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