1 /*
2 * Copyright (c) 1997, 2013, 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/classLoaderData.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/genericSignatures.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/verificationType.hpp"
36 #include "classfile/verifier.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "memory/allocation.hpp"
39 #include "memory/gcLocker.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/instanceMirrorKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/klassVtable.hpp"
49 #include "oops/method.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm.h"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/perfData.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/classLoadingService.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/array.hpp"
62 #include "utilities/globalDefinitions.hpp"
63
64 // We generally try to create the oops directly when parsing, rather than
65 // allocating temporary data structures and copying the bytes twice. A
66 // temporary area is only needed when parsing utf8 entries in the constant
67 // pool and when parsing line number tables.
68
69 // We add assert in debug mode when class format is not checked.
70
71 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
72 #define JAVA_MIN_SUPPORTED_VERSION 45
73 #define JAVA_MAX_SUPPORTED_VERSION 52
74 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
75
76 // Used for two backward compatibility reasons:
77 // - to check for new additions to the class file format in JDK1.5
78 // - to check for bug fixes in the format checker in JDK1.5
79 #define JAVA_1_5_VERSION 49
80
81 // Used for backward compatibility reasons:
82 // - to check for javac bug fixes that happened after 1.5
83 // - also used as the max version when running in jdk6
84 #define JAVA_6_VERSION 50
85
86 // Used for backward compatibility reasons:
87 // - to check NameAndType_info signatures more aggressively
88 #define JAVA_7_VERSION 51
89
90 // Extension method support.
91 #define JAVA_8_VERSION 52
92
93 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
94 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
95 // this function (_current can be allocated in a register, with scalar
96 // replacement of aggregates). The _current pointer is copied back to
97 // stream() when this function returns. DON'T call another method within
98 // this method that uses stream().
99 ClassFileStream* cfs0 = stream();
100 ClassFileStream cfs1 = *cfs0;
101 ClassFileStream* cfs = &cfs1;
102 #ifdef ASSERT
103 assert(cfs->allocated_on_stack(),"should be local");
104 u1* old_current = cfs0->current();
105 #endif
106 Handle class_loader(THREAD, _loader_data->class_loader());
107
108 // Used for batching symbol allocations.
109 const char* names[SymbolTable::symbol_alloc_batch_size];
110 int lengths[SymbolTable::symbol_alloc_batch_size];
111 int indices[SymbolTable::symbol_alloc_batch_size];
112 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
113 int names_count = 0;
114
115 // parsing Index 0 is unused
116 for (int index = 1; index < length; index++) {
117 // Each of the following case guarantees one more byte in the stream
118 // for the following tag or the access_flags following constant pool,
119 // so we don't need bounds-check for reading tag.
120 u1 tag = cfs->get_u1_fast();
121 switch (tag) {
122 case JVM_CONSTANT_Class :
123 {
124 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
125 u2 name_index = cfs->get_u2_fast();
126 _cp->klass_index_at_put(index, name_index);
127 }
128 break;
129 case JVM_CONSTANT_Fieldref :
130 {
131 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
132 u2 class_index = cfs->get_u2_fast();
133 u2 name_and_type_index = cfs->get_u2_fast();
134 _cp->field_at_put(index, class_index, name_and_type_index);
135 }
136 break;
137 case JVM_CONSTANT_Methodref :
138 {
139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
140 u2 class_index = cfs->get_u2_fast();
141 u2 name_and_type_index = cfs->get_u2_fast();
142 _cp->method_at_put(index, class_index, name_and_type_index);
143 }
144 break;
145 case JVM_CONSTANT_InterfaceMethodref :
146 {
147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
148 u2 class_index = cfs->get_u2_fast();
149 u2 name_and_type_index = cfs->get_u2_fast();
150 _cp->interface_method_at_put(index, class_index, name_and_type_index);
151 }
152 break;
153 case JVM_CONSTANT_String :
154 {
155 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
156 u2 string_index = cfs->get_u2_fast();
157 _cp->string_index_at_put(index, string_index);
158 }
159 break;
160 case JVM_CONSTANT_MethodHandle :
161 case JVM_CONSTANT_MethodType :
162 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
163 classfile_parse_error(
164 "Class file version does not support constant tag %u in class file %s",
165 tag, CHECK);
166 }
167 if (!EnableInvokeDynamic) {
168 classfile_parse_error(
169 "This JVM does not support constant tag %u in class file %s",
170 tag, CHECK);
171 }
172 if (tag == JVM_CONSTANT_MethodHandle) {
173 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
174 u1 ref_kind = cfs->get_u1_fast();
175 u2 method_index = cfs->get_u2_fast();
176 _cp->method_handle_index_at_put(index, ref_kind, method_index);
177 } else if (tag == JVM_CONSTANT_MethodType) {
178 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
179 u2 signature_index = cfs->get_u2_fast();
180 _cp->method_type_index_at_put(index, signature_index);
181 } else {
182 ShouldNotReachHere();
183 }
184 break;
185 case JVM_CONSTANT_InvokeDynamic :
186 {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (!EnableInvokeDynamic) {
193 classfile_parse_error(
194 "This JVM does not support constant tag %u in class file %s",
195 tag, CHECK);
196 }
197 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
198 u2 bootstrap_specifier_index = cfs->get_u2_fast();
199 u2 name_and_type_index = cfs->get_u2_fast();
200 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
201 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
202 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
203 }
204 break;
205 case JVM_CONSTANT_Integer :
206 {
207 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
208 u4 bytes = cfs->get_u4_fast();
209 _cp->int_at_put(index, (jint) bytes);
210 }
211 break;
212 case JVM_CONSTANT_Float :
213 {
214 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
215 u4 bytes = cfs->get_u4_fast();
216 _cp->float_at_put(index, *(jfloat*)&bytes);
217 }
218 break;
219 case JVM_CONSTANT_Long :
220 // A mangled type might cause you to overrun allocated memory
221 guarantee_property(index+1 < length,
222 "Invalid constant pool entry %u in class file %s",
223 index, CHECK);
224 {
225 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
226 u8 bytes = cfs->get_u8_fast();
227 _cp->long_at_put(index, bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_Double :
232 // A mangled type might cause you to overrun allocated memory
233 guarantee_property(index+1 < length,
234 "Invalid constant pool entry %u in class file %s",
235 index, CHECK);
236 {
237 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
238 u8 bytes = cfs->get_u8_fast();
239 _cp->double_at_put(index, *(jdouble*)&bytes);
240 }
241 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
242 break;
243 case JVM_CONSTANT_NameAndType :
244 {
245 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
246 u2 name_index = cfs->get_u2_fast();
247 u2 signature_index = cfs->get_u2_fast();
248 _cp->name_and_type_at_put(index, name_index, signature_index);
249 }
250 break;
251 case JVM_CONSTANT_Utf8 :
252 {
253 cfs->guarantee_more(2, CHECK); // utf8_length
254 u2 utf8_length = cfs->get_u2_fast();
255 u1* utf8_buffer = cfs->get_u1_buffer();
256 assert(utf8_buffer != NULL, "null utf8 buffer");
257 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
258 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
259 cfs->skip_u1_fast(utf8_length);
260
261 // Before storing the symbol, make sure it's legal
262 if (_need_verify) {
263 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
264 }
265
266 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
267 Handle patch = clear_cp_patch_at(index);
268 guarantee_property(java_lang_String::is_instance(patch()),
269 "Illegal utf8 patch at %d in class file %s",
270 index, CHECK);
271 char* str = java_lang_String::as_utf8_string(patch());
272 // (could use java_lang_String::as_symbol instead, but might as well batch them)
273 utf8_buffer = (u1*) str;
274 utf8_length = (int) strlen(str);
275 }
276
277 unsigned int hash;
278 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
279 if (result == NULL) {
280 names[names_count] = (char*)utf8_buffer;
281 lengths[names_count] = utf8_length;
282 indices[names_count] = index;
283 hashValues[names_count++] = hash;
284 if (names_count == SymbolTable::symbol_alloc_batch_size) {
285 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
286 names_count = 0;
287 }
288 } else {
289 _cp->symbol_at_put(index, result);
290 }
291 }
292 break;
293 default:
294 classfile_parse_error(
295 "Unknown constant tag %u in class file %s", tag, CHECK);
296 break;
297 }
298 }
299
300 // Allocate the remaining symbols
301 if (names_count > 0) {
302 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
303 }
304
305 // Copy _current pointer of local copy back to stream().
306 #ifdef ASSERT
307 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
308 #endif
309 cfs0->set_current(cfs1.current());
310 }
311
312 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
313
314 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
315 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
316 return cp->symbol_at(index);
317 else
318 return NULL;
319 }
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 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
331 CHECK_(nullHandle));
332 _cp = constant_pool; // save in case of errors
333 constantPoolHandle cp (THREAD, constant_pool);
334
335 // parsing constant pool entries
336 parse_constant_pool_entries(length, CHECK_(nullHandle));
337
338 int index = 1; // declared outside of loops for portability
339
340 // first verification pass - validate cross references and fixup class and string constants
341 for (index = 1; index < length; index++) { // Index 0 is unused
342 jbyte tag = cp->tag_at(index).value();
343 switch (tag) {
344 case JVM_CONSTANT_Class :
345 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
346 break;
347 case JVM_CONSTANT_Fieldref :
348 // fall through
349 case JVM_CONSTANT_Methodref :
350 // fall through
351 case JVM_CONSTANT_InterfaceMethodref : {
352 if (!_need_verify) break;
353 int klass_ref_index = cp->klass_ref_index_at(index);
354 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
355 check_property(valid_klass_reference_at(klass_ref_index),
356 "Invalid constant pool index %u in class file %s",
357 klass_ref_index,
358 CHECK_(nullHandle));
359 check_property(valid_cp_range(name_and_type_ref_index, length) &&
360 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
361 "Invalid constant pool index %u in class file %s",
362 name_and_type_ref_index,
363 CHECK_(nullHandle));
364 break;
365 }
366 case JVM_CONSTANT_String :
367 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
368 break;
369 case JVM_CONSTANT_Integer :
370 break;
371 case JVM_CONSTANT_Float :
372 break;
373 case JVM_CONSTANT_Long :
374 case JVM_CONSTANT_Double :
375 index++;
376 check_property(
377 (index < length && cp->tag_at(index).is_invalid()),
378 "Improper constant pool long/double index %u in class file %s",
379 index, CHECK_(nullHandle));
380 break;
381 case JVM_CONSTANT_NameAndType : {
382 if (!_need_verify) break;
383 int name_ref_index = cp->name_ref_index_at(index);
384 int signature_ref_index = cp->signature_ref_index_at(index);
385 check_property(valid_symbol_at(name_ref_index),
386 "Invalid constant pool index %u in class file %s",
387 name_ref_index, CHECK_(nullHandle));
388 check_property(valid_symbol_at(signature_ref_index),
389 "Invalid constant pool index %u in class file %s",
390 signature_ref_index, CHECK_(nullHandle));
391 break;
392 }
393 case JVM_CONSTANT_Utf8 :
394 break;
395 case JVM_CONSTANT_UnresolvedClass : // fall-through
396 case JVM_CONSTANT_UnresolvedClassInError:
397 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
398 break;
399 case JVM_CONSTANT_ClassIndex :
400 {
401 int class_index = cp->klass_index_at(index);
402 check_property(valid_symbol_at(class_index),
403 "Invalid constant pool index %u in class file %s",
404 class_index, CHECK_(nullHandle));
405 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
406 }
407 break;
408 case JVM_CONSTANT_StringIndex :
409 {
410 int string_index = cp->string_index_at(index);
411 check_property(valid_symbol_at(string_index),
412 "Invalid constant pool index %u in class file %s",
413 string_index, CHECK_(nullHandle));
414 Symbol* sym = cp->symbol_at(string_index);
415 cp->unresolved_string_at_put(index, sym);
416 }
417 break;
418 case JVM_CONSTANT_MethodHandle :
419 {
420 int ref_index = cp->method_handle_index_at(index);
421 check_property(
422 valid_cp_range(ref_index, length) &&
423 EnableInvokeDynamic,
424 "Invalid constant pool index %u in class file %s",
425 ref_index, CHECK_(nullHandle));
426 constantTag tag = cp->tag_at(ref_index);
427 int ref_kind = cp->method_handle_ref_kind_at(index);
428 switch (ref_kind) {
429 case JVM_REF_getField:
430 case JVM_REF_getStatic:
431 case JVM_REF_putField:
432 case JVM_REF_putStatic:
433 check_property(
434 tag.is_field(),
435 "Invalid constant pool index %u in class file %s (not a field)",
436 ref_index, CHECK_(nullHandle));
437 break;
438 case JVM_REF_invokeVirtual:
439 case JVM_REF_invokeStatic:
440 case JVM_REF_invokeSpecial:
441 case JVM_REF_newInvokeSpecial:
442 check_property(
443 tag.is_method(),
444 "Invalid constant pool index %u in class file %s (not a method)",
445 ref_index, CHECK_(nullHandle));
446 break;
447 case JVM_REF_invokeInterface:
448 check_property(
449 tag.is_interface_method(),
450 "Invalid constant pool index %u in class file %s (not an interface method)",
451 ref_index, CHECK_(nullHandle));
452 break;
453 default:
454 classfile_parse_error(
455 "Bad method handle kind at constant pool index %u in class file %s",
456 index, CHECK_(nullHandle));
457 }
458 // Keep the ref_index unchanged. It will be indirected at link-time.
459 }
460 break;
461 case JVM_CONSTANT_MethodType :
462 {
463 int ref_index = cp->method_type_index_at(index);
464 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
465 "Invalid constant pool index %u in class file %s",
466 ref_index, CHECK_(nullHandle));
467 }
468 break;
469 case JVM_CONSTANT_InvokeDynamic :
470 {
471 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
472 check_property(valid_cp_range(name_and_type_ref_index, length) &&
473 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
474 "Invalid constant pool index %u in class file %s",
475 name_and_type_ref_index,
476 CHECK_(nullHandle));
477 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
478 break;
479 }
480 default:
481 fatal(err_msg("bad constant pool tag value %u",
482 cp->tag_at(index).value()));
483 ShouldNotReachHere();
484 break;
485 } // end of switch
486 } // end of for
487
488 if (_cp_patches != NULL) {
489 // need to treat this_class specially...
490 assert(EnableInvokeDynamic, "");
491 int this_class_index;
492 {
493 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
494 u1* mark = cfs->current();
495 u2 flags = cfs->get_u2_fast();
496 this_class_index = cfs->get_u2_fast();
497 cfs->set_current(mark); // revert to mark
498 }
499
500 for (index = 1; index < length; index++) { // Index 0 is unused
501 if (has_cp_patch_at(index)) {
502 guarantee_property(index != this_class_index,
503 "Illegal constant pool patch to self at %d in class file %s",
504 index, CHECK_(nullHandle));
505 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
506 }
507 }
508 }
509
510 if (!_need_verify) {
511 return cp;
512 }
513
514 // second verification pass - checks the strings are of the right format.
515 // but not yet to the other entries
516 for (index = 1; index < length; index++) {
517 jbyte tag = cp->tag_at(index).value();
518 switch (tag) {
519 case JVM_CONSTANT_UnresolvedClass: {
520 Symbol* class_name = cp->unresolved_klass_at(index);
521 // check the name, even if _cp_patches will overwrite it
522 verify_legal_class_name(class_name, CHECK_(nullHandle));
523 break;
524 }
525 case JVM_CONSTANT_NameAndType: {
526 if (_need_verify && _major_version >= JAVA_7_VERSION) {
527 int sig_index = cp->signature_ref_index_at(index);
528 int name_index = cp->name_ref_index_at(index);
529 Symbol* name = cp->symbol_at(name_index);
530 Symbol* sig = cp->symbol_at(sig_index);
531 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
532 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
533 } else {
534 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
535 }
536 }
537 break;
538 }
539 case JVM_CONSTANT_InvokeDynamic:
540 case JVM_CONSTANT_Fieldref:
541 case JVM_CONSTANT_Methodref:
542 case JVM_CONSTANT_InterfaceMethodref: {
543 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
544 // already verified to be utf8
545 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
546 // already verified to be utf8
547 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
548 Symbol* name = cp->symbol_at(name_ref_index);
549 Symbol* signature = cp->symbol_at(signature_ref_index);
550 if (tag == JVM_CONSTANT_Fieldref) {
551 verify_legal_field_name(name, CHECK_(nullHandle));
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 // Signature is verified above, when iterating NameAndType_info.
554 // Need only to be sure it's the right type.
555 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
556 throwIllegalSignature(
557 "Field", name, signature, CHECK_(nullHandle));
558 }
559 } else {
560 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
561 }
562 } else {
563 verify_legal_method_name(name, CHECK_(nullHandle));
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 // Signature is verified above, when iterating NameAndType_info.
566 // Need only to be sure it's the right type.
567 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
568 throwIllegalSignature(
569 "Method", name, signature, CHECK_(nullHandle));
570 }
571 } else {
572 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
573 }
574 if (tag == JVM_CONSTANT_Methodref) {
575 // 4509014: If a class method name begins with '<', it must be "<init>".
576 assert(name != NULL, "method name in constant pool is null");
577 unsigned int name_len = name->utf8_length();
578 assert(name_len > 0, "bad method name"); // already verified as legal name
579 if (name->byte_at(0) == '<') {
580 if (name != vmSymbols::object_initializer_name()) {
581 classfile_parse_error(
582 "Bad method name at constant pool index %u in class file %s",
583 name_ref_index, CHECK_(nullHandle));
584 }
585 }
586 }
587 }
588 break;
589 }
590 case JVM_CONSTANT_MethodHandle: {
591 int ref_index = cp->method_handle_index_at(index);
592 int ref_kind = cp->method_handle_ref_kind_at(index);
593 switch (ref_kind) {
594 case JVM_REF_invokeVirtual:
595 case JVM_REF_invokeStatic:
596 case JVM_REF_invokeSpecial:
597 case JVM_REF_newInvokeSpecial:
598 {
599 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
600 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
601 Symbol* name = cp->symbol_at(name_ref_index);
602 if (ref_kind == JVM_REF_newInvokeSpecial) {
603 if (name != vmSymbols::object_initializer_name()) {
604 classfile_parse_error(
605 "Bad constructor name at constant pool index %u in class file %s",
606 name_ref_index, CHECK_(nullHandle));
607 }
608 } else {
609 if (name == vmSymbols::object_initializer_name()) {
610 classfile_parse_error(
611 "Bad method name at constant pool index %u in class file %s",
612 name_ref_index, CHECK_(nullHandle));
613 }
614 }
615 }
616 break;
617 // Other ref_kinds are already fully checked in previous pass.
618 }
619 break;
620 }
621 case JVM_CONSTANT_MethodType: {
622 Symbol* no_name = vmSymbols::type_name(); // place holder
623 Symbol* signature = cp->method_type_signature_at(index);
624 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
625 break;
626 }
627 case JVM_CONSTANT_Utf8: {
628 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
629 }
630 } // end of switch
631 } // end of for
632
633 return cp;
634 }
635
636
637 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
638 assert(EnableInvokeDynamic, "");
639 BasicType patch_type = T_VOID;
640
641 switch (cp->tag_at(index).value()) {
642
643 case JVM_CONSTANT_UnresolvedClass :
644 // Patching a class means pre-resolving it.
645 // The name in the constant pool is ignored.
646 if (java_lang_Class::is_instance(patch())) {
647 guarantee_property(!java_lang_Class::is_primitive(patch()),
648 "Illegal class patch at %d in class file %s",
649 index, CHECK);
650 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
651 } else {
652 guarantee_property(java_lang_String::is_instance(patch()),
653 "Illegal class patch at %d in class file %s",
654 index, CHECK);
655 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
656 cp->unresolved_klass_at_put(index, name);
657 }
658 break;
659
660 case JVM_CONSTANT_String :
661 // skip this patch and don't clear it. Needs the oop array for resolved
662 // references to be created first.
663 return;
664
665 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
666 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
667 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
668 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
669 patch_prim:
670 {
671 jvalue value;
672 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
673 guarantee_property(value_type == patch_type,
674 "Illegal primitive patch at %d in class file %s",
675 index, CHECK);
676 switch (value_type) {
677 case T_INT: cp->int_at_put(index, value.i); break;
678 case T_FLOAT: cp->float_at_put(index, value.f); break;
679 case T_LONG: cp->long_at_put(index, value.j); break;
680 case T_DOUBLE: cp->double_at_put(index, value.d); break;
681 default: assert(false, "");
682 }
683 }
684 break;
685
686 default:
687 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
688 guarantee_property(!has_cp_patch_at(index),
689 "Illegal unexpected patch at %d in class file %s",
690 index, CHECK);
691 return;
692 }
693
694 // On fall-through, mark the patch as used.
695 clear_cp_patch_at(index);
696 }
697
698
699
700 class NameSigHash: public ResourceObj {
701 public:
702 Symbol* _name; // name
703 Symbol* _sig; // signature
704 NameSigHash* _next; // Next entry in hash table
705 };
706
707
708 #define HASH_ROW_SIZE 256
709
710 unsigned int hash(Symbol* name, Symbol* sig) {
711 unsigned int raw_hash = 0;
712 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
713 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
714
715 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
716 }
717
718
719 void initialize_hashtable(NameSigHash** table) {
720 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
721 }
722
723 // Return false if the name/sig combination is found in table.
724 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
725 // The old format checker uses heap sort to find duplicates.
726 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
727 // of table since we don't expect Symbol*'s to move.
728 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
729 assert(name != NULL, "name in constant pool is NULL");
730
731 // First lookup for duplicates
732 int index = hash(name, sig);
733 NameSigHash* entry = table[index];
734 while (entry != NULL) {
735 if (entry->_name == name && entry->_sig == sig) {
736 return false;
737 }
738 entry = entry->_next;
739 }
740
741 // No duplicate is found, allocate a new entry and fill it.
742 entry = new NameSigHash();
743 entry->_name = name;
744 entry->_sig = sig;
745
746 // Insert into hash table
747 entry->_next = table[index];
748 table[index] = entry;
749
750 return true;
751 }
752
753
754 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
755 Handle protection_domain,
756 Symbol* class_name,
757 bool* has_default_methods,
758 TRAPS) {
759 if (length == 0) {
760 _local_interfaces = Universe::the_empty_klass_array();
761 } else {
762 ClassFileStream* cfs = stream();
763 assert(length > 0, "only called for length>0");
764 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
765
766 int index;
767 for (index = 0; index < length; index++) {
768 u2 interface_index = cfs->get_u2(CHECK_NULL);
769 KlassHandle interf;
770 check_property(
771 valid_klass_reference_at(interface_index),
772 "Interface name has bad constant pool index %u in class file %s",
773 interface_index, CHECK_NULL);
774 if (_cp->tag_at(interface_index).is_klass()) {
775 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
776 } else {
777 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
778
779 // Don't need to check legal name because it's checked when parsing constant pool.
780 // But need to make sure it's not an array type.
781 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
782 "Bad interface name in class file %s", CHECK_NULL);
783 Handle class_loader(THREAD, _loader_data->class_loader());
784
785 // Call resolve_super so classcircularity is checked
786 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
787 unresolved_klass, class_loader, protection_domain,
788 false, CHECK_NULL);
789 interf = KlassHandle(THREAD, k);
790 }
791
792 if (!interf()->is_interface()) {
793 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
794 }
795 if (InstanceKlass::cast(interf())->has_default_methods()) {
796 *has_default_methods = true;
797 }
798 _local_interfaces->at_put(index, interf());
799 }
800
801 if (!_need_verify || length <= 1) {
802 return _local_interfaces;
803 }
804
805 // Check if there's any duplicates in interfaces
806 ResourceMark rm(THREAD);
807 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
808 THREAD, NameSigHash*, HASH_ROW_SIZE);
809 initialize_hashtable(interface_names);
810 bool dup = false;
811 {
812 debug_only(No_Safepoint_Verifier nsv;)
813 for (index = 0; index < length; index++) {
814 Klass* k = _local_interfaces->at(index);
815 Symbol* name = InstanceKlass::cast(k)->name();
816 // If no duplicates, add (name, NULL) in hashtable interface_names.
817 if (!put_after_lookup(name, NULL, interface_names)) {
818 dup = true;
819 break;
820 }
821 }
822 }
823 if (dup) {
824 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
825 }
826 }
827 return _local_interfaces;
828 }
829
830
831 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
832 // Make sure the constant pool entry is of a type appropriate to this field
833 guarantee_property(
834 (constantvalue_index > 0 &&
835 constantvalue_index < _cp->length()),
836 "Bad initial value index %u in ConstantValue attribute in class file %s",
837 constantvalue_index, CHECK);
838 constantTag value_type = _cp->tag_at(constantvalue_index);
839 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
840 case T_LONG:
841 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
842 break;
843 case T_FLOAT:
844 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
845 break;
846 case T_DOUBLE:
847 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
848 break;
849 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
850 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
851 break;
852 case T_OBJECT:
853 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
854 && value_type.is_string()),
855 "Bad string initial value in class file %s", CHECK);
856 break;
857 default:
858 classfile_parse_error(
859 "Unable to set initial value %u in class file %s",
860 constantvalue_index, CHECK);
861 }
862 }
863
864
865 // Parse attributes for a field.
866 void ClassFileParser::parse_field_attributes(u2 attributes_count,
867 bool is_static, u2 signature_index,
868 u2* constantvalue_index_addr,
869 bool* is_synthetic_addr,
870 u2* generic_signature_index_addr,
871 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
872 TRAPS) {
873 ClassFileStream* cfs = stream();
874 assert(attributes_count > 0, "length should be greater than 0");
875 u2 constantvalue_index = 0;
876 u2 generic_signature_index = 0;
877 bool is_synthetic = false;
878 u1* runtime_visible_annotations = NULL;
879 int runtime_visible_annotations_length = 0;
880 u1* runtime_invisible_annotations = NULL;
881 int runtime_invisible_annotations_length = 0;
882 u1* runtime_visible_type_annotations = NULL;
883 int runtime_visible_type_annotations_length = 0;
884 u1* runtime_invisible_type_annotations = NULL;
885 int runtime_invisible_type_annotations_length = 0;
886 while (attributes_count--) {
887 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
888 u2 attribute_name_index = cfs->get_u2_fast();
889 u4 attribute_length = cfs->get_u4_fast();
890 check_property(valid_symbol_at(attribute_name_index),
891 "Invalid field attribute index %u in class file %s",
892 attribute_name_index,
893 CHECK);
894 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
895 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
896 // ignore if non-static
897 if (constantvalue_index != 0) {
898 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
899 }
900 check_property(
901 attribute_length == 2,
902 "Invalid ConstantValue field attribute length %u in class file %s",
903 attribute_length, CHECK);
904 constantvalue_index = cfs->get_u2(CHECK);
905 if (_need_verify) {
906 verify_constantvalue(constantvalue_index, signature_index, CHECK);
907 }
908 } else if (attribute_name == vmSymbols::tag_synthetic()) {
909 if (attribute_length != 0) {
910 classfile_parse_error(
911 "Invalid Synthetic field attribute length %u in class file %s",
912 attribute_length, CHECK);
913 }
914 is_synthetic = true;
915 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
916 if (attribute_length != 0) {
917 classfile_parse_error(
918 "Invalid Deprecated field attribute length %u in class file %s",
919 attribute_length, CHECK);
920 }
921 } else if (_major_version >= JAVA_1_5_VERSION) {
922 if (attribute_name == vmSymbols::tag_signature()) {
923 if (attribute_length != 2) {
924 classfile_parse_error(
925 "Wrong size %u for field's Signature attribute in class file %s",
926 attribute_length, CHECK);
927 }
928 generic_signature_index = cfs->get_u2(CHECK);
929 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
930 runtime_visible_annotations_length = attribute_length;
931 runtime_visible_annotations = cfs->get_u1_buffer();
932 assert(runtime_visible_annotations != NULL, "null visible annotations");
933 parse_annotations(runtime_visible_annotations,
934 runtime_visible_annotations_length,
935 parsed_annotations,
936 CHECK);
937 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
938 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
939 runtime_invisible_annotations_length = attribute_length;
940 runtime_invisible_annotations = cfs->get_u1_buffer();
941 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
942 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
943 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
944 runtime_visible_type_annotations_length = attribute_length;
945 runtime_visible_type_annotations = cfs->get_u1_buffer();
946 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
947 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
948 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
949 runtime_invisible_type_annotations_length = attribute_length;
950 runtime_invisible_type_annotations = cfs->get_u1_buffer();
951 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
952 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
953 } else {
954 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
955 }
956 } else {
957 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
958 }
959 }
960
961 *constantvalue_index_addr = constantvalue_index;
962 *is_synthetic_addr = is_synthetic;
963 *generic_signature_index_addr = generic_signature_index;
964 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
965 runtime_visible_annotations_length,
966 runtime_invisible_annotations,
967 runtime_invisible_annotations_length,
968 CHECK);
969 parsed_annotations->set_field_annotations(a);
970 a = assemble_annotations(runtime_visible_type_annotations,
971 runtime_visible_type_annotations_length,
972 runtime_invisible_type_annotations,
973 runtime_invisible_type_annotations_length,
974 CHECK);
975 parsed_annotations->set_field_type_annotations(a);
976 return;
977 }
978
979
980 // Field allocation types. Used for computing field offsets.
981
982 enum FieldAllocationType {
983 STATIC_OOP, // Oops
984 STATIC_BYTE, // Boolean, Byte, char
985 STATIC_SHORT, // shorts
986 STATIC_WORD, // ints
987 STATIC_DOUBLE, // aligned long or double
988 NONSTATIC_OOP,
989 NONSTATIC_BYTE,
990 NONSTATIC_SHORT,
991 NONSTATIC_WORD,
992 NONSTATIC_DOUBLE,
993 MAX_FIELD_ALLOCATION_TYPE,
994 BAD_ALLOCATION_TYPE = -1
995 };
996
997 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
998 BAD_ALLOCATION_TYPE, // 0
999 BAD_ALLOCATION_TYPE, // 1
1000 BAD_ALLOCATION_TYPE, // 2
1001 BAD_ALLOCATION_TYPE, // 3
1002 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1003 NONSTATIC_SHORT, // T_CHAR = 5,
1004 NONSTATIC_WORD, // T_FLOAT = 6,
1005 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1006 NONSTATIC_BYTE, // T_BYTE = 8,
1007 NONSTATIC_SHORT, // T_SHORT = 9,
1008 NONSTATIC_WORD, // T_INT = 10,
1009 NONSTATIC_DOUBLE, // T_LONG = 11,
1010 NONSTATIC_OOP, // T_OBJECT = 12,
1011 NONSTATIC_OOP, // T_ARRAY = 13,
1012 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1013 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1014 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1015 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1016 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1017 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1018 BAD_ALLOCATION_TYPE, // 0
1019 BAD_ALLOCATION_TYPE, // 1
1020 BAD_ALLOCATION_TYPE, // 2
1021 BAD_ALLOCATION_TYPE, // 3
1022 STATIC_BYTE , // T_BOOLEAN = 4,
1023 STATIC_SHORT, // T_CHAR = 5,
1024 STATIC_WORD, // T_FLOAT = 6,
1025 STATIC_DOUBLE, // T_DOUBLE = 7,
1026 STATIC_BYTE, // T_BYTE = 8,
1027 STATIC_SHORT, // T_SHORT = 9,
1028 STATIC_WORD, // T_INT = 10,
1029 STATIC_DOUBLE, // T_LONG = 11,
1030 STATIC_OOP, // T_OBJECT = 12,
1031 STATIC_OOP, // T_ARRAY = 13,
1032 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1033 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1034 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1035 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1036 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1037 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1038 };
1039
1040 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1041 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1042 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1043 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1044 return result;
1045 }
1046
1047 class FieldAllocationCount: public ResourceObj {
1048 public:
1049 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1050
1051 FieldAllocationCount() {
1052 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1053 count[i] = 0;
1054 }
1055 }
1056
1057 FieldAllocationType update(bool is_static, BasicType type) {
1058 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1059 // Make sure there is no overflow with injected fields.
1060 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1061 count[atype]++;
1062 return atype;
1063 }
1064 };
1065
1066 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1067 bool is_interface,
1068 FieldAllocationCount *fac,
1069 u2* java_fields_count_ptr, TRAPS) {
1070 ClassFileStream* cfs = stream();
1071 cfs->guarantee_more(2, CHECK_NULL); // length
1072 u2 length = cfs->get_u2_fast();
1073 *java_fields_count_ptr = length;
1074
1075 int num_injected = 0;
1076 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1077 int total_fields = length + num_injected;
1078
1079 // The field array starts with tuples of shorts
1080 // [access, name index, sig index, initial value index, byte offset].
1081 // A generic signature slot only exists for field with generic
1082 // signature attribute. And the access flag is set with
1083 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1084 // signature slots are at the end of the field array and after all
1085 // other fields data.
1086 //
1087 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1088 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1089 // ...
1090 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1091 // [generic signature index]
1092 // [generic signature index]
1093 // ...
1094 //
1095 // Allocate a temporary resource array for field data. For each field,
1096 // a slot is reserved in the temporary array for the generic signature
1097 // index. After parsing all fields, the data are copied to a permanent
1098 // array and any unused slots will be discarded.
1099 ResourceMark rm(THREAD);
1100 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1101 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1102
1103 // The generic signature slots start after all other fields' data.
1104 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1105 int num_generic_signature = 0;
1106 for (int n = 0; n < length; n++) {
1107 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1108
1109 AccessFlags access_flags;
1110 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1111 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1112 access_flags.set_flags(flags);
1113
1114 u2 name_index = cfs->get_u2_fast();
1115 int cp_size = _cp->length();
1116 check_property(valid_symbol_at(name_index),
1117 "Invalid constant pool index %u for field name in class file %s",
1118 name_index,
1119 CHECK_NULL);
1120 Symbol* name = _cp->symbol_at(name_index);
1121 verify_legal_field_name(name, CHECK_NULL);
1122
1123 u2 signature_index = cfs->get_u2_fast();
1124 check_property(valid_symbol_at(signature_index),
1125 "Invalid constant pool index %u for field signature in class file %s",
1126 signature_index, CHECK_NULL);
1127 Symbol* sig = _cp->symbol_at(signature_index);
1128 verify_legal_field_signature(name, sig, CHECK_NULL);
1129
1130 u2 constantvalue_index = 0;
1131 bool is_synthetic = false;
1132 u2 generic_signature_index = 0;
1133 bool is_static = access_flags.is_static();
1134 FieldAnnotationCollector parsed_annotations(_loader_data);
1135
1136 u2 attributes_count = cfs->get_u2_fast();
1137 if (attributes_count > 0) {
1138 parse_field_attributes(attributes_count, is_static, signature_index,
1139 &constantvalue_index, &is_synthetic,
1140 &generic_signature_index, &parsed_annotations,
1141 CHECK_NULL);
1142 if (parsed_annotations.field_annotations() != NULL) {
1143 if (_fields_annotations == NULL) {
1144 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1145 _loader_data, length, NULL,
1146 CHECK_NULL);
1147 }
1148 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1149 parsed_annotations.set_field_annotations(NULL);
1150 }
1151 if (parsed_annotations.field_type_annotations() != NULL) {
1152 if (_fields_type_annotations == NULL) {
1153 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1154 _loader_data, length, NULL,
1155 CHECK_NULL);
1156 }
1157 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1158 parsed_annotations.set_field_type_annotations(NULL);
1159 }
1160
1161 if (is_synthetic) {
1162 access_flags.set_is_synthetic();
1163 }
1164 if (generic_signature_index != 0) {
1165 access_flags.set_field_has_generic_signature();
1166 fa[generic_signature_slot] = generic_signature_index;
1167 generic_signature_slot ++;
1168 num_generic_signature ++;
1169 }
1170 }
1171
1172 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1173 field->initialize(access_flags.as_short(),
1174 name_index,
1175 signature_index,
1176 constantvalue_index);
1177 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1178
1179 // Remember how many oops we encountered and compute allocation type
1180 FieldAllocationType atype = fac->update(is_static, type);
1181 field->set_allocation_type(atype);
1182
1183 // After field is initialized with type, we can augment it with aux info
1184 if (parsed_annotations.has_any_annotations())
1185 parsed_annotations.apply_to(field);
1186 }
1187
1188 int index = length;
1189 if (num_injected != 0) {
1190 for (int n = 0; n < num_injected; n++) {
1191 // Check for duplicates
1192 if (injected[n].may_be_java) {
1193 Symbol* name = injected[n].name();
1194 Symbol* signature = injected[n].signature();
1195 bool duplicate = false;
1196 for (int i = 0; i < length; i++) {
1197 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1198 if (name == _cp->symbol_at(f->name_index()) &&
1199 signature == _cp->symbol_at(f->signature_index())) {
1200 // Symbol is desclared in Java so skip this one
1201 duplicate = true;
1202 break;
1203 }
1204 }
1205 if (duplicate) {
1206 // These will be removed from the field array at the end
1207 continue;
1208 }
1209 }
1210
1211 // Injected field
1212 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1213 field->initialize(JVM_ACC_FIELD_INTERNAL,
1214 injected[n].name_index,
1215 injected[n].signature_index,
1216 0);
1217
1218 BasicType type = FieldType::basic_type(injected[n].signature());
1219
1220 // Remember how many oops we encountered and compute allocation type
1221 FieldAllocationType atype = fac->update(false, type);
1222 field->set_allocation_type(atype);
1223 index++;
1224 }
1225 }
1226
1227 // Now copy the fields' data from the temporary resource array.
1228 // Sometimes injected fields already exist in the Java source so
1229 // the fields array could be too long. In that case the
1230 // fields array is trimed. Also unused slots that were reserved
1231 // for generic signature indexes are discarded.
1232 Array<u2>* fields = MetadataFactory::new_array<u2>(
1233 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1234 CHECK_NULL);
1235 _fields = fields; // save in case of error
1236 {
1237 int i = 0;
1238 for (; i < index * FieldInfo::field_slots; i++) {
1239 fields->at_put(i, fa[i]);
1240 }
1241 for (int j = total_fields * FieldInfo::field_slots;
1242 j < generic_signature_slot; j++) {
1243 fields->at_put(i++, fa[j]);
1244 }
1245 assert(i == fields->length(), "");
1246 }
1247
1248 if (_need_verify && length > 1) {
1249 // Check duplicated fields
1250 ResourceMark rm(THREAD);
1251 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1252 THREAD, NameSigHash*, HASH_ROW_SIZE);
1253 initialize_hashtable(names_and_sigs);
1254 bool dup = false;
1255 {
1256 debug_only(No_Safepoint_Verifier nsv;)
1257 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1258 Symbol* name = fs.name();
1259 Symbol* sig = fs.signature();
1260 // If no duplicates, add name/signature in hashtable names_and_sigs.
1261 if (!put_after_lookup(name, sig, names_and_sigs)) {
1262 dup = true;
1263 break;
1264 }
1265 }
1266 }
1267 if (dup) {
1268 classfile_parse_error("Duplicate field name&signature in class file %s",
1269 CHECK_NULL);
1270 }
1271 }
1272
1273 return fields;
1274 }
1275
1276
1277 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1278 while (length-- > 0) {
1279 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1280 }
1281 }
1282
1283
1284 u2* ClassFileParser::parse_exception_table(u4 code_length,
1285 u4 exception_table_length,
1286 TRAPS) {
1287 ClassFileStream* cfs = stream();
1288
1289 u2* exception_table_start = cfs->get_u2_buffer();
1290 assert(exception_table_start != NULL, "null exception table");
1291 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1292 // Will check legal target after parsing code array in verifier.
1293 if (_need_verify) {
1294 for (unsigned int i = 0; i < exception_table_length; i++) {
1295 u2 start_pc = cfs->get_u2_fast();
1296 u2 end_pc = cfs->get_u2_fast();
1297 u2 handler_pc = cfs->get_u2_fast();
1298 u2 catch_type_index = cfs->get_u2_fast();
1299 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1300 "Illegal exception table range in class file %s",
1301 CHECK_NULL);
1302 guarantee_property(handler_pc < code_length,
1303 "Illegal exception table handler in class file %s",
1304 CHECK_NULL);
1305 if (catch_type_index != 0) {
1306 guarantee_property(valid_klass_reference_at(catch_type_index),
1307 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1308 }
1309 }
1310 } else {
1311 cfs->skip_u2_fast(exception_table_length * 4);
1312 }
1313 return exception_table_start;
1314 }
1315
1316 void ClassFileParser::parse_linenumber_table(
1317 u4 code_attribute_length, u4 code_length,
1318 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1319 ClassFileStream* cfs = stream();
1320 unsigned int num_entries = cfs->get_u2(CHECK);
1321
1322 // Each entry is a u2 start_pc, and a u2 line_number
1323 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1324
1325 // Verify line number attribute and table length
1326 check_property(
1327 code_attribute_length == sizeof(u2) + length_in_bytes,
1328 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1329
1330 cfs->guarantee_more(length_in_bytes, CHECK);
1331
1332 if ((*write_stream) == NULL) {
1333 if (length_in_bytes > fixed_buffer_size) {
1334 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1335 } else {
1336 (*write_stream) = new CompressedLineNumberWriteStream(
1337 linenumbertable_buffer, fixed_buffer_size);
1338 }
1339 }
1340
1341 while (num_entries-- > 0) {
1342 u2 bci = cfs->get_u2_fast(); // start_pc
1343 u2 line = cfs->get_u2_fast(); // line_number
1344 guarantee_property(bci < code_length,
1345 "Invalid pc in LineNumberTable in class file %s", CHECK);
1346 (*write_stream)->write_pair(bci, line);
1347 }
1348 }
1349
1350
1351 // Class file LocalVariableTable elements.
1352 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1353 public:
1354 u2 start_bci;
1355 u2 length;
1356 u2 name_cp_index;
1357 u2 descriptor_cp_index;
1358 u2 slot;
1359 };
1360
1361
1362 class LVT_Hash: public CHeapObj<mtClass> {
1363 public:
1364 LocalVariableTableElement *_elem; // element
1365 LVT_Hash* _next; // Next entry in hash table
1366 };
1367
1368 unsigned int hash(LocalVariableTableElement *elem) {
1369 unsigned int raw_hash = elem->start_bci;
1370
1371 raw_hash = elem->length + raw_hash * 37;
1372 raw_hash = elem->name_cp_index + raw_hash * 37;
1373 raw_hash = elem->slot + raw_hash * 37;
1374
1375 return raw_hash % HASH_ROW_SIZE;
1376 }
1377
1378 void initialize_hashtable(LVT_Hash** table) {
1379 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1380 table[i] = NULL;
1381 }
1382 }
1383
1384 void clear_hashtable(LVT_Hash** table) {
1385 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1386 LVT_Hash* current = table[i];
1387 LVT_Hash* next;
1388 while (current != NULL) {
1389 next = current->_next;
1390 current->_next = NULL;
1391 delete(current);
1392 current = next;
1393 }
1394 table[i] = NULL;
1395 }
1396 }
1397
1398 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1399 LVT_Hash* entry = table[index];
1400
1401 /*
1402 * 3-tuple start_bci/length/slot has to be unique key,
1403 * so the following comparison seems to be redundant:
1404 * && elem->name_cp_index == entry->_elem->name_cp_index
1405 */
1406 while (entry != NULL) {
1407 if (elem->start_bci == entry->_elem->start_bci
1408 && elem->length == entry->_elem->length
1409 && elem->name_cp_index == entry->_elem->name_cp_index
1410 && elem->slot == entry->_elem->slot
1411 ) {
1412 return entry;
1413 }
1414 entry = entry->_next;
1415 }
1416 return NULL;
1417 }
1418
1419 // Return false if the local variable is found in table.
1420 // Return true if no duplicate is found.
1421 // And local variable is added as a new entry in table.
1422 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1423 // First lookup for duplicates
1424 int index = hash(elem);
1425 LVT_Hash* entry = LVT_lookup(elem, index, table);
1426
1427 if (entry != NULL) {
1428 return false;
1429 }
1430 // No duplicate is found, allocate a new entry and fill it.
1431 if ((entry = new LVT_Hash()) == NULL) {
1432 return false;
1433 }
1434 entry->_elem = elem;
1435
1436 // Insert into hash table
1437 entry->_next = table[index];
1438 table[index] = entry;
1439
1440 return true;
1441 }
1442
1443 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1444 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1445 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1446 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1447 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1448 lvt->signature_cp_index = 0;
1449 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1450 }
1451
1452 // Function is used to parse both attributes:
1453 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1454 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1455 u2 max_locals,
1456 u4 code_attribute_length,
1457 u2* localvariable_table_length,
1458 bool isLVTT,
1459 TRAPS) {
1460 ClassFileStream* cfs = stream();
1461 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1462 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1463 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1464 // Verify local variable table attribute has right length
1465 if (_need_verify) {
1466 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1467 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1468 }
1469 u2* localvariable_table_start = cfs->get_u2_buffer();
1470 assert(localvariable_table_start != NULL, "null local variable table");
1471 if (!_need_verify) {
1472 cfs->skip_u2_fast(size);
1473 } else {
1474 cfs->guarantee_more(size * 2, CHECK_NULL);
1475 for(int i = 0; i < (*localvariable_table_length); i++) {
1476 u2 start_pc = cfs->get_u2_fast();
1477 u2 length = cfs->get_u2_fast();
1478 u2 name_index = cfs->get_u2_fast();
1479 u2 descriptor_index = cfs->get_u2_fast();
1480 u2 index = cfs->get_u2_fast();
1481 // Assign to a u4 to avoid overflow
1482 u4 end_pc = (u4)start_pc + (u4)length;
1483
1484 if (start_pc >= code_length) {
1485 classfile_parse_error(
1486 "Invalid start_pc %u in %s in class file %s",
1487 start_pc, tbl_name, CHECK_NULL);
1488 }
1489 if (end_pc > code_length) {
1490 classfile_parse_error(
1491 "Invalid length %u in %s in class file %s",
1492 length, tbl_name, CHECK_NULL);
1493 }
1494 int cp_size = _cp->length();
1495 guarantee_property(valid_symbol_at(name_index),
1496 "Name index %u in %s has bad constant type in class file %s",
1497 name_index, tbl_name, CHECK_NULL);
1498 guarantee_property(valid_symbol_at(descriptor_index),
1499 "Signature index %u in %s has bad constant type in class file %s",
1500 descriptor_index, tbl_name, CHECK_NULL);
1501
1502 Symbol* name = _cp->symbol_at(name_index);
1503 Symbol* sig = _cp->symbol_at(descriptor_index);
1504 verify_legal_field_name(name, CHECK_NULL);
1505 u2 extra_slot = 0;
1506 if (!isLVTT) {
1507 verify_legal_field_signature(name, sig, CHECK_NULL);
1508
1509 // 4894874: check special cases for double and long local variables
1510 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1511 sig == vmSymbols::type_signature(T_LONG)) {
1512 extra_slot = 1;
1513 }
1514 }
1515 guarantee_property((index + extra_slot) < max_locals,
1516 "Invalid index %u in %s in class file %s",
1517 index, tbl_name, CHECK_NULL);
1518 }
1519 }
1520 return localvariable_table_start;
1521 }
1522
1523
1524 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1525 u1* u1_array, u2* u2_array, TRAPS) {
1526 ClassFileStream* cfs = stream();
1527 u2 index = 0; // index in the array with long/double occupying two slots
1528 u4 i1 = *u1_index;
1529 u4 i2 = *u2_index + 1;
1530 for(int i = 0; i < array_length; i++) {
1531 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1532 index++;
1533 if (tag == ITEM_Long || tag == ITEM_Double) {
1534 index++;
1535 } else if (tag == ITEM_Object) {
1536 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1537 guarantee_property(valid_klass_reference_at(class_index),
1538 "Bad class index %u in StackMap in class file %s",
1539 class_index, CHECK);
1540 } else if (tag == ITEM_Uninitialized) {
1541 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1542 guarantee_property(
1543 offset < code_length,
1544 "Bad uninitialized type offset %u in StackMap in class file %s",
1545 offset, CHECK);
1546 } else {
1547 guarantee_property(
1548 tag <= (u1)ITEM_Uninitialized,
1549 "Unknown variable type %u in StackMap in class file %s",
1550 tag, CHECK);
1551 }
1552 }
1553 u2_array[*u2_index] = index;
1554 *u1_index = i1;
1555 *u2_index = i2;
1556 }
1557
1558 u1* ClassFileParser::parse_stackmap_table(
1559 u4 code_attribute_length, TRAPS) {
1560 if (code_attribute_length == 0)
1561 return NULL;
1562
1563 ClassFileStream* cfs = stream();
1564 u1* stackmap_table_start = cfs->get_u1_buffer();
1565 assert(stackmap_table_start != NULL, "null stackmap table");
1566
1567 // check code_attribute_length first
1568 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1569
1570 if (!_need_verify && !DumpSharedSpaces) {
1571 return NULL;
1572 }
1573 return stackmap_table_start;
1574 }
1575
1576 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1577 u4 method_attribute_length,
1578 TRAPS) {
1579 ClassFileStream* cfs = stream();
1580 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1581 *checked_exceptions_length = cfs->get_u2_fast();
1582 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1583 u2* checked_exceptions_start = cfs->get_u2_buffer();
1584 assert(checked_exceptions_start != NULL, "null checked exceptions");
1585 if (!_need_verify) {
1586 cfs->skip_u2_fast(size);
1587 } else {
1588 // Verify each value in the checked exception table
1589 u2 checked_exception;
1590 u2 len = *checked_exceptions_length;
1591 cfs->guarantee_more(2 * len, CHECK_NULL);
1592 for (int i = 0; i < len; i++) {
1593 checked_exception = cfs->get_u2_fast();
1594 check_property(
1595 valid_klass_reference_at(checked_exception),
1596 "Exception name has bad type at constant pool %u in class file %s",
1597 checked_exception, CHECK_NULL);
1598 }
1599 }
1600 // check exceptions attribute length
1601 if (_need_verify) {
1602 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1603 sizeof(u2) * size),
1604 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1605 }
1606 return checked_exceptions_start;
1607 }
1608
1609 void ClassFileParser::throwIllegalSignature(
1610 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1611 ResourceMark rm(THREAD);
1612 Exceptions::fthrow(THREAD_AND_LOCATION,
1613 vmSymbols::java_lang_ClassFormatError(),
1614 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1615 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1616 }
1617
1618 // Skip an annotation. Return >=limit if there is any problem.
1619 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1620 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1621 // value := switch (tag:u1) { ... }
1622 index += 2; // skip atype
1623 if ((index += 2) >= limit) return limit; // read nmem
1624 int nmem = Bytes::get_Java_u2(buffer+index-2);
1625 while (--nmem >= 0 && index < limit) {
1626 index += 2; // skip member
1627 index = skip_annotation_value(buffer, limit, index);
1628 }
1629 return index;
1630 }
1631
1632 // Skip an annotation value. Return >=limit if there is any problem.
1633 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1634 // value := switch (tag:u1) {
1635 // case B, C, I, S, Z, D, F, J, c: con:u2;
1636 // case e: e_class:u2 e_name:u2;
1637 // case s: s_con:u2;
1638 // case [: do(nval:u2) {value};
1639 // case @: annotation;
1640 // case s: s_con:u2;
1641 // }
1642 if ((index += 1) >= limit) return limit; // read tag
1643 u1 tag = buffer[index-1];
1644 switch (tag) {
1645 case 'B': case 'C': case 'I': case 'S': case 'Z':
1646 case 'D': case 'F': case 'J': case 'c': case 's':
1647 index += 2; // skip con or s_con
1648 break;
1649 case 'e':
1650 index += 4; // skip e_class, e_name
1651 break;
1652 case '[':
1653 {
1654 if ((index += 2) >= limit) return limit; // read nval
1655 int nval = Bytes::get_Java_u2(buffer+index-2);
1656 while (--nval >= 0 && index < limit) {
1657 index = skip_annotation_value(buffer, limit, index);
1658 }
1659 }
1660 break;
1661 case '@':
1662 index = skip_annotation(buffer, limit, index);
1663 break;
1664 default:
1665 assert(false, "annotation tag");
1666 return limit; // bad tag byte
1667 }
1668 return index;
1669 }
1670
1671 // Sift through annotations, looking for those significant to the VM:
1672 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1673 ClassFileParser::AnnotationCollector* coll,
1674 TRAPS) {
1675 // annotations := do(nann:u2) {annotation}
1676 int index = 0;
1677 if ((index += 2) >= limit) return; // read nann
1678 int nann = Bytes::get_Java_u2(buffer+index-2);
1679 enum { // initial annotation layout
1680 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1681 count_off = 2, // u2 such as 1 (one value)
1682 member_off = 4, // utf8 such as 'value'
1683 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1684 e_tag_val = 'e',
1685 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1686 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1687 e_size = 11, // end of 'e' annotation
1688 c_tag_val = 'c', // payload is type
1689 c_con_off = 7, // utf8 payload, such as 'I'
1690 c_size = 9, // end of 'c' annotation
1691 s_tag_val = 's', // payload is String
1692 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1693 s_size = 9,
1694 min_size = 6 // smallest possible size (zero members)
1695 };
1696 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1697 int index0 = index;
1698 index = skip_annotation(buffer, limit, index);
1699 u1* abase = buffer + index0;
1700 int atype = Bytes::get_Java_u2(abase + atype_off);
1701 int count = Bytes::get_Java_u2(abase + count_off);
1702 Symbol* aname = check_symbol_at(_cp, atype);
1703 if (aname == NULL) break; // invalid annotation name
1704 Symbol* member = NULL;
1705 if (count >= 1) {
1706 int member_index = Bytes::get_Java_u2(abase + member_off);
1707 member = check_symbol_at(_cp, member_index);
1708 if (member == NULL) break; // invalid member name
1709 }
1710
1711 // Here is where parsing particular annotations will take place.
1712 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1713 if (id == AnnotationCollector::_unknown) continue;
1714 coll->set_annotation(id);
1715
1716 if (id == AnnotationCollector::_sun_misc_Contended) {
1717 if (count == 1
1718 && s_size == (index - index0) // match size
1719 && s_tag_val == *(abase + tag_off)
1720 && member == vmSymbols::value_name()) {
1721 u2 group_index = Bytes::get_Java_u2(abase + s_con_off);
1722 coll->set_contended_group(group_index);
1723 } else {
1724 coll->set_contended_group(0); // default contended group
1725 }
1726 coll->set_contended(true);
1727 } else {
1728 coll->set_contended(false);
1729 }
1730 }
1731 }
1732
1733 ClassFileParser::AnnotationCollector::ID
1734 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1735 Symbol* name) {
1736 vmSymbols::SID sid = vmSymbols::find_sid(name);
1737 // Privileged code can use all annotations. Other code silently drops some.
1738 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1739 loader_data->is_ext_class_loader_data() ||
1740 loader_data->is_anonymous();
1741 switch (sid) {
1742 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1743 if (_location != _in_method) break; // only allow for methods
1744 if (!privileged) break; // only allow in privileged code
1745 return _method_CallerSensitive;
1746 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1747 if (_location != _in_method) break; // only allow for methods
1748 if (!privileged) break; // only allow in privileged code
1749 return _method_ForceInline;
1750 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1751 if (_location != _in_method) break; // only allow for methods
1752 if (!privileged) break; // only allow in privileged code
1753 return _method_DontInline;
1754 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1755 if (_location != _in_method) break; // only allow for methods
1756 if (!privileged) break; // only allow in privileged code
1757 return _method_LambdaForm_Compiled;
1758 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1759 if (_location != _in_method) break; // only allow for methods
1760 if (!privileged) break; // only allow in privileged code
1761 return _method_LambdaForm_Hidden;
1762 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1763 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1764 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1765 return _sun_misc_Contended;
1766 default: break;
1767 }
1768 return AnnotationCollector::_unknown;
1769 }
1770
1771 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1772 if (is_contended())
1773 f->set_contended_group(contended_group());
1774 }
1775
1776 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1777 // If there's an error deallocate metadata for field annotations
1778 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1779 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1780 }
1781
1782 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1783 if (has_annotation(_method_CallerSensitive))
1784 m->set_caller_sensitive(true);
1785 if (has_annotation(_method_ForceInline))
1786 m->set_force_inline(true);
1787 if (has_annotation(_method_DontInline))
1788 m->set_dont_inline(true);
1789 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1790 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1791 if (has_annotation(_method_LambdaForm_Hidden))
1792 m->set_hidden(true);
1793 }
1794
1795 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1796 k->set_is_contended(is_contended());
1797 }
1798
1799
1800 #define MAX_ARGS_SIZE 255
1801 #define MAX_CODE_SIZE 65535
1802 #define INITIAL_MAX_LVT_NUMBER 256
1803
1804 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1805 *
1806 * Rules for LVT's and LVTT's are:
1807 * - There can be any number of LVT's and LVTT's.
1808 * - If there are n LVT's, it is the same as if there was just
1809 * one LVT containing all the entries from the n LVT's.
1810 * - There may be no more than one LVT entry per local variable.
1811 * Two LVT entries are 'equal' if these fields are the same:
1812 * start_pc, length, name, slot
1813 * - There may be no more than one LVTT entry per each LVT entry.
1814 * Each LVTT entry has to match some LVT entry.
1815 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1816 */
1817 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1818 int lvt_cnt,
1819 u2* localvariable_table_length,
1820 u2** localvariable_table_start,
1821 int lvtt_cnt,
1822 u2* localvariable_type_table_length,
1823 u2** localvariable_type_table_start,
1824 TRAPS) {
1825
1826 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1827 initialize_hashtable(lvt_Hash);
1828
1829 // To fill LocalVariableTable in
1830 Classfile_LVT_Element* cf_lvt;
1831 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1832
1833 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1834 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1835 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1836 copy_lvt_element(&cf_lvt[idx], lvt);
1837 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1838 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1839 && _need_verify
1840 && _major_version >= JAVA_1_5_VERSION) {
1841 clear_hashtable(lvt_Hash);
1842 classfile_parse_error("Duplicated LocalVariableTable attribute "
1843 "entry for '%s' in class file %s",
1844 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1845 CHECK);
1846 }
1847 }
1848 }
1849
1850 // To merge LocalVariableTable and LocalVariableTypeTable
1851 Classfile_LVT_Element* cf_lvtt;
1852 LocalVariableTableElement lvtt_elem;
1853
1854 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1855 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1856 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1857 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1858 int index = hash(&lvtt_elem);
1859 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1860 if (entry == NULL) {
1861 if (_need_verify) {
1862 clear_hashtable(lvt_Hash);
1863 classfile_parse_error("LVTT entry for '%s' in class file %s "
1864 "does not match any LVT entry",
1865 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1866 CHECK);
1867 }
1868 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1869 clear_hashtable(lvt_Hash);
1870 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1871 "entry for '%s' in class file %s",
1872 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1873 CHECK);
1874 } else {
1875 // to add generic signatures into LocalVariableTable
1876 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1877 }
1878 }
1879 }
1880 clear_hashtable(lvt_Hash);
1881 }
1882
1883
1884 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1885 u1* runtime_visible_annotations,
1886 int runtime_visible_annotations_length,
1887 u1* runtime_invisible_annotations,
1888 int runtime_invisible_annotations_length,
1889 u1* runtime_visible_parameter_annotations,
1890 int runtime_visible_parameter_annotations_length,
1891 u1* runtime_invisible_parameter_annotations,
1892 int runtime_invisible_parameter_annotations_length,
1893 u1* runtime_visible_type_annotations,
1894 int runtime_visible_type_annotations_length,
1895 u1* runtime_invisible_type_annotations,
1896 int runtime_invisible_type_annotations_length,
1897 u1* annotation_default,
1898 int annotation_default_length,
1899 TRAPS) {
1900
1901 AnnotationArray* a;
1902
1903 if (runtime_visible_annotations_length +
1904 runtime_invisible_annotations_length > 0) {
1905 a = assemble_annotations(runtime_visible_annotations,
1906 runtime_visible_annotations_length,
1907 runtime_invisible_annotations,
1908 runtime_invisible_annotations_length,
1909 CHECK);
1910 cm->set_method_annotations(a);
1911 }
1912
1913 if (runtime_visible_parameter_annotations_length +
1914 runtime_invisible_parameter_annotations_length > 0) {
1915 a = assemble_annotations(runtime_visible_parameter_annotations,
1916 runtime_visible_parameter_annotations_length,
1917 runtime_invisible_parameter_annotations,
1918 runtime_invisible_parameter_annotations_length,
1919 CHECK);
1920 cm->set_parameter_annotations(a);
1921 }
1922
1923 if (annotation_default_length > 0) {
1924 a = assemble_annotations(annotation_default,
1925 annotation_default_length,
1926 NULL,
1927 0,
1928 CHECK);
1929 cm->set_default_annotations(a);
1930 }
1931
1932 if (runtime_visible_type_annotations_length +
1933 runtime_invisible_type_annotations_length > 0) {
1934 a = assemble_annotations(runtime_visible_type_annotations,
1935 runtime_visible_type_annotations_length,
1936 runtime_invisible_type_annotations,
1937 runtime_invisible_type_annotations_length,
1938 CHECK);
1939 cm->set_type_annotations(a);
1940 }
1941 }
1942
1943
1944 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1945 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1946 // Method* to save footprint, so we only know the size of the resulting Method* when the
1947 // entire method attribute is parsed.
1948 //
1949 // The promoted_flags parameter is used to pass relevant access_flags
1950 // from the method back up to the containing klass. These flag values
1951 // are added to klass's access_flags.
1952
1953 methodHandle ClassFileParser::parse_method(bool is_interface,
1954 AccessFlags *promoted_flags,
1955 TRAPS) {
1956 ClassFileStream* cfs = stream();
1957 methodHandle nullHandle;
1958 ResourceMark rm(THREAD);
1959 // Parse fixed parts
1960 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1961
1962 int flags = cfs->get_u2_fast();
1963 u2 name_index = cfs->get_u2_fast();
1964 int cp_size = _cp->length();
1965 check_property(
1966 valid_symbol_at(name_index),
1967 "Illegal constant pool index %u for method name in class file %s",
1968 name_index, CHECK_(nullHandle));
1969 Symbol* name = _cp->symbol_at(name_index);
1970 verify_legal_method_name(name, CHECK_(nullHandle));
1971
1972 u2 signature_index = cfs->get_u2_fast();
1973 guarantee_property(
1974 valid_symbol_at(signature_index),
1975 "Illegal constant pool index %u for method signature in class file %s",
1976 signature_index, CHECK_(nullHandle));
1977 Symbol* signature = _cp->symbol_at(signature_index);
1978
1979 AccessFlags access_flags;
1980 if (name == vmSymbols::class_initializer_name()) {
1981 // We ignore the other access flags for a valid class initializer.
1982 // (JVM Spec 2nd ed., chapter 4.6)
1983 if (_major_version < 51) { // backward compatibility
1984 flags = JVM_ACC_STATIC;
1985 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1986 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1987 }
1988 } else {
1989 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1990 }
1991
1992 int args_size = -1; // only used when _need_verify is true
1993 if (_need_verify) {
1994 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1995 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1996 if (args_size > MAX_ARGS_SIZE) {
1997 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1998 }
1999 }
2000
2001 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2002
2003 // Default values for code and exceptions attribute elements
2004 u2 max_stack = 0;
2005 u2 max_locals = 0;
2006 u4 code_length = 0;
2007 u1* code_start = 0;
2008 u2 exception_table_length = 0;
2009 u2* exception_table_start = NULL;
2010 Array<int>* exception_handlers = Universe::the_empty_int_array();
2011 u2 checked_exceptions_length = 0;
2012 u2* checked_exceptions_start = NULL;
2013 CompressedLineNumberWriteStream* linenumber_table = NULL;
2014 int linenumber_table_length = 0;
2015 int total_lvt_length = 0;
2016 u2 lvt_cnt = 0;
2017 u2 lvtt_cnt = 0;
2018 bool lvt_allocated = false;
2019 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2020 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2021 u2* localvariable_table_length;
2022 u2** localvariable_table_start;
2023 u2* localvariable_type_table_length;
2024 u2** localvariable_type_table_start;
2025 u2 method_parameters_length = 0;
2026 u1* method_parameters_data = NULL;
2027 bool method_parameters_seen = false;
2028 bool method_parameters_four_byte_flags;
2029 bool parsed_code_attribute = false;
2030 bool parsed_checked_exceptions_attribute = false;
2031 bool parsed_stackmap_attribute = false;
2032 // stackmap attribute - JDK1.5
2033 u1* stackmap_data = NULL;
2034 int stackmap_data_length = 0;
2035 u2 generic_signature_index = 0;
2036 MethodAnnotationCollector parsed_annotations;
2037 u1* runtime_visible_annotations = NULL;
2038 int runtime_visible_annotations_length = 0;
2039 u1* runtime_invisible_annotations = NULL;
2040 int runtime_invisible_annotations_length = 0;
2041 u1* runtime_visible_parameter_annotations = NULL;
2042 int runtime_visible_parameter_annotations_length = 0;
2043 u1* runtime_invisible_parameter_annotations = NULL;
2044 int runtime_invisible_parameter_annotations_length = 0;
2045 u1* runtime_visible_type_annotations = NULL;
2046 int runtime_visible_type_annotations_length = 0;
2047 u1* runtime_invisible_type_annotations = NULL;
2048 int runtime_invisible_type_annotations_length = 0;
2049 u1* annotation_default = NULL;
2050 int annotation_default_length = 0;
2051
2052 // Parse code and exceptions attribute
2053 u2 method_attributes_count = cfs->get_u2_fast();
2054 while (method_attributes_count--) {
2055 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2056 u2 method_attribute_name_index = cfs->get_u2_fast();
2057 u4 method_attribute_length = cfs->get_u4_fast();
2058 check_property(
2059 valid_symbol_at(method_attribute_name_index),
2060 "Invalid method attribute name index %u in class file %s",
2061 method_attribute_name_index, CHECK_(nullHandle));
2062
2063 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2064 if (method_attribute_name == vmSymbols::tag_code()) {
2065 // Parse Code attribute
2066 if (_need_verify) {
2067 guarantee_property(
2068 !access_flags.is_native() && !access_flags.is_abstract(),
2069 "Code attribute in native or abstract methods in class file %s",
2070 CHECK_(nullHandle));
2071 }
2072 if (parsed_code_attribute) {
2073 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2074 }
2075 parsed_code_attribute = true;
2076
2077 // Stack size, locals size, and code size
2078 if (_major_version == 45 && _minor_version <= 2) {
2079 cfs->guarantee_more(4, CHECK_(nullHandle));
2080 max_stack = cfs->get_u1_fast();
2081 max_locals = cfs->get_u1_fast();
2082 code_length = cfs->get_u2_fast();
2083 } else {
2084 cfs->guarantee_more(8, CHECK_(nullHandle));
2085 max_stack = cfs->get_u2_fast();
2086 max_locals = cfs->get_u2_fast();
2087 code_length = cfs->get_u4_fast();
2088 }
2089 if (_need_verify) {
2090 guarantee_property(args_size <= max_locals,
2091 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2092 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2093 "Invalid method Code length %u in class file %s",
2094 code_length, CHECK_(nullHandle));
2095 }
2096 // Code pointer
2097 code_start = cfs->get_u1_buffer();
2098 assert(code_start != NULL, "null code start");
2099 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2100 cfs->skip_u1_fast(code_length);
2101
2102 // Exception handler table
2103 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2104 exception_table_length = cfs->get_u2_fast();
2105 if (exception_table_length > 0) {
2106 exception_table_start =
2107 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2108 }
2109
2110 // Parse additional attributes in code attribute
2111 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2112 u2 code_attributes_count = cfs->get_u2_fast();
2113
2114 unsigned int calculated_attribute_length = 0;
2115
2116 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2117 calculated_attribute_length =
2118 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2119 } else {
2120 // max_stack, locals and length are smaller in pre-version 45.2 classes
2121 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2122 }
2123 calculated_attribute_length +=
2124 code_length +
2125 sizeof(exception_table_length) +
2126 sizeof(code_attributes_count) +
2127 exception_table_length *
2128 ( sizeof(u2) + // start_pc
2129 sizeof(u2) + // end_pc
2130 sizeof(u2) + // handler_pc
2131 sizeof(u2) ); // catch_type_index
2132
2133 while (code_attributes_count--) {
2134 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2135 u2 code_attribute_name_index = cfs->get_u2_fast();
2136 u4 code_attribute_length = cfs->get_u4_fast();
2137 calculated_attribute_length += code_attribute_length +
2138 sizeof(code_attribute_name_index) +
2139 sizeof(code_attribute_length);
2140 check_property(valid_symbol_at(code_attribute_name_index),
2141 "Invalid code attribute name index %u in class file %s",
2142 code_attribute_name_index,
2143 CHECK_(nullHandle));
2144 if (LoadLineNumberTables &&
2145 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2146 // Parse and compress line number table
2147 parse_linenumber_table(code_attribute_length, code_length,
2148 &linenumber_table, CHECK_(nullHandle));
2149
2150 } else if (LoadLocalVariableTables &&
2151 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2152 // Parse local variable table
2153 if (!lvt_allocated) {
2154 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2155 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2156 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2157 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2158 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2159 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2160 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2161 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2162 lvt_allocated = true;
2163 }
2164 if (lvt_cnt == max_lvt_cnt) {
2165 max_lvt_cnt <<= 1;
2166 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2167 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2168 }
2169 localvariable_table_start[lvt_cnt] =
2170 parse_localvariable_table(code_length,
2171 max_locals,
2172 code_attribute_length,
2173 &localvariable_table_length[lvt_cnt],
2174 false, // is not LVTT
2175 CHECK_(nullHandle));
2176 total_lvt_length += localvariable_table_length[lvt_cnt];
2177 lvt_cnt++;
2178 } else if (LoadLocalVariableTypeTables &&
2179 _major_version >= JAVA_1_5_VERSION &&
2180 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2181 if (!lvt_allocated) {
2182 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2183 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2184 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2185 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2186 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2187 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2188 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2189 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2190 lvt_allocated = true;
2191 }
2192 // Parse local variable type table
2193 if (lvtt_cnt == max_lvtt_cnt) {
2194 max_lvtt_cnt <<= 1;
2195 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2196 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2197 }
2198 localvariable_type_table_start[lvtt_cnt] =
2199 parse_localvariable_table(code_length,
2200 max_locals,
2201 code_attribute_length,
2202 &localvariable_type_table_length[lvtt_cnt],
2203 true, // is LVTT
2204 CHECK_(nullHandle));
2205 lvtt_cnt++;
2206 } else if (UseSplitVerifier &&
2207 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2208 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2209 // Stack map is only needed by the new verifier in JDK1.5.
2210 if (parsed_stackmap_attribute) {
2211 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2212 }
2213 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2214 stackmap_data_length = code_attribute_length;
2215 parsed_stackmap_attribute = true;
2216 } else {
2217 // Skip unknown attributes
2218 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2219 }
2220 }
2221 // check method attribute length
2222 if (_need_verify) {
2223 guarantee_property(method_attribute_length == calculated_attribute_length,
2224 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2225 }
2226 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2227 // Parse Exceptions attribute
2228 if (parsed_checked_exceptions_attribute) {
2229 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2230 }
2231 parsed_checked_exceptions_attribute = true;
2232 checked_exceptions_start =
2233 parse_checked_exceptions(&checked_exceptions_length,
2234 method_attribute_length,
2235 CHECK_(nullHandle));
2236 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2237 // reject multiple method parameters
2238 if (method_parameters_seen) {
2239 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2240 }
2241 method_parameters_seen = true;
2242 method_parameters_length = cfs->get_u1_fast();
2243 // Track the actual size (note: this is written for clarity; a
2244 // decent compiler will CSE and constant-fold this into a single
2245 // expression)
2246 // Use the attribute length to figure out the size of flags
2247 if (method_attribute_length == (method_parameters_length * 6u) + 1u) {
2248 method_parameters_four_byte_flags = true;
2249 } else if (method_attribute_length == (method_parameters_length * 4u) + 1u) {
2250 method_parameters_four_byte_flags = false;
2251 } else {
2252 classfile_parse_error(
2253 "Invalid MethodParameters method attribute length %u in class file",
2254 method_attribute_length, CHECK_(nullHandle));
2255 }
2256 method_parameters_data = cfs->get_u1_buffer();
2257 cfs->skip_u2_fast(method_parameters_length);
2258 if (method_parameters_four_byte_flags) {
2259 cfs->skip_u4_fast(method_parameters_length);
2260 } else {
2261 cfs->skip_u2_fast(method_parameters_length);
2262 }
2263 // ignore this attribute if it cannot be reflected
2264 if (!SystemDictionary::Parameter_klass_loaded())
2265 method_parameters_length = 0;
2266 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2267 if (method_attribute_length != 0) {
2268 classfile_parse_error(
2269 "Invalid Synthetic method attribute length %u in class file %s",
2270 method_attribute_length, CHECK_(nullHandle));
2271 }
2272 // Should we check that there hasn't already been a synthetic attribute?
2273 access_flags.set_is_synthetic();
2274 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2275 if (method_attribute_length != 0) {
2276 classfile_parse_error(
2277 "Invalid Deprecated method attribute length %u in class file %s",
2278 method_attribute_length, CHECK_(nullHandle));
2279 }
2280 } else if (_major_version >= JAVA_1_5_VERSION) {
2281 if (method_attribute_name == vmSymbols::tag_signature()) {
2282 if (method_attribute_length != 2) {
2283 classfile_parse_error(
2284 "Invalid Signature attribute length %u in class file %s",
2285 method_attribute_length, CHECK_(nullHandle));
2286 }
2287 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2288 generic_signature_index = cfs->get_u2_fast();
2289 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2290 runtime_visible_annotations_length = method_attribute_length;
2291 runtime_visible_annotations = cfs->get_u1_buffer();
2292 assert(runtime_visible_annotations != NULL, "null visible annotations");
2293 parse_annotations(runtime_visible_annotations,
2294 runtime_visible_annotations_length, &parsed_annotations,
2295 CHECK_(nullHandle));
2296 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2297 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2298 runtime_invisible_annotations_length = method_attribute_length;
2299 runtime_invisible_annotations = cfs->get_u1_buffer();
2300 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2301 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2302 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2303 runtime_visible_parameter_annotations_length = method_attribute_length;
2304 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2305 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2306 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2307 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2308 runtime_invisible_parameter_annotations_length = method_attribute_length;
2309 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2310 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2311 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2312 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2313 annotation_default_length = method_attribute_length;
2314 annotation_default = cfs->get_u1_buffer();
2315 assert(annotation_default != NULL, "null annotation default");
2316 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2317 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2318 runtime_visible_type_annotations_length = method_attribute_length;
2319 runtime_visible_type_annotations = cfs->get_u1_buffer();
2320 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2321 // No need for the VM to parse Type annotations
2322 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2323 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2324 runtime_invisible_type_annotations_length = method_attribute_length;
2325 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2326 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2327 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2328 } else {
2329 // Skip unknown attributes
2330 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2331 }
2332 } else {
2333 // Skip unknown attributes
2334 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2335 }
2336 }
2337
2338 if (linenumber_table != NULL) {
2339 linenumber_table->write_terminator();
2340 linenumber_table_length = linenumber_table->position();
2341 }
2342
2343 // Make sure there's at least one Code attribute in non-native/non-abstract method
2344 if (_need_verify) {
2345 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2346 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2347 }
2348
2349 // All sizing information for a Method* is finally available, now create it
2350 InlineTableSizes sizes(
2351 total_lvt_length,
2352 linenumber_table_length,
2353 exception_table_length,
2354 checked_exceptions_length,
2355 method_parameters_length,
2356 generic_signature_index,
2357 runtime_visible_annotations_length +
2358 runtime_invisible_annotations_length,
2359 runtime_visible_parameter_annotations_length +
2360 runtime_invisible_parameter_annotations_length,
2361 runtime_visible_type_annotations_length +
2362 runtime_invisible_type_annotations_length,
2363 annotation_default_length,
2364 0);
2365
2366 Method* m = Method::allocate(
2367 _loader_data, code_length, access_flags, &sizes,
2368 ConstMethod::NORMAL, CHECK_(nullHandle));
2369
2370 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2371
2372 // Fill in information from fixed part (access_flags already set)
2373 m->set_constants(_cp);
2374 m->set_name_index(name_index);
2375 m->set_signature_index(signature_index);
2376 #ifdef CC_INTERP
2377 // hmm is there a gc issue here??
2378 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2379 m->set_result_index(rtf.type());
2380 #endif
2381
2382 if (args_size >= 0) {
2383 m->set_size_of_parameters(args_size);
2384 } else {
2385 m->compute_size_of_parameters(THREAD);
2386 }
2387 #ifdef ASSERT
2388 if (args_size >= 0) {
2389 m->compute_size_of_parameters(THREAD);
2390 assert(args_size == m->size_of_parameters(), "");
2391 }
2392 #endif
2393
2394 // Fill in code attribute information
2395 m->set_max_stack(max_stack);
2396 m->set_max_locals(max_locals);
2397 if (stackmap_data != NULL) {
2398 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2399 stackmap_data_length, CHECK_NULL);
2400 }
2401
2402 // Copy byte codes
2403 m->set_code(code_start);
2404
2405 // Copy line number table
2406 if (linenumber_table != NULL) {
2407 memcpy(m->compressed_linenumber_table(),
2408 linenumber_table->buffer(), linenumber_table_length);
2409 }
2410
2411 // Copy exception table
2412 if (exception_table_length > 0) {
2413 int size =
2414 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2415 copy_u2_with_conversion((u2*) m->exception_table_start(),
2416 exception_table_start, size);
2417 }
2418
2419 // Copy method parameters
2420 if (method_parameters_length > 0) {
2421 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2422 for (int i = 0; i < method_parameters_length; i++) {
2423 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2424 method_parameters_data += 2;
2425 if (method_parameters_four_byte_flags) {
2426 elem[i].flags = Bytes::get_Java_u4(method_parameters_data);
2427 method_parameters_data += 4;
2428 } else {
2429 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2430 method_parameters_data += 2;
2431 }
2432 }
2433 }
2434
2435 // Copy checked exceptions
2436 if (checked_exceptions_length > 0) {
2437 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2438 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2439 }
2440
2441 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2442 if (total_lvt_length > 0) {
2443 promoted_flags->set_has_localvariable_table();
2444 copy_localvariable_table(m->constMethod(), lvt_cnt,
2445 localvariable_table_length,
2446 localvariable_table_start,
2447 lvtt_cnt,
2448 localvariable_type_table_length,
2449 localvariable_type_table_start, CHECK_NULL);
2450 }
2451
2452 if (parsed_annotations.has_any_annotations())
2453 parsed_annotations.apply_to(m);
2454
2455 // Copy annotations
2456 copy_method_annotations(m->constMethod(),
2457 runtime_visible_annotations,
2458 runtime_visible_annotations_length,
2459 runtime_invisible_annotations,
2460 runtime_invisible_annotations_length,
2461 runtime_visible_parameter_annotations,
2462 runtime_visible_parameter_annotations_length,
2463 runtime_invisible_parameter_annotations,
2464 runtime_invisible_parameter_annotations_length,
2465 runtime_visible_type_annotations,
2466 runtime_visible_type_annotations_length,
2467 runtime_invisible_type_annotations,
2468 runtime_invisible_type_annotations_length,
2469 annotation_default,
2470 annotation_default_length,
2471 CHECK_NULL);
2472
2473 if (name == vmSymbols::finalize_method_name() &&
2474 signature == vmSymbols::void_method_signature()) {
2475 if (m->is_empty_method()) {
2476 _has_empty_finalizer = true;
2477 } else {
2478 _has_finalizer = true;
2479 }
2480 }
2481 if (name == vmSymbols::object_initializer_name() &&
2482 signature == vmSymbols::void_method_signature() &&
2483 m->is_vanilla_constructor()) {
2484 _has_vanilla_constructor = true;
2485 }
2486
2487 NOT_PRODUCT(m->verify());
2488 return m;
2489 }
2490
2491
2492 // The promoted_flags parameter is used to pass relevant access_flags
2493 // from the methods back up to the containing klass. These flag values
2494 // are added to klass's access_flags.
2495
2496 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2497 AccessFlags* promoted_flags,
2498 bool* has_final_method,
2499 bool* has_default_methods,
2500 TRAPS) {
2501 ClassFileStream* cfs = stream();
2502 cfs->guarantee_more(2, CHECK_NULL); // length
2503 u2 length = cfs->get_u2_fast();
2504 if (length == 0) {
2505 _methods = Universe::the_empty_method_array();
2506 } else {
2507 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2508
2509 HandleMark hm(THREAD);
2510 for (int index = 0; index < length; index++) {
2511 methodHandle method = parse_method(is_interface,
2512 promoted_flags,
2513 CHECK_NULL);
2514
2515 if (method->is_final()) {
2516 *has_final_method = true;
2517 }
2518 if (is_interface && !method->is_abstract() && !method->is_static()) {
2519 // default method
2520 *has_default_methods = true;
2521 }
2522 _methods->at_put(index, method());
2523 }
2524
2525 if (_need_verify && length > 1) {
2526 // Check duplicated methods
2527 ResourceMark rm(THREAD);
2528 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2529 THREAD, NameSigHash*, HASH_ROW_SIZE);
2530 initialize_hashtable(names_and_sigs);
2531 bool dup = false;
2532 {
2533 debug_only(No_Safepoint_Verifier nsv;)
2534 for (int i = 0; i < length; i++) {
2535 Method* m = _methods->at(i);
2536 // If no duplicates, add name/signature in hashtable names_and_sigs.
2537 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2538 dup = true;
2539 break;
2540 }
2541 }
2542 }
2543 if (dup) {
2544 classfile_parse_error("Duplicate method name&signature in class file %s",
2545 CHECK_NULL);
2546 }
2547 }
2548 }
2549 return _methods;
2550 }
2551
2552
2553 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2554 int length = methods->length();
2555 // If JVMTI original method ordering or sharing is enabled we have to
2556 // remember the original class file ordering.
2557 // We temporarily use the vtable_index field in the Method* to store the
2558 // class file index, so we can read in after calling qsort.
2559 // Put the method ordering in the shared archive.
2560 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2561 for (int index = 0; index < length; index++) {
2562 Method* m = methods->at(index);
2563 assert(!m->valid_vtable_index(), "vtable index should not be set");
2564 m->set_vtable_index(index);
2565 }
2566 }
2567 // Sort method array by ascending method name (for faster lookups & vtable construction)
2568 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2569 Method::sort_methods(methods);
2570
2571 intArray* method_ordering = NULL;
2572 // If JVMTI original method ordering or sharing is enabled construct int
2573 // array remembering the original ordering
2574 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2575 method_ordering = new intArray(length);
2576 for (int index = 0; index < length; index++) {
2577 Method* m = methods->at(index);
2578 int old_index = m->vtable_index();
2579 assert(old_index >= 0 && old_index < length, "invalid method index");
2580 method_ordering->at_put(index, old_index);
2581 m->set_vtable_index(Method::invalid_vtable_index);
2582 }
2583 }
2584 return method_ordering;
2585 }
2586
2587
2588 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2589 ClassFileStream* cfs = stream();
2590 cfs->guarantee_more(2, CHECK); // sourcefile_index
2591 u2 sourcefile_index = cfs->get_u2_fast();
2592 check_property(
2593 valid_symbol_at(sourcefile_index),
2594 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2595 sourcefile_index, CHECK);
2596 set_class_sourcefile(_cp->symbol_at(sourcefile_index));
2597 }
2598
2599
2600
2601 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2602 ClassFileStream* cfs = stream();
2603 u1* sde_buffer = cfs->get_u1_buffer();
2604 assert(sde_buffer != NULL, "null sde buffer");
2605
2606 // Don't bother storing it if there is no way to retrieve it
2607 if (JvmtiExport::can_get_source_debug_extension()) {
2608 assert((length+1) > length, "Overflow checking");
2609 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2610 for (int i = 0; i < length; i++) {
2611 sde[i] = sde_buffer[i];
2612 }
2613 sde[length] = '\0';
2614 set_class_sde_buffer((char*)sde, length);
2615 }
2616 // Got utf8 string, set stream position forward
2617 cfs->skip_u1(length, CHECK);
2618 }
2619
2620
2621 // Inner classes can be static, private or protected (classic VM does this)
2622 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2623
2624 // Return number of classes in the inner classes attribute table
2625 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2626 bool parsed_enclosingmethod_attribute,
2627 u2 enclosing_method_class_index,
2628 u2 enclosing_method_method_index,
2629 TRAPS) {
2630 ClassFileStream* cfs = stream();
2631 u1* current_mark = cfs->current();
2632 u2 length = 0;
2633 if (inner_classes_attribute_start != NULL) {
2634 cfs->set_current(inner_classes_attribute_start);
2635 cfs->guarantee_more(2, CHECK_0); // length
2636 length = cfs->get_u2_fast();
2637 }
2638
2639 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2640 // method data:
2641 // [inner_class_info_index,
2642 // outer_class_info_index,
2643 // inner_name_index,
2644 // inner_class_access_flags,
2645 // ...
2646 // enclosing_method_class_index,
2647 // enclosing_method_method_index]
2648 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2649 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2650 _inner_classes = inner_classes;
2651
2652 int index = 0;
2653 int cp_size = _cp->length();
2654 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2655 for (int n = 0; n < length; n++) {
2656 // Inner class index
2657 u2 inner_class_info_index = cfs->get_u2_fast();
2658 check_property(
2659 inner_class_info_index == 0 ||
2660 valid_klass_reference_at(inner_class_info_index),
2661 "inner_class_info_index %u has bad constant type in class file %s",
2662 inner_class_info_index, CHECK_0);
2663 // Outer class index
2664 u2 outer_class_info_index = cfs->get_u2_fast();
2665 check_property(
2666 outer_class_info_index == 0 ||
2667 valid_klass_reference_at(outer_class_info_index),
2668 "outer_class_info_index %u has bad constant type in class file %s",
2669 outer_class_info_index, CHECK_0);
2670 // Inner class name
2671 u2 inner_name_index = cfs->get_u2_fast();
2672 check_property(
2673 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2674 "inner_name_index %u has bad constant type in class file %s",
2675 inner_name_index, CHECK_0);
2676 if (_need_verify) {
2677 guarantee_property(inner_class_info_index != outer_class_info_index,
2678 "Class is both outer and inner class in class file %s", CHECK_0);
2679 }
2680 // Access flags
2681 AccessFlags inner_access_flags;
2682 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2683 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2684 // Set abstract bit for old class files for backward compatibility
2685 flags |= JVM_ACC_ABSTRACT;
2686 }
2687 verify_legal_class_modifiers(flags, CHECK_0);
2688 inner_access_flags.set_flags(flags);
2689
2690 inner_classes->at_put(index++, inner_class_info_index);
2691 inner_classes->at_put(index++, outer_class_info_index);
2692 inner_classes->at_put(index++, inner_name_index);
2693 inner_classes->at_put(index++, inner_access_flags.as_short());
2694 }
2695
2696 // 4347400: make sure there's no duplicate entry in the classes array
2697 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2698 for(int i = 0; i < length * 4; i += 4) {
2699 for(int j = i + 4; j < length * 4; j += 4) {
2700 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2701 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2702 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2703 inner_classes->at(i+3) != inner_classes->at(j+3)),
2704 "Duplicate entry in InnerClasses in class file %s",
2705 CHECK_0);
2706 }
2707 }
2708 }
2709
2710 // Set EnclosingMethod class and method indexes.
2711 if (parsed_enclosingmethod_attribute) {
2712 inner_classes->at_put(index++, enclosing_method_class_index);
2713 inner_classes->at_put(index++, enclosing_method_method_index);
2714 }
2715 assert(index == size, "wrong size");
2716
2717 // Restore buffer's current position.
2718 cfs->set_current(current_mark);
2719
2720 return length;
2721 }
2722
2723 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2724 set_class_synthetic_flag(true);
2725 }
2726
2727 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2728 ClassFileStream* cfs = stream();
2729 u2 signature_index = cfs->get_u2(CHECK);
2730 check_property(
2731 valid_symbol_at(signature_index),
2732 "Invalid constant pool index %u in Signature attribute in class file %s",
2733 signature_index, CHECK);
2734 set_class_generic_signature(_cp->symbol_at(signature_index));
2735 }
2736
2737 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2738 ClassFileStream* cfs = stream();
2739 u1* current_start = cfs->current();
2740
2741 cfs->guarantee_more(2, CHECK); // length
2742 int attribute_array_length = cfs->get_u2_fast();
2743
2744 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2745 "Short length on BootstrapMethods in class file %s",
2746 CHECK);
2747
2748 // The attribute contains a counted array of counted tuples of shorts,
2749 // represending bootstrap specifiers:
2750 // length*{bootstrap_method_index, argument_count*{argument_index}}
2751 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2752 // operand_count = number of shorts in attr, except for leading length
2753
2754 // The attribute is copied into a short[] array.
2755 // The array begins with a series of short[2] pairs, one for each tuple.
2756 int index_size = (attribute_array_length * 2);
2757
2758 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2759
2760 // Eagerly assign operands so they will be deallocated with the constant
2761 // pool if there is an error.
2762 _cp->set_operands(operands);
2763
2764 int operand_fill_index = index_size;
2765 int cp_size = _cp->length();
2766
2767 for (int n = 0; n < attribute_array_length; n++) {
2768 // Store a 32-bit offset into the header of the operand array.
2769 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2770
2771 // Read a bootstrap specifier.
2772 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2773 u2 bootstrap_method_index = cfs->get_u2_fast();
2774 u2 argument_count = cfs->get_u2_fast();
2775 check_property(
2776 valid_cp_range(bootstrap_method_index, cp_size) &&
2777 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2778 "bootstrap_method_index %u has bad constant type in class file %s",
2779 bootstrap_method_index,
2780 CHECK);
2781 operands->at_put(operand_fill_index++, bootstrap_method_index);
2782 operands->at_put(operand_fill_index++, argument_count);
2783
2784 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2785 for (int j = 0; j < argument_count; j++) {
2786 u2 argument_index = cfs->get_u2_fast();
2787 check_property(
2788 valid_cp_range(argument_index, cp_size) &&
2789 _cp->tag_at(argument_index).is_loadable_constant(),
2790 "argument_index %u has bad constant type in class file %s",
2791 argument_index,
2792 CHECK);
2793 operands->at_put(operand_fill_index++, argument_index);
2794 }
2795 }
2796
2797 assert(operand_fill_index == operands->length(), "exact fill");
2798 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2799
2800 u1* current_end = cfs->current();
2801 guarantee_property(current_end == current_start + attribute_byte_length,
2802 "Bad length on BootstrapMethods in class file %s",
2803 CHECK);
2804 }
2805
2806 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2807 TRAPS) {
2808 ClassFileStream* cfs = stream();
2809 // Set inner classes attribute to default sentinel
2810 _inner_classes = Universe::the_empty_short_array();
2811 cfs->guarantee_more(2, CHECK); // attributes_count
2812 u2 attributes_count = cfs->get_u2_fast();
2813 bool parsed_sourcefile_attribute = false;
2814 bool parsed_innerclasses_attribute = false;
2815 bool parsed_enclosingmethod_attribute = false;
2816 bool parsed_bootstrap_methods_attribute = false;
2817 u1* runtime_visible_annotations = NULL;
2818 int runtime_visible_annotations_length = 0;
2819 u1* runtime_invisible_annotations = NULL;
2820 int runtime_invisible_annotations_length = 0;
2821 u1* runtime_visible_type_annotations = NULL;
2822 int runtime_visible_type_annotations_length = 0;
2823 u1* runtime_invisible_type_annotations = NULL;
2824 int runtime_invisible_type_annotations_length = 0;
2825 u1* inner_classes_attribute_start = NULL;
2826 u4 inner_classes_attribute_length = 0;
2827 u2 enclosing_method_class_index = 0;
2828 u2 enclosing_method_method_index = 0;
2829 // Iterate over attributes
2830 while (attributes_count--) {
2831 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2832 u2 attribute_name_index = cfs->get_u2_fast();
2833 u4 attribute_length = cfs->get_u4_fast();
2834 check_property(
2835 valid_symbol_at(attribute_name_index),
2836 "Attribute name has bad constant pool index %u in class file %s",
2837 attribute_name_index, CHECK);
2838 Symbol* tag = _cp->symbol_at(attribute_name_index);
2839 if (tag == vmSymbols::tag_source_file()) {
2840 // Check for SourceFile tag
2841 if (_need_verify) {
2842 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2843 }
2844 if (parsed_sourcefile_attribute) {
2845 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2846 } else {
2847 parsed_sourcefile_attribute = true;
2848 }
2849 parse_classfile_sourcefile_attribute(CHECK);
2850 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2851 // Check for SourceDebugExtension tag
2852 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2853 } else if (tag == vmSymbols::tag_inner_classes()) {
2854 // Check for InnerClasses tag
2855 if (parsed_innerclasses_attribute) {
2856 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2857 } else {
2858 parsed_innerclasses_attribute = true;
2859 }
2860 inner_classes_attribute_start = cfs->get_u1_buffer();
2861 inner_classes_attribute_length = attribute_length;
2862 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2863 } else if (tag == vmSymbols::tag_synthetic()) {
2864 // Check for Synthetic tag
2865 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2866 if (attribute_length != 0) {
2867 classfile_parse_error(
2868 "Invalid Synthetic classfile attribute length %u in class file %s",
2869 attribute_length, CHECK);
2870 }
2871 parse_classfile_synthetic_attribute(CHECK);
2872 } else if (tag == vmSymbols::tag_deprecated()) {
2873 // Check for Deprecatd tag - 4276120
2874 if (attribute_length != 0) {
2875 classfile_parse_error(
2876 "Invalid Deprecated classfile attribute length %u in class file %s",
2877 attribute_length, CHECK);
2878 }
2879 } else if (_major_version >= JAVA_1_5_VERSION) {
2880 if (tag == vmSymbols::tag_signature()) {
2881 if (attribute_length != 2) {
2882 classfile_parse_error(
2883 "Wrong Signature attribute length %u in class file %s",
2884 attribute_length, CHECK);
2885 }
2886 parse_classfile_signature_attribute(CHECK);
2887 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2888 runtime_visible_annotations_length = attribute_length;
2889 runtime_visible_annotations = cfs->get_u1_buffer();
2890 assert(runtime_visible_annotations != NULL, "null visible annotations");
2891 parse_annotations(runtime_visible_annotations,
2892 runtime_visible_annotations_length,
2893 parsed_annotations,
2894 CHECK);
2895 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2896 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2897 runtime_invisible_annotations_length = attribute_length;
2898 runtime_invisible_annotations = cfs->get_u1_buffer();
2899 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2900 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2901 } else if (tag == vmSymbols::tag_enclosing_method()) {
2902 if (parsed_enclosingmethod_attribute) {
2903 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2904 } else {
2905 parsed_enclosingmethod_attribute = true;
2906 }
2907 cfs->guarantee_more(4, CHECK); // class_index, method_index
2908 enclosing_method_class_index = cfs->get_u2_fast();
2909 enclosing_method_method_index = cfs->get_u2_fast();
2910 if (enclosing_method_class_index == 0) {
2911 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2912 }
2913 // Validate the constant pool indices and types
2914 check_property(valid_klass_reference_at(enclosing_method_class_index),
2915 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2916 if (enclosing_method_method_index != 0 &&
2917 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2918 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2919 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2920 }
2921 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2922 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2923 if (parsed_bootstrap_methods_attribute)
2924 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2925 parsed_bootstrap_methods_attribute = true;
2926 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2927 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2928 runtime_visible_type_annotations_length = attribute_length;
2929 runtime_visible_type_annotations = cfs->get_u1_buffer();
2930 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2931 // No need for the VM to parse Type annotations
2932 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2933 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2934 runtime_invisible_type_annotations_length = attribute_length;
2935 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2936 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2937 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2938 } else {
2939 // Unknown attribute
2940 cfs->skip_u1(attribute_length, CHECK);
2941 }
2942 } else {
2943 // Unknown attribute
2944 cfs->skip_u1(attribute_length, CHECK);
2945 }
2946 }
2947 _annotations = assemble_annotations(runtime_visible_annotations,
2948 runtime_visible_annotations_length,
2949 runtime_invisible_annotations,
2950 runtime_invisible_annotations_length,
2951 CHECK);
2952 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
2953 runtime_visible_type_annotations_length,
2954 runtime_invisible_type_annotations,
2955 runtime_invisible_type_annotations_length,
2956 CHECK);
2957
2958 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2959 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2960 inner_classes_attribute_start,
2961 parsed_innerclasses_attribute,
2962 enclosing_method_class_index,
2963 enclosing_method_method_index,
2964 CHECK);
2965 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2966 guarantee_property(
2967 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2968 "Wrong InnerClasses attribute length in class file %s", CHECK);
2969 }
2970 }
2971
2972 if (_max_bootstrap_specifier_index >= 0) {
2973 guarantee_property(parsed_bootstrap_methods_attribute,
2974 "Missing BootstrapMethods attribute in class file %s", CHECK);
2975 }
2976 }
2977
2978 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2979 if (_synthetic_flag)
2980 k->set_is_synthetic();
2981 if (_sourcefile != NULL) {
2982 _sourcefile->increment_refcount();
2983 k->set_source_file_name(_sourcefile);
2984 }
2985 if (_generic_signature != NULL) {
2986 _generic_signature->increment_refcount();
2987 k->set_generic_signature(_generic_signature);
2988 }
2989 if (_sde_buffer != NULL) {
2990 k->set_source_debug_extension(_sde_buffer, _sde_length);
2991 }
2992 }
2993
2994 // Transfer ownership of metadata allocated to the InstanceKlass.
2995 void ClassFileParser::apply_parsed_class_metadata(
2996 instanceKlassHandle this_klass,
2997 int java_fields_count, TRAPS) {
2998 // Assign annotations if needed
2999 if (_annotations != NULL || _type_annotations != NULL ||
3000 _fields_annotations != NULL || _fields_type_annotations != NULL) {
3001 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3002 annotations->set_class_annotations(_annotations);
3003 annotations->set_class_type_annotations(_type_annotations);
3004 annotations->set_fields_annotations(_fields_annotations);
3005 annotations->set_fields_type_annotations(_fields_type_annotations);
3006 this_klass->set_annotations(annotations);
3007 }
3008
3009 _cp->set_pool_holder(this_klass());
3010 this_klass->set_constants(_cp);
3011 this_klass->set_fields(_fields, java_fields_count);
3012 this_klass->set_methods(_methods);
3013 this_klass->set_inner_classes(_inner_classes);
3014 this_klass->set_local_interfaces(_local_interfaces);
3015 this_klass->set_transitive_interfaces(_transitive_interfaces);
3016
3017 // Clear out these fields so they don't get deallocated by the destructor
3018 clear_class_metadata();
3019 }
3020
3021 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3022 int runtime_visible_annotations_length,
3023 u1* runtime_invisible_annotations,
3024 int runtime_invisible_annotations_length, TRAPS) {
3025 AnnotationArray* annotations = NULL;
3026 if (runtime_visible_annotations != NULL ||
3027 runtime_invisible_annotations != NULL) {
3028 annotations = MetadataFactory::new_array<u1>(_loader_data,
3029 runtime_visible_annotations_length +
3030 runtime_invisible_annotations_length,
3031 CHECK_(annotations));
3032 if (runtime_visible_annotations != NULL) {
3033 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3034 annotations->at_put(i, runtime_visible_annotations[i]);
3035 }
3036 }
3037 if (runtime_invisible_annotations != NULL) {
3038 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3039 int append = runtime_visible_annotations_length+i;
3040 annotations->at_put(append, runtime_invisible_annotations[i]);
3041 }
3042 }
3043 }
3044 return annotations;
3045 }
3046
3047
3048 #ifndef PRODUCT
3049 static void parseAndPrintGenericSignatures(
3050 instanceKlassHandle this_klass, TRAPS) {
3051 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3052 ResourceMark rm;
3053
3054 if (this_klass->generic_signature() != NULL) {
3055 using namespace generic;
3056 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3057
3058 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3059 spec->print_on(tty);
3060
3061 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3062 Method* m = this_klass->methods()->at(i);
3063 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3064 Symbol* sig = m->generic_signature();
3065 if (sig == NULL) {
3066 sig = m->signature();
3067 }
3068 tty->print_cr("Parsing %s", sig->as_C_string());
3069 method_spec->print_on(tty);
3070 }
3071 }
3072 }
3073 #endif // ndef PRODUCT
3074
3075
3076 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3077 TRAPS) {
3078 instanceKlassHandle super_klass;
3079 if (super_class_index == 0) {
3080 check_property(_class_name == vmSymbols::java_lang_Object(),
3081 "Invalid superclass index %u in class file %s",
3082 super_class_index,
3083 CHECK_NULL);
3084 } else {
3085 check_property(valid_klass_reference_at(super_class_index),
3086 "Invalid superclass index %u in class file %s",
3087 super_class_index,
3088 CHECK_NULL);
3089 // The class name should be legal because it is checked when parsing constant pool.
3090 // However, make sure it is not an array type.
3091 bool is_array = false;
3092 if (_cp->tag_at(super_class_index).is_klass()) {
3093 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3094 if (_need_verify)
3095 is_array = super_klass->oop_is_array();
3096 } else if (_need_verify) {
3097 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3098 }
3099 if (_need_verify) {
3100 guarantee_property(!is_array,
3101 "Bad superclass name in class file %s", CHECK_NULL);
3102 }
3103 }
3104 return super_klass;
3105 }
3106
3107
3108 // Values needed for oopmap and InstanceKlass creation
3109 class FieldLayoutInfo : public StackObj {
3110 public:
3111 int* nonstatic_oop_offsets;
3112 unsigned int* nonstatic_oop_counts;
3113 unsigned int nonstatic_oop_map_count;
3114 unsigned int total_oop_map_count;
3115 int instance_size;
3116 int nonstatic_field_size;
3117 int static_field_size;
3118 bool has_nonstatic_fields;
3119 };
3120
3121 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3122 void ClassFileParser::layout_fields(Handle class_loader,
3123 FieldAllocationCount* fac,
3124 ClassAnnotationCollector* parsed_annotations,
3125 FieldLayoutInfo* info,
3126 TRAPS) {
3127
3128 // get the padding width from the option
3129 // TODO: Ask VM about specific CPU we are running on
3130 int pad_size = ContendedPaddingWidth;
3131
3132 // Field size and offset computation
3133 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3134 #ifndef PRODUCT
3135 int orig_nonstatic_field_size = 0;
3136 #endif
3137 int next_static_oop_offset;
3138 int next_static_double_offset;
3139 int next_static_word_offset;
3140 int next_static_short_offset;
3141 int next_static_byte_offset;
3142 int next_nonstatic_oop_offset;
3143 int next_nonstatic_double_offset;
3144 int next_nonstatic_word_offset;
3145 int next_nonstatic_short_offset;
3146 int next_nonstatic_byte_offset;
3147 int next_nonstatic_type_offset;
3148 int first_nonstatic_oop_offset;
3149 int first_nonstatic_field_offset;
3150 int next_nonstatic_field_offset;
3151 int next_nonstatic_padded_offset;
3152
3153 // Count the contended fields by type.
3154 int nonstatic_contended_count = 0;
3155 FieldAllocationCount fac_contended;
3156 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3157 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3158 if (fs.is_contended()) {
3159 fac_contended.count[atype]++;
3160 if (!fs.access_flags().is_static()) {
3161 nonstatic_contended_count++;
3162 }
3163 }
3164 }
3165 int contended_count = nonstatic_contended_count;
3166
3167
3168 // Calculate the starting byte offsets
3169 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3170 next_static_double_offset = next_static_oop_offset +
3171 ((fac->count[STATIC_OOP]) * heapOopSize);
3172 if ( fac->count[STATIC_DOUBLE] &&
3173 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3174 Universe::field_type_should_be_aligned(T_LONG)) ) {
3175 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3176 }
3177
3178 next_static_word_offset = next_static_double_offset +
3179 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3180 next_static_short_offset = next_static_word_offset +
3181 ((fac->count[STATIC_WORD]) * BytesPerInt);
3182 next_static_byte_offset = next_static_short_offset +
3183 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3184
3185 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3186 nonstatic_field_size * heapOopSize;
3187
3188 // class is contended, pad before all the fields
3189 if (parsed_annotations->is_contended()) {
3190 first_nonstatic_field_offset += pad_size;
3191 }
3192
3193 next_nonstatic_field_offset = first_nonstatic_field_offset;
3194
3195 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3196 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3197 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3198 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3199 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3200
3201 bool super_has_nonstatic_fields =
3202 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3203 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3204 ((nonstatic_double_count + nonstatic_word_count +
3205 nonstatic_short_count + nonstatic_byte_count +
3206 nonstatic_oop_count) != 0);
3207
3208
3209 // Prepare list of oops for oop map generation.
3210 int* nonstatic_oop_offsets;
3211 unsigned int* nonstatic_oop_counts;
3212 unsigned int nonstatic_oop_map_count = 0;
3213
3214 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3215 THREAD, int, nonstatic_oop_count + 1);
3216 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3217 THREAD, unsigned int, nonstatic_oop_count + 1);
3218
3219 first_nonstatic_oop_offset = 0; // will be set for first oop field
3220
3221 #ifndef PRODUCT
3222 if( PrintCompactFieldsSavings ) {
3223 next_nonstatic_double_offset = next_nonstatic_field_offset +
3224 (nonstatic_oop_count * heapOopSize);
3225 if ( nonstatic_double_count > 0 ) {
3226 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3227 }
3228 next_nonstatic_word_offset = next_nonstatic_double_offset +
3229 (nonstatic_double_count * BytesPerLong);
3230 next_nonstatic_short_offset = next_nonstatic_word_offset +
3231 (nonstatic_word_count * BytesPerInt);
3232 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3233 (nonstatic_short_count * BytesPerShort);
3234 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3235 nonstatic_byte_count ), heapOopSize );
3236 orig_nonstatic_field_size = nonstatic_field_size +
3237 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3238 }
3239 #endif
3240 bool compact_fields = CompactFields;
3241 int allocation_style = FieldsAllocationStyle;
3242 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3243 assert(false, "0 <= FieldsAllocationStyle <= 2");
3244 allocation_style = 1; // Optimistic
3245 }
3246
3247 // The next classes have predefined hard-coded fields offsets
3248 // (see in JavaClasses::compute_hard_coded_offsets()).
3249 // Use default fields allocation order for them.
3250 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3251 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3252 _class_name == vmSymbols::java_lang_Class() ||
3253 _class_name == vmSymbols::java_lang_ClassLoader() ||
3254 _class_name == vmSymbols::java_lang_ref_Reference() ||
3255 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3256 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3257 _class_name == vmSymbols::java_lang_String() ||
3258 _class_name == vmSymbols::java_lang_Throwable() ||
3259 _class_name == vmSymbols::java_lang_Boolean() ||
3260 _class_name == vmSymbols::java_lang_Character() ||
3261 _class_name == vmSymbols::java_lang_Float() ||
3262 _class_name == vmSymbols::java_lang_Double() ||
3263 _class_name == vmSymbols::java_lang_Byte() ||
3264 _class_name == vmSymbols::java_lang_Short() ||
3265 _class_name == vmSymbols::java_lang_Integer() ||
3266 _class_name == vmSymbols::java_lang_Long())) {
3267 allocation_style = 0; // Allocate oops first
3268 compact_fields = false; // Don't compact fields
3269 }
3270
3271 if( allocation_style == 0 ) {
3272 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3273 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3274 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3275 (nonstatic_oop_count * heapOopSize);
3276 } else if( allocation_style == 1 ) {
3277 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3278 next_nonstatic_double_offset = next_nonstatic_field_offset;
3279 } else if( allocation_style == 2 ) {
3280 // Fields allocation: oops fields in super and sub classes are together.
3281 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3282 _super_klass->nonstatic_oop_map_size() > 0 ) {
3283 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3284 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3285 OopMapBlock* last_map = first_map + map_count - 1;
3286 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3287 if (next_offset == next_nonstatic_field_offset) {
3288 allocation_style = 0; // allocate oops first
3289 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3290 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3291 (nonstatic_oop_count * heapOopSize);
3292 }
3293 }
3294 if( allocation_style == 2 ) {
3295 allocation_style = 1; // allocate oops last
3296 next_nonstatic_double_offset = next_nonstatic_field_offset;
3297 }
3298 } else {
3299 ShouldNotReachHere();
3300 }
3301
3302 int nonstatic_oop_space_count = 0;
3303 int nonstatic_word_space_count = 0;
3304 int nonstatic_short_space_count = 0;
3305 int nonstatic_byte_space_count = 0;
3306 int nonstatic_oop_space_offset;
3307 int nonstatic_word_space_offset;
3308 int nonstatic_short_space_offset;
3309 int nonstatic_byte_space_offset;
3310
3311 if( nonstatic_double_count > 0 ) {
3312 int offset = next_nonstatic_double_offset;
3313 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3314 if( compact_fields && offset != next_nonstatic_double_offset ) {
3315 // Allocate available fields into the gap before double field.
3316 int length = next_nonstatic_double_offset - offset;
3317 assert(length == BytesPerInt, "");
3318 nonstatic_word_space_offset = offset;
3319 if( nonstatic_word_count > 0 ) {
3320 nonstatic_word_count -= 1;
3321 nonstatic_word_space_count = 1; // Only one will fit
3322 length -= BytesPerInt;
3323 offset += BytesPerInt;
3324 }
3325 nonstatic_short_space_offset = offset;
3326 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3327 nonstatic_short_count -= 1;
3328 nonstatic_short_space_count += 1;
3329 length -= BytesPerShort;
3330 offset += BytesPerShort;
3331 }
3332 nonstatic_byte_space_offset = offset;
3333 while( length > 0 && nonstatic_byte_count > 0 ) {
3334 nonstatic_byte_count -= 1;
3335 nonstatic_byte_space_count += 1;
3336 length -= 1;
3337 }
3338 // Allocate oop field in the gap if there are no other fields for that.
3339 nonstatic_oop_space_offset = offset;
3340 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3341 allocation_style != 0 ) { // when oop fields not first
3342 nonstatic_oop_count -= 1;
3343 nonstatic_oop_space_count = 1; // Only one will fit
3344 length -= heapOopSize;
3345 offset += heapOopSize;
3346 }
3347 }
3348 }
3349
3350 next_nonstatic_word_offset = next_nonstatic_double_offset +
3351 (nonstatic_double_count * BytesPerLong);
3352 next_nonstatic_short_offset = next_nonstatic_word_offset +
3353 (nonstatic_word_count * BytesPerInt);
3354 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3355 (nonstatic_short_count * BytesPerShort);
3356 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3357 nonstatic_byte_count;
3358
3359 // let oops jump before padding with this allocation style
3360 if( allocation_style == 1 ) {
3361 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3362 if( nonstatic_oop_count > 0 ) {
3363 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3364 }
3365 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3366 }
3367
3368 // Iterate over fields again and compute correct offsets.
3369 // The field allocation type was temporarily stored in the offset slot.
3370 // oop fields are located before non-oop fields (static and non-static).
3371 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3372
3373 // skip already laid out fields
3374 if (fs.is_offset_set()) continue;
3375
3376 // contended instance fields are handled below
3377 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3378
3379 int real_offset;
3380 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3381
3382 // pack the rest of the fields
3383 switch (atype) {
3384 case STATIC_OOP:
3385 real_offset = next_static_oop_offset;
3386 next_static_oop_offset += heapOopSize;
3387 break;
3388 case STATIC_BYTE:
3389 real_offset = next_static_byte_offset;
3390 next_static_byte_offset += 1;
3391 break;
3392 case STATIC_SHORT:
3393 real_offset = next_static_short_offset;
3394 next_static_short_offset += BytesPerShort;
3395 break;
3396 case STATIC_WORD:
3397 real_offset = next_static_word_offset;
3398 next_static_word_offset += BytesPerInt;
3399 break;
3400 case STATIC_DOUBLE:
3401 real_offset = next_static_double_offset;
3402 next_static_double_offset += BytesPerLong;
3403 break;
3404 case NONSTATIC_OOP:
3405 if( nonstatic_oop_space_count > 0 ) {
3406 real_offset = nonstatic_oop_space_offset;
3407 nonstatic_oop_space_offset += heapOopSize;
3408 nonstatic_oop_space_count -= 1;
3409 } else {
3410 real_offset = next_nonstatic_oop_offset;
3411 next_nonstatic_oop_offset += heapOopSize;
3412 }
3413 // Update oop maps
3414 if( nonstatic_oop_map_count > 0 &&
3415 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3416 real_offset -
3417 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3418 heapOopSize ) {
3419 // Extend current oop map
3420 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3421 } else {
3422 // Create new oop map
3423 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3424 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3425 nonstatic_oop_map_count += 1;
3426 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3427 first_nonstatic_oop_offset = real_offset;
3428 }
3429 }
3430 break;
3431 case NONSTATIC_BYTE:
3432 if( nonstatic_byte_space_count > 0 ) {
3433 real_offset = nonstatic_byte_space_offset;
3434 nonstatic_byte_space_offset += 1;
3435 nonstatic_byte_space_count -= 1;
3436 } else {
3437 real_offset = next_nonstatic_byte_offset;
3438 next_nonstatic_byte_offset += 1;
3439 }
3440 break;
3441 case NONSTATIC_SHORT:
3442 if( nonstatic_short_space_count > 0 ) {
3443 real_offset = nonstatic_short_space_offset;
3444 nonstatic_short_space_offset += BytesPerShort;
3445 nonstatic_short_space_count -= 1;
3446 } else {
3447 real_offset = next_nonstatic_short_offset;
3448 next_nonstatic_short_offset += BytesPerShort;
3449 }
3450 break;
3451 case NONSTATIC_WORD:
3452 if( nonstatic_word_space_count > 0 ) {
3453 real_offset = nonstatic_word_space_offset;
3454 nonstatic_word_space_offset += BytesPerInt;
3455 nonstatic_word_space_count -= 1;
3456 } else {
3457 real_offset = next_nonstatic_word_offset;
3458 next_nonstatic_word_offset += BytesPerInt;
3459 }
3460 break;
3461 case NONSTATIC_DOUBLE:
3462 real_offset = next_nonstatic_double_offset;
3463 next_nonstatic_double_offset += BytesPerLong;
3464 break;
3465 default:
3466 ShouldNotReachHere();
3467 }
3468 fs.set_offset(real_offset);
3469 }
3470
3471
3472 // Handle the contended cases.
3473 //
3474 // Each contended field should not intersect the cache line with another contended field.
3475 // In the absence of alignment information, we end up with pessimistically separating
3476 // the fields with full-width padding.
3477 //
3478 // Additionally, this should not break alignment for the fields, so we round the alignment up
3479 // for each field.
3480 if (contended_count > 0) {
3481
3482 // if there is at least one contended field, we need to have pre-padding for them
3483 if (nonstatic_contended_count > 0) {
3484 next_nonstatic_padded_offset += pad_size;
3485 }
3486
3487 // collect all contended groups
3488 BitMap bm(_cp->size());
3489 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3490 // skip already laid out fields
3491 if (fs.is_offset_set()) continue;
3492
3493 if (fs.is_contended()) {
3494 bm.set_bit(fs.contended_group());
3495 }
3496 }
3497
3498 int current_group = -1;
3499 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3500
3501 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3502
3503 // skip already laid out fields
3504 if (fs.is_offset_set()) continue;
3505
3506 // skip non-contended fields and fields from different group
3507 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3508
3509 // handle statics below
3510 if (fs.access_flags().is_static()) continue;
3511
3512 int real_offset;
3513 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3514
3515 switch (atype) {
3516 case NONSTATIC_BYTE:
3517 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3518 real_offset = next_nonstatic_padded_offset;
3519 next_nonstatic_padded_offset += 1;
3520 break;
3521
3522 case NONSTATIC_SHORT:
3523 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3524 real_offset = next_nonstatic_padded_offset;
3525 next_nonstatic_padded_offset += BytesPerShort;
3526 break;
3527
3528 case NONSTATIC_WORD:
3529 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3530 real_offset = next_nonstatic_padded_offset;
3531 next_nonstatic_padded_offset += BytesPerInt;
3532 break;
3533
3534 case NONSTATIC_DOUBLE:
3535 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3536 real_offset = next_nonstatic_padded_offset;
3537 next_nonstatic_padded_offset += BytesPerLong;
3538 break;
3539
3540 case NONSTATIC_OOP:
3541 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3542 real_offset = next_nonstatic_padded_offset;
3543 next_nonstatic_padded_offset += heapOopSize;
3544
3545 // Create new oop map
3546 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3547 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3548 nonstatic_oop_map_count += 1;
3549 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3550 first_nonstatic_oop_offset = real_offset;
3551 }
3552 break;
3553
3554 default:
3555 ShouldNotReachHere();
3556 }
3557
3558 if (fs.contended_group() == 0) {
3559 // Contended group defines the equivalence class over the fields:
3560 // the fields within the same contended group are not inter-padded.
3561 // The only exception is default group, which does not incur the
3562 // equivalence, and so requires intra-padding.
3563 next_nonstatic_padded_offset += pad_size;
3564 }
3565
3566 fs.set_offset(real_offset);
3567 } // for
3568
3569 // Start laying out the next group.
3570 // Note that this will effectively pad the last group in the back;
3571 // this is expected to alleviate memory contention effects for
3572 // subclass fields and/or adjacent object.
3573 // If this was the default group, the padding is already in place.
3574 if (current_group != 0) {
3575 next_nonstatic_padded_offset += pad_size;
3576 }
3577 }
3578
3579 // handle static fields
3580 }
3581
3582 // Size of instances
3583 int notaligned_offset = next_nonstatic_padded_offset;
3584
3585 // Entire class is contended, pad in the back.
3586 // This helps to alleviate memory contention effects for subclass fields
3587 // and/or adjacent object.
3588 if (parsed_annotations->is_contended()) {
3589 notaligned_offset += pad_size;
3590 }
3591
3592 int next_static_type_offset = align_size_up(next_static_byte_offset, wordSize);
3593 int static_field_size = (next_static_type_offset -
3594 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3595
3596 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3597 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3598 - first_nonstatic_field_offset)/heapOopSize);
3599
3600 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3601 int instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3602
3603 assert(instance_size == align_object_size(align_size_up(
3604 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations->is_contended()) ? pad_size : 0)),
3605 wordSize) / wordSize), "consistent layout helper value");
3606
3607 // Number of non-static oop map blocks allocated at end of klass.
3608 const unsigned int total_oop_map_count =
3609 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3610 first_nonstatic_oop_offset);
3611
3612 #ifndef PRODUCT
3613 if( PrintCompactFieldsSavings ) {
3614 ResourceMark rm;
3615 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3616 tty->print("[Saved %d of %d bytes in %s]\n",
3617 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3618 orig_nonstatic_field_size*heapOopSize,
3619 _class_name);
3620 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3621 tty->print("[Wasted %d over %d bytes in %s]\n",
3622 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3623 orig_nonstatic_field_size*heapOopSize,
3624 _class_name);
3625 }
3626 }
3627
3628 if (PrintFieldLayout) {
3629 print_field_layout(_class_name,
3630 _fields,
3631 _cp,
3632 instance_size,
3633 first_nonstatic_field_offset,
3634 next_nonstatic_field_offset,
3635 next_static_type_offset);
3636 }
3637
3638 #endif
3639 // Pass back information needed for InstanceKlass creation
3640 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3641 info->nonstatic_oop_counts = nonstatic_oop_counts;
3642 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3643 info->total_oop_map_count = total_oop_map_count;
3644 info->instance_size = instance_size;
3645 info->static_field_size = static_field_size;
3646 info->nonstatic_field_size = nonstatic_field_size;
3647 info->has_nonstatic_fields = has_nonstatic_fields;
3648 }
3649
3650
3651 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3652 ClassLoaderData* loader_data,
3653 Handle protection_domain,
3654 KlassHandle host_klass,
3655 GrowableArray<Handle>* cp_patches,
3656 TempNewSymbol& parsed_name,
3657 bool verify,
3658 TRAPS) {
3659
3660 // When a retransformable agent is attached, JVMTI caches the
3661 // class bytes that existed before the first retransformation.
3662 // If RedefineClasses() was used before the retransformable
3663 // agent attached, then the cached class bytes may not be the
3664 // original class bytes.
3665 unsigned char *cached_class_file_bytes = NULL;
3666 jint cached_class_file_length;
3667 Handle class_loader(THREAD, loader_data->class_loader());
3668 bool has_default_methods = false;
3669 ResourceMark rm(THREAD);
3670
3671 ClassFileStream* cfs = stream();
3672 // Timing
3673 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3674 JavaThread* jt = (JavaThread*) THREAD;
3675
3676 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3677 ClassLoader::perf_class_parse_selftime(),
3678 NULL,
3679 jt->get_thread_stat()->perf_recursion_counts_addr(),
3680 jt->get_thread_stat()->perf_timers_addr(),
3681 PerfClassTraceTime::PARSE_CLASS);
3682
3683 init_parsed_class_attributes(loader_data);
3684
3685 if (JvmtiExport::should_post_class_file_load_hook()) {
3686 // Get the cached class file bytes (if any) from the class that
3687 // is being redefined or retransformed. We use jvmti_thread_state()
3688 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3689 // a JvmtiThreadState any earlier than necessary. This will help
3690 // avoid the bug described by 7126851.
3691 JvmtiThreadState *state = jt->jvmti_thread_state();
3692 if (state != NULL) {
3693 KlassHandle *h_class_being_redefined =
3694 state->get_class_being_redefined();
3695 if (h_class_being_redefined != NULL) {
3696 instanceKlassHandle ikh_class_being_redefined =
3697 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3698 cached_class_file_bytes =
3699 ikh_class_being_redefined->get_cached_class_file_bytes();
3700 cached_class_file_length =
3701 ikh_class_being_redefined->get_cached_class_file_len();
3702 }
3703 }
3704
3705 unsigned char* ptr = cfs->buffer();
3706 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3707
3708 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3709 &ptr, &end_ptr,
3710 &cached_class_file_bytes,
3711 &cached_class_file_length);
3712
3713 if (ptr != cfs->buffer()) {
3714 // JVMTI agent has modified class file data.
3715 // Set new class file stream using JVMTI agent modified
3716 // class file data.
3717 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3718 set_stream(cfs);
3719 }
3720 }
3721
3722 _host_klass = host_klass;
3723 _cp_patches = cp_patches;
3724
3725 instanceKlassHandle nullHandle;
3726
3727 // Figure out whether we can skip format checking (matching classic VM behavior)
3728 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3729
3730 // Set the verify flag in stream
3731 cfs->set_verify(_need_verify);
3732
3733 // Save the class file name for easier error message printing.
3734 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3735
3736 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3737 // Magic value
3738 u4 magic = cfs->get_u4_fast();
3739 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3740 "Incompatible magic value %u in class file %s",
3741 magic, CHECK_(nullHandle));
3742
3743 // Version numbers
3744 u2 minor_version = cfs->get_u2_fast();
3745 u2 major_version = cfs->get_u2_fast();
3746
3747 // Check version numbers - we check this even with verifier off
3748 if (!is_supported_version(major_version, minor_version)) {
3749 if (name == NULL) {
3750 Exceptions::fthrow(
3751 THREAD_AND_LOCATION,
3752 vmSymbols::java_lang_UnsupportedClassVersionError(),
3753 "Unsupported major.minor version %u.%u",
3754 major_version,
3755 minor_version);
3756 } else {
3757 ResourceMark rm(THREAD);
3758 Exceptions::fthrow(
3759 THREAD_AND_LOCATION,
3760 vmSymbols::java_lang_UnsupportedClassVersionError(),
3761 "%s : Unsupported major.minor version %u.%u",
3762 name->as_C_string(),
3763 major_version,
3764 minor_version);
3765 }
3766 return nullHandle;
3767 }
3768
3769 _major_version = major_version;
3770 _minor_version = minor_version;
3771
3772
3773 // Check if verification needs to be relaxed for this class file
3774 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3775 _relax_verify = Verifier::relax_verify_for(class_loader());
3776
3777 // Constant pool
3778 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3779
3780 int cp_size = cp->length();
3781
3782 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3783
3784 // Access flags
3785 AccessFlags access_flags;
3786 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3787
3788 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3789 // Set abstract bit for old class files for backward compatibility
3790 flags |= JVM_ACC_ABSTRACT;
3791 }
3792 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3793 access_flags.set_flags(flags);
3794
3795 // This class and superclass
3796 u2 this_class_index = cfs->get_u2_fast();
3797 check_property(
3798 valid_cp_range(this_class_index, cp_size) &&
3799 cp->tag_at(this_class_index).is_unresolved_klass(),
3800 "Invalid this class index %u in constant pool in class file %s",
3801 this_class_index, CHECK_(nullHandle));
3802
3803 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3804 assert(class_name != NULL, "class_name can't be null");
3805
3806 // It's important to set parsed_name *before* resolving the super class.
3807 // (it's used for cleanup by the caller if parsing fails)
3808 parsed_name = class_name;
3809 // parsed_name is returned and can be used if there's an error, so add to
3810 // its reference count. Caller will decrement the refcount.
3811 parsed_name->increment_refcount();
3812
3813 // Update _class_name which could be null previously to be class_name
3814 _class_name = class_name;
3815
3816 // Don't need to check whether this class name is legal or not.
3817 // It has been checked when constant pool is parsed.
3818 // However, make sure it is not an array type.
3819 if (_need_verify) {
3820 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3821 "Bad class name in class file %s",
3822 CHECK_(nullHandle));
3823 }
3824
3825 Klass* preserve_this_klass; // for storing result across HandleMark
3826
3827 // release all handles when parsing is done
3828 { HandleMark hm(THREAD);
3829
3830 // Checks if name in class file matches requested name
3831 if (name != NULL && class_name != name) {
3832 ResourceMark rm(THREAD);
3833 Exceptions::fthrow(
3834 THREAD_AND_LOCATION,
3835 vmSymbols::java_lang_NoClassDefFoundError(),
3836 "%s (wrong name: %s)",
3837 name->as_C_string(),
3838 class_name->as_C_string()
3839 );
3840 return nullHandle;
3841 }
3842
3843 if (TraceClassLoadingPreorder) {
3844 tty->print("[Loading %s", name->as_klass_external_name());
3845 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3846 tty->print_cr("]");
3847 }
3848
3849 u2 super_class_index = cfs->get_u2_fast();
3850 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3851 CHECK_NULL);
3852
3853 // Interfaces
3854 u2 itfs_len = cfs->get_u2_fast();
3855 Array<Klass*>* local_interfaces =
3856 parse_interfaces(itfs_len, protection_domain, _class_name,
3857 &has_default_methods, CHECK_(nullHandle));
3858
3859 u2 java_fields_count = 0;
3860 // Fields (offsets are filled in later)
3861 FieldAllocationCount fac;
3862 Array<u2>* fields = parse_fields(class_name,
3863 access_flags.is_interface(),
3864 &fac, &java_fields_count,
3865 CHECK_(nullHandle));
3866 // Methods
3867 bool has_final_method = false;
3868 AccessFlags promoted_flags;
3869 promoted_flags.set_flags(0);
3870 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3871 &promoted_flags,
3872 &has_final_method,
3873 &has_default_methods,
3874 CHECK_(nullHandle));
3875
3876 // Additional attributes
3877 ClassAnnotationCollector parsed_annotations;
3878 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3879
3880 // Make sure this is the end of class file stream
3881 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3882
3883 // We check super class after class file is parsed and format is checked
3884 if (super_class_index > 0 && super_klass.is_null()) {
3885 Symbol* sk = cp->klass_name_at(super_class_index);
3886 if (access_flags.is_interface()) {
3887 // Before attempting to resolve the superclass, check for class format
3888 // errors not checked yet.
3889 guarantee_property(sk == vmSymbols::java_lang_Object(),
3890 "Interfaces must have java.lang.Object as superclass in class file %s",
3891 CHECK_(nullHandle));
3892 }
3893 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3894 class_loader,
3895 protection_domain,
3896 true,
3897 CHECK_(nullHandle));
3898
3899 KlassHandle kh (THREAD, k);
3900 super_klass = instanceKlassHandle(THREAD, kh());
3901 }
3902 if (super_klass.not_null()) {
3903
3904 if (super_klass->has_default_methods()) {
3905 has_default_methods = true;
3906 }
3907
3908 if (super_klass->is_interface()) {
3909 ResourceMark rm(THREAD);
3910 Exceptions::fthrow(
3911 THREAD_AND_LOCATION,
3912 vmSymbols::java_lang_IncompatibleClassChangeError(),
3913 "class %s has interface %s as super class",
3914 class_name->as_klass_external_name(),
3915 super_klass->external_name()
3916 );
3917 return nullHandle;
3918 }
3919 // Make sure super class is not final
3920 if (super_klass->is_final()) {
3921 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3922 }
3923 }
3924
3925 // save super klass for error handling.
3926 _super_klass = super_klass;
3927
3928 // Compute the transitive list of all unique interfaces implemented by this class
3929 _transitive_interfaces =
3930 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3931
3932 // sort methods
3933 intArray* method_ordering = sort_methods(methods);
3934
3935 // promote flags from parse_methods() to the klass' flags
3936 access_flags.add_promoted_flags(promoted_flags.as_int());
3937
3938 // Size of Java vtable (in words)
3939 int vtable_size = 0;
3940 int itable_size = 0;
3941 int num_miranda_methods = 0;
3942
3943 GrowableArray<Method*> all_mirandas(20);
3944
3945 klassVtable::compute_vtable_size_and_num_mirandas(
3946 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3947 access_flags, class_loader, class_name, local_interfaces,
3948 CHECK_(nullHandle));
3949
3950 // Size of Java itable (in words)
3951 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3952
3953 FieldLayoutInfo info;
3954 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3955
3956 int total_oop_map_size2 =
3957 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3958
3959 // Compute reference type
3960 ReferenceType rt;
3961 if (super_klass() == NULL) {
3962 rt = REF_NONE;
3963 } else {
3964 rt = super_klass->reference_type();
3965 }
3966
3967 // We can now create the basic Klass* for this klass
3968 _klass = InstanceKlass::allocate_instance_klass(loader_data,
3969 vtable_size,
3970 itable_size,
3971 info.static_field_size,
3972 total_oop_map_size2,
3973 rt,
3974 access_flags,
3975 name,
3976 super_klass(),
3977 !host_klass.is_null(),
3978 CHECK_(nullHandle));
3979 instanceKlassHandle this_klass (THREAD, _klass);
3980
3981 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
3982 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
3983 "sanity");
3984
3985 // Fill in information already parsed
3986 this_klass->set_should_verify_class(verify);
3987 jint lh = Klass::instance_layout_helper(info.instance_size, false);
3988 this_klass->set_layout_helper(lh);
3989 assert(this_klass->oop_is_instance(), "layout is correct");
3990 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
3991 // Not yet: supers are done below to support the new subtype-checking fields
3992 //this_klass->set_super(super_klass());
3993 this_klass->set_class_loader_data(loader_data);
3994 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
3995 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
3996 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3997
3998 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
3999
4000 if (has_final_method) {
4001 this_klass->set_has_final_method();
4002 }
4003 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4004 // The InstanceKlass::_methods_jmethod_ids cache and the
4005 // InstanceKlass::_methods_cached_itable_indices cache are
4006 // both managed on the assumption that the initial cache
4007 // size is equal to the number of methods in the class. If
4008 // that changes, then InstanceKlass::idnum_can_increment()
4009 // has to be changed accordingly.
4010 this_klass->set_initial_method_idnum(methods->length());
4011 this_klass->set_name(cp->klass_name_at(this_class_index));
4012 if (is_anonymous()) // I am well known to myself
4013 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4014
4015 this_klass->set_minor_version(minor_version);
4016 this_klass->set_major_version(major_version);
4017 this_klass->set_has_default_methods(has_default_methods);
4018
4019 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4020 // (We used to do this lazily, but now we query it in Rewriter,
4021 // which is eagerly done for every method, so we might as well do it now,
4022 // when everything is fresh in memory.)
4023 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4024 for (int j = 0; j < methods->length(); j++) {
4025 methods->at(j)->init_intrinsic_id();
4026 }
4027 }
4028
4029 if (cached_class_file_bytes != NULL) {
4030 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4031 this_klass->set_cached_class_file(cached_class_file_bytes,
4032 cached_class_file_length);
4033 }
4034
4035 // Fill in field values obtained by parse_classfile_attributes
4036 if (parsed_annotations.has_any_annotations())
4037 parsed_annotations.apply_to(this_klass);
4038 apply_parsed_class_attributes(this_klass);
4039
4040 // Miranda methods
4041 if ((num_miranda_methods > 0) ||
4042 // if this class introduced new miranda methods or
4043 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4044 // super class exists and this class inherited miranda methods
4045 ) {
4046 this_klass->set_has_miranda_methods(); // then set a flag
4047 }
4048
4049 // Fill in information needed to compute superclasses.
4050 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4051
4052 // Initialize itable offset tables
4053 klassItable::setup_itable_offset_table(this_klass);
4054
4055 // Compute transitive closure of interfaces this class implements
4056 // Do final class setup
4057 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4058
4059 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4060 set_precomputed_flags(this_klass);
4061
4062 // reinitialize modifiers, using the InnerClasses attribute
4063 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4064 this_klass->set_modifier_flags(computed_modifiers);
4065
4066 // check if this class can access its super class
4067 check_super_class_access(this_klass, CHECK_(nullHandle));
4068
4069 // check if this class can access its superinterfaces
4070 check_super_interface_access(this_klass, CHECK_(nullHandle));
4071
4072 // check if this class overrides any final method
4073 check_final_method_override(this_klass, CHECK_(nullHandle));
4074
4075 // check that if this class is an interface then it doesn't have static methods
4076 if (this_klass->is_interface()) {
4077 /* An interface in a JAVA 8 classfile can be static */
4078 if (_major_version < JAVA_8_VERSION) {
4079 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4080 }
4081 }
4082
4083
4084 #ifdef ASSERT
4085 if (ParseAllGenericSignatures) {
4086 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4087 }
4088 #endif
4089
4090 // Generate any default methods - default methods are interface methods
4091 // that have a default implementation. This is new with Lambda project.
4092 if (has_default_methods && !access_flags.is_interface() &&
4093 local_interfaces->length() > 0) {
4094 DefaultMethods::generate_default_methods(
4095 this_klass(), &all_mirandas, CHECK_(nullHandle));
4096 }
4097
4098 // Allocate mirror and initialize static fields
4099 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
4100
4101 // Allocate a simple java object for locking during class initialization.
4102 // This needs to be a java object because it can be held across a java call.
4103 typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
4104 this_klass->set_init_lock(r);
4105
4106 // TODO: Move these oops to the mirror
4107 this_klass->set_protection_domain(protection_domain());
4108
4109 // Update the loader_data graph.
4110 record_defined_class_dependencies(this_klass, CHECK_NULL);
4111
4112 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4113 false /* not shared class */);
4114
4115 if (TraceClassLoading) {
4116 ResourceMark rm;
4117 // print in a single call to reduce interleaving of output
4118 if (cfs->source() != NULL) {
4119 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4120 cfs->source());
4121 } else if (class_loader.is_null()) {
4122 if (THREAD->is_Java_thread()) {
4123 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4124 tty->print("[Loaded %s by instance of %s]\n",
4125 this_klass->external_name(),
4126 InstanceKlass::cast(caller)->external_name());
4127 } else {
4128 tty->print("[Loaded %s]\n", this_klass->external_name());
4129 }
4130 } else {
4131 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4132 InstanceKlass::cast(class_loader->klass())->external_name());
4133 }
4134 }
4135
4136 if (TraceClassResolution) {
4137 ResourceMark rm;
4138 // print out the superclass.
4139 const char * from = this_klass()->external_name();
4140 if (this_klass->java_super() != NULL) {
4141 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4142 }
4143 // print out each of the interface classes referred to by this class.
4144 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4145 if (local_interfaces != NULL) {
4146 int length = local_interfaces->length();
4147 for (int i = 0; i < length; i++) {
4148 Klass* k = local_interfaces->at(i);
4149 InstanceKlass* to_class = InstanceKlass::cast(k);
4150 const char * to = to_class->external_name();
4151 tty->print("RESOLVE %s %s (interface)\n", from, to);
4152 }
4153 }
4154 }
4155
4156 // preserve result across HandleMark
4157 preserve_this_klass = this_klass();
4158 }
4159
4160 // Create new handle outside HandleMark (might be needed for
4161 // Extended Class Redefinition)
4162 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4163 debug_only(this_klass->verify();)
4164
4165 // Clear class if no error has occurred so destructor doesn't deallocate it
4166 _klass = NULL;
4167 return this_klass;
4168 }
4169
4170 // Destructor to clean up if there's an error
4171 ClassFileParser::~ClassFileParser() {
4172 MetadataFactory::free_metadata(_loader_data, _cp);
4173 MetadataFactory::free_array<u2>(_loader_data, _fields);
4174
4175 // Free methods
4176 InstanceKlass::deallocate_methods(_loader_data, _methods);
4177
4178 // beware of the Universe::empty_blah_array!!
4179 if (_inner_classes != Universe::the_empty_short_array()) {
4180 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4181 }
4182
4183 // Free interfaces
4184 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4185 _local_interfaces, _transitive_interfaces);
4186
4187 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4188 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4189 Annotations::free_contents(_loader_data, _fields_annotations);
4190 Annotations::free_contents(_loader_data, _fields_type_annotations);
4191
4192 clear_class_metadata();
4193
4194 // deallocate the klass if already created.
4195 MetadataFactory::free_metadata(_loader_data, _klass);
4196 _klass = NULL;
4197 }
4198
4199 void ClassFileParser::print_field_layout(Symbol* name,
4200 Array<u2>* fields,
4201 constantPoolHandle cp,
4202 int instance_size,
4203 int instance_fields_start,
4204 int instance_fields_end,
4205 int static_fields_end) {
4206 tty->print("%s: field layout\n", name->as_klass_external_name());
4207 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4208 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4209 if (!fs.access_flags().is_static()) {
4210 tty->print(" @%3d \"%s\" %s\n",
4211 fs.offset(),
4212 fs.name()->as_klass_external_name(),
4213 fs.signature()->as_klass_external_name());
4214 }
4215 }
4216 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4217 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4218 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4219 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4220 if (fs.access_flags().is_static()) {
4221 tty->print(" @%3d \"%s\" %s\n",
4222 fs.offset(),
4223 fs.name()->as_klass_external_name(),
4224 fs.signature()->as_klass_external_name());
4225 }
4226 }
4227 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4228 tty->print("\n");
4229 }
4230
4231 unsigned int
4232 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4233 unsigned int nonstatic_oop_map_count,
4234 int first_nonstatic_oop_offset) {
4235 unsigned int map_count =
4236 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4237 if (nonstatic_oop_map_count > 0) {
4238 // We have oops to add to map
4239 if (map_count == 0) {
4240 map_count = nonstatic_oop_map_count;
4241 } else {
4242 // Check whether we should add a new map block or whether the last one can
4243 // be extended
4244 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4245 OopMapBlock* const last_map = first_map + map_count - 1;
4246
4247 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4248 if (next_offset == first_nonstatic_oop_offset) {
4249 // There is no gap bettwen superklass's last oop field and first
4250 // local oop field, merge maps.
4251 nonstatic_oop_map_count -= 1;
4252 } else {
4253 // Superklass didn't end with a oop field, add extra maps
4254 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4255 }
4256 map_count += nonstatic_oop_map_count;
4257 }
4258 }
4259 return map_count;
4260 }
4261
4262
4263 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4264 unsigned int nonstatic_oop_map_count,
4265 int* nonstatic_oop_offsets,
4266 unsigned int* nonstatic_oop_counts) {
4267 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4268 const InstanceKlass* const super = k->superklass();
4269 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4270 if (super_count > 0) {
4271 // Copy maps from superklass
4272 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4273 for (unsigned int i = 0; i < super_count; ++i) {
4274 *this_oop_map++ = *super_oop_map++;
4275 }
4276 }
4277
4278 if (nonstatic_oop_map_count > 0) {
4279 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4280 // The counts differ because there is no gap between superklass's last oop
4281 // field and the first local oop field. Extend the last oop map copied
4282 // from the superklass instead of creating new one.
4283 nonstatic_oop_map_count--;
4284 nonstatic_oop_offsets++;
4285 this_oop_map--;
4286 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4287 this_oop_map++;
4288 }
4289
4290 // Add new map blocks, fill them
4291 while (nonstatic_oop_map_count-- > 0) {
4292 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4293 this_oop_map->set_count(*nonstatic_oop_counts++);
4294 this_oop_map++;
4295 }
4296 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4297 this_oop_map, "sanity");
4298 }
4299 }
4300
4301
4302 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4303 Klass* super = k->super();
4304
4305 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4306 // in which case we don't have to register objects as finalizable
4307 if (!_has_empty_finalizer) {
4308 if (_has_finalizer ||
4309 (super != NULL && super->has_finalizer())) {
4310 k->set_has_finalizer();
4311 }
4312 }
4313
4314 #ifdef ASSERT
4315 bool f = false;
4316 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4317 vmSymbols::void_method_signature());
4318 if (m != NULL && !m->is_empty_method()) {
4319 f = true;
4320 }
4321 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4322 #endif
4323
4324 // Check if this klass supports the java.lang.Cloneable interface
4325 if (SystemDictionary::Cloneable_klass_loaded()) {
4326 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4327 k->set_is_cloneable();
4328 }
4329 }
4330
4331 // Check if this klass has a vanilla default constructor
4332 if (super == NULL) {
4333 // java.lang.Object has empty default constructor
4334 k->set_has_vanilla_constructor();
4335 } else {
4336 if (super->has_vanilla_constructor() &&
4337 _has_vanilla_constructor) {
4338 k->set_has_vanilla_constructor();
4339 }
4340 #ifdef ASSERT
4341 bool v = false;
4342 if (super->has_vanilla_constructor()) {
4343 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4344 ), vmSymbols::void_method_signature());
4345 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4346 v = true;
4347 }
4348 }
4349 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4350 #endif
4351 }
4352
4353 // If it cannot be fast-path allocated, set a bit in the layout helper.
4354 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4355 assert(k->size_helper() > 0, "layout_helper is initialized");
4356 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4357 || k->is_abstract() || k->is_interface()
4358 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4359 || k->size_helper() >= FastAllocateSizeLimit) {
4360 // Forbid fast-path allocation.
4361 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4362 k->set_layout_helper(lh);
4363 }
4364 }
4365
4366 // Attach super classes and interface classes to class loader data
4367 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4368 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4369 if (defining_loader_data->is_the_null_class_loader_data()) {
4370 // Dependencies to null class loader data are implicit.
4371 return;
4372 } else {
4373 // add super class dependency
4374 Klass* super = defined_klass->super();
4375 if (super != NULL) {
4376 defining_loader_data->record_dependency(super, CHECK);
4377 }
4378
4379 // add super interface dependencies
4380 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4381 if (local_interfaces != NULL) {
4382 int length = local_interfaces->length();
4383 for (int i = 0; i < length; i++) {
4384 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4385 }
4386 }
4387 }
4388 }
4389
4390 // utility methods for appending an array with check for duplicates
4391
4392 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4393 // iterate over new interfaces
4394 for (int i = 0; i < ifs->length(); i++) {
4395 Klass* e = ifs->at(i);
4396 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4397 // add new interface
4398 result->append_if_missing(e);
4399 }
4400 }
4401
4402 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4403 instanceKlassHandle super,
4404 Array<Klass*>* local_ifs, TRAPS) {
4405 // Compute maximum size for transitive interfaces
4406 int max_transitive_size = 0;
4407 int super_size = 0;
4408 // Add superclass transitive interfaces size
4409 if (super.not_null()) {
4410 super_size = super->transitive_interfaces()->length();
4411 max_transitive_size += super_size;
4412 }
4413 // Add local interfaces' super interfaces
4414 int local_size = local_ifs->length();
4415 for (int i = 0; i < local_size; i++) {
4416 Klass* l = local_ifs->at(i);
4417 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4418 }
4419 // Finally add local interfaces
4420 max_transitive_size += local_size;
4421 // Construct array
4422 if (max_transitive_size == 0) {
4423 // no interfaces, use canonicalized array
4424 return Universe::the_empty_klass_array();
4425 } else if (max_transitive_size == super_size) {
4426 // no new local interfaces added, share superklass' transitive interface array
4427 return super->transitive_interfaces();
4428 } else if (max_transitive_size == local_size) {
4429 // only local interfaces added, share local interface array
4430 return local_ifs;
4431 } else {
4432 ResourceMark rm;
4433 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4434
4435 // Copy down from superclass
4436 if (super.not_null()) {
4437 append_interfaces(result, super->transitive_interfaces());
4438 }
4439
4440 // Copy down from local interfaces' superinterfaces
4441 for (int i = 0; i < local_ifs->length(); i++) {
4442 Klass* l = local_ifs->at(i);
4443 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4444 }
4445 // Finally add local interfaces
4446 append_interfaces(result, local_ifs);
4447
4448 // length will be less than the max_transitive_size if duplicates were removed
4449 int length = result->length();
4450 assert(length <= max_transitive_size, "just checking");
4451 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4452 for (int i = 0; i < length; i++) {
4453 Klass* e = result->at(i);
4454 assert(e != NULL, "just checking");
4455 new_result->at_put(i, e);
4456 }
4457 return new_result;
4458 }
4459 }
4460
4461 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4462 Klass* super = this_klass->super();
4463 if ((super != NULL) &&
4464 (!Reflection::verify_class_access(this_klass(), super, false))) {
4465 ResourceMark rm(THREAD);
4466 Exceptions::fthrow(
4467 THREAD_AND_LOCATION,
4468 vmSymbols::java_lang_IllegalAccessError(),
4469 "class %s cannot access its superclass %s",
4470 this_klass->external_name(),
4471 InstanceKlass::cast(super)->external_name()
4472 );
4473 return;
4474 }
4475 }
4476
4477
4478 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4479 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4480 int lng = local_interfaces->length();
4481 for (int i = lng - 1; i >= 0; i--) {
4482 Klass* k = local_interfaces->at(i);
4483 assert (k != NULL && k->is_interface(), "invalid interface");
4484 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4485 ResourceMark rm(THREAD);
4486 Exceptions::fthrow(
4487 THREAD_AND_LOCATION,
4488 vmSymbols::java_lang_IllegalAccessError(),
4489 "class %s cannot access its superinterface %s",
4490 this_klass->external_name(),
4491 InstanceKlass::cast(k)->external_name()
4492 );
4493 return;
4494 }
4495 }
4496 }
4497
4498
4499 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4500 Array<Method*>* methods = this_klass->methods();
4501 int num_methods = methods->length();
4502
4503 // go thru each method and check if it overrides a final method
4504 for (int index = 0; index < num_methods; index++) {
4505 Method* m = methods->at(index);
4506
4507 // skip private, static and <init> methods
4508 if ((!m->is_private()) &&
4509 (!m->is_static()) &&
4510 (m->name() != vmSymbols::object_initializer_name())) {
4511
4512 Symbol* name = m->name();
4513 Symbol* signature = m->signature();
4514 Klass* k = this_klass->super();
4515 Method* super_m = NULL;
4516 while (k != NULL) {
4517 // skip supers that don't have final methods.
4518 if (k->has_final_method()) {
4519 // lookup a matching method in the super class hierarchy
4520 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4521 if (super_m == NULL) {
4522 break; // didn't find any match; get out
4523 }
4524
4525 if (super_m->is_final() &&
4526 // matching method in super is final
4527 (Reflection::verify_field_access(this_klass(),
4528 super_m->method_holder(),
4529 super_m->method_holder(),
4530 super_m->access_flags(), false))
4531 // this class can access super final method and therefore override
4532 ) {
4533 ResourceMark rm(THREAD);
4534 Exceptions::fthrow(
4535 THREAD_AND_LOCATION,
4536 vmSymbols::java_lang_VerifyError(),
4537 "class %s overrides final method %s.%s",
4538 this_klass->external_name(),
4539 name->as_C_string(),
4540 signature->as_C_string()
4541 );
4542 return;
4543 }
4544
4545 // continue to look from super_m's holder's super.
4546 k = super_m->method_holder()->super();
4547 continue;
4548 }
4549
4550 k = k->super();
4551 }
4552 }
4553 }
4554 }
4555
4556
4557 // assumes that this_klass is an interface
4558 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4559 assert(this_klass->is_interface(), "not an interface");
4560 Array<Method*>* methods = this_klass->methods();
4561 int num_methods = methods->length();
4562
4563 for (int index = 0; index < num_methods; index++) {
4564 Method* m = methods->at(index);
4565 // if m is static and not the init method, throw a verify error
4566 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4567 ResourceMark rm(THREAD);
4568 Exceptions::fthrow(
4569 THREAD_AND_LOCATION,
4570 vmSymbols::java_lang_VerifyError(),
4571 "Illegal static method %s in interface %s",
4572 m->name()->as_C_string(),
4573 this_klass->external_name()
4574 );
4575 return;
4576 }
4577 }
4578 }
4579
4580 // utility methods for format checking
4581
4582 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4583 if (!_need_verify) { return; }
4584
4585 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4586 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4587 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4588 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4589 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4590 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4591 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4592
4593 if ((is_abstract && is_final) ||
4594 (is_interface && !is_abstract) ||
4595 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4596 (!is_interface && major_gte_15 && is_annotation)) {
4597 ResourceMark rm(THREAD);
4598 Exceptions::fthrow(
4599 THREAD_AND_LOCATION,
4600 vmSymbols::java_lang_ClassFormatError(),
4601 "Illegal class modifiers in class %s: 0x%X",
4602 _class_name->as_C_string(), flags
4603 );
4604 return;
4605 }
4606 }
4607
4608 bool ClassFileParser::has_illegal_visibility(jint flags) {
4609 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4610 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4611 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4612
4613 return ((is_public && is_protected) ||
4614 (is_public && is_private) ||
4615 (is_protected && is_private));
4616 }
4617
4618 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4619 u2 max_version =
4620 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4621 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4622 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4623 (major <= max_version) &&
4624 ((major != max_version) ||
4625 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4626 }
4627
4628 void ClassFileParser::verify_legal_field_modifiers(
4629 jint flags, bool is_interface, TRAPS) {
4630 if (!_need_verify) { return; }
4631
4632 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4633 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4634 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4635 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4636 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4637 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4638 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4639 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4640 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4641
4642 bool is_illegal = false;
4643
4644 if (is_interface) {
4645 if (!is_public || !is_static || !is_final || is_private ||
4646 is_protected || is_volatile || is_transient ||
4647 (major_gte_15 && is_enum)) {
4648 is_illegal = true;
4649 }
4650 } else { // not interface
4651 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4652 is_illegal = true;
4653 }
4654 }
4655
4656 if (is_illegal) {
4657 ResourceMark rm(THREAD);
4658 Exceptions::fthrow(
4659 THREAD_AND_LOCATION,
4660 vmSymbols::java_lang_ClassFormatError(),
4661 "Illegal field modifiers in class %s: 0x%X",
4662 _class_name->as_C_string(), flags);
4663 return;
4664 }
4665 }
4666
4667 void ClassFileParser::verify_legal_method_modifiers(
4668 jint flags, bool is_interface, Symbol* name, TRAPS) {
4669 if (!_need_verify) { return; }
4670
4671 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4672 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4673 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4674 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4675 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4676 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4677 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4678 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4679 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4680 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4681 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4682 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4683 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4684
4685 bool is_illegal = false;
4686
4687 if (is_interface) {
4688 if (major_gte_8) {
4689 // Class file version is JAVA_8_VERSION or later Methods of
4690 // interfaces may set any of the flags except ACC_PROTECTED,
4691 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4692 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4693 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4694 (is_native || is_protected || is_final || is_synchronized) ||
4695 // If a specific method of a class or interface has its
4696 // ACC_ABSTRACT flag set, it must not have any of its
4697 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4698 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4699 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4700 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4701 (is_abstract && (is_private || is_static || is_strict))) {
4702 is_illegal = true;
4703 }
4704 } else if (major_gte_15) {
4705 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4706 if (!is_public || is_static || is_final || is_synchronized ||
4707 is_native || !is_abstract || is_strict) {
4708 is_illegal = true;
4709 }
4710 } else {
4711 // Class file version is pre-JAVA_1_5_VERSION
4712 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4713 is_illegal = true;
4714 }
4715 }
4716 } else { // not interface
4717 if (is_initializer) {
4718 if (is_static || is_final || is_synchronized || is_native ||
4719 is_abstract || (major_gte_15 && is_bridge)) {
4720 is_illegal = true;
4721 }
4722 } else { // not initializer
4723 if (is_abstract) {
4724 if ((is_final || is_native || is_private || is_static ||
4725 (major_gte_15 && (is_synchronized || is_strict)))) {
4726 is_illegal = true;
4727 }
4728 }
4729 if (has_illegal_visibility(flags)) {
4730 is_illegal = true;
4731 }
4732 }
4733 }
4734
4735 if (is_illegal) {
4736 ResourceMark rm(THREAD);
4737 Exceptions::fthrow(
4738 THREAD_AND_LOCATION,
4739 vmSymbols::java_lang_ClassFormatError(),
4740 "Method %s in class %s has illegal modifiers: 0x%X",
4741 name->as_C_string(), _class_name->as_C_string(), flags);
4742 return;
4743 }
4744 }
4745
4746 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4747 assert(_need_verify, "only called when _need_verify is true");
4748 int i = 0;
4749 int count = length >> 2;
4750 for (int k=0; k<count; k++) {
4751 unsigned char b0 = buffer[i];
4752 unsigned char b1 = buffer[i+1];
4753 unsigned char b2 = buffer[i+2];
4754 unsigned char b3 = buffer[i+3];
4755 // For an unsigned char v,
4756 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4757 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4758 unsigned char res = b0 | b0 - 1 |
4759 b1 | b1 - 1 |
4760 b2 | b2 - 1 |
4761 b3 | b3 - 1;
4762 if (res >= 128) break;
4763 i += 4;
4764 }
4765 for(; i < length; i++) {
4766 unsigned short c;
4767 // no embedded zeros
4768 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4769 if(buffer[i] < 128) {
4770 continue;
4771 }
4772 if ((i + 5) < length) { // see if it's legal supplementary character
4773 if (UTF8::is_supplementary_character(&buffer[i])) {
4774 c = UTF8::get_supplementary_character(&buffer[i]);
4775 i += 5;
4776 continue;
4777 }
4778 }
4779 switch (buffer[i] >> 4) {
4780 default: break;
4781 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4782 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4783 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4784 c = (buffer[i] & 0x1F) << 6;
4785 i++;
4786 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4787 c += buffer[i] & 0x3F;
4788 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4789 // for classes with major > 47, c must a null or a character in its shortest form
4790 break;
4791 }
4792 }
4793 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4794 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4795 c = (buffer[i] & 0xF) << 12;
4796 i += 2;
4797 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4798 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4799 if (_major_version <= 47 || c >= 0x800) {
4800 // for classes with major > 47, c must be in its shortest form
4801 break;
4802 }
4803 }
4804 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4805 } // end of switch
4806 } // end of for
4807 }
4808
4809 // Checks if name is a legal class name.
4810 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4811 if (!_need_verify || _relax_verify) { return; }
4812
4813 char buf[fixed_buffer_size];
4814 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4815 unsigned int length = name->utf8_length();
4816 bool legal = false;
4817
4818 if (length > 0) {
4819 char* p;
4820 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4821 p = skip_over_field_signature(bytes, false, length, CHECK);
4822 legal = (p != NULL) && ((p - bytes) == (int)length);
4823 } else if (_major_version < JAVA_1_5_VERSION) {
4824 if (bytes[0] != '<') {
4825 p = skip_over_field_name(bytes, true, length);
4826 legal = (p != NULL) && ((p - bytes) == (int)length);
4827 }
4828 } else {
4829 // 4900761: relax the constraints based on JSR202 spec
4830 // Class names may be drawn from the entire Unicode character set.
4831 // Identifiers between '/' must be unqualified names.
4832 // The utf8 string has been verified when parsing cpool entries.
4833 legal = verify_unqualified_name(bytes, length, LegalClass);
4834 }
4835 }
4836 if (!legal) {
4837 ResourceMark rm(THREAD);
4838 Exceptions::fthrow(
4839 THREAD_AND_LOCATION,
4840 vmSymbols::java_lang_ClassFormatError(),
4841 "Illegal class name \"%s\" in class file %s", bytes,
4842 _class_name->as_C_string()
4843 );
4844 return;
4845 }
4846 }
4847
4848 // Checks if name is a legal field name.
4849 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4850 if (!_need_verify || _relax_verify) { return; }
4851
4852 char buf[fixed_buffer_size];
4853 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4854 unsigned int length = name->utf8_length();
4855 bool legal = false;
4856
4857 if (length > 0) {
4858 if (_major_version < JAVA_1_5_VERSION) {
4859 if (bytes[0] != '<') {
4860 char* p = skip_over_field_name(bytes, false, length);
4861 legal = (p != NULL) && ((p - bytes) == (int)length);
4862 }
4863 } else {
4864 // 4881221: relax the constraints based on JSR202 spec
4865 legal = verify_unqualified_name(bytes, length, LegalField);
4866 }
4867 }
4868
4869 if (!legal) {
4870 ResourceMark rm(THREAD);
4871 Exceptions::fthrow(
4872 THREAD_AND_LOCATION,
4873 vmSymbols::java_lang_ClassFormatError(),
4874 "Illegal field name \"%s\" in class %s", bytes,
4875 _class_name->as_C_string()
4876 );
4877 return;
4878 }
4879 }
4880
4881 // Checks if name is a legal method name.
4882 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4883 if (!_need_verify || _relax_verify) { return; }
4884
4885 assert(name != NULL, "method name is null");
4886 char buf[fixed_buffer_size];
4887 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4888 unsigned int length = name->utf8_length();
4889 bool legal = false;
4890
4891 if (length > 0) {
4892 if (bytes[0] == '<') {
4893 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4894 legal = true;
4895 }
4896 } else if (_major_version < JAVA_1_5_VERSION) {
4897 char* p;
4898 p = skip_over_field_name(bytes, false, length);
4899 legal = (p != NULL) && ((p - bytes) == (int)length);
4900 } else {
4901 // 4881221: relax the constraints based on JSR202 spec
4902 legal = verify_unqualified_name(bytes, length, LegalMethod);
4903 }
4904 }
4905
4906 if (!legal) {
4907 ResourceMark rm(THREAD);
4908 Exceptions::fthrow(
4909 THREAD_AND_LOCATION,
4910 vmSymbols::java_lang_ClassFormatError(),
4911 "Illegal method name \"%s\" in class %s", bytes,
4912 _class_name->as_C_string()
4913 );
4914 return;
4915 }
4916 }
4917
4918
4919 // Checks if signature is a legal field signature.
4920 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4921 if (!_need_verify) { return; }
4922
4923 char buf[fixed_buffer_size];
4924 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4925 unsigned int length = signature->utf8_length();
4926 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4927
4928 if (p == NULL || (p - bytes) != (int)length) {
4929 throwIllegalSignature("Field", name, signature, CHECK);
4930 }
4931 }
4932
4933 // Checks if signature is a legal method signature.
4934 // Returns number of parameters
4935 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4936 if (!_need_verify) {
4937 // make sure caller's args_size will be less than 0 even for non-static
4938 // method so it will be recomputed in compute_size_of_parameters().
4939 return -2;
4940 }
4941
4942 unsigned int args_size = 0;
4943 char buf[fixed_buffer_size];
4944 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4945 unsigned int length = signature->utf8_length();
4946 char* nextp;
4947
4948 // The first character must be a '('
4949 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4950 length--;
4951 // Skip over legal field signatures
4952 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4953 while ((length > 0) && (nextp != NULL)) {
4954 args_size++;
4955 if (p[0] == 'J' || p[0] == 'D') {
4956 args_size++;
4957 }
4958 length -= nextp - p;
4959 p = nextp;
4960 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4961 }
4962 // The first non-signature thing better be a ')'
4963 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4964 length--;
4965 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4966 // All internal methods must return void
4967 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4968 return args_size;
4969 }
4970 } else {
4971 // Now we better just have a return value
4972 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4973 if (nextp && ((int)length == (nextp - p))) {
4974 return args_size;
4975 }
4976 }
4977 }
4978 }
4979 // Report error
4980 throwIllegalSignature("Method", name, signature, CHECK_0);
4981 return 0;
4982 }
4983
4984
4985 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4986 // Method names also may not contain the characters '<' or '>', unless <init>
4987 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4988 // method. Because these names have been checked as special cases before
4989 // calling this method in verify_legal_method_name.
4990 bool ClassFileParser::verify_unqualified_name(
4991 char* name, unsigned int length, int type) {
4992 jchar ch;
4993
4994 for (char* p = name; p != name + length; ) {
4995 ch = *p;
4996 if (ch < 128) {
4997 p++;
4998 if (ch == '.' || ch == ';' || ch == '[' ) {
4999 return false; // do not permit '.', ';', or '['
5000 }
5001 if (type != LegalClass && ch == '/') {
5002 return false; // do not permit '/' unless it's class name
5003 }
5004 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5005 return false; // do not permit '<' or '>' in method names
5006 }
5007 } else {
5008 char* tmp_p = UTF8::next(p, &ch);
5009 p = tmp_p;
5010 }
5011 }
5012 return true;
5013 }
5014
5015
5016 // Take pointer to a string. Skip over the longest part of the string that could
5017 // be taken as a fieldname. Allow '/' if slash_ok is true.
5018 // Return a pointer to just past the fieldname.
5019 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5020 // being true, we saw consecutive slashes (meaning we were looking for a
5021 // qualified path but found something that was badly-formed).
5022 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5023 char* p;
5024 jchar ch;
5025 jboolean last_is_slash = false;
5026 jboolean not_first_ch = false;
5027
5028 for (p = name; p != name + length; not_first_ch = true) {
5029 char* old_p = p;
5030 ch = *p;
5031 if (ch < 128) {
5032 p++;
5033 // quick check for ascii
5034 if ((ch >= 'a' && ch <= 'z') ||
5035 (ch >= 'A' && ch <= 'Z') ||
5036 (ch == '_' || ch == '$') ||
5037 (not_first_ch && ch >= '0' && ch <= '9')) {
5038 last_is_slash = false;
5039 continue;
5040 }
5041 if (slash_ok && ch == '/') {
5042 if (last_is_slash) {
5043 return NULL; // Don't permit consecutive slashes
5044 }
5045 last_is_slash = true;
5046 continue;
5047 }
5048 } else {
5049 jint unicode_ch;
5050 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5051 p = tmp_p;
5052 last_is_slash = false;
5053 // Check if ch is Java identifier start or is Java identifier part
5054 // 4672820: call java.lang.Character methods directly without generating separate tables.
5055 EXCEPTION_MARK;
5056 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5057
5058 // return value
5059 JavaValue result(T_BOOLEAN);
5060 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5061 JavaCallArguments args;
5062 args.push_int(unicode_ch);
5063
5064 // public static boolean isJavaIdentifierStart(char ch);
5065 JavaCalls::call_static(&result,
5066 klass,
5067 vmSymbols::isJavaIdentifierStart_name(),
5068 vmSymbols::int_bool_signature(),
5069 &args,
5070 THREAD);
5071
5072 if (HAS_PENDING_EXCEPTION) {
5073 CLEAR_PENDING_EXCEPTION;
5074 return 0;
5075 }
5076 if (result.get_jboolean()) {
5077 continue;
5078 }
5079
5080 if (not_first_ch) {
5081 // public static boolean isJavaIdentifierPart(char ch);
5082 JavaCalls::call_static(&result,
5083 klass,
5084 vmSymbols::isJavaIdentifierPart_name(),
5085 vmSymbols::int_bool_signature(),
5086 &args,
5087 THREAD);
5088
5089 if (HAS_PENDING_EXCEPTION) {
5090 CLEAR_PENDING_EXCEPTION;
5091 return 0;
5092 }
5093
5094 if (result.get_jboolean()) {
5095 continue;
5096 }
5097 }
5098 }
5099 return (not_first_ch) ? old_p : NULL;
5100 }
5101 return (not_first_ch) ? p : NULL;
5102 }
5103
5104
5105 // Take pointer to a string. Skip over the longest part of the string that could
5106 // be taken as a field signature. Allow "void" if void_ok.
5107 // Return a pointer to just past the signature.
5108 // Return NULL if no legal signature is found.
5109 char* ClassFileParser::skip_over_field_signature(char* signature,
5110 bool void_ok,
5111 unsigned int length,
5112 TRAPS) {
5113 unsigned int array_dim = 0;
5114 while (length > 0) {
5115 switch (signature[0]) {
5116 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5117 case JVM_SIGNATURE_BOOLEAN:
5118 case JVM_SIGNATURE_BYTE:
5119 case JVM_SIGNATURE_CHAR:
5120 case JVM_SIGNATURE_SHORT:
5121 case JVM_SIGNATURE_INT:
5122 case JVM_SIGNATURE_FLOAT:
5123 case JVM_SIGNATURE_LONG:
5124 case JVM_SIGNATURE_DOUBLE:
5125 return signature + 1;
5126 case JVM_SIGNATURE_CLASS: {
5127 if (_major_version < JAVA_1_5_VERSION) {
5128 // Skip over the class name if one is there
5129 char* p = skip_over_field_name(signature + 1, true, --length);
5130
5131 // The next character better be a semicolon
5132 if (p && (p - signature) > 1 && p[0] == ';') {
5133 return p + 1;
5134 }
5135 } else {
5136 // 4900761: For class version > 48, any unicode is allowed in class name.
5137 length--;
5138 signature++;
5139 while (length > 0 && signature[0] != ';') {
5140 if (signature[0] == '.') {
5141 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5142 }
5143 length--;
5144 signature++;
5145 }
5146 if (signature[0] == ';') { return signature + 1; }
5147 }
5148
5149 return NULL;
5150 }
5151 case JVM_SIGNATURE_ARRAY:
5152 array_dim++;
5153 if (array_dim > 255) {
5154 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5155 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5156 }
5157 // The rest of what's there better be a legal signature
5158 signature++;
5159 length--;
5160 void_ok = false;
5161 break;
5162
5163 default:
5164 return NULL;
5165 }
5166 }
5167 return NULL;
5168 }