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/fieldStreams.hpp"
40 #include "oops/instanceKlass.hpp"
41 #include "oops/instanceMirrorKlass.hpp"
42 #include "oops/klass.inline.hpp"
43 #include "oops/klassOop.hpp"
44 #include "oops/klassVtable.hpp"
45 #include "oops/methodOop.hpp"
46 #include "oops/symbol.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "prims/jvmtiThreadState.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/perfData.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/timer.hpp"
54 #include "services/classLoadingService.hpp"
55 #include "services/threadService.hpp"
56
57 // We generally try to create the oops directly when parsing, rather than
58 // allocating temporary data structures and copying the bytes twice. A
59 // temporary area is only needed when parsing utf8 entries in the constant
60 // pool and when parsing line number tables.
61
62 // We add assert in debug mode when class format is not checked.
63
64 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
65 #define JAVA_MIN_SUPPORTED_VERSION 45
66 #define JAVA_MAX_SUPPORTED_VERSION 51
67 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
68
69 // Used for two backward compatibility reasons:
70 // - to check for new additions to the class file format in JDK1.5
71 // - to check for bug fixes in the format checker in JDK1.5
72 #define JAVA_1_5_VERSION 49
73
74 // Used for backward compatibility reasons:
75 // - to check for javac bug fixes that happened after 1.5
76 // - also used as the max version when running in jdk6
77 #define JAVA_6_VERSION 50
78
79 // Used for backward compatibility reasons:
80 // - to check NameAndType_info signatures more aggressively
81 #define JAVA_7_VERSION 51
82
83
84 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
85 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
86 // this function (_current can be allocated in a register, with scalar
87 // replacement of aggregates). The _current pointer is copied back to
88 // stream() when this function returns. DON'T call another method within
89 // this method that uses stream().
90 ClassFileStream* cfs0 = stream();
91 ClassFileStream cfs1 = *cfs0;
92 ClassFileStream* cfs = &cfs1;
93 #ifdef ASSERT
94 assert(cfs->allocated_on_stack(),"should be local");
95 u1* old_current = cfs0->current();
96 #endif
97
98 // Used for batching symbol allocations.
99 const char* names[SymbolTable::symbol_alloc_batch_size];
100 int lengths[SymbolTable::symbol_alloc_batch_size];
101 int indices[SymbolTable::symbol_alloc_batch_size];
102 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
103 int names_count = 0;
104
105 // parsing Index 0 is unused
106 for (int index = 1; index < length; index++) {
107 // Each of the following case guarantees one more byte in the stream
108 // for the following tag or the access_flags following constant pool,
109 // so we don't need bounds-check for reading tag.
110 u1 tag = cfs->get_u1_fast();
111 switch (tag) {
112 case JVM_CONSTANT_Class :
113 {
114 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
115 u2 name_index = cfs->get_u2_fast();
116 cp->klass_index_at_put(index, name_index);
117 }
118 break;
119 case JVM_CONSTANT_Fieldref :
120 {
121 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
122 u2 class_index = cfs->get_u2_fast();
123 u2 name_and_type_index = cfs->get_u2_fast();
124 cp->field_at_put(index, class_index, name_and_type_index);
125 }
126 break;
127 case JVM_CONSTANT_Methodref :
128 {
129 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
130 u2 class_index = cfs->get_u2_fast();
131 u2 name_and_type_index = cfs->get_u2_fast();
132 cp->method_at_put(index, class_index, name_and_type_index);
133 }
134 break;
135 case JVM_CONSTANT_InterfaceMethodref :
136 {
137 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
138 u2 class_index = cfs->get_u2_fast();
139 u2 name_and_type_index = cfs->get_u2_fast();
140 cp->interface_method_at_put(index, class_index, name_and_type_index);
141 }
142 break;
143 case JVM_CONSTANT_String :
144 {
145 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
146 u2 string_index = cfs->get_u2_fast();
147 cp->string_index_at_put(index, string_index);
148 }
149 break;
150 case JVM_CONSTANT_MethodHandle :
151 case JVM_CONSTANT_MethodType :
152 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
153 classfile_parse_error(
154 "Class file version does not support constant tag %u in class file %s",
155 tag, CHECK);
156 }
157 if (!EnableInvokeDynamic) {
158 classfile_parse_error(
159 "This JVM does not support constant tag %u in class file %s",
160 tag, CHECK);
161 }
162 if (tag == JVM_CONSTANT_MethodHandle) {
163 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
164 u1 ref_kind = cfs->get_u1_fast();
165 u2 method_index = cfs->get_u2_fast();
166 cp->method_handle_index_at_put(index, ref_kind, method_index);
167 } else if (tag == JVM_CONSTANT_MethodType) {
168 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
169 u2 signature_index = cfs->get_u2_fast();
170 cp->method_type_index_at_put(index, signature_index);
171 } else {
172 ShouldNotReachHere();
173 }
174 break;
175 case JVM_CONSTANT_InvokeDynamic :
176 {
177 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
178 classfile_parse_error(
179 "Class file version does not support constant tag %u in class file %s",
180 tag, CHECK);
181 }
182 if (!EnableInvokeDynamic) {
183 classfile_parse_error(
184 "This JVM does not support constant tag %u in class file %s",
185 tag, CHECK);
186 }
187 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
188 u2 bootstrap_specifier_index = cfs->get_u2_fast();
189 u2 name_and_type_index = cfs->get_u2_fast();
190 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
191 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
192 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
193 }
194 break;
195 case JVM_CONSTANT_Integer :
196 {
197 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
198 u4 bytes = cfs->get_u4_fast();
199 cp->int_at_put(index, (jint) bytes);
200 }
201 break;
202 case JVM_CONSTANT_Float :
203 {
204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
205 u4 bytes = cfs->get_u4_fast();
206 cp->float_at_put(index, *(jfloat*)&bytes);
207 }
208 break;
209 case JVM_CONSTANT_Long :
210 // A mangled type might cause you to overrun allocated memory
211 guarantee_property(index+1 < length,
212 "Invalid constant pool entry %u in class file %s",
213 index, CHECK);
214 {
215 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
216 u8 bytes = cfs->get_u8_fast();
217 cp->long_at_put(index, bytes);
218 }
219 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
220 break;
221 case JVM_CONSTANT_Double :
222 // A mangled type might cause you to overrun allocated memory
223 guarantee_property(index+1 < length,
224 "Invalid constant pool entry %u in class file %s",
225 index, CHECK);
226 {
227 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
228 u8 bytes = cfs->get_u8_fast();
229 cp->double_at_put(index, *(jdouble*)&bytes);
230 }
231 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
232 break;
233 case JVM_CONSTANT_NameAndType :
234 {
235 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
236 u2 name_index = cfs->get_u2_fast();
237 u2 signature_index = cfs->get_u2_fast();
238 cp->name_and_type_at_put(index, name_index, signature_index);
239 }
240 break;
241 case JVM_CONSTANT_Utf8 :
242 {
243 cfs->guarantee_more(2, CHECK); // utf8_length
244 u2 utf8_length = cfs->get_u2_fast();
245 u1* utf8_buffer = cfs->get_u1_buffer();
246 assert(utf8_buffer != NULL, "null utf8 buffer");
247 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
248 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
249 cfs->skip_u1_fast(utf8_length);
250
251 // Before storing the symbol, make sure it's legal
252 if (_need_verify) {
253 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
254 }
255
256 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
257 Handle patch = clear_cp_patch_at(index);
258 guarantee_property(java_lang_String::is_instance(patch()),
259 "Illegal utf8 patch at %d in class file %s",
260 index, CHECK);
261 char* str = java_lang_String::as_utf8_string(patch());
262 // (could use java_lang_String::as_symbol instead, but might as well batch them)
263 utf8_buffer = (u1*) str;
264 utf8_length = (int) strlen(str);
265 }
266
267 unsigned int hash;
268 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
269 if (result == NULL) {
270 names[names_count] = (char*)utf8_buffer;
271 lengths[names_count] = utf8_length;
272 indices[names_count] = index;
273 hashValues[names_count++] = hash;
274 if (names_count == SymbolTable::symbol_alloc_batch_size) {
275 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
276 names_count = 0;
277 }
278 } else {
279 cp->symbol_at_put(index, result);
280 }
281 }
282 break;
283 default:
284 classfile_parse_error(
285 "Unknown constant tag %u in class file %s", tag, CHECK);
286 break;
287 }
288 }
289
290 // Allocate the remaining symbols
291 if (names_count > 0) {
292 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
293 }
294
295 // Copy _current pointer of local copy back to stream().
296 #ifdef ASSERT
297 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
298 #endif
299 cfs0->set_current(cfs1.current());
300 }
301
302 // This class unreferences constant pool symbols if an error has occurred
303 // while parsing the class before it is assigned into the class.
304 // If it gets an error after that it is unloaded and the constant pool will
305 // be cleaned up then.
306 class ConstantPoolCleaner : public StackObj {
307 constantPoolHandle _cphandle;
308 bool _in_error;
309 public:
310 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
311 ~ConstantPoolCleaner() {
312 if (_in_error && _cphandle.not_null()) {
313 _cphandle->unreference_symbols();
314 }
315 }
316 void set_in_error(bool clean) { _in_error = clean; }
317 };
318
319 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
320
321 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
324
325 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
326 u2 length = cfs->get_u2_fast();
327 guarantee_property(
328 length >= 1, "Illegal constant pool size %u in class file %s",
329 length, CHECK_(nullHandle));
330 constantPoolOop constant_pool =
331 oopFactory::new_constantPool(length,
332 oopDesc::IsSafeConc,
333 CHECK_(nullHandle));
334 constantPoolHandle cp (THREAD, constant_pool);
335
336 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
337 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
338
339 // parsing constant pool entries
340 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
341
342 int index = 1; // declared outside of loops for portability
343
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_cp_range(klass_ref_index, length) &&
360 is_klass_reference(cp, klass_ref_index),
361 "Invalid constant pool index %u in class file %s",
362 klass_ref_index,
363 CHECK_(nullHandle));
364 check_property(valid_cp_range(name_and_type_ref_index, length) &&
365 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
366 "Invalid constant pool index %u in class file %s",
367 name_and_type_ref_index,
368 CHECK_(nullHandle));
369 break;
370 }
371 case JVM_CONSTANT_String :
372 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
373 break;
374 case JVM_CONSTANT_Integer :
375 break;
376 case JVM_CONSTANT_Float :
377 break;
378 case JVM_CONSTANT_Long :
379 case JVM_CONSTANT_Double :
380 index++;
381 check_property(
382 (index < length && cp->tag_at(index).is_invalid()),
383 "Improper constant pool long/double index %u in class file %s",
384 index, CHECK_(nullHandle));
385 break;
386 case JVM_CONSTANT_NameAndType : {
387 if (!_need_verify) break;
388 int name_ref_index = cp->name_ref_index_at(index);
389 int signature_ref_index = cp->signature_ref_index_at(index);
390 check_property(
391 valid_cp_range(name_ref_index, length) &&
392 cp->tag_at(name_ref_index).is_utf8(),
393 "Invalid constant pool index %u in class file %s",
394 name_ref_index, CHECK_(nullHandle));
395 check_property(
396 valid_cp_range(signature_ref_index, length) &&
397 cp->tag_at(signature_ref_index).is_utf8(),
398 "Invalid constant pool index %u in class file %s",
399 signature_ref_index, CHECK_(nullHandle));
400 break;
401 }
402 case JVM_CONSTANT_Utf8 :
403 break;
404 case JVM_CONSTANT_UnresolvedClass : // fall-through
405 case JVM_CONSTANT_UnresolvedClassInError:
406 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
407 break;
408 case JVM_CONSTANT_ClassIndex :
409 {
410 int class_index = cp->klass_index_at(index);
411 check_property(
412 valid_cp_range(class_index, length) &&
413 cp->tag_at(class_index).is_utf8(),
414 "Invalid constant pool index %u in class file %s",
415 class_index, CHECK_(nullHandle));
416 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
417 }
418 break;
419 case JVM_CONSTANT_UnresolvedString :
420 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
421 break;
422 case JVM_CONSTANT_StringIndex :
423 {
424 int string_index = cp->string_index_at(index);
425 check_property(
426 valid_cp_range(string_index, length) &&
427 cp->tag_at(string_index).is_utf8(),
428 "Invalid constant pool index %u in class file %s",
429 string_index, CHECK_(nullHandle));
430 Symbol* sym = cp->symbol_at(string_index);
431 cp->unresolved_string_at_put(index, sym);
432 }
433 break;
434 case JVM_CONSTANT_MethodHandle :
435 {
436 int ref_index = cp->method_handle_index_at(index);
437 check_property(
438 valid_cp_range(ref_index, length) &&
439 EnableInvokeDynamic,
440 "Invalid constant pool index %u in class file %s",
441 ref_index, CHECK_(nullHandle));
442 constantTag tag = cp->tag_at(ref_index);
443 int ref_kind = cp->method_handle_ref_kind_at(index);
444 switch (ref_kind) {
445 case JVM_REF_getField:
446 case JVM_REF_getStatic:
447 case JVM_REF_putField:
448 case JVM_REF_putStatic:
449 check_property(
450 tag.is_field(),
451 "Invalid constant pool index %u in class file %s (not a field)",
452 ref_index, CHECK_(nullHandle));
453 break;
454 case JVM_REF_invokeVirtual:
455 case JVM_REF_invokeStatic:
456 case JVM_REF_invokeSpecial:
457 case JVM_REF_newInvokeSpecial:
458 check_property(
459 tag.is_method(),
460 "Invalid constant pool index %u in class file %s (not a method)",
461 ref_index, CHECK_(nullHandle));
462 break;
463 case JVM_REF_invokeInterface:
464 check_property(
465 tag.is_interface_method(),
466 "Invalid constant pool index %u in class file %s (not an interface method)",
467 ref_index, CHECK_(nullHandle));
468 break;
469 default:
470 classfile_parse_error(
471 "Bad method handle kind at constant pool index %u in class file %s",
472 index, CHECK_(nullHandle));
473 }
474 // Keep the ref_index unchanged. It will be indirected at link-time.
475 }
476 break;
477 case JVM_CONSTANT_MethodType :
478 {
479 int ref_index = cp->method_type_index_at(index);
480 check_property(
481 valid_cp_range(ref_index, length) &&
482 cp->tag_at(ref_index).is_utf8() &&
483 EnableInvokeDynamic,
484 "Invalid constant pool index %u in class file %s",
485 ref_index, CHECK_(nullHandle));
486 }
487 break;
488 case JVM_CONSTANT_InvokeDynamic :
489 {
490 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
491 check_property(valid_cp_range(name_and_type_ref_index, length) &&
492 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
493 "Invalid constant pool index %u in class file %s",
494 name_and_type_ref_index,
495 CHECK_(nullHandle));
496 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
497 break;
498 }
499 default:
500 fatal(err_msg("bad constant pool tag value %u",
501 cp->tag_at(index).value()));
502 ShouldNotReachHere();
503 break;
504 } // end of switch
505 } // end of for
506
507 if (_cp_patches != NULL) {
508 // need to treat this_class specially...
509 assert(EnableInvokeDynamic, "");
510 int this_class_index;
511 {
512 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
513 u1* mark = cfs->current();
514 u2 flags = cfs->get_u2_fast();
515 this_class_index = cfs->get_u2_fast();
516 cfs->set_current(mark); // revert to mark
517 }
518
519 for (index = 1; index < length; index++) { // Index 0 is unused
520 if (has_cp_patch_at(index)) {
521 guarantee_property(index != this_class_index,
522 "Illegal constant pool patch to self at %d in class file %s",
523 index, CHECK_(nullHandle));
524 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
525 }
526 }
527 // Ensure that all the patches have been used.
528 for (index = 0; index < _cp_patches->length(); index++) {
529 guarantee_property(!has_cp_patch_at(index),
530 "Unused constant pool patch at %d in class file %s",
531 index, CHECK_(nullHandle));
532 }
533 }
534
535 if (!_need_verify) {
536 cp_in_error.set_in_error(false);
537 return cp;
538 }
539
540 // second verification pass - checks the strings are of the right format.
541 // but not yet to the other entries
542 for (index = 1; index < length; index++) {
543 jbyte tag = cp->tag_at(index).value();
544 switch (tag) {
545 case JVM_CONSTANT_UnresolvedClass: {
546 Symbol* class_name = cp->unresolved_klass_at(index);
547 // check the name, even if _cp_patches will overwrite it
548 verify_legal_class_name(class_name, CHECK_(nullHandle));
549 break;
550 }
551 case JVM_CONSTANT_NameAndType: {
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 int sig_index = cp->signature_ref_index_at(index);
554 int name_index = cp->name_ref_index_at(index);
555 Symbol* name = cp->symbol_at(name_index);
556 Symbol* sig = cp->symbol_at(sig_index);
557 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
558 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
559 } else {
560 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
561 }
562 }
563 break;
564 }
565 case JVM_CONSTANT_InvokeDynamic:
566 case JVM_CONSTANT_Fieldref:
567 case JVM_CONSTANT_Methodref:
568 case JVM_CONSTANT_InterfaceMethodref: {
569 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
570 // already verified to be utf8
571 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
572 // already verified to be utf8
573 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
574 Symbol* name = cp->symbol_at(name_ref_index);
575 Symbol* signature = cp->symbol_at(signature_ref_index);
576 if (tag == JVM_CONSTANT_Fieldref) {
577 verify_legal_field_name(name, CHECK_(nullHandle));
578 if (_need_verify && _major_version >= JAVA_7_VERSION) {
579 // Signature is verified above, when iterating NameAndType_info.
580 // Need only to be sure it's the right type.
581 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
582 throwIllegalSignature(
583 "Field", name, signature, CHECK_(nullHandle));
584 }
585 } else {
586 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
587 }
588 } else {
589 verify_legal_method_name(name, CHECK_(nullHandle));
590 if (_need_verify && _major_version >= JAVA_7_VERSION) {
591 // Signature is verified above, when iterating NameAndType_info.
592 // Need only to be sure it's the right type.
593 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
594 throwIllegalSignature(
595 "Method", name, signature, CHECK_(nullHandle));
596 }
597 } else {
598 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
599 }
600 if (tag == JVM_CONSTANT_Methodref) {
601 // 4509014: If a class method name begins with '<', it must be "<init>".
602 assert(name != NULL, "method name in constant pool is null");
603 unsigned int name_len = name->utf8_length();
604 assert(name_len > 0, "bad method name"); // already verified as legal name
605 if (name->byte_at(0) == '<') {
606 if (name != vmSymbols::object_initializer_name()) {
607 classfile_parse_error(
608 "Bad method name at constant pool index %u in class file %s",
609 name_ref_index, CHECK_(nullHandle));
610 }
611 }
612 }
613 }
614 break;
615 }
616 case JVM_CONSTANT_MethodHandle: {
617 int ref_index = cp->method_handle_index_at(index);
618 int ref_kind = cp->method_handle_ref_kind_at(index);
619 switch (ref_kind) {
620 case JVM_REF_invokeVirtual:
621 case JVM_REF_invokeStatic:
622 case JVM_REF_invokeSpecial:
623 case JVM_REF_newInvokeSpecial:
624 {
625 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
626 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
627 Symbol* name = cp->symbol_at(name_ref_index);
628 if (ref_kind == JVM_REF_newInvokeSpecial) {
629 if (name != vmSymbols::object_initializer_name()) {
630 classfile_parse_error(
631 "Bad constructor name at constant pool index %u in class file %s",
632 name_ref_index, CHECK_(nullHandle));
633 }
634 } else {
635 if (name == vmSymbols::object_initializer_name()) {
636 classfile_parse_error(
637 "Bad method name at constant pool index %u in class file %s",
638 name_ref_index, CHECK_(nullHandle));
639 }
640 }
641 }
642 break;
643 // Other ref_kinds are already fully checked in previous pass.
644 }
645 break;
646 }
647 case JVM_CONSTANT_MethodType: {
648 Symbol* no_name = vmSymbols::type_name(); // place holder
649 Symbol* signature = cp->method_type_signature_at(index);
650 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
651 break;
652 }
653 case JVM_CONSTANT_Utf8: {
654 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
655 }
656 } // end of switch
657 } // end of for
658
659 cp_in_error.set_in_error(false);
660 return cp;
661 }
662
663
664 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
665 assert(EnableInvokeDynamic, "");
666 BasicType patch_type = T_VOID;
667 switch (cp->tag_at(index).value()) {
668
669 case JVM_CONSTANT_UnresolvedClass :
670 // Patching a class means pre-resolving it.
671 // The name in the constant pool is ignored.
672 if (java_lang_Class::is_instance(patch())) {
673 guarantee_property(!java_lang_Class::is_primitive(patch()),
674 "Illegal class patch at %d in class file %s",
675 index, CHECK);
676 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
677 } else {
678 guarantee_property(java_lang_String::is_instance(patch()),
679 "Illegal class patch at %d in class file %s",
680 index, CHECK);
681 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
682 cp->unresolved_klass_at_put(index, name);
683 }
684 break;
685
686 case JVM_CONSTANT_UnresolvedString :
687 // Patching a string means pre-resolving it.
688 // The spelling in the constant pool is ignored.
689 // The constant reference may be any object whatever.
690 // If it is not a real interned string, the constant is referred
691 // to as a "pseudo-string", and must be presented to the CP
692 // explicitly, because it may require scavenging.
693 cp->pseudo_string_at_put(index, patch());
694 break;
695
696 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
697 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
698 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
699 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
700 patch_prim:
701 {
702 jvalue value;
703 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
704 guarantee_property(value_type == patch_type,
705 "Illegal primitive patch at %d in class file %s",
706 index, CHECK);
707 switch (value_type) {
708 case T_INT: cp->int_at_put(index, value.i); break;
709 case T_FLOAT: cp->float_at_put(index, value.f); break;
710 case T_LONG: cp->long_at_put(index, value.j); break;
711 case T_DOUBLE: cp->double_at_put(index, value.d); break;
712 default: assert(false, "");
713 }
714 }
715 break;
716
717 default:
718 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
719 guarantee_property(!has_cp_patch_at(index),
720 "Illegal unexpected patch at %d in class file %s",
721 index, CHECK);
722 return;
723 }
724
725 // On fall-through, mark the patch as used.
726 clear_cp_patch_at(index);
727 }
728
729
730
731 class NameSigHash: public ResourceObj {
732 public:
733 Symbol* _name; // name
734 Symbol* _sig; // signature
735 NameSigHash* _next; // Next entry in hash table
736 };
737
738
739 #define HASH_ROW_SIZE 256
740
741 unsigned int hash(Symbol* name, Symbol* sig) {
742 unsigned int raw_hash = 0;
743 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
744 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
745
746 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
747 }
748
749
750 void initialize_hashtable(NameSigHash** table) {
751 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
752 }
753
754 // Return false if the name/sig combination is found in table.
755 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
756 // The old format checker uses heap sort to find duplicates.
757 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
758 // of table since we don't expect Symbol*'s to move.
759 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
760 assert(name != NULL, "name in constant pool is NULL");
761
762 // First lookup for duplicates
763 int index = hash(name, sig);
764 NameSigHash* entry = table[index];
765 while (entry != NULL) {
766 if (entry->_name == name && entry->_sig == sig) {
767 return false;
768 }
769 entry = entry->_next;
770 }
771
772 // No duplicate is found, allocate a new entry and fill it.
773 entry = new NameSigHash();
774 entry->_name = name;
775 entry->_sig = sig;
776
777 // Insert into hash table
778 entry->_next = table[index];
779 table[index] = entry;
780
781 return true;
782 }
783
784
785 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
786 int length,
787 Handle class_loader,
788 Handle protection_domain,
789 Symbol* class_name,
790 TRAPS) {
791 ClassFileStream* cfs = stream();
792 assert(length > 0, "only called for length>0");
793 objArrayHandle nullHandle;
794 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
795 objArrayHandle interfaces (THREAD, interface_oop);
796
797 int index;
798 for (index = 0; index < length; index++) {
799 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
800 KlassHandle interf;
801 check_property(
802 valid_cp_range(interface_index, cp->length()) &&
803 is_klass_reference(cp, interface_index),
804 "Interface name has bad constant pool index %u in class file %s",
805 interface_index, CHECK_(nullHandle));
806 if (cp->tag_at(interface_index).is_klass()) {
807 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
808 } else {
809 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
810
811 // Don't need to check legal name because it's checked when parsing constant pool.
812 // But need to make sure it's not an array type.
813 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
814 "Bad interface name in class file %s", CHECK_(nullHandle));
815
816 // Call resolve_super so classcircularity is checked
817 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
818 unresolved_klass, class_loader, protection_domain,
819 false, CHECK_(nullHandle));
820 interf = KlassHandle(THREAD, k);
821
822 if (LinkWellKnownClasses) // my super type is well known to me
823 cp->klass_at_put(interface_index, interf()); // eagerly resolve
824 }
825
826 if (!Klass::cast(interf())->is_interface()) {
827 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
828 }
829 interfaces->obj_at_put(index, interf());
830 }
831
832 if (!_need_verify || length <= 1) {
833 return interfaces;
834 }
835
836 // Check if there's any duplicates in interfaces
837 ResourceMark rm(THREAD);
838 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
839 THREAD, NameSigHash*, HASH_ROW_SIZE);
840 initialize_hashtable(interface_names);
841 bool dup = false;
842 {
843 debug_only(No_Safepoint_Verifier nsv;)
844 for (index = 0; index < length; index++) {
845 klassOop k = (klassOop)interfaces->obj_at(index);
846 Symbol* name = instanceKlass::cast(k)->name();
847 // If no duplicates, add (name, NULL) in hashtable interface_names.
848 if (!put_after_lookup(name, NULL, interface_names)) {
849 dup = true;
850 break;
851 }
852 }
853 }
854 if (dup) {
855 classfile_parse_error("Duplicate interface name in class file %s",
856 CHECK_(nullHandle));
857 }
858
859 return interfaces;
860 }
861
862
863 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
864 // Make sure the constant pool entry is of a type appropriate to this field
865 guarantee_property(
866 (constantvalue_index > 0 &&
867 constantvalue_index < cp->length()),
868 "Bad initial value index %u in ConstantValue attribute in class file %s",
869 constantvalue_index, CHECK);
870 constantTag value_type = cp->tag_at(constantvalue_index);
871 switch ( cp->basic_type_for_signature_at(signature_index) ) {
872 case T_LONG:
873 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
874 break;
875 case T_FLOAT:
876 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
877 break;
878 case T_DOUBLE:
879 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
880 break;
881 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
882 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
883 break;
884 case T_OBJECT:
885 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
886 && (value_type.is_string() || value_type.is_unresolved_string())),
887 "Bad string initial value in class file %s", CHECK);
888 break;
889 default:
890 classfile_parse_error(
891 "Unable to set initial value %u in class file %s",
892 constantvalue_index, CHECK);
893 }
894 }
895
896
897 // Parse attributes for a field.
898 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
899 u2 attributes_count,
900 bool is_static, u2 signature_index,
901 u2* constantvalue_index_addr,
902 bool* is_synthetic_addr,
903 u2* generic_signature_index_addr,
904 typeArrayHandle* field_annotations,
905 TRAPS) {
906 ClassFileStream* cfs = stream();
907 assert(attributes_count > 0, "length should be greater than 0");
908 u2 constantvalue_index = 0;
909 u2 generic_signature_index = 0;
910 bool is_synthetic = false;
911 u1* runtime_visible_annotations = NULL;
912 int runtime_visible_annotations_length = 0;
913 u1* runtime_invisible_annotations = NULL;
914 int runtime_invisible_annotations_length = 0;
915 while (attributes_count--) {
916 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
917 u2 attribute_name_index = cfs->get_u2_fast();
918 u4 attribute_length = cfs->get_u4_fast();
919 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
920 cp->tag_at(attribute_name_index).is_utf8(),
921 "Invalid field attribute index %u in class file %s",
922 attribute_name_index,
923 CHECK);
924 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
925 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
926 // ignore if non-static
927 if (constantvalue_index != 0) {
928 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
929 }
930 check_property(
931 attribute_length == 2,
932 "Invalid ConstantValue field attribute length %u in class file %s",
933 attribute_length, CHECK);
934 constantvalue_index = cfs->get_u2(CHECK);
935 if (_need_verify) {
936 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
937 }
938 } else if (attribute_name == vmSymbols::tag_synthetic()) {
939 if (attribute_length != 0) {
940 classfile_parse_error(
941 "Invalid Synthetic field attribute length %u in class file %s",
942 attribute_length, CHECK);
943 }
944 is_synthetic = true;
945 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
946 if (attribute_length != 0) {
947 classfile_parse_error(
948 "Invalid Deprecated field attribute length %u in class file %s",
949 attribute_length, CHECK);
950 }
951 } else if (_major_version >= JAVA_1_5_VERSION) {
952 if (attribute_name == vmSymbols::tag_signature()) {
953 if (attribute_length != 2) {
954 classfile_parse_error(
955 "Wrong size %u for field's Signature attribute in class file %s",
956 attribute_length, CHECK);
957 }
958 generic_signature_index = cfs->get_u2(CHECK);
959 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
960 runtime_visible_annotations_length = attribute_length;
961 runtime_visible_annotations = cfs->get_u1_buffer();
962 assert(runtime_visible_annotations != NULL, "null visible annotations");
963 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
964 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
965 runtime_invisible_annotations_length = attribute_length;
966 runtime_invisible_annotations = cfs->get_u1_buffer();
967 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
968 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
969 } else {
970 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
971 }
972 } else {
973 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
974 }
975 }
976
977 *constantvalue_index_addr = constantvalue_index;
978 *is_synthetic_addr = is_synthetic;
979 *generic_signature_index_addr = generic_signature_index;
980 *field_annotations = assemble_annotations(runtime_visible_annotations,
981 runtime_visible_annotations_length,
982 runtime_invisible_annotations,
983 runtime_invisible_annotations_length,
984 CHECK);
985 return;
986 }
987
988
989 // Field allocation types. Used for computing field offsets.
990
991 enum FieldAllocationType {
992 STATIC_OOP, // Oops
993 STATIC_BYTE, // Boolean, Byte, char
994 STATIC_SHORT, // shorts
995 STATIC_WORD, // ints
996 STATIC_DOUBLE, // aligned long or double
997 NONSTATIC_OOP,
998 NONSTATIC_BYTE,
999 NONSTATIC_SHORT,
1000 NONSTATIC_WORD,
1001 NONSTATIC_DOUBLE,
1002 MAX_FIELD_ALLOCATION_TYPE,
1003 BAD_ALLOCATION_TYPE = -1
1004 };
1005
1006 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1007 BAD_ALLOCATION_TYPE, // 0
1008 BAD_ALLOCATION_TYPE, // 1
1009 BAD_ALLOCATION_TYPE, // 2
1010 BAD_ALLOCATION_TYPE, // 3
1011 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1012 NONSTATIC_SHORT, // T_CHAR = 5,
1013 NONSTATIC_WORD, // T_FLOAT = 6,
1014 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1015 NONSTATIC_BYTE, // T_BYTE = 8,
1016 NONSTATIC_SHORT, // T_SHORT = 9,
1017 NONSTATIC_WORD, // T_INT = 10,
1018 NONSTATIC_DOUBLE, // T_LONG = 11,
1019 NONSTATIC_OOP, // T_OBJECT = 12,
1020 NONSTATIC_OOP, // T_ARRAY = 13,
1021 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1022 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1023 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1024 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1025 BAD_ALLOCATION_TYPE, // 0
1026 BAD_ALLOCATION_TYPE, // 1
1027 BAD_ALLOCATION_TYPE, // 2
1028 BAD_ALLOCATION_TYPE, // 3
1029 STATIC_BYTE , // T_BOOLEAN = 4,
1030 STATIC_SHORT, // T_CHAR = 5,
1031 STATIC_WORD, // T_FLOAT = 6,
1032 STATIC_DOUBLE, // T_DOUBLE = 7,
1033 STATIC_BYTE, // T_BYTE = 8,
1034 STATIC_SHORT, // T_SHORT = 9,
1035 STATIC_WORD, // T_INT = 10,
1036 STATIC_DOUBLE, // T_LONG = 11,
1037 STATIC_OOP, // T_OBJECT = 12,
1038 STATIC_OOP, // T_ARRAY = 13,
1039 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1040 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1041 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1042 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1043 };
1044
1045 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1046 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1047 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1048 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1049 return result;
1050 }
1051
1052 class FieldAllocationCount: public ResourceObj {
1053 public:
1054 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1055
1056 FieldAllocationCount() {
1057 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1058 count[i] = 0;
1059 }
1060 }
1061
1062 FieldAllocationType update(bool is_static, BasicType type) {
1063 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1064 // Make sure there is no overflow with injected fields.
1065 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1066 count[atype]++;
1067 return atype;
1068 }
1069 };
1070
1071
1072 typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
1073 constantPoolHandle cp, bool is_interface,
1074 FieldAllocationCount *fac,
1075 objArrayHandle* fields_annotations,
1076 u2* java_fields_count_ptr, TRAPS) {
1077 ClassFileStream* cfs = stream();
1078 typeArrayHandle nullHandle;
1079 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1080 u2 length = cfs->get_u2_fast();
1081 *java_fields_count_ptr = length;
1082
1083 int num_injected = 0;
1084 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1085
1086 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1087 typeArrayOop new_fields = oopFactory::new_permanent_shortArray((length + num_injected) * FieldInfo::field_slots, CHECK_(nullHandle));
1088 typeArrayHandle fields(THREAD, new_fields);
1089
1090 typeArrayHandle field_annotations;
1091 for (int n = 0; n < length; n++) {
1092 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1093
1094 AccessFlags access_flags;
1095 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1096 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1097 access_flags.set_flags(flags);
1098
1099 u2 name_index = cfs->get_u2_fast();
1100 int cp_size = cp->length();
1101 check_property(
1102 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1103 "Invalid constant pool index %u for field name in class file %s",
1104 name_index, CHECK_(nullHandle));
1105 Symbol* name = cp->symbol_at(name_index);
1106 verify_legal_field_name(name, CHECK_(nullHandle));
1107
1108 u2 signature_index = cfs->get_u2_fast();
1109 check_property(
1110 valid_cp_range(signature_index, cp_size) &&
1111 cp->tag_at(signature_index).is_utf8(),
1112 "Invalid constant pool index %u for field signature in class file %s",
1113 signature_index, CHECK_(nullHandle));
1114 Symbol* sig = cp->symbol_at(signature_index);
1115 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1116
1117 u2 constantvalue_index = 0;
1118 bool is_synthetic = false;
1119 u2 generic_signature_index = 0;
1120 bool is_static = access_flags.is_static();
1121
1122 u2 attributes_count = cfs->get_u2_fast();
1123 if (attributes_count > 0) {
1124 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1125 &constantvalue_index, &is_synthetic,
1126 &generic_signature_index, &field_annotations,
1127 CHECK_(nullHandle));
1128 if (field_annotations.not_null()) {
1129 if (fields_annotations->is_null()) {
1130 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1131 *fields_annotations = objArrayHandle(THREAD, md);
1132 }
1133 (*fields_annotations)->obj_at_put(n, field_annotations());
1134 }
1135 if (is_synthetic) {
1136 access_flags.set_is_synthetic();
1137 }
1138 }
1139
1140 FieldInfo* field = FieldInfo::from_field_array(fields(), n);
1141 field->initialize(access_flags.as_short(),
1142 name_index,
1143 signature_index,
1144 constantvalue_index,
1145 generic_signature_index,
1146 0);
1147
1148 BasicType type = cp->basic_type_for_signature_at(signature_index);
1149
1150 // Remember how many oops we encountered and compute allocation type
1151 FieldAllocationType atype = fac->update(is_static, type);
1152
1153 // The correct offset is computed later (all oop fields will be located together)
1154 // We temporarily store the allocation type in the offset field
1155 field->set_offset(atype);
1156 }
1157
1158 if (num_injected != 0) {
1159 int index = length;
1160 for (int n = 0; n < num_injected; n++) {
1161 // Check for duplicates
1162 if (injected[n].may_be_java) {
1163 Symbol* name = injected[n].name();
1164 Symbol* signature = injected[n].signature();
1165 bool duplicate = false;
1166 for (int i = 0; i < length; i++) {
1167 FieldInfo* f = FieldInfo::from_field_array(fields(), i);
1168 if (name == cp->symbol_at(f->name_index()) &&
1169 signature == cp->symbol_at(f->signature_index())) {
1170 // Symbol is desclared in Java so skip this one
1171 duplicate = true;
1172 break;
1173 }
1174 }
1175 if (duplicate) {
1176 // These will be removed from the field array at the end
1177 continue;
1178 }
1179 }
1180
1181 // Injected field
1182 FieldInfo* field = FieldInfo::from_field_array(fields(), index);
1183 field->initialize(JVM_ACC_FIELD_INTERNAL,
1184 injected[n].name_index,
1185 injected[n].signature_index,
1186 0,
1187 0,
1188 0);
1189
1190 BasicType type = FieldType::basic_type(injected[n].signature());
1191
1192 // Remember how many oops we encountered and compute allocation type
1193 FieldAllocationType atype = fac->update(false, type);
1194
1195 // The correct offset is computed later (all oop fields will be located together)
1196 // We temporarily store the allocation type in the offset field
1197 field->set_offset(atype);
1198 index++;
1199 }
1200
1201 if (index < length + num_injected) {
1202 // sometimes injected fields already exist in the Java source so
1203 // the fields array could be too long. In that case trim the
1204 // fields array.
1205 new_fields = oopFactory::new_permanent_shortArray(index * FieldInfo::field_slots, CHECK_(nullHandle));
1206 for (int i = 0; i < index * FieldInfo::field_slots; i++) {
1207 new_fields->short_at_put(i, fields->short_at(i));
1208 }
1209 fields = new_fields;
1210 }
1211 }
1212
1213 if (_need_verify && length > 1) {
1214 // Check duplicated fields
1215 ResourceMark rm(THREAD);
1216 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1217 THREAD, NameSigHash*, HASH_ROW_SIZE);
1218 initialize_hashtable(names_and_sigs);
1219 bool dup = false;
1220 {
1221 debug_only(No_Safepoint_Verifier nsv;)
1222 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1223 Symbol* name = fs.name();
1224 Symbol* sig = fs.signature();
1225 // If no duplicates, add name/signature in hashtable names_and_sigs.
1226 if (!put_after_lookup(name, sig, names_and_sigs)) {
1227 dup = true;
1228 break;
1229 }
1230 }
1231 }
1232 if (dup) {
1233 classfile_parse_error("Duplicate field name&signature in class file %s",
1234 CHECK_(nullHandle));
1235 }
1236 }
1237
1238 return fields;
1239 }
1240
1241
1242 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1243 while (length-- > 0) {
1244 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1245 }
1246 }
1247
1248
1249 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1250 u4 exception_table_length,
1251 constantPoolHandle cp,
1252 TRAPS) {
1253 ClassFileStream* cfs = stream();
1254 typeArrayHandle nullHandle;
1255
1256 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1257 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1258 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1259
1260 int index = 0;
1261 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1262 for (unsigned int i = 0; i < exception_table_length; i++) {
1263 u2 start_pc = cfs->get_u2_fast();
1264 u2 end_pc = cfs->get_u2_fast();
1265 u2 handler_pc = cfs->get_u2_fast();
1266 u2 catch_type_index = cfs->get_u2_fast();
1267 // Will check legal target after parsing code array in verifier.
1268 if (_need_verify) {
1269 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1270 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1271 guarantee_property(handler_pc < code_length,
1272 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1273 if (catch_type_index != 0) {
1274 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1275 is_klass_reference(cp, catch_type_index),
1276 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1277 }
1278 }
1279 exception_handlers->int_at_put(index++, start_pc);
1280 exception_handlers->int_at_put(index++, end_pc);
1281 exception_handlers->int_at_put(index++, handler_pc);
1282 exception_handlers->int_at_put(index++, catch_type_index);
1283 }
1284 return exception_handlers;
1285 }
1286
1287 void ClassFileParser::parse_linenumber_table(
1288 u4 code_attribute_length, u4 code_length,
1289 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1290 ClassFileStream* cfs = stream();
1291 unsigned int num_entries = cfs->get_u2(CHECK);
1292
1293 // Each entry is a u2 start_pc, and a u2 line_number
1294 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1295
1296 // Verify line number attribute and table length
1297 check_property(
1298 code_attribute_length == sizeof(u2) + length_in_bytes,
1299 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1300
1301 cfs->guarantee_more(length_in_bytes, CHECK);
1302
1303 if ((*write_stream) == NULL) {
1304 if (length_in_bytes > fixed_buffer_size) {
1305 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1306 } else {
1307 (*write_stream) = new CompressedLineNumberWriteStream(
1308 linenumbertable_buffer, fixed_buffer_size);
1309 }
1310 }
1311
1312 while (num_entries-- > 0) {
1313 u2 bci = cfs->get_u2_fast(); // start_pc
1314 u2 line = cfs->get_u2_fast(); // line_number
1315 guarantee_property(bci < code_length,
1316 "Invalid pc in LineNumberTable in class file %s", CHECK);
1317 (*write_stream)->write_pair(bci, line);
1318 }
1319 }
1320
1321
1322 // Class file LocalVariableTable elements.
1323 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1324 public:
1325 u2 start_bci;
1326 u2 length;
1327 u2 name_cp_index;
1328 u2 descriptor_cp_index;
1329 u2 slot;
1330 };
1331
1332
1333 class LVT_Hash: public CHeapObj {
1334 public:
1335 LocalVariableTableElement *_elem; // element
1336 LVT_Hash* _next; // Next entry in hash table
1337 };
1338
1339 unsigned int hash(LocalVariableTableElement *elem) {
1340 unsigned int raw_hash = elem->start_bci;
1341
1342 raw_hash = elem->length + raw_hash * 37;
1343 raw_hash = elem->name_cp_index + raw_hash * 37;
1344 raw_hash = elem->slot + raw_hash * 37;
1345
1346 return raw_hash % HASH_ROW_SIZE;
1347 }
1348
1349 void initialize_hashtable(LVT_Hash** table) {
1350 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1351 table[i] = NULL;
1352 }
1353 }
1354
1355 void clear_hashtable(LVT_Hash** table) {
1356 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1357 LVT_Hash* current = table[i];
1358 LVT_Hash* next;
1359 while (current != NULL) {
1360 next = current->_next;
1361 current->_next = NULL;
1362 delete(current);
1363 current = next;
1364 }
1365 table[i] = NULL;
1366 }
1367 }
1368
1369 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1370 LVT_Hash* entry = table[index];
1371
1372 /*
1373 * 3-tuple start_bci/length/slot has to be unique key,
1374 * so the following comparison seems to be redundant:
1375 * && elem->name_cp_index == entry->_elem->name_cp_index
1376 */
1377 while (entry != NULL) {
1378 if (elem->start_bci == entry->_elem->start_bci
1379 && elem->length == entry->_elem->length
1380 && elem->name_cp_index == entry->_elem->name_cp_index
1381 && elem->slot == entry->_elem->slot
1382 ) {
1383 return entry;
1384 }
1385 entry = entry->_next;
1386 }
1387 return NULL;
1388 }
1389
1390 // Return false if the local variable is found in table.
1391 // Return true if no duplicate is found.
1392 // And local variable is added as a new entry in table.
1393 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1394 // First lookup for duplicates
1395 int index = hash(elem);
1396 LVT_Hash* entry = LVT_lookup(elem, index, table);
1397
1398 if (entry != NULL) {
1399 return false;
1400 }
1401 // No duplicate is found, allocate a new entry and fill it.
1402 if ((entry = new LVT_Hash()) == NULL) {
1403 return false;
1404 }
1405 entry->_elem = elem;
1406
1407 // Insert into hash table
1408 entry->_next = table[index];
1409 table[index] = entry;
1410
1411 return true;
1412 }
1413
1414 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1415 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1416 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1417 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1418 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1419 lvt->signature_cp_index = 0;
1420 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1421 }
1422
1423 // Function is used to parse both attributes:
1424 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1425 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1426 u2 max_locals,
1427 u4 code_attribute_length,
1428 constantPoolHandle cp,
1429 u2* localvariable_table_length,
1430 bool isLVTT,
1431 TRAPS) {
1432 ClassFileStream* cfs = stream();
1433 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1434 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1435 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1436 // Verify local variable table attribute has right length
1437 if (_need_verify) {
1438 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1439 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1440 }
1441 u2* localvariable_table_start = cfs->get_u2_buffer();
1442 assert(localvariable_table_start != NULL, "null local variable table");
1443 if (!_need_verify) {
1444 cfs->skip_u2_fast(size);
1445 } else {
1446 cfs->guarantee_more(size * 2, CHECK_NULL);
1447 for(int i = 0; i < (*localvariable_table_length); i++) {
1448 u2 start_pc = cfs->get_u2_fast();
1449 u2 length = cfs->get_u2_fast();
1450 u2 name_index = cfs->get_u2_fast();
1451 u2 descriptor_index = cfs->get_u2_fast();
1452 u2 index = cfs->get_u2_fast();
1453 // Assign to a u4 to avoid overflow
1454 u4 end_pc = (u4)start_pc + (u4)length;
1455
1456 if (start_pc >= code_length) {
1457 classfile_parse_error(
1458 "Invalid start_pc %u in %s in class file %s",
1459 start_pc, tbl_name, CHECK_NULL);
1460 }
1461 if (end_pc > code_length) {
1462 classfile_parse_error(
1463 "Invalid length %u in %s in class file %s",
1464 length, tbl_name, CHECK_NULL);
1465 }
1466 int cp_size = cp->length();
1467 guarantee_property(
1468 valid_cp_range(name_index, cp_size) &&
1469 cp->tag_at(name_index).is_utf8(),
1470 "Name index %u in %s has bad constant type in class file %s",
1471 name_index, tbl_name, CHECK_NULL);
1472 guarantee_property(
1473 valid_cp_range(descriptor_index, cp_size) &&
1474 cp->tag_at(descriptor_index).is_utf8(),
1475 "Signature index %u in %s has bad constant type in class file %s",
1476 descriptor_index, tbl_name, CHECK_NULL);
1477
1478 Symbol* name = cp->symbol_at(name_index);
1479 Symbol* sig = cp->symbol_at(descriptor_index);
1480 verify_legal_field_name(name, CHECK_NULL);
1481 u2 extra_slot = 0;
1482 if (!isLVTT) {
1483 verify_legal_field_signature(name, sig, CHECK_NULL);
1484
1485 // 4894874: check special cases for double and long local variables
1486 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1487 sig == vmSymbols::type_signature(T_LONG)) {
1488 extra_slot = 1;
1489 }
1490 }
1491 guarantee_property((index + extra_slot) < max_locals,
1492 "Invalid index %u in %s in class file %s",
1493 index, tbl_name, CHECK_NULL);
1494 }
1495 }
1496 return localvariable_table_start;
1497 }
1498
1499
1500 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1501 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1502 ClassFileStream* cfs = stream();
1503 u2 index = 0; // index in the array with long/double occupying two slots
1504 u4 i1 = *u1_index;
1505 u4 i2 = *u2_index + 1;
1506 for(int i = 0; i < array_length; i++) {
1507 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1508 index++;
1509 if (tag == ITEM_Long || tag == ITEM_Double) {
1510 index++;
1511 } else if (tag == ITEM_Object) {
1512 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1513 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1514 is_klass_reference(cp, class_index),
1515 "Bad class index %u in StackMap in class file %s",
1516 class_index, CHECK);
1517 } else if (tag == ITEM_Uninitialized) {
1518 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1519 guarantee_property(
1520 offset < code_length,
1521 "Bad uninitialized type offset %u in StackMap in class file %s",
1522 offset, CHECK);
1523 } else {
1524 guarantee_property(
1525 tag <= (u1)ITEM_Uninitialized,
1526 "Unknown variable type %u in StackMap in class file %s",
1527 tag, CHECK);
1528 }
1529 }
1530 u2_array[*u2_index] = index;
1531 *u1_index = i1;
1532 *u2_index = i2;
1533 }
1534
1535 typeArrayOop ClassFileParser::parse_stackmap_table(
1536 u4 code_attribute_length, TRAPS) {
1537 if (code_attribute_length == 0)
1538 return NULL;
1539
1540 ClassFileStream* cfs = stream();
1541 u1* stackmap_table_start = cfs->get_u1_buffer();
1542 assert(stackmap_table_start != NULL, "null stackmap table");
1543
1544 // check code_attribute_length first
1545 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1546
1547 if (!_need_verify && !DumpSharedSpaces) {
1548 return NULL;
1549 }
1550
1551 typeArrayOop stackmap_data =
1552 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1553
1554 stackmap_data->set_length(code_attribute_length);
1555 memcpy((void*)stackmap_data->byte_at_addr(0),
1556 (void*)stackmap_table_start, code_attribute_length);
1557 return stackmap_data;
1558 }
1559
1560 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1561 u4 method_attribute_length,
1562 constantPoolHandle cp, TRAPS) {
1563 ClassFileStream* cfs = stream();
1564 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1565 *checked_exceptions_length = cfs->get_u2_fast();
1566 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1567 u2* checked_exceptions_start = cfs->get_u2_buffer();
1568 assert(checked_exceptions_start != NULL, "null checked exceptions");
1569 if (!_need_verify) {
1570 cfs->skip_u2_fast(size);
1571 } else {
1572 // Verify each value in the checked exception table
1573 u2 checked_exception;
1574 u2 len = *checked_exceptions_length;
1575 cfs->guarantee_more(2 * len, CHECK_NULL);
1576 for (int i = 0; i < len; i++) {
1577 checked_exception = cfs->get_u2_fast();
1578 check_property(
1579 valid_cp_range(checked_exception, cp->length()) &&
1580 is_klass_reference(cp, checked_exception),
1581 "Exception name has bad type at constant pool %u in class file %s",
1582 checked_exception, CHECK_NULL);
1583 }
1584 }
1585 // check exceptions attribute length
1586 if (_need_verify) {
1587 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1588 sizeof(u2) * size),
1589 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1590 }
1591 return checked_exceptions_start;
1592 }
1593
1594 void ClassFileParser::throwIllegalSignature(
1595 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1596 ResourceMark rm(THREAD);
1597 Exceptions::fthrow(THREAD_AND_LOCATION,
1598 vmSymbols::java_lang_ClassFormatError(),
1599 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1600 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1601 }
1602
1603 #define MAX_ARGS_SIZE 255
1604 #define MAX_CODE_SIZE 65535
1605 #define INITIAL_MAX_LVT_NUMBER 256
1606
1607 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1608 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1609 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1610 // entire method attribute is parsed.
1611 //
1612 // The promoted_flags parameter is used to pass relevant access_flags
1613 // from the method back up to the containing klass. These flag values
1614 // are added to klass's access_flags.
1615
1616 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1617 AccessFlags *promoted_flags,
1618 typeArrayHandle* method_annotations,
1619 typeArrayHandle* method_parameter_annotations,
1620 typeArrayHandle* method_default_annotations,
1621 TRAPS) {
1622 ClassFileStream* cfs = stream();
1623 methodHandle nullHandle;
1624 ResourceMark rm(THREAD);
1625 // Parse fixed parts
1626 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1627
1628 int flags = cfs->get_u2_fast();
1629 u2 name_index = cfs->get_u2_fast();
1630 int cp_size = cp->length();
1631 check_property(
1632 valid_cp_range(name_index, cp_size) &&
1633 cp->tag_at(name_index).is_utf8(),
1634 "Illegal constant pool index %u for method name in class file %s",
1635 name_index, CHECK_(nullHandle));
1636 Symbol* name = cp->symbol_at(name_index);
1637 verify_legal_method_name(name, CHECK_(nullHandle));
1638
1639 u2 signature_index = cfs->get_u2_fast();
1640 guarantee_property(
1641 valid_cp_range(signature_index, cp_size) &&
1642 cp->tag_at(signature_index).is_utf8(),
1643 "Illegal constant pool index %u for method signature in class file %s",
1644 signature_index, CHECK_(nullHandle));
1645 Symbol* signature = cp->symbol_at(signature_index);
1646
1647 AccessFlags access_flags;
1648 if (name == vmSymbols::class_initializer_name()) {
1649 // We ignore the other access flags for a valid class initializer.
1650 // (JVM Spec 2nd ed., chapter 4.6)
1651 if (_major_version < 51) { // backward compatibility
1652 flags = JVM_ACC_STATIC;
1653 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1654 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1655 }
1656 } else {
1657 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1658 }
1659
1660 int args_size = -1; // only used when _need_verify is true
1661 if (_need_verify) {
1662 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1663 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1664 if (args_size > MAX_ARGS_SIZE) {
1665 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1666 }
1667 }
1668
1669 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1670
1671 // Default values for code and exceptions attribute elements
1672 u2 max_stack = 0;
1673 u2 max_locals = 0;
1674 u4 code_length = 0;
1675 u1* code_start = 0;
1676 u2 exception_table_length = 0;
1677 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1678 u2 checked_exceptions_length = 0;
1679 u2* checked_exceptions_start = NULL;
1680 CompressedLineNumberWriteStream* linenumber_table = NULL;
1681 int linenumber_table_length = 0;
1682 int total_lvt_length = 0;
1683 u2 lvt_cnt = 0;
1684 u2 lvtt_cnt = 0;
1685 bool lvt_allocated = false;
1686 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1687 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1688 u2* localvariable_table_length;
1689 u2** localvariable_table_start;
1690 u2* localvariable_type_table_length;
1691 u2** localvariable_type_table_start;
1692 bool parsed_code_attribute = false;
1693 bool parsed_checked_exceptions_attribute = false;
1694 bool parsed_stackmap_attribute = false;
1695 // stackmap attribute - JDK1.5
1696 typeArrayHandle stackmap_data;
1697 u2 generic_signature_index = 0;
1698 u1* runtime_visible_annotations = NULL;
1699 int runtime_visible_annotations_length = 0;
1700 u1* runtime_invisible_annotations = NULL;
1701 int runtime_invisible_annotations_length = 0;
1702 u1* runtime_visible_parameter_annotations = NULL;
1703 int runtime_visible_parameter_annotations_length = 0;
1704 u1* runtime_invisible_parameter_annotations = NULL;
1705 int runtime_invisible_parameter_annotations_length = 0;
1706 u1* annotation_default = NULL;
1707 int annotation_default_length = 0;
1708
1709 // Parse code and exceptions attribute
1710 u2 method_attributes_count = cfs->get_u2_fast();
1711 while (method_attributes_count--) {
1712 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1713 u2 method_attribute_name_index = cfs->get_u2_fast();
1714 u4 method_attribute_length = cfs->get_u4_fast();
1715 check_property(
1716 valid_cp_range(method_attribute_name_index, cp_size) &&
1717 cp->tag_at(method_attribute_name_index).is_utf8(),
1718 "Invalid method attribute name index %u in class file %s",
1719 method_attribute_name_index, CHECK_(nullHandle));
1720
1721 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1722 if (method_attribute_name == vmSymbols::tag_code()) {
1723 // Parse Code attribute
1724 if (_need_verify) {
1725 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1726 "Code attribute in native or abstract methods in class file %s",
1727 CHECK_(nullHandle));
1728 }
1729 if (parsed_code_attribute) {
1730 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1731 }
1732 parsed_code_attribute = true;
1733
1734 // Stack size, locals size, and code size
1735 if (_major_version == 45 && _minor_version <= 2) {
1736 cfs->guarantee_more(4, CHECK_(nullHandle));
1737 max_stack = cfs->get_u1_fast();
1738 max_locals = cfs->get_u1_fast();
1739 code_length = cfs->get_u2_fast();
1740 } else {
1741 cfs->guarantee_more(8, CHECK_(nullHandle));
1742 max_stack = cfs->get_u2_fast();
1743 max_locals = cfs->get_u2_fast();
1744 code_length = cfs->get_u4_fast();
1745 }
1746 if (_need_verify) {
1747 guarantee_property(args_size <= max_locals,
1748 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1749 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1750 "Invalid method Code length %u in class file %s",
1751 code_length, CHECK_(nullHandle));
1752 }
1753 // Code pointer
1754 code_start = cfs->get_u1_buffer();
1755 assert(code_start != NULL, "null code start");
1756 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1757 cfs->skip_u1_fast(code_length);
1758
1759 // Exception handler table
1760 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1761 exception_table_length = cfs->get_u2_fast();
1762 if (exception_table_length > 0) {
1763 exception_handlers =
1764 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1765 }
1766
1767 // Parse additional attributes in code attribute
1768 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1769 u2 code_attributes_count = cfs->get_u2_fast();
1770
1771 unsigned int calculated_attribute_length = 0;
1772
1773 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1774 calculated_attribute_length =
1775 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1776 } else {
1777 // max_stack, locals and length are smaller in pre-version 45.2 classes
1778 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1779 }
1780 calculated_attribute_length +=
1781 code_length +
1782 sizeof(exception_table_length) +
1783 sizeof(code_attributes_count) +
1784 exception_table_length *
1785 ( sizeof(u2) + // start_pc
1786 sizeof(u2) + // end_pc
1787 sizeof(u2) + // handler_pc
1788 sizeof(u2) ); // catch_type_index
1789
1790 while (code_attributes_count--) {
1791 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1792 u2 code_attribute_name_index = cfs->get_u2_fast();
1793 u4 code_attribute_length = cfs->get_u4_fast();
1794 calculated_attribute_length += code_attribute_length +
1795 sizeof(code_attribute_name_index) +
1796 sizeof(code_attribute_length);
1797 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1798 cp->tag_at(code_attribute_name_index).is_utf8(),
1799 "Invalid code attribute name index %u in class file %s",
1800 code_attribute_name_index,
1801 CHECK_(nullHandle));
1802 if (LoadLineNumberTables &&
1803 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1804 // Parse and compress line number table
1805 parse_linenumber_table(code_attribute_length, code_length,
1806 &linenumber_table, CHECK_(nullHandle));
1807
1808 } else if (LoadLocalVariableTables &&
1809 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1810 // Parse local variable table
1811 if (!lvt_allocated) {
1812 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1813 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1814 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1815 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1816 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1817 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1818 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1819 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1820 lvt_allocated = true;
1821 }
1822 if (lvt_cnt == max_lvt_cnt) {
1823 max_lvt_cnt <<= 1;
1824 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1825 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1826 }
1827 localvariable_table_start[lvt_cnt] =
1828 parse_localvariable_table(code_length,
1829 max_locals,
1830 code_attribute_length,
1831 cp,
1832 &localvariable_table_length[lvt_cnt],
1833 false, // is not LVTT
1834 CHECK_(nullHandle));
1835 total_lvt_length += localvariable_table_length[lvt_cnt];
1836 lvt_cnt++;
1837 } else if (LoadLocalVariableTypeTables &&
1838 _major_version >= JAVA_1_5_VERSION &&
1839 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1840 if (!lvt_allocated) {
1841 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1842 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1843 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1844 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1845 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1846 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1847 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1848 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1849 lvt_allocated = true;
1850 }
1851 // Parse local variable type table
1852 if (lvtt_cnt == max_lvtt_cnt) {
1853 max_lvtt_cnt <<= 1;
1854 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1855 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1856 }
1857 localvariable_type_table_start[lvtt_cnt] =
1858 parse_localvariable_table(code_length,
1859 max_locals,
1860 code_attribute_length,
1861 cp,
1862 &localvariable_type_table_length[lvtt_cnt],
1863 true, // is LVTT
1864 CHECK_(nullHandle));
1865 lvtt_cnt++;
1866 } else if (UseSplitVerifier &&
1867 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1868 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1869 // Stack map is only needed by the new verifier in JDK1.5.
1870 if (parsed_stackmap_attribute) {
1871 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1872 }
1873 typeArrayOop sm =
1874 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1875 stackmap_data = typeArrayHandle(THREAD, sm);
1876 parsed_stackmap_attribute = true;
1877 } else {
1878 // Skip unknown attributes
1879 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1880 }
1881 }
1882 // check method attribute length
1883 if (_need_verify) {
1884 guarantee_property(method_attribute_length == calculated_attribute_length,
1885 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1886 }
1887 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1888 // Parse Exceptions attribute
1889 if (parsed_checked_exceptions_attribute) {
1890 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1891 }
1892 parsed_checked_exceptions_attribute = true;
1893 checked_exceptions_start =
1894 parse_checked_exceptions(&checked_exceptions_length,
1895 method_attribute_length,
1896 cp, CHECK_(nullHandle));
1897 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1898 if (method_attribute_length != 0) {
1899 classfile_parse_error(
1900 "Invalid Synthetic method attribute length %u in class file %s",
1901 method_attribute_length, CHECK_(nullHandle));
1902 }
1903 // Should we check that there hasn't already been a synthetic attribute?
1904 access_flags.set_is_synthetic();
1905 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1906 if (method_attribute_length != 0) {
1907 classfile_parse_error(
1908 "Invalid Deprecated method attribute length %u in class file %s",
1909 method_attribute_length, CHECK_(nullHandle));
1910 }
1911 } else if (_major_version >= JAVA_1_5_VERSION) {
1912 if (method_attribute_name == vmSymbols::tag_signature()) {
1913 if (method_attribute_length != 2) {
1914 classfile_parse_error(
1915 "Invalid Signature attribute length %u in class file %s",
1916 method_attribute_length, CHECK_(nullHandle));
1917 }
1918 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1919 generic_signature_index = cfs->get_u2_fast();
1920 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1921 runtime_visible_annotations_length = method_attribute_length;
1922 runtime_visible_annotations = cfs->get_u1_buffer();
1923 assert(runtime_visible_annotations != NULL, "null visible annotations");
1924 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1925 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1926 runtime_invisible_annotations_length = method_attribute_length;
1927 runtime_invisible_annotations = cfs->get_u1_buffer();
1928 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1929 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1930 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1931 runtime_visible_parameter_annotations_length = method_attribute_length;
1932 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1933 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1934 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1935 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1936 runtime_invisible_parameter_annotations_length = method_attribute_length;
1937 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1938 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1939 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1940 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1941 annotation_default_length = method_attribute_length;
1942 annotation_default = cfs->get_u1_buffer();
1943 assert(annotation_default != NULL, "null annotation default");
1944 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1945 } else {
1946 // Skip unknown attributes
1947 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1948 }
1949 } else {
1950 // Skip unknown attributes
1951 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1952 }
1953 }
1954
1955 if (linenumber_table != NULL) {
1956 linenumber_table->write_terminator();
1957 linenumber_table_length = linenumber_table->position();
1958 }
1959
1960 // Make sure there's at least one Code attribute in non-native/non-abstract method
1961 if (_need_verify) {
1962 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1963 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1964 }
1965
1966 // All sizing information for a methodOop is finally available, now create it
1967 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1968 total_lvt_length, checked_exceptions_length,
1969 oopDesc::IsSafeConc, CHECK_(nullHandle));
1970 methodHandle m (THREAD, m_oop);
1971
1972 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1973
1974 // Fill in information from fixed part (access_flags already set)
1975 m->set_constants(cp());
1976 m->set_name_index(name_index);
1977 m->set_signature_index(signature_index);
1978 m->set_generic_signature_index(generic_signature_index);
1979 #ifdef CC_INTERP
1980 // hmm is there a gc issue here??
1981 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1982 m->set_result_index(rtf.type());
1983 #endif
1984
1985 if (args_size >= 0) {
1986 m->set_size_of_parameters(args_size);
1987 } else {
1988 m->compute_size_of_parameters(THREAD);
1989 }
1990 #ifdef ASSERT
1991 if (args_size >= 0) {
1992 m->compute_size_of_parameters(THREAD);
1993 assert(args_size == m->size_of_parameters(), "");
1994 }
1995 #endif
1996
1997 // Fill in code attribute information
1998 m->set_max_stack(max_stack);
1999 m->set_max_locals(max_locals);
2000 m->constMethod()->set_stackmap_data(stackmap_data());
2001
2002 /**
2003 * The exception_table field is the flag used to indicate
2004 * that the methodOop and it's associated constMethodOop are partially
2005 * initialized and thus are exempt from pre/post GC verification. Once
2006 * the field is set, the oops are considered fully initialized so make
2007 * sure that the oops can pass verification when this field is set.
2008 */
2009 m->set_exception_table(exception_handlers());
2010
2011 // Copy byte codes
2012 m->set_code(code_start);
2013
2014 // Copy line number table
2015 if (linenumber_table != NULL) {
2016 memcpy(m->compressed_linenumber_table(),
2017 linenumber_table->buffer(), linenumber_table_length);
2018 }
2019
2020 // Copy checked exceptions
2021 if (checked_exceptions_length > 0) {
2022 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2023 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2024 }
2025
2026 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2027 *
2028 * Rules for LVT's and LVTT's are:
2029 * - There can be any number of LVT's and LVTT's.
2030 * - If there are n LVT's, it is the same as if there was just
2031 * one LVT containing all the entries from the n LVT's.
2032 * - There may be no more than one LVT entry per local variable.
2033 * Two LVT entries are 'equal' if these fields are the same:
2034 * start_pc, length, name, slot
2035 * - There may be no more than one LVTT entry per each LVT entry.
2036 * Each LVTT entry has to match some LVT entry.
2037 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2038 */
2039 if (total_lvt_length > 0) {
2040 int tbl_no, idx;
2041
2042 promoted_flags->set_has_localvariable_table();
2043
2044 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2045 initialize_hashtable(lvt_Hash);
2046
2047 // To fill LocalVariableTable in
2048 Classfile_LVT_Element* cf_lvt;
2049 LocalVariableTableElement* lvt = m->localvariable_table_start();
2050
2051 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2052 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2053 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2054 copy_lvt_element(&cf_lvt[idx], lvt);
2055 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2056 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2057 && _need_verify
2058 && _major_version >= JAVA_1_5_VERSION ) {
2059 clear_hashtable(lvt_Hash);
2060 classfile_parse_error("Duplicated LocalVariableTable attribute "
2061 "entry for '%s' in class file %s",
2062 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2063 CHECK_(nullHandle));
2064 }
2065 }
2066 }
2067
2068 // To merge LocalVariableTable and LocalVariableTypeTable
2069 Classfile_LVT_Element* cf_lvtt;
2070 LocalVariableTableElement lvtt_elem;
2071
2072 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2073 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2074 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2075 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2076 int index = hash(&lvtt_elem);
2077 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2078 if (entry == NULL) {
2079 if (_need_verify) {
2080 clear_hashtable(lvt_Hash);
2081 classfile_parse_error("LVTT entry for '%s' in class file %s "
2082 "does not match any LVT entry",
2083 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2084 CHECK_(nullHandle));
2085 }
2086 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2087 clear_hashtable(lvt_Hash);
2088 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2089 "entry for '%s' in class file %s",
2090 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2091 CHECK_(nullHandle));
2092 } else {
2093 // to add generic signatures into LocalVariableTable
2094 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2095 }
2096 }
2097 }
2098 clear_hashtable(lvt_Hash);
2099 }
2100
2101 *method_annotations = assemble_annotations(runtime_visible_annotations,
2102 runtime_visible_annotations_length,
2103 runtime_invisible_annotations,
2104 runtime_invisible_annotations_length,
2105 CHECK_(nullHandle));
2106 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2107 runtime_visible_parameter_annotations_length,
2108 runtime_invisible_parameter_annotations,
2109 runtime_invisible_parameter_annotations_length,
2110 CHECK_(nullHandle));
2111 *method_default_annotations = assemble_annotations(annotation_default,
2112 annotation_default_length,
2113 NULL,
2114 0,
2115 CHECK_(nullHandle));
2116
2117 if (name == vmSymbols::finalize_method_name() &&
2118 signature == vmSymbols::void_method_signature()) {
2119 if (m->is_empty_method()) {
2120 _has_empty_finalizer = true;
2121 } else {
2122 _has_finalizer = true;
2123 }
2124 }
2125 if (name == vmSymbols::object_initializer_name() &&
2126 signature == vmSymbols::void_method_signature() &&
2127 m->is_vanilla_constructor()) {
2128 _has_vanilla_constructor = true;
2129 }
2130
2131 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2132 m->is_method_handle_adapter())) {
2133 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2134 "Method handle invokers must be defined internally to the VM", nullHandle);
2135 }
2136
2137 return m;
2138 }
2139
2140
2141 // The promoted_flags parameter is used to pass relevant access_flags
2142 // from the methods back up to the containing klass. These flag values
2143 // are added to klass's access_flags.
2144
2145 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2146 AccessFlags* promoted_flags,
2147 bool* has_final_method,
2148 objArrayOop* methods_annotations_oop,
2149 objArrayOop* methods_parameter_annotations_oop,
2150 objArrayOop* methods_default_annotations_oop,
2151 TRAPS) {
2152 ClassFileStream* cfs = stream();
2153 objArrayHandle nullHandle;
2154 typeArrayHandle method_annotations;
2155 typeArrayHandle method_parameter_annotations;
2156 typeArrayHandle method_default_annotations;
2157 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2158 u2 length = cfs->get_u2_fast();
2159 if (length == 0) {
2160 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2161 } else {
2162 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2163 objArrayHandle methods(THREAD, m);
2164 HandleMark hm(THREAD);
2165 objArrayHandle methods_annotations;
2166 objArrayHandle methods_parameter_annotations;
2167 objArrayHandle methods_default_annotations;
2168 for (int index = 0; index < length; index++) {
2169 methodHandle method = parse_method(cp, is_interface,
2170 promoted_flags,
2171 &method_annotations,
2172 &method_parameter_annotations,
2173 &method_default_annotations,
2174 CHECK_(nullHandle));
2175 if (method->is_final()) {
2176 *has_final_method = true;
2177 }
2178 methods->obj_at_put(index, method());
2179 if (method_annotations.not_null()) {
2180 if (methods_annotations.is_null()) {
2181 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2182 methods_annotations = objArrayHandle(THREAD, md);
2183 }
2184 methods_annotations->obj_at_put(index, method_annotations());
2185 }
2186 if (method_parameter_annotations.not_null()) {
2187 if (methods_parameter_annotations.is_null()) {
2188 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2189 methods_parameter_annotations = objArrayHandle(THREAD, md);
2190 }
2191 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2192 }
2193 if (method_default_annotations.not_null()) {
2194 if (methods_default_annotations.is_null()) {
2195 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2196 methods_default_annotations = objArrayHandle(THREAD, md);
2197 }
2198 methods_default_annotations->obj_at_put(index, method_default_annotations());
2199 }
2200 }
2201 if (_need_verify && length > 1) {
2202 // Check duplicated methods
2203 ResourceMark rm(THREAD);
2204 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, NameSigHash*, HASH_ROW_SIZE);
2206 initialize_hashtable(names_and_sigs);
2207 bool dup = false;
2208 {
2209 debug_only(No_Safepoint_Verifier nsv;)
2210 for (int i = 0; i < length; i++) {
2211 methodOop m = (methodOop)methods->obj_at(i);
2212 // If no duplicates, add name/signature in hashtable names_and_sigs.
2213 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2214 dup = true;
2215 break;
2216 }
2217 }
2218 }
2219 if (dup) {
2220 classfile_parse_error("Duplicate method name&signature in class file %s",
2221 CHECK_(nullHandle));
2222 }
2223 }
2224
2225 *methods_annotations_oop = methods_annotations();
2226 *methods_parameter_annotations_oop = methods_parameter_annotations();
2227 *methods_default_annotations_oop = methods_default_annotations();
2228
2229 return methods;
2230 }
2231 }
2232
2233
2234 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2235 objArrayHandle methods_annotations,
2236 objArrayHandle methods_parameter_annotations,
2237 objArrayHandle methods_default_annotations,
2238 TRAPS) {
2239 typeArrayHandle nullHandle;
2240 int length = methods()->length();
2241 // If JVMTI original method ordering or sharing is enabled we have to
2242 // remember the original class file ordering.
2243 // We temporarily use the vtable_index field in the methodOop to store the
2244 // class file index, so we can read in after calling qsort.
2245 // Put the method ordering in the shared archive.
2246 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2247 for (int index = 0; index < length; index++) {
2248 methodOop m = methodOop(methods->obj_at(index));
2249 assert(!m->valid_vtable_index(), "vtable index should not be set");
2250 m->set_vtable_index(index);
2251 }
2252 }
2253 // Sort method array by ascending method name (for faster lookups & vtable construction)
2254 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2255 methodOopDesc::sort_methods(methods(),
2256 methods_annotations(),
2257 methods_parameter_annotations(),
2258 methods_default_annotations());
2259
2260 // If JVMTI original method ordering or sharing is enabled construct int
2261 // array remembering the original ordering
2262 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2263 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2264 typeArrayHandle method_ordering(THREAD, new_ordering);
2265 for (int index = 0; index < length; index++) {
2266 methodOop m = methodOop(methods->obj_at(index));
2267 int old_index = m->vtable_index();
2268 assert(old_index >= 0 && old_index < length, "invalid method index");
2269 method_ordering->int_at_put(index, old_index);
2270 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2271 }
2272 return method_ordering;
2273 } else {
2274 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2275 }
2276 }
2277
2278
2279 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2280 ClassFileStream* cfs = stream();
2281 cfs->guarantee_more(2, CHECK); // sourcefile_index
2282 u2 sourcefile_index = cfs->get_u2_fast();
2283 check_property(
2284 valid_cp_range(sourcefile_index, cp->length()) &&
2285 cp->tag_at(sourcefile_index).is_utf8(),
2286 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2287 sourcefile_index, CHECK);
2288 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2289 }
2290
2291
2292
2293 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2294 instanceKlassHandle k,
2295 int length, TRAPS) {
2296 ClassFileStream* cfs = stream();
2297 u1* sde_buffer = cfs->get_u1_buffer();
2298 assert(sde_buffer != NULL, "null sde buffer");
2299
2300 // Don't bother storing it if there is no way to retrieve it
2301 if (JvmtiExport::can_get_source_debug_extension()) {
2302 // Optimistically assume that only 1 byte UTF format is used
2303 // (common case)
2304 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2305 k->set_source_debug_extension(sde_symbol);
2306 // Note that set_source_debug_extension() increments the reference count
2307 // for its copy of the Symbol*, so use a TempNewSymbol here.
2308 }
2309 // Got utf8 string, set stream position forward
2310 cfs->skip_u1(length, CHECK);
2311 }
2312
2313
2314 // Inner classes can be static, private or protected (classic VM does this)
2315 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2316
2317 // Return number of classes in the inner classes attribute table
2318 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2319 ClassFileStream* cfs = stream();
2320 cfs->guarantee_more(2, CHECK_0); // length
2321 u2 length = cfs->get_u2_fast();
2322
2323 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2324 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2325 typeArrayHandle inner_classes(THREAD, ic);
2326 int index = 0;
2327 int cp_size = cp->length();
2328 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2329 for (int n = 0; n < length; n++) {
2330 // Inner class index
2331 u2 inner_class_info_index = cfs->get_u2_fast();
2332 check_property(
2333 inner_class_info_index == 0 ||
2334 (valid_cp_range(inner_class_info_index, cp_size) &&
2335 is_klass_reference(cp, inner_class_info_index)),
2336 "inner_class_info_index %u has bad constant type in class file %s",
2337 inner_class_info_index, CHECK_0);
2338 // Outer class index
2339 u2 outer_class_info_index = cfs->get_u2_fast();
2340 check_property(
2341 outer_class_info_index == 0 ||
2342 (valid_cp_range(outer_class_info_index, cp_size) &&
2343 is_klass_reference(cp, outer_class_info_index)),
2344 "outer_class_info_index %u has bad constant type in class file %s",
2345 outer_class_info_index, CHECK_0);
2346 // Inner class name
2347 u2 inner_name_index = cfs->get_u2_fast();
2348 check_property(
2349 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2350 cp->tag_at(inner_name_index).is_utf8()),
2351 "inner_name_index %u has bad constant type in class file %s",
2352 inner_name_index, CHECK_0);
2353 if (_need_verify) {
2354 guarantee_property(inner_class_info_index != outer_class_info_index,
2355 "Class is both outer and inner class in class file %s", CHECK_0);
2356 }
2357 // Access flags
2358 AccessFlags inner_access_flags;
2359 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2360 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2361 // Set abstract bit for old class files for backward compatibility
2362 flags |= JVM_ACC_ABSTRACT;
2363 }
2364 verify_legal_class_modifiers(flags, CHECK_0);
2365 inner_access_flags.set_flags(flags);
2366
2367 inner_classes->short_at_put(index++, inner_class_info_index);
2368 inner_classes->short_at_put(index++, outer_class_info_index);
2369 inner_classes->short_at_put(index++, inner_name_index);
2370 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2371 }
2372
2373 // 4347400: make sure there's no duplicate entry in the classes array
2374 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2375 for(int i = 0; i < inner_classes->length(); i += 4) {
2376 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2377 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2378 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2379 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2380 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2381 "Duplicate entry in InnerClasses in class file %s",
2382 CHECK_0);
2383 }
2384 }
2385 }
2386
2387 // Update instanceKlass with inner class info.
2388 k->set_inner_classes(inner_classes());
2389 return length;
2390 }
2391
2392 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2393 k->set_is_synthetic();
2394 }
2395
2396 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2397 ClassFileStream* cfs = stream();
2398 u2 signature_index = cfs->get_u2(CHECK);
2399 check_property(
2400 valid_cp_range(signature_index, cp->length()) &&
2401 cp->tag_at(signature_index).is_utf8(),
2402 "Invalid constant pool index %u in Signature attribute in class file %s",
2403 signature_index, CHECK);
2404 k->set_generic_signature(cp->symbol_at(signature_index));
2405 }
2406
2407 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2408 u4 attribute_byte_length, TRAPS) {
2409 ClassFileStream* cfs = stream();
2410 u1* current_start = cfs->current();
2411
2412 cfs->guarantee_more(2, CHECK); // length
2413 int attribute_array_length = cfs->get_u2_fast();
2414
2415 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2416 "Short length on BootstrapMethods in class file %s",
2417 CHECK);
2418
2419 // The attribute contains a counted array of counted tuples of shorts,
2420 // represending bootstrap specifiers:
2421 // length*{bootstrap_method_index, argument_count*{argument_index}}
2422 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2423 // operand_count = number of shorts in attr, except for leading length
2424
2425 // The attribute is copied into a short[] array.
2426 // The array begins with a series of short[2] pairs, one for each tuple.
2427 int index_size = (attribute_array_length * 2);
2428
2429 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2430 typeArrayHandle operands(THREAD, operands_oop);
2431 operands_oop = NULL; // tidy
2432
2433 int operand_fill_index = index_size;
2434 int cp_size = cp->length();
2435
2436 for (int n = 0; n < attribute_array_length; n++) {
2437 // Store a 32-bit offset into the header of the operand array.
2438 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2439 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2440
2441 // Read a bootstrap specifier.
2442 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2443 u2 bootstrap_method_index = cfs->get_u2_fast();
2444 u2 argument_count = cfs->get_u2_fast();
2445 check_property(
2446 valid_cp_range(bootstrap_method_index, cp_size) &&
2447 cp->tag_at(bootstrap_method_index).is_method_handle(),
2448 "bootstrap_method_index %u has bad constant type in class file %s",
2449 bootstrap_method_index,
2450 CHECK);
2451 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2452 operands->short_at_put(operand_fill_index++, argument_count);
2453
2454 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2455 for (int j = 0; j < argument_count; j++) {
2456 u2 argument_index = cfs->get_u2_fast();
2457 check_property(
2458 valid_cp_range(argument_index, cp_size) &&
2459 cp->tag_at(argument_index).is_loadable_constant(),
2460 "argument_index %u has bad constant type in class file %s",
2461 argument_index,
2462 CHECK);
2463 operands->short_at_put(operand_fill_index++, argument_index);
2464 }
2465 }
2466
2467 assert(operand_fill_index == operands()->length(), "exact fill");
2468 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2469
2470 u1* current_end = cfs->current();
2471 guarantee_property(current_end == current_start + attribute_byte_length,
2472 "Bad length on BootstrapMethods in class file %s",
2473 CHECK);
2474
2475 cp->set_operands(operands());
2476 }
2477
2478
2479 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2480 ClassFileStream* cfs = stream();
2481 // Set inner classes attribute to default sentinel
2482 k->set_inner_classes(Universe::the_empty_short_array());
2483 cfs->guarantee_more(2, CHECK); // attributes_count
2484 u2 attributes_count = cfs->get_u2_fast();
2485 bool parsed_sourcefile_attribute = false;
2486 bool parsed_innerclasses_attribute = false;
2487 bool parsed_enclosingmethod_attribute = false;
2488 bool parsed_bootstrap_methods_attribute = false;
2489 u1* runtime_visible_annotations = NULL;
2490 int runtime_visible_annotations_length = 0;
2491 u1* runtime_invisible_annotations = NULL;
2492 int runtime_invisible_annotations_length = 0;
2493 // Iterate over attributes
2494 while (attributes_count--) {
2495 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2496 u2 attribute_name_index = cfs->get_u2_fast();
2497 u4 attribute_length = cfs->get_u4_fast();
2498 check_property(
2499 valid_cp_range(attribute_name_index, cp->length()) &&
2500 cp->tag_at(attribute_name_index).is_utf8(),
2501 "Attribute name has bad constant pool index %u in class file %s",
2502 attribute_name_index, CHECK);
2503 Symbol* tag = cp->symbol_at(attribute_name_index);
2504 if (tag == vmSymbols::tag_source_file()) {
2505 // Check for SourceFile tag
2506 if (_need_verify) {
2507 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2508 }
2509 if (parsed_sourcefile_attribute) {
2510 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2511 } else {
2512 parsed_sourcefile_attribute = true;
2513 }
2514 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2515 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2516 // Check for SourceDebugExtension tag
2517 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2518 } else if (tag == vmSymbols::tag_inner_classes()) {
2519 // Check for InnerClasses tag
2520 if (parsed_innerclasses_attribute) {
2521 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2522 } else {
2523 parsed_innerclasses_attribute = true;
2524 }
2525 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2526 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2527 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2528 "Wrong InnerClasses attribute length in class file %s", CHECK);
2529 }
2530 } else if (tag == vmSymbols::tag_synthetic()) {
2531 // Check for Synthetic tag
2532 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2533 if (attribute_length != 0) {
2534 classfile_parse_error(
2535 "Invalid Synthetic classfile attribute length %u in class file %s",
2536 attribute_length, CHECK);
2537 }
2538 parse_classfile_synthetic_attribute(cp, k, CHECK);
2539 } else if (tag == vmSymbols::tag_deprecated()) {
2540 // Check for Deprecatd tag - 4276120
2541 if (attribute_length != 0) {
2542 classfile_parse_error(
2543 "Invalid Deprecated classfile attribute length %u in class file %s",
2544 attribute_length, CHECK);
2545 }
2546 } else if (_major_version >= JAVA_1_5_VERSION) {
2547 if (tag == vmSymbols::tag_signature()) {
2548 if (attribute_length != 2) {
2549 classfile_parse_error(
2550 "Wrong Signature attribute length %u in class file %s",
2551 attribute_length, CHECK);
2552 }
2553 parse_classfile_signature_attribute(cp, k, CHECK);
2554 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2555 runtime_visible_annotations_length = attribute_length;
2556 runtime_visible_annotations = cfs->get_u1_buffer();
2557 assert(runtime_visible_annotations != NULL, "null visible annotations");
2558 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2559 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2560 runtime_invisible_annotations_length = attribute_length;
2561 runtime_invisible_annotations = cfs->get_u1_buffer();
2562 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2563 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2564 } else if (tag == vmSymbols::tag_enclosing_method()) {
2565 if (parsed_enclosingmethod_attribute) {
2566 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2567 } else {
2568 parsed_enclosingmethod_attribute = true;
2569 }
2570 cfs->guarantee_more(4, CHECK); // class_index, method_index
2571 u2 class_index = cfs->get_u2_fast();
2572 u2 method_index = cfs->get_u2_fast();
2573 if (class_index == 0) {
2574 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2575 }
2576 // Validate the constant pool indices and types
2577 if (!cp->is_within_bounds(class_index) ||
2578 !is_klass_reference(cp, class_index)) {
2579 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2580 }
2581 if (method_index != 0 &&
2582 (!cp->is_within_bounds(method_index) ||
2583 !cp->tag_at(method_index).is_name_and_type())) {
2584 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2585 }
2586 k->set_enclosing_method_indices(class_index, method_index);
2587 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2588 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2589 if (parsed_bootstrap_methods_attribute)
2590 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2591 parsed_bootstrap_methods_attribute = true;
2592 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2593 } else {
2594 // Unknown attribute
2595 cfs->skip_u1(attribute_length, CHECK);
2596 }
2597 } else {
2598 // Unknown attribute
2599 cfs->skip_u1(attribute_length, CHECK);
2600 }
2601 }
2602 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2603 runtime_visible_annotations_length,
2604 runtime_invisible_annotations,
2605 runtime_invisible_annotations_length,
2606 CHECK);
2607 k->set_class_annotations(annotations());
2608
2609 if (_max_bootstrap_specifier_index >= 0) {
2610 guarantee_property(parsed_bootstrap_methods_attribute,
2611 "Missing BootstrapMethods attribute in class file %s", CHECK);
2612 }
2613 }
2614
2615
2616 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2617 int runtime_visible_annotations_length,
2618 u1* runtime_invisible_annotations,
2619 int runtime_invisible_annotations_length, TRAPS) {
2620 typeArrayHandle annotations;
2621 if (runtime_visible_annotations != NULL ||
2622 runtime_invisible_annotations != NULL) {
2623 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2624 runtime_invisible_annotations_length, CHECK_(annotations));
2625 annotations = typeArrayHandle(THREAD, anno);
2626 if (runtime_visible_annotations != NULL) {
2627 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2628 }
2629 if (runtime_invisible_annotations != NULL) {
2630 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2631 }
2632 }
2633 return annotations;
2634 }
2635
2636
2637 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2638 Handle class_loader,
2639 Handle protection_domain,
2640 KlassHandle host_klass,
2641 GrowableArray<Handle>* cp_patches,
2642 TempNewSymbol& parsed_name,
2643 bool verify,
2644 TRAPS) {
2645 // When a retransformable agent is attached, JVMTI caches the
2646 // class bytes that existed before the first retransformation.
2647 // If RedefineClasses() was used before the retransformable
2648 // agent attached, then the cached class bytes may not be the
2649 // original class bytes.
2650 unsigned char *cached_class_file_bytes = NULL;
2651 jint cached_class_file_length;
2652
2653 ClassFileStream* cfs = stream();
2654 // Timing
2655 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2656 JavaThread* jt = (JavaThread*) THREAD;
2657
2658 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2659 ClassLoader::perf_class_parse_selftime(),
2660 NULL,
2661 jt->get_thread_stat()->perf_recursion_counts_addr(),
2662 jt->get_thread_stat()->perf_timers_addr(),
2663 PerfClassTraceTime::PARSE_CLASS);
2664
2665 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2666 _max_bootstrap_specifier_index = -1;
2667
2668 if (JvmtiExport::should_post_class_file_load_hook()) {
2669 // Get the cached class file bytes (if any) from the class that
2670 // is being redefined or retransformed. We use jvmti_thread_state()
2671 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
2672 // a JvmtiThreadState any earlier than necessary. This will help
2673 // avoid the bug described by 7126851.
2674 JvmtiThreadState *state = jt->jvmti_thread_state();
2675 if (state != NULL) {
2676 KlassHandle *h_class_being_redefined =
2677 state->get_class_being_redefined();
2678 if (h_class_being_redefined != NULL) {
2679 instanceKlassHandle ikh_class_being_redefined =
2680 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
2681 cached_class_file_bytes =
2682 ikh_class_being_redefined->get_cached_class_file_bytes();
2683 cached_class_file_length =
2684 ikh_class_being_redefined->get_cached_class_file_len();
2685 }
2686 }
2687
2688 unsigned char* ptr = cfs->buffer();
2689 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2690
2691 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2692 &ptr, &end_ptr,
2693 &cached_class_file_bytes,
2694 &cached_class_file_length);
2695
2696 if (ptr != cfs->buffer()) {
2697 // JVMTI agent has modified class file data.
2698 // Set new class file stream using JVMTI agent modified
2699 // class file data.
2700 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2701 set_stream(cfs);
2702 }
2703 }
2704
2705 _host_klass = host_klass;
2706 _cp_patches = cp_patches;
2707
2708 instanceKlassHandle nullHandle;
2709
2710 // Figure out whether we can skip format checking (matching classic VM behavior)
2711 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2712
2713 // Set the verify flag in stream
2714 cfs->set_verify(_need_verify);
2715
2716 // Save the class file name for easier error message printing.
2717 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2718
2719 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2720 // Magic value
2721 u4 magic = cfs->get_u4_fast();
2722 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2723 "Incompatible magic value %u in class file %s",
2724 magic, CHECK_(nullHandle));
2725
2726 // Version numbers
2727 u2 minor_version = cfs->get_u2_fast();
2728 u2 major_version = cfs->get_u2_fast();
2729
2730 // Check version numbers - we check this even with verifier off
2731 if (!is_supported_version(major_version, minor_version)) {
2732 if (name == NULL) {
2733 Exceptions::fthrow(
2734 THREAD_AND_LOCATION,
2735 vmSymbols::java_lang_UnsupportedClassVersionError(),
2736 "Unsupported major.minor version %u.%u",
2737 major_version,
2738 minor_version);
2739 } else {
2740 ResourceMark rm(THREAD);
2741 Exceptions::fthrow(
2742 THREAD_AND_LOCATION,
2743 vmSymbols::java_lang_UnsupportedClassVersionError(),
2744 "%s : Unsupported major.minor version %u.%u",
2745 name->as_C_string(),
2746 major_version,
2747 minor_version);
2748 }
2749 return nullHandle;
2750 }
2751
2752 _major_version = major_version;
2753 _minor_version = minor_version;
2754
2755
2756 // Check if verification needs to be relaxed for this class file
2757 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2758 _relax_verify = Verifier::relax_verify_for(class_loader());
2759
2760 // Constant pool
2761 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2762 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2763
2764 int cp_size = cp->length();
2765
2766 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2767
2768 // Access flags
2769 AccessFlags access_flags;
2770 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2771
2772 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2773 // Set abstract bit for old class files for backward compatibility
2774 flags |= JVM_ACC_ABSTRACT;
2775 }
2776 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2777 access_flags.set_flags(flags);
2778
2779 // This class and superclass
2780 instanceKlassHandle super_klass;
2781 u2 this_class_index = cfs->get_u2_fast();
2782 check_property(
2783 valid_cp_range(this_class_index, cp_size) &&
2784 cp->tag_at(this_class_index).is_unresolved_klass(),
2785 "Invalid this class index %u in constant pool in class file %s",
2786 this_class_index, CHECK_(nullHandle));
2787
2788 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2789 assert(class_name != NULL, "class_name can't be null");
2790
2791 // It's important to set parsed_name *before* resolving the super class.
2792 // (it's used for cleanup by the caller if parsing fails)
2793 parsed_name = class_name;
2794 // parsed_name is returned and can be used if there's an error, so add to
2795 // its reference count. Caller will decrement the refcount.
2796 parsed_name->increment_refcount();
2797
2798 // Update _class_name which could be null previously to be class_name
2799 _class_name = class_name;
2800
2801 // Don't need to check whether this class name is legal or not.
2802 // It has been checked when constant pool is parsed.
2803 // However, make sure it is not an array type.
2804 if (_need_verify) {
2805 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2806 "Bad class name in class file %s",
2807 CHECK_(nullHandle));
2808 }
2809
2810 klassOop preserve_this_klass; // for storing result across HandleMark
2811
2812 // release all handles when parsing is done
2813 { HandleMark hm(THREAD);
2814
2815 // Checks if name in class file matches requested name
2816 if (name != NULL && class_name != name) {
2817 ResourceMark rm(THREAD);
2818 Exceptions::fthrow(
2819 THREAD_AND_LOCATION,
2820 vmSymbols::java_lang_NoClassDefFoundError(),
2821 "%s (wrong name: %s)",
2822 name->as_C_string(),
2823 class_name->as_C_string()
2824 );
2825 return nullHandle;
2826 }
2827
2828 if (TraceClassLoadingPreorder) {
2829 tty->print("[Loading %s", name->as_klass_external_name());
2830 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2831 tty->print_cr("]");
2832 }
2833
2834 u2 super_class_index = cfs->get_u2_fast();
2835 if (super_class_index == 0) {
2836 check_property(class_name == vmSymbols::java_lang_Object(),
2837 "Invalid superclass index %u in class file %s",
2838 super_class_index,
2839 CHECK_(nullHandle));
2840 } else {
2841 check_property(valid_cp_range(super_class_index, cp_size) &&
2842 is_klass_reference(cp, super_class_index),
2843 "Invalid superclass index %u in class file %s",
2844 super_class_index,
2845 CHECK_(nullHandle));
2846 // The class name should be legal because it is checked when parsing constant pool.
2847 // However, make sure it is not an array type.
2848 bool is_array = false;
2849 if (cp->tag_at(super_class_index).is_klass()) {
2850 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2851 if (_need_verify)
2852 is_array = super_klass->oop_is_array();
2853 } else if (_need_verify) {
2854 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2855 }
2856 if (_need_verify) {
2857 guarantee_property(!is_array,
2858 "Bad superclass name in class file %s", CHECK_(nullHandle));
2859 }
2860 }
2861
2862 // Interfaces
2863 u2 itfs_len = cfs->get_u2_fast();
2864 objArrayHandle local_interfaces;
2865 if (itfs_len == 0) {
2866 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2867 } else {
2868 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2869 }
2870
2871 u2 java_fields_count = 0;
2872 // Fields (offsets are filled in later)
2873 FieldAllocationCount fac;
2874 objArrayHandle fields_annotations;
2875 typeArrayHandle fields = parse_fields(class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
2876 &java_fields_count,
2877 CHECK_(nullHandle));
2878 // Methods
2879 bool has_final_method = false;
2880 AccessFlags promoted_flags;
2881 promoted_flags.set_flags(0);
2882 // These need to be oop pointers because they are allocated lazily
2883 // inside parse_methods inside a nested HandleMark
2884 objArrayOop methods_annotations_oop = NULL;
2885 objArrayOop methods_parameter_annotations_oop = NULL;
2886 objArrayOop methods_default_annotations_oop = NULL;
2887 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2888 &promoted_flags,
2889 &has_final_method,
2890 &methods_annotations_oop,
2891 &methods_parameter_annotations_oop,
2892 &methods_default_annotations_oop,
2893 CHECK_(nullHandle));
2894
2895 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2896 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2897 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2898
2899 // We check super class after class file is parsed and format is checked
2900 if (super_class_index > 0 && super_klass.is_null()) {
2901 Symbol* sk = cp->klass_name_at(super_class_index);
2902 if (access_flags.is_interface()) {
2903 // Before attempting to resolve the superclass, check for class format
2904 // errors not checked yet.
2905 guarantee_property(sk == vmSymbols::java_lang_Object(),
2906 "Interfaces must have java.lang.Object as superclass in class file %s",
2907 CHECK_(nullHandle));
2908 }
2909 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2910 sk,
2911 class_loader,
2912 protection_domain,
2913 true,
2914 CHECK_(nullHandle));
2915
2916 KlassHandle kh (THREAD, k);
2917 super_klass = instanceKlassHandle(THREAD, kh());
2918 if (LinkWellKnownClasses) // my super class is well known to me
2919 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2920 }
2921 if (super_klass.not_null()) {
2922 if (super_klass->is_interface()) {
2923 ResourceMark rm(THREAD);
2924 Exceptions::fthrow(
2925 THREAD_AND_LOCATION,
2926 vmSymbols::java_lang_IncompatibleClassChangeError(),
2927 "class %s has interface %s as super class",
2928 class_name->as_klass_external_name(),
2929 super_klass->external_name()
2930 );
2931 return nullHandle;
2932 }
2933 // Make sure super class is not final
2934 if (super_klass->is_final()) {
2935 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2936 }
2937 }
2938
2939 // Compute the transitive list of all unique interfaces implemented by this class
2940 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2941
2942 // sort methods
2943 typeArrayHandle method_ordering = sort_methods(methods,
2944 methods_annotations,
2945 methods_parameter_annotations,
2946 methods_default_annotations,
2947 CHECK_(nullHandle));
2948
2949 // promote flags from parse_methods() to the klass' flags
2950 access_flags.add_promoted_flags(promoted_flags.as_int());
2951
2952 // Size of Java vtable (in words)
2953 int vtable_size = 0;
2954 int itable_size = 0;
2955 int num_miranda_methods = 0;
2956
2957 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2958 num_miranda_methods,
2959 super_klass(),
2960 methods(),
2961 access_flags,
2962 class_loader,
2963 class_name,
2964 local_interfaces(),
2965 CHECK_(nullHandle));
2966
2967 // Size of Java itable (in words)
2968 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2969
2970 // Field size and offset computation
2971 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2972 #ifndef PRODUCT
2973 int orig_nonstatic_field_size = 0;
2974 #endif
2975 int static_field_size = 0;
2976 int next_static_oop_offset;
2977 int next_static_double_offset;
2978 int next_static_word_offset;
2979 int next_static_short_offset;
2980 int next_static_byte_offset;
2981 int next_static_type_offset;
2982 int next_nonstatic_oop_offset;
2983 int next_nonstatic_double_offset;
2984 int next_nonstatic_word_offset;
2985 int next_nonstatic_short_offset;
2986 int next_nonstatic_byte_offset;
2987 int next_nonstatic_type_offset;
2988 int first_nonstatic_oop_offset;
2989 int first_nonstatic_field_offset;
2990 int next_nonstatic_field_offset;
2991
2992 // Calculate the starting byte offsets
2993 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
2994 next_static_double_offset = next_static_oop_offset +
2995 (fac.count[STATIC_OOP] * heapOopSize);
2996 if ( fac.count[STATIC_DOUBLE] &&
2997 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2998 Universe::field_type_should_be_aligned(T_LONG)) ) {
2999 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3000 }
3001
3002 next_static_word_offset = next_static_double_offset +
3003 (fac.count[STATIC_DOUBLE] * BytesPerLong);
3004 next_static_short_offset = next_static_word_offset +
3005 (fac.count[STATIC_WORD] * BytesPerInt);
3006 next_static_byte_offset = next_static_short_offset +
3007 (fac.count[STATIC_SHORT] * BytesPerShort);
3008 next_static_type_offset = align_size_up((next_static_byte_offset +
3009 fac.count[STATIC_BYTE] ), wordSize );
3010 static_field_size = (next_static_type_offset -
3011 next_static_oop_offset) / wordSize;
3012
3013 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3014 nonstatic_field_size * heapOopSize;
3015 next_nonstatic_field_offset = first_nonstatic_field_offset;
3016
3017 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE];
3018 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD];
3019 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT];
3020 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE];
3021 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP];
3022
3023 bool super_has_nonstatic_fields =
3024 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3025 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3026 ((nonstatic_double_count + nonstatic_word_count +
3027 nonstatic_short_count + nonstatic_byte_count +
3028 nonstatic_oop_count) != 0);
3029
3030
3031 // Prepare list of oops for oop map generation.
3032 int* nonstatic_oop_offsets;
3033 unsigned int* nonstatic_oop_counts;
3034 unsigned int nonstatic_oop_map_count = 0;
3035
3036 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3037 THREAD, int, nonstatic_oop_count + 1);
3038 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3039 THREAD, unsigned int, nonstatic_oop_count + 1);
3040
3041 first_nonstatic_oop_offset = 0; // will be set for first oop field
3042
3043 #ifndef PRODUCT
3044 if( PrintCompactFieldsSavings ) {
3045 next_nonstatic_double_offset = next_nonstatic_field_offset +
3046 (nonstatic_oop_count * heapOopSize);
3047 if ( nonstatic_double_count > 0 ) {
3048 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3049 }
3050 next_nonstatic_word_offset = next_nonstatic_double_offset +
3051 (nonstatic_double_count * BytesPerLong);
3052 next_nonstatic_short_offset = next_nonstatic_word_offset +
3053 (nonstatic_word_count * BytesPerInt);
3054 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3055 (nonstatic_short_count * BytesPerShort);
3056 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3057 nonstatic_byte_count ), heapOopSize );
3058 orig_nonstatic_field_size = nonstatic_field_size +
3059 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3060 }
3061 #endif
3062 bool compact_fields = CompactFields;
3063 int allocation_style = FieldsAllocationStyle;
3064 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3065 assert(false, "0 <= FieldsAllocationStyle <= 2");
3066 allocation_style = 1; // Optimistic
3067 }
3068
3069 // The next classes have predefined hard-coded fields offsets
3070 // (see in JavaClasses::compute_hard_coded_offsets()).
3071 // Use default fields allocation order for them.
3072 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3073 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3074 class_name == vmSymbols::java_lang_Class() ||
3075 class_name == vmSymbols::java_lang_ClassLoader() ||
3076 class_name == vmSymbols::java_lang_ref_Reference() ||
3077 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3078 class_name == vmSymbols::java_lang_StackTraceElement() ||
3079 class_name == vmSymbols::java_lang_String() ||
3080 class_name == vmSymbols::java_lang_Throwable() ||
3081 class_name == vmSymbols::java_lang_Boolean() ||
3082 class_name == vmSymbols::java_lang_Character() ||
3083 class_name == vmSymbols::java_lang_Float() ||
3084 class_name == vmSymbols::java_lang_Double() ||
3085 class_name == vmSymbols::java_lang_Byte() ||
3086 class_name == vmSymbols::java_lang_Short() ||
3087 class_name == vmSymbols::java_lang_Integer() ||
3088 class_name == vmSymbols::java_lang_Long())) {
3089 allocation_style = 0; // Allocate oops first
3090 compact_fields = false; // Don't compact fields
3091 }
3092
3093 if( allocation_style == 0 ) {
3094 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3095 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3096 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3097 (nonstatic_oop_count * heapOopSize);
3098 } else if( allocation_style == 1 ) {
3099 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3100 next_nonstatic_double_offset = next_nonstatic_field_offset;
3101 } else if( allocation_style == 2 ) {
3102 // Fields allocation: oops fields in super and sub classes are together.
3103 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3104 super_klass->nonstatic_oop_map_size() > 0 ) {
3105 int map_count = super_klass->nonstatic_oop_map_count();
3106 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3107 OopMapBlock* last_map = first_map + map_count - 1;
3108 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3109 if (next_offset == next_nonstatic_field_offset) {
3110 allocation_style = 0; // allocate oops first
3111 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3112 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3113 (nonstatic_oop_count * heapOopSize);
3114 }
3115 }
3116 if( allocation_style == 2 ) {
3117 allocation_style = 1; // allocate oops last
3118 next_nonstatic_double_offset = next_nonstatic_field_offset;
3119 }
3120 } else {
3121 ShouldNotReachHere();
3122 }
3123
3124 int nonstatic_oop_space_count = 0;
3125 int nonstatic_word_space_count = 0;
3126 int nonstatic_short_space_count = 0;
3127 int nonstatic_byte_space_count = 0;
3128 int nonstatic_oop_space_offset;
3129 int nonstatic_word_space_offset;
3130 int nonstatic_short_space_offset;
3131 int nonstatic_byte_space_offset;
3132
3133 if( nonstatic_double_count > 0 ) {
3134 int offset = next_nonstatic_double_offset;
3135 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3136 if( compact_fields && offset != next_nonstatic_double_offset ) {
3137 // Allocate available fields into the gap before double field.
3138 int length = next_nonstatic_double_offset - offset;
3139 assert(length == BytesPerInt, "");
3140 nonstatic_word_space_offset = offset;
3141 if( nonstatic_word_count > 0 ) {
3142 nonstatic_word_count -= 1;
3143 nonstatic_word_space_count = 1; // Only one will fit
3144 length -= BytesPerInt;
3145 offset += BytesPerInt;
3146 }
3147 nonstatic_short_space_offset = offset;
3148 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3149 nonstatic_short_count -= 1;
3150 nonstatic_short_space_count += 1;
3151 length -= BytesPerShort;
3152 offset += BytesPerShort;
3153 }
3154 nonstatic_byte_space_offset = offset;
3155 while( length > 0 && nonstatic_byte_count > 0 ) {
3156 nonstatic_byte_count -= 1;
3157 nonstatic_byte_space_count += 1;
3158 length -= 1;
3159 }
3160 // Allocate oop field in the gap if there are no other fields for that.
3161 nonstatic_oop_space_offset = offset;
3162 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3163 allocation_style != 0 ) { // when oop fields not first
3164 nonstatic_oop_count -= 1;
3165 nonstatic_oop_space_count = 1; // Only one will fit
3166 length -= heapOopSize;
3167 offset += heapOopSize;
3168 }
3169 }
3170 }
3171
3172 next_nonstatic_word_offset = next_nonstatic_double_offset +
3173 (nonstatic_double_count * BytesPerLong);
3174 next_nonstatic_short_offset = next_nonstatic_word_offset +
3175 (nonstatic_word_count * BytesPerInt);
3176 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3177 (nonstatic_short_count * BytesPerShort);
3178
3179 int notaligned_offset;
3180 if( allocation_style == 0 ) {
3181 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3182 } else { // allocation_style == 1
3183 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3184 if( nonstatic_oop_count > 0 ) {
3185 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3186 }
3187 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3188 }
3189 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3190 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3191 - first_nonstatic_field_offset)/heapOopSize);
3192
3193 // Iterate over fields again and compute correct offsets.
3194 // The field allocation type was temporarily stored in the offset slot.
3195 // oop fields are located before non-oop fields (static and non-static).
3196 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3197 int real_offset;
3198 FieldAllocationType atype = (FieldAllocationType) fs.offset();
3199 switch (atype) {
3200 case STATIC_OOP:
3201 real_offset = next_static_oop_offset;
3202 next_static_oop_offset += heapOopSize;
3203 break;
3204 case STATIC_BYTE:
3205 real_offset = next_static_byte_offset;
3206 next_static_byte_offset += 1;
3207 break;
3208 case STATIC_SHORT:
3209 real_offset = next_static_short_offset;
3210 next_static_short_offset += BytesPerShort;
3211 break;
3212 case STATIC_WORD:
3213 real_offset = next_static_word_offset;
3214 next_static_word_offset += BytesPerInt;
3215 break;
3216 case STATIC_DOUBLE:
3217 real_offset = next_static_double_offset;
3218 next_static_double_offset += BytesPerLong;
3219 break;
3220 case NONSTATIC_OOP:
3221 if( nonstatic_oop_space_count > 0 ) {
3222 real_offset = nonstatic_oop_space_offset;
3223 nonstatic_oop_space_offset += heapOopSize;
3224 nonstatic_oop_space_count -= 1;
3225 } else {
3226 real_offset = next_nonstatic_oop_offset;
3227 next_nonstatic_oop_offset += heapOopSize;
3228 }
3229 // Update oop maps
3230 if( nonstatic_oop_map_count > 0 &&
3231 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3232 real_offset -
3233 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3234 heapOopSize ) {
3235 // Extend current oop map
3236 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3237 } else {
3238 // Create new oop map
3239 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3240 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3241 nonstatic_oop_map_count += 1;
3242 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3243 first_nonstatic_oop_offset = real_offset;
3244 }
3245 }
3246 break;
3247 case NONSTATIC_BYTE:
3248 if( nonstatic_byte_space_count > 0 ) {
3249 real_offset = nonstatic_byte_space_offset;
3250 nonstatic_byte_space_offset += 1;
3251 nonstatic_byte_space_count -= 1;
3252 } else {
3253 real_offset = next_nonstatic_byte_offset;
3254 next_nonstatic_byte_offset += 1;
3255 }
3256 break;
3257 case NONSTATIC_SHORT:
3258 if( nonstatic_short_space_count > 0 ) {
3259 real_offset = nonstatic_short_space_offset;
3260 nonstatic_short_space_offset += BytesPerShort;
3261 nonstatic_short_space_count -= 1;
3262 } else {
3263 real_offset = next_nonstatic_short_offset;
3264 next_nonstatic_short_offset += BytesPerShort;
3265 }
3266 break;
3267 case NONSTATIC_WORD:
3268 if( nonstatic_word_space_count > 0 ) {
3269 real_offset = nonstatic_word_space_offset;
3270 nonstatic_word_space_offset += BytesPerInt;
3271 nonstatic_word_space_count -= 1;
3272 } else {
3273 real_offset = next_nonstatic_word_offset;
3274 next_nonstatic_word_offset += BytesPerInt;
3275 }
3276 break;
3277 case NONSTATIC_DOUBLE:
3278 real_offset = next_nonstatic_double_offset;
3279 next_nonstatic_double_offset += BytesPerLong;
3280 break;
3281 default:
3282 ShouldNotReachHere();
3283 }
3284 fs.set_offset(real_offset);
3285 }
3286
3287 // Size of instances
3288 int instance_size;
3289
3290 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3291 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3292
3293 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3294
3295 // Number of non-static oop map blocks allocated at end of klass.
3296 const unsigned int total_oop_map_count =
3297 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3298 first_nonstatic_oop_offset);
3299
3300 // Compute reference type
3301 ReferenceType rt;
3302 if (super_klass() == NULL) {
3303 rt = REF_NONE;
3304 } else {
3305 rt = super_klass->reference_type();
3306 }
3307
3308 // We can now create the basic klassOop for this klass
3309 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3310 static_field_size,
3311 total_oop_map_count,
3312 rt, CHECK_(nullHandle));
3313 instanceKlassHandle this_klass (THREAD, ik);
3314
3315 assert(this_klass->static_field_size() == static_field_size, "sanity");
3316 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3317 "sanity");
3318
3319 // Fill in information already parsed
3320 this_klass->set_access_flags(access_flags);
3321 this_klass->set_should_verify_class(verify);
3322 jint lh = Klass::instance_layout_helper(instance_size, false);
3323 this_klass->set_layout_helper(lh);
3324 assert(this_klass->oop_is_instance(), "layout is correct");
3325 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3326 // Not yet: supers are done below to support the new subtype-checking fields
3327 //this_klass->set_super(super_klass());
3328 this_klass->set_class_loader(class_loader());
3329 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3330 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3331 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3332 cp->set_pool_holder(this_klass());
3333 error_handler.set_in_error(false); // turn off error handler for cp
3334 this_klass->set_constants(cp());
3335 this_klass->set_local_interfaces(local_interfaces());
3336 this_klass->set_fields(fields(), java_fields_count);
3337 this_klass->set_methods(methods());
3338 if (has_final_method) {
3339 this_klass->set_has_final_method();
3340 }
3341 this_klass->set_method_ordering(method_ordering());
3342 // The instanceKlass::_methods_jmethod_ids cache and the
3343 // instanceKlass::_methods_cached_itable_indices cache are
3344 // both managed on the assumption that the initial cache
3345 // size is equal to the number of methods in the class. If
3346 // that changes, then instanceKlass::idnum_can_increment()
3347 // has to be changed accordingly.
3348 this_klass->set_initial_method_idnum(methods->length());
3349 this_klass->set_name(cp->klass_name_at(this_class_index));
3350 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3351 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3352 this_klass->set_protection_domain(protection_domain());
3353 this_klass->set_fields_annotations(fields_annotations());
3354 this_klass->set_methods_annotations(methods_annotations());
3355 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3356 this_klass->set_methods_default_annotations(methods_default_annotations());
3357
3358 this_klass->set_minor_version(minor_version);
3359 this_klass->set_major_version(major_version);
3360
3361 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3362 // (We used to do this lazily, but now we query it in Rewriter,
3363 // which is eagerly done for every method, so we might as well do it now,
3364 // when everything is fresh in memory.)
3365 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3366 for (int j = 0; j < methods->length(); j++) {
3367 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3368 }
3369 }
3370
3371 if (cached_class_file_bytes != NULL) {
3372 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3373 this_klass->set_cached_class_file(cached_class_file_bytes,
3374 cached_class_file_length);
3375 }
3376
3377 // Miranda methods
3378 if ((num_miranda_methods > 0) ||
3379 // if this class introduced new miranda methods or
3380 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3381 // super class exists and this class inherited miranda methods
3382 ) {
3383 this_klass->set_has_miranda_methods(); // then set a flag
3384 }
3385
3386 // Additional attributes
3387 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3388
3389 // Make sure this is the end of class file stream
3390 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3391
3392 // VerifyOops believes that once this has been set, the object is completely loaded.
3393 // Compute transitive closure of interfaces this class implements
3394 this_klass->set_transitive_interfaces(transitive_interfaces());
3395
3396 // Fill in information needed to compute superclasses.
3397 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3398
3399 // Initialize itable offset tables
3400 klassItable::setup_itable_offset_table(this_klass);
3401
3402 // Do final class setup
3403 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3404
3405 set_precomputed_flags(this_klass);
3406
3407 // reinitialize modifiers, using the InnerClasses attribute
3408 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3409 this_klass->set_modifier_flags(computed_modifiers);
3410
3411 // check if this class can access its super class
3412 check_super_class_access(this_klass, CHECK_(nullHandle));
3413
3414 // check if this class can access its superinterfaces
3415 check_super_interface_access(this_klass, CHECK_(nullHandle));
3416
3417 // check if this class overrides any final method
3418 check_final_method_override(this_klass, CHECK_(nullHandle));
3419
3420 // check that if this class is an interface then it doesn't have static methods
3421 if (this_klass->is_interface()) {
3422 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3423 }
3424
3425 // Allocate mirror and initialize static fields
3426 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3427
3428 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3429 false /* not shared class */);
3430
3431 if (TraceClassLoading) {
3432 // print in a single call to reduce interleaving of output
3433 if (cfs->source() != NULL) {
3434 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3435 cfs->source());
3436 } else if (class_loader.is_null()) {
3437 if (THREAD->is_Java_thread()) {
3438 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3439 tty->print("[Loaded %s by instance of %s]\n",
3440 this_klass->external_name(),
3441 instanceKlass::cast(caller)->external_name());
3442 } else {
3443 tty->print("[Loaded %s]\n", this_klass->external_name());
3444 }
3445 } else {
3446 ResourceMark rm;
3447 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3448 instanceKlass::cast(class_loader->klass())->external_name());
3449 }
3450 }
3451
3452 if (TraceClassResolution) {
3453 // print out the superclass.
3454 const char * from = Klass::cast(this_klass())->external_name();
3455 if (this_klass->java_super() != NULL) {
3456 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3457 }
3458 // print out each of the interface classes referred to by this class.
3459 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3460 if (!local_interfaces.is_null()) {
3461 int length = local_interfaces->length();
3462 for (int i = 0; i < length; i++) {
3463 klassOop k = klassOop(local_interfaces->obj_at(i));
3464 instanceKlass* to_class = instanceKlass::cast(k);
3465 const char * to = to_class->external_name();
3466 tty->print("RESOLVE %s %s (interface)\n", from, to);
3467 }
3468 }
3469 }
3470
3471 #ifndef PRODUCT
3472 if( PrintCompactFieldsSavings ) {
3473 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3474 tty->print("[Saved %d of %d bytes in %s]\n",
3475 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3476 orig_nonstatic_field_size*heapOopSize,
3477 this_klass->external_name());
3478 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3479 tty->print("[Wasted %d over %d bytes in %s]\n",
3480 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3481 orig_nonstatic_field_size*heapOopSize,
3482 this_klass->external_name());
3483 }
3484 }
3485 #endif
3486
3487 // preserve result across HandleMark
3488 preserve_this_klass = this_klass();
3489 }
3490
3491 // Create new handle outside HandleMark
3492 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3493 debug_only(this_klass->as_klassOop()->verify();)
3494
3495 return this_klass;
3496 }
3497
3498
3499 unsigned int
3500 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3501 unsigned int nonstatic_oop_map_count,
3502 int first_nonstatic_oop_offset) {
3503 unsigned int map_count =
3504 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3505 if (nonstatic_oop_map_count > 0) {
3506 // We have oops to add to map
3507 if (map_count == 0) {
3508 map_count = nonstatic_oop_map_count;
3509 } else {
3510 // Check whether we should add a new map block or whether the last one can
3511 // be extended
3512 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3513 OopMapBlock* const last_map = first_map + map_count - 1;
3514
3515 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3516 if (next_offset == first_nonstatic_oop_offset) {
3517 // There is no gap bettwen superklass's last oop field and first
3518 // local oop field, merge maps.
3519 nonstatic_oop_map_count -= 1;
3520 } else {
3521 // Superklass didn't end with a oop field, add extra maps
3522 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3523 }
3524 map_count += nonstatic_oop_map_count;
3525 }
3526 }
3527 return map_count;
3528 }
3529
3530
3531 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3532 unsigned int nonstatic_oop_map_count,
3533 int* nonstatic_oop_offsets,
3534 unsigned int* nonstatic_oop_counts) {
3535 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3536 const instanceKlass* const super = k->superklass();
3537 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3538 if (super_count > 0) {
3539 // Copy maps from superklass
3540 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3541 for (unsigned int i = 0; i < super_count; ++i) {
3542 *this_oop_map++ = *super_oop_map++;
3543 }
3544 }
3545
3546 if (nonstatic_oop_map_count > 0) {
3547 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3548 // The counts differ because there is no gap between superklass's last oop
3549 // field and the first local oop field. Extend the last oop map copied
3550 // from the superklass instead of creating new one.
3551 nonstatic_oop_map_count--;
3552 nonstatic_oop_offsets++;
3553 this_oop_map--;
3554 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3555 this_oop_map++;
3556 }
3557
3558 // Add new map blocks, fill them
3559 while (nonstatic_oop_map_count-- > 0) {
3560 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3561 this_oop_map->set_count(*nonstatic_oop_counts++);
3562 this_oop_map++;
3563 }
3564 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3565 this_oop_map, "sanity");
3566 }
3567 }
3568
3569
3570 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3571 klassOop super = k->super();
3572
3573 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3574 // in which case we don't have to register objects as finalizable
3575 if (!_has_empty_finalizer) {
3576 if (_has_finalizer ||
3577 (super != NULL && super->klass_part()->has_finalizer())) {
3578 k->set_has_finalizer();
3579 }
3580 }
3581
3582 #ifdef ASSERT
3583 bool f = false;
3584 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3585 vmSymbols::void_method_signature());
3586 if (m != NULL && !m->is_empty_method()) {
3587 f = true;
3588 }
3589 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3590 #endif
3591
3592 // Check if this klass supports the java.lang.Cloneable interface
3593 if (SystemDictionary::Cloneable_klass_loaded()) {
3594 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3595 k->set_is_cloneable();
3596 }
3597 }
3598
3599 // Check if this klass has a vanilla default constructor
3600 if (super == NULL) {
3601 // java.lang.Object has empty default constructor
3602 k->set_has_vanilla_constructor();
3603 } else {
3604 if (Klass::cast(super)->has_vanilla_constructor() &&
3605 _has_vanilla_constructor) {
3606 k->set_has_vanilla_constructor();
3607 }
3608 #ifdef ASSERT
3609 bool v = false;
3610 if (Klass::cast(super)->has_vanilla_constructor()) {
3611 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3612 ), vmSymbols::void_method_signature());
3613 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3614 v = true;
3615 }
3616 }
3617 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3618 #endif
3619 }
3620
3621 // If it cannot be fast-path allocated, set a bit in the layout helper.
3622 // See documentation of instanceKlass::can_be_fastpath_allocated().
3623 assert(k->size_helper() > 0, "layout_helper is initialized");
3624 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3625 || k->is_abstract() || k->is_interface()
3626 || (k->name() == vmSymbols::java_lang_Class()
3627 && k->class_loader() == NULL)
3628 || k->size_helper() >= FastAllocateSizeLimit) {
3629 // Forbid fast-path allocation.
3630 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3631 k->set_layout_helper(lh);
3632 }
3633 }
3634
3635
3636 // utility method for appending and array with check for duplicates
3637
3638 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3639 // iterate over new interfaces
3640 for (int i = 0; i < ifs->length(); i++) {
3641 oop e = ifs->obj_at(i);
3642 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3643 // check for duplicates
3644 bool duplicate = false;
3645 for (int j = 0; j < index; j++) {
3646 if (result->obj_at(j) == e) {
3647 duplicate = true;
3648 break;
3649 }
3650 }
3651 // add new interface
3652 if (!duplicate) {
3653 result->obj_at_put(index++, e);
3654 }
3655 }
3656 }
3657
3658 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3659 // Compute maximum size for transitive interfaces
3660 int max_transitive_size = 0;
3661 int super_size = 0;
3662 // Add superclass transitive interfaces size
3663 if (super.not_null()) {
3664 super_size = super->transitive_interfaces()->length();
3665 max_transitive_size += super_size;
3666 }
3667 // Add local interfaces' super interfaces
3668 int local_size = local_ifs->length();
3669 for (int i = 0; i < local_size; i++) {
3670 klassOop l = klassOop(local_ifs->obj_at(i));
3671 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3672 }
3673 // Finally add local interfaces
3674 max_transitive_size += local_size;
3675 // Construct array
3676 objArrayHandle result;
3677 if (max_transitive_size == 0) {
3678 // no interfaces, use canonicalized array
3679 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3680 } else if (max_transitive_size == super_size) {
3681 // no new local interfaces added, share superklass' transitive interface array
3682 result = objArrayHandle(THREAD, super->transitive_interfaces());
3683 } else if (max_transitive_size == local_size) {
3684 // only local interfaces added, share local interface array
3685 result = local_ifs;
3686 } else {
3687 objArrayHandle nullHandle;
3688 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3689 result = objArrayHandle(THREAD, new_objarray);
3690 int index = 0;
3691 // Copy down from superclass
3692 if (super.not_null()) {
3693 append_interfaces(result, index, super->transitive_interfaces());
3694 }
3695 // Copy down from local interfaces' superinterfaces
3696 for (int i = 0; i < local_ifs->length(); i++) {
3697 klassOop l = klassOop(local_ifs->obj_at(i));
3698 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3699 }
3700 // Finally add local interfaces
3701 append_interfaces(result, index, local_ifs());
3702
3703 // Check if duplicates were removed
3704 if (index != max_transitive_size) {
3705 assert(index < max_transitive_size, "just checking");
3706 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3707 for (int i = 0; i < index; i++) {
3708 oop e = result->obj_at(i);
3709 assert(e != NULL, "just checking");
3710 new_result->obj_at_put(i, e);
3711 }
3712 result = objArrayHandle(THREAD, new_result);
3713 }
3714 }
3715 return result;
3716 }
3717
3718
3719 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3720 klassOop super = this_klass->super();
3721 if ((super != NULL) &&
3722 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3723 ResourceMark rm(THREAD);
3724 Exceptions::fthrow(
3725 THREAD_AND_LOCATION,
3726 vmSymbols::java_lang_IllegalAccessError(),
3727 "class %s cannot access its superclass %s",
3728 this_klass->external_name(),
3729 instanceKlass::cast(super)->external_name()
3730 );
3731 return;
3732 }
3733 }
3734
3735
3736 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3737 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3738 int lng = local_interfaces->length();
3739 for (int i = lng - 1; i >= 0; i--) {
3740 klassOop k = klassOop(local_interfaces->obj_at(i));
3741 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3742 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3743 ResourceMark rm(THREAD);
3744 Exceptions::fthrow(
3745 THREAD_AND_LOCATION,
3746 vmSymbols::java_lang_IllegalAccessError(),
3747 "class %s cannot access its superinterface %s",
3748 this_klass->external_name(),
3749 instanceKlass::cast(k)->external_name()
3750 );
3751 return;
3752 }
3753 }
3754 }
3755
3756
3757 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3758 objArrayHandle methods (THREAD, this_klass->methods());
3759 int num_methods = methods->length();
3760
3761 // go thru each method and check if it overrides a final method
3762 for (int index = 0; index < num_methods; index++) {
3763 methodOop m = (methodOop)methods->obj_at(index);
3764
3765 // skip private, static and <init> methods
3766 if ((!m->is_private()) &&
3767 (!m->is_static()) &&
3768 (m->name() != vmSymbols::object_initializer_name())) {
3769
3770 Symbol* name = m->name();
3771 Symbol* signature = m->signature();
3772 klassOop k = this_klass->super();
3773 methodOop super_m = NULL;
3774 while (k != NULL) {
3775 // skip supers that don't have final methods.
3776 if (k->klass_part()->has_final_method()) {
3777 // lookup a matching method in the super class hierarchy
3778 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3779 if (super_m == NULL) {
3780 break; // didn't find any match; get out
3781 }
3782
3783 if (super_m->is_final() &&
3784 // matching method in super is final
3785 (Reflection::verify_field_access(this_klass->as_klassOop(),
3786 super_m->method_holder(),
3787 super_m->method_holder(),
3788 super_m->access_flags(), false))
3789 // this class can access super final method and therefore override
3790 ) {
3791 ResourceMark rm(THREAD);
3792 Exceptions::fthrow(
3793 THREAD_AND_LOCATION,
3794 vmSymbols::java_lang_VerifyError(),
3795 "class %s overrides final method %s.%s",
3796 this_klass->external_name(),
3797 name->as_C_string(),
3798 signature->as_C_string()
3799 );
3800 return;
3801 }
3802
3803 // continue to look from super_m's holder's super.
3804 k = instanceKlass::cast(super_m->method_holder())->super();
3805 continue;
3806 }
3807
3808 k = k->klass_part()->super();
3809 }
3810 }
3811 }
3812 }
3813
3814
3815 // assumes that this_klass is an interface
3816 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3817 assert(this_klass->is_interface(), "not an interface");
3818 objArrayHandle methods (THREAD, this_klass->methods());
3819 int num_methods = methods->length();
3820
3821 for (int index = 0; index < num_methods; index++) {
3822 methodOop m = (methodOop)methods->obj_at(index);
3823 // if m is static and not the init method, throw a verify error
3824 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3825 ResourceMark rm(THREAD);
3826 Exceptions::fthrow(
3827 THREAD_AND_LOCATION,
3828 vmSymbols::java_lang_VerifyError(),
3829 "Illegal static method %s in interface %s",
3830 m->name()->as_C_string(),
3831 this_klass->external_name()
3832 );
3833 return;
3834 }
3835 }
3836 }
3837
3838 // utility methods for format checking
3839
3840 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3841 if (!_need_verify) { return; }
3842
3843 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3844 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3845 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3846 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3847 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3848 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3849 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3850
3851 if ((is_abstract && is_final) ||
3852 (is_interface && !is_abstract) ||
3853 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3854 (!is_interface && major_gte_15 && is_annotation)) {
3855 ResourceMark rm(THREAD);
3856 Exceptions::fthrow(
3857 THREAD_AND_LOCATION,
3858 vmSymbols::java_lang_ClassFormatError(),
3859 "Illegal class modifiers in class %s: 0x%X",
3860 _class_name->as_C_string(), flags
3861 );
3862 return;
3863 }
3864 }
3865
3866 bool ClassFileParser::has_illegal_visibility(jint flags) {
3867 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3868 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3869 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3870
3871 return ((is_public && is_protected) ||
3872 (is_public && is_private) ||
3873 (is_protected && is_private));
3874 }
3875
3876 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3877 u2 max_version =
3878 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3879 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3880 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3881 (major <= max_version) &&
3882 ((major != max_version) ||
3883 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3884 }
3885
3886 void ClassFileParser::verify_legal_field_modifiers(
3887 jint flags, bool is_interface, TRAPS) {
3888 if (!_need_verify) { return; }
3889
3890 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3891 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3892 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3893 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3894 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3895 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3896 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3897 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3898 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3899
3900 bool is_illegal = false;
3901
3902 if (is_interface) {
3903 if (!is_public || !is_static || !is_final || is_private ||
3904 is_protected || is_volatile || is_transient ||
3905 (major_gte_15 && is_enum)) {
3906 is_illegal = true;
3907 }
3908 } else { // not interface
3909 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3910 is_illegal = true;
3911 }
3912 }
3913
3914 if (is_illegal) {
3915 ResourceMark rm(THREAD);
3916 Exceptions::fthrow(
3917 THREAD_AND_LOCATION,
3918 vmSymbols::java_lang_ClassFormatError(),
3919 "Illegal field modifiers in class %s: 0x%X",
3920 _class_name->as_C_string(), flags);
3921 return;
3922 }
3923 }
3924
3925 void ClassFileParser::verify_legal_method_modifiers(
3926 jint flags, bool is_interface, Symbol* name, TRAPS) {
3927 if (!_need_verify) { return; }
3928
3929 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3930 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3931 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3932 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3933 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3934 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3935 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3936 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3937 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3938 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3939 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3940
3941 bool is_illegal = false;
3942
3943 if (is_interface) {
3944 if (!is_abstract || !is_public || is_static || is_final ||
3945 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3946 is_illegal = true;
3947 }
3948 } else { // not interface
3949 if (is_initializer) {
3950 if (is_static || is_final || is_synchronized || is_native ||
3951 is_abstract || (major_gte_15 && is_bridge)) {
3952 is_illegal = true;
3953 }
3954 } else { // not initializer
3955 if (is_abstract) {
3956 if ((is_final || is_native || is_private || is_static ||
3957 (major_gte_15 && (is_synchronized || is_strict)))) {
3958 is_illegal = true;
3959 }
3960 }
3961 if (has_illegal_visibility(flags)) {
3962 is_illegal = true;
3963 }
3964 }
3965 }
3966
3967 if (is_illegal) {
3968 ResourceMark rm(THREAD);
3969 Exceptions::fthrow(
3970 THREAD_AND_LOCATION,
3971 vmSymbols::java_lang_ClassFormatError(),
3972 "Method %s in class %s has illegal modifiers: 0x%X",
3973 name->as_C_string(), _class_name->as_C_string(), flags);
3974 return;
3975 }
3976 }
3977
3978 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3979 assert(_need_verify, "only called when _need_verify is true");
3980 int i = 0;
3981 int count = length >> 2;
3982 for (int k=0; k<count; k++) {
3983 unsigned char b0 = buffer[i];
3984 unsigned char b1 = buffer[i+1];
3985 unsigned char b2 = buffer[i+2];
3986 unsigned char b3 = buffer[i+3];
3987 // For an unsigned char v,
3988 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3989 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3990 unsigned char res = b0 | b0 - 1 |
3991 b1 | b1 - 1 |
3992 b2 | b2 - 1 |
3993 b3 | b3 - 1;
3994 if (res >= 128) break;
3995 i += 4;
3996 }
3997 for(; i < length; i++) {
3998 unsigned short c;
3999 // no embedded zeros
4000 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4001 if(buffer[i] < 128) {
4002 continue;
4003 }
4004 if ((i + 5) < length) { // see if it's legal supplementary character
4005 if (UTF8::is_supplementary_character(&buffer[i])) {
4006 c = UTF8::get_supplementary_character(&buffer[i]);
4007 i += 5;
4008 continue;
4009 }
4010 }
4011 switch (buffer[i] >> 4) {
4012 default: break;
4013 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4014 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4015 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4016 c = (buffer[i] & 0x1F) << 6;
4017 i++;
4018 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4019 c += buffer[i] & 0x3F;
4020 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4021 // for classes with major > 47, c must a null or a character in its shortest form
4022 break;
4023 }
4024 }
4025 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4026 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4027 c = (buffer[i] & 0xF) << 12;
4028 i += 2;
4029 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4030 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4031 if (_major_version <= 47 || c >= 0x800) {
4032 // for classes with major > 47, c must be in its shortest form
4033 break;
4034 }
4035 }
4036 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4037 } // end of switch
4038 } // end of for
4039 }
4040
4041 // Checks if name is a legal class name.
4042 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4043 if (!_need_verify || _relax_verify) { return; }
4044
4045 char buf[fixed_buffer_size];
4046 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4047 unsigned int length = name->utf8_length();
4048 bool legal = false;
4049
4050 if (length > 0) {
4051 char* p;
4052 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4053 p = skip_over_field_signature(bytes, false, length, CHECK);
4054 legal = (p != NULL) && ((p - bytes) == (int)length);
4055 } else if (_major_version < JAVA_1_5_VERSION) {
4056 if (bytes[0] != '<') {
4057 p = skip_over_field_name(bytes, true, length);
4058 legal = (p != NULL) && ((p - bytes) == (int)length);
4059 }
4060 } else {
4061 // 4900761: relax the constraints based on JSR202 spec
4062 // Class names may be drawn from the entire Unicode character set.
4063 // Identifiers between '/' must be unqualified names.
4064 // The utf8 string has been verified when parsing cpool entries.
4065 legal = verify_unqualified_name(bytes, length, LegalClass);
4066 }
4067 }
4068 if (!legal) {
4069 ResourceMark rm(THREAD);
4070 Exceptions::fthrow(
4071 THREAD_AND_LOCATION,
4072 vmSymbols::java_lang_ClassFormatError(),
4073 "Illegal class name \"%s\" in class file %s", bytes,
4074 _class_name->as_C_string()
4075 );
4076 return;
4077 }
4078 }
4079
4080 // Checks if name is a legal field name.
4081 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4082 if (!_need_verify || _relax_verify) { return; }
4083
4084 char buf[fixed_buffer_size];
4085 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4086 unsigned int length = name->utf8_length();
4087 bool legal = false;
4088
4089 if (length > 0) {
4090 if (_major_version < JAVA_1_5_VERSION) {
4091 if (bytes[0] != '<') {
4092 char* p = skip_over_field_name(bytes, false, length);
4093 legal = (p != NULL) && ((p - bytes) == (int)length);
4094 }
4095 } else {
4096 // 4881221: relax the constraints based on JSR202 spec
4097 legal = verify_unqualified_name(bytes, length, LegalField);
4098 }
4099 }
4100
4101 if (!legal) {
4102 ResourceMark rm(THREAD);
4103 Exceptions::fthrow(
4104 THREAD_AND_LOCATION,
4105 vmSymbols::java_lang_ClassFormatError(),
4106 "Illegal field name \"%s\" in class %s", bytes,
4107 _class_name->as_C_string()
4108 );
4109 return;
4110 }
4111 }
4112
4113 // Checks if name is a legal method name.
4114 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4115 if (!_need_verify || _relax_verify) { return; }
4116
4117 assert(name != NULL, "method name is null");
4118 char buf[fixed_buffer_size];
4119 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4120 unsigned int length = name->utf8_length();
4121 bool legal = false;
4122
4123 if (length > 0) {
4124 if (bytes[0] == '<') {
4125 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4126 legal = true;
4127 }
4128 } else if (_major_version < JAVA_1_5_VERSION) {
4129 char* p;
4130 p = skip_over_field_name(bytes, false, length);
4131 legal = (p != NULL) && ((p - bytes) == (int)length);
4132 } else {
4133 // 4881221: relax the constraints based on JSR202 spec
4134 legal = verify_unqualified_name(bytes, length, LegalMethod);
4135 }
4136 }
4137
4138 if (!legal) {
4139 ResourceMark rm(THREAD);
4140 Exceptions::fthrow(
4141 THREAD_AND_LOCATION,
4142 vmSymbols::java_lang_ClassFormatError(),
4143 "Illegal method name \"%s\" in class %s", bytes,
4144 _class_name->as_C_string()
4145 );
4146 return;
4147 }
4148 }
4149
4150
4151 // Checks if signature is a legal field signature.
4152 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4153 if (!_need_verify) { return; }
4154
4155 char buf[fixed_buffer_size];
4156 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4157 unsigned int length = signature->utf8_length();
4158 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4159
4160 if (p == NULL || (p - bytes) != (int)length) {
4161 throwIllegalSignature("Field", name, signature, CHECK);
4162 }
4163 }
4164
4165 // Checks if signature is a legal method signature.
4166 // Returns number of parameters
4167 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4168 if (!_need_verify) {
4169 // make sure caller's args_size will be less than 0 even for non-static
4170 // method so it will be recomputed in compute_size_of_parameters().
4171 return -2;
4172 }
4173
4174 unsigned int args_size = 0;
4175 char buf[fixed_buffer_size];
4176 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4177 unsigned int length = signature->utf8_length();
4178 char* nextp;
4179
4180 // The first character must be a '('
4181 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4182 length--;
4183 // Skip over legal field signatures
4184 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4185 while ((length > 0) && (nextp != NULL)) {
4186 args_size++;
4187 if (p[0] == 'J' || p[0] == 'D') {
4188 args_size++;
4189 }
4190 length -= nextp - p;
4191 p = nextp;
4192 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4193 }
4194 // The first non-signature thing better be a ')'
4195 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4196 length--;
4197 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4198 // All internal methods must return void
4199 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4200 return args_size;
4201 }
4202 } else {
4203 // Now we better just have a return value
4204 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4205 if (nextp && ((int)length == (nextp - p))) {
4206 return args_size;
4207 }
4208 }
4209 }
4210 }
4211 // Report error
4212 throwIllegalSignature("Method", name, signature, CHECK_0);
4213 return 0;
4214 }
4215
4216
4217 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4218 // Method names also may not contain the characters '<' or '>', unless <init>
4219 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4220 // method. Because these names have been checked as special cases before
4221 // calling this method in verify_legal_method_name.
4222 bool ClassFileParser::verify_unqualified_name(
4223 char* name, unsigned int length, int type) {
4224 jchar ch;
4225
4226 for (char* p = name; p != name + length; ) {
4227 ch = *p;
4228 if (ch < 128) {
4229 p++;
4230 if (ch == '.' || ch == ';' || ch == '[' ) {
4231 return false; // do not permit '.', ';', or '['
4232 }
4233 if (type != LegalClass && ch == '/') {
4234 return false; // do not permit '/' unless it's class name
4235 }
4236 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4237 return false; // do not permit '<' or '>' in method names
4238 }
4239 } else {
4240 char* tmp_p = UTF8::next(p, &ch);
4241 p = tmp_p;
4242 }
4243 }
4244 return true;
4245 }
4246
4247
4248 // Take pointer to a string. Skip over the longest part of the string that could
4249 // be taken as a fieldname. Allow '/' if slash_ok is true.
4250 // Return a pointer to just past the fieldname.
4251 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4252 // being true, we saw consecutive slashes (meaning we were looking for a
4253 // qualified path but found something that was badly-formed).
4254 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4255 char* p;
4256 jchar ch;
4257 jboolean last_is_slash = false;
4258 jboolean not_first_ch = false;
4259
4260 for (p = name; p != name + length; not_first_ch = true) {
4261 char* old_p = p;
4262 ch = *p;
4263 if (ch < 128) {
4264 p++;
4265 // quick check for ascii
4266 if ((ch >= 'a' && ch <= 'z') ||
4267 (ch >= 'A' && ch <= 'Z') ||
4268 (ch == '_' || ch == '$') ||
4269 (not_first_ch && ch >= '0' && ch <= '9')) {
4270 last_is_slash = false;
4271 continue;
4272 }
4273 if (slash_ok && ch == '/') {
4274 if (last_is_slash) {
4275 return NULL; // Don't permit consecutive slashes
4276 }
4277 last_is_slash = true;
4278 continue;
4279 }
4280 } else {
4281 jint unicode_ch;
4282 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4283 p = tmp_p;
4284 last_is_slash = false;
4285 // Check if ch is Java identifier start or is Java identifier part
4286 // 4672820: call java.lang.Character methods directly without generating separate tables.
4287 EXCEPTION_MARK;
4288 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4289
4290 // return value
4291 JavaValue result(T_BOOLEAN);
4292 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4293 JavaCallArguments args;
4294 args.push_int(unicode_ch);
4295
4296 // public static boolean isJavaIdentifierStart(char ch);
4297 JavaCalls::call_static(&result,
4298 klass,
4299 vmSymbols::isJavaIdentifierStart_name(),
4300 vmSymbols::int_bool_signature(),
4301 &args,
4302 THREAD);
4303
4304 if (HAS_PENDING_EXCEPTION) {
4305 CLEAR_PENDING_EXCEPTION;
4306 return 0;
4307 }
4308 if (result.get_jboolean()) {
4309 continue;
4310 }
4311
4312 if (not_first_ch) {
4313 // public static boolean isJavaIdentifierPart(char ch);
4314 JavaCalls::call_static(&result,
4315 klass,
4316 vmSymbols::isJavaIdentifierPart_name(),
4317 vmSymbols::int_bool_signature(),
4318 &args,
4319 THREAD);
4320
4321 if (HAS_PENDING_EXCEPTION) {
4322 CLEAR_PENDING_EXCEPTION;
4323 return 0;
4324 }
4325
4326 if (result.get_jboolean()) {
4327 continue;
4328 }
4329 }
4330 }
4331 return (not_first_ch) ? old_p : NULL;
4332 }
4333 return (not_first_ch) ? p : NULL;
4334 }
4335
4336
4337 // Take pointer to a string. Skip over the longest part of the string that could
4338 // be taken as a field signature. Allow "void" if void_ok.
4339 // Return a pointer to just past the signature.
4340 // Return NULL if no legal signature is found.
4341 char* ClassFileParser::skip_over_field_signature(char* signature,
4342 bool void_ok,
4343 unsigned int length,
4344 TRAPS) {
4345 unsigned int array_dim = 0;
4346 while (length > 0) {
4347 switch (signature[0]) {
4348 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4349 case JVM_SIGNATURE_BOOLEAN:
4350 case JVM_SIGNATURE_BYTE:
4351 case JVM_SIGNATURE_CHAR:
4352 case JVM_SIGNATURE_SHORT:
4353 case JVM_SIGNATURE_INT:
4354 case JVM_SIGNATURE_FLOAT:
4355 case JVM_SIGNATURE_LONG:
4356 case JVM_SIGNATURE_DOUBLE:
4357 return signature + 1;
4358 case JVM_SIGNATURE_CLASS: {
4359 if (_major_version < JAVA_1_5_VERSION) {
4360 // Skip over the class name if one is there
4361 char* p = skip_over_field_name(signature + 1, true, --length);
4362
4363 // The next character better be a semicolon
4364 if (p && (p - signature) > 1 && p[0] == ';') {
4365 return p + 1;
4366 }
4367 } else {
4368 // 4900761: For class version > 48, any unicode is allowed in class name.
4369 length--;
4370 signature++;
4371 while (length > 0 && signature[0] != ';') {
4372 if (signature[0] == '.') {
4373 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4374 }
4375 length--;
4376 signature++;
4377 }
4378 if (signature[0] == ';') { return signature + 1; }
4379 }
4380
4381 return NULL;
4382 }
4383 case JVM_SIGNATURE_ARRAY:
4384 array_dim++;
4385 if (array_dim > 255) {
4386 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4387 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4388 }
4389 // The rest of what's there better be a legal signature
4390 signature++;
4391 length--;
4392 void_ok = false;
4393 break;
4394
4395 default:
4396 return NULL;
4397 }
4398 }
4399 return NULL;
4400 }