1 /*
2 * Copyright (c) 1998, 2019, 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 "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stackMapTable.hpp"
31 #include "classfile/stackMapFrame.hpp"
32 #include "classfile/stackMapTableFormat.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/verifier.hpp"
36 #include "classfile/vmSymbols.hpp"
37 #include "interpreter/bytecodes.hpp"
38 #include "interpreter/bytecodeStream.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/constantPool.inline.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/typeArrayOop.hpp"
48 #include "runtime/fieldDescriptor.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/interfaceSupport.inline.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/jniHandles.inline.hpp"
53 #include "runtime/orderAccess.hpp"
54 #include "runtime/os.hpp"
55 #include "runtime/safepointVerifiers.hpp"
56 #include "runtime/thread.hpp"
57 #include "services/threadService.hpp"
58 #include "utilities/align.hpp"
59 #include "utilities/bytes.hpp"
60
61 #define NOFAILOVER_MAJOR_VERSION 51
62 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
63 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
64 #define VALUETYPE_MAJOR_VERSION 56
65 #define MAX_ARRAY_DIMENSIONS 255
66
67 // Access to external entry for VerifyClassCodes - old byte code verifier
68
69 extern "C" {
70 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
71 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
72 }
73
74 static void* volatile _verify_byte_codes_fn = NULL;
75
76 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
77
78 static void* verify_byte_codes_fn() {
79 if (OrderAccess::load_acquire(&_verify_byte_codes_fn) == NULL) {
80 void *lib_handle = os::native_java_library();
81 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
82 OrderAccess::release_store(&_verify_byte_codes_fn, func);
83 if (func == NULL) {
84 _is_new_verify_byte_codes_fn = false;
85 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
86 OrderAccess::release_store(&_verify_byte_codes_fn, func);
87 }
88 }
89 return (void*)_verify_byte_codes_fn;
90 }
91
92
93 // Methods in Verifier
94
95 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
96 return (class_loader == NULL || !should_verify_class) ?
97 BytecodeVerificationLocal : BytecodeVerificationRemote;
98 }
99
100 bool Verifier::relax_access_for(oop loader) {
101 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
102 bool need_verify =
103 // verifyAll
104 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
105 // verifyRemote
106 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
107 return !need_verify;
108 }
109
110 void Verifier::trace_class_resolution(Klass* resolve_class, InstanceKlass* verify_class) {
111 assert(verify_class != NULL, "Unexpected null verify_class");
112 ResourceMark rm;
113 Symbol* s = verify_class->source_file_name();
114 const char* source_file = (s != NULL ? s->as_C_string() : NULL);
115 const char* verify = verify_class->external_name();
116 const char* resolve = resolve_class->external_name();
117 // print in a single call to reduce interleaving between threads
118 if (source_file != NULL) {
119 log_debug(class, resolve)("%s %s %s (verification)", verify, resolve, source_file);
120 } else {
121 log_debug(class, resolve)("%s %s (verification)", verify, resolve);
122 }
123 }
124
125 // Prints the end-verification message to the appropriate output.
126 void Verifier::log_end_verification(outputStream* st, const char* klassName, Symbol* exception_name, TRAPS) {
127 if (HAS_PENDING_EXCEPTION) {
128 st->print("Verification for %s has", klassName);
129 st->print_cr(" exception pending %s ",
130 PENDING_EXCEPTION->klass()->external_name());
131 } else if (exception_name != NULL) {
132 st->print_cr("Verification for %s failed", klassName);
133 }
134 st->print_cr("End class verification for: %s", klassName);
135 }
136
137 bool Verifier::verify(InstanceKlass* klass, bool should_verify_class, TRAPS) {
138 HandleMark hm(THREAD);
139 ResourceMark rm(THREAD);
140
141 // Eagerly allocate the identity hash code for a klass. This is a fallout
142 // from 6320749 and 8059924: hash code generator is not supposed to be called
143 // during the safepoint, but it allows to sneak the hashcode in during
144 // verification. Without this eager hashcode generation, we may end up
145 // installing the hashcode during some other operation, which may be at
146 // safepoint -- blowing up the checks. It was previously done as the side
147 // effect (sic!) for external_name(), but instead of doing that, we opt to
148 // explicitly push the hashcode in here. This is signify the following block
149 // is IMPORTANT:
150 if (klass->java_mirror() != NULL) {
151 klass->java_mirror()->identity_hash();
152 }
153
154 if (!is_eligible_for_verification(klass, should_verify_class)) {
155 return true;
156 }
157
158 // Timer includes any side effects of class verification (resolution,
159 // etc), but not recursive calls to Verifier::verify().
160 JavaThread* jt = (JavaThread*)THREAD;
161 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(),
162 ClassLoader::perf_class_verify_selftime(),
163 ClassLoader::perf_classes_verified(),
164 jt->get_thread_stat()->perf_recursion_counts_addr(),
165 jt->get_thread_stat()->perf_timers_addr(),
166 PerfClassTraceTime::CLASS_VERIFY);
167
168 // If the class should be verified, first see if we can use the split
169 // verifier. If not, or if verification fails and can failover, then
170 // call the inference verifier.
171 Symbol* exception_name = NULL;
172 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
173 char* message_buffer = NULL;
174 char* exception_message = NULL;
175
176 log_info(class, init)("Start class verification for: %s", klass->external_name());
177 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
178 ClassVerifier split_verifier(klass, THREAD);
179 split_verifier.verify_class(THREAD);
180 exception_name = split_verifier.result();
181
182 // If DumpSharedSpaces is set then don't fall back to the old verifier on
183 // verification failure. If a class fails verification with the split verifier,
184 // it might fail the CDS runtime verifier constraint check. In that case, we
185 // don't want to share the class. We only archive classes that pass the split
186 // verifier.
187 bool can_failover = !DumpSharedSpaces &&
188 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
189
190 if (can_failover && !HAS_PENDING_EXCEPTION && // Split verifier doesn't set PENDING_EXCEPTION for failure
191 (exception_name == vmSymbols::java_lang_VerifyError() ||
192 exception_name == vmSymbols::java_lang_ClassFormatError())) {
193 log_info(verification)("Fail over class verification to old verifier for: %s", klass->external_name());
194 log_info(class, init)("Fail over class verification to old verifier for: %s", klass->external_name());
195 message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
196 exception_message = message_buffer;
197 exception_name = inference_verify(
198 klass, message_buffer, message_buffer_len, THREAD);
199 }
200 if (exception_name != NULL) {
201 exception_message = split_verifier.exception_message();
202 }
203 } else {
204 message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
205 exception_message = message_buffer;
206 exception_name = inference_verify(
207 klass, message_buffer, message_buffer_len, THREAD);
208 }
209
210 LogTarget(Info, class, init) lt1;
211 if (lt1.is_enabled()) {
212 LogStream ls(lt1);
213 log_end_verification(&ls, klass->external_name(), exception_name, THREAD);
214 }
215 LogTarget(Info, verification) lt2;
216 if (lt2.is_enabled()) {
217 LogStream ls(lt2);
218 log_end_verification(&ls, klass->external_name(), exception_name, THREAD);
219 }
220
221 if (HAS_PENDING_EXCEPTION) {
222 return false; // use the existing exception
223 } else if (exception_name == NULL) {
224 return true; // verification succeeded
225 } else { // VerifyError or ClassFormatError to be created and thrown
226 Klass* kls =
227 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
228 if (log_is_enabled(Debug, class, resolve)) {
229 Verifier::trace_class_resolution(kls, klass);
230 }
231
232 while (kls != NULL) {
233 if (kls == klass) {
234 // If the class being verified is the exception we're creating
235 // or one of it's superclasses, we're in trouble and are going
236 // to infinitely recurse when we try to initialize the exception.
237 // So bail out here by throwing the preallocated VM error.
238 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
239 }
240 kls = kls->super();
241 }
242 if (message_buffer != NULL) {
243 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
244 }
245 assert(exception_message != NULL, "");
246 THROW_MSG_(exception_name, exception_message, false);
247 }
248 }
249
250 bool Verifier::is_eligible_for_verification(InstanceKlass* klass, bool should_verify_class) {
251 Symbol* name = klass->name();
252 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
253
254 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
255
256 return (should_verify_for(klass->class_loader(), should_verify_class) &&
257 // return if the class is a bootstrapping class
258 // or defineClass specified not to verify by default (flags override passed arg)
259 // We need to skip the following four for bootstrapping
260 name != vmSymbols::java_lang_Object() &&
261 name != vmSymbols::java_lang_Class() &&
262 name != vmSymbols::java_lang_String() &&
263 name != vmSymbols::java_lang_Throwable() &&
264
265 // Can not verify the bytecodes for shared classes because they have
266 // already been rewritten to contain constant pool cache indices,
267 // which the verifier can't understand.
268 // Shared classes shouldn't have stackmaps either.
269 !klass->is_shared() &&
270
271 // As of the fix for 4486457 we disable verification for all of the
272 // dynamically-generated bytecodes associated with the 1.4
273 // reflection implementation, not just those associated with
274 // jdk/internal/reflect/SerializationConstructorAccessor.
275 // NOTE: this is called too early in the bootstrapping process to be
276 // guarded by Universe::is_gte_jdk14x_version().
277 // Also for lambda generated code, gte jdk8
278 (!is_reflect));
279 }
280
281 Symbol* Verifier::inference_verify(
282 InstanceKlass* klass, char* message, size_t message_len, TRAPS) {
283 JavaThread* thread = (JavaThread*)THREAD;
284 JNIEnv *env = thread->jni_environment();
285
286 void* verify_func = verify_byte_codes_fn();
287
288 if (verify_func == NULL) {
289 jio_snprintf(message, message_len, "Could not link verifier");
290 return vmSymbols::java_lang_VerifyError();
291 }
292
293 ResourceMark rm(THREAD);
294 log_info(verification)("Verifying class %s with old format", klass->external_name());
295
296 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
297 jint result;
298
299 {
300 HandleMark hm(thread);
301 ThreadToNativeFromVM ttn(thread);
302 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
303 // code knows that we have left the VM
304
305 if (_is_new_verify_byte_codes_fn) {
306 verify_byte_codes_fn_new_t func =
307 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
308 result = (*func)(env, cls, message, (int)message_len,
309 klass->major_version());
310 } else {
311 verify_byte_codes_fn_t func =
312 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
313 result = (*func)(env, cls, message, (int)message_len);
314 }
315 }
316
317 JNIHandles::destroy_local(cls);
318
319 // These numbers are chosen so that VerifyClassCodes interface doesn't need
320 // to be changed (still return jboolean (unsigned char)), and result is
321 // 1 when verification is passed.
322 if (result == 0) {
323 return vmSymbols::java_lang_VerifyError();
324 } else if (result == 1) {
325 return NULL; // verified.
326 } else if (result == 2) {
327 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
328 } else if (result == 3) {
329 return vmSymbols::java_lang_ClassFormatError();
330 } else {
331 ShouldNotReachHere();
332 return NULL;
333 }
334 }
335
336 TypeOrigin TypeOrigin::null() {
337 return TypeOrigin();
338 }
339 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
340 assert(frame != NULL, "Must have a frame");
341 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
342 frame->local_at(index));
343 }
344 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
345 assert(frame != NULL, "Must have a frame");
346 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
347 frame->stack_at(index));
348 }
349 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
350 assert(frame != NULL, "Must have a frame");
351 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
352 frame->local_at(index));
353 }
354 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
355 assert(frame != NULL, "Must have a frame");
356 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
357 frame->stack_at(index));
358 }
359 TypeOrigin TypeOrigin::bad_index(u2 index) {
360 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
361 }
362 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
363 return TypeOrigin(CONST_POOL, index, NULL, vt);
364 }
365 TypeOrigin TypeOrigin::signature(VerificationType vt) {
366 return TypeOrigin(SIG, 0, NULL, vt);
367 }
368 TypeOrigin TypeOrigin::implicit(VerificationType t) {
369 return TypeOrigin(IMPLICIT, 0, NULL, t);
370 }
371 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
372 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
373 VerificationType::bogus_type());
374 }
375
376 void TypeOrigin::reset_frame() {
377 if (_frame != NULL) {
378 _frame->restore();
379 }
380 }
381
382 void TypeOrigin::details(outputStream* ss) const {
383 _type.print_on(ss);
384 switch (_origin) {
385 case CF_LOCALS:
386 ss->print(" (current frame, locals[%d])", _index);
387 break;
388 case CF_STACK:
389 ss->print(" (current frame, stack[%d])", _index);
390 break;
391 case SM_LOCALS:
392 ss->print(" (stack map, locals[%d])", _index);
393 break;
394 case SM_STACK:
395 ss->print(" (stack map, stack[%d])", _index);
396 break;
397 case CONST_POOL:
398 ss->print(" (constant pool %d)", _index);
399 break;
400 case SIG:
401 ss->print(" (from method signature)");
402 break;
403 case IMPLICIT:
404 case FRAME_ONLY:
405 case NONE:
406 default:
407 ;
408 }
409 }
410
411 #ifdef ASSERT
412 void TypeOrigin::print_on(outputStream* str) const {
413 str->print("{%d,%d,%p:", _origin, _index, _frame);
414 if (_frame != NULL) {
415 _frame->print_on(str);
416 } else {
417 str->print("null");
418 }
419 str->print(",");
420 _type.print_on(str);
421 str->print("}");
422 }
423 #endif
424
425 void ErrorContext::details(outputStream* ss, const Method* method) const {
426 if (is_valid()) {
427 ss->cr();
428 ss->print_cr("Exception Details:");
429 location_details(ss, method);
430 reason_details(ss);
431 frame_details(ss);
432 bytecode_details(ss, method);
433 handler_details(ss, method);
434 stackmap_details(ss, method);
435 }
436 }
437
438 void ErrorContext::reason_details(outputStream* ss) const {
439 streamIndentor si(ss);
440 ss->indent().print_cr("Reason:");
441 streamIndentor si2(ss);
442 ss->indent().print("%s", "");
443 switch (_fault) {
444 case INVALID_BYTECODE:
445 ss->print("Error exists in the bytecode");
446 break;
447 case WRONG_TYPE:
448 if (_expected.is_valid()) {
449 ss->print("Type ");
450 _type.details(ss);
451 ss->print(" is not assignable to ");
452 _expected.details(ss);
453 } else {
454 ss->print("Invalid type: ");
455 _type.details(ss);
456 }
457 break;
458 case FLAGS_MISMATCH:
459 if (_expected.is_valid()) {
460 ss->print("Current frame's flags are not assignable "
461 "to stack map frame's.");
462 } else {
463 ss->print("Current frame's flags are invalid in this context.");
464 }
465 break;
466 case BAD_CP_INDEX:
467 ss->print("Constant pool index %d is invalid", _type.index());
468 break;
469 case BAD_LOCAL_INDEX:
470 ss->print("Local index %d is invalid", _type.index());
471 break;
472 case LOCALS_SIZE_MISMATCH:
473 ss->print("Current frame's local size doesn't match stackmap.");
474 break;
475 case STACK_SIZE_MISMATCH:
476 ss->print("Current frame's stack size doesn't match stackmap.");
477 break;
478 case STACK_OVERFLOW:
479 ss->print("Exceeded max stack size.");
480 break;
481 case STACK_UNDERFLOW:
482 ss->print("Attempt to pop empty stack.");
483 break;
484 case MISSING_STACKMAP:
485 ss->print("Expected stackmap frame at this location.");
486 break;
487 case BAD_STACKMAP:
488 ss->print("Invalid stackmap specification.");
489 break;
490 case WRONG_VALUE_TYPE:
491 ss->print("Type ");
492 _type.details(ss);
493 ss->print(" and type ");
494 _expected.details(ss);
495 ss->print(" must be identical inline types.");
496 break;
497 case UNKNOWN:
498 default:
499 ShouldNotReachHere();
500 ss->print_cr("Unknown");
501 }
502 ss->cr();
503 }
504
505 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
506 if (_bci != -1 && method != NULL) {
507 streamIndentor si(ss);
508 const char* bytecode_name = "<invalid>";
509 if (method->validate_bci(_bci) != -1) {
510 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
511 if (Bytecodes::is_defined(code)) {
512 bytecode_name = Bytecodes::name(code);
513 } else {
514 bytecode_name = "<illegal>";
515 }
516 }
517 InstanceKlass* ik = method->method_holder();
518 ss->indent().print_cr("Location:");
519 streamIndentor si2(ss);
520 ss->indent().print_cr("%s.%s%s @%d: %s",
521 ik->name()->as_C_string(), method->name()->as_C_string(),
522 method->signature()->as_C_string(), _bci, bytecode_name);
523 }
524 }
525
526 void ErrorContext::frame_details(outputStream* ss) const {
527 streamIndentor si(ss);
528 if (_type.is_valid() && _type.frame() != NULL) {
529 ss->indent().print_cr("Current Frame:");
530 streamIndentor si2(ss);
531 _type.frame()->print_on(ss);
532 }
533 if (_expected.is_valid() && _expected.frame() != NULL) {
534 ss->indent().print_cr("Stackmap Frame:");
535 streamIndentor si2(ss);
536 _expected.frame()->print_on(ss);
537 }
538 }
539
540 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
541 if (method != NULL) {
542 streamIndentor si(ss);
543 ss->indent().print_cr("Bytecode:");
544 streamIndentor si2(ss);
545 ss->print_data(method->code_base(), method->code_size(), false);
546 }
547 }
548
549 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
550 if (method != NULL) {
551 streamIndentor si(ss);
552 ExceptionTable table(method);
553 if (table.length() > 0) {
554 ss->indent().print_cr("Exception Handler Table:");
555 streamIndentor si2(ss);
556 for (int i = 0; i < table.length(); ++i) {
557 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
558 table.end_pc(i), table.handler_pc(i));
559 }
560 }
561 }
562 }
563
564 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
565 if (method != NULL && method->has_stackmap_table()) {
566 streamIndentor si(ss);
567 ss->indent().print_cr("Stackmap Table:");
568 Array<u1>* data = method->stackmap_data();
569 stack_map_table* sm_table =
570 stack_map_table::at((address)data->adr_at(0));
571 stack_map_frame* sm_frame = sm_table->entries();
572 streamIndentor si2(ss);
573 int current_offset = -1;
574 address end_of_sm_table = (address)sm_table + method->stackmap_data()->length();
575 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
576 ss->indent();
577 if (!sm_frame->verify((address)sm_frame, end_of_sm_table)) {
578 sm_frame->print_truncated(ss, current_offset);
579 return;
580 }
581 sm_frame->print_on(ss, current_offset);
582 ss->cr();
583 current_offset += sm_frame->offset_delta();
584 sm_frame = sm_frame->next();
585 }
586 }
587 }
588
589 // Methods in ClassVerifier
590
591 VerificationType reference_or_valuetype(InstanceKlass* klass) {
592 if (klass->is_value()) {
593 return VerificationType::valuetype_type(klass->name());
594 } else {
595 return VerificationType::reference_type(klass->name());
596 }
597 }
598
599 ClassVerifier::ClassVerifier(
600 InstanceKlass* klass, TRAPS)
601 : _thread(THREAD), _previous_symbol(NULL), _symbols(NULL), _exception_type(NULL),
602 _message(NULL), _method_signatures_table(NULL), _klass(klass) {
603 _this_type = reference_or_valuetype(klass);
604 }
605
606 ClassVerifier::~ClassVerifier() {
607 // Decrement the reference count for any symbols created.
608 if (_symbols != NULL) {
609 for (int i = 0; i < _symbols->length(); i++) {
610 Symbol* s = _symbols->at(i);
611 s->decrement_refcount();
612 }
613 }
614 }
615
616 VerificationType ClassVerifier::object_type() const {
617 return VerificationType::reference_type(vmSymbols::java_lang_Object());
618 }
619
620 TypeOrigin ClassVerifier::ref_ctx(const char* sig) {
621 VerificationType vt = VerificationType::reference_type(
622 create_temporary_symbol(sig, (int)strlen(sig)));
623 return TypeOrigin::implicit(vt);
624 }
625
626 void ClassVerifier::verify_class(TRAPS) {
627 log_info(verification)("Verifying class %s with new format", _klass->external_name());
628
629 // Either verifying both local and remote classes or just remote classes.
630 assert(BytecodeVerificationRemote, "Should not be here");
631
632 // Create hash table containing method signatures.
633 method_signatures_table_type method_signatures_table;
634 set_method_signatures_table(&method_signatures_table);
635
636 Array<Method*>* methods = _klass->methods();
637 int num_methods = methods->length();
638
639 for (int index = 0; index < num_methods; index++) {
640 // Check for recursive re-verification before each method.
641 if (was_recursively_verified()) return;
642
643 Method* m = methods->at(index);
644 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
645 // If m is native or abstract, skip it. It is checked in class file
646 // parser that methods do not override a final method. Overpass methods
647 // are trusted since the VM generates them.
648 continue;
649 }
650 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
651 }
652
653 if (was_recursively_verified()){
654 log_info(verification)("Recursive verification detected for: %s", _klass->external_name());
655 log_info(class, init)("Recursive verification detected for: %s",
656 _klass->external_name());
657 }
658 }
659
660 // Translate the signature entries into verification types and save them in
661 // the growable array. Also, save the count of arguments.
662 void ClassVerifier::translate_signature(Symbol* const method_sig,
663 sig_as_verification_types* sig_verif_types,
664 TRAPS) {
665 SignatureStream sig_stream(method_sig);
666 VerificationType sig_type[2];
667 int sig_i = 0;
668 GrowableArray<VerificationType>* verif_types = sig_verif_types->sig_verif_types();
669
670 // Translate the signature arguments into verification types.
671 while (!sig_stream.at_return_type()) {
672 int n = change_sig_to_verificationType(&sig_stream, sig_type);
673 assert(n <= 2, "Unexpected signature type");
674
675 // Store verification type(s). Longs and Doubles each have two verificationTypes.
676 for (int x = 0; x < n; x++) {
677 verif_types->push(sig_type[x]);
678 }
679 sig_i += n;
680 sig_stream.next();
681 }
682
683 // Set final arg count, not including the return type. The final arg count will
684 // be compared with sig_verify_types' length to see if there is a return type.
685 sig_verif_types->set_num_args(sig_i);
686
687 // Store verification type(s) for the return type, if there is one.
688 if (sig_stream.type() != T_VOID) {
689 int n = change_sig_to_verificationType(&sig_stream, sig_type);
690 assert(n <= 2, "Unexpected signature return type");
691 for (int y = 0; y < n; y++) {
692 verif_types->push(sig_type[y]);
693 }
694 }
695 }
696
697 void ClassVerifier::create_method_sig_entry(sig_as_verification_types* sig_verif_types,
698 int sig_index, TRAPS) {
699 // Translate the signature into verification types.
700 ConstantPool* cp = _klass->constants();
701 Symbol* const method_sig = cp->symbol_at(sig_index);
702 translate_signature(method_sig, sig_verif_types, CHECK_VERIFY(this));
703
704 // Add the list of this signature's verification types to the table.
705 bool is_unique = method_signatures_table()->put(sig_index, sig_verif_types);
706 assert(is_unique, "Duplicate entries in method_signature_table");
707 }
708
709 void ClassVerifier::verify_method(const methodHandle& m, TRAPS) {
710 HandleMark hm(THREAD);
711 _method = m; // initialize _method
712 log_info(verification)("Verifying method %s", m->name_and_sig_as_C_string());
713
714 // For clang, the only good constant format string is a literal constant format string.
715 #define bad_type_msg "Bad type on operand stack in %s"
716
717 int32_t max_stack = m->verifier_max_stack();
718 int32_t max_locals = m->max_locals();
719 constantPoolHandle cp(THREAD, m->constants());
720
721 // Method signature was checked in ClassFileParser.
722 assert(SignatureVerifier::is_valid_method_signature(m->signature()),
723 "Invalid method signature");
724
725 // Initial stack map frame: offset is 0, stack is initially empty.
726 StackMapFrame current_frame(max_locals, max_stack, this);
727 // Set initial locals
728 VerificationType return_type = current_frame.set_locals_from_arg(
729 m, current_type(), CHECK_VERIFY(this));
730
731 int32_t stackmap_index = 0; // index to the stackmap array
732
733 u4 code_length = m->code_size();
734
735 // Scan the bytecode and map each instruction's start offset to a number.
736 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
737
738 int ex_min = code_length;
739 int ex_max = -1;
740 // Look through each item on the exception table. Each of the fields must refer
741 // to a legal instruction.
742 if (was_recursively_verified()) return;
743 verify_exception_handler_table(
744 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
745
746 // Look through each entry on the local variable table and make sure
747 // its range of code array offsets is valid. (4169817)
748 if (m->has_localvariable_table()) {
749 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
750 }
751
752 Array<u1>* stackmap_data = m->stackmap_data();
753 StackMapStream stream(stackmap_data);
754 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
755 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
756 code_data, code_length, CHECK_VERIFY(this));
757
758 LogTarget(Info, verification) lt;
759 if (lt.is_enabled()) {
760 ResourceMark rm(THREAD);
761 LogStream ls(lt);
762 stackmap_table.print_on(&ls);
763 }
764
765 RawBytecodeStream bcs(m);
766
767 // Scan the byte code linearly from the start to the end
768 bool no_control_flow = false; // Set to true when there is no direct control
769 // flow from current instruction to the next
770 // instruction in sequence
771
772 Bytecodes::Code opcode;
773 while (!bcs.is_last_bytecode()) {
774 // Check for recursive re-verification before each bytecode.
775 if (was_recursively_verified()) return;
776
777 opcode = bcs.raw_next();
778 u2 bci = bcs.bci();
779
780 // Set current frame's offset to bci
781 current_frame.set_offset(bci);
782 current_frame.set_mark();
783
784 // Make sure every offset in stackmap table point to the beginning to
785 // an instruction. Match current_frame to stackmap_table entry with
786 // the same offset if exists.
787 stackmap_index = verify_stackmap_table(
788 stackmap_index, bci, ¤t_frame, &stackmap_table,
789 no_control_flow, CHECK_VERIFY(this));
790
791
792 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
793 bool verified_exc_handlers = false;
794
795 // Merge with the next instruction
796 {
797 u2 index;
798 int target;
799 VerificationType type, type2;
800 VerificationType atype;
801
802 LogTarget(Info, verification) lt;
803 if (lt.is_enabled()) {
804 ResourceMark rm(THREAD);
805 LogStream ls(lt);
806 current_frame.print_on(&ls);
807 lt.print("offset = %d, opcode = %s", bci,
808 opcode == Bytecodes::_illegal ? "illegal" : Bytecodes::name(opcode));
809 }
810
811 // Make sure wide instruction is in correct format
812 if (bcs.is_wide()) {
813 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
814 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
815 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
816 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
817 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
818 opcode != Bytecodes::_dstore) {
819 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
820 * if we encounter a wide instruction that modifies an invalid
821 * opcode (not one of the ones listed above) */
822 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
823 return;
824 }
825 }
826
827 // Look for possible jump target in exception handlers and see if it
828 // matches current_frame. Do this check here for astore*, dstore*,
829 // fstore*, istore*, and lstore* opcodes because they can change the type
830 // state by adding a local. JVM Spec says that the incoming type state
831 // should be used for this check. So, do the check here before a possible
832 // local is added to the type state.
833 if (Bytecodes::is_store_into_local(opcode) && bci >= ex_min && bci < ex_max) {
834 if (was_recursively_verified()) return;
835 verify_exception_handler_targets(
836 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
837 verified_exc_handlers = true;
838 }
839
840 if (was_recursively_verified()) return;
841
842 switch (opcode) {
843 case Bytecodes::_nop :
844 no_control_flow = false; break;
845 case Bytecodes::_aconst_null :
846 current_frame.push_stack(
847 VerificationType::null_type(), CHECK_VERIFY(this));
848 no_control_flow = false; break;
849 case Bytecodes::_iconst_m1 :
850 case Bytecodes::_iconst_0 :
851 case Bytecodes::_iconst_1 :
852 case Bytecodes::_iconst_2 :
853 case Bytecodes::_iconst_3 :
854 case Bytecodes::_iconst_4 :
855 case Bytecodes::_iconst_5 :
856 current_frame.push_stack(
857 VerificationType::integer_type(), CHECK_VERIFY(this));
858 no_control_flow = false; break;
859 case Bytecodes::_lconst_0 :
860 case Bytecodes::_lconst_1 :
861 current_frame.push_stack_2(
862 VerificationType::long_type(),
863 VerificationType::long2_type(), CHECK_VERIFY(this));
864 no_control_flow = false; break;
865 case Bytecodes::_fconst_0 :
866 case Bytecodes::_fconst_1 :
867 case Bytecodes::_fconst_2 :
868 current_frame.push_stack(
869 VerificationType::float_type(), CHECK_VERIFY(this));
870 no_control_flow = false; break;
871 case Bytecodes::_dconst_0 :
872 case Bytecodes::_dconst_1 :
873 current_frame.push_stack_2(
874 VerificationType::double_type(),
875 VerificationType::double2_type(), CHECK_VERIFY(this));
876 no_control_flow = false; break;
877 case Bytecodes::_sipush :
878 case Bytecodes::_bipush :
879 current_frame.push_stack(
880 VerificationType::integer_type(), CHECK_VERIFY(this));
881 no_control_flow = false; break;
882 case Bytecodes::_ldc :
883 verify_ldc(
884 opcode, bcs.get_index_u1(), ¤t_frame,
885 cp, bci, CHECK_VERIFY(this));
886 no_control_flow = false; break;
887 case Bytecodes::_ldc_w :
888 case Bytecodes::_ldc2_w :
889 verify_ldc(
890 opcode, bcs.get_index_u2(), ¤t_frame,
891 cp, bci, CHECK_VERIFY(this));
892 no_control_flow = false; break;
893 case Bytecodes::_iload :
894 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
895 no_control_flow = false; break;
896 case Bytecodes::_iload_0 :
897 case Bytecodes::_iload_1 :
898 case Bytecodes::_iload_2 :
899 case Bytecodes::_iload_3 :
900 index = opcode - Bytecodes::_iload_0;
901 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
902 no_control_flow = false; break;
903 case Bytecodes::_lload :
904 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
905 no_control_flow = false; break;
906 case Bytecodes::_lload_0 :
907 case Bytecodes::_lload_1 :
908 case Bytecodes::_lload_2 :
909 case Bytecodes::_lload_3 :
910 index = opcode - Bytecodes::_lload_0;
911 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
912 no_control_flow = false; break;
913 case Bytecodes::_fload :
914 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
915 no_control_flow = false; break;
916 case Bytecodes::_fload_0 :
917 case Bytecodes::_fload_1 :
918 case Bytecodes::_fload_2 :
919 case Bytecodes::_fload_3 :
920 index = opcode - Bytecodes::_fload_0;
921 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
922 no_control_flow = false; break;
923 case Bytecodes::_dload :
924 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
925 no_control_flow = false; break;
926 case Bytecodes::_dload_0 :
927 case Bytecodes::_dload_1 :
928 case Bytecodes::_dload_2 :
929 case Bytecodes::_dload_3 :
930 index = opcode - Bytecodes::_dload_0;
931 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
932 no_control_flow = false; break;
933 case Bytecodes::_aload :
934 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
935 no_control_flow = false; break;
936 case Bytecodes::_aload_0 :
937 case Bytecodes::_aload_1 :
938 case Bytecodes::_aload_2 :
939 case Bytecodes::_aload_3 :
940 index = opcode - Bytecodes::_aload_0;
941 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
942 no_control_flow = false; break;
943 case Bytecodes::_iaload :
944 type = current_frame.pop_stack(
945 VerificationType::integer_type(), CHECK_VERIFY(this));
946 atype = current_frame.pop_stack(
947 VerificationType::reference_check(), CHECK_VERIFY(this));
948 if (!atype.is_int_array()) {
949 verify_error(ErrorContext::bad_type(bci,
950 current_frame.stack_top_ctx(), ref_ctx("[I")),
951 bad_type_msg, "iaload");
952 return;
953 }
954 current_frame.push_stack(
955 VerificationType::integer_type(), CHECK_VERIFY(this));
956 no_control_flow = false; break;
957 case Bytecodes::_baload :
958 type = current_frame.pop_stack(
959 VerificationType::integer_type(), CHECK_VERIFY(this));
960 atype = current_frame.pop_stack(
961 VerificationType::reference_check(), CHECK_VERIFY(this));
962 if (!atype.is_bool_array() && !atype.is_byte_array()) {
963 verify_error(
964 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
965 bad_type_msg, "baload");
966 return;
967 }
968 current_frame.push_stack(
969 VerificationType::integer_type(), CHECK_VERIFY(this));
970 no_control_flow = false; break;
971 case Bytecodes::_caload :
972 type = current_frame.pop_stack(
973 VerificationType::integer_type(), CHECK_VERIFY(this));
974 atype = current_frame.pop_stack(
975 VerificationType::reference_check(), CHECK_VERIFY(this));
976 if (!atype.is_char_array()) {
977 verify_error(ErrorContext::bad_type(bci,
978 current_frame.stack_top_ctx(), ref_ctx("[C")),
979 bad_type_msg, "caload");
980 return;
981 }
982 current_frame.push_stack(
983 VerificationType::integer_type(), CHECK_VERIFY(this));
984 no_control_flow = false; break;
985 case Bytecodes::_saload :
986 type = current_frame.pop_stack(
987 VerificationType::integer_type(), CHECK_VERIFY(this));
988 atype = current_frame.pop_stack(
989 VerificationType::reference_check(), CHECK_VERIFY(this));
990 if (!atype.is_short_array()) {
991 verify_error(ErrorContext::bad_type(bci,
992 current_frame.stack_top_ctx(), ref_ctx("[S")),
993 bad_type_msg, "saload");
994 return;
995 }
996 current_frame.push_stack(
997 VerificationType::integer_type(), CHECK_VERIFY(this));
998 no_control_flow = false; break;
999 case Bytecodes::_laload :
1000 type = current_frame.pop_stack(
1001 VerificationType::integer_type(), CHECK_VERIFY(this));
1002 atype = current_frame.pop_stack(
1003 VerificationType::reference_check(), CHECK_VERIFY(this));
1004 if (!atype.is_long_array()) {
1005 verify_error(ErrorContext::bad_type(bci,
1006 current_frame.stack_top_ctx(), ref_ctx("[J")),
1007 bad_type_msg, "laload");
1008 return;
1009 }
1010 current_frame.push_stack_2(
1011 VerificationType::long_type(),
1012 VerificationType::long2_type(), CHECK_VERIFY(this));
1013 no_control_flow = false; break;
1014 case Bytecodes::_faload :
1015 type = current_frame.pop_stack(
1016 VerificationType::integer_type(), CHECK_VERIFY(this));
1017 atype = current_frame.pop_stack(
1018 VerificationType::reference_check(), CHECK_VERIFY(this));
1019 if (!atype.is_float_array()) {
1020 verify_error(ErrorContext::bad_type(bci,
1021 current_frame.stack_top_ctx(), ref_ctx("[F")),
1022 bad_type_msg, "faload");
1023 return;
1024 }
1025 current_frame.push_stack(
1026 VerificationType::float_type(), CHECK_VERIFY(this));
1027 no_control_flow = false; break;
1028 case Bytecodes::_daload :
1029 type = current_frame.pop_stack(
1030 VerificationType::integer_type(), CHECK_VERIFY(this));
1031 atype = current_frame.pop_stack(
1032 VerificationType::reference_check(), CHECK_VERIFY(this));
1033 if (!atype.is_double_array()) {
1034 verify_error(ErrorContext::bad_type(bci,
1035 current_frame.stack_top_ctx(), ref_ctx("[D")),
1036 bad_type_msg, "daload");
1037 return;
1038 }
1039 current_frame.push_stack_2(
1040 VerificationType::double_type(),
1041 VerificationType::double2_type(), CHECK_VERIFY(this));
1042 no_control_flow = false; break;
1043 case Bytecodes::_aaload : {
1044 type = current_frame.pop_stack(
1045 VerificationType::integer_type(), CHECK_VERIFY(this));
1046 atype = current_frame.pop_stack(
1047 VerificationType::reference_check(), CHECK_VERIFY(this));
1048 if (!atype.is_nonscalar_array()) {
1049 verify_error(ErrorContext::bad_type(bci,
1050 current_frame.stack_top_ctx(),
1051 TypeOrigin::implicit(VerificationType::reference_check())),
1052 bad_type_msg, "aaload");
1053 return;
1054 }
1055 if (atype.is_null()) {
1056 current_frame.push_stack(
1057 VerificationType::null_type(), CHECK_VERIFY(this));
1058 } else {
1059 VerificationType component =
1060 atype.get_component(this, CHECK_VERIFY(this));
1061 current_frame.push_stack(component, CHECK_VERIFY(this));
1062 }
1063 no_control_flow = false; break;
1064 }
1065 case Bytecodes::_istore :
1066 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1067 no_control_flow = false; break;
1068 case Bytecodes::_istore_0 :
1069 case Bytecodes::_istore_1 :
1070 case Bytecodes::_istore_2 :
1071 case Bytecodes::_istore_3 :
1072 index = opcode - Bytecodes::_istore_0;
1073 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
1074 no_control_flow = false; break;
1075 case Bytecodes::_lstore :
1076 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1077 no_control_flow = false; break;
1078 case Bytecodes::_lstore_0 :
1079 case Bytecodes::_lstore_1 :
1080 case Bytecodes::_lstore_2 :
1081 case Bytecodes::_lstore_3 :
1082 index = opcode - Bytecodes::_lstore_0;
1083 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
1084 no_control_flow = false; break;
1085 case Bytecodes::_fstore :
1086 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1087 no_control_flow = false; break;
1088 case Bytecodes::_fstore_0 :
1089 case Bytecodes::_fstore_1 :
1090 case Bytecodes::_fstore_2 :
1091 case Bytecodes::_fstore_3 :
1092 index = opcode - Bytecodes::_fstore_0;
1093 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
1094 no_control_flow = false; break;
1095 case Bytecodes::_dstore :
1096 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1097 no_control_flow = false; break;
1098 case Bytecodes::_dstore_0 :
1099 case Bytecodes::_dstore_1 :
1100 case Bytecodes::_dstore_2 :
1101 case Bytecodes::_dstore_3 :
1102 index = opcode - Bytecodes::_dstore_0;
1103 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
1104 no_control_flow = false; break;
1105 case Bytecodes::_astore :
1106 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1107 no_control_flow = false; break;
1108 case Bytecodes::_astore_0 :
1109 case Bytecodes::_astore_1 :
1110 case Bytecodes::_astore_2 :
1111 case Bytecodes::_astore_3 :
1112 index = opcode - Bytecodes::_astore_0;
1113 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
1114 no_control_flow = false; break;
1115 case Bytecodes::_iastore :
1116 type = current_frame.pop_stack(
1117 VerificationType::integer_type(), CHECK_VERIFY(this));
1118 type2 = current_frame.pop_stack(
1119 VerificationType::integer_type(), CHECK_VERIFY(this));
1120 atype = current_frame.pop_stack(
1121 VerificationType::reference_check(), CHECK_VERIFY(this));
1122 if (!atype.is_int_array()) {
1123 verify_error(ErrorContext::bad_type(bci,
1124 current_frame.stack_top_ctx(), ref_ctx("[I")),
1125 bad_type_msg, "iastore");
1126 return;
1127 }
1128 no_control_flow = false; break;
1129 case Bytecodes::_bastore :
1130 type = current_frame.pop_stack(
1131 VerificationType::integer_type(), CHECK_VERIFY(this));
1132 type2 = current_frame.pop_stack(
1133 VerificationType::integer_type(), CHECK_VERIFY(this));
1134 atype = current_frame.pop_stack(
1135 VerificationType::reference_check(), CHECK_VERIFY(this));
1136 if (!atype.is_bool_array() && !atype.is_byte_array()) {
1137 verify_error(
1138 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1139 bad_type_msg, "bastore");
1140 return;
1141 }
1142 no_control_flow = false; break;
1143 case Bytecodes::_castore :
1144 current_frame.pop_stack(
1145 VerificationType::integer_type(), CHECK_VERIFY(this));
1146 current_frame.pop_stack(
1147 VerificationType::integer_type(), CHECK_VERIFY(this));
1148 atype = current_frame.pop_stack(
1149 VerificationType::reference_check(), CHECK_VERIFY(this));
1150 if (!atype.is_char_array()) {
1151 verify_error(ErrorContext::bad_type(bci,
1152 current_frame.stack_top_ctx(), ref_ctx("[C")),
1153 bad_type_msg, "castore");
1154 return;
1155 }
1156 no_control_flow = false; break;
1157 case Bytecodes::_sastore :
1158 current_frame.pop_stack(
1159 VerificationType::integer_type(), CHECK_VERIFY(this));
1160 current_frame.pop_stack(
1161 VerificationType::integer_type(), CHECK_VERIFY(this));
1162 atype = current_frame.pop_stack(
1163 VerificationType::reference_check(), CHECK_VERIFY(this));
1164 if (!atype.is_short_array()) {
1165 verify_error(ErrorContext::bad_type(bci,
1166 current_frame.stack_top_ctx(), ref_ctx("[S")),
1167 bad_type_msg, "sastore");
1168 return;
1169 }
1170 no_control_flow = false; break;
1171 case Bytecodes::_lastore :
1172 current_frame.pop_stack_2(
1173 VerificationType::long2_type(),
1174 VerificationType::long_type(), CHECK_VERIFY(this));
1175 current_frame.pop_stack(
1176 VerificationType::integer_type(), CHECK_VERIFY(this));
1177 atype = current_frame.pop_stack(
1178 VerificationType::reference_check(), CHECK_VERIFY(this));
1179 if (!atype.is_long_array()) {
1180 verify_error(ErrorContext::bad_type(bci,
1181 current_frame.stack_top_ctx(), ref_ctx("[J")),
1182 bad_type_msg, "lastore");
1183 return;
1184 }
1185 no_control_flow = false; break;
1186 case Bytecodes::_fastore :
1187 current_frame.pop_stack(
1188 VerificationType::float_type(), CHECK_VERIFY(this));
1189 current_frame.pop_stack
1190 (VerificationType::integer_type(), CHECK_VERIFY(this));
1191 atype = current_frame.pop_stack(
1192 VerificationType::reference_check(), CHECK_VERIFY(this));
1193 if (!atype.is_float_array()) {
1194 verify_error(ErrorContext::bad_type(bci,
1195 current_frame.stack_top_ctx(), ref_ctx("[F")),
1196 bad_type_msg, "fastore");
1197 return;
1198 }
1199 no_control_flow = false; break;
1200 case Bytecodes::_dastore :
1201 current_frame.pop_stack_2(
1202 VerificationType::double2_type(),
1203 VerificationType::double_type(), CHECK_VERIFY(this));
1204 current_frame.pop_stack(
1205 VerificationType::integer_type(), CHECK_VERIFY(this));
1206 atype = current_frame.pop_stack(
1207 VerificationType::reference_check(), CHECK_VERIFY(this));
1208 if (!atype.is_double_array()) {
1209 verify_error(ErrorContext::bad_type(bci,
1210 current_frame.stack_top_ctx(), ref_ctx("[D")),
1211 bad_type_msg, "dastore");
1212 return;
1213 }
1214 no_control_flow = false; break;
1215 case Bytecodes::_aastore :
1216 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1217 type2 = current_frame.pop_stack(
1218 VerificationType::integer_type(), CHECK_VERIFY(this));
1219 atype = current_frame.pop_stack(
1220 VerificationType::reference_check(), CHECK_VERIFY(this));
1221 // more type-checking is done at runtime
1222 if (!atype.is_nonscalar_array()) {
1223 verify_error(ErrorContext::bad_type(bci,
1224 current_frame.stack_top_ctx(),
1225 TypeOrigin::implicit(VerificationType::reference_check())),
1226 bad_type_msg, "aastore");
1227 return;
1228 }
1229 // 4938384: relaxed constraint in JVMS 3nd edition.
1230 no_control_flow = false; break;
1231 case Bytecodes::_pop :
1232 current_frame.pop_stack(
1233 VerificationType::category1_check(), CHECK_VERIFY(this));
1234 no_control_flow = false; break;
1235 case Bytecodes::_pop2 :
1236 type = current_frame.pop_stack(CHECK_VERIFY(this));
1237 if (type.is_category1()) {
1238 current_frame.pop_stack(
1239 VerificationType::category1_check(), CHECK_VERIFY(this));
1240 } else if (type.is_category2_2nd()) {
1241 current_frame.pop_stack(
1242 VerificationType::category2_check(), CHECK_VERIFY(this));
1243 } else {
1244 /* Unreachable? Would need a category2_1st on TOS
1245 * which does not appear possible. */
1246 verify_error(
1247 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1248 bad_type_msg, "pop2");
1249 return;
1250 }
1251 no_control_flow = false; break;
1252 case Bytecodes::_dup :
1253 type = current_frame.pop_stack(
1254 VerificationType::category1_check(), CHECK_VERIFY(this));
1255 current_frame.push_stack(type, CHECK_VERIFY(this));
1256 current_frame.push_stack(type, CHECK_VERIFY(this));
1257 no_control_flow = false; break;
1258 case Bytecodes::_dup_x1 :
1259 type = current_frame.pop_stack(
1260 VerificationType::category1_check(), CHECK_VERIFY(this));
1261 type2 = current_frame.pop_stack(
1262 VerificationType::category1_check(), CHECK_VERIFY(this));
1263 current_frame.push_stack(type, CHECK_VERIFY(this));
1264 current_frame.push_stack(type2, CHECK_VERIFY(this));
1265 current_frame.push_stack(type, CHECK_VERIFY(this));
1266 no_control_flow = false; break;
1267 case Bytecodes::_dup_x2 :
1268 {
1269 VerificationType type3;
1270 type = current_frame.pop_stack(
1271 VerificationType::category1_check(), CHECK_VERIFY(this));
1272 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1273 if (type2.is_category1()) {
1274 type3 = current_frame.pop_stack(
1275 VerificationType::category1_check(), CHECK_VERIFY(this));
1276 } else if (type2.is_category2_2nd()) {
1277 type3 = current_frame.pop_stack(
1278 VerificationType::category2_check(), CHECK_VERIFY(this));
1279 } else {
1280 /* Unreachable? Would need a category2_1st at stack depth 2 with
1281 * a category1 on TOS which does not appear possible. */
1282 verify_error(ErrorContext::bad_type(
1283 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1284 return;
1285 }
1286 current_frame.push_stack(type, CHECK_VERIFY(this));
1287 current_frame.push_stack(type3, CHECK_VERIFY(this));
1288 current_frame.push_stack(type2, CHECK_VERIFY(this));
1289 current_frame.push_stack(type, CHECK_VERIFY(this));
1290 no_control_flow = false; break;
1291 }
1292 case Bytecodes::_dup2 :
1293 type = current_frame.pop_stack(CHECK_VERIFY(this));
1294 if (type.is_category1()) {
1295 type2 = current_frame.pop_stack(
1296 VerificationType::category1_check(), CHECK_VERIFY(this));
1297 } else if (type.is_category2_2nd()) {
1298 type2 = current_frame.pop_stack(
1299 VerificationType::category2_check(), CHECK_VERIFY(this));
1300 } else {
1301 /* Unreachable? Would need a category2_1st on TOS which does not
1302 * appear possible. */
1303 verify_error(
1304 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1305 bad_type_msg, "dup2");
1306 return;
1307 }
1308 current_frame.push_stack(type2, CHECK_VERIFY(this));
1309 current_frame.push_stack(type, CHECK_VERIFY(this));
1310 current_frame.push_stack(type2, CHECK_VERIFY(this));
1311 current_frame.push_stack(type, CHECK_VERIFY(this));
1312 no_control_flow = false; break;
1313 case Bytecodes::_dup2_x1 :
1314 {
1315 VerificationType type3;
1316 type = current_frame.pop_stack(CHECK_VERIFY(this));
1317 if (type.is_category1()) {
1318 type2 = current_frame.pop_stack(
1319 VerificationType::category1_check(), CHECK_VERIFY(this));
1320 } else if (type.is_category2_2nd()) {
1321 type2 = current_frame.pop_stack(
1322 VerificationType::category2_check(), CHECK_VERIFY(this));
1323 } else {
1324 /* Unreachable? Would need a category2_1st on TOS which does
1325 * not appear possible. */
1326 verify_error(
1327 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1328 bad_type_msg, "dup2_x1");
1329 return;
1330 }
1331 type3 = current_frame.pop_stack(
1332 VerificationType::category1_check(), CHECK_VERIFY(this));
1333 current_frame.push_stack(type2, CHECK_VERIFY(this));
1334 current_frame.push_stack(type, CHECK_VERIFY(this));
1335 current_frame.push_stack(type3, CHECK_VERIFY(this));
1336 current_frame.push_stack(type2, CHECK_VERIFY(this));
1337 current_frame.push_stack(type, CHECK_VERIFY(this));
1338 no_control_flow = false; break;
1339 }
1340 case Bytecodes::_dup2_x2 :
1341 {
1342 VerificationType type3, type4;
1343 type = current_frame.pop_stack(CHECK_VERIFY(this));
1344 if (type.is_category1()) {
1345 type2 = current_frame.pop_stack(
1346 VerificationType::category1_check(), CHECK_VERIFY(this));
1347 } else if (type.is_category2_2nd()) {
1348 type2 = current_frame.pop_stack(
1349 VerificationType::category2_check(), CHECK_VERIFY(this));
1350 } else {
1351 /* Unreachable? Would need a category2_1st on TOS which does
1352 * not appear possible. */
1353 verify_error(
1354 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1355 bad_type_msg, "dup2_x2");
1356 return;
1357 }
1358 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1359 if (type3.is_category1()) {
1360 type4 = current_frame.pop_stack(
1361 VerificationType::category1_check(), CHECK_VERIFY(this));
1362 } else if (type3.is_category2_2nd()) {
1363 type4 = current_frame.pop_stack(
1364 VerificationType::category2_check(), CHECK_VERIFY(this));
1365 } else {
1366 /* Unreachable? Would need a category2_1st on TOS after popping
1367 * a long/double or two category 1's, which does not
1368 * appear possible. */
1369 verify_error(
1370 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1371 bad_type_msg, "dup2_x2");
1372 return;
1373 }
1374 current_frame.push_stack(type2, CHECK_VERIFY(this));
1375 current_frame.push_stack(type, CHECK_VERIFY(this));
1376 current_frame.push_stack(type4, CHECK_VERIFY(this));
1377 current_frame.push_stack(type3, CHECK_VERIFY(this));
1378 current_frame.push_stack(type2, CHECK_VERIFY(this));
1379 current_frame.push_stack(type, CHECK_VERIFY(this));
1380 no_control_flow = false; break;
1381 }
1382 case Bytecodes::_swap :
1383 type = current_frame.pop_stack(
1384 VerificationType::category1_check(), CHECK_VERIFY(this));
1385 type2 = current_frame.pop_stack(
1386 VerificationType::category1_check(), CHECK_VERIFY(this));
1387 current_frame.push_stack(type, CHECK_VERIFY(this));
1388 current_frame.push_stack(type2, CHECK_VERIFY(this));
1389 no_control_flow = false; break;
1390 case Bytecodes::_iadd :
1391 case Bytecodes::_isub :
1392 case Bytecodes::_imul :
1393 case Bytecodes::_idiv :
1394 case Bytecodes::_irem :
1395 case Bytecodes::_ishl :
1396 case Bytecodes::_ishr :
1397 case Bytecodes::_iushr :
1398 case Bytecodes::_ior :
1399 case Bytecodes::_ixor :
1400 case Bytecodes::_iand :
1401 current_frame.pop_stack(
1402 VerificationType::integer_type(), CHECK_VERIFY(this));
1403 // fall through
1404 case Bytecodes::_ineg :
1405 current_frame.pop_stack(
1406 VerificationType::integer_type(), CHECK_VERIFY(this));
1407 current_frame.push_stack(
1408 VerificationType::integer_type(), CHECK_VERIFY(this));
1409 no_control_flow = false; break;
1410 case Bytecodes::_ladd :
1411 case Bytecodes::_lsub :
1412 case Bytecodes::_lmul :
1413 case Bytecodes::_ldiv :
1414 case Bytecodes::_lrem :
1415 case Bytecodes::_land :
1416 case Bytecodes::_lor :
1417 case Bytecodes::_lxor :
1418 current_frame.pop_stack_2(
1419 VerificationType::long2_type(),
1420 VerificationType::long_type(), CHECK_VERIFY(this));
1421 // fall through
1422 case Bytecodes::_lneg :
1423 current_frame.pop_stack_2(
1424 VerificationType::long2_type(),
1425 VerificationType::long_type(), CHECK_VERIFY(this));
1426 current_frame.push_stack_2(
1427 VerificationType::long_type(),
1428 VerificationType::long2_type(), CHECK_VERIFY(this));
1429 no_control_flow = false; break;
1430 case Bytecodes::_lshl :
1431 case Bytecodes::_lshr :
1432 case Bytecodes::_lushr :
1433 current_frame.pop_stack(
1434 VerificationType::integer_type(), CHECK_VERIFY(this));
1435 current_frame.pop_stack_2(
1436 VerificationType::long2_type(),
1437 VerificationType::long_type(), CHECK_VERIFY(this));
1438 current_frame.push_stack_2(
1439 VerificationType::long_type(),
1440 VerificationType::long2_type(), CHECK_VERIFY(this));
1441 no_control_flow = false; break;
1442 case Bytecodes::_fadd :
1443 case Bytecodes::_fsub :
1444 case Bytecodes::_fmul :
1445 case Bytecodes::_fdiv :
1446 case Bytecodes::_frem :
1447 current_frame.pop_stack(
1448 VerificationType::float_type(), CHECK_VERIFY(this));
1449 // fall through
1450 case Bytecodes::_fneg :
1451 current_frame.pop_stack(
1452 VerificationType::float_type(), CHECK_VERIFY(this));
1453 current_frame.push_stack(
1454 VerificationType::float_type(), CHECK_VERIFY(this));
1455 no_control_flow = false; break;
1456 case Bytecodes::_dadd :
1457 case Bytecodes::_dsub :
1458 case Bytecodes::_dmul :
1459 case Bytecodes::_ddiv :
1460 case Bytecodes::_drem :
1461 current_frame.pop_stack_2(
1462 VerificationType::double2_type(),
1463 VerificationType::double_type(), CHECK_VERIFY(this));
1464 // fall through
1465 case Bytecodes::_dneg :
1466 current_frame.pop_stack_2(
1467 VerificationType::double2_type(),
1468 VerificationType::double_type(), CHECK_VERIFY(this));
1469 current_frame.push_stack_2(
1470 VerificationType::double_type(),
1471 VerificationType::double2_type(), CHECK_VERIFY(this));
1472 no_control_flow = false; break;
1473 case Bytecodes::_iinc :
1474 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1475 no_control_flow = false; break;
1476 case Bytecodes::_i2l :
1477 type = current_frame.pop_stack(
1478 VerificationType::integer_type(), CHECK_VERIFY(this));
1479 current_frame.push_stack_2(
1480 VerificationType::long_type(),
1481 VerificationType::long2_type(), CHECK_VERIFY(this));
1482 no_control_flow = false; break;
1483 case Bytecodes::_l2i :
1484 current_frame.pop_stack_2(
1485 VerificationType::long2_type(),
1486 VerificationType::long_type(), CHECK_VERIFY(this));
1487 current_frame.push_stack(
1488 VerificationType::integer_type(), CHECK_VERIFY(this));
1489 no_control_flow = false; break;
1490 case Bytecodes::_i2f :
1491 current_frame.pop_stack(
1492 VerificationType::integer_type(), CHECK_VERIFY(this));
1493 current_frame.push_stack(
1494 VerificationType::float_type(), CHECK_VERIFY(this));
1495 no_control_flow = false; break;
1496 case Bytecodes::_i2d :
1497 current_frame.pop_stack(
1498 VerificationType::integer_type(), CHECK_VERIFY(this));
1499 current_frame.push_stack_2(
1500 VerificationType::double_type(),
1501 VerificationType::double2_type(), CHECK_VERIFY(this));
1502 no_control_flow = false; break;
1503 case Bytecodes::_l2f :
1504 current_frame.pop_stack_2(
1505 VerificationType::long2_type(),
1506 VerificationType::long_type(), CHECK_VERIFY(this));
1507 current_frame.push_stack(
1508 VerificationType::float_type(), CHECK_VERIFY(this));
1509 no_control_flow = false; break;
1510 case Bytecodes::_l2d :
1511 current_frame.pop_stack_2(
1512 VerificationType::long2_type(),
1513 VerificationType::long_type(), CHECK_VERIFY(this));
1514 current_frame.push_stack_2(
1515 VerificationType::double_type(),
1516 VerificationType::double2_type(), CHECK_VERIFY(this));
1517 no_control_flow = false; break;
1518 case Bytecodes::_f2i :
1519 current_frame.pop_stack(
1520 VerificationType::float_type(), CHECK_VERIFY(this));
1521 current_frame.push_stack(
1522 VerificationType::integer_type(), CHECK_VERIFY(this));
1523 no_control_flow = false; break;
1524 case Bytecodes::_f2l :
1525 current_frame.pop_stack(
1526 VerificationType::float_type(), CHECK_VERIFY(this));
1527 current_frame.push_stack_2(
1528 VerificationType::long_type(),
1529 VerificationType::long2_type(), CHECK_VERIFY(this));
1530 no_control_flow = false; break;
1531 case Bytecodes::_f2d :
1532 current_frame.pop_stack(
1533 VerificationType::float_type(), CHECK_VERIFY(this));
1534 current_frame.push_stack_2(
1535 VerificationType::double_type(),
1536 VerificationType::double2_type(), CHECK_VERIFY(this));
1537 no_control_flow = false; break;
1538 case Bytecodes::_d2i :
1539 current_frame.pop_stack_2(
1540 VerificationType::double2_type(),
1541 VerificationType::double_type(), CHECK_VERIFY(this));
1542 current_frame.push_stack(
1543 VerificationType::integer_type(), CHECK_VERIFY(this));
1544 no_control_flow = false; break;
1545 case Bytecodes::_d2l :
1546 current_frame.pop_stack_2(
1547 VerificationType::double2_type(),
1548 VerificationType::double_type(), CHECK_VERIFY(this));
1549 current_frame.push_stack_2(
1550 VerificationType::long_type(),
1551 VerificationType::long2_type(), CHECK_VERIFY(this));
1552 no_control_flow = false; break;
1553 case Bytecodes::_d2f :
1554 current_frame.pop_stack_2(
1555 VerificationType::double2_type(),
1556 VerificationType::double_type(), CHECK_VERIFY(this));
1557 current_frame.push_stack(
1558 VerificationType::float_type(), CHECK_VERIFY(this));
1559 no_control_flow = false; break;
1560 case Bytecodes::_i2b :
1561 case Bytecodes::_i2c :
1562 case Bytecodes::_i2s :
1563 current_frame.pop_stack(
1564 VerificationType::integer_type(), CHECK_VERIFY(this));
1565 current_frame.push_stack(
1566 VerificationType::integer_type(), CHECK_VERIFY(this));
1567 no_control_flow = false; break;
1568 case Bytecodes::_lcmp :
1569 current_frame.pop_stack_2(
1570 VerificationType::long2_type(),
1571 VerificationType::long_type(), CHECK_VERIFY(this));
1572 current_frame.pop_stack_2(
1573 VerificationType::long2_type(),
1574 VerificationType::long_type(), CHECK_VERIFY(this));
1575 current_frame.push_stack(
1576 VerificationType::integer_type(), CHECK_VERIFY(this));
1577 no_control_flow = false; break;
1578 case Bytecodes::_fcmpl :
1579 case Bytecodes::_fcmpg :
1580 current_frame.pop_stack(
1581 VerificationType::float_type(), CHECK_VERIFY(this));
1582 current_frame.pop_stack(
1583 VerificationType::float_type(), CHECK_VERIFY(this));
1584 current_frame.push_stack(
1585 VerificationType::integer_type(), CHECK_VERIFY(this));
1586 no_control_flow = false; break;
1587 case Bytecodes::_dcmpl :
1588 case Bytecodes::_dcmpg :
1589 current_frame.pop_stack_2(
1590 VerificationType::double2_type(),
1591 VerificationType::double_type(), CHECK_VERIFY(this));
1592 current_frame.pop_stack_2(
1593 VerificationType::double2_type(),
1594 VerificationType::double_type(), CHECK_VERIFY(this));
1595 current_frame.push_stack(
1596 VerificationType::integer_type(), CHECK_VERIFY(this));
1597 no_control_flow = false; break;
1598 case Bytecodes::_if_icmpeq:
1599 case Bytecodes::_if_icmpne:
1600 case Bytecodes::_if_icmplt:
1601 case Bytecodes::_if_icmpge:
1602 case Bytecodes::_if_icmpgt:
1603 case Bytecodes::_if_icmple:
1604 current_frame.pop_stack(
1605 VerificationType::integer_type(), CHECK_VERIFY(this));
1606 // fall through
1607 case Bytecodes::_ifeq:
1608 case Bytecodes::_ifne:
1609 case Bytecodes::_iflt:
1610 case Bytecodes::_ifge:
1611 case Bytecodes::_ifgt:
1612 case Bytecodes::_ifle:
1613 current_frame.pop_stack(
1614 VerificationType::integer_type(), CHECK_VERIFY(this));
1615 target = bcs.dest();
1616 stackmap_table.check_jump_target(
1617 ¤t_frame, target, CHECK_VERIFY(this));
1618 no_control_flow = false; break;
1619 case Bytecodes::_if_acmpeq :
1620 case Bytecodes::_if_acmpne :
1621 current_frame.pop_stack(
1622 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1623 // fall through
1624 case Bytecodes::_ifnull :
1625 case Bytecodes::_ifnonnull :
1626 current_frame.pop_stack(
1627 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1628 target = bcs.dest();
1629 stackmap_table.check_jump_target
1630 (¤t_frame, target, CHECK_VERIFY(this));
1631 no_control_flow = false; break;
1632 case Bytecodes::_goto :
1633 target = bcs.dest();
1634 stackmap_table.check_jump_target(
1635 ¤t_frame, target, CHECK_VERIFY(this));
1636 no_control_flow = true; break;
1637 case Bytecodes::_goto_w :
1638 target = bcs.dest_w();
1639 stackmap_table.check_jump_target(
1640 ¤t_frame, target, CHECK_VERIFY(this));
1641 no_control_flow = true; break;
1642 case Bytecodes::_tableswitch :
1643 case Bytecodes::_lookupswitch :
1644 verify_switch(
1645 &bcs, code_length, code_data, ¤t_frame,
1646 &stackmap_table, CHECK_VERIFY(this));
1647 no_control_flow = true; break;
1648 case Bytecodes::_ireturn :
1649 type = current_frame.pop_stack(
1650 VerificationType::integer_type(), CHECK_VERIFY(this));
1651 verify_return_value(return_type, type, bci,
1652 ¤t_frame, CHECK_VERIFY(this));
1653 no_control_flow = true; break;
1654 case Bytecodes::_lreturn :
1655 type2 = current_frame.pop_stack(
1656 VerificationType::long2_type(), CHECK_VERIFY(this));
1657 type = current_frame.pop_stack(
1658 VerificationType::long_type(), CHECK_VERIFY(this));
1659 verify_return_value(return_type, type, bci,
1660 ¤t_frame, CHECK_VERIFY(this));
1661 no_control_flow = true; break;
1662 case Bytecodes::_freturn :
1663 type = current_frame.pop_stack(
1664 VerificationType::float_type(), CHECK_VERIFY(this));
1665 verify_return_value(return_type, type, bci,
1666 ¤t_frame, CHECK_VERIFY(this));
1667 no_control_flow = true; break;
1668 case Bytecodes::_dreturn :
1669 type2 = current_frame.pop_stack(
1670 VerificationType::double2_type(), CHECK_VERIFY(this));
1671 type = current_frame.pop_stack(
1672 VerificationType::double_type(), CHECK_VERIFY(this));
1673 verify_return_value(return_type, type, bci,
1674 ¤t_frame, CHECK_VERIFY(this));
1675 no_control_flow = true; break;
1676 case Bytecodes::_areturn :
1677 type = current_frame.pop_stack(
1678 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1679 verify_return_value(return_type, type, bci,
1680 ¤t_frame, CHECK_VERIFY(this));
1681 no_control_flow = true; break;
1682 case Bytecodes::_return :
1683 if (return_type != VerificationType::bogus_type()) {
1684 verify_error(ErrorContext::bad_code(bci),
1685 "Method expects a return value");
1686 return;
1687 }
1688 // Make sure "this" has been initialized if current method is an
1689 // <init>.
1690 if (_method->is_object_constructor() &&
1691 current_frame.flag_this_uninit()) {
1692 verify_error(ErrorContext::bad_code(bci),
1693 "Constructor must call super() or this() "
1694 "before return");
1695 return;
1696 }
1697 no_control_flow = true; break;
1698 case Bytecodes::_getstatic :
1699 case Bytecodes::_putstatic :
1700 // pass TRUE, operand can be an array type for getstatic/putstatic.
1701 verify_field_instructions(
1702 &bcs, ¤t_frame, cp, true, CHECK_VERIFY(this));
1703 no_control_flow = false; break;
1704 case Bytecodes::_getfield :
1705 case Bytecodes::_putfield :
1706 // pass FALSE, operand can't be an array type for getfield/putfield.
1707 verify_field_instructions(
1708 &bcs, ¤t_frame, cp, false, CHECK_VERIFY(this));
1709 no_control_flow = false; break;
1710 case Bytecodes::_withfield :
1711 if (_klass->major_version() < VALUETYPE_MAJOR_VERSION) {
1712 class_format_error(
1713 "withfield not supported by this class file version (%d.%d), class %s",
1714 _klass->major_version(), _klass->minor_version(), _klass->external_name());
1715 return;
1716 }
1717 // pass FALSE, operand can't be an array type for withfield.
1718 verify_field_instructions(
1719 &bcs, ¤t_frame, cp, false, CHECK_VERIFY(this));
1720 no_control_flow = false; break;
1721 case Bytecodes::_invokevirtual :
1722 case Bytecodes::_invokespecial :
1723 case Bytecodes::_invokestatic :
1724 case Bytecodes::_invokeinterface :
1725 case Bytecodes::_invokedynamic :
1726 verify_invoke_instructions(
1727 &bcs, code_length, ¤t_frame, (bci >= ex_min && bci < ex_max),
1728 &this_uninit, cp, &stackmap_table, CHECK_VERIFY(this));
1729 no_control_flow = false; break;
1730 case Bytecodes::_new :
1731 {
1732 index = bcs.get_index_u2();
1733 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1734 VerificationType new_class_type =
1735 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1736 if (!new_class_type.is_object()) {
1737 verify_error(ErrorContext::bad_type(bci,
1738 TypeOrigin::cp(index, new_class_type)),
1739 "Illegal new instruction");
1740 return;
1741 }
1742 type = VerificationType::uninitialized_type(bci);
1743 current_frame.push_stack(type, CHECK_VERIFY(this));
1744 no_control_flow = false; break;
1745 }
1746 case Bytecodes::_defaultvalue :
1747 {
1748 if (_klass->major_version() < VALUETYPE_MAJOR_VERSION) {
1749 class_format_error(
1750 "defaultvalue not supported by this class file version (%d.%d), class %s",
1751 _klass->major_version(), _klass->minor_version(), _klass->external_name());
1752 return;
1753 }
1754 index = bcs.get_index_u2();
1755 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1756 VerificationType ref_type = cp_index_to_type(index, cp, CHECK_VERIFY(this));
1757 if (!ref_type.is_object()) {
1758 verify_error(ErrorContext::bad_type(bci,
1759 TypeOrigin::cp(index, ref_type)),
1760 "Illegal defaultvalue instruction");
1761 return;
1762 }
1763 VerificationType value_type =
1764 VerificationType::change_ref_to_valuetype(ref_type);
1765 current_frame.push_stack(value_type, CHECK_VERIFY(this));
1766 no_control_flow = false; break;
1767 }
1768 case Bytecodes::_newarray :
1769 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1770 current_frame.pop_stack(
1771 VerificationType::integer_type(), CHECK_VERIFY(this));
1772 current_frame.push_stack(type, CHECK_VERIFY(this));
1773 no_control_flow = false; break;
1774 case Bytecodes::_anewarray :
1775 verify_anewarray(
1776 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1777 no_control_flow = false; break;
1778 case Bytecodes::_arraylength :
1779 type = current_frame.pop_stack(
1780 VerificationType::reference_check(), CHECK_VERIFY(this));
1781 if (!(type.is_null() || type.is_array())) {
1782 verify_error(ErrorContext::bad_type(
1783 bci, current_frame.stack_top_ctx()),
1784 bad_type_msg, "arraylength");
1785 }
1786 current_frame.push_stack(
1787 VerificationType::integer_type(), CHECK_VERIFY(this));
1788 no_control_flow = false; break;
1789 case Bytecodes::_checkcast :
1790 {
1791 index = bcs.get_index_u2();
1792 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1793 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1794 VerificationType klass_type = cp_index_to_type(
1795 index, cp, CHECK_VERIFY(this));
1796 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1797 no_control_flow = false; break;
1798 }
1799 case Bytecodes::_instanceof : {
1800 index = bcs.get_index_u2();
1801 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1802 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1803 current_frame.push_stack(
1804 VerificationType::integer_type(), CHECK_VERIFY(this));
1805 no_control_flow = false; break;
1806 }
1807 case Bytecodes::_monitorenter :
1808 case Bytecodes::_monitorexit : {
1809 VerificationType ref = current_frame.pop_stack(
1810 VerificationType::reference_check(), CHECK_VERIFY(this));
1811 no_control_flow = false; break;
1812 }
1813 case Bytecodes::_multianewarray :
1814 {
1815 index = bcs.get_index_u2();
1816 u2 dim = *(bcs.bcp()+3);
1817 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1818 VerificationType new_array_type =
1819 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1820 if (!new_array_type.is_array()) {
1821 verify_error(ErrorContext::bad_type(bci,
1822 TypeOrigin::cp(index, new_array_type)),
1823 "Illegal constant pool index in multianewarray instruction");
1824 return;
1825 }
1826 if (dim < 1 || new_array_type.dimensions() < dim) {
1827 verify_error(ErrorContext::bad_code(bci),
1828 "Illegal dimension in multianewarray instruction: %d", dim);
1829 return;
1830 }
1831 for (int i = 0; i < dim; i++) {
1832 current_frame.pop_stack(
1833 VerificationType::integer_type(), CHECK_VERIFY(this));
1834 }
1835 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1836 no_control_flow = false; break;
1837 }
1838 case Bytecodes::_athrow :
1839 type = VerificationType::reference_type(
1840 vmSymbols::java_lang_Throwable());
1841 current_frame.pop_stack(type, CHECK_VERIFY(this));
1842 no_control_flow = true; break;
1843 default:
1844 // We only need to check the valid bytecodes in class file.
1845 // And jsr and ret are not in the new class file format in JDK1.5.
1846 verify_error(ErrorContext::bad_code(bci),
1847 "Bad instruction: %02x", opcode);
1848 no_control_flow = false;
1849 return;
1850 } // end switch
1851 } // end Merge with the next instruction
1852
1853 // Look for possible jump target in exception handlers and see if it matches
1854 // current_frame. Don't do this check if it has already been done (for
1855 // ([a,d,f,i,l]store* opcodes). This check cannot be done earlier because
1856 // opcodes, such as invokespecial, may set the this_uninit flag.
1857 assert(!(verified_exc_handlers && this_uninit),
1858 "Exception handler targets got verified before this_uninit got set");
1859 if (!verified_exc_handlers && bci >= ex_min && bci < ex_max) {
1860 if (was_recursively_verified()) return;
1861 verify_exception_handler_targets(
1862 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1863 }
1864 } // end while
1865
1866 // Make sure that control flow does not fall through end of the method
1867 if (!no_control_flow) {
1868 verify_error(ErrorContext::bad_code(code_length),
1869 "Control flow falls through code end");
1870 return;
1871 }
1872 }
1873
1874 #undef bad_type_message
1875
1876 char* ClassVerifier::generate_code_data(const methodHandle& m, u4 code_length, TRAPS) {
1877 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1878 memset(code_data, 0, sizeof(char) * code_length);
1879 RawBytecodeStream bcs(m);
1880
1881 while (!bcs.is_last_bytecode()) {
1882 if (bcs.raw_next() != Bytecodes::_illegal) {
1883 int bci = bcs.bci();
1884 if (bcs.raw_code() == Bytecodes::_new) {
1885 code_data[bci] = NEW_OFFSET;
1886 } else {
1887 code_data[bci] = BYTECODE_OFFSET;
1888 }
1889 } else {
1890 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1891 return NULL;
1892 }
1893 }
1894
1895 return code_data;
1896 }
1897
1898 // Since this method references the constant pool, call was_recursively_verified()
1899 // before calling this method to make sure a prior class load did not cause the
1900 // current class to get verified.
1901 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1902 ExceptionTable exhandlers(_method());
1903 int exlength = exhandlers.length();
1904 constantPoolHandle cp (THREAD, _method->constants());
1905
1906 for(int i = 0; i < exlength; i++) {
1907 u2 start_pc = exhandlers.start_pc(i);
1908 u2 end_pc = exhandlers.end_pc(i);
1909 u2 handler_pc = exhandlers.handler_pc(i);
1910 if (start_pc >= code_length || code_data[start_pc] == 0) {
1911 class_format_error("Illegal exception table start_pc %d", start_pc);
1912 return;
1913 }
1914 if (end_pc != code_length) { // special case: end_pc == code_length
1915 if (end_pc > code_length || code_data[end_pc] == 0) {
1916 class_format_error("Illegal exception table end_pc %d", end_pc);
1917 return;
1918 }
1919 }
1920 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1921 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1922 return;
1923 }
1924 int catch_type_index = exhandlers.catch_type_index(i);
1925 if (catch_type_index != 0) {
1926 VerificationType catch_type = cp_index_to_type(
1927 catch_type_index, cp, CHECK_VERIFY(this));
1928 VerificationType throwable =
1929 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1930 bool is_subclass = throwable.is_assignable_from(
1931 catch_type, this, false, CHECK_VERIFY(this));
1932 if (!is_subclass) {
1933 // 4286534: should throw VerifyError according to recent spec change
1934 verify_error(ErrorContext::bad_type(handler_pc,
1935 TypeOrigin::cp(catch_type_index, catch_type),
1936 TypeOrigin::implicit(throwable)),
1937 "Catch type is not a subclass "
1938 "of Throwable in exception handler %d", handler_pc);
1939 return;
1940 }
1941 }
1942 if (start_pc < min) min = start_pc;
1943 if (end_pc > max) max = end_pc;
1944 }
1945 }
1946
1947 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1948 int localvariable_table_length = _method->localvariable_table_length();
1949 if (localvariable_table_length > 0) {
1950 LocalVariableTableElement* table = _method->localvariable_table_start();
1951 for (int i = 0; i < localvariable_table_length; i++) {
1952 u2 start_bci = table[i].start_bci;
1953 u2 length = table[i].length;
1954
1955 if (start_bci >= code_length || code_data[start_bci] == 0) {
1956 class_format_error(
1957 "Illegal local variable table start_pc %d", start_bci);
1958 return;
1959 }
1960 u4 end_bci = (u4)(start_bci + length);
1961 if (end_bci != code_length) {
1962 if (end_bci >= code_length || code_data[end_bci] == 0) {
1963 class_format_error( "Illegal local variable table length %d", length);
1964 return;
1965 }
1966 }
1967 }
1968 }
1969 }
1970
1971 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1972 StackMapFrame* current_frame,
1973 StackMapTable* stackmap_table,
1974 bool no_control_flow, TRAPS) {
1975 if (stackmap_index < stackmap_table->get_frame_count()) {
1976 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1977 if (no_control_flow && this_offset > bci) {
1978 verify_error(ErrorContext::missing_stackmap(bci),
1979 "Expecting a stack map frame");
1980 return 0;
1981 }
1982 if (this_offset == bci) {
1983 ErrorContext ctx;
1984 // See if current stack map can be assigned to the frame in table.
1985 // current_frame is the stackmap frame got from the last instruction.
1986 // If matched, current_frame will be updated by this method.
1987 bool matches = stackmap_table->match_stackmap(
1988 current_frame, this_offset, stackmap_index,
1989 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1990 if (!matches) {
1991 // report type error
1992 verify_error(ctx, "Instruction type does not match stack map");
1993 return 0;
1994 }
1995 stackmap_index++;
1996 } else if (this_offset < bci) {
1997 // current_offset should have met this_offset.
1998 class_format_error("Bad stack map offset %d", this_offset);
1999 return 0;
2000 }
2001 } else if (no_control_flow) {
2002 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
2003 return 0;
2004 }
2005 return stackmap_index;
2006 }
2007
2008 // Since this method references the constant pool, call was_recursively_verified()
2009 // before calling this method to make sure a prior class load did not cause the
2010 // current class to get verified.
2011 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit,
2012 StackMapFrame* current_frame,
2013 StackMapTable* stackmap_table, TRAPS) {
2014 constantPoolHandle cp (THREAD, _method->constants());
2015 ExceptionTable exhandlers(_method());
2016 int exlength = exhandlers.length();
2017 for(int i = 0; i < exlength; i++) {
2018 u2 start_pc = exhandlers.start_pc(i);
2019 u2 end_pc = exhandlers.end_pc(i);
2020 u2 handler_pc = exhandlers.handler_pc(i);
2021 int catch_type_index = exhandlers.catch_type_index(i);
2022 if(bci >= start_pc && bci < end_pc) {
2023 u1 flags = current_frame->flags();
2024 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
2025 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
2026 if (catch_type_index != 0) {
2027 if (was_recursively_verified()) return;
2028 // We know that this index refers to a subclass of Throwable
2029 VerificationType catch_type = cp_index_to_type(
2030 catch_type_index, cp, CHECK_VERIFY(this));
2031 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
2032 } else {
2033 VerificationType throwable =
2034 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
2035 new_frame->push_stack(throwable, CHECK_VERIFY(this));
2036 }
2037 ErrorContext ctx;
2038 bool matches = stackmap_table->match_stackmap(
2039 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
2040 if (!matches) {
2041 verify_error(ctx, "Stack map does not match the one at "
2042 "exception handler %d", handler_pc);
2043 return;
2044 }
2045 }
2046 }
2047 }
2048
2049 void ClassVerifier::verify_cp_index(
2050 u2 bci, const constantPoolHandle& cp, int index, TRAPS) {
2051 int nconstants = cp->length();
2052 if ((index <= 0) || (index >= nconstants)) {
2053 verify_error(ErrorContext::bad_cp_index(bci, index),
2054 "Illegal constant pool index %d in class %s",
2055 index, cp->pool_holder()->external_name());
2056 return;
2057 }
2058 }
2059
2060 void ClassVerifier::verify_cp_type(
2061 u2 bci, int index, const constantPoolHandle& cp, unsigned int types, TRAPS) {
2062
2063 // In some situations, bytecode rewriting may occur while we're verifying.
2064 // In this case, a constant pool cache exists and some indices refer to that
2065 // instead. Be sure we don't pick up such indices by accident.
2066 // We must check was_recursively_verified() before we get here.
2067 guarantee(cp->cache() == NULL, "not rewritten yet");
2068
2069 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
2070 unsigned int tag = cp->tag_at(index).value();
2071
2072 if ((types & (1 << tag)) == 0) {
2073 verify_error(ErrorContext::bad_cp_index(bci, index),
2074 "Illegal type at constant pool entry %d in class %s",
2075 index, cp->pool_holder()->external_name());
2076 return;
2077 }
2078 }
2079
2080 void ClassVerifier::verify_cp_class_type(
2081 u2 bci, int index, const constantPoolHandle& cp, TRAPS) {
2082 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
2083 constantTag tag = cp->tag_at(index);
2084 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2085 verify_error(ErrorContext::bad_cp_index(bci, index),
2086 "Illegal type at constant pool entry %d in class %s",
2087 index, cp->pool_holder()->external_name());
2088 return;
2089 }
2090 }
2091
2092 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
2093 stringStream ss;
2094
2095 ctx.reset_frames();
2096 _exception_type = vmSymbols::java_lang_VerifyError();
2097 _error_context = ctx;
2098 va_list va;
2099 va_start(va, msg);
2100 ss.vprint(msg, va);
2101 va_end(va);
2102 _message = ss.as_string();
2103 #ifdef ASSERT
2104 ResourceMark rm;
2105 const char* exception_name = _exception_type->as_C_string();
2106 Exceptions::debug_check_abort(exception_name, NULL);
2107 #endif // ndef ASSERT
2108 }
2109
2110 void ClassVerifier::class_format_error(const char* msg, ...) {
2111 stringStream ss;
2112 _exception_type = vmSymbols::java_lang_ClassFormatError();
2113 va_list va;
2114 va_start(va, msg);
2115 ss.vprint(msg, va);
2116 va_end(va);
2117 if (!_method.is_null()) {
2118 ss.print(" in method '");
2119 _method->print_external_name(&ss);
2120 ss.print("'");
2121 }
2122 _message = ss.as_string();
2123 }
2124
2125 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
2126 HandleMark hm(THREAD);
2127 // Get current loader and protection domain first.
2128 oop loader = current_class()->class_loader();
2129 oop protection_domain = current_class()->protection_domain();
2130
2131 Klass* kls = SystemDictionary::resolve_or_fail(
2132 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
2133 true, THREAD);
2134
2135 if (kls != NULL) {
2136 if (log_is_enabled(Debug, class, resolve)) {
2137 Verifier::trace_class_resolution(kls, current_class());
2138 }
2139 }
2140 return kls;
2141 }
2142
2143 bool ClassVerifier::is_protected_access(InstanceKlass* this_class,
2144 Klass* target_class,
2145 Symbol* field_name,
2146 Symbol* field_sig,
2147 bool is_method) {
2148 NoSafepointVerifier nosafepoint;
2149
2150 // If target class isn't a super class of this class, we don't worry about this case
2151 if (!this_class->is_subclass_of(target_class)) {
2152 return false;
2153 }
2154 // Check if the specified method or field is protected
2155 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
2156 fieldDescriptor fd;
2157 if (is_method) {
2158 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::find_overpass);
2159 if (m != NULL && m->is_protected()) {
2160 if (!this_class->is_same_class_package(m->method_holder())) {
2161 return true;
2162 }
2163 }
2164 } else {
2165 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
2166 if (member_klass != NULL && fd.is_protected()) {
2167 if (!this_class->is_same_class_package(member_klass)) {
2168 return true;
2169 }
2170 }
2171 }
2172 return false;
2173 }
2174
2175 void ClassVerifier::verify_ldc(
2176 int opcode, u2 index, StackMapFrame* current_frame,
2177 const constantPoolHandle& cp, u2 bci, TRAPS) {
2178 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
2179 constantTag tag = cp->tag_at(index);
2180 unsigned int types = 0;
2181 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
2182 if (!tag.is_unresolved_klass()) {
2183 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
2184 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
2185 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType)
2186 | (1 << JVM_CONSTANT_Dynamic);
2187 // Note: The class file parser already verified the legality of
2188 // MethodHandle and MethodType constants.
2189 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2190 }
2191 } else {
2192 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
2193 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long)
2194 | (1 << JVM_CONSTANT_Dynamic);
2195 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2196 }
2197 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
2198 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
2199 } else if (tag.is_string()) {
2200 current_frame->push_stack(
2201 VerificationType::reference_type(
2202 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
2203 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
2204 current_frame->push_stack(
2205 VerificationType::reference_type(
2206 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
2207 } else if (tag.is_int()) {
2208 current_frame->push_stack(
2209 VerificationType::integer_type(), CHECK_VERIFY(this));
2210 } else if (tag.is_float()) {
2211 current_frame->push_stack(
2212 VerificationType::float_type(), CHECK_VERIFY(this));
2213 } else if (tag.is_double()) {
2214 current_frame->push_stack_2(
2215 VerificationType::double_type(),
2216 VerificationType::double2_type(), CHECK_VERIFY(this));
2217 } else if (tag.is_long()) {
2218 current_frame->push_stack_2(
2219 VerificationType::long_type(),
2220 VerificationType::long2_type(), CHECK_VERIFY(this));
2221 } else if (tag.is_method_handle()) {
2222 current_frame->push_stack(
2223 VerificationType::reference_type(
2224 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2225 } else if (tag.is_method_type()) {
2226 current_frame->push_stack(
2227 VerificationType::reference_type(
2228 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2229 } else if (tag.is_dynamic_constant()) {
2230 Symbol* constant_type = cp->uncached_signature_ref_at(index);
2231 // Field signature was checked in ClassFileParser.
2232 assert(SignatureVerifier::is_valid_type_signature(constant_type),
2233 "Invalid type for dynamic constant");
2234 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2235 "buffer type must match VerificationType size");
2236 uintptr_t constant_type_buffer[2];
2237 VerificationType* v_constant_type = (VerificationType*)constant_type_buffer;
2238 SignatureStream sig_stream(constant_type, false);
2239 int n = change_sig_to_verificationType(&sig_stream, v_constant_type);
2240 int opcode_n = (opcode == Bytecodes::_ldc2_w ? 2 : 1);
2241 if (n != opcode_n) {
2242 // wrong kind of ldc; reverify against updated type mask
2243 types &= ~(1 << JVM_CONSTANT_Dynamic);
2244 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2245 }
2246 for (int i = 0; i < n; i++) {
2247 current_frame->push_stack(v_constant_type[i], CHECK_VERIFY(this));
2248 }
2249 } else {
2250 /* Unreachable? verify_cp_type has already validated the cp type. */
2251 verify_error(
2252 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2253 return;
2254 }
2255 }
2256
2257 void ClassVerifier::verify_switch(
2258 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2259 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2260 int bci = bcs->bci();
2261 address bcp = bcs->bcp();
2262 address aligned_bcp = align_up(bcp + 1, jintSize);
2263
2264 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2265 // 4639449 & 4647081: padding bytes must be 0
2266 u2 padding_offset = 1;
2267 while ((bcp + padding_offset) < aligned_bcp) {
2268 if(*(bcp + padding_offset) != 0) {
2269 verify_error(ErrorContext::bad_code(bci),
2270 "Nonzero padding byte in lookupswitch or tableswitch");
2271 return;
2272 }
2273 padding_offset++;
2274 }
2275 }
2276
2277 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2278 int keys, delta;
2279 current_frame->pop_stack(
2280 VerificationType::integer_type(), CHECK_VERIFY(this));
2281 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2282 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2283 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2284 if (low > high) {
2285 verify_error(ErrorContext::bad_code(bci),
2286 "low must be less than or equal to high in tableswitch");
2287 return;
2288 }
2289 keys = high - low + 1;
2290 if (keys < 0) {
2291 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2292 return;
2293 }
2294 delta = 1;
2295 } else {
2296 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2297 if (keys < 0) {
2298 verify_error(ErrorContext::bad_code(bci),
2299 "number of keys in lookupswitch less than 0");
2300 return;
2301 }
2302 delta = 2;
2303 // Make sure that the lookupswitch items are sorted
2304 for (int i = 0; i < (keys - 1); i++) {
2305 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2306 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2307 if (this_key >= next_key) {
2308 verify_error(ErrorContext::bad_code(bci),
2309 "Bad lookupswitch instruction");
2310 return;
2311 }
2312 }
2313 }
2314 int target = bci + default_offset;
2315 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2316 for (int i = 0; i < keys; i++) {
2317 // Because check_jump_target() may safepoint, the bytecode could have
2318 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2319 aligned_bcp = align_up(bcs->bcp() + 1, jintSize);
2320 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2321 stackmap_table->check_jump_target(
2322 current_frame, target, CHECK_VERIFY(this));
2323 }
2324 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2325 }
2326
2327 bool ClassVerifier::name_in_supers(
2328 Symbol* ref_name, InstanceKlass* current) {
2329 Klass* super = current->super();
2330 while (super != NULL) {
2331 if (super->name() == ref_name) {
2332 return true;
2333 }
2334 super = super->super();
2335 }
2336 return false;
2337 }
2338
2339 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2340 StackMapFrame* current_frame,
2341 const constantPoolHandle& cp,
2342 bool allow_arrays,
2343 TRAPS) {
2344 u2 index = bcs->get_index_u2();
2345 verify_cp_type(bcs->bci(), index, cp,
2346 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2347
2348 // Get field name and signature
2349 Symbol* field_name = cp->name_ref_at(index);
2350 Symbol* field_sig = cp->signature_ref_at(index);
2351
2352 // Field signature was checked in ClassFileParser.
2353 assert(SignatureVerifier::is_valid_type_signature(field_sig),
2354 "Invalid field signature");
2355
2356 // Get referenced class type
2357 VerificationType ref_class_type = cp_ref_index_to_type(
2358 index, cp, CHECK_VERIFY(this));
2359 if (!ref_class_type.is_object() &&
2360 (!allow_arrays || !ref_class_type.is_array())) {
2361 verify_error(ErrorContext::bad_type(bcs->bci(),
2362 TypeOrigin::cp(index, ref_class_type)),
2363 "Expecting reference to class in class %s at constant pool index %d",
2364 _klass->external_name(), index);
2365 return;
2366 }
2367
2368 VerificationType target_class_type = ref_class_type;
2369
2370 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2371 "buffer type must match VerificationType size");
2372 uintptr_t field_type_buffer[2];
2373 VerificationType* field_type = (VerificationType*)field_type_buffer;
2374 // If we make a VerificationType[2] array directly, the compiler calls
2375 // to the c-runtime library to do the allocation instead of just
2376 // stack allocating it. Plus it would run constructors. This shows up
2377 // in performance profiles.
2378
2379 SignatureStream sig_stream(field_sig, false);
2380 VerificationType stack_object_type;
2381 int n = change_sig_to_verificationType(&sig_stream, field_type);
2382 u2 bci = bcs->bci();
2383 bool is_assignable;
2384 switch (bcs->raw_code()) {
2385 case Bytecodes::_getstatic: {
2386 for (int i = 0; i < n; i++) {
2387 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2388 }
2389 break;
2390 }
2391 case Bytecodes::_putstatic: {
2392 for (int i = n - 1; i >= 0; i--) {
2393 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2394 }
2395 break;
2396 }
2397 case Bytecodes::_withfield: {
2398 for (int i = n - 1; i >= 0; i--) {
2399 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2400 }
2401 // stack_object_type and target_class_type must be the same value type.
2402 stack_object_type =
2403 current_frame->pop_stack(VerificationType::valuetype_check(), CHECK_VERIFY(this));
2404 VerificationType target_value_type =
2405 VerificationType::change_ref_to_valuetype(target_class_type);
2406 if (!stack_object_type.equals(target_value_type)) {
2407 verify_error(ErrorContext::bad_value_type(bci,
2408 current_frame->stack_top_ctx(),
2409 TypeOrigin::cp(index, target_class_type)),
2410 "Invalid type on operand stack in withfield instruction");
2411 return;
2412 }
2413 current_frame->push_stack(target_value_type, CHECK_VERIFY(this));
2414 break;
2415 }
2416 case Bytecodes::_getfield: {
2417 stack_object_type = current_frame->pop_stack(
2418 target_class_type, CHECK_VERIFY(this));
2419 for (int i = 0; i < n; i++) {
2420 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2421 }
2422 goto check_protected;
2423 }
2424 case Bytecodes::_putfield: {
2425 for (int i = n - 1; i >= 0; i--) {
2426 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2427 }
2428 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2429
2430 // The JVMS 2nd edition allows field initialization before the superclass
2431 // initializer, if the field is defined within the current class.
2432 fieldDescriptor fd;
2433 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2434 target_class_type.equals(current_type()) &&
2435 _klass->find_local_field(field_name, field_sig, &fd)) {
2436 stack_object_type = current_type();
2437 }
2438 is_assignable = target_class_type.is_assignable_from(
2439 stack_object_type, this, false, CHECK_VERIFY(this));
2440 if (!is_assignable) {
2441 verify_error(ErrorContext::bad_type(bci,
2442 current_frame->stack_top_ctx(),
2443 TypeOrigin::cp(index, target_class_type)),
2444 "Bad type on operand stack in putfield");
2445 return;
2446 }
2447 }
2448 check_protected: {
2449 if (_this_type == stack_object_type)
2450 break; // stack_object_type must be assignable to _current_class_type
2451 if (was_recursively_verified()) return;
2452 Symbol* ref_class_name =
2453 cp->klass_name_at(cp->klass_ref_index_at(index));
2454 if (!name_in_supers(ref_class_name, current_class()))
2455 // stack_object_type must be assignable to _current_class_type since:
2456 // 1. stack_object_type must be assignable to ref_class.
2457 // 2. ref_class must be _current_class or a subclass of it. It can't
2458 // be a superclass of it. See revised JVMS 5.4.4.
2459 break;
2460
2461 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2462 if (is_protected_access(current_class(), ref_class_oop, field_name,
2463 field_sig, false)) {
2464 // It's protected access, check if stack object is assignable to
2465 // current class.
2466 is_assignable = current_type().is_assignable_from(
2467 stack_object_type, this, true, CHECK_VERIFY(this));
2468 if (!is_assignable) {
2469 verify_error(ErrorContext::bad_type(bci,
2470 current_frame->stack_top_ctx(),
2471 TypeOrigin::implicit(current_type())),
2472 "Bad access to protected data in getfield");
2473 return;
2474 }
2475 }
2476 break;
2477 }
2478 default: ShouldNotReachHere();
2479 }
2480 }
2481
2482 // Look at the method's handlers. If the bci is in the handler's try block
2483 // then check if the handler_pc is already on the stack. If not, push it
2484 // unless the handler has already been scanned.
2485 void ClassVerifier::push_handlers(ExceptionTable* exhandlers,
2486 GrowableArray<u4>* handler_list,
2487 GrowableArray<u4>* handler_stack,
2488 u4 bci) {
2489 int exlength = exhandlers->length();
2490 for(int x = 0; x < exlength; x++) {
2491 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) {
2492 u4 exhandler_pc = exhandlers->handler_pc(x);
2493 if (!handler_list->contains(exhandler_pc)) {
2494 handler_stack->append_if_missing(exhandler_pc);
2495 handler_list->append(exhandler_pc);
2496 }
2497 }
2498 }
2499 }
2500
2501 // Return TRUE if all code paths starting with start_bc_offset end in
2502 // bytecode athrow or loop.
2503 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) {
2504 ResourceMark rm;
2505 // Create bytecode stream.
2506 RawBytecodeStream bcs(method());
2507 u4 code_length = method()->code_size();
2508 bcs.set_start(start_bc_offset);
2509 u4 target;
2510 // Create stack for storing bytecode start offsets for if* and *switch.
2511 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(30);
2512 // Create stack for handlers for try blocks containing this handler.
2513 GrowableArray<u4>* handler_stack = new GrowableArray<u4>(30);
2514 // Create list of handlers that have been pushed onto the handler_stack
2515 // so that handlers embedded inside of their own TRY blocks only get
2516 // scanned once.
2517 GrowableArray<u4>* handler_list = new GrowableArray<u4>(30);
2518 // Create list of visited branch opcodes (goto* and if*).
2519 GrowableArray<u4>* visited_branches = new GrowableArray<u4>(30);
2520 ExceptionTable exhandlers(_method());
2521
2522 while (true) {
2523 if (bcs.is_last_bytecode()) {
2524 // if no more starting offsets to parse or if at the end of the
2525 // method then return false.
2526 if ((bci_stack->is_empty()) || ((u4)bcs.end_bci() == code_length))
2527 return false;
2528 // Pop a bytecode starting offset and scan from there.
2529 bcs.set_start(bci_stack->pop());
2530 }
2531 Bytecodes::Code opcode = bcs.raw_next();
2532 u4 bci = bcs.bci();
2533
2534 // If the bytecode is in a TRY block, push its handlers so they
2535 // will get parsed.
2536 push_handlers(&exhandlers, handler_list, handler_stack, bci);
2537
2538 switch (opcode) {
2539 case Bytecodes::_if_icmpeq:
2540 case Bytecodes::_if_icmpne:
2541 case Bytecodes::_if_icmplt:
2542 case Bytecodes::_if_icmpge:
2543 case Bytecodes::_if_icmpgt:
2544 case Bytecodes::_if_icmple:
2545 case Bytecodes::_ifeq:
2546 case Bytecodes::_ifne:
2547 case Bytecodes::_iflt:
2548 case Bytecodes::_ifge:
2549 case Bytecodes::_ifgt:
2550 case Bytecodes::_ifle:
2551 case Bytecodes::_if_acmpeq:
2552 case Bytecodes::_if_acmpne:
2553 case Bytecodes::_ifnull:
2554 case Bytecodes::_ifnonnull:
2555 target = bcs.dest();
2556 if (visited_branches->contains(bci)) {
2557 if (bci_stack->is_empty()) {
2558 if (handler_stack->is_empty()) {
2559 return true;
2560 } else {
2561 // Parse the catch handlers for try blocks containing athrow.
2562 bcs.set_start(handler_stack->pop());
2563 }
2564 } else {
2565 // Pop a bytecode starting offset and scan from there.
2566 bcs.set_start(bci_stack->pop());
2567 }
2568 } else {
2569 if (target > bci) { // forward branch
2570 if (target >= code_length) return false;
2571 // Push the branch target onto the stack.
2572 bci_stack->push(target);
2573 // then, scan bytecodes starting with next.
2574 bcs.set_start(bcs.next_bci());
2575 } else { // backward branch
2576 // Push bytecode offset following backward branch onto the stack.
2577 bci_stack->push(bcs.next_bci());
2578 // Check bytecodes starting with branch target.
2579 bcs.set_start(target);
2580 }
2581 // Record target so we don't branch here again.
2582 visited_branches->append(bci);
2583 }
2584 break;
2585
2586 case Bytecodes::_goto:
2587 case Bytecodes::_goto_w:
2588 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2589 if (visited_branches->contains(bci)) {
2590 if (bci_stack->is_empty()) {
2591 if (handler_stack->is_empty()) {
2592 return true;
2593 } else {
2594 // Parse the catch handlers for try blocks containing athrow.
2595 bcs.set_start(handler_stack->pop());
2596 }
2597 } else {
2598 // Been here before, pop new starting offset from stack.
2599 bcs.set_start(bci_stack->pop());
2600 }
2601 } else {
2602 if (target >= code_length) return false;
2603 // Continue scanning from the target onward.
2604 bcs.set_start(target);
2605 // Record target so we don't branch here again.
2606 visited_branches->append(bci);
2607 }
2608 break;
2609
2610 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2611 // is difficult to determine where each switch alternative ends, parse
2612 // each switch alternative until either hit a 'return', 'athrow', or reach
2613 // the end of the method's bytecodes. This is gross but should be okay
2614 // because:
2615 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2616 // constructor invocations should be rare.
2617 // 2. if each switch alternative ends in an athrow then the parsing should be
2618 // short. If there is no athrow then it is bogus code, anyway.
2619 case Bytecodes::_lookupswitch:
2620 case Bytecodes::_tableswitch:
2621 {
2622 address aligned_bcp = align_up(bcs.bcp() + 1, jintSize);
2623 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2624 int keys, delta;
2625 if (opcode == Bytecodes::_tableswitch) {
2626 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2627 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2628 // This is invalid, but let the regular bytecode verifier
2629 // report this because the user will get a better error message.
2630 if (low > high) return true;
2631 keys = high - low + 1;
2632 delta = 1;
2633 } else {
2634 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2635 delta = 2;
2636 }
2637 // Invalid, let the regular bytecode verifier deal with it.
2638 if (keys < 0) return true;
2639
2640 // Push the offset of the next bytecode onto the stack.
2641 bci_stack->push(bcs.next_bci());
2642
2643 // Push the switch alternatives onto the stack.
2644 for (int i = 0; i < keys; i++) {
2645 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2646 if (target > code_length) return false;
2647 bci_stack->push(target);
2648 }
2649
2650 // Start bytecode parsing for the switch at the default alternative.
2651 if (default_offset > code_length) return false;
2652 bcs.set_start(default_offset);
2653 break;
2654 }
2655
2656 case Bytecodes::_return:
2657 return false;
2658
2659 case Bytecodes::_athrow:
2660 {
2661 if (bci_stack->is_empty()) {
2662 if (handler_stack->is_empty()) {
2663 return true;
2664 } else {
2665 // Parse the catch handlers for try blocks containing athrow.
2666 bcs.set_start(handler_stack->pop());
2667 }
2668 } else {
2669 // Pop a bytecode offset and starting scanning from there.
2670 bcs.set_start(bci_stack->pop());
2671 }
2672 }
2673 break;
2674
2675 default:
2676 ;
2677 } // end switch
2678 } // end while loop
2679
2680 return false;
2681 }
2682
2683 void ClassVerifier::verify_invoke_init(
2684 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2685 StackMapFrame* current_frame, u4 code_length, bool in_try_block,
2686 bool *this_uninit, const constantPoolHandle& cp, StackMapTable* stackmap_table,
2687 TRAPS) {
2688 u2 bci = bcs->bci();
2689 VerificationType type = current_frame->pop_stack(
2690 VerificationType::reference_check(), CHECK_VERIFY(this));
2691 if (type == VerificationType::uninitialized_this_type()) {
2692 // The method must be an <init> method of this class or its superclass
2693 Klass* superk = current_class()->super();
2694 if (ref_class_type.name() != current_class()->name() &&
2695 ref_class_type.name() != superk->name()) {
2696 verify_error(ErrorContext::bad_type(bci,
2697 TypeOrigin::implicit(ref_class_type),
2698 TypeOrigin::implicit(current_type())),
2699 "Bad <init> method call");
2700 return;
2701 }
2702
2703 // If this invokespecial call is done from inside of a TRY block then make
2704 // sure that all catch clause paths end in a throw. Otherwise, this can
2705 // result in returning an incomplete object.
2706 if (in_try_block) {
2707 ExceptionTable exhandlers(_method());
2708 int exlength = exhandlers.length();
2709 for(int i = 0; i < exlength; i++) {
2710 u2 start_pc = exhandlers.start_pc(i);
2711 u2 end_pc = exhandlers.end_pc(i);
2712
2713 if (bci >= start_pc && bci < end_pc) {
2714 if (!ends_in_athrow(exhandlers.handler_pc(i))) {
2715 verify_error(ErrorContext::bad_code(bci),
2716 "Bad <init> method call from after the start of a try block");
2717 return;
2718 } else if (log_is_enabled(Info, verification)) {
2719 ResourceMark rm(THREAD);
2720 log_info(verification)("Survived call to ends_in_athrow(): %s",
2721 current_class()->name()->as_C_string());
2722 }
2723 }
2724 }
2725
2726 // Check the exception handler target stackmaps with the locals from the
2727 // incoming stackmap (before initialize_object() changes them to outgoing
2728 // state).
2729 if (was_recursively_verified()) return;
2730 verify_exception_handler_targets(bci, true, current_frame,
2731 stackmap_table, CHECK_VERIFY(this));
2732 } // in_try_block
2733
2734 current_frame->initialize_object(type, current_type());
2735 *this_uninit = true;
2736 } else if (type.is_uninitialized()) {
2737 u2 new_offset = type.bci();
2738 address new_bcp = bcs->bcp() - bci + new_offset;
2739 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2740 /* Unreachable? Stack map parsing ensures valid type and new
2741 * instructions have a valid BCI. */
2742 verify_error(ErrorContext::bad_code(new_offset),
2743 "Expecting new instruction");
2744 return;
2745 }
2746 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2747 if (was_recursively_verified()) return;
2748 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2749
2750 // The method must be an <init> method of the indicated class
2751 VerificationType new_class_type = cp_index_to_type(
2752 new_class_index, cp, CHECK_VERIFY(this));
2753 if (!new_class_type.equals(ref_class_type)) {
2754 verify_error(ErrorContext::bad_type(bci,
2755 TypeOrigin::cp(new_class_index, new_class_type),
2756 TypeOrigin::cp(ref_class_index, ref_class_type)),
2757 "Call to wrong <init> method");
2758 return;
2759 }
2760 // According to the VM spec, if the referent class is a superclass of the
2761 // current class, and is in a different runtime package, and the method is
2762 // protected, then the objectref must be the current class or a subclass
2763 // of the current class.
2764 VerificationType objectref_type = new_class_type;
2765 if (name_in_supers(ref_class_type.name(), current_class())) {
2766 Klass* ref_klass = load_class(ref_class_type.name(), CHECK);
2767 if (was_recursively_verified()) return;
2768 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2769 vmSymbols::object_initializer_name(),
2770 cp->signature_ref_at(bcs->get_index_u2()),
2771 Klass::find_overpass);
2772 // Do nothing if method is not found. Let resolution detect the error.
2773 if (m != NULL) {
2774 InstanceKlass* mh = m->method_holder();
2775 if (m->is_protected() && !mh->is_same_class_package(_klass)) {
2776 bool assignable = current_type().is_assignable_from(
2777 objectref_type, this, true, CHECK_VERIFY(this));
2778 if (!assignable) {
2779 verify_error(ErrorContext::bad_type(bci,
2780 TypeOrigin::cp(new_class_index, objectref_type),
2781 TypeOrigin::implicit(current_type())),
2782 "Bad access to protected <init> method");
2783 return;
2784 }
2785 }
2786 }
2787 }
2788 // Check the exception handler target stackmaps with the locals from the
2789 // incoming stackmap (before initialize_object() changes them to outgoing
2790 // state).
2791 if (in_try_block) {
2792 if (was_recursively_verified()) return;
2793 verify_exception_handler_targets(bci, *this_uninit, current_frame,
2794 stackmap_table, CHECK_VERIFY(this));
2795 }
2796 current_frame->initialize_object(type, new_class_type);
2797 } else {
2798 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2799 "Bad operand type when invoking <init>");
2800 return;
2801 }
2802 }
2803
2804 bool ClassVerifier::is_same_or_direct_interface(
2805 InstanceKlass* klass,
2806 VerificationType klass_type,
2807 VerificationType ref_class_type) {
2808 if (ref_class_type.equals(klass_type)) return true;
2809 Array<InstanceKlass*>* local_interfaces = klass->local_interfaces();
2810 if (local_interfaces != NULL) {
2811 for (int x = 0; x < local_interfaces->length(); x++) {
2812 InstanceKlass* k = local_interfaces->at(x);
2813 assert (k != NULL && k->is_interface(), "invalid interface");
2814 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2815 return true;
2816 }
2817 }
2818 }
2819 return false;
2820 }
2821
2822 void ClassVerifier::verify_invoke_instructions(
2823 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2824 bool in_try_block, bool *this_uninit,
2825 const constantPoolHandle& cp, StackMapTable* stackmap_table, TRAPS) {
2826 // Make sure the constant pool item is the right type
2827 u2 index = bcs->get_index_u2();
2828 Bytecodes::Code opcode = bcs->raw_code();
2829 unsigned int types = 0;
2830 switch (opcode) {
2831 case Bytecodes::_invokeinterface:
2832 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2833 break;
2834 case Bytecodes::_invokedynamic:
2835 types = 1 << JVM_CONSTANT_InvokeDynamic;
2836 break;
2837 case Bytecodes::_invokespecial:
2838 case Bytecodes::_invokestatic:
2839 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2840 (1 << JVM_CONSTANT_Methodref) :
2841 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2842 break;
2843 default:
2844 types = 1 << JVM_CONSTANT_Methodref;
2845 }
2846 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2847
2848 // Get method name and signature
2849 Symbol* method_name = cp->name_ref_at(index);
2850 Symbol* method_sig = cp->signature_ref_at(index);
2851
2852 // Method signature was checked in ClassFileParser.
2853 assert(SignatureVerifier::is_valid_method_signature(method_sig),
2854 "Invalid method signature");
2855
2856 // Get referenced class
2857 VerificationType ref_class_type;
2858 if (opcode == Bytecodes::_invokedynamic) {
2859 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2860 class_format_error(
2861 "invokedynamic instructions not supported by this class file version (%d), class %s",
2862 _klass->major_version(), _klass->external_name());
2863 return;
2864 }
2865 } else {
2866 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2867 }
2868
2869 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2870 "buffer type must match VerificationType size");
2871
2872 // Get the UTF8 index for this signature.
2873 int sig_index = cp->signature_ref_index_at(cp->name_and_type_ref_index_at(index));
2874
2875 // Get the signature's verification types.
2876 sig_as_verification_types* mth_sig_verif_types;
2877 sig_as_verification_types** mth_sig_verif_types_ptr = method_signatures_table()->get(sig_index);
2878 if (mth_sig_verif_types_ptr != NULL) {
2879 // Found the entry for the signature's verification types in the hash table.
2880 mth_sig_verif_types = *mth_sig_verif_types_ptr;
2881 assert(mth_sig_verif_types != NULL, "Unexpected NULL sig_as_verification_types value");
2882 } else {
2883 // Not found, add the entry to the table.
2884 GrowableArray<VerificationType>* verif_types = new GrowableArray<VerificationType>(10);
2885 mth_sig_verif_types = new sig_as_verification_types(verif_types);
2886 create_method_sig_entry(mth_sig_verif_types, sig_index, CHECK_VERIFY(this));
2887 }
2888
2889 // Get the number of arguments for this signature.
2890 int nargs = mth_sig_verif_types->num_args();
2891
2892 // Check instruction operands
2893 u2 bci = bcs->bci();
2894 if (opcode == Bytecodes::_invokeinterface) {
2895 address bcp = bcs->bcp();
2896 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2897 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2898 // the difference between the size of the operand stack before and after the instruction
2899 // executes.
2900 if (*(bcp+3) != (nargs+1)) {
2901 verify_error(ErrorContext::bad_code(bci),
2902 "Inconsistent args count operand in invokeinterface");
2903 return;
2904 }
2905 if (*(bcp+4) != 0) {
2906 verify_error(ErrorContext::bad_code(bci),
2907 "Fourth operand byte of invokeinterface must be zero");
2908 return;
2909 }
2910 }
2911
2912 if (opcode == Bytecodes::_invokedynamic) {
2913 address bcp = bcs->bcp();
2914 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2915 verify_error(ErrorContext::bad_code(bci),
2916 "Third and fourth operand bytes of invokedynamic must be zero");
2917 return;
2918 }
2919 }
2920
2921 if (method_name->char_at(0) == '<') {
2922 // Make sure <init> can only be invoked by invokespecial or invokestatic.
2923 // The allowed invocation mode of <init> depends on its signature.
2924 if ((opcode != Bytecodes::_invokespecial &&
2925 opcode != Bytecodes::_invokestatic) ||
2926 method_name != vmSymbols::object_initializer_name()) {
2927 verify_error(ErrorContext::bad_code(bci),
2928 "Illegal call to internal method");
2929 return;
2930 }
2931 } else if (opcode == Bytecodes::_invokespecial
2932 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2933 && !ref_class_type.equals(VerificationType::reference_type(
2934 current_class()->super()->name()))) { // super() can never be a value_type.
2935 bool subtype = false;
2936 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2937 if (!current_class()->is_unsafe_anonymous()) {
2938 subtype = ref_class_type.is_assignable_from(
2939 current_type(), this, false, CHECK_VERIFY(this));
2940 } else {
2941 InstanceKlass* unsafe_host = current_class()->unsafe_anonymous_host();
2942 VerificationType unsafe_anonymous_host_type = reference_or_valuetype(unsafe_host);
2943 subtype = ref_class_type.is_assignable_from(unsafe_anonymous_host_type, this, false, CHECK_VERIFY(this));
2944
2945 // If invokespecial of IMR, need to recheck for same or
2946 // direct interface relative to the host class
2947 have_imr_indirect = (have_imr_indirect &&
2948 !is_same_or_direct_interface(
2949 unsafe_host,
2950 unsafe_anonymous_host_type, ref_class_type));
2951 }
2952 if (!subtype) {
2953 verify_error(ErrorContext::bad_code(bci),
2954 "Bad invokespecial instruction: "
2955 "current class isn't assignable to reference class.");
2956 return;
2957 } else if (have_imr_indirect) {
2958 verify_error(ErrorContext::bad_code(bci),
2959 "Bad invokespecial instruction: "
2960 "interface method reference is in an indirect superinterface.");
2961 return;
2962 }
2963
2964 }
2965
2966 // Get the verification types for the method's arguments.
2967 GrowableArray<VerificationType>* sig_verif_types = mth_sig_verif_types->sig_verif_types();
2968 assert(sig_verif_types != NULL, "Missing signature's array of verification types");
2969 // Match method descriptor with operand stack
2970 // The arguments are on the stack in descending order.
2971 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2972 current_frame->pop_stack(sig_verif_types->at(i), CHECK_VERIFY(this));
2973 }
2974
2975 // Check objectref on operand stack
2976 if (opcode != Bytecodes::_invokestatic &&
2977 opcode != Bytecodes::_invokedynamic) {
2978 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2979 // (use of <init> as a static factory is handled under invokestatic)
2980 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2981 code_length, in_try_block, this_uninit, cp, stackmap_table,
2982 CHECK_VERIFY(this));
2983 if (was_recursively_verified()) return;
2984 } else { // other methods
2985 // Ensures that target class is assignable to method class.
2986 if (opcode == Bytecodes::_invokespecial) {
2987 if (!current_class()->is_unsafe_anonymous()) {
2988 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2989 } else {
2990 // anonymous class invokespecial calls: check if the
2991 // objectref is a subtype of the unsafe_anonymous_host of the current class
2992 // to allow an anonymous class to reference methods in the unsafe_anonymous_host
2993 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2994
2995 InstanceKlass* unsafe_host = current_class()->unsafe_anonymous_host();
2996 VerificationType host_type = reference_or_valuetype(unsafe_host);
2997 bool subtype = host_type.is_assignable_from(top, this, false, CHECK_VERIFY(this));
2998 if (!subtype) {
2999 verify_error( ErrorContext::bad_type(current_frame->offset(),
3000 current_frame->stack_top_ctx(),
3001 TypeOrigin::implicit(top)),
3002 "Bad type on operand stack");
3003 return;
3004 }
3005 }
3006 } else if (opcode == Bytecodes::_invokevirtual) {
3007 VerificationType stack_object_type =
3008 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
3009 if (current_type() != stack_object_type) {
3010 if (was_recursively_verified()) return;
3011 assert(cp->cache() == NULL, "not rewritten yet");
3012 Symbol* ref_class_name =
3013 cp->klass_name_at(cp->klass_ref_index_at(index));
3014 // See the comments in verify_field_instructions() for
3015 // the rationale behind this.
3016 if (name_in_supers(ref_class_name, current_class())) {
3017 Klass* ref_class = load_class(ref_class_name, CHECK);
3018 if (is_protected_access(
3019 _klass, ref_class, method_name, method_sig, true)) {
3020 // It's protected access, check if stack object is
3021 // assignable to current class.
3022 bool is_assignable = current_type().is_assignable_from(
3023 stack_object_type, this, true, CHECK_VERIFY(this));
3024 if (!is_assignable) {
3025 if (ref_class_type.name() == vmSymbols::java_lang_Object()
3026 && stack_object_type.is_array()
3027 && method_name == vmSymbols::clone_name()) {
3028 // Special case: arrays pretend to implement public Object
3029 // clone().
3030 } else {
3031 verify_error(ErrorContext::bad_type(bci,
3032 current_frame->stack_top_ctx(),
3033 TypeOrigin::implicit(current_type())),
3034 "Bad access to protected data in invokevirtual");
3035 return;
3036 }
3037 }
3038 }
3039 }
3040 }
3041 } else {
3042 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
3043 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
3044 }
3045 }
3046 }
3047 // Push the result type.
3048 int sig_verif_types_len = sig_verif_types->length();
3049 if (sig_verif_types_len > nargs) { // There's a return type
3050 if (method_name == vmSymbols::object_initializer_name() &&
3051 opcode != Bytecodes::_invokestatic) {
3052 // an <init> method must have a void return type, unless it's a static factory
3053 verify_error(ErrorContext::bad_code(bci),
3054 "Return type must be void in <init> method");
3055 return;
3056 }
3057
3058 assert(sig_verif_types_len <= nargs + 2,
3059 "Signature verification types array return type is bogus");
3060 for (int i = nargs; i < sig_verif_types_len; i++) {
3061 assert(i == nargs || sig_verif_types->at(i).is_long2() ||
3062 sig_verif_types->at(i).is_double2(), "Unexpected return verificationType");
3063 current_frame->push_stack(sig_verif_types->at(i), CHECK_VERIFY(this));
3064 }
3065 } else {
3066 // an <init> method may not have a void return type, if it's a static factory
3067 if (method_name == vmSymbols::object_initializer_name() &&
3068 opcode != Bytecodes::_invokespecial) {
3069 verify_error(ErrorContext::bad_code(bci),
3070 "Return type must be non-void in <init> static factory method");
3071 return;
3072 }
3073 }
3074 }
3075
3076 VerificationType ClassVerifier::get_newarray_type(
3077 u2 index, u2 bci, TRAPS) {
3078 const char* from_bt[] = {
3079 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
3080 };
3081 if (index < T_BOOLEAN || index > T_LONG) {
3082 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
3083 return VerificationType::bogus_type();
3084 }
3085
3086 // from_bt[index] contains the array signature which has a length of 2
3087 Symbol* sig = create_temporary_symbol(from_bt[index], 2);
3088 return VerificationType::reference_type(sig);
3089 }
3090
3091 void ClassVerifier::verify_anewarray(
3092 u2 bci, u2 index, const constantPoolHandle& cp,
3093 StackMapFrame* current_frame, TRAPS) {
3094 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
3095 current_frame->pop_stack(
3096 VerificationType::integer_type(), CHECK_VERIFY(this));
3097
3098 if (was_recursively_verified()) return;
3099 VerificationType component_type =
3100 cp_index_to_type(index, cp, CHECK_VERIFY(this));
3101 int length;
3102 char* arr_sig_str;
3103 if (component_type.is_array()) { // it's an array
3104 const char* component_name = component_type.name()->as_utf8();
3105 // Check for more than MAX_ARRAY_DIMENSIONS
3106 length = (int)strlen(component_name);
3107 if (length > MAX_ARRAY_DIMENSIONS &&
3108 component_name[MAX_ARRAY_DIMENSIONS - 1] == '[') {
3109 verify_error(ErrorContext::bad_code(bci),
3110 "Illegal anewarray instruction, array has more than 255 dimensions");
3111 }
3112 // add one dimension to component
3113 length++;
3114 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length + 1);
3115 int n = os::snprintf(arr_sig_str, length + 1, "[%s", component_name);
3116 assert(n == length, "Unexpected number of characters in string");
3117 } else { // it's an object or interface
3118 const char* component_name = component_type.name()->as_utf8();
3119 char Q_or_L = component_type.is_valuetype() ? 'Q' : 'L';
3120 // add one dimension to component with 'L' or 'Q' prepended and ';' appended.
3121 length = (int)strlen(component_name) + 3;
3122 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length + 1);
3123 int n = os::snprintf(arr_sig_str, length + 1, "[%c%s;", Q_or_L, component_name);
3124 assert(n == length, "Unexpected number of characters in string");
3125 }
3126 Symbol* arr_sig = create_temporary_symbol(arr_sig_str, length);
3127 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
3128 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
3129 }
3130
3131 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
3132 current_frame->get_local(
3133 index, VerificationType::integer_type(), CHECK_VERIFY(this));
3134 current_frame->push_stack(
3135 VerificationType::integer_type(), CHECK_VERIFY(this));
3136 }
3137
3138 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
3139 current_frame->get_local_2(
3140 index, VerificationType::long_type(),
3141 VerificationType::long2_type(), CHECK_VERIFY(this));
3142 current_frame->push_stack_2(
3143 VerificationType::long_type(),
3144 VerificationType::long2_type(), CHECK_VERIFY(this));
3145 }
3146
3147 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
3148 current_frame->get_local(
3149 index, VerificationType::float_type(), CHECK_VERIFY(this));
3150 current_frame->push_stack(
3151 VerificationType::float_type(), CHECK_VERIFY(this));
3152 }
3153
3154 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
3155 current_frame->get_local_2(
3156 index, VerificationType::double_type(),
3157 VerificationType::double2_type(), CHECK_VERIFY(this));
3158 current_frame->push_stack_2(
3159 VerificationType::double_type(),
3160 VerificationType::double2_type(), CHECK_VERIFY(this));
3161 }
3162
3163 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
3164 VerificationType type = current_frame->get_local(
3165 index, VerificationType::nonscalar_check(), CHECK_VERIFY(this));
3166 current_frame->push_stack(type, CHECK_VERIFY(this));
3167 }
3168
3169 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
3170 current_frame->pop_stack(
3171 VerificationType::integer_type(), CHECK_VERIFY(this));
3172 current_frame->set_local(
3173 index, VerificationType::integer_type(), CHECK_VERIFY(this));
3174 }
3175
3176 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
3177 current_frame->pop_stack_2(
3178 VerificationType::long2_type(),
3179 VerificationType::long_type(), CHECK_VERIFY(this));
3180 current_frame->set_local_2(
3181 index, VerificationType::long_type(),
3182 VerificationType::long2_type(), CHECK_VERIFY(this));
3183 }
3184
3185 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
3186 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
3187 current_frame->set_local(
3188 index, VerificationType::float_type(), CHECK_VERIFY(this));
3189 }
3190
3191 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
3192 current_frame->pop_stack_2(
3193 VerificationType::double2_type(),
3194 VerificationType::double_type(), CHECK_VERIFY(this));
3195 current_frame->set_local_2(
3196 index, VerificationType::double_type(),
3197 VerificationType::double2_type(), CHECK_VERIFY(this));
3198 }
3199
3200 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
3201 VerificationType type = current_frame->pop_stack(
3202 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
3203 current_frame->set_local(index, type, CHECK_VERIFY(this));
3204 }
3205
3206 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
3207 VerificationType type = current_frame->get_local(
3208 index, VerificationType::integer_type(), CHECK_VERIFY(this));
3209 current_frame->set_local(index, type, CHECK_VERIFY(this));
3210 }
3211
3212 void ClassVerifier::verify_return_value(
3213 VerificationType return_type, VerificationType type, u2 bci,
3214 StackMapFrame* current_frame, TRAPS) {
3215 if (return_type == VerificationType::bogus_type()) {
3216 verify_error(ErrorContext::bad_type(bci,
3217 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
3218 "Method expects a return value");
3219 return;
3220 }
3221 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this));
3222 if (!match) {
3223 verify_error(ErrorContext::bad_type(bci,
3224 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
3225 "Bad return type");
3226 return;
3227 }
3228 }
3229
3230 // The verifier creates symbols which are substrings of Symbols.
3231 // These are stored in the verifier until the end of verification so that
3232 // they can be reference counted.
3233 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
3234 int end) {
3235 const char* name = (const char*)s->base() + begin;
3236 int length = end - begin;
3237 return create_temporary_symbol(name, length);
3238 }
3239
3240 Symbol* ClassVerifier::create_temporary_symbol(const char *name, int length) {
3241 // Quick deduplication check
3242 if (_previous_symbol != NULL && _previous_symbol->equals(name, length)) {
3243 return _previous_symbol;
3244 }
3245 Symbol* sym = SymbolTable::new_symbol(name, length);
3246 if (!sym->is_permanent()) {
3247 if (_symbols == NULL) {
3248 _symbols = new GrowableArray<Symbol*>(50, 0, NULL);
3249 }
3250 _symbols->push(sym);
3251 }
3252 _previous_symbol = sym;
3253 return sym;
3254 }