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
94 void ClassFileParser::parse_constant_pool_entries(ClassLoaderData* loader_data, constantPoolHandle cp, int length, TRAPS) {
95 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
96 // this function (_current can be allocated in a register, with scalar
97 // replacement of aggregates). The _current pointer is copied back to
98 // stream() when this function returns. DON'T call another method within
99 // this method that uses stream().
100 ClassFileStream* cfs0 = stream();
101 ClassFileStream cfs1 = *cfs0;
102 ClassFileStream* cfs = &cfs1;
103 #ifdef ASSERT
104 assert(cfs->allocated_on_stack(),"should be local");
105 u1* old_current = cfs0->current();
106 #endif
107 Handle class_loader(THREAD, loader_data->class_loader());
108
109 // Used for batching symbol allocations.
110 const char* names[SymbolTable::symbol_alloc_batch_size];
111 int lengths[SymbolTable::symbol_alloc_batch_size];
112 int indices[SymbolTable::symbol_alloc_batch_size];
113 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
114 int names_count = 0;
115
116 // parsing Index 0 is unused
117 for (int index = 1; index < length; index++) {
118 // Each of the following case guarantees one more byte in the stream
119 // for the following tag or the access_flags following constant pool,
120 // so we don't need bounds-check for reading tag.
121 u1 tag = cfs->get_u1_fast();
122 switch (tag) {
123 case JVM_CONSTANT_Class :
124 {
125 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
126 u2 name_index = cfs->get_u2_fast();
127 cp->klass_index_at_put(index, name_index);
128 }
129 break;
130 case JVM_CONSTANT_Fieldref :
131 {
132 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
133 u2 class_index = cfs->get_u2_fast();
134 u2 name_and_type_index = cfs->get_u2_fast();
135 cp->field_at_put(index, class_index, name_and_type_index);
136 }
137 break;
138 case JVM_CONSTANT_Methodref :
139 {
140 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
141 u2 class_index = cfs->get_u2_fast();
142 u2 name_and_type_index = cfs->get_u2_fast();
143 cp->method_at_put(index, class_index, name_and_type_index);
144 }
145 break;
146 case JVM_CONSTANT_InterfaceMethodref :
147 {
148 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
149 u2 class_index = cfs->get_u2_fast();
150 u2 name_and_type_index = cfs->get_u2_fast();
151 cp->interface_method_at_put(index, class_index, name_and_type_index);
152 }
153 break;
154 case JVM_CONSTANT_String :
155 {
156 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
157 u2 string_index = cfs->get_u2_fast();
158 cp->string_index_at_put(index, string_index);
159 }
160 break;
161 case JVM_CONSTANT_MethodHandle :
162 case JVM_CONSTANT_MethodType :
163 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
164 classfile_parse_error(
165 "Class file version does not support constant tag %u in class file %s",
166 tag, CHECK);
167 }
168 if (!EnableInvokeDynamic) {
169 classfile_parse_error(
170 "This JVM does not support constant tag %u in class file %s",
171 tag, CHECK);
172 }
173 if (tag == JVM_CONSTANT_MethodHandle) {
174 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
175 u1 ref_kind = cfs->get_u1_fast();
176 u2 method_index = cfs->get_u2_fast();
177 cp->method_handle_index_at_put(index, ref_kind, method_index);
178 } else if (tag == JVM_CONSTANT_MethodType) {
179 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
180 u2 signature_index = cfs->get_u2_fast();
181 cp->method_type_index_at_put(index, signature_index);
182 } else {
183 ShouldNotReachHere();
184 }
185 break;
186 case JVM_CONSTANT_InvokeDynamic :
187 {
188 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
189 classfile_parse_error(
190 "Class file version does not support constant tag %u in class file %s",
191 tag, CHECK);
192 }
193 if (!EnableInvokeDynamic) {
194 classfile_parse_error(
195 "This JVM does not support constant tag %u in class file %s",
196 tag, CHECK);
197 }
198 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
199 u2 bootstrap_specifier_index = cfs->get_u2_fast();
200 u2 name_and_type_index = cfs->get_u2_fast();
201 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
202 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
203 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
204 }
205 break;
206 case JVM_CONSTANT_Integer :
207 {
208 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
209 u4 bytes = cfs->get_u4_fast();
210 cp->int_at_put(index, (jint) bytes);
211 }
212 break;
213 case JVM_CONSTANT_Float :
214 {
215 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
216 u4 bytes = cfs->get_u4_fast();
217 cp->float_at_put(index, *(jfloat*)&bytes);
218 }
219 break;
220 case JVM_CONSTANT_Long :
221 // A mangled type might cause you to overrun allocated memory
222 guarantee_property(index+1 < length,
223 "Invalid constant pool entry %u in class file %s",
224 index, CHECK);
225 {
226 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
227 u8 bytes = cfs->get_u8_fast();
228 cp->long_at_put(index, bytes);
229 }
230 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
231 break;
232 case JVM_CONSTANT_Double :
233 // A mangled type might cause you to overrun allocated memory
234 guarantee_property(index+1 < length,
235 "Invalid constant pool entry %u in class file %s",
236 index, CHECK);
237 {
238 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
239 u8 bytes = cfs->get_u8_fast();
240 cp->double_at_put(index, *(jdouble*)&bytes);
241 }
242 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
243 break;
244 case JVM_CONSTANT_NameAndType :
245 {
246 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
247 u2 name_index = cfs->get_u2_fast();
248 u2 signature_index = cfs->get_u2_fast();
249 cp->name_and_type_at_put(index, name_index, signature_index);
250 }
251 break;
252 case JVM_CONSTANT_Utf8 :
253 {
254 cfs->guarantee_more(2, CHECK); // utf8_length
255 u2 utf8_length = cfs->get_u2_fast();
256 u1* utf8_buffer = cfs->get_u1_buffer();
257 assert(utf8_buffer != NULL, "null utf8 buffer");
258 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
259 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
260 cfs->skip_u1_fast(utf8_length);
261
262 // Before storing the symbol, make sure it's legal
263 if (_need_verify) {
264 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
265 }
266
267 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
268 Handle patch = clear_cp_patch_at(index);
269 guarantee_property(java_lang_String::is_instance(patch()),
270 "Illegal utf8 patch at %d in class file %s",
271 index, CHECK);
272 char* str = java_lang_String::as_utf8_string(patch());
273 // (could use java_lang_String::as_symbol instead, but might as well batch them)
274 utf8_buffer = (u1*) str;
275 utf8_length = (int) strlen(str);
276 }
277
278 unsigned int hash;
279 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
280 if (result == NULL) {
281 names[names_count] = (char*)utf8_buffer;
282 lengths[names_count] = utf8_length;
283 indices[names_count] = index;
284 hashValues[names_count++] = hash;
285 if (names_count == SymbolTable::symbol_alloc_batch_size) {
286 SymbolTable::new_symbols(loader_data, cp, names_count, names, lengths, indices, hashValues, CHECK);
287 names_count = 0;
288 }
289 } else {
290 cp->symbol_at_put(index, result);
291 }
292 }
293 break;
294 default:
295 classfile_parse_error(
296 "Unknown constant tag %u in class file %s", tag, CHECK);
297 break;
298 }
299 }
300
301 // Allocate the remaining symbols
302 if (names_count > 0) {
303 SymbolTable::new_symbols(loader_data, cp, names_count, names, lengths, indices, hashValues, CHECK);
304 }
305
306 // Copy _current pointer of local copy back to stream().
307 #ifdef ASSERT
308 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
309 #endif
310 cfs0->set_current(cfs1.current());
311 }
312
313 // This class unreferences constant pool symbols if an error has occurred
314 // while parsing the class before it is assigned into the class.
315 // If it gets an error after that it is unloaded and the constant pool will
316 // be cleaned up then.
317 class ConstantPoolCleaner : public StackObj {
318 constantPoolHandle _cphandle;
319 bool _in_error;
320 public:
321 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
322 ~ConstantPoolCleaner() {
323 if (_in_error && _cphandle.not_null()) {
324 _cphandle->unreference_symbols();
325 }
326 }
327 void set_in_error(bool clean) { _in_error = clean; }
328 };
329
330 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
331
332 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
333 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
334 return cp->symbol_at(index);
335 else
336 return NULL;
337 }
338
339 constantPoolHandle ClassFileParser::parse_constant_pool(ClassLoaderData* loader_data, TRAPS) {
340 ClassFileStream* cfs = stream();
341 constantPoolHandle nullHandle;
342
343 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
344 u2 length = cfs->get_u2_fast();
345 guarantee_property(
346 length >= 1, "Illegal constant pool size %u in class file %s",
347 length, CHECK_(nullHandle));
348 ConstantPool* constant_pool =
349 ConstantPool::allocate(loader_data,
350 length,
351 CHECK_(nullHandle));
352 constantPoolHandle cp (THREAD, constant_pool);
353
354 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
355
356 // parsing constant pool entries
357 parse_constant_pool_entries(loader_data, cp, length, CHECK_(nullHandle));
358
359 int index = 1; // declared outside of loops for portability
360
361 // first verification pass - validate cross references and fixup class and string constants
362 for (index = 1; index < length; index++) { // Index 0 is unused
363 jbyte tag = cp->tag_at(index).value();
364 switch (tag) {
365 case JVM_CONSTANT_Class :
366 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
367 break;
368 case JVM_CONSTANT_Fieldref :
369 // fall through
370 case JVM_CONSTANT_Methodref :
371 // fall through
372 case JVM_CONSTANT_InterfaceMethodref : {
373 if (!_need_verify) break;
374 int klass_ref_index = cp->klass_ref_index_at(index);
375 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
376 check_property(valid_cp_range(klass_ref_index, length) &&
377 is_klass_reference(cp, klass_ref_index),
378 "Invalid constant pool index %u in class file %s",
379 klass_ref_index,
380 CHECK_(nullHandle));
381 check_property(valid_cp_range(name_and_type_ref_index, length) &&
382 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
383 "Invalid constant pool index %u in class file %s",
384 name_and_type_ref_index,
385 CHECK_(nullHandle));
386 break;
387 }
388 case JVM_CONSTANT_String :
389 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
390 break;
391 case JVM_CONSTANT_Integer :
392 break;
393 case JVM_CONSTANT_Float :
394 break;
395 case JVM_CONSTANT_Long :
396 case JVM_CONSTANT_Double :
397 index++;
398 check_property(
399 (index < length && cp->tag_at(index).is_invalid()),
400 "Improper constant pool long/double index %u in class file %s",
401 index, CHECK_(nullHandle));
402 break;
403 case JVM_CONSTANT_NameAndType : {
404 if (!_need_verify) break;
405 int name_ref_index = cp->name_ref_index_at(index);
406 int signature_ref_index = cp->signature_ref_index_at(index);
407 check_property(
408 valid_cp_range(name_ref_index, length) &&
409 cp->tag_at(name_ref_index).is_utf8(),
410 "Invalid constant pool index %u in class file %s",
411 name_ref_index, CHECK_(nullHandle));
412 check_property(
413 valid_cp_range(signature_ref_index, length) &&
414 cp->tag_at(signature_ref_index).is_utf8(),
415 "Invalid constant pool index %u in class file %s",
416 signature_ref_index, CHECK_(nullHandle));
417 break;
418 }
419 case JVM_CONSTANT_Utf8 :
420 break;
421 case JVM_CONSTANT_UnresolvedClass : // fall-through
422 case JVM_CONSTANT_UnresolvedClassInError:
423 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
424 break;
425 case JVM_CONSTANT_ClassIndex :
426 {
427 int class_index = cp->klass_index_at(index);
428 check_property(
429 valid_cp_range(class_index, length) &&
430 cp->tag_at(class_index).is_utf8(),
431 "Invalid constant pool index %u in class file %s",
432 class_index, CHECK_(nullHandle));
433 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
434 }
435 break;
436 case JVM_CONSTANT_StringIndex :
437 {
438 int string_index = cp->string_index_at(index);
439 check_property(
440 valid_cp_range(string_index, length) &&
441 cp->tag_at(string_index).is_utf8(),
442 "Invalid constant pool index %u in class file %s",
443 string_index, CHECK_(nullHandle));
444 Symbol* sym = cp->symbol_at(string_index);
445 cp->unresolved_string_at_put(index, sym);
446 }
447 break;
448 case JVM_CONSTANT_MethodHandle :
449 {
450 int ref_index = cp->method_handle_index_at(index);
451 check_property(
452 valid_cp_range(ref_index, length) &&
453 EnableInvokeDynamic,
454 "Invalid constant pool index %u in class file %s",
455 ref_index, CHECK_(nullHandle));
456 constantTag tag = cp->tag_at(ref_index);
457 int ref_kind = cp->method_handle_ref_kind_at(index);
458 switch (ref_kind) {
459 case JVM_REF_getField:
460 case JVM_REF_getStatic:
461 case JVM_REF_putField:
462 case JVM_REF_putStatic:
463 check_property(
464 tag.is_field(),
465 "Invalid constant pool index %u in class file %s (not a field)",
466 ref_index, CHECK_(nullHandle));
467 break;
468 case JVM_REF_invokeVirtual:
469 case JVM_REF_invokeStatic:
470 case JVM_REF_invokeSpecial:
471 case JVM_REF_newInvokeSpecial:
472 check_property(
473 tag.is_method(),
474 "Invalid constant pool index %u in class file %s (not a method)",
475 ref_index, CHECK_(nullHandle));
476 break;
477 case JVM_REF_invokeInterface:
478 check_property(
479 tag.is_interface_method(),
480 "Invalid constant pool index %u in class file %s (not an interface method)",
481 ref_index, CHECK_(nullHandle));
482 break;
483 default:
484 classfile_parse_error(
485 "Bad method handle kind at constant pool index %u in class file %s",
486 index, CHECK_(nullHandle));
487 }
488 // Keep the ref_index unchanged. It will be indirected at link-time.
489 }
490 break;
491 case JVM_CONSTANT_MethodType :
492 {
493 int ref_index = cp->method_type_index_at(index);
494 check_property(
495 valid_cp_range(ref_index, length) &&
496 cp->tag_at(ref_index).is_utf8() &&
497 EnableInvokeDynamic,
498 "Invalid constant pool index %u in class file %s",
499 ref_index, CHECK_(nullHandle));
500 }
501 break;
502 case JVM_CONSTANT_InvokeDynamic :
503 {
504 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
505 check_property(valid_cp_range(name_and_type_ref_index, length) &&
506 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
507 "Invalid constant pool index %u in class file %s",
508 name_and_type_ref_index,
509 CHECK_(nullHandle));
510 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
511 break;
512 }
513 default:
514 fatal(err_msg("bad constant pool tag value %u",
515 cp->tag_at(index).value()));
516 ShouldNotReachHere();
517 break;
518 } // end of switch
519 } // end of for
520
521 if (_cp_patches != NULL) {
522 // need to treat this_class specially...
523 assert(EnableInvokeDynamic, "");
524 int this_class_index;
525 {
526 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
527 u1* mark = cfs->current();
528 u2 flags = cfs->get_u2_fast();
529 this_class_index = cfs->get_u2_fast();
530 cfs->set_current(mark); // revert to mark
531 }
532
533 for (index = 1; index < length; index++) { // Index 0 is unused
534 if (has_cp_patch_at(index)) {
535 guarantee_property(index != this_class_index,
536 "Illegal constant pool patch to self at %d in class file %s",
537 index, CHECK_(nullHandle));
538 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
539 }
540 }
541 }
542
543 if (!_need_verify) {
544 cp_in_error.set_in_error(false);
545 return cp;
546 }
547
548 // second verification pass - checks the strings are of the right format.
549 // but not yet to the other entries
550 for (index = 1; index < length; index++) {
551 jbyte tag = cp->tag_at(index).value();
552 switch (tag) {
553 case JVM_CONSTANT_UnresolvedClass: {
554 Symbol* class_name = cp->unresolved_klass_at(index);
555 // check the name, even if _cp_patches will overwrite it
556 verify_legal_class_name(class_name, CHECK_(nullHandle));
557 break;
558 }
559 case JVM_CONSTANT_NameAndType: {
560 if (_need_verify && _major_version >= JAVA_7_VERSION) {
561 int sig_index = cp->signature_ref_index_at(index);
562 int name_index = cp->name_ref_index_at(index);
563 Symbol* name = cp->symbol_at(name_index);
564 Symbol* sig = cp->symbol_at(sig_index);
565 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
566 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
567 } else {
568 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
569 }
570 }
571 break;
572 }
573 case JVM_CONSTANT_InvokeDynamic:
574 case JVM_CONSTANT_Fieldref:
575 case JVM_CONSTANT_Methodref:
576 case JVM_CONSTANT_InterfaceMethodref: {
577 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
578 // already verified to be utf8
579 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
580 // already verified to be utf8
581 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
582 Symbol* name = cp->symbol_at(name_ref_index);
583 Symbol* signature = cp->symbol_at(signature_ref_index);
584 if (tag == JVM_CONSTANT_Fieldref) {
585 verify_legal_field_name(name, CHECK_(nullHandle));
586 if (_need_verify && _major_version >= JAVA_7_VERSION) {
587 // Signature is verified above, when iterating NameAndType_info.
588 // Need only to be sure it's the right type.
589 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
590 throwIllegalSignature(
591 "Field", name, signature, CHECK_(nullHandle));
592 }
593 } else {
594 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
595 }
596 } else {
597 verify_legal_method_name(name, CHECK_(nullHandle));
598 if (_need_verify && _major_version >= JAVA_7_VERSION) {
599 // Signature is verified above, when iterating NameAndType_info.
600 // Need only to be sure it's the right type.
601 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
602 throwIllegalSignature(
603 "Method", name, signature, CHECK_(nullHandle));
604 }
605 } else {
606 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
607 }
608 if (tag == JVM_CONSTANT_Methodref) {
609 // 4509014: If a class method name begins with '<', it must be "<init>".
610 assert(name != NULL, "method name in constant pool is null");
611 unsigned int name_len = name->utf8_length();
612 assert(name_len > 0, "bad method name"); // already verified as legal name
613 if (name->byte_at(0) == '<') {
614 if (name != vmSymbols::object_initializer_name()) {
615 classfile_parse_error(
616 "Bad method name at constant pool index %u in class file %s",
617 name_ref_index, CHECK_(nullHandle));
618 }
619 }
620 }
621 }
622 break;
623 }
624 case JVM_CONSTANT_MethodHandle: {
625 int ref_index = cp->method_handle_index_at(index);
626 int ref_kind = cp->method_handle_ref_kind_at(index);
627 switch (ref_kind) {
628 case JVM_REF_invokeVirtual:
629 case JVM_REF_invokeStatic:
630 case JVM_REF_invokeSpecial:
631 case JVM_REF_newInvokeSpecial:
632 {
633 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
634 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
635 Symbol* name = cp->symbol_at(name_ref_index);
636 if (ref_kind == JVM_REF_newInvokeSpecial) {
637 if (name != vmSymbols::object_initializer_name()) {
638 classfile_parse_error(
639 "Bad constructor name at constant pool index %u in class file %s",
640 name_ref_index, CHECK_(nullHandle));
641 }
642 } else {
643 if (name == vmSymbols::object_initializer_name()) {
644 classfile_parse_error(
645 "Bad method name at constant pool index %u in class file %s",
646 name_ref_index, CHECK_(nullHandle));
647 }
648 }
649 }
650 break;
651 // Other ref_kinds are already fully checked in previous pass.
652 }
653 break;
654 }
655 case JVM_CONSTANT_MethodType: {
656 Symbol* no_name = vmSymbols::type_name(); // place holder
657 Symbol* signature = cp->method_type_signature_at(index);
658 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
659 break;
660 }
661 case JVM_CONSTANT_Utf8: {
662 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
663 }
664 } // end of switch
665 } // end of for
666
667 cp_in_error.set_in_error(false);
668 return cp;
669 }
670
671
672 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
673 assert(EnableInvokeDynamic, "");
674 BasicType patch_type = T_VOID;
675
676 switch (cp->tag_at(index).value()) {
677
678 case JVM_CONSTANT_UnresolvedClass :
679 // Patching a class means pre-resolving it.
680 // The name in the constant pool is ignored.
681 if (java_lang_Class::is_instance(patch())) {
682 guarantee_property(!java_lang_Class::is_primitive(patch()),
683 "Illegal class patch at %d in class file %s",
684 index, CHECK);
685 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
686 } else {
687 guarantee_property(java_lang_String::is_instance(patch()),
688 "Illegal class patch at %d in class file %s",
689 index, CHECK);
690 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
691 cp->unresolved_klass_at_put(index, name);
692 }
693 break;
694
695 case JVM_CONSTANT_String :
696 // skip this patch and don't clear it. Needs the oop array for resolved
697 // references to be created first.
698 return;
699
700 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
701 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
702 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
703 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
704 patch_prim:
705 {
706 jvalue value;
707 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
708 guarantee_property(value_type == patch_type,
709 "Illegal primitive patch at %d in class file %s",
710 index, CHECK);
711 switch (value_type) {
712 case T_INT: cp->int_at_put(index, value.i); break;
713 case T_FLOAT: cp->float_at_put(index, value.f); break;
714 case T_LONG: cp->long_at_put(index, value.j); break;
715 case T_DOUBLE: cp->double_at_put(index, value.d); break;
716 default: assert(false, "");
717 }
718 }
719 break;
720
721 default:
722 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
723 guarantee_property(!has_cp_patch_at(index),
724 "Illegal unexpected patch at %d in class file %s",
725 index, CHECK);
726 return;
727 }
728
729 // On fall-through, mark the patch as used.
730 clear_cp_patch_at(index);
731 }
732
733
734
735 class NameSigHash: public ResourceObj {
736 public:
737 Symbol* _name; // name
738 Symbol* _sig; // signature
739 NameSigHash* _next; // Next entry in hash table
740 };
741
742
743 #define HASH_ROW_SIZE 256
744
745 unsigned int hash(Symbol* name, Symbol* sig) {
746 unsigned int raw_hash = 0;
747 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
748 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
749
750 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
751 }
752
753
754 void initialize_hashtable(NameSigHash** table) {
755 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
756 }
757
758 // Return false if the name/sig combination is found in table.
759 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
760 // The old format checker uses heap sort to find duplicates.
761 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
762 // of table since we don't expect Symbol*'s to move.
763 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
764 assert(name != NULL, "name in constant pool is NULL");
765
766 // First lookup for duplicates
767 int index = hash(name, sig);
768 NameSigHash* entry = table[index];
769 while (entry != NULL) {
770 if (entry->_name == name && entry->_sig == sig) {
771 return false;
772 }
773 entry = entry->_next;
774 }
775
776 // No duplicate is found, allocate a new entry and fill it.
777 entry = new NameSigHash();
778 entry->_name = name;
779 entry->_sig = sig;
780
781 // Insert into hash table
782 entry->_next = table[index];
783 table[index] = entry;
784
785 return true;
786 }
787
788
789 Array<Klass*>* ClassFileParser::parse_interfaces(constantPoolHandle cp,
790 int length,
791 ClassLoaderData* loader_data,
792 Handle protection_domain,
793 Symbol* class_name,
794 bool* has_default_methods,
795 TRAPS) {
796 ClassFileStream* cfs = stream();
797 assert(length > 0, "only called for length>0");
798 // FIXME: Leak at later OOM.
799 Array<Klass*>* interfaces = MetadataFactory::new_array<Klass*>(loader_data, length, NULL, CHECK_NULL);
800
801 int index;
802 for (index = 0; index < length; index++) {
803 u2 interface_index = cfs->get_u2(CHECK_NULL);
804 KlassHandle interf;
805 check_property(
806 valid_cp_range(interface_index, cp->length()) &&
807 is_klass_reference(cp, interface_index),
808 "Interface name has bad constant pool index %u in class file %s",
809 interface_index, CHECK_NULL);
810 if (cp->tag_at(interface_index).is_klass()) {
811 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
812 } else {
813 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
814
815 // Don't need to check legal name because it's checked when parsing constant pool.
816 // But need to make sure it's not an array type.
817 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
818 "Bad interface name in class file %s", CHECK_NULL);
819 Handle class_loader(THREAD, loader_data->class_loader());
820
821 // Call resolve_super so classcircularity is checked
822 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
823 unresolved_klass, class_loader, protection_domain,
824 false, CHECK_NULL);
825 interf = KlassHandle(THREAD, k);
826 }
827
828 if (!interf()->is_interface()) {
829 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
830 }
831 if (InstanceKlass::cast(interf())->has_default_methods()) {
832 *has_default_methods = true;
833 }
834 interfaces->at_put(index, interf());
835 }
836
837 if (!_need_verify || length <= 1) {
838 return interfaces;
839 }
840
841 // Check if there's any duplicates in interfaces
842 ResourceMark rm(THREAD);
843 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
844 THREAD, NameSigHash*, HASH_ROW_SIZE);
845 initialize_hashtable(interface_names);
846 bool dup = false;
847 {
848 debug_only(No_Safepoint_Verifier nsv;)
849 for (index = 0; index < length; index++) {
850 Klass* k = interfaces->at(index);
851 Symbol* name = InstanceKlass::cast(k)->name();
852 // If no duplicates, add (name, NULL) in hashtable interface_names.
853 if (!put_after_lookup(name, NULL, interface_names)) {
854 dup = true;
855 break;
856 }
857 }
858 }
859 if (dup) {
860 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
861 }
862
863 return interfaces;
864 }
865
866
867 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
868 // Make sure the constant pool entry is of a type appropriate to this field
869 guarantee_property(
870 (constantvalue_index > 0 &&
871 constantvalue_index < cp->length()),
872 "Bad initial value index %u in ConstantValue attribute in class file %s",
873 constantvalue_index, CHECK);
874 constantTag value_type = cp->tag_at(constantvalue_index);
875 switch ( cp->basic_type_for_signature_at(signature_index) ) {
876 case T_LONG:
877 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
878 break;
879 case T_FLOAT:
880 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
881 break;
882 case T_DOUBLE:
883 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
884 break;
885 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
886 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
887 break;
888 case T_OBJECT:
889 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
890 && value_type.is_string()),
891 "Bad string initial value in class file %s", CHECK);
892 break;
893 default:
894 classfile_parse_error(
895 "Unable to set initial value %u in class file %s",
896 constantvalue_index, CHECK);
897 }
898 }
899
900
901 // Parse attributes for a field.
902 void ClassFileParser::parse_field_attributes(ClassLoaderData* loader_data,
903 constantPoolHandle cp,
904 u2 attributes_count,
905 bool is_static, u2 signature_index,
906 u2* constantvalue_index_addr,
907 bool* is_synthetic_addr,
908 u2* generic_signature_index_addr,
909 AnnotationArray** field_annotations,
910 AnnotationArray** field_type_annotations,
911 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
912 TRAPS) {
913 ClassFileStream* cfs = stream();
914 assert(attributes_count > 0, "length should be greater than 0");
915 u2 constantvalue_index = 0;
916 u2 generic_signature_index = 0;
917 bool is_synthetic = false;
918 u1* runtime_visible_annotations = NULL;
919 int runtime_visible_annotations_length = 0;
920 u1* runtime_invisible_annotations = NULL;
921 int runtime_invisible_annotations_length = 0;
922 u1* runtime_visible_type_annotations = NULL;
923 int runtime_visible_type_annotations_length = 0;
924 u1* runtime_invisible_type_annotations = NULL;
925 int runtime_invisible_type_annotations_length = 0;
926 while (attributes_count--) {
927 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
928 u2 attribute_name_index = cfs->get_u2_fast();
929 u4 attribute_length = cfs->get_u4_fast();
930 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
931 cp->tag_at(attribute_name_index).is_utf8(),
932 "Invalid field attribute index %u in class file %s",
933 attribute_name_index,
934 CHECK);
935 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
936 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
937 // ignore if non-static
938 if (constantvalue_index != 0) {
939 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
940 }
941 check_property(
942 attribute_length == 2,
943 "Invalid ConstantValue field attribute length %u in class file %s",
944 attribute_length, CHECK);
945 constantvalue_index = cfs->get_u2(CHECK);
946 if (_need_verify) {
947 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
948 }
949 } else if (attribute_name == vmSymbols::tag_synthetic()) {
950 if (attribute_length != 0) {
951 classfile_parse_error(
952 "Invalid Synthetic field attribute length %u in class file %s",
953 attribute_length, CHECK);
954 }
955 is_synthetic = true;
956 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
957 if (attribute_length != 0) {
958 classfile_parse_error(
959 "Invalid Deprecated field attribute length %u in class file %s",
960 attribute_length, CHECK);
961 }
962 } else if (_major_version >= JAVA_1_5_VERSION) {
963 if (attribute_name == vmSymbols::tag_signature()) {
964 if (attribute_length != 2) {
965 classfile_parse_error(
966 "Wrong size %u for field's Signature attribute in class file %s",
967 attribute_length, CHECK);
968 }
969 generic_signature_index = cfs->get_u2(CHECK);
970 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
971 runtime_visible_annotations_length = attribute_length;
972 runtime_visible_annotations = cfs->get_u1_buffer();
973 assert(runtime_visible_annotations != NULL, "null visible annotations");
974 parse_annotations(loader_data,
975 runtime_visible_annotations,
976 runtime_visible_annotations_length,
977 cp,
978 parsed_annotations,
979 CHECK);
980 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
981 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
982 runtime_invisible_annotations_length = attribute_length;
983 runtime_invisible_annotations = cfs->get_u1_buffer();
984 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
985 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
986 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
987 runtime_visible_type_annotations_length = attribute_length;
988 runtime_visible_type_annotations = cfs->get_u1_buffer();
989 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
990 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
991 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
992 runtime_invisible_type_annotations_length = attribute_length;
993 runtime_invisible_type_annotations = cfs->get_u1_buffer();
994 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
995 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
996 } else {
997 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
998 }
999 } else {
1000 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1001 }
1002 }
1003
1004 *constantvalue_index_addr = constantvalue_index;
1005 *is_synthetic_addr = is_synthetic;
1006 *generic_signature_index_addr = generic_signature_index;
1007 *field_annotations = assemble_annotations(loader_data,
1008 runtime_visible_annotations,
1009 runtime_visible_annotations_length,
1010 runtime_invisible_annotations,
1011 runtime_invisible_annotations_length,
1012 CHECK);
1013 *field_type_annotations = assemble_annotations(loader_data,
1014 runtime_visible_type_annotations,
1015 runtime_visible_type_annotations_length,
1016 runtime_invisible_type_annotations,
1017 runtime_invisible_type_annotations_length,
1018 CHECK);
1019 return;
1020 }
1021
1022
1023 // Field allocation types. Used for computing field offsets.
1024
1025 enum FieldAllocationType {
1026 STATIC_OOP, // Oops
1027 STATIC_BYTE, // Boolean, Byte, char
1028 STATIC_SHORT, // shorts
1029 STATIC_WORD, // ints
1030 STATIC_DOUBLE, // aligned long or double
1031 NONSTATIC_OOP,
1032 NONSTATIC_BYTE,
1033 NONSTATIC_SHORT,
1034 NONSTATIC_WORD,
1035 NONSTATIC_DOUBLE,
1036 MAX_FIELD_ALLOCATION_TYPE,
1037 BAD_ALLOCATION_TYPE = -1
1038 };
1039
1040 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1041 BAD_ALLOCATION_TYPE, // 0
1042 BAD_ALLOCATION_TYPE, // 1
1043 BAD_ALLOCATION_TYPE, // 2
1044 BAD_ALLOCATION_TYPE, // 3
1045 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1046 NONSTATIC_SHORT, // T_CHAR = 5,
1047 NONSTATIC_WORD, // T_FLOAT = 6,
1048 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1049 NONSTATIC_BYTE, // T_BYTE = 8,
1050 NONSTATIC_SHORT, // T_SHORT = 9,
1051 NONSTATIC_WORD, // T_INT = 10,
1052 NONSTATIC_DOUBLE, // T_LONG = 11,
1053 NONSTATIC_OOP, // T_OBJECT = 12,
1054 NONSTATIC_OOP, // T_ARRAY = 13,
1055 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1056 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1057 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1058 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1059 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1060 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1061 BAD_ALLOCATION_TYPE, // 0
1062 BAD_ALLOCATION_TYPE, // 1
1063 BAD_ALLOCATION_TYPE, // 2
1064 BAD_ALLOCATION_TYPE, // 3
1065 STATIC_BYTE , // T_BOOLEAN = 4,
1066 STATIC_SHORT, // T_CHAR = 5,
1067 STATIC_WORD, // T_FLOAT = 6,
1068 STATIC_DOUBLE, // T_DOUBLE = 7,
1069 STATIC_BYTE, // T_BYTE = 8,
1070 STATIC_SHORT, // T_SHORT = 9,
1071 STATIC_WORD, // T_INT = 10,
1072 STATIC_DOUBLE, // T_LONG = 11,
1073 STATIC_OOP, // T_OBJECT = 12,
1074 STATIC_OOP, // T_ARRAY = 13,
1075 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1076 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1077 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1078 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1079 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1080 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1081 };
1082
1083 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1084 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1085 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1086 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1087 return result;
1088 }
1089
1090 class FieldAllocationCount: public ResourceObj {
1091 public:
1092 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1093
1094 FieldAllocationCount() {
1095 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1096 count[i] = 0;
1097 }
1098 }
1099
1100 FieldAllocationType update(bool is_static, BasicType type) {
1101 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1102 // Make sure there is no overflow with injected fields.
1103 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1104 count[atype]++;
1105 return atype;
1106 }
1107 };
1108
1109 Array<u2>* ClassFileParser::parse_fields(ClassLoaderData* loader_data,
1110 Symbol* class_name,
1111 constantPoolHandle cp,
1112 bool is_interface,
1113 FieldAllocationCount *fac,
1114 Array<AnnotationArray*>** fields_annotations,
1115 Array<AnnotationArray*>** fields_type_annotations,
1116 u2* java_fields_count_ptr, TRAPS) {
1117 ClassFileStream* cfs = stream();
1118 cfs->guarantee_more(2, CHECK_NULL); // length
1119 u2 length = cfs->get_u2_fast();
1120 *java_fields_count_ptr = length;
1121
1122 int num_injected = 0;
1123 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1124 int total_fields = length + num_injected;
1125
1126 // The field array starts with tuples of shorts
1127 // [access, name index, sig index, initial value index, byte offset].
1128 // A generic signature slot only exists for field with generic
1129 // signature attribute. And the access flag is set with
1130 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1131 // signature slots are at the end of the field array and after all
1132 // other fields data.
1133 //
1134 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1135 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1136 // ...
1137 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1138 // [generic signature index]
1139 // [generic signature index]
1140 // ...
1141 //
1142 // Allocate a temporary resource array for field data. For each field,
1143 // a slot is reserved in the temporary array for the generic signature
1144 // index. After parsing all fields, the data are copied to a permanent
1145 // array and any unused slots will be discarded.
1146 ResourceMark rm(THREAD);
1147 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1148 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1149
1150 AnnotationArray* field_annotations = NULL;
1151 AnnotationArray* field_type_annotations = NULL;
1152 // The generic signature slots start after all other fields' data.
1153 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1154 int num_generic_signature = 0;
1155 for (int n = 0; n < length; n++) {
1156 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1157
1158 AccessFlags access_flags;
1159 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1160 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1161 access_flags.set_flags(flags);
1162
1163 u2 name_index = cfs->get_u2_fast();
1164 int cp_size = cp->length();
1165 check_property(
1166 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1167 "Invalid constant pool index %u for field name in class file %s",
1168 name_index, CHECK_NULL);
1169 Symbol* name = cp->symbol_at(name_index);
1170 verify_legal_field_name(name, CHECK_NULL);
1171
1172 u2 signature_index = cfs->get_u2_fast();
1173 check_property(
1174 valid_cp_range(signature_index, cp_size) &&
1175 cp->tag_at(signature_index).is_utf8(),
1176 "Invalid constant pool index %u for field signature in class file %s",
1177 signature_index, CHECK_NULL);
1178 Symbol* sig = cp->symbol_at(signature_index);
1179 verify_legal_field_signature(name, sig, CHECK_NULL);
1180
1181 u2 constantvalue_index = 0;
1182 bool is_synthetic = false;
1183 u2 generic_signature_index = 0;
1184 bool is_static = access_flags.is_static();
1185 FieldAnnotationCollector parsed_annotations;
1186
1187 u2 attributes_count = cfs->get_u2_fast();
1188 if (attributes_count > 0) {
1189 parse_field_attributes(loader_data,
1190 cp, attributes_count, is_static, signature_index,
1191 &constantvalue_index, &is_synthetic,
1192 &generic_signature_index, &field_annotations,
1193 &field_type_annotations, &parsed_annotations,
1194 CHECK_NULL);
1195 if (field_annotations != NULL) {
1196 if (*fields_annotations == NULL) {
1197 *fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1198 loader_data, length, NULL,
1199 CHECK_NULL);
1200 }
1201 (*fields_annotations)->at_put(n, field_annotations);
1202 }
1203 if (field_type_annotations != NULL) {
1204 if (*fields_type_annotations == NULL) {
1205 *fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1206 loader_data, length, NULL,
1207 CHECK_NULL);
1208 }
1209 (*fields_type_annotations)->at_put(n, field_type_annotations);
1210 }
1211 if (is_synthetic) {
1212 access_flags.set_is_synthetic();
1213 }
1214 if (generic_signature_index != 0) {
1215 access_flags.set_field_has_generic_signature();
1216 fa[generic_signature_slot] = generic_signature_index;
1217 generic_signature_slot ++;
1218 num_generic_signature ++;
1219 }
1220 }
1221
1222 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1223 field->initialize(access_flags.as_short(),
1224 name_index,
1225 signature_index,
1226 constantvalue_index);
1227 BasicType type = cp->basic_type_for_signature_at(signature_index);
1228
1229 // Remember how many oops we encountered and compute allocation type
1230 FieldAllocationType atype = fac->update(is_static, type);
1231 field->set_allocation_type(atype);
1232
1233 // After field is initialized with type, we can augment it with aux info
1234 if (parsed_annotations.has_any_annotations())
1235 parsed_annotations.apply_to(field);
1236 }
1237
1238 int index = length;
1239 if (num_injected != 0) {
1240 for (int n = 0; n < num_injected; n++) {
1241 // Check for duplicates
1242 if (injected[n].may_be_java) {
1243 Symbol* name = injected[n].name();
1244 Symbol* signature = injected[n].signature();
1245 bool duplicate = false;
1246 for (int i = 0; i < length; i++) {
1247 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1248 if (name == cp->symbol_at(f->name_index()) &&
1249 signature == cp->symbol_at(f->signature_index())) {
1250 // Symbol is desclared in Java so skip this one
1251 duplicate = true;
1252 break;
1253 }
1254 }
1255 if (duplicate) {
1256 // These will be removed from the field array at the end
1257 continue;
1258 }
1259 }
1260
1261 // Injected field
1262 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1263 field->initialize(JVM_ACC_FIELD_INTERNAL,
1264 injected[n].name_index,
1265 injected[n].signature_index,
1266 0);
1267
1268 BasicType type = FieldType::basic_type(injected[n].signature());
1269
1270 // Remember how many oops we encountered and compute allocation type
1271 FieldAllocationType atype = fac->update(false, type);
1272 field->set_allocation_type(atype);
1273 index++;
1274 }
1275 }
1276
1277 // Now copy the fields' data from the temporary resource array.
1278 // Sometimes injected fields already exist in the Java source so
1279 // the fields array could be too long. In that case the
1280 // fields array is trimed. Also unused slots that were reserved
1281 // for generic signature indexes are discarded.
1282 Array<u2>* fields = MetadataFactory::new_array<u2>(
1283 loader_data, index * FieldInfo::field_slots + num_generic_signature,
1284 CHECK_NULL);
1285 {
1286 int i = 0;
1287 for (; i < index * FieldInfo::field_slots; i++) {
1288 fields->at_put(i, fa[i]);
1289 }
1290 for (int j = total_fields * FieldInfo::field_slots;
1291 j < generic_signature_slot; j++) {
1292 fields->at_put(i++, fa[j]);
1293 }
1294 assert(i == fields->length(), "");
1295 }
1296
1297 if (_need_verify && length > 1) {
1298 // Check duplicated fields
1299 ResourceMark rm(THREAD);
1300 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1301 THREAD, NameSigHash*, HASH_ROW_SIZE);
1302 initialize_hashtable(names_and_sigs);
1303 bool dup = false;
1304 {
1305 debug_only(No_Safepoint_Verifier nsv;)
1306 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1307 Symbol* name = fs.name();
1308 Symbol* sig = fs.signature();
1309 // If no duplicates, add name/signature in hashtable names_and_sigs.
1310 if (!put_after_lookup(name, sig, names_and_sigs)) {
1311 dup = true;
1312 break;
1313 }
1314 }
1315 }
1316 if (dup) {
1317 classfile_parse_error("Duplicate field name&signature in class file %s",
1318 CHECK_NULL);
1319 }
1320 }
1321
1322 return fields;
1323 }
1324
1325
1326 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1327 while (length-- > 0) {
1328 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1329 }
1330 }
1331
1332
1333 u2* ClassFileParser::parse_exception_table(ClassLoaderData* loader_data,
1334 u4 code_length,
1335 u4 exception_table_length,
1336 constantPoolHandle cp,
1337 TRAPS) {
1338 ClassFileStream* cfs = stream();
1339
1340 u2* exception_table_start = cfs->get_u2_buffer();
1341 assert(exception_table_start != NULL, "null exception table");
1342 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1343 // Will check legal target after parsing code array in verifier.
1344 if (_need_verify) {
1345 for (unsigned int i = 0; i < exception_table_length; i++) {
1346 u2 start_pc = cfs->get_u2_fast();
1347 u2 end_pc = cfs->get_u2_fast();
1348 u2 handler_pc = cfs->get_u2_fast();
1349 u2 catch_type_index = cfs->get_u2_fast();
1350 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1351 "Illegal exception table range in class file %s",
1352 CHECK_NULL);
1353 guarantee_property(handler_pc < code_length,
1354 "Illegal exception table handler in class file %s",
1355 CHECK_NULL);
1356 if (catch_type_index != 0) {
1357 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1358 is_klass_reference(cp, catch_type_index),
1359 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1360 }
1361 }
1362 } else {
1363 cfs->skip_u2_fast(exception_table_length * 4);
1364 }
1365 return exception_table_start;
1366 }
1367
1368 void ClassFileParser::parse_linenumber_table(
1369 u4 code_attribute_length, u4 code_length,
1370 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1371 ClassFileStream* cfs = stream();
1372 unsigned int num_entries = cfs->get_u2(CHECK);
1373
1374 // Each entry is a u2 start_pc, and a u2 line_number
1375 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1376
1377 // Verify line number attribute and table length
1378 check_property(
1379 code_attribute_length == sizeof(u2) + length_in_bytes,
1380 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1381
1382 cfs->guarantee_more(length_in_bytes, CHECK);
1383
1384 if ((*write_stream) == NULL) {
1385 if (length_in_bytes > fixed_buffer_size) {
1386 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1387 } else {
1388 (*write_stream) = new CompressedLineNumberWriteStream(
1389 linenumbertable_buffer, fixed_buffer_size);
1390 }
1391 }
1392
1393 while (num_entries-- > 0) {
1394 u2 bci = cfs->get_u2_fast(); // start_pc
1395 u2 line = cfs->get_u2_fast(); // line_number
1396 guarantee_property(bci < code_length,
1397 "Invalid pc in LineNumberTable in class file %s", CHECK);
1398 (*write_stream)->write_pair(bci, line);
1399 }
1400 }
1401
1402
1403 // Class file LocalVariableTable elements.
1404 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1405 public:
1406 u2 start_bci;
1407 u2 length;
1408 u2 name_cp_index;
1409 u2 descriptor_cp_index;
1410 u2 slot;
1411 };
1412
1413
1414 class LVT_Hash: public CHeapObj<mtClass> {
1415 public:
1416 LocalVariableTableElement *_elem; // element
1417 LVT_Hash* _next; // Next entry in hash table
1418 };
1419
1420 unsigned int hash(LocalVariableTableElement *elem) {
1421 unsigned int raw_hash = elem->start_bci;
1422
1423 raw_hash = elem->length + raw_hash * 37;
1424 raw_hash = elem->name_cp_index + raw_hash * 37;
1425 raw_hash = elem->slot + raw_hash * 37;
1426
1427 return raw_hash % HASH_ROW_SIZE;
1428 }
1429
1430 void initialize_hashtable(LVT_Hash** table) {
1431 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1432 table[i] = NULL;
1433 }
1434 }
1435
1436 void clear_hashtable(LVT_Hash** table) {
1437 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1438 LVT_Hash* current = table[i];
1439 LVT_Hash* next;
1440 while (current != NULL) {
1441 next = current->_next;
1442 current->_next = NULL;
1443 delete(current);
1444 current = next;
1445 }
1446 table[i] = NULL;
1447 }
1448 }
1449
1450 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1451 LVT_Hash* entry = table[index];
1452
1453 /*
1454 * 3-tuple start_bci/length/slot has to be unique key,
1455 * so the following comparison seems to be redundant:
1456 * && elem->name_cp_index == entry->_elem->name_cp_index
1457 */
1458 while (entry != NULL) {
1459 if (elem->start_bci == entry->_elem->start_bci
1460 && elem->length == entry->_elem->length
1461 && elem->name_cp_index == entry->_elem->name_cp_index
1462 && elem->slot == entry->_elem->slot
1463 ) {
1464 return entry;
1465 }
1466 entry = entry->_next;
1467 }
1468 return NULL;
1469 }
1470
1471 // Return false if the local variable is found in table.
1472 // Return true if no duplicate is found.
1473 // And local variable is added as a new entry in table.
1474 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1475 // First lookup for duplicates
1476 int index = hash(elem);
1477 LVT_Hash* entry = LVT_lookup(elem, index, table);
1478
1479 if (entry != NULL) {
1480 return false;
1481 }
1482 // No duplicate is found, allocate a new entry and fill it.
1483 if ((entry = new LVT_Hash()) == NULL) {
1484 return false;
1485 }
1486 entry->_elem = elem;
1487
1488 // Insert into hash table
1489 entry->_next = table[index];
1490 table[index] = entry;
1491
1492 return true;
1493 }
1494
1495 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1496 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1497 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1498 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1499 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1500 lvt->signature_cp_index = 0;
1501 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1502 }
1503
1504 // Function is used to parse both attributes:
1505 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1506 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1507 u2 max_locals,
1508 u4 code_attribute_length,
1509 constantPoolHandle cp,
1510 u2* localvariable_table_length,
1511 bool isLVTT,
1512 TRAPS) {
1513 ClassFileStream* cfs = stream();
1514 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1515 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1516 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1517 // Verify local variable table attribute has right length
1518 if (_need_verify) {
1519 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1520 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1521 }
1522 u2* localvariable_table_start = cfs->get_u2_buffer();
1523 assert(localvariable_table_start != NULL, "null local variable table");
1524 if (!_need_verify) {
1525 cfs->skip_u2_fast(size);
1526 } else {
1527 cfs->guarantee_more(size * 2, CHECK_NULL);
1528 for(int i = 0; i < (*localvariable_table_length); i++) {
1529 u2 start_pc = cfs->get_u2_fast();
1530 u2 length = cfs->get_u2_fast();
1531 u2 name_index = cfs->get_u2_fast();
1532 u2 descriptor_index = cfs->get_u2_fast();
1533 u2 index = cfs->get_u2_fast();
1534 // Assign to a u4 to avoid overflow
1535 u4 end_pc = (u4)start_pc + (u4)length;
1536
1537 if (start_pc >= code_length) {
1538 classfile_parse_error(
1539 "Invalid start_pc %u in %s in class file %s",
1540 start_pc, tbl_name, CHECK_NULL);
1541 }
1542 if (end_pc > code_length) {
1543 classfile_parse_error(
1544 "Invalid length %u in %s in class file %s",
1545 length, tbl_name, CHECK_NULL);
1546 }
1547 int cp_size = cp->length();
1548 guarantee_property(
1549 valid_cp_range(name_index, cp_size) &&
1550 cp->tag_at(name_index).is_utf8(),
1551 "Name index %u in %s has bad constant type in class file %s",
1552 name_index, tbl_name, CHECK_NULL);
1553 guarantee_property(
1554 valid_cp_range(descriptor_index, cp_size) &&
1555 cp->tag_at(descriptor_index).is_utf8(),
1556 "Signature index %u in %s has bad constant type in class file %s",
1557 descriptor_index, tbl_name, CHECK_NULL);
1558
1559 Symbol* name = cp->symbol_at(name_index);
1560 Symbol* sig = cp->symbol_at(descriptor_index);
1561 verify_legal_field_name(name, CHECK_NULL);
1562 u2 extra_slot = 0;
1563 if (!isLVTT) {
1564 verify_legal_field_signature(name, sig, CHECK_NULL);
1565
1566 // 4894874: check special cases for double and long local variables
1567 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1568 sig == vmSymbols::type_signature(T_LONG)) {
1569 extra_slot = 1;
1570 }
1571 }
1572 guarantee_property((index + extra_slot) < max_locals,
1573 "Invalid index %u in %s in class file %s",
1574 index, tbl_name, CHECK_NULL);
1575 }
1576 }
1577 return localvariable_table_start;
1578 }
1579
1580
1581 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1582 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1583 ClassFileStream* cfs = stream();
1584 u2 index = 0; // index in the array with long/double occupying two slots
1585 u4 i1 = *u1_index;
1586 u4 i2 = *u2_index + 1;
1587 for(int i = 0; i < array_length; i++) {
1588 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1589 index++;
1590 if (tag == ITEM_Long || tag == ITEM_Double) {
1591 index++;
1592 } else if (tag == ITEM_Object) {
1593 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1594 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1595 is_klass_reference(cp, class_index),
1596 "Bad class index %u in StackMap in class file %s",
1597 class_index, CHECK);
1598 } else if (tag == ITEM_Uninitialized) {
1599 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1600 guarantee_property(
1601 offset < code_length,
1602 "Bad uninitialized type offset %u in StackMap in class file %s",
1603 offset, CHECK);
1604 } else {
1605 guarantee_property(
1606 tag <= (u1)ITEM_Uninitialized,
1607 "Unknown variable type %u in StackMap in class file %s",
1608 tag, CHECK);
1609 }
1610 }
1611 u2_array[*u2_index] = index;
1612 *u1_index = i1;
1613 *u2_index = i2;
1614 }
1615
1616 Array<u1>* ClassFileParser::parse_stackmap_table(
1617 ClassLoaderData* loader_data,
1618 u4 code_attribute_length, TRAPS) {
1619 if (code_attribute_length == 0)
1620 return NULL;
1621
1622 ClassFileStream* cfs = stream();
1623 u1* stackmap_table_start = cfs->get_u1_buffer();
1624 assert(stackmap_table_start != NULL, "null stackmap table");
1625
1626 // check code_attribute_length first
1627 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1628
1629 if (!_need_verify && !DumpSharedSpaces) {
1630 return NULL;
1631 }
1632
1633 Array<u1>* stackmap_data =
1634 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1635
1636 memcpy((void*)stackmap_data->adr_at(0),
1637 (void*)stackmap_table_start, code_attribute_length);
1638 return stackmap_data;
1639 }
1640
1641 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1642 u4 method_attribute_length,
1643 constantPoolHandle cp, TRAPS) {
1644 ClassFileStream* cfs = stream();
1645 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1646 *checked_exceptions_length = cfs->get_u2_fast();
1647 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1648 u2* checked_exceptions_start = cfs->get_u2_buffer();
1649 assert(checked_exceptions_start != NULL, "null checked exceptions");
1650 if (!_need_verify) {
1651 cfs->skip_u2_fast(size);
1652 } else {
1653 // Verify each value in the checked exception table
1654 u2 checked_exception;
1655 u2 len = *checked_exceptions_length;
1656 cfs->guarantee_more(2 * len, CHECK_NULL);
1657 for (int i = 0; i < len; i++) {
1658 checked_exception = cfs->get_u2_fast();
1659 check_property(
1660 valid_cp_range(checked_exception, cp->length()) &&
1661 is_klass_reference(cp, checked_exception),
1662 "Exception name has bad type at constant pool %u in class file %s",
1663 checked_exception, CHECK_NULL);
1664 }
1665 }
1666 // check exceptions attribute length
1667 if (_need_verify) {
1668 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1669 sizeof(u2) * size),
1670 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1671 }
1672 return checked_exceptions_start;
1673 }
1674
1675 void ClassFileParser::throwIllegalSignature(
1676 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1677 ResourceMark rm(THREAD);
1678 Exceptions::fthrow(THREAD_AND_LOCATION,
1679 vmSymbols::java_lang_ClassFormatError(),
1680 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1681 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1682 }
1683
1684 // Skip an annotation. Return >=limit if there is any problem.
1685 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1686 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1687 // value := switch (tag:u1) { ... }
1688 index += 2; // skip atype
1689 if ((index += 2) >= limit) return limit; // read nmem
1690 int nmem = Bytes::get_Java_u2(buffer+index-2);
1691 while (--nmem >= 0 && index < limit) {
1692 index += 2; // skip member
1693 index = skip_annotation_value(buffer, limit, index);
1694 }
1695 return index;
1696 }
1697
1698 // Skip an annotation value. Return >=limit if there is any problem.
1699 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1700 // value := switch (tag:u1) {
1701 // case B, C, I, S, Z, D, F, J, c: con:u2;
1702 // case e: e_class:u2 e_name:u2;
1703 // case s: s_con:u2;
1704 // case [: do(nval:u2) {value};
1705 // case @: annotation;
1706 // case s: s_con:u2;
1707 // }
1708 if ((index += 1) >= limit) return limit; // read tag
1709 u1 tag = buffer[index-1];
1710 switch (tag) {
1711 case 'B': case 'C': case 'I': case 'S': case 'Z':
1712 case 'D': case 'F': case 'J': case 'c': case 's':
1713 index += 2; // skip con or s_con
1714 break;
1715 case 'e':
1716 index += 4; // skip e_class, e_name
1717 break;
1718 case '[':
1719 {
1720 if ((index += 2) >= limit) return limit; // read nval
1721 int nval = Bytes::get_Java_u2(buffer+index-2);
1722 while (--nval >= 0 && index < limit) {
1723 index = skip_annotation_value(buffer, limit, index);
1724 }
1725 }
1726 break;
1727 case '@':
1728 index = skip_annotation(buffer, limit, index);
1729 break;
1730 default:
1731 assert(false, "annotation tag");
1732 return limit; // bad tag byte
1733 }
1734 return index;
1735 }
1736
1737 // Sift through annotations, looking for those significant to the VM:
1738 void ClassFileParser::parse_annotations(ClassLoaderData* loader_data,
1739 u1* buffer, int limit,
1740 constantPoolHandle cp,
1741 ClassFileParser::AnnotationCollector* coll,
1742 TRAPS) {
1743 // annotations := do(nann:u2) {annotation}
1744 int index = 0;
1745 if ((index += 2) >= limit) return; // read nann
1746 int nann = Bytes::get_Java_u2(buffer+index-2);
1747 enum { // initial annotation layout
1748 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1749 count_off = 2, // u2 such as 1 (one value)
1750 member_off = 4, // utf8 such as 'value'
1751 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1752 e_tag_val = 'e',
1753 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1754 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1755 e_size = 11, // end of 'e' annotation
1756 c_tag_val = 'c', // payload is type
1757 c_con_off = 7, // utf8 payload, such as 'I'
1758 c_size = 9, // end of 'c' annotation
1759 s_tag_val = 's', // payload is String
1760 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1761 s_size = 9,
1762 min_size = 6 // smallest possible size (zero members)
1763 };
1764 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1765 int index0 = index;
1766 index = skip_annotation(buffer, limit, index);
1767 u1* abase = buffer + index0;
1768 int atype = Bytes::get_Java_u2(abase + atype_off);
1769 int count = Bytes::get_Java_u2(abase + count_off);
1770 Symbol* aname = check_symbol_at(cp, atype);
1771 if (aname == NULL) break; // invalid annotation name
1772 Symbol* member = NULL;
1773 if (count >= 1) {
1774 int member_index = Bytes::get_Java_u2(abase + member_off);
1775 member = check_symbol_at(cp, member_index);
1776 if (member == NULL) break; // invalid member name
1777 }
1778
1779 // Here is where parsing particular annotations will take place.
1780 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1781 if (id == AnnotationCollector::_unknown) continue;
1782 coll->set_annotation(id);
1783
1784 if (id == AnnotationCollector::_sun_misc_Contended) {
1785 if (count == 1
1786 && s_size == (index - index0) // match size
1787 && s_tag_val == *(abase + tag_off)
1788 && member == vmSymbols::value_name()) {
1789 u2 group_index = Bytes::get_Java_u2(abase + s_con_off);
1790 coll->set_contended_group(group_index);
1791 } else {
1792 coll->set_contended_group(0); // default contended group
1793 }
1794 coll->set_contended(true);
1795 } else {
1796 coll->set_contended(false);
1797 }
1798 }
1799 }
1800
1801 ClassFileParser::AnnotationCollector::ID
1802 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1803 Symbol* name) {
1804 vmSymbols::SID sid = vmSymbols::find_sid(name);
1805 // Privileged code can use all annotations. Other code silently drops some.
1806 bool privileged = loader_data->is_the_null_class_loader_data() ||
1807 loader_data->is_anonymous();
1808 switch (sid) {
1809 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1810 if (_location != _in_method) break; // only allow for methods
1811 if (!privileged) break; // only allow in privileged code
1812 return _method_ForceInline;
1813 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1814 if (_location != _in_method) break; // only allow for methods
1815 if (!privileged) break; // only allow in privileged code
1816 return _method_DontInline;
1817 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1818 if (_location != _in_method) break; // only allow for methods
1819 if (!privileged) break; // only allow in privileged code
1820 return _method_LambdaForm_Compiled;
1821 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1822 if (_location != _in_method) break; // only allow for methods
1823 if (!privileged) break; // only allow in privileged code
1824 return _method_LambdaForm_Hidden;
1825 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1826 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1827 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1828 return _sun_misc_Contended;
1829 default: break;
1830 }
1831 return AnnotationCollector::_unknown;
1832 }
1833
1834 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1835 if (is_contended())
1836 f->set_contended_group(contended_group());
1837 }
1838
1839 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1840 if (has_annotation(_method_ForceInline))
1841 m->set_force_inline(true);
1842 if (has_annotation(_method_DontInline))
1843 m->set_dont_inline(true);
1844 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1845 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1846 if (has_annotation(_method_LambdaForm_Hidden))
1847 m->set_hidden(true);
1848 }
1849
1850 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1851 k->set_is_contended(is_contended());
1852 }
1853
1854
1855 #define MAX_ARGS_SIZE 255
1856 #define MAX_CODE_SIZE 65535
1857 #define INITIAL_MAX_LVT_NUMBER 256
1858
1859 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1860 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1861 // Method* to save footprint, so we only know the size of the resulting Method* when the
1862 // entire method attribute is parsed.
1863 //
1864 // The promoted_flags parameter is used to pass relevant access_flags
1865 // from the method back up to the containing klass. These flag values
1866 // are added to klass's access_flags.
1867
1868 methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
1869 constantPoolHandle cp,
1870 bool is_interface,
1871 AccessFlags *promoted_flags,
1872 AnnotationArray** method_annotations,
1873 AnnotationArray** method_parameter_annotations,
1874 AnnotationArray** method_default_annotations,
1875 AnnotationArray** method_type_annotations,
1876 TRAPS) {
1877 ClassFileStream* cfs = stream();
1878 methodHandle nullHandle;
1879 ResourceMark rm(THREAD);
1880 // Parse fixed parts
1881 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1882
1883 int flags = cfs->get_u2_fast();
1884 u2 name_index = cfs->get_u2_fast();
1885 int cp_size = cp->length();
1886 check_property(
1887 valid_cp_range(name_index, cp_size) &&
1888 cp->tag_at(name_index).is_utf8(),
1889 "Illegal constant pool index %u for method name in class file %s",
1890 name_index, CHECK_(nullHandle));
1891 Symbol* name = cp->symbol_at(name_index);
1892 verify_legal_method_name(name, CHECK_(nullHandle));
1893
1894 u2 signature_index = cfs->get_u2_fast();
1895 guarantee_property(
1896 valid_cp_range(signature_index, cp_size) &&
1897 cp->tag_at(signature_index).is_utf8(),
1898 "Illegal constant pool index %u for method signature in class file %s",
1899 signature_index, CHECK_(nullHandle));
1900 Symbol* signature = cp->symbol_at(signature_index);
1901
1902 AccessFlags access_flags;
1903 if (name == vmSymbols::class_initializer_name()) {
1904 // We ignore the other access flags for a valid class initializer.
1905 // (JVM Spec 2nd ed., chapter 4.6)
1906 if (_major_version < 51) { // backward compatibility
1907 flags = JVM_ACC_STATIC;
1908 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1909 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1910 }
1911 } else {
1912 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1913 }
1914
1915 int args_size = -1; // only used when _need_verify is true
1916 if (_need_verify) {
1917 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1918 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1919 if (args_size > MAX_ARGS_SIZE) {
1920 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1921 }
1922 }
1923
1924 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1925
1926 // Default values for code and exceptions attribute elements
1927 u2 max_stack = 0;
1928 u2 max_locals = 0;
1929 u4 code_length = 0;
1930 u1* code_start = 0;
1931 u2 exception_table_length = 0;
1932 u2* exception_table_start = NULL;
1933 Array<int>* exception_handlers = Universe::the_empty_int_array();
1934 u2 checked_exceptions_length = 0;
1935 u2* checked_exceptions_start = NULL;
1936 CompressedLineNumberWriteStream* linenumber_table = NULL;
1937 int linenumber_table_length = 0;
1938 int total_lvt_length = 0;
1939 u2 lvt_cnt = 0;
1940 u2 lvtt_cnt = 0;
1941 bool lvt_allocated = false;
1942 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1943 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1944 u2* localvariable_table_length;
1945 u2** localvariable_table_start;
1946 u2* localvariable_type_table_length;
1947 u2** localvariable_type_table_start;
1948 u2 method_parameters_length = 0;
1949 u1* method_parameters_data = NULL;
1950 bool parsed_code_attribute = false;
1951 bool parsed_checked_exceptions_attribute = false;
1952 bool parsed_stackmap_attribute = false;
1953 // stackmap attribute - JDK1.5
1954 Array<u1>* stackmap_data = NULL;
1955 u2 generic_signature_index = 0;
1956 MethodAnnotationCollector parsed_annotations;
1957 u1* runtime_visible_annotations = NULL;
1958 int runtime_visible_annotations_length = 0;
1959 u1* runtime_invisible_annotations = NULL;
1960 int runtime_invisible_annotations_length = 0;
1961 u1* runtime_visible_parameter_annotations = NULL;
1962 int runtime_visible_parameter_annotations_length = 0;
1963 u1* runtime_invisible_parameter_annotations = NULL;
1964 int runtime_invisible_parameter_annotations_length = 0;
1965 u1* runtime_visible_type_annotations = NULL;
1966 int runtime_visible_type_annotations_length = 0;
1967 u1* runtime_invisible_type_annotations = NULL;
1968 int runtime_invisible_type_annotations_length = 0;
1969 u1* annotation_default = NULL;
1970 int annotation_default_length = 0;
1971
1972 // Parse code and exceptions attribute
1973 u2 method_attributes_count = cfs->get_u2_fast();
1974 while (method_attributes_count--) {
1975 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1976 u2 method_attribute_name_index = cfs->get_u2_fast();
1977 u4 method_attribute_length = cfs->get_u4_fast();
1978 check_property(
1979 valid_cp_range(method_attribute_name_index, cp_size) &&
1980 cp->tag_at(method_attribute_name_index).is_utf8(),
1981 "Invalid method attribute name index %u in class file %s",
1982 method_attribute_name_index, CHECK_(nullHandle));
1983
1984 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1985 if (method_attribute_name == vmSymbols::tag_code()) {
1986 // Parse Code attribute
1987 if (_need_verify) {
1988 guarantee_property(
1989 !access_flags.is_native() && !access_flags.is_abstract(),
1990 "Code attribute in native or abstract methods in class file %s",
1991 CHECK_(nullHandle));
1992 }
1993 if (parsed_code_attribute) {
1994 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1995 }
1996 parsed_code_attribute = true;
1997
1998 // Stack size, locals size, and code size
1999 if (_major_version == 45 && _minor_version <= 2) {
2000 cfs->guarantee_more(4, CHECK_(nullHandle));
2001 max_stack = cfs->get_u1_fast();
2002 max_locals = cfs->get_u1_fast();
2003 code_length = cfs->get_u2_fast();
2004 } else {
2005 cfs->guarantee_more(8, CHECK_(nullHandle));
2006 max_stack = cfs->get_u2_fast();
2007 max_locals = cfs->get_u2_fast();
2008 code_length = cfs->get_u4_fast();
2009 }
2010 if (_need_verify) {
2011 guarantee_property(args_size <= max_locals,
2012 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2013 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2014 "Invalid method Code length %u in class file %s",
2015 code_length, CHECK_(nullHandle));
2016 }
2017 // Code pointer
2018 code_start = cfs->get_u1_buffer();
2019 assert(code_start != NULL, "null code start");
2020 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2021 cfs->skip_u1_fast(code_length);
2022
2023 // Exception handler table
2024 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2025 exception_table_length = cfs->get_u2_fast();
2026 if (exception_table_length > 0) {
2027 exception_table_start =
2028 parse_exception_table(loader_data, code_length, exception_table_length, cp, CHECK_(nullHandle));
2029 }
2030
2031 // Parse additional attributes in code attribute
2032 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2033 u2 code_attributes_count = cfs->get_u2_fast();
2034
2035 unsigned int calculated_attribute_length = 0;
2036
2037 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2038 calculated_attribute_length =
2039 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2040 } else {
2041 // max_stack, locals and length are smaller in pre-version 45.2 classes
2042 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2043 }
2044 calculated_attribute_length +=
2045 code_length +
2046 sizeof(exception_table_length) +
2047 sizeof(code_attributes_count) +
2048 exception_table_length *
2049 ( sizeof(u2) + // start_pc
2050 sizeof(u2) + // end_pc
2051 sizeof(u2) + // handler_pc
2052 sizeof(u2) ); // catch_type_index
2053
2054 while (code_attributes_count--) {
2055 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2056 u2 code_attribute_name_index = cfs->get_u2_fast();
2057 u4 code_attribute_length = cfs->get_u4_fast();
2058 calculated_attribute_length += code_attribute_length +
2059 sizeof(code_attribute_name_index) +
2060 sizeof(code_attribute_length);
2061 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
2062 cp->tag_at(code_attribute_name_index).is_utf8(),
2063 "Invalid code attribute name index %u in class file %s",
2064 code_attribute_name_index,
2065 CHECK_(nullHandle));
2066 if (LoadLineNumberTables &&
2067 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2068 // Parse and compress line number table
2069 parse_linenumber_table(code_attribute_length, code_length,
2070 &linenumber_table, CHECK_(nullHandle));
2071
2072 } else if (LoadLocalVariableTables &&
2073 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2074 // Parse local variable table
2075 if (!lvt_allocated) {
2076 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2077 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2078 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2079 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2080 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2081 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2082 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2083 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2084 lvt_allocated = true;
2085 }
2086 if (lvt_cnt == max_lvt_cnt) {
2087 max_lvt_cnt <<= 1;
2088 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2089 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2090 }
2091 localvariable_table_start[lvt_cnt] =
2092 parse_localvariable_table(code_length,
2093 max_locals,
2094 code_attribute_length,
2095 cp,
2096 &localvariable_table_length[lvt_cnt],
2097 false, // is not LVTT
2098 CHECK_(nullHandle));
2099 total_lvt_length += localvariable_table_length[lvt_cnt];
2100 lvt_cnt++;
2101 } else if (LoadLocalVariableTypeTables &&
2102 _major_version >= JAVA_1_5_VERSION &&
2103 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2104 if (!lvt_allocated) {
2105 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2106 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2107 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2108 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2109 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2110 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2111 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2112 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2113 lvt_allocated = true;
2114 }
2115 // Parse local variable type table
2116 if (lvtt_cnt == max_lvtt_cnt) {
2117 max_lvtt_cnt <<= 1;
2118 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2119 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2120 }
2121 localvariable_type_table_start[lvtt_cnt] =
2122 parse_localvariable_table(code_length,
2123 max_locals,
2124 code_attribute_length,
2125 cp,
2126 &localvariable_type_table_length[lvtt_cnt],
2127 true, // is LVTT
2128 CHECK_(nullHandle));
2129 lvtt_cnt++;
2130 } else if (UseSplitVerifier &&
2131 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2132 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2133 // Stack map is only needed by the new verifier in JDK1.5.
2134 if (parsed_stackmap_attribute) {
2135 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2136 }
2137 stackmap_data = parse_stackmap_table(loader_data, code_attribute_length, CHECK_(nullHandle));
2138 parsed_stackmap_attribute = true;
2139 } else {
2140 // Skip unknown attributes
2141 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2142 }
2143 }
2144 // check method attribute length
2145 if (_need_verify) {
2146 guarantee_property(method_attribute_length == calculated_attribute_length,
2147 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2148 }
2149 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2150 // Parse Exceptions attribute
2151 if (parsed_checked_exceptions_attribute) {
2152 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2153 }
2154 parsed_checked_exceptions_attribute = true;
2155 checked_exceptions_start =
2156 parse_checked_exceptions(&checked_exceptions_length,
2157 method_attribute_length,
2158 cp, CHECK_(nullHandle));
2159 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2160 method_parameters_length = cfs->get_u1_fast();
2161 // Track the actual size (note: this is written for clarity; a
2162 // decent compiler will CSE and constant-fold this into a single
2163 // expression)
2164 u2 actual_size = 1;
2165 method_parameters_data = cfs->get_u1_buffer();
2166 actual_size += 2 * method_parameters_length;
2167 cfs->skip_u2_fast(method_parameters_length);
2168 actual_size += 4 * method_parameters_length;
2169 cfs->skip_u4_fast(method_parameters_length);
2170 // Enforce attribute length
2171 if (method_attribute_length != actual_size) {
2172 classfile_parse_error(
2173 "Invalid MethodParameters method attribute length %u in class file %s",
2174 method_attribute_length, CHECK_(nullHandle));
2175 }
2176 // ignore this attribute if it cannot be reflected
2177 if (!SystemDictionary::Parameter_klass_loaded())
2178 method_parameters_length = 0;
2179 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2180 if (method_attribute_length != 0) {
2181 classfile_parse_error(
2182 "Invalid Synthetic method attribute length %u in class file %s",
2183 method_attribute_length, CHECK_(nullHandle));
2184 }
2185 // Should we check that there hasn't already been a synthetic attribute?
2186 access_flags.set_is_synthetic();
2187 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2188 if (method_attribute_length != 0) {
2189 classfile_parse_error(
2190 "Invalid Deprecated method attribute length %u in class file %s",
2191 method_attribute_length, CHECK_(nullHandle));
2192 }
2193 } else if (_major_version >= JAVA_1_5_VERSION) {
2194 if (method_attribute_name == vmSymbols::tag_signature()) {
2195 if (method_attribute_length != 2) {
2196 classfile_parse_error(
2197 "Invalid Signature attribute length %u in class file %s",
2198 method_attribute_length, CHECK_(nullHandle));
2199 }
2200 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2201 generic_signature_index = cfs->get_u2_fast();
2202 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2203 runtime_visible_annotations_length = method_attribute_length;
2204 runtime_visible_annotations = cfs->get_u1_buffer();
2205 assert(runtime_visible_annotations != NULL, "null visible annotations");
2206 parse_annotations(loader_data,
2207 runtime_visible_annotations,
2208 runtime_visible_annotations_length, cp, &parsed_annotations,
2209 CHECK_(nullHandle));
2210 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2211 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2212 runtime_invisible_annotations_length = method_attribute_length;
2213 runtime_invisible_annotations = cfs->get_u1_buffer();
2214 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2215 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2216 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2217 runtime_visible_parameter_annotations_length = method_attribute_length;
2218 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2219 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2220 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2221 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2222 runtime_invisible_parameter_annotations_length = method_attribute_length;
2223 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2224 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2225 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2226 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2227 annotation_default_length = method_attribute_length;
2228 annotation_default = cfs->get_u1_buffer();
2229 assert(annotation_default != NULL, "null annotation default");
2230 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2231 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2232 runtime_visible_type_annotations_length = method_attribute_length;
2233 runtime_visible_type_annotations = cfs->get_u1_buffer();
2234 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2235 // No need for the VM to parse Type annotations
2236 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2237 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2238 runtime_invisible_type_annotations_length = method_attribute_length;
2239 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2240 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2241 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2242 } else {
2243 // Skip unknown attributes
2244 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2245 }
2246 } else {
2247 // Skip unknown attributes
2248 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2249 }
2250 }
2251
2252 if (linenumber_table != NULL) {
2253 linenumber_table->write_terminator();
2254 linenumber_table_length = linenumber_table->position();
2255 }
2256
2257 // Make sure there's at least one Code attribute in non-native/non-abstract method
2258 if (_need_verify) {
2259 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2260 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2261 }
2262
2263 // All sizing information for a Method* is finally available, now create it
2264 Method* m = Method::allocate(
2265 loader_data, code_length, access_flags, linenumber_table_length,
2266 total_lvt_length, exception_table_length, checked_exceptions_length,
2267 method_parameters_length, generic_signature_index,
2268 ConstMethod::NORMAL, CHECK_(nullHandle));
2269
2270 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2271
2272 // Fill in information from fixed part (access_flags already set)
2273 m->set_constants(cp());
2274 m->set_name_index(name_index);
2275 m->set_signature_index(signature_index);
2276 #ifdef CC_INTERP
2277 // hmm is there a gc issue here??
2278 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2279 m->set_result_index(rtf.type());
2280 #endif
2281
2282 if (args_size >= 0) {
2283 m->set_size_of_parameters(args_size);
2284 } else {
2285 m->compute_size_of_parameters(THREAD);
2286 }
2287 #ifdef ASSERT
2288 if (args_size >= 0) {
2289 m->compute_size_of_parameters(THREAD);
2290 assert(args_size == m->size_of_parameters(), "");
2291 }
2292 #endif
2293
2294 // Fill in code attribute information
2295 m->set_max_stack(max_stack);
2296 m->set_max_locals(max_locals);
2297 m->constMethod()->set_stackmap_data(stackmap_data);
2298
2299 // Copy byte codes
2300 m->set_code(code_start);
2301
2302 // Copy line number table
2303 if (linenumber_table != NULL) {
2304 memcpy(m->compressed_linenumber_table(),
2305 linenumber_table->buffer(), linenumber_table_length);
2306 }
2307
2308 // Copy exception table
2309 if (exception_table_length > 0) {
2310 int size =
2311 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2312 copy_u2_with_conversion((u2*) m->exception_table_start(),
2313 exception_table_start, size);
2314 }
2315
2316 // Copy method parameters
2317 if (method_parameters_length > 0) {
2318 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2319 for(int i = 0; i < method_parameters_length; i++) {
2320 elem[i].name_cp_index =
2321 Bytes::get_Java_u2(method_parameters_data);
2322 method_parameters_data += 2;
2323 u4 flags = Bytes::get_Java_u4(method_parameters_data);
2324 // This caused an alignment fault on Sparc, if flags was a u4
2325 elem[i].flags_lo = extract_low_short_from_int(flags);
2326 elem[i].flags_hi = extract_high_short_from_int(flags);
2327 method_parameters_data += 4;
2328 }
2329 }
2330
2331 // Copy checked exceptions
2332 if (checked_exceptions_length > 0) {
2333 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2334 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2335 }
2336
2337 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2338 *
2339 * Rules for LVT's and LVTT's are:
2340 * - There can be any number of LVT's and LVTT's.
2341 * - If there are n LVT's, it is the same as if there was just
2342 * one LVT containing all the entries from the n LVT's.
2343 * - There may be no more than one LVT entry per local variable.
2344 * Two LVT entries are 'equal' if these fields are the same:
2345 * start_pc, length, name, slot
2346 * - There may be no more than one LVTT entry per each LVT entry.
2347 * Each LVTT entry has to match some LVT entry.
2348 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2349 */
2350 if (total_lvt_length > 0) {
2351 int tbl_no, idx;
2352
2353 promoted_flags->set_has_localvariable_table();
2354
2355 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2356 initialize_hashtable(lvt_Hash);
2357
2358 // To fill LocalVariableTable in
2359 Classfile_LVT_Element* cf_lvt;
2360 LocalVariableTableElement* lvt = m->localvariable_table_start();
2361
2362 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2363 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2364 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2365 copy_lvt_element(&cf_lvt[idx], lvt);
2366 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2367 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2368 && _need_verify
2369 && _major_version >= JAVA_1_5_VERSION ) {
2370 clear_hashtable(lvt_Hash);
2371 classfile_parse_error("Duplicated LocalVariableTable attribute "
2372 "entry for '%s' in class file %s",
2373 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2374 CHECK_(nullHandle));
2375 }
2376 }
2377 }
2378
2379 // To merge LocalVariableTable and LocalVariableTypeTable
2380 Classfile_LVT_Element* cf_lvtt;
2381 LocalVariableTableElement lvtt_elem;
2382
2383 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2384 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2385 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2386 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2387 int index = hash(&lvtt_elem);
2388 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2389 if (entry == NULL) {
2390 if (_need_verify) {
2391 clear_hashtable(lvt_Hash);
2392 classfile_parse_error("LVTT entry for '%s' in class file %s "
2393 "does not match any LVT entry",
2394 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2395 CHECK_(nullHandle));
2396 }
2397 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2398 clear_hashtable(lvt_Hash);
2399 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2400 "entry for '%s' in class file %s",
2401 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2402 CHECK_(nullHandle));
2403 } else {
2404 // to add generic signatures into LocalVariableTable
2405 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2406 }
2407 }
2408 }
2409 clear_hashtable(lvt_Hash);
2410 }
2411
2412 if (parsed_annotations.has_any_annotations())
2413 parsed_annotations.apply_to(m);
2414 *method_annotations = assemble_annotations(loader_data,
2415 runtime_visible_annotations,
2416 runtime_visible_annotations_length,
2417 runtime_invisible_annotations,
2418 runtime_invisible_annotations_length,
2419 CHECK_(nullHandle));
2420 *method_parameter_annotations = assemble_annotations(loader_data,
2421 runtime_visible_parameter_annotations,
2422 runtime_visible_parameter_annotations_length,
2423 runtime_invisible_parameter_annotations,
2424 runtime_invisible_parameter_annotations_length,
2425 CHECK_(nullHandle));
2426 *method_default_annotations = assemble_annotations(loader_data,
2427 annotation_default,
2428 annotation_default_length,
2429 NULL,
2430 0,
2431 CHECK_(nullHandle));
2432 *method_type_annotations = assemble_annotations(loader_data,
2433 runtime_visible_type_annotations,
2434 runtime_visible_type_annotations_length,
2435 runtime_invisible_type_annotations,
2436 runtime_invisible_type_annotations_length,
2437 CHECK_(nullHandle));
2438
2439 if (name == vmSymbols::finalize_method_name() &&
2440 signature == vmSymbols::void_method_signature()) {
2441 if (m->is_empty_method()) {
2442 _has_empty_finalizer = true;
2443 } else {
2444 _has_finalizer = true;
2445 }
2446 }
2447 if (name == vmSymbols::object_initializer_name() &&
2448 signature == vmSymbols::void_method_signature() &&
2449 m->is_vanilla_constructor()) {
2450 _has_vanilla_constructor = true;
2451 }
2452
2453 return m;
2454 }
2455
2456
2457 // The promoted_flags parameter is used to pass relevant access_flags
2458 // from the methods back up to the containing klass. These flag values
2459 // are added to klass's access_flags.
2460
2461 Array<Method*>* ClassFileParser::parse_methods(ClassLoaderData* loader_data,
2462 constantPoolHandle cp,
2463 bool is_interface,
2464 AccessFlags* promoted_flags,
2465 bool* has_final_method,
2466 Array<AnnotationArray*>** methods_annotations,
2467 Array<AnnotationArray*>** methods_parameter_annotations,
2468 Array<AnnotationArray*>** methods_default_annotations,
2469 Array<AnnotationArray*>** methods_type_annotations,
2470 bool* has_default_methods,
2471 TRAPS) {
2472 ClassFileStream* cfs = stream();
2473 AnnotationArray* method_annotations = NULL;
2474 AnnotationArray* method_parameter_annotations = NULL;
2475 AnnotationArray* method_default_annotations = NULL;
2476 AnnotationArray* method_type_annotations = NULL;
2477 cfs->guarantee_more(2, CHECK_NULL); // length
2478 u2 length = cfs->get_u2_fast();
2479 if (length == 0) {
2480 return Universe::the_empty_method_array();
2481 } else {
2482 // FIXME: Handle leaks at later failures.
2483 Array<Method*>* methods = MetadataFactory::new_array<Method*>(loader_data, length, NULL, CHECK_NULL);
2484
2485 HandleMark hm(THREAD);
2486 for (int index = 0; index < length; index++) {
2487 methodHandle method = parse_method(loader_data,
2488 cp, is_interface,
2489 promoted_flags,
2490 &method_annotations,
2491 &method_parameter_annotations,
2492 &method_default_annotations,
2493 &method_type_annotations,
2494 CHECK_NULL);
2495
2496 if (method->is_final()) {
2497 *has_final_method = true;
2498 }
2499 if (is_interface && !method->is_abstract() && !method->is_static()) {
2500 // default method
2501 *has_default_methods = true;
2502 }
2503 methods->at_put(index, method());
2504
2505 if (method_annotations != NULL) {
2506 if (*methods_annotations == NULL) {
2507 *methods_annotations =
2508 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2509 }
2510 (*methods_annotations)->at_put(index, method_annotations);
2511 }
2512
2513 if (method_parameter_annotations != NULL) {
2514 if (*methods_parameter_annotations == NULL) {
2515 *methods_parameter_annotations =
2516 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2517 }
2518 (*methods_parameter_annotations)->at_put(index, method_parameter_annotations);
2519 }
2520
2521 if (method_default_annotations != NULL) {
2522 if (*methods_default_annotations == NULL) {
2523 *methods_default_annotations =
2524 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2525 }
2526 (*methods_default_annotations)->at_put(index, method_default_annotations);
2527 }
2528
2529 if (method_type_annotations != NULL) {
2530 if (*methods_type_annotations == NULL) {
2531 *methods_type_annotations =
2532 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2533 }
2534 (*methods_type_annotations)->at_put(index, method_type_annotations);
2535 }
2536 }
2537
2538 if (_need_verify && length > 1) {
2539 // Check duplicated methods
2540 ResourceMark rm(THREAD);
2541 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2542 THREAD, NameSigHash*, HASH_ROW_SIZE);
2543 initialize_hashtable(names_and_sigs);
2544 bool dup = false;
2545 {
2546 debug_only(No_Safepoint_Verifier nsv;)
2547 for (int i = 0; i < length; i++) {
2548 Method* m = methods->at(i);
2549 // If no duplicates, add name/signature in hashtable names_and_sigs.
2550 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2551 dup = true;
2552 break;
2553 }
2554 }
2555 }
2556 if (dup) {
2557 classfile_parse_error("Duplicate method name&signature in class file %s",
2558 CHECK_NULL);
2559 }
2560 }
2561 return methods;
2562 }
2563 }
2564
2565
2566 Array<int>* ClassFileParser::sort_methods(ClassLoaderData* loader_data,
2567 Array<Method*>* methods,
2568 Array<AnnotationArray*>* methods_annotations,
2569 Array<AnnotationArray*>* methods_parameter_annotations,
2570 Array<AnnotationArray*>* methods_default_annotations,
2571 Array<AnnotationArray*>* methods_type_annotations,
2572 TRAPS) {
2573 int length = methods->length();
2574 // If JVMTI original method ordering or sharing is enabled we have to
2575 // remember the original class file ordering.
2576 // We temporarily use the vtable_index field in the Method* to store the
2577 // class file index, so we can read in after calling qsort.
2578 // Put the method ordering in the shared archive.
2579 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2580 for (int index = 0; index < length; index++) {
2581 Method* m = methods->at(index);
2582 assert(!m->valid_vtable_index(), "vtable index should not be set");
2583 m->set_vtable_index(index);
2584 }
2585 }
2586 // Sort method array by ascending method name (for faster lookups & vtable construction)
2587 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2588 Method::sort_methods(methods, methods_annotations,
2589 methods_parameter_annotations,
2590 methods_default_annotations,
2591 methods_type_annotations);
2592
2593 // If JVMTI original method ordering or sharing is enabled construct int
2594 // array remembering the original ordering
2595 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2596 Array<int>* method_ordering = MetadataFactory::new_array<int>(loader_data, length, CHECK_NULL);
2597 for (int index = 0; index < length; index++) {
2598 Method* m = methods->at(index);
2599 int old_index = m->vtable_index();
2600 assert(old_index >= 0 && old_index < length, "invalid method index");
2601 method_ordering->at_put(index, old_index);
2602 m->set_vtable_index(Method::invalid_vtable_index);
2603 }
2604 return method_ordering;
2605 } else {
2606 return Universe::the_empty_int_array();
2607 }
2608 }
2609
2610
2611 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, TRAPS) {
2612 ClassFileStream* cfs = stream();
2613 cfs->guarantee_more(2, CHECK); // sourcefile_index
2614 u2 sourcefile_index = cfs->get_u2_fast();
2615 check_property(
2616 valid_cp_range(sourcefile_index, cp->length()) &&
2617 cp->tag_at(sourcefile_index).is_utf8(),
2618 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2619 sourcefile_index, CHECK);
2620 set_class_sourcefile(cp->symbol_at(sourcefile_index));
2621 }
2622
2623
2624
2625 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2626 int length, TRAPS) {
2627 ClassFileStream* cfs = stream();
2628 u1* sde_buffer = cfs->get_u1_buffer();
2629 assert(sde_buffer != NULL, "null sde buffer");
2630
2631 // Don't bother storing it if there is no way to retrieve it
2632 if (JvmtiExport::can_get_source_debug_extension()) {
2633 assert((length+1) > length, "Overflow checking");
2634 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2635 for (int i = 0; i < length; i++) {
2636 sde[i] = sde_buffer[i];
2637 }
2638 sde[length] = '\0';
2639 set_class_sde_buffer((char*)sde, length);
2640 }
2641 // Got utf8 string, set stream position forward
2642 cfs->skip_u1(length, CHECK);
2643 }
2644
2645
2646 // Inner classes can be static, private or protected (classic VM does this)
2647 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2648
2649 // Return number of classes in the inner classes attribute table
2650 u2 ClassFileParser::parse_classfile_inner_classes_attribute(ClassLoaderData* loader_data,
2651 u1* inner_classes_attribute_start,
2652 bool parsed_enclosingmethod_attribute,
2653 u2 enclosing_method_class_index,
2654 u2 enclosing_method_method_index,
2655 constantPoolHandle cp,
2656 TRAPS) {
2657 ClassFileStream* cfs = stream();
2658 u1* current_mark = cfs->current();
2659 u2 length = 0;
2660 if (inner_classes_attribute_start != NULL) {
2661 cfs->set_current(inner_classes_attribute_start);
2662 cfs->guarantee_more(2, CHECK_0); // length
2663 length = cfs->get_u2_fast();
2664 }
2665
2666 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2667 // method data:
2668 // [inner_class_info_index,
2669 // outer_class_info_index,
2670 // inner_name_index,
2671 // inner_class_access_flags,
2672 // ...
2673 // enclosing_method_class_index,
2674 // enclosing_method_method_index]
2675 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2676 // FIXME: Will leak on exceptions.
2677 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(loader_data, size, CHECK_0);
2678 int index = 0;
2679 int cp_size = cp->length();
2680 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2681 for (int n = 0; n < length; n++) {
2682 // Inner class index
2683 u2 inner_class_info_index = cfs->get_u2_fast();
2684 check_property(
2685 inner_class_info_index == 0 ||
2686 (valid_cp_range(inner_class_info_index, cp_size) &&
2687 is_klass_reference(cp, inner_class_info_index)),
2688 "inner_class_info_index %u has bad constant type in class file %s",
2689 inner_class_info_index, CHECK_0);
2690 // Outer class index
2691 u2 outer_class_info_index = cfs->get_u2_fast();
2692 check_property(
2693 outer_class_info_index == 0 ||
2694 (valid_cp_range(outer_class_info_index, cp_size) &&
2695 is_klass_reference(cp, outer_class_info_index)),
2696 "outer_class_info_index %u has bad constant type in class file %s",
2697 outer_class_info_index, CHECK_0);
2698 // Inner class name
2699 u2 inner_name_index = cfs->get_u2_fast();
2700 check_property(
2701 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2702 cp->tag_at(inner_name_index).is_utf8()),
2703 "inner_name_index %u has bad constant type in class file %s",
2704 inner_name_index, CHECK_0);
2705 if (_need_verify) {
2706 guarantee_property(inner_class_info_index != outer_class_info_index,
2707 "Class is both outer and inner class in class file %s", CHECK_0);
2708 }
2709 // Access flags
2710 AccessFlags inner_access_flags;
2711 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2712 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2713 // Set abstract bit for old class files for backward compatibility
2714 flags |= JVM_ACC_ABSTRACT;
2715 }
2716 verify_legal_class_modifiers(flags, CHECK_0);
2717 inner_access_flags.set_flags(flags);
2718
2719 inner_classes->at_put(index++, inner_class_info_index);
2720 inner_classes->at_put(index++, outer_class_info_index);
2721 inner_classes->at_put(index++, inner_name_index);
2722 inner_classes->at_put(index++, inner_access_flags.as_short());
2723 }
2724
2725 // 4347400: make sure there's no duplicate entry in the classes array
2726 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2727 for(int i = 0; i < length * 4; i += 4) {
2728 for(int j = i + 4; j < length * 4; j += 4) {
2729 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2730 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2731 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2732 inner_classes->at(i+3) != inner_classes->at(j+3)),
2733 "Duplicate entry in InnerClasses in class file %s",
2734 CHECK_0);
2735 }
2736 }
2737 }
2738
2739 // Set EnclosingMethod class and method indexes.
2740 if (parsed_enclosingmethod_attribute) {
2741 inner_classes->at_put(index++, enclosing_method_class_index);
2742 inner_classes->at_put(index++, enclosing_method_method_index);
2743 }
2744 assert(index == size, "wrong size");
2745
2746 // Update InstanceKlass with inner class info.
2747 set_class_inner_classes(inner_classes);
2748
2749 // Restore buffer's current position.
2750 cfs->set_current(current_mark);
2751
2752 return length;
2753 }
2754
2755 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, TRAPS) {
2756 set_class_synthetic_flag(true);
2757 }
2758
2759 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, TRAPS) {
2760 ClassFileStream* cfs = stream();
2761 u2 signature_index = cfs->get_u2(CHECK);
2762 check_property(
2763 valid_cp_range(signature_index, cp->length()) &&
2764 cp->tag_at(signature_index).is_utf8(),
2765 "Invalid constant pool index %u in Signature attribute in class file %s",
2766 signature_index, CHECK);
2767 set_class_generic_signature(cp->symbol_at(signature_index));
2768 }
2769
2770 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(ClassLoaderData* loader_data,
2771 constantPoolHandle cp,
2772 u4 attribute_byte_length, TRAPS) {
2773 ClassFileStream* cfs = stream();
2774 u1* current_start = cfs->current();
2775
2776 cfs->guarantee_more(2, CHECK); // length
2777 int attribute_array_length = cfs->get_u2_fast();
2778
2779 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2780 "Short length on BootstrapMethods in class file %s",
2781 CHECK);
2782
2783 // The attribute contains a counted array of counted tuples of shorts,
2784 // represending bootstrap specifiers:
2785 // length*{bootstrap_method_index, argument_count*{argument_index}}
2786 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2787 // operand_count = number of shorts in attr, except for leading length
2788
2789 // The attribute is copied into a short[] array.
2790 // The array begins with a series of short[2] pairs, one for each tuple.
2791 int index_size = (attribute_array_length * 2);
2792
2793 Array<u2>* operands = MetadataFactory::new_array<u2>(loader_data, index_size + operand_count, CHECK);
2794
2795 int operand_fill_index = index_size;
2796 int cp_size = cp->length();
2797
2798 for (int n = 0; n < attribute_array_length; n++) {
2799 // Store a 32-bit offset into the header of the operand array.
2800 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2801
2802 // Read a bootstrap specifier.
2803 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2804 u2 bootstrap_method_index = cfs->get_u2_fast();
2805 u2 argument_count = cfs->get_u2_fast();
2806 check_property(
2807 valid_cp_range(bootstrap_method_index, cp_size) &&
2808 cp->tag_at(bootstrap_method_index).is_method_handle(),
2809 "bootstrap_method_index %u has bad constant type in class file %s",
2810 bootstrap_method_index,
2811 CHECK);
2812 operands->at_put(operand_fill_index++, bootstrap_method_index);
2813 operands->at_put(operand_fill_index++, argument_count);
2814
2815 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2816 for (int j = 0; j < argument_count; j++) {
2817 u2 argument_index = cfs->get_u2_fast();
2818 check_property(
2819 valid_cp_range(argument_index, cp_size) &&
2820 cp->tag_at(argument_index).is_loadable_constant(),
2821 "argument_index %u has bad constant type in class file %s",
2822 argument_index,
2823 CHECK);
2824 operands->at_put(operand_fill_index++, argument_index);
2825 }
2826 }
2827
2828 assert(operand_fill_index == operands->length(), "exact fill");
2829 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2830
2831 u1* current_end = cfs->current();
2832 guarantee_property(current_end == current_start + attribute_byte_length,
2833 "Bad length on BootstrapMethods in class file %s",
2834 CHECK);
2835
2836 cp->set_operands(operands);
2837 }
2838
2839 void ClassFileParser::parse_classfile_attributes(ClassLoaderData* loader_data,
2840 constantPoolHandle cp,
2841 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2842 TRAPS) {
2843 ClassFileStream* cfs = stream();
2844 // Set inner classes attribute to default sentinel
2845 set_class_inner_classes(Universe::the_empty_short_array());
2846 cfs->guarantee_more(2, CHECK); // attributes_count
2847 u2 attributes_count = cfs->get_u2_fast();
2848 bool parsed_sourcefile_attribute = false;
2849 bool parsed_innerclasses_attribute = false;
2850 bool parsed_enclosingmethod_attribute = false;
2851 bool parsed_bootstrap_methods_attribute = false;
2852 u1* runtime_visible_annotations = NULL;
2853 int runtime_visible_annotations_length = 0;
2854 u1* runtime_invisible_annotations = NULL;
2855 int runtime_invisible_annotations_length = 0;
2856 u1* runtime_visible_type_annotations = NULL;
2857 int runtime_visible_type_annotations_length = 0;
2858 u1* runtime_invisible_type_annotations = NULL;
2859 int runtime_invisible_type_annotations_length = 0;
2860 u1* inner_classes_attribute_start = NULL;
2861 u4 inner_classes_attribute_length = 0;
2862 u2 enclosing_method_class_index = 0;
2863 u2 enclosing_method_method_index = 0;
2864 // Iterate over attributes
2865 while (attributes_count--) {
2866 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2867 u2 attribute_name_index = cfs->get_u2_fast();
2868 u4 attribute_length = cfs->get_u4_fast();
2869 check_property(
2870 valid_cp_range(attribute_name_index, cp->length()) &&
2871 cp->tag_at(attribute_name_index).is_utf8(),
2872 "Attribute name has bad constant pool index %u in class file %s",
2873 attribute_name_index, CHECK);
2874 Symbol* tag = cp->symbol_at(attribute_name_index);
2875 if (tag == vmSymbols::tag_source_file()) {
2876 // Check for SourceFile tag
2877 if (_need_verify) {
2878 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2879 }
2880 if (parsed_sourcefile_attribute) {
2881 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2882 } else {
2883 parsed_sourcefile_attribute = true;
2884 }
2885 parse_classfile_sourcefile_attribute(cp, CHECK);
2886 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2887 // Check for SourceDebugExtension tag
2888 parse_classfile_source_debug_extension_attribute(cp, (int)attribute_length, CHECK);
2889 } else if (tag == vmSymbols::tag_inner_classes()) {
2890 // Check for InnerClasses tag
2891 if (parsed_innerclasses_attribute) {
2892 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2893 } else {
2894 parsed_innerclasses_attribute = true;
2895 }
2896 inner_classes_attribute_start = cfs->get_u1_buffer();
2897 inner_classes_attribute_length = attribute_length;
2898 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2899 } else if (tag == vmSymbols::tag_synthetic()) {
2900 // Check for Synthetic tag
2901 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2902 if (attribute_length != 0) {
2903 classfile_parse_error(
2904 "Invalid Synthetic classfile attribute length %u in class file %s",
2905 attribute_length, CHECK);
2906 }
2907 parse_classfile_synthetic_attribute(cp, CHECK);
2908 } else if (tag == vmSymbols::tag_deprecated()) {
2909 // Check for Deprecatd tag - 4276120
2910 if (attribute_length != 0) {
2911 classfile_parse_error(
2912 "Invalid Deprecated classfile attribute length %u in class file %s",
2913 attribute_length, CHECK);
2914 }
2915 } else if (_major_version >= JAVA_1_5_VERSION) {
2916 if (tag == vmSymbols::tag_signature()) {
2917 if (attribute_length != 2) {
2918 classfile_parse_error(
2919 "Wrong Signature attribute length %u in class file %s",
2920 attribute_length, CHECK);
2921 }
2922 parse_classfile_signature_attribute(cp, CHECK);
2923 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2924 runtime_visible_annotations_length = attribute_length;
2925 runtime_visible_annotations = cfs->get_u1_buffer();
2926 assert(runtime_visible_annotations != NULL, "null visible annotations");
2927 parse_annotations(loader_data,
2928 runtime_visible_annotations,
2929 runtime_visible_annotations_length,
2930 cp,
2931 parsed_annotations,
2932 CHECK);
2933 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2934 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2935 runtime_invisible_annotations_length = attribute_length;
2936 runtime_invisible_annotations = cfs->get_u1_buffer();
2937 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2938 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2939 } else if (tag == vmSymbols::tag_enclosing_method()) {
2940 if (parsed_enclosingmethod_attribute) {
2941 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2942 } else {
2943 parsed_enclosingmethod_attribute = true;
2944 }
2945 cfs->guarantee_more(4, CHECK); // class_index, method_index
2946 enclosing_method_class_index = cfs->get_u2_fast();
2947 enclosing_method_method_index = cfs->get_u2_fast();
2948 if (enclosing_method_class_index == 0) {
2949 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2950 }
2951 // Validate the constant pool indices and types
2952 if (!cp->is_within_bounds(enclosing_method_class_index) ||
2953 !is_klass_reference(cp, enclosing_method_class_index)) {
2954 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2955 }
2956 if (enclosing_method_method_index != 0 &&
2957 (!cp->is_within_bounds(enclosing_method_method_index) ||
2958 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2959 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2960 }
2961 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2962 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2963 if (parsed_bootstrap_methods_attribute)
2964 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2965 parsed_bootstrap_methods_attribute = true;
2966 parse_classfile_bootstrap_methods_attribute(loader_data, cp, attribute_length, CHECK);
2967 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2968 runtime_visible_type_annotations_length = attribute_length;
2969 runtime_visible_type_annotations = cfs->get_u1_buffer();
2970 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2971 // No need for the VM to parse Type annotations
2972 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2973 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2974 runtime_invisible_type_annotations_length = attribute_length;
2975 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2976 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2977 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2978 } else {
2979 // Unknown attribute
2980 cfs->skip_u1(attribute_length, CHECK);
2981 }
2982 } else {
2983 // Unknown attribute
2984 cfs->skip_u1(attribute_length, CHECK);
2985 }
2986 }
2987 AnnotationArray* annotations = assemble_annotations(loader_data,
2988 runtime_visible_annotations,
2989 runtime_visible_annotations_length,
2990 runtime_invisible_annotations,
2991 runtime_invisible_annotations_length,
2992 CHECK);
2993 set_class_annotations(annotations);
2994 AnnotationArray* type_annotations = assemble_annotations(loader_data,
2995 runtime_visible_type_annotations,
2996 runtime_visible_type_annotations_length,
2997 runtime_invisible_type_annotations,
2998 runtime_invisible_type_annotations_length,
2999 CHECK);
3000 set_class_type_annotations(type_annotations);
3001
3002 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3003 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3004 loader_data,
3005 inner_classes_attribute_start,
3006 parsed_innerclasses_attribute,
3007 enclosing_method_class_index,
3008 enclosing_method_method_index,
3009 cp, CHECK);
3010 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3011 guarantee_property(
3012 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3013 "Wrong InnerClasses attribute length in class file %s", CHECK);
3014 }
3015 }
3016
3017 if (_max_bootstrap_specifier_index >= 0) {
3018 guarantee_property(parsed_bootstrap_methods_attribute,
3019 "Missing BootstrapMethods attribute in class file %s", CHECK);
3020 }
3021 }
3022
3023 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3024 if (_synthetic_flag)
3025 k->set_is_synthetic();
3026 if (_sourcefile != NULL) {
3027 _sourcefile->increment_refcount();
3028 k->set_source_file_name(_sourcefile);
3029 }
3030 if (_generic_signature != NULL) {
3031 _generic_signature->increment_refcount();
3032 k->set_generic_signature(_generic_signature);
3033 }
3034 if (_sde_buffer != NULL) {
3035 k->set_source_debug_extension(_sde_buffer, _sde_length);
3036 }
3037 k->set_inner_classes(_inner_classes);
3038 if (_annotations != NULL) {
3039 k->annotations()->set_class_annotations(_annotations);
3040 }
3041 }
3042
3043 AnnotationArray* ClassFileParser::assemble_annotations(ClassLoaderData* loader_data,
3044 u1* runtime_visible_annotations,
3045 int runtime_visible_annotations_length,
3046 u1* runtime_invisible_annotations,
3047 int runtime_invisible_annotations_length, TRAPS) {
3048 AnnotationArray* annotations = NULL;
3049 if (runtime_visible_annotations != NULL ||
3050 runtime_invisible_annotations != NULL) {
3051 annotations = MetadataFactory::new_array<u1>(loader_data,
3052 runtime_visible_annotations_length +
3053 runtime_invisible_annotations_length,
3054 CHECK_(annotations));
3055 if (runtime_visible_annotations != NULL) {
3056 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3057 annotations->at_put(i, runtime_visible_annotations[i]);
3058 }
3059 }
3060 if (runtime_invisible_annotations != NULL) {
3061 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3062 int append = runtime_visible_annotations_length+i;
3063 annotations->at_put(append, runtime_invisible_annotations[i]);
3064 }
3065 }
3066 }
3067 return annotations;
3068 }
3069
3070
3071 #ifndef PRODUCT
3072 static void parseAndPrintGenericSignatures(
3073 instanceKlassHandle this_klass, TRAPS) {
3074 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3075 ResourceMark rm;
3076
3077 if (this_klass->generic_signature() != NULL) {
3078 using namespace generic;
3079 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3080
3081 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3082 spec->print_on(tty);
3083
3084 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3085 Method* m = this_klass->methods()->at(i);
3086 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3087 Symbol* sig = m->generic_signature();
3088 if (sig == NULL) {
3089 sig = m->signature();
3090 }
3091 tty->print_cr("Parsing %s", sig->as_C_string());
3092 method_spec->print_on(tty);
3093 }
3094 }
3095 }
3096 #endif // ndef PRODUCT
3097
3098
3099 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3100 ClassLoaderData* loader_data,
3101 Handle protection_domain,
3102 KlassHandle host_klass,
3103 GrowableArray<Handle>* cp_patches,
3104 TempNewSymbol& parsed_name,
3105 bool verify,
3106 TRAPS) {
3107
3108 // When a retransformable agent is attached, JVMTI caches the
3109 // class bytes that existed before the first retransformation.
3110 // If RedefineClasses() was used before the retransformable
3111 // agent attached, then the cached class bytes may not be the
3112 // original class bytes.
3113 unsigned char *cached_class_file_bytes = NULL;
3114 jint cached_class_file_length;
3115 Handle class_loader(THREAD, loader_data->class_loader());
3116 bool has_default_methods = false;
3117 ResourceMark rm(THREAD);
3118
3119 ClassFileStream* cfs = stream();
3120 // Timing
3121 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3122 JavaThread* jt = (JavaThread*) THREAD;
3123
3124 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3125 ClassLoader::perf_class_parse_selftime(),
3126 NULL,
3127 jt->get_thread_stat()->perf_recursion_counts_addr(),
3128 jt->get_thread_stat()->perf_timers_addr(),
3129 PerfClassTraceTime::PARSE_CLASS);
3130
3131 init_parsed_class_attributes();
3132
3133 if (JvmtiExport::should_post_class_file_load_hook()) {
3134 // Get the cached class file bytes (if any) from the class that
3135 // is being redefined or retransformed. We use jvmti_thread_state()
3136 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3137 // a JvmtiThreadState any earlier than necessary. This will help
3138 // avoid the bug described by 7126851.
3139 JvmtiThreadState *state = jt->jvmti_thread_state();
3140 if (state != NULL) {
3141 KlassHandle *h_class_being_redefined =
3142 state->get_class_being_redefined();
3143 if (h_class_being_redefined != NULL) {
3144 instanceKlassHandle ikh_class_being_redefined =
3145 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3146 cached_class_file_bytes =
3147 ikh_class_being_redefined->get_cached_class_file_bytes();
3148 cached_class_file_length =
3149 ikh_class_being_redefined->get_cached_class_file_len();
3150 }
3151 }
3152
3153 unsigned char* ptr = cfs->buffer();
3154 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3155
3156 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3157 &ptr, &end_ptr,
3158 &cached_class_file_bytes,
3159 &cached_class_file_length);
3160
3161 if (ptr != cfs->buffer()) {
3162 // JVMTI agent has modified class file data.
3163 // Set new class file stream using JVMTI agent modified
3164 // class file data.
3165 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3166 set_stream(cfs);
3167 }
3168 }
3169
3170 _host_klass = host_klass;
3171 _cp_patches = cp_patches;
3172
3173 instanceKlassHandle nullHandle;
3174
3175 // Figure out whether we can skip format checking (matching classic VM behavior)
3176 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3177
3178 // Set the verify flag in stream
3179 cfs->set_verify(_need_verify);
3180
3181 // Save the class file name for easier error message printing.
3182 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3183
3184 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3185 // Magic value
3186 u4 magic = cfs->get_u4_fast();
3187 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3188 "Incompatible magic value %u in class file %s",
3189 magic, CHECK_(nullHandle));
3190
3191 // Version numbers
3192 u2 minor_version = cfs->get_u2_fast();
3193 u2 major_version = cfs->get_u2_fast();
3194
3195 // Check version numbers - we check this even with verifier off
3196 if (!is_supported_version(major_version, minor_version)) {
3197 if (name == NULL) {
3198 Exceptions::fthrow(
3199 THREAD_AND_LOCATION,
3200 vmSymbols::java_lang_UnsupportedClassVersionError(),
3201 "Unsupported major.minor version %u.%u",
3202 major_version,
3203 minor_version);
3204 } else {
3205 ResourceMark rm(THREAD);
3206 Exceptions::fthrow(
3207 THREAD_AND_LOCATION,
3208 vmSymbols::java_lang_UnsupportedClassVersionError(),
3209 "%s : Unsupported major.minor version %u.%u",
3210 name->as_C_string(),
3211 major_version,
3212 minor_version);
3213 }
3214 return nullHandle;
3215 }
3216
3217 _major_version = major_version;
3218 _minor_version = minor_version;
3219
3220
3221 // Check if verification needs to be relaxed for this class file
3222 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3223 _relax_verify = Verifier::relax_verify_for(class_loader());
3224
3225 // Constant pool
3226 constantPoolHandle cp = parse_constant_pool(loader_data, CHECK_(nullHandle));
3227 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
3228
3229 int cp_size = cp->length();
3230
3231 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3232
3233 // Access flags
3234 AccessFlags access_flags;
3235 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3236
3237 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3238 // Set abstract bit for old class files for backward compatibility
3239 flags |= JVM_ACC_ABSTRACT;
3240 }
3241 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3242 access_flags.set_flags(flags);
3243
3244 // This class and superclass
3245 instanceKlassHandle super_klass;
3246 u2 this_class_index = cfs->get_u2_fast();
3247 check_property(
3248 valid_cp_range(this_class_index, cp_size) &&
3249 cp->tag_at(this_class_index).is_unresolved_klass(),
3250 "Invalid this class index %u in constant pool in class file %s",
3251 this_class_index, CHECK_(nullHandle));
3252
3253 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3254 assert(class_name != NULL, "class_name can't be null");
3255
3256 // It's important to set parsed_name *before* resolving the super class.
3257 // (it's used for cleanup by the caller if parsing fails)
3258 parsed_name = class_name;
3259 // parsed_name is returned and can be used if there's an error, so add to
3260 // its reference count. Caller will decrement the refcount.
3261 parsed_name->increment_refcount();
3262
3263 // Update _class_name which could be null previously to be class_name
3264 _class_name = class_name;
3265
3266 // Don't need to check whether this class name is legal or not.
3267 // It has been checked when constant pool is parsed.
3268 // However, make sure it is not an array type.
3269 if (_need_verify) {
3270 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3271 "Bad class name in class file %s",
3272 CHECK_(nullHandle));
3273 }
3274
3275 Klass* preserve_this_klass; // for storing result across HandleMark
3276
3277 // release all handles when parsing is done
3278 { HandleMark hm(THREAD);
3279
3280 // Checks if name in class file matches requested name
3281 if (name != NULL && class_name != name) {
3282 ResourceMark rm(THREAD);
3283 Exceptions::fthrow(
3284 THREAD_AND_LOCATION,
3285 vmSymbols::java_lang_NoClassDefFoundError(),
3286 "%s (wrong name: %s)",
3287 name->as_C_string(),
3288 class_name->as_C_string()
3289 );
3290 return nullHandle;
3291 }
3292
3293 if (TraceClassLoadingPreorder) {
3294 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3295 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3296 tty->print_cr("]");
3297 }
3298
3299 u2 super_class_index = cfs->get_u2_fast();
3300 if (super_class_index == 0) {
3301 check_property(class_name == vmSymbols::java_lang_Object(),
3302 "Invalid superclass index %u in class file %s",
3303 super_class_index,
3304 CHECK_(nullHandle));
3305 } else {
3306 check_property(valid_cp_range(super_class_index, cp_size) &&
3307 is_klass_reference(cp, super_class_index),
3308 "Invalid superclass index %u in class file %s",
3309 super_class_index,
3310 CHECK_(nullHandle));
3311 // The class name should be legal because it is checked when parsing constant pool.
3312 // However, make sure it is not an array type.
3313 bool is_array = false;
3314 if (cp->tag_at(super_class_index).is_klass()) {
3315 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3316 if (_need_verify)
3317 is_array = super_klass->oop_is_array();
3318 } else if (_need_verify) {
3319 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3320 }
3321 if (_need_verify) {
3322 guarantee_property(!is_array,
3323 "Bad superclass name in class file %s", CHECK_(nullHandle));
3324 }
3325 }
3326
3327 // Interfaces
3328 u2 itfs_len = cfs->get_u2_fast();
3329 Array<Klass*>* local_interfaces;
3330 if (itfs_len == 0) {
3331 local_interfaces = Universe::the_empty_klass_array();
3332 } else {
3333 local_interfaces = parse_interfaces(
3334 cp, itfs_len, loader_data, protection_domain, _class_name,
3335 &has_default_methods, CHECK_(nullHandle));
3336 }
3337
3338 u2 java_fields_count = 0;
3339 // Fields (offsets are filled in later)
3340 FieldAllocationCount fac;
3341 Array<AnnotationArray*>* fields_annotations = NULL;
3342 Array<AnnotationArray*>* fields_type_annotations = NULL;
3343 Array<u2>* fields = parse_fields(loader_data, class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
3344 &fields_type_annotations,
3345 &java_fields_count,
3346 CHECK_(nullHandle));
3347 // Methods
3348 bool has_final_method = false;
3349 AccessFlags promoted_flags;
3350 promoted_flags.set_flags(0);
3351
3352 Array<AnnotationArray*>* methods_annotations = NULL;
3353 Array<AnnotationArray*>* methods_parameter_annotations = NULL;
3354 Array<AnnotationArray*>* methods_default_annotations = NULL;
3355 Array<AnnotationArray*>* methods_type_annotations = NULL;
3356 Array<Method*>* methods = parse_methods(loader_data,
3357 cp, access_flags.is_interface(),
3358 &promoted_flags,
3359 &has_final_method,
3360 &methods_annotations,
3361 &methods_parameter_annotations,
3362 &methods_default_annotations,
3363 &methods_type_annotations,
3364 &has_default_methods,
3365 CHECK_(nullHandle));
3366
3367 // Additional attributes
3368 ClassAnnotationCollector parsed_annotations;
3369 parse_classfile_attributes(loader_data, cp, &parsed_annotations, CHECK_(nullHandle));
3370
3371 // Make sure this is the end of class file stream
3372 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3373
3374 // We check super class after class file is parsed and format is checked
3375 if (super_class_index > 0 && super_klass.is_null()) {
3376 Symbol* sk = cp->klass_name_at(super_class_index);
3377 if (access_flags.is_interface()) {
3378 // Before attempting to resolve the superclass, check for class format
3379 // errors not checked yet.
3380 guarantee_property(sk == vmSymbols::java_lang_Object(),
3381 "Interfaces must have java.lang.Object as superclass in class file %s",
3382 CHECK_(nullHandle));
3383 }
3384 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3385 class_loader,
3386 protection_domain,
3387 true,
3388 CHECK_(nullHandle));
3389
3390 KlassHandle kh (THREAD, k);
3391 super_klass = instanceKlassHandle(THREAD, kh());
3392 }
3393 if (super_klass.not_null()) {
3394
3395 if (super_klass->has_default_methods()) {
3396 has_default_methods = true;
3397 }
3398
3399 if (super_klass->is_interface()) {
3400 ResourceMark rm(THREAD);
3401 Exceptions::fthrow(
3402 THREAD_AND_LOCATION,
3403 vmSymbols::java_lang_IncompatibleClassChangeError(),
3404 "class %s has interface %s as super class",
3405 class_name->as_klass_external_name(),
3406 super_klass->external_name()
3407 );
3408 return nullHandle;
3409 }
3410 // Make sure super class is not final
3411 if (super_klass->is_final()) {
3412 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3413 }
3414 }
3415
3416 // Compute the transitive list of all unique interfaces implemented by this class
3417 Array<Klass*>* transitive_interfaces = compute_transitive_interfaces(loader_data, super_klass, local_interfaces, CHECK_(nullHandle));
3418
3419 // sort methods
3420 Array<int>* method_ordering = sort_methods(loader_data,
3421 methods,
3422 methods_annotations,
3423 methods_parameter_annotations,
3424 methods_default_annotations,
3425 methods_type_annotations,
3426 CHECK_(nullHandle));
3427
3428 // promote flags from parse_methods() to the klass' flags
3429 access_flags.add_promoted_flags(promoted_flags.as_int());
3430
3431 // Size of Java vtable (in words)
3432 int vtable_size = 0;
3433 int itable_size = 0;
3434 int num_miranda_methods = 0;
3435
3436 GrowableArray<Method*> all_mirandas(20);
3437
3438 klassVtable::compute_vtable_size_and_num_mirandas(
3439 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3440 access_flags, class_loader, class_name, local_interfaces,
3441 CHECK_(nullHandle));
3442
3443 // Size of Java itable (in words)
3444 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3445
3446 // get the padding width from the option
3447 // TODO: Ask VM about specific CPU we are running on
3448 int pad_size = ContendedPaddingWidth;
3449
3450 // Field size and offset computation
3451 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3452 #ifndef PRODUCT
3453 int orig_nonstatic_field_size = 0;
3454 #endif
3455 int next_static_oop_offset;
3456 int next_static_double_offset;
3457 int next_static_word_offset;
3458 int next_static_short_offset;
3459 int next_static_byte_offset;
3460 int next_static_padded_offset;
3461 int next_nonstatic_oop_offset;
3462 int next_nonstatic_double_offset;
3463 int next_nonstatic_word_offset;
3464 int next_nonstatic_short_offset;
3465 int next_nonstatic_byte_offset;
3466 int next_nonstatic_type_offset;
3467 int first_nonstatic_oop_offset;
3468 int first_nonstatic_field_offset;
3469 int next_nonstatic_field_offset;
3470 int next_nonstatic_padded_offset;
3471
3472 // Count the contended fields by type.
3473 int static_contended_count = 0;
3474 int nonstatic_contended_count = 0;
3475 FieldAllocationCount fac_contended;
3476 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3477 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3478 if (fs.is_contended()) {
3479 fac_contended.count[atype]++;
3480 if (fs.access_flags().is_static()) {
3481 static_contended_count++;
3482 } else {
3483 nonstatic_contended_count++;
3484 }
3485 }
3486 }
3487 int contended_count = static_contended_count + nonstatic_contended_count;
3488
3489
3490 // Calculate the starting byte offsets
3491 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3492
3493 // class is contended, pad before all the fields
3494 if (parsed_annotations.is_contended()) {
3495 next_static_oop_offset += pad_size;
3496 }
3497
3498 next_static_double_offset = next_static_oop_offset +
3499 ((fac.count[STATIC_OOP] - fac_contended.count[STATIC_OOP]) * heapOopSize);
3500 if ( fac.count[STATIC_DOUBLE] &&
3501 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3502 Universe::field_type_should_be_aligned(T_LONG)) ) {
3503 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3504 }
3505
3506 next_static_word_offset = next_static_double_offset +
3507 ((fac.count[STATIC_DOUBLE] - fac_contended.count[STATIC_DOUBLE]) * BytesPerLong);
3508 next_static_short_offset = next_static_word_offset +
3509 ((fac.count[STATIC_WORD] - fac_contended.count[STATIC_WORD]) * BytesPerInt);
3510 next_static_byte_offset = next_static_short_offset +
3511 ((fac.count[STATIC_SHORT] - fac_contended.count[STATIC_SHORT]) * BytesPerShort);
3512 next_static_padded_offset = next_static_byte_offset +
3513 ((fac.count[STATIC_BYTE] - fac_contended.count[STATIC_BYTE]) * 1);
3514
3515 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3516 nonstatic_field_size * heapOopSize;
3517
3518 // class is contended, pad before all the fields
3519 if (parsed_annotations.is_contended()) {
3520 first_nonstatic_field_offset += pad_size;
3521 }
3522
3523 next_nonstatic_field_offset = first_nonstatic_field_offset;
3524
3525 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3526 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3527 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3528 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3529 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3530
3531 bool super_has_nonstatic_fields =
3532 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3533 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3534 ((nonstatic_double_count + nonstatic_word_count +
3535 nonstatic_short_count + nonstatic_byte_count +
3536 nonstatic_oop_count) != 0);
3537
3538
3539 // Prepare list of oops for oop map generation.
3540 int* nonstatic_oop_offsets;
3541 unsigned int* nonstatic_oop_counts;
3542 unsigned int nonstatic_oop_map_count = 0;
3543
3544 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3545 THREAD, int, nonstatic_oop_count + 1);
3546 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3547 THREAD, unsigned int, nonstatic_oop_count + 1);
3548
3549 first_nonstatic_oop_offset = 0; // will be set for first oop field
3550
3551 #ifndef PRODUCT
3552 if( PrintCompactFieldsSavings ) {
3553 next_nonstatic_double_offset = next_nonstatic_field_offset +
3554 (nonstatic_oop_count * heapOopSize);
3555 if ( nonstatic_double_count > 0 ) {
3556 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3557 }
3558 next_nonstatic_word_offset = next_nonstatic_double_offset +
3559 (nonstatic_double_count * BytesPerLong);
3560 next_nonstatic_short_offset = next_nonstatic_word_offset +
3561 (nonstatic_word_count * BytesPerInt);
3562 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3563 (nonstatic_short_count * BytesPerShort);
3564 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3565 nonstatic_byte_count ), heapOopSize );
3566 orig_nonstatic_field_size = nonstatic_field_size +
3567 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3568 }
3569 #endif
3570 bool compact_fields = CompactFields;
3571 int allocation_style = FieldsAllocationStyle;
3572 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3573 assert(false, "0 <= FieldsAllocationStyle <= 2");
3574 allocation_style = 1; // Optimistic
3575 }
3576
3577 // The next classes have predefined hard-coded fields offsets
3578 // (see in JavaClasses::compute_hard_coded_offsets()).
3579 // Use default fields allocation order for them.
3580 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3581 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3582 class_name == vmSymbols::java_lang_Class() ||
3583 class_name == vmSymbols::java_lang_ClassLoader() ||
3584 class_name == vmSymbols::java_lang_ref_Reference() ||
3585 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3586 class_name == vmSymbols::java_lang_StackTraceElement() ||
3587 class_name == vmSymbols::java_lang_String() ||
3588 class_name == vmSymbols::java_lang_Throwable() ||
3589 class_name == vmSymbols::java_lang_Boolean() ||
3590 class_name == vmSymbols::java_lang_Character() ||
3591 class_name == vmSymbols::java_lang_Float() ||
3592 class_name == vmSymbols::java_lang_Double() ||
3593 class_name == vmSymbols::java_lang_Byte() ||
3594 class_name == vmSymbols::java_lang_Short() ||
3595 class_name == vmSymbols::java_lang_Integer() ||
3596 class_name == vmSymbols::java_lang_Long())) {
3597 allocation_style = 0; // Allocate oops first
3598 compact_fields = false; // Don't compact fields
3599 }
3600
3601 if( allocation_style == 0 ) {
3602 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3603 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3604 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3605 (nonstatic_oop_count * heapOopSize);
3606 } else if( allocation_style == 1 ) {
3607 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3608 next_nonstatic_double_offset = next_nonstatic_field_offset;
3609 } else if( allocation_style == 2 ) {
3610 // Fields allocation: oops fields in super and sub classes are together.
3611 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3612 super_klass->nonstatic_oop_map_size() > 0 ) {
3613 int map_count = super_klass->nonstatic_oop_map_count();
3614 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3615 OopMapBlock* last_map = first_map + map_count - 1;
3616 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3617 if (next_offset == next_nonstatic_field_offset) {
3618 allocation_style = 0; // allocate oops first
3619 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3620 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3621 (nonstatic_oop_count * heapOopSize);
3622 }
3623 }
3624 if( allocation_style == 2 ) {
3625 allocation_style = 1; // allocate oops last
3626 next_nonstatic_double_offset = next_nonstatic_field_offset;
3627 }
3628 } else {
3629 ShouldNotReachHere();
3630 }
3631
3632 int nonstatic_oop_space_count = 0;
3633 int nonstatic_word_space_count = 0;
3634 int nonstatic_short_space_count = 0;
3635 int nonstatic_byte_space_count = 0;
3636 int nonstatic_oop_space_offset;
3637 int nonstatic_word_space_offset;
3638 int nonstatic_short_space_offset;
3639 int nonstatic_byte_space_offset;
3640
3641 if( nonstatic_double_count > 0 ) {
3642 int offset = next_nonstatic_double_offset;
3643 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3644 if( compact_fields && offset != next_nonstatic_double_offset ) {
3645 // Allocate available fields into the gap before double field.
3646 int length = next_nonstatic_double_offset - offset;
3647 assert(length == BytesPerInt, "");
3648 nonstatic_word_space_offset = offset;
3649 if( nonstatic_word_count > 0 ) {
3650 nonstatic_word_count -= 1;
3651 nonstatic_word_space_count = 1; // Only one will fit
3652 length -= BytesPerInt;
3653 offset += BytesPerInt;
3654 }
3655 nonstatic_short_space_offset = offset;
3656 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3657 nonstatic_short_count -= 1;
3658 nonstatic_short_space_count += 1;
3659 length -= BytesPerShort;
3660 offset += BytesPerShort;
3661 }
3662 nonstatic_byte_space_offset = offset;
3663 while( length > 0 && nonstatic_byte_count > 0 ) {
3664 nonstatic_byte_count -= 1;
3665 nonstatic_byte_space_count += 1;
3666 length -= 1;
3667 }
3668 // Allocate oop field in the gap if there are no other fields for that.
3669 nonstatic_oop_space_offset = offset;
3670 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3671 allocation_style != 0 ) { // when oop fields not first
3672 nonstatic_oop_count -= 1;
3673 nonstatic_oop_space_count = 1; // Only one will fit
3674 length -= heapOopSize;
3675 offset += heapOopSize;
3676 }
3677 }
3678 }
3679
3680 next_nonstatic_word_offset = next_nonstatic_double_offset +
3681 (nonstatic_double_count * BytesPerLong);
3682 next_nonstatic_short_offset = next_nonstatic_word_offset +
3683 (nonstatic_word_count * BytesPerInt);
3684 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3685 (nonstatic_short_count * BytesPerShort);
3686 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3687 nonstatic_byte_count;
3688
3689 // let oops jump before padding with this allocation style
3690 if( allocation_style == 1 ) {
3691 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3692 if( nonstatic_oop_count > 0 ) {
3693 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3694 }
3695 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3696 }
3697
3698 // Iterate over fields again and compute correct offsets.
3699 // The field allocation type was temporarily stored in the offset slot.
3700 // oop fields are located before non-oop fields (static and non-static).
3701 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3702
3703 // skip already laid out fields
3704 if (fs.is_offset_set()) continue;
3705
3706 // contended fields are handled below
3707 if (fs.is_contended()) continue;
3708
3709 int real_offset;
3710 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3711
3712 // pack the rest of the fields
3713 switch (atype) {
3714 case STATIC_OOP:
3715 real_offset = next_static_oop_offset;
3716 next_static_oop_offset += heapOopSize;
3717 break;
3718 case STATIC_BYTE:
3719 real_offset = next_static_byte_offset;
3720 next_static_byte_offset += 1;
3721 break;
3722 case STATIC_SHORT:
3723 real_offset = next_static_short_offset;
3724 next_static_short_offset += BytesPerShort;
3725 break;
3726 case STATIC_WORD:
3727 real_offset = next_static_word_offset;
3728 next_static_word_offset += BytesPerInt;
3729 break;
3730 case STATIC_DOUBLE:
3731 real_offset = next_static_double_offset;
3732 next_static_double_offset += BytesPerLong;
3733 break;
3734 case NONSTATIC_OOP:
3735 if( nonstatic_oop_space_count > 0 ) {
3736 real_offset = nonstatic_oop_space_offset;
3737 nonstatic_oop_space_offset += heapOopSize;
3738 nonstatic_oop_space_count -= 1;
3739 } else {
3740 real_offset = next_nonstatic_oop_offset;
3741 next_nonstatic_oop_offset += heapOopSize;
3742 }
3743 // Update oop maps
3744 if( nonstatic_oop_map_count > 0 &&
3745 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3746 real_offset -
3747 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3748 heapOopSize ) {
3749 // Extend current oop map
3750 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3751 } else {
3752 // Create new oop map
3753 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3754 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3755 nonstatic_oop_map_count += 1;
3756 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3757 first_nonstatic_oop_offset = real_offset;
3758 }
3759 }
3760 break;
3761 case NONSTATIC_BYTE:
3762 if( nonstatic_byte_space_count > 0 ) {
3763 real_offset = nonstatic_byte_space_offset;
3764 nonstatic_byte_space_offset += 1;
3765 nonstatic_byte_space_count -= 1;
3766 } else {
3767 real_offset = next_nonstatic_byte_offset;
3768 next_nonstatic_byte_offset += 1;
3769 }
3770 break;
3771 case NONSTATIC_SHORT:
3772 if( nonstatic_short_space_count > 0 ) {
3773 real_offset = nonstatic_short_space_offset;
3774 nonstatic_short_space_offset += BytesPerShort;
3775 nonstatic_short_space_count -= 1;
3776 } else {
3777 real_offset = next_nonstatic_short_offset;
3778 next_nonstatic_short_offset += BytesPerShort;
3779 }
3780 break;
3781 case NONSTATIC_WORD:
3782 if( nonstatic_word_space_count > 0 ) {
3783 real_offset = nonstatic_word_space_offset;
3784 nonstatic_word_space_offset += BytesPerInt;
3785 nonstatic_word_space_count -= 1;
3786 } else {
3787 real_offset = next_nonstatic_word_offset;
3788 next_nonstatic_word_offset += BytesPerInt;
3789 }
3790 break;
3791 case NONSTATIC_DOUBLE:
3792 real_offset = next_nonstatic_double_offset;
3793 next_nonstatic_double_offset += BytesPerLong;
3794 break;
3795 default:
3796 ShouldNotReachHere();
3797 }
3798 fs.set_offset(real_offset);
3799 }
3800
3801
3802 // Handle the contended cases.
3803 //
3804 // Each contended field should not intersect the cache line with another contended field.
3805 // In the absence of alignment information, we end up with pessimistically separating
3806 // the fields with full-width padding.
3807 //
3808 // Additionally, this should not break alignment for the fields, so we round the alignment up
3809 // for each field.
3810 if (contended_count > 0) {
3811
3812 // if there is at least one contended field, we need to have pre-padding for them
3813 if (nonstatic_contended_count > 0) {
3814 next_nonstatic_padded_offset += pad_size;
3815 }
3816
3817 // collect all contended groups
3818 BitMap bm(cp->size());
3819 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3820 // skip already laid out fields
3821 if (fs.is_offset_set()) continue;
3822
3823 if (fs.is_contended()) {
3824 bm.set_bit(fs.contended_group());
3825 }
3826 }
3827
3828 int current_group = -1;
3829 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3830
3831 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3832
3833 // skip already laid out fields
3834 if (fs.is_offset_set()) continue;
3835
3836 // skip non-contended fields and fields from different group
3837 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3838
3839 // handle statics below
3840 if (fs.access_flags().is_static()) continue;
3841
3842 int real_offset;
3843 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3844
3845 switch (atype) {
3846 case NONSTATIC_BYTE:
3847 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3848 real_offset = next_nonstatic_padded_offset;
3849 next_nonstatic_padded_offset += 1;
3850 break;
3851
3852 case NONSTATIC_SHORT:
3853 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3854 real_offset = next_nonstatic_padded_offset;
3855 next_nonstatic_padded_offset += BytesPerShort;
3856 break;
3857
3858 case NONSTATIC_WORD:
3859 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3860 real_offset = next_nonstatic_padded_offset;
3861 next_nonstatic_padded_offset += BytesPerInt;
3862 break;
3863
3864 case NONSTATIC_DOUBLE:
3865 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3866 real_offset = next_nonstatic_padded_offset;
3867 next_nonstatic_padded_offset += BytesPerLong;
3868 break;
3869
3870 case NONSTATIC_OOP:
3871 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3872 real_offset = next_nonstatic_padded_offset;
3873 next_nonstatic_padded_offset += heapOopSize;
3874
3875 // Create new oop map
3876 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3877 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3878 nonstatic_oop_map_count += 1;
3879 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3880 first_nonstatic_oop_offset = real_offset;
3881 }
3882 break;
3883
3884 default:
3885 ShouldNotReachHere();
3886 }
3887
3888 if (fs.contended_group() == 0) {
3889 // Contended group defines the equivalence class over the fields:
3890 // the fields within the same contended group are not inter-padded.
3891 // The only exception is default group, which does not incur the
3892 // equivalence, and so requires intra-padding.
3893 next_nonstatic_padded_offset += pad_size;
3894 }
3895
3896 fs.set_offset(real_offset);
3897 } // for
3898
3899 // Start laying out the next group.
3900 // Note that this will effectively pad the last group in the back;
3901 // this is expected to alleviate memory contention effects for
3902 // subclass fields and/or adjacent object.
3903 // If this was the default group, the padding is already in place.
3904 if (current_group != 0) {
3905 next_nonstatic_padded_offset += pad_size;
3906 }
3907 }
3908
3909 // handle static fields
3910
3911 // if there is at least one contended field, we need to have pre-padding for them
3912 if (static_contended_count > 0) {
3913 next_static_padded_offset += pad_size;
3914 }
3915
3916 current_group = -1;
3917 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3918
3919 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3920
3921 // skip already laid out fields
3922 if (fs.is_offset_set()) continue;
3923
3924 // skip non-contended fields and fields from different group
3925 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3926
3927 // non-statics already handled above
3928 if (!fs.access_flags().is_static()) continue;
3929
3930 int real_offset;
3931 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3932
3933 switch (atype) {
3934
3935 case STATIC_BYTE:
3936 next_static_padded_offset = align_size_up(next_static_padded_offset, 1);
3937 real_offset = next_static_padded_offset;
3938 next_static_padded_offset += 1;
3939 break;
3940
3941 case STATIC_SHORT:
3942 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerShort);
3943 real_offset = next_static_padded_offset;
3944 next_static_padded_offset += BytesPerShort;
3945 break;
3946
3947 case STATIC_WORD:
3948 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerInt);
3949 real_offset = next_static_padded_offset;
3950 next_static_padded_offset += BytesPerInt;
3951 break;
3952
3953 case STATIC_DOUBLE:
3954 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerLong);
3955 real_offset = next_static_padded_offset;
3956 next_static_padded_offset += BytesPerLong;
3957 break;
3958
3959 case STATIC_OOP:
3960 next_static_padded_offset = align_size_up(next_static_padded_offset, heapOopSize);
3961 real_offset = next_static_padded_offset;
3962 next_static_padded_offset += heapOopSize;
3963 break;
3964
3965 default:
3966 ShouldNotReachHere();
3967 }
3968
3969 if (fs.contended_group() == 0) {
3970 // Contended group defines the equivalence class over the fields:
3971 // the fields within the same contended group are not inter-padded.
3972 // The only exception is default group, which does not incur the
3973 // equivalence, and so requires intra-padding.
3974 next_static_padded_offset += pad_size;
3975 }
3976
3977 fs.set_offset(real_offset);
3978 } // for
3979
3980 // Start laying out the next group.
3981 // Note that this will effectively pad the last group in the back;
3982 // this is expected to alleviate memory contention effects for
3983 // subclass fields and/or adjacent object.
3984 // If this was the default group, the padding is already in place.
3985 if (current_group != 0) {
3986 next_static_padded_offset += pad_size;
3987 }
3988
3989 }
3990
3991 } // handle contended
3992
3993 // Size of instances
3994 int instance_size;
3995
3996 int notaligned_offset = next_nonstatic_padded_offset;
3997
3998 // Entire class is contended, pad in the back.
3999 // This helps to alleviate memory contention effects for subclass fields
4000 // and/or adjacent object.
4001 if (parsed_annotations.is_contended()) {
4002 notaligned_offset += pad_size;
4003 next_static_padded_offset += pad_size;
4004 }
4005
4006 int next_static_type_offset = align_size_up(next_static_padded_offset, wordSize);
4007 int static_field_size = (next_static_type_offset -
4008 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4009
4010 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
4011 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
4012 - first_nonstatic_field_offset)/heapOopSize);
4013
4014 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
4015 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
4016
4017 assert(instance_size == align_object_size(align_size_up(
4018 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations.is_contended()) ? pad_size : 0)),
4019 wordSize) / wordSize), "consistent layout helper value");
4020
4021 // Number of non-static oop map blocks allocated at end of klass.
4022 const unsigned int total_oop_map_count =
4023 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
4024 first_nonstatic_oop_offset);
4025
4026 // Compute reference type
4027 ReferenceType rt;
4028 if (super_klass() == NULL) {
4029 rt = REF_NONE;
4030 } else {
4031 rt = super_klass->reference_type();
4032 }
4033
4034 // We can now create the basic Klass* for this klass
4035 int total_oop_map_size2 =
4036 InstanceKlass::nonstatic_oop_map_size(total_oop_map_count);
4037
4038 Klass* ik = InstanceKlass::allocate_instance_klass(loader_data,
4039 vtable_size,
4040 itable_size,
4041 static_field_size,
4042 total_oop_map_size2,
4043 rt,
4044 access_flags,
4045 name,
4046 super_klass(),
4047 host_klass,
4048 CHECK_(nullHandle));
4049
4050 // Add all classes to our internal class loader list here,
4051 // including classes in the bootstrap (NULL) class loader.
4052 loader_data->add_class(ik);
4053
4054 instanceKlassHandle this_klass (THREAD, ik);
4055
4056 assert(this_klass->static_field_size() == static_field_size, "sanity");
4057 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
4058 "sanity");
4059
4060 // Fill in information already parsed
4061 this_klass->set_should_verify_class(verify);
4062 jint lh = Klass::instance_layout_helper(instance_size, false);
4063 this_klass->set_layout_helper(lh);
4064 assert(this_klass->oop_is_instance(), "layout is correct");
4065 assert(this_klass->size_helper() == instance_size, "correct size_helper");
4066 // Not yet: supers are done below to support the new subtype-checking fields
4067 //this_klass->set_super(super_klass());
4068 this_klass->set_class_loader_data(loader_data);
4069 this_klass->set_nonstatic_field_size(nonstatic_field_size);
4070 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
4071 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4072 cp->set_pool_holder(this_klass());
4073 error_handler.set_in_error(false); // turn off error handler for cp
4074 this_klass->set_constants(cp());
4075 this_klass->set_local_interfaces(local_interfaces);
4076 this_klass->set_fields(fields, java_fields_count);
4077 this_klass->set_methods(methods);
4078 if (has_final_method) {
4079 this_klass->set_has_final_method();
4080 }
4081 this_klass->set_method_ordering(method_ordering);
4082 // The InstanceKlass::_methods_jmethod_ids cache and the
4083 // InstanceKlass::_methods_cached_itable_indices cache are
4084 // both managed on the assumption that the initial cache
4085 // size is equal to the number of methods in the class. If
4086 // that changes, then InstanceKlass::idnum_can_increment()
4087 // has to be changed accordingly.
4088 this_klass->set_initial_method_idnum(methods->length());
4089 this_klass->set_name(cp->klass_name_at(this_class_index));
4090 if (is_anonymous()) // I am well known to myself
4091 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4092
4093 // Allocate an annotation type if needed.
4094 if (fields_annotations != NULL ||
4095 methods_annotations != NULL ||
4096 methods_parameter_annotations != NULL ||
4097 methods_default_annotations != NULL ||
4098 fields_type_annotations != NULL ||
4099 methods_type_annotations != NULL) {
4100 Annotations* anno = Annotations::allocate(loader_data,
4101 fields_annotations, methods_annotations,
4102 methods_parameter_annotations,
4103 methods_default_annotations, CHECK_(nullHandle));
4104 this_klass->set_annotations(anno);
4105 } else {
4106 this_klass->set_annotations(NULL);
4107 }
4108
4109 if (fields_type_annotations != NULL ||
4110 methods_type_annotations != NULL) {
4111 assert(this_klass->annotations() != NULL, "annotations should have been allocated");
4112 Annotations* anno = Annotations::allocate(loader_data,
4113 fields_type_annotations,
4114 methods_type_annotations,
4115 NULL,
4116 NULL, CHECK_(nullHandle));
4117 this_klass->annotations()->set_type_annotations(anno);
4118 }
4119
4120 this_klass->set_minor_version(minor_version);
4121 this_klass->set_major_version(major_version);
4122 this_klass->set_has_default_methods(has_default_methods);
4123
4124 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4125 // (We used to do this lazily, but now we query it in Rewriter,
4126 // which is eagerly done for every method, so we might as well do it now,
4127 // when everything is fresh in memory.)
4128 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4129 for (int j = 0; j < methods->length(); j++) {
4130 methods->at(j)->init_intrinsic_id();
4131 }
4132 }
4133
4134 if (cached_class_file_bytes != NULL) {
4135 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4136 this_klass->set_cached_class_file(cached_class_file_bytes,
4137 cached_class_file_length);
4138 }
4139
4140 // Fill in field values obtained by parse_classfile_attributes
4141 if (parsed_annotations.has_any_annotations())
4142 parsed_annotations.apply_to(this_klass);
4143
4144 // Create annotations
4145 if (_annotations != NULL && this_klass->annotations() == NULL) {
4146 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4147 this_klass->set_annotations(anno);
4148 }
4149 apply_parsed_class_attributes(this_klass);
4150
4151 // Create type annotations
4152 if (_type_annotations != NULL) {
4153 if (this_klass->annotations() == NULL) {
4154 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4155 this_klass->set_annotations(anno);
4156 }
4157 if (this_klass->annotations()->type_annotations() == NULL) {
4158 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4159 this_klass->annotations()->set_type_annotations(anno);
4160 }
4161 this_klass->annotations()->type_annotations()->set_class_annotations(_type_annotations);
4162 }
4163
4164 // Miranda methods
4165 if ((num_miranda_methods > 0) ||
4166 // if this class introduced new miranda methods or
4167 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4168 // super class exists and this class inherited miranda methods
4169 ) {
4170 this_klass->set_has_miranda_methods(); // then set a flag
4171 }
4172
4173 this_klass->set_transitive_interfaces(transitive_interfaces);
4174
4175 // Fill in information needed to compute superclasses.
4176 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4177
4178 // Initialize itable offset tables
4179 klassItable::setup_itable_offset_table(this_klass);
4180
4181 // Compute transitive closure of interfaces this class implements
4182 // Do final class setup
4183 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
4184
4185 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4186 set_precomputed_flags(this_klass);
4187
4188 // reinitialize modifiers, using the InnerClasses attribute
4189 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4190 this_klass->set_modifier_flags(computed_modifiers);
4191
4192 // check if this class can access its super class
4193 check_super_class_access(this_klass, CHECK_(nullHandle));
4194
4195 // check if this class can access its superinterfaces
4196 check_super_interface_access(this_klass, CHECK_(nullHandle));
4197
4198 // check if this class overrides any final method
4199 check_final_method_override(this_klass, CHECK_(nullHandle));
4200
4201 // check that if this class is an interface then it doesn't have static methods
4202 if (this_klass->is_interface()) {
4203 /* An interface in a JAVA 8 classfile can be static */
4204 if (_major_version < JAVA_8_VERSION) {
4205 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4206 }
4207 }
4208
4209
4210 #ifdef ASSERT
4211 if (ParseAllGenericSignatures) {
4212 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4213 }
4214 #endif
4215
4216 // Generate any default methods - default methods are interface methods
4217 // that have a default implementation. This is new with Lambda project.
4218 if (has_default_methods && !access_flags.is_interface() &&
4219 local_interfaces->length() > 0) {
4220 DefaultMethods::generate_default_methods(
4221 this_klass(), &all_mirandas, CHECK_(nullHandle));
4222 }
4223
4224 // Allocate mirror and initialize static fields
4225 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
4226
4227 // Allocate a simple java object for locking during class initialization.
4228 // This needs to be a java object because it can be held across a java call.
4229 typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
4230 this_klass->set_init_lock(r);
4231
4232 // TODO: Move these oops to the mirror
4233 this_klass->set_protection_domain(protection_domain());
4234
4235 // Update the loader_data graph.
4236 record_defined_class_dependencies(this_klass, CHECK_NULL);
4237
4238 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4239 false /* not shared class */);
4240
4241 if (TraceClassLoading) {
4242 ResourceMark rm;
4243 // print in a single call to reduce interleaving of output
4244 if (cfs->source() != NULL) {
4245 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4246 cfs->source());
4247 } else if (class_loader.is_null()) {
4248 if (THREAD->is_Java_thread()) {
4249 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4250 tty->print("[Loaded %s by instance of %s]\n",
4251 this_klass->external_name(),
4252 InstanceKlass::cast(caller)->external_name());
4253 } else {
4254 tty->print("[Loaded %s]\n", this_klass->external_name());
4255 }
4256 } else {
4257 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4258 InstanceKlass::cast(class_loader->klass())->external_name());
4259 }
4260 }
4261
4262 if (TraceClassResolution) {
4263 ResourceMark rm;
4264 // print out the superclass.
4265 const char * from = this_klass()->external_name();
4266 if (this_klass->java_super() != NULL) {
4267 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4268 }
4269 // print out each of the interface classes referred to by this class.
4270 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4271 if (local_interfaces != NULL) {
4272 int length = local_interfaces->length();
4273 for (int i = 0; i < length; i++) {
4274 Klass* k = local_interfaces->at(i);
4275 InstanceKlass* to_class = InstanceKlass::cast(k);
4276 const char * to = to_class->external_name();
4277 tty->print("RESOLVE %s %s (interface)\n", from, to);
4278 }
4279 }
4280 }
4281
4282 #ifndef PRODUCT
4283 if( PrintCompactFieldsSavings ) {
4284 ResourceMark rm;
4285 if( nonstatic_field_size < orig_nonstatic_field_size ) {
4286 tty->print("[Saved %d of %d bytes in %s]\n",
4287 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
4288 orig_nonstatic_field_size*heapOopSize,
4289 this_klass->external_name());
4290 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
4291 tty->print("[Wasted %d over %d bytes in %s]\n",
4292 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
4293 orig_nonstatic_field_size*heapOopSize,
4294 this_klass->external_name());
4295 }
4296 }
4297 #endif
4298
4299 #ifndef PRODUCT
4300 if (PrintFieldLayout) {
4301 print_field_layout(name,
4302 fields,
4303 cp,
4304 instance_size,
4305 first_nonstatic_field_offset,
4306 next_nonstatic_field_offset,
4307 next_static_type_offset);
4308 }
4309 #endif
4310
4311 // preserve result across HandleMark
4312 preserve_this_klass = this_klass();
4313 }
4314
4315 // Create new handle outside HandleMark (might be needed for
4316 // Extended Class Redefinition)
4317 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4318 debug_only(this_klass->verify();)
4319
4320 return this_klass;
4321 }
4322
4323 void ClassFileParser::print_field_layout(Symbol* name,
4324 Array<u2>* fields,
4325 constantPoolHandle cp,
4326 int instance_size,
4327 int instance_fields_start,
4328 int instance_fields_end,
4329 int static_fields_end) {
4330 tty->print("%s: field layout\n", name->as_klass_external_name());
4331 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4332 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4333 if (!fs.access_flags().is_static()) {
4334 tty->print(" @%3d \"%s\" %s\n",
4335 fs.offset(),
4336 fs.name()->as_klass_external_name(),
4337 fs.signature()->as_klass_external_name());
4338 }
4339 }
4340 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4341 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4342 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4343 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4344 if (fs.access_flags().is_static()) {
4345 tty->print(" @%3d \"%s\" %s\n",
4346 fs.offset(),
4347 fs.name()->as_klass_external_name(),
4348 fs.signature()->as_klass_external_name());
4349 }
4350 }
4351 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4352 tty->print("\n");
4353 }
4354
4355 unsigned int
4356 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4357 unsigned int nonstatic_oop_map_count,
4358 int first_nonstatic_oop_offset) {
4359 unsigned int map_count =
4360 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4361 if (nonstatic_oop_map_count > 0) {
4362 // We have oops to add to map
4363 if (map_count == 0) {
4364 map_count = nonstatic_oop_map_count;
4365 } else {
4366 // Check whether we should add a new map block or whether the last one can
4367 // be extended
4368 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4369 OopMapBlock* const last_map = first_map + map_count - 1;
4370
4371 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4372 if (next_offset == first_nonstatic_oop_offset) {
4373 // There is no gap bettwen superklass's last oop field and first
4374 // local oop field, merge maps.
4375 nonstatic_oop_map_count -= 1;
4376 } else {
4377 // Superklass didn't end with a oop field, add extra maps
4378 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4379 }
4380 map_count += nonstatic_oop_map_count;
4381 }
4382 }
4383 return map_count;
4384 }
4385
4386
4387 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4388 unsigned int nonstatic_oop_map_count,
4389 int* nonstatic_oop_offsets,
4390 unsigned int* nonstatic_oop_counts) {
4391 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4392 const InstanceKlass* const super = k->superklass();
4393 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4394 if (super_count > 0) {
4395 // Copy maps from superklass
4396 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4397 for (unsigned int i = 0; i < super_count; ++i) {
4398 *this_oop_map++ = *super_oop_map++;
4399 }
4400 }
4401
4402 if (nonstatic_oop_map_count > 0) {
4403 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4404 // The counts differ because there is no gap between superklass's last oop
4405 // field and the first local oop field. Extend the last oop map copied
4406 // from the superklass instead of creating new one.
4407 nonstatic_oop_map_count--;
4408 nonstatic_oop_offsets++;
4409 this_oop_map--;
4410 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4411 this_oop_map++;
4412 }
4413
4414 // Add new map blocks, fill them
4415 while (nonstatic_oop_map_count-- > 0) {
4416 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4417 this_oop_map->set_count(*nonstatic_oop_counts++);
4418 this_oop_map++;
4419 }
4420 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4421 this_oop_map, "sanity");
4422 }
4423 }
4424
4425
4426 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4427 Klass* super = k->super();
4428
4429 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4430 // in which case we don't have to register objects as finalizable
4431 if (!_has_empty_finalizer) {
4432 if (_has_finalizer ||
4433 (super != NULL && super->has_finalizer())) {
4434 k->set_has_finalizer();
4435 }
4436 }
4437
4438 #ifdef ASSERT
4439 bool f = false;
4440 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4441 vmSymbols::void_method_signature());
4442 if (m != NULL && !m->is_empty_method()) {
4443 f = true;
4444 }
4445 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4446 #endif
4447
4448 // Check if this klass supports the java.lang.Cloneable interface
4449 if (SystemDictionary::Cloneable_klass_loaded()) {
4450 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4451 k->set_is_cloneable();
4452 }
4453 }
4454
4455 // Check if this klass has a vanilla default constructor
4456 if (super == NULL) {
4457 // java.lang.Object has empty default constructor
4458 k->set_has_vanilla_constructor();
4459 } else {
4460 if (super->has_vanilla_constructor() &&
4461 _has_vanilla_constructor) {
4462 k->set_has_vanilla_constructor();
4463 }
4464 #ifdef ASSERT
4465 bool v = false;
4466 if (super->has_vanilla_constructor()) {
4467 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4468 ), vmSymbols::void_method_signature());
4469 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4470 v = true;
4471 }
4472 }
4473 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4474 #endif
4475 }
4476
4477 // If it cannot be fast-path allocated, set a bit in the layout helper.
4478 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4479 assert(k->size_helper() > 0, "layout_helper is initialized");
4480 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4481 || k->is_abstract() || k->is_interface()
4482 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4483 || k->size_helper() >= FastAllocateSizeLimit) {
4484 // Forbid fast-path allocation.
4485 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4486 k->set_layout_helper(lh);
4487 }
4488 }
4489
4490 // Attach super classes and interface classes to class loader data
4491 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4492 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4493 if (defining_loader_data->is_the_null_class_loader_data()) {
4494 // Dependencies to null class loader data are implicit.
4495 return;
4496 } else {
4497 // add super class dependency
4498 Klass* super = defined_klass->super();
4499 if (super != NULL) {
4500 defining_loader_data->record_dependency(super, CHECK);
4501 }
4502
4503 // add super interface dependencies
4504 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4505 if (local_interfaces != NULL) {
4506 int length = local_interfaces->length();
4507 for (int i = 0; i < length; i++) {
4508 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4509 }
4510 }
4511 }
4512 }
4513
4514 // utility method for appending and array with check for duplicates
4515
4516 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4517 // iterate over new interfaces
4518 for (int i = 0; i < ifs->length(); i++) {
4519 Klass* e = ifs->at(i);
4520 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4521 // add new interface
4522 result->append_if_missing(e);
4523 }
4524 }
4525
4526
4527 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(ClassLoaderData* loader_data, instanceKlassHandle super, Array<Klass*>* local_ifs, TRAPS) {
4528 // Compute maximum size for transitive interfaces
4529 int max_transitive_size = 0;
4530 int super_size = 0;
4531 // Add superclass transitive interfaces size
4532 if (super.not_null()) {
4533 super_size = super->transitive_interfaces()->length();
4534 max_transitive_size += super_size;
4535 }
4536 // Add local interfaces' super interfaces
4537 int local_size = local_ifs->length();
4538 for (int i = 0; i < local_size; i++) {
4539 Klass* l = local_ifs->at(i);
4540 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4541 }
4542 // Finally add local interfaces
4543 max_transitive_size += local_size;
4544 // Construct array
4545 if (max_transitive_size == 0) {
4546 // no interfaces, use canonicalized array
4547 return Universe::the_empty_klass_array();
4548 } else if (max_transitive_size == super_size) {
4549 // no new local interfaces added, share superklass' transitive interface array
4550 return super->transitive_interfaces();
4551 } else if (max_transitive_size == local_size) {
4552 // only local interfaces added, share local interface array
4553 return local_ifs;
4554 } else {
4555 ResourceMark rm;
4556 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4557
4558 // Copy down from superclass
4559 if (super.not_null()) {
4560 append_interfaces(result, super->transitive_interfaces());
4561 }
4562
4563 // Copy down from local interfaces' superinterfaces
4564 for (int i = 0; i < local_ifs->length(); i++) {
4565 Klass* l = local_ifs->at(i);
4566 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4567 }
4568 // Finally add local interfaces
4569 append_interfaces(result, local_ifs);
4570
4571 // length will be less than the max_transitive_size if duplicates were removed
4572 int length = result->length();
4573 assert(length <= max_transitive_size, "just checking");
4574 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4575 for (int i = 0; i < length; i++) {
4576 Klass* e = result->at(i);
4577 assert(e != NULL, "just checking");
4578 new_result->at_put(i, e);
4579 }
4580 return new_result;
4581 }
4582 }
4583
4584
4585 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4586 Klass* super = this_klass->super();
4587 if ((super != NULL) &&
4588 (!Reflection::verify_class_access(this_klass(), super, false))) {
4589 ResourceMark rm(THREAD);
4590 Exceptions::fthrow(
4591 THREAD_AND_LOCATION,
4592 vmSymbols::java_lang_IllegalAccessError(),
4593 "class %s cannot access its superclass %s",
4594 this_klass->external_name(),
4595 InstanceKlass::cast(super)->external_name()
4596 );
4597 return;
4598 }
4599 }
4600
4601
4602 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4603 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4604 int lng = local_interfaces->length();
4605 for (int i = lng - 1; i >= 0; i--) {
4606 Klass* k = local_interfaces->at(i);
4607 assert (k != NULL && k->is_interface(), "invalid interface");
4608 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4609 ResourceMark rm(THREAD);
4610 Exceptions::fthrow(
4611 THREAD_AND_LOCATION,
4612 vmSymbols::java_lang_IllegalAccessError(),
4613 "class %s cannot access its superinterface %s",
4614 this_klass->external_name(),
4615 InstanceKlass::cast(k)->external_name()
4616 );
4617 return;
4618 }
4619 }
4620 }
4621
4622
4623 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4624 Array<Method*>* methods = this_klass->methods();
4625 int num_methods = methods->length();
4626
4627 // go thru each method and check if it overrides a final method
4628 for (int index = 0; index < num_methods; index++) {
4629 Method* m = methods->at(index);
4630
4631 // skip private, static and <init> methods
4632 if ((!m->is_private()) &&
4633 (!m->is_static()) &&
4634 (m->name() != vmSymbols::object_initializer_name())) {
4635
4636 Symbol* name = m->name();
4637 Symbol* signature = m->signature();
4638 Klass* k = this_klass->super();
4639 Method* super_m = NULL;
4640 while (k != NULL) {
4641 // skip supers that don't have final methods.
4642 if (k->has_final_method()) {
4643 // lookup a matching method in the super class hierarchy
4644 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4645 if (super_m == NULL) {
4646 break; // didn't find any match; get out
4647 }
4648
4649 if (super_m->is_final() &&
4650 // matching method in super is final
4651 (Reflection::verify_field_access(this_klass(),
4652 super_m->method_holder(),
4653 super_m->method_holder(),
4654 super_m->access_flags(), false))
4655 // this class can access super final method and therefore override
4656 ) {
4657 ResourceMark rm(THREAD);
4658 Exceptions::fthrow(
4659 THREAD_AND_LOCATION,
4660 vmSymbols::java_lang_VerifyError(),
4661 "class %s overrides final method %s.%s",
4662 this_klass->external_name(),
4663 name->as_C_string(),
4664 signature->as_C_string()
4665 );
4666 return;
4667 }
4668
4669 // continue to look from super_m's holder's super.
4670 k = super_m->method_holder()->super();
4671 continue;
4672 }
4673
4674 k = k->super();
4675 }
4676 }
4677 }
4678 }
4679
4680
4681 // assumes that this_klass is an interface
4682 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4683 assert(this_klass->is_interface(), "not an interface");
4684 Array<Method*>* methods = this_klass->methods();
4685 int num_methods = methods->length();
4686
4687 for (int index = 0; index < num_methods; index++) {
4688 Method* m = methods->at(index);
4689 // if m is static and not the init method, throw a verify error
4690 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4691 ResourceMark rm(THREAD);
4692 Exceptions::fthrow(
4693 THREAD_AND_LOCATION,
4694 vmSymbols::java_lang_VerifyError(),
4695 "Illegal static method %s in interface %s",
4696 m->name()->as_C_string(),
4697 this_klass->external_name()
4698 );
4699 return;
4700 }
4701 }
4702 }
4703
4704 // utility methods for format checking
4705
4706 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4707 if (!_need_verify) { return; }
4708
4709 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4710 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4711 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4712 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4713 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4714 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4715 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4716
4717 if ((is_abstract && is_final) ||
4718 (is_interface && !is_abstract) ||
4719 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4720 (!is_interface && major_gte_15 && is_annotation)) {
4721 ResourceMark rm(THREAD);
4722 Exceptions::fthrow(
4723 THREAD_AND_LOCATION,
4724 vmSymbols::java_lang_ClassFormatError(),
4725 "Illegal class modifiers in class %s: 0x%X",
4726 _class_name->as_C_string(), flags
4727 );
4728 return;
4729 }
4730 }
4731
4732 bool ClassFileParser::has_illegal_visibility(jint flags) {
4733 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4734 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4735 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4736
4737 return ((is_public && is_protected) ||
4738 (is_public && is_private) ||
4739 (is_protected && is_private));
4740 }
4741
4742 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4743 u2 max_version =
4744 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4745 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4746 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4747 (major <= max_version) &&
4748 ((major != max_version) ||
4749 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4750 }
4751
4752 void ClassFileParser::verify_legal_field_modifiers(
4753 jint flags, bool is_interface, TRAPS) {
4754 if (!_need_verify) { return; }
4755
4756 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4757 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4758 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4759 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4760 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4761 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4762 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4763 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4764 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4765
4766 bool is_illegal = false;
4767
4768 if (is_interface) {
4769 if (!is_public || !is_static || !is_final || is_private ||
4770 is_protected || is_volatile || is_transient ||
4771 (major_gte_15 && is_enum)) {
4772 is_illegal = true;
4773 }
4774 } else { // not interface
4775 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4776 is_illegal = true;
4777 }
4778 }
4779
4780 if (is_illegal) {
4781 ResourceMark rm(THREAD);
4782 Exceptions::fthrow(
4783 THREAD_AND_LOCATION,
4784 vmSymbols::java_lang_ClassFormatError(),
4785 "Illegal field modifiers in class %s: 0x%X",
4786 _class_name->as_C_string(), flags);
4787 return;
4788 }
4789 }
4790
4791 void ClassFileParser::verify_legal_method_modifiers(
4792 jint flags, bool is_interface, Symbol* name, TRAPS) {
4793 if (!_need_verify) { return; }
4794
4795 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4796 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4797 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4798 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4799 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4800 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4801 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4802 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4803 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4804 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4805 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4806 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4807 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4808
4809 bool is_illegal = false;
4810
4811 if (is_interface) {
4812 if (major_gte_8) {
4813 // Class file version is JAVA_8_VERSION or later Methods of
4814 // interfaces may set any of the flags except ACC_PROTECTED,
4815 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4816 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4817 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4818 (is_native || is_protected || is_final || is_synchronized) ||
4819 // If a specific method of a class or interface has its
4820 // ACC_ABSTRACT flag set, it must not have any of its
4821 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4822 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4823 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4824 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4825 (is_abstract && (is_private || is_static || is_strict))) {
4826 is_illegal = true;
4827 }
4828 } else if (major_gte_15) {
4829 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4830 if (!is_public || is_static || is_final || is_synchronized ||
4831 is_native || !is_abstract || is_strict) {
4832 is_illegal = true;
4833 }
4834 } else {
4835 // Class file version is pre-JAVA_1_5_VERSION
4836 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4837 is_illegal = true;
4838 }
4839 }
4840 } else { // not interface
4841 if (is_initializer) {
4842 if (is_static || is_final || is_synchronized || is_native ||
4843 is_abstract || (major_gte_15 && is_bridge)) {
4844 is_illegal = true;
4845 }
4846 } else { // not initializer
4847 if (is_abstract) {
4848 if ((is_final || is_native || is_private || is_static ||
4849 (major_gte_15 && (is_synchronized || is_strict)))) {
4850 is_illegal = true;
4851 }
4852 }
4853 if (has_illegal_visibility(flags)) {
4854 is_illegal = true;
4855 }
4856 }
4857 }
4858
4859 if (is_illegal) {
4860 ResourceMark rm(THREAD);
4861 Exceptions::fthrow(
4862 THREAD_AND_LOCATION,
4863 vmSymbols::java_lang_ClassFormatError(),
4864 "Method %s in class %s has illegal modifiers: 0x%X",
4865 name->as_C_string(), _class_name->as_C_string(), flags);
4866 return;
4867 }
4868 }
4869
4870 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4871 assert(_need_verify, "only called when _need_verify is true");
4872 int i = 0;
4873 int count = length >> 2;
4874 for (int k=0; k<count; k++) {
4875 unsigned char b0 = buffer[i];
4876 unsigned char b1 = buffer[i+1];
4877 unsigned char b2 = buffer[i+2];
4878 unsigned char b3 = buffer[i+3];
4879 // For an unsigned char v,
4880 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4881 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4882 unsigned char res = b0 | b0 - 1 |
4883 b1 | b1 - 1 |
4884 b2 | b2 - 1 |
4885 b3 | b3 - 1;
4886 if (res >= 128) break;
4887 i += 4;
4888 }
4889 for(; i < length; i++) {
4890 unsigned short c;
4891 // no embedded zeros
4892 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4893 if(buffer[i] < 128) {
4894 continue;
4895 }
4896 if ((i + 5) < length) { // see if it's legal supplementary character
4897 if (UTF8::is_supplementary_character(&buffer[i])) {
4898 c = UTF8::get_supplementary_character(&buffer[i]);
4899 i += 5;
4900 continue;
4901 }
4902 }
4903 switch (buffer[i] >> 4) {
4904 default: break;
4905 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4906 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4907 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4908 c = (buffer[i] & 0x1F) << 6;
4909 i++;
4910 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4911 c += buffer[i] & 0x3F;
4912 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4913 // for classes with major > 47, c must a null or a character in its shortest form
4914 break;
4915 }
4916 }
4917 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4918 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4919 c = (buffer[i] & 0xF) << 12;
4920 i += 2;
4921 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4922 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4923 if (_major_version <= 47 || c >= 0x800) {
4924 // for classes with major > 47, c must be in its shortest form
4925 break;
4926 }
4927 }
4928 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4929 } // end of switch
4930 } // end of for
4931 }
4932
4933 // Checks if name is a legal class name.
4934 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4935 if (!_need_verify || _relax_verify) { return; }
4936
4937 char buf[fixed_buffer_size];
4938 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4939 unsigned int length = name->utf8_length();
4940 bool legal = false;
4941
4942 if (length > 0) {
4943 char* p;
4944 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4945 p = skip_over_field_signature(bytes, false, length, CHECK);
4946 legal = (p != NULL) && ((p - bytes) == (int)length);
4947 } else if (_major_version < JAVA_1_5_VERSION) {
4948 if (bytes[0] != '<') {
4949 p = skip_over_field_name(bytes, true, length);
4950 legal = (p != NULL) && ((p - bytes) == (int)length);
4951 }
4952 } else {
4953 // 4900761: relax the constraints based on JSR202 spec
4954 // Class names may be drawn from the entire Unicode character set.
4955 // Identifiers between '/' must be unqualified names.
4956 // The utf8 string has been verified when parsing cpool entries.
4957 legal = verify_unqualified_name(bytes, length, LegalClass);
4958 }
4959 }
4960 if (!legal) {
4961 ResourceMark rm(THREAD);
4962 Exceptions::fthrow(
4963 THREAD_AND_LOCATION,
4964 vmSymbols::java_lang_ClassFormatError(),
4965 "Illegal class name \"%s\" in class file %s", bytes,
4966 _class_name->as_C_string()
4967 );
4968 return;
4969 }
4970 }
4971
4972 // Checks if name is a legal field name.
4973 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4974 if (!_need_verify || _relax_verify) { return; }
4975
4976 char buf[fixed_buffer_size];
4977 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4978 unsigned int length = name->utf8_length();
4979 bool legal = false;
4980
4981 if (length > 0) {
4982 if (_major_version < JAVA_1_5_VERSION) {
4983 if (bytes[0] != '<') {
4984 char* p = skip_over_field_name(bytes, false, length);
4985 legal = (p != NULL) && ((p - bytes) == (int)length);
4986 }
4987 } else {
4988 // 4881221: relax the constraints based on JSR202 spec
4989 legal = verify_unqualified_name(bytes, length, LegalField);
4990 }
4991 }
4992
4993 if (!legal) {
4994 ResourceMark rm(THREAD);
4995 Exceptions::fthrow(
4996 THREAD_AND_LOCATION,
4997 vmSymbols::java_lang_ClassFormatError(),
4998 "Illegal field name \"%s\" in class %s", bytes,
4999 _class_name->as_C_string()
5000 );
5001 return;
5002 }
5003 }
5004
5005 // Checks if name is a legal method name.
5006 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5007 if (!_need_verify || _relax_verify) { return; }
5008
5009 assert(name != NULL, "method name is null");
5010 char buf[fixed_buffer_size];
5011 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5012 unsigned int length = name->utf8_length();
5013 bool legal = false;
5014
5015 if (length > 0) {
5016 if (bytes[0] == '<') {
5017 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5018 legal = true;
5019 }
5020 } else if (_major_version < JAVA_1_5_VERSION) {
5021 char* p;
5022 p = skip_over_field_name(bytes, false, length);
5023 legal = (p != NULL) && ((p - bytes) == (int)length);
5024 } else {
5025 // 4881221: relax the constraints based on JSR202 spec
5026 legal = verify_unqualified_name(bytes, length, LegalMethod);
5027 }
5028 }
5029
5030 if (!legal) {
5031 ResourceMark rm(THREAD);
5032 Exceptions::fthrow(
5033 THREAD_AND_LOCATION,
5034 vmSymbols::java_lang_ClassFormatError(),
5035 "Illegal method name \"%s\" in class %s", bytes,
5036 _class_name->as_C_string()
5037 );
5038 return;
5039 }
5040 }
5041
5042
5043 // Checks if signature is a legal field signature.
5044 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5045 if (!_need_verify) { return; }
5046
5047 char buf[fixed_buffer_size];
5048 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5049 unsigned int length = signature->utf8_length();
5050 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5051
5052 if (p == NULL || (p - bytes) != (int)length) {
5053 throwIllegalSignature("Field", name, signature, CHECK);
5054 }
5055 }
5056
5057 // Checks if signature is a legal method signature.
5058 // Returns number of parameters
5059 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5060 if (!_need_verify) {
5061 // make sure caller's args_size will be less than 0 even for non-static
5062 // method so it will be recomputed in compute_size_of_parameters().
5063 return -2;
5064 }
5065
5066 unsigned int args_size = 0;
5067 char buf[fixed_buffer_size];
5068 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5069 unsigned int length = signature->utf8_length();
5070 char* nextp;
5071
5072 // The first character must be a '('
5073 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5074 length--;
5075 // Skip over legal field signatures
5076 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5077 while ((length > 0) && (nextp != NULL)) {
5078 args_size++;
5079 if (p[0] == 'J' || p[0] == 'D') {
5080 args_size++;
5081 }
5082 length -= nextp - p;
5083 p = nextp;
5084 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5085 }
5086 // The first non-signature thing better be a ')'
5087 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5088 length--;
5089 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5090 // All internal methods must return void
5091 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5092 return args_size;
5093 }
5094 } else {
5095 // Now we better just have a return value
5096 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5097 if (nextp && ((int)length == (nextp - p))) {
5098 return args_size;
5099 }
5100 }
5101 }
5102 }
5103 // Report error
5104 throwIllegalSignature("Method", name, signature, CHECK_0);
5105 return 0;
5106 }
5107
5108
5109 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5110 // Method names also may not contain the characters '<' or '>', unless <init>
5111 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5112 // method. Because these names have been checked as special cases before
5113 // calling this method in verify_legal_method_name.
5114 bool ClassFileParser::verify_unqualified_name(
5115 char* name, unsigned int length, int type) {
5116 jchar ch;
5117
5118 for (char* p = name; p != name + length; ) {
5119 ch = *p;
5120 if (ch < 128) {
5121 p++;
5122 if (ch == '.' || ch == ';' || ch == '[' ) {
5123 return false; // do not permit '.', ';', or '['
5124 }
5125 if (type != LegalClass && ch == '/') {
5126 return false; // do not permit '/' unless it's class name
5127 }
5128 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5129 return false; // do not permit '<' or '>' in method names
5130 }
5131 } else {
5132 char* tmp_p = UTF8::next(p, &ch);
5133 p = tmp_p;
5134 }
5135 }
5136 return true;
5137 }
5138
5139
5140 // Take pointer to a string. Skip over the longest part of the string that could
5141 // be taken as a fieldname. Allow '/' if slash_ok is true.
5142 // Return a pointer to just past the fieldname.
5143 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5144 // being true, we saw consecutive slashes (meaning we were looking for a
5145 // qualified path but found something that was badly-formed).
5146 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5147 char* p;
5148 jchar ch;
5149 jboolean last_is_slash = false;
5150 jboolean not_first_ch = false;
5151
5152 for (p = name; p != name + length; not_first_ch = true) {
5153 char* old_p = p;
5154 ch = *p;
5155 if (ch < 128) {
5156 p++;
5157 // quick check for ascii
5158 if ((ch >= 'a' && ch <= 'z') ||
5159 (ch >= 'A' && ch <= 'Z') ||
5160 (ch == '_' || ch == '$') ||
5161 (not_first_ch && ch >= '0' && ch <= '9')) {
5162 last_is_slash = false;
5163 continue;
5164 }
5165 if (slash_ok && ch == '/') {
5166 if (last_is_slash) {
5167 return NULL; // Don't permit consecutive slashes
5168 }
5169 last_is_slash = true;
5170 continue;
5171 }
5172 } else {
5173 jint unicode_ch;
5174 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5175 p = tmp_p;
5176 last_is_slash = false;
5177 // Check if ch is Java identifier start or is Java identifier part
5178 // 4672820: call java.lang.Character methods directly without generating separate tables.
5179 EXCEPTION_MARK;
5180 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5181
5182 // return value
5183 JavaValue result(T_BOOLEAN);
5184 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5185 JavaCallArguments args;
5186 args.push_int(unicode_ch);
5187
5188 // public static boolean isJavaIdentifierStart(char ch);
5189 JavaCalls::call_static(&result,
5190 klass,
5191 vmSymbols::isJavaIdentifierStart_name(),
5192 vmSymbols::int_bool_signature(),
5193 &args,
5194 THREAD);
5195
5196 if (HAS_PENDING_EXCEPTION) {
5197 CLEAR_PENDING_EXCEPTION;
5198 return 0;
5199 }
5200 if (result.get_jboolean()) {
5201 continue;
5202 }
5203
5204 if (not_first_ch) {
5205 // public static boolean isJavaIdentifierPart(char ch);
5206 JavaCalls::call_static(&result,
5207 klass,
5208 vmSymbols::isJavaIdentifierPart_name(),
5209 vmSymbols::int_bool_signature(),
5210 &args,
5211 THREAD);
5212
5213 if (HAS_PENDING_EXCEPTION) {
5214 CLEAR_PENDING_EXCEPTION;
5215 return 0;
5216 }
5217
5218 if (result.get_jboolean()) {
5219 continue;
5220 }
5221 }
5222 }
5223 return (not_first_ch) ? old_p : NULL;
5224 }
5225 return (not_first_ch) ? p : NULL;
5226 }
5227
5228
5229 // Take pointer to a string. Skip over the longest part of the string that could
5230 // be taken as a field signature. Allow "void" if void_ok.
5231 // Return a pointer to just past the signature.
5232 // Return NULL if no legal signature is found.
5233 char* ClassFileParser::skip_over_field_signature(char* signature,
5234 bool void_ok,
5235 unsigned int length,
5236 TRAPS) {
5237 unsigned int array_dim = 0;
5238 while (length > 0) {
5239 switch (signature[0]) {
5240 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5241 case JVM_SIGNATURE_BOOLEAN:
5242 case JVM_SIGNATURE_BYTE:
5243 case JVM_SIGNATURE_CHAR:
5244 case JVM_SIGNATURE_SHORT:
5245 case JVM_SIGNATURE_INT:
5246 case JVM_SIGNATURE_FLOAT:
5247 case JVM_SIGNATURE_LONG:
5248 case JVM_SIGNATURE_DOUBLE:
5249 return signature + 1;
5250 case JVM_SIGNATURE_CLASS: {
5251 if (_major_version < JAVA_1_5_VERSION) {
5252 // Skip over the class name if one is there
5253 char* p = skip_over_field_name(signature + 1, true, --length);
5254
5255 // The next character better be a semicolon
5256 if (p && (p - signature) > 1 && p[0] == ';') {
5257 return p + 1;
5258 }
5259 } else {
5260 // 4900761: For class version > 48, any unicode is allowed in class name.
5261 length--;
5262 signature++;
5263 while (length > 0 && signature[0] != ';') {
5264 if (signature[0] == '.') {
5265 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5266 }
5267 length--;
5268 signature++;
5269 }
5270 if (signature[0] == ';') { return signature + 1; }
5271 }
5272
5273 return NULL;
5274 }
5275 case JVM_SIGNATURE_ARRAY:
5276 array_dim++;
5277 if (array_dim > 255) {
5278 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5279 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5280 }
5281 // The rest of what's there better be a legal signature
5282 signature++;
5283 length--;
5284 void_ok = false;
5285 break;
5286
5287 default:
5288 return NULL;
5289 }
5290 }
5291 return NULL;
5292 }