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