1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/annotations.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/perfData.hpp"
64 #include "runtime/reflection.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/signature.hpp"
67 #include "runtime/timer.hpp"
68 #include "services/classLoadingService.hpp"
69 #include "services/threadService.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/bitMap.inline.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/exceptions.hpp"
74 #include "utilities/globalDefinitions.hpp"
75 #include "utilities/growableArray.hpp"
76 #include "utilities/macros.hpp"
77 #include "utilities/ostream.hpp"
78 #include "utilities/resourceHash.hpp"
79 #if INCLUDE_CDS
80 #include "classfile/systemDictionaryShared.hpp"
81 #endif
82 #if INCLUDE_JFR
83 #include "jfr/support/jfrTraceIdExtension.hpp"
84 #endif
85
86 // We generally try to create the oops directly when parsing, rather than
87 // allocating temporary data structures and copying the bytes twice. A
88 // temporary area is only needed when parsing utf8 entries in the constant
89 // pool and when parsing line number tables.
90
91 // We add assert in debug mode when class format is not checked.
92
93 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
94 #define JAVA_MIN_SUPPORTED_VERSION 45
95 #define JAVA_PREVIEW_MINOR_VERSION 65535
96
97 // Used for two backward compatibility reasons:
98 // - to check for new additions to the class file format in JDK1.5
99 // - to check for bug fixes in the format checker in JDK1.5
100 #define JAVA_1_5_VERSION 49
101
102 // Used for backward compatibility reasons:
103 // - to check for javac bug fixes that happened after 1.5
104 // - also used as the max version when running in jdk6
105 #define JAVA_6_VERSION 50
106
107 // Used for backward compatibility reasons:
108 // - to disallow argument and require ACC_STATIC for <clinit> methods
109 #define JAVA_7_VERSION 51
110
111 // Extension method support.
112 #define JAVA_8_VERSION 52
113
114 #define JAVA_9_VERSION 53
115
116 #define JAVA_10_VERSION 54
117
118 #define JAVA_11_VERSION 55
119
120 #define JAVA_12_VERSION 56
121
122 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
123 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
124 "Unexpected bad constant pool entry");
125 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
126 }
127
128 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
129 ConstantPool* cp,
130 const int length,
131 TRAPS) {
132 assert(stream != NULL, "invariant");
133 assert(cp != NULL, "invariant");
134
135 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
136 // this function (_current can be allocated in a register, with scalar
137 // replacement of aggregates). The _current pointer is copied back to
138 // stream() when this function returns. DON'T call another method within
139 // this method that uses stream().
140 const ClassFileStream cfs1 = *stream;
141 const ClassFileStream* const cfs = &cfs1;
142
143 assert(cfs->allocated_on_stack(), "should be local");
144 debug_only(const u1* const old_current = stream->current();)
145
146 // Used for batching symbol allocations.
147 const char* names[SymbolTable::symbol_alloc_batch_size];
148 int lengths[SymbolTable::symbol_alloc_batch_size];
149 int indices[SymbolTable::symbol_alloc_batch_size];
150 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
151 int names_count = 0;
152
153 // parsing Index 0 is unused
154 for (int index = 1; index < length; index++) {
155 // Each of the following case guarantees one more byte in the stream
156 // for the following tag or the access_flags following constant pool,
157 // so we don't need bounds-check for reading tag.
158 const u1 tag = cfs->get_u1_fast();
159 switch (tag) {
160 case JVM_CONSTANT_Class : {
161 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
162 const u2 name_index = cfs->get_u2_fast();
163 cp->klass_index_at_put(index, name_index);
164 break;
165 }
166 case JVM_CONSTANT_Fieldref: {
167 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
168 const u2 class_index = cfs->get_u2_fast();
169 const u2 name_and_type_index = cfs->get_u2_fast();
170 cp->field_at_put(index, class_index, name_and_type_index);
171 break;
172 }
173 case JVM_CONSTANT_Methodref: {
174 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
175 const u2 class_index = cfs->get_u2_fast();
176 const u2 name_and_type_index = cfs->get_u2_fast();
177 cp->method_at_put(index, class_index, name_and_type_index);
178 break;
179 }
180 case JVM_CONSTANT_InterfaceMethodref: {
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->interface_method_at_put(index, class_index, name_and_type_index);
185 break;
186 }
187 case JVM_CONSTANT_String : {
188 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
189 const u2 string_index = cfs->get_u2_fast();
190 cp->string_index_at_put(index, string_index);
191 break;
192 }
193 case JVM_CONSTANT_MethodHandle :
194 case JVM_CONSTANT_MethodType: {
195 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
196 classfile_parse_error(
197 "Class file version does not support constant tag %u in class file %s",
198 tag, CHECK);
199 }
200 if (tag == JVM_CONSTANT_MethodHandle) {
201 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
202 const u1 ref_kind = cfs->get_u1_fast();
203 const u2 method_index = cfs->get_u2_fast();
204 cp->method_handle_index_at_put(index, ref_kind, method_index);
205 }
206 else if (tag == JVM_CONSTANT_MethodType) {
207 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
208 const u2 signature_index = cfs->get_u2_fast();
209 cp->method_type_index_at_put(index, signature_index);
210 }
211 else {
212 ShouldNotReachHere();
213 }
214 break;
215 }
216 case JVM_CONSTANT_Dynamic : {
217 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
218 classfile_parse_error(
219 "Class file version does not support constant tag %u in class file %s",
220 tag, CHECK);
221 }
222 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
223 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
224 const u2 name_and_type_index = cfs->get_u2_fast();
225 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
226 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
227 }
228 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
229 break;
230 }
231 case JVM_CONSTANT_InvokeDynamic : {
232 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
233 classfile_parse_error(
234 "Class file version does not support constant tag %u in class file %s",
235 tag, CHECK);
236 }
237 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
238 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
239 const u2 name_and_type_index = cfs->get_u2_fast();
240 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
241 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
242 }
243 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
244 break;
245 }
246 case JVM_CONSTANT_Integer: {
247 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
248 const u4 bytes = cfs->get_u4_fast();
249 cp->int_at_put(index, (jint)bytes);
250 break;
251 }
252 case JVM_CONSTANT_Float: {
253 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
254 const u4 bytes = cfs->get_u4_fast();
255 cp->float_at_put(index, *(jfloat*)&bytes);
256 break;
257 }
258 case JVM_CONSTANT_Long: {
259 // A mangled type might cause you to overrun allocated memory
260 guarantee_property(index + 1 < length,
261 "Invalid constant pool entry %u in class file %s",
262 index,
263 CHECK);
264 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
265 const u8 bytes = cfs->get_u8_fast();
266 cp->long_at_put(index, bytes);
267 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
268 break;
269 }
270 case JVM_CONSTANT_Double: {
271 // A mangled type might cause you to overrun allocated memory
272 guarantee_property(index+1 < length,
273 "Invalid constant pool entry %u in class file %s",
274 index,
275 CHECK);
276 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
277 const u8 bytes = cfs->get_u8_fast();
278 cp->double_at_put(index, *(jdouble*)&bytes);
279 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
280 break;
281 }
282 case JVM_CONSTANT_NameAndType: {
283 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
284 const u2 name_index = cfs->get_u2_fast();
285 const u2 signature_index = cfs->get_u2_fast();
286 cp->name_and_type_at_put(index, name_index, signature_index);
287 break;
288 }
289 case JVM_CONSTANT_Utf8 : {
290 cfs->guarantee_more(2, CHECK); // utf8_length
291 u2 utf8_length = cfs->get_u2_fast();
292 const u1* utf8_buffer = cfs->current();
293 assert(utf8_buffer != NULL, "null utf8 buffer");
294 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
295 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
296 cfs->skip_u1_fast(utf8_length);
297
298 // Before storing the symbol, make sure it's legal
299 if (_need_verify) {
300 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
301 }
302
303 if (has_cp_patch_at(index)) {
304 Handle patch = clear_cp_patch_at(index);
305 guarantee_property(java_lang_String::is_instance(patch()),
306 "Illegal utf8 patch at %d in class file %s",
307 index,
308 CHECK);
309 const char* const str = java_lang_String::as_utf8_string(patch());
310 // (could use java_lang_String::as_symbol instead, but might as well batch them)
311 utf8_buffer = (const u1*) str;
312 utf8_length = (int) strlen(str);
313 }
314
315 unsigned int hash;
316 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
317 utf8_length,
318 hash);
319 if (result == NULL) {
320 names[names_count] = (const char*)utf8_buffer;
321 lengths[names_count] = utf8_length;
322 indices[names_count] = index;
323 hashValues[names_count++] = hash;
324 if (names_count == SymbolTable::symbol_alloc_batch_size) {
325 SymbolTable::new_symbols(_loader_data,
326 cp,
327 names_count,
328 names,
329 lengths,
330 indices,
331 hashValues,
332 CHECK);
333 names_count = 0;
334 }
335 } else {
336 cp->symbol_at_put(index, result);
337 }
338 break;
339 }
340 case 19:
341 case 20: {
342 // Record that an error occurred in these two cases but keep parsing so
343 // that ACC_Module can be checked for in the access_flags. Need to
344 // throw NoClassDefFoundError in that case.
345 if (_major_version >= JAVA_9_VERSION) {
346 cfs->guarantee_more(3, CHECK);
347 cfs->get_u2_fast();
348 set_class_bad_constant_seen(tag);
349 break;
350 }
351 }
352 default: {
353 classfile_parse_error("Unknown constant tag %u in class file %s",
354 tag,
355 CHECK);
356 break;
357 }
358 } // end of switch(tag)
359 } // end of for
360
361 // Allocate the remaining symbols
362 if (names_count > 0) {
363 SymbolTable::new_symbols(_loader_data,
364 cp,
365 names_count,
366 names,
367 lengths,
368 indices,
369 hashValues,
370 CHECK);
371 }
372
373 // Copy _current pointer of local copy back to stream.
374 assert(stream->current() == old_current, "non-exclusive use of stream");
375 stream->set_current(cfs1.current());
376
377 }
378
379 static inline bool valid_cp_range(int index, int length) {
380 return (index > 0 && index < length);
381 }
382
383 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
384 assert(cp != NULL, "invariant");
385 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
386 return cp->symbol_at(index);
387 }
388 return NULL;
389 }
390
391 #ifdef ASSERT
392 PRAGMA_DIAG_PUSH
393 PRAGMA_FORMAT_NONLITERAL_IGNORED
394 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
395 ResourceMark rm(THREAD);
396 fatal(msg, _class_name->as_C_string());
397 }
398
399 void ClassFileParser::report_assert_property_failure(const char* msg,
400 int index,
401 TRAPS) const {
402 ResourceMark rm(THREAD);
403 fatal(msg, index, _class_name->as_C_string());
404 }
405 PRAGMA_DIAG_POP
406 #endif
407
408 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
409 ConstantPool* const cp,
410 const int length,
411 TRAPS) {
412 assert(cp != NULL, "invariant");
413 assert(stream != NULL, "invariant");
414
415 // parsing constant pool entries
416 parse_constant_pool_entries(stream, cp, length, CHECK);
417 if (class_bad_constant_seen() != 0) {
418 // a bad CP entry has been detected previously so stop parsing and just return.
419 return;
420 }
421
422 int index = 1; // declared outside of loops for portability
423 int num_klasses = 0;
424
425 // first verification pass - validate cross references
426 // and fixup class and string constants
427 for (index = 1; index < length; index++) { // Index 0 is unused
428 const jbyte tag = cp->tag_at(index).value();
429 switch (tag) {
430 case JVM_CONSTANT_Class: {
431 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
432 break;
433 }
434 case JVM_CONSTANT_Fieldref:
435 // fall through
436 case JVM_CONSTANT_Methodref:
437 // fall through
438 case JVM_CONSTANT_InterfaceMethodref: {
439 if (!_need_verify) break;
440 const int klass_ref_index = cp->klass_ref_index_at(index);
441 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
442 check_property(valid_klass_reference_at(klass_ref_index),
443 "Invalid constant pool index %u in class file %s",
444 klass_ref_index, CHECK);
445 check_property(valid_cp_range(name_and_type_ref_index, length) &&
446 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
447 "Invalid constant pool index %u in class file %s",
448 name_and_type_ref_index, CHECK);
449 break;
450 }
451 case JVM_CONSTANT_String: {
452 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
453 break;
454 }
455 case JVM_CONSTANT_Integer:
456 break;
457 case JVM_CONSTANT_Float:
458 break;
459 case JVM_CONSTANT_Long:
460 case JVM_CONSTANT_Double: {
461 index++;
462 check_property(
463 (index < length && cp->tag_at(index).is_invalid()),
464 "Improper constant pool long/double index %u in class file %s",
465 index, CHECK);
466 break;
467 }
468 case JVM_CONSTANT_NameAndType: {
469 if (!_need_verify) break;
470 const int name_ref_index = cp->name_ref_index_at(index);
471 const int signature_ref_index = cp->signature_ref_index_at(index);
472 check_property(valid_symbol_at(name_ref_index),
473 "Invalid constant pool index %u in class file %s",
474 name_ref_index, CHECK);
475 check_property(valid_symbol_at(signature_ref_index),
476 "Invalid constant pool index %u in class file %s",
477 signature_ref_index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_Utf8:
481 break;
482 case JVM_CONSTANT_UnresolvedClass: // fall-through
483 case JVM_CONSTANT_UnresolvedClassInError: {
484 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
485 break;
486 }
487 case JVM_CONSTANT_ClassIndex: {
488 const int class_index = cp->klass_index_at(index);
489 check_property(valid_symbol_at(class_index),
490 "Invalid constant pool index %u in class file %s",
491 class_index, CHECK);
492 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
493 break;
494 }
495 case JVM_CONSTANT_StringIndex: {
496 const int string_index = cp->string_index_at(index);
497 check_property(valid_symbol_at(string_index),
498 "Invalid constant pool index %u in class file %s",
499 string_index, CHECK);
500 Symbol* const sym = cp->symbol_at(string_index);
501 cp->unresolved_string_at_put(index, sym);
502 break;
503 }
504 case JVM_CONSTANT_MethodHandle: {
505 const int ref_index = cp->method_handle_index_at(index);
506 check_property(valid_cp_range(ref_index, length),
507 "Invalid constant pool index %u in class file %s",
508 ref_index, CHECK);
509 const constantTag tag = cp->tag_at(ref_index);
510 const int ref_kind = cp->method_handle_ref_kind_at(index);
511
512 switch (ref_kind) {
513 case JVM_REF_getField:
514 case JVM_REF_getStatic:
515 case JVM_REF_putField:
516 case JVM_REF_putStatic: {
517 check_property(
518 tag.is_field(),
519 "Invalid constant pool index %u in class file %s (not a field)",
520 ref_index, CHECK);
521 break;
522 }
523 case JVM_REF_invokeVirtual:
524 case JVM_REF_newInvokeSpecial: {
525 check_property(
526 tag.is_method(),
527 "Invalid constant pool index %u in class file %s (not a method)",
528 ref_index, CHECK);
529 break;
530 }
531 case JVM_REF_invokeStatic:
532 case JVM_REF_invokeSpecial: {
533 check_property(
534 tag.is_method() ||
535 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
536 "Invalid constant pool index %u in class file %s (not a method)",
537 ref_index, CHECK);
538 break;
539 }
540 case JVM_REF_invokeInterface: {
541 check_property(
542 tag.is_interface_method(),
543 "Invalid constant pool index %u in class file %s (not an interface method)",
544 ref_index, CHECK);
545 break;
546 }
547 default: {
548 classfile_parse_error(
549 "Bad method handle kind at constant pool index %u in class file %s",
550 index, CHECK);
551 }
552 } // switch(refkind)
553 // Keep the ref_index unchanged. It will be indirected at link-time.
554 break;
555 } // case MethodHandle
556 case JVM_CONSTANT_MethodType: {
557 const int ref_index = cp->method_type_index_at(index);
558 check_property(valid_symbol_at(ref_index),
559 "Invalid constant pool index %u in class file %s",
560 ref_index, CHECK);
561 break;
562 }
563 case JVM_CONSTANT_Dynamic: {
564 const int name_and_type_ref_index =
565 cp->invoke_dynamic_name_and_type_ref_index_at(index);
566
567 check_property(valid_cp_range(name_and_type_ref_index, length) &&
568 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
569 "Invalid constant pool index %u in class file %s",
570 name_and_type_ref_index, CHECK);
571 // bootstrap specifier index must be checked later,
572 // when BootstrapMethods attr is available
573
574 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
575 cp->set_has_dynamic_constant();
576 break;
577 }
578 case JVM_CONSTANT_InvokeDynamic: {
579 const int name_and_type_ref_index =
580 cp->invoke_dynamic_name_and_type_ref_index_at(index);
581
582 check_property(valid_cp_range(name_and_type_ref_index, length) &&
583 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
584 "Invalid constant pool index %u in class file %s",
585 name_and_type_ref_index, CHECK);
586 // bootstrap specifier index must be checked later,
587 // when BootstrapMethods attr is available
588 break;
589 }
590 default: {
591 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
592 ShouldNotReachHere();
593 break;
594 }
595 } // switch(tag)
596 } // end of for
597
598 _first_patched_klass_resolved_index = num_klasses;
599 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
600
601 if (_cp_patches != NULL) {
602 // need to treat this_class specially...
603
604 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
605 // for now. These will be replaced with actual names of the patched classes in patch_class().
606 Symbol* s = vmSymbols::star_name();
607 for (int n=_orig_cp_size; n<cp->length(); n++) {
608 cp->symbol_at_put(n, s);
609 }
610
611 int this_class_index;
612 {
613 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
614 const u1* const mark = stream->current();
615 stream->skip_u2_fast(1); // skip flags
616 this_class_index = stream->get_u2_fast();
617 stream->set_current(mark); // revert to mark
618 }
619
620 for (index = 1; index < length; index++) { // Index 0 is unused
621 if (has_cp_patch_at(index)) {
622 guarantee_property(index != this_class_index,
623 "Illegal constant pool patch to self at %d in class file %s",
624 index, CHECK);
625 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
626 }
627 }
628 }
629
630 if (!_need_verify) {
631 return;
632 }
633
634 // second verification pass - checks the strings are of the right format.
635 // but not yet to the other entries
636 for (index = 1; index < length; index++) {
637 const jbyte tag = cp->tag_at(index).value();
638 switch (tag) {
639 case JVM_CONSTANT_UnresolvedClass: {
640 const Symbol* const class_name = cp->klass_name_at(index);
641 // check the name, even if _cp_patches will overwrite it
642 verify_legal_class_name(class_name, CHECK);
643 break;
644 }
645 case JVM_CONSTANT_NameAndType: {
646 if (_need_verify) {
647 const int sig_index = cp->signature_ref_index_at(index);
648 const int name_index = cp->name_ref_index_at(index);
649 const Symbol* const name = cp->symbol_at(name_index);
650 const Symbol* const sig = cp->symbol_at(sig_index);
651 guarantee_property(sig->utf8_length() != 0,
652 "Illegal zero length constant pool entry at %d in class %s",
653 sig_index, CHECK);
654 guarantee_property(name->utf8_length() != 0,
655 "Illegal zero length constant pool entry at %d in class %s",
656 name_index, CHECK);
657
658 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
659 // Format check method name and signature
660 verify_legal_method_name(name, CHECK);
661 verify_legal_method_signature(name, sig, CHECK);
662 } else {
663 // Format check field name and signature
664 verify_legal_field_name(name, CHECK);
665 verify_legal_field_signature(name, sig, CHECK);
666 }
667 }
668 break;
669 }
670 case JVM_CONSTANT_Dynamic: {
671 const int name_and_type_ref_index =
672 cp->name_and_type_ref_index_at(index);
673 // already verified to be utf8
674 const int name_ref_index =
675 cp->name_ref_index_at(name_and_type_ref_index);
676 // already verified to be utf8
677 const int signature_ref_index =
678 cp->signature_ref_index_at(name_and_type_ref_index);
679 const Symbol* const name = cp->symbol_at(name_ref_index);
680 const Symbol* const signature = cp->symbol_at(signature_ref_index);
681 if (_need_verify) {
682 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
683 // Need only to be sure signature is non-zero length and the right type.
684 if (signature->utf8_length() == 0 ||
685 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
686 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
687 }
688 }
689 break;
690 }
691 case JVM_CONSTANT_InvokeDynamic:
692 case JVM_CONSTANT_Fieldref:
693 case JVM_CONSTANT_Methodref:
694 case JVM_CONSTANT_InterfaceMethodref: {
695 const int name_and_type_ref_index =
696 cp->name_and_type_ref_index_at(index);
697 // already verified to be utf8
698 const int name_ref_index =
699 cp->name_ref_index_at(name_and_type_ref_index);
700 // already verified to be utf8
701 const int signature_ref_index =
702 cp->signature_ref_index_at(name_and_type_ref_index);
703 const Symbol* const name = cp->symbol_at(name_ref_index);
704 const Symbol* const signature = cp->symbol_at(signature_ref_index);
705 if (tag == JVM_CONSTANT_Fieldref) {
706 if (_need_verify) {
707 // Field name and signature are verified above, when iterating NameAndType_info.
708 // Need only to be sure signature is non-zero length and the right type.
709 if (signature->utf8_length() == 0 ||
710 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
711 throwIllegalSignature("Field", name, signature, CHECK);
712 }
713 }
714 } else {
715 if (_need_verify) {
716 // Method name and signature are verified above, when iterating NameAndType_info.
717 // Need only to be sure signature is non-zero length and the right type.
718 if (signature->utf8_length() == 0 ||
719 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
720 throwIllegalSignature("Method", name, signature, CHECK);
721 }
722 }
723 // 4509014: If a class method name begins with '<', it must be "<init>"
724 const unsigned int name_len = name->utf8_length();
725 if (tag == JVM_CONSTANT_Methodref &&
726 name_len != 0 &&
727 name->byte_at(0) == '<' &&
728 name != vmSymbols::object_initializer_name()) {
729 classfile_parse_error(
730 "Bad method name at constant pool index %u in class file %s",
731 name_ref_index, CHECK);
732 }
733 }
734 break;
735 }
736 case JVM_CONSTANT_MethodHandle: {
737 const int ref_index = cp->method_handle_index_at(index);
738 const int ref_kind = cp->method_handle_ref_kind_at(index);
739 switch (ref_kind) {
740 case JVM_REF_invokeVirtual:
741 case JVM_REF_invokeStatic:
742 case JVM_REF_invokeSpecial:
743 case JVM_REF_newInvokeSpecial: {
744 const int name_and_type_ref_index =
745 cp->name_and_type_ref_index_at(ref_index);
746 const int name_ref_index =
747 cp->name_ref_index_at(name_and_type_ref_index);
748 const Symbol* const name = cp->symbol_at(name_ref_index);
749 if (ref_kind == JVM_REF_newInvokeSpecial) {
750 if (name != vmSymbols::object_initializer_name()) {
751 classfile_parse_error(
752 "Bad constructor name at constant pool index %u in class file %s",
753 name_ref_index, CHECK);
754 }
755 } else {
756 if (name == vmSymbols::object_initializer_name()) {
757 classfile_parse_error(
758 "Bad method name at constant pool index %u in class file %s",
759 name_ref_index, CHECK);
760 }
761 }
762 break;
763 }
764 // Other ref_kinds are already fully checked in previous pass.
765 } // switch(ref_kind)
766 break;
767 }
768 case JVM_CONSTANT_MethodType: {
769 const Symbol* const no_name = vmSymbols::type_name(); // place holder
770 const Symbol* const signature = cp->method_type_signature_at(index);
771 verify_legal_method_signature(no_name, signature, CHECK);
772 break;
773 }
774 case JVM_CONSTANT_Utf8: {
775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
776 }
777 } // switch(tag)
778 } // end of for
779 }
780
781 Handle ClassFileParser::clear_cp_patch_at(int index) {
782 Handle patch = cp_patch_at(index);
783 _cp_patches->at_put(index, Handle());
784 assert(!has_cp_patch_at(index), "");
785 return patch;
786 }
787
788 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
789 int name_index = _orig_cp_size + _num_patched_klasses;
790 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
791
792 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
793 _num_patched_klasses ++;
794 }
795
796 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
797 int index,
798 Handle patch,
799 TRAPS) {
800 assert(cp != NULL, "invariant");
801
802 BasicType patch_type = T_VOID;
803
804 switch (cp->tag_at(index).value()) {
805
806 case JVM_CONSTANT_UnresolvedClass: {
807 // Patching a class means pre-resolving it.
808 // The name in the constant pool is ignored.
809 if (java_lang_Class::is_instance(patch())) {
810 guarantee_property(!java_lang_Class::is_primitive(patch()),
811 "Illegal class patch at %d in class file %s",
812 index, CHECK);
813 Klass* k = java_lang_Class::as_Klass(patch());
814 patch_class(cp, index, k, k->name());
815 } else {
816 guarantee_property(java_lang_String::is_instance(patch()),
817 "Illegal class patch at %d in class file %s",
818 index, CHECK);
819 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
820 patch_class(cp, index, NULL, name);
821 }
822 break;
823 }
824
825 case JVM_CONSTANT_String: {
826 // skip this patch and don't clear it. Needs the oop array for resolved
827 // references to be created first.
828 return;
829 }
830 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
831 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
832 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
833 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
834 patch_prim:
835 {
836 jvalue value;
837 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
838 guarantee_property(value_type == patch_type,
839 "Illegal primitive patch at %d in class file %s",
840 index, CHECK);
841 switch (value_type) {
842 case T_INT: cp->int_at_put(index, value.i); break;
843 case T_FLOAT: cp->float_at_put(index, value.f); break;
844 case T_LONG: cp->long_at_put(index, value.j); break;
845 case T_DOUBLE: cp->double_at_put(index, value.d); break;
846 default: assert(false, "");
847 }
848 } // end patch_prim label
849 break;
850
851 default: {
852 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
853 guarantee_property(!has_cp_patch_at(index),
854 "Illegal unexpected patch at %d in class file %s",
855 index, CHECK);
856 return;
857 }
858 } // end of switch(tag)
859
860 // On fall-through, mark the patch as used.
861 clear_cp_patch_at(index);
862 }
863 class NameSigHash: public ResourceObj {
864 public:
865 const Symbol* _name; // name
866 const Symbol* _sig; // signature
867 NameSigHash* _next; // Next entry in hash table
868 };
869
870 static const int HASH_ROW_SIZE = 256;
871
872 static unsigned int hash(const Symbol* name, const Symbol* sig) {
873 unsigned int raw_hash = 0;
874 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
875 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
876
877 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
878 }
879
880
881 static void initialize_hashtable(NameSigHash** table) {
882 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
883 }
884 // Return false if the name/sig combination is found in table.
885 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
886 // The old format checker uses heap sort to find duplicates.
887 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
888 // of table since we don't expect Symbol*'s to move.
889 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
890 assert(name != NULL, "name in constant pool is NULL");
891
892 // First lookup for duplicates
893 int index = hash(name, sig);
894 NameSigHash* entry = table[index];
895 while (entry != NULL) {
896 if (entry->_name == name && entry->_sig == sig) {
897 return false;
898 }
899 entry = entry->_next;
900 }
901
902 // No duplicate is found, allocate a new entry and fill it.
903 entry = new NameSigHash();
904 entry->_name = name;
905 entry->_sig = sig;
906
907 // Insert into hash table
908 entry->_next = table[index];
909 table[index] = entry;
910
911 return true;
912 }
913
914 // Side-effects: populates the _local_interfaces field
915 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
916 const int itfs_len,
917 ConstantPool* const cp,
918 bool* const has_nonstatic_concrete_methods,
919 TRAPS) {
920 assert(stream != NULL, "invariant");
921 assert(cp != NULL, "invariant");
922 assert(has_nonstatic_concrete_methods != NULL, "invariant");
923
924 if (itfs_len == 0) {
925 _local_interfaces = Universe::the_empty_klass_array();
926 } else {
927 assert(itfs_len > 0, "only called for len>0");
928 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
929
930 int index;
931 for (index = 0; index < itfs_len; index++) {
932 const u2 interface_index = stream->get_u2(CHECK);
933 Klass* interf;
934 check_property(
935 valid_klass_reference_at(interface_index),
936 "Interface name has bad constant pool index %u in class file %s",
937 interface_index, CHECK);
938 if (cp->tag_at(interface_index).is_klass()) {
939 interf = cp->resolved_klass_at(interface_index);
940 } else {
941 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
942
943 // Don't need to check legal name because it's checked when parsing constant pool.
944 // But need to make sure it's not an array type.
945 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
946 "Bad interface name in class file %s", CHECK);
947
948 // Call resolve_super so classcircularity is checked
949 interf = SystemDictionary::resolve_super_or_fail(
950 _class_name,
951 unresolved_klass,
952 Handle(THREAD, _loader_data->class_loader()),
953 _protection_domain,
954 false,
955 CHECK);
956 }
957
958 if (!interf->is_interface()) {
959 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
960 err_msg("Class %s can not implement %s, because it is not an interface",
961 _class_name->as_klass_external_name(),
962 interf->class_loader_and_module_name()));
963 }
964
965 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
966 *has_nonstatic_concrete_methods = true;
967 }
968 _local_interfaces->at_put(index, interf);
969 }
970
971 if (!_need_verify || itfs_len <= 1) {
972 return;
973 }
974
975 // Check if there's any duplicates in interfaces
976 ResourceMark rm(THREAD);
977 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
978 NameSigHash*,
979 HASH_ROW_SIZE);
980 initialize_hashtable(interface_names);
981 bool dup = false;
982 const Symbol* name = NULL;
983 {
984 debug_only(NoSafepointVerifier nsv;)
985 for (index = 0; index < itfs_len; index++) {
986 const Klass* const k = _local_interfaces->at(index);
987 name = InstanceKlass::cast(k)->name();
988 // If no duplicates, add (name, NULL) in hashtable interface_names.
989 if (!put_after_lookup(name, NULL, interface_names)) {
990 dup = true;
991 break;
992 }
993 }
994 }
995 if (dup) {
996 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
997 name->as_C_string(), CHECK);
998 }
999 }
1000 }
1001
1002 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1003 int constantvalue_index,
1004 int signature_index,
1005 TRAPS) const {
1006 // Make sure the constant pool entry is of a type appropriate to this field
1007 guarantee_property(
1008 (constantvalue_index > 0 &&
1009 constantvalue_index < cp->length()),
1010 "Bad initial value index %u in ConstantValue attribute in class file %s",
1011 constantvalue_index, CHECK);
1012
1013 const constantTag value_type = cp->tag_at(constantvalue_index);
1014 switch(cp->basic_type_for_signature_at(signature_index)) {
1015 case T_LONG: {
1016 guarantee_property(value_type.is_long(),
1017 "Inconsistent constant value type in class file %s",
1018 CHECK);
1019 break;
1020 }
1021 case T_FLOAT: {
1022 guarantee_property(value_type.is_float(),
1023 "Inconsistent constant value type in class file %s",
1024 CHECK);
1025 break;
1026 }
1027 case T_DOUBLE: {
1028 guarantee_property(value_type.is_double(),
1029 "Inconsistent constant value type in class file %s",
1030 CHECK);
1031 break;
1032 }
1033 case T_BYTE:
1034 case T_CHAR:
1035 case T_SHORT:
1036 case T_BOOLEAN:
1037 case T_INT: {
1038 guarantee_property(value_type.is_int(),
1039 "Inconsistent constant value type in class file %s",
1040 CHECK);
1041 break;
1042 }
1043 case T_OBJECT: {
1044 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1045 && value_type.is_string()),
1046 "Bad string initial value in class file %s",
1047 CHECK);
1048 break;
1049 }
1050 default: {
1051 classfile_parse_error("Unable to set initial value %u in class file %s",
1052 constantvalue_index,
1053 CHECK);
1054 }
1055 }
1056 }
1057
1058 class AnnotationCollector : public ResourceObj{
1059 public:
1060 enum Location { _in_field, _in_method, _in_class };
1061 enum ID {
1062 _unknown = 0,
1063 _method_CallerSensitive,
1064 _method_ForceInline,
1065 _method_DontInline,
1066 _method_InjectedProfile,
1067 _method_LambdaForm_Compiled,
1068 _method_LambdaForm_Hidden,
1069 _method_HotSpotIntrinsicCandidate,
1070 _jdk_internal_vm_annotation_Contended,
1071 _field_Stable,
1072 _jdk_internal_vm_annotation_ReservedStackAccess,
1073 _annotation_LIMIT
1074 };
1075 const Location _location;
1076 int _annotations_present;
1077 u2 _contended_group;
1078
1079 AnnotationCollector(Location location)
1080 : _location(location), _annotations_present(0)
1081 {
1082 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1083 }
1084 // If this annotation name has an ID, report it (or _none).
1085 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1086 // Set the annotation name:
1087 void set_annotation(ID id) {
1088 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1089 _annotations_present |= nth_bit((int)id);
1090 }
1091
1092 void remove_annotation(ID id) {
1093 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1094 _annotations_present &= ~nth_bit((int)id);
1095 }
1096
1097 // Report if the annotation is present.
1098 bool has_any_annotations() const { return _annotations_present != 0; }
1099 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1100
1101 void set_contended_group(u2 group) { _contended_group = group; }
1102 u2 contended_group() const { return _contended_group; }
1103
1104 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1105
1106 void set_stable(bool stable) { set_annotation(_field_Stable); }
1107 bool is_stable() const { return has_annotation(_field_Stable); }
1108 };
1109
1110 // This class also doubles as a holder for metadata cleanup.
1111 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1112 private:
1113 ClassLoaderData* _loader_data;
1114 AnnotationArray* _field_annotations;
1115 AnnotationArray* _field_type_annotations;
1116 public:
1117 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1118 AnnotationCollector(_in_field),
1119 _loader_data(loader_data),
1120 _field_annotations(NULL),
1121 _field_type_annotations(NULL) {}
1122 ~FieldAnnotationCollector();
1123 void apply_to(FieldInfo* f);
1124 AnnotationArray* field_annotations() { return _field_annotations; }
1125 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1126
1127 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1128 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1129 };
1130
1131 class MethodAnnotationCollector : public AnnotationCollector{
1132 public:
1133 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1134 void apply_to(const methodHandle& m);
1135 };
1136
1137 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1138 public:
1139 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1140 void apply_to(InstanceKlass* ik);
1141 };
1142
1143
1144 static int skip_annotation_value(const u1*, int, int); // fwd decl
1145
1146 // Safely increment index by val if does not pass limit
1147 #define SAFE_ADD(index, limit, val) \
1148 if (index >= limit - val) return limit; \
1149 index += val;
1150
1151 // Skip an annotation. Return >=limit if there is any problem.
1152 static int skip_annotation(const u1* buffer, int limit, int index) {
1153 assert(buffer != NULL, "invariant");
1154 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1155 // value := switch (tag:u1) { ... }
1156 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1157 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1158 while (--nmem >= 0 && index < limit) {
1159 SAFE_ADD(index, limit, 2); // skip member
1160 index = skip_annotation_value(buffer, limit, index);
1161 }
1162 return index;
1163 }
1164
1165 // Skip an annotation value. Return >=limit if there is any problem.
1166 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1167 assert(buffer != NULL, "invariant");
1168
1169 // value := switch (tag:u1) {
1170 // case B, C, I, S, Z, D, F, J, c: con:u2;
1171 // case e: e_class:u2 e_name:u2;
1172 // case s: s_con:u2;
1173 // case [: do(nval:u2) {value};
1174 // case @: annotation;
1175 // case s: s_con:u2;
1176 // }
1177 SAFE_ADD(index, limit, 1); // read tag
1178 const u1 tag = buffer[index - 1];
1179 switch (tag) {
1180 case 'B':
1181 case 'C':
1182 case 'I':
1183 case 'S':
1184 case 'Z':
1185 case 'D':
1186 case 'F':
1187 case 'J':
1188 case 'c':
1189 case 's':
1190 SAFE_ADD(index, limit, 2); // skip con or s_con
1191 break;
1192 case 'e':
1193 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1194 break;
1195 case '[':
1196 {
1197 SAFE_ADD(index, limit, 2); // read nval
1198 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1199 while (--nval >= 0 && index < limit) {
1200 index = skip_annotation_value(buffer, limit, index);
1201 }
1202 }
1203 break;
1204 case '@':
1205 index = skip_annotation(buffer, limit, index);
1206 break;
1207 default:
1208 return limit; // bad tag byte
1209 }
1210 return index;
1211 }
1212
1213 // Sift through annotations, looking for those significant to the VM:
1214 static void parse_annotations(const ConstantPool* const cp,
1215 const u1* buffer, int limit,
1216 AnnotationCollector* coll,
1217 ClassLoaderData* loader_data,
1218 TRAPS) {
1219
1220 assert(cp != NULL, "invariant");
1221 assert(buffer != NULL, "invariant");
1222 assert(coll != NULL, "invariant");
1223 assert(loader_data != NULL, "invariant");
1224
1225 // annotations := do(nann:u2) {annotation}
1226 int index = 2; // read nann
1227 if (index >= limit) return;
1228 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1229 enum { // initial annotation layout
1230 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1231 count_off = 2, // u2 such as 1 (one value)
1232 member_off = 4, // utf8 such as 'value'
1233 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1234 e_tag_val = 'e',
1235 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1236 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1237 e_size = 11, // end of 'e' annotation
1238 c_tag_val = 'c', // payload is type
1239 c_con_off = 7, // utf8 payload, such as 'I'
1240 c_size = 9, // end of 'c' annotation
1241 s_tag_val = 's', // payload is String
1242 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1243 s_size = 9,
1244 min_size = 6 // smallest possible size (zero members)
1245 };
1246 // Cannot add min_size to index in case of overflow MAX_INT
1247 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1248 int index0 = index;
1249 index = skip_annotation(buffer, limit, index);
1250 const u1* const abase = buffer + index0;
1251 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1252 const int count = Bytes::get_Java_u2((address)abase + count_off);
1253 const Symbol* const aname = check_symbol_at(cp, atype);
1254 if (aname == NULL) break; // invalid annotation name
1255 const Symbol* member = NULL;
1256 if (count >= 1) {
1257 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1258 member = check_symbol_at(cp, member_index);
1259 if (member == NULL) break; // invalid member name
1260 }
1261
1262 // Here is where parsing particular annotations will take place.
1263 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1264 if (AnnotationCollector::_unknown == id) continue;
1265 coll->set_annotation(id);
1266
1267 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1268 // @Contended can optionally specify the contention group.
1269 //
1270 // Contended group defines the equivalence class over the fields:
1271 // the fields within the same contended group are not treated distinct.
1272 // The only exception is default group, which does not incur the
1273 // equivalence. Naturally, contention group for classes is meaningless.
1274 //
1275 // While the contention group is specified as String, annotation
1276 // values are already interned, and we might as well use the constant
1277 // pool index as the group tag.
1278 //
1279 u2 group_index = 0; // default contended group
1280 if (count == 1
1281 && s_size == (index - index0) // match size
1282 && s_tag_val == *(abase + tag_off)
1283 && member == vmSymbols::value_name()) {
1284 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1285 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1286 group_index = 0; // default contended group
1287 }
1288 }
1289 coll->set_contended_group(group_index);
1290 }
1291 }
1292 }
1293
1294
1295 // Parse attributes for a field.
1296 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1297 u2 attributes_count,
1298 bool is_static, u2 signature_index,
1299 u2* const constantvalue_index_addr,
1300 bool* const is_synthetic_addr,
1301 u2* const generic_signature_index_addr,
1302 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1303 TRAPS) {
1304 assert(cfs != NULL, "invariant");
1305 assert(constantvalue_index_addr != NULL, "invariant");
1306 assert(is_synthetic_addr != NULL, "invariant");
1307 assert(generic_signature_index_addr != NULL, "invariant");
1308 assert(parsed_annotations != NULL, "invariant");
1309 assert(attributes_count > 0, "attributes_count should be greater than 0");
1310
1311 u2 constantvalue_index = 0;
1312 u2 generic_signature_index = 0;
1313 bool is_synthetic = false;
1314 const u1* runtime_visible_annotations = NULL;
1315 int runtime_visible_annotations_length = 0;
1316 const u1* runtime_invisible_annotations = NULL;
1317 int runtime_invisible_annotations_length = 0;
1318 const u1* runtime_visible_type_annotations = NULL;
1319 int runtime_visible_type_annotations_length = 0;
1320 const u1* runtime_invisible_type_annotations = NULL;
1321 int runtime_invisible_type_annotations_length = 0;
1322 bool runtime_invisible_annotations_exists = false;
1323 bool runtime_invisible_type_annotations_exists = false;
1324 const ConstantPool* const cp = _cp;
1325
1326 while (attributes_count--) {
1327 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1328 const u2 attribute_name_index = cfs->get_u2_fast();
1329 const u4 attribute_length = cfs->get_u4_fast();
1330 check_property(valid_symbol_at(attribute_name_index),
1331 "Invalid field attribute index %u in class file %s",
1332 attribute_name_index,
1333 CHECK);
1334
1335 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1336 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1337 // ignore if non-static
1338 if (constantvalue_index != 0) {
1339 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1340 }
1341 check_property(
1342 attribute_length == 2,
1343 "Invalid ConstantValue field attribute length %u in class file %s",
1344 attribute_length, CHECK);
1345
1346 constantvalue_index = cfs->get_u2(CHECK);
1347 if (_need_verify) {
1348 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1349 }
1350 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1351 if (attribute_length != 0) {
1352 classfile_parse_error(
1353 "Invalid Synthetic field attribute length %u in class file %s",
1354 attribute_length, CHECK);
1355 }
1356 is_synthetic = true;
1357 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1358 if (attribute_length != 0) {
1359 classfile_parse_error(
1360 "Invalid Deprecated field attribute length %u in class file %s",
1361 attribute_length, CHECK);
1362 }
1363 } else if (_major_version >= JAVA_1_5_VERSION) {
1364 if (attribute_name == vmSymbols::tag_signature()) {
1365 if (generic_signature_index != 0) {
1366 classfile_parse_error(
1367 "Multiple Signature attributes for field in class file %s", CHECK);
1368 }
1369 if (attribute_length != 2) {
1370 classfile_parse_error(
1371 "Wrong size %u for field's Signature attribute in class file %s",
1372 attribute_length, CHECK);
1373 }
1374 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1375 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1376 if (runtime_visible_annotations != NULL) {
1377 classfile_parse_error(
1378 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1379 }
1380 runtime_visible_annotations_length = attribute_length;
1381 runtime_visible_annotations = cfs->current();
1382 assert(runtime_visible_annotations != NULL, "null visible annotations");
1383 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1384 parse_annotations(cp,
1385 runtime_visible_annotations,
1386 runtime_visible_annotations_length,
1387 parsed_annotations,
1388 _loader_data,
1389 CHECK);
1390 cfs->skip_u1_fast(runtime_visible_annotations_length);
1391 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1392 if (runtime_invisible_annotations_exists) {
1393 classfile_parse_error(
1394 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1395 }
1396 runtime_invisible_annotations_exists = true;
1397 if (PreserveAllAnnotations) {
1398 runtime_invisible_annotations_length = attribute_length;
1399 runtime_invisible_annotations = cfs->current();
1400 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1401 }
1402 cfs->skip_u1(attribute_length, CHECK);
1403 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1404 if (runtime_visible_type_annotations != NULL) {
1405 classfile_parse_error(
1406 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1407 }
1408 runtime_visible_type_annotations_length = attribute_length;
1409 runtime_visible_type_annotations = cfs->current();
1410 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1411 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1412 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1413 if (runtime_invisible_type_annotations_exists) {
1414 classfile_parse_error(
1415 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1416 } else {
1417 runtime_invisible_type_annotations_exists = true;
1418 }
1419 if (PreserveAllAnnotations) {
1420 runtime_invisible_type_annotations_length = attribute_length;
1421 runtime_invisible_type_annotations = cfs->current();
1422 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1423 }
1424 cfs->skip_u1(attribute_length, CHECK);
1425 } else {
1426 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1427 }
1428 } else {
1429 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1430 }
1431 }
1432
1433 *constantvalue_index_addr = constantvalue_index;
1434 *is_synthetic_addr = is_synthetic;
1435 *generic_signature_index_addr = generic_signature_index;
1436 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1437 runtime_visible_annotations_length,
1438 runtime_invisible_annotations,
1439 runtime_invisible_annotations_length,
1440 CHECK);
1441 parsed_annotations->set_field_annotations(a);
1442 a = assemble_annotations(runtime_visible_type_annotations,
1443 runtime_visible_type_annotations_length,
1444 runtime_invisible_type_annotations,
1445 runtime_invisible_type_annotations_length,
1446 CHECK);
1447 parsed_annotations->set_field_type_annotations(a);
1448 return;
1449 }
1450
1451
1452 // Field allocation types. Used for computing field offsets.
1453
1454 enum FieldAllocationType {
1455 STATIC_OOP, // Oops
1456 STATIC_BYTE, // Boolean, Byte, char
1457 STATIC_SHORT, // shorts
1458 STATIC_WORD, // ints
1459 STATIC_DOUBLE, // aligned long or double
1460 NONSTATIC_OOP,
1461 NONSTATIC_BYTE,
1462 NONSTATIC_SHORT,
1463 NONSTATIC_WORD,
1464 NONSTATIC_DOUBLE,
1465 MAX_FIELD_ALLOCATION_TYPE,
1466 BAD_ALLOCATION_TYPE = -1
1467 };
1468
1469 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1470 BAD_ALLOCATION_TYPE, // 0
1471 BAD_ALLOCATION_TYPE, // 1
1472 BAD_ALLOCATION_TYPE, // 2
1473 BAD_ALLOCATION_TYPE, // 3
1474 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1475 NONSTATIC_SHORT, // T_CHAR = 5,
1476 NONSTATIC_WORD, // T_FLOAT = 6,
1477 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1478 NONSTATIC_BYTE, // T_BYTE = 8,
1479 NONSTATIC_SHORT, // T_SHORT = 9,
1480 NONSTATIC_WORD, // T_INT = 10,
1481 NONSTATIC_DOUBLE, // T_LONG = 11,
1482 NONSTATIC_OOP, // T_OBJECT = 12,
1483 NONSTATIC_OOP, // T_ARRAY = 13,
1484 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1485 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1486 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1487 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1488 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1489 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1490 BAD_ALLOCATION_TYPE, // 0
1491 BAD_ALLOCATION_TYPE, // 1
1492 BAD_ALLOCATION_TYPE, // 2
1493 BAD_ALLOCATION_TYPE, // 3
1494 STATIC_BYTE , // T_BOOLEAN = 4,
1495 STATIC_SHORT, // T_CHAR = 5,
1496 STATIC_WORD, // T_FLOAT = 6,
1497 STATIC_DOUBLE, // T_DOUBLE = 7,
1498 STATIC_BYTE, // T_BYTE = 8,
1499 STATIC_SHORT, // T_SHORT = 9,
1500 STATIC_WORD, // T_INT = 10,
1501 STATIC_DOUBLE, // T_LONG = 11,
1502 STATIC_OOP, // T_OBJECT = 12,
1503 STATIC_OOP, // T_ARRAY = 13,
1504 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1505 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1506 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1507 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1508 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1509 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1510 };
1511
1512 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1513 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1514 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1515 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1516 return result;
1517 }
1518
1519 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1520 public:
1521 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1522
1523 FieldAllocationCount() {
1524 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1525 count[i] = 0;
1526 }
1527 }
1528
1529 FieldAllocationType update(bool is_static, BasicType type) {
1530 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1531 if (atype != BAD_ALLOCATION_TYPE) {
1532 // Make sure there is no overflow with injected fields.
1533 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1534 count[atype]++;
1535 }
1536 return atype;
1537 }
1538 };
1539
1540 // Side-effects: populates the _fields, _fields_annotations,
1541 // _fields_type_annotations fields
1542 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1543 bool is_interface,
1544 FieldAllocationCount* const fac,
1545 ConstantPool* cp,
1546 const int cp_size,
1547 u2* const java_fields_count_ptr,
1548 TRAPS) {
1549
1550 assert(cfs != NULL, "invariant");
1551 assert(fac != NULL, "invariant");
1552 assert(cp != NULL, "invariant");
1553 assert(java_fields_count_ptr != NULL, "invariant");
1554
1555 assert(NULL == _fields, "invariant");
1556 assert(NULL == _fields_annotations, "invariant");
1557 assert(NULL == _fields_type_annotations, "invariant");
1558
1559 cfs->guarantee_more(2, CHECK); // length
1560 const u2 length = cfs->get_u2_fast();
1561 *java_fields_count_ptr = length;
1562
1563 int num_injected = 0;
1564 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1565 &num_injected);
1566 const int total_fields = length + num_injected;
1567
1568 // The field array starts with tuples of shorts
1569 // [access, name index, sig index, initial value index, byte offset].
1570 // A generic signature slot only exists for field with generic
1571 // signature attribute. And the access flag is set with
1572 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1573 // signature slots are at the end of the field array and after all
1574 // other fields data.
1575 //
1576 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1577 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1578 // ...
1579 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1580 // [generic signature index]
1581 // [generic signature index]
1582 // ...
1583 //
1584 // Allocate a temporary resource array for field data. For each field,
1585 // a slot is reserved in the temporary array for the generic signature
1586 // index. After parsing all fields, the data are copied to a permanent
1587 // array and any unused slots will be discarded.
1588 ResourceMark rm(THREAD);
1589 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1590 u2,
1591 total_fields * (FieldInfo::field_slots + 1));
1592
1593 // The generic signature slots start after all other fields' data.
1594 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1595 int num_generic_signature = 0;
1596 for (int n = 0; n < length; n++) {
1597 // access_flags, name_index, descriptor_index, attributes_count
1598 cfs->guarantee_more(8, CHECK);
1599
1600 AccessFlags access_flags;
1601 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1602 verify_legal_field_modifiers(flags, is_interface, CHECK);
1603 access_flags.set_flags(flags);
1604
1605 const u2 name_index = cfs->get_u2_fast();
1606 check_property(valid_symbol_at(name_index),
1607 "Invalid constant pool index %u for field name in class file %s",
1608 name_index, CHECK);
1609 const Symbol* const name = cp->symbol_at(name_index);
1610 verify_legal_field_name(name, CHECK);
1611
1612 const u2 signature_index = cfs->get_u2_fast();
1613 check_property(valid_symbol_at(signature_index),
1614 "Invalid constant pool index %u for field signature in class file %s",
1615 signature_index, CHECK);
1616 const Symbol* const sig = cp->symbol_at(signature_index);
1617 verify_legal_field_signature(name, sig, CHECK);
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);
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);
1719 field->set_allocation_type(atype);
1720 index++;
1721 }
1722 }
1723
1724 assert(NULL == _fields, "invariant");
1725
1726 _fields =
1727 MetadataFactory::new_array<u2>(_loader_data,
1728 index * FieldInfo::field_slots + num_generic_signature,
1729 CHECK);
1730 // Sometimes injected fields already exist in the Java source so
1731 // the fields array could be too long. In that case the
1732 // fields array is trimed. Also unused slots that were reserved
1733 // for generic signature indexes are discarded.
1734 {
1735 int i = 0;
1736 for (; i < index * FieldInfo::field_slots; i++) {
1737 _fields->at_put(i, fa[i]);
1738 }
1739 for (int j = total_fields * FieldInfo::field_slots;
1740 j < generic_signature_slot; j++) {
1741 _fields->at_put(i++, fa[j]);
1742 }
1743 assert(_fields->length() == i, "");
1744 }
1745
1746 if (_need_verify && length > 1) {
1747 // Check duplicated fields
1748 ResourceMark rm(THREAD);
1749 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1750 THREAD, NameSigHash*, HASH_ROW_SIZE);
1751 initialize_hashtable(names_and_sigs);
1752 bool dup = false;
1753 const Symbol* name = NULL;
1754 const Symbol* sig = NULL;
1755 {
1756 debug_only(NoSafepointVerifier nsv;)
1757 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1758 name = fs.name();
1759 sig = fs.signature();
1760 // If no duplicates, add name/signature in hashtable names_and_sigs.
1761 if (!put_after_lookup(name, sig, names_and_sigs)) {
1762 dup = true;
1763 break;
1764 }
1765 }
1766 }
1767 if (dup) {
1768 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1769 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1770 }
1771 }
1772 }
1773
1774
1775 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1776 u4 code_length,
1777 u4 exception_table_length,
1778 TRAPS) {
1779 assert(cfs != NULL, "invariant");
1780
1781 const unsafe_u2* const exception_table_start = cfs->current();
1782 assert(exception_table_start != NULL, "null exception table");
1783
1784 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1785 // end_pc,
1786 // handler_pc,
1787 // catch_type_index
1788
1789 // Will check legal target after parsing code array in verifier.
1790 if (_need_verify) {
1791 for (unsigned int i = 0; i < exception_table_length; i++) {
1792 const u2 start_pc = cfs->get_u2_fast();
1793 const u2 end_pc = cfs->get_u2_fast();
1794 const u2 handler_pc = cfs->get_u2_fast();
1795 const u2 catch_type_index = cfs->get_u2_fast();
1796 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1797 "Illegal exception table range in class file %s",
1798 CHECK_NULL);
1799 guarantee_property(handler_pc < code_length,
1800 "Illegal exception table handler in class file %s",
1801 CHECK_NULL);
1802 if (catch_type_index != 0) {
1803 guarantee_property(valid_klass_reference_at(catch_type_index),
1804 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1805 }
1806 }
1807 } else {
1808 cfs->skip_u2_fast(exception_table_length * 4);
1809 }
1810 return exception_table_start;
1811 }
1812
1813 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1814 u4 code_length,
1815 CompressedLineNumberWriteStream**const write_stream,
1816 TRAPS) {
1817
1818 const ClassFileStream* const cfs = _stream;
1819 unsigned int num_entries = cfs->get_u2(CHECK);
1820
1821 // Each entry is a u2 start_pc, and a u2 line_number
1822 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1823
1824 // Verify line number attribute and table length
1825 check_property(
1826 code_attribute_length == sizeof(u2) + length_in_bytes,
1827 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1828
1829 cfs->guarantee_more(length_in_bytes, CHECK);
1830
1831 if ((*write_stream) == NULL) {
1832 if (length_in_bytes > fixed_buffer_size) {
1833 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1834 } else {
1835 (*write_stream) = new CompressedLineNumberWriteStream(
1836 _linenumbertable_buffer, fixed_buffer_size);
1837 }
1838 }
1839
1840 while (num_entries-- > 0) {
1841 const u2 bci = cfs->get_u2_fast(); // start_pc
1842 const u2 line = cfs->get_u2_fast(); // line_number
1843 guarantee_property(bci < code_length,
1844 "Invalid pc in LineNumberTable in class file %s", CHECK);
1845 (*write_stream)->write_pair(bci, line);
1846 }
1847 }
1848
1849
1850 class LVT_Hash : public AllStatic {
1851 public:
1852
1853 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1854 /*
1855 * 3-tuple start_bci/length/slot has to be unique key,
1856 * so the following comparison seems to be redundant:
1857 * && elem->name_cp_index == entry->_elem->name_cp_index
1858 */
1859 return (e0.start_bci == e1.start_bci &&
1860 e0.length == e1.length &&
1861 e0.name_cp_index == e1.name_cp_index &&
1862 e0.slot == e1.slot);
1863 }
1864
1865 static unsigned int hash(LocalVariableTableElement const& e0) {
1866 unsigned int raw_hash = e0.start_bci;
1867
1868 raw_hash = e0.length + raw_hash * 37;
1869 raw_hash = e0.name_cp_index + raw_hash * 37;
1870 raw_hash = e0.slot + raw_hash * 37;
1871
1872 return raw_hash;
1873 }
1874 };
1875
1876
1877 // Class file LocalVariableTable elements.
1878 class Classfile_LVT_Element {
1879 public:
1880 u2 start_bci;
1881 u2 length;
1882 u2 name_cp_index;
1883 u2 descriptor_cp_index;
1884 u2 slot;
1885 };
1886
1887 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1888 LocalVariableTableElement* const lvt) {
1889 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1890 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1891 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1892 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1893 lvt->signature_cp_index = 0;
1894 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1895 }
1896
1897 // Function is used to parse both attributes:
1898 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1899 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1900 u4 code_length,
1901 u2 max_locals,
1902 u4 code_attribute_length,
1903 u2* const localvariable_table_length,
1904 bool isLVTT,
1905 TRAPS) {
1906 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1907 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1908 const unsigned int size =
1909 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1910
1911 const ConstantPool* const cp = _cp;
1912
1913 // Verify local variable table attribute has right length
1914 if (_need_verify) {
1915 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1916 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1917 }
1918
1919 const unsafe_u2* const localvariable_table_start = cfs->current();
1920 assert(localvariable_table_start != NULL, "null local variable table");
1921 if (!_need_verify) {
1922 cfs->skip_u2_fast(size);
1923 } else {
1924 cfs->guarantee_more(size * 2, CHECK_NULL);
1925 for(int i = 0; i < (*localvariable_table_length); i++) {
1926 const u2 start_pc = cfs->get_u2_fast();
1927 const u2 length = cfs->get_u2_fast();
1928 const u2 name_index = cfs->get_u2_fast();
1929 const u2 descriptor_index = cfs->get_u2_fast();
1930 const u2 index = cfs->get_u2_fast();
1931 // Assign to a u4 to avoid overflow
1932 const u4 end_pc = (u4)start_pc + (u4)length;
1933
1934 if (start_pc >= code_length) {
1935 classfile_parse_error(
1936 "Invalid start_pc %u in %s in class file %s",
1937 start_pc, tbl_name, CHECK_NULL);
1938 }
1939 if (end_pc > code_length) {
1940 classfile_parse_error(
1941 "Invalid length %u in %s in class file %s",
1942 length, tbl_name, CHECK_NULL);
1943 }
1944 const int cp_size = cp->length();
1945 guarantee_property(valid_symbol_at(name_index),
1946 "Name index %u in %s has bad constant type in class file %s",
1947 name_index, tbl_name, CHECK_NULL);
1948 guarantee_property(valid_symbol_at(descriptor_index),
1949 "Signature index %u in %s has bad constant type in class file %s",
1950 descriptor_index, tbl_name, CHECK_NULL);
1951
1952 const Symbol* const name = cp->symbol_at(name_index);
1953 const Symbol* const sig = cp->symbol_at(descriptor_index);
1954 verify_legal_field_name(name, CHECK_NULL);
1955 u2 extra_slot = 0;
1956 if (!isLVTT) {
1957 verify_legal_field_signature(name, sig, CHECK_NULL);
1958
1959 // 4894874: check special cases for double and long local variables
1960 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1961 sig == vmSymbols::type_signature(T_LONG)) {
1962 extra_slot = 1;
1963 }
1964 }
1965 guarantee_property((index + extra_slot) < max_locals,
1966 "Invalid index %u in %s in class file %s",
1967 index, tbl_name, CHECK_NULL);
1968 }
1969 }
1970 return localvariable_table_start;
1971 }
1972
1973
1974 void ClassFileParser::parse_type_array(u2 array_length,
1975 u4 code_length,
1976 u4* const u1_index,
1977 u4* const u2_index,
1978 u1* const u1_array,
1979 u2* const u2_array,
1980 TRAPS) {
1981 const ClassFileStream* const cfs = _stream;
1982 u2 index = 0; // index in the array with long/double occupying two slots
1983 u4 i1 = *u1_index;
1984 u4 i2 = *u2_index + 1;
1985 for(int i = 0; i < array_length; i++) {
1986 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1987 index++;
1988 if (tag == ITEM_Long || tag == ITEM_Double) {
1989 index++;
1990 } else if (tag == ITEM_Object) {
1991 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1992 guarantee_property(valid_klass_reference_at(class_index),
1993 "Bad class index %u in StackMap in class file %s",
1994 class_index, CHECK);
1995 } else if (tag == ITEM_Uninitialized) {
1996 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1997 guarantee_property(
1998 offset < code_length,
1999 "Bad uninitialized type offset %u in StackMap in class file %s",
2000 offset, CHECK);
2001 } else {
2002 guarantee_property(
2003 tag <= (u1)ITEM_Uninitialized,
2004 "Unknown variable type %u in StackMap in class file %s",
2005 tag, CHECK);
2006 }
2007 }
2008 u2_array[*u2_index] = index;
2009 *u1_index = i1;
2010 *u2_index = i2;
2011 }
2012
2013 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2014 u4 code_attribute_length,
2015 bool need_verify,
2016 TRAPS) {
2017 assert(cfs != NULL, "invariant");
2018
2019 if (0 == code_attribute_length) {
2020 return NULL;
2021 }
2022
2023 const u1* const stackmap_table_start = cfs->current();
2024 assert(stackmap_table_start != NULL, "null stackmap table");
2025
2026 // check code_attribute_length first
2027 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2028
2029 if (!need_verify && !DumpSharedSpaces) {
2030 return NULL;
2031 }
2032 return stackmap_table_start;
2033 }
2034
2035 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2036 u2* const checked_exceptions_length,
2037 u4 method_attribute_length,
2038 TRAPS) {
2039 assert(cfs != NULL, "invariant");
2040 assert(checked_exceptions_length != NULL, "invariant");
2041
2042 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2043 *checked_exceptions_length = cfs->get_u2_fast();
2044 const unsigned int size =
2045 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2046 const unsafe_u2* const checked_exceptions_start = cfs->current();
2047 assert(checked_exceptions_start != NULL, "null checked exceptions");
2048 if (!_need_verify) {
2049 cfs->skip_u2_fast(size);
2050 } else {
2051 // Verify each value in the checked exception table
2052 u2 checked_exception;
2053 const u2 len = *checked_exceptions_length;
2054 cfs->guarantee_more(2 * len, CHECK_NULL);
2055 for (int i = 0; i < len; i++) {
2056 checked_exception = cfs->get_u2_fast();
2057 check_property(
2058 valid_klass_reference_at(checked_exception),
2059 "Exception name has bad type at constant pool %u in class file %s",
2060 checked_exception, CHECK_NULL);
2061 }
2062 }
2063 // check exceptions attribute length
2064 if (_need_verify) {
2065 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2066 sizeof(u2) * size),
2067 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2068 }
2069 return checked_exceptions_start;
2070 }
2071
2072 void ClassFileParser::throwIllegalSignature(const char* type,
2073 const Symbol* name,
2074 const Symbol* sig,
2075 TRAPS) const {
2076 assert(name != NULL, "invariant");
2077 assert(sig != NULL, "invariant");
2078
2079 ResourceMark rm(THREAD);
2080 Exceptions::fthrow(THREAD_AND_LOCATION,
2081 vmSymbols::java_lang_ClassFormatError(),
2082 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2083 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2084 }
2085
2086 AnnotationCollector::ID
2087 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2088 const Symbol* name) {
2089 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2090 // Privileged code can use all annotations. Other code silently drops some.
2091 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2092 loader_data->is_platform_class_loader_data() ||
2093 loader_data->is_anonymous();
2094 switch (sid) {
2095 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2096 if (_location != _in_method) break; // only allow for methods
2097 if (!privileged) break; // only allow in privileged code
2098 return _method_CallerSensitive;
2099 }
2100 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2101 if (_location != _in_method) break; // only allow for methods
2102 if (!privileged) break; // only allow in privileged code
2103 return _method_ForceInline;
2104 }
2105 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2106 if (_location != _in_method) break; // only allow for methods
2107 if (!privileged) break; // only allow in privileged code
2108 return _method_DontInline;
2109 }
2110 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2111 if (_location != _in_method) break; // only allow for methods
2112 if (!privileged) break; // only allow in privileged code
2113 return _method_InjectedProfile;
2114 }
2115 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2116 if (_location != _in_method) break; // only allow for methods
2117 if (!privileged) break; // only allow in privileged code
2118 return _method_LambdaForm_Compiled;
2119 }
2120 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2121 if (_location != _in_method) break; // only allow for methods
2122 if (!privileged) break; // only allow in privileged code
2123 return _method_LambdaForm_Hidden;
2124 }
2125 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2126 if (_location != _in_method) break; // only allow for methods
2127 if (!privileged) break; // only allow in privileged code
2128 return _method_HotSpotIntrinsicCandidate;
2129 }
2130 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2131 if (_location != _in_field) break; // only allow for fields
2132 if (!privileged) break; // only allow in privileged code
2133 return _field_Stable;
2134 }
2135 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2136 if (_location != _in_field && _location != _in_class) {
2137 break; // only allow for fields and classes
2138 }
2139 if (!EnableContended || (RestrictContended && !privileged)) {
2140 break; // honor privileges
2141 }
2142 return _jdk_internal_vm_annotation_Contended;
2143 }
2144 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2145 if (_location != _in_method) break; // only allow for methods
2146 if (RestrictReservedStack && !privileged) break; // honor privileges
2147 return _jdk_internal_vm_annotation_ReservedStackAccess;
2148 }
2149 default: {
2150 break;
2151 }
2152 }
2153 return AnnotationCollector::_unknown;
2154 }
2155
2156 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2157 if (is_contended())
2158 f->set_contended_group(contended_group());
2159 if (is_stable())
2160 f->set_stable(true);
2161 }
2162
2163 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2164 // If there's an error deallocate metadata for field annotations
2165 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2166 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2167 }
2168
2169 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2170 if (has_annotation(_method_CallerSensitive))
2171 m->set_caller_sensitive(true);
2172 if (has_annotation(_method_ForceInline))
2173 m->set_force_inline(true);
2174 if (has_annotation(_method_DontInline))
2175 m->set_dont_inline(true);
2176 if (has_annotation(_method_InjectedProfile))
2177 m->set_has_injected_profile(true);
2178 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2179 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2180 if (has_annotation(_method_LambdaForm_Hidden))
2181 m->set_hidden(true);
2182 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2183 m->set_intrinsic_candidate(true);
2184 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2185 m->set_has_reserved_stack_access(true);
2186 }
2187
2188 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2189 assert(ik != NULL, "invariant");
2190 ik->set_is_contended(is_contended());
2191 }
2192
2193 #define MAX_ARGS_SIZE 255
2194 #define MAX_CODE_SIZE 65535
2195 #define INITIAL_MAX_LVT_NUMBER 256
2196
2197 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2198 *
2199 * Rules for LVT's and LVTT's are:
2200 * - There can be any number of LVT's and LVTT's.
2201 * - If there are n LVT's, it is the same as if there was just
2202 * one LVT containing all the entries from the n LVT's.
2203 * - There may be no more than one LVT entry per local variable.
2204 * Two LVT entries are 'equal' if these fields are the same:
2205 * start_pc, length, name, slot
2206 * - There may be no more than one LVTT entry per each LVT entry.
2207 * Each LVTT entry has to match some LVT entry.
2208 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2209 */
2210 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2211 int lvt_cnt,
2212 u2* const localvariable_table_length,
2213 const unsafe_u2** const localvariable_table_start,
2214 int lvtt_cnt,
2215 u2* const localvariable_type_table_length,
2216 const unsafe_u2** const localvariable_type_table_start,
2217 TRAPS) {
2218
2219 ResourceMark rm(THREAD);
2220
2221 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2222 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2223
2224 LVT_HashTable* const table = new LVT_HashTable();
2225
2226 // To fill LocalVariableTable in
2227 const Classfile_LVT_Element* cf_lvt;
2228 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2229
2230 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2231 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2232 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2233 copy_lvt_element(&cf_lvt[idx], lvt);
2234 // If no duplicates, add LVT elem in hashtable.
2235 if (table->put(*lvt, lvt) == false
2236 && _need_verify
2237 && _major_version >= JAVA_1_5_VERSION) {
2238 classfile_parse_error("Duplicated LocalVariableTable attribute "
2239 "entry for '%s' in class file %s",
2240 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2241 CHECK);
2242 }
2243 }
2244 }
2245
2246 // To merge LocalVariableTable and LocalVariableTypeTable
2247 const Classfile_LVT_Element* cf_lvtt;
2248 LocalVariableTableElement lvtt_elem;
2249
2250 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2251 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2252 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2253 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2254 LocalVariableTableElement** entry = table->get(lvtt_elem);
2255 if (entry == NULL) {
2256 if (_need_verify) {
2257 classfile_parse_error("LVTT entry for '%s' in class file %s "
2258 "does not match any LVT entry",
2259 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2260 CHECK);
2261 }
2262 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2263 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2264 "entry for '%s' in class file %s",
2265 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2266 CHECK);
2267 } else {
2268 // to add generic signatures into LocalVariableTable
2269 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2270 }
2271 }
2272 }
2273 }
2274
2275
2276 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2277 const u1* runtime_visible_annotations,
2278 int runtime_visible_annotations_length,
2279 const u1* runtime_invisible_annotations,
2280 int runtime_invisible_annotations_length,
2281 const u1* runtime_visible_parameter_annotations,
2282 int runtime_visible_parameter_annotations_length,
2283 const u1* runtime_invisible_parameter_annotations,
2284 int runtime_invisible_parameter_annotations_length,
2285 const u1* runtime_visible_type_annotations,
2286 int runtime_visible_type_annotations_length,
2287 const u1* runtime_invisible_type_annotations,
2288 int runtime_invisible_type_annotations_length,
2289 const u1* annotation_default,
2290 int annotation_default_length,
2291 TRAPS) {
2292
2293 AnnotationArray* a;
2294
2295 if (runtime_visible_annotations_length +
2296 runtime_invisible_annotations_length > 0) {
2297 a = assemble_annotations(runtime_visible_annotations,
2298 runtime_visible_annotations_length,
2299 runtime_invisible_annotations,
2300 runtime_invisible_annotations_length,
2301 CHECK);
2302 cm->set_method_annotations(a);
2303 }
2304
2305 if (runtime_visible_parameter_annotations_length +
2306 runtime_invisible_parameter_annotations_length > 0) {
2307 a = assemble_annotations(runtime_visible_parameter_annotations,
2308 runtime_visible_parameter_annotations_length,
2309 runtime_invisible_parameter_annotations,
2310 runtime_invisible_parameter_annotations_length,
2311 CHECK);
2312 cm->set_parameter_annotations(a);
2313 }
2314
2315 if (annotation_default_length > 0) {
2316 a = assemble_annotations(annotation_default,
2317 annotation_default_length,
2318 NULL,
2319 0,
2320 CHECK);
2321 cm->set_default_annotations(a);
2322 }
2323
2324 if (runtime_visible_type_annotations_length +
2325 runtime_invisible_type_annotations_length > 0) {
2326 a = assemble_annotations(runtime_visible_type_annotations,
2327 runtime_visible_type_annotations_length,
2328 runtime_invisible_type_annotations,
2329 runtime_invisible_type_annotations_length,
2330 CHECK);
2331 cm->set_type_annotations(a);
2332 }
2333 }
2334
2335
2336 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2337 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2338 // Method* to save footprint, so we only know the size of the resulting Method* when the
2339 // entire method attribute is parsed.
2340 //
2341 // The promoted_flags parameter is used to pass relevant access_flags
2342 // from the method back up to the containing klass. These flag values
2343 // are added to klass's access_flags.
2344
2345 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2346 bool is_interface,
2347 const ConstantPool* cp,
2348 AccessFlags* const promoted_flags,
2349 TRAPS) {
2350 assert(cfs != NULL, "invariant");
2351 assert(cp != NULL, "invariant");
2352 assert(promoted_flags != NULL, "invariant");
2353
2354 ResourceMark rm(THREAD);
2355 // Parse fixed parts:
2356 // access_flags, name_index, descriptor_index, attributes_count
2357 cfs->guarantee_more(8, CHECK_NULL);
2358
2359 int flags = cfs->get_u2_fast();
2360 const u2 name_index = cfs->get_u2_fast();
2361 const int cp_size = cp->length();
2362 check_property(
2363 valid_symbol_at(name_index),
2364 "Illegal constant pool index %u for method name in class file %s",
2365 name_index, CHECK_NULL);
2366 const Symbol* const name = cp->symbol_at(name_index);
2367 verify_legal_method_name(name, CHECK_NULL);
2368
2369 const u2 signature_index = cfs->get_u2_fast();
2370 guarantee_property(
2371 valid_symbol_at(signature_index),
2372 "Illegal constant pool index %u for method signature in class file %s",
2373 signature_index, CHECK_NULL);
2374 const Symbol* const signature = cp->symbol_at(signature_index);
2375
2376 if (name == vmSymbols::class_initializer_name()) {
2377 // We ignore the other access flags for a valid class initializer.
2378 // (JVM Spec 2nd ed., chapter 4.6)
2379 if (_major_version < 51) { // backward compatibility
2380 flags = JVM_ACC_STATIC;
2381 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2382 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2383 } else {
2384 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2385 }
2386 } else {
2387 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2388 }
2389
2390 if (name == vmSymbols::object_initializer_name() && is_interface) {
2391 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2392 }
2393
2394 int args_size = -1; // only used when _need_verify is true
2395 if (_need_verify) {
2396 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2397 verify_legal_method_signature(name, signature, CHECK_NULL);
2398 if (args_size > MAX_ARGS_SIZE) {
2399 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2400 }
2401 }
2402
2403 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2404
2405 // Default values for code and exceptions attribute elements
2406 u2 max_stack = 0;
2407 u2 max_locals = 0;
2408 u4 code_length = 0;
2409 const u1* code_start = 0;
2410 u2 exception_table_length = 0;
2411 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2412 Array<int>* exception_handlers = Universe::the_empty_int_array();
2413 u2 checked_exceptions_length = 0;
2414 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2415 CompressedLineNumberWriteStream* linenumber_table = NULL;
2416 int linenumber_table_length = 0;
2417 int total_lvt_length = 0;
2418 u2 lvt_cnt = 0;
2419 u2 lvtt_cnt = 0;
2420 bool lvt_allocated = false;
2421 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2422 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2423 u2* localvariable_table_length = NULL;
2424 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2425 u2* localvariable_type_table_length = NULL;
2426 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2427 int method_parameters_length = -1;
2428 const u1* method_parameters_data = NULL;
2429 bool method_parameters_seen = false;
2430 bool parsed_code_attribute = false;
2431 bool parsed_checked_exceptions_attribute = false;
2432 bool parsed_stackmap_attribute = false;
2433 // stackmap attribute - JDK1.5
2434 const u1* stackmap_data = NULL;
2435 int stackmap_data_length = 0;
2436 u2 generic_signature_index = 0;
2437 MethodAnnotationCollector parsed_annotations;
2438 const u1* runtime_visible_annotations = NULL;
2439 int runtime_visible_annotations_length = 0;
2440 const u1* runtime_invisible_annotations = NULL;
2441 int runtime_invisible_annotations_length = 0;
2442 const u1* runtime_visible_parameter_annotations = NULL;
2443 int runtime_visible_parameter_annotations_length = 0;
2444 const u1* runtime_invisible_parameter_annotations = NULL;
2445 int runtime_invisible_parameter_annotations_length = 0;
2446 const u1* runtime_visible_type_annotations = NULL;
2447 int runtime_visible_type_annotations_length = 0;
2448 const u1* runtime_invisible_type_annotations = NULL;
2449 int runtime_invisible_type_annotations_length = 0;
2450 bool runtime_invisible_annotations_exists = false;
2451 bool runtime_invisible_type_annotations_exists = false;
2452 bool runtime_invisible_parameter_annotations_exists = false;
2453 const u1* annotation_default = NULL;
2454 int annotation_default_length = 0;
2455
2456 // Parse code and exceptions attribute
2457 u2 method_attributes_count = cfs->get_u2_fast();
2458 while (method_attributes_count--) {
2459 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2460 const u2 method_attribute_name_index = cfs->get_u2_fast();
2461 const u4 method_attribute_length = cfs->get_u4_fast();
2462 check_property(
2463 valid_symbol_at(method_attribute_name_index),
2464 "Invalid method attribute name index %u in class file %s",
2465 method_attribute_name_index, CHECK_NULL);
2466
2467 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2468 if (method_attribute_name == vmSymbols::tag_code()) {
2469 // Parse Code attribute
2470 if (_need_verify) {
2471 guarantee_property(
2472 !access_flags.is_native() && !access_flags.is_abstract(),
2473 "Code attribute in native or abstract methods in class file %s",
2474 CHECK_NULL);
2475 }
2476 if (parsed_code_attribute) {
2477 classfile_parse_error("Multiple Code attributes in class file %s",
2478 CHECK_NULL);
2479 }
2480 parsed_code_attribute = true;
2481
2482 // Stack size, locals size, and code size
2483 if (_major_version == 45 && _minor_version <= 2) {
2484 cfs->guarantee_more(4, CHECK_NULL);
2485 max_stack = cfs->get_u1_fast();
2486 max_locals = cfs->get_u1_fast();
2487 code_length = cfs->get_u2_fast();
2488 } else {
2489 cfs->guarantee_more(8, CHECK_NULL);
2490 max_stack = cfs->get_u2_fast();
2491 max_locals = cfs->get_u2_fast();
2492 code_length = cfs->get_u4_fast();
2493 }
2494 if (_need_verify) {
2495 guarantee_property(args_size <= max_locals,
2496 "Arguments can't fit into locals in class file %s",
2497 CHECK_NULL);
2498 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2499 "Invalid method Code length %u in class file %s",
2500 code_length, CHECK_NULL);
2501 }
2502 // Code pointer
2503 code_start = cfs->current();
2504 assert(code_start != NULL, "null code start");
2505 cfs->guarantee_more(code_length, CHECK_NULL);
2506 cfs->skip_u1_fast(code_length);
2507
2508 // Exception handler table
2509 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2510 exception_table_length = cfs->get_u2_fast();
2511 if (exception_table_length > 0) {
2512 exception_table_start = parse_exception_table(cfs,
2513 code_length,
2514 exception_table_length,
2515 CHECK_NULL);
2516 }
2517
2518 // Parse additional attributes in code attribute
2519 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2520 u2 code_attributes_count = cfs->get_u2_fast();
2521
2522 unsigned int calculated_attribute_length = 0;
2523
2524 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2525 calculated_attribute_length =
2526 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2527 } else {
2528 // max_stack, locals and length are smaller in pre-version 45.2 classes
2529 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2530 }
2531 calculated_attribute_length +=
2532 code_length +
2533 sizeof(exception_table_length) +
2534 sizeof(code_attributes_count) +
2535 exception_table_length *
2536 ( sizeof(u2) + // start_pc
2537 sizeof(u2) + // end_pc
2538 sizeof(u2) + // handler_pc
2539 sizeof(u2) ); // catch_type_index
2540
2541 while (code_attributes_count--) {
2542 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2543 const u2 code_attribute_name_index = cfs->get_u2_fast();
2544 const u4 code_attribute_length = cfs->get_u4_fast();
2545 calculated_attribute_length += code_attribute_length +
2546 sizeof(code_attribute_name_index) +
2547 sizeof(code_attribute_length);
2548 check_property(valid_symbol_at(code_attribute_name_index),
2549 "Invalid code attribute name index %u in class file %s",
2550 code_attribute_name_index,
2551 CHECK_NULL);
2552 if (LoadLineNumberTables &&
2553 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2554 // Parse and compress line number table
2555 parse_linenumber_table(code_attribute_length,
2556 code_length,
2557 &linenumber_table,
2558 CHECK_NULL);
2559
2560 } else if (LoadLocalVariableTables &&
2561 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2562 // Parse local variable table
2563 if (!lvt_allocated) {
2564 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2565 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2566 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2567 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2568 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2569 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2570 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2571 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2572 lvt_allocated = true;
2573 }
2574 if (lvt_cnt == max_lvt_cnt) {
2575 max_lvt_cnt <<= 1;
2576 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2577 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2578 }
2579 localvariable_table_start[lvt_cnt] =
2580 parse_localvariable_table(cfs,
2581 code_length,
2582 max_locals,
2583 code_attribute_length,
2584 &localvariable_table_length[lvt_cnt],
2585 false, // is not LVTT
2586 CHECK_NULL);
2587 total_lvt_length += localvariable_table_length[lvt_cnt];
2588 lvt_cnt++;
2589 } else if (LoadLocalVariableTypeTables &&
2590 _major_version >= JAVA_1_5_VERSION &&
2591 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2592 if (!lvt_allocated) {
2593 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2594 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2595 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2596 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2597 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2598 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2599 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2600 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2601 lvt_allocated = true;
2602 }
2603 // Parse local variable type table
2604 if (lvtt_cnt == max_lvtt_cnt) {
2605 max_lvtt_cnt <<= 1;
2606 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2607 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2608 }
2609 localvariable_type_table_start[lvtt_cnt] =
2610 parse_localvariable_table(cfs,
2611 code_length,
2612 max_locals,
2613 code_attribute_length,
2614 &localvariable_type_table_length[lvtt_cnt],
2615 true, // is LVTT
2616 CHECK_NULL);
2617 lvtt_cnt++;
2618 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2619 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2620 // Stack map is only needed by the new verifier in JDK1.5.
2621 if (parsed_stackmap_attribute) {
2622 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2623 }
2624 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2625 stackmap_data_length = code_attribute_length;
2626 parsed_stackmap_attribute = true;
2627 } else {
2628 // Skip unknown attributes
2629 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2630 }
2631 }
2632 // check method attribute length
2633 if (_need_verify) {
2634 guarantee_property(method_attribute_length == calculated_attribute_length,
2635 "Code segment has wrong length in class file %s",
2636 CHECK_NULL);
2637 }
2638 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2639 // Parse Exceptions attribute
2640 if (parsed_checked_exceptions_attribute) {
2641 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2642 CHECK_NULL);
2643 }
2644 parsed_checked_exceptions_attribute = true;
2645 checked_exceptions_start =
2646 parse_checked_exceptions(cfs,
2647 &checked_exceptions_length,
2648 method_attribute_length,
2649 CHECK_NULL);
2650 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2651 // reject multiple method parameters
2652 if (method_parameters_seen) {
2653 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2654 CHECK_NULL);
2655 }
2656 method_parameters_seen = true;
2657 method_parameters_length = cfs->get_u1_fast();
2658 const u2 real_length = (method_parameters_length * 4u) + 1u;
2659 if (method_attribute_length != real_length) {
2660 classfile_parse_error(
2661 "Invalid MethodParameters method attribute length %u in class file",
2662 method_attribute_length, CHECK_NULL);
2663 }
2664 method_parameters_data = cfs->current();
2665 cfs->skip_u2_fast(method_parameters_length);
2666 cfs->skip_u2_fast(method_parameters_length);
2667 // ignore this attribute if it cannot be reflected
2668 if (!SystemDictionary::Parameter_klass_loaded())
2669 method_parameters_length = -1;
2670 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2671 if (method_attribute_length != 0) {
2672 classfile_parse_error(
2673 "Invalid Synthetic method attribute length %u in class file %s",
2674 method_attribute_length, CHECK_NULL);
2675 }
2676 // Should we check that there hasn't already been a synthetic attribute?
2677 access_flags.set_is_synthetic();
2678 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2679 if (method_attribute_length != 0) {
2680 classfile_parse_error(
2681 "Invalid Deprecated method attribute length %u in class file %s",
2682 method_attribute_length, CHECK_NULL);
2683 }
2684 } else if (_major_version >= JAVA_1_5_VERSION) {
2685 if (method_attribute_name == vmSymbols::tag_signature()) {
2686 if (generic_signature_index != 0) {
2687 classfile_parse_error(
2688 "Multiple Signature attributes for method in class file %s",
2689 CHECK_NULL);
2690 }
2691 if (method_attribute_length != 2) {
2692 classfile_parse_error(
2693 "Invalid Signature attribute length %u in class file %s",
2694 method_attribute_length, CHECK_NULL);
2695 }
2696 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2697 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2698 if (runtime_visible_annotations != NULL) {
2699 classfile_parse_error(
2700 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2701 CHECK_NULL);
2702 }
2703 runtime_visible_annotations_length = method_attribute_length;
2704 runtime_visible_annotations = cfs->current();
2705 assert(runtime_visible_annotations != NULL, "null visible annotations");
2706 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2707 parse_annotations(cp,
2708 runtime_visible_annotations,
2709 runtime_visible_annotations_length,
2710 &parsed_annotations,
2711 _loader_data,
2712 CHECK_NULL);
2713 cfs->skip_u1_fast(runtime_visible_annotations_length);
2714 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2715 if (runtime_invisible_annotations_exists) {
2716 classfile_parse_error(
2717 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2718 CHECK_NULL);
2719 }
2720 runtime_invisible_annotations_exists = true;
2721 if (PreserveAllAnnotations) {
2722 runtime_invisible_annotations_length = method_attribute_length;
2723 runtime_invisible_annotations = cfs->current();
2724 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2725 }
2726 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2727 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2728 if (runtime_visible_parameter_annotations != NULL) {
2729 classfile_parse_error(
2730 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2731 CHECK_NULL);
2732 }
2733 runtime_visible_parameter_annotations_length = method_attribute_length;
2734 runtime_visible_parameter_annotations = cfs->current();
2735 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2736 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2737 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2738 if (runtime_invisible_parameter_annotations_exists) {
2739 classfile_parse_error(
2740 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2741 CHECK_NULL);
2742 }
2743 runtime_invisible_parameter_annotations_exists = true;
2744 if (PreserveAllAnnotations) {
2745 runtime_invisible_parameter_annotations_length = method_attribute_length;
2746 runtime_invisible_parameter_annotations = cfs->current();
2747 assert(runtime_invisible_parameter_annotations != NULL,
2748 "null invisible parameter annotations");
2749 }
2750 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2751 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2752 if (annotation_default != NULL) {
2753 classfile_parse_error(
2754 "Multiple AnnotationDefault attributes for method in class file %s",
2755 CHECK_NULL);
2756 }
2757 annotation_default_length = method_attribute_length;
2758 annotation_default = cfs->current();
2759 assert(annotation_default != NULL, "null annotation default");
2760 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2761 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2762 if (runtime_visible_type_annotations != NULL) {
2763 classfile_parse_error(
2764 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2765 CHECK_NULL);
2766 }
2767 runtime_visible_type_annotations_length = method_attribute_length;
2768 runtime_visible_type_annotations = cfs->current();
2769 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2770 // No need for the VM to parse Type annotations
2771 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2772 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2773 if (runtime_invisible_type_annotations_exists) {
2774 classfile_parse_error(
2775 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2776 CHECK_NULL);
2777 } else {
2778 runtime_invisible_type_annotations_exists = true;
2779 }
2780 if (PreserveAllAnnotations) {
2781 runtime_invisible_type_annotations_length = method_attribute_length;
2782 runtime_invisible_type_annotations = cfs->current();
2783 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2784 }
2785 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2786 } else {
2787 // Skip unknown attributes
2788 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2789 }
2790 } else {
2791 // Skip unknown attributes
2792 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2793 }
2794 }
2795
2796 if (linenumber_table != NULL) {
2797 linenumber_table->write_terminator();
2798 linenumber_table_length = linenumber_table->position();
2799 }
2800
2801 // Make sure there's at least one Code attribute in non-native/non-abstract method
2802 if (_need_verify) {
2803 guarantee_property(access_flags.is_native() ||
2804 access_flags.is_abstract() ||
2805 parsed_code_attribute,
2806 "Absent Code attribute in method that is not native or abstract in class file %s",
2807 CHECK_NULL);
2808 }
2809
2810 // All sizing information for a Method* is finally available, now create it
2811 InlineTableSizes sizes(
2812 total_lvt_length,
2813 linenumber_table_length,
2814 exception_table_length,
2815 checked_exceptions_length,
2816 method_parameters_length,
2817 generic_signature_index,
2818 runtime_visible_annotations_length +
2819 runtime_invisible_annotations_length,
2820 runtime_visible_parameter_annotations_length +
2821 runtime_invisible_parameter_annotations_length,
2822 runtime_visible_type_annotations_length +
2823 runtime_invisible_type_annotations_length,
2824 annotation_default_length,
2825 0);
2826
2827 Method* const m = Method::allocate(_loader_data,
2828 code_length,
2829 access_flags,
2830 &sizes,
2831 ConstMethod::NORMAL,
2832 CHECK_NULL);
2833
2834 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2835
2836 // Fill in information from fixed part (access_flags already set)
2837 m->set_constants(_cp);
2838 m->set_name_index(name_index);
2839 m->set_signature_index(signature_index);
2840
2841 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2842 m->constMethod()->set_result_type(rtf.type());
2843
2844 if (args_size >= 0) {
2845 m->set_size_of_parameters(args_size);
2846 } else {
2847 m->compute_size_of_parameters(THREAD);
2848 }
2849 #ifdef ASSERT
2850 if (args_size >= 0) {
2851 m->compute_size_of_parameters(THREAD);
2852 assert(args_size == m->size_of_parameters(), "");
2853 }
2854 #endif
2855
2856 // Fill in code attribute information
2857 m->set_max_stack(max_stack);
2858 m->set_max_locals(max_locals);
2859 if (stackmap_data != NULL) {
2860 m->constMethod()->copy_stackmap_data(_loader_data,
2861 (u1*)stackmap_data,
2862 stackmap_data_length,
2863 CHECK_NULL);
2864 }
2865
2866 // Copy byte codes
2867 m->set_code((u1*)code_start);
2868
2869 // Copy line number table
2870 if (linenumber_table != NULL) {
2871 memcpy(m->compressed_linenumber_table(),
2872 linenumber_table->buffer(),
2873 linenumber_table_length);
2874 }
2875
2876 // Copy exception table
2877 if (exception_table_length > 0) {
2878 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2879 m->exception_table_start(),
2880 exception_table_length * sizeof(ExceptionTableElement),
2881 sizeof(u2));
2882 }
2883
2884 // Copy method parameters
2885 if (method_parameters_length > 0) {
2886 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2887 for (int i = 0; i < method_parameters_length; i++) {
2888 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2889 method_parameters_data += 2;
2890 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2891 method_parameters_data += 2;
2892 }
2893 }
2894
2895 // Copy checked exceptions
2896 if (checked_exceptions_length > 0) {
2897 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2898 m->checked_exceptions_start(),
2899 checked_exceptions_length * sizeof(CheckedExceptionElement),
2900 sizeof(u2));
2901 }
2902
2903 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2904 if (total_lvt_length > 0) {
2905 promoted_flags->set_has_localvariable_table();
2906 copy_localvariable_table(m->constMethod(),
2907 lvt_cnt,
2908 localvariable_table_length,
2909 localvariable_table_start,
2910 lvtt_cnt,
2911 localvariable_type_table_length,
2912 localvariable_type_table_start,
2913 CHECK_NULL);
2914 }
2915
2916 if (parsed_annotations.has_any_annotations())
2917 parsed_annotations.apply_to(m);
2918
2919 // Copy annotations
2920 copy_method_annotations(m->constMethod(),
2921 runtime_visible_annotations,
2922 runtime_visible_annotations_length,
2923 runtime_invisible_annotations,
2924 runtime_invisible_annotations_length,
2925 runtime_visible_parameter_annotations,
2926 runtime_visible_parameter_annotations_length,
2927 runtime_invisible_parameter_annotations,
2928 runtime_invisible_parameter_annotations_length,
2929 runtime_visible_type_annotations,
2930 runtime_visible_type_annotations_length,
2931 runtime_invisible_type_annotations,
2932 runtime_invisible_type_annotations_length,
2933 annotation_default,
2934 annotation_default_length,
2935 CHECK_NULL);
2936
2937 if (name == vmSymbols::finalize_method_name() &&
2938 signature == vmSymbols::void_method_signature()) {
2939 if (m->is_empty_method()) {
2940 _has_empty_finalizer = true;
2941 } else {
2942 _has_finalizer = true;
2943 }
2944 }
2945 if (name == vmSymbols::object_initializer_name() &&
2946 signature == vmSymbols::void_method_signature() &&
2947 m->is_vanilla_constructor()) {
2948 _has_vanilla_constructor = true;
2949 }
2950
2951 NOT_PRODUCT(m->verify());
2952 return m;
2953 }
2954
2955
2956 // The promoted_flags parameter is used to pass relevant access_flags
2957 // from the methods back up to the containing klass. These flag values
2958 // are added to klass's access_flags.
2959 // Side-effects: populates the _methods field in the parser
2960 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2961 bool is_interface,
2962 AccessFlags* promoted_flags,
2963 bool* has_final_method,
2964 bool* declares_nonstatic_concrete_methods,
2965 TRAPS) {
2966 assert(cfs != NULL, "invariant");
2967 assert(promoted_flags != NULL, "invariant");
2968 assert(has_final_method != NULL, "invariant");
2969 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2970
2971 assert(NULL == _methods, "invariant");
2972
2973 cfs->guarantee_more(2, CHECK); // length
2974 const u2 length = cfs->get_u2_fast();
2975 if (length == 0) {
2976 _methods = Universe::the_empty_method_array();
2977 } else {
2978 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2979 length,
2980 NULL,
2981 CHECK);
2982
2983 for (int index = 0; index < length; index++) {
2984 Method* method = parse_method(cfs,
2985 is_interface,
2986 _cp,
2987 promoted_flags,
2988 CHECK);
2989
2990 if (method->is_final()) {
2991 *has_final_method = true;
2992 }
2993 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2994 // used for interface initialization, and default method inheritance analysis
2995 if (is_interface && !(*declares_nonstatic_concrete_methods)
2996 && !method->is_abstract() && !method->is_static()) {
2997 *declares_nonstatic_concrete_methods = true;
2998 }
2999 _methods->at_put(index, method);
3000 }
3001
3002 if (_need_verify && length > 1) {
3003 // Check duplicated methods
3004 ResourceMark rm(THREAD);
3005 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3006 THREAD, NameSigHash*, HASH_ROW_SIZE);
3007 initialize_hashtable(names_and_sigs);
3008 bool dup = false;
3009 const Symbol* name = NULL;
3010 const Symbol* sig = NULL;
3011 {
3012 debug_only(NoSafepointVerifier nsv;)
3013 for (int i = 0; i < length; i++) {
3014 const Method* const m = _methods->at(i);
3015 name = m->name();
3016 sig = m->signature();
3017 // If no duplicates, add name/signature in hashtable names_and_sigs.
3018 if (!put_after_lookup(name, sig, names_and_sigs)) {
3019 dup = true;
3020 break;
3021 }
3022 }
3023 }
3024 if (dup) {
3025 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3026 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3027 }
3028 }
3029 }
3030 }
3031
3032 static const intArray* sort_methods(Array<Method*>* methods) {
3033 const int length = methods->length();
3034 // If JVMTI original method ordering or sharing is enabled we have to
3035 // remember the original class file ordering.
3036 // We temporarily use the vtable_index field in the Method* to store the
3037 // class file index, so we can read in after calling qsort.
3038 // Put the method ordering in the shared archive.
3039 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3040 for (int index = 0; index < length; index++) {
3041 Method* const m = methods->at(index);
3042 assert(!m->valid_vtable_index(), "vtable index should not be set");
3043 m->set_vtable_index(index);
3044 }
3045 }
3046 // Sort method array by ascending method name (for faster lookups & vtable construction)
3047 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3048 Method::sort_methods(methods);
3049
3050 intArray* method_ordering = NULL;
3051 // If JVMTI original method ordering or sharing is enabled construct int
3052 // array remembering the original ordering
3053 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3054 method_ordering = new intArray(length, length, -1);
3055 for (int index = 0; index < length; index++) {
3056 Method* const m = methods->at(index);
3057 const int old_index = m->vtable_index();
3058 assert(old_index >= 0 && old_index < length, "invalid method index");
3059 method_ordering->at_put(index, old_index);
3060 m->set_vtable_index(Method::invalid_vtable_index);
3061 }
3062 }
3063 return method_ordering;
3064 }
3065
3066 // Parse generic_signature attribute for methods and fields
3067 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3068 TRAPS) {
3069 assert(cfs != NULL, "invariant");
3070
3071 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3072 const u2 generic_signature_index = cfs->get_u2_fast();
3073 check_property(
3074 valid_symbol_at(generic_signature_index),
3075 "Invalid Signature attribute at constant pool index %u in class file %s",
3076 generic_signature_index, CHECK_0);
3077 return generic_signature_index;
3078 }
3079
3080 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3081 TRAPS) {
3082
3083 assert(cfs != NULL, "invariant");
3084
3085 cfs->guarantee_more(2, CHECK); // sourcefile_index
3086 const u2 sourcefile_index = cfs->get_u2_fast();
3087 check_property(
3088 valid_symbol_at(sourcefile_index),
3089 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3090 sourcefile_index, CHECK);
3091 set_class_sourcefile_index(sourcefile_index);
3092 }
3093
3094 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3095 int length,
3096 TRAPS) {
3097 assert(cfs != NULL, "invariant");
3098
3099 const u1* const sde_buffer = cfs->current();
3100 assert(sde_buffer != NULL, "null sde buffer");
3101
3102 // Don't bother storing it if there is no way to retrieve it
3103 if (JvmtiExport::can_get_source_debug_extension()) {
3104 assert((length+1) > length, "Overflow checking");
3105 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3106 for (int i = 0; i < length; i++) {
3107 sde[i] = sde_buffer[i];
3108 }
3109 sde[length] = '\0';
3110 set_class_sde_buffer((const char*)sde, length);
3111 }
3112 // Got utf8 string, set stream position forward
3113 cfs->skip_u1(length, CHECK);
3114 }
3115
3116
3117 // Inner classes can be static, private or protected (classic VM does this)
3118 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3119 JVM_ACC_PRIVATE | \
3120 JVM_ACC_PROTECTED | \
3121 JVM_ACC_STATIC \
3122 )
3123
3124 // Return number of classes in the inner classes attribute table
3125 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3126 const u1* const inner_classes_attribute_start,
3127 bool parsed_enclosingmethod_attribute,
3128 u2 enclosing_method_class_index,
3129 u2 enclosing_method_method_index,
3130 TRAPS) {
3131 const u1* const current_mark = cfs->current();
3132 u2 length = 0;
3133 if (inner_classes_attribute_start != NULL) {
3134 cfs->set_current(inner_classes_attribute_start);
3135 cfs->guarantee_more(2, CHECK_0); // length
3136 length = cfs->get_u2_fast();
3137 }
3138
3139 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3140 // method data:
3141 // [inner_class_info_index,
3142 // outer_class_info_index,
3143 // inner_name_index,
3144 // inner_class_access_flags,
3145 // ...
3146 // enclosing_method_class_index,
3147 // enclosing_method_method_index]
3148 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3149 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3150 _inner_classes = inner_classes;
3151
3152 int index = 0;
3153 const int cp_size = _cp->length();
3154 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3155 for (int n = 0; n < length; n++) {
3156 // Inner class index
3157 const u2 inner_class_info_index = cfs->get_u2_fast();
3158 check_property(
3159 valid_klass_reference_at(inner_class_info_index),
3160 "inner_class_info_index %u has bad constant type in class file %s",
3161 inner_class_info_index, CHECK_0);
3162 // Outer class index
3163 const u2 outer_class_info_index = cfs->get_u2_fast();
3164 check_property(
3165 outer_class_info_index == 0 ||
3166 valid_klass_reference_at(outer_class_info_index),
3167 "outer_class_info_index %u has bad constant type in class file %s",
3168 outer_class_info_index, CHECK_0);
3169 // Inner class name
3170 const u2 inner_name_index = cfs->get_u2_fast();
3171 check_property(
3172 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3173 "inner_name_index %u has bad constant type in class file %s",
3174 inner_name_index, CHECK_0);
3175 if (_need_verify) {
3176 guarantee_property(inner_class_info_index != outer_class_info_index,
3177 "Class is both outer and inner class in class file %s", CHECK_0);
3178 }
3179 // Access flags
3180 jint flags;
3181 // JVM_ACC_MODULE is defined in JDK-9 and later.
3182 if (_major_version >= JAVA_9_VERSION) {
3183 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3184 } else {
3185 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3186 }
3187 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3188 // Set abstract bit for old class files for backward compatibility
3189 flags |= JVM_ACC_ABSTRACT;
3190 }
3191 verify_legal_class_modifiers(flags, CHECK_0);
3192 AccessFlags inner_access_flags(flags);
3193
3194 inner_classes->at_put(index++, inner_class_info_index);
3195 inner_classes->at_put(index++, outer_class_info_index);
3196 inner_classes->at_put(index++, inner_name_index);
3197 inner_classes->at_put(index++, inner_access_flags.as_short());
3198 }
3199
3200 // 4347400: make sure there's no duplicate entry in the classes array
3201 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3202 for(int i = 0; i < length * 4; i += 4) {
3203 for(int j = i + 4; j < length * 4; j += 4) {
3204 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3205 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3206 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3207 inner_classes->at(i+3) != inner_classes->at(j+3)),
3208 "Duplicate entry in InnerClasses in class file %s",
3209 CHECK_0);
3210 }
3211 }
3212 }
3213
3214 // Set EnclosingMethod class and method indexes.
3215 if (parsed_enclosingmethod_attribute) {
3216 inner_classes->at_put(index++, enclosing_method_class_index);
3217 inner_classes->at_put(index++, enclosing_method_method_index);
3218 }
3219 assert(index == size, "wrong size");
3220
3221 // Restore buffer's current position.
3222 cfs->set_current(current_mark);
3223
3224 return length;
3225 }
3226
3227 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3228 set_class_synthetic_flag(true);
3229 }
3230
3231 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3232 assert(cfs != NULL, "invariant");
3233
3234 const u2 signature_index = cfs->get_u2(CHECK);
3235 check_property(
3236 valid_symbol_at(signature_index),
3237 "Invalid constant pool index %u in Signature attribute in class file %s",
3238 signature_index, CHECK);
3239 set_class_generic_signature_index(signature_index);
3240 }
3241
3242 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3243 ConstantPool* cp,
3244 u4 attribute_byte_length,
3245 TRAPS) {
3246 assert(cfs != NULL, "invariant");
3247 assert(cp != NULL, "invariant");
3248
3249 const u1* const current_start = cfs->current();
3250
3251 guarantee_property(attribute_byte_length >= sizeof(u2),
3252 "Invalid BootstrapMethods attribute length %u in class file %s",
3253 attribute_byte_length,
3254 CHECK);
3255
3256 cfs->guarantee_more(attribute_byte_length, CHECK);
3257
3258 const int attribute_array_length = cfs->get_u2_fast();
3259
3260 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3261 "Short length on BootstrapMethods in class file %s",
3262 CHECK);
3263
3264
3265 // The attribute contains a counted array of counted tuples of shorts,
3266 // represending bootstrap specifiers:
3267 // length*{bootstrap_method_index, argument_count*{argument_index}}
3268 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3269 // operand_count = number of shorts in attr, except for leading length
3270
3271 // The attribute is copied into a short[] array.
3272 // The array begins with a series of short[2] pairs, one for each tuple.
3273 const int index_size = (attribute_array_length * 2);
3274
3275 Array<u2>* const operands =
3276 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3277
3278 // Eagerly assign operands so they will be deallocated with the constant
3279 // pool if there is an error.
3280 cp->set_operands(operands);
3281
3282 int operand_fill_index = index_size;
3283 const int cp_size = cp->length();
3284
3285 for (int n = 0; n < attribute_array_length; n++) {
3286 // Store a 32-bit offset into the header of the operand array.
3287 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3288
3289 // Read a bootstrap specifier.
3290 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3291 const u2 bootstrap_method_index = cfs->get_u2_fast();
3292 const u2 argument_count = cfs->get_u2_fast();
3293 check_property(
3294 valid_cp_range(bootstrap_method_index, cp_size) &&
3295 cp->tag_at(bootstrap_method_index).is_method_handle(),
3296 "bootstrap_method_index %u has bad constant type in class file %s",
3297 bootstrap_method_index,
3298 CHECK);
3299
3300 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3301 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3302 CHECK);
3303
3304 operands->at_put(operand_fill_index++, bootstrap_method_index);
3305 operands->at_put(operand_fill_index++, argument_count);
3306
3307 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3308 for (int j = 0; j < argument_count; j++) {
3309 const u2 argument_index = cfs->get_u2_fast();
3310 check_property(
3311 valid_cp_range(argument_index, cp_size) &&
3312 cp->tag_at(argument_index).is_loadable_constant(),
3313 "argument_index %u has bad constant type in class file %s",
3314 argument_index,
3315 CHECK);
3316 operands->at_put(operand_fill_index++, argument_index);
3317 }
3318 }
3319 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3320 "Bad length on BootstrapMethods in class file %s",
3321 CHECK);
3322 }
3323
3324 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3325 ConstantPool* cp,
3326 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3327 TRAPS) {
3328 assert(cfs != NULL, "invariant");
3329 assert(cp != NULL, "invariant");
3330 assert(parsed_annotations != NULL, "invariant");
3331
3332 // Set inner classes attribute to default sentinel
3333 _inner_classes = Universe::the_empty_short_array();
3334 cfs->guarantee_more(2, CHECK); // attributes_count
3335 u2 attributes_count = cfs->get_u2_fast();
3336 bool parsed_sourcefile_attribute = false;
3337 bool parsed_innerclasses_attribute = false;
3338 bool parsed_enclosingmethod_attribute = false;
3339 bool parsed_bootstrap_methods_attribute = false;
3340 const u1* runtime_visible_annotations = NULL;
3341 int runtime_visible_annotations_length = 0;
3342 const u1* runtime_invisible_annotations = NULL;
3343 int runtime_invisible_annotations_length = 0;
3344 const u1* runtime_visible_type_annotations = NULL;
3345 int runtime_visible_type_annotations_length = 0;
3346 const u1* runtime_invisible_type_annotations = NULL;
3347 int runtime_invisible_type_annotations_length = 0;
3348 bool runtime_invisible_type_annotations_exists = false;
3349 bool runtime_invisible_annotations_exists = false;
3350 bool parsed_source_debug_ext_annotations_exist = false;
3351 const u1* inner_classes_attribute_start = NULL;
3352 u4 inner_classes_attribute_length = 0;
3353 u2 enclosing_method_class_index = 0;
3354 u2 enclosing_method_method_index = 0;
3355 // Iterate over attributes
3356 while (attributes_count--) {
3357 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3358 const u2 attribute_name_index = cfs->get_u2_fast();
3359 const u4 attribute_length = cfs->get_u4_fast();
3360 check_property(
3361 valid_symbol_at(attribute_name_index),
3362 "Attribute name has bad constant pool index %u in class file %s",
3363 attribute_name_index, CHECK);
3364 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3365 if (tag == vmSymbols::tag_source_file()) {
3366 // Check for SourceFile tag
3367 if (_need_verify) {
3368 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3369 }
3370 if (parsed_sourcefile_attribute) {
3371 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3372 } else {
3373 parsed_sourcefile_attribute = true;
3374 }
3375 parse_classfile_sourcefile_attribute(cfs, CHECK);
3376 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3377 // Check for SourceDebugExtension tag
3378 if (parsed_source_debug_ext_annotations_exist) {
3379 classfile_parse_error(
3380 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3381 }
3382 parsed_source_debug_ext_annotations_exist = true;
3383 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3384 } else if (tag == vmSymbols::tag_inner_classes()) {
3385 // Check for InnerClasses tag
3386 if (parsed_innerclasses_attribute) {
3387 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3388 } else {
3389 parsed_innerclasses_attribute = true;
3390 }
3391 inner_classes_attribute_start = cfs->current();
3392 inner_classes_attribute_length = attribute_length;
3393 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3394 } else if (tag == vmSymbols::tag_synthetic()) {
3395 // Check for Synthetic tag
3396 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3397 if (attribute_length != 0) {
3398 classfile_parse_error(
3399 "Invalid Synthetic classfile attribute length %u in class file %s",
3400 attribute_length, CHECK);
3401 }
3402 parse_classfile_synthetic_attribute(CHECK);
3403 } else if (tag == vmSymbols::tag_deprecated()) {
3404 // Check for Deprecatd tag - 4276120
3405 if (attribute_length != 0) {
3406 classfile_parse_error(
3407 "Invalid Deprecated classfile attribute length %u in class file %s",
3408 attribute_length, CHECK);
3409 }
3410 } else if (_major_version >= JAVA_1_5_VERSION) {
3411 if (tag == vmSymbols::tag_signature()) {
3412 if (_generic_signature_index != 0) {
3413 classfile_parse_error(
3414 "Multiple Signature attributes in class file %s", CHECK);
3415 }
3416 if (attribute_length != 2) {
3417 classfile_parse_error(
3418 "Wrong Signature attribute length %u in class file %s",
3419 attribute_length, CHECK);
3420 }
3421 parse_classfile_signature_attribute(cfs, CHECK);
3422 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3423 if (runtime_visible_annotations != NULL) {
3424 classfile_parse_error(
3425 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3426 }
3427 runtime_visible_annotations_length = attribute_length;
3428 runtime_visible_annotations = cfs->current();
3429 assert(runtime_visible_annotations != NULL, "null visible annotations");
3430 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3431 parse_annotations(cp,
3432 runtime_visible_annotations,
3433 runtime_visible_annotations_length,
3434 parsed_annotations,
3435 _loader_data,
3436 CHECK);
3437 cfs->skip_u1_fast(runtime_visible_annotations_length);
3438 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3439 if (runtime_invisible_annotations_exists) {
3440 classfile_parse_error(
3441 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3442 }
3443 runtime_invisible_annotations_exists = true;
3444 if (PreserveAllAnnotations) {
3445 runtime_invisible_annotations_length = attribute_length;
3446 runtime_invisible_annotations = cfs->current();
3447 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3448 }
3449 cfs->skip_u1(attribute_length, CHECK);
3450 } else if (tag == vmSymbols::tag_enclosing_method()) {
3451 if (parsed_enclosingmethod_attribute) {
3452 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3453 } else {
3454 parsed_enclosingmethod_attribute = true;
3455 }
3456 guarantee_property(attribute_length == 4,
3457 "Wrong EnclosingMethod attribute length %u in class file %s",
3458 attribute_length, CHECK);
3459 cfs->guarantee_more(4, CHECK); // class_index, method_index
3460 enclosing_method_class_index = cfs->get_u2_fast();
3461 enclosing_method_method_index = cfs->get_u2_fast();
3462 if (enclosing_method_class_index == 0) {
3463 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3464 }
3465 // Validate the constant pool indices and types
3466 check_property(valid_klass_reference_at(enclosing_method_class_index),
3467 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3468 if (enclosing_method_method_index != 0 &&
3469 (!cp->is_within_bounds(enclosing_method_method_index) ||
3470 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3471 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3472 }
3473 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3474 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3475 if (parsed_bootstrap_methods_attribute) {
3476 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3477 }
3478 parsed_bootstrap_methods_attribute = true;
3479 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3480 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3481 if (runtime_visible_type_annotations != NULL) {
3482 classfile_parse_error(
3483 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3484 }
3485 runtime_visible_type_annotations_length = attribute_length;
3486 runtime_visible_type_annotations = cfs->current();
3487 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3488 // No need for the VM to parse Type annotations
3489 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3490 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3491 if (runtime_invisible_type_annotations_exists) {
3492 classfile_parse_error(
3493 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3494 } else {
3495 runtime_invisible_type_annotations_exists = true;
3496 }
3497 if (PreserveAllAnnotations) {
3498 runtime_invisible_type_annotations_length = attribute_length;
3499 runtime_invisible_type_annotations = cfs->current();
3500 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3501 }
3502 cfs->skip_u1(attribute_length, CHECK);
3503 } else {
3504 // Unknown attribute
3505 cfs->skip_u1(attribute_length, CHECK);
3506 }
3507 } else {
3508 // Unknown attribute
3509 cfs->skip_u1(attribute_length, CHECK);
3510 }
3511 }
3512 _annotations = assemble_annotations(runtime_visible_annotations,
3513 runtime_visible_annotations_length,
3514 runtime_invisible_annotations,
3515 runtime_invisible_annotations_length,
3516 CHECK);
3517 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3518 runtime_visible_type_annotations_length,
3519 runtime_invisible_type_annotations,
3520 runtime_invisible_type_annotations_length,
3521 CHECK);
3522
3523 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3524 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3525 cfs,
3526 inner_classes_attribute_start,
3527 parsed_innerclasses_attribute,
3528 enclosing_method_class_index,
3529 enclosing_method_method_index,
3530 CHECK);
3531 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3532 guarantee_property(
3533 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3534 "Wrong InnerClasses attribute length in class file %s", CHECK);
3535 }
3536 }
3537
3538 if (_max_bootstrap_specifier_index >= 0) {
3539 guarantee_property(parsed_bootstrap_methods_attribute,
3540 "Missing BootstrapMethods attribute in class file %s", CHECK);
3541 }
3542 }
3543
3544 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3545 assert(k != NULL, "invariant");
3546
3547 if (_synthetic_flag)
3548 k->set_is_synthetic();
3549 if (_sourcefile_index != 0) {
3550 k->set_source_file_name_index(_sourcefile_index);
3551 }
3552 if (_generic_signature_index != 0) {
3553 k->set_generic_signature_index(_generic_signature_index);
3554 }
3555 if (_sde_buffer != NULL) {
3556 k->set_source_debug_extension(_sde_buffer, _sde_length);
3557 }
3558 }
3559
3560 // Create the Annotations object that will
3561 // hold the annotations array for the Klass.
3562 void ClassFileParser::create_combined_annotations(TRAPS) {
3563 if (_annotations == NULL &&
3564 _type_annotations == NULL &&
3565 _fields_annotations == NULL &&
3566 _fields_type_annotations == NULL) {
3567 // Don't create the Annotations object unnecessarily.
3568 return;
3569 }
3570
3571 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3572 annotations->set_class_annotations(_annotations);
3573 annotations->set_class_type_annotations(_type_annotations);
3574 annotations->set_fields_annotations(_fields_annotations);
3575 annotations->set_fields_type_annotations(_fields_type_annotations);
3576
3577 // This is the Annotations object that will be
3578 // assigned to InstanceKlass being constructed.
3579 _combined_annotations = annotations;
3580
3581 // The annotations arrays below has been transfered the
3582 // _combined_annotations so these fields can now be cleared.
3583 _annotations = NULL;
3584 _type_annotations = NULL;
3585 _fields_annotations = NULL;
3586 _fields_type_annotations = NULL;
3587 }
3588
3589 // Transfer ownership of metadata allocated to the InstanceKlass.
3590 void ClassFileParser::apply_parsed_class_metadata(
3591 InstanceKlass* this_klass,
3592 int java_fields_count, TRAPS) {
3593 assert(this_klass != NULL, "invariant");
3594
3595 _cp->set_pool_holder(this_klass);
3596 this_klass->set_constants(_cp);
3597 this_klass->set_fields(_fields, java_fields_count);
3598 this_klass->set_methods(_methods);
3599 this_klass->set_inner_classes(_inner_classes);
3600 this_klass->set_local_interfaces(_local_interfaces);
3601 this_klass->set_annotations(_combined_annotations);
3602 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3603 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3604 // its _super. If an OOM occurs while loading the current klass, its _super field
3605 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3606 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3607 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3608
3609 // Clear out these fields so they don't get deallocated by the destructor
3610 clear_class_metadata();
3611 }
3612
3613 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3614 int runtime_visible_annotations_length,
3615 const u1* const runtime_invisible_annotations,
3616 int runtime_invisible_annotations_length,
3617 TRAPS) {
3618 AnnotationArray* annotations = NULL;
3619 if (runtime_visible_annotations != NULL ||
3620 runtime_invisible_annotations != NULL) {
3621 annotations = MetadataFactory::new_array<u1>(_loader_data,
3622 runtime_visible_annotations_length +
3623 runtime_invisible_annotations_length,
3624 CHECK_(annotations));
3625 if (runtime_visible_annotations != NULL) {
3626 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3627 annotations->at_put(i, runtime_visible_annotations[i]);
3628 }
3629 }
3630 if (runtime_invisible_annotations != NULL) {
3631 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3632 int append = runtime_visible_annotations_length+i;
3633 annotations->at_put(append, runtime_invisible_annotations[i]);
3634 }
3635 }
3636 }
3637 return annotations;
3638 }
3639
3640 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3641 const int super_class_index,
3642 const bool need_verify,
3643 TRAPS) {
3644 assert(cp != NULL, "invariant");
3645 const InstanceKlass* super_klass = NULL;
3646
3647 if (super_class_index == 0) {
3648 check_property(_class_name == vmSymbols::java_lang_Object(),
3649 "Invalid superclass index %u in class file %s",
3650 super_class_index,
3651 CHECK_NULL);
3652 } else {
3653 check_property(valid_klass_reference_at(super_class_index),
3654 "Invalid superclass index %u in class file %s",
3655 super_class_index,
3656 CHECK_NULL);
3657 // The class name should be legal because it is checked when parsing constant pool.
3658 // However, make sure it is not an array type.
3659 bool is_array = false;
3660 if (cp->tag_at(super_class_index).is_klass()) {
3661 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3662 if (need_verify)
3663 is_array = super_klass->is_array_klass();
3664 } else if (need_verify) {
3665 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3666 }
3667 if (need_verify) {
3668 guarantee_property(!is_array,
3669 "Bad superclass name in class file %s", CHECK_NULL);
3670 }
3671 }
3672 return super_klass;
3673 }
3674
3675 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3676 unsigned int nonstatic_oop_map_count,
3677 int first_nonstatic_oop_offset) {
3678
3679 unsigned int map_count =
3680 NULL == super ? 0 : super->nonstatic_oop_map_count();
3681 if (nonstatic_oop_map_count > 0) {
3682 // We have oops to add to map
3683 if (map_count == 0) {
3684 map_count = nonstatic_oop_map_count;
3685 }
3686 else {
3687 // Check whether we should add a new map block or whether the last one can
3688 // be extended
3689 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3690 const OopMapBlock* const last_map = first_map + map_count - 1;
3691
3692 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3693 if (next_offset == first_nonstatic_oop_offset) {
3694 // There is no gap bettwen superklass's last oop field and first
3695 // local oop field, merge maps.
3696 nonstatic_oop_map_count -= 1;
3697 }
3698 else {
3699 // Superklass didn't end with a oop field, add extra maps
3700 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3701 }
3702 map_count += nonstatic_oop_map_count;
3703 }
3704 }
3705 return map_count;
3706 }
3707
3708 #ifndef PRODUCT
3709 static void print_field_layout(const Symbol* name,
3710 Array<u2>* fields,
3711 const constantPoolHandle& cp,
3712 int instance_size,
3713 int instance_fields_start,
3714 int instance_fields_end,
3715 int static_fields_end) {
3716
3717 assert(name != NULL, "invariant");
3718
3719 tty->print("%s: field layout\n", name->as_klass_external_name());
3720 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3721 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3722 if (!fs.access_flags().is_static()) {
3723 tty->print(" @%3d \"%s\" %s\n",
3724 fs.offset(),
3725 fs.name()->as_klass_external_name(),
3726 fs.signature()->as_klass_external_name());
3727 }
3728 }
3729 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3730 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3731 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3732 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3733 if (fs.access_flags().is_static()) {
3734 tty->print(" @%3d \"%s\" %s\n",
3735 fs.offset(),
3736 fs.name()->as_klass_external_name(),
3737 fs.signature()->as_klass_external_name());
3738 }
3739 }
3740 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3741 tty->print("\n");
3742 }
3743 #endif
3744
3745 // Values needed for oopmap and InstanceKlass creation
3746 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3747 public:
3748 int* nonstatic_oop_offsets;
3749 unsigned int* nonstatic_oop_counts;
3750 unsigned int nonstatic_oop_map_count;
3751 unsigned int total_oop_map_count;
3752 int instance_size;
3753 int nonstatic_field_size;
3754 int static_field_size;
3755 bool has_nonstatic_fields;
3756 };
3757
3758 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3759 void ClassFileParser::layout_fields(ConstantPool* cp,
3760 const FieldAllocationCount* fac,
3761 const ClassAnnotationCollector* parsed_annotations,
3762 FieldLayoutInfo* info,
3763 TRAPS) {
3764
3765 assert(cp != NULL, "invariant");
3766
3767 // Field size and offset computation
3768 int nonstatic_field_size = _super_klass == NULL ? 0 :
3769 _super_klass->nonstatic_field_size();
3770
3771 // Count the contended fields by type.
3772 //
3773 // We ignore static fields, because @Contended is not supported for them.
3774 // The layout code below will also ignore the static fields.
3775 int nonstatic_contended_count = 0;
3776 FieldAllocationCount fac_contended;
3777 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3778 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3779 if (fs.is_contended()) {
3780 fac_contended.count[atype]++;
3781 if (!fs.access_flags().is_static()) {
3782 nonstatic_contended_count++;
3783 }
3784 }
3785 }
3786
3787
3788 // Calculate the starting byte offsets
3789 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3790 int next_static_double_offset = next_static_oop_offset +
3791 ((fac->count[STATIC_OOP]) * heapOopSize);
3792 if (fac->count[STATIC_DOUBLE]) {
3793 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3794 }
3795
3796 int next_static_word_offset = next_static_double_offset +
3797 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3798 int next_static_short_offset = next_static_word_offset +
3799 ((fac->count[STATIC_WORD]) * BytesPerInt);
3800 int next_static_byte_offset = next_static_short_offset +
3801 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3802
3803 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3804 nonstatic_field_size * heapOopSize;
3805
3806 int next_nonstatic_field_offset = nonstatic_fields_start;
3807
3808 const bool is_contended_class = parsed_annotations->is_contended();
3809
3810 // Class is contended, pad before all the fields
3811 if (is_contended_class) {
3812 next_nonstatic_field_offset += ContendedPaddingWidth;
3813 }
3814
3815 // Compute the non-contended fields count.
3816 // The packing code below relies on these counts to determine if some field
3817 // can be squeezed into the alignment gap. Contended fields are obviously
3818 // exempt from that.
3819 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3820 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3821 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3822 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3823 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3824
3825 // Total non-static fields count, including every contended field
3826 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3827 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3828 fac->count[NONSTATIC_OOP];
3829
3830 const bool super_has_nonstatic_fields =
3831 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3832 const bool has_nonstatic_fields =
3833 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3834
3835
3836 // Prepare list of oops for oop map generation.
3837 //
3838 // "offset" and "count" lists are describing the set of contiguous oop
3839 // regions. offset[i] is the start of the i-th region, which then has
3840 // count[i] oops following. Before we know how many regions are required,
3841 // we pessimistically allocate the maps to fit all the oops into the
3842 // distinct regions.
3843 //
3844 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3845 // to figure out if we still need to do this.
3846 unsigned int nonstatic_oop_map_count = 0;
3847 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3848
3849 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3850 THREAD, int, max_nonstatic_oop_maps);
3851 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3852 THREAD, unsigned int, max_nonstatic_oop_maps);
3853
3854 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3855
3856 bool compact_fields = CompactFields;
3857 int allocation_style = FieldsAllocationStyle;
3858 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3859 assert(false, "0 <= FieldsAllocationStyle <= 2");
3860 allocation_style = 1; // Optimistic
3861 }
3862
3863 // The next classes have predefined hard-coded fields offsets
3864 // (see in JavaClasses::compute_hard_coded_offsets()).
3865 // Use default fields allocation order for them.
3866 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3867 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3868 _class_name == vmSymbols::java_lang_Class() ||
3869 _class_name == vmSymbols::java_lang_ClassLoader() ||
3870 _class_name == vmSymbols::java_lang_ref_Reference() ||
3871 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3872 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3873 _class_name == vmSymbols::java_lang_String() ||
3874 _class_name == vmSymbols::java_lang_Throwable() ||
3875 _class_name == vmSymbols::java_lang_Boolean() ||
3876 _class_name == vmSymbols::java_lang_Character() ||
3877 _class_name == vmSymbols::java_lang_Float() ||
3878 _class_name == vmSymbols::java_lang_Double() ||
3879 _class_name == vmSymbols::java_lang_Byte() ||
3880 _class_name == vmSymbols::java_lang_Short() ||
3881 _class_name == vmSymbols::java_lang_Integer() ||
3882 _class_name == vmSymbols::java_lang_Long())) {
3883 allocation_style = 0; // Allocate oops first
3884 compact_fields = false; // Don't compact fields
3885 }
3886
3887 int next_nonstatic_oop_offset = 0;
3888 int next_nonstatic_double_offset = 0;
3889
3890 // Rearrange fields for a given allocation style
3891 if( allocation_style == 0 ) {
3892 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3893 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3894 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3895 (nonstatic_oop_count * heapOopSize);
3896 } else if( allocation_style == 1 ) {
3897 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3898 next_nonstatic_double_offset = next_nonstatic_field_offset;
3899 } else if( allocation_style == 2 ) {
3900 // Fields allocation: oops fields in super and sub classes are together.
3901 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3902 _super_klass->nonstatic_oop_map_size() > 0 ) {
3903 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3904 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3905 const OopMapBlock* const last_map = first_map + map_count - 1;
3906 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3907 if (next_offset == next_nonstatic_field_offset) {
3908 allocation_style = 0; // allocate oops first
3909 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3910 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3911 (nonstatic_oop_count * heapOopSize);
3912 }
3913 }
3914 if( allocation_style == 2 ) {
3915 allocation_style = 1; // allocate oops last
3916 next_nonstatic_double_offset = next_nonstatic_field_offset;
3917 }
3918 } else {
3919 ShouldNotReachHere();
3920 }
3921
3922 int nonstatic_oop_space_count = 0;
3923 int nonstatic_word_space_count = 0;
3924 int nonstatic_short_space_count = 0;
3925 int nonstatic_byte_space_count = 0;
3926 int nonstatic_oop_space_offset = 0;
3927 int nonstatic_word_space_offset = 0;
3928 int nonstatic_short_space_offset = 0;
3929 int nonstatic_byte_space_offset = 0;
3930
3931 // Try to squeeze some of the fields into the gaps due to
3932 // long/double alignment.
3933 if (nonstatic_double_count > 0) {
3934 int offset = next_nonstatic_double_offset;
3935 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3936 if (compact_fields && offset != next_nonstatic_double_offset) {
3937 // Allocate available fields into the gap before double field.
3938 int length = next_nonstatic_double_offset - offset;
3939 assert(length == BytesPerInt, "");
3940 nonstatic_word_space_offset = offset;
3941 if (nonstatic_word_count > 0) {
3942 nonstatic_word_count -= 1;
3943 nonstatic_word_space_count = 1; // Only one will fit
3944 length -= BytesPerInt;
3945 offset += BytesPerInt;
3946 }
3947 nonstatic_short_space_offset = offset;
3948 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3949 nonstatic_short_count -= 1;
3950 nonstatic_short_space_count += 1;
3951 length -= BytesPerShort;
3952 offset += BytesPerShort;
3953 }
3954 nonstatic_byte_space_offset = offset;
3955 while (length > 0 && nonstatic_byte_count > 0) {
3956 nonstatic_byte_count -= 1;
3957 nonstatic_byte_space_count += 1;
3958 length -= 1;
3959 }
3960 // Allocate oop field in the gap if there are no other fields for that.
3961 nonstatic_oop_space_offset = offset;
3962 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3963 allocation_style != 0) { // when oop fields not first
3964 nonstatic_oop_count -= 1;
3965 nonstatic_oop_space_count = 1; // Only one will fit
3966 length -= heapOopSize;
3967 offset += heapOopSize;
3968 }
3969 }
3970 }
3971
3972 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3973 (nonstatic_double_count * BytesPerLong);
3974 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3975 (nonstatic_word_count * BytesPerInt);
3976 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3977 (nonstatic_short_count * BytesPerShort);
3978 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3979 nonstatic_byte_count;
3980
3981 // let oops jump before padding with this allocation style
3982 if( allocation_style == 1 ) {
3983 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3984 if( nonstatic_oop_count > 0 ) {
3985 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
3986 }
3987 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3988 }
3989
3990 // Iterate over fields again and compute correct offsets.
3991 // The field allocation type was temporarily stored in the offset slot.
3992 // oop fields are located before non-oop fields (static and non-static).
3993 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3994
3995 // skip already laid out fields
3996 if (fs.is_offset_set()) continue;
3997
3998 // contended instance fields are handled below
3999 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4000
4001 int real_offset = 0;
4002 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4003
4004 // pack the rest of the fields
4005 switch (atype) {
4006 case STATIC_OOP:
4007 real_offset = next_static_oop_offset;
4008 next_static_oop_offset += heapOopSize;
4009 break;
4010 case STATIC_BYTE:
4011 real_offset = next_static_byte_offset;
4012 next_static_byte_offset += 1;
4013 break;
4014 case STATIC_SHORT:
4015 real_offset = next_static_short_offset;
4016 next_static_short_offset += BytesPerShort;
4017 break;
4018 case STATIC_WORD:
4019 real_offset = next_static_word_offset;
4020 next_static_word_offset += BytesPerInt;
4021 break;
4022 case STATIC_DOUBLE:
4023 real_offset = next_static_double_offset;
4024 next_static_double_offset += BytesPerLong;
4025 break;
4026 case NONSTATIC_OOP:
4027 if( nonstatic_oop_space_count > 0 ) {
4028 real_offset = nonstatic_oop_space_offset;
4029 nonstatic_oop_space_offset += heapOopSize;
4030 nonstatic_oop_space_count -= 1;
4031 } else {
4032 real_offset = next_nonstatic_oop_offset;
4033 next_nonstatic_oop_offset += heapOopSize;
4034 }
4035
4036 // Record this oop in the oop maps
4037 if( nonstatic_oop_map_count > 0 &&
4038 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4039 real_offset -
4040 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4041 heapOopSize ) {
4042 // This oop is adjacent to the previous one, add to current oop map
4043 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4044 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4045 } else {
4046 // This oop is not adjacent to the previous one, create new oop map
4047 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4048 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4049 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4050 nonstatic_oop_map_count += 1;
4051 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4052 first_nonstatic_oop_offset = real_offset;
4053 }
4054 }
4055 break;
4056 case NONSTATIC_BYTE:
4057 if( nonstatic_byte_space_count > 0 ) {
4058 real_offset = nonstatic_byte_space_offset;
4059 nonstatic_byte_space_offset += 1;
4060 nonstatic_byte_space_count -= 1;
4061 } else {
4062 real_offset = next_nonstatic_byte_offset;
4063 next_nonstatic_byte_offset += 1;
4064 }
4065 break;
4066 case NONSTATIC_SHORT:
4067 if( nonstatic_short_space_count > 0 ) {
4068 real_offset = nonstatic_short_space_offset;
4069 nonstatic_short_space_offset += BytesPerShort;
4070 nonstatic_short_space_count -= 1;
4071 } else {
4072 real_offset = next_nonstatic_short_offset;
4073 next_nonstatic_short_offset += BytesPerShort;
4074 }
4075 break;
4076 case NONSTATIC_WORD:
4077 if( nonstatic_word_space_count > 0 ) {
4078 real_offset = nonstatic_word_space_offset;
4079 nonstatic_word_space_offset += BytesPerInt;
4080 nonstatic_word_space_count -= 1;
4081 } else {
4082 real_offset = next_nonstatic_word_offset;
4083 next_nonstatic_word_offset += BytesPerInt;
4084 }
4085 break;
4086 case NONSTATIC_DOUBLE:
4087 real_offset = next_nonstatic_double_offset;
4088 next_nonstatic_double_offset += BytesPerLong;
4089 break;
4090 default:
4091 ShouldNotReachHere();
4092 }
4093 fs.set_offset(real_offset);
4094 }
4095
4096
4097 // Handle the contended cases.
4098 //
4099 // Each contended field should not intersect the cache line with another contended field.
4100 // In the absence of alignment information, we end up with pessimistically separating
4101 // the fields with full-width padding.
4102 //
4103 // Additionally, this should not break alignment for the fields, so we round the alignment up
4104 // for each field.
4105 if (nonstatic_contended_count > 0) {
4106
4107 // if there is at least one contended field, we need to have pre-padding for them
4108 next_nonstatic_padded_offset += ContendedPaddingWidth;
4109
4110 // collect all contended groups
4111 ResourceBitMap bm(cp->size());
4112 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4113 // skip already laid out fields
4114 if (fs.is_offset_set()) continue;
4115
4116 if (fs.is_contended()) {
4117 bm.set_bit(fs.contended_group());
4118 }
4119 }
4120
4121 int current_group = -1;
4122 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4123
4124 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4125
4126 // skip already laid out fields
4127 if (fs.is_offset_set()) continue;
4128
4129 // skip non-contended fields and fields from different group
4130 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4131
4132 // handle statics below
4133 if (fs.access_flags().is_static()) continue;
4134
4135 int real_offset = 0;
4136 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4137
4138 switch (atype) {
4139 case NONSTATIC_BYTE:
4140 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4141 real_offset = next_nonstatic_padded_offset;
4142 next_nonstatic_padded_offset += 1;
4143 break;
4144
4145 case NONSTATIC_SHORT:
4146 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4147 real_offset = next_nonstatic_padded_offset;
4148 next_nonstatic_padded_offset += BytesPerShort;
4149 break;
4150
4151 case NONSTATIC_WORD:
4152 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4153 real_offset = next_nonstatic_padded_offset;
4154 next_nonstatic_padded_offset += BytesPerInt;
4155 break;
4156
4157 case NONSTATIC_DOUBLE:
4158 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4159 real_offset = next_nonstatic_padded_offset;
4160 next_nonstatic_padded_offset += BytesPerLong;
4161 break;
4162
4163 case NONSTATIC_OOP:
4164 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4165 real_offset = next_nonstatic_padded_offset;
4166 next_nonstatic_padded_offset += heapOopSize;
4167
4168 // Record this oop in the oop maps
4169 if( nonstatic_oop_map_count > 0 &&
4170 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4171 real_offset -
4172 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4173 heapOopSize ) {
4174 // This oop is adjacent to the previous one, add to current oop map
4175 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4176 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4177 } else {
4178 // This oop is not adjacent to the previous one, create new oop map
4179 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4180 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4181 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4182 nonstatic_oop_map_count += 1;
4183 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4184 first_nonstatic_oop_offset = real_offset;
4185 }
4186 }
4187 break;
4188
4189 default:
4190 ShouldNotReachHere();
4191 }
4192
4193 if (fs.contended_group() == 0) {
4194 // Contended group defines the equivalence class over the fields:
4195 // the fields within the same contended group are not inter-padded.
4196 // The only exception is default group, which does not incur the
4197 // equivalence, and so requires intra-padding.
4198 next_nonstatic_padded_offset += ContendedPaddingWidth;
4199 }
4200
4201 fs.set_offset(real_offset);
4202 } // for
4203
4204 // Start laying out the next group.
4205 // Note that this will effectively pad the last group in the back;
4206 // this is expected to alleviate memory contention effects for
4207 // subclass fields and/or adjacent object.
4208 // If this was the default group, the padding is already in place.
4209 if (current_group != 0) {
4210 next_nonstatic_padded_offset += ContendedPaddingWidth;
4211 }
4212 }
4213
4214 // handle static fields
4215 }
4216
4217 // Entire class is contended, pad in the back.
4218 // This helps to alleviate memory contention effects for subclass fields
4219 // and/or adjacent object.
4220 if (is_contended_class) {
4221 next_nonstatic_padded_offset += ContendedPaddingWidth;
4222 }
4223
4224 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4225
4226 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4227 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4228 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4229
4230 int static_field_size = (static_fields_end -
4231 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4232 nonstatic_field_size = nonstatic_field_size +
4233 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4234
4235 int instance_size = align_object_size(instance_end / wordSize);
4236
4237 assert(instance_size == align_object_size(align_up(
4238 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4239 wordSize) / wordSize), "consistent layout helper value");
4240
4241 // Invariant: nonstatic_field end/start should only change if there are
4242 // nonstatic fields in the class, or if the class is contended. We compare
4243 // against the non-aligned value, so that end alignment will not fail the
4244 // assert without actually having the fields.
4245 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4246 is_contended_class ||
4247 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4248
4249 // Number of non-static oop map blocks allocated at end of klass.
4250 const unsigned int total_oop_map_count =
4251 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4252 first_nonstatic_oop_offset);
4253
4254 #ifndef PRODUCT
4255 if (PrintFieldLayout) {
4256 print_field_layout(_class_name,
4257 _fields,
4258 cp,
4259 instance_size,
4260 nonstatic_fields_start,
4261 nonstatic_fields_end,
4262 static_fields_end);
4263 }
4264
4265 #endif
4266 // Pass back information needed for InstanceKlass creation
4267 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4268 info->nonstatic_oop_counts = nonstatic_oop_counts;
4269 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4270 info->total_oop_map_count = total_oop_map_count;
4271 info->instance_size = instance_size;
4272 info->static_field_size = static_field_size;
4273 info->nonstatic_field_size = nonstatic_field_size;
4274 info->has_nonstatic_fields = has_nonstatic_fields;
4275 }
4276
4277 static void fill_oop_maps(const InstanceKlass* k,
4278 unsigned int nonstatic_oop_map_count,
4279 const int* nonstatic_oop_offsets,
4280 const unsigned int* nonstatic_oop_counts) {
4281
4282 assert(k != NULL, "invariant");
4283
4284 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4285 const InstanceKlass* const super = k->superklass();
4286 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4287 if (super_count > 0) {
4288 // Copy maps from superklass
4289 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4290 for (unsigned int i = 0; i < super_count; ++i) {
4291 *this_oop_map++ = *super_oop_map++;
4292 }
4293 }
4294
4295 if (nonstatic_oop_map_count > 0) {
4296 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4297 // The counts differ because there is no gap between superklass's last oop
4298 // field and the first local oop field. Extend the last oop map copied
4299 // from the superklass instead of creating new one.
4300 nonstatic_oop_map_count--;
4301 nonstatic_oop_offsets++;
4302 this_oop_map--;
4303 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4304 this_oop_map++;
4305 }
4306
4307 // Add new map blocks, fill them
4308 while (nonstatic_oop_map_count-- > 0) {
4309 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4310 this_oop_map->set_count(*nonstatic_oop_counts++);
4311 this_oop_map++;
4312 }
4313 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4314 this_oop_map, "sanity");
4315 }
4316 }
4317
4318
4319 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4320 assert(ik != NULL, "invariant");
4321
4322 const Klass* const super = ik->super();
4323
4324 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4325 // in which case we don't have to register objects as finalizable
4326 if (!_has_empty_finalizer) {
4327 if (_has_finalizer ||
4328 (super != NULL && super->has_finalizer())) {
4329 ik->set_has_finalizer();
4330 }
4331 }
4332
4333 #ifdef ASSERT
4334 bool f = false;
4335 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4336 vmSymbols::void_method_signature());
4337 if (m != NULL && !m->is_empty_method()) {
4338 f = true;
4339 }
4340
4341 // Spec doesn't prevent agent from redefinition of empty finalizer.
4342 // Despite the fact that it's generally bad idea and redefined finalizer
4343 // will not work as expected we shouldn't abort vm in this case
4344 if (!ik->has_redefined_this_or_super()) {
4345 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4346 }
4347 #endif
4348
4349 // Check if this klass supports the java.lang.Cloneable interface
4350 if (SystemDictionary::Cloneable_klass_loaded()) {
4351 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4352 ik->set_is_cloneable();
4353 }
4354 }
4355
4356 // Check if this klass has a vanilla default constructor
4357 if (super == NULL) {
4358 // java.lang.Object has empty default constructor
4359 ik->set_has_vanilla_constructor();
4360 } else {
4361 if (super->has_vanilla_constructor() &&
4362 _has_vanilla_constructor) {
4363 ik->set_has_vanilla_constructor();
4364 }
4365 #ifdef ASSERT
4366 bool v = false;
4367 if (super->has_vanilla_constructor()) {
4368 const Method* const constructor =
4369 ik->find_method(vmSymbols::object_initializer_name(),
4370 vmSymbols::void_method_signature());
4371 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4372 v = true;
4373 }
4374 }
4375 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4376 #endif
4377 }
4378
4379 // If it cannot be fast-path allocated, set a bit in the layout helper.
4380 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4381 assert(ik->size_helper() > 0, "layout_helper is initialized");
4382 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4383 || ik->is_abstract() || ik->is_interface()
4384 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4385 || ik->size_helper() >= FastAllocateSizeLimit) {
4386 // Forbid fast-path allocation.
4387 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4388 ik->set_layout_helper(lh);
4389 }
4390 }
4391
4392 // Attach super classes and interface classes to class loader data
4393 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4394 TRAPS) {
4395 assert(defined_klass != NULL, "invariant");
4396
4397 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4398 if (defining_loader_data->is_the_null_class_loader_data()) {
4399 // Dependencies to null class loader data are implicit.
4400 return;
4401 } else {
4402 // add super class dependency
4403 Klass* const super = defined_klass->super();
4404 if (super != NULL) {
4405 defining_loader_data->record_dependency(super);
4406 }
4407
4408 // add super interface dependencies
4409 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4410 if (local_interfaces != NULL) {
4411 const int length = local_interfaces->length();
4412 for (int i = 0; i < length; i++) {
4413 defining_loader_data->record_dependency(local_interfaces->at(i));
4414 }
4415 }
4416 }
4417 }
4418
4419 // utility methods for appending an array with check for duplicates
4420
4421 static void append_interfaces(GrowableArray<Klass*>* result,
4422 const Array<Klass*>* const ifs) {
4423 // iterate over new interfaces
4424 for (int i = 0; i < ifs->length(); i++) {
4425 Klass* const e = ifs->at(i);
4426 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4427 // add new interface
4428 result->append_if_missing(e);
4429 }
4430 }
4431
4432 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4433 Array<Klass*>* local_ifs,
4434 ClassLoaderData* loader_data,
4435 TRAPS) {
4436 assert(local_ifs != NULL, "invariant");
4437 assert(loader_data != NULL, "invariant");
4438
4439 // Compute maximum size for transitive interfaces
4440 int max_transitive_size = 0;
4441 int super_size = 0;
4442 // Add superclass transitive interfaces size
4443 if (super != NULL) {
4444 super_size = super->transitive_interfaces()->length();
4445 max_transitive_size += super_size;
4446 }
4447 // Add local interfaces' super interfaces
4448 const int local_size = local_ifs->length();
4449 for (int i = 0; i < local_size; i++) {
4450 Klass* const l = local_ifs->at(i);
4451 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4452 }
4453 // Finally add local interfaces
4454 max_transitive_size += local_size;
4455 // Construct array
4456 if (max_transitive_size == 0) {
4457 // no interfaces, use canonicalized array
4458 return Universe::the_empty_klass_array();
4459 } else if (max_transitive_size == super_size) {
4460 // no new local interfaces added, share superklass' transitive interface array
4461 return super->transitive_interfaces();
4462 } else if (max_transitive_size == local_size) {
4463 // only local interfaces added, share local interface array
4464 return local_ifs;
4465 } else {
4466 ResourceMark rm;
4467 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4468
4469 // Copy down from superclass
4470 if (super != NULL) {
4471 append_interfaces(result, super->transitive_interfaces());
4472 }
4473
4474 // Copy down from local interfaces' superinterfaces
4475 for (int i = 0; i < local_size; i++) {
4476 Klass* const l = local_ifs->at(i);
4477 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4478 }
4479 // Finally add local interfaces
4480 append_interfaces(result, local_ifs);
4481
4482 // length will be less than the max_transitive_size if duplicates were removed
4483 const int length = result->length();
4484 assert(length <= max_transitive_size, "just checking");
4485 Array<Klass*>* const new_result =
4486 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4487 for (int i = 0; i < length; i++) {
4488 Klass* const e = result->at(i);
4489 assert(e != NULL, "just checking");
4490 new_result->at_put(i, e);
4491 }
4492 return new_result;
4493 }
4494 }
4495
4496 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4497 assert(this_klass != NULL, "invariant");
4498 const Klass* const super = this_klass->super();
4499 if (super != NULL) {
4500
4501 // If the loader is not the boot loader then throw an exception if its
4502 // superclass is in package jdk.internal.reflect and its loader is not a
4503 // special reflection class loader
4504 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4505 assert(super->is_instance_klass(), "super is not instance klass");
4506 PackageEntry* super_package = super->package();
4507 if (super_package != NULL &&
4508 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4509 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4510 ResourceMark rm(THREAD);
4511 Exceptions::fthrow(
4512 THREAD_AND_LOCATION,
4513 vmSymbols::java_lang_IllegalAccessError(),
4514 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4515 this_klass->external_name(),
4516 this_klass->class_loader_data()->loader_name_and_id(),
4517 super->external_name());
4518 return;
4519 }
4520 }
4521
4522 Reflection::VerifyClassAccessResults vca_result =
4523 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4524 if (vca_result != Reflection::ACCESS_OK) {
4525 ResourceMark rm(THREAD);
4526 char* msg = Reflection::verify_class_access_msg(this_klass,
4527 InstanceKlass::cast(super),
4528 vca_result);
4529 if (msg == NULL) {
4530 Exceptions::fthrow(
4531 THREAD_AND_LOCATION,
4532 vmSymbols::java_lang_IllegalAccessError(),
4533 "class %s cannot access its superclass %s",
4534 this_klass->external_name(),
4535 super->external_name());
4536 } else {
4537 // Add additional message content.
4538 Exceptions::fthrow(
4539 THREAD_AND_LOCATION,
4540 vmSymbols::java_lang_IllegalAccessError(),
4541 "superclass access check failed: %s",
4542 msg);
4543 }
4544 }
4545 }
4546 }
4547
4548
4549 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4550 assert(this_klass != NULL, "invariant");
4551 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4552 const int lng = local_interfaces->length();
4553 for (int i = lng - 1; i >= 0; i--) {
4554 Klass* const k = local_interfaces->at(i);
4555 assert (k != NULL && k->is_interface(), "invalid interface");
4556 Reflection::VerifyClassAccessResults vca_result =
4557 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4558 if (vca_result != Reflection::ACCESS_OK) {
4559 ResourceMark rm(THREAD);
4560 char* msg = Reflection::verify_class_access_msg(this_klass,
4561 InstanceKlass::cast(k),
4562 vca_result);
4563 if (msg == NULL) {
4564 Exceptions::fthrow(
4565 THREAD_AND_LOCATION,
4566 vmSymbols::java_lang_IllegalAccessError(),
4567 "class %s cannot access its superinterface %s",
4568 this_klass->external_name(),
4569 k->external_name());
4570 } else {
4571 // Add additional message content.
4572 Exceptions::fthrow(
4573 THREAD_AND_LOCATION,
4574 vmSymbols::java_lang_IllegalAccessError(),
4575 "superinterface check failed: %s",
4576 msg);
4577 }
4578 }
4579 }
4580 }
4581
4582
4583 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4584 assert(this_klass != NULL, "invariant");
4585 const Array<Method*>* const methods = this_klass->methods();
4586 const int num_methods = methods->length();
4587
4588 // go thru each method and check if it overrides a final method
4589 for (int index = 0; index < num_methods; index++) {
4590 const Method* const m = methods->at(index);
4591
4592 // skip private, static, and <init> methods
4593 if ((!m->is_private() && !m->is_static()) &&
4594 (m->name() != vmSymbols::object_initializer_name())) {
4595
4596 const Symbol* const name = m->name();
4597 const Symbol* const signature = m->signature();
4598 const Klass* k = this_klass->super();
4599 const Method* super_m = NULL;
4600 while (k != NULL) {
4601 // skip supers that don't have final methods.
4602 if (k->has_final_method()) {
4603 // lookup a matching method in the super class hierarchy
4604 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4605 if (super_m == NULL) {
4606 break; // didn't find any match; get out
4607 }
4608
4609 if (super_m->is_final() && !super_m->is_static() &&
4610 // matching method in super is final, and not static
4611 (Reflection::verify_field_access(this_klass,
4612 super_m->method_holder(),
4613 super_m->method_holder(),
4614 super_m->access_flags(), false))
4615 // this class can access super final method and therefore override
4616 ) {
4617 ResourceMark rm(THREAD);
4618 Exceptions::fthrow(
4619 THREAD_AND_LOCATION,
4620 vmSymbols::java_lang_VerifyError(),
4621 "class %s overrides final method %s.%s%s",
4622 this_klass->external_name(),
4623 super_m->method_holder()->external_name(),
4624 name->as_C_string(),
4625 signature->as_C_string()
4626 );
4627 return;
4628 }
4629
4630 // continue to look from super_m's holder's super.
4631 k = super_m->method_holder()->super();
4632 continue;
4633 }
4634
4635 k = k->super();
4636 }
4637 }
4638 }
4639 }
4640
4641
4642 // assumes that this_klass is an interface
4643 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4644 assert(this_klass != NULL, "invariant");
4645 assert(this_klass->is_interface(), "not an interface");
4646 const Array<Method*>* methods = this_klass->methods();
4647 const int num_methods = methods->length();
4648
4649 for (int index = 0; index < num_methods; index++) {
4650 const Method* const m = methods->at(index);
4651 // if m is static and not the init method, throw a verify error
4652 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4653 ResourceMark rm(THREAD);
4654 Exceptions::fthrow(
4655 THREAD_AND_LOCATION,
4656 vmSymbols::java_lang_VerifyError(),
4657 "Illegal static method %s in interface %s",
4658 m->name()->as_C_string(),
4659 this_klass->external_name()
4660 );
4661 return;
4662 }
4663 }
4664 }
4665
4666 // utility methods for format checking
4667
4668 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4669 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4670 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4671 if (is_module) {
4672 ResourceMark rm(THREAD);
4673 Exceptions::fthrow(
4674 THREAD_AND_LOCATION,
4675 vmSymbols::java_lang_NoClassDefFoundError(),
4676 "%s is not a class because access_flag ACC_MODULE is set",
4677 _class_name->as_C_string());
4678 return;
4679 }
4680
4681 if (!_need_verify) { return; }
4682
4683 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4684 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4685 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4686 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4687 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4688 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4689 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4690
4691 if ((is_abstract && is_final) ||
4692 (is_interface && !is_abstract) ||
4693 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4694 (!is_interface && major_gte_15 && is_annotation)) {
4695 ResourceMark rm(THREAD);
4696 Exceptions::fthrow(
4697 THREAD_AND_LOCATION,
4698 vmSymbols::java_lang_ClassFormatError(),
4699 "Illegal class modifiers in class %s: 0x%X",
4700 _class_name->as_C_string(), flags
4701 );
4702 return;
4703 }
4704 }
4705
4706 static bool has_illegal_visibility(jint flags) {
4707 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4708 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4709 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4710
4711 return ((is_public && is_protected) ||
4712 (is_public && is_private) ||
4713 (is_protected && is_private));
4714 }
4715
4716 // A legal major_version.minor_version must be one of the following:
4717 //
4718 // Major_version = 45, any minor_version.
4719 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
4720 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
4721 //
4722 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4723 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4724 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
4725 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4726 if (major != max_version) {
4727 ResourceMark rm(THREAD);
4728 Exceptions::fthrow(
4729 THREAD_AND_LOCATION,
4730 vmSymbols::java_lang_UnsupportedClassVersionError(),
4731 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4732 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4733 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4734 return;
4735 }
4736
4737 if (!Arguments::enable_preview()) {
4738 ResourceMark rm(THREAD);
4739 Exceptions::fthrow(
4740 THREAD_AND_LOCATION,
4741 vmSymbols::java_lang_UnsupportedClassVersionError(),
4742 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4743 class_name->as_C_string(), major, minor);
4744 return;
4745 }
4746
4747 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4748 if (major > max_version) {
4749 ResourceMark rm(THREAD);
4750 Exceptions::fthrow(
4751 THREAD_AND_LOCATION,
4752 vmSymbols::java_lang_UnsupportedClassVersionError(),
4753 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4754 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4755 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4756 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
4757 ResourceMark rm(THREAD);
4758 Exceptions::fthrow(
4759 THREAD_AND_LOCATION,
4760 vmSymbols::java_lang_UnsupportedClassVersionError(),
4761 "%s (class file version %u.%u) was compiled with an invalid major version",
4762 class_name->as_C_string(), major, minor);
4763 } else if (minor != 0) {
4764 ResourceMark rm(THREAD);
4765 Exceptions::fthrow(
4766 THREAD_AND_LOCATION,
4767 vmSymbols::java_lang_UnsupportedClassVersionError(),
4768 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4769 class_name->as_C_string(), major, minor);
4770 }
4771 }
4772 }
4773 }
4774
4775 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4776 bool is_interface,
4777 TRAPS) const {
4778 if (!_need_verify) { return; }
4779
4780 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4781 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4782 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4783 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4784 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4785 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4786 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4787 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4788 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4789
4790 bool is_illegal = false;
4791
4792 if (is_interface) {
4793 if (!is_public || !is_static || !is_final || is_private ||
4794 is_protected || is_volatile || is_transient ||
4795 (major_gte_15 && is_enum)) {
4796 is_illegal = true;
4797 }
4798 } else { // not interface
4799 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4800 is_illegal = true;
4801 }
4802 }
4803
4804 if (is_illegal) {
4805 ResourceMark rm(THREAD);
4806 Exceptions::fthrow(
4807 THREAD_AND_LOCATION,
4808 vmSymbols::java_lang_ClassFormatError(),
4809 "Illegal field modifiers in class %s: 0x%X",
4810 _class_name->as_C_string(), flags);
4811 return;
4812 }
4813 }
4814
4815 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4816 bool is_interface,
4817 const Symbol* name,
4818 TRAPS) const {
4819 if (!_need_verify) { return; }
4820
4821 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4822 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4823 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4824 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4825 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4826 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4827 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4828 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4829 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4830 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4831 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4832 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4833 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4834
4835 bool is_illegal = false;
4836
4837 if (is_interface) {
4838 if (major_gte_8) {
4839 // Class file version is JAVA_8_VERSION or later Methods of
4840 // interfaces may set any of the flags except ACC_PROTECTED,
4841 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4842 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4843 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4844 (is_native || is_protected || is_final || is_synchronized) ||
4845 // If a specific method of a class or interface has its
4846 // ACC_ABSTRACT flag set, it must not have any of its
4847 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4848 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4849 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4850 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4851 (is_abstract && (is_private || is_static || is_strict))) {
4852 is_illegal = true;
4853 }
4854 } else if (major_gte_15) {
4855 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4856 if (!is_public || is_private || is_protected || is_static || is_final ||
4857 is_synchronized || is_native || !is_abstract || is_strict) {
4858 is_illegal = true;
4859 }
4860 } else {
4861 // Class file version is pre-JAVA_1_5_VERSION
4862 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4863 is_illegal = true;
4864 }
4865 }
4866 } else { // not interface
4867 if (has_illegal_visibility(flags)) {
4868 is_illegal = true;
4869 } else {
4870 if (is_initializer) {
4871 if (is_static || is_final || is_synchronized || is_native ||
4872 is_abstract || (major_gte_15 && is_bridge)) {
4873 is_illegal = true;
4874 }
4875 } else { // not initializer
4876 if (is_abstract) {
4877 if ((is_final || is_native || is_private || is_static ||
4878 (major_gte_15 && (is_synchronized || is_strict)))) {
4879 is_illegal = true;
4880 }
4881 }
4882 }
4883 }
4884 }
4885
4886 if (is_illegal) {
4887 ResourceMark rm(THREAD);
4888 Exceptions::fthrow(
4889 THREAD_AND_LOCATION,
4890 vmSymbols::java_lang_ClassFormatError(),
4891 "Method %s in class %s has illegal modifiers: 0x%X",
4892 name->as_C_string(), _class_name->as_C_string(), flags);
4893 return;
4894 }
4895 }
4896
4897 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4898 int length,
4899 TRAPS) const {
4900 assert(_need_verify, "only called when _need_verify is true");
4901 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4902 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4903 }
4904 }
4905
4906 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4907 // In class names, '/' separates unqualified names. This is verified in this function also.
4908 // Method names also may not contain the characters '<' or '>', unless <init>
4909 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4910 // method. Because these names have been checked as special cases before
4911 // calling this method in verify_legal_method_name.
4912 //
4913 // This method is also called from the modular system APIs in modules.cpp
4914 // to verify the validity of module and package names.
4915 bool ClassFileParser::verify_unqualified_name(const char* name,
4916 unsigned int length,
4917 int type) {
4918 for (const char* p = name; p != name + length;) {
4919 jchar ch = *p;
4920 if (ch < 128) {
4921 if (ch == '.' || ch == ';' || ch == '[' ) {
4922 return false; // do not permit '.', ';', or '['
4923 }
4924 if (ch == '/') {
4925 // check for '//' or leading or trailing '/' which are not legal
4926 // unqualified name must not be empty
4927 if (type == ClassFileParser::LegalClass) {
4928 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4929 return false;
4930 }
4931 } else {
4932 return false; // do not permit '/' unless it's class name
4933 }
4934 }
4935 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4936 return false; // do not permit '<' or '>' in method names
4937 }
4938 p++;
4939 } else {
4940 char* tmp_p = UTF8::next(p, &ch);
4941 p = tmp_p;
4942 }
4943 }
4944 return true;
4945 }
4946
4947 // Take pointer to a string. Skip over the longest part of the string that could
4948 // be taken as a fieldname. Allow '/' if slash_ok is true.
4949 // Return a pointer to just past the fieldname.
4950 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4951 // being true, we saw consecutive slashes (meaning we were looking for a
4952 // qualified path but found something that was badly-formed).
4953 static const char* skip_over_field_name(const char* name,
4954 bool slash_ok,
4955 unsigned int length) {
4956 const char* p;
4957 jboolean last_is_slash = false;
4958 jboolean not_first_ch = false;
4959
4960 for (p = name; p != name + length; not_first_ch = true) {
4961 const char* old_p = p;
4962 jchar ch = *p;
4963 if (ch < 128) {
4964 p++;
4965 // quick check for ascii
4966 if ((ch >= 'a' && ch <= 'z') ||
4967 (ch >= 'A' && ch <= 'Z') ||
4968 (ch == '_' || ch == '$') ||
4969 (not_first_ch && ch >= '0' && ch <= '9')) {
4970 last_is_slash = false;
4971 continue;
4972 }
4973 if (slash_ok && ch == '/') {
4974 if (last_is_slash) {
4975 return NULL; // Don't permit consecutive slashes
4976 }
4977 last_is_slash = true;
4978 continue;
4979 }
4980 }
4981 else {
4982 jint unicode_ch;
4983 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4984 p = tmp_p;
4985 last_is_slash = false;
4986 // Check if ch is Java identifier start or is Java identifier part
4987 // 4672820: call java.lang.Character methods directly without generating separate tables.
4988 EXCEPTION_MARK;
4989
4990 // return value
4991 JavaValue result(T_BOOLEAN);
4992 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4993 JavaCallArguments args;
4994 args.push_int(unicode_ch);
4995
4996 // public static boolean isJavaIdentifierStart(char ch);
4997 JavaCalls::call_static(&result,
4998 SystemDictionary::Character_klass(),
4999 vmSymbols::isJavaIdentifierStart_name(),
5000 vmSymbols::int_bool_signature(),
5001 &args,
5002 THREAD);
5003
5004 if (HAS_PENDING_EXCEPTION) {
5005 CLEAR_PENDING_EXCEPTION;
5006 return 0;
5007 }
5008 if (result.get_jboolean()) {
5009 continue;
5010 }
5011
5012 if (not_first_ch) {
5013 // public static boolean isJavaIdentifierPart(char ch);
5014 JavaCalls::call_static(&result,
5015 SystemDictionary::Character_klass(),
5016 vmSymbols::isJavaIdentifierPart_name(),
5017 vmSymbols::int_bool_signature(),
5018 &args,
5019 THREAD);
5020
5021 if (HAS_PENDING_EXCEPTION) {
5022 CLEAR_PENDING_EXCEPTION;
5023 return 0;
5024 }
5025
5026 if (result.get_jboolean()) {
5027 continue;
5028 }
5029 }
5030 }
5031 return (not_first_ch) ? old_p : NULL;
5032 }
5033 return (not_first_ch) ? p : NULL;
5034 }
5035
5036 // Take pointer to a string. Skip over the longest part of the string that could
5037 // be taken as a field signature. Allow "void" if void_ok.
5038 // Return a pointer to just past the signature.
5039 // Return NULL if no legal signature is found.
5040 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5041 bool void_ok,
5042 unsigned int length,
5043 TRAPS) const {
5044 unsigned int array_dim = 0;
5045 while (length > 0) {
5046 switch (signature[0]) {
5047 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5048 case JVM_SIGNATURE_BOOLEAN:
5049 case JVM_SIGNATURE_BYTE:
5050 case JVM_SIGNATURE_CHAR:
5051 case JVM_SIGNATURE_SHORT:
5052 case JVM_SIGNATURE_INT:
5053 case JVM_SIGNATURE_FLOAT:
5054 case JVM_SIGNATURE_LONG:
5055 case JVM_SIGNATURE_DOUBLE:
5056 return signature + 1;
5057 case JVM_SIGNATURE_CLASS: {
5058 if (_major_version < JAVA_1_5_VERSION) {
5059 // Skip over the class name if one is there
5060 const char* const p = skip_over_field_name(signature + 1, true, --length);
5061
5062 // The next character better be a semicolon
5063 if (p && (p - signature) > 1 && p[0] == ';') {
5064 return p + 1;
5065 }
5066 }
5067 else {
5068 // Skip leading 'L' and ignore first appearance of ';'
5069 length--;
5070 signature++;
5071 char* c = strchr((char*) signature, ';');
5072 // Format check signature
5073 if (c != NULL) {
5074 ResourceMark rm(THREAD);
5075 int newlen = c - (char*) signature;
5076 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5077 strncpy(sig, signature, newlen);
5078 sig[newlen] = '\0';
5079
5080 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5081 if (!legal) {
5082 classfile_parse_error("Class name contains illegal character "
5083 "in descriptor in class file %s",
5084 CHECK_0);
5085 return NULL;
5086 }
5087 return signature + newlen + 1;
5088 }
5089 }
5090 return NULL;
5091 }
5092 case JVM_SIGNATURE_ARRAY:
5093 array_dim++;
5094 if (array_dim > 255) {
5095 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5096 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5097 }
5098 // The rest of what's there better be a legal signature
5099 signature++;
5100 length--;
5101 void_ok = false;
5102 break;
5103 default:
5104 return NULL;
5105 }
5106 }
5107 return NULL;
5108 }
5109
5110 // Checks if name is a legal class name.
5111 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5112 if (!_need_verify || _relax_verify) { return; }
5113
5114 char buf[fixed_buffer_size];
5115 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5116 unsigned int length = name->utf8_length();
5117 bool legal = false;
5118
5119 if (length > 0) {
5120 const char* p;
5121 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5122 p = skip_over_field_signature(bytes, false, length, CHECK);
5123 legal = (p != NULL) && ((p - bytes) == (int)length);
5124 } else if (_major_version < JAVA_1_5_VERSION) {
5125 if (bytes[0] != '<') {
5126 p = skip_over_field_name(bytes, true, length);
5127 legal = (p != NULL) && ((p - bytes) == (int)length);
5128 }
5129 } else {
5130 // 4900761: relax the constraints based on JSR202 spec
5131 // Class names may be drawn from the entire Unicode character set.
5132 // Identifiers between '/' must be unqualified names.
5133 // The utf8 string has been verified when parsing cpool entries.
5134 legal = verify_unqualified_name(bytes, length, LegalClass);
5135 }
5136 }
5137 if (!legal) {
5138 ResourceMark rm(THREAD);
5139 assert(_class_name != NULL, "invariant");
5140 Exceptions::fthrow(
5141 THREAD_AND_LOCATION,
5142 vmSymbols::java_lang_ClassFormatError(),
5143 "Illegal class name \"%s\" in class file %s", bytes,
5144 _class_name->as_C_string()
5145 );
5146 return;
5147 }
5148 }
5149
5150 // Checks if name is a legal field name.
5151 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5152 if (!_need_verify || _relax_verify) { return; }
5153
5154 char buf[fixed_buffer_size];
5155 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5156 unsigned int length = name->utf8_length();
5157 bool legal = false;
5158
5159 if (length > 0) {
5160 if (_major_version < JAVA_1_5_VERSION) {
5161 if (bytes[0] != '<') {
5162 const char* p = skip_over_field_name(bytes, false, length);
5163 legal = (p != NULL) && ((p - bytes) == (int)length);
5164 }
5165 } else {
5166 // 4881221: relax the constraints based on JSR202 spec
5167 legal = verify_unqualified_name(bytes, length, LegalField);
5168 }
5169 }
5170
5171 if (!legal) {
5172 ResourceMark rm(THREAD);
5173 assert(_class_name != NULL, "invariant");
5174 Exceptions::fthrow(
5175 THREAD_AND_LOCATION,
5176 vmSymbols::java_lang_ClassFormatError(),
5177 "Illegal field name \"%s\" in class %s", bytes,
5178 _class_name->as_C_string()
5179 );
5180 return;
5181 }
5182 }
5183
5184 // Checks if name is a legal method name.
5185 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5186 if (!_need_verify || _relax_verify) { return; }
5187
5188 assert(name != NULL, "method name is null");
5189 char buf[fixed_buffer_size];
5190 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5191 unsigned int length = name->utf8_length();
5192 bool legal = false;
5193
5194 if (length > 0) {
5195 if (bytes[0] == '<') {
5196 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5197 legal = true;
5198 }
5199 } else if (_major_version < JAVA_1_5_VERSION) {
5200 const char* p;
5201 p = skip_over_field_name(bytes, false, length);
5202 legal = (p != NULL) && ((p - bytes) == (int)length);
5203 } else {
5204 // 4881221: relax the constraints based on JSR202 spec
5205 legal = verify_unqualified_name(bytes, length, LegalMethod);
5206 }
5207 }
5208
5209 if (!legal) {
5210 ResourceMark rm(THREAD);
5211 assert(_class_name != NULL, "invariant");
5212 Exceptions::fthrow(
5213 THREAD_AND_LOCATION,
5214 vmSymbols::java_lang_ClassFormatError(),
5215 "Illegal method name \"%s\" in class %s", bytes,
5216 _class_name->as_C_string()
5217 );
5218 return;
5219 }
5220 }
5221
5222
5223 // Checks if signature is a legal field signature.
5224 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5225 const Symbol* signature,
5226 TRAPS) const {
5227 if (!_need_verify) { return; }
5228
5229 char buf[fixed_buffer_size];
5230 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5231 const unsigned int length = signature->utf8_length();
5232 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5233
5234 if (p == NULL || (p - bytes) != (int)length) {
5235 throwIllegalSignature("Field", name, signature, CHECK);
5236 }
5237 }
5238
5239 // Checks if signature is a legal method signature.
5240 // Returns number of parameters
5241 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5242 const Symbol* signature,
5243 TRAPS) const {
5244 if (!_need_verify) {
5245 // make sure caller's args_size will be less than 0 even for non-static
5246 // method so it will be recomputed in compute_size_of_parameters().
5247 return -2;
5248 }
5249
5250 // Class initializers cannot have args for class format version >= 51.
5251 if (name == vmSymbols::class_initializer_name() &&
5252 signature != vmSymbols::void_method_signature() &&
5253 _major_version >= JAVA_7_VERSION) {
5254 throwIllegalSignature("Method", name, signature, CHECK_0);
5255 return 0;
5256 }
5257
5258 unsigned int args_size = 0;
5259 char buf[fixed_buffer_size];
5260 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5261 unsigned int length = signature->utf8_length();
5262 const char* nextp;
5263
5264 // The first character must be a '('
5265 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5266 length--;
5267 // Skip over legal field signatures
5268 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5269 while ((length > 0) && (nextp != NULL)) {
5270 args_size++;
5271 if (p[0] == 'J' || p[0] == 'D') {
5272 args_size++;
5273 }
5274 length -= nextp - p;
5275 p = nextp;
5276 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5277 }
5278 // The first non-signature thing better be a ')'
5279 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5280 length--;
5281 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5282 // All internal methods must return void
5283 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5284 return args_size;
5285 }
5286 } else {
5287 // Now we better just have a return value
5288 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5289 if (nextp && ((int)length == (nextp - p))) {
5290 return args_size;
5291 }
5292 }
5293 }
5294 }
5295 // Report error
5296 throwIllegalSignature("Method", name, signature, CHECK_0);
5297 return 0;
5298 }
5299
5300 int ClassFileParser::static_field_size() const {
5301 assert(_field_info != NULL, "invariant");
5302 return _field_info->static_field_size;
5303 }
5304
5305 int ClassFileParser::total_oop_map_count() const {
5306 assert(_field_info != NULL, "invariant");
5307 return _field_info->total_oop_map_count;
5308 }
5309
5310 jint ClassFileParser::layout_size() const {
5311 assert(_field_info != NULL, "invariant");
5312 return _field_info->instance_size;
5313 }
5314
5315 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5316 const Array<Method*>* methods) {
5317 assert(ik != NULL, "invariant");
5318 assert(methods != NULL, "invariant");
5319
5320 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5321 // (We used to do this lazily, but now we query it in Rewriter,
5322 // which is eagerly done for every method, so we might as well do it now,
5323 // when everything is fresh in memory.)
5324 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5325
5326 if (klass_id != vmSymbols::NO_SID) {
5327 for (int j = 0; j < methods->length(); ++j) {
5328 Method* method = methods->at(j);
5329 method->init_intrinsic_id();
5330
5331 if (CheckIntrinsics) {
5332 // Check if an intrinsic is defined for method 'method',
5333 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5334 if (method->intrinsic_id() != vmIntrinsics::_none &&
5335 !method->intrinsic_candidate()) {
5336 tty->print("Compiler intrinsic is defined for method [%s], "
5337 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5338 method->name_and_sig_as_C_string(),
5339 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5340 );
5341 tty->cr();
5342 DEBUG_ONLY(vm_exit(1));
5343 }
5344 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5345 // but there is no intrinsic available for it.
5346 if (method->intrinsic_candidate() &&
5347 method->intrinsic_id() == vmIntrinsics::_none) {
5348 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5349 "but no compiler intrinsic is defined for the method.%s",
5350 method->name_and_sig_as_C_string(),
5351 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5352 );
5353 tty->cr();
5354 DEBUG_ONLY(vm_exit(1));
5355 }
5356 }
5357 } // end for
5358
5359 #ifdef ASSERT
5360 if (CheckIntrinsics) {
5361 // Check for orphan methods in the current class. A method m
5362 // of a class C is orphan if an intrinsic is defined for method m,
5363 // but class C does not declare m.
5364 // The check is potentially expensive, therefore it is available
5365 // only in debug builds.
5366
5367 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5368 if (vmIntrinsics::_compiledLambdaForm == id) {
5369 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5370 // generated for the JVM from a LambdaForm and therefore no method
5371 // is defined for it.
5372 continue;
5373 }
5374
5375 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5376 // Check if the current class contains a method with the same
5377 // name, flags, signature.
5378 bool match = false;
5379 for (int j = 0; j < methods->length(); ++j) {
5380 const Method* method = methods->at(j);
5381 if (method->intrinsic_id() == id) {
5382 match = true;
5383 break;
5384 }
5385 }
5386
5387 if (!match) {
5388 char buf[1000];
5389 tty->print("Compiler intrinsic is defined for method [%s], "
5390 "but the method is not available in class [%s].%s",
5391 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5392 buf, sizeof(buf)),
5393 ik->name()->as_C_string(),
5394 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5395 );
5396 tty->cr();
5397 DEBUG_ONLY(vm_exit(1));
5398 }
5399 }
5400 } // end for
5401 } // CheckIntrinsics
5402 #endif // ASSERT
5403 }
5404 }
5405
5406 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5407 if (_klass != NULL) {
5408 return _klass;
5409 }
5410
5411 InstanceKlass* const ik =
5412 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5413
5414 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5415
5416 assert(_klass == ik, "invariant");
5417
5418 ik->set_has_passed_fingerprint_check(false);
5419 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5420 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5421 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5422 // This class matches with a class saved in an AOT library
5423 ik->set_has_passed_fingerprint_check(true);
5424 } else {
5425 ResourceMark rm;
5426 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5427 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5428 }
5429 }
5430
5431 return ik;
5432 }
5433
5434 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5435 assert(ik != NULL, "invariant");
5436
5437 // Set name and CLD before adding to CLD
5438 ik->set_class_loader_data(_loader_data);
5439 ik->set_name(_class_name);
5440
5441 // Add all classes to our internal class loader list here,
5442 // including classes in the bootstrap (NULL) class loader.
5443 const bool publicize = !is_internal();
5444
5445 _loader_data->add_class(ik, publicize);
5446
5447 set_klass_to_deallocate(ik);
5448
5449 assert(_field_info != NULL, "invariant");
5450 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5451 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5452 "sanity");
5453
5454 assert(ik->is_instance_klass(), "sanity");
5455 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5456
5457 // Fill in information already parsed
5458 ik->set_should_verify_class(_need_verify);
5459
5460 // Not yet: supers are done below to support the new subtype-checking fields
5461 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5462 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5463 assert(_fac != NULL, "invariant");
5464 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5465
5466 // this transfers ownership of a lot of arrays from
5467 // the parser onto the InstanceKlass*
5468 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5469
5470 // note that is not safe to use the fields in the parser from this point on
5471 assert(NULL == _cp, "invariant");
5472 assert(NULL == _fields, "invariant");
5473 assert(NULL == _methods, "invariant");
5474 assert(NULL == _inner_classes, "invariant");
5475 assert(NULL == _local_interfaces, "invariant");
5476 assert(NULL == _combined_annotations, "invariant");
5477
5478 if (_has_final_method) {
5479 ik->set_has_final_method();
5480 }
5481
5482 ik->copy_method_ordering(_method_ordering, CHECK);
5483 // The InstanceKlass::_methods_jmethod_ids cache
5484 // is managed on the assumption that the initial cache
5485 // size is equal to the number of methods in the class. If
5486 // that changes, then InstanceKlass::idnum_can_increment()
5487 // has to be changed accordingly.
5488 ik->set_initial_method_idnum(ik->methods()->length());
5489
5490 ik->set_this_class_index(_this_class_index);
5491
5492 if (is_anonymous()) {
5493 // _this_class_index is a CONSTANT_Class entry that refers to this
5494 // anonymous class itself. If this class needs to refer to its own methods or
5495 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5496 // _this_class_index. However, because this class is anonymous (it's
5497 // not stored in SystemDictionary), _this_class_index cannot be resolved
5498 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5499 // Therefore, we must eagerly resolve _this_class_index now.
5500 ik->constants()->klass_at_put(_this_class_index, ik);
5501 }
5502
5503 ik->set_minor_version(_minor_version);
5504 ik->set_major_version(_major_version);
5505 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5506 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5507
5508 if (_host_klass != NULL) {
5509 assert (ik->is_anonymous(), "should be the same");
5510 ik->set_host_klass(_host_klass);
5511 }
5512
5513 // Set PackageEntry for this_klass
5514 oop cl = ik->class_loader();
5515 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5516 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5517 ik->set_package(cld, CHECK);
5518
5519 const Array<Method*>* const methods = ik->methods();
5520 assert(methods != NULL, "invariant");
5521 const int methods_len = methods->length();
5522
5523 check_methods_for_intrinsics(ik, methods);
5524
5525 // Fill in field values obtained by parse_classfile_attributes
5526 if (_parsed_annotations->has_any_annotations()) {
5527 _parsed_annotations->apply_to(ik);
5528 }
5529
5530 apply_parsed_class_attributes(ik);
5531
5532 // Miranda methods
5533 if ((_num_miranda_methods > 0) ||
5534 // if this class introduced new miranda methods or
5535 (_super_klass != NULL && _super_klass->has_miranda_methods())
5536 // super class exists and this class inherited miranda methods
5537 ) {
5538 ik->set_has_miranda_methods(); // then set a flag
5539 }
5540
5541 // Fill in information needed to compute superclasses.
5542 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5543 ik->set_transitive_interfaces(_transitive_interfaces);
5544 _transitive_interfaces = NULL;
5545
5546 // Initialize itable offset tables
5547 klassItable::setup_itable_offset_table(ik);
5548
5549 // Compute transitive closure of interfaces this class implements
5550 // Do final class setup
5551 fill_oop_maps(ik,
5552 _field_info->nonstatic_oop_map_count,
5553 _field_info->nonstatic_oop_offsets,
5554 _field_info->nonstatic_oop_counts);
5555
5556 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5557 set_precomputed_flags(ik);
5558
5559 // check if this class can access its super class
5560 check_super_class_access(ik, CHECK);
5561
5562 // check if this class can access its superinterfaces
5563 check_super_interface_access(ik, CHECK);
5564
5565 // check if this class overrides any final method
5566 check_final_method_override(ik, CHECK);
5567
5568 // reject static interface methods prior to Java 8
5569 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5570 check_illegal_static_method(ik, CHECK);
5571 }
5572
5573 // Obtain this_klass' module entry
5574 ModuleEntry* module_entry = ik->module();
5575 assert(module_entry != NULL, "module_entry should always be set");
5576
5577 // Obtain java.lang.Module
5578 Handle module_handle(THREAD, module_entry->module());
5579
5580 // Allocate mirror and initialize static fields
5581 // The create_mirror() call will also call compute_modifiers()
5582 java_lang_Class::create_mirror(ik,
5583 Handle(THREAD, _loader_data->class_loader()),
5584 module_handle,
5585 _protection_domain,
5586 CHECK);
5587
5588 assert(_all_mirandas != NULL, "invariant");
5589
5590 // Generate any default methods - default methods are public interface methods
5591 // that have a default implementation. This is new with Java 8.
5592 if (_has_nonstatic_concrete_methods) {
5593 DefaultMethods::generate_default_methods(ik,
5594 _all_mirandas,
5595 CHECK);
5596 }
5597
5598 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5599 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5600 !module_entry->has_default_read_edges()) {
5601 if (!module_entry->set_has_default_read_edges()) {
5602 // We won a potential race
5603 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5604 }
5605 }
5606
5607 // Update the loader_data graph.
5608 record_defined_class_dependencies(ik, CHECK);
5609
5610 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5611
5612 if (!is_internal()) {
5613 if (log_is_enabled(Info, class, load)) {
5614 ResourceMark rm;
5615 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5616 ik->print_class_load_logging(_loader_data, module_name, _stream);
5617 }
5618
5619 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5620 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5621 log_is_enabled(Info, class, preview)) {
5622 ResourceMark rm;
5623 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
5624 }
5625
5626 if (log_is_enabled(Debug, class, resolve)) {
5627 ResourceMark rm;
5628 // print out the superclass.
5629 const char * from = ik->external_name();
5630 if (ik->java_super() != NULL) {
5631 log_debug(class, resolve)("%s %s (super)",
5632 from,
5633 ik->java_super()->external_name());
5634 }
5635 // print out each of the interface classes referred to by this class.
5636 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5637 if (local_interfaces != NULL) {
5638 const int length = local_interfaces->length();
5639 for (int i = 0; i < length; i++) {
5640 const Klass* const k = local_interfaces->at(i);
5641 const char * to = k->external_name();
5642 log_debug(class, resolve)("%s %s (interface)", from, to);
5643 }
5644 }
5645 }
5646 }
5647
5648 JFR_ONLY(INIT_ID(ik);)
5649
5650 // If we reach here, all is well.
5651 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5652 // in order for it to not be destroyed in the ClassFileParser destructor.
5653 set_klass_to_deallocate(NULL);
5654
5655 // it's official
5656 set_klass(ik);
5657
5658 debug_only(ik->verify();)
5659 }
5660
5661 // For an anonymous class that is in the unnamed package, move it to its host class's
5662 // package by prepending its host class's package name to its class name and setting
5663 // its _class_name field.
5664 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5665 ResourceMark rm(THREAD);
5666 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5667 "Anonymous class should not be in a package");
5668 const char* host_pkg_name =
5669 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5670
5671 if (host_pkg_name != NULL) {
5672 size_t host_pkg_len = strlen(host_pkg_name);
5673 int class_name_len = _class_name->utf8_length();
5674 char* new_anon_name =
5675 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5676 // Copy host package name and trailing /.
5677 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5678 new_anon_name[host_pkg_len] = '/';
5679 // Append anonymous class name. The anonymous class name can contain odd
5680 // characters. So, do a strncpy instead of using sprintf("%s...").
5681 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5682
5683 // Create a symbol and update the anonymous class name.
5684 _class_name = SymbolTable::new_symbol(new_anon_name,
5685 (int)host_pkg_len + 1 + class_name_len,
5686 CHECK);
5687 }
5688 }
5689
5690 // If the host class and the anonymous class are in the same package then do
5691 // nothing. If the anonymous class is in the unnamed package then move it to its
5692 // host's package. If the classes are in different packages then throw an IAE
5693 // exception.
5694 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5695 assert(_host_klass != NULL, "Expected an anonymous class");
5696
5697 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5698 _class_name->utf8_length(), '/');
5699 if (anon_last_slash == NULL) { // Unnamed package
5700 prepend_host_package_name(_host_klass, CHECK);
5701 } else {
5702 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5703 ResourceMark rm(THREAD);
5704 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5705 err_msg("Host class %s and anonymous class %s are in different packages",
5706 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5707 }
5708 }
5709 }
5710
5711 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5712 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5713 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5714 bool need_verify =
5715 // verifyAll
5716 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5717 // verifyRemote
5718 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5719 return !need_verify;
5720 }
5721
5722 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5723 Symbol* name,
5724 ClassLoaderData* loader_data,
5725 Handle protection_domain,
5726 const InstanceKlass* host_klass,
5727 GrowableArray<Handle>* cp_patches,
5728 Publicity pub_level,
5729 TRAPS) :
5730 _stream(stream),
5731 _requested_name(name),
5732 _loader_data(loader_data),
5733 _host_klass(host_klass),
5734 _cp_patches(cp_patches),
5735 _num_patched_klasses(0),
5736 _max_num_patched_klasses(0),
5737 _orig_cp_size(0),
5738 _first_patched_klass_resolved_index(0),
5739 _super_klass(),
5740 _cp(NULL),
5741 _fields(NULL),
5742 _methods(NULL),
5743 _inner_classes(NULL),
5744 _local_interfaces(NULL),
5745 _transitive_interfaces(NULL),
5746 _combined_annotations(NULL),
5747 _annotations(NULL),
5748 _type_annotations(NULL),
5749 _fields_annotations(NULL),
5750 _fields_type_annotations(NULL),
5751 _klass(NULL),
5752 _klass_to_deallocate(NULL),
5753 _parsed_annotations(NULL),
5754 _fac(NULL),
5755 _field_info(NULL),
5756 _method_ordering(NULL),
5757 _all_mirandas(NULL),
5758 _vtable_size(0),
5759 _itable_size(0),
5760 _num_miranda_methods(0),
5761 _rt(REF_NONE),
5762 _protection_domain(protection_domain),
5763 _access_flags(),
5764 _pub_level(pub_level),
5765 _bad_constant_seen(0),
5766 _synthetic_flag(false),
5767 _sde_length(false),
5768 _sde_buffer(NULL),
5769 _sourcefile_index(0),
5770 _generic_signature_index(0),
5771 _major_version(0),
5772 _minor_version(0),
5773 _this_class_index(0),
5774 _super_class_index(0),
5775 _itfs_len(0),
5776 _java_fields_count(0),
5777 _need_verify(false),
5778 _relax_verify(false),
5779 _has_nonstatic_concrete_methods(false),
5780 _declares_nonstatic_concrete_methods(false),
5781 _has_final_method(false),
5782 _has_finalizer(false),
5783 _has_empty_finalizer(false),
5784 _has_vanilla_constructor(false),
5785 _max_bootstrap_specifier_index(-1) {
5786
5787 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5788
5789 assert(THREAD->is_Java_thread(), "invariant");
5790 assert(_loader_data != NULL, "invariant");
5791 assert(stream != NULL, "invariant");
5792 assert(_stream != NULL, "invariant");
5793 assert(_stream->buffer() == _stream->current(), "invariant");
5794 assert(_class_name != NULL, "invariant");
5795 assert(0 == _access_flags.as_int(), "invariant");
5796
5797 // Figure out whether we can skip format checking (matching classic VM behavior)
5798 if (DumpSharedSpaces) {
5799 // verify == true means it's a 'remote' class (i.e., non-boot class)
5800 // Verification decision is based on BytecodeVerificationRemote flag
5801 // for those classes.
5802 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5803 BytecodeVerificationLocal;
5804 }
5805 else {
5806 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5807 stream->need_verify());
5808 }
5809 if (_cp_patches != NULL) {
5810 int len = _cp_patches->length();
5811 for (int i=0; i<len; i++) {
5812 if (has_cp_patch_at(i)) {
5813 Handle patch = cp_patch_at(i);
5814 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5815 // We need to append the names of the patched classes to the end of the constant pool,
5816 // because a patched class may have a Utf8 name that's not already included in the
5817 // original constant pool. These class names are used when patch_constant_pool()
5818 // calls patch_class().
5819 //
5820 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5821 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5822 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5823 _max_num_patched_klasses++;
5824 }
5825 }
5826 }
5827 }
5828
5829 // synch back verification state to stream
5830 stream->set_verify(_need_verify);
5831
5832 // Check if verification needs to be relaxed for this class file
5833 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5834 _relax_verify = relax_format_check_for(_loader_data);
5835
5836 parse_stream(stream, CHECK);
5837
5838 post_process_parsed_stream(stream, _cp, CHECK);
5839 }
5840
5841 void ClassFileParser::clear_class_metadata() {
5842 // metadata created before the instance klass is created. Must be
5843 // deallocated if classfile parsing returns an error.
5844 _cp = NULL;
5845 _fields = NULL;
5846 _methods = NULL;
5847 _inner_classes = NULL;
5848 _local_interfaces = NULL;
5849 _combined_annotations = NULL;
5850 _annotations = _type_annotations = NULL;
5851 _fields_annotations = _fields_type_annotations = NULL;
5852 }
5853
5854 // Destructor to clean up
5855 ClassFileParser::~ClassFileParser() {
5856 if (_cp != NULL) {
5857 MetadataFactory::free_metadata(_loader_data, _cp);
5858 }
5859 if (_fields != NULL) {
5860 MetadataFactory::free_array<u2>(_loader_data, _fields);
5861 }
5862
5863 if (_methods != NULL) {
5864 // Free methods
5865 InstanceKlass::deallocate_methods(_loader_data, _methods);
5866 }
5867
5868 // beware of the Universe::empty_blah_array!!
5869 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5870 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5871 }
5872
5873 // Free interfaces
5874 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5875 _local_interfaces, _transitive_interfaces);
5876
5877 if (_combined_annotations != NULL) {
5878 // After all annotations arrays have been created, they are installed into the
5879 // Annotations object that will be assigned to the InstanceKlass being created.
5880
5881 // Deallocate the Annotations object and the installed annotations arrays.
5882 _combined_annotations->deallocate_contents(_loader_data);
5883
5884 // If the _combined_annotations pointer is non-NULL,
5885 // then the other annotations fields should have been cleared.
5886 assert(_annotations == NULL, "Should have been cleared");
5887 assert(_type_annotations == NULL, "Should have been cleared");
5888 assert(_fields_annotations == NULL, "Should have been cleared");
5889 assert(_fields_type_annotations == NULL, "Should have been cleared");
5890 } else {
5891 // If the annotations arrays were not installed into the Annotations object,
5892 // then they have to be deallocated explicitly.
5893 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5894 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5895 Annotations::free_contents(_loader_data, _fields_annotations);
5896 Annotations::free_contents(_loader_data, _fields_type_annotations);
5897 }
5898
5899 clear_class_metadata();
5900 _transitive_interfaces = NULL;
5901
5902 // deallocate the klass if already created. Don't directly deallocate, but add
5903 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5904 // at a safepoint.
5905 if (_klass_to_deallocate != NULL) {
5906 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5907 }
5908 }
5909
5910 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5911 TRAPS) {
5912
5913 assert(stream != NULL, "invariant");
5914 assert(_class_name != NULL, "invariant");
5915
5916 // BEGIN STREAM PARSING
5917 stream->guarantee_more(8, CHECK); // magic, major, minor
5918 // Magic value
5919 const u4 magic = stream->get_u4_fast();
5920 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5921 "Incompatible magic value %u in class file %s",
5922 magic, CHECK);
5923
5924 // Version numbers
5925 _minor_version = stream->get_u2_fast();
5926 _major_version = stream->get_u2_fast();
5927
5928 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5929 ResourceMark rm;
5930 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5931 _major_version, _minor_version, _class_name->as_C_string());
5932 Exceptions::fthrow(
5933 THREAD_AND_LOCATION,
5934 vmSymbols::java_lang_UnsupportedClassVersionError(),
5935 "Unsupported major.minor version for dump time %u.%u",
5936 _major_version,
5937 _minor_version);
5938 }
5939
5940 // Check version numbers - we check this even with verifier off
5941 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5942
5943 stream->guarantee_more(3, CHECK); // length, first cp tag
5944 u2 cp_size = stream->get_u2_fast();
5945
5946 guarantee_property(
5947 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5948 cp_size, CHECK);
5949
5950 _orig_cp_size = cp_size;
5951 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5952 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5953 }
5954 cp_size += _max_num_patched_klasses;
5955
5956 _cp = ConstantPool::allocate(_loader_data,
5957 cp_size,
5958 CHECK);
5959
5960 ConstantPool* const cp = _cp;
5961
5962 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5963
5964 assert(cp_size == (const u2)cp->length(), "invariant");
5965
5966 // ACCESS FLAGS
5967 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5968
5969 // Access flags
5970 jint flags;
5971 // JVM_ACC_MODULE is defined in JDK-9 and later.
5972 if (_major_version >= JAVA_9_VERSION) {
5973 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5974 } else {
5975 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5976 }
5977
5978 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5979 // Set abstract bit for old class files for backward compatibility
5980 flags |= JVM_ACC_ABSTRACT;
5981 }
5982
5983 verify_legal_class_modifiers(flags, CHECK);
5984
5985 short bad_constant = class_bad_constant_seen();
5986 if (bad_constant != 0) {
5987 // Do not throw CFE until after the access_flags are checked because if
5988 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5989 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5990 }
5991
5992 _access_flags.set_flags(flags);
5993
5994 // This class and superclass
5995 _this_class_index = stream->get_u2_fast();
5996 check_property(
5997 valid_cp_range(_this_class_index, cp_size) &&
5998 cp->tag_at(_this_class_index).is_unresolved_klass(),
5999 "Invalid this class index %u in constant pool in class file %s",
6000 _this_class_index, CHECK);
6001
6002 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6003 assert(class_name_in_cp != NULL, "class_name can't be null");
6004
6005 // Update _class_name which could be null previously
6006 // to reflect the name in the constant pool
6007 _class_name = class_name_in_cp;
6008
6009 // Don't need to check whether this class name is legal or not.
6010 // It has been checked when constant pool is parsed.
6011 // However, make sure it is not an array type.
6012 if (_need_verify) {
6013 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6014 "Bad class name in class file %s",
6015 CHECK);
6016 }
6017
6018 // Checks if name in class file matches requested name
6019 if (_requested_name != NULL && _requested_name != _class_name) {
6020 ResourceMark rm(THREAD);
6021 Exceptions::fthrow(
6022 THREAD_AND_LOCATION,
6023 vmSymbols::java_lang_NoClassDefFoundError(),
6024 "%s (wrong name: %s)",
6025 _class_name->as_C_string(),
6026 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6027 );
6028 return;
6029 }
6030
6031 // if this is an anonymous class fix up its name if it's in the unnamed
6032 // package. Otherwise, throw IAE if it is in a different package than
6033 // its host class.
6034 if (_host_klass != NULL) {
6035 fix_anonymous_class_name(CHECK);
6036 }
6037
6038 // Verification prevents us from creating names with dots in them, this
6039 // asserts that that's the case.
6040 assert(is_internal_format(_class_name), "external class name format used internally");
6041
6042 if (!is_internal()) {
6043 LogTarget(Debug, class, preorder) lt;
6044 if (lt.is_enabled()){
6045 ResourceMark rm(THREAD);
6046 LogStream ls(lt);
6047 ls.print("%s", _class_name->as_klass_external_name());
6048 if (stream->source() != NULL) {
6049 ls.print(" source: %s", stream->source());
6050 }
6051 ls.cr();
6052 }
6053
6054 #if INCLUDE_CDS
6055 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6056 if (!ClassLoader::has_jrt_entry()) {
6057 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6058 DumpLoadedClassList = NULL;
6059 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6060 _host_klass == NULL) {
6061 // Only dump the classes that can be stored into CDS archive.
6062 // Anonymous classes such as generated LambdaForm classes are also not included.
6063 oop class_loader = _loader_data->class_loader();
6064 ResourceMark rm(THREAD);
6065 bool skip = false;
6066 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6067 // For the boot and platform class loaders, skip classes that are not found in the
6068 // java runtime image, such as those found in the --patch-module entries.
6069 // These classes can't be loaded from the archive during runtime.
6070 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6071 skip = true;
6072 }
6073
6074 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6075 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6076 // as they can be loaded from the archive during runtime.
6077 skip = false;
6078 }
6079 }
6080 if (skip) {
6081 tty->print_cr("skip writing class %s from source %s to classlist file",
6082 _class_name->as_C_string(), stream->source());
6083 } else {
6084 classlist_file->print_cr("%s", _class_name->as_C_string());
6085 classlist_file->flush();
6086 }
6087 }
6088 }
6089 #endif
6090 }
6091
6092 // SUPERKLASS
6093 _super_class_index = stream->get_u2_fast();
6094 _super_klass = parse_super_class(cp,
6095 _super_class_index,
6096 _need_verify,
6097 CHECK);
6098
6099 // Interfaces
6100 _itfs_len = stream->get_u2_fast();
6101 parse_interfaces(stream,
6102 _itfs_len,
6103 cp,
6104 &_has_nonstatic_concrete_methods,
6105 CHECK);
6106
6107 assert(_local_interfaces != NULL, "invariant");
6108
6109 // Fields (offsets are filled in later)
6110 _fac = new FieldAllocationCount();
6111 parse_fields(stream,
6112 _access_flags.is_interface(),
6113 _fac,
6114 cp,
6115 cp_size,
6116 &_java_fields_count,
6117 CHECK);
6118
6119 assert(_fields != NULL, "invariant");
6120
6121 // Methods
6122 AccessFlags promoted_flags;
6123 parse_methods(stream,
6124 _access_flags.is_interface(),
6125 &promoted_flags,
6126 &_has_final_method,
6127 &_declares_nonstatic_concrete_methods,
6128 CHECK);
6129
6130 assert(_methods != NULL, "invariant");
6131
6132 // promote flags from parse_methods() to the klass' flags
6133 _access_flags.add_promoted_flags(promoted_flags.as_int());
6134
6135 if (_declares_nonstatic_concrete_methods) {
6136 _has_nonstatic_concrete_methods = true;
6137 }
6138
6139 // Additional attributes/annotations
6140 _parsed_annotations = new ClassAnnotationCollector();
6141 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6142
6143 assert(_inner_classes != NULL, "invariant");
6144
6145 // Finalize the Annotations metadata object,
6146 // now that all annotation arrays have been created.
6147 create_combined_annotations(CHECK);
6148
6149 // Make sure this is the end of class file stream
6150 guarantee_property(stream->at_eos(),
6151 "Extra bytes at the end of class file %s",
6152 CHECK);
6153
6154 // all bytes in stream read and parsed
6155 }
6156
6157 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6158 ConstantPool* cp,
6159 TRAPS) {
6160 assert(stream != NULL, "invariant");
6161 assert(stream->at_eos(), "invariant");
6162 assert(cp != NULL, "invariant");
6163 assert(_loader_data != NULL, "invariant");
6164
6165 if (_class_name == vmSymbols::java_lang_Object()) {
6166 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6167 "java.lang.Object cannot implement an interface in class file %s",
6168 CHECK);
6169 }
6170 // We check super class after class file is parsed and format is checked
6171 if (_super_class_index > 0 && NULL ==_super_klass) {
6172 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6173 if (_access_flags.is_interface()) {
6174 // Before attempting to resolve the superclass, check for class format
6175 // errors not checked yet.
6176 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6177 "Interfaces must have java.lang.Object as superclass in class file %s",
6178 CHECK);
6179 }
6180 Handle loader(THREAD, _loader_data->class_loader());
6181 _super_klass = (const InstanceKlass*)
6182 SystemDictionary::resolve_super_or_fail(_class_name,
6183 super_class_name,
6184 loader,
6185 _protection_domain,
6186 true,
6187 CHECK);
6188 }
6189
6190 if (_super_klass != NULL) {
6191 if (_super_klass->has_nonstatic_concrete_methods()) {
6192 _has_nonstatic_concrete_methods = true;
6193 }
6194
6195 if (_super_klass->is_interface()) {
6196 ResourceMark rm(THREAD);
6197 Exceptions::fthrow(
6198 THREAD_AND_LOCATION,
6199 vmSymbols::java_lang_IncompatibleClassChangeError(),
6200 "class %s has interface %s as super class",
6201 _class_name->as_klass_external_name(),
6202 _super_klass->external_name()
6203 );
6204 return;
6205 }
6206 // Make sure super class is not final
6207 if (_super_klass->is_final()) {
6208 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6209 }
6210 }
6211
6212 // Compute the transitive list of all unique interfaces implemented by this class
6213 _transitive_interfaces =
6214 compute_transitive_interfaces(_super_klass,
6215 _local_interfaces,
6216 _loader_data,
6217 CHECK);
6218
6219 assert(_transitive_interfaces != NULL, "invariant");
6220
6221 // sort methods
6222 _method_ordering = sort_methods(_methods);
6223
6224 _all_mirandas = new GrowableArray<Method*>(20);
6225
6226 Handle loader(THREAD, _loader_data->class_loader());
6227 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6228 &_num_miranda_methods,
6229 _all_mirandas,
6230 _super_klass,
6231 _methods,
6232 _access_flags,
6233 _major_version,
6234 loader,
6235 _class_name,
6236 _local_interfaces,
6237 CHECK);
6238
6239 // Size of Java itable (in words)
6240 _itable_size = _access_flags.is_interface() ? 0 :
6241 klassItable::compute_itable_size(_transitive_interfaces);
6242
6243 assert(_fac != NULL, "invariant");
6244 assert(_parsed_annotations != NULL, "invariant");
6245
6246 _field_info = new FieldLayoutInfo();
6247 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6248
6249 // Compute reference typ
6250 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6251
6252 }
6253
6254 void ClassFileParser::set_klass(InstanceKlass* klass) {
6255
6256 #ifdef ASSERT
6257 if (klass != NULL) {
6258 assert(NULL == _klass, "leaking?");
6259 }
6260 #endif
6261
6262 _klass = klass;
6263 }
6264
6265 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6266
6267 #ifdef ASSERT
6268 if (klass != NULL) {
6269 assert(NULL == _klass_to_deallocate, "leaking?");
6270 }
6271 #endif
6272
6273 _klass_to_deallocate = klass;
6274 }
6275
6276 // Caller responsible for ResourceMark
6277 // clone stream with rewound position
6278 const ClassFileStream* ClassFileParser::clone_stream() const {
6279 assert(_stream != NULL, "invariant");
6280
6281 return _stream->clone();
6282 }
6283 // ----------------------------------------------------------------------------
6284 // debugging
6285
6286 #ifdef ASSERT
6287
6288 // return true if class_name contains no '.' (internal format is '/')
6289 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6290 if (class_name != NULL) {
6291 ResourceMark rm;
6292 char* name = class_name->as_C_string();
6293 return strchr(name, '.') == NULL;
6294 } else {
6295 return true;
6296 }
6297 }
6298
6299 #endif