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
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #if INCLUDE_CDS
35 #include "classfile/systemDictionaryShared.hpp"
36 #endif
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "memory/allocation.hpp"
41 #include "memory/gcLocker.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/referenceType.hpp"
45 #include "memory/universe.inline.hpp"
46 #include "oops/constantPool.hpp"
47 #include "oops/fieldStreams.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/instanceMirrorKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/klassVtable.hpp"
52 #include "oops/method.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvm.h"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/jvmtiThreadState.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/perfData.hpp"
59 #include "runtime/reflection.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/classLoadingService.hpp"
63 #include "services/threadService.hpp"
64 #include "utilities/array.hpp"
65 #include "utilities/globalDefinitions.hpp"
66 #include "utilities/ostream.hpp"
67
68 // We generally try to create the oops directly when parsing, rather than
69 // allocating temporary data structures and copying the bytes twice. A
70 // temporary area is only needed when parsing utf8 entries in the constant
71 // pool and when parsing line number tables.
72
73 // We add assert in debug mode when class format is not checked.
74
75 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
76 #define JAVA_MIN_SUPPORTED_VERSION 45
77 #define JAVA_MAX_SUPPORTED_VERSION 52
78 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
79
80 // Used for two backward compatibility reasons:
81 // - to check for new additions to the class file format in JDK1.5
82 // - to check for bug fixes in the format checker in JDK1.5
83 #define JAVA_1_5_VERSION 49
84
85 // Used for backward compatibility reasons:
86 // - to check for javac bug fixes that happened after 1.5
87 // - also used as the max version when running in jdk6
88 #define JAVA_6_VERSION 50
89
90 // Used for backward compatibility reasons:
91 // - to check NameAndType_info signatures more aggressively
92 #define JAVA_7_VERSION 51
93
94 // Extension method support.
95 #define JAVA_8_VERSION 52
96
97 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
98 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
99 // this function (_current can be allocated in a register, with scalar
100 // replacement of aggregates). The _current pointer is copied back to
101 // stream() when this function returns. DON'T call another method within
102 // this method that uses stream().
103 ClassFileStream* cfs0 = stream();
104 ClassFileStream cfs1 = *cfs0;
105 ClassFileStream* cfs = &cfs1;
106 #ifdef ASSERT
107 assert(cfs->allocated_on_stack(),"should be local");
108 u1* old_current = cfs0->current();
109 #endif
110 Handle class_loader(THREAD, _loader_data->class_loader());
111
112 // Used for batching symbol allocations.
113 const char* names[SymbolTable::symbol_alloc_batch_size];
114 int lengths[SymbolTable::symbol_alloc_batch_size];
115 int indices[SymbolTable::symbol_alloc_batch_size];
116 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
117 int names_count = 0;
118
119 // parsing Index 0 is unused
120 for (int index = 1; index < length; index++) {
121 // Each of the following case guarantees one more byte in the stream
122 // for the following tag or the access_flags following constant pool,
123 // so we don't need bounds-check for reading tag.
124 u1 tag = cfs->get_u1_fast();
125 switch (tag) {
126 case JVM_CONSTANT_Class :
127 {
128 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
129 u2 name_index = cfs->get_u2_fast();
130 _cp->klass_index_at_put(index, name_index);
131 }
132 break;
133 case JVM_CONSTANT_Fieldref :
134 {
135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
136 u2 class_index = cfs->get_u2_fast();
137 u2 name_and_type_index = cfs->get_u2_fast();
138 _cp->field_at_put(index, class_index, name_and_type_index);
139 }
140 break;
141 case JVM_CONSTANT_Methodref :
142 {
143 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
144 u2 class_index = cfs->get_u2_fast();
145 u2 name_and_type_index = cfs->get_u2_fast();
146 _cp->method_at_put(index, class_index, name_and_type_index);
147 }
148 break;
149 case JVM_CONSTANT_InterfaceMethodref :
150 {
151 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
152 u2 class_index = cfs->get_u2_fast();
153 u2 name_and_type_index = cfs->get_u2_fast();
154 _cp->interface_method_at_put(index, class_index, name_and_type_index);
155 }
156 break;
157 case JVM_CONSTANT_String :
158 {
159 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
160 u2 string_index = cfs->get_u2_fast();
161 _cp->string_index_at_put(index, string_index);
162 }
163 break;
164 case JVM_CONSTANT_MethodHandle :
165 case JVM_CONSTANT_MethodType :
166 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
167 classfile_parse_error(
168 "Class file version does not support constant tag %u in class file %s",
169 tag, CHECK);
170 }
171 if (!EnableInvokeDynamic) {
172 classfile_parse_error(
173 "This JVM does not support constant tag %u in class file %s",
174 tag, CHECK);
175 }
176 if (tag == JVM_CONSTANT_MethodHandle) {
177 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
178 u1 ref_kind = cfs->get_u1_fast();
179 u2 method_index = cfs->get_u2_fast();
180 _cp->method_handle_index_at_put(index, ref_kind, method_index);
181 } else if (tag == JVM_CONSTANT_MethodType) {
182 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
183 u2 signature_index = cfs->get_u2_fast();
184 _cp->method_type_index_at_put(index, signature_index);
185 } else {
186 ShouldNotReachHere();
187 }
188 break;
189 case JVM_CONSTANT_InvokeDynamic :
190 {
191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
192 classfile_parse_error(
193 "Class file version does not support constant tag %u in class file %s",
194 tag, CHECK);
195 }
196 if (!EnableInvokeDynamic) {
197 classfile_parse_error(
198 "This JVM does not support constant tag %u in class file %s",
199 tag, CHECK);
200 }
201 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
202 u2 bootstrap_specifier_index = cfs->get_u2_fast();
203 u2 name_and_type_index = cfs->get_u2_fast();
204 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
205 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
206 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
207 }
208 break;
209 case JVM_CONSTANT_Integer :
210 {
211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
212 u4 bytes = cfs->get_u4_fast();
213 _cp->int_at_put(index, (jint) bytes);
214 }
215 break;
216 case JVM_CONSTANT_Float :
217 {
218 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
219 u4 bytes = cfs->get_u4_fast();
220 _cp->float_at_put(index, *(jfloat*)&bytes);
221 }
222 break;
223 case JVM_CONSTANT_Long :
224 // A mangled type might cause you to overrun allocated memory
225 guarantee_property(index+1 < length,
226 "Invalid constant pool entry %u in class file %s",
227 index, CHECK);
228 {
229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
230 u8 bytes = cfs->get_u8_fast();
231 _cp->long_at_put(index, bytes);
232 }
233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
234 break;
235 case JVM_CONSTANT_Double :
236 // A mangled type might cause you to overrun allocated memory
237 guarantee_property(index+1 < length,
238 "Invalid constant pool entry %u in class file %s",
239 index, CHECK);
240 {
241 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
242 u8 bytes = cfs->get_u8_fast();
243 _cp->double_at_put(index, *(jdouble*)&bytes);
244 }
245 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
246 break;
247 case JVM_CONSTANT_NameAndType :
248 {
249 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
250 u2 name_index = cfs->get_u2_fast();
251 u2 signature_index = cfs->get_u2_fast();
252 _cp->name_and_type_at_put(index, name_index, signature_index);
253 }
254 break;
255 case JVM_CONSTANT_Utf8 :
256 {
257 cfs->guarantee_more(2, CHECK); // utf8_length
258 u2 utf8_length = cfs->get_u2_fast();
259 u1* utf8_buffer = cfs->get_u1_buffer();
260 assert(utf8_buffer != NULL, "null utf8 buffer");
261 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
262 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
263 cfs->skip_u1_fast(utf8_length);
264
265 // Before storing the symbol, make sure it's legal
266 if (_need_verify) {
267 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
268 }
269
270 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
271 Handle patch = clear_cp_patch_at(index);
272 guarantee_property(java_lang_String::is_instance(patch()),
273 "Illegal utf8 patch at %d in class file %s",
274 index, CHECK);
275 char* str = java_lang_String::as_utf8_string(patch());
276 // (could use java_lang_String::as_symbol instead, but might as well batch them)
277 utf8_buffer = (u1*) str;
278 utf8_length = (u2) strlen(str);
279 }
280
281 unsigned int hash;
282 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
283 if (result == NULL) {
284 names[names_count] = (char*)utf8_buffer;
285 lengths[names_count] = utf8_length;
286 indices[names_count] = index;
287 hashValues[names_count++] = hash;
288 if (names_count == SymbolTable::symbol_alloc_batch_size) {
289 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
290 names_count = 0;
291 }
292 } else {
293 _cp->symbol_at_put(index, result);
294 }
295 }
296 break;
297 default:
298 classfile_parse_error(
299 "Unknown constant tag %u in class file %s", tag, CHECK);
300 break;
301 }
302 }
303
304 // Allocate the remaining symbols
305 if (names_count > 0) {
306 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
307 }
308
309 // Copy _current pointer of local copy back to stream().
310 #ifdef ASSERT
311 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
312 #endif
313 cfs0->set_current(cfs1.current());
314 }
315
316 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
317
318 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
319 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
320 return cp->symbol_at(index);
321 else
322 return NULL;
323 }
324
325 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
326 ClassFileStream* cfs = stream();
327 constantPoolHandle nullHandle;
328
329 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
330 u2 length = cfs->get_u2_fast();
331 guarantee_property(
332 length >= 1, "Illegal constant pool size %u in class file %s",
333 length, CHECK_(nullHandle));
334 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
335 CHECK_(nullHandle));
336 _cp = constant_pool; // save in case of errors
337 constantPoolHandle cp (THREAD, constant_pool);
338
339 // parsing constant pool entries
340 parse_constant_pool_entries(length, CHECK_(nullHandle));
341
342 int index = 1; // declared outside of loops for portability
343
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_klass_reference_at(klass_ref_index),
360 "Invalid constant pool index %u in class file %s",
361 klass_ref_index,
362 CHECK_(nullHandle));
363 check_property(valid_cp_range(name_and_type_ref_index, length) &&
364 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
365 "Invalid constant pool index %u in class file %s",
366 name_and_type_ref_index,
367 CHECK_(nullHandle));
368 break;
369 }
370 case JVM_CONSTANT_String :
371 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
372 break;
373 case JVM_CONSTANT_Integer :
374 break;
375 case JVM_CONSTANT_Float :
376 break;
377 case JVM_CONSTANT_Long :
378 case JVM_CONSTANT_Double :
379 index++;
380 check_property(
381 (index < length && cp->tag_at(index).is_invalid()),
382 "Improper constant pool long/double index %u in class file %s",
383 index, CHECK_(nullHandle));
384 break;
385 case JVM_CONSTANT_NameAndType : {
386 if (!_need_verify) break;
387 int name_ref_index = cp->name_ref_index_at(index);
388 int signature_ref_index = cp->signature_ref_index_at(index);
389 check_property(valid_symbol_at(name_ref_index),
390 "Invalid constant pool index %u in class file %s",
391 name_ref_index, CHECK_(nullHandle));
392 check_property(valid_symbol_at(signature_ref_index),
393 "Invalid constant pool index %u in class file %s",
394 signature_ref_index, CHECK_(nullHandle));
395 break;
396 }
397 case JVM_CONSTANT_Utf8 :
398 break;
399 case JVM_CONSTANT_UnresolvedClass : // fall-through
400 case JVM_CONSTANT_UnresolvedClassInError:
401 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
402 break;
403 case JVM_CONSTANT_ClassIndex :
404 {
405 int class_index = cp->klass_index_at(index);
406 check_property(valid_symbol_at(class_index),
407 "Invalid constant pool index %u in class file %s",
408 class_index, CHECK_(nullHandle));
409 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
410 }
411 break;
412 case JVM_CONSTANT_StringIndex :
413 {
414 int string_index = cp->string_index_at(index);
415 check_property(valid_symbol_at(string_index),
416 "Invalid constant pool index %u in class file %s",
417 string_index, CHECK_(nullHandle));
418 Symbol* sym = cp->symbol_at(string_index);
419 cp->unresolved_string_at_put(index, sym);
420 }
421 break;
422 case JVM_CONSTANT_MethodHandle :
423 {
424 int ref_index = cp->method_handle_index_at(index);
425 check_property(
426 valid_cp_range(ref_index, length) &&
427 EnableInvokeDynamic,
428 "Invalid constant pool index %u in class file %s",
429 ref_index, CHECK_(nullHandle));
430 constantTag tag = cp->tag_at(ref_index);
431 int ref_kind = cp->method_handle_ref_kind_at(index);
432 switch (ref_kind) {
433 case JVM_REF_getField:
434 case JVM_REF_getStatic:
435 case JVM_REF_putField:
436 case JVM_REF_putStatic:
437 check_property(
438 tag.is_field(),
439 "Invalid constant pool index %u in class file %s (not a field)",
440 ref_index, CHECK_(nullHandle));
441 break;
442 case JVM_REF_invokeVirtual:
443 case JVM_REF_newInvokeSpecial:
444 check_property(
445 tag.is_method(),
446 "Invalid constant pool index %u in class file %s (not a method)",
447 ref_index, CHECK_(nullHandle));
448 break;
449 case JVM_REF_invokeStatic:
450 case JVM_REF_invokeSpecial:
451 check_property(tag.is_method() ||
452 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
453 "Invalid constant pool index %u in class file %s (not a method)",
454 ref_index, CHECK_(nullHandle));
455 break;
456 case JVM_REF_invokeInterface:
457 check_property(
458 tag.is_interface_method(),
459 "Invalid constant pool index %u in class file %s (not an interface method)",
460 ref_index, CHECK_(nullHandle));
461 break;
462 default:
463 classfile_parse_error(
464 "Bad method handle kind at constant pool index %u in class file %s",
465 index, CHECK_(nullHandle));
466 }
467 // Keep the ref_index unchanged. It will be indirected at link-time.
468 }
469 break;
470 case JVM_CONSTANT_MethodType :
471 {
472 int ref_index = cp->method_type_index_at(index);
473 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
474 "Invalid constant pool index %u in class file %s",
475 ref_index, CHECK_(nullHandle));
476 }
477 break;
478 case JVM_CONSTANT_InvokeDynamic :
479 {
480 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
481 check_property(valid_cp_range(name_and_type_ref_index, length) &&
482 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
483 "Invalid constant pool index %u in class file %s",
484 name_and_type_ref_index,
485 CHECK_(nullHandle));
486 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
487 break;
488 }
489 default:
490 fatal(err_msg("bad constant pool tag value %u",
491 cp->tag_at(index).value()));
492 ShouldNotReachHere();
493 break;
494 } // end of switch
495 } // end of for
496
497 if (_cp_patches != NULL) {
498 // need to treat this_class specially...
499 assert(EnableInvokeDynamic, "");
500 int this_class_index;
501 {
502 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
503 u1* mark = cfs->current();
504 u2 flags = cfs->get_u2_fast();
505 this_class_index = cfs->get_u2_fast();
506 cfs->set_current(mark); // revert to mark
507 }
508
509 for (index = 1; index < length; index++) { // Index 0 is unused
510 if (has_cp_patch_at(index)) {
511 guarantee_property(index != this_class_index,
512 "Illegal constant pool patch to self at %d in class file %s",
513 index, CHECK_(nullHandle));
514 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
515 }
516 }
517 }
518
519 if (!_need_verify) {
520 return cp;
521 }
522
523 // second verification pass - checks the strings are of the right format.
524 // but not yet to the other entries
525 for (index = 1; index < length; index++) {
526 jbyte tag = cp->tag_at(index).value();
527 switch (tag) {
528 case JVM_CONSTANT_UnresolvedClass: {
529 Symbol* class_name = cp->unresolved_klass_at(index);
530 // check the name, even if _cp_patches will overwrite it
531 verify_legal_class_name(class_name, CHECK_(nullHandle));
532 break;
533 }
534 case JVM_CONSTANT_NameAndType: {
535 if (_need_verify && _major_version >= JAVA_7_VERSION) {
536 int sig_index = cp->signature_ref_index_at(index);
537 int name_index = cp->name_ref_index_at(index);
538 Symbol* name = cp->symbol_at(name_index);
539 Symbol* sig = cp->symbol_at(sig_index);
540 guarantee_property(sig->utf8_length() != 0,
541 "Illegal zero length constant pool entry at %d in class %s",
542 sig_index, CHECK_(nullHandle));
543 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
544 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
545 } else {
546 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
547 }
548 }
549 break;
550 }
551 case JVM_CONSTANT_InvokeDynamic:
552 case JVM_CONSTANT_Fieldref:
553 case JVM_CONSTANT_Methodref:
554 case JVM_CONSTANT_InterfaceMethodref: {
555 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
556 // already verified to be utf8
557 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
558 // already verified to be utf8
559 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
560 Symbol* name = cp->symbol_at(name_ref_index);
561 Symbol* signature = cp->symbol_at(signature_ref_index);
562 if (tag == JVM_CONSTANT_Fieldref) {
563 verify_legal_field_name(name, CHECK_(nullHandle));
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 // Signature is verified above, when iterating NameAndType_info.
566 // Need only to be sure it's non-zero length and the right type.
567 if (signature->utf8_length() == 0 ||
568 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
569 throwIllegalSignature(
570 "Field", name, signature, CHECK_(nullHandle));
571 }
572 } else {
573 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
574 }
575 } else {
576 verify_legal_method_name(name, CHECK_(nullHandle));
577 if (_need_verify && _major_version >= JAVA_7_VERSION) {
578 // Signature is verified above, when iterating NameAndType_info.
579 // Need only to be sure it's non-zero length and the right type.
580 if (signature->utf8_length() == 0 ||
581 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
582 throwIllegalSignature(
583 "Method", name, signature, CHECK_(nullHandle));
584 }
585 } else {
586 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
587 }
588 if (tag == JVM_CONSTANT_Methodref) {
589 // 4509014: If a class method name begins with '<', it must be "<init>".
590 assert(name != NULL, "method name in constant pool is null");
591 unsigned int name_len = name->utf8_length();
592 if (name_len != 0 && name->byte_at(0) == '<') {
593 if (name != vmSymbols::object_initializer_name()) {
594 classfile_parse_error(
595 "Bad method name at constant pool index %u in class file %s",
596 name_ref_index, CHECK_(nullHandle));
597 }
598 }
599 }
600 }
601 break;
602 }
603 case JVM_CONSTANT_MethodHandle: {
604 int ref_index = cp->method_handle_index_at(index);
605 int ref_kind = cp->method_handle_ref_kind_at(index);
606 switch (ref_kind) {
607 case JVM_REF_invokeVirtual:
608 case JVM_REF_invokeStatic:
609 case JVM_REF_invokeSpecial:
610 case JVM_REF_newInvokeSpecial:
611 {
612 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
613 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
614 Symbol* name = cp->symbol_at(name_ref_index);
615 if (ref_kind == JVM_REF_newInvokeSpecial) {
616 if (name != vmSymbols::object_initializer_name()) {
617 classfile_parse_error(
618 "Bad constructor name at constant pool index %u in class file %s",
619 name_ref_index, CHECK_(nullHandle));
620 }
621 } else {
622 if (name == vmSymbols::object_initializer_name()) {
623 classfile_parse_error(
624 "Bad method name at constant pool index %u in class file %s",
625 name_ref_index, CHECK_(nullHandle));
626 }
627 }
628 }
629 break;
630 // Other ref_kinds are already fully checked in previous pass.
631 }
632 break;
633 }
634 case JVM_CONSTANT_MethodType: {
635 Symbol* no_name = vmSymbols::type_name(); // place holder
636 Symbol* signature = cp->method_type_signature_at(index);
637 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
638 break;
639 }
640 case JVM_CONSTANT_Utf8: {
641 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
642 }
643 } // end of switch
644 } // end of for
645
646 return cp;
647 }
648
649
650 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
651 assert(EnableInvokeDynamic, "");
652 BasicType patch_type = T_VOID;
653
654 switch (cp->tag_at(index).value()) {
655
656 case JVM_CONSTANT_UnresolvedClass :
657 // Patching a class means pre-resolving it.
658 // The name in the constant pool is ignored.
659 if (java_lang_Class::is_instance(patch())) {
660 guarantee_property(!java_lang_Class::is_primitive(patch()),
661 "Illegal class patch at %d in class file %s",
662 index, CHECK);
663 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
664 } else {
665 guarantee_property(java_lang_String::is_instance(patch()),
666 "Illegal class patch at %d in class file %s",
667 index, CHECK);
668 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
669 cp->unresolved_klass_at_put(index, name);
670 }
671 break;
672
673 case JVM_CONSTANT_String :
674 // skip this patch and don't clear it. Needs the oop array for resolved
675 // references to be created first.
676 return;
677
678 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
679 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
680 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
681 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
682 patch_prim:
683 {
684 jvalue value;
685 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
686 guarantee_property(value_type == patch_type,
687 "Illegal primitive patch at %d in class file %s",
688 index, CHECK);
689 switch (value_type) {
690 case T_INT: cp->int_at_put(index, value.i); break;
691 case T_FLOAT: cp->float_at_put(index, value.f); break;
692 case T_LONG: cp->long_at_put(index, value.j); break;
693 case T_DOUBLE: cp->double_at_put(index, value.d); break;
694 default: assert(false, "");
695 }
696 }
697 break;
698
699 default:
700 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
701 guarantee_property(!has_cp_patch_at(index),
702 "Illegal unexpected patch at %d in class file %s",
703 index, CHECK);
704 return;
705 }
706
707 // On fall-through, mark the patch as used.
708 clear_cp_patch_at(index);
709 }
710
711
712
713 class NameSigHash: public ResourceObj {
714 public:
715 Symbol* _name; // name
716 Symbol* _sig; // signature
717 NameSigHash* _next; // Next entry in hash table
718 };
719
720
721 #define HASH_ROW_SIZE 256
722
723 unsigned int hash(Symbol* name, Symbol* sig) {
724 unsigned int raw_hash = 0;
725 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
726 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
727
728 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
729 }
730
731
732 void initialize_hashtable(NameSigHash** table) {
733 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
734 }
735
736 // Return false if the name/sig combination is found in table.
737 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
738 // The old format checker uses heap sort to find duplicates.
739 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
740 // of table since we don't expect Symbol*'s to move.
741 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
742 assert(name != NULL, "name in constant pool is NULL");
743
744 // First lookup for duplicates
745 int index = hash(name, sig);
746 NameSigHash* entry = table[index];
747 while (entry != NULL) {
748 if (entry->_name == name && entry->_sig == sig) {
749 return false;
750 }
751 entry = entry->_next;
752 }
753
754 // No duplicate is found, allocate a new entry and fill it.
755 entry = new NameSigHash();
756 entry->_name = name;
757 entry->_sig = sig;
758
759 // Insert into hash table
760 entry->_next = table[index];
761 table[index] = entry;
762
763 return true;
764 }
765
766
767 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
768 Handle protection_domain,
769 Symbol* class_name,
770 bool* has_default_methods,
771 TRAPS) {
772 if (length == 0) {
773 _local_interfaces = Universe::the_empty_klass_array();
774 } else {
775 ClassFileStream* cfs = stream();
776 assert(length > 0, "only called for length>0");
777 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
778
779 int index;
780 for (index = 0; index < length; index++) {
781 u2 interface_index = cfs->get_u2(CHECK_NULL);
782 KlassHandle interf;
783 check_property(
784 valid_klass_reference_at(interface_index),
785 "Interface name has bad constant pool index %u in class file %s",
786 interface_index, CHECK_NULL);
787 if (_cp->tag_at(interface_index).is_klass()) {
788 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
789 } else {
790 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
791
792 // Don't need to check legal name because it's checked when parsing constant pool.
793 // But need to make sure it's not an array type.
794 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
795 "Bad interface name in class file %s", CHECK_NULL);
796 Handle class_loader(THREAD, _loader_data->class_loader());
797
798 // Call resolve_super so classcircularity is checked
799 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
800 unresolved_klass, class_loader, protection_domain,
801 false, CHECK_NULL);
802 interf = KlassHandle(THREAD, k);
803 }
804
805 if (!interf()->is_interface()) {
806 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
807 }
808 if (InstanceKlass::cast(interf())->has_default_methods()) {
809 *has_default_methods = true;
810 }
811 _local_interfaces->at_put(index, interf());
812 }
813
814 if (!_need_verify || length <= 1) {
815 return _local_interfaces;
816 }
817
818 // Check if there's any duplicates in interfaces
819 ResourceMark rm(THREAD);
820 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
821 THREAD, NameSigHash*, HASH_ROW_SIZE);
822 initialize_hashtable(interface_names);
823 bool dup = false;
824 Symbol* name = NULL;
825 {
826 debug_only(No_Safepoint_Verifier nsv;)
827 for (index = 0; index < length; index++) {
828 Klass* k = _local_interfaces->at(index);
829 name = InstanceKlass::cast(k)->name();
830 // If no duplicates, add (name, NULL) in hashtable interface_names.
831 if (!put_after_lookup(name, NULL, interface_names)) {
832 dup = true;
833 break;
834 }
835 }
836 }
837 if (dup) {
838 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
839 name->as_C_string(), CHECK_NULL);
840 }
841 }
842 return _local_interfaces;
843 }
844
845
846 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
847 // Make sure the constant pool entry is of a type appropriate to this field
848 guarantee_property(
849 (constantvalue_index > 0 &&
850 constantvalue_index < _cp->length()),
851 "Bad initial value index %u in ConstantValue attribute in class file %s",
852 constantvalue_index, CHECK);
853 constantTag value_type = _cp->tag_at(constantvalue_index);
854 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
855 case T_LONG:
856 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
857 break;
858 case T_FLOAT:
859 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
860 break;
861 case T_DOUBLE:
862 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
863 break;
864 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
865 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
866 break;
867 case T_OBJECT:
868 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
869 && value_type.is_string()),
870 "Bad string initial value in class file %s", CHECK);
871 break;
872 default:
873 classfile_parse_error(
874 "Unable to set initial value %u in class file %s",
875 constantvalue_index, CHECK);
876 }
877 }
878
879
880 // Parse attributes for a field.
881 void ClassFileParser::parse_field_attributes(u2 attributes_count,
882 bool is_static, u2 signature_index,
883 u2* constantvalue_index_addr,
884 bool* is_synthetic_addr,
885 u2* generic_signature_index_addr,
886 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
887 TRAPS) {
888 ClassFileStream* cfs = stream();
889 assert(attributes_count > 0, "length should be greater than 0");
890 u2 constantvalue_index = 0;
891 u2 generic_signature_index = 0;
892 bool is_synthetic = false;
893 u1* runtime_visible_annotations = NULL;
894 int runtime_visible_annotations_length = 0;
895 u1* runtime_invisible_annotations = NULL;
896 int runtime_invisible_annotations_length = 0;
897 u1* runtime_visible_type_annotations = NULL;
898 int runtime_visible_type_annotations_length = 0;
899 u1* runtime_invisible_type_annotations = NULL;
900 int runtime_invisible_type_annotations_length = 0;
901 bool runtime_invisible_type_annotations_exists = false;
902 while (attributes_count--) {
903 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
904 u2 attribute_name_index = cfs->get_u2_fast();
905 u4 attribute_length = cfs->get_u4_fast();
906 check_property(valid_symbol_at(attribute_name_index),
907 "Invalid field attribute index %u in class file %s",
908 attribute_name_index,
909 CHECK);
910 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
911 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
912 // ignore if non-static
913 if (constantvalue_index != 0) {
914 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
915 }
916 check_property(
917 attribute_length == 2,
918 "Invalid ConstantValue field attribute length %u in class file %s",
919 attribute_length, CHECK);
920 constantvalue_index = cfs->get_u2(CHECK);
921 if (_need_verify) {
922 verify_constantvalue(constantvalue_index, signature_index, CHECK);
923 }
924 } else if (attribute_name == vmSymbols::tag_synthetic()) {
925 if (attribute_length != 0) {
926 classfile_parse_error(
927 "Invalid Synthetic field attribute length %u in class file %s",
928 attribute_length, CHECK);
929 }
930 is_synthetic = true;
931 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
932 if (attribute_length != 0) {
933 classfile_parse_error(
934 "Invalid Deprecated field attribute length %u in class file %s",
935 attribute_length, CHECK);
936 }
937 } else if (_major_version >= JAVA_1_5_VERSION) {
938 if (attribute_name == vmSymbols::tag_signature()) {
939 if (attribute_length != 2) {
940 classfile_parse_error(
941 "Wrong size %u for field's Signature attribute in class file %s",
942 attribute_length, CHECK);
943 }
944 generic_signature_index = parse_generic_signature_attribute(CHECK);
945 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
946 runtime_visible_annotations_length = attribute_length;
947 runtime_visible_annotations = cfs->get_u1_buffer();
948 assert(runtime_visible_annotations != NULL, "null visible annotations");
949 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
950 parse_annotations(runtime_visible_annotations,
951 runtime_visible_annotations_length,
952 parsed_annotations,
953 CHECK);
954 cfs->skip_u1_fast(runtime_visible_annotations_length);
955 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
956 runtime_invisible_annotations_length = attribute_length;
957 runtime_invisible_annotations = cfs->get_u1_buffer();
958 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
959 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
960 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
961 if (runtime_visible_type_annotations != NULL) {
962 classfile_parse_error(
963 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
964 }
965 runtime_visible_type_annotations_length = attribute_length;
966 runtime_visible_type_annotations = cfs->get_u1_buffer();
967 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
968 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
969 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
970 if (runtime_invisible_type_annotations_exists) {
971 classfile_parse_error(
972 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
973 } else {
974 runtime_invisible_type_annotations_exists = true;
975 }
976 if (PreserveAllAnnotations) {
977 runtime_invisible_type_annotations_length = attribute_length;
978 runtime_invisible_type_annotations = cfs->get_u1_buffer();
979 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
980 }
981 cfs->skip_u1(attribute_length, CHECK);
982 } else {
983 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
984 }
985 } else {
986 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
987 }
988 }
989
990 *constantvalue_index_addr = constantvalue_index;
991 *is_synthetic_addr = is_synthetic;
992 *generic_signature_index_addr = generic_signature_index;
993 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
994 runtime_visible_annotations_length,
995 runtime_invisible_annotations,
996 runtime_invisible_annotations_length,
997 CHECK);
998 parsed_annotations->set_field_annotations(a);
999 a = assemble_annotations(runtime_visible_type_annotations,
1000 runtime_visible_type_annotations_length,
1001 runtime_invisible_type_annotations,
1002 runtime_invisible_type_annotations_length,
1003 CHECK);
1004 parsed_annotations->set_field_type_annotations(a);
1005 return;
1006 }
1007
1008
1009 // Field allocation types. Used for computing field offsets.
1010
1011 enum FieldAllocationType {
1012 STATIC_OOP, // Oops
1013 STATIC_BYTE, // Boolean, Byte, char
1014 STATIC_SHORT, // shorts
1015 STATIC_WORD, // ints
1016 STATIC_DOUBLE, // aligned long or double
1017 NONSTATIC_OOP,
1018 NONSTATIC_BYTE,
1019 NONSTATIC_SHORT,
1020 NONSTATIC_WORD,
1021 NONSTATIC_DOUBLE,
1022 MAX_FIELD_ALLOCATION_TYPE,
1023 BAD_ALLOCATION_TYPE = -1
1024 };
1025
1026 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1027 BAD_ALLOCATION_TYPE, // 0
1028 BAD_ALLOCATION_TYPE, // 1
1029 BAD_ALLOCATION_TYPE, // 2
1030 BAD_ALLOCATION_TYPE, // 3
1031 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1032 NONSTATIC_SHORT, // T_CHAR = 5,
1033 NONSTATIC_WORD, // T_FLOAT = 6,
1034 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1035 NONSTATIC_BYTE, // T_BYTE = 8,
1036 NONSTATIC_SHORT, // T_SHORT = 9,
1037 NONSTATIC_WORD, // T_INT = 10,
1038 NONSTATIC_DOUBLE, // T_LONG = 11,
1039 NONSTATIC_OOP, // T_OBJECT = 12,
1040 NONSTATIC_OOP, // T_ARRAY = 13,
1041 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1042 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1043 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1044 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1045 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1046 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1047 BAD_ALLOCATION_TYPE, // 0
1048 BAD_ALLOCATION_TYPE, // 1
1049 BAD_ALLOCATION_TYPE, // 2
1050 BAD_ALLOCATION_TYPE, // 3
1051 STATIC_BYTE , // T_BOOLEAN = 4,
1052 STATIC_SHORT, // T_CHAR = 5,
1053 STATIC_WORD, // T_FLOAT = 6,
1054 STATIC_DOUBLE, // T_DOUBLE = 7,
1055 STATIC_BYTE, // T_BYTE = 8,
1056 STATIC_SHORT, // T_SHORT = 9,
1057 STATIC_WORD, // T_INT = 10,
1058 STATIC_DOUBLE, // T_LONG = 11,
1059 STATIC_OOP, // T_OBJECT = 12,
1060 STATIC_OOP, // T_ARRAY = 13,
1061 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1062 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1063 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1064 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1065 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1066 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1067 };
1068
1069 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1070 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1071 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1072 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1073 return result;
1074 }
1075
1076 class FieldAllocationCount: public ResourceObj {
1077 public:
1078 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1079
1080 FieldAllocationCount() {
1081 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1082 count[i] = 0;
1083 }
1084 }
1085
1086 FieldAllocationType update(bool is_static, BasicType type) {
1087 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1088 // Make sure there is no overflow with injected fields.
1089 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1090 count[atype]++;
1091 return atype;
1092 }
1093 };
1094
1095 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1096 bool is_interface,
1097 FieldAllocationCount *fac,
1098 u2* java_fields_count_ptr, TRAPS) {
1099 ClassFileStream* cfs = stream();
1100 cfs->guarantee_more(2, CHECK_NULL); // length
1101 u2 length = cfs->get_u2_fast();
1102 *java_fields_count_ptr = length;
1103
1104 int num_injected = 0;
1105 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1106 int total_fields = length + num_injected;
1107
1108 // The field array starts with tuples of shorts
1109 // [access, name index, sig index, initial value index, byte offset].
1110 // A generic signature slot only exists for field with generic
1111 // signature attribute. And the access flag is set with
1112 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1113 // signature slots are at the end of the field array and after all
1114 // other fields data.
1115 //
1116 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1117 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1118 // ...
1119 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1120 // [generic signature index]
1121 // [generic signature index]
1122 // ...
1123 //
1124 // Allocate a temporary resource array for field data. For each field,
1125 // a slot is reserved in the temporary array for the generic signature
1126 // index. After parsing all fields, the data are copied to a permanent
1127 // array and any unused slots will be discarded.
1128 ResourceMark rm(THREAD);
1129 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1130 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1131
1132 // The generic signature slots start after all other fields' data.
1133 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1134 int num_generic_signature = 0;
1135 for (int n = 0; n < length; n++) {
1136 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1137
1138 AccessFlags access_flags;
1139 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1140 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1141 access_flags.set_flags(flags);
1142
1143 u2 name_index = cfs->get_u2_fast();
1144 int cp_size = _cp->length();
1145 check_property(valid_symbol_at(name_index),
1146 "Invalid constant pool index %u for field name in class file %s",
1147 name_index,
1148 CHECK_NULL);
1149 Symbol* name = _cp->symbol_at(name_index);
1150 verify_legal_field_name(name, CHECK_NULL);
1151
1152 u2 signature_index = cfs->get_u2_fast();
1153 check_property(valid_symbol_at(signature_index),
1154 "Invalid constant pool index %u for field signature in class file %s",
1155 signature_index, CHECK_NULL);
1156 Symbol* sig = _cp->symbol_at(signature_index);
1157 verify_legal_field_signature(name, sig, CHECK_NULL);
1158
1159 u2 constantvalue_index = 0;
1160 bool is_synthetic = false;
1161 u2 generic_signature_index = 0;
1162 bool is_static = access_flags.is_static();
1163 FieldAnnotationCollector parsed_annotations(_loader_data);
1164
1165 u2 attributes_count = cfs->get_u2_fast();
1166 if (attributes_count > 0) {
1167 parse_field_attributes(attributes_count, is_static, signature_index,
1168 &constantvalue_index, &is_synthetic,
1169 &generic_signature_index, &parsed_annotations,
1170 CHECK_NULL);
1171 if (parsed_annotations.field_annotations() != NULL) {
1172 if (_fields_annotations == NULL) {
1173 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1174 _loader_data, length, NULL,
1175 CHECK_NULL);
1176 }
1177 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1178 parsed_annotations.set_field_annotations(NULL);
1179 }
1180 if (parsed_annotations.field_type_annotations() != NULL) {
1181 if (_fields_type_annotations == NULL) {
1182 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1183 _loader_data, length, NULL,
1184 CHECK_NULL);
1185 }
1186 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1187 parsed_annotations.set_field_type_annotations(NULL);
1188 }
1189
1190 if (is_synthetic) {
1191 access_flags.set_is_synthetic();
1192 }
1193 if (generic_signature_index != 0) {
1194 access_flags.set_field_has_generic_signature();
1195 fa[generic_signature_slot] = generic_signature_index;
1196 generic_signature_slot ++;
1197 num_generic_signature ++;
1198 }
1199 }
1200
1201 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1202 field->initialize(access_flags.as_short(),
1203 name_index,
1204 signature_index,
1205 constantvalue_index);
1206 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1207
1208 // Remember how many oops we encountered and compute allocation type
1209 FieldAllocationType atype = fac->update(is_static, type);
1210 field->set_allocation_type(atype);
1211
1212 // After field is initialized with type, we can augment it with aux info
1213 if (parsed_annotations.has_any_annotations())
1214 parsed_annotations.apply_to(field);
1215 }
1216
1217 int index = length;
1218 if (num_injected != 0) {
1219 for (int n = 0; n < num_injected; n++) {
1220 // Check for duplicates
1221 if (injected[n].may_be_java) {
1222 Symbol* name = injected[n].name();
1223 Symbol* signature = injected[n].signature();
1224 bool duplicate = false;
1225 for (int i = 0; i < length; i++) {
1226 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1227 if (name == _cp->symbol_at(f->name_index()) &&
1228 signature == _cp->symbol_at(f->signature_index())) {
1229 // Symbol is desclared in Java so skip this one
1230 duplicate = true;
1231 break;
1232 }
1233 }
1234 if (duplicate) {
1235 // These will be removed from the field array at the end
1236 continue;
1237 }
1238 }
1239
1240 // Injected field
1241 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1242 field->initialize(JVM_ACC_FIELD_INTERNAL,
1243 injected[n].name_index,
1244 injected[n].signature_index,
1245 0);
1246
1247 BasicType type = FieldType::basic_type(injected[n].signature());
1248
1249 // Remember how many oops we encountered and compute allocation type
1250 FieldAllocationType atype = fac->update(false, type);
1251 field->set_allocation_type(atype);
1252 index++;
1253 }
1254 }
1255
1256 // Now copy the fields' data from the temporary resource array.
1257 // Sometimes injected fields already exist in the Java source so
1258 // the fields array could be too long. In that case the
1259 // fields array is trimed. Also unused slots that were reserved
1260 // for generic signature indexes are discarded.
1261 Array<u2>* fields = MetadataFactory::new_array<u2>(
1262 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1263 CHECK_NULL);
1264 _fields = fields; // save in case of error
1265 {
1266 int i = 0;
1267 for (; i < index * FieldInfo::field_slots; i++) {
1268 fields->at_put(i, fa[i]);
1269 }
1270 for (int j = total_fields * FieldInfo::field_slots;
1271 j < generic_signature_slot; j++) {
1272 fields->at_put(i++, fa[j]);
1273 }
1274 assert(i == fields->length(), "");
1275 }
1276
1277 if (_need_verify && length > 1) {
1278 // Check duplicated fields
1279 ResourceMark rm(THREAD);
1280 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1281 THREAD, NameSigHash*, HASH_ROW_SIZE);
1282 initialize_hashtable(names_and_sigs);
1283 bool dup = false;
1284 Symbol* name = NULL;
1285 Symbol* sig = NULL;
1286 {
1287 debug_only(No_Safepoint_Verifier nsv;)
1288 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1289 name = fs.name();
1290 sig = fs.signature();
1291 // If no duplicates, add name/signature in hashtable names_and_sigs.
1292 if (!put_after_lookup(name, sig, names_and_sigs)) {
1293 dup = true;
1294 break;
1295 }
1296 }
1297 }
1298 if (dup) {
1299 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1300 name->as_C_string(), sig->as_klass_external_name(), CHECK_NULL);
1301 }
1302 }
1303
1304 return fields;
1305 }
1306
1307
1308 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1309 while (length-- > 0) {
1310 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1311 }
1312 }
1313
1314
1315 u2* ClassFileParser::parse_exception_table(u4 code_length,
1316 u4 exception_table_length,
1317 TRAPS) {
1318 ClassFileStream* cfs = stream();
1319
1320 u2* exception_table_start = cfs->get_u2_buffer();
1321 assert(exception_table_start != NULL, "null exception table");
1322 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1323 // Will check legal target after parsing code array in verifier.
1324 if (_need_verify) {
1325 for (unsigned int i = 0; i < exception_table_length; i++) {
1326 u2 start_pc = cfs->get_u2_fast();
1327 u2 end_pc = cfs->get_u2_fast();
1328 u2 handler_pc = cfs->get_u2_fast();
1329 u2 catch_type_index = cfs->get_u2_fast();
1330 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1331 "Illegal exception table range in class file %s",
1332 CHECK_NULL);
1333 guarantee_property(handler_pc < code_length,
1334 "Illegal exception table handler in class file %s",
1335 CHECK_NULL);
1336 if (catch_type_index != 0) {
1337 guarantee_property(valid_klass_reference_at(catch_type_index),
1338 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1339 }
1340 }
1341 } else {
1342 cfs->skip_u2_fast(exception_table_length * 4);
1343 }
1344 return exception_table_start;
1345 }
1346
1347 void ClassFileParser::parse_linenumber_table(
1348 u4 code_attribute_length, u4 code_length,
1349 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1350 ClassFileStream* cfs = stream();
1351 unsigned int num_entries = cfs->get_u2(CHECK);
1352
1353 // Each entry is a u2 start_pc, and a u2 line_number
1354 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1355
1356 // Verify line number attribute and table length
1357 check_property(
1358 code_attribute_length == sizeof(u2) + length_in_bytes,
1359 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1360
1361 cfs->guarantee_more(length_in_bytes, CHECK);
1362
1363 if ((*write_stream) == NULL) {
1364 if (length_in_bytes > fixed_buffer_size) {
1365 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1366 } else {
1367 (*write_stream) = new CompressedLineNumberWriteStream(
1368 linenumbertable_buffer, fixed_buffer_size);
1369 }
1370 }
1371
1372 while (num_entries-- > 0) {
1373 u2 bci = cfs->get_u2_fast(); // start_pc
1374 u2 line = cfs->get_u2_fast(); // line_number
1375 guarantee_property(bci < code_length,
1376 "Invalid pc in LineNumberTable in class file %s", CHECK);
1377 (*write_stream)->write_pair(bci, line);
1378 }
1379 }
1380
1381
1382 // Class file LocalVariableTable elements.
1383 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1384 public:
1385 u2 start_bci;
1386 u2 length;
1387 u2 name_cp_index;
1388 u2 descriptor_cp_index;
1389 u2 slot;
1390 };
1391
1392
1393 class LVT_Hash: public CHeapObj<mtClass> {
1394 public:
1395 LocalVariableTableElement *_elem; // element
1396 LVT_Hash* _next; // Next entry in hash table
1397 };
1398
1399 unsigned int hash(LocalVariableTableElement *elem) {
1400 unsigned int raw_hash = elem->start_bci;
1401
1402 raw_hash = elem->length + raw_hash * 37;
1403 raw_hash = elem->name_cp_index + raw_hash * 37;
1404 raw_hash = elem->slot + raw_hash * 37;
1405
1406 return raw_hash % HASH_ROW_SIZE;
1407 }
1408
1409 void initialize_hashtable(LVT_Hash** table) {
1410 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1411 table[i] = NULL;
1412 }
1413 }
1414
1415 void clear_hashtable(LVT_Hash** table) {
1416 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1417 LVT_Hash* current = table[i];
1418 LVT_Hash* next;
1419 while (current != NULL) {
1420 next = current->_next;
1421 current->_next = NULL;
1422 delete(current);
1423 current = next;
1424 }
1425 table[i] = NULL;
1426 }
1427 }
1428
1429 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1430 LVT_Hash* entry = table[index];
1431
1432 /*
1433 * 3-tuple start_bci/length/slot has to be unique key,
1434 * so the following comparison seems to be redundant:
1435 * && elem->name_cp_index == entry->_elem->name_cp_index
1436 */
1437 while (entry != NULL) {
1438 if (elem->start_bci == entry->_elem->start_bci
1439 && elem->length == entry->_elem->length
1440 && elem->name_cp_index == entry->_elem->name_cp_index
1441 && elem->slot == entry->_elem->slot
1442 ) {
1443 return entry;
1444 }
1445 entry = entry->_next;
1446 }
1447 return NULL;
1448 }
1449
1450 // Return false if the local variable is found in table.
1451 // Return true if no duplicate is found.
1452 // And local variable is added as a new entry in table.
1453 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1454 // First lookup for duplicates
1455 int index = hash(elem);
1456 LVT_Hash* entry = LVT_lookup(elem, index, table);
1457
1458 if (entry != NULL) {
1459 return false;
1460 }
1461 // No duplicate is found, allocate a new entry and fill it.
1462 if ((entry = new LVT_Hash()) == NULL) {
1463 return false;
1464 }
1465 entry->_elem = elem;
1466
1467 // Insert into hash table
1468 entry->_next = table[index];
1469 table[index] = entry;
1470
1471 return true;
1472 }
1473
1474 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1475 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1476 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1477 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1478 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1479 lvt->signature_cp_index = 0;
1480 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1481 }
1482
1483 // Function is used to parse both attributes:
1484 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1485 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1486 u2 max_locals,
1487 u4 code_attribute_length,
1488 u2* localvariable_table_length,
1489 bool isLVTT,
1490 TRAPS) {
1491 ClassFileStream* cfs = stream();
1492 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1493 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1494 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1495 // Verify local variable table attribute has right length
1496 if (_need_verify) {
1497 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1498 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1499 }
1500 u2* localvariable_table_start = cfs->get_u2_buffer();
1501 assert(localvariable_table_start != NULL, "null local variable table");
1502 if (!_need_verify) {
1503 cfs->skip_u2_fast(size);
1504 } else {
1505 cfs->guarantee_more(size * 2, CHECK_NULL);
1506 for(int i = 0; i < (*localvariable_table_length); i++) {
1507 u2 start_pc = cfs->get_u2_fast();
1508 u2 length = cfs->get_u2_fast();
1509 u2 name_index = cfs->get_u2_fast();
1510 u2 descriptor_index = cfs->get_u2_fast();
1511 u2 index = cfs->get_u2_fast();
1512 // Assign to a u4 to avoid overflow
1513 u4 end_pc = (u4)start_pc + (u4)length;
1514
1515 if (start_pc >= code_length) {
1516 classfile_parse_error(
1517 "Invalid start_pc %u in %s in class file %s",
1518 start_pc, tbl_name, CHECK_NULL);
1519 }
1520 if (end_pc > code_length) {
1521 classfile_parse_error(
1522 "Invalid length %u in %s in class file %s",
1523 length, tbl_name, CHECK_NULL);
1524 }
1525 int cp_size = _cp->length();
1526 guarantee_property(valid_symbol_at(name_index),
1527 "Name index %u in %s has bad constant type in class file %s",
1528 name_index, tbl_name, CHECK_NULL);
1529 guarantee_property(valid_symbol_at(descriptor_index),
1530 "Signature index %u in %s has bad constant type in class file %s",
1531 descriptor_index, tbl_name, CHECK_NULL);
1532
1533 Symbol* name = _cp->symbol_at(name_index);
1534 Symbol* sig = _cp->symbol_at(descriptor_index);
1535 verify_legal_field_name(name, CHECK_NULL);
1536 u2 extra_slot = 0;
1537 if (!isLVTT) {
1538 verify_legal_field_signature(name, sig, CHECK_NULL);
1539
1540 // 4894874: check special cases for double and long local variables
1541 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1542 sig == vmSymbols::type_signature(T_LONG)) {
1543 extra_slot = 1;
1544 }
1545 }
1546 guarantee_property((index + extra_slot) < max_locals,
1547 "Invalid index %u in %s in class file %s",
1548 index, tbl_name, CHECK_NULL);
1549 }
1550 }
1551 return localvariable_table_start;
1552 }
1553
1554
1555 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1556 u1* u1_array, u2* u2_array, TRAPS) {
1557 ClassFileStream* cfs = stream();
1558 u2 index = 0; // index in the array with long/double occupying two slots
1559 u4 i1 = *u1_index;
1560 u4 i2 = *u2_index + 1;
1561 for(int i = 0; i < array_length; i++) {
1562 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1563 index++;
1564 if (tag == ITEM_Long || tag == ITEM_Double) {
1565 index++;
1566 } else if (tag == ITEM_Object) {
1567 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1568 guarantee_property(valid_klass_reference_at(class_index),
1569 "Bad class index %u in StackMap in class file %s",
1570 class_index, CHECK);
1571 } else if (tag == ITEM_Uninitialized) {
1572 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1573 guarantee_property(
1574 offset < code_length,
1575 "Bad uninitialized type offset %u in StackMap in class file %s",
1576 offset, CHECK);
1577 } else {
1578 guarantee_property(
1579 tag <= (u1)ITEM_Uninitialized,
1580 "Unknown variable type %u in StackMap in class file %s",
1581 tag, CHECK);
1582 }
1583 }
1584 u2_array[*u2_index] = index;
1585 *u1_index = i1;
1586 *u2_index = i2;
1587 }
1588
1589 u1* ClassFileParser::parse_stackmap_table(
1590 u4 code_attribute_length, TRAPS) {
1591 if (code_attribute_length == 0)
1592 return NULL;
1593
1594 ClassFileStream* cfs = stream();
1595 u1* stackmap_table_start = cfs->get_u1_buffer();
1596 assert(stackmap_table_start != NULL, "null stackmap table");
1597
1598 // check code_attribute_length first
1599 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1600
1601 if (!_need_verify && !DumpSharedSpaces) {
1602 return NULL;
1603 }
1604 return stackmap_table_start;
1605 }
1606
1607 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1608 u4 method_attribute_length,
1609 TRAPS) {
1610 ClassFileStream* cfs = stream();
1611 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1612 *checked_exceptions_length = cfs->get_u2_fast();
1613 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1614 u2* checked_exceptions_start = cfs->get_u2_buffer();
1615 assert(checked_exceptions_start != NULL, "null checked exceptions");
1616 if (!_need_verify) {
1617 cfs->skip_u2_fast(size);
1618 } else {
1619 // Verify each value in the checked exception table
1620 u2 checked_exception;
1621 u2 len = *checked_exceptions_length;
1622 cfs->guarantee_more(2 * len, CHECK_NULL);
1623 for (int i = 0; i < len; i++) {
1624 checked_exception = cfs->get_u2_fast();
1625 check_property(
1626 valid_klass_reference_at(checked_exception),
1627 "Exception name has bad type at constant pool %u in class file %s",
1628 checked_exception, CHECK_NULL);
1629 }
1630 }
1631 // check exceptions attribute length
1632 if (_need_verify) {
1633 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1634 sizeof(u2) * size),
1635 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1636 }
1637 return checked_exceptions_start;
1638 }
1639
1640 void ClassFileParser::throwIllegalSignature(
1641 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1642 ResourceMark rm(THREAD);
1643 Exceptions::fthrow(THREAD_AND_LOCATION,
1644 vmSymbols::java_lang_ClassFormatError(),
1645 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1646 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1647 }
1648
1649 // Skip an annotation. Return >=limit if there is any problem.
1650 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1651 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1652 // value := switch (tag:u1) { ... }
1653 index += 2; // skip atype
1654 if ((index += 2) >= limit) return limit; // read nmem
1655 int nmem = Bytes::get_Java_u2(buffer+index-2);
1656 while (--nmem >= 0 && index < limit) {
1657 index += 2; // skip member
1658 index = skip_annotation_value(buffer, limit, index);
1659 }
1660 return index;
1661 }
1662
1663 // Safely increment index by val if does not pass limit
1664 #define SAFE_ADD(index, limit, val) \
1665 if (index >= limit - val) return limit; \
1666 index += val;
1667
1668 // Skip an annotation value. Return >=limit if there is any problem.
1669 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1670 // value := switch (tag:u1) {
1671 // case B, C, I, S, Z, D, F, J, c: con:u2;
1672 // case e: e_class:u2 e_name:u2;
1673 // case s: s_con:u2;
1674 // case [: do(nval:u2) {value};
1675 // case @: annotation;
1676 // case s: s_con:u2;
1677 // }
1678 SAFE_ADD(index, limit, 1); // read tag
1679 u1 tag = buffer[index-1];
1680 switch (tag) {
1681 case 'B': case 'C': case 'I': case 'S': case 'Z':
1682 case 'D': case 'F': case 'J': case 'c': case 's':
1683 SAFE_ADD(index, limit, 2); // skip con or s_con
1684 break;
1685 case 'e':
1686 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1687 break;
1688 case '[':
1689 {
1690 SAFE_ADD(index, limit, 2); // read nval
1691 int nval = Bytes::get_Java_u2(buffer+index-2);
1692 while (--nval >= 0 && index < limit) {
1693 index = skip_annotation_value(buffer, limit, index);
1694 }
1695 }
1696 break;
1697 case '@':
1698 index = skip_annotation(buffer, limit, index);
1699 break;
1700 default:
1701 assert(false, "annotation tag");
1702 return limit; // bad tag byte
1703 }
1704 return index;
1705 }
1706
1707 // Sift through annotations, looking for those significant to the VM:
1708 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1709 ClassFileParser::AnnotationCollector* coll,
1710 TRAPS) {
1711 // annotations := do(nann:u2) {annotation}
1712 int index = 2;
1713 if (index >= limit) return; // read nann
1714 int nann = Bytes::get_Java_u2(buffer+index-2);
1715 enum { // initial annotation layout
1716 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1717 count_off = 2, // u2 such as 1 (one value)
1718 member_off = 4, // utf8 such as 'value'
1719 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1720 e_tag_val = 'e',
1721 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1722 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1723 e_size = 11, // end of 'e' annotation
1724 c_tag_val = 'c', // payload is type
1725 c_con_off = 7, // utf8 payload, such as 'I'
1726 c_size = 9, // end of 'c' annotation
1727 s_tag_val = 's', // payload is String
1728 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1729 s_size = 9,
1730 min_size = 6 // smallest possible size (zero members)
1731 };
1732 // Cannot add min_size to index in case of overflow MAX_INT
1733 while ((--nann) >= 0 && (index-2 <= limit - min_size)) {
1734 int index0 = index;
1735 index = skip_annotation(buffer, limit, index);
1736 u1* abase = buffer + index0;
1737 int atype = Bytes::get_Java_u2(abase + atype_off);
1738 int count = Bytes::get_Java_u2(abase + count_off);
1739 Symbol* aname = check_symbol_at(_cp, atype);
1740 if (aname == NULL) break; // invalid annotation name
1741 Symbol* member = NULL;
1742 if (count >= 1) {
1743 int member_index = Bytes::get_Java_u2(abase + member_off);
1744 member = check_symbol_at(_cp, member_index);
1745 if (member == NULL) break; // invalid member name
1746 }
1747
1748 // Here is where parsing particular annotations will take place.
1749 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1750 if (id == AnnotationCollector::_unknown) continue;
1751 coll->set_annotation(id);
1752
1753 if (id == AnnotationCollector::_sun_misc_Contended) {
1754 // @Contended can optionally specify the contention group.
1755 //
1756 // Contended group defines the equivalence class over the fields:
1757 // the fields within the same contended group are not treated distinct.
1758 // The only exception is default group, which does not incur the
1759 // equivalence. Naturally, contention group for classes is meaningless.
1760 //
1761 // While the contention group is specified as String, annotation
1762 // values are already interned, and we might as well use the constant
1763 // pool index as the group tag.
1764 //
1765 u2 group_index = 0; // default contended group
1766 if (count == 1
1767 && s_size == (index - index0) // match size
1768 && s_tag_val == *(abase + tag_off)
1769 && member == vmSymbols::value_name()) {
1770 group_index = Bytes::get_Java_u2(abase + s_con_off);
1771 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1772 group_index = 0; // default contended group
1773 }
1774 }
1775 coll->set_contended_group(group_index);
1776 }
1777 }
1778 }
1779
1780 ClassFileParser::AnnotationCollector::ID
1781 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1782 Symbol* name) {
1783 vmSymbols::SID sid = vmSymbols::find_sid(name);
1784 // Privileged code can use all annotations. Other code silently drops some.
1785 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1786 loader_data->is_ext_class_loader_data() ||
1787 loader_data->is_anonymous();
1788 switch (sid) {
1789 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1790 if (_location != _in_method) break; // only allow for methods
1791 if (!privileged) break; // only allow in privileged code
1792 return _method_CallerSensitive;
1793 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1794 if (_location != _in_method) break; // only allow for methods
1795 if (!privileged) break; // only allow in privileged code
1796 return _method_ForceInline;
1797 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1798 if (_location != _in_method) break; // only allow for methods
1799 if (!privileged) break; // only allow in privileged code
1800 return _method_DontInline;
1801 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1802 if (_location != _in_method) break; // only allow for methods
1803 if (!privileged) break; // only allow in privileged code
1804 return _method_InjectedProfile;
1805 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1806 if (_location != _in_method) break; // only allow for methods
1807 if (!privileged) break; // only allow in privileged code
1808 return _method_LambdaForm_Compiled;
1809 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1810 if (_location != _in_method) break; // only allow for methods
1811 if (!privileged) break; // only allow in privileged code
1812 return _method_LambdaForm_Hidden;
1813 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1814 if (_location != _in_field) break; // only allow for fields
1815 if (!privileged) break; // only allow in privileged code
1816 return _field_Stable;
1817 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1818 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1819 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1820 return _sun_misc_Contended;
1821 default: break;
1822 }
1823 return AnnotationCollector::_unknown;
1824 }
1825
1826 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1827 if (is_contended())
1828 f->set_contended_group(contended_group());
1829 if (is_stable())
1830 f->set_stable(true);
1831 }
1832
1833 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1834 // If there's an error deallocate metadata for field annotations
1835 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1836 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1837 }
1838
1839 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1840 if (has_annotation(_method_CallerSensitive))
1841 m->set_caller_sensitive(true);
1842 if (has_annotation(_method_ForceInline))
1843 m->set_force_inline(true);
1844 if (has_annotation(_method_DontInline))
1845 m->set_dont_inline(true);
1846 if (has_annotation(_method_InjectedProfile))
1847 m->set_has_injected_profile(true);
1848 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1849 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1850 if (has_annotation(_method_LambdaForm_Hidden))
1851 m->set_hidden(true);
1852 }
1853
1854 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1855 k->set_is_contended(is_contended());
1856 }
1857
1858
1859 #define MAX_ARGS_SIZE 255
1860 #define MAX_CODE_SIZE 65535
1861 #define INITIAL_MAX_LVT_NUMBER 256
1862
1863 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1864 *
1865 * Rules for LVT's and LVTT's are:
1866 * - There can be any number of LVT's and LVTT's.
1867 * - If there are n LVT's, it is the same as if there was just
1868 * one LVT containing all the entries from the n LVT's.
1869 * - There may be no more than one LVT entry per local variable.
1870 * Two LVT entries are 'equal' if these fields are the same:
1871 * start_pc, length, name, slot
1872 * - There may be no more than one LVTT entry per each LVT entry.
1873 * Each LVTT entry has to match some LVT entry.
1874 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1875 */
1876 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1877 int lvt_cnt,
1878 u2* localvariable_table_length,
1879 u2** localvariable_table_start,
1880 int lvtt_cnt,
1881 u2* localvariable_type_table_length,
1882 u2** localvariable_type_table_start,
1883 TRAPS) {
1884
1885 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1886 initialize_hashtable(lvt_Hash);
1887
1888 // To fill LocalVariableTable in
1889 Classfile_LVT_Element* cf_lvt;
1890 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1891
1892 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1893 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1894 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1895 copy_lvt_element(&cf_lvt[idx], lvt);
1896 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1897 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1898 && _need_verify
1899 && _major_version >= JAVA_1_5_VERSION) {
1900 clear_hashtable(lvt_Hash);
1901 classfile_parse_error("Duplicated LocalVariableTable attribute "
1902 "entry for '%s' in class file %s",
1903 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1904 CHECK);
1905 }
1906 }
1907 }
1908
1909 // To merge LocalVariableTable and LocalVariableTypeTable
1910 Classfile_LVT_Element* cf_lvtt;
1911 LocalVariableTableElement lvtt_elem;
1912
1913 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1914 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1915 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1916 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1917 int index = hash(&lvtt_elem);
1918 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1919 if (entry == NULL) {
1920 if (_need_verify) {
1921 clear_hashtable(lvt_Hash);
1922 classfile_parse_error("LVTT entry for '%s' in class file %s "
1923 "does not match any LVT entry",
1924 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1925 CHECK);
1926 }
1927 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1928 clear_hashtable(lvt_Hash);
1929 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1930 "entry for '%s' in class file %s",
1931 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1932 CHECK);
1933 } else {
1934 // to add generic signatures into LocalVariableTable
1935 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1936 }
1937 }
1938 }
1939 clear_hashtable(lvt_Hash);
1940 }
1941
1942
1943 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1944 u1* runtime_visible_annotations,
1945 int runtime_visible_annotations_length,
1946 u1* runtime_invisible_annotations,
1947 int runtime_invisible_annotations_length,
1948 u1* runtime_visible_parameter_annotations,
1949 int runtime_visible_parameter_annotations_length,
1950 u1* runtime_invisible_parameter_annotations,
1951 int runtime_invisible_parameter_annotations_length,
1952 u1* runtime_visible_type_annotations,
1953 int runtime_visible_type_annotations_length,
1954 u1* runtime_invisible_type_annotations,
1955 int runtime_invisible_type_annotations_length,
1956 u1* annotation_default,
1957 int annotation_default_length,
1958 TRAPS) {
1959
1960 AnnotationArray* a;
1961
1962 if (runtime_visible_annotations_length +
1963 runtime_invisible_annotations_length > 0) {
1964 a = assemble_annotations(runtime_visible_annotations,
1965 runtime_visible_annotations_length,
1966 runtime_invisible_annotations,
1967 runtime_invisible_annotations_length,
1968 CHECK);
1969 cm->set_method_annotations(a);
1970 }
1971
1972 if (runtime_visible_parameter_annotations_length +
1973 runtime_invisible_parameter_annotations_length > 0) {
1974 a = assemble_annotations(runtime_visible_parameter_annotations,
1975 runtime_visible_parameter_annotations_length,
1976 runtime_invisible_parameter_annotations,
1977 runtime_invisible_parameter_annotations_length,
1978 CHECK);
1979 cm->set_parameter_annotations(a);
1980 }
1981
1982 if (annotation_default_length > 0) {
1983 a = assemble_annotations(annotation_default,
1984 annotation_default_length,
1985 NULL,
1986 0,
1987 CHECK);
1988 cm->set_default_annotations(a);
1989 }
1990
1991 if (runtime_visible_type_annotations_length +
1992 runtime_invisible_type_annotations_length > 0) {
1993 a = assemble_annotations(runtime_visible_type_annotations,
1994 runtime_visible_type_annotations_length,
1995 runtime_invisible_type_annotations,
1996 runtime_invisible_type_annotations_length,
1997 CHECK);
1998 cm->set_type_annotations(a);
1999 }
2000 }
2001
2002
2003 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2004 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2005 // Method* to save footprint, so we only know the size of the resulting Method* when the
2006 // entire method attribute is parsed.
2007 //
2008 // The promoted_flags parameter is used to pass relevant access_flags
2009 // from the method back up to the containing klass. These flag values
2010 // are added to klass's access_flags.
2011
2012 methodHandle ClassFileParser::parse_method(bool is_interface,
2013 AccessFlags *promoted_flags,
2014 TRAPS) {
2015 ClassFileStream* cfs = stream();
2016 methodHandle nullHandle;
2017 ResourceMark rm(THREAD);
2018 // Parse fixed parts
2019 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
2020
2021 int flags = cfs->get_u2_fast();
2022 u2 name_index = cfs->get_u2_fast();
2023 int cp_size = _cp->length();
2024 check_property(
2025 valid_symbol_at(name_index),
2026 "Illegal constant pool index %u for method name in class file %s",
2027 name_index, CHECK_(nullHandle));
2028 Symbol* name = _cp->symbol_at(name_index);
2029 verify_legal_method_name(name, CHECK_(nullHandle));
2030
2031 u2 signature_index = cfs->get_u2_fast();
2032 guarantee_property(
2033 valid_symbol_at(signature_index),
2034 "Illegal constant pool index %u for method signature in class file %s",
2035 signature_index, CHECK_(nullHandle));
2036 Symbol* signature = _cp->symbol_at(signature_index);
2037
2038 AccessFlags access_flags;
2039 if (name == vmSymbols::class_initializer_name()) {
2040 // We ignore the other access flags for a valid class initializer.
2041 // (JVM Spec 2nd ed., chapter 4.6)
2042 if (_major_version < 51) { // backward compatibility
2043 flags = JVM_ACC_STATIC;
2044 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2045 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2046 }
2047 } else {
2048 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2049 }
2050
2051 int args_size = -1; // only used when _need_verify is true
2052 if (_need_verify) {
2053 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2054 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2055 if (args_size > MAX_ARGS_SIZE) {
2056 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2057 }
2058 }
2059
2060 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2061
2062 // Default values for code and exceptions attribute elements
2063 u2 max_stack = 0;
2064 u2 max_locals = 0;
2065 u4 code_length = 0;
2066 u1* code_start = 0;
2067 u2 exception_table_length = 0;
2068 u2* exception_table_start = NULL;
2069 Array<int>* exception_handlers = Universe::the_empty_int_array();
2070 u2 checked_exceptions_length = 0;
2071 u2* checked_exceptions_start = NULL;
2072 CompressedLineNumberWriteStream* linenumber_table = NULL;
2073 int linenumber_table_length = 0;
2074 int total_lvt_length = 0;
2075 u2 lvt_cnt = 0;
2076 u2 lvtt_cnt = 0;
2077 bool lvt_allocated = false;
2078 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2079 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2080 u2* localvariable_table_length;
2081 u2** localvariable_table_start;
2082 u2* localvariable_type_table_length;
2083 u2** localvariable_type_table_start;
2084 u2 method_parameters_length = 0;
2085 u1* method_parameters_data = NULL;
2086 bool method_parameters_seen = false;
2087 bool parsed_code_attribute = false;
2088 bool parsed_checked_exceptions_attribute = false;
2089 bool parsed_stackmap_attribute = false;
2090 // stackmap attribute - JDK1.5
2091 u1* stackmap_data = NULL;
2092 int stackmap_data_length = 0;
2093 u2 generic_signature_index = 0;
2094 MethodAnnotationCollector parsed_annotations;
2095 u1* runtime_visible_annotations = NULL;
2096 int runtime_visible_annotations_length = 0;
2097 u1* runtime_invisible_annotations = NULL;
2098 int runtime_invisible_annotations_length = 0;
2099 u1* runtime_visible_parameter_annotations = NULL;
2100 int runtime_visible_parameter_annotations_length = 0;
2101 u1* runtime_invisible_parameter_annotations = NULL;
2102 int runtime_invisible_parameter_annotations_length = 0;
2103 u1* runtime_visible_type_annotations = NULL;
2104 int runtime_visible_type_annotations_length = 0;
2105 u1* runtime_invisible_type_annotations = NULL;
2106 int runtime_invisible_type_annotations_length = 0;
2107 bool runtime_invisible_type_annotations_exists = false;
2108 u1* annotation_default = NULL;
2109 int annotation_default_length = 0;
2110
2111 // Parse code and exceptions attribute
2112 u2 method_attributes_count = cfs->get_u2_fast();
2113 while (method_attributes_count--) {
2114 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2115 u2 method_attribute_name_index = cfs->get_u2_fast();
2116 u4 method_attribute_length = cfs->get_u4_fast();
2117 check_property(
2118 valid_symbol_at(method_attribute_name_index),
2119 "Invalid method attribute name index %u in class file %s",
2120 method_attribute_name_index, CHECK_(nullHandle));
2121
2122 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2123 if (method_attribute_name == vmSymbols::tag_code()) {
2124 // Parse Code attribute
2125 if (_need_verify) {
2126 guarantee_property(
2127 !access_flags.is_native() && !access_flags.is_abstract(),
2128 "Code attribute in native or abstract methods in class file %s",
2129 CHECK_(nullHandle));
2130 }
2131 if (parsed_code_attribute) {
2132 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2133 }
2134 parsed_code_attribute = true;
2135
2136 // Stack size, locals size, and code size
2137 if (_major_version == 45 && _minor_version <= 2) {
2138 cfs->guarantee_more(4, CHECK_(nullHandle));
2139 max_stack = cfs->get_u1_fast();
2140 max_locals = cfs->get_u1_fast();
2141 code_length = cfs->get_u2_fast();
2142 } else {
2143 cfs->guarantee_more(8, CHECK_(nullHandle));
2144 max_stack = cfs->get_u2_fast();
2145 max_locals = cfs->get_u2_fast();
2146 code_length = cfs->get_u4_fast();
2147 }
2148 if (_need_verify) {
2149 guarantee_property(args_size <= max_locals,
2150 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2151 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2152 "Invalid method Code length %u in class file %s",
2153 code_length, CHECK_(nullHandle));
2154 }
2155 // Code pointer
2156 code_start = cfs->get_u1_buffer();
2157 assert(code_start != NULL, "null code start");
2158 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2159 cfs->skip_u1_fast(code_length);
2160
2161 // Exception handler table
2162 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2163 exception_table_length = cfs->get_u2_fast();
2164 if (exception_table_length > 0) {
2165 exception_table_start =
2166 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2167 }
2168
2169 // Parse additional attributes in code attribute
2170 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2171 u2 code_attributes_count = cfs->get_u2_fast();
2172
2173 unsigned int calculated_attribute_length = 0;
2174
2175 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2176 calculated_attribute_length =
2177 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2178 } else {
2179 // max_stack, locals and length are smaller in pre-version 45.2 classes
2180 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2181 }
2182 calculated_attribute_length +=
2183 code_length +
2184 sizeof(exception_table_length) +
2185 sizeof(code_attributes_count) +
2186 exception_table_length *
2187 ( sizeof(u2) + // start_pc
2188 sizeof(u2) + // end_pc
2189 sizeof(u2) + // handler_pc
2190 sizeof(u2) ); // catch_type_index
2191
2192 while (code_attributes_count--) {
2193 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2194 u2 code_attribute_name_index = cfs->get_u2_fast();
2195 u4 code_attribute_length = cfs->get_u4_fast();
2196 calculated_attribute_length += code_attribute_length +
2197 sizeof(code_attribute_name_index) +
2198 sizeof(code_attribute_length);
2199 check_property(valid_symbol_at(code_attribute_name_index),
2200 "Invalid code attribute name index %u in class file %s",
2201 code_attribute_name_index,
2202 CHECK_(nullHandle));
2203 if (LoadLineNumberTables &&
2204 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2205 // Parse and compress line number table
2206 parse_linenumber_table(code_attribute_length, code_length,
2207 &linenumber_table, CHECK_(nullHandle));
2208
2209 } else if (LoadLocalVariableTables &&
2210 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2211 // Parse local variable table
2212 if (!lvt_allocated) {
2213 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2214 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2215 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2216 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2217 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2218 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2219 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2220 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2221 lvt_allocated = true;
2222 }
2223 if (lvt_cnt == max_lvt_cnt) {
2224 max_lvt_cnt <<= 1;
2225 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2226 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2227 }
2228 localvariable_table_start[lvt_cnt] =
2229 parse_localvariable_table(code_length,
2230 max_locals,
2231 code_attribute_length,
2232 &localvariable_table_length[lvt_cnt],
2233 false, // is not LVTT
2234 CHECK_(nullHandle));
2235 total_lvt_length += localvariable_table_length[lvt_cnt];
2236 lvt_cnt++;
2237 } else if (LoadLocalVariableTypeTables &&
2238 _major_version >= JAVA_1_5_VERSION &&
2239 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2240 if (!lvt_allocated) {
2241 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2242 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2243 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2244 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2245 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2246 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2247 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2248 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2249 lvt_allocated = true;
2250 }
2251 // Parse local variable type table
2252 if (lvtt_cnt == max_lvtt_cnt) {
2253 max_lvtt_cnt <<= 1;
2254 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2255 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2256 }
2257 localvariable_type_table_start[lvtt_cnt] =
2258 parse_localvariable_table(code_length,
2259 max_locals,
2260 code_attribute_length,
2261 &localvariable_type_table_length[lvtt_cnt],
2262 true, // is LVTT
2263 CHECK_(nullHandle));
2264 lvtt_cnt++;
2265 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2266 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2267 // Stack map is only needed by the new verifier in JDK1.5.
2268 if (parsed_stackmap_attribute) {
2269 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2270 }
2271 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2272 stackmap_data_length = code_attribute_length;
2273 parsed_stackmap_attribute = true;
2274 } else {
2275 // Skip unknown attributes
2276 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2277 }
2278 }
2279 // check method attribute length
2280 if (_need_verify) {
2281 guarantee_property(method_attribute_length == calculated_attribute_length,
2282 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2283 }
2284 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2285 // Parse Exceptions attribute
2286 if (parsed_checked_exceptions_attribute) {
2287 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2288 }
2289 parsed_checked_exceptions_attribute = true;
2290 checked_exceptions_start =
2291 parse_checked_exceptions(&checked_exceptions_length,
2292 method_attribute_length,
2293 CHECK_(nullHandle));
2294 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2295 // reject multiple method parameters
2296 if (method_parameters_seen) {
2297 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2298 }
2299 method_parameters_seen = true;
2300 method_parameters_length = cfs->get_u1_fast();
2301 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2302 classfile_parse_error(
2303 "Invalid MethodParameters method attribute length %u in class file",
2304 method_attribute_length, CHECK_(nullHandle));
2305 }
2306 method_parameters_data = cfs->get_u1_buffer();
2307 cfs->skip_u2_fast(method_parameters_length);
2308 cfs->skip_u2_fast(method_parameters_length);
2309 // ignore this attribute if it cannot be reflected
2310 if (!SystemDictionary::Parameter_klass_loaded())
2311 method_parameters_length = 0;
2312 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2313 if (method_attribute_length != 0) {
2314 classfile_parse_error(
2315 "Invalid Synthetic method attribute length %u in class file %s",
2316 method_attribute_length, CHECK_(nullHandle));
2317 }
2318 // Should we check that there hasn't already been a synthetic attribute?
2319 access_flags.set_is_synthetic();
2320 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2321 if (method_attribute_length != 0) {
2322 classfile_parse_error(
2323 "Invalid Deprecated method attribute length %u in class file %s",
2324 method_attribute_length, CHECK_(nullHandle));
2325 }
2326 } else if (_major_version >= JAVA_1_5_VERSION) {
2327 if (method_attribute_name == vmSymbols::tag_signature()) {
2328 if (method_attribute_length != 2) {
2329 classfile_parse_error(
2330 "Invalid Signature attribute length %u in class file %s",
2331 method_attribute_length, CHECK_(nullHandle));
2332 }
2333 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2334 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2335 runtime_visible_annotations_length = method_attribute_length;
2336 runtime_visible_annotations = cfs->get_u1_buffer();
2337 assert(runtime_visible_annotations != NULL, "null visible annotations");
2338 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_(nullHandle));
2339 parse_annotations(runtime_visible_annotations,
2340 runtime_visible_annotations_length, &parsed_annotations,
2341 CHECK_(nullHandle));
2342 cfs->skip_u1_fast(runtime_visible_annotations_length);
2343 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2344 runtime_invisible_annotations_length = method_attribute_length;
2345 runtime_invisible_annotations = cfs->get_u1_buffer();
2346 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2347 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2348 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2349 runtime_visible_parameter_annotations_length = method_attribute_length;
2350 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2351 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2352 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2353 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2354 runtime_invisible_parameter_annotations_length = method_attribute_length;
2355 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2356 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2357 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2358 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2359 annotation_default_length = method_attribute_length;
2360 annotation_default = cfs->get_u1_buffer();
2361 assert(annotation_default != NULL, "null annotation default");
2362 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2363 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2364 if (runtime_visible_type_annotations != NULL) {
2365 classfile_parse_error(
2366 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2367 CHECK_(nullHandle));
2368 }
2369 runtime_visible_type_annotations_length = method_attribute_length;
2370 runtime_visible_type_annotations = cfs->get_u1_buffer();
2371 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2372 // No need for the VM to parse Type annotations
2373 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2374 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2375 if (runtime_invisible_type_annotations_exists) {
2376 classfile_parse_error(
2377 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2378 CHECK_(nullHandle));
2379 } else {
2380 runtime_invisible_type_annotations_exists = true;
2381 }
2382 if (PreserveAllAnnotations) {
2383 runtime_invisible_type_annotations_length = method_attribute_length;
2384 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2385 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2386 }
2387 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2388 } else {
2389 // Skip unknown attributes
2390 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2391 }
2392 } else {
2393 // Skip unknown attributes
2394 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2395 }
2396 }
2397
2398 if (linenumber_table != NULL) {
2399 linenumber_table->write_terminator();
2400 linenumber_table_length = linenumber_table->position();
2401 }
2402
2403 // Make sure there's at least one Code attribute in non-native/non-abstract method
2404 if (_need_verify) {
2405 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2406 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2407 }
2408
2409 // All sizing information for a Method* is finally available, now create it
2410 InlineTableSizes sizes(
2411 total_lvt_length,
2412 linenumber_table_length,
2413 exception_table_length,
2414 checked_exceptions_length,
2415 method_parameters_length,
2416 generic_signature_index,
2417 runtime_visible_annotations_length +
2418 runtime_invisible_annotations_length,
2419 runtime_visible_parameter_annotations_length +
2420 runtime_invisible_parameter_annotations_length,
2421 runtime_visible_type_annotations_length +
2422 runtime_invisible_type_annotations_length,
2423 annotation_default_length,
2424 0);
2425
2426 Method* m = Method::allocate(
2427 _loader_data, code_length, access_flags, &sizes,
2428 ConstMethod::NORMAL, CHECK_(nullHandle));
2429
2430 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2431
2432 // Fill in information from fixed part (access_flags already set)
2433 m->set_constants(_cp);
2434 m->set_name_index(name_index);
2435 m->set_signature_index(signature_index);
2436
2437 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2438 m->constMethod()->set_result_type(rtf.type());
2439
2440 if (args_size >= 0) {
2441 m->set_size_of_parameters(args_size);
2442 } else {
2443 m->compute_size_of_parameters(THREAD);
2444 }
2445 #ifdef ASSERT
2446 if (args_size >= 0) {
2447 m->compute_size_of_parameters(THREAD);
2448 assert(args_size == m->size_of_parameters(), "");
2449 }
2450 #endif
2451
2452 // Fill in code attribute information
2453 m->set_max_stack(max_stack);
2454 m->set_max_locals(max_locals);
2455 if (stackmap_data != NULL) {
2456 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2457 stackmap_data_length, CHECK_NULL);
2458 }
2459
2460 // Copy byte codes
2461 m->set_code(code_start);
2462
2463 // Copy line number table
2464 if (linenumber_table != NULL) {
2465 memcpy(m->compressed_linenumber_table(),
2466 linenumber_table->buffer(), linenumber_table_length);
2467 }
2468
2469 // Copy exception table
2470 if (exception_table_length > 0) {
2471 int size =
2472 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2473 copy_u2_with_conversion((u2*) m->exception_table_start(),
2474 exception_table_start, size);
2475 }
2476
2477 // Copy method parameters
2478 if (method_parameters_length > 0) {
2479 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2480 for (int i = 0; i < method_parameters_length; i++) {
2481 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2482 method_parameters_data += 2;
2483 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2484 method_parameters_data += 2;
2485 }
2486 }
2487
2488 // Copy checked exceptions
2489 if (checked_exceptions_length > 0) {
2490 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2491 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2492 }
2493
2494 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2495 if (total_lvt_length > 0) {
2496 promoted_flags->set_has_localvariable_table();
2497 copy_localvariable_table(m->constMethod(), lvt_cnt,
2498 localvariable_table_length,
2499 localvariable_table_start,
2500 lvtt_cnt,
2501 localvariable_type_table_length,
2502 localvariable_type_table_start, CHECK_NULL);
2503 }
2504
2505 if (parsed_annotations.has_any_annotations())
2506 parsed_annotations.apply_to(m);
2507
2508 // Copy annotations
2509 copy_method_annotations(m->constMethod(),
2510 runtime_visible_annotations,
2511 runtime_visible_annotations_length,
2512 runtime_invisible_annotations,
2513 runtime_invisible_annotations_length,
2514 runtime_visible_parameter_annotations,
2515 runtime_visible_parameter_annotations_length,
2516 runtime_invisible_parameter_annotations,
2517 runtime_invisible_parameter_annotations_length,
2518 runtime_visible_type_annotations,
2519 runtime_visible_type_annotations_length,
2520 runtime_invisible_type_annotations,
2521 runtime_invisible_type_annotations_length,
2522 annotation_default,
2523 annotation_default_length,
2524 CHECK_NULL);
2525
2526 if (name == vmSymbols::finalize_method_name() &&
2527 signature == vmSymbols::void_method_signature()) {
2528 if (m->is_empty_method()) {
2529 _has_empty_finalizer = true;
2530 } else {
2531 _has_finalizer = true;
2532 }
2533 }
2534 if (name == vmSymbols::object_initializer_name() &&
2535 signature == vmSymbols::void_method_signature() &&
2536 m->is_vanilla_constructor()) {
2537 _has_vanilla_constructor = true;
2538 }
2539
2540 NOT_PRODUCT(m->verify());
2541 return m;
2542 }
2543
2544
2545 // The promoted_flags parameter is used to pass relevant access_flags
2546 // from the methods back up to the containing klass. These flag values
2547 // are added to klass's access_flags.
2548
2549 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2550 AccessFlags* promoted_flags,
2551 bool* has_final_method,
2552 bool* declares_default_methods,
2553 TRAPS) {
2554 ClassFileStream* cfs = stream();
2555 cfs->guarantee_more(2, CHECK_NULL); // length
2556 u2 length = cfs->get_u2_fast();
2557 if (length == 0) {
2558 _methods = Universe::the_empty_method_array();
2559 } else {
2560 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2561
2562 HandleMark hm(THREAD);
2563 for (int index = 0; index < length; index++) {
2564 methodHandle method = parse_method(is_interface,
2565 promoted_flags,
2566 CHECK_NULL);
2567
2568 if (method->is_final()) {
2569 *has_final_method = true;
2570 }
2571 // declares_default_methods: declares concrete instance methods, any access flags
2572 // used for interface initialization, and default method inheritance analysis
2573 if (is_interface && !(*declares_default_methods)
2574 && !method->is_abstract() && !method->is_static()) {
2575 *declares_default_methods = true;
2576 }
2577 _methods->at_put(index, method());
2578 }
2579
2580 if (_need_verify && length > 1) {
2581 // Check duplicated methods
2582 ResourceMark rm(THREAD);
2583 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2584 THREAD, NameSigHash*, HASH_ROW_SIZE);
2585 initialize_hashtable(names_and_sigs);
2586 bool dup = false;
2587 Symbol* name = NULL;
2588 Symbol* sig = NULL;
2589 {
2590 debug_only(No_Safepoint_Verifier nsv;)
2591 for (int i = 0; i < length; i++) {
2592 Method* m = _methods->at(i);
2593 name = m->name();
2594 sig = m->signature();
2595 // If no duplicates, add name/signature in hashtable names_and_sigs.
2596 if (!put_after_lookup(name, sig, names_and_sigs)) {
2597 dup = true;
2598 break;
2599 }
2600 }
2601 }
2602 if (dup) {
2603 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2604 name->as_C_string(), sig->as_klass_external_name(), CHECK_NULL);
2605 }
2606 }
2607 }
2608 return _methods;
2609 }
2610
2611
2612 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2613 int length = methods->length();
2614 // If JVMTI original method ordering or sharing is enabled we have to
2615 // remember the original class file ordering.
2616 // We temporarily use the vtable_index field in the Method* to store the
2617 // class file index, so we can read in after calling qsort.
2618 // Put the method ordering in the shared archive.
2619 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2620 for (int index = 0; index < length; index++) {
2621 Method* m = methods->at(index);
2622 assert(!m->valid_vtable_index(), "vtable index should not be set");
2623 m->set_vtable_index(index);
2624 }
2625 }
2626 // Sort method array by ascending method name (for faster lookups & vtable construction)
2627 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2628 Method::sort_methods(methods);
2629
2630 intArray* method_ordering = NULL;
2631 // If JVMTI original method ordering or sharing is enabled construct int
2632 // array remembering the original ordering
2633 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2634 method_ordering = new intArray(length);
2635 for (int index = 0; index < length; index++) {
2636 Method* m = methods->at(index);
2637 int old_index = m->vtable_index();
2638 assert(old_index >= 0 && old_index < length, "invalid method index");
2639 method_ordering->at_put(index, old_index);
2640 m->set_vtable_index(Method::invalid_vtable_index);
2641 }
2642 }
2643 return method_ordering;
2644 }
2645
2646 // Parse generic_signature attribute for methods and fields
2647 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2648 ClassFileStream* cfs = stream();
2649 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2650 u2 generic_signature_index = cfs->get_u2_fast();
2651 check_property(
2652 valid_symbol_at(generic_signature_index),
2653 "Invalid Signature attribute at constant pool index %u in class file %s",
2654 generic_signature_index, CHECK_0);
2655 return generic_signature_index;
2656 }
2657
2658 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2659 ClassFileStream* cfs = stream();
2660 cfs->guarantee_more(2, CHECK); // sourcefile_index
2661 u2 sourcefile_index = cfs->get_u2_fast();
2662 check_property(
2663 valid_symbol_at(sourcefile_index),
2664 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2665 sourcefile_index, CHECK);
2666 set_class_sourcefile_index(sourcefile_index);
2667 }
2668
2669
2670
2671 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2672 ClassFileStream* cfs = stream();
2673 u1* sde_buffer = cfs->get_u1_buffer();
2674 assert(sde_buffer != NULL, "null sde buffer");
2675
2676 // Don't bother storing it if there is no way to retrieve it
2677 if (JvmtiExport::can_get_source_debug_extension()) {
2678 assert((length+1) > length, "Overflow checking");
2679 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2680 for (int i = 0; i < length; i++) {
2681 sde[i] = sde_buffer[i];
2682 }
2683 sde[length] = '\0';
2684 set_class_sde_buffer((char*)sde, length);
2685 }
2686 // Got utf8 string, set stream position forward
2687 cfs->skip_u1(length, CHECK);
2688 }
2689
2690
2691 // Inner classes can be static, private or protected (classic VM does this)
2692 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2693
2694 // Return number of classes in the inner classes attribute table
2695 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2696 bool parsed_enclosingmethod_attribute,
2697 u2 enclosing_method_class_index,
2698 u2 enclosing_method_method_index,
2699 TRAPS) {
2700 ClassFileStream* cfs = stream();
2701 u1* current_mark = cfs->current();
2702 u2 length = 0;
2703 if (inner_classes_attribute_start != NULL) {
2704 cfs->set_current(inner_classes_attribute_start);
2705 cfs->guarantee_more(2, CHECK_0); // length
2706 length = cfs->get_u2_fast();
2707 }
2708
2709 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2710 // method data:
2711 // [inner_class_info_index,
2712 // outer_class_info_index,
2713 // inner_name_index,
2714 // inner_class_access_flags,
2715 // ...
2716 // enclosing_method_class_index,
2717 // enclosing_method_method_index]
2718 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2719 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2720 _inner_classes = inner_classes;
2721
2722 int index = 0;
2723 int cp_size = _cp->length();
2724 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2725 for (int n = 0; n < length; n++) {
2726 // Inner class index
2727 u2 inner_class_info_index = cfs->get_u2_fast();
2728 check_property(
2729 inner_class_info_index == 0 ||
2730 valid_klass_reference_at(inner_class_info_index),
2731 "inner_class_info_index %u has bad constant type in class file %s",
2732 inner_class_info_index, CHECK_0);
2733 // Outer class index
2734 u2 outer_class_info_index = cfs->get_u2_fast();
2735 check_property(
2736 outer_class_info_index == 0 ||
2737 valid_klass_reference_at(outer_class_info_index),
2738 "outer_class_info_index %u has bad constant type in class file %s",
2739 outer_class_info_index, CHECK_0);
2740 // Inner class name
2741 u2 inner_name_index = cfs->get_u2_fast();
2742 check_property(
2743 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2744 "inner_name_index %u has bad constant type in class file %s",
2745 inner_name_index, CHECK_0);
2746 if (_need_verify) {
2747 guarantee_property(inner_class_info_index != outer_class_info_index,
2748 "Class is both outer and inner class in class file %s", CHECK_0);
2749 }
2750 // Access flags
2751 AccessFlags inner_access_flags;
2752 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2753 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2754 // Set abstract bit for old class files for backward compatibility
2755 flags |= JVM_ACC_ABSTRACT;
2756 }
2757 verify_legal_class_modifiers(flags, CHECK_0);
2758 inner_access_flags.set_flags(flags);
2759
2760 inner_classes->at_put(index++, inner_class_info_index);
2761 inner_classes->at_put(index++, outer_class_info_index);
2762 inner_classes->at_put(index++, inner_name_index);
2763 inner_classes->at_put(index++, inner_access_flags.as_short());
2764 }
2765
2766 // 4347400: make sure there's no duplicate entry in the classes array
2767 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2768 for(int i = 0; i < length * 4; i += 4) {
2769 for(int j = i + 4; j < length * 4; j += 4) {
2770 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2771 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2772 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2773 inner_classes->at(i+3) != inner_classes->at(j+3)),
2774 "Duplicate entry in InnerClasses in class file %s",
2775 CHECK_0);
2776 }
2777 }
2778 }
2779
2780 // Set EnclosingMethod class and method indexes.
2781 if (parsed_enclosingmethod_attribute) {
2782 inner_classes->at_put(index++, enclosing_method_class_index);
2783 inner_classes->at_put(index++, enclosing_method_method_index);
2784 }
2785 assert(index == size, "wrong size");
2786
2787 // Restore buffer's current position.
2788 cfs->set_current(current_mark);
2789
2790 return length;
2791 }
2792
2793 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2794 set_class_synthetic_flag(true);
2795 }
2796
2797 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2798 ClassFileStream* cfs = stream();
2799 u2 signature_index = cfs->get_u2(CHECK);
2800 check_property(
2801 valid_symbol_at(signature_index),
2802 "Invalid constant pool index %u in Signature attribute in class file %s",
2803 signature_index, CHECK);
2804 set_class_generic_signature_index(signature_index);
2805 }
2806
2807 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2808 ClassFileStream* cfs = stream();
2809 u1* current_start = cfs->current();
2810
2811 guarantee_property(attribute_byte_length >= sizeof(u2),
2812 "Invalid BootstrapMethods attribute length %u in class file %s",
2813 attribute_byte_length,
2814 CHECK);
2815
2816 cfs->guarantee_more(attribute_byte_length, CHECK);
2817
2818 int attribute_array_length = cfs->get_u2_fast();
2819
2820 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2821 "Short length on BootstrapMethods in class file %s",
2822 CHECK);
2823
2824 // The attribute contains a counted array of counted tuples of shorts,
2825 // represending bootstrap specifiers:
2826 // length*{bootstrap_method_index, argument_count*{argument_index}}
2827 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2828 // operand_count = number of shorts in attr, except for leading length
2829
2830 // The attribute is copied into a short[] array.
2831 // The array begins with a series of short[2] pairs, one for each tuple.
2832 int index_size = (attribute_array_length * 2);
2833
2834 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2835
2836 // Eagerly assign operands so they will be deallocated with the constant
2837 // pool if there is an error.
2838 _cp->set_operands(operands);
2839
2840 int operand_fill_index = index_size;
2841 int cp_size = _cp->length();
2842
2843 for (int n = 0; n < attribute_array_length; n++) {
2844 // Store a 32-bit offset into the header of the operand array.
2845 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2846
2847 // Read a bootstrap specifier.
2848 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2849 u2 bootstrap_method_index = cfs->get_u2_fast();
2850 u2 argument_count = cfs->get_u2_fast();
2851 check_property(
2852 valid_cp_range(bootstrap_method_index, cp_size) &&
2853 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2854 "bootstrap_method_index %u has bad constant type in class file %s",
2855 bootstrap_method_index,
2856 CHECK);
2857
2858 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2859 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2860 CHECK);
2861
2862 operands->at_put(operand_fill_index++, bootstrap_method_index);
2863 operands->at_put(operand_fill_index++, argument_count);
2864
2865 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2866 for (int j = 0; j < argument_count; j++) {
2867 u2 argument_index = cfs->get_u2_fast();
2868 check_property(
2869 valid_cp_range(argument_index, cp_size) &&
2870 _cp->tag_at(argument_index).is_loadable_constant(),
2871 "argument_index %u has bad constant type in class file %s",
2872 argument_index,
2873 CHECK);
2874 operands->at_put(operand_fill_index++, argument_index);
2875 }
2876 }
2877
2878 assert(operand_fill_index == operands->length(), "exact fill");
2879
2880 u1* current_end = cfs->current();
2881 guarantee_property(current_end == current_start + attribute_byte_length,
2882 "Bad length on BootstrapMethods in class file %s",
2883 CHECK);
2884 }
2885
2886 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2887 TRAPS) {
2888 ClassFileStream* cfs = stream();
2889 // Set inner classes attribute to default sentinel
2890 _inner_classes = Universe::the_empty_short_array();
2891 cfs->guarantee_more(2, CHECK); // attributes_count
2892 u2 attributes_count = cfs->get_u2_fast();
2893 bool parsed_sourcefile_attribute = false;
2894 bool parsed_innerclasses_attribute = false;
2895 bool parsed_enclosingmethod_attribute = false;
2896 bool parsed_bootstrap_methods_attribute = false;
2897 u1* runtime_visible_annotations = NULL;
2898 int runtime_visible_annotations_length = 0;
2899 u1* runtime_invisible_annotations = NULL;
2900 int runtime_invisible_annotations_length = 0;
2901 u1* runtime_visible_type_annotations = NULL;
2902 int runtime_visible_type_annotations_length = 0;
2903 u1* runtime_invisible_type_annotations = NULL;
2904 int runtime_invisible_type_annotations_length = 0;
2905 bool runtime_invisible_type_annotations_exists = false;
2906 u1* inner_classes_attribute_start = NULL;
2907 u4 inner_classes_attribute_length = 0;
2908 u2 enclosing_method_class_index = 0;
2909 u2 enclosing_method_method_index = 0;
2910 // Iterate over attributes
2911 while (attributes_count--) {
2912 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2913 u2 attribute_name_index = cfs->get_u2_fast();
2914 u4 attribute_length = cfs->get_u4_fast();
2915 check_property(
2916 valid_symbol_at(attribute_name_index),
2917 "Attribute name has bad constant pool index %u in class file %s",
2918 attribute_name_index, CHECK);
2919 Symbol* tag = _cp->symbol_at(attribute_name_index);
2920 if (tag == vmSymbols::tag_source_file()) {
2921 // Check for SourceFile tag
2922 if (_need_verify) {
2923 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2924 }
2925 if (parsed_sourcefile_attribute) {
2926 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2927 } else {
2928 parsed_sourcefile_attribute = true;
2929 }
2930 parse_classfile_sourcefile_attribute(CHECK);
2931 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2932 // Check for SourceDebugExtension tag
2933 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2934 } else if (tag == vmSymbols::tag_inner_classes()) {
2935 // Check for InnerClasses tag
2936 if (parsed_innerclasses_attribute) {
2937 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2938 } else {
2939 parsed_innerclasses_attribute = true;
2940 }
2941 inner_classes_attribute_start = cfs->get_u1_buffer();
2942 inner_classes_attribute_length = attribute_length;
2943 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2944 } else if (tag == vmSymbols::tag_synthetic()) {
2945 // Check for Synthetic tag
2946 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2947 if (attribute_length != 0) {
2948 classfile_parse_error(
2949 "Invalid Synthetic classfile attribute length %u in class file %s",
2950 attribute_length, CHECK);
2951 }
2952 parse_classfile_synthetic_attribute(CHECK);
2953 } else if (tag == vmSymbols::tag_deprecated()) {
2954 // Check for Deprecatd tag - 4276120
2955 if (attribute_length != 0) {
2956 classfile_parse_error(
2957 "Invalid Deprecated classfile attribute length %u in class file %s",
2958 attribute_length, CHECK);
2959 }
2960 } else if (_major_version >= JAVA_1_5_VERSION) {
2961 if (tag == vmSymbols::tag_signature()) {
2962 if (attribute_length != 2) {
2963 classfile_parse_error(
2964 "Wrong Signature attribute length %u in class file %s",
2965 attribute_length, CHECK);
2966 }
2967 parse_classfile_signature_attribute(CHECK);
2968 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2969 runtime_visible_annotations_length = attribute_length;
2970 runtime_visible_annotations = cfs->get_u1_buffer();
2971 assert(runtime_visible_annotations != NULL, "null visible annotations");
2972 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
2973 parse_annotations(runtime_visible_annotations,
2974 runtime_visible_annotations_length,
2975 parsed_annotations,
2976 CHECK);
2977 cfs->skip_u1_fast(runtime_visible_annotations_length);
2978 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2979 runtime_invisible_annotations_length = attribute_length;
2980 runtime_invisible_annotations = cfs->get_u1_buffer();
2981 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2982 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2983 } else if (tag == vmSymbols::tag_enclosing_method()) {
2984 if (parsed_enclosingmethod_attribute) {
2985 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2986 } else {
2987 parsed_enclosingmethod_attribute = true;
2988 }
2989 cfs->guarantee_more(4, CHECK); // class_index, method_index
2990 enclosing_method_class_index = cfs->get_u2_fast();
2991 enclosing_method_method_index = cfs->get_u2_fast();
2992 if (enclosing_method_class_index == 0) {
2993 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2994 }
2995 // Validate the constant pool indices and types
2996 check_property(valid_klass_reference_at(enclosing_method_class_index),
2997 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2998 if (enclosing_method_method_index != 0 &&
2999 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3000 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3001 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3002 }
3003 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3004 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3005 if (parsed_bootstrap_methods_attribute)
3006 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3007 parsed_bootstrap_methods_attribute = true;
3008 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3009 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3010 if (runtime_visible_type_annotations != NULL) {
3011 classfile_parse_error(
3012 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3013 }
3014 runtime_visible_type_annotations_length = attribute_length;
3015 runtime_visible_type_annotations = cfs->get_u1_buffer();
3016 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3017 // No need for the VM to parse Type annotations
3018 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3019 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3020 if (runtime_invisible_type_annotations_exists) {
3021 classfile_parse_error(
3022 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3023 } else {
3024 runtime_invisible_type_annotations_exists = true;
3025 }
3026 if (PreserveAllAnnotations) {
3027 runtime_invisible_type_annotations_length = attribute_length;
3028 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3029 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3030 }
3031 cfs->skip_u1(attribute_length, CHECK);
3032 } else {
3033 // Unknown attribute
3034 cfs->skip_u1(attribute_length, CHECK);
3035 }
3036 } else {
3037 // Unknown attribute
3038 cfs->skip_u1(attribute_length, CHECK);
3039 }
3040 }
3041 _annotations = assemble_annotations(runtime_visible_annotations,
3042 runtime_visible_annotations_length,
3043 runtime_invisible_annotations,
3044 runtime_invisible_annotations_length,
3045 CHECK);
3046 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3047 runtime_visible_type_annotations_length,
3048 runtime_invisible_type_annotations,
3049 runtime_invisible_type_annotations_length,
3050 CHECK);
3051
3052 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3053 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3054 inner_classes_attribute_start,
3055 parsed_innerclasses_attribute,
3056 enclosing_method_class_index,
3057 enclosing_method_method_index,
3058 CHECK);
3059 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3060 guarantee_property(
3061 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3062 "Wrong InnerClasses attribute length in class file %s", CHECK);
3063 }
3064 }
3065
3066 if (_max_bootstrap_specifier_index >= 0) {
3067 guarantee_property(parsed_bootstrap_methods_attribute,
3068 "Missing BootstrapMethods attribute in class file %s", CHECK);
3069 }
3070 }
3071
3072 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3073 if (_synthetic_flag)
3074 k->set_is_synthetic();
3075 if (_sourcefile_index != 0) {
3076 k->set_source_file_name_index(_sourcefile_index);
3077 }
3078 if (_generic_signature_index != 0) {
3079 k->set_generic_signature_index(_generic_signature_index);
3080 }
3081 if (_sde_buffer != NULL) {
3082 k->set_source_debug_extension(_sde_buffer, _sde_length);
3083 }
3084 }
3085
3086 // Create the Annotations object that will
3087 // hold the annotations array for the Klass.
3088 void ClassFileParser::create_combined_annotations(TRAPS) {
3089 if (_annotations == NULL &&
3090 _type_annotations == NULL &&
3091 _fields_annotations == NULL &&
3092 _fields_type_annotations == NULL) {
3093 // Don't create the Annotations object unnecessarily.
3094 return;
3095 }
3096
3097 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3098 annotations->set_class_annotations(_annotations);
3099 annotations->set_class_type_annotations(_type_annotations);
3100 annotations->set_fields_annotations(_fields_annotations);
3101 annotations->set_fields_type_annotations(_fields_type_annotations);
3102
3103 // This is the Annotations object that will be
3104 // assigned to InstanceKlass being constructed.
3105 _combined_annotations = annotations;
3106
3107 // The annotations arrays below has been transfered the
3108 // _combined_annotations so these fields can now be cleared.
3109 _annotations = NULL;
3110 _type_annotations = NULL;
3111 _fields_annotations = NULL;
3112 _fields_type_annotations = NULL;
3113 }
3114
3115 // Transfer ownership of metadata allocated to the InstanceKlass.
3116 void ClassFileParser::apply_parsed_class_metadata(
3117 instanceKlassHandle this_klass,
3118 int java_fields_count, TRAPS) {
3119 _cp->set_pool_holder(this_klass());
3120 this_klass->set_constants(_cp);
3121 this_klass->set_fields(_fields, java_fields_count);
3122 this_klass->set_methods(_methods);
3123 this_klass->set_inner_classes(_inner_classes);
3124 this_klass->set_local_interfaces(_local_interfaces);
3125 this_klass->set_transitive_interfaces(_transitive_interfaces);
3126 this_klass->set_annotations(_combined_annotations);
3127
3128 // Clear out these fields so they don't get deallocated by the destructor
3129 clear_class_metadata();
3130 }
3131
3132 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3133 int runtime_visible_annotations_length,
3134 u1* runtime_invisible_annotations,
3135 int runtime_invisible_annotations_length, TRAPS) {
3136 AnnotationArray* annotations = NULL;
3137 if (runtime_visible_annotations != NULL ||
3138 runtime_invisible_annotations != NULL) {
3139 annotations = MetadataFactory::new_array<u1>(_loader_data,
3140 runtime_visible_annotations_length +
3141 runtime_invisible_annotations_length,
3142 CHECK_(annotations));
3143 if (runtime_visible_annotations != NULL) {
3144 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3145 annotations->at_put(i, runtime_visible_annotations[i]);
3146 }
3147 }
3148 if (runtime_invisible_annotations != NULL) {
3149 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3150 int append = runtime_visible_annotations_length+i;
3151 annotations->at_put(append, runtime_invisible_annotations[i]);
3152 }
3153 }
3154 }
3155 return annotations;
3156 }
3157
3158 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3159 TRAPS) {
3160 instanceKlassHandle super_klass;
3161 if (super_class_index == 0) {
3162 check_property(_class_name == vmSymbols::java_lang_Object(),
3163 "Invalid superclass index %u in class file %s",
3164 super_class_index,
3165 CHECK_NULL);
3166 } else {
3167 check_property(valid_klass_reference_at(super_class_index),
3168 "Invalid superclass index %u in class file %s",
3169 super_class_index,
3170 CHECK_NULL);
3171 // The class name should be legal because it is checked when parsing constant pool.
3172 // However, make sure it is not an array type.
3173 bool is_array = false;
3174 if (_cp->tag_at(super_class_index).is_klass()) {
3175 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3176 if (_need_verify)
3177 is_array = super_klass->oop_is_array();
3178 } else if (_need_verify) {
3179 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3180 }
3181 if (_need_verify) {
3182 guarantee_property(!is_array,
3183 "Bad superclass name in class file %s", CHECK_NULL);
3184 }
3185 }
3186 return super_klass;
3187 }
3188
3189
3190 // Values needed for oopmap and InstanceKlass creation
3191 class FieldLayoutInfo : public StackObj {
3192 public:
3193 int* nonstatic_oop_offsets;
3194 unsigned int* nonstatic_oop_counts;
3195 unsigned int nonstatic_oop_map_count;
3196 unsigned int total_oop_map_count;
3197 int instance_size;
3198 int nonstatic_field_size;
3199 int static_field_size;
3200 bool has_nonstatic_fields;
3201 };
3202
3203 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3204 void ClassFileParser::layout_fields(Handle class_loader,
3205 FieldAllocationCount* fac,
3206 ClassAnnotationCollector* parsed_annotations,
3207 FieldLayoutInfo* info,
3208 TRAPS) {
3209
3210 // Field size and offset computation
3211 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3212 int next_static_oop_offset = 0;
3213 int next_static_double_offset = 0;
3214 int next_static_word_offset = 0;
3215 int next_static_short_offset = 0;
3216 int next_static_byte_offset = 0;
3217 int next_nonstatic_oop_offset = 0;
3218 int next_nonstatic_double_offset = 0;
3219 int next_nonstatic_word_offset = 0;
3220 int next_nonstatic_short_offset = 0;
3221 int next_nonstatic_byte_offset = 0;
3222 int first_nonstatic_oop_offset = 0;
3223 int next_nonstatic_field_offset = 0;
3224 int next_nonstatic_padded_offset = 0;
3225
3226 // Count the contended fields by type.
3227 //
3228 // We ignore static fields, because @Contended is not supported for them.
3229 // The layout code below will also ignore the static fields.
3230 int nonstatic_contended_count = 0;
3231 FieldAllocationCount fac_contended;
3232 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3233 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3234 if (fs.is_contended()) {
3235 fac_contended.count[atype]++;
3236 if (!fs.access_flags().is_static()) {
3237 nonstatic_contended_count++;
3238 }
3239 }
3240 }
3241
3242
3243 // Calculate the starting byte offsets
3244 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3245 next_static_double_offset = next_static_oop_offset +
3246 ((fac->count[STATIC_OOP]) * heapOopSize);
3247 if ( fac->count[STATIC_DOUBLE] &&
3248 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3249 Universe::field_type_should_be_aligned(T_LONG)) ) {
3250 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3251 }
3252
3253 next_static_word_offset = next_static_double_offset +
3254 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3255 next_static_short_offset = next_static_word_offset +
3256 ((fac->count[STATIC_WORD]) * BytesPerInt);
3257 next_static_byte_offset = next_static_short_offset +
3258 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3259
3260 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3261 nonstatic_field_size * heapOopSize;
3262
3263 next_nonstatic_field_offset = nonstatic_fields_start;
3264
3265 bool is_contended_class = parsed_annotations->is_contended();
3266
3267 // Class is contended, pad before all the fields
3268 if (is_contended_class) {
3269 next_nonstatic_field_offset += ContendedPaddingWidth;
3270 }
3271
3272 // Compute the non-contended fields count.
3273 // The packing code below relies on these counts to determine if some field
3274 // can be squeezed into the alignment gap. Contended fields are obviously
3275 // exempt from that.
3276 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3277 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3278 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3279 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3280 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3281
3282 // Total non-static fields count, including every contended field
3283 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3284 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3285 fac->count[NONSTATIC_OOP];
3286
3287 bool super_has_nonstatic_fields =
3288 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3289 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3290
3291
3292 // Prepare list of oops for oop map generation.
3293 //
3294 // "offset" and "count" lists are describing the set of contiguous oop
3295 // regions. offset[i] is the start of the i-th region, which then has
3296 // count[i] oops following. Before we know how many regions are required,
3297 // we pessimistically allocate the maps to fit all the oops into the
3298 // distinct regions.
3299 //
3300 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3301 // to figure out if we still need to do this.
3302 int* nonstatic_oop_offsets;
3303 unsigned int* nonstatic_oop_counts;
3304 unsigned int nonstatic_oop_map_count = 0;
3305 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3306
3307 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3308 THREAD, int, max_nonstatic_oop_maps);
3309 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3310 THREAD, unsigned int, max_nonstatic_oop_maps);
3311
3312 first_nonstatic_oop_offset = 0; // will be set for first oop field
3313
3314 bool compact_fields = CompactFields;
3315 int allocation_style = FieldsAllocationStyle;
3316 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3317 assert(false, "0 <= FieldsAllocationStyle <= 2");
3318 allocation_style = 1; // Optimistic
3319 }
3320
3321 // The next classes have predefined hard-coded fields offsets
3322 // (see in JavaClasses::compute_hard_coded_offsets()).
3323 // Use default fields allocation order for them.
3324 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3325 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3326 _class_name == vmSymbols::java_lang_Class() ||
3327 _class_name == vmSymbols::java_lang_ClassLoader() ||
3328 _class_name == vmSymbols::java_lang_ref_Reference() ||
3329 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3330 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3331 _class_name == vmSymbols::java_lang_String() ||
3332 _class_name == vmSymbols::java_lang_Throwable() ||
3333 _class_name == vmSymbols::java_lang_Boolean() ||
3334 _class_name == vmSymbols::java_lang_Character() ||
3335 _class_name == vmSymbols::java_lang_Float() ||
3336 _class_name == vmSymbols::java_lang_Double() ||
3337 _class_name == vmSymbols::java_lang_Byte() ||
3338 _class_name == vmSymbols::java_lang_Short() ||
3339 _class_name == vmSymbols::java_lang_Integer() ||
3340 _class_name == vmSymbols::java_lang_Long())) {
3341 allocation_style = 0; // Allocate oops first
3342 compact_fields = false; // Don't compact fields
3343 }
3344
3345 // Rearrange fields for a given allocation style
3346 if( allocation_style == 0 ) {
3347 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3348 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3349 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3350 (nonstatic_oop_count * heapOopSize);
3351 } else if( allocation_style == 1 ) {
3352 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3353 next_nonstatic_double_offset = next_nonstatic_field_offset;
3354 } else if( allocation_style == 2 ) {
3355 // Fields allocation: oops fields in super and sub classes are together.
3356 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3357 _super_klass->nonstatic_oop_map_size() > 0 ) {
3358 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3359 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3360 OopMapBlock* last_map = first_map + map_count - 1;
3361 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3362 if (next_offset == next_nonstatic_field_offset) {
3363 allocation_style = 0; // allocate oops first
3364 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3365 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3366 (nonstatic_oop_count * heapOopSize);
3367 }
3368 }
3369 if( allocation_style == 2 ) {
3370 allocation_style = 1; // allocate oops last
3371 next_nonstatic_double_offset = next_nonstatic_field_offset;
3372 }
3373 } else {
3374 ShouldNotReachHere();
3375 }
3376
3377 int nonstatic_oop_space_count = 0;
3378 int nonstatic_word_space_count = 0;
3379 int nonstatic_short_space_count = 0;
3380 int nonstatic_byte_space_count = 0;
3381 int nonstatic_oop_space_offset = 0;
3382 int nonstatic_word_space_offset = 0;
3383 int nonstatic_short_space_offset = 0;
3384 int nonstatic_byte_space_offset = 0;
3385
3386 // Try to squeeze some of the fields into the gaps due to
3387 // long/double alignment.
3388 if( nonstatic_double_count > 0 ) {
3389 int offset = next_nonstatic_double_offset;
3390 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3391 if( compact_fields && offset != next_nonstatic_double_offset ) {
3392 // Allocate available fields into the gap before double field.
3393 int length = next_nonstatic_double_offset - offset;
3394 assert(length == BytesPerInt, "");
3395 nonstatic_word_space_offset = offset;
3396 if( nonstatic_word_count > 0 ) {
3397 nonstatic_word_count -= 1;
3398 nonstatic_word_space_count = 1; // Only one will fit
3399 length -= BytesPerInt;
3400 offset += BytesPerInt;
3401 }
3402 nonstatic_short_space_offset = offset;
3403 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3404 nonstatic_short_count -= 1;
3405 nonstatic_short_space_count += 1;
3406 length -= BytesPerShort;
3407 offset += BytesPerShort;
3408 }
3409 nonstatic_byte_space_offset = offset;
3410 while( length > 0 && nonstatic_byte_count > 0 ) {
3411 nonstatic_byte_count -= 1;
3412 nonstatic_byte_space_count += 1;
3413 length -= 1;
3414 }
3415 // Allocate oop field in the gap if there are no other fields for that.
3416 nonstatic_oop_space_offset = offset;
3417 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3418 allocation_style != 0 ) { // when oop fields not first
3419 nonstatic_oop_count -= 1;
3420 nonstatic_oop_space_count = 1; // Only one will fit
3421 length -= heapOopSize;
3422 offset += heapOopSize;
3423 }
3424 }
3425 }
3426
3427 next_nonstatic_word_offset = next_nonstatic_double_offset +
3428 (nonstatic_double_count * BytesPerLong);
3429 next_nonstatic_short_offset = next_nonstatic_word_offset +
3430 (nonstatic_word_count * BytesPerInt);
3431 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3432 (nonstatic_short_count * BytesPerShort);
3433 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3434 nonstatic_byte_count;
3435
3436 // let oops jump before padding with this allocation style
3437 if( allocation_style == 1 ) {
3438 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3439 if( nonstatic_oop_count > 0 ) {
3440 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3441 }
3442 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3443 }
3444
3445 // Iterate over fields again and compute correct offsets.
3446 // The field allocation type was temporarily stored in the offset slot.
3447 // oop fields are located before non-oop fields (static and non-static).
3448 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3449
3450 // skip already laid out fields
3451 if (fs.is_offset_set()) continue;
3452
3453 // contended instance fields are handled below
3454 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3455
3456 int real_offset = 0;
3457 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3458
3459 // pack the rest of the fields
3460 switch (atype) {
3461 case STATIC_OOP:
3462 real_offset = next_static_oop_offset;
3463 next_static_oop_offset += heapOopSize;
3464 break;
3465 case STATIC_BYTE:
3466 real_offset = next_static_byte_offset;
3467 next_static_byte_offset += 1;
3468 break;
3469 case STATIC_SHORT:
3470 real_offset = next_static_short_offset;
3471 next_static_short_offset += BytesPerShort;
3472 break;
3473 case STATIC_WORD:
3474 real_offset = next_static_word_offset;
3475 next_static_word_offset += BytesPerInt;
3476 break;
3477 case STATIC_DOUBLE:
3478 real_offset = next_static_double_offset;
3479 next_static_double_offset += BytesPerLong;
3480 break;
3481 case NONSTATIC_OOP:
3482 if( nonstatic_oop_space_count > 0 ) {
3483 real_offset = nonstatic_oop_space_offset;
3484 nonstatic_oop_space_offset += heapOopSize;
3485 nonstatic_oop_space_count -= 1;
3486 } else {
3487 real_offset = next_nonstatic_oop_offset;
3488 next_nonstatic_oop_offset += heapOopSize;
3489 }
3490 // Update oop maps
3491 if( nonstatic_oop_map_count > 0 &&
3492 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3493 real_offset -
3494 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3495 heapOopSize ) {
3496 // Extend current oop map
3497 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3498 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3499 } else {
3500 // Create new oop map
3501 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3502 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3503 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3504 nonstatic_oop_map_count += 1;
3505 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3506 first_nonstatic_oop_offset = real_offset;
3507 }
3508 }
3509 break;
3510 case NONSTATIC_BYTE:
3511 if( nonstatic_byte_space_count > 0 ) {
3512 real_offset = nonstatic_byte_space_offset;
3513 nonstatic_byte_space_offset += 1;
3514 nonstatic_byte_space_count -= 1;
3515 } else {
3516 real_offset = next_nonstatic_byte_offset;
3517 next_nonstatic_byte_offset += 1;
3518 }
3519 break;
3520 case NONSTATIC_SHORT:
3521 if( nonstatic_short_space_count > 0 ) {
3522 real_offset = nonstatic_short_space_offset;
3523 nonstatic_short_space_offset += BytesPerShort;
3524 nonstatic_short_space_count -= 1;
3525 } else {
3526 real_offset = next_nonstatic_short_offset;
3527 next_nonstatic_short_offset += BytesPerShort;
3528 }
3529 break;
3530 case NONSTATIC_WORD:
3531 if( nonstatic_word_space_count > 0 ) {
3532 real_offset = nonstatic_word_space_offset;
3533 nonstatic_word_space_offset += BytesPerInt;
3534 nonstatic_word_space_count -= 1;
3535 } else {
3536 real_offset = next_nonstatic_word_offset;
3537 next_nonstatic_word_offset += BytesPerInt;
3538 }
3539 break;
3540 case NONSTATIC_DOUBLE:
3541 real_offset = next_nonstatic_double_offset;
3542 next_nonstatic_double_offset += BytesPerLong;
3543 break;
3544 default:
3545 ShouldNotReachHere();
3546 }
3547 fs.set_offset(real_offset);
3548 }
3549
3550
3551 // Handle the contended cases.
3552 //
3553 // Each contended field should not intersect the cache line with another contended field.
3554 // In the absence of alignment information, we end up with pessimistically separating
3555 // the fields with full-width padding.
3556 //
3557 // Additionally, this should not break alignment for the fields, so we round the alignment up
3558 // for each field.
3559 if (nonstatic_contended_count > 0) {
3560
3561 // if there is at least one contended field, we need to have pre-padding for them
3562 next_nonstatic_padded_offset += ContendedPaddingWidth;
3563
3564 // collect all contended groups
3565 BitMap bm(_cp->size());
3566 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3567 // skip already laid out fields
3568 if (fs.is_offset_set()) continue;
3569
3570 if (fs.is_contended()) {
3571 bm.set_bit(fs.contended_group());
3572 }
3573 }
3574
3575 int current_group = -1;
3576 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3577
3578 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3579
3580 // skip already laid out fields
3581 if (fs.is_offset_set()) continue;
3582
3583 // skip non-contended fields and fields from different group
3584 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3585
3586 // handle statics below
3587 if (fs.access_flags().is_static()) continue;
3588
3589 int real_offset = 0;
3590 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3591
3592 switch (atype) {
3593 case NONSTATIC_BYTE:
3594 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3595 real_offset = next_nonstatic_padded_offset;
3596 next_nonstatic_padded_offset += 1;
3597 break;
3598
3599 case NONSTATIC_SHORT:
3600 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3601 real_offset = next_nonstatic_padded_offset;
3602 next_nonstatic_padded_offset += BytesPerShort;
3603 break;
3604
3605 case NONSTATIC_WORD:
3606 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3607 real_offset = next_nonstatic_padded_offset;
3608 next_nonstatic_padded_offset += BytesPerInt;
3609 break;
3610
3611 case NONSTATIC_DOUBLE:
3612 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3613 real_offset = next_nonstatic_padded_offset;
3614 next_nonstatic_padded_offset += BytesPerLong;
3615 break;
3616
3617 case NONSTATIC_OOP:
3618 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3619 real_offset = next_nonstatic_padded_offset;
3620 next_nonstatic_padded_offset += heapOopSize;
3621
3622 // Create new oop map
3623 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3624 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3625 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3626 nonstatic_oop_map_count += 1;
3627 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3628 first_nonstatic_oop_offset = real_offset;
3629 }
3630 break;
3631
3632 default:
3633 ShouldNotReachHere();
3634 }
3635
3636 if (fs.contended_group() == 0) {
3637 // Contended group defines the equivalence class over the fields:
3638 // the fields within the same contended group are not inter-padded.
3639 // The only exception is default group, which does not incur the
3640 // equivalence, and so requires intra-padding.
3641 next_nonstatic_padded_offset += ContendedPaddingWidth;
3642 }
3643
3644 fs.set_offset(real_offset);
3645 } // for
3646
3647 // Start laying out the next group.
3648 // Note that this will effectively pad the last group in the back;
3649 // this is expected to alleviate memory contention effects for
3650 // subclass fields and/or adjacent object.
3651 // If this was the default group, the padding is already in place.
3652 if (current_group != 0) {
3653 next_nonstatic_padded_offset += ContendedPaddingWidth;
3654 }
3655 }
3656
3657 // handle static fields
3658 }
3659
3660 // Entire class is contended, pad in the back.
3661 // This helps to alleviate memory contention effects for subclass fields
3662 // and/or adjacent object.
3663 if (is_contended_class) {
3664 next_nonstatic_padded_offset += ContendedPaddingWidth;
3665 }
3666
3667 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3668
3669 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3670 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3671 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3672
3673 int static_field_size = (static_fields_end -
3674 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3675 nonstatic_field_size = nonstatic_field_size +
3676 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3677
3678 int instance_size = align_object_size(instance_end / wordSize);
3679
3680 assert(instance_size == align_object_size(align_size_up(
3681 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3682 wordSize) / wordSize), "consistent layout helper value");
3683
3684 // Invariant: nonstatic_field end/start should only change if there are
3685 // nonstatic fields in the class, or if the class is contended. We compare
3686 // against the non-aligned value, so that end alignment will not fail the
3687 // assert without actually having the fields.
3688 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3689 is_contended_class ||
3690 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3691
3692 // Number of non-static oop map blocks allocated at end of klass.
3693 const unsigned int total_oop_map_count =
3694 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3695 first_nonstatic_oop_offset);
3696
3697 #ifndef PRODUCT
3698 if (PrintFieldLayout) {
3699 print_field_layout(_class_name,
3700 _fields,
3701 _cp,
3702 instance_size,
3703 nonstatic_fields_start,
3704 nonstatic_fields_end,
3705 static_fields_end);
3706 }
3707
3708 #endif
3709 // Pass back information needed for InstanceKlass creation
3710 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3711 info->nonstatic_oop_counts = nonstatic_oop_counts;
3712 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3713 info->total_oop_map_count = total_oop_map_count;
3714 info->instance_size = instance_size;
3715 info->static_field_size = static_field_size;
3716 info->nonstatic_field_size = nonstatic_field_size;
3717 info->has_nonstatic_fields = has_nonstatic_fields;
3718 }
3719
3720
3721 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3722 ClassLoaderData* loader_data,
3723 Handle protection_domain,
3724 KlassHandle host_klass,
3725 GrowableArray<Handle>* cp_patches,
3726 TempNewSymbol& parsed_name,
3727 bool verify,
3728 TRAPS) {
3729
3730 // When a retransformable agent is attached, JVMTI caches the
3731 // class bytes that existed before the first retransformation.
3732 // If RedefineClasses() was used before the retransformable
3733 // agent attached, then the cached class bytes may not be the
3734 // original class bytes.
3735 JvmtiCachedClassFileData *cached_class_file = NULL;
3736 Handle class_loader(THREAD, loader_data->class_loader());
3737 bool has_default_methods = false;
3738 bool declares_default_methods = false;
3739 ResourceMark rm(THREAD);
3740
3741 ClassFileStream* cfs = stream();
3742 // Timing
3743 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3744 JavaThread* jt = (JavaThread*) THREAD;
3745
3746 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3747 ClassLoader::perf_class_parse_selftime(),
3748 NULL,
3749 jt->get_thread_stat()->perf_recursion_counts_addr(),
3750 jt->get_thread_stat()->perf_timers_addr(),
3751 PerfClassTraceTime::PARSE_CLASS);
3752
3753 init_parsed_class_attributes(loader_data);
3754
3755 if (JvmtiExport::should_post_class_file_load_hook()) {
3756 // Get the cached class file bytes (if any) from the class that
3757 // is being redefined or retransformed. We use jvmti_thread_state()
3758 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3759 // a JvmtiThreadState any earlier than necessary. This will help
3760 // avoid the bug described by 7126851.
3761 JvmtiThreadState *state = jt->jvmti_thread_state();
3762 if (state != NULL) {
3763 KlassHandle *h_class_being_redefined =
3764 state->get_class_being_redefined();
3765 if (h_class_being_redefined != NULL) {
3766 instanceKlassHandle ikh_class_being_redefined =
3767 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3768 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3769 }
3770 }
3771
3772 unsigned char* ptr = cfs->buffer();
3773 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3774
3775 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3776 &ptr, &end_ptr, &cached_class_file);
3777
3778 if (ptr != cfs->buffer()) {
3779 // JVMTI agent has modified class file data.
3780 // Set new class file stream using JVMTI agent modified
3781 // class file data.
3782 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3783 set_stream(cfs);
3784 }
3785 }
3786
3787 _host_klass = host_klass;
3788 _cp_patches = cp_patches;
3789
3790 instanceKlassHandle nullHandle;
3791
3792 // Figure out whether we can skip format checking (matching classic VM behavior)
3793 if (DumpSharedSpaces) {
3794 // verify == true means it's a 'remote' class (i.e., non-boot class)
3795 // Verification decision is based on BytecodeVerificationRemote flag
3796 // for those classes.
3797 _need_verify = (verify) ? BytecodeVerificationRemote :
3798 BytecodeVerificationLocal;
3799 } else {
3800 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3801 }
3802
3803 // Set the verify flag in stream
3804 cfs->set_verify(_need_verify);
3805
3806 // Save the class file name for easier error message printing.
3807 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3808
3809 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3810 // Magic value
3811 u4 magic = cfs->get_u4_fast();
3812 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3813 "Incompatible magic value %u in class file %s",
3814 magic, CHECK_(nullHandle));
3815
3816 // Version numbers
3817 u2 minor_version = cfs->get_u2_fast();
3818 u2 major_version = cfs->get_u2_fast();
3819
3820 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3821 ResourceMark rm;
3822 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3823 major_version, minor_version, name->as_C_string());
3824 Exceptions::fthrow(
3825 THREAD_AND_LOCATION,
3826 vmSymbols::java_lang_UnsupportedClassVersionError(),
3827 "Unsupported major.minor version for dump time %u.%u",
3828 major_version,
3829 minor_version);
3830 }
3831
3832 // Check version numbers - we check this even with verifier off
3833 if (!is_supported_version(major_version, minor_version)) {
3834 if (name == NULL) {
3835 Exceptions::fthrow(
3836 THREAD_AND_LOCATION,
3837 vmSymbols::java_lang_UnsupportedClassVersionError(),
3838 "Unsupported class file version %u.%u, "
3839 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3840 major_version,
3841 minor_version,
3842 JAVA_MAX_SUPPORTED_VERSION,
3843 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3844 } else {
3845 ResourceMark rm(THREAD);
3846 Exceptions::fthrow(
3847 THREAD_AND_LOCATION,
3848 vmSymbols::java_lang_UnsupportedClassVersionError(),
3849 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3850 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3851 name->as_C_string(),
3852 major_version,
3853 minor_version,
3854 JAVA_MAX_SUPPORTED_VERSION,
3855 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3856 }
3857 return nullHandle;
3858 }
3859
3860 _major_version = major_version;
3861 _minor_version = minor_version;
3862
3863
3864 // Check if verification needs to be relaxed for this class file
3865 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3866 _relax_verify = Verifier::relax_verify_for(class_loader());
3867
3868 // Constant pool
3869 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3870
3871 int cp_size = cp->length();
3872
3873 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3874
3875 // Access flags
3876 AccessFlags access_flags;
3877 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3878
3879 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3880 // Set abstract bit for old class files for backward compatibility
3881 flags |= JVM_ACC_ABSTRACT;
3882 }
3883 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3884 access_flags.set_flags(flags);
3885
3886 // This class and superclass
3887 _this_class_index = cfs->get_u2_fast();
3888 check_property(
3889 valid_cp_range(_this_class_index, cp_size) &&
3890 cp->tag_at(_this_class_index).is_unresolved_klass(),
3891 "Invalid this class index %u in constant pool in class file %s",
3892 _this_class_index, CHECK_(nullHandle));
3893
3894 Symbol* class_name = cp->unresolved_klass_at(_this_class_index);
3895 assert(class_name != NULL, "class_name can't be null");
3896
3897 // It's important to set parsed_name *before* resolving the super class.
3898 // (it's used for cleanup by the caller if parsing fails)
3899 parsed_name = class_name;
3900 // parsed_name is returned and can be used if there's an error, so add to
3901 // its reference count. Caller will decrement the refcount.
3902 parsed_name->increment_refcount();
3903
3904 // Update _class_name which could be null previously to be class_name
3905 _class_name = class_name;
3906
3907 // Don't need to check whether this class name is legal or not.
3908 // It has been checked when constant pool is parsed.
3909 // However, make sure it is not an array type.
3910 if (_need_verify) {
3911 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3912 "Bad class name in class file %s",
3913 CHECK_(nullHandle));
3914 }
3915
3916 Klass* preserve_this_klass; // for storing result across HandleMark
3917
3918 // release all handles when parsing is done
3919 { HandleMark hm(THREAD);
3920
3921 // Checks if name in class file matches requested name
3922 if (name != NULL && class_name != name) {
3923 ResourceMark rm(THREAD);
3924 Exceptions::fthrow(
3925 THREAD_AND_LOCATION,
3926 vmSymbols::java_lang_NoClassDefFoundError(),
3927 "%s (wrong name: %s)",
3928 name->as_C_string(),
3929 class_name->as_C_string()
3930 );
3931 return nullHandle;
3932 }
3933
3934 if (TraceClassLoadingPreorder) {
3935 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3936 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3937 tty->print_cr("]");
3938 }
3939 #if INCLUDE_CDS
3940 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3941 // Only dump the classes that can be stored into CDS archive
3942 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3943 if (name != NULL) {
3944 ResourceMark rm(THREAD);
3945 classlist_file->print_cr("%s", name->as_C_string());
3946 classlist_file->flush();
3947 }
3948 }
3949 }
3950 #endif
3951
3952 u2 super_class_index = cfs->get_u2_fast();
3953 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3954 CHECK_NULL);
3955
3956 // Interfaces
3957 u2 itfs_len = cfs->get_u2_fast();
3958 Array<Klass*>* local_interfaces =
3959 parse_interfaces(itfs_len, protection_domain, _class_name,
3960 &has_default_methods, CHECK_(nullHandle));
3961
3962 u2 java_fields_count = 0;
3963 // Fields (offsets are filled in later)
3964 FieldAllocationCount fac;
3965 Array<u2>* fields = parse_fields(class_name,
3966 access_flags.is_interface(),
3967 &fac, &java_fields_count,
3968 CHECK_(nullHandle));
3969 // Methods
3970 bool has_final_method = false;
3971 AccessFlags promoted_flags;
3972 promoted_flags.set_flags(0);
3973 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3974 &promoted_flags,
3975 &has_final_method,
3976 &declares_default_methods,
3977 CHECK_(nullHandle));
3978 if (declares_default_methods) {
3979 has_default_methods = true;
3980 }
3981
3982 // Additional attributes
3983 ClassAnnotationCollector parsed_annotations;
3984 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3985
3986 // Finalize the Annotations metadata object,
3987 // now that all annotation arrays have been created.
3988 create_combined_annotations(CHECK_(nullHandle));
3989
3990 // Make sure this is the end of class file stream
3991 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3992
3993 if (_class_name == vmSymbols::java_lang_Object()) {
3994 check_property(_local_interfaces == Universe::the_empty_klass_array(),
3995 "java.lang.Object cannot implement an interface in class file %s",
3996 CHECK_(nullHandle));
3997 }
3998 // We check super class after class file is parsed and format is checked
3999 if (super_class_index > 0 && super_klass.is_null()) {
4000 Symbol* sk = cp->klass_name_at(super_class_index);
4001 if (access_flags.is_interface()) {
4002 // Before attempting to resolve the superclass, check for class format
4003 // errors not checked yet.
4004 guarantee_property(sk == vmSymbols::java_lang_Object(),
4005 "Interfaces must have java.lang.Object as superclass in class file %s",
4006 CHECK_(nullHandle));
4007 }
4008 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4009 class_loader,
4010 protection_domain,
4011 true,
4012 CHECK_(nullHandle));
4013
4014 KlassHandle kh (THREAD, k);
4015 super_klass = instanceKlassHandle(THREAD, kh());
4016 }
4017 if (super_klass.not_null()) {
4018
4019 if (super_klass->has_default_methods()) {
4020 has_default_methods = true;
4021 }
4022
4023 if (super_klass->is_interface()) {
4024 ResourceMark rm(THREAD);
4025 Exceptions::fthrow(
4026 THREAD_AND_LOCATION,
4027 vmSymbols::java_lang_IncompatibleClassChangeError(),
4028 "class %s has interface %s as super class",
4029 class_name->as_klass_external_name(),
4030 super_klass->external_name()
4031 );
4032 return nullHandle;
4033 }
4034 // Make sure super class is not final
4035 if (super_klass->is_final()) {
4036 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4037 }
4038 }
4039
4040 // save super klass for error handling.
4041 _super_klass = super_klass;
4042
4043 // Compute the transitive list of all unique interfaces implemented by this class
4044 _transitive_interfaces =
4045 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4046
4047 // sort methods
4048 intArray* method_ordering = sort_methods(methods);
4049
4050 // promote flags from parse_methods() to the klass' flags
4051 access_flags.add_promoted_flags(promoted_flags.as_int());
4052
4053 // Size of Java vtable (in words)
4054 int vtable_size = 0;
4055 int itable_size = 0;
4056 int num_miranda_methods = 0;
4057
4058 GrowableArray<Method*> all_mirandas(20);
4059
4060 klassVtable::compute_vtable_size_and_num_mirandas(
4061 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4062 access_flags, class_loader, class_name, local_interfaces,
4063 CHECK_(nullHandle));
4064
4065 // Size of Java itable (in words)
4066 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4067
4068 FieldLayoutInfo info;
4069 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4070
4071 int total_oop_map_size2 =
4072 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4073
4074 // Compute reference type
4075 ReferenceType rt;
4076 if (super_klass() == NULL) {
4077 rt = REF_NONE;
4078 } else {
4079 rt = super_klass->reference_type();
4080 }
4081
4082 // We can now create the basic Klass* for this klass
4083 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4084 vtable_size,
4085 itable_size,
4086 info.static_field_size,
4087 total_oop_map_size2,
4088 rt,
4089 access_flags,
4090 name,
4091 super_klass(),
4092 !host_klass.is_null(),
4093 CHECK_(nullHandle));
4094 instanceKlassHandle this_klass (THREAD, _klass);
4095
4096 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4097 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4098 "sanity");
4099
4100 // Fill in information already parsed
4101 this_klass->set_should_verify_class(verify);
4102 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4103 this_klass->set_layout_helper(lh);
4104 assert(this_klass->oop_is_instance(), "layout is correct");
4105 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4106 // Not yet: supers are done below to support the new subtype-checking fields
4107 //this_klass->set_super(super_klass());
4108 this_klass->set_class_loader_data(loader_data);
4109 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4110 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4111 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4112
4113 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4114
4115 if (has_final_method) {
4116 this_klass->set_has_final_method();
4117 }
4118 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4119 // The InstanceKlass::_methods_jmethod_ids cache
4120 // is managed on the assumption that the initial cache
4121 // size is equal to the number of methods in the class. If
4122 // that changes, then InstanceKlass::idnum_can_increment()
4123 // has to be changed accordingly.
4124 this_klass->set_initial_method_idnum(methods->length());
4125 this_klass->set_name(cp->klass_name_at(_this_class_index));
4126 if (is_anonymous()) // I am well known to myself
4127 cp->klass_at_put(_this_class_index, this_klass()); // eagerly resolve
4128
4129 this_klass->set_minor_version(minor_version);
4130 this_klass->set_major_version(major_version);
4131 this_klass->set_has_default_methods(has_default_methods);
4132 this_klass->set_declares_default_methods(declares_default_methods);
4133
4134 if (!host_klass.is_null()) {
4135 assert (this_klass->is_anonymous(), "should be the same");
4136 this_klass->set_host_klass(host_klass());
4137 }
4138
4139 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4140 // (We used to do this lazily, but now we query it in Rewriter,
4141 // which is eagerly done for every method, so we might as well do it now,
4142 // when everything is fresh in memory.)
4143 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4144 for (int j = 0; j < methods->length(); j++) {
4145 methods->at(j)->init_intrinsic_id();
4146 }
4147 }
4148
4149 if (cached_class_file != NULL) {
4150 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4151 this_klass->set_cached_class_file(cached_class_file);
4152 }
4153
4154 // Fill in field values obtained by parse_classfile_attributes
4155 if (parsed_annotations.has_any_annotations())
4156 parsed_annotations.apply_to(this_klass);
4157 apply_parsed_class_attributes(this_klass);
4158
4159 // Miranda methods
4160 if ((num_miranda_methods > 0) ||
4161 // if this class introduced new miranda methods or
4162 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4163 // super class exists and this class inherited miranda methods
4164 ) {
4165 this_klass->set_has_miranda_methods(); // then set a flag
4166 }
4167
4168 // Fill in information needed to compute superclasses.
4169 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4170
4171 // Initialize itable offset tables
4172 klassItable::setup_itable_offset_table(this_klass);
4173
4174 // Compute transitive closure of interfaces this class implements
4175 // Do final class setup
4176 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4177
4178 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4179 set_precomputed_flags(this_klass);
4180
4181 // reinitialize modifiers, using the InnerClasses attribute
4182 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4183 this_klass->set_modifier_flags(computed_modifiers);
4184
4185 // check if this class can access its super class
4186 check_super_class_access(this_klass, CHECK_(nullHandle));
4187
4188 // check if this class can access its superinterfaces
4189 check_super_interface_access(this_klass, CHECK_(nullHandle));
4190
4191 // check if this class overrides any final method
4192 check_final_method_override(this_klass, CHECK_(nullHandle));
4193
4194 // check that if this class is an interface then it doesn't have static methods
4195 if (this_klass->is_interface()) {
4196 /* An interface in a JAVA 8 classfile can be static */
4197 if (_major_version < JAVA_8_VERSION) {
4198 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4199 }
4200 }
4201
4202 // Allocate mirror and initialize static fields
4203 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4204 CHECK_(nullHandle));
4205
4206 // Generate any default methods - default methods are interface methods
4207 // that have a default implementation. This is new with Lambda project.
4208 if (has_default_methods ) {
4209 DefaultMethods::generate_default_methods(
4210 this_klass(), &all_mirandas, CHECK_(nullHandle));
4211 }
4212
4213 // Update the loader_data graph.
4214 record_defined_class_dependencies(this_klass, CHECK_NULL);
4215
4216 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4217 false /* not shared class */);
4218
4219 if (TraceClassLoading) {
4220 ResourceMark rm;
4221 // print in a single call to reduce interleaving of output
4222 if (cfs->source() != NULL) {
4223 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4224 cfs->source());
4225 } else if (class_loader.is_null()) {
4226 Klass* caller =
4227 THREAD->is_Java_thread()
4228 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4229 : NULL;
4230 // caller can be NULL, for example, during a JVMTI VM_Init hook
4231 if (caller != NULL) {
4232 tty->print("[Loaded %s by instance of %s]\n",
4233 this_klass->external_name(),
4234 InstanceKlass::cast(caller)->external_name());
4235 } else {
4236 tty->print("[Loaded %s]\n", this_klass->external_name());
4237 }
4238 } else {
4239 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4240 InstanceKlass::cast(class_loader->klass())->external_name());
4241 }
4242 }
4243
4244 if (TraceClassResolution) {
4245 ResourceMark rm;
4246 // print out the superclass.
4247 const char * from = this_klass()->external_name();
4248 if (this_klass->java_super() != NULL) {
4249 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4250 }
4251 // print out each of the interface classes referred to by this class.
4252 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4253 if (local_interfaces != NULL) {
4254 int length = local_interfaces->length();
4255 for (int i = 0; i < length; i++) {
4256 Klass* k = local_interfaces->at(i);
4257 InstanceKlass* to_class = InstanceKlass::cast(k);
4258 const char * to = to_class->external_name();
4259 tty->print("RESOLVE %s %s (interface)\n", from, to);
4260 }
4261 }
4262 }
4263
4264 // preserve result across HandleMark
4265 preserve_this_klass = this_klass();
4266 }
4267
4268 JFR_ONLY(INIT_ID(preserve_this_klass);)
4269
4270 // Create new handle outside HandleMark (might be needed for
4271 // Extended Class Redefinition)
4272 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4273 debug_only(this_klass->verify();)
4274
4275 // Clear class if no error has occurred so destructor doesn't deallocate it
4276 _klass = NULL;
4277 return this_klass;
4278 }
4279
4280 // Destructor to clean up if there's an error
4281 ClassFileParser::~ClassFileParser() {
4282 MetadataFactory::free_metadata(_loader_data, _cp);
4283 MetadataFactory::free_array<u2>(_loader_data, _fields);
4284
4285 // Free methods
4286 InstanceKlass::deallocate_methods(_loader_data, _methods);
4287
4288 // beware of the Universe::empty_blah_array!!
4289 if (_inner_classes != Universe::the_empty_short_array()) {
4290 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4291 }
4292
4293 // Free interfaces
4294 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4295 _local_interfaces, _transitive_interfaces);
4296
4297 if (_combined_annotations != NULL) {
4298 // After all annotations arrays have been created, they are installed into the
4299 // Annotations object that will be assigned to the InstanceKlass being created.
4300
4301 // Deallocate the Annotations object and the installed annotations arrays.
4302 _combined_annotations->deallocate_contents(_loader_data);
4303
4304 // If the _combined_annotations pointer is non-NULL,
4305 // then the other annotations fields should have been cleared.
4306 assert(_annotations == NULL, "Should have been cleared");
4307 assert(_type_annotations == NULL, "Should have been cleared");
4308 assert(_fields_annotations == NULL, "Should have been cleared");
4309 assert(_fields_type_annotations == NULL, "Should have been cleared");
4310 } else {
4311 // If the annotations arrays were not installed into the Annotations object,
4312 // then they have to be deallocated explicitly.
4313 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4314 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4315 Annotations::free_contents(_loader_data, _fields_annotations);
4316 Annotations::free_contents(_loader_data, _fields_type_annotations);
4317 }
4318
4319 clear_class_metadata();
4320
4321 // deallocate the klass if already created. Don't directly deallocate, but add
4322 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4323 // at a safepoint.
4324 if (_klass != NULL) {
4325 _loader_data->add_to_deallocate_list(_klass);
4326 }
4327 _klass = NULL;
4328 }
4329
4330 void ClassFileParser::print_field_layout(Symbol* name,
4331 Array<u2>* fields,
4332 constantPoolHandle cp,
4333 int instance_size,
4334 int instance_fields_start,
4335 int instance_fields_end,
4336 int static_fields_end) {
4337 tty->print("%s: field layout\n", name->as_klass_external_name());
4338 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4339 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4340 if (!fs.access_flags().is_static()) {
4341 tty->print(" @%3d \"%s\" %s\n",
4342 fs.offset(),
4343 fs.name()->as_klass_external_name(),
4344 fs.signature()->as_klass_external_name());
4345 }
4346 }
4347 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4348 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4349 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4350 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4351 if (fs.access_flags().is_static()) {
4352 tty->print(" @%3d \"%s\" %s\n",
4353 fs.offset(),
4354 fs.name()->as_klass_external_name(),
4355 fs.signature()->as_klass_external_name());
4356 }
4357 }
4358 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4359 tty->print("\n");
4360 }
4361
4362 unsigned int
4363 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4364 unsigned int nonstatic_oop_map_count,
4365 int first_nonstatic_oop_offset) {
4366 unsigned int map_count =
4367 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4368 if (nonstatic_oop_map_count > 0) {
4369 // We have oops to add to map
4370 if (map_count == 0) {
4371 map_count = nonstatic_oop_map_count;
4372 } else {
4373 // Check whether we should add a new map block or whether the last one can
4374 // be extended
4375 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4376 OopMapBlock* const last_map = first_map + map_count - 1;
4377
4378 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4379 if (next_offset == first_nonstatic_oop_offset) {
4380 // There is no gap bettwen superklass's last oop field and first
4381 // local oop field, merge maps.
4382 nonstatic_oop_map_count -= 1;
4383 } else {
4384 // Superklass didn't end with a oop field, add extra maps
4385 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4386 }
4387 map_count += nonstatic_oop_map_count;
4388 }
4389 }
4390 return map_count;
4391 }
4392
4393
4394 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4395 unsigned int nonstatic_oop_map_count,
4396 int* nonstatic_oop_offsets,
4397 unsigned int* nonstatic_oop_counts) {
4398 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4399 const InstanceKlass* const super = k->superklass();
4400 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4401 if (super_count > 0) {
4402 // Copy maps from superklass
4403 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4404 for (unsigned int i = 0; i < super_count; ++i) {
4405 *this_oop_map++ = *super_oop_map++;
4406 }
4407 }
4408
4409 if (nonstatic_oop_map_count > 0) {
4410 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4411 // The counts differ because there is no gap between superklass's last oop
4412 // field and the first local oop field. Extend the last oop map copied
4413 // from the superklass instead of creating new one.
4414 nonstatic_oop_map_count--;
4415 nonstatic_oop_offsets++;
4416 this_oop_map--;
4417 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4418 this_oop_map++;
4419 }
4420
4421 // Add new map blocks, fill them
4422 while (nonstatic_oop_map_count-- > 0) {
4423 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4424 this_oop_map->set_count(*nonstatic_oop_counts++);
4425 this_oop_map++;
4426 }
4427 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4428 this_oop_map, "sanity");
4429 }
4430 }
4431
4432
4433 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4434 Klass* super = k->super();
4435
4436 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4437 // in which case we don't have to register objects as finalizable
4438 if (!_has_empty_finalizer) {
4439 if (_has_finalizer ||
4440 (super != NULL && super->has_finalizer())) {
4441 k->set_has_finalizer();
4442 }
4443 }
4444
4445 #ifdef ASSERT
4446 bool f = false;
4447 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4448 vmSymbols::void_method_signature());
4449 if (m != NULL && !m->is_empty_method()) {
4450 f = true;
4451 }
4452
4453 // Spec doesn't prevent agent from redefinition of empty finalizer.
4454 // Despite the fact that it's generally bad idea and redefined finalizer
4455 // will not work as expected we shouldn't abort vm in this case
4456 if (!k->has_redefined_this_or_super()) {
4457 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4458 }
4459 #endif
4460
4461 // Check if this klass supports the java.lang.Cloneable interface
4462 if (SystemDictionary::Cloneable_klass_loaded()) {
4463 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4464 k->set_is_cloneable();
4465 }
4466 }
4467
4468 // Check if this klass has a vanilla default constructor
4469 if (super == NULL) {
4470 // java.lang.Object has empty default constructor
4471 k->set_has_vanilla_constructor();
4472 } else {
4473 if (super->has_vanilla_constructor() &&
4474 _has_vanilla_constructor) {
4475 k->set_has_vanilla_constructor();
4476 }
4477 #ifdef ASSERT
4478 bool v = false;
4479 if (super->has_vanilla_constructor()) {
4480 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4481 ), vmSymbols::void_method_signature());
4482 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4483 v = true;
4484 }
4485 }
4486 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4487 #endif
4488 }
4489
4490 // If it cannot be fast-path allocated, set a bit in the layout helper.
4491 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4492 assert(k->size_helper() > 0, "layout_helper is initialized");
4493 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4494 || k->is_abstract() || k->is_interface()
4495 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4496 || k->size_helper() >= FastAllocateSizeLimit) {
4497 // Forbid fast-path allocation.
4498 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4499 k->set_layout_helper(lh);
4500 }
4501 }
4502
4503 // Attach super classes and interface classes to class loader data
4504 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4505 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4506 if (defining_loader_data->is_the_null_class_loader_data()) {
4507 // Dependencies to null class loader data are implicit.
4508 return;
4509 } else {
4510 // add super class dependency
4511 Klass* super = defined_klass->super();
4512 if (super != NULL) {
4513 defining_loader_data->record_dependency(super, CHECK);
4514 }
4515
4516 // add super interface dependencies
4517 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4518 if (local_interfaces != NULL) {
4519 int length = local_interfaces->length();
4520 for (int i = 0; i < length; i++) {
4521 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4522 }
4523 }
4524 }
4525 }
4526
4527 // utility methods for appending an array with check for duplicates
4528
4529 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4530 // iterate over new interfaces
4531 for (int i = 0; i < ifs->length(); i++) {
4532 Klass* e = ifs->at(i);
4533 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4534 // add new interface
4535 result->append_if_missing(e);
4536 }
4537 }
4538
4539 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4540 instanceKlassHandle super,
4541 Array<Klass*>* local_ifs, TRAPS) {
4542 // Compute maximum size for transitive interfaces
4543 int max_transitive_size = 0;
4544 int super_size = 0;
4545 // Add superclass transitive interfaces size
4546 if (super.not_null()) {
4547 super_size = super->transitive_interfaces()->length();
4548 max_transitive_size += super_size;
4549 }
4550 // Add local interfaces' super interfaces
4551 int local_size = local_ifs->length();
4552 for (int i = 0; i < local_size; i++) {
4553 Klass* l = local_ifs->at(i);
4554 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4555 }
4556 // Finally add local interfaces
4557 max_transitive_size += local_size;
4558 // Construct array
4559 if (max_transitive_size == 0) {
4560 // no interfaces, use canonicalized array
4561 return Universe::the_empty_klass_array();
4562 } else if (max_transitive_size == super_size) {
4563 // no new local interfaces added, share superklass' transitive interface array
4564 return super->transitive_interfaces();
4565 } else if (max_transitive_size == local_size) {
4566 // only local interfaces added, share local interface array
4567 return local_ifs;
4568 } else {
4569 ResourceMark rm;
4570 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4571
4572 // Copy down from superclass
4573 if (super.not_null()) {
4574 append_interfaces(result, super->transitive_interfaces());
4575 }
4576
4577 // Copy down from local interfaces' superinterfaces
4578 for (int i = 0; i < local_ifs->length(); i++) {
4579 Klass* l = local_ifs->at(i);
4580 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4581 }
4582 // Finally add local interfaces
4583 append_interfaces(result, local_ifs);
4584
4585 // length will be less than the max_transitive_size if duplicates were removed
4586 int length = result->length();
4587 assert(length <= max_transitive_size, "just checking");
4588 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4589 for (int i = 0; i < length; i++) {
4590 Klass* e = result->at(i);
4591 assert(e != NULL, "just checking");
4592 new_result->at_put(i, e);
4593 }
4594 return new_result;
4595 }
4596 }
4597
4598 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4599 Klass* super = this_klass->super();
4600 if ((super != NULL) &&
4601 (!Reflection::verify_class_access(this_klass(), super, false))) {
4602 ResourceMark rm(THREAD);
4603 Exceptions::fthrow(
4604 THREAD_AND_LOCATION,
4605 vmSymbols::java_lang_IllegalAccessError(),
4606 "class %s cannot access its superclass %s",
4607 this_klass->external_name(),
4608 InstanceKlass::cast(super)->external_name()
4609 );
4610 return;
4611 }
4612 }
4613
4614
4615 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4616 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4617 int lng = local_interfaces->length();
4618 for (int i = lng - 1; i >= 0; i--) {
4619 Klass* k = local_interfaces->at(i);
4620 assert (k != NULL && k->is_interface(), "invalid interface");
4621 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4622 ResourceMark rm(THREAD);
4623 Exceptions::fthrow(
4624 THREAD_AND_LOCATION,
4625 vmSymbols::java_lang_IllegalAccessError(),
4626 "class %s cannot access its superinterface %s",
4627 this_klass->external_name(),
4628 InstanceKlass::cast(k)->external_name()
4629 );
4630 return;
4631 }
4632 }
4633 }
4634
4635
4636 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4637 Array<Method*>* methods = this_klass->methods();
4638 int num_methods = methods->length();
4639
4640 // go thru each method and check if it overrides a final method
4641 for (int index = 0; index < num_methods; index++) {
4642 Method* m = methods->at(index);
4643
4644 // skip private, static, and <init> methods
4645 if ((!m->is_private() && !m->is_static()) &&
4646 (m->name() != vmSymbols::object_initializer_name())) {
4647
4648 Symbol* name = m->name();
4649 Symbol* signature = m->signature();
4650 Klass* k = this_klass->super();
4651 Method* super_m = NULL;
4652 while (k != NULL) {
4653 // skip supers that don't have final methods.
4654 if (k->has_final_method()) {
4655 // lookup a matching method in the super class hierarchy
4656 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4657 if (super_m == NULL) {
4658 break; // didn't find any match; get out
4659 }
4660
4661 if (super_m->is_final() && !super_m->is_static() &&
4662 // matching method in super is final, and not static
4663 (Reflection::verify_field_access(this_klass(),
4664 super_m->method_holder(),
4665 super_m->method_holder(),
4666 super_m->access_flags(), false))
4667 // this class can access super final method and therefore override
4668 ) {
4669 ResourceMark rm(THREAD);
4670 Exceptions::fthrow(
4671 THREAD_AND_LOCATION,
4672 vmSymbols::java_lang_VerifyError(),
4673 "class %s overrides final method %s.%s",
4674 this_klass->external_name(),
4675 name->as_C_string(),
4676 signature->as_C_string()
4677 );
4678 return;
4679 }
4680
4681 // continue to look from super_m's holder's super.
4682 k = super_m->method_holder()->super();
4683 continue;
4684 }
4685
4686 k = k->super();
4687 }
4688 }
4689 }
4690 }
4691
4692
4693 // assumes that this_klass is an interface
4694 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4695 assert(this_klass->is_interface(), "not an interface");
4696 Array<Method*>* methods = this_klass->methods();
4697 int num_methods = methods->length();
4698
4699 for (int index = 0; index < num_methods; index++) {
4700 Method* m = methods->at(index);
4701 // if m is static and not the init method, throw a verify error
4702 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4703 ResourceMark rm(THREAD);
4704 Exceptions::fthrow(
4705 THREAD_AND_LOCATION,
4706 vmSymbols::java_lang_VerifyError(),
4707 "Illegal static method %s in interface %s",
4708 m->name()->as_C_string(),
4709 this_klass->external_name()
4710 );
4711 return;
4712 }
4713 }
4714 }
4715
4716 // utility methods for format checking
4717
4718 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4719 if (!_need_verify) { return; }
4720
4721 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4722 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4723 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4724 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4725 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4726 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4727 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4728
4729 if ((is_abstract && is_final) ||
4730 (is_interface && !is_abstract) ||
4731 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4732 (!is_interface && major_gte_15 && is_annotation)) {
4733 ResourceMark rm(THREAD);
4734 Exceptions::fthrow(
4735 THREAD_AND_LOCATION,
4736 vmSymbols::java_lang_ClassFormatError(),
4737 "Illegal class modifiers in class %s: 0x%X",
4738 _class_name->as_C_string(), flags
4739 );
4740 return;
4741 }
4742 }
4743
4744 bool ClassFileParser::has_illegal_visibility(jint flags) {
4745 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4746 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4747 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4748
4749 return ((is_public && is_protected) ||
4750 (is_public && is_private) ||
4751 (is_protected && is_private));
4752 }
4753
4754 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4755 u2 max_version =
4756 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4757 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4758 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4759 (major <= max_version) &&
4760 ((major != max_version) ||
4761 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4762 }
4763
4764 void ClassFileParser::verify_legal_field_modifiers(
4765 jint flags, bool is_interface, TRAPS) {
4766 if (!_need_verify) { return; }
4767
4768 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4769 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4770 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4771 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4772 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4773 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4774 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4775 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4776 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4777
4778 bool is_illegal = false;
4779
4780 if (is_interface) {
4781 if (!is_public || !is_static || !is_final || is_private ||
4782 is_protected || is_volatile || is_transient ||
4783 (major_gte_15 && is_enum)) {
4784 is_illegal = true;
4785 }
4786 } else { // not interface
4787 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4788 is_illegal = true;
4789 }
4790 }
4791
4792 if (is_illegal) {
4793 ResourceMark rm(THREAD);
4794 Exceptions::fthrow(
4795 THREAD_AND_LOCATION,
4796 vmSymbols::java_lang_ClassFormatError(),
4797 "Illegal field modifiers in class %s: 0x%X",
4798 _class_name->as_C_string(), flags);
4799 return;
4800 }
4801 }
4802
4803 void ClassFileParser::verify_legal_method_modifiers(
4804 jint flags, bool is_interface, Symbol* name, TRAPS) {
4805 if (!_need_verify) { return; }
4806
4807 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4808 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4809 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4810 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4811 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4812 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4813 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4814 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4815 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4816 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4817 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4818 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4819 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4820
4821 bool is_illegal = false;
4822
4823 if (is_interface) {
4824 if (major_gte_8) {
4825 // Class file version is JAVA_8_VERSION or later Methods of
4826 // interfaces may set any of the flags except ACC_PROTECTED,
4827 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4828 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4829 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4830 (is_native || is_protected || is_final || is_synchronized) ||
4831 // If a specific method of a class or interface has its
4832 // ACC_ABSTRACT flag set, it must not have any of its
4833 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4834 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4835 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4836 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4837 (is_abstract && (is_private || is_static || is_strict))) {
4838 is_illegal = true;
4839 }
4840 } else if (major_gte_15) {
4841 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4842 if (!is_public || is_static || is_final || is_synchronized ||
4843 is_native || !is_abstract || is_strict) {
4844 is_illegal = true;
4845 }
4846 } else {
4847 // Class file version is pre-JAVA_1_5_VERSION
4848 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4849 is_illegal = true;
4850 }
4851 }
4852 } else { // not interface
4853 if (is_initializer) {
4854 if (is_static || is_final || is_synchronized || is_native ||
4855 is_abstract || (major_gte_15 && is_bridge)) {
4856 is_illegal = true;
4857 }
4858 } else { // not initializer
4859 if (is_abstract) {
4860 if ((is_final || is_native || is_private || is_static ||
4861 (major_gte_15 && (is_synchronized || is_strict)))) {
4862 is_illegal = true;
4863 }
4864 }
4865 if (has_illegal_visibility(flags)) {
4866 is_illegal = true;
4867 }
4868 }
4869 }
4870
4871 if (is_illegal) {
4872 ResourceMark rm(THREAD);
4873 Exceptions::fthrow(
4874 THREAD_AND_LOCATION,
4875 vmSymbols::java_lang_ClassFormatError(),
4876 "Method %s in class %s has illegal modifiers: 0x%X",
4877 name->as_C_string(), _class_name->as_C_string(), flags);
4878 return;
4879 }
4880 }
4881
4882 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4883 assert(_need_verify, "only called when _need_verify is true");
4884 int i = 0;
4885 int count = length >> 2;
4886 for (int k=0; k<count; k++) {
4887 unsigned char b0 = buffer[i];
4888 unsigned char b1 = buffer[i+1];
4889 unsigned char b2 = buffer[i+2];
4890 unsigned char b3 = buffer[i+3];
4891 // For an unsigned char v,
4892 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4893 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4894 unsigned char res = b0 | b0 - 1 |
4895 b1 | b1 - 1 |
4896 b2 | b2 - 1 |
4897 b3 | b3 - 1;
4898 if (res >= 128) break;
4899 i += 4;
4900 }
4901 for(; i < length; i++) {
4902 unsigned short c;
4903 // no embedded zeros
4904 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4905 if(buffer[i] < 128) {
4906 continue;
4907 }
4908 if ((i + 5) < length) { // see if it's legal supplementary character
4909 if (UTF8::is_supplementary_character(&buffer[i])) {
4910 c = UTF8::get_supplementary_character(&buffer[i]);
4911 i += 5;
4912 continue;
4913 }
4914 }
4915 switch (buffer[i] >> 4) {
4916 default: break;
4917 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4918 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4919 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4920 c = (buffer[i] & 0x1F) << 6;
4921 i++;
4922 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4923 c += buffer[i] & 0x3F;
4924 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4925 // for classes with major > 47, c must a null or a character in its shortest form
4926 break;
4927 }
4928 }
4929 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4930 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4931 c = (buffer[i] & 0xF) << 12;
4932 i += 2;
4933 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4934 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4935 if (_major_version <= 47 || c >= 0x800) {
4936 // for classes with major > 47, c must be in its shortest form
4937 break;
4938 }
4939 }
4940 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4941 } // end of switch
4942 } // end of for
4943 }
4944
4945 // Checks if name is a legal class name.
4946 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4947 if (!_need_verify || _relax_verify) { return; }
4948
4949 char buf[fixed_buffer_size];
4950 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4951 unsigned int length = name->utf8_length();
4952 bool legal = false;
4953
4954 if (length > 0) {
4955 char* p;
4956 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4957 p = skip_over_field_signature(bytes, false, length, CHECK);
4958 legal = (p != NULL) && ((p - bytes) == (int)length);
4959 } else if (_major_version < JAVA_1_5_VERSION) {
4960 if (bytes[0] != '<') {
4961 p = skip_over_field_name(bytes, true, length);
4962 legal = (p != NULL) && ((p - bytes) == (int)length);
4963 }
4964 } else {
4965 // 4900761: relax the constraints based on JSR202 spec
4966 // Class names may be drawn from the entire Unicode character set.
4967 // Identifiers between '/' must be unqualified names.
4968 // The utf8 string has been verified when parsing cpool entries.
4969 legal = verify_unqualified_name(bytes, length, LegalClass);
4970 }
4971 }
4972 if (!legal) {
4973 ResourceMark rm(THREAD);
4974 Exceptions::fthrow(
4975 THREAD_AND_LOCATION,
4976 vmSymbols::java_lang_ClassFormatError(),
4977 "Illegal class name \"%s\" in class file %s", bytes,
4978 _class_name->as_C_string()
4979 );
4980 return;
4981 }
4982 }
4983
4984 // Checks if name is a legal field name.
4985 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4986 if (!_need_verify || _relax_verify) { return; }
4987
4988 char buf[fixed_buffer_size];
4989 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4990 unsigned int length = name->utf8_length();
4991 bool legal = false;
4992
4993 if (length > 0) {
4994 if (_major_version < JAVA_1_5_VERSION) {
4995 if (bytes[0] != '<') {
4996 char* p = skip_over_field_name(bytes, false, length);
4997 legal = (p != NULL) && ((p - bytes) == (int)length);
4998 }
4999 } else {
5000 // 4881221: relax the constraints based on JSR202 spec
5001 legal = verify_unqualified_name(bytes, length, LegalField);
5002 }
5003 }
5004
5005 if (!legal) {
5006 ResourceMark rm(THREAD);
5007 Exceptions::fthrow(
5008 THREAD_AND_LOCATION,
5009 vmSymbols::java_lang_ClassFormatError(),
5010 "Illegal field name \"%s\" in class %s", bytes,
5011 _class_name->as_C_string()
5012 );
5013 return;
5014 }
5015 }
5016
5017 // Checks if name is a legal method name.
5018 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5019 if (!_need_verify || _relax_verify) { return; }
5020
5021 assert(name != NULL, "method name is null");
5022 char buf[fixed_buffer_size];
5023 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5024 unsigned int length = name->utf8_length();
5025 bool legal = false;
5026
5027 if (length > 0) {
5028 if (bytes[0] == '<') {
5029 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5030 legal = true;
5031 }
5032 } else if (_major_version < JAVA_1_5_VERSION) {
5033 char* p;
5034 p = skip_over_field_name(bytes, false, length);
5035 legal = (p != NULL) && ((p - bytes) == (int)length);
5036 } else {
5037 // 4881221: relax the constraints based on JSR202 spec
5038 legal = verify_unqualified_name(bytes, length, LegalMethod);
5039 }
5040 }
5041
5042 if (!legal) {
5043 ResourceMark rm(THREAD);
5044 Exceptions::fthrow(
5045 THREAD_AND_LOCATION,
5046 vmSymbols::java_lang_ClassFormatError(),
5047 "Illegal method name \"%s\" in class %s", bytes,
5048 _class_name->as_C_string()
5049 );
5050 return;
5051 }
5052 }
5053
5054
5055 // Checks if signature is a legal field signature.
5056 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5057 if (!_need_verify) { return; }
5058
5059 char buf[fixed_buffer_size];
5060 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5061 unsigned int length = signature->utf8_length();
5062 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5063
5064 if (p == NULL || (p - bytes) != (int)length) {
5065 throwIllegalSignature("Field", name, signature, CHECK);
5066 }
5067 }
5068
5069 // Checks if signature is a legal method signature.
5070 // Returns number of parameters
5071 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5072 if (!_need_verify) {
5073 // make sure caller's args_size will be less than 0 even for non-static
5074 // method so it will be recomputed in compute_size_of_parameters().
5075 return -2;
5076 }
5077
5078 unsigned int args_size = 0;
5079 char buf[fixed_buffer_size];
5080 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5081 unsigned int length = signature->utf8_length();
5082 char* nextp;
5083
5084 // The first character must be a '('
5085 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5086 length--;
5087 // Skip over legal field signatures
5088 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5089 while ((length > 0) && (nextp != NULL)) {
5090 args_size++;
5091 if (p[0] == 'J' || p[0] == 'D') {
5092 args_size++;
5093 }
5094 length -= nextp - p;
5095 p = nextp;
5096 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5097 }
5098 // The first non-signature thing better be a ')'
5099 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5100 length--;
5101 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5102 // All internal methods must return void
5103 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5104 return args_size;
5105 }
5106 } else {
5107 // Now we better just have a return value
5108 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5109 if (nextp && ((int)length == (nextp - p))) {
5110 return args_size;
5111 }
5112 }
5113 }
5114 }
5115 // Report error
5116 throwIllegalSignature("Method", name, signature, CHECK_0);
5117 return 0;
5118 }
5119
5120
5121 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5122 // Method names also may not contain the characters '<' or '>', unless <init>
5123 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5124 // method. Because these names have been checked as special cases before
5125 // calling this method in verify_legal_method_name.
5126 bool ClassFileParser::verify_unqualified_name(
5127 char* name, unsigned int length, int type) {
5128 jchar ch;
5129
5130 for (char* p = name; p != name + length; ) {
5131 ch = *p;
5132 if (ch < 128) {
5133 p++;
5134 if (ch == '.' || ch == ';' || ch == '[' ) {
5135 return false; // do not permit '.', ';', or '['
5136 }
5137 if (type != LegalClass && ch == '/') {
5138 return false; // do not permit '/' unless it's class name
5139 }
5140 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5141 return false; // do not permit '<' or '>' in method names
5142 }
5143 } else {
5144 char* tmp_p = UTF8::next(p, &ch);
5145 p = tmp_p;
5146 }
5147 }
5148 return true;
5149 }
5150
5151
5152 // Take pointer to a string. Skip over the longest part of the string that could
5153 // be taken as a fieldname. Allow '/' if slash_ok is true.
5154 // Return a pointer to just past the fieldname.
5155 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5156 // being true, we saw consecutive slashes (meaning we were looking for a
5157 // qualified path but found something that was badly-formed).
5158 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5159 char* p;
5160 jchar ch;
5161 jboolean last_is_slash = false;
5162 jboolean not_first_ch = false;
5163
5164 for (p = name; p != name + length; not_first_ch = true) {
5165 char* old_p = p;
5166 ch = *p;
5167 if (ch < 128) {
5168 p++;
5169 // quick check for ascii
5170 if ((ch >= 'a' && ch <= 'z') ||
5171 (ch >= 'A' && ch <= 'Z') ||
5172 (ch == '_' || ch == '$') ||
5173 (not_first_ch && ch >= '0' && ch <= '9')) {
5174 last_is_slash = false;
5175 continue;
5176 }
5177 if (slash_ok && ch == '/') {
5178 if (last_is_slash) {
5179 return NULL; // Don't permit consecutive slashes
5180 }
5181 last_is_slash = true;
5182 continue;
5183 }
5184 } else {
5185 jint unicode_ch;
5186 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5187 p = tmp_p;
5188 last_is_slash = false;
5189 // Check if ch is Java identifier start or is Java identifier part
5190 // 4672820: call java.lang.Character methods directly without generating separate tables.
5191 EXCEPTION_MARK;
5192 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5193
5194 // return value
5195 JavaValue result(T_BOOLEAN);
5196 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5197 JavaCallArguments args;
5198 args.push_int(unicode_ch);
5199
5200 // public static boolean isJavaIdentifierStart(char ch);
5201 JavaCalls::call_static(&result,
5202 klass,
5203 vmSymbols::isJavaIdentifierStart_name(),
5204 vmSymbols::int_bool_signature(),
5205 &args,
5206 THREAD);
5207
5208 if (HAS_PENDING_EXCEPTION) {
5209 CLEAR_PENDING_EXCEPTION;
5210 return 0;
5211 }
5212 if (result.get_jboolean()) {
5213 continue;
5214 }
5215
5216 if (not_first_ch) {
5217 // public static boolean isJavaIdentifierPart(char ch);
5218 JavaCalls::call_static(&result,
5219 klass,
5220 vmSymbols::isJavaIdentifierPart_name(),
5221 vmSymbols::int_bool_signature(),
5222 &args,
5223 THREAD);
5224
5225 if (HAS_PENDING_EXCEPTION) {
5226 CLEAR_PENDING_EXCEPTION;
5227 return 0;
5228 }
5229
5230 if (result.get_jboolean()) {
5231 continue;
5232 }
5233 }
5234 }
5235 return (not_first_ch) ? old_p : NULL;
5236 }
5237 return (not_first_ch) ? p : NULL;
5238 }
5239
5240
5241 // Take pointer to a string. Skip over the longest part of the string that could
5242 // be taken as a field signature. Allow "void" if void_ok.
5243 // Return a pointer to just past the signature.
5244 // Return NULL if no legal signature is found.
5245 char* ClassFileParser::skip_over_field_signature(char* signature,
5246 bool void_ok,
5247 unsigned int length,
5248 TRAPS) {
5249 unsigned int array_dim = 0;
5250 while (length > 0) {
5251 switch (signature[0]) {
5252 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5253 case JVM_SIGNATURE_BOOLEAN:
5254 case JVM_SIGNATURE_BYTE:
5255 case JVM_SIGNATURE_CHAR:
5256 case JVM_SIGNATURE_SHORT:
5257 case JVM_SIGNATURE_INT:
5258 case JVM_SIGNATURE_FLOAT:
5259 case JVM_SIGNATURE_LONG:
5260 case JVM_SIGNATURE_DOUBLE:
5261 return signature + 1;
5262 case JVM_SIGNATURE_CLASS: {
5263 if (_major_version < JAVA_1_5_VERSION) {
5264 // Skip over the class name if one is there
5265 char* p = skip_over_field_name(signature + 1, true, --length);
5266
5267 // The next character better be a semicolon
5268 if (p && (p - signature) > 1 && p[0] == ';') {
5269 return p + 1;
5270 }
5271 } else {
5272 // 4900761: For class version > 48, any unicode is allowed in class name.
5273 length--;
5274 signature++;
5275 while (length > 0 && signature[0] != ';') {
5276 if (signature[0] == '.') {
5277 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5278 }
5279 length--;
5280 signature++;
5281 }
5282 if (signature[0] == ';') { return signature + 1; }
5283 }
5284
5285 return NULL;
5286 }
5287 case JVM_SIGNATURE_ARRAY:
5288 array_dim++;
5289 if (array_dim > 255) {
5290 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5291 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5292 }
5293 // The rest of what's there better be a legal signature
5294 signature++;
5295 length--;
5296 void_ok = false;
5297 break;
5298
5299 default:
5300 return NULL;
5301 }
5302 }
5303 return NULL;
5304 }
5305
5306 #if INCLUDE_JFR
5307
5308 // Caller responsible for ResourceMark
5309 // clone stream with rewound position
5310 ClassFileStream* ClassFileParser::clone_stream() const {
5311 assert(_stream != NULL, "invariant");
5312
5313 return _stream->clone();
5314 }
5315
5316 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5317 #ifdef ASSERT
5318 if (klass != NULL) {
5319 assert(NULL == _klass, "leaking?");
5320 }
5321 #endif
5322
5323 _klass = klass;
5324 }
5325
5326 #endif // INCLUDE_JFR