Thu, 24 Mar 2016 21:38:15 -0700
8150752: Share Class Data
Reviewed-by: acorn, hseigel, mschoene
1 /*
2 * Copyright (c) 1997, 2016, 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 */
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"
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.
73 // We add assert in debug mode when class format is not checked.
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
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
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
90 // Used for backward compatibility reasons:
91 // - to check NameAndType_info signatures more aggressively
92 #define JAVA_7_VERSION 51
94 // Extension method support.
95 #define JAVA_8_VERSION 52
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());
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;
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);
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 }
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 = (int) strlen(str);
279 }
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 }
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 }
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 }
316 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
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 }
325 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
326 ClassFileStream* cfs = stream();
327 constantPoolHandle nullHandle;
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);
339 // parsing constant pool entries
340 parse_constant_pool_entries(length, CHECK_(nullHandle));
342 int index = 1; // declared outside of loops for portability
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
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 }
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 }
519 if (!_need_verify) {
520 return cp;
521 }
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 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
541 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
542 } else {
543 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
544 }
545 }
546 break;
547 }
548 case JVM_CONSTANT_InvokeDynamic:
549 case JVM_CONSTANT_Fieldref:
550 case JVM_CONSTANT_Methodref:
551 case JVM_CONSTANT_InterfaceMethodref: {
552 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
553 // already verified to be utf8
554 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
555 // already verified to be utf8
556 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
557 Symbol* name = cp->symbol_at(name_ref_index);
558 Symbol* signature = cp->symbol_at(signature_ref_index);
559 if (tag == JVM_CONSTANT_Fieldref) {
560 verify_legal_field_name(name, CHECK_(nullHandle));
561 if (_need_verify && _major_version >= JAVA_7_VERSION) {
562 // Signature is verified above, when iterating NameAndType_info.
563 // Need only to be sure it's the right type.
564 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
565 throwIllegalSignature(
566 "Field", name, signature, CHECK_(nullHandle));
567 }
568 } else {
569 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
570 }
571 } else {
572 verify_legal_method_name(name, CHECK_(nullHandle));
573 if (_need_verify && _major_version >= JAVA_7_VERSION) {
574 // Signature is verified above, when iterating NameAndType_info.
575 // Need only to be sure it's the right type.
576 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
577 throwIllegalSignature(
578 "Method", name, signature, CHECK_(nullHandle));
579 }
580 } else {
581 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
582 }
583 if (tag == JVM_CONSTANT_Methodref) {
584 // 4509014: If a class method name begins with '<', it must be "<init>".
585 assert(name != NULL, "method name in constant pool is null");
586 unsigned int name_len = name->utf8_length();
587 assert(name_len > 0, "bad method name"); // already verified as legal name
588 if (name->byte_at(0) == '<') {
589 if (name != vmSymbols::object_initializer_name()) {
590 classfile_parse_error(
591 "Bad method name at constant pool index %u in class file %s",
592 name_ref_index, CHECK_(nullHandle));
593 }
594 }
595 }
596 }
597 break;
598 }
599 case JVM_CONSTANT_MethodHandle: {
600 int ref_index = cp->method_handle_index_at(index);
601 int ref_kind = cp->method_handle_ref_kind_at(index);
602 switch (ref_kind) {
603 case JVM_REF_invokeVirtual:
604 case JVM_REF_invokeStatic:
605 case JVM_REF_invokeSpecial:
606 case JVM_REF_newInvokeSpecial:
607 {
608 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
609 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
610 Symbol* name = cp->symbol_at(name_ref_index);
611 if (ref_kind == JVM_REF_newInvokeSpecial) {
612 if (name != vmSymbols::object_initializer_name()) {
613 classfile_parse_error(
614 "Bad constructor name at constant pool index %u in class file %s",
615 name_ref_index, CHECK_(nullHandle));
616 }
617 } else {
618 if (name == vmSymbols::object_initializer_name()) {
619 classfile_parse_error(
620 "Bad method name at constant pool index %u in class file %s",
621 name_ref_index, CHECK_(nullHandle));
622 }
623 }
624 }
625 break;
626 // Other ref_kinds are already fully checked in previous pass.
627 }
628 break;
629 }
630 case JVM_CONSTANT_MethodType: {
631 Symbol* no_name = vmSymbols::type_name(); // place holder
632 Symbol* signature = cp->method_type_signature_at(index);
633 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
634 break;
635 }
636 case JVM_CONSTANT_Utf8: {
637 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
638 }
639 } // end of switch
640 } // end of for
642 return cp;
643 }
646 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
647 assert(EnableInvokeDynamic, "");
648 BasicType patch_type = T_VOID;
650 switch (cp->tag_at(index).value()) {
652 case JVM_CONSTANT_UnresolvedClass :
653 // Patching a class means pre-resolving it.
654 // The name in the constant pool is ignored.
655 if (java_lang_Class::is_instance(patch())) {
656 guarantee_property(!java_lang_Class::is_primitive(patch()),
657 "Illegal class patch at %d in class file %s",
658 index, CHECK);
659 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
660 } else {
661 guarantee_property(java_lang_String::is_instance(patch()),
662 "Illegal class patch at %d in class file %s",
663 index, CHECK);
664 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
665 cp->unresolved_klass_at_put(index, name);
666 }
667 break;
669 case JVM_CONSTANT_String :
670 // skip this patch and don't clear it. Needs the oop array for resolved
671 // references to be created first.
672 return;
674 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
675 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
676 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
677 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
678 patch_prim:
679 {
680 jvalue value;
681 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
682 guarantee_property(value_type == patch_type,
683 "Illegal primitive patch at %d in class file %s",
684 index, CHECK);
685 switch (value_type) {
686 case T_INT: cp->int_at_put(index, value.i); break;
687 case T_FLOAT: cp->float_at_put(index, value.f); break;
688 case T_LONG: cp->long_at_put(index, value.j); break;
689 case T_DOUBLE: cp->double_at_put(index, value.d); break;
690 default: assert(false, "");
691 }
692 }
693 break;
695 default:
696 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
697 guarantee_property(!has_cp_patch_at(index),
698 "Illegal unexpected patch at %d in class file %s",
699 index, CHECK);
700 return;
701 }
703 // On fall-through, mark the patch as used.
704 clear_cp_patch_at(index);
705 }
709 class NameSigHash: public ResourceObj {
710 public:
711 Symbol* _name; // name
712 Symbol* _sig; // signature
713 NameSigHash* _next; // Next entry in hash table
714 };
717 #define HASH_ROW_SIZE 256
719 unsigned int hash(Symbol* name, Symbol* sig) {
720 unsigned int raw_hash = 0;
721 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
722 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
724 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
725 }
728 void initialize_hashtable(NameSigHash** table) {
729 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
730 }
732 // Return false if the name/sig combination is found in table.
733 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
734 // The old format checker uses heap sort to find duplicates.
735 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
736 // of table since we don't expect Symbol*'s to move.
737 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
738 assert(name != NULL, "name in constant pool is NULL");
740 // First lookup for duplicates
741 int index = hash(name, sig);
742 NameSigHash* entry = table[index];
743 while (entry != NULL) {
744 if (entry->_name == name && entry->_sig == sig) {
745 return false;
746 }
747 entry = entry->_next;
748 }
750 // No duplicate is found, allocate a new entry and fill it.
751 entry = new NameSigHash();
752 entry->_name = name;
753 entry->_sig = sig;
755 // Insert into hash table
756 entry->_next = table[index];
757 table[index] = entry;
759 return true;
760 }
763 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
764 Handle protection_domain,
765 Symbol* class_name,
766 bool* has_default_methods,
767 TRAPS) {
768 if (length == 0) {
769 _local_interfaces = Universe::the_empty_klass_array();
770 } else {
771 ClassFileStream* cfs = stream();
772 assert(length > 0, "only called for length>0");
773 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
775 int index;
776 for (index = 0; index < length; index++) {
777 u2 interface_index = cfs->get_u2(CHECK_NULL);
778 KlassHandle interf;
779 check_property(
780 valid_klass_reference_at(interface_index),
781 "Interface name has bad constant pool index %u in class file %s",
782 interface_index, CHECK_NULL);
783 if (_cp->tag_at(interface_index).is_klass()) {
784 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
785 } else {
786 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
788 // Don't need to check legal name because it's checked when parsing constant pool.
789 // But need to make sure it's not an array type.
790 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
791 "Bad interface name in class file %s", CHECK_NULL);
792 Handle class_loader(THREAD, _loader_data->class_loader());
794 // Call resolve_super so classcircularity is checked
795 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
796 unresolved_klass, class_loader, protection_domain,
797 false, CHECK_NULL);
798 interf = KlassHandle(THREAD, k);
799 }
801 if (!interf()->is_interface()) {
802 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
803 }
804 if (InstanceKlass::cast(interf())->has_default_methods()) {
805 *has_default_methods = true;
806 }
807 _local_interfaces->at_put(index, interf());
808 }
810 if (!_need_verify || length <= 1) {
811 return _local_interfaces;
812 }
814 // Check if there's any duplicates in interfaces
815 ResourceMark rm(THREAD);
816 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
817 THREAD, NameSigHash*, HASH_ROW_SIZE);
818 initialize_hashtable(interface_names);
819 bool dup = false;
820 {
821 debug_only(No_Safepoint_Verifier nsv;)
822 for (index = 0; index < length; index++) {
823 Klass* k = _local_interfaces->at(index);
824 Symbol* name = InstanceKlass::cast(k)->name();
825 // If no duplicates, add (name, NULL) in hashtable interface_names.
826 if (!put_after_lookup(name, NULL, interface_names)) {
827 dup = true;
828 break;
829 }
830 }
831 }
832 if (dup) {
833 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
834 }
835 }
836 return _local_interfaces;
837 }
840 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
841 // Make sure the constant pool entry is of a type appropriate to this field
842 guarantee_property(
843 (constantvalue_index > 0 &&
844 constantvalue_index < _cp->length()),
845 "Bad initial value index %u in ConstantValue attribute in class file %s",
846 constantvalue_index, CHECK);
847 constantTag value_type = _cp->tag_at(constantvalue_index);
848 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
849 case T_LONG:
850 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
851 break;
852 case T_FLOAT:
853 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
854 break;
855 case T_DOUBLE:
856 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
857 break;
858 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
859 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
860 break;
861 case T_OBJECT:
862 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
863 && value_type.is_string()),
864 "Bad string initial value in class file %s", CHECK);
865 break;
866 default:
867 classfile_parse_error(
868 "Unable to set initial value %u in class file %s",
869 constantvalue_index, CHECK);
870 }
871 }
874 // Parse attributes for a field.
875 void ClassFileParser::parse_field_attributes(u2 attributes_count,
876 bool is_static, u2 signature_index,
877 u2* constantvalue_index_addr,
878 bool* is_synthetic_addr,
879 u2* generic_signature_index_addr,
880 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
881 TRAPS) {
882 ClassFileStream* cfs = stream();
883 assert(attributes_count > 0, "length should be greater than 0");
884 u2 constantvalue_index = 0;
885 u2 generic_signature_index = 0;
886 bool is_synthetic = false;
887 u1* runtime_visible_annotations = NULL;
888 int runtime_visible_annotations_length = 0;
889 u1* runtime_invisible_annotations = NULL;
890 int runtime_invisible_annotations_length = 0;
891 u1* runtime_visible_type_annotations = NULL;
892 int runtime_visible_type_annotations_length = 0;
893 u1* runtime_invisible_type_annotations = NULL;
894 int runtime_invisible_type_annotations_length = 0;
895 bool runtime_invisible_type_annotations_exists = false;
896 while (attributes_count--) {
897 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
898 u2 attribute_name_index = cfs->get_u2_fast();
899 u4 attribute_length = cfs->get_u4_fast();
900 check_property(valid_symbol_at(attribute_name_index),
901 "Invalid field attribute index %u in class file %s",
902 attribute_name_index,
903 CHECK);
904 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
905 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
906 // ignore if non-static
907 if (constantvalue_index != 0) {
908 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
909 }
910 check_property(
911 attribute_length == 2,
912 "Invalid ConstantValue field attribute length %u in class file %s",
913 attribute_length, CHECK);
914 constantvalue_index = cfs->get_u2(CHECK);
915 if (_need_verify) {
916 verify_constantvalue(constantvalue_index, signature_index, CHECK);
917 }
918 } else if (attribute_name == vmSymbols::tag_synthetic()) {
919 if (attribute_length != 0) {
920 classfile_parse_error(
921 "Invalid Synthetic field attribute length %u in class file %s",
922 attribute_length, CHECK);
923 }
924 is_synthetic = true;
925 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
926 if (attribute_length != 0) {
927 classfile_parse_error(
928 "Invalid Deprecated field attribute length %u in class file %s",
929 attribute_length, CHECK);
930 }
931 } else if (_major_version >= JAVA_1_5_VERSION) {
932 if (attribute_name == vmSymbols::tag_signature()) {
933 if (attribute_length != 2) {
934 classfile_parse_error(
935 "Wrong size %u for field's Signature attribute in class file %s",
936 attribute_length, CHECK);
937 }
938 generic_signature_index = parse_generic_signature_attribute(CHECK);
939 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
940 runtime_visible_annotations_length = attribute_length;
941 runtime_visible_annotations = cfs->get_u1_buffer();
942 assert(runtime_visible_annotations != NULL, "null visible annotations");
943 parse_annotations(runtime_visible_annotations,
944 runtime_visible_annotations_length,
945 parsed_annotations,
946 CHECK);
947 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
948 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
949 runtime_invisible_annotations_length = attribute_length;
950 runtime_invisible_annotations = cfs->get_u1_buffer();
951 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
952 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
953 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
954 if (runtime_visible_type_annotations != NULL) {
955 classfile_parse_error(
956 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
957 }
958 runtime_visible_type_annotations_length = attribute_length;
959 runtime_visible_type_annotations = cfs->get_u1_buffer();
960 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
961 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
962 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
963 if (runtime_invisible_type_annotations_exists) {
964 classfile_parse_error(
965 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
966 } else {
967 runtime_invisible_type_annotations_exists = true;
968 }
969 if (PreserveAllAnnotations) {
970 runtime_invisible_type_annotations_length = attribute_length;
971 runtime_invisible_type_annotations = cfs->get_u1_buffer();
972 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
973 }
974 cfs->skip_u1(attribute_length, CHECK);
975 } else {
976 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
977 }
978 } else {
979 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
980 }
981 }
983 *constantvalue_index_addr = constantvalue_index;
984 *is_synthetic_addr = is_synthetic;
985 *generic_signature_index_addr = generic_signature_index;
986 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
987 runtime_visible_annotations_length,
988 runtime_invisible_annotations,
989 runtime_invisible_annotations_length,
990 CHECK);
991 parsed_annotations->set_field_annotations(a);
992 a = assemble_annotations(runtime_visible_type_annotations,
993 runtime_visible_type_annotations_length,
994 runtime_invisible_type_annotations,
995 runtime_invisible_type_annotations_length,
996 CHECK);
997 parsed_annotations->set_field_type_annotations(a);
998 return;
999 }
1002 // Field allocation types. Used for computing field offsets.
1004 enum FieldAllocationType {
1005 STATIC_OOP, // Oops
1006 STATIC_BYTE, // Boolean, Byte, char
1007 STATIC_SHORT, // shorts
1008 STATIC_WORD, // ints
1009 STATIC_DOUBLE, // aligned long or double
1010 NONSTATIC_OOP,
1011 NONSTATIC_BYTE,
1012 NONSTATIC_SHORT,
1013 NONSTATIC_WORD,
1014 NONSTATIC_DOUBLE,
1015 MAX_FIELD_ALLOCATION_TYPE,
1016 BAD_ALLOCATION_TYPE = -1
1017 };
1019 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1020 BAD_ALLOCATION_TYPE, // 0
1021 BAD_ALLOCATION_TYPE, // 1
1022 BAD_ALLOCATION_TYPE, // 2
1023 BAD_ALLOCATION_TYPE, // 3
1024 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1025 NONSTATIC_SHORT, // T_CHAR = 5,
1026 NONSTATIC_WORD, // T_FLOAT = 6,
1027 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1028 NONSTATIC_BYTE, // T_BYTE = 8,
1029 NONSTATIC_SHORT, // T_SHORT = 9,
1030 NONSTATIC_WORD, // T_INT = 10,
1031 NONSTATIC_DOUBLE, // T_LONG = 11,
1032 NONSTATIC_OOP, // T_OBJECT = 12,
1033 NONSTATIC_OOP, // T_ARRAY = 13,
1034 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1035 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1036 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1037 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1038 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1039 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1040 BAD_ALLOCATION_TYPE, // 0
1041 BAD_ALLOCATION_TYPE, // 1
1042 BAD_ALLOCATION_TYPE, // 2
1043 BAD_ALLOCATION_TYPE, // 3
1044 STATIC_BYTE , // T_BOOLEAN = 4,
1045 STATIC_SHORT, // T_CHAR = 5,
1046 STATIC_WORD, // T_FLOAT = 6,
1047 STATIC_DOUBLE, // T_DOUBLE = 7,
1048 STATIC_BYTE, // T_BYTE = 8,
1049 STATIC_SHORT, // T_SHORT = 9,
1050 STATIC_WORD, // T_INT = 10,
1051 STATIC_DOUBLE, // T_LONG = 11,
1052 STATIC_OOP, // T_OBJECT = 12,
1053 STATIC_OOP, // T_ARRAY = 13,
1054 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1055 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1056 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1057 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1058 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1059 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1060 };
1062 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1063 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1064 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1065 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1066 return result;
1067 }
1069 class FieldAllocationCount: public ResourceObj {
1070 public:
1071 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1073 FieldAllocationCount() {
1074 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1075 count[i] = 0;
1076 }
1077 }
1079 FieldAllocationType update(bool is_static, BasicType type) {
1080 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1081 // Make sure there is no overflow with injected fields.
1082 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1083 count[atype]++;
1084 return atype;
1085 }
1086 };
1088 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1089 bool is_interface,
1090 FieldAllocationCount *fac,
1091 u2* java_fields_count_ptr, TRAPS) {
1092 ClassFileStream* cfs = stream();
1093 cfs->guarantee_more(2, CHECK_NULL); // length
1094 u2 length = cfs->get_u2_fast();
1095 *java_fields_count_ptr = length;
1097 int num_injected = 0;
1098 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1099 int total_fields = length + num_injected;
1101 // The field array starts with tuples of shorts
1102 // [access, name index, sig index, initial value index, byte offset].
1103 // A generic signature slot only exists for field with generic
1104 // signature attribute. And the access flag is set with
1105 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1106 // signature slots are at the end of the field array and after all
1107 // other fields data.
1108 //
1109 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1110 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1111 // ...
1112 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1113 // [generic signature index]
1114 // [generic signature index]
1115 // ...
1116 //
1117 // Allocate a temporary resource array for field data. For each field,
1118 // a slot is reserved in the temporary array for the generic signature
1119 // index. After parsing all fields, the data are copied to a permanent
1120 // array and any unused slots will be discarded.
1121 ResourceMark rm(THREAD);
1122 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1123 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1125 // The generic signature slots start after all other fields' data.
1126 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1127 int num_generic_signature = 0;
1128 for (int n = 0; n < length; n++) {
1129 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1131 AccessFlags access_flags;
1132 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1133 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1134 access_flags.set_flags(flags);
1136 u2 name_index = cfs->get_u2_fast();
1137 int cp_size = _cp->length();
1138 check_property(valid_symbol_at(name_index),
1139 "Invalid constant pool index %u for field name in class file %s",
1140 name_index,
1141 CHECK_NULL);
1142 Symbol* name = _cp->symbol_at(name_index);
1143 verify_legal_field_name(name, CHECK_NULL);
1145 u2 signature_index = cfs->get_u2_fast();
1146 check_property(valid_symbol_at(signature_index),
1147 "Invalid constant pool index %u for field signature in class file %s",
1148 signature_index, CHECK_NULL);
1149 Symbol* sig = _cp->symbol_at(signature_index);
1150 verify_legal_field_signature(name, sig, CHECK_NULL);
1152 u2 constantvalue_index = 0;
1153 bool is_synthetic = false;
1154 u2 generic_signature_index = 0;
1155 bool is_static = access_flags.is_static();
1156 FieldAnnotationCollector parsed_annotations(_loader_data);
1158 u2 attributes_count = cfs->get_u2_fast();
1159 if (attributes_count > 0) {
1160 parse_field_attributes(attributes_count, is_static, signature_index,
1161 &constantvalue_index, &is_synthetic,
1162 &generic_signature_index, &parsed_annotations,
1163 CHECK_NULL);
1164 if (parsed_annotations.field_annotations() != NULL) {
1165 if (_fields_annotations == NULL) {
1166 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1167 _loader_data, length, NULL,
1168 CHECK_NULL);
1169 }
1170 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1171 parsed_annotations.set_field_annotations(NULL);
1172 }
1173 if (parsed_annotations.field_type_annotations() != NULL) {
1174 if (_fields_type_annotations == NULL) {
1175 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1176 _loader_data, length, NULL,
1177 CHECK_NULL);
1178 }
1179 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1180 parsed_annotations.set_field_type_annotations(NULL);
1181 }
1183 if (is_synthetic) {
1184 access_flags.set_is_synthetic();
1185 }
1186 if (generic_signature_index != 0) {
1187 access_flags.set_field_has_generic_signature();
1188 fa[generic_signature_slot] = generic_signature_index;
1189 generic_signature_slot ++;
1190 num_generic_signature ++;
1191 }
1192 }
1194 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1195 field->initialize(access_flags.as_short(),
1196 name_index,
1197 signature_index,
1198 constantvalue_index);
1199 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1201 // Remember how many oops we encountered and compute allocation type
1202 FieldAllocationType atype = fac->update(is_static, type);
1203 field->set_allocation_type(atype);
1205 // After field is initialized with type, we can augment it with aux info
1206 if (parsed_annotations.has_any_annotations())
1207 parsed_annotations.apply_to(field);
1208 }
1210 int index = length;
1211 if (num_injected != 0) {
1212 for (int n = 0; n < num_injected; n++) {
1213 // Check for duplicates
1214 if (injected[n].may_be_java) {
1215 Symbol* name = injected[n].name();
1216 Symbol* signature = injected[n].signature();
1217 bool duplicate = false;
1218 for (int i = 0; i < length; i++) {
1219 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1220 if (name == _cp->symbol_at(f->name_index()) &&
1221 signature == _cp->symbol_at(f->signature_index())) {
1222 // Symbol is desclared in Java so skip this one
1223 duplicate = true;
1224 break;
1225 }
1226 }
1227 if (duplicate) {
1228 // These will be removed from the field array at the end
1229 continue;
1230 }
1231 }
1233 // Injected field
1234 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1235 field->initialize(JVM_ACC_FIELD_INTERNAL,
1236 injected[n].name_index,
1237 injected[n].signature_index,
1238 0);
1240 BasicType type = FieldType::basic_type(injected[n].signature());
1242 // Remember how many oops we encountered and compute allocation type
1243 FieldAllocationType atype = fac->update(false, type);
1244 field->set_allocation_type(atype);
1245 index++;
1246 }
1247 }
1249 // Now copy the fields' data from the temporary resource array.
1250 // Sometimes injected fields already exist in the Java source so
1251 // the fields array could be too long. In that case the
1252 // fields array is trimed. Also unused slots that were reserved
1253 // for generic signature indexes are discarded.
1254 Array<u2>* fields = MetadataFactory::new_array<u2>(
1255 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1256 CHECK_NULL);
1257 _fields = fields; // save in case of error
1258 {
1259 int i = 0;
1260 for (; i < index * FieldInfo::field_slots; i++) {
1261 fields->at_put(i, fa[i]);
1262 }
1263 for (int j = total_fields * FieldInfo::field_slots;
1264 j < generic_signature_slot; j++) {
1265 fields->at_put(i++, fa[j]);
1266 }
1267 assert(i == fields->length(), "");
1268 }
1270 if (_need_verify && length > 1) {
1271 // Check duplicated fields
1272 ResourceMark rm(THREAD);
1273 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1274 THREAD, NameSigHash*, HASH_ROW_SIZE);
1275 initialize_hashtable(names_and_sigs);
1276 bool dup = false;
1277 {
1278 debug_only(No_Safepoint_Verifier nsv;)
1279 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1280 Symbol* name = fs.name();
1281 Symbol* sig = fs.signature();
1282 // If no duplicates, add name/signature in hashtable names_and_sigs.
1283 if (!put_after_lookup(name, sig, names_and_sigs)) {
1284 dup = true;
1285 break;
1286 }
1287 }
1288 }
1289 if (dup) {
1290 classfile_parse_error("Duplicate field name&signature in class file %s",
1291 CHECK_NULL);
1292 }
1293 }
1295 return fields;
1296 }
1299 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1300 while (length-- > 0) {
1301 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1302 }
1303 }
1306 u2* ClassFileParser::parse_exception_table(u4 code_length,
1307 u4 exception_table_length,
1308 TRAPS) {
1309 ClassFileStream* cfs = stream();
1311 u2* exception_table_start = cfs->get_u2_buffer();
1312 assert(exception_table_start != NULL, "null exception table");
1313 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1314 // Will check legal target after parsing code array in verifier.
1315 if (_need_verify) {
1316 for (unsigned int i = 0; i < exception_table_length; i++) {
1317 u2 start_pc = cfs->get_u2_fast();
1318 u2 end_pc = cfs->get_u2_fast();
1319 u2 handler_pc = cfs->get_u2_fast();
1320 u2 catch_type_index = cfs->get_u2_fast();
1321 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1322 "Illegal exception table range in class file %s",
1323 CHECK_NULL);
1324 guarantee_property(handler_pc < code_length,
1325 "Illegal exception table handler in class file %s",
1326 CHECK_NULL);
1327 if (catch_type_index != 0) {
1328 guarantee_property(valid_klass_reference_at(catch_type_index),
1329 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1330 }
1331 }
1332 } else {
1333 cfs->skip_u2_fast(exception_table_length * 4);
1334 }
1335 return exception_table_start;
1336 }
1338 void ClassFileParser::parse_linenumber_table(
1339 u4 code_attribute_length, u4 code_length,
1340 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1341 ClassFileStream* cfs = stream();
1342 unsigned int num_entries = cfs->get_u2(CHECK);
1344 // Each entry is a u2 start_pc, and a u2 line_number
1345 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1347 // Verify line number attribute and table length
1348 check_property(
1349 code_attribute_length == sizeof(u2) + length_in_bytes,
1350 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1352 cfs->guarantee_more(length_in_bytes, CHECK);
1354 if ((*write_stream) == NULL) {
1355 if (length_in_bytes > fixed_buffer_size) {
1356 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1357 } else {
1358 (*write_stream) = new CompressedLineNumberWriteStream(
1359 linenumbertable_buffer, fixed_buffer_size);
1360 }
1361 }
1363 while (num_entries-- > 0) {
1364 u2 bci = cfs->get_u2_fast(); // start_pc
1365 u2 line = cfs->get_u2_fast(); // line_number
1366 guarantee_property(bci < code_length,
1367 "Invalid pc in LineNumberTable in class file %s", CHECK);
1368 (*write_stream)->write_pair(bci, line);
1369 }
1370 }
1373 // Class file LocalVariableTable elements.
1374 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1375 public:
1376 u2 start_bci;
1377 u2 length;
1378 u2 name_cp_index;
1379 u2 descriptor_cp_index;
1380 u2 slot;
1381 };
1384 class LVT_Hash: public CHeapObj<mtClass> {
1385 public:
1386 LocalVariableTableElement *_elem; // element
1387 LVT_Hash* _next; // Next entry in hash table
1388 };
1390 unsigned int hash(LocalVariableTableElement *elem) {
1391 unsigned int raw_hash = elem->start_bci;
1393 raw_hash = elem->length + raw_hash * 37;
1394 raw_hash = elem->name_cp_index + raw_hash * 37;
1395 raw_hash = elem->slot + raw_hash * 37;
1397 return raw_hash % HASH_ROW_SIZE;
1398 }
1400 void initialize_hashtable(LVT_Hash** table) {
1401 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1402 table[i] = NULL;
1403 }
1404 }
1406 void clear_hashtable(LVT_Hash** table) {
1407 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1408 LVT_Hash* current = table[i];
1409 LVT_Hash* next;
1410 while (current != NULL) {
1411 next = current->_next;
1412 current->_next = NULL;
1413 delete(current);
1414 current = next;
1415 }
1416 table[i] = NULL;
1417 }
1418 }
1420 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1421 LVT_Hash* entry = table[index];
1423 /*
1424 * 3-tuple start_bci/length/slot has to be unique key,
1425 * so the following comparison seems to be redundant:
1426 * && elem->name_cp_index == entry->_elem->name_cp_index
1427 */
1428 while (entry != NULL) {
1429 if (elem->start_bci == entry->_elem->start_bci
1430 && elem->length == entry->_elem->length
1431 && elem->name_cp_index == entry->_elem->name_cp_index
1432 && elem->slot == entry->_elem->slot
1433 ) {
1434 return entry;
1435 }
1436 entry = entry->_next;
1437 }
1438 return NULL;
1439 }
1441 // Return false if the local variable is found in table.
1442 // Return true if no duplicate is found.
1443 // And local variable is added as a new entry in table.
1444 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1445 // First lookup for duplicates
1446 int index = hash(elem);
1447 LVT_Hash* entry = LVT_lookup(elem, index, table);
1449 if (entry != NULL) {
1450 return false;
1451 }
1452 // No duplicate is found, allocate a new entry and fill it.
1453 if ((entry = new LVT_Hash()) == NULL) {
1454 return false;
1455 }
1456 entry->_elem = elem;
1458 // Insert into hash table
1459 entry->_next = table[index];
1460 table[index] = entry;
1462 return true;
1463 }
1465 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1466 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1467 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1468 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1469 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1470 lvt->signature_cp_index = 0;
1471 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1472 }
1474 // Function is used to parse both attributes:
1475 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1476 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1477 u2 max_locals,
1478 u4 code_attribute_length,
1479 u2* localvariable_table_length,
1480 bool isLVTT,
1481 TRAPS) {
1482 ClassFileStream* cfs = stream();
1483 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1484 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1485 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1486 // Verify local variable table attribute has right length
1487 if (_need_verify) {
1488 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1489 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1490 }
1491 u2* localvariable_table_start = cfs->get_u2_buffer();
1492 assert(localvariable_table_start != NULL, "null local variable table");
1493 if (!_need_verify) {
1494 cfs->skip_u2_fast(size);
1495 } else {
1496 cfs->guarantee_more(size * 2, CHECK_NULL);
1497 for(int i = 0; i < (*localvariable_table_length); i++) {
1498 u2 start_pc = cfs->get_u2_fast();
1499 u2 length = cfs->get_u2_fast();
1500 u2 name_index = cfs->get_u2_fast();
1501 u2 descriptor_index = cfs->get_u2_fast();
1502 u2 index = cfs->get_u2_fast();
1503 // Assign to a u4 to avoid overflow
1504 u4 end_pc = (u4)start_pc + (u4)length;
1506 if (start_pc >= code_length) {
1507 classfile_parse_error(
1508 "Invalid start_pc %u in %s in class file %s",
1509 start_pc, tbl_name, CHECK_NULL);
1510 }
1511 if (end_pc > code_length) {
1512 classfile_parse_error(
1513 "Invalid length %u in %s in class file %s",
1514 length, tbl_name, CHECK_NULL);
1515 }
1516 int cp_size = _cp->length();
1517 guarantee_property(valid_symbol_at(name_index),
1518 "Name index %u in %s has bad constant type in class file %s",
1519 name_index, tbl_name, CHECK_NULL);
1520 guarantee_property(valid_symbol_at(descriptor_index),
1521 "Signature index %u in %s has bad constant type in class file %s",
1522 descriptor_index, tbl_name, CHECK_NULL);
1524 Symbol* name = _cp->symbol_at(name_index);
1525 Symbol* sig = _cp->symbol_at(descriptor_index);
1526 verify_legal_field_name(name, CHECK_NULL);
1527 u2 extra_slot = 0;
1528 if (!isLVTT) {
1529 verify_legal_field_signature(name, sig, CHECK_NULL);
1531 // 4894874: check special cases for double and long local variables
1532 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1533 sig == vmSymbols::type_signature(T_LONG)) {
1534 extra_slot = 1;
1535 }
1536 }
1537 guarantee_property((index + extra_slot) < max_locals,
1538 "Invalid index %u in %s in class file %s",
1539 index, tbl_name, CHECK_NULL);
1540 }
1541 }
1542 return localvariable_table_start;
1543 }
1546 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1547 u1* u1_array, u2* u2_array, TRAPS) {
1548 ClassFileStream* cfs = stream();
1549 u2 index = 0; // index in the array with long/double occupying two slots
1550 u4 i1 = *u1_index;
1551 u4 i2 = *u2_index + 1;
1552 for(int i = 0; i < array_length; i++) {
1553 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1554 index++;
1555 if (tag == ITEM_Long || tag == ITEM_Double) {
1556 index++;
1557 } else if (tag == ITEM_Object) {
1558 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1559 guarantee_property(valid_klass_reference_at(class_index),
1560 "Bad class index %u in StackMap in class file %s",
1561 class_index, CHECK);
1562 } else if (tag == ITEM_Uninitialized) {
1563 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1564 guarantee_property(
1565 offset < code_length,
1566 "Bad uninitialized type offset %u in StackMap in class file %s",
1567 offset, CHECK);
1568 } else {
1569 guarantee_property(
1570 tag <= (u1)ITEM_Uninitialized,
1571 "Unknown variable type %u in StackMap in class file %s",
1572 tag, CHECK);
1573 }
1574 }
1575 u2_array[*u2_index] = index;
1576 *u1_index = i1;
1577 *u2_index = i2;
1578 }
1580 u1* ClassFileParser::parse_stackmap_table(
1581 u4 code_attribute_length, TRAPS) {
1582 if (code_attribute_length == 0)
1583 return NULL;
1585 ClassFileStream* cfs = stream();
1586 u1* stackmap_table_start = cfs->get_u1_buffer();
1587 assert(stackmap_table_start != NULL, "null stackmap table");
1589 // check code_attribute_length first
1590 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1592 if (!_need_verify && !DumpSharedSpaces) {
1593 return NULL;
1594 }
1595 return stackmap_table_start;
1596 }
1598 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1599 u4 method_attribute_length,
1600 TRAPS) {
1601 ClassFileStream* cfs = stream();
1602 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1603 *checked_exceptions_length = cfs->get_u2_fast();
1604 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1605 u2* checked_exceptions_start = cfs->get_u2_buffer();
1606 assert(checked_exceptions_start != NULL, "null checked exceptions");
1607 if (!_need_verify) {
1608 cfs->skip_u2_fast(size);
1609 } else {
1610 // Verify each value in the checked exception table
1611 u2 checked_exception;
1612 u2 len = *checked_exceptions_length;
1613 cfs->guarantee_more(2 * len, CHECK_NULL);
1614 for (int i = 0; i < len; i++) {
1615 checked_exception = cfs->get_u2_fast();
1616 check_property(
1617 valid_klass_reference_at(checked_exception),
1618 "Exception name has bad type at constant pool %u in class file %s",
1619 checked_exception, CHECK_NULL);
1620 }
1621 }
1622 // check exceptions attribute length
1623 if (_need_verify) {
1624 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1625 sizeof(u2) * size),
1626 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1627 }
1628 return checked_exceptions_start;
1629 }
1631 void ClassFileParser::throwIllegalSignature(
1632 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1633 ResourceMark rm(THREAD);
1634 Exceptions::fthrow(THREAD_AND_LOCATION,
1635 vmSymbols::java_lang_ClassFormatError(),
1636 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1637 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1638 }
1640 // Skip an annotation. Return >=limit if there is any problem.
1641 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1642 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1643 // value := switch (tag:u1) { ... }
1644 index += 2; // skip atype
1645 if ((index += 2) >= limit) return limit; // read nmem
1646 int nmem = Bytes::get_Java_u2(buffer+index-2);
1647 while (--nmem >= 0 && index < limit) {
1648 index += 2; // skip member
1649 index = skip_annotation_value(buffer, limit, index);
1650 }
1651 return index;
1652 }
1654 // Skip an annotation value. Return >=limit if there is any problem.
1655 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1656 // value := switch (tag:u1) {
1657 // case B, C, I, S, Z, D, F, J, c: con:u2;
1658 // case e: e_class:u2 e_name:u2;
1659 // case s: s_con:u2;
1660 // case [: do(nval:u2) {value};
1661 // case @: annotation;
1662 // case s: s_con:u2;
1663 // }
1664 if ((index += 1) >= limit) return limit; // read tag
1665 u1 tag = buffer[index-1];
1666 switch (tag) {
1667 case 'B': case 'C': case 'I': case 'S': case 'Z':
1668 case 'D': case 'F': case 'J': case 'c': case 's':
1669 index += 2; // skip con or s_con
1670 break;
1671 case 'e':
1672 index += 4; // skip e_class, e_name
1673 break;
1674 case '[':
1675 {
1676 if ((index += 2) >= limit) return limit; // read nval
1677 int nval = Bytes::get_Java_u2(buffer+index-2);
1678 while (--nval >= 0 && index < limit) {
1679 index = skip_annotation_value(buffer, limit, index);
1680 }
1681 }
1682 break;
1683 case '@':
1684 index = skip_annotation(buffer, limit, index);
1685 break;
1686 default:
1687 assert(false, "annotation tag");
1688 return limit; // bad tag byte
1689 }
1690 return index;
1691 }
1693 // Sift through annotations, looking for those significant to the VM:
1694 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1695 ClassFileParser::AnnotationCollector* coll,
1696 TRAPS) {
1697 // annotations := do(nann:u2) {annotation}
1698 int index = 0;
1699 if ((index += 2) >= limit) return; // read nann
1700 int nann = Bytes::get_Java_u2(buffer+index-2);
1701 enum { // initial annotation layout
1702 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1703 count_off = 2, // u2 such as 1 (one value)
1704 member_off = 4, // utf8 such as 'value'
1705 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1706 e_tag_val = 'e',
1707 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1708 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1709 e_size = 11, // end of 'e' annotation
1710 c_tag_val = 'c', // payload is type
1711 c_con_off = 7, // utf8 payload, such as 'I'
1712 c_size = 9, // end of 'c' annotation
1713 s_tag_val = 's', // payload is String
1714 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1715 s_size = 9,
1716 min_size = 6 // smallest possible size (zero members)
1717 };
1718 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1719 int index0 = index;
1720 index = skip_annotation(buffer, limit, index);
1721 u1* abase = buffer + index0;
1722 int atype = Bytes::get_Java_u2(abase + atype_off);
1723 int count = Bytes::get_Java_u2(abase + count_off);
1724 Symbol* aname = check_symbol_at(_cp, atype);
1725 if (aname == NULL) break; // invalid annotation name
1726 Symbol* member = NULL;
1727 if (count >= 1) {
1728 int member_index = Bytes::get_Java_u2(abase + member_off);
1729 member = check_symbol_at(_cp, member_index);
1730 if (member == NULL) break; // invalid member name
1731 }
1733 // Here is where parsing particular annotations will take place.
1734 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1735 if (id == AnnotationCollector::_unknown) continue;
1736 coll->set_annotation(id);
1738 if (id == AnnotationCollector::_sun_misc_Contended) {
1739 // @Contended can optionally specify the contention group.
1740 //
1741 // Contended group defines the equivalence class over the fields:
1742 // the fields within the same contended group are not treated distinct.
1743 // The only exception is default group, which does not incur the
1744 // equivalence. Naturally, contention group for classes is meaningless.
1745 //
1746 // While the contention group is specified as String, annotation
1747 // values are already interned, and we might as well use the constant
1748 // pool index as the group tag.
1749 //
1750 u2 group_index = 0; // default contended group
1751 if (count == 1
1752 && s_size == (index - index0) // match size
1753 && s_tag_val == *(abase + tag_off)
1754 && member == vmSymbols::value_name()) {
1755 group_index = Bytes::get_Java_u2(abase + s_con_off);
1756 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1757 group_index = 0; // default contended group
1758 }
1759 }
1760 coll->set_contended_group(group_index);
1761 }
1762 }
1763 }
1765 ClassFileParser::AnnotationCollector::ID
1766 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1767 Symbol* name) {
1768 vmSymbols::SID sid = vmSymbols::find_sid(name);
1769 // Privileged code can use all annotations. Other code silently drops some.
1770 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1771 loader_data->is_ext_class_loader_data() ||
1772 loader_data->is_anonymous();
1773 switch (sid) {
1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1775 if (_location != _in_method) break; // only allow for methods
1776 if (!privileged) break; // only allow in privileged code
1777 return _method_CallerSensitive;
1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1779 if (_location != _in_method) break; // only allow for methods
1780 if (!privileged) break; // only allow in privileged code
1781 return _method_ForceInline;
1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1783 if (_location != _in_method) break; // only allow for methods
1784 if (!privileged) break; // only allow in privileged code
1785 return _method_DontInline;
1786 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1787 if (_location != _in_method) break; // only allow for methods
1788 if (!privileged) break; // only allow in privileged code
1789 return _method_InjectedProfile;
1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1791 if (_location != _in_method) break; // only allow for methods
1792 if (!privileged) break; // only allow in privileged code
1793 return _method_LambdaForm_Compiled;
1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1795 if (_location != _in_method) break; // only allow for methods
1796 if (!privileged) break; // only allow in privileged code
1797 return _method_LambdaForm_Hidden;
1798 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1799 if (_location != _in_field) break; // only allow for fields
1800 if (!privileged) break; // only allow in privileged code
1801 return _field_Stable;
1802 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1803 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1804 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1805 return _sun_misc_Contended;
1806 default: break;
1807 }
1808 return AnnotationCollector::_unknown;
1809 }
1811 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1812 if (is_contended())
1813 f->set_contended_group(contended_group());
1814 if (is_stable())
1815 f->set_stable(true);
1816 }
1818 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1819 // If there's an error deallocate metadata for field annotations
1820 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1821 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1822 }
1824 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1825 if (has_annotation(_method_CallerSensitive))
1826 m->set_caller_sensitive(true);
1827 if (has_annotation(_method_ForceInline))
1828 m->set_force_inline(true);
1829 if (has_annotation(_method_DontInline))
1830 m->set_dont_inline(true);
1831 if (has_annotation(_method_InjectedProfile))
1832 m->set_has_injected_profile(true);
1833 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1834 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1835 if (has_annotation(_method_LambdaForm_Hidden))
1836 m->set_hidden(true);
1837 }
1839 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1840 k->set_is_contended(is_contended());
1841 }
1844 #define MAX_ARGS_SIZE 255
1845 #define MAX_CODE_SIZE 65535
1846 #define INITIAL_MAX_LVT_NUMBER 256
1848 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1849 *
1850 * Rules for LVT's and LVTT's are:
1851 * - There can be any number of LVT's and LVTT's.
1852 * - If there are n LVT's, it is the same as if there was just
1853 * one LVT containing all the entries from the n LVT's.
1854 * - There may be no more than one LVT entry per local variable.
1855 * Two LVT entries are 'equal' if these fields are the same:
1856 * start_pc, length, name, slot
1857 * - There may be no more than one LVTT entry per each LVT entry.
1858 * Each LVTT entry has to match some LVT entry.
1859 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1860 */
1861 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1862 int lvt_cnt,
1863 u2* localvariable_table_length,
1864 u2** localvariable_table_start,
1865 int lvtt_cnt,
1866 u2* localvariable_type_table_length,
1867 u2** localvariable_type_table_start,
1868 TRAPS) {
1870 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1871 initialize_hashtable(lvt_Hash);
1873 // To fill LocalVariableTable in
1874 Classfile_LVT_Element* cf_lvt;
1875 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1877 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1878 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1879 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1880 copy_lvt_element(&cf_lvt[idx], lvt);
1881 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1882 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1883 && _need_verify
1884 && _major_version >= JAVA_1_5_VERSION) {
1885 clear_hashtable(lvt_Hash);
1886 classfile_parse_error("Duplicated LocalVariableTable attribute "
1887 "entry for '%s' in class file %s",
1888 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1889 CHECK);
1890 }
1891 }
1892 }
1894 // To merge LocalVariableTable and LocalVariableTypeTable
1895 Classfile_LVT_Element* cf_lvtt;
1896 LocalVariableTableElement lvtt_elem;
1898 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1899 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1900 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1901 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1902 int index = hash(&lvtt_elem);
1903 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1904 if (entry == NULL) {
1905 if (_need_verify) {
1906 clear_hashtable(lvt_Hash);
1907 classfile_parse_error("LVTT entry for '%s' in class file %s "
1908 "does not match any LVT entry",
1909 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1910 CHECK);
1911 }
1912 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1913 clear_hashtable(lvt_Hash);
1914 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1915 "entry for '%s' in class file %s",
1916 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1917 CHECK);
1918 } else {
1919 // to add generic signatures into LocalVariableTable
1920 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1921 }
1922 }
1923 }
1924 clear_hashtable(lvt_Hash);
1925 }
1928 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1929 u1* runtime_visible_annotations,
1930 int runtime_visible_annotations_length,
1931 u1* runtime_invisible_annotations,
1932 int runtime_invisible_annotations_length,
1933 u1* runtime_visible_parameter_annotations,
1934 int runtime_visible_parameter_annotations_length,
1935 u1* runtime_invisible_parameter_annotations,
1936 int runtime_invisible_parameter_annotations_length,
1937 u1* runtime_visible_type_annotations,
1938 int runtime_visible_type_annotations_length,
1939 u1* runtime_invisible_type_annotations,
1940 int runtime_invisible_type_annotations_length,
1941 u1* annotation_default,
1942 int annotation_default_length,
1943 TRAPS) {
1945 AnnotationArray* a;
1947 if (runtime_visible_annotations_length +
1948 runtime_invisible_annotations_length > 0) {
1949 a = assemble_annotations(runtime_visible_annotations,
1950 runtime_visible_annotations_length,
1951 runtime_invisible_annotations,
1952 runtime_invisible_annotations_length,
1953 CHECK);
1954 cm->set_method_annotations(a);
1955 }
1957 if (runtime_visible_parameter_annotations_length +
1958 runtime_invisible_parameter_annotations_length > 0) {
1959 a = assemble_annotations(runtime_visible_parameter_annotations,
1960 runtime_visible_parameter_annotations_length,
1961 runtime_invisible_parameter_annotations,
1962 runtime_invisible_parameter_annotations_length,
1963 CHECK);
1964 cm->set_parameter_annotations(a);
1965 }
1967 if (annotation_default_length > 0) {
1968 a = assemble_annotations(annotation_default,
1969 annotation_default_length,
1970 NULL,
1971 0,
1972 CHECK);
1973 cm->set_default_annotations(a);
1974 }
1976 if (runtime_visible_type_annotations_length +
1977 runtime_invisible_type_annotations_length > 0) {
1978 a = assemble_annotations(runtime_visible_type_annotations,
1979 runtime_visible_type_annotations_length,
1980 runtime_invisible_type_annotations,
1981 runtime_invisible_type_annotations_length,
1982 CHECK);
1983 cm->set_type_annotations(a);
1984 }
1985 }
1988 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1989 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1990 // Method* to save footprint, so we only know the size of the resulting Method* when the
1991 // entire method attribute is parsed.
1992 //
1993 // The promoted_flags parameter is used to pass relevant access_flags
1994 // from the method back up to the containing klass. These flag values
1995 // are added to klass's access_flags.
1997 methodHandle ClassFileParser::parse_method(bool is_interface,
1998 AccessFlags *promoted_flags,
1999 TRAPS) {
2000 ClassFileStream* cfs = stream();
2001 methodHandle nullHandle;
2002 ResourceMark rm(THREAD);
2003 // Parse fixed parts
2004 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
2006 int flags = cfs->get_u2_fast();
2007 u2 name_index = cfs->get_u2_fast();
2008 int cp_size = _cp->length();
2009 check_property(
2010 valid_symbol_at(name_index),
2011 "Illegal constant pool index %u for method name in class file %s",
2012 name_index, CHECK_(nullHandle));
2013 Symbol* name = _cp->symbol_at(name_index);
2014 verify_legal_method_name(name, CHECK_(nullHandle));
2016 u2 signature_index = cfs->get_u2_fast();
2017 guarantee_property(
2018 valid_symbol_at(signature_index),
2019 "Illegal constant pool index %u for method signature in class file %s",
2020 signature_index, CHECK_(nullHandle));
2021 Symbol* signature = _cp->symbol_at(signature_index);
2023 AccessFlags access_flags;
2024 if (name == vmSymbols::class_initializer_name()) {
2025 // We ignore the other access flags for a valid class initializer.
2026 // (JVM Spec 2nd ed., chapter 4.6)
2027 if (_major_version < 51) { // backward compatibility
2028 flags = JVM_ACC_STATIC;
2029 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2030 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2031 }
2032 } else {
2033 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2034 }
2036 int args_size = -1; // only used when _need_verify is true
2037 if (_need_verify) {
2038 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2039 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2040 if (args_size > MAX_ARGS_SIZE) {
2041 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2042 }
2043 }
2045 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2047 // Default values for code and exceptions attribute elements
2048 u2 max_stack = 0;
2049 u2 max_locals = 0;
2050 u4 code_length = 0;
2051 u1* code_start = 0;
2052 u2 exception_table_length = 0;
2053 u2* exception_table_start = NULL;
2054 Array<int>* exception_handlers = Universe::the_empty_int_array();
2055 u2 checked_exceptions_length = 0;
2056 u2* checked_exceptions_start = NULL;
2057 CompressedLineNumberWriteStream* linenumber_table = NULL;
2058 int linenumber_table_length = 0;
2059 int total_lvt_length = 0;
2060 u2 lvt_cnt = 0;
2061 u2 lvtt_cnt = 0;
2062 bool lvt_allocated = false;
2063 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2064 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2065 u2* localvariable_table_length;
2066 u2** localvariable_table_start;
2067 u2* localvariable_type_table_length;
2068 u2** localvariable_type_table_start;
2069 u2 method_parameters_length = 0;
2070 u1* method_parameters_data = NULL;
2071 bool method_parameters_seen = false;
2072 bool parsed_code_attribute = false;
2073 bool parsed_checked_exceptions_attribute = false;
2074 bool parsed_stackmap_attribute = false;
2075 // stackmap attribute - JDK1.5
2076 u1* stackmap_data = NULL;
2077 int stackmap_data_length = 0;
2078 u2 generic_signature_index = 0;
2079 MethodAnnotationCollector parsed_annotations;
2080 u1* runtime_visible_annotations = NULL;
2081 int runtime_visible_annotations_length = 0;
2082 u1* runtime_invisible_annotations = NULL;
2083 int runtime_invisible_annotations_length = 0;
2084 u1* runtime_visible_parameter_annotations = NULL;
2085 int runtime_visible_parameter_annotations_length = 0;
2086 u1* runtime_invisible_parameter_annotations = NULL;
2087 int runtime_invisible_parameter_annotations_length = 0;
2088 u1* runtime_visible_type_annotations = NULL;
2089 int runtime_visible_type_annotations_length = 0;
2090 u1* runtime_invisible_type_annotations = NULL;
2091 int runtime_invisible_type_annotations_length = 0;
2092 bool runtime_invisible_type_annotations_exists = false;
2093 u1* annotation_default = NULL;
2094 int annotation_default_length = 0;
2096 // Parse code and exceptions attribute
2097 u2 method_attributes_count = cfs->get_u2_fast();
2098 while (method_attributes_count--) {
2099 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2100 u2 method_attribute_name_index = cfs->get_u2_fast();
2101 u4 method_attribute_length = cfs->get_u4_fast();
2102 check_property(
2103 valid_symbol_at(method_attribute_name_index),
2104 "Invalid method attribute name index %u in class file %s",
2105 method_attribute_name_index, CHECK_(nullHandle));
2107 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2108 if (method_attribute_name == vmSymbols::tag_code()) {
2109 // Parse Code attribute
2110 if (_need_verify) {
2111 guarantee_property(
2112 !access_flags.is_native() && !access_flags.is_abstract(),
2113 "Code attribute in native or abstract methods in class file %s",
2114 CHECK_(nullHandle));
2115 }
2116 if (parsed_code_attribute) {
2117 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2118 }
2119 parsed_code_attribute = true;
2121 // Stack size, locals size, and code size
2122 if (_major_version == 45 && _minor_version <= 2) {
2123 cfs->guarantee_more(4, CHECK_(nullHandle));
2124 max_stack = cfs->get_u1_fast();
2125 max_locals = cfs->get_u1_fast();
2126 code_length = cfs->get_u2_fast();
2127 } else {
2128 cfs->guarantee_more(8, CHECK_(nullHandle));
2129 max_stack = cfs->get_u2_fast();
2130 max_locals = cfs->get_u2_fast();
2131 code_length = cfs->get_u4_fast();
2132 }
2133 if (_need_verify) {
2134 guarantee_property(args_size <= max_locals,
2135 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2136 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2137 "Invalid method Code length %u in class file %s",
2138 code_length, CHECK_(nullHandle));
2139 }
2140 // Code pointer
2141 code_start = cfs->get_u1_buffer();
2142 assert(code_start != NULL, "null code start");
2143 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2144 cfs->skip_u1_fast(code_length);
2146 // Exception handler table
2147 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2148 exception_table_length = cfs->get_u2_fast();
2149 if (exception_table_length > 0) {
2150 exception_table_start =
2151 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2152 }
2154 // Parse additional attributes in code attribute
2155 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2156 u2 code_attributes_count = cfs->get_u2_fast();
2158 unsigned int calculated_attribute_length = 0;
2160 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2161 calculated_attribute_length =
2162 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2163 } else {
2164 // max_stack, locals and length are smaller in pre-version 45.2 classes
2165 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2166 }
2167 calculated_attribute_length +=
2168 code_length +
2169 sizeof(exception_table_length) +
2170 sizeof(code_attributes_count) +
2171 exception_table_length *
2172 ( sizeof(u2) + // start_pc
2173 sizeof(u2) + // end_pc
2174 sizeof(u2) + // handler_pc
2175 sizeof(u2) ); // catch_type_index
2177 while (code_attributes_count--) {
2178 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2179 u2 code_attribute_name_index = cfs->get_u2_fast();
2180 u4 code_attribute_length = cfs->get_u4_fast();
2181 calculated_attribute_length += code_attribute_length +
2182 sizeof(code_attribute_name_index) +
2183 sizeof(code_attribute_length);
2184 check_property(valid_symbol_at(code_attribute_name_index),
2185 "Invalid code attribute name index %u in class file %s",
2186 code_attribute_name_index,
2187 CHECK_(nullHandle));
2188 if (LoadLineNumberTables &&
2189 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2190 // Parse and compress line number table
2191 parse_linenumber_table(code_attribute_length, code_length,
2192 &linenumber_table, CHECK_(nullHandle));
2194 } else if (LoadLocalVariableTables &&
2195 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2196 // Parse local variable table
2197 if (!lvt_allocated) {
2198 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2199 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2200 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2201 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2202 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2203 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2204 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2206 lvt_allocated = true;
2207 }
2208 if (lvt_cnt == max_lvt_cnt) {
2209 max_lvt_cnt <<= 1;
2210 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2211 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2212 }
2213 localvariable_table_start[lvt_cnt] =
2214 parse_localvariable_table(code_length,
2215 max_locals,
2216 code_attribute_length,
2217 &localvariable_table_length[lvt_cnt],
2218 false, // is not LVTT
2219 CHECK_(nullHandle));
2220 total_lvt_length += localvariable_table_length[lvt_cnt];
2221 lvt_cnt++;
2222 } else if (LoadLocalVariableTypeTables &&
2223 _major_version >= JAVA_1_5_VERSION &&
2224 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2225 if (!lvt_allocated) {
2226 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2227 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2228 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2229 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2230 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2231 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2232 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2233 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2234 lvt_allocated = true;
2235 }
2236 // Parse local variable type table
2237 if (lvtt_cnt == max_lvtt_cnt) {
2238 max_lvtt_cnt <<= 1;
2239 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2240 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2241 }
2242 localvariable_type_table_start[lvtt_cnt] =
2243 parse_localvariable_table(code_length,
2244 max_locals,
2245 code_attribute_length,
2246 &localvariable_type_table_length[lvtt_cnt],
2247 true, // is LVTT
2248 CHECK_(nullHandle));
2249 lvtt_cnt++;
2250 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2251 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2252 // Stack map is only needed by the new verifier in JDK1.5.
2253 if (parsed_stackmap_attribute) {
2254 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2255 }
2256 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2257 stackmap_data_length = code_attribute_length;
2258 parsed_stackmap_attribute = true;
2259 } else {
2260 // Skip unknown attributes
2261 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2262 }
2263 }
2264 // check method attribute length
2265 if (_need_verify) {
2266 guarantee_property(method_attribute_length == calculated_attribute_length,
2267 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2268 }
2269 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2270 // Parse Exceptions attribute
2271 if (parsed_checked_exceptions_attribute) {
2272 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2273 }
2274 parsed_checked_exceptions_attribute = true;
2275 checked_exceptions_start =
2276 parse_checked_exceptions(&checked_exceptions_length,
2277 method_attribute_length,
2278 CHECK_(nullHandle));
2279 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2280 // reject multiple method parameters
2281 if (method_parameters_seen) {
2282 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2283 }
2284 method_parameters_seen = true;
2285 method_parameters_length = cfs->get_u1_fast();
2286 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2287 classfile_parse_error(
2288 "Invalid MethodParameters method attribute length %u in class file",
2289 method_attribute_length, CHECK_(nullHandle));
2290 }
2291 method_parameters_data = cfs->get_u1_buffer();
2292 cfs->skip_u2_fast(method_parameters_length);
2293 cfs->skip_u2_fast(method_parameters_length);
2294 // ignore this attribute if it cannot be reflected
2295 if (!SystemDictionary::Parameter_klass_loaded())
2296 method_parameters_length = 0;
2297 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2298 if (method_attribute_length != 0) {
2299 classfile_parse_error(
2300 "Invalid Synthetic method attribute length %u in class file %s",
2301 method_attribute_length, CHECK_(nullHandle));
2302 }
2303 // Should we check that there hasn't already been a synthetic attribute?
2304 access_flags.set_is_synthetic();
2305 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2306 if (method_attribute_length != 0) {
2307 classfile_parse_error(
2308 "Invalid Deprecated method attribute length %u in class file %s",
2309 method_attribute_length, CHECK_(nullHandle));
2310 }
2311 } else if (_major_version >= JAVA_1_5_VERSION) {
2312 if (method_attribute_name == vmSymbols::tag_signature()) {
2313 if (method_attribute_length != 2) {
2314 classfile_parse_error(
2315 "Invalid Signature attribute length %u in class file %s",
2316 method_attribute_length, CHECK_(nullHandle));
2317 }
2318 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2319 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2320 runtime_visible_annotations_length = method_attribute_length;
2321 runtime_visible_annotations = cfs->get_u1_buffer();
2322 assert(runtime_visible_annotations != NULL, "null visible annotations");
2323 parse_annotations(runtime_visible_annotations,
2324 runtime_visible_annotations_length, &parsed_annotations,
2325 CHECK_(nullHandle));
2326 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2327 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2328 runtime_invisible_annotations_length = method_attribute_length;
2329 runtime_invisible_annotations = cfs->get_u1_buffer();
2330 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2331 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2332 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2333 runtime_visible_parameter_annotations_length = method_attribute_length;
2334 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2335 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2336 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2337 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2338 runtime_invisible_parameter_annotations_length = method_attribute_length;
2339 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2340 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2341 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2342 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2343 annotation_default_length = method_attribute_length;
2344 annotation_default = cfs->get_u1_buffer();
2345 assert(annotation_default != NULL, "null annotation default");
2346 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2347 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2348 if (runtime_visible_type_annotations != NULL) {
2349 classfile_parse_error(
2350 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2351 CHECK_(nullHandle));
2352 }
2353 runtime_visible_type_annotations_length = method_attribute_length;
2354 runtime_visible_type_annotations = cfs->get_u1_buffer();
2355 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2356 // No need for the VM to parse Type annotations
2357 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2358 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2359 if (runtime_invisible_type_annotations_exists) {
2360 classfile_parse_error(
2361 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2362 CHECK_(nullHandle));
2363 } else {
2364 runtime_invisible_type_annotations_exists = true;
2365 }
2366 if (PreserveAllAnnotations) {
2367 runtime_invisible_type_annotations_length = method_attribute_length;
2368 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2369 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2370 }
2371 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2372 } else {
2373 // Skip unknown attributes
2374 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2375 }
2376 } else {
2377 // Skip unknown attributes
2378 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2379 }
2380 }
2382 if (linenumber_table != NULL) {
2383 linenumber_table->write_terminator();
2384 linenumber_table_length = linenumber_table->position();
2385 }
2387 // Make sure there's at least one Code attribute in non-native/non-abstract method
2388 if (_need_verify) {
2389 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2390 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2391 }
2393 // All sizing information for a Method* is finally available, now create it
2394 InlineTableSizes sizes(
2395 total_lvt_length,
2396 linenumber_table_length,
2397 exception_table_length,
2398 checked_exceptions_length,
2399 method_parameters_length,
2400 generic_signature_index,
2401 runtime_visible_annotations_length +
2402 runtime_invisible_annotations_length,
2403 runtime_visible_parameter_annotations_length +
2404 runtime_invisible_parameter_annotations_length,
2405 runtime_visible_type_annotations_length +
2406 runtime_invisible_type_annotations_length,
2407 annotation_default_length,
2408 0);
2410 Method* m = Method::allocate(
2411 _loader_data, code_length, access_flags, &sizes,
2412 ConstMethod::NORMAL, CHECK_(nullHandle));
2414 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2416 // Fill in information from fixed part (access_flags already set)
2417 m->set_constants(_cp);
2418 m->set_name_index(name_index);
2419 m->set_signature_index(signature_index);
2421 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2422 m->constMethod()->set_result_type(rtf.type());
2424 if (args_size >= 0) {
2425 m->set_size_of_parameters(args_size);
2426 } else {
2427 m->compute_size_of_parameters(THREAD);
2428 }
2429 #ifdef ASSERT
2430 if (args_size >= 0) {
2431 m->compute_size_of_parameters(THREAD);
2432 assert(args_size == m->size_of_parameters(), "");
2433 }
2434 #endif
2436 // Fill in code attribute information
2437 m->set_max_stack(max_stack);
2438 m->set_max_locals(max_locals);
2439 if (stackmap_data != NULL) {
2440 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2441 stackmap_data_length, CHECK_NULL);
2442 }
2444 // Copy byte codes
2445 m->set_code(code_start);
2447 // Copy line number table
2448 if (linenumber_table != NULL) {
2449 memcpy(m->compressed_linenumber_table(),
2450 linenumber_table->buffer(), linenumber_table_length);
2451 }
2453 // Copy exception table
2454 if (exception_table_length > 0) {
2455 int size =
2456 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2457 copy_u2_with_conversion((u2*) m->exception_table_start(),
2458 exception_table_start, size);
2459 }
2461 // Copy method parameters
2462 if (method_parameters_length > 0) {
2463 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2464 for (int i = 0; i < method_parameters_length; i++) {
2465 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2466 method_parameters_data += 2;
2467 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2468 method_parameters_data += 2;
2469 }
2470 }
2472 // Copy checked exceptions
2473 if (checked_exceptions_length > 0) {
2474 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2475 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2476 }
2478 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2479 if (total_lvt_length > 0) {
2480 promoted_flags->set_has_localvariable_table();
2481 copy_localvariable_table(m->constMethod(), lvt_cnt,
2482 localvariable_table_length,
2483 localvariable_table_start,
2484 lvtt_cnt,
2485 localvariable_type_table_length,
2486 localvariable_type_table_start, CHECK_NULL);
2487 }
2489 if (parsed_annotations.has_any_annotations())
2490 parsed_annotations.apply_to(m);
2492 // Copy annotations
2493 copy_method_annotations(m->constMethod(),
2494 runtime_visible_annotations,
2495 runtime_visible_annotations_length,
2496 runtime_invisible_annotations,
2497 runtime_invisible_annotations_length,
2498 runtime_visible_parameter_annotations,
2499 runtime_visible_parameter_annotations_length,
2500 runtime_invisible_parameter_annotations,
2501 runtime_invisible_parameter_annotations_length,
2502 runtime_visible_type_annotations,
2503 runtime_visible_type_annotations_length,
2504 runtime_invisible_type_annotations,
2505 runtime_invisible_type_annotations_length,
2506 annotation_default,
2507 annotation_default_length,
2508 CHECK_NULL);
2510 if (name == vmSymbols::finalize_method_name() &&
2511 signature == vmSymbols::void_method_signature()) {
2512 if (m->is_empty_method()) {
2513 _has_empty_finalizer = true;
2514 } else {
2515 _has_finalizer = true;
2516 }
2517 }
2518 if (name == vmSymbols::object_initializer_name() &&
2519 signature == vmSymbols::void_method_signature() &&
2520 m->is_vanilla_constructor()) {
2521 _has_vanilla_constructor = true;
2522 }
2524 NOT_PRODUCT(m->verify());
2525 return m;
2526 }
2529 // The promoted_flags parameter is used to pass relevant access_flags
2530 // from the methods back up to the containing klass. These flag values
2531 // are added to klass's access_flags.
2533 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2534 AccessFlags* promoted_flags,
2535 bool* has_final_method,
2536 bool* declares_default_methods,
2537 TRAPS) {
2538 ClassFileStream* cfs = stream();
2539 cfs->guarantee_more(2, CHECK_NULL); // length
2540 u2 length = cfs->get_u2_fast();
2541 if (length == 0) {
2542 _methods = Universe::the_empty_method_array();
2543 } else {
2544 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2546 HandleMark hm(THREAD);
2547 for (int index = 0; index < length; index++) {
2548 methodHandle method = parse_method(is_interface,
2549 promoted_flags,
2550 CHECK_NULL);
2552 if (method->is_final()) {
2553 *has_final_method = true;
2554 }
2555 // declares_default_methods: declares concrete instance methods, any access flags
2556 // used for interface initialization, and default method inheritance analysis
2557 if (is_interface && !(*declares_default_methods)
2558 && !method->is_abstract() && !method->is_static()) {
2559 *declares_default_methods = true;
2560 }
2561 _methods->at_put(index, method());
2562 }
2564 if (_need_verify && length > 1) {
2565 // Check duplicated methods
2566 ResourceMark rm(THREAD);
2567 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2568 THREAD, NameSigHash*, HASH_ROW_SIZE);
2569 initialize_hashtable(names_and_sigs);
2570 bool dup = false;
2571 {
2572 debug_only(No_Safepoint_Verifier nsv;)
2573 for (int i = 0; i < length; i++) {
2574 Method* m = _methods->at(i);
2575 // If no duplicates, add name/signature in hashtable names_and_sigs.
2576 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2577 dup = true;
2578 break;
2579 }
2580 }
2581 }
2582 if (dup) {
2583 classfile_parse_error("Duplicate method name&signature in class file %s",
2584 CHECK_NULL);
2585 }
2586 }
2587 }
2588 return _methods;
2589 }
2592 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2593 int length = methods->length();
2594 // If JVMTI original method ordering or sharing is enabled we have to
2595 // remember the original class file ordering.
2596 // We temporarily use the vtable_index field in the Method* to store the
2597 // class file index, so we can read in after calling qsort.
2598 // Put the method ordering in the shared archive.
2599 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2600 for (int index = 0; index < length; index++) {
2601 Method* m = methods->at(index);
2602 assert(!m->valid_vtable_index(), "vtable index should not be set");
2603 m->set_vtable_index(index);
2604 }
2605 }
2606 // Sort method array by ascending method name (for faster lookups & vtable construction)
2607 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2608 Method::sort_methods(methods);
2610 intArray* method_ordering = NULL;
2611 // If JVMTI original method ordering or sharing is enabled construct int
2612 // array remembering the original ordering
2613 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2614 method_ordering = new intArray(length);
2615 for (int index = 0; index < length; index++) {
2616 Method* m = methods->at(index);
2617 int old_index = m->vtable_index();
2618 assert(old_index >= 0 && old_index < length, "invalid method index");
2619 method_ordering->at_put(index, old_index);
2620 m->set_vtable_index(Method::invalid_vtable_index);
2621 }
2622 }
2623 return method_ordering;
2624 }
2626 // Parse generic_signature attribute for methods and fields
2627 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2628 ClassFileStream* cfs = stream();
2629 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2630 u2 generic_signature_index = cfs->get_u2_fast();
2631 check_property(
2632 valid_symbol_at(generic_signature_index),
2633 "Invalid Signature attribute at constant pool index %u in class file %s",
2634 generic_signature_index, CHECK_0);
2635 return generic_signature_index;
2636 }
2638 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2639 ClassFileStream* cfs = stream();
2640 cfs->guarantee_more(2, CHECK); // sourcefile_index
2641 u2 sourcefile_index = cfs->get_u2_fast();
2642 check_property(
2643 valid_symbol_at(sourcefile_index),
2644 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2645 sourcefile_index, CHECK);
2646 set_class_sourcefile_index(sourcefile_index);
2647 }
2651 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2652 ClassFileStream* cfs = stream();
2653 u1* sde_buffer = cfs->get_u1_buffer();
2654 assert(sde_buffer != NULL, "null sde buffer");
2656 // Don't bother storing it if there is no way to retrieve it
2657 if (JvmtiExport::can_get_source_debug_extension()) {
2658 assert((length+1) > length, "Overflow checking");
2659 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2660 for (int i = 0; i < length; i++) {
2661 sde[i] = sde_buffer[i];
2662 }
2663 sde[length] = '\0';
2664 set_class_sde_buffer((char*)sde, length);
2665 }
2666 // Got utf8 string, set stream position forward
2667 cfs->skip_u1(length, CHECK);
2668 }
2671 // Inner classes can be static, private or protected (classic VM does this)
2672 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2674 // Return number of classes in the inner classes attribute table
2675 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2676 bool parsed_enclosingmethod_attribute,
2677 u2 enclosing_method_class_index,
2678 u2 enclosing_method_method_index,
2679 TRAPS) {
2680 ClassFileStream* cfs = stream();
2681 u1* current_mark = cfs->current();
2682 u2 length = 0;
2683 if (inner_classes_attribute_start != NULL) {
2684 cfs->set_current(inner_classes_attribute_start);
2685 cfs->guarantee_more(2, CHECK_0); // length
2686 length = cfs->get_u2_fast();
2687 }
2689 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2690 // method data:
2691 // [inner_class_info_index,
2692 // outer_class_info_index,
2693 // inner_name_index,
2694 // inner_class_access_flags,
2695 // ...
2696 // enclosing_method_class_index,
2697 // enclosing_method_method_index]
2698 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2699 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2700 _inner_classes = inner_classes;
2702 int index = 0;
2703 int cp_size = _cp->length();
2704 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2705 for (int n = 0; n < length; n++) {
2706 // Inner class index
2707 u2 inner_class_info_index = cfs->get_u2_fast();
2708 check_property(
2709 inner_class_info_index == 0 ||
2710 valid_klass_reference_at(inner_class_info_index),
2711 "inner_class_info_index %u has bad constant type in class file %s",
2712 inner_class_info_index, CHECK_0);
2713 // Outer class index
2714 u2 outer_class_info_index = cfs->get_u2_fast();
2715 check_property(
2716 outer_class_info_index == 0 ||
2717 valid_klass_reference_at(outer_class_info_index),
2718 "outer_class_info_index %u has bad constant type in class file %s",
2719 outer_class_info_index, CHECK_0);
2720 // Inner class name
2721 u2 inner_name_index = cfs->get_u2_fast();
2722 check_property(
2723 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2724 "inner_name_index %u has bad constant type in class file %s",
2725 inner_name_index, CHECK_0);
2726 if (_need_verify) {
2727 guarantee_property(inner_class_info_index != outer_class_info_index,
2728 "Class is both outer and inner class in class file %s", CHECK_0);
2729 }
2730 // Access flags
2731 AccessFlags inner_access_flags;
2732 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2733 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2734 // Set abstract bit for old class files for backward compatibility
2735 flags |= JVM_ACC_ABSTRACT;
2736 }
2737 verify_legal_class_modifiers(flags, CHECK_0);
2738 inner_access_flags.set_flags(flags);
2740 inner_classes->at_put(index++, inner_class_info_index);
2741 inner_classes->at_put(index++, outer_class_info_index);
2742 inner_classes->at_put(index++, inner_name_index);
2743 inner_classes->at_put(index++, inner_access_flags.as_short());
2744 }
2746 // 4347400: make sure there's no duplicate entry in the classes array
2747 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2748 for(int i = 0; i < length * 4; i += 4) {
2749 for(int j = i + 4; j < length * 4; j += 4) {
2750 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2751 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2752 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2753 inner_classes->at(i+3) != inner_classes->at(j+3)),
2754 "Duplicate entry in InnerClasses in class file %s",
2755 CHECK_0);
2756 }
2757 }
2758 }
2760 // Set EnclosingMethod class and method indexes.
2761 if (parsed_enclosingmethod_attribute) {
2762 inner_classes->at_put(index++, enclosing_method_class_index);
2763 inner_classes->at_put(index++, enclosing_method_method_index);
2764 }
2765 assert(index == size, "wrong size");
2767 // Restore buffer's current position.
2768 cfs->set_current(current_mark);
2770 return length;
2771 }
2773 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2774 set_class_synthetic_flag(true);
2775 }
2777 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2778 ClassFileStream* cfs = stream();
2779 u2 signature_index = cfs->get_u2(CHECK);
2780 check_property(
2781 valid_symbol_at(signature_index),
2782 "Invalid constant pool index %u in Signature attribute in class file %s",
2783 signature_index, CHECK);
2784 set_class_generic_signature_index(signature_index);
2785 }
2787 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2788 ClassFileStream* cfs = stream();
2789 u1* current_start = cfs->current();
2791 guarantee_property(attribute_byte_length >= sizeof(u2),
2792 "Invalid BootstrapMethods attribute length %u in class file %s",
2793 attribute_byte_length,
2794 CHECK);
2796 cfs->guarantee_more(attribute_byte_length, CHECK);
2798 int attribute_array_length = cfs->get_u2_fast();
2800 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2801 "Short length on BootstrapMethods in class file %s",
2802 CHECK);
2804 // The attribute contains a counted array of counted tuples of shorts,
2805 // represending bootstrap specifiers:
2806 // length*{bootstrap_method_index, argument_count*{argument_index}}
2807 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2808 // operand_count = number of shorts in attr, except for leading length
2810 // The attribute is copied into a short[] array.
2811 // The array begins with a series of short[2] pairs, one for each tuple.
2812 int index_size = (attribute_array_length * 2);
2814 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2816 // Eagerly assign operands so they will be deallocated with the constant
2817 // pool if there is an error.
2818 _cp->set_operands(operands);
2820 int operand_fill_index = index_size;
2821 int cp_size = _cp->length();
2823 for (int n = 0; n < attribute_array_length; n++) {
2824 // Store a 32-bit offset into the header of the operand array.
2825 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2827 // Read a bootstrap specifier.
2828 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2829 u2 bootstrap_method_index = cfs->get_u2_fast();
2830 u2 argument_count = cfs->get_u2_fast();
2831 check_property(
2832 valid_cp_range(bootstrap_method_index, cp_size) &&
2833 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2834 "bootstrap_method_index %u has bad constant type in class file %s",
2835 bootstrap_method_index,
2836 CHECK);
2838 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2839 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2840 CHECK);
2842 operands->at_put(operand_fill_index++, bootstrap_method_index);
2843 operands->at_put(operand_fill_index++, argument_count);
2845 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2846 for (int j = 0; j < argument_count; j++) {
2847 u2 argument_index = cfs->get_u2_fast();
2848 check_property(
2849 valid_cp_range(argument_index, cp_size) &&
2850 _cp->tag_at(argument_index).is_loadable_constant(),
2851 "argument_index %u has bad constant type in class file %s",
2852 argument_index,
2853 CHECK);
2854 operands->at_put(operand_fill_index++, argument_index);
2855 }
2856 }
2858 assert(operand_fill_index == operands->length(), "exact fill");
2860 u1* current_end = cfs->current();
2861 guarantee_property(current_end == current_start + attribute_byte_length,
2862 "Bad length on BootstrapMethods in class file %s",
2863 CHECK);
2864 }
2866 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2867 TRAPS) {
2868 ClassFileStream* cfs = stream();
2869 // Set inner classes attribute to default sentinel
2870 _inner_classes = Universe::the_empty_short_array();
2871 cfs->guarantee_more(2, CHECK); // attributes_count
2872 u2 attributes_count = cfs->get_u2_fast();
2873 bool parsed_sourcefile_attribute = false;
2874 bool parsed_innerclasses_attribute = false;
2875 bool parsed_enclosingmethod_attribute = false;
2876 bool parsed_bootstrap_methods_attribute = false;
2877 u1* runtime_visible_annotations = NULL;
2878 int runtime_visible_annotations_length = 0;
2879 u1* runtime_invisible_annotations = NULL;
2880 int runtime_invisible_annotations_length = 0;
2881 u1* runtime_visible_type_annotations = NULL;
2882 int runtime_visible_type_annotations_length = 0;
2883 u1* runtime_invisible_type_annotations = NULL;
2884 int runtime_invisible_type_annotations_length = 0;
2885 bool runtime_invisible_type_annotations_exists = false;
2886 u1* inner_classes_attribute_start = NULL;
2887 u4 inner_classes_attribute_length = 0;
2888 u2 enclosing_method_class_index = 0;
2889 u2 enclosing_method_method_index = 0;
2890 // Iterate over attributes
2891 while (attributes_count--) {
2892 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2893 u2 attribute_name_index = cfs->get_u2_fast();
2894 u4 attribute_length = cfs->get_u4_fast();
2895 check_property(
2896 valid_symbol_at(attribute_name_index),
2897 "Attribute name has bad constant pool index %u in class file %s",
2898 attribute_name_index, CHECK);
2899 Symbol* tag = _cp->symbol_at(attribute_name_index);
2900 if (tag == vmSymbols::tag_source_file()) {
2901 // Check for SourceFile tag
2902 if (_need_verify) {
2903 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2904 }
2905 if (parsed_sourcefile_attribute) {
2906 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2907 } else {
2908 parsed_sourcefile_attribute = true;
2909 }
2910 parse_classfile_sourcefile_attribute(CHECK);
2911 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2912 // Check for SourceDebugExtension tag
2913 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2914 } else if (tag == vmSymbols::tag_inner_classes()) {
2915 // Check for InnerClasses tag
2916 if (parsed_innerclasses_attribute) {
2917 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2918 } else {
2919 parsed_innerclasses_attribute = true;
2920 }
2921 inner_classes_attribute_start = cfs->get_u1_buffer();
2922 inner_classes_attribute_length = attribute_length;
2923 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2924 } else if (tag == vmSymbols::tag_synthetic()) {
2925 // Check for Synthetic tag
2926 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2927 if (attribute_length != 0) {
2928 classfile_parse_error(
2929 "Invalid Synthetic classfile attribute length %u in class file %s",
2930 attribute_length, CHECK);
2931 }
2932 parse_classfile_synthetic_attribute(CHECK);
2933 } else if (tag == vmSymbols::tag_deprecated()) {
2934 // Check for Deprecatd tag - 4276120
2935 if (attribute_length != 0) {
2936 classfile_parse_error(
2937 "Invalid Deprecated classfile attribute length %u in class file %s",
2938 attribute_length, CHECK);
2939 }
2940 } else if (_major_version >= JAVA_1_5_VERSION) {
2941 if (tag == vmSymbols::tag_signature()) {
2942 if (attribute_length != 2) {
2943 classfile_parse_error(
2944 "Wrong Signature attribute length %u in class file %s",
2945 attribute_length, CHECK);
2946 }
2947 parse_classfile_signature_attribute(CHECK);
2948 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2949 runtime_visible_annotations_length = attribute_length;
2950 runtime_visible_annotations = cfs->get_u1_buffer();
2951 assert(runtime_visible_annotations != NULL, "null visible annotations");
2952 parse_annotations(runtime_visible_annotations,
2953 runtime_visible_annotations_length,
2954 parsed_annotations,
2955 CHECK);
2956 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2957 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2958 runtime_invisible_annotations_length = attribute_length;
2959 runtime_invisible_annotations = cfs->get_u1_buffer();
2960 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2961 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2962 } else if (tag == vmSymbols::tag_enclosing_method()) {
2963 if (parsed_enclosingmethod_attribute) {
2964 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2965 } else {
2966 parsed_enclosingmethod_attribute = true;
2967 }
2968 cfs->guarantee_more(4, CHECK); // class_index, method_index
2969 enclosing_method_class_index = cfs->get_u2_fast();
2970 enclosing_method_method_index = cfs->get_u2_fast();
2971 if (enclosing_method_class_index == 0) {
2972 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2973 }
2974 // Validate the constant pool indices and types
2975 check_property(valid_klass_reference_at(enclosing_method_class_index),
2976 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2977 if (enclosing_method_method_index != 0 &&
2978 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2979 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2980 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2981 }
2982 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2983 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2984 if (parsed_bootstrap_methods_attribute)
2985 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2986 parsed_bootstrap_methods_attribute = true;
2987 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2988 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2989 if (runtime_visible_type_annotations != NULL) {
2990 classfile_parse_error(
2991 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
2992 }
2993 runtime_visible_type_annotations_length = attribute_length;
2994 runtime_visible_type_annotations = cfs->get_u1_buffer();
2995 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2996 // No need for the VM to parse Type annotations
2997 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2998 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2999 if (runtime_invisible_type_annotations_exists) {
3000 classfile_parse_error(
3001 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3002 } else {
3003 runtime_invisible_type_annotations_exists = true;
3004 }
3005 if (PreserveAllAnnotations) {
3006 runtime_invisible_type_annotations_length = attribute_length;
3007 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3008 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3009 }
3010 cfs->skip_u1(attribute_length, CHECK);
3011 } else {
3012 // Unknown attribute
3013 cfs->skip_u1(attribute_length, CHECK);
3014 }
3015 } else {
3016 // Unknown attribute
3017 cfs->skip_u1(attribute_length, CHECK);
3018 }
3019 }
3020 _annotations = assemble_annotations(runtime_visible_annotations,
3021 runtime_visible_annotations_length,
3022 runtime_invisible_annotations,
3023 runtime_invisible_annotations_length,
3024 CHECK);
3025 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3026 runtime_visible_type_annotations_length,
3027 runtime_invisible_type_annotations,
3028 runtime_invisible_type_annotations_length,
3029 CHECK);
3031 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3032 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3033 inner_classes_attribute_start,
3034 parsed_innerclasses_attribute,
3035 enclosing_method_class_index,
3036 enclosing_method_method_index,
3037 CHECK);
3038 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3039 guarantee_property(
3040 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3041 "Wrong InnerClasses attribute length in class file %s", CHECK);
3042 }
3043 }
3045 if (_max_bootstrap_specifier_index >= 0) {
3046 guarantee_property(parsed_bootstrap_methods_attribute,
3047 "Missing BootstrapMethods attribute in class file %s", CHECK);
3048 }
3049 }
3051 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3052 if (_synthetic_flag)
3053 k->set_is_synthetic();
3054 if (_sourcefile_index != 0) {
3055 k->set_source_file_name_index(_sourcefile_index);
3056 }
3057 if (_generic_signature_index != 0) {
3058 k->set_generic_signature_index(_generic_signature_index);
3059 }
3060 if (_sde_buffer != NULL) {
3061 k->set_source_debug_extension(_sde_buffer, _sde_length);
3062 }
3063 }
3065 // Create the Annotations object that will
3066 // hold the annotations array for the Klass.
3067 void ClassFileParser::create_combined_annotations(TRAPS) {
3068 if (_annotations == NULL &&
3069 _type_annotations == NULL &&
3070 _fields_annotations == NULL &&
3071 _fields_type_annotations == NULL) {
3072 // Don't create the Annotations object unnecessarily.
3073 return;
3074 }
3076 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3077 annotations->set_class_annotations(_annotations);
3078 annotations->set_class_type_annotations(_type_annotations);
3079 annotations->set_fields_annotations(_fields_annotations);
3080 annotations->set_fields_type_annotations(_fields_type_annotations);
3082 // This is the Annotations object that will be
3083 // assigned to InstanceKlass being constructed.
3084 _combined_annotations = annotations;
3086 // The annotations arrays below has been transfered the
3087 // _combined_annotations so these fields can now be cleared.
3088 _annotations = NULL;
3089 _type_annotations = NULL;
3090 _fields_annotations = NULL;
3091 _fields_type_annotations = NULL;
3092 }
3094 // Transfer ownership of metadata allocated to the InstanceKlass.
3095 void ClassFileParser::apply_parsed_class_metadata(
3096 instanceKlassHandle this_klass,
3097 int java_fields_count, TRAPS) {
3098 _cp->set_pool_holder(this_klass());
3099 this_klass->set_constants(_cp);
3100 this_klass->set_fields(_fields, java_fields_count);
3101 this_klass->set_methods(_methods);
3102 this_klass->set_inner_classes(_inner_classes);
3103 this_klass->set_local_interfaces(_local_interfaces);
3104 this_klass->set_transitive_interfaces(_transitive_interfaces);
3105 this_klass->set_annotations(_combined_annotations);
3107 // Clear out these fields so they don't get deallocated by the destructor
3108 clear_class_metadata();
3109 }
3111 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3112 int runtime_visible_annotations_length,
3113 u1* runtime_invisible_annotations,
3114 int runtime_invisible_annotations_length, TRAPS) {
3115 AnnotationArray* annotations = NULL;
3116 if (runtime_visible_annotations != NULL ||
3117 runtime_invisible_annotations != NULL) {
3118 annotations = MetadataFactory::new_array<u1>(_loader_data,
3119 runtime_visible_annotations_length +
3120 runtime_invisible_annotations_length,
3121 CHECK_(annotations));
3122 if (runtime_visible_annotations != NULL) {
3123 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3124 annotations->at_put(i, runtime_visible_annotations[i]);
3125 }
3126 }
3127 if (runtime_invisible_annotations != NULL) {
3128 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3129 int append = runtime_visible_annotations_length+i;
3130 annotations->at_put(append, runtime_invisible_annotations[i]);
3131 }
3132 }
3133 }
3134 return annotations;
3135 }
3137 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3138 TRAPS) {
3139 instanceKlassHandle super_klass;
3140 if (super_class_index == 0) {
3141 check_property(_class_name == vmSymbols::java_lang_Object(),
3142 "Invalid superclass index %u in class file %s",
3143 super_class_index,
3144 CHECK_NULL);
3145 } else {
3146 check_property(valid_klass_reference_at(super_class_index),
3147 "Invalid superclass index %u in class file %s",
3148 super_class_index,
3149 CHECK_NULL);
3150 // The class name should be legal because it is checked when parsing constant pool.
3151 // However, make sure it is not an array type.
3152 bool is_array = false;
3153 if (_cp->tag_at(super_class_index).is_klass()) {
3154 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3155 if (_need_verify)
3156 is_array = super_klass->oop_is_array();
3157 } else if (_need_verify) {
3158 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3159 }
3160 if (_need_verify) {
3161 guarantee_property(!is_array,
3162 "Bad superclass name in class file %s", CHECK_NULL);
3163 }
3164 }
3165 return super_klass;
3166 }
3169 // Values needed for oopmap and InstanceKlass creation
3170 class FieldLayoutInfo : public StackObj {
3171 public:
3172 int* nonstatic_oop_offsets;
3173 unsigned int* nonstatic_oop_counts;
3174 unsigned int nonstatic_oop_map_count;
3175 unsigned int total_oop_map_count;
3176 int instance_size;
3177 int nonstatic_field_size;
3178 int static_field_size;
3179 bool has_nonstatic_fields;
3180 };
3182 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3183 void ClassFileParser::layout_fields(Handle class_loader,
3184 FieldAllocationCount* fac,
3185 ClassAnnotationCollector* parsed_annotations,
3186 FieldLayoutInfo* info,
3187 TRAPS) {
3189 // Field size and offset computation
3190 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3191 int next_static_oop_offset;
3192 int next_static_double_offset;
3193 int next_static_word_offset;
3194 int next_static_short_offset;
3195 int next_static_byte_offset;
3196 int next_nonstatic_oop_offset;
3197 int next_nonstatic_double_offset;
3198 int next_nonstatic_word_offset;
3199 int next_nonstatic_short_offset;
3200 int next_nonstatic_byte_offset;
3201 int first_nonstatic_oop_offset;
3202 int next_nonstatic_field_offset;
3203 int next_nonstatic_padded_offset;
3205 // Count the contended fields by type.
3206 //
3207 // We ignore static fields, because @Contended is not supported for them.
3208 // The layout code below will also ignore the static fields.
3209 int nonstatic_contended_count = 0;
3210 FieldAllocationCount fac_contended;
3211 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3212 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3213 if (fs.is_contended()) {
3214 fac_contended.count[atype]++;
3215 if (!fs.access_flags().is_static()) {
3216 nonstatic_contended_count++;
3217 }
3218 }
3219 }
3222 // Calculate the starting byte offsets
3223 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3224 next_static_double_offset = next_static_oop_offset +
3225 ((fac->count[STATIC_OOP]) * heapOopSize);
3226 if ( fac->count[STATIC_DOUBLE] &&
3227 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3228 Universe::field_type_should_be_aligned(T_LONG)) ) {
3229 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3230 }
3232 next_static_word_offset = next_static_double_offset +
3233 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3234 next_static_short_offset = next_static_word_offset +
3235 ((fac->count[STATIC_WORD]) * BytesPerInt);
3236 next_static_byte_offset = next_static_short_offset +
3237 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3239 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3240 nonstatic_field_size * heapOopSize;
3242 next_nonstatic_field_offset = nonstatic_fields_start;
3244 bool is_contended_class = parsed_annotations->is_contended();
3246 // Class is contended, pad before all the fields
3247 if (is_contended_class) {
3248 next_nonstatic_field_offset += ContendedPaddingWidth;
3249 }
3251 // Compute the non-contended fields count.
3252 // The packing code below relies on these counts to determine if some field
3253 // can be squeezed into the alignment gap. Contended fields are obviously
3254 // exempt from that.
3255 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3256 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3257 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3258 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3259 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3261 // Total non-static fields count, including every contended field
3262 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3263 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3264 fac->count[NONSTATIC_OOP];
3266 bool super_has_nonstatic_fields =
3267 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3268 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3271 // Prepare list of oops for oop map generation.
3272 //
3273 // "offset" and "count" lists are describing the set of contiguous oop
3274 // regions. offset[i] is the start of the i-th region, which then has
3275 // count[i] oops following. Before we know how many regions are required,
3276 // we pessimistically allocate the maps to fit all the oops into the
3277 // distinct regions.
3278 //
3279 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3280 // to figure out if we still need to do this.
3281 int* nonstatic_oop_offsets;
3282 unsigned int* nonstatic_oop_counts;
3283 unsigned int nonstatic_oop_map_count = 0;
3284 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3286 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3287 THREAD, int, max_nonstatic_oop_maps);
3288 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3289 THREAD, unsigned int, max_nonstatic_oop_maps);
3291 first_nonstatic_oop_offset = 0; // will be set for first oop field
3293 bool compact_fields = CompactFields;
3294 int allocation_style = FieldsAllocationStyle;
3295 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3296 assert(false, "0 <= FieldsAllocationStyle <= 2");
3297 allocation_style = 1; // Optimistic
3298 }
3300 // The next classes have predefined hard-coded fields offsets
3301 // (see in JavaClasses::compute_hard_coded_offsets()).
3302 // Use default fields allocation order for them.
3303 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3304 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3305 _class_name == vmSymbols::java_lang_Class() ||
3306 _class_name == vmSymbols::java_lang_ClassLoader() ||
3307 _class_name == vmSymbols::java_lang_ref_Reference() ||
3308 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3309 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3310 _class_name == vmSymbols::java_lang_String() ||
3311 _class_name == vmSymbols::java_lang_Throwable() ||
3312 _class_name == vmSymbols::java_lang_Boolean() ||
3313 _class_name == vmSymbols::java_lang_Character() ||
3314 _class_name == vmSymbols::java_lang_Float() ||
3315 _class_name == vmSymbols::java_lang_Double() ||
3316 _class_name == vmSymbols::java_lang_Byte() ||
3317 _class_name == vmSymbols::java_lang_Short() ||
3318 _class_name == vmSymbols::java_lang_Integer() ||
3319 _class_name == vmSymbols::java_lang_Long())) {
3320 allocation_style = 0; // Allocate oops first
3321 compact_fields = false; // Don't compact fields
3322 }
3324 // Rearrange fields for a given allocation style
3325 if( allocation_style == 0 ) {
3326 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3327 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3328 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3329 (nonstatic_oop_count * heapOopSize);
3330 } else if( allocation_style == 1 ) {
3331 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3332 next_nonstatic_double_offset = next_nonstatic_field_offset;
3333 } else if( allocation_style == 2 ) {
3334 // Fields allocation: oops fields in super and sub classes are together.
3335 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3336 _super_klass->nonstatic_oop_map_size() > 0 ) {
3337 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3338 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3339 OopMapBlock* last_map = first_map + map_count - 1;
3340 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3341 if (next_offset == next_nonstatic_field_offset) {
3342 allocation_style = 0; // allocate oops first
3343 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3344 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3345 (nonstatic_oop_count * heapOopSize);
3346 }
3347 }
3348 if( allocation_style == 2 ) {
3349 allocation_style = 1; // allocate oops last
3350 next_nonstatic_double_offset = next_nonstatic_field_offset;
3351 }
3352 } else {
3353 ShouldNotReachHere();
3354 }
3356 int nonstatic_oop_space_count = 0;
3357 int nonstatic_word_space_count = 0;
3358 int nonstatic_short_space_count = 0;
3359 int nonstatic_byte_space_count = 0;
3360 int nonstatic_oop_space_offset;
3361 int nonstatic_word_space_offset;
3362 int nonstatic_short_space_offset;
3363 int nonstatic_byte_space_offset;
3365 // Try to squeeze some of the fields into the gaps due to
3366 // long/double alignment.
3367 if( nonstatic_double_count > 0 ) {
3368 int offset = next_nonstatic_double_offset;
3369 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3370 if( compact_fields && offset != next_nonstatic_double_offset ) {
3371 // Allocate available fields into the gap before double field.
3372 int length = next_nonstatic_double_offset - offset;
3373 assert(length == BytesPerInt, "");
3374 nonstatic_word_space_offset = offset;
3375 if( nonstatic_word_count > 0 ) {
3376 nonstatic_word_count -= 1;
3377 nonstatic_word_space_count = 1; // Only one will fit
3378 length -= BytesPerInt;
3379 offset += BytesPerInt;
3380 }
3381 nonstatic_short_space_offset = offset;
3382 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3383 nonstatic_short_count -= 1;
3384 nonstatic_short_space_count += 1;
3385 length -= BytesPerShort;
3386 offset += BytesPerShort;
3387 }
3388 nonstatic_byte_space_offset = offset;
3389 while( length > 0 && nonstatic_byte_count > 0 ) {
3390 nonstatic_byte_count -= 1;
3391 nonstatic_byte_space_count += 1;
3392 length -= 1;
3393 }
3394 // Allocate oop field in the gap if there are no other fields for that.
3395 nonstatic_oop_space_offset = offset;
3396 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3397 allocation_style != 0 ) { // when oop fields not first
3398 nonstatic_oop_count -= 1;
3399 nonstatic_oop_space_count = 1; // Only one will fit
3400 length -= heapOopSize;
3401 offset += heapOopSize;
3402 }
3403 }
3404 }
3406 next_nonstatic_word_offset = next_nonstatic_double_offset +
3407 (nonstatic_double_count * BytesPerLong);
3408 next_nonstatic_short_offset = next_nonstatic_word_offset +
3409 (nonstatic_word_count * BytesPerInt);
3410 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3411 (nonstatic_short_count * BytesPerShort);
3412 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3413 nonstatic_byte_count;
3415 // let oops jump before padding with this allocation style
3416 if( allocation_style == 1 ) {
3417 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3418 if( nonstatic_oop_count > 0 ) {
3419 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3420 }
3421 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3422 }
3424 // Iterate over fields again and compute correct offsets.
3425 // The field allocation type was temporarily stored in the offset slot.
3426 // oop fields are located before non-oop fields (static and non-static).
3427 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3429 // skip already laid out fields
3430 if (fs.is_offset_set()) continue;
3432 // contended instance fields are handled below
3433 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3435 int real_offset;
3436 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3438 // pack the rest of the fields
3439 switch (atype) {
3440 case STATIC_OOP:
3441 real_offset = next_static_oop_offset;
3442 next_static_oop_offset += heapOopSize;
3443 break;
3444 case STATIC_BYTE:
3445 real_offset = next_static_byte_offset;
3446 next_static_byte_offset += 1;
3447 break;
3448 case STATIC_SHORT:
3449 real_offset = next_static_short_offset;
3450 next_static_short_offset += BytesPerShort;
3451 break;
3452 case STATIC_WORD:
3453 real_offset = next_static_word_offset;
3454 next_static_word_offset += BytesPerInt;
3455 break;
3456 case STATIC_DOUBLE:
3457 real_offset = next_static_double_offset;
3458 next_static_double_offset += BytesPerLong;
3459 break;
3460 case NONSTATIC_OOP:
3461 if( nonstatic_oop_space_count > 0 ) {
3462 real_offset = nonstatic_oop_space_offset;
3463 nonstatic_oop_space_offset += heapOopSize;
3464 nonstatic_oop_space_count -= 1;
3465 } else {
3466 real_offset = next_nonstatic_oop_offset;
3467 next_nonstatic_oop_offset += heapOopSize;
3468 }
3469 // Update oop maps
3470 if( nonstatic_oop_map_count > 0 &&
3471 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3472 real_offset -
3473 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3474 heapOopSize ) {
3475 // Extend current oop map
3476 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3477 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3478 } else {
3479 // Create new oop map
3480 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3481 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3482 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3483 nonstatic_oop_map_count += 1;
3484 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3485 first_nonstatic_oop_offset = real_offset;
3486 }
3487 }
3488 break;
3489 case NONSTATIC_BYTE:
3490 if( nonstatic_byte_space_count > 0 ) {
3491 real_offset = nonstatic_byte_space_offset;
3492 nonstatic_byte_space_offset += 1;
3493 nonstatic_byte_space_count -= 1;
3494 } else {
3495 real_offset = next_nonstatic_byte_offset;
3496 next_nonstatic_byte_offset += 1;
3497 }
3498 break;
3499 case NONSTATIC_SHORT:
3500 if( nonstatic_short_space_count > 0 ) {
3501 real_offset = nonstatic_short_space_offset;
3502 nonstatic_short_space_offset += BytesPerShort;
3503 nonstatic_short_space_count -= 1;
3504 } else {
3505 real_offset = next_nonstatic_short_offset;
3506 next_nonstatic_short_offset += BytesPerShort;
3507 }
3508 break;
3509 case NONSTATIC_WORD:
3510 if( nonstatic_word_space_count > 0 ) {
3511 real_offset = nonstatic_word_space_offset;
3512 nonstatic_word_space_offset += BytesPerInt;
3513 nonstatic_word_space_count -= 1;
3514 } else {
3515 real_offset = next_nonstatic_word_offset;
3516 next_nonstatic_word_offset += BytesPerInt;
3517 }
3518 break;
3519 case NONSTATIC_DOUBLE:
3520 real_offset = next_nonstatic_double_offset;
3521 next_nonstatic_double_offset += BytesPerLong;
3522 break;
3523 default:
3524 ShouldNotReachHere();
3525 }
3526 fs.set_offset(real_offset);
3527 }
3530 // Handle the contended cases.
3531 //
3532 // Each contended field should not intersect the cache line with another contended field.
3533 // In the absence of alignment information, we end up with pessimistically separating
3534 // the fields with full-width padding.
3535 //
3536 // Additionally, this should not break alignment for the fields, so we round the alignment up
3537 // for each field.
3538 if (nonstatic_contended_count > 0) {
3540 // if there is at least one contended field, we need to have pre-padding for them
3541 next_nonstatic_padded_offset += ContendedPaddingWidth;
3543 // collect all contended groups
3544 BitMap bm(_cp->size());
3545 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3546 // skip already laid out fields
3547 if (fs.is_offset_set()) continue;
3549 if (fs.is_contended()) {
3550 bm.set_bit(fs.contended_group());
3551 }
3552 }
3554 int current_group = -1;
3555 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3557 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3559 // skip already laid out fields
3560 if (fs.is_offset_set()) continue;
3562 // skip non-contended fields and fields from different group
3563 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3565 // handle statics below
3566 if (fs.access_flags().is_static()) continue;
3568 int real_offset;
3569 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3571 switch (atype) {
3572 case NONSTATIC_BYTE:
3573 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3574 real_offset = next_nonstatic_padded_offset;
3575 next_nonstatic_padded_offset += 1;
3576 break;
3578 case NONSTATIC_SHORT:
3579 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3580 real_offset = next_nonstatic_padded_offset;
3581 next_nonstatic_padded_offset += BytesPerShort;
3582 break;
3584 case NONSTATIC_WORD:
3585 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3586 real_offset = next_nonstatic_padded_offset;
3587 next_nonstatic_padded_offset += BytesPerInt;
3588 break;
3590 case NONSTATIC_DOUBLE:
3591 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3592 real_offset = next_nonstatic_padded_offset;
3593 next_nonstatic_padded_offset += BytesPerLong;
3594 break;
3596 case NONSTATIC_OOP:
3597 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3598 real_offset = next_nonstatic_padded_offset;
3599 next_nonstatic_padded_offset += heapOopSize;
3601 // Create new oop map
3602 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3603 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3604 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3605 nonstatic_oop_map_count += 1;
3606 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3607 first_nonstatic_oop_offset = real_offset;
3608 }
3609 break;
3611 default:
3612 ShouldNotReachHere();
3613 }
3615 if (fs.contended_group() == 0) {
3616 // Contended group defines the equivalence class over the fields:
3617 // the fields within the same contended group are not inter-padded.
3618 // The only exception is default group, which does not incur the
3619 // equivalence, and so requires intra-padding.
3620 next_nonstatic_padded_offset += ContendedPaddingWidth;
3621 }
3623 fs.set_offset(real_offset);
3624 } // for
3626 // Start laying out the next group.
3627 // Note that this will effectively pad the last group in the back;
3628 // this is expected to alleviate memory contention effects for
3629 // subclass fields and/or adjacent object.
3630 // If this was the default group, the padding is already in place.
3631 if (current_group != 0) {
3632 next_nonstatic_padded_offset += ContendedPaddingWidth;
3633 }
3634 }
3636 // handle static fields
3637 }
3639 // Entire class is contended, pad in the back.
3640 // This helps to alleviate memory contention effects for subclass fields
3641 // and/or adjacent object.
3642 if (is_contended_class) {
3643 next_nonstatic_padded_offset += ContendedPaddingWidth;
3644 }
3646 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3648 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3649 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3650 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3652 int static_field_size = (static_fields_end -
3653 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3654 nonstatic_field_size = nonstatic_field_size +
3655 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3657 int instance_size = align_object_size(instance_end / wordSize);
3659 assert(instance_size == align_object_size(align_size_up(
3660 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3661 wordSize) / wordSize), "consistent layout helper value");
3663 // Invariant: nonstatic_field end/start should only change if there are
3664 // nonstatic fields in the class, or if the class is contended. We compare
3665 // against the non-aligned value, so that end alignment will not fail the
3666 // assert without actually having the fields.
3667 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3668 is_contended_class ||
3669 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3671 // Number of non-static oop map blocks allocated at end of klass.
3672 const unsigned int total_oop_map_count =
3673 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3674 first_nonstatic_oop_offset);
3676 #ifndef PRODUCT
3677 if (PrintFieldLayout) {
3678 print_field_layout(_class_name,
3679 _fields,
3680 _cp,
3681 instance_size,
3682 nonstatic_fields_start,
3683 nonstatic_fields_end,
3684 static_fields_end);
3685 }
3687 #endif
3688 // Pass back information needed for InstanceKlass creation
3689 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3690 info->nonstatic_oop_counts = nonstatic_oop_counts;
3691 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3692 info->total_oop_map_count = total_oop_map_count;
3693 info->instance_size = instance_size;
3694 info->static_field_size = static_field_size;
3695 info->nonstatic_field_size = nonstatic_field_size;
3696 info->has_nonstatic_fields = has_nonstatic_fields;
3697 }
3700 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3701 ClassLoaderData* loader_data,
3702 Handle protection_domain,
3703 KlassHandle host_klass,
3704 GrowableArray<Handle>* cp_patches,
3705 TempNewSymbol& parsed_name,
3706 bool verify,
3707 TRAPS) {
3709 // When a retransformable agent is attached, JVMTI caches the
3710 // class bytes that existed before the first retransformation.
3711 // If RedefineClasses() was used before the retransformable
3712 // agent attached, then the cached class bytes may not be the
3713 // original class bytes.
3714 JvmtiCachedClassFileData *cached_class_file = NULL;
3715 Handle class_loader(THREAD, loader_data->class_loader());
3716 bool has_default_methods = false;
3717 bool declares_default_methods = false;
3718 ResourceMark rm(THREAD);
3720 ClassFileStream* cfs = stream();
3721 // Timing
3722 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3723 JavaThread* jt = (JavaThread*) THREAD;
3725 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3726 ClassLoader::perf_class_parse_selftime(),
3727 NULL,
3728 jt->get_thread_stat()->perf_recursion_counts_addr(),
3729 jt->get_thread_stat()->perf_timers_addr(),
3730 PerfClassTraceTime::PARSE_CLASS);
3732 init_parsed_class_attributes(loader_data);
3734 if (JvmtiExport::should_post_class_file_load_hook()) {
3735 // Get the cached class file bytes (if any) from the class that
3736 // is being redefined or retransformed. We use jvmti_thread_state()
3737 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3738 // a JvmtiThreadState any earlier than necessary. This will help
3739 // avoid the bug described by 7126851.
3740 JvmtiThreadState *state = jt->jvmti_thread_state();
3741 if (state != NULL) {
3742 KlassHandle *h_class_being_redefined =
3743 state->get_class_being_redefined();
3744 if (h_class_being_redefined != NULL) {
3745 instanceKlassHandle ikh_class_being_redefined =
3746 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3747 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3748 }
3749 }
3751 unsigned char* ptr = cfs->buffer();
3752 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3754 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3755 &ptr, &end_ptr, &cached_class_file);
3757 if (ptr != cfs->buffer()) {
3758 // JVMTI agent has modified class file data.
3759 // Set new class file stream using JVMTI agent modified
3760 // class file data.
3761 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3762 set_stream(cfs);
3763 }
3764 }
3766 _host_klass = host_klass;
3767 _cp_patches = cp_patches;
3769 instanceKlassHandle nullHandle;
3771 // Figure out whether we can skip format checking (matching classic VM behavior)
3772 if (DumpSharedSpaces) {
3773 // verify == true means it's a 'remote' class (i.e., non-boot class)
3774 // Verification decision is based on BytecodeVerificationRemote flag
3775 // for those classes.
3776 _need_verify = (verify) ? BytecodeVerificationRemote :
3777 BytecodeVerificationLocal;
3778 } else {
3779 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3780 }
3782 // Set the verify flag in stream
3783 cfs->set_verify(_need_verify);
3785 // Save the class file name for easier error message printing.
3786 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3788 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3789 // Magic value
3790 u4 magic = cfs->get_u4_fast();
3791 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3792 "Incompatible magic value %u in class file %s",
3793 magic, CHECK_(nullHandle));
3795 // Version numbers
3796 u2 minor_version = cfs->get_u2_fast();
3797 u2 major_version = cfs->get_u2_fast();
3799 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3800 ResourceMark rm;
3801 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3802 major_version, minor_version, name->as_C_string());
3803 Exceptions::fthrow(
3804 THREAD_AND_LOCATION,
3805 vmSymbols::java_lang_UnsupportedClassVersionError(),
3806 "Unsupported major.minor version for dump time %u.%u",
3807 major_version,
3808 minor_version);
3809 }
3811 // Check version numbers - we check this even with verifier off
3812 if (!is_supported_version(major_version, minor_version)) {
3813 if (name == NULL) {
3814 Exceptions::fthrow(
3815 THREAD_AND_LOCATION,
3816 vmSymbols::java_lang_UnsupportedClassVersionError(),
3817 "Unsupported class file version %u.%u, "
3818 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3819 major_version,
3820 minor_version,
3821 JAVA_MAX_SUPPORTED_VERSION,
3822 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3823 } else {
3824 ResourceMark rm(THREAD);
3825 Exceptions::fthrow(
3826 THREAD_AND_LOCATION,
3827 vmSymbols::java_lang_UnsupportedClassVersionError(),
3828 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3829 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3830 name->as_C_string(),
3831 major_version,
3832 minor_version,
3833 JAVA_MAX_SUPPORTED_VERSION,
3834 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3835 }
3836 return nullHandle;
3837 }
3839 _major_version = major_version;
3840 _minor_version = minor_version;
3843 // Check if verification needs to be relaxed for this class file
3844 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3845 _relax_verify = Verifier::relax_verify_for(class_loader());
3847 // Constant pool
3848 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3850 int cp_size = cp->length();
3852 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3854 // Access flags
3855 AccessFlags access_flags;
3856 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3858 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3859 // Set abstract bit for old class files for backward compatibility
3860 flags |= JVM_ACC_ABSTRACT;
3861 }
3862 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3863 access_flags.set_flags(flags);
3865 // This class and superclass
3866 u2 this_class_index = cfs->get_u2_fast();
3867 check_property(
3868 valid_cp_range(this_class_index, cp_size) &&
3869 cp->tag_at(this_class_index).is_unresolved_klass(),
3870 "Invalid this class index %u in constant pool in class file %s",
3871 this_class_index, CHECK_(nullHandle));
3873 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3874 assert(class_name != NULL, "class_name can't be null");
3876 // It's important to set parsed_name *before* resolving the super class.
3877 // (it's used for cleanup by the caller if parsing fails)
3878 parsed_name = class_name;
3879 // parsed_name is returned and can be used if there's an error, so add to
3880 // its reference count. Caller will decrement the refcount.
3881 parsed_name->increment_refcount();
3883 // Update _class_name which could be null previously to be class_name
3884 _class_name = class_name;
3886 // Don't need to check whether this class name is legal or not.
3887 // It has been checked when constant pool is parsed.
3888 // However, make sure it is not an array type.
3889 if (_need_verify) {
3890 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3891 "Bad class name in class file %s",
3892 CHECK_(nullHandle));
3893 }
3895 Klass* preserve_this_klass; // for storing result across HandleMark
3897 // release all handles when parsing is done
3898 { HandleMark hm(THREAD);
3900 // Checks if name in class file matches requested name
3901 if (name != NULL && class_name != name) {
3902 ResourceMark rm(THREAD);
3903 Exceptions::fthrow(
3904 THREAD_AND_LOCATION,
3905 vmSymbols::java_lang_NoClassDefFoundError(),
3906 "%s (wrong name: %s)",
3907 name->as_C_string(),
3908 class_name->as_C_string()
3909 );
3910 return nullHandle;
3911 }
3913 if (TraceClassLoadingPreorder) {
3914 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3915 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3916 tty->print_cr("]");
3917 }
3918 #if INCLUDE_CDS
3919 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3920 // Only dump the classes that can be stored into CDS archive
3921 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3922 if (name != NULL) {
3923 ResourceMark rm(THREAD);
3924 classlist_file->print_cr("%s", name->as_C_string());
3925 classlist_file->flush();
3926 }
3927 }
3928 }
3929 #endif
3931 u2 super_class_index = cfs->get_u2_fast();
3932 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3933 CHECK_NULL);
3935 // Interfaces
3936 u2 itfs_len = cfs->get_u2_fast();
3937 Array<Klass*>* local_interfaces =
3938 parse_interfaces(itfs_len, protection_domain, _class_name,
3939 &has_default_methods, CHECK_(nullHandle));
3941 u2 java_fields_count = 0;
3942 // Fields (offsets are filled in later)
3943 FieldAllocationCount fac;
3944 Array<u2>* fields = parse_fields(class_name,
3945 access_flags.is_interface(),
3946 &fac, &java_fields_count,
3947 CHECK_(nullHandle));
3948 // Methods
3949 bool has_final_method = false;
3950 AccessFlags promoted_flags;
3951 promoted_flags.set_flags(0);
3952 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3953 &promoted_flags,
3954 &has_final_method,
3955 &declares_default_methods,
3956 CHECK_(nullHandle));
3957 if (declares_default_methods) {
3958 has_default_methods = true;
3959 }
3961 // Additional attributes
3962 ClassAnnotationCollector parsed_annotations;
3963 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3965 // Finalize the Annotations metadata object,
3966 // now that all annotation arrays have been created.
3967 create_combined_annotations(CHECK_(nullHandle));
3969 // Make sure this is the end of class file stream
3970 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3972 // We check super class after class file is parsed and format is checked
3973 if (super_class_index > 0 && super_klass.is_null()) {
3974 Symbol* sk = cp->klass_name_at(super_class_index);
3975 if (access_flags.is_interface()) {
3976 // Before attempting to resolve the superclass, check for class format
3977 // errors not checked yet.
3978 guarantee_property(sk == vmSymbols::java_lang_Object(),
3979 "Interfaces must have java.lang.Object as superclass in class file %s",
3980 CHECK_(nullHandle));
3981 }
3982 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3983 class_loader,
3984 protection_domain,
3985 true,
3986 CHECK_(nullHandle));
3988 KlassHandle kh (THREAD, k);
3989 super_klass = instanceKlassHandle(THREAD, kh());
3990 }
3991 if (super_klass.not_null()) {
3993 if (super_klass->has_default_methods()) {
3994 has_default_methods = true;
3995 }
3997 if (super_klass->is_interface()) {
3998 ResourceMark rm(THREAD);
3999 Exceptions::fthrow(
4000 THREAD_AND_LOCATION,
4001 vmSymbols::java_lang_IncompatibleClassChangeError(),
4002 "class %s has interface %s as super class",
4003 class_name->as_klass_external_name(),
4004 super_klass->external_name()
4005 );
4006 return nullHandle;
4007 }
4008 // Make sure super class is not final
4009 if (super_klass->is_final()) {
4010 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4011 }
4012 }
4014 // save super klass for error handling.
4015 _super_klass = super_klass;
4017 // Compute the transitive list of all unique interfaces implemented by this class
4018 _transitive_interfaces =
4019 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4021 // sort methods
4022 intArray* method_ordering = sort_methods(methods);
4024 // promote flags from parse_methods() to the klass' flags
4025 access_flags.add_promoted_flags(promoted_flags.as_int());
4027 // Size of Java vtable (in words)
4028 int vtable_size = 0;
4029 int itable_size = 0;
4030 int num_miranda_methods = 0;
4032 GrowableArray<Method*> all_mirandas(20);
4034 klassVtable::compute_vtable_size_and_num_mirandas(
4035 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4036 access_flags, class_loader, class_name, local_interfaces,
4037 CHECK_(nullHandle));
4039 // Size of Java itable (in words)
4040 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4042 FieldLayoutInfo info;
4043 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4045 int total_oop_map_size2 =
4046 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4048 // Compute reference type
4049 ReferenceType rt;
4050 if (super_klass() == NULL) {
4051 rt = REF_NONE;
4052 } else {
4053 rt = super_klass->reference_type();
4054 }
4056 // We can now create the basic Klass* for this klass
4057 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4058 vtable_size,
4059 itable_size,
4060 info.static_field_size,
4061 total_oop_map_size2,
4062 rt,
4063 access_flags,
4064 name,
4065 super_klass(),
4066 !host_klass.is_null(),
4067 CHECK_(nullHandle));
4068 instanceKlassHandle this_klass (THREAD, _klass);
4070 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4071 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4072 "sanity");
4074 // Fill in information already parsed
4075 this_klass->set_should_verify_class(verify);
4076 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4077 this_klass->set_layout_helper(lh);
4078 assert(this_klass->oop_is_instance(), "layout is correct");
4079 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4080 // Not yet: supers are done below to support the new subtype-checking fields
4081 //this_klass->set_super(super_klass());
4082 this_klass->set_class_loader_data(loader_data);
4083 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4084 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4085 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4087 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4089 if (has_final_method) {
4090 this_klass->set_has_final_method();
4091 }
4092 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4093 // The InstanceKlass::_methods_jmethod_ids cache
4094 // is managed on the assumption that the initial cache
4095 // size is equal to the number of methods in the class. If
4096 // that changes, then InstanceKlass::idnum_can_increment()
4097 // has to be changed accordingly.
4098 this_klass->set_initial_method_idnum(methods->length());
4099 this_klass->set_name(cp->klass_name_at(this_class_index));
4100 if (is_anonymous()) // I am well known to myself
4101 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4103 this_klass->set_minor_version(minor_version);
4104 this_klass->set_major_version(major_version);
4105 this_klass->set_has_default_methods(has_default_methods);
4106 this_klass->set_declares_default_methods(declares_default_methods);
4108 if (!host_klass.is_null()) {
4109 assert (this_klass->is_anonymous(), "should be the same");
4110 this_klass->set_host_klass(host_klass());
4111 }
4113 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4114 // (We used to do this lazily, but now we query it in Rewriter,
4115 // which is eagerly done for every method, so we might as well do it now,
4116 // when everything is fresh in memory.)
4117 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4118 for (int j = 0; j < methods->length(); j++) {
4119 methods->at(j)->init_intrinsic_id();
4120 }
4121 }
4123 if (cached_class_file != NULL) {
4124 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4125 this_klass->set_cached_class_file(cached_class_file);
4126 }
4128 // Fill in field values obtained by parse_classfile_attributes
4129 if (parsed_annotations.has_any_annotations())
4130 parsed_annotations.apply_to(this_klass);
4131 apply_parsed_class_attributes(this_klass);
4133 // Miranda methods
4134 if ((num_miranda_methods > 0) ||
4135 // if this class introduced new miranda methods or
4136 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4137 // super class exists and this class inherited miranda methods
4138 ) {
4139 this_klass->set_has_miranda_methods(); // then set a flag
4140 }
4142 // Fill in information needed to compute superclasses.
4143 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4145 // Initialize itable offset tables
4146 klassItable::setup_itable_offset_table(this_klass);
4148 // Compute transitive closure of interfaces this class implements
4149 // Do final class setup
4150 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4152 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4153 set_precomputed_flags(this_klass);
4155 // reinitialize modifiers, using the InnerClasses attribute
4156 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4157 this_klass->set_modifier_flags(computed_modifiers);
4159 // check if this class can access its super class
4160 check_super_class_access(this_klass, CHECK_(nullHandle));
4162 // check if this class can access its superinterfaces
4163 check_super_interface_access(this_klass, CHECK_(nullHandle));
4165 // check if this class overrides any final method
4166 check_final_method_override(this_klass, CHECK_(nullHandle));
4168 // check that if this class is an interface then it doesn't have static methods
4169 if (this_klass->is_interface()) {
4170 /* An interface in a JAVA 8 classfile can be static */
4171 if (_major_version < JAVA_8_VERSION) {
4172 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4173 }
4174 }
4176 // Allocate mirror and initialize static fields
4177 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4178 CHECK_(nullHandle));
4180 // Generate any default methods - default methods are interface methods
4181 // that have a default implementation. This is new with Lambda project.
4182 if (has_default_methods ) {
4183 DefaultMethods::generate_default_methods(
4184 this_klass(), &all_mirandas, CHECK_(nullHandle));
4185 }
4187 // Update the loader_data graph.
4188 record_defined_class_dependencies(this_klass, CHECK_NULL);
4190 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4191 false /* not shared class */);
4193 if (TraceClassLoading) {
4194 ResourceMark rm;
4195 // print in a single call to reduce interleaving of output
4196 if (cfs->source() != NULL) {
4197 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4198 cfs->source());
4199 } else if (class_loader.is_null()) {
4200 Klass* caller =
4201 THREAD->is_Java_thread()
4202 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4203 : NULL;
4204 // caller can be NULL, for example, during a JVMTI VM_Init hook
4205 if (caller != NULL) {
4206 tty->print("[Loaded %s by instance of %s]\n",
4207 this_klass->external_name(),
4208 InstanceKlass::cast(caller)->external_name());
4209 } else {
4210 tty->print("[Loaded %s]\n", this_klass->external_name());
4211 }
4212 } else {
4213 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4214 InstanceKlass::cast(class_loader->klass())->external_name());
4215 }
4216 }
4218 if (TraceClassResolution) {
4219 ResourceMark rm;
4220 // print out the superclass.
4221 const char * from = this_klass()->external_name();
4222 if (this_klass->java_super() != NULL) {
4223 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4224 }
4225 // print out each of the interface classes referred to by this class.
4226 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4227 if (local_interfaces != NULL) {
4228 int length = local_interfaces->length();
4229 for (int i = 0; i < length; i++) {
4230 Klass* k = local_interfaces->at(i);
4231 InstanceKlass* to_class = InstanceKlass::cast(k);
4232 const char * to = to_class->external_name();
4233 tty->print("RESOLVE %s %s (interface)\n", from, to);
4234 }
4235 }
4236 }
4238 // preserve result across HandleMark
4239 preserve_this_klass = this_klass();
4240 }
4242 // Create new handle outside HandleMark (might be needed for
4243 // Extended Class Redefinition)
4244 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4245 debug_only(this_klass->verify();)
4247 // Clear class if no error has occurred so destructor doesn't deallocate it
4248 _klass = NULL;
4249 return this_klass;
4250 }
4252 // Destructor to clean up if there's an error
4253 ClassFileParser::~ClassFileParser() {
4254 MetadataFactory::free_metadata(_loader_data, _cp);
4255 MetadataFactory::free_array<u2>(_loader_data, _fields);
4257 // Free methods
4258 InstanceKlass::deallocate_methods(_loader_data, _methods);
4260 // beware of the Universe::empty_blah_array!!
4261 if (_inner_classes != Universe::the_empty_short_array()) {
4262 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4263 }
4265 // Free interfaces
4266 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4267 _local_interfaces, _transitive_interfaces);
4269 if (_combined_annotations != NULL) {
4270 // After all annotations arrays have been created, they are installed into the
4271 // Annotations object that will be assigned to the InstanceKlass being created.
4273 // Deallocate the Annotations object and the installed annotations arrays.
4274 _combined_annotations->deallocate_contents(_loader_data);
4276 // If the _combined_annotations pointer is non-NULL,
4277 // then the other annotations fields should have been cleared.
4278 assert(_annotations == NULL, "Should have been cleared");
4279 assert(_type_annotations == NULL, "Should have been cleared");
4280 assert(_fields_annotations == NULL, "Should have been cleared");
4281 assert(_fields_type_annotations == NULL, "Should have been cleared");
4282 } else {
4283 // If the annotations arrays were not installed into the Annotations object,
4284 // then they have to be deallocated explicitly.
4285 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4286 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4287 Annotations::free_contents(_loader_data, _fields_annotations);
4288 Annotations::free_contents(_loader_data, _fields_type_annotations);
4289 }
4291 clear_class_metadata();
4293 // deallocate the klass if already created. Don't directly deallocate, but add
4294 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4295 // at a safepoint.
4296 if (_klass != NULL) {
4297 _loader_data->add_to_deallocate_list(_klass);
4298 }
4299 _klass = NULL;
4300 }
4302 void ClassFileParser::print_field_layout(Symbol* name,
4303 Array<u2>* fields,
4304 constantPoolHandle cp,
4305 int instance_size,
4306 int instance_fields_start,
4307 int instance_fields_end,
4308 int static_fields_end) {
4309 tty->print("%s: field layout\n", name->as_klass_external_name());
4310 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4311 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4312 if (!fs.access_flags().is_static()) {
4313 tty->print(" @%3d \"%s\" %s\n",
4314 fs.offset(),
4315 fs.name()->as_klass_external_name(),
4316 fs.signature()->as_klass_external_name());
4317 }
4318 }
4319 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4320 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4321 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4322 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4323 if (fs.access_flags().is_static()) {
4324 tty->print(" @%3d \"%s\" %s\n",
4325 fs.offset(),
4326 fs.name()->as_klass_external_name(),
4327 fs.signature()->as_klass_external_name());
4328 }
4329 }
4330 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4331 tty->print("\n");
4332 }
4334 unsigned int
4335 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4336 unsigned int nonstatic_oop_map_count,
4337 int first_nonstatic_oop_offset) {
4338 unsigned int map_count =
4339 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4340 if (nonstatic_oop_map_count > 0) {
4341 // We have oops to add to map
4342 if (map_count == 0) {
4343 map_count = nonstatic_oop_map_count;
4344 } else {
4345 // Check whether we should add a new map block or whether the last one can
4346 // be extended
4347 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4348 OopMapBlock* const last_map = first_map + map_count - 1;
4350 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4351 if (next_offset == first_nonstatic_oop_offset) {
4352 // There is no gap bettwen superklass's last oop field and first
4353 // local oop field, merge maps.
4354 nonstatic_oop_map_count -= 1;
4355 } else {
4356 // Superklass didn't end with a oop field, add extra maps
4357 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4358 }
4359 map_count += nonstatic_oop_map_count;
4360 }
4361 }
4362 return map_count;
4363 }
4366 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4367 unsigned int nonstatic_oop_map_count,
4368 int* nonstatic_oop_offsets,
4369 unsigned int* nonstatic_oop_counts) {
4370 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4371 const InstanceKlass* const super = k->superklass();
4372 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4373 if (super_count > 0) {
4374 // Copy maps from superklass
4375 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4376 for (unsigned int i = 0; i < super_count; ++i) {
4377 *this_oop_map++ = *super_oop_map++;
4378 }
4379 }
4381 if (nonstatic_oop_map_count > 0) {
4382 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4383 // The counts differ because there is no gap between superklass's last oop
4384 // field and the first local oop field. Extend the last oop map copied
4385 // from the superklass instead of creating new one.
4386 nonstatic_oop_map_count--;
4387 nonstatic_oop_offsets++;
4388 this_oop_map--;
4389 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4390 this_oop_map++;
4391 }
4393 // Add new map blocks, fill them
4394 while (nonstatic_oop_map_count-- > 0) {
4395 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4396 this_oop_map->set_count(*nonstatic_oop_counts++);
4397 this_oop_map++;
4398 }
4399 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4400 this_oop_map, "sanity");
4401 }
4402 }
4405 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4406 Klass* super = k->super();
4408 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4409 // in which case we don't have to register objects as finalizable
4410 if (!_has_empty_finalizer) {
4411 if (_has_finalizer ||
4412 (super != NULL && super->has_finalizer())) {
4413 k->set_has_finalizer();
4414 }
4415 }
4417 #ifdef ASSERT
4418 bool f = false;
4419 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4420 vmSymbols::void_method_signature());
4421 if (m != NULL && !m->is_empty_method()) {
4422 f = true;
4423 }
4425 // Spec doesn't prevent agent from redefinition of empty finalizer.
4426 // Despite the fact that it's generally bad idea and redefined finalizer
4427 // will not work as expected we shouldn't abort vm in this case
4428 if (!k->has_redefined_this_or_super()) {
4429 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4430 }
4431 #endif
4433 // Check if this klass supports the java.lang.Cloneable interface
4434 if (SystemDictionary::Cloneable_klass_loaded()) {
4435 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4436 k->set_is_cloneable();
4437 }
4438 }
4440 // Check if this klass has a vanilla default constructor
4441 if (super == NULL) {
4442 // java.lang.Object has empty default constructor
4443 k->set_has_vanilla_constructor();
4444 } else {
4445 if (super->has_vanilla_constructor() &&
4446 _has_vanilla_constructor) {
4447 k->set_has_vanilla_constructor();
4448 }
4449 #ifdef ASSERT
4450 bool v = false;
4451 if (super->has_vanilla_constructor()) {
4452 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4453 ), vmSymbols::void_method_signature());
4454 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4455 v = true;
4456 }
4457 }
4458 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4459 #endif
4460 }
4462 // If it cannot be fast-path allocated, set a bit in the layout helper.
4463 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4464 assert(k->size_helper() > 0, "layout_helper is initialized");
4465 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4466 || k->is_abstract() || k->is_interface()
4467 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4468 || k->size_helper() >= FastAllocateSizeLimit) {
4469 // Forbid fast-path allocation.
4470 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4471 k->set_layout_helper(lh);
4472 }
4473 }
4475 // Attach super classes and interface classes to class loader data
4476 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4477 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4478 if (defining_loader_data->is_the_null_class_loader_data()) {
4479 // Dependencies to null class loader data are implicit.
4480 return;
4481 } else {
4482 // add super class dependency
4483 Klass* super = defined_klass->super();
4484 if (super != NULL) {
4485 defining_loader_data->record_dependency(super, CHECK);
4486 }
4488 // add super interface dependencies
4489 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4490 if (local_interfaces != NULL) {
4491 int length = local_interfaces->length();
4492 for (int i = 0; i < length; i++) {
4493 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4494 }
4495 }
4496 }
4497 }
4499 // utility methods for appending an array with check for duplicates
4501 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4502 // iterate over new interfaces
4503 for (int i = 0; i < ifs->length(); i++) {
4504 Klass* e = ifs->at(i);
4505 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4506 // add new interface
4507 result->append_if_missing(e);
4508 }
4509 }
4511 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4512 instanceKlassHandle super,
4513 Array<Klass*>* local_ifs, TRAPS) {
4514 // Compute maximum size for transitive interfaces
4515 int max_transitive_size = 0;
4516 int super_size = 0;
4517 // Add superclass transitive interfaces size
4518 if (super.not_null()) {
4519 super_size = super->transitive_interfaces()->length();
4520 max_transitive_size += super_size;
4521 }
4522 // Add local interfaces' super interfaces
4523 int local_size = local_ifs->length();
4524 for (int i = 0; i < local_size; i++) {
4525 Klass* l = local_ifs->at(i);
4526 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4527 }
4528 // Finally add local interfaces
4529 max_transitive_size += local_size;
4530 // Construct array
4531 if (max_transitive_size == 0) {
4532 // no interfaces, use canonicalized array
4533 return Universe::the_empty_klass_array();
4534 } else if (max_transitive_size == super_size) {
4535 // no new local interfaces added, share superklass' transitive interface array
4536 return super->transitive_interfaces();
4537 } else if (max_transitive_size == local_size) {
4538 // only local interfaces added, share local interface array
4539 return local_ifs;
4540 } else {
4541 ResourceMark rm;
4542 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4544 // Copy down from superclass
4545 if (super.not_null()) {
4546 append_interfaces(result, super->transitive_interfaces());
4547 }
4549 // Copy down from local interfaces' superinterfaces
4550 for (int i = 0; i < local_ifs->length(); i++) {
4551 Klass* l = local_ifs->at(i);
4552 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4553 }
4554 // Finally add local interfaces
4555 append_interfaces(result, local_ifs);
4557 // length will be less than the max_transitive_size if duplicates were removed
4558 int length = result->length();
4559 assert(length <= max_transitive_size, "just checking");
4560 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4561 for (int i = 0; i < length; i++) {
4562 Klass* e = result->at(i);
4563 assert(e != NULL, "just checking");
4564 new_result->at_put(i, e);
4565 }
4566 return new_result;
4567 }
4568 }
4570 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4571 Klass* super = this_klass->super();
4572 if ((super != NULL) &&
4573 (!Reflection::verify_class_access(this_klass(), super, false))) {
4574 ResourceMark rm(THREAD);
4575 Exceptions::fthrow(
4576 THREAD_AND_LOCATION,
4577 vmSymbols::java_lang_IllegalAccessError(),
4578 "class %s cannot access its superclass %s",
4579 this_klass->external_name(),
4580 InstanceKlass::cast(super)->external_name()
4581 );
4582 return;
4583 }
4584 }
4587 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4588 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4589 int lng = local_interfaces->length();
4590 for (int i = lng - 1; i >= 0; i--) {
4591 Klass* k = local_interfaces->at(i);
4592 assert (k != NULL && k->is_interface(), "invalid interface");
4593 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4594 ResourceMark rm(THREAD);
4595 Exceptions::fthrow(
4596 THREAD_AND_LOCATION,
4597 vmSymbols::java_lang_IllegalAccessError(),
4598 "class %s cannot access its superinterface %s",
4599 this_klass->external_name(),
4600 InstanceKlass::cast(k)->external_name()
4601 );
4602 return;
4603 }
4604 }
4605 }
4608 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4609 Array<Method*>* methods = this_klass->methods();
4610 int num_methods = methods->length();
4612 // go thru each method and check if it overrides a final method
4613 for (int index = 0; index < num_methods; index++) {
4614 Method* m = methods->at(index);
4616 // skip private, static, and <init> methods
4617 if ((!m->is_private() && !m->is_static()) &&
4618 (m->name() != vmSymbols::object_initializer_name())) {
4620 Symbol* name = m->name();
4621 Symbol* signature = m->signature();
4622 Klass* k = this_klass->super();
4623 Method* super_m = NULL;
4624 while (k != NULL) {
4625 // skip supers that don't have final methods.
4626 if (k->has_final_method()) {
4627 // lookup a matching method in the super class hierarchy
4628 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4629 if (super_m == NULL) {
4630 break; // didn't find any match; get out
4631 }
4633 if (super_m->is_final() && !super_m->is_static() &&
4634 // matching method in super is final, and not static
4635 (Reflection::verify_field_access(this_klass(),
4636 super_m->method_holder(),
4637 super_m->method_holder(),
4638 super_m->access_flags(), false))
4639 // this class can access super final method and therefore override
4640 ) {
4641 ResourceMark rm(THREAD);
4642 Exceptions::fthrow(
4643 THREAD_AND_LOCATION,
4644 vmSymbols::java_lang_VerifyError(),
4645 "class %s overrides final method %s.%s",
4646 this_klass->external_name(),
4647 name->as_C_string(),
4648 signature->as_C_string()
4649 );
4650 return;
4651 }
4653 // continue to look from super_m's holder's super.
4654 k = super_m->method_holder()->super();
4655 continue;
4656 }
4658 k = k->super();
4659 }
4660 }
4661 }
4662 }
4665 // assumes that this_klass is an interface
4666 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4667 assert(this_klass->is_interface(), "not an interface");
4668 Array<Method*>* methods = this_klass->methods();
4669 int num_methods = methods->length();
4671 for (int index = 0; index < num_methods; index++) {
4672 Method* m = methods->at(index);
4673 // if m is static and not the init method, throw a verify error
4674 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4675 ResourceMark rm(THREAD);
4676 Exceptions::fthrow(
4677 THREAD_AND_LOCATION,
4678 vmSymbols::java_lang_VerifyError(),
4679 "Illegal static method %s in interface %s",
4680 m->name()->as_C_string(),
4681 this_klass->external_name()
4682 );
4683 return;
4684 }
4685 }
4686 }
4688 // utility methods for format checking
4690 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4691 if (!_need_verify) { return; }
4693 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4694 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4695 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4696 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4697 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4698 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4699 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4701 if ((is_abstract && is_final) ||
4702 (is_interface && !is_abstract) ||
4703 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4704 (!is_interface && major_gte_15 && is_annotation)) {
4705 ResourceMark rm(THREAD);
4706 Exceptions::fthrow(
4707 THREAD_AND_LOCATION,
4708 vmSymbols::java_lang_ClassFormatError(),
4709 "Illegal class modifiers in class %s: 0x%X",
4710 _class_name->as_C_string(), flags
4711 );
4712 return;
4713 }
4714 }
4716 bool ClassFileParser::has_illegal_visibility(jint flags) {
4717 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4718 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4719 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4721 return ((is_public && is_protected) ||
4722 (is_public && is_private) ||
4723 (is_protected && is_private));
4724 }
4726 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4727 u2 max_version =
4728 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4729 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4730 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4731 (major <= max_version) &&
4732 ((major != max_version) ||
4733 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4734 }
4736 void ClassFileParser::verify_legal_field_modifiers(
4737 jint flags, bool is_interface, TRAPS) {
4738 if (!_need_verify) { return; }
4740 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4741 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4742 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4743 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4744 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4745 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4746 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4747 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4748 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4750 bool is_illegal = false;
4752 if (is_interface) {
4753 if (!is_public || !is_static || !is_final || is_private ||
4754 is_protected || is_volatile || is_transient ||
4755 (major_gte_15 && is_enum)) {
4756 is_illegal = true;
4757 }
4758 } else { // not interface
4759 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4760 is_illegal = true;
4761 }
4762 }
4764 if (is_illegal) {
4765 ResourceMark rm(THREAD);
4766 Exceptions::fthrow(
4767 THREAD_AND_LOCATION,
4768 vmSymbols::java_lang_ClassFormatError(),
4769 "Illegal field modifiers in class %s: 0x%X",
4770 _class_name->as_C_string(), flags);
4771 return;
4772 }
4773 }
4775 void ClassFileParser::verify_legal_method_modifiers(
4776 jint flags, bool is_interface, Symbol* name, TRAPS) {
4777 if (!_need_verify) { return; }
4779 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4780 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4781 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4782 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4783 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4784 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4785 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4786 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4787 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4788 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4789 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4790 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4791 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4793 bool is_illegal = false;
4795 if (is_interface) {
4796 if (major_gte_8) {
4797 // Class file version is JAVA_8_VERSION or later Methods of
4798 // interfaces may set any of the flags except ACC_PROTECTED,
4799 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4800 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4801 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4802 (is_native || is_protected || is_final || is_synchronized) ||
4803 // If a specific method of a class or interface has its
4804 // ACC_ABSTRACT flag set, it must not have any of its
4805 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4806 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4807 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4808 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4809 (is_abstract && (is_private || is_static || is_strict))) {
4810 is_illegal = true;
4811 }
4812 } else if (major_gte_15) {
4813 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4814 if (!is_public || is_static || is_final || is_synchronized ||
4815 is_native || !is_abstract || is_strict) {
4816 is_illegal = true;
4817 }
4818 } else {
4819 // Class file version is pre-JAVA_1_5_VERSION
4820 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4821 is_illegal = true;
4822 }
4823 }
4824 } else { // not interface
4825 if (is_initializer) {
4826 if (is_static || is_final || is_synchronized || is_native ||
4827 is_abstract || (major_gte_15 && is_bridge)) {
4828 is_illegal = true;
4829 }
4830 } else { // not initializer
4831 if (is_abstract) {
4832 if ((is_final || is_native || is_private || is_static ||
4833 (major_gte_15 && (is_synchronized || is_strict)))) {
4834 is_illegal = true;
4835 }
4836 }
4837 if (has_illegal_visibility(flags)) {
4838 is_illegal = true;
4839 }
4840 }
4841 }
4843 if (is_illegal) {
4844 ResourceMark rm(THREAD);
4845 Exceptions::fthrow(
4846 THREAD_AND_LOCATION,
4847 vmSymbols::java_lang_ClassFormatError(),
4848 "Method %s in class %s has illegal modifiers: 0x%X",
4849 name->as_C_string(), _class_name->as_C_string(), flags);
4850 return;
4851 }
4852 }
4854 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4855 assert(_need_verify, "only called when _need_verify is true");
4856 int i = 0;
4857 int count = length >> 2;
4858 for (int k=0; k<count; k++) {
4859 unsigned char b0 = buffer[i];
4860 unsigned char b1 = buffer[i+1];
4861 unsigned char b2 = buffer[i+2];
4862 unsigned char b3 = buffer[i+3];
4863 // For an unsigned char v,
4864 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4865 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4866 unsigned char res = b0 | b0 - 1 |
4867 b1 | b1 - 1 |
4868 b2 | b2 - 1 |
4869 b3 | b3 - 1;
4870 if (res >= 128) break;
4871 i += 4;
4872 }
4873 for(; i < length; i++) {
4874 unsigned short c;
4875 // no embedded zeros
4876 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4877 if(buffer[i] < 128) {
4878 continue;
4879 }
4880 if ((i + 5) < length) { // see if it's legal supplementary character
4881 if (UTF8::is_supplementary_character(&buffer[i])) {
4882 c = UTF8::get_supplementary_character(&buffer[i]);
4883 i += 5;
4884 continue;
4885 }
4886 }
4887 switch (buffer[i] >> 4) {
4888 default: break;
4889 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4890 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4891 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4892 c = (buffer[i] & 0x1F) << 6;
4893 i++;
4894 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4895 c += buffer[i] & 0x3F;
4896 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4897 // for classes with major > 47, c must a null or a character in its shortest form
4898 break;
4899 }
4900 }
4901 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4902 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4903 c = (buffer[i] & 0xF) << 12;
4904 i += 2;
4905 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4906 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4907 if (_major_version <= 47 || c >= 0x800) {
4908 // for classes with major > 47, c must be in its shortest form
4909 break;
4910 }
4911 }
4912 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4913 } // end of switch
4914 } // end of for
4915 }
4917 // Checks if name is a legal class name.
4918 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4919 if (!_need_verify || _relax_verify) { return; }
4921 char buf[fixed_buffer_size];
4922 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4923 unsigned int length = name->utf8_length();
4924 bool legal = false;
4926 if (length > 0) {
4927 char* p;
4928 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4929 p = skip_over_field_signature(bytes, false, length, CHECK);
4930 legal = (p != NULL) && ((p - bytes) == (int)length);
4931 } else if (_major_version < JAVA_1_5_VERSION) {
4932 if (bytes[0] != '<') {
4933 p = skip_over_field_name(bytes, true, length);
4934 legal = (p != NULL) && ((p - bytes) == (int)length);
4935 }
4936 } else {
4937 // 4900761: relax the constraints based on JSR202 spec
4938 // Class names may be drawn from the entire Unicode character set.
4939 // Identifiers between '/' must be unqualified names.
4940 // The utf8 string has been verified when parsing cpool entries.
4941 legal = verify_unqualified_name(bytes, length, LegalClass);
4942 }
4943 }
4944 if (!legal) {
4945 ResourceMark rm(THREAD);
4946 Exceptions::fthrow(
4947 THREAD_AND_LOCATION,
4948 vmSymbols::java_lang_ClassFormatError(),
4949 "Illegal class name \"%s\" in class file %s", bytes,
4950 _class_name->as_C_string()
4951 );
4952 return;
4953 }
4954 }
4956 // Checks if name is a legal field name.
4957 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4958 if (!_need_verify || _relax_verify) { return; }
4960 char buf[fixed_buffer_size];
4961 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4962 unsigned int length = name->utf8_length();
4963 bool legal = false;
4965 if (length > 0) {
4966 if (_major_version < JAVA_1_5_VERSION) {
4967 if (bytes[0] != '<') {
4968 char* p = skip_over_field_name(bytes, false, length);
4969 legal = (p != NULL) && ((p - bytes) == (int)length);
4970 }
4971 } else {
4972 // 4881221: relax the constraints based on JSR202 spec
4973 legal = verify_unqualified_name(bytes, length, LegalField);
4974 }
4975 }
4977 if (!legal) {
4978 ResourceMark rm(THREAD);
4979 Exceptions::fthrow(
4980 THREAD_AND_LOCATION,
4981 vmSymbols::java_lang_ClassFormatError(),
4982 "Illegal field name \"%s\" in class %s", bytes,
4983 _class_name->as_C_string()
4984 );
4985 return;
4986 }
4987 }
4989 // Checks if name is a legal method name.
4990 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4991 if (!_need_verify || _relax_verify) { return; }
4993 assert(name != NULL, "method name is null");
4994 char buf[fixed_buffer_size];
4995 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4996 unsigned int length = name->utf8_length();
4997 bool legal = false;
4999 if (length > 0) {
5000 if (bytes[0] == '<') {
5001 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5002 legal = true;
5003 }
5004 } else if (_major_version < JAVA_1_5_VERSION) {
5005 char* p;
5006 p = skip_over_field_name(bytes, false, length);
5007 legal = (p != NULL) && ((p - bytes) == (int)length);
5008 } else {
5009 // 4881221: relax the constraints based on JSR202 spec
5010 legal = verify_unqualified_name(bytes, length, LegalMethod);
5011 }
5012 }
5014 if (!legal) {
5015 ResourceMark rm(THREAD);
5016 Exceptions::fthrow(
5017 THREAD_AND_LOCATION,
5018 vmSymbols::java_lang_ClassFormatError(),
5019 "Illegal method name \"%s\" in class %s", bytes,
5020 _class_name->as_C_string()
5021 );
5022 return;
5023 }
5024 }
5027 // Checks if signature is a legal field signature.
5028 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5029 if (!_need_verify) { return; }
5031 char buf[fixed_buffer_size];
5032 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5033 unsigned int length = signature->utf8_length();
5034 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5036 if (p == NULL || (p - bytes) != (int)length) {
5037 throwIllegalSignature("Field", name, signature, CHECK);
5038 }
5039 }
5041 // Checks if signature is a legal method signature.
5042 // Returns number of parameters
5043 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5044 if (!_need_verify) {
5045 // make sure caller's args_size will be less than 0 even for non-static
5046 // method so it will be recomputed in compute_size_of_parameters().
5047 return -2;
5048 }
5050 unsigned int args_size = 0;
5051 char buf[fixed_buffer_size];
5052 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5053 unsigned int length = signature->utf8_length();
5054 char* nextp;
5056 // The first character must be a '('
5057 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5058 length--;
5059 // Skip over legal field signatures
5060 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5061 while ((length > 0) && (nextp != NULL)) {
5062 args_size++;
5063 if (p[0] == 'J' || p[0] == 'D') {
5064 args_size++;
5065 }
5066 length -= nextp - p;
5067 p = nextp;
5068 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5069 }
5070 // The first non-signature thing better be a ')'
5071 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5072 length--;
5073 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5074 // All internal methods must return void
5075 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5076 return args_size;
5077 }
5078 } else {
5079 // Now we better just have a return value
5080 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5081 if (nextp && ((int)length == (nextp - p))) {
5082 return args_size;
5083 }
5084 }
5085 }
5086 }
5087 // Report error
5088 throwIllegalSignature("Method", name, signature, CHECK_0);
5089 return 0;
5090 }
5093 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5094 // Method names also may not contain the characters '<' or '>', unless <init>
5095 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5096 // method. Because these names have been checked as special cases before
5097 // calling this method in verify_legal_method_name.
5098 bool ClassFileParser::verify_unqualified_name(
5099 char* name, unsigned int length, int type) {
5100 jchar ch;
5102 for (char* p = name; p != name + length; ) {
5103 ch = *p;
5104 if (ch < 128) {
5105 p++;
5106 if (ch == '.' || ch == ';' || ch == '[' ) {
5107 return false; // do not permit '.', ';', or '['
5108 }
5109 if (type != LegalClass && ch == '/') {
5110 return false; // do not permit '/' unless it's class name
5111 }
5112 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5113 return false; // do not permit '<' or '>' in method names
5114 }
5115 } else {
5116 char* tmp_p = UTF8::next(p, &ch);
5117 p = tmp_p;
5118 }
5119 }
5120 return true;
5121 }
5124 // Take pointer to a string. Skip over the longest part of the string that could
5125 // be taken as a fieldname. Allow '/' if slash_ok is true.
5126 // Return a pointer to just past the fieldname.
5127 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5128 // being true, we saw consecutive slashes (meaning we were looking for a
5129 // qualified path but found something that was badly-formed).
5130 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5131 char* p;
5132 jchar ch;
5133 jboolean last_is_slash = false;
5134 jboolean not_first_ch = false;
5136 for (p = name; p != name + length; not_first_ch = true) {
5137 char* old_p = p;
5138 ch = *p;
5139 if (ch < 128) {
5140 p++;
5141 // quick check for ascii
5142 if ((ch >= 'a' && ch <= 'z') ||
5143 (ch >= 'A' && ch <= 'Z') ||
5144 (ch == '_' || ch == '$') ||
5145 (not_first_ch && ch >= '0' && ch <= '9')) {
5146 last_is_slash = false;
5147 continue;
5148 }
5149 if (slash_ok && ch == '/') {
5150 if (last_is_slash) {
5151 return NULL; // Don't permit consecutive slashes
5152 }
5153 last_is_slash = true;
5154 continue;
5155 }
5156 } else {
5157 jint unicode_ch;
5158 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5159 p = tmp_p;
5160 last_is_slash = false;
5161 // Check if ch is Java identifier start or is Java identifier part
5162 // 4672820: call java.lang.Character methods directly without generating separate tables.
5163 EXCEPTION_MARK;
5164 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5166 // return value
5167 JavaValue result(T_BOOLEAN);
5168 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5169 JavaCallArguments args;
5170 args.push_int(unicode_ch);
5172 // public static boolean isJavaIdentifierStart(char ch);
5173 JavaCalls::call_static(&result,
5174 klass,
5175 vmSymbols::isJavaIdentifierStart_name(),
5176 vmSymbols::int_bool_signature(),
5177 &args,
5178 THREAD);
5180 if (HAS_PENDING_EXCEPTION) {
5181 CLEAR_PENDING_EXCEPTION;
5182 return 0;
5183 }
5184 if (result.get_jboolean()) {
5185 continue;
5186 }
5188 if (not_first_ch) {
5189 // public static boolean isJavaIdentifierPart(char ch);
5190 JavaCalls::call_static(&result,
5191 klass,
5192 vmSymbols::isJavaIdentifierPart_name(),
5193 vmSymbols::int_bool_signature(),
5194 &args,
5195 THREAD);
5197 if (HAS_PENDING_EXCEPTION) {
5198 CLEAR_PENDING_EXCEPTION;
5199 return 0;
5200 }
5202 if (result.get_jboolean()) {
5203 continue;
5204 }
5205 }
5206 }
5207 return (not_first_ch) ? old_p : NULL;
5208 }
5209 return (not_first_ch) ? p : NULL;
5210 }
5213 // Take pointer to a string. Skip over the longest part of the string that could
5214 // be taken as a field signature. Allow "void" if void_ok.
5215 // Return a pointer to just past the signature.
5216 // Return NULL if no legal signature is found.
5217 char* ClassFileParser::skip_over_field_signature(char* signature,
5218 bool void_ok,
5219 unsigned int length,
5220 TRAPS) {
5221 unsigned int array_dim = 0;
5222 while (length > 0) {
5223 switch (signature[0]) {
5224 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5225 case JVM_SIGNATURE_BOOLEAN:
5226 case JVM_SIGNATURE_BYTE:
5227 case JVM_SIGNATURE_CHAR:
5228 case JVM_SIGNATURE_SHORT:
5229 case JVM_SIGNATURE_INT:
5230 case JVM_SIGNATURE_FLOAT:
5231 case JVM_SIGNATURE_LONG:
5232 case JVM_SIGNATURE_DOUBLE:
5233 return signature + 1;
5234 case JVM_SIGNATURE_CLASS: {
5235 if (_major_version < JAVA_1_5_VERSION) {
5236 // Skip over the class name if one is there
5237 char* p = skip_over_field_name(signature + 1, true, --length);
5239 // The next character better be a semicolon
5240 if (p && (p - signature) > 1 && p[0] == ';') {
5241 return p + 1;
5242 }
5243 } else {
5244 // 4900761: For class version > 48, any unicode is allowed in class name.
5245 length--;
5246 signature++;
5247 while (length > 0 && signature[0] != ';') {
5248 if (signature[0] == '.') {
5249 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5250 }
5251 length--;
5252 signature++;
5253 }
5254 if (signature[0] == ';') { return signature + 1; }
5255 }
5257 return NULL;
5258 }
5259 case JVM_SIGNATURE_ARRAY:
5260 array_dim++;
5261 if (array_dim > 255) {
5262 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5263 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5264 }
5265 // The rest of what's there better be a legal signature
5266 signature++;
5267 length--;
5268 void_ok = false;
5269 break;
5271 default:
5272 return NULL;
5273 }
5274 }
5275 return NULL;
5276 }