1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include <classfile/fieldLayoutBuilder.hpp>
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/dictionary.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldStreams.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceMirrorKlass.hpp"
54 #include "oops/klass.inline.hpp"
55 #include "oops/klassVtable.hpp"
56 #include "oops/metadata.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/symbol.hpp"
60 #include "oops/valueKlass.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/fieldDescriptor.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/safepointVerifiers.hpp"
71 #include "runtime/signature.hpp"
72 #include "runtime/timer.hpp"
73 #include "services/classLoadingService.hpp"
74 #include "services/threadService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/bitMap.inline.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/exceptions.hpp"
79 #include "utilities/globalDefinitions.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/resourceHash.hpp"
84 #include "utilities/utf8.hpp"
85
86 #if INCLUDE_CDS
87 #include "classfile/systemDictionaryShared.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/support/jfrTraceIdExtension.hpp"
91 #endif
92
93 // We generally try to create the oops directly when parsing, rather than
94 // allocating temporary data structures and copying the bytes twice. A
95 // temporary area is only needed when parsing utf8 entries in the constant
96 // pool and when parsing line number tables.
97
98 // We add assert in debug mode when class format is not checked.
99
100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
101 #define JAVA_MIN_SUPPORTED_VERSION 45
102 #define JAVA_PREVIEW_MINOR_VERSION 65535
103
104 // Used for two backward compatibility reasons:
105 // - to check for new additions to the class file format in JDK1.5
106 // - to check for bug fixes in the format checker in JDK1.5
107 #define JAVA_1_5_VERSION 49
108
109 // Used for backward compatibility reasons:
110 // - to check for javac bug fixes that happened after 1.5
111 // - also used as the max version when running in jdk6
112 #define JAVA_6_VERSION 50
113
114 // Used for backward compatibility reasons:
115 // - to disallow argument and require ACC_STATIC for <clinit> methods
116 #define JAVA_7_VERSION 51
117
118 // Extension method support.
119 #define JAVA_8_VERSION 52
120
121 #define JAVA_9_VERSION 53
122
123 #define JAVA_10_VERSION 54
124
125 #define JAVA_11_VERSION 55
126
127 #define JAVA_12_VERSION 56
128
129 #define JAVA_13_VERSION 57
130
131 #define JAVA_14_VERSION 58
132
133 #define CONSTANT_CLASS_DESCRIPTORS 58
134
135 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
136 assert((bad_constant == JVM_CONSTANT_Module ||
137 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
138 "Unexpected bad constant pool entry");
139 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
140 }
141
142 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
143 ConstantPool* cp,
144 const int length,
145 TRAPS) {
146 assert(stream != NULL, "invariant");
147 assert(cp != NULL, "invariant");
148
149 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
150 // this function (_current can be allocated in a register, with scalar
151 // replacement of aggregates). The _current pointer is copied back to
152 // stream() when this function returns. DON'T call another method within
153 // this method that uses stream().
154 const ClassFileStream cfs1 = *stream;
155 const ClassFileStream* const cfs = &cfs1;
156
157 assert(cfs->allocated_on_stack(), "should be local");
158 debug_only(const u1* const old_current = stream->current();)
159
160 // Used for batching symbol allocations.
161 const char* names[SymbolTable::symbol_alloc_batch_size];
162 int lengths[SymbolTable::symbol_alloc_batch_size];
163 int indices[SymbolTable::symbol_alloc_batch_size];
164 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
165 int names_count = 0;
166
167 // parsing Index 0 is unused
168 for (int index = 1; index < length; index++) {
169 // Each of the following case guarantees one more byte in the stream
170 // for the following tag or the access_flags following constant pool,
171 // so we don't need bounds-check for reading tag.
172 const u1 tag = cfs->get_u1_fast();
173 switch (tag) {
174 case JVM_CONSTANT_Class: {
175 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
176 const u2 name_index = cfs->get_u2_fast();
177 cp->klass_index_at_put(index, name_index);
178 break;
179 }
180 case JVM_CONSTANT_Fieldref: {
181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
182 const u2 class_index = cfs->get_u2_fast();
183 const u2 name_and_type_index = cfs->get_u2_fast();
184 cp->field_at_put(index, class_index, name_and_type_index);
185 break;
186 }
187 case JVM_CONSTANT_Methodref: {
188 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
189 const u2 class_index = cfs->get_u2_fast();
190 const u2 name_and_type_index = cfs->get_u2_fast();
191 cp->method_at_put(index, class_index, name_and_type_index);
192 break;
193 }
194 case JVM_CONSTANT_InterfaceMethodref: {
195 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
196 const u2 class_index = cfs->get_u2_fast();
197 const u2 name_and_type_index = cfs->get_u2_fast();
198 cp->interface_method_at_put(index, class_index, name_and_type_index);
199 break;
200 }
201 case JVM_CONSTANT_String : {
202 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
203 const u2 string_index = cfs->get_u2_fast();
204 cp->string_index_at_put(index, string_index);
205 break;
206 }
207 case JVM_CONSTANT_MethodHandle :
208 case JVM_CONSTANT_MethodType: {
209 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
210 classfile_parse_error(
211 "Class file version does not support constant tag %u in class file %s",
212 tag, CHECK);
213 }
214 if (tag == JVM_CONSTANT_MethodHandle) {
215 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
216 const u1 ref_kind = cfs->get_u1_fast();
217 const u2 method_index = cfs->get_u2_fast();
218 cp->method_handle_index_at_put(index, ref_kind, method_index);
219 }
220 else if (tag == JVM_CONSTANT_MethodType) {
221 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
222 const u2 signature_index = cfs->get_u2_fast();
223 cp->method_type_index_at_put(index, signature_index);
224 }
225 else {
226 ShouldNotReachHere();
227 }
228 break;
229 }
230 case JVM_CONSTANT_Dynamic : {
231 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
232 classfile_parse_error(
233 "Class file version does not support constant tag %u in class file %s",
234 tag, CHECK);
235 }
236 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
237 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
238 const u2 name_and_type_index = cfs->get_u2_fast();
239 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
240 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
241 }
242 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
243 break;
244 }
245 case JVM_CONSTANT_InvokeDynamic : {
246 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
247 classfile_parse_error(
248 "Class file version does not support constant tag %u in class file %s",
249 tag, CHECK);
250 }
251 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
252 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
253 const u2 name_and_type_index = cfs->get_u2_fast();
254 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
255 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
256 }
257 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
258 break;
259 }
260 case JVM_CONSTANT_Integer: {
261 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
262 const u4 bytes = cfs->get_u4_fast();
263 cp->int_at_put(index, (jint)bytes);
264 break;
265 }
266 case JVM_CONSTANT_Float: {
267 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
268 const u4 bytes = cfs->get_u4_fast();
269 cp->float_at_put(index, *(jfloat*)&bytes);
270 break;
271 }
272 case JVM_CONSTANT_Long: {
273 // A mangled type might cause you to overrun allocated memory
274 guarantee_property(index + 1 < length,
275 "Invalid constant pool entry %u in class file %s",
276 index,
277 CHECK);
278 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
279 const u8 bytes = cfs->get_u8_fast();
280 cp->long_at_put(index, bytes);
281 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
282 break;
283 }
284 case JVM_CONSTANT_Double: {
285 // A mangled type might cause you to overrun allocated memory
286 guarantee_property(index+1 < length,
287 "Invalid constant pool entry %u in class file %s",
288 index,
289 CHECK);
290 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
291 const u8 bytes = cfs->get_u8_fast();
292 cp->double_at_put(index, *(jdouble*)&bytes);
293 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
294 break;
295 }
296 case JVM_CONSTANT_NameAndType: {
297 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
298 const u2 name_index = cfs->get_u2_fast();
299 const u2 signature_index = cfs->get_u2_fast();
300 cp->name_and_type_at_put(index, name_index, signature_index);
301 break;
302 }
303 case JVM_CONSTANT_Utf8 : {
304 cfs->guarantee_more(2, CHECK); // utf8_length
305 u2 utf8_length = cfs->get_u2_fast();
306 const u1* utf8_buffer = cfs->current();
307 assert(utf8_buffer != NULL, "null utf8 buffer");
308 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
309 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
310 cfs->skip_u1_fast(utf8_length);
311
312 // Before storing the symbol, make sure it's legal
313 if (_need_verify) {
314 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
315 }
316
317 if (has_cp_patch_at(index)) {
318 Handle patch = clear_cp_patch_at(index);
319 guarantee_property(java_lang_String::is_instance(patch()),
320 "Illegal utf8 patch at %d in class file %s",
321 index,
322 CHECK);
323 const char* const str = java_lang_String::as_utf8_string(patch());
324 // (could use java_lang_String::as_symbol instead, but might as well batch them)
325 utf8_buffer = (const u1*) str;
326 utf8_length = (u2) strlen(str);
327 }
328
329 unsigned int hash;
330 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
331 utf8_length,
332 hash);
333 if (result == NULL) {
334 names[names_count] = (const char*)utf8_buffer;
335 lengths[names_count] = utf8_length;
336 indices[names_count] = index;
337 hashValues[names_count++] = hash;
338 if (names_count == SymbolTable::symbol_alloc_batch_size) {
339 SymbolTable::new_symbols(_loader_data,
340 cp,
341 names_count,
342 names,
343 lengths,
344 indices,
345 hashValues);
346 names_count = 0;
347 }
348 } else {
349 cp->symbol_at_put(index, result);
350 }
351 break;
352 }
353 case JVM_CONSTANT_Module:
354 case JVM_CONSTANT_Package: {
355 // Record that an error occurred in these two cases but keep parsing so
356 // that ACC_Module can be checked for in the access_flags. Need to
357 // throw NoClassDefFoundError in that case.
358 if (_major_version >= JAVA_9_VERSION) {
359 cfs->guarantee_more(3, CHECK);
360 cfs->get_u2_fast();
361 set_class_bad_constant_seen(tag);
362 break;
363 }
364 }
365 default: {
366 classfile_parse_error("Unknown constant tag %u in class file %s",
367 tag,
368 CHECK);
369 break;
370 }
371 } // end of switch(tag)
372 } // end of for
373
374 // Allocate the remaining symbols
375 if (names_count > 0) {
376 SymbolTable::new_symbols(_loader_data,
377 cp,
378 names_count,
379 names,
380 lengths,
381 indices,
382 hashValues);
383 }
384
385 // Copy _current pointer of local copy back to stream.
386 assert(stream->current() == old_current, "non-exclusive use of stream");
387 stream->set_current(cfs1.current());
388
389 }
390
391 static inline bool valid_cp_range(int index, int length) {
392 return (index > 0 && index < length);
393 }
394
395 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
396 assert(cp != NULL, "invariant");
397 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
398 return cp->symbol_at(index);
399 }
400 return NULL;
401 }
402
403 #ifdef ASSERT
404 PRAGMA_DIAG_PUSH
405 PRAGMA_FORMAT_NONLITERAL_IGNORED
406 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
407 ResourceMark rm(THREAD);
408 fatal(msg, _class_name->as_C_string());
409 }
410
411 void ClassFileParser::report_assert_property_failure(const char* msg,
412 int index,
413 TRAPS) const {
414 ResourceMark rm(THREAD);
415 fatal(msg, index, _class_name->as_C_string());
416 }
417 PRAGMA_DIAG_POP
418 #endif
419
420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
421 ConstantPool* const cp,
422 const int length,
423 TRAPS) {
424 assert(cp != NULL, "invariant");
425 assert(stream != NULL, "invariant");
426
427 // parsing constant pool entries
428 parse_constant_pool_entries(stream, cp, length, CHECK);
429 if (class_bad_constant_seen() != 0) {
430 // a bad CP entry has been detected previously so stop parsing and just return.
431 return;
432 }
433
434 int index = 1; // declared outside of loops for portability
435 int num_klasses = 0;
436
437 // first verification pass - validate cross references
438 // and fixup class and string constants
439 for (index = 1; index < length; index++) { // Index 0 is unused
440 const jbyte tag = cp->tag_at(index).value();
441 switch (tag) {
442 case JVM_CONSTANT_Class: {
443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
444 break;
445 }
446 case JVM_CONSTANT_Fieldref:
447 // fall through
448 case JVM_CONSTANT_Methodref:
449 // fall through
450 case JVM_CONSTANT_InterfaceMethodref: {
451 if (!_need_verify) break;
452 const int klass_ref_index = cp->klass_ref_index_at(index);
453 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
454 check_property(valid_klass_reference_at(klass_ref_index),
455 "Invalid constant pool index %u in class file %s",
456 klass_ref_index, CHECK);
457 check_property(valid_cp_range(name_and_type_ref_index, length) &&
458 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
459 "Invalid constant pool index %u in class file %s",
460 name_and_type_ref_index, CHECK);
461 break;
462 }
463 case JVM_CONSTANT_String: {
464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
465 break;
466 }
467 case JVM_CONSTANT_Integer:
468 break;
469 case JVM_CONSTANT_Float:
470 break;
471 case JVM_CONSTANT_Long:
472 case JVM_CONSTANT_Double: {
473 index++;
474 check_property(
475 (index < length && cp->tag_at(index).is_invalid()),
476 "Improper constant pool long/double index %u in class file %s",
477 index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_NameAndType: {
481 if (!_need_verify) break;
482 const int name_ref_index = cp->name_ref_index_at(index);
483 const int signature_ref_index = cp->signature_ref_index_at(index);
484 check_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 check_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 check_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504
505 Symbol* const name = cp->symbol_at(class_index);
506 const unsigned int name_len = name->utf8_length();
507 if (name->is_Q_signature()) {
508 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
509 } else {
510 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
511 }
512 break;
513 }
514 case JVM_CONSTANT_StringIndex: {
515 const int string_index = cp->string_index_at(index);
516 check_property(valid_symbol_at(string_index),
517 "Invalid constant pool index %u in class file %s",
518 string_index, CHECK);
519 Symbol* const sym = cp->symbol_at(string_index);
520 cp->unresolved_string_at_put(index, sym);
521 break;
522 }
523 case JVM_CONSTANT_MethodHandle: {
524 const int ref_index = cp->method_handle_index_at(index);
525 check_property(valid_cp_range(ref_index, length),
526 "Invalid constant pool index %u in class file %s",
527 ref_index, CHECK);
528 const constantTag tag = cp->tag_at(ref_index);
529 const int ref_kind = cp->method_handle_ref_kind_at(index);
530
531 switch (ref_kind) {
532 case JVM_REF_getField:
533 case JVM_REF_getStatic:
534 case JVM_REF_putField:
535 case JVM_REF_putStatic: {
536 check_property(
537 tag.is_field(),
538 "Invalid constant pool index %u in class file %s (not a field)",
539 ref_index, CHECK);
540 break;
541 }
542 case JVM_REF_invokeVirtual:
543 case JVM_REF_newInvokeSpecial: {
544 check_property(
545 tag.is_method(),
546 "Invalid constant pool index %u in class file %s (not a method)",
547 ref_index, CHECK);
548 break;
549 }
550 case JVM_REF_invokeStatic:
551 case JVM_REF_invokeSpecial: {
552 check_property(
553 tag.is_method() ||
554 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
555 "Invalid constant pool index %u in class file %s (not a method)",
556 ref_index, CHECK);
557 break;
558 }
559 case JVM_REF_invokeInterface: {
560 check_property(
561 tag.is_interface_method(),
562 "Invalid constant pool index %u in class file %s (not an interface method)",
563 ref_index, CHECK);
564 break;
565 }
566 default: {
567 classfile_parse_error(
568 "Bad method handle kind at constant pool index %u in class file %s",
569 index, CHECK);
570 }
571 } // switch(refkind)
572 // Keep the ref_index unchanged. It will be indirected at link-time.
573 break;
574 } // case MethodHandle
575 case JVM_CONSTANT_MethodType: {
576 const int ref_index = cp->method_type_index_at(index);
577 check_property(valid_symbol_at(ref_index),
578 "Invalid constant pool index %u in class file %s",
579 ref_index, CHECK);
580 break;
581 }
582 case JVM_CONSTANT_Dynamic: {
583 const int name_and_type_ref_index =
584 cp->bootstrap_name_and_type_ref_index_at(index);
585
586 check_property(valid_cp_range(name_and_type_ref_index, length) &&
587 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
588 "Invalid constant pool index %u in class file %s",
589 name_and_type_ref_index, CHECK);
590 // bootstrap specifier index must be checked later,
591 // when BootstrapMethods attr is available
592
593 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
594 cp->set_has_dynamic_constant();
595 break;
596 }
597 case JVM_CONSTANT_InvokeDynamic: {
598 const int name_and_type_ref_index =
599 cp->bootstrap_name_and_type_ref_index_at(index);
600
601 check_property(valid_cp_range(name_and_type_ref_index, length) &&
602 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
603 "Invalid constant pool index %u in class file %s",
604 name_and_type_ref_index, CHECK);
605 // bootstrap specifier index must be checked later,
606 // when BootstrapMethods attr is available
607 break;
608 }
609 default: {
610 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
611 ShouldNotReachHere();
612 break;
613 }
614 } // switch(tag)
615 } // end of for
616
617 _first_patched_klass_resolved_index = num_klasses;
618 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
619
620 if (_cp_patches != NULL) {
621 // need to treat this_class specially...
622
623 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
624 // for now. These will be replaced with actual names of the patched classes in patch_class().
625 Symbol* s = vmSymbols::star_name();
626 for (int n=_orig_cp_size; n<cp->length(); n++) {
627 cp->symbol_at_put(n, s);
628 }
629
630 int this_class_index;
631 {
632 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
633 const u1* const mark = stream->current();
634 stream->skip_u2_fast(1); // skip flags
635 this_class_index = stream->get_u2_fast();
636 stream->set_current(mark); // revert to mark
637 }
638
639 for (index = 1; index < length; index++) { // Index 0 is unused
640 if (has_cp_patch_at(index)) {
641 guarantee_property(index != this_class_index,
642 "Illegal constant pool patch to self at %d in class file %s",
643 index, CHECK);
644 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
645 }
646 }
647 }
648
649 if (!_need_verify) {
650 return;
651 }
652
653 // second verification pass - checks the strings are of the right format.
654 // but not yet to the other entries
655 for (index = 1; index < length; index++) {
656 const jbyte tag = cp->tag_at(index).value();
657 switch (tag) {
658 case JVM_CONSTANT_UnresolvedClass: {
659 const Symbol* const class_name = cp->klass_name_at(index);
660 // check the name, even if _cp_patches will overwrite it
661 verify_legal_class_name(class_name, CHECK);
662 break;
663 }
664 case JVM_CONSTANT_NameAndType: {
665 if (_need_verify) {
666 const int sig_index = cp->signature_ref_index_at(index);
667 const int name_index = cp->name_ref_index_at(index);
668 const Symbol* const name = cp->symbol_at(name_index);
669 const Symbol* const sig = cp->symbol_at(sig_index);
670 guarantee_property(sig->utf8_length() != 0,
671 "Illegal zero length constant pool entry at %d in class %s",
672 sig_index, CHECK);
673 guarantee_property(name->utf8_length() != 0,
674 "Illegal zero length constant pool entry at %d in class %s",
675 name_index, CHECK);
676
677 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
678 // Format check method name and signature
679 verify_legal_method_name(name, CHECK);
680 verify_legal_method_signature(name, sig, CHECK);
681 } else {
682 // Format check field name and signature
683 verify_legal_field_name(name, CHECK);
684 verify_legal_field_signature(name, sig, CHECK);
685 }
686 }
687 break;
688 }
689 case JVM_CONSTANT_Dynamic: {
690 const int name_and_type_ref_index =
691 cp->name_and_type_ref_index_at(index);
692 // already verified to be utf8
693 const int name_ref_index =
694 cp->name_ref_index_at(name_and_type_ref_index);
695 // already verified to be utf8
696 const int signature_ref_index =
697 cp->signature_ref_index_at(name_and_type_ref_index);
698 const Symbol* const name = cp->symbol_at(name_ref_index);
699 const Symbol* const signature = cp->symbol_at(signature_ref_index);
700 if (_need_verify) {
701 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
702 // Need only to be sure signature is non-zero length and the right type.
703 if (signature->utf8_length() == 0 ||
704 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
705 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
706 }
707 }
708 break;
709 }
710 case JVM_CONSTANT_InvokeDynamic:
711 case JVM_CONSTANT_Fieldref:
712 case JVM_CONSTANT_Methodref:
713 case JVM_CONSTANT_InterfaceMethodref: {
714 const int name_and_type_ref_index =
715 cp->name_and_type_ref_index_at(index);
716 // already verified to be utf8
717 const int name_ref_index =
718 cp->name_ref_index_at(name_and_type_ref_index);
719 // already verified to be utf8
720 const int signature_ref_index =
721 cp->signature_ref_index_at(name_and_type_ref_index);
722 const Symbol* const name = cp->symbol_at(name_ref_index);
723 const Symbol* const signature = cp->symbol_at(signature_ref_index);
724 if (tag == JVM_CONSTANT_Fieldref) {
725 if (_need_verify) {
726 // Field name and signature are verified above, when iterating NameAndType_info.
727 // Need only to be sure signature is non-zero length and the right type.
728 if (signature->utf8_length() == 0 ||
729 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
730 throwIllegalSignature("Field", name, signature, CHECK);
731 }
732 }
733 } else {
734 if (_need_verify) {
735 // Method name and signature are verified above, when iterating NameAndType_info.
736 // Need only to be sure signature is non-zero length and the right type.
737 if (signature->utf8_length() == 0 ||
738 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
739 throwIllegalSignature("Method", name, signature, CHECK);
740 }
741 }
742 // 4509014: If a class method name begins with '<', it must be "<init>"
743 const unsigned int name_len = name->utf8_length();
744 if (tag == JVM_CONSTANT_Methodref &&
745 name_len != 0 &&
746 name->char_at(0) == '<' &&
747 name != vmSymbols::object_initializer_name()) {
748 classfile_parse_error(
749 "Bad method name at constant pool index %u in class file %s",
750 name_ref_index, CHECK);
751 }
752 }
753 break;
754 }
755 case JVM_CONSTANT_MethodHandle: {
756 const int ref_index = cp->method_handle_index_at(index);
757 const int ref_kind = cp->method_handle_ref_kind_at(index);
758 switch (ref_kind) {
759 case JVM_REF_invokeVirtual:
760 case JVM_REF_invokeStatic:
761 case JVM_REF_invokeSpecial:
762 case JVM_REF_newInvokeSpecial: {
763 const int name_and_type_ref_index =
764 cp->name_and_type_ref_index_at(ref_index);
765 const int name_ref_index =
766 cp->name_ref_index_at(name_and_type_ref_index);
767 const Symbol* const name = cp->symbol_at(name_ref_index);
768 if (name != vmSymbols::object_initializer_name()) {
769 if (ref_kind == JVM_REF_newInvokeSpecial) {
770 classfile_parse_error(
771 "Bad constructor name at constant pool index %u in class file %s",
772 name_ref_index, CHECK);
773 }
774 } else {
775 // The allowed invocation mode of <init> depends on its signature.
776 // This test corresponds to verify_invoke_instructions in the verifier.
777 const int signature_ref_index =
778 cp->signature_ref_index_at(name_and_type_ref_index);
779 const Symbol* const signature = cp->symbol_at(signature_ref_index);
780 if (signature->is_void_method_signature()
781 && ref_kind == JVM_REF_newInvokeSpecial) {
782 // OK, could be a constructor call
783 } else if (!signature->is_void_method_signature()
784 && ref_kind == JVM_REF_invokeStatic) {
785 // also OK, could be a static factory call
786 } else {
787 classfile_parse_error(
788 "Bad method name at constant pool index %u in class file %s",
789 name_ref_index, CHECK);
790 }
791 }
792 break;
793 }
794 // Other ref_kinds are already fully checked in previous pass.
795 } // switch(ref_kind)
796 break;
797 }
798 case JVM_CONSTANT_MethodType: {
799 const Symbol* const no_name = vmSymbols::type_name(); // place holder
800 const Symbol* const signature = cp->method_type_signature_at(index);
801 verify_legal_method_signature(no_name, signature, CHECK);
802 break;
803 }
804 case JVM_CONSTANT_Utf8: {
805 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
806 }
807 } // switch(tag)
808 } // end of for
809 }
810
811 Handle ClassFileParser::clear_cp_patch_at(int index) {
812 Handle patch = cp_patch_at(index);
813 _cp_patches->at_put(index, Handle());
814 assert(!has_cp_patch_at(index), "");
815 return patch;
816 }
817
818 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
819 int name_index = _orig_cp_size + _num_patched_klasses;
820 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
821
822 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
823 _num_patched_klasses ++;
824 }
825
826 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
827 int index,
828 Handle patch,
829 TRAPS) {
830 assert(cp != NULL, "invariant");
831
832 BasicType patch_type = T_VOID;
833
834 switch (cp->tag_at(index).value()) {
835
836 case JVM_CONSTANT_UnresolvedClass: {
837 // Patching a class means pre-resolving it.
838 // The name in the constant pool is ignored.
839 if (java_lang_Class::is_instance(patch())) {
840 guarantee_property(!java_lang_Class::is_primitive(patch()),
841 "Illegal class patch at %d in class file %s",
842 index, CHECK);
843 Klass* k = java_lang_Class::as_Klass(patch());
844 patch_class(cp, index, k, k->name());
845 } else {
846 guarantee_property(java_lang_String::is_instance(patch()),
847 "Illegal class patch at %d in class file %s",
848 index, CHECK);
849 Symbol* const name = java_lang_String::as_symbol(patch());
850 patch_class(cp, index, NULL, name);
851 }
852 break;
853 }
854
855 case JVM_CONSTANT_String: {
856 // skip this patch and don't clear it. Needs the oop array for resolved
857 // references to be created first.
858 return;
859 }
860 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
861 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
862 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
863 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
864 patch_prim:
865 {
866 jvalue value;
867 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
868 guarantee_property(value_type == patch_type,
869 "Illegal primitive patch at %d in class file %s",
870 index, CHECK);
871 switch (value_type) {
872 case T_INT: cp->int_at_put(index, value.i); break;
873 case T_FLOAT: cp->float_at_put(index, value.f); break;
874 case T_LONG: cp->long_at_put(index, value.j); break;
875 case T_DOUBLE: cp->double_at_put(index, value.d); break;
876 default: assert(false, "");
877 }
878 } // end patch_prim label
879 break;
880
881 default: {
882 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
883 guarantee_property(!has_cp_patch_at(index),
884 "Illegal unexpected patch at %d in class file %s",
885 index, CHECK);
886 return;
887 }
888 } // end of switch(tag)
889
890 // On fall-through, mark the patch as used.
891 clear_cp_patch_at(index);
892 }
893 class NameSigHash: public ResourceObj {
894 public:
895 const Symbol* _name; // name
896 const Symbol* _sig; // signature
897 NameSigHash* _next; // Next entry in hash table
898 };
899
900 static const int HASH_ROW_SIZE = 256;
901
902 static unsigned int hash(const Symbol* name, const Symbol* sig) {
903 unsigned int raw_hash = 0;
904 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
905 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
906
907 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
908 }
909
910
911 static void initialize_hashtable(NameSigHash** table) {
912 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
913 }
914 // Return false if the name/sig combination is found in table.
915 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
916 // The old format checker uses heap sort to find duplicates.
917 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
918 // of table since we don't expect Symbol*'s to move.
919 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
920 assert(name != NULL, "name in constant pool is NULL");
921
922 // First lookup for duplicates
923 int index = hash(name, sig);
924 NameSigHash* entry = table[index];
925 while (entry != NULL) {
926 if (entry->_name == name && entry->_sig == sig) {
927 return false;
928 }
929 entry = entry->_next;
930 }
931
932 // No duplicate is found, allocate a new entry and fill it.
933 entry = new NameSigHash();
934 entry->_name = name;
935 entry->_sig = sig;
936
937 // Insert into hash table
938 entry->_next = table[index];
939 table[index] = entry;
940
941 return true;
942 }
943
944 // Side-effects: populates the _local_interfaces field
945 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
946 const int itfs_len,
947 ConstantPool* const cp,
948 bool* const has_nonstatic_concrete_methods,
949 TRAPS) {
950 assert(stream != NULL, "invariant");
951 assert(cp != NULL, "invariant");
952 assert(has_nonstatic_concrete_methods != NULL, "invariant");
953
954 if (itfs_len == 0) {
955 _local_interfaces = Universe::the_empty_instance_klass_array();
956 } else {
957 assert(itfs_len > 0, "only called for len>0");
958 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
959
960 int index;
961 for (index = 0; index < itfs_len; index++) {
962 const u2 interface_index = stream->get_u2(CHECK);
963 Klass* interf;
964 check_property(
965 valid_klass_reference_at(interface_index),
966 "Interface name has bad constant pool index %u in class file %s",
967 interface_index, CHECK);
968 if (cp->tag_at(interface_index).is_klass()) {
969 interf = cp->resolved_klass_at(interface_index);
970 } else {
971 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
972
973 // Don't need to check legal name because it's checked when parsing constant pool.
974 // But need to make sure it's not an array type.
975 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
976 "Bad interface name in class file %s", CHECK);
977
978 // Call resolve_super so classcircularity is checked
979 interf = SystemDictionary::resolve_super_or_fail(
980 _class_name,
981 unresolved_klass,
982 Handle(THREAD, _loader_data->class_loader()),
983 _protection_domain,
984 false,
985 CHECK);
986 }
987
988 if (!interf->is_interface()) {
989 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
990 err_msg("class %s can not implement %s, because it is not an interface (%s)",
991 _class_name->as_klass_external_name(),
992 interf->external_name(),
993 interf->class_in_module_of_loader()));
994 }
995
996 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
997 *has_nonstatic_concrete_methods = true;
998 }
999 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
1000 }
1001
1002 if (!_need_verify || itfs_len <= 1) {
1003 return;
1004 }
1005
1006 // Check if there's any duplicates in interfaces
1007 ResourceMark rm(THREAD);
1008 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1009 NameSigHash*,
1010 HASH_ROW_SIZE);
1011 initialize_hashtable(interface_names);
1012 bool dup = false;
1013 const Symbol* name = NULL;
1014 {
1015 debug_only(NoSafepointVerifier nsv;)
1016 for (index = 0; index < itfs_len; index++) {
1017 const InstanceKlass* const k = _local_interfaces->at(index);
1018 name = k->name();
1019 // If no duplicates, add (name, NULL) in hashtable interface_names.
1020 if (!put_after_lookup(name, NULL, interface_names)) {
1021 dup = true;
1022 break;
1023 }
1024 }
1025 }
1026 if (dup) {
1027 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1028 name->as_C_string(), CHECK);
1029 }
1030 }
1031 }
1032
1033 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1034 int constantvalue_index,
1035 int signature_index,
1036 TRAPS) const {
1037 // Make sure the constant pool entry is of a type appropriate to this field
1038 guarantee_property(
1039 (constantvalue_index > 0 &&
1040 constantvalue_index < cp->length()),
1041 "Bad initial value index %u in ConstantValue attribute in class file %s",
1042 constantvalue_index, CHECK);
1043
1044 const constantTag value_type = cp->tag_at(constantvalue_index);
1045 switch(cp->basic_type_for_signature_at(signature_index)) {
1046 case T_LONG: {
1047 guarantee_property(value_type.is_long(),
1048 "Inconsistent constant value type in class file %s",
1049 CHECK);
1050 break;
1051 }
1052 case T_FLOAT: {
1053 guarantee_property(value_type.is_float(),
1054 "Inconsistent constant value type in class file %s",
1055 CHECK);
1056 break;
1057 }
1058 case T_DOUBLE: {
1059 guarantee_property(value_type.is_double(),
1060 "Inconsistent constant value type in class file %s",
1061 CHECK);
1062 break;
1063 }
1064 case T_BYTE:
1065 case T_CHAR:
1066 case T_SHORT:
1067 case T_BOOLEAN:
1068 case T_INT: {
1069 guarantee_property(value_type.is_int(),
1070 "Inconsistent constant value type in class file %s",
1071 CHECK);
1072 break;
1073 }
1074 case T_OBJECT: {
1075 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1076 && value_type.is_string()),
1077 "Bad string initial value in class file %s",
1078 CHECK);
1079 break;
1080 }
1081 default: {
1082 classfile_parse_error("Unable to set initial value %u in class file %s",
1083 constantvalue_index,
1084 CHECK);
1085 }
1086 }
1087 }
1088
1089 // This class also doubles as a holder for metadata cleanup.
1090 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1091 private:
1092 ClassLoaderData* _loader_data;
1093 AnnotationArray* _field_annotations;
1094 AnnotationArray* _field_type_annotations;
1095 public:
1096 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1097 AnnotationCollector(_in_field),
1098 _loader_data(loader_data),
1099 _field_annotations(NULL),
1100 _field_type_annotations(NULL) {}
1101 ~FieldAnnotationCollector();
1102 void apply_to(FieldInfo* f);
1103 AnnotationArray* field_annotations() { return _field_annotations; }
1104 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1105
1106 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1107 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1108 };
1109
1110 class MethodAnnotationCollector : public AnnotationCollector{
1111 public:
1112 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1113 void apply_to(const methodHandle& m);
1114 };
1115
1116
1117 static int skip_annotation_value(const u1*, int, int); // fwd decl
1118
1119 // Safely increment index by val if does not pass limit
1120 #define SAFE_ADD(index, limit, val) \
1121 if (index >= limit - val) return limit; \
1122 index += val;
1123
1124 // Skip an annotation. Return >=limit if there is any problem.
1125 static int skip_annotation(const u1* buffer, int limit, int index) {
1126 assert(buffer != NULL, "invariant");
1127 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1128 // value := switch (tag:u1) { ... }
1129 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1130 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1131 while (--nmem >= 0 && index < limit) {
1132 SAFE_ADD(index, limit, 2); // skip member
1133 index = skip_annotation_value(buffer, limit, index);
1134 }
1135 return index;
1136 }
1137
1138 // Skip an annotation value. Return >=limit if there is any problem.
1139 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1140 assert(buffer != NULL, "invariant");
1141
1142 // value := switch (tag:u1) {
1143 // case B, C, I, S, Z, D, F, J, c: con:u2;
1144 // case e: e_class:u2 e_name:u2;
1145 // case s: s_con:u2;
1146 // case [: do(nval:u2) {value};
1147 // case @: annotation;
1148 // case s: s_con:u2;
1149 // }
1150 SAFE_ADD(index, limit, 1); // read tag
1151 const u1 tag = buffer[index - 1];
1152 switch (tag) {
1153 case 'B':
1154 case 'C':
1155 case 'I':
1156 case 'S':
1157 case 'Z':
1158 case 'D':
1159 case 'F':
1160 case 'J':
1161 case 'c':
1162 case 's':
1163 SAFE_ADD(index, limit, 2); // skip con or s_con
1164 break;
1165 case 'e':
1166 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1167 break;
1168 case '[':
1169 {
1170 SAFE_ADD(index, limit, 2); // read nval
1171 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1172 while (--nval >= 0 && index < limit) {
1173 index = skip_annotation_value(buffer, limit, index);
1174 }
1175 }
1176 break;
1177 case '@':
1178 index = skip_annotation(buffer, limit, index);
1179 break;
1180 default:
1181 return limit; // bad tag byte
1182 }
1183 return index;
1184 }
1185
1186 // Sift through annotations, looking for those significant to the VM:
1187 static void parse_annotations(const ConstantPool* const cp,
1188 const u1* buffer, int limit,
1189 AnnotationCollector* coll,
1190 ClassLoaderData* loader_data,
1191 TRAPS) {
1192
1193 assert(cp != NULL, "invariant");
1194 assert(buffer != NULL, "invariant");
1195 assert(coll != NULL, "invariant");
1196 assert(loader_data != NULL, "invariant");
1197
1198 // annotations := do(nann:u2) {annotation}
1199 int index = 2; // read nann
1200 if (index >= limit) return;
1201 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1202 enum { // initial annotation layout
1203 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1204 count_off = 2, // u2 such as 1 (one value)
1205 member_off = 4, // utf8 such as 'value'
1206 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1207 e_tag_val = 'e',
1208 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1209 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1210 e_size = 11, // end of 'e' annotation
1211 c_tag_val = 'c', // payload is type
1212 c_con_off = 7, // utf8 payload, such as 'I'
1213 c_size = 9, // end of 'c' annotation
1214 s_tag_val = 's', // payload is String
1215 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1216 s_size = 9,
1217 min_size = 6 // smallest possible size (zero members)
1218 };
1219 // Cannot add min_size to index in case of overflow MAX_INT
1220 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1221 int index0 = index;
1222 index = skip_annotation(buffer, limit, index);
1223 const u1* const abase = buffer + index0;
1224 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1225 const int count = Bytes::get_Java_u2((address)abase + count_off);
1226 const Symbol* const aname = check_symbol_at(cp, atype);
1227 if (aname == NULL) break; // invalid annotation name
1228 const Symbol* member = NULL;
1229 if (count >= 1) {
1230 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1231 member = check_symbol_at(cp, member_index);
1232 if (member == NULL) break; // invalid member name
1233 }
1234
1235 // Here is where parsing particular annotations will take place.
1236 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1237 if (AnnotationCollector::_unknown == id) continue;
1238 coll->set_annotation(id);
1239
1240 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1241 // @Contended can optionally specify the contention group.
1242 //
1243 // Contended group defines the equivalence class over the fields:
1244 // the fields within the same contended group are not treated distinct.
1245 // The only exception is default group, which does not incur the
1246 // equivalence. Naturally, contention group for classes is meaningless.
1247 //
1248 // While the contention group is specified as String, annotation
1249 // values are already interned, and we might as well use the constant
1250 // pool index as the group tag.
1251 //
1252 u2 group_index = 0; // default contended group
1253 if (count == 1
1254 && s_size == (index - index0) // match size
1255 && s_tag_val == *(abase + tag_off)
1256 && member == vmSymbols::value_name()) {
1257 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1258 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1259 group_index = 0; // default contended group
1260 }
1261 }
1262 coll->set_contended_group(group_index);
1263 }
1264 }
1265 }
1266
1267
1268 // Parse attributes for a field.
1269 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1270 u2 attributes_count,
1271 bool is_static, u2 signature_index,
1272 u2* const constantvalue_index_addr,
1273 bool* const is_synthetic_addr,
1274 u2* const generic_signature_index_addr,
1275 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1276 TRAPS) {
1277 assert(cfs != NULL, "invariant");
1278 assert(constantvalue_index_addr != NULL, "invariant");
1279 assert(is_synthetic_addr != NULL, "invariant");
1280 assert(generic_signature_index_addr != NULL, "invariant");
1281 assert(parsed_annotations != NULL, "invariant");
1282 assert(attributes_count > 0, "attributes_count should be greater than 0");
1283
1284 u2 constantvalue_index = 0;
1285 u2 generic_signature_index = 0;
1286 bool is_synthetic = false;
1287 const u1* runtime_visible_annotations = NULL;
1288 int runtime_visible_annotations_length = 0;
1289 const u1* runtime_invisible_annotations = NULL;
1290 int runtime_invisible_annotations_length = 0;
1291 const u1* runtime_visible_type_annotations = NULL;
1292 int runtime_visible_type_annotations_length = 0;
1293 const u1* runtime_invisible_type_annotations = NULL;
1294 int runtime_invisible_type_annotations_length = 0;
1295 bool runtime_invisible_annotations_exists = false;
1296 bool runtime_invisible_type_annotations_exists = false;
1297 const ConstantPool* const cp = _cp;
1298
1299 while (attributes_count--) {
1300 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1301 const u2 attribute_name_index = cfs->get_u2_fast();
1302 const u4 attribute_length = cfs->get_u4_fast();
1303 check_property(valid_symbol_at(attribute_name_index),
1304 "Invalid field attribute index %u in class file %s",
1305 attribute_name_index,
1306 CHECK);
1307
1308 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1309 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1310 // ignore if non-static
1311 if (constantvalue_index != 0) {
1312 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1313 }
1314 check_property(
1315 attribute_length == 2,
1316 "Invalid ConstantValue field attribute length %u in class file %s",
1317 attribute_length, CHECK);
1318
1319 constantvalue_index = cfs->get_u2(CHECK);
1320 if (_need_verify) {
1321 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1322 }
1323 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1324 if (attribute_length != 0) {
1325 classfile_parse_error(
1326 "Invalid Synthetic field attribute length %u in class file %s",
1327 attribute_length, CHECK);
1328 }
1329 is_synthetic = true;
1330 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1331 if (attribute_length != 0) {
1332 classfile_parse_error(
1333 "Invalid Deprecated field attribute length %u in class file %s",
1334 attribute_length, CHECK);
1335 }
1336 } else if (_major_version >= JAVA_1_5_VERSION) {
1337 if (attribute_name == vmSymbols::tag_signature()) {
1338 if (generic_signature_index != 0) {
1339 classfile_parse_error(
1340 "Multiple Signature attributes for field in class file %s", CHECK);
1341 }
1342 if (attribute_length != 2) {
1343 classfile_parse_error(
1344 "Wrong size %u for field's Signature attribute in class file %s",
1345 attribute_length, CHECK);
1346 }
1347 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1348 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1349 if (runtime_visible_annotations != NULL) {
1350 classfile_parse_error(
1351 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1352 }
1353 runtime_visible_annotations_length = attribute_length;
1354 runtime_visible_annotations = cfs->current();
1355 assert(runtime_visible_annotations != NULL, "null visible annotations");
1356 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1357 parse_annotations(cp,
1358 runtime_visible_annotations,
1359 runtime_visible_annotations_length,
1360 parsed_annotations,
1361 _loader_data,
1362 CHECK);
1363 cfs->skip_u1_fast(runtime_visible_annotations_length);
1364 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1365 if (runtime_invisible_annotations_exists) {
1366 classfile_parse_error(
1367 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1368 }
1369 runtime_invisible_annotations_exists = true;
1370 if (PreserveAllAnnotations) {
1371 runtime_invisible_annotations_length = attribute_length;
1372 runtime_invisible_annotations = cfs->current();
1373 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1374 }
1375 cfs->skip_u1(attribute_length, CHECK);
1376 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1377 if (runtime_visible_type_annotations != NULL) {
1378 classfile_parse_error(
1379 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1380 }
1381 runtime_visible_type_annotations_length = attribute_length;
1382 runtime_visible_type_annotations = cfs->current();
1383 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1384 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1385 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1386 if (runtime_invisible_type_annotations_exists) {
1387 classfile_parse_error(
1388 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1389 } else {
1390 runtime_invisible_type_annotations_exists = true;
1391 }
1392 if (PreserveAllAnnotations) {
1393 runtime_invisible_type_annotations_length = attribute_length;
1394 runtime_invisible_type_annotations = cfs->current();
1395 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1396 }
1397 cfs->skip_u1(attribute_length, CHECK);
1398 } else {
1399 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1400 }
1401 } else {
1402 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1403 }
1404 }
1405
1406 *constantvalue_index_addr = constantvalue_index;
1407 *is_synthetic_addr = is_synthetic;
1408 *generic_signature_index_addr = generic_signature_index;
1409 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1410 runtime_visible_annotations_length,
1411 runtime_invisible_annotations,
1412 runtime_invisible_annotations_length,
1413 CHECK);
1414 parsed_annotations->set_field_annotations(a);
1415 a = assemble_annotations(runtime_visible_type_annotations,
1416 runtime_visible_type_annotations_length,
1417 runtime_invisible_type_annotations,
1418 runtime_invisible_type_annotations_length,
1419 CHECK);
1420 parsed_annotations->set_field_type_annotations(a);
1421 return;
1422 }
1423
1424
1425 // Field allocation types. Used for computing field offsets.
1426
1427 enum FieldAllocationType {
1428 STATIC_OOP, // Oops
1429 STATIC_BYTE, // Boolean, Byte, char
1430 STATIC_SHORT, // shorts
1431 STATIC_WORD, // ints
1432 STATIC_DOUBLE, // aligned long or double
1433 STATIC_FLATTENABLE, // flattenable field
1434 NONSTATIC_OOP,
1435 NONSTATIC_BYTE,
1436 NONSTATIC_SHORT,
1437 NONSTATIC_WORD,
1438 NONSTATIC_DOUBLE,
1439 NONSTATIC_FLATTENABLE,
1440 MAX_FIELD_ALLOCATION_TYPE,
1441 BAD_ALLOCATION_TYPE = -1
1442 };
1443
1444 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1445 BAD_ALLOCATION_TYPE, // 0
1446 BAD_ALLOCATION_TYPE, // 1
1447 BAD_ALLOCATION_TYPE, // 2
1448 BAD_ALLOCATION_TYPE, // 3
1449 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1450 NONSTATIC_SHORT, // T_CHAR = 5,
1451 NONSTATIC_WORD, // T_FLOAT = 6,
1452 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1453 NONSTATIC_BYTE, // T_BYTE = 8,
1454 NONSTATIC_SHORT, // T_SHORT = 9,
1455 NONSTATIC_WORD, // T_INT = 10,
1456 NONSTATIC_DOUBLE, // T_LONG = 11,
1457 NONSTATIC_OOP, // T_OBJECT = 12,
1458 NONSTATIC_OOP, // T_ARRAY = 13,
1459 NONSTATIC_OOP, // T_VALUETYPE = 14,
1460 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1461 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1462 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1463 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1464 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1465 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1466 BAD_ALLOCATION_TYPE, // 0
1467 BAD_ALLOCATION_TYPE, // 1
1468 BAD_ALLOCATION_TYPE, // 2
1469 BAD_ALLOCATION_TYPE, // 3
1470 STATIC_BYTE , // T_BOOLEAN = 4,
1471 STATIC_SHORT, // T_CHAR = 5,
1472 STATIC_WORD, // T_FLOAT = 6,
1473 STATIC_DOUBLE, // T_DOUBLE = 7,
1474 STATIC_BYTE, // T_BYTE = 8,
1475 STATIC_SHORT, // T_SHORT = 9,
1476 STATIC_WORD, // T_INT = 10,
1477 STATIC_DOUBLE, // T_LONG = 11,
1478 STATIC_OOP, // T_OBJECT = 12,
1479 STATIC_OOP, // T_ARRAY = 13,
1480 STATIC_OOP, // T_VALUETYPE = 14,
1481 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1482 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1483 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1484 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1485 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1486 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1487 };
1488
1489 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1490 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1491 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1492 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1493 if (is_flattenable) {
1494 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1495 }
1496 return result;
1497 }
1498
1499 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1500 public:
1501 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1502
1503 FieldAllocationCount() {
1504 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1505 count[i] = 0;
1506 }
1507 }
1508
1509 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1510 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1511 if (atype != BAD_ALLOCATION_TYPE) {
1512 // Make sure there is no overflow with injected fields.
1513 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1514 count[atype]++;
1515 }
1516 return atype;
1517 }
1518 };
1519
1520 // Side-effects: populates the _fields, _fields_annotations,
1521 // _fields_type_annotations fields
1522 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1523 bool is_interface,
1524 bool is_value_type,
1525 FieldAllocationCount* const fac,
1526 ConstantPool* cp,
1527 const int cp_size,
1528 u2* const java_fields_count_ptr,
1529 TRAPS) {
1530
1531 assert(cfs != NULL, "invariant");
1532 assert(fac != NULL, "invariant");
1533 assert(cp != NULL, "invariant");
1534 assert(java_fields_count_ptr != NULL, "invariant");
1535
1536 assert(NULL == _fields, "invariant");
1537 assert(NULL == _fields_annotations, "invariant");
1538 assert(NULL == _fields_type_annotations, "invariant");
1539
1540 cfs->guarantee_more(2, CHECK); // length
1541 const u2 length = cfs->get_u2_fast();
1542 *java_fields_count_ptr = length;
1543
1544 int num_injected = 0;
1545 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1546 &num_injected);
1547
1548 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1549
1550 // The field array starts with tuples of shorts
1551 // [access, name index, sig index, initial value index, byte offset].
1552 // A generic signature slot only exists for field with generic
1553 // signature attribute. And the access flag is set with
1554 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1555 // signature slots are at the end of the field array and after all
1556 // other fields data.
1557 //
1558 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1559 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1560 // ...
1561 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1562 // [generic signature index]
1563 // [generic signature index]
1564 // ...
1565 //
1566 // Allocate a temporary resource array for field data. For each field,
1567 // a slot is reserved in the temporary array for the generic signature
1568 // index. After parsing all fields, the data are copied to a permanent
1569 // array and any unused slots will be discarded.
1570 ResourceMark rm(THREAD);
1571 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1572 u2,
1573 total_fields * (FieldInfo::field_slots + 1));
1574
1575 // The generic signature slots start after all other fields' data.
1576 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1577 int num_generic_signature = 0;
1578 for (int n = 0; n < length; n++) {
1579 // access_flags, name_index, descriptor_index, attributes_count
1580 cfs->guarantee_more(8, CHECK);
1581
1582 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1583
1584 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1585 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1586 AccessFlags access_flags;
1587 access_flags.set_flags(flags);
1588
1589 const u2 name_index = cfs->get_u2_fast();
1590 check_property(valid_symbol_at(name_index),
1591 "Invalid constant pool index %u for field name in class file %s",
1592 name_index, CHECK);
1593 const Symbol* const name = cp->symbol_at(name_index);
1594 verify_legal_field_name(name, CHECK);
1595
1596 const u2 signature_index = cfs->get_u2_fast();
1597 check_property(valid_symbol_at(signature_index),
1598 "Invalid constant pool index %u for field signature in class file %s",
1599 signature_index, CHECK);
1600 const Symbol* const sig = cp->symbol_at(signature_index);
1601 verify_legal_field_signature(name, sig, CHECK);
1602 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1603 if (sig->is_Q_signature()) {
1604 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1605 access_flags.set_is_flattenable();
1606 }
1607 if (access_flags.is_flattenable()) {
1608 // Array flattenability cannot be specified. Arrays of value classes are
1609 // are always flattenable. Arrays of other classes are not flattenable.
1610 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1611 classfile_parse_error(
1612 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1613 " ACC_FLATTENABLE cannot be specified for an array",
1614 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1615 }
1616 _has_flattenable_fields = true;
1617 }
1618
1619 u2 constantvalue_index = 0;
1620 bool is_synthetic = false;
1621 u2 generic_signature_index = 0;
1622 const bool is_static = access_flags.is_static();
1623 FieldAnnotationCollector parsed_annotations(_loader_data);
1624
1625 const u2 attributes_count = cfs->get_u2_fast();
1626 if (attributes_count > 0) {
1627 parse_field_attributes(cfs,
1628 attributes_count,
1629 is_static,
1630 signature_index,
1631 &constantvalue_index,
1632 &is_synthetic,
1633 &generic_signature_index,
1634 &parsed_annotations,
1635 CHECK);
1636
1637 if (parsed_annotations.field_annotations() != NULL) {
1638 if (_fields_annotations == NULL) {
1639 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1640 _loader_data, length, NULL,
1641 CHECK);
1642 }
1643 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1644 parsed_annotations.set_field_annotations(NULL);
1645 }
1646 if (parsed_annotations.field_type_annotations() != NULL) {
1647 if (_fields_type_annotations == NULL) {
1648 _fields_type_annotations =
1649 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1650 length,
1651 NULL,
1652 CHECK);
1653 }
1654 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1655 parsed_annotations.set_field_type_annotations(NULL);
1656 }
1657
1658 if (is_synthetic) {
1659 access_flags.set_is_synthetic();
1660 }
1661 if (generic_signature_index != 0) {
1662 access_flags.set_field_has_generic_signature();
1663 fa[generic_signature_slot] = generic_signature_index;
1664 generic_signature_slot ++;
1665 num_generic_signature ++;
1666 }
1667 }
1668
1669 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1670 field->initialize(access_flags.as_short(),
1671 name_index,
1672 signature_index,
1673 constantvalue_index);
1674 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1675
1676 // Remember how many oops we encountered and compute allocation type
1677 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1678 field->set_allocation_type(atype);
1679
1680 // After field is initialized with type, we can augment it with aux info
1681 if (parsed_annotations.has_any_annotations())
1682 parsed_annotations.apply_to(field);
1683 }
1684
1685 int index = length;
1686 if (num_injected != 0) {
1687 for (int n = 0; n < num_injected; n++) {
1688 // Check for duplicates
1689 if (injected[n].may_be_java) {
1690 const Symbol* const name = injected[n].name();
1691 const Symbol* const signature = injected[n].signature();
1692 bool duplicate = false;
1693 for (int i = 0; i < length; i++) {
1694 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1695 if (name == cp->symbol_at(f->name_index()) &&
1696 signature == cp->symbol_at(f->signature_index())) {
1697 // Symbol is desclared in Java so skip this one
1698 duplicate = true;
1699 break;
1700 }
1701 }
1702 if (duplicate) {
1703 // These will be removed from the field array at the end
1704 continue;
1705 }
1706 }
1707
1708 // Injected field
1709 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1710 field->initialize(JVM_ACC_FIELD_INTERNAL,
1711 injected[n].name_index,
1712 injected[n].signature_index,
1713 0);
1714
1715 const BasicType type = FieldType::basic_type(injected[n].signature());
1716
1717 // Remember how many oops we encountered and compute allocation type
1718 const FieldAllocationType atype = fac->update(false, type, false);
1719 field->set_allocation_type(atype);
1720 index++;
1721 }
1722 }
1723
1724 if (is_value_type) {
1725 index = length + num_injected;
1726 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1727 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1728 vmSymbols::default_value_name_enum,
1729 vmSymbols::java_lang_Object_enum,
1730 0);
1731 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1732 const FieldAllocationType atype = fac->update(true, type, false);
1733 field->set_allocation_type(atype);
1734 index++;
1735 }
1736
1737 assert(NULL == _fields, "invariant");
1738
1739 _fields =
1740 MetadataFactory::new_array<u2>(_loader_data,
1741 index * FieldInfo::field_slots + num_generic_signature,
1742 CHECK);
1743 // Sometimes injected fields already exist in the Java source so
1744 // the fields array could be too long. In that case the
1745 // fields array is trimed. Also unused slots that were reserved
1746 // for generic signature indexes are discarded.
1747 {
1748 int i = 0;
1749 for (; i < index * FieldInfo::field_slots; i++) {
1750 _fields->at_put(i, fa[i]);
1751 }
1752 for (int j = total_fields * FieldInfo::field_slots;
1753 j < generic_signature_slot; j++) {
1754 _fields->at_put(i++, fa[j]);
1755 }
1756 assert(_fields->length() == i, "");
1757 }
1758
1759 if (_need_verify && length > 1) {
1760 // Check duplicated fields
1761 ResourceMark rm(THREAD);
1762 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1763 THREAD, NameSigHash*, HASH_ROW_SIZE);
1764 initialize_hashtable(names_and_sigs);
1765 bool dup = false;
1766 const Symbol* name = NULL;
1767 const Symbol* sig = NULL;
1768 {
1769 debug_only(NoSafepointVerifier nsv;)
1770 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1771 name = fs.name();
1772 sig = fs.signature();
1773 // If no duplicates, add name/signature in hashtable names_and_sigs.
1774 if (!put_after_lookup(name, sig, names_and_sigs)) {
1775 dup = true;
1776 break;
1777 }
1778 }
1779 }
1780 if (dup) {
1781 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1782 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1783 }
1784 }
1785 }
1786
1787
1788 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1789 u4 code_length,
1790 u4 exception_table_length,
1791 TRAPS) {
1792 assert(cfs != NULL, "invariant");
1793
1794 const unsafe_u2* const exception_table_start = cfs->current();
1795 assert(exception_table_start != NULL, "null exception table");
1796
1797 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1798 // end_pc,
1799 // handler_pc,
1800 // catch_type_index
1801
1802 // Will check legal target after parsing code array in verifier.
1803 if (_need_verify) {
1804 for (unsigned int i = 0; i < exception_table_length; i++) {
1805 const u2 start_pc = cfs->get_u2_fast();
1806 const u2 end_pc = cfs->get_u2_fast();
1807 const u2 handler_pc = cfs->get_u2_fast();
1808 const u2 catch_type_index = cfs->get_u2_fast();
1809 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1810 "Illegal exception table range in class file %s",
1811 CHECK_NULL);
1812 guarantee_property(handler_pc < code_length,
1813 "Illegal exception table handler in class file %s",
1814 CHECK_NULL);
1815 if (catch_type_index != 0) {
1816 guarantee_property(valid_klass_reference_at(catch_type_index),
1817 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1818 }
1819 }
1820 } else {
1821 cfs->skip_u2_fast(exception_table_length * 4);
1822 }
1823 return exception_table_start;
1824 }
1825
1826 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1827 u4 code_length,
1828 CompressedLineNumberWriteStream**const write_stream,
1829 TRAPS) {
1830
1831 const ClassFileStream* const cfs = _stream;
1832 unsigned int num_entries = cfs->get_u2(CHECK);
1833
1834 // Each entry is a u2 start_pc, and a u2 line_number
1835 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1836
1837 // Verify line number attribute and table length
1838 check_property(
1839 code_attribute_length == sizeof(u2) + length_in_bytes,
1840 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1841
1842 cfs->guarantee_more(length_in_bytes, CHECK);
1843
1844 if ((*write_stream) == NULL) {
1845 if (length_in_bytes > fixed_buffer_size) {
1846 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1847 } else {
1848 (*write_stream) = new CompressedLineNumberWriteStream(
1849 _linenumbertable_buffer, fixed_buffer_size);
1850 }
1851 }
1852
1853 while (num_entries-- > 0) {
1854 const u2 bci = cfs->get_u2_fast(); // start_pc
1855 const u2 line = cfs->get_u2_fast(); // line_number
1856 guarantee_property(bci < code_length,
1857 "Invalid pc in LineNumberTable in class file %s", CHECK);
1858 (*write_stream)->write_pair(bci, line);
1859 }
1860 }
1861
1862
1863 class LVT_Hash : public AllStatic {
1864 public:
1865
1866 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1867 /*
1868 * 3-tuple start_bci/length/slot has to be unique key,
1869 * so the following comparison seems to be redundant:
1870 * && elem->name_cp_index == entry->_elem->name_cp_index
1871 */
1872 return (e0.start_bci == e1.start_bci &&
1873 e0.length == e1.length &&
1874 e0.name_cp_index == e1.name_cp_index &&
1875 e0.slot == e1.slot);
1876 }
1877
1878 static unsigned int hash(LocalVariableTableElement const& e0) {
1879 unsigned int raw_hash = e0.start_bci;
1880
1881 raw_hash = e0.length + raw_hash * 37;
1882 raw_hash = e0.name_cp_index + raw_hash * 37;
1883 raw_hash = e0.slot + raw_hash * 37;
1884
1885 return raw_hash;
1886 }
1887 };
1888
1889
1890 // Class file LocalVariableTable elements.
1891 class Classfile_LVT_Element {
1892 public:
1893 u2 start_bci;
1894 u2 length;
1895 u2 name_cp_index;
1896 u2 descriptor_cp_index;
1897 u2 slot;
1898 };
1899
1900 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1901 LocalVariableTableElement* const lvt) {
1902 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1903 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1904 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1905 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1906 lvt->signature_cp_index = 0;
1907 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1908 }
1909
1910 // Function is used to parse both attributes:
1911 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1912 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1913 u4 code_length,
1914 u2 max_locals,
1915 u4 code_attribute_length,
1916 u2* const localvariable_table_length,
1917 bool isLVTT,
1918 TRAPS) {
1919 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1920 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1921 const unsigned int size =
1922 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1923
1924 const ConstantPool* const cp = _cp;
1925
1926 // Verify local variable table attribute has right length
1927 if (_need_verify) {
1928 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1929 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1930 }
1931
1932 const unsafe_u2* const localvariable_table_start = cfs->current();
1933 assert(localvariable_table_start != NULL, "null local variable table");
1934 if (!_need_verify) {
1935 cfs->skip_u2_fast(size);
1936 } else {
1937 cfs->guarantee_more(size * 2, CHECK_NULL);
1938 for(int i = 0; i < (*localvariable_table_length); i++) {
1939 const u2 start_pc = cfs->get_u2_fast();
1940 const u2 length = cfs->get_u2_fast();
1941 const u2 name_index = cfs->get_u2_fast();
1942 const u2 descriptor_index = cfs->get_u2_fast();
1943 const u2 index = cfs->get_u2_fast();
1944 // Assign to a u4 to avoid overflow
1945 const u4 end_pc = (u4)start_pc + (u4)length;
1946
1947 if (start_pc >= code_length) {
1948 classfile_parse_error(
1949 "Invalid start_pc %u in %s in class file %s",
1950 start_pc, tbl_name, CHECK_NULL);
1951 }
1952 if (end_pc > code_length) {
1953 classfile_parse_error(
1954 "Invalid length %u in %s in class file %s",
1955 length, tbl_name, CHECK_NULL);
1956 }
1957 const int cp_size = cp->length();
1958 guarantee_property(valid_symbol_at(name_index),
1959 "Name index %u in %s has bad constant type in class file %s",
1960 name_index, tbl_name, CHECK_NULL);
1961 guarantee_property(valid_symbol_at(descriptor_index),
1962 "Signature index %u in %s has bad constant type in class file %s",
1963 descriptor_index, tbl_name, CHECK_NULL);
1964
1965 const Symbol* const name = cp->symbol_at(name_index);
1966 const Symbol* const sig = cp->symbol_at(descriptor_index);
1967 verify_legal_field_name(name, CHECK_NULL);
1968 u2 extra_slot = 0;
1969 if (!isLVTT) {
1970 verify_legal_field_signature(name, sig, CHECK_NULL);
1971
1972 // 4894874: check special cases for double and long local variables
1973 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1974 sig == vmSymbols::type_signature(T_LONG)) {
1975 extra_slot = 1;
1976 }
1977 }
1978 guarantee_property((index + extra_slot) < max_locals,
1979 "Invalid index %u in %s in class file %s",
1980 index, tbl_name, CHECK_NULL);
1981 }
1982 }
1983 return localvariable_table_start;
1984 }
1985
1986 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1987 u4 code_attribute_length,
1988 bool need_verify,
1989 TRAPS) {
1990 assert(cfs != NULL, "invariant");
1991
1992 if (0 == code_attribute_length) {
1993 return NULL;
1994 }
1995
1996 const u1* const stackmap_table_start = cfs->current();
1997 assert(stackmap_table_start != NULL, "null stackmap table");
1998
1999 // check code_attribute_length first
2000 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2001
2002 if (!need_verify && !DumpSharedSpaces) {
2003 return NULL;
2004 }
2005 return stackmap_table_start;
2006 }
2007
2008 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2009 u2* const checked_exceptions_length,
2010 u4 method_attribute_length,
2011 TRAPS) {
2012 assert(cfs != NULL, "invariant");
2013 assert(checked_exceptions_length != NULL, "invariant");
2014
2015 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2016 *checked_exceptions_length = cfs->get_u2_fast();
2017 const unsigned int size =
2018 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2019 const unsafe_u2* const checked_exceptions_start = cfs->current();
2020 assert(checked_exceptions_start != NULL, "null checked exceptions");
2021 if (!_need_verify) {
2022 cfs->skip_u2_fast(size);
2023 } else {
2024 // Verify each value in the checked exception table
2025 u2 checked_exception;
2026 const u2 len = *checked_exceptions_length;
2027 cfs->guarantee_more(2 * len, CHECK_NULL);
2028 for (int i = 0; i < len; i++) {
2029 checked_exception = cfs->get_u2_fast();
2030 check_property(
2031 valid_klass_reference_at(checked_exception),
2032 "Exception name has bad type at constant pool %u in class file %s",
2033 checked_exception, CHECK_NULL);
2034 }
2035 }
2036 // check exceptions attribute length
2037 if (_need_verify) {
2038 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2039 sizeof(u2) * size),
2040 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2041 }
2042 return checked_exceptions_start;
2043 }
2044
2045 void ClassFileParser::throwIllegalSignature(const char* type,
2046 const Symbol* name,
2047 const Symbol* sig,
2048 TRAPS) const {
2049 assert(name != NULL, "invariant");
2050 assert(sig != NULL, "invariant");
2051
2052 const char* class_note = "";
2053 if (is_value_type() && name == vmSymbols::object_initializer_name()) {
2054 class_note = " (an inline class)";
2055 }
2056
2057 ResourceMark rm(THREAD);
2058 Exceptions::fthrow(THREAD_AND_LOCATION,
2059 vmSymbols::java_lang_ClassFormatError(),
2060 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2061 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2062 }
2063
2064 AnnotationCollector::ID
2065 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2066 const Symbol* name) {
2067 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2068 // Privileged code can use all annotations. Other code silently drops some.
2069 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2070 loader_data->is_platform_class_loader_data() ||
2071 loader_data->is_unsafe_anonymous();
2072 switch (sid) {
2073 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2074 if (_location != _in_method) break; // only allow for methods
2075 if (!privileged) break; // only allow in privileged code
2076 return _method_CallerSensitive;
2077 }
2078 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2079 if (_location != _in_method) break; // only allow for methods
2080 if (!privileged) break; // only allow in privileged code
2081 return _method_ForceInline;
2082 }
2083 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2084 if (_location != _in_method) break; // only allow for methods
2085 if (!privileged) break; // only allow in privileged code
2086 return _method_DontInline;
2087 }
2088 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2089 if (_location != _in_method) break; // only allow for methods
2090 if (!privileged) break; // only allow in privileged code
2091 return _method_InjectedProfile;
2092 }
2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2094 if (_location != _in_method) break; // only allow for methods
2095 if (!privileged) break; // only allow in privileged code
2096 return _method_LambdaForm_Compiled;
2097 }
2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2099 if (_location != _in_method) break; // only allow for methods
2100 if (!privileged) break; // only allow in privileged code
2101 return _method_Hidden;
2102 }
2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2104 if (_location != _in_method) break; // only allow for methods
2105 if (!privileged) break; // only allow in privileged code
2106 return _method_HotSpotIntrinsicCandidate;
2107 }
2108 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2109 if (_location != _in_field) break; // only allow for fields
2110 if (!privileged) break; // only allow in privileged code
2111 return _field_Stable;
2112 }
2113 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2114 if (_location != _in_field && _location != _in_class) {
2115 break; // only allow for fields and classes
2116 }
2117 if (!EnableContended || (RestrictContended && !privileged)) {
2118 break; // honor privileges
2119 }
2120 return _jdk_internal_vm_annotation_Contended;
2121 }
2122 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2123 if (_location != _in_method) break; // only allow for methods
2124 if (RestrictReservedStack && !privileged) break; // honor privileges
2125 return _jdk_internal_vm_annotation_ReservedStackAccess;
2126 }
2127 default: {
2128 break;
2129 }
2130 }
2131 return AnnotationCollector::_unknown;
2132 }
2133
2134 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2135 if (is_contended())
2136 f->set_contended_group(contended_group());
2137 if (is_stable())
2138 f->set_stable(true);
2139 }
2140
2141 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2142 // If there's an error deallocate metadata for field annotations
2143 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2144 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2145 }
2146
2147 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2148 if (has_annotation(_method_CallerSensitive))
2149 m->set_caller_sensitive(true);
2150 if (has_annotation(_method_ForceInline))
2151 m->set_force_inline(true);
2152 if (has_annotation(_method_DontInline))
2153 m->set_dont_inline(true);
2154 if (has_annotation(_method_InjectedProfile))
2155 m->set_has_injected_profile(true);
2156 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2157 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2158 if (has_annotation(_method_Hidden))
2159 m->set_hidden(true);
2160 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2161 m->set_intrinsic_candidate(true);
2162 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2163 m->set_has_reserved_stack_access(true);
2164 }
2165
2166 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2167 assert(ik != NULL, "invariant");
2168 ik->set_is_contended(is_contended());
2169 }
2170
2171 #define MAX_ARGS_SIZE 255
2172 #define MAX_CODE_SIZE 65535
2173 #define INITIAL_MAX_LVT_NUMBER 256
2174
2175 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2176 *
2177 * Rules for LVT's and LVTT's are:
2178 * - There can be any number of LVT's and LVTT's.
2179 * - If there are n LVT's, it is the same as if there was just
2180 * one LVT containing all the entries from the n LVT's.
2181 * - There may be no more than one LVT entry per local variable.
2182 * Two LVT entries are 'equal' if these fields are the same:
2183 * start_pc, length, name, slot
2184 * - There may be no more than one LVTT entry per each LVT entry.
2185 * Each LVTT entry has to match some LVT entry.
2186 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2187 */
2188 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2189 int lvt_cnt,
2190 u2* const localvariable_table_length,
2191 const unsafe_u2** const localvariable_table_start,
2192 int lvtt_cnt,
2193 u2* const localvariable_type_table_length,
2194 const unsafe_u2** const localvariable_type_table_start,
2195 TRAPS) {
2196
2197 ResourceMark rm(THREAD);
2198
2199 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2200 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2201
2202 LVT_HashTable* const table = new LVT_HashTable();
2203
2204 // To fill LocalVariableTable in
2205 const Classfile_LVT_Element* cf_lvt;
2206 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2207
2208 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2209 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2210 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2211 copy_lvt_element(&cf_lvt[idx], lvt);
2212 // If no duplicates, add LVT elem in hashtable.
2213 if (table->put(*lvt, lvt) == false
2214 && _need_verify
2215 && _major_version >= JAVA_1_5_VERSION) {
2216 classfile_parse_error("Duplicated LocalVariableTable attribute "
2217 "entry for '%s' in class file %s",
2218 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2219 CHECK);
2220 }
2221 }
2222 }
2223
2224 // To merge LocalVariableTable and LocalVariableTypeTable
2225 const Classfile_LVT_Element* cf_lvtt;
2226 LocalVariableTableElement lvtt_elem;
2227
2228 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2229 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2230 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2231 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2232 LocalVariableTableElement** entry = table->get(lvtt_elem);
2233 if (entry == NULL) {
2234 if (_need_verify) {
2235 classfile_parse_error("LVTT entry for '%s' in class file %s "
2236 "does not match any LVT entry",
2237 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2238 CHECK);
2239 }
2240 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2241 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2242 "entry for '%s' in class file %s",
2243 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2244 CHECK);
2245 } else {
2246 // to add generic signatures into LocalVariableTable
2247 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2248 }
2249 }
2250 }
2251 }
2252
2253
2254 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2255 const u1* runtime_visible_annotations,
2256 int runtime_visible_annotations_length,
2257 const u1* runtime_invisible_annotations,
2258 int runtime_invisible_annotations_length,
2259 const u1* runtime_visible_parameter_annotations,
2260 int runtime_visible_parameter_annotations_length,
2261 const u1* runtime_invisible_parameter_annotations,
2262 int runtime_invisible_parameter_annotations_length,
2263 const u1* runtime_visible_type_annotations,
2264 int runtime_visible_type_annotations_length,
2265 const u1* runtime_invisible_type_annotations,
2266 int runtime_invisible_type_annotations_length,
2267 const u1* annotation_default,
2268 int annotation_default_length,
2269 TRAPS) {
2270
2271 AnnotationArray* a;
2272
2273 if (runtime_visible_annotations_length +
2274 runtime_invisible_annotations_length > 0) {
2275 a = assemble_annotations(runtime_visible_annotations,
2276 runtime_visible_annotations_length,
2277 runtime_invisible_annotations,
2278 runtime_invisible_annotations_length,
2279 CHECK);
2280 cm->set_method_annotations(a);
2281 }
2282
2283 if (runtime_visible_parameter_annotations_length +
2284 runtime_invisible_parameter_annotations_length > 0) {
2285 a = assemble_annotations(runtime_visible_parameter_annotations,
2286 runtime_visible_parameter_annotations_length,
2287 runtime_invisible_parameter_annotations,
2288 runtime_invisible_parameter_annotations_length,
2289 CHECK);
2290 cm->set_parameter_annotations(a);
2291 }
2292
2293 if (annotation_default_length > 0) {
2294 a = assemble_annotations(annotation_default,
2295 annotation_default_length,
2296 NULL,
2297 0,
2298 CHECK);
2299 cm->set_default_annotations(a);
2300 }
2301
2302 if (runtime_visible_type_annotations_length +
2303 runtime_invisible_type_annotations_length > 0) {
2304 a = assemble_annotations(runtime_visible_type_annotations,
2305 runtime_visible_type_annotations_length,
2306 runtime_invisible_type_annotations,
2307 runtime_invisible_type_annotations_length,
2308 CHECK);
2309 cm->set_type_annotations(a);
2310 }
2311 }
2312
2313
2314 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2315 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2316 // Method* to save footprint, so we only know the size of the resulting Method* when the
2317 // entire method attribute is parsed.
2318 //
2319 // The promoted_flags parameter is used to pass relevant access_flags
2320 // from the method back up to the containing klass. These flag values
2321 // are added to klass's access_flags.
2322
2323 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2324 bool is_interface,
2325 bool is_value_type,
2326 const ConstantPool* cp,
2327 AccessFlags* const promoted_flags,
2328 TRAPS) {
2329 assert(cfs != NULL, "invariant");
2330 assert(cp != NULL, "invariant");
2331 assert(promoted_flags != NULL, "invariant");
2332
2333 ResourceMark rm(THREAD);
2334 // Parse fixed parts:
2335 // access_flags, name_index, descriptor_index, attributes_count
2336 cfs->guarantee_more(8, CHECK_NULL);
2337
2338 int flags = cfs->get_u2_fast();
2339 const u2 name_index = cfs->get_u2_fast();
2340 const int cp_size = cp->length();
2341 check_property(
2342 valid_symbol_at(name_index),
2343 "Illegal constant pool index %u for method name in class file %s",
2344 name_index, CHECK_NULL);
2345 const Symbol* const name = cp->symbol_at(name_index);
2346 verify_legal_method_name(name, CHECK_NULL);
2347
2348 const u2 signature_index = cfs->get_u2_fast();
2349 guarantee_property(
2350 valid_symbol_at(signature_index),
2351 "Illegal constant pool index %u for method signature in class file %s",
2352 signature_index, CHECK_NULL);
2353 const Symbol* const signature = cp->symbol_at(signature_index);
2354
2355 if (name == vmSymbols::class_initializer_name()) {
2356 // We ignore the other access flags for a valid class initializer.
2357 // (JVM Spec 2nd ed., chapter 4.6)
2358 if (_major_version < 51) { // backward compatibility
2359 flags = JVM_ACC_STATIC;
2360 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2361 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2362 } else {
2363 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2364 }
2365 } else {
2366 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2367 }
2368
2369 if (name == vmSymbols::object_initializer_name()) {
2370 if (is_interface) {
2371 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2372 } else if (!is_value_type && signature->is_void_method_signature()) {
2373 // OK, a constructor
2374 } else if (is_value_type && !signature->is_void_method_signature()) {
2375 // also OK, a static factory, as long as the return value is good
2376 bool ok = false;
2377 SignatureStream ss((Symbol*) signature, true);
2378 while (!ss.at_return_type()) ss.next();
2379 if (ss.is_object()) {
2380 TempNewSymbol ret = ss.as_symbol_or_null();
2381 const Symbol* required = class_name();
2382 if (is_unsafe_anonymous()) {
2383 // The original class name in the UAC byte stream gets changed. So
2384 // using the original name in the return type is no longer valid.
2385 required = vmSymbols::java_lang_Object();
2386 }
2387 ok = (ret == required);
2388 }
2389 if (!ok) {
2390 throwIllegalSignature("Method", name, signature, CHECK_0);
2391 }
2392 } else {
2393 // not OK, so throw the same error as in verify_legal_method_signature.
2394 throwIllegalSignature("Method", name, signature, CHECK_0);
2395 }
2396 // A declared <init> method must always be either a non-static
2397 // object constructor, with a void return, or else it must be a
2398 // static factory method, with a non-void return. No other
2399 // definition of <init> is possible.
2400 //
2401 // The verifier (in verify_invoke_instructions) will inspect the
2402 // signature of any attempt to invoke <init>, and ensures that it
2403 // returns non-void if and only if it is being invoked by
2404 // invokestatic, and void if and only if it is being invoked by
2405 // invokespecial.
2406 //
2407 // When a symbolic reference to <init> is resolved for a
2408 // particular invocation mode (special or static), the mode is
2409 // matched to the JVM_ACC_STATIC modifier of the <init> method.
2410 // Thus, it is impossible to statically invoke a constructor, and
2411 // impossible to "new + invokespecial" a static factory, either
2412 // through bytecode or through reflection.
2413 }
2414
2415 int args_size = -1; // only used when _need_verify is true
2416 if (_need_verify) {
2417 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2418 verify_legal_method_signature(name, signature, CHECK_NULL);
2419 if (args_size > MAX_ARGS_SIZE) {
2420 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2421 }
2422 }
2423
2424 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2425
2426 // Default values for code and exceptions attribute elements
2427 u2 max_stack = 0;
2428 u2 max_locals = 0;
2429 u4 code_length = 0;
2430 const u1* code_start = 0;
2431 u2 exception_table_length = 0;
2432 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2433 Array<int>* exception_handlers = Universe::the_empty_int_array();
2434 u2 checked_exceptions_length = 0;
2435 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2436 CompressedLineNumberWriteStream* linenumber_table = NULL;
2437 int linenumber_table_length = 0;
2438 int total_lvt_length = 0;
2439 u2 lvt_cnt = 0;
2440 u2 lvtt_cnt = 0;
2441 bool lvt_allocated = false;
2442 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2443 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2444 u2* localvariable_table_length = NULL;
2445 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2446 u2* localvariable_type_table_length = NULL;
2447 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2448 int method_parameters_length = -1;
2449 const u1* method_parameters_data = NULL;
2450 bool method_parameters_seen = false;
2451 bool parsed_code_attribute = false;
2452 bool parsed_checked_exceptions_attribute = false;
2453 bool parsed_stackmap_attribute = false;
2454 // stackmap attribute - JDK1.5
2455 const u1* stackmap_data = NULL;
2456 int stackmap_data_length = 0;
2457 u2 generic_signature_index = 0;
2458 MethodAnnotationCollector parsed_annotations;
2459 const u1* runtime_visible_annotations = NULL;
2460 int runtime_visible_annotations_length = 0;
2461 const u1* runtime_invisible_annotations = NULL;
2462 int runtime_invisible_annotations_length = 0;
2463 const u1* runtime_visible_parameter_annotations = NULL;
2464 int runtime_visible_parameter_annotations_length = 0;
2465 const u1* runtime_invisible_parameter_annotations = NULL;
2466 int runtime_invisible_parameter_annotations_length = 0;
2467 const u1* runtime_visible_type_annotations = NULL;
2468 int runtime_visible_type_annotations_length = 0;
2469 const u1* runtime_invisible_type_annotations = NULL;
2470 int runtime_invisible_type_annotations_length = 0;
2471 bool runtime_invisible_annotations_exists = false;
2472 bool runtime_invisible_type_annotations_exists = false;
2473 bool runtime_invisible_parameter_annotations_exists = false;
2474 const u1* annotation_default = NULL;
2475 int annotation_default_length = 0;
2476
2477 // Parse code and exceptions attribute
2478 u2 method_attributes_count = cfs->get_u2_fast();
2479 while (method_attributes_count--) {
2480 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2481 const u2 method_attribute_name_index = cfs->get_u2_fast();
2482 const u4 method_attribute_length = cfs->get_u4_fast();
2483 check_property(
2484 valid_symbol_at(method_attribute_name_index),
2485 "Invalid method attribute name index %u in class file %s",
2486 method_attribute_name_index, CHECK_NULL);
2487
2488 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2489 if (method_attribute_name == vmSymbols::tag_code()) {
2490 // Parse Code attribute
2491 if (_need_verify) {
2492 guarantee_property(
2493 !access_flags.is_native() && !access_flags.is_abstract(),
2494 "Code attribute in native or abstract methods in class file %s",
2495 CHECK_NULL);
2496 }
2497 if (parsed_code_attribute) {
2498 classfile_parse_error("Multiple Code attributes in class file %s",
2499 CHECK_NULL);
2500 }
2501 parsed_code_attribute = true;
2502
2503 // Stack size, locals size, and code size
2504 if (_major_version == 45 && _minor_version <= 2) {
2505 cfs->guarantee_more(4, CHECK_NULL);
2506 max_stack = cfs->get_u1_fast();
2507 max_locals = cfs->get_u1_fast();
2508 code_length = cfs->get_u2_fast();
2509 } else {
2510 cfs->guarantee_more(8, CHECK_NULL);
2511 max_stack = cfs->get_u2_fast();
2512 max_locals = cfs->get_u2_fast();
2513 code_length = cfs->get_u4_fast();
2514 }
2515 if (_need_verify) {
2516 guarantee_property(args_size <= max_locals,
2517 "Arguments can't fit into locals in class file %s",
2518 CHECK_NULL);
2519 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2520 "Invalid method Code length %u in class file %s",
2521 code_length, CHECK_NULL);
2522 }
2523 // Code pointer
2524 code_start = cfs->current();
2525 assert(code_start != NULL, "null code start");
2526 cfs->guarantee_more(code_length, CHECK_NULL);
2527 cfs->skip_u1_fast(code_length);
2528
2529 // Exception handler table
2530 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2531 exception_table_length = cfs->get_u2_fast();
2532 if (exception_table_length > 0) {
2533 exception_table_start = parse_exception_table(cfs,
2534 code_length,
2535 exception_table_length,
2536 CHECK_NULL);
2537 }
2538
2539 // Parse additional attributes in code attribute
2540 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2541 u2 code_attributes_count = cfs->get_u2_fast();
2542
2543 unsigned int calculated_attribute_length = 0;
2544
2545 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2546 calculated_attribute_length =
2547 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2548 } else {
2549 // max_stack, locals and length are smaller in pre-version 45.2 classes
2550 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2551 }
2552 calculated_attribute_length +=
2553 code_length +
2554 sizeof(exception_table_length) +
2555 sizeof(code_attributes_count) +
2556 exception_table_length *
2557 ( sizeof(u2) + // start_pc
2558 sizeof(u2) + // end_pc
2559 sizeof(u2) + // handler_pc
2560 sizeof(u2) ); // catch_type_index
2561
2562 while (code_attributes_count--) {
2563 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2564 const u2 code_attribute_name_index = cfs->get_u2_fast();
2565 const u4 code_attribute_length = cfs->get_u4_fast();
2566 calculated_attribute_length += code_attribute_length +
2567 sizeof(code_attribute_name_index) +
2568 sizeof(code_attribute_length);
2569 check_property(valid_symbol_at(code_attribute_name_index),
2570 "Invalid code attribute name index %u in class file %s",
2571 code_attribute_name_index,
2572 CHECK_NULL);
2573 if (LoadLineNumberTables &&
2574 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2575 // Parse and compress line number table
2576 parse_linenumber_table(code_attribute_length,
2577 code_length,
2578 &linenumber_table,
2579 CHECK_NULL);
2580
2581 } else if (LoadLocalVariableTables &&
2582 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2583 // Parse local variable table
2584 if (!lvt_allocated) {
2585 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2586 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2587 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2588 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2589 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2590 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2591 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2592 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2593 lvt_allocated = true;
2594 }
2595 if (lvt_cnt == max_lvt_cnt) {
2596 max_lvt_cnt <<= 1;
2597 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2598 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2599 }
2600 localvariable_table_start[lvt_cnt] =
2601 parse_localvariable_table(cfs,
2602 code_length,
2603 max_locals,
2604 code_attribute_length,
2605 &localvariable_table_length[lvt_cnt],
2606 false, // is not LVTT
2607 CHECK_NULL);
2608 total_lvt_length += localvariable_table_length[lvt_cnt];
2609 lvt_cnt++;
2610 } else if (LoadLocalVariableTypeTables &&
2611 _major_version >= JAVA_1_5_VERSION &&
2612 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2613 if (!lvt_allocated) {
2614 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2615 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2616 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2617 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2618 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2619 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2620 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2621 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2622 lvt_allocated = true;
2623 }
2624 // Parse local variable type table
2625 if (lvtt_cnt == max_lvtt_cnt) {
2626 max_lvtt_cnt <<= 1;
2627 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2628 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2629 }
2630 localvariable_type_table_start[lvtt_cnt] =
2631 parse_localvariable_table(cfs,
2632 code_length,
2633 max_locals,
2634 code_attribute_length,
2635 &localvariable_type_table_length[lvtt_cnt],
2636 true, // is LVTT
2637 CHECK_NULL);
2638 lvtt_cnt++;
2639 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2640 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2641 // Stack map is only needed by the new verifier in JDK1.5.
2642 if (parsed_stackmap_attribute) {
2643 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2644 }
2645 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2646 stackmap_data_length = code_attribute_length;
2647 parsed_stackmap_attribute = true;
2648 } else {
2649 // Skip unknown attributes
2650 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2651 }
2652 }
2653 // check method attribute length
2654 if (_need_verify) {
2655 guarantee_property(method_attribute_length == calculated_attribute_length,
2656 "Code segment has wrong length in class file %s",
2657 CHECK_NULL);
2658 }
2659 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2660 // Parse Exceptions attribute
2661 if (parsed_checked_exceptions_attribute) {
2662 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2663 CHECK_NULL);
2664 }
2665 parsed_checked_exceptions_attribute = true;
2666 checked_exceptions_start =
2667 parse_checked_exceptions(cfs,
2668 &checked_exceptions_length,
2669 method_attribute_length,
2670 CHECK_NULL);
2671 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2672 // reject multiple method parameters
2673 if (method_parameters_seen) {
2674 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2675 CHECK_NULL);
2676 }
2677 method_parameters_seen = true;
2678 method_parameters_length = cfs->get_u1_fast();
2679 const u2 real_length = (method_parameters_length * 4u) + 1u;
2680 if (method_attribute_length != real_length) {
2681 classfile_parse_error(
2682 "Invalid MethodParameters method attribute length %u in class file",
2683 method_attribute_length, CHECK_NULL);
2684 }
2685 method_parameters_data = cfs->current();
2686 cfs->skip_u2_fast(method_parameters_length);
2687 cfs->skip_u2_fast(method_parameters_length);
2688 // ignore this attribute if it cannot be reflected
2689 if (!SystemDictionary::Parameter_klass_loaded())
2690 method_parameters_length = -1;
2691 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2692 if (method_attribute_length != 0) {
2693 classfile_parse_error(
2694 "Invalid Synthetic method attribute length %u in class file %s",
2695 method_attribute_length, CHECK_NULL);
2696 }
2697 // Should we check that there hasn't already been a synthetic attribute?
2698 access_flags.set_is_synthetic();
2699 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2700 if (method_attribute_length != 0) {
2701 classfile_parse_error(
2702 "Invalid Deprecated method attribute length %u in class file %s",
2703 method_attribute_length, CHECK_NULL);
2704 }
2705 } else if (_major_version >= JAVA_1_5_VERSION) {
2706 if (method_attribute_name == vmSymbols::tag_signature()) {
2707 if (generic_signature_index != 0) {
2708 classfile_parse_error(
2709 "Multiple Signature attributes for method in class file %s",
2710 CHECK_NULL);
2711 }
2712 if (method_attribute_length != 2) {
2713 classfile_parse_error(
2714 "Invalid Signature attribute length %u in class file %s",
2715 method_attribute_length, CHECK_NULL);
2716 }
2717 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2718 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2719 if (runtime_visible_annotations != NULL) {
2720 classfile_parse_error(
2721 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2722 CHECK_NULL);
2723 }
2724 runtime_visible_annotations_length = method_attribute_length;
2725 runtime_visible_annotations = cfs->current();
2726 assert(runtime_visible_annotations != NULL, "null visible annotations");
2727 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2728 parse_annotations(cp,
2729 runtime_visible_annotations,
2730 runtime_visible_annotations_length,
2731 &parsed_annotations,
2732 _loader_data,
2733 CHECK_NULL);
2734 cfs->skip_u1_fast(runtime_visible_annotations_length);
2735 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2736 if (runtime_invisible_annotations_exists) {
2737 classfile_parse_error(
2738 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2739 CHECK_NULL);
2740 }
2741 runtime_invisible_annotations_exists = true;
2742 if (PreserveAllAnnotations) {
2743 runtime_invisible_annotations_length = method_attribute_length;
2744 runtime_invisible_annotations = cfs->current();
2745 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2746 }
2747 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2748 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2749 if (runtime_visible_parameter_annotations != NULL) {
2750 classfile_parse_error(
2751 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2752 CHECK_NULL);
2753 }
2754 runtime_visible_parameter_annotations_length = method_attribute_length;
2755 runtime_visible_parameter_annotations = cfs->current();
2756 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2757 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2758 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2759 if (runtime_invisible_parameter_annotations_exists) {
2760 classfile_parse_error(
2761 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2762 CHECK_NULL);
2763 }
2764 runtime_invisible_parameter_annotations_exists = true;
2765 if (PreserveAllAnnotations) {
2766 runtime_invisible_parameter_annotations_length = method_attribute_length;
2767 runtime_invisible_parameter_annotations = cfs->current();
2768 assert(runtime_invisible_parameter_annotations != NULL,
2769 "null invisible parameter annotations");
2770 }
2771 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2772 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2773 if (annotation_default != NULL) {
2774 classfile_parse_error(
2775 "Multiple AnnotationDefault attributes for method in class file %s",
2776 CHECK_NULL);
2777 }
2778 annotation_default_length = method_attribute_length;
2779 annotation_default = cfs->current();
2780 assert(annotation_default != NULL, "null annotation default");
2781 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2782 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2783 if (runtime_visible_type_annotations != NULL) {
2784 classfile_parse_error(
2785 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2786 CHECK_NULL);
2787 }
2788 runtime_visible_type_annotations_length = method_attribute_length;
2789 runtime_visible_type_annotations = cfs->current();
2790 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2791 // No need for the VM to parse Type annotations
2792 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2793 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2794 if (runtime_invisible_type_annotations_exists) {
2795 classfile_parse_error(
2796 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2797 CHECK_NULL);
2798 } else {
2799 runtime_invisible_type_annotations_exists = true;
2800 }
2801 if (PreserveAllAnnotations) {
2802 runtime_invisible_type_annotations_length = method_attribute_length;
2803 runtime_invisible_type_annotations = cfs->current();
2804 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2805 }
2806 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2807 } else {
2808 // Skip unknown attributes
2809 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2810 }
2811 } else {
2812 // Skip unknown attributes
2813 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2814 }
2815 }
2816
2817 if (linenumber_table != NULL) {
2818 linenumber_table->write_terminator();
2819 linenumber_table_length = linenumber_table->position();
2820 }
2821
2822 // Make sure there's at least one Code attribute in non-native/non-abstract method
2823 if (_need_verify) {
2824 guarantee_property(access_flags.is_native() ||
2825 access_flags.is_abstract() ||
2826 parsed_code_attribute,
2827 "Absent Code attribute in method that is not native or abstract in class file %s",
2828 CHECK_NULL);
2829 }
2830
2831 // All sizing information for a Method* is finally available, now create it
2832 InlineTableSizes sizes(
2833 total_lvt_length,
2834 linenumber_table_length,
2835 exception_table_length,
2836 checked_exceptions_length,
2837 method_parameters_length,
2838 generic_signature_index,
2839 runtime_visible_annotations_length +
2840 runtime_invisible_annotations_length,
2841 runtime_visible_parameter_annotations_length +
2842 runtime_invisible_parameter_annotations_length,
2843 runtime_visible_type_annotations_length +
2844 runtime_invisible_type_annotations_length,
2845 annotation_default_length,
2846 0);
2847
2848 Method* const m = Method::allocate(_loader_data,
2849 code_length,
2850 access_flags,
2851 &sizes,
2852 ConstMethod::NORMAL,
2853 CHECK_NULL);
2854
2855 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2856
2857 // Fill in information from fixed part (access_flags already set)
2858 m->set_constants(_cp);
2859 m->set_name_index(name_index);
2860 m->set_signature_index(signature_index);
2861
2862 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2863 m->constMethod()->set_result_type(rtf.type());
2864
2865 if (args_size >= 0) {
2866 m->set_size_of_parameters(args_size);
2867 } else {
2868 m->compute_size_of_parameters(THREAD);
2869 }
2870 #ifdef ASSERT
2871 if (args_size >= 0) {
2872 m->compute_size_of_parameters(THREAD);
2873 assert(args_size == m->size_of_parameters(), "");
2874 }
2875 #endif
2876
2877 // Fill in code attribute information
2878 m->set_max_stack(max_stack);
2879 m->set_max_locals(max_locals);
2880 if (stackmap_data != NULL) {
2881 m->constMethod()->copy_stackmap_data(_loader_data,
2882 (u1*)stackmap_data,
2883 stackmap_data_length,
2884 CHECK_NULL);
2885 }
2886
2887 // Copy byte codes
2888 m->set_code((u1*)code_start);
2889
2890 // Copy line number table
2891 if (linenumber_table != NULL) {
2892 memcpy(m->compressed_linenumber_table(),
2893 linenumber_table->buffer(),
2894 linenumber_table_length);
2895 }
2896
2897 // Copy exception table
2898 if (exception_table_length > 0) {
2899 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2900 m->exception_table_start(),
2901 exception_table_length * sizeof(ExceptionTableElement),
2902 sizeof(u2));
2903 }
2904
2905 // Copy method parameters
2906 if (method_parameters_length > 0) {
2907 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2908 for (int i = 0; i < method_parameters_length; i++) {
2909 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2910 method_parameters_data += 2;
2911 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2912 method_parameters_data += 2;
2913 }
2914 }
2915
2916 // Copy checked exceptions
2917 if (checked_exceptions_length > 0) {
2918 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2919 m->checked_exceptions_start(),
2920 checked_exceptions_length * sizeof(CheckedExceptionElement),
2921 sizeof(u2));
2922 }
2923
2924 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2925 if (total_lvt_length > 0) {
2926 promoted_flags->set_has_localvariable_table();
2927 copy_localvariable_table(m->constMethod(),
2928 lvt_cnt,
2929 localvariable_table_length,
2930 localvariable_table_start,
2931 lvtt_cnt,
2932 localvariable_type_table_length,
2933 localvariable_type_table_start,
2934 CHECK_NULL);
2935 }
2936
2937 if (parsed_annotations.has_any_annotations())
2938 parsed_annotations.apply_to(m);
2939
2940 // Copy annotations
2941 copy_method_annotations(m->constMethod(),
2942 runtime_visible_annotations,
2943 runtime_visible_annotations_length,
2944 runtime_invisible_annotations,
2945 runtime_invisible_annotations_length,
2946 runtime_visible_parameter_annotations,
2947 runtime_visible_parameter_annotations_length,
2948 runtime_invisible_parameter_annotations,
2949 runtime_invisible_parameter_annotations_length,
2950 runtime_visible_type_annotations,
2951 runtime_visible_type_annotations_length,
2952 runtime_invisible_type_annotations,
2953 runtime_invisible_type_annotations_length,
2954 annotation_default,
2955 annotation_default_length,
2956 CHECK_NULL);
2957
2958 if (name == vmSymbols::finalize_method_name() &&
2959 signature == vmSymbols::void_method_signature()) {
2960 if (m->is_empty_method()) {
2961 _has_empty_finalizer = true;
2962 } else {
2963 _has_finalizer = true;
2964 }
2965 }
2966 if (name == vmSymbols::object_initializer_name() &&
2967 signature == vmSymbols::void_method_signature() &&
2968 m->is_vanilla_constructor()) {
2969 _has_vanilla_constructor = true;
2970 }
2971
2972 NOT_PRODUCT(m->verify());
2973 return m;
2974 }
2975
2976
2977 // The promoted_flags parameter is used to pass relevant access_flags
2978 // from the methods back up to the containing klass. These flag values
2979 // are added to klass's access_flags.
2980 // Side-effects: populates the _methods field in the parser
2981 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2982 bool is_interface,
2983 bool is_value_type,
2984 AccessFlags* promoted_flags,
2985 bool* has_final_method,
2986 bool* declares_nonstatic_concrete_methods,
2987 TRAPS) {
2988 assert(cfs != NULL, "invariant");
2989 assert(promoted_flags != NULL, "invariant");
2990 assert(has_final_method != NULL, "invariant");
2991 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2992
2993 assert(NULL == _methods, "invariant");
2994
2995 cfs->guarantee_more(2, CHECK); // length
2996 const u2 length = cfs->get_u2_fast();
2997 if (length == 0) {
2998 _methods = Universe::the_empty_method_array();
2999 } else {
3000 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3001 length,
3002 NULL,
3003 CHECK);
3004
3005 for (int index = 0; index < length; index++) {
3006 Method* method = parse_method(cfs,
3007 is_interface,
3008 is_value_type,
3009 _cp,
3010 promoted_flags,
3011 CHECK);
3012
3013 if (method->is_final()) {
3014 *has_final_method = true;
3015 }
3016 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3017 // used for interface initialization, and default method inheritance analysis
3018 if (is_interface && !(*declares_nonstatic_concrete_methods)
3019 && !method->is_abstract() && !method->is_static()) {
3020 *declares_nonstatic_concrete_methods = true;
3021 }
3022 _methods->at_put(index, method);
3023 }
3024
3025 if (_need_verify && length > 1) {
3026 // Check duplicated methods
3027 ResourceMark rm(THREAD);
3028 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3029 THREAD, NameSigHash*, HASH_ROW_SIZE);
3030 initialize_hashtable(names_and_sigs);
3031 bool dup = false;
3032 const Symbol* name = NULL;
3033 const Symbol* sig = NULL;
3034 {
3035 debug_only(NoSafepointVerifier nsv;)
3036 for (int i = 0; i < length; i++) {
3037 const Method* const m = _methods->at(i);
3038 name = m->name();
3039 sig = m->signature();
3040 // If no duplicates, add name/signature in hashtable names_and_sigs.
3041 if (!put_after_lookup(name, sig, names_and_sigs)) {
3042 dup = true;
3043 break;
3044 }
3045 }
3046 }
3047 if (dup) {
3048 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3049 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3050 }
3051 }
3052 }
3053 }
3054
3055 static const intArray* sort_methods(Array<Method*>* methods) {
3056 const int length = methods->length();
3057 // If JVMTI original method ordering or sharing is enabled we have to
3058 // remember the original class file ordering.
3059 // We temporarily use the vtable_index field in the Method* to store the
3060 // class file index, so we can read in after calling qsort.
3061 // Put the method ordering in the shared archive.
3062 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3063 for (int index = 0; index < length; index++) {
3064 Method* const m = methods->at(index);
3065 assert(!m->valid_vtable_index(), "vtable index should not be set");
3066 m->set_vtable_index(index);
3067 }
3068 }
3069 // Sort method array by ascending method name (for faster lookups & vtable construction)
3070 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3071 Method::sort_methods(methods);
3072
3073 intArray* method_ordering = NULL;
3074 // If JVMTI original method ordering or sharing is enabled construct int
3075 // array remembering the original ordering
3076 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3077 method_ordering = new intArray(length, length, -1);
3078 for (int index = 0; index < length; index++) {
3079 Method* const m = methods->at(index);
3080 const int old_index = m->vtable_index();
3081 assert(old_index >= 0 && old_index < length, "invalid method index");
3082 method_ordering->at_put(index, old_index);
3083 m->set_vtable_index(Method::invalid_vtable_index);
3084 }
3085 }
3086 return method_ordering;
3087 }
3088
3089 // Parse generic_signature attribute for methods and fields
3090 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3091 TRAPS) {
3092 assert(cfs != NULL, "invariant");
3093
3094 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3095 const u2 generic_signature_index = cfs->get_u2_fast();
3096 check_property(
3097 valid_symbol_at(generic_signature_index),
3098 "Invalid Signature attribute at constant pool index %u in class file %s",
3099 generic_signature_index, CHECK_0);
3100 return generic_signature_index;
3101 }
3102
3103 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3104 TRAPS) {
3105
3106 assert(cfs != NULL, "invariant");
3107
3108 cfs->guarantee_more(2, CHECK); // sourcefile_index
3109 const u2 sourcefile_index = cfs->get_u2_fast();
3110 check_property(
3111 valid_symbol_at(sourcefile_index),
3112 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3113 sourcefile_index, CHECK);
3114 set_class_sourcefile_index(sourcefile_index);
3115 }
3116
3117 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3118 int length,
3119 TRAPS) {
3120 assert(cfs != NULL, "invariant");
3121
3122 const u1* const sde_buffer = cfs->current();
3123 assert(sde_buffer != NULL, "null sde buffer");
3124
3125 // Don't bother storing it if there is no way to retrieve it
3126 if (JvmtiExport::can_get_source_debug_extension()) {
3127 assert((length+1) > length, "Overflow checking");
3128 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3129 for (int i = 0; i < length; i++) {
3130 sde[i] = sde_buffer[i];
3131 }
3132 sde[length] = '\0';
3133 set_class_sde_buffer((const char*)sde, length);
3134 }
3135 // Got utf8 string, set stream position forward
3136 cfs->skip_u1(length, CHECK);
3137 }
3138
3139
3140 // Inner classes can be static, private or protected (classic VM does this)
3141 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3142 JVM_ACC_PRIVATE | \
3143 JVM_ACC_PROTECTED | \
3144 JVM_ACC_STATIC \
3145 )
3146
3147 // Return number of classes in the inner classes attribute table
3148 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3149 const u1* const inner_classes_attribute_start,
3150 bool parsed_enclosingmethod_attribute,
3151 u2 enclosing_method_class_index,
3152 u2 enclosing_method_method_index,
3153 TRAPS) {
3154 const u1* const current_mark = cfs->current();
3155 u2 length = 0;
3156 if (inner_classes_attribute_start != NULL) {
3157 cfs->set_current(inner_classes_attribute_start);
3158 cfs->guarantee_more(2, CHECK_0); // length
3159 length = cfs->get_u2_fast();
3160 }
3161
3162 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3163 // method data:
3164 // [inner_class_info_index,
3165 // outer_class_info_index,
3166 // inner_name_index,
3167 // inner_class_access_flags,
3168 // ...
3169 // enclosing_method_class_index,
3170 // enclosing_method_method_index]
3171 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3172 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3173 _inner_classes = inner_classes;
3174
3175 int index = 0;
3176 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3177 for (int n = 0; n < length; n++) {
3178 // Inner class index
3179 const u2 inner_class_info_index = cfs->get_u2_fast();
3180 check_property(
3181 valid_klass_reference_at(inner_class_info_index),
3182 "inner_class_info_index %u has bad constant type in class file %s",
3183 inner_class_info_index, CHECK_0);
3184 // Outer class index
3185 const u2 outer_class_info_index = cfs->get_u2_fast();
3186 check_property(
3187 outer_class_info_index == 0 ||
3188 valid_klass_reference_at(outer_class_info_index),
3189 "outer_class_info_index %u has bad constant type in class file %s",
3190 outer_class_info_index, CHECK_0);
3191 // Inner class name
3192 const u2 inner_name_index = cfs->get_u2_fast();
3193 check_property(
3194 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3195 "inner_name_index %u has bad constant type in class file %s",
3196 inner_name_index, CHECK_0);
3197 if (_need_verify) {
3198 guarantee_property(inner_class_info_index != outer_class_info_index,
3199 "Class is both outer and inner class in class file %s", CHECK_0);
3200 }
3201
3202 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3203 // JVM_ACC_MODULE is defined in JDK-9 and later.
3204 if (_major_version >= JAVA_9_VERSION) {
3205 recognized_modifiers |= JVM_ACC_MODULE;
3206 }
3207 // JVM_ACC_VALUE is defined for class file version 55 and later
3208 if (supports_value_types()) {
3209 recognized_modifiers |= JVM_ACC_VALUE;
3210 }
3211
3212 // Access flags
3213 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3214
3215 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3216 // Set abstract bit for old class files for backward compatibility
3217 flags |= JVM_ACC_ABSTRACT;
3218 }
3219 verify_legal_class_modifiers(flags, CHECK_0);
3220 AccessFlags inner_access_flags(flags);
3221
3222 inner_classes->at_put(index++, inner_class_info_index);
3223 inner_classes->at_put(index++, outer_class_info_index);
3224 inner_classes->at_put(index++, inner_name_index);
3225 inner_classes->at_put(index++, inner_access_flags.as_short());
3226 }
3227
3228 // 4347400: make sure there's no duplicate entry in the classes array
3229 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3230 for(int i = 0; i < length * 4; i += 4) {
3231 for(int j = i + 4; j < length * 4; j += 4) {
3232 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3233 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3234 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3235 inner_classes->at(i+3) != inner_classes->at(j+3)),
3236 "Duplicate entry in InnerClasses in class file %s",
3237 CHECK_0);
3238 }
3239 }
3240 }
3241
3242 // Set EnclosingMethod class and method indexes.
3243 if (parsed_enclosingmethod_attribute) {
3244 inner_classes->at_put(index++, enclosing_method_class_index);
3245 inner_classes->at_put(index++, enclosing_method_method_index);
3246 }
3247 assert(index == size, "wrong size");
3248
3249 // Restore buffer's current position.
3250 cfs->set_current(current_mark);
3251
3252 return length;
3253 }
3254
3255 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3256 const u1* const nest_members_attribute_start,
3257 TRAPS) {
3258 const u1* const current_mark = cfs->current();
3259 u2 length = 0;
3260 if (nest_members_attribute_start != NULL) {
3261 cfs->set_current(nest_members_attribute_start);
3262 cfs->guarantee_more(2, CHECK_0); // length
3263 length = cfs->get_u2_fast();
3264 }
3265 const int size = length;
3266 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3267 _nest_members = nest_members;
3268
3269 int index = 0;
3270 cfs->guarantee_more(2 * length, CHECK_0);
3271 for (int n = 0; n < length; n++) {
3272 const u2 class_info_index = cfs->get_u2_fast();
3273 check_property(
3274 valid_klass_reference_at(class_info_index),
3275 "Nest member class_info_index %u has bad constant type in class file %s",
3276 class_info_index, CHECK_0);
3277 nest_members->at_put(index++, class_info_index);
3278 }
3279 assert(index == size, "wrong size");
3280
3281 // Restore buffer's current position.
3282 cfs->set_current(current_mark);
3283
3284 return length;
3285 }
3286
3287 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3288 set_class_synthetic_flag(true);
3289 }
3290
3291 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3292 assert(cfs != NULL, "invariant");
3293
3294 const u2 signature_index = cfs->get_u2(CHECK);
3295 check_property(
3296 valid_symbol_at(signature_index),
3297 "Invalid constant pool index %u in Signature attribute in class file %s",
3298 signature_index, CHECK);
3299 set_class_generic_signature_index(signature_index);
3300 }
3301
3302 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3303 ConstantPool* cp,
3304 u4 attribute_byte_length,
3305 TRAPS) {
3306 assert(cfs != NULL, "invariant");
3307 assert(cp != NULL, "invariant");
3308
3309 const u1* const current_start = cfs->current();
3310
3311 guarantee_property(attribute_byte_length >= sizeof(u2),
3312 "Invalid BootstrapMethods attribute length %u in class file %s",
3313 attribute_byte_length,
3314 CHECK);
3315
3316 cfs->guarantee_more(attribute_byte_length, CHECK);
3317
3318 const int attribute_array_length = cfs->get_u2_fast();
3319
3320 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3321 "Short length on BootstrapMethods in class file %s",
3322 CHECK);
3323
3324
3325 // The attribute contains a counted array of counted tuples of shorts,
3326 // represending bootstrap specifiers:
3327 // length*{bootstrap_method_index, argument_count*{argument_index}}
3328 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3329 // operand_count = number of shorts in attr, except for leading length
3330
3331 // The attribute is copied into a short[] array.
3332 // The array begins with a series of short[2] pairs, one for each tuple.
3333 const int index_size = (attribute_array_length * 2);
3334
3335 Array<u2>* const operands =
3336 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3337
3338 // Eagerly assign operands so they will be deallocated with the constant
3339 // pool if there is an error.
3340 cp->set_operands(operands);
3341
3342 int operand_fill_index = index_size;
3343 const int cp_size = cp->length();
3344
3345 for (int n = 0; n < attribute_array_length; n++) {
3346 // Store a 32-bit offset into the header of the operand array.
3347 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3348
3349 // Read a bootstrap specifier.
3350 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3351 const u2 bootstrap_method_index = cfs->get_u2_fast();
3352 const u2 argument_count = cfs->get_u2_fast();
3353 check_property(
3354 valid_cp_range(bootstrap_method_index, cp_size) &&
3355 cp->tag_at(bootstrap_method_index).is_method_handle(),
3356 "bootstrap_method_index %u has bad constant type in class file %s",
3357 bootstrap_method_index,
3358 CHECK);
3359
3360 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3361 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3362 CHECK);
3363
3364 operands->at_put(operand_fill_index++, bootstrap_method_index);
3365 operands->at_put(operand_fill_index++, argument_count);
3366
3367 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3368 for (int j = 0; j < argument_count; j++) {
3369 const u2 argument_index = cfs->get_u2_fast();
3370 check_property(
3371 valid_cp_range(argument_index, cp_size) &&
3372 cp->tag_at(argument_index).is_loadable_constant(),
3373 "argument_index %u has bad constant type in class file %s",
3374 argument_index,
3375 CHECK);
3376 operands->at_put(operand_fill_index++, argument_index);
3377 }
3378 }
3379 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3380 "Bad length on BootstrapMethods in class file %s",
3381 CHECK);
3382 }
3383
3384 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3385 ConstantPool* cp,
3386 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3387 TRAPS) {
3388 assert(cfs != NULL, "invariant");
3389 assert(cp != NULL, "invariant");
3390 assert(parsed_annotations != NULL, "invariant");
3391
3392 // Set inner classes attribute to default sentinel
3393 _inner_classes = Universe::the_empty_short_array();
3394 // Set nest members attribute to default sentinel
3395 _nest_members = Universe::the_empty_short_array();
3396 cfs->guarantee_more(2, CHECK); // attributes_count
3397 u2 attributes_count = cfs->get_u2_fast();
3398 bool parsed_sourcefile_attribute = false;
3399 bool parsed_innerclasses_attribute = false;
3400 bool parsed_nest_members_attribute = false;
3401 bool parsed_nest_host_attribute = false;
3402 bool parsed_enclosingmethod_attribute = false;
3403 bool parsed_bootstrap_methods_attribute = false;
3404 const u1* runtime_visible_annotations = NULL;
3405 int runtime_visible_annotations_length = 0;
3406 const u1* runtime_invisible_annotations = NULL;
3407 int runtime_invisible_annotations_length = 0;
3408 const u1* runtime_visible_type_annotations = NULL;
3409 int runtime_visible_type_annotations_length = 0;
3410 const u1* runtime_invisible_type_annotations = NULL;
3411 int runtime_invisible_type_annotations_length = 0;
3412 bool runtime_invisible_type_annotations_exists = false;
3413 bool runtime_invisible_annotations_exists = false;
3414 bool parsed_source_debug_ext_annotations_exist = false;
3415 const u1* inner_classes_attribute_start = NULL;
3416 u4 inner_classes_attribute_length = 0;
3417 const u1* value_types_attribute_start = NULL;
3418 u4 value_types_attribute_length = 0;
3419 u2 enclosing_method_class_index = 0;
3420 u2 enclosing_method_method_index = 0;
3421 const u1* nest_members_attribute_start = NULL;
3422 u4 nest_members_attribute_length = 0;
3423
3424 // Iterate over attributes
3425 while (attributes_count--) {
3426 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3427 const u2 attribute_name_index = cfs->get_u2_fast();
3428 const u4 attribute_length = cfs->get_u4_fast();
3429 check_property(
3430 valid_symbol_at(attribute_name_index),
3431 "Attribute name has bad constant pool index %u in class file %s",
3432 attribute_name_index, CHECK);
3433 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3434 if (tag == vmSymbols::tag_source_file()) {
3435 // Check for SourceFile tag
3436 if (_need_verify) {
3437 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3438 }
3439 if (parsed_sourcefile_attribute) {
3440 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3441 } else {
3442 parsed_sourcefile_attribute = true;
3443 }
3444 parse_classfile_sourcefile_attribute(cfs, CHECK);
3445 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3446 // Check for SourceDebugExtension tag
3447 if (parsed_source_debug_ext_annotations_exist) {
3448 classfile_parse_error(
3449 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3450 }
3451 parsed_source_debug_ext_annotations_exist = true;
3452 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3453 } else if (tag == vmSymbols::tag_inner_classes()) {
3454 // Check for InnerClasses tag
3455 if (parsed_innerclasses_attribute) {
3456 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3457 } else {
3458 parsed_innerclasses_attribute = true;
3459 }
3460 inner_classes_attribute_start = cfs->current();
3461 inner_classes_attribute_length = attribute_length;
3462 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3463 } else if (tag == vmSymbols::tag_synthetic()) {
3464 // Check for Synthetic tag
3465 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3466 if (attribute_length != 0) {
3467 classfile_parse_error(
3468 "Invalid Synthetic classfile attribute length %u in class file %s",
3469 attribute_length, CHECK);
3470 }
3471 parse_classfile_synthetic_attribute(CHECK);
3472 } else if (tag == vmSymbols::tag_deprecated()) {
3473 // Check for Deprecatd tag - 4276120
3474 if (attribute_length != 0) {
3475 classfile_parse_error(
3476 "Invalid Deprecated classfile attribute length %u in class file %s",
3477 attribute_length, CHECK);
3478 }
3479 } else if (_major_version >= JAVA_1_5_VERSION) {
3480 if (tag == vmSymbols::tag_signature()) {
3481 if (_generic_signature_index != 0) {
3482 classfile_parse_error(
3483 "Multiple Signature attributes in class file %s", CHECK);
3484 }
3485 if (attribute_length != 2) {
3486 classfile_parse_error(
3487 "Wrong Signature attribute length %u in class file %s",
3488 attribute_length, CHECK);
3489 }
3490 parse_classfile_signature_attribute(cfs, CHECK);
3491 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3492 if (runtime_visible_annotations != NULL) {
3493 classfile_parse_error(
3494 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3495 }
3496 runtime_visible_annotations_length = attribute_length;
3497 runtime_visible_annotations = cfs->current();
3498 assert(runtime_visible_annotations != NULL, "null visible annotations");
3499 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3500 parse_annotations(cp,
3501 runtime_visible_annotations,
3502 runtime_visible_annotations_length,
3503 parsed_annotations,
3504 _loader_data,
3505 CHECK);
3506 cfs->skip_u1_fast(runtime_visible_annotations_length);
3507 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3508 if (runtime_invisible_annotations_exists) {
3509 classfile_parse_error(
3510 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3511 }
3512 runtime_invisible_annotations_exists = true;
3513 if (PreserveAllAnnotations) {
3514 runtime_invisible_annotations_length = attribute_length;
3515 runtime_invisible_annotations = cfs->current();
3516 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3517 }
3518 cfs->skip_u1(attribute_length, CHECK);
3519 } else if (tag == vmSymbols::tag_enclosing_method()) {
3520 if (parsed_enclosingmethod_attribute) {
3521 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3522 } else {
3523 parsed_enclosingmethod_attribute = true;
3524 }
3525 guarantee_property(attribute_length == 4,
3526 "Wrong EnclosingMethod attribute length %u in class file %s",
3527 attribute_length, CHECK);
3528 cfs->guarantee_more(4, CHECK); // class_index, method_index
3529 enclosing_method_class_index = cfs->get_u2_fast();
3530 enclosing_method_method_index = cfs->get_u2_fast();
3531 if (enclosing_method_class_index == 0) {
3532 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3533 }
3534 // Validate the constant pool indices and types
3535 check_property(valid_klass_reference_at(enclosing_method_class_index),
3536 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3537 if (enclosing_method_method_index != 0 &&
3538 (!cp->is_within_bounds(enclosing_method_method_index) ||
3539 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3540 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3541 }
3542 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3543 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3544 if (parsed_bootstrap_methods_attribute) {
3545 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3546 }
3547 parsed_bootstrap_methods_attribute = true;
3548 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3549 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3550 if (runtime_visible_type_annotations != NULL) {
3551 classfile_parse_error(
3552 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3553 }
3554 runtime_visible_type_annotations_length = attribute_length;
3555 runtime_visible_type_annotations = cfs->current();
3556 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3557 // No need for the VM to parse Type annotations
3558 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3559 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3560 if (runtime_invisible_type_annotations_exists) {
3561 classfile_parse_error(
3562 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3563 } else {
3564 runtime_invisible_type_annotations_exists = true;
3565 }
3566 if (PreserveAllAnnotations) {
3567 runtime_invisible_type_annotations_length = attribute_length;
3568 runtime_invisible_type_annotations = cfs->current();
3569 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3570 }
3571 cfs->skip_u1(attribute_length, CHECK);
3572 } else if (_major_version >= JAVA_11_VERSION) {
3573 if (tag == vmSymbols::tag_nest_members()) {
3574 // Check for NestMembers tag
3575 if (parsed_nest_members_attribute) {
3576 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3577 } else {
3578 parsed_nest_members_attribute = true;
3579 }
3580 if (parsed_nest_host_attribute) {
3581 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3582 }
3583 nest_members_attribute_start = cfs->current();
3584 nest_members_attribute_length = attribute_length;
3585 cfs->skip_u1(nest_members_attribute_length, CHECK);
3586 } else if (tag == vmSymbols::tag_nest_host()) {
3587 if (parsed_nest_host_attribute) {
3588 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3589 } else {
3590 parsed_nest_host_attribute = true;
3591 }
3592 if (parsed_nest_members_attribute) {
3593 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3594 }
3595 if (_need_verify) {
3596 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3597 }
3598 cfs->guarantee_more(2, CHECK);
3599 u2 class_info_index = cfs->get_u2_fast();
3600 check_property(
3601 valid_klass_reference_at(class_info_index),
3602 "Nest-host class_info_index %u has bad constant type in class file %s",
3603 class_info_index, CHECK);
3604 _nest_host = class_info_index;
3605 } else {
3606 // Unknown attribute
3607 cfs->skip_u1(attribute_length, CHECK);
3608 }
3609 } else {
3610 // Unknown attribute
3611 cfs->skip_u1(attribute_length, CHECK);
3612 }
3613 } else {
3614 // Unknown attribute
3615 cfs->skip_u1(attribute_length, CHECK);
3616 }
3617 }
3618 _annotations = assemble_annotations(runtime_visible_annotations,
3619 runtime_visible_annotations_length,
3620 runtime_invisible_annotations,
3621 runtime_invisible_annotations_length,
3622 CHECK);
3623 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3624 runtime_visible_type_annotations_length,
3625 runtime_invisible_type_annotations,
3626 runtime_invisible_type_annotations_length,
3627 CHECK);
3628
3629 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3630 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3631 cfs,
3632 inner_classes_attribute_start,
3633 parsed_innerclasses_attribute,
3634 enclosing_method_class_index,
3635 enclosing_method_method_index,
3636 CHECK);
3637 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3638 guarantee_property(
3639 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3640 "Wrong InnerClasses attribute length in class file %s", CHECK);
3641 }
3642 }
3643
3644 if (parsed_nest_members_attribute) {
3645 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3646 cfs,
3647 nest_members_attribute_start,
3648 CHECK);
3649 if (_need_verify) {
3650 guarantee_property(
3651 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3652 "Wrong NestMembers attribute length in class file %s", CHECK);
3653 }
3654 }
3655
3656 if (_max_bootstrap_specifier_index >= 0) {
3657 guarantee_property(parsed_bootstrap_methods_attribute,
3658 "Missing BootstrapMethods attribute in class file %s", CHECK);
3659 }
3660 }
3661
3662 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3663 assert(k != NULL, "invariant");
3664
3665 if (_synthetic_flag)
3666 k->set_is_synthetic();
3667 if (_sourcefile_index != 0) {
3668 k->set_source_file_name_index(_sourcefile_index);
3669 }
3670 if (_generic_signature_index != 0) {
3671 k->set_generic_signature_index(_generic_signature_index);
3672 }
3673 if (_sde_buffer != NULL) {
3674 k->set_source_debug_extension(_sde_buffer, _sde_length);
3675 }
3676 }
3677
3678 // Create the Annotations object that will
3679 // hold the annotations array for the Klass.
3680 void ClassFileParser::create_combined_annotations(TRAPS) {
3681 if (_annotations == NULL &&
3682 _type_annotations == NULL &&
3683 _fields_annotations == NULL &&
3684 _fields_type_annotations == NULL) {
3685 // Don't create the Annotations object unnecessarily.
3686 return;
3687 }
3688
3689 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3690 annotations->set_class_annotations(_annotations);
3691 annotations->set_class_type_annotations(_type_annotations);
3692 annotations->set_fields_annotations(_fields_annotations);
3693 annotations->set_fields_type_annotations(_fields_type_annotations);
3694
3695 // This is the Annotations object that will be
3696 // assigned to InstanceKlass being constructed.
3697 _combined_annotations = annotations;
3698
3699 // The annotations arrays below has been transfered the
3700 // _combined_annotations so these fields can now be cleared.
3701 _annotations = NULL;
3702 _type_annotations = NULL;
3703 _fields_annotations = NULL;
3704 _fields_type_annotations = NULL;
3705 }
3706
3707 // Transfer ownership of metadata allocated to the InstanceKlass.
3708 void ClassFileParser::apply_parsed_class_metadata(
3709 InstanceKlass* this_klass,
3710 int java_fields_count, TRAPS) {
3711 assert(this_klass != NULL, "invariant");
3712
3713 _cp->set_pool_holder(this_klass);
3714 this_klass->set_constants(_cp);
3715 this_klass->set_fields(_fields, java_fields_count);
3716 this_klass->set_methods(_methods);
3717 this_klass->set_inner_classes(_inner_classes);
3718 this_klass->set_nest_members(_nest_members);
3719 this_klass->set_nest_host_index(_nest_host);
3720 this_klass->set_local_interfaces(_local_interfaces);
3721 this_klass->set_annotations(_combined_annotations);
3722 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3723 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3724 // its _super. If an OOM occurs while loading the current klass, its _super field
3725 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3726 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3727 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3728
3729 // Clear out these fields so they don't get deallocated by the destructor
3730 clear_class_metadata();
3731 }
3732
3733 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3734 int runtime_visible_annotations_length,
3735 const u1* const runtime_invisible_annotations,
3736 int runtime_invisible_annotations_length,
3737 TRAPS) {
3738 AnnotationArray* annotations = NULL;
3739 if (runtime_visible_annotations != NULL ||
3740 runtime_invisible_annotations != NULL) {
3741 annotations = MetadataFactory::new_array<u1>(_loader_data,
3742 runtime_visible_annotations_length +
3743 runtime_invisible_annotations_length,
3744 CHECK_(annotations));
3745 if (runtime_visible_annotations != NULL) {
3746 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3747 annotations->at_put(i, runtime_visible_annotations[i]);
3748 }
3749 }
3750 if (runtime_invisible_annotations != NULL) {
3751 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3752 int append = runtime_visible_annotations_length+i;
3753 annotations->at_put(append, runtime_invisible_annotations[i]);
3754 }
3755 }
3756 }
3757 return annotations;
3758 }
3759
3760 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3761 const int super_class_index,
3762 const bool need_verify,
3763 TRAPS) {
3764 assert(cp != NULL, "invariant");
3765 const InstanceKlass* super_klass = NULL;
3766
3767 if (super_class_index == 0) {
3768 check_property(_class_name == vmSymbols::java_lang_Object()
3769 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3770 "Invalid superclass index %u in class file %s",
3771 super_class_index,
3772 CHECK_NULL);
3773 } else {
3774 check_property(valid_klass_reference_at(super_class_index),
3775 "Invalid superclass index %u in class file %s",
3776 super_class_index,
3777 CHECK_NULL);
3778 // The class name should be legal because it is checked when parsing constant pool.
3779 // However, make sure it is not an array type.
3780 bool is_array = false;
3781 if (cp->tag_at(super_class_index).is_klass()) {
3782 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3783 if (need_verify)
3784 is_array = super_klass->is_array_klass();
3785 } else if (need_verify) {
3786 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3787 }
3788 if (need_verify) {
3789 guarantee_property(!is_array,
3790 "Bad superclass name in class file %s", CHECK_NULL);
3791 }
3792 }
3793 return super_klass;
3794 }
3795
3796 #ifndef PRODUCT
3797 static void print_field_layout(const Symbol* name,
3798 Array<u2>* fields,
3799 const constantPoolHandle& cp,
3800 int instance_size,
3801 int instance_fields_start,
3802 int instance_fields_end,
3803 int static_fields_end) {
3804
3805 assert(name != NULL, "invariant");
3806
3807 tty->print("%s: field layout\n", name->as_klass_external_name());
3808 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3809 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3810 if (!fs.access_flags().is_static()) {
3811 tty->print(" @%3d \"%s\" %s\n",
3812 fs.offset(),
3813 fs.name()->as_klass_external_name(),
3814 fs.signature()->as_klass_external_name());
3815 }
3816 }
3817 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3818 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3819 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3820 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3821 if (fs.access_flags().is_static()) {
3822 tty->print(" @%3d \"%s\" %s\n",
3823 fs.offset(),
3824 fs.name()->as_klass_external_name(),
3825 fs.signature()->as_klass_external_name());
3826 }
3827 }
3828 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3829 tty->print("\n");
3830 }
3831 #endif
3832
3833 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3834 max_nonstatic_oop_maps = max_blocks;
3835 nonstatic_oop_map_count = 0;
3836 if (max_blocks == 0) {
3837 nonstatic_oop_maps = NULL;
3838 } else {
3839 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3840 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3841 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3842 }
3843 }
3844
3845 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3846 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3847 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3848 }
3849
3850 // addition of super oop maps
3851 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3852 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3853 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3854
3855 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3856 nonstatic_oop_map_count += nof_blocks;
3857 }
3858
3859 // collection of oops
3860 void OopMapBlocksBuilder::add(int offset, int count) {
3861 if (nonstatic_oop_map_count == 0) {
3862 nonstatic_oop_map_count++;
3863 }
3864 OopMapBlock* nonstatic_oop_map = last_oop_map();
3865 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3866 nonstatic_oop_map->set_offset(offset);
3867 nonstatic_oop_map->set_count(count);
3868 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3869 nonstatic_oop_map->increment_count(count);
3870 } else { // Need a new one...
3871 nonstatic_oop_map_count++;
3872 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3873 nonstatic_oop_map = last_oop_map();
3874 nonstatic_oop_map->set_offset(offset);
3875 nonstatic_oop_map->set_count(count);
3876 }
3877 }
3878
3879 // general purpose copy, e.g. into allocated instanceKlass
3880 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
3881 if (nonstatic_oop_map_count != 0) {
3882 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3883 }
3884 }
3885
3886 // Sort and compact adjacent blocks
3887 void OopMapBlocksBuilder::compact(TRAPS) {
3888 if (nonstatic_oop_map_count <= 1) {
3889 return;
3890 }
3891 /*
3892 * Since field layout sneeks in oops before values, we will be able to condense
3893 * blocks. There is potential to compact between super, own refs and values
3894 * containing refs.
3895 *
3896 * Currently compaction is slightly limited due to values being 8 byte aligned.
3897 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3898 * and maybe it doesn't need to be.
3899 */
3900 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3901 (_sort_Fn)OopMapBlock::compare_offset);
3902 if (nonstatic_oop_map_count < 2) {
3903 return;
3904 }
3905
3906 //Make a temp copy, and iterate through and copy back into the orig
3907 ResourceMark rm(THREAD);
3908 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3909 nonstatic_oop_map_count);
3910 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3911 copy(oop_maps_copy);
3912 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3913 unsigned int new_count = 1;
3914 oop_maps_copy++;
3915 while(oop_maps_copy < oop_maps_copy_end) {
3916 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3917 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3918 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3919 } else {
3920 nonstatic_oop_map++;
3921 new_count++;
3922 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3923 nonstatic_oop_map->set_count(oop_maps_copy->count());
3924 }
3925 oop_maps_copy++;
3926 }
3927 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3928 nonstatic_oop_map_count = new_count;
3929 }
3930
3931 void OopMapBlocksBuilder::print_on(outputStream* st) const {
3932 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3933 if (nonstatic_oop_map_count > 0) {
3934 OopMapBlock* map = nonstatic_oop_maps;
3935 OopMapBlock* last_map = last_oop_map();
3936 assert(map <= last_map, "Last less than first");
3937 while (map <= last_map) {
3938 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3939 map->offset() + map->offset_span() - heapOopSize, map->count());
3940 map++;
3941 }
3942 }
3943 }
3944
3945 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
3946 print_on(st);
3947 }
3948
3949 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3950 const char* msg,
3951 const Symbol* name,
3952 const Symbol* sig) const {
3953
3954 ResourceMark rm(THREAD);
3955 if (name == NULL || sig == NULL) {
3956 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3957 vmSymbols::java_lang_ClassFormatError(),
3958 "class: %s - %s", _class_name->as_C_string(), msg);
3959 }
3960 else {
3961 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3962 vmSymbols::java_lang_ClassFormatError(),
3963 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3964 _class_name->as_C_string(), msg);
3965 }
3966 }
3967
3968 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3969 void ClassFileParser::layout_fields(ConstantPool* cp,
3970 const FieldAllocationCount* fac,
3971 const ClassAnnotationCollector* parsed_annotations,
3972 FieldLayoutInfo* info,
3973 TRAPS) {
3974
3975 assert(cp != NULL, "invariant");
3976
3977 // Field size and offset computation
3978 int nonstatic_field_size = _super_klass == NULL ? 0 :
3979 _super_klass->nonstatic_field_size();
3980 int next_nonstatic_valuetype_offset = 0;
3981 int first_nonstatic_valuetype_offset = 0;
3982
3983 // Fields that are value types are handled differently depending if they are static or not:
3984 // - static fields are oops
3985 // - non-static fields are embedded
3986
3987 // Count the contended fields by type.
3988 //
3989 // We ignore static fields, because @Contended is not supported for them.
3990 // The layout code below will also ignore the static fields.
3991 int nonstatic_contended_count = 0;
3992 FieldAllocationCount fac_contended;
3993 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3994 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3995 if (fs.is_contended()) {
3996 fac_contended.count[atype]++;
3997 if (!fs.access_flags().is_static()) {
3998 nonstatic_contended_count++;
3999 }
4000 }
4001 }
4002
4003
4004 // Calculate the starting byte offsets
4005 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4006 // Value types in static fields are not embedded, they are handled with oops
4007 int next_static_double_offset = next_static_oop_offset +
4008 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4009 if (fac->count[STATIC_DOUBLE]) {
4010 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4011 }
4012
4013 int next_static_word_offset = next_static_double_offset +
4014 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4015 int next_static_short_offset = next_static_word_offset +
4016 ((fac->count[STATIC_WORD]) * BytesPerInt);
4017 int next_static_byte_offset = next_static_short_offset +
4018 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4019
4020 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4021 nonstatic_field_size * heapOopSize;
4022
4023 // First field of value types is aligned on a long boundary in order to ease
4024 // in-lining of value types (with header removal) in packed arrays and
4025 // flatten value types
4026 int initial_value_type_padding = 0;
4027 if (is_value_type()) {
4028 int old = nonstatic_fields_start;
4029 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4030 initial_value_type_padding = nonstatic_fields_start - old;
4031 }
4032
4033 int next_nonstatic_field_offset = nonstatic_fields_start;
4034
4035 const bool is_contended_class = parsed_annotations->is_contended();
4036
4037 // Class is contended, pad before all the fields
4038 if (is_contended_class) {
4039 next_nonstatic_field_offset += ContendedPaddingWidth;
4040 }
4041
4042 // Temporary value types restrictions
4043 if (is_value_type()) {
4044 if (is_contended_class) {
4045 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4046 return;
4047 }
4048 }
4049
4050 // Compute the non-contended fields count.
4051 // The packing code below relies on these counts to determine if some field
4052 // can be squeezed into the alignment gap. Contended fields are obviously
4053 // exempt from that.
4054 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4055 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4056 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4057 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4058 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4059
4060 int static_value_type_count = 0;
4061 int nonstatic_value_type_count = 0;
4062 int* nonstatic_value_type_indexes = NULL;
4063 Klass** nonstatic_value_type_klasses = NULL;
4064 unsigned int value_type_oop_map_count = 0;
4065 int not_flattened_value_types = 0;
4066
4067 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4068
4069 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4070 max_nonstatic_value_type);
4071 for (int i = 0; i < max_nonstatic_value_type; i++) {
4072 nonstatic_value_type_indexes[i] = -1;
4073 }
4074 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4075 max_nonstatic_value_type);
4076
4077 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4078 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4079 // Pre-resolve the flattenable field and check for value type circularity
4080 // issues. Note that super-class circularity checks are not needed here
4081 // because flattenable fields can only be in value types and value types
4082 // only have java.lang.Object as their super class.
4083 // Also, note that super-interface circularity checks are not needed
4084 // because interfaces cannot be value types.
4085 ResourceMark rm;
4086 if (!fs.signature()->is_Q_signature()) {
4087 THROW(vmSymbols::java_lang_ClassFormatError());
4088 }
4089 Klass* klass =
4090 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4091 Handle(THREAD, _loader_data->class_loader()),
4092 _protection_domain, true, CHECK);
4093 assert(klass != NULL, "Sanity check");
4094 if (!klass->access_flags().is_value_type()) {
4095 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4096 }
4097 static_value_type_count++;
4098 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4099 // Pre-resolve the flattenable field and check for value type circularity issues.
4100 ResourceMark rm;
4101 if (!fs.signature()->is_Q_signature()) {
4102 THROW(vmSymbols::java_lang_ClassFormatError());
4103 }
4104 Klass* klass =
4105 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4106 Handle(THREAD, _loader_data->class_loader()),
4107 _protection_domain, true, CHECK);
4108 assert(klass != NULL, "Sanity check");
4109 if (!klass->access_flags().is_value_type()) {
4110 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4111 }
4112 ValueKlass* vk = ValueKlass::cast(klass);
4113 // Conditions to apply flattening or not should be defined in a single place
4114 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4115 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4116 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4117 nonstatic_value_type_count++;
4118
4119 ValueKlass* vklass = ValueKlass::cast(klass);
4120 if (vklass->contains_oops()) {
4121 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4122 }
4123 fs.set_flattened(true);
4124 } else {
4125 not_flattened_value_types++;
4126 fs.set_flattened(false);
4127 }
4128 }
4129 }
4130
4131 // Adjusting non_static_oop_count to take into account not flattened value types;
4132 nonstatic_oop_count += not_flattened_value_types;
4133
4134 // Total non-static fields count, including every contended field
4135 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4136 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4137 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4138
4139 const bool super_has_nonstatic_fields =
4140 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4141 const bool has_nonstatic_fields =
4142 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4143 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4144
4145 if (is_value_type() && (!has_nonstatic_fields)) {
4146 // There are a number of fixes required throughout the type system and JIT
4147 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4148 return;
4149 }
4150
4151 // Prepare list of oops for oop map generation.
4152 //
4153 // "offset" and "count" lists are describing the set of contiguous oop
4154 // regions. offset[i] is the start of the i-th region, which then has
4155 // count[i] oops following. Before we know how many regions are required,
4156 // we pessimistically allocate the maps to fit all the oops into the
4157 // distinct regions.
4158 //
4159 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4160 int max_oop_map_count =
4161 super_oop_map_count +
4162 fac->count[NONSTATIC_OOP] +
4163 value_type_oop_map_count +
4164 not_flattened_value_types;
4165
4166 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4167 if (super_oop_map_count > 0) {
4168 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4169 _super_klass->nonstatic_oop_map_count());
4170 }
4171
4172 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4173
4174 bool compact_fields = CompactFields;
4175 int allocation_style = FieldsAllocationStyle;
4176 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4177 assert(false, "0 <= FieldsAllocationStyle <= 2");
4178 allocation_style = 1; // Optimistic
4179 }
4180
4181 // The next classes have predefined hard-coded fields offsets
4182 // (see in JavaClasses::compute_hard_coded_offsets()).
4183 // Use default fields allocation order for them.
4184 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4185 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4186 _class_name == vmSymbols::java_lang_Class() ||
4187 _class_name == vmSymbols::java_lang_ClassLoader() ||
4188 _class_name == vmSymbols::java_lang_ref_Reference() ||
4189 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4190 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4191 _class_name == vmSymbols::java_lang_String() ||
4192 _class_name == vmSymbols::java_lang_Throwable() ||
4193 _class_name == vmSymbols::java_lang_Boolean() ||
4194 _class_name == vmSymbols::java_lang_Character() ||
4195 _class_name == vmSymbols::java_lang_Float() ||
4196 _class_name == vmSymbols::java_lang_Double() ||
4197 _class_name == vmSymbols::java_lang_Byte() ||
4198 _class_name == vmSymbols::java_lang_Short() ||
4199 _class_name == vmSymbols::java_lang_Integer() ||
4200 _class_name == vmSymbols::java_lang_Long())) {
4201 allocation_style = 0; // Allocate oops first
4202 compact_fields = false; // Don't compact fields
4203 }
4204
4205 int next_nonstatic_oop_offset = 0;
4206 int next_nonstatic_double_offset = 0;
4207
4208 // Rearrange fields for a given allocation style
4209 if( allocation_style == 0 ) {
4210 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4211 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4212 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4213 (nonstatic_oop_count * heapOopSize);
4214 } else if( allocation_style == 1 ) {
4215 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4216 next_nonstatic_double_offset = next_nonstatic_field_offset;
4217 } else if( allocation_style == 2 ) {
4218 // Fields allocation: oops fields in super and sub classes are together.
4219 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4220 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4221 allocation_style = 0; // allocate oops first
4222 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4223 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4224 (nonstatic_oop_count * heapOopSize);
4225 }
4226 }
4227 if( allocation_style == 2 ) {
4228 allocation_style = 1; // allocate oops last
4229 next_nonstatic_double_offset = next_nonstatic_field_offset;
4230 }
4231 } else {
4232 ShouldNotReachHere();
4233 }
4234
4235 int nonstatic_oop_space_count = 0;
4236 int nonstatic_word_space_count = 0;
4237 int nonstatic_short_space_count = 0;
4238 int nonstatic_byte_space_count = 0;
4239 int nonstatic_oop_space_offset = 0;
4240 int nonstatic_word_space_offset = 0;
4241 int nonstatic_short_space_offset = 0;
4242 int nonstatic_byte_space_offset = 0;
4243
4244 // Try to squeeze some of the fields into the gaps due to
4245 // long/double alignment.
4246 if (nonstatic_double_count > 0) {
4247 int offset = next_nonstatic_double_offset;
4248 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4249 if (compact_fields && offset != next_nonstatic_double_offset) {
4250 // Allocate available fields into the gap before double field.
4251 int length = next_nonstatic_double_offset - offset;
4252 assert(length == BytesPerInt, "");
4253 nonstatic_word_space_offset = offset;
4254 if (nonstatic_word_count > 0) {
4255 nonstatic_word_count -= 1;
4256 nonstatic_word_space_count = 1; // Only one will fit
4257 length -= BytesPerInt;
4258 offset += BytesPerInt;
4259 }
4260 nonstatic_short_space_offset = offset;
4261 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4262 nonstatic_short_count -= 1;
4263 nonstatic_short_space_count += 1;
4264 length -= BytesPerShort;
4265 offset += BytesPerShort;
4266 }
4267 nonstatic_byte_space_offset = offset;
4268 while (length > 0 && nonstatic_byte_count > 0) {
4269 nonstatic_byte_count -= 1;
4270 nonstatic_byte_space_count += 1;
4271 length -= 1;
4272 }
4273 // Allocate oop field in the gap if there are no other fields for that.
4274 nonstatic_oop_space_offset = offset;
4275 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4276 allocation_style != 0) { // when oop fields not first
4277 nonstatic_oop_count -= 1;
4278 nonstatic_oop_space_count = 1; // Only one will fit
4279 length -= heapOopSize;
4280 offset += heapOopSize;
4281 }
4282 }
4283 }
4284
4285 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4286 (nonstatic_double_count * BytesPerLong);
4287 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4288 (nonstatic_word_count * BytesPerInt);
4289 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4290 (nonstatic_short_count * BytesPerShort);
4291 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4292 nonstatic_byte_count;
4293
4294 // let oops jump before padding with this allocation style
4295 if( allocation_style == 1 ) {
4296 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4297 if( nonstatic_oop_count > 0 ) {
4298 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4299 }
4300 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4301 }
4302
4303 // Aligning embedded value types
4304 // bug below, the current algorithm to layout embedded value types always put them at the
4305 // end of the layout, which doesn't match the different allocation policies the VM is
4306 // supposed to provide => FixMe
4307 // Note also that the current alignment policy is to make each value type starting on a
4308 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4309 // align value types according to their most constrained internal type.
4310 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4311 int next_value_type_index = 0;
4312
4313 // Iterate over fields again and compute correct offsets.
4314 // The field allocation type was temporarily stored in the offset slot.
4315 // oop fields are located before non-oop fields (static and non-static).
4316 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4317
4318 // skip already laid out fields
4319 if (fs.is_offset_set()) continue;
4320
4321 // contended instance fields are handled below
4322 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4323
4324 int real_offset = 0;
4325 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4326
4327 // pack the rest of the fields
4328 switch (atype) {
4329 // Value types in static fields are handled with oops
4330 case STATIC_FLATTENABLE: // Fallthrough
4331 case STATIC_OOP:
4332 real_offset = next_static_oop_offset;
4333 next_static_oop_offset += heapOopSize;
4334 break;
4335 case STATIC_BYTE:
4336 real_offset = next_static_byte_offset;
4337 next_static_byte_offset += 1;
4338 break;
4339 case STATIC_SHORT:
4340 real_offset = next_static_short_offset;
4341 next_static_short_offset += BytesPerShort;
4342 break;
4343 case STATIC_WORD:
4344 real_offset = next_static_word_offset;
4345 next_static_word_offset += BytesPerInt;
4346 break;
4347 case STATIC_DOUBLE:
4348 real_offset = next_static_double_offset;
4349 next_static_double_offset += BytesPerLong;
4350 break;
4351 case NONSTATIC_FLATTENABLE:
4352 if (fs.is_flattened()) {
4353 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4354 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4355 assert(klass->access_flags().is_value_type(),"Must be a value type");
4356 ValueKlass* vklass = ValueKlass::cast(klass);
4357 real_offset = next_nonstatic_valuetype_offset;
4358 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4359 // aligning next value type on a 64 bits boundary
4360 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4361 next_value_type_index += 1;
4362
4363 if (vklass->contains_oops()) { // add flatten oop maps
4364 int diff = real_offset - vklass->first_field_offset();
4365 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4366 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4367 while (map < last_map) {
4368 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4369 map++;
4370 }
4371 }
4372 break;
4373 } else {
4374 // Fall through
4375 }
4376 case NONSTATIC_OOP:
4377 if( nonstatic_oop_space_count > 0 ) {
4378 real_offset = nonstatic_oop_space_offset;
4379 nonstatic_oop_space_offset += heapOopSize;
4380 nonstatic_oop_space_count -= 1;
4381 } else {
4382 real_offset = next_nonstatic_oop_offset;
4383 next_nonstatic_oop_offset += heapOopSize;
4384 }
4385 nonstatic_oop_maps->add(real_offset, 1);
4386 break;
4387 case NONSTATIC_BYTE:
4388 if( nonstatic_byte_space_count > 0 ) {
4389 real_offset = nonstatic_byte_space_offset;
4390 nonstatic_byte_space_offset += 1;
4391 nonstatic_byte_space_count -= 1;
4392 } else {
4393 real_offset = next_nonstatic_byte_offset;
4394 next_nonstatic_byte_offset += 1;
4395 }
4396 break;
4397 case NONSTATIC_SHORT:
4398 if( nonstatic_short_space_count > 0 ) {
4399 real_offset = nonstatic_short_space_offset;
4400 nonstatic_short_space_offset += BytesPerShort;
4401 nonstatic_short_space_count -= 1;
4402 } else {
4403 real_offset = next_nonstatic_short_offset;
4404 next_nonstatic_short_offset += BytesPerShort;
4405 }
4406 break;
4407 case NONSTATIC_WORD:
4408 if( nonstatic_word_space_count > 0 ) {
4409 real_offset = nonstatic_word_space_offset;
4410 nonstatic_word_space_offset += BytesPerInt;
4411 nonstatic_word_space_count -= 1;
4412 } else {
4413 real_offset = next_nonstatic_word_offset;
4414 next_nonstatic_word_offset += BytesPerInt;
4415 }
4416 break;
4417 case NONSTATIC_DOUBLE:
4418 real_offset = next_nonstatic_double_offset;
4419 next_nonstatic_double_offset += BytesPerLong;
4420 break;
4421 default:
4422 ShouldNotReachHere();
4423 }
4424 fs.set_offset(real_offset);
4425 }
4426
4427
4428 // Handle the contended cases.
4429 //
4430 // Each contended field should not intersect the cache line with another contended field.
4431 // In the absence of alignment information, we end up with pessimistically separating
4432 // the fields with full-width padding.
4433 //
4434 // Additionally, this should not break alignment for the fields, so we round the alignment up
4435 // for each field.
4436 if (nonstatic_contended_count > 0) {
4437
4438 // if there is at least one contended field, we need to have pre-padding for them
4439 next_nonstatic_padded_offset += ContendedPaddingWidth;
4440
4441 // collect all contended groups
4442 ResourceBitMap bm(cp->size());
4443 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4444 // skip already laid out fields
4445 if (fs.is_offset_set()) continue;
4446
4447 if (fs.is_contended()) {
4448 bm.set_bit(fs.contended_group());
4449 }
4450 }
4451
4452 int current_group = -1;
4453 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4454
4455 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4456
4457 // skip already laid out fields
4458 if (fs.is_offset_set()) continue;
4459
4460 // skip non-contended fields and fields from different group
4461 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4462
4463 // handle statics below
4464 if (fs.access_flags().is_static()) continue;
4465
4466 int real_offset = 0;
4467 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4468
4469 switch (atype) {
4470 case NONSTATIC_BYTE:
4471 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4472 real_offset = next_nonstatic_padded_offset;
4473 next_nonstatic_padded_offset += 1;
4474 break;
4475
4476 case NONSTATIC_SHORT:
4477 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4478 real_offset = next_nonstatic_padded_offset;
4479 next_nonstatic_padded_offset += BytesPerShort;
4480 break;
4481
4482 case NONSTATIC_WORD:
4483 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4484 real_offset = next_nonstatic_padded_offset;
4485 next_nonstatic_padded_offset += BytesPerInt;
4486 break;
4487
4488 case NONSTATIC_DOUBLE:
4489 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4490 real_offset = next_nonstatic_padded_offset;
4491 next_nonstatic_padded_offset += BytesPerLong;
4492 break;
4493
4494 // Value types in static fields are handled with oops
4495 case NONSTATIC_FLATTENABLE:
4496 throwValueTypeLimitation(THREAD_AND_LOCATION,
4497 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4498 return;
4499
4500 case NONSTATIC_OOP:
4501 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4502 real_offset = next_nonstatic_padded_offset;
4503 next_nonstatic_padded_offset += heapOopSize;
4504 nonstatic_oop_maps->add(real_offset, 1);
4505 break;
4506
4507 default:
4508 ShouldNotReachHere();
4509 }
4510
4511 if (fs.contended_group() == 0) {
4512 // Contended group defines the equivalence class over the fields:
4513 // the fields within the same contended group are not inter-padded.
4514 // The only exception is default group, which does not incur the
4515 // equivalence, and so requires intra-padding.
4516 next_nonstatic_padded_offset += ContendedPaddingWidth;
4517 }
4518
4519 fs.set_offset(real_offset);
4520 } // for
4521
4522 // Start laying out the next group.
4523 // Note that this will effectively pad the last group in the back;
4524 // this is expected to alleviate memory contention effects for
4525 // subclass fields and/or adjacent object.
4526 // If this was the default group, the padding is already in place.
4527 if (current_group != 0) {
4528 next_nonstatic_padded_offset += ContendedPaddingWidth;
4529 }
4530 }
4531
4532 // handle static fields
4533 }
4534
4535 // Entire class is contended, pad in the back.
4536 // This helps to alleviate memory contention effects for subclass fields
4537 // and/or adjacent object.
4538 if (is_contended_class) {
4539 assert(!is_value_type(), "@Contended not supported for value types yet");
4540 next_nonstatic_padded_offset += ContendedPaddingWidth;
4541 }
4542
4543 int notaligned_nonstatic_fields_end;
4544 if (nonstatic_value_type_count != 0) {
4545 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4546 } else {
4547 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4548 }
4549
4550 int nonstatic_field_sz_align = heapOopSize;
4551 if (is_value_type()) {
4552 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4553 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4554 }
4555 }
4556 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4557 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4558 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4559
4560 int static_field_size = (static_fields_end -
4561 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4562 nonstatic_field_size = nonstatic_field_size +
4563 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4564
4565 int instance_size = align_object_size(instance_end / wordSize);
4566
4567 assert(instance_size == align_object_size(align_up(
4568 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4569 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4570
4571
4572 // Invariant: nonstatic_field end/start should only change if there are
4573 // nonstatic fields in the class, or if the class is contended. We compare
4574 // against the non-aligned value, so that end alignment will not fail the
4575 // assert without actually having the fields.
4576 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4577 is_contended_class ||
4578 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4579
4580 // Number of non-static oop map blocks allocated at end of klass.
4581 nonstatic_oop_maps->compact(THREAD);
4582
4583 #ifndef PRODUCT
4584 if ((PrintFieldLayout && !is_value_type()) ||
4585 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4586 print_field_layout(_class_name,
4587 _fields,
4588 cp,
4589 instance_size,
4590 nonstatic_fields_start,
4591 nonstatic_fields_end,
4592 static_fields_end);
4593 nonstatic_oop_maps->print_on(tty);
4594 tty->print("\n");
4595 tty->print_cr("Instance size = %d", instance_size);
4596 tty->print_cr("Nonstatic_field_size = %d", nonstatic_field_size);
4597 tty->print_cr("Static_field_size = %d", static_field_size);
4598 tty->print_cr("Has nonstatic fields = %d", has_nonstatic_fields);
4599 tty->print_cr("---");
4600 }
4601
4602 #endif
4603 // Pass back information needed for InstanceKlass creation
4604 info->oop_map_blocks = nonstatic_oop_maps;
4605 info->instance_size = instance_size;
4606 info->static_field_size = static_field_size;
4607 info->nonstatic_field_size = nonstatic_field_size;
4608 info->has_nonstatic_fields = has_nonstatic_fields;
4609 }
4610
4611 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4612 assert(ik != NULL, "invariant");
4613
4614 const Klass* const super = ik->super();
4615
4616 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4617 // in which case we don't have to register objects as finalizable
4618 if (!_has_empty_finalizer) {
4619 if (_has_finalizer ||
4620 (super != NULL && super->has_finalizer())) {
4621 ik->set_has_finalizer();
4622 }
4623 }
4624
4625 #ifdef ASSERT
4626 bool f = false;
4627 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4628 vmSymbols::void_method_signature());
4629 if (m != NULL && !m->is_empty_method()) {
4630 f = true;
4631 }
4632
4633 // Spec doesn't prevent agent from redefinition of empty finalizer.
4634 // Despite the fact that it's generally bad idea and redefined finalizer
4635 // will not work as expected we shouldn't abort vm in this case
4636 if (!ik->has_redefined_this_or_super()) {
4637 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4638 }
4639 #endif
4640
4641 // Check if this klass supports the java.lang.Cloneable interface
4642 if (SystemDictionary::Cloneable_klass_loaded()) {
4643 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4644 if (ik->is_value()) {
4645 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4646 return;
4647 }
4648 ik->set_is_cloneable();
4649 }
4650 }
4651
4652 // Check if this klass has a vanilla default constructor
4653 if (super == NULL) {
4654 // java.lang.Object has empty default constructor
4655 ik->set_has_vanilla_constructor();
4656 } else {
4657 if (super->has_vanilla_constructor() &&
4658 _has_vanilla_constructor) {
4659 ik->set_has_vanilla_constructor();
4660 }
4661 #ifdef ASSERT
4662 bool v = false;
4663 if (super->has_vanilla_constructor()) {
4664 const Method* const constructor =
4665 ik->find_method(vmSymbols::object_initializer_name(),
4666 vmSymbols::void_method_signature());
4667 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4668 v = true;
4669 }
4670 }
4671 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4672 #endif
4673 }
4674
4675 // If it cannot be fast-path allocated, set a bit in the layout helper.
4676 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4677 assert(ik->size_helper() > 0, "layout_helper is initialized");
4678 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4679 || ik->is_abstract() || ik->is_interface()
4680 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4681 || ik->size_helper() >= FastAllocateSizeLimit) {
4682 // Forbid fast-path allocation.
4683 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4684 ik->set_layout_helper(lh);
4685 }
4686 }
4687
4688 bool ClassFileParser::supports_value_types() const {
4689 // Value types are only supported by class file version 55 and later
4690 return _major_version >= JAVA_11_VERSION;
4691 }
4692
4693 // utility methods for appending an array with check for duplicates
4694
4695 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4696 const Array<InstanceKlass*>* const ifs) {
4697 // iterate over new interfaces
4698 for (int i = 0; i < ifs->length(); i++) {
4699 InstanceKlass* const e = ifs->at(i);
4700 assert(e->is_klass() && e->is_interface(), "just checking");
4701 // add new interface
4702 result->append_if_missing(e);
4703 }
4704 }
4705
4706 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4707 Array<InstanceKlass*>* local_ifs,
4708 ClassLoaderData* loader_data,
4709 TRAPS) {
4710 assert(local_ifs != NULL, "invariant");
4711 assert(loader_data != NULL, "invariant");
4712
4713 // Compute maximum size for transitive interfaces
4714 int max_transitive_size = 0;
4715 int super_size = 0;
4716 // Add superclass transitive interfaces size
4717 if (super != NULL) {
4718 super_size = super->transitive_interfaces()->length();
4719 max_transitive_size += super_size;
4720 }
4721 // Add local interfaces' super interfaces
4722 const int local_size = local_ifs->length();
4723 for (int i = 0; i < local_size; i++) {
4724 InstanceKlass* const l = local_ifs->at(i);
4725 max_transitive_size += l->transitive_interfaces()->length();
4726 }
4727 // Finally add local interfaces
4728 max_transitive_size += local_size;
4729 // Construct array
4730 if (max_transitive_size == 0) {
4731 // no interfaces, use canonicalized array
4732 return Universe::the_empty_instance_klass_array();
4733 } else if (max_transitive_size == super_size) {
4734 // no new local interfaces added, share superklass' transitive interface array
4735 return super->transitive_interfaces();
4736 } else if (max_transitive_size == local_size) {
4737 // only local interfaces added, share local interface array
4738 return local_ifs;
4739 } else {
4740 ResourceMark rm;
4741 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4742
4743 // Copy down from superclass
4744 if (super != NULL) {
4745 append_interfaces(result, super->transitive_interfaces());
4746 }
4747
4748 // Copy down from local interfaces' superinterfaces
4749 for (int i = 0; i < local_size; i++) {
4750 InstanceKlass* const l = local_ifs->at(i);
4751 append_interfaces(result, l->transitive_interfaces());
4752 }
4753 // Finally add local interfaces
4754 append_interfaces(result, local_ifs);
4755
4756 // length will be less than the max_transitive_size if duplicates were removed
4757 const int length = result->length();
4758 assert(length <= max_transitive_size, "just checking");
4759 Array<InstanceKlass*>* const new_result =
4760 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4761 for (int i = 0; i < length; i++) {
4762 InstanceKlass* const e = result->at(i);
4763 assert(e != NULL, "just checking");
4764 new_result->at_put(i, e);
4765 }
4766 return new_result;
4767 }
4768 }
4769
4770 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4771 assert(this_klass != NULL, "invariant");
4772 const Klass* const super = this_klass->super();
4773 if (super != NULL) {
4774
4775 // If the loader is not the boot loader then throw an exception if its
4776 // superclass is in package jdk.internal.reflect and its loader is not a
4777 // special reflection class loader
4778 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4779 assert(super->is_instance_klass(), "super is not instance klass");
4780 PackageEntry* super_package = super->package();
4781 if (super_package != NULL &&
4782 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4783 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4784 ResourceMark rm(THREAD);
4785 Exceptions::fthrow(
4786 THREAD_AND_LOCATION,
4787 vmSymbols::java_lang_IllegalAccessError(),
4788 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4789 this_klass->external_name(),
4790 this_klass->class_loader_data()->loader_name_and_id(),
4791 super->external_name());
4792 return;
4793 }
4794 }
4795
4796 Reflection::VerifyClassAccessResults vca_result =
4797 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4798 if (vca_result != Reflection::ACCESS_OK) {
4799 ResourceMark rm(THREAD);
4800 char* msg = Reflection::verify_class_access_msg(this_klass,
4801 InstanceKlass::cast(super),
4802 vca_result);
4803 if (msg == NULL) {
4804 bool same_module = (this_klass->module() == super->module());
4805 Exceptions::fthrow(
4806 THREAD_AND_LOCATION,
4807 vmSymbols::java_lang_IllegalAccessError(),
4808 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4809 this_klass->external_name(),
4810 super->is_abstract() ? "abstract " : "",
4811 super->external_name(),
4812 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4813 (same_module) ? "" : "; ",
4814 (same_module) ? "" : super->class_in_module_of_loader());
4815 } else {
4816 // Add additional message content.
4817 Exceptions::fthrow(
4818 THREAD_AND_LOCATION,
4819 vmSymbols::java_lang_IllegalAccessError(),
4820 "superclass access check failed: %s",
4821 msg);
4822 }
4823 }
4824 }
4825 }
4826
4827
4828 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4829 assert(this_klass != NULL, "invariant");
4830 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4831 const int lng = local_interfaces->length();
4832 for (int i = lng - 1; i >= 0; i--) {
4833 InstanceKlass* const k = local_interfaces->at(i);
4834 assert (k != NULL && k->is_interface(), "invalid interface");
4835 Reflection::VerifyClassAccessResults vca_result =
4836 Reflection::verify_class_access(this_klass, k, false);
4837 if (vca_result != Reflection::ACCESS_OK) {
4838 ResourceMark rm(THREAD);
4839 char* msg = Reflection::verify_class_access_msg(this_klass,
4840 k,
4841 vca_result);
4842 if (msg == NULL) {
4843 bool same_module = (this_klass->module() == k->module());
4844 Exceptions::fthrow(
4845 THREAD_AND_LOCATION,
4846 vmSymbols::java_lang_IllegalAccessError(),
4847 "class %s cannot access its superinterface %s (%s%s%s)",
4848 this_klass->external_name(),
4849 k->external_name(),
4850 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4851 (same_module) ? "" : "; ",
4852 (same_module) ? "" : k->class_in_module_of_loader());
4853 } else {
4854 // Add additional message content.
4855 Exceptions::fthrow(
4856 THREAD_AND_LOCATION,
4857 vmSymbols::java_lang_IllegalAccessError(),
4858 "superinterface check failed: %s",
4859 msg);
4860 }
4861 }
4862 }
4863 }
4864
4865
4866 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4867 assert(this_klass != NULL, "invariant");
4868 const Array<Method*>* const methods = this_klass->methods();
4869 const int num_methods = methods->length();
4870
4871 // go thru each method and check if it overrides a final method
4872 for (int index = 0; index < num_methods; index++) {
4873 const Method* const m = methods->at(index);
4874
4875 // skip private, static, and <init> methods
4876 if ((!m->is_private() && !m->is_static()) &&
4877 (m->name() != vmSymbols::object_initializer_name())) {
4878
4879 const Symbol* const name = m->name();
4880 const Symbol* const signature = m->signature();
4881 const Klass* k = this_klass->super();
4882 const Method* super_m = NULL;
4883 while (k != NULL) {
4884 // skip supers that don't have final methods.
4885 if (k->has_final_method()) {
4886 // lookup a matching method in the super class hierarchy
4887 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4888 if (super_m == NULL) {
4889 break; // didn't find any match; get out
4890 }
4891
4892 if (super_m->is_final() && !super_m->is_static() &&
4893 !super_m->access_flags().is_private()) {
4894 // matching method in super is final, and not static or private
4895 bool can_access = Reflection::verify_member_access(this_klass,
4896 super_m->method_holder(),
4897 super_m->method_holder(),
4898 super_m->access_flags(),
4899 false, false, CHECK);
4900 if (can_access) {
4901 // this class can access super final method and therefore override
4902 ResourceMark rm(THREAD);
4903 Exceptions::fthrow(THREAD_AND_LOCATION,
4904 vmSymbols::java_lang_VerifyError(),
4905 "class %s overrides final method %s.%s%s",
4906 this_klass->external_name(),
4907 super_m->method_holder()->external_name(),
4908 name->as_C_string(),
4909 signature->as_C_string()
4910 );
4911 return;
4912 }
4913 }
4914
4915 // continue to look from super_m's holder's super.
4916 k = super_m->method_holder()->super();
4917 continue;
4918 }
4919
4920 k = k->super();
4921 }
4922 }
4923 }
4924 }
4925
4926
4927 // assumes that this_klass is an interface
4928 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4929 assert(this_klass != NULL, "invariant");
4930 assert(this_klass->is_interface(), "not an interface");
4931 const Array<Method*>* methods = this_klass->methods();
4932 const int num_methods = methods->length();
4933
4934 for (int index = 0; index < num_methods; index++) {
4935 const Method* const m = methods->at(index);
4936 // if m is static and not the init method, throw a verify error
4937 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4938 ResourceMark rm(THREAD);
4939 Exceptions::fthrow(
4940 THREAD_AND_LOCATION,
4941 vmSymbols::java_lang_VerifyError(),
4942 "Illegal static method %s in interface %s",
4943 m->name()->as_C_string(),
4944 this_klass->external_name()
4945 );
4946 return;
4947 }
4948 }
4949 }
4950
4951 // utility methods for format checking
4952
4953 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4954 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4955 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4956 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4957 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4958 if (is_module) {
4959 ResourceMark rm(THREAD);
4960 Exceptions::fthrow(
4961 THREAD_AND_LOCATION,
4962 vmSymbols::java_lang_NoClassDefFoundError(),
4963 "%s is not a class because access_flag ACC_MODULE is set",
4964 _class_name->as_C_string());
4965 return;
4966 }
4967
4968 if (is_value_type && !EnableValhalla) {
4969 ResourceMark rm(THREAD);
4970 Exceptions::fthrow(
4971 THREAD_AND_LOCATION,
4972 vmSymbols::java_lang_ClassFormatError(),
4973 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4974 _class_name->as_C_string()
4975 );
4976 }
4977
4978 if (!_need_verify) { return; }
4979
4980 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4981 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4982 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4983 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4984 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4985 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4986 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4987
4988 if ((is_abstract && is_final) ||
4989 (is_interface && !is_abstract) ||
4990 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4991 (!is_interface && major_gte_15 && is_annotation) ||
4992 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
4993 ResourceMark rm(THREAD);
4994 const char* class_note = "";
4995 if (is_value_type) class_note = " (an inline class)";
4996 Exceptions::fthrow(
4997 THREAD_AND_LOCATION,
4998 vmSymbols::java_lang_ClassFormatError(),
4999 "Illegal class modifiers in class %s%s: 0x%X",
5000 _class_name->as_C_string(), class_note, flags
5001 );
5002 return;
5003 }
5004 }
5005
5006 static bool has_illegal_visibility(jint flags) {
5007 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5008 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5009 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5010
5011 return ((is_public && is_protected) ||
5012 (is_public && is_private) ||
5013 (is_protected && is_private));
5014 }
5015
5016 // A legal major_version.minor_version must be one of the following:
5017 //
5018 // Major_version >= 45 and major_version < 56, any minor_version.
5019 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
5020 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
5021 //
5022 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5023 ResourceMark rm(THREAD);
5024 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5025 if (major < JAVA_MIN_SUPPORTED_VERSION) {
5026 Exceptions::fthrow(
5027 THREAD_AND_LOCATION,
5028 vmSymbols::java_lang_UnsupportedClassVersionError(),
5029 "%s (class file version %u.%u) was compiled with an invalid major version",
5030 class_name->as_C_string(), major, minor);
5031 return;
5032 }
5033
5034 if (major > max_version) {
5035 Exceptions::fthrow(
5036 THREAD_AND_LOCATION,
5037 vmSymbols::java_lang_UnsupportedClassVersionError(),
5038 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5039 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5040 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5041 return;
5042 }
5043
5044 if (major < JAVA_12_VERSION || minor == 0) {
5045 return;
5046 }
5047
5048 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5049 if (major != max_version) {
5050 Exceptions::fthrow(
5051 THREAD_AND_LOCATION,
5052 vmSymbols::java_lang_UnsupportedClassVersionError(),
5053 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5054 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5055 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5056 return;
5057 }
5058
5059 if (!Arguments::enable_preview()) {
5060 Exceptions::fthrow(
5061 THREAD_AND_LOCATION,
5062 vmSymbols::java_lang_UnsupportedClassVersionError(),
5063 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5064 class_name->as_C_string(), major, minor);
5065 return;
5066 }
5067
5068 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5069 Exceptions::fthrow(
5070 THREAD_AND_LOCATION,
5071 vmSymbols::java_lang_UnsupportedClassVersionError(),
5072 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5073 class_name->as_C_string(), major, minor);
5074 }
5075 }
5076
5077 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5078 bool is_interface,
5079 bool is_value_type,
5080 TRAPS) const {
5081 if (!_need_verify) { return; }
5082
5083 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5084 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5085 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5086 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5087 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5088 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5089 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5090 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5091 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5092
5093 bool is_illegal = false;
5094
5095 if (is_interface) {
5096 if (!is_public || !is_static || !is_final || is_private ||
5097 is_protected || is_volatile || is_transient ||
5098 (major_gte_15 && is_enum)) {
5099 is_illegal = true;
5100 }
5101 } else { // not interface
5102 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5103 is_illegal = true;
5104 } else {
5105 if (is_value_type && !is_static && !is_final) {
5106 is_illegal = true;
5107 }
5108 }
5109 }
5110
5111 if (is_illegal) {
5112 ResourceMark rm(THREAD);
5113 Exceptions::fthrow(
5114 THREAD_AND_LOCATION,
5115 vmSymbols::java_lang_ClassFormatError(),
5116 "Illegal field modifiers in class %s: 0x%X",
5117 _class_name->as_C_string(), flags);
5118 return;
5119 }
5120 }
5121
5122 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5123 bool is_interface,
5124 bool is_value_type,
5125 const Symbol* name,
5126 TRAPS) const {
5127 if (!_need_verify) { return; }
5128
5129 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5130 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5131 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5132 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5133 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5134 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5135 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5136 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5137 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5138 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5139 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5140 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5141 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5142
5143 bool is_illegal = false;
5144
5145 const char* class_note = "";
5146
5147 if (is_interface) {
5148 if (major_gte_8) {
5149 // Class file version is JAVA_8_VERSION or later Methods of
5150 // interfaces may set any of the flags except ACC_PROTECTED,
5151 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5152 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5153 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5154 (is_native || is_protected || is_final || is_synchronized) ||
5155 // If a specific method of a class or interface has its
5156 // ACC_ABSTRACT flag set, it must not have any of its
5157 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5158 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5159 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5160 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5161 (is_abstract && (is_private || is_static || is_strict))) {
5162 is_illegal = true;
5163 }
5164 } else if (major_gte_15) {
5165 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5166 if (!is_public || is_private || is_protected || is_static || is_final ||
5167 is_synchronized || is_native || !is_abstract || is_strict) {
5168 is_illegal = true;
5169 }
5170 } else {
5171 // Class file version is pre-JAVA_1_5_VERSION
5172 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5173 is_illegal = true;
5174 }
5175 }
5176 } else { // not interface
5177 if (has_illegal_visibility(flags)) {
5178 is_illegal = true;
5179 } else {
5180 if (is_initializer) {
5181 if (is_final || is_synchronized || is_native ||
5182 is_abstract || (major_gte_15 && is_bridge)) {
5183 is_illegal = true;
5184 }
5185 if (!is_static && !is_value_type) {
5186 // OK, an object constructor in a regular class
5187 } else if (is_static && is_value_type) {
5188 // OK, a static init factory in an inline class
5189 } else {
5190 // but no other combinations are allowed
5191 is_illegal = true;
5192 class_note = (is_value_type ? " (an inline class)" : " (not an inline class)");
5193 }
5194 } else { // not initializer
5195 if (is_value_type && is_synchronized && !is_static) {
5196 is_illegal = true;
5197 class_note = " (an inline class)";
5198 } else {
5199 if (is_abstract) {
5200 if ((is_final || is_native || is_private || is_static ||
5201 (major_gte_15 && (is_synchronized || is_strict)))) {
5202 is_illegal = true;
5203 }
5204 }
5205 }
5206 }
5207 }
5208 }
5209
5210 if (is_illegal) {
5211 ResourceMark rm(THREAD);
5212 Exceptions::fthrow(
5213 THREAD_AND_LOCATION,
5214 vmSymbols::java_lang_ClassFormatError(),
5215 "Method %s in class %s%s has illegal modifiers: 0x%X",
5216 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
5217 return;
5218 }
5219 }
5220
5221 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5222 int length,
5223 TRAPS) const {
5224 assert(_need_verify, "only called when _need_verify is true");
5225 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5226 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5227 }
5228 }
5229
5230 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5231 // In class names, '/' separates unqualified names. This is verified in this function also.
5232 // Method names also may not contain the characters '<' or '>', unless <init>
5233 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5234 // method. Because these names have been checked as special cases before
5235 // calling this method in verify_legal_method_name.
5236 //
5237 // This method is also called from the modular system APIs in modules.cpp
5238 // to verify the validity of module and package names.
5239 bool ClassFileParser::verify_unqualified_name(const char* name,
5240 unsigned int length,
5241 int type) {
5242 if (length == 0) return false; // Must have at least one char.
5243 for (const char* p = name; p != name + length; p++) {
5244 switch(*p) {
5245 case '.':
5246 case ';':
5247 case '[':
5248 // do not permit '.', ';', or '['
5249 return false;
5250 case '/':
5251 // check for '//' or leading or trailing '/' which are not legal
5252 // unqualified name must not be empty
5253 if (type == ClassFileParser::LegalClass) {
5254 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5255 return false;
5256 }
5257 } else {
5258 return false; // do not permit '/' unless it's class name
5259 }
5260 break;
5261 case '<':
5262 case '>':
5263 // do not permit '<' or '>' in method names
5264 if (type == ClassFileParser::LegalMethod) {
5265 return false;
5266 }
5267 }
5268 }
5269 return true;
5270 }
5271
5272 // Take pointer to a UTF8 byte string (not NUL-terminated).
5273 // Skip over the longest part of the string that could
5274 // be taken as a fieldname. Allow '/' if slash_ok is true.
5275 // Return a pointer to just past the fieldname.
5276 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5277 // being true, we saw consecutive slashes (meaning we were looking for a
5278 // qualified path but found something that was badly-formed).
5279 static const char* skip_over_field_name(const char* const name,
5280 bool slash_ok,
5281 unsigned int length) {
5282 const char* p;
5283 jboolean last_is_slash = false;
5284 jboolean not_first_ch = false;
5285
5286 for (p = name; p != name + length; not_first_ch = true) {
5287 const char* old_p = p;
5288 jchar ch = *p;
5289 if (ch < 128) {
5290 p++;
5291 // quick check for ascii
5292 if ((ch >= 'a' && ch <= 'z') ||
5293 (ch >= 'A' && ch <= 'Z') ||
5294 (ch == '_' || ch == '$') ||
5295 (not_first_ch && ch >= '0' && ch <= '9')) {
5296 last_is_slash = false;
5297 continue;
5298 }
5299 if (slash_ok && ch == '/') {
5300 if (last_is_slash) {
5301 return NULL; // Don't permit consecutive slashes
5302 }
5303 last_is_slash = true;
5304 continue;
5305 }
5306 }
5307 else {
5308 jint unicode_ch;
5309 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5310 p = tmp_p;
5311 last_is_slash = false;
5312 // Check if ch is Java identifier start or is Java identifier part
5313 // 4672820: call java.lang.Character methods directly without generating separate tables.
5314 EXCEPTION_MARK;
5315 // return value
5316 JavaValue result(T_BOOLEAN);
5317 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5318 JavaCallArguments args;
5319 args.push_int(unicode_ch);
5320
5321 if (not_first_ch) {
5322 // public static boolean isJavaIdentifierPart(char ch);
5323 JavaCalls::call_static(&result,
5324 SystemDictionary::Character_klass(),
5325 vmSymbols::isJavaIdentifierPart_name(),
5326 vmSymbols::int_bool_signature(),
5327 &args,
5328 THREAD);
5329 } else {
5330 // public static boolean isJavaIdentifierStart(char ch);
5331 JavaCalls::call_static(&result,
5332 SystemDictionary::Character_klass(),
5333 vmSymbols::isJavaIdentifierStart_name(),
5334 vmSymbols::int_bool_signature(),
5335 &args,
5336 THREAD);
5337 }
5338 if (HAS_PENDING_EXCEPTION) {
5339 CLEAR_PENDING_EXCEPTION;
5340 return NULL;
5341 }
5342 if(result.get_jboolean()) {
5343 continue;
5344 }
5345 }
5346 return (not_first_ch) ? old_p : NULL;
5347 }
5348 return (not_first_ch) ? p : NULL;
5349 }
5350
5351 // Take pointer to a UTF8 byte string (not NUL-terminated).
5352 // Skip over the longest part of the string that could
5353 // be taken as a field signature. Allow "void" if void_ok.
5354 // Return a pointer to just past the signature.
5355 // Return NULL if no legal signature is found.
5356 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5357 bool void_ok,
5358 unsigned int length,
5359 TRAPS) const {
5360 unsigned int array_dim = 0;
5361 while (length > 0) {
5362 switch (signature[0]) {
5363 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5364 case JVM_SIGNATURE_BOOLEAN:
5365 case JVM_SIGNATURE_BYTE:
5366 case JVM_SIGNATURE_CHAR:
5367 case JVM_SIGNATURE_SHORT:
5368 case JVM_SIGNATURE_INT:
5369 case JVM_SIGNATURE_FLOAT:
5370 case JVM_SIGNATURE_LONG:
5371 case JVM_SIGNATURE_DOUBLE:
5372 return signature + 1;
5373 case JVM_SIGNATURE_VALUETYPE:
5374 // Can't enable this check until JDK upgrades the bytecode generators
5375 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5376 // classfile_parse_error("Class name contains illegal Q-signature "
5377 // "in descriptor in class file %s",
5378 // CHECK_0);
5379 // }
5380 // fall through
5381 case JVM_SIGNATURE_CLASS:
5382 {
5383 if (_major_version < JAVA_1_5_VERSION) {
5384 // Skip over the class name if one is there
5385 const char* const p = skip_over_field_name(signature + 1, true, --length);
5386
5387 // The next character better be a semicolon
5388 if (p && (p - signature) > 1 && p[0] == ';') {
5389 return p + 1;
5390 }
5391 }
5392 else {
5393 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5394 signature++;
5395 const char* c = (const char*) memchr(signature, ';', length - 1);
5396 // Format check signature
5397 if (c != NULL) {
5398 int newlen = c - (char*) signature;
5399 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5400 if (!legal) {
5401 classfile_parse_error("Class name is empty or contains illegal character "
5402 "in descriptor in class file %s",
5403 CHECK_0);
5404 return NULL;
5405 }
5406 return signature + newlen + 1;
5407 }
5408 }
5409 return NULL;
5410 }
5411 case JVM_SIGNATURE_ARRAY:
5412 array_dim++;
5413 if (array_dim > 255) {
5414 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5415 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5416 }
5417 // The rest of what's there better be a legal signature
5418 signature++;
5419 length--;
5420 void_ok = false;
5421 break;
5422 default:
5423 return NULL;
5424 }
5425 }
5426 return NULL;
5427 }
5428
5429 // Checks if name is a legal class name.
5430 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5431 if (!_need_verify || _relax_verify) { return; }
5432
5433 assert(name->refcount() > 0, "symbol must be kept alive");
5434 char* bytes = (char*)name->bytes();
5435 unsigned int length = name->utf8_length();
5436 bool legal = false;
5437
5438 if (length > 0) {
5439 const char* p;
5440 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5441 p = skip_over_field_signature(bytes, false, length, CHECK);
5442 legal = (p != NULL) && ((p - bytes) == (int)length);
5443 } else if (_major_version < JAVA_1_5_VERSION) {
5444 if (bytes[0] != '<') {
5445 p = skip_over_field_name(bytes, true, length);
5446 legal = (p != NULL) && ((p - bytes) == (int)length);
5447 }
5448 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5449 // Support for L...; and Q...; descriptors
5450 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5451 } else {
5452 // 4900761: relax the constraints based on JSR202 spec
5453 // Class names may be drawn from the entire Unicode character set.
5454 // Identifiers between '/' must be unqualified names.
5455 // The utf8 string has been verified when parsing cpool entries.
5456 legal = verify_unqualified_name(bytes, length, LegalClass);
5457 }
5458 }
5459 if (!legal) {
5460 ResourceMark rm(THREAD);
5461 assert(_class_name != NULL, "invariant");
5462 Exceptions::fthrow(
5463 THREAD_AND_LOCATION,
5464 vmSymbols::java_lang_ClassFormatError(),
5465 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5466 _class_name->as_C_string()
5467 );
5468 return;
5469 }
5470 }
5471
5472 // Checks if name is a legal field name.
5473 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5474 if (!_need_verify || _relax_verify) { return; }
5475
5476 char* bytes = (char*)name->bytes();
5477 unsigned int length = name->utf8_length();
5478 bool legal = false;
5479
5480 if (length > 0) {
5481 if (_major_version < JAVA_1_5_VERSION) {
5482 if (bytes[0] != '<') {
5483 const char* p = skip_over_field_name(bytes, false, length);
5484 legal = (p != NULL) && ((p - bytes) == (int)length);
5485 }
5486 } else {
5487 // 4881221: relax the constraints based on JSR202 spec
5488 legal = verify_unqualified_name(bytes, length, LegalField);
5489 }
5490 }
5491
5492 if (!legal) {
5493 ResourceMark rm(THREAD);
5494 assert(_class_name != NULL, "invariant");
5495 Exceptions::fthrow(
5496 THREAD_AND_LOCATION,
5497 vmSymbols::java_lang_ClassFormatError(),
5498 "Illegal field name \"%.*s\" in class %s", length, bytes,
5499 _class_name->as_C_string()
5500 );
5501 return;
5502 }
5503 }
5504
5505 // Checks if name is a legal method name.
5506 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5507 if (!_need_verify || _relax_verify) { return; }
5508
5509 assert(name != NULL, "method name is null");
5510 char* bytes = (char*)name->bytes();
5511 unsigned int length = name->utf8_length();
5512 bool legal = false;
5513
5514 if (length > 0) {
5515 if (bytes[0] == '<') {
5516 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5517 legal = true;
5518 }
5519 } else if (_major_version < JAVA_1_5_VERSION) {
5520 const char* p;
5521 p = skip_over_field_name(bytes, false, length);
5522 legal = (p != NULL) && ((p - bytes) == (int)length);
5523 } else {
5524 // 4881221: relax the constraints based on JSR202 spec
5525 legal = verify_unqualified_name(bytes, length, LegalMethod);
5526 }
5527 }
5528
5529 if (!legal) {
5530 ResourceMark rm(THREAD);
5531 assert(_class_name != NULL, "invariant");
5532 Exceptions::fthrow(
5533 THREAD_AND_LOCATION,
5534 vmSymbols::java_lang_ClassFormatError(),
5535 "Illegal method name \"%.*s\" in class %s", length, bytes,
5536 _class_name->as_C_string()
5537 );
5538 return;
5539 }
5540 }
5541
5542
5543 // Checks if signature is a legal field signature.
5544 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5545 const Symbol* signature,
5546 TRAPS) const {
5547 if (!_need_verify) { return; }
5548
5549 const char* const bytes = (const char* const)signature->bytes();
5550 const unsigned int length = signature->utf8_length();
5551 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5552
5553 if (p == NULL || (p - bytes) != (int)length) {
5554 throwIllegalSignature("Field", name, signature, CHECK);
5555 }
5556 }
5557
5558 // Checks if signature is a legal method signature.
5559 // Returns number of parameters
5560 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5561 const Symbol* signature,
5562 TRAPS) const {
5563 if (!_need_verify) {
5564 // make sure caller's args_size will be less than 0 even for non-static
5565 // method so it will be recomputed in compute_size_of_parameters().
5566 return -2;
5567 }
5568
5569 // Class initializers cannot have args for class format version >= 51.
5570 if (name == vmSymbols::class_initializer_name() &&
5571 signature != vmSymbols::void_method_signature() &&
5572 _major_version >= JAVA_7_VERSION) {
5573 throwIllegalSignature("Method", name, signature, CHECK_0);
5574 return 0;
5575 }
5576
5577 unsigned int args_size = 0;
5578 const char* p = (const char*)signature->bytes();
5579 unsigned int length = signature->utf8_length();
5580 const char* nextp;
5581
5582 // The first character must be a '('
5583 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5584 length--;
5585 // Skip over legal field signatures
5586 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5587 while ((length > 0) && (nextp != NULL)) {
5588 args_size++;
5589 if (p[0] == 'J' || p[0] == 'D') {
5590 args_size++;
5591 }
5592 length -= nextp - p;
5593 p = nextp;
5594 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5595 }
5596 // The first non-signature thing better be a ')'
5597 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5598 length--;
5599 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5600 // All constructor methods must return void
5601 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5602 return args_size;
5603 }
5604 // All static init methods must return the current class
5605 if ((length >= 3) && (p[length-1] == JVM_SIGNATURE_ENDCLASS)
5606 && name == vmSymbols::object_initializer_name()) {
5607 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5608 if (nextp && ((int)length == (nextp - p))) {
5609 // The actual class will be checked against current class
5610 // when the method is defined (see parse_method).
5611 // A reference to a static init with a bad return type
5612 // will load and verify OK, but will fail to link.
5613 return args_size;
5614 }
5615 }
5616 // The distinction between static factory methods and
5617 // constructors depends on the JVM_ACC_STATIC modifier.
5618 // This distinction must be reflected in a void or non-void
5619 // return. For declared methods, the check is in parse_method.
5620 } else {
5621 // Now we better just have a return value
5622 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5623 if (nextp && ((int)length == (nextp - p))) {
5624 return args_size;
5625 }
5626 }
5627 }
5628 }
5629 // Report error
5630 throwIllegalSignature("Method", name, signature, CHECK_0);
5631 return 0;
5632 }
5633
5634 int ClassFileParser::static_field_size() const {
5635 assert(_field_info != NULL, "invariant");
5636 return _field_info->static_field_size;
5637 }
5638
5639 int ClassFileParser::total_oop_map_count() const {
5640 assert(_field_info != NULL, "invariant");
5641 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5642 }
5643
5644 jint ClassFileParser::layout_size() const {
5645 assert(_field_info != NULL, "invariant");
5646 return _field_info->instance_size;
5647 }
5648
5649 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5650 const Array<Method*>* methods) {
5651 assert(ik != NULL, "invariant");
5652 assert(methods != NULL, "invariant");
5653
5654 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5655 // (We used to do this lazily, but now we query it in Rewriter,
5656 // which is eagerly done for every method, so we might as well do it now,
5657 // when everything is fresh in memory.)
5658 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5659
5660 if (klass_id != vmSymbols::NO_SID) {
5661 for (int j = 0; j < methods->length(); ++j) {
5662 Method* method = methods->at(j);
5663 method->init_intrinsic_id();
5664
5665 if (CheckIntrinsics) {
5666 // Check if an intrinsic is defined for method 'method',
5667 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5668 if (method->intrinsic_id() != vmIntrinsics::_none &&
5669 !method->intrinsic_candidate()) {
5670 tty->print("Compiler intrinsic is defined for method [%s], "
5671 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5672 method->name_and_sig_as_C_string(),
5673 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5674 );
5675 tty->cr();
5676 DEBUG_ONLY(vm_exit(1));
5677 }
5678 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5679 // but there is no intrinsic available for it.
5680 if (method->intrinsic_candidate() &&
5681 method->intrinsic_id() == vmIntrinsics::_none) {
5682 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5683 "but no compiler intrinsic is defined for the method.%s",
5684 method->name_and_sig_as_C_string(),
5685 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5686 );
5687 tty->cr();
5688 DEBUG_ONLY(vm_exit(1));
5689 }
5690 }
5691 } // end for
5692
5693 #ifdef ASSERT
5694 if (CheckIntrinsics) {
5695 // Check for orphan methods in the current class. A method m
5696 // of a class C is orphan if an intrinsic is defined for method m,
5697 // but class C does not declare m.
5698 // The check is potentially expensive, therefore it is available
5699 // only in debug builds.
5700
5701 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5702 if (vmIntrinsics::_compiledLambdaForm == id) {
5703 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5704 // generated for the JVM from a LambdaForm and therefore no method
5705 // is defined for it.
5706 continue;
5707 }
5708
5709 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5710 // Check if the current class contains a method with the same
5711 // name, flags, signature.
5712 bool match = false;
5713 for (int j = 0; j < methods->length(); ++j) {
5714 const Method* method = methods->at(j);
5715 if (method->intrinsic_id() == id) {
5716 match = true;
5717 break;
5718 }
5719 }
5720
5721 if (!match) {
5722 char buf[1000];
5723 tty->print("Compiler intrinsic is defined for method [%s], "
5724 "but the method is not available in class [%s].%s",
5725 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5726 buf, sizeof(buf)),
5727 ik->name()->as_C_string(),
5728 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5729 );
5730 tty->cr();
5731 DEBUG_ONLY(vm_exit(1));
5732 }
5733 }
5734 } // end for
5735 } // CheckIntrinsics
5736 #endif // ASSERT
5737 }
5738 }
5739
5740 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5741 if (_klass != NULL) {
5742 return _klass;
5743 }
5744
5745 InstanceKlass* const ik =
5746 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5747
5748 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5749
5750 assert(_klass == ik, "invariant");
5751
5752
5753 if (ik->should_store_fingerprint()) {
5754 ik->store_fingerprint(_stream->compute_fingerprint());
5755 }
5756
5757 ik->set_has_passed_fingerprint_check(false);
5758 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5759 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5760 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5761 if (aot_fp != 0 && aot_fp == fp) {
5762 // This class matches with a class saved in an AOT library
5763 ik->set_has_passed_fingerprint_check(true);
5764 } else {
5765 ResourceMark rm;
5766 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5767 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5768 }
5769 }
5770
5771 if (ik->is_value()) {
5772 ValueKlass* vk = ValueKlass::cast(ik);
5773 oop val = ik->allocate_instance(CHECK_NULL);
5774 vk->set_default_value(val);
5775 }
5776
5777 return ik;
5778 }
5779
5780 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5781 assert(ik != NULL, "invariant");
5782
5783 // Set name and CLD before adding to CLD
5784 ik->set_class_loader_data(_loader_data);
5785 ik->set_name(_class_name);
5786
5787 // Add all classes to our internal class loader list here,
5788 // including classes in the bootstrap (NULL) class loader.
5789 const bool publicize = !is_internal();
5790
5791 _loader_data->add_class(ik, publicize);
5792
5793 set_klass_to_deallocate(ik);
5794
5795 assert(_field_info != NULL, "invariant");
5796 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5797 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5798 "sanity");
5799
5800 assert(ik->is_instance_klass(), "sanity");
5801 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5802
5803 // Fill in information already parsed
5804 ik->set_should_verify_class(_need_verify);
5805
5806 // Not yet: supers are done below to support the new subtype-checking fields
5807 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5808 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5809 assert(_fac != NULL, "invariant");
5810 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5811
5812 // this transfers ownership of a lot of arrays from
5813 // the parser onto the InstanceKlass*
5814 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5815
5816 // note that is not safe to use the fields in the parser from this point on
5817 assert(NULL == _cp, "invariant");
5818 assert(NULL == _fields, "invariant");
5819 assert(NULL == _methods, "invariant");
5820 assert(NULL == _inner_classes, "invariant");
5821 assert(NULL == _nest_members, "invariant");
5822 assert(NULL == _local_interfaces, "invariant");
5823 assert(NULL == _combined_annotations, "invariant");
5824
5825 if (_has_final_method) {
5826 ik->set_has_final_method();
5827 }
5828
5829 ik->copy_method_ordering(_method_ordering, CHECK);
5830 // The InstanceKlass::_methods_jmethod_ids cache
5831 // is managed on the assumption that the initial cache
5832 // size is equal to the number of methods in the class. If
5833 // that changes, then InstanceKlass::idnum_can_increment()
5834 // has to be changed accordingly.
5835 ik->set_initial_method_idnum(ik->methods()->length());
5836
5837 ik->set_this_class_index(_this_class_index);
5838
5839 if (is_unsafe_anonymous()) {
5840 // _this_class_index is a CONSTANT_Class entry that refers to this
5841 // anonymous class itself. If this class needs to refer to its own methods or
5842 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5843 // _this_class_index. However, because this class is anonymous (it's
5844 // not stored in SystemDictionary), _this_class_index cannot be resolved
5845 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5846 // Therefore, we must eagerly resolve _this_class_index now.
5847 ik->constants()->klass_at_put(_this_class_index, ik);
5848 }
5849
5850 ik->set_minor_version(_minor_version);
5851 ik->set_major_version(_major_version);
5852 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5853 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5854
5855 if (_unsafe_anonymous_host != NULL) {
5856 assert (ik->is_unsafe_anonymous(), "should be the same");
5857 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5858 }
5859
5860 // Set PackageEntry for this_klass
5861 oop cl = ik->class_loader();
5862 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5863 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5864 ik->set_package(cld, CHECK);
5865
5866 const Array<Method*>* const methods = ik->methods();
5867 assert(methods != NULL, "invariant");
5868 const int methods_len = methods->length();
5869
5870 check_methods_for_intrinsics(ik, methods);
5871
5872 // Fill in field values obtained by parse_classfile_attributes
5873 if (_parsed_annotations->has_any_annotations()) {
5874 _parsed_annotations->apply_to(ik);
5875 }
5876
5877 apply_parsed_class_attributes(ik);
5878
5879 // Miranda methods
5880 if ((_num_miranda_methods > 0) ||
5881 // if this class introduced new miranda methods or
5882 (_super_klass != NULL && _super_klass->has_miranda_methods())
5883 // super class exists and this class inherited miranda methods
5884 ) {
5885 ik->set_has_miranda_methods(); // then set a flag
5886 }
5887
5888 // Fill in information needed to compute superclasses.
5889 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5890 ik->set_transitive_interfaces(_transitive_interfaces);
5891 _transitive_interfaces = NULL;
5892
5893 // Initialize itable offset tables
5894 klassItable::setup_itable_offset_table(ik);
5895
5896 // Compute transitive closure of interfaces this class implements
5897 // Do final class setup
5898 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5899 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5900 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5901 }
5902
5903 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5904 set_precomputed_flags(ik, CHECK);
5905
5906 // check if this class can access its super class
5907 check_super_class_access(ik, CHECK);
5908
5909 // check if this class can access its superinterfaces
5910 check_super_interface_access(ik, CHECK);
5911
5912 // check if this class overrides any final method
5913 check_final_method_override(ik, CHECK);
5914
5915 // reject static interface methods prior to Java 8
5916 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5917 check_illegal_static_method(ik, CHECK);
5918 }
5919
5920 // Obtain this_klass' module entry
5921 ModuleEntry* module_entry = ik->module();
5922 assert(module_entry != NULL, "module_entry should always be set");
5923
5924 // Obtain java.lang.Module
5925 Handle module_handle(THREAD, module_entry->module());
5926
5927 // Allocate mirror and initialize static fields
5928 // The create_mirror() call will also call compute_modifiers()
5929 java_lang_Class::create_mirror(ik,
5930 Handle(THREAD, _loader_data->class_loader()),
5931 module_handle,
5932 _protection_domain,
5933 CHECK);
5934
5935 assert(_all_mirandas != NULL, "invariant");
5936
5937 // Generate any default methods - default methods are public interface methods
5938 // that have a default implementation. This is new with Java 8.
5939 if (_has_nonstatic_concrete_methods) {
5940 DefaultMethods::generate_default_methods(ik,
5941 _all_mirandas,
5942 CHECK);
5943 }
5944
5945 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5946 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5947 !module_entry->has_default_read_edges()) {
5948 if (!module_entry->set_has_default_read_edges()) {
5949 // We won a potential race
5950 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5951 }
5952 }
5953
5954 int nfields = ik->java_fields_count();
5955 if (ik->is_value()) nfields++;
5956 for (int i = 0; i < nfields; i++) {
5957 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
5958 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
5959 // Value classes must have been pre-loaded
5960 Klass* klass = SystemDictionary::find(klass_name,
5961 Handle(THREAD, ik->class_loader()),
5962 Handle(THREAD, ik->protection_domain()), CHECK);
5963 assert(klass != NULL, "Sanity check");
5964 assert(klass->access_flags().is_value_type(), "Value type expected");
5965 ik->set_value_field_klass(i, klass);
5966 klass_name->decrement_refcount();
5967 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5968 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5969 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5970 }
5971 }
5972
5973 if (is_value_type()) {
5974 ValueKlass::cast(ik)->set_alignment(_alignment);
5975 ValueKlass::cast(ik)->set_first_field_offset(_first_field_offset);
5976 ValueKlass::cast(ik)->set_exact_size_in_bytes(_exact_size_in_bytes);
5977 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
5978 }
5979
5980 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5981
5982 if (!is_internal()) {
5983 if (log_is_enabled(Info, class, load)) {
5984 ResourceMark rm;
5985 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5986 ik->print_class_load_logging(_loader_data, module_name, _stream);
5987 }
5988
5989 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5990 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5991 log_is_enabled(Info, class, preview)) {
5992 ResourceMark rm;
5993 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5994 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5995 }
5996
5997 if (log_is_enabled(Debug, class, resolve)) {
5998 ResourceMark rm;
5999 // print out the superclass.
6000 const char * from = ik->external_name();
6001 if (ik->java_super() != NULL) {
6002 log_debug(class, resolve)("%s %s (super)",
6003 from,
6004 ik->java_super()->external_name());
6005 }
6006 // print out each of the interface classes referred to by this class.
6007 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6008 if (local_interfaces != NULL) {
6009 const int length = local_interfaces->length();
6010 for (int i = 0; i < length; i++) {
6011 const InstanceKlass* const k = local_interfaces->at(i);
6012 const char * to = k->external_name();
6013 log_debug(class, resolve)("%s %s (interface)", from, to);
6014 }
6015 }
6016 }
6017 }
6018
6019 JFR_ONLY(INIT_ID(ik);)
6020
6021 // If we reach here, all is well.
6022 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6023 // in order for it to not be destroyed in the ClassFileParser destructor.
6024 set_klass_to_deallocate(NULL);
6025
6026 // it's official
6027 set_klass(ik);
6028
6029 debug_only(ik->verify();)
6030 }
6031
6032 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6033 // Decrement the refcount in the old name, since we're clobbering it.
6034 _class_name->decrement_refcount();
6035
6036 _class_name = new_class_name;
6037 // Increment the refcount of the new name.
6038 // Now the ClassFileParser owns this name and will decrement in
6039 // the destructor.
6040 _class_name->increment_refcount();
6041 }
6042
6043
6044 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6045 // package by prepending its host class's package name to its class name and setting
6046 // its _class_name field.
6047 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6048 ResourceMark rm(THREAD);
6049 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6050 "Unsafe anonymous class should not be in a package");
6051 const char* host_pkg_name =
6052 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6053
6054 if (host_pkg_name != NULL) {
6055 int host_pkg_len = (int)strlen(host_pkg_name);
6056 int class_name_len = _class_name->utf8_length();
6057 int symbol_len = host_pkg_len + 1 + class_name_len;
6058 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6059 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
6060 host_pkg_name, class_name_len, _class_name->base());
6061 assert(n == symbol_len, "Unexpected number of characters in string");
6062
6063 // Decrement old _class_name to avoid leaking.
6064 _class_name->decrement_refcount();
6065
6066 // Create a symbol and update the anonymous class name.
6067 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6068 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6069 // when the class is unloaded.
6070 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
6071 }
6072 }
6073
6074 // If the host class and the anonymous class are in the same package then do
6075 // nothing. If the anonymous class is in the unnamed package then move it to its
6076 // host's package. If the classes are in different packages then throw an IAE
6077 // exception.
6078 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6079 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6080
6081 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6082 _class_name->utf8_length(), '/');
6083 if (anon_last_slash == NULL) { // Unnamed package
6084 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6085 } else {
6086 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6087 ResourceMark rm(THREAD);
6088 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6089 err_msg("Host class %s and anonymous class %s are in different packages",
6090 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6091 }
6092 }
6093 }
6094
6095 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6096 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6097 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6098 bool need_verify =
6099 // verifyAll
6100 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6101 // verifyRemote
6102 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6103 return !need_verify;
6104 }
6105
6106 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6107 Symbol* name,
6108 ClassLoaderData* loader_data,
6109 Handle protection_domain,
6110 const InstanceKlass* unsafe_anonymous_host,
6111 GrowableArray<Handle>* cp_patches,
6112 Publicity pub_level,
6113 TRAPS) :
6114 _stream(stream),
6115 _requested_name(name),
6116 _class_name(NULL),
6117 _loader_data(loader_data),
6118 _unsafe_anonymous_host(unsafe_anonymous_host),
6119 _cp_patches(cp_patches),
6120 _num_patched_klasses(0),
6121 _max_num_patched_klasses(0),
6122 _orig_cp_size(0),
6123 _first_patched_klass_resolved_index(0),
6124 _super_klass(),
6125 _cp(NULL),
6126 _fields(NULL),
6127 _methods(NULL),
6128 _inner_classes(NULL),
6129 _nest_members(NULL),
6130 _nest_host(0),
6131 _local_interfaces(NULL),
6132 _transitive_interfaces(NULL),
6133 _combined_annotations(NULL),
6134 _annotations(NULL),
6135 _type_annotations(NULL),
6136 _fields_annotations(NULL),
6137 _fields_type_annotations(NULL),
6138 _klass(NULL),
6139 _klass_to_deallocate(NULL),
6140 _parsed_annotations(NULL),
6141 _fac(NULL),
6142 _field_info(NULL),
6143 _method_ordering(NULL),
6144 _all_mirandas(NULL),
6145 _vtable_size(0),
6146 _itable_size(0),
6147 _num_miranda_methods(0),
6148 _rt(REF_NONE),
6149 _protection_domain(protection_domain),
6150 _access_flags(),
6151 _pub_level(pub_level),
6152 _bad_constant_seen(0),
6153 _synthetic_flag(false),
6154 _sde_length(false),
6155 _sde_buffer(NULL),
6156 _sourcefile_index(0),
6157 _generic_signature_index(0),
6158 _major_version(0),
6159 _minor_version(0),
6160 _this_class_index(0),
6161 _super_class_index(0),
6162 _itfs_len(0),
6163 _java_fields_count(0),
6164 _need_verify(false),
6165 _relax_verify(false),
6166 _has_nonstatic_concrete_methods(false),
6167 _declares_nonstatic_concrete_methods(false),
6168 _has_final_method(false),
6169 _has_flattenable_fields(false),
6170 _has_finalizer(false),
6171 _has_empty_finalizer(false),
6172 _has_vanilla_constructor(false),
6173 _max_bootstrap_specifier_index(-1) {
6174
6175 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6176 _class_name->increment_refcount();
6177
6178 assert(THREAD->is_Java_thread(), "invariant");
6179 assert(_loader_data != NULL, "invariant");
6180 assert(stream != NULL, "invariant");
6181 assert(_stream != NULL, "invariant");
6182 assert(_stream->buffer() == _stream->current(), "invariant");
6183 assert(_class_name != NULL, "invariant");
6184 assert(0 == _access_flags.as_int(), "invariant");
6185
6186 // Figure out whether we can skip format checking (matching classic VM behavior)
6187 if (DumpSharedSpaces) {
6188 // verify == true means it's a 'remote' class (i.e., non-boot class)
6189 // Verification decision is based on BytecodeVerificationRemote flag
6190 // for those classes.
6191 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6192 BytecodeVerificationLocal;
6193 }
6194 else {
6195 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6196 stream->need_verify());
6197 }
6198 if (_cp_patches != NULL) {
6199 int len = _cp_patches->length();
6200 for (int i=0; i<len; i++) {
6201 if (has_cp_patch_at(i)) {
6202 Handle patch = cp_patch_at(i);
6203 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6204 // We need to append the names of the patched classes to the end of the constant pool,
6205 // because a patched class may have a Utf8 name that's not already included in the
6206 // original constant pool. These class names are used when patch_constant_pool()
6207 // calls patch_class().
6208 //
6209 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6210 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6211 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6212 _max_num_patched_klasses++;
6213 }
6214 }
6215 }
6216 }
6217
6218 // synch back verification state to stream
6219 stream->set_verify(_need_verify);
6220
6221 // Check if verification needs to be relaxed for this class file
6222 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6223 _relax_verify = relax_format_check_for(_loader_data);
6224
6225 parse_stream(stream, CHECK);
6226
6227 post_process_parsed_stream(stream, _cp, CHECK);
6228 }
6229
6230 void ClassFileParser::clear_class_metadata() {
6231 // metadata created before the instance klass is created. Must be
6232 // deallocated if classfile parsing returns an error.
6233 _cp = NULL;
6234 _fields = NULL;
6235 _methods = NULL;
6236 _inner_classes = NULL;
6237 _nest_members = NULL;
6238 _local_interfaces = NULL;
6239 _combined_annotations = NULL;
6240 _annotations = _type_annotations = NULL;
6241 _fields_annotations = _fields_type_annotations = NULL;
6242 }
6243
6244 // Destructor to clean up
6245 ClassFileParser::~ClassFileParser() {
6246 _class_name->decrement_refcount();
6247
6248 if (_cp != NULL) {
6249 MetadataFactory::free_metadata(_loader_data, _cp);
6250 }
6251 if (_fields != NULL) {
6252 MetadataFactory::free_array<u2>(_loader_data, _fields);
6253 }
6254
6255 if (_methods != NULL) {
6256 // Free methods
6257 InstanceKlass::deallocate_methods(_loader_data, _methods);
6258 }
6259
6260 // beware of the Universe::empty_blah_array!!
6261 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6262 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6263 }
6264
6265 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6266 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6267 }
6268
6269 // Free interfaces
6270 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6271 _local_interfaces, _transitive_interfaces);
6272
6273 if (_combined_annotations != NULL) {
6274 // After all annotations arrays have been created, they are installed into the
6275 // Annotations object that will be assigned to the InstanceKlass being created.
6276
6277 // Deallocate the Annotations object and the installed annotations arrays.
6278 _combined_annotations->deallocate_contents(_loader_data);
6279
6280 // If the _combined_annotations pointer is non-NULL,
6281 // then the other annotations fields should have been cleared.
6282 assert(_annotations == NULL, "Should have been cleared");
6283 assert(_type_annotations == NULL, "Should have been cleared");
6284 assert(_fields_annotations == NULL, "Should have been cleared");
6285 assert(_fields_type_annotations == NULL, "Should have been cleared");
6286 } else {
6287 // If the annotations arrays were not installed into the Annotations object,
6288 // then they have to be deallocated explicitly.
6289 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6290 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6291 Annotations::free_contents(_loader_data, _fields_annotations);
6292 Annotations::free_contents(_loader_data, _fields_type_annotations);
6293 }
6294
6295 clear_class_metadata();
6296 _transitive_interfaces = NULL;
6297
6298 // deallocate the klass if already created. Don't directly deallocate, but add
6299 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6300 // at a safepoint.
6301 if (_klass_to_deallocate != NULL) {
6302 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6303 }
6304 }
6305
6306 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6307 TRAPS) {
6308
6309 assert(stream != NULL, "invariant");
6310 assert(_class_name != NULL, "invariant");
6311
6312 // BEGIN STREAM PARSING
6313 stream->guarantee_more(8, CHECK); // magic, major, minor
6314 // Magic value
6315 const u4 magic = stream->get_u4_fast();
6316 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6317 "Incompatible magic value %u in class file %s",
6318 magic, CHECK);
6319
6320 // Version numbers
6321 _minor_version = stream->get_u2_fast();
6322 _major_version = stream->get_u2_fast();
6323
6324 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6325 ResourceMark rm;
6326 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6327 _major_version, _minor_version, _class_name->as_C_string());
6328 Exceptions::fthrow(
6329 THREAD_AND_LOCATION,
6330 vmSymbols::java_lang_UnsupportedClassVersionError(),
6331 "Unsupported major.minor version for dump time %u.%u",
6332 _major_version,
6333 _minor_version);
6334 }
6335
6336 // Check version numbers - we check this even with verifier off
6337 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6338
6339 stream->guarantee_more(3, CHECK); // length, first cp tag
6340 u2 cp_size = stream->get_u2_fast();
6341
6342 guarantee_property(
6343 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6344 cp_size, CHECK);
6345
6346 _orig_cp_size = cp_size;
6347 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6348 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6349 }
6350 cp_size += _max_num_patched_klasses;
6351
6352 _cp = ConstantPool::allocate(_loader_data,
6353 cp_size,
6354 CHECK);
6355
6356 ConstantPool* const cp = _cp;
6357
6358 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6359
6360 assert(cp_size == (const u2)cp->length(), "invariant");
6361
6362 // ACCESS FLAGS
6363 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6364
6365 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6366 // JVM_ACC_MODULE is defined in JDK-9 and later.
6367 if (_major_version >= JAVA_9_VERSION) {
6368 recognized_modifiers |= JVM_ACC_MODULE;
6369 }
6370 // JVM_ACC_VALUE is defined for class file version 55 and later
6371 if (supports_value_types()) {
6372 recognized_modifiers |= JVM_ACC_VALUE;
6373 }
6374
6375 // Access flags
6376 jint flags = stream->get_u2_fast() & recognized_modifiers;
6377
6378 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6379 // Set abstract bit for old class files for backward compatibility
6380 flags |= JVM_ACC_ABSTRACT;
6381 }
6382
6383 verify_legal_class_modifiers(flags, CHECK);
6384
6385 short bad_constant = class_bad_constant_seen();
6386 if (bad_constant != 0) {
6387 // Do not throw CFE until after the access_flags are checked because if
6388 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6389 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6390 }
6391
6392 _access_flags.set_flags(flags);
6393
6394 // This class and superclass
6395 _this_class_index = stream->get_u2_fast();
6396 check_property(
6397 valid_cp_range(_this_class_index, cp_size) &&
6398 cp->tag_at(_this_class_index).is_unresolved_klass(),
6399 "Invalid this class index %u in constant pool in class file %s",
6400 _this_class_index, CHECK);
6401
6402 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6403 assert(class_name_in_cp != NULL, "class_name can't be null");
6404
6405 // Update _class_name to reflect the name in the constant pool
6406 update_class_name(class_name_in_cp);
6407
6408 // Don't need to check whether this class name is legal or not.
6409 // It has been checked when constant pool is parsed.
6410 // However, make sure it is not an array type.
6411 if (_need_verify) {
6412 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6413 "Bad class name in class file %s",
6414 CHECK);
6415 }
6416
6417 // Checks if name in class file matches requested name
6418 if (_requested_name != NULL && _requested_name != _class_name) {
6419 ResourceMark rm(THREAD);
6420 Exceptions::fthrow(
6421 THREAD_AND_LOCATION,
6422 vmSymbols::java_lang_NoClassDefFoundError(),
6423 "%s (wrong name: %s)",
6424 _class_name->as_C_string(),
6425 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6426 );
6427 return;
6428 }
6429
6430 // if this is an anonymous class fix up its name if it's in the unnamed
6431 // package. Otherwise, throw IAE if it is in a different package than
6432 // its host class.
6433 if (_unsafe_anonymous_host != NULL) {
6434 fix_unsafe_anonymous_class_name(CHECK);
6435 }
6436
6437 // Verification prevents us from creating names with dots in them, this
6438 // asserts that that's the case.
6439 assert(is_internal_format(_class_name), "external class name format used internally");
6440
6441 if (!is_internal()) {
6442 LogTarget(Debug, class, preorder) lt;
6443 if (lt.is_enabled()){
6444 ResourceMark rm(THREAD);
6445 LogStream ls(lt);
6446 ls.print("%s", _class_name->as_klass_external_name());
6447 if (stream->source() != NULL) {
6448 ls.print(" source: %s", stream->source());
6449 }
6450 ls.cr();
6451 }
6452
6453 #if INCLUDE_CDS
6454 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6455 if (!ClassLoader::has_jrt_entry()) {
6456 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6457 DumpLoadedClassList = NULL;
6458 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6459 _unsafe_anonymous_host == NULL) {
6460 // Only dump the classes that can be stored into CDS archive.
6461 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6462 oop class_loader = _loader_data->class_loader();
6463 ResourceMark rm(THREAD);
6464 bool skip = false;
6465 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6466 // For the boot and platform class loaders, skip classes that are not found in the
6467 // java runtime image, such as those found in the --patch-module entries.
6468 // These classes can't be loaded from the archive during runtime.
6469 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6470 skip = true;
6471 }
6472
6473 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6474 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6475 // as they can be loaded from the archive during runtime.
6476 skip = false;
6477 }
6478 }
6479 if (skip) {
6480 tty->print_cr("skip writing class %s from source %s to classlist file",
6481 _class_name->as_C_string(), stream->source());
6482 } else {
6483 classlist_file->print_cr("%s", _class_name->as_C_string());
6484 classlist_file->flush();
6485 }
6486 }
6487 }
6488 #endif
6489 }
6490
6491 // SUPERKLASS
6492 _super_class_index = stream->get_u2_fast();
6493 _super_klass = parse_super_class(cp,
6494 _super_class_index,
6495 _need_verify,
6496 CHECK);
6497
6498 // Interfaces
6499 _itfs_len = stream->get_u2_fast();
6500 parse_interfaces(stream,
6501 _itfs_len,
6502 cp,
6503 &_has_nonstatic_concrete_methods,
6504 CHECK);
6505
6506 assert(_local_interfaces != NULL, "invariant");
6507
6508 // Fields (offsets are filled in later)
6509 _fac = new FieldAllocationCount();
6510 parse_fields(stream,
6511 _access_flags.is_interface(),
6512 _access_flags.is_value_type(),
6513 _fac,
6514 cp,
6515 cp_size,
6516 &_java_fields_count,
6517 CHECK);
6518
6519 assert(_fields != NULL, "invariant");
6520
6521 // Methods
6522 AccessFlags promoted_flags;
6523 parse_methods(stream,
6524 _access_flags.is_interface(),
6525 _access_flags.is_value_type(),
6526 &promoted_flags,
6527 &_has_final_method,
6528 &_declares_nonstatic_concrete_methods,
6529 CHECK);
6530
6531 assert(_methods != NULL, "invariant");
6532
6533 // promote flags from parse_methods() to the klass' flags
6534 _access_flags.add_promoted_flags(promoted_flags.as_int());
6535
6536 if (_declares_nonstatic_concrete_methods) {
6537 _has_nonstatic_concrete_methods = true;
6538 }
6539
6540 // Additional attributes/annotations
6541 _parsed_annotations = new ClassAnnotationCollector();
6542 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6543
6544 assert(_inner_classes != NULL, "invariant");
6545
6546 // Finalize the Annotations metadata object,
6547 // now that all annotation arrays have been created.
6548 create_combined_annotations(CHECK);
6549
6550 // Make sure this is the end of class file stream
6551 guarantee_property(stream->at_eos(),
6552 "Extra bytes at the end of class file %s",
6553 CHECK);
6554
6555 // all bytes in stream read and parsed
6556 }
6557
6558 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6559 ConstantPool* cp,
6560 TRAPS) {
6561 assert(stream != NULL, "invariant");
6562 assert(stream->at_eos(), "invariant");
6563 assert(cp != NULL, "invariant");
6564 assert(_loader_data != NULL, "invariant");
6565
6566 if (_class_name == vmSymbols::java_lang_Object()) {
6567 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6568 "java.lang.Object cannot implement an interface in class file %s",
6569 CHECK);
6570 }
6571 // We check super class after class file is parsed and format is checked
6572 if (_super_class_index > 0 && NULL ==_super_klass) {
6573 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6574 if (_access_flags.is_interface()) {
6575 // Before attempting to resolve the superclass, check for class format
6576 // errors not checked yet.
6577 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6578 "Interfaces must have java.lang.Object as superclass in class file %s",
6579 CHECK);
6580 }
6581 Handle loader(THREAD, _loader_data->class_loader());
6582 _super_klass = (const InstanceKlass*)
6583 SystemDictionary::resolve_super_or_fail(_class_name,
6584 super_class_name,
6585 loader,
6586 _protection_domain,
6587 true,
6588 CHECK);
6589 }
6590
6591 if (_super_klass != NULL) {
6592 if (_super_klass->has_nonstatic_concrete_methods()) {
6593 _has_nonstatic_concrete_methods = true;
6594 }
6595
6596 if (_super_klass->is_interface()) {
6597 ResourceMark rm(THREAD);
6598 Exceptions::fthrow(
6599 THREAD_AND_LOCATION,
6600 vmSymbols::java_lang_IncompatibleClassChangeError(),
6601 "class %s has interface %s as super class",
6602 _class_name->as_klass_external_name(),
6603 _super_klass->external_name()
6604 );
6605 return;
6606 }
6607
6608 // For a value class, only java/lang/Object is an acceptable super class
6609 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6610 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6611 "Value type must have java.lang.Object as superclass in class file %s",
6612 CHECK);
6613 }
6614
6615 // Make sure super class is not final
6616 if (_super_klass->is_final()) {
6617 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6618 }
6619 }
6620
6621 // Compute the transitive list of all unique interfaces implemented by this class
6622 _transitive_interfaces =
6623 compute_transitive_interfaces(_super_klass,
6624 _local_interfaces,
6625 _loader_data,
6626 CHECK);
6627
6628 assert(_transitive_interfaces != NULL, "invariant");
6629
6630 // sort methods
6631 _method_ordering = sort_methods(_methods);
6632
6633 _all_mirandas = new GrowableArray<Method*>(20);
6634
6635 Handle loader(THREAD, _loader_data->class_loader());
6636 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6637 &_num_miranda_methods,
6638 _all_mirandas,
6639 _super_klass,
6640 _methods,
6641 _access_flags,
6642 _major_version,
6643 loader,
6644 _class_name,
6645 _local_interfaces,
6646 CHECK);
6647
6648 // Size of Java itable (in words)
6649 _itable_size = _access_flags.is_interface() ? 0 :
6650 klassItable::compute_itable_size(_transitive_interfaces);
6651
6652 assert(_fac != NULL, "invariant");
6653 assert(_parsed_annotations != NULL, "invariant");
6654
6655
6656 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6657 if (fs.is_flattenable()) {
6658 // Pre-load value class
6659 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6660 Handle(THREAD, _loader_data->class_loader()),
6661 _protection_domain, true, CHECK);
6662 assert(klass != NULL, "Sanity check");
6663 assert(klass->access_flags().is_value_type(), "Value type expected");
6664 _has_flattenable_fields = true;
6665 }
6666 }
6667
6668 _field_info = new FieldLayoutInfo();
6669 if (UseNewLayout) {
6670 FieldLayoutBuilder lb(this, _field_info);
6671 if (this->is_value_type()) {
6672 lb.compute_inline_class_layout(CHECK);
6673 _alignment = lb.get_alignment();
6674 _first_field_offset = lb.get_first_field_offset();
6675 _exact_size_in_bytes = lb.get_exact_size_in_byte();
6676 } else {
6677 lb.compute_regular_layout(CHECK);
6678 }
6679 } else {
6680 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6681 }
6682
6683 // Compute reference type
6684 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6685
6686 }
6687
6688 void ClassFileParser::set_klass(InstanceKlass* klass) {
6689
6690 #ifdef ASSERT
6691 if (klass != NULL) {
6692 assert(NULL == _klass, "leaking?");
6693 }
6694 #endif
6695
6696 _klass = klass;
6697 }
6698
6699 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6700
6701 #ifdef ASSERT
6702 if (klass != NULL) {
6703 assert(NULL == _klass_to_deallocate, "leaking?");
6704 }
6705 #endif
6706
6707 _klass_to_deallocate = klass;
6708 }
6709
6710 // Caller responsible for ResourceMark
6711 // clone stream with rewound position
6712 const ClassFileStream* ClassFileParser::clone_stream() const {
6713 assert(_stream != NULL, "invariant");
6714
6715 return _stream->clone();
6716 }
6717
6718 // ----------------------------------------------------------------------------
6719 // debugging
6720
6721 #ifdef ASSERT
6722
6723 // return true if class_name contains no '.' (internal format is '/')
6724 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6725 if (class_name != NULL) {
6726 ResourceMark rm;
6727 char* name = class_name->as_C_string();
6728 return strchr(name, '.') == NULL;
6729 } else {
6730 return true;
6731 }
6732 }
6733
6734 #endif