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 bool privileged = false;
1806 if (loader_data->is_the_null_class_loader_data()) {
1807 // Privileged code can use all annotations. Other code silently drops some.
1808 privileged = true;
1809 }
1810 switch (sid) {
1811 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1812 if (_location != _in_method) break; // only allow for methods
1813 if (!privileged) break; // only allow in privileged code
1814 return _method_ForceInline;
1815 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1816 if (_location != _in_method) break; // only allow for methods
1817 if (!privileged) break; // only allow in privileged code
1818 return _method_DontInline;
1819 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1820 if (_location != _in_method) break; // only allow for methods
1821 if (!privileged) break; // only allow in privileged code
1822 return _method_LambdaForm_Compiled;
1823 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1824 if (_location != _in_method) break; // only allow for methods
1825 if (!privileged) break; // only allow in privileged code
1826 return _method_LambdaForm_Hidden;
1827 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1828 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1829 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1830 return _sun_misc_Contended;
1831 default: break;
1832 }
1833 return AnnotationCollector::_unknown;
1834 }
1835
1836 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1837 if (is_contended())
1838 f->set_contended_group(contended_group());
1839 }
1840
1841 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1842 if (has_annotation(_method_ForceInline))
1843 m->set_force_inline(true);
1844 if (has_annotation(_method_DontInline))
1845 m->set_dont_inline(true);
1846 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1847 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1848 if (has_annotation(_method_LambdaForm_Hidden))
1849 m->set_hidden(true);
1850 }
1851
1852 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1853 k->set_is_contended(is_contended());
1854 }
1855
1856
1857 #define MAX_ARGS_SIZE 255
1858 #define MAX_CODE_SIZE 65535
1859 #define INITIAL_MAX_LVT_NUMBER 256
1860
1861 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1862 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1863 // Method* to save footprint, so we only know the size of the resulting Method* when the
1864 // entire method attribute is parsed.
1865 //
1866 // The promoted_flags parameter is used to pass relevant access_flags
1867 // from the method back up to the containing klass. These flag values
1868 // are added to klass's access_flags.
1869
1870 methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
1871 constantPoolHandle cp,
1872 bool is_interface,
1873 AccessFlags *promoted_flags,
1874 AnnotationArray** method_annotations,
1875 AnnotationArray** method_parameter_annotations,
1876 AnnotationArray** method_default_annotations,
1877 AnnotationArray** method_type_annotations,
1878 TRAPS) {
1879 ClassFileStream* cfs = stream();
1880 methodHandle nullHandle;
1881 ResourceMark rm(THREAD);
1882 // Parse fixed parts
1883 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1884
1885 int flags = cfs->get_u2_fast();
1886 u2 name_index = cfs->get_u2_fast();
1887 int cp_size = cp->length();
1888 check_property(
1889 valid_cp_range(name_index, cp_size) &&
1890 cp->tag_at(name_index).is_utf8(),
1891 "Illegal constant pool index %u for method name in class file %s",
1892 name_index, CHECK_(nullHandle));
1893 Symbol* name = cp->symbol_at(name_index);
1894 verify_legal_method_name(name, CHECK_(nullHandle));
1895
1896 u2 signature_index = cfs->get_u2_fast();
1897 guarantee_property(
1898 valid_cp_range(signature_index, cp_size) &&
1899 cp->tag_at(signature_index).is_utf8(),
1900 "Illegal constant pool index %u for method signature in class file %s",
1901 signature_index, CHECK_(nullHandle));
1902 Symbol* signature = cp->symbol_at(signature_index);
1903
1904 AccessFlags access_flags;
1905 if (name == vmSymbols::class_initializer_name()) {
1906 // We ignore the other access flags for a valid class initializer.
1907 // (JVM Spec 2nd ed., chapter 4.6)
1908 if (_major_version < 51) { // backward compatibility
1909 flags = JVM_ACC_STATIC;
1910 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1911 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1912 }
1913 } else {
1914 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1915 }
1916
1917 int args_size = -1; // only used when _need_verify is true
1918 if (_need_verify) {
1919 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1920 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1921 if (args_size > MAX_ARGS_SIZE) {
1922 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1923 }
1924 }
1925
1926 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1927
1928 // Default values for code and exceptions attribute elements
1929 u2 max_stack = 0;
1930 u2 max_locals = 0;
1931 u4 code_length = 0;
1932 u1* code_start = 0;
1933 u2 exception_table_length = 0;
1934 u2* exception_table_start = NULL;
1935 Array<int>* exception_handlers = Universe::the_empty_int_array();
1936 u2 checked_exceptions_length = 0;
1937 u2* checked_exceptions_start = NULL;
1938 CompressedLineNumberWriteStream* linenumber_table = NULL;
1939 int linenumber_table_length = 0;
1940 int total_lvt_length = 0;
1941 u2 lvt_cnt = 0;
1942 u2 lvtt_cnt = 0;
1943 bool lvt_allocated = false;
1944 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1945 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1946 u2* localvariable_table_length;
1947 u2** localvariable_table_start;
1948 u2* localvariable_type_table_length;
1949 u2** localvariable_type_table_start;
1950 u2 method_parameters_length = 0;
1951 u1* method_parameters_data = NULL;
1952 bool parsed_code_attribute = false;
1953 bool parsed_checked_exceptions_attribute = false;
1954 bool parsed_stackmap_attribute = false;
1955 // stackmap attribute - JDK1.5
1956 Array<u1>* stackmap_data = NULL;
1957 u2 generic_signature_index = 0;
1958 MethodAnnotationCollector parsed_annotations;
1959 u1* runtime_visible_annotations = NULL;
1960 int runtime_visible_annotations_length = 0;
1961 u1* runtime_invisible_annotations = NULL;
1962 int runtime_invisible_annotations_length = 0;
1963 u1* runtime_visible_parameter_annotations = NULL;
1964 int runtime_visible_parameter_annotations_length = 0;
1965 u1* runtime_invisible_parameter_annotations = NULL;
1966 int runtime_invisible_parameter_annotations_length = 0;
1967 u1* runtime_visible_type_annotations = NULL;
1968 int runtime_visible_type_annotations_length = 0;
1969 u1* runtime_invisible_type_annotations = NULL;
1970 int runtime_invisible_type_annotations_length = 0;
1971 u1* annotation_default = NULL;
1972 int annotation_default_length = 0;
1973
1974 // Parse code and exceptions attribute
1975 u2 method_attributes_count = cfs->get_u2_fast();
1976 while (method_attributes_count--) {
1977 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1978 u2 method_attribute_name_index = cfs->get_u2_fast();
1979 u4 method_attribute_length = cfs->get_u4_fast();
1980 check_property(
1981 valid_cp_range(method_attribute_name_index, cp_size) &&
1982 cp->tag_at(method_attribute_name_index).is_utf8(),
1983 "Invalid method attribute name index %u in class file %s",
1984 method_attribute_name_index, CHECK_(nullHandle));
1985
1986 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1987 if (method_attribute_name == vmSymbols::tag_code()) {
1988 // Parse Code attribute
1989 if (_need_verify) {
1990 guarantee_property(
1991 !access_flags.is_native() && !access_flags.is_abstract(),
1992 "Code attribute in native or abstract methods in class file %s",
1993 CHECK_(nullHandle));
1994 }
1995 if (parsed_code_attribute) {
1996 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1997 }
1998 parsed_code_attribute = true;
1999
2000 // Stack size, locals size, and code size
2001 if (_major_version == 45 && _minor_version <= 2) {
2002 cfs->guarantee_more(4, CHECK_(nullHandle));
2003 max_stack = cfs->get_u1_fast();
2004 max_locals = cfs->get_u1_fast();
2005 code_length = cfs->get_u2_fast();
2006 } else {
2007 cfs->guarantee_more(8, CHECK_(nullHandle));
2008 max_stack = cfs->get_u2_fast();
2009 max_locals = cfs->get_u2_fast();
2010 code_length = cfs->get_u4_fast();
2011 }
2012 if (_need_verify) {
2013 guarantee_property(args_size <= max_locals,
2014 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2015 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2016 "Invalid method Code length %u in class file %s",
2017 code_length, CHECK_(nullHandle));
2018 }
2019 // Code pointer
2020 code_start = cfs->get_u1_buffer();
2021 assert(code_start != NULL, "null code start");
2022 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2023 cfs->skip_u1_fast(code_length);
2024
2025 // Exception handler table
2026 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2027 exception_table_length = cfs->get_u2_fast();
2028 if (exception_table_length > 0) {
2029 exception_table_start =
2030 parse_exception_table(loader_data, code_length, exception_table_length, cp, CHECK_(nullHandle));
2031 }
2032
2033 // Parse additional attributes in code attribute
2034 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2035 u2 code_attributes_count = cfs->get_u2_fast();
2036
2037 unsigned int calculated_attribute_length = 0;
2038
2039 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2040 calculated_attribute_length =
2041 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2042 } else {
2043 // max_stack, locals and length are smaller in pre-version 45.2 classes
2044 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2045 }
2046 calculated_attribute_length +=
2047 code_length +
2048 sizeof(exception_table_length) +
2049 sizeof(code_attributes_count) +
2050 exception_table_length *
2051 ( sizeof(u2) + // start_pc
2052 sizeof(u2) + // end_pc
2053 sizeof(u2) + // handler_pc
2054 sizeof(u2) ); // catch_type_index
2055
2056 while (code_attributes_count--) {
2057 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2058 u2 code_attribute_name_index = cfs->get_u2_fast();
2059 u4 code_attribute_length = cfs->get_u4_fast();
2060 calculated_attribute_length += code_attribute_length +
2061 sizeof(code_attribute_name_index) +
2062 sizeof(code_attribute_length);
2063 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
2064 cp->tag_at(code_attribute_name_index).is_utf8(),
2065 "Invalid code attribute name index %u in class file %s",
2066 code_attribute_name_index,
2067 CHECK_(nullHandle));
2068 if (LoadLineNumberTables &&
2069 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2070 // Parse and compress line number table
2071 parse_linenumber_table(code_attribute_length, code_length,
2072 &linenumber_table, CHECK_(nullHandle));
2073
2074 } else if (LoadLocalVariableTables &&
2075 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2076 // Parse local variable table
2077 if (!lvt_allocated) {
2078 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2079 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2080 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2081 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2082 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2083 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2084 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2085 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2086 lvt_allocated = true;
2087 }
2088 if (lvt_cnt == max_lvt_cnt) {
2089 max_lvt_cnt <<= 1;
2090 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2091 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2092 }
2093 localvariable_table_start[lvt_cnt] =
2094 parse_localvariable_table(code_length,
2095 max_locals,
2096 code_attribute_length,
2097 cp,
2098 &localvariable_table_length[lvt_cnt],
2099 false, // is not LVTT
2100 CHECK_(nullHandle));
2101 total_lvt_length += localvariable_table_length[lvt_cnt];
2102 lvt_cnt++;
2103 } else if (LoadLocalVariableTypeTables &&
2104 _major_version >= JAVA_1_5_VERSION &&
2105 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2106 if (!lvt_allocated) {
2107 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2108 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2109 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2110 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2111 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2112 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2113 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2114 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2115 lvt_allocated = true;
2116 }
2117 // Parse local variable type table
2118 if (lvtt_cnt == max_lvtt_cnt) {
2119 max_lvtt_cnt <<= 1;
2120 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2121 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2122 }
2123 localvariable_type_table_start[lvtt_cnt] =
2124 parse_localvariable_table(code_length,
2125 max_locals,
2126 code_attribute_length,
2127 cp,
2128 &localvariable_type_table_length[lvtt_cnt],
2129 true, // is LVTT
2130 CHECK_(nullHandle));
2131 lvtt_cnt++;
2132 } else if (UseSplitVerifier &&
2133 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2134 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2135 // Stack map is only needed by the new verifier in JDK1.5.
2136 if (parsed_stackmap_attribute) {
2137 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2138 }
2139 stackmap_data = parse_stackmap_table(loader_data, code_attribute_length, CHECK_(nullHandle));
2140 parsed_stackmap_attribute = true;
2141 } else {
2142 // Skip unknown attributes
2143 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2144 }
2145 }
2146 // check method attribute length
2147 if (_need_verify) {
2148 guarantee_property(method_attribute_length == calculated_attribute_length,
2149 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2150 }
2151 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2152 // Parse Exceptions attribute
2153 if (parsed_checked_exceptions_attribute) {
2154 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2155 }
2156 parsed_checked_exceptions_attribute = true;
2157 checked_exceptions_start =
2158 parse_checked_exceptions(&checked_exceptions_length,
2159 method_attribute_length,
2160 cp, CHECK_(nullHandle));
2161 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2162 method_parameters_length = cfs->get_u1_fast();
2163 // Track the actual size (note: this is written for clarity; a
2164 // decent compiler will CSE and constant-fold this into a single
2165 // expression)
2166 u2 actual_size = 1;
2167 method_parameters_data = cfs->get_u1_buffer();
2168 actual_size += 2 * method_parameters_length;
2169 cfs->skip_u2_fast(method_parameters_length);
2170 actual_size += 2 * method_parameters_length;
2171 cfs->skip_u2_fast(method_parameters_length);
2172 // Enforce attribute length
2173 if (method_attribute_length != actual_size) {
2174 classfile_parse_error(
2175 "Invalid MethodParameters method attribute length %u in class file %s",
2176 method_attribute_length, CHECK_(nullHandle));
2177 }
2178 // ignore this attribute if it cannot be reflected
2179 if (!SystemDictionary::Parameter_klass_loaded())
2180 method_parameters_length = 0;
2181 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2182 if (method_attribute_length != 0) {
2183 classfile_parse_error(
2184 "Invalid Synthetic method attribute length %u in class file %s",
2185 method_attribute_length, CHECK_(nullHandle));
2186 }
2187 // Should we check that there hasn't already been a synthetic attribute?
2188 access_flags.set_is_synthetic();
2189 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2190 if (method_attribute_length != 0) {
2191 classfile_parse_error(
2192 "Invalid Deprecated method attribute length %u in class file %s",
2193 method_attribute_length, CHECK_(nullHandle));
2194 }
2195 } else if (_major_version >= JAVA_1_5_VERSION) {
2196 if (method_attribute_name == vmSymbols::tag_signature()) {
2197 if (method_attribute_length != 2) {
2198 classfile_parse_error(
2199 "Invalid Signature attribute length %u in class file %s",
2200 method_attribute_length, CHECK_(nullHandle));
2201 }
2202 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2203 generic_signature_index = cfs->get_u2_fast();
2204 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2205 runtime_visible_annotations_length = method_attribute_length;
2206 runtime_visible_annotations = cfs->get_u1_buffer();
2207 assert(runtime_visible_annotations != NULL, "null visible annotations");
2208 parse_annotations(loader_data,
2209 runtime_visible_annotations,
2210 runtime_visible_annotations_length, cp, &parsed_annotations,
2211 CHECK_(nullHandle));
2212 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2213 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2214 runtime_invisible_annotations_length = method_attribute_length;
2215 runtime_invisible_annotations = cfs->get_u1_buffer();
2216 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2217 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2218 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2219 runtime_visible_parameter_annotations_length = method_attribute_length;
2220 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2221 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2222 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2223 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2224 runtime_invisible_parameter_annotations_length = method_attribute_length;
2225 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2226 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2227 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2228 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2229 annotation_default_length = method_attribute_length;
2230 annotation_default = cfs->get_u1_buffer();
2231 assert(annotation_default != NULL, "null annotation default");
2232 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2233 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2234 runtime_visible_type_annotations_length = method_attribute_length;
2235 runtime_visible_type_annotations = cfs->get_u1_buffer();
2236 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2237 // No need for the VM to parse Type annotations
2238 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2239 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2240 runtime_invisible_type_annotations_length = method_attribute_length;
2241 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2242 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2243 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2244 } else {
2245 // Skip unknown attributes
2246 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2247 }
2248 } else {
2249 // Skip unknown attributes
2250 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2251 }
2252 }
2253
2254 if (linenumber_table != NULL) {
2255 linenumber_table->write_terminator();
2256 linenumber_table_length = linenumber_table->position();
2257 }
2258
2259 // Make sure there's at least one Code attribute in non-native/non-abstract method
2260 if (_need_verify) {
2261 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2262 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2263 }
2264
2265 // All sizing information for a Method* is finally available, now create it
2266 Method* m = Method::allocate(
2267 loader_data, code_length, access_flags, linenumber_table_length,
2268 total_lvt_length, exception_table_length, checked_exceptions_length,
2269 method_parameters_length, generic_signature_index,
2270 ConstMethod::NORMAL, CHECK_(nullHandle));
2271
2272 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2273
2274 // Fill in information from fixed part (access_flags already set)
2275 m->set_constants(cp());
2276 m->set_name_index(name_index);
2277 m->set_signature_index(signature_index);
2278 #ifdef CC_INTERP
2279 // hmm is there a gc issue here??
2280 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2281 m->set_result_index(rtf.type());
2282 #endif
2283
2284 if (args_size >= 0) {
2285 m->set_size_of_parameters(args_size);
2286 } else {
2287 m->compute_size_of_parameters(THREAD);
2288 }
2289 #ifdef ASSERT
2290 if (args_size >= 0) {
2291 m->compute_size_of_parameters(THREAD);
2292 assert(args_size == m->size_of_parameters(), "");
2293 }
2294 #endif
2295
2296 // Fill in code attribute information
2297 m->set_max_stack(max_stack);
2298 m->set_max_locals(max_locals);
2299 m->constMethod()->set_stackmap_data(stackmap_data);
2300
2301 // Copy byte codes
2302 m->set_code(code_start);
2303
2304 // Copy line number table
2305 if (linenumber_table != NULL) {
2306 memcpy(m->compressed_linenumber_table(),
2307 linenumber_table->buffer(), linenumber_table_length);
2308 }
2309
2310 // Copy exception table
2311 if (exception_table_length > 0) {
2312 int size =
2313 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2314 copy_u2_with_conversion((u2*) m->exception_table_start(),
2315 exception_table_start, size);
2316 }
2317
2318 // Copy method parameters
2319 if (method_parameters_length > 0) {
2320 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2321 for(int i = 0; i < method_parameters_length; i++) {
2322 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2323 method_parameters_data += 2;
2324 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2325 method_parameters_data += 2;
2326 }
2327 }
2328
2329 // Copy checked exceptions
2330 if (checked_exceptions_length > 0) {
2331 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2332 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2333 }
2334
2335 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2336 *
2337 * Rules for LVT's and LVTT's are:
2338 * - There can be any number of LVT's and LVTT's.
2339 * - If there are n LVT's, it is the same as if there was just
2340 * one LVT containing all the entries from the n LVT's.
2341 * - There may be no more than one LVT entry per local variable.
2342 * Two LVT entries are 'equal' if these fields are the same:
2343 * start_pc, length, name, slot
2344 * - There may be no more than one LVTT entry per each LVT entry.
2345 * Each LVTT entry has to match some LVT entry.
2346 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2347 */
2348 if (total_lvt_length > 0) {
2349 int tbl_no, idx;
2350
2351 promoted_flags->set_has_localvariable_table();
2352
2353 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2354 initialize_hashtable(lvt_Hash);
2355
2356 // To fill LocalVariableTable in
2357 Classfile_LVT_Element* cf_lvt;
2358 LocalVariableTableElement* lvt = m->localvariable_table_start();
2359
2360 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2361 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2362 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2363 copy_lvt_element(&cf_lvt[idx], lvt);
2364 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2365 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2366 && _need_verify
2367 && _major_version >= JAVA_1_5_VERSION ) {
2368 clear_hashtable(lvt_Hash);
2369 classfile_parse_error("Duplicated LocalVariableTable attribute "
2370 "entry for '%s' in class file %s",
2371 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2372 CHECK_(nullHandle));
2373 }
2374 }
2375 }
2376
2377 // To merge LocalVariableTable and LocalVariableTypeTable
2378 Classfile_LVT_Element* cf_lvtt;
2379 LocalVariableTableElement lvtt_elem;
2380
2381 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2382 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2383 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2384 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2385 int index = hash(&lvtt_elem);
2386 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2387 if (entry == NULL) {
2388 if (_need_verify) {
2389 clear_hashtable(lvt_Hash);
2390 classfile_parse_error("LVTT entry for '%s' in class file %s "
2391 "does not match any LVT entry",
2392 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2393 CHECK_(nullHandle));
2394 }
2395 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2396 clear_hashtable(lvt_Hash);
2397 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2398 "entry for '%s' in class file %s",
2399 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2400 CHECK_(nullHandle));
2401 } else {
2402 // to add generic signatures into LocalVariableTable
2403 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2404 }
2405 }
2406 }
2407 clear_hashtable(lvt_Hash);
2408 }
2409
2410 if (parsed_annotations.has_any_annotations())
2411 parsed_annotations.apply_to(m);
2412 *method_annotations = assemble_annotations(loader_data,
2413 runtime_visible_annotations,
2414 runtime_visible_annotations_length,
2415 runtime_invisible_annotations,
2416 runtime_invisible_annotations_length,
2417 CHECK_(nullHandle));
2418 *method_parameter_annotations = assemble_annotations(loader_data,
2419 runtime_visible_parameter_annotations,
2420 runtime_visible_parameter_annotations_length,
2421 runtime_invisible_parameter_annotations,
2422 runtime_invisible_parameter_annotations_length,
2423 CHECK_(nullHandle));
2424 *method_default_annotations = assemble_annotations(loader_data,
2425 annotation_default,
2426 annotation_default_length,
2427 NULL,
2428 0,
2429 CHECK_(nullHandle));
2430 *method_type_annotations = assemble_annotations(loader_data,
2431 runtime_visible_type_annotations,
2432 runtime_visible_type_annotations_length,
2433 runtime_invisible_type_annotations,
2434 runtime_invisible_type_annotations_length,
2435 CHECK_(nullHandle));
2436
2437 if (name == vmSymbols::finalize_method_name() &&
2438 signature == vmSymbols::void_method_signature()) {
2439 if (m->is_empty_method()) {
2440 _has_empty_finalizer = true;
2441 } else {
2442 _has_finalizer = true;
2443 }
2444 }
2445 if (name == vmSymbols::object_initializer_name() &&
2446 signature == vmSymbols::void_method_signature() &&
2447 m->is_vanilla_constructor()) {
2448 _has_vanilla_constructor = true;
2449 }
2450
2451 return m;
2452 }
2453
2454
2455 // The promoted_flags parameter is used to pass relevant access_flags
2456 // from the methods back up to the containing klass. These flag values
2457 // are added to klass's access_flags.
2458
2459 Array<Method*>* ClassFileParser::parse_methods(ClassLoaderData* loader_data,
2460 constantPoolHandle cp,
2461 bool is_interface,
2462 AccessFlags* promoted_flags,
2463 bool* has_final_method,
2464 Array<AnnotationArray*>** methods_annotations,
2465 Array<AnnotationArray*>** methods_parameter_annotations,
2466 Array<AnnotationArray*>** methods_default_annotations,
2467 Array<AnnotationArray*>** methods_type_annotations,
2468 bool* has_default_methods,
2469 TRAPS) {
2470 ClassFileStream* cfs = stream();
2471 AnnotationArray* method_annotations = NULL;
2472 AnnotationArray* method_parameter_annotations = NULL;
2473 AnnotationArray* method_default_annotations = NULL;
2474 AnnotationArray* method_type_annotations = NULL;
2475 cfs->guarantee_more(2, CHECK_NULL); // length
2476 u2 length = cfs->get_u2_fast();
2477 if (length == 0) {
2478 return Universe::the_empty_method_array();
2479 } else {
2480 // FIXME: Handle leaks at later failures.
2481 Array<Method*>* methods = MetadataFactory::new_array<Method*>(loader_data, length, NULL, CHECK_NULL);
2482
2483 HandleMark hm(THREAD);
2484 for (int index = 0; index < length; index++) {
2485 methodHandle method = parse_method(loader_data,
2486 cp, is_interface,
2487 promoted_flags,
2488 &method_annotations,
2489 &method_parameter_annotations,
2490 &method_default_annotations,
2491 &method_type_annotations,
2492 CHECK_NULL);
2493
2494 if (method->is_final()) {
2495 *has_final_method = true;
2496 }
2497 if (is_interface && !method->is_abstract() && !method->is_static()) {
2498 // default method
2499 *has_default_methods = true;
2500 }
2501 methods->at_put(index, method());
2502
2503 if (method_annotations != NULL) {
2504 if (*methods_annotations == NULL) {
2505 *methods_annotations =
2506 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2507 }
2508 (*methods_annotations)->at_put(index, method_annotations);
2509 }
2510
2511 if (method_parameter_annotations != NULL) {
2512 if (*methods_parameter_annotations == NULL) {
2513 *methods_parameter_annotations =
2514 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2515 }
2516 (*methods_parameter_annotations)->at_put(index, method_parameter_annotations);
2517 }
2518
2519 if (method_default_annotations != NULL) {
2520 if (*methods_default_annotations == NULL) {
2521 *methods_default_annotations =
2522 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2523 }
2524 (*methods_default_annotations)->at_put(index, method_default_annotations);
2525 }
2526
2527 if (method_type_annotations != NULL) {
2528 if (*methods_type_annotations == NULL) {
2529 *methods_type_annotations =
2530 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2531 }
2532 (*methods_type_annotations)->at_put(index, method_type_annotations);
2533 }
2534 }
2535
2536 if (_need_verify && length > 1) {
2537 // Check duplicated methods
2538 ResourceMark rm(THREAD);
2539 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2540 THREAD, NameSigHash*, HASH_ROW_SIZE);
2541 initialize_hashtable(names_and_sigs);
2542 bool dup = false;
2543 {
2544 debug_only(No_Safepoint_Verifier nsv;)
2545 for (int i = 0; i < length; i++) {
2546 Method* m = methods->at(i);
2547 // If no duplicates, add name/signature in hashtable names_and_sigs.
2548 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2549 dup = true;
2550 break;
2551 }
2552 }
2553 }
2554 if (dup) {
2555 classfile_parse_error("Duplicate method name&signature in class file %s",
2556 CHECK_NULL);
2557 }
2558 }
2559 return methods;
2560 }
2561 }
2562
2563
2564 Array<int>* ClassFileParser::sort_methods(ClassLoaderData* loader_data,
2565 Array<Method*>* methods,
2566 Array<AnnotationArray*>* methods_annotations,
2567 Array<AnnotationArray*>* methods_parameter_annotations,
2568 Array<AnnotationArray*>* methods_default_annotations,
2569 Array<AnnotationArray*>* methods_type_annotations,
2570 TRAPS) {
2571 int length = methods->length();
2572 // If JVMTI original method ordering or sharing is enabled we have to
2573 // remember the original class file ordering.
2574 // We temporarily use the vtable_index field in the Method* to store the
2575 // class file index, so we can read in after calling qsort.
2576 // Put the method ordering in the shared archive.
2577 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2578 for (int index = 0; index < length; index++) {
2579 Method* m = methods->at(index);
2580 assert(!m->valid_vtable_index(), "vtable index should not be set");
2581 m->set_vtable_index(index);
2582 }
2583 }
2584 // Sort method array by ascending method name (for faster lookups & vtable construction)
2585 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2586 Method::sort_methods(methods, methods_annotations,
2587 methods_parameter_annotations,
2588 methods_default_annotations,
2589 methods_type_annotations);
2590
2591 // If JVMTI original method ordering or sharing is enabled construct int
2592 // array remembering the original ordering
2593 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2594 Array<int>* method_ordering = MetadataFactory::new_array<int>(loader_data, length, CHECK_NULL);
2595 for (int index = 0; index < length; index++) {
2596 Method* m = methods->at(index);
2597 int old_index = m->vtable_index();
2598 assert(old_index >= 0 && old_index < length, "invalid method index");
2599 method_ordering->at_put(index, old_index);
2600 m->set_vtable_index(Method::invalid_vtable_index);
2601 }
2602 return method_ordering;
2603 } else {
2604 return Universe::the_empty_int_array();
2605 }
2606 }
2607
2608
2609 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, TRAPS) {
2610 ClassFileStream* cfs = stream();
2611 cfs->guarantee_more(2, CHECK); // sourcefile_index
2612 u2 sourcefile_index = cfs->get_u2_fast();
2613 check_property(
2614 valid_cp_range(sourcefile_index, cp->length()) &&
2615 cp->tag_at(sourcefile_index).is_utf8(),
2616 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2617 sourcefile_index, CHECK);
2618 set_class_sourcefile(cp->symbol_at(sourcefile_index));
2619 }
2620
2621
2622
2623 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2624 int length, TRAPS) {
2625 ClassFileStream* cfs = stream();
2626 u1* sde_buffer = cfs->get_u1_buffer();
2627 assert(sde_buffer != NULL, "null sde buffer");
2628
2629 // Don't bother storing it if there is no way to retrieve it
2630 if (JvmtiExport::can_get_source_debug_extension()) {
2631 assert((length+1) > length, "Overflow checking");
2632 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2633 for (int i = 0; i < length; i++) {
2634 sde[i] = sde_buffer[i];
2635 }
2636 sde[length] = '\0';
2637 set_class_sde_buffer((char*)sde, length);
2638 }
2639 // Got utf8 string, set stream position forward
2640 cfs->skip_u1(length, CHECK);
2641 }
2642
2643
2644 // Inner classes can be static, private or protected (classic VM does this)
2645 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2646
2647 // Return number of classes in the inner classes attribute table
2648 u2 ClassFileParser::parse_classfile_inner_classes_attribute(ClassLoaderData* loader_data,
2649 u1* inner_classes_attribute_start,
2650 bool parsed_enclosingmethod_attribute,
2651 u2 enclosing_method_class_index,
2652 u2 enclosing_method_method_index,
2653 constantPoolHandle cp,
2654 TRAPS) {
2655 ClassFileStream* cfs = stream();
2656 u1* current_mark = cfs->current();
2657 u2 length = 0;
2658 if (inner_classes_attribute_start != NULL) {
2659 cfs->set_current(inner_classes_attribute_start);
2660 cfs->guarantee_more(2, CHECK_0); // length
2661 length = cfs->get_u2_fast();
2662 }
2663
2664 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2665 // method data:
2666 // [inner_class_info_index,
2667 // outer_class_info_index,
2668 // inner_name_index,
2669 // inner_class_access_flags,
2670 // ...
2671 // enclosing_method_class_index,
2672 // enclosing_method_method_index]
2673 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2674 // FIXME: Will leak on exceptions.
2675 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(loader_data, size, CHECK_0);
2676 int index = 0;
2677 int cp_size = cp->length();
2678 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2679 for (int n = 0; n < length; n++) {
2680 // Inner class index
2681 u2 inner_class_info_index = cfs->get_u2_fast();
2682 check_property(
2683 inner_class_info_index == 0 ||
2684 (valid_cp_range(inner_class_info_index, cp_size) &&
2685 is_klass_reference(cp, inner_class_info_index)),
2686 "inner_class_info_index %u has bad constant type in class file %s",
2687 inner_class_info_index, CHECK_0);
2688 // Outer class index
2689 u2 outer_class_info_index = cfs->get_u2_fast();
2690 check_property(
2691 outer_class_info_index == 0 ||
2692 (valid_cp_range(outer_class_info_index, cp_size) &&
2693 is_klass_reference(cp, outer_class_info_index)),
2694 "outer_class_info_index %u has bad constant type in class file %s",
2695 outer_class_info_index, CHECK_0);
2696 // Inner class name
2697 u2 inner_name_index = cfs->get_u2_fast();
2698 check_property(
2699 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2700 cp->tag_at(inner_name_index).is_utf8()),
2701 "inner_name_index %u has bad constant type in class file %s",
2702 inner_name_index, CHECK_0);
2703 if (_need_verify) {
2704 guarantee_property(inner_class_info_index != outer_class_info_index,
2705 "Class is both outer and inner class in class file %s", CHECK_0);
2706 }
2707 // Access flags
2708 AccessFlags inner_access_flags;
2709 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2710 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2711 // Set abstract bit for old class files for backward compatibility
2712 flags |= JVM_ACC_ABSTRACT;
2713 }
2714 verify_legal_class_modifiers(flags, CHECK_0);
2715 inner_access_flags.set_flags(flags);
2716
2717 inner_classes->at_put(index++, inner_class_info_index);
2718 inner_classes->at_put(index++, outer_class_info_index);
2719 inner_classes->at_put(index++, inner_name_index);
2720 inner_classes->at_put(index++, inner_access_flags.as_short());
2721 }
2722
2723 // 4347400: make sure there's no duplicate entry in the classes array
2724 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2725 for(int i = 0; i < length * 4; i += 4) {
2726 for(int j = i + 4; j < length * 4; j += 4) {
2727 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2728 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2729 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2730 inner_classes->at(i+3) != inner_classes->at(j+3)),
2731 "Duplicate entry in InnerClasses in class file %s",
2732 CHECK_0);
2733 }
2734 }
2735 }
2736
2737 // Set EnclosingMethod class and method indexes.
2738 if (parsed_enclosingmethod_attribute) {
2739 inner_classes->at_put(index++, enclosing_method_class_index);
2740 inner_classes->at_put(index++, enclosing_method_method_index);
2741 }
2742 assert(index == size, "wrong size");
2743
2744 // Update InstanceKlass with inner class info.
2745 set_class_inner_classes(inner_classes);
2746
2747 // Restore buffer's current position.
2748 cfs->set_current(current_mark);
2749
2750 return length;
2751 }
2752
2753 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, TRAPS) {
2754 set_class_synthetic_flag(true);
2755 }
2756
2757 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, TRAPS) {
2758 ClassFileStream* cfs = stream();
2759 u2 signature_index = cfs->get_u2(CHECK);
2760 check_property(
2761 valid_cp_range(signature_index, cp->length()) &&
2762 cp->tag_at(signature_index).is_utf8(),
2763 "Invalid constant pool index %u in Signature attribute in class file %s",
2764 signature_index, CHECK);
2765 set_class_generic_signature(cp->symbol_at(signature_index));
2766 }
2767
2768 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(ClassLoaderData* loader_data,
2769 constantPoolHandle cp,
2770 u4 attribute_byte_length, TRAPS) {
2771 ClassFileStream* cfs = stream();
2772 u1* current_start = cfs->current();
2773
2774 cfs->guarantee_more(2, CHECK); // length
2775 int attribute_array_length = cfs->get_u2_fast();
2776
2777 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2778 "Short length on BootstrapMethods in class file %s",
2779 CHECK);
2780
2781 // The attribute contains a counted array of counted tuples of shorts,
2782 // represending bootstrap specifiers:
2783 // length*{bootstrap_method_index, argument_count*{argument_index}}
2784 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2785 // operand_count = number of shorts in attr, except for leading length
2786
2787 // The attribute is copied into a short[] array.
2788 // The array begins with a series of short[2] pairs, one for each tuple.
2789 int index_size = (attribute_array_length * 2);
2790
2791 Array<u2>* operands = MetadataFactory::new_array<u2>(loader_data, index_size + operand_count, CHECK);
2792
2793 int operand_fill_index = index_size;
2794 int cp_size = cp->length();
2795
2796 for (int n = 0; n < attribute_array_length; n++) {
2797 // Store a 32-bit offset into the header of the operand array.
2798 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2799
2800 // Read a bootstrap specifier.
2801 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2802 u2 bootstrap_method_index = cfs->get_u2_fast();
2803 u2 argument_count = cfs->get_u2_fast();
2804 check_property(
2805 valid_cp_range(bootstrap_method_index, cp_size) &&
2806 cp->tag_at(bootstrap_method_index).is_method_handle(),
2807 "bootstrap_method_index %u has bad constant type in class file %s",
2808 bootstrap_method_index,
2809 CHECK);
2810 operands->at_put(operand_fill_index++, bootstrap_method_index);
2811 operands->at_put(operand_fill_index++, argument_count);
2812
2813 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2814 for (int j = 0; j < argument_count; j++) {
2815 u2 argument_index = cfs->get_u2_fast();
2816 check_property(
2817 valid_cp_range(argument_index, cp_size) &&
2818 cp->tag_at(argument_index).is_loadable_constant(),
2819 "argument_index %u has bad constant type in class file %s",
2820 argument_index,
2821 CHECK);
2822 operands->at_put(operand_fill_index++, argument_index);
2823 }
2824 }
2825
2826 assert(operand_fill_index == operands->length(), "exact fill");
2827 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2828
2829 u1* current_end = cfs->current();
2830 guarantee_property(current_end == current_start + attribute_byte_length,
2831 "Bad length on BootstrapMethods in class file %s",
2832 CHECK);
2833
2834 cp->set_operands(operands);
2835 }
2836
2837 void ClassFileParser::parse_classfile_attributes(ClassLoaderData* loader_data,
2838 constantPoolHandle cp,
2839 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2840 TRAPS) {
2841 ClassFileStream* cfs = stream();
2842 // Set inner classes attribute to default sentinel
2843 set_class_inner_classes(Universe::the_empty_short_array());
2844 cfs->guarantee_more(2, CHECK); // attributes_count
2845 u2 attributes_count = cfs->get_u2_fast();
2846 bool parsed_sourcefile_attribute = false;
2847 bool parsed_innerclasses_attribute = false;
2848 bool parsed_enclosingmethod_attribute = false;
2849 bool parsed_bootstrap_methods_attribute = false;
2850 u1* runtime_visible_annotations = NULL;
2851 int runtime_visible_annotations_length = 0;
2852 u1* runtime_invisible_annotations = NULL;
2853 int runtime_invisible_annotations_length = 0;
2854 u1* runtime_visible_type_annotations = NULL;
2855 int runtime_visible_type_annotations_length = 0;
2856 u1* runtime_invisible_type_annotations = NULL;
2857 int runtime_invisible_type_annotations_length = 0;
2858 u1* inner_classes_attribute_start = NULL;
2859 u4 inner_classes_attribute_length = 0;
2860 u2 enclosing_method_class_index = 0;
2861 u2 enclosing_method_method_index = 0;
2862 // Iterate over attributes
2863 while (attributes_count--) {
2864 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2865 u2 attribute_name_index = cfs->get_u2_fast();
2866 u4 attribute_length = cfs->get_u4_fast();
2867 check_property(
2868 valid_cp_range(attribute_name_index, cp->length()) &&
2869 cp->tag_at(attribute_name_index).is_utf8(),
2870 "Attribute name has bad constant pool index %u in class file %s",
2871 attribute_name_index, CHECK);
2872 Symbol* tag = cp->symbol_at(attribute_name_index);
2873 if (tag == vmSymbols::tag_source_file()) {
2874 // Check for SourceFile tag
2875 if (_need_verify) {
2876 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2877 }
2878 if (parsed_sourcefile_attribute) {
2879 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2880 } else {
2881 parsed_sourcefile_attribute = true;
2882 }
2883 parse_classfile_sourcefile_attribute(cp, CHECK);
2884 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2885 // Check for SourceDebugExtension tag
2886 parse_classfile_source_debug_extension_attribute(cp, (int)attribute_length, CHECK);
2887 } else if (tag == vmSymbols::tag_inner_classes()) {
2888 // Check for InnerClasses tag
2889 if (parsed_innerclasses_attribute) {
2890 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2891 } else {
2892 parsed_innerclasses_attribute = true;
2893 }
2894 inner_classes_attribute_start = cfs->get_u1_buffer();
2895 inner_classes_attribute_length = attribute_length;
2896 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2897 } else if (tag == vmSymbols::tag_synthetic()) {
2898 // Check for Synthetic tag
2899 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2900 if (attribute_length != 0) {
2901 classfile_parse_error(
2902 "Invalid Synthetic classfile attribute length %u in class file %s",
2903 attribute_length, CHECK);
2904 }
2905 parse_classfile_synthetic_attribute(cp, CHECK);
2906 } else if (tag == vmSymbols::tag_deprecated()) {
2907 // Check for Deprecatd tag - 4276120
2908 if (attribute_length != 0) {
2909 classfile_parse_error(
2910 "Invalid Deprecated classfile attribute length %u in class file %s",
2911 attribute_length, CHECK);
2912 }
2913 } else if (_major_version >= JAVA_1_5_VERSION) {
2914 if (tag == vmSymbols::tag_signature()) {
2915 if (attribute_length != 2) {
2916 classfile_parse_error(
2917 "Wrong Signature attribute length %u in class file %s",
2918 attribute_length, CHECK);
2919 }
2920 parse_classfile_signature_attribute(cp, CHECK);
2921 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2922 runtime_visible_annotations_length = attribute_length;
2923 runtime_visible_annotations = cfs->get_u1_buffer();
2924 assert(runtime_visible_annotations != NULL, "null visible annotations");
2925 parse_annotations(loader_data,
2926 runtime_visible_annotations,
2927 runtime_visible_annotations_length,
2928 cp,
2929 parsed_annotations,
2930 CHECK);
2931 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2932 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2933 runtime_invisible_annotations_length = attribute_length;
2934 runtime_invisible_annotations = cfs->get_u1_buffer();
2935 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2936 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2937 } else if (tag == vmSymbols::tag_enclosing_method()) {
2938 if (parsed_enclosingmethod_attribute) {
2939 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2940 } else {
2941 parsed_enclosingmethod_attribute = true;
2942 }
2943 cfs->guarantee_more(4, CHECK); // class_index, method_index
2944 enclosing_method_class_index = cfs->get_u2_fast();
2945 enclosing_method_method_index = cfs->get_u2_fast();
2946 if (enclosing_method_class_index == 0) {
2947 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2948 }
2949 // Validate the constant pool indices and types
2950 if (!cp->is_within_bounds(enclosing_method_class_index) ||
2951 !is_klass_reference(cp, enclosing_method_class_index)) {
2952 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2953 }
2954 if (enclosing_method_method_index != 0 &&
2955 (!cp->is_within_bounds(enclosing_method_method_index) ||
2956 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2957 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2958 }
2959 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2960 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2961 if (parsed_bootstrap_methods_attribute)
2962 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2963 parsed_bootstrap_methods_attribute = true;
2964 parse_classfile_bootstrap_methods_attribute(loader_data, cp, attribute_length, CHECK);
2965 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2966 runtime_visible_type_annotations_length = attribute_length;
2967 runtime_visible_type_annotations = cfs->get_u1_buffer();
2968 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2969 // No need for the VM to parse Type annotations
2970 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2971 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2972 runtime_invisible_type_annotations_length = attribute_length;
2973 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2974 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2975 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2976 } else {
2977 // Unknown attribute
2978 cfs->skip_u1(attribute_length, CHECK);
2979 }
2980 } else {
2981 // Unknown attribute
2982 cfs->skip_u1(attribute_length, CHECK);
2983 }
2984 }
2985 AnnotationArray* annotations = assemble_annotations(loader_data,
2986 runtime_visible_annotations,
2987 runtime_visible_annotations_length,
2988 runtime_invisible_annotations,
2989 runtime_invisible_annotations_length,
2990 CHECK);
2991 set_class_annotations(annotations);
2992 AnnotationArray* type_annotations = assemble_annotations(loader_data,
2993 runtime_visible_type_annotations,
2994 runtime_visible_type_annotations_length,
2995 runtime_invisible_type_annotations,
2996 runtime_invisible_type_annotations_length,
2997 CHECK);
2998 set_class_type_annotations(type_annotations);
2999
3000 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3001 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3002 loader_data,
3003 inner_classes_attribute_start,
3004 parsed_innerclasses_attribute,
3005 enclosing_method_class_index,
3006 enclosing_method_method_index,
3007 cp, CHECK);
3008 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3009 guarantee_property(
3010 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3011 "Wrong InnerClasses attribute length in class file %s", CHECK);
3012 }
3013 }
3014
3015 if (_max_bootstrap_specifier_index >= 0) {
3016 guarantee_property(parsed_bootstrap_methods_attribute,
3017 "Missing BootstrapMethods attribute in class file %s", CHECK);
3018 }
3019 }
3020
3021 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3022 if (_synthetic_flag)
3023 k->set_is_synthetic();
3024 if (_sourcefile != NULL) {
3025 _sourcefile->increment_refcount();
3026 k->set_source_file_name(_sourcefile);
3027 }
3028 if (_generic_signature != NULL) {
3029 _generic_signature->increment_refcount();
3030 k->set_generic_signature(_generic_signature);
3031 }
3032 if (_sde_buffer != NULL) {
3033 k->set_source_debug_extension(_sde_buffer, _sde_length);
3034 }
3035 k->set_inner_classes(_inner_classes);
3036 if (_annotations != NULL) {
3037 k->annotations()->set_class_annotations(_annotations);
3038 }
3039 }
3040
3041 AnnotationArray* ClassFileParser::assemble_annotations(ClassLoaderData* loader_data,
3042 u1* runtime_visible_annotations,
3043 int runtime_visible_annotations_length,
3044 u1* runtime_invisible_annotations,
3045 int runtime_invisible_annotations_length, TRAPS) {
3046 AnnotationArray* annotations = NULL;
3047 if (runtime_visible_annotations != NULL ||
3048 runtime_invisible_annotations != NULL) {
3049 annotations = MetadataFactory::new_array<u1>(loader_data,
3050 runtime_visible_annotations_length +
3051 runtime_invisible_annotations_length,
3052 CHECK_(annotations));
3053 if (runtime_visible_annotations != NULL) {
3054 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3055 annotations->at_put(i, runtime_visible_annotations[i]);
3056 }
3057 }
3058 if (runtime_invisible_annotations != NULL) {
3059 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3060 int append = runtime_visible_annotations_length+i;
3061 annotations->at_put(append, runtime_invisible_annotations[i]);
3062 }
3063 }
3064 }
3065 return annotations;
3066 }
3067
3068
3069 #ifndef PRODUCT
3070 static void parseAndPrintGenericSignatures(
3071 instanceKlassHandle this_klass, TRAPS) {
3072 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3073 ResourceMark rm;
3074
3075 if (this_klass->generic_signature() != NULL) {
3076 using namespace generic;
3077 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3078
3079 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3080 spec->print_on(tty);
3081
3082 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3083 Method* m = this_klass->methods()->at(i);
3084 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3085 Symbol* sig = m->generic_signature();
3086 if (sig == NULL) {
3087 sig = m->signature();
3088 }
3089 tty->print_cr("Parsing %s", sig->as_C_string());
3090 method_spec->print_on(tty);
3091 }
3092 }
3093 }
3094 #endif // ndef PRODUCT
3095
3096
3097 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3098 ClassLoaderData* loader_data,
3099 Handle protection_domain,
3100 KlassHandle host_klass,
3101 GrowableArray<Handle>* cp_patches,
3102 TempNewSymbol& parsed_name,
3103 bool verify,
3104 TRAPS) {
3105
3106 // When a retransformable agent is attached, JVMTI caches the
3107 // class bytes that existed before the first retransformation.
3108 // If RedefineClasses() was used before the retransformable
3109 // agent attached, then the cached class bytes may not be the
3110 // original class bytes.
3111 unsigned char *cached_class_file_bytes = NULL;
3112 jint cached_class_file_length;
3113 Handle class_loader(THREAD, loader_data->class_loader());
3114 bool has_default_methods = false;
3115 ResourceMark rm(THREAD);
3116
3117 ClassFileStream* cfs = stream();
3118 // Timing
3119 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3120 JavaThread* jt = (JavaThread*) THREAD;
3121
3122 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3123 ClassLoader::perf_class_parse_selftime(),
3124 NULL,
3125 jt->get_thread_stat()->perf_recursion_counts_addr(),
3126 jt->get_thread_stat()->perf_timers_addr(),
3127 PerfClassTraceTime::PARSE_CLASS);
3128
3129 init_parsed_class_attributes();
3130
3131 if (JvmtiExport::should_post_class_file_load_hook()) {
3132 // Get the cached class file bytes (if any) from the class that
3133 // is being redefined or retransformed. We use jvmti_thread_state()
3134 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3135 // a JvmtiThreadState any earlier than necessary. This will help
3136 // avoid the bug described by 7126851.
3137 JvmtiThreadState *state = jt->jvmti_thread_state();
3138 if (state != NULL) {
3139 KlassHandle *h_class_being_redefined =
3140 state->get_class_being_redefined();
3141 if (h_class_being_redefined != NULL) {
3142 instanceKlassHandle ikh_class_being_redefined =
3143 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3144 cached_class_file_bytes =
3145 ikh_class_being_redefined->get_cached_class_file_bytes();
3146 cached_class_file_length =
3147 ikh_class_being_redefined->get_cached_class_file_len();
3148 }
3149 }
3150
3151 unsigned char* ptr = cfs->buffer();
3152 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3153
3154 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3155 &ptr, &end_ptr,
3156 &cached_class_file_bytes,
3157 &cached_class_file_length);
3158
3159 if (ptr != cfs->buffer()) {
3160 // JVMTI agent has modified class file data.
3161 // Set new class file stream using JVMTI agent modified
3162 // class file data.
3163 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3164 set_stream(cfs);
3165 }
3166 }
3167
3168 _host_klass = host_klass;
3169 _cp_patches = cp_patches;
3170
3171 instanceKlassHandle nullHandle;
3172
3173 // Figure out whether we can skip format checking (matching classic VM behavior)
3174 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3175
3176 // Set the verify flag in stream
3177 cfs->set_verify(_need_verify);
3178
3179 // Save the class file name for easier error message printing.
3180 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3181
3182 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3183 // Magic value
3184 u4 magic = cfs->get_u4_fast();
3185 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3186 "Incompatible magic value %u in class file %s",
3187 magic, CHECK_(nullHandle));
3188
3189 // Version numbers
3190 u2 minor_version = cfs->get_u2_fast();
3191 u2 major_version = cfs->get_u2_fast();
3192
3193 // Check version numbers - we check this even with verifier off
3194 if (!is_supported_version(major_version, minor_version)) {
3195 if (name == NULL) {
3196 Exceptions::fthrow(
3197 THREAD_AND_LOCATION,
3198 vmSymbols::java_lang_UnsupportedClassVersionError(),
3199 "Unsupported major.minor version %u.%u",
3200 major_version,
3201 minor_version);
3202 } else {
3203 ResourceMark rm(THREAD);
3204 Exceptions::fthrow(
3205 THREAD_AND_LOCATION,
3206 vmSymbols::java_lang_UnsupportedClassVersionError(),
3207 "%s : Unsupported major.minor version %u.%u",
3208 name->as_C_string(),
3209 major_version,
3210 minor_version);
3211 }
3212 return nullHandle;
3213 }
3214
3215 _major_version = major_version;
3216 _minor_version = minor_version;
3217
3218
3219 // Check if verification needs to be relaxed for this class file
3220 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3221 _relax_verify = Verifier::relax_verify_for(class_loader());
3222
3223 // Constant pool
3224 constantPoolHandle cp = parse_constant_pool(loader_data, CHECK_(nullHandle));
3225 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
3226
3227 int cp_size = cp->length();
3228
3229 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3230
3231 // Access flags
3232 AccessFlags access_flags;
3233 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3234
3235 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3236 // Set abstract bit for old class files for backward compatibility
3237 flags |= JVM_ACC_ABSTRACT;
3238 }
3239 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3240 access_flags.set_flags(flags);
3241
3242 // This class and superclass
3243 instanceKlassHandle super_klass;
3244 u2 this_class_index = cfs->get_u2_fast();
3245 check_property(
3246 valid_cp_range(this_class_index, cp_size) &&
3247 cp->tag_at(this_class_index).is_unresolved_klass(),
3248 "Invalid this class index %u in constant pool in class file %s",
3249 this_class_index, CHECK_(nullHandle));
3250
3251 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3252 assert(class_name != NULL, "class_name can't be null");
3253
3254 // It's important to set parsed_name *before* resolving the super class.
3255 // (it's used for cleanup by the caller if parsing fails)
3256 parsed_name = class_name;
3257 // parsed_name is returned and can be used if there's an error, so add to
3258 // its reference count. Caller will decrement the refcount.
3259 parsed_name->increment_refcount();
3260
3261 // Update _class_name which could be null previously to be class_name
3262 _class_name = class_name;
3263
3264 // Don't need to check whether this class name is legal or not.
3265 // It has been checked when constant pool is parsed.
3266 // However, make sure it is not an array type.
3267 if (_need_verify) {
3268 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3269 "Bad class name in class file %s",
3270 CHECK_(nullHandle));
3271 }
3272
3273 Klass* preserve_this_klass; // for storing result across HandleMark
3274
3275 // release all handles when parsing is done
3276 { HandleMark hm(THREAD);
3277
3278 // Checks if name in class file matches requested name
3279 if (name != NULL && class_name != name) {
3280 ResourceMark rm(THREAD);
3281 Exceptions::fthrow(
3282 THREAD_AND_LOCATION,
3283 vmSymbols::java_lang_NoClassDefFoundError(),
3284 "%s (wrong name: %s)",
3285 name->as_C_string(),
3286 class_name->as_C_string()
3287 );
3288 return nullHandle;
3289 }
3290
3291 if (TraceClassLoadingPreorder) {
3292 tty->print("[Loading %s", name->as_klass_external_name());
3293 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3294 tty->print_cr("]");
3295 }
3296
3297 u2 super_class_index = cfs->get_u2_fast();
3298 if (super_class_index == 0) {
3299 check_property(class_name == vmSymbols::java_lang_Object(),
3300 "Invalid superclass index %u in class file %s",
3301 super_class_index,
3302 CHECK_(nullHandle));
3303 } else {
3304 check_property(valid_cp_range(super_class_index, cp_size) &&
3305 is_klass_reference(cp, super_class_index),
3306 "Invalid superclass index %u in class file %s",
3307 super_class_index,
3308 CHECK_(nullHandle));
3309 // The class name should be legal because it is checked when parsing constant pool.
3310 // However, make sure it is not an array type.
3311 bool is_array = false;
3312 if (cp->tag_at(super_class_index).is_klass()) {
3313 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3314 if (_need_verify)
3315 is_array = super_klass->oop_is_array();
3316 } else if (_need_verify) {
3317 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3318 }
3319 if (_need_verify) {
3320 guarantee_property(!is_array,
3321 "Bad superclass name in class file %s", CHECK_(nullHandle));
3322 }
3323 }
3324
3325 // Interfaces
3326 u2 itfs_len = cfs->get_u2_fast();
3327 Array<Klass*>* local_interfaces;
3328 if (itfs_len == 0) {
3329 local_interfaces = Universe::the_empty_klass_array();
3330 } else {
3331 local_interfaces = parse_interfaces(
3332 cp, itfs_len, loader_data, protection_domain, _class_name,
3333 &has_default_methods, CHECK_(nullHandle));
3334 }
3335
3336 u2 java_fields_count = 0;
3337 // Fields (offsets are filled in later)
3338 FieldAllocationCount fac;
3339 Array<AnnotationArray*>* fields_annotations = NULL;
3340 Array<AnnotationArray*>* fields_type_annotations = NULL;
3341 Array<u2>* fields = parse_fields(loader_data, class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
3342 &fields_type_annotations,
3343 &java_fields_count,
3344 CHECK_(nullHandle));
3345 // Methods
3346 bool has_final_method = false;
3347 AccessFlags promoted_flags;
3348 promoted_flags.set_flags(0);
3349
3350 Array<AnnotationArray*>* methods_annotations = NULL;
3351 Array<AnnotationArray*>* methods_parameter_annotations = NULL;
3352 Array<AnnotationArray*>* methods_default_annotations = NULL;
3353 Array<AnnotationArray*>* methods_type_annotations = NULL;
3354 Array<Method*>* methods = parse_methods(loader_data,
3355 cp, access_flags.is_interface(),
3356 &promoted_flags,
3357 &has_final_method,
3358 &methods_annotations,
3359 &methods_parameter_annotations,
3360 &methods_default_annotations,
3361 &methods_type_annotations,
3362 &has_default_methods,
3363 CHECK_(nullHandle));
3364
3365 // Additional attributes
3366 ClassAnnotationCollector parsed_annotations;
3367 parse_classfile_attributes(loader_data, cp, &parsed_annotations, CHECK_(nullHandle));
3368
3369 // Make sure this is the end of class file stream
3370 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3371
3372 // We check super class after class file is parsed and format is checked
3373 if (super_class_index > 0 && super_klass.is_null()) {
3374 Symbol* sk = cp->klass_name_at(super_class_index);
3375 if (access_flags.is_interface()) {
3376 // Before attempting to resolve the superclass, check for class format
3377 // errors not checked yet.
3378 guarantee_property(sk == vmSymbols::java_lang_Object(),
3379 "Interfaces must have java.lang.Object as superclass in class file %s",
3380 CHECK_(nullHandle));
3381 }
3382 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3383 class_loader,
3384 protection_domain,
3385 true,
3386 CHECK_(nullHandle));
3387
3388 KlassHandle kh (THREAD, k);
3389 super_klass = instanceKlassHandle(THREAD, kh());
3390 }
3391 if (super_klass.not_null()) {
3392
3393 if (super_klass->has_default_methods()) {
3394 has_default_methods = true;
3395 }
3396
3397 if (super_klass->is_interface()) {
3398 ResourceMark rm(THREAD);
3399 Exceptions::fthrow(
3400 THREAD_AND_LOCATION,
3401 vmSymbols::java_lang_IncompatibleClassChangeError(),
3402 "class %s has interface %s as super class",
3403 class_name->as_klass_external_name(),
3404 super_klass->external_name()
3405 );
3406 return nullHandle;
3407 }
3408 // Make sure super class is not final
3409 if (super_klass->is_final()) {
3410 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3411 }
3412 }
3413
3414 // Compute the transitive list of all unique interfaces implemented by this class
3415 Array<Klass*>* transitive_interfaces = compute_transitive_interfaces(loader_data, super_klass, local_interfaces, CHECK_(nullHandle));
3416
3417 // sort methods
3418 Array<int>* method_ordering = sort_methods(loader_data,
3419 methods,
3420 methods_annotations,
3421 methods_parameter_annotations,
3422 methods_default_annotations,
3423 methods_type_annotations,
3424 CHECK_(nullHandle));
3425
3426 // promote flags from parse_methods() to the klass' flags
3427 access_flags.add_promoted_flags(promoted_flags.as_int());
3428
3429 // Size of Java vtable (in words)
3430 int vtable_size = 0;
3431 int itable_size = 0;
3432 int num_miranda_methods = 0;
3433
3434 GrowableArray<Method*> all_mirandas(20);
3435
3436 klassVtable::compute_vtable_size_and_num_mirandas(
3437 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3438 access_flags, class_loader, class_name, local_interfaces,
3439 CHECK_(nullHandle));
3440
3441 // Size of Java itable (in words)
3442 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3443
3444 // get the padding width from the option
3445 // TODO: Ask VM about specific CPU we are running on
3446 int pad_size = ContendedPaddingWidth;
3447
3448 // Field size and offset computation
3449 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3450 #ifndef PRODUCT
3451 int orig_nonstatic_field_size = 0;
3452 #endif
3453 int next_static_oop_offset;
3454 int next_static_double_offset;
3455 int next_static_word_offset;
3456 int next_static_short_offset;
3457 int next_static_byte_offset;
3458 int next_static_padded_offset;
3459 int next_nonstatic_oop_offset;
3460 int next_nonstatic_double_offset;
3461 int next_nonstatic_word_offset;
3462 int next_nonstatic_short_offset;
3463 int next_nonstatic_byte_offset;
3464 int next_nonstatic_type_offset;
3465 int first_nonstatic_oop_offset;
3466 int first_nonstatic_field_offset;
3467 int next_nonstatic_field_offset;
3468 int next_nonstatic_padded_offset;
3469
3470 // Count the contended fields by type.
3471 int static_contended_count = 0;
3472 int nonstatic_contended_count = 0;
3473 FieldAllocationCount fac_contended;
3474 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3475 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3476 if (fs.is_contended()) {
3477 fac_contended.count[atype]++;
3478 if (fs.access_flags().is_static()) {
3479 static_contended_count++;
3480 } else {
3481 nonstatic_contended_count++;
3482 }
3483 }
3484 }
3485 int contended_count = static_contended_count + nonstatic_contended_count;
3486
3487
3488 // Calculate the starting byte offsets
3489 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3490
3491 // class is contended, pad before all the fields
3492 if (parsed_annotations.is_contended()) {
3493 next_static_oop_offset += pad_size;
3494 }
3495
3496 next_static_double_offset = next_static_oop_offset +
3497 ((fac.count[STATIC_OOP] - fac_contended.count[STATIC_OOP]) * heapOopSize);
3498 if ( fac.count[STATIC_DOUBLE] &&
3499 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3500 Universe::field_type_should_be_aligned(T_LONG)) ) {
3501 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3502 }
3503
3504 next_static_word_offset = next_static_double_offset +
3505 ((fac.count[STATIC_DOUBLE] - fac_contended.count[STATIC_DOUBLE]) * BytesPerLong);
3506 next_static_short_offset = next_static_word_offset +
3507 ((fac.count[STATIC_WORD] - fac_contended.count[STATIC_WORD]) * BytesPerInt);
3508 next_static_byte_offset = next_static_short_offset +
3509 ((fac.count[STATIC_SHORT] - fac_contended.count[STATIC_SHORT]) * BytesPerShort);
3510 next_static_padded_offset = next_static_byte_offset +
3511 ((fac.count[STATIC_BYTE] - fac_contended.count[STATIC_BYTE]) * 1);
3512
3513 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3514 nonstatic_field_size * heapOopSize;
3515
3516 // class is contended, pad before all the fields
3517 if (parsed_annotations.is_contended()) {
3518 first_nonstatic_field_offset += pad_size;
3519 }
3520
3521 next_nonstatic_field_offset = first_nonstatic_field_offset;
3522
3523 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3524 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3525 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3526 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3527 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3528
3529 bool super_has_nonstatic_fields =
3530 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3531 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3532 ((nonstatic_double_count + nonstatic_word_count +
3533 nonstatic_short_count + nonstatic_byte_count +
3534 nonstatic_oop_count) != 0);
3535
3536
3537 // Prepare list of oops for oop map generation.
3538 int* nonstatic_oop_offsets;
3539 unsigned int* nonstatic_oop_counts;
3540 unsigned int nonstatic_oop_map_count = 0;
3541
3542 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3543 THREAD, int, nonstatic_oop_count + 1);
3544 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3545 THREAD, unsigned int, nonstatic_oop_count + 1);
3546
3547 first_nonstatic_oop_offset = 0; // will be set for first oop field
3548
3549 #ifndef PRODUCT
3550 if( PrintCompactFieldsSavings ) {
3551 next_nonstatic_double_offset = next_nonstatic_field_offset +
3552 (nonstatic_oop_count * heapOopSize);
3553 if ( nonstatic_double_count > 0 ) {
3554 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3555 }
3556 next_nonstatic_word_offset = next_nonstatic_double_offset +
3557 (nonstatic_double_count * BytesPerLong);
3558 next_nonstatic_short_offset = next_nonstatic_word_offset +
3559 (nonstatic_word_count * BytesPerInt);
3560 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3561 (nonstatic_short_count * BytesPerShort);
3562 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3563 nonstatic_byte_count ), heapOopSize );
3564 orig_nonstatic_field_size = nonstatic_field_size +
3565 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3566 }
3567 #endif
3568 bool compact_fields = CompactFields;
3569 int allocation_style = FieldsAllocationStyle;
3570 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3571 assert(false, "0 <= FieldsAllocationStyle <= 2");
3572 allocation_style = 1; // Optimistic
3573 }
3574
3575 // The next classes have predefined hard-coded fields offsets
3576 // (see in JavaClasses::compute_hard_coded_offsets()).
3577 // Use default fields allocation order for them.
3578 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3579 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3580 class_name == vmSymbols::java_lang_Class() ||
3581 class_name == vmSymbols::java_lang_ClassLoader() ||
3582 class_name == vmSymbols::java_lang_ref_Reference() ||
3583 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3584 class_name == vmSymbols::java_lang_StackTraceElement() ||
3585 class_name == vmSymbols::java_lang_String() ||
3586 class_name == vmSymbols::java_lang_Throwable() ||
3587 class_name == vmSymbols::java_lang_Boolean() ||
3588 class_name == vmSymbols::java_lang_Character() ||
3589 class_name == vmSymbols::java_lang_Float() ||
3590 class_name == vmSymbols::java_lang_Double() ||
3591 class_name == vmSymbols::java_lang_Byte() ||
3592 class_name == vmSymbols::java_lang_Short() ||
3593 class_name == vmSymbols::java_lang_Integer() ||
3594 class_name == vmSymbols::java_lang_Long())) {
3595 allocation_style = 0; // Allocate oops first
3596 compact_fields = false; // Don't compact fields
3597 }
3598
3599 if( allocation_style == 0 ) {
3600 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3601 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3602 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3603 (nonstatic_oop_count * heapOopSize);
3604 } else if( allocation_style == 1 ) {
3605 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3606 next_nonstatic_double_offset = next_nonstatic_field_offset;
3607 } else if( allocation_style == 2 ) {
3608 // Fields allocation: oops fields in super and sub classes are together.
3609 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3610 super_klass->nonstatic_oop_map_size() > 0 ) {
3611 int map_count = super_klass->nonstatic_oop_map_count();
3612 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3613 OopMapBlock* last_map = first_map + map_count - 1;
3614 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3615 if (next_offset == next_nonstatic_field_offset) {
3616 allocation_style = 0; // allocate oops first
3617 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3618 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3619 (nonstatic_oop_count * heapOopSize);
3620 }
3621 }
3622 if( allocation_style == 2 ) {
3623 allocation_style = 1; // allocate oops last
3624 next_nonstatic_double_offset = next_nonstatic_field_offset;
3625 }
3626 } else {
3627 ShouldNotReachHere();
3628 }
3629
3630 int nonstatic_oop_space_count = 0;
3631 int nonstatic_word_space_count = 0;
3632 int nonstatic_short_space_count = 0;
3633 int nonstatic_byte_space_count = 0;
3634 int nonstatic_oop_space_offset;
3635 int nonstatic_word_space_offset;
3636 int nonstatic_short_space_offset;
3637 int nonstatic_byte_space_offset;
3638
3639 if( nonstatic_double_count > 0 ) {
3640 int offset = next_nonstatic_double_offset;
3641 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3642 if( compact_fields && offset != next_nonstatic_double_offset ) {
3643 // Allocate available fields into the gap before double field.
3644 int length = next_nonstatic_double_offset - offset;
3645 assert(length == BytesPerInt, "");
3646 nonstatic_word_space_offset = offset;
3647 if( nonstatic_word_count > 0 ) {
3648 nonstatic_word_count -= 1;
3649 nonstatic_word_space_count = 1; // Only one will fit
3650 length -= BytesPerInt;
3651 offset += BytesPerInt;
3652 }
3653 nonstatic_short_space_offset = offset;
3654 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3655 nonstatic_short_count -= 1;
3656 nonstatic_short_space_count += 1;
3657 length -= BytesPerShort;
3658 offset += BytesPerShort;
3659 }
3660 nonstatic_byte_space_offset = offset;
3661 while( length > 0 && nonstatic_byte_count > 0 ) {
3662 nonstatic_byte_count -= 1;
3663 nonstatic_byte_space_count += 1;
3664 length -= 1;
3665 }
3666 // Allocate oop field in the gap if there are no other fields for that.
3667 nonstatic_oop_space_offset = offset;
3668 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3669 allocation_style != 0 ) { // when oop fields not first
3670 nonstatic_oop_count -= 1;
3671 nonstatic_oop_space_count = 1; // Only one will fit
3672 length -= heapOopSize;
3673 offset += heapOopSize;
3674 }
3675 }
3676 }
3677
3678 next_nonstatic_word_offset = next_nonstatic_double_offset +
3679 (nonstatic_double_count * BytesPerLong);
3680 next_nonstatic_short_offset = next_nonstatic_word_offset +
3681 (nonstatic_word_count * BytesPerInt);
3682 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3683 (nonstatic_short_count * BytesPerShort);
3684 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3685 nonstatic_byte_count;
3686
3687 // let oops jump before padding with this allocation style
3688 if( allocation_style == 1 ) {
3689 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3690 if( nonstatic_oop_count > 0 ) {
3691 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3692 }
3693 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3694 }
3695
3696 // Iterate over fields again and compute correct offsets.
3697 // The field allocation type was temporarily stored in the offset slot.
3698 // oop fields are located before non-oop fields (static and non-static).
3699 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3700
3701 // skip already laid out fields
3702 if (fs.is_offset_set()) continue;
3703
3704 // contended fields are handled below
3705 if (fs.is_contended()) continue;
3706
3707 int real_offset;
3708 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3709
3710 // pack the rest of the fields
3711 switch (atype) {
3712 case STATIC_OOP:
3713 real_offset = next_static_oop_offset;
3714 next_static_oop_offset += heapOopSize;
3715 break;
3716 case STATIC_BYTE:
3717 real_offset = next_static_byte_offset;
3718 next_static_byte_offset += 1;
3719 break;
3720 case STATIC_SHORT:
3721 real_offset = next_static_short_offset;
3722 next_static_short_offset += BytesPerShort;
3723 break;
3724 case STATIC_WORD:
3725 real_offset = next_static_word_offset;
3726 next_static_word_offset += BytesPerInt;
3727 break;
3728 case STATIC_DOUBLE:
3729 real_offset = next_static_double_offset;
3730 next_static_double_offset += BytesPerLong;
3731 break;
3732 case NONSTATIC_OOP:
3733 if( nonstatic_oop_space_count > 0 ) {
3734 real_offset = nonstatic_oop_space_offset;
3735 nonstatic_oop_space_offset += heapOopSize;
3736 nonstatic_oop_space_count -= 1;
3737 } else {
3738 real_offset = next_nonstatic_oop_offset;
3739 next_nonstatic_oop_offset += heapOopSize;
3740 }
3741 // Update oop maps
3742 if( nonstatic_oop_map_count > 0 &&
3743 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3744 real_offset -
3745 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3746 heapOopSize ) {
3747 // Extend current oop map
3748 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3749 } else {
3750 // Create new oop map
3751 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3752 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3753 nonstatic_oop_map_count += 1;
3754 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3755 first_nonstatic_oop_offset = real_offset;
3756 }
3757 }
3758 break;
3759 case NONSTATIC_BYTE:
3760 if( nonstatic_byte_space_count > 0 ) {
3761 real_offset = nonstatic_byte_space_offset;
3762 nonstatic_byte_space_offset += 1;
3763 nonstatic_byte_space_count -= 1;
3764 } else {
3765 real_offset = next_nonstatic_byte_offset;
3766 next_nonstatic_byte_offset += 1;
3767 }
3768 break;
3769 case NONSTATIC_SHORT:
3770 if( nonstatic_short_space_count > 0 ) {
3771 real_offset = nonstatic_short_space_offset;
3772 nonstatic_short_space_offset += BytesPerShort;
3773 nonstatic_short_space_count -= 1;
3774 } else {
3775 real_offset = next_nonstatic_short_offset;
3776 next_nonstatic_short_offset += BytesPerShort;
3777 }
3778 break;
3779 case NONSTATIC_WORD:
3780 if( nonstatic_word_space_count > 0 ) {
3781 real_offset = nonstatic_word_space_offset;
3782 nonstatic_word_space_offset += BytesPerInt;
3783 nonstatic_word_space_count -= 1;
3784 } else {
3785 real_offset = next_nonstatic_word_offset;
3786 next_nonstatic_word_offset += BytesPerInt;
3787 }
3788 break;
3789 case NONSTATIC_DOUBLE:
3790 real_offset = next_nonstatic_double_offset;
3791 next_nonstatic_double_offset += BytesPerLong;
3792 break;
3793 default:
3794 ShouldNotReachHere();
3795 }
3796 fs.set_offset(real_offset);
3797 }
3798
3799
3800 // Handle the contended cases.
3801 //
3802 // Each contended field should not intersect the cache line with another contended field.
3803 // In the absence of alignment information, we end up with pessimistically separating
3804 // the fields with full-width padding.
3805 //
3806 // Additionally, this should not break alignment for the fields, so we round the alignment up
3807 // for each field.
3808 if (contended_count > 0) {
3809
3810 // if there is at least one contended field, we need to have pre-padding for them
3811 if (nonstatic_contended_count > 0) {
3812 next_nonstatic_padded_offset += pad_size;
3813 }
3814
3815 // collect all contended groups
3816 BitMap bm(cp->size());
3817 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3818 // skip already laid out fields
3819 if (fs.is_offset_set()) continue;
3820
3821 if (fs.is_contended()) {
3822 bm.set_bit(fs.contended_group());
3823 }
3824 }
3825
3826 int current_group = -1;
3827 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3828
3829 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3830
3831 // skip already laid out fields
3832 if (fs.is_offset_set()) continue;
3833
3834 // skip non-contended fields and fields from different group
3835 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3836
3837 // handle statics below
3838 if (fs.access_flags().is_static()) continue;
3839
3840 int real_offset;
3841 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3842
3843 switch (atype) {
3844 case NONSTATIC_BYTE:
3845 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3846 real_offset = next_nonstatic_padded_offset;
3847 next_nonstatic_padded_offset += 1;
3848 break;
3849
3850 case NONSTATIC_SHORT:
3851 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3852 real_offset = next_nonstatic_padded_offset;
3853 next_nonstatic_padded_offset += BytesPerShort;
3854 break;
3855
3856 case NONSTATIC_WORD:
3857 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3858 real_offset = next_nonstatic_padded_offset;
3859 next_nonstatic_padded_offset += BytesPerInt;
3860 break;
3861
3862 case NONSTATIC_DOUBLE:
3863 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3864 real_offset = next_nonstatic_padded_offset;
3865 next_nonstatic_padded_offset += BytesPerLong;
3866 break;
3867
3868 case NONSTATIC_OOP:
3869 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3870 real_offset = next_nonstatic_padded_offset;
3871 next_nonstatic_padded_offset += heapOopSize;
3872
3873 // Create new oop map
3874 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3875 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3876 nonstatic_oop_map_count += 1;
3877 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3878 first_nonstatic_oop_offset = real_offset;
3879 }
3880 break;
3881
3882 default:
3883 ShouldNotReachHere();
3884 }
3885
3886 if (fs.contended_group() == 0) {
3887 // Contended group defines the equivalence class over the fields:
3888 // the fields within the same contended group are not inter-padded.
3889 // The only exception is default group, which does not incur the
3890 // equivalence, and so requires intra-padding.
3891 next_nonstatic_padded_offset += pad_size;
3892 }
3893
3894 fs.set_offset(real_offset);
3895 } // for
3896
3897 // Start laying out the next group.
3898 // Note that this will effectively pad the last group in the back;
3899 // this is expected to alleviate memory contention effects for
3900 // subclass fields and/or adjacent object.
3901 // If this was the default group, the padding is already in place.
3902 if (current_group != 0) {
3903 next_nonstatic_padded_offset += pad_size;
3904 }
3905 }
3906
3907 // handle static fields
3908
3909 // if there is at least one contended field, we need to have pre-padding for them
3910 if (static_contended_count > 0) {
3911 next_static_padded_offset += pad_size;
3912 }
3913
3914 current_group = -1;
3915 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3916
3917 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3918
3919 // skip already laid out fields
3920 if (fs.is_offset_set()) continue;
3921
3922 // skip non-contended fields and fields from different group
3923 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3924
3925 // non-statics already handled above
3926 if (!fs.access_flags().is_static()) continue;
3927
3928 int real_offset;
3929 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3930
3931 switch (atype) {
3932
3933 case STATIC_BYTE:
3934 next_static_padded_offset = align_size_up(next_static_padded_offset, 1);
3935 real_offset = next_static_padded_offset;
3936 next_static_padded_offset += 1;
3937 break;
3938
3939 case STATIC_SHORT:
3940 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerShort);
3941 real_offset = next_static_padded_offset;
3942 next_static_padded_offset += BytesPerShort;
3943 break;
3944
3945 case STATIC_WORD:
3946 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerInt);
3947 real_offset = next_static_padded_offset;
3948 next_static_padded_offset += BytesPerInt;
3949 break;
3950
3951 case STATIC_DOUBLE:
3952 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerLong);
3953 real_offset = next_static_padded_offset;
3954 next_static_padded_offset += BytesPerLong;
3955 break;
3956
3957 case STATIC_OOP:
3958 next_static_padded_offset = align_size_up(next_static_padded_offset, heapOopSize);
3959 real_offset = next_static_padded_offset;
3960 next_static_padded_offset += heapOopSize;
3961 break;
3962
3963 default:
3964 ShouldNotReachHere();
3965 }
3966
3967 if (fs.contended_group() == 0) {
3968 // Contended group defines the equivalence class over the fields:
3969 // the fields within the same contended group are not inter-padded.
3970 // The only exception is default group, which does not incur the
3971 // equivalence, and so requires intra-padding.
3972 next_static_padded_offset += pad_size;
3973 }
3974
3975 fs.set_offset(real_offset);
3976 } // for
3977
3978 // Start laying out the next group.
3979 // Note that this will effectively pad the last group in the back;
3980 // this is expected to alleviate memory contention effects for
3981 // subclass fields and/or adjacent object.
3982 // If this was the default group, the padding is already in place.
3983 if (current_group != 0) {
3984 next_static_padded_offset += pad_size;
3985 }
3986
3987 }
3988
3989 } // handle contended
3990
3991 // Size of instances
3992 int instance_size;
3993
3994 int notaligned_offset = next_nonstatic_padded_offset;
3995
3996 // Entire class is contended, pad in the back.
3997 // This helps to alleviate memory contention effects for subclass fields
3998 // and/or adjacent object.
3999 if (parsed_annotations.is_contended()) {
4000 notaligned_offset += pad_size;
4001 next_static_padded_offset += pad_size;
4002 }
4003
4004 int next_static_type_offset = align_size_up(next_static_padded_offset, wordSize);
4005 int static_field_size = (next_static_type_offset -
4006 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4007
4008 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
4009 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
4010 - first_nonstatic_field_offset)/heapOopSize);
4011
4012 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
4013 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
4014
4015 assert(instance_size == align_object_size(align_size_up(
4016 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations.is_contended()) ? pad_size : 0)),
4017 wordSize) / wordSize), "consistent layout helper value");
4018
4019 // Number of non-static oop map blocks allocated at end of klass.
4020 const unsigned int total_oop_map_count =
4021 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
4022 first_nonstatic_oop_offset);
4023
4024 // Compute reference type
4025 ReferenceType rt;
4026 if (super_klass() == NULL) {
4027 rt = REF_NONE;
4028 } else {
4029 rt = super_klass->reference_type();
4030 }
4031
4032 // We can now create the basic Klass* for this klass
4033 int total_oop_map_size2 =
4034 InstanceKlass::nonstatic_oop_map_size(total_oop_map_count);
4035
4036 Klass* ik = InstanceKlass::allocate_instance_klass(loader_data,
4037 vtable_size,
4038 itable_size,
4039 static_field_size,
4040 total_oop_map_size2,
4041 rt,
4042 access_flags,
4043 name,
4044 super_klass(),
4045 host_klass,
4046 CHECK_(nullHandle));
4047
4048 // Add all classes to our internal class loader list here,
4049 // including classes in the bootstrap (NULL) class loader.
4050 loader_data->add_class(ik);
4051
4052 instanceKlassHandle this_klass (THREAD, ik);
4053
4054 assert(this_klass->static_field_size() == static_field_size, "sanity");
4055 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
4056 "sanity");
4057
4058 // Fill in information already parsed
4059 this_klass->set_should_verify_class(verify);
4060 jint lh = Klass::instance_layout_helper(instance_size, false);
4061 this_klass->set_layout_helper(lh);
4062 assert(this_klass->oop_is_instance(), "layout is correct");
4063 assert(this_klass->size_helper() == instance_size, "correct size_helper");
4064 // Not yet: supers are done below to support the new subtype-checking fields
4065 //this_klass->set_super(super_klass());
4066 this_klass->set_class_loader_data(loader_data);
4067 this_klass->set_nonstatic_field_size(nonstatic_field_size);
4068 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
4069 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4070 cp->set_pool_holder(this_klass());
4071 error_handler.set_in_error(false); // turn off error handler for cp
4072 this_klass->set_constants(cp());
4073 this_klass->set_local_interfaces(local_interfaces);
4074 this_klass->set_fields(fields, java_fields_count);
4075 this_klass->set_methods(methods);
4076 if (has_final_method) {
4077 this_klass->set_has_final_method();
4078 }
4079 this_klass->set_method_ordering(method_ordering);
4080 // The InstanceKlass::_methods_jmethod_ids cache and the
4081 // InstanceKlass::_methods_cached_itable_indices cache are
4082 // both managed on the assumption that the initial cache
4083 // size is equal to the number of methods in the class. If
4084 // that changes, then InstanceKlass::idnum_can_increment()
4085 // has to be changed accordingly.
4086 this_klass->set_initial_method_idnum(methods->length());
4087 this_klass->set_name(cp->klass_name_at(this_class_index));
4088 if (is_anonymous()) // I am well known to myself
4089 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4090
4091 // Allocate an annotation type if needed.
4092 if (fields_annotations != NULL ||
4093 methods_annotations != NULL ||
4094 methods_parameter_annotations != NULL ||
4095 methods_default_annotations != NULL ||
4096 fields_type_annotations != NULL ||
4097 methods_type_annotations != NULL) {
4098 Annotations* anno = Annotations::allocate(loader_data,
4099 fields_annotations, methods_annotations,
4100 methods_parameter_annotations,
4101 methods_default_annotations, CHECK_(nullHandle));
4102 this_klass->set_annotations(anno);
4103 } else {
4104 this_klass->set_annotations(NULL);
4105 }
4106
4107 if (fields_type_annotations != NULL ||
4108 methods_type_annotations != NULL) {
4109 assert(this_klass->annotations() != NULL, "annotations should have been allocated");
4110 Annotations* anno = Annotations::allocate(loader_data,
4111 fields_type_annotations,
4112 methods_type_annotations,
4113 NULL,
4114 NULL, CHECK_(nullHandle));
4115 this_klass->annotations()->set_type_annotations(anno);
4116 }
4117
4118 this_klass->set_minor_version(minor_version);
4119 this_klass->set_major_version(major_version);
4120 this_klass->set_has_default_methods(has_default_methods);
4121
4122 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4123 // (We used to do this lazily, but now we query it in Rewriter,
4124 // which is eagerly done for every method, so we might as well do it now,
4125 // when everything is fresh in memory.)
4126 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4127 for (int j = 0; j < methods->length(); j++) {
4128 methods->at(j)->init_intrinsic_id();
4129 }
4130 }
4131
4132 if (cached_class_file_bytes != NULL) {
4133 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4134 this_klass->set_cached_class_file(cached_class_file_bytes,
4135 cached_class_file_length);
4136 }
4137
4138 // Fill in field values obtained by parse_classfile_attributes
4139 if (parsed_annotations.has_any_annotations())
4140 parsed_annotations.apply_to(this_klass);
4141
4142 // Create annotations
4143 if (_annotations != NULL && this_klass->annotations() == NULL) {
4144 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4145 this_klass->set_annotations(anno);
4146 }
4147 apply_parsed_class_attributes(this_klass);
4148
4149 // Create type annotations
4150 if (_type_annotations != NULL) {
4151 if (this_klass->annotations() == NULL) {
4152 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4153 this_klass->set_annotations(anno);
4154 }
4155 if (this_klass->annotations()->type_annotations() == NULL) {
4156 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4157 this_klass->annotations()->set_type_annotations(anno);
4158 }
4159 this_klass->annotations()->type_annotations()->set_class_annotations(_type_annotations);
4160 }
4161
4162 // Miranda methods
4163 if ((num_miranda_methods > 0) ||
4164 // if this class introduced new miranda methods or
4165 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4166 // super class exists and this class inherited miranda methods
4167 ) {
4168 this_klass->set_has_miranda_methods(); // then set a flag
4169 }
4170
4171 this_klass->set_transitive_interfaces(transitive_interfaces);
4172
4173 // Fill in information needed to compute superclasses.
4174 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4175
4176 // Initialize itable offset tables
4177 klassItable::setup_itable_offset_table(this_klass);
4178
4179 // Compute transitive closure of interfaces this class implements
4180 // Do final class setup
4181 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
4182
4183 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4184 set_precomputed_flags(this_klass);
4185
4186 // reinitialize modifiers, using the InnerClasses attribute
4187 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4188 this_klass->set_modifier_flags(computed_modifiers);
4189
4190 // check if this class can access its super class
4191 check_super_class_access(this_klass, CHECK_(nullHandle));
4192
4193 // check if this class can access its superinterfaces
4194 check_super_interface_access(this_klass, CHECK_(nullHandle));
4195
4196 // check if this class overrides any final method
4197 check_final_method_override(this_klass, CHECK_(nullHandle));
4198
4199 // check that if this class is an interface then it doesn't have static methods
4200 if (this_klass->is_interface()) {
4201 /* An interface in a JAVA 8 classfile can be static */
4202 if (_major_version < JAVA_8_VERSION) {
4203 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4204 }
4205 }
4206
4207
4208 #ifdef ASSERT
4209 if (ParseAllGenericSignatures) {
4210 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4211 }
4212 #endif
4213
4214 // Generate any default methods - default methods are interface methods
4215 // that have a default implementation. This is new with Lambda project.
4216 if (has_default_methods && !access_flags.is_interface() &&
4217 local_interfaces->length() > 0) {
4218 DefaultMethods::generate_default_methods(
4219 this_klass(), &all_mirandas, CHECK_(nullHandle));
4220 }
4221
4222 // Allocate mirror and initialize static fields
4223 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
4224
4225 // Allocate a simple java object for locking during class initialization.
4226 // This needs to be a java object because it can be held across a java call.
4227 typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
4228 this_klass->set_init_lock(r);
4229
4230 // TODO: Move these oops to the mirror
4231 this_klass->set_protection_domain(protection_domain());
4232
4233 // Update the loader_data graph.
4234 record_defined_class_dependencies(this_klass, CHECK_NULL);
4235
4236 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4237 false /* not shared class */);
4238
4239 if (TraceClassLoading) {
4240 ResourceMark rm;
4241 // print in a single call to reduce interleaving of output
4242 if (cfs->source() != NULL) {
4243 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4244 cfs->source());
4245 } else if (class_loader.is_null()) {
4246 if (THREAD->is_Java_thread()) {
4247 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4248 tty->print("[Loaded %s by instance of %s]\n",
4249 this_klass->external_name(),
4250 InstanceKlass::cast(caller)->external_name());
4251 } else {
4252 tty->print("[Loaded %s]\n", this_klass->external_name());
4253 }
4254 } else {
4255 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4256 InstanceKlass::cast(class_loader->klass())->external_name());
4257 }
4258 }
4259
4260 if (TraceClassResolution) {
4261 ResourceMark rm;
4262 // print out the superclass.
4263 const char * from = this_klass()->external_name();
4264 if (this_klass->java_super() != NULL) {
4265 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4266 }
4267 // print out each of the interface classes referred to by this class.
4268 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4269 if (local_interfaces != NULL) {
4270 int length = local_interfaces->length();
4271 for (int i = 0; i < length; i++) {
4272 Klass* k = local_interfaces->at(i);
4273 InstanceKlass* to_class = InstanceKlass::cast(k);
4274 const char * to = to_class->external_name();
4275 tty->print("RESOLVE %s %s (interface)\n", from, to);
4276 }
4277 }
4278 }
4279
4280 #ifndef PRODUCT
4281 if( PrintCompactFieldsSavings ) {
4282 ResourceMark rm;
4283 if( nonstatic_field_size < orig_nonstatic_field_size ) {
4284 tty->print("[Saved %d of %d bytes in %s]\n",
4285 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
4286 orig_nonstatic_field_size*heapOopSize,
4287 this_klass->external_name());
4288 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
4289 tty->print("[Wasted %d over %d bytes in %s]\n",
4290 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
4291 orig_nonstatic_field_size*heapOopSize,
4292 this_klass->external_name());
4293 }
4294 }
4295 #endif
4296
4297 #ifndef PRODUCT
4298 if (PrintFieldLayout) {
4299 print_field_layout(name,
4300 fields,
4301 cp,
4302 instance_size,
4303 first_nonstatic_field_offset,
4304 next_nonstatic_field_offset,
4305 next_static_type_offset);
4306 }
4307 #endif
4308
4309 // preserve result across HandleMark
4310 preserve_this_klass = this_klass();
4311 }
4312
4313 // Create new handle outside HandleMark (might be needed for
4314 // Extended Class Redefinition)
4315 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4316 debug_only(this_klass->verify();)
4317
4318 return this_klass;
4319 }
4320
4321 void ClassFileParser::print_field_layout(Symbol* name,
4322 Array<u2>* fields,
4323 constantPoolHandle cp,
4324 int instance_size,
4325 int instance_fields_start,
4326 int instance_fields_end,
4327 int static_fields_end) {
4328 tty->print("%s: field layout\n", name->as_klass_external_name());
4329 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4330 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4331 if (!fs.access_flags().is_static()) {
4332 tty->print(" @%3d \"%s\" %s\n",
4333 fs.offset(),
4334 fs.name()->as_klass_external_name(),
4335 fs.signature()->as_klass_external_name());
4336 }
4337 }
4338 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4339 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4340 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4341 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4342 if (fs.access_flags().is_static()) {
4343 tty->print(" @%3d \"%s\" %s\n",
4344 fs.offset(),
4345 fs.name()->as_klass_external_name(),
4346 fs.signature()->as_klass_external_name());
4347 }
4348 }
4349 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4350 tty->print("\n");
4351 }
4352
4353 unsigned int
4354 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4355 unsigned int nonstatic_oop_map_count,
4356 int first_nonstatic_oop_offset) {
4357 unsigned int map_count =
4358 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4359 if (nonstatic_oop_map_count > 0) {
4360 // We have oops to add to map
4361 if (map_count == 0) {
4362 map_count = nonstatic_oop_map_count;
4363 } else {
4364 // Check whether we should add a new map block or whether the last one can
4365 // be extended
4366 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4367 OopMapBlock* const last_map = first_map + map_count - 1;
4368
4369 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4370 if (next_offset == first_nonstatic_oop_offset) {
4371 // There is no gap bettwen superklass's last oop field and first
4372 // local oop field, merge maps.
4373 nonstatic_oop_map_count -= 1;
4374 } else {
4375 // Superklass didn't end with a oop field, add extra maps
4376 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4377 }
4378 map_count += nonstatic_oop_map_count;
4379 }
4380 }
4381 return map_count;
4382 }
4383
4384
4385 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4386 unsigned int nonstatic_oop_map_count,
4387 int* nonstatic_oop_offsets,
4388 unsigned int* nonstatic_oop_counts) {
4389 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4390 const InstanceKlass* const super = k->superklass();
4391 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4392 if (super_count > 0) {
4393 // Copy maps from superklass
4394 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4395 for (unsigned int i = 0; i < super_count; ++i) {
4396 *this_oop_map++ = *super_oop_map++;
4397 }
4398 }
4399
4400 if (nonstatic_oop_map_count > 0) {
4401 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4402 // The counts differ because there is no gap between superklass's last oop
4403 // field and the first local oop field. Extend the last oop map copied
4404 // from the superklass instead of creating new one.
4405 nonstatic_oop_map_count--;
4406 nonstatic_oop_offsets++;
4407 this_oop_map--;
4408 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4409 this_oop_map++;
4410 }
4411
4412 // Add new map blocks, fill them
4413 while (nonstatic_oop_map_count-- > 0) {
4414 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4415 this_oop_map->set_count(*nonstatic_oop_counts++);
4416 this_oop_map++;
4417 }
4418 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4419 this_oop_map, "sanity");
4420 }
4421 }
4422
4423
4424 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4425 Klass* super = k->super();
4426
4427 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4428 // in which case we don't have to register objects as finalizable
4429 if (!_has_empty_finalizer) {
4430 if (_has_finalizer ||
4431 (super != NULL && super->has_finalizer())) {
4432 k->set_has_finalizer();
4433 }
4434 }
4435
4436 #ifdef ASSERT
4437 bool f = false;
4438 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4439 vmSymbols::void_method_signature());
4440 if (m != NULL && !m->is_empty_method()) {
4441 f = true;
4442 }
4443 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4444 #endif
4445
4446 // Check if this klass supports the java.lang.Cloneable interface
4447 if (SystemDictionary::Cloneable_klass_loaded()) {
4448 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4449 k->set_is_cloneable();
4450 }
4451 }
4452
4453 // Check if this klass has a vanilla default constructor
4454 if (super == NULL) {
4455 // java.lang.Object has empty default constructor
4456 k->set_has_vanilla_constructor();
4457 } else {
4458 if (super->has_vanilla_constructor() &&
4459 _has_vanilla_constructor) {
4460 k->set_has_vanilla_constructor();
4461 }
4462 #ifdef ASSERT
4463 bool v = false;
4464 if (super->has_vanilla_constructor()) {
4465 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4466 ), vmSymbols::void_method_signature());
4467 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4468 v = true;
4469 }
4470 }
4471 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4472 #endif
4473 }
4474
4475 // If it cannot be fast-path allocated, set a bit in the layout helper.
4476 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4477 assert(k->size_helper() > 0, "layout_helper is initialized");
4478 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4479 || k->is_abstract() || k->is_interface()
4480 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4481 || k->size_helper() >= FastAllocateSizeLimit) {
4482 // Forbid fast-path allocation.
4483 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4484 k->set_layout_helper(lh);
4485 }
4486 }
4487
4488 // Attach super classes and interface classes to class loader data
4489 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4490 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4491 if (defining_loader_data->is_the_null_class_loader_data()) {
4492 // Dependencies to null class loader data are implicit.
4493 return;
4494 } else {
4495 // add super class dependency
4496 Klass* super = defined_klass->super();
4497 if (super != NULL) {
4498 defining_loader_data->record_dependency(super, CHECK);
4499 }
4500
4501 // add super interface dependencies
4502 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4503 if (local_interfaces != NULL) {
4504 int length = local_interfaces->length();
4505 for (int i = 0; i < length; i++) {
4506 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4507 }
4508 }
4509 }
4510 }
4511
4512 // utility method for appending and array with check for duplicates
4513
4514 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4515 // iterate over new interfaces
4516 for (int i = 0; i < ifs->length(); i++) {
4517 Klass* e = ifs->at(i);
4518 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4519 // add new interface
4520 result->append_if_missing(e);
4521 }
4522 }
4523
4524
4525 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(ClassLoaderData* loader_data, instanceKlassHandle super, Array<Klass*>* local_ifs, TRAPS) {
4526 // Compute maximum size for transitive interfaces
4527 int max_transitive_size = 0;
4528 int super_size = 0;
4529 // Add superclass transitive interfaces size
4530 if (super.not_null()) {
4531 super_size = super->transitive_interfaces()->length();
4532 max_transitive_size += super_size;
4533 }
4534 // Add local interfaces' super interfaces
4535 int local_size = local_ifs->length();
4536 for (int i = 0; i < local_size; i++) {
4537 Klass* l = local_ifs->at(i);
4538 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4539 }
4540 // Finally add local interfaces
4541 max_transitive_size += local_size;
4542 // Construct array
4543 if (max_transitive_size == 0) {
4544 // no interfaces, use canonicalized array
4545 return Universe::the_empty_klass_array();
4546 } else if (max_transitive_size == super_size) {
4547 // no new local interfaces added, share superklass' transitive interface array
4548 return super->transitive_interfaces();
4549 } else if (max_transitive_size == local_size) {
4550 // only local interfaces added, share local interface array
4551 return local_ifs;
4552 } else {
4553 ResourceMark rm;
4554 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4555
4556 // Copy down from superclass
4557 if (super.not_null()) {
4558 append_interfaces(result, super->transitive_interfaces());
4559 }
4560
4561 // Copy down from local interfaces' superinterfaces
4562 for (int i = 0; i < local_ifs->length(); i++) {
4563 Klass* l = local_ifs->at(i);
4564 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4565 }
4566 // Finally add local interfaces
4567 append_interfaces(result, local_ifs);
4568
4569 // length will be less than the max_transitive_size if duplicates were removed
4570 int length = result->length();
4571 assert(length <= max_transitive_size, "just checking");
4572 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4573 for (int i = 0; i < length; i++) {
4574 Klass* e = result->at(i);
4575 assert(e != NULL, "just checking");
4576 new_result->at_put(i, e);
4577 }
4578 return new_result;
4579 }
4580 }
4581
4582
4583 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4584 Klass* super = this_klass->super();
4585 if ((super != NULL) &&
4586 (!Reflection::verify_class_access(this_klass(), super, false))) {
4587 ResourceMark rm(THREAD);
4588 Exceptions::fthrow(
4589 THREAD_AND_LOCATION,
4590 vmSymbols::java_lang_IllegalAccessError(),
4591 "class %s cannot access its superclass %s",
4592 this_klass->external_name(),
4593 InstanceKlass::cast(super)->external_name()
4594 );
4595 return;
4596 }
4597 }
4598
4599
4600 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4601 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4602 int lng = local_interfaces->length();
4603 for (int i = lng - 1; i >= 0; i--) {
4604 Klass* k = local_interfaces->at(i);
4605 assert (k != NULL && k->is_interface(), "invalid interface");
4606 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4607 ResourceMark rm(THREAD);
4608 Exceptions::fthrow(
4609 THREAD_AND_LOCATION,
4610 vmSymbols::java_lang_IllegalAccessError(),
4611 "class %s cannot access its superinterface %s",
4612 this_klass->external_name(),
4613 InstanceKlass::cast(k)->external_name()
4614 );
4615 return;
4616 }
4617 }
4618 }
4619
4620
4621 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4622 Array<Method*>* methods = this_klass->methods();
4623 int num_methods = methods->length();
4624
4625 // go thru each method and check if it overrides a final method
4626 for (int index = 0; index < num_methods; index++) {
4627 Method* m = methods->at(index);
4628
4629 // skip private, static and <init> methods
4630 if ((!m->is_private()) &&
4631 (!m->is_static()) &&
4632 (m->name() != vmSymbols::object_initializer_name())) {
4633
4634 Symbol* name = m->name();
4635 Symbol* signature = m->signature();
4636 Klass* k = this_klass->super();
4637 Method* super_m = NULL;
4638 while (k != NULL) {
4639 // skip supers that don't have final methods.
4640 if (k->has_final_method()) {
4641 // lookup a matching method in the super class hierarchy
4642 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4643 if (super_m == NULL) {
4644 break; // didn't find any match; get out
4645 }
4646
4647 if (super_m->is_final() &&
4648 // matching method in super is final
4649 (Reflection::verify_field_access(this_klass(),
4650 super_m->method_holder(),
4651 super_m->method_holder(),
4652 super_m->access_flags(), false))
4653 // this class can access super final method and therefore override
4654 ) {
4655 ResourceMark rm(THREAD);
4656 Exceptions::fthrow(
4657 THREAD_AND_LOCATION,
4658 vmSymbols::java_lang_VerifyError(),
4659 "class %s overrides final method %s.%s",
4660 this_klass->external_name(),
4661 name->as_C_string(),
4662 signature->as_C_string()
4663 );
4664 return;
4665 }
4666
4667 // continue to look from super_m's holder's super.
4668 k = super_m->method_holder()->super();
4669 continue;
4670 }
4671
4672 k = k->super();
4673 }
4674 }
4675 }
4676 }
4677
4678
4679 // assumes that this_klass is an interface
4680 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4681 assert(this_klass->is_interface(), "not an interface");
4682 Array<Method*>* methods = this_klass->methods();
4683 int num_methods = methods->length();
4684
4685 for (int index = 0; index < num_methods; index++) {
4686 Method* m = methods->at(index);
4687 // if m is static and not the init method, throw a verify error
4688 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4689 ResourceMark rm(THREAD);
4690 Exceptions::fthrow(
4691 THREAD_AND_LOCATION,
4692 vmSymbols::java_lang_VerifyError(),
4693 "Illegal static method %s in interface %s",
4694 m->name()->as_C_string(),
4695 this_klass->external_name()
4696 );
4697 return;
4698 }
4699 }
4700 }
4701
4702 // utility methods for format checking
4703
4704 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4705 if (!_need_verify) { return; }
4706
4707 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4708 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4709 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4710 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4711 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4712 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4713 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4714
4715 if ((is_abstract && is_final) ||
4716 (is_interface && !is_abstract) ||
4717 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4718 (!is_interface && major_gte_15 && is_annotation)) {
4719 ResourceMark rm(THREAD);
4720 Exceptions::fthrow(
4721 THREAD_AND_LOCATION,
4722 vmSymbols::java_lang_ClassFormatError(),
4723 "Illegal class modifiers in class %s: 0x%X",
4724 _class_name->as_C_string(), flags
4725 );
4726 return;
4727 }
4728 }
4729
4730 bool ClassFileParser::has_illegal_visibility(jint flags) {
4731 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4732 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4733 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4734
4735 return ((is_public && is_protected) ||
4736 (is_public && is_private) ||
4737 (is_protected && is_private));
4738 }
4739
4740 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4741 u2 max_version =
4742 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4743 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4744 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4745 (major <= max_version) &&
4746 ((major != max_version) ||
4747 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4748 }
4749
4750 void ClassFileParser::verify_legal_field_modifiers(
4751 jint flags, bool is_interface, TRAPS) {
4752 if (!_need_verify) { return; }
4753
4754 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4755 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4756 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4757 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4758 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4759 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4760 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4761 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4762 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4763
4764 bool is_illegal = false;
4765
4766 if (is_interface) {
4767 if (!is_public || !is_static || !is_final || is_private ||
4768 is_protected || is_volatile || is_transient ||
4769 (major_gte_15 && is_enum)) {
4770 is_illegal = true;
4771 }
4772 } else { // not interface
4773 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4774 is_illegal = true;
4775 }
4776 }
4777
4778 if (is_illegal) {
4779 ResourceMark rm(THREAD);
4780 Exceptions::fthrow(
4781 THREAD_AND_LOCATION,
4782 vmSymbols::java_lang_ClassFormatError(),
4783 "Illegal field modifiers in class %s: 0x%X",
4784 _class_name->as_C_string(), flags);
4785 return;
4786 }
4787 }
4788
4789 void ClassFileParser::verify_legal_method_modifiers(
4790 jint flags, bool is_interface, Symbol* name, TRAPS) {
4791 if (!_need_verify) { return; }
4792
4793 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4794 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4795 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4796 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4797 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4798 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4799 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4800 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4801 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4802 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4803 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4804 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4805 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4806
4807 bool is_illegal = false;
4808
4809 if (is_interface) {
4810 if (major_gte_8) {
4811 // Class file version is JAVA_8_VERSION or later Methods of
4812 // interfaces may set any of the flags except ACC_PROTECTED,
4813 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4814 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4815 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4816 (is_native || is_protected || is_final || is_synchronized) ||
4817 // If a specific method of a class or interface has its
4818 // ACC_ABSTRACT flag set, it must not have any of its
4819 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4820 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4821 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4822 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4823 (is_abstract && (is_private || is_static || is_strict))) {
4824 is_illegal = true;
4825 }
4826 } else if (major_gte_15) {
4827 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4828 if (!is_public || is_static || is_final || is_synchronized ||
4829 is_native || !is_abstract || is_strict) {
4830 is_illegal = true;
4831 }
4832 } else {
4833 // Class file version is pre-JAVA_1_5_VERSION
4834 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4835 is_illegal = true;
4836 }
4837 }
4838 } else { // not interface
4839 if (is_initializer) {
4840 if (is_static || is_final || is_synchronized || is_native ||
4841 is_abstract || (major_gte_15 && is_bridge)) {
4842 is_illegal = true;
4843 }
4844 } else { // not initializer
4845 if (is_abstract) {
4846 if ((is_final || is_native || is_private || is_static ||
4847 (major_gte_15 && (is_synchronized || is_strict)))) {
4848 is_illegal = true;
4849 }
4850 }
4851 if (has_illegal_visibility(flags)) {
4852 is_illegal = true;
4853 }
4854 }
4855 }
4856
4857 if (is_illegal) {
4858 ResourceMark rm(THREAD);
4859 Exceptions::fthrow(
4860 THREAD_AND_LOCATION,
4861 vmSymbols::java_lang_ClassFormatError(),
4862 "Method %s in class %s has illegal modifiers: 0x%X",
4863 name->as_C_string(), _class_name->as_C_string(), flags);
4864 return;
4865 }
4866 }
4867
4868 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4869 assert(_need_verify, "only called when _need_verify is true");
4870 int i = 0;
4871 int count = length >> 2;
4872 for (int k=0; k<count; k++) {
4873 unsigned char b0 = buffer[i];
4874 unsigned char b1 = buffer[i+1];
4875 unsigned char b2 = buffer[i+2];
4876 unsigned char b3 = buffer[i+3];
4877 // For an unsigned char v,
4878 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4879 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4880 unsigned char res = b0 | b0 - 1 |
4881 b1 | b1 - 1 |
4882 b2 | b2 - 1 |
4883 b3 | b3 - 1;
4884 if (res >= 128) break;
4885 i += 4;
4886 }
4887 for(; i < length; i++) {
4888 unsigned short c;
4889 // no embedded zeros
4890 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4891 if(buffer[i] < 128) {
4892 continue;
4893 }
4894 if ((i + 5) < length) { // see if it's legal supplementary character
4895 if (UTF8::is_supplementary_character(&buffer[i])) {
4896 c = UTF8::get_supplementary_character(&buffer[i]);
4897 i += 5;
4898 continue;
4899 }
4900 }
4901 switch (buffer[i] >> 4) {
4902 default: break;
4903 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4904 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4905 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4906 c = (buffer[i] & 0x1F) << 6;
4907 i++;
4908 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4909 c += buffer[i] & 0x3F;
4910 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4911 // for classes with major > 47, c must a null or a character in its shortest form
4912 break;
4913 }
4914 }
4915 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4916 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4917 c = (buffer[i] & 0xF) << 12;
4918 i += 2;
4919 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4920 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4921 if (_major_version <= 47 || c >= 0x800) {
4922 // for classes with major > 47, c must be in its shortest form
4923 break;
4924 }
4925 }
4926 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4927 } // end of switch
4928 } // end of for
4929 }
4930
4931 // Checks if name is a legal class name.
4932 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4933 if (!_need_verify || _relax_verify) { return; }
4934
4935 char buf[fixed_buffer_size];
4936 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4937 unsigned int length = name->utf8_length();
4938 bool legal = false;
4939
4940 if (length > 0) {
4941 char* p;
4942 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4943 p = skip_over_field_signature(bytes, false, length, CHECK);
4944 legal = (p != NULL) && ((p - bytes) == (int)length);
4945 } else if (_major_version < JAVA_1_5_VERSION) {
4946 if (bytes[0] != '<') {
4947 p = skip_over_field_name(bytes, true, length);
4948 legal = (p != NULL) && ((p - bytes) == (int)length);
4949 }
4950 } else {
4951 // 4900761: relax the constraints based on JSR202 spec
4952 // Class names may be drawn from the entire Unicode character set.
4953 // Identifiers between '/' must be unqualified names.
4954 // The utf8 string has been verified when parsing cpool entries.
4955 legal = verify_unqualified_name(bytes, length, LegalClass);
4956 }
4957 }
4958 if (!legal) {
4959 ResourceMark rm(THREAD);
4960 Exceptions::fthrow(
4961 THREAD_AND_LOCATION,
4962 vmSymbols::java_lang_ClassFormatError(),
4963 "Illegal class name \"%s\" in class file %s", bytes,
4964 _class_name->as_C_string()
4965 );
4966 return;
4967 }
4968 }
4969
4970 // Checks if name is a legal field name.
4971 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4972 if (!_need_verify || _relax_verify) { return; }
4973
4974 char buf[fixed_buffer_size];
4975 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4976 unsigned int length = name->utf8_length();
4977 bool legal = false;
4978
4979 if (length > 0) {
4980 if (_major_version < JAVA_1_5_VERSION) {
4981 if (bytes[0] != '<') {
4982 char* p = skip_over_field_name(bytes, false, length);
4983 legal = (p != NULL) && ((p - bytes) == (int)length);
4984 }
4985 } else {
4986 // 4881221: relax the constraints based on JSR202 spec
4987 legal = verify_unqualified_name(bytes, length, LegalField);
4988 }
4989 }
4990
4991 if (!legal) {
4992 ResourceMark rm(THREAD);
4993 Exceptions::fthrow(
4994 THREAD_AND_LOCATION,
4995 vmSymbols::java_lang_ClassFormatError(),
4996 "Illegal field name \"%s\" in class %s", bytes,
4997 _class_name->as_C_string()
4998 );
4999 return;
5000 }
5001 }
5002
5003 // Checks if name is a legal method name.
5004 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5005 if (!_need_verify || _relax_verify) { return; }
5006
5007 assert(name != NULL, "method name is null");
5008 char buf[fixed_buffer_size];
5009 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5010 unsigned int length = name->utf8_length();
5011 bool legal = false;
5012
5013 if (length > 0) {
5014 if (bytes[0] == '<') {
5015 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5016 legal = true;
5017 }
5018 } else if (_major_version < JAVA_1_5_VERSION) {
5019 char* p;
5020 p = skip_over_field_name(bytes, false, length);
5021 legal = (p != NULL) && ((p - bytes) == (int)length);
5022 } else {
5023 // 4881221: relax the constraints based on JSR202 spec
5024 legal = verify_unqualified_name(bytes, length, LegalMethod);
5025 }
5026 }
5027
5028 if (!legal) {
5029 ResourceMark rm(THREAD);
5030 Exceptions::fthrow(
5031 THREAD_AND_LOCATION,
5032 vmSymbols::java_lang_ClassFormatError(),
5033 "Illegal method name \"%s\" in class %s", bytes,
5034 _class_name->as_C_string()
5035 );
5036 return;
5037 }
5038 }
5039
5040
5041 // Checks if signature is a legal field signature.
5042 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5043 if (!_need_verify) { return; }
5044
5045 char buf[fixed_buffer_size];
5046 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5047 unsigned int length = signature->utf8_length();
5048 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5049
5050 if (p == NULL || (p - bytes) != (int)length) {
5051 throwIllegalSignature("Field", name, signature, CHECK);
5052 }
5053 }
5054
5055 // Checks if signature is a legal method signature.
5056 // Returns number of parameters
5057 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5058 if (!_need_verify) {
5059 // make sure caller's args_size will be less than 0 even for non-static
5060 // method so it will be recomputed in compute_size_of_parameters().
5061 return -2;
5062 }
5063
5064 unsigned int args_size = 0;
5065 char buf[fixed_buffer_size];
5066 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5067 unsigned int length = signature->utf8_length();
5068 char* nextp;
5069
5070 // The first character must be a '('
5071 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5072 length--;
5073 // Skip over legal field signatures
5074 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5075 while ((length > 0) && (nextp != NULL)) {
5076 args_size++;
5077 if (p[0] == 'J' || p[0] == 'D') {
5078 args_size++;
5079 }
5080 length -= nextp - p;
5081 p = nextp;
5082 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5083 }
5084 // The first non-signature thing better be a ')'
5085 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5086 length--;
5087 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5088 // All internal methods must return void
5089 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5090 return args_size;
5091 }
5092 } else {
5093 // Now we better just have a return value
5094 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5095 if (nextp && ((int)length == (nextp - p))) {
5096 return args_size;
5097 }
5098 }
5099 }
5100 }
5101 // Report error
5102 throwIllegalSignature("Method", name, signature, CHECK_0);
5103 return 0;
5104 }
5105
5106
5107 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5108 // Method names also may not contain the characters '<' or '>', unless <init>
5109 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5110 // method. Because these names have been checked as special cases before
5111 // calling this method in verify_legal_method_name.
5112 bool ClassFileParser::verify_unqualified_name(
5113 char* name, unsigned int length, int type) {
5114 jchar ch;
5115
5116 for (char* p = name; p != name + length; ) {
5117 ch = *p;
5118 if (ch < 128) {
5119 p++;
5120 if (ch == '.' || ch == ';' || ch == '[' ) {
5121 return false; // do not permit '.', ';', or '['
5122 }
5123 if (type != LegalClass && ch == '/') {
5124 return false; // do not permit '/' unless it's class name
5125 }
5126 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5127 return false; // do not permit '<' or '>' in method names
5128 }
5129 } else {
5130 char* tmp_p = UTF8::next(p, &ch);
5131 p = tmp_p;
5132 }
5133 }
5134 return true;
5135 }
5136
5137
5138 // Take pointer to a string. Skip over the longest part of the string that could
5139 // be taken as a fieldname. Allow '/' if slash_ok is true.
5140 // Return a pointer to just past the fieldname.
5141 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5142 // being true, we saw consecutive slashes (meaning we were looking for a
5143 // qualified path but found something that was badly-formed).
5144 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5145 char* p;
5146 jchar ch;
5147 jboolean last_is_slash = false;
5148 jboolean not_first_ch = false;
5149
5150 for (p = name; p != name + length; not_first_ch = true) {
5151 char* old_p = p;
5152 ch = *p;
5153 if (ch < 128) {
5154 p++;
5155 // quick check for ascii
5156 if ((ch >= 'a' && ch <= 'z') ||
5157 (ch >= 'A' && ch <= 'Z') ||
5158 (ch == '_' || ch == '$') ||
5159 (not_first_ch && ch >= '0' && ch <= '9')) {
5160 last_is_slash = false;
5161 continue;
5162 }
5163 if (slash_ok && ch == '/') {
5164 if (last_is_slash) {
5165 return NULL; // Don't permit consecutive slashes
5166 }
5167 last_is_slash = true;
5168 continue;
5169 }
5170 } else {
5171 jint unicode_ch;
5172 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5173 p = tmp_p;
5174 last_is_slash = false;
5175 // Check if ch is Java identifier start or is Java identifier part
5176 // 4672820: call java.lang.Character methods directly without generating separate tables.
5177 EXCEPTION_MARK;
5178 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5179
5180 // return value
5181 JavaValue result(T_BOOLEAN);
5182 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5183 JavaCallArguments args;
5184 args.push_int(unicode_ch);
5185
5186 // public static boolean isJavaIdentifierStart(char ch);
5187 JavaCalls::call_static(&result,
5188 klass,
5189 vmSymbols::isJavaIdentifierStart_name(),
5190 vmSymbols::int_bool_signature(),
5191 &args,
5192 THREAD);
5193
5194 if (HAS_PENDING_EXCEPTION) {
5195 CLEAR_PENDING_EXCEPTION;
5196 return 0;
5197 }
5198 if (result.get_jboolean()) {
5199 continue;
5200 }
5201
5202 if (not_first_ch) {
5203 // public static boolean isJavaIdentifierPart(char ch);
5204 JavaCalls::call_static(&result,
5205 klass,
5206 vmSymbols::isJavaIdentifierPart_name(),
5207 vmSymbols::int_bool_signature(),
5208 &args,
5209 THREAD);
5210
5211 if (HAS_PENDING_EXCEPTION) {
5212 CLEAR_PENDING_EXCEPTION;
5213 return 0;
5214 }
5215
5216 if (result.get_jboolean()) {
5217 continue;
5218 }
5219 }
5220 }
5221 return (not_first_ch) ? old_p : NULL;
5222 }
5223 return (not_first_ch) ? p : NULL;
5224 }
5225
5226
5227 // Take pointer to a string. Skip over the longest part of the string that could
5228 // be taken as a field signature. Allow "void" if void_ok.
5229 // Return a pointer to just past the signature.
5230 // Return NULL if no legal signature is found.
5231 char* ClassFileParser::skip_over_field_signature(char* signature,
5232 bool void_ok,
5233 unsigned int length,
5234 TRAPS) {
5235 unsigned int array_dim = 0;
5236 while (length > 0) {
5237 switch (signature[0]) {
5238 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5239 case JVM_SIGNATURE_BOOLEAN:
5240 case JVM_SIGNATURE_BYTE:
5241 case JVM_SIGNATURE_CHAR:
5242 case JVM_SIGNATURE_SHORT:
5243 case JVM_SIGNATURE_INT:
5244 case JVM_SIGNATURE_FLOAT:
5245 case JVM_SIGNATURE_LONG:
5246 case JVM_SIGNATURE_DOUBLE:
5247 return signature + 1;
5248 case JVM_SIGNATURE_CLASS: {
5249 if (_major_version < JAVA_1_5_VERSION) {
5250 // Skip over the class name if one is there
5251 char* p = skip_over_field_name(signature + 1, true, --length);
5252
5253 // The next character better be a semicolon
5254 if (p && (p - signature) > 1 && p[0] == ';') {
5255 return p + 1;
5256 }
5257 } else {
5258 // 4900761: For class version > 48, any unicode is allowed in class name.
5259 length--;
5260 signature++;
5261 while (length > 0 && signature[0] != ';') {
5262 if (signature[0] == '.') {
5263 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5264 }
5265 length--;
5266 signature++;
5267 }
5268 if (signature[0] == ';') { return signature + 1; }
5269 }
5270
5271 return NULL;
5272 }
5273 case JVM_SIGNATURE_ARRAY:
5274 array_dim++;
5275 if (array_dim > 255) {
5276 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5277 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5278 }
5279 // The rest of what's there better be a legal signature
5280 signature++;
5281 length--;
5282 void_ok = false;
5283 break;
5284
5285 default:
5286 return NULL;
5287 }
5288 }
5289 return NULL;
5290 }