1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/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/instanceKlass.hpp"
40 #include "oops/instanceMirrorKlass.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/klassOop.hpp"
43 #include "oops/klassVtable.hpp"
44 #include "oops/methodOop.hpp"
45 #include "oops/symbol.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/perfData.hpp"
49 #include "runtime/reflection.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/timer.hpp"
52 #include "services/classLoadingService.hpp"
53 #include "services/threadService.hpp"
54
55 // We generally try to create the oops directly when parsing, rather than
56 // allocating temporary data structures and copying the bytes twice. A
57 // temporary area is only needed when parsing utf8 entries in the constant
58 // pool and when parsing line number tables.
59
60 // We add assert in debug mode when class format is not checked.
61
62 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
63 #define JAVA_MIN_SUPPORTED_VERSION 45
64 #define JAVA_MAX_SUPPORTED_VERSION 51
65 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
66
67 // Used for two backward compatibility reasons:
68 // - to check for new additions to the class file format in JDK1.5
69 // - to check for bug fixes in the format checker in JDK1.5
70 #define JAVA_1_5_VERSION 49
71
72 // Used for backward compatibility reasons:
73 // - to check for javac bug fixes that happened after 1.5
74 // - also used as the max version when running in jdk6
75 #define JAVA_6_VERSION 50
76
77 // Used for backward compatibility reasons:
78 // - to check NameAndType_info signatures more aggressively
79 #define JAVA_7_VERSION 51
80
81
82 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
83 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
84 // this function (_current can be allocated in a register, with scalar
85 // replacement of aggregates). The _current pointer is copied back to
86 // stream() when this function returns. DON'T call another method within
87 // this method that uses stream().
88 ClassFileStream* cfs0 = stream();
89 ClassFileStream cfs1 = *cfs0;
90 ClassFileStream* cfs = &cfs1;
91 #ifdef ASSERT
92 assert(cfs->allocated_on_stack(),"should be local");
93 u1* old_current = cfs0->current();
94 #endif
95
96 // Used for batching symbol allocations.
97 const char* names[SymbolTable::symbol_alloc_batch_size];
98 int lengths[SymbolTable::symbol_alloc_batch_size];
99 int indices[SymbolTable::symbol_alloc_batch_size];
100 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
101 int names_count = 0;
102
103 // parsing Index 0 is unused
104 for (int index = 1; index < length; index++) {
105 // Each of the following case guarantees one more byte in the stream
106 // for the following tag or the access_flags following constant pool,
107 // so we don't need bounds-check for reading tag.
108 u1 tag = cfs->get_u1_fast();
109 switch (tag) {
110 case JVM_CONSTANT_Class :
111 {
112 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
113 u2 name_index = cfs->get_u2_fast();
114 cp->klass_index_at_put(index, name_index);
115 }
116 break;
117 case JVM_CONSTANT_Fieldref :
118 {
119 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
120 u2 class_index = cfs->get_u2_fast();
121 u2 name_and_type_index = cfs->get_u2_fast();
122 cp->field_at_put(index, class_index, name_and_type_index);
123 }
124 break;
125 case JVM_CONSTANT_Methodref :
126 {
127 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
128 u2 class_index = cfs->get_u2_fast();
129 u2 name_and_type_index = cfs->get_u2_fast();
130 cp->method_at_put(index, class_index, name_and_type_index);
131 }
132 break;
133 case JVM_CONSTANT_InterfaceMethodref :
134 {
135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
136 u2 class_index = cfs->get_u2_fast();
137 u2 name_and_type_index = cfs->get_u2_fast();
138 cp->interface_method_at_put(index, class_index, name_and_type_index);
139 }
140 break;
141 case JVM_CONSTANT_String :
142 {
143 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
144 u2 string_index = cfs->get_u2_fast();
145 cp->string_index_at_put(index, string_index);
146 }
147 break;
148 case JVM_CONSTANT_MethodHandle :
149 case JVM_CONSTANT_MethodType :
150 if (!EnableMethodHandles ||
151 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
152 classfile_parse_error(
153 (!EnableMethodHandles ?
154 "This JVM does not support constant tag %u in class file %s" :
155 "Class file version does not support constant tag %u in class file %s"),
156 tag, CHECK);
157 }
158 if (tag == JVM_CONSTANT_MethodHandle) {
159 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
160 u1 ref_kind = cfs->get_u1_fast();
161 u2 method_index = cfs->get_u2_fast();
162 cp->method_handle_index_at_put(index, ref_kind, method_index);
163 } else if (tag == JVM_CONSTANT_MethodType) {
164 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
165 u2 signature_index = cfs->get_u2_fast();
166 cp->method_type_index_at_put(index, signature_index);
167 } else {
168 ShouldNotReachHere();
169 }
170 break;
171 case JVM_CONSTANT_InvokeDynamicTrans : // this tag appears only in old classfiles
172 case JVM_CONSTANT_InvokeDynamic :
173 {
174 if (!EnableInvokeDynamic ||
175 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
176 classfile_parse_error(
177 (!EnableInvokeDynamic ?
178 "This JVM does not support constant tag %u in class file %s" :
179 "Class file version does not support constant tag %u in class file %s"),
180 tag, CHECK);
181 }
182 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
183 u2 bootstrap_specifier_index = cfs->get_u2_fast();
184 u2 name_and_type_index = cfs->get_u2_fast();
185 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
186 if (!AllowTransitionalJSR292)
187 classfile_parse_error(
188 "This JVM does not support transitional InvokeDynamic tag %u in class file %s",
189 tag, CHECK);
190 cp->invoke_dynamic_trans_at_put(index, bootstrap_specifier_index, name_and_type_index);
191 break;
192 }
193 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
194 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
195 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
196 }
197 break;
198 case JVM_CONSTANT_Integer :
199 {
200 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
201 u4 bytes = cfs->get_u4_fast();
202 cp->int_at_put(index, (jint) bytes);
203 }
204 break;
205 case JVM_CONSTANT_Float :
206 {
207 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
208 u4 bytes = cfs->get_u4_fast();
209 cp->float_at_put(index, *(jfloat*)&bytes);
210 }
211 break;
212 case JVM_CONSTANT_Long :
213 // A mangled type might cause you to overrun allocated memory
214 guarantee_property(index+1 < length,
215 "Invalid constant pool entry %u in class file %s",
216 index, CHECK);
217 {
218 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
219 u8 bytes = cfs->get_u8_fast();
220 cp->long_at_put(index, bytes);
221 }
222 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
223 break;
224 case JVM_CONSTANT_Double :
225 // A mangled type might cause you to overrun allocated memory
226 guarantee_property(index+1 < length,
227 "Invalid constant pool entry %u in class file %s",
228 index, CHECK);
229 {
230 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
231 u8 bytes = cfs->get_u8_fast();
232 cp->double_at_put(index, *(jdouble*)&bytes);
233 }
234 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
235 break;
236 case JVM_CONSTANT_NameAndType :
237 {
238 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
239 u2 name_index = cfs->get_u2_fast();
240 u2 signature_index = cfs->get_u2_fast();
241 cp->name_and_type_at_put(index, name_index, signature_index);
242 }
243 break;
244 case JVM_CONSTANT_Utf8 :
245 {
246 cfs->guarantee_more(2, CHECK); // utf8_length
247 u2 utf8_length = cfs->get_u2_fast();
248 u1* utf8_buffer = cfs->get_u1_buffer();
249 assert(utf8_buffer != NULL, "null utf8 buffer");
250 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
251 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
252 cfs->skip_u1_fast(utf8_length);
253
254 // Before storing the symbol, make sure it's legal
255 if (_need_verify) {
256 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
257 }
258
259 if (AnonymousClasses && has_cp_patch_at(index)) {
260 Handle patch = clear_cp_patch_at(index);
261 guarantee_property(java_lang_String::is_instance(patch()),
262 "Illegal utf8 patch at %d in class file %s",
263 index, CHECK);
264 char* str = java_lang_String::as_utf8_string(patch());
265 // (could use java_lang_String::as_symbol instead, but might as well batch them)
266 utf8_buffer = (u1*) str;
267 utf8_length = (int) strlen(str);
268 }
269
270 unsigned int hash;
271 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
272 if (result == NULL) {
273 names[names_count] = (char*)utf8_buffer;
274 lengths[names_count] = utf8_length;
275 indices[names_count] = index;
276 hashValues[names_count++] = hash;
277 if (names_count == SymbolTable::symbol_alloc_batch_size) {
278 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
279 names_count = 0;
280 }
281 } else {
282 cp->symbol_at_put(index, result);
283 }
284 }
285 break;
286 default:
287 classfile_parse_error(
288 "Unknown constant tag %u in class file %s", tag, CHECK);
289 break;
290 }
291 }
292
293 // Allocate the remaining symbols
294 if (names_count > 0) {
295 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
296 }
297
298 // Copy _current pointer of local copy back to stream().
299 #ifdef ASSERT
300 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
301 #endif
302 cfs0->set_current(cfs1.current());
303 }
304
305 // This class unreferences constant pool symbols if an error has occurred
306 // while parsing the class before it is assigned into the class.
307 // If it gets an error after that it is unloaded and the constant pool will
308 // be cleaned up then.
309 class ConstantPoolCleaner : public StackObj {
310 constantPoolHandle _cphandle;
311 bool _in_error;
312 public:
313 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
314 ~ConstantPoolCleaner() {
315 if (_in_error && _cphandle.not_null()) {
316 _cphandle->unreference_symbols();
317 }
318 }
319 void set_in_error(bool clean) { _in_error = clean; }
320 };
321
322 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
323
324 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
325 ClassFileStream* cfs = stream();
326 constantPoolHandle nullHandle;
327
328 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
329 u2 length = cfs->get_u2_fast();
330 guarantee_property(
331 length >= 1, "Illegal constant pool size %u in class file %s",
332 length, CHECK_(nullHandle));
333 constantPoolOop constant_pool =
334 oopFactory::new_constantPool(length,
335 oopDesc::IsSafeConc,
336 CHECK_(nullHandle));
337 constantPoolHandle cp (THREAD, constant_pool);
338
339 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
340 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
341
342 // parsing constant pool entries
343 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
344
345 int index = 1; // declared outside of loops for portability
346
347 // first verification pass - validate cross references and fixup class and string constants
348 for (index = 1; index < length; index++) { // Index 0 is unused
349 jbyte tag = cp->tag_at(index).value();
350 switch (tag) {
351 case JVM_CONSTANT_Class :
352 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
353 break;
354 case JVM_CONSTANT_Fieldref :
355 // fall through
356 case JVM_CONSTANT_Methodref :
357 // fall through
358 case JVM_CONSTANT_InterfaceMethodref : {
359 if (!_need_verify) break;
360 int klass_ref_index = cp->klass_ref_index_at(index);
361 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
362 check_property(valid_cp_range(klass_ref_index, length) &&
363 is_klass_reference(cp, klass_ref_index),
364 "Invalid constant pool index %u in class file %s",
365 klass_ref_index,
366 CHECK_(nullHandle));
367 check_property(valid_cp_range(name_and_type_ref_index, length) &&
368 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
369 "Invalid constant pool index %u in class file %s",
370 name_and_type_ref_index,
371 CHECK_(nullHandle));
372 break;
373 }
374 case JVM_CONSTANT_String :
375 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
376 break;
377 case JVM_CONSTANT_Integer :
378 break;
379 case JVM_CONSTANT_Float :
380 break;
381 case JVM_CONSTANT_Long :
382 case JVM_CONSTANT_Double :
383 index++;
384 check_property(
385 (index < length && cp->tag_at(index).is_invalid()),
386 "Improper constant pool long/double index %u in class file %s",
387 index, CHECK_(nullHandle));
388 break;
389 case JVM_CONSTANT_NameAndType : {
390 if (!_need_verify) break;
391 int name_ref_index = cp->name_ref_index_at(index);
392 int signature_ref_index = cp->signature_ref_index_at(index);
393 check_property(
394 valid_cp_range(name_ref_index, length) &&
395 cp->tag_at(name_ref_index).is_utf8(),
396 "Invalid constant pool index %u in class file %s",
397 name_ref_index, CHECK_(nullHandle));
398 check_property(
399 valid_cp_range(signature_ref_index, length) &&
400 cp->tag_at(signature_ref_index).is_utf8(),
401 "Invalid constant pool index %u in class file %s",
402 signature_ref_index, CHECK_(nullHandle));
403 break;
404 }
405 case JVM_CONSTANT_Utf8 :
406 break;
407 case JVM_CONSTANT_UnresolvedClass : // fall-through
408 case JVM_CONSTANT_UnresolvedClassInError:
409 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
410 break;
411 case JVM_CONSTANT_ClassIndex :
412 {
413 int class_index = cp->klass_index_at(index);
414 check_property(
415 valid_cp_range(class_index, length) &&
416 cp->tag_at(class_index).is_utf8(),
417 "Invalid constant pool index %u in class file %s",
418 class_index, CHECK_(nullHandle));
419 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
420 }
421 break;
422 case JVM_CONSTANT_UnresolvedString :
423 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
424 break;
425 case JVM_CONSTANT_StringIndex :
426 {
427 int string_index = cp->string_index_at(index);
428 check_property(
429 valid_cp_range(string_index, length) &&
430 cp->tag_at(string_index).is_utf8(),
431 "Invalid constant pool index %u in class file %s",
432 string_index, CHECK_(nullHandle));
433 Symbol* sym = cp->symbol_at(string_index);
434 cp->unresolved_string_at_put(index, sym);
435 }
436 break;
437 case JVM_CONSTANT_MethodHandle :
438 {
439 int ref_index = cp->method_handle_index_at(index);
440 check_property(
441 valid_cp_range(ref_index, length) &&
442 EnableMethodHandles,
443 "Invalid constant pool index %u in class file %s",
444 ref_index, CHECK_(nullHandle));
445 constantTag tag = cp->tag_at(ref_index);
446 int ref_kind = cp->method_handle_ref_kind_at(index);
447 switch (ref_kind) {
448 case JVM_REF_getField:
449 case JVM_REF_getStatic:
450 case JVM_REF_putField:
451 case JVM_REF_putStatic:
452 check_property(
453 tag.is_field(),
454 "Invalid constant pool index %u in class file %s (not a field)",
455 ref_index, CHECK_(nullHandle));
456 break;
457 case JVM_REF_invokeVirtual:
458 case JVM_REF_invokeStatic:
459 case JVM_REF_invokeSpecial:
460 case JVM_REF_newInvokeSpecial:
461 check_property(
462 tag.is_method(),
463 "Invalid constant pool index %u in class file %s (not a method)",
464 ref_index, CHECK_(nullHandle));
465 break;
466 case JVM_REF_invokeInterface:
467 check_property(
468 tag.is_interface_method(),
469 "Invalid constant pool index %u in class file %s (not an interface method)",
470 ref_index, CHECK_(nullHandle));
471 break;
472 default:
473 classfile_parse_error(
474 "Bad method handle kind at constant pool index %u in class file %s",
475 index, CHECK_(nullHandle));
476 }
477 // Keep the ref_index unchanged. It will be indirected at link-time.
478 }
479 break;
480 case JVM_CONSTANT_MethodType :
481 {
482 int ref_index = cp->method_type_index_at(index);
483 check_property(
484 valid_cp_range(ref_index, length) &&
485 cp->tag_at(ref_index).is_utf8() &&
486 EnableMethodHandles,
487 "Invalid constant pool index %u in class file %s",
488 ref_index, CHECK_(nullHandle));
489 }
490 break;
491 case JVM_CONSTANT_InvokeDynamicTrans :
492 case JVM_CONSTANT_InvokeDynamic :
493 {
494 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
495 check_property(valid_cp_range(name_and_type_ref_index, length) &&
496 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
497 "Invalid constant pool index %u in class file %s",
498 name_and_type_ref_index,
499 CHECK_(nullHandle));
500 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
501 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
502 check_property(valid_cp_range(bootstrap_method_ref_index, length) &&
503 cp->tag_at(bootstrap_method_ref_index).is_method_handle(),
504 "Invalid constant pool index %u in class file %s",
505 bootstrap_method_ref_index,
506 CHECK_(nullHandle));
507 }
508 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
509 break;
510 }
511 default:
512 fatal(err_msg("bad constant pool tag value %u",
513 cp->tag_at(index).value()));
514 ShouldNotReachHere();
515 break;
516 } // end of switch
517 } // end of for
518
519 if (_cp_patches != NULL) {
520 // need to treat this_class specially...
521 assert(AnonymousClasses, "");
522 int this_class_index;
523 {
524 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
525 u1* mark = cfs->current();
526 u2 flags = cfs->get_u2_fast();
527 this_class_index = cfs->get_u2_fast();
528 cfs->set_current(mark); // revert to mark
529 }
530
531 for (index = 1; index < length; index++) { // Index 0 is unused
532 if (has_cp_patch_at(index)) {
533 guarantee_property(index != this_class_index,
534 "Illegal constant pool patch to self at %d in class file %s",
535 index, CHECK_(nullHandle));
536 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
537 }
538 }
539 // Ensure that all the patches have been used.
540 for (index = 0; index < _cp_patches->length(); index++) {
541 guarantee_property(!has_cp_patch_at(index),
542 "Unused constant pool patch at %d in class file %s",
543 index, CHECK_(nullHandle));
544 }
545 }
546
547 if (!_need_verify) {
548 cp_in_error.set_in_error(false);
549 return cp;
550 }
551
552 // second verification pass - checks the strings are of the right format.
553 // but not yet to the other entries
554 for (index = 1; index < length; index++) {
555 jbyte tag = cp->tag_at(index).value();
556 switch (tag) {
557 case JVM_CONSTANT_UnresolvedClass: {
558 Symbol* class_name = cp->unresolved_klass_at(index);
559 // check the name, even if _cp_patches will overwrite it
560 verify_legal_class_name(class_name, CHECK_(nullHandle));
561 break;
562 }
563 case JVM_CONSTANT_NameAndType: {
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 int sig_index = cp->signature_ref_index_at(index);
566 int name_index = cp->name_ref_index_at(index);
567 Symbol* name = cp->symbol_at(name_index);
568 Symbol* sig = cp->symbol_at(sig_index);
569 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
570 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
571 } else {
572 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
573 }
574 }
575 break;
576 }
577 case JVM_CONSTANT_Fieldref:
578 case JVM_CONSTANT_Methodref:
579 case JVM_CONSTANT_InterfaceMethodref: {
580 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
581 // already verified to be utf8
582 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
583 // already verified to be utf8
584 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
585 Symbol* name = cp->symbol_at(name_ref_index);
586 Symbol* signature = cp->symbol_at(signature_ref_index);
587 if (tag == JVM_CONSTANT_Fieldref) {
588 verify_legal_field_name(name, CHECK_(nullHandle));
589 if (_need_verify && _major_version >= JAVA_7_VERSION) {
590 // Signature is verified above, when iterating NameAndType_info.
591 // Need only to be sure it's the right type.
592 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
593 throwIllegalSignature(
594 "Field", name, signature, CHECK_(nullHandle));
595 }
596 } else {
597 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
598 }
599 } else {
600 verify_legal_method_name(name, CHECK_(nullHandle));
601 if (_need_verify && _major_version >= JAVA_7_VERSION) {
602 // Signature is verified above, when iterating NameAndType_info.
603 // Need only to be sure it's the right type.
604 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
605 throwIllegalSignature(
606 "Method", name, signature, CHECK_(nullHandle));
607 }
608 } else {
609 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
610 }
611 if (tag == JVM_CONSTANT_Methodref) {
612 // 4509014: If a class method name begins with '<', it must be "<init>".
613 assert(name != NULL, "method name in constant pool is null");
614 unsigned int name_len = name->utf8_length();
615 assert(name_len > 0, "bad method name"); // already verified as legal name
616 if (name->byte_at(0) == '<') {
617 if (name != vmSymbols::object_initializer_name()) {
618 classfile_parse_error(
619 "Bad method name at constant pool index %u in class file %s",
620 name_ref_index, CHECK_(nullHandle));
621 }
622 }
623 }
624 }
625 break;
626 }
627 case JVM_CONSTANT_MethodHandle: {
628 int ref_index = cp->method_handle_index_at(index);
629 int ref_kind = cp->method_handle_ref_kind_at(index);
630 switch (ref_kind) {
631 case JVM_REF_invokeVirtual:
632 case JVM_REF_invokeStatic:
633 case JVM_REF_invokeSpecial:
634 case JVM_REF_newInvokeSpecial:
635 {
636 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
637 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
638 Symbol* name = cp->symbol_at(name_ref_index);
639 if (ref_kind == JVM_REF_newInvokeSpecial) {
640 if (name != vmSymbols::object_initializer_name()) {
641 classfile_parse_error(
642 "Bad constructor name at constant pool index %u in class file %s",
643 name_ref_index, CHECK_(nullHandle));
644 }
645 } else {
646 if (name == vmSymbols::object_initializer_name()) {
647 classfile_parse_error(
648 "Bad method name at constant pool index %u in class file %s",
649 name_ref_index, CHECK_(nullHandle));
650 }
651 }
652 }
653 break;
654 // Other ref_kinds are already fully checked in previous pass.
655 }
656 break;
657 }
658 case JVM_CONSTANT_MethodType: {
659 Symbol* no_name = vmSymbols::type_name(); // place holder
660 Symbol* signature = cp->method_type_signature_at(index);
661 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
662 break;
663 }
664 case JVM_CONSTANT_Utf8: {
665 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
666 }
667 } // end of switch
668 } // end of for
669
670 cp_in_error.set_in_error(false);
671 return cp;
672 }
673
674
675 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
676 assert(AnonymousClasses, "");
677 BasicType patch_type = T_VOID;
678 switch (cp->tag_at(index).value()) {
679
680 case JVM_CONSTANT_UnresolvedClass :
681 // Patching a class means pre-resolving it.
682 // The name in the constant pool is ignored.
683 if (java_lang_Class::is_instance(patch())) {
684 guarantee_property(!java_lang_Class::is_primitive(patch()),
685 "Illegal class patch at %d in class file %s",
686 index, CHECK);
687 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
688 } else {
689 guarantee_property(java_lang_String::is_instance(patch()),
690 "Illegal class patch at %d in class file %s",
691 index, CHECK);
692 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
693 cp->unresolved_klass_at_put(index, name);
694 }
695 break;
696
697 case JVM_CONSTANT_UnresolvedString :
698 // Patching a string means pre-resolving it.
699 // The spelling in the constant pool is ignored.
700 // The constant reference may be any object whatever.
701 // If it is not a real interned string, the constant is referred
702 // to as a "pseudo-string", and must be presented to the CP
703 // explicitly, because it may require scavenging.
704 cp->pseudo_string_at_put(index, patch());
705 break;
706
707 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
708 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
709 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
710 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
711 patch_prim:
712 {
713 jvalue value;
714 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
715 guarantee_property(value_type == patch_type,
716 "Illegal primitive patch at %d in class file %s",
717 index, CHECK);
718 switch (value_type) {
719 case T_INT: cp->int_at_put(index, value.i); break;
720 case T_FLOAT: cp->float_at_put(index, value.f); break;
721 case T_LONG: cp->long_at_put(index, value.j); break;
722 case T_DOUBLE: cp->double_at_put(index, value.d); break;
723 default: assert(false, "");
724 }
725 }
726 break;
727
728 default:
729 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
730 guarantee_property(!has_cp_patch_at(index),
731 "Illegal unexpected patch at %d in class file %s",
732 index, CHECK);
733 return;
734 }
735
736 // On fall-through, mark the patch as used.
737 clear_cp_patch_at(index);
738 }
739
740
741
742 class NameSigHash: public ResourceObj {
743 public:
744 Symbol* _name; // name
745 Symbol* _sig; // signature
746 NameSigHash* _next; // Next entry in hash table
747 };
748
749
750 #define HASH_ROW_SIZE 256
751
752 unsigned int hash(Symbol* name, Symbol* sig) {
753 unsigned int raw_hash = 0;
754 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
755 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
756
757 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
758 }
759
760
761 void initialize_hashtable(NameSigHash** table) {
762 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
763 }
764
765 // Return false if the name/sig combination is found in table.
766 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
767 // The old format checker uses heap sort to find duplicates.
768 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
769 // of table since we don't expect Symbol*'s to move.
770 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
771 assert(name != NULL, "name in constant pool is NULL");
772
773 // First lookup for duplicates
774 int index = hash(name, sig);
775 NameSigHash* entry = table[index];
776 while (entry != NULL) {
777 if (entry->_name == name && entry->_sig == sig) {
778 return false;
779 }
780 entry = entry->_next;
781 }
782
783 // No duplicate is found, allocate a new entry and fill it.
784 entry = new NameSigHash();
785 entry->_name = name;
786 entry->_sig = sig;
787
788 // Insert into hash table
789 entry->_next = table[index];
790 table[index] = entry;
791
792 return true;
793 }
794
795
796 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
797 int length,
798 Handle class_loader,
799 Handle protection_domain,
800 Symbol* class_name,
801 TRAPS) {
802 ClassFileStream* cfs = stream();
803 assert(length > 0, "only called for length>0");
804 objArrayHandle nullHandle;
805 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
806 objArrayHandle interfaces (THREAD, interface_oop);
807
808 int index;
809 for (index = 0; index < length; index++) {
810 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
811 KlassHandle interf;
812 check_property(
813 valid_cp_range(interface_index, cp->length()) &&
814 is_klass_reference(cp, interface_index),
815 "Interface name has bad constant pool index %u in class file %s",
816 interface_index, CHECK_(nullHandle));
817 if (cp->tag_at(interface_index).is_klass()) {
818 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
819 } else {
820 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
821
822 // Don't need to check legal name because it's checked when parsing constant pool.
823 // But need to make sure it's not an array type.
824 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
825 "Bad interface name in class file %s", CHECK_(nullHandle));
826
827 // Call resolve_super so classcircularity is checked
828 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
829 unresolved_klass, class_loader, protection_domain,
830 false, CHECK_(nullHandle));
831 interf = KlassHandle(THREAD, k);
832
833 if (LinkWellKnownClasses) // my super type is well known to me
834 cp->klass_at_put(interface_index, interf()); // eagerly resolve
835 }
836
837 if (!Klass::cast(interf())->is_interface()) {
838 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
839 }
840 interfaces->obj_at_put(index, interf());
841 }
842
843 if (!_need_verify || length <= 1) {
844 return interfaces;
845 }
846
847 // Check if there's any duplicates in interfaces
848 ResourceMark rm(THREAD);
849 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
850 THREAD, NameSigHash*, HASH_ROW_SIZE);
851 initialize_hashtable(interface_names);
852 bool dup = false;
853 {
854 debug_only(No_Safepoint_Verifier nsv;)
855 for (index = 0; index < length; index++) {
856 klassOop k = (klassOop)interfaces->obj_at(index);
857 Symbol* name = instanceKlass::cast(k)->name();
858 // If no duplicates, add (name, NULL) in hashtable interface_names.
859 if (!put_after_lookup(name, NULL, interface_names)) {
860 dup = true;
861 break;
862 }
863 }
864 }
865 if (dup) {
866 classfile_parse_error("Duplicate interface name in class file %s",
867 CHECK_(nullHandle));
868 }
869
870 return interfaces;
871 }
872
873
874 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
875 // Make sure the constant pool entry is of a type appropriate to this field
876 guarantee_property(
877 (constantvalue_index > 0 &&
878 constantvalue_index < cp->length()),
879 "Bad initial value index %u in ConstantValue attribute in class file %s",
880 constantvalue_index, CHECK);
881 constantTag value_type = cp->tag_at(constantvalue_index);
882 switch ( cp->basic_type_for_signature_at(signature_index) ) {
883 case T_LONG:
884 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
885 break;
886 case T_FLOAT:
887 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
888 break;
889 case T_DOUBLE:
890 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
891 break;
892 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
893 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
894 break;
895 case T_OBJECT:
896 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
897 && (value_type.is_string() || value_type.is_unresolved_string())),
898 "Bad string initial value in class file %s", CHECK);
899 break;
900 default:
901 classfile_parse_error(
902 "Unable to set initial value %u in class file %s",
903 constantvalue_index, CHECK);
904 }
905 }
906
907
908 // Parse attributes for a field.
909 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
910 u2 attributes_count,
911 bool is_static, u2 signature_index,
912 u2* constantvalue_index_addr,
913 bool* is_synthetic_addr,
914 u2* generic_signature_index_addr,
915 typeArrayHandle* field_annotations,
916 TRAPS) {
917 ClassFileStream* cfs = stream();
918 assert(attributes_count > 0, "length should be greater than 0");
919 u2 constantvalue_index = 0;
920 u2 generic_signature_index = 0;
921 bool is_synthetic = false;
922 u1* runtime_visible_annotations = NULL;
923 int runtime_visible_annotations_length = 0;
924 u1* runtime_invisible_annotations = NULL;
925 int runtime_invisible_annotations_length = 0;
926 while (attributes_count--) {
927 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
928 u2 attribute_name_index = cfs->get_u2_fast();
929 u4 attribute_length = cfs->get_u4_fast();
930 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
931 cp->tag_at(attribute_name_index).is_utf8(),
932 "Invalid field attribute index %u in class file %s",
933 attribute_name_index,
934 CHECK);
935 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
936 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
937 // ignore if non-static
938 if (constantvalue_index != 0) {
939 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
940 }
941 check_property(
942 attribute_length == 2,
943 "Invalid ConstantValue field attribute length %u in class file %s",
944 attribute_length, CHECK);
945 constantvalue_index = cfs->get_u2(CHECK);
946 if (_need_verify) {
947 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
948 }
949 } else if (attribute_name == vmSymbols::tag_synthetic()) {
950 if (attribute_length != 0) {
951 classfile_parse_error(
952 "Invalid Synthetic field attribute length %u in class file %s",
953 attribute_length, CHECK);
954 }
955 is_synthetic = true;
956 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
957 if (attribute_length != 0) {
958 classfile_parse_error(
959 "Invalid Deprecated field attribute length %u in class file %s",
960 attribute_length, CHECK);
961 }
962 } else if (_major_version >= JAVA_1_5_VERSION) {
963 if (attribute_name == vmSymbols::tag_signature()) {
964 if (attribute_length != 2) {
965 classfile_parse_error(
966 "Wrong size %u for field's Signature attribute in class file %s",
967 attribute_length, CHECK);
968 }
969 generic_signature_index = cfs->get_u2(CHECK);
970 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
971 runtime_visible_annotations_length = attribute_length;
972 runtime_visible_annotations = cfs->get_u1_buffer();
973 assert(runtime_visible_annotations != NULL, "null visible annotations");
974 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
975 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
976 runtime_invisible_annotations_length = attribute_length;
977 runtime_invisible_annotations = cfs->get_u1_buffer();
978 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
979 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
980 } else {
981 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
982 }
983 } else {
984 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
985 }
986 }
987
988 *constantvalue_index_addr = constantvalue_index;
989 *is_synthetic_addr = is_synthetic;
990 *generic_signature_index_addr = generic_signature_index;
991 *field_annotations = assemble_annotations(runtime_visible_annotations,
992 runtime_visible_annotations_length,
993 runtime_invisible_annotations,
994 runtime_invisible_annotations_length,
995 CHECK);
996 return;
997 }
998
999
1000 // Field allocation types. Used for computing field offsets.
1001
1002 enum FieldAllocationType {
1003 STATIC_OOP, // Oops
1004 STATIC_BYTE, // Boolean, Byte, char
1005 STATIC_SHORT, // shorts
1006 STATIC_WORD, // ints
1007 STATIC_DOUBLE, // long or double
1008 STATIC_ALIGNED_DOUBLE,// aligned long or double
1009 NONSTATIC_OOP,
1010 NONSTATIC_BYTE,
1011 NONSTATIC_SHORT,
1012 NONSTATIC_WORD,
1013 NONSTATIC_DOUBLE,
1014 NONSTATIC_ALIGNED_DOUBLE
1015 };
1016
1017
1018 struct FieldAllocationCount {
1019 unsigned int static_oop_count;
1020 unsigned int static_byte_count;
1021 unsigned int static_short_count;
1022 unsigned int static_word_count;
1023 unsigned int static_double_count;
1024 unsigned int nonstatic_oop_count;
1025 unsigned int nonstatic_byte_count;
1026 unsigned int nonstatic_short_count;
1027 unsigned int nonstatic_word_count;
1028 unsigned int nonstatic_double_count;
1029 };
1030
1031 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
1032 struct FieldAllocationCount *fac,
1033 objArrayHandle* fields_annotations, TRAPS) {
1034 ClassFileStream* cfs = stream();
1035 typeArrayHandle nullHandle;
1036 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1037 u2 length = cfs->get_u2_fast();
1038 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1039 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1040 typeArrayHandle fields(THREAD, new_fields);
1041
1042 int index = 0;
1043 typeArrayHandle field_annotations;
1044 for (int n = 0; n < length; n++) {
1045 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1046
1047 AccessFlags access_flags;
1048 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1049 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1050 access_flags.set_flags(flags);
1051
1052 u2 name_index = cfs->get_u2_fast();
1053 int cp_size = cp->length();
1054 check_property(
1055 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1056 "Invalid constant pool index %u for field name in class file %s",
1057 name_index, CHECK_(nullHandle));
1058 Symbol* name = cp->symbol_at(name_index);
1059 verify_legal_field_name(name, CHECK_(nullHandle));
1060
1061 u2 signature_index = cfs->get_u2_fast();
1062 check_property(
1063 valid_cp_range(signature_index, cp_size) &&
1064 cp->tag_at(signature_index).is_utf8(),
1065 "Invalid constant pool index %u for field signature in class file %s",
1066 signature_index, CHECK_(nullHandle));
1067 Symbol* sig = cp->symbol_at(signature_index);
1068 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1069
1070 u2 constantvalue_index = 0;
1071 bool is_synthetic = false;
1072 u2 generic_signature_index = 0;
1073 bool is_static = access_flags.is_static();
1074
1075 u2 attributes_count = cfs->get_u2_fast();
1076 if (attributes_count > 0) {
1077 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1078 &constantvalue_index, &is_synthetic,
1079 &generic_signature_index, &field_annotations,
1080 CHECK_(nullHandle));
1081 if (field_annotations.not_null()) {
1082 if (fields_annotations->is_null()) {
1083 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1084 *fields_annotations = objArrayHandle(THREAD, md);
1085 }
1086 (*fields_annotations)->obj_at_put(n, field_annotations());
1087 }
1088 if (is_synthetic) {
1089 access_flags.set_is_synthetic();
1090 }
1091 }
1092
1093 fields->short_at_put(index++, access_flags.as_short());
1094 fields->short_at_put(index++, name_index);
1095 fields->short_at_put(index++, signature_index);
1096 fields->short_at_put(index++, constantvalue_index);
1097
1098 // Remember how many oops we encountered and compute allocation type
1099 BasicType type = cp->basic_type_for_signature_at(signature_index);
1100 FieldAllocationType atype;
1101 if ( is_static ) {
1102 switch ( type ) {
1103 case T_BOOLEAN:
1104 case T_BYTE:
1105 fac->static_byte_count++;
1106 atype = STATIC_BYTE;
1107 break;
1108 case T_LONG:
1109 case T_DOUBLE:
1110 if (Universe::field_type_should_be_aligned(type)) {
1111 atype = STATIC_ALIGNED_DOUBLE;
1112 } else {
1113 atype = STATIC_DOUBLE;
1114 }
1115 fac->static_double_count++;
1116 break;
1117 case T_CHAR:
1118 case T_SHORT:
1119 fac->static_short_count++;
1120 atype = STATIC_SHORT;
1121 break;
1122 case T_FLOAT:
1123 case T_INT:
1124 fac->static_word_count++;
1125 atype = STATIC_WORD;
1126 break;
1127 case T_ARRAY:
1128 case T_OBJECT:
1129 fac->static_oop_count++;
1130 atype = STATIC_OOP;
1131 break;
1132 case T_ADDRESS:
1133 case T_VOID:
1134 default:
1135 assert(0, "bad field type");
1136 }
1137 } else {
1138 switch ( type ) {
1139 case T_BOOLEAN:
1140 case T_BYTE:
1141 fac->nonstatic_byte_count++;
1142 atype = NONSTATIC_BYTE;
1143 break;
1144 case T_LONG:
1145 case T_DOUBLE:
1146 if (Universe::field_type_should_be_aligned(type)) {
1147 atype = NONSTATIC_ALIGNED_DOUBLE;
1148 } else {
1149 atype = NONSTATIC_DOUBLE;
1150 }
1151 fac->nonstatic_double_count++;
1152 break;
1153 case T_CHAR:
1154 case T_SHORT:
1155 fac->nonstatic_short_count++;
1156 atype = NONSTATIC_SHORT;
1157 break;
1158 case T_FLOAT:
1159 case T_INT:
1160 fac->nonstatic_word_count++;
1161 atype = NONSTATIC_WORD;
1162 break;
1163 case T_ARRAY:
1164 case T_OBJECT:
1165 fac->nonstatic_oop_count++;
1166 atype = NONSTATIC_OOP;
1167 break;
1168 case T_ADDRESS:
1169 case T_VOID:
1170 default:
1171 assert(0, "bad field type");
1172 }
1173 }
1174
1175 // The correct offset is computed later (all oop fields will be located together)
1176 // We temporarily store the allocation type in the offset field
1177 fields->short_at_put(index++, atype);
1178 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1179 fields->short_at_put(index++, generic_signature_index);
1180 }
1181
1182 if (_need_verify && length > 1) {
1183 // Check duplicated fields
1184 ResourceMark rm(THREAD);
1185 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1186 THREAD, NameSigHash*, HASH_ROW_SIZE);
1187 initialize_hashtable(names_and_sigs);
1188 bool dup = false;
1189 {
1190 debug_only(No_Safepoint_Verifier nsv;)
1191 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1192 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1193 Symbol* name = cp->symbol_at(name_index);
1194 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1195 Symbol* sig = cp->symbol_at(sig_index);
1196 // If no duplicates, add name/signature in hashtable names_and_sigs.
1197 if (!put_after_lookup(name, sig, names_and_sigs)) {
1198 dup = true;
1199 break;
1200 }
1201 }
1202 }
1203 if (dup) {
1204 classfile_parse_error("Duplicate field name&signature in class file %s",
1205 CHECK_(nullHandle));
1206 }
1207 }
1208
1209 return fields;
1210 }
1211
1212
1213 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1214 while (length-- > 0) {
1215 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1216 }
1217 }
1218
1219
1220 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1221 u4 exception_table_length,
1222 constantPoolHandle cp,
1223 TRAPS) {
1224 ClassFileStream* cfs = stream();
1225 typeArrayHandle nullHandle;
1226
1227 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1228 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1229 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1230
1231 int index = 0;
1232 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1233 for (unsigned int i = 0; i < exception_table_length; i++) {
1234 u2 start_pc = cfs->get_u2_fast();
1235 u2 end_pc = cfs->get_u2_fast();
1236 u2 handler_pc = cfs->get_u2_fast();
1237 u2 catch_type_index = cfs->get_u2_fast();
1238 // Will check legal target after parsing code array in verifier.
1239 if (_need_verify) {
1240 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1241 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1242 guarantee_property(handler_pc < code_length,
1243 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1244 if (catch_type_index != 0) {
1245 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1246 is_klass_reference(cp, catch_type_index),
1247 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1248 }
1249 }
1250 exception_handlers->int_at_put(index++, start_pc);
1251 exception_handlers->int_at_put(index++, end_pc);
1252 exception_handlers->int_at_put(index++, handler_pc);
1253 exception_handlers->int_at_put(index++, catch_type_index);
1254 }
1255 return exception_handlers;
1256 }
1257
1258 void ClassFileParser::parse_linenumber_table(
1259 u4 code_attribute_length, u4 code_length,
1260 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1261 ClassFileStream* cfs = stream();
1262 unsigned int num_entries = cfs->get_u2(CHECK);
1263
1264 // Each entry is a u2 start_pc, and a u2 line_number
1265 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1266
1267 // Verify line number attribute and table length
1268 check_property(
1269 code_attribute_length == sizeof(u2) + length_in_bytes,
1270 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1271
1272 cfs->guarantee_more(length_in_bytes, CHECK);
1273
1274 if ((*write_stream) == NULL) {
1275 if (length_in_bytes > fixed_buffer_size) {
1276 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1277 } else {
1278 (*write_stream) = new CompressedLineNumberWriteStream(
1279 linenumbertable_buffer, fixed_buffer_size);
1280 }
1281 }
1282
1283 while (num_entries-- > 0) {
1284 u2 bci = cfs->get_u2_fast(); // start_pc
1285 u2 line = cfs->get_u2_fast(); // line_number
1286 guarantee_property(bci < code_length,
1287 "Invalid pc in LineNumberTable in class file %s", CHECK);
1288 (*write_stream)->write_pair(bci, line);
1289 }
1290 }
1291
1292
1293 // Class file LocalVariableTable elements.
1294 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1295 public:
1296 u2 start_bci;
1297 u2 length;
1298 u2 name_cp_index;
1299 u2 descriptor_cp_index;
1300 u2 slot;
1301 };
1302
1303
1304 class LVT_Hash: public CHeapObj {
1305 public:
1306 LocalVariableTableElement *_elem; // element
1307 LVT_Hash* _next; // Next entry in hash table
1308 };
1309
1310 unsigned int hash(LocalVariableTableElement *elem) {
1311 unsigned int raw_hash = elem->start_bci;
1312
1313 raw_hash = elem->length + raw_hash * 37;
1314 raw_hash = elem->name_cp_index + raw_hash * 37;
1315 raw_hash = elem->slot + raw_hash * 37;
1316
1317 return raw_hash % HASH_ROW_SIZE;
1318 }
1319
1320 void initialize_hashtable(LVT_Hash** table) {
1321 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1322 table[i] = NULL;
1323 }
1324 }
1325
1326 void clear_hashtable(LVT_Hash** table) {
1327 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1328 LVT_Hash* current = table[i];
1329 LVT_Hash* next;
1330 while (current != NULL) {
1331 next = current->_next;
1332 current->_next = NULL;
1333 delete(current);
1334 current = next;
1335 }
1336 table[i] = NULL;
1337 }
1338 }
1339
1340 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1341 LVT_Hash* entry = table[index];
1342
1343 /*
1344 * 3-tuple start_bci/length/slot has to be unique key,
1345 * so the following comparison seems to be redundant:
1346 * && elem->name_cp_index == entry->_elem->name_cp_index
1347 */
1348 while (entry != NULL) {
1349 if (elem->start_bci == entry->_elem->start_bci
1350 && elem->length == entry->_elem->length
1351 && elem->name_cp_index == entry->_elem->name_cp_index
1352 && elem->slot == entry->_elem->slot
1353 ) {
1354 return entry;
1355 }
1356 entry = entry->_next;
1357 }
1358 return NULL;
1359 }
1360
1361 // Return false if the local variable is found in table.
1362 // Return true if no duplicate is found.
1363 // And local variable is added as a new entry in table.
1364 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1365 // First lookup for duplicates
1366 int index = hash(elem);
1367 LVT_Hash* entry = LVT_lookup(elem, index, table);
1368
1369 if (entry != NULL) {
1370 return false;
1371 }
1372 // No duplicate is found, allocate a new entry and fill it.
1373 if ((entry = new LVT_Hash()) == NULL) {
1374 return false;
1375 }
1376 entry->_elem = elem;
1377
1378 // Insert into hash table
1379 entry->_next = table[index];
1380 table[index] = entry;
1381
1382 return true;
1383 }
1384
1385 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1386 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1387 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1388 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1389 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1390 lvt->signature_cp_index = 0;
1391 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1392 }
1393
1394 // Function is used to parse both attributes:
1395 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1396 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1397 u2 max_locals,
1398 u4 code_attribute_length,
1399 constantPoolHandle cp,
1400 u2* localvariable_table_length,
1401 bool isLVTT,
1402 TRAPS) {
1403 ClassFileStream* cfs = stream();
1404 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1405 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1406 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1407 // Verify local variable table attribute has right length
1408 if (_need_verify) {
1409 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1410 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1411 }
1412 u2* localvariable_table_start = cfs->get_u2_buffer();
1413 assert(localvariable_table_start != NULL, "null local variable table");
1414 if (!_need_verify) {
1415 cfs->skip_u2_fast(size);
1416 } else {
1417 cfs->guarantee_more(size * 2, CHECK_NULL);
1418 for(int i = 0; i < (*localvariable_table_length); i++) {
1419 u2 start_pc = cfs->get_u2_fast();
1420 u2 length = cfs->get_u2_fast();
1421 u2 name_index = cfs->get_u2_fast();
1422 u2 descriptor_index = cfs->get_u2_fast();
1423 u2 index = cfs->get_u2_fast();
1424 // Assign to a u4 to avoid overflow
1425 u4 end_pc = (u4)start_pc + (u4)length;
1426
1427 if (start_pc >= code_length) {
1428 classfile_parse_error(
1429 "Invalid start_pc %u in %s in class file %s",
1430 start_pc, tbl_name, CHECK_NULL);
1431 }
1432 if (end_pc > code_length) {
1433 classfile_parse_error(
1434 "Invalid length %u in %s in class file %s",
1435 length, tbl_name, CHECK_NULL);
1436 }
1437 int cp_size = cp->length();
1438 guarantee_property(
1439 valid_cp_range(name_index, cp_size) &&
1440 cp->tag_at(name_index).is_utf8(),
1441 "Name index %u in %s has bad constant type in class file %s",
1442 name_index, tbl_name, CHECK_NULL);
1443 guarantee_property(
1444 valid_cp_range(descriptor_index, cp_size) &&
1445 cp->tag_at(descriptor_index).is_utf8(),
1446 "Signature index %u in %s has bad constant type in class file %s",
1447 descriptor_index, tbl_name, CHECK_NULL);
1448
1449 Symbol* name = cp->symbol_at(name_index);
1450 Symbol* sig = cp->symbol_at(descriptor_index);
1451 verify_legal_field_name(name, CHECK_NULL);
1452 u2 extra_slot = 0;
1453 if (!isLVTT) {
1454 verify_legal_field_signature(name, sig, CHECK_NULL);
1455
1456 // 4894874: check special cases for double and long local variables
1457 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1458 sig == vmSymbols::type_signature(T_LONG)) {
1459 extra_slot = 1;
1460 }
1461 }
1462 guarantee_property((index + extra_slot) < max_locals,
1463 "Invalid index %u in %s in class file %s",
1464 index, tbl_name, CHECK_NULL);
1465 }
1466 }
1467 return localvariable_table_start;
1468 }
1469
1470
1471 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1472 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1473 ClassFileStream* cfs = stream();
1474 u2 index = 0; // index in the array with long/double occupying two slots
1475 u4 i1 = *u1_index;
1476 u4 i2 = *u2_index + 1;
1477 for(int i = 0; i < array_length; i++) {
1478 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1479 index++;
1480 if (tag == ITEM_Long || tag == ITEM_Double) {
1481 index++;
1482 } else if (tag == ITEM_Object) {
1483 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1484 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1485 is_klass_reference(cp, class_index),
1486 "Bad class index %u in StackMap in class file %s",
1487 class_index, CHECK);
1488 } else if (tag == ITEM_Uninitialized) {
1489 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1490 guarantee_property(
1491 offset < code_length,
1492 "Bad uninitialized type offset %u in StackMap in class file %s",
1493 offset, CHECK);
1494 } else {
1495 guarantee_property(
1496 tag <= (u1)ITEM_Uninitialized,
1497 "Unknown variable type %u in StackMap in class file %s",
1498 tag, CHECK);
1499 }
1500 }
1501 u2_array[*u2_index] = index;
1502 *u1_index = i1;
1503 *u2_index = i2;
1504 }
1505
1506 typeArrayOop ClassFileParser::parse_stackmap_table(
1507 u4 code_attribute_length, TRAPS) {
1508 if (code_attribute_length == 0)
1509 return NULL;
1510
1511 ClassFileStream* cfs = stream();
1512 u1* stackmap_table_start = cfs->get_u1_buffer();
1513 assert(stackmap_table_start != NULL, "null stackmap table");
1514
1515 // check code_attribute_length first
1516 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1517
1518 if (!_need_verify && !DumpSharedSpaces) {
1519 return NULL;
1520 }
1521
1522 typeArrayOop stackmap_data =
1523 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1524
1525 stackmap_data->set_length(code_attribute_length);
1526 memcpy((void*)stackmap_data->byte_at_addr(0),
1527 (void*)stackmap_table_start, code_attribute_length);
1528 return stackmap_data;
1529 }
1530
1531 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1532 u4 method_attribute_length,
1533 constantPoolHandle cp, TRAPS) {
1534 ClassFileStream* cfs = stream();
1535 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1536 *checked_exceptions_length = cfs->get_u2_fast();
1537 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1538 u2* checked_exceptions_start = cfs->get_u2_buffer();
1539 assert(checked_exceptions_start != NULL, "null checked exceptions");
1540 if (!_need_verify) {
1541 cfs->skip_u2_fast(size);
1542 } else {
1543 // Verify each value in the checked exception table
1544 u2 checked_exception;
1545 u2 len = *checked_exceptions_length;
1546 cfs->guarantee_more(2 * len, CHECK_NULL);
1547 for (int i = 0; i < len; i++) {
1548 checked_exception = cfs->get_u2_fast();
1549 check_property(
1550 valid_cp_range(checked_exception, cp->length()) &&
1551 is_klass_reference(cp, checked_exception),
1552 "Exception name has bad type at constant pool %u in class file %s",
1553 checked_exception, CHECK_NULL);
1554 }
1555 }
1556 // check exceptions attribute length
1557 if (_need_verify) {
1558 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1559 sizeof(u2) * size),
1560 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1561 }
1562 return checked_exceptions_start;
1563 }
1564
1565 void ClassFileParser::throwIllegalSignature(
1566 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1567 ResourceMark rm(THREAD);
1568 Exceptions::fthrow(THREAD_AND_LOCATION,
1569 vmSymbols::java_lang_ClassFormatError(),
1570 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1571 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1572 }
1573
1574 #define MAX_ARGS_SIZE 255
1575 #define MAX_CODE_SIZE 65535
1576 #define INITIAL_MAX_LVT_NUMBER 256
1577
1578 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1579 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1580 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1581 // entire method attribute is parsed.
1582 //
1583 // The promoted_flags parameter is used to pass relevant access_flags
1584 // from the method back up to the containing klass. These flag values
1585 // are added to klass's access_flags.
1586
1587 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1588 AccessFlags *promoted_flags,
1589 typeArrayHandle* method_annotations,
1590 typeArrayHandle* method_parameter_annotations,
1591 typeArrayHandle* method_default_annotations,
1592 TRAPS) {
1593 ClassFileStream* cfs = stream();
1594 methodHandle nullHandle;
1595 ResourceMark rm(THREAD);
1596 // Parse fixed parts
1597 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1598
1599 int flags = cfs->get_u2_fast();
1600 u2 name_index = cfs->get_u2_fast();
1601 int cp_size = cp->length();
1602 check_property(
1603 valid_cp_range(name_index, cp_size) &&
1604 cp->tag_at(name_index).is_utf8(),
1605 "Illegal constant pool index %u for method name in class file %s",
1606 name_index, CHECK_(nullHandle));
1607 Symbol* name = cp->symbol_at(name_index);
1608 verify_legal_method_name(name, CHECK_(nullHandle));
1609
1610 u2 signature_index = cfs->get_u2_fast();
1611 guarantee_property(
1612 valid_cp_range(signature_index, cp_size) &&
1613 cp->tag_at(signature_index).is_utf8(),
1614 "Illegal constant pool index %u for method signature in class file %s",
1615 signature_index, CHECK_(nullHandle));
1616 Symbol* signature = cp->symbol_at(signature_index);
1617
1618 AccessFlags access_flags;
1619 if (name == vmSymbols::class_initializer_name()) {
1620 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1621 flags = JVM_ACC_STATIC;
1622 } else {
1623 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1624 }
1625
1626 int args_size = -1; // only used when _need_verify is true
1627 if (_need_verify) {
1628 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1629 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1630 if (args_size > MAX_ARGS_SIZE) {
1631 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1632 }
1633 }
1634
1635 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1636
1637 // Default values for code and exceptions attribute elements
1638 u2 max_stack = 0;
1639 u2 max_locals = 0;
1640 u4 code_length = 0;
1641 u1* code_start = 0;
1642 u2 exception_table_length = 0;
1643 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1644 u2 checked_exceptions_length = 0;
1645 u2* checked_exceptions_start = NULL;
1646 CompressedLineNumberWriteStream* linenumber_table = NULL;
1647 int linenumber_table_length = 0;
1648 int total_lvt_length = 0;
1649 u2 lvt_cnt = 0;
1650 u2 lvtt_cnt = 0;
1651 bool lvt_allocated = false;
1652 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1653 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1654 u2* localvariable_table_length;
1655 u2** localvariable_table_start;
1656 u2* localvariable_type_table_length;
1657 u2** localvariable_type_table_start;
1658 bool parsed_code_attribute = false;
1659 bool parsed_checked_exceptions_attribute = false;
1660 bool parsed_stackmap_attribute = false;
1661 // stackmap attribute - JDK1.5
1662 typeArrayHandle stackmap_data;
1663 u2 generic_signature_index = 0;
1664 u1* runtime_visible_annotations = NULL;
1665 int runtime_visible_annotations_length = 0;
1666 u1* runtime_invisible_annotations = NULL;
1667 int runtime_invisible_annotations_length = 0;
1668 u1* runtime_visible_parameter_annotations = NULL;
1669 int runtime_visible_parameter_annotations_length = 0;
1670 u1* runtime_invisible_parameter_annotations = NULL;
1671 int runtime_invisible_parameter_annotations_length = 0;
1672 u1* annotation_default = NULL;
1673 int annotation_default_length = 0;
1674
1675 // Parse code and exceptions attribute
1676 u2 method_attributes_count = cfs->get_u2_fast();
1677 while (method_attributes_count--) {
1678 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1679 u2 method_attribute_name_index = cfs->get_u2_fast();
1680 u4 method_attribute_length = cfs->get_u4_fast();
1681 check_property(
1682 valid_cp_range(method_attribute_name_index, cp_size) &&
1683 cp->tag_at(method_attribute_name_index).is_utf8(),
1684 "Invalid method attribute name index %u in class file %s",
1685 method_attribute_name_index, CHECK_(nullHandle));
1686
1687 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1688 if (method_attribute_name == vmSymbols::tag_code()) {
1689 // Parse Code attribute
1690 if (_need_verify) {
1691 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1692 "Code attribute in native or abstract methods in class file %s",
1693 CHECK_(nullHandle));
1694 }
1695 if (parsed_code_attribute) {
1696 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1697 }
1698 parsed_code_attribute = true;
1699
1700 // Stack size, locals size, and code size
1701 if (_major_version == 45 && _minor_version <= 2) {
1702 cfs->guarantee_more(4, CHECK_(nullHandle));
1703 max_stack = cfs->get_u1_fast();
1704 max_locals = cfs->get_u1_fast();
1705 code_length = cfs->get_u2_fast();
1706 } else {
1707 cfs->guarantee_more(8, CHECK_(nullHandle));
1708 max_stack = cfs->get_u2_fast();
1709 max_locals = cfs->get_u2_fast();
1710 code_length = cfs->get_u4_fast();
1711 }
1712 if (_need_verify) {
1713 guarantee_property(args_size <= max_locals,
1714 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1715 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1716 "Invalid method Code length %u in class file %s",
1717 code_length, CHECK_(nullHandle));
1718 }
1719 // Code pointer
1720 code_start = cfs->get_u1_buffer();
1721 assert(code_start != NULL, "null code start");
1722 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1723 cfs->skip_u1_fast(code_length);
1724
1725 // Exception handler table
1726 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1727 exception_table_length = cfs->get_u2_fast();
1728 if (exception_table_length > 0) {
1729 exception_handlers =
1730 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1731 }
1732
1733 // Parse additional attributes in code attribute
1734 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1735 u2 code_attributes_count = cfs->get_u2_fast();
1736
1737 unsigned int calculated_attribute_length = 0;
1738
1739 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1740 calculated_attribute_length =
1741 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1742 } else {
1743 // max_stack, locals and length are smaller in pre-version 45.2 classes
1744 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1745 }
1746 calculated_attribute_length +=
1747 code_length +
1748 sizeof(exception_table_length) +
1749 sizeof(code_attributes_count) +
1750 exception_table_length *
1751 ( sizeof(u2) + // start_pc
1752 sizeof(u2) + // end_pc
1753 sizeof(u2) + // handler_pc
1754 sizeof(u2) ); // catch_type_index
1755
1756 while (code_attributes_count--) {
1757 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1758 u2 code_attribute_name_index = cfs->get_u2_fast();
1759 u4 code_attribute_length = cfs->get_u4_fast();
1760 calculated_attribute_length += code_attribute_length +
1761 sizeof(code_attribute_name_index) +
1762 sizeof(code_attribute_length);
1763 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1764 cp->tag_at(code_attribute_name_index).is_utf8(),
1765 "Invalid code attribute name index %u in class file %s",
1766 code_attribute_name_index,
1767 CHECK_(nullHandle));
1768 if (LoadLineNumberTables &&
1769 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1770 // Parse and compress line number table
1771 parse_linenumber_table(code_attribute_length, code_length,
1772 &linenumber_table, CHECK_(nullHandle));
1773
1774 } else if (LoadLocalVariableTables &&
1775 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1776 // Parse local variable table
1777 if (!lvt_allocated) {
1778 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1779 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1780 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1781 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1782 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1783 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1784 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1785 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1786 lvt_allocated = true;
1787 }
1788 if (lvt_cnt == max_lvt_cnt) {
1789 max_lvt_cnt <<= 1;
1790 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1791 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1792 }
1793 localvariable_table_start[lvt_cnt] =
1794 parse_localvariable_table(code_length,
1795 max_locals,
1796 code_attribute_length,
1797 cp,
1798 &localvariable_table_length[lvt_cnt],
1799 false, // is not LVTT
1800 CHECK_(nullHandle));
1801 total_lvt_length += localvariable_table_length[lvt_cnt];
1802 lvt_cnt++;
1803 } else if (LoadLocalVariableTypeTables &&
1804 _major_version >= JAVA_1_5_VERSION &&
1805 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1806 if (!lvt_allocated) {
1807 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1808 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1809 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1810 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1811 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1812 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1813 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1814 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1815 lvt_allocated = true;
1816 }
1817 // Parse local variable type table
1818 if (lvtt_cnt == max_lvtt_cnt) {
1819 max_lvtt_cnt <<= 1;
1820 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1821 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1822 }
1823 localvariable_type_table_start[lvtt_cnt] =
1824 parse_localvariable_table(code_length,
1825 max_locals,
1826 code_attribute_length,
1827 cp,
1828 &localvariable_type_table_length[lvtt_cnt],
1829 true, // is LVTT
1830 CHECK_(nullHandle));
1831 lvtt_cnt++;
1832 } else if (UseSplitVerifier &&
1833 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1834 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1835 // Stack map is only needed by the new verifier in JDK1.5.
1836 if (parsed_stackmap_attribute) {
1837 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1838 }
1839 typeArrayOop sm =
1840 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1841 stackmap_data = typeArrayHandle(THREAD, sm);
1842 parsed_stackmap_attribute = true;
1843 } else {
1844 // Skip unknown attributes
1845 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1846 }
1847 }
1848 // check method attribute length
1849 if (_need_verify) {
1850 guarantee_property(method_attribute_length == calculated_attribute_length,
1851 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1852 }
1853 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1854 // Parse Exceptions attribute
1855 if (parsed_checked_exceptions_attribute) {
1856 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1857 }
1858 parsed_checked_exceptions_attribute = true;
1859 checked_exceptions_start =
1860 parse_checked_exceptions(&checked_exceptions_length,
1861 method_attribute_length,
1862 cp, CHECK_(nullHandle));
1863 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1864 if (method_attribute_length != 0) {
1865 classfile_parse_error(
1866 "Invalid Synthetic method attribute length %u in class file %s",
1867 method_attribute_length, CHECK_(nullHandle));
1868 }
1869 // Should we check that there hasn't already been a synthetic attribute?
1870 access_flags.set_is_synthetic();
1871 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1872 if (method_attribute_length != 0) {
1873 classfile_parse_error(
1874 "Invalid Deprecated method attribute length %u in class file %s",
1875 method_attribute_length, CHECK_(nullHandle));
1876 }
1877 } else if (_major_version >= JAVA_1_5_VERSION) {
1878 if (method_attribute_name == vmSymbols::tag_signature()) {
1879 if (method_attribute_length != 2) {
1880 classfile_parse_error(
1881 "Invalid Signature attribute length %u in class file %s",
1882 method_attribute_length, CHECK_(nullHandle));
1883 }
1884 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1885 generic_signature_index = cfs->get_u2_fast();
1886 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1887 runtime_visible_annotations_length = method_attribute_length;
1888 runtime_visible_annotations = cfs->get_u1_buffer();
1889 assert(runtime_visible_annotations != NULL, "null visible annotations");
1890 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1891 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1892 runtime_invisible_annotations_length = method_attribute_length;
1893 runtime_invisible_annotations = cfs->get_u1_buffer();
1894 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1895 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1896 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1897 runtime_visible_parameter_annotations_length = method_attribute_length;
1898 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1899 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1900 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1901 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1902 runtime_invisible_parameter_annotations_length = method_attribute_length;
1903 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1904 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1905 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1906 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1907 annotation_default_length = method_attribute_length;
1908 annotation_default = cfs->get_u1_buffer();
1909 assert(annotation_default != NULL, "null annotation default");
1910 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1911 } else {
1912 // Skip unknown attributes
1913 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1914 }
1915 } else {
1916 // Skip unknown attributes
1917 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1918 }
1919 }
1920
1921 if (linenumber_table != NULL) {
1922 linenumber_table->write_terminator();
1923 linenumber_table_length = linenumber_table->position();
1924 }
1925
1926 // Make sure there's at least one Code attribute in non-native/non-abstract method
1927 if (_need_verify) {
1928 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1929 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1930 }
1931
1932 // All sizing information for a methodOop is finally available, now create it
1933 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1934 total_lvt_length, checked_exceptions_length,
1935 oopDesc::IsSafeConc, CHECK_(nullHandle));
1936 methodHandle m (THREAD, m_oop);
1937
1938 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1939
1940 // Fill in information from fixed part (access_flags already set)
1941 m->set_constants(cp());
1942 m->set_name_index(name_index);
1943 m->set_signature_index(signature_index);
1944 m->set_generic_signature_index(generic_signature_index);
1945 #ifdef CC_INTERP
1946 // hmm is there a gc issue here??
1947 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1948 m->set_result_index(rtf.type());
1949 #endif
1950
1951 if (args_size >= 0) {
1952 m->set_size_of_parameters(args_size);
1953 } else {
1954 m->compute_size_of_parameters(THREAD);
1955 }
1956 #ifdef ASSERT
1957 if (args_size >= 0) {
1958 m->compute_size_of_parameters(THREAD);
1959 assert(args_size == m->size_of_parameters(), "");
1960 }
1961 #endif
1962
1963 // Fill in code attribute information
1964 m->set_max_stack(max_stack);
1965 m->set_max_locals(max_locals);
1966 m->constMethod()->set_stackmap_data(stackmap_data());
1967
1968 /**
1969 * The exception_table field is the flag used to indicate
1970 * that the methodOop and it's associated constMethodOop are partially
1971 * initialized and thus are exempt from pre/post GC verification. Once
1972 * the field is set, the oops are considered fully initialized so make
1973 * sure that the oops can pass verification when this field is set.
1974 */
1975 m->set_exception_table(exception_handlers());
1976
1977 // Copy byte codes
1978 m->set_code(code_start);
1979
1980 // Copy line number table
1981 if (linenumber_table != NULL) {
1982 memcpy(m->compressed_linenumber_table(),
1983 linenumber_table->buffer(), linenumber_table_length);
1984 }
1985
1986 // Copy checked exceptions
1987 if (checked_exceptions_length > 0) {
1988 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1989 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1990 }
1991
1992 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1993 *
1994 * Rules for LVT's and LVTT's are:
1995 * - There can be any number of LVT's and LVTT's.
1996 * - If there are n LVT's, it is the same as if there was just
1997 * one LVT containing all the entries from the n LVT's.
1998 * - There may be no more than one LVT entry per local variable.
1999 * Two LVT entries are 'equal' if these fields are the same:
2000 * start_pc, length, name, slot
2001 * - There may be no more than one LVTT entry per each LVT entry.
2002 * Each LVTT entry has to match some LVT entry.
2003 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2004 */
2005 if (total_lvt_length > 0) {
2006 int tbl_no, idx;
2007
2008 promoted_flags->set_has_localvariable_table();
2009
2010 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2011 initialize_hashtable(lvt_Hash);
2012
2013 // To fill LocalVariableTable in
2014 Classfile_LVT_Element* cf_lvt;
2015 LocalVariableTableElement* lvt = m->localvariable_table_start();
2016
2017 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2018 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2019 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2020 copy_lvt_element(&cf_lvt[idx], lvt);
2021 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2022 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2023 && _need_verify
2024 && _major_version >= JAVA_1_5_VERSION ) {
2025 clear_hashtable(lvt_Hash);
2026 classfile_parse_error("Duplicated LocalVariableTable attribute "
2027 "entry for '%s' in class file %s",
2028 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2029 CHECK_(nullHandle));
2030 }
2031 }
2032 }
2033
2034 // To merge LocalVariableTable and LocalVariableTypeTable
2035 Classfile_LVT_Element* cf_lvtt;
2036 LocalVariableTableElement lvtt_elem;
2037
2038 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2039 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2040 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2041 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2042 int index = hash(&lvtt_elem);
2043 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2044 if (entry == NULL) {
2045 if (_need_verify) {
2046 clear_hashtable(lvt_Hash);
2047 classfile_parse_error("LVTT entry for '%s' in class file %s "
2048 "does not match any LVT entry",
2049 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2050 CHECK_(nullHandle));
2051 }
2052 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2053 clear_hashtable(lvt_Hash);
2054 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2055 "entry for '%s' in class file %s",
2056 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2057 CHECK_(nullHandle));
2058 } else {
2059 // to add generic signatures into LocalVariableTable
2060 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2061 }
2062 }
2063 }
2064 clear_hashtable(lvt_Hash);
2065 }
2066
2067 *method_annotations = assemble_annotations(runtime_visible_annotations,
2068 runtime_visible_annotations_length,
2069 runtime_invisible_annotations,
2070 runtime_invisible_annotations_length,
2071 CHECK_(nullHandle));
2072 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2073 runtime_visible_parameter_annotations_length,
2074 runtime_invisible_parameter_annotations,
2075 runtime_invisible_parameter_annotations_length,
2076 CHECK_(nullHandle));
2077 *method_default_annotations = assemble_annotations(annotation_default,
2078 annotation_default_length,
2079 NULL,
2080 0,
2081 CHECK_(nullHandle));
2082
2083 if (name == vmSymbols::finalize_method_name() &&
2084 signature == vmSymbols::void_method_signature()) {
2085 if (m->is_empty_method()) {
2086 _has_empty_finalizer = true;
2087 } else {
2088 _has_finalizer = true;
2089 }
2090 }
2091 if (name == vmSymbols::object_initializer_name() &&
2092 signature == vmSymbols::void_method_signature() &&
2093 m->is_vanilla_constructor()) {
2094 _has_vanilla_constructor = true;
2095 }
2096
2097 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2098 m->is_method_handle_adapter())) {
2099 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2100 "Method handle invokers must be defined internally to the VM", nullHandle);
2101 }
2102
2103 return m;
2104 }
2105
2106
2107 // The promoted_flags parameter is used to pass relevant access_flags
2108 // from the methods back up to the containing klass. These flag values
2109 // are added to klass's access_flags.
2110
2111 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2112 AccessFlags* promoted_flags,
2113 bool* has_final_method,
2114 objArrayOop* methods_annotations_oop,
2115 objArrayOop* methods_parameter_annotations_oop,
2116 objArrayOop* methods_default_annotations_oop,
2117 TRAPS) {
2118 ClassFileStream* cfs = stream();
2119 objArrayHandle nullHandle;
2120 typeArrayHandle method_annotations;
2121 typeArrayHandle method_parameter_annotations;
2122 typeArrayHandle method_default_annotations;
2123 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2124 u2 length = cfs->get_u2_fast();
2125 if (length == 0) {
2126 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2127 } else {
2128 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2129 objArrayHandle methods(THREAD, m);
2130 HandleMark hm(THREAD);
2131 objArrayHandle methods_annotations;
2132 objArrayHandle methods_parameter_annotations;
2133 objArrayHandle methods_default_annotations;
2134 for (int index = 0; index < length; index++) {
2135 methodHandle method = parse_method(cp, is_interface,
2136 promoted_flags,
2137 &method_annotations,
2138 &method_parameter_annotations,
2139 &method_default_annotations,
2140 CHECK_(nullHandle));
2141 if (method->is_final()) {
2142 *has_final_method = true;
2143 }
2144 methods->obj_at_put(index, method());
2145 if (method_annotations.not_null()) {
2146 if (methods_annotations.is_null()) {
2147 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2148 methods_annotations = objArrayHandle(THREAD, md);
2149 }
2150 methods_annotations->obj_at_put(index, method_annotations());
2151 }
2152 if (method_parameter_annotations.not_null()) {
2153 if (methods_parameter_annotations.is_null()) {
2154 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2155 methods_parameter_annotations = objArrayHandle(THREAD, md);
2156 }
2157 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2158 }
2159 if (method_default_annotations.not_null()) {
2160 if (methods_default_annotations.is_null()) {
2161 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2162 methods_default_annotations = objArrayHandle(THREAD, md);
2163 }
2164 methods_default_annotations->obj_at_put(index, method_default_annotations());
2165 }
2166 }
2167 if (_need_verify && length > 1) {
2168 // Check duplicated methods
2169 ResourceMark rm(THREAD);
2170 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2171 THREAD, NameSigHash*, HASH_ROW_SIZE);
2172 initialize_hashtable(names_and_sigs);
2173 bool dup = false;
2174 {
2175 debug_only(No_Safepoint_Verifier nsv;)
2176 for (int i = 0; i < length; i++) {
2177 methodOop m = (methodOop)methods->obj_at(i);
2178 // If no duplicates, add name/signature in hashtable names_and_sigs.
2179 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2180 dup = true;
2181 break;
2182 }
2183 }
2184 }
2185 if (dup) {
2186 classfile_parse_error("Duplicate method name&signature in class file %s",
2187 CHECK_(nullHandle));
2188 }
2189 }
2190
2191 *methods_annotations_oop = methods_annotations();
2192 *methods_parameter_annotations_oop = methods_parameter_annotations();
2193 *methods_default_annotations_oop = methods_default_annotations();
2194
2195 return methods;
2196 }
2197 }
2198
2199
2200 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2201 objArrayHandle methods_annotations,
2202 objArrayHandle methods_parameter_annotations,
2203 objArrayHandle methods_default_annotations,
2204 TRAPS) {
2205 typeArrayHandle nullHandle;
2206 int length = methods()->length();
2207 // If JVMTI original method ordering is enabled we have to
2208 // remember the original class file ordering.
2209 // We temporarily use the vtable_index field in the methodOop to store the
2210 // class file index, so we can read in after calling qsort.
2211 if (JvmtiExport::can_maintain_original_method_order()) {
2212 for (int index = 0; index < length; index++) {
2213 methodOop m = methodOop(methods->obj_at(index));
2214 assert(!m->valid_vtable_index(), "vtable index should not be set");
2215 m->set_vtable_index(index);
2216 }
2217 }
2218 // Sort method array by ascending method name (for faster lookups & vtable construction)
2219 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2220 methodOopDesc::sort_methods(methods(),
2221 methods_annotations(),
2222 methods_parameter_annotations(),
2223 methods_default_annotations());
2224
2225 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2226 if (JvmtiExport::can_maintain_original_method_order()) {
2227 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2228 typeArrayHandle method_ordering(THREAD, new_ordering);
2229 for (int index = 0; index < length; index++) {
2230 methodOop m = methodOop(methods->obj_at(index));
2231 int old_index = m->vtable_index();
2232 assert(old_index >= 0 && old_index < length, "invalid method index");
2233 method_ordering->int_at_put(index, old_index);
2234 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2235 }
2236 return method_ordering;
2237 } else {
2238 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2239 }
2240 }
2241
2242
2243 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2244 ClassFileStream* cfs = stream();
2245 cfs->guarantee_more(2, CHECK); // sourcefile_index
2246 u2 sourcefile_index = cfs->get_u2_fast();
2247 check_property(
2248 valid_cp_range(sourcefile_index, cp->length()) &&
2249 cp->tag_at(sourcefile_index).is_utf8(),
2250 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2251 sourcefile_index, CHECK);
2252 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2253 }
2254
2255
2256
2257 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2258 instanceKlassHandle k,
2259 int length, TRAPS) {
2260 ClassFileStream* cfs = stream();
2261 u1* sde_buffer = cfs->get_u1_buffer();
2262 assert(sde_buffer != NULL, "null sde buffer");
2263
2264 // Don't bother storing it if there is no way to retrieve it
2265 if (JvmtiExport::can_get_source_debug_extension()) {
2266 // Optimistically assume that only 1 byte UTF format is used
2267 // (common case)
2268 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2269 k->set_source_debug_extension(sde_symbol);
2270 // Note that set_source_debug_extension() increments the reference count
2271 // for its copy of the Symbol*, so use a TempNewSymbol here.
2272 }
2273 // Got utf8 string, set stream position forward
2274 cfs->skip_u1(length, CHECK);
2275 }
2276
2277
2278 // Inner classes can be static, private or protected (classic VM does this)
2279 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2280
2281 // Return number of classes in the inner classes attribute table
2282 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2283 ClassFileStream* cfs = stream();
2284 cfs->guarantee_more(2, CHECK_0); // length
2285 u2 length = cfs->get_u2_fast();
2286
2287 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2288 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2289 typeArrayHandle inner_classes(THREAD, ic);
2290 int index = 0;
2291 int cp_size = cp->length();
2292 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2293 for (int n = 0; n < length; n++) {
2294 // Inner class index
2295 u2 inner_class_info_index = cfs->get_u2_fast();
2296 check_property(
2297 inner_class_info_index == 0 ||
2298 (valid_cp_range(inner_class_info_index, cp_size) &&
2299 is_klass_reference(cp, inner_class_info_index)),
2300 "inner_class_info_index %u has bad constant type in class file %s",
2301 inner_class_info_index, CHECK_0);
2302 // Outer class index
2303 u2 outer_class_info_index = cfs->get_u2_fast();
2304 check_property(
2305 outer_class_info_index == 0 ||
2306 (valid_cp_range(outer_class_info_index, cp_size) &&
2307 is_klass_reference(cp, outer_class_info_index)),
2308 "outer_class_info_index %u has bad constant type in class file %s",
2309 outer_class_info_index, CHECK_0);
2310 // Inner class name
2311 u2 inner_name_index = cfs->get_u2_fast();
2312 check_property(
2313 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2314 cp->tag_at(inner_name_index).is_utf8()),
2315 "inner_name_index %u has bad constant type in class file %s",
2316 inner_name_index, CHECK_0);
2317 if (_need_verify) {
2318 guarantee_property(inner_class_info_index != outer_class_info_index,
2319 "Class is both outer and inner class in class file %s", CHECK_0);
2320 }
2321 // Access flags
2322 AccessFlags inner_access_flags;
2323 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2324 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2325 // Set abstract bit for old class files for backward compatibility
2326 flags |= JVM_ACC_ABSTRACT;
2327 }
2328 verify_legal_class_modifiers(flags, CHECK_0);
2329 inner_access_flags.set_flags(flags);
2330
2331 inner_classes->short_at_put(index++, inner_class_info_index);
2332 inner_classes->short_at_put(index++, outer_class_info_index);
2333 inner_classes->short_at_put(index++, inner_name_index);
2334 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2335 }
2336
2337 // 4347400: make sure there's no duplicate entry in the classes array
2338 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2339 for(int i = 0; i < inner_classes->length(); i += 4) {
2340 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2341 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2342 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2343 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2344 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2345 "Duplicate entry in InnerClasses in class file %s",
2346 CHECK_0);
2347 }
2348 }
2349 }
2350
2351 // Update instanceKlass with inner class info.
2352 k->set_inner_classes(inner_classes());
2353 return length;
2354 }
2355
2356 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2357 k->set_is_synthetic();
2358 }
2359
2360 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2361 ClassFileStream* cfs = stream();
2362 u2 signature_index = cfs->get_u2(CHECK);
2363 check_property(
2364 valid_cp_range(signature_index, cp->length()) &&
2365 cp->tag_at(signature_index).is_utf8(),
2366 "Invalid constant pool index %u in Signature attribute in class file %s",
2367 signature_index, CHECK);
2368 k->set_generic_signature(cp->symbol_at(signature_index));
2369 }
2370
2371 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2372 u4 attribute_byte_length, TRAPS) {
2373 ClassFileStream* cfs = stream();
2374 u1* current_start = cfs->current();
2375
2376 cfs->guarantee_more(2, CHECK); // length
2377 int attribute_array_length = cfs->get_u2_fast();
2378
2379 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2380 "Short length on BootstrapMethods in class file %s",
2381 CHECK);
2382
2383 // The attribute contains a counted array of counted tuples of shorts,
2384 // represending bootstrap specifiers:
2385 // length*{bootstrap_method_index, argument_count*{argument_index}}
2386 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2387 // operand_count = number of shorts in attr, except for leading length
2388
2389 // The attribute is copied into a short[] array.
2390 // The array begins with a series of short[2] pairs, one for each tuple.
2391 int index_size = (attribute_array_length * 2);
2392
2393 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2394 typeArrayHandle operands(THREAD, operands_oop);
2395 operands_oop = NULL; // tidy
2396
2397 int operand_fill_index = index_size;
2398 int cp_size = cp->length();
2399
2400 for (int n = 0; n < attribute_array_length; n++) {
2401 // Store a 32-bit offset into the header of the operand array.
2402 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2403 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2404
2405 // Read a bootstrap specifier.
2406 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2407 u2 bootstrap_method_index = cfs->get_u2_fast();
2408 u2 argument_count = cfs->get_u2_fast();
2409 check_property(
2410 valid_cp_range(bootstrap_method_index, cp_size) &&
2411 cp->tag_at(bootstrap_method_index).is_method_handle(),
2412 "bootstrap_method_index %u has bad constant type in class file %s",
2413 bootstrap_method_index,
2414 CHECK);
2415 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2416 operands->short_at_put(operand_fill_index++, argument_count);
2417
2418 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2419 for (int j = 0; j < argument_count; j++) {
2420 u2 argument_index = cfs->get_u2_fast();
2421 check_property(
2422 valid_cp_range(argument_index, cp_size) &&
2423 cp->tag_at(argument_index).is_loadable_constant(),
2424 "argument_index %u has bad constant type in class file %s",
2425 argument_index,
2426 CHECK);
2427 operands->short_at_put(operand_fill_index++, argument_index);
2428 }
2429 }
2430
2431 assert(operand_fill_index == operands()->length(), "exact fill");
2432 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2433
2434 u1* current_end = cfs->current();
2435 guarantee_property(current_end == current_start + attribute_byte_length,
2436 "Bad length on BootstrapMethods in class file %s",
2437 CHECK);
2438
2439 cp->set_operands(operands());
2440 }
2441
2442
2443 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2444 ClassFileStream* cfs = stream();
2445 // Set inner classes attribute to default sentinel
2446 k->set_inner_classes(Universe::the_empty_short_array());
2447 cfs->guarantee_more(2, CHECK); // attributes_count
2448 u2 attributes_count = cfs->get_u2_fast();
2449 bool parsed_sourcefile_attribute = false;
2450 bool parsed_innerclasses_attribute = false;
2451 bool parsed_enclosingmethod_attribute = false;
2452 bool parsed_bootstrap_methods_attribute = false;
2453 u1* runtime_visible_annotations = NULL;
2454 int runtime_visible_annotations_length = 0;
2455 u1* runtime_invisible_annotations = NULL;
2456 int runtime_invisible_annotations_length = 0;
2457 // Iterate over attributes
2458 while (attributes_count--) {
2459 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2460 u2 attribute_name_index = cfs->get_u2_fast();
2461 u4 attribute_length = cfs->get_u4_fast();
2462 check_property(
2463 valid_cp_range(attribute_name_index, cp->length()) &&
2464 cp->tag_at(attribute_name_index).is_utf8(),
2465 "Attribute name has bad constant pool index %u in class file %s",
2466 attribute_name_index, CHECK);
2467 Symbol* tag = cp->symbol_at(attribute_name_index);
2468 if (tag == vmSymbols::tag_source_file()) {
2469 // Check for SourceFile tag
2470 if (_need_verify) {
2471 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2472 }
2473 if (parsed_sourcefile_attribute) {
2474 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2475 } else {
2476 parsed_sourcefile_attribute = true;
2477 }
2478 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2479 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2480 // Check for SourceDebugExtension tag
2481 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2482 } else if (tag == vmSymbols::tag_inner_classes()) {
2483 // Check for InnerClasses tag
2484 if (parsed_innerclasses_attribute) {
2485 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2486 } else {
2487 parsed_innerclasses_attribute = true;
2488 }
2489 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2490 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2491 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2492 "Wrong InnerClasses attribute length in class file %s", CHECK);
2493 }
2494 } else if (tag == vmSymbols::tag_synthetic()) {
2495 // Check for Synthetic tag
2496 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2497 if (attribute_length != 0) {
2498 classfile_parse_error(
2499 "Invalid Synthetic classfile attribute length %u in class file %s",
2500 attribute_length, CHECK);
2501 }
2502 parse_classfile_synthetic_attribute(cp, k, CHECK);
2503 } else if (tag == vmSymbols::tag_deprecated()) {
2504 // Check for Deprecatd tag - 4276120
2505 if (attribute_length != 0) {
2506 classfile_parse_error(
2507 "Invalid Deprecated classfile attribute length %u in class file %s",
2508 attribute_length, CHECK);
2509 }
2510 } else if (_major_version >= JAVA_1_5_VERSION) {
2511 if (tag == vmSymbols::tag_signature()) {
2512 if (attribute_length != 2) {
2513 classfile_parse_error(
2514 "Wrong Signature attribute length %u in class file %s",
2515 attribute_length, CHECK);
2516 }
2517 parse_classfile_signature_attribute(cp, k, CHECK);
2518 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2519 runtime_visible_annotations_length = attribute_length;
2520 runtime_visible_annotations = cfs->get_u1_buffer();
2521 assert(runtime_visible_annotations != NULL, "null visible annotations");
2522 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2523 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2524 runtime_invisible_annotations_length = attribute_length;
2525 runtime_invisible_annotations = cfs->get_u1_buffer();
2526 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2527 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2528 } else if (tag == vmSymbols::tag_enclosing_method()) {
2529 if (parsed_enclosingmethod_attribute) {
2530 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2531 } else {
2532 parsed_enclosingmethod_attribute = true;
2533 }
2534 cfs->guarantee_more(4, CHECK); // class_index, method_index
2535 u2 class_index = cfs->get_u2_fast();
2536 u2 method_index = cfs->get_u2_fast();
2537 if (class_index == 0) {
2538 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2539 }
2540 // Validate the constant pool indices and types
2541 if (!cp->is_within_bounds(class_index) ||
2542 !is_klass_reference(cp, class_index)) {
2543 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2544 }
2545 if (method_index != 0 &&
2546 (!cp->is_within_bounds(method_index) ||
2547 !cp->tag_at(method_index).is_name_and_type())) {
2548 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2549 }
2550 k->set_enclosing_method_indices(class_index, method_index);
2551 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2552 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2553 if (parsed_bootstrap_methods_attribute)
2554 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2555 parsed_bootstrap_methods_attribute = true;
2556 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2557 } else {
2558 // Unknown attribute
2559 cfs->skip_u1(attribute_length, CHECK);
2560 }
2561 } else {
2562 // Unknown attribute
2563 cfs->skip_u1(attribute_length, CHECK);
2564 }
2565 }
2566 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2567 runtime_visible_annotations_length,
2568 runtime_invisible_annotations,
2569 runtime_invisible_annotations_length,
2570 CHECK);
2571 k->set_class_annotations(annotations());
2572
2573 if (_max_bootstrap_specifier_index >= 0) {
2574 guarantee_property(parsed_bootstrap_methods_attribute,
2575 "Missing BootstrapMethods attribute in class file %s", CHECK);
2576 }
2577 }
2578
2579
2580 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2581 int runtime_visible_annotations_length,
2582 u1* runtime_invisible_annotations,
2583 int runtime_invisible_annotations_length, TRAPS) {
2584 typeArrayHandle annotations;
2585 if (runtime_visible_annotations != NULL ||
2586 runtime_invisible_annotations != NULL) {
2587 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2588 runtime_invisible_annotations_length, CHECK_(annotations));
2589 annotations = typeArrayHandle(THREAD, anno);
2590 if (runtime_visible_annotations != NULL) {
2591 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2592 }
2593 if (runtime_invisible_annotations != NULL) {
2594 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2595 }
2596 }
2597 return annotations;
2598 }
2599
2600
2601 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2602 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2603 // This code is for compatibility with earlier jdk's that do not
2604 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2605 // the check for the "discovered" field should issue a warning if
2606 // the field is not found. For 1.6 this code should be issue a
2607 // fatal error if the "discovered" field is not found.
2608 //
2609 // Increment fac.nonstatic_oop_count so that the start of the
2610 // next type of non-static oops leaves room for the fake oop.
2611 // Do not increment next_nonstatic_oop_offset so that the
2612 // fake oop is place after the java.lang.ref.Reference oop
2613 // fields.
2614 //
2615 // Check the fields in java.lang.ref.Reference for the "discovered"
2616 // field. If it is not present, artifically create a field for it.
2617 // This allows this VM to run on early JDK where the field is not
2618 // present.
2619 int reference_sig_index = 0;
2620 int reference_name_index = 0;
2621 int reference_index = 0;
2622 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2623 const int n = (*fields_ptr)()->length();
2624 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2625 int name_index =
2626 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2627 int sig_index =
2628 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2629 Symbol* f_name = cp->symbol_at(name_index);
2630 Symbol* f_sig = cp->symbol_at(sig_index);
2631 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2632 // Save the index for reference signature for later use.
2633 // The fake discovered field does not entries in the
2634 // constant pool so the index for its signature cannot
2635 // be extracted from the constant pool. It will need
2636 // later, however. It's signature is vmSymbols::reference_signature()
2637 // so same an index for that signature.
2638 reference_sig_index = sig_index;
2639 reference_name_index = name_index;
2640 reference_index = i;
2641 }
2642 if (f_name == vmSymbols::reference_discovered_name() &&
2643 f_sig == vmSymbols::reference_signature()) {
2644 // The values below are fake but will force extra
2645 // non-static oop fields and a corresponding non-static
2646 // oop map block to be allocated.
2647 extra = 0;
2648 break;
2649 }
2650 }
2651 if (extra != 0) {
2652 fac_ptr->nonstatic_oop_count += extra;
2653 // Add the additional entry to "fields" so that the klass
2654 // contains the "discoverd" field and the field will be initialized
2655 // in instances of the object.
2656 int fields_with_fix_length = (*fields_ptr)()->length() +
2657 instanceKlass::next_offset;
2658 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2659 fields_with_fix_length, CHECK);
2660 typeArrayHandle fields_with_fix(THREAD, ff);
2661
2662 // Take everything from the original but the length.
2663 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2664 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2665 }
2666
2667 // Add the fake field at the end.
2668 int i = (*fields_ptr)->length();
2669 // There is no name index for the fake "discovered" field nor
2670 // signature but a signature is needed so that the field will
2671 // be properly initialized. Use one found for
2672 // one of the other reference fields. Be sure the index for the
2673 // name is 0. In fieldDescriptor::initialize() the index of the
2674 // name is checked. That check is by passed for the last nonstatic
2675 // oop field in a java.lang.ref.Reference which is assumed to be
2676 // this artificial "discovered" field. An assertion checks that
2677 // the name index is 0.
2678 assert(reference_index != 0, "Missing signature for reference");
2679
2680 int j;
2681 for (j = 0; j < instanceKlass::next_offset; j++) {
2682 fields_with_fix->ushort_at_put(i + j,
2683 (*fields_ptr)->ushort_at(reference_index +j));
2684 }
2685 // Clear the public access flag and set the private access flag.
2686 short flags;
2687 flags =
2688 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2689 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2690 flags = flags & (~JVM_ACC_PUBLIC);
2691 flags = flags | JVM_ACC_PRIVATE;
2692 AccessFlags access_flags;
2693 access_flags.set_flags(flags);
2694 assert(!access_flags.is_public(), "Failed to clear public flag");
2695 assert(access_flags.is_private(), "Failed to set private flag");
2696 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2697 flags);
2698
2699 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2700 == reference_name_index, "The fake reference name is incorrect");
2701 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2702 == reference_sig_index, "The fake reference signature is incorrect");
2703 // The type of the field is stored in the low_offset entry during
2704 // parsing.
2705 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2706 NONSTATIC_OOP, "The fake reference type is incorrect");
2707
2708 // "fields" is allocated in the permanent generation. Disgard
2709 // it and let it be collected.
2710 (*fields_ptr) = fields_with_fix;
2711 }
2712 return;
2713 }
2714
2715
2716 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2717 FieldAllocationCount *fac_ptr, TRAPS) {
2718 // Add fake fields for java.lang.Class instances
2719 //
2720 // This is not particularly nice. We should consider adding a
2721 // private transient object field at the Java level to
2722 // java.lang.Class. Alternatively we could add a subclass of
2723 // instanceKlass which provides an accessor and size computer for
2724 // this field, but that appears to be more code than this hack.
2725 //
2726 // NOTE that we wedge these in at the beginning rather than the
2727 // end of the object because the Class layout changed between JDK
2728 // 1.3 and JDK 1.4 with the new reflection implementation; some
2729 // nonstatic oop fields were added at the Java level. The offsets
2730 // of these fake fields can't change between these two JDK
2731 // versions because when the offsets are computed at bootstrap
2732 // time we don't know yet which version of the JDK we're running in.
2733
2734 // The values below are fake but will force two non-static oop fields and
2735 // a corresponding non-static oop map block to be allocated.
2736 const int extra = java_lang_Class::number_of_fake_oop_fields;
2737 fac_ptr->nonstatic_oop_count += extra;
2738 fac_ptr->nonstatic_word_count += java_lang_Class::hc_number_of_fake_int_fields;
2739 }
2740
2741
2742 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2743 // Cause the extra fake fields in java.lang.Class to show up before
2744 // the Java fields for layout compatibility between 1.3 and 1.4
2745 // Incrementing next_nonstatic_oop_offset here advances the
2746 // location where the real java fields are placed.
2747 const int extra = java_lang_Class::number_of_fake_oop_fields;
2748 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2749 }
2750
2751
2752 // Force MethodHandle.vmentry to be an unmanaged pointer.
2753 // There is no way for a classfile to express this, so we must help it.
2754 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2755 typeArrayHandle fields,
2756 FieldAllocationCount *fac_ptr,
2757 TRAPS) {
2758 // Add fake fields for java.dyn.MethodHandle instances
2759 //
2760 // This is not particularly nice, but since there is no way to express
2761 // a native wordSize field in Java, we must do it at this level.
2762
2763 if (!EnableMethodHandles) return;
2764
2765 int word_sig_index = 0;
2766 const int cp_size = cp->length();
2767 for (int index = 1; index < cp_size; index++) {
2768 if (cp->tag_at(index).is_utf8() &&
2769 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2770 word_sig_index = index;
2771 break;
2772 }
2773 }
2774
2775 if (word_sig_index == 0)
2776 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2777 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2778
2779 // Find vmentry field and change the signature.
2780 bool found_vmentry = false;
2781 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) {
2782 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
2783 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
2784 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset);
2785 Symbol* f_name = cp->symbol_at(name_index);
2786 Symbol* f_sig = cp->symbol_at(sig_index);
2787 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) {
2788 if (f_sig == vmSymbols::machine_word_signature()) {
2789 // If the signature of vmentry is already changed, we're done.
2790 found_vmentry = true;
2791 break;
2792 }
2793 else if (f_sig == vmSymbols::byte_signature()) {
2794 // Adjust the field type from byte to an unmanaged pointer.
2795 assert(fac_ptr->nonstatic_byte_count > 0, "");
2796 fac_ptr->nonstatic_byte_count -= 1;
2797
2798 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2799 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2800 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2801 else fac_ptr->nonstatic_word_count += 1;
2802
2803 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
2804 assert(atype == NONSTATIC_BYTE, "");
2805 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2806 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2807
2808 found_vmentry = true;
2809 break;
2810 }
2811 }
2812 }
2813
2814 if (!found_vmentry)
2815 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2816 "missing vmentry byte field in java.dyn.MethodHandle");
2817 }
2818
2819
2820 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2821 Handle class_loader,
2822 Handle protection_domain,
2823 KlassHandle host_klass,
2824 GrowableArray<Handle>* cp_patches,
2825 TempNewSymbol& parsed_name,
2826 bool verify,
2827 TRAPS) {
2828 // So that JVMTI can cache class file in the state before retransformable agents
2829 // have modified it
2830 unsigned char *cached_class_file_bytes = NULL;
2831 jint cached_class_file_length;
2832
2833 ClassFileStream* cfs = stream();
2834 // Timing
2835 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2836 JavaThread* jt = (JavaThread*) THREAD;
2837
2838 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2839 ClassLoader::perf_class_parse_selftime(),
2840 NULL,
2841 jt->get_thread_stat()->perf_recursion_counts_addr(),
2842 jt->get_thread_stat()->perf_timers_addr(),
2843 PerfClassTraceTime::PARSE_CLASS);
2844
2845 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2846 _max_bootstrap_specifier_index = -1;
2847
2848 if (JvmtiExport::should_post_class_file_load_hook()) {
2849 unsigned char* ptr = cfs->buffer();
2850 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2851
2852 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2853 &ptr, &end_ptr,
2854 &cached_class_file_bytes,
2855 &cached_class_file_length);
2856
2857 if (ptr != cfs->buffer()) {
2858 // JVMTI agent has modified class file data.
2859 // Set new class file stream using JVMTI agent modified
2860 // class file data.
2861 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2862 set_stream(cfs);
2863 }
2864 }
2865
2866 _host_klass = host_klass;
2867 _cp_patches = cp_patches;
2868
2869 instanceKlassHandle nullHandle;
2870
2871 // Figure out whether we can skip format checking (matching classic VM behavior)
2872 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2873
2874 // Set the verify flag in stream
2875 cfs->set_verify(_need_verify);
2876
2877 // Save the class file name for easier error message printing.
2878 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2879
2880 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2881 // Magic value
2882 u4 magic = cfs->get_u4_fast();
2883 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2884 "Incompatible magic value %u in class file %s",
2885 magic, CHECK_(nullHandle));
2886
2887 // Version numbers
2888 u2 minor_version = cfs->get_u2_fast();
2889 u2 major_version = cfs->get_u2_fast();
2890
2891 // Check version numbers - we check this even with verifier off
2892 if (!is_supported_version(major_version, minor_version)) {
2893 if (name == NULL) {
2894 Exceptions::fthrow(
2895 THREAD_AND_LOCATION,
2896 vmSymbols::java_lang_UnsupportedClassVersionError(),
2897 "Unsupported major.minor version %u.%u",
2898 major_version,
2899 minor_version);
2900 } else {
2901 ResourceMark rm(THREAD);
2902 Exceptions::fthrow(
2903 THREAD_AND_LOCATION,
2904 vmSymbols::java_lang_UnsupportedClassVersionError(),
2905 "%s : Unsupported major.minor version %u.%u",
2906 name->as_C_string(),
2907 major_version,
2908 minor_version);
2909 }
2910 return nullHandle;
2911 }
2912
2913 _major_version = major_version;
2914 _minor_version = minor_version;
2915
2916
2917 // Check if verification needs to be relaxed for this class file
2918 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2919 _relax_verify = Verifier::relax_verify_for(class_loader());
2920
2921 // Constant pool
2922 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2923 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2924
2925 int cp_size = cp->length();
2926
2927 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2928
2929 // Access flags
2930 AccessFlags access_flags;
2931 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2932
2933 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2934 // Set abstract bit for old class files for backward compatibility
2935 flags |= JVM_ACC_ABSTRACT;
2936 }
2937 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2938 access_flags.set_flags(flags);
2939
2940 // This class and superclass
2941 instanceKlassHandle super_klass;
2942 u2 this_class_index = cfs->get_u2_fast();
2943 check_property(
2944 valid_cp_range(this_class_index, cp_size) &&
2945 cp->tag_at(this_class_index).is_unresolved_klass(),
2946 "Invalid this class index %u in constant pool in class file %s",
2947 this_class_index, CHECK_(nullHandle));
2948
2949 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2950 assert(class_name != NULL, "class_name can't be null");
2951
2952 // It's important to set parsed_name *before* resolving the super class.
2953 // (it's used for cleanup by the caller if parsing fails)
2954 parsed_name = class_name;
2955 // parsed_name is returned and can be used if there's an error, so add to
2956 // its reference count. Caller will decrement the refcount.
2957 parsed_name->increment_refcount();
2958
2959 // Update _class_name which could be null previously to be class_name
2960 _class_name = class_name;
2961
2962 // Don't need to check whether this class name is legal or not.
2963 // It has been checked when constant pool is parsed.
2964 // However, make sure it is not an array type.
2965 if (_need_verify) {
2966 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2967 "Bad class name in class file %s",
2968 CHECK_(nullHandle));
2969 }
2970
2971 klassOop preserve_this_klass; // for storing result across HandleMark
2972
2973 // release all handles when parsing is done
2974 { HandleMark hm(THREAD);
2975
2976 // Checks if name in class file matches requested name
2977 if (name != NULL && class_name != name) {
2978 ResourceMark rm(THREAD);
2979 Exceptions::fthrow(
2980 THREAD_AND_LOCATION,
2981 vmSymbols::java_lang_NoClassDefFoundError(),
2982 "%s (wrong name: %s)",
2983 name->as_C_string(),
2984 class_name->as_C_string()
2985 );
2986 return nullHandle;
2987 }
2988
2989 if (TraceClassLoadingPreorder) {
2990 tty->print("[Loading %s", name->as_klass_external_name());
2991 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2992 tty->print_cr("]");
2993 }
2994
2995 u2 super_class_index = cfs->get_u2_fast();
2996 if (super_class_index == 0) {
2997 check_property(class_name == vmSymbols::java_lang_Object(),
2998 "Invalid superclass index %u in class file %s",
2999 super_class_index,
3000 CHECK_(nullHandle));
3001 } else {
3002 check_property(valid_cp_range(super_class_index, cp_size) &&
3003 is_klass_reference(cp, super_class_index),
3004 "Invalid superclass index %u in class file %s",
3005 super_class_index,
3006 CHECK_(nullHandle));
3007 // The class name should be legal because it is checked when parsing constant pool.
3008 // However, make sure it is not an array type.
3009 bool is_array = false;
3010 if (cp->tag_at(super_class_index).is_klass()) {
3011 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3012 if (_need_verify)
3013 is_array = super_klass->oop_is_array();
3014 } else if (_need_verify) {
3015 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3016 }
3017 if (_need_verify) {
3018 guarantee_property(!is_array,
3019 "Bad superclass name in class file %s", CHECK_(nullHandle));
3020 }
3021 }
3022
3023 // Interfaces
3024 u2 itfs_len = cfs->get_u2_fast();
3025 objArrayHandle local_interfaces;
3026 if (itfs_len == 0) {
3027 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3028 } else {
3029 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3030 }
3031
3032 // Fields (offsets are filled in later)
3033 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
3034 objArrayHandle fields_annotations;
3035 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
3036 // Methods
3037 bool has_final_method = false;
3038 AccessFlags promoted_flags;
3039 promoted_flags.set_flags(0);
3040 // These need to be oop pointers because they are allocated lazily
3041 // inside parse_methods inside a nested HandleMark
3042 objArrayOop methods_annotations_oop = NULL;
3043 objArrayOop methods_parameter_annotations_oop = NULL;
3044 objArrayOop methods_default_annotations_oop = NULL;
3045 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3046 &promoted_flags,
3047 &has_final_method,
3048 &methods_annotations_oop,
3049 &methods_parameter_annotations_oop,
3050 &methods_default_annotations_oop,
3051 CHECK_(nullHandle));
3052
3053 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3054 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3055 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3056
3057 // We check super class after class file is parsed and format is checked
3058 if (super_class_index > 0 && super_klass.is_null()) {
3059 Symbol* sk = cp->klass_name_at(super_class_index);
3060 if (access_flags.is_interface()) {
3061 // Before attempting to resolve the superclass, check for class format
3062 // errors not checked yet.
3063 guarantee_property(sk == vmSymbols::java_lang_Object(),
3064 "Interfaces must have java.lang.Object as superclass in class file %s",
3065 CHECK_(nullHandle));
3066 }
3067 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3068 sk,
3069 class_loader,
3070 protection_domain,
3071 true,
3072 CHECK_(nullHandle));
3073
3074 KlassHandle kh (THREAD, k);
3075 super_klass = instanceKlassHandle(THREAD, kh());
3076 if (LinkWellKnownClasses) // my super class is well known to me
3077 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3078 }
3079 if (super_klass.not_null()) {
3080 if (super_klass->is_interface()) {
3081 ResourceMark rm(THREAD);
3082 Exceptions::fthrow(
3083 THREAD_AND_LOCATION,
3084 vmSymbols::java_lang_IncompatibleClassChangeError(),
3085 "class %s has interface %s as super class",
3086 class_name->as_klass_external_name(),
3087 super_klass->external_name()
3088 );
3089 return nullHandle;
3090 }
3091 // Make sure super class is not final
3092 if (super_klass->is_final()) {
3093 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3094 }
3095 }
3096
3097 // Compute the transitive list of all unique interfaces implemented by this class
3098 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3099
3100 // sort methods
3101 typeArrayHandle method_ordering = sort_methods(methods,
3102 methods_annotations,
3103 methods_parameter_annotations,
3104 methods_default_annotations,
3105 CHECK_(nullHandle));
3106
3107 // promote flags from parse_methods() to the klass' flags
3108 access_flags.add_promoted_flags(promoted_flags.as_int());
3109
3110 // Size of Java vtable (in words)
3111 int vtable_size = 0;
3112 int itable_size = 0;
3113 int num_miranda_methods = 0;
3114
3115 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3116 num_miranda_methods,
3117 super_klass(),
3118 methods(),
3119 access_flags,
3120 class_loader,
3121 class_name,
3122 local_interfaces(),
3123 CHECK_(nullHandle));
3124
3125 // Size of Java itable (in words)
3126 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3127
3128 // Field size and offset computation
3129 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3130 #ifndef PRODUCT
3131 int orig_nonstatic_field_size = 0;
3132 #endif
3133 int static_field_size = 0;
3134 int next_static_oop_offset;
3135 int next_static_double_offset;
3136 int next_static_word_offset;
3137 int next_static_short_offset;
3138 int next_static_byte_offset;
3139 int next_static_type_offset;
3140 int next_nonstatic_oop_offset;
3141 int next_nonstatic_double_offset;
3142 int next_nonstatic_word_offset;
3143 int next_nonstatic_short_offset;
3144 int next_nonstatic_byte_offset;
3145 int next_nonstatic_type_offset;
3146 int first_nonstatic_oop_offset;
3147 int first_nonstatic_field_offset;
3148 int next_nonstatic_field_offset;
3149
3150 // Calculate the starting byte offsets
3151 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3152 next_static_double_offset = next_static_oop_offset +
3153 (fac.static_oop_count * heapOopSize);
3154 if ( fac.static_double_count &&
3155 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3156 Universe::field_type_should_be_aligned(T_LONG)) ) {
3157 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3158 }
3159
3160 next_static_word_offset = next_static_double_offset +
3161 (fac.static_double_count * BytesPerLong);
3162 next_static_short_offset = next_static_word_offset +
3163 (fac.static_word_count * BytesPerInt);
3164 next_static_byte_offset = next_static_short_offset +
3165 (fac.static_short_count * BytesPerShort);
3166 next_static_type_offset = align_size_up((next_static_byte_offset +
3167 fac.static_byte_count ), wordSize );
3168 static_field_size = (next_static_type_offset -
3169 next_static_oop_offset) / wordSize;
3170 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3171 nonstatic_field_size * heapOopSize;
3172 next_nonstatic_field_offset = first_nonstatic_field_offset;
3173
3174 // Add fake fields for java.lang.Class instances (also see below)
3175 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3176 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3177 }
3178
3179 // adjust the vmentry field declaration in java.dyn.MethodHandle
3180 if (EnableMethodHandles && class_name == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3181 java_dyn_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3182 }
3183
3184 // Add a fake "discovered" field if it is not present
3185 // for compatibility with earlier jdk's.
3186 if (class_name == vmSymbols::java_lang_ref_Reference()
3187 && class_loader.is_null()) {
3188 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3189 }
3190 // end of "discovered" field compactibility fix
3191
3192 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3193 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3194 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3195 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3196 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3197
3198 bool super_has_nonstatic_fields =
3199 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3200 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3201 ((nonstatic_double_count + nonstatic_word_count +
3202 nonstatic_short_count + nonstatic_byte_count +
3203 nonstatic_oop_count) != 0);
3204
3205
3206 // Prepare list of oops for oop map generation.
3207 int* nonstatic_oop_offsets;
3208 unsigned int* nonstatic_oop_counts;
3209 unsigned int nonstatic_oop_map_count = 0;
3210
3211 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3212 THREAD, int, nonstatic_oop_count + 1);
3213 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3214 THREAD, unsigned int, nonstatic_oop_count + 1);
3215
3216 // Add fake fields for java.lang.Class instances (also see above).
3217 // FieldsAllocationStyle and CompactFields values will be reset to default.
3218 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3219 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3220 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3221 const uint fake_oop_count = (next_nonstatic_field_offset -
3222 first_nonstatic_field_offset) / heapOopSize;
3223 nonstatic_oop_counts[0] = fake_oop_count;
3224 nonstatic_oop_map_count = 1;
3225 nonstatic_oop_count -= fake_oop_count;
3226 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3227 } else {
3228 first_nonstatic_oop_offset = 0; // will be set for first oop field
3229 }
3230
3231 #ifndef PRODUCT
3232 if( PrintCompactFieldsSavings ) {
3233 next_nonstatic_double_offset = next_nonstatic_field_offset +
3234 (nonstatic_oop_count * heapOopSize);
3235 if ( nonstatic_double_count > 0 ) {
3236 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3237 }
3238 next_nonstatic_word_offset = next_nonstatic_double_offset +
3239 (nonstatic_double_count * BytesPerLong);
3240 next_nonstatic_short_offset = next_nonstatic_word_offset +
3241 (nonstatic_word_count * BytesPerInt);
3242 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3243 (nonstatic_short_count * BytesPerShort);
3244 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3245 nonstatic_byte_count ), heapOopSize );
3246 orig_nonstatic_field_size = nonstatic_field_size +
3247 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3248 }
3249 #endif
3250 bool compact_fields = CompactFields;
3251 int allocation_style = FieldsAllocationStyle;
3252 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3253 assert(false, "0 <= FieldsAllocationStyle <= 2");
3254 allocation_style = 1; // Optimistic
3255 }
3256
3257 // The next classes have predefined hard-coded fields offsets
3258 // (see in JavaClasses::compute_hard_coded_offsets()).
3259 // Use default fields allocation order for them.
3260 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3261 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3262 class_name == vmSymbols::java_lang_Class() ||
3263 class_name == vmSymbols::java_lang_ClassLoader() ||
3264 class_name == vmSymbols::java_lang_ref_Reference() ||
3265 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3266 class_name == vmSymbols::java_lang_StackTraceElement() ||
3267 class_name == vmSymbols::java_lang_String() ||
3268 class_name == vmSymbols::java_lang_Throwable() ||
3269 class_name == vmSymbols::java_lang_Boolean() ||
3270 class_name == vmSymbols::java_lang_Character() ||
3271 class_name == vmSymbols::java_lang_Float() ||
3272 class_name == vmSymbols::java_lang_Double() ||
3273 class_name == vmSymbols::java_lang_Byte() ||
3274 class_name == vmSymbols::java_lang_Short() ||
3275 class_name == vmSymbols::java_lang_Integer() ||
3276 class_name == vmSymbols::java_lang_Long())) {
3277 allocation_style = 0; // Allocate oops first
3278 compact_fields = false; // Don't compact fields
3279 }
3280
3281 if( allocation_style == 0 ) {
3282 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3283 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3284 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3285 (nonstatic_oop_count * heapOopSize);
3286 } else if( allocation_style == 1 ) {
3287 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3288 next_nonstatic_double_offset = next_nonstatic_field_offset;
3289 } else if( allocation_style == 2 ) {
3290 // Fields allocation: oops fields in super and sub classes are together.
3291 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3292 super_klass->nonstatic_oop_map_size() > 0 ) {
3293 int map_size = super_klass->nonstatic_oop_map_size();
3294 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3295 OopMapBlock* last_map = first_map + map_size - 1;
3296 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3297 if (next_offset == next_nonstatic_field_offset) {
3298 allocation_style = 0; // allocate oops first
3299 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3300 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3301 (nonstatic_oop_count * heapOopSize);
3302 }
3303 }
3304 if( allocation_style == 2 ) {
3305 allocation_style = 1; // allocate oops last
3306 next_nonstatic_double_offset = next_nonstatic_field_offset;
3307 }
3308 } else {
3309 ShouldNotReachHere();
3310 }
3311
3312 int nonstatic_oop_space_count = 0;
3313 int nonstatic_word_space_count = 0;
3314 int nonstatic_short_space_count = 0;
3315 int nonstatic_byte_space_count = 0;
3316 int nonstatic_oop_space_offset;
3317 int nonstatic_word_space_offset;
3318 int nonstatic_short_space_offset;
3319 int nonstatic_byte_space_offset;
3320
3321 if( nonstatic_double_count > 0 ) {
3322 int offset = next_nonstatic_double_offset;
3323 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3324 if( compact_fields && offset != next_nonstatic_double_offset ) {
3325 // Allocate available fields into the gap before double field.
3326 int length = next_nonstatic_double_offset - offset;
3327 assert(length == BytesPerInt, "");
3328 nonstatic_word_space_offset = offset;
3329 if( nonstatic_word_count > 0 ) {
3330 nonstatic_word_count -= 1;
3331 nonstatic_word_space_count = 1; // Only one will fit
3332 length -= BytesPerInt;
3333 offset += BytesPerInt;
3334 }
3335 nonstatic_short_space_offset = offset;
3336 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3337 nonstatic_short_count -= 1;
3338 nonstatic_short_space_count += 1;
3339 length -= BytesPerShort;
3340 offset += BytesPerShort;
3341 }
3342 nonstatic_byte_space_offset = offset;
3343 while( length > 0 && nonstatic_byte_count > 0 ) {
3344 nonstatic_byte_count -= 1;
3345 nonstatic_byte_space_count += 1;
3346 length -= 1;
3347 }
3348 // Allocate oop field in the gap if there are no other fields for that.
3349 nonstatic_oop_space_offset = offset;
3350 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3351 allocation_style != 0 ) { // when oop fields not first
3352 nonstatic_oop_count -= 1;
3353 nonstatic_oop_space_count = 1; // Only one will fit
3354 length -= heapOopSize;
3355 offset += heapOopSize;
3356 }
3357 }
3358 }
3359
3360 next_nonstatic_word_offset = next_nonstatic_double_offset +
3361 (nonstatic_double_count * BytesPerLong);
3362 next_nonstatic_short_offset = next_nonstatic_word_offset +
3363 (nonstatic_word_count * BytesPerInt);
3364 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3365 (nonstatic_short_count * BytesPerShort);
3366
3367 int notaligned_offset;
3368 if( allocation_style == 0 ) {
3369 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3370 } else { // allocation_style == 1
3371 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3372 if( nonstatic_oop_count > 0 ) {
3373 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3374 }
3375 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3376 }
3377 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3378 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3379 - first_nonstatic_field_offset)/heapOopSize);
3380
3381 // Iterate over fields again and compute correct offsets.
3382 // The field allocation type was temporarily stored in the offset slot.
3383 // oop fields are located before non-oop fields (static and non-static).
3384 int len = fields->length();
3385 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3386 int real_offset;
3387 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3388 switch (atype) {
3389 case STATIC_OOP:
3390 real_offset = next_static_oop_offset;
3391 next_static_oop_offset += heapOopSize;
3392 break;
3393 case STATIC_BYTE:
3394 real_offset = next_static_byte_offset;
3395 next_static_byte_offset += 1;
3396 break;
3397 case STATIC_SHORT:
3398 real_offset = next_static_short_offset;
3399 next_static_short_offset += BytesPerShort;
3400 break;
3401 case STATIC_WORD:
3402 real_offset = next_static_word_offset;
3403 next_static_word_offset += BytesPerInt;
3404 break;
3405 case STATIC_ALIGNED_DOUBLE:
3406 case STATIC_DOUBLE:
3407 real_offset = next_static_double_offset;
3408 next_static_double_offset += BytesPerLong;
3409 break;
3410 case NONSTATIC_OOP:
3411 if( nonstatic_oop_space_count > 0 ) {
3412 real_offset = nonstatic_oop_space_offset;
3413 nonstatic_oop_space_offset += heapOopSize;
3414 nonstatic_oop_space_count -= 1;
3415 } else {
3416 real_offset = next_nonstatic_oop_offset;
3417 next_nonstatic_oop_offset += heapOopSize;
3418 }
3419 // Update oop maps
3420 if( nonstatic_oop_map_count > 0 &&
3421 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3422 real_offset -
3423 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3424 heapOopSize ) {
3425 // Extend current oop map
3426 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3427 } else {
3428 // Create new oop map
3429 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3430 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3431 nonstatic_oop_map_count += 1;
3432 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3433 first_nonstatic_oop_offset = real_offset;
3434 }
3435 }
3436 break;
3437 case NONSTATIC_BYTE:
3438 if( nonstatic_byte_space_count > 0 ) {
3439 real_offset = nonstatic_byte_space_offset;
3440 nonstatic_byte_space_offset += 1;
3441 nonstatic_byte_space_count -= 1;
3442 } else {
3443 real_offset = next_nonstatic_byte_offset;
3444 next_nonstatic_byte_offset += 1;
3445 }
3446 break;
3447 case NONSTATIC_SHORT:
3448 if( nonstatic_short_space_count > 0 ) {
3449 real_offset = nonstatic_short_space_offset;
3450 nonstatic_short_space_offset += BytesPerShort;
3451 nonstatic_short_space_count -= 1;
3452 } else {
3453 real_offset = next_nonstatic_short_offset;
3454 next_nonstatic_short_offset += BytesPerShort;
3455 }
3456 break;
3457 case NONSTATIC_WORD:
3458 if( nonstatic_word_space_count > 0 ) {
3459 real_offset = nonstatic_word_space_offset;
3460 nonstatic_word_space_offset += BytesPerInt;
3461 nonstatic_word_space_count -= 1;
3462 } else {
3463 real_offset = next_nonstatic_word_offset;
3464 next_nonstatic_word_offset += BytesPerInt;
3465 }
3466 break;
3467 case NONSTATIC_ALIGNED_DOUBLE:
3468 case NONSTATIC_DOUBLE:
3469 real_offset = next_nonstatic_double_offset;
3470 next_nonstatic_double_offset += BytesPerLong;
3471 break;
3472 default:
3473 ShouldNotReachHere();
3474 }
3475 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3476 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3477 }
3478
3479 // Size of instances
3480 int instance_size;
3481
3482 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3483 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3484
3485 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3486
3487 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3488 // record location of extra ints
3489 java_lang_Class::oop_size_offset = next_nonstatic_word_offset;
3490 next_nonstatic_word_offset += BytesPerInt;
3491 java_lang_Class::static_oop_field_size_offset = next_nonstatic_word_offset;
3492 next_nonstatic_word_offset += BytesPerInt;
3493 }
3494
3495 // Number of non-static oop map blocks allocated at end of klass.
3496 const unsigned int total_oop_map_count =
3497 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3498 first_nonstatic_oop_offset);
3499
3500 // Compute reference type
3501 ReferenceType rt;
3502 if (super_klass() == NULL) {
3503 rt = REF_NONE;
3504 } else if (class_name == vmSymbols::java_lang_Class()) {
3505 rt = REF_MIRROR;
3506 } else {
3507 rt = super_klass->reference_type();
3508 }
3509
3510 // We can now create the basic klassOop for this klass
3511 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3512 static_field_size,
3513 total_oop_map_count,
3514 rt, CHECK_(nullHandle));
3515 instanceKlassHandle this_klass (THREAD, ik);
3516
3517 assert(this_klass->static_field_size() == static_field_size, "sanity");
3518 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3519 "sanity");
3520
3521 // Fill in information already parsed
3522 this_klass->set_access_flags(access_flags);
3523 this_klass->set_should_verify_class(verify);
3524 jint lh = Klass::instance_layout_helper(instance_size, false);
3525 this_klass->set_layout_helper(lh);
3526 assert(this_klass->oop_is_instance(), "layout is correct");
3527 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3528 // Not yet: supers are done below to support the new subtype-checking fields
3529 //this_klass->set_super(super_klass());
3530 this_klass->set_class_loader(class_loader());
3531 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3532 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3533 this_klass->set_static_oop_field_size(fac.static_oop_count);
3534 cp->set_pool_holder(this_klass());
3535 error_handler.set_in_error(false); // turn off error handler for cp
3536 this_klass->set_constants(cp());
3537 this_klass->set_local_interfaces(local_interfaces());
3538 this_klass->set_fields(fields());
3539 this_klass->set_methods(methods());
3540 if (has_final_method) {
3541 this_klass->set_has_final_method();
3542 }
3543 this_klass->set_method_ordering(method_ordering());
3544 // The instanceKlass::_methods_jmethod_ids cache and the
3545 // instanceKlass::_methods_cached_itable_indices cache are
3546 // both managed on the assumption that the initial cache
3547 // size is equal to the number of methods in the class. If
3548 // that changes, then instanceKlass::idnum_can_increment()
3549 // has to be changed accordingly.
3550 this_klass->set_initial_method_idnum(methods->length());
3551 this_klass->set_name(cp->klass_name_at(this_class_index));
3552 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3553 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3554 this_klass->set_protection_domain(protection_domain());
3555 this_klass->set_fields_annotations(fields_annotations());
3556 this_klass->set_methods_annotations(methods_annotations());
3557 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3558 this_klass->set_methods_default_annotations(methods_default_annotations());
3559
3560 this_klass->set_minor_version(minor_version);
3561 this_klass->set_major_version(major_version);
3562
3563 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3564 // (We used to do this lazily, but now we query it in Rewriter,
3565 // which is eagerly done for every method, so we might as well do it now,
3566 // when everything is fresh in memory.)
3567 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3568 for (int j = 0; j < methods->length(); j++) {
3569 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3570 }
3571 }
3572
3573 if (cached_class_file_bytes != NULL) {
3574 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3575 this_klass->set_cached_class_file(cached_class_file_bytes,
3576 cached_class_file_length);
3577 }
3578
3579 // Miranda methods
3580 if ((num_miranda_methods > 0) ||
3581 // if this class introduced new miranda methods or
3582 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3583 // super class exists and this class inherited miranda methods
3584 ) {
3585 this_klass->set_has_miranda_methods(); // then set a flag
3586 }
3587
3588 // Additional attributes
3589 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3590
3591 // Make sure this is the end of class file stream
3592 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3593
3594 // VerifyOops believes that once this has been set, the object is completely loaded.
3595 // Compute transitive closure of interfaces this class implements
3596 this_klass->set_transitive_interfaces(transitive_interfaces());
3597
3598 // Fill in information needed to compute superclasses.
3599 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3600
3601 // Initialize itable offset tables
3602 klassItable::setup_itable_offset_table(this_klass);
3603
3604 // Do final class setup
3605 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3606
3607 set_precomputed_flags(this_klass);
3608
3609 // reinitialize modifiers, using the InnerClasses attribute
3610 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3611 this_klass->set_modifier_flags(computed_modifiers);
3612
3613 // check if this class can access its super class
3614 check_super_class_access(this_klass, CHECK_(nullHandle));
3615
3616 // check if this class can access its superinterfaces
3617 check_super_interface_access(this_klass, CHECK_(nullHandle));
3618
3619 // check if this class overrides any final method
3620 check_final_method_override(this_klass, CHECK_(nullHandle));
3621
3622 // check that if this class is an interface then it doesn't have static methods
3623 if (this_klass->is_interface()) {
3624 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3625 }
3626
3627 // Allocate mirror and initialize static fields
3628 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3629
3630 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3631 false /* not shared class */);
3632
3633 if (TraceClassLoading) {
3634 // print in a single call to reduce interleaving of output
3635 if (cfs->source() != NULL) {
3636 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3637 cfs->source());
3638 } else if (class_loader.is_null()) {
3639 if (THREAD->is_Java_thread()) {
3640 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3641 tty->print("[Loaded %s by instance of %s]\n",
3642 this_klass->external_name(),
3643 instanceKlass::cast(caller)->external_name());
3644 } else {
3645 tty->print("[Loaded %s]\n", this_klass->external_name());
3646 }
3647 } else {
3648 ResourceMark rm;
3649 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3650 instanceKlass::cast(class_loader->klass())->external_name());
3651 }
3652 }
3653
3654 if (TraceClassResolution) {
3655 // print out the superclass.
3656 const char * from = Klass::cast(this_klass())->external_name();
3657 if (this_klass->java_super() != NULL) {
3658 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3659 }
3660 // print out each of the interface classes referred to by this class.
3661 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3662 if (!local_interfaces.is_null()) {
3663 int length = local_interfaces->length();
3664 for (int i = 0; i < length; i++) {
3665 klassOop k = klassOop(local_interfaces->obj_at(i));
3666 instanceKlass* to_class = instanceKlass::cast(k);
3667 const char * to = to_class->external_name();
3668 tty->print("RESOLVE %s %s (interface)\n", from, to);
3669 }
3670 }
3671 }
3672
3673 #ifndef PRODUCT
3674 if( PrintCompactFieldsSavings ) {
3675 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3676 tty->print("[Saved %d of %d bytes in %s]\n",
3677 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3678 orig_nonstatic_field_size*heapOopSize,
3679 this_klass->external_name());
3680 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3681 tty->print("[Wasted %d over %d bytes in %s]\n",
3682 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3683 orig_nonstatic_field_size*heapOopSize,
3684 this_klass->external_name());
3685 }
3686 }
3687 #endif
3688
3689 // preserve result across HandleMark
3690 preserve_this_klass = this_klass();
3691 }
3692
3693 // Create new handle outside HandleMark
3694 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3695 debug_only(this_klass->as_klassOop()->verify();)
3696
3697 return this_klass;
3698 }
3699
3700
3701 unsigned int
3702 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3703 unsigned int nonstatic_oop_map_count,
3704 int first_nonstatic_oop_offset) {
3705 unsigned int map_count =
3706 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3707 if (nonstatic_oop_map_count > 0) {
3708 // We have oops to add to map
3709 if (map_count == 0) {
3710 map_count = nonstatic_oop_map_count;
3711 } else {
3712 // Check whether we should add a new map block or whether the last one can
3713 // be extended
3714 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3715 OopMapBlock* const last_map = first_map + map_count - 1;
3716
3717 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3718 if (next_offset == first_nonstatic_oop_offset) {
3719 // There is no gap bettwen superklass's last oop field and first
3720 // local oop field, merge maps.
3721 nonstatic_oop_map_count -= 1;
3722 } else {
3723 // Superklass didn't end with a oop field, add extra maps
3724 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3725 }
3726 map_count += nonstatic_oop_map_count;
3727 }
3728 }
3729 return map_count;
3730 }
3731
3732
3733 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3734 unsigned int nonstatic_oop_map_count,
3735 int* nonstatic_oop_offsets,
3736 unsigned int* nonstatic_oop_counts) {
3737 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3738 const instanceKlass* const super = k->superklass();
3739 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3740 if (super_count > 0) {
3741 // Copy maps from superklass
3742 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3743 for (unsigned int i = 0; i < super_count; ++i) {
3744 *this_oop_map++ = *super_oop_map++;
3745 }
3746 }
3747
3748 if (nonstatic_oop_map_count > 0) {
3749 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3750 // The counts differ because there is no gap between superklass's last oop
3751 // field and the first local oop field. Extend the last oop map copied
3752 // from the superklass instead of creating new one.
3753 nonstatic_oop_map_count--;
3754 nonstatic_oop_offsets++;
3755 this_oop_map--;
3756 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3757 this_oop_map++;
3758 }
3759
3760 // Add new map blocks, fill them
3761 while (nonstatic_oop_map_count-- > 0) {
3762 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3763 this_oop_map->set_count(*nonstatic_oop_counts++);
3764 this_oop_map++;
3765 }
3766 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3767 this_oop_map, "sanity");
3768 }
3769 }
3770
3771
3772 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3773 klassOop super = k->super();
3774
3775 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3776 // in which case we don't have to register objects as finalizable
3777 if (!_has_empty_finalizer) {
3778 if (_has_finalizer ||
3779 (super != NULL && super->klass_part()->has_finalizer())) {
3780 k->set_has_finalizer();
3781 }
3782 }
3783
3784 #ifdef ASSERT
3785 bool f = false;
3786 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3787 vmSymbols::void_method_signature());
3788 if (m != NULL && !m->is_empty_method()) {
3789 f = true;
3790 }
3791 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3792 #endif
3793
3794 // Check if this klass supports the java.lang.Cloneable interface
3795 if (SystemDictionary::Cloneable_klass_loaded()) {
3796 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3797 k->set_is_cloneable();
3798 }
3799 }
3800
3801 // Check if this klass has a vanilla default constructor
3802 if (super == NULL) {
3803 // java.lang.Object has empty default constructor
3804 k->set_has_vanilla_constructor();
3805 } else {
3806 if (Klass::cast(super)->has_vanilla_constructor() &&
3807 _has_vanilla_constructor) {
3808 k->set_has_vanilla_constructor();
3809 }
3810 #ifdef ASSERT
3811 bool v = false;
3812 if (Klass::cast(super)->has_vanilla_constructor()) {
3813 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3814 ), vmSymbols::void_method_signature());
3815 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3816 v = true;
3817 }
3818 }
3819 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3820 #endif
3821 }
3822
3823 // If it cannot be fast-path allocated, set a bit in the layout helper.
3824 // See documentation of instanceKlass::can_be_fastpath_allocated().
3825 assert(k->size_helper() > 0, "layout_helper is initialized");
3826 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3827 || k->is_abstract() || k->is_interface()
3828 || (k->name() == vmSymbols::java_lang_Class()
3829 && k->class_loader() == NULL)
3830 || k->size_helper() >= FastAllocateSizeLimit) {
3831 // Forbid fast-path allocation.
3832 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3833 k->set_layout_helper(lh);
3834 }
3835 }
3836
3837
3838 // utility method for appending and array with check for duplicates
3839
3840 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3841 // iterate over new interfaces
3842 for (int i = 0; i < ifs->length(); i++) {
3843 oop e = ifs->obj_at(i);
3844 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3845 // check for duplicates
3846 bool duplicate = false;
3847 for (int j = 0; j < index; j++) {
3848 if (result->obj_at(j) == e) {
3849 duplicate = true;
3850 break;
3851 }
3852 }
3853 // add new interface
3854 if (!duplicate) {
3855 result->obj_at_put(index++, e);
3856 }
3857 }
3858 }
3859
3860 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3861 // Compute maximum size for transitive interfaces
3862 int max_transitive_size = 0;
3863 int super_size = 0;
3864 // Add superclass transitive interfaces size
3865 if (super.not_null()) {
3866 super_size = super->transitive_interfaces()->length();
3867 max_transitive_size += super_size;
3868 }
3869 // Add local interfaces' super interfaces
3870 int local_size = local_ifs->length();
3871 for (int i = 0; i < local_size; i++) {
3872 klassOop l = klassOop(local_ifs->obj_at(i));
3873 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3874 }
3875 // Finally add local interfaces
3876 max_transitive_size += local_size;
3877 // Construct array
3878 objArrayHandle result;
3879 if (max_transitive_size == 0) {
3880 // no interfaces, use canonicalized array
3881 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3882 } else if (max_transitive_size == super_size) {
3883 // no new local interfaces added, share superklass' transitive interface array
3884 result = objArrayHandle(THREAD, super->transitive_interfaces());
3885 } else if (max_transitive_size == local_size) {
3886 // only local interfaces added, share local interface array
3887 result = local_ifs;
3888 } else {
3889 objArrayHandle nullHandle;
3890 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3891 result = objArrayHandle(THREAD, new_objarray);
3892 int index = 0;
3893 // Copy down from superclass
3894 if (super.not_null()) {
3895 append_interfaces(result, index, super->transitive_interfaces());
3896 }
3897 // Copy down from local interfaces' superinterfaces
3898 for (int i = 0; i < local_ifs->length(); i++) {
3899 klassOop l = klassOop(local_ifs->obj_at(i));
3900 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3901 }
3902 // Finally add local interfaces
3903 append_interfaces(result, index, local_ifs());
3904
3905 // Check if duplicates were removed
3906 if (index != max_transitive_size) {
3907 assert(index < max_transitive_size, "just checking");
3908 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3909 for (int i = 0; i < index; i++) {
3910 oop e = result->obj_at(i);
3911 assert(e != NULL, "just checking");
3912 new_result->obj_at_put(i, e);
3913 }
3914 result = objArrayHandle(THREAD, new_result);
3915 }
3916 }
3917 return result;
3918 }
3919
3920
3921 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3922 klassOop super = this_klass->super();
3923 if ((super != NULL) &&
3924 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3925 ResourceMark rm(THREAD);
3926 Exceptions::fthrow(
3927 THREAD_AND_LOCATION,
3928 vmSymbols::java_lang_IllegalAccessError(),
3929 "class %s cannot access its superclass %s",
3930 this_klass->external_name(),
3931 instanceKlass::cast(super)->external_name()
3932 );
3933 return;
3934 }
3935 }
3936
3937
3938 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3939 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3940 int lng = local_interfaces->length();
3941 for (int i = lng - 1; i >= 0; i--) {
3942 klassOop k = klassOop(local_interfaces->obj_at(i));
3943 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3944 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3945 ResourceMark rm(THREAD);
3946 Exceptions::fthrow(
3947 THREAD_AND_LOCATION,
3948 vmSymbols::java_lang_IllegalAccessError(),
3949 "class %s cannot access its superinterface %s",
3950 this_klass->external_name(),
3951 instanceKlass::cast(k)->external_name()
3952 );
3953 return;
3954 }
3955 }
3956 }
3957
3958
3959 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3960 objArrayHandle methods (THREAD, this_klass->methods());
3961 int num_methods = methods->length();
3962
3963 // go thru each method and check if it overrides a final method
3964 for (int index = 0; index < num_methods; index++) {
3965 methodOop m = (methodOop)methods->obj_at(index);
3966
3967 // skip private, static and <init> methods
3968 if ((!m->is_private()) &&
3969 (!m->is_static()) &&
3970 (m->name() != vmSymbols::object_initializer_name())) {
3971
3972 Symbol* name = m->name();
3973 Symbol* signature = m->signature();
3974 klassOop k = this_klass->super();
3975 methodOop super_m = NULL;
3976 while (k != NULL) {
3977 // skip supers that don't have final methods.
3978 if (k->klass_part()->has_final_method()) {
3979 // lookup a matching method in the super class hierarchy
3980 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3981 if (super_m == NULL) {
3982 break; // didn't find any match; get out
3983 }
3984
3985 if (super_m->is_final() &&
3986 // matching method in super is final
3987 (Reflection::verify_field_access(this_klass->as_klassOop(),
3988 super_m->method_holder(),
3989 super_m->method_holder(),
3990 super_m->access_flags(), false))
3991 // this class can access super final method and therefore override
3992 ) {
3993 ResourceMark rm(THREAD);
3994 Exceptions::fthrow(
3995 THREAD_AND_LOCATION,
3996 vmSymbols::java_lang_VerifyError(),
3997 "class %s overrides final method %s.%s",
3998 this_klass->external_name(),
3999 name->as_C_string(),
4000 signature->as_C_string()
4001 );
4002 return;
4003 }
4004
4005 // continue to look from super_m's holder's super.
4006 k = instanceKlass::cast(super_m->method_holder())->super();
4007 continue;
4008 }
4009
4010 k = k->klass_part()->super();
4011 }
4012 }
4013 }
4014 }
4015
4016
4017 // assumes that this_klass is an interface
4018 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4019 assert(this_klass->is_interface(), "not an interface");
4020 objArrayHandle methods (THREAD, this_klass->methods());
4021 int num_methods = methods->length();
4022
4023 for (int index = 0; index < num_methods; index++) {
4024 methodOop m = (methodOop)methods->obj_at(index);
4025 // if m is static and not the init method, throw a verify error
4026 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4027 ResourceMark rm(THREAD);
4028 Exceptions::fthrow(
4029 THREAD_AND_LOCATION,
4030 vmSymbols::java_lang_VerifyError(),
4031 "Illegal static method %s in interface %s",
4032 m->name()->as_C_string(),
4033 this_klass->external_name()
4034 );
4035 return;
4036 }
4037 }
4038 }
4039
4040 // utility methods for format checking
4041
4042 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4043 if (!_need_verify) { return; }
4044
4045 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4046 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4047 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4048 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4049 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4050 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4051 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4052
4053 if ((is_abstract && is_final) ||
4054 (is_interface && !is_abstract) ||
4055 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4056 (!is_interface && major_gte_15 && is_annotation)) {
4057 ResourceMark rm(THREAD);
4058 Exceptions::fthrow(
4059 THREAD_AND_LOCATION,
4060 vmSymbols::java_lang_ClassFormatError(),
4061 "Illegal class modifiers in class %s: 0x%X",
4062 _class_name->as_C_string(), flags
4063 );
4064 return;
4065 }
4066 }
4067
4068 bool ClassFileParser::has_illegal_visibility(jint flags) {
4069 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4070 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4071 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4072
4073 return ((is_public && is_protected) ||
4074 (is_public && is_private) ||
4075 (is_protected && is_private));
4076 }
4077
4078 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4079 u2 max_version =
4080 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4081 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4082 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4083 (major <= max_version) &&
4084 ((major != max_version) ||
4085 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4086 }
4087
4088 void ClassFileParser::verify_legal_field_modifiers(
4089 jint flags, bool is_interface, TRAPS) {
4090 if (!_need_verify) { return; }
4091
4092 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4093 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4094 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4095 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4096 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4097 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4098 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4099 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4100 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4101
4102 bool is_illegal = false;
4103
4104 if (is_interface) {
4105 if (!is_public || !is_static || !is_final || is_private ||
4106 is_protected || is_volatile || is_transient ||
4107 (major_gte_15 && is_enum)) {
4108 is_illegal = true;
4109 }
4110 } else { // not interface
4111 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4112 is_illegal = true;
4113 }
4114 }
4115
4116 if (is_illegal) {
4117 ResourceMark rm(THREAD);
4118 Exceptions::fthrow(
4119 THREAD_AND_LOCATION,
4120 vmSymbols::java_lang_ClassFormatError(),
4121 "Illegal field modifiers in class %s: 0x%X",
4122 _class_name->as_C_string(), flags);
4123 return;
4124 }
4125 }
4126
4127 void ClassFileParser::verify_legal_method_modifiers(
4128 jint flags, bool is_interface, Symbol* name, TRAPS) {
4129 if (!_need_verify) { return; }
4130
4131 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4132 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4133 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4134 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4135 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4136 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4137 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4138 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4139 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4140 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4141 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4142
4143 bool is_illegal = false;
4144
4145 if (is_interface) {
4146 if (!is_abstract || !is_public || is_static || is_final ||
4147 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4148 is_illegal = true;
4149 }
4150 } else { // not interface
4151 if (is_initializer) {
4152 if (is_static || is_final || is_synchronized || is_native ||
4153 is_abstract || (major_gte_15 && is_bridge)) {
4154 is_illegal = true;
4155 }
4156 } else { // not initializer
4157 if (is_abstract) {
4158 if ((is_final || is_native || is_private || is_static ||
4159 (major_gte_15 && (is_synchronized || is_strict)))) {
4160 is_illegal = true;
4161 }
4162 }
4163 if (has_illegal_visibility(flags)) {
4164 is_illegal = true;
4165 }
4166 }
4167 }
4168
4169 if (is_illegal) {
4170 ResourceMark rm(THREAD);
4171 Exceptions::fthrow(
4172 THREAD_AND_LOCATION,
4173 vmSymbols::java_lang_ClassFormatError(),
4174 "Method %s in class %s has illegal modifiers: 0x%X",
4175 name->as_C_string(), _class_name->as_C_string(), flags);
4176 return;
4177 }
4178 }
4179
4180 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4181 assert(_need_verify, "only called when _need_verify is true");
4182 int i = 0;
4183 int count = length >> 2;
4184 for (int k=0; k<count; k++) {
4185 unsigned char b0 = buffer[i];
4186 unsigned char b1 = buffer[i+1];
4187 unsigned char b2 = buffer[i+2];
4188 unsigned char b3 = buffer[i+3];
4189 // For an unsigned char v,
4190 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4191 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4192 unsigned char res = b0 | b0 - 1 |
4193 b1 | b1 - 1 |
4194 b2 | b2 - 1 |
4195 b3 | b3 - 1;
4196 if (res >= 128) break;
4197 i += 4;
4198 }
4199 for(; i < length; i++) {
4200 unsigned short c;
4201 // no embedded zeros
4202 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4203 if(buffer[i] < 128) {
4204 continue;
4205 }
4206 if ((i + 5) < length) { // see if it's legal supplementary character
4207 if (UTF8::is_supplementary_character(&buffer[i])) {
4208 c = UTF8::get_supplementary_character(&buffer[i]);
4209 i += 5;
4210 continue;
4211 }
4212 }
4213 switch (buffer[i] >> 4) {
4214 default: break;
4215 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4216 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4217 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4218 c = (buffer[i] & 0x1F) << 6;
4219 i++;
4220 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4221 c += buffer[i] & 0x3F;
4222 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4223 // for classes with major > 47, c must a null or a character in its shortest form
4224 break;
4225 }
4226 }
4227 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4228 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4229 c = (buffer[i] & 0xF) << 12;
4230 i += 2;
4231 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4232 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4233 if (_major_version <= 47 || c >= 0x800) {
4234 // for classes with major > 47, c must be in its shortest form
4235 break;
4236 }
4237 }
4238 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4239 } // end of switch
4240 } // end of for
4241 }
4242
4243 // Checks if name is a legal class name.
4244 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4245 if (!_need_verify || _relax_verify) { return; }
4246
4247 char buf[fixed_buffer_size];
4248 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4249 unsigned int length = name->utf8_length();
4250 bool legal = false;
4251
4252 if (length > 0) {
4253 char* p;
4254 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4255 p = skip_over_field_signature(bytes, false, length, CHECK);
4256 legal = (p != NULL) && ((p - bytes) == (int)length);
4257 } else if (_major_version < JAVA_1_5_VERSION) {
4258 if (bytes[0] != '<') {
4259 p = skip_over_field_name(bytes, true, length);
4260 legal = (p != NULL) && ((p - bytes) == (int)length);
4261 }
4262 } else {
4263 // 4900761: relax the constraints based on JSR202 spec
4264 // Class names may be drawn from the entire Unicode character set.
4265 // Identifiers between '/' must be unqualified names.
4266 // The utf8 string has been verified when parsing cpool entries.
4267 legal = verify_unqualified_name(bytes, length, LegalClass);
4268 }
4269 }
4270 if (!legal) {
4271 ResourceMark rm(THREAD);
4272 Exceptions::fthrow(
4273 THREAD_AND_LOCATION,
4274 vmSymbols::java_lang_ClassFormatError(),
4275 "Illegal class name \"%s\" in class file %s", bytes,
4276 _class_name->as_C_string()
4277 );
4278 return;
4279 }
4280 }
4281
4282 // Checks if name is a legal field name.
4283 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4284 if (!_need_verify || _relax_verify) { return; }
4285
4286 char buf[fixed_buffer_size];
4287 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4288 unsigned int length = name->utf8_length();
4289 bool legal = false;
4290
4291 if (length > 0) {
4292 if (_major_version < JAVA_1_5_VERSION) {
4293 if (bytes[0] != '<') {
4294 char* p = skip_over_field_name(bytes, false, length);
4295 legal = (p != NULL) && ((p - bytes) == (int)length);
4296 }
4297 } else {
4298 // 4881221: relax the constraints based on JSR202 spec
4299 legal = verify_unqualified_name(bytes, length, LegalField);
4300 }
4301 }
4302
4303 if (!legal) {
4304 ResourceMark rm(THREAD);
4305 Exceptions::fthrow(
4306 THREAD_AND_LOCATION,
4307 vmSymbols::java_lang_ClassFormatError(),
4308 "Illegal field name \"%s\" in class %s", bytes,
4309 _class_name->as_C_string()
4310 );
4311 return;
4312 }
4313 }
4314
4315 // Checks if name is a legal method name.
4316 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4317 if (!_need_verify || _relax_verify) { return; }
4318
4319 assert(name != NULL, "method name is null");
4320 char buf[fixed_buffer_size];
4321 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4322 unsigned int length = name->utf8_length();
4323 bool legal = false;
4324
4325 if (length > 0) {
4326 if (bytes[0] == '<') {
4327 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4328 legal = true;
4329 }
4330 } else if (_major_version < JAVA_1_5_VERSION) {
4331 char* p;
4332 p = skip_over_field_name(bytes, false, length);
4333 legal = (p != NULL) && ((p - bytes) == (int)length);
4334 } else {
4335 // 4881221: relax the constraints based on JSR202 spec
4336 legal = verify_unqualified_name(bytes, length, LegalMethod);
4337 }
4338 }
4339
4340 if (!legal) {
4341 ResourceMark rm(THREAD);
4342 Exceptions::fthrow(
4343 THREAD_AND_LOCATION,
4344 vmSymbols::java_lang_ClassFormatError(),
4345 "Illegal method name \"%s\" in class %s", bytes,
4346 _class_name->as_C_string()
4347 );
4348 return;
4349 }
4350 }
4351
4352
4353 // Checks if signature is a legal field signature.
4354 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4355 if (!_need_verify) { return; }
4356
4357 char buf[fixed_buffer_size];
4358 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4359 unsigned int length = signature->utf8_length();
4360 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4361
4362 if (p == NULL || (p - bytes) != (int)length) {
4363 throwIllegalSignature("Field", name, signature, CHECK);
4364 }
4365 }
4366
4367 // Checks if signature is a legal method signature.
4368 // Returns number of parameters
4369 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4370 if (!_need_verify) {
4371 // make sure caller's args_size will be less than 0 even for non-static
4372 // method so it will be recomputed in compute_size_of_parameters().
4373 return -2;
4374 }
4375
4376 unsigned int args_size = 0;
4377 char buf[fixed_buffer_size];
4378 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4379 unsigned int length = signature->utf8_length();
4380 char* nextp;
4381
4382 // The first character must be a '('
4383 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4384 length--;
4385 // Skip over legal field signatures
4386 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4387 while ((length > 0) && (nextp != NULL)) {
4388 args_size++;
4389 if (p[0] == 'J' || p[0] == 'D') {
4390 args_size++;
4391 }
4392 length -= nextp - p;
4393 p = nextp;
4394 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4395 }
4396 // The first non-signature thing better be a ')'
4397 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4398 length--;
4399 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4400 // All internal methods must return void
4401 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4402 return args_size;
4403 }
4404 } else {
4405 // Now we better just have a return value
4406 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4407 if (nextp && ((int)length == (nextp - p))) {
4408 return args_size;
4409 }
4410 }
4411 }
4412 }
4413 // Report error
4414 throwIllegalSignature("Method", name, signature, CHECK_0);
4415 return 0;
4416 }
4417
4418
4419 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4420 // Method names also may not contain the characters '<' or '>', unless <init>
4421 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4422 // method. Because these names have been checked as special cases before
4423 // calling this method in verify_legal_method_name.
4424 bool ClassFileParser::verify_unqualified_name(
4425 char* name, unsigned int length, int type) {
4426 jchar ch;
4427
4428 for (char* p = name; p != name + length; ) {
4429 ch = *p;
4430 if (ch < 128) {
4431 p++;
4432 if (ch == '.' || ch == ';' || ch == '[' ) {
4433 return false; // do not permit '.', ';', or '['
4434 }
4435 if (type != LegalClass && ch == '/') {
4436 return false; // do not permit '/' unless it's class name
4437 }
4438 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4439 return false; // do not permit '<' or '>' in method names
4440 }
4441 } else {
4442 char* tmp_p = UTF8::next(p, &ch);
4443 p = tmp_p;
4444 }
4445 }
4446 return true;
4447 }
4448
4449
4450 // Take pointer to a string. Skip over the longest part of the string that could
4451 // be taken as a fieldname. Allow '/' if slash_ok is true.
4452 // Return a pointer to just past the fieldname.
4453 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4454 // being true, we saw consecutive slashes (meaning we were looking for a
4455 // qualified path but found something that was badly-formed).
4456 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4457 char* p;
4458 jchar ch;
4459 jboolean last_is_slash = false;
4460 jboolean not_first_ch = false;
4461
4462 for (p = name; p != name + length; not_first_ch = true) {
4463 char* old_p = p;
4464 ch = *p;
4465 if (ch < 128) {
4466 p++;
4467 // quick check for ascii
4468 if ((ch >= 'a' && ch <= 'z') ||
4469 (ch >= 'A' && ch <= 'Z') ||
4470 (ch == '_' || ch == '$') ||
4471 (not_first_ch && ch >= '0' && ch <= '9')) {
4472 last_is_slash = false;
4473 continue;
4474 }
4475 if (slash_ok && ch == '/') {
4476 if (last_is_slash) {
4477 return NULL; // Don't permit consecutive slashes
4478 }
4479 last_is_slash = true;
4480 continue;
4481 }
4482 } else {
4483 jint unicode_ch;
4484 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4485 p = tmp_p;
4486 last_is_slash = false;
4487 // Check if ch is Java identifier start or is Java identifier part
4488 // 4672820: call java.lang.Character methods directly without generating separate tables.
4489 EXCEPTION_MARK;
4490 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4491
4492 // return value
4493 JavaValue result(T_BOOLEAN);
4494 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4495 JavaCallArguments args;
4496 args.push_int(unicode_ch);
4497
4498 // public static boolean isJavaIdentifierStart(char ch);
4499 JavaCalls::call_static(&result,
4500 klass,
4501 vmSymbols::isJavaIdentifierStart_name(),
4502 vmSymbols::int_bool_signature(),
4503 &args,
4504 THREAD);
4505
4506 if (HAS_PENDING_EXCEPTION) {
4507 CLEAR_PENDING_EXCEPTION;
4508 return 0;
4509 }
4510 if (result.get_jboolean()) {
4511 continue;
4512 }
4513
4514 if (not_first_ch) {
4515 // public static boolean isJavaIdentifierPart(char ch);
4516 JavaCalls::call_static(&result,
4517 klass,
4518 vmSymbols::isJavaIdentifierPart_name(),
4519 vmSymbols::int_bool_signature(),
4520 &args,
4521 THREAD);
4522
4523 if (HAS_PENDING_EXCEPTION) {
4524 CLEAR_PENDING_EXCEPTION;
4525 return 0;
4526 }
4527
4528 if (result.get_jboolean()) {
4529 continue;
4530 }
4531 }
4532 }
4533 return (not_first_ch) ? old_p : NULL;
4534 }
4535 return (not_first_ch) ? p : NULL;
4536 }
4537
4538
4539 // Take pointer to a string. Skip over the longest part of the string that could
4540 // be taken as a field signature. Allow "void" if void_ok.
4541 // Return a pointer to just past the signature.
4542 // Return NULL if no legal signature is found.
4543 char* ClassFileParser::skip_over_field_signature(char* signature,
4544 bool void_ok,
4545 unsigned int length,
4546 TRAPS) {
4547 unsigned int array_dim = 0;
4548 while (length > 0) {
4549 switch (signature[0]) {
4550 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4551 case JVM_SIGNATURE_BOOLEAN:
4552 case JVM_SIGNATURE_BYTE:
4553 case JVM_SIGNATURE_CHAR:
4554 case JVM_SIGNATURE_SHORT:
4555 case JVM_SIGNATURE_INT:
4556 case JVM_SIGNATURE_FLOAT:
4557 case JVM_SIGNATURE_LONG:
4558 case JVM_SIGNATURE_DOUBLE:
4559 return signature + 1;
4560 case JVM_SIGNATURE_CLASS: {
4561 if (_major_version < JAVA_1_5_VERSION) {
4562 // Skip over the class name if one is there
4563 char* p = skip_over_field_name(signature + 1, true, --length);
4564
4565 // The next character better be a semicolon
4566 if (p && (p - signature) > 1 && p[0] == ';') {
4567 return p + 1;
4568 }
4569 } else {
4570 // 4900761: For class version > 48, any unicode is allowed in class name.
4571 length--;
4572 signature++;
4573 while (length > 0 && signature[0] != ';') {
4574 if (signature[0] == '.') {
4575 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4576 }
4577 length--;
4578 signature++;
4579 }
4580 if (signature[0] == ';') { return signature + 1; }
4581 }
4582
4583 return NULL;
4584 }
4585 case JVM_SIGNATURE_ARRAY:
4586 array_dim++;
4587 if (array_dim > 255) {
4588 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4589 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4590 }
4591 // The rest of what's there better be a legal signature
4592 signature++;
4593 length--;
4594 void_ok = false;
4595 break;
4596
4597 default:
4598 return NULL;
4599 }
4600 }
4601 return NULL;
4602 }