1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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 (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
151 classfile_parse_error(
152 "Class file version does not support constant tag %u in class file %s",
153 tag, CHECK);
154 }
155 if (!EnableInvokeDynamic) {
156 classfile_parse_error(
157 "This JVM does not support constant tag %u in class file %s",
158 tag, CHECK);
159 }
160 if (tag == JVM_CONSTANT_MethodHandle) {
161 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
162 u1 ref_kind = cfs->get_u1_fast();
163 u2 method_index = cfs->get_u2_fast();
164 cp->method_handle_index_at_put(index, ref_kind, method_index);
165 } else if (tag == JVM_CONSTANT_MethodType) {
166 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
167 u2 signature_index = cfs->get_u2_fast();
168 cp->method_type_index_at_put(index, signature_index);
169 } else {
170 ShouldNotReachHere();
171 }
172 break;
173 case JVM_CONSTANT_InvokeDynamicTrans : // this tag appears only in old classfiles
174 case JVM_CONSTANT_InvokeDynamic :
175 {
176 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
177 classfile_parse_error(
178 "Class file version does not support constant tag %u in class file %s",
179 tag, CHECK);
180 }
181 if (!EnableInvokeDynamic) {
182 classfile_parse_error(
183 "This JVM does not support constant tag %u in class file %s",
184 tag, CHECK);
185 }
186 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
187 u2 bootstrap_specifier_index = cfs->get_u2_fast();
188 u2 name_and_type_index = cfs->get_u2_fast();
189 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
190 if (!AllowTransitionalJSR292)
191 classfile_parse_error(
192 "This JVM does not support transitional InvokeDynamic tag %u in class file %s",
193 tag, CHECK);
194 cp->invoke_dynamic_trans_at_put(index, bootstrap_specifier_index, name_and_type_index);
195 break;
196 }
197 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
198 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
199 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
200 }
201 break;
202 case JVM_CONSTANT_Integer :
203 {
204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
205 u4 bytes = cfs->get_u4_fast();
206 cp->int_at_put(index, (jint) bytes);
207 }
208 break;
209 case JVM_CONSTANT_Float :
210 {
211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
212 u4 bytes = cfs->get_u4_fast();
213 cp->float_at_put(index, *(jfloat*)&bytes);
214 }
215 break;
216 case JVM_CONSTANT_Long :
217 // A mangled type might cause you to overrun allocated memory
218 guarantee_property(index+1 < length,
219 "Invalid constant pool entry %u in class file %s",
220 index, CHECK);
221 {
222 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
223 u8 bytes = cfs->get_u8_fast();
224 cp->long_at_put(index, bytes);
225 }
226 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
227 break;
228 case JVM_CONSTANT_Double :
229 // A mangled type might cause you to overrun allocated memory
230 guarantee_property(index+1 < length,
231 "Invalid constant pool entry %u in class file %s",
232 index, CHECK);
233 {
234 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
235 u8 bytes = cfs->get_u8_fast();
236 cp->double_at_put(index, *(jdouble*)&bytes);
237 }
238 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
239 break;
240 case JVM_CONSTANT_NameAndType :
241 {
242 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
243 u2 name_index = cfs->get_u2_fast();
244 u2 signature_index = cfs->get_u2_fast();
245 cp->name_and_type_at_put(index, name_index, signature_index);
246 }
247 break;
248 case JVM_CONSTANT_Utf8 :
249 {
250 cfs->guarantee_more(2, CHECK); // utf8_length
251 u2 utf8_length = cfs->get_u2_fast();
252 u1* utf8_buffer = cfs->get_u1_buffer();
253 assert(utf8_buffer != NULL, "null utf8 buffer");
254 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
255 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
256 cfs->skip_u1_fast(utf8_length);
257
258 // Before storing the symbol, make sure it's legal
259 if (_need_verify) {
260 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
261 }
262
263 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
264 Handle patch = clear_cp_patch_at(index);
265 guarantee_property(java_lang_String::is_instance(patch()),
266 "Illegal utf8 patch at %d in class file %s",
267 index, CHECK);
268 char* str = java_lang_String::as_utf8_string(patch());
269 // (could use java_lang_String::as_symbol instead, but might as well batch them)
270 utf8_buffer = (u1*) str;
271 utf8_length = (int) strlen(str);
272 }
273
274 unsigned int hash;
275 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
276 if (result == NULL) {
277 names[names_count] = (char*)utf8_buffer;
278 lengths[names_count] = utf8_length;
279 indices[names_count] = index;
280 hashValues[names_count++] = hash;
281 if (names_count == SymbolTable::symbol_alloc_batch_size) {
282 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
283 names_count = 0;
284 }
285 } else {
286 cp->symbol_at_put(index, result);
287 }
288 }
289 break;
290 default:
291 classfile_parse_error(
292 "Unknown constant tag %u in class file %s", tag, CHECK);
293 break;
294 }
295 }
296
297 // Allocate the remaining symbols
298 if (names_count > 0) {
299 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
300 }
301
302 // Copy _current pointer of local copy back to stream().
303 #ifdef ASSERT
304 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
305 #endif
306 cfs0->set_current(cfs1.current());
307 }
308
309 // This class unreferences constant pool symbols if an error has occurred
310 // while parsing the class before it is assigned into the class.
311 // If it gets an error after that it is unloaded and the constant pool will
312 // be cleaned up then.
313 class ConstantPoolCleaner : public StackObj {
314 constantPoolHandle _cphandle;
315 bool _in_error;
316 public:
317 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
318 ~ConstantPoolCleaner() {
319 if (_in_error && _cphandle.not_null()) {
320 _cphandle->unreference_symbols();
321 }
322 }
323 void set_in_error(bool clean) { _in_error = clean; }
324 };
325
326 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
327
328 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
329 ClassFileStream* cfs = stream();
330 constantPoolHandle nullHandle;
331
332 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
333 u2 length = cfs->get_u2_fast();
334 guarantee_property(
335 length >= 1, "Illegal constant pool size %u in class file %s",
336 length, CHECK_(nullHandle));
337 constantPoolOop constant_pool =
338 oopFactory::new_constantPool(length,
339 oopDesc::IsSafeConc,
340 CHECK_(nullHandle));
341 constantPoolHandle cp (THREAD, constant_pool);
342
343 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
344 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
345
346 // parsing constant pool entries
347 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
348
349 int index = 1; // declared outside of loops for portability
350
351 // first verification pass - validate cross references and fixup class and string constants
352 for (index = 1; index < length; index++) { // Index 0 is unused
353 jbyte tag = cp->tag_at(index).value();
354 switch (tag) {
355 case JVM_CONSTANT_Class :
356 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
357 break;
358 case JVM_CONSTANT_Fieldref :
359 // fall through
360 case JVM_CONSTANT_Methodref :
361 // fall through
362 case JVM_CONSTANT_InterfaceMethodref : {
363 if (!_need_verify) break;
364 int klass_ref_index = cp->klass_ref_index_at(index);
365 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
366 check_property(valid_cp_range(klass_ref_index, length) &&
367 is_klass_reference(cp, klass_ref_index),
368 "Invalid constant pool index %u in class file %s",
369 klass_ref_index,
370 CHECK_(nullHandle));
371 check_property(valid_cp_range(name_and_type_ref_index, length) &&
372 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
373 "Invalid constant pool index %u in class file %s",
374 name_and_type_ref_index,
375 CHECK_(nullHandle));
376 break;
377 }
378 case JVM_CONSTANT_String :
379 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
380 break;
381 case JVM_CONSTANT_Integer :
382 break;
383 case JVM_CONSTANT_Float :
384 break;
385 case JVM_CONSTANT_Long :
386 case JVM_CONSTANT_Double :
387 index++;
388 check_property(
389 (index < length && cp->tag_at(index).is_invalid()),
390 "Improper constant pool long/double index %u in class file %s",
391 index, CHECK_(nullHandle));
392 break;
393 case JVM_CONSTANT_NameAndType : {
394 if (!_need_verify) break;
395 int name_ref_index = cp->name_ref_index_at(index);
396 int signature_ref_index = cp->signature_ref_index_at(index);
397 check_property(
398 valid_cp_range(name_ref_index, length) &&
399 cp->tag_at(name_ref_index).is_utf8(),
400 "Invalid constant pool index %u in class file %s",
401 name_ref_index, CHECK_(nullHandle));
402 check_property(
403 valid_cp_range(signature_ref_index, length) &&
404 cp->tag_at(signature_ref_index).is_utf8(),
405 "Invalid constant pool index %u in class file %s",
406 signature_ref_index, CHECK_(nullHandle));
407 break;
408 }
409 case JVM_CONSTANT_Utf8 :
410 break;
411 case JVM_CONSTANT_UnresolvedClass : // fall-through
412 case JVM_CONSTANT_UnresolvedClassInError:
413 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
414 break;
415 case JVM_CONSTANT_ClassIndex :
416 {
417 int class_index = cp->klass_index_at(index);
418 check_property(
419 valid_cp_range(class_index, length) &&
420 cp->tag_at(class_index).is_utf8(),
421 "Invalid constant pool index %u in class file %s",
422 class_index, CHECK_(nullHandle));
423 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
424 }
425 break;
426 case JVM_CONSTANT_UnresolvedString :
427 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
428 break;
429 case JVM_CONSTANT_StringIndex :
430 {
431 int string_index = cp->string_index_at(index);
432 check_property(
433 valid_cp_range(string_index, length) &&
434 cp->tag_at(string_index).is_utf8(),
435 "Invalid constant pool index %u in class file %s",
436 string_index, CHECK_(nullHandle));
437 Symbol* sym = cp->symbol_at(string_index);
438 cp->unresolved_string_at_put(index, sym);
439 }
440 break;
441 case JVM_CONSTANT_MethodHandle :
442 {
443 int ref_index = cp->method_handle_index_at(index);
444 check_property(
445 valid_cp_range(ref_index, length) &&
446 EnableInvokeDynamic,
447 "Invalid constant pool index %u in class file %s",
448 ref_index, CHECK_(nullHandle));
449 constantTag tag = cp->tag_at(ref_index);
450 int ref_kind = cp->method_handle_ref_kind_at(index);
451 switch (ref_kind) {
452 case JVM_REF_getField:
453 case JVM_REF_getStatic:
454 case JVM_REF_putField:
455 case JVM_REF_putStatic:
456 check_property(
457 tag.is_field(),
458 "Invalid constant pool index %u in class file %s (not a field)",
459 ref_index, CHECK_(nullHandle));
460 break;
461 case JVM_REF_invokeVirtual:
462 case JVM_REF_invokeStatic:
463 case JVM_REF_invokeSpecial:
464 case JVM_REF_newInvokeSpecial:
465 check_property(
466 tag.is_method(),
467 "Invalid constant pool index %u in class file %s (not a method)",
468 ref_index, CHECK_(nullHandle));
469 break;
470 case JVM_REF_invokeInterface:
471 check_property(
472 tag.is_interface_method(),
473 "Invalid constant pool index %u in class file %s (not an interface method)",
474 ref_index, CHECK_(nullHandle));
475 break;
476 default:
477 classfile_parse_error(
478 "Bad method handle kind at constant pool index %u in class file %s",
479 index, CHECK_(nullHandle));
480 }
481 // Keep the ref_index unchanged. It will be indirected at link-time.
482 }
483 break;
484 case JVM_CONSTANT_MethodType :
485 {
486 int ref_index = cp->method_type_index_at(index);
487 check_property(
488 valid_cp_range(ref_index, length) &&
489 cp->tag_at(ref_index).is_utf8() &&
490 EnableInvokeDynamic,
491 "Invalid constant pool index %u in class file %s",
492 ref_index, CHECK_(nullHandle));
493 }
494 break;
495 case JVM_CONSTANT_InvokeDynamicTrans :
496 case JVM_CONSTANT_InvokeDynamic :
497 {
498 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
499 check_property(valid_cp_range(name_and_type_ref_index, length) &&
500 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
501 "Invalid constant pool index %u in class file %s",
502 name_and_type_ref_index,
503 CHECK_(nullHandle));
504 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
505 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
506 check_property(valid_cp_range(bootstrap_method_ref_index, length) &&
507 cp->tag_at(bootstrap_method_ref_index).is_method_handle(),
508 "Invalid constant pool index %u in class file %s",
509 bootstrap_method_ref_index,
510 CHECK_(nullHandle));
511 }
512 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
513 break;
514 }
515 default:
516 fatal(err_msg("bad constant pool tag value %u",
517 cp->tag_at(index).value()));
518 ShouldNotReachHere();
519 break;
520 } // end of switch
521 } // end of for
522
523 if (_cp_patches != NULL) {
524 // need to treat this_class specially...
525 assert(EnableInvokeDynamic, "");
526 int this_class_index;
527 {
528 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
529 u1* mark = cfs->current();
530 u2 flags = cfs->get_u2_fast();
531 this_class_index = cfs->get_u2_fast();
532 cfs->set_current(mark); // revert to mark
533 }
534
535 for (index = 1; index < length; index++) { // Index 0 is unused
536 if (has_cp_patch_at(index)) {
537 guarantee_property(index != this_class_index,
538 "Illegal constant pool patch to self at %d in class file %s",
539 index, CHECK_(nullHandle));
540 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
541 }
542 }
543 // Ensure that all the patches have been used.
544 for (index = 0; index < _cp_patches->length(); index++) {
545 guarantee_property(!has_cp_patch_at(index),
546 "Unused constant pool patch at %d in class file %s",
547 index, CHECK_(nullHandle));
548 }
549 }
550
551 if (!_need_verify) {
552 cp_in_error.set_in_error(false);
553 return cp;
554 }
555
556 // second verification pass - checks the strings are of the right format.
557 // but not yet to the other entries
558 for (index = 1; index < length; index++) {
559 jbyte tag = cp->tag_at(index).value();
560 switch (tag) {
561 case JVM_CONSTANT_UnresolvedClass: {
562 Symbol* class_name = cp->unresolved_klass_at(index);
563 // check the name, even if _cp_patches will overwrite it
564 verify_legal_class_name(class_name, CHECK_(nullHandle));
565 break;
566 }
567 case JVM_CONSTANT_NameAndType: {
568 if (_need_verify && _major_version >= JAVA_7_VERSION) {
569 int sig_index = cp->signature_ref_index_at(index);
570 int name_index = cp->name_ref_index_at(index);
571 Symbol* name = cp->symbol_at(name_index);
572 Symbol* sig = cp->symbol_at(sig_index);
573 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
574 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
575 } else {
576 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
577 }
578 }
579 break;
580 }
581 case JVM_CONSTANT_Fieldref:
582 case JVM_CONSTANT_Methodref:
583 case JVM_CONSTANT_InterfaceMethodref: {
584 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
585 // already verified to be utf8
586 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
587 // already verified to be utf8
588 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
589 Symbol* name = cp->symbol_at(name_ref_index);
590 Symbol* signature = cp->symbol_at(signature_ref_index);
591 if (tag == JVM_CONSTANT_Fieldref) {
592 verify_legal_field_name(name, CHECK_(nullHandle));
593 if (_need_verify && _major_version >= JAVA_7_VERSION) {
594 // Signature is verified above, when iterating NameAndType_info.
595 // Need only to be sure it's the right type.
596 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
597 throwIllegalSignature(
598 "Field", name, signature, CHECK_(nullHandle));
599 }
600 } else {
601 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
602 }
603 } else {
604 verify_legal_method_name(name, CHECK_(nullHandle));
605 if (_need_verify && _major_version >= JAVA_7_VERSION) {
606 // Signature is verified above, when iterating NameAndType_info.
607 // Need only to be sure it's the right type.
608 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
609 throwIllegalSignature(
610 "Method", name, signature, CHECK_(nullHandle));
611 }
612 } else {
613 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
614 }
615 if (tag == JVM_CONSTANT_Methodref) {
616 // 4509014: If a class method name begins with '<', it must be "<init>".
617 assert(name != NULL, "method name in constant pool is null");
618 unsigned int name_len = name->utf8_length();
619 assert(name_len > 0, "bad method name"); // already verified as legal name
620 if (name->byte_at(0) == '<') {
621 if (name != vmSymbols::object_initializer_name()) {
622 classfile_parse_error(
623 "Bad method name at constant pool index %u in class file %s",
624 name_ref_index, CHECK_(nullHandle));
625 }
626 }
627 }
628 }
629 break;
630 }
631 case JVM_CONSTANT_MethodHandle: {
632 int ref_index = cp->method_handle_index_at(index);
633 int ref_kind = cp->method_handle_ref_kind_at(index);
634 switch (ref_kind) {
635 case JVM_REF_invokeVirtual:
636 case JVM_REF_invokeStatic:
637 case JVM_REF_invokeSpecial:
638 case JVM_REF_newInvokeSpecial:
639 {
640 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
641 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
642 Symbol* name = cp->symbol_at(name_ref_index);
643 if (ref_kind == JVM_REF_newInvokeSpecial) {
644 if (name != vmSymbols::object_initializer_name()) {
645 classfile_parse_error(
646 "Bad constructor name at constant pool index %u in class file %s",
647 name_ref_index, CHECK_(nullHandle));
648 }
649 } else {
650 if (name == vmSymbols::object_initializer_name()) {
651 classfile_parse_error(
652 "Bad method name at constant pool index %u in class file %s",
653 name_ref_index, CHECK_(nullHandle));
654 }
655 }
656 }
657 break;
658 // Other ref_kinds are already fully checked in previous pass.
659 }
660 break;
661 }
662 case JVM_CONSTANT_MethodType: {
663 Symbol* no_name = vmSymbols::type_name(); // place holder
664 Symbol* signature = cp->method_type_signature_at(index);
665 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
666 break;
667 }
668 case JVM_CONSTANT_Utf8: {
669 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
670 }
671 } // end of switch
672 } // end of for
673
674 cp_in_error.set_in_error(false);
675 return cp;
676 }
677
678
679 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
680 assert(EnableInvokeDynamic, "");
681 BasicType patch_type = T_VOID;
682 switch (cp->tag_at(index).value()) {
683
684 case JVM_CONSTANT_UnresolvedClass :
685 // Patching a class means pre-resolving it.
686 // The name in the constant pool is ignored.
687 if (java_lang_Class::is_instance(patch())) {
688 guarantee_property(!java_lang_Class::is_primitive(patch()),
689 "Illegal class patch at %d in class file %s",
690 index, CHECK);
691 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
692 } else {
693 guarantee_property(java_lang_String::is_instance(patch()),
694 "Illegal class patch at %d in class file %s",
695 index, CHECK);
696 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
697 cp->unresolved_klass_at_put(index, name);
698 }
699 break;
700
701 case JVM_CONSTANT_UnresolvedString :
702 // Patching a string means pre-resolving it.
703 // The spelling in the constant pool is ignored.
704 // The constant reference may be any object whatever.
705 // If it is not a real interned string, the constant is referred
706 // to as a "pseudo-string", and must be presented to the CP
707 // explicitly, because it may require scavenging.
708 cp->pseudo_string_at_put(index, patch());
709 break;
710
711 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
712 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
713 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
714 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
715 patch_prim:
716 {
717 jvalue value;
718 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
719 guarantee_property(value_type == patch_type,
720 "Illegal primitive patch at %d in class file %s",
721 index, CHECK);
722 switch (value_type) {
723 case T_INT: cp->int_at_put(index, value.i); break;
724 case T_FLOAT: cp->float_at_put(index, value.f); break;
725 case T_LONG: cp->long_at_put(index, value.j); break;
726 case T_DOUBLE: cp->double_at_put(index, value.d); break;
727 default: assert(false, "");
728 }
729 }
730 break;
731
732 default:
733 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
734 guarantee_property(!has_cp_patch_at(index),
735 "Illegal unexpected patch at %d in class file %s",
736 index, CHECK);
737 return;
738 }
739
740 // On fall-through, mark the patch as used.
741 clear_cp_patch_at(index);
742 }
743
744
745
746 class NameSigHash: public ResourceObj {
747 public:
748 Symbol* _name; // name
749 Symbol* _sig; // signature
750 NameSigHash* _next; // Next entry in hash table
751 };
752
753
754 #define HASH_ROW_SIZE 256
755
756 unsigned int hash(Symbol* name, Symbol* sig) {
757 unsigned int raw_hash = 0;
758 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
759 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
760
761 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
762 }
763
764
765 void initialize_hashtable(NameSigHash** table) {
766 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
767 }
768
769 // Return false if the name/sig combination is found in table.
770 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
771 // The old format checker uses heap sort to find duplicates.
772 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
773 // of table since we don't expect Symbol*'s to move.
774 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
775 assert(name != NULL, "name in constant pool is NULL");
776
777 // First lookup for duplicates
778 int index = hash(name, sig);
779 NameSigHash* entry = table[index];
780 while (entry != NULL) {
781 if (entry->_name == name && entry->_sig == sig) {
782 return false;
783 }
784 entry = entry->_next;
785 }
786
787 // No duplicate is found, allocate a new entry and fill it.
788 entry = new NameSigHash();
789 entry->_name = name;
790 entry->_sig = sig;
791
792 // Insert into hash table
793 entry->_next = table[index];
794 table[index] = entry;
795
796 return true;
797 }
798
799
800 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
801 int length,
802 Handle class_loader,
803 Handle protection_domain,
804 Symbol* class_name,
805 TRAPS) {
806 ClassFileStream* cfs = stream();
807 assert(length > 0, "only called for length>0");
808 objArrayHandle nullHandle;
809 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
810 objArrayHandle interfaces (THREAD, interface_oop);
811
812 int index;
813 for (index = 0; index < length; index++) {
814 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
815 KlassHandle interf;
816 check_property(
817 valid_cp_range(interface_index, cp->length()) &&
818 is_klass_reference(cp, interface_index),
819 "Interface name has bad constant pool index %u in class file %s",
820 interface_index, CHECK_(nullHandle));
821 if (cp->tag_at(interface_index).is_klass()) {
822 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
823 } else {
824 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
825
826 // Don't need to check legal name because it's checked when parsing constant pool.
827 // But need to make sure it's not an array type.
828 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
829 "Bad interface name in class file %s", CHECK_(nullHandle));
830
831 // Call resolve_super so classcircularity is checked
832 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
833 unresolved_klass, class_loader, protection_domain,
834 false, CHECK_(nullHandle));
835 interf = KlassHandle(THREAD, k);
836
837 if (LinkWellKnownClasses) // my super type is well known to me
838 cp->klass_at_put(interface_index, interf()); // eagerly resolve
839 }
840
841 if (!Klass::cast(interf())->is_interface()) {
842 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
843 }
844 interfaces->obj_at_put(index, interf());
845 }
846
847 if (!_need_verify || length <= 1) {
848 return interfaces;
849 }
850
851 // Check if there's any duplicates in interfaces
852 ResourceMark rm(THREAD);
853 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
854 THREAD, NameSigHash*, HASH_ROW_SIZE);
855 initialize_hashtable(interface_names);
856 bool dup = false;
857 {
858 debug_only(No_Safepoint_Verifier nsv;)
859 for (index = 0; index < length; index++) {
860 klassOop k = (klassOop)interfaces->obj_at(index);
861 Symbol* name = instanceKlass::cast(k)->name();
862 // If no duplicates, add (name, NULL) in hashtable interface_names.
863 if (!put_after_lookup(name, NULL, interface_names)) {
864 dup = true;
865 break;
866 }
867 }
868 }
869 if (dup) {
870 classfile_parse_error("Duplicate interface name in class file %s",
871 CHECK_(nullHandle));
872 }
873
874 return interfaces;
875 }
876
877
878 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
879 // Make sure the constant pool entry is of a type appropriate to this field
880 guarantee_property(
881 (constantvalue_index > 0 &&
882 constantvalue_index < cp->length()),
883 "Bad initial value index %u in ConstantValue attribute in class file %s",
884 constantvalue_index, CHECK);
885 constantTag value_type = cp->tag_at(constantvalue_index);
886 switch ( cp->basic_type_for_signature_at(signature_index) ) {
887 case T_LONG:
888 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
889 break;
890 case T_FLOAT:
891 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
892 break;
893 case T_DOUBLE:
894 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
895 break;
896 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
897 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
898 break;
899 case T_OBJECT:
900 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
901 && (value_type.is_string() || value_type.is_unresolved_string())),
902 "Bad string initial value in class file %s", CHECK);
903 break;
904 default:
905 classfile_parse_error(
906 "Unable to set initial value %u in class file %s",
907 constantvalue_index, CHECK);
908 }
909 }
910
911
912 // Parse attributes for a field.
913 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
914 u2 attributes_count,
915 bool is_static, u2 signature_index,
916 u2* constantvalue_index_addr,
917 bool* is_synthetic_addr,
918 u2* generic_signature_index_addr,
919 typeArrayHandle* field_annotations,
920 TRAPS) {
921 ClassFileStream* cfs = stream();
922 assert(attributes_count > 0, "length should be greater than 0");
923 u2 constantvalue_index = 0;
924 u2 generic_signature_index = 0;
925 bool is_synthetic = false;
926 u1* runtime_visible_annotations = NULL;
927 int runtime_visible_annotations_length = 0;
928 u1* runtime_invisible_annotations = NULL;
929 int runtime_invisible_annotations_length = 0;
930 while (attributes_count--) {
931 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
932 u2 attribute_name_index = cfs->get_u2_fast();
933 u4 attribute_length = cfs->get_u4_fast();
934 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
935 cp->tag_at(attribute_name_index).is_utf8(),
936 "Invalid field attribute index %u in class file %s",
937 attribute_name_index,
938 CHECK);
939 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
940 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
941 // ignore if non-static
942 if (constantvalue_index != 0) {
943 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
944 }
945 check_property(
946 attribute_length == 2,
947 "Invalid ConstantValue field attribute length %u in class file %s",
948 attribute_length, CHECK);
949 constantvalue_index = cfs->get_u2(CHECK);
950 if (_need_verify) {
951 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
952 }
953 } else if (attribute_name == vmSymbols::tag_synthetic()) {
954 if (attribute_length != 0) {
955 classfile_parse_error(
956 "Invalid Synthetic field attribute length %u in class file %s",
957 attribute_length, CHECK);
958 }
959 is_synthetic = true;
960 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
961 if (attribute_length != 0) {
962 classfile_parse_error(
963 "Invalid Deprecated field attribute length %u in class file %s",
964 attribute_length, CHECK);
965 }
966 } else if (_major_version >= JAVA_1_5_VERSION) {
967 if (attribute_name == vmSymbols::tag_signature()) {
968 if (attribute_length != 2) {
969 classfile_parse_error(
970 "Wrong size %u for field's Signature attribute in class file %s",
971 attribute_length, CHECK);
972 }
973 generic_signature_index = cfs->get_u2(CHECK);
974 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
975 runtime_visible_annotations_length = attribute_length;
976 runtime_visible_annotations = cfs->get_u1_buffer();
977 assert(runtime_visible_annotations != NULL, "null visible annotations");
978 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
979 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
980 runtime_invisible_annotations_length = attribute_length;
981 runtime_invisible_annotations = cfs->get_u1_buffer();
982 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
983 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
984 } else {
985 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
986 }
987 } else {
988 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
989 }
990 }
991
992 *constantvalue_index_addr = constantvalue_index;
993 *is_synthetic_addr = is_synthetic;
994 *generic_signature_index_addr = generic_signature_index;
995 *field_annotations = assemble_annotations(runtime_visible_annotations,
996 runtime_visible_annotations_length,
997 runtime_invisible_annotations,
998 runtime_invisible_annotations_length,
999 CHECK);
1000 return;
1001 }
1002
1003
1004 // Field allocation types. Used for computing field offsets.
1005
1006 enum FieldAllocationType {
1007 STATIC_OOP, // Oops
1008 STATIC_BYTE, // Boolean, Byte, char
1009 STATIC_SHORT, // shorts
1010 STATIC_WORD, // ints
1011 STATIC_DOUBLE, // long or double
1012 STATIC_ALIGNED_DOUBLE,// aligned long or double
1013 NONSTATIC_OOP,
1014 NONSTATIC_BYTE,
1015 NONSTATIC_SHORT,
1016 NONSTATIC_WORD,
1017 NONSTATIC_DOUBLE,
1018 NONSTATIC_ALIGNED_DOUBLE
1019 };
1020
1021
1022 struct FieldAllocationCount {
1023 unsigned int static_oop_count;
1024 unsigned int static_byte_count;
1025 unsigned int static_short_count;
1026 unsigned int static_word_count;
1027 unsigned int static_double_count;
1028 unsigned int nonstatic_oop_count;
1029 unsigned int nonstatic_byte_count;
1030 unsigned int nonstatic_short_count;
1031 unsigned int nonstatic_word_count;
1032 unsigned int nonstatic_double_count;
1033 };
1034
1035 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
1036 struct FieldAllocationCount *fac,
1037 objArrayHandle* fields_annotations, TRAPS) {
1038 ClassFileStream* cfs = stream();
1039 typeArrayHandle nullHandle;
1040 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1041 u2 length = cfs->get_u2_fast();
1042 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1043 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1044 typeArrayHandle fields(THREAD, new_fields);
1045
1046 int index = 0;
1047 typeArrayHandle field_annotations;
1048 for (int n = 0; n < length; n++) {
1049 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1050
1051 AccessFlags access_flags;
1052 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1053 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1054 access_flags.set_flags(flags);
1055
1056 u2 name_index = cfs->get_u2_fast();
1057 int cp_size = cp->length();
1058 check_property(
1059 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1060 "Invalid constant pool index %u for field name in class file %s",
1061 name_index, CHECK_(nullHandle));
1062 Symbol* name = cp->symbol_at(name_index);
1063 verify_legal_field_name(name, CHECK_(nullHandle));
1064
1065 u2 signature_index = cfs->get_u2_fast();
1066 check_property(
1067 valid_cp_range(signature_index, cp_size) &&
1068 cp->tag_at(signature_index).is_utf8(),
1069 "Invalid constant pool index %u for field signature in class file %s",
1070 signature_index, CHECK_(nullHandle));
1071 Symbol* sig = cp->symbol_at(signature_index);
1072 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1073
1074 u2 constantvalue_index = 0;
1075 bool is_synthetic = false;
1076 u2 generic_signature_index = 0;
1077 bool is_static = access_flags.is_static();
1078
1079 u2 attributes_count = cfs->get_u2_fast();
1080 if (attributes_count > 0) {
1081 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1082 &constantvalue_index, &is_synthetic,
1083 &generic_signature_index, &field_annotations,
1084 CHECK_(nullHandle));
1085 if (field_annotations.not_null()) {
1086 if (fields_annotations->is_null()) {
1087 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1088 *fields_annotations = objArrayHandle(THREAD, md);
1089 }
1090 (*fields_annotations)->obj_at_put(n, field_annotations());
1091 }
1092 if (is_synthetic) {
1093 access_flags.set_is_synthetic();
1094 }
1095 }
1096
1097 fields->short_at_put(index++, access_flags.as_short());
1098 fields->short_at_put(index++, name_index);
1099 fields->short_at_put(index++, signature_index);
1100 fields->short_at_put(index++, constantvalue_index);
1101
1102 // Remember how many oops we encountered and compute allocation type
1103 BasicType type = cp->basic_type_for_signature_at(signature_index);
1104 FieldAllocationType atype;
1105 if ( is_static ) {
1106 switch ( type ) {
1107 case T_BOOLEAN:
1108 case T_BYTE:
1109 fac->static_byte_count++;
1110 atype = STATIC_BYTE;
1111 break;
1112 case T_LONG:
1113 case T_DOUBLE:
1114 if (Universe::field_type_should_be_aligned(type)) {
1115 atype = STATIC_ALIGNED_DOUBLE;
1116 } else {
1117 atype = STATIC_DOUBLE;
1118 }
1119 fac->static_double_count++;
1120 break;
1121 case T_CHAR:
1122 case T_SHORT:
1123 fac->static_short_count++;
1124 atype = STATIC_SHORT;
1125 break;
1126 case T_FLOAT:
1127 case T_INT:
1128 fac->static_word_count++;
1129 atype = STATIC_WORD;
1130 break;
1131 case T_ARRAY:
1132 case T_OBJECT:
1133 fac->static_oop_count++;
1134 atype = STATIC_OOP;
1135 break;
1136 case T_ADDRESS:
1137 case T_VOID:
1138 default:
1139 assert(0, "bad field type");
1140 }
1141 } else {
1142 switch ( type ) {
1143 case T_BOOLEAN:
1144 case T_BYTE:
1145 fac->nonstatic_byte_count++;
1146 atype = NONSTATIC_BYTE;
1147 break;
1148 case T_LONG:
1149 case T_DOUBLE:
1150 if (Universe::field_type_should_be_aligned(type)) {
1151 atype = NONSTATIC_ALIGNED_DOUBLE;
1152 } else {
1153 atype = NONSTATIC_DOUBLE;
1154 }
1155 fac->nonstatic_double_count++;
1156 break;
1157 case T_CHAR:
1158 case T_SHORT:
1159 fac->nonstatic_short_count++;
1160 atype = NONSTATIC_SHORT;
1161 break;
1162 case T_FLOAT:
1163 case T_INT:
1164 fac->nonstatic_word_count++;
1165 atype = NONSTATIC_WORD;
1166 break;
1167 case T_ARRAY:
1168 case T_OBJECT:
1169 fac->nonstatic_oop_count++;
1170 atype = NONSTATIC_OOP;
1171 break;
1172 case T_ADDRESS:
1173 case T_VOID:
1174 default:
1175 assert(0, "bad field type");
1176 }
1177 }
1178
1179 // The correct offset is computed later (all oop fields will be located together)
1180 // We temporarily store the allocation type in the offset field
1181 fields->short_at_put(index++, atype);
1182 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1183 fields->short_at_put(index++, generic_signature_index);
1184 }
1185
1186 if (_need_verify && length > 1) {
1187 // Check duplicated fields
1188 ResourceMark rm(THREAD);
1189 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1190 THREAD, NameSigHash*, HASH_ROW_SIZE);
1191 initialize_hashtable(names_and_sigs);
1192 bool dup = false;
1193 {
1194 debug_only(No_Safepoint_Verifier nsv;)
1195 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1196 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1197 Symbol* name = cp->symbol_at(name_index);
1198 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1199 Symbol* sig = cp->symbol_at(sig_index);
1200 // If no duplicates, add name/signature in hashtable names_and_sigs.
1201 if (!put_after_lookup(name, sig, names_and_sigs)) {
1202 dup = true;
1203 break;
1204 }
1205 }
1206 }
1207 if (dup) {
1208 classfile_parse_error("Duplicate field name&signature in class file %s",
1209 CHECK_(nullHandle));
1210 }
1211 }
1212
1213 return fields;
1214 }
1215
1216
1217 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1218 while (length-- > 0) {
1219 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1220 }
1221 }
1222
1223
1224 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1225 u4 exception_table_length,
1226 constantPoolHandle cp,
1227 TRAPS) {
1228 ClassFileStream* cfs = stream();
1229 typeArrayHandle nullHandle;
1230
1231 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1232 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1233 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1234
1235 int index = 0;
1236 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1237 for (unsigned int i = 0; i < exception_table_length; i++) {
1238 u2 start_pc = cfs->get_u2_fast();
1239 u2 end_pc = cfs->get_u2_fast();
1240 u2 handler_pc = cfs->get_u2_fast();
1241 u2 catch_type_index = cfs->get_u2_fast();
1242 // Will check legal target after parsing code array in verifier.
1243 if (_need_verify) {
1244 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1245 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1246 guarantee_property(handler_pc < code_length,
1247 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1248 if (catch_type_index != 0) {
1249 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1250 is_klass_reference(cp, catch_type_index),
1251 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1252 }
1253 }
1254 exception_handlers->int_at_put(index++, start_pc);
1255 exception_handlers->int_at_put(index++, end_pc);
1256 exception_handlers->int_at_put(index++, handler_pc);
1257 exception_handlers->int_at_put(index++, catch_type_index);
1258 }
1259 return exception_handlers;
1260 }
1261
1262 void ClassFileParser::parse_linenumber_table(
1263 u4 code_attribute_length, u4 code_length,
1264 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1265 ClassFileStream* cfs = stream();
1266 unsigned int num_entries = cfs->get_u2(CHECK);
1267
1268 // Each entry is a u2 start_pc, and a u2 line_number
1269 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1270
1271 // Verify line number attribute and table length
1272 check_property(
1273 code_attribute_length == sizeof(u2) + length_in_bytes,
1274 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1275
1276 cfs->guarantee_more(length_in_bytes, CHECK);
1277
1278 if ((*write_stream) == NULL) {
1279 if (length_in_bytes > fixed_buffer_size) {
1280 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1281 } else {
1282 (*write_stream) = new CompressedLineNumberWriteStream(
1283 linenumbertable_buffer, fixed_buffer_size);
1284 }
1285 }
1286
1287 while (num_entries-- > 0) {
1288 u2 bci = cfs->get_u2_fast(); // start_pc
1289 u2 line = cfs->get_u2_fast(); // line_number
1290 guarantee_property(bci < code_length,
1291 "Invalid pc in LineNumberTable in class file %s", CHECK);
1292 (*write_stream)->write_pair(bci, line);
1293 }
1294 }
1295
1296
1297 // Class file LocalVariableTable elements.
1298 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1299 public:
1300 u2 start_bci;
1301 u2 length;
1302 u2 name_cp_index;
1303 u2 descriptor_cp_index;
1304 u2 slot;
1305 };
1306
1307
1308 class LVT_Hash: public CHeapObj {
1309 public:
1310 LocalVariableTableElement *_elem; // element
1311 LVT_Hash* _next; // Next entry in hash table
1312 };
1313
1314 unsigned int hash(LocalVariableTableElement *elem) {
1315 unsigned int raw_hash = elem->start_bci;
1316
1317 raw_hash = elem->length + raw_hash * 37;
1318 raw_hash = elem->name_cp_index + raw_hash * 37;
1319 raw_hash = elem->slot + raw_hash * 37;
1320
1321 return raw_hash % HASH_ROW_SIZE;
1322 }
1323
1324 void initialize_hashtable(LVT_Hash** table) {
1325 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1326 table[i] = NULL;
1327 }
1328 }
1329
1330 void clear_hashtable(LVT_Hash** table) {
1331 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1332 LVT_Hash* current = table[i];
1333 LVT_Hash* next;
1334 while (current != NULL) {
1335 next = current->_next;
1336 current->_next = NULL;
1337 delete(current);
1338 current = next;
1339 }
1340 table[i] = NULL;
1341 }
1342 }
1343
1344 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1345 LVT_Hash* entry = table[index];
1346
1347 /*
1348 * 3-tuple start_bci/length/slot has to be unique key,
1349 * so the following comparison seems to be redundant:
1350 * && elem->name_cp_index == entry->_elem->name_cp_index
1351 */
1352 while (entry != NULL) {
1353 if (elem->start_bci == entry->_elem->start_bci
1354 && elem->length == entry->_elem->length
1355 && elem->name_cp_index == entry->_elem->name_cp_index
1356 && elem->slot == entry->_elem->slot
1357 ) {
1358 return entry;
1359 }
1360 entry = entry->_next;
1361 }
1362 return NULL;
1363 }
1364
1365 // Return false if the local variable is found in table.
1366 // Return true if no duplicate is found.
1367 // And local variable is added as a new entry in table.
1368 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1369 // First lookup for duplicates
1370 int index = hash(elem);
1371 LVT_Hash* entry = LVT_lookup(elem, index, table);
1372
1373 if (entry != NULL) {
1374 return false;
1375 }
1376 // No duplicate is found, allocate a new entry and fill it.
1377 if ((entry = new LVT_Hash()) == NULL) {
1378 return false;
1379 }
1380 entry->_elem = elem;
1381
1382 // Insert into hash table
1383 entry->_next = table[index];
1384 table[index] = entry;
1385
1386 return true;
1387 }
1388
1389 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1390 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1391 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1392 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1393 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1394 lvt->signature_cp_index = 0;
1395 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1396 }
1397
1398 // Function is used to parse both attributes:
1399 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1400 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1401 u2 max_locals,
1402 u4 code_attribute_length,
1403 constantPoolHandle cp,
1404 u2* localvariable_table_length,
1405 bool isLVTT,
1406 TRAPS) {
1407 ClassFileStream* cfs = stream();
1408 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1409 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1410 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1411 // Verify local variable table attribute has right length
1412 if (_need_verify) {
1413 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1414 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1415 }
1416 u2* localvariable_table_start = cfs->get_u2_buffer();
1417 assert(localvariable_table_start != NULL, "null local variable table");
1418 if (!_need_verify) {
1419 cfs->skip_u2_fast(size);
1420 } else {
1421 cfs->guarantee_more(size * 2, CHECK_NULL);
1422 for(int i = 0; i < (*localvariable_table_length); i++) {
1423 u2 start_pc = cfs->get_u2_fast();
1424 u2 length = cfs->get_u2_fast();
1425 u2 name_index = cfs->get_u2_fast();
1426 u2 descriptor_index = cfs->get_u2_fast();
1427 u2 index = cfs->get_u2_fast();
1428 // Assign to a u4 to avoid overflow
1429 u4 end_pc = (u4)start_pc + (u4)length;
1430
1431 if (start_pc >= code_length) {
1432 classfile_parse_error(
1433 "Invalid start_pc %u in %s in class file %s",
1434 start_pc, tbl_name, CHECK_NULL);
1435 }
1436 if (end_pc > code_length) {
1437 classfile_parse_error(
1438 "Invalid length %u in %s in class file %s",
1439 length, tbl_name, CHECK_NULL);
1440 }
1441 int cp_size = cp->length();
1442 guarantee_property(
1443 valid_cp_range(name_index, cp_size) &&
1444 cp->tag_at(name_index).is_utf8(),
1445 "Name index %u in %s has bad constant type in class file %s",
1446 name_index, tbl_name, CHECK_NULL);
1447 guarantee_property(
1448 valid_cp_range(descriptor_index, cp_size) &&
1449 cp->tag_at(descriptor_index).is_utf8(),
1450 "Signature index %u in %s has bad constant type in class file %s",
1451 descriptor_index, tbl_name, CHECK_NULL);
1452
1453 Symbol* name = cp->symbol_at(name_index);
1454 Symbol* sig = cp->symbol_at(descriptor_index);
1455 verify_legal_field_name(name, CHECK_NULL);
1456 u2 extra_slot = 0;
1457 if (!isLVTT) {
1458 verify_legal_field_signature(name, sig, CHECK_NULL);
1459
1460 // 4894874: check special cases for double and long local variables
1461 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1462 sig == vmSymbols::type_signature(T_LONG)) {
1463 extra_slot = 1;
1464 }
1465 }
1466 guarantee_property((index + extra_slot) < max_locals,
1467 "Invalid index %u in %s in class file %s",
1468 index, tbl_name, CHECK_NULL);
1469 }
1470 }
1471 return localvariable_table_start;
1472 }
1473
1474
1475 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1476 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1477 ClassFileStream* cfs = stream();
1478 u2 index = 0; // index in the array with long/double occupying two slots
1479 u4 i1 = *u1_index;
1480 u4 i2 = *u2_index + 1;
1481 for(int i = 0; i < array_length; i++) {
1482 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1483 index++;
1484 if (tag == ITEM_Long || tag == ITEM_Double) {
1485 index++;
1486 } else if (tag == ITEM_Object) {
1487 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1488 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1489 is_klass_reference(cp, class_index),
1490 "Bad class index %u in StackMap in class file %s",
1491 class_index, CHECK);
1492 } else if (tag == ITEM_Uninitialized) {
1493 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1494 guarantee_property(
1495 offset < code_length,
1496 "Bad uninitialized type offset %u in StackMap in class file %s",
1497 offset, CHECK);
1498 } else {
1499 guarantee_property(
1500 tag <= (u1)ITEM_Uninitialized,
1501 "Unknown variable type %u in StackMap in class file %s",
1502 tag, CHECK);
1503 }
1504 }
1505 u2_array[*u2_index] = index;
1506 *u1_index = i1;
1507 *u2_index = i2;
1508 }
1509
1510 typeArrayOop ClassFileParser::parse_stackmap_table(
1511 u4 code_attribute_length, TRAPS) {
1512 if (code_attribute_length == 0)
1513 return NULL;
1514
1515 ClassFileStream* cfs = stream();
1516 u1* stackmap_table_start = cfs->get_u1_buffer();
1517 assert(stackmap_table_start != NULL, "null stackmap table");
1518
1519 // check code_attribute_length first
1520 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1521
1522 if (!_need_verify && !DumpSharedSpaces) {
1523 return NULL;
1524 }
1525
1526 typeArrayOop stackmap_data =
1527 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1528
1529 stackmap_data->set_length(code_attribute_length);
1530 memcpy((void*)stackmap_data->byte_at_addr(0),
1531 (void*)stackmap_table_start, code_attribute_length);
1532 return stackmap_data;
1533 }
1534
1535 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1536 u4 method_attribute_length,
1537 constantPoolHandle cp, TRAPS) {
1538 ClassFileStream* cfs = stream();
1539 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1540 *checked_exceptions_length = cfs->get_u2_fast();
1541 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1542 u2* checked_exceptions_start = cfs->get_u2_buffer();
1543 assert(checked_exceptions_start != NULL, "null checked exceptions");
1544 if (!_need_verify) {
1545 cfs->skip_u2_fast(size);
1546 } else {
1547 // Verify each value in the checked exception table
1548 u2 checked_exception;
1549 u2 len = *checked_exceptions_length;
1550 cfs->guarantee_more(2 * len, CHECK_NULL);
1551 for (int i = 0; i < len; i++) {
1552 checked_exception = cfs->get_u2_fast();
1553 check_property(
1554 valid_cp_range(checked_exception, cp->length()) &&
1555 is_klass_reference(cp, checked_exception),
1556 "Exception name has bad type at constant pool %u in class file %s",
1557 checked_exception, CHECK_NULL);
1558 }
1559 }
1560 // check exceptions attribute length
1561 if (_need_verify) {
1562 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1563 sizeof(u2) * size),
1564 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1565 }
1566 return checked_exceptions_start;
1567 }
1568
1569 void ClassFileParser::throwIllegalSignature(
1570 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1571 ResourceMark rm(THREAD);
1572 Exceptions::fthrow(THREAD_AND_LOCATION,
1573 vmSymbols::java_lang_ClassFormatError(),
1574 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1575 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1576 }
1577
1578 #define MAX_ARGS_SIZE 255
1579 #define MAX_CODE_SIZE 65535
1580 #define INITIAL_MAX_LVT_NUMBER 256
1581
1582 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1583 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1584 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1585 // entire method attribute is parsed.
1586 //
1587 // The promoted_flags parameter is used to pass relevant access_flags
1588 // from the method back up to the containing klass. These flag values
1589 // are added to klass's access_flags.
1590
1591 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1592 AccessFlags *promoted_flags,
1593 typeArrayHandle* method_annotations,
1594 typeArrayHandle* method_parameter_annotations,
1595 typeArrayHandle* method_default_annotations,
1596 TRAPS) {
1597 ClassFileStream* cfs = stream();
1598 methodHandle nullHandle;
1599 ResourceMark rm(THREAD);
1600 // Parse fixed parts
1601 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1602
1603 int flags = cfs->get_u2_fast();
1604 u2 name_index = cfs->get_u2_fast();
1605 int cp_size = cp->length();
1606 check_property(
1607 valid_cp_range(name_index, cp_size) &&
1608 cp->tag_at(name_index).is_utf8(),
1609 "Illegal constant pool index %u for method name in class file %s",
1610 name_index, CHECK_(nullHandle));
1611 Symbol* name = cp->symbol_at(name_index);
1612 verify_legal_method_name(name, CHECK_(nullHandle));
1613
1614 u2 signature_index = cfs->get_u2_fast();
1615 guarantee_property(
1616 valid_cp_range(signature_index, cp_size) &&
1617 cp->tag_at(signature_index).is_utf8(),
1618 "Illegal constant pool index %u for method signature in class file %s",
1619 signature_index, CHECK_(nullHandle));
1620 Symbol* signature = cp->symbol_at(signature_index);
1621
1622 AccessFlags access_flags;
1623 if (name == vmSymbols::class_initializer_name()) {
1624 // We ignore the other access flags for a valid class initializer.
1625 // (JVM Spec 2nd ed., chapter 4.6)
1626 if (_major_version < 51) { // backward compatibility
1627 flags = JVM_ACC_STATIC;
1628 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1629 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1630 }
1631 } else {
1632 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1633 }
1634
1635 int args_size = -1; // only used when _need_verify is true
1636 if (_need_verify) {
1637 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1638 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1639 if (args_size > MAX_ARGS_SIZE) {
1640 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1641 }
1642 }
1643
1644 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1645
1646 // Default values for code and exceptions attribute elements
1647 u2 max_stack = 0;
1648 u2 max_locals = 0;
1649 u4 code_length = 0;
1650 u1* code_start = 0;
1651 u2 exception_table_length = 0;
1652 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1653 u2 checked_exceptions_length = 0;
1654 u2* checked_exceptions_start = NULL;
1655 CompressedLineNumberWriteStream* linenumber_table = NULL;
1656 int linenumber_table_length = 0;
1657 int total_lvt_length = 0;
1658 u2 lvt_cnt = 0;
1659 u2 lvtt_cnt = 0;
1660 bool lvt_allocated = false;
1661 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1662 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1663 u2* localvariable_table_length;
1664 u2** localvariable_table_start;
1665 u2* localvariable_type_table_length;
1666 u2** localvariable_type_table_start;
1667 bool parsed_code_attribute = false;
1668 bool parsed_checked_exceptions_attribute = false;
1669 bool parsed_stackmap_attribute = false;
1670 // stackmap attribute - JDK1.5
1671 typeArrayHandle stackmap_data;
1672 u2 generic_signature_index = 0;
1673 u1* runtime_visible_annotations = NULL;
1674 int runtime_visible_annotations_length = 0;
1675 u1* runtime_invisible_annotations = NULL;
1676 int runtime_invisible_annotations_length = 0;
1677 u1* runtime_visible_parameter_annotations = NULL;
1678 int runtime_visible_parameter_annotations_length = 0;
1679 u1* runtime_invisible_parameter_annotations = NULL;
1680 int runtime_invisible_parameter_annotations_length = 0;
1681 u1* annotation_default = NULL;
1682 int annotation_default_length = 0;
1683
1684 // Parse code and exceptions attribute
1685 u2 method_attributes_count = cfs->get_u2_fast();
1686 while (method_attributes_count--) {
1687 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1688 u2 method_attribute_name_index = cfs->get_u2_fast();
1689 u4 method_attribute_length = cfs->get_u4_fast();
1690 check_property(
1691 valid_cp_range(method_attribute_name_index, cp_size) &&
1692 cp->tag_at(method_attribute_name_index).is_utf8(),
1693 "Invalid method attribute name index %u in class file %s",
1694 method_attribute_name_index, CHECK_(nullHandle));
1695
1696 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1697 if (method_attribute_name == vmSymbols::tag_code()) {
1698 // Parse Code attribute
1699 if (_need_verify) {
1700 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1701 "Code attribute in native or abstract methods in class file %s",
1702 CHECK_(nullHandle));
1703 }
1704 if (parsed_code_attribute) {
1705 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1706 }
1707 parsed_code_attribute = true;
1708
1709 // Stack size, locals size, and code size
1710 if (_major_version == 45 && _minor_version <= 2) {
1711 cfs->guarantee_more(4, CHECK_(nullHandle));
1712 max_stack = cfs->get_u1_fast();
1713 max_locals = cfs->get_u1_fast();
1714 code_length = cfs->get_u2_fast();
1715 } else {
1716 cfs->guarantee_more(8, CHECK_(nullHandle));
1717 max_stack = cfs->get_u2_fast();
1718 max_locals = cfs->get_u2_fast();
1719 code_length = cfs->get_u4_fast();
1720 }
1721 if (_need_verify) {
1722 guarantee_property(args_size <= max_locals,
1723 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1724 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1725 "Invalid method Code length %u in class file %s",
1726 code_length, CHECK_(nullHandle));
1727 }
1728 // Code pointer
1729 code_start = cfs->get_u1_buffer();
1730 assert(code_start != NULL, "null code start");
1731 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1732 cfs->skip_u1_fast(code_length);
1733
1734 // Exception handler table
1735 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1736 exception_table_length = cfs->get_u2_fast();
1737 if (exception_table_length > 0) {
1738 exception_handlers =
1739 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1740 }
1741
1742 // Parse additional attributes in code attribute
1743 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1744 u2 code_attributes_count = cfs->get_u2_fast();
1745
1746 unsigned int calculated_attribute_length = 0;
1747
1748 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1749 calculated_attribute_length =
1750 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1751 } else {
1752 // max_stack, locals and length are smaller in pre-version 45.2 classes
1753 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1754 }
1755 calculated_attribute_length +=
1756 code_length +
1757 sizeof(exception_table_length) +
1758 sizeof(code_attributes_count) +
1759 exception_table_length *
1760 ( sizeof(u2) + // start_pc
1761 sizeof(u2) + // end_pc
1762 sizeof(u2) + // handler_pc
1763 sizeof(u2) ); // catch_type_index
1764
1765 while (code_attributes_count--) {
1766 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1767 u2 code_attribute_name_index = cfs->get_u2_fast();
1768 u4 code_attribute_length = cfs->get_u4_fast();
1769 calculated_attribute_length += code_attribute_length +
1770 sizeof(code_attribute_name_index) +
1771 sizeof(code_attribute_length);
1772 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1773 cp->tag_at(code_attribute_name_index).is_utf8(),
1774 "Invalid code attribute name index %u in class file %s",
1775 code_attribute_name_index,
1776 CHECK_(nullHandle));
1777 if (LoadLineNumberTables &&
1778 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1779 // Parse and compress line number table
1780 parse_linenumber_table(code_attribute_length, code_length,
1781 &linenumber_table, CHECK_(nullHandle));
1782
1783 } else if (LoadLocalVariableTables &&
1784 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1785 // Parse local variable table
1786 if (!lvt_allocated) {
1787 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1788 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1789 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1790 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1791 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1792 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1793 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1794 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1795 lvt_allocated = true;
1796 }
1797 if (lvt_cnt == max_lvt_cnt) {
1798 max_lvt_cnt <<= 1;
1799 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1800 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1801 }
1802 localvariable_table_start[lvt_cnt] =
1803 parse_localvariable_table(code_length,
1804 max_locals,
1805 code_attribute_length,
1806 cp,
1807 &localvariable_table_length[lvt_cnt],
1808 false, // is not LVTT
1809 CHECK_(nullHandle));
1810 total_lvt_length += localvariable_table_length[lvt_cnt];
1811 lvt_cnt++;
1812 } else if (LoadLocalVariableTypeTables &&
1813 _major_version >= JAVA_1_5_VERSION &&
1814 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1815 if (!lvt_allocated) {
1816 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1817 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1818 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1819 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1820 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1821 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1822 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1823 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1824 lvt_allocated = true;
1825 }
1826 // Parse local variable type table
1827 if (lvtt_cnt == max_lvtt_cnt) {
1828 max_lvtt_cnt <<= 1;
1829 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1830 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1831 }
1832 localvariable_type_table_start[lvtt_cnt] =
1833 parse_localvariable_table(code_length,
1834 max_locals,
1835 code_attribute_length,
1836 cp,
1837 &localvariable_type_table_length[lvtt_cnt],
1838 true, // is LVTT
1839 CHECK_(nullHandle));
1840 lvtt_cnt++;
1841 } else if (UseSplitVerifier &&
1842 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1843 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1844 // Stack map is only needed by the new verifier in JDK1.5.
1845 if (parsed_stackmap_attribute) {
1846 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1847 }
1848 typeArrayOop sm =
1849 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1850 stackmap_data = typeArrayHandle(THREAD, sm);
1851 parsed_stackmap_attribute = true;
1852 } else {
1853 // Skip unknown attributes
1854 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1855 }
1856 }
1857 // check method attribute length
1858 if (_need_verify) {
1859 guarantee_property(method_attribute_length == calculated_attribute_length,
1860 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1861 }
1862 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1863 // Parse Exceptions attribute
1864 if (parsed_checked_exceptions_attribute) {
1865 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1866 }
1867 parsed_checked_exceptions_attribute = true;
1868 checked_exceptions_start =
1869 parse_checked_exceptions(&checked_exceptions_length,
1870 method_attribute_length,
1871 cp, CHECK_(nullHandle));
1872 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1873 if (method_attribute_length != 0) {
1874 classfile_parse_error(
1875 "Invalid Synthetic method attribute length %u in class file %s",
1876 method_attribute_length, CHECK_(nullHandle));
1877 }
1878 // Should we check that there hasn't already been a synthetic attribute?
1879 access_flags.set_is_synthetic();
1880 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1881 if (method_attribute_length != 0) {
1882 classfile_parse_error(
1883 "Invalid Deprecated method attribute length %u in class file %s",
1884 method_attribute_length, CHECK_(nullHandle));
1885 }
1886 } else if (_major_version >= JAVA_1_5_VERSION) {
1887 if (method_attribute_name == vmSymbols::tag_signature()) {
1888 if (method_attribute_length != 2) {
1889 classfile_parse_error(
1890 "Invalid Signature attribute length %u in class file %s",
1891 method_attribute_length, CHECK_(nullHandle));
1892 }
1893 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1894 generic_signature_index = cfs->get_u2_fast();
1895 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1896 runtime_visible_annotations_length = method_attribute_length;
1897 runtime_visible_annotations = cfs->get_u1_buffer();
1898 assert(runtime_visible_annotations != NULL, "null visible annotations");
1899 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1900 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1901 runtime_invisible_annotations_length = method_attribute_length;
1902 runtime_invisible_annotations = cfs->get_u1_buffer();
1903 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1904 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1905 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1906 runtime_visible_parameter_annotations_length = method_attribute_length;
1907 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1908 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1909 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1910 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1911 runtime_invisible_parameter_annotations_length = method_attribute_length;
1912 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1913 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1914 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1915 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1916 annotation_default_length = method_attribute_length;
1917 annotation_default = cfs->get_u1_buffer();
1918 assert(annotation_default != NULL, "null annotation default");
1919 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1920 } else {
1921 // Skip unknown attributes
1922 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1923 }
1924 } else {
1925 // Skip unknown attributes
1926 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1927 }
1928 }
1929
1930 if (linenumber_table != NULL) {
1931 linenumber_table->write_terminator();
1932 linenumber_table_length = linenumber_table->position();
1933 }
1934
1935 // Make sure there's at least one Code attribute in non-native/non-abstract method
1936 if (_need_verify) {
1937 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1938 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1939 }
1940
1941 // All sizing information for a methodOop is finally available, now create it
1942 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1943 total_lvt_length, checked_exceptions_length,
1944 oopDesc::IsSafeConc, CHECK_(nullHandle));
1945 methodHandle m (THREAD, m_oop);
1946
1947 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1948
1949 // Fill in information from fixed part (access_flags already set)
1950 m->set_constants(cp());
1951 m->set_name_index(name_index);
1952 m->set_signature_index(signature_index);
1953 m->set_generic_signature_index(generic_signature_index);
1954 #ifdef CC_INTERP
1955 // hmm is there a gc issue here??
1956 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1957 m->set_result_index(rtf.type());
1958 #endif
1959
1960 if (args_size >= 0) {
1961 m->set_size_of_parameters(args_size);
1962 } else {
1963 m->compute_size_of_parameters(THREAD);
1964 }
1965 #ifdef ASSERT
1966 if (args_size >= 0) {
1967 m->compute_size_of_parameters(THREAD);
1968 assert(args_size == m->size_of_parameters(), "");
1969 }
1970 #endif
1971
1972 // Fill in code attribute information
1973 m->set_max_stack(max_stack);
1974 m->set_max_locals(max_locals);
1975 m->constMethod()->set_stackmap_data(stackmap_data());
1976
1977 /**
1978 * The exception_table field is the flag used to indicate
1979 * that the methodOop and it's associated constMethodOop are partially
1980 * initialized and thus are exempt from pre/post GC verification. Once
1981 * the field is set, the oops are considered fully initialized so make
1982 * sure that the oops can pass verification when this field is set.
1983 */
1984 m->set_exception_table(exception_handlers());
1985
1986 // Copy byte codes
1987 m->set_code(code_start);
1988
1989 // Copy line number table
1990 if (linenumber_table != NULL) {
1991 memcpy(m->compressed_linenumber_table(),
1992 linenumber_table->buffer(), linenumber_table_length);
1993 }
1994
1995 // Copy checked exceptions
1996 if (checked_exceptions_length > 0) {
1997 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1998 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1999 }
2000
2001 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2002 *
2003 * Rules for LVT's and LVTT's are:
2004 * - There can be any number of LVT's and LVTT's.
2005 * - If there are n LVT's, it is the same as if there was just
2006 * one LVT containing all the entries from the n LVT's.
2007 * - There may be no more than one LVT entry per local variable.
2008 * Two LVT entries are 'equal' if these fields are the same:
2009 * start_pc, length, name, slot
2010 * - There may be no more than one LVTT entry per each LVT entry.
2011 * Each LVTT entry has to match some LVT entry.
2012 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2013 */
2014 if (total_lvt_length > 0) {
2015 int tbl_no, idx;
2016
2017 promoted_flags->set_has_localvariable_table();
2018
2019 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2020 initialize_hashtable(lvt_Hash);
2021
2022 // To fill LocalVariableTable in
2023 Classfile_LVT_Element* cf_lvt;
2024 LocalVariableTableElement* lvt = m->localvariable_table_start();
2025
2026 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2027 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2028 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2029 copy_lvt_element(&cf_lvt[idx], lvt);
2030 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2031 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2032 && _need_verify
2033 && _major_version >= JAVA_1_5_VERSION ) {
2034 clear_hashtable(lvt_Hash);
2035 classfile_parse_error("Duplicated LocalVariableTable attribute "
2036 "entry for '%s' in class file %s",
2037 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2038 CHECK_(nullHandle));
2039 }
2040 }
2041 }
2042
2043 // To merge LocalVariableTable and LocalVariableTypeTable
2044 Classfile_LVT_Element* cf_lvtt;
2045 LocalVariableTableElement lvtt_elem;
2046
2047 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2048 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2049 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2050 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2051 int index = hash(&lvtt_elem);
2052 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2053 if (entry == NULL) {
2054 if (_need_verify) {
2055 clear_hashtable(lvt_Hash);
2056 classfile_parse_error("LVTT entry for '%s' in class file %s "
2057 "does not match any LVT entry",
2058 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2059 CHECK_(nullHandle));
2060 }
2061 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2062 clear_hashtable(lvt_Hash);
2063 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2064 "entry for '%s' in class file %s",
2065 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2066 CHECK_(nullHandle));
2067 } else {
2068 // to add generic signatures into LocalVariableTable
2069 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2070 }
2071 }
2072 }
2073 clear_hashtable(lvt_Hash);
2074 }
2075
2076 *method_annotations = assemble_annotations(runtime_visible_annotations,
2077 runtime_visible_annotations_length,
2078 runtime_invisible_annotations,
2079 runtime_invisible_annotations_length,
2080 CHECK_(nullHandle));
2081 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2082 runtime_visible_parameter_annotations_length,
2083 runtime_invisible_parameter_annotations,
2084 runtime_invisible_parameter_annotations_length,
2085 CHECK_(nullHandle));
2086 *method_default_annotations = assemble_annotations(annotation_default,
2087 annotation_default_length,
2088 NULL,
2089 0,
2090 CHECK_(nullHandle));
2091
2092 if (name == vmSymbols::finalize_method_name() &&
2093 signature == vmSymbols::void_method_signature()) {
2094 if (m->is_empty_method()) {
2095 _has_empty_finalizer = true;
2096 } else {
2097 _has_finalizer = true;
2098 }
2099 }
2100 if (name == vmSymbols::object_initializer_name() &&
2101 signature == vmSymbols::void_method_signature() &&
2102 m->is_vanilla_constructor()) {
2103 _has_vanilla_constructor = true;
2104 }
2105
2106 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2107 m->is_method_handle_adapter())) {
2108 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2109 "Method handle invokers must be defined internally to the VM", nullHandle);
2110 }
2111
2112 return m;
2113 }
2114
2115
2116 // The promoted_flags parameter is used to pass relevant access_flags
2117 // from the methods back up to the containing klass. These flag values
2118 // are added to klass's access_flags.
2119
2120 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2121 AccessFlags* promoted_flags,
2122 bool* has_final_method,
2123 objArrayOop* methods_annotations_oop,
2124 objArrayOop* methods_parameter_annotations_oop,
2125 objArrayOop* methods_default_annotations_oop,
2126 TRAPS) {
2127 ClassFileStream* cfs = stream();
2128 objArrayHandle nullHandle;
2129 typeArrayHandle method_annotations;
2130 typeArrayHandle method_parameter_annotations;
2131 typeArrayHandle method_default_annotations;
2132 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2133 u2 length = cfs->get_u2_fast();
2134 if (length == 0) {
2135 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2136 } else {
2137 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2138 objArrayHandle methods(THREAD, m);
2139 HandleMark hm(THREAD);
2140 objArrayHandle methods_annotations;
2141 objArrayHandle methods_parameter_annotations;
2142 objArrayHandle methods_default_annotations;
2143 for (int index = 0; index < length; index++) {
2144 methodHandle method = parse_method(cp, is_interface,
2145 promoted_flags,
2146 &method_annotations,
2147 &method_parameter_annotations,
2148 &method_default_annotations,
2149 CHECK_(nullHandle));
2150 if (method->is_final()) {
2151 *has_final_method = true;
2152 }
2153 methods->obj_at_put(index, method());
2154 if (method_annotations.not_null()) {
2155 if (methods_annotations.is_null()) {
2156 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2157 methods_annotations = objArrayHandle(THREAD, md);
2158 }
2159 methods_annotations->obj_at_put(index, method_annotations());
2160 }
2161 if (method_parameter_annotations.not_null()) {
2162 if (methods_parameter_annotations.is_null()) {
2163 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2164 methods_parameter_annotations = objArrayHandle(THREAD, md);
2165 }
2166 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2167 }
2168 if (method_default_annotations.not_null()) {
2169 if (methods_default_annotations.is_null()) {
2170 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2171 methods_default_annotations = objArrayHandle(THREAD, md);
2172 }
2173 methods_default_annotations->obj_at_put(index, method_default_annotations());
2174 }
2175 }
2176 if (_need_verify && length > 1) {
2177 // Check duplicated methods
2178 ResourceMark rm(THREAD);
2179 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2180 THREAD, NameSigHash*, HASH_ROW_SIZE);
2181 initialize_hashtable(names_and_sigs);
2182 bool dup = false;
2183 {
2184 debug_only(No_Safepoint_Verifier nsv;)
2185 for (int i = 0; i < length; i++) {
2186 methodOop m = (methodOop)methods->obj_at(i);
2187 // If no duplicates, add name/signature in hashtable names_and_sigs.
2188 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2189 dup = true;
2190 break;
2191 }
2192 }
2193 }
2194 if (dup) {
2195 classfile_parse_error("Duplicate method name&signature in class file %s",
2196 CHECK_(nullHandle));
2197 }
2198 }
2199
2200 *methods_annotations_oop = methods_annotations();
2201 *methods_parameter_annotations_oop = methods_parameter_annotations();
2202 *methods_default_annotations_oop = methods_default_annotations();
2203
2204 return methods;
2205 }
2206 }
2207
2208
2209 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2210 objArrayHandle methods_annotations,
2211 objArrayHandle methods_parameter_annotations,
2212 objArrayHandle methods_default_annotations,
2213 TRAPS) {
2214 typeArrayHandle nullHandle;
2215 int length = methods()->length();
2216 // If JVMTI original method ordering is enabled we have to
2217 // remember the original class file ordering.
2218 // We temporarily use the vtable_index field in the methodOop to store the
2219 // class file index, so we can read in after calling qsort.
2220 if (JvmtiExport::can_maintain_original_method_order()) {
2221 for (int index = 0; index < length; index++) {
2222 methodOop m = methodOop(methods->obj_at(index));
2223 assert(!m->valid_vtable_index(), "vtable index should not be set");
2224 m->set_vtable_index(index);
2225 }
2226 }
2227 // Sort method array by ascending method name (for faster lookups & vtable construction)
2228 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2229 methodOopDesc::sort_methods(methods(),
2230 methods_annotations(),
2231 methods_parameter_annotations(),
2232 methods_default_annotations());
2233
2234 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2235 if (JvmtiExport::can_maintain_original_method_order()) {
2236 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2237 typeArrayHandle method_ordering(THREAD, new_ordering);
2238 for (int index = 0; index < length; index++) {
2239 methodOop m = methodOop(methods->obj_at(index));
2240 int old_index = m->vtable_index();
2241 assert(old_index >= 0 && old_index < length, "invalid method index");
2242 method_ordering->int_at_put(index, old_index);
2243 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2244 }
2245 return method_ordering;
2246 } else {
2247 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2248 }
2249 }
2250
2251
2252 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2253 ClassFileStream* cfs = stream();
2254 cfs->guarantee_more(2, CHECK); // sourcefile_index
2255 u2 sourcefile_index = cfs->get_u2_fast();
2256 check_property(
2257 valid_cp_range(sourcefile_index, cp->length()) &&
2258 cp->tag_at(sourcefile_index).is_utf8(),
2259 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2260 sourcefile_index, CHECK);
2261 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2262 }
2263
2264
2265
2266 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2267 instanceKlassHandle k,
2268 int length, TRAPS) {
2269 ClassFileStream* cfs = stream();
2270 u1* sde_buffer = cfs->get_u1_buffer();
2271 assert(sde_buffer != NULL, "null sde buffer");
2272
2273 // Don't bother storing it if there is no way to retrieve it
2274 if (JvmtiExport::can_get_source_debug_extension()) {
2275 // Optimistically assume that only 1 byte UTF format is used
2276 // (common case)
2277 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2278 k->set_source_debug_extension(sde_symbol);
2279 // Note that set_source_debug_extension() increments the reference count
2280 // for its copy of the Symbol*, so use a TempNewSymbol here.
2281 }
2282 // Got utf8 string, set stream position forward
2283 cfs->skip_u1(length, CHECK);
2284 }
2285
2286
2287 // Inner classes can be static, private or protected (classic VM does this)
2288 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2289
2290 // Return number of classes in the inner classes attribute table
2291 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2292 ClassFileStream* cfs = stream();
2293 cfs->guarantee_more(2, CHECK_0); // length
2294 u2 length = cfs->get_u2_fast();
2295
2296 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2297 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2298 typeArrayHandle inner_classes(THREAD, ic);
2299 int index = 0;
2300 int cp_size = cp->length();
2301 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2302 for (int n = 0; n < length; n++) {
2303 // Inner class index
2304 u2 inner_class_info_index = cfs->get_u2_fast();
2305 check_property(
2306 inner_class_info_index == 0 ||
2307 (valid_cp_range(inner_class_info_index, cp_size) &&
2308 is_klass_reference(cp, inner_class_info_index)),
2309 "inner_class_info_index %u has bad constant type in class file %s",
2310 inner_class_info_index, CHECK_0);
2311 // Outer class index
2312 u2 outer_class_info_index = cfs->get_u2_fast();
2313 check_property(
2314 outer_class_info_index == 0 ||
2315 (valid_cp_range(outer_class_info_index, cp_size) &&
2316 is_klass_reference(cp, outer_class_info_index)),
2317 "outer_class_info_index %u has bad constant type in class file %s",
2318 outer_class_info_index, CHECK_0);
2319 // Inner class name
2320 u2 inner_name_index = cfs->get_u2_fast();
2321 check_property(
2322 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2323 cp->tag_at(inner_name_index).is_utf8()),
2324 "inner_name_index %u has bad constant type in class file %s",
2325 inner_name_index, CHECK_0);
2326 if (_need_verify) {
2327 guarantee_property(inner_class_info_index != outer_class_info_index,
2328 "Class is both outer and inner class in class file %s", CHECK_0);
2329 }
2330 // Access flags
2331 AccessFlags inner_access_flags;
2332 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2333 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2334 // Set abstract bit for old class files for backward compatibility
2335 flags |= JVM_ACC_ABSTRACT;
2336 }
2337 verify_legal_class_modifiers(flags, CHECK_0);
2338 inner_access_flags.set_flags(flags);
2339
2340 inner_classes->short_at_put(index++, inner_class_info_index);
2341 inner_classes->short_at_put(index++, outer_class_info_index);
2342 inner_classes->short_at_put(index++, inner_name_index);
2343 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2344 }
2345
2346 // 4347400: make sure there's no duplicate entry in the classes array
2347 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2348 for(int i = 0; i < inner_classes->length(); i += 4) {
2349 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2350 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2351 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2352 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2353 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2354 "Duplicate entry in InnerClasses in class file %s",
2355 CHECK_0);
2356 }
2357 }
2358 }
2359
2360 // Update instanceKlass with inner class info.
2361 k->set_inner_classes(inner_classes());
2362 return length;
2363 }
2364
2365 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2366 k->set_is_synthetic();
2367 }
2368
2369 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2370 ClassFileStream* cfs = stream();
2371 u2 signature_index = cfs->get_u2(CHECK);
2372 check_property(
2373 valid_cp_range(signature_index, cp->length()) &&
2374 cp->tag_at(signature_index).is_utf8(),
2375 "Invalid constant pool index %u in Signature attribute in class file %s",
2376 signature_index, CHECK);
2377 k->set_generic_signature(cp->symbol_at(signature_index));
2378 }
2379
2380 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2381 u4 attribute_byte_length, TRAPS) {
2382 ClassFileStream* cfs = stream();
2383 u1* current_start = cfs->current();
2384
2385 cfs->guarantee_more(2, CHECK); // length
2386 int attribute_array_length = cfs->get_u2_fast();
2387
2388 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2389 "Short length on BootstrapMethods in class file %s",
2390 CHECK);
2391
2392 // The attribute contains a counted array of counted tuples of shorts,
2393 // represending bootstrap specifiers:
2394 // length*{bootstrap_method_index, argument_count*{argument_index}}
2395 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2396 // operand_count = number of shorts in attr, except for leading length
2397
2398 // The attribute is copied into a short[] array.
2399 // The array begins with a series of short[2] pairs, one for each tuple.
2400 int index_size = (attribute_array_length * 2);
2401
2402 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2403 typeArrayHandle operands(THREAD, operands_oop);
2404 operands_oop = NULL; // tidy
2405
2406 int operand_fill_index = index_size;
2407 int cp_size = cp->length();
2408
2409 for (int n = 0; n < attribute_array_length; n++) {
2410 // Store a 32-bit offset into the header of the operand array.
2411 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2412 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2413
2414 // Read a bootstrap specifier.
2415 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2416 u2 bootstrap_method_index = cfs->get_u2_fast();
2417 u2 argument_count = cfs->get_u2_fast();
2418 check_property(
2419 valid_cp_range(bootstrap_method_index, cp_size) &&
2420 cp->tag_at(bootstrap_method_index).is_method_handle(),
2421 "bootstrap_method_index %u has bad constant type in class file %s",
2422 bootstrap_method_index,
2423 CHECK);
2424 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2425 operands->short_at_put(operand_fill_index++, argument_count);
2426
2427 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2428 for (int j = 0; j < argument_count; j++) {
2429 u2 argument_index = cfs->get_u2_fast();
2430 check_property(
2431 valid_cp_range(argument_index, cp_size) &&
2432 cp->tag_at(argument_index).is_loadable_constant(),
2433 "argument_index %u has bad constant type in class file %s",
2434 argument_index,
2435 CHECK);
2436 operands->short_at_put(operand_fill_index++, argument_index);
2437 }
2438 }
2439
2440 assert(operand_fill_index == operands()->length(), "exact fill");
2441 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2442
2443 u1* current_end = cfs->current();
2444 guarantee_property(current_end == current_start + attribute_byte_length,
2445 "Bad length on BootstrapMethods in class file %s",
2446 CHECK);
2447
2448 cp->set_operands(operands());
2449 }
2450
2451
2452 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2453 ClassFileStream* cfs = stream();
2454 // Set inner classes attribute to default sentinel
2455 k->set_inner_classes(Universe::the_empty_short_array());
2456 cfs->guarantee_more(2, CHECK); // attributes_count
2457 u2 attributes_count = cfs->get_u2_fast();
2458 bool parsed_sourcefile_attribute = false;
2459 bool parsed_innerclasses_attribute = false;
2460 bool parsed_enclosingmethod_attribute = false;
2461 bool parsed_bootstrap_methods_attribute = false;
2462 u1* runtime_visible_annotations = NULL;
2463 int runtime_visible_annotations_length = 0;
2464 u1* runtime_invisible_annotations = NULL;
2465 int runtime_invisible_annotations_length = 0;
2466 // Iterate over attributes
2467 while (attributes_count--) {
2468 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2469 u2 attribute_name_index = cfs->get_u2_fast();
2470 u4 attribute_length = cfs->get_u4_fast();
2471 check_property(
2472 valid_cp_range(attribute_name_index, cp->length()) &&
2473 cp->tag_at(attribute_name_index).is_utf8(),
2474 "Attribute name has bad constant pool index %u in class file %s",
2475 attribute_name_index, CHECK);
2476 Symbol* tag = cp->symbol_at(attribute_name_index);
2477 if (tag == vmSymbols::tag_source_file()) {
2478 // Check for SourceFile tag
2479 if (_need_verify) {
2480 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2481 }
2482 if (parsed_sourcefile_attribute) {
2483 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2484 } else {
2485 parsed_sourcefile_attribute = true;
2486 }
2487 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2488 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2489 // Check for SourceDebugExtension tag
2490 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2491 } else if (tag == vmSymbols::tag_inner_classes()) {
2492 // Check for InnerClasses tag
2493 if (parsed_innerclasses_attribute) {
2494 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2495 } else {
2496 parsed_innerclasses_attribute = true;
2497 }
2498 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2499 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2500 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2501 "Wrong InnerClasses attribute length in class file %s", CHECK);
2502 }
2503 } else if (tag == vmSymbols::tag_synthetic()) {
2504 // Check for Synthetic tag
2505 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2506 if (attribute_length != 0) {
2507 classfile_parse_error(
2508 "Invalid Synthetic classfile attribute length %u in class file %s",
2509 attribute_length, CHECK);
2510 }
2511 parse_classfile_synthetic_attribute(cp, k, CHECK);
2512 } else if (tag == vmSymbols::tag_deprecated()) {
2513 // Check for Deprecatd tag - 4276120
2514 if (attribute_length != 0) {
2515 classfile_parse_error(
2516 "Invalid Deprecated classfile attribute length %u in class file %s",
2517 attribute_length, CHECK);
2518 }
2519 } else if (_major_version >= JAVA_1_5_VERSION) {
2520 if (tag == vmSymbols::tag_signature()) {
2521 if (attribute_length != 2) {
2522 classfile_parse_error(
2523 "Wrong Signature attribute length %u in class file %s",
2524 attribute_length, CHECK);
2525 }
2526 parse_classfile_signature_attribute(cp, k, CHECK);
2527 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2528 runtime_visible_annotations_length = attribute_length;
2529 runtime_visible_annotations = cfs->get_u1_buffer();
2530 assert(runtime_visible_annotations != NULL, "null visible annotations");
2531 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2532 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2533 runtime_invisible_annotations_length = attribute_length;
2534 runtime_invisible_annotations = cfs->get_u1_buffer();
2535 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2536 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2537 } else if (tag == vmSymbols::tag_enclosing_method()) {
2538 if (parsed_enclosingmethod_attribute) {
2539 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2540 } else {
2541 parsed_enclosingmethod_attribute = true;
2542 }
2543 cfs->guarantee_more(4, CHECK); // class_index, method_index
2544 u2 class_index = cfs->get_u2_fast();
2545 u2 method_index = cfs->get_u2_fast();
2546 if (class_index == 0) {
2547 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2548 }
2549 // Validate the constant pool indices and types
2550 if (!cp->is_within_bounds(class_index) ||
2551 !is_klass_reference(cp, class_index)) {
2552 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2553 }
2554 if (method_index != 0 &&
2555 (!cp->is_within_bounds(method_index) ||
2556 !cp->tag_at(method_index).is_name_and_type())) {
2557 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2558 }
2559 k->set_enclosing_method_indices(class_index, method_index);
2560 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2561 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2562 if (parsed_bootstrap_methods_attribute)
2563 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2564 parsed_bootstrap_methods_attribute = true;
2565 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2566 } else {
2567 // Unknown attribute
2568 cfs->skip_u1(attribute_length, CHECK);
2569 }
2570 } else {
2571 // Unknown attribute
2572 cfs->skip_u1(attribute_length, CHECK);
2573 }
2574 }
2575 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2576 runtime_visible_annotations_length,
2577 runtime_invisible_annotations,
2578 runtime_invisible_annotations_length,
2579 CHECK);
2580 k->set_class_annotations(annotations());
2581
2582 if (_max_bootstrap_specifier_index >= 0) {
2583 guarantee_property(parsed_bootstrap_methods_attribute,
2584 "Missing BootstrapMethods attribute in class file %s", CHECK);
2585 }
2586 }
2587
2588
2589 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2590 int runtime_visible_annotations_length,
2591 u1* runtime_invisible_annotations,
2592 int runtime_invisible_annotations_length, TRAPS) {
2593 typeArrayHandle annotations;
2594 if (runtime_visible_annotations != NULL ||
2595 runtime_invisible_annotations != NULL) {
2596 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2597 runtime_invisible_annotations_length, CHECK_(annotations));
2598 annotations = typeArrayHandle(THREAD, anno);
2599 if (runtime_visible_annotations != NULL) {
2600 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2601 }
2602 if (runtime_invisible_annotations != NULL) {
2603 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2604 }
2605 }
2606 return annotations;
2607 }
2608
2609
2610 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2611 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2612 // This code is for compatibility with earlier jdk's that do not
2613 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2614 // the check for the "discovered" field should issue a warning if
2615 // the field is not found. For 1.6 this code should be issue a
2616 // fatal error if the "discovered" field is not found.
2617 //
2618 // Increment fac.nonstatic_oop_count so that the start of the
2619 // next type of non-static oops leaves room for the fake oop.
2620 // Do not increment next_nonstatic_oop_offset so that the
2621 // fake oop is place after the java.lang.ref.Reference oop
2622 // fields.
2623 //
2624 // Check the fields in java.lang.ref.Reference for the "discovered"
2625 // field. If it is not present, artifically create a field for it.
2626 // This allows this VM to run on early JDK where the field is not
2627 // present.
2628 int reference_sig_index = 0;
2629 int reference_name_index = 0;
2630 int reference_index = 0;
2631 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2632 const int n = (*fields_ptr)()->length();
2633 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2634 int name_index =
2635 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2636 int sig_index =
2637 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2638 Symbol* f_name = cp->symbol_at(name_index);
2639 Symbol* f_sig = cp->symbol_at(sig_index);
2640 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2641 // Save the index for reference signature for later use.
2642 // The fake discovered field does not entries in the
2643 // constant pool so the index for its signature cannot
2644 // be extracted from the constant pool. It will need
2645 // later, however. It's signature is vmSymbols::reference_signature()
2646 // so same an index for that signature.
2647 reference_sig_index = sig_index;
2648 reference_name_index = name_index;
2649 reference_index = i;
2650 }
2651 if (f_name == vmSymbols::reference_discovered_name() &&
2652 f_sig == vmSymbols::reference_signature()) {
2653 // The values below are fake but will force extra
2654 // non-static oop fields and a corresponding non-static
2655 // oop map block to be allocated.
2656 extra = 0;
2657 break;
2658 }
2659 }
2660 if (extra != 0) {
2661 fac_ptr->nonstatic_oop_count += extra;
2662 // Add the additional entry to "fields" so that the klass
2663 // contains the "discoverd" field and the field will be initialized
2664 // in instances of the object.
2665 int fields_with_fix_length = (*fields_ptr)()->length() +
2666 instanceKlass::next_offset;
2667 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2668 fields_with_fix_length, CHECK);
2669 typeArrayHandle fields_with_fix(THREAD, ff);
2670
2671 // Take everything from the original but the length.
2672 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2673 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2674 }
2675
2676 // Add the fake field at the end.
2677 int i = (*fields_ptr)->length();
2678 // There is no name index for the fake "discovered" field nor
2679 // signature but a signature is needed so that the field will
2680 // be properly initialized. Use one found for
2681 // one of the other reference fields. Be sure the index for the
2682 // name is 0. In fieldDescriptor::initialize() the index of the
2683 // name is checked. That check is by passed for the last nonstatic
2684 // oop field in a java.lang.ref.Reference which is assumed to be
2685 // this artificial "discovered" field. An assertion checks that
2686 // the name index is 0.
2687 assert(reference_index != 0, "Missing signature for reference");
2688
2689 int j;
2690 for (j = 0; j < instanceKlass::next_offset; j++) {
2691 fields_with_fix->ushort_at_put(i + j,
2692 (*fields_ptr)->ushort_at(reference_index +j));
2693 }
2694 // Clear the public access flag and set the private access flag.
2695 short flags;
2696 flags =
2697 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2698 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2699 flags = flags & (~JVM_ACC_PUBLIC);
2700 flags = flags | JVM_ACC_PRIVATE;
2701 AccessFlags access_flags;
2702 access_flags.set_flags(flags);
2703 assert(!access_flags.is_public(), "Failed to clear public flag");
2704 assert(access_flags.is_private(), "Failed to set private flag");
2705 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2706 flags);
2707
2708 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2709 == reference_name_index, "The fake reference name is incorrect");
2710 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2711 == reference_sig_index, "The fake reference signature is incorrect");
2712 // The type of the field is stored in the low_offset entry during
2713 // parsing.
2714 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2715 NONSTATIC_OOP, "The fake reference type is incorrect");
2716
2717 // "fields" is allocated in the permanent generation. Disgard
2718 // it and let it be collected.
2719 (*fields_ptr) = fields_with_fix;
2720 }
2721 return;
2722 }
2723
2724
2725 void ClassFileParser::java_lang_Class_fix_pre(int* nonstatic_field_size,
2726 FieldAllocationCount *fac_ptr) {
2727 // Add fake fields for java.lang.Class instances
2728 //
2729 // This is not particularly nice. We should consider adding a
2730 // private transient object field at the Java level to
2731 // java.lang.Class. Alternatively we could add a subclass of
2732 // instanceKlass which provides an accessor and size computer for
2733 // this field, but that appears to be more code than this hack.
2734 //
2735 // NOTE that we wedge these in at the beginning rather than the
2736 // end of the object because the Class layout changed between JDK
2737 // 1.3 and JDK 1.4 with the new reflection implementation; some
2738 // nonstatic oop fields were added at the Java level. The offsets
2739 // of these fake fields can't change between these two JDK
2740 // versions because when the offsets are computed at bootstrap
2741 // time we don't know yet which version of the JDK we're running in.
2742
2743 // The values below are fake but will force three non-static oop fields and
2744 // a corresponding non-static oop map block to be allocated.
2745 const int extra = java_lang_Class::number_of_fake_oop_fields;
2746 fac_ptr->nonstatic_oop_count += extra;
2747
2748 // Reserve some leading space for fake ints
2749 *nonstatic_field_size += align_size_up(java_lang_Class::hc_number_of_fake_int_fields * BytesPerInt, heapOopSize) / heapOopSize;
2750 }
2751
2752
2753 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2754 // Cause the extra fake fields in java.lang.Class to show up before
2755 // the Java fields for layout compatibility between 1.3 and 1.4
2756 // Incrementing next_nonstatic_oop_offset here advances the
2757 // location where the real java fields are placed.
2758 const int extra = java_lang_Class::number_of_fake_oop_fields;
2759 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2760 }
2761
2762
2763 // Force MethodHandle.vmentry to be an unmanaged pointer.
2764 // There is no way for a classfile to express this, so we must help it.
2765 void ClassFileParser::java_lang_invoke_MethodHandle_fix_pre(constantPoolHandle cp,
2766 typeArrayHandle fields,
2767 FieldAllocationCount *fac_ptr,
2768 TRAPS) {
2769 // Add fake fields for java.lang.invoke.MethodHandle instances
2770 //
2771 // This is not particularly nice, but since there is no way to express
2772 // a native wordSize field in Java, we must do it at this level.
2773
2774 if (!EnableInvokeDynamic) return;
2775
2776 int word_sig_index = 0;
2777 const int cp_size = cp->length();
2778 for (int index = 1; index < cp_size; index++) {
2779 if (cp->tag_at(index).is_utf8() &&
2780 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2781 word_sig_index = index;
2782 break;
2783 }
2784 }
2785
2786 if (AllowTransitionalJSR292 && word_sig_index == 0) return;
2787 if (word_sig_index == 0)
2788 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2789 "missing I or J signature (for vmentry) in java.lang.invoke.MethodHandle");
2790
2791 // Find vmentry field and change the signature.
2792 bool found_vmentry = false;
2793 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) {
2794 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
2795 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
2796 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset);
2797 Symbol* f_name = cp->symbol_at(name_index);
2798 Symbol* f_sig = cp->symbol_at(sig_index);
2799 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) {
2800 if (f_sig == vmSymbols::machine_word_signature()) {
2801 // If the signature of vmentry is already changed, we're done.
2802 found_vmentry = true;
2803 break;
2804 }
2805 else if (f_sig == vmSymbols::byte_signature()) {
2806 // Adjust the field type from byte to an unmanaged pointer.
2807 assert(fac_ptr->nonstatic_byte_count > 0, "");
2808 fac_ptr->nonstatic_byte_count -= 1;
2809
2810 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2811 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2812 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2813 else fac_ptr->nonstatic_word_count += 1;
2814
2815 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
2816 assert(atype == NONSTATIC_BYTE, "");
2817 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2818 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2819
2820 found_vmentry = true;
2821 break;
2822 }
2823 }
2824 }
2825
2826 if (AllowTransitionalJSR292 && !found_vmentry) return;
2827 if (!found_vmentry)
2828 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2829 "missing vmentry byte field in java.lang.invoke.MethodHandle");
2830 }
2831
2832
2833 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2834 Handle class_loader,
2835 Handle protection_domain,
2836 KlassHandle host_klass,
2837 GrowableArray<Handle>* cp_patches,
2838 TempNewSymbol& parsed_name,
2839 bool verify,
2840 TRAPS) {
2841 // So that JVMTI can cache class file in the state before retransformable agents
2842 // have modified it
2843 unsigned char *cached_class_file_bytes = NULL;
2844 jint cached_class_file_length;
2845
2846 ClassFileStream* cfs = stream();
2847 // Timing
2848 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2849 JavaThread* jt = (JavaThread*) THREAD;
2850
2851 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2852 ClassLoader::perf_class_parse_selftime(),
2853 NULL,
2854 jt->get_thread_stat()->perf_recursion_counts_addr(),
2855 jt->get_thread_stat()->perf_timers_addr(),
2856 PerfClassTraceTime::PARSE_CLASS);
2857
2858 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2859 _max_bootstrap_specifier_index = -1;
2860
2861 if (JvmtiExport::should_post_class_file_load_hook()) {
2862 unsigned char* ptr = cfs->buffer();
2863 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2864
2865 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2866 &ptr, &end_ptr,
2867 &cached_class_file_bytes,
2868 &cached_class_file_length);
2869
2870 if (ptr != cfs->buffer()) {
2871 // JVMTI agent has modified class file data.
2872 // Set new class file stream using JVMTI agent modified
2873 // class file data.
2874 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2875 set_stream(cfs);
2876 }
2877 }
2878
2879 _host_klass = host_klass;
2880 _cp_patches = cp_patches;
2881
2882 instanceKlassHandle nullHandle;
2883
2884 // Figure out whether we can skip format checking (matching classic VM behavior)
2885 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2886
2887 // Set the verify flag in stream
2888 cfs->set_verify(_need_verify);
2889
2890 // Save the class file name for easier error message printing.
2891 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2892
2893 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2894 // Magic value
2895 u4 magic = cfs->get_u4_fast();
2896 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2897 "Incompatible magic value %u in class file %s",
2898 magic, CHECK_(nullHandle));
2899
2900 // Version numbers
2901 u2 minor_version = cfs->get_u2_fast();
2902 u2 major_version = cfs->get_u2_fast();
2903
2904 // Check version numbers - we check this even with verifier off
2905 if (!is_supported_version(major_version, minor_version)) {
2906 if (name == NULL) {
2907 Exceptions::fthrow(
2908 THREAD_AND_LOCATION,
2909 vmSymbols::java_lang_UnsupportedClassVersionError(),
2910 "Unsupported major.minor version %u.%u",
2911 major_version,
2912 minor_version);
2913 } else {
2914 ResourceMark rm(THREAD);
2915 Exceptions::fthrow(
2916 THREAD_AND_LOCATION,
2917 vmSymbols::java_lang_UnsupportedClassVersionError(),
2918 "%s : Unsupported major.minor version %u.%u",
2919 name->as_C_string(),
2920 major_version,
2921 minor_version);
2922 }
2923 return nullHandle;
2924 }
2925
2926 _major_version = major_version;
2927 _minor_version = minor_version;
2928
2929
2930 // Check if verification needs to be relaxed for this class file
2931 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2932 _relax_verify = Verifier::relax_verify_for(class_loader());
2933
2934 // Constant pool
2935 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2936 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2937
2938 int cp_size = cp->length();
2939
2940 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2941
2942 // Access flags
2943 AccessFlags access_flags;
2944 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2945
2946 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2947 // Set abstract bit for old class files for backward compatibility
2948 flags |= JVM_ACC_ABSTRACT;
2949 }
2950 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2951 access_flags.set_flags(flags);
2952
2953 // This class and superclass
2954 instanceKlassHandle super_klass;
2955 u2 this_class_index = cfs->get_u2_fast();
2956 check_property(
2957 valid_cp_range(this_class_index, cp_size) &&
2958 cp->tag_at(this_class_index).is_unresolved_klass(),
2959 "Invalid this class index %u in constant pool in class file %s",
2960 this_class_index, CHECK_(nullHandle));
2961
2962 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2963 assert(class_name != NULL, "class_name can't be null");
2964
2965 // It's important to set parsed_name *before* resolving the super class.
2966 // (it's used for cleanup by the caller if parsing fails)
2967 parsed_name = class_name;
2968 // parsed_name is returned and can be used if there's an error, so add to
2969 // its reference count. Caller will decrement the refcount.
2970 parsed_name->increment_refcount();
2971
2972 // Update _class_name which could be null previously to be class_name
2973 _class_name = class_name;
2974
2975 // Don't need to check whether this class name is legal or not.
2976 // It has been checked when constant pool is parsed.
2977 // However, make sure it is not an array type.
2978 if (_need_verify) {
2979 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2980 "Bad class name in class file %s",
2981 CHECK_(nullHandle));
2982 }
2983
2984 klassOop preserve_this_klass; // for storing result across HandleMark
2985
2986 // release all handles when parsing is done
2987 { HandleMark hm(THREAD);
2988
2989 // Checks if name in class file matches requested name
2990 if (name != NULL && class_name != name) {
2991 ResourceMark rm(THREAD);
2992 Exceptions::fthrow(
2993 THREAD_AND_LOCATION,
2994 vmSymbols::java_lang_NoClassDefFoundError(),
2995 "%s (wrong name: %s)",
2996 name->as_C_string(),
2997 class_name->as_C_string()
2998 );
2999 return nullHandle;
3000 }
3001
3002 if (TraceClassLoadingPreorder) {
3003 tty->print("[Loading %s", name->as_klass_external_name());
3004 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3005 tty->print_cr("]");
3006 }
3007
3008 u2 super_class_index = cfs->get_u2_fast();
3009 if (super_class_index == 0) {
3010 check_property(class_name == vmSymbols::java_lang_Object(),
3011 "Invalid superclass index %u in class file %s",
3012 super_class_index,
3013 CHECK_(nullHandle));
3014 } else {
3015 check_property(valid_cp_range(super_class_index, cp_size) &&
3016 is_klass_reference(cp, super_class_index),
3017 "Invalid superclass index %u in class file %s",
3018 super_class_index,
3019 CHECK_(nullHandle));
3020 // The class name should be legal because it is checked when parsing constant pool.
3021 // However, make sure it is not an array type.
3022 bool is_array = false;
3023 if (cp->tag_at(super_class_index).is_klass()) {
3024 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3025 if (_need_verify)
3026 is_array = super_klass->oop_is_array();
3027 } else if (_need_verify) {
3028 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3029 }
3030 if (_need_verify) {
3031 guarantee_property(!is_array,
3032 "Bad superclass name in class file %s", CHECK_(nullHandle));
3033 }
3034 }
3035
3036 // Interfaces
3037 u2 itfs_len = cfs->get_u2_fast();
3038 objArrayHandle local_interfaces;
3039 if (itfs_len == 0) {
3040 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3041 } else {
3042 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3043 }
3044
3045 // Fields (offsets are filled in later)
3046 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
3047 objArrayHandle fields_annotations;
3048 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
3049 // Methods
3050 bool has_final_method = false;
3051 AccessFlags promoted_flags;
3052 promoted_flags.set_flags(0);
3053 // These need to be oop pointers because they are allocated lazily
3054 // inside parse_methods inside a nested HandleMark
3055 objArrayOop methods_annotations_oop = NULL;
3056 objArrayOop methods_parameter_annotations_oop = NULL;
3057 objArrayOop methods_default_annotations_oop = NULL;
3058 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3059 &promoted_flags,
3060 &has_final_method,
3061 &methods_annotations_oop,
3062 &methods_parameter_annotations_oop,
3063 &methods_default_annotations_oop,
3064 CHECK_(nullHandle));
3065
3066 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3067 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3068 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3069
3070 // We check super class after class file is parsed and format is checked
3071 if (super_class_index > 0 && super_klass.is_null()) {
3072 Symbol* sk = cp->klass_name_at(super_class_index);
3073 if (access_flags.is_interface()) {
3074 // Before attempting to resolve the superclass, check for class format
3075 // errors not checked yet.
3076 guarantee_property(sk == vmSymbols::java_lang_Object(),
3077 "Interfaces must have java.lang.Object as superclass in class file %s",
3078 CHECK_(nullHandle));
3079 }
3080 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3081 sk,
3082 class_loader,
3083 protection_domain,
3084 true,
3085 CHECK_(nullHandle));
3086
3087 KlassHandle kh (THREAD, k);
3088 super_klass = instanceKlassHandle(THREAD, kh());
3089 if (LinkWellKnownClasses) // my super class is well known to me
3090 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3091 }
3092 if (super_klass.not_null()) {
3093 if (super_klass->is_interface()) {
3094 ResourceMark rm(THREAD);
3095 Exceptions::fthrow(
3096 THREAD_AND_LOCATION,
3097 vmSymbols::java_lang_IncompatibleClassChangeError(),
3098 "class %s has interface %s as super class",
3099 class_name->as_klass_external_name(),
3100 super_klass->external_name()
3101 );
3102 return nullHandle;
3103 }
3104 // Make sure super class is not final
3105 if (super_klass->is_final()) {
3106 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3107 }
3108 }
3109
3110 // Compute the transitive list of all unique interfaces implemented by this class
3111 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3112
3113 // sort methods
3114 typeArrayHandle method_ordering = sort_methods(methods,
3115 methods_annotations,
3116 methods_parameter_annotations,
3117 methods_default_annotations,
3118 CHECK_(nullHandle));
3119
3120 // promote flags from parse_methods() to the klass' flags
3121 access_flags.add_promoted_flags(promoted_flags.as_int());
3122
3123 // Size of Java vtable (in words)
3124 int vtable_size = 0;
3125 int itable_size = 0;
3126 int num_miranda_methods = 0;
3127
3128 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3129 num_miranda_methods,
3130 super_klass(),
3131 methods(),
3132 access_flags,
3133 class_loader,
3134 class_name,
3135 local_interfaces(),
3136 CHECK_(nullHandle));
3137
3138 // Size of Java itable (in words)
3139 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3140
3141 // Field size and offset computation
3142 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3143 #ifndef PRODUCT
3144 int orig_nonstatic_field_size = 0;
3145 #endif
3146 int static_field_size = 0;
3147 int next_static_oop_offset;
3148 int next_static_double_offset;
3149 int next_static_word_offset;
3150 int next_static_short_offset;
3151 int next_static_byte_offset;
3152 int next_static_type_offset;
3153 int next_nonstatic_oop_offset;
3154 int next_nonstatic_double_offset;
3155 int next_nonstatic_word_offset;
3156 int next_nonstatic_short_offset;
3157 int next_nonstatic_byte_offset;
3158 int next_nonstatic_type_offset;
3159 int first_nonstatic_oop_offset;
3160 int first_nonstatic_field_offset;
3161 int next_nonstatic_field_offset;
3162
3163 // Calculate the starting byte offsets
3164 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3165 next_static_double_offset = next_static_oop_offset +
3166 (fac.static_oop_count * heapOopSize);
3167 if ( fac.static_double_count &&
3168 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3169 Universe::field_type_should_be_aligned(T_LONG)) ) {
3170 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3171 }
3172
3173 next_static_word_offset = next_static_double_offset +
3174 (fac.static_double_count * BytesPerLong);
3175 next_static_short_offset = next_static_word_offset +
3176 (fac.static_word_count * BytesPerInt);
3177 next_static_byte_offset = next_static_short_offset +
3178 (fac.static_short_count * BytesPerShort);
3179 next_static_type_offset = align_size_up((next_static_byte_offset +
3180 fac.static_byte_count ), wordSize );
3181 static_field_size = (next_static_type_offset -
3182 next_static_oop_offset) / wordSize;
3183
3184 // Add fake fields for java.lang.Class instances (also see below)
3185 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3186 java_lang_Class_fix_pre(&nonstatic_field_size, &fac);
3187 }
3188
3189 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3190 nonstatic_field_size * heapOopSize;
3191 next_nonstatic_field_offset = first_nonstatic_field_offset;
3192
3193 // adjust the vmentry field declaration in java.lang.invoke.MethodHandle
3194 if (EnableInvokeDynamic && class_name == vmSymbols::java_lang_invoke_MethodHandle() && class_loader.is_null()) {
3195 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3196 }
3197 if (AllowTransitionalJSR292 &&
3198 EnableInvokeDynamic && class_name == vmSymbols::java_dyn_MethodHandle() && class_loader.is_null()) {
3199 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3200 }
3201 if (AllowTransitionalJSR292 &&
3202 EnableInvokeDynamic && class_name == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3203 // allow vmentry field in MethodHandleImpl also
3204 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3205 }
3206
3207 // Add a fake "discovered" field if it is not present
3208 // for compatibility with earlier jdk's.
3209 if (class_name == vmSymbols::java_lang_ref_Reference()
3210 && class_loader.is_null()) {
3211 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3212 }
3213 // end of "discovered" field compactibility fix
3214
3215 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3216 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3217 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3218 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3219 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3220
3221 bool super_has_nonstatic_fields =
3222 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3223 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3224 ((nonstatic_double_count + nonstatic_word_count +
3225 nonstatic_short_count + nonstatic_byte_count +
3226 nonstatic_oop_count) != 0);
3227
3228
3229 // Prepare list of oops for oop map generation.
3230 int* nonstatic_oop_offsets;
3231 unsigned int* nonstatic_oop_counts;
3232 unsigned int nonstatic_oop_map_count = 0;
3233
3234 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3235 THREAD, int, nonstatic_oop_count + 1);
3236 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3237 THREAD, unsigned int, nonstatic_oop_count + 1);
3238
3239 // Add fake fields for java.lang.Class instances (also see above).
3240 // FieldsAllocationStyle and CompactFields values will be reset to default.
3241 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3242 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3243 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3244 const uint fake_oop_count = (next_nonstatic_field_offset -
3245 first_nonstatic_field_offset) / heapOopSize;
3246 nonstatic_oop_counts[0] = fake_oop_count;
3247 nonstatic_oop_map_count = 1;
3248 nonstatic_oop_count -= fake_oop_count;
3249 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3250 } else {
3251 first_nonstatic_oop_offset = 0; // will be set for first oop field
3252 }
3253
3254 #ifndef PRODUCT
3255 if( PrintCompactFieldsSavings ) {
3256 next_nonstatic_double_offset = next_nonstatic_field_offset +
3257 (nonstatic_oop_count * heapOopSize);
3258 if ( nonstatic_double_count > 0 ) {
3259 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3260 }
3261 next_nonstatic_word_offset = next_nonstatic_double_offset +
3262 (nonstatic_double_count * BytesPerLong);
3263 next_nonstatic_short_offset = next_nonstatic_word_offset +
3264 (nonstatic_word_count * BytesPerInt);
3265 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3266 (nonstatic_short_count * BytesPerShort);
3267 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3268 nonstatic_byte_count ), heapOopSize );
3269 orig_nonstatic_field_size = nonstatic_field_size +
3270 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3271 }
3272 #endif
3273 bool compact_fields = CompactFields;
3274 int allocation_style = FieldsAllocationStyle;
3275 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3276 assert(false, "0 <= FieldsAllocationStyle <= 2");
3277 allocation_style = 1; // Optimistic
3278 }
3279
3280 // The next classes have predefined hard-coded fields offsets
3281 // (see in JavaClasses::compute_hard_coded_offsets()).
3282 // Use default fields allocation order for them.
3283 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3284 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3285 class_name == vmSymbols::java_lang_Class() ||
3286 class_name == vmSymbols::java_lang_ClassLoader() ||
3287 class_name == vmSymbols::java_lang_ref_Reference() ||
3288 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3289 class_name == vmSymbols::java_lang_StackTraceElement() ||
3290 class_name == vmSymbols::java_lang_String() ||
3291 class_name == vmSymbols::java_lang_Throwable() ||
3292 class_name == vmSymbols::java_lang_Boolean() ||
3293 class_name == vmSymbols::java_lang_Character() ||
3294 class_name == vmSymbols::java_lang_Float() ||
3295 class_name == vmSymbols::java_lang_Double() ||
3296 class_name == vmSymbols::java_lang_Byte() ||
3297 class_name == vmSymbols::java_lang_Short() ||
3298 class_name == vmSymbols::java_lang_Integer() ||
3299 class_name == vmSymbols::java_lang_Long())) {
3300 allocation_style = 0; // Allocate oops first
3301 compact_fields = false; // Don't compact fields
3302 }
3303
3304 if( allocation_style == 0 ) {
3305 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3306 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3307 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3308 (nonstatic_oop_count * heapOopSize);
3309 } else if( allocation_style == 1 ) {
3310 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3311 next_nonstatic_double_offset = next_nonstatic_field_offset;
3312 } else if( allocation_style == 2 ) {
3313 // Fields allocation: oops fields in super and sub classes are together.
3314 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3315 super_klass->nonstatic_oop_map_size() > 0 ) {
3316 int map_size = super_klass->nonstatic_oop_map_size();
3317 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3318 OopMapBlock* last_map = first_map + map_size - 1;
3319 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3320 if (next_offset == next_nonstatic_field_offset) {
3321 allocation_style = 0; // allocate oops first
3322 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3323 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3324 (nonstatic_oop_count * heapOopSize);
3325 }
3326 }
3327 if( allocation_style == 2 ) {
3328 allocation_style = 1; // allocate oops last
3329 next_nonstatic_double_offset = next_nonstatic_field_offset;
3330 }
3331 } else {
3332 ShouldNotReachHere();
3333 }
3334
3335 int nonstatic_oop_space_count = 0;
3336 int nonstatic_word_space_count = 0;
3337 int nonstatic_short_space_count = 0;
3338 int nonstatic_byte_space_count = 0;
3339 int nonstatic_oop_space_offset;
3340 int nonstatic_word_space_offset;
3341 int nonstatic_short_space_offset;
3342 int nonstatic_byte_space_offset;
3343
3344 if( nonstatic_double_count > 0 ) {
3345 int offset = next_nonstatic_double_offset;
3346 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3347 if( compact_fields && offset != next_nonstatic_double_offset ) {
3348 // Allocate available fields into the gap before double field.
3349 int length = next_nonstatic_double_offset - offset;
3350 assert(length == BytesPerInt, "");
3351 nonstatic_word_space_offset = offset;
3352 if( nonstatic_word_count > 0 ) {
3353 nonstatic_word_count -= 1;
3354 nonstatic_word_space_count = 1; // Only one will fit
3355 length -= BytesPerInt;
3356 offset += BytesPerInt;
3357 }
3358 nonstatic_short_space_offset = offset;
3359 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3360 nonstatic_short_count -= 1;
3361 nonstatic_short_space_count += 1;
3362 length -= BytesPerShort;
3363 offset += BytesPerShort;
3364 }
3365 nonstatic_byte_space_offset = offset;
3366 while( length > 0 && nonstatic_byte_count > 0 ) {
3367 nonstatic_byte_count -= 1;
3368 nonstatic_byte_space_count += 1;
3369 length -= 1;
3370 }
3371 // Allocate oop field in the gap if there are no other fields for that.
3372 nonstatic_oop_space_offset = offset;
3373 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3374 allocation_style != 0 ) { // when oop fields not first
3375 nonstatic_oop_count -= 1;
3376 nonstatic_oop_space_count = 1; // Only one will fit
3377 length -= heapOopSize;
3378 offset += heapOopSize;
3379 }
3380 }
3381 }
3382
3383 next_nonstatic_word_offset = next_nonstatic_double_offset +
3384 (nonstatic_double_count * BytesPerLong);
3385 next_nonstatic_short_offset = next_nonstatic_word_offset +
3386 (nonstatic_word_count * BytesPerInt);
3387 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3388 (nonstatic_short_count * BytesPerShort);
3389
3390 int notaligned_offset;
3391 if( allocation_style == 0 ) {
3392 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3393 } else { // allocation_style == 1
3394 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3395 if( nonstatic_oop_count > 0 ) {
3396 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3397 }
3398 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3399 }
3400 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3401 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3402 - first_nonstatic_field_offset)/heapOopSize);
3403
3404 // Iterate over fields again and compute correct offsets.
3405 // The field allocation type was temporarily stored in the offset slot.
3406 // oop fields are located before non-oop fields (static and non-static).
3407 int len = fields->length();
3408 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3409 int real_offset;
3410 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3411 switch (atype) {
3412 case STATIC_OOP:
3413 real_offset = next_static_oop_offset;
3414 next_static_oop_offset += heapOopSize;
3415 break;
3416 case STATIC_BYTE:
3417 real_offset = next_static_byte_offset;
3418 next_static_byte_offset += 1;
3419 break;
3420 case STATIC_SHORT:
3421 real_offset = next_static_short_offset;
3422 next_static_short_offset += BytesPerShort;
3423 break;
3424 case STATIC_WORD:
3425 real_offset = next_static_word_offset;
3426 next_static_word_offset += BytesPerInt;
3427 break;
3428 case STATIC_ALIGNED_DOUBLE:
3429 case STATIC_DOUBLE:
3430 real_offset = next_static_double_offset;
3431 next_static_double_offset += BytesPerLong;
3432 break;
3433 case NONSTATIC_OOP:
3434 if( nonstatic_oop_space_count > 0 ) {
3435 real_offset = nonstatic_oop_space_offset;
3436 nonstatic_oop_space_offset += heapOopSize;
3437 nonstatic_oop_space_count -= 1;
3438 } else {
3439 real_offset = next_nonstatic_oop_offset;
3440 next_nonstatic_oop_offset += heapOopSize;
3441 }
3442 // Update oop maps
3443 if( nonstatic_oop_map_count > 0 &&
3444 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3445 real_offset -
3446 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3447 heapOopSize ) {
3448 // Extend current oop map
3449 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3450 } else {
3451 // Create new oop map
3452 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3453 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3454 nonstatic_oop_map_count += 1;
3455 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3456 first_nonstatic_oop_offset = real_offset;
3457 }
3458 }
3459 break;
3460 case NONSTATIC_BYTE:
3461 if( nonstatic_byte_space_count > 0 ) {
3462 real_offset = nonstatic_byte_space_offset;
3463 nonstatic_byte_space_offset += 1;
3464 nonstatic_byte_space_count -= 1;
3465 } else {
3466 real_offset = next_nonstatic_byte_offset;
3467 next_nonstatic_byte_offset += 1;
3468 }
3469 break;
3470 case NONSTATIC_SHORT:
3471 if( nonstatic_short_space_count > 0 ) {
3472 real_offset = nonstatic_short_space_offset;
3473 nonstatic_short_space_offset += BytesPerShort;
3474 nonstatic_short_space_count -= 1;
3475 } else {
3476 real_offset = next_nonstatic_short_offset;
3477 next_nonstatic_short_offset += BytesPerShort;
3478 }
3479 break;
3480 case NONSTATIC_WORD:
3481 if( nonstatic_word_space_count > 0 ) {
3482 real_offset = nonstatic_word_space_offset;
3483 nonstatic_word_space_offset += BytesPerInt;
3484 nonstatic_word_space_count -= 1;
3485 } else {
3486 real_offset = next_nonstatic_word_offset;
3487 next_nonstatic_word_offset += BytesPerInt;
3488 }
3489 break;
3490 case NONSTATIC_ALIGNED_DOUBLE:
3491 case NONSTATIC_DOUBLE:
3492 real_offset = next_nonstatic_double_offset;
3493 next_nonstatic_double_offset += BytesPerLong;
3494 break;
3495 default:
3496 ShouldNotReachHere();
3497 }
3498 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3499 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3500 }
3501
3502 // Size of instances
3503 int instance_size;
3504
3505 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3506 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3507
3508 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3509
3510 // Number of non-static oop map blocks allocated at end of klass.
3511 const unsigned int total_oop_map_count =
3512 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3513 first_nonstatic_oop_offset);
3514
3515 // Compute reference type
3516 ReferenceType rt;
3517 if (super_klass() == NULL) {
3518 rt = REF_NONE;
3519 } else {
3520 rt = super_klass->reference_type();
3521 }
3522
3523 // We can now create the basic klassOop for this klass
3524 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3525 static_field_size,
3526 total_oop_map_count,
3527 rt, CHECK_(nullHandle));
3528 instanceKlassHandle this_klass (THREAD, ik);
3529
3530 assert(this_klass->static_field_size() == static_field_size, "sanity");
3531 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3532 "sanity");
3533
3534 // Fill in information already parsed
3535 this_klass->set_access_flags(access_flags);
3536 this_klass->set_should_verify_class(verify);
3537 jint lh = Klass::instance_layout_helper(instance_size, false);
3538 this_klass->set_layout_helper(lh);
3539 assert(this_klass->oop_is_instance(), "layout is correct");
3540 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3541 // Not yet: supers are done below to support the new subtype-checking fields
3542 //this_klass->set_super(super_klass());
3543 this_klass->set_class_loader(class_loader());
3544 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3545 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3546 this_klass->set_static_oop_field_count(fac.static_oop_count);
3547 cp->set_pool_holder(this_klass());
3548 error_handler.set_in_error(false); // turn off error handler for cp
3549 this_klass->set_constants(cp());
3550 this_klass->set_local_interfaces(local_interfaces());
3551 this_klass->set_fields(fields());
3552 this_klass->set_methods(methods());
3553 if (has_final_method) {
3554 this_klass->set_has_final_method();
3555 }
3556 this_klass->set_method_ordering(method_ordering());
3557 // The instanceKlass::_methods_jmethod_ids cache and the
3558 // instanceKlass::_methods_cached_itable_indices cache are
3559 // both managed on the assumption that the initial cache
3560 // size is equal to the number of methods in the class. If
3561 // that changes, then instanceKlass::idnum_can_increment()
3562 // has to be changed accordingly.
3563 this_klass->set_initial_method_idnum(methods->length());
3564 this_klass->set_name(cp->klass_name_at(this_class_index));
3565 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3566 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3567 this_klass->set_protection_domain(protection_domain());
3568 this_klass->set_fields_annotations(fields_annotations());
3569 this_klass->set_methods_annotations(methods_annotations());
3570 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3571 this_klass->set_methods_default_annotations(methods_default_annotations());
3572
3573 this_klass->set_minor_version(minor_version);
3574 this_klass->set_major_version(major_version);
3575
3576 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3577 // (We used to do this lazily, but now we query it in Rewriter,
3578 // which is eagerly done for every method, so we might as well do it now,
3579 // when everything is fresh in memory.)
3580 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3581 for (int j = 0; j < methods->length(); j++) {
3582 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3583 }
3584 }
3585
3586 if (cached_class_file_bytes != NULL) {
3587 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3588 this_klass->set_cached_class_file(cached_class_file_bytes,
3589 cached_class_file_length);
3590 }
3591
3592 // Miranda methods
3593 if ((num_miranda_methods > 0) ||
3594 // if this class introduced new miranda methods or
3595 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3596 // super class exists and this class inherited miranda methods
3597 ) {
3598 this_klass->set_has_miranda_methods(); // then set a flag
3599 }
3600
3601 // Additional attributes
3602 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3603
3604 // Make sure this is the end of class file stream
3605 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3606
3607 // VerifyOops believes that once this has been set, the object is completely loaded.
3608 // Compute transitive closure of interfaces this class implements
3609 this_klass->set_transitive_interfaces(transitive_interfaces());
3610
3611 // Fill in information needed to compute superclasses.
3612 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3613
3614 // Initialize itable offset tables
3615 klassItable::setup_itable_offset_table(this_klass);
3616
3617 // Do final class setup
3618 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3619
3620 set_precomputed_flags(this_klass);
3621
3622 // reinitialize modifiers, using the InnerClasses attribute
3623 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3624 this_klass->set_modifier_flags(computed_modifiers);
3625
3626 // check if this class can access its super class
3627 check_super_class_access(this_klass, CHECK_(nullHandle));
3628
3629 // check if this class can access its superinterfaces
3630 check_super_interface_access(this_klass, CHECK_(nullHandle));
3631
3632 // check if this class overrides any final method
3633 check_final_method_override(this_klass, CHECK_(nullHandle));
3634
3635 // check that if this class is an interface then it doesn't have static methods
3636 if (this_klass->is_interface()) {
3637 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3638 }
3639
3640 // Allocate mirror and initialize static fields
3641 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3642
3643 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3644 false /* not shared class */);
3645
3646 if (TraceClassLoading) {
3647 // print in a single call to reduce interleaving of output
3648 if (cfs->source() != NULL) {
3649 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3650 cfs->source());
3651 } else if (class_loader.is_null()) {
3652 if (THREAD->is_Java_thread()) {
3653 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3654 tty->print("[Loaded %s by instance of %s]\n",
3655 this_klass->external_name(),
3656 instanceKlass::cast(caller)->external_name());
3657 } else {
3658 tty->print("[Loaded %s]\n", this_klass->external_name());
3659 }
3660 } else {
3661 ResourceMark rm;
3662 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3663 instanceKlass::cast(class_loader->klass())->external_name());
3664 }
3665 }
3666
3667 if (TraceClassResolution) {
3668 // print out the superclass.
3669 const char * from = Klass::cast(this_klass())->external_name();
3670 if (this_klass->java_super() != NULL) {
3671 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3672 }
3673 // print out each of the interface classes referred to by this class.
3674 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3675 if (!local_interfaces.is_null()) {
3676 int length = local_interfaces->length();
3677 for (int i = 0; i < length; i++) {
3678 klassOop k = klassOop(local_interfaces->obj_at(i));
3679 instanceKlass* to_class = instanceKlass::cast(k);
3680 const char * to = to_class->external_name();
3681 tty->print("RESOLVE %s %s (interface)\n", from, to);
3682 }
3683 }
3684 }
3685
3686 #ifndef PRODUCT
3687 if( PrintCompactFieldsSavings ) {
3688 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3689 tty->print("[Saved %d of %d bytes in %s]\n",
3690 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3691 orig_nonstatic_field_size*heapOopSize,
3692 this_klass->external_name());
3693 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3694 tty->print("[Wasted %d over %d bytes in %s]\n",
3695 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3696 orig_nonstatic_field_size*heapOopSize,
3697 this_klass->external_name());
3698 }
3699 }
3700 #endif
3701
3702 // preserve result across HandleMark
3703 preserve_this_klass = this_klass();
3704 }
3705
3706 // Create new handle outside HandleMark
3707 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3708 debug_only(this_klass->as_klassOop()->verify();)
3709
3710 return this_klass;
3711 }
3712
3713
3714 unsigned int
3715 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3716 unsigned int nonstatic_oop_map_count,
3717 int first_nonstatic_oop_offset) {
3718 unsigned int map_count =
3719 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3720 if (nonstatic_oop_map_count > 0) {
3721 // We have oops to add to map
3722 if (map_count == 0) {
3723 map_count = nonstatic_oop_map_count;
3724 } else {
3725 // Check whether we should add a new map block or whether the last one can
3726 // be extended
3727 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3728 OopMapBlock* const last_map = first_map + map_count - 1;
3729
3730 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3731 if (next_offset == first_nonstatic_oop_offset) {
3732 // There is no gap bettwen superklass's last oop field and first
3733 // local oop field, merge maps.
3734 nonstatic_oop_map_count -= 1;
3735 } else {
3736 // Superklass didn't end with a oop field, add extra maps
3737 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3738 }
3739 map_count += nonstatic_oop_map_count;
3740 }
3741 }
3742 return map_count;
3743 }
3744
3745
3746 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3747 unsigned int nonstatic_oop_map_count,
3748 int* nonstatic_oop_offsets,
3749 unsigned int* nonstatic_oop_counts) {
3750 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3751 const instanceKlass* const super = k->superklass();
3752 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3753 if (super_count > 0) {
3754 // Copy maps from superklass
3755 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3756 for (unsigned int i = 0; i < super_count; ++i) {
3757 *this_oop_map++ = *super_oop_map++;
3758 }
3759 }
3760
3761 if (nonstatic_oop_map_count > 0) {
3762 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3763 // The counts differ because there is no gap between superklass's last oop
3764 // field and the first local oop field. Extend the last oop map copied
3765 // from the superklass instead of creating new one.
3766 nonstatic_oop_map_count--;
3767 nonstatic_oop_offsets++;
3768 this_oop_map--;
3769 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3770 this_oop_map++;
3771 }
3772
3773 // Add new map blocks, fill them
3774 while (nonstatic_oop_map_count-- > 0) {
3775 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3776 this_oop_map->set_count(*nonstatic_oop_counts++);
3777 this_oop_map++;
3778 }
3779 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3780 this_oop_map, "sanity");
3781 }
3782 }
3783
3784
3785 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3786 klassOop super = k->super();
3787
3788 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3789 // in which case we don't have to register objects as finalizable
3790 if (!_has_empty_finalizer) {
3791 if (_has_finalizer ||
3792 (super != NULL && super->klass_part()->has_finalizer())) {
3793 k->set_has_finalizer();
3794 }
3795 }
3796
3797 #ifdef ASSERT
3798 bool f = false;
3799 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3800 vmSymbols::void_method_signature());
3801 if (m != NULL && !m->is_empty_method()) {
3802 f = true;
3803 }
3804 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3805 #endif
3806
3807 // Check if this klass supports the java.lang.Cloneable interface
3808 if (SystemDictionary::Cloneable_klass_loaded()) {
3809 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3810 k->set_is_cloneable();
3811 }
3812 }
3813
3814 // Check if this klass has a vanilla default constructor
3815 if (super == NULL) {
3816 // java.lang.Object has empty default constructor
3817 k->set_has_vanilla_constructor();
3818 } else {
3819 if (Klass::cast(super)->has_vanilla_constructor() &&
3820 _has_vanilla_constructor) {
3821 k->set_has_vanilla_constructor();
3822 }
3823 #ifdef ASSERT
3824 bool v = false;
3825 if (Klass::cast(super)->has_vanilla_constructor()) {
3826 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3827 ), vmSymbols::void_method_signature());
3828 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3829 v = true;
3830 }
3831 }
3832 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3833 #endif
3834 }
3835
3836 // If it cannot be fast-path allocated, set a bit in the layout helper.
3837 // See documentation of instanceKlass::can_be_fastpath_allocated().
3838 assert(k->size_helper() > 0, "layout_helper is initialized");
3839 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3840 || k->is_abstract() || k->is_interface()
3841 || (k->name() == vmSymbols::java_lang_Class()
3842 && k->class_loader() == NULL)
3843 || k->size_helper() >= FastAllocateSizeLimit) {
3844 // Forbid fast-path allocation.
3845 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3846 k->set_layout_helper(lh);
3847 }
3848 }
3849
3850
3851 // utility method for appending and array with check for duplicates
3852
3853 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3854 // iterate over new interfaces
3855 for (int i = 0; i < ifs->length(); i++) {
3856 oop e = ifs->obj_at(i);
3857 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3858 // check for duplicates
3859 bool duplicate = false;
3860 for (int j = 0; j < index; j++) {
3861 if (result->obj_at(j) == e) {
3862 duplicate = true;
3863 break;
3864 }
3865 }
3866 // add new interface
3867 if (!duplicate) {
3868 result->obj_at_put(index++, e);
3869 }
3870 }
3871 }
3872
3873 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3874 // Compute maximum size for transitive interfaces
3875 int max_transitive_size = 0;
3876 int super_size = 0;
3877 // Add superclass transitive interfaces size
3878 if (super.not_null()) {
3879 super_size = super->transitive_interfaces()->length();
3880 max_transitive_size += super_size;
3881 }
3882 // Add local interfaces' super interfaces
3883 int local_size = local_ifs->length();
3884 for (int i = 0; i < local_size; i++) {
3885 klassOop l = klassOop(local_ifs->obj_at(i));
3886 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3887 }
3888 // Finally add local interfaces
3889 max_transitive_size += local_size;
3890 // Construct array
3891 objArrayHandle result;
3892 if (max_transitive_size == 0) {
3893 // no interfaces, use canonicalized array
3894 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3895 } else if (max_transitive_size == super_size) {
3896 // no new local interfaces added, share superklass' transitive interface array
3897 result = objArrayHandle(THREAD, super->transitive_interfaces());
3898 } else if (max_transitive_size == local_size) {
3899 // only local interfaces added, share local interface array
3900 result = local_ifs;
3901 } else {
3902 objArrayHandle nullHandle;
3903 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3904 result = objArrayHandle(THREAD, new_objarray);
3905 int index = 0;
3906 // Copy down from superclass
3907 if (super.not_null()) {
3908 append_interfaces(result, index, super->transitive_interfaces());
3909 }
3910 // Copy down from local interfaces' superinterfaces
3911 for (int i = 0; i < local_ifs->length(); i++) {
3912 klassOop l = klassOop(local_ifs->obj_at(i));
3913 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3914 }
3915 // Finally add local interfaces
3916 append_interfaces(result, index, local_ifs());
3917
3918 // Check if duplicates were removed
3919 if (index != max_transitive_size) {
3920 assert(index < max_transitive_size, "just checking");
3921 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3922 for (int i = 0; i < index; i++) {
3923 oop e = result->obj_at(i);
3924 assert(e != NULL, "just checking");
3925 new_result->obj_at_put(i, e);
3926 }
3927 result = objArrayHandle(THREAD, new_result);
3928 }
3929 }
3930 return result;
3931 }
3932
3933
3934 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3935 klassOop super = this_klass->super();
3936 if ((super != NULL) &&
3937 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3938 ResourceMark rm(THREAD);
3939 Exceptions::fthrow(
3940 THREAD_AND_LOCATION,
3941 vmSymbols::java_lang_IllegalAccessError(),
3942 "class %s cannot access its superclass %s",
3943 this_klass->external_name(),
3944 instanceKlass::cast(super)->external_name()
3945 );
3946 return;
3947 }
3948 }
3949
3950
3951 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3952 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3953 int lng = local_interfaces->length();
3954 for (int i = lng - 1; i >= 0; i--) {
3955 klassOop k = klassOop(local_interfaces->obj_at(i));
3956 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3957 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3958 ResourceMark rm(THREAD);
3959 Exceptions::fthrow(
3960 THREAD_AND_LOCATION,
3961 vmSymbols::java_lang_IllegalAccessError(),
3962 "class %s cannot access its superinterface %s",
3963 this_klass->external_name(),
3964 instanceKlass::cast(k)->external_name()
3965 );
3966 return;
3967 }
3968 }
3969 }
3970
3971
3972 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3973 objArrayHandle methods (THREAD, this_klass->methods());
3974 int num_methods = methods->length();
3975
3976 // go thru each method and check if it overrides a final method
3977 for (int index = 0; index < num_methods; index++) {
3978 methodOop m = (methodOop)methods->obj_at(index);
3979
3980 // skip private, static and <init> methods
3981 if ((!m->is_private()) &&
3982 (!m->is_static()) &&
3983 (m->name() != vmSymbols::object_initializer_name())) {
3984
3985 Symbol* name = m->name();
3986 Symbol* signature = m->signature();
3987 klassOop k = this_klass->super();
3988 methodOop super_m = NULL;
3989 while (k != NULL) {
3990 // skip supers that don't have final methods.
3991 if (k->klass_part()->has_final_method()) {
3992 // lookup a matching method in the super class hierarchy
3993 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3994 if (super_m == NULL) {
3995 break; // didn't find any match; get out
3996 }
3997
3998 if (super_m->is_final() &&
3999 // matching method in super is final
4000 (Reflection::verify_field_access(this_klass->as_klassOop(),
4001 super_m->method_holder(),
4002 super_m->method_holder(),
4003 super_m->access_flags(), false))
4004 // this class can access super final method and therefore override
4005 ) {
4006 ResourceMark rm(THREAD);
4007 Exceptions::fthrow(
4008 THREAD_AND_LOCATION,
4009 vmSymbols::java_lang_VerifyError(),
4010 "class %s overrides final method %s.%s",
4011 this_klass->external_name(),
4012 name->as_C_string(),
4013 signature->as_C_string()
4014 );
4015 return;
4016 }
4017
4018 // continue to look from super_m's holder's super.
4019 k = instanceKlass::cast(super_m->method_holder())->super();
4020 continue;
4021 }
4022
4023 k = k->klass_part()->super();
4024 }
4025 }
4026 }
4027 }
4028
4029
4030 // assumes that this_klass is an interface
4031 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4032 assert(this_klass->is_interface(), "not an interface");
4033 objArrayHandle methods (THREAD, this_klass->methods());
4034 int num_methods = methods->length();
4035
4036 for (int index = 0; index < num_methods; index++) {
4037 methodOop m = (methodOop)methods->obj_at(index);
4038 // if m is static and not the init method, throw a verify error
4039 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4040 ResourceMark rm(THREAD);
4041 Exceptions::fthrow(
4042 THREAD_AND_LOCATION,
4043 vmSymbols::java_lang_VerifyError(),
4044 "Illegal static method %s in interface %s",
4045 m->name()->as_C_string(),
4046 this_klass->external_name()
4047 );
4048 return;
4049 }
4050 }
4051 }
4052
4053 // utility methods for format checking
4054
4055 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4056 if (!_need_verify) { return; }
4057
4058 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4059 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4060 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4061 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4062 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4063 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4064 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4065
4066 if ((is_abstract && is_final) ||
4067 (is_interface && !is_abstract) ||
4068 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4069 (!is_interface && major_gte_15 && is_annotation)) {
4070 ResourceMark rm(THREAD);
4071 Exceptions::fthrow(
4072 THREAD_AND_LOCATION,
4073 vmSymbols::java_lang_ClassFormatError(),
4074 "Illegal class modifiers in class %s: 0x%X",
4075 _class_name->as_C_string(), flags
4076 );
4077 return;
4078 }
4079 }
4080
4081 bool ClassFileParser::has_illegal_visibility(jint flags) {
4082 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4083 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4084 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4085
4086 return ((is_public && is_protected) ||
4087 (is_public && is_private) ||
4088 (is_protected && is_private));
4089 }
4090
4091 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4092 u2 max_version =
4093 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4094 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4095 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4096 (major <= max_version) &&
4097 ((major != max_version) ||
4098 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4099 }
4100
4101 void ClassFileParser::verify_legal_field_modifiers(
4102 jint flags, bool is_interface, TRAPS) {
4103 if (!_need_verify) { return; }
4104
4105 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4106 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4107 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4108 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4109 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4110 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4111 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4112 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4113 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4114
4115 bool is_illegal = false;
4116
4117 if (is_interface) {
4118 if (!is_public || !is_static || !is_final || is_private ||
4119 is_protected || is_volatile || is_transient ||
4120 (major_gte_15 && is_enum)) {
4121 is_illegal = true;
4122 }
4123 } else { // not interface
4124 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4125 is_illegal = true;
4126 }
4127 }
4128
4129 if (is_illegal) {
4130 ResourceMark rm(THREAD);
4131 Exceptions::fthrow(
4132 THREAD_AND_LOCATION,
4133 vmSymbols::java_lang_ClassFormatError(),
4134 "Illegal field modifiers in class %s: 0x%X",
4135 _class_name->as_C_string(), flags);
4136 return;
4137 }
4138 }
4139
4140 void ClassFileParser::verify_legal_method_modifiers(
4141 jint flags, bool is_interface, Symbol* name, TRAPS) {
4142 if (!_need_verify) { return; }
4143
4144 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4145 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4146 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4147 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4148 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4149 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4150 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4151 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4152 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4153 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4154 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4155
4156 bool is_illegal = false;
4157
4158 if (is_interface) {
4159 if (!is_abstract || !is_public || is_static || is_final ||
4160 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4161 is_illegal = true;
4162 }
4163 } else { // not interface
4164 if (is_initializer) {
4165 if (is_static || is_final || is_synchronized || is_native ||
4166 is_abstract || (major_gte_15 && is_bridge)) {
4167 is_illegal = true;
4168 }
4169 } else { // not initializer
4170 if (is_abstract) {
4171 if ((is_final || is_native || is_private || is_static ||
4172 (major_gte_15 && (is_synchronized || is_strict)))) {
4173 is_illegal = true;
4174 }
4175 }
4176 if (has_illegal_visibility(flags)) {
4177 is_illegal = true;
4178 }
4179 }
4180 }
4181
4182 if (is_illegal) {
4183 ResourceMark rm(THREAD);
4184 Exceptions::fthrow(
4185 THREAD_AND_LOCATION,
4186 vmSymbols::java_lang_ClassFormatError(),
4187 "Method %s in class %s has illegal modifiers: 0x%X",
4188 name->as_C_string(), _class_name->as_C_string(), flags);
4189 return;
4190 }
4191 }
4192
4193 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4194 assert(_need_verify, "only called when _need_verify is true");
4195 int i = 0;
4196 int count = length >> 2;
4197 for (int k=0; k<count; k++) {
4198 unsigned char b0 = buffer[i];
4199 unsigned char b1 = buffer[i+1];
4200 unsigned char b2 = buffer[i+2];
4201 unsigned char b3 = buffer[i+3];
4202 // For an unsigned char v,
4203 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4204 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4205 unsigned char res = b0 | b0 - 1 |
4206 b1 | b1 - 1 |
4207 b2 | b2 - 1 |
4208 b3 | b3 - 1;
4209 if (res >= 128) break;
4210 i += 4;
4211 }
4212 for(; i < length; i++) {
4213 unsigned short c;
4214 // no embedded zeros
4215 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4216 if(buffer[i] < 128) {
4217 continue;
4218 }
4219 if ((i + 5) < length) { // see if it's legal supplementary character
4220 if (UTF8::is_supplementary_character(&buffer[i])) {
4221 c = UTF8::get_supplementary_character(&buffer[i]);
4222 i += 5;
4223 continue;
4224 }
4225 }
4226 switch (buffer[i] >> 4) {
4227 default: break;
4228 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4229 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4230 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4231 c = (buffer[i] & 0x1F) << 6;
4232 i++;
4233 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4234 c += buffer[i] & 0x3F;
4235 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4236 // for classes with major > 47, c must a null or a character in its shortest form
4237 break;
4238 }
4239 }
4240 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4241 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4242 c = (buffer[i] & 0xF) << 12;
4243 i += 2;
4244 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4245 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4246 if (_major_version <= 47 || c >= 0x800) {
4247 // for classes with major > 47, c must be in its shortest form
4248 break;
4249 }
4250 }
4251 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4252 } // end of switch
4253 } // end of for
4254 }
4255
4256 // Checks if name is a legal class name.
4257 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4258 if (!_need_verify || _relax_verify) { return; }
4259
4260 char buf[fixed_buffer_size];
4261 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4262 unsigned int length = name->utf8_length();
4263 bool legal = false;
4264
4265 if (length > 0) {
4266 char* p;
4267 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4268 p = skip_over_field_signature(bytes, false, length, CHECK);
4269 legal = (p != NULL) && ((p - bytes) == (int)length);
4270 } else if (_major_version < JAVA_1_5_VERSION) {
4271 if (bytes[0] != '<') {
4272 p = skip_over_field_name(bytes, true, length);
4273 legal = (p != NULL) && ((p - bytes) == (int)length);
4274 }
4275 } else {
4276 // 4900761: relax the constraints based on JSR202 spec
4277 // Class names may be drawn from the entire Unicode character set.
4278 // Identifiers between '/' must be unqualified names.
4279 // The utf8 string has been verified when parsing cpool entries.
4280 legal = verify_unqualified_name(bytes, length, LegalClass);
4281 }
4282 }
4283 if (!legal) {
4284 ResourceMark rm(THREAD);
4285 Exceptions::fthrow(
4286 THREAD_AND_LOCATION,
4287 vmSymbols::java_lang_ClassFormatError(),
4288 "Illegal class name \"%s\" in class file %s", bytes,
4289 _class_name->as_C_string()
4290 );
4291 return;
4292 }
4293 }
4294
4295 // Checks if name is a legal field name.
4296 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4297 if (!_need_verify || _relax_verify) { return; }
4298
4299 char buf[fixed_buffer_size];
4300 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4301 unsigned int length = name->utf8_length();
4302 bool legal = false;
4303
4304 if (length > 0) {
4305 if (_major_version < JAVA_1_5_VERSION) {
4306 if (bytes[0] != '<') {
4307 char* p = skip_over_field_name(bytes, false, length);
4308 legal = (p != NULL) && ((p - bytes) == (int)length);
4309 }
4310 } else {
4311 // 4881221: relax the constraints based on JSR202 spec
4312 legal = verify_unqualified_name(bytes, length, LegalField);
4313 }
4314 }
4315
4316 if (!legal) {
4317 ResourceMark rm(THREAD);
4318 Exceptions::fthrow(
4319 THREAD_AND_LOCATION,
4320 vmSymbols::java_lang_ClassFormatError(),
4321 "Illegal field name \"%s\" in class %s", bytes,
4322 _class_name->as_C_string()
4323 );
4324 return;
4325 }
4326 }
4327
4328 // Checks if name is a legal method name.
4329 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4330 if (!_need_verify || _relax_verify) { return; }
4331
4332 assert(name != NULL, "method name is null");
4333 char buf[fixed_buffer_size];
4334 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4335 unsigned int length = name->utf8_length();
4336 bool legal = false;
4337
4338 if (length > 0) {
4339 if (bytes[0] == '<') {
4340 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4341 legal = true;
4342 }
4343 } else if (_major_version < JAVA_1_5_VERSION) {
4344 char* p;
4345 p = skip_over_field_name(bytes, false, length);
4346 legal = (p != NULL) && ((p - bytes) == (int)length);
4347 } else {
4348 // 4881221: relax the constraints based on JSR202 spec
4349 legal = verify_unqualified_name(bytes, length, LegalMethod);
4350 }
4351 }
4352
4353 if (!legal) {
4354 ResourceMark rm(THREAD);
4355 Exceptions::fthrow(
4356 THREAD_AND_LOCATION,
4357 vmSymbols::java_lang_ClassFormatError(),
4358 "Illegal method name \"%s\" in class %s", bytes,
4359 _class_name->as_C_string()
4360 );
4361 return;
4362 }
4363 }
4364
4365
4366 // Checks if signature is a legal field signature.
4367 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4368 if (!_need_verify) { return; }
4369
4370 char buf[fixed_buffer_size];
4371 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4372 unsigned int length = signature->utf8_length();
4373 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4374
4375 if (p == NULL || (p - bytes) != (int)length) {
4376 throwIllegalSignature("Field", name, signature, CHECK);
4377 }
4378 }
4379
4380 // Checks if signature is a legal method signature.
4381 // Returns number of parameters
4382 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4383 if (!_need_verify) {
4384 // make sure caller's args_size will be less than 0 even for non-static
4385 // method so it will be recomputed in compute_size_of_parameters().
4386 return -2;
4387 }
4388
4389 unsigned int args_size = 0;
4390 char buf[fixed_buffer_size];
4391 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4392 unsigned int length = signature->utf8_length();
4393 char* nextp;
4394
4395 // The first character must be a '('
4396 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4397 length--;
4398 // Skip over legal field signatures
4399 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4400 while ((length > 0) && (nextp != NULL)) {
4401 args_size++;
4402 if (p[0] == 'J' || p[0] == 'D') {
4403 args_size++;
4404 }
4405 length -= nextp - p;
4406 p = nextp;
4407 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4408 }
4409 // The first non-signature thing better be a ')'
4410 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4411 length--;
4412 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4413 // All internal methods must return void
4414 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4415 return args_size;
4416 }
4417 } else {
4418 // Now we better just have a return value
4419 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4420 if (nextp && ((int)length == (nextp - p))) {
4421 return args_size;
4422 }
4423 }
4424 }
4425 }
4426 // Report error
4427 throwIllegalSignature("Method", name, signature, CHECK_0);
4428 return 0;
4429 }
4430
4431
4432 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4433 // Method names also may not contain the characters '<' or '>', unless <init>
4434 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4435 // method. Because these names have been checked as special cases before
4436 // calling this method in verify_legal_method_name.
4437 bool ClassFileParser::verify_unqualified_name(
4438 char* name, unsigned int length, int type) {
4439 jchar ch;
4440
4441 for (char* p = name; p != name + length; ) {
4442 ch = *p;
4443 if (ch < 128) {
4444 p++;
4445 if (ch == '.' || ch == ';' || ch == '[' ) {
4446 return false; // do not permit '.', ';', or '['
4447 }
4448 if (type != LegalClass && ch == '/') {
4449 return false; // do not permit '/' unless it's class name
4450 }
4451 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4452 return false; // do not permit '<' or '>' in method names
4453 }
4454 } else {
4455 char* tmp_p = UTF8::next(p, &ch);
4456 p = tmp_p;
4457 }
4458 }
4459 return true;
4460 }
4461
4462
4463 // Take pointer to a string. Skip over the longest part of the string that could
4464 // be taken as a fieldname. Allow '/' if slash_ok is true.
4465 // Return a pointer to just past the fieldname.
4466 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4467 // being true, we saw consecutive slashes (meaning we were looking for a
4468 // qualified path but found something that was badly-formed).
4469 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4470 char* p;
4471 jchar ch;
4472 jboolean last_is_slash = false;
4473 jboolean not_first_ch = false;
4474
4475 for (p = name; p != name + length; not_first_ch = true) {
4476 char* old_p = p;
4477 ch = *p;
4478 if (ch < 128) {
4479 p++;
4480 // quick check for ascii
4481 if ((ch >= 'a' && ch <= 'z') ||
4482 (ch >= 'A' && ch <= 'Z') ||
4483 (ch == '_' || ch == '$') ||
4484 (not_first_ch && ch >= '0' && ch <= '9')) {
4485 last_is_slash = false;
4486 continue;
4487 }
4488 if (slash_ok && ch == '/') {
4489 if (last_is_slash) {
4490 return NULL; // Don't permit consecutive slashes
4491 }
4492 last_is_slash = true;
4493 continue;
4494 }
4495 } else {
4496 jint unicode_ch;
4497 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4498 p = tmp_p;
4499 last_is_slash = false;
4500 // Check if ch is Java identifier start or is Java identifier part
4501 // 4672820: call java.lang.Character methods directly without generating separate tables.
4502 EXCEPTION_MARK;
4503 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4504
4505 // return value
4506 JavaValue result(T_BOOLEAN);
4507 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4508 JavaCallArguments args;
4509 args.push_int(unicode_ch);
4510
4511 // public static boolean isJavaIdentifierStart(char ch);
4512 JavaCalls::call_static(&result,
4513 klass,
4514 vmSymbols::isJavaIdentifierStart_name(),
4515 vmSymbols::int_bool_signature(),
4516 &args,
4517 THREAD);
4518
4519 if (HAS_PENDING_EXCEPTION) {
4520 CLEAR_PENDING_EXCEPTION;
4521 return 0;
4522 }
4523 if (result.get_jboolean()) {
4524 continue;
4525 }
4526
4527 if (not_first_ch) {
4528 // public static boolean isJavaIdentifierPart(char ch);
4529 JavaCalls::call_static(&result,
4530 klass,
4531 vmSymbols::isJavaIdentifierPart_name(),
4532 vmSymbols::int_bool_signature(),
4533 &args,
4534 THREAD);
4535
4536 if (HAS_PENDING_EXCEPTION) {
4537 CLEAR_PENDING_EXCEPTION;
4538 return 0;
4539 }
4540
4541 if (result.get_jboolean()) {
4542 continue;
4543 }
4544 }
4545 }
4546 return (not_first_ch) ? old_p : NULL;
4547 }
4548 return (not_first_ch) ? p : NULL;
4549 }
4550
4551
4552 // Take pointer to a string. Skip over the longest part of the string that could
4553 // be taken as a field signature. Allow "void" if void_ok.
4554 // Return a pointer to just past the signature.
4555 // Return NULL if no legal signature is found.
4556 char* ClassFileParser::skip_over_field_signature(char* signature,
4557 bool void_ok,
4558 unsigned int length,
4559 TRAPS) {
4560 unsigned int array_dim = 0;
4561 while (length > 0) {
4562 switch (signature[0]) {
4563 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4564 case JVM_SIGNATURE_BOOLEAN:
4565 case JVM_SIGNATURE_BYTE:
4566 case JVM_SIGNATURE_CHAR:
4567 case JVM_SIGNATURE_SHORT:
4568 case JVM_SIGNATURE_INT:
4569 case JVM_SIGNATURE_FLOAT:
4570 case JVM_SIGNATURE_LONG:
4571 case JVM_SIGNATURE_DOUBLE:
4572 return signature + 1;
4573 case JVM_SIGNATURE_CLASS: {
4574 if (_major_version < JAVA_1_5_VERSION) {
4575 // Skip over the class name if one is there
4576 char* p = skip_over_field_name(signature + 1, true, --length);
4577
4578 // The next character better be a semicolon
4579 if (p && (p - signature) > 1 && p[0] == ';') {
4580 return p + 1;
4581 }
4582 } else {
4583 // 4900761: For class version > 48, any unicode is allowed in class name.
4584 length--;
4585 signature++;
4586 while (length > 0 && signature[0] != ';') {
4587 if (signature[0] == '.') {
4588 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4589 }
4590 length--;
4591 signature++;
4592 }
4593 if (signature[0] == ';') { return signature + 1; }
4594 }
4595
4596 return NULL;
4597 }
4598 case JVM_SIGNATURE_ARRAY:
4599 array_dim++;
4600 if (array_dim > 255) {
4601 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4602 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4603 }
4604 // The rest of what's there better be a legal signature
4605 signature++;
4606 length--;
4607 void_ok = false;
4608 break;
4609
4610 default:
4611 return NULL;
4612 }
4613 }
4614 return NULL;
4615 }