Mon, 06 Aug 2012 15:54:45 -0400
7116786: RFE: Detailed information on VerifyErrors
Summary: Provide additional detail in VerifyError messages
Reviewed-by: sspitsyn, acorn
1 /*
2 * Copyright (c) 1997, 2012, 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/javaClasses.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/verificationType.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPoolOop.hpp"
39 #include "oops/fieldStreams.hpp"
40 #include "oops/instanceKlass.hpp"
41 #include "oops/instanceMirrorKlass.hpp"
42 #include "oops/klass.inline.hpp"
43 #include "oops/klassOop.hpp"
44 #include "oops/klassVtable.hpp"
45 #include "oops/methodOop.hpp"
46 #include "oops/symbol.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "prims/jvmtiThreadState.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/perfData.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/timer.hpp"
54 #include "services/classLoadingService.hpp"
55 #include "services/threadService.hpp"
57 // We generally try to create the oops directly when parsing, rather than
58 // allocating temporary data structures and copying the bytes twice. A
59 // temporary area is only needed when parsing utf8 entries in the constant
60 // pool and when parsing line number tables.
62 // We add assert in debug mode when class format is not checked.
64 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
65 #define JAVA_MIN_SUPPORTED_VERSION 45
66 #define JAVA_MAX_SUPPORTED_VERSION 51
67 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
69 // Used for two backward compatibility reasons:
70 // - to check for new additions to the class file format in JDK1.5
71 // - to check for bug fixes in the format checker in JDK1.5
72 #define JAVA_1_5_VERSION 49
74 // Used for backward compatibility reasons:
75 // - to check for javac bug fixes that happened after 1.5
76 // - also used as the max version when running in jdk6
77 #define JAVA_6_VERSION 50
79 // Used for backward compatibility reasons:
80 // - to check NameAndType_info signatures more aggressively
81 #define JAVA_7_VERSION 51
84 void ClassFileParser::parse_constant_pool_entries(Handle class_loader, constantPoolHandle cp, int length, TRAPS) {
85 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
86 // this function (_current can be allocated in a register, with scalar
87 // replacement of aggregates). The _current pointer is copied back to
88 // stream() when this function returns. DON'T call another method within
89 // this method that uses stream().
90 ClassFileStream* cfs0 = stream();
91 ClassFileStream cfs1 = *cfs0;
92 ClassFileStream* cfs = &cfs1;
93 #ifdef ASSERT
94 assert(cfs->allocated_on_stack(),"should be local");
95 u1* old_current = cfs0->current();
96 #endif
98 // Used for batching symbol allocations.
99 const char* names[SymbolTable::symbol_alloc_batch_size];
100 int lengths[SymbolTable::symbol_alloc_batch_size];
101 int indices[SymbolTable::symbol_alloc_batch_size];
102 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
103 int names_count = 0;
105 // parsing Index 0 is unused
106 for (int index = 1; index < length; index++) {
107 // Each of the following case guarantees one more byte in the stream
108 // for the following tag or the access_flags following constant pool,
109 // so we don't need bounds-check for reading tag.
110 u1 tag = cfs->get_u1_fast();
111 switch (tag) {
112 case JVM_CONSTANT_Class :
113 {
114 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
115 u2 name_index = cfs->get_u2_fast();
116 cp->klass_index_at_put(index, name_index);
117 }
118 break;
119 case JVM_CONSTANT_Fieldref :
120 {
121 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
122 u2 class_index = cfs->get_u2_fast();
123 u2 name_and_type_index = cfs->get_u2_fast();
124 cp->field_at_put(index, class_index, name_and_type_index);
125 }
126 break;
127 case JVM_CONSTANT_Methodref :
128 {
129 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
130 u2 class_index = cfs->get_u2_fast();
131 u2 name_and_type_index = cfs->get_u2_fast();
132 cp->method_at_put(index, class_index, name_and_type_index);
133 }
134 break;
135 case JVM_CONSTANT_InterfaceMethodref :
136 {
137 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
138 u2 class_index = cfs->get_u2_fast();
139 u2 name_and_type_index = cfs->get_u2_fast();
140 cp->interface_method_at_put(index, class_index, name_and_type_index);
141 }
142 break;
143 case JVM_CONSTANT_String :
144 {
145 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
146 u2 string_index = cfs->get_u2_fast();
147 cp->string_index_at_put(index, string_index);
148 }
149 break;
150 case JVM_CONSTANT_MethodHandle :
151 case JVM_CONSTANT_MethodType :
152 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
153 classfile_parse_error(
154 "Class file version does not support constant tag %u in class file %s",
155 tag, CHECK);
156 }
157 if (!EnableInvokeDynamic) {
158 classfile_parse_error(
159 "This JVM does not support constant tag %u in class file %s",
160 tag, CHECK);
161 }
162 if (tag == JVM_CONSTANT_MethodHandle) {
163 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
164 u1 ref_kind = cfs->get_u1_fast();
165 u2 method_index = cfs->get_u2_fast();
166 cp->method_handle_index_at_put(index, ref_kind, method_index);
167 } else if (tag == JVM_CONSTANT_MethodType) {
168 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
169 u2 signature_index = cfs->get_u2_fast();
170 cp->method_type_index_at_put(index, signature_index);
171 } else {
172 ShouldNotReachHere();
173 }
174 break;
175 case JVM_CONSTANT_InvokeDynamic :
176 {
177 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
178 classfile_parse_error(
179 "Class file version does not support constant tag %u in class file %s",
180 tag, CHECK);
181 }
182 if (!EnableInvokeDynamic) {
183 classfile_parse_error(
184 "This JVM does not support constant tag %u in class file %s",
185 tag, CHECK);
186 }
187 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
188 u2 bootstrap_specifier_index = cfs->get_u2_fast();
189 u2 name_and_type_index = cfs->get_u2_fast();
190 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
191 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
192 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
193 }
194 break;
195 case JVM_CONSTANT_Integer :
196 {
197 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
198 u4 bytes = cfs->get_u4_fast();
199 cp->int_at_put(index, (jint) bytes);
200 }
201 break;
202 case JVM_CONSTANT_Float :
203 {
204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
205 u4 bytes = cfs->get_u4_fast();
206 cp->float_at_put(index, *(jfloat*)&bytes);
207 }
208 break;
209 case JVM_CONSTANT_Long :
210 // A mangled type might cause you to overrun allocated memory
211 guarantee_property(index+1 < length,
212 "Invalid constant pool entry %u in class file %s",
213 index, CHECK);
214 {
215 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
216 u8 bytes = cfs->get_u8_fast();
217 cp->long_at_put(index, bytes);
218 }
219 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
220 break;
221 case JVM_CONSTANT_Double :
222 // A mangled type might cause you to overrun allocated memory
223 guarantee_property(index+1 < length,
224 "Invalid constant pool entry %u in class file %s",
225 index, CHECK);
226 {
227 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
228 u8 bytes = cfs->get_u8_fast();
229 cp->double_at_put(index, *(jdouble*)&bytes);
230 }
231 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
232 break;
233 case JVM_CONSTANT_NameAndType :
234 {
235 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
236 u2 name_index = cfs->get_u2_fast();
237 u2 signature_index = cfs->get_u2_fast();
238 cp->name_and_type_at_put(index, name_index, signature_index);
239 }
240 break;
241 case JVM_CONSTANT_Utf8 :
242 {
243 cfs->guarantee_more(2, CHECK); // utf8_length
244 u2 utf8_length = cfs->get_u2_fast();
245 u1* utf8_buffer = cfs->get_u1_buffer();
246 assert(utf8_buffer != NULL, "null utf8 buffer");
247 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
248 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
249 cfs->skip_u1_fast(utf8_length);
251 // Before storing the symbol, make sure it's legal
252 if (_need_verify) {
253 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
254 }
256 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
257 Handle patch = clear_cp_patch_at(index);
258 guarantee_property(java_lang_String::is_instance(patch()),
259 "Illegal utf8 patch at %d in class file %s",
260 index, CHECK);
261 char* str = java_lang_String::as_utf8_string(patch());
262 // (could use java_lang_String::as_symbol instead, but might as well batch them)
263 utf8_buffer = (u1*) str;
264 utf8_length = (int) strlen(str);
265 }
267 unsigned int hash;
268 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
269 if (result == NULL) {
270 names[names_count] = (char*)utf8_buffer;
271 lengths[names_count] = utf8_length;
272 indices[names_count] = index;
273 hashValues[names_count++] = hash;
274 if (names_count == SymbolTable::symbol_alloc_batch_size) {
275 SymbolTable::new_symbols(class_loader, cp, names_count, names, lengths, indices, hashValues, CHECK);
276 names_count = 0;
277 }
278 } else {
279 cp->symbol_at_put(index, result);
280 }
281 }
282 break;
283 default:
284 classfile_parse_error(
285 "Unknown constant tag %u in class file %s", tag, CHECK);
286 break;
287 }
288 }
290 // Allocate the remaining symbols
291 if (names_count > 0) {
292 SymbolTable::new_symbols(class_loader, cp, names_count, names, lengths, indices, hashValues, CHECK);
293 }
295 // Copy _current pointer of local copy back to stream().
296 #ifdef ASSERT
297 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
298 #endif
299 cfs0->set_current(cfs1.current());
300 }
302 // This class unreferences constant pool symbols if an error has occurred
303 // while parsing the class before it is assigned into the class.
304 // If it gets an error after that it is unloaded and the constant pool will
305 // be cleaned up then.
306 class ConstantPoolCleaner : public StackObj {
307 constantPoolHandle _cphandle;
308 bool _in_error;
309 public:
310 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
311 ~ConstantPoolCleaner() {
312 if (_in_error && _cphandle.not_null()) {
313 _cphandle->unreference_symbols();
314 }
315 }
316 void set_in_error(bool clean) { _in_error = clean; }
317 };
319 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
321 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
322 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
323 return cp->symbol_at(index);
324 else
325 return NULL;
326 }
328 constantPoolHandle ClassFileParser::parse_constant_pool(Handle class_loader, TRAPS) {
329 ClassFileStream* cfs = stream();
330 constantPoolHandle nullHandle;
332 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
333 u2 length = cfs->get_u2_fast();
334 guarantee_property(
335 length >= 1, "Illegal constant pool size %u in class file %s",
336 length, CHECK_(nullHandle));
337 constantPoolOop constant_pool =
338 oopFactory::new_constantPool(length,
339 oopDesc::IsSafeConc,
340 CHECK_(nullHandle));
341 constantPoolHandle cp (THREAD, constant_pool);
343 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
344 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
346 // parsing constant pool entries
347 parse_constant_pool_entries(class_loader, cp, length, CHECK_(nullHandle));
349 int index = 1; // declared outside of loops for portability
351 // first verification pass - validate cross references and fixup class and string constants
352 for (index = 1; index < length; index++) { // Index 0 is unused
353 jbyte tag = cp->tag_at(index).value();
354 switch (tag) {
355 case JVM_CONSTANT_Class :
356 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
357 break;
358 case JVM_CONSTANT_Fieldref :
359 // fall through
360 case JVM_CONSTANT_Methodref :
361 // fall through
362 case JVM_CONSTANT_InterfaceMethodref : {
363 if (!_need_verify) break;
364 int klass_ref_index = cp->klass_ref_index_at(index);
365 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
366 check_property(valid_cp_range(klass_ref_index, length) &&
367 is_klass_reference(cp, klass_ref_index),
368 "Invalid constant pool index %u in class file %s",
369 klass_ref_index,
370 CHECK_(nullHandle));
371 check_property(valid_cp_range(name_and_type_ref_index, length) &&
372 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
373 "Invalid constant pool index %u in class file %s",
374 name_and_type_ref_index,
375 CHECK_(nullHandle));
376 break;
377 }
378 case JVM_CONSTANT_String :
379 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
380 break;
381 case JVM_CONSTANT_Integer :
382 break;
383 case JVM_CONSTANT_Float :
384 break;
385 case JVM_CONSTANT_Long :
386 case JVM_CONSTANT_Double :
387 index++;
388 check_property(
389 (index < length && cp->tag_at(index).is_invalid()),
390 "Improper constant pool long/double index %u in class file %s",
391 index, CHECK_(nullHandle));
392 break;
393 case JVM_CONSTANT_NameAndType : {
394 if (!_need_verify) break;
395 int name_ref_index = cp->name_ref_index_at(index);
396 int signature_ref_index = cp->signature_ref_index_at(index);
397 check_property(
398 valid_cp_range(name_ref_index, length) &&
399 cp->tag_at(name_ref_index).is_utf8(),
400 "Invalid constant pool index %u in class file %s",
401 name_ref_index, CHECK_(nullHandle));
402 check_property(
403 valid_cp_range(signature_ref_index, length) &&
404 cp->tag_at(signature_ref_index).is_utf8(),
405 "Invalid constant pool index %u in class file %s",
406 signature_ref_index, CHECK_(nullHandle));
407 break;
408 }
409 case JVM_CONSTANT_Utf8 :
410 break;
411 case JVM_CONSTANT_UnresolvedClass : // fall-through
412 case JVM_CONSTANT_UnresolvedClassInError:
413 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
414 break;
415 case JVM_CONSTANT_ClassIndex :
416 {
417 int class_index = cp->klass_index_at(index);
418 check_property(
419 valid_cp_range(class_index, length) &&
420 cp->tag_at(class_index).is_utf8(),
421 "Invalid constant pool index %u in class file %s",
422 class_index, CHECK_(nullHandle));
423 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
424 }
425 break;
426 case JVM_CONSTANT_UnresolvedString :
427 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
428 break;
429 case JVM_CONSTANT_StringIndex :
430 {
431 int string_index = cp->string_index_at(index);
432 check_property(
433 valid_cp_range(string_index, length) &&
434 cp->tag_at(string_index).is_utf8(),
435 "Invalid constant pool index %u in class file %s",
436 string_index, CHECK_(nullHandle));
437 Symbol* sym = cp->symbol_at(string_index);
438 cp->unresolved_string_at_put(index, sym);
439 }
440 break;
441 case JVM_CONSTANT_MethodHandle :
442 {
443 int ref_index = cp->method_handle_index_at(index);
444 check_property(
445 valid_cp_range(ref_index, length) &&
446 EnableInvokeDynamic,
447 "Invalid constant pool index %u in class file %s",
448 ref_index, CHECK_(nullHandle));
449 constantTag tag = cp->tag_at(ref_index);
450 int ref_kind = cp->method_handle_ref_kind_at(index);
451 switch (ref_kind) {
452 case JVM_REF_getField:
453 case JVM_REF_getStatic:
454 case JVM_REF_putField:
455 case JVM_REF_putStatic:
456 check_property(
457 tag.is_field(),
458 "Invalid constant pool index %u in class file %s (not a field)",
459 ref_index, CHECK_(nullHandle));
460 break;
461 case JVM_REF_invokeVirtual:
462 case JVM_REF_invokeStatic:
463 case JVM_REF_invokeSpecial:
464 case JVM_REF_newInvokeSpecial:
465 check_property(
466 tag.is_method(),
467 "Invalid constant pool index %u in class file %s (not a method)",
468 ref_index, CHECK_(nullHandle));
469 break;
470 case JVM_REF_invokeInterface:
471 check_property(
472 tag.is_interface_method(),
473 "Invalid constant pool index %u in class file %s (not an interface method)",
474 ref_index, CHECK_(nullHandle));
475 break;
476 default:
477 classfile_parse_error(
478 "Bad method handle kind at constant pool index %u in class file %s",
479 index, CHECK_(nullHandle));
480 }
481 // Keep the ref_index unchanged. It will be indirected at link-time.
482 }
483 break;
484 case JVM_CONSTANT_MethodType :
485 {
486 int ref_index = cp->method_type_index_at(index);
487 check_property(
488 valid_cp_range(ref_index, length) &&
489 cp->tag_at(ref_index).is_utf8() &&
490 EnableInvokeDynamic,
491 "Invalid constant pool index %u in class file %s",
492 ref_index, CHECK_(nullHandle));
493 }
494 break;
495 case JVM_CONSTANT_InvokeDynamic :
496 {
497 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
498 check_property(valid_cp_range(name_and_type_ref_index, length) &&
499 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
500 "Invalid constant pool index %u in class file %s",
501 name_and_type_ref_index,
502 CHECK_(nullHandle));
503 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
504 break;
505 }
506 default:
507 fatal(err_msg("bad constant pool tag value %u",
508 cp->tag_at(index).value()));
509 ShouldNotReachHere();
510 break;
511 } // end of switch
512 } // end of for
514 if (_cp_patches != NULL) {
515 // need to treat this_class specially...
516 assert(EnableInvokeDynamic, "");
517 int this_class_index;
518 {
519 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
520 u1* mark = cfs->current();
521 u2 flags = cfs->get_u2_fast();
522 this_class_index = cfs->get_u2_fast();
523 cfs->set_current(mark); // revert to mark
524 }
526 for (index = 1; index < length; index++) { // Index 0 is unused
527 if (has_cp_patch_at(index)) {
528 guarantee_property(index != this_class_index,
529 "Illegal constant pool patch to self at %d in class file %s",
530 index, CHECK_(nullHandle));
531 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
532 }
533 }
534 // Ensure that all the patches have been used.
535 for (index = 0; index < _cp_patches->length(); index++) {
536 guarantee_property(!has_cp_patch_at(index),
537 "Unused constant pool patch at %d in class file %s",
538 index, CHECK_(nullHandle));
539 }
540 }
542 if (!_need_verify) {
543 cp_in_error.set_in_error(false);
544 return cp;
545 }
547 // second verification pass - checks the strings are of the right format.
548 // but not yet to the other entries
549 for (index = 1; index < length; index++) {
550 jbyte tag = cp->tag_at(index).value();
551 switch (tag) {
552 case JVM_CONSTANT_UnresolvedClass: {
553 Symbol* class_name = cp->unresolved_klass_at(index);
554 // check the name, even if _cp_patches will overwrite it
555 verify_legal_class_name(class_name, CHECK_(nullHandle));
556 break;
557 }
558 case JVM_CONSTANT_NameAndType: {
559 if (_need_verify && _major_version >= JAVA_7_VERSION) {
560 int sig_index = cp->signature_ref_index_at(index);
561 int name_index = cp->name_ref_index_at(index);
562 Symbol* name = cp->symbol_at(name_index);
563 Symbol* sig = cp->symbol_at(sig_index);
564 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
565 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
566 } else {
567 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
568 }
569 }
570 break;
571 }
572 case JVM_CONSTANT_InvokeDynamic:
573 case JVM_CONSTANT_Fieldref:
574 case JVM_CONSTANT_Methodref:
575 case JVM_CONSTANT_InterfaceMethodref: {
576 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
577 // already verified to be utf8
578 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
579 // already verified to be utf8
580 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
581 Symbol* name = cp->symbol_at(name_ref_index);
582 Symbol* signature = cp->symbol_at(signature_ref_index);
583 if (tag == JVM_CONSTANT_Fieldref) {
584 verify_legal_field_name(name, CHECK_(nullHandle));
585 if (_need_verify && _major_version >= JAVA_7_VERSION) {
586 // Signature is verified above, when iterating NameAndType_info.
587 // Need only to be sure it's the right type.
588 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
589 throwIllegalSignature(
590 "Field", name, signature, CHECK_(nullHandle));
591 }
592 } else {
593 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
594 }
595 } else {
596 verify_legal_method_name(name, CHECK_(nullHandle));
597 if (_need_verify && _major_version >= JAVA_7_VERSION) {
598 // Signature is verified above, when iterating NameAndType_info.
599 // Need only to be sure it's the right type.
600 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
601 throwIllegalSignature(
602 "Method", name, signature, CHECK_(nullHandle));
603 }
604 } else {
605 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
606 }
607 if (tag == JVM_CONSTANT_Methodref) {
608 // 4509014: If a class method name begins with '<', it must be "<init>".
609 assert(name != NULL, "method name in constant pool is null");
610 unsigned int name_len = name->utf8_length();
611 assert(name_len > 0, "bad method name"); // already verified as legal name
612 if (name->byte_at(0) == '<') {
613 if (name != vmSymbols::object_initializer_name()) {
614 classfile_parse_error(
615 "Bad method name at constant pool index %u in class file %s",
616 name_ref_index, CHECK_(nullHandle));
617 }
618 }
619 }
620 }
621 break;
622 }
623 case JVM_CONSTANT_MethodHandle: {
624 int ref_index = cp->method_handle_index_at(index);
625 int ref_kind = cp->method_handle_ref_kind_at(index);
626 switch (ref_kind) {
627 case JVM_REF_invokeVirtual:
628 case JVM_REF_invokeStatic:
629 case JVM_REF_invokeSpecial:
630 case JVM_REF_newInvokeSpecial:
631 {
632 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
633 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
634 Symbol* name = cp->symbol_at(name_ref_index);
635 if (ref_kind == JVM_REF_newInvokeSpecial) {
636 if (name != vmSymbols::object_initializer_name()) {
637 classfile_parse_error(
638 "Bad constructor name at constant pool index %u in class file %s",
639 name_ref_index, CHECK_(nullHandle));
640 }
641 } else {
642 if (name == vmSymbols::object_initializer_name()) {
643 classfile_parse_error(
644 "Bad method name at constant pool index %u in class file %s",
645 name_ref_index, CHECK_(nullHandle));
646 }
647 }
648 }
649 break;
650 // Other ref_kinds are already fully checked in previous pass.
651 }
652 break;
653 }
654 case JVM_CONSTANT_MethodType: {
655 Symbol* no_name = vmSymbols::type_name(); // place holder
656 Symbol* signature = cp->method_type_signature_at(index);
657 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
658 break;
659 }
660 case JVM_CONSTANT_Utf8: {
661 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
662 }
663 } // end of switch
664 } // end of for
666 cp_in_error.set_in_error(false);
667 return cp;
668 }
671 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
672 assert(EnableInvokeDynamic, "");
673 BasicType patch_type = T_VOID;
674 switch (cp->tag_at(index).value()) {
676 case JVM_CONSTANT_UnresolvedClass :
677 // Patching a class means pre-resolving it.
678 // The name in the constant pool is ignored.
679 if (java_lang_Class::is_instance(patch())) {
680 guarantee_property(!java_lang_Class::is_primitive(patch()),
681 "Illegal class patch at %d in class file %s",
682 index, CHECK);
683 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
684 } else {
685 guarantee_property(java_lang_String::is_instance(patch()),
686 "Illegal class patch at %d in class file %s",
687 index, CHECK);
688 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
689 cp->unresolved_klass_at_put(index, name);
690 }
691 break;
693 case JVM_CONSTANT_UnresolvedString :
694 // Patching a string means pre-resolving it.
695 // The spelling in the constant pool is ignored.
696 // The constant reference may be any object whatever.
697 // If it is not a real interned string, the constant is referred
698 // to as a "pseudo-string", and must be presented to the CP
699 // explicitly, because it may require scavenging.
700 cp->pseudo_string_at_put(index, patch());
701 break;
703 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
704 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
705 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
706 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
707 patch_prim:
708 {
709 jvalue value;
710 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
711 guarantee_property(value_type == patch_type,
712 "Illegal primitive patch at %d in class file %s",
713 index, CHECK);
714 switch (value_type) {
715 case T_INT: cp->int_at_put(index, value.i); break;
716 case T_FLOAT: cp->float_at_put(index, value.f); break;
717 case T_LONG: cp->long_at_put(index, value.j); break;
718 case T_DOUBLE: cp->double_at_put(index, value.d); break;
719 default: assert(false, "");
720 }
721 }
722 break;
724 default:
725 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
726 guarantee_property(!has_cp_patch_at(index),
727 "Illegal unexpected patch at %d in class file %s",
728 index, CHECK);
729 return;
730 }
732 // On fall-through, mark the patch as used.
733 clear_cp_patch_at(index);
734 }
738 class NameSigHash: public ResourceObj {
739 public:
740 Symbol* _name; // name
741 Symbol* _sig; // signature
742 NameSigHash* _next; // Next entry in hash table
743 };
746 #define HASH_ROW_SIZE 256
748 unsigned int hash(Symbol* name, Symbol* sig) {
749 unsigned int raw_hash = 0;
750 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
751 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
753 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
754 }
757 void initialize_hashtable(NameSigHash** table) {
758 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
759 }
761 // Return false if the name/sig combination is found in table.
762 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
763 // The old format checker uses heap sort to find duplicates.
764 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
765 // of table since we don't expect Symbol*'s to move.
766 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
767 assert(name != NULL, "name in constant pool is NULL");
769 // First lookup for duplicates
770 int index = hash(name, sig);
771 NameSigHash* entry = table[index];
772 while (entry != NULL) {
773 if (entry->_name == name && entry->_sig == sig) {
774 return false;
775 }
776 entry = entry->_next;
777 }
779 // No duplicate is found, allocate a new entry and fill it.
780 entry = new NameSigHash();
781 entry->_name = name;
782 entry->_sig = sig;
784 // Insert into hash table
785 entry->_next = table[index];
786 table[index] = entry;
788 return true;
789 }
792 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
793 int length,
794 Handle class_loader,
795 Handle protection_domain,
796 Symbol* class_name,
797 TRAPS) {
798 ClassFileStream* cfs = stream();
799 assert(length > 0, "only called for length>0");
800 objArrayHandle nullHandle;
801 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
802 objArrayHandle interfaces (THREAD, interface_oop);
804 int index;
805 for (index = 0; index < length; index++) {
806 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
807 KlassHandle interf;
808 check_property(
809 valid_cp_range(interface_index, cp->length()) &&
810 is_klass_reference(cp, interface_index),
811 "Interface name has bad constant pool index %u in class file %s",
812 interface_index, CHECK_(nullHandle));
813 if (cp->tag_at(interface_index).is_klass()) {
814 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
815 } else {
816 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
818 // Don't need to check legal name because it's checked when parsing constant pool.
819 // But need to make sure it's not an array type.
820 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
821 "Bad interface name in class file %s", CHECK_(nullHandle));
823 // Call resolve_super so classcircularity is checked
824 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
825 unresolved_klass, class_loader, protection_domain,
826 false, CHECK_(nullHandle));
827 interf = KlassHandle(THREAD, k);
829 if (LinkWellKnownClasses) // my super type is well known to me
830 cp->klass_at_put(interface_index, interf()); // eagerly resolve
831 }
833 if (!Klass::cast(interf())->is_interface()) {
834 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
835 }
836 interfaces->obj_at_put(index, interf());
837 }
839 if (!_need_verify || length <= 1) {
840 return interfaces;
841 }
843 // Check if there's any duplicates in interfaces
844 ResourceMark rm(THREAD);
845 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
846 THREAD, NameSigHash*, HASH_ROW_SIZE);
847 initialize_hashtable(interface_names);
848 bool dup = false;
849 {
850 debug_only(No_Safepoint_Verifier nsv;)
851 for (index = 0; index < length; index++) {
852 klassOop k = (klassOop)interfaces->obj_at(index);
853 Symbol* name = instanceKlass::cast(k)->name();
854 // If no duplicates, add (name, NULL) in hashtable interface_names.
855 if (!put_after_lookup(name, NULL, interface_names)) {
856 dup = true;
857 break;
858 }
859 }
860 }
861 if (dup) {
862 classfile_parse_error("Duplicate interface name in class file %s",
863 CHECK_(nullHandle));
864 }
866 return interfaces;
867 }
870 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
871 // Make sure the constant pool entry is of a type appropriate to this field
872 guarantee_property(
873 (constantvalue_index > 0 &&
874 constantvalue_index < cp->length()),
875 "Bad initial value index %u in ConstantValue attribute in class file %s",
876 constantvalue_index, CHECK);
877 constantTag value_type = cp->tag_at(constantvalue_index);
878 switch ( cp->basic_type_for_signature_at(signature_index) ) {
879 case T_LONG:
880 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
881 break;
882 case T_FLOAT:
883 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
884 break;
885 case T_DOUBLE:
886 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
887 break;
888 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
889 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
890 break;
891 case T_OBJECT:
892 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
893 && (value_type.is_string() || value_type.is_unresolved_string())),
894 "Bad string initial value in class file %s", CHECK);
895 break;
896 default:
897 classfile_parse_error(
898 "Unable to set initial value %u in class file %s",
899 constantvalue_index, CHECK);
900 }
901 }
904 // Parse attributes for a field.
905 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
906 u2 attributes_count,
907 bool is_static, u2 signature_index,
908 u2* constantvalue_index_addr,
909 bool* is_synthetic_addr,
910 u2* generic_signature_index_addr,
911 typeArrayHandle* field_annotations,
912 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
913 TRAPS) {
914 ClassFileStream* cfs = stream();
915 assert(attributes_count > 0, "length should be greater than 0");
916 u2 constantvalue_index = 0;
917 u2 generic_signature_index = 0;
918 bool is_synthetic = false;
919 u1* runtime_visible_annotations = NULL;
920 int runtime_visible_annotations_length = 0;
921 u1* runtime_invisible_annotations = NULL;
922 int runtime_invisible_annotations_length = 0;
923 while (attributes_count--) {
924 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
925 u2 attribute_name_index = cfs->get_u2_fast();
926 u4 attribute_length = cfs->get_u4_fast();
927 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
928 cp->tag_at(attribute_name_index).is_utf8(),
929 "Invalid field attribute index %u in class file %s",
930 attribute_name_index,
931 CHECK);
932 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
933 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
934 // ignore if non-static
935 if (constantvalue_index != 0) {
936 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
937 }
938 check_property(
939 attribute_length == 2,
940 "Invalid ConstantValue field attribute length %u in class file %s",
941 attribute_length, CHECK);
942 constantvalue_index = cfs->get_u2(CHECK);
943 if (_need_verify) {
944 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
945 }
946 } else if (attribute_name == vmSymbols::tag_synthetic()) {
947 if (attribute_length != 0) {
948 classfile_parse_error(
949 "Invalid Synthetic field attribute length %u in class file %s",
950 attribute_length, CHECK);
951 }
952 is_synthetic = true;
953 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
954 if (attribute_length != 0) {
955 classfile_parse_error(
956 "Invalid Deprecated field attribute length %u in class file %s",
957 attribute_length, CHECK);
958 }
959 } else if (_major_version >= JAVA_1_5_VERSION) {
960 if (attribute_name == vmSymbols::tag_signature()) {
961 if (attribute_length != 2) {
962 classfile_parse_error(
963 "Wrong size %u for field's Signature attribute in class file %s",
964 attribute_length, CHECK);
965 }
966 generic_signature_index = cfs->get_u2(CHECK);
967 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
968 runtime_visible_annotations_length = attribute_length;
969 runtime_visible_annotations = cfs->get_u1_buffer();
970 assert(runtime_visible_annotations != NULL, "null visible annotations");
971 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
972 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
973 runtime_invisible_annotations_length = attribute_length;
974 runtime_invisible_annotations = cfs->get_u1_buffer();
975 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
976 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
977 } else {
978 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
979 }
980 } else {
981 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
982 }
983 }
985 *constantvalue_index_addr = constantvalue_index;
986 *is_synthetic_addr = is_synthetic;
987 *generic_signature_index_addr = generic_signature_index;
988 *field_annotations = assemble_annotations(runtime_visible_annotations,
989 runtime_visible_annotations_length,
990 runtime_invisible_annotations,
991 runtime_invisible_annotations_length,
992 CHECK);
993 return;
994 }
997 // Field allocation types. Used for computing field offsets.
999 enum FieldAllocationType {
1000 STATIC_OOP, // Oops
1001 STATIC_BYTE, // Boolean, Byte, char
1002 STATIC_SHORT, // shorts
1003 STATIC_WORD, // ints
1004 STATIC_DOUBLE, // aligned long or double
1005 NONSTATIC_OOP,
1006 NONSTATIC_BYTE,
1007 NONSTATIC_SHORT,
1008 NONSTATIC_WORD,
1009 NONSTATIC_DOUBLE,
1010 MAX_FIELD_ALLOCATION_TYPE,
1011 BAD_ALLOCATION_TYPE = -1
1012 };
1014 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1015 BAD_ALLOCATION_TYPE, // 0
1016 BAD_ALLOCATION_TYPE, // 1
1017 BAD_ALLOCATION_TYPE, // 2
1018 BAD_ALLOCATION_TYPE, // 3
1019 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1020 NONSTATIC_SHORT, // T_CHAR = 5,
1021 NONSTATIC_WORD, // T_FLOAT = 6,
1022 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1023 NONSTATIC_BYTE, // T_BYTE = 8,
1024 NONSTATIC_SHORT, // T_SHORT = 9,
1025 NONSTATIC_WORD, // T_INT = 10,
1026 NONSTATIC_DOUBLE, // T_LONG = 11,
1027 NONSTATIC_OOP, // T_OBJECT = 12,
1028 NONSTATIC_OOP, // T_ARRAY = 13,
1029 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1030 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1031 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1032 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1033 BAD_ALLOCATION_TYPE, // 0
1034 BAD_ALLOCATION_TYPE, // 1
1035 BAD_ALLOCATION_TYPE, // 2
1036 BAD_ALLOCATION_TYPE, // 3
1037 STATIC_BYTE , // T_BOOLEAN = 4,
1038 STATIC_SHORT, // T_CHAR = 5,
1039 STATIC_WORD, // T_FLOAT = 6,
1040 STATIC_DOUBLE, // T_DOUBLE = 7,
1041 STATIC_BYTE, // T_BYTE = 8,
1042 STATIC_SHORT, // T_SHORT = 9,
1043 STATIC_WORD, // T_INT = 10,
1044 STATIC_DOUBLE, // T_LONG = 11,
1045 STATIC_OOP, // T_OBJECT = 12,
1046 STATIC_OOP, // T_ARRAY = 13,
1047 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1048 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1049 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1050 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1051 };
1053 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1054 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1055 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1056 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1057 return result;
1058 }
1060 class FieldAllocationCount: public ResourceObj {
1061 public:
1062 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1064 FieldAllocationCount() {
1065 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1066 count[i] = 0;
1067 }
1068 }
1070 FieldAllocationType update(bool is_static, BasicType type) {
1071 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1072 // Make sure there is no overflow with injected fields.
1073 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1074 count[atype]++;
1075 return atype;
1076 }
1077 };
1080 typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
1081 constantPoolHandle cp, bool is_interface,
1082 FieldAllocationCount *fac,
1083 objArrayHandle* fields_annotations,
1084 u2* java_fields_count_ptr, TRAPS) {
1085 ClassFileStream* cfs = stream();
1086 typeArrayHandle nullHandle;
1087 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1088 u2 length = cfs->get_u2_fast();
1089 *java_fields_count_ptr = length;
1091 int num_injected = 0;
1092 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1093 int total_fields = length + num_injected;
1095 // The field array starts with tuples of shorts
1096 // [access, name index, sig index, initial value index, byte offset].
1097 // A generic signature slot only exists for field with generic
1098 // signature attribute. And the access flag is set with
1099 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1100 // signature slots are at the end of the field array and after all
1101 // other fields data.
1102 //
1103 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1104 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1105 // ...
1106 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1107 // [generic signature index]
1108 // [generic signature index]
1109 // ...
1110 //
1111 // Allocate a temporary resource array for field data. For each field,
1112 // a slot is reserved in the temporary array for the generic signature
1113 // index. After parsing all fields, the data are copied to a permanent
1114 // array and any unused slots will be discarded.
1115 ResourceMark rm(THREAD);
1116 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1117 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1119 typeArrayHandle field_annotations;
1120 // The generic signature slots start after all other fields' data.
1121 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1122 int num_generic_signature = 0;
1123 for (int n = 0; n < length; n++) {
1124 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1126 AccessFlags access_flags;
1127 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1128 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1129 access_flags.set_flags(flags);
1131 u2 name_index = cfs->get_u2_fast();
1132 int cp_size = cp->length();
1133 check_property(
1134 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1135 "Invalid constant pool index %u for field name in class file %s",
1136 name_index, CHECK_(nullHandle));
1137 Symbol* name = cp->symbol_at(name_index);
1138 verify_legal_field_name(name, CHECK_(nullHandle));
1140 u2 signature_index = cfs->get_u2_fast();
1141 check_property(
1142 valid_cp_range(signature_index, cp_size) &&
1143 cp->tag_at(signature_index).is_utf8(),
1144 "Invalid constant pool index %u for field signature in class file %s",
1145 signature_index, CHECK_(nullHandle));
1146 Symbol* sig = cp->symbol_at(signature_index);
1147 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1149 u2 constantvalue_index = 0;
1150 bool is_synthetic = false;
1151 u2 generic_signature_index = 0;
1152 bool is_static = access_flags.is_static();
1153 FieldAnnotationCollector parsed_annotations;
1155 u2 attributes_count = cfs->get_u2_fast();
1156 if (attributes_count > 0) {
1157 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1158 &constantvalue_index, &is_synthetic,
1159 &generic_signature_index, &field_annotations,
1160 &parsed_annotations,
1161 CHECK_(nullHandle));
1162 if (field_annotations.not_null()) {
1163 if (fields_annotations->is_null()) {
1164 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1165 *fields_annotations = objArrayHandle(THREAD, md);
1166 }
1167 (*fields_annotations)->obj_at_put(n, field_annotations());
1168 }
1169 if (is_synthetic) {
1170 access_flags.set_is_synthetic();
1171 }
1172 if (generic_signature_index != 0) {
1173 access_flags.set_field_has_generic_signature();
1174 fa[generic_signature_slot] = generic_signature_index;
1175 generic_signature_slot ++;
1176 num_generic_signature ++;
1177 }
1178 }
1180 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1181 field->initialize(access_flags.as_short(),
1182 name_index,
1183 signature_index,
1184 constantvalue_index,
1185 0);
1186 if (parsed_annotations.has_any_annotations())
1187 parsed_annotations.apply_to(field);
1189 BasicType type = cp->basic_type_for_signature_at(signature_index);
1191 // Remember how many oops we encountered and compute allocation type
1192 FieldAllocationType atype = fac->update(is_static, type);
1194 // The correct offset is computed later (all oop fields will be located together)
1195 // We temporarily store the allocation type in the offset field
1196 field->set_offset(atype);
1197 }
1199 int index = length;
1200 if (num_injected != 0) {
1201 for (int n = 0; n < num_injected; n++) {
1202 // Check for duplicates
1203 if (injected[n].may_be_java) {
1204 Symbol* name = injected[n].name();
1205 Symbol* signature = injected[n].signature();
1206 bool duplicate = false;
1207 for (int i = 0; i < length; i++) {
1208 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1209 if (name == cp->symbol_at(f->name_index()) &&
1210 signature == cp->symbol_at(f->signature_index())) {
1211 // Symbol is desclared in Java so skip this one
1212 duplicate = true;
1213 break;
1214 }
1215 }
1216 if (duplicate) {
1217 // These will be removed from the field array at the end
1218 continue;
1219 }
1220 }
1222 // Injected field
1223 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1224 field->initialize(JVM_ACC_FIELD_INTERNAL,
1225 injected[n].name_index,
1226 injected[n].signature_index,
1227 0,
1228 0);
1230 BasicType type = FieldType::basic_type(injected[n].signature());
1232 // Remember how many oops we encountered and compute allocation type
1233 FieldAllocationType atype = fac->update(false, type);
1235 // The correct offset is computed later (all oop fields will be located together)
1236 // We temporarily store the allocation type in the offset field
1237 field->set_offset(atype);
1238 index++;
1239 }
1240 }
1242 // Now copy the fields' data from the temporary resource array.
1243 // Sometimes injected fields already exist in the Java source so
1244 // the fields array could be too long. In that case the
1245 // fields array is trimed. Also unused slots that were reserved
1246 // for generic signature indexes are discarded.
1247 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(
1248 index * FieldInfo::field_slots + num_generic_signature,
1249 CHECK_(nullHandle));
1250 typeArrayHandle fields(THREAD, new_fields);
1251 {
1252 int i = 0;
1253 for (; i < index * FieldInfo::field_slots; i++) {
1254 new_fields->short_at_put(i, fa[i]);
1255 }
1256 for (int j = total_fields * FieldInfo::field_slots;
1257 j < generic_signature_slot; j++) {
1258 new_fields->short_at_put(i++, fa[j]);
1259 }
1260 assert(i == new_fields->length(), "");
1261 }
1263 if (_need_verify && length > 1) {
1264 // Check duplicated fields
1265 ResourceMark rm(THREAD);
1266 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1267 THREAD, NameSigHash*, HASH_ROW_SIZE);
1268 initialize_hashtable(names_and_sigs);
1269 bool dup = false;
1270 {
1271 debug_only(No_Safepoint_Verifier nsv;)
1272 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1273 Symbol* name = fs.name();
1274 Symbol* sig = fs.signature();
1275 // If no duplicates, add name/signature in hashtable names_and_sigs.
1276 if (!put_after_lookup(name, sig, names_and_sigs)) {
1277 dup = true;
1278 break;
1279 }
1280 }
1281 }
1282 if (dup) {
1283 classfile_parse_error("Duplicate field name&signature in class file %s",
1284 CHECK_(nullHandle));
1285 }
1286 }
1288 return fields;
1289 }
1292 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1293 while (length-- > 0) {
1294 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1295 }
1296 }
1299 u2* ClassFileParser::parse_exception_table(u4 code_length,
1300 u4 exception_table_length,
1301 constantPoolHandle cp,
1302 TRAPS) {
1303 ClassFileStream* cfs = stream();
1305 u2* exception_table_start = cfs->get_u2_buffer();
1306 assert(exception_table_start != NULL, "null exception table");
1307 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1308 // Will check legal target after parsing code array in verifier.
1309 if (_need_verify) {
1310 for (unsigned int i = 0; i < exception_table_length; i++) {
1311 u2 start_pc = cfs->get_u2_fast();
1312 u2 end_pc = cfs->get_u2_fast();
1313 u2 handler_pc = cfs->get_u2_fast();
1314 u2 catch_type_index = cfs->get_u2_fast();
1315 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1316 "Illegal exception table range in class file %s",
1317 CHECK_NULL);
1318 guarantee_property(handler_pc < code_length,
1319 "Illegal exception table handler in class file %s",
1320 CHECK_NULL);
1321 if (catch_type_index != 0) {
1322 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1323 is_klass_reference(cp, catch_type_index),
1324 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1325 }
1326 }
1327 } else {
1328 cfs->skip_u2_fast(exception_table_length * 4);
1329 }
1330 return exception_table_start;
1331 }
1333 void ClassFileParser::parse_linenumber_table(
1334 u4 code_attribute_length, u4 code_length,
1335 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1336 ClassFileStream* cfs = stream();
1337 unsigned int num_entries = cfs->get_u2(CHECK);
1339 // Each entry is a u2 start_pc, and a u2 line_number
1340 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1342 // Verify line number attribute and table length
1343 check_property(
1344 code_attribute_length == sizeof(u2) + length_in_bytes,
1345 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1347 cfs->guarantee_more(length_in_bytes, CHECK);
1349 if ((*write_stream) == NULL) {
1350 if (length_in_bytes > fixed_buffer_size) {
1351 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1352 } else {
1353 (*write_stream) = new CompressedLineNumberWriteStream(
1354 linenumbertable_buffer, fixed_buffer_size);
1355 }
1356 }
1358 while (num_entries-- > 0) {
1359 u2 bci = cfs->get_u2_fast(); // start_pc
1360 u2 line = cfs->get_u2_fast(); // line_number
1361 guarantee_property(bci < code_length,
1362 "Invalid pc in LineNumberTable in class file %s", CHECK);
1363 (*write_stream)->write_pair(bci, line);
1364 }
1365 }
1368 // Class file LocalVariableTable elements.
1369 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1370 public:
1371 u2 start_bci;
1372 u2 length;
1373 u2 name_cp_index;
1374 u2 descriptor_cp_index;
1375 u2 slot;
1376 };
1379 class LVT_Hash: public CHeapObj<mtClass> {
1380 public:
1381 LocalVariableTableElement *_elem; // element
1382 LVT_Hash* _next; // Next entry in hash table
1383 };
1385 unsigned int hash(LocalVariableTableElement *elem) {
1386 unsigned int raw_hash = elem->start_bci;
1388 raw_hash = elem->length + raw_hash * 37;
1389 raw_hash = elem->name_cp_index + raw_hash * 37;
1390 raw_hash = elem->slot + raw_hash * 37;
1392 return raw_hash % HASH_ROW_SIZE;
1393 }
1395 void initialize_hashtable(LVT_Hash** table) {
1396 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1397 table[i] = NULL;
1398 }
1399 }
1401 void clear_hashtable(LVT_Hash** table) {
1402 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1403 LVT_Hash* current = table[i];
1404 LVT_Hash* next;
1405 while (current != NULL) {
1406 next = current->_next;
1407 current->_next = NULL;
1408 delete(current);
1409 current = next;
1410 }
1411 table[i] = NULL;
1412 }
1413 }
1415 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1416 LVT_Hash* entry = table[index];
1418 /*
1419 * 3-tuple start_bci/length/slot has to be unique key,
1420 * so the following comparison seems to be redundant:
1421 * && elem->name_cp_index == entry->_elem->name_cp_index
1422 */
1423 while (entry != NULL) {
1424 if (elem->start_bci == entry->_elem->start_bci
1425 && elem->length == entry->_elem->length
1426 && elem->name_cp_index == entry->_elem->name_cp_index
1427 && elem->slot == entry->_elem->slot
1428 ) {
1429 return entry;
1430 }
1431 entry = entry->_next;
1432 }
1433 return NULL;
1434 }
1436 // Return false if the local variable is found in table.
1437 // Return true if no duplicate is found.
1438 // And local variable is added as a new entry in table.
1439 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1440 // First lookup for duplicates
1441 int index = hash(elem);
1442 LVT_Hash* entry = LVT_lookup(elem, index, table);
1444 if (entry != NULL) {
1445 return false;
1446 }
1447 // No duplicate is found, allocate a new entry and fill it.
1448 if ((entry = new LVT_Hash()) == NULL) {
1449 return false;
1450 }
1451 entry->_elem = elem;
1453 // Insert into hash table
1454 entry->_next = table[index];
1455 table[index] = entry;
1457 return true;
1458 }
1460 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1461 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1462 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1463 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1464 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1465 lvt->signature_cp_index = 0;
1466 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1467 }
1469 // Function is used to parse both attributes:
1470 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1471 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1472 u2 max_locals,
1473 u4 code_attribute_length,
1474 constantPoolHandle cp,
1475 u2* localvariable_table_length,
1476 bool isLVTT,
1477 TRAPS) {
1478 ClassFileStream* cfs = stream();
1479 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1480 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1481 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1482 // Verify local variable table attribute has right length
1483 if (_need_verify) {
1484 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1485 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1486 }
1487 u2* localvariable_table_start = cfs->get_u2_buffer();
1488 assert(localvariable_table_start != NULL, "null local variable table");
1489 if (!_need_verify) {
1490 cfs->skip_u2_fast(size);
1491 } else {
1492 cfs->guarantee_more(size * 2, CHECK_NULL);
1493 for(int i = 0; i < (*localvariable_table_length); i++) {
1494 u2 start_pc = cfs->get_u2_fast();
1495 u2 length = cfs->get_u2_fast();
1496 u2 name_index = cfs->get_u2_fast();
1497 u2 descriptor_index = cfs->get_u2_fast();
1498 u2 index = cfs->get_u2_fast();
1499 // Assign to a u4 to avoid overflow
1500 u4 end_pc = (u4)start_pc + (u4)length;
1502 if (start_pc >= code_length) {
1503 classfile_parse_error(
1504 "Invalid start_pc %u in %s in class file %s",
1505 start_pc, tbl_name, CHECK_NULL);
1506 }
1507 if (end_pc > code_length) {
1508 classfile_parse_error(
1509 "Invalid length %u in %s in class file %s",
1510 length, tbl_name, CHECK_NULL);
1511 }
1512 int cp_size = cp->length();
1513 guarantee_property(
1514 valid_cp_range(name_index, cp_size) &&
1515 cp->tag_at(name_index).is_utf8(),
1516 "Name index %u in %s has bad constant type in class file %s",
1517 name_index, tbl_name, CHECK_NULL);
1518 guarantee_property(
1519 valid_cp_range(descriptor_index, cp_size) &&
1520 cp->tag_at(descriptor_index).is_utf8(),
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, constantPoolHandle cp, 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_cp_range(class_index, cp->length()) &&
1560 is_klass_reference(cp, class_index),
1561 "Bad class index %u in StackMap in class file %s",
1562 class_index, CHECK);
1563 } else if (tag == ITEM_Uninitialized) {
1564 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1565 guarantee_property(
1566 offset < code_length,
1567 "Bad uninitialized type offset %u in StackMap in class file %s",
1568 offset, CHECK);
1569 } else {
1570 guarantee_property(
1571 tag <= (u1)ITEM_Uninitialized,
1572 "Unknown variable type %u in StackMap in class file %s",
1573 tag, CHECK);
1574 }
1575 }
1576 u2_array[*u2_index] = index;
1577 *u1_index = i1;
1578 *u2_index = i2;
1579 }
1581 typeArrayOop ClassFileParser::parse_stackmap_table(
1582 u4 code_attribute_length, TRAPS) {
1583 if (code_attribute_length == 0)
1584 return NULL;
1586 ClassFileStream* cfs = stream();
1587 u1* stackmap_table_start = cfs->get_u1_buffer();
1588 assert(stackmap_table_start != NULL, "null stackmap table");
1590 // check code_attribute_length first
1591 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1593 if (!_need_verify && !DumpSharedSpaces) {
1594 return NULL;
1595 }
1597 typeArrayOop stackmap_data =
1598 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1600 stackmap_data->set_length(code_attribute_length);
1601 memcpy((void*)stackmap_data->byte_at_addr(0),
1602 (void*)stackmap_table_start, code_attribute_length);
1603 return stackmap_data;
1604 }
1606 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1607 u4 method_attribute_length,
1608 constantPoolHandle cp, TRAPS) {
1609 ClassFileStream* cfs = stream();
1610 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1611 *checked_exceptions_length = cfs->get_u2_fast();
1612 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1613 u2* checked_exceptions_start = cfs->get_u2_buffer();
1614 assert(checked_exceptions_start != NULL, "null checked exceptions");
1615 if (!_need_verify) {
1616 cfs->skip_u2_fast(size);
1617 } else {
1618 // Verify each value in the checked exception table
1619 u2 checked_exception;
1620 u2 len = *checked_exceptions_length;
1621 cfs->guarantee_more(2 * len, CHECK_NULL);
1622 for (int i = 0; i < len; i++) {
1623 checked_exception = cfs->get_u2_fast();
1624 check_property(
1625 valid_cp_range(checked_exception, cp->length()) &&
1626 is_klass_reference(cp, checked_exception),
1627 "Exception name has bad type at constant pool %u in class file %s",
1628 checked_exception, CHECK_NULL);
1629 }
1630 }
1631 // check exceptions attribute length
1632 if (_need_verify) {
1633 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1634 sizeof(u2) * size),
1635 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1636 }
1637 return checked_exceptions_start;
1638 }
1640 void ClassFileParser::throwIllegalSignature(
1641 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1642 ResourceMark rm(THREAD);
1643 Exceptions::fthrow(THREAD_AND_LOCATION,
1644 vmSymbols::java_lang_ClassFormatError(),
1645 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1646 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1647 }
1649 // Skip an annotation. Return >=limit if there is any problem.
1650 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1651 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1652 // value := switch (tag:u1) { ... }
1653 index += 2; // skip atype
1654 if ((index += 2) >= limit) return limit; // read nmem
1655 int nmem = Bytes::get_Java_u2(buffer+index-2);
1656 while (--nmem >= 0 && index < limit) {
1657 index += 2; // skip member
1658 index = skip_annotation_value(buffer, limit, index);
1659 }
1660 return index;
1661 }
1663 // Skip an annotation value. Return >=limit if there is any problem.
1664 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1665 // value := switch (tag:u1) {
1666 // case B, C, I, S, Z, D, F, J, c: con:u2;
1667 // case e: e_class:u2 e_name:u2;
1668 // case s: s_con:u2;
1669 // case [: do(nval:u2) {value};
1670 // case @: annotation;
1671 // case s: s_con:u2;
1672 // }
1673 if ((index += 1) >= limit) return limit; // read tag
1674 u1 tag = buffer[index-1];
1675 switch (tag) {
1676 case 'B': case 'C': case 'I': case 'S': case 'Z':
1677 case 'D': case 'F': case 'J': case 'c': case 's':
1678 index += 2; // skip con or s_con
1679 break;
1680 case 'e':
1681 index += 4; // skip e_class, e_name
1682 break;
1683 case '[':
1684 {
1685 if ((index += 2) >= limit) return limit; // read nval
1686 int nval = Bytes::get_Java_u2(buffer+index-2);
1687 while (--nval >= 0 && index < limit) {
1688 index = skip_annotation_value(buffer, limit, index);
1689 }
1690 }
1691 break;
1692 case '@':
1693 index = skip_annotation(buffer, limit, index);
1694 break;
1695 default:
1696 assert(false, "annotation tag");
1697 return limit; // bad tag byte
1698 }
1699 return index;
1700 }
1702 // Sift through annotations, looking for those significant to the VM:
1703 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1704 constantPoolHandle cp,
1705 ClassFileParser::AnnotationCollector* coll,
1706 TRAPS) {
1707 // annotations := do(nann:u2) {annotation}
1708 int index = 0;
1709 if ((index += 2) >= limit) return; // read nann
1710 int nann = Bytes::get_Java_u2(buffer+index-2);
1711 enum { // initial annotation layout
1712 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1713 count_off = 2, // u2 such as 1 (one value)
1714 member_off = 4, // utf8 such as 'value'
1715 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1716 e_tag_val = 'e',
1717 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1718 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1719 e_size = 11, // end of 'e' annotation
1720 c_tag_val = 'c',
1721 c_con_off = 7, // utf8 payload, such as 'I' or 'Ljava/lang/String;'
1722 c_size = 9, // end of 'c' annotation
1723 min_size = 6 // smallest possible size (zero members)
1724 };
1725 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1726 int index0 = index;
1727 index = skip_annotation(buffer, limit, index);
1728 u1* abase = buffer + index0;
1729 int atype = Bytes::get_Java_u2(abase + atype_off);
1730 int count = Bytes::get_Java_u2(abase + count_off);
1731 Symbol* aname = check_symbol_at(cp, atype);
1732 if (aname == NULL) break; // invalid annotation name
1733 Symbol* member = NULL;
1734 if (count >= 1) {
1735 int member_index = Bytes::get_Java_u2(abase + member_off);
1736 member = check_symbol_at(cp, member_index);
1737 if (member == NULL) break; // invalid member name
1738 }
1740 // Here is where parsing particular annotations will take place.
1741 AnnotationCollector::ID id = coll->annotation_index(aname);
1742 if (id == AnnotationCollector::_unknown) continue;
1743 coll->set_annotation(id);
1744 // If there are no values, just set the bit and move on:
1745 if (count == 0) continue;
1747 // For the record, here is how annotation payloads can be collected.
1748 // Suppose we want to capture @Retention.value. Here is how:
1749 //if (id == AnnotationCollector::_class_Retention) {
1750 // Symbol* payload = NULL;
1751 // if (count == 1
1752 // && e_size == (index0 - index) // match size
1753 // && e_tag_val == *(abase + tag_off)
1754 // && (check_symbol_at(cp, Bytes::get_Java_u2(abase + e_type_off))
1755 // == vmSymbols::RetentionPolicy_signature())
1756 // && member == vmSymbols::value_name()) {
1757 // payload = check_symbol_at(cp, Bytes::get_Java_u2(abase + e_con_off));
1758 // }
1759 // check_property(payload != NULL,
1760 // "Invalid @Retention annotation at offset %u in class file %s",
1761 // index0, CHECK);
1762 // if (payload != NULL) {
1763 // payload->increment_refcount();
1764 // coll->_class_RetentionPolicy = payload;
1765 // }
1766 //}
1767 }
1768 }
1770 ClassFileParser::AnnotationCollector::ID ClassFileParser::AnnotationCollector::annotation_index(Symbol* name) {
1771 vmSymbols::SID sid = vmSymbols::find_sid(name);
1772 switch (sid) {
1773 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1774 if (_location != _in_method) break; // only allow for methods
1775 return _method_ForceInline;
1776 default: break;
1777 }
1778 return AnnotationCollector::_unknown;
1779 }
1781 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1782 fatal("no field annotations yet");
1783 }
1785 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1786 if (has_annotation(_method_ForceInline))
1787 m->set_force_inline(true);
1788 }
1790 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1791 fatal("no class annotations yet");
1792 }
1795 #define MAX_ARGS_SIZE 255
1796 #define MAX_CODE_SIZE 65535
1797 #define INITIAL_MAX_LVT_NUMBER 256
1799 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1800 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1801 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1802 // entire method attribute is parsed.
1803 //
1804 // The promoted_flags parameter is used to pass relevant access_flags
1805 // from the method back up to the containing klass. These flag values
1806 // are added to klass's access_flags.
1808 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1809 AccessFlags *promoted_flags,
1810 typeArrayHandle* method_annotations,
1811 typeArrayHandle* method_parameter_annotations,
1812 typeArrayHandle* method_default_annotations,
1813 TRAPS) {
1814 ClassFileStream* cfs = stream();
1815 methodHandle nullHandle;
1816 ResourceMark rm(THREAD);
1817 // Parse fixed parts
1818 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1820 int flags = cfs->get_u2_fast();
1821 u2 name_index = cfs->get_u2_fast();
1822 int cp_size = cp->length();
1823 check_property(
1824 valid_cp_range(name_index, cp_size) &&
1825 cp->tag_at(name_index).is_utf8(),
1826 "Illegal constant pool index %u for method name in class file %s",
1827 name_index, CHECK_(nullHandle));
1828 Symbol* name = cp->symbol_at(name_index);
1829 verify_legal_method_name(name, CHECK_(nullHandle));
1831 u2 signature_index = cfs->get_u2_fast();
1832 guarantee_property(
1833 valid_cp_range(signature_index, cp_size) &&
1834 cp->tag_at(signature_index).is_utf8(),
1835 "Illegal constant pool index %u for method signature in class file %s",
1836 signature_index, CHECK_(nullHandle));
1837 Symbol* signature = cp->symbol_at(signature_index);
1839 AccessFlags access_flags;
1840 if (name == vmSymbols::class_initializer_name()) {
1841 // We ignore the other access flags for a valid class initializer.
1842 // (JVM Spec 2nd ed., chapter 4.6)
1843 if (_major_version < 51) { // backward compatibility
1844 flags = JVM_ACC_STATIC;
1845 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1846 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1847 }
1848 } else {
1849 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1850 }
1852 int args_size = -1; // only used when _need_verify is true
1853 if (_need_verify) {
1854 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1855 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1856 if (args_size > MAX_ARGS_SIZE) {
1857 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1858 }
1859 }
1861 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1863 // Default values for code and exceptions attribute elements
1864 u2 max_stack = 0;
1865 u2 max_locals = 0;
1866 u4 code_length = 0;
1867 u1* code_start = 0;
1868 u2 exception_table_length = 0;
1869 u2* exception_table_start = NULL;
1870 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1871 u2 checked_exceptions_length = 0;
1872 u2* checked_exceptions_start = NULL;
1873 CompressedLineNumberWriteStream* linenumber_table = NULL;
1874 int linenumber_table_length = 0;
1875 int total_lvt_length = 0;
1876 u2 lvt_cnt = 0;
1877 u2 lvtt_cnt = 0;
1878 bool lvt_allocated = false;
1879 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1880 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1881 u2* localvariable_table_length;
1882 u2** localvariable_table_start;
1883 u2* localvariable_type_table_length;
1884 u2** localvariable_type_table_start;
1885 bool parsed_code_attribute = false;
1886 bool parsed_checked_exceptions_attribute = false;
1887 bool parsed_stackmap_attribute = false;
1888 // stackmap attribute - JDK1.5
1889 typeArrayHandle stackmap_data;
1890 u2 generic_signature_index = 0;
1891 MethodAnnotationCollector parsed_annotations;
1892 u1* runtime_visible_annotations = NULL;
1893 int runtime_visible_annotations_length = 0;
1894 u1* runtime_invisible_annotations = NULL;
1895 int runtime_invisible_annotations_length = 0;
1896 u1* runtime_visible_parameter_annotations = NULL;
1897 int runtime_visible_parameter_annotations_length = 0;
1898 u1* runtime_invisible_parameter_annotations = NULL;
1899 int runtime_invisible_parameter_annotations_length = 0;
1900 u1* annotation_default = NULL;
1901 int annotation_default_length = 0;
1903 // Parse code and exceptions attribute
1904 u2 method_attributes_count = cfs->get_u2_fast();
1905 while (method_attributes_count--) {
1906 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1907 u2 method_attribute_name_index = cfs->get_u2_fast();
1908 u4 method_attribute_length = cfs->get_u4_fast();
1909 check_property(
1910 valid_cp_range(method_attribute_name_index, cp_size) &&
1911 cp->tag_at(method_attribute_name_index).is_utf8(),
1912 "Invalid method attribute name index %u in class file %s",
1913 method_attribute_name_index, CHECK_(nullHandle));
1915 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1916 if (method_attribute_name == vmSymbols::tag_code()) {
1917 // Parse Code attribute
1918 if (_need_verify) {
1919 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1920 "Code attribute in native or abstract methods in class file %s",
1921 CHECK_(nullHandle));
1922 }
1923 if (parsed_code_attribute) {
1924 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1925 }
1926 parsed_code_attribute = true;
1928 // Stack size, locals size, and code size
1929 if (_major_version == 45 && _minor_version <= 2) {
1930 cfs->guarantee_more(4, CHECK_(nullHandle));
1931 max_stack = cfs->get_u1_fast();
1932 max_locals = cfs->get_u1_fast();
1933 code_length = cfs->get_u2_fast();
1934 } else {
1935 cfs->guarantee_more(8, CHECK_(nullHandle));
1936 max_stack = cfs->get_u2_fast();
1937 max_locals = cfs->get_u2_fast();
1938 code_length = cfs->get_u4_fast();
1939 }
1940 if (_need_verify) {
1941 guarantee_property(args_size <= max_locals,
1942 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1943 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1944 "Invalid method Code length %u in class file %s",
1945 code_length, CHECK_(nullHandle));
1946 }
1947 // Code pointer
1948 code_start = cfs->get_u1_buffer();
1949 assert(code_start != NULL, "null code start");
1950 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1951 cfs->skip_u1_fast(code_length);
1953 // Exception handler table
1954 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1955 exception_table_length = cfs->get_u2_fast();
1956 if (exception_table_length > 0) {
1957 exception_table_start =
1958 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1959 }
1961 // Parse additional attributes in code attribute
1962 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1963 u2 code_attributes_count = cfs->get_u2_fast();
1965 unsigned int calculated_attribute_length = 0;
1967 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1968 calculated_attribute_length =
1969 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1970 } else {
1971 // max_stack, locals and length are smaller in pre-version 45.2 classes
1972 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1973 }
1974 calculated_attribute_length +=
1975 code_length +
1976 sizeof(exception_table_length) +
1977 sizeof(code_attributes_count) +
1978 exception_table_length *
1979 ( sizeof(u2) + // start_pc
1980 sizeof(u2) + // end_pc
1981 sizeof(u2) + // handler_pc
1982 sizeof(u2) ); // catch_type_index
1984 while (code_attributes_count--) {
1985 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1986 u2 code_attribute_name_index = cfs->get_u2_fast();
1987 u4 code_attribute_length = cfs->get_u4_fast();
1988 calculated_attribute_length += code_attribute_length +
1989 sizeof(code_attribute_name_index) +
1990 sizeof(code_attribute_length);
1991 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1992 cp->tag_at(code_attribute_name_index).is_utf8(),
1993 "Invalid code attribute name index %u in class file %s",
1994 code_attribute_name_index,
1995 CHECK_(nullHandle));
1996 if (LoadLineNumberTables &&
1997 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1998 // Parse and compress line number table
1999 parse_linenumber_table(code_attribute_length, code_length,
2000 &linenumber_table, CHECK_(nullHandle));
2002 } else if (LoadLocalVariableTables &&
2003 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2004 // Parse local variable table
2005 if (!lvt_allocated) {
2006 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2007 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2008 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2009 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2010 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2011 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2012 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2013 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2014 lvt_allocated = true;
2015 }
2016 if (lvt_cnt == max_lvt_cnt) {
2017 max_lvt_cnt <<= 1;
2018 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2019 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2020 }
2021 localvariable_table_start[lvt_cnt] =
2022 parse_localvariable_table(code_length,
2023 max_locals,
2024 code_attribute_length,
2025 cp,
2026 &localvariable_table_length[lvt_cnt],
2027 false, // is not LVTT
2028 CHECK_(nullHandle));
2029 total_lvt_length += localvariable_table_length[lvt_cnt];
2030 lvt_cnt++;
2031 } else if (LoadLocalVariableTypeTables &&
2032 _major_version >= JAVA_1_5_VERSION &&
2033 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2034 if (!lvt_allocated) {
2035 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2036 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2037 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2038 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2039 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2040 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2041 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2042 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2043 lvt_allocated = true;
2044 }
2045 // Parse local variable type table
2046 if (lvtt_cnt == max_lvtt_cnt) {
2047 max_lvtt_cnt <<= 1;
2048 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2049 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2050 }
2051 localvariable_type_table_start[lvtt_cnt] =
2052 parse_localvariable_table(code_length,
2053 max_locals,
2054 code_attribute_length,
2055 cp,
2056 &localvariable_type_table_length[lvtt_cnt],
2057 true, // is LVTT
2058 CHECK_(nullHandle));
2059 lvtt_cnt++;
2060 } else if (UseSplitVerifier &&
2061 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2062 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2063 // Stack map is only needed by the new verifier in JDK1.5.
2064 if (parsed_stackmap_attribute) {
2065 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2066 }
2067 typeArrayOop sm =
2068 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2069 stackmap_data = typeArrayHandle(THREAD, sm);
2070 parsed_stackmap_attribute = true;
2071 } else {
2072 // Skip unknown attributes
2073 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2074 }
2075 }
2076 // check method attribute length
2077 if (_need_verify) {
2078 guarantee_property(method_attribute_length == calculated_attribute_length,
2079 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2080 }
2081 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2082 // Parse Exceptions attribute
2083 if (parsed_checked_exceptions_attribute) {
2084 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2085 }
2086 parsed_checked_exceptions_attribute = true;
2087 checked_exceptions_start =
2088 parse_checked_exceptions(&checked_exceptions_length,
2089 method_attribute_length,
2090 cp, CHECK_(nullHandle));
2091 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2092 if (method_attribute_length != 0) {
2093 classfile_parse_error(
2094 "Invalid Synthetic method attribute length %u in class file %s",
2095 method_attribute_length, CHECK_(nullHandle));
2096 }
2097 // Should we check that there hasn't already been a synthetic attribute?
2098 access_flags.set_is_synthetic();
2099 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2100 if (method_attribute_length != 0) {
2101 classfile_parse_error(
2102 "Invalid Deprecated method attribute length %u in class file %s",
2103 method_attribute_length, CHECK_(nullHandle));
2104 }
2105 } else if (_major_version >= JAVA_1_5_VERSION) {
2106 if (method_attribute_name == vmSymbols::tag_signature()) {
2107 if (method_attribute_length != 2) {
2108 classfile_parse_error(
2109 "Invalid Signature attribute length %u in class file %s",
2110 method_attribute_length, CHECK_(nullHandle));
2111 }
2112 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2113 generic_signature_index = cfs->get_u2_fast();
2114 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2115 runtime_visible_annotations_length = method_attribute_length;
2116 runtime_visible_annotations = cfs->get_u1_buffer();
2117 assert(runtime_visible_annotations != NULL, "null visible annotations");
2118 parse_annotations(runtime_visible_annotations, runtime_visible_annotations_length, cp, &parsed_annotations, CHECK_(nullHandle));
2119 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2120 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2121 runtime_invisible_annotations_length = method_attribute_length;
2122 runtime_invisible_annotations = cfs->get_u1_buffer();
2123 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2124 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2125 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2126 runtime_visible_parameter_annotations_length = method_attribute_length;
2127 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2128 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2129 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2130 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2131 runtime_invisible_parameter_annotations_length = method_attribute_length;
2132 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2133 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2134 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2135 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2136 annotation_default_length = method_attribute_length;
2137 annotation_default = cfs->get_u1_buffer();
2138 assert(annotation_default != NULL, "null annotation default");
2139 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2140 } else {
2141 // Skip unknown attributes
2142 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2143 }
2144 } else {
2145 // Skip unknown attributes
2146 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2147 }
2148 }
2150 if (linenumber_table != NULL) {
2151 linenumber_table->write_terminator();
2152 linenumber_table_length = linenumber_table->position();
2153 }
2155 // Make sure there's at least one Code attribute in non-native/non-abstract method
2156 if (_need_verify) {
2157 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2158 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2159 }
2161 // All sizing information for a methodOop is finally available, now create it
2162 methodOop m_oop = oopFactory::new_method(code_length, access_flags,
2163 linenumber_table_length,
2164 total_lvt_length,
2165 exception_table_length,
2166 checked_exceptions_length,
2167 oopDesc::IsSafeConc,
2168 CHECK_(nullHandle));
2169 methodHandle m (THREAD, m_oop);
2171 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
2173 // Fill in information from fixed part (access_flags already set)
2174 m->set_constants(cp());
2175 m->set_name_index(name_index);
2176 m->set_signature_index(signature_index);
2177 m->set_generic_signature_index(generic_signature_index);
2178 #ifdef CC_INTERP
2179 // hmm is there a gc issue here??
2180 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2181 m->set_result_index(rtf.type());
2182 #endif
2184 if (args_size >= 0) {
2185 m->set_size_of_parameters(args_size);
2186 } else {
2187 m->compute_size_of_parameters(THREAD);
2188 }
2189 #ifdef ASSERT
2190 if (args_size >= 0) {
2191 m->compute_size_of_parameters(THREAD);
2192 assert(args_size == m->size_of_parameters(), "");
2193 }
2194 #endif
2196 // Fill in code attribute information
2197 m->set_max_stack(max_stack);
2198 m->set_max_locals(max_locals);
2200 /**
2201 * The stackmap_data field is the flag used to indicate
2202 * that the methodOop and it's associated constMethodOop are partially
2203 * initialized and thus are exempt from pre/post GC verification. Once
2204 * the field is set, the oops are considered fully initialized so make
2205 * sure that the oops can pass verification when this field is set.
2206 */
2207 m->constMethod()->set_stackmap_data(stackmap_data());
2209 // Copy byte codes
2210 m->set_code(code_start);
2212 // Copy line number table
2213 if (linenumber_table != NULL) {
2214 memcpy(m->compressed_linenumber_table(),
2215 linenumber_table->buffer(), linenumber_table_length);
2216 }
2218 // Copy exception table
2219 if (exception_table_length > 0) {
2220 int size =
2221 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2222 copy_u2_with_conversion((u2*) m->exception_table_start(),
2223 exception_table_start, size);
2224 }
2226 // Copy checked exceptions
2227 if (checked_exceptions_length > 0) {
2228 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2229 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2230 }
2232 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2233 *
2234 * Rules for LVT's and LVTT's are:
2235 * - There can be any number of LVT's and LVTT's.
2236 * - If there are n LVT's, it is the same as if there was just
2237 * one LVT containing all the entries from the n LVT's.
2238 * - There may be no more than one LVT entry per local variable.
2239 * Two LVT entries are 'equal' if these fields are the same:
2240 * start_pc, length, name, slot
2241 * - There may be no more than one LVTT entry per each LVT entry.
2242 * Each LVTT entry has to match some LVT entry.
2243 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2244 */
2245 if (total_lvt_length > 0) {
2246 int tbl_no, idx;
2248 promoted_flags->set_has_localvariable_table();
2250 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2251 initialize_hashtable(lvt_Hash);
2253 // To fill LocalVariableTable in
2254 Classfile_LVT_Element* cf_lvt;
2255 LocalVariableTableElement* lvt = m->localvariable_table_start();
2257 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2258 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2259 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2260 copy_lvt_element(&cf_lvt[idx], lvt);
2261 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2262 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2263 && _need_verify
2264 && _major_version >= JAVA_1_5_VERSION ) {
2265 clear_hashtable(lvt_Hash);
2266 classfile_parse_error("Duplicated LocalVariableTable attribute "
2267 "entry for '%s' in class file %s",
2268 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2269 CHECK_(nullHandle));
2270 }
2271 }
2272 }
2274 // To merge LocalVariableTable and LocalVariableTypeTable
2275 Classfile_LVT_Element* cf_lvtt;
2276 LocalVariableTableElement lvtt_elem;
2278 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2279 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2280 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2281 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2282 int index = hash(&lvtt_elem);
2283 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2284 if (entry == NULL) {
2285 if (_need_verify) {
2286 clear_hashtable(lvt_Hash);
2287 classfile_parse_error("LVTT entry for '%s' in class file %s "
2288 "does not match any LVT entry",
2289 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2290 CHECK_(nullHandle));
2291 }
2292 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2293 clear_hashtable(lvt_Hash);
2294 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2295 "entry for '%s' in class file %s",
2296 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2297 CHECK_(nullHandle));
2298 } else {
2299 // to add generic signatures into LocalVariableTable
2300 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2301 }
2302 }
2303 }
2304 clear_hashtable(lvt_Hash);
2305 }
2307 if (parsed_annotations.has_any_annotations())
2308 parsed_annotations.apply_to(m);
2309 *method_annotations = assemble_annotations(runtime_visible_annotations,
2310 runtime_visible_annotations_length,
2311 runtime_invisible_annotations,
2312 runtime_invisible_annotations_length,
2313 CHECK_(nullHandle));
2314 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2315 runtime_visible_parameter_annotations_length,
2316 runtime_invisible_parameter_annotations,
2317 runtime_invisible_parameter_annotations_length,
2318 CHECK_(nullHandle));
2319 *method_default_annotations = assemble_annotations(annotation_default,
2320 annotation_default_length,
2321 NULL,
2322 0,
2323 CHECK_(nullHandle));
2325 if (name == vmSymbols::finalize_method_name() &&
2326 signature == vmSymbols::void_method_signature()) {
2327 if (m->is_empty_method()) {
2328 _has_empty_finalizer = true;
2329 } else {
2330 _has_finalizer = true;
2331 }
2332 }
2333 if (name == vmSymbols::object_initializer_name() &&
2334 signature == vmSymbols::void_method_signature() &&
2335 m->is_vanilla_constructor()) {
2336 _has_vanilla_constructor = true;
2337 }
2339 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2340 m->is_method_handle_adapter())) {
2341 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2342 "Method handle invokers must be defined internally to the VM", nullHandle);
2343 }
2345 return m;
2346 }
2349 // The promoted_flags parameter is used to pass relevant access_flags
2350 // from the methods back up to the containing klass. These flag values
2351 // are added to klass's access_flags.
2353 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2354 AccessFlags* promoted_flags,
2355 bool* has_final_method,
2356 objArrayOop* methods_annotations_oop,
2357 objArrayOop* methods_parameter_annotations_oop,
2358 objArrayOop* methods_default_annotations_oop,
2359 TRAPS) {
2360 ClassFileStream* cfs = stream();
2361 objArrayHandle nullHandle;
2362 typeArrayHandle method_annotations;
2363 typeArrayHandle method_parameter_annotations;
2364 typeArrayHandle method_default_annotations;
2365 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2366 u2 length = cfs->get_u2_fast();
2367 if (length == 0) {
2368 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2369 } else {
2370 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2371 objArrayHandle methods(THREAD, m);
2372 HandleMark hm(THREAD);
2373 objArrayHandle methods_annotations;
2374 objArrayHandle methods_parameter_annotations;
2375 objArrayHandle methods_default_annotations;
2376 for (int index = 0; index < length; index++) {
2377 methodHandle method = parse_method(cp, is_interface,
2378 promoted_flags,
2379 &method_annotations,
2380 &method_parameter_annotations,
2381 &method_default_annotations,
2382 CHECK_(nullHandle));
2383 if (method->is_final()) {
2384 *has_final_method = true;
2385 }
2386 methods->obj_at_put(index, method());
2387 if (method_annotations.not_null()) {
2388 if (methods_annotations.is_null()) {
2389 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2390 methods_annotations = objArrayHandle(THREAD, md);
2391 }
2392 methods_annotations->obj_at_put(index, method_annotations());
2393 }
2394 if (method_parameter_annotations.not_null()) {
2395 if (methods_parameter_annotations.is_null()) {
2396 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2397 methods_parameter_annotations = objArrayHandle(THREAD, md);
2398 }
2399 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2400 }
2401 if (method_default_annotations.not_null()) {
2402 if (methods_default_annotations.is_null()) {
2403 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2404 methods_default_annotations = objArrayHandle(THREAD, md);
2405 }
2406 methods_default_annotations->obj_at_put(index, method_default_annotations());
2407 }
2408 }
2409 if (_need_verify && length > 1) {
2410 // Check duplicated methods
2411 ResourceMark rm(THREAD);
2412 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2413 THREAD, NameSigHash*, HASH_ROW_SIZE);
2414 initialize_hashtable(names_and_sigs);
2415 bool dup = false;
2416 {
2417 debug_only(No_Safepoint_Verifier nsv;)
2418 for (int i = 0; i < length; i++) {
2419 methodOop m = (methodOop)methods->obj_at(i);
2420 // If no duplicates, add name/signature in hashtable names_and_sigs.
2421 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2422 dup = true;
2423 break;
2424 }
2425 }
2426 }
2427 if (dup) {
2428 classfile_parse_error("Duplicate method name&signature in class file %s",
2429 CHECK_(nullHandle));
2430 }
2431 }
2433 *methods_annotations_oop = methods_annotations();
2434 *methods_parameter_annotations_oop = methods_parameter_annotations();
2435 *methods_default_annotations_oop = methods_default_annotations();
2437 return methods;
2438 }
2439 }
2442 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2443 objArrayHandle methods_annotations,
2444 objArrayHandle methods_parameter_annotations,
2445 objArrayHandle methods_default_annotations,
2446 TRAPS) {
2447 typeArrayHandle nullHandle;
2448 int length = methods()->length();
2449 // If JVMTI original method ordering or sharing is enabled we have to
2450 // remember the original class file ordering.
2451 // We temporarily use the vtable_index field in the methodOop to store the
2452 // class file index, so we can read in after calling qsort.
2453 // Put the method ordering in the shared archive.
2454 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2455 for (int index = 0; index < length; index++) {
2456 methodOop m = methodOop(methods->obj_at(index));
2457 assert(!m->valid_vtable_index(), "vtable index should not be set");
2458 m->set_vtable_index(index);
2459 }
2460 }
2461 // Sort method array by ascending method name (for faster lookups & vtable construction)
2462 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2463 methodOopDesc::sort_methods(methods(),
2464 methods_annotations(),
2465 methods_parameter_annotations(),
2466 methods_default_annotations());
2468 // If JVMTI original method ordering or sharing is enabled construct int
2469 // array remembering the original ordering
2470 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2471 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2472 typeArrayHandle method_ordering(THREAD, new_ordering);
2473 for (int index = 0; index < length; index++) {
2474 methodOop m = methodOop(methods->obj_at(index));
2475 int old_index = m->vtable_index();
2476 assert(old_index >= 0 && old_index < length, "invalid method index");
2477 method_ordering->int_at_put(index, old_index);
2478 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2479 }
2480 return method_ordering;
2481 } else {
2482 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2483 }
2484 }
2487 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, TRAPS) {
2488 ClassFileStream* cfs = stream();
2489 cfs->guarantee_more(2, CHECK); // sourcefile_index
2490 u2 sourcefile_index = cfs->get_u2_fast();
2491 check_property(
2492 valid_cp_range(sourcefile_index, cp->length()) &&
2493 cp->tag_at(sourcefile_index).is_utf8(),
2494 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2495 sourcefile_index, CHECK);
2496 set_class_sourcefile(cp->symbol_at(sourcefile_index));
2497 }
2501 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2502 int length, TRAPS) {
2503 ClassFileStream* cfs = stream();
2504 u1* sde_buffer = cfs->get_u1_buffer();
2505 assert(sde_buffer != NULL, "null sde buffer");
2507 // Don't bother storing it if there is no way to retrieve it
2508 if (JvmtiExport::can_get_source_debug_extension()) {
2509 assert((length+1) > length, "Overflow checking");
2510 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2511 for (int i = 0; i < length; i++) {
2512 sde[i] = sde_buffer[i];
2513 }
2514 sde[length] = '\0';
2515 set_class_sde_buffer((char*)sde, length);
2516 }
2517 // Got utf8 string, set stream position forward
2518 cfs->skip_u1(length, CHECK);
2519 }
2522 // Inner classes can be static, private or protected (classic VM does this)
2523 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2525 // Return number of classes in the inner classes attribute table
2526 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2527 bool parsed_enclosingmethod_attribute,
2528 u2 enclosing_method_class_index,
2529 u2 enclosing_method_method_index,
2530 constantPoolHandle cp,
2531 TRAPS) {
2532 ClassFileStream* cfs = stream();
2533 u1* current_mark = cfs->current();
2534 u2 length = 0;
2535 if (inner_classes_attribute_start != NULL) {
2536 cfs->set_current(inner_classes_attribute_start);
2537 cfs->guarantee_more(2, CHECK_0); // length
2538 length = cfs->get_u2_fast();
2539 }
2541 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2542 // method data:
2543 // [inner_class_info_index,
2544 // outer_class_info_index,
2545 // inner_name_index,
2546 // inner_class_access_flags,
2547 // ...
2548 // enclosing_method_class_index,
2549 // enclosing_method_method_index]
2550 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2551 typeArrayOop ic = oopFactory::new_permanent_shortArray(size, CHECK_0);
2552 typeArrayHandle inner_classes(THREAD, ic);
2553 int index = 0;
2554 int cp_size = cp->length();
2555 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2556 for (int n = 0; n < length; n++) {
2557 // Inner class index
2558 u2 inner_class_info_index = cfs->get_u2_fast();
2559 check_property(
2560 inner_class_info_index == 0 ||
2561 (valid_cp_range(inner_class_info_index, cp_size) &&
2562 is_klass_reference(cp, inner_class_info_index)),
2563 "inner_class_info_index %u has bad constant type in class file %s",
2564 inner_class_info_index, CHECK_0);
2565 // Outer class index
2566 u2 outer_class_info_index = cfs->get_u2_fast();
2567 check_property(
2568 outer_class_info_index == 0 ||
2569 (valid_cp_range(outer_class_info_index, cp_size) &&
2570 is_klass_reference(cp, outer_class_info_index)),
2571 "outer_class_info_index %u has bad constant type in class file %s",
2572 outer_class_info_index, CHECK_0);
2573 // Inner class name
2574 u2 inner_name_index = cfs->get_u2_fast();
2575 check_property(
2576 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2577 cp->tag_at(inner_name_index).is_utf8()),
2578 "inner_name_index %u has bad constant type in class file %s",
2579 inner_name_index, CHECK_0);
2580 if (_need_verify) {
2581 guarantee_property(inner_class_info_index != outer_class_info_index,
2582 "Class is both outer and inner class in class file %s", CHECK_0);
2583 }
2584 // Access flags
2585 AccessFlags inner_access_flags;
2586 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2587 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2588 // Set abstract bit for old class files for backward compatibility
2589 flags |= JVM_ACC_ABSTRACT;
2590 }
2591 verify_legal_class_modifiers(flags, CHECK_0);
2592 inner_access_flags.set_flags(flags);
2594 inner_classes->short_at_put(index++, inner_class_info_index);
2595 inner_classes->short_at_put(index++, outer_class_info_index);
2596 inner_classes->short_at_put(index++, inner_name_index);
2597 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2598 }
2600 // 4347400: make sure there's no duplicate entry in the classes array
2601 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2602 for(int i = 0; i < length * 4; i += 4) {
2603 for(int j = i + 4; j < length * 4; j += 4) {
2604 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2605 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2606 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2607 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2608 "Duplicate entry in InnerClasses in class file %s",
2609 CHECK_0);
2610 }
2611 }
2612 }
2614 // Set EnclosingMethod class and method indexes.
2615 if (parsed_enclosingmethod_attribute) {
2616 inner_classes->short_at_put(index++, enclosing_method_class_index);
2617 inner_classes->short_at_put(index++, enclosing_method_method_index);
2618 }
2619 assert(index == size, "wrong size");
2621 // Update instanceKlass with inner class info.
2622 set_class_inner_classes(inner_classes);
2624 // Restore buffer's current position.
2625 cfs->set_current(current_mark);
2627 return length;
2628 }
2630 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, TRAPS) {
2631 set_class_synthetic_flag(true);
2632 }
2634 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, TRAPS) {
2635 ClassFileStream* cfs = stream();
2636 u2 signature_index = cfs->get_u2(CHECK);
2637 check_property(
2638 valid_cp_range(signature_index, cp->length()) &&
2639 cp->tag_at(signature_index).is_utf8(),
2640 "Invalid constant pool index %u in Signature attribute in class file %s",
2641 signature_index, CHECK);
2642 set_class_generic_signature(cp->symbol_at(signature_index));
2643 }
2645 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp,
2646 u4 attribute_byte_length, TRAPS) {
2647 ClassFileStream* cfs = stream();
2648 u1* current_start = cfs->current();
2650 cfs->guarantee_more(2, CHECK); // length
2651 int attribute_array_length = cfs->get_u2_fast();
2653 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2654 "Short length on BootstrapMethods in class file %s",
2655 CHECK);
2657 // The attribute contains a counted array of counted tuples of shorts,
2658 // represending bootstrap specifiers:
2659 // length*{bootstrap_method_index, argument_count*{argument_index}}
2660 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2661 // operand_count = number of shorts in attr, except for leading length
2663 // The attribute is copied into a short[] array.
2664 // The array begins with a series of short[2] pairs, one for each tuple.
2665 int index_size = (attribute_array_length * 2);
2667 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2668 typeArrayHandle operands(THREAD, operands_oop);
2669 operands_oop = NULL; // tidy
2671 int operand_fill_index = index_size;
2672 int cp_size = cp->length();
2674 for (int n = 0; n < attribute_array_length; n++) {
2675 // Store a 32-bit offset into the header of the operand array.
2676 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2677 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2679 // Read a bootstrap specifier.
2680 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2681 u2 bootstrap_method_index = cfs->get_u2_fast();
2682 u2 argument_count = cfs->get_u2_fast();
2683 check_property(
2684 valid_cp_range(bootstrap_method_index, cp_size) &&
2685 cp->tag_at(bootstrap_method_index).is_method_handle(),
2686 "bootstrap_method_index %u has bad constant type in class file %s",
2687 bootstrap_method_index,
2688 CHECK);
2689 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2690 operands->short_at_put(operand_fill_index++, argument_count);
2692 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2693 for (int j = 0; j < argument_count; j++) {
2694 u2 argument_index = cfs->get_u2_fast();
2695 check_property(
2696 valid_cp_range(argument_index, cp_size) &&
2697 cp->tag_at(argument_index).is_loadable_constant(),
2698 "argument_index %u has bad constant type in class file %s",
2699 argument_index,
2700 CHECK);
2701 operands->short_at_put(operand_fill_index++, argument_index);
2702 }
2703 }
2705 assert(operand_fill_index == operands()->length(), "exact fill");
2706 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2708 u1* current_end = cfs->current();
2709 guarantee_property(current_end == current_start + attribute_byte_length,
2710 "Bad length on BootstrapMethods in class file %s",
2711 CHECK);
2713 cp->set_operands(operands());
2714 }
2717 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp,
2718 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2719 TRAPS) {
2720 ClassFileStream* cfs = stream();
2721 // Set inner classes attribute to default sentinel
2722 set_class_inner_classes(typeArrayHandle(THREAD, Universe::the_empty_short_array()));
2723 cfs->guarantee_more(2, CHECK); // attributes_count
2724 u2 attributes_count = cfs->get_u2_fast();
2725 bool parsed_sourcefile_attribute = false;
2726 bool parsed_innerclasses_attribute = false;
2727 bool parsed_enclosingmethod_attribute = false;
2728 bool parsed_bootstrap_methods_attribute = false;
2729 u1* runtime_visible_annotations = NULL;
2730 int runtime_visible_annotations_length = 0;
2731 u1* runtime_invisible_annotations = NULL;
2732 int runtime_invisible_annotations_length = 0;
2733 u1* inner_classes_attribute_start = NULL;
2734 u4 inner_classes_attribute_length = 0;
2735 u2 enclosing_method_class_index = 0;
2736 u2 enclosing_method_method_index = 0;
2737 // Iterate over attributes
2738 while (attributes_count--) {
2739 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2740 u2 attribute_name_index = cfs->get_u2_fast();
2741 u4 attribute_length = cfs->get_u4_fast();
2742 check_property(
2743 valid_cp_range(attribute_name_index, cp->length()) &&
2744 cp->tag_at(attribute_name_index).is_utf8(),
2745 "Attribute name has bad constant pool index %u in class file %s",
2746 attribute_name_index, CHECK);
2747 Symbol* tag = cp->symbol_at(attribute_name_index);
2748 if (tag == vmSymbols::tag_source_file()) {
2749 // Check for SourceFile tag
2750 if (_need_verify) {
2751 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2752 }
2753 if (parsed_sourcefile_attribute) {
2754 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2755 } else {
2756 parsed_sourcefile_attribute = true;
2757 }
2758 parse_classfile_sourcefile_attribute(cp, CHECK);
2759 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2760 // Check for SourceDebugExtension tag
2761 parse_classfile_source_debug_extension_attribute(cp, (int)attribute_length, CHECK);
2762 } else if (tag == vmSymbols::tag_inner_classes()) {
2763 // Check for InnerClasses tag
2764 if (parsed_innerclasses_attribute) {
2765 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2766 } else {
2767 parsed_innerclasses_attribute = true;
2768 }
2769 inner_classes_attribute_start = cfs->get_u1_buffer();
2770 inner_classes_attribute_length = attribute_length;
2771 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2772 } else if (tag == vmSymbols::tag_synthetic()) {
2773 // Check for Synthetic tag
2774 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2775 if (attribute_length != 0) {
2776 classfile_parse_error(
2777 "Invalid Synthetic classfile attribute length %u in class file %s",
2778 attribute_length, CHECK);
2779 }
2780 parse_classfile_synthetic_attribute(cp, CHECK);
2781 } else if (tag == vmSymbols::tag_deprecated()) {
2782 // Check for Deprecatd tag - 4276120
2783 if (attribute_length != 0) {
2784 classfile_parse_error(
2785 "Invalid Deprecated classfile attribute length %u in class file %s",
2786 attribute_length, CHECK);
2787 }
2788 } else if (_major_version >= JAVA_1_5_VERSION) {
2789 if (tag == vmSymbols::tag_signature()) {
2790 if (attribute_length != 2) {
2791 classfile_parse_error(
2792 "Wrong Signature attribute length %u in class file %s",
2793 attribute_length, CHECK);
2794 }
2795 parse_classfile_signature_attribute(cp, CHECK);
2796 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2797 runtime_visible_annotations_length = attribute_length;
2798 runtime_visible_annotations = cfs->get_u1_buffer();
2799 assert(runtime_visible_annotations != NULL, "null visible annotations");
2800 parse_annotations(runtime_visible_annotations,
2801 runtime_visible_annotations_length,
2802 cp,
2803 parsed_annotations,
2804 CHECK);
2805 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2806 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2807 runtime_invisible_annotations_length = attribute_length;
2808 runtime_invisible_annotations = cfs->get_u1_buffer();
2809 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2810 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2811 } else if (tag == vmSymbols::tag_enclosing_method()) {
2812 if (parsed_enclosingmethod_attribute) {
2813 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2814 } else {
2815 parsed_enclosingmethod_attribute = true;
2816 }
2817 cfs->guarantee_more(4, CHECK); // class_index, method_index
2818 enclosing_method_class_index = cfs->get_u2_fast();
2819 enclosing_method_method_index = cfs->get_u2_fast();
2820 if (enclosing_method_class_index == 0) {
2821 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2822 }
2823 // Validate the constant pool indices and types
2824 if (!cp->is_within_bounds(enclosing_method_class_index) ||
2825 !is_klass_reference(cp, enclosing_method_class_index)) {
2826 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2827 }
2828 if (enclosing_method_method_index != 0 &&
2829 (!cp->is_within_bounds(enclosing_method_method_index) ||
2830 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2831 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2832 }
2833 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2834 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2835 if (parsed_bootstrap_methods_attribute)
2836 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2837 parsed_bootstrap_methods_attribute = true;
2838 parse_classfile_bootstrap_methods_attribute(cp, attribute_length, CHECK);
2839 } else {
2840 // Unknown attribute
2841 cfs->skip_u1(attribute_length, CHECK);
2842 }
2843 } else {
2844 // Unknown attribute
2845 cfs->skip_u1(attribute_length, CHECK);
2846 }
2847 }
2848 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2849 runtime_visible_annotations_length,
2850 runtime_invisible_annotations,
2851 runtime_invisible_annotations_length,
2852 CHECK);
2853 set_class_annotations(annotations);
2855 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2856 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2857 inner_classes_attribute_start,
2858 parsed_innerclasses_attribute,
2859 enclosing_method_class_index,
2860 enclosing_method_method_index,
2861 cp, CHECK);
2862 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2863 guarantee_property(
2864 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2865 "Wrong InnerClasses attribute length in class file %s", CHECK);
2866 }
2867 }
2869 if (_max_bootstrap_specifier_index >= 0) {
2870 guarantee_property(parsed_bootstrap_methods_attribute,
2871 "Missing BootstrapMethods attribute in class file %s", CHECK);
2872 }
2873 }
2875 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2876 if (_synthetic_flag)
2877 k->set_is_synthetic();
2878 if (_sourcefile != NULL) {
2879 _sourcefile->increment_refcount();
2880 k->set_source_file_name(_sourcefile);
2881 }
2882 if (_generic_signature != NULL) {
2883 _generic_signature->increment_refcount();
2884 k->set_generic_signature(_generic_signature);
2885 }
2886 if (_sde_buffer != NULL) {
2887 k->set_source_debug_extension(_sde_buffer, _sde_length);
2888 }
2889 k->set_inner_classes(_inner_classes());
2890 k->set_class_annotations(_annotations());
2891 }
2893 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2894 int runtime_visible_annotations_length,
2895 u1* runtime_invisible_annotations,
2896 int runtime_invisible_annotations_length, TRAPS) {
2897 typeArrayHandle annotations;
2898 if (runtime_visible_annotations != NULL ||
2899 runtime_invisible_annotations != NULL) {
2900 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2901 runtime_invisible_annotations_length, CHECK_(annotations));
2902 annotations = typeArrayHandle(THREAD, anno);
2903 if (runtime_visible_annotations != NULL) {
2904 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2905 }
2906 if (runtime_invisible_annotations != NULL) {
2907 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2908 }
2909 }
2910 return annotations;
2911 }
2914 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2915 Handle class_loader,
2916 Handle protection_domain,
2917 KlassHandle host_klass,
2918 GrowableArray<Handle>* cp_patches,
2919 TempNewSymbol& parsed_name,
2920 bool verify,
2921 TRAPS) {
2922 // When a retransformable agent is attached, JVMTI caches the
2923 // class bytes that existed before the first retransformation.
2924 // If RedefineClasses() was used before the retransformable
2925 // agent attached, then the cached class bytes may not be the
2926 // original class bytes.
2927 unsigned char *cached_class_file_bytes = NULL;
2928 jint cached_class_file_length;
2930 ClassFileStream* cfs = stream();
2931 // Timing
2932 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2933 JavaThread* jt = (JavaThread*) THREAD;
2935 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2936 ClassLoader::perf_class_parse_selftime(),
2937 NULL,
2938 jt->get_thread_stat()->perf_recursion_counts_addr(),
2939 jt->get_thread_stat()->perf_timers_addr(),
2940 PerfClassTraceTime::PARSE_CLASS);
2942 init_parsed_class_attributes();
2944 if (JvmtiExport::should_post_class_file_load_hook()) {
2945 // Get the cached class file bytes (if any) from the class that
2946 // is being redefined or retransformed. We use jvmti_thread_state()
2947 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
2948 // a JvmtiThreadState any earlier than necessary. This will help
2949 // avoid the bug described by 7126851.
2950 JvmtiThreadState *state = jt->jvmti_thread_state();
2951 if (state != NULL) {
2952 KlassHandle *h_class_being_redefined =
2953 state->get_class_being_redefined();
2954 if (h_class_being_redefined != NULL) {
2955 instanceKlassHandle ikh_class_being_redefined =
2956 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
2957 cached_class_file_bytes =
2958 ikh_class_being_redefined->get_cached_class_file_bytes();
2959 cached_class_file_length =
2960 ikh_class_being_redefined->get_cached_class_file_len();
2961 }
2962 }
2964 unsigned char* ptr = cfs->buffer();
2965 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2967 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2968 &ptr, &end_ptr,
2969 &cached_class_file_bytes,
2970 &cached_class_file_length);
2972 if (ptr != cfs->buffer()) {
2973 // JVMTI agent has modified class file data.
2974 // Set new class file stream using JVMTI agent modified
2975 // class file data.
2976 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2977 set_stream(cfs);
2978 }
2979 }
2981 _host_klass = host_klass;
2982 _cp_patches = cp_patches;
2984 instanceKlassHandle nullHandle;
2986 // Figure out whether we can skip format checking (matching classic VM behavior)
2987 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2989 // Set the verify flag in stream
2990 cfs->set_verify(_need_verify);
2992 // Save the class file name for easier error message printing.
2993 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2995 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2996 // Magic value
2997 u4 magic = cfs->get_u4_fast();
2998 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2999 "Incompatible magic value %u in class file %s",
3000 magic, CHECK_(nullHandle));
3002 // Version numbers
3003 u2 minor_version = cfs->get_u2_fast();
3004 u2 major_version = cfs->get_u2_fast();
3006 // Check version numbers - we check this even with verifier off
3007 if (!is_supported_version(major_version, minor_version)) {
3008 if (name == NULL) {
3009 Exceptions::fthrow(
3010 THREAD_AND_LOCATION,
3011 vmSymbols::java_lang_UnsupportedClassVersionError(),
3012 "Unsupported major.minor version %u.%u",
3013 major_version,
3014 minor_version);
3015 } else {
3016 ResourceMark rm(THREAD);
3017 Exceptions::fthrow(
3018 THREAD_AND_LOCATION,
3019 vmSymbols::java_lang_UnsupportedClassVersionError(),
3020 "%s : Unsupported major.minor version %u.%u",
3021 name->as_C_string(),
3022 major_version,
3023 minor_version);
3024 }
3025 return nullHandle;
3026 }
3028 _major_version = major_version;
3029 _minor_version = minor_version;
3032 // Check if verification needs to be relaxed for this class file
3033 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3034 _relax_verify = Verifier::relax_verify_for(class_loader());
3036 // Constant pool
3037 constantPoolHandle cp = parse_constant_pool(class_loader, CHECK_(nullHandle));
3038 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
3040 int cp_size = cp->length();
3042 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3044 // Access flags
3045 AccessFlags access_flags;
3046 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3048 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3049 // Set abstract bit for old class files for backward compatibility
3050 flags |= JVM_ACC_ABSTRACT;
3051 }
3052 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3053 access_flags.set_flags(flags);
3055 // This class and superclass
3056 instanceKlassHandle super_klass;
3057 u2 this_class_index = cfs->get_u2_fast();
3058 check_property(
3059 valid_cp_range(this_class_index, cp_size) &&
3060 cp->tag_at(this_class_index).is_unresolved_klass(),
3061 "Invalid this class index %u in constant pool in class file %s",
3062 this_class_index, CHECK_(nullHandle));
3064 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3065 assert(class_name != NULL, "class_name can't be null");
3067 // It's important to set parsed_name *before* resolving the super class.
3068 // (it's used for cleanup by the caller if parsing fails)
3069 parsed_name = class_name;
3070 // parsed_name is returned and can be used if there's an error, so add to
3071 // its reference count. Caller will decrement the refcount.
3072 parsed_name->increment_refcount();
3074 // Update _class_name which could be null previously to be class_name
3075 _class_name = class_name;
3077 // Don't need to check whether this class name is legal or not.
3078 // It has been checked when constant pool is parsed.
3079 // However, make sure it is not an array type.
3080 if (_need_verify) {
3081 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3082 "Bad class name in class file %s",
3083 CHECK_(nullHandle));
3084 }
3086 klassOop preserve_this_klass; // for storing result across HandleMark
3088 // release all handles when parsing is done
3089 { HandleMark hm(THREAD);
3091 // Checks if name in class file matches requested name
3092 if (name != NULL && class_name != name) {
3093 ResourceMark rm(THREAD);
3094 Exceptions::fthrow(
3095 THREAD_AND_LOCATION,
3096 vmSymbols::java_lang_NoClassDefFoundError(),
3097 "%s (wrong name: %s)",
3098 name->as_C_string(),
3099 class_name->as_C_string()
3100 );
3101 return nullHandle;
3102 }
3104 if (TraceClassLoadingPreorder) {
3105 tty->print("[Loading %s", name->as_klass_external_name());
3106 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3107 tty->print_cr("]");
3108 }
3110 u2 super_class_index = cfs->get_u2_fast();
3111 if (super_class_index == 0) {
3112 check_property(class_name == vmSymbols::java_lang_Object(),
3113 "Invalid superclass index %u in class file %s",
3114 super_class_index,
3115 CHECK_(nullHandle));
3116 } else {
3117 check_property(valid_cp_range(super_class_index, cp_size) &&
3118 is_klass_reference(cp, super_class_index),
3119 "Invalid superclass index %u in class file %s",
3120 super_class_index,
3121 CHECK_(nullHandle));
3122 // The class name should be legal because it is checked when parsing constant pool.
3123 // However, make sure it is not an array type.
3124 bool is_array = false;
3125 if (cp->tag_at(super_class_index).is_klass()) {
3126 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3127 if (_need_verify)
3128 is_array = super_klass->oop_is_array();
3129 } else if (_need_verify) {
3130 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3131 }
3132 if (_need_verify) {
3133 guarantee_property(!is_array,
3134 "Bad superclass name in class file %s", CHECK_(nullHandle));
3135 }
3136 }
3138 // Interfaces
3139 u2 itfs_len = cfs->get_u2_fast();
3140 objArrayHandle local_interfaces;
3141 if (itfs_len == 0) {
3142 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3143 } else {
3144 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3145 }
3147 u2 java_fields_count = 0;
3148 // Fields (offsets are filled in later)
3149 FieldAllocationCount fac;
3150 objArrayHandle fields_annotations;
3151 typeArrayHandle fields = parse_fields(class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
3152 &java_fields_count,
3153 CHECK_(nullHandle));
3154 // Methods
3155 bool has_final_method = false;
3156 AccessFlags promoted_flags;
3157 promoted_flags.set_flags(0);
3158 // These need to be oop pointers because they are allocated lazily
3159 // inside parse_methods inside a nested HandleMark
3160 objArrayOop methods_annotations_oop = NULL;
3161 objArrayOop methods_parameter_annotations_oop = NULL;
3162 objArrayOop methods_default_annotations_oop = NULL;
3163 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3164 &promoted_flags,
3165 &has_final_method,
3166 &methods_annotations_oop,
3167 &methods_parameter_annotations_oop,
3168 &methods_default_annotations_oop,
3169 CHECK_(nullHandle));
3171 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3172 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3173 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3175 // Additional attributes
3176 ClassAnnotationCollector parsed_annotations;
3177 parse_classfile_attributes(cp, &parsed_annotations, CHECK_(nullHandle));
3179 // Make sure this is the end of class file stream
3180 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3182 // We check super class after class file is parsed and format is checked
3183 if (super_class_index > 0 && super_klass.is_null()) {
3184 Symbol* sk = cp->klass_name_at(super_class_index);
3185 if (access_flags.is_interface()) {
3186 // Before attempting to resolve the superclass, check for class format
3187 // errors not checked yet.
3188 guarantee_property(sk == vmSymbols::java_lang_Object(),
3189 "Interfaces must have java.lang.Object as superclass in class file %s",
3190 CHECK_(nullHandle));
3191 }
3192 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3193 sk,
3194 class_loader,
3195 protection_domain,
3196 true,
3197 CHECK_(nullHandle));
3199 KlassHandle kh (THREAD, k);
3200 super_klass = instanceKlassHandle(THREAD, kh());
3201 if (LinkWellKnownClasses) // my super class is well known to me
3202 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3203 }
3204 if (super_klass.not_null()) {
3205 if (super_klass->is_interface()) {
3206 ResourceMark rm(THREAD);
3207 Exceptions::fthrow(
3208 THREAD_AND_LOCATION,
3209 vmSymbols::java_lang_IncompatibleClassChangeError(),
3210 "class %s has interface %s as super class",
3211 class_name->as_klass_external_name(),
3212 super_klass->external_name()
3213 );
3214 return nullHandle;
3215 }
3216 // Make sure super class is not final
3217 if (super_klass->is_final()) {
3218 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3219 }
3220 }
3222 // Compute the transitive list of all unique interfaces implemented by this class
3223 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3225 // sort methods
3226 typeArrayHandle method_ordering = sort_methods(methods,
3227 methods_annotations,
3228 methods_parameter_annotations,
3229 methods_default_annotations,
3230 CHECK_(nullHandle));
3232 // promote flags from parse_methods() to the klass' flags
3233 access_flags.add_promoted_flags(promoted_flags.as_int());
3235 // Size of Java vtable (in words)
3236 int vtable_size = 0;
3237 int itable_size = 0;
3238 int num_miranda_methods = 0;
3240 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3241 num_miranda_methods,
3242 super_klass(),
3243 methods(),
3244 access_flags,
3245 class_loader,
3246 class_name,
3247 local_interfaces(),
3248 CHECK_(nullHandle));
3250 // Size of Java itable (in words)
3251 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3253 // Field size and offset computation
3254 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3255 #ifndef PRODUCT
3256 int orig_nonstatic_field_size = 0;
3257 #endif
3258 int static_field_size = 0;
3259 int next_static_oop_offset;
3260 int next_static_double_offset;
3261 int next_static_word_offset;
3262 int next_static_short_offset;
3263 int next_static_byte_offset;
3264 int next_static_type_offset;
3265 int next_nonstatic_oop_offset;
3266 int next_nonstatic_double_offset;
3267 int next_nonstatic_word_offset;
3268 int next_nonstatic_short_offset;
3269 int next_nonstatic_byte_offset;
3270 int next_nonstatic_type_offset;
3271 int first_nonstatic_oop_offset;
3272 int first_nonstatic_field_offset;
3273 int next_nonstatic_field_offset;
3275 // Calculate the starting byte offsets
3276 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3277 next_static_double_offset = next_static_oop_offset +
3278 (fac.count[STATIC_OOP] * heapOopSize);
3279 if ( fac.count[STATIC_DOUBLE] &&
3280 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3281 Universe::field_type_should_be_aligned(T_LONG)) ) {
3282 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3283 }
3285 next_static_word_offset = next_static_double_offset +
3286 (fac.count[STATIC_DOUBLE] * BytesPerLong);
3287 next_static_short_offset = next_static_word_offset +
3288 (fac.count[STATIC_WORD] * BytesPerInt);
3289 next_static_byte_offset = next_static_short_offset +
3290 (fac.count[STATIC_SHORT] * BytesPerShort);
3291 next_static_type_offset = align_size_up((next_static_byte_offset +
3292 fac.count[STATIC_BYTE] ), wordSize );
3293 static_field_size = (next_static_type_offset -
3294 next_static_oop_offset) / wordSize;
3296 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3297 nonstatic_field_size * heapOopSize;
3298 next_nonstatic_field_offset = first_nonstatic_field_offset;
3300 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE];
3301 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD];
3302 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT];
3303 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE];
3304 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP];
3306 bool super_has_nonstatic_fields =
3307 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3308 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3309 ((nonstatic_double_count + nonstatic_word_count +
3310 nonstatic_short_count + nonstatic_byte_count +
3311 nonstatic_oop_count) != 0);
3314 // Prepare list of oops for oop map generation.
3315 int* nonstatic_oop_offsets;
3316 unsigned int* nonstatic_oop_counts;
3317 unsigned int nonstatic_oop_map_count = 0;
3319 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3320 THREAD, int, nonstatic_oop_count + 1);
3321 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3322 THREAD, unsigned int, nonstatic_oop_count + 1);
3324 first_nonstatic_oop_offset = 0; // will be set for first oop field
3326 #ifndef PRODUCT
3327 if( PrintCompactFieldsSavings ) {
3328 next_nonstatic_double_offset = next_nonstatic_field_offset +
3329 (nonstatic_oop_count * heapOopSize);
3330 if ( nonstatic_double_count > 0 ) {
3331 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3332 }
3333 next_nonstatic_word_offset = next_nonstatic_double_offset +
3334 (nonstatic_double_count * BytesPerLong);
3335 next_nonstatic_short_offset = next_nonstatic_word_offset +
3336 (nonstatic_word_count * BytesPerInt);
3337 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3338 (nonstatic_short_count * BytesPerShort);
3339 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3340 nonstatic_byte_count ), heapOopSize );
3341 orig_nonstatic_field_size = nonstatic_field_size +
3342 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3343 }
3344 #endif
3345 bool compact_fields = CompactFields;
3346 int allocation_style = FieldsAllocationStyle;
3347 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3348 assert(false, "0 <= FieldsAllocationStyle <= 2");
3349 allocation_style = 1; // Optimistic
3350 }
3352 // The next classes have predefined hard-coded fields offsets
3353 // (see in JavaClasses::compute_hard_coded_offsets()).
3354 // Use default fields allocation order for them.
3355 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3356 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3357 class_name == vmSymbols::java_lang_Class() ||
3358 class_name == vmSymbols::java_lang_ClassLoader() ||
3359 class_name == vmSymbols::java_lang_ref_Reference() ||
3360 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3361 class_name == vmSymbols::java_lang_StackTraceElement() ||
3362 class_name == vmSymbols::java_lang_String() ||
3363 class_name == vmSymbols::java_lang_Throwable() ||
3364 class_name == vmSymbols::java_lang_Boolean() ||
3365 class_name == vmSymbols::java_lang_Character() ||
3366 class_name == vmSymbols::java_lang_Float() ||
3367 class_name == vmSymbols::java_lang_Double() ||
3368 class_name == vmSymbols::java_lang_Byte() ||
3369 class_name == vmSymbols::java_lang_Short() ||
3370 class_name == vmSymbols::java_lang_Integer() ||
3371 class_name == vmSymbols::java_lang_Long())) {
3372 allocation_style = 0; // Allocate oops first
3373 compact_fields = false; // Don't compact fields
3374 }
3376 if( allocation_style == 0 ) {
3377 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3378 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3379 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3380 (nonstatic_oop_count * heapOopSize);
3381 } else if( allocation_style == 1 ) {
3382 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3383 next_nonstatic_double_offset = next_nonstatic_field_offset;
3384 } else if( allocation_style == 2 ) {
3385 // Fields allocation: oops fields in super and sub classes are together.
3386 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3387 super_klass->nonstatic_oop_map_size() > 0 ) {
3388 int map_count = super_klass->nonstatic_oop_map_count();
3389 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3390 OopMapBlock* last_map = first_map + map_count - 1;
3391 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3392 if (next_offset == next_nonstatic_field_offset) {
3393 allocation_style = 0; // allocate oops first
3394 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3395 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3396 (nonstatic_oop_count * heapOopSize);
3397 }
3398 }
3399 if( allocation_style == 2 ) {
3400 allocation_style = 1; // allocate oops last
3401 next_nonstatic_double_offset = next_nonstatic_field_offset;
3402 }
3403 } else {
3404 ShouldNotReachHere();
3405 }
3407 int nonstatic_oop_space_count = 0;
3408 int nonstatic_word_space_count = 0;
3409 int nonstatic_short_space_count = 0;
3410 int nonstatic_byte_space_count = 0;
3411 int nonstatic_oop_space_offset;
3412 int nonstatic_word_space_offset;
3413 int nonstatic_short_space_offset;
3414 int nonstatic_byte_space_offset;
3416 if( nonstatic_double_count > 0 ) {
3417 int offset = next_nonstatic_double_offset;
3418 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3419 if( compact_fields && offset != next_nonstatic_double_offset ) {
3420 // Allocate available fields into the gap before double field.
3421 int length = next_nonstatic_double_offset - offset;
3422 assert(length == BytesPerInt, "");
3423 nonstatic_word_space_offset = offset;
3424 if( nonstatic_word_count > 0 ) {
3425 nonstatic_word_count -= 1;
3426 nonstatic_word_space_count = 1; // Only one will fit
3427 length -= BytesPerInt;
3428 offset += BytesPerInt;
3429 }
3430 nonstatic_short_space_offset = offset;
3431 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3432 nonstatic_short_count -= 1;
3433 nonstatic_short_space_count += 1;
3434 length -= BytesPerShort;
3435 offset += BytesPerShort;
3436 }
3437 nonstatic_byte_space_offset = offset;
3438 while( length > 0 && nonstatic_byte_count > 0 ) {
3439 nonstatic_byte_count -= 1;
3440 nonstatic_byte_space_count += 1;
3441 length -= 1;
3442 }
3443 // Allocate oop field in the gap if there are no other fields for that.
3444 nonstatic_oop_space_offset = offset;
3445 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3446 allocation_style != 0 ) { // when oop fields not first
3447 nonstatic_oop_count -= 1;
3448 nonstatic_oop_space_count = 1; // Only one will fit
3449 length -= heapOopSize;
3450 offset += heapOopSize;
3451 }
3452 }
3453 }
3455 next_nonstatic_word_offset = next_nonstatic_double_offset +
3456 (nonstatic_double_count * BytesPerLong);
3457 next_nonstatic_short_offset = next_nonstatic_word_offset +
3458 (nonstatic_word_count * BytesPerInt);
3459 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3460 (nonstatic_short_count * BytesPerShort);
3462 int notaligned_offset;
3463 if( allocation_style == 0 ) {
3464 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3465 } else { // allocation_style == 1
3466 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3467 if( nonstatic_oop_count > 0 ) {
3468 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3469 }
3470 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3471 }
3472 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3473 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3474 - first_nonstatic_field_offset)/heapOopSize);
3476 // Iterate over fields again and compute correct offsets.
3477 // The field allocation type was temporarily stored in the offset slot.
3478 // oop fields are located before non-oop fields (static and non-static).
3479 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3480 int real_offset;
3481 FieldAllocationType atype = (FieldAllocationType) fs.offset();
3482 switch (atype) {
3483 case STATIC_OOP:
3484 real_offset = next_static_oop_offset;
3485 next_static_oop_offset += heapOopSize;
3486 break;
3487 case STATIC_BYTE:
3488 real_offset = next_static_byte_offset;
3489 next_static_byte_offset += 1;
3490 break;
3491 case STATIC_SHORT:
3492 real_offset = next_static_short_offset;
3493 next_static_short_offset += BytesPerShort;
3494 break;
3495 case STATIC_WORD:
3496 real_offset = next_static_word_offset;
3497 next_static_word_offset += BytesPerInt;
3498 break;
3499 case STATIC_DOUBLE:
3500 real_offset = next_static_double_offset;
3501 next_static_double_offset += BytesPerLong;
3502 break;
3503 case NONSTATIC_OOP:
3504 if( nonstatic_oop_space_count > 0 ) {
3505 real_offset = nonstatic_oop_space_offset;
3506 nonstatic_oop_space_offset += heapOopSize;
3507 nonstatic_oop_space_count -= 1;
3508 } else {
3509 real_offset = next_nonstatic_oop_offset;
3510 next_nonstatic_oop_offset += heapOopSize;
3511 }
3512 // Update oop maps
3513 if( nonstatic_oop_map_count > 0 &&
3514 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3515 real_offset -
3516 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3517 heapOopSize ) {
3518 // Extend current oop map
3519 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3520 } else {
3521 // Create new oop map
3522 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3523 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3524 nonstatic_oop_map_count += 1;
3525 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3526 first_nonstatic_oop_offset = real_offset;
3527 }
3528 }
3529 break;
3530 case NONSTATIC_BYTE:
3531 if( nonstatic_byte_space_count > 0 ) {
3532 real_offset = nonstatic_byte_space_offset;
3533 nonstatic_byte_space_offset += 1;
3534 nonstatic_byte_space_count -= 1;
3535 } else {
3536 real_offset = next_nonstatic_byte_offset;
3537 next_nonstatic_byte_offset += 1;
3538 }
3539 break;
3540 case NONSTATIC_SHORT:
3541 if( nonstatic_short_space_count > 0 ) {
3542 real_offset = nonstatic_short_space_offset;
3543 nonstatic_short_space_offset += BytesPerShort;
3544 nonstatic_short_space_count -= 1;
3545 } else {
3546 real_offset = next_nonstatic_short_offset;
3547 next_nonstatic_short_offset += BytesPerShort;
3548 }
3549 break;
3550 case NONSTATIC_WORD:
3551 if( nonstatic_word_space_count > 0 ) {
3552 real_offset = nonstatic_word_space_offset;
3553 nonstatic_word_space_offset += BytesPerInt;
3554 nonstatic_word_space_count -= 1;
3555 } else {
3556 real_offset = next_nonstatic_word_offset;
3557 next_nonstatic_word_offset += BytesPerInt;
3558 }
3559 break;
3560 case NONSTATIC_DOUBLE:
3561 real_offset = next_nonstatic_double_offset;
3562 next_nonstatic_double_offset += BytesPerLong;
3563 break;
3564 default:
3565 ShouldNotReachHere();
3566 }
3567 fs.set_offset(real_offset);
3568 }
3570 // Size of instances
3571 int instance_size;
3573 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3574 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3576 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3578 // Number of non-static oop map blocks allocated at end of klass.
3579 const unsigned int total_oop_map_count =
3580 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3581 first_nonstatic_oop_offset);
3583 // Compute reference type
3584 ReferenceType rt;
3585 if (super_klass() == NULL) {
3586 rt = REF_NONE;
3587 } else {
3588 rt = super_klass->reference_type();
3589 }
3591 // We can now create the basic klassOop for this klass
3592 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3593 static_field_size,
3594 total_oop_map_count,
3595 access_flags,
3596 rt, host_klass,
3597 CHECK_(nullHandle));
3598 instanceKlassHandle this_klass (THREAD, ik);
3600 assert(this_klass->static_field_size() == static_field_size, "sanity");
3601 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3602 "sanity");
3604 // Fill in information already parsed
3605 this_klass->set_should_verify_class(verify);
3606 jint lh = Klass::instance_layout_helper(instance_size, false);
3607 this_klass->set_layout_helper(lh);
3608 assert(this_klass->oop_is_instance(), "layout is correct");
3609 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3610 // Not yet: supers are done below to support the new subtype-checking fields
3611 //this_klass->set_super(super_klass());
3612 this_klass->set_class_loader(class_loader());
3613 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3614 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3615 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3616 cp->set_pool_holder(this_klass());
3617 error_handler.set_in_error(false); // turn off error handler for cp
3618 this_klass->set_constants(cp());
3619 this_klass->set_local_interfaces(local_interfaces());
3620 this_klass->set_fields(fields(), java_fields_count);
3621 this_klass->set_methods(methods());
3622 if (has_final_method) {
3623 this_klass->set_has_final_method();
3624 }
3625 this_klass->set_method_ordering(method_ordering());
3626 // The instanceKlass::_methods_jmethod_ids cache and the
3627 // instanceKlass::_methods_cached_itable_indices cache are
3628 // both managed on the assumption that the initial cache
3629 // size is equal to the number of methods in the class. If
3630 // that changes, then instanceKlass::idnum_can_increment()
3631 // has to be changed accordingly.
3632 this_klass->set_initial_method_idnum(methods->length());
3633 this_klass->set_name(cp->klass_name_at(this_class_index));
3634 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3635 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3636 this_klass->set_protection_domain(protection_domain());
3637 this_klass->set_fields_annotations(fields_annotations());
3638 this_klass->set_methods_annotations(methods_annotations());
3639 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3640 this_klass->set_methods_default_annotations(methods_default_annotations());
3642 this_klass->set_minor_version(minor_version);
3643 this_klass->set_major_version(major_version);
3645 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3646 // (We used to do this lazily, but now we query it in Rewriter,
3647 // which is eagerly done for every method, so we might as well do it now,
3648 // when everything is fresh in memory.)
3649 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3650 for (int j = 0; j < methods->length(); j++) {
3651 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3652 }
3653 }
3655 if (cached_class_file_bytes != NULL) {
3656 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3657 this_klass->set_cached_class_file(cached_class_file_bytes,
3658 cached_class_file_length);
3659 }
3661 // Miranda methods
3662 if ((num_miranda_methods > 0) ||
3663 // if this class introduced new miranda methods or
3664 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3665 // super class exists and this class inherited miranda methods
3666 ) {
3667 this_klass->set_has_miranda_methods(); // then set a flag
3668 }
3670 // Fill in field values obtained by parse_classfile_attributes
3671 if (parsed_annotations.has_any_annotations())
3672 parsed_annotations.apply_to(this_klass);
3673 apply_parsed_class_attributes(this_klass);
3675 // VerifyOops believes that once this has been set, the object is completely loaded.
3676 // Compute transitive closure of interfaces this class implements
3677 this_klass->set_transitive_interfaces(transitive_interfaces());
3679 // Fill in information needed to compute superclasses.
3680 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3682 // Initialize itable offset tables
3683 klassItable::setup_itable_offset_table(this_klass);
3685 // Do final class setup
3686 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3688 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
3689 set_precomputed_flags(this_klass);
3691 // reinitialize modifiers, using the InnerClasses attribute
3692 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3693 this_klass->set_modifier_flags(computed_modifiers);
3695 // check if this class can access its super class
3696 check_super_class_access(this_klass, CHECK_(nullHandle));
3698 // check if this class can access its superinterfaces
3699 check_super_interface_access(this_klass, CHECK_(nullHandle));
3701 // check if this class overrides any final method
3702 check_final_method_override(this_klass, CHECK_(nullHandle));
3704 // check that if this class is an interface then it doesn't have static methods
3705 if (this_klass->is_interface()) {
3706 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3707 }
3709 // Allocate mirror and initialize static fields
3710 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3712 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3713 false /* not shared class */);
3715 if (TraceClassLoading) {
3716 // print in a single call to reduce interleaving of output
3717 if (cfs->source() != NULL) {
3718 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3719 cfs->source());
3720 } else if (class_loader.is_null()) {
3721 if (THREAD->is_Java_thread()) {
3722 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3723 tty->print("[Loaded %s by instance of %s]\n",
3724 this_klass->external_name(),
3725 instanceKlass::cast(caller)->external_name());
3726 } else {
3727 tty->print("[Loaded %s]\n", this_klass->external_name());
3728 }
3729 } else {
3730 ResourceMark rm;
3731 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3732 instanceKlass::cast(class_loader->klass())->external_name());
3733 }
3734 }
3736 if (TraceClassResolution) {
3737 // print out the superclass.
3738 const char * from = Klass::cast(this_klass())->external_name();
3739 if (this_klass->java_super() != NULL) {
3740 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3741 }
3742 // print out each of the interface classes referred to by this class.
3743 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3744 if (!local_interfaces.is_null()) {
3745 int length = local_interfaces->length();
3746 for (int i = 0; i < length; i++) {
3747 klassOop k = klassOop(local_interfaces->obj_at(i));
3748 instanceKlass* to_class = instanceKlass::cast(k);
3749 const char * to = to_class->external_name();
3750 tty->print("RESOLVE %s %s (interface)\n", from, to);
3751 }
3752 }
3753 }
3755 #ifndef PRODUCT
3756 if( PrintCompactFieldsSavings ) {
3757 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3758 tty->print("[Saved %d of %d bytes in %s]\n",
3759 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3760 orig_nonstatic_field_size*heapOopSize,
3761 this_klass->external_name());
3762 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3763 tty->print("[Wasted %d over %d bytes in %s]\n",
3764 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3765 orig_nonstatic_field_size*heapOopSize,
3766 this_klass->external_name());
3767 }
3768 }
3769 #endif
3771 // preserve result across HandleMark
3772 preserve_this_klass = this_klass();
3773 }
3775 // Create new handle outside HandleMark
3776 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3777 debug_only(this_klass->as_klassOop()->verify();)
3779 return this_klass;
3780 }
3783 unsigned int
3784 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3785 unsigned int nonstatic_oop_map_count,
3786 int first_nonstatic_oop_offset) {
3787 unsigned int map_count =
3788 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3789 if (nonstatic_oop_map_count > 0) {
3790 // We have oops to add to map
3791 if (map_count == 0) {
3792 map_count = nonstatic_oop_map_count;
3793 } else {
3794 // Check whether we should add a new map block or whether the last one can
3795 // be extended
3796 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3797 OopMapBlock* const last_map = first_map + map_count - 1;
3799 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3800 if (next_offset == first_nonstatic_oop_offset) {
3801 // There is no gap bettwen superklass's last oop field and first
3802 // local oop field, merge maps.
3803 nonstatic_oop_map_count -= 1;
3804 } else {
3805 // Superklass didn't end with a oop field, add extra maps
3806 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3807 }
3808 map_count += nonstatic_oop_map_count;
3809 }
3810 }
3811 return map_count;
3812 }
3815 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3816 unsigned int nonstatic_oop_map_count,
3817 int* nonstatic_oop_offsets,
3818 unsigned int* nonstatic_oop_counts) {
3819 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3820 const instanceKlass* const super = k->superklass();
3821 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3822 if (super_count > 0) {
3823 // Copy maps from superklass
3824 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3825 for (unsigned int i = 0; i < super_count; ++i) {
3826 *this_oop_map++ = *super_oop_map++;
3827 }
3828 }
3830 if (nonstatic_oop_map_count > 0) {
3831 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3832 // The counts differ because there is no gap between superklass's last oop
3833 // field and the first local oop field. Extend the last oop map copied
3834 // from the superklass instead of creating new one.
3835 nonstatic_oop_map_count--;
3836 nonstatic_oop_offsets++;
3837 this_oop_map--;
3838 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3839 this_oop_map++;
3840 }
3842 // Add new map blocks, fill them
3843 while (nonstatic_oop_map_count-- > 0) {
3844 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3845 this_oop_map->set_count(*nonstatic_oop_counts++);
3846 this_oop_map++;
3847 }
3848 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3849 this_oop_map, "sanity");
3850 }
3851 }
3854 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3855 klassOop super = k->super();
3857 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3858 // in which case we don't have to register objects as finalizable
3859 if (!_has_empty_finalizer) {
3860 if (_has_finalizer ||
3861 (super != NULL && super->klass_part()->has_finalizer())) {
3862 k->set_has_finalizer();
3863 }
3864 }
3866 #ifdef ASSERT
3867 bool f = false;
3868 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3869 vmSymbols::void_method_signature());
3870 if (m != NULL && !m->is_empty_method()) {
3871 f = true;
3872 }
3873 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3874 #endif
3876 // Check if this klass supports the java.lang.Cloneable interface
3877 if (SystemDictionary::Cloneable_klass_loaded()) {
3878 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3879 k->set_is_cloneable();
3880 }
3881 }
3883 // Check if this klass has a vanilla default constructor
3884 if (super == NULL) {
3885 // java.lang.Object has empty default constructor
3886 k->set_has_vanilla_constructor();
3887 } else {
3888 if (Klass::cast(super)->has_vanilla_constructor() &&
3889 _has_vanilla_constructor) {
3890 k->set_has_vanilla_constructor();
3891 }
3892 #ifdef ASSERT
3893 bool v = false;
3894 if (Klass::cast(super)->has_vanilla_constructor()) {
3895 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3896 ), vmSymbols::void_method_signature());
3897 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3898 v = true;
3899 }
3900 }
3901 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3902 #endif
3903 }
3905 // If it cannot be fast-path allocated, set a bit in the layout helper.
3906 // See documentation of instanceKlass::can_be_fastpath_allocated().
3907 assert(k->size_helper() > 0, "layout_helper is initialized");
3908 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3909 || k->is_abstract() || k->is_interface()
3910 || (k->name() == vmSymbols::java_lang_Class()
3911 && k->class_loader() == NULL)
3912 || k->size_helper() >= FastAllocateSizeLimit) {
3913 // Forbid fast-path allocation.
3914 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3915 k->set_layout_helper(lh);
3916 }
3917 }
3920 // utility method for appending and array with check for duplicates
3922 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3923 // iterate over new interfaces
3924 for (int i = 0; i < ifs->length(); i++) {
3925 oop e = ifs->obj_at(i);
3926 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3927 // check for duplicates
3928 bool duplicate = false;
3929 for (int j = 0; j < index; j++) {
3930 if (result->obj_at(j) == e) {
3931 duplicate = true;
3932 break;
3933 }
3934 }
3935 // add new interface
3936 if (!duplicate) {
3937 result->obj_at_put(index++, e);
3938 }
3939 }
3940 }
3942 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3943 // Compute maximum size for transitive interfaces
3944 int max_transitive_size = 0;
3945 int super_size = 0;
3946 // Add superclass transitive interfaces size
3947 if (super.not_null()) {
3948 super_size = super->transitive_interfaces()->length();
3949 max_transitive_size += super_size;
3950 }
3951 // Add local interfaces' super interfaces
3952 int local_size = local_ifs->length();
3953 for (int i = 0; i < local_size; i++) {
3954 klassOop l = klassOop(local_ifs->obj_at(i));
3955 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3956 }
3957 // Finally add local interfaces
3958 max_transitive_size += local_size;
3959 // Construct array
3960 objArrayHandle result;
3961 if (max_transitive_size == 0) {
3962 // no interfaces, use canonicalized array
3963 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3964 } else if (max_transitive_size == super_size) {
3965 // no new local interfaces added, share superklass' transitive interface array
3966 result = objArrayHandle(THREAD, super->transitive_interfaces());
3967 } else if (max_transitive_size == local_size) {
3968 // only local interfaces added, share local interface array
3969 result = local_ifs;
3970 } else {
3971 objArrayHandle nullHandle;
3972 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3973 result = objArrayHandle(THREAD, new_objarray);
3974 int index = 0;
3975 // Copy down from superclass
3976 if (super.not_null()) {
3977 append_interfaces(result, index, super->transitive_interfaces());
3978 }
3979 // Copy down from local interfaces' superinterfaces
3980 for (int i = 0; i < local_ifs->length(); i++) {
3981 klassOop l = klassOop(local_ifs->obj_at(i));
3982 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3983 }
3984 // Finally add local interfaces
3985 append_interfaces(result, index, local_ifs());
3987 // Check if duplicates were removed
3988 if (index != max_transitive_size) {
3989 assert(index < max_transitive_size, "just checking");
3990 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3991 for (int i = 0; i < index; i++) {
3992 oop e = result->obj_at(i);
3993 assert(e != NULL, "just checking");
3994 new_result->obj_at_put(i, e);
3995 }
3996 result = objArrayHandle(THREAD, new_result);
3997 }
3998 }
3999 return result;
4000 }
4003 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4004 klassOop super = this_klass->super();
4005 if ((super != NULL) &&
4006 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
4007 ResourceMark rm(THREAD);
4008 Exceptions::fthrow(
4009 THREAD_AND_LOCATION,
4010 vmSymbols::java_lang_IllegalAccessError(),
4011 "class %s cannot access its superclass %s",
4012 this_klass->external_name(),
4013 instanceKlass::cast(super)->external_name()
4014 );
4015 return;
4016 }
4017 }
4020 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4021 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
4022 int lng = local_interfaces->length();
4023 for (int i = lng - 1; i >= 0; i--) {
4024 klassOop k = klassOop(local_interfaces->obj_at(i));
4025 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
4026 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
4027 ResourceMark rm(THREAD);
4028 Exceptions::fthrow(
4029 THREAD_AND_LOCATION,
4030 vmSymbols::java_lang_IllegalAccessError(),
4031 "class %s cannot access its superinterface %s",
4032 this_klass->external_name(),
4033 instanceKlass::cast(k)->external_name()
4034 );
4035 return;
4036 }
4037 }
4038 }
4041 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4042 objArrayHandle methods (THREAD, this_klass->methods());
4043 int num_methods = methods->length();
4045 // go thru each method and check if it overrides a final method
4046 for (int index = 0; index < num_methods; index++) {
4047 methodOop m = (methodOop)methods->obj_at(index);
4049 // skip private, static and <init> methods
4050 if ((!m->is_private()) &&
4051 (!m->is_static()) &&
4052 (m->name() != vmSymbols::object_initializer_name())) {
4054 Symbol* name = m->name();
4055 Symbol* signature = m->signature();
4056 klassOop k = this_klass->super();
4057 methodOop super_m = NULL;
4058 while (k != NULL) {
4059 // skip supers that don't have final methods.
4060 if (k->klass_part()->has_final_method()) {
4061 // lookup a matching method in the super class hierarchy
4062 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
4063 if (super_m == NULL) {
4064 break; // didn't find any match; get out
4065 }
4067 if (super_m->is_final() &&
4068 // matching method in super is final
4069 (Reflection::verify_field_access(this_klass->as_klassOop(),
4070 super_m->method_holder(),
4071 super_m->method_holder(),
4072 super_m->access_flags(), false))
4073 // this class can access super final method and therefore override
4074 ) {
4075 ResourceMark rm(THREAD);
4076 Exceptions::fthrow(
4077 THREAD_AND_LOCATION,
4078 vmSymbols::java_lang_VerifyError(),
4079 "class %s overrides final method %s.%s",
4080 this_klass->external_name(),
4081 name->as_C_string(),
4082 signature->as_C_string()
4083 );
4084 return;
4085 }
4087 // continue to look from super_m's holder's super.
4088 k = instanceKlass::cast(super_m->method_holder())->super();
4089 continue;
4090 }
4092 k = k->klass_part()->super();
4093 }
4094 }
4095 }
4096 }
4099 // assumes that this_klass is an interface
4100 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4101 assert(this_klass->is_interface(), "not an interface");
4102 objArrayHandle methods (THREAD, this_klass->methods());
4103 int num_methods = methods->length();
4105 for (int index = 0; index < num_methods; index++) {
4106 methodOop m = (methodOop)methods->obj_at(index);
4107 // if m is static and not the init method, throw a verify error
4108 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4109 ResourceMark rm(THREAD);
4110 Exceptions::fthrow(
4111 THREAD_AND_LOCATION,
4112 vmSymbols::java_lang_VerifyError(),
4113 "Illegal static method %s in interface %s",
4114 m->name()->as_C_string(),
4115 this_klass->external_name()
4116 );
4117 return;
4118 }
4119 }
4120 }
4122 // utility methods for format checking
4124 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4125 if (!_need_verify) { return; }
4127 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4128 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4129 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4130 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4131 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4132 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4133 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4135 if ((is_abstract && is_final) ||
4136 (is_interface && !is_abstract) ||
4137 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4138 (!is_interface && major_gte_15 && is_annotation)) {
4139 ResourceMark rm(THREAD);
4140 Exceptions::fthrow(
4141 THREAD_AND_LOCATION,
4142 vmSymbols::java_lang_ClassFormatError(),
4143 "Illegal class modifiers in class %s: 0x%X",
4144 _class_name->as_C_string(), flags
4145 );
4146 return;
4147 }
4148 }
4150 bool ClassFileParser::has_illegal_visibility(jint flags) {
4151 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4152 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4153 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4155 return ((is_public && is_protected) ||
4156 (is_public && is_private) ||
4157 (is_protected && is_private));
4158 }
4160 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4161 u2 max_version =
4162 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4163 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4164 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4165 (major <= max_version) &&
4166 ((major != max_version) ||
4167 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4168 }
4170 void ClassFileParser::verify_legal_field_modifiers(
4171 jint flags, bool is_interface, TRAPS) {
4172 if (!_need_verify) { return; }
4174 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4175 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4176 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4177 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4178 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4179 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4180 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4181 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4182 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4184 bool is_illegal = false;
4186 if (is_interface) {
4187 if (!is_public || !is_static || !is_final || is_private ||
4188 is_protected || is_volatile || is_transient ||
4189 (major_gte_15 && is_enum)) {
4190 is_illegal = true;
4191 }
4192 } else { // not interface
4193 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4194 is_illegal = true;
4195 }
4196 }
4198 if (is_illegal) {
4199 ResourceMark rm(THREAD);
4200 Exceptions::fthrow(
4201 THREAD_AND_LOCATION,
4202 vmSymbols::java_lang_ClassFormatError(),
4203 "Illegal field modifiers in class %s: 0x%X",
4204 _class_name->as_C_string(), flags);
4205 return;
4206 }
4207 }
4209 void ClassFileParser::verify_legal_method_modifiers(
4210 jint flags, bool is_interface, Symbol* name, TRAPS) {
4211 if (!_need_verify) { return; }
4213 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4214 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4215 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4216 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4217 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4218 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4219 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4220 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4221 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4222 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4223 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4225 bool is_illegal = false;
4227 if (is_interface) {
4228 if (!is_abstract || !is_public || is_static || is_final ||
4229 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4230 is_illegal = true;
4231 }
4232 } else { // not interface
4233 if (is_initializer) {
4234 if (is_static || is_final || is_synchronized || is_native ||
4235 is_abstract || (major_gte_15 && is_bridge)) {
4236 is_illegal = true;
4237 }
4238 } else { // not initializer
4239 if (is_abstract) {
4240 if ((is_final || is_native || is_private || is_static ||
4241 (major_gte_15 && (is_synchronized || is_strict)))) {
4242 is_illegal = true;
4243 }
4244 }
4245 if (has_illegal_visibility(flags)) {
4246 is_illegal = true;
4247 }
4248 }
4249 }
4251 if (is_illegal) {
4252 ResourceMark rm(THREAD);
4253 Exceptions::fthrow(
4254 THREAD_AND_LOCATION,
4255 vmSymbols::java_lang_ClassFormatError(),
4256 "Method %s in class %s has illegal modifiers: 0x%X",
4257 name->as_C_string(), _class_name->as_C_string(), flags);
4258 return;
4259 }
4260 }
4262 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4263 assert(_need_verify, "only called when _need_verify is true");
4264 int i = 0;
4265 int count = length >> 2;
4266 for (int k=0; k<count; k++) {
4267 unsigned char b0 = buffer[i];
4268 unsigned char b1 = buffer[i+1];
4269 unsigned char b2 = buffer[i+2];
4270 unsigned char b3 = buffer[i+3];
4271 // For an unsigned char v,
4272 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4273 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4274 unsigned char res = b0 | b0 - 1 |
4275 b1 | b1 - 1 |
4276 b2 | b2 - 1 |
4277 b3 | b3 - 1;
4278 if (res >= 128) break;
4279 i += 4;
4280 }
4281 for(; i < length; i++) {
4282 unsigned short c;
4283 // no embedded zeros
4284 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4285 if(buffer[i] < 128) {
4286 continue;
4287 }
4288 if ((i + 5) < length) { // see if it's legal supplementary character
4289 if (UTF8::is_supplementary_character(&buffer[i])) {
4290 c = UTF8::get_supplementary_character(&buffer[i]);
4291 i += 5;
4292 continue;
4293 }
4294 }
4295 switch (buffer[i] >> 4) {
4296 default: break;
4297 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4298 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4299 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4300 c = (buffer[i] & 0x1F) << 6;
4301 i++;
4302 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4303 c += buffer[i] & 0x3F;
4304 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4305 // for classes with major > 47, c must a null or a character in its shortest form
4306 break;
4307 }
4308 }
4309 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4310 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4311 c = (buffer[i] & 0xF) << 12;
4312 i += 2;
4313 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4314 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4315 if (_major_version <= 47 || c >= 0x800) {
4316 // for classes with major > 47, c must be in its shortest form
4317 break;
4318 }
4319 }
4320 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4321 } // end of switch
4322 } // end of for
4323 }
4325 // Checks if name is a legal class name.
4326 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4327 if (!_need_verify || _relax_verify) { return; }
4329 char buf[fixed_buffer_size];
4330 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4331 unsigned int length = name->utf8_length();
4332 bool legal = false;
4334 if (length > 0) {
4335 char* p;
4336 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4337 p = skip_over_field_signature(bytes, false, length, CHECK);
4338 legal = (p != NULL) && ((p - bytes) == (int)length);
4339 } else if (_major_version < JAVA_1_5_VERSION) {
4340 if (bytes[0] != '<') {
4341 p = skip_over_field_name(bytes, true, length);
4342 legal = (p != NULL) && ((p - bytes) == (int)length);
4343 }
4344 } else {
4345 // 4900761: relax the constraints based on JSR202 spec
4346 // Class names may be drawn from the entire Unicode character set.
4347 // Identifiers between '/' must be unqualified names.
4348 // The utf8 string has been verified when parsing cpool entries.
4349 legal = verify_unqualified_name(bytes, length, LegalClass);
4350 }
4351 }
4352 if (!legal) {
4353 ResourceMark rm(THREAD);
4354 Exceptions::fthrow(
4355 THREAD_AND_LOCATION,
4356 vmSymbols::java_lang_ClassFormatError(),
4357 "Illegal class name \"%s\" in class file %s", bytes,
4358 _class_name->as_C_string()
4359 );
4360 return;
4361 }
4362 }
4364 // Checks if name is a legal field name.
4365 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4366 if (!_need_verify || _relax_verify) { return; }
4368 char buf[fixed_buffer_size];
4369 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4370 unsigned int length = name->utf8_length();
4371 bool legal = false;
4373 if (length > 0) {
4374 if (_major_version < JAVA_1_5_VERSION) {
4375 if (bytes[0] != '<') {
4376 char* p = skip_over_field_name(bytes, false, length);
4377 legal = (p != NULL) && ((p - bytes) == (int)length);
4378 }
4379 } else {
4380 // 4881221: relax the constraints based on JSR202 spec
4381 legal = verify_unqualified_name(bytes, length, LegalField);
4382 }
4383 }
4385 if (!legal) {
4386 ResourceMark rm(THREAD);
4387 Exceptions::fthrow(
4388 THREAD_AND_LOCATION,
4389 vmSymbols::java_lang_ClassFormatError(),
4390 "Illegal field name \"%s\" in class %s", bytes,
4391 _class_name->as_C_string()
4392 );
4393 return;
4394 }
4395 }
4397 // Checks if name is a legal method name.
4398 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4399 if (!_need_verify || _relax_verify) { return; }
4401 assert(name != NULL, "method name is null");
4402 char buf[fixed_buffer_size];
4403 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4404 unsigned int length = name->utf8_length();
4405 bool legal = false;
4407 if (length > 0) {
4408 if (bytes[0] == '<') {
4409 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4410 legal = true;
4411 }
4412 } else if (_major_version < JAVA_1_5_VERSION) {
4413 char* p;
4414 p = skip_over_field_name(bytes, false, length);
4415 legal = (p != NULL) && ((p - bytes) == (int)length);
4416 } else {
4417 // 4881221: relax the constraints based on JSR202 spec
4418 legal = verify_unqualified_name(bytes, length, LegalMethod);
4419 }
4420 }
4422 if (!legal) {
4423 ResourceMark rm(THREAD);
4424 Exceptions::fthrow(
4425 THREAD_AND_LOCATION,
4426 vmSymbols::java_lang_ClassFormatError(),
4427 "Illegal method name \"%s\" in class %s", bytes,
4428 _class_name->as_C_string()
4429 );
4430 return;
4431 }
4432 }
4435 // Checks if signature is a legal field signature.
4436 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4437 if (!_need_verify) { return; }
4439 char buf[fixed_buffer_size];
4440 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4441 unsigned int length = signature->utf8_length();
4442 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4444 if (p == NULL || (p - bytes) != (int)length) {
4445 throwIllegalSignature("Field", name, signature, CHECK);
4446 }
4447 }
4449 // Checks if signature is a legal method signature.
4450 // Returns number of parameters
4451 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4452 if (!_need_verify) {
4453 // make sure caller's args_size will be less than 0 even for non-static
4454 // method so it will be recomputed in compute_size_of_parameters().
4455 return -2;
4456 }
4458 unsigned int args_size = 0;
4459 char buf[fixed_buffer_size];
4460 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4461 unsigned int length = signature->utf8_length();
4462 char* nextp;
4464 // The first character must be a '('
4465 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4466 length--;
4467 // Skip over legal field signatures
4468 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4469 while ((length > 0) && (nextp != NULL)) {
4470 args_size++;
4471 if (p[0] == 'J' || p[0] == 'D') {
4472 args_size++;
4473 }
4474 length -= nextp - p;
4475 p = nextp;
4476 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4477 }
4478 // The first non-signature thing better be a ')'
4479 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4480 length--;
4481 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4482 // All internal methods must return void
4483 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4484 return args_size;
4485 }
4486 } else {
4487 // Now we better just have a return value
4488 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4489 if (nextp && ((int)length == (nextp - p))) {
4490 return args_size;
4491 }
4492 }
4493 }
4494 }
4495 // Report error
4496 throwIllegalSignature("Method", name, signature, CHECK_0);
4497 return 0;
4498 }
4501 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4502 // Method names also may not contain the characters '<' or '>', unless <init>
4503 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4504 // method. Because these names have been checked as special cases before
4505 // calling this method in verify_legal_method_name.
4506 bool ClassFileParser::verify_unqualified_name(
4507 char* name, unsigned int length, int type) {
4508 jchar ch;
4510 for (char* p = name; p != name + length; ) {
4511 ch = *p;
4512 if (ch < 128) {
4513 p++;
4514 if (ch == '.' || ch == ';' || ch == '[' ) {
4515 return false; // do not permit '.', ';', or '['
4516 }
4517 if (type != LegalClass && ch == '/') {
4518 return false; // do not permit '/' unless it's class name
4519 }
4520 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4521 return false; // do not permit '<' or '>' in method names
4522 }
4523 } else {
4524 char* tmp_p = UTF8::next(p, &ch);
4525 p = tmp_p;
4526 }
4527 }
4528 return true;
4529 }
4532 // Take pointer to a string. Skip over the longest part of the string that could
4533 // be taken as a fieldname. Allow '/' if slash_ok is true.
4534 // Return a pointer to just past the fieldname.
4535 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4536 // being true, we saw consecutive slashes (meaning we were looking for a
4537 // qualified path but found something that was badly-formed).
4538 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4539 char* p;
4540 jchar ch;
4541 jboolean last_is_slash = false;
4542 jboolean not_first_ch = false;
4544 for (p = name; p != name + length; not_first_ch = true) {
4545 char* old_p = p;
4546 ch = *p;
4547 if (ch < 128) {
4548 p++;
4549 // quick check for ascii
4550 if ((ch >= 'a' && ch <= 'z') ||
4551 (ch >= 'A' && ch <= 'Z') ||
4552 (ch == '_' || ch == '$') ||
4553 (not_first_ch && ch >= '0' && ch <= '9')) {
4554 last_is_slash = false;
4555 continue;
4556 }
4557 if (slash_ok && ch == '/') {
4558 if (last_is_slash) {
4559 return NULL; // Don't permit consecutive slashes
4560 }
4561 last_is_slash = true;
4562 continue;
4563 }
4564 } else {
4565 jint unicode_ch;
4566 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4567 p = tmp_p;
4568 last_is_slash = false;
4569 // Check if ch is Java identifier start or is Java identifier part
4570 // 4672820: call java.lang.Character methods directly without generating separate tables.
4571 EXCEPTION_MARK;
4572 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4574 // return value
4575 JavaValue result(T_BOOLEAN);
4576 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4577 JavaCallArguments args;
4578 args.push_int(unicode_ch);
4580 // public static boolean isJavaIdentifierStart(char ch);
4581 JavaCalls::call_static(&result,
4582 klass,
4583 vmSymbols::isJavaIdentifierStart_name(),
4584 vmSymbols::int_bool_signature(),
4585 &args,
4586 THREAD);
4588 if (HAS_PENDING_EXCEPTION) {
4589 CLEAR_PENDING_EXCEPTION;
4590 return 0;
4591 }
4592 if (result.get_jboolean()) {
4593 continue;
4594 }
4596 if (not_first_ch) {
4597 // public static boolean isJavaIdentifierPart(char ch);
4598 JavaCalls::call_static(&result,
4599 klass,
4600 vmSymbols::isJavaIdentifierPart_name(),
4601 vmSymbols::int_bool_signature(),
4602 &args,
4603 THREAD);
4605 if (HAS_PENDING_EXCEPTION) {
4606 CLEAR_PENDING_EXCEPTION;
4607 return 0;
4608 }
4610 if (result.get_jboolean()) {
4611 continue;
4612 }
4613 }
4614 }
4615 return (not_first_ch) ? old_p : NULL;
4616 }
4617 return (not_first_ch) ? p : NULL;
4618 }
4621 // Take pointer to a string. Skip over the longest part of the string that could
4622 // be taken as a field signature. Allow "void" if void_ok.
4623 // Return a pointer to just past the signature.
4624 // Return NULL if no legal signature is found.
4625 char* ClassFileParser::skip_over_field_signature(char* signature,
4626 bool void_ok,
4627 unsigned int length,
4628 TRAPS) {
4629 unsigned int array_dim = 0;
4630 while (length > 0) {
4631 switch (signature[0]) {
4632 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4633 case JVM_SIGNATURE_BOOLEAN:
4634 case JVM_SIGNATURE_BYTE:
4635 case JVM_SIGNATURE_CHAR:
4636 case JVM_SIGNATURE_SHORT:
4637 case JVM_SIGNATURE_INT:
4638 case JVM_SIGNATURE_FLOAT:
4639 case JVM_SIGNATURE_LONG:
4640 case JVM_SIGNATURE_DOUBLE:
4641 return signature + 1;
4642 case JVM_SIGNATURE_CLASS: {
4643 if (_major_version < JAVA_1_5_VERSION) {
4644 // Skip over the class name if one is there
4645 char* p = skip_over_field_name(signature + 1, true, --length);
4647 // The next character better be a semicolon
4648 if (p && (p - signature) > 1 && p[0] == ';') {
4649 return p + 1;
4650 }
4651 } else {
4652 // 4900761: For class version > 48, any unicode is allowed in class name.
4653 length--;
4654 signature++;
4655 while (length > 0 && signature[0] != ';') {
4656 if (signature[0] == '.') {
4657 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4658 }
4659 length--;
4660 signature++;
4661 }
4662 if (signature[0] == ';') { return signature + 1; }
4663 }
4665 return NULL;
4666 }
4667 case JVM_SIGNATURE_ARRAY:
4668 array_dim++;
4669 if (array_dim > 255) {
4670 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4671 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4672 }
4673 // The rest of what's there better be a legal signature
4674 signature++;
4675 length--;
4676 void_ok = false;
4677 break;
4679 default:
4680 return NULL;
4681 }
4682 }
4683 return NULL;
4684 }