Thu, 22 Dec 2011 12:50:42 -0800
7122253: Instrumentation.retransformClasses() leaks class bytes
Summary: Change ClassFileParser::parseClassFile() to use the instanceKlass:_cached_class_file_bytes field to avoid leaking the cache.
Reviewed-by: coleenp, acorn, poonam
1 /*
2 * Copyright (c) 1997, 2011, 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(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(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(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 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
325 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
326 u2 length = cfs->get_u2_fast();
327 guarantee_property(
328 length >= 1, "Illegal constant pool size %u in class file %s",
329 length, CHECK_(nullHandle));
330 constantPoolOop constant_pool =
331 oopFactory::new_constantPool(length,
332 oopDesc::IsSafeConc,
333 CHECK_(nullHandle));
334 constantPoolHandle cp (THREAD, constant_pool);
336 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
337 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
339 // parsing constant pool entries
340 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
342 int index = 1; // declared outside of loops for portability
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_cp_range(klass_ref_index, length) &&
360 is_klass_reference(cp, klass_ref_index),
361 "Invalid constant pool index %u in class file %s",
362 klass_ref_index,
363 CHECK_(nullHandle));
364 check_property(valid_cp_range(name_and_type_ref_index, length) &&
365 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
366 "Invalid constant pool index %u in class file %s",
367 name_and_type_ref_index,
368 CHECK_(nullHandle));
369 break;
370 }
371 case JVM_CONSTANT_String :
372 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
373 break;
374 case JVM_CONSTANT_Integer :
375 break;
376 case JVM_CONSTANT_Float :
377 break;
378 case JVM_CONSTANT_Long :
379 case JVM_CONSTANT_Double :
380 index++;
381 check_property(
382 (index < length && cp->tag_at(index).is_invalid()),
383 "Improper constant pool long/double index %u in class file %s",
384 index, CHECK_(nullHandle));
385 break;
386 case JVM_CONSTANT_NameAndType : {
387 if (!_need_verify) break;
388 int name_ref_index = cp->name_ref_index_at(index);
389 int signature_ref_index = cp->signature_ref_index_at(index);
390 check_property(
391 valid_cp_range(name_ref_index, length) &&
392 cp->tag_at(name_ref_index).is_utf8(),
393 "Invalid constant pool index %u in class file %s",
394 name_ref_index, CHECK_(nullHandle));
395 check_property(
396 valid_cp_range(signature_ref_index, length) &&
397 cp->tag_at(signature_ref_index).is_utf8(),
398 "Invalid constant pool index %u in class file %s",
399 signature_ref_index, CHECK_(nullHandle));
400 break;
401 }
402 case JVM_CONSTANT_Utf8 :
403 break;
404 case JVM_CONSTANT_UnresolvedClass : // fall-through
405 case JVM_CONSTANT_UnresolvedClassInError:
406 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
407 break;
408 case JVM_CONSTANT_ClassIndex :
409 {
410 int class_index = cp->klass_index_at(index);
411 check_property(
412 valid_cp_range(class_index, length) &&
413 cp->tag_at(class_index).is_utf8(),
414 "Invalid constant pool index %u in class file %s",
415 class_index, CHECK_(nullHandle));
416 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
417 }
418 break;
419 case JVM_CONSTANT_UnresolvedString :
420 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
421 break;
422 case JVM_CONSTANT_StringIndex :
423 {
424 int string_index = cp->string_index_at(index);
425 check_property(
426 valid_cp_range(string_index, length) &&
427 cp->tag_at(string_index).is_utf8(),
428 "Invalid constant pool index %u in class file %s",
429 string_index, CHECK_(nullHandle));
430 Symbol* sym = cp->symbol_at(string_index);
431 cp->unresolved_string_at_put(index, sym);
432 }
433 break;
434 case JVM_CONSTANT_MethodHandle :
435 {
436 int ref_index = cp->method_handle_index_at(index);
437 check_property(
438 valid_cp_range(ref_index, length) &&
439 EnableInvokeDynamic,
440 "Invalid constant pool index %u in class file %s",
441 ref_index, CHECK_(nullHandle));
442 constantTag tag = cp->tag_at(ref_index);
443 int ref_kind = cp->method_handle_ref_kind_at(index);
444 switch (ref_kind) {
445 case JVM_REF_getField:
446 case JVM_REF_getStatic:
447 case JVM_REF_putField:
448 case JVM_REF_putStatic:
449 check_property(
450 tag.is_field(),
451 "Invalid constant pool index %u in class file %s (not a field)",
452 ref_index, CHECK_(nullHandle));
453 break;
454 case JVM_REF_invokeVirtual:
455 case JVM_REF_invokeStatic:
456 case JVM_REF_invokeSpecial:
457 case JVM_REF_newInvokeSpecial:
458 check_property(
459 tag.is_method(),
460 "Invalid constant pool index %u in class file %s (not a method)",
461 ref_index, CHECK_(nullHandle));
462 break;
463 case JVM_REF_invokeInterface:
464 check_property(
465 tag.is_interface_method(),
466 "Invalid constant pool index %u in class file %s (not an interface method)",
467 ref_index, CHECK_(nullHandle));
468 break;
469 default:
470 classfile_parse_error(
471 "Bad method handle kind at constant pool index %u in class file %s",
472 index, CHECK_(nullHandle));
473 }
474 // Keep the ref_index unchanged. It will be indirected at link-time.
475 }
476 break;
477 case JVM_CONSTANT_MethodType :
478 {
479 int ref_index = cp->method_type_index_at(index);
480 check_property(
481 valid_cp_range(ref_index, length) &&
482 cp->tag_at(ref_index).is_utf8() &&
483 EnableInvokeDynamic,
484 "Invalid constant pool index %u in class file %s",
485 ref_index, CHECK_(nullHandle));
486 }
487 break;
488 case JVM_CONSTANT_InvokeDynamic :
489 {
490 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
491 check_property(valid_cp_range(name_and_type_ref_index, length) &&
492 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
493 "Invalid constant pool index %u in class file %s",
494 name_and_type_ref_index,
495 CHECK_(nullHandle));
496 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
497 break;
498 }
499 default:
500 fatal(err_msg("bad constant pool tag value %u",
501 cp->tag_at(index).value()));
502 ShouldNotReachHere();
503 break;
504 } // end of switch
505 } // end of for
507 if (_cp_patches != NULL) {
508 // need to treat this_class specially...
509 assert(EnableInvokeDynamic, "");
510 int this_class_index;
511 {
512 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
513 u1* mark = cfs->current();
514 u2 flags = cfs->get_u2_fast();
515 this_class_index = cfs->get_u2_fast();
516 cfs->set_current(mark); // revert to mark
517 }
519 for (index = 1; index < length; index++) { // Index 0 is unused
520 if (has_cp_patch_at(index)) {
521 guarantee_property(index != this_class_index,
522 "Illegal constant pool patch to self at %d in class file %s",
523 index, CHECK_(nullHandle));
524 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
525 }
526 }
527 // Ensure that all the patches have been used.
528 for (index = 0; index < _cp_patches->length(); index++) {
529 guarantee_property(!has_cp_patch_at(index),
530 "Unused constant pool patch at %d in class file %s",
531 index, CHECK_(nullHandle));
532 }
533 }
535 if (!_need_verify) {
536 cp_in_error.set_in_error(false);
537 return cp;
538 }
540 // second verification pass - checks the strings are of the right format.
541 // but not yet to the other entries
542 for (index = 1; index < length; index++) {
543 jbyte tag = cp->tag_at(index).value();
544 switch (tag) {
545 case JVM_CONSTANT_UnresolvedClass: {
546 Symbol* class_name = cp->unresolved_klass_at(index);
547 // check the name, even if _cp_patches will overwrite it
548 verify_legal_class_name(class_name, CHECK_(nullHandle));
549 break;
550 }
551 case JVM_CONSTANT_NameAndType: {
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 int sig_index = cp->signature_ref_index_at(index);
554 int name_index = cp->name_ref_index_at(index);
555 Symbol* name = cp->symbol_at(name_index);
556 Symbol* sig = cp->symbol_at(sig_index);
557 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
558 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
559 } else {
560 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
561 }
562 }
563 break;
564 }
565 case JVM_CONSTANT_InvokeDynamic:
566 case JVM_CONSTANT_Fieldref:
567 case JVM_CONSTANT_Methodref:
568 case JVM_CONSTANT_InterfaceMethodref: {
569 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
570 // already verified to be utf8
571 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
572 // already verified to be utf8
573 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
574 Symbol* name = cp->symbol_at(name_ref_index);
575 Symbol* signature = cp->symbol_at(signature_ref_index);
576 if (tag == JVM_CONSTANT_Fieldref) {
577 verify_legal_field_name(name, CHECK_(nullHandle));
578 if (_need_verify && _major_version >= JAVA_7_VERSION) {
579 // Signature is verified above, when iterating NameAndType_info.
580 // Need only to be sure it's the right type.
581 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
582 throwIllegalSignature(
583 "Field", name, signature, CHECK_(nullHandle));
584 }
585 } else {
586 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
587 }
588 } else {
589 verify_legal_method_name(name, CHECK_(nullHandle));
590 if (_need_verify && _major_version >= JAVA_7_VERSION) {
591 // Signature is verified above, when iterating NameAndType_info.
592 // Need only to be sure it's the right type.
593 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
594 throwIllegalSignature(
595 "Method", name, signature, CHECK_(nullHandle));
596 }
597 } else {
598 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
599 }
600 if (tag == JVM_CONSTANT_Methodref) {
601 // 4509014: If a class method name begins with '<', it must be "<init>".
602 assert(name != NULL, "method name in constant pool is null");
603 unsigned int name_len = name->utf8_length();
604 assert(name_len > 0, "bad method name"); // already verified as legal name
605 if (name->byte_at(0) == '<') {
606 if (name != vmSymbols::object_initializer_name()) {
607 classfile_parse_error(
608 "Bad method name at constant pool index %u in class file %s",
609 name_ref_index, CHECK_(nullHandle));
610 }
611 }
612 }
613 }
614 break;
615 }
616 case JVM_CONSTANT_MethodHandle: {
617 int ref_index = cp->method_handle_index_at(index);
618 int ref_kind = cp->method_handle_ref_kind_at(index);
619 switch (ref_kind) {
620 case JVM_REF_invokeVirtual:
621 case JVM_REF_invokeStatic:
622 case JVM_REF_invokeSpecial:
623 case JVM_REF_newInvokeSpecial:
624 {
625 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
626 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
627 Symbol* name = cp->symbol_at(name_ref_index);
628 if (ref_kind == JVM_REF_newInvokeSpecial) {
629 if (name != vmSymbols::object_initializer_name()) {
630 classfile_parse_error(
631 "Bad constructor name at constant pool index %u in class file %s",
632 name_ref_index, CHECK_(nullHandle));
633 }
634 } else {
635 if (name == vmSymbols::object_initializer_name()) {
636 classfile_parse_error(
637 "Bad method name at constant pool index %u in class file %s",
638 name_ref_index, CHECK_(nullHandle));
639 }
640 }
641 }
642 break;
643 // Other ref_kinds are already fully checked in previous pass.
644 }
645 break;
646 }
647 case JVM_CONSTANT_MethodType: {
648 Symbol* no_name = vmSymbols::type_name(); // place holder
649 Symbol* signature = cp->method_type_signature_at(index);
650 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
651 break;
652 }
653 case JVM_CONSTANT_Utf8: {
654 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
655 }
656 } // end of switch
657 } // end of for
659 cp_in_error.set_in_error(false);
660 return cp;
661 }
664 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
665 assert(EnableInvokeDynamic, "");
666 BasicType patch_type = T_VOID;
667 switch (cp->tag_at(index).value()) {
669 case JVM_CONSTANT_UnresolvedClass :
670 // Patching a class means pre-resolving it.
671 // The name in the constant pool is ignored.
672 if (java_lang_Class::is_instance(patch())) {
673 guarantee_property(!java_lang_Class::is_primitive(patch()),
674 "Illegal class patch at %d in class file %s",
675 index, CHECK);
676 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
677 } else {
678 guarantee_property(java_lang_String::is_instance(patch()),
679 "Illegal class patch at %d in class file %s",
680 index, CHECK);
681 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
682 cp->unresolved_klass_at_put(index, name);
683 }
684 break;
686 case JVM_CONSTANT_UnresolvedString :
687 // Patching a string means pre-resolving it.
688 // The spelling in the constant pool is ignored.
689 // The constant reference may be any object whatever.
690 // If it is not a real interned string, the constant is referred
691 // to as a "pseudo-string", and must be presented to the CP
692 // explicitly, because it may require scavenging.
693 cp->pseudo_string_at_put(index, patch());
694 break;
696 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
697 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
698 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
699 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
700 patch_prim:
701 {
702 jvalue value;
703 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
704 guarantee_property(value_type == patch_type,
705 "Illegal primitive patch at %d in class file %s",
706 index, CHECK);
707 switch (value_type) {
708 case T_INT: cp->int_at_put(index, value.i); break;
709 case T_FLOAT: cp->float_at_put(index, value.f); break;
710 case T_LONG: cp->long_at_put(index, value.j); break;
711 case T_DOUBLE: cp->double_at_put(index, value.d); break;
712 default: assert(false, "");
713 }
714 }
715 break;
717 default:
718 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
719 guarantee_property(!has_cp_patch_at(index),
720 "Illegal unexpected patch at %d in class file %s",
721 index, CHECK);
722 return;
723 }
725 // On fall-through, mark the patch as used.
726 clear_cp_patch_at(index);
727 }
731 class NameSigHash: public ResourceObj {
732 public:
733 Symbol* _name; // name
734 Symbol* _sig; // signature
735 NameSigHash* _next; // Next entry in hash table
736 };
739 #define HASH_ROW_SIZE 256
741 unsigned int hash(Symbol* name, Symbol* sig) {
742 unsigned int raw_hash = 0;
743 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
744 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
746 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
747 }
750 void initialize_hashtable(NameSigHash** table) {
751 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
752 }
754 // Return false if the name/sig combination is found in table.
755 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
756 // The old format checker uses heap sort to find duplicates.
757 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
758 // of table since we don't expect Symbol*'s to move.
759 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
760 assert(name != NULL, "name in constant pool is NULL");
762 // First lookup for duplicates
763 int index = hash(name, sig);
764 NameSigHash* entry = table[index];
765 while (entry != NULL) {
766 if (entry->_name == name && entry->_sig == sig) {
767 return false;
768 }
769 entry = entry->_next;
770 }
772 // No duplicate is found, allocate a new entry and fill it.
773 entry = new NameSigHash();
774 entry->_name = name;
775 entry->_sig = sig;
777 // Insert into hash table
778 entry->_next = table[index];
779 table[index] = entry;
781 return true;
782 }
785 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
786 int length,
787 Handle class_loader,
788 Handle protection_domain,
789 Symbol* class_name,
790 TRAPS) {
791 ClassFileStream* cfs = stream();
792 assert(length > 0, "only called for length>0");
793 objArrayHandle nullHandle;
794 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
795 objArrayHandle interfaces (THREAD, interface_oop);
797 int index;
798 for (index = 0; index < length; index++) {
799 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
800 KlassHandle interf;
801 check_property(
802 valid_cp_range(interface_index, cp->length()) &&
803 is_klass_reference(cp, interface_index),
804 "Interface name has bad constant pool index %u in class file %s",
805 interface_index, CHECK_(nullHandle));
806 if (cp->tag_at(interface_index).is_klass()) {
807 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
808 } else {
809 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
811 // Don't need to check legal name because it's checked when parsing constant pool.
812 // But need to make sure it's not an array type.
813 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
814 "Bad interface name in class file %s", CHECK_(nullHandle));
816 // Call resolve_super so classcircularity is checked
817 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
818 unresolved_klass, class_loader, protection_domain,
819 false, CHECK_(nullHandle));
820 interf = KlassHandle(THREAD, k);
822 if (LinkWellKnownClasses) // my super type is well known to me
823 cp->klass_at_put(interface_index, interf()); // eagerly resolve
824 }
826 if (!Klass::cast(interf())->is_interface()) {
827 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
828 }
829 interfaces->obj_at_put(index, interf());
830 }
832 if (!_need_verify || length <= 1) {
833 return interfaces;
834 }
836 // Check if there's any duplicates in interfaces
837 ResourceMark rm(THREAD);
838 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
839 THREAD, NameSigHash*, HASH_ROW_SIZE);
840 initialize_hashtable(interface_names);
841 bool dup = false;
842 {
843 debug_only(No_Safepoint_Verifier nsv;)
844 for (index = 0; index < length; index++) {
845 klassOop k = (klassOop)interfaces->obj_at(index);
846 Symbol* name = instanceKlass::cast(k)->name();
847 // If no duplicates, add (name, NULL) in hashtable interface_names.
848 if (!put_after_lookup(name, NULL, interface_names)) {
849 dup = true;
850 break;
851 }
852 }
853 }
854 if (dup) {
855 classfile_parse_error("Duplicate interface name in class file %s",
856 CHECK_(nullHandle));
857 }
859 return interfaces;
860 }
863 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
864 // Make sure the constant pool entry is of a type appropriate to this field
865 guarantee_property(
866 (constantvalue_index > 0 &&
867 constantvalue_index < cp->length()),
868 "Bad initial value index %u in ConstantValue attribute in class file %s",
869 constantvalue_index, CHECK);
870 constantTag value_type = cp->tag_at(constantvalue_index);
871 switch ( cp->basic_type_for_signature_at(signature_index) ) {
872 case T_LONG:
873 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
874 break;
875 case T_FLOAT:
876 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
877 break;
878 case T_DOUBLE:
879 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
880 break;
881 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
882 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
883 break;
884 case T_OBJECT:
885 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
886 && (value_type.is_string() || value_type.is_unresolved_string())),
887 "Bad string initial value in class file %s", CHECK);
888 break;
889 default:
890 classfile_parse_error(
891 "Unable to set initial value %u in class file %s",
892 constantvalue_index, CHECK);
893 }
894 }
897 // Parse attributes for a field.
898 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
899 u2 attributes_count,
900 bool is_static, u2 signature_index,
901 u2* constantvalue_index_addr,
902 bool* is_synthetic_addr,
903 u2* generic_signature_index_addr,
904 typeArrayHandle* field_annotations,
905 TRAPS) {
906 ClassFileStream* cfs = stream();
907 assert(attributes_count > 0, "length should be greater than 0");
908 u2 constantvalue_index = 0;
909 u2 generic_signature_index = 0;
910 bool is_synthetic = false;
911 u1* runtime_visible_annotations = NULL;
912 int runtime_visible_annotations_length = 0;
913 u1* runtime_invisible_annotations = NULL;
914 int runtime_invisible_annotations_length = 0;
915 while (attributes_count--) {
916 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
917 u2 attribute_name_index = cfs->get_u2_fast();
918 u4 attribute_length = cfs->get_u4_fast();
919 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
920 cp->tag_at(attribute_name_index).is_utf8(),
921 "Invalid field attribute index %u in class file %s",
922 attribute_name_index,
923 CHECK);
924 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
925 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
926 // ignore if non-static
927 if (constantvalue_index != 0) {
928 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
929 }
930 check_property(
931 attribute_length == 2,
932 "Invalid ConstantValue field attribute length %u in class file %s",
933 attribute_length, CHECK);
934 constantvalue_index = cfs->get_u2(CHECK);
935 if (_need_verify) {
936 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
937 }
938 } else if (attribute_name == vmSymbols::tag_synthetic()) {
939 if (attribute_length != 0) {
940 classfile_parse_error(
941 "Invalid Synthetic field attribute length %u in class file %s",
942 attribute_length, CHECK);
943 }
944 is_synthetic = true;
945 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
946 if (attribute_length != 0) {
947 classfile_parse_error(
948 "Invalid Deprecated field attribute length %u in class file %s",
949 attribute_length, CHECK);
950 }
951 } else if (_major_version >= JAVA_1_5_VERSION) {
952 if (attribute_name == vmSymbols::tag_signature()) {
953 if (attribute_length != 2) {
954 classfile_parse_error(
955 "Wrong size %u for field's Signature attribute in class file %s",
956 attribute_length, CHECK);
957 }
958 generic_signature_index = cfs->get_u2(CHECK);
959 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
960 runtime_visible_annotations_length = attribute_length;
961 runtime_visible_annotations = cfs->get_u1_buffer();
962 assert(runtime_visible_annotations != NULL, "null visible annotations");
963 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
964 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
965 runtime_invisible_annotations_length = attribute_length;
966 runtime_invisible_annotations = cfs->get_u1_buffer();
967 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
968 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
969 } else {
970 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
971 }
972 } else {
973 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
974 }
975 }
977 *constantvalue_index_addr = constantvalue_index;
978 *is_synthetic_addr = is_synthetic;
979 *generic_signature_index_addr = generic_signature_index;
980 *field_annotations = assemble_annotations(runtime_visible_annotations,
981 runtime_visible_annotations_length,
982 runtime_invisible_annotations,
983 runtime_invisible_annotations_length,
984 CHECK);
985 return;
986 }
989 // Field allocation types. Used for computing field offsets.
991 enum FieldAllocationType {
992 STATIC_OOP, // Oops
993 STATIC_BYTE, // Boolean, Byte, char
994 STATIC_SHORT, // shorts
995 STATIC_WORD, // ints
996 STATIC_DOUBLE, // aligned long or double
997 NONSTATIC_OOP,
998 NONSTATIC_BYTE,
999 NONSTATIC_SHORT,
1000 NONSTATIC_WORD,
1001 NONSTATIC_DOUBLE,
1002 MAX_FIELD_ALLOCATION_TYPE,
1003 BAD_ALLOCATION_TYPE = -1
1004 };
1006 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1007 BAD_ALLOCATION_TYPE, // 0
1008 BAD_ALLOCATION_TYPE, // 1
1009 BAD_ALLOCATION_TYPE, // 2
1010 BAD_ALLOCATION_TYPE, // 3
1011 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1012 NONSTATIC_SHORT, // T_CHAR = 5,
1013 NONSTATIC_WORD, // T_FLOAT = 6,
1014 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1015 NONSTATIC_BYTE, // T_BYTE = 8,
1016 NONSTATIC_SHORT, // T_SHORT = 9,
1017 NONSTATIC_WORD, // T_INT = 10,
1018 NONSTATIC_DOUBLE, // T_LONG = 11,
1019 NONSTATIC_OOP, // T_OBJECT = 12,
1020 NONSTATIC_OOP, // T_ARRAY = 13,
1021 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1022 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1023 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1024 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1025 BAD_ALLOCATION_TYPE, // 0
1026 BAD_ALLOCATION_TYPE, // 1
1027 BAD_ALLOCATION_TYPE, // 2
1028 BAD_ALLOCATION_TYPE, // 3
1029 STATIC_BYTE , // T_BOOLEAN = 4,
1030 STATIC_SHORT, // T_CHAR = 5,
1031 STATIC_WORD, // T_FLOAT = 6,
1032 STATIC_DOUBLE, // T_DOUBLE = 7,
1033 STATIC_BYTE, // T_BYTE = 8,
1034 STATIC_SHORT, // T_SHORT = 9,
1035 STATIC_WORD, // T_INT = 10,
1036 STATIC_DOUBLE, // T_LONG = 11,
1037 STATIC_OOP, // T_OBJECT = 12,
1038 STATIC_OOP, // T_ARRAY = 13,
1039 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1040 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1041 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1042 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1043 };
1045 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1046 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1047 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1048 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1049 return result;
1050 }
1052 class FieldAllocationCount: public ResourceObj {
1053 public:
1054 unsigned int count[MAX_FIELD_ALLOCATION_TYPE];
1056 FieldAllocationCount() {
1057 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1058 count[i] = 0;
1059 }
1060 }
1062 FieldAllocationType update(bool is_static, BasicType type) {
1063 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1064 count[atype]++;
1065 return atype;
1066 }
1067 };
1070 typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
1071 constantPoolHandle cp, bool is_interface,
1072 FieldAllocationCount *fac,
1073 objArrayHandle* fields_annotations,
1074 int* java_fields_count_ptr, TRAPS) {
1075 ClassFileStream* cfs = stream();
1076 typeArrayHandle nullHandle;
1077 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1078 u2 length = cfs->get_u2_fast();
1079 *java_fields_count_ptr = length;
1081 int num_injected = 0;
1082 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1084 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1085 typeArrayOop new_fields = oopFactory::new_permanent_shortArray((length + num_injected) * FieldInfo::field_slots, CHECK_(nullHandle));
1086 typeArrayHandle fields(THREAD, new_fields);
1088 typeArrayHandle field_annotations;
1089 for (int n = 0; n < length; n++) {
1090 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1092 AccessFlags access_flags;
1093 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1094 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1095 access_flags.set_flags(flags);
1097 u2 name_index = cfs->get_u2_fast();
1098 int cp_size = cp->length();
1099 check_property(
1100 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1101 "Invalid constant pool index %u for field name in class file %s",
1102 name_index, CHECK_(nullHandle));
1103 Symbol* name = cp->symbol_at(name_index);
1104 verify_legal_field_name(name, CHECK_(nullHandle));
1106 u2 signature_index = cfs->get_u2_fast();
1107 check_property(
1108 valid_cp_range(signature_index, cp_size) &&
1109 cp->tag_at(signature_index).is_utf8(),
1110 "Invalid constant pool index %u for field signature in class file %s",
1111 signature_index, CHECK_(nullHandle));
1112 Symbol* sig = cp->symbol_at(signature_index);
1113 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1115 u2 constantvalue_index = 0;
1116 bool is_synthetic = false;
1117 u2 generic_signature_index = 0;
1118 bool is_static = access_flags.is_static();
1120 u2 attributes_count = cfs->get_u2_fast();
1121 if (attributes_count > 0) {
1122 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1123 &constantvalue_index, &is_synthetic,
1124 &generic_signature_index, &field_annotations,
1125 CHECK_(nullHandle));
1126 if (field_annotations.not_null()) {
1127 if (fields_annotations->is_null()) {
1128 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1129 *fields_annotations = objArrayHandle(THREAD, md);
1130 }
1131 (*fields_annotations)->obj_at_put(n, field_annotations());
1132 }
1133 if (is_synthetic) {
1134 access_flags.set_is_synthetic();
1135 }
1136 }
1138 FieldInfo* field = FieldInfo::from_field_array(fields(), n);
1139 field->initialize(access_flags.as_short(),
1140 name_index,
1141 signature_index,
1142 constantvalue_index,
1143 generic_signature_index,
1144 0);
1146 BasicType type = cp->basic_type_for_signature_at(signature_index);
1148 // Remember how many oops we encountered and compute allocation type
1149 FieldAllocationType atype = fac->update(is_static, type);
1151 // The correct offset is computed later (all oop fields will be located together)
1152 // We temporarily store the allocation type in the offset field
1153 field->set_offset(atype);
1154 }
1156 if (num_injected != 0) {
1157 int index = length;
1158 for (int n = 0; n < num_injected; n++) {
1159 // Check for duplicates
1160 if (injected[n].may_be_java) {
1161 Symbol* name = injected[n].name();
1162 Symbol* signature = injected[n].signature();
1163 bool duplicate = false;
1164 for (int i = 0; i < length; i++) {
1165 FieldInfo* f = FieldInfo::from_field_array(fields(), i);
1166 if (name == cp->symbol_at(f->name_index()) &&
1167 signature == cp->symbol_at(f->signature_index())) {
1168 // Symbol is desclared in Java so skip this one
1169 duplicate = true;
1170 break;
1171 }
1172 }
1173 if (duplicate) {
1174 // These will be removed from the field array at the end
1175 continue;
1176 }
1177 }
1179 // Injected field
1180 FieldInfo* field = FieldInfo::from_field_array(fields(), index);
1181 field->initialize(JVM_ACC_FIELD_INTERNAL,
1182 injected[n].name_index,
1183 injected[n].signature_index,
1184 0,
1185 0,
1186 0);
1188 BasicType type = FieldType::basic_type(injected[n].signature());
1190 // Remember how many oops we encountered and compute allocation type
1191 FieldAllocationType atype = fac->update(false, type);
1193 // The correct offset is computed later (all oop fields will be located together)
1194 // We temporarily store the allocation type in the offset field
1195 field->set_offset(atype);
1196 index++;
1197 }
1199 if (index < length + num_injected) {
1200 // sometimes injected fields already exist in the Java source so
1201 // the fields array could be too long. In that case trim the
1202 // fields array.
1203 new_fields = oopFactory::new_permanent_shortArray(index * FieldInfo::field_slots, CHECK_(nullHandle));
1204 for (int i = 0; i < index * FieldInfo::field_slots; i++) {
1205 new_fields->short_at_put(i, fields->short_at(i));
1206 }
1207 fields = new_fields;
1208 }
1209 }
1211 if (_need_verify && length > 1) {
1212 // Check duplicated fields
1213 ResourceMark rm(THREAD);
1214 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1215 THREAD, NameSigHash*, HASH_ROW_SIZE);
1216 initialize_hashtable(names_and_sigs);
1217 bool dup = false;
1218 {
1219 debug_only(No_Safepoint_Verifier nsv;)
1220 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1221 Symbol* name = fs.name();
1222 Symbol* sig = fs.signature();
1223 // If no duplicates, add name/signature in hashtable names_and_sigs.
1224 if (!put_after_lookup(name, sig, names_and_sigs)) {
1225 dup = true;
1226 break;
1227 }
1228 }
1229 }
1230 if (dup) {
1231 classfile_parse_error("Duplicate field name&signature in class file %s",
1232 CHECK_(nullHandle));
1233 }
1234 }
1236 return fields;
1237 }
1240 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1241 while (length-- > 0) {
1242 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1243 }
1244 }
1247 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1248 u4 exception_table_length,
1249 constantPoolHandle cp,
1250 TRAPS) {
1251 ClassFileStream* cfs = stream();
1252 typeArrayHandle nullHandle;
1254 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1255 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1256 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1258 int index = 0;
1259 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1260 for (unsigned int i = 0; i < exception_table_length; i++) {
1261 u2 start_pc = cfs->get_u2_fast();
1262 u2 end_pc = cfs->get_u2_fast();
1263 u2 handler_pc = cfs->get_u2_fast();
1264 u2 catch_type_index = cfs->get_u2_fast();
1265 // Will check legal target after parsing code array in verifier.
1266 if (_need_verify) {
1267 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1268 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1269 guarantee_property(handler_pc < code_length,
1270 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1271 if (catch_type_index != 0) {
1272 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1273 is_klass_reference(cp, catch_type_index),
1274 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1275 }
1276 }
1277 exception_handlers->int_at_put(index++, start_pc);
1278 exception_handlers->int_at_put(index++, end_pc);
1279 exception_handlers->int_at_put(index++, handler_pc);
1280 exception_handlers->int_at_put(index++, catch_type_index);
1281 }
1282 return exception_handlers;
1283 }
1285 void ClassFileParser::parse_linenumber_table(
1286 u4 code_attribute_length, u4 code_length,
1287 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1288 ClassFileStream* cfs = stream();
1289 unsigned int num_entries = cfs->get_u2(CHECK);
1291 // Each entry is a u2 start_pc, and a u2 line_number
1292 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1294 // Verify line number attribute and table length
1295 check_property(
1296 code_attribute_length == sizeof(u2) + length_in_bytes,
1297 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1299 cfs->guarantee_more(length_in_bytes, CHECK);
1301 if ((*write_stream) == NULL) {
1302 if (length_in_bytes > fixed_buffer_size) {
1303 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1304 } else {
1305 (*write_stream) = new CompressedLineNumberWriteStream(
1306 linenumbertable_buffer, fixed_buffer_size);
1307 }
1308 }
1310 while (num_entries-- > 0) {
1311 u2 bci = cfs->get_u2_fast(); // start_pc
1312 u2 line = cfs->get_u2_fast(); // line_number
1313 guarantee_property(bci < code_length,
1314 "Invalid pc in LineNumberTable in class file %s", CHECK);
1315 (*write_stream)->write_pair(bci, line);
1316 }
1317 }
1320 // Class file LocalVariableTable elements.
1321 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1322 public:
1323 u2 start_bci;
1324 u2 length;
1325 u2 name_cp_index;
1326 u2 descriptor_cp_index;
1327 u2 slot;
1328 };
1331 class LVT_Hash: public CHeapObj {
1332 public:
1333 LocalVariableTableElement *_elem; // element
1334 LVT_Hash* _next; // Next entry in hash table
1335 };
1337 unsigned int hash(LocalVariableTableElement *elem) {
1338 unsigned int raw_hash = elem->start_bci;
1340 raw_hash = elem->length + raw_hash * 37;
1341 raw_hash = elem->name_cp_index + raw_hash * 37;
1342 raw_hash = elem->slot + raw_hash * 37;
1344 return raw_hash % HASH_ROW_SIZE;
1345 }
1347 void initialize_hashtable(LVT_Hash** table) {
1348 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1349 table[i] = NULL;
1350 }
1351 }
1353 void clear_hashtable(LVT_Hash** table) {
1354 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1355 LVT_Hash* current = table[i];
1356 LVT_Hash* next;
1357 while (current != NULL) {
1358 next = current->_next;
1359 current->_next = NULL;
1360 delete(current);
1361 current = next;
1362 }
1363 table[i] = NULL;
1364 }
1365 }
1367 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1368 LVT_Hash* entry = table[index];
1370 /*
1371 * 3-tuple start_bci/length/slot has to be unique key,
1372 * so the following comparison seems to be redundant:
1373 * && elem->name_cp_index == entry->_elem->name_cp_index
1374 */
1375 while (entry != NULL) {
1376 if (elem->start_bci == entry->_elem->start_bci
1377 && elem->length == entry->_elem->length
1378 && elem->name_cp_index == entry->_elem->name_cp_index
1379 && elem->slot == entry->_elem->slot
1380 ) {
1381 return entry;
1382 }
1383 entry = entry->_next;
1384 }
1385 return NULL;
1386 }
1388 // Return false if the local variable is found in table.
1389 // Return true if no duplicate is found.
1390 // And local variable is added as a new entry in table.
1391 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1392 // First lookup for duplicates
1393 int index = hash(elem);
1394 LVT_Hash* entry = LVT_lookup(elem, index, table);
1396 if (entry != NULL) {
1397 return false;
1398 }
1399 // No duplicate is found, allocate a new entry and fill it.
1400 if ((entry = new LVT_Hash()) == NULL) {
1401 return false;
1402 }
1403 entry->_elem = elem;
1405 // Insert into hash table
1406 entry->_next = table[index];
1407 table[index] = entry;
1409 return true;
1410 }
1412 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1413 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1414 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1415 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1416 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1417 lvt->signature_cp_index = 0;
1418 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1419 }
1421 // Function is used to parse both attributes:
1422 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1423 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1424 u2 max_locals,
1425 u4 code_attribute_length,
1426 constantPoolHandle cp,
1427 u2* localvariable_table_length,
1428 bool isLVTT,
1429 TRAPS) {
1430 ClassFileStream* cfs = stream();
1431 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1432 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1433 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1434 // Verify local variable table attribute has right length
1435 if (_need_verify) {
1436 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1437 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1438 }
1439 u2* localvariable_table_start = cfs->get_u2_buffer();
1440 assert(localvariable_table_start != NULL, "null local variable table");
1441 if (!_need_verify) {
1442 cfs->skip_u2_fast(size);
1443 } else {
1444 cfs->guarantee_more(size * 2, CHECK_NULL);
1445 for(int i = 0; i < (*localvariable_table_length); i++) {
1446 u2 start_pc = cfs->get_u2_fast();
1447 u2 length = cfs->get_u2_fast();
1448 u2 name_index = cfs->get_u2_fast();
1449 u2 descriptor_index = cfs->get_u2_fast();
1450 u2 index = cfs->get_u2_fast();
1451 // Assign to a u4 to avoid overflow
1452 u4 end_pc = (u4)start_pc + (u4)length;
1454 if (start_pc >= code_length) {
1455 classfile_parse_error(
1456 "Invalid start_pc %u in %s in class file %s",
1457 start_pc, tbl_name, CHECK_NULL);
1458 }
1459 if (end_pc > code_length) {
1460 classfile_parse_error(
1461 "Invalid length %u in %s in class file %s",
1462 length, tbl_name, CHECK_NULL);
1463 }
1464 int cp_size = cp->length();
1465 guarantee_property(
1466 valid_cp_range(name_index, cp_size) &&
1467 cp->tag_at(name_index).is_utf8(),
1468 "Name index %u in %s has bad constant type in class file %s",
1469 name_index, tbl_name, CHECK_NULL);
1470 guarantee_property(
1471 valid_cp_range(descriptor_index, cp_size) &&
1472 cp->tag_at(descriptor_index).is_utf8(),
1473 "Signature index %u in %s has bad constant type in class file %s",
1474 descriptor_index, tbl_name, CHECK_NULL);
1476 Symbol* name = cp->symbol_at(name_index);
1477 Symbol* sig = cp->symbol_at(descriptor_index);
1478 verify_legal_field_name(name, CHECK_NULL);
1479 u2 extra_slot = 0;
1480 if (!isLVTT) {
1481 verify_legal_field_signature(name, sig, CHECK_NULL);
1483 // 4894874: check special cases for double and long local variables
1484 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1485 sig == vmSymbols::type_signature(T_LONG)) {
1486 extra_slot = 1;
1487 }
1488 }
1489 guarantee_property((index + extra_slot) < max_locals,
1490 "Invalid index %u in %s in class file %s",
1491 index, tbl_name, CHECK_NULL);
1492 }
1493 }
1494 return localvariable_table_start;
1495 }
1498 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1499 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1500 ClassFileStream* cfs = stream();
1501 u2 index = 0; // index in the array with long/double occupying two slots
1502 u4 i1 = *u1_index;
1503 u4 i2 = *u2_index + 1;
1504 for(int i = 0; i < array_length; i++) {
1505 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1506 index++;
1507 if (tag == ITEM_Long || tag == ITEM_Double) {
1508 index++;
1509 } else if (tag == ITEM_Object) {
1510 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1511 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1512 is_klass_reference(cp, class_index),
1513 "Bad class index %u in StackMap in class file %s",
1514 class_index, CHECK);
1515 } else if (tag == ITEM_Uninitialized) {
1516 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1517 guarantee_property(
1518 offset < code_length,
1519 "Bad uninitialized type offset %u in StackMap in class file %s",
1520 offset, CHECK);
1521 } else {
1522 guarantee_property(
1523 tag <= (u1)ITEM_Uninitialized,
1524 "Unknown variable type %u in StackMap in class file %s",
1525 tag, CHECK);
1526 }
1527 }
1528 u2_array[*u2_index] = index;
1529 *u1_index = i1;
1530 *u2_index = i2;
1531 }
1533 typeArrayOop ClassFileParser::parse_stackmap_table(
1534 u4 code_attribute_length, TRAPS) {
1535 if (code_attribute_length == 0)
1536 return NULL;
1538 ClassFileStream* cfs = stream();
1539 u1* stackmap_table_start = cfs->get_u1_buffer();
1540 assert(stackmap_table_start != NULL, "null stackmap table");
1542 // check code_attribute_length first
1543 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1545 if (!_need_verify && !DumpSharedSpaces) {
1546 return NULL;
1547 }
1549 typeArrayOop stackmap_data =
1550 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1552 stackmap_data->set_length(code_attribute_length);
1553 memcpy((void*)stackmap_data->byte_at_addr(0),
1554 (void*)stackmap_table_start, code_attribute_length);
1555 return stackmap_data;
1556 }
1558 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1559 u4 method_attribute_length,
1560 constantPoolHandle cp, TRAPS) {
1561 ClassFileStream* cfs = stream();
1562 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1563 *checked_exceptions_length = cfs->get_u2_fast();
1564 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1565 u2* checked_exceptions_start = cfs->get_u2_buffer();
1566 assert(checked_exceptions_start != NULL, "null checked exceptions");
1567 if (!_need_verify) {
1568 cfs->skip_u2_fast(size);
1569 } else {
1570 // Verify each value in the checked exception table
1571 u2 checked_exception;
1572 u2 len = *checked_exceptions_length;
1573 cfs->guarantee_more(2 * len, CHECK_NULL);
1574 for (int i = 0; i < len; i++) {
1575 checked_exception = cfs->get_u2_fast();
1576 check_property(
1577 valid_cp_range(checked_exception, cp->length()) &&
1578 is_klass_reference(cp, checked_exception),
1579 "Exception name has bad type at constant pool %u in class file %s",
1580 checked_exception, CHECK_NULL);
1581 }
1582 }
1583 // check exceptions attribute length
1584 if (_need_verify) {
1585 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1586 sizeof(u2) * size),
1587 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1588 }
1589 return checked_exceptions_start;
1590 }
1592 void ClassFileParser::throwIllegalSignature(
1593 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1594 ResourceMark rm(THREAD);
1595 Exceptions::fthrow(THREAD_AND_LOCATION,
1596 vmSymbols::java_lang_ClassFormatError(),
1597 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1598 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1599 }
1601 #define MAX_ARGS_SIZE 255
1602 #define MAX_CODE_SIZE 65535
1603 #define INITIAL_MAX_LVT_NUMBER 256
1605 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1606 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1607 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1608 // entire method attribute is parsed.
1609 //
1610 // The promoted_flags parameter is used to pass relevant access_flags
1611 // from the method back up to the containing klass. These flag values
1612 // are added to klass's access_flags.
1614 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1615 AccessFlags *promoted_flags,
1616 typeArrayHandle* method_annotations,
1617 typeArrayHandle* method_parameter_annotations,
1618 typeArrayHandle* method_default_annotations,
1619 TRAPS) {
1620 ClassFileStream* cfs = stream();
1621 methodHandle nullHandle;
1622 ResourceMark rm(THREAD);
1623 // Parse fixed parts
1624 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1626 int flags = cfs->get_u2_fast();
1627 u2 name_index = cfs->get_u2_fast();
1628 int cp_size = cp->length();
1629 check_property(
1630 valid_cp_range(name_index, cp_size) &&
1631 cp->tag_at(name_index).is_utf8(),
1632 "Illegal constant pool index %u for method name in class file %s",
1633 name_index, CHECK_(nullHandle));
1634 Symbol* name = cp->symbol_at(name_index);
1635 verify_legal_method_name(name, CHECK_(nullHandle));
1637 u2 signature_index = cfs->get_u2_fast();
1638 guarantee_property(
1639 valid_cp_range(signature_index, cp_size) &&
1640 cp->tag_at(signature_index).is_utf8(),
1641 "Illegal constant pool index %u for method signature in class file %s",
1642 signature_index, CHECK_(nullHandle));
1643 Symbol* signature = cp->symbol_at(signature_index);
1645 AccessFlags access_flags;
1646 if (name == vmSymbols::class_initializer_name()) {
1647 // We ignore the other access flags for a valid class initializer.
1648 // (JVM Spec 2nd ed., chapter 4.6)
1649 if (_major_version < 51) { // backward compatibility
1650 flags = JVM_ACC_STATIC;
1651 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1652 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1653 }
1654 } else {
1655 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1656 }
1658 int args_size = -1; // only used when _need_verify is true
1659 if (_need_verify) {
1660 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1661 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1662 if (args_size > MAX_ARGS_SIZE) {
1663 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1664 }
1665 }
1667 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1669 // Default values for code and exceptions attribute elements
1670 u2 max_stack = 0;
1671 u2 max_locals = 0;
1672 u4 code_length = 0;
1673 u1* code_start = 0;
1674 u2 exception_table_length = 0;
1675 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1676 u2 checked_exceptions_length = 0;
1677 u2* checked_exceptions_start = NULL;
1678 CompressedLineNumberWriteStream* linenumber_table = NULL;
1679 int linenumber_table_length = 0;
1680 int total_lvt_length = 0;
1681 u2 lvt_cnt = 0;
1682 u2 lvtt_cnt = 0;
1683 bool lvt_allocated = false;
1684 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1685 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1686 u2* localvariable_table_length;
1687 u2** localvariable_table_start;
1688 u2* localvariable_type_table_length;
1689 u2** localvariable_type_table_start;
1690 bool parsed_code_attribute = false;
1691 bool parsed_checked_exceptions_attribute = false;
1692 bool parsed_stackmap_attribute = false;
1693 // stackmap attribute - JDK1.5
1694 typeArrayHandle stackmap_data;
1695 u2 generic_signature_index = 0;
1696 u1* runtime_visible_annotations = NULL;
1697 int runtime_visible_annotations_length = 0;
1698 u1* runtime_invisible_annotations = NULL;
1699 int runtime_invisible_annotations_length = 0;
1700 u1* runtime_visible_parameter_annotations = NULL;
1701 int runtime_visible_parameter_annotations_length = 0;
1702 u1* runtime_invisible_parameter_annotations = NULL;
1703 int runtime_invisible_parameter_annotations_length = 0;
1704 u1* annotation_default = NULL;
1705 int annotation_default_length = 0;
1707 // Parse code and exceptions attribute
1708 u2 method_attributes_count = cfs->get_u2_fast();
1709 while (method_attributes_count--) {
1710 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1711 u2 method_attribute_name_index = cfs->get_u2_fast();
1712 u4 method_attribute_length = cfs->get_u4_fast();
1713 check_property(
1714 valid_cp_range(method_attribute_name_index, cp_size) &&
1715 cp->tag_at(method_attribute_name_index).is_utf8(),
1716 "Invalid method attribute name index %u in class file %s",
1717 method_attribute_name_index, CHECK_(nullHandle));
1719 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1720 if (method_attribute_name == vmSymbols::tag_code()) {
1721 // Parse Code attribute
1722 if (_need_verify) {
1723 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1724 "Code attribute in native or abstract methods in class file %s",
1725 CHECK_(nullHandle));
1726 }
1727 if (parsed_code_attribute) {
1728 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1729 }
1730 parsed_code_attribute = true;
1732 // Stack size, locals size, and code size
1733 if (_major_version == 45 && _minor_version <= 2) {
1734 cfs->guarantee_more(4, CHECK_(nullHandle));
1735 max_stack = cfs->get_u1_fast();
1736 max_locals = cfs->get_u1_fast();
1737 code_length = cfs->get_u2_fast();
1738 } else {
1739 cfs->guarantee_more(8, CHECK_(nullHandle));
1740 max_stack = cfs->get_u2_fast();
1741 max_locals = cfs->get_u2_fast();
1742 code_length = cfs->get_u4_fast();
1743 }
1744 if (_need_verify) {
1745 guarantee_property(args_size <= max_locals,
1746 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1747 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1748 "Invalid method Code length %u in class file %s",
1749 code_length, CHECK_(nullHandle));
1750 }
1751 // Code pointer
1752 code_start = cfs->get_u1_buffer();
1753 assert(code_start != NULL, "null code start");
1754 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1755 cfs->skip_u1_fast(code_length);
1757 // Exception handler table
1758 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1759 exception_table_length = cfs->get_u2_fast();
1760 if (exception_table_length > 0) {
1761 exception_handlers =
1762 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1763 }
1765 // Parse additional attributes in code attribute
1766 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1767 u2 code_attributes_count = cfs->get_u2_fast();
1769 unsigned int calculated_attribute_length = 0;
1771 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1772 calculated_attribute_length =
1773 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1774 } else {
1775 // max_stack, locals and length are smaller in pre-version 45.2 classes
1776 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1777 }
1778 calculated_attribute_length +=
1779 code_length +
1780 sizeof(exception_table_length) +
1781 sizeof(code_attributes_count) +
1782 exception_table_length *
1783 ( sizeof(u2) + // start_pc
1784 sizeof(u2) + // end_pc
1785 sizeof(u2) + // handler_pc
1786 sizeof(u2) ); // catch_type_index
1788 while (code_attributes_count--) {
1789 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1790 u2 code_attribute_name_index = cfs->get_u2_fast();
1791 u4 code_attribute_length = cfs->get_u4_fast();
1792 calculated_attribute_length += code_attribute_length +
1793 sizeof(code_attribute_name_index) +
1794 sizeof(code_attribute_length);
1795 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1796 cp->tag_at(code_attribute_name_index).is_utf8(),
1797 "Invalid code attribute name index %u in class file %s",
1798 code_attribute_name_index,
1799 CHECK_(nullHandle));
1800 if (LoadLineNumberTables &&
1801 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1802 // Parse and compress line number table
1803 parse_linenumber_table(code_attribute_length, code_length,
1804 &linenumber_table, CHECK_(nullHandle));
1806 } else if (LoadLocalVariableTables &&
1807 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1808 // Parse local variable table
1809 if (!lvt_allocated) {
1810 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1811 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1812 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1813 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1814 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1815 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1816 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1817 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1818 lvt_allocated = true;
1819 }
1820 if (lvt_cnt == max_lvt_cnt) {
1821 max_lvt_cnt <<= 1;
1822 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1823 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1824 }
1825 localvariable_table_start[lvt_cnt] =
1826 parse_localvariable_table(code_length,
1827 max_locals,
1828 code_attribute_length,
1829 cp,
1830 &localvariable_table_length[lvt_cnt],
1831 false, // is not LVTT
1832 CHECK_(nullHandle));
1833 total_lvt_length += localvariable_table_length[lvt_cnt];
1834 lvt_cnt++;
1835 } else if (LoadLocalVariableTypeTables &&
1836 _major_version >= JAVA_1_5_VERSION &&
1837 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1838 if (!lvt_allocated) {
1839 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1840 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1841 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1842 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1843 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1844 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1845 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1846 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1847 lvt_allocated = true;
1848 }
1849 // Parse local variable type table
1850 if (lvtt_cnt == max_lvtt_cnt) {
1851 max_lvtt_cnt <<= 1;
1852 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1853 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1854 }
1855 localvariable_type_table_start[lvtt_cnt] =
1856 parse_localvariable_table(code_length,
1857 max_locals,
1858 code_attribute_length,
1859 cp,
1860 &localvariable_type_table_length[lvtt_cnt],
1861 true, // is LVTT
1862 CHECK_(nullHandle));
1863 lvtt_cnt++;
1864 } else if (UseSplitVerifier &&
1865 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1866 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1867 // Stack map is only needed by the new verifier in JDK1.5.
1868 if (parsed_stackmap_attribute) {
1869 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1870 }
1871 typeArrayOop sm =
1872 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1873 stackmap_data = typeArrayHandle(THREAD, sm);
1874 parsed_stackmap_attribute = true;
1875 } else {
1876 // Skip unknown attributes
1877 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1878 }
1879 }
1880 // check method attribute length
1881 if (_need_verify) {
1882 guarantee_property(method_attribute_length == calculated_attribute_length,
1883 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1884 }
1885 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1886 // Parse Exceptions attribute
1887 if (parsed_checked_exceptions_attribute) {
1888 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1889 }
1890 parsed_checked_exceptions_attribute = true;
1891 checked_exceptions_start =
1892 parse_checked_exceptions(&checked_exceptions_length,
1893 method_attribute_length,
1894 cp, CHECK_(nullHandle));
1895 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1896 if (method_attribute_length != 0) {
1897 classfile_parse_error(
1898 "Invalid Synthetic method attribute length %u in class file %s",
1899 method_attribute_length, CHECK_(nullHandle));
1900 }
1901 // Should we check that there hasn't already been a synthetic attribute?
1902 access_flags.set_is_synthetic();
1903 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1904 if (method_attribute_length != 0) {
1905 classfile_parse_error(
1906 "Invalid Deprecated method attribute length %u in class file %s",
1907 method_attribute_length, CHECK_(nullHandle));
1908 }
1909 } else if (_major_version >= JAVA_1_5_VERSION) {
1910 if (method_attribute_name == vmSymbols::tag_signature()) {
1911 if (method_attribute_length != 2) {
1912 classfile_parse_error(
1913 "Invalid Signature attribute length %u in class file %s",
1914 method_attribute_length, CHECK_(nullHandle));
1915 }
1916 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1917 generic_signature_index = cfs->get_u2_fast();
1918 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1919 runtime_visible_annotations_length = method_attribute_length;
1920 runtime_visible_annotations = cfs->get_u1_buffer();
1921 assert(runtime_visible_annotations != NULL, "null visible annotations");
1922 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1923 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1924 runtime_invisible_annotations_length = method_attribute_length;
1925 runtime_invisible_annotations = cfs->get_u1_buffer();
1926 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1927 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1928 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1929 runtime_visible_parameter_annotations_length = method_attribute_length;
1930 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1931 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1932 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1933 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1934 runtime_invisible_parameter_annotations_length = method_attribute_length;
1935 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1936 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1937 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1938 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1939 annotation_default_length = method_attribute_length;
1940 annotation_default = cfs->get_u1_buffer();
1941 assert(annotation_default != NULL, "null annotation default");
1942 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1943 } else {
1944 // Skip unknown attributes
1945 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1946 }
1947 } else {
1948 // Skip unknown attributes
1949 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1950 }
1951 }
1953 if (linenumber_table != NULL) {
1954 linenumber_table->write_terminator();
1955 linenumber_table_length = linenumber_table->position();
1956 }
1958 // Make sure there's at least one Code attribute in non-native/non-abstract method
1959 if (_need_verify) {
1960 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1961 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1962 }
1964 // All sizing information for a methodOop is finally available, now create it
1965 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1966 total_lvt_length, checked_exceptions_length,
1967 oopDesc::IsSafeConc, CHECK_(nullHandle));
1968 methodHandle m (THREAD, m_oop);
1970 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1972 // Fill in information from fixed part (access_flags already set)
1973 m->set_constants(cp());
1974 m->set_name_index(name_index);
1975 m->set_signature_index(signature_index);
1976 m->set_generic_signature_index(generic_signature_index);
1977 #ifdef CC_INTERP
1978 // hmm is there a gc issue here??
1979 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1980 m->set_result_index(rtf.type());
1981 #endif
1983 if (args_size >= 0) {
1984 m->set_size_of_parameters(args_size);
1985 } else {
1986 m->compute_size_of_parameters(THREAD);
1987 }
1988 #ifdef ASSERT
1989 if (args_size >= 0) {
1990 m->compute_size_of_parameters(THREAD);
1991 assert(args_size == m->size_of_parameters(), "");
1992 }
1993 #endif
1995 // Fill in code attribute information
1996 m->set_max_stack(max_stack);
1997 m->set_max_locals(max_locals);
1998 m->constMethod()->set_stackmap_data(stackmap_data());
2000 /**
2001 * The exception_table field is the flag used to indicate
2002 * that the methodOop and it's associated constMethodOop are partially
2003 * initialized and thus are exempt from pre/post GC verification. Once
2004 * the field is set, the oops are considered fully initialized so make
2005 * sure that the oops can pass verification when this field is set.
2006 */
2007 m->set_exception_table(exception_handlers());
2009 // Copy byte codes
2010 m->set_code(code_start);
2012 // Copy line number table
2013 if (linenumber_table != NULL) {
2014 memcpy(m->compressed_linenumber_table(),
2015 linenumber_table->buffer(), linenumber_table_length);
2016 }
2018 // Copy checked exceptions
2019 if (checked_exceptions_length > 0) {
2020 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2021 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2022 }
2024 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2025 *
2026 * Rules for LVT's and LVTT's are:
2027 * - There can be any number of LVT's and LVTT's.
2028 * - If there are n LVT's, it is the same as if there was just
2029 * one LVT containing all the entries from the n LVT's.
2030 * - There may be no more than one LVT entry per local variable.
2031 * Two LVT entries are 'equal' if these fields are the same:
2032 * start_pc, length, name, slot
2033 * - There may be no more than one LVTT entry per each LVT entry.
2034 * Each LVTT entry has to match some LVT entry.
2035 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2036 */
2037 if (total_lvt_length > 0) {
2038 int tbl_no, idx;
2040 promoted_flags->set_has_localvariable_table();
2042 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2043 initialize_hashtable(lvt_Hash);
2045 // To fill LocalVariableTable in
2046 Classfile_LVT_Element* cf_lvt;
2047 LocalVariableTableElement* lvt = m->localvariable_table_start();
2049 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2050 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2051 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2052 copy_lvt_element(&cf_lvt[idx], lvt);
2053 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2054 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2055 && _need_verify
2056 && _major_version >= JAVA_1_5_VERSION ) {
2057 clear_hashtable(lvt_Hash);
2058 classfile_parse_error("Duplicated LocalVariableTable attribute "
2059 "entry for '%s' in class file %s",
2060 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2061 CHECK_(nullHandle));
2062 }
2063 }
2064 }
2066 // To merge LocalVariableTable and LocalVariableTypeTable
2067 Classfile_LVT_Element* cf_lvtt;
2068 LocalVariableTableElement lvtt_elem;
2070 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2071 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2072 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2073 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2074 int index = hash(&lvtt_elem);
2075 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2076 if (entry == NULL) {
2077 if (_need_verify) {
2078 clear_hashtable(lvt_Hash);
2079 classfile_parse_error("LVTT entry for '%s' in class file %s "
2080 "does not match any LVT entry",
2081 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2082 CHECK_(nullHandle));
2083 }
2084 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2085 clear_hashtable(lvt_Hash);
2086 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2087 "entry for '%s' in class file %s",
2088 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2089 CHECK_(nullHandle));
2090 } else {
2091 // to add generic signatures into LocalVariableTable
2092 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2093 }
2094 }
2095 }
2096 clear_hashtable(lvt_Hash);
2097 }
2099 *method_annotations = assemble_annotations(runtime_visible_annotations,
2100 runtime_visible_annotations_length,
2101 runtime_invisible_annotations,
2102 runtime_invisible_annotations_length,
2103 CHECK_(nullHandle));
2104 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2105 runtime_visible_parameter_annotations_length,
2106 runtime_invisible_parameter_annotations,
2107 runtime_invisible_parameter_annotations_length,
2108 CHECK_(nullHandle));
2109 *method_default_annotations = assemble_annotations(annotation_default,
2110 annotation_default_length,
2111 NULL,
2112 0,
2113 CHECK_(nullHandle));
2115 if (name == vmSymbols::finalize_method_name() &&
2116 signature == vmSymbols::void_method_signature()) {
2117 if (m->is_empty_method()) {
2118 _has_empty_finalizer = true;
2119 } else {
2120 _has_finalizer = true;
2121 }
2122 }
2123 if (name == vmSymbols::object_initializer_name() &&
2124 signature == vmSymbols::void_method_signature() &&
2125 m->is_vanilla_constructor()) {
2126 _has_vanilla_constructor = true;
2127 }
2129 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2130 m->is_method_handle_adapter())) {
2131 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2132 "Method handle invokers must be defined internally to the VM", nullHandle);
2133 }
2135 return m;
2136 }
2139 // The promoted_flags parameter is used to pass relevant access_flags
2140 // from the methods back up to the containing klass. These flag values
2141 // are added to klass's access_flags.
2143 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2144 AccessFlags* promoted_flags,
2145 bool* has_final_method,
2146 objArrayOop* methods_annotations_oop,
2147 objArrayOop* methods_parameter_annotations_oop,
2148 objArrayOop* methods_default_annotations_oop,
2149 TRAPS) {
2150 ClassFileStream* cfs = stream();
2151 objArrayHandle nullHandle;
2152 typeArrayHandle method_annotations;
2153 typeArrayHandle method_parameter_annotations;
2154 typeArrayHandle method_default_annotations;
2155 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2156 u2 length = cfs->get_u2_fast();
2157 if (length == 0) {
2158 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2159 } else {
2160 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2161 objArrayHandle methods(THREAD, m);
2162 HandleMark hm(THREAD);
2163 objArrayHandle methods_annotations;
2164 objArrayHandle methods_parameter_annotations;
2165 objArrayHandle methods_default_annotations;
2166 for (int index = 0; index < length; index++) {
2167 methodHandle method = parse_method(cp, is_interface,
2168 promoted_flags,
2169 &method_annotations,
2170 &method_parameter_annotations,
2171 &method_default_annotations,
2172 CHECK_(nullHandle));
2173 if (method->is_final()) {
2174 *has_final_method = true;
2175 }
2176 methods->obj_at_put(index, method());
2177 if (method_annotations.not_null()) {
2178 if (methods_annotations.is_null()) {
2179 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2180 methods_annotations = objArrayHandle(THREAD, md);
2181 }
2182 methods_annotations->obj_at_put(index, method_annotations());
2183 }
2184 if (method_parameter_annotations.not_null()) {
2185 if (methods_parameter_annotations.is_null()) {
2186 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2187 methods_parameter_annotations = objArrayHandle(THREAD, md);
2188 }
2189 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2190 }
2191 if (method_default_annotations.not_null()) {
2192 if (methods_default_annotations.is_null()) {
2193 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2194 methods_default_annotations = objArrayHandle(THREAD, md);
2195 }
2196 methods_default_annotations->obj_at_put(index, method_default_annotations());
2197 }
2198 }
2199 if (_need_verify && length > 1) {
2200 // Check duplicated methods
2201 ResourceMark rm(THREAD);
2202 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2203 THREAD, NameSigHash*, HASH_ROW_SIZE);
2204 initialize_hashtable(names_and_sigs);
2205 bool dup = false;
2206 {
2207 debug_only(No_Safepoint_Verifier nsv;)
2208 for (int i = 0; i < length; i++) {
2209 methodOop m = (methodOop)methods->obj_at(i);
2210 // If no duplicates, add name/signature in hashtable names_and_sigs.
2211 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2212 dup = true;
2213 break;
2214 }
2215 }
2216 }
2217 if (dup) {
2218 classfile_parse_error("Duplicate method name&signature in class file %s",
2219 CHECK_(nullHandle));
2220 }
2221 }
2223 *methods_annotations_oop = methods_annotations();
2224 *methods_parameter_annotations_oop = methods_parameter_annotations();
2225 *methods_default_annotations_oop = methods_default_annotations();
2227 return methods;
2228 }
2229 }
2232 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2233 objArrayHandle methods_annotations,
2234 objArrayHandle methods_parameter_annotations,
2235 objArrayHandle methods_default_annotations,
2236 TRAPS) {
2237 typeArrayHandle nullHandle;
2238 int length = methods()->length();
2239 // If JVMTI original method ordering or sharing is enabled we have to
2240 // remember the original class file ordering.
2241 // We temporarily use the vtable_index field in the methodOop to store the
2242 // class file index, so we can read in after calling qsort.
2243 // Put the method ordering in the shared archive.
2244 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2245 for (int index = 0; index < length; index++) {
2246 methodOop m = methodOop(methods->obj_at(index));
2247 assert(!m->valid_vtable_index(), "vtable index should not be set");
2248 m->set_vtable_index(index);
2249 }
2250 }
2251 // Sort method array by ascending method name (for faster lookups & vtable construction)
2252 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2253 methodOopDesc::sort_methods(methods(),
2254 methods_annotations(),
2255 methods_parameter_annotations(),
2256 methods_default_annotations());
2258 // If JVMTI original method ordering or sharing is enabled construct int
2259 // array remembering the original ordering
2260 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2261 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2262 typeArrayHandle method_ordering(THREAD, new_ordering);
2263 for (int index = 0; index < length; index++) {
2264 methodOop m = methodOop(methods->obj_at(index));
2265 int old_index = m->vtable_index();
2266 assert(old_index >= 0 && old_index < length, "invalid method index");
2267 method_ordering->int_at_put(index, old_index);
2268 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2269 }
2270 return method_ordering;
2271 } else {
2272 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2273 }
2274 }
2277 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2278 ClassFileStream* cfs = stream();
2279 cfs->guarantee_more(2, CHECK); // sourcefile_index
2280 u2 sourcefile_index = cfs->get_u2_fast();
2281 check_property(
2282 valid_cp_range(sourcefile_index, cp->length()) &&
2283 cp->tag_at(sourcefile_index).is_utf8(),
2284 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2285 sourcefile_index, CHECK);
2286 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2287 }
2291 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2292 instanceKlassHandle k,
2293 int length, TRAPS) {
2294 ClassFileStream* cfs = stream();
2295 u1* sde_buffer = cfs->get_u1_buffer();
2296 assert(sde_buffer != NULL, "null sde buffer");
2298 // Don't bother storing it if there is no way to retrieve it
2299 if (JvmtiExport::can_get_source_debug_extension()) {
2300 // Optimistically assume that only 1 byte UTF format is used
2301 // (common case)
2302 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2303 k->set_source_debug_extension(sde_symbol);
2304 // Note that set_source_debug_extension() increments the reference count
2305 // for its copy of the Symbol*, so use a TempNewSymbol here.
2306 }
2307 // Got utf8 string, set stream position forward
2308 cfs->skip_u1(length, CHECK);
2309 }
2312 // Inner classes can be static, private or protected (classic VM does this)
2313 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2315 // Return number of classes in the inner classes attribute table
2316 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2317 ClassFileStream* cfs = stream();
2318 cfs->guarantee_more(2, CHECK_0); // length
2319 u2 length = cfs->get_u2_fast();
2321 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2322 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2323 typeArrayHandle inner_classes(THREAD, ic);
2324 int index = 0;
2325 int cp_size = cp->length();
2326 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2327 for (int n = 0; n < length; n++) {
2328 // Inner class index
2329 u2 inner_class_info_index = cfs->get_u2_fast();
2330 check_property(
2331 inner_class_info_index == 0 ||
2332 (valid_cp_range(inner_class_info_index, cp_size) &&
2333 is_klass_reference(cp, inner_class_info_index)),
2334 "inner_class_info_index %u has bad constant type in class file %s",
2335 inner_class_info_index, CHECK_0);
2336 // Outer class index
2337 u2 outer_class_info_index = cfs->get_u2_fast();
2338 check_property(
2339 outer_class_info_index == 0 ||
2340 (valid_cp_range(outer_class_info_index, cp_size) &&
2341 is_klass_reference(cp, outer_class_info_index)),
2342 "outer_class_info_index %u has bad constant type in class file %s",
2343 outer_class_info_index, CHECK_0);
2344 // Inner class name
2345 u2 inner_name_index = cfs->get_u2_fast();
2346 check_property(
2347 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2348 cp->tag_at(inner_name_index).is_utf8()),
2349 "inner_name_index %u has bad constant type in class file %s",
2350 inner_name_index, CHECK_0);
2351 if (_need_verify) {
2352 guarantee_property(inner_class_info_index != outer_class_info_index,
2353 "Class is both outer and inner class in class file %s", CHECK_0);
2354 }
2355 // Access flags
2356 AccessFlags inner_access_flags;
2357 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2358 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2359 // Set abstract bit for old class files for backward compatibility
2360 flags |= JVM_ACC_ABSTRACT;
2361 }
2362 verify_legal_class_modifiers(flags, CHECK_0);
2363 inner_access_flags.set_flags(flags);
2365 inner_classes->short_at_put(index++, inner_class_info_index);
2366 inner_classes->short_at_put(index++, outer_class_info_index);
2367 inner_classes->short_at_put(index++, inner_name_index);
2368 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2369 }
2371 // 4347400: make sure there's no duplicate entry in the classes array
2372 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2373 for(int i = 0; i < inner_classes->length(); i += 4) {
2374 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2375 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2376 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2377 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2378 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2379 "Duplicate entry in InnerClasses in class file %s",
2380 CHECK_0);
2381 }
2382 }
2383 }
2385 // Update instanceKlass with inner class info.
2386 k->set_inner_classes(inner_classes());
2387 return length;
2388 }
2390 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2391 k->set_is_synthetic();
2392 }
2394 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2395 ClassFileStream* cfs = stream();
2396 u2 signature_index = cfs->get_u2(CHECK);
2397 check_property(
2398 valid_cp_range(signature_index, cp->length()) &&
2399 cp->tag_at(signature_index).is_utf8(),
2400 "Invalid constant pool index %u in Signature attribute in class file %s",
2401 signature_index, CHECK);
2402 k->set_generic_signature(cp->symbol_at(signature_index));
2403 }
2405 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2406 u4 attribute_byte_length, TRAPS) {
2407 ClassFileStream* cfs = stream();
2408 u1* current_start = cfs->current();
2410 cfs->guarantee_more(2, CHECK); // length
2411 int attribute_array_length = cfs->get_u2_fast();
2413 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2414 "Short length on BootstrapMethods in class file %s",
2415 CHECK);
2417 // The attribute contains a counted array of counted tuples of shorts,
2418 // represending bootstrap specifiers:
2419 // length*{bootstrap_method_index, argument_count*{argument_index}}
2420 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2421 // operand_count = number of shorts in attr, except for leading length
2423 // The attribute is copied into a short[] array.
2424 // The array begins with a series of short[2] pairs, one for each tuple.
2425 int index_size = (attribute_array_length * 2);
2427 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2428 typeArrayHandle operands(THREAD, operands_oop);
2429 operands_oop = NULL; // tidy
2431 int operand_fill_index = index_size;
2432 int cp_size = cp->length();
2434 for (int n = 0; n < attribute_array_length; n++) {
2435 // Store a 32-bit offset into the header of the operand array.
2436 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2437 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2439 // Read a bootstrap specifier.
2440 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2441 u2 bootstrap_method_index = cfs->get_u2_fast();
2442 u2 argument_count = cfs->get_u2_fast();
2443 check_property(
2444 valid_cp_range(bootstrap_method_index, cp_size) &&
2445 cp->tag_at(bootstrap_method_index).is_method_handle(),
2446 "bootstrap_method_index %u has bad constant type in class file %s",
2447 bootstrap_method_index,
2448 CHECK);
2449 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2450 operands->short_at_put(operand_fill_index++, argument_count);
2452 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2453 for (int j = 0; j < argument_count; j++) {
2454 u2 argument_index = cfs->get_u2_fast();
2455 check_property(
2456 valid_cp_range(argument_index, cp_size) &&
2457 cp->tag_at(argument_index).is_loadable_constant(),
2458 "argument_index %u has bad constant type in class file %s",
2459 argument_index,
2460 CHECK);
2461 operands->short_at_put(operand_fill_index++, argument_index);
2462 }
2463 }
2465 assert(operand_fill_index == operands()->length(), "exact fill");
2466 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2468 u1* current_end = cfs->current();
2469 guarantee_property(current_end == current_start + attribute_byte_length,
2470 "Bad length on BootstrapMethods in class file %s",
2471 CHECK);
2473 cp->set_operands(operands());
2474 }
2477 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2478 ClassFileStream* cfs = stream();
2479 // Set inner classes attribute to default sentinel
2480 k->set_inner_classes(Universe::the_empty_short_array());
2481 cfs->guarantee_more(2, CHECK); // attributes_count
2482 u2 attributes_count = cfs->get_u2_fast();
2483 bool parsed_sourcefile_attribute = false;
2484 bool parsed_innerclasses_attribute = false;
2485 bool parsed_enclosingmethod_attribute = false;
2486 bool parsed_bootstrap_methods_attribute = false;
2487 u1* runtime_visible_annotations = NULL;
2488 int runtime_visible_annotations_length = 0;
2489 u1* runtime_invisible_annotations = NULL;
2490 int runtime_invisible_annotations_length = 0;
2491 // Iterate over attributes
2492 while (attributes_count--) {
2493 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2494 u2 attribute_name_index = cfs->get_u2_fast();
2495 u4 attribute_length = cfs->get_u4_fast();
2496 check_property(
2497 valid_cp_range(attribute_name_index, cp->length()) &&
2498 cp->tag_at(attribute_name_index).is_utf8(),
2499 "Attribute name has bad constant pool index %u in class file %s",
2500 attribute_name_index, CHECK);
2501 Symbol* tag = cp->symbol_at(attribute_name_index);
2502 if (tag == vmSymbols::tag_source_file()) {
2503 // Check for SourceFile tag
2504 if (_need_verify) {
2505 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2506 }
2507 if (parsed_sourcefile_attribute) {
2508 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2509 } else {
2510 parsed_sourcefile_attribute = true;
2511 }
2512 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2513 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2514 // Check for SourceDebugExtension tag
2515 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2516 } else if (tag == vmSymbols::tag_inner_classes()) {
2517 // Check for InnerClasses tag
2518 if (parsed_innerclasses_attribute) {
2519 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2520 } else {
2521 parsed_innerclasses_attribute = true;
2522 }
2523 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2524 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2525 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2526 "Wrong InnerClasses attribute length in class file %s", CHECK);
2527 }
2528 } else if (tag == vmSymbols::tag_synthetic()) {
2529 // Check for Synthetic tag
2530 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2531 if (attribute_length != 0) {
2532 classfile_parse_error(
2533 "Invalid Synthetic classfile attribute length %u in class file %s",
2534 attribute_length, CHECK);
2535 }
2536 parse_classfile_synthetic_attribute(cp, k, CHECK);
2537 } else if (tag == vmSymbols::tag_deprecated()) {
2538 // Check for Deprecatd tag - 4276120
2539 if (attribute_length != 0) {
2540 classfile_parse_error(
2541 "Invalid Deprecated classfile attribute length %u in class file %s",
2542 attribute_length, CHECK);
2543 }
2544 } else if (_major_version >= JAVA_1_5_VERSION) {
2545 if (tag == vmSymbols::tag_signature()) {
2546 if (attribute_length != 2) {
2547 classfile_parse_error(
2548 "Wrong Signature attribute length %u in class file %s",
2549 attribute_length, CHECK);
2550 }
2551 parse_classfile_signature_attribute(cp, k, CHECK);
2552 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2553 runtime_visible_annotations_length = attribute_length;
2554 runtime_visible_annotations = cfs->get_u1_buffer();
2555 assert(runtime_visible_annotations != NULL, "null visible annotations");
2556 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2557 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2558 runtime_invisible_annotations_length = attribute_length;
2559 runtime_invisible_annotations = cfs->get_u1_buffer();
2560 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2561 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2562 } else if (tag == vmSymbols::tag_enclosing_method()) {
2563 if (parsed_enclosingmethod_attribute) {
2564 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2565 } else {
2566 parsed_enclosingmethod_attribute = true;
2567 }
2568 cfs->guarantee_more(4, CHECK); // class_index, method_index
2569 u2 class_index = cfs->get_u2_fast();
2570 u2 method_index = cfs->get_u2_fast();
2571 if (class_index == 0) {
2572 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2573 }
2574 // Validate the constant pool indices and types
2575 if (!cp->is_within_bounds(class_index) ||
2576 !is_klass_reference(cp, class_index)) {
2577 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2578 }
2579 if (method_index != 0 &&
2580 (!cp->is_within_bounds(method_index) ||
2581 !cp->tag_at(method_index).is_name_and_type())) {
2582 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2583 }
2584 k->set_enclosing_method_indices(class_index, method_index);
2585 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2586 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2587 if (parsed_bootstrap_methods_attribute)
2588 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2589 parsed_bootstrap_methods_attribute = true;
2590 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2591 } else {
2592 // Unknown attribute
2593 cfs->skip_u1(attribute_length, CHECK);
2594 }
2595 } else {
2596 // Unknown attribute
2597 cfs->skip_u1(attribute_length, CHECK);
2598 }
2599 }
2600 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2601 runtime_visible_annotations_length,
2602 runtime_invisible_annotations,
2603 runtime_invisible_annotations_length,
2604 CHECK);
2605 k->set_class_annotations(annotations());
2607 if (_max_bootstrap_specifier_index >= 0) {
2608 guarantee_property(parsed_bootstrap_methods_attribute,
2609 "Missing BootstrapMethods attribute in class file %s", CHECK);
2610 }
2611 }
2614 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2615 int runtime_visible_annotations_length,
2616 u1* runtime_invisible_annotations,
2617 int runtime_invisible_annotations_length, TRAPS) {
2618 typeArrayHandle annotations;
2619 if (runtime_visible_annotations != NULL ||
2620 runtime_invisible_annotations != NULL) {
2621 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2622 runtime_invisible_annotations_length, CHECK_(annotations));
2623 annotations = typeArrayHandle(THREAD, anno);
2624 if (runtime_visible_annotations != NULL) {
2625 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2626 }
2627 if (runtime_invisible_annotations != NULL) {
2628 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2629 }
2630 }
2631 return annotations;
2632 }
2635 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2636 Handle class_loader,
2637 Handle protection_domain,
2638 KlassHandle host_klass,
2639 GrowableArray<Handle>* cp_patches,
2640 TempNewSymbol& parsed_name,
2641 bool verify,
2642 TRAPS) {
2643 // When a retransformable agent is attached, JVMTI caches the
2644 // class bytes that existed before the first retransformation.
2645 // If RedefineClasses() was used before the retransformable
2646 // agent attached, then the cached class bytes may not be the
2647 // original class bytes.
2648 unsigned char *cached_class_file_bytes = NULL;
2649 jint cached_class_file_length;
2651 ClassFileStream* cfs = stream();
2652 // Timing
2653 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2654 JavaThread* jt = (JavaThread*) THREAD;
2656 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2657 ClassLoader::perf_class_parse_selftime(),
2658 NULL,
2659 jt->get_thread_stat()->perf_recursion_counts_addr(),
2660 jt->get_thread_stat()->perf_timers_addr(),
2661 PerfClassTraceTime::PARSE_CLASS);
2663 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2664 _max_bootstrap_specifier_index = -1;
2666 if (JvmtiExport::should_post_class_file_load_hook()) {
2667 // Get the cached class file bytes (if any) from the
2668 // class that is being redefined.
2669 JvmtiThreadState *state = JvmtiThreadState::state_for(jt);
2670 KlassHandle *h_class_being_redefined =
2671 state->get_class_being_redefined();
2672 if (h_class_being_redefined != NULL) {
2673 instanceKlassHandle ikh_class_being_redefined =
2674 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
2675 cached_class_file_bytes =
2676 ikh_class_being_redefined->get_cached_class_file_bytes();
2677 cached_class_file_length =
2678 ikh_class_being_redefined->get_cached_class_file_len();
2679 }
2681 unsigned char* ptr = cfs->buffer();
2682 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2684 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2685 &ptr, &end_ptr,
2686 &cached_class_file_bytes,
2687 &cached_class_file_length);
2689 if (ptr != cfs->buffer()) {
2690 // JVMTI agent has modified class file data.
2691 // Set new class file stream using JVMTI agent modified
2692 // class file data.
2693 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2694 set_stream(cfs);
2695 }
2696 }
2698 _host_klass = host_klass;
2699 _cp_patches = cp_patches;
2701 instanceKlassHandle nullHandle;
2703 // Figure out whether we can skip format checking (matching classic VM behavior)
2704 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2706 // Set the verify flag in stream
2707 cfs->set_verify(_need_verify);
2709 // Save the class file name for easier error message printing.
2710 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2712 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2713 // Magic value
2714 u4 magic = cfs->get_u4_fast();
2715 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2716 "Incompatible magic value %u in class file %s",
2717 magic, CHECK_(nullHandle));
2719 // Version numbers
2720 u2 minor_version = cfs->get_u2_fast();
2721 u2 major_version = cfs->get_u2_fast();
2723 // Check version numbers - we check this even with verifier off
2724 if (!is_supported_version(major_version, minor_version)) {
2725 if (name == NULL) {
2726 Exceptions::fthrow(
2727 THREAD_AND_LOCATION,
2728 vmSymbols::java_lang_UnsupportedClassVersionError(),
2729 "Unsupported major.minor version %u.%u",
2730 major_version,
2731 minor_version);
2732 } else {
2733 ResourceMark rm(THREAD);
2734 Exceptions::fthrow(
2735 THREAD_AND_LOCATION,
2736 vmSymbols::java_lang_UnsupportedClassVersionError(),
2737 "%s : Unsupported major.minor version %u.%u",
2738 name->as_C_string(),
2739 major_version,
2740 minor_version);
2741 }
2742 return nullHandle;
2743 }
2745 _major_version = major_version;
2746 _minor_version = minor_version;
2749 // Check if verification needs to be relaxed for this class file
2750 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2751 _relax_verify = Verifier::relax_verify_for(class_loader());
2753 // Constant pool
2754 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2755 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2757 int cp_size = cp->length();
2759 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2761 // Access flags
2762 AccessFlags access_flags;
2763 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2765 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2766 // Set abstract bit for old class files for backward compatibility
2767 flags |= JVM_ACC_ABSTRACT;
2768 }
2769 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2770 access_flags.set_flags(flags);
2772 // This class and superclass
2773 instanceKlassHandle super_klass;
2774 u2 this_class_index = cfs->get_u2_fast();
2775 check_property(
2776 valid_cp_range(this_class_index, cp_size) &&
2777 cp->tag_at(this_class_index).is_unresolved_klass(),
2778 "Invalid this class index %u in constant pool in class file %s",
2779 this_class_index, CHECK_(nullHandle));
2781 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2782 assert(class_name != NULL, "class_name can't be null");
2784 // It's important to set parsed_name *before* resolving the super class.
2785 // (it's used for cleanup by the caller if parsing fails)
2786 parsed_name = class_name;
2787 // parsed_name is returned and can be used if there's an error, so add to
2788 // its reference count. Caller will decrement the refcount.
2789 parsed_name->increment_refcount();
2791 // Update _class_name which could be null previously to be class_name
2792 _class_name = class_name;
2794 // Don't need to check whether this class name is legal or not.
2795 // It has been checked when constant pool is parsed.
2796 // However, make sure it is not an array type.
2797 if (_need_verify) {
2798 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2799 "Bad class name in class file %s",
2800 CHECK_(nullHandle));
2801 }
2803 klassOop preserve_this_klass; // for storing result across HandleMark
2805 // release all handles when parsing is done
2806 { HandleMark hm(THREAD);
2808 // Checks if name in class file matches requested name
2809 if (name != NULL && class_name != name) {
2810 ResourceMark rm(THREAD);
2811 Exceptions::fthrow(
2812 THREAD_AND_LOCATION,
2813 vmSymbols::java_lang_NoClassDefFoundError(),
2814 "%s (wrong name: %s)",
2815 name->as_C_string(),
2816 class_name->as_C_string()
2817 );
2818 return nullHandle;
2819 }
2821 if (TraceClassLoadingPreorder) {
2822 tty->print("[Loading %s", name->as_klass_external_name());
2823 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2824 tty->print_cr("]");
2825 }
2827 u2 super_class_index = cfs->get_u2_fast();
2828 if (super_class_index == 0) {
2829 check_property(class_name == vmSymbols::java_lang_Object(),
2830 "Invalid superclass index %u in class file %s",
2831 super_class_index,
2832 CHECK_(nullHandle));
2833 } else {
2834 check_property(valid_cp_range(super_class_index, cp_size) &&
2835 is_klass_reference(cp, super_class_index),
2836 "Invalid superclass index %u in class file %s",
2837 super_class_index,
2838 CHECK_(nullHandle));
2839 // The class name should be legal because it is checked when parsing constant pool.
2840 // However, make sure it is not an array type.
2841 bool is_array = false;
2842 if (cp->tag_at(super_class_index).is_klass()) {
2843 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2844 if (_need_verify)
2845 is_array = super_klass->oop_is_array();
2846 } else if (_need_verify) {
2847 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2848 }
2849 if (_need_verify) {
2850 guarantee_property(!is_array,
2851 "Bad superclass name in class file %s", CHECK_(nullHandle));
2852 }
2853 }
2855 // Interfaces
2856 u2 itfs_len = cfs->get_u2_fast();
2857 objArrayHandle local_interfaces;
2858 if (itfs_len == 0) {
2859 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2860 } else {
2861 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2862 }
2864 int java_fields_count = 0;
2865 // Fields (offsets are filled in later)
2866 FieldAllocationCount fac;
2867 objArrayHandle fields_annotations;
2868 typeArrayHandle fields = parse_fields(class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
2869 &java_fields_count,
2870 CHECK_(nullHandle));
2871 // Methods
2872 bool has_final_method = false;
2873 AccessFlags promoted_flags;
2874 promoted_flags.set_flags(0);
2875 // These need to be oop pointers because they are allocated lazily
2876 // inside parse_methods inside a nested HandleMark
2877 objArrayOop methods_annotations_oop = NULL;
2878 objArrayOop methods_parameter_annotations_oop = NULL;
2879 objArrayOop methods_default_annotations_oop = NULL;
2880 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2881 &promoted_flags,
2882 &has_final_method,
2883 &methods_annotations_oop,
2884 &methods_parameter_annotations_oop,
2885 &methods_default_annotations_oop,
2886 CHECK_(nullHandle));
2888 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2889 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2890 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2892 // We check super class after class file is parsed and format is checked
2893 if (super_class_index > 0 && super_klass.is_null()) {
2894 Symbol* sk = cp->klass_name_at(super_class_index);
2895 if (access_flags.is_interface()) {
2896 // Before attempting to resolve the superclass, check for class format
2897 // errors not checked yet.
2898 guarantee_property(sk == vmSymbols::java_lang_Object(),
2899 "Interfaces must have java.lang.Object as superclass in class file %s",
2900 CHECK_(nullHandle));
2901 }
2902 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2903 sk,
2904 class_loader,
2905 protection_domain,
2906 true,
2907 CHECK_(nullHandle));
2909 KlassHandle kh (THREAD, k);
2910 super_klass = instanceKlassHandle(THREAD, kh());
2911 if (LinkWellKnownClasses) // my super class is well known to me
2912 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2913 }
2914 if (super_klass.not_null()) {
2915 if (super_klass->is_interface()) {
2916 ResourceMark rm(THREAD);
2917 Exceptions::fthrow(
2918 THREAD_AND_LOCATION,
2919 vmSymbols::java_lang_IncompatibleClassChangeError(),
2920 "class %s has interface %s as super class",
2921 class_name->as_klass_external_name(),
2922 super_klass->external_name()
2923 );
2924 return nullHandle;
2925 }
2926 // Make sure super class is not final
2927 if (super_klass->is_final()) {
2928 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2929 }
2930 }
2932 // Compute the transitive list of all unique interfaces implemented by this class
2933 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2935 // sort methods
2936 typeArrayHandle method_ordering = sort_methods(methods,
2937 methods_annotations,
2938 methods_parameter_annotations,
2939 methods_default_annotations,
2940 CHECK_(nullHandle));
2942 // promote flags from parse_methods() to the klass' flags
2943 access_flags.add_promoted_flags(promoted_flags.as_int());
2945 // Size of Java vtable (in words)
2946 int vtable_size = 0;
2947 int itable_size = 0;
2948 int num_miranda_methods = 0;
2950 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2951 num_miranda_methods,
2952 super_klass(),
2953 methods(),
2954 access_flags,
2955 class_loader,
2956 class_name,
2957 local_interfaces(),
2958 CHECK_(nullHandle));
2960 // Size of Java itable (in words)
2961 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2963 // Field size and offset computation
2964 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2965 #ifndef PRODUCT
2966 int orig_nonstatic_field_size = 0;
2967 #endif
2968 int static_field_size = 0;
2969 int next_static_oop_offset;
2970 int next_static_double_offset;
2971 int next_static_word_offset;
2972 int next_static_short_offset;
2973 int next_static_byte_offset;
2974 int next_static_type_offset;
2975 int next_nonstatic_oop_offset;
2976 int next_nonstatic_double_offset;
2977 int next_nonstatic_word_offset;
2978 int next_nonstatic_short_offset;
2979 int next_nonstatic_byte_offset;
2980 int next_nonstatic_type_offset;
2981 int first_nonstatic_oop_offset;
2982 int first_nonstatic_field_offset;
2983 int next_nonstatic_field_offset;
2985 // Calculate the starting byte offsets
2986 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
2987 next_static_double_offset = next_static_oop_offset +
2988 (fac.count[STATIC_OOP] * heapOopSize);
2989 if ( fac.count[STATIC_DOUBLE] &&
2990 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2991 Universe::field_type_should_be_aligned(T_LONG)) ) {
2992 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2993 }
2995 next_static_word_offset = next_static_double_offset +
2996 (fac.count[STATIC_DOUBLE] * BytesPerLong);
2997 next_static_short_offset = next_static_word_offset +
2998 (fac.count[STATIC_WORD] * BytesPerInt);
2999 next_static_byte_offset = next_static_short_offset +
3000 (fac.count[STATIC_SHORT] * BytesPerShort);
3001 next_static_type_offset = align_size_up((next_static_byte_offset +
3002 fac.count[STATIC_BYTE] ), wordSize );
3003 static_field_size = (next_static_type_offset -
3004 next_static_oop_offset) / wordSize;
3006 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3007 nonstatic_field_size * heapOopSize;
3008 next_nonstatic_field_offset = first_nonstatic_field_offset;
3010 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE];
3011 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD];
3012 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT];
3013 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE];
3014 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP];
3016 bool super_has_nonstatic_fields =
3017 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3018 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3019 ((nonstatic_double_count + nonstatic_word_count +
3020 nonstatic_short_count + nonstatic_byte_count +
3021 nonstatic_oop_count) != 0);
3024 // Prepare list of oops for oop map generation.
3025 int* nonstatic_oop_offsets;
3026 unsigned int* nonstatic_oop_counts;
3027 unsigned int nonstatic_oop_map_count = 0;
3029 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3030 THREAD, int, nonstatic_oop_count + 1);
3031 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3032 THREAD, unsigned int, nonstatic_oop_count + 1);
3034 first_nonstatic_oop_offset = 0; // will be set for first oop field
3036 #ifndef PRODUCT
3037 if( PrintCompactFieldsSavings ) {
3038 next_nonstatic_double_offset = next_nonstatic_field_offset +
3039 (nonstatic_oop_count * heapOopSize);
3040 if ( nonstatic_double_count > 0 ) {
3041 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3042 }
3043 next_nonstatic_word_offset = next_nonstatic_double_offset +
3044 (nonstatic_double_count * BytesPerLong);
3045 next_nonstatic_short_offset = next_nonstatic_word_offset +
3046 (nonstatic_word_count * BytesPerInt);
3047 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3048 (nonstatic_short_count * BytesPerShort);
3049 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3050 nonstatic_byte_count ), heapOopSize );
3051 orig_nonstatic_field_size = nonstatic_field_size +
3052 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3053 }
3054 #endif
3055 bool compact_fields = CompactFields;
3056 int allocation_style = FieldsAllocationStyle;
3057 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3058 assert(false, "0 <= FieldsAllocationStyle <= 2");
3059 allocation_style = 1; // Optimistic
3060 }
3062 // The next classes have predefined hard-coded fields offsets
3063 // (see in JavaClasses::compute_hard_coded_offsets()).
3064 // Use default fields allocation order for them.
3065 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3066 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3067 class_name == vmSymbols::java_lang_Class() ||
3068 class_name == vmSymbols::java_lang_ClassLoader() ||
3069 class_name == vmSymbols::java_lang_ref_Reference() ||
3070 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3071 class_name == vmSymbols::java_lang_StackTraceElement() ||
3072 class_name == vmSymbols::java_lang_String() ||
3073 class_name == vmSymbols::java_lang_Throwable() ||
3074 class_name == vmSymbols::java_lang_Boolean() ||
3075 class_name == vmSymbols::java_lang_Character() ||
3076 class_name == vmSymbols::java_lang_Float() ||
3077 class_name == vmSymbols::java_lang_Double() ||
3078 class_name == vmSymbols::java_lang_Byte() ||
3079 class_name == vmSymbols::java_lang_Short() ||
3080 class_name == vmSymbols::java_lang_Integer() ||
3081 class_name == vmSymbols::java_lang_Long())) {
3082 allocation_style = 0; // Allocate oops first
3083 compact_fields = false; // Don't compact fields
3084 }
3086 if( allocation_style == 0 ) {
3087 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3088 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3089 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3090 (nonstatic_oop_count * heapOopSize);
3091 } else if( allocation_style == 1 ) {
3092 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3093 next_nonstatic_double_offset = next_nonstatic_field_offset;
3094 } else if( allocation_style == 2 ) {
3095 // Fields allocation: oops fields in super and sub classes are together.
3096 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3097 super_klass->nonstatic_oop_map_size() > 0 ) {
3098 int map_count = super_klass->nonstatic_oop_map_count();
3099 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3100 OopMapBlock* last_map = first_map + map_count - 1;
3101 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3102 if (next_offset == next_nonstatic_field_offset) {
3103 allocation_style = 0; // allocate oops first
3104 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3105 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3106 (nonstatic_oop_count * heapOopSize);
3107 }
3108 }
3109 if( allocation_style == 2 ) {
3110 allocation_style = 1; // allocate oops last
3111 next_nonstatic_double_offset = next_nonstatic_field_offset;
3112 }
3113 } else {
3114 ShouldNotReachHere();
3115 }
3117 int nonstatic_oop_space_count = 0;
3118 int nonstatic_word_space_count = 0;
3119 int nonstatic_short_space_count = 0;
3120 int nonstatic_byte_space_count = 0;
3121 int nonstatic_oop_space_offset;
3122 int nonstatic_word_space_offset;
3123 int nonstatic_short_space_offset;
3124 int nonstatic_byte_space_offset;
3126 if( nonstatic_double_count > 0 ) {
3127 int offset = next_nonstatic_double_offset;
3128 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3129 if( compact_fields && offset != next_nonstatic_double_offset ) {
3130 // Allocate available fields into the gap before double field.
3131 int length = next_nonstatic_double_offset - offset;
3132 assert(length == BytesPerInt, "");
3133 nonstatic_word_space_offset = offset;
3134 if( nonstatic_word_count > 0 ) {
3135 nonstatic_word_count -= 1;
3136 nonstatic_word_space_count = 1; // Only one will fit
3137 length -= BytesPerInt;
3138 offset += BytesPerInt;
3139 }
3140 nonstatic_short_space_offset = offset;
3141 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3142 nonstatic_short_count -= 1;
3143 nonstatic_short_space_count += 1;
3144 length -= BytesPerShort;
3145 offset += BytesPerShort;
3146 }
3147 nonstatic_byte_space_offset = offset;
3148 while( length > 0 && nonstatic_byte_count > 0 ) {
3149 nonstatic_byte_count -= 1;
3150 nonstatic_byte_space_count += 1;
3151 length -= 1;
3152 }
3153 // Allocate oop field in the gap if there are no other fields for that.
3154 nonstatic_oop_space_offset = offset;
3155 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3156 allocation_style != 0 ) { // when oop fields not first
3157 nonstatic_oop_count -= 1;
3158 nonstatic_oop_space_count = 1; // Only one will fit
3159 length -= heapOopSize;
3160 offset += heapOopSize;
3161 }
3162 }
3163 }
3165 next_nonstatic_word_offset = next_nonstatic_double_offset +
3166 (nonstatic_double_count * BytesPerLong);
3167 next_nonstatic_short_offset = next_nonstatic_word_offset +
3168 (nonstatic_word_count * BytesPerInt);
3169 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3170 (nonstatic_short_count * BytesPerShort);
3172 int notaligned_offset;
3173 if( allocation_style == 0 ) {
3174 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3175 } else { // allocation_style == 1
3176 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3177 if( nonstatic_oop_count > 0 ) {
3178 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3179 }
3180 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3181 }
3182 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3183 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3184 - first_nonstatic_field_offset)/heapOopSize);
3186 // Iterate over fields again and compute correct offsets.
3187 // The field allocation type was temporarily stored in the offset slot.
3188 // oop fields are located before non-oop fields (static and non-static).
3189 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3190 int real_offset;
3191 FieldAllocationType atype = (FieldAllocationType) fs.offset();
3192 switch (atype) {
3193 case STATIC_OOP:
3194 real_offset = next_static_oop_offset;
3195 next_static_oop_offset += heapOopSize;
3196 break;
3197 case STATIC_BYTE:
3198 real_offset = next_static_byte_offset;
3199 next_static_byte_offset += 1;
3200 break;
3201 case STATIC_SHORT:
3202 real_offset = next_static_short_offset;
3203 next_static_short_offset += BytesPerShort;
3204 break;
3205 case STATIC_WORD:
3206 real_offset = next_static_word_offset;
3207 next_static_word_offset += BytesPerInt;
3208 break;
3209 case STATIC_DOUBLE:
3210 real_offset = next_static_double_offset;
3211 next_static_double_offset += BytesPerLong;
3212 break;
3213 case NONSTATIC_OOP:
3214 if( nonstatic_oop_space_count > 0 ) {
3215 real_offset = nonstatic_oop_space_offset;
3216 nonstatic_oop_space_offset += heapOopSize;
3217 nonstatic_oop_space_count -= 1;
3218 } else {
3219 real_offset = next_nonstatic_oop_offset;
3220 next_nonstatic_oop_offset += heapOopSize;
3221 }
3222 // Update oop maps
3223 if( nonstatic_oop_map_count > 0 &&
3224 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3225 real_offset -
3226 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3227 heapOopSize ) {
3228 // Extend current oop map
3229 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3230 } else {
3231 // Create new oop map
3232 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3233 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3234 nonstatic_oop_map_count += 1;
3235 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3236 first_nonstatic_oop_offset = real_offset;
3237 }
3238 }
3239 break;
3240 case NONSTATIC_BYTE:
3241 if( nonstatic_byte_space_count > 0 ) {
3242 real_offset = nonstatic_byte_space_offset;
3243 nonstatic_byte_space_offset += 1;
3244 nonstatic_byte_space_count -= 1;
3245 } else {
3246 real_offset = next_nonstatic_byte_offset;
3247 next_nonstatic_byte_offset += 1;
3248 }
3249 break;
3250 case NONSTATIC_SHORT:
3251 if( nonstatic_short_space_count > 0 ) {
3252 real_offset = nonstatic_short_space_offset;
3253 nonstatic_short_space_offset += BytesPerShort;
3254 nonstatic_short_space_count -= 1;
3255 } else {
3256 real_offset = next_nonstatic_short_offset;
3257 next_nonstatic_short_offset += BytesPerShort;
3258 }
3259 break;
3260 case NONSTATIC_WORD:
3261 if( nonstatic_word_space_count > 0 ) {
3262 real_offset = nonstatic_word_space_offset;
3263 nonstatic_word_space_offset += BytesPerInt;
3264 nonstatic_word_space_count -= 1;
3265 } else {
3266 real_offset = next_nonstatic_word_offset;
3267 next_nonstatic_word_offset += BytesPerInt;
3268 }
3269 break;
3270 case NONSTATIC_DOUBLE:
3271 real_offset = next_nonstatic_double_offset;
3272 next_nonstatic_double_offset += BytesPerLong;
3273 break;
3274 default:
3275 ShouldNotReachHere();
3276 }
3277 fs.set_offset(real_offset);
3278 }
3280 // Size of instances
3281 int instance_size;
3283 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3284 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3286 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3288 // Number of non-static oop map blocks allocated at end of klass.
3289 const unsigned int total_oop_map_count =
3290 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3291 first_nonstatic_oop_offset);
3293 // Compute reference type
3294 ReferenceType rt;
3295 if (super_klass() == NULL) {
3296 rt = REF_NONE;
3297 } else {
3298 rt = super_klass->reference_type();
3299 }
3301 // We can now create the basic klassOop for this klass
3302 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3303 static_field_size,
3304 total_oop_map_count,
3305 rt, CHECK_(nullHandle));
3306 instanceKlassHandle this_klass (THREAD, ik);
3308 assert(this_klass->static_field_size() == static_field_size, "sanity");
3309 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3310 "sanity");
3312 // Fill in information already parsed
3313 this_klass->set_access_flags(access_flags);
3314 this_klass->set_should_verify_class(verify);
3315 jint lh = Klass::instance_layout_helper(instance_size, false);
3316 this_klass->set_layout_helper(lh);
3317 assert(this_klass->oop_is_instance(), "layout is correct");
3318 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3319 // Not yet: supers are done below to support the new subtype-checking fields
3320 //this_klass->set_super(super_klass());
3321 this_klass->set_class_loader(class_loader());
3322 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3323 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3324 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3325 cp->set_pool_holder(this_klass());
3326 error_handler.set_in_error(false); // turn off error handler for cp
3327 this_klass->set_constants(cp());
3328 this_klass->set_local_interfaces(local_interfaces());
3329 this_klass->set_fields(fields(), java_fields_count);
3330 this_klass->set_methods(methods());
3331 if (has_final_method) {
3332 this_klass->set_has_final_method();
3333 }
3334 this_klass->set_method_ordering(method_ordering());
3335 // The instanceKlass::_methods_jmethod_ids cache and the
3336 // instanceKlass::_methods_cached_itable_indices cache are
3337 // both managed on the assumption that the initial cache
3338 // size is equal to the number of methods in the class. If
3339 // that changes, then instanceKlass::idnum_can_increment()
3340 // has to be changed accordingly.
3341 this_klass->set_initial_method_idnum(methods->length());
3342 this_klass->set_name(cp->klass_name_at(this_class_index));
3343 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3344 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3345 this_klass->set_protection_domain(protection_domain());
3346 this_klass->set_fields_annotations(fields_annotations());
3347 this_klass->set_methods_annotations(methods_annotations());
3348 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3349 this_klass->set_methods_default_annotations(methods_default_annotations());
3351 this_klass->set_minor_version(minor_version);
3352 this_klass->set_major_version(major_version);
3354 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3355 // (We used to do this lazily, but now we query it in Rewriter,
3356 // which is eagerly done for every method, so we might as well do it now,
3357 // when everything is fresh in memory.)
3358 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3359 for (int j = 0; j < methods->length(); j++) {
3360 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3361 }
3362 }
3364 if (cached_class_file_bytes != NULL) {
3365 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3366 this_klass->set_cached_class_file(cached_class_file_bytes,
3367 cached_class_file_length);
3368 }
3370 // Miranda methods
3371 if ((num_miranda_methods > 0) ||
3372 // if this class introduced new miranda methods or
3373 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3374 // super class exists and this class inherited miranda methods
3375 ) {
3376 this_klass->set_has_miranda_methods(); // then set a flag
3377 }
3379 // Additional attributes
3380 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3382 // Make sure this is the end of class file stream
3383 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3385 // VerifyOops believes that once this has been set, the object is completely loaded.
3386 // Compute transitive closure of interfaces this class implements
3387 this_klass->set_transitive_interfaces(transitive_interfaces());
3389 // Fill in information needed to compute superclasses.
3390 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3392 // Initialize itable offset tables
3393 klassItable::setup_itable_offset_table(this_klass);
3395 // Do final class setup
3396 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3398 set_precomputed_flags(this_klass);
3400 // reinitialize modifiers, using the InnerClasses attribute
3401 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3402 this_klass->set_modifier_flags(computed_modifiers);
3404 // check if this class can access its super class
3405 check_super_class_access(this_klass, CHECK_(nullHandle));
3407 // check if this class can access its superinterfaces
3408 check_super_interface_access(this_klass, CHECK_(nullHandle));
3410 // check if this class overrides any final method
3411 check_final_method_override(this_klass, CHECK_(nullHandle));
3413 // check that if this class is an interface then it doesn't have static methods
3414 if (this_klass->is_interface()) {
3415 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3416 }
3418 // Allocate mirror and initialize static fields
3419 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3421 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3422 false /* not shared class */);
3424 if (TraceClassLoading) {
3425 // print in a single call to reduce interleaving of output
3426 if (cfs->source() != NULL) {
3427 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3428 cfs->source());
3429 } else if (class_loader.is_null()) {
3430 if (THREAD->is_Java_thread()) {
3431 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3432 tty->print("[Loaded %s by instance of %s]\n",
3433 this_klass->external_name(),
3434 instanceKlass::cast(caller)->external_name());
3435 } else {
3436 tty->print("[Loaded %s]\n", this_klass->external_name());
3437 }
3438 } else {
3439 ResourceMark rm;
3440 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3441 instanceKlass::cast(class_loader->klass())->external_name());
3442 }
3443 }
3445 if (TraceClassResolution) {
3446 // print out the superclass.
3447 const char * from = Klass::cast(this_klass())->external_name();
3448 if (this_klass->java_super() != NULL) {
3449 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3450 }
3451 // print out each of the interface classes referred to by this class.
3452 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3453 if (!local_interfaces.is_null()) {
3454 int length = local_interfaces->length();
3455 for (int i = 0; i < length; i++) {
3456 klassOop k = klassOop(local_interfaces->obj_at(i));
3457 instanceKlass* to_class = instanceKlass::cast(k);
3458 const char * to = to_class->external_name();
3459 tty->print("RESOLVE %s %s (interface)\n", from, to);
3460 }
3461 }
3462 }
3464 #ifndef PRODUCT
3465 if( PrintCompactFieldsSavings ) {
3466 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3467 tty->print("[Saved %d of %d bytes in %s]\n",
3468 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3469 orig_nonstatic_field_size*heapOopSize,
3470 this_klass->external_name());
3471 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3472 tty->print("[Wasted %d over %d bytes in %s]\n",
3473 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3474 orig_nonstatic_field_size*heapOopSize,
3475 this_klass->external_name());
3476 }
3477 }
3478 #endif
3480 // preserve result across HandleMark
3481 preserve_this_klass = this_klass();
3482 }
3484 // Create new handle outside HandleMark
3485 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3486 debug_only(this_klass->as_klassOop()->verify();)
3488 return this_klass;
3489 }
3492 unsigned int
3493 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3494 unsigned int nonstatic_oop_map_count,
3495 int first_nonstatic_oop_offset) {
3496 unsigned int map_count =
3497 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3498 if (nonstatic_oop_map_count > 0) {
3499 // We have oops to add to map
3500 if (map_count == 0) {
3501 map_count = nonstatic_oop_map_count;
3502 } else {
3503 // Check whether we should add a new map block or whether the last one can
3504 // be extended
3505 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3506 OopMapBlock* const last_map = first_map + map_count - 1;
3508 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3509 if (next_offset == first_nonstatic_oop_offset) {
3510 // There is no gap bettwen superklass's last oop field and first
3511 // local oop field, merge maps.
3512 nonstatic_oop_map_count -= 1;
3513 } else {
3514 // Superklass didn't end with a oop field, add extra maps
3515 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3516 }
3517 map_count += nonstatic_oop_map_count;
3518 }
3519 }
3520 return map_count;
3521 }
3524 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3525 unsigned int nonstatic_oop_map_count,
3526 int* nonstatic_oop_offsets,
3527 unsigned int* nonstatic_oop_counts) {
3528 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3529 const instanceKlass* const super = k->superklass();
3530 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3531 if (super_count > 0) {
3532 // Copy maps from superklass
3533 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3534 for (unsigned int i = 0; i < super_count; ++i) {
3535 *this_oop_map++ = *super_oop_map++;
3536 }
3537 }
3539 if (nonstatic_oop_map_count > 0) {
3540 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3541 // The counts differ because there is no gap between superklass's last oop
3542 // field and the first local oop field. Extend the last oop map copied
3543 // from the superklass instead of creating new one.
3544 nonstatic_oop_map_count--;
3545 nonstatic_oop_offsets++;
3546 this_oop_map--;
3547 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3548 this_oop_map++;
3549 }
3551 // Add new map blocks, fill them
3552 while (nonstatic_oop_map_count-- > 0) {
3553 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3554 this_oop_map->set_count(*nonstatic_oop_counts++);
3555 this_oop_map++;
3556 }
3557 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3558 this_oop_map, "sanity");
3559 }
3560 }
3563 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3564 klassOop super = k->super();
3566 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3567 // in which case we don't have to register objects as finalizable
3568 if (!_has_empty_finalizer) {
3569 if (_has_finalizer ||
3570 (super != NULL && super->klass_part()->has_finalizer())) {
3571 k->set_has_finalizer();
3572 }
3573 }
3575 #ifdef ASSERT
3576 bool f = false;
3577 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3578 vmSymbols::void_method_signature());
3579 if (m != NULL && !m->is_empty_method()) {
3580 f = true;
3581 }
3582 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3583 #endif
3585 // Check if this klass supports the java.lang.Cloneable interface
3586 if (SystemDictionary::Cloneable_klass_loaded()) {
3587 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3588 k->set_is_cloneable();
3589 }
3590 }
3592 // Check if this klass has a vanilla default constructor
3593 if (super == NULL) {
3594 // java.lang.Object has empty default constructor
3595 k->set_has_vanilla_constructor();
3596 } else {
3597 if (Klass::cast(super)->has_vanilla_constructor() &&
3598 _has_vanilla_constructor) {
3599 k->set_has_vanilla_constructor();
3600 }
3601 #ifdef ASSERT
3602 bool v = false;
3603 if (Klass::cast(super)->has_vanilla_constructor()) {
3604 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3605 ), vmSymbols::void_method_signature());
3606 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3607 v = true;
3608 }
3609 }
3610 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3611 #endif
3612 }
3614 // If it cannot be fast-path allocated, set a bit in the layout helper.
3615 // See documentation of instanceKlass::can_be_fastpath_allocated().
3616 assert(k->size_helper() > 0, "layout_helper is initialized");
3617 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3618 || k->is_abstract() || k->is_interface()
3619 || (k->name() == vmSymbols::java_lang_Class()
3620 && k->class_loader() == NULL)
3621 || k->size_helper() >= FastAllocateSizeLimit) {
3622 // Forbid fast-path allocation.
3623 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3624 k->set_layout_helper(lh);
3625 }
3626 }
3629 // utility method for appending and array with check for duplicates
3631 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3632 // iterate over new interfaces
3633 for (int i = 0; i < ifs->length(); i++) {
3634 oop e = ifs->obj_at(i);
3635 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3636 // check for duplicates
3637 bool duplicate = false;
3638 for (int j = 0; j < index; j++) {
3639 if (result->obj_at(j) == e) {
3640 duplicate = true;
3641 break;
3642 }
3643 }
3644 // add new interface
3645 if (!duplicate) {
3646 result->obj_at_put(index++, e);
3647 }
3648 }
3649 }
3651 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3652 // Compute maximum size for transitive interfaces
3653 int max_transitive_size = 0;
3654 int super_size = 0;
3655 // Add superclass transitive interfaces size
3656 if (super.not_null()) {
3657 super_size = super->transitive_interfaces()->length();
3658 max_transitive_size += super_size;
3659 }
3660 // Add local interfaces' super interfaces
3661 int local_size = local_ifs->length();
3662 for (int i = 0; i < local_size; i++) {
3663 klassOop l = klassOop(local_ifs->obj_at(i));
3664 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3665 }
3666 // Finally add local interfaces
3667 max_transitive_size += local_size;
3668 // Construct array
3669 objArrayHandle result;
3670 if (max_transitive_size == 0) {
3671 // no interfaces, use canonicalized array
3672 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3673 } else if (max_transitive_size == super_size) {
3674 // no new local interfaces added, share superklass' transitive interface array
3675 result = objArrayHandle(THREAD, super->transitive_interfaces());
3676 } else if (max_transitive_size == local_size) {
3677 // only local interfaces added, share local interface array
3678 result = local_ifs;
3679 } else {
3680 objArrayHandle nullHandle;
3681 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3682 result = objArrayHandle(THREAD, new_objarray);
3683 int index = 0;
3684 // Copy down from superclass
3685 if (super.not_null()) {
3686 append_interfaces(result, index, super->transitive_interfaces());
3687 }
3688 // Copy down from local interfaces' superinterfaces
3689 for (int i = 0; i < local_ifs->length(); i++) {
3690 klassOop l = klassOop(local_ifs->obj_at(i));
3691 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3692 }
3693 // Finally add local interfaces
3694 append_interfaces(result, index, local_ifs());
3696 // Check if duplicates were removed
3697 if (index != max_transitive_size) {
3698 assert(index < max_transitive_size, "just checking");
3699 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3700 for (int i = 0; i < index; i++) {
3701 oop e = result->obj_at(i);
3702 assert(e != NULL, "just checking");
3703 new_result->obj_at_put(i, e);
3704 }
3705 result = objArrayHandle(THREAD, new_result);
3706 }
3707 }
3708 return result;
3709 }
3712 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3713 klassOop super = this_klass->super();
3714 if ((super != NULL) &&
3715 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3716 ResourceMark rm(THREAD);
3717 Exceptions::fthrow(
3718 THREAD_AND_LOCATION,
3719 vmSymbols::java_lang_IllegalAccessError(),
3720 "class %s cannot access its superclass %s",
3721 this_klass->external_name(),
3722 instanceKlass::cast(super)->external_name()
3723 );
3724 return;
3725 }
3726 }
3729 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3730 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3731 int lng = local_interfaces->length();
3732 for (int i = lng - 1; i >= 0; i--) {
3733 klassOop k = klassOop(local_interfaces->obj_at(i));
3734 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3735 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3736 ResourceMark rm(THREAD);
3737 Exceptions::fthrow(
3738 THREAD_AND_LOCATION,
3739 vmSymbols::java_lang_IllegalAccessError(),
3740 "class %s cannot access its superinterface %s",
3741 this_klass->external_name(),
3742 instanceKlass::cast(k)->external_name()
3743 );
3744 return;
3745 }
3746 }
3747 }
3750 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3751 objArrayHandle methods (THREAD, this_klass->methods());
3752 int num_methods = methods->length();
3754 // go thru each method and check if it overrides a final method
3755 for (int index = 0; index < num_methods; index++) {
3756 methodOop m = (methodOop)methods->obj_at(index);
3758 // skip private, static and <init> methods
3759 if ((!m->is_private()) &&
3760 (!m->is_static()) &&
3761 (m->name() != vmSymbols::object_initializer_name())) {
3763 Symbol* name = m->name();
3764 Symbol* signature = m->signature();
3765 klassOop k = this_klass->super();
3766 methodOop super_m = NULL;
3767 while (k != NULL) {
3768 // skip supers that don't have final methods.
3769 if (k->klass_part()->has_final_method()) {
3770 // lookup a matching method in the super class hierarchy
3771 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3772 if (super_m == NULL) {
3773 break; // didn't find any match; get out
3774 }
3776 if (super_m->is_final() &&
3777 // matching method in super is final
3778 (Reflection::verify_field_access(this_klass->as_klassOop(),
3779 super_m->method_holder(),
3780 super_m->method_holder(),
3781 super_m->access_flags(), false))
3782 // this class can access super final method and therefore override
3783 ) {
3784 ResourceMark rm(THREAD);
3785 Exceptions::fthrow(
3786 THREAD_AND_LOCATION,
3787 vmSymbols::java_lang_VerifyError(),
3788 "class %s overrides final method %s.%s",
3789 this_klass->external_name(),
3790 name->as_C_string(),
3791 signature->as_C_string()
3792 );
3793 return;
3794 }
3796 // continue to look from super_m's holder's super.
3797 k = instanceKlass::cast(super_m->method_holder())->super();
3798 continue;
3799 }
3801 k = k->klass_part()->super();
3802 }
3803 }
3804 }
3805 }
3808 // assumes that this_klass is an interface
3809 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3810 assert(this_klass->is_interface(), "not an interface");
3811 objArrayHandle methods (THREAD, this_klass->methods());
3812 int num_methods = methods->length();
3814 for (int index = 0; index < num_methods; index++) {
3815 methodOop m = (methodOop)methods->obj_at(index);
3816 // if m is static and not the init method, throw a verify error
3817 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3818 ResourceMark rm(THREAD);
3819 Exceptions::fthrow(
3820 THREAD_AND_LOCATION,
3821 vmSymbols::java_lang_VerifyError(),
3822 "Illegal static method %s in interface %s",
3823 m->name()->as_C_string(),
3824 this_klass->external_name()
3825 );
3826 return;
3827 }
3828 }
3829 }
3831 // utility methods for format checking
3833 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3834 if (!_need_verify) { return; }
3836 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3837 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3838 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3839 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3840 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3841 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3842 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3844 if ((is_abstract && is_final) ||
3845 (is_interface && !is_abstract) ||
3846 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3847 (!is_interface && major_gte_15 && is_annotation)) {
3848 ResourceMark rm(THREAD);
3849 Exceptions::fthrow(
3850 THREAD_AND_LOCATION,
3851 vmSymbols::java_lang_ClassFormatError(),
3852 "Illegal class modifiers in class %s: 0x%X",
3853 _class_name->as_C_string(), flags
3854 );
3855 return;
3856 }
3857 }
3859 bool ClassFileParser::has_illegal_visibility(jint flags) {
3860 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3861 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3862 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3864 return ((is_public && is_protected) ||
3865 (is_public && is_private) ||
3866 (is_protected && is_private));
3867 }
3869 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3870 u2 max_version =
3871 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3872 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3873 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3874 (major <= max_version) &&
3875 ((major != max_version) ||
3876 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3877 }
3879 void ClassFileParser::verify_legal_field_modifiers(
3880 jint flags, bool is_interface, TRAPS) {
3881 if (!_need_verify) { return; }
3883 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3884 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3885 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3886 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3887 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3888 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3889 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3890 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3891 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3893 bool is_illegal = false;
3895 if (is_interface) {
3896 if (!is_public || !is_static || !is_final || is_private ||
3897 is_protected || is_volatile || is_transient ||
3898 (major_gte_15 && is_enum)) {
3899 is_illegal = true;
3900 }
3901 } else { // not interface
3902 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3903 is_illegal = true;
3904 }
3905 }
3907 if (is_illegal) {
3908 ResourceMark rm(THREAD);
3909 Exceptions::fthrow(
3910 THREAD_AND_LOCATION,
3911 vmSymbols::java_lang_ClassFormatError(),
3912 "Illegal field modifiers in class %s: 0x%X",
3913 _class_name->as_C_string(), flags);
3914 return;
3915 }
3916 }
3918 void ClassFileParser::verify_legal_method_modifiers(
3919 jint flags, bool is_interface, Symbol* name, TRAPS) {
3920 if (!_need_verify) { return; }
3922 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3923 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3924 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3925 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3926 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3927 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3928 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3929 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3930 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3931 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3932 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3934 bool is_illegal = false;
3936 if (is_interface) {
3937 if (!is_abstract || !is_public || is_static || is_final ||
3938 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3939 is_illegal = true;
3940 }
3941 } else { // not interface
3942 if (is_initializer) {
3943 if (is_static || is_final || is_synchronized || is_native ||
3944 is_abstract || (major_gte_15 && is_bridge)) {
3945 is_illegal = true;
3946 }
3947 } else { // not initializer
3948 if (is_abstract) {
3949 if ((is_final || is_native || is_private || is_static ||
3950 (major_gte_15 && (is_synchronized || is_strict)))) {
3951 is_illegal = true;
3952 }
3953 }
3954 if (has_illegal_visibility(flags)) {
3955 is_illegal = true;
3956 }
3957 }
3958 }
3960 if (is_illegal) {
3961 ResourceMark rm(THREAD);
3962 Exceptions::fthrow(
3963 THREAD_AND_LOCATION,
3964 vmSymbols::java_lang_ClassFormatError(),
3965 "Method %s in class %s has illegal modifiers: 0x%X",
3966 name->as_C_string(), _class_name->as_C_string(), flags);
3967 return;
3968 }
3969 }
3971 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3972 assert(_need_verify, "only called when _need_verify is true");
3973 int i = 0;
3974 int count = length >> 2;
3975 for (int k=0; k<count; k++) {
3976 unsigned char b0 = buffer[i];
3977 unsigned char b1 = buffer[i+1];
3978 unsigned char b2 = buffer[i+2];
3979 unsigned char b3 = buffer[i+3];
3980 // For an unsigned char v,
3981 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3982 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3983 unsigned char res = b0 | b0 - 1 |
3984 b1 | b1 - 1 |
3985 b2 | b2 - 1 |
3986 b3 | b3 - 1;
3987 if (res >= 128) break;
3988 i += 4;
3989 }
3990 for(; i < length; i++) {
3991 unsigned short c;
3992 // no embedded zeros
3993 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3994 if(buffer[i] < 128) {
3995 continue;
3996 }
3997 if ((i + 5) < length) { // see if it's legal supplementary character
3998 if (UTF8::is_supplementary_character(&buffer[i])) {
3999 c = UTF8::get_supplementary_character(&buffer[i]);
4000 i += 5;
4001 continue;
4002 }
4003 }
4004 switch (buffer[i] >> 4) {
4005 default: break;
4006 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4007 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4008 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4009 c = (buffer[i] & 0x1F) << 6;
4010 i++;
4011 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4012 c += buffer[i] & 0x3F;
4013 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4014 // for classes with major > 47, c must a null or a character in its shortest form
4015 break;
4016 }
4017 }
4018 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4019 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4020 c = (buffer[i] & 0xF) << 12;
4021 i += 2;
4022 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4023 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4024 if (_major_version <= 47 || c >= 0x800) {
4025 // for classes with major > 47, c must be in its shortest form
4026 break;
4027 }
4028 }
4029 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4030 } // end of switch
4031 } // end of for
4032 }
4034 // Checks if name is a legal class name.
4035 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4036 if (!_need_verify || _relax_verify) { return; }
4038 char buf[fixed_buffer_size];
4039 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4040 unsigned int length = name->utf8_length();
4041 bool legal = false;
4043 if (length > 0) {
4044 char* p;
4045 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4046 p = skip_over_field_signature(bytes, false, length, CHECK);
4047 legal = (p != NULL) && ((p - bytes) == (int)length);
4048 } else if (_major_version < JAVA_1_5_VERSION) {
4049 if (bytes[0] != '<') {
4050 p = skip_over_field_name(bytes, true, length);
4051 legal = (p != NULL) && ((p - bytes) == (int)length);
4052 }
4053 } else {
4054 // 4900761: relax the constraints based on JSR202 spec
4055 // Class names may be drawn from the entire Unicode character set.
4056 // Identifiers between '/' must be unqualified names.
4057 // The utf8 string has been verified when parsing cpool entries.
4058 legal = verify_unqualified_name(bytes, length, LegalClass);
4059 }
4060 }
4061 if (!legal) {
4062 ResourceMark rm(THREAD);
4063 Exceptions::fthrow(
4064 THREAD_AND_LOCATION,
4065 vmSymbols::java_lang_ClassFormatError(),
4066 "Illegal class name \"%s\" in class file %s", bytes,
4067 _class_name->as_C_string()
4068 );
4069 return;
4070 }
4071 }
4073 // Checks if name is a legal field name.
4074 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4075 if (!_need_verify || _relax_verify) { return; }
4077 char buf[fixed_buffer_size];
4078 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4079 unsigned int length = name->utf8_length();
4080 bool legal = false;
4082 if (length > 0) {
4083 if (_major_version < JAVA_1_5_VERSION) {
4084 if (bytes[0] != '<') {
4085 char* p = skip_over_field_name(bytes, false, length);
4086 legal = (p != NULL) && ((p - bytes) == (int)length);
4087 }
4088 } else {
4089 // 4881221: relax the constraints based on JSR202 spec
4090 legal = verify_unqualified_name(bytes, length, LegalField);
4091 }
4092 }
4094 if (!legal) {
4095 ResourceMark rm(THREAD);
4096 Exceptions::fthrow(
4097 THREAD_AND_LOCATION,
4098 vmSymbols::java_lang_ClassFormatError(),
4099 "Illegal field name \"%s\" in class %s", bytes,
4100 _class_name->as_C_string()
4101 );
4102 return;
4103 }
4104 }
4106 // Checks if name is a legal method name.
4107 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4108 if (!_need_verify || _relax_verify) { return; }
4110 assert(name != NULL, "method name is null");
4111 char buf[fixed_buffer_size];
4112 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4113 unsigned int length = name->utf8_length();
4114 bool legal = false;
4116 if (length > 0) {
4117 if (bytes[0] == '<') {
4118 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4119 legal = true;
4120 }
4121 } else if (_major_version < JAVA_1_5_VERSION) {
4122 char* p;
4123 p = skip_over_field_name(bytes, false, length);
4124 legal = (p != NULL) && ((p - bytes) == (int)length);
4125 } else {
4126 // 4881221: relax the constraints based on JSR202 spec
4127 legal = verify_unqualified_name(bytes, length, LegalMethod);
4128 }
4129 }
4131 if (!legal) {
4132 ResourceMark rm(THREAD);
4133 Exceptions::fthrow(
4134 THREAD_AND_LOCATION,
4135 vmSymbols::java_lang_ClassFormatError(),
4136 "Illegal method name \"%s\" in class %s", bytes,
4137 _class_name->as_C_string()
4138 );
4139 return;
4140 }
4141 }
4144 // Checks if signature is a legal field signature.
4145 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4146 if (!_need_verify) { return; }
4148 char buf[fixed_buffer_size];
4149 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4150 unsigned int length = signature->utf8_length();
4151 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4153 if (p == NULL || (p - bytes) != (int)length) {
4154 throwIllegalSignature("Field", name, signature, CHECK);
4155 }
4156 }
4158 // Checks if signature is a legal method signature.
4159 // Returns number of parameters
4160 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4161 if (!_need_verify) {
4162 // make sure caller's args_size will be less than 0 even for non-static
4163 // method so it will be recomputed in compute_size_of_parameters().
4164 return -2;
4165 }
4167 unsigned int args_size = 0;
4168 char buf[fixed_buffer_size];
4169 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4170 unsigned int length = signature->utf8_length();
4171 char* nextp;
4173 // The first character must be a '('
4174 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4175 length--;
4176 // Skip over legal field signatures
4177 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4178 while ((length > 0) && (nextp != NULL)) {
4179 args_size++;
4180 if (p[0] == 'J' || p[0] == 'D') {
4181 args_size++;
4182 }
4183 length -= nextp - p;
4184 p = nextp;
4185 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4186 }
4187 // The first non-signature thing better be a ')'
4188 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4189 length--;
4190 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4191 // All internal methods must return void
4192 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4193 return args_size;
4194 }
4195 } else {
4196 // Now we better just have a return value
4197 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4198 if (nextp && ((int)length == (nextp - p))) {
4199 return args_size;
4200 }
4201 }
4202 }
4203 }
4204 // Report error
4205 throwIllegalSignature("Method", name, signature, CHECK_0);
4206 return 0;
4207 }
4210 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4211 // Method names also may not contain the characters '<' or '>', unless <init>
4212 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4213 // method. Because these names have been checked as special cases before
4214 // calling this method in verify_legal_method_name.
4215 bool ClassFileParser::verify_unqualified_name(
4216 char* name, unsigned int length, int type) {
4217 jchar ch;
4219 for (char* p = name; p != name + length; ) {
4220 ch = *p;
4221 if (ch < 128) {
4222 p++;
4223 if (ch == '.' || ch == ';' || ch == '[' ) {
4224 return false; // do not permit '.', ';', or '['
4225 }
4226 if (type != LegalClass && ch == '/') {
4227 return false; // do not permit '/' unless it's class name
4228 }
4229 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4230 return false; // do not permit '<' or '>' in method names
4231 }
4232 } else {
4233 char* tmp_p = UTF8::next(p, &ch);
4234 p = tmp_p;
4235 }
4236 }
4237 return true;
4238 }
4241 // Take pointer to a string. Skip over the longest part of the string that could
4242 // be taken as a fieldname. Allow '/' if slash_ok is true.
4243 // Return a pointer to just past the fieldname.
4244 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4245 // being true, we saw consecutive slashes (meaning we were looking for a
4246 // qualified path but found something that was badly-formed).
4247 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4248 char* p;
4249 jchar ch;
4250 jboolean last_is_slash = false;
4251 jboolean not_first_ch = false;
4253 for (p = name; p != name + length; not_first_ch = true) {
4254 char* old_p = p;
4255 ch = *p;
4256 if (ch < 128) {
4257 p++;
4258 // quick check for ascii
4259 if ((ch >= 'a' && ch <= 'z') ||
4260 (ch >= 'A' && ch <= 'Z') ||
4261 (ch == '_' || ch == '$') ||
4262 (not_first_ch && ch >= '0' && ch <= '9')) {
4263 last_is_slash = false;
4264 continue;
4265 }
4266 if (slash_ok && ch == '/') {
4267 if (last_is_slash) {
4268 return NULL; // Don't permit consecutive slashes
4269 }
4270 last_is_slash = true;
4271 continue;
4272 }
4273 } else {
4274 jint unicode_ch;
4275 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4276 p = tmp_p;
4277 last_is_slash = false;
4278 // Check if ch is Java identifier start or is Java identifier part
4279 // 4672820: call java.lang.Character methods directly without generating separate tables.
4280 EXCEPTION_MARK;
4281 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4283 // return value
4284 JavaValue result(T_BOOLEAN);
4285 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4286 JavaCallArguments args;
4287 args.push_int(unicode_ch);
4289 // public static boolean isJavaIdentifierStart(char ch);
4290 JavaCalls::call_static(&result,
4291 klass,
4292 vmSymbols::isJavaIdentifierStart_name(),
4293 vmSymbols::int_bool_signature(),
4294 &args,
4295 THREAD);
4297 if (HAS_PENDING_EXCEPTION) {
4298 CLEAR_PENDING_EXCEPTION;
4299 return 0;
4300 }
4301 if (result.get_jboolean()) {
4302 continue;
4303 }
4305 if (not_first_ch) {
4306 // public static boolean isJavaIdentifierPart(char ch);
4307 JavaCalls::call_static(&result,
4308 klass,
4309 vmSymbols::isJavaIdentifierPart_name(),
4310 vmSymbols::int_bool_signature(),
4311 &args,
4312 THREAD);
4314 if (HAS_PENDING_EXCEPTION) {
4315 CLEAR_PENDING_EXCEPTION;
4316 return 0;
4317 }
4319 if (result.get_jboolean()) {
4320 continue;
4321 }
4322 }
4323 }
4324 return (not_first_ch) ? old_p : NULL;
4325 }
4326 return (not_first_ch) ? p : NULL;
4327 }
4330 // Take pointer to a string. Skip over the longest part of the string that could
4331 // be taken as a field signature. Allow "void" if void_ok.
4332 // Return a pointer to just past the signature.
4333 // Return NULL if no legal signature is found.
4334 char* ClassFileParser::skip_over_field_signature(char* signature,
4335 bool void_ok,
4336 unsigned int length,
4337 TRAPS) {
4338 unsigned int array_dim = 0;
4339 while (length > 0) {
4340 switch (signature[0]) {
4341 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4342 case JVM_SIGNATURE_BOOLEAN:
4343 case JVM_SIGNATURE_BYTE:
4344 case JVM_SIGNATURE_CHAR:
4345 case JVM_SIGNATURE_SHORT:
4346 case JVM_SIGNATURE_INT:
4347 case JVM_SIGNATURE_FLOAT:
4348 case JVM_SIGNATURE_LONG:
4349 case JVM_SIGNATURE_DOUBLE:
4350 return signature + 1;
4351 case JVM_SIGNATURE_CLASS: {
4352 if (_major_version < JAVA_1_5_VERSION) {
4353 // Skip over the class name if one is there
4354 char* p = skip_over_field_name(signature + 1, true, --length);
4356 // The next character better be a semicolon
4357 if (p && (p - signature) > 1 && p[0] == ';') {
4358 return p + 1;
4359 }
4360 } else {
4361 // 4900761: For class version > 48, any unicode is allowed in class name.
4362 length--;
4363 signature++;
4364 while (length > 0 && signature[0] != ';') {
4365 if (signature[0] == '.') {
4366 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4367 }
4368 length--;
4369 signature++;
4370 }
4371 if (signature[0] == ';') { return signature + 1; }
4372 }
4374 return NULL;
4375 }
4376 case JVM_SIGNATURE_ARRAY:
4377 array_dim++;
4378 if (array_dim > 255) {
4379 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4380 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4381 }
4382 // The rest of what's there better be a legal signature
4383 signature++;
4384 length--;
4385 void_ok = false;
4386 break;
4388 default:
4389 return NULL;
4390 }
4391 }
4392 return NULL;
4393 }