourceMark rm(THREAD);
5168 Exceptions::fthrow(
5169 THREAD_AND_LOCATION,
5170 vmSymbols::java_lang_UnsupportedClassVersionError(),
5171 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5172 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5173 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5174 return;
5175 }
5176
5177 if (!Arguments::enable_preview()) {
5178 ResourceMark rm(THREAD);
5179 Exceptions::fthrow(
5180 THREAD_AND_LOCATION,
5181 vmSymbols::java_lang_UnsupportedClassVersionError(),
5182 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5183 class_name->as_C_string(), major, minor);
5184 return;
5185 }
5186
5187 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5188 if (major > max_version) {
5189 ResourceMark rm(THREAD);
5190 Exceptions::fthrow(
5191 THREAD_AND_LOCATION,
5192 vmSymbols::java_lang_UnsupportedClassVersionError(),
5193 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5194 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5195 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5196 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5197 ResourceMark rm(THREAD);
5198 Exceptions::fthrow(
5199 THREAD_AND_LOCATION,
5200 vmSymbols::java_lang_UnsupportedClassVersionError(),
5201 "%s (class file version %u.%u) was compiled with an invalid major version",
5202 class_name->as_C_string(), major, minor);
5203 } else if (minor != 0) {
5204 ResourceMark rm(THREAD);
5205 Exceptions::fthrow(
5206 THREAD_AND_LOCATION,
5207 vmSymbols::java_lang_UnsupportedClassVersionError(),
5208 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5209 class_name->as_C_string(), major, minor);
5210 }
5211 }
5212 }
5213 }
5214
5215 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5216 bool is_interface,
5217 bool is_value_type,
5218 TRAPS) const {
5219 if (!_need_verify) { return; }
5220
5221 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5222 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5223 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5224 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5225 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5226 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5227 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5228 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5229 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5230
5231 bool is_illegal = false;
5232
5233 if (is_interface) {
5234 if (!is_public || !is_static || !is_final || is_private ||
5235 is_protected || is_volatile || is_transient ||
5236 (major_gte_15 && is_enum)) {
5237 is_illegal = true;
5238 }
5239 } else { // not interface
5240 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5241 is_illegal = true;
5242 } else {
5243 if (is_value_type && !is_static && !is_final) {
5244 is_illegal = true;
5245 }
5246 }
5247 }
5248
5249 if (is_illegal) {
5250 ResourceMark rm(THREAD);
5251 Exceptions::fthrow(
5252 THREAD_AND_LOCATION,
5253 vmSymbols::java_lang_ClassFormatError(),
5254 "Illegal field modifiers in class %s: 0x%X",
5255 _class_name->as_C_string(), flags);
5256 return;
5257 }
5258 }
5259
5260 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5261 bool is_interface,
5262 bool is_value_type,
5263 const Symbol* name,
5264 TRAPS) const {
5265 if (!_need_verify) { return; }
5266
5267 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5268 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5269 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5270 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5271 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5272 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5273 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5274 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5275 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5276 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5277 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5278 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5279 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5280
5281 bool is_illegal = false;
5282
5283 if (is_interface) {
5284 if (major_gte_8) {
5285 // Class file version is JAVA_8_VERSION or later Methods of
5286 // interfaces may set any of the flags except ACC_PROTECTED,
5287 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5288 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5289 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5290 (is_native || is_protected || is_final || is_synchronized) ||
5291 // If a specific method of a class or interface has its
5292 // ACC_ABSTRACT flag set, it must not have any of its
5293 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5294 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5295 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5296 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5297 (is_abstract && (is_private || is_static || is_strict))) {
5298 is_illegal = true;
5299 }
5300 } else if (major_gte_15) {
5301 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5302 if (!is_public || is_private || is_protected || is_static || is_final ||
5303 is_synchronized || is_native || !is_abstract || is_strict) {
5304 is_illegal = true;
5305 }
5306 } else {
5307 // Class file version is pre-JAVA_1_5_VERSION
5308 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5309 is_illegal = true;
5310 }
5311 }
5312 } else { // not interface
5313 if (has_illegal_visibility(flags)) {
5314 is_illegal = true;
5315 } else {
5316 if (is_initializer) {
5317 if (is_static || is_final || is_synchronized || is_native ||
5318 is_abstract || (major_gte_15 && is_bridge)) {
5319 is_illegal = true;
5320 }
5321 } else { // not initializer
5322 if (is_value_type && is_synchronized && !is_static) {
5323 is_illegal = true;
5324 } else {
5325 if (is_abstract) {
5326 if ((is_final || is_native || is_private || is_static ||
5327 (major_gte_15 && (is_synchronized || is_strict)))) {
5328 is_illegal = true;
5329 }
5330 }
5331 }
5332 }
5333 }
5334 }
5335
5336 if (is_illegal) {
5337 ResourceMark rm(THREAD);
5338 Exceptions::fthrow(
5339 THREAD_AND_LOCATION,
5340 vmSymbols::java_lang_ClassFormatError(),
5341 "Method %s in class %s has illegal modifiers: 0x%X",
5342 name->as_C_string(), _class_name->as_C_string(), flags);
5343 return;
5344 }
5345 }
5346
5347 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5348 int length,
5349 TRAPS) const {
5350 assert(_need_verify, "only called when _need_verify is true");
5351 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5352 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5353 }
5354 }
5355
5356 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5357 // In class names, '/' separates unqualified names. This is verified in this function also.
5358 // Method names also may not contain the characters '<' or '>', unless <init>
5359 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5360 // method. Because these names have been checked as special cases before
5361 // calling this method in verify_legal_method_name.
5362 //
5363 // This method is also called from the modular system APIs in modules.cpp
5364 // to verify the validity of module and package names.
5365 bool ClassFileParser::verify_unqualified_name(const char* name,
5366 unsigned int length,
5367 int type) {
5368 for (const char* p = name; p != name + length;) {
5369 jchar ch = *p;
5370 if (ch < 128) {
5371 if (ch == '.' || ch == ';' || ch == '[' ) {
5372 return false; // do not permit '.', ';', or '['
5373 }
5374 if (ch == '/') {
5375 // check for '//' or leading or trailing '/' which are not legal
5376 // unqualified name must not be empty
5377 if (type == ClassFileParser::LegalClass) {
5378 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5379 return false;
5380 }
5381 } else {
5382 return false; // do not permit '/' unless it's class name
5383 }
5384 }
5385 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
5386 return false; // do not permit '<' or '>' in method names
5387 }
5388 p++;
5389 } else {
5390 char* tmp_p = UTF8::next(p, &ch);
5391 p = tmp_p;
5392 }
5393 }
5394 return true;
5395 }
5396
5397 // Take pointer to a string. Skip over the longest part of the string that could
5398 // be taken as a fieldname. Allow '/' if slash_ok is true.
5399 // Return a pointer to just past the fieldname.
5400 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5401 // being true, we saw consecutive slashes (meaning we were looking for a
5402 // qualified path but found something that was badly-formed).
5403 static const char* skip_over_field_name(const char* name,
5404 bool slash_ok,
5405 unsigned int length) {
5406 const char* p;
5407 jboolean last_is_slash = false;
5408 jboolean not_first_ch = false;
5409
5410 for (p = name; p != name + length; not_first_ch = true) {
5411 const char* old_p = p;
5412 jchar ch = *p;
5413 if (ch < 128) {
5414 p++;
5415 // quick check for ascii
5416 if ((ch >= 'a' && ch <= 'z') ||
5417 (ch >= 'A' && ch <= 'Z') ||
5418 (ch == '_' || ch == '$') ||
5419 (not_first_ch && ch >= '0' && ch <= '9')) {
5420 last_is_slash = false;
5421 continue;
5422 }
5423 if (slash_ok && ch == '/') {
5424 if (last_is_slash) {
5425 return NULL; // Don't permit consecutive slashes
5426 }
5427 last_is_slash = true;
5428 continue;
5429 }
5430 }
5431 else {
5432 jint unicode_ch;
5433 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5434 p = tmp_p;
5435 last_is_slash = false;
5436 // Check if ch is Java identifier start or is Java identifier part
5437 // 4672820: call java.lang.Character methods directly without generating separate tables.
5438 EXCEPTION_MARK;
5439
5440 // return value
5441 JavaValue result(T_BOOLEAN);
5442 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5443 JavaCallArguments args;
5444 args.push_int(unicode_ch);
5445
5446 // public static boolean isJavaIdentifierStart(char ch);
5447 JavaCalls::call_static(&result,
5448 SystemDictionary::Character_klass(),
5449 vmSymbols::isJavaIdentifierStart_name(),
5450 vmSymbols::int_bool_signature(),
5451 &args,
5452 THREAD);
5453
5454 if (HAS_PENDING_EXCEPTION) {
5455 CLEAR_PENDING_EXCEPTION;
5456 return 0;
5457 }
5458 if (result.get_jboolean()) {
5459 continue;
5460 }
5461
5462 if (not_first_ch) {
5463 // public static boolean isJavaIdentifierPart(char ch);
5464 JavaCalls::call_static(&result,
5465 SystemDictionary::Character_klass(),
5466 vmSymbols::isJavaIdentifierPart_name(),
5467 vmSymbols::int_bool_signature(),
5468 &args,
5469 THREAD);
5470
5471 if (HAS_PENDING_EXCEPTION) {
5472 CLEAR_PENDING_EXCEPTION;
5473 return 0;
5474 }
5475
5476 if (result.get_jboolean()) {
5477 continue;
5478 }
5479 }
5480 }
5481 return (not_first_ch) ? old_p : NULL;
5482 }
5483 return (not_first_ch) ? p : NULL;
5484 }
5485
5486 // Take pointer to a string. Skip over the longest part of the string that could
5487 // be taken as a field signature. Allow "void" if void_ok.
5488 // Return a pointer to just past the signature.
5489 // Return NULL if no legal signature is found.
5490 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5491 bool void_ok,
5492 unsigned int length,
5493 TRAPS) const {
5494 unsigned int array_dim = 0;
5495 while (length > 0) {
5496 switch (signature[0]) {
5497 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5498 case JVM_SIGNATURE_BOOLEAN:
5499 case JVM_SIGNATURE_BYTE:
5500 case JVM_SIGNATURE_CHAR:
5501 case JVM_SIGNATURE_SHORT:
5502 case JVM_SIGNATURE_INT:
5503 case JVM_SIGNATURE_FLOAT:
5504 case JVM_SIGNATURE_LONG:
5505 case JVM_SIGNATURE_DOUBLE:
5506 return signature + 1;
5507 case JVM_SIGNATURE_CLASS:
5508 {
5509 if (_major_version < JAVA_1_5_VERSION) {
5510 // Skip over the class name if one is there
5511 const char* const p = skip_over_field_name(signature + 1, true, --length);
5512
5513 // The next character better be a semicolon
5514 if (p && (p - signature) > 1 && p[0] == ';') {
5515 return p + 1;
5516 }
5517 }
5518 else {
5519 // Skip leading 'L' and ignore first appearance of ';'
5520 length--;
5521 signature++;
5522 char* c = strchr((char*) signature, ';');
5523 // Format check signature
5524 if (c != NULL) {
5525 ResourceMark rm(THREAD);
5526 int newlen = c - (char*) signature;
5527 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5528 strncpy(sig, signature, newlen);
5529 sig[newlen] = '\0';
5530
5531 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5532 if (!legal) {
5533 classfile_parse_error("Class name contains illegal character "
5534 "in descriptor in class file %s",
5535 CHECK_0);
5536 return NULL;
5537 }
5538 return signature + newlen + 1;
5539 }
5540 }
5541 return NULL;
5542 }
5543 case JVM_SIGNATURE_ARRAY:
5544 array_dim++;
5545 if (array_dim > 255) {
5546 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5547 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5548 }
5549 // The rest of what's there better be a legal signature
5550 signature++;
5551 length--;
5552 void_ok = false;
5553 break;
5554 default:
5555 return NULL;
5556 }
5557 }
5558 return NULL;
5559 }
5560
5561 // Checks if name is a legal class name.
5562 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5563 if (!_need_verify || _relax_verify) { return; }
5564
5565 char buf[fixed_buffer_size];
5566 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5567 unsigned int length = name->utf8_length();
5568 bool legal = false;
5569
5570 if (length > 0) {
5571 const char* p;
5572 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5573 p = skip_over_field_signature(bytes, false, length, CHECK);
5574 legal = (p != NULL) && ((p - bytes) == (int)length);
5575 } else if (_major_version < JAVA_1_5_VERSION) {
5576 if (bytes[0] != '<') {
5577 p = skip_over_field_name(bytes, true, length);
5578 legal = (p != NULL) && ((p - bytes) == (int)length);
5579 }
5580 } else {
5581 // 4900761: relax the constraints based on JSR202 spec
5582 // Class names may be drawn from the entire Unicode character set.
5583 // Identifiers between '/' must be unqualified names.
5584 // The utf8 string has been verified when parsing cpool entries.
5585 legal = verify_unqualified_name(bytes, length, LegalClass);
5586 }
5587 }
5588 if (!legal) {
5589 ResourceMark rm(THREAD);
5590 assert(_class_name != NULL, "invariant");
5591 Exceptions::fthrow(
5592 THREAD_AND_LOCATION,
5593 vmSymbols::java_lang_ClassFormatError(),
5594 "Illegal class name \"%s\" in class file %s", bytes,
5595 _class_name->as_C_string()
5596 );
5597 return;
5598 }
5599 }
5600
5601 // Checks if name is a legal field name.
5602 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5603 if (!_need_verify || _relax_verify) { return; }
5604
5605 char buf[fixed_buffer_size];
5606 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5607 unsigned int length = name->utf8_length();
5608 bool legal = false;
5609
5610 if (length > 0) {
5611 if (_major_version < JAVA_1_5_VERSION) {
5612 if (bytes[0] != '<') {
5613 const char* p = skip_over_field_name(bytes, false, length);
5614 legal = (p != NULL) && ((p - bytes) == (int)length);
5615 }
5616 } else {
5617 // 4881221: relax the constraints based on JSR202 spec
5618 legal = verify_unqualified_name(bytes, length, LegalField);
5619 }
5620 }
5621
5622 if (!legal) {
5623 ResourceMark rm(THREAD);
5624 assert(_class_name != NULL, "invariant");
5625 Exceptions::fthrow(
5626 THREAD_AND_LOCATION,
5627 vmSymbols::java_lang_ClassFormatError(),
5628 "Illegal field name \"%s\" in class %s", bytes,
5629 _class_name->as_C_string()
5630 );
5631 return;
5632 }
5633 }
5634
5635 // Checks if name is a legal method name.
5636 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5637 if (!_need_verify || _relax_verify) { return; }
5638
5639 assert(name != NULL, "method name is null");
5640 char buf[fixed_buffer_size];
5641 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5642 unsigned int length = name->utf8_length();
5643 bool legal = false;
5644
5645 if (length > 0) {
5646 if (bytes[0] == '<') {
5647 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5648 legal = true;
5649 }
5650 } else if (_major_version < JAVA_1_5_VERSION) {
5651 const char* p;
5652 p = skip_over_field_name(bytes, false, length);
5653 legal = (p != NULL) && ((p - bytes) == (int)length);
5654 } else {
5655 // 4881221: relax the constraints based on JSR202 spec
5656 legal = verify_unqualified_name(bytes, length, LegalMethod);
5657 }
5658 }
5659
5660 if (!legal) {
5661 ResourceMark rm(THREAD);
5662 assert(_class_name != NULL, "invariant");
5663 Exceptions::fthrow(
5664 THREAD_AND_LOCATION,
5665 vmSymbols::java_lang_ClassFormatError(),
5666 "Illegal method name \"%s\" in class %s", bytes,
5667 _class_name->as_C_string()
5668 );
5669 return;
5670 }
5671 }
5672
5673
5674 // Checks if signature is a legal field signature.
5675 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5676 const Symbol* signature,
5677 TRAPS) const {
5678 if (!_need_verify) { return; }
5679
5680 char buf[fixed_buffer_size];
5681 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5682 const unsigned int length = signature->utf8_length();
5683 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5684
5685 if (p == NULL || (p - bytes) != (int)length) {
5686 throwIllegalSignature("Field", name, signature, CHECK);
5687 }
5688 }
5689
5690 // Checks if signature is a legal method signature.
5691 // Returns number of parameters
5692 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5693 const Symbol* signature,
5694 TRAPS) const {
5695 if (!_need_verify) {
5696 // make sure caller's args_size will be less than 0 even for non-static
5697 // method so it will be recomputed in compute_size_of_parameters().
5698 return -2;
5699 }
5700
5701 // Class initializers cannot have args for class format version >= 51.
5702 if (name == vmSymbols::class_initializer_name() &&
5703 signature != vmSymbols::void_method_signature() &&
5704 _major_version >= JAVA_7_VERSION) {
5705 throwIllegalSignature("Method", name, signature, CHECK_0);
5706 return 0;
5707 }
5708
5709 unsigned int args_size = 0;
5710 char buf[fixed_buffer_size];
5711 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5712 unsigned int length = signature->utf8_length();
5713 const char* nextp;
5714
5715 // The first character must be a '('
5716 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5717 length--;
5718 // Skip over legal field signatures
5719 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5720 while ((length > 0) && (nextp != NULL)) {
5721 args_size++;
5722 if (p[0] == 'J' || p[0] == 'D') {
5723 args_size++;
5724 }
5725 length -= nextp - p;
5726 p = nextp;
5727 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5728 }
5729 // The first non-signature thing better be a ')'
5730 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5731 length--;
5732 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5733 // All internal methods must return void
5734 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5735 return args_size;
5736 }
5737 } else {
5738 // Now we better just have a return value
5739 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5740 if (nextp && ((int)length == (nextp - p))) {
5741 return args_size;
5742 }
5743 }
5744 }
5745 }
5746 // Report error
5747 throwIllegalSignature("Method", name, signature, CHECK_0);
5748 return 0;
5749 }
5750
5751 int ClassFileParser::static_field_size() const {
5752 assert(_field_info != NULL, "invariant");
5753 return _field_info->static_field_size;
5754 }
5755
5756 int ClassFileParser::total_oop_map_count() const {
5757 assert(_field_info != NULL, "invariant");
5758 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5759 }
5760
5761 jint ClassFileParser::layout_size() const {
5762 assert(_field_info != NULL, "invariant");
5763 return _field_info->instance_size;
5764 }
5765
5766 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5767 const Array<Method*>* methods) {
5768 assert(ik != NULL, "invariant");
5769 assert(methods != NULL, "invariant");
5770
5771 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5772 // (We used to do this lazily, but now we query it in Rewriter,
5773 // which is eagerly done for every method, so we might as well do it now,
5774 // when everything is fresh in memory.)
5775 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5776
5777 if (klass_id != vmSymbols::NO_SID) {
5778 for (int j = 0; j < methods->length(); ++j) {
5779 Method* method = methods->at(j);
5780 method->init_intrinsic_id();
5781
5782 if (CheckIntrinsics) {
5783 // Check if an intrinsic is defined for method 'method',
5784 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5785 if (method->intrinsic_id() != vmIntrinsics::_none &&
5786 !method->intrinsic_candidate()) {
5787 tty->print("Compiler intrinsic is defined for method [%s], "
5788 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5789 method->name_and_sig_as_C_string(),
5790 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5791 );
5792 tty->cr();
5793 DEBUG_ONLY(vm_exit(1));
5794 }
5795 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5796 // but there is no intrinsic available for it.
5797 if (method->intrinsic_candidate() &&
5798 method->intrinsic_id() == vmIntrinsics::_none) {
5799 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5800 "but no compiler intrinsic is defined for the method.%s",
5801 method->name_and_sig_as_C_string(),
5802 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5803 );
5804 tty->cr();
5805 DEBUG_ONLY(vm_exit(1));
5806 }
5807 }
5808 } // end for
5809
5810 #ifdef ASSERT
5811 if (CheckIntrinsics) {
5812 // Check for orphan methods in the current class. A method m
5813 // of a class C is orphan if an intrinsic is defined for method m,
5814 // but class C does not declare m.
5815 // The check is potentially expensive, therefore it is available
5816 // only in debug builds.
5817
5818 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5819 if (vmIntrinsics::_compiledLambdaForm == id) {
5820 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5821 // generated for the JVM from a LambdaForm and therefore no method
5822 // is defined for it.
5823 continue;
5824 }
5825
5826 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5827 // Check if the current class contains a method with the same
5828 // name, flags, signature.
5829 bool match = false;
5830 for (int j = 0; j < methods->length(); ++j) {
5831 const Method* method = methods->at(j);
5832 if (method->intrinsic_id() == id) {
5833 match = true;
5834 break;
5835 }
5836 }
5837
5838 if (!match) {
5839 char buf[1000];
5840 tty->print("Compiler intrinsic is defined for method [%s], "
5841 "but the method is not available in class [%s].%s",
5842 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5843 buf, sizeof(buf)),
5844 ik->name()->as_C_string(),
5845 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5846 );
5847 tty->cr();
5848 DEBUG_ONLY(vm_exit(1));
5849 }
5850 }
5851 } // end for
5852 } // CheckIntrinsics
5853 #endif // ASSERT
5854 }
5855 }
5856
5857 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5858 if (_klass != NULL) {
5859 return _klass;
5860 }
5861
5862 InstanceKlass* const ik =
5863 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5864
5865 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5866
5867 assert(_klass == ik, "invariant");
5868
5869 ik->set_has_passed_fingerprint_check(false);
5870 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5871 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5872 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5873 // This class matches with a class saved in an AOT library
5874 ik->set_has_passed_fingerprint_check(true);
5875 } else {
5876 ResourceMark rm;
5877 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5878 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5879 }
5880 }
5881
5882 if (ik->is_value()) {
5883 ValueKlass* vk = ValueKlass::cast(ik);
5884 oop val = ik->allocate_instance(CHECK_NULL);
5885 vk->set_default_value(val);
5886 }
5887
5888 return ik;
5889 }
5890
5891 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5892 assert(ik != NULL, "invariant");
5893
5894 // Set name and CLD before adding to CLD
5895 ik->set_class_loader_data(_loader_data);
5896 ik->set_name(_class_name);
5897
5898 // Add all classes to our internal class loader list here,
5899 // including classes in the bootstrap (NULL) class loader.
5900 const bool publicize = !is_internal();
5901
5902 _loader_data->add_class(ik, publicize);
5903
5904 set_klass_to_deallocate(ik);
5905
5906 assert(_field_info != NULL, "invariant");
5907 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5908 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5909 "sanity");
5910
5911 assert(ik->is_instance_klass(), "sanity");
5912 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5913
5914 // Fill in information already parsed
5915 ik->set_should_verify_class(_need_verify);
5916
5917 // Not yet: supers are done below to support the new subtype-checking fields
5918 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5919 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5920 assert(_fac != NULL, "invariant");
5921 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5922
5923 // this transfers ownership of a lot of arrays from
5924 // the parser onto the InstanceKlass*
5925 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5926
5927 // note that is not safe to use the fields in the parser from this point on
5928 assert(NULL == _cp, "invariant");
5929 assert(NULL == _fields, "invariant");
5930 assert(NULL == _methods, "invariant");
5931 assert(NULL == _inner_classes, "invariant");
5932 assert(NULL == _nest_members, "invariant");
5933 assert(NULL == _local_interfaces, "invariant");
5934 assert(NULL == _combined_annotations, "invariant");
5935
5936 if (_has_final_method) {
5937 ik->set_has_final_method();
5938 }
5939
5940 ik->copy_method_ordering(_method_ordering, CHECK);
5941 // The InstanceKlass::_methods_jmethod_ids cache
5942 // is managed on the assumption that the initial cache
5943 // size is equal to the number of methods in the class. If
5944 // that changes, then InstanceKlass::idnum_can_increment()
5945 // has to be changed accordingly.
5946 ik->set_initial_method_idnum(ik->methods()->length());
5947
5948 ik->set_this_class_index(_this_class_index);
5949
5950 if (is_unsafe_anonymous()) {
5951 // _this_class_index is a CONSTANT_Class entry that refers to this
5952 // anonymous class itself. If this class needs to refer to its own methods or
5953 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5954 // _this_class_index. However, because this class is anonymous (it's
5955 // not stored in SystemDictionary), _this_class_index cannot be resolved
5956 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5957 // Therefore, we must eagerly resolve _this_class_index now.
5958 ik->constants()->klass_at_put(_this_class_index, ik);
5959 }
5960
5961 ik->set_minor_version(_minor_version);
5962 ik->set_major_version(_major_version);
5963 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5964 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5965
5966 if (_unsafe_anonymous_host != NULL) {
5967 assert (ik->is_unsafe_anonymous(), "should be the same");
5968 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5969 }
5970
5971 // Set PackageEntry for this_klass
5972 oop cl = ik->class_loader();
5973 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5974 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5975 ik->set_package(cld, CHECK);
5976
5977 const Array<Method*>* const methods = ik->methods();
5978 assert(methods != NULL, "invariant");
5979 const int methods_len = methods->length();
5980
5981 check_methods_for_intrinsics(ik, methods);
5982
5983 // Fill in field values obtained by parse_classfile_attributes
5984 if (_parsed_annotations->has_any_annotations()) {
5985 _parsed_annotations->apply_to(ik);
5986 }
5987
5988 apply_parsed_class_attributes(ik);
5989
5990 // Miranda methods
5991 if ((_num_miranda_methods > 0) ||
5992 // if this class introduced new miranda methods or
5993 (_super_klass != NULL && _super_klass->has_miranda_methods())
5994 // super class exists and this class inherited miranda methods
5995 ) {
5996 ik->set_has_miranda_methods(); // then set a flag
5997 }
5998
5999 // Fill in information needed to compute superclasses.
6000 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
6001 ik->set_transitive_interfaces(_transitive_interfaces);
6002 _transitive_interfaces = NULL;
6003
6004 // Initialize itable offset tables
6005 klassItable::setup_itable_offset_table(ik);
6006
6007 // Compute transitive closure of interfaces this class implements
6008 // Do final class setup
6009 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
6010 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
6011 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
6012 }
6013
6014 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
6015 set_precomputed_flags(ik, CHECK);
6016
6017 // check if this class can access its super class
6018 check_super_class_access(ik, CHECK);
6019
6020 // check if this class can access its superinterfaces
6021 check_super_interface_access(ik, CHECK);
6022
6023 // check if this class overrides any final method
6024 check_final_method_override(ik, CHECK);
6025
6026 // reject static interface methods prior to Java 8
6027 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
6028 check_illegal_static_method(ik, CHECK);
6029 }
6030
6031 // Obtain this_klass' module entry
6032 ModuleEntry* module_entry = ik->module();
6033 assert(module_entry != NULL, "module_entry should always be set");
6034
6035 // Obtain java.lang.Module
6036 Handle module_handle(THREAD, module_entry->module());
6037
6038 // Allocate mirror and initialize static fields
6039 // The create_mirror() call will also call compute_modifiers()
6040 java_lang_Class::create_mirror(ik,
6041 Handle(THREAD, _loader_data->class_loader()),
6042 module_handle,
6043 _protection_domain,
6044 CHECK);
6045
6046 assert(_all_mirandas != NULL, "invariant");
6047
6048 // Generate any default methods - default methods are public interface methods
6049 // that have a default implementation. This is new with Java 8.
6050 if (_has_nonstatic_concrete_methods) {
6051 DefaultMethods::generate_default_methods(ik,
6052 _all_mirandas,
6053 CHECK);
6054 }
6055
6056 if (is_value_type()) {
6057 ValueKlass* vk = ValueKlass::cast(ik);
6058 vk->initialize_calling_convention();
6059 }
6060
6061 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
6062 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
6063 !module_entry->has_default_read_edges()) {
6064 if (!module_entry->set_has_default_read_edges()) {
6065 // We won a potential race
6066 JvmtiExport::add_default_read_edges(module_handle, THREAD);
6067 }
6068 }
6069
6070 int nfields = ik->java_fields_count();
6071 if (ik->is_value()) nfields++;
6072 for(int i = 0; i < nfields; i++) {
6073 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
6074 Klass* klass = SystemDictionary::resolve_or_fail(ik->field_signature(i),
6075 Handle(THREAD, ik->class_loader()),
6076 Handle(THREAD, ik->protection_domain()), true, CHECK);
6077 assert(klass != NULL, "Sanity check");
6078 assert(klass->access_flags().is_value_type(), "Value type expected");
6079 ik->set_value_field_klass(i, klass);
6080 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
6081 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
6082 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
6083 }
6084 }
6085
6086 // Update the loader_data graph.
6087 record_defined_class_dependencies(ik, CHECK);
6088
6089 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
6090
6091 if (!is_internal()) {
6092 if (log_is_enabled(Info, class, load)) {
6093 ResourceMark rm;
6094 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6095 ik->print_class_load_logging(_loader_data, module_name, _stream);
6096 }
6097
6098 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6099 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
6100 log_is_enabled(Info, class, preview)) {
6101 ResourceMark rm;
6102 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
6103 }
6104
6105 if (log_is_enabled(Debug, class, resolve)) {
6106 ResourceMark rm;
6107 // print out the superclass.
6108 const char * from = ik->external_name();
6109 if (ik->java_super() != NULL) {
6110 log_debug(class, resolve)("%s %s (super)",
6111 from,
6112 ik->java_super()->external_name());
6113 }
6114 // print out each of the interface classes referred to by this class.
6115 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6116 if (local_interfaces != NULL) {
6117 const int length = local_interfaces->length();
6118 for (int i = 0; i < length; i++) {
6119 const InstanceKlass* const k = local_interfaces->at(i);
6120 const char * to = k->external_name();
6121 log_debug(class, resolve)("%s %s (interface)", from, to);
6122 }
6123 }
6124 }
6125 }
6126
6127 JFR_ONLY(INIT_ID(ik);)
6128
6129 // If we reach here, all is well.
6130 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6131 // in order for it to not be destroyed in the ClassFileParser destructor.
6132 set_klass_to_deallocate(NULL);
6133
6134 // it's official
6135 set_klass(ik);
6136
6137 debug_only(ik->verify();)
6138 }
6139
6140 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6141 // package by prepending its host class's package name to its class name and setting
6142 // its _class_name field.
6143 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6144 ResourceMark rm(THREAD);
6145 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6146 "Unsafe anonymous class should not be in a package");
6147 const char* host_pkg_name =
6148 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6149
6150 if (host_pkg_name != NULL) {
6151 size_t host_pkg_len = strlen(host_pkg_name);
6152 int class_name_len = _class_name->utf8_length();
6153 char* new_anon_name =
6154 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
6155 // Copy host package name and trailing /.
6156 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
6157 new_anon_name[host_pkg_len] = '/';
6158 // Append unsafe anonymous class name. The unsafe anonymous class name can contain odd
6159 // characters. So, do a strncpy instead of using sprintf("%s...").
6160 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
6161
6162 // Create a symbol and update the anonymous class name.
6163 _class_name = SymbolTable::new_symbol(new_anon_name,
6164 (int)host_pkg_len + 1 + class_name_len,
6165 CHECK);
6166 }
6167 }
6168
6169 // If the host class and the anonymous class are in the same package then do
6170 // nothing. If the anonymous class is in the unnamed package then move it to its
6171 // host's package. If the classes are in different packages then throw an IAE
6172 // exception.
6173 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6174 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6175
6176 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
6177 _class_name->utf8_length(), '/');
6178 if (anon_last_slash == NULL) { // Unnamed package
6179 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6180 } else {
6181 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6182 ResourceMark rm(THREAD);
6183 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6184 err_msg("Host class %s and anonymous class %s are in different packages",
6185 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6186 }
6187 }
6188 }
6189
6190 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6191 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6192 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6193 bool need_verify =
6194 // verifyAll
6195 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6196 // verifyRemote
6197 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6198 return !need_verify;
6199 }
6200
6201 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6202 Symbol* name,
6203 ClassLoaderData* loader_data,
6204 Handle protection_domain,
6205 const InstanceKlass* unsafe_anonymous_host,
6206 GrowableArray<Handle>* cp_patches,
6207 Publicity pub_level,
6208 TRAPS) :
6209 _stream(stream),
6210 _requested_name(name),
6211 _loader_data(loader_data),
6212 _unsafe_anonymous_host(unsafe_anonymous_host),
6213 _cp_patches(cp_patches),
6214 _num_patched_klasses(0),
6215 _max_num_patched_klasses(0),
6216 _orig_cp_size(0),
6217 _first_patched_klass_resolved_index(0),
6218 _super_klass(),
6219 _cp(NULL),
6220 _fields(NULL),
6221 _methods(NULL),
6222 _inner_classes(NULL),
6223 _nest_members(NULL),
6224 _nest_host(0),
6225 _value_types(NULL),
6226 _local_interfaces(NULL),
6227 _transitive_interfaces(NULL),
6228 _combined_annotations(NULL),
6229 _annotations(NULL),
6230 _type_annotations(NULL),
6231 _fields_annotations(NULL),
6232 _fields_type_annotations(NULL),
6233 _klass(NULL),
6234 _klass_to_deallocate(NULL),
6235 _parsed_annotations(NULL),
6236 _fac(NULL),
6237 _field_info(NULL),
6238 _method_ordering(NULL),
6239 _all_mirandas(NULL),
6240 _vtable_size(0),
6241 _itable_size(0),
6242 _num_miranda_methods(0),
6243 _rt(REF_NONE),
6244 _protection_domain(protection_domain),
6245 _access_flags(),
6246 _pub_level(pub_level),
6247 _bad_constant_seen(0),
6248 _synthetic_flag(false),
6249 _sde_length(false),
6250 _sde_buffer(NULL),
6251 _sourcefile_index(0),
6252 _generic_signature_index(0),
6253 _major_version(0),
6254 _minor_version(0),
6255 _this_class_index(0),
6256 _super_class_index(0),
6257 _itfs_len(0),
6258 _java_fields_count(0),
6259 _need_verify(false),
6260 _relax_verify(false),
6261 _has_nonstatic_concrete_methods(false),
6262 _declares_nonstatic_concrete_methods(false),
6263 _has_final_method(false),
6264 _has_flattenable_fields(false),
6265 _has_finalizer(false),
6266 _has_empty_finalizer(false),
6267 _has_vanilla_constructor(false),
6268 _max_bootstrap_specifier_index(-1) {
6269
6270 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6271
6272 assert(THREAD->is_Java_thread(), "invariant");
6273 assert(_loader_data != NULL, "invariant");
6274 assert(stream != NULL, "invariant");
6275 assert(_stream != NULL, "invariant");
6276 assert(_stream->buffer() == _stream->current(), "invariant");
6277 assert(_class_name != NULL, "invariant");
6278 assert(0 == _access_flags.as_int(), "invariant");
6279
6280 // Figure out whether we can skip format checking (matching classic VM behavior)
6281 if (DumpSharedSpaces) {
6282 // verify == true means it's a 'remote' class (i.e., non-boot class)
6283 // Verification decision is based on BytecodeVerificationRemote flag
6284 // for those classes.
6285 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6286 BytecodeVerificationLocal;
6287 }
6288 else {
6289 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6290 stream->need_verify());
6291 }
6292 if (_cp_patches != NULL) {
6293 int len = _cp_patches->length();
6294 for (int i=0; i<len; i++) {
6295 if (has_cp_patch_at(i)) {
6296 Handle patch = cp_patch_at(i);
6297 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6298 // We need to append the names of the patched classes to the end of the constant pool,
6299 // because a patched class may have a Utf8 name that's not already included in the
6300 // original constant pool. These class names are used when patch_constant_pool()
6301 // calls patch_class().
6302 //
6303 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6304 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6305 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6306 _max_num_patched_klasses++;
6307 }
6308 }
6309 }
6310 }
6311
6312 // synch back verification state to stream
6313 stream->set_verify(_need_verify);
6314
6315 // Check if verification needs to be relaxed for this class file
6316 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6317 _relax_verify = relax_format_check_for(_loader_data);
6318
6319 parse_stream(stream, CHECK);
6320
6321 post_process_parsed_stream(stream, _cp, CHECK);
6322 }
6323
6324 void ClassFileParser::clear_class_metadata() {
6325 // metadata created before the instance klass is created. Must be
6326 // deallocated if classfile parsing returns an error.
6327 _cp = NULL;
6328 _fields = NULL;
6329 _methods = NULL;
6330 _inner_classes = NULL;
6331 _nest_members = NULL;
6332 _local_interfaces = NULL;
6333 _combined_annotations = NULL;
6334 _annotations = _type_annotations = NULL;
6335 _fields_annotations = _fields_type_annotations = NULL;
6336 }
6337
6338 // Destructor to clean up
6339 ClassFileParser::~ClassFileParser() {
6340 if (_cp != NULL) {
6341 MetadataFactory::free_metadata(_loader_data, _cp);
6342 }
6343 if (_fields != NULL) {
6344 MetadataFactory::free_array<u2>(_loader_data, _fields);
6345 }
6346
6347 if (_methods != NULL) {
6348 // Free methods
6349 InstanceKlass::deallocate_methods(_loader_data, _methods);
6350 }
6351
6352 // beware of the Universe::empty_blah_array!!
6353 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6354 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6355 }
6356
6357 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6358 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6359 }
6360
6361 // Free interfaces
6362 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6363 _local_interfaces, _transitive_interfaces);
6364
6365 if (_combined_annotations != NULL) {
6366 // After all annotations arrays have been created, they are installed into the
6367 // Annotations object that will be assigned to the InstanceKlass being created.
6368
6369 // Deallocate the Annotations object and the installed annotations arrays.
6370 _combined_annotations->deallocate_contents(_loader_data);
6371
6372 // If the _combined_annotations pointer is non-NULL,
6373 // then the other annotations fields should have been cleared.
6374 assert(_annotations == NULL, "Should have been cleared");
6375 assert(_type_annotations == NULL, "Should have been cleared");
6376 assert(_fields_annotations == NULL, "Should have been cleared");
6377 assert(_fields_type_annotations == NULL, "Should have been cleared");
6378 } else {
6379 // If the annotations arrays were not installed into the Annotations object,
6380 // then they have to be deallocated explicitly.
6381 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6382 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6383 Annotations::free_contents(_loader_data, _fields_annotations);
6384 Annotations::free_contents(_loader_data, _fields_type_annotations);
6385 }
6386
6387 clear_class_metadata();
6388 _transitive_interfaces = NULL;
6389
6390 // deallocate the klass if already created. Don't directly deallocate, but add
6391 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6392 // at a safepoint.
6393 if (_klass_to_deallocate != NULL) {
6394 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6395 }
6396 }
6397
6398 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6399 TRAPS) {
6400
6401 assert(stream != NULL, "invariant");
6402 assert(_class_name != NULL, "invariant");
6403
6404 // BEGIN STREAM PARSING
6405 stream->guarantee_more(8, CHECK); // magic, major, minor
6406 // Magic value
6407 const u4 magic = stream->get_u4_fast();
6408 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6409 "Incompatible magic value %u in class file %s",
6410 magic, CHECK);
6411
6412 // Version numbers
6413 _minor_version = stream->get_u2_fast();
6414 _major_version = stream->get_u2_fast();
6415
6416 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6417 ResourceMark rm;
6418 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6419 _major_version, _minor_version, _class_name->as_C_string());
6420 Exceptions::fthrow(
6421 THREAD_AND_LOCATION,
6422 vmSymbols::java_lang_UnsupportedClassVersionError(),
6423 "Unsupported major.minor version for dump time %u.%u",
6424 _major_version,
6425 _minor_version);
6426 }
6427
6428 // Check version numbers - we check this even with verifier off
6429 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6430
6431 stream->guarantee_more(3, CHECK); // length, first cp tag
6432 u2 cp_size = stream->get_u2_fast();
6433
6434 guarantee_property(
6435 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6436 cp_size, CHECK);
6437
6438 _orig_cp_size = cp_size;
6439 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6440 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6441 }
6442 cp_size += _max_num_patched_klasses;
6443
6444 _cp = ConstantPool::allocate(_loader_data,
6445 cp_size,
6446 CHECK);
6447
6448 ConstantPool* const cp = _cp;
6449
6450 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6451
6452 assert(cp_size == (const u2)cp->length(), "invariant");
6453
6454 // ACCESS FLAGS
6455 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6456
6457 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6458 // JVM_ACC_MODULE is defined in JDK-9 and later.
6459 if (_major_version >= JAVA_9_VERSION) {
6460 recognized_modifiers |= JVM_ACC_MODULE;
6461 }
6462 // JVM_ACC_VALUE is defined for class file version 55 and later
6463 if (supports_value_types()) {
6464 recognized_modifiers |= JVM_ACC_VALUE;
6465 }
6466
6467 // Access flags
6468 jint flags = stream->get_u2_fast() & recognized_modifiers;
6469
6470 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6471 // Set abstract bit for old class files for backward compatibility
6472 flags |= JVM_ACC_ABSTRACT;
6473 }
6474
6475 verify_legal_class_modifiers(flags, CHECK);
6476
6477 short bad_constant = class_bad_constant_seen();
6478 if (bad_constant != 0) {
6479 // Do not throw CFE until after the access_flags are checked because if
6480 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6481 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6482 }
6483
6484 _access_flags.set_flags(flags);
6485
6486 // This class and superclass
6487 _this_class_index = stream->get_u2_fast();
6488 check_property(
6489 valid_cp_range(_this_class_index, cp_size) &&
6490 cp->tag_at(_this_class_index).is_unresolved_klass(),
6491 "Invalid this class index %u in constant pool in class file %s",
6492 _this_class_index, CHECK);
6493
6494 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6495 assert(class_name_in_cp != NULL, "class_name can't be null");
6496
6497 // Update _class_name which could be null previously
6498 // to reflect the name in the constant pool
6499 _class_name = class_name_in_cp;
6500
6501 // Don't need to check whether this class name is legal or not.
6502 // It has been checked when constant pool is parsed.
6503 // However, make sure it is not an array type.
6504 if (_need_verify) {
6505 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6506 "Bad class name in class file %s",
6507 CHECK);
6508 }
6509
6510 // Checks if name in class file matches requested name
6511 if (_requested_name != NULL && _requested_name != _class_name) {
6512 ResourceMark rm(THREAD);
6513 Exceptions::fthrow(
6514 THREAD_AND_LOCATION,
6515 vmSymbols::java_lang_NoClassDefFoundError(),
6516 "%s (wrong name: %s)",
6517 _class_name->as_C_string(),
6518 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6519 );
6520 return;
6521 }
6522
6523 // if this is an anonymous class fix up its name if it's in the unnamed
6524 // package. Otherwise, throw IAE if it is in a different package than
6525 // its host class.
6526 if (_unsafe_anonymous_host != NULL) {
6527 fix_unsafe_anonymous_class_name(CHECK);
6528 }
6529
6530 // Verification prevents us from creating names with dots in them, this
6531 // asserts that that's the case.
6532 assert(is_internal_format(_class_name), "external class name format used internally");
6533
6534 if (!is_internal()) {
6535 LogTarget(Debug, class, preorder) lt;
6536 if (lt.is_enabled()){
6537 ResourceMark rm(THREAD);
6538 LogStream ls(lt);
6539 ls.print("%s", _class_name->as_klass_external_name());
6540 if (stream->source() != NULL) {
6541 ls.print(" source: %s", stream->source());
6542 }
6543 ls.cr();
6544 }
6545
6546 #if INCLUDE_CDS
6547 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6548 if (!ClassLoader::has_jrt_entry()) {
6549 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6550 DumpLoadedClassList = NULL;
6551 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6552 _unsafe_anonymous_host == NULL) {
6553 // Only dump the classes that can be stored into CDS archive.
6554 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6555 oop class_loader = _loader_data->class_loader();
6556 ResourceMark rm(THREAD);
6557 bool skip = false;
6558 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6559 // For the boot and platform class loaders, skip classes that are not found in the
6560 // java runtime image, such as those found in the --patch-module entries.
6561 // These classes can't be loaded from the archive during runtime.
6562 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6563 skip = true;
6564 }
6565
6566 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6567 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6568 // as they can be loaded from the archive during runtime.
6569 skip = false;
6570 }
6571 }
6572 if (skip) {
6573 tty->print_cr("skip writing class %s from source %s to classlist file",
6574 _class_name->as_C_string(), stream->source());
6575 } else {
6576 classlist_file->print_cr("%s", _class_name->as_C_string());
6577 classlist_file->flush();
6578 }
6579 }
6580 }
6581 #endif
6582 }
6583
6584 // SUPERKLASS
6585 _super_class_index = stream->get_u2_fast();
6586 _super_klass = parse_super_class(cp,
6587 _super_class_index,
6588 _need_verify,
6589 CHECK);
6590
6591 // Interfaces
6592 _itfs_len = stream->get_u2_fast();
6593 parse_interfaces(stream,
6594 _itfs_len,
6595 cp,
6596 &_has_nonstatic_concrete_methods,
6597 CHECK);
6598
6599 assert(_local_interfaces != NULL, "invariant");
6600
6601 // Fields (offsets are filled in later)
6602 _fac = new FieldAllocationCount();
6603 parse_fields(stream,
6604 _access_flags.is_interface(),
6605 _access_flags.is_value_type(),
6606 _fac,
6607 cp,
6608 cp_size,
6609 &_java_fields_count,
6610 CHECK);
6611
6612 assert(_fields != NULL, "invariant");
6613
6614 // Methods
6615 AccessFlags promoted_flags;
6616 parse_methods(stream,
6617 _access_flags.is_interface(),
6618 _access_flags.is_value_type(),
6619 &promoted_flags,
6620 &_has_final_method,
6621 &_declares_nonstatic_concrete_methods,
6622 CHECK);
6623
6624 assert(_methods != NULL, "invariant");
6625
6626 // promote flags from parse_methods() to the klass' flags
6627 _access_flags.add_promoted_flags(promoted_flags.as_int());
6628
6629 if (_declares_nonstatic_concrete_methods) {
6630 _has_nonstatic_concrete_methods = true;
6631 }
6632
6633 // Additional attributes/annotations
6634 _parsed_annotations = new ClassAnnotationCollector();
6635 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6636
6637 assert(_inner_classes != NULL, "invariant");
6638
6639 // Finalize the Annotations metadata object,
6640 // now that all annotation arrays have been created.
6641 create_combined_annotations(CHECK);
6642
6643 // Make sure this is the end of class file stream
6644 guarantee_property(stream->at_eos(),
6645 "Extra bytes at the end of class file %s",
6646 CHECK);
6647
6648 // all bytes in stream read and parsed
6649 }
6650
6651 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6652 ConstantPool* cp,
6653 TRAPS) {
6654 assert(stream != NULL, "invariant");
6655 assert(stream->at_eos(), "invariant");
6656 assert(cp != NULL, "invariant");
6657 assert(_loader_data != NULL, "invariant");
6658
6659 if (_class_name == vmSymbols::java_lang_Object()) {
6660 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6661 "java.lang.Object cannot implement an interface in class file %s",
6662 CHECK);
6663 }
6664 // We check super class after class file is parsed and format is checked
6665 if (_super_class_index > 0 && NULL ==_super_klass) {
6666 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6667 if (_access_flags.is_interface()) {
6668 // Before attempting to resolve the superclass, check for class format
6669 // errors not checked yet.
6670 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6671 "Interfaces must have java.lang.Object as superclass in class file %s",
6672 CHECK);
6673 }
6674 Handle loader(THREAD, _loader_data->class_loader());
6675 _super_klass = (const InstanceKlass*)
6676 SystemDictionary::resolve_super_or_fail(_class_name,
6677 super_class_name,
6678 loader,
6679 _protection_domain,
6680 true,
6681 CHECK);
6682 }
6683
6684 if (_super_klass != NULL) {
6685 if (_super_klass->has_nonstatic_concrete_methods()) {
6686 _has_nonstatic_concrete_methods = true;
6687 }
6688
6689 if (_super_klass->is_interface()) {
6690 ResourceMark rm(THREAD);
6691 Exceptions::fthrow(
6692 THREAD_AND_LOCATION,
6693 vmSymbols::java_lang_IncompatibleClassChangeError(),
6694 "class %s has interface %s as super class",
6695 _class_name->as_klass_external_name(),
6696 _super_klass->external_name()
6697 );
6698 return;
6699 }
6700
6701 // For a value class, only java/lang/Object is an acceptable super class
6702 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6703 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6704 "Value type must have java.lang.Object as superclass in class file %s",
6705 CHECK);
6706 }
6707
6708 // Make sure super class is not final
6709 if (_super_klass->is_final()) {
6710 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6711 }
6712 }
6713
6714 // Compute the transitive list of all unique interfaces implemented by this class
6715 _transitive_interfaces =
6716 compute_transitive_interfaces(_super_klass,
6717 _local_interfaces,
6718 _loader_data,
6719 CHECK);
6720
6721 assert(_transitive_interfaces != NULL, "invariant");
6722
6723 // sort methods
6724 _method_ordering = sort_methods(_methods);
6725
6726 _all_mirandas = new GrowableArray<Method*>(20);
6727
6728 Handle loader(THREAD, _loader_data->class_loader());
6729 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6730 &_num_miranda_methods,
6731 _all_mirandas,
6732 _super_klass,
6733 _methods,
6734 _access_flags,
6735 _major_version,
6736 loader,
6737 _class_name,
6738 _local_interfaces,
6739 CHECK);
6740
6741 // Size of Java itable (in words)
6742 _itable_size = _access_flags.is_interface() ? 0 :
6743 klassItable::compute_itable_size(_transitive_interfaces);
6744
6745 assert(_fac != NULL, "invariant");
6746 assert(_parsed_annotations != NULL, "invariant");
6747
6748 _field_info = new FieldLayoutInfo();
6749 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6750
6751 // Compute reference typ
6752 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6753
6754 }
6755
6756 void ClassFileParser::set_klass(InstanceKlass* klass) {
6757
6758 #ifdef ASSERT
6759 if (klass != NULL) {
6760 assert(NULL == _klass, "leaking?");
6761 }
6762 #endif
6763
6764 _klass = klass;
6765 }
6766
6767 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6768
6769 #ifdef ASSERT
6770 if (klass != NULL) {
6771 assert(NULL == _klass_to_deallocate, "leaking?");
6772 }
6773 #endif
6774
6775 _klass_to_deallocate = klass;
6776 }
6777
6778 // Caller responsible for ResourceMark
6779 // clone stream with rewound position
6780 const ClassFileStream* ClassFileParser::clone_stream() const {
6781 assert(_stream != NULL, "invariant");
6782
6783 return _stream->clone();
6784 }
6785
6786 // ----------------------------------------------------------------------------
6787 // debugging
6788
6789 #ifdef ASSERT
6790
6791 // return true if class_name contains no '.' (internal format is '/')
6792 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6793 if (class_name != NULL) {
6794 ResourceMark rm;
6795 char* name = class_name->as_C_string();
6796 return strchr(name, '.') == NULL;
6797 } else {
6798 return true;
6799 }
6800 }
6801
6802 #endif